Pillar holder, pillar lifting jig, and pillar lifting method

Abstract

To provide a column holding tool that is easy to be mounted onto a column and with which a column can be stably suspended.SOLUTION: A column holding tool 10 is connected to a lifting device C1 and is used to lift a column P1. The column holding tool 10 includes a pair of arm members 11 connected to the lifting device C1 and provided at positions laterally sandwiching the column P1 and a movable member 12 that is provided at a position that connects the pair of arm members 11 and covers the column P1 sideways. The movable member 12 can move to switch the pair of arm members 11 between a separating position where the column P1 is separated in the lateral position of the column P1 and a clamping position where the column P1 is clamped to be moved from the separating position toward the column P1.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a pole holder, a pole lifting jig, and a pole lifting method, and more particularly to a pole holder, a pole lifting jig, and a pole lifting method that are connected to a lifting device and used when lifting a pole. [Background technology]

[0002] BACKGROUND ART Conventionally, in the lifting work of a column, a method of lifting the top of the column (column capital part) by a lifting device such as a crane has been generally used. For example, in the lifting method described in Patent Document 1, a frame-shaped head is placed on the top of a pillar, and a metal fitting connected to the bottom end of the head via a wire is fixed to the bottom of the pillar, and then the pillar is erected using a lifting device, and the pillar is then lifted. A pillar lifting jig has been proposed that includes such a frame-shaped head, wire, and metal fitting as its components. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 6-272386 Summary of the Invention [Problem to be solved by the invention]

[0004] However, with this method, it was necessary to adjust the length of the pillar hoisting jig depending on the length of the pillar. Specifically, after placing a frame-shaped head on the capital part of the pillar, a metal fitting was fixed to the bottom of the pillar, and when fixing the metal fitting, it was necessary to adjust the length of the wire and adjust the position of the metal fitting. This increased the work time and could reduce work efficiency. Furthermore, if the column head has an accessory such as a gusset plate, it is necessary to avoid interference between the accessory and the head, so the head member must be machined (for example, slit) to match the shape of the accessory. Furthermore, depending on the position and size of the accessories attached to the column capital, the head may not fit deeply into the column capital, causing the head to come off the column capital, which could make it impossible to stably lift the column using the column lifting jig.

[0005] The present invention has been made in consideration of the above-mentioned problems, and an object of the present invention is to provide a pillar holder, a pillar lifting jig, and a pillar lifting method that are easy to attach to a pillar and can stably lift the pillar. [Means for solving the problem]

[0006] The above problem is solved by a pole holder according to the present invention, which is connected to a lifting device and used when lifting a pole, and which comprises a pair of arm members connected to the lifting device and positioned to sandwich the pole from the sides, and a movable member connecting the pair of arm members and positioned to cover the pole from the sides, and which is movable so that the pair of arm members can be switched between a spaced position where they are spaced apart from the pole at positions to the sides of the pole, and a clamping position where they are moved from the spaced position towards the pole to clamp the pole.

[0007] With the above-mentioned pole holder, the pair of arm members can be switched between a separated position and a clamping position, and the pair of arm members are configured to clamp the pole from the sides, so that the pole holder can be positioned in a position that avoids interference with the accessory member (gusset plate) attached to the pole capital part. Therefore, the total length of the pole holder can be kept constant regardless of the length of the pole, making it easy to adjust the position of the pole holder. Furthermore, because the positions of the pair of arm members are adjustable, the pole holder can be inserted from the upper end without interfering with the accessory member attached to the capital part of the pole, eliminating the need to process the pole holder to fit the shape of the accessory member. Furthermore, because the pole can be clamped from the side at the lower position of the accessory member, the pole holder can be prevented from slipping out upward and becoming detached, allowing the pole to be suspending stably. Therefore, the pole holder can prevent the pole from falling over. That is, the pole holder described above can be easily attached to a pole and can stably lift the pole.

[0008] In the pole holder, the movable member may switch the pair of arm members from the separated position to the clamping position in accordance with the operation of lifting the pole. In this way, after the pole holder is inserted into the pole from the top end and positioned to cover the side, the movable member moves in response to the action of lifting the pole, and the pair of arm members can clamp the pole. In other words, the pole can be switched from the separated position to the clamping position simply by the action of lifting the pole, improving work efficiency.

[0009] Furthermore, in the above-mentioned column holder, the movable member rotates around an axis extending in a direction intersecting the direction in which the pair of arm members face each other, and the pair of arm members are switched between the separated position and the clamping position in accordance with the rotational movement of the movable member. In this way, the pair of arm members can be switched between the separated position and the clamping position by rotating the movable member connecting the pair of arm members, thereby making it possible to switch the positions of the pair of arm members with a simple configuration.

