Change-over method of floor slab

Abstract

To provide an efficient change-over method of a floor slab.SOLUTION: In the change-over method of a floor slab, the following steps (1)-(4) are repeated, while a moving crane 10 sequentially moves in a proceeding direction of change-over work on the raw of an existing floor slab 2. (1) The moving crane 10 has a suspension point at a position extending in the direction opposite to the proceeding direction, and suspends the existing floor slab 2 to remove (a). (2) After an empty load transport vehicle 20 approaches under the suspension point of the moving crane 10, the moving crane 10 hangs down the existing floor slab 2 onto the transport vehicle 20, and retreats the transport vehicle 20 with the existing floor slab 2 loaded thereon (b-c). (3) After the transport vehicle 20 for a new floor slab carrying-in proceeds under the suspension point of the moving crane 10, the moving crane 10 suspends a new floor slab 2N from the transport vehicle 20, and the transport vehicle 20 is retreated in an empty load state (d-f). (4) The moving crane 10 returns to the position of the existing floor slab removal, and the new floor slab 2N is hung down at the position from which the existing floor slab 2 is removed, to be installed (g).SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a method for replacing a deck slab in an existing bridge or the like (removal of the existing deck slab and installation of a new deck slab in its place). [Background technology]

[0002] The deck slabs are made of precast concrete and are laid on top of the girders of the bridge to form the foundation of the road surface. Such decks may require replacement (removal of the existing deck and installation of a new one) due to reasons such as corrosion of the internal steel bars after years of use.

[0003] As a conventional deck replacement method, the method described in Patent Document 1 is known. The deck replacement machine used here comprises a self-propelled gate structure consisting of front and rear gate frames connected in the bridge axis direction, which straddle the deck replacement position with the front and rear gate frames, two sets of rails arranged in parallel along the ceiling of the gate structure, and first and second lifting devices (chain blocks) suspended on each rail and movable.

[0004] The first lifting device is for transporting and setting up the new deck slab, and the second lifting device is for removing and transporting the existing deck slab; these devices can pass each other in opposite directions in the bridge axis direction while lifting the deck slab. In addition, transport vehicles such as trailers are used to bring in the new deck slab and to transport the existing deck slab.

[0005] In the deck replacement method using the above-mentioned deck replacement machine, it is possible to simultaneously transport the new deck from the delivery position (position where it is lifted from the trailer) to the replacement position (position where the new deck is lowered and installed) using the first lifting device, and to transport the existing deck from the replacement position (position where the existing deck is lifted and removed) to the removal position (position where it is lowered onto the trailer) using the second lifting device, making it possible to carry out the delivery and installation of the new deck and the removal and removal of the existing deck in parallel. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2018-100564 A Summary of the Invention [Problem to be solved by the invention]

[0007] In the deck replacement method described in Patent Document 1, the deck replacement machine straddles the deck installation position, and one portal frame rests on the existing deck before removal, while the other portal frame rests on the new deck immediately after installation. This means that a large load will be placed on the newly constructed deck immediately after installation.

[0008] Generally, precast concrete decks are installed with a predetermined gap between them, and the internal rebars (fixing joints) protrude from both decks into the gap. Therefore, the deck is completed by pouring concrete (mortar) into the gap. For this reason, the deck immediately after installation is in an unfinished state, and it may not be desirable to apply the load of the deck replacement machine to it.

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

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

[0011] The deck replacement method according to the present invention is a deck replacement method in which a lifting and moving machine capable of lifting and moving a deck is used to perform replacement work sequentially in one traveling direction for a row of decks, The lifting and moving machine moves on the row of existing decks and has a suspension point at a position protruding from the lifting and moving machine in a direction opposite to the proceeding direction of the replacement work, The replacement work is as follows: (1) an existing deck removal process in which the existing deck is lifted and removed by the lifting and moving machine; (2) an existing deck removal process in which the lifting and moving machine lifts the existing deck and moves in the direction of travel of the replacement work, a transport vehicle for removing the existing deck is positioned below the hanging point of the lifting and moving machine, and then the lifting and moving machine hoists the existing deck onto the transport vehicle, which then loads the existing deck onto the transport vehicle and leaves; (3) a new deck delivery process in which a transport vehicle for delivering a new deck is positioned below the hanging point of the lifting machine, and then the lifting machine lifts the new deck from the transport vehicle, and then the transport vehicle is removed; (4) a new deck installation process in which the lifting and moving machine moves in a direction opposite to the proceeding direction of the replacement work to suspend and install a new deck; Includes. Effect of the Invention

