Method and apparatus for replacing deck slabs

Abstract

The present invention provides a floor slab replacement method and a floor slab replacement device that enable the replacement of floor slabs without using power to lift the floor slabs onto a lifting device. [Solution] A gate-type lifting device 10 for suspending the deck slabs 3 and 4 and a transport trolley 20 for transporting the deck slabs 3 and 4 are used. A deck slab transfer process is performed by raising and lowering a mounting platform 23 provided on the transport trolley 20 to transfer the deck slab 4 between the lifting device 10 and the transport trolley 20. A deck slab moving process is performed by moving the deck slabs 3 and 4 suspended from the lifting device 10 in the bridge axis direction using a second moving mechanism 18 provided on the lifting device 10. A deck slab lowering process is performed by moving only the deck slabs 4 downwards using a lowering mechanism 17 provided on the lifting device 10. By raising the deck slab 4 using the mounting platform 23 provided on the transport trolley 20, the deck slabs 3 and 4 can be transferred to the lowering mechanism 17.

Description

Technical Field

[0001] The present invention relates to a floor slab replacement method and a floor slab replacement device for removing an existing floor slab from the main girder of an elevated bridge and installing a new floor slab, for example.

Background Art

[0002] Conventionally, in elevated bridges such as general roads and highways, when an existing floor slab deteriorates, a floor slab replacement construction is carried out in which the existing floor slab is removed from the main girder and a new floor slab is installed. In this case, for the new floor slab, for example, a construction method is used in which a plurality of precast floor slabs made of concrete manufactured in a factory are arranged in the bridge axis direction to construct a new floor slab.

[0003] In this floor slab replacement construction, a crane truck is used for removing the existing floor slab and installing the new floor slab. However, since even one precast floor slab is heavy, a large crane truck is required. Such a large crane truck has a large installation width with the outriggers extended, and for example, on a two-lane road, it is necessary to stop all traffic. However, when all traffic on a two-lane road is stopped, the impact of traffic congestion due to traffic interruption during construction is large, so the replacement construction must be carried out in sections one by one using time zones with less traffic volume such as at night. For this reason, the construction period is prolonged, and traffic regulation by stopping all traffic is extremely difficult on arterial roads and highways with a large traffic volume at all times.

[0004] Therefore, conventionally, for example, in the case of a two-lane road, a so-called floor slab replacement work by width direction division has been carried out in which only one lane on one side is closed to traffic, and the removal and installation of the floor slab are carried out one lane at a time to avoid stopping all traffic. As a construction method for replacing the floor slab in a narrow construction site for one lane without using a crane truck, a method using a gantry type lifting device movable in the bridge axis direction is known (see, for example, Patent Document 1).

[0005] In this construction method, the existing deck slab in the section to be replaced is cut perpendicular to the bridge axis, the cut block-shaped deck slab is lifted using a lifting device, the deck slab is rotated 90 degrees so that its longitudinal direction is aligned with the bridge axis, the deck slab is moved to a transport vehicle using the lifting device and placed on the vehicle's loading platform, the lifting device is then moved to the next deck slab removal position in the bridge axis direction, and the removal of the existing deck slab is carried out sequentially in the bridge axis direction, thereby removing the existing deck slab in the section to be replaced from above the main girder.

[0006] After this, the precast deck slabs for the new construction are transported by a transport vehicle to the lifting device, where they are lifted by the lifting device with their longitudinal direction aligned with the bridge axis and moved to the deck slab installation position. The deck slabs are then rotated 90 degrees so that their longitudinal direction is perpendicular to the bridge axis, and lowered onto the main girders for installation. After that, the lifting device is moved to the next deck slab installation position in the bridge axis direction, and the deck slab installation work is carried out sequentially in the bridge axis direction, thereby installing new precast deck slabs in the deck slab replacement section. [Prior art documents] [Patent Documents]

[0007] [Patent Document 1] Japanese Patent Publication No. 2016-98489 [Overview of the Initiative] [Problems that the invention aims to solve]

[0008] However, in the aforementioned conventional examples, when assembling the lifting device for replacing the deck slab on-site, it is common to install it using a crane. However, in urban areas where there are obstacles such as buildings around, or in construction sites where both sides of the construction zone are surrounded by passing vehicles, it is impossible to rotate the crane, and assembling the lifting device in a narrow site, such as when replacing the deck slab by dividing it in the width direction, is extremely difficult.

[0009] Furthermore, in the aforementioned conventional example, the lifting and lowering of the bridge deck is performed using an electric chain hoist installed on the lifting device. When lowering the bridge deck, the power can be used to quickly lower the deck to the installation position, making the lowering operation efficient. However, when lifting the bridge deck, it is necessary to finely adjust the lifting height of the bridge deck to match the gradient of the road alignment in the direction perpendicular to the bridge axis. However, with high-speed movement using power, it is difficult to make fine adjustments to the height position, resulting in the problem that the bridge deck lifting operation cannot be performed efficiently.

