JP6974233B2 - Floor slab replacement method and floor slab replacement device - Google Patents

Description

The present invention relates to a floor slab replacement method and a floor slab replacement device for removing an existing floor slab and installing a new floor slab.

Conventionally, when an existing deck is deteriorated in a bridge such as a general road or a highway, the deck is replaced by removing the deck from the main girder and reconstructing a new deck. .. In this case, the new deck is constructed by arranging and installing a plurality of factory-made concrete precast decks in the direction of the bridge axis (see, for example, Patent Document 1).

Hereinafter, the conventional floor slab replacement method will be described with reference to FIGS. 45 to 51. In the bridge shown in the figure, as shown in FIG. 45, existing floor slabs 1 are installed on a plurality of main girders 2 arranged at intervals in the width direction of the road, and between the main girders 2. A cross girder and an anti-tilt structure 3 are provided. In this conventional example, the case of a composite girder is shown.

First, as shown in FIG. 46, a scaffold B is temporarily installed below the existing floor slab 1. Next, the deck 1 to be removed is cut in the direction perpendicular to the bridge axis, and the deck 1 is cut in the bridge axis direction at a plurality of cutting positions. In this case, in the synthetic girder bridge, the deck concrete is included in the main cross section, and the deck 1 and the main girder 2 are firmly connected by studs (not shown), so that each main girder is as shown in FIG. 47. Cut in the bridge axis direction at position C about 100 mm away from both ends of the upper flange of 2.

Next, the cut deck concrete 1a is lifted and removed by a mobile crane. In this case, the cut portion of the deck concrete 1a is completely separated by a well-known deck peeling device (not shown) using a jack. At that time, as shown in FIG. 48, the cut deck concrete 1a is separated from the deck concrete 1b on the main girder 2 and removed.

Subsequently, as shown in FIG. 49, the deck concrete 1b remaining on the main girder 2 is crushed by using a crusher D such as a large breaker or a hand breaker, and then, as shown in FIG. 50, the main girder 2 and Reinforcing work E to reinforce the cross girder and anti-tilt structure 3 is performed in the scaffold B, and a new stud (not shown) for connecting to the new floor slab is attached on the upper flange of the main girder 2.

After removing the existing floor slab 1, a plurality of newly installed precast floor slabs 4 are arranged and installed in the direction of the bridge axis. In this case, as shown in FIG. 51, the crane vehicle F is installed on the precast deck 4 already installed, and the precast deck 4 is sequentially arranged on the main girder 2 to construct a new deck. In some cases, the crane vehicle F may be installed on the existing floor slab 1 before removal to replace the floor slab.

Japanese Unexamined Patent Publication No. 2009-264040

However, as mentioned above, in the construction method using a mobile crane to remove the existing floor slab and erection of the new floor slab, there are cases where there are sky restrictions due to the crossing road or high-pressure electric wire located above the construction site, or the adjacent in service. Use a large mobile crane if there are restrictions on the turning of the crane on the girder or crane work from the ground due to roads or neighboring structures, or if the load capacity of the existing bridge is not compatible with large heavy machinery. There was a problem that it could not be done.

The present invention has been made in view of the above problems, and an object of the present invention is not restricted by a work space above or in the width direction of a road at a construction site or by weight due to the load bearing capacity of an existing bridge. It is an object of the present invention to provide a deck slab replacement method and a deck slab replacement device capable of efficiently performing work without using a mobile crane.

The present invention is a floor slab replacement method in which an existing floor slab in a floor slab replacement section is removed from the main girder and a new precast floor slab is installed on the main girder in order to achieve the above object. The existing deck of the replacement section is cut at multiple points in the direction of the bridge axis in the direction perpendicular to the bridge axis, and a gate-shaped suspension device and a carrier that can move in the direction of the bridge axis along the rails laid on the existing deck are used. , The cut existing deck is lifted by a hanging device and placed on the transport trolley, the transport trolley on which the existing floor slab is placed is transported to a predetermined place, and then the existing deck is removed. Remove the rail from the existing deck, move the suspension device to the next deck removal position in the direction of the bridge axis, and perform the removal of the existing deck sequentially from one end to the other end of the deck replacement section in the bridge axis direction. As a result, after removing the existing deck in the deck replacement section from the main girder, a gate-shaped suspension that can move in the direction of the bridge axis along the rail laid on the main girder from which the existing deck was removed. Using the equipment and the transport trolley, the precast deck for new installation is placed on the transport trolley at a predetermined place and transported to the suspension device, and the transported precast deck is lifted by the suspension device and installed on the main girder. Next, remove the rail at the deck installation position where the precast deck is installed from the main girder, move the suspension device to the next deck installation position in the direction of the bridge axis, and replace the precast deck with the deck replacement section. A new precast deck is installed in the deck replacement section by sequentially performing from one end to the other end in the bridge axis direction.

