Deck replacement construction system and deck replacement construction method

Abstract

To provide a technique applicable to both of a construction form for performing both removal and new construction of a floor slab in one work section and a construction form for separating the work section for performing removal and new construction of the floor slab, and capable of lengthening a span of the work section.SOLUTION: A floor-slab replacement construction system includes two floor-slab replacement construction machines each having a traveling gantry capable of independently self-standing and self-traveling and a main installing girder provided with a construction machine side trolley rail on which a lifting device travels, and an extension installing girder having an extension trolley rail which is attachable to and detachable from the main installing girder and is continuous with the construction machine side trolley rail in a state of being connected to the main installing girder. The form can be changed to a connection use form in which the extension erection girder is erected between the respective main erection girders of the two floor-slab replacement construction machines and a single use form in which the extension erection girder is connected to the respective main erection girders without connecting the two floor-slab replacement construction machines.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a deck slab replacement construction system and a deck slab replacement construction method. [Background technology]

[0002] A bridge is composed of multiple piers, bridge girders that span the axial direction of the bridge, and deck slabs that are placed on top of the multiple girders. Bridge decks may be replaced (removal of the existing deck and installation of a new one) due to reasons such as deterioration caused by long-term use. This type of deck replacement work is also called renovation work.

[0003] In the past, deck replacement work was carried out using a crane truck, but depending on the site conditions, it can be difficult to lift the deck using a crane truck, which requires rotating the crane. In particular, when deck replacement work is carried out on a road bridge that is in service, if a large number of lanes are restricted during work, this can cause traffic congestion, so it is necessary to minimize the scope of traffic restrictions. Therefore, in recent years, dedicated deck replacement machines have been developed that enable "width-wise division replacement," in which the deck is divided widthwise and work is carried out (see, for example, Patent Document 1, etc.).

[0004] This type of deck replacement construction machine is equipped with a self-propelled gate-type structure consisting of gate-type frames connected at the front and rear in the bridge axis direction, and a lifting device that is mounted on the underside of the ceiling of the gate-type structure and is capable of moving in the front-to-rear direction and rotating. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 6677628 [Patent Document 2] Patent No. 7193172 [Patent Document 3] Japanese Patent Application Publication No. 2023-154661 Summary of the Invention [Problem to be solved by the invention]

[0006] When using the above-mentioned deck replacement construction machine to carry out deck replacement (renewal) work, there are two possible construction configurations: one in which one deck replacement construction machine is used to perform both the removal of the existing deck and the installation of the new deck in one work section, and two deck replacement machines are placed apart in the bridge axis direction, with the deck replacement construction machine located at the front of the construction direction removing the existing deck and the deck replacement construction machine located at the rear of the construction direction installing (setting up) the new deck.

[0007] However, conventional deck replacement construction machines were unable to ensure a sufficient construction span along the bridge axis, and there was room for improvement in terms of workability in all of the construction methods mentioned above.

[0008] The present invention was made in consideration of the above-mentioned problems, and its purpose is to provide a technology that can be applied to both construction methods in which both deck removal and new installation are carried out in one work area, and construction methods in which the work areas for deck removal and new installation are separated, and that can make the work area longer in span. [Means for solving the problem]

[0009] The technology disclosed herein is a deck replacement construction system applied to deck replacement work on an existing bridge, A traveling platform that can stand on its own and move in the bridge axis direction, and a construction machine side trolley rail that is a main erection girder supported by the traveling platform and extends in the bridge axis direction, on which the lifting device travels. a main erection girder provided along the bridge axis direction; and two deck slab replacement construction machines each having a An extension erection girder that is detachable from the main erection girder and has an extension trolley rail that is continuous with the construction machine side trolley rail when connected to the main erection girder; Equipped with A connected use form in which the existing deck slab is removed and a new deck slab is installed between the two deck slab replacement construction machines connected by erecting the extension erection girder between the main erection girders of each of the two deck slab replacement construction machines; The extension erection girder is connected to the main erection girder so that each of the main erection girders can be extended without connecting the two deck slab replacement construction machines, and one of the two deck slab replacement construction machines is used as a machine to remove the existing deck slab and the other is used as a machine to install a new deck slab.The configuration can be changed to a standalone configuration.

[0010] The deck replacement construction machine is provided with a traveling saddle having a running wheel at the lower end of each of four telescopic leg units, In the single-use form, an extension saddle having a running wheel may be connected to the running saddle of the deck replacement construction machine so that the running saddle located on the specified erection girder extension direction side where the extension erection girder is connected to the main erection girder is extended in the erection girder extension direction.

[0011] In the single use form, an auxiliary leg unit may be provided at the tip end of the extension erection girder connected to the main erection girder, and the tip end of the extension erection girder may be supported by the auxiliary leg unit.