[0010] The present invention has been made in view of the above-mentioned problems, and its objective is to provide a floor slab replacement method and a floor slab replacement device that can perform floor slab replacement work without using power to lift the floor slab onto a lifting device. Another objective of the present invention is, in addition to the above objective, to provide a floor slab replacement method and a floor slab replacement device that can easily and quickly install a lifting device on site without using a crane. [Means for solving the problem]

[0011] To achieve the above objective, the present invention provides a bridge deck replacement method that uses a gate-type suspension device for suspending a bridge deck and a bridge deck transport means for transporting a bridge deck, to remove an existing bridge deck from the main girder and install a new bridge deck on the main girder, wherein the method includes a bridge deck transfer step in which a bridge deck is transferred between the suspension device and the bridge deck transport means by raising and lowering a bridge deck mounting section provided on the bridge deck transport means, a bridge deck movement step in which the bridge deck suspended from the suspension device is moved in the bridge axis direction by a movement mechanism provided on the suspension device, and a bridge deck lowering step in which the bridge deck suspended from the suspension device is lowered only by a suspension mechanism provided on the suspension device.

[0012] Furthermore, in the method described above, the present invention uses a suspension device that comprises an extension member that can extend in the bridge axis direction, a support member that supports the extension member, a gate-shaped frame to which the support member is fixed, and a support leg that supports the tip of the extension member from below, wherein the moving mechanism is provided on the extension member.

[0013] Furthermore, in the method described above, the present invention uses a lifting device that is formed to be expandable and contractible in the vertical and horizontal directions so that the gantry frame can be transported by a transport vehicle.

[0014] Furthermore, in order to achieve the above objective, the present invention provides a deck slab replacement device comprising a gate-type lifting device for suspending a deck slab and a deck slab transporting means for transporting a deck slab, for removing an existing deck slab from the main girder and installing a new deck slab on the main girder, wherein the deck slab transporting means is provided with a lifting unit that raises and lowers a deck slab mounting section on which the deck slab is placed, thereby transferring the deck slab between the lifting device and the deck slab transporting means, a moving mechanism provided on the lifting device for moving the deck slab suspended from the lifting device in the bridge axis direction, and a lowering mechanism provided on the lifting device for lowering the deck slab suspended from the lifting device only.

[0015] Furthermore, in the above configuration, the present invention comprises an extension member that can extend in the bridge axis direction, a support member that supports the extension member, a gate-shaped frame to which the support member is fixed, and a support leg that supports the tip of the extension member from below, and the moving mechanism is provided on the extension member.

[0016] Furthermore, in the above configuration, the present invention is formed so that the gantry frame can be extended and retracted in the vertical and horizontal directions so that it can be transported by a transport vehicle.

[0017] As a result, the floor slab is raised by a floor slab placement section provided on the floor slab transporting means, and the floor slab is transferred between the lifting device and the floor slab transporting means. Therefore, it is not necessary to lift the floor slab electrically or to adjust the lifting height of the floor slab by power, as in the conventional method. Furthermore, by returning the extension member of the lifting device to its unextended state and reducing the gantry frame in the vertical and horizontal directions, the lifting device can be made smaller and easier to transport. Additionally, by extending the extension member and extending the gantry frame in the vertical and horizontal directions, the lifting device can be transformed into a form that can be used under its own power. [Effects of the Invention]

[0018] According to the present invention, since it is not necessary to electrically lift the deck slab or adjust the lifting height of the deck slab by power, as in the conventional method, the deck slab lifting work can be performed efficiently in a short time, which is extremely advantageous in deck slab replacement work that involves lane closures. In addition to the above effects, the lifting device can be made smaller for easier transport, and at the site of deck slab replacement work, the lifting device can be transformed into a form that can be used independently, so the lifting device can be installed on site without using a crane. As a result, even in narrow sites such as deck slab replacement work that divides the width direction, construction can be easily and quickly carried out with a lifting device that does not require assembly work, and construction time can be significantly reduced. [Brief explanation of the drawing]