[0012] According to the present invention, the lifting machine only moves on the existing deck, and does not apply a load to the newly constructed deck. In addition, basically, it can be implemented with one lifting and moving machine, and there is only one suspension point, and there is no need to move the suspension point relative to the lifting and moving machine, so it can be implemented with a simple configuration and costs, etc. can be reduced. [Brief description of the drawings]

[0013] [Figure 1] A front view showing an example of construction work for a bridge to be replaced as an embodiment of the present invention. [Diagram 2] Plan and side views of the above example of construction [Diagram 3]Side view showing the procedure for replacing the deck [Figure 4] Plan view showing the procedure for replacing the deck [Diagram 5] An explanatory diagram of deck replacement pattern when using two lifting and moving machines DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] Hereinafter, an embodiment of the present invention will be described in detail. Fig. 1 is a front view showing an example of bridge construction work to be performed on a bridge deck as an embodiment of the present invention, and Fig. 2 is (a) a plan view and (b) a side view of the same construction work.

[0015] In the reconstruction of bridges by replacing decks, the most important issue is to minimize social loss due to traffic restrictions etc. associated with the construction, since the target is a road in service. For this reason, the deck replacement in this embodiment is a so-called "half-section construction".

[0016] That is, if the bridge to be replaced has two rows of decks 2 arranged on top of main girders (bridge girders) 1 made of four parallel H-shaped steel beams, forming two lanes A and B, replacement work for the deck of lane A is carried out on one side at a time, for example, first, while general vehicles are allowed to pass on lane B. In this case, a temporary protective fence 3 is installed in the middle (on the end of the deck of lane B).

[0017] FIG. 2 also shows a basic pattern of deck replacement work using one lifting and moving machine as one embodiment of the present invention. That is, using a lifting and moving machine 10 capable of lifting and moving the deck slabs, the deck slabs are replaced in sequence in one moving direction (the direction of the arrow in FIG. 2). In other words, the replacement work is performed sequentially from one end of the deck slab replacement area (the existing deck slabs) to the other end.

[0018] The direction in which the deck replacement work progresses (the direction of the arrow in Fig. 2) is the basic direction of movement of the lifting machine 10. Therefore, the movement of the lifting machine 10 to the left in Fig. 2 is referred to as forward movement, and conversely, the movement to the right is referred to as backward movement. Also, the left side of the lifting machine 10 in Fig. 2 is the front, and the right side in Fig. 2 is the rear.

[0019] In addition, a transport vehicle 20 such as a trailer or truck is used to transport the existing deck removed by the lifting and moving machine 10 and to transport the new deck to be installed by the lifting and moving machine 10. In this case, during the deck replacement work on lane A, the transport vehicle 20 can travel on lane B, which is in use, to transport the existing deck and to transport the new deck.

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

[0021] The lifting and moving machine 10 has a main body with a gate-shaped structure, and is supported on the existing deck 2 at left and right ground contact portions (12), with a space 13 between the left and right ground contact portions through which a transport vehicle 20 can pass.

[0022] In this embodiment, the left and right ground contact parts are formed by wheels 12. This allows the vehicle to run on the ground contact parts, and the ground contact parts can also serve as running parts.

[0023] Moreover, the wheels 12 in this embodiment are raceways and run on a pair of rails 11 laid via steel sleepers (not shown) on a row of the existing deck 2. By using raceways in this way, the position of the lifting machine 10 and the position of the space 13 for passing through can be stabilized during replacement work. However, this does not prevent the wheels 12 from being tire-type, thereby eliminating the need for rail laying work.