[0010] Furthermore, the pole holder may further comprise a position holding member provided on the arm member or the movable member, for holding the arm member in the separated position. For example, when a pole holder is lifted up by a lifting device to remove it from a pole, the pole holder is subjected to a force in the direction of clamping the arm member, due to the force of being pulled upward by the lifting device and a force of being pulled downward by the pole holder's own weight (movable member). Therefore, by providing a position-retaining member as described above, the pole holder is held in the separated position. Therefore, when removing the pole holder from the pole, the movable member does not rotate unexpectedly, and the pole holder removal work can be carried out stably.

[0011] Furthermore, in the above-mentioned pillar holder, at least one of the arm members is provided with a predetermined distance therebetween, and has a pair of support members that protrude from the at least one arm member toward the pillar and are provided at positions sandwiching the pillar from lateral positions different from those of the pair of arm members, and the pair of support members support the pillar from the sides when the pair of arm members are in the clamping position. This allows the pair of arm members to support the pillar by sandwiching it from a lateral position different from the direction in which the pillar is held between them, thereby further reducing the lateral sway of the lifted pillar and enabling the pillar to be held more stably.

[0012] The above problem can also be solved by a pillar lifting jig comprising the above-mentioned pillar holder, a fixing member connected to the lower end of the pillar holder and extending in the vertical direction, and a fixing member connected to the lower end of the fixing member and fixing the pillar, wherein the pillar holder holds the upper part of the pillar and the fixing member fixes the lower part of the pillar, and the pillar holder is pulled upward by the lifting device and pulled downward by the fixing member and the fixing member, causing the movable member to move so as to switch the pair of arm members from the separated position to the clamping position. In this way, the force pulling the movable member upward by the lifting device and the force pulling the movable member downward by the fixing member and fixing fixture act on the movable member, increasing the force with which the pole holder clamps the pole, allowing the pole to be hoisted more stably.

[0013] The above problem can also be solved by a method for lifting a column using the above-mentioned column holder, comprising a first step of inserting the column holder into the column from the upper end thereof and arranging the column holder in a position where it clamps the column from the side, and a second step of lifting the column using the lifting device and the column holder, wherein in the first step, the column holder in the separated position is inserted from the upper end of the column so as not to interfere with an accessory member provided at the column capital part of the column, and the column holder is arranged in a position where it clamps the column from the side, and in the second step, as the column is lifted, the column holder in the separated position is switched to the clamping position, and the column is lifted in a state where it is clamped by the column holder. According to the above configuration, the device can be easily attached to a pillar and can be stably hung from the pillar. [Effects of the Invention]

[0014] The column holder, column lifting jig, and column lifting method of the present invention can provide a column holder, column lifting jig, and column lifting method that are easy to attach to a column and can stably lift the column. [Brief explanation of the drawings]

[0015] [Figure 1] FIG. 2 is a perspective view of the pillar suspension jig of the present embodiment, showing the pillar suspension jig attached to a pillar. [Figure 2] FIG. 10 is a perspective view of a column holder of the column hanging jig. [Figure 3A] FIG. 10 is a front view of the pole holder showing the pole holder in a spaced position. [Figure 3B] FIG. 10 is a diagram showing the clamping position of the pole holder. [Figure 4] FIG. 10 is a perspective view of a fixing device of the column suspension jig. [Figure 5A] FIG. 10 is a front view of the fixture, showing the state before the fixture is fixed to the pillar. [Figure 5B] FIG. 10 is a diagram showing the state in which the fixture is fixed to the pillar. [Figure 6A] This is a diagram showing the state before the pillars are erected. [Figure 6B] This is a diagram showing the state in which the pillars are being erected. [Figure 6C] FIG. 10 is a diagram showing the state in which the pillar is lifted. [Figure 6D] FIG. 10 is a diagram showing the state in which the pillar is erected and fixed to the foundation. DETAILED DESCRIPTION OF THE INVENTION

[0016] 1 to 6D, a column suspension jig 1 according to one embodiment of the present invention (hereinafter referred to as the present embodiment) will be described. In the following description, as shown by the arrow in Fig. 1, the vertical direction refers to the vertical direction when the column suspension jig 1 is attached to the steel column P1 in an upright state. The horizontal direction refers to the width direction of the steel column P1 in an upright state. The outside and inside are defined based on the steel column P1. That is, the direction approaching the center of the steel column P1 is defined as the "inward direction," and the direction away from it is defined as the "outward direction."

[0017] <Column hanging jig> As shown in FIGS. 1 to 6D, the column lifting jig 1 is connected to a crane C1 (lifting device) and erects and lifts the steel column P1 together with the crane C1. More specifically, as shown in Figures 6A to 6C, the column lifting jig 1 is used to erect a steel column P1 used in the skeleton of a building from a temporarily laid-down state, lift it up, and move it to a predetermined location. Also, as shown in Figure 6D, it is used to fix the steel column P1 in a predetermined position after it has been erected.

[0018] The column lifting jig 1 is mainly composed of a column holder 10 connected to a crane C1, a fixing member 20 connected to the lower end of the column holder 10, and a fixing member 30 connected to the lower end of the fixing member 20 to fix the steel column P1.