[0012] The auxiliary leg unit may be capable of switching its position between a stored position in which it is attached to the extension erection girder and an deployed position in which it is suspended downward from the extension erection girder.

[0013] Furthermore, the technology according to the present disclosure can be specified as a deck replacement construction method using the above-mentioned deck replacement construction system. That is, in the deck replacement construction method according to the present disclosure, in the connected use form, the existing deck slab is removed and a new deck slab is installed between the two deck slab replacement construction machines connected by erecting the extension erection girder between the main erection girders of each of the two deck slab replacement construction machines, and in the independent use form, the extension erection girder is connected to the main erection girder so that each main erection girder is extended without connecting the two deck slab replacement construction machines, and one of the two deck slab replacement construction machines is used as a removal machine for the existing deck slab and the other is used as an installation machine for the new deck slab. [Effects of the Invention]

[0014] According to the present invention, it is possible to provide a technology that can be applied to both a construction method in which both deck removal and new installation are carried out in one work area, and a construction method in which the work areas for deck removal and new installation are separated, and that can extend the span of the work area. [Brief explanation of the drawings]

[0015] [Figure 1] Figure 1 is a schematic diagram of the deck replacement construction system. [Figure 2] FIG. 2 is a diagram illustrating a connected use form in the deck slab replacement construction system. [Figure 3] FIG. 3 is a diagram illustrating a single use form of the deck slab replacement construction system. [Figure 4] FIG. 4 is a side view of the deck slab replacement construction machine. [Figure 5] FIG. 5 is a front view of the deck slab replacement construction machine. [Figure 6] FIG. 6 is a top view of the deck slab replacement construction machine. [Figure 7] FIG. 7 is a side view of the auxiliary leg unit. [Figure 8] FIG. 8 is a front view of the auxiliary leg unit. [Figure 9] FIG. 9 is a diagram illustrating the assembly procedure when the deck slab replacement construction system is used in a connected use form. [Figure 10] FIG. 10 is a diagram illustrating the assembly procedure when the deck slab replacement construction system is used in a connected use form. [Figure 11] FIG. 11 is a diagram illustrating the assembly procedure when the deck slab replacement construction system is used as a stand-alone system. [Figure 12] FIG. 12 is a diagram illustrating the assembly procedure when the deck slab replacement construction system is used as a stand-alone system. DETAILED DESCRIPTION OF THE INVENTION

[0016] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0017] <Embodiment 1> 1 is a schematic diagram of a deck replacement construction system 1 according to embodiment 1. The deck replacement construction system 1 is a system for replacing the deck of an existing bridge (removing the existing deck and installing a new deck), and is configured to include two deck replacement construction machines 100A, 100B and a pair of extension erection girders 600, 600 that can be attached to and detached from these deck replacement construction machines 100A, 100B.

[0018] Figure 2 is a diagram explaining the connected use form of the deck slab replacement construction system 1. Figure 3 is a diagram explaining the independent use form of the deck slab replacement construction system 1. The deck slab replacement construction system 1 can be changed to either the connected use form shown in Figure 2 or the independent use form shown in Figure 3. Figures 2 and 3 are side views of the deck slab replacement construction system 1 as viewed from the direction perpendicular to the bridge axis of the bridge. The X direction in the diagram indicates the bridge axis direction in which the bridge extends. The Y direction indicates the direction perpendicular to the bridge axis (bridge width direction) that is perpendicular to the bridge axis direction. The Z direction indicates the up and down direction.

[0019] The linked usage form shown in Figure 2 is a usage form in which two deck slab replacement construction machines 100A, 100B are linked together and the existing deck slab is removed and a new deck slab is installed (erected) between the two deck slab replacement construction machines 100A, 100B. In the deck slab replacement construction system 1 of the linked usage form, an extension erection girder 600 is installed between the two deck slab replacement construction machines 100A, 100B, and the two deck slab replacement construction machines 100A, 100B are linked together via the extension erection girder 600.

[0020] The standalone use configuration shown in FIG. 3 is a configuration in which the two deck slab replacement construction machines 100A, 100B are not connected, and one of the two deck slab replacement construction machines 100A, 100B is used as a machine to remove the existing deck slab, while the other is used as a machine to install a new deck slab (construction machine). In the standalone use configuration of the deck slab replacement construction system 1, an extension erection girder 600 is installed on each of the deck slab replacement construction machines 100A, 100B, and the tip side of each extension erection girder 600 is supported by an auxiliary leg unit 500. The extension erection girder 600 used in the connected use configuration shown in FIG. 2 and the extension erection girder 600 used in the standalone use configuration shown in FIG. 3 may have the same length or different lengths. Various lengths of the extension erection girder 600 can be selectively used depending on various conditions, such as the use configuration and construction conditions of the deck slab replacement construction machines 100A, 100B.

