Installation method of newly-provided floor slab

Abstract

To improve the efficiency of work for installing a newly-provided concrete floor slab on a main girder of a bridge.SOLUTION: An installation method of a newly-provided floor slab comprises: a positioning step of arranging a newly-provided floor slab on a main girder of a bridge via a plurality of height adjusting blocks capable of supporting a heavy object, adjusting a height and a posture of the newly-provided floor slab in advance, and forming a filling space between the newly-provided floor slab and the main girder; a restraining step of restraining the newly-provided floor slab at the adjusted height and attitude; and a filling step of placing a filler in the filling space after the newly-provided floor slab is supported by the main girder via a floor slab support leg material penetrating the newly-provided floor slab instead of the height adjustment block.SELECTED DRAWING: Figure 7

Description

[Technical Field]

[0001] The present invention relates to a method for installing a new deck slab on the main girder of a bridge. [Background technology]

[0002] For example, to perform renovation work to replace an existing concrete deck installed on the main girders of a bridge with a new concrete deck, the existing concrete deck and the main girders must first be separated, and the existing concrete deck must be cut into a shape that can be loaded onto a transport vehicle. After this, the cut existing concrete deck is removed, and a surface treatment is performed to remove concrete debris, anchor reinforcement, rust, etc. remaining on the top surface of the main girders. After these steps are completed, the new concrete deck is installed on top of the prepared main girders.

[0003] One method for installing a new concrete deck on a main girder is to use support supports, as disclosed in Patent Document 1. Specifically, multiple support supports, such as square timbers, are placed at predetermined positions on the main girder, and then the concrete deck is placed on top of them, and shear stoppers are placed between the concrete deck and the main girder. This process is repeated in the bridge axis direction of the main girder to erect multiple concrete decks one after another, and then a filler is filled into the gaps between the concrete deck and the main girder formed by the support supports. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2022-139096 Summary of the Invention [Problem to be solved by the invention]

[0005] However, filling the gap between the concrete deck and the main girder requires positioning work to adjust the concrete deck to a predetermined height and posture according to the design of the road structure, thereby creating an appropriate filling space. However, adjusting the height and posture of the concrete deck while it is placed on the support is a complicated and time-consuming process.

[0006] While it is possible to fabricate the support members in advance in a shape that does not require adjustment, it would be difficult to fabricate all of the support members that support the concrete slab in this way. Furthermore, if they were fabricated in this way, the filler would have to be poured in the gap between the main girder and the concrete slab, which could interfere with the pouring of the filler.

[0007] The present invention has been made in consideration of such problems, and its main purpose is to improve the efficiency of the work of installing a new concrete deck slab on the main girders of a bridge. [Means for solving the problem]

[0008] In order to achieve this purpose, the deck installation method of the present invention is characterized by comprising a positioning process in which a new deck is placed on the main girders of a bridge via a plurality of height adjustment blocks capable of supporting heavy loads, and the height and posture of the new deck is adjusted in advance to form a filled space between the main girders; a restraining process in which the new deck is restrained at the adjusted height and posture; and a filling process in which the new deck is supported on the main girders via deck support legs that penetrate the new deck, instead of the height adjustment blocks, and then filler material is poured into the filled space.

[0009] The deck installation method of the present invention is characterized in that, in the restraint process, an upper surface position fixing device is provided on the upper surface side of the new deck, spanning between adjacent new decks, and a lower surface position fixing device is provided on the lower surface side of the new deck, between the main girder and the new deck.

[0010] The deck installation method of the present invention is characterized in that, in the filling step, after the filling material has hardened, the deck support leg material supporting the newly constructed deck is removed.

[0011] The deck installation method of the present invention is characterized in that after the restraint process and before the filling process, the deck erection machine used in the positioning process is moved onto the newly constructed deck.

[0012] The deck installation method of the present invention is characterized in that the filling process is carried out after the deck erection machine passes over the newly constructed deck.

