Tower disassembly method, clamp jig, end closing jig, and temporary fixing jig

Abstract

To provide a tower dismantling method capable of easily and safely separating and removing an upper segment from a lower segment, and a clamping jig, an end closing jig, and a temporary fixing jig for use in tower dismantling.SOLUTION: In clamping jig installation step K21, flange portions 16a(2), 18a(2) of an upper main pillar material 16(2) and a lower main pillar material 18(2) are clamped together by a clamp jig 62. In post pin installation step K23 after the clamping jig installation step K21, a vertical bolt 30 is removed to release the bolt fastening of the upper main pillar material 16(2) and the lower main pillar material 18(2). After the vertical bolt 30 is removed, a post pin 100 is inserted from above into bolt holes 20(2), 22(2) which are now connected in the vertical direction. A pin portion 100a is made to protrude below the bolt hole 22(2) and an engaging portion 100b is supported on the upper peripheral portion of the bolt hole 20(2). In lifting and removal step K33 following clamp jig removal step K26 and lifting wire connection step K31, an upper segment 12 is lifted by lifting means 36 and removed.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present invention relates to a tower dismantling method for dismantling a transmission tower using a lifting means such as a helicopter or a crane, a clamp jig for tower dismantling, an end closing jig, and a temporary fixing jig.

Background Art

[0002] As one of the tower dismantling methods, there is a method of separating a specific part of the tower (hereinafter referred to as the upper segment) from the other part (hereinafter referred to as the lower segment), lifting the upper segment, and transferring it to another place.

[0003] In a general tower, bolt holes are provided at the ends of the upper main column member, which is a component of the upper segment, and the lower main column member, which is a component of the lower segment. The bolt holes are communicated with each other, bolts are passed through, and the ends are bolted together to be connected. Therefore, the operation of separating the upper segment from the lower segment is performed in the following procedure: first, the bolt fixing is released with a temporary fixing means attached to the bolted end, then the temporary fixing by the temporary fixing means is released, and it is lifted and separated by a lifting means.

[0004] Note that the upper segment is often located above the lower segment, but may also be located beside the lower segment. Therefore, the notations "upper" and "lower" do not strictly represent their positional relationship with each other.

[0005] Conventionally, a plurality of working procedures and temporary fixing means for smoothly separating the upper segment from the lower segment have been proposed. For example, in the tower dismantling method disclosed in Patent Document 1, a support member and a connecting jig are prepared as temporary fixing means (see FIGS. 6 to 10 of Patent Document 1). First, the support member is attached to the upper end portion of the lower main column member so as to support the lower end portion of the upper main column member. The bolt is pulled out from the communicating bolt holes to release the bolt fixing. The shaft member of the connecting jig is inserted into the bolt holes, and a retaining pin is attached to the tip of the shaft member to make it in a temporarily fixed state. Then, when releasing the temporary fixing by the connecting jig, an operation of removing the retaining pin from the shaft member is performed. When the retaining pin is removed, the biasing force of the coil spring built into the connecting jig acts on the shaft member, and the shaft member automatically comes out of the bolt hole, releasing the temporary fixing by the connecting jig. Then, the upper segment is lifted by a lifting means and separated from the lower segment.

[0006] The tower dismantling method disclosed in Patent Document 2 is a method when the upper and lower main column members are L-shaped steel materials. A receiving fitting and a temporary clamping device are prepared as temporary fixing means (see FIGS. 5, 6, and 8 of Patent Document 2). First, the receiving fitting is attached to the upper end portion of the lower main column member so as to support the lower end portion of the upper main column member. The bolt is pulled out from the communicating bolt holes to release the bolt fixing. The stoppers of the upper main column member and the receiving fitting are clamped with a temporary clamping device (so-called C-shaped clamp) to make it in a temporarily fixed state. Then, when releasing the temporary fixing by the temporary clamping device, an operation of rotating the operation lever of the temporary clamping device is performed, and the temporary fixing is released by gradually loosening the clamping. Then, the upper segment is lifted by a lifting means and separated from the lower segment.

Prior Art Documents

Patent Documents

[0007]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0008] In the tower dismantling method of Patent Document 1, when releasing the temporary fixing by the connecting jig, the shaft member inserted into the two bolt holes is pulled out by applying the biasing force of the coil spring to the shaft member. However, considering the workability when attaching the connecting jig, the biasing force of the coil spring cannot be made too strong. Therefore, when unlocking the temporary fixing by the connecting jig, the shaft member may not be smoothly removed, and improvement has been demanded.

[0009] In the case of the tower dismantling method of Patent Document 2, it is a condition that the main column member is an L-shaped steel material. Therefore, the temporary fixing means (receiving bracket, temporary clamping clamp) described in the drawings of Patent Document 2 has a structure premised on the main column member being an L-shaped steel material, and it is difficult to use for main column members other than L-shaped steel materials. Also, when releasing the temporary fixing by the temporary clamping clamp, the operating lever of the temporary clamping clamp has to be rotated many times, which is a burden on the worker working at height.

[0010] In recent years, the case of using steel pipe materials as main column members has been increasing. A steel pipe material is one in which an outward flange portion is integrally formed at the open end of a cylindrical main body portion made of steel material. Also, in order to further improve the strength and durability of the tower, a concrete-filled steel pipe material in which concrete is filled inside the cylindrical main body portion of the steel pipe material may be used. The towers described in Patent Documents 1 and 2 do not use steel pipe materials as main column members.

[0011] When the upper main column member and the lower main column member are concrete-filled steel pipes, they are connected by fixing the flange portions at the ends to face each other and fixing them to each other. Therefore, if the fixing between the flange portions is simply released and the upper main column member is separated from the lower main column member, there is a risk that fragments of the concrete in the upper main column member may fall off and drop to the ground during transportation, and it becomes an issue to ensure safety by some means. However, effective and highly practical solutions have not yet been developed, and no effective solutions are described in Patent Documents 1 and 2 either.

[0012] The present invention has been made in view of the above background art, and an object thereof is to provide a method for disassembling a steel tower that can be disassembled by using a lifting means such as a helicopter or a crane, which can easily and safely separate and remove the upper segment from the lower segment, and various jigs suitable therefor.

Means for Solving the Problems

[0013] This invention is a method for disassembling a steel tower having an upper segment and a lower segment, in which bolt holes are respectively provided at the ends of an upper main column member that is a constituent member of the upper segment and a lower main column member that is a constituent member of the lower segment, the bolt holes of each other are communicated in the vertical direction, a vertical bolt is passed through, and the upper segment and the lower segment are connected by bolt-fixing the ends of the upper main column member and the lower main column member to each other, and the method for disassembling the steel tower is to disassemble the steel tower by separating the upper segment from the lower segment, A clamp jig preparation step of preparing a detachable clamp jig that clamps an object with two clamping surfaces; A clamp jig mounting step of clamping the ends of the upper main column member and the lower main column member with the clamp jig; After the clamp jig mounting step, by removing the vertical bolt, the bolt fixing of the upper main column member and the lower main column member is released, and the upper main column member and the lower main column member are temporarily fixed with the clamp jig, and Insert a post pin having a pin portion thick enough to pass through the bolt hole and a locking portion sized such that it cannot pass through the bolt hole into the bolt hole that is vertically communicating with the vertical bolt removed from above, project the pin portion below the bolt hole, and support the locking portion on the peripheral edge above the bolt hole. Or, a post pin mounting step of inserting a post pin having a pin portion thick enough to pass through the bolt hole into the bolt hole that is vertically communicating with the vertical bolt removed from above, projecting the pin portion above the bolt hole, and fixing the base end portion located below the bolt hole to the lower main column member. After the post pin mounting step, a clamp jig removal step of removing the clamp jig and releasing the temporary fixing between the ends of the upper main column member and the lower main column member. A suspension wire connection step of connecting a suspension wire provided on the lifting means to the upper segment. A tower dismantling method including a lifting and removing step of lifting and removing the upper segment with the lifting means after the clamp jig removal step and the suspension wire connection step.

[0014] It is preferable to have a configuration in which a weight confirmation step of slightly lifting the upper segment with the lifting means to confirm the weight of the upper segment is performed after the clamp jig removal step and the suspension wire connection step and before the lifting and removing step.

[0015] When the weight confirmation step is performed, when the ends of the upper main column member and the lower main column member are bolt-fixed to each other using a plurality of the bolt holes. A C-shaped fitting preparation step of preparing a C-shaped fitting having a vertical member and first and second horizontal members extending laterally from both ends thereof and facing each other, and a pair of first and second through holes communicating with each other formed at the tip ends of the first and second horizontal members, a pin member inserted into the first and second through holes with a clearance, and a positioning member detachably attached to the upper end portion of the pin member, wherein the upper end portion of the pin member protrudes upward from the first through hole, the lower end portion of the pin member protrudes downward from the second through hole, and the positioning member is attached to the upper end portion of the pin member so that the pin member is positioned with respect to the C-shaped body member. A step performed in parallel with the post pin mounting step, in which the ends of the upper main column member and the lower main column member are arranged between the first horizontal member and the second horizontal member of the C-shaped body member, the bolt hole from which the vertical bolt has been removed is communicated with the first and second through holes, the pin member is inserted, the positioning member is attached to the upper end portion of the pin member to bring the C-shaped fitting into an assembled state, and the C-shaped fitting defines the maximum value of the separable distance between the ends of the upper main column member and the lower main column member. C-shaped fitting mounting step. It is preferable to perform a C-shaped fitting removal step, which is a step performed after the weight confirmation step and before the lifting and removal step, in which the positioning member is removed from the pin member to separate the pin member and the C-shaped body member, and the C-shaped fitting is removed from the ends of the upper main column member and the lower main column member.

[0016] The upper main column member and the lower main column member may be members in which an outward flange portion is integrally formed at the open end of the cylindrical main body portion, and the bolt holes are formed in the flange portions serving as the ends of the upper main column member and the lower main column member. Further, the upper main column member and the lower main column member may be steel pipe members filled with a reinforcing filler inside the cylindrical main body portion.

[0017] In that case, a base body detachable from the upper main column member, a plate-shaped shutter formed to have a size capable of closing the open end of the upper main column member, a shutter support mechanism attached to the base body for pivotally supporting an end portion of the shutter and enabling the shutter to move from a position closing the open end to an open position, and a biasing means attached to the base body for biasing the shutter toward a position closing the open end, and an end closing jig preparation step of preparing an end closing jig having these components. Before performing the clamp jig removal step, it is preferable to perform an end closing jig mounting step of fixing the base body of the end closing jig to the upper main column member, moving the shutter to a position opening the open end against the biasing force of the biasing means, and locking the end portion of the shutter to the outer peripheral surface of the flange portion of the lower main column member.

[0018] The present invention also relates to a clamp jig used when disassembling a steel tower in which an upper segment and a lower segment are connected by providing bolt holes at the ends of an upper main column member which is a constituent member of the upper segment and a lower main column member which is a constituent member of the lower segment, respectively, passing a bolt through the bolt holes in communication with each other, and bolt-fixing the ends of the upper main column member and the lower main column member to each other. The clamp jig includes a movable member, a fixed member, a first link member, and a second link member. The movable member is composed of a movable clamp portion having a movable clamping surface formed on the positive Z-axis side and a long rod portion extending in the positive Z-axis direction from a side end portion of the movable clamp portion. A first shaft mounting portion is disposed at the end portion of the rod portion on the positive Z-axis side. The fixed member includes a fixed clamp portion having a fixed clamping surface formed at a position on the negative Z-axis side facing the movable clamping surface, a main body portion having a predetermined length extending in the positive Z-axis direction from the surface of the fixed clamp portion opposite to the fixed clamping surface, and a guide hole located laterally of the fixed clamp portion or the main body portion and penetrating in the Z-axis direction. The rod portion is inserted into the guide hole, and the rod portion is slidably supported in the positive and negative Z-axis directions by a rod guide portion. A second shaft mounting portion is disposed at a position extending the axis of the rod portion or in the vicinity thereof at the end of the main body portion on the positive Z-axis side. The first link member includes a link main body portion having one end rotatably connected to the first shaft mounting portion, and an operation lever extending from the other end of the link main body portion. One end of the second link member is rotatably connected to the second shaft mounting portion, and the other end is of rotatably connected to a third shaft mounting portion disposed at a position closer to the operation lever than the second shaft mounting portion of the first link member. When the operation lever is operated to tilt the link main body portion in a direction intersecting the Z-axis, the second link member and the movable member are displaced, and the movable clamping surface moves in the negative Z-axis direction, and the end portions of the bolt-fixed upper main column member and the lower main column member are disposed between the fixed clamping surface and the movable clamping surface. When the operation lever is operated to lift the link main body portion in the positive Z-axis direction, the second link member and the movable member are displaced, and the movable clamping surface moves in the positive Z-axis direction. When the third shaft mounting portion reaches a position extending the axis of the rod portion or in the vicinity thereof, the second link member is locked to the component of the second shaft mounting portion, and the position of the movable clamping surface relative to the fixed clamping surface is fixed. When the operation lever is operated to tilt the link main body portion in a direction intersecting the Z-axis, the fixing of the position of the movable clamping surface is released. It is a clamp jig.

[0019] In the movable clamp portion, an adjustment bolt is provided such that a threaded portion is arranged in the positive Z-axis direction and the tip surface of the threaded portion serves as the movable clamping surface. It is preferable to configure it such that the position of the movable clamping surface in the Z-axis direction can be variably adjusted by rotating the adjustment bolt. Further, it is preferable that a remote operation tool is provided for operating at a location away from the operation lever when releasing the clamped state. Furthermore, it is preferable that a fall prevention connector for connecting a specific part to the lower segment is provided.