[0024] The lifting machine 10 also moves over the row of existing deck slabs 2 and has a suspension point (suspension device 15) at a position extending from the main body of the lifting machine 10 in the opposite direction (rearward) to the progress of the deck replacement work. Therefore, the lifting mobile machine 10 includes a girder 14 supported on the upper part of the main body and extending rearward, and a hoisting device 15 provided on the tip side of the girder 14.

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

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

[0027] Here, the lifting device 15 is supported by the girder 14, which projects to the rear of the lifting mobile machine 10, so that the above-mentioned lifting and lowering operations can be performed without moving the lifting device 15 back and forth.

[0028] A tire-type trailer or truck is used as the transport vehicle 20. Therefore, it can travel on public roads. However, this does not preclude the use of a dedicated trolley.

[0029] Next, the procedure for replacing the deck in this embodiment will be described with reference to Figs. Fig. 3 is a side view showing the procedure for replacing the deck, and Fig. 4 is a plan view showing the procedure for replacing the deck. Note that (a) to (h) in Fig. 3 correspond to (a) to (h) in Fig. 4. To simplify the explanation, the rails 11 are omitted from Fig. 3 and Fig. 4. Also, the new deck is marked with the symbol "2N" in comparison with the existing deck 2.

[0030] 3 and 4, the deck replacement work progresses from the right end to the left. Therefore, to the right of the current deck replacement position in Fig. 3 and 4, there is a new deck slab 2N that has already been installed on the main girder 1, and to the left 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 machine 10 has moved to a position on the existing deck 2 close to the removal position of the existing deck, i.e., the deck replacement position, where the suspension point (suspension device 15) is above the deck replacement position.

[0032] The lifting mobile machine 10 lifts the existing deck 2 from above the main girder 1 at the removal position of the existing deck, and removes it. At this time, the transport vehicle 20 for carrying out the existing deck is empty and waiting in front of the lifting / moving machine 10 (on the left side in the drawing).

[0033] The steps in FIG. 3(a) and FIG. 4(a) correspond to an existing deck removal step in which the lifting and moving machine 10 lifts and removes the existing deck 2.

[0034] Next, as shown in Figures 3(b) and 4(b), the lifting machine 10 moves forward to the delivery position while hoisting the removed existing deck 2. The transport vehicle 20 passes under the lifting machine 10 (through space) and enters and positions behind the lifting machine 10 (below the suspension point). Then, the existing deck 2 removed by the lifting and moving machine 10 is hoisted down onto the bed of the transport vehicle 20. During this hoisting, the existing deck 2 is rotated 90° by hand or the like, using a surrender rope, and the longitudinal direction of the existing deck 2 is changed from the direction perpendicular to the bridge axis to the direction of the bridge axis. This allows the existing deck 2 removed by the lifting and moving machine 10 to be handed over to the transport vehicle 20.

[0035] Next, as shown in Fig. 3(c) and Fig. 4(c), the lifting and moving machine 10 may move further forward from the deck transfer position. This allows the transport vehicle 20 to move forward from the deck receiving position in reverse, and then to exit by changing direction, etc. This allows the vehicle to return via the lane B in use.

[0036] In addition, the lifting machine 10 may be left waiting at the deck slab transfer position in Figures 3(b) and 4(b), and the transport vehicle 20 may exit by backing up and passing underneath the lifting machine 10 (through the space), or the transport vehicle 20 may exit by moving forward without passing underneath the lifting machine 10 (through the space).

[0037] The processes in Figures 3(b) and 4(b) to 3(c) and 4(c) correspond to the existing deck removal process, in which the lifting machine 10 lifts the existing deck slab 2 and moves in the direction of the replacement work, a transport vehicle 20 for transporting the existing deck slab is positioned below the suspension point of the lifting machine 10, and then the lifting machine 10 hoists the existing deck slab 2 onto the transport vehicle 20, which then loads the existing deck slab 2 onto the transport vehicle 20 and leaves.