[0013] According to the deck installation method of the present invention, in the positioning step, the new deck is placed on the main girder via height-adjustable blocks capable of supporting heavy loads. This allows the deck erection machine used in the positioning step to be placed on the new deck before filling the filling space with filler material, after the positioning and rotation of the new deck is restrained in the restraining step.

[0014] This allows the positioning process to proceed without waiting for the filling material to harden, as would be the case if the filling process were carried out first. The new deck can be placed in the next section adjacent to the section where the positioning and restraining processes were carried out using a deck erection machine. This allows the filling process, which takes the most time, to be removed from the critical path of the work process, increasing the flexibility of the construction plan and enabling an increase in the number of new decks laid per day. It also makes it possible to proceed with construction work without being affected by weather conditions.

[0015] Furthermore, while the new deck is being placed on the main girders using height-adjusting blocks, the new deck is adjusted in advance to a predetermined height and posture that corresponds to the design of the road structure, and an appropriate size filling space is created between the deck and the main girders. This eliminates the need to adjust the height and posture of the new deck during the filling process after the deck erection machine has passed, making the filling work more efficient.

[0016] Furthermore, before pouring the filler in the filling process, the new deck slab is supported via deck support legs that penetrate the new deck slab, and the height adjustment blocks are removed. This allows the filler to be distributed accurately throughout the filling space, preventing construction defects such as unfilled spaces caused by leaving the height adjustment blocks behind. Furthermore, if a filler adhesion inhibitor is applied to the deck support legs, the deck support legs can be removed from the new deck slab after the filler has hardened. [Effects of the Invention]

[0017] According to the present invention, height-adjustable blocks capable of supporting heavy loads are used to adjust the height and posture of the new deck slab in advance in addition to placing it on the main girders, thereby creating a filling space between the slab and the main girders, thereby making it possible to improve the efficiency of the work of installing a new concrete deck slab on the main girders of a bridge. [Brief explanation of the drawings]

[0018] [Figure 1] FIG. 2 is a diagram showing the flow of a construction method for installing a new deck in the present invention. [Figure 2] FIG. 1 is a diagram showing the procedure for installing a new deck slab in accordance with the present invention (part 1). [Figure 3] 1 is a diagram showing a support device and a deck support leg member according to the present invention. FIG. [Figure 4] FIG. 2 is a diagram showing a deck erection machine according to the present invention. [Figure 5] 10A and 10B are diagrams illustrating the operation of the deck erection machine according to the present invention. [Figure 6] FIG. 10 is a diagram showing the procedure for installing a new deck slab in the present invention (part 2). [Figure 7] 10A and 10B are diagrams showing an upper surface side position fixing device and a lower surface side position fixing device according to the present invention. [Figure 8] FIG. 10 is a diagram showing the procedure for installing a new deck slab in the present invention (part 3). [Figure 9] FIG. 4 is a diagram showing the procedure for installing a new deck slab in the present invention (part 4). DETAILED DESCRIPTION OF THE INVENTION

[0019] This invention relates to a construction method for installing a new concrete deck on the main girders of a bridge via a filler material such as mortar. In addition to the work of placing the new deck on the main girders, the new deck is adjusted in advance to a specified height and posture corresponding to the design of the road structure, and a filling space is formed between the main girders and the new deck.

[0020] This method can be used for both new bridge construction and deck replacement work on existing bridges, but in this embodiment, we will take half-section deck replacement work as an example of deck replacement work on an existing bridge, and explain the details with reference to Figures 1 to 9.

[0021] In addition, half-section deck replacement work is a method in which, for example, lane restrictions are implemented on a bridge with two uphill lanes, and the half-section of either the driving lane side or the passing lane side of the existing deck is replaced with a new deck, and around the same time, the half-section on the other side is also replaced with a new deck.

[0022] <<<<<New deck installation method>>>> The details of the installation method for the new deck slab will be explained with reference to the flow chart in Figure 1.

[0023] First, as shown in Figure 2(a), for the existing deck 1 on the main girder 2, the existing deck 1 of the preceding section is separated from the main girder 2 and removed. Then, a part of the main girder 2 is exposed where it was removed, so as shown in Figure 2(b), preparation is carried out on the top surface of the upper flange of this exposed main girder 2, and stud dowels S are installed.