[0020] Further, the present invention relates to a steel tower in which an upper segment and a lower segment are connected by fixing an upper main column member, which is a constituent member of the upper segment, and a lower main column member, which is a constituent member of the lower segment, to each other. The upper main column member and the lower main column member are steel pipes filled with a filler for reinforcement inside a cylindrical main body portion, with an outward flange portion integrally formed at the open end of the cylindrical main body portion. The steel tower in which the upper segment and the lower segment are connected by facing the flange portions and fixing them to each other is a steel tower dismantling method for dismantling by separating the upper segment from the lower segment, and an end closing jig preparation step of preparing an end closing jig including a base detachably attached to the upper main column member, a plate-shaped shutter formed to be able to close the open end of the upper main column member, a shutter support mechanism attached to the base for pivotally supporting an end of the shutter and enabling the shutter to move from a position closing the open end to an open position, and a biasing means attached to the base for biasing the shutter toward a position closing the open end; an end closing jig mounting step of fixing the base of the end closing jig to the upper main column member, moving the shutter to a position opening the open end against the biasing force of the biasing means, and locking an end of the shutter to an outer peripheral surface of the flange portion of the lower main column member; a suspension wire connection step of connecting a suspension wire provided on a lifting means to the upper segment; After the wire hanging connection step, a fixing release step of releasing the fixing between the flange portions of the upper main column member and the lower main column member; A tower dismantling method comprising, after the end closing jig mounting step and the fixing release step, a lifting and removing step of lifting and removing the upper segment by the lifting means.

[0021] Further, the present invention relates to a tower in which an upper main column member, which is a constituent member of an upper segment, and a lower main column member, which is a constituent member of a lower segment, are fixed to each other, and the upper segment and the lower segment are connected. The upper main column member and the lower main column member are steel pipes filled with a filler for reinforcement inside a cylindrical main body portion, with an outward flange portion integrally formed at the open end of the cylindrical main body portion. An end closing jig used when dismantling the tower in which the upper segment and the lower segment are connected by facing and fixing the flange portions to each other by separating the upper segment from the lower segment, It includes a base detachably attached to the upper main column member, a plate-shaped shutter formed to be able to close the open end of the upper main column member, a shutter support mechanism attached to the base for pivotally supporting the end of the shutter and enabling the shutter to move from a position closing the open end to an open position, and a biasing means attached to the base for biasing the shutter toward a position closing the open end. When mounted on the tower before dismantling, the base is fixed to the upper main column member, the shutter is moved to a position opening the open end against the biasing of the biasing means, and the end of the shutter is locked to the outer peripheral surface of the flange portion of the lower main column member for mounting. When the upper segment is separated from the lower segment, the locking of the end of the shutter is released, and by the biasing of the biasing means, it is an end closing jig that automatically moves to a position closing the open end of the upper main column member.

[0022] The shutter support mechanism may be configured to include a stopper member that holds the shutter, which has been moved by being biased by the biasing means after the upper segment is separated from the lower segment, at a position closing the opening end of the upper main pillar member.

[0023] Further, the present invention relates to a tower dismantling method for dismantling a tower in which an upper segment and a lower segment are connected by bolt-fixing the ends of an upper main pillar member, which is a component of the upper segment, and a lower main pillar member, which is a component of the lower segment, by providing a plurality of bolt holes at the ends of the upper main pillar member and the lower main pillar member, respectively, and passing a horizontal bolt through the corresponding bolt holes in the lateral direction. The method includes separating the upper segment from the lower segment, and the method comprises: a temporary fixing jig preparation step of preparing a temporary fixing jig including a main body member having first and second side surfaces that intersect and are continuous with each other, and a movable pin having a predetermined length attached to the main body member, the base end portion of which is pivotally supported near the first side surface of the main body member so as to be swingable, and the insertion portion on the side opposite to the base end portion being displaceable in a state of protruding outward from the first side surface; a temporary fixing jig mounting step of removing the horizontal bolt, inserting the insertion portion of the movable pin of the temporary fixing jig into the bolt hole that is laterally communicated after the horizontal bolt is removed, bringing the first side surface of the main body member into contact with the peripheral portion of the bolt hole, and temporarily fixing the upper main pillar member and the lower main pillar member with the temporary fixing jig; a suspension wire connection step of connecting a suspension wire provided on a lifting means to the upper segment; a temporary fixing jig removal step of, after the temporary fixing jig mounting step, pulling a specific portion of the main body member of the temporary fixing jig, and obliquely separating the first side surface from the peripheral portion of the bolt hole with a corner where the first and second side surfaces intersect as a fulcrum, thereby pulling out the insertion portion of the movable pin from the bolt hole and releasing the temporary fixing of the upper main pillar member to the lower main pillar member; A method for disassembling a steel tower, comprising a lifting and removing step of lifting and removing the upper segment by the lifting means after the hanging wire connection step and the step of removing the temporary fixing jig.

[0024] After the hanging wire connection step, the upper main column member and the lower main column member are temporarily fixed by the temporary fixing jig, and the upper segment is rotatable about the movable pin of the temporary fixing jig. It is preferable to adopt a configuration in which a weight confirmation step is performed by slightly lifting the upper segment with the lifting means to confirm the weight of the upper segment.

[0025] Before the temporary fixing jig mounting step or in a step performed in parallel with the temporary fixing jig mounting step, before removing the horizontal bolt, a wedge member for preventing misalignment between the bolt holes of the upper main column member and the lower main column member is provided at the gap between the end of the upper main column member and the end of the lower main column member. It may be configured to perform a wedge member mounting step of mounting a wedge member.

[0026] Further, the present invention has an upper segment and a lower segment, and a plurality of bolt holes are provided at the end of the upper main column member which is a component of the upper segment and the end of the lower main column member which is a component of the lower segment respectively. A temporary fixing jig used when disassembling a steel tower in which the upper segment and the lower segment are connected by passing a horizontal bolt through the bolt holes in the horizontal direction and bolt-fixing the ends of the upper main column member and the lower main column member together to separate the upper segment from the lower segment, A main body member having first and second side surfaces that intersect and are continuous with each other, and a pin of a predetermined length attached to the main body member, the base end portion of which is pivotally supported near the first side surface of the main body member so as to be swingable, and the insertion portion on the side opposite to the base end portion is displaceable in a state of protruding outward from the first side surface. It is provided with a movable pin. Remove the horizontal bolt, insert the insertion part of the movable pin into the bolt hole that is horizontally communicated after the removal of the horizontal bolt, and bring the first side surface of the main body member into contact with the peripheral part of one of the bolt holes, so that the upper main column member and the lower main column member are in a temporarily fixed state. In this temporarily fixed state, perform an operation of pulling a specific part of the main body member, and obliquely separate the first side surface from the peripheral part of the bolt hole with the corner where the first and second side surfaces intersect as a fulcrum, so that the insertion part of the movable pin is pulled out of the bolt hole, and the temporary fixing of the upper main column member and the lower main column member is released. It is a temporary fixing jig.

[0027] It is preferable that the movable pin is pivotally supported so as to be swingable with respect to the main body member and is supported in a swivel type that can rotate around its own central axis. Further, it is preferable that the main body member is provided with a magnet that attracts or adsorbs the peripheral part of the bolt hole in a state of being in contact with the peripheral part of the bolt hole and prevents the main body member from rotating around the central axis of the movable pin.

[0028] In addition, the present invention is a tower disassembling method for disassembling a tower in which an upper segment and a lower segment are connected by fixing an upper main column member, which is a component of the upper segment, and a lower main column member, which is a component of the lower segment, to each other. The upper main column member and the lower main column member are members in which an outward flange portion is integrally formed at the open end of a cylindrical main body portion, bolt holes are respectively provided in the flange portions, the bolt holes of each other are horizontally communicated, a horizontal bolt is passed through, and the flange portions are bolt-fixed to connect the upper segment and the lower segment. A guide wire having an annular portion at its tip, a pulling device for pulling the guide wire, a main body portion fixed to the upper main column member, and on one side surface of the main body portion, two locking plates facing each other are erected, and insertion holes are provided inside the two locking plates and communicate with each other. A Y-shaped fitting, a wire locking pin member having a base portion sized such that it cannot pass through the insertion hole of the locking plate and a locking pin portion sized such that it can pass through, and a locking pin retaining member detachable from the tip portion of the locking pin portion. A guide wire device preparation step of preparing a guide wire device provided with the above, Fix the main body portion of the Y-shaped fitting to the upper main column member, and with the annular portion of the guide wire disposed between the two locking plates, pass the locking pin portion of the wire locking pin member through the insertion hole of one of the locking plates, the annular portion of the guide wire, and the insertion hole of the other locking plate in sequence, and attach the locking pin retaining member to the tip portion of the locking pin portion protruding from the insertion hole of the other locking plate to connect the guide wire to the Y-shaped fitting. At the same time, attach the pulling device to the lower main column member, operate the pulling device to pull the guide wire, and bias the flange portion of the upper main column member in a direction in which it is pressed against the flange portion of the lower main column member. A guide wire device installation step, A clamp jig preparation step of preparing a detachable clamp jig for clamping an object with two clamping surfaces, A clamp jig mounting step of clamping the flange portions of the upper main column member and the lower main column member with the clamp jig, After the guide wire device installation step and the clamp jig mounting step, remove the horizontal bolt and further remove the clamp jig to make the upper main column member and the lower main column member temporarily fixed by the guide wire device. A clamp jig removal step, A suspension wire connection step of connecting a suspension wire provided on a lifting means to the upper segment, After the clamp jig removal step and the suspension wire connection step, the flange portions of the upper main column member and the lower main column member are positioned by the biasing of the guide wire device, and with the upper segment being rotatable about the axis of the position of the flange portion, a weight confirmation step of slightly lifting the upper segment with the lifting means to confirm the weight of the upper segment; After the weight confirmation step, a guide wire removal step of removing the locking pin retaining member of the guide wire device and pulling out the locking pin portion of the wire locking pin member from the Y-shaped fitting to disengage the guide wire from the Y-shaped fitting; A tower dismantling method that performs a lifting and removal step of lifting and removing the upper segment with the lifting means after the guide wire removal step.

[0029] The upper main column member and the lower main column member may be steel pipe members filled with a filler for reinforcement inside the cylindrical main body portion.

[0030] In this case, an end closing jig preparation step of preparing an end closing jig including a base body detachable from the upper main column member, a plate-shaped shutter formed to be able to close the open end of the upper main column member, a shutter support mechanism attached to the base body to pivotally support an end of the shutter and enable the shutter to move from a position closing the open end to an open position, and a biasing means attached to the base body to bias the shutter toward a position closing the open end; Before performing the clamp jig removal step, it is preferable to perform an end closing jig mounting step of fixing the base body of the end closing jig to the upper main column member, moving the shutter to a position opening the open end against the biasing of the biasing means, and locking an end of the shutter to an outer peripheral surface of the flange portion of the lower main column member.

Advantages of the Invention

[0031] Due to its unique structure, the clamping jig of the present invention can firmly clamp the ends of the upper and lower main column members with a strong force. In addition, the temporary fixing by the clamping jig can be easily released by swinging the operation lever, so it can reduce the burden on the workers working at heights, and it is also possible to remotely operate the operation lever in a safe place.

[0032] Among the methods for disassembling the iron tower of the present invention, the disassembling method using the clamping jig and the post pin is unique and has extremely high safety when lifting the upper segment by a helicopter or the like. In addition, this disassembling method has high versatility and can also be applied when the main column members other than the L-shaped steel materials of the upper segment and the lower segment are bolt-fixed in the vertical direction. In particular, it is a suitable method when the flange portions of the steel pipe materials (including the steel pipe materials filled with a filler such as concrete) in which the outward flange portions are integrally formed at the open ends of the cylindrical main body portions are bolt-fixed in the vertical direction.

[0033] Among the methods for disassembling the iron tower of the present invention, the disassembling method using the end closing jig is unique and can effectively prevent the filler from falling off from the upper main column member made of the steel pipe material filled with the filler, and can ensure the safety of the operation. Moreover, the end closing jig has a very simple structure and is easy to install on-site.

[0034] The temporary fixing jig of the present invention is a jig with a unique structure using the principle of a lever. After removing the horizontal bolt that fixes the upper main column member and the lower main column member, inserting a movable pin into the bolt holes that are removed and communicated for temporary fixing, when releasing the temporary fixing, the movable pin can be smoothly pulled out with a very simple operation, so it can reduce the burden on the workers working at heights. In addition, the temporary fixing jig of the present invention has a simple structure, can be manufactured at low cost, and has very high versatility.

[0035] Among the tower dismantling methods of the present invention, the dismantling method using the temporary fixing jig can efficiently and safely perform the tower dismantling work by using the above-mentioned temporary fixing jig with excellent performance.

[0036] Among the tower dismantling methods of the present invention, the dismantling method using the guide wire device is a suitable and unique method when two steel pipe materials are bolted horizontally, and can efficiently and safely perform the tower dismantling work.

Brief Description of the Drawings

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Embodiments for Carrying Out the Invention

[0038] <<<The First Embodiment of the Present Invention>>> Hereinafter, a first embodiment of the tower disassembly method of the present invention, an embodiment of a clamp jig, an end closing jig, and a temporary fixing jig will be described with reference to Figs. 1 to 17. Fig. 1(a) shows the state of the tower 10 before disassembly. In the tower disassembly method of this embodiment, as shown in Fig. 1(b), a specific part (upper segment 12) of the tower 10 is separated from other parts (lower segment 14), and is lifted and transferred by a lifting means 36 such as a helicopter. The lifting means 36 includes a lifting device such as a crane in addition to a helicopter.

[0039] First, the state of the tower 10 before disassembly, particularly the structure of the connection part between the upper segment 12 and the lower segment 14, will be described. As shown in Fig. 2, the upper segment 12 has upper main column members 16(1) and 16(2) made of long steel materials, and the lower segment 14 has lower main column members 18(1) and 18(2) made of long steel materials. The upper main column member 16(1) is connected to the lower main column member 18(1), and the upper main column member 16(2) is connected to the lower main column member 18(2).

[0040] As shown in Figs. 3(a) and 3(b), the upper main column member 16(1) has, at one end on the lower side, an end portion 16a(1) composed of two steel plates extending downward substantially in parallel, and a plurality of bolt holes 20(1) are formed through the central portion of the end portion 16a(1). The lower main column member 18(1) has, at a position in the middle of the upper surface, an end portion 18a(1) composed of one steel plate extending upward, and a plurality of bolt holes 22(1) are formed through it. Then, the end portion 18a(1) is disposed between the end portions 16a(1), the bolt holes 20(1) and the bolt holes 22(1) are communicated in the horizontal direction, a horizontal bolt 24 is passed through, a horizontal nut 26 is tightened at the tip of the horizontal bolt 24, and the end portions 16a(1) and 18a(1) are bolt-fixed by the horizontal bolt 24 and the horizontal nut 26. Since a play is required when adjusting the positions of the bolt holes 20(1) and 20(1) of the end portions 16a(1) and 18a(1), a certain gap 28 is formed between the root portion of the end portion 16a(1) and the tip portion of the end portion 18a(1) in the bolt-fixed state.

