Mobile protection device and construction scaffolding dismantling method

Abstract

To provide a movable protective device capable of moving even a floor slab supported by a bridge pier in a bridge axis direction, and a construction scaffold demolition method for demolishing a scaffold by using the same.SOLUTION: A movable protective device of the present invention is a protective device which is installed on a floor slab of a bridge and is movable in a bridge axis direction and is equipped with upper carriage equipment which is placed on the floor slab, a lower floor surface structure which is disposed below the floor slab, and a main hanging member which hangs the lower floor surface structure. When a separation is created between the left floor structure and the right floor structure, the piers can pass through the separation created between the left floor structure and the right floor structure when the support beam material is moved in the bridge axis direction by the moving mechanism.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to technology related to protective work installed when dismantling scaffolding and the like used in bridge construction work, and more specifically, to a mobile protective device that can move in the axial direction of the bridge while avoiding bridge piers, and a construction scaffolding dismantling method that uses this device to dismantle scaffolding. [Background technology]

[0002] Bridge construction work is broadly divided into substructure work, such as abutments and piers, and superstructure work, which mainly involves constructing the deck, and superstructure work is generally carried out after the substructure work is completed. Normally, scaffolding (hereinafter, permanent scaffolding will be referred to as "construction scaffolding") is set up during superstructure work, and deck work, wall balustrade work, painting work, etc. are carried out using this construction scaffolding. Once deck work and wall balustrade work, which are the final stages of bridge construction work, are completed, the construction scaffolding is dismantled as no further work is required.

[0003] Dismantling scaffolding has been considered a difficult task due to the risk of workers falling or tools dropping. Up until now, careful safety management has been implemented, such as by establishing detailed work procedures and using safe construction machinery such as aerial work vehicles, but falls caused by personal misunderstandings or assumptions, or inexperience, cannot be completely avoided.

[0004] It is possible to set up scaffolding to dismantle the construction scaffolding (hereinafter, scaffolding for demolition will be referred to as "demolition scaffolding"), but in cases where the clearance is large, such as bridges erected over valleys, the scale of the demolition scaffolding would be enormous and this is not realistic. It is also possible to use a bridge inspection vehicle that is placed on the deck and has an arm that can be extended below the deck, but this significantly reduces work efficiency and does not provide sufficient security in terms of preventing workers from falling or falling objects.

[0005] When demolition scaffolding or aerial work vehicles cannot be used, protective work may be installed during the dismantling of construction scaffolding. The protective work installed below the construction scaffolding prevents workers from falling or tools from dropping. Since construction scaffolding is usually installed over almost the entire span, when protective work is used, it is necessary to install protective work over almost the entire span. However, installing protective work for the entire span at once is not realistic due to the high cost of materials (rent) and the costs of installation and dismantling. That said, while it is possible to reduce material costs by repeatedly installing partial protective work while proceeding in the bridge axis direction, it is not possible to reduce the costs of installation and dismantling.

[0006] Therefore, Patent Document 1 proposes a mobile protective structure that can be moved in the axial direction of the bridge. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Japanese Patent Application Publication No. 5-295712 Summary of the Invention [Problem to be solved by the invention]

[0008] According to the technology disclosed in Patent Document 1, the protective work moves in the axial direction of the bridge, so it is sufficient to install protective work on only a portion of the entire span, and there is no need to repeatedly install protective work for each section, which is advantageous because it allows costs such as material costs and installation to be reduced.

[0009] Incidentally, the main girder of a bridge is supported by abutments installed on both ends, and in many cases, depending on the span length, it is supported by a pier installed midway through the span, as shown in Figure 11. If the mobile protection work of Patent Document 1 is applied to a bridge with a pier midway through the span like this, the pier becomes a barrier and it is not possible to move in the axial direction of the bridge. In this case, the mobile protection work must be replaced every time the bridge passes a pier, or a separate mobile protection work must be installed for each span (abutment to pier, or pier to pier), but this results in a significant reduction in the advantage of reducing costs for materials and installation, etc.

[0010] The object of the present invention is to solve the problems of the prior art, namely, to provide a bridge supported by a pier. Bridge To provide a mobile protective device capable of moving in the axial direction of a bridge even if it is a deck slab, and a construction scaffolding dismantling method for dismantling the scaffolding by using the same. [Means for solving the problem]

[0011] The present invention is based on the idea that a lower floor structure is placed below the deck, and that this lower floor structure opens to the left and right when passing over a pier; it is an invention based on an unprecedented concept.

[0012] The mobile protection device of the present invention is a protection device that is installed on the deck of a bridge and can move in the bridge axial direction, and includes an upper bogie equipment placed on the deck, a lower floor structure arranged below the deck, and a main suspension member that suspends the lower floor structure. The upper bogie equipment includes a support beam arranged along the bridge axis perpendicular direction, a left winding device and a right winding device installed on the support beam, and a moving mechanism that moves the support beam in the bridge axis direction. The lower floor structure includes a left floor structure and a right floor structure, and the right end (center of the cross section) of the left floor structure and the left end (center of the cross section) of the right floor structure are separably connected by a connecting pin. The main suspension member includes a left main suspension member arranged on the left outer side of the deck (perpendicular to the bridge axis) and a right main suspension member arranged on the right outer side of the deck in the bridge axis perpendicular direction (perpendicular to the bridge axis). The upper end of the left main hanging member is fixed to part of the support beam protruding on the left outer side of the deck (perpendicular to the bridge axis), and the lower end of the left main hanging member is hinged to the left support point on the left floor structure. Similarly, the upper end of the right main hanging member is fixed to part of the support beam protruding on the right outer side of the deck (perpendicular to the bridge axis), and the lower end of the right main hanging member is hinged to the right support point on the right floor structure. The lower end of the left hanging rope hanging from the left winding device is connected to the left floor structure to the right of the left support point (perpendicular to the bridge axis), and the lower end of the right hanging rope hanging from the right winding device is connected to the right floor structure to the left of the right support point (perpendicular to the bridge axis). Then, after removing the connecting pin, when the left winding device winds out the left suspension rope, the left end (perpendicular to the bridge axis) of the left floor structure rises and the right end (perpendicular to the bridge axis) descends, and when the right winding device winds out the right suspension rope, the right end (perpendicular to the bridge axis) of the right floor structure rises and the left end (perpendicular to the bridge axis) descends, resulting in an "open state" where a gap has been created between the right end (perpendicular to the bridge axis) of the left floor structure and the left end (perpendicular to the bridge axis) of the right floor structure.In this open state, when the support beam material moves in the bridge axis direction by the moving mechanism, the pier can pass through the gap that has been created between the left and right floor structures.

