JP7499735B2 - Deck installation structure and deck installation method - Google Patents

Description

The present invention relates to a deck installation structure and a deck installation method.

In widening and repair works, etc., a technique has been proposed for connecting a deck installed on a bridge girder to another deck installed on another bridge girder that is separated from the first girder in a direction intersecting the bridge axis direction. For example, Patent Document 1 discloses a technique for replacing decks by dividing an existing deck installed on multiple bridge girders adjacent in the direction perpendicular to the bridge axis into a primary construction section and a secondary construction section in the direction perpendicular to the bridge axis.

In the technology of Patent Document 1, the existing deck slab of the secondary construction section is used as a road, while the existing deck slab of the primary construction section is removed, and a new deck slab made of precast concrete is erected on the removed primary construction section. The new deck slab of the primary construction section is used as a road, while the existing deck slab of the secondary construction section is removed, and a new deck slab made of precast concrete is erected on the removed secondary construction section. A tensioning material is inserted into the through hole that connects the new deck slab of the primary construction section and the new deck slab of the secondary construction section. By tensioning the tensioning material, tension is applied to the deck slab of the primary construction section and the deck slab of the secondary construction section, and the deck slab of the primary construction section and the deck slab of the secondary construction section are joined together.

JP 2015-151768 A

In the above technology, the two decks are installed on separate bridge girders and are adjacent in the direction perpendicular to the bridge axis. After tension is applied to the two decks by the tendons, the decks of the primary construction section and the secondary construction section are joined together. However, before tension is applied to the two decks by the tendons, one of the decks is in use as a road and the load caused by vehicles passing over it is applied only to one of the decks, but the two decks are not connected.

As a result, while tension is applied to the two decks by the tension members and before the two decks are joined together, one of the decks may move due to the load caused by passing vehicles, and relative displacement may occur between the two decks due to vibrations caused by the repeated fluctuating loads, which may result in damage to the opposing surfaces of each deck.

The present invention aims to provide a deck installation structure and deck installation method that can connect decks before tension is applied by the tendons.

The present invention is a deck installation structure that connects a first deck installed on a first bridge girder and a second deck installed on a second bridge girder that is spaced apart from the first bridge girder in a direction intersecting the bridge axis direction, and includes a lower abutment member that abuts across the first lower surface of the first deck and the second lower surface of the second deck, an upper abutment member that abuts across the first upper surface of the first deck and the second upper surface of the second deck, a fastening member that fastens the lower abutment member and the upper abutment member, and a tension member insertion hole that connects the first deck and the second deck and through which a tension member that applies tension to the first deck and the second deck is inserted.

According to this configuration, in a deck installation structure that connects a first deck installed on a first bridge girder and a second deck installed on a second bridge girder that is spaced apart from the first deck in a direction intersecting the bridge axis direction, the lower abutment member abuts across the first lower surface of the first deck and the second lower surface of the second deck, the upper abutment member abuts across the first upper surface of the first deck and the second upper surface of the second deck, and the fastening member fastens the lower abutment member and the upper abutment member, so that a tensioning material is inserted into the tensioning material insertion hole that connects the first deck and the second deck, and the first deck and the second deck can be connected before tension is applied by the tensioning material.

In this case, the first deck has a first hole portion penetrating from the first lower surface to the first upper surface, and the fastening member may be inserted into the first hole portion and extend across the lower abutment member and the upper abutment member.

According to this configuration, the fastening member is inserted into the first hole that penetrates from the first lower surface to the first upper surface of the first deck and extends across the lower contact member and the upper contact member. Therefore, when multiple first decks are installed at intervals from each other along the bridge axis direction on the first bridge girder and the gaps between the multiple first decks are filled with filler, the fastening member is unlikely to hinder the filling of the filler.

The first deck may also have a first bridge axis direction surface facing the bridge axis direction, and the fastening member may extend across the lower abutment member and the upper abutment member on the outside of the first bridge axis direction surface.

According to this configuration, the fastening member extends across the lower contact member and the upper contact member on the outside of the first bridge axis direction surface facing the bridge axis direction of the first deck, so that the fastening member can be easily installed and removed. In addition, even if the first deck does not have a hole that penetrates from the first lower surface to the first upper surface, the fastening member can be installed and removed, so that the installation and removal of the fastening member becomes even easier.

The first deck has a first opposing surface facing the second bridge girder side, and the second deck has a second opposing surface facing the first bridge girder side, the first opposing surface and the second opposing surface facing each other across a gap, and the fastening member may be disposed in the gap and extend across the lower abutment member and the upper abutment member.

According to this configuration, the first deck has a first opposing surface facing the second bridge girder side, and the second deck has a second opposing surface facing the first bridge girder side, the first opposing surface and the second opposing surface facing each other across a gap, and the fastening member is disposed in the gap and extends across the lower contact member and the upper contact member, so that the fastening member can be easily installed and removed. In addition, even if the first deck does not have a hole that penetrates from the first lower surface to the first upper surface, the fastening member can be installed and removed, making it even easier to install and remove the fastening member.