Further, in order to achieve the above object, the present invention is a floor slab replacement device in which an existing floor slab in a floor slab replacement section is removed from the main girder and a new precast floor slab is installed on the main girder. A deck laid on an existing deck, a gate-shaped suspension device and a transport cart that can move in the direction of the bridge axis along the deck, and a deck cut in the direction perpendicular to the bridge axis at multiple points in the bridge axis direction. The existing floor slab in the replacement section is lifted by a lifting device, the lifted existing floor slab is placed on the transport trolley, the transport trolley on which the existing floor slab is placed is transported to a predetermined place, and from the existing floor slab. By moving the suspension device to the next deck removal position where the deck has been removed and performing the removal of the existing deck sequentially from one end to the other end in the bridge axis direction of the deck replacement section, the deck replacement section The existing deck is configured to be removed from the main girder, and the rail laid on the main girder from which the existing deck has been removed, and a gate-shaped suspension device that can move in the direction of the bridge axis along the rail. And equipped with a transport trolley, the precast deck for new installation is placed on the transport trolley at a predetermined place and transported to the suspension device, and the transported precast deck is lifted by the suspension device and installed on the main girder. Deck removal by moving the suspension device to the next deck installation position where the girder has been removed and performing the installation of the precast deck from one end to the other end in the bridge axis direction of the deck replacement section. It is configured to install a new precast deck in the replacement section.

As a result, the existing deck can be removed and a new precast deck can be installed by using a gate-shaped suspension device and a transport cart that can move in the direction of the bridge axis, so that work can be performed without using a crane truck. ..

According to the present invention, the floor slab can be removed and newly installed without using a crane vehicle. Even if there are restrictions on the work space in the width direction of the road due to adjacent roads or structures, or if there are restrictions on the weight due to the load capacity of the existing bridge, the deck replacement work should be carried out without these restrictions. Can be done.

A side view of the first suspension device of the floor slab replacement device showing an embodiment of the present invention. Top view of the first suspension device Front view of the first suspension device Front view of the first suspension device Side view of the second suspension device Top view of the second suspension device Front view of the second suspension device Side view of the transport trolley Top view of the transport trolley Front view of the transport trolley Side view of the bridge showing the deck removal process Side view of the bridge showing the deck removal process Side view of the bridge showing the deck removal process Floor plan of the bridge showing the deck removal process Side view of the floor slab replacement device showing the floor slab removal process Side view of the floor slab replacement device showing the floor slab removal process Side view of the floor slab replacement device showing the floor slab removal process Side view of the floor slab replacement device showing the floor slab removal process Side view of the floor slab replacement device showing the floor slab removal process Side view of the floor slab replacement device showing the floor slab removal process Side view of the floor slab replacement device showing the floor slab removal process Side view of the floor slab replacement device showing the floor slab removal process Side view of the floor slab replacement device showing the floor slab removal process Side view of the floor slab replacement device showing the floor slab removal process Side view of the floor slab replacement device showing the floor slab removal process Side view of the bridge showing the new floor slab construction process Side view of the bridge showing the new floor slab construction process Side view of the bridge showing the new floor slab construction process Side view of the bridge showing the new floor slab construction process Side view of the floor slab replacement device showing the new floor slab installation process Side view of the floor slab replacement device showing the new floor slab installation process Side view of the floor slab replacement device showing the new floor slab installation process Side view of the floor slab replacement device showing the new floor slab installation process Side view of the floor slab replacement device showing the new floor slab installation process Side view of the floor slab replacement device showing the new floor slab installation process Side view of the floor slab replacement device showing the new floor slab installation process Side view of the floor slab replacement device showing the new floor slab installation process Side view of the floor slab replacement device showing the new floor slab installation process Side view of the floor slab replacement device showing the new floor slab installation process Side view of the floor slab replacement device showing the new floor slab installation process Side view of the bridge showing the new floor slab construction process Floor plan of the bridge showing the new floor slab construction process Flow chart showing the floor slab removal process Flow chart showing the new floor slab installation process Front view showing the conventional floor slab replacement process Front view showing the floor slab replacement process Front view showing the floor slab replacement process Front view showing the floor slab replacement process Front view showing the floor slab replacement process Front view showing the floor slab replacement process Front view showing the floor slab replacement process