[0013] The mobile protection device of the present invention may further include an upper intermediate connecting beam and a lower intermediate connecting beam. In this case, the left floor structure is a truss structure including an upper left connecting beam and a lower left connecting beam arranged in two stages, one above the other, in the direction perpendicular to the bridge axis, and the right floor structure is also a truss structure including an upper right connecting beam and a lower right connecting beam arranged in two stages, one above the other, in the direction perpendicular to the bridge axis. The upper left connecting beam and the upper intermediate connecting beam are separably connected by a connecting pin, and the upper right connecting beam and the upper intermediate connecting beam are separably connected by a connecting pin. Similarly, the lower left connecting beam and the lower intermediate connecting beam are separably connected by a connecting pin, and the lower right connecting beam and the lower intermediate connecting beam are separably connected by a connecting pin.

[0014] The mobile protection device of the present invention can also be configured so that the left weight is placed on the left floor structure and the right weight is placed on the right floor structure. The left weight should be placed to the left of the left support point (perpendicular to the bridge axis), and the right weight should be placed to the right of the right support point (perpendicular to the bridge axis).

[0015] The mobile protection device of the present invention can further include an expandable auxiliary suspension member. In this case, the main girder (the main girder of the bridge that supports the deck) and the lower deck structure are connected by this auxiliary suspension member. Therefore, the height of the lower deck structure can be adjusted by expanding and contracting the auxiliary suspension member.

[0016] The construction scaffolding dismantling method of the present invention is a method for dismantling a construction scaffolding (scaffolding installed when constructing a bridge) using the mobile protection device of the present invention, and is a method including an installation process, a relocation process, and a partial dismantling process. In the installation process, the upper bogie equipment is placed on the deck, the lower floor structure is placed below the deck, and the mobile protection device is installed on the deck so that the main suspension members suspend the lower floor structure. In the relocation process, the mobile protection device is moved together with the support beam members in the bridge axis direction by the moving mechanism, and in the partial dismantling process, the construction scaffolding within the range where the mobile protection device was placed after the movement is dismantled. Then, when the construction scaffolding in a predetermined section (in the bridge axis direction) is dismantled in the partial dismantling process, the relocation process is carried out again.

[0017] The scaffolding dismantling method of the present invention can also be a method further comprising an opening step. In this opening step, the connecting pin is removed, and the left suspension rope of the left winding device is unwound, and the right suspension rope of the right winding device is unwound to open the mobile protection device. In addition, in the relocation step when passing over the pier, the mobile protection device is moved in the bridge axis direction after being opened in the opening step.

[0018] The scaffolding dismantling method of the present invention can also be a method further comprising a restoration step, in which after passing through the pier in the relocation step, the left hoisting rope of the left winding device is wound up, and the right hoisting rope of the right winding device is wound up, and the left floor structure and the right floor structure are connected by the connecting pin.

[0019] The scaffolding dismantling method of the present invention can also be a method of providing a first mark and a second mark on the left and right hanging ropes, respectively. In this case, in the releasing process, the left and right hanging ropes are unwound until the first mark on the left hanging rope and the first mark on the right hanging rope reach predetermined positions, respectively, and in the restoring process, the left and right hanging ropes are unwound until the second mark on the left hanging rope and the second mark on the right hanging rope reach predetermined positions, respectively. Effect of the Invention

[0020] The mobile protective device and the construction scaffolding dismantling method of the present invention have the following effects. (1) When dismantling construction scaffolding, it is possible to prevent industrial accidents such as falls by workers and injuries to third parties caused by falling tools, etc., particularly in urban areas. (2) It is sufficient to install protective work on only a portion of the entire span of the bridge, and there is no need to replace the protective work every time a pier is passed. Therefore, demolition work can be carried out at lower cost than in the past. (3) It can be used as a scaffold for other work, such as touch-up work, painting the main body, and dismantling the formwork on the underside of the deck. [Brief description of the drawings]

[0021] [Figure 1] 1 is a cross-sectional view showing a schematic diagram of a mobile protection device of the present invention installed on a bridge deck. [Diagram 2] (a) is a cross-sectional view showing the bridge deck and main girder, and (b) is a cross-sectional view showing the construction scaffolding installed under the main girder. [Diagram 3] 1 is a cross-sectional view showing a mobile protection device of the present invention provided with handrails, a ladder, etc. [Figure 4] 1A is a plan view showing the lower floor structure, and FIG. 1B is a cross-sectional view showing the lower floor structure. [Diagram 5] Front view of the intermediate deck structure viewed in the bridge axis direction. [Figure 6] (a) is a front view of the connection structure between the left connecting beam and intermediate connecting beam, and the right connecting beam and intermediate connecting beam, viewed in the direction of the bridge axis, and (b) is a plan view of the connection structure between the left connecting beam and intermediate connecting beam, and the right connecting beam and intermediate connecting beam, viewed from above. [Figure 7] FIG. 4 is a side view showing an example of a moving mechanism. [Figure 8] FIG. 1 is a step diagram illustrating the procedure for the mobile protection device to pass through a pier. [Figure 9] A cross-sectional view showing a schematic diagram of a mobile protection device in which the left and right secondary support points slide. [Figure 10] FIG. 2 is a flow chart showing the flow of main steps in the scaffolding dismantling method of the present invention. [Figure 11] FIG. 1 is a side view showing a schematic diagram of a bridge whose main girders are supported by abutments and piers. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0022] An example of the mobile protective device and the construction scaffolding dismantling method of the present invention will be described with reference to the drawings. The construction scaffolding dismantling method of the present invention is a method for dismantling a construction scaffolding using the mobile protective device of the present invention. Therefore, the mobile protective device of the present invention will be described first, and then the construction scaffolding dismantling method of the present invention will be described. In addition, although "right" and "left" are sometimes used in the description, they mean "right" and "left" in the direction perpendicular to the bridge axis unless otherwise specified.