[0041] For the upper main column member 16(2) and the lower main column member 18(2), steel pipes filled with a filler having high strength and durability are used. The steel pipes filled with a filler are formed by integrally forming outward flanges 16a(2) and 18a(2) at the open ends of cylindrical main body portions 16b(2) and 18b(2) made of steel, and filling a reinforcing filler such as concrete (16c(2) and 18c(2)) inside the cylindrical main body portions 16b(2) and 18b(2).

[0042] As shown in Figs. 4(a) and 4(b), a plurality of bolt holes 20(2) are formed through the flange portion 16a(2) which is the end portion of the upper main column member 16(2), and a plurality of bolt holes 22(2) are also formed through the flange portion 18a(2) which is the end portion of the lower main column member 18(2). Then, the lower surface of the flange portion 16a(2) is brought into contact with the upper surface of the flange portion 18a(2), the bolt holes 20(2) and the bolt holes 22(2) are communicated in the vertical direction, a vertical bolt 30 is passed through, a vertical nut 32 is tightened at the tip of the vertical bolt 30, and the flange portions 16a(2) and 18a(2) are bolt-fixed by the vertical bolt 30 and the vertical nut 32.

[0043] In Fig. 2 (front view of the tower 10), it appears that the upper segment 12 and the lower segment 14 are connected at two locations, namely part A and part B. However, in reality, another set of upper main column members 16(1), 16(2) and lower main column members 18(1), 18(2) are provided so as to overlap on the back side of the paper surface, and the upper segment 12 and the lower segment 14 are connected at a total of four locations.

[0044] Also, Fig. 2 is an enlarged drawing of a specific part of the tower 10 shown in Fig. 1(a). Although the receiving wire 34 is attached to the upper segment 12, the receiving wire 34 is not attached to a normal tower (a tower in operation with no planned dismantling). As will be described in detail later, the receiving wire 34 is a wire for connecting the hook 36b of the suspension wire 36a lowered from a lifting means 36 such as a helicopter, and will be attached in the suspension wire connection step K31 in the flowchart shown in Fig. 5.

[0045] Next, a first embodiment of the tower dismantling method of this embodiment will be described based on the flowchart of Fig. 5. Among the steps shown in Fig. 5, steps K11 to K14 are operations related to part A, which is the connection part of the upper main column member 16(1) and the lower main column member 18(1), and steps K21 to K26 are operations related to part B, which is the connection part of the upper main column member 16(2) and the lower main column member 18(2). The other steps K31 to K33 are operations related to the lifting of the upper segment 12. The content of each step will be described in order below.

[0046] <Temporary fixing jig preparation step K11> In the temporary fixing jig preparation step K11, in order to safely separate part A, a temporary fixing jig 38, which is an embodiment of the temporary fixing jig of the present invention, is prepared. As shown in FIG. 6, the temporary fixing jig 38 includes a main body member 40 having a substantially V-shaped outer shape. The main body member 40 is composed of two V-shaped plates 42 formed in the same outer shape with each other, three spacers 44 for opposing the two V-shaped plates 42 at a predetermined interval, and three sets of screw members 46 for integrally assembling these members. The main body member 40 includes first and second side surfaces 40b and 40c that intersect at a corner portion 40a and are continuous with each other (the side end surfaces of the V-shaped plates 42 become the first and second side surfaces 40b and 40c).

[0047] A movable pin 48 having a predetermined length is attached to the main body member 40. The movable pin 48 is swingably supported by a shaft member 50 whose base end portion is disposed in the vicinity of the first side surface 40b of the main body member 40, and an insertion portion 48a on the side opposite to the base end portion is displaceable in a state of protruding outward from the first side surface 40b.

[0048] In addition, the temporary fixing jig 38 is provided with a retaining pin 52 (retaining member) that is detachable from the tip portion of the insertion portion 48a of the movable pin 48. As shown in FIG. 7, the retaining pin 52 is a pin that can be inserted into a through hole 48b that penetrates the tip portion of the insertion portion 48a in the diameter direction. In addition to the retaining pin 52, there are provided a pulling tool 56 such as a string member for pulling out the retaining pin 52 at a location away from the retaining pin 52, a pulling tool 58 such as a string member for remotely operating the main body member 40, and a fall prevention connecting tool 60 such as a string member for connecting the main body member 40 to the lower segment 14. The usage and operation of the temporary fixing jig 38 will be described in the description of subsequent steps.

[0049] <Temporary fixing jig mounting step K12 / Wedge member mounting step K13> In the temporary fixing jig mounting step K12, one of the plurality of horizontal bolts 24 shown in FIG. 3(a) (for example, the uppermost horizontal bolt 24 in FIG. 3(b)) is removed, and as shown in FIG. 7, the insertion portion 48a of the movable pin 48 of the temporary fixing jig 38 is deeply inserted into the bolt holes 20(1) and 22(1) that are horizontally communicated with each other after the horizontal bolt 24 is removed. Then, the first side surface 40b of the main body member 40 is brought into contact with the peripheral portions of the bolt holes 20(1) and 22(1), a retaining pin 52 is inserted into the through hole 48b at the tip portion of the insertion portion 48a to prevent the insertion portion 48a from coming off, and then all the remaining horizontal bolts 24 are removed. In this way, the upper main column member 16(1) and the lower main column member 18(1) are temporarily fixed by the temporary fixing jig 38. Then, the fall prevention connector 60 is connected to an appropriate position of the lower segment 14, and the temporary fixing jig mounting step K12 is completed.

[0050] The wedge member mounting step K13 is a step of preparing a wedge member 54 of a predetermined size and inserting it into the gap 28 between the end portion 16a(1) of the upper main column member 16(1) and the end portion 18a(1) of the lower main column member 18(1) as shown in FIG. 7. As a result, the upper main column member 16(1) is supported by the lower main column member 18(1) via the wedge member 54, and it is possible to prevent the positions of the bolt holes 20(1) and 22(1) from shifting. If the temporary fixing jig mounting step K12 is performed according to the above procedure, the wedge member mounting step K13 may be performed at an appropriate timing during the temporary fixing jig mounting step K12, before all the remaining horizontal bolts 24 are removed, but it may also be performed before the temporary fixing jig mounting step K12.

[0051] <Clamp jig preparation step K21> In the clamp jig preparation step K21, in order to safely separate the B part, a clamp jig 62 which is an embodiment of the clamp jig of the present invention is prepared. The clamp jig 62 is a detachable jig that clamps an object between two clamping surfaces, and as shown in FIG. 8, it is composed of a movable member 64, a fixed member 66, a first link member 68, and a second link member 70, and these are integrally assembled using a screw member or the like.

[0052] The movable member 64 is composed of a movable clamp portion 72 having a movable clamping surface 72a formed at the end on the positive Z-axis direction side, which is the direction of the arrow shown in FIGS. 9(a) to (e), and a long rod portion 74 extending in the positive Z-axis direction from the side end of the movable clamp portion 72. A shaft hole 74a is formed through the end of the rod portion 74 on the positive Z-axis direction side. Further, the movable clamp portion 72 is provided with an adjustment bolt 76 for finely adjusting the position of the movable clamping surface 72a in the Z-axis direction. The adjustment bolt 76 has a threaded portion 76a supported so as to be movable in the Z-axis direction, and the tip portion of the threaded portion 76a protrudes from the upper surface of the movable clamp portion 72, and the end surface of this tip portion serves as the movable clamping surface 72a. Therefore, by operating the adjustment bolt 76, the position of the movable clamping surface 72a in the Z-axis direction can be adjusted. This adjustment bolt 76 can be eliminated if not necessary, and in that case, the upper surface of the movable clamp portion 72 serves as the movable clamping surface 72a.

[0053] The fixed member 66 is composed of a fixed clamp portion 78 having a fixed clamping surface 78a formed at the end on the negative Z-axis direction side, which is the opposite direction of the arrow shown in FIGS. 10(a) to (e), a main body portion 80 composed of two plate-like members of a predetermined length extending in the positive Z-axis direction from the surface of the fixed clamp portion 78 opposite to the fixed clamping surface 78a, and a rod guide portion 82 having a guide hole 82a penetrating in the Z-axis direction and located at the side end of the fixed clamp portion 78. A shaft hole 80a is formed through at a position extending the central axis of the guide hole 82a or in the vicinity thereof at the end of the main body portion 80 on the positive Z-axis direction side.

[0054] As shown in FIG. 11(a), the first link member 68 has a link main body portion 84 composed of two plate members facing each other and an operation lever 86 extending from one end of the link main body portion 84, and these are integrally assembled by a screw member 88. A shaft hole 84a is formed through at the end of the link main body portion 84 opposite to the operation lever 86, and a shaft hole 84b is formed through at a position close to the operation lever 86 in the shaft hole 84a.

[0055] As shown in Fig. 11(b), the second link member 70 is a plate member formed in a substantially V-shape with an obtuse angle. A shaft hole 70a is formed through one end, a shaft hole 70b is formed at the other end, and an arcuate notch 70c is provided at the inner central portion of the V-shape.

[0056] In addition, when assembling the movable member 64, the fixed member 66, the first link member 68, and the second link member 70 integrally, three shaft hole guide rings 90(1), 90(2), 90(3) and three types of screw members 92(1), 92(2), 92(3) shown in Fig. 11(c) are used.

[0057] When assembling these members to the clamp jig 62, as shown in Fig. 8(a), for the movable member 64, the rod portion 74 is inserted into the guide hole 82a of the rod guide portion 82 of the fixed member 66, and the movable clamping surface 78a faces the fixed clamping surface 78, and the rod portion 74 is slidably supported in the positive and negative Z-axis directions.

[0058] One end of the first link member 68 is rotatably connected to one end of the main body portion 80 of the fixed member 80 via the second shaft mounting portion 94(2). Specifically, as shown in Figs. 12(a) and (b), two link main body portions 84 are arranged between the two main body portions 80, the shaft hole guide ring 90(2) is inserted into the communicating shaft holes 80a and 84a, and the inner wall surfaces of the shaft holes 80a and 84a are slidably supported on the outer peripheral surface of the shaft hole guide ring 90(2). Then, the screw member 92(2) is inserted into the shaft hole guide ring 90(2) and tightened and fixed at both ends of the shaft hole guide ring 90(2) to form the second shaft mounting portion 94(2).

[0059] One end of the second link member 70 is rotatably connected via a third shaft attachment portion 94(3) to a position on the first link member 68 closer to the operation lever 86 than the second shaft attachment portion 94(2). Specifically, as shown in FIGS. 12(a) and (b), the second link member 70 is disposed between the two link main body portions 84, and a shaft hole guide ring 90(3) is inserted into the communicating shaft holes 70b and 84b, and the inner wall surfaces of the shaft holes 70b and 84b are slidably supported by the outer peripheral surface of the shaft hole guide ring 90(3). Then, a screw member 92(3) is inserted into the shaft hole guide ring 90(3) and fastened and fixed to both ends of the shaft hole guide ring 90(3), and the third shaft attachment portion 94(3) is formed.

[0060] The other end of the second link member 70 is rotatably connected via a first shaft attachment portion 94(1) to one end of the movable member 64. Specifically, as shown in FIGS. 12(a) and (c), the second link member 70 is disposed between the tip portions of the rod portions 74, and a shaft hole guide ring 90(1) is inserted into the communicating shaft holes 70a and 74a, and the inner wall surfaces of the shaft holes 70a and 74a are slidably supported by the outer peripheral surface of the shaft hole guide ring 90(1). Then, a screw member 92(1) is inserted into the shaft hole guide ring 90(1) and fastened and fixed to both ends of the shaft hole guide ring 90(1), and the first shaft attachment portion 94(1) is formed.

[0061] In addition, as shown in FIG. 8(a), the clamp jig 62 is provided with a remote operation tool 96 such as a string member for remotely operating the operation lever 86 of the clamp jig 62, and a fall prevention connection tool 98 such as a string member for connecting a specific portion (here, the operation lever 86) of the clamp jig 62 to the lower segment 14. The usage and operation of the clamp jig 62 will be described in the description of subsequent steps.

[0062] <Clamp jig mounting step K22> In the clamp jig mounting step K22, the flange portions 16a(2) and 18a(2) of the upper and lower main column members 16(2) and 18(2) shown in FIG. 4(a) are clamped by the clamp jig 62. The clamp jig 62 is mounted according to the following procedure.

[0063] First, as shown in FIG. 8(a), the operation lever 86 of the clamp jig 62 is operated to tilt the link main body 84 in a direction intersecting the Z-axis. Then, the second link member 70 and the movable member 64 are displaced, the movable clamping surface 72a moves in the negative Z-axis direction, and the fixed clamping surface 78a and the movable clamping surface 72a are greatly separated from each other.

[0064] In this state, the fixed clamping surface 78a is brought into contact with the upper surface of the end portion 16a(2), and the flange portions 16a(2), 18a(2) are disposed between the fixed clamping surface 78a and the movable clamping surface 72a. As shown in FIG. 8(b), the operation lever 86 is operated to lift the link main body 84 in the positive Z-axis direction. Then, the second link member 70 and the movable member 64 are displaced, and the movable clamping surface 72a moves in the positive Z-axis direction. When the third shaft mounting portion 94(3) reaches a position extending the axis of the rod portion 74 or the vicinity thereof, the shaft hole guide ring 90(2) of the second shaft mounting portion 94(2) engages with the notch 70c of the second link member 70. Thereby, the second link member 70 is locked to the second shaft mounting portion 94(2), and the position of the movable clamping surface 72a with respect to the fixed clamping surface 78a is fixed.

[0065] In the state of FIG. 8(b), the flange portions 16a(2), 18a(2) are not strongly clamped by the two clamping surfaces 78a, 72a. Therefore, as shown in FIG. 8(c), the adjustment bolt 76 is tightened to move the movable clamping surface 72a in the direction of the fixed clamping surface 78a to strongly clamp the flange portions 16a(2), 18a(2). Then, the fall prevention connector 98 is connected to an appropriate position of the lower segment 14, and the clamp jig mounting step K22 is completed.

[0066] <Post pin mounting step K23> In the post pin mounting step K23, first, the bolt fixing of the upper main column member 16(2) and the lower main column member 18(2) is released by removing a plurality of vertical bolts 30 shown in FIG. 4, and the upper main column member 16(2) and the lower main column member 18(2) are temporarily fixed only by the clamp jig 62. Then, as shown in FIGS. 13(a) and (b), a post pin 100 is mounted in the bolt holes 20(2) and 22(2) that communicate in the vertical direction with the vertical bolts 30 removed.