[0024] <<<STEP 1 of the preceding section: Deck placement and positioning process>>> Next, as shown in Figure 2(c), a deck erection machine 100 is placed adjacent to the preceding section, rearward in the direction of construction progress (to the right of the page), and a new precast concrete deck 3 is placed on the upper flange of the main girder 2.

[0025] A plurality of new deck slabs 3 are arranged at intervals in the bridge axis direction, and each is supported by the main girder 2 via a height adjustment block 10, as shown in Figure 3(a). As shown in Figure 2(c), the new deck slab 3 has dowel through holes 31 into which the stud dowels S provided on the upper surface of the upper flange of the main girder 2 are inserted, and leg through holes 32 are formed nearby. Furthermore, deck slab support leg members 30 are attached to the leg through holes 32 in advance. These leg through holes 32 and deck slab support leg members 30 will be described later.

[0026] <Height adjustment block> The height adjustment block 10 employs a member capable of supporting a heavy object, capable of supporting not only the new deck slab 3 on the upper flange of the main girder 2 but also the deck erection machine 100 when it runs on the new deck slab 3. The height adjustment block 10 also has a function that allows the height position of the new deck slab 3 to be adjusted while it is placed on it.

[0027] Any structure is acceptable, but an example is a back-filled block such as a uniblock, which has an upper flat plate 11, a lower flat plate 12, and a height adjustment section 13 that adjusts the height position of the upper flat plate 11 relative to the lower flat plate 12, as shown in Figure 3(b).

[0028] It is preferable that such a height adjustment block 10 has a non-slip surface such as a rough surface or a rubber surface on the surfaces of the upper plate 11 and the lower plate 12. Furthermore, it is even more preferable if it has a function that allows the upper plate 11 to be tilted at a desired angle relative to the lower plate 12.

[0029] ≪Floor slab erection machine≫ Any deck erection machine 100 may be used as long as it has a structure that can lift the new deck slab 3 and place it at a desired position on the main girder 2. For example, a deck erection machine 100 as shown in Figure 4 can be used as an example.

[0030] As shown in Figures 4(a) and (b), the deck slab erection machine 100 comprises a lifting machine 101 that lifts the new deck slab 3, and a lateral rail 102 on which the lifting machine 101 is suspended so as to be freely movable. The lifting machine 101 not only lifts the new deck slab 3, but also has the function of being able to horizontally rotate the suspended new deck slab 3, as shown in Figures 5(a) and (b).

[0031] As shown in Figure 4(a), the traverse rail 102 is arranged to extend in the bridge axis direction, with its front side supported by a support frame 103. Its rear side is supported by a truss structure 104. In the space within the truss structure 104, as shown in Figure 4(b), a platform 105 for transporting the new deck slab 3 and equipment is placed.

[0032] As shown in Figures 4(a) and (b), the platform 105 is installed on the existing deck 1 adjacent to the preceding section, movably on platform rails 106 arranged in the bridge axis direction. The truss structure 104 is also installed movably on structure rails 107 arranged in the bridge axis direction.

[0033] The procedure for placing and positioning the new deck 3 on the main girder 2 using the height adjustment block 10 and deck erection machine 100 is as follows.

[0034] First, the new deck slab 3 placed on the platform 105 that constitutes the deck slab erection machine 100 is lifted by a crane 101 and moved above the main girder 2 in the preceding section, as shown in Figure 5(a). Simultaneously with or before or after these operations, a height adjustment block 10 is placed in a predetermined position on the main girder 2, as shown in Figure 5(b). The height adjustment block 10 is placed, for example, in a position where it can support the four corners of the new deck slab 3.

[0035] After this, the new deck slab 3 is aligned by rotating it as needed using the lifting machine 101 of the deck erection machine 100, and then it is lowered and placed on the height adjustment blocks 10. Alternatively, while it is supported by being suspended, the height adjustment units 13 of the height adjustment blocks 10 at the four corners are operated to position the new deck slab 3 so that it satisfies the design height and posture of the road structure.

