Method for replacing bridge decks

Abstract

To efficiently replace the bridge deck. [Solution] The lifting and moving machine 10 moves sequentially along the row of existing floor slabs 2 in the direction of the replacement work, while repeating the following steps (1) to (4). (1) The lifting and moving machine 10 has a lifting point at a position that extends in the opposite direction to the direction of travel, and lifts and removes the existing floor slabs 2 (a). (2) After an empty transport vehicle 20 enters below the lifting point of the lifting and moving machine 10, the lifting and moving machine 10 lowers the existing floor slabs 2 onto the transport vehicle 20, and the transport vehicle 20 exits with the existing floor slabs 2 loaded (b to c). (3) After a transport vehicle 20 for transporting new floor slabs enters below the lifting point of the lifting and moving machine 10, the lifting and moving machine 10 lifts the new floor slabs 2N from the transport vehicle 20, and the transport vehicle 20 exits empty (d to f). (4) The lifting and moving machine 10 returns to the position where the existing deck slab was removed, and the new deck slab 2N is lowered and installed in the position where the existing deck slab 2 was removed (g).

Description

Technical Field

[0001] The present invention relates to a method for replacing a floor slab when replacing a floor slab (removing an existing floor slab and installing a new floor slab in place thereof) in an existing bridge or the like.

Background Art

[0002] The floor slab is made of precast concrete and is arranged on the main girder (bridge girder) of a bridge to form the foundation of the road surface. For such a floor slab replacement may be required due to reasons such as corrosion of the internal reinforcing bars due to long-term use. (Removing the existing floor slab and installing a new floor slab).

[0003] As a conventional method for replacing a floor slab, the method described in Patent Document 1 is known. The floor slab replacement machine used here is a self-propelled gantry structure formed by connecting gantry frames before and after in the bridge axis direction and straddling the floor slab replacement position with the front and rear gantry frames, two sets of rails arranged in parallel along the ceiling of the gantry structure, and first and second lifting devices (chain blocks) suspended on each rail and movable.

[0004] The first lifting device is for carrying in and installing a new floor slab, and the second lifting device is for removing and carrying out an existing floor slab. These can pass each other in opposite directions in the bridge axis direction while the floor slab is lifted. Also, a transport vehicle such as a trailer is used for carrying in a new floor slab and carrying out an existing floor slab.

[0005] In the floor slab replacement method using the above floor slab replacement machine, it is possible to simultaneously perform the transfer of the new floor slab from the carrying-in position (lifting position from the trailer) by the first lifting device to the replacement position (hanging and installing position of the new floor slab), and the transfer of the existing floor slab from the replacement position (lifting and removing position of the existing floor slab) by the second lifting device to the carrying-out position (lifting position to the trailer). Thus, the carrying-in and installation of the new floor slab and the removal and carrying-out of the existing floor slab can be carried out in parallel.

Prior Art Documents

[0006] [Patent Document 1] Japanese Patent Publication No. 2018-100564 [Overview of the project] [Problems that the invention aims to solve]

[0007] In the deck replacement method described in Patent Document 1, the deck replacement machine straddles the deck installation location, with one portal frame resting on the existing deck before removal, while the other portal frame resting on the newly installed deck immediately after installation. Therefore, this places a significant load on the newly installed deck slab immediately after installation.

[0008] Generally, precast concrete floor slabs are installed with a predetermined gap between them, and the internal reinforcing bars (anchoring joints) protrude from both slabs into this gap. Therefore, the construction is completed by pouring infill concrete (mortar) into this gap. Therefore, immediately after installation, the deck slab is in an incomplete state, and it may not be advisable to apply the load of the deck slab replacement machine to it.

[0009] Furthermore, the deck slab replacement method described in Patent Document 1 requires two lifting devices for a single deck slab replacement machine, and also requires the devices to be able to pass each other, which has the problem of making the configuration of the deck slab replacement machine complex.