[0021] Hereinafter, of the two deck slab replacement construction machines 100A, 100B, 100A may be referred to as the "first deck slab replacement construction machine" and 100B may be referred to as the "second deck slab replacement construction machine." In this embodiment, the two deck slab replacement construction machines 100A, 100B have the same structure, and when there is no need to distinguish between them, they may be referred to as the "deck slab replacement construction machine 100."

[0022] Fig. 4 is a side view of the deck slab replacement construction machine 100. Fig. 5 is a front view of the deck slab replacement construction machine 100. Fig. 6 is a top view of the deck slab replacement construction machine 100. The side view shown in Fig. 4 is a side view of the deck slab replacement construction machine 100. Fig. 5 is a view of the replacement construction machine 100 viewed from a direction perpendicular to the bridge axis. The front view shown in Fig. 5 is a view of the deck slab replacement construction machine 100 viewed from the bridge axis direction. The top view shown in Fig. 6 is a view of the deck slab replacement construction machine 100 viewed from above.

[0023] The deck replacement construction machine 100 has a traveling platform 200 that has a traveling device and is capable of standing on its own and traveling in the bridge axis direction, and a main erection girder 300 that is supported by the traveling platform 200 and extends in the bridge axis direction. The traveling platform 200 is composed of portal frames 210, 210 at the front and rear in the bridge axis direction, and a pair of left and right main frames 220, 220 that connect the upper parts of these portal frames 210, 210.

[0024] Each of the front and rear portal frames 210, 210 is composed of left and right leg units 230, 230 and a cross-frame unit 240 that connects these left and right leg units 230, 230 at the top. The cross-frame unit 240 is installed horizontally, and the left and right leg units 230, 230 are respectively suspended downward from the ends of the cross-frame unit 240 in the direction perpendicular to the bridge axis. The leg units 230, 230 are equipped with hydraulic cylinders, allowing them to freely extend and retract in the leg axis direction (up and down direction). As described above, the deck slab replacement construction machine 100 is equipped with four leg units 230 that are freely extendable and retractable in the up and down direction (Z direction).

[0025] A traveling saddle 231 is attached as a traveling device to the lower end of each leg unit 230 of the deck slab replacement construction machine 100. Each traveling saddle 231 is elongated in the bridge axis direction, and multiple traveling wheels 232 are arranged in a line along the bridge axis direction. In addition, the traveling saddle 231 is pin-connected to the lower end of each leg unit 230, 230 so as to be rotatable via a rotation shaft 233 extending in a direction perpendicular to the bridge axis.

[0026] In addition, running rails Ra1 are laid on the road surface of the existing deck slab to allow the deck slab replacement construction machine 100 (running platform 200) to travel on. By installing each running saddle 231 (running wheels 232) on the running rails Ra1, the deck slab replacement construction machine 100 (running platform 200) can travel on the running rails Ra1. However, the running platform 200 may also be a self-propelled platform of a trackless type (a system that does not require rails, etc.).

[0027] Furthermore, the cross-bridge frame unit 240 in each of the front and rear portal frames 210 has a base portion 241 and a pair of telescopic frame portions 242 that are extendable and retractable from the base portion 241 in a direction perpendicular to the bridge axis (width direction of the bridge), and the upper ends of the left and right leg units 230 are connected to each telescopic frame portion 242. The pair of telescopic frame portions 242 are extendable and retractable in the direction perpendicular to the bridge axis (width direction of the bridge) by a hydraulic cylinder or the like. By extending and retracting the pair of telescopic frame portions 242 with respect to the base portion 241 of the cross-bridge frame unit 240, the length by which the leg units 230 overhang from the base portion 241 in the direction perpendicular to the bridge axis (width direction of the bridge) (overhang length) can be changed.

[0028] Furthermore, the deck slab replacement construction machine 100 is equipped with a main erection girder 300 that is supported by the traveling platform 200 and extends in the bridge axis direction. The main erection girder 300 is a steel girder member with a box-shaped cross section and is also called a girder. A construction machine-side trolley rail 310 for suspending a lifting device 400 (described later) is installed on the main erection girder 300 along the bridge axis direction. The extension erection girder 600 is detachably attached to the main erection girder 300 of the deck slab replacement construction machine 100. The end of the main erection girder 300 in the longitudinal direction to which the extension erection girder 600 is connected is called the "girder connecting end 300A." The main erection girder 300 is supported slidably along the bridge axis direction by a pair of support frames 243 fixed to the base portions 241 of the cross-frame units 240 of the front and rear portal frames 210, 210.