[0036] In this way, the positioning work for the new deck slab 3 can be carried out in a state where the new deck slab 3 can be supported by the deck erection machine 100, thereby ensuring safety and improving work efficiency. Note that the height adjustment unit 13 of the height adjustment block 10 may be operated in advance to set it to the desired height before the new deck slab 3 is placed.

[0037] In this way, the height and posture of the new deck slab 3 are adjusted and positioned in advance while the new deck slab 3 is being placed on the main girder 2. This simultaneously forms a filling space A between the main girder 2 and the new deck slab 3 for pouring the filler material M in the filling process described below, as shown in Figure 3(a).

[0038] <<<STEP 1 of the preceding section: Restraint process for new deck slab>>> Using the above procedure, the required number of new deck slabs 3 are sequentially placed and positioned in the preceding section to form the filling space A, and then, or in parallel with these operations, positioning fixtures 20 are installed on the new deck slabs 3 as shown in Figure 6(a).

[0039] ≪Position fixing tool≫ Any type of position fixing device 20 may be used as long as it can restrain the new deck slab 3 positioned relative to the main girder 2 and prevent behavior that causes positional movement or rotation.

[0040] For example, Fig. 7(a) illustrates a first upper surface side position fixing device 21 and a second upper surface side position fixing device 22 that are installed on the upper surface side of the new deck slab 3, and a through hole position fixing device 24 that is installed in a dowel through hole 31. Fig. 7(b) illustrates a lower surface side position fixing device 23 that is installed on the lower surface side of the new deck slab 3.

[0041] 7(a), the first upper surface side position fixing device 21 includes a length adjusting device 211 and fasteners 212 such as bolts provided on both ends thereof. It is arranged across the existing deck slab 1 and the new deck slab 3, or across adjacent new deck slabs 3, and connects them via the fasteners 212.

[0042] This restricts the placement spacing of adjacent new deck slabs 3 in the bridge axis direction, preventing the new deck slabs 3 from moving in the bridge axis direction. In Figure 7(a), a turnbuckle is used as the length adjuster 211 of the first upper surface side position fixing device 21. However, any device may be used as long as it has the function of adjusting the length of the first upper surface side position fixing device 21.

[0043] 7(a), the second upper surface side position fixing device 22 comprises a rod 221 and a pair of locking devices 222 that lock the rod 221 to the existing deck slab 1 or the new deck slab 3. The locking devices 222 are installed on the existing deck slab 1 or the new deck slab 3, and the rod 221 extending in the bridge axis direction is locked to these, thereby locking both ends of the rod 221.

[0044] The second upper surface position fixing device 22 configured in this way can prevent the adjacent new deck slabs 3 from moving in a direction perpendicular to the bridge axis. In Figure 7(a), an ohm-type metal fitting is used for the locking device 222, and the rod 221 is passed through it to lock in place. However, any metal fitting may be used for the locking device 222 as long as it has a structure that can lock the rod 221 placed between the existing deck slab 1 and the new deck slab 3, or between two new deck slabs 3.

[0045] By installing the above-mentioned first upper surface position fixing device 21 and second upper surface position fixing device 22 across adjacent new deck slabs 3, it is possible to suppress positional movement and rotation between them in the direction of the bridge axis and perpendicular to the bridge axis.

[0046] As shown in Figure 7(b), the underside position fixing device 23 comprises a horizontal member 231 provided on the underside of the new deck slab 3, and a diagonal member 232 connected at one end to the horizontal member 231. The horizontal member 231 and the diagonal member 232 are both made of rod-shaped members, with the horizontal member 231 arranged to extend perpendicular to the bridge axis, and the diagonal member 232 arranged to connect the horizontal member 231 and the main girder 2.

[0047] The new deck slab 3 is generally placed on the main girder 2 in a position that is inclined in the direction perpendicular to the bridge axis (a position that ensures the cross gradient of the road). Therefore, by providing the above-mentioned lower surface position fixing device 23 on the underside of the new deck slab 3, the behavior of the combination of adjacent new deck slabs 3 on which the first upper surface position fixing device 21 and the second upper surface position fixing device 22 are installed, which tends to slide down in the direction perpendicular to the bridge axis, can be suppressed by the other end of the diagonal member 232 abutting against the main girder 2.

