JP2021042632A - Cantilever device for bridge construction and method for erecting and demolishing bridge - Google Patents

Abstract

To address the problem of preventing materials from falling during bridge erection and demolition work.SOLUTION: A cantilever device 1 for bridge construction used for the erection work or the demolition work of a bridge 2, includes: a suspension device 10 installed on the upper part of the bridge 2; a work floor 30 installed below the bridge 2; a temporary scaffolding 40 installed on the work floor 30; a protective material 50 installed on the outer peripheral edge of the work floor 30 and suspended by the suspension device 10. The protective material 50 is separated from the temporary scaffolding 40, and the lower end part of the protective material 50 is connected to the work floor 30.SELECTED DRAWING: Figure 4

Description

The present invention relates to a cantilever device for bridge construction used for bridge erection work or dismantling work, and a bridge erection and demolition method.

When constructing or dismantling a bridge, a construction method is adopted in which a mobile work vehicle that moves on the bridge is provided and the work is performed on a work scaffold suspended from the mobile work vehicle (see, for example, Patent Document 1). ). When constructing with this method, materials such as building materials and tools may fall, so if there is a road under the bridge, the risk is avoided by restricting the road closure. ..

Japanese Patent Application No. 2017-20290

By the way, if it is not possible to restrict traffic on the road below the bridge, it is necessary to take measures to prevent the material from falling.
From such a viewpoint, it is an object of the present invention to provide a cantilever device for bridge construction and a method for erection and dismantling of a bridge, which can prevent materials from falling.

As a cantilever erection device for bridge construction, the present inventors have provided a protective material having a fall / scattering prevention function separated from the temporary scaffolding on the outside of the temporary scaffolding so as to cover the bridge portion to be erected and dismantled. By installing the bridge, it is possible to prevent the construction materials and tools from falling and scattering during the bridge construction, and to carry out the construction work in a work environment that reduces the effects of wind and rain. We have developed a cantilever device for use.
The first invention for solving such a problem is a cantilever device for bridge construction used for bridge erection work or demolition work. Such a cantilever device for bridge construction includes a suspension device installed on the upper part of the bridge, a work floor installed below the bridge, a temporary scaffolding installed on the work floor, and the work floor. It is characterized in that it is provided with a protective material which is installed on the outer peripheral edge portion of the above and is suspended by the suspension device.
According to the cantilever device for bridge construction according to the present invention, since the protective material is installed on the outer peripheral edge of the work floor, it is possible to prevent the material from falling. Further, if the protective material is made of a sheet material, it is more easily deformed than the plate material, and the wind pressure can be released by the deformation. In addition, the protective material blocks the wind and rain, which improves the working environment. In the event of a typhoon, the protective material can be prevented from being damaged by lowering and storing the protective material with a hanging device.

The bridge cantilever demolition device according to the present invention is characterized in that the protective material is separated from the temporary scaffold, and the lower end portion of the protective material is connected to the work floor. According to such a configuration, even if the material is dropped during the assembly or disassembly of the bridge, the fallen object does not fall to the outside of the protective material and can be received on the work floor.

The second invention for solving the above-mentioned problems is a method for constructing and dismantling a bridge using the cantilever device for bridge construction according to claim 1 or 2. Such a bridge erection and demolition method includes an installation step of the bridge construction cantilever device for installing the bridge construction cantilever device at the end of the bridge under construction or the end of the bridge during the dismantling, and the bridge erection. It is provided with an erection dismantling step of dismantling or dismantling the bridge. In the erection and demolition process, bridge construction is performed on the inner portion surrounded by the protective material. The installation step of the cantilever device for bridge construction and the erection and dismantling step are repeatedly performed along the extending direction of the bridge.
According to the bridge erection and demolition method according to the present invention, since the outside of the temporary scaffold for performing the bridge erection or demolition work is surrounded by the protective material, the protective material can prevent the material from falling below the work floor. Furthermore, the influence of wind and rain can be reduced, and work can be performed in a good working environment.

According to the cantilever device for bridge construction and the method of erection and dismantling of a bridge according to the present invention, an excellent effect of preventing material from falling is exhibited.

It is a perspective view which showed the cantilever device for bridge construction which concerns on embodiment of this invention. It is a side view which showed the cantilever device for bridge construction which concerns on embodiment of this invention. (A) is a front view showing a cantilever device for bridge construction according to an embodiment of the present invention, and (b) is a partially enlarged view. It is a perspective view which showed the state which the protective material of the cantilever device for bridge construction which concerns on embodiment of this invention is lifted. It is a perspective view which showed the state which the protective material of the cantilever device for bridge construction which concerns on embodiment of this invention is suspended. It is a side view for demonstrating the bridge erection dismantling method which concerns on embodiment of this invention.