[0038] After the transport vehicle 20 leaves carrying the existing deck slab 2, a new transport vehicle 20 comes along via lane B carrying a new deck slab 2N, as shown in FIG. 3(d) and FIG. 4(d). The lifting machine 10 waits at the deck receiving position (same as the delivery position). Then, the transport vehicle 20 passes under the lifting machine 10 (through space) and enters and positions itself behind the lifting machine 10 (deck slab delivery position; dotted line position in the drawing).

[0039] In addition, with the lifting machine 10 waiting at the position shown in Figures 3(c) and 4(c), the transport vehicle 20 carrying the newly constructed deck 2N may first enter the deck transfer position without passing under the lifting machine 10, and then the lifting machine 10 may be moved to the deck receiving position.

[0040] Next, as shown in Figures 3(e) and 4(e), the lifting device of the lifting mobile machine 10 lifts the new deck 2N from the bed of the transport vehicle 20. This makes it possible to receive the new deck 2N from the transport vehicle 20.

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

[0042] The processes in Figures 3(d) and 4(d) to 3(f) and 4(f) correspond to the new deck delivery process, in which the transport vehicle 20 for delivering the new deck is positioned below the suspension point of the lifting machine 10, the lifting machine 10 then hoists the new deck slab 2N from the transport vehicle 20, and then the transport vehicle 20 withdraws.

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

[0044] The lifting machine 10 suspends the new deck 2N onto the main girder 1 at the installation position of the new deck 2N and installs it. During this suspension, the new deck 2N is rotated 90° by hand or by using a sling rope, etc., to change the longitudinal direction of the new deck 2N from the bridge axis direction to a direction perpendicular to the bridge axis. This allows the lifting machine 10 to correctly install the new deck 2N.

[0045] The steps in Figures 3(g) and 4(g) correspond to a new deck installation step in which the lifting machine 10 moves in the opposite direction to the proceeding direction of the replacement work, suspends and installs the new deck slab 2N.

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

[0047] In this way, the lifting machine 10 moves sequentially (one slab at a time) over the row of existing decks 2 in the direction in which the deck replacement work is progressing, while repeating the steps of Figures 3(a) and 4(a) to 3(g) and 4(g), thereby making it possible to efficiently carry out the deck replacement work.

[0048] In addition, the transport vehicle 20 that is waiting after the delivery of the new deck slab in Figures 3(f) and 4(f) is completed will be used to transport the removed existing deck slab 2 in the next replacement work (i.e., in Figures 3(h) and 4(h)).

[0049] That is, the transport vehicle 20 for carrying in the deck is made to leave empty after the deck is delivered, and is then made to wait and is used as the transport vehicle 20 for carrying out the deck in the next replacement work. This allows the transport vehicle 20 to be operated efficiently.

[0050] In addition, in this embodiment, during the existing deck removal process, the orientation of the existing deck 2 is changed while the lifting mobile machine 10 is lifting the existing deck 2 before hoisting it down to the transport vehicle 20, and during the new deck installation process, the orientation of the new deck 2N is changed while the new deck 2N is lifted up before hoisting it down. Since the orientation is changed while the object is being lifted in this manner, it is possible to change the orientation easily by human power or the like without using a large-scale device such as a turntable.

[0051] In this embodiment, the lifting machine 10 is supported on the row of the existing deck 2 by its left and right grounding parts, and has a space 13 between the left and right grounding parts through which the transport vehicle 20 can pass, and when the transport vehicle 20 enters below the suspension point of the lifting machine 10 during the existing deck removal process or the new deck removal process, the transport vehicle 20 passes through the space 13 between the left and right grounding parts of the lifting machine 10 and moves to a position below the lifting machine 10. This allows the transport vehicle 20 to easily enter.

[0052] In this embodiment, when the transport vehicle 20 exits from below the suspension point of the lifting machine 10 during the existing deck removal process or the new deck delivery process, the lifting machine 10 is moved in the proceeding direction of the replacement work from the position for handing over the existing deck to the transport vehicle 20 or the position for receiving the new deck from the transport vehicle 20, or moved forward of the transport vehicle 20, so that the transport vehicle 20 moves while avoiding the lifting machine 10. This allows the transport vehicle 20 to exit, particularly from the replacement work site, easily and freely.