[0029] Specifically, slide sections 320 extending along the bridge axis direction are provided on the upper sides of the left and right side surfaces of the main erection girder 300, and these left and right slide sections 320 are supported by slide plates 244 provided on a pair of support frames 243 of each cross-frame unit 240. The slide plate 244 is a plate with a U-shaped cross section and holds the slide section 320 of the main erection girder 300 slidably in the bridge axis direction. The main erection girder 300 is also provided with a slide device 330 that slides the slide section 320 along the slide plate 244. The main erection girder 300 supported by the traveling platform 200 can slide along the bridge axis direction within a predetermined stroke range by operating the slide device 330. The construction machine-side trolley rails 310 are provided on the lower sides of the left and right side surfaces of the main erection girder 300 and extend along the longitudinal direction (bridge axis direction) of the main erection girder 300.

[0030] A lifting device 400 for lifting the deck slab is suspended from a pair of left and right construction machine side trolley rails 310 on the main erection girder 300. The lifting device 400 includes a pair of trolleys 410 that are respectively installed on the pair of left and right construction machine side trolley rails 310 and that can run along the construction machine side trolley rails 310, a swivel device 420 suspended from the pair of trolleys 410, a swivel frame 430 rotatably suspended by the swivel device 420, and a plurality of chain blocks 440 installed on the swivel frame 430.

[0031] The pair of trolleys 410 in the main erection girder 300 have travel motors 411, which, when activated, allow the trolleys 410 to travel along the construction machine-side trolley rail 310. The swivel device 420 has a swivel motor 421 and can rotate the swivel frame 430 horizontally around a vertical axis (Z direction) as the rotation axis. The swivel frame 430 has a pair of chain block rails 431 extending parallel to each other, and two chain blocks 440 are provided on each chain block rail 431. Furthermore, each chain block 440 has a travel motor 441 for traveling along the chain block rail 431 within a predetermined stroke range, a hoisting motor 442 for winding up the wire rope, and the like. Each chain block 440 also has a load hoisting hook 443 at the tip of the wire rope for hoisting the deck slab. The lifting device 400 configured as described above can freely raise and lower the deck (existing deck, new deck, etc.) lifted by the chain block 440, rotate it horizontally, and move it in the bridge axis direction.

[0032] When the deck slab replacement construction machine 100 in this embodiment is used in the connected use form of FIG. 2 or the independent use form of FIG. 3, an extension erection girder 600 is attached to the girder connecting end 300A of the main erection girder 300, and the area below the main erection girder 300 and the extension erection girder 600 becomes the work area WA (see FIGS. 2, 3, etc.). Hereinafter, the side of the deck slab replacement construction machine 100 facing the work area WA will be referred to as the "front" and the opposite side will be referred to as the "rear". In addition, in both the connected use form and the independent use form, the deck slab replacement construction system 1 according to this embodiment extends the main erection girder 300 by connecting the extension erection girder 600 to the main erection girder 300 of the deck slab replacement construction machine 100. Hereinafter, the direction in which the extension erection girder 600 is connected to the main erection girder 300 of the deck slab replacement construction machine 100, in other words, the direction in which the main erection girder 300 is extended, will be referred to as the "erection girder extension direction." In this embodiment, the front of the deck slab replacement construction machine 100 faces the "erection girder extension direction."

[0033] Regarding the traveling saddles 231 provided on each leg unit 230 of the deck slab replacement construction machine 100 (traveling platform 200), reference numeral 231A can be regarded as the front traveling saddle (the traveling saddle located on the extension side of the erection girder), and 231B as the rear traveling saddle. For example, in the deck slab replacement construction machine 100, the rear traveling saddles 231B arranged on the left and right sides are provided with drive motors, and the traveling wheels 232 provided on these are driven by the motors as driving wheels. The running wheels 232 provided on the front running saddle 231A may be configured as driven wheels.

[0034] In addition, the front traveling saddle 231A and the rear traveling saddle 231B located on the left side of the deck slab replacement construction machine 100 (traveling platform 200), and the front traveling saddle 231A and the rear traveling saddle 231B located on the right side, are each connected by a saddle connecting frame 234. This allows the rear traveling saddle 231B, which has driving wheels, to smoothly pull the front traveling saddle 231A, which has driven wheels. Each saddle connecting frame 234, located on the left and right sides of the deck slab replacement construction machine 100 (traveling platform 200), is rotatably connected to the traveling saddle 231 via a connecting pin 235 extending perpendicular to the bridge axis. This allows the deck slab replacement construction machine 100 (traveling platform 200) to travel smoothly, following the gradient of the road surface, even when there is a gradient on the road surface.