[0019] [Figure 1] Side view of the suspension device for a deck slab replacement device showing the first embodiment of the present invention. [Figure 2] Side view of the transport trolley and transfer device for the deck slab replacement equipment. [Figure 3] Side view showing the installation process of the lifting device. [Figure 4] Rear view showing the installation process of the lifting device. [Figure 5] Plan view showing the installation process of the lifting device. [Figure 6] Rear view showing the installation process of the lifting device. [Figure 7] Plan view showing the installation process of the hoisting device [Figure 8] Side view showing the installation process of the hoisting device [Figure 9] Rear view showing the installed state of the hoisting device [Figure 10] Plan view of the hoisting device [Figure 11] Side view of the floor slab replacement device showing the floor slab removal process [Figure 12] Side view of the floor slab replacement device showing the floor slab removal process [Figure 13] Side view of the floor slab replacement device showing the floor slab removal process [Figure 14] Side view of the floor slab replacement device showing the floor slab removal process [Figure 15] Side view of the floor slab replacement device showing the floor slab removal process [Figure 16] Side view of the floor slab replacement device showing the floor slab removal process [Figure 17] Side view of the floor slab replacement device showing the floor slab removal process [Figure 18] Side view of the floor slab replacement device showing the floor slab removal process [Figure 19] Side view of the floor slab replacement device showing the floor slab removal process [Figure 20] Side view of the floor slab replacement device showing the floor slab new installation process [Figure 21] Side view of the floor slab replacement device showing the floor slab new installation process [Figure 22] Side view of the floor slab replacement device showing the floor slab new installation process [Figure 23] Side view of the floor slab replacement device showing the floor slab new installation process [Figure 24] Side view of the floor slab replacement device showing the floor slab new installation process [Figure 25] Side view of the floor slab replacement device showing the floor slab new installation process [Figure 26] Side view of the floor slab replacement device showing the floor slab new installation process [Figure 27] Side view of the floor slab replacement device showing the floor slab new installation process [Figure 28] Side view of the floor slab replacement device showing the floor slab new installation process [Figure 29] Side view of the floor slab replacement device showing the floor slab new installation process [Figure 30] Side view of a lifting device and transport vehicle showing a second embodiment of the present invention. [Figure 31] Side view of a deck slab replacement device showing the deck slab removal process according to the third embodiment of the present invention. [Figure 32] Side view of a deck replacement device showing the deck removal process. [Modes for carrying out the invention]

[0020] Figures 1 to 29 show a first embodiment of the present invention, illustrating a bridge deck replacement method and bridge deck replacement apparatus for removing an existing deck from a bridge and installing a new deck. Figures 13 to 27 and 30 are side views of the bridge deck replacement apparatus as seen from the direction of the arrow XX in Figure 9.

[0021] The elevated bridge 1 shown in the figure comprises a plurality of main girders 2 arranged at intervals perpendicular to the bridge axis, with existing deck slabs 3 installed on each main girder 2. In this embodiment, for example, the case in which the existing deck slabs 3 of a two-lane elevated bridge 1 used by general vehicles A are replaced with new precast deck slabs 4 one lane at a time.

[0022] The bridge deck replacement device of this embodiment includes a gantry-type lifting device 10 for suspending the bridge decks 3 and 4 at the bridge deck replacement location, a transport trolley 20 for transporting the bridge decks 3 and 4 in the bridge axis direction, and a transshipment device 30 for transferring the bridge decks 3 and 4 between the transport trolley 20 and a transport vehicle 50. In the following, the front-rear direction refers to the bridge axis direction, and the width direction refers to the direction perpendicular to the bridge axis.

[0023] The suspension device 10 comprises a pair of first frames 11 in the width direction provided below the main body of the device, a pair of second frames 12 in the front-rear direction as a gate-type frame provided on the main body of the device, an extension member 13 provided so as to be extendable in the front-rear direction, a support member 14 that supports the extension member 13 so as to be movable in the front-rear direction, a first moving mechanism 15 that moves the extension member 13 in the front-rear direction along the support member 14, a support leg 16 that supports the tip of the extension member 13, a suspension mechanism 17 that lowers the deck slabs 3 and 4 from the extension member 13, a second moving mechanism 18 that moves the suspension mechanism 17 in the front-rear direction along the extension member 13, and a traveling unit 19 that moves the suspension device 10 in the bridge axis direction.

[0024] Each first frame 11 is formed to extend in the direction of the bridge axis, and a traveling unit 19 is provided at one end and the other end in the longitudinal direction of each frame.

[0025] Each second frame 12 is formed in a gate shape by joining a pair of widthwise L-shaped members, which are expandable in the vertical and widthwise directions, in the front-to-back direction at their upper ends, and their lower ends are connected to each first frame 11.

[0026] The extension member 13 consists of a pair of steel members extending in the front-rear direction and in the width direction, and is formed to be approximately the same length as the support member 14.

[0027] The support member 14 consists of a pair of steel members extending in the front-rear direction and fixed to each of the second frames 12. Below each support member 14, an extension member 13 is positioned, and the extension member 13 is supported by the support member 14 via a first moving mechanism 15.

[0028] The first moving mechanism 15 is provided at two locations, front and rear, on the extension member 13 and the support member 14, and is powered to move the extension member 13 relative to the support member 14 in the bridge axis direction. In this case, the first moving mechanism 15 is composed of, for example, a well-known electric trolley.

[0029] The support leg 16 is rotatably mounted at the tip of the extension member 13 and is configured to extend and retract in the longitudinal direction. In this case, one end of the support leg 16 is rotatably connected to the extension member 13 via a rotatable support portion 16a, and the support leg 16 is configured to rotate around the rotatable support portion 16a as a pivot point from a position extending vertically downward from the extension member 13 to a position extending horizontally along the extension member 13.