[0023] 1. Mobile protective equipment Fig. 1 is a cross-sectional view showing a mobile protection device 100 of the present invention installed on a bridge deck DC. A construction scaffold SF as shown in Fig. 2(b) used in this construction is installed under the main girder MG supporting the bridge deck DC as shown in Fig. 2(a), and the mobile protection device 100 can be used when dismantling the construction scaffold SF. Fig. 1 and Fig. 2 are cross-sectional views cut along a vertical plane perpendicular to the bridge axis.

[0024] As shown in Fig. 1, the mobile protection device 100 of the present invention is configured to include an upper bogie equipment 110 placed on the bridge deck DC, a lower floor structure 120 arranged below the bridge deck DC, and a main suspension member 130 that suspends the lower floor structure 120, and may further include a left weight 150L, ​​a right weight 150R, and an auxiliary suspension member 160. The upper bogie equipment 110 is configured to include a support beam 111 arranged along the direction perpendicular to the bridge axis, a moving mechanism 112, a bogie beam 113, a left winding device 140L, and a right winding device 140R. The left winding device 140L and the right winding device 140R are lifting devices such as winches and hoists, and can respectively unwind and wind up the left suspension rope 141L and the right suspension rope 141R. The left suspension rope 141L is wound around the left main pulley 142L, hangs down, and is connected to the left secondary support point 123L provided on the lower floor structure 120 (left floor structure 121L). Similarly, the right suspension rope 141R is wound around the right main pulley 142R, hangs down, and is connected to the right secondary support point 123R provided on the lower floor structure 120 (right floor structure 121R).

[0025] The lower floor structure 120 is configured to include a left floor structure 121L and a right floor structure 121R. The left floor structure 121L is provided with a left support point 122L connected to the lower end of the main hanging member 130 (left main hanging member 130L) and the above-mentioned left auxiliary support point 123L, while the right floor structure 121R is also provided with a right support point 122R connected to the lower end of the main hanging member 130 (right main hanging member 130R) and the above-mentioned right auxiliary support point 123RL. In addition, the right end of the left floor structure 121L (i.e., the end toward the center of the bridge cross section) and the left end of the right floor structure 121R (i.e., the end toward the center of the bridge cross section) are connected by a connecting pin; that is, when the connecting pin is installed, the left floor structure 121L and the right floor structure 121R are connected in an approximately horizontal (including horizontal) state as shown in Figure 1; on the other hand, when the connecting pin is removed, the connection is released and the left floor structure 121L and the right floor structure 121R are separated.

[0026] The main suspension member 130 is configured to include a left main suspension member 130L and a right main suspension member 130R. The left main suspension member 130L is disposed in a substantially vertical (including vertical) posture on the left side of the bridge deck DC and in a position (left outer side) outside the bridge deck DC as shown in Fig. 1, and its upper end is fixed to a part of the left outer side (a position on the left side of the bridge deck DC and outside the bridge deck DC) of the support beam material 111, and its lower end is connected to the left support point 122L of the above-mentioned left floor structure 121L. Similarly, right main hanging member 130R is disposed in a substantially vertical (including vertical) position on the right side of bridge deck DC and away from bridge deck DC (right outer side), with its upper end fixed to a part of the right outer side of support beam 111 (position on the right side of bridge deck DC and away from bridge deck DC), and its lower end connected to right support point 122R of right floor structure 121R described above. However, left main hanging member 130L and left support point 122L (i.e. left floor structure 121L), and right main hanging member 130R and right support point 122R (i.e. right floor structure 121R) are each hinged. In other words, the main hanging member 130 (left main hanging member 130L, right main hanging member 130R) supports the vertical load of the lower floor structure 120 (left floor structure 121L, right floor structure 121R) (restrains vertical movement), but is free to rotate.

[0027] The left weight 150L and the right weight 150R are so-called counterweights for reducing the winding and unwinding capacities imposed on the left winding device 140L and the right winding device 140R. The left weight 150L is preferably installed on the left floor structure 121L at a position to the left of the left support point 122L, and the right weight 150R is preferably installed on the right floor structure 121R at a position to the right of the right support point 122R.

[0028] The auxiliary hanging member 160 is a lifting device such as a chain block, a hoist, or a winch, and can be extended or retracted by unwinding or winding up a chain or a wire rope. By connecting the main girder MG and the lower floor structure 120 (left floor structure 121L, right floor structure 121R) with this auxiliary hanging member 160, the lower floor structure 120 is prevented from falling in the unlikely event of falling (a fail-safe is realized, so to speak), and the height of the lower floor structure 120 can be adjusted by the extension and contraction of the auxiliary hanging member 160. The auxiliary hanging member 160 can also be configured to include the left auxiliary hanging member 160L and the right auxiliary hanging member 160. In this case, it is preferable to connect the main girder MG (the main girder MG on the left side in FIG. 1) and the left floor structure 121L with the left auxiliary hanging member 160L, and to connect the main girder MG (the main girder MG on the right side in FIG. 1) and the right floor structure 121RL with the right auxiliary hanging member 160R.

[0029] Fig. 3 is a cross-sectional view showing a mobile protection device 100 of the present invention equipped with handrails and ladders, and is a cross-sectional view cut along a vertical plane perpendicular to the bridge axis, similar to Fig. 1. In Fig. 1, handrails and ladders are omitted in order to show the mobile protection device 100 in a schematic manner, but in reality, handrails and ladders are provided at key points as shown in Fig. 3 to ensure work safety, and if a construction scaffolding SF for ground covering is installed, an intermediate scaffolding is also provided.

