Deck replacement method and boom-reversal deck erection machine

Abstract

To provide a floor slab replacement method and a boom inversion type floor slab erection machine for easily and continuously removing an existing floor slab without requiring process management considering the development of mortar strength when a new floor slab is constructed.SOLUTION: A boom inversion type floor slab erection machine 1 has telescopic booms 11 which are arranged on an existing floor slab area E2 side outside a floor slab replacement area E1, and arranged parallel to the width direction at least at an interval exceeding the floor slab width and are invertible and extendable synchronously in the direction of a bridge axis, and a hanging part 12 which is hung from a boom top beam 13 connecting the tips of the telescopic booms 11 and has a turning mechanism 15. When an existing floor slab 101 is removed in the floor slab replacement area E1, the telescopic booms 11 are directed to the floor slab replacement area E1 side, the existing floor slab 101 is turned by 90 degrees by the turning mechanism 15, the telescopic booms 11 are reversed in this state, and the suspended existing floor slab 101 is moved to a carry-in / out area E. When a new floor slab is constructed, the existing floor slab 101 is constructed in the reverse order.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a deck replacement method and a boom-reversal deck erection machine that can easily and continuously remove existing decks without delaying the process due to reinforcement during the erection of new decks or casting in-place deck sections. [Background technology]

[0002] When replacing bridge decks, there are width restrictions when removing the existing deck from the bridge surface and erecting a new deck. As a result, it is not possible to use work machines such as cranes that can expand the working area in the width direction when rotating, so the work is often carried out using erection machines specifically designed for deck replacement.

[0003] A known example of an erection machine dedicated to deck replacement is a portal deck erection machine 300 having four pillars 301, as shown in Figure 14. This portal deck erection machine 300 installs the pillars 301 on the new deck 102 and the existing deck 104 on both sides of the deck replacement area E1. The upper ends of the pillars 301 have bridge sections that extend in the bridge axis direction and guide the suspension sections 302 in the bridge axis direction. The suspension sections 302 are connected to the bridge sections via a swivel mechanism 303. To remove the existing deck slab 101, the existing deck slab 101 is lifted using the lifting part 302 (A101), moved to the existing deck slab 104 side to the intermediate position P100 (A102), rotated 90 degrees by the turning mechanism 303 at the intermediate position P100 (A103), and then moved further toward the existing deck slab 104 (A104), and then hung from the loading platform of the waiting trailer 202 (A105). Then, the trailer 202 loaded with the existing deck slab 101 is transported by the tractor 201 in the unloading direction A106. Note that the erection of the new deck slab is performed in the reverse order of the procedure for removing the existing deck slab 101. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2018-104972 [Patent Document 2] Japanese Patent Application Publication No. 2017-223080 Summary of the Invention [Problem to be solved by the invention]

[0005] Conventional portal deck erection machines install columns on the new and existing decks, which are on either side of the deck replacement area. Therefore, when the deck is lifted, the reaction force of the erection machine acts on the new deck. Therefore, mortar is poured under the new deck to transmit the reaction force of the erection machine to the steel girders. In this case, since the new deck is fixed in place by pouring non-shrinkage mortar, the next deck replacement cycle cannot be started until the non-shrinkage mortar has developed its initial strength. Therefore, process management must take into account the hardening time of the non-shrinkage mortar.

[0006] On the other hand, when removing the existing deck slab in the cast-in-place deck section, the portal deck erection machine installs columns on both sides of the deck replacement area, so after removing the deck slab, it is necessary to wait until the deck slab in the cast-in-place deck section is poured and the initial strength is achieved, which delays the work process.To prevent this process delay, it is possible to pass through the cast-in-place deck section and replace only the precast deck slab, and then use a separate construction machine to remove the existing deck slab in the cast-in-place deck section, but this would incur additional construction costs.