[0048] A plurality of lower surface side position fixing devices 23 configured in this manner are arranged in parallel in the bridge axis direction, and the other end of each diagonal member 232 is connected via a rod-shaped connecting member 233 extending parallel to the main girder 2. This makes it possible to prevent the combination of adjacent new deck slabs 3, on which the first upper surface side position fixing device 21 and the second upper surface side position fixing device 22 are installed, from rotating relative to the main girder 2 on the height adjustment block 10. Note that the other end of the diagonal member 232 may not only be in contact with the main girder 2, but may also be configured to be detachably fixed.

[0049] As described above, it is possible to restrain the new deck slab 3 at a position with adjusted height and posture using the first upper surface side position fixing device 21, the second upper surface side position fixing device 22 and the lower surface side position fixing device 23, but by using the through hole position fixing device 24 in combination, the new deck slab 3 can be restrained more reliably.

[0050] The through-hole position fixing device 24 can restrain the new deck slab 2 using the stud dowel S to prevent positional movement in the direction of the bridge axis and perpendicular to the bridge axis relative to the main girder 2, and any material and shape can be used as long as it can be removed from the dowel through-hole 31. For example, it is possible to use filler material or thickened squares, or it is also possible to use block material made to fit the shape of the dowel through-hole 31.

[0051] The positions at which the through-hole position fixing devices 24 are provided may be at all of the dowel through holes 31 provided in the new deck slab 3, or may be selected arbitrarily. Furthermore, when the through-hole position fixing devices 24 are installed, they are positioned so that they do not protrude below the new deck slab 3, i.e., into the filling space A. This makes it possible to prevent improper pouring of the filler M due to the through-hole position fixing devices 24 when pouring the filler M into the filling space A. The through-hole position fixing devices 24 may be used alone, instead of being used in combination with the first upper surface side position fixing device 21, the second upper surface side position fixing device 22, and the lower surface side position fixing device 23.

[0052] <<<STEP 1 of the preceding section: Moving and placing the deck erection machine>>> As described above, the positioning fixture 20 is used to restrain the new deck slab 3 at the height and posture positioned on the main girder 2 of the preceding section, and positional movement and rotation are suppressed.Then, the deck erection machine 100 is moved from the site adjacent to the preceding section and placed on the new deck slab 3 of the preceding section, as shown in Figure 6(b).

[0053] As explained with reference to Figure 3(a), the new deck slab 3 is supported on the main girder 2 via height adjustment blocks 10 that can withstand the load of the deck slab erection machine 100. Therefore, the deck slab erection machine 100 can be supported before the filling material M is poured into the filling space A formed between the main girder 2 and the new deck slab 3. To move the deck slab erection machine 100, platform rails 106 and structural rails 107 are laid on the new deck slab 3 in the preceding section, and the platform 105 and truss structure 04 are run along these rails.

[0054] <<<STEP 1 of the following section: Deck placement and positioning process>>> As described above, the deck erection machine 100 is moved and installed on the new deck slab 3 of the preceding section. This suspends work on at least the new deck slab 3 in the preceding section. Meanwhile, as shown in Figure 6(b), in the following section adjacent to the preceding section, the work of placing and positioning the new deck slab 3 on the main girders 2 is carried out using the height adjustment blocks 10 and the deck erection machine 100. The work procedure is the same as that of the preceding section described above.

[0055] <<<STEP 1 of the following section: Restraining process for new deck slabs>>> Similar to the construction procedure for the preceding section, the required number of new deck slabs 3 are sequentially placed and positioned in the following section to form a filling space A between the main girders 2, and then, or in parallel with these operations, positioning fixtures 20 are installed on the new deck slabs 3 as shown in Figure 6(c). In this way, the positioning fixtures 20 are used to restrain the new deck slab 3 that has been positioned on the main girders 2 of the following section, suppressing positional movement and rotation.