[0019] The steel column P1 has a rectangular cross section as shown in FIGS. The steel column P1 has a gusset plate P2 (accessory member) that is provided on the outer surface of the column capital P1a and protrudes outward from the column capital P1a. A column engaging portion P3 for setting up a work floor that serves as temporary scaffolding is attached to the outer surface of a column lower portion P1c, which is the lower portion of the steel column P1.

[0020] The column engaging portion P3 is formed by bending a plate-like member as shown in FIGS. 1, 4, 5A and 5B, and is attached to the outer surface of the steel column P1 by welding or the like. Two gaps extending in the vertical direction are formed between the column engaging portion P3 and the steel column P1. Specifically, two upper openings P3a are formed at the upper end of the column engaging portion P3, and two lower openings P3b are formed at the lower end of the column engaging portion P3. The work platform can be installed appropriately by inserting the locking claws of the work platform into the column engagement portion P3 (upper opening P3a). In addition, the steel column P1 can be lifted appropriately using the column engagement portion P3.

[0021] A column plate P4 is provided at the lower end of the steel column P1 for fixing to the foundation B. Through holes P5 are formed at the four corners of the column plate P4 to pass through anchor bolts A for fixing to the foundation B (see FIG. 6D).

[0022] <Column holder> As shown in FIGS. 1 to 3B, the column holder 10 is used when lifting a steel column P1, and holds the upper column part P1b, which is the upper part of the steel column P1, from the side. The column holder 10 comprises a pair of arm members 11 that clamp the steel column P1 from the sides, a pair of movable members 12 that connect the pair of arm members 11 and rotate, a rotation axis 13 that serves as the rotation center of the movable members 12, a pair of locking members 14 that connect to the crane C1, a pair of support members 15 that support the steel column P1 from the sides, and a position holding member 16 that holds the arm members 11 in a predetermined position. The column holder 10 is configured in a frame shape by a pair of arm members 11 and a pair of movable members 12, and is disposed so as to surround the column upper portion P1b of the steel column P1.

[0023] In the pole holder 10, the pair of arm members 11 can be switched between the "separate position" shown in FIG. 3A and the "clamping position" shown in FIG. 3B in accordance with the movable movement of the movable member 12. The "separate position" refers to a position where the pair of arm members 11 are spaced apart from the steel column P1 at positions to the sides of the steel column P1. The "clamping position" is a position where the pair of arm members 11 are moved inward from the "separate position" toward the steel column P1 to clamp the steel column P1.

[0024] The pole holder 10 is connected to the crane C1 via two connecting members C2 extending from the crane C1 and a connecting engagement member C3 connected to the lower ends of the connecting members C2. Although the connecting member C2 is a wire, it may be a connecting member such as a sling or a chain. Furthermore, the connecting engagement member C3 is a hook having a hook mechanism, but it may be a connecting engagement member such as a shackle.

[0025] As shown in FIGS. 1 to 3B, the arm member 11 is a long plate-like member that extends horizontally and sandwiches the steel column P1 from the sides. The pair of arm members 11a, 11b are provided at positions facing each other and are arranged so as to incline upward toward the inside of the steel column P1. When the pair of arm members 11a, 11b switch from the "separate position" shown in Figure 3A to the "clamping position" shown in Figure 3B, the upper ends of the pair of arm members 11a, 11b abut against the outer surface of the steel column P1 and hold the steel column P1. In addition, the above-mentioned "holding" includes not only the state in which the arm member 11 abuts against the steel column P1, but also the state in which the arm member 11 covers the steel column P1 with a small gap between the arm member 11 and the steel column P1.

[0026] As shown in FIGS. 1 to 3B, the movable member 12 is an X-shaped movable link that connects the pair of arm members 11a and 11b. The movable members 12 are provided at both longitudinal ends of the arm members 11a and 11b. That is, the pair of movable members 12 are arranged at a distance from each other in the longitudinal direction of the arm member 11, and connect the arm members 11a and 11b, respectively. Therefore, the pole holder 10 is arranged so that the arm members 11a, 11b and the pair of movable members 12 surround the outer periphery of the steel column P1.

[0027] In this embodiment, the pair of movable members 12 are connected to both ends of the arm member 11 in the longitudinal direction, but this is not particularly limited. For example, the movable member 12 may be connected to only one end of the arm member 11 in the longitudinal direction.

[0028] The movable member 12 has a first rotating member 12a and a second rotating member 12b as link members that change the positions of the pair of arm members 11a and 11b. The first rotating member 12a is a long, plate-like member that is attached to one longitudinal end of the arm member 11a. The first rotating member 12a extends from the one end of the arm member 11a toward the arm member 11b so as to incline downward. The second rotating member 12b is a long, plate-like member that is attached to one end of the arm member 11b in the longitudinal direction. The second rotating member 12b extends from the one end of the arm member 11b toward the arm member 11a so as to be inclined downward. Specifically, first rotating member 12a and second rotating member 12b intersect in the front view shown in FIGS. 3A and 3B.