[0030] The suspension mechanism 17 is located in the center of a beam member 17a that extends across the extension member 13, and a suspension beam 17c is attached to its lower end via a suspension member 17b. The suspension mechanism 17 consists of a chain block that can be switched between electric and manual operation. When lowering the suspension beam 17c, the suspension member 17b is unwound electrically, and when lifting, the suspension member 17b is wound up manually. The suspension beam 17c is also supported by the suspension mechanism 17 so as to be rotatable in the horizontal direction.

[0031] The second moving mechanism 18 is provided on the extension member 13 and is configured to move the beam member 17a of the suspension mechanism 17 in the front-rear direction by power. In this case, the second moving mechanism 18 is configured, for example, by a well-known electric trolley.

[0032] The running unit 19 is equipped with a powered moving mechanism and is designed to travel along rails 19a laid on the existing deck 3. In this case, the running unit 19 can be one that uses wheels or one that slides along rails 19a, and is driven by a motor, engine, or hydraulic jack.

[0033] The transport trolley 20 has a pair of self-propelled running units 22 in the width direction at the front and rear ends of the trolley body 21, and the running units 22 are configured to travel along rails 22a laid on the existing floor slab 3. The trolley body 21 is provided with a mounting platform 23 for placing the floor slabs 3 and 4 on, and a plurality of hydraulic jacks 24 as lifting mechanisms for raising and lowering the mounting platform 23.

[0034] The transshipment device 30 consists of a pair of first frames 31 with widths extending in the direction of the bridge axis, a pair of second frames 32 with widths extending downward from one longitudinal end and the other end of each first frame 31, and a suspension member 33 extending in the front-rear direction.

[0035] Each first frame 31 is formed such that both ends are located on the upper ends of each second frame 32, and is connected to one another by a plurality of crossbeams 31a that extend in the width direction.

[0036] Each second frame 32 is connected at its upper end to the first frame 31 and fixed at its lower end onto the existing floor slab 3.

[0037] The suspension member 33 is formed to extend linearly in the horizontal direction and is fixed to each crossbeam 31a of the first frame 31 so as to be located in the center perpendicular to the bridge axis. Multiple suspension mechanisms 33a are provided on the suspension member 33 at intervals along the longitudinal direction of the suspension member 33, and each suspension mechanism 33a is used to lift and lower the deck slabs 3 and 4. For each suspension mechanism 33a, for example, a well-known electric chain hoist can be used.

[0038] Next, a method for replacing a bridge deck using the bridge deck replacement device of this embodiment will be described with reference to Figures 3 to 29. The existing bridge deck 3 to be removed has been pre-cut perpendicular to the bridge axis at multiple positions in the bridge axis direction such that the length in the bridge axis direction is shorter than the length perpendicular to the bridge axis.

[0039] First, as shown in Figures 3 to 5, the lifting device 10 is transported to the construction site by a transport vehicle 40 and installed. In this case, the lifting device 10 is loaded onto the transport vehicle 40 in a state where the overall external dimensions are minimized by reducing each second frame 12 in the vertical and widthwise directions, shortening the extension members 13 so that their extension length from the support members 14 is minimized, and folding the support legs 16 below the support members 14. At this time, the lifting device 10 is supported with the extension members 13 resting on a frame 41 provided on the loading platform of the transport vehicle 40.

[0040] Next, when installing the lifting device 10 at the construction site, as shown in Figures 6 to 8, each second frame 12 is extended outward in the width direction, and then each second frame 12 is extended downward so that the running unit 19 of each second frame 12 lands on the pre-laid rail 19a, and then each second frame 12 is extended further to raise the upper part of the lifting device 10.

[0041] After this, the lifting device 10 is moved along the rail 19a to the construction site, and as shown in Figures 7 to 10, the extension member 13 is extended forward, and the support legs 16 are rotated to extend downward until they are vertical, and the front end of the extension member 13 is supported by the support legs 16, thereby completing the installation of the lifting device 10.

[0042] Furthermore, the transshipment device 30 is installed at a distance from the lifting device 10 in the direction of the bridge axis, and rails 22a for the transport trolley 20 are laid on the existing deck 3 so that the transport trolley 20 can travel between the lifting device 10 and the transshipment device 30.

[0043] As described above, after the installation of the lifting device 10, transport trolley 20, and transfer device 30 is completed, the existing floor slab 3 is removed.

[0044] First, as shown in Figure 11, the suspension mechanism 17 is moved along the extension member 13 by the second moving mechanism 18 and positioned on one end of the extension member 13. At the same time, the suspension beam 17c is electrically lowered by the suspension mechanism 17 and connected to the existing floor slab 3 via multiple wires 17d.

[0045] Next, the suspension mechanism 17 is switched to manual mode, and the existing floor slab 3 is lifted to a predetermined height by the worker B manually winding up the manual hoisting wire 17e of the suspension mechanism 17.