[0030] Below, each of the main elements constituting the mobile protection device 100 of the present invention will be described in detail.

[0031] (Lower floor structure) FIG. 4 shows the lower floor structure 120, where (a) is a plan view from above, and (b) is a cross-sectional view cut by a vertical plane perpendicular to the bridge axis. As described above, the lower floor structure 120 is composed of a left floor structure 121L and a right floor structure 121R. Also, as shown in FIG. 4(a), the left floor structure 121L and the right floor structure 121R are each floor structures. The dimension of this floor in the direction perpendicular to the bridge axis must naturally be larger than the dimension of the construction scaffold SF in the direction perpendicular to the bridge axis, and it is preferable to set the dimension so that it protrudes further outward on both sides than the construction scaffold SF. On the other hand, the dimension of the floor in the bridge axis direction must be larger than the extension (dimension perpendicular to the bridge axis) of the construction scaffold SF per partial dismantling, and for example, it is preferable to set the dimension so that it protrudes slightly on both sides of the starting and ending points more than the length of the "oyago" used in the construction scaffold SF (for example, if the oyago length is 5.5 m, it is 6.0 m, etc.).

[0032] The lower floor structure 120 (left floor structure 121L, right floor structure 121R) is formed by floor beams and floor materials laid on them. Various conventional board materials such as wooden scaffolding boards can be used as this floor material, and CUSA (manufactured by Yokogawa Bridge Co., Ltd.), which is a panel structure using lightweight aluminum material, is particularly suitable as the floor material for the lower floor structure 120. Of course, the floor material is laid over the entire floor surface with as few gaps as possible to prevent workers or tools from falling. This also allows the mobile protection device 100 of the present invention to be used as a scaffold for other work such as touch-up work, main body painting work, and dismantling the deck underside formwork.

[0033] The floor beams are beam materials using H-shaped steel or square steel pipes, and it is preferable to arrange multiple floor beams at a predetermined interval in the bridge axis direction to support the entire floor material, and also arrange multiple floor beams at a predetermined interval in the direction perpendicular to the bridge axis. As described above, the left floor structure 121L and the right floor structure 121R are separably connected by a connecting pin. Therefore, it is preferable to separably connect a part (hereinafter referred to as "left connecting beam 124L") of the floor beams of the left floor structure 121L arranged in the direction perpendicular to the bridge axis (hereinafter referred to as "main floor beams") to a part (hereinafter referred to as "right connecting beam 124R") of the main floor beams of the right floor structure 121R by a connecting pin. For example, the main floor beams on the starting and ending sides (both ends in the bridge axis direction) can be separably connected as left connecting beam 124L and right connecting beam 124R, respectively, or the main floor beams on the starting side (or ending side) can be separably connected as left connecting beam 124L and right connecting beam 124R, respectively. Note that it is preferable to use a structure in which the other main floor beams that are not the left connecting beam 124L or right connecting beam 124R are not connected on the left and right sides.

[0034] The left connecting beam 124L and the right connecting beam 124R can be configured as a single horizontal beam or can be arranged in two levels, one above the other, in which case it is preferable to use a truss structure including a diagonal member. More specifically, the truss structure of the upper left connecting beam 124L (hereinafter referred to as the "upper left connecting beam 124LA"), the lower left connecting beam 124L (hereinafter referred to as the "lower left connecting beam 124LB"), and the diagonal member arranged between the upper left connecting beam 124LA and the lower left connecting beam 124LB is the left floor structure 121L, and similarly, the truss structure of the upper right connecting beam 124R (hereinafter referred to as the "upper right connecting beam 124RA"), the lower right connecting beam 124R (hereinafter referred to as the "lower right connecting beam 124RB"), and the diagonal member arranged between the upper right connecting beam 124RA and the lower right connecting beam 124RB is the right floor structure 121R.

[0035] The left floor structure 121L and the right floor structure 121R can be directly connected to each other, or can be connected to each other via an intermediate floor structure 121C as shown in FIG. 4. FIG. 5 is a front view of the intermediate floor structure 121C seen in the bridge axis direction. The intermediate floor structure 121C shown in this figure is used when connecting the left floor structure 121L composed of two upper and lower left connecting beams 124L (upper left connecting beam 124LA and lower left connecting beam 124LB) to the right floor structure 121R composed of two upper and lower right connecting beams 124R (upper right connecting beam 124RA and lower right connecting beam 124RB). Therefore, the intermediate floor structure 121C in this case is composed of two upper and lower intermediate connecting beams 124C, that is, the upper intermediate connecting beam 124CA and the lower intermediate connecting beam 124CB.

[0036] When the intermediate floor structure 121C is arranged between the left floor structure 121L and the right floor structure 121R, the right end of the left floor structure 121L (i.e., the end on the center side of the bridge cross section) and the left end of the intermediate floor structure 121C are separably connected by a connecting pin, and the left end of the right floor structure 121R (i.e., the end on the center side of the bridge cross section) and the right end of the intermediate floor structure 121C are separably connected by a connecting pin. More specifically, the right end of the left connecting beam 124L and the left end of the intermediate connecting beam 124C are connected by a connecting pin, and the left end of the right connecting beam 124R and the right end of the intermediate connecting beam 124C are connected by a connecting pin. Furthermore, when the connecting beams are arranged in two rows, one above the other, as shown in Figure 5, the right end of the upper right connecting beam 124RA and the left end of the upper intermediate connecting beam 124CA, the right end of the lower right connecting beam 124RB and the left end of the lower intermediate connecting beam 124CB, the left end of the upper right connecting beam 124RA and the right end of the upper intermediate connecting beam 124CA, and the left end of the lower right connecting beam 124RB and the right end of the lower intermediate connecting beam 124CB are each connected by connecting pins.