1 to 44 show an embodiment of the present invention, and show a deck replacement method and a deck replacement device for removing an existing deck from a bridge and installing a new deck. .. 1, FIG. 5, FIG. 8, FIGS. 15 to 25, and FIGS. 30 to 40 are side views of the floor slab replacement device as viewed from the direction of arrow AA in FIG.

The bridge 10 shown in the figure is composed of a plurality of piers 11 arranged at intervals in the direction of the bridge axis, a main girder 12 supported by the pier 11, and an existing deck 13 erected on the main girder 12. Therefore, in the present embodiment, the existing floor slab 13 is cut into a plurality of pieces, removed, and replaced with a new precast floor slab 14.

The floor slab replacement device of the present embodiment includes the gate-type first and second hanging devices 20 and 30 for lifting and lowering the existing floor slab 13 or the precast floor slab 14, and the first lifting device 20. A transport trolley 40 for transporting the floor slabs 13 and 14 to and from the second suspension device 30 is provided, and the first suspension device 20 and the transport trolley 40 move in the bridge axis direction along the rail 50. It has become.

The first suspension device 20 includes a pair of left and right first frames 21 extending in the bridge axis direction, and a pair of left and right second frames extending downward from one end side and the other end side of each first frame 21 in the bridge axis direction. The frame 22, a pair of left and right first guide rails 23 extending in the bridge axis direction, an annular second guide rail 24 moving in the bridge axis direction along the first guide rail 23, and a second guide rail. It is composed of a suspension balance 25 that rotates along 24 and a plurality of self-propelled traveling units 26 that travel by engaging with the rail 50.

Each first frame 21 is formed in a cantilever shape having both ends extending longer in the bridge axis direction than each second frame 22, and is connected to each other by a plurality of cross beams 21a extending in the direction perpendicular to the bridge axis. ..

The upper end of each second frame 22 is connected to the first frame 21, and the lower end side is connected to each other by a plurality of cross beams 22a extending in the bridge axis direction.

Each first guide rail 23 is formed slightly longer than the first frame 21, and is fixed to each cross beam 21a of each first guide rail 23.

The second guide rail 24 is connected to each first guide rail 23 via a support mechanism 24a at four points in the circumferential direction, and each support mechanism 24a connects one end side to the other end of each first guide rail 23. It is designed to move to the side. As each support mechanism 24a, for example, a well-known electric trolley can be used.

The suspension balance 25 is formed so as to extend linearly in the horizontal direction, and two points in the longitudinal direction are connected to the second guide rail 24 via the support mechanism 25a, respectively, and the second guide rail is connected by each support mechanism 25a. It is designed to rotate in the circumferential direction of 24. As each support mechanism 25a, for example, a well-known geared trolley can be used. Further, the suspension balance 25 is provided with a plurality of suspension members 25b at intervals in the longitudinal direction of the suspension balance 25, and the floor slabs 13 and 14 are suspended by the suspension members 25b. As each suspension member 25b, for example, a well-known manual chain block can be used.

Each traveling unit 26 is provided at the lower end of each second frame 22. The traveling unit 26 is provided with a pair of front and rear wheels 26a, and each wheel 26a is driven by a motor (not shown).

The second suspension device 30 includes a pair of left and right first frames 31 extending in the bridge axis direction, and a pair of left and right second frames extending downward from one end side and the other end side of each first frame 31 in the bridge axis direction. It is composed of a frame 32 and a suspension balance 33 extending in the direction of the bridge axis.

Each of the first frames 31 is formed so that both ends thereof are located substantially at the upper ends of the second frames 32, and is connected to each other by a plurality of cross beams 31a extending in the direction perpendicular to the bridge axis.

The upper end of each second frame 32 is connected to the first frame 31, and the lower end side is connected to each other by a plurality of cross beams 32a extending in the bridge axis direction.