The present invention is a cantilever device for bridge construction used for erection work or dismantling work of a bridge, and a method for erection and demolition of a bridge using the cantilever device for bridge construction. The configuration of the cantilever for bridge construction will be described below with reference to the attached drawings. The cantilever device for bridge construction is used for bridge erection work or demolition work. The cantilever device for bridge construction is provided at the tip of the bridge under construction or at the tip of the bridge during demolition, and the work floor or the like is hung in a state of protruding from the tip of the bridge. The bridge is sequentially erected or dismantled for each block of a predetermined length. In the present embodiment, a case where bridges are sequentially erected at predetermined lengths will be described as an example.

As shown in FIGS. 1 to 3, the bridge construction cantilever device 1 includes a hanging device 10, a work floor 30, a temporary scaffold 40, and a protective material 50.
The hanging device 10 suspends the work floor 30 and the protective material 50, and is installed above the tip of the bridge under construction. The suspending device 10 includes a traveling rail 11, a traveling carriage 12, a suspending member 13, and an elevating jig 14. The traveling rail 11 extends along the erection direction of the bridge 2 and is laid on the upper surface of the bridge 2. The traveling rail 11 is composed of, for example, two rows of H-shaped steel or I-shaped steel arranged in parallel, and is arranged on both sides of the bridge 2 in the width direction. The traveling rail 11 is fixed to the upper surface of the bridge 2 by a rail anchor (not shown) or the like.

The traveling carriage 12 travels on the traveling rail 11 along the erection direction of the bridge 2. The traveling carriage 12 includes a pair of frame portions 15 and 15, a connecting beam 16, and a traveling drive portion 17.
The frame portion 15 has a parallelogram shape in a side view, and includes a bottom portion 15a, an upper side portion 15b, and a pair of hypotenuse portions 15c and 15d. The frame portions 15 are provided on both sides of the bridge 2 in the width direction, and are arranged on the traveling rails 11. The bottom side portion 15a and the upper side portion 15b extend horizontally along the erection direction of the bridge 2. The bottom portion 15a is located on the traveling rail 11. The hypotenuse portion 15c on the front side (direction in which the bridge 2 is sequentially erected) side of the frame portion 15 rises diagonally forward and upward from the front end portion of the bottom side portion 15a and projects in front of the bridge 2. A pillar member 18 is provided between the intersection of the bottom side portion 15a and the front hypotenuse portion 15c and the intersection facing this intersection (the intersection of the upper side portion 15b and the rear hypotenuse portion 15d).

The connecting beam 16 is a member that connects the frame portions 15 and 15, and is composed of, for example, two rows of H-shaped steel or I-shaped steel arranged in parallel. The connecting beam 16 extends in the width direction of the bridge 2 and is hung on the upper side portions 15b and 15b of the adjacent frame portions 15 and 15. The connecting beams 16 are provided at two locations, a front end portion and a rear end portion, of the upper side portion 15b. Both ends of the connecting beam 16 extend outward in the width direction from the frame portion 15.

The traveling drive unit 17 is a portion for moving the frame unit 15 on the traveling rail 11. The traveling drive unit 17 is provided below the frame unit 15, and includes, for example, a wheel that moves on the traveling rail 11, a drive motor that rotates the wheel, and a fixing means that fixes the frame unit 15 to the traveling rail 11. It has. Wheels are provided at both front and rear ends of the bottom portion 15a of the frame portion 15, respectively. The drive motor and fixing means are provided at the front end of the bottom 15a. The traveling drive unit 17 operates only when the traveling carriage 12 is moving, and fixes the frame portion 15 to the traveling rail 11 by fixing means during the erection work or the dismantling work of the bridge 2.

The suspending member 13 is a member that suspends the work floor 30 from the traveling carriage 12. The suspension member 13 is composed of, for example, a plurality of steel rods, and the upper end portion of the suspension member 13 is sandwiched between the H-shaped steels of the connecting beam 16 so that the height can be adjusted. A work floor 30 is fixed to the lower end of the hanging member 13. Suspension members 13 are provided at both ends of the front and rear connecting beams 16 to support the work floor 30.