[0010] In view of these circumstances, the present invention aims to provide a method for replacing a deck slab that does not place a load on the newly installed deck slab immediately after installation and can be implemented with a relatively simple configuration. [Means for solving the problem]

[0011] The present invention relates to a method for replacing deck slabs, which involves using a lifting and moving machine capable of lifting and moving deck slabs to sequentially replace a row of deck slabs in one direction of travel. The lifting and moving machine moves along the rows of existing deck slabs and has a lifting point at a position that extends from the lifting and moving machine in the direction opposite to the direction of the deck replacement work. The aforementioned replacement work is, (1) The existing deck slab removal process involves lifting and removing the existing deck slab using the lifting and moving machine, (2) The lifting and moving machine lifts the existing floor slab and moves in the direction of the replacement work, a transport vehicle for removing the existing floor slab is positioned below the lifting point of the lifting and moving machine, and thereafter the lifting and moving machine lowers the existing floor slab onto the transport vehicle, and the existing floor slab is loaded onto the transport vehicle and removed, in an existing floor slab removal process, (3) A transport vehicle for transporting the new deck slab is positioned below the lifting point of the lifting machine, the lifting machine then lifts the new deck slab from the transport vehicle, and then the transport vehicle exits in a new deck slab transport process, (4) A new floor slab installation process in which the lifting and moving machine moves in the opposite direction to the direction of the replacement work and lowers and installs the new floor slab, Includes. [Effects of the Invention]

[0012] According to the present invention, the lifting and moving machine only moves on the existing deck slab, and the lifting and moving machine does not place any load on the new deck slab. Furthermore, since the operation can basically be carried out with a single lifting and moving machine, and there is only one lifting point, and it is not necessary to move that lifting point relative to the lifting and moving machine, it can be carried out with a simple configuration, which can reduce costs and other factors. [Brief explanation of the drawing]

[0013] [Figure 1] A front view showing an example of bridge deck replacement work as one embodiment of the present invention. [Figure 2] Plan and side view of the above construction example. [Figure 3]Side view showing the procedure of the floor slab replacement work [Figure 4] Plan view showing the procedure of the floor slab replacement work [Figure 5] Explanatory drawing of the floor slab replacement pattern when using two hoisting and moving machines

Mode for Carrying Out the Invention

[0014] Hereinafter, embodiments of the present invention will be described in detail. FIG. 1 is a front view showing a construction example of a bridge to be replaced with a floor slab as an embodiment of the present invention. Further, FIG. 2 is a (a) plan view and (b) side view of the same construction example.

[0015] Regarding the reconstruction of a bridge by replacing the floor slab, since it is targeted at a road in use, minimizing social losses due to traffic restrictions and the like associated with the construction becomes the most important issue. For this reason, the replacement of the floor slab in this embodiment is a so-called "half-section construction".

[0016] That is, when the bridge to be replaced with a floor slab consists of main girders (bridge girders) 1 made of four parallel H-shaped steels, and the floor slabs 2 are arranged in two rows to form two traffic lanes A and B, one side at a time, for example, first perform the floor slab replacement work for traffic lane A, and during this time, allow general vehicles in traffic lane B to pass. In this case, a temporary protective fence 3 is installed in the middle (on the end of the floor slab of traffic lane B).

[0017] FIG. 2 also shows the basic pattern of the floor slab replacement work by one hoisting and moving machine as an embodiment of the present invention. That is, using a hoisting and moving machine 10 capable of hoisting and moving the floor slab, the replacement work is sequentially performed in one traveling direction (the direction of the arrow in FIG. 2) for the rows of floor slabs. In other words, the replacement work is sequentially performed from one end to the other end of the floor slab replacement area (the row of existing floor slabs).