[0067] The post pin 100 is a member having a pin portion 100a with a thickness that can pass through the bolt holes 20(2) and 22(2) and a locking portion 100b with a size that cannot pass through the bolt holes 20(2) and 22(2). The post pin 100 is inserted into the bolt holes 20(2) and 22(2) from above, the pin portion 100a is projected below the bolt hole 22(2), and the locking portion 100b is supported by the peripheral portion above the bolt hole 20(2). The post pin 100 is a member for laterally positioning the upper main column member 16(2) with respect to the lower main column member 18(2) after the clamp jig 62 is removed, and will be described in detail later.

[0068] In addition, since the post pin 100 also functions as a part of an end closing jig 102 to be described later, here, the post pin 100 is mounted at two diametrically opposed positions on the flange portion 16a(2) shown in FIG. 4(b).

[0069] <End closing jig preparation step K24 / End closing jig mounting step K25> In the end closing jig preparation step K24, in order to prevent the filler 16c(2) in the upper main column member 16(2) from falling off when the B portion, which is the connecting portion of the upper and lower main column members 16(2) and 18(2), is separated, an end closing jig 102, which is an embodiment of the end closing jig of the present invention, is prepared.

[0070] As shown in FIGS. 14(a) and 14(b), the end closing jig 102 is composed of a base 104, a shutter 106, a shutter support mechanism 108, and a biasing means 110. In FIG. 14(a), the biasing means 110 and the members around it are not shown in order to make the structure of the base 104 and its peripheral part easier to see. In the end closing jig preparation step K24, individual parts (or parts with some parts assembled) are prepared for this end closing jig 102, and it will be assembled during the end closing jig mounting step K25.

[0071] The base 104 is a member that is detachably fixed to the upper main column member 16(2) and serves as the main body of the end closing jig 102. The base 104 includes a flat plate portion 104a and a fixing portion 104b that stands up from an end of the flat plate portion 104a. The flat plate portion 104a is placed on the upper surface of the flange portion 16a(2) of the upper main column member 16(2), and the fixing portion 104(b) is brought into contact with the side surface of the cylindrical main body portion 16b(2) of the upper main column member 16(2), and is firmly fixed using a belt-shaped fastener 112 or the like. Further, at the end of the flat plate portion 104a on the side opposite to the fixing portion 104b, the end bulges outward, and a rod member 104c extending outward is integrally provided at this bulged portion.

[0072] The shutter 106 is a substantially elliptical plate member sized to be able to close the open end of the cylindrical main body portion 16b(2), and one end is supported by the shutter support mechanism 108. A pair of slits 106a having a predetermined width extending inward from one side end are provided at both ends of the shutter 106, and further, a rod member 106b extending outward is integrally provided at one end.

[0073] The shutter support mechanism 108 is a mechanism that is attached to the base 104 and pivotally supports one end of the shutter 106, and enables the shutter 106 to move from a position closing the open end of the cylindrical main body portion 16b(2) to an open position. Specifically, it is composed of a shaft member 108a attached to the lower surface side of the flat plate portion 104a of the base 104 and pivotally supporting one end of the shutter 106, and two stopper members that define the closed position of the shutter 106.

[0074] As shown in FIGS. 14(a) and 14(b), in the case of this shutter support mechanism 108, the post pin 100 attached in the post pin attachment step K23 serves as a stopper member. Therefore, in the post pin attachment step K23, one of the two post pins 100 is inserted into the bolt holes 20(2) and 22(2) through the through holes provided in the flat plate portion 104a of the base body 104.

[0075] The shutter 106 supported by the shaft member 108a is disposed at the height of the flange portion 18a(2) of the lower main column member 18(2) in a front view and is disposed laterally of the flange portions 16a(2) and 18a(2) in a plan view with the base body 104 fixed to the upper main column member 16(2).

[0076] The biasing means 110 is a member that is attached to the base body 104 and biases the shutter 106 toward a position closing the opening end of the cylindrical main body portion 16b(2). Here, a tension coil spring is used. One end of the biasing means 110 is attached to the tip of the rod member 104b of the base body 104, and the other end is attached to the tip of the rod member 106b of the shutter 106. Therefore, when the biasing means 110 is attached, the shutter 106 is biased in a counterclockwise direction in a plan view around the shaft member 108a, and the side end face is strongly pressed against and locked to the outer peripheral surface of the flange portion 18a(2). Although the drawing shows a structure in which the shutter 106 is biased counterclockwise in a plan view, it is also possible to adopt a structure in which it is biased in the opposite direction (clockwise).

[0077] In this way, the end closing jig 102 is assembled while individual parts (or parts with some parts assembled) are prepared in the end closing jig preparation step K24 and the end closing jig attachment step K25 is performed. Also, as described above, since the post pin 100 that operates as a stopper member needs to be inserted into the bolt holes 20(2) and 22(2) through the through holes in the flat plate portion 104a of the base body 104 after the base body 104 is attached to the upper main column member 16(2), the post pin attachment step K23 is performed in parallel with the end closing jig attachment step K25.

[0078] Note that FIGS. 14(a) and (b) show the state before the end-closure jig 102 operates (the state when the end-closure jig mounting step K25 and the post-pin mounting step K23 are completed), and at this time, the post-pin 100 does not operate as a stopper member. The operation of the post-pin 100 as a stopper member will be described in the description of subsequent steps.

[0079] <Clamp jig removal step K26> The clamp jig removal step K26 is a step performed after the post-pin mounting step K23 and the end-closure jig mounting step K25. It is a step of removing the clamp jig 62 (the clamp jig 62 in FIG. 8(c)) mounted in the previous clamp jig mounting step K22 and releasing the temporary fixation between the ends of the upper main column member 16(2) and the lower main column member 18(2).

[0080] When removing the clamp jig 62, an operator at a safe distance operates the operation lever 86 using the remote operation tool 96 and tilts the link main body portion 84 in a direction intersecting the Z-axis, thereby releasing the locking of the second link member 70 by the second shaft mounting portion 94(2). Then, as shown in FIG. 8(a), the movable clamping surface 72a moves away from the fixed clamping surface 78a, the clamp jig 62 drops off, and the temporary fixation between the upper main column member 16(2) and the lower main column member 18(2) is released. The dropped clamp jig 62 is connected to the lower segment 14 by the fall-preventing connector 98 and is thus held without falling to the ground.

[0081] Even after the temporary fixation by the clamp jig 62 is released, the upper main column member 16(2) is supported from below by the lower main column member 18(2) and is positioned laterally by the post-pin 100, so it remains in the same state. Therefore, the end-closure jig 102 does not operate and remains in the state shown in FIGS. 14(a) and (b).

[0082] In this embodiment, the clamp jig removal step K26 is performed after the end closing jig mounting step K25, but it can also be performed before the end closing jig mounting step K25. However, in order to ensure the safety of the operator performing the end closing jig mounting step K25, as shown in FIG. 5, the clamp jig removal step K26 is preferably performed after the end closing jig mounting step K25.

[0083] <Suspension wire connection step K31> The suspension wire connection step K31 is a step of connecting the suspension wire 36a lowered from the lifting means 36 to the upper segment 12. For example, as shown in FIG. 2, an operation of connecting the receiving wire 34 to a specific part of the upper segment 12 and hooking the hook 36b at the tip of the suspension wire 36a on the receiving wire 34 is performed.

[0084] Note that the means for connecting the suspension wire 36a to the upper segment 12 is not particularly limited, and other means other than the hook 36b and the receiving wire 34 may be used. Further, since the suspension wire connection step K31 is not directly related to the steps K11 to K13 related to part A and the steps K21 to K26 related to part B, it can be performed at an appropriate timing convenient for the operator. In order to ensure the safety of the operator, the suspension wire connection step K31 is preferably performed before the clamp jig removal step K26.

[0085] <Weight confirmation step K32> The weight confirmation step K32 is a step performed after the temporary fixing jig mounting step K12, the wedge member mounting step K13, the clamp jig removal step K26, the end closing jig mounting step K25, and the suspension wire connection step K31, and is a step of slightly lifting the upper segment 12 by the lifting means 36 to confirm the weight of the upper segment 12.

[0086] When performing the weight confirmation process K32, part A, which is the connection part of the upper main column member 16(1) and the lower main column member 18(1), is in a state temporarily fixed by the temporary fixing jig 38 (Figure 7). Also, part B, which is the connection part of the upper main column member 16(2) and the lower main column member 18(2), has the post pin 100 attached (Figure 13(b)), the end closing jig 102 attached (Figure 14), and the clamp jig 62 has already been removed.

[0087] In this state, when the lifting means 36 slightly lifts the upper segment 12, as shown in Figure 15, the upper segment 12 rotates about the movable pin 48 of the temporary fixing jig 38, and the flange portion 16a(2) of the upper main column member 16(2) slightly rises above the flange portion 18a(2) of the lower main column member 18(2). Therefore, the lifting means 36 can use an appropriate weight detection means to confirm whether the weight of the upper segment 12 is within the allowable range (whether the weight that the lifting means 36 can lift).

[0088] At this time, as shown in Figure 13(c), the post pin 100 rises together with the flange portion 16a(2) and is slightly pulled out from the bolt hole 22(2) of the flange portion 18a(2), but does not completely come out and remains in the bolt hole 22(2).

[0089] Also, the end closing jig 102 rises together with the flange portion 16a(2) of the upper main column member 16(2). Then, the height position of the shutter 106 becomes higher than the flange portion 18a(2), and the end closing jig 102 operates. That is, since the side end surface of the shutter 106 is no longer locked to the outer peripheral surface of the flange portion 18a(2), as shown in Figures 16(a) and (b), the shutter 106 is urged by the urging means 110 and rotates clockwise around the shaft member 108a in a bottom view. And it instantaneously moves to the position where the deepest part of the slit 106a is locked to the side peripheral surface of the post pin 100, which is a stopper member, and is held at this position by the urging force of the urging means 110. Thus, the opening end of the cylindrical main body portion 16b(2) of the upper main column member 16(2) is closed by the shutter 106, and the filler 16c(2) inside is prevented from falling off.

[0090] When the weight of the upper segment 12 is checked, the lifting means 36 stops lifting the upper segment 12 and lowers the load. Since the upper segment 12 is positioned laterally by the post pin 100 while being slightly lifted, it can safely return to its position before lifting. Also, although the shutter 106 has moved to a position closing the end of the upper main pillar member 16(2), it does not prevent the upper segment 12 from returning to its position before lifting. In addition, as a result of performing the weight check step K32, when it can be confirmed that the weight of the upper segment 12 is within the allowable range, the next step can be proceeded to. However, when it is confirmed that the weight exceeds the allowable range, subsequent steps are aborted, and after taking safety measures, the situation is checked and countermeasures are considered.

[0091] <Temporary fixing jig removal step K14> The temporary fixing jig removal step K14 is a step of releasing the temporary fixing by the temporary fixing jig 38 at portion A which is the connecting portion of the upper main pillar member 16(1) and the lower main pillar member 18(1). Specifically, as shown in FIG. 17, first, an operator staying at a safe place at a little distance operates the pull-out tool 56 to pull out the retaining pin 52 and releases the retaining of the insertion portion 48a of the movable pin 48. Then, the pulling tool 58 is operated to pull the end of the main body member 40 of the temporary fixing jig 38, and with the corner portion 40a where the first and second side surfaces 40b, 40c intersect as a fulcrum, the first side surface 40b is obliquely separated from the peripheral portion of the bolt hole 22(1). Then, the movable pin 48 rotates around the shaft member 50 and its axis is held horizontally, and the insertion portion 48a can be smoothly pulled out from the bolt holes 20(1), 22(1).

[0092] When the insertion portion 48a is completely pulled out and the temporary fixing jig 38 drops off, the temporary fixing of the upper main pillar member 16(1) to the lower main pillar member 18(1) is released, and the upper main pillar member 16(1) is supported by the wedge member 54 on the lower main pillar member 18(1). Since the dropped temporary fixing jig 38 is connected to the lower segment 14 by the fall prevention connector 60, it is held without falling to the ground.

[0093] <Lifting and removal process K33> The lifting and removal process K33 is a process of lifting the upper segment 12 by the lifting means 36 and removing it to another place. When performing the lifting and removal process K33, at the connecting part A of the upper main column member 16(1) and the lower main column member 18(1), the temporary fixing by the temporary fixing jig 38 is released, and the upper main column member 16(1) is supported by the wedge member 54 on the lower main column member 18(1) (Figure 17). Also, at the connecting part B of the upper main column member 16(2) and the lower main column member 18(2), the post pin 100 is attached (Figure 13(b)), the end closing jig 102 is actuated (Figure 16), and the clamp jig 62 has already been removed.

[0094] Therefore, when the upper segment 12 is lifted greatly, part A separates without problems, and for part B as well, the post pin 100 rises together with the flange part 16a(2), and the pin part 100a of the post pin 100 is smoothly pulled out from the bolt hole 22(2) of the flange part 18a(2) and separates without problems.

[0095] As described above, the clamp jig 62 of this embodiment can firmly clamp the flange parts 16a(2) and 18a(2) of the upper main column member 16(2) and the lower main column member 18(2) with a strong force due to its unique structure. Also, the temporary fixing by the clamp jig 62 can be easily released by rotating the operation lever 86 by about 1 / 4 turn, so the burden on the worker working at a high place can be reduced, and moreover, the operation lever 86 can be remotely operated at a safe place.

[0096] Also, the tower dismantling method of the first embodiment is a unique dismantling method using the clamp jig 62 and the post pin 100, and further using the temporary fixing jig 38 and the end closing jig 102. It is very safe and can efficiently and safely perform the tower dismantling work.

[0097] The steps of using the clamp jig 62 and the post pin 100 (Steps K21 to K23, K26) are highly versatile. In addition to the case where the flange portions of the steel pipes filled with filler (including steel pipes not filled with filler), such as the upper main column members 16(2) and the lower main column members 18(2) described above, are bolted in the vertical direction, it can also be applied to the case where the ends of the main column members made of L-shaped steel materials are bolted in the vertical direction.