The suspension balance 33 is formed so as to extend linearly in the horizontal direction, and is fixed to each cross beam 31a of the first frame 31 so as to be located at the center in the direction perpendicular to the bridge axis. A plurality of suspension members 33a are provided on the suspension balance 33 at intervals in the longitudinal direction of the suspension balance 33, and the floor slabs 13 and 14 are suspended by the suspension members 33a. As each suspension member 33a, for example, a well-known manual chain block can be used.

The transport carriage 40 is a plurality of self-propelled type traveling by engaging with a pair of left and right first frames 41 extending in the direction of the bridge axis, a pair of front and rear second frames 42 extending in the direction perpendicular to the bridge axis, and a rail 50. It is composed of the traveling unit 43 of the above.

Each of the first frames 41 is formed so that both ends extend longer in the bridge axis direction than each second frame 42, and the intervals are shorter than the length L of the decks 13 and 14 in the bridge axis direction. It is placed in place.

Each second frame 42 is bent so that the center side in the direction perpendicular to the bridge axis is located below both ends, and each first frame 41 is fixed to the center side in the direction perpendicular to the bridge axis.

Each traveling unit 43 is provided at both ends of each second frame 42. The traveling unit 43 is provided with a pair of front and rear wheels 43a, and each wheel 43a is driven by a motor (not shown).

The rail 50 has a rail 51 arranged at right angles to each other in the direction perpendicular to the bridge axis, and a fixing member 52 to which the rail 51 is fixed at the upper end, and the rail 51 and the fixing member 52 are on the existing deck 13 or. A pair of existing floor slabs 13 are arranged on the main girder 12 from which the existing deck 13 has been removed at right angles to each other in the direction perpendicular to the bridge axis. The rail 50 is configured such that a rail 51 and a fixing member 52 formed in a length 2L that is twice the length L in the bridge axial direction of the decks 13 and 14 are connected in the bridge axial direction. In this case, the left and right rails 51 and the fixing members 52 are arranged at equal intervals with the main girders 12 at both ends in the direction perpendicular to the bridge axis, and the left and right fixing members 52 are connected to each other via a plurality of reinforcing members 53. Further, when the rail 50 is installed on the main girder 12 from which the existing floor slab 13 has been removed, a pillow wood 54 having a height equal to that of the floor slab 13 is arranged between the fixing member 52 and the main girder 12.

Next, a floor slab replacement method using the floor slab replacement device of the present embodiment will be described with reference to FIGS. 11 to 42. Here, as shown in FIG. 11, a case is shown in which the existing deck 13 in the deck replacement section N of the bridge 10 is removed and a new precast deck 14 is newly installed. In this embodiment, the case where the existing floor slab 13 is removed in the synthetic girder in which the floor slab 13 and the main girder 12 are connected by a stud (not shown) is shown.

First, as shown in FIG. 12, the deck 13 to be removed is cut in the direction perpendicular to the bridge axis at a plurality of positions C in the bridge axis direction so that the length in the bridge axis direction after cutting is L. It is assumed that the length L in the bridge axis direction of the deck 13 is sufficiently shorter than the length W in the direction perpendicular to the bridge axis.

Next, as shown in FIGS. 13 and 14, the rail 50 is laid on the existing deck 13 cut in the direction perpendicular to the bridge axis. At that time, from the position excluding the two existing floor slabs 13 on one end side of the floor slab replacement section N to the other end side of the floor slab replacement section N and on the existing floor slab 13 outside the floor slab replacement section. The rail 50 is laid. The area outside the floor slab replacement section may be on a newly installed floor slab for which the floor slab replacement work has already been completed.

Subsequently, as shown in FIG. 15, the first suspension device 20, the second suspension device 30, and the transport carriage 40 are arranged. The first suspension device 20 is arranged so as to be able to travel on the rail 50, and is located on one end side of the deck replacement section N. The second suspension device 30 is arranged on the existing deck 13 outside the deck replacement section, and each second frame 32 is installed so as to be located outside the rail 50. The transport carriage 40 is arranged so as to be able to travel on the rail 50, and is adapted to reciprocate between the first suspension device 20 and the second suspension device 30.

Next, the process of removing the existing floor slab 13 will be described. First, the concrete between the existing deck 13 located on the most end side of the deck replacement section N and the main girder 12 is cut together with the stud using a wire saw or the like.