[0018] Furthermore, the direction of the deck replacement work (direction of the arrow in Figure 2) is the basic direction of movement for the lifting and moving machine 10. Therefore, when the lifting and moving machine 10 moves to the left in Figure 2, it is called moving forward, and conversely, when it moves to the right, it is called moving backward. Also, in Figure 2, the left side of the lifting and moving machine 10 is the front, and the right side is the rear.

[0019] Furthermore, transport vehicles 20 such as trailers or trucks are used to transport the existing deck slabs removed by the lifting and moving machine 10, and to transport the new deck slabs to be installed by the lifting and moving machine 10. In this case, the transport vehicle 20 can travel on lane B, which is in use, to transport out the existing deck slab and bring in the new deck slab while the deck slab replacement work is being carried out on lane A.

[0020] Next, the lifting and moving machine 10 and transport vehicle 20 used for deck replacement work in this embodiment will be described in more detail with reference to Figures 1 and 2.

[0021] The lifting and moving machine 10 has a gantry-type structure, is supported on the existing floor slab 2 by its left and right ground contact points (12), and has a space 13 between the left and right ground contact points through which a transport vehicle 20 can pass.

[0022] In this embodiment, the left and right contact points are composed of wheels 12. This allows the vehicle to travel on the contact points, and the contact points can also serve as the travel points.

[0023] Furthermore, the wheels 12 in this embodiment are track wheels and run on a pair of rails 11 laid on rows of existing deck slabs 2 via steel sleepers (not shown). By using track wheels in this way, the position of the lifting and moving machine 10 and the position of the passage space 13 can be stabilized during bridge replacement work. However, this does not prevent the use of tire-type wheels 12, thereby eliminating the need for rail laying work.

[0024] The lifting and moving machine 10 also moves along the rows of existing deck slabs 2 and has a lifting point (lifting device 15) located at a position that extends from the main body of the lifting and moving machine 10 in the opposite direction (rearward) to the direction of progress of the deck slab replacement work. Therefore, the lifting and moving machine 10 includes a girder 14 supported on the upper part of its main body and extending backward, and a lifting device 15 provided on the tip side of the girder 14.

[0025] The lifting device 15 includes at least a sheave or wire feed section, and a power unit such as a winch is linked to the lifting device 15 via the sheave or the like.

[0026] The lifting device 15 is capable of lifting the existing floor slab for removal, lowering the removed existing floor slab onto a transport vehicle for removal, lifting the new floor slab from a transport vehicle for delivery, and lowering the new floor slab for installation.

[0027] In this configuration, the lifting device 15 is supported by the girder 14, and the girder 14 extends behind the lifting and moving machine 10. Therefore, the lifting and lowering operations described above can be performed without moving the lifting device 15 forward or backward.

[0028] The transport vehicle 20 will be a tire-type trailer or truck, etc. Therefore, it will be able to travel on public roads. However, this does not preclude the use of a dedicated trolley.

[0029] Next, the procedure for replacing the deck slab in this embodiment will be explained with reference to Figures 3 and 4. Figure 3 is a side view showing the procedure for replacing the bridge deck, and Figure 4 is a plan view showing the procedure for replacing the bridge deck. Note that (a) to (h) in Figure 3 and (a) to (h) in Figure 4 correspond to each other. Also, for the sake of simplicity, the rails 11 are not shown in Figures 3 and 4. In addition, the new bridge deck is denoted "2N" in relation to the existing bridge deck 2.

[0030] Furthermore, in Figures 3 and 4, the deck replacement work proceeds from the right end to the left. Therefore, to the right of the current deck replacement position in Figures 3 and 4, there is a newly installed deck slab 2N already placed on the main girder 1, and to the left, there is the existing deck slab 2 before removal. Then, the existing deck slab 2 will be removed from the position adjacent to the most recently installed new deck slab 2N, and the new deck slab 2N will be installed in its place.

[0031] In Figures 3(a) and 4(a), the lifting and moving machine 10 moves to a position on the existing deck slab 2, which is close to the removal position of the existing deck slab, i.e., the deck slab replacement position, where the lifting point (lifting device 15) is above the deck slab replacement position.