[0098] Also, by using the end closing jig 102, it is possible to effectively prevent the filler 16c(2) from falling off from the upper main column member 16(2) made of a steel pipe filled with filler, and ensure the safety of the operation. Moreover, the end closing jig 102 has a very simple structure and is easy to install on-site.

[0099] The temporary fixing jig 38 is a jig with a unique structure that utilizes the principle of a lever. After removing the horizontal bolt 24 that fixes the upper main column member 16(1) and the lower main column member 18(1) and inserting the movable pin 48 into the bolt holes 20(1), 22(1) for temporary fixing, when releasing the temporary fixing, the movable pin 48 can be smoothly pulled out by a very simple operation, reducing the burden on the workers working at heights. Moreover, it has a simple structure and can be manufactured at low cost, and its versatility is also very high.

[0100] Furthermore, due to the unique structures of the temporary fixing jig 38 and the post pin 100, it becomes possible to smoothly perform the above-mentioned weight confirmation step K32. Also, when it is confirmed in the weight confirmation step K32 that the weight of the upper segment 12 exceeds the allowable range, it is important to stop the subsequent steps to ensure safety. By using the temporary fixing jig 38 and the post pin 100, safety can be easily and surely ensured.

[0101] In addition, the temporary fixing jig 38 and the clamping jig 62 are structured such that a user who is in a safe location at a short distance can easily operate them using remote operation members (such as the pulling-out tool 56, the pulling tool 58, the remote operation tool 96, etc.). Since the end closing jig 102 does not require user operation (operates automatically), it can greatly contribute to ensuring the safety of the operator.

[0102] <<<Modifications of the First Embodiment, etc.>>> Next, regarding the applicable range of the modifications of the above-described first embodiment, it will be described based on FIGS. 18 to 31.

[0103] <<<Modifications regarding the clamping jig, the post pin, the end closing jig, and the tower dismantling method using the same, etc.>>> The dismantling method using the clamping jig and the post pin in the tower dismantling method of the present invention is not limited to the above embodiment. In the upper main column members 16(2) and the lower main column members 18(2) shown in FIGS. 4(a) and 4(b), the bolt holes 20(2) and 22(2) of the flange portions 16a(2) and 18a(2) communicate in a substantially vertical direction and are bolted with the vertical bolts 30. However, the dismantling method using the clamping jig and the post pin can be applied as long as the communication direction of the bolt holes 20(2) and 22(2) is in the "vertical direction", even if it is not strictly vertical.

[0104] For example, in the C portion which is the connecting portion of the upper main column member 16(2) and the lower main column member 18(2) shown in FIG. 18, the communication direction of the bolt holes 20(2) and 22(2) is slightly inclined. However, the above-described post pin mounting step K23 can be performed without problems. When the clamping jig removal step K26 and the weight confirmation step K32 are performed, the upper main column member 16(2) is appropriately positioned laterally by the post pin 100. When the lifting and removal step K33 is performed, the post pin 100 can be smoothly pulled out from the bolt hole 22(2) of the flange portion 18a(2). Therefore, the communication direction of the bolt holes 20(2) and 22(2) shown in FIG. 18 corresponds to the "vertical direction", and the dismantling method using the clamping jig and the post pin can be applied.

[0105] On the other hand, in the D part which is the connecting part of the upper main column member 16(2) and the lower main column member 18(2) shown in FIG. 19, since the communication direction of the bolt holes 20(2) and 22(2) is substantially horizontal, even if the post pin mounting process K23 could be performed, when the clamp jig removal process K26 or the weight confirmation process K32 is carried out, the upper main column member 16(2) is not positioned horizontally by the post pin 100, and when the lifting and removal process K33 is carried out, the post pin 100 cannot be smoothly pulled out from the bolt hole 22(2) of the flange part 18a(2). Therefore, the communication direction of the bolt holes 20(2) and 22(2) shown in FIG. 19 does not correspond to the "vertical direction", and the disassembly method using the clamp jig and the post pin cannot be applied.

[0106] However, the clamp jig of the present invention can be used if the conditions are met even when separating the D part shown in FIG. 19 by another tower disassembly method. That is, if the tower disassembly method temporarily fixes the flange parts 16a(2) and 18a(2) by another method before releasing the bolt fixing, and releases the temporary fixing after releasing the bolt fixing, the clamp jig of the present invention can be effectively utilized.

[0107] The tower disassembly method suitable for the C part and the D part shown in FIGS. 18 and 19 will be described later as the second embodiment of the tower disassembly method of the present invention.

[0108] The above-mentioned end closing jig 102 is an effective jig when the upper main column member 16(2) is a steel pipe filled with a filler. When the filler 16c(2) is not filled inside the cylindrical main body part 16b(2) of the upper main column member 16(2), it is not necessary to use the terminal closing jig 102. Therefore, the end closing jig preparation process and the mounting processes K24 and K25 in the "processes related to the B part (processes K11 to K14)" in the flowchart shown in FIG. 5 can be omitted.

[0109] Also, as shown in Fig. 20(a), when the connecting parts of the upper segment 12 and the lower segment 14 are all in the form like part B shown in Figs. 4(a) and 4(b) (the ends 16a(2) and 18a(2) of the upper main column member 16(2) and the lower main column member 18(2) are bolted with a plurality of vertical bolts 30), the tower dismantling method of the present invention can be used. In this case, the "steps related to part A (K11 to K14)" in the flowchart shown in Fig. 5 are omitted, and the "steps related to part B (K21 to K26)" are executed for each connecting part. And when the clamp jig removal step K26 and the weight confirmation step K32 are performed, as shown in Fig. 13(c), each upper main column member 16(2) is properly positioned laterally by the post pin 100, and when the lifting and removal step K33 is performed, the post pin 100 can be smoothly pulled out from the bolt holes 22(2) of each flange part 18a(2).

[0110] The clamp jig of the present invention is not limited to the above embodiment, and the shapes and sizes of the individual constituent members (the movable member, the fixed member, the first link member, and the second link member) can be freely changed within the range where the same operation as that of the clamp jig 62 is possible.

[0111] The end closing jig of the present invention is not limited to the above embodiment. In the case of the above end closing jig 102, when the weight confirmation step K32 is completed (when the shutter 106 is in the position closing the open end of the upper main column member 16(2)), the biasing means 110 continues to bias the shutter 106, thereby preventing the shutter 106 from returning to its original position. However, when it is difficult to continue the biasing by the biasing means 110 due to structural design, it is advisable to use an end closing jig 102x which is a modified example of the end closing jig 102. Hereinafter, the differences (characteristic differences) between the end closing jig 102x and the end closing jig 102 will be described based on Figs. 21 and 22.

[0112] The end-closure jig 102x has a narrow protruding portion 104d that protrudes outwardly extending from the side end of the flat plate portion 104a of the base body 104, and a through hole 104e that penetrates in the vertical direction is formed substantially at the center of the protruding portion 104d. In addition to the post pin 100 which is a stopper member, a new stopper member 114 is added. The stopper member 114 is composed of a hollow housing 114a, a movable pin 114b whose base end is housed inside the housing 114a and whose tip end protrudes and retracts from the opening on the lower surface side of the housing 114a, and a spring member 114c whose one end is fixed to the housing 114a and whose other end biases the base end of the movable pin 114b downward. The housing 114a is arranged at a position where the opening on the lower surface side communicates with the through hole 104e of the protruding portion 104d and is firmly fixed to the upper surface of the protruding portion 104d. Further, the shutter 106 is characterized in that a wide locking portion 106c that protrudes outwardly extends from the side end at a position overlapping the flat plate portion 104a.

[0113] As another difference from the terminal-closure jig 102, the slit 106a of the shutter 106 is changed from two places to one place, but this does not change the substantial function and operation.

[0114] As shown in FIGS. 21(a) and (b), when the end-closure jig mounting step K25 is completed (when the shutter 106 is at a position where it opens the open end of the upper main column member 16(2)), the movable pin 114b of the stopper member 114 is in a state where its base end is retracted to a deep position inside the housing 114a and its tip end is slidably locked to the upper surface of the locking portion 106c of the shutter 106. In this state, the movable pin 106c does not prevent the shutter 106 from rotating around the shaft member 108a.

[0115] Then, as shown in FIGS. 22(a) and (b), when the weight confirmation step K32 is completed (when the shutter 106 moves to a position where it closes the opening end of the upper main column member 16(2)), the tip of the movable pin 114b is no longer engaged with the upper surface of the locking portion 106c of the shutter 106, and is urged by the spring member 114c to protrude downward significantly. Thus, even if the shutter 106 tries to return to its original position, the side end surface of the locking portion 106c is engaged with the side peripheral surface of the movable pin 114b and cannot return. In this way, in the case of the end closing jig 102x, even if the biasing means 110 does not continue to bias the shutter 106, the shutter 106 can be reliably held in the closed position.

[0116] In addition, although not provided in the terminal closing jigs 102 and 102x, it is preferable to attach means for detecting that the shutter 106 has moved and been held normally from the open position to the closed position and displaying this conspicuously (for example, means for causing a flag, a ribbon, etc. to appear). Thereby, even when the operator is in a distant location, the operating status of the jig can be easily recognized. Also, in order to stabilize the operation of the post pin 100, which is a stopper member, the locking portion 100b of the post pin 100 may be fixed to the flat plate portion 104a of the base 104 by a method such as welding. Further, in the case of the terminal closing jigs 102 and 102x, when the base 104 is fixed to the upper main column member 16(2), a belt-shaped fastener 112 is used for fixing, but it is preferable to further use a metal member such as a turnbuckle in combination to fix it more firmly.

[0117] Regarding the disassembly method using a clamp jig and a post pin in the method for disassembling a steel tower of the present invention, as described with reference to FIGS. 13(b) and (c), in the above-described post pin mounting step K23, the vertical bolt 30 is removed, and the post pin 100 is inserted from above into the bolt holes 20(2) and 22(2) that communicate in the vertical direction, the pin portion 100a of the post pin 100 is projected below the bolt hole 22(2), and the locking portion 100b is supported on the upper peripheral edge portion of the bolt hole 20(2). As another method, as shown in FIGS. 23(a) to (c), the pin portion 100a of the post pin 100 is inserted from below into the bolt holes 20(2) and 22(2) that communicate in the vertical direction, the pin portion 100a is projected above the bolt hole 22(1), and the locking portion 100b located below the bolt hole 22(2) may be fixed to the lower main column member 18(2) using the fixture 134, and substantially the same operational effects can be obtained.

[0118] The fixture 134 may be composed of, for example, a band 134a tightened and fixed to the peripheral surface of the cylindrical main body portion 18b(2) of the lower main column member 18(2), a triangular plate 134b fixed to the end portion of the band 134, and a turnbuckle 134c connecting the locking portion 100b of the post pin 100 and the triangular plate.

[0119] When mounting the post pin 100 as shown in FIGS. 13(b) and (c), the mounting operation is easy, but when the upper segment 12 is lifted and removed and lowered to the ground, the pin portion 100a of the post pin 100 may hit the ground and bend or break, making it unusable for reuse. On the other hand, if the post pin 100 is mounted as shown in FIGS. 23(a) to (c), the post pin 100 remains on the lower segment 14 when the upper segment 12 is lifted and removed, and there is an advantage that the remaining post pin 100 can be removed and reused.

[0120] When the post pin 100 is attached by the method shown in Fig. 23, if there is a locking portion 100b (the base end portion that cannot pass through the bolt holes 20(2) and 22(2)) of the post pin 100, there is an advantage that it becomes easy to position the pin portion 100a in the vertical direction when fixing the post pin 100. If positioning can be performed by another method, the entire post pin 100 may be made thick enough to pass through the bolt holes 20(2) and 22(2).

[0121] Regarding the disassembly method using the clamp jig and the post pin in the tower disassembly method of the present invention, when performing the weight confirmation step K32 in the flowchart of Fig. 5, the upper segment 12 will be lifted slightly, and the lifting amount needs to be adjusted properly so that the post pin 100 does not come out of the bolt hole 22(2) of the flange portion 18a(2). If there is a concern that the post pin may come out, as shown in Fig. 24, it is advisable to add three more steps K27 to K29. Hereinafter, the contents of steps K27 to K29 (U-shaped metal fitting preparation step K27, U-shaped metal fitting attachment step K28, and U-shaped metal fitting removal step K29) will be described in order.

[0122] <U-shaped metal fitting preparation step K27> In the U-shaped metal fitting preparation step K27, a U-shaped metal fitting 115 with a unique structure is prepared. As shown in Fig. 25(a), the U-shaped metal fitting 115 includes a U-shaped main body member 116 and a pin member 124. The U-shaped main body member 116 is composed of a vertical member 118 and first and second horizontal members 120 and 122 that extend laterally from both ends thereof and face each other. A pair of first and second through holes 120a and 122a that communicate with each other are formed at the respective tip ends of the first and second horizontal members 120 and 122.

[0123] The pin member 124 is composed of a hollow housing 124a, a movable pin 124b whose proximal end portion projects slightly from the opening on the lower surface side of the housing 124a and whose upper portion projects long from the opening on the lower surface side of the housing 114a, and a spring member 124c whose one end is fixed to the housing 114a and which biases the movable pin 124b in the direction of the proximal end portion. The upper end portion of the movable pin 124b has a thickness that allows it to be inserted with clearance inside the first and second through holes 120a and 122a.

[0124] In addition, the U-shaped fitting 115 is provided with a positioning pin 126 (positioning member) that can be attached to and detached from the upper end portion of the movable pin 124b. The positioning pin 126 is a small pin that can be inserted into a through hole 124d that penetrates the upper end portion of the movable pin 124b in the diameter direction. Further, the U-shaped main body member 116 and the pin member 124 (the proximal end portion of the movable pin 124b) are each provided with a fall prevention connector 128, 130 such as a string member for connecting them to the lower segment 14, and the positioning pin 126 is provided with a pulling tool 132 such as a string member for pulling it out from a distant location. The usage and operation of the U-shaped fitting 115 will be described in the description of the subsequent steps K28 and K29.

[0125] <U-shaped fitting mounting step K28> The U-shaped fitting mounting step K28 is a step that is performed in parallel with the post pin mounting step K23 after the clamp jig mounting step K22. In the U-shaped fitting mounting step K23, first, the bolt fixing of the upper main column member 16(2) and the lower main column member 18(2) is released by removing a plurality of vertical bolts 30 shown in FIG. 4, and the upper main column member 16(2) and the lower main column member 18(2) are temporarily fixed only by the clamp jig 62. Then, as shown in FIG. 25(b), the post pin 100 is mounted in specific bolt holes 20(2), 22(2) that communicate in the vertical direction with the vertical bolts 30 removed, and the U-shaped fitting 115 is mounted in the other bolt holes 20(2), 22(2).