Subsequently, as shown in FIG. 16, the suspension balance 25 of the first suspension device 20 is positioned on one end side of the first suspension device 20, and each suspension member 25b is placed at one end of the floor slab replacement section N. The existing floor slab 13 is connected to the existing floor slab 13 located on the side via a rope 25c, and the existing floor slab 13 is lifted by each hanging member 25b as shown in FIG. At that time, the direction of the suspension balance 25 is such that the longitudinal direction is perpendicular to the bridge axis. Further, the transport carriage 40 is located on the other end side of the first suspension device 20.

Next, as shown in FIG. 18, the suspension balance 25 of the first suspension device 20 is rotated 90 degrees so that the longitudinal orientation of the suspension balance 25 and the existing deck 13 is perpendicular to the bridge axis, and FIG. 19 As shown in the above, the suspension balance 25 and the existing deck 13 are moved to the other end side of the first suspension device 20 by the second guide rail 24.

After that, as shown in FIG. 20, the existing floor slab 13 is suspended from the suspension balance 25 onto the transport trolley 40, and as shown in FIG. 21, the transport trolley 40 on which the existing floor slab 13 is mounted is moved to the second suspension device 30. Moving.

Subsequently, as shown in FIG. 22, after the existing floor slab 13 is lifted by each hanging member 33a of the hanging balance 33 of the second hanging device 30, the transport carriage 40 is moved to the other end side of the first hanging device 20. Moving. At that time, the first suspension device 20 is moved toward the other end side of the floor slab replacement section N by the length L of one of the existing floor slabs 13, and the suspension balance 25 is moved to the first suspension device 20. Move to one end side of.

Next, as shown in FIG. 23, the existing floor slab 13 is suspended from the suspension balance 33 on the transport vehicle 60 (truck) that has entered the inside of the second suspension device 30, and the existing floor slab 13 is externally mounted by the transport vehicle 60. Carry out to. Further, the suspension balance 25 of the first suspension device 20 is rotated by 90 degrees so that the direction in the longitudinal direction is the bridge axis direction.

After that, the concrete between the next existing floor slab 13 and the main girder 12 is cut together with the stud using a wire saw or the like in the same manner as described above, and each suspension of the first suspension device 20 is suspended as shown in FIG. 24. The next existing floor slab 13 is lifted by the member 25b. After removing the second existing floor slab 13 by the same process as described above, as shown in FIG. 25, the first suspension device 20 is used in the floor slab replacement section by the length L of one of the existing floor slabs 13. While moving toward the other end side of N, the rail 51 and the fixing member 52 of the rail 50 are removed by one. That is, as shown in FIG. 26, the first hanging device 20 is sequentially moved while repeating the step of removing the rail 51 and the fixing member 52 one by one every time two existing floor slabs 13 are removed. All the existing floor slabs 13 in the replacement section N are removed.

Next, a process of installing a new precast deck 14 on the main girder 12 of the deck replacement section N from which all the existing deck 13 has been removed will be described. The precast deck 14 is formed so that the length L in the bridge axis direction when installed on the main girder 12 is shorter than the length W in the direction perpendicular to the bridge axis.
First, the pillow wood 54 is installed on the main girder 12 as shown in FIG. 27, and the rail 50 is laid on the pillow wood 54 as shown in FIGS. 28 and 29. At that time, the rail 50 is installed with a space from one end side of the floor slab replacement section N by the length of 2 L for two newly installed precast floor slabs 14.

Subsequently, as shown in FIG. 30, the first suspension device 20, the second suspension device 30, and the transport carriage 40 are arranged. The first suspension device 20 is arranged so as to be able to travel on the rail 50, and is located on one end side of the deck replacement section N. The second suspension device 30 is arranged on the existing deck 13 outside the deck replacement section, and each second frame 32 is installed so as to be located outside the rail 50. The transport carriage 40 is arranged so as to be able to travel on the rail 50, and moves between the first suspension device 20 and the second suspension device 30.

Next, as shown in FIG. 31, the transport vehicle 60 has the suspension balance 25 of the first suspension device 20 positioned on the other end side of the first suspension device 20 and has entered the inside of the second suspension device 30. The precast floor slab 14 is lifted by the hanging balance 33.