[0037] When connecting the left connecting beam 124L and the right connecting beam 124R, or the left connecting beam 124L (right connecting beam 124R) and the intermediate connecting beam 124C with connecting pins, a structure as shown in Fig. 6 can be used. Fig. 6 shows the connection structure between the left connecting beam 124L and the intermediate connecting beam 124C, and between the right connecting beam 124R and the intermediate connecting beam 124C, where (a) is a front view seen in the bridge axis direction, and (b) is a plan view seen from above. In this figure, a through hole is provided at the connecting end of each connecting beam, and the connecting pin is inserted after aligning the position of this through hole. For example, by aligning the position of the through hole provided at the right end of the upper left connecting beam 124LA with the insertion hole provided at the left end of the upper intermediate connecting beam 124CA and then inserting the connecting pin, or by aligning the position of the through hole provided at the left end of the lower right connecting beam 124RB with the insertion hole provided at the right end of the lower intermediate connecting beam 124CB and then counting the connecting pins, the left connecting beam 124L and the intermediate connecting beam 124C (i.e., the left floor structure 121L and the intermediate floor structure 121C) can be detachably connected, and the right connecting beam 124R and the intermediate connecting beam 124C (i.e., the right floor structure 121R and the intermediate floor structure 121C) can be detachably connected. In this case, the connecting pin may be machined to have a tapered shape (a tapered shape with a reduced diameter at one end) so that it can be easily inserted into the insertion hole.

[0038] When the intermediate floor structure 121C shown in FIG. 5 is used, the left floor structure 121L, the intermediate floor structure 121C, and the right floor structure 121R can be connected by inserting the connecting pins into the four insertion holes, and the left floor structure 121L, the intermediate floor structure 121C, and the right floor structure 121R can be separated (disconnected) by removing the connecting pins from the four insertion holes. Incidentally, as shown in this figure, a diagonal member can be installed in the intermediate floor structure 121C for reinforcement. The left floor structure 121L and the floor structure 121R are firmly connected by fixing both ends of the diagonal member to the splice plate with bolts (e.g., high-strength bolts). However, in this case, the left floor structure 121L, the intermediate floor structure 121C, and the right floor structure 121R cannot be separated from each other by simply removing the connecting pins, and the bolts at both ends of the diagonal member must also be removed, so the arrangement of the diagonal member should be appropriately selected according to the site. Alternatively, to facilitate removal of the diagonal members, jacks (e.g., hydraulic jacks), steel bars, turnbuckles, etc. may be used as the diagonal members.

[0039] (Upper cart equipment) As described above, the upper bogie equipment 110 is configured to include the support beam 111, the moving mechanism 112, the bogie beam 113, the left winding device 140L, and the right winding device 140R. The support beam 111 can be made of beam materials such as H-shaped steel or square steel pipes, and is arranged along the bridge axis direction. However, the support beam 111 is arranged so that the left end of the support beam 111 is the left outer side of the bridge deck DC (a position on the left side of the bridge deck DC and outside the bridge deck DC) and the right end of the support beam 111 is the right outer side of the bridge deck DC (a position on the right side of the bridge deck DC and outside the bridge deck DC). A bogie beam 113 made of beams such as H-shaped steel or square steel pipes arranged in a crisscross pattern is disposed below the support beam 111, and a moving mechanism 112 is attached to the lower part of this bogie beam 113, which is placed on the bridge deck DC. In other words, the support beam 111 is attached via the bogie beam 113 to the moving mechanism 112 placed on the bridge deck DC.

[0040] A left winding device 140L and a right winding device 140R are installed on the support beam 111. The left suspension rope 141L sent out from the left winding device 140L is wound around the left main pulley 142L and hangs down, and is connected to the left auxiliary support point 123L provided on the left floor structure 121L, while the right suspension rope 141R sent out from the right winding device 140R is wound around the right main pulley 142R and hangs down, and is connected to the right auxiliary support point 123R provided on the right floor structure 121R. However, the left suspension rope 141L hangs down between the left end of the bridge deck DC and the left main suspension member 130L, and the right suspension rope 141R hangs down between the right end of the bridge deck DC and the right main suspension member 130R. As a result, when the left winding device 140L unwinds the left suspension rope 141L, the left secondary support point 123L descends, and conversely, when the left winding device 140L winds up the left suspension rope 141L, the left secondary support point 123L rises, and similarly, when the right winding device 140R unwinds the right suspension rope 141R, the right secondary support point 123R descends, and conversely, when the right winding device 140R winds up the right suspension rope 141R, the right secondary support point 123R rises. Note that the left suspension rope 141L and the right suspension rope 141R can also be structured so that they are wound around the left main pulley 142L and the right main pulley 142R, and then wound around a movable pulley arranged on the lower end side, and further wound around a fixed pulley fixed to the support beam 111 at the top, and the lower end of the rope is connected to the left secondary support point 123L and the right secondary support point 123R.

[0041] The moving mechanism 112 is capable of moving in the bridge axis direction on the bridge deck DC. As described above, the support beam 111 is attached to the moving mechanism 112 via the bogie beam 113, and as will be described later, the lower floor structure 120 is attached to the support beam 111 via the main suspension member 130. Therefore, when the moving mechanism 112 moves in the bridge axis direction, the upper bogie equipment 110, the lower floor structure 120, and the main suspension member 130 (i.e., the mobile protection device 100) move together in the bridge axis direction.

[0042] FIG. 7 is a side view showing an example of the moving mechanism 112. In this figure, the moving mechanism 112 is a wheel WH attached to the lower part of the bogie beam material 113, and is a mechanism that moves in the bridge axis direction by using a rail RL laid along the bridge axis direction. Specifically, the wheels WH are placed on the rail RL, and the mobile protection device 100 is moved in the bridge axis direction by pulling a wire rope or the like connected to the upper bogie equipment 110 with a pulling means. The rail RL can be configured by installing a flat bar on a beam material such as a square steel pipe or H-shaped steel, and a chill hole, a chain block, a hoist, a winch, or the like can be used as the pulling means. It is advisable to provide a stopper at an appropriate position of the rail RL to prevent the mobile protection device 100 from falling off. The moving mechanism 112 is not limited to the configuration shown in FIG. 7, and can use any conventional technology, such as a self-propelled type consisting of a combination of power and tires (or crawlers).