[0046] Next, the suspension mechanism 17, which suspends the existing deck slab 3, is moved by the second moving mechanism 18 to a position where the existing deck slab 3 can rotate. After rotating the existing deck slab 3 by 90° so that its longitudinal direction is aligned with the bridge axis direction, as shown in Figure 12, the suspension mechanism 17, which suspends the existing deck slab 3, is moved toward the other end of the extension member 13, as shown in Figure 13, and the existing deck slab 3 is moved above the transport trolley 20 waiting on the main body side of the suspension device 10, as shown in Figure 14.

[0047] Next, as shown in Figure 15, the mounting platform 23 of the transport trolley 20 is raised by each hydraulic jack 24, and the existing floor slab 3 is slightly pushed up by the mounting platform 23, transferring the load of the existing floor slab 3 to the mounting platform 23. Then, the connection between the wire 17d of the suspension mechanism 17 and the existing floor slab 3 is released, and the existing floor slab 3 is placed on the mounting platform 23.

[0048] Next, as shown in Figure 16, the platform 23 on which the existing floor slab 3 is placed is lowered, and as shown in Figure 17, the transport trolley 20 is moved along the rail 22a to the transfer device 30, and each of the suspension mechanisms 33a of the transfer device 30 is connected to the existing floor slab 3 of the transport trolley 20 via multiple wires 33b.

[0049] Next, as shown in Figure 18, the existing floor slab 3 is raised by each of the suspension mechanisms 33a of the transfer device 30, and the transport trolley 20 is moved to the side of the lifting device 10. Then, as shown in Figure 19, the existing floor slab 3 is lowered onto the loading platform of the transport vehicle 50, which has driven under the transfer device 30, by each of the suspension mechanisms 33a. The existing floor slab 3 is then transferred from the transport trolley 20 to the transport vehicle 50, and the transport vehicle 50 carries the existing floor slab 13 out of the site.

[0050] After this, the second and subsequent existing deck slabs 3 are removed sequentially using the same process as described above, and then a new precast deck slab 4 is installed on the main girder 2. The precast deck slab 4 is formed so that its length in the bridge axis direction when installed on the main girder 2 is shorter than its length in the direction perpendicular to the bridge axis.

[0051] First, as shown in Figure 20, the new precast floor slabs 4 are lifted from the transport vehicle 50 that has entered below the transfer device 30 by each lifting mechanism 33a. Then, the transport vehicle 50 is removed from the transfer device 30, and as shown in Figure 21, the transport trolley 20 is moved to below the transfer device 30. Finally, as shown in Figure 22, the precast floor slabs 4 are lowered onto the mounting platform 23 of the transport trolley 20 by each lifting mechanism 33a.

[0052] Next, as shown in Figures 23 and 24, the transport trolley 20 on which the precast floor slab 4 is placed is moved from the transfer device 30 to below the lifting device 10. Then, as shown in Figure 25, the platform 23 of the transport trolley 20 is raised by each hydraulic jack 24 to connect the precast floor slab 4 to the wire 17d of the suspension mechanism 17. After that, as shown in Figure 26, the platform 23 is lowered to transfer the load of the precast floor slab 4 to the suspension mechanism 17.

[0053] Next, as shown in Figure 27, the suspension mechanism 17, which suspends the precast deck slab 4, is moved by the second moving mechanism 18 to a position where the precast deck slab 4 can be rotated. Then, as shown in Figure 28, the existing deck slab 3 is rotated 90° so that its longitudinal direction is perpendicular to the bridge axis. After that, as shown in Figure 29, the suspension mechanism 17, which suspends the precast deck slab 4, is moved above the deck slab installation position, and the precast deck slab 4 is lowered electrically by the suspension mechanism 17, thereby installing the precast deck slab 4 on the main girder 2.

[0054] Then, by installing the second and subsequent precast deck slabs 4 on the main girder 2 using the same process as described above, the installation of new precast deck slabs 4 at the location where the deck slabs were removed is completed.

[0055] After this, the suspension device 10 is moved toward the other end in the bridge axis direction by the amount of the next deck replacement range, and the deck removal process and deck installation process described above are repeated to sequentially perform deck replacement work in the bridge axis direction.

[0056] As described above, according to this embodiment, a gate-type lifting device 10 for suspending the deck slabs 3 and 4 and a transport trolley 20 for transporting the deck slabs 3 and 4 are used, and a platform 23 provided on the transport trolley 20 is raised and lowered to perform a deck slab transfer process in which the deck slabs 4 are transferred between the lifting device 10 and the transport trolley 20, a deck slab moving process in which the deck slabs 3 and 4 suspended from the lifting device 10 are moved in the bridge axis direction by a second moving mechanism 18 provided on the lifting device 10, and a deck slab lowering process in which the deck slabs 3 and 4 suspended from the lifting device 10 are moved only downward by a suspension mechanism 17 provided on the lifting device 10. Therefore, by raising the deck slabs 4 with the platform 23 provided on the transport trolley 20, the deck slabs 3 and 4 can be transferred to the suspension mechanism 17. This eliminates the need to lift the deck slab with power as in conventional methods, and also eliminates the need to adjust the lifting height of the deck slab with power. As a result, the deck slab lifting work can be performed quickly and efficiently, which is extremely advantageous in deck slab replacement work that involves lane closures.