[0032] The lifting and moving machine 10 lifts the existing deck slab 2 from above the main girder 1 at the location where the existing deck slab is to be removed, and removes it. At this time, the transport vehicle 20 for removing the existing deck slab is empty and waiting in front of the lifting and moving machine 10 (to the left in the diagram).

[0033] The steps shown in Figures 3(a) and 4(a) correspond to the existing deck slab removal process, in which the existing deck slab 2 is lifted and removed by the lifting and moving machine 10.

[0034] Next, as shown in Figures 3(b) and 4(b), the lifting and moving machine 10 moves forward to the handover position while still holding the removed existing floor slab 2. The transport vehicle 20 enters and positions itself behind the lifting and moving machine 10 (below the lifting point) by passing under the lifting and moving machine 10 (through a passageway). Then, the lifting and moving machine 10 lowers the removed existing deck slab 2 onto the loading platform of the transport vehicle 20. During this lowering process, the existing deck slab 2 is rotated 90° by human power or by using guide ropes, changing the longitudinal direction of the existing deck slab 2 from perpendicular to the bridge axis to the direction of the bridge axis. This allows the lifting and moving machine 10 to transfer the removed existing deck slab 2 to the transport vehicle 20.

[0035] Next, as shown in Figures 3(c) and 4(c), the lifting and moving machine 10 may move further forward from the deck slab handover position. This allows the transport vehicle 20 to back up, move forward from the deck slab receiving position, then change direction and exit. This allows it to return via the in-service lane B.

[0036] Alternatively, the lifting and moving device 10 may remain stationary at the floor slab transfer position shown in Figures 3(b) and 4(b), and the transport vehicle 20 may back out, passing under the lifting and moving device 10 (through the passage space), or the transport vehicle 20 may move forward without passing under the lifting and moving device 10 (through the passage space), and exit.

[0037] The process shown in Figures 3(b) and 4(b) to 3(c) and 4(c) corresponds to the process of removing the existing floor slab, in which the lifting and moving machine 10 lifts the existing floor slab 2 and moves it in the direction of the replacement work, a transport vehicle 20 for removing the existing floor slab is positioned below the lifting point of the lifting and moving machine 10, and then the lifting and moving machine 10 lowers the existing floor slab 2 onto the transport vehicle 20, loads the existing floor slab 2 onto the transport vehicle 20 and exits.

[0038] After the transport vehicle 20 leaves with the existing deck slab 2 loaded, a new transport vehicle 20 arrives via lane B, carrying the new deck slab 2N, as shown in Figures 3(d) and 4(d). The lifting and moving machine 10 is waiting at the deck receiving position (the same as the handover position). Then, the transport vehicle 20 passes under the lifting and moving machine 10 (through the passage space) and enters and positions itself behind the lifting and moving machine 10 (the floor slab transfer position; indicated by the dotted line in the diagram).

[0039] Alternatively, with the lifting and moving machine 10 stationary at the positions shown in Figures 3(c) and 4(c), the transport vehicle 20 carrying the newly constructed floor slab 2N may be brought to the floor slab handover position first, without passing under the lifting and moving machine 10, and then the lifting and moving machine 10 may be moved to the floor slab receiving position.

[0040] Next, as shown in Figures 3(e) and 4(e), the lifting and moving machine 10 lifts the new floor slab 2N from the loading platform of the transport vehicle 20 using its lifting device. This allows the new floor slab 2N to be received from the transport vehicle 20.

[0041] Next, as shown in Figures 3(f) and 4(f), the unloaded transport vehicle 20 backs out, passing under the lifting and moving machine 10 (through the passageway), and waits in front of the lifting and moving machine 10 (when the transport vehicle serves as both a transport vehicle for bringing in new deck slabs and a transport vehicle for removing existing deck slabs). Alternatively, the transport vehicle 20 may exit by moving forward without passing under the lifting and moving machine 10 (through the passageway).