[0035] 4 denotes an extension saddle that can be connected to the front traveling saddle 231A so as to extend the front traveling saddle 231A in the bridge axis direction, and has traveling wheels 232. In other words, the extension saddle 237 is connected to the front traveling saddle 231A so that the front traveling saddle 231A located on the side of the above-mentioned erection girder extension direction of the traveling saddle 231 is extended in the erection girder extension direction. The extension saddle 237 is detachable from the front traveling saddle 231A, and by using the extension saddle 237 as an optional member, it is possible to suitably prevent the deck slab replacement construction machine 100 from tilting forward or tipping over during lifting work using the lifting device 400.

[0036] Furthermore, in the deck slab replacement construction machine 100 (traveling platform 200) according to this embodiment, as described above, the lower end of each leg unit 230 and each traveling saddle 231 are pin-connected. This allows each of the four leg units 230 to extend and retract independently. For example, even in places where the road surface is inclined, each leg unit 230 can be extended and retracted while the main erection girder 300 is maintained in a horizontal position.

[0037] Furthermore, the front and rear leg units 230 located on the left side of the deck slab replacement construction machine 100 (traveling platform 200), and the front and rear leg units 230 located on the right side, are connected by a leg connecting frame 250 (see Figure 4). The leg connecting frame 250 connects the lower sides of the leg units 230 to each other. Furthermore, the leg connecting frame 250 is pin-connected to the leg units 230 via connecting pins 251 extending in a direction perpendicular to the bridge axis. In this way, by connecting the front and rear leg units 230 to each other by the leg connecting frame 250, it is possible to prevent the front and rear leg units 230 from spreading their legs apart.

[0038] Next, returning to FIG. 2, the details of the coupled use form of the deck slab replacement construction system 1 will be described. The deck slab replacement construction machine 100 according to this embodiment can detachably connect an extension erection girder 600 to the girder connecting end 300A of the main erection girder 300. When connecting the extension erection girder 600 to the main erection girder 300 of the deck slab replacement construction machine 100, they are rigidly joined using splice plates 610 and high-strength bolts 620, etc. As shown in FIG. 2, in the coupled use form, the extension erection girder 600 is erected between the main erection girders 300 of the two deck slab replacement construction machines 100A and 100B, thereby forming a single continuous erection girder GD. Therefore, a large working area WA sandwiched between the two deck slab replacement construction machines 100A and 100B can be secured, enabling efficient construction.

[0039] The extension erection girder 600 is configured as a steel girder member having a box-shaped cross section, similar to the main erection girder 300. In addition, trolley rails (hereinafter referred to as "extension trolley rails") 630 similar to the construction machine side trolley rails 310 are provided on the lower left and right sides of the extension erection girder 600. The extension trolley rails 630 are provided on the lower left and right sides of the extension erection girder 600. The trolley rails 310 extend along the bridge axis (the bridge axis direction), allowing the trolley 410 of the lifting device 400 to travel. As shown in Figure 2, when the extension erection girder 600 is erected between the main erection girders 300 of the two deck slab replacement construction machines 100A, 100B, that is, when the two deck slab replacement construction machines 100A, 100B are connected, the pair of construction machine side trolley rails 310 and the extension trolley rail 630 arranged between them form a single long trolley rail TR. The lifting device 400, which is suspended from the trolley rail TR via the trolley 410, can travel along the trolley rail TR extending in the bridge axis direction.

[0040] As an example, when used in a connected configuration, the deck slab replacement construction system 1 has a single lifting device 400 suspended from the trolley rail TR of the erection girder GD as shown in Figure 2. Then, by using the lifting device 400 to lift the deck slab FS, the existing deck slab can be removed and a new deck slab can be installed.

[0041] Next, with reference to Figure 3, details of the independent use form of the deck slab replacement construction system 1 will be described. In the independent use form of the deck slab replacement construction system 1, as shown in Figure 3, the deck slab replacement construction machines 100A, 100B are not interconnected but are arranged apart in the bridge axis direction, and each is used independently. In this independent use form, an extension erection girder 600 is connected to each main erection girder 300 so that the main erection girder 300 of each deck slab replacement construction machine 100A, 100B is extended. For example, the deck slab replacement construction machine 100A that precedes (is arranged in front) in the construction direction is used as a removal machine that removes the existing deck slab, and the deck slab replacement construction machine 100B that follows (is arranged in the rear) in the construction direction is used as an installation machine (erection machine) that installs a new deck slab. As shown in FIG. 3, when the deck slab replacement construction system 1 is used in a standalone mode, a lifting device 400 is attached to each of the deck slab replacement construction machines 100A, 100B.