Subsequently, the transport vehicle 60 is evacuated from the second suspension device 30, and the transport trolley 40 is moved to the second suspension device 30 as shown in FIG. 32, and the precast floor slab 14 is transferred from the suspension balance 33 to the transport trolley. Suspend on 40.

After that, as shown in FIG. 33, the transport trolley 40 on which the precast floor slab 14 is mounted is moved from the second suspension device 30 to the other end side of the first suspension device 20, and the suspension balance of the first suspension device 20. The precast floor slab 14 is lifted from the transport trolley 40 by the 25, and the suspension balance 25 on which the precast floor slab 14 is suspended is moved to one end side of the first lifting device 20. Further, the next precast deck 14 is lifted by the suspension balance 33 from the transport vehicle 60 that has entered the inside of the second suspension device 30.

Next, as shown in FIG. 34, the suspension balance 25 of the first suspension device 20 is rotated 90 degrees and conveyed so that the longitudinal orientation of the suspension balance 25 and the precast deck 14 is the direction perpendicular to the bridge axis. The dolly 40 is moved from the first suspension device 20 to the second suspension device 30.

After that, as shown in FIG. 35, the precast floor slab 14 is suspended from the suspension balance 25 and placed on the main girder 12 on the most end side of the floor slab replacement section N, and the second suspension device 30 is used. The precast floor slab 14 is hung from the suspension balance 33 onto the transport trolley 40. Further, in the first suspension device 20, as shown in FIG. 36, the suspension balance 25 after suspending the precast deck 14 is rotated by 90 degrees so that the direction in the longitudinal direction is perpendicular to the bridge axis.

Subsequently, as shown in FIG. 37, the first suspension device 20 is moved toward the other end side of the floor slab replacement section N by the length L of one of the existing floor slabs 13, and the suspension balance 25 is used. Is moved to one end side of the first suspension device 20, and the transport carriage 40 on which the next precast deck 14 is placed is moved to the other end side of the first suspension device 20.

After that, as shown in FIG. 38, the precast deck 14 is lifted from the transport carriage 40 by the suspension balance 25 of the first suspension device 20, and the suspension balance 25 on which the precast deck 14 is suspended is lifted by the first suspension device. Move to one end side of 20. Further, the next precast deck 14 is lifted by the suspension balance 33 from the transport vehicle 60 that has entered the inside of the second suspension device 30.

Next, as shown in FIG. 39, the suspension balance 25 of the first suspension device 20 is rotated 90 degrees and suspended so that the longitudinal orientation of the suspension balance 25 and the precast deck 14 is the direction perpendicular to the bridge axis. The second precast deck 14 is hung from the balance 25 and placed on the main girder 12. Further, the next precast deck 14 is suspended from the suspension balance 33 of the second suspension device 30 onto the transport carriage 40.

After that, as shown in FIG. 40, the first suspension device 20 is moved toward the other end side of the floor slab replacement section N by the length L of one of the existing floor slabs 13, and the rail of the rail 50. Remove only one 51 and one fixing member 52. That is, FIG. 41 and FIG. 42 show that the first suspension device 20 is sequentially moved while repeating the step of removing the rail 51 and the fixing member 52 one by one every time two new precast floor slabs 14 are erected. As described above, a precast floor slab 14 is newly installed in the entire floor slab replacement section N.

As described above, according to the present embodiment, the existing deck 13 of the deck replacement section N is provided at a plurality of locations in the bridge axis direction so that the length L in the bridge axis direction is shorter than the length W in the direction perpendicular to the bridge axis. The cut existing deck 13 is first suspended by using a gate-shaped first suspension device 20 and a transport trolley 40 that can be cut in the direction perpendicular to the bridge axis and moved in the bridge axis direction on the existing deck 13. While being lifted by the device 20, the lifted existing deck 13 is rotated so that the longitudinal direction is the bridge axis direction and mounted on the transport trolley 40, and the transport trolley 40 on which the existing deck 13 is mounted is placed at a predetermined transport location. The first suspension device 20 was moved to the next deck removal position so that the existing deck 13 could be removed sequentially from one end to the other end of the deck replacement section N in the bridge axis direction. Therefore, it is not necessary to lift the existing deck 13 by a crane vehicle, and the existing deck 13 to be removed can be transported in a direction smaller than the road width. As a result, the deck removal work can be performed without using a crane vehicle, so if there are sky restrictions due to crossing roads or high-voltage electric wires located above the construction site, or if there are adjacent roads or nearby structures in service. Even if there are restrictions on the work space in the road width direction, or if there are restrictions on the weight due to the load capacity of the existing bridge, the existing floor slab 13 can be removed without these restrictions.