[0126] When installing the U-shaped fitting 115, first place the flange portions 16a(2) and 18a(2) of the upper main column member 16(2) and the lower main column member 18(2) between the first cross member 120 and the second cross member 122 of the U-shaped main body member 116, and vertically align the bolt holes 20(2) and 22(2) from which the vertical bolt 30 has been removed with the first and second through holes 120a and 122a. Then, insert the movable pin 124b from the side of the second through hole 122a, and project the upper end portion of the movable pin 124b upward from the first through hole 120a. Further, push up the proximal end portion of the movable pin 124b against the biasing force of the spring member 124c, expose the through hole 124d above the first through hole 120a, insert the pin member 124, and prevent the movable pin 124b from coming out. This results in the state where the U-shaped fitting 115 is installed (the assembled state of the U-shaped fitting 115), and the lower surface of the first cross member 120 abuts against and is supported by the upper surface of the flange portion 16a(2). When the weight confirmation process K32 is performed, as shown in FIG. 25(c), the U-shaped fitting 115 defines the maximum value of the lifting amount of the upper segment 12 (the maximum value of the separable distance between the flange portions 16a(2) and 18a(2)) by the distance between the first cross member 120 and the second cross member 122, and functions to prevent the post pin 100 from coming out of the bolt hole 22(2) of the flange portion 18a(2).

[0127] <U-shaped fitting removal process K29> The U-shaped fitting removal process K29 is a process of removing the U-shaped fitting 115 after the weight confirmation process K32 and before the lifting removal process K33. When removing the U-shaped fitting 115, first, an operator in a safe location at a short distance operates the extractor 132 to extract the positioning pin 126 and release the retention of the movable pin 124b. When the retention of the movable pin 124b is unlocked, the movable pin 124b moves downward under the biasing force of the spring member 124c and drops out of the U-shaped main body portion 116, and the U-shaped main body portion 116 also drops out of the flange portions 16a(2) and 18a(2). Thus, the subsequent lifting removal process K33 can be performed without any trouble. Since the dropped U-shaped main body member 116 and the pin member 124 are connected to the lower segment 14 by the fall prevention connectors 128 and 130, they are held without falling to the ground.

[0128] Thus, by adding the above three steps K27 to K29, when performing the weight confirmation step K32, it is possible to easily and surely prevent the post pin 100 from accidentally coming out of the bolt hole 22(2) of the flange portion 18a(2).

[0129] In addition, the clamp jig and the end closing jig of the present invention are suitable for use in the dismantling of iron towers where work is performed at high altitudes. However, if the conditions are met, they can also be used for other applications such as the construction or dismantling of bridges and buildings.

[0130] <<Modifications related to the temporary fixing jig and the method for dismantling an iron tower using the same>> The dismantling method using the temporary fixing jig in the iron tower dismantling method of the present invention is not limited to the above embodiment. The upper main column member 16(1) and the lower main column member 18(1) shown in FIGS. 3(a) and 3(b) have bolt holes 20(1) and 22(1) in the flange portions 16a(1) and 18a(1) communicating in a substantially horizontal direction and bolt-fixed with a horizontal bolt 24. However, in the dismantling method using the temporary fixing jig, even if the communication direction of the bolt holes 20(1) and 22(1) is not strictly horizontal, it can be applied as long as it is in the "horizontal direction". That is, even when the communication direction of the bolt holes 20(1) and 22(1) is slightly inclined, as long as the inclination is within the range where the temporary fixing jig 38 can function properly when used in the above manner, the communication direction of the bolt holes 20(1) and 22(1) corresponds to the "horizontal direction", and the dismantling method using the temporary fixing jig can be applied.

[0131] Also, as shown in FIGS. 26 to 28, when both the E portion and the F portion, which are the connecting portions of the upper main column member 12 and the lower segment 14, are in the form shown in the A portion in FIG. 3 (the end portions 16a(1) and 18a(1) of the upper main column member 16(1) and the lower main column member 18(1) are bolt-fixed with a plurality of horizontal bolts 24), the dismantling method using the temporary fixing jig can be used. In this case, the dismantling work is preferably performed according to the procedure shown in FIG. 29.

[0132] First, for the E part located on the upper side, the above-mentioned temporary fixing jig preparation step K11 and temporary fixing jig mounting step K12 are performed in sequence. For the F part located on the lower side, the above-mentioned temporary fixing jig preparation step K11, temporary fixing jig mounting step K12, and temporary fixing jig removal step K14 are performed in sequence. Since it is considered that the E part and the F part do not need to have the wedge member 54 attached as seen from the structure of the entire upper segment 12, the wedge member attachment step K13 is not carried out. Whether to carry out the wedge attachment step K13 may be determined according to the situation.

[0133] Then, after performing the above-mentioned suspension wire connection step K31, a weight confirmation step K32 is carried out. When performing the weight confirmation step K32, the E part is in a state temporarily fixed by the temporary fixing jig 38 (Figure 7), and the F part is in a state where the temporary fixing by the temporary fixing jig 38 is released (Figure 17).

[0134] In this state, when the lifting means 36 slightly lifts the upper segment 12, as shown in Figure 30, the upper segment 12 rotates about the movable pin 48 of the temporary fixing jig 38 of the C part, and the upper main column member 16(1) of the F part is separated from the lower main column member 18(1) of the F part and is no longer supported. Therefore, the lifting means 36 can use an appropriate weight detection means to confirm whether the weight of the upper segment 12 is within the allowable range.

[0135] If there is no problem after performing the weight confirmation step K32, the temporary fixing jig removal step K14 is carried out for the E part, and the lifting removal step K33 is carried out to remove the upper segment 12. Thus, even when all the connecting parts of the upper main column member 12 and the lower segment 14 are in the form of the A part shown in Figure 3, the disassembly method using the temporary fixing jig can be used.

[0136] The temporary fixing jig of the present invention is not limited to the above embodiment. In the temporary fixing jig removal step K14, in order to smoothly pull out the movable pin 48 (insertion portion 48a) from the bolt holes 20(1) and 22(1), it is required that the main body member 40 does not accidentally shift from the state in which it was first set during the execution of step K14. This is because if the main body member 40 shifts, the principle of the lever cannot be effectively utilized. Therefore, for example, like the temporary fixing jig 38x of the modified example shown in FIG. 31, the structure of the shaft member 50 is such that the proximal end portion of the movable pin 48 is pivotally supported with respect to the main body member 40 so as to be swingable, and is supported via a swivel mechanism 50a that enables rotation around its own central axis. This can prevent the rotational force from acting on the main body member 40 even when the movable pin 48 rotates around the central axis, and can prevent the main body member 40 from rotating together. Similarly, it is preferable to provide a magnet 40d that attracts or adsorbs the peripheral edge of the bolt hole 22(1) near the first side surface 40b of the main body member 40 to suppress the displacement of the main body member 40.

[0137] In addition, the shape and size of the individual constituent members (the main body member and the movable pin) of the temporary fixing jig can be freely changed within the range in which the same operations as those of the above-described temporary fixing jig 38 or 38x are possible. Further, the temporary fixing jig of the present invention is suitable for use in the dismantling of iron towers where work is performed at high altitudes, but can also be used for other applications such as the construction or dismantling of bridges and buildings if the conditions are appropriate.

[0138] <<<Second Embodiment of the Present Invention (Construction Method Using Guide Wires)>>> Next, a second embodiment of the iron tower dismantling method of the present invention will be described with reference to FIGS. 32 to 35. Here, the same components as those in the above-described first embodiment are denoted by the same reference numerals, and the description thereof will be omitted.

[0139] FIG. 32 shows the state before dismantling of the upper segment 12 and the lower segment 14 to be dismantled using the iron tower dismantling method of the second embodiment. The upper segment 12 and the lower segment 14 are connected at portions C and D.

[0140] Part C has the same structure as Part C shown in Figs. 18(a) and (b), and is a steel pipe column filled with a filler. The flange portion 16a(2) of the upper main column member 16(2) is brought into contact with the flange portion 18a(2) of the lower main column member 18(2). The bolt holes 20(2) and 22(2) are communicated vertically, and the vertical bolt 30 is passed through. The vertical nut 32 is tightened at the tip of the vertical bolt 30, and the flange portions 16a(2) and 18a(2) are bolt-fixed by the vertical bolt 30 and the vertical nut 32.

[0141] Part D has the same structure as Part D shown in Figs. 19(a) and (b), and is a steel pipe column filled with a filler. The flange portion 16a(2) of the upper main column member 16(2) is brought into contact with the flange portion 18a(2) of the lower main column member 18(2). The bolt holes 20(2) and 22(2) are communicated horizontally, and the horizontal bolt 24 is passed through. The horizontal nut 26 is tightened at the tip of the horizontal bolt 24, and the flange portions 16a(2) and 18a(2) are bolt-fixed by the horizontal bolt 24 and the horizontal nut 26.

[0142] Next, the method for disassembling the iron tower of the second embodiment will be described based on the flowchart of Fig. 33. Among the steps shown in Fig. 33, steps K21 to K29 are operations related to Part C, steps K41 to K48 are operations related to Part D, and the other steps K31 to K33 are operations related to the lifting of the upper segment 12. The contents of each step will be described in order below.

[0143] <Steps K21 to K28> Steps K21 to K28 are steps performed on Part C before the weight confirmation step K32, and have the same content as the clamp jig preparation step K21, clamp jig mounting step K22, post pin mounting step K23, end closing jig preparation step K24, end closing jig mounting step K25, U-shaped metal fitting preparation step K28, and clamp jig removal step K26 in Fig. 24.

[0144] <Guide wire device preparation step K41 / Guide wire device installation step K42> In the guide wire device preparation step K41, in order to safely separate the D part, the guide wire device 136 shown in FIGS. 34 and 35 is prepared. The guide wire device 136 includes a guide wire 138 provided with an annular portion 138a at its tip, and a pulling device 140 such as a winch for pulling the guide wire 138. Further, it includes a Y-shaped fitting 142, a wire locking pin member 144, and a retaining pin 146 (locking pin portion retaining member), which are unique members.

[0145] The Y-shaped fitting 142 has a main body portion 148 fixed to the upper main column member 16(2). On one side surface of the main body portion 148, it is a member in which two locking plates 150 and 152 facing each other are erected. Insertion holes 150a and 152a are respectively provided inside the locking plates 150 and 152 and communicate with each other. The wire locking pin member 144 is a member having a base portion 154 of a size that cannot pass through the insertion holes 150a and 152a of the locking plates 150 and 152, and a locking pin portion 156 of a thickness that can pass through with some clearance. The retaining pin 146 is a member that can be inserted into and detached from a through hole 156a penetrating the tip portion of the locking pin portion 156 in the diameter direction.

[0146] In addition, the guide wire device 136 is provided with a pulling tool 158, which is a string member or the like for pulling out the retaining pin 146 at a location away from it, and a fall prevention connector 160, which is a string member or the like for connecting the wire locking pin member 144 to the lower segment 14.

[0147] In the guide wire device installation step K42, first, the main body portion 148 of the Y-shaped fitting 142 is fixed to the upper main column member 16(2). The fixing method is free, but for example, it is advisable to have a structure in which a band 162 is tightened and fixed to the peripheral surface of the cylindrical main body portion 18b(2) of the upper main column member 16(2), and the main body portion 148 is bolted to a band fixing portion 162a protruding laterally from the band 162.

[0148] Next, with the annular portion 138a of the guide wire 138 disposed between the two locking plates 150 and 152, the locking pin portion 156 of the wire locking pin member 144 is passed through the insertion hole 150a of the locking plate 150, the annular portion 138a of the guide wire 130, and the insertion hole 152a of the locking plate 152 in sequence, and the retaining pin 146 is inserted into the through hole 156a at the tip of the locking pin portion 156 protruding from the insertion hole 152a, thereby connecting the guide wire 138 to the Y-shaped fitting 142. Then, the pulling device 140 is attached to the lower main column member 18(2), and the pulling device 40 is operated to pull the guide wire 138 so that the flange portion 16a(2) of the upper main column member 16(2) is biased in a direction in which it is pressed against the flange portion 18b(2) of the lower main column member 18(2).

[0149] <Processes K43 to K47> The clamp jig preparation process K43, the clamp jig mounting process K44, the end closing jig preparation process K45, and the end closing jig mounting process K46 performed on the D portion are the same as the clamp jig preparation process K21, the clamp jig mounting process K22, the end closing jig preparation process K24, and the end closing jig mounting process K25 in FIG. 24.

[0150] Note that for the D portion, pay attention to the fact that the post pin mounting process is not performed. The above-mentioned end closing jigs 102 and 102x are configured such that the post pin 100 operates as a stopper member. The stopper member is a member that holds the shutter 106, which has been moved by being biased by the biasing means 110 after the upper segment 12 is separated from the lower segment 14, in a position closing the open end of the upper main column member 16(2). Therefore, for the end closing jig of the D portion, the above-mentioned end closing jigs 102 and 102x may be slightly modified and a stopper member different from the post pin may be attached.

[0151] <Clamp jig removal process K47> The clamp jig removal process K47 performed on the D part is a process performed after the guide wire device installation process K42, the clamp jig mounting process K44, and the end closing jig mounting process K46. By removing the horizontal bolt 24 and further removing the clamp jig 62, the upper main column member 16(2) and the lower main column member 18(2) are temporarily fixed by the guide wire device 136.

[0152] In this embodiment, the clamp jig removal process K47 is performed after the end closing jig mounting process K46. However, if the conditions are met, it is also possible to perform it before the end closing jig mounting process K46. However, in order to ensure the safety of the operator performing the end closing jig mounting process K46, as shown in Fig. 33, the clamp jig removal process K44 is preferably performed after the end closing jig mounting process K46.

[0153] <Suspension wire connection process K31> The suspension wire connection process K31 has the same content as the suspension wire connection process K31 in Fig. 24. Since the suspension wire connection process K31 has no direct relation to the processes K21~KK26 related to the C part and the processes K41~K47 related to the D part, it can be performed at an appropriate timing convenient for the operator. However, in order to ensure the safety of the operator, it is preferably performed before the clamp jig removal processes K26 and K47.