[0056] <<<<Step 1 of the Trailing Section: Movement of the Deck Erection Machine and Positioning of the Trailing Section>>>> After this, as shown in Figure 8(a), the deck slab erection machine 100 in the leading section is moved and placed on the new deck slab 3 in the following section. Then, using this deck slab erection machine 100, the work of STEP 1 described above is started in the next section adjacent to the following section. As a result, work on at least the new deck slab 3 in the following section is suspended.

[0057] <<<STEP 2 of the preceding section: Replacing the new deck>>> On the other hand, in the preceding section after the deck erection machine 100 has moved, work to install the new deck slab 3 on the main girder 2 is resumed.

[0058] First, as shown in Figure 8(b), the height adjustment blocks 10 are removed and the new deck slab 3 is supported by the deck support legs 30. In the preceding section, the new deck slab 3 has already been positioned, and a filling space A has been formed between the main girder 2 and the new deck slab 3. Therefore, there is no need to adjust the height or posture of the new deck slab 3.

[0059] ≪Floor slab support leg material 30≫ The deck support leg member 30 can be freely inserted and removed from the top surface side of the new deck slab 3, and any member that can support the new deck slab 3 can be used.

[0060] For example, Figure 3(c) shows an example in which a height adjustment bolt, which is widely used for new deck slabs 3 and is used to adjust the height of the new deck slab 3 after it has been placed on the main girder 2, is used, and an insert nut that screws onto this height adjustment bolt is provided in the leg through hole 32. It is advisable to coat at least the part of the deck support leg 30 that is exposed to the filling space A with an anti-adhesion agent 301 for the filling material M.

[0061] Figure 8(a) shows an example of a case where deck slab support leg members 30 of this structure are installed in four locations in a plan view of the new deck slab 3. As shown in Figure 3(c), the deck slab support leg members 30 attached to leg member through holes 32 provided in the new deck slab 3 are screwed from the top side of the new deck slab 3 toward the main girder 2 and abut against the upper flange of the main girder 2, thereby supporting the new deck slab 3. In this state, the height adjustment block 10 is removed as shown in Figure 8(b).

[0062] <<<Step 2 of the preceding section: Filling process of the preceding section>>> After the new deck slab 3 is supported by the deck support leg 30 instead of the height adjustment block 10, filling material M is filled into the filling space A formed between the upper flange of the main girder 2 and the new deck slab 3, as shown in Figures 9(a) and (b).

[0063] Since the height adjustment blocks 10 are not left in the filling space A, the filling material M can be distributed accurately, and construction defects such as the creation of unfilled spaces can be prevented. The filling material M can be, for example, a non-shrinking mortar material that is generally used to fill the gap between a newly constructed concrete deck slab and a steel main girder 2.

[0064] <<STEP 2 of the preceding section: Pulling out the deck height adjustment blocks of the preceding section>> After the filler M has hardened, as shown in FIG. 9(c), the deck support leg 30 is removed from the upper surface side of the new deck slab 3, and the installation work of the new deck slab 3 on the main girder 2 is completed.

[0065] While the work of STEP 2 is being carried out in the preceding section, in the next section adjacent to the following section, work similar to that of STEP 1 carried out in the preceding and following sections is being carried out using the deck slab erection machine 100 placed in the following section. After the work of STEP 1 in the next section is completed, the deck slab erection machine 100 placed in the following section is moved and placed on the new deck slab 3 in the next section.

[0066] In this way, after the deck erection machine 100 passes over the new deck slab 3 in the following section, the same work as in STEP 2 carried out in the preceding section is carried out in the following section. In this way, by sequentially carrying out the work in STEP 1 and STEP 2 for each section set in the bridge axis direction, the new deck slab 3 is installed on the main girder 2 in the bridge axis direction.