[0057] In this case, the existing floor slab 3 on the main girder 2 is manually lifted by the suspension mechanism 17 of the lifting device 10, then the existing floor slab 3 suspended from the lifting device 10 is moved by the second moving mechanism 18 to above the mounting platform 23 of the transport trolley 20, the existing floor slab 3 is lowered by the suspension mechanism 17 and placed on the mounting platform 23, and then the existing floor slab 3 is transported and removed by the transport trolley 20. As a result, the lifting height position of the existing floor slab 3 can be easily fine-tuned manually, and the lifting work of the existing floor slab 3 can be performed quickly and efficiently during the floor slab removal process.

[0058] Furthermore, the new precast floor slab 4, which is placed on the mounting platform 23 of the transport trolley 20, is transported to the lifting device 10 by the transport trolley 20. The precast floor slab 4 is then lifted by the lifting device 10 by raising and lowering the mounting platform 23 of the transport trolley 20. The precast floor slab 4, which is suspended from the lifting device 10, is then moved to the floor slab installation position by the second moving mechanism 18. The precast floor slab 4 is then lowered by the suspension mechanism 17 and installed on the main girder 2. As a result, there is no need to lift the precast floor slab 4 with the lifting device 10 during the new floor slab installation process, and the installation of the precast floor slab 4 can be carried out quickly and efficiently.

[0059] Furthermore, by using a transport trolley 20 equipped with a mounting platform 23, the floor slabs 3 and 4 are transferred between the transport vehicle 50 and the transport trolley 20, and the floor slabs 3 and 4 are transported between the lifting device 10 and the transport vehicle 50 by the transport trolley 20. This makes it possible to transport the floor slabs 3 and 4 to the lifting device 10 even in narrow sites where it is difficult for the transport vehicle 50 to enter the lifting device 10.

[0060] Furthermore, by using a transshipment device 30 configured to lift and lower the floor slabs 3 and 4, the transshipment of floor slabs 3 and 4 between the transport trolley 20 and the transport vehicle 50 can be performed without using a crane. In this case, by performing floor slab removal or installation work with the lifting device 10 while simultaneously performing floor slab transshipment work between the transport trolley 20 and the transport vehicle 50 with the transshipment device 30, the overall efficiency of the floor slab replacement work can be improved.

[0061] Furthermore, the lifting device 10 includes an extendable member 13 that can extend in the bridge axis direction, a support member 14 that supports the extendable member 13, a gate-shaped second frame 12 to which the support member 14 is fixed, and support legs 16 that support the tip of the extendable member 13 from below. Since the second moving mechanism 18 is provided on the extendable member 13, by extending the extendable member 13 in the bridge axis direction and supporting the tip of the extendable member 13 with the support legs 16, the range of motion of the second moving mechanism 18 can be sufficiently secured by the extendable member 13. In addition, by returning the extendable member 13 to its unextended state, the lifting device 10 can be made smaller in the front-rear direction, making it easier to transport the lifting device 10.

[0062] In this case, since each second frame 12 is formed to be expandable and contractible in the vertical and horizontal directions, by reducing each second frame 12, the lifting device 10 can be miniaturized in the vertical and horizontal directions to a size that can be transported by the transport vehicle 40, and the lifting device 10 can be easily transported by the transport vehicle 40. Furthermore, when installing the lifting device 10, by extending each second frame 12, it can be lowered from the transport vehicle 40 to the road surface on its own, so there is no need to use a large crane or the like to install the lifting device 10, and the installation work of the lifting device 10 can be carried out very easily and quickly.

[0063] Furthermore, since the support legs 16 are rotatably attached to the extension member 13, the lifting device 10 can be further miniaturized during transport by rotating the support legs 16 toward the extension member 13.

[0064] In other words, according to this embodiment, by returning the extension member 13 of the lifting device 10 to its unextended state and reducing each second frame 12 in the vertical and width directions, the lifting device 10 can be made smaller and easier to transport. Furthermore, at the site of floor slab replacement work, the lifting device 10 can be transformed into a self-operated form by extending the extension member 13 and extending each second frame 12 in the vertical and width directions, so that the lifting device 10 can be installed on site without using a crane. As a result, even in narrow sites such as floor slab replacement work divided in the width direction, construction can be easily and quickly carried out with the lifting device 10 that does not require assembly work, and construction time can be significantly reduced.