[0042] In addition, when the extension erection girder 600 is connected to the main erection girder 300 of each deck slab replacement construction machine 100A, 100B, the construction machine side trolley rail 310 of the main erection girder 300 and the extension trolley rail 630 of the extension erection girder 600 are continuous to form a single long trolley rail. The lifting device 400 can travel along the construction machine side trolley rail 310 and the extension trolley rail 630, which are continuous as a single trolley rail.

[0043] As shown in FIG. 3, in the standalone use of the deck slab replacement construction system 1, an optional extension saddle 237 is attached to the front traveling saddle 231A of each of the deck slab replacement construction machines 100A, 100B.

[0044] 3, an optional auxiliary leg unit 500 is provided on the tip 600A side of the extension erection girder 600 connected to the main erection girder 300. In the standalone use mode, the auxiliary leg unit 500 supports the load on the tip 600A side of the extension erection girder 600 connected to the main erection girder 300.

[0045] Fig. 7 is a side view of the auxiliary leg unit 500. Fig. 8 is a front view of the auxiliary leg unit 500. In this embodiment, the auxiliary leg unit 500 can switch its position between a stored position in which it is placed along the underside of the extension erection girder 600 as shown by P1 in Fig. 7, and a deployed position in which it is suspended downward from the extension erection girder 600 in the vertical direction (Z direction) as shown by P2.

[0046] The auxiliary leg unit 500 includes a cross beam 510 joined to the underside of the extension erection girder 600 near the tip 600A, a pair of pivotal connectors 520 joined to the ends of the cross beam 510, a pair of auxiliary legs 530 connected to each pivotal connector 520, a connecting beam 540 connecting the pair of auxiliary legs 530 at their intermediate portions, and a jack device 550 joined to the lower part of each auxiliary leg 530. It is equipped with base beams 560 and the like installed between each jack device 550. The cross beams 510, connecting beams 540, base beams 560, and the like are steel beams extending in a direction perpendicular to the bridge axis (bridge width direction), and may be, for example, H-shaped steel beams.

[0047] The auxiliary leg 530 includes a first auxiliary leg 531 and a second auxiliary leg 532 that can be inserted into or removed from the first auxiliary leg 531. The auxiliary leg 530 can be extended or retracted by adjusting the insertion length of the second auxiliary leg 532 relative to the first auxiliary leg 531. Each auxiliary leg 530 has a fixing pin 533 that fixes the second auxiliary leg 532 to the first auxiliary leg 531 and releases the fixation, allowing the second auxiliary leg 532 to be inserted or removed. The first auxiliary leg 531 and the second auxiliary leg 532 are steel tubular members, and each has an insertion hole through which the fixing pin 533 can be inserted or removed. The insertion holes for the second auxiliary leg 532 are arranged in multiple stages along the axial direction of the second auxiliary leg 532, and the length of the auxiliary leg 530 can be changed by selecting the insertion hole into which the fixing pin 533 is inserted. The jack device 550 is, for example, a manual jack.

[0048] When the deck slab replacement construction system 1 is used in a standalone configuration, the auxiliary leg unit 500 is deployed and lifting work is performed by the lifting device 400. By supporting the tip 600A side of the extension erection girder 600 with the auxiliary leg unit 500, the deck slab FS can be stably lifted. Note that RT shown in Figure 7 is a sleeper, which is arranged as necessary when a gap is formed between the underside of the base beam 560 in the auxiliary leg unit 500 and the road surface (or bridge girder).

[0049] The pivotal connector 520 has a pivot pin 521 that extends in a direction perpendicular to the bridge axis (bridge width direction). By pivoting the auxiliary leg 530 around the pivot pin 521, the posture of the auxiliary leg unit 500 can be changed between the stored posture P1 and the deployed posture P2 described above. As shown in FIG. 7 , a fastener 650 for attaching a chain block (not shown) is provided on the underside of the extension erection girder 600. Meanwhile, a fastener 534 for mooring the hanging hook of the chain block suspended by the fastener 650 is provided on the first auxiliary leg 531 of the auxiliary leg 530. The posture of the auxiliary leg unit 500 can be switched or the auxiliary leg unit 500 can be fixed in the stored posture P1 by adjusting the length of the chain on the chain block. When moving the deck slab replacement construction machine 100 with the auxiliary leg unit 500 deployed, the base beam 560 of the auxiliary leg unit 500 can be raised by operating the jack device 550. In other words, the auxiliary leg unit 500 can be extended or contracted in length by the operation of the jack device 550, which makes it easy to change the setup of the deck slab replacement construction machine 100. The jack device 550 may be an electric or hydraulic jack device.

[0050] Next, a description will be given of the assembly procedure when using the deck slab replacement construction system 1 in a connected usage form. Figures 9 and 10 are diagrams for explaining the assembly procedure when using the deck slab replacement construction system 1 in a connected usage form.