[0007] The present invention has been made in consideration of the above, and aims to provide a deck replacement method and a boom-reversal deck erection machine that can easily remove existing decks in succession without the need for process management that takes into account the development of mortar strength when erecting new decks. [Means for solving the problem]

[0008] In order to solve the above-mentioned problems and achieve the object, the present invention provides a deck replacement method in a deck replacement area in which existing decks are sequentially removed and new decks are sequentially erected, the method comprising: a boom reversal type deck erection machine that is arranged on the existing deck side outside the deck replacement area, arranged in parallel with an interval that exceeds at least the deck width in the width direction, and has booms that are reversible and extendable synchronously in the bridge axis direction, the tips of the booms are connected by a boom top beam, and the boom top beam is hung from the hanging part with a swivel mechanism; when removing the existing deck in the deck replacement area, the boom is directed toward the deck replacement area, and the existing deck to be removed is hung from the hanging part, The existing deck slab is then rotated 90 degrees by the rotating mechanism so that its longitudinal direction is aligned in the bridge axis direction, and in this state the boom is reversed to move the suspended existing deck slab to a loading / unloading area outside the deck slab replacement area. When erecting the new deck slab in the deck replacement area, the boom is directed toward the loading / unloading area and the new deck slab, with its longitudinal direction aligned in the bridge axis direction, is hung from the hanging section. The boom is then reversed toward the deck replacement area and the suspended new deck slab is moved to the deck replacement area. The suspended new deck slab is then rotated 90 degrees by the rotating mechanism so that its longitudinal direction is aligned in the width direction, and the new deck slab is erected in this state.

[0009] In the above invention, the present invention is characterized in that a trailer for transporting the existing deck slab or for transporting the new deck slab is placed in the loading / unloading area.

[0010] In addition, in the present invention, the booms in the above invention are extended and retracted in synchronization to adjust the position of the suspending portion.

[0011] The present invention also provides a boom-reversing deck erection machine used for deck replacement in a deck replacement area where existing decks are sequentially removed and new decks are sequentially erected, the machine having booms that are arranged on the side of the existing deck outside the deck replacement area, arranged in parallel in the width direction with an interval that exceeds at least the deck width, and that are reversible and extendable in sync in the bridge axis direction, the ends of the booms are connected by a boom top beam, and have a hanging section that is suspended from the boom top beam and has a swivel mechanism, when removing the existing deck in the deck replacement area, the boom is directed toward the deck replacement area, and the existing deck to be removed is hung from the hanging section, and then the existing deck is rotated 90 degrees by the swivel mechanism so that the longitudinal direction of the existing deck is oriented in the bridge axis direction, and in this state the boom is reversed and the suspended existing deck is moved to a carry-in / carry-out area outside the deck replacement area, When erecting the new deck in the deck replacement area, the boom is directed toward the loading / unloading area, and the new deck with its longitudinal direction facing the bridge axis is hung from the hanging section, and then the boom is flipped toward the deck replacement area to move the hung new deck to the deck replacement area, and then the hung new deck is rotated 90 degrees by the swivel mechanism so that the longitudinal direction of the new deck is oriented in the width direction, and the new deck is erected in this state.

[0012] In addition, in the above invention, the present invention is characterized in that a loading / unloading area is formed on the existing deck side outside the deck replacement area, where a trailer is placed to transport the existing deck or to transport the new deck.

[0013] In addition, in the present invention, the booms in the above invention are extended and retracted in synchronization to adjust the position of the suspending portion. [Effects of the Invention]

[0014] According to the present invention, there is no need for process management that takes into account the development of mortar strength when erecting a new deck slab, and the existing deck slab can be easily removed in succession. [Brief explanation of the drawings]