[0029] First rotating member 12a and second rotating member 12b overlap each other and cross each other to form an X shape. That is, the central portion of first rotating member 12a and the central portion of second rotating member 12b are arranged to overlap each other, and rotating shaft 13 is attached to the central portions. The first rotating member 12a and the second rotating member 12b each have a fixing hole 12c formed at their lower longitudinal ends for connecting the fixing member 20. The fixing member 20 is connected to the lower end of the pole holder 10 using the fixing hole 12c. The other movable member 12 attached to the other end of the arm member 11 in the longitudinal direction has a similar configuration.

[0030] As shown in FIGS. 1 to 3B, the rotation shaft 13 is an axis that extends in the horizontal direction, specifically, in a direction that intersects (is perpendicular to) the direction in which the pair of arm members 11 face each other. The rotation shaft 13 rotatably connects the first rotation member 12a and the second rotation member 12b, which intersect with each other. That is, the movable member 12 rotates around the rotation shaft 13 to switch the pair of arm members 11 between the "separate position" shown in FIG. 3A and the "clamping position" shown in FIG. 3B.

[0031] As shown in FIGS. 1 to 3B, the locking member 14 connects the pole holder 10 to the crane C1 and is a plate-like member that is long in the vertical direction. The locking members 14a and 14b are provided at the center positions of the arm members 11a and 11b, respectively, and are arranged so as to incline downward from the arm members 11a and 11b toward the outside of the steel column P1. Specifically, the upper portion of locking member 14a is connected to the upper surface (outer surface) of arm member 11a at the center, and the upper portion of locking member 14b is connected to the upper surface of arm member 11b at the center. The upper ends of the locking members 14a and 14b are each formed with a connecting hole 14c for engaging with the connecting engaging member C3. The column holder 10 enables the steel column P1 to be hoisted by the crane C1 via the connecting member C2 by engaging the connecting engaging member C3 with the connecting hole 14c.

[0032] As shown in FIGS. 1 to 3B, the support member 15 is a support claw that clamps the steel column P1 from a lateral position different from that of the arm member 11, and has a first support member 15a and a second support member 15b.

[0033] 2, the first support members 15a are rectangular flat plate members that are provided on the left and right sides of the arm member 11a with a predetermined gap between them. The first support members 15a protrude toward the steel column P1 so as to be continuous with the upper end of the arm member 11a. Specifically, each of the pair of first support members 15a is inclined upward in the direction in which the arm member 11a is inclined. The pair of first support members 15a are provided at positions sandwiching the steel column P1 from the sides in the extending direction of the arm member 11a.

[0034] Similarly, the second support member 15b is a rectangular flat plate member that is provided as a pair on the arm member 11b with a predetermined gap between them. The second support member 15b projects continuously from the upper end of the arm member 11b while slanting upward toward the steel column P1. The pair of second support members 15b are provided at positions sandwiching the steel column P1 from the sides in the extending direction of the arm member 11b.

[0035] In this way, the pair of first support members 15a and the pair of second support members 15b are positioned to sandwich the steel column P1 from the sides, and their respective upper ends (ends on the steel column P1 side) support the steel column P1. In addition, the above-mentioned "support" includes not only the state in which the support member 15 abuts against the steel column P1, but also the state in which the support member 15 covers the steel column P1 with a small gap between the support member 15 and the steel column P1.

[0036] As shown in FIGS. 3A and 3B, the position holding member 16 holds the arm member 11 in the "separate position" shown in FIG. 3A. Specifically, the position-retaining member 16 has a metal plate 16a and a permanent magnet 16b that exerts a magnetic force on the metal plate 16a. Metal plate 16a is a plate member made of a ferromagnetic material such as iron, and is provided in the center portion of first rotating member 12a. Specifically, metal plate 16a is attached to the outer surface of first rotating member 12a and is located slightly above rotating shaft 13.

[0037] Permanent magnet 16b is a cylindrical member made of, for example, a neodymium magnet. Permanent magnet 16b is provided in the center of second rotating member 12b so as to face metal plate 16a in the "separate position" shown in Fig. 3A. Specifically, permanent magnet 16b is disposed in a recess (not shown) formed on the inner surface of second rotating member 12b, slightly below rotation axis 13 of second rotating member 12b.

[0038] In this way, the position at which the position-retaining member 16 is attached to the movable member 12 is a position where the first rotating member 12a and the second rotating member 12b overlap in the "separated position" shown in Figure 3A, and a position where the first rotating member 12a and the second rotating member 12b do not overlap in the "clamped position" shown in Figure 3B. The first rotating member 12a and the second rotating member 12b are disposed with a gap therebetween that is large enough to accommodate the position maintaining member 16 (metal plate 16a). Therefore, the position holding member 16 can hold the pair of arm members 11 in the "separate position" by attracting the permanent magnet 16b to the metal plate 16a.