[0051] First, as shown in (A), with the first deck slab replacement construction machine 100A placed in a predetermined position, the extension erection girder 600 is transported by trailer below the traveling platform 200 of the first deck slab replacement construction machine 100A. Note that the first deck slab replacement construction machine 100A does not have a lifting device 400 attached to the main erection girder 300. Next, as shown in (B), with the hoisting chain 700 engaged with the hoisting fittings 340 attached to the underside of the main erection girder 300 of the first deck slab replacement construction machine 100A and the hoisting fittings 640 attached to the upper surface of the extension erection girder 600, the four leg units 230 of the first deck slab replacement construction machine 100A are synchronously extended to lift the extension erection girder 600. Then, after the trailer carrying the extension erection girder 600 is withdrawn, the four leg units 230 of the first deck slab replacement construction machine 100A are shortened in synchronization, and the extension erection girder 600 is placed on the platform 710 installed on the road surface as shown in (C). 00 is unloaded. Alternatively, the platform 710 may be installed in advance at the position where the extension erection girder 600 is to be unloaded, and the first deck slab replacement construction machine 100A may be moved to that position and then the extension erection girder 600 may be unloaded onto the platform 710.

[0052] Next, as shown in (D), a second deck slab replacement construction machine 100B with a lifting device 400 attached to the main erection girder 300 is placed on the opposite side of the first deck slab replacement construction machine 100A in the bridge axis direction, sandwiching the extension erection girder 600. That is, the first deck slab replacement construction machine 100A and the second deck slab replacement construction machine 100B are placed so as to sandwich both ends of the extension erection girder 600 in the bridge axis direction. Then, as shown in (E), the leg units 230 of the first deck slab replacement construction machine 100A and the second deck slab replacement construction machine 100B are appropriately shortened to match the height of each main erection girder 300 and extension erection girder 600. Then, one end of the extension erection girder 600 is rigidly joined to the tip of the main erection girder 300 in the first deck slab replacement construction machine 100A, and the other end of the extension erection girder 600 is rigidly joined to the tip of the main erection girder 300 in the second deck slab replacement construction machine 100B. The rigid joining of each main erection girder 300 and the extension erection girder 600 is performed using, for example, splice plates and high-strength bolts. As a result, in the deck slab replacement construction system 1, a connected usage form is completed in which the first deck slab replacement construction machine 100A and the second deck slab replacement construction machine 100B are connected via the main erection girder 300. When working using the deck replacement construction system 1 in a connected configuration, the leg units 230 of the first deck replacement construction machine 100A and the second deck replacement construction machine 100B are extended in unison as shown in (F), and then the lifting device 400 is used to remove the existing deck and install the new deck.

[0053] Next, we will explain the assembly procedure when using the deck slab replacement construction system 1 in a standalone use form. Figures 11 and 12 are diagrams explaining the assembly procedure when using the deck slab replacement construction system 1 in a standalone use form.

[0054] First, as shown in (A), with the first deck slab replacement construction machine 100A placed in a predetermined position, the base beam 560 of the above-mentioned auxiliary leg unit 500 is carried in by truck or the like below the traveling platform 200 of the first deck slab replacement construction machine 100A. The first deck slab replacement construction machine 100A has a lifting device 400 attached to the main erection girder 300. In addition, an extension saddle 237 is attached to the front traveling saddle 231A of the first deck slab replacement construction machine 100A. Then, using the lifting device 400 of the first deck slab replacement construction machine 100A, the base beam 560 is placed on a sleeper RT placed on the road surface or bridge girder.

[0055] Next, the extension erection girder 600 is carried in by trailer below the traveling platform 200 of the first deck slab replacement construction machine 100A. The extension erection girder 600 has the auxiliary leg unit 500 attached in a stored position with the base beam 560 removed. Then, similar to the procedure shown in Figures 9(B) and (C), the extension erection girder 600 is lifted by the main erection girder 300 of the first deck slab replacement construction machine 100A, the trailer is withdrawn, and the extension erection girder 600 is unloaded onto the platform 710 (Figure 10(B)).

[0056] Then, the first deck replacement construction machine 100A is moved and the four leg units 230 of the first deck replacement construction machine 100A are shortened in synchronization to adjust the height of the main erection girder 300 to the height of the extension erection girder 600, and then the extension erection girder 600 is rigidly joined to the main erection girder 300 using splice plates and high-strength bolts (Figure 10 (C)).

[0057] Next, as shown in (D), each leg unit 230 in the first deck replacement construction machine 100A is extended in unison, and then the auxiliary leg unit 500 attached to the extension erection girder 600 (at this point, the base beam 560 is not attached) is changed from the storage position P1 to the deployment position P2.