[0015] [Figure 1]FIG. 1 is a schematic side view illustrating the removal work of an existing deck using a boom reversal type deck erection machine according to this embodiment. [Figure 2] FIG. 2 is a schematic plan view of the boom reversal type deck erection machine shown in FIG. [Figure 3] FIG. 3 is a schematic front view of the boom reversal type deck erection machine shown in FIG. [Figure 4] FIG. 4 is a perspective view of the boom reversing type deck erection machine shown in FIG. [Figure 5] FIG. 5 is an explanatory diagram (part 1) illustrating the deck replacement work process using the boom reversal type deck erection machine shown in FIG. [Figure 6] FIG. 6 is an explanatory diagram (part 2) illustrating the deck replacement work process using the boom reversal type deck erection machine shown in FIG. [Figure 7] FIG. 7 is an explanatory diagram (part 3) illustrating the deck replacement work process using the boom reversal type deck erection machine shown in FIG. [Figure 8] FIG. 8 is an explanatory diagram (part 4) illustrating the deck replacement work process using the boom reversal type deck erection machine shown in FIG. [Figure 9] FIG. 9 is an explanatory diagram (part 5) for explaining the deck replacement work process using the boom reversal type deck erection machine shown in FIG. [Figure 10] FIG. 10 is a diagram showing a state in which the boom reversal type deck erection machine is being transported by a truck. [Figure 11] FIG. 11 is a diagram showing a state in which the connecting beam is widened on the bed of a truck. [Figure 12] FIG. 12 is a diagram showing the state in which the boom reversal type deck slab erection machine is lowered onto the existing deck slab. [Figure 13] FIG. 13 is a diagram showing a state in which the boom reversal type deck erection machine is maintained horizontally using a cylinder jack. [Figure 14] FIG. 14 is a diagram showing an example of a conventional portal deck erection machine. DETAILED DESCRIPTION OF THE INVENTION

[0016] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. Fig. 1 is a schematic side view illustrating the removal work of an existing deck using a boom reversal type deck erection machine 1 according to this embodiment. Fig. 2 is a schematic plan view of the boom reversal type deck erection machine 1 shown in Fig. 1. Fig. 3 is a schematic front view of the boom reversal type deck erection machine 1 shown in Fig. 1. Fig. 4 is a perspective view of the boom reversal type deck erection machine 1 shown in Fig. 1. Fig. 5 is an explanatory diagram illustrating the deck replacement work process using the boom reversal type deck erection machine 1 shown in Fig. 1.

[0017] 1 to 4, the boom-reversing deck erection machine 1 is disposed in an existing deck area E2 outside the deck replacement area E1, at one end of the deck replacement area E1 where existing decks 101 are sequentially removed and new decks 102 are sequentially erected. The boom-reversing deck erection machine 1 is disposed in the width direction (±X direction) at a distance that exceeds at least the deck width of the deck divided in the bridge axis direction (±Y direction), and has two telescopic booms 11 that can be reversed and extended in synchronization in the bridge axis direction (±Y direction). The telescopic booms 11 each rotate around axes C1 and C2 of the erection machine main body 2. The tip ends of the telescopic booms 11 are connected by a boom top beam 13. The telescopic booms 11 are each rotated by a boom folding cylinder 11a and extended and retracted by a boom reversing cylinder 11b.

[0018] A hoisting unit 12 is suspended from the boom top beam 13. A width-direction movement mechanism 14 having a swivel mechanism 15 is connected to the boom top beam 13 for the hoisting unit 12, and a deck slab lifting device 17 is connected to the swivel mechanism 15 via a swivel lifting balance 16. The width-direction movement mechanism 14 fine-tunes the widthwise position of the deck slab when erecting or removing the deck slab. The swivel mechanism 15 rotates the deck slab around a vertical axis (Z-axis) when erecting or removing the deck slab. The deck slab lifting device 17 raises and lowers the suspension position of the deck slab. The width-direction movement mechanism 14, swivel mechanism 15, and deck slab lifting device 17 are driven by electric motors.