[0043] (Main hanging material) As described above, the main hanging member 130 is composed of the left main hanging member 130L and the right main hanging member 130R. The left main hanging member 130L is disposed on the left outer side of the bridge deck DC, with its upper end fixed to a part of the left outer side of the support beam 111, and its lower end hinged to the left support point 122L of the left floor structure 121L. Similarly, the right main hanging member 130R is disposed on the right outer side of the bridge deck DC, with its upper end fixed to a part of the right outer side of the support beam 111, and its lower end hinged to the right support point 122R of the right floor structure 121R.

[0044] The lower end of the left main suspension member 130L and the left support point 122L are hinged to rotate freely, and the left auxiliary support point 123L (the lower end of the left suspension rope 141L) is located to the right of the left support point 122L (i.e., toward the center of the bridge cross section) as shown in Figure 1, so that when the left winding device 140L unwinds the left suspension rope 141L, the left side of the left support point 122L of the left floor structure 121L rises and the right side of it (i.e., toward the center of the bridge cross section) drops, but the left support point 122L does not rise or fall and maintains its height. In other words, the left floor structure 121L is a balance structure with the left support point 122L as a fulcrum, so that if one side of the left support point 122L rises, the other side drops, and if one side of the left support point 122L drops, the other side rises. Similarly, the lower end of the right main suspension member 130R and the right support point 122R are connected with a hinge that allows free rotation, and the right secondary support point 123R (the lower end of the right suspension rope 141R) is positioned to the left of the right support point 122R (i.e., toward the center of the bridge cross section).As a result, when the right winding device 140R reels out the right suspension rope 141R, the part of the right floor structure 121R to the right of the left support point 122L rises and the left side of that (i.e., toward the center of the bridge cross section) descends, but the right support point 122R maintains its height without rising or falling.

[0045] By the way, in order for the left end of the left floor structure 121L to descend when the left winding device 140L unwinds the left hanging rope 141L, the weight of the left floor structure 121L on the right side of the left support point 122L must be greater than that on the left side, and in order for the left end of the right floor structure 121R to descend when the right winding device 140R unwinds the right hanging rope 141R, the weight of the right floor structure 121R on the left side of the right support point 122R must be greater than that on the right side. At this time, if the right side of the left floor structure 121L or the left side of the right floor structure 121R becomes considerably heavy, the burden on the left winding device 140L and the right winding device 140R becomes large, and a winch or the like with a considerable capacity must be prepared. Therefore, in order to reduce the winding and unwinding capacities required for the left winding device 140L and the right winding device 140R, it is advisable to install the left weight 150L on the left floor structure 121L at a position to the left of the left support point 122L, and install the right weight 150R on the right floor structure 121R at a position to the right of the right support point 122R. Various materials can be used for the left weight 150L and the right weight 150R as long as they have an appropriate weight, and beam materials such as H-shaped steel or square steel pipes that can be arranged in the bridge axis direction are particularly suitable.

[0046] (Example of use) As explained so far, the mobile protection device 100 of the present invention can move in the bridge axial direction by the moving mechanism 112, but when passing through a pier, the lower floor structure 120 and the like become obstacles. However, the mobile protection device 100 of the present invention can move smoothly while avoiding the pier PR as shown in Figure 8. Below, the procedure for the mobile protection device 100 to pass through the pier PR will be explained with reference to Figure 8.

[0047] First, the intermediate floor structure 121C is removed from the lower floor structure 120 by removing the connecting pin, and the left floor structure 121L and the right floor structure 121R are separated. Figure 8(a) shows the left floor structure 121L and the right floor structure 121R separated state. At this time, in order to prevent the lower floor structure 120 from falling, it is recommended that the main girder MG and the left floor structure 121L are connected by the left auxiliary hanging member 160L, and the main girder MG and the right floor structure 121RL are connected by the right auxiliary hanging member 160R.

[0048] When the left floor structure 121L and the right floor structure 121R are separated, a state in which a separation occurs between the left floor structure 121L and the right floor structure 121R as shown in FIG. 8(b) (hereinafter, for convenience, this will be referred to as an "open state"). Specifically, the left winding device 140L unwinds the left suspension rope 141L, and the right winding device 140R unwinds the right suspension rope 141R. As a result, the left side of the left floor structure 121L rises and the right side falls so as to rotate around the left support point 122L (rotating clockwise in FIG. 8), and the right side of the right floor structure 121R rises and the left side falls so as to rotate around the right support point 122R (rotating counterclockwise in FIG. 8). As a result, a considerable separation occurs between the right end of the left floor structure 121L and the left end of the right floor structure 121R, that is, an open state in which the pier PR can pass through is achieved. At this time, in order to prevent the lower floor structure 120 from accidentally falling, the main girder MG can be connected to the left floor structure 121L and the right floor structure 121RL by the left auxiliary hanging member 160L and the right auxiliary hanging member 160R, and this connection can also be released at this point. However, the left auxiliary hanging member 160L and the right auxiliary hanging member 160R must be disconnected from the left floor structure 121L and the right floor structure 121RL at least immediately before moving toward the pier PR.

[0049] When the mobile protection device 100 is opened, it moves while avoiding the pier PR while maintaining the open state, as shown in Fig. 8(b). When the mobile protection device 100 moves past the pier PR, the left floor structure 121L and the right floor structure 121R are connected in the reverse procedure to that for opening the mobile protection device 100. Specifically, the left winding device 140L winds up the left suspension rope 141L, and the right winding device 140R winds up the right suspension rope 141R. As a result, the left side of the left floor structure 121L descends and the right side rises as it rotates around the left support point 122L (rotating counterclockwise in Figure 8), and the right side of the right floor structure 121R descends and the left side rises as it rotates around the right support point 122R (rotating clockwise in Figure 8).As a result, the left floor structure 121L and the right floor structure 121R each assume an approximately horizontal (including horizontal) position, and the left floor structure 121L and the right floor structure 121R are connected by inserting a connecting pin.