Further, after removing the existing deck 13 in the deck replacement section N, the first suspension device 20 and the transport trolley 40 that can move in the bridge axis direction on the main girder 12 from which the existing deck 13 has been removed are installed. A new precast deck 14 formed so that the length L in the bridge axis direction is shorter than the length W in the direction perpendicular to the bridge axis is mounted on the transport trolley 40 so that the longitudinal direction is the bridge axis direction. The precast deck 14 that has been placed and transported to the first suspension device 20 is lifted by the first suspension device 20, and the lifted precast deck 14 is rotated so that the longitudinal direction is perpendicular to the bridge axis. The precast deck 14 is installed on the main girder by suspending it on the main girder 12, and the first hanging device 20 is moved to the next deck installation position to install the precast deck 14 on the deck. Since the replacement section N is sequentially performed from one end to the other end in the bridge axis direction, it is not necessary to lift the precast deck 14 by a crane car, and the width of the newly installed precast deck 14 is smaller than the road width. Can be transported by. As a result, the floor slab installation work can be performed without using a crane car. Even if there are restrictions on the work space in the road width direction due to the adjacent roads and structures inside, or if there are restrictions on the weight due to the load capacity of the existing bridge, the precast deck 14 will be newly installed without these restrictions. It can be carried out.

Further, using the gate-shaped second suspension device 30 arranged at the transport location, the existing floor slab 13 is transshipped from the transport trolley 40 to the transport vehicle 60, and the precast deck slab from the transport vehicle 60 to the transport trolley 40. Since the transshipment of 14 is performed, these transshipment operations can also be performed without using a crane vehicle. In this case, the floor slab is removed or installed by the first suspension device 20, and at the same time, the floor slab is transshipped between the transport trolley 40 and the transport vehicle 60 by the second suspension device 30. , It is possible to improve the efficiency of the entire floor slab replacement work.
Further, since the first and second suspension devices 20 and 30 and the transport trolley 40 are moved in the direction of the bridge axis along the rail 50 installed in the deck replacement section N, the first and second suspension devices 20 and 30 are suspended. The devices 20 and 30 and the transport trolley 40 can always be stably moved by the rail 50, which is extremely advantageous for work on the main girder 12 after removing the floor slab where general vehicles such as trucks cannot travel.

Further, since the first suspension device 20 is sequentially moved from one end side to the other end side in the bridge axis direction of the floor slab replacement section N while partially removing the rail 50, the existing floor slab 13 to be removed is removed. The rail 50 can be installed on the main girder 12 on which the precast floor slab 14 is installed, and the work using the rail 50 can be performed within the range of the road width or less.

In the above embodiment, the case where the existing floor slab 13 of the synthetic girder is removed is shown, but the present invention can also be applied to the case where the non-synthetic girder bridge is removed. In this case, since the non-synthetic girder bridge does not have a slip-preventing member that firmly connects the deck and the main girder, the step of cutting the slip-preventing member between the deck 13 and the main girder 12 as in the above embodiment. Is unnecessary.

Further, in the above embodiment, each time a plurality (for example, two) of existing floor slabs 13 or precast floor slabs 14 having a length L in the direction of the bridge axis are removed or installed, a rail 51 having a length of 2 L and a fixing member 52 are used. Although it is shown that the existing floor slab 13 or the precast floor slab 14 is removed one by one, the rail 51 and the fixing member 52 having a length L may be removed one by one every time one of the existing floor slabs 13 or the precast floor slab 14 is removed or installed. ..

10 ... Bridge, 12 ... Main girder, 13 ... Existing floor slab, 14 ... Precast floor slab, 20 ... First suspension device, 30 ... Second suspension device, 40 ... Transport trolley, 50 ... Rail, 60 ... Transport vehicle ..