[0039] The means for holding the arm members 11 in the "separated position" may be a holding means other than magnetic force by a permanent magnet. For example, the pole holder 10 may be provided with a biasing member that applies a biasing force to the pair of arm members 11 in directions that move them away from each other. For example, the pole holder 10 may be provided with a biasing member such as a coil spring that is hung between the upper end of the first rotating member 12a and the lower end of the second rotating member 12b. The biasing member biases the upper end of the first rotating member 12a and the lower end of the second rotating member 12b in a direction that brings them closer to each other in the vertical direction. In other words, the pole holder 10 is provided with the elastic member, so that the arm member 11 can be held in the separated position.

[0040] Furthermore, the pole holder 10 may be provided with a means for holding the arm member 11 in the "separate position" on the arm member 11 rather than on the movable member 12. Specifically, the pole holder 10 may be provided with a biasing member such as a coil spring that is hung between the end of the arm member 11a in the extension direction and the end of the arm member 11b in the extension direction. The biasing member biases the arm members 11a and 11b in directions away from each other. In other words, the pole holder 10 is provided with the above-mentioned biasing member, so that the arm member 11 can be held in the separated position.

[0041] <Fixing material> The fixing member 20 is used when lifting the steel column P1, and connects the lower end of the column holder 10 (movable member 12) and the upper end of the fixing device 30. As shown in FIG. 1, the fixing member 20 includes a wire 21, an upper engaging portion 22 connected to the pole holder 10, and a lower engaging portion 23 connected to the fixing device 30. The wire 21 is set to a length that prevents the column holder 10 from coming off the column capital P1a of the steel column P1 when the steel column P1 is erected. The wire 21 may be another fixing member such as a sling or a chain.

[0042] The upper engagement portion 22 is connected to a fixing hole 12 c formed in the lower end portion of the movable member 12 . The lower engaging portion 23 is provided at the lower end of the wire 21 and is connected to the upper end of the fixture 30 . The upper engaging portion 22 and the lower engaging portion 23 are, for example, hooks having a hook mechanism, but may be other engaging members such as shackles.

[0043] <Fixing fixture> The fixture 30 detachably fixes the column suspension jig 1 to column engagement parts P3 located on opposite sides of the steel column P1. As shown in Figures 1, 4, 5A and 5B, the fixing device 30 comprises a wire fixing portion 31 that connects to the wire 21 extending from the column holder 10, and a column fixing portion 32 that fixes the steel column P1.

[0044] The wire fixing portion 31 is for hooking the lower engaging portion 23 and is fixed to the upper end of the column fixing portion 32. The column fixing portion 32 is a jig that is detachably fixed to the column engagement portion P3 of the steel column P1. As shown in Figures 4, 5A and 5B, the pillar fixing portion 32 has a base 32a to which the wire fixing portion 31 is attached, a side portion 32b connected to the base 32a, a first locking piece 32c that engages with the pillar engaging portion P3 from below, a second locking piece 32d that engages with the pillar engaging portion P3 from above, an operating portion 32e that moves the second locking piece 32d, and a support portion 32f that supports the second locking piece 32d.

[0045] The base 32a is a metal member formed in a rectangular plate shape, and fixes the wire fixing portion 31 thereto. The wire fixing portion 31 may be attached to the base portion 32a so as to be rotatable about a central axis in the vertical direction. In this way, even if the wire 21 is twisted after the lower engagement portion 23 is engaged, the wire fixing portion 31 can be rotated appropriately to eliminate the twist.

[0046] The side portions 32b are trapezoidal metal members that extend downward from both ends of the base portion 32a. The first locking piece 32c is provided at a position separated by a predetermined distance from the base portion 32a by the side portion 32b. The upper end of the first locking piece 32c is inserted into the lower opening P3b of the pillar engagement portion P3. The second locking piece 32d is provided at a position facing the first locking piece 32c across the pillar engagement portion P3. The second locking piece 32d is connected to the operating portion 32e and the support portion 32f and is movable up and down relative to the base portion 32a. The lower end of the second locking piece 32d can be inserted into the upper opening P3a of the pillar engagement portion P3.

[0047] As shown in FIG. 5B, the vertical length of the lower first locking piece 32c is longer than the vertical length of the upper second locking piece 32d. The locking piece inserted into the column engaging portion P3 from below is formed long, so that the first locking piece 32c is less likely to come off the lower opening P3b of the column engaging portion P3, thereby stably attaching the column fixing portion 32 to the column engaging portion P3 of the steel column P1.

[0048] The operating portion 32e is screwed into a screw hole formed in the base portion 32a and supports one end of the second locking piece 32d. The operating portion 32e is rotated by a tool such as a wrench to move the second locking piece 32d up and down. The support portion 32f is inserted into a loose hole formed in the base portion 32a and supports the other end portion of the second locking piece 32d.