[0065] Furthermore, while on-site cranes (which move the suspended load using a traversing device and use power for hoisting) require inspection after installation is complete, the lifting device 10 of this embodiment differs from cranes in that it does not lift the floor slabs 3 and 4 with power. Therefore, it may not be subject to the post-installation inspection required for cranes, and in such cases, the construction period can be shortened by not having to spend time on inspections.

[0066] In the first embodiment described above, the precast floor slab 4 was shown being transferred from the transport vehicle 50 to the transport trolley 20 and then transported to the lifting device 10. However, without using the transport trolley 20, the precast floor slab 4 may be transported directly to the lifting device 10 by the transport vehicle 60, as shown in the second embodiment in Figure 30.

[0067] In this case, the transport vehicle 60 is equipped with a platform 61 as a platform for placing the floor slabs and a hydraulic jack 62 as a lifting mechanism for raising and lowering the platform 61. The floor slabs 3 and 4 are transferred by raising and lowering the platform 61 using the hydraulic jack 62.

[0068] This allows for efficient loading and unloading of floor slabs 3 and 4 to and from the lifting device 10 at sites where transport vehicles 60 can access the lifting device 10.

[0069] Furthermore, in the first embodiment described above, the lifting of the existing deck slab 3 on the main girder 2 was performed by manual operation of the suspension mechanism 17 during the deck slab removal process. However, as in the third embodiment shown in Figures 31 and 32, when the existing deck slab 3 is removed using the deck slab removal device 70, the existing deck slab 3 removed by the deck slab removal device 70 may be raised to the suspension height of the suspension mechanism 17 by the deck slab removal device 70, and the existing deck slab 3 may be connected to the wire 17d of the suspension beam 17c.

[0070] The deck slab removal device 70 consists of a pair of legs 71 spaced apart from each other in the bridge axis direction, a beam section 72 supported at both longitudinal ends by each leg section 71, a pair of fastening rods 73 fastened at their lower ends to the existing deck slab 3, and a plurality of hydraulic jacks 74 that raise each fastening rod 73 relative to the beam section 72. Each fastening rod 73 is formed to a length that allows the existing deck slab 3 to be raised to the suspension height of the suspension mechanism 17.

[0071] In this embodiment, as shown in Figure 31, the fastening rods 73 of the slab removal device 70 are fastened to the existing slab 3, and as shown in Figure 32, the fastening rods 73 are raised by the hydraulic jacks 74, thereby separating the existing slab 3 from the main girder 2. At the same time, the slab removal device 70 raises the existing slab 3 to the suspension height of the suspension mechanism 17, and connects the existing slab 3 to the wire 17d of the suspension beam 17c. This allows the existing slab 3 to be lifted without manually lifting it with the suspension mechanism 17. As a result, similar to the above embodiment, the existing slab 3 can be handed over to the suspension mechanism 17 without the need for lifting by the suspension mechanism 17.

[0072] Furthermore, in the first embodiment described above, the existing floor slab 3 is shown to be lifted from the transport trolley 20 by each of the suspension mechanisms 33a of the transfer device 30 as shown in Figure 18. However, the existing floor slab 3 may also be handed over to each of the suspension mechanisms 33a of the transfer device 30 by raising the platform 23 of the transport trolley 20 on which the existing floor slab 3 is placed.

[0073] Furthermore, in the first embodiment, as shown in Figure 20, the new floor slab 4 is lifted from the transport vehicle 50 by each of the suspension mechanisms 33a of the transfer device 30. However, as shown in the second embodiment, a transport vehicle 60 equipped with a mounting platform 61 may be used, and the new floor slab 4 may be handed over to each of the suspension mechanisms 33a of the transfer device 30 by raising the mounting platform 61 of the transport vehicle 60 on which the new floor slab 4 is placed.

[0074] The above embodiments are examples of the present invention, and the present invention is not limited thereto. [Explanation of Symbols]

[0075] 1...Bridge, 2...Main girder, 3...Existing deck slab, 4...Precast deck slab, 10...Lifting device, 11...First frame, 12...Second frame, 13...Extending member, 14...Support member, 15...First moving mechanism, 17...Suspension mechanism, 18...Second moving mechanism, 20...Transport trolley, 23...Platform, 24...Hydraulic jack, 30...Transfer device, 40, 50, 60...Transport vehicles, 61...Platform, 62...Hydraulic jack, 70...Deck slab removal device.

Claims

1. In a deck slab replacement method that uses a gate-type lifting device for suspending the deck slab and a deck slab transporting means for transporting the deck slab, the existing deck slab is removed from the main girder and a new deck slab is installed on the main girder, A floor slab transfer process is performed by raising and lowering the floor slab placement section provided on the floor slab transport means, thereby transferring the floor slab between the lifting device and the floor slab transport means. A deck slab moving process involves moving the deck slab suspended from the suspension device in the axial direction of the bridge using a moving mechanism provided on the suspension device. This includes a floor slab lowering process in which the floor slab suspended from the suspension device is lowered only by a suspension mechanism provided on the suspension device. A method for replacing a floor slab characterized by the following:

2. The existing floor slab suspended from the aforementioned suspension device is moved by the aforementioned moving mechanism to above the floor slab placement section of the floor slab transport means. After the floor slab is lowered by the aforementioned suspension mechanism and placed on the floor slab mounting section, The deck slabs are transported and removed using a deck slab transport system. The method for replacing a floor slab according to claim 1, characterized by its features.