[0050] Incidentally, the left floor structure 121L moves so as to rotate around the left support point 122L, and the right floor structure 121R moves so as to rotate around the right support point 122R. Therefore, as can be seen by comparing FIG. 8(a) and FIG. 8(b), the left suspension rope 141L and the right suspension rope 141R hang down at a slight incline from the vertical direction. In this case, it is possible that the left suspension rope 141L and the right suspension rope 141R may apply unexpected forces to intermediate pulleys such as the left main pulley 142L and the right main pulley 142R. To avoid such a situation, it is recommended to use a mechanism in which the left secondary support point 123L slides on the left connecting beam 124L in a direction perpendicular to the bridge axis, and the right secondary support point 123R slides on the right connecting beam 124R in a direction perpendicular to the bridge axis, as shown in FIG. 9. When the left floor structure 121L rotates around the left support point 122L, the left secondary support point 123L slides to the right, thereby maintaining the left suspension rope 141L in the vertical direction, and when the right floor structure 121R rotates around the left support point 122L, the right secondary support point 123R slides to the left, thereby maintaining the right suspension rope 141R in the vertical direction.

[0051] 2.How to dismantle construction scaffolding Next, the construction scaffolding dismantling method of the present invention will be described with reference to Fig. 10. The construction scaffolding dismantling method of the present invention is a method for dismantling a construction scaffolding using the mobile protective device 100 described so far. Therefore, we will avoid any explanation that overlaps with the contents explained about the mobile protective device 100, and will only explain the contents unique to the construction scaffolding dismantling method of the present invention. In other words, the contents not described here are the same as those explained in "1. Mobile protective device".

[0052] Fig. 10 is a flow diagram showing the flow of the main steps of the construction scaffolding dismantling method of the present invention. As shown in this figure, first, the mobile protection device 100 of the present invention is installed on the bridge deck DC at a predetermined position in the bridge axis direction (for example, on the starting point side) (Step 10 in Fig. 10). Then, the mobile protection device 100 is moved in the bridge axis direction, and if there is a pier PR in the planned moving section (Yes in Step 20 in Fig. 10), the process proceeds to the opening process (Step 20 in Fig. 10), while if there is no pier PR (No in Step 20 in Fig. 10), the process proceeds directly to the relocation process (Step 40 in Fig. 10) and the partial dismantling process (Step 60 in Fig. 10) described later.

[0053] In the opening step (Step 20 in FIG. 10), the mobile protection device 100 is opened. Specifically, as described above, the left winding device 140L unwinds the left suspension rope 141L and the right winding device 140R unwinds the right suspension rope 141R, creating a state in which a separation occurs between the right end of the left floor structure 121L and the left end of the right floor structure 121R. At this time, it is advisable to use the "first mark" provided on the left suspension rope 141L and the right suspension rope 141R, and then unwind the left suspension rope 141L and unwind the right suspension rope 141R. This first mark indicates the position of the suspension ropes (left suspension rope 141L and right suspension rope 141R) when the mobile protection device 100 is appropriately opened by performing a test construction in advance, and indicates that the mobile protection device 100 is in an open state when the first mark is located 1 m above the bridge deck DC, for example. Therefore, even in the opening process (Step 20 in Fig. 10), if the unwinding operation of the left suspension rope 141L and the right suspension rope 141R is stopped when the first mark is located, for example, 1 m above the bridge deck DC, the mobile protection device 100 will be in an appropriate open state. This first mark can be attached to the left suspension rope 141L and the right suspension rope 141R by painting them in a particularly conspicuous color such as red, or by wrapping red tape around them.

[0054] When the mobile protection device 100 is opened, the mobile protection device 100 is moved forward in the bridge axis direction by the moving mechanism 112 while in the open state (Step 40 in FIG. 10). Then, when the mobile protection device 100 advances until it passes the pier PR, the left floor structure 121L and the right floor structure 121R are connected (Step 50 in FIG. 10). Specifically, as described above, the left winding device 140L winds up the left suspension rope 141L and the right winding device 140R raises the right suspension rope 141R, and the left floor structure 121L and the right floor structure 121R are placed in a substantially horizontal position, and then the connecting pin is inserted to connect the left floor structure 121L and the right floor structure 121R. At this time, it is advisable to wind up the left hanging rope 141L and the right hanging rope 141R after using the "second mark" provided on the left hanging rope 141L and the right hanging rope 141R. This second mark indicates the position of the hanging ropes (left hanging rope 141L and right hanging rope 141R) when the left floor structure 121L and the right floor structure 121R are in a substantially horizontal position (connectable state) by performing a test construction in advance, and indicates that they are in a connectable state when the second mark is located 1 m above the bridge deck DC, for example. Therefore, even in the restoration process (Step 50 in FIG. 10), if the winding operation of the left hanging rope 141L and the right hanging rope 141R is stopped when the second mark is located 1 m above the bridge deck DC, the floor structure 121L and the right floor structure 121R will be in a connectable state. This second mark, like the first mark, can be attached to left suspension rope 141L and right suspension rope 141R by painting them in a particularly conspicuous color such as red or by wrapping them with red tape.

[0055] When the mobile protection device 100 advances to a predetermined position and further couples the floor structure 121L with the right floor structure 121R, the construction scaffolding SF within the range in which the mobile protection device 100 was positioned after the movement is dismantled (Step 60 in Fig. 10). If there is still construction scaffolding SF to be dismantled (No in Step 70 in Fig. 10), Steps 10 to 60 are repeated, whereas when all the construction scaffolding SF has been dismantled, the mobile protection device 100 is dismantled and removed from the bridge deck DC (Step 80 in Fig. 10). [Industrial Applicability]

[0056] The mobile protective device and construction scaffolding dismantling method of the present invention can be used for bridges of all kinds, such as road bridges and railway bridges, and can be used for bridges that cross various types of bridges, such as bridges that cross rivers, overpasses, and overpasses. According to the present invention, it is possible to prevent accidents involving workers falling or tools dropping, and third party damage, and considering that the present invention provides safer work, it can be said that the invention is not only applicable to industry, but also has the potential to make a great contribution to society. [Explanation of symbols]