Claims (7)

In the floor slab replacement method, the existing floor slab in the floor slab replacement section is removed from the main girder and a new precast floor slab is installed on the main girder.
The existing deck in the floor slab replacement section is cut at multiple points in the bridge axis direction in the direction perpendicular to the bridge axis.
Using a gate-shaped suspension device and a transport trolley that can move in the direction of the bridge axis along the rails laid on the existing deck.
The cut existing floor slab is lifted by a lifting device and placed on a transport trolley.
In addition to transporting the transport trolley on which the existing floor slab is placed to the specified location,
Next, remove the rail at the floor slab removal position where the existing floor slab is removed from the existing floor slab.
By moving the suspension device to the next floor slab removal position in the bridge axis direction and sequentially removing the existing floor slab from one end to the other end in the bridge axis direction of the floor slab replacement section, the existing floor slab replacement section is already installed. After removing the deck from the main girder
Using a gate-shaped suspension device and a transport trolley that can move in the direction of the bridge axis along the rails laid on the main girder from which the existing floor slab has been removed.
Place the precast deck for new installation on the transport trolley at the designated place and transport it to the suspension device.
The transported precast deck is lifted by a hanging device and installed on the main girder.
Next, remove the rail of the floor slab installation position where the precast floor slab is installed from the main girder, and remove it.
By moving the suspension device to the next deck installation position in the bridge axis direction and sequentially installing the precast deck from one end to the other end in the bridge axis direction of the deck replacement section, a new deck replacement section will be created. A floor slab replacement method characterized by installing a variety of precast floor slabs. When cutting the existing deck in the floor slab replacement section, the existing deck is cut so that the length in the bridge axis direction is shorter than the length in the direction perpendicular to the bridge axis.
The floor slab replacement method according to claim 1, wherein the existing floor slab lifted by the suspension device is rotated horizontally so that the longitudinal direction is the bridge axis direction and placed on a transport carriage. When installing the precast deck for new installation, the precast deck formed so that the length in the bridge axis direction is shorter than the length in the direction perpendicular to the bridge axis is transported so that the longitudinal direction is the bridge axis direction. Place it on the floor and transport it to the suspension device.
The floor slab replacement method according to claim 1 or 2, wherein the precast floor slab lifted by the suspension device is horizontally rotated so that the longitudinal direction is perpendicular to the bridge axis and installed on the main girder. .. It is characterized by transshipping the existing floor slab from the transport vehicle to the transport vehicle and transshipping the precast floor slab from the transport vehicle to the transport vehicle by using another gate-type suspension device arranged at the predetermined location. The floor slab replacement method according to claim 1, 2 or 3. In the floor slab replacement device that removes the existing floor slab in the floor slab replacement section from the main girder and installs a new precast floor slab on the main girder.
The rails laid on the existing floor slab and
Equipped with a gate-shaped suspension device and a transport cart that can move in the direction of the bridge axis along the rails.
The existing floor slab of the floor slab replacement section cut in the direction perpendicular to the bridge axis at multiple points in the bridge axis direction is lifted by a lifting device, and at the same time.
Place the lifted existing floor slab on the transport trolley and place it on the transport trolley.
In addition to transporting the transport trolley on which the existing floor slab is placed to the specified location,
By moving the suspension device to the next deck removal position where the rails have been removed from the existing deck, and performing the removal of the existing deck sequentially from one end to the other end in the bridge axis direction of the deck replacement section, the floor In addition to being configured to remove the existing floor slab in the plate replacement section from the main girder,
The rails laid on the main girder from which the existing floor slab was removed,
Equipped with a gate-shaped suspension device and a transport trolley that can move in the direction of the bridge axis along the rails.
Place the precast deck for new installation on the transport trolley at the designated place and transport it to the suspension device.
The transported precast deck is lifted by a hanging device and installed on the main girder.
By moving the suspension device to the next deck installation position where the rails have been removed from the main girder and performing the installation of the precast deck in sequence from one end to the other end in the bridge axis direction of the deck replacement section, the deck is installed. A deck replacement device characterized by being configured to install a new precast deck in the replacement section. The floor slab replacement device according to claim 5, wherein the suspension device is configured so that the existing floor slab or precast floor slab that has been lifted can be rotated in the horizontal direction. It is characterized by being placed in the above-mentioned predetermined location and equipped with another gate-type suspension device that transships the existing floor slab from the transport vehicle to the transport vehicle and transships the precast deck from the transport vehicle to the transport vehicle. The floor slab replacement device according to claim 5 or 6.

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