[0067] As described above, according to the new deck installation method, after the restraint process is performed in the preceding section, the deck erection machine 100 used in the placement and positioning process of the new deck slab 3 can be placed on the new deck slab 3 in the preceding section before the filling process is performed in which the filler material M is poured into the filling space A. This allows the deck erection machine 100 to be used to place the new deck slab 3 in the following section adjacent to the preceding section, and the positioning process to proceed, without having to wait for the filler material M to harden, as is the case when the filling process is performed first.

[0068] In this way, the filling process, which takes the most time, can be removed from the critical path of the work process, which increases the flexibility of the construction plan and makes it possible to increase the number of new deck slabs 3 laid per day. It also makes it possible to proceed with the construction work without being affected by the weather.

[0069] Furthermore, in conjunction with the work of placing the new deck slab 3 on the main girder 2, the height adjustment blocks 10 are used to position the new deck slab 3 in advance by adjusting its height and posture to correspond to the design of the road structure, and a filling space A is formed between the main girder 2. As a result, in the filling process carried out in the preceding section after the deck erection machine 100 has passed, the work of forming the filling space A between the main girder 2 and the new deck slab 3 can be omitted, and the work efficiency in the filling process can be improved.

[0070] Furthermore, before pouring the filler material M in the filling process, the new slab 3 is supported via the slab support leg members 30 that penetrate the new slab 3, and the height adjustment blocks 10 are removed. This allows the filler material M to be distributed accurately throughout the filling space A, and prevents construction defects such as the creation of unfilled spaces due to the height adjustment blocks 10 being left behind. Also, if an anti-adhesion agent for the filler material M is applied to the slab support leg members 30, it becomes possible to pull out and remove the slab support leg members 30 from above the new slab 3 after the filler material M has hardened.

[0071] The method for installing a new deck slab of the present invention is not limited to the above-described embodiment, and various modifications are possible within the scope of the present invention.

[0072] For example, in this embodiment, six new deck slabs 3 are installed in the preceding section, but the number is not limited thereto. The filling process may be carried out for each section, or may be carried out simultaneously in the preceding and following sections, for example. [Explanation of symbols]

[0073] 1 Existing deck 2 Main digit 3 New deck 31 Dowel through hole 32 Through hole for leg material 10 Height adjustment block 11 Upper plate 12 Lower plate 13 Height adjustment unit 20 Position fixture 21 1st top side positioning fixture 211 Length adjuster 212 Fasteners 22 2nd top side positioning fixture 221 Bar material 222 Locking device 23 Bottom side positioning fixture 231 Cross member 232 Diagonal members 233 Connecting material 24 Position fixing device for through hole 30 Floor slab support leg material 301 Anti-adhesion agents 100 Floor slab erection machine 101 Lifting Machine 102 Traverse rail 103 Support Frame 104 Truss Structure 105 Mounting stand 106 Mounting rail 107 Structural Rails S stud dowel M Filler A filling space

Claims

1. a positioning process in which a new deck slab is placed on the main girder of the bridge via a plurality of height adjustment blocks capable of supporting heavy loads, and the height and posture of the new deck slab are adjusted in advance to form a filling space between the new deck slab and the main girder; A restraining step of restraining the new deck slab at the adjusted height and posture; A filling process in which the new deck slab is supported on the main girder via deck support leg members that penetrate the new deck slab instead of the height adjustment blocks, and then a filling material is poured into the filling space; A method for installing a new deck, characterized by comprising:

2. In the installation method of a new deck according to claim 1, A method for installing a new deck, characterized in that in the restraint process, an upper surface position fixing device is provided on the upper surface side of the new deck, spanning between the adjacent new decks, and a lower surface position fixing device is provided on the lower surface side of the new deck, between the main girder and the new deck.

3. In the installation method of a new deck according to claim 1, A method for installing a new deck, characterized in that, after the filling material has hardened in the filling step, the deck support leg material supporting the new deck is removed.

4. In the installation method of a new deck according to claim 1, A method for installing a new deck, characterized in that after the restraint process and before the filling process, the deck erection machine used in the positioning process is moved onto the new deck.

5. The method for installing a new deck according to claim 4, A method for installing a new deck, characterized in that the filling process is carried out after the deck erection machine passes over the new deck.

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