[0154] <Weight confirmation process K32> The weight confirmation process K32 has the same content as the weight confirmation process K32 in Fig. 24. When performing the weight confirmation process K32, for the C part, the post pin 100 and the U-shaped fitting 115 are mounted (Fig. 25(b)), the end closing jig 102 is mounted (Fig. 14), and the clamp jig 62 has already been removed. Also, for the D part, the guide wire device 136 is installed, the end closing jig 102 is mounted (Fig. 14), and the clamp jig 62 has been removed.

[0155] In this state, when the lifting means 36 slightly lifts the upper segment 12, as shown in Fig. 36, the upper segment 12 rotates about the D part (the positions of the flange parts 16a(1) and 18a(2)) connected by the guide wire device 136, and the flange part 16a(2) of the C part slightly rises above the flange part 18a(2). Therefore, the lifting means 36 can use appropriate weight detection means to confirm whether the weight of the upper segment 12 is within the allowable range (whether the weight that the lifting means 36 can lift).

[0156] At this time, as shown in Fig. 25(c), the post pin 100 of the C part rises together with the flange part 16a(2), and is slightly pulled out from the bolt hole 22(2) of the flange part 18a(2), but remains in the bolt hole 22(2) without completely coming out. Then, the shutter 106 of the end closing jig 102 of the C part operates, the opening end of the cylindrical main body part 16b(2) of the upper main column member 16(2) is closed by the shutter 106, and the filler 16c(2) inside is prevented from falling off.

[0157] Also, when the weight confirmation step K32 is performed, a gap is generated between the flange part 16a(2) and the flange part 18a(2) of the D part. Therefore, the shutter 106 of the end closing jig 102 of the D part operates, the opening end of the cylindrical main body part 16b(2) of the upper main column member 16(2) is closed by the shutter 106, and the filler 16c(2) inside is prevented from falling off.

[0158] However, it is also assumed that the end closing jig 102 of the D part operates when the clamp jig removal step K44 for the D part is performed. This is because when the clamp jig removal step K44 is performed, a gap may be generated between the flange part 16a(2) and the flange part 18a(2) against the pulling force of the guide wire device 136. The timing at which the end closing jig 102 of the D part operates can be either during the clamp jig removal step K44 or during the weight confirmation step K32, and each step can be carried out without hindrance.

[0159] When checking the weight of the upper segment 12, the lifting means 36 stops lifting the upper segment 12 and unloads it. Since the C part of the upper segment 12 is positioned laterally by the post pin 100 in a slightly lifted state, it can safely return to its position before lifting. Also, the D part of the upper segment 12 is pulled by the pulling device 140 of the guide wire device 136 and can safely return to its position before lifting.

[0160] In addition, as a result of performing the weight checking step K32, when it is confirmed that the weight of the upper segment 12 is within the allowable range, the next step can be advanced. However, when it is confirmed that the weight exceeds the allowable range, the subsequent steps are aborted, safety measures are taken, and then the situation is checked and countermeasures are considered.

[0161] <U-shaped fitting removal step K29 / guide wire device removal step K48> After the weight checking step K32, the U-shaped fitting removal step K29 is performed on the C part, and the guide wire device removal step K48 is performed on the D part. The U-shaped fitting removal step K29 has the same content as the U-shaped fitting removal step K29 in FIG. 24.

[0162] In the guide wire device removal step K48, from the state shown in FIG. 35(b), the operation of disconnecting the connection between the guide wire 138 and the Y-shaped fitting 142 is performed. First, the pulling device 140 is stopped, and an operator in a safe place a little away operates the pulling tool 158 to pull out the retaining pin 146 and release the retaining of the locking pin part 156 of the wire locking pin member 144. Then, the wire locking pin member 144 moves downward under its own weight, the locking pin part 156 falls off from the Y-shaped fitting 142, and the guide wire 138 detaches from the Y-shaped fitting 142. The dropped wire locking pin member 144 is connected to the lower segment 14 by the fall prevention connector 160 and is held without falling to the ground.

[0163] In addition, after pulling out the retaining pin 146 to release the retention of the locking pin portion 156, if the wire locking pin member 144 cannot fall off by its own weight, an operator at a safe location slightly away may operate the fall prevention connection portion 160 to cause the wire locking pin member 144 to fall off from the Y-shaped fitting 142.

[0164] <Lifting and removal process K33> The lifting and removal process K33 has the same content as the lifting and removal process K33 in FIG. 24. When performing the lifting and removal process K33, the upper main column member 16(2) and the lower main column member 18(2) at the C part have the post pin 100 installed, the end closing jig 102 is actuated, and the C-shaped fitting 115 and the clamp jig 62 are removed. Also, the upper main column member 16(2) and the lower main column member 18(2) at the D part are in a state where the guide wire 138 is detached from the Y-shaped fitting 142, the end closing jig 102 is actuated, and the clamp jig 62 is removed. Therefore, when the upper segment 12 is lifted significantly by the lifting means 36, the D part separates without problems, and for the C part as well, the post pin 100 rises together with the flange part 16a(2), and the pin part 100a of the post pin 100 is smoothly pulled out from the bolt hole 22(2) of the flange part 18a(2) and separates without problems.

[0165] As described above, the tower dismantling method of the second embodiment is a suitable method for dismantling the portion where the flange parts of the upper main column member and the lower main column member made of steel pipe materials are bolt-fixed in the horizontal direction. And by performing the unique guide wire device preparation process K41, the guide wire mounting and installation process K42, and the guide wire removal process K48, the safety is very high, and the tower dismantling work can be carried out efficiently and safely.

[0166] Furthermore, due to the unique structures of the guide wire device 136 and the post pin 100, the above weight confirmation step K32 can be performed smoothly. Also, when it is confirmed in the weight confirmation step K32 that the weight of the upper segment 12 exceeds the allowable range, it is important to stop the subsequent steps to ensure safety. By using the guide wire device 136 and the post pin 100, safety can be easily and surely ensured.

[0167] In addition, the guide wire device 136 and the clamp jig 62 are structured such that a user in a safe location at a short distance can easily operate them using members for remote operation (such as the guide wire 138, the extractor 158, the remote operation tool 96, etc.). Regarding the end closing jig 102, since no user operation is required (it operates automatically), it can greatly contribute to ensuring the safety of the operator.

[0168] <<<Modifications of the Second Embodiment, etc.>>> The disassembling method using the guide wire device in the tower disassembling method of the present invention is not limited to the above second embodiment. For example, in the upper main column member 16(2) and the lower main column member 18(2) of part D shown in FIG. 34, the bolt holes 20(1) and 22(1) of the flange portions 16a(2) and 18a(2) communicate in a substantially horizontal direction and are bolt-fixed with the horizontal bolt 24. However, even if the communication direction of the bolt holes 20(2) and 22(2) is not strictly horizontal, it can be applied as long as it is in the "lateral direction". That is, even when the communication direction of the bolt holes 20(2) and 22(2) is slightly inclined, as long as it is within the range of inclination where the guide wire device 136 can function properly when the guide wire device 136 is used in the above manner, the communication direction of the bolt holes 20(2) and 22(2) corresponds to the "lateral direction", and the disassembling method using the guide wire device can be applied.

[0169] Also, since the D part is where the upper main column members 16(2) and the lower main column members 19(2) are continuous horizontally, when removing the upper segment 12 in the lifting and removal process K33, even if the ends of the upper main column members 16(2) are not closed by the end closing jig 102, there is a possibility that the filler 16c(2) will not fall off. Therefore, when there is no concern about the filler 16c(2) falling off, the end closing jig preparation process K45 and the end closing jig mounting process K46 for the D part in Fig. 33 can be omitted.

Explanation of Reference Numerals

[0170] 10 Tower 12 Upper Segment 14 Lower Segment 16(1) Upper Main Column Member 16a(1) End 16(2) Upper Main Column Member (Steel Pipe with Filler) 16a(2) Flange Part (End of Upper Main Column Member) 16b(2) Cylindrical Body Part 16c(2) Reinforcing Filler 18(1) Lower Main Column Member 18a(1) End 18(2) Lower Main Column Member (Steel Pipe with Filler) 18a(2) Flange Part (End of Lower Main Column Member) 18b(2) Cylindrical Body Part 18c(2) Reinforcing Filler 20(1), 20(2), 22(1), 22(2) Bolt Holes 24 Horizontal Bolt 28 Gap 30 Vertical Bolt 34 Receiving Wire 36 Lifting Means 36a Lifting Wire 38, 38x Temporary Fixing Jig 40 Body Member 40a Corner 40b First Side 40c Second Side 40d Magnet 48 Movable Pin Insertion part 48a Through hole 48b Retention pin (retention member) 52 Wedge member 54 Pull-out tool 56 Pulling tool 58 Falling prevention connector 60 Clamping jig 62 Movable member 64 Fixed member 66 First link member 68 Second link member 70 Movable clamp part 72 Movable clamping surface 72a Rod part 74 Adjusting bolt 76 Threaded part 76a Fixed clamp part 78 Fixed clamping surface 78a Body part 80 Rod guide 82 Guide hole 82a Link body part 84 Operating lever 86 First shaft mounting part 94(1) Second shaft mounting part 94(2) Third shaft mounting part 94(3) Remote operation tool 96 Falling prevention connector 98 Post pin 100 Pin part 100a Locking part 100b End closing jig 102 Base 104 Shutter 106 Shutter support mechanism 108 Biasing means 110 Stopper member 114 C-shaped fitting 115 C-shaped body member 116 First horizontal member 120 First through hole 120a Second horizontal member 122 Second through hole 122a Pin member 124 126 Positioning pin (positioning member) 136 Guide wire device 138 Guide wire 138a Annular part 140 Tension device 142 Y-shaped fitting 144 Wire locking pin member 146 Retaining pin (locking pin part retaining member) 148 Body part 150, 152 Locking plates 150a, 152a Insertion holes 154 Base part 156 Locking pin part 156a Through hole 158 Extractor 160 Fall prevention connector K11 Provisional fixing jig preparation process K12 Provisional fixing jig mounting process K13 Wedge member mounting process K14 Provisional fixing jig removal process K21 Clamping jig preparation process K22 Clamping jig mounting process K23 Post pin mounting process K24 End closing jig preparation process K25 End closing jig mounting process K26 Clamping jig removal process K27 C-shaped fitting preparation process K28 C-shaped fitting mounting process K29 C-shaped fitting removal process K31 Hanging wire connection process K32 Weight confirmation process K33 Lifting and removal process K41 Guide wire device preparation process K42 Guide wire device installation process K43 Clamping jig preparation process K44 Clamping jig mounting process K45 End closing jig preparation process K46 End closing jig mounting process K47 Clamping jig removal process K48 Guide Wire Device Removal Process

Claims

1. In a method for disassembling a steel tower, which has an upper segment and a lower segment, bolt holes are respectively provided at the ends of an upper main column member, which is a component of the upper segment, and a lower main column member, which is a component of the lower segment. The upper segment and the lower segment are connected by passing a vertical bolt through the bolt holes of each other in the vertical direction and bolt-fixing the ends of the upper main column member and the lower main column member. The method for disassembling the steel tower by separating the upper segment from the lower segment comprises: a clamp jig preparation step of preparing a detachable clamp jig that clamps an object with two clamping surfaces; a clamp jig mounting step of clamping the ends of the upper main column member and the lower main column member with the clamp jig; after the clamp jig mounting step, by removing the vertical bolt, the bolt fixing between the upper main column member and the lower main column member is released, and the upper main column member and the lower main column member are temporarily fixed with the clamp jig. At the same time, a step of inserting a post pin having a pin portion with a thickness that can pass through the bolt hole and a locking portion with a size that cannot pass through the bolt hole into the bolt hole that is vertically communicated after the vertical bolt is removed, protruding the pin portion below the bolt hole, and supporting the locking portion on the upper peripheral edge of the bolt hole; or, a post pin mounting step of inserting a post pin having a pin portion with a thickness that can pass through the bolt hole into the bolt hole that is vertically communicated after the vertical bolt is removed, protruding the pin portion above the bolt hole, and fixing the base end portion located below the bolt hole to the lower main column member; after the post pin mounting step, a clamp jig removal step of removing the clamp jig and releasing the temporary fixing between the ends of the upper main column member and the lower main column member; a suspension wire connection step of connecting a suspension wire provided on a lifting means to the upper segment; and a lifting and removing step of lifting and removing the upper segment with the lifting means after the clamp jig removal step and the suspension wire connection step. The method for disassembling a steel tower is characterized by performing the above steps.

2. The tower disassembling method according to claim 1, wherein after the clamp jig removing step and the suspension wire connecting step, and before the lifting and removing step, a weight confirmation step is performed in which the upper segment is slightly lifted by the lifting means to confirm the weight of the upper segment.

3. When the ends of the upper main column member and the lower main column member are bolted to each other using a plurality of the bolt holes, A C-shaped body member having a vertical member and first and second horizontal members extending laterally from both ends thereof and facing each other, and a pair of first and second through holes communicating with each other are formed at the tip ends of the first and second horizontal members; A pin member inserted into the first and second through holes with a clearance; and a positioning member detachably attached to the upper end portion of the pin member. The upper end portion of the pin member protrudes upward from the first through hole, and the lower end portion of the pin member protrudes downward from the second through hole. A C-shaped fitting preparation step of preparing a C-shaped fitting in which the positioning member is attached to the upper end portion of the pin member and the pin member is positioned with respect to the C-shaped body member; A step performed in parallel with the post pin mounting step, in which the ends of the upper main column member and the lower main column member are arranged between the first horizontal member and the second horizontal member of the C-shaped body member, and the vertical bolts are removed. The bolt holes are communicated with the first and second through holes to insert the pin member, and the positioning member is attached to the upper end portion of the pin member to bring the C-shaped fitting into an assembled state. The C-shaped fitting defines the maximum value of the separable distance between the ends of the upper main column member and the lower main column member. A C-shaped fitting mounting step; A step performed after the weight confirmation step and before the lifting and removing step, in which the positioning member is removed from the pin member to separate the pin member and the C-shaped body member, and the C-shaped fitting is removed from the ends of the upper main column member and the lower main column member. The tower disassembling method according to claim 2, comprising a C-shaped fitting removing step.

4. The upper main column member and the lower main column member are members in which an outward flange portion is integrally formed at the open end of the cylindrical main body portion, and the bolt holes are formed in the flange portions serving as the ends of the upper main column member and the lower main column member. The tower disassembling method according to any one of claims 1 to 3.