The lifting jig 14 raises and lowers the protective material 50, and is composed of, for example, an electric hoist. The lifting jig 14 includes a front elevator 22a and a side elevator 22b. The front elevator 22a is an electric hoist that supports the front surface portion of the protective material 50. The front elevator 22a is suspended from the front end of the front cantilever 23a provided on the connecting beam 16 located in front of the elevator 22a. The front cantilever 23a is made of, for example, H-shaped steel. The front cantilever 23a is attached to the upper part of the connecting beam 16 and projects toward the front of the connecting beam 16. For example, three front elevators 22a and front cantilever beams 23b are arranged at predetermined intervals in the width direction of the bridge 2.
The side elevator 22b is an electric hoist that supports a side surface portion of the protective material 50. The side elevator 22b is suspended from the tip ends of the side cantilever 23b provided at both ends of the connecting beam 16. The side cantilever 23b is made of, for example, H-shaped steel. The lateral cantilever beams 23b are attached to the upper portions of both ends of the front and rear connecting beams 16, respectively, and project outward in the width direction of the bridge 2. Two side elevators 22b and two side cantilever beams 23b are arranged at both ends of each connecting beam 16.

The work floor 30 is a floor portion that receives a work space for performing erection work or dismantling work, and the floor material is laid on a frame in which steel materials are combined in a grid pattern. The gap between the floor materials is large enough to prevent building materials, tools, etc. from falling. The width dimension of the work floor 30 is larger than the width dimension of the bridge 2. The work floor 30 is arranged so as to project forward from below the tip of the bridge 2 in the erection direction. The work floor 30 is installed below the bridge 2 and is suspended from the traveling carriage 12 of the suspension device 10 via the suspension member 13. The suspending material 13 is connected to the vicinity of the four corners of the work floor 30.

The temporary scaffold 40 is a scaffold for performing erection work of a construction block added to the tip of a bridge to be erected or dismantling work of a construction block removed at the tip of a bridge to be dismantled. The temporary scaffold 40 is arranged so as to cover the front end portion of the bridge 2. The temporary scaffolding 40 is supported by a plurality of columns 41, 41 ... Standing on the work floor 30, and is installed in a plurality of stages (for example, four stages) above the work floor 30.

As shown in FIG. 4, the protective material 50 is separated from the temporary scaffold 40 and is arranged outside the temporary scaffold 40. The upper end of the protective material 50 is suspended from the lifting jig 14, and the lower end of the protective material 50 is connected to the outer peripheral edge of the work floor 30. The protective material 50 surrounds the front surface and both side surfaces of the work space. The protective material 50 includes a support frame 51 and a mesh sheet 52.
The support frame 51 is made of a steel frame having a U-shape in a plan view. A steel frame is made by welding a square pipe into a U shape, for example. The support frame 51 is arranged at the upper end of the protective material 50 and is suspended from the elevating jig 14. As shown in FIG. 3B, the support frame 51 is provided with a locking portion 53, and is supported by locking the hook 14b at the tip of the wire 14a of the electric hoist to the locking portion 53. The frame 51 is suspended.

As the mesh sheet 52, for example, a mesh sheet having a size of 1 mm is used, and building materials, tools, and the like cannot pass through it. The mesh sheet 52 is flexible and foldable. The upper end portion of the mesh sheet 52 is connected to the support frame 51 over the entire length. The lower end of the mesh sheet 52 is connected to the work floor 30 over the entire length. The mesh sheet 52 is located outside the temporary scaffold 40 and the suspension member 13, and surrounds the front surface and both side surfaces of the work space when the support frame 51 is raised. When the support frame 51 is lowered, the mesh sheet 52 is folded on the work floor 30 and pressed by the support frame 51 from above (see FIG. 5).

Next, while explaining the bridge erection and dismantling method using the bridge construction cantilever device 1 having the above configuration, the effects of the bridge construction cantilever device 1 and the bridge erection and dismantling method will be described. In the present embodiment, a case where bridges are sequentially erected at predetermined lengths will be described as an example. Such a bridge erection and demolition method includes an installation process of a cantilever device for bridge construction and an erection and demolition process.

The installation process of the cantilever device for bridge construction is a step of installing the cantilever device 1 for bridge construction at the end of the bridge under construction (in the case of dismantling the bridge 2, the end of the bridge during dismantling). .. In the process of installing the cantilever device for bridge construction, first, the traveling rail 11 is laid on the bridge 2. After that, the traveling carriage 12 is installed on the traveling rail 11 and the work floor 30 is suspended. Then, the protective material 50 is hung from the lifting jig 14 of the hanging device 10, and the lower end portion of the mesh sheet 52 of the protective material 50 is connected to the work floor 30.
Then, as shown in FIG. 4, the support frame 51 is raised to a predetermined height above the upper surface of the bridge 2 by the lifting jig 14, and the mesh sheet 52 is stretched between the work floor 30 and the support frame 51. To. Here, the front surface and both side surfaces of the work space are surrounded by the protective material 50, and the rear surface of the work space is surrounded by the existing bridge 2. As a result, the work space for performing the work and the newly erected construction block are all surrounded by the protective material 50 and the existing bridge 2 from the lower end to the upper end. Then, in this state, the temporary scaffold 40 is installed on the work floor 30.
In the installation process of the cantilever device for bridge construction after the second round, the traveling rail 11 is laid on the newly erected construction block, and the work floor 30 and the protective material 50 are suspended. The existing traveling carriage 12 is moved forward.