[0057] 100 Mobile protection device of the present invention 110 (Mobile protective equipment) upper trolley equipment 111 (Upper carriage equipment) support beam 112 (Upper carriage equipment) moving mechanism 113 (Upper bogie equipment) Bogie beam material 120 (Mobile protective device) lower floor structure 121L (lower floor structure) left floor structure 122L (Left floor structure) Left support point 123L (Left floor structure) Left secondary support point 124L (Left floor structure) Left connecting beam 124LA (Left Tie Beam) Upper Left Tie Beam 124LB (Left connecting beam) Lower left connecting beam 121R (lower floor structure) Right floor structure 122R (Right floor structure) Right support point 123R (Right floor structure) Right secondary support point 124R (Right floor structure) Right connecting beam 124RA (Right Tie Beam) Upper Right Tie Beam 124RB (Right connecting beam) Lower right connecting beam 121C (of lower floor structure) Intermediate floor structure 124C (Intermediate floor structure) Intermediate connecting beam 124CA (Intermediate Tie Beam) Upper Intermediate Tie Beam 124CB (Intermediate Connecting Beam) Lower Intermediate Connecting Beam 130 (Mobile protection device) main suspension member 130L (Main Hanging Member) Left Main Hanging Member 130R (Main Hanging Member) Right Main Hanging Member 140L (Mobile protective equipment) Left winding device 141L Left lifting rope (for left winding device) 142L Left main pulley 140 Right winding device (for mobile protective equipment) R 141R Right hoist rope (for left winding device) 142R Right main pulley 150L (Mobile Protective Equipment) Left Counterweight 150R (Mobile Protective Equipment) Right Pound 160 (Mobile protective equipment) auxiliary suspension 160L (Auxiliary Hanger) Left Auxiliary Hanger 160R (Auxiliary Hanger) Right Auxiliary Hanger DC bridge deck slab MG main girder PR Bridge pier RL rail SF Construction scaffolding WH Wheels

Claims

1. A protection device that is installed on the bridge deck and can move in the bridge axial direction, An upper carriage equipment placed on the floor slab; A lower floor structure arranged below the floor slab; A main hanging member that hangs the lower floor structure; Left main pulley, a right main pulley; The upper bogie equipment includes a support beam arranged along a direction perpendicular to the bridge axis, a left winding device and a right winding device installed on the support beam, and a moving mechanism that moves the support beam in the bridge axis direction, The lower floor structure includes a left floor structure and a right floor structure, and a right end of the left floor structure and a left end of the right floor structure are separably connected by a connecting pin, The support beam is a series of beams extending from the left outer side of the deck to the right outer side of the deck in a direction perpendicular to the bridge axis, The main suspension member includes a left main suspension member arranged on the left outer side of the deck in the direction perpendicular to the bridge axis, and a right main suspension member arranged on the right outer side of the deck in the direction perpendicular to the bridge axis, The upper end of the left main hanging member is fixed to the support beam protruding to the left outside of the deck in the direction perpendicular to the bridge axis, and the left support point provided on the left floor structure and the lower end of the left main hanging member are hinged together. The upper end of the right main hanging member is fixed to the support beam protruding to the right outside of the deck in the direction perpendicular to the bridge axis, and the right support point provided on the right floor structure and the lower end of the right main hanging member are hinged together. The left winding device and the right winding device are installed on the support beam material located on the deck, The left main pulley is installed on the support beam protruding to the left outside of the deck in the direction perpendicular to the bridge axis, The right main pulley is installed on the support beam protruding to the right outside of the deck in the direction perpendicular to the bridge axis, The left suspension rope sent out from the left winding device is wound around the left main pulley and hangs down between the left end of the deck in the direction perpendicular to the bridge axis and the left main suspension member, and the lower end of the left suspension rope is connected to the left floor structure to the right of the left support point, The right suspension rope sent out from the right winding device is wound around the right main pulley and hangs down between the right end of the deck in the direction perpendicular to the bridge axis and the right main suspension member, and the lower end of the right suspension rope is connected to the right floor structure to the left of the right support point, After the connecting pin is removed, when the left winding device winds out the left suspension rope, the left end of the left floor structure rises and the right end drops, and when the right winding device winds out the right suspension rope, the right end of the right floor structure rises and the left end drops, resulting in an open state in which a gap occurs between the right end of the left floor structure and the left end of the right floor structure, When the support beam material is moved in the bridge axial direction by the moving mechanism in the open state, the bridge pier can pass through the gap generated between the left floor structure and the right floor structure. A mobile protective device characterized in that

2. A left weight is placed on the left floor structure to the left of the left support point, and a right weight is placed on the right floor structure to the right of the right support point.

2. The mobile protection device according to claim 1.

3. A method for dismantling a construction scaffolding installed when constructing a bridge using the mobile protection device according to claim 1 or 2, An installation process of installing the mobile protection device on the floor slab such that the upper cart equipment is placed on the floor slab, the lower floor structure is disposed below the floor slab, and the main hanging member suspends the lower floor structure; a relocation process in which the movable protection device is moved together with the support beam in the bridge axis direction by the moving mechanism; A partial dismantling process of dismantling the construction scaffolding within the range in which the mobile protective device is arranged after the movement, When the construction scaffolding is dismantled in the partial dismantling process, the relocation process is performed again. A construction scaffolding dismantling method.

4. The method further includes an opening step of removing the connecting pin, unwinding the left suspension rope of the left winding device and unwinding the right suspension rope of the right winding device to open the mobile protection device, In the relocation process when passing through the bridge pier, the mobile protection device is moved in the bridge axis direction after being placed in the open state by the opening process. The scaffolding dismantling method according to claim 3.

5. Further provided is a restoration process in which, after passing through the pier in the relocation process, the left suspension rope of the left winding device is wound up, the right suspension rope of the right winding device is wound up, and the left floor structure and the right floor structure are connected by the connecting pin. The scaffolding dismantling method according to claim 4.

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