5. The method for disassembling a steel tower according to claim 4, wherein the upper main column member and the lower main column member are steel pipe members filled with a filler for reinforcement inside the cylindrical main body portion.

6. An end closure jig preparation step of preparing an end closure jig including a base body detachable from the upper main column member, a plate-shaped shutter formed to have a size capable of closing the open end of the upper main column member, a shutter support mechanism attached to the base body for pivotally supporting an end of the shutter and enabling the shutter to move from a position closing the open end to an open position, and a biasing means attached to the base body for biasing the shutter toward the position closing the open end; Before performing the clamp jig removal step, an end closure jig mounting step of fixing the base body of the end closure jig to the upper main column member, moving the shutter to a position opening the open end against the biasing of the biasing means, and locking an end of the shutter to an outer peripheral surface of the flange portion of the lower main column member. The method for disassembling a steel tower according to claim 5.

7. A clamp jig used when disassembling a steel tower having an upper segment and a lower segment, in which bolt holes are respectively provided at an end of an upper main column member which is a constituent member of the upper segment and an end of a lower main column member which is a constituent member of the lower segment, and the upper segment and the lower segment are connected by passing a bolt through the bolt holes in communication with each other and bolt-fixing the ends of the upper main column member and the lower main column member to each other, and separating the upper segment from the lower segment, comprising a movable member, a fixed member, a first link member, and a second link member; The movable member is composed of a movable clamp portion having a movable clamping surface formed on the +Z-axis side, and a long rod portion extending in the +Z-axis direction from a side end portion of the movable clamp portion. A first shaft attachment portion is disposed at an end of the rod portion on the +Z-axis side. The fixed member includes a fixed clamp portion having a fixed clamping surface formed at a position on the negative Z-axis side facing the movable clamping surface, a main body portion having a predetermined length extending in the positive Z-axis direction from the surface of the fixed clamp portion opposite to the fixed clamping surface, and a rod guide portion located on the side of the fixed clamp portion or the main body portion and having a guide hole penetrating in the Z-axis direction, wherein the rod portion is inserted into the guide hole and the rod portion is slidably supported in the positive and negative Z-axis directions. A second shaft mounting portion is disposed at a position extending the axis of the rod portion or in the vicinity thereof at the end portion of the main body portion on the positive Z-axis side. The first link member includes a link main body portion having one end rotatably connected to the first shaft mounting portion, and an operation lever extending from the other end of the link main body portion. One end of the second link member is rotatably connected to the second shaft mounting portion, and the other end is rotatably connected to a third shaft mounting portion disposed at a position closer to the operation lever than the second shaft mounting portion of the first link member. When the operation lever is operated to tilt the link main body portion in a direction intersecting the Z-axis, the second link member and the movable member are displaced, and the movable clamping surface moves in the negative Z-axis direction. When the end portions of the bolt-fixed upper main column member and the lower main column member are disposed between the fixed clamping surface and the movable clamping surface, and the operation lever is operated to lift the link main body portion in the positive Z-axis direction, the second link member and the movable member are displaced, and the movable clamping surface moves in the positive Z-axis direction. When the third shaft mounting portion reaches a position extending the axis of the rod portion or in the vicinity thereof, the second link member is locked to the component of the second shaft mounting portion, and the position of the movable clamping surface with respect to the fixed clamping surface is fixed. A clamp jig, characterized in that when the operation lever is operated to tilt the link main body portion in a direction intersecting the Z-axis, the fixing of the position of the movable clamping surface is released. Claim 8 A tower in which an upper side segment and a lower side segment are connected by fixing an upper main column member, which is a component of the upper side segment, and a lower main column member, which is a component of the lower side segment, to each other. The upper main column member and the lower main column member are steel pipes filled with a filler for reinforcement inside a cylindrical main body portion, with an outward flange portion integrally formed at the open end of the cylindrical main body portion. In a tower dismantling method for dismantling the tower in which the upper side segment and the lower side segment are connected by facing and fixing the flange portions to each other by separating the upper side segment from the lower side segment, An end closing jig preparation step of preparing an end closing jig including a detachable base for the upper main column member, a plate-shaped shutter formed to be able to close the open end of the upper main column member, a shutter support mechanism attached to the base for pivotally supporting an end of the shutter and enabling the shutter to move from a position closing the open end to an open position, and a biasing means attached to the base for biasing the shutter toward a position closing the open end; An end closing jig mounting step of fixing the base of the end closing jig to the upper main column member, moving the shutter to a position opening the open end against the biasing force of the biasing means, and locking an end of the shutter to an outer peripheral surface of the flange portion of the lower main column member; A suspension wire connection step of connecting a suspension wire provided on a lifting means to the upper side segment; A fixing release step of releasing the fixing between the flange portions of the upper main column member and the lower main column member after the suspension wire connection step; A tower dismantling method characterized by comprising a lifting and removing step of lifting and removing the upper side segment with the lifting means after the end closing jig mounting step and the fixing release step.

9. A tower in which an upper side segment and a lower side segment are connected by fixing an upper main column member, which is a component of the upper side segment, and a lower main column member, which is a component of the lower side segment, to each other. The upper main column member and the lower main column member are steel pipes filled with a filler for reinforcement inside a cylindrical main body portion, with an outward flange portion integrally formed at an opening end of the cylindrical main body portion. An end closing jig used when disassembling the tower in which the upper side segment and the lower side segment are connected by facing and fixing the flange portions to each other by separating the upper side segment from the lower side segment, comprising a base detachably attached to the upper main column member, a plate-shaped shutter formed to have a size capable of closing the opening end of the upper main column member, a shutter support mechanism attached to the base for pivotally supporting an end of the shutter and enabling the shutter to move from a position closing the opening end to an open position, and a biasing means attached to the base for biasing the shutter toward a position closing the opening end. When attached to the tower before disassembly, the base is fixed to the upper main column member, the shutter is moved to a position opening the opening end against the biasing of the biasing means, and the end of the shutter is locked to the outer peripheral surface of the flange portion of the lower main column member for attachment. An end closing jig, characterized in that when the upper side segment is separated from the lower side segment, the locking of the end of the shutter is released, and the shutter is automatically moved to a position closing the opening end of the upper main column member by the biasing of the biasing means.

10. The end closing jig according to claim 9, wherein the shutter support mechanism includes a stopper member that holds the shutter, which has moved by being biased by the biasing means after the upper side segment is separated from the lower side segment, in a position closing the opening end of the upper main column member.

11. A tower has an upper segment and a lower segment. A plurality of bolt holes are provided at the ends of an upper main column member, which is a component of the upper segment, and at the ends of a lower main column member, which is a component of the lower segment. By horizontally connecting the corresponding bolt holes and passing a horizontal bolt through them, and bolt-fixing the ends of the upper main column member and the lower main column member to each other, the upper segment and the lower segment are connected. In a tower dismantling method of dismantling the tower by separating the upper segment from the lower segment, a temporary fixing jig preparation step of preparing a temporary fixing jig including a body member having first and second side surfaces that intersect and are continuous with each other, and a movable pin having a predetermined length attached to the body member, the base end portion of which is pivotally supported near the first side surface of the body member so as to be swingable, and the insertion portion on the opposite side of the base end portion being displaceable in a state of protruding outward from the first side surface; a temporary fixing jig mounting step of removing the horizontal bolt, inserting the insertion portion of the movable pin of the temporary fixing jig into the bolt hole that is horizontally communicated after the horizontal bolt is removed, bringing the first side surface of the body member into contact with the peripheral edge of the bolt hole, and temporarily fixing the upper main column member and the lower main column member with the temporary fixing jig; a suspension wire connection step of connecting a suspension wire provided on a lifting means to the upper segment; a temporary fixing jig removal step of, after the temporary fixing jig mounting step, performing an operation of pulling a specific portion of the body member of the temporary fixing jig, and obliquely separating the first side surface from the peripheral edge of the bolt hole with the corner where the first and second side surfaces intersect as a fulcrum, thereby pulling out the insertion portion of the movable pin from the bolt hole and releasing the temporary fixing of the upper main column member to the lower main column member; a lifting and removing step of lifting and removing the upper segment with the lifting means after the suspension wire connection step and the temporary fixing jig removal step. The tower dismantling method is characterized by comprising these steps.

12. The tower dismantling method according to claim 11, wherein after the suspension wire connection step, the upper main column member and the lower main column member are temporarily fixed by the temporary fixing jig, and in a state where the upper segment is rotatable about the movable pin of the temporary fixing jig, the upper segment is slightly lifted with the lifting means to confirm the weight of the upper segment, and a weight confirmation step is performed.

13. A step that is performed before the temporary fixing jig mounting step or in parallel with the temporary fixing jig mounting step, and before removing the horizontal bolt, a wedge member mounting step of mounting a wedge member for preventing misalignment between the bolt hole of the upper main column member and the bolt hole of the lower main column member in the gap between the end of the upper main column member and the end of the lower main column member. The tower dismantling method according to claim 11 or 12.

14. A temporary fixing jig used when disassembling a tower having an upper segment and a lower segment, in which a plurality of bolt holes are provided at the end of an upper main column member that is a component of the upper segment and at the end of a lower main column member that is a component of the lower segment, respectively, and the horizontal bolts are passed through by communicating the bolt holes with each other in the horizontal direction, and the ends of the upper main column member and the lower main column member are bolt-fixed to connect the upper segment and the lower segment. The temporary fixing jig is configured as follows: A main body member having first and second side surfaces that intersect and are continuous with each other, and a pin having a predetermined length attached to the main body member, the base end portion of which is pivotally supported near the first side surface of the main body member so as to be swingable, and the insertion portion on the side opposite to the base end portion is a movable pin that is displaceable in a state of protruding outward from the first side surface. Remove the horizontal bolt, insert the insertion portion of the movable pin into the bolt hole that is horizontally communicated after the horizontal bolt is removed, and bring the first side surface of the main body member into contact with the peripheral edge of one of the bolt holes, whereby the upper main column member and the lower main column member are temporarily fixed. In this temporarily fixed state, an operation of pulling a specific portion of the main body member is performed, and by obliquely separating the first side surface from the peripheral edge of the bolt hole with the corner portion where the first and second side surfaces intersect as a fulcrum, the insertion portion of the movable pin is pulled out of the bolt hole, and the temporary fixing between the upper main column member and the lower main column member is released. A temporary fixing jig characterized by this.

15. The movable pin is pivotally supported so as to be swingable with respect to the main body member and is supported in a swivel type that is rotatable around its own central axis. The main body member is provided with a magnet that attracts or adsorbs the peripheral edge of the bolt hole in a state of being in contact with the peripheral edge of the bolt hole to suppress displacement of the main body member. The temporary fixing jig according to claim 14.

16. A tower in which an upper segment and a lower segment are connected by fixing an upper main column member, which is a component of the upper segment, and a lower main column member, which is a component of the lower segment, to each other. The upper main column member and the lower main column member are members in which an outward flange portion is integrally formed at an opening end of a cylindrical main body portion. Bolt holes are respectively provided in the flange portions, and horizontal bolts are passed through by horizontally communicating the bolt holes with each other, and the flange portions are bolted to each other. In a tower dismantling method for dismantling the tower in which the upper segment and the lower segment are connected by separating the upper segment from the lower segment, A guide wire device preparation step of preparing a guide wire provided with an annular portion at its tip, a pulling device for pulling the guide wire, a main body portion fixed to the upper main column member, and on one side surface of the main body portion, two locking plates facing each other are erected, and an insertion hole is provided inside each of the two locking plates and communicates with each other. A Y-shaped fitting, a wire locking pin member having a base portion having a size that cannot pass through the insertion hole of the locking plate and a locking pin portion having a thickness that can pass through, and a locking pin retaining member that can be attached to and detached from the tip portion of the locking pin portion. A guide wire device installation step of fixing the main body portion of the Y-shaped fitting to the upper main column member, arranging the annular portion of the guide wire between the two locking plates, and passing the locking pin portion of the wire locking pin member through the insertion hole of one of the locking plates, the annular portion of the guide wire, and the insertion hole of the other locking plate in sequence, and attaching the locking pin retaining member to the tip portion of the locking pin portion protruding from the insertion hole of the other locking plate to connect the guide wire to the Y-shaped fitting, attaching the pulling device to the lower main column member, operating the pulling device to pull the guide wire, and energizing the flange portion of the upper main column member in a direction in which it is pressed against the flange portion of the lower main column member. A clamp jig preparation step of preparing a detachable clamp jig that clamps an object with two clamping surfaces. A clamp jig mounting step of clamping the flange portions of the upper main column member and the lower main column member with the clamp jig. After the guide wire device installation step and the clamp jig mounting step, a clamp jig removal step of removing the horizontal bolt and further removing the clamp jig to make the upper main column member and the lower main column member temporarily fixed by the guide wire device; A suspension wire connection step of connecting a suspension wire provided on a lifting means to the upper segment; after the clamp jig removal step and the suspension wire connection step, the flange portions of the upper main column member and the lower main column member are positioned by the biasing of the guide wire device, and the upper segment is rotatable about the axis of the position of the flange portion. A weight confirmation step of slightly lifting the upper segment with the lifting means to confirm the weight of the upper segment; after the weight confirmation step, removing the retaining pin portion retaining member of the guide wire device and pulling out the retaining pin portion of the wire retaining pin member from the Y-shaped fitting to separate the guide wire from the Y-shaped fitting. A guide wire removal step; A tower dismantling method characterized by performing a lifting and removing step of lifting and removing the upper segment with the lifting means after the guide wire removal step.

17. The tower dismantling method according to claim 16, wherein the upper main column member and the lower main column member are steel pipe members filled with a reinforcing filler inside the cylindrical main body portion.

18. An end closing jig preparation step of preparing an end closing jig including a detachable base on the upper main column member, a plate-shaped shutter formed to be able to close the open end of the upper main column member, a shutter support mechanism attached to the base to pivotally support an end of the shutter and enable the shutter to move from a position closing the open end to an open position, and a biasing means attached to the base to bias the shutter toward a position closing the open end; Before performing the clamp jig removal step, a step of fixing the base of the end closing jig to the upper main column member, moving the shutter to a position opening the open end against the biasing of the biasing means, and locking an end of the shutter to an outer peripheral surface of the flange portion of the lower main column member. The tower dismantling method according to claim 17.

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