The erection dismantling step is a step of performing erection work on the work floor 30 and on the inner portion surrounded by the protective material 50. The erection dismantling step is performed on the work floor 30 or the temporary scaffold 40 in the inner portion surrounded by the protective material 50. As a result, even if the worker drops materials such as building materials and tools, they will fall on the work floor 30 or the temporary scaffolding 40. At this time, even if the material flies from the side surface of the work space to the outside, it is stopped by the protective material 50 and can be received by the inner work floor 30. Therefore, it is possible to prevent building materials, tools, and the like from falling downward from the construction site on the upper part of the bridge. As a result, even if there is a road or the like under the bridge, it is not necessary to restrict the road closure. In addition, even if it is not possible to restrict traffic on the road below the bridge, construction can be carried out above.

The installation process and the erection dismantling process of the cantilever device for bridge construction are sequentially repeated along the extension direction of the bridge 2. That is, as shown in FIG. 6, the bridge 2 is sequentially extended for each construction block 3a to 3f, but the installation process and the erection demolition process of the bridge construction cantilever device are alternately performed for each construction block. Then, the bridge 2 will be erected in sequence. The construction block 3a ... will be constructed symmetrically around the column base. When dismantling the bridge 2, the installation process and the erection dismantling process of the cantilever device for bridge construction are sequentially repeated in the order of construction blocks 3f to 3a.

Further, according to the cantilever device for bridge construction according to the present embodiment, since the mesh sheet 52 of the protective material 50 has flexibility, the wind pressure can be released by deforming, and the protective material 50 can cope with strong winds. it can. Further, since the protective material 50 blocks wind and rain to some extent, the working environment is improved. Further, in the event of a typhoon, if the support frame 51 of the protective material 50 is lowered by the hanging device 10 and the mesh sheet 52 is folded downward, the wind pressure is not received, so that the protective material 50 can be prevented from being damaged. Since the mesh sheet 52 is pressed by the support frame 51, it is less likely to be blown by the wind.
Further, in the present embodiment, since the protective material 50 is separated from the temporary scaffold 40, the temporary scaffold 40 can be assembled and disassembled while the protective material 50 is suspended.

Although the embodiment for carrying out the present invention has been described above, the present invention is not intended to be limited to the above-described embodiment, and the design can be appropriately changed without departing from the spirit of the present invention. For example, in the above-described embodiment, the protective material 50 is composed of a support frame 51 at an upper end portion and a mesh sheet 52 supported by the support frame 51, but is not limited thereto. For example, a frame may be attached to the lower end of the mesh sheet 52, and the frame may be fixed to the work floor 30. Further, it may be composed of only the mesh sheet 52.
Further, in the above embodiment, the lower end of the protective material is connected to the work floor, but the present invention is not limited to this, and for example, by extending the lower end position of the protective material to the lower part of the work floor, a falling object can be removed. The protective material and the work floor do not have to be connected as long as they can be received by the work floor.

1 Cantilever for bridge construction 2 Bridge 10 Suspension device 11 Travel rail 12 Bogie 13 Suspension material 14 Lifting jig 30 Work floor 40 Temporary scaffolding 41 Support beam 50 Protective material 51 Support frame 52 Mesh sheet

Claims (3)

A cantilever device for bridge construction used for bridge erection or demolition work.
The suspension device installed on the upper part of the bridge,
The work floor installed below the bridge and
The temporary scaffolding installed on the work floor and
A cantilever device for bridge construction, which is installed on the outer peripheral edge of the work floor and is provided with a protective material suspended by the suspension device. The protective material is separated from the temporary scaffolding,
The cantilever device for bridge construction according to claim 1, wherein the lower end portion of the protective material is connected to the work floor. A method for constructing and dismantling a bridge using the cantilever device for bridge construction according to claim 1 or 2.
The process of installing the cantilever for bridge construction at the end of the bridge under construction or the end of the bridge during demolition, and the installation process of the cantilever for bridge construction.
A erection demolition step of erection of the bridge or dismantling of the bridge is provided.
In the erection and demolition process, bridge construction is performed on the inner part surrounded by the protective material.
A bridge erection and dismantling method, characterized in that the installation step of the cantilever device for bridge construction and the erection and dismantling step are repeatedly performed along the extension direction of the bridge.

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