[0019] In the -Y direction of the erection machine main body 2, there is a main beam 2b that extends in the -Y direction from each axis C1, C2 and supports the telescopic boom 11. A counterweight is placed at the -Y end of the main beam 2b. The main beam 2b has tires 2a at its bottom, and a hydraulic motor enables the boom-reversal type deck slab erection machine 1 to be self-propelled. Note that the self-propelling of the boom-reversal type deck slab erection machine 1 is not limited to tires 2a, and it may also be a rail-type that moves on rails. The main beams 2b are connected by multiple connecting beams 3. A steel plate for the trailer 202 to travel on is installed on the connecting beams 3, and the trailer 202 can enter the loading / unloading area E via a slope. The erection machine main body 2 also has the function of maintaining the erection machine main body 2 level in response to longitudinal and transverse gradients, for example, by using outriggers. In addition, an engine-type hydraulic unit that drives and controls the hydraulic mechanisms of each part and a power generation unit that supplies power to the electric motor are externally arranged and connected in the -Y direction of the erection machine main body 2.

[0020] When work is to be performed in the next deck replacement area adjacent to the current deck replacement area E1 on the side of the current existing deck area E2 by self-propelling, the boom reversal type deck erection machine 1 moves in the -Y direction by self-propelling. Note that at this time, the boom reversal type deck erection machine 1 preferably self-propels with the telescopic boom 11 inverted in the -Y direction and folded. The trailer 202 is coupled to the tractor 201 and towed. Furthermore, the boom reversal type deck erection machine 1 may be controlled remotely, or the driver's seat may be located in a location that does not affect the moving work. Note that in the installed area E3 adjacent to the deck replacement area E1 in the -Y direction, a new installed deck 103 that has already been installed by replacement is placed.

[0021] <Deck replacement work process> Next, the deck replacement work process will be described with reference to Figures 5 to 9. First, as shown in Figure 5, the boom-reversing deck erection machine 1 is deployed and placed on the deck replacement area E1 side of the existing deck area E2. Then, as shown in Figure 6, the trailer 202 is moved into the carry-in / carry-out area E. After that, as shown in Figure 7, the peeled existing deck slab 101 is hung from the hoisting section 12, and the telescopic boom 11 is reversed and extended to carry it to the loading platform of the trailer 202. At this time, after being hung, the existing deck slab 101 is rotated 90 degrees by the rotating mechanism 15 so that the longitudinal direction of the existing deck slab 101 is oriented in the bridge axis direction. Then, the rotated existing deck slab 101 is maintained in that position and placed on the loading platform of the trailer 202, positioned between the telescopic booms 11. Once the two existing deck slabs 101 are placed on the trailer 202, the trailer 202 leaves the carry-in / carry-out area E and is transported.

[0022] The telescopic boom 11 is extended and retracted as needed. For example, this is done when the existing deck slab 101 is located far from the boom reversal type deck erection machine 1, or when the loading platform of the trailer 202 on which the existing deck slab 101 is to be placed is far away. The tip position of the telescopic boom 11 is adjusted and retracted so that it can cover lifting in the deck slab replacement area E1 and also cover lifting in the loading and unloading area E. In the loading and unloading area E, two decks may be loaded on the trailer 202, and the working radius of the telescopic boom 11 is adjusted in advance to a range that allows two decks to be loaded.

[0023] Specifically, as shown in Figure 1, when the position of the existing deck slab 101 in the loading / unloading area E is close to the erection machine main body 2, the boom tip traces a trajectory L1 and moves over the existing deck slab 101 as shown by arrow A1. When the position of the existing deck slab 101 in the loading / unloading area E is far from the existing deck slab area E2, the boom tip traces trajectories L1 and L2 and moves over the existing deck slab 101 as shown by arrow A2. When the existing deck slab 101 in the deck slab replacement area E1 is located far from the erection machine main body 2, the boom tip traces a trajectory L3 and extends in the +Y direction.