[0042] The steps shown in Figures 3(d) and 4(d) to 3(f) and 4(f) correspond to the process of bringing in the new deck slab, in which the transport vehicle 20 for bringing in the new deck slab is positioned below the lifting point of the lifting and moving machine 10, the lifting and moving machine 10 then lifts the new deck slab 2N from the transport vehicle 20, and then the transport vehicle 20 is moved out.

[0043] Next, as shown in Figures 3(g) and 4(g), the lifting and moving machine 10, while still holding the new floor slab 2N for installation, moves to the opposite side of the direction of the replacement work, and moves to a position on the existing floor slab 2 adjacent to the installation position of the new floor slab, i.e., the floor slab replacement position, where the lifting point (lifting device 15) is above the floor slab replacement position.

[0044] The lifting and moving machine 10 lowers the new deck slab 2N onto the main girder 1 at the installation location of the new deck slab. During this lowering, the new deck slab 2N is rotated 90° by human power or by using a guide rope, changing the longitudinal direction of the new deck slab 2N from the bridge axis direction to the direction perpendicular to the bridge axis. This allows the lifting and moving machine 10 to correctly install the new deck slab 2N.

[0045] The steps shown in Figures 3(g) and 4(g) correspond to the new floor slab installation process, in which the lifting and moving machine 10 moves in the opposite direction to the direction of the replacement work, and the new floor slab 2N is lowered and installed.

[0046] This completes one cycle of deck slab replacement (from the removal of the existing deck slab at one replacement location to the installation of the new deck slab), and we will move on to the next deck slab replacement. Therefore, as shown in Figures 3(h) and 4(h), the lifting and moving machine 10 moves forward by the width of one deck slab, and the next existing deck slab 2 is lifted from above the main girder 1 and removed, similar to Figures 3(a) and 4(a).

[0047] In this way, the lifting and moving machine 10 moves sequentially (one slab at a time) along the rows of existing slabs 2 in the direction of the slab replacement work, and by repeating the steps shown in Figures 3(a) and 4(a) to 3(g) and 4(g), the slab replacement work can be carried out efficiently.

[0048] Furthermore, the transport vehicles 20 that are waiting after the delivery of the new deck slabs in Figures 3(f) and 4(f) will be used to transport out the removed existing deck slabs 2 in the next bridge replacement work (i.e., in Figures 3(h) and 4(h)).

[0049] In other words, the transport vehicle 20 used for bringing in the deck slabs is allowed to leave empty after receiving the deck slabs, then kept on standby and used as the transport vehicle 20 for removing the deck slabs in the next bridge replacement operation. This allows for efficient use of the transport vehicle 20.

[0050] Furthermore, in this embodiment, in the process of removing the existing deck slab, the lifting and moving machine 10 changes the orientation of the existing deck slab 2 while it is lifted before lowering the existing deck slab 2 onto the transport vehicle 20, and in the process of installing the new deck slab, the orientation of the new deck slab 2N is changed while it is lifted before lowering the new deck slab 2N. Since the orientation is changed while the object is suspended in this manner, it can be easily done manually without the need for large-scale equipment such as turntables.

[0051] Furthermore, in this embodiment, the lifting and moving machine 10 is supported on the rows of existing floor slabs 2 at its left and right ground contact points, and has a space 13 between the left and right ground contact points through which a transport vehicle 20 can pass. In the process of removing existing floor slabs or bringing in new floor slabs, when the transport vehicle 20 enters below the lifting point of the lifting and moving machine 10, the transport vehicle 20 moves or enters below the lifting and moving machine 10 by passing through the space 13 between the left and right ground contact points of the lifting and moving machine 10. This makes it easy for the transport vehicle 20 to enter.