[0058] Then, as shown in (E), the first deck slab replacement construction machine 100A is moved so that the unfolded auxiliary leg unit 500 is positioned above the base beam 560, and the height is adjusted by operating the jack device 550 of the auxiliary leg unit 500 so that the underside of the jack device 550 abuts the upper surface of the base beam 560. Then, the jack device 550 of the auxiliary leg unit 500 is joined to the base beam 560 with bolts or the like. The platform 710 can be lifted and removed by the lifting device 400 of the first deck slab replacement construction machine 100A that has been assembled as described above. By performing the above steps (A) to (E) on the second deck slab replacement construction machine 100B, the deck slab replacement construction system 1 for standalone use described in FIG. 3 is completed.

[0059] As described above, the deck slab replacement construction system 1 according to this embodiment can be changed between a connected use configuration and a standalone use configuration. The connected use configuration can be applied to a first construction configuration in which both the removal of the existing deck slab and the installation of a new deck slab are performed in a single work area WA. On the other hand, if the deck slab replacement construction system 1 is changed to a standalone use configuration, it can be applied to a second construction configuration in which the work area WA for removing the existing deck slab and installing the new deck slab are separated without connecting the two deck slab replacement construction machines 100A and 100B. In the connected use configuration, the extension construction girder 600 can be installed between the main construction girders 300 of the two deck slab replacement construction machines 100A and 100B, thereby extending the span of the work area WA. Furthermore, even in the standalone use mode, the extension erection girder 600 is connected to the main erection girder 300 of each of the two deck slab replacement construction machines 100A, 100B, so it is possible to make the working section WA corresponding to each deck slab replacement construction machine 100A, 100B a long span. In other words, the deck slab replacement construction system 1 can be flexibly applied to both the first construction mode and the second construction mode described above, and it is possible to make the working section WA a long span when applied to either construction mode.

[0060] Although the embodiments of the present invention have been described above, these are merely examples, and the present invention is not limited to these. Various modifications based on the knowledge of those skilled in the art are possible as long as they do not deviate from the spirit of the claims. [Explanation of symbols]

[0061] 1. Deck replacement construction system 100, 100A, 100B... Deck replacement construction machine 200···Traveling platform 300 Main erection girder 400...Lifting equipment 500···Auxiliary leg unit 600 Extension erection girder

Claims

1. A deck replacement construction system applied to deck replacement work on existing bridges, Two deck replacement construction machines each having a traveling platform that can stand on its own and move independently in the bridge axis direction, and a main erection girder that is supported by the traveling platform and extends in the bridge axis direction, with a construction machine side trolley rail on which the lifting device travels being provided along the bridge axis direction; An extension erection girder that is detachable from the main erection girder and has an extension trolley rail that is continuous with the construction machine side trolley rail when connected to the main erection girder; Equipped with A connected use form in which the existing deck slab is removed and a new deck slab is installed between the two deck slab replacement construction machines connected by erecting the extension erection girder between the main erection girders of each of the two deck slab replacement construction machines; The extension erection girder is connected to the main erection girder so that each of the main erection girders is extended without connecting the two deck slab replacement construction machines, and one of the two deck slab replacement construction machines is used as a removal machine for the existing deck slab and the other is used as an installation machine for the new deck slab. The form can be changed to a single use form. Deck replacement construction system.

2. The deck replacement construction machine includes four telescopic leg units each having a running saddle with a running wheel at the lower end thereof, In the single use form, among the traveling saddles in the deck slab replacement construction machine, the traveling saddle located on the predetermined erection girder extension direction side where the extension erection girder is connected to the main erection girder is extended in the erection girder extension direction, An extension saddle having a running wheel is connected. The deck replacement construction system according to claim 1.

3. In the single use form, an auxiliary leg unit is provided at the tip side of the extension erection girder connected to the main erection girder, and the tip side of the extension erection girder can be supported by the auxiliary leg unit. The deck replacement construction system according to claim 1 or 2.

4. The auxiliary leg unit is capable of switching its posture between a stored posture in which it is attached to the extension erection girder and a deployed posture in which it is suspended downward from the extension erection girder. The deck replacement construction system according to claim 3.

5. A deck replacement construction method using the deck replacement construction system according to claim 1, In the connected use form, the extension erection girder is erected between the main erection girders of each of the two deck slab replacement construction machines, and the existing deck slab is removed and a new deck slab is installed between the two deck slab replacement construction machines connected together. In the single use form, the extension erection girder is connected to the main erection girder so that each of the main erection girders is extended without connecting the two deck slab replacement construction machines, and one of the two deck slab replacement construction machines is used as a removal machine for the existing deck slab and the other is used as an installation machine for the new deck slab. Deck replacement construction method.

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