[0024] Thereafter, the new deck slab 102 is erected in the deck replacement area E1. First, as shown in Fig. 8, a trailer 203 carrying the new deck slab 102 enters the carry-in / carry-out area E. Then, the new deck slab 102 is moved from the trailer 203 to the deck replacement area E1 in the reverse order of the removal process of the existing deck slab 101. Specifically, the telescopic boom 11 is directed toward the loading / unloading area E, and the new deck slab 102 with its longitudinal direction oriented in the bridge axis direction is hung from the hoisting part 12, after which the telescopic boom 11 is flipped over to the deck slab replacement area E1 side and the hung new deck slab 102 is moved to the deck slab replacement area E1, after which the hung new deck slab 102 is rotated 90 degrees by the turning mechanism 15 so that the longitudinal direction of the new deck slab 102 is oriented in the width direction, and in this state the new deck slab 102 is erected on the main girder 100. When the erection of the two new deck slabs 102 placed on the trailer 203 is completed, the trailer 203 exits the loading / unloading area E.

[0025] Thereafter, as shown in Fig. 9, the boom reversal type deck erection machine 1 with the telescopic boom 11 reversed and folded is self-propelled from the next deck replacement area E1' to the existing deck area E2. Thereafter, as shown in Fig. 5, the boom reversal type deck erection machine 1 is unfolded, and the above-mentioned work procedure is repeated.

[0026] <Deployment of boom-reversing deck erection machines> Next, an overview of the deployment of the boom reversible deck erection machine 1 will be described with reference to FIGS. 10 to 13. As shown in FIG. 10, the boom reversible deck erection machine 1 is transported on a trailer 204 with multiple connecting beams 3 folded between the main beams 2b. At this time, the spacing between the main beams 2b is equal to or less than the width of the bed of the trailer 204. After the trailer 204 enters the loading / unloading area E, as shown in FIG. 11, the connecting beams 3 are widened in the width direction (±X direction) by the widening cylinders 20 and arranged. Accordingly, the main beams 2b and the telescopic boom 11 connected thereto also widen in the width direction. As a result, the main beams 2b and the telescopic boom 11 move outside the bed of the trailer 204 beyond the width of the bed. Here, by extending the cylinder jacks 21 serving as outriggers arranged at the four corners vertically downward, a gap is created between the boom reversible deck erection machine 1 and the bed of the trailer 204. In this state, the trailer 204 can move in the −X direction, and the trailer 204 exits the loading / unloading area E.

[0027] After the trailer 204 has withdrawn, as shown in Figure 12, the cylinder jack 21 is extended vertically upward to place the boom reversal type deck slab erection machine 1 on the existing deck slab 101. After that, steel plates 311 are placed on the connecting beam 3, and slopes 312 are placed at the front and rear (±Y direction) ends of the connecting beam 3 to make it easier for the trailer 205 carrying the peeled existing deck slab 101 to enter and exit the carry-in / out area E. At this time, the counterweight 30 is placed behind each main beam 2b of the erection machine body 2 (-Y direction).

[0028] 13, since the existing deck 101 has an inclined surface S such as a longitudinal gradient or a transverse gradient, the cylinder jack 21 is adjusted as an outrigger to maintain the horizontal plane H of the boom reversal type deck erection machine 1. This allows the existing deck 101 and the new deck 102 to be moved stably.

[0029] In this embodiment, the boom-reversal type deck erection machine 1 is positioned on one side of the deck replacement area E1, i.e., on the side of the existing deck area E2, and the movement of the existing deck 101 and the new deck 102 is carried out by reversing the telescopic boom 11. Therefore, there is no need for process management that takes into account the development of mortar strength when erecting the new deck 102, and there is no process delay due to deck casting in the cast-in-place section of the deck, so the existing deck 101 can be easily removed in succession and the new deck 102 can be erected in succession.

[0030] In this embodiment, the boom length allows for four deck slabs to be replaced per day, doubling work efficiency compared to the conventional rate of three deck slabs per day. Furthermore, the boom-reversing deck slab erection machine 1 has a low center of gravity, making it highly stable when moving deck slabs.