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

[0054] For example, as shown in FIG. 5(b), two lifting and moving machines 10A and 10B are used to perform replacement work in sequence from an arbitrary position (middle position) in the row of existing deck slabs 2 in opposite directions (moving away from each other).

[0055] Alternatively, as shown in FIG. 5(c), two lifting and moving machines 10A, 10B are used to sequentially perform the reassembly work from any two positions (both end positions) in the row of the existing deck slab 2 to the 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 schematic illustrations of the present invention, and it goes without saying that the present invention encompasses various improvements and modifications made by those skilled in the art within the scope of the claims, in addition to those directly shown in the described embodiments. The claims as originally filed for Patent Application No. 2020-078864 were as follows: [Claim 1] A method for replacing a deck slab, comprising the steps of: using a lifting and moving machine capable of lifting and moving the deck slab; sequentially replacing a row of deck slabs in one direction of travel; The lifting and moving machine moves on the row of existing decks and has a suspension point at a position protruding from the lifting and moving machine in a direction opposite to the proceeding direction of the replacement work, The replacement work is as follows: (1) an existing deck removal process in which the existing deck is lifted and removed by the lifting and moving machine; (2) an existing deck removal process in which the lifting and moving machine lifts the existing deck and moves in the direction of travel of the replacement work, a transport vehicle for removing the existing deck is positioned below the hanging point of the lifting and moving machine, and then the lifting and moving machine hoists the existing deck onto the transport vehicle, which then loads the existing deck onto the transport vehicle and leaves; (3) a new deck delivery process in which a transport vehicle for delivering a new deck is positioned below the hanging point of the lifting machine, and then the lifting machine lifts the new deck from the transport vehicle, and then the transport vehicle is removed; (4) a new deck installation process in which the lifting and moving machine moves in a direction opposite to the proceeding direction of the replacement work to suspend and install a new deck; A method for replacing a deck, comprising: [Claim 2] The lifting and moving machine is supported on the row of existing deck slabs at the left and right grounding portions, and has a space between the left and right grounding portions through which the transport vehicle can pass, The deck replacement method according to claim 1, wherein, during the existing deck removal process or the new deck removal process, when the transport vehicle enters below the suspension point of the lifting mobile machine, the transport vehicle moves through the space between the left and right ground contact portions of the lifting mobile machine. [Claim 3] A deck replacement method as described in claim 1 or claim 2, wherein, during the existing deck removal process or the new deck delivery process, when the transport vehicle exits from below the hanging point of the lifting machine, the lifting machine is moved in the direction of progress of the replacement work from a position where the existing deck is delivered to the transport vehicle or a position where the new deck is received from the transport vehicle, and the transport vehicle moves while avoiding the lifting machine. [Claim 4] 4. The deck slab replacement method according to claim 1, wherein two lifting and moving machines are used to perform replacement work in sequence in opposite directions from any one position in a row of existing decks. [Claim 5] The deck replacement method according to any one of claims 1 to 3, wherein two lifting and moving machines are used to sequentially perform replacement work from any two positions in a row of existing decks to a middle position between them. [Explanation of symbols]

[0058] 1 Main digit 2 Deck (existing deck) 2N New floor slab 3 Temporary protective fence 10, 10A, 10B lifting machine 11 Rail 12 Wheels (left and right contact parts) 13 Pass-through space 14 digits 15 Suspension device (suspension point) 20 Transport Vehicles