[0052] Furthermore, in this embodiment, during the process of removing the existing deck slab or the process of bringing in the new deck slab, when the transport vehicle 20 exits from below the lifting point of the lifting and moving device 10, the lifting and moving device 10 is moved in the direction of the progress of the replacement work from the position where the existing deck slab is handed over to the transport vehicle 20 or the position where the new deck slab is received from the transport vehicle 20, or it is moved in front of the transport vehicle 20, so that the transport vehicle 20 moves to avoid the lifting and moving device 10. This makes it possible to easily and freely exit the transport vehicle 20, especially exit from the replacement work area.

[0053] In the above, as shown in Figure 5(a), the floor slab replacement work is carried out using one lifting and moving machine 10, moving from one end of the floor slab replacement area (row of existing floor slabs) to the other end. However, in order to shorten the construction period, it is also possible to carry out the work using two lifting and moving machines 10 in the following floor slab replacement pattern.

[0054] For example, as shown in Figure 5(b), two lifting and moving machines 10A and 10B are used to sequentially replace the existing deck slabs 2, starting from any one position (intermediate position) in the row and moving in opposite directions (away from each other).

[0055] Alternatively, as shown in Figure 5(c), two lifting and moving machines 10A and 10B are used to sequentially replace the existing deck slabs 2 from any two positions (both ends) in the row toward an intermediate position between them.

[0056] By adopting this method (replacement pattern), the deck replacement work can be carried out more efficiently.

[0057] It should be noted that the illustrated embodiments are merely illustrative examples of the present invention, and the present invention encompasses not only those directly shown by the described embodiments, but also various improvements and modifications made by those skilled in the art within the scope of the claims. The original claims of Japanese Patent Application No. 2020-078864 were as follows: [Claim 1] A method for replacing deck slabs, which involves using a lifting and moving machine capable of lifting and moving deck slabs, to sequentially replace rows of deck slabs in a single direction of travel, The lifting and moving machine moves along the rows of existing deck slabs and has a lifting point at a position that extends from the lifting and moving machine in the direction opposite to the direction of the deck replacement work. The aforementioned replacement work is, (1) The existing deck slab removal process involves lifting and removing the existing deck slab using the lifting and moving machine, (2) The lifting and moving machine lifts the existing floor slab and moves in the direction of the replacement work, a transport vehicle for removing the existing floor slab is positioned below the lifting point of the lifting and moving machine, and thereafter the lifting and moving machine lowers the existing floor slab onto the transport vehicle, and the existing floor slab is loaded onto the transport vehicle and removed, in an existing floor slab removal process, (3) A transport vehicle for transporting the new deck slab is positioned below the lifting point of the lifting machine, the lifting machine then lifts the new deck slab from the transport vehicle, and then the transport vehicle exits in a new deck slab transport process, (4) A new floor slab installation process in which the lifting and moving machine moves in the opposite direction to the direction of the replacement work and lowers and installs the new floor slab, A method for replacing the deck slab, including the following. [Claim 2] The lifting and moving machine is supported on rows of existing floor slabs at its left and right ground contact points, and has a space between the left and right ground contact points through which the transport vehicle can pass. The method for replacing a floor slab according to claim 1, wherein, in the process of removing the existing floor slab or the process of bringing in the new floor slab, when the transport vehicle enters below the lifting point of the lifting and moving machine, the transport vehicle moves through the space between the left and right ground contact points of the lifting and moving machine. [Claim 3] The floor slab replacement method according to claim 1 or 2, wherein in the process of removing the existing floor slab or the process of bringing in the new floor slab, when the transport vehicle exits from below the lifting point of the lifting and moving machine, the lifting and moving machine is moved in the direction of the progress of the replacement work from the position where the existing floor slab is handed over to the transport vehicle or the position where the new floor slab is received from the transport vehicle, so that the transport vehicle moves while avoiding the lifting and moving machine. [Claim 4] A method for replacing a deck slab according to any one of claims 1 to 3, wherein two of the aforementioned lifting and moving machines are used to sequentially perform the replacement work in opposite directions from any one position in the row of existing deck slabs. [Claim 5] A method for replacing a deck slab according to any one of claims 1 to 3, wherein two of the aforementioned lifting and moving machines are used to sequentially perform the replacement work from any two positions in the row of existing deck slabs toward an intermediate position between them. [Explanation of Symbols]