[0031] Furthermore, the configurations illustrated in the above embodiments are merely functional schematics and are not necessarily physically configured as shown. In other words, the distribution and integration of each device and component is not limited to that illustrated, and all or part of them can be functionally or physically distributed and integrated in any unit depending on various usage situations, etc. [Explanation of symbols]

[0032] 1. Boom reversing deck erection machine 2. Construction machine body 2a tires 2b Main beam 3 Connecting beams 11 Telescopic boom 11a Boom folding cylinder 11b Boom reversal cylinder 12 Hanging part 13 Boom top beam 14 Width direction movement mechanism 15 Swivel mechanism 16 Swivel lifting balance 17 Deck lifting device 20 Widening cylinder 21 Cylinder jack 30 Counterweight 100 main digit 101 Existing deck 102 New deck 103 Newly installed deck 201 Tractor 202, 203, 204, 205 Trailer 311 Iron Plate 312 Slope A1, A2 arrows E Loading / unloading area E1 Deck replacement area E2 Existing slab area E3 Installed area H horizontal plane L1~L3 orbit S slope surface

Claims

1. A slab replacement method in a slab replacement area in which existing slabs are sequentially removed and new slabs are sequentially erected, A boom-reversing deck erection machine is provided, which is arranged on the existing deck side outside the deck replacement area, has booms arranged in parallel in the width direction with an interval that exceeds at least the deck width, and is reversible and extendable synchronously in the bridge axis direction, and the tips of the booms are connected by a boom top beam, and has a hanging part that is suspended from the boom top beam and has a swivel mechanism, When removing the existing deck in the deck replacement area, the boom is directed toward the deck replacement area, and the existing deck to be removed is hung from the hanging section. The existing deck is then rotated 90 degrees by the rotating mechanism so that the longitudinal direction of the existing deck is oriented in the direction of the bridge axis. In this state, the boom is reversed, and the suspended existing deck is moved to a loading / unloading area outside the deck replacement area. When erecting a new deck in the deck replacement area, the boom is directed toward the loading / unloading area, and the new deck with its longitudinal direction facing the bridge axis direction is hung from the hanging section, then the boom is flipped toward the deck replacement area and the hung new deck is moved to the deck replacement area, and then the hung new deck is rotated 90 degrees by the rotating mechanism so that the longitudinal direction of the new deck is facing the width direction, and the new deck is erected in this state.This deck replacement method is characterized by the following.

2. 2. The deck replacement method according to claim 1, wherein a trailer for transporting the existing deck or for transporting the new deck is placed in the carrying-in / carry-out area.

3. 3. The deck replacement method according to claim 1, wherein the booms extend and retract in synchronization to adjust the position of the hanging part.

4. A boom-reversing deck erection machine used for deck replacement in a deck replacement area in which existing decks are sequentially removed and new decks are sequentially erected, The bridge has booms that are arranged on the existing deck side outside the deck replacement area, arranged in parallel in the width direction with an interval that exceeds at least the deck width, and are reversible and extendable in synchronization with the bridge axis direction, the tips of the booms are connected by a boom top beam, and a hanging part that is suspended from the boom top beam and has a swivel mechanism, When removing the existing deck in the deck replacement area, the boom is directed toward the deck replacement area, and the existing deck to be removed is hung from the hanging section. The existing deck is then rotated 90 degrees by the rotating mechanism so that the longitudinal direction of the existing deck is oriented in the direction of the bridge axis. In this state, the boom is reversed, and the suspended existing deck is moved to a loading / unloading area outside the deck replacement area. When erecting a new deck in the deck replacement area, the boom is directed toward the loading / unloading area, and the new deck with its longitudinal direction oriented in the bridge axis direction is hung from the hanging section, and then the boom is inverted toward the deck replacement area to move the hung new deck to the deck replacement area, and then the hung new deck is rotated 90 degrees by the rotating mechanism so that the longitudinal direction of the new deck is oriented in the width direction, and the new deck is erected in this state.This is a boom-reversal type deck erection machine.

5. A boom-reversal type deck erection machine as described in claim 4, characterized in that a loading / unloading area is formed on the existing deck side outside the deck replacement area, where a trailer is placed to transport the existing deck or to transport the new deck.

6. 6. A boom reversing type deck erection machine according to claim 4 or 5, wherein the booms extend and retract synchronously to adjust the position of the suspending part.

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