[0049] When attaching the fastener 30 to the steel column P1, the worker rotates the operating part 32e of the column fixing part 32 to push the second locking piece 32d upward (in the direction of arrow III in FIG. 5A) as shown in FIG. 5A.

[0050] After placing the pillar engagement portion P3 between the first locking piece 32c and the second locking piece 32d, the worker rotates the operating portion 32e using a tool such as a wrench to move the second locking piece 32d downward (in the direction of arrow IV in Figure 5). In this way, the worker can fix the fastener 30 to the steel column P1 by inserting the first locking piece 32c and the second locking piece 32d of the column fixing portion 32 into the column engagement portion P3.

[0051] <How to lift the pillar> Next, a method for hoisting a pillar using the pillar hoisting jig 1 will be described with reference to FIGS. 6A to 6D. This method includes at least a "first step" of placing the column hoisting jig 1 on the steel column P1 (Fig. 6A), a "second step" of hoisting the steel column P1 using a crane C1 and a column holder 10 (Figs. 6B and 6C), a "third step" of fixing the steel column P1 to the foundation B (Fig. 6D), and a "fourth step" of removing the column hoisting jig 1 from the steel column P1. These steps will be explained in detail below. It should be noted that other steps involved in the lifting and installation of the steel column P1 will not be described here.

[0052] In the "first step," as shown in Figure 6A, a worker inserts the pole holder 10 into the steel column P1 and places the pole holder 10 in a position where it will clamp the steel column P1 from the sides. The pole holder 10 is attached to the steel column P1, which is temporarily placed on a sleeper S in a horizontal state.

[0053] Before the column holder 10 is attached to the steel column P1, the movable member 12 is rotated to position the pair of arm members 11 in the "separate position" shown in Figure 3B. At this time, the pair of arm members 11 are held in the "separate position" by the position holding member 16. With the column holder 10 held in this "separate position", the column holder 10 is inserted so as to fit over the upper end of the column capital part P1a, and attached to the outer periphery of the column upper part P1b.

[0054] At this time, the column holder 10 is inserted while avoiding the gusset plate P2 provided on the column capital part P1a so as not to interfere with the gusset plate P2. As shown in FIG. 3A, the distance by which the column holder 10 in the "separated position" is separated, specifically, the distance W1 between the inward end of the first support member 15a and the inward end of the second support member 15b, is longer than the distance W2 by which the gusset plate P2 protrudes outward. Therefore, when the column holder 10 in the "separate position" is inserted from the upper end of the column capital part P1a, it is possible to avoid interference with the gusset plate P2.

[0055] After the pole holder 10 is attached, the pole holder 10 and the fixing device 30 are connected by the fixing member 20. Then, following the procedure described above, the fixing device 30 is attached to the pole engaging part P3 that will be located below the steel column P1 when it is erected. Next, the column holder 10 and the crane C1 are connected by the connecting member C2.

[0056] In the "second step," as shown in Figures 6B and 6C, a worker operates the crane C1 and lifts up the steel column P1 using the column holder 10. As shown in Figure 6B, once the column holder 10 is lifted up by the crane C1, the steel column P1 gradually stands up. The crane C1 continues to lift up the steel column P1 until it is erected.

[0057] At this time, as shown in Figure 3B, the pair of locking members 14 of the pole holder 10 are pulled upward by the two connecting members C2, and move upward and inward (in the direction of arrow I in Figure 3B). Also, the lower ends of the pair of movable members 12 of the pole holder 10 are pulled downward by the fixing member 20 and the fixing device 30, and move downward and inward (in the direction of arrow II in Figure 3B). By doing so, the pair of arm members 11 move closer to each other and switch from the "separate position" to the "clamping position."

[0058] In this way, as the crane C1 lifts the steel column P1, the column holder 10 switches from the "separate position" to the "clamping position," and the arm member 11 can lift the steel column P1 while clamping it. At this time, as the steel column P1 changes from a lying state to an upright state, the force pulling the fixed member 20 downward via the fixing device 30 due to the weight of the steel column P1 gradually increases. The force pulling the movable member 12 connected to the fixed member 20 downward by the fixing member 20 and the fixing device 30 gradually increases. Therefore, the force with which the arm member 11 clamps the steel column P1 gradually increases.

[0059] After the steel column P1 is erected, as shown in FIG. 6C, the steel column P1 is further lifted upward (in the direction of arrow V in FIG. 6C) by a crane C1 and moved to the location where the steel column P1 is to be installed.

[0060] In the "third step," as shown in FIG. 6D, a worker lowers the steel column P1 and fixes it to the foundation B by inserting the anchor bolt A into the through-hole P5 of the column plate P4 of the steel column P1.