The lower contact member or the upper contact member may also have a recess that is recessed across the first and second floor slabs.

With this configuration, the lower contact member or the upper contact member has a recess that spans the first and second decks, making it easier to accommodate fluctuations in the angle between the first and second decks due to vibrations, construction errors, etc.

The present invention also relates to a method for erecting decks that connects a first deck installed on a first bridge girder and a second deck installed on a second bridge girder that is spaced apart from the first bridge girder in a direction intersecting the bridge axis direction, the method including a first deck installation step of installing the first deck on the first bridge girder, a second deck installation step of installing the second deck on the second bridge girder, a lower abutment step of abutting a lower abutment member across a first underside of the first deck installed in the first deck installation step and a second underside of the second deck installed in the second deck installation step, and a first upper side of the first deck installed in the first deck installation step and a second upper side of the second deck installed in the second deck installation step. This method of erecting decks includes an upper abutment process in which the upper abutment member is abutted across the first and second lower surfaces of the first and second decks, a fastening process in which the lower abutment member abutted across the first and second lower surfaces in the lower abutment process and the upper abutment member abutted across the first and second upper surfaces in the upper abutment process are fastened with fastening members, a tensioning process in which, after the fastening process, a tensioning member is inserted into a tensioning member insertion hole portion that connects the first and second decks and tension is applied to the first and second decks by the tensioning member, and a removal process in which, after the tensioning process, the lower abutment member, the upper abutment member, and the fastening member are removed.

According to this configuration, after the tensioning process, the lower contact member, the upper contact member, and the fastening member are removed in the removal process, so that the lower contact member, the upper contact member, and the fastening member that are no longer needed after the tensioning process can be prevented from becoming an obstacle to subsequent construction.

In this case, the first slab installation process further includes a step of installing a plurality of first slabs at intervals from one another on the first bridge girder along the bridge axis direction, and filling the gaps between the plurality of first slabs installed in the first slab installation process with a filling material; the second slab installation process further includes a step of installing a second slab adjacent to any of the first slabs installed in the first slab installation process, and a step of abutting the first underside of any of the first slabs installed in the first slab installation process and the second slab installed in the second slab installation process. In the upper abutment step, the lower abutment member is abutted across the first upper surface of any of the first floor slabs installed in the first floor slab installation step and the second upper surface of the second floor slab installed in the second floor slab installation step, and in the tensioning step, a tensioning material is inserted into a tensioning material insertion hole portion that connects any of the first floor slabs installed in the first floor slab installation step and the second floor slab installed in the second floor slab installation step, and tension is applied to the first and second floor slabs.

According to this configuration, in the first deck installation process, multiple first decks are installed on the first bridge girder at intervals along the bridge axis direction, and the gaps between the multiple first decks installed in the first deck installation process are filled with filler material by the gap filling process, so that the first deck can be used as a road. In addition, in the second deck installation process, a second deck is installed adjacent to any of the first decks installed in the first deck installation process, and the adjacent first and second decks can be connected to each other by the lower abutment process, upper abutment process, and fastening process before tension is applied by the tensioning material in the tensioning process.

In addition, in the fastening process, the lower abutment member and the upper abutment member may be fastened together by a fastening member that is inserted into a first hole that penetrates from the first lower surface to the first upper surface of the first deck and extends across the lower abutment member and the upper abutment member.

In addition, in the fastening process, the lower abutment member and the upper abutment member may be fastened together by a fastening member extending across the lower abutment member and the upper abutment member on the outside of the first bridge axis direction surface facing the bridge axis direction of the first deck slab.

In addition, in the fastening process, the lower abutment member and the upper abutment member may be fastened together by a fastening member that is disposed in the gap between a first opposing surface facing the second bridge girder side of the first deck slab and a second opposing surface facing the first bridge girder side of the second deck slab and that extends across the lower abutment member and the upper abutment member.

The lower contact member or the upper contact member may also have a recess that is recessed across the first and second floor slabs.

The deck installation structure and deck installation method of the present invention allow the decks to be connected before tension is applied by the tendons.