Claims

1. A method for replacing a deck slab, comprising the steps of: using a lifting and moving machine capable of lifting and moving the deck slab; sequentially replacing a row of deck slabs in one direction of travel; The bridge to be replaced has a plurality of lanes including a first lane and a second lane, While the deck replacement method is being performed in the first lane, general vehicles are allowed to pass in the second lane, a temporary guardrail is installed on an end of the second lane adjacent to the first lane; The lifting and moving machine moves on the row of existing decks and has a suspension point at a position protruding from the lifting and moving machine in a direction opposite to the proceeding direction of the replacement work, The replacement work is as follows: (1) an existing deck removal process in which the existing deck is lifted and removed by the lifting and moving machine; (2) an existing deck removal process in which the lifting and moving machine lifts the existing deck and moves in the direction of travel of the replacement work, a transport vehicle for transporting the existing deck is positioned below the hanging point of the lifting and moving machine, and then the lifting and moving machine hoists the existing deck onto the transport vehicle for transporting the existing deck, and the transport vehicle for transporting the existing deck is loaded with the existing deck and removed; (3) a new deck delivery process in which a transport vehicle for new deck delivery is positioned below the hanging point of the lifting machine, and then the lifting machine lifts the new deck from the transport vehicle for new deck delivery, and then the transport vehicle for new deck delivery exits; (4) a new deck installation process in which the lifting and moving machine moves in a direction opposite to the proceeding direction of the replacement work to suspend and install a new deck; Including, In the existing deck removal process, before the lifting and moving machine suspends the existing deck onto the transport vehicle for removing the existing deck, the existing deck is rotated by 90° to change the longitudinal direction of the existing deck from the direction perpendicular to the bridge axis to the direction of the bridge axis, The lifting and moving machine is supported on the row of existing deck slabs at the left and right grounding portions, and has a space between the left and right grounding portions through which the transport vehicle can pass, A deck replacement method in which, during the existing deck removal process, when the transport vehicle enters below the suspension point of the lifting mobile machine, the transport vehicle moves through the space between the left and right ground contact portions of the lifting mobile machine.

2. A method for replacing a deck slab, comprising the steps of: using a lifting and moving machine capable of lifting and moving the deck slab; sequentially replacing a row of deck slabs in one direction of travel; The bridge to be replaced has a plurality of lanes including a first lane and a second lane, While the deck replacement method is being performed in the first lane, general vehicles are allowed to pass in the second lane, a temporary guardrail is installed on an end of the second lane adjacent to the first lane; The lifting and moving machine moves on the row of existing decks and has a suspension point at a position protruding from the lifting and moving machine in a direction opposite to the proceeding direction of the replacement work, The replacement work is as follows: (1) an existing deck removal process in which the existing deck is lifted and removed by the lifting and moving machine; (2) an existing deck removal process in which the lifting and moving machine lifts the existing deck and moves in the direction of travel of the replacement work, a transport vehicle for transporting the existing deck is positioned below the hanging point of the lifting and moving machine, and then the lifting and moving machine hoists the existing deck onto the transport vehicle for transporting the existing deck, and the transport vehicle for transporting the existing deck is loaded with the existing deck and removed; (3) a new deck delivery process in which a transport vehicle for new deck delivery is positioned below the hanging point of the lifting machine, and then the lifting machine lifts the new deck from the transport vehicle for new deck delivery, and then the transport vehicle for new deck delivery exits; (4) a new deck installation process in which the lifting and moving machine moves in a direction opposite to the proceeding direction of the replacement work to suspend and install a new deck; Including, In the new deck installation process, before the new deck is lowered, the new deck is rotated by 90° to change the longitudinal direction of the new deck from the bridge axis direction to the direction perpendicular to the bridge axis, The lifting and moving machine is supported on the row of existing deck slabs at the left and right grounding portions, and has a space between the left and right grounding portions through which the transport vehicle can pass, A deck replacement method in which, during the new deck delivery process, when the transport vehicle enters below the hanging point of the lifting mobile machine, the transport vehicle moves through the space between the left and right ground contact portions of the lifting mobile machine.

3. A deck replacement method as described in claim 1 or claim 2, wherein the suspension point is supported on the upper part of the lifting machine and is provided at the tip side of a girder that extends from the lifting machine in the opposite direction.