[0061] In this way, the column hanging jig 1 can hang the steel column P1 in a nearly vertical state, thereby preventing the column plate P4 from damaging the threads of the anchor bolt A. Furthermore, even if the column engaging portion P3 comes off the steel column P1 when suspending the steel column P1, or even if the fixing device 30 comes off the column engaging portion P3, the steel column P1 is clamped by the column holder 10. Therefore, the steel column P1 can be prevented from suddenly falling.

[0062] In the "fourth step", a worker removes the column hanging jig 1 from the steel column P1. First, the worker operates the column fixing portion 32 of the fixing device 30 to remove the fixing device 30 from the column engagement portion P3 of the steel column P1. Specifically, the worker rotates the operating portion 32e using a tool such as a wrench to move the second locking piece 32d upward, thereby disengaging the second locking piece 32d from the upper opening P3a. In this way, the worker can move the second locking piece 32d of the fixing device 30 up and down simply by rotating the operating part 32e, so that the fixing device 30 can be easily attached and detached.

[0063] Thereafter, the connection between the lower engaging portion 23 of the fixed member 20 and the fixing device 30 is released. At this time, the pole holder 10 is held in the "clamping position" by the force of the pair of locking members 14 being pulled upward by the two connecting members C2 and the weight of the movable member 12 and the fixed member 20. Therefore, the worker moves the arm members 11 from the "clamping position" to the "separated position" by pulling them in the direction separating them from each other. Specifically, the worker pulls downward the gripping parts (not shown) attached to the lower ends of the pair of locking members 14. The pair of arm members 11 that have been moved to the "separate position" are again held in the "separate position" by the position holding member 16.

[0064] As a means for returning the arm member 11 to the "separate position," a gripping portion may be provided at the lower end of the movable member 12, rather than at the locking member 14. In this case, the operator moves the arm member 11 from the "clamping position" to the "separate position" by pulling the gripping portion upward.

[0065] After the column holder 10 is held in the "separate position", the column holder 10 is further lifted up by the crane C1 and removed from the upper end of the steel column P1. The column holder 10 in the "separate position" can be removed from the steel column P1 simply by lifting it upward with the crane C1 (in the direction of arrow VI in Figure 6D). At this time, since the column holder 10 is held in the "separated position" by the positioning member 16, it can be removed from the steel column P1 so as not to interfere with the gusset plate P2 provided at the column capital P1a.

[0066] The above-described method for lifting and installing a column allows the column lifting jig 1 to be easily attached and detached to the steel column P1, and also prevents the steel column P1 from tipping over, allowing the steel column P1 to be stably lifted.

[0067] <Other embodiments> The pole hanging jig of the present invention is not limited to the above-described embodiment. For example, as shown in Fig. 1, the column hoisting jig 1 is configured to fix and hoist a steel column P1 using a column holder 10, a fixing member 20, and a fixing member 30. However, it is not limited to this, and the work of hoisting the steel column P1 may be performed using the column holder 10 without using the fixing member 20 and the fixing member 30. This allows the lifting work of the steel column P1 to be carried out with a simpler structure.

[0068] Furthermore, the arm member 11 has a long plate-shaped end face as a portion that abuts against the steel column P1 and clamps the steel column P1. However, the present invention is not limited to this, and the shape of the arm member 11 may be shaped to conform to the outer surface of the steel column P1 so that the arm member 11 abuts against the outer surface of the steel column P1 and increases the area that clamps the steel column P1. Similarly, the support member 15 may also have an increased area that clamps the steel column P1. This increases the holding force of the column holder 10, allowing the steel column P1 to be held stably. Alternatively, the arm member 11 may be provided with an attachment having a shape that conforms to the outer surface of the steel column P1. This allows stable hanging of columns of any shape, such as a cylindrical column, in addition to the steel column P1 having a rectangular cross section.

[0069] Furthermore, the movable member 12 is configured such that both the first rotating member 12a and the second rotating member 12b rotate about the rotation axis 13. However, the present invention is not limited to this, and the first rotating member 12a and the second rotating member 12b may rotate relatively to each other.

[0070] Furthermore, the movable member 12 of the pole holder 10 is configured to switch the arm member 11 between the separated position and the clamping position by a rotational movement, but switching may be performed by means other than a rotational movement. Specifically, the movable member 12 may have a sliding member that moves the arm member 11 instead of the movable member 12, and a guide member that guides the arm member 11. In this case, the sliding member slides along the guide member, so that the pair of arm members 11 can be switched between the separated position and the clamping position. In this way, the arm member 11 is moved from the separated position to the clamping position simply by the action of lifting the steel column P1, thereby improving work efficiency.

[0071] Furthermore, the support member 15 of the pole holder 10 may be attached so that its fixed position relative to the arm member 11 can be changed in the longitudinal direction of the arm member 11. Alternatively, it may be attached so that it can move relative to the arm member 11 in the longitudinal direction of the arm member. In the former case, for example, the arm member 11 is provided with a plurality of attachment parts to which the support member 15 can be attached. The support member 15 is attached to the attachment parts at positions according to the size of the steel column P1, so that the steel column P1 can be suitably supported. In the latter case, for example, a guide portion that guides the support member 15 so that it can slide is provided on the arm member 11. The support member 15 slides to a position corresponding to the width direction of the steel column P1, thereby making it possible to suitably support the steel column P1. Therefore, even if the width directions of the columns are different, they can be supported from the sides in an appropriate manner.