3. The existing deck slab is manually lifted from the main girders to the lifting height of the lifting device, and then suspended by the lifting device. The method for replacing a floor slab according to claim 1, characterized by its features.

4. Using a deck slab separation device that separates the existing deck slab from the main girder, The existing deck slab, detached from the main girder, is raised to the suspension height of the lifting device using a deck slab detachment device and then suspended by the lifting device. The method for replacing a floor slab according to claim 1, characterized by its features.

5. The new floor slab placed on the aforementioned floor slab mounting section is transported to the lifting device by the floor slab transport means. By raising and lowering the floor slab mounting section, the floor slab is suspended by the suspension device, The floor slab suspended from the suspension device is moved to the floor slab installation position by the aforementioned moving mechanism. The floor slab is lowered using the aforementioned suspension mechanism and installed on the main girder. The method for replacing a floor slab according to claim 1, characterized by its features.

6. The aforementioned floor slab transport means includes a transport trolley equipped with a floor slab mounting section and a transport vehicle for transferring floor slabs between the transport trolley and the transport vehicle. The method for replacing a floor slab according to claim 1, characterized by its features.

7. The floor slab is transferred between the transport trolley and the transport vehicle using a transfer device that can lift and lower the floor slab. The method for replacing a floor slab according to claim 6, characterized by its features.

8. As the deck slab transport means, a transport vehicle equipped with the deck slab mounting section is used. The method for replacing a floor slab according to claim 1, characterized by its features.

9. The suspension device comprises an extension member that can extend in the bridge axis direction, a support member that supports the extension member, a gate-shaped frame to which the support member is fixed, and support legs that support the tip of the extension member from below, and the suspension device is provided with the moving mechanism attached to the extension member. The method for replacing a floor slab according to claim 1, characterized by its features.

10. As the lifting device, a lifting device is used in which the gantry frame is formed to be expandable and contractible in the vertical and horizontal directions so that it can be transported by a transport vehicle. The method for replacing a floor slab according to claim 9, characterized by its features.

11. As the aforementioned suspension device, a suspension device is used in which the support legs are rotatably mounted on the extension member. The method for replacing a floor slab according to claim 9, characterized by its features.

12. A deck slab replacement device comprising a gate-type lifting device for suspending a deck slab and a deck slab transporting means for transporting the deck slab, for removing an existing deck slab from the main girder and installing a new deck slab on the main girder, The aforementioned floor slab transport means includes a lifting unit that raises and lowers a floor slab placement unit on which the floor slab is placed, thereby transferring the floor slab between the lifting device and the floor slab transport means, A suspension device is provided with a moving mechanism that moves the deck slab suspended from the suspension device in the bridge axis direction, It is equipped with a suspension mechanism that is installed on the suspension device and is designed to lower only the floor slab suspended from the suspension device. A deck slab replacement device characterized by the following.

13. The aforementioned suspension mechanism is configured to lower the deck slab using power and to lift the deck slab manually. The deck slab replacement device according to claim 12, characterized by its features.

14. The system includes a deck slab removal device that separates the existing deck slab from the main girders and raises it to the suspension height of the lifting device. The deck slab replacement device according to claim 12, characterized by its features.

15. The aforementioned deck slab transport means consists of a transport vehicle that transports the deck slab and a transport trolley that transports the deck slab between the transport vehicle and the lifting device. The deck slab replacement device according to claim 12, characterized by its features.

16. The aforementioned floor slab is configured to be lifted and lowered, and is equipped with a gantry-type transfer device for transferring the floor slab between the transport trolley and the transport vehicle. The floor slab replacement device according to claim 15, characterized in that it is a feature of the device described in claim 15.

17. The aforementioned floor slab transport means consists of a transport vehicle equipped with a floor slab mounting platform and a lifting mechanism. The deck slab replacement device according to claim 12, characterized by its features.

18. The suspension device comprises an extension member that can extend in the bridge axis direction, a support member that supports the extension member, a gate-shaped frame to which the support member is fixed, and support legs that support the tip of the extension member from below, and the moving mechanism is provided on the extension member. The deck slab replacement device according to claim 12, characterized by its features.

19. The aforementioned gantry frame is formed to be expandable and contractible in the vertical and horizontal directions so that it can be transported by a transport vehicle. The deck slab replacement device according to claim 18, characterized by its features.

20. The support legs are rotatably mounted on the extension member. The deck slab replacement device according to claim 18, characterized by its features.

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