[0058] 1 Main digit 2. Deck slab (existing deck slab) 2N New floor slab 3. Temporary protective fence 10, 10A, 10B lifting machine 11 rails 12 wheels (left and right contact points) 13. Through-space 14 digits 15. Lifting device (lifting point) 20 Transport Vehicles

Claims

1. A method for replacing deck slabs, which involves using a lifting and moving machine capable of lifting and moving deck slabs, to sequentially replace rows of deck slabs in a deck slab replacement area in one direction of travel, The aforementioned lifting and moving machine is movable along rows of existing deck slabs, and has a lifting point located at a position that extends from the lifting and moving machine in the direction opposite to the direction of progress of the deck replacement work. The aforementioned lifting and moving machine is supported on rows of existing floor slabs at its left and right ground contact points, and has a space between the left and right ground contact points through which a transport vehicle can pass. In the aforementioned deck replacement area, the replacement work is carried out as follows: The existing deck slab will be lifted and removed using the aforementioned lifting and moving machine, A transport vehicle for removing existing deck slabs enters below the lifting point of the lifting machine by passing through the space between the left and right ground contact points of the lifting machine, and then the lifting machine lowers the existing deck slabs onto the loading platform of the transport vehicle for removing existing deck slabs, loads the existing deck slabs onto the transport vehicle for removing existing deck slabs, and then the transport vehicle for removing existing deck slabs exits. A transport vehicle for delivering the new deck slab enters below the lifting point of the lifting machine by passing through the space between the left and right ground contact points of the lifting machine, then the lifting machine lifts the new deck slab from the loading platform of the transport vehicle for delivering the new deck slab, and then the transport vehicle for delivering the new deck slab exits. The aforementioned lifting and moving machine is used to lower and install the new floor slab, Includes, The aforementioned replacement work is, By rotating the existing deck slab 90° while it is suspended, the longitudinal direction of the existing deck slab is changed from the direction perpendicular to the bridge axis to the direction of the bridge axis, By rotating the newly constructed deck slab 90° while it is being lifted, the longitudinal direction of the newly constructed deck slab is changed from the direction of the bridge axis to the direction perpendicular to the bridge axis, It further includes, The aforementioned lifting and moving machine moves one floor slab at a time along the row of existing floor slabs, repeating the replacement work. The transport vehicles for removing the existing deck slabs and the transport vehicles for bringing in the new deck slabs are wheeled trailers or trucks that can travel on public roads. Method for replacing the bridge deck.

2. The method for replacing a floor slab according to Claim 1, wherein two lifting and moving machines are used to sequentially replace the floor slabs from any one position in the row of existing floor slabs, each in an opposite direction of travel.

3. The method for replacing a floor slab according to Claim 1, wherein two lifting and moving machines are used to sequentially perform the floor slab replacement work from any two positions in the row of existing floor slabs, each moving in a single direction toward an intermediate position between them.

4. The bridge subject to deck replacement has a plurality of lanes, including a first lane and a second lane, While the deck replacement work is being carried out in the first lane, general vehicles are permitted to pass in the second lane. A temporary protective barrier is installed on the end of the second lane adjacent to the first lane. A method for replacing a deck slab according to any one of claims 1 to 3, wherein the transport vehicle for removing the existing deck slab travels in the second lane for the removal of the existing deck slab, and the transport vehicle for bringing in the new deck slab travels in the second lane for the bringing in of the new deck slab.

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