[0072] Furthermore, in this embodiment, a steel frame column P1 has been described as an example, but the present invention is also suitable for suspending pillar-shaped objects with many protrusions, such as utility poles and scaffolding supports. Furthermore, the present invention is not limited to pillar-shaped objects, and is also suitable for suspending long objects that require vertical suspension, such as vertical furring strips, downspouts, standpipes, signboards, vertical rails, and reinforcing bars.

[0073] In addition, in this embodiment, an example has been given of a case in which an accessory member is provided on the column capital P1a of the steel column P1, but the column hanging jig 1 can also be used if the column capital P1a of the steel column P1 does not have an accessory member such as a gusset plate P2.

[0074] In the above embodiment, the pole holder, the pole lifting jig, and the pole lifting method according to the present invention have been mainly described. However, the above embodiment is merely an example for facilitating understanding of the present invention, and does not limit the present invention. The present invention can be modified and improved without departing from the spirit thereof, and the present invention naturally includes equivalents thereof. [Explanation of symbols]

[0075] 1 Pillar lifting jig 10 Pillar holder 11 (11a, 11b) Arm member 12 Movable parts 12a First rotating member 12b second rotating member 12c fixing hole 13 Rotating shaft (axis) 14(14a, 14b) Locking member 14c connection hole 15 Support member 15a first support member 15b second support member 16 Position-retaining member 16a Metal Plate 16b Permanent magnet 20 Fixing member 21 wires 22 Upper engagement portion 23 Lower engagement part 30 Fixtures 31 Wire fixing part 32 Pillar fixing part 32a base 32b Side 32c First locking piece 32d Second locking piece 32e Control unit 32f Support section P1 Steel column (pillar) P1a Column head P1b Pillar top (upper part) P1c Lower part of column (lower part) P2 Gusset plate (accessory) P3 pillar engagement part P3a upper opening P3b lower opening P4 Pillar Plate P5 through hole C1 Crane (lifting device) C2 connecting member C3 Connecting engagement member S sleeper B. Basics Anchor bolt

Claims

1. A pole holder connected to a lifting device and used to lift a pole, a pair of arm members connected to the lifting device and positioned to sandwich the pillar from the sides; a movable member that connects the pair of arm members and is provided at a position that covers the pillar from the side, The movable member is movable to switch the pair of arm members between a spaced position in which they are spaced apart from the pillar at a position to the side of the pillar, and a clamping position in which they are moved from the spaced position toward the pillar to clamp the pillar.

2. 2. The pole holder according to claim 1, wherein the movable member switches the pair of arm members from the separated position to the clamping position in accordance with the operation of lifting the pole.

3. The movable member is The pair of arm members rotate about an axis extending in a direction intersecting the direction in which the pair of arm members face each other, 3. A pole holder according to claim 1, wherein the pair of arm members are switched between the separated position and the clamping position in accordance with the rotational movement of the movable member.

4. 4. The pole holder according to claim 1, further comprising a position holding member provided on the arm member or the movable member, for holding the arm member at the separated position.

5. at least one of the arm members has a pair of support members that are provided at a predetermined interval, each of which protrudes from the at least one arm member toward the pillar, and which are provided at positions sandwiching the pillar from different lateral positions from the pair of arm members; 5. A pole holder according to claim 1, wherein the pair of support members support the pole from the sides when the pair of arm members are in the clamping position.

6. A pole suspension jig comprising: a pole holder according to any one of claims 1 to 5; a fixing member connected to a lower end of the pole holder and extending in the vertical direction; and a fixing device connected to the lower end of the fixing member and fixing the pole, the pole holder holds an upper portion of the pole; The fastener secures a lower portion of the column; A pillar lifting jig characterized in that the pillar holder is pulled upward by the lifting device and pulled downward by the fixing member and the fixing device, so that the movable member moves to switch the pair of arm members from the separated position to the clamping position.

7. A method for lifting a pole using the pole holder according to any one of claims 1 to 5, comprising: a first step of inserting the pole holder into the pole from the upper end of the pole and arranging the pole holder in a position where the pole is sandwiched from the sides; a second step of lifting the pole using the lifting device and the pole holder, In the first step, the pole holder in the separated position is inserted from the upper end of the pole so as not to interfere with the accessory member provided at the pole capital part of the pole, and the pole holder is arranged in a position to sandwich the pole from the side, In the second step, the pole holder in the separated position is switched to the clamping position in conjunction with the operation of lifting the pole, and the pole is lifted in a state in which the pole holder clamps the pole.

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