4. A method for replacing a deck slab, comprising the steps of: using a lifting and moving machine capable of lifting and moving a deck slab; sequentially replacing a row of deck slabs in a deck slab replacement area in one moving direction; The lifting and moving machine moves on the row of existing decks and has a suspension point at a position protruding from the lifting and moving machine in a direction opposite to the proceeding direction of the replacement work, In the deck replacement area, the replacement work is performed as follows: (1) an existing deck removal process in which the existing deck is lifted and removed by the lifting and moving machine; (2) an existing deck removal process in which the lifting and moving machine lifts the existing deck and moves in the direction of travel of the replacement work, a transport vehicle for transporting the existing deck is positioned below the hanging point of the lifting and moving machine, and then the lifting and moving machine hoists the existing deck onto the transport vehicle for transporting the existing deck, and the transport vehicle for transporting the existing deck is loaded with the existing deck and removed; (3) a new deck delivery process in which a transport vehicle for new deck delivery is positioned below the hanging point of the lifting machine, and then the lifting machine lifts the new deck from the transport vehicle for new deck delivery, and then the transport vehicle for new deck delivery exits; (4) a new deck installation process in which the lifting and moving machine moves in a direction opposite to the proceeding direction of the replacement work to suspend and install a new deck; Including, In the existing deck removal process, before the lifting and moving machine suspends the existing deck onto the transport vehicle for removing the existing deck, the existing deck is rotated by 90° to change the longitudinal direction of the existing deck from the direction perpendicular to the bridge axis to the direction of the bridge axis, The lifting and moving machine is supported on the row of existing deck slabs at the left and right grounding portions, and has a space between the left and right grounding portions through which the transport vehicle can pass, A deck replacement method in which, during the existing deck removal process, when the transport vehicle enters below the suspension point of the lifting mobile machine, the transport vehicle moves through the space between the left and right ground contact portions of the lifting mobile machine.

5. A deck replacement method as described in Claim 4, wherein the transport vehicle for removing the existing deck is a tire-type trailer or truck capable of traveling on public roads.

6. A method for replacing a deck slab, comprising the steps of: using a lifting and moving machine capable of lifting and moving a deck slab; sequentially replacing a row of deck slabs in a deck slab replacement area in one moving direction; The lifting and moving machine moves on the row of existing decks and has a suspension point at a position protruding from the lifting and moving machine in a direction opposite to the proceeding direction of the replacement work, In the deck replacement area, the replacement work is performed as follows: (1) an existing deck removal process in which the existing deck is lifted and removed by the lifting and moving machine; (2) an existing deck removal process in which the lifting and moving machine lifts the existing deck and moves in the direction of travel of the replacement work, a transport vehicle for transporting the existing deck is positioned below the hanging point of the lifting and moving machine, and then the lifting and moving machine hoists the existing deck onto the transport vehicle for transporting the existing deck, and the transport vehicle for transporting the existing deck is loaded with the existing deck and removed; (3) a new deck delivery process in which a transport vehicle for new deck delivery is positioned below the hanging point of the lifting machine, and then the lifting machine lifts the new deck from the transport vehicle for new deck delivery, and then the transport vehicle for new deck delivery exits; (4) a new deck installation process in which the lifting and moving machine moves in a direction opposite to the proceeding direction of the replacement work to suspend and install a new deck; Including, In the new deck installation process, before the new deck is lowered, the new deck is rotated by 90° to change the longitudinal direction of the new deck from the bridge axis direction to the direction perpendicular to the bridge axis, The lifting and moving machine is supported on the row of existing deck slabs at the left and right grounding portions, and has a space between the left and right grounding portions through which the transport vehicle can pass, A deck replacement method in which, during the new deck delivery process, when the transport vehicle enters below the hanging point of the lifting mobile machine, the transport vehicle moves through the space between the left and right ground contact portions of the lifting mobile machine.

7. A deck replacement method as described in Claim 6, wherein the transport vehicle for transporting the newly installed deck is a tire-type trailer or truck capable of traveling on public roads.

8. A deck replacement method described in any one of claims 4 to 7, wherein the suspension point is supported on the upper part of the lifting machine and is provided at the tip side of a girder that extends from the lifting machine in the opposite direction.

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