FIG. 1A is a plan view of a road bridge to which the deck erection method according to the first embodiment is applied, and FIG. 1B is a longitudinal cross-sectional view taken along line α of FIG. 1A is a plan view showing the process of cutting the existing deck above the first bridge girder while using the existing deck above the second bridge girder as a road in the deck erection method of the first embodiment, and FIG. 1B is a longitudinal cross-sectional view taken along the β line of (A). 1A is a plan view showing the process of removing the existing deck above the first bridge girder in the deck erection method according to the first embodiment, and FIG. 1B is a longitudinal cross-sectional view of (A) taken by gamma rays. (A) is a plan view showing the first deck installation step in the deck installation method of the first embodiment, (B) is a longitudinal cross-sectional view taken along line δ of (A), and (C) is an oblique view showing the deck installation jig of the first embodiment in the states of (A) and (B). 1A is a plan view showing a filling process in a deck installation method according to the first embodiment, and FIG. 1B is a vertical cross-sectional view taken along line δ of FIG. 1A and a vertical cross-sectional view taken along line ε of FIG. 1A is a plan view showing the process of cutting the existing deck above the second bridge girder while continuing to use the existing deck above the first bridge girder as a road in the deck erection method of the first embodiment, and FIG. 1B is a longitudinal cross-sectional view taken along line ζ of (A). (A) is a plan view showing the process of removing the existing deck above the second bridge girder in the deck installation method of the first embodiment, (B) is a longitudinal cross-sectional view along the η line of (A), and (C) is an oblique view showing the deck installation jig of the first embodiment in the states of (A) and (B). 1A is a plan view showing the second deck installation process and the lower abutment process in the deck installation method according to the first embodiment, and FIG. 1B is a longitudinal cross-sectional view taken along line θ of FIG. (A) is a plan view showing the upper abutment process and fastening process in the deck installation method of the first embodiment, and the deck installation structure of the first embodiment, (B) is a longitudinal cross-sectional view taken along line i of (A), and (C) is an oblique view showing the deck installation jig of the first embodiment in the states of (A) and (B). FIG. 1A is a plan view showing a tensioning process in a deck erection method according to the first embodiment, and FIG. 1B is a vertical cross-sectional view taken along line κ of FIG. 1A is a plan view showing a removal process in the deck installation method according to the first embodiment, and FIG. 1B is a vertical cross-sectional view taken along line λ of FIG. FIG. 1A is a plan view showing the state in which replacement of the deck has been completed in the deck installation method according to the first embodiment, and FIG. 1B is a vertical cross-sectional view taken along line μ in FIG. (A) is a plan view showing the first deck installation step in the deck installation method of the second embodiment, (B) is a longitudinal cross-sectional view along line v of (A), and (C) is an oblique view showing the deck installation jig of the second embodiment in the states of (A) and (B). (A) is a plan view showing the process of removing the existing deck above the second bridge girder in the deck installation method of the second embodiment, (B) is a longitudinal cross-sectional view along the ξ line of (A), and (C) is an oblique view showing the deck installation jig of the second embodiment in the states of (A) and (B). (A) is a plan view showing the upper abutment process and fastening process in the deck installation method of the second embodiment, and the deck installation structure of the second embodiment, (B) is a longitudinal cross-sectional view taken along line ο of (A), and (C) is an oblique view showing the deck installation jig of the second embodiment in the states of (A) and (B). (A) is a longitudinal cross-sectional view showing the deck installation structure relating to the third embodiment, (B) is a longitudinal cross-sectional view showing the deck installation structure relating to the fourth embodiment, and (C) is an oblique view showing the deck installation structure relating to the fifth embodiment. 13A is a plan view showing the upper abutment process, fastening process and fastening process in the deck installation method of the sixth embodiment, as well as the deck installation structure of the sixth embodiment, (B) is a longitudinal cross-sectional view taken along the pi line of (A), and (C) is an enlarged view of (B). (A) is a plan view showing the tensioning process after the gap is filled with the filler solidified material in the deck installation method of the sixth embodiment, (B) is a longitudinal cross-sectional view taken along the ρ line of (A), and (C) is an enlarged view of (B). 13A is a plan view showing the removal process in the deck installation method of the sixth embodiment, (B) is a longitudinal cross-sectional view taken along the σ line of (A), and (C) is an enlarged view of (B). FIG.

The following describes in detail the deck installation structure and deck installation method according to the present invention with reference to the drawings. The deck installation structure and deck installation method according to the first embodiment of the present invention are for connecting a first deck newly installed on the first bridge girder 21 and a second deck newly installed on the second bridge girder 22 when replacing an existing deck 100 installed on a first bridge girder 21 and a second bridge girder 22 that is separated from the first bridge girder 21 in the bridge axis perpendicular direction D2 that intersects with the bridge axis direction D1, as shown in Figures 1(A) and 1(B). Wall balustrades 61 and 62 are installed on both ends of the existing deck 100 in the bridge axis perpendicular direction D2. In the example of Figures 1(A) and 1(B), the existing deck 100 is used as a two-lane road on one side.

As shown in Figures 2(A) and 2(B), the existing deck 100 is divided into two existing decks 101 and 102 in the direction D2 perpendicular to the bridge axis. A temporary protective fence 82 is installed on the end of the existing deck 102 opposite the wall parapet 62. The existing deck 102 is used as a road with one lane in each direction. Traffic is closed on the existing deck 101, and the wall parapet 61 is removed. The existing deck 101 is separated from the existing deck 102 in the direction D2 perpendicular to the bridge axis at a cut surface along the bridge axis direction D1. The existing deck 101 is separated in the bridge axis direction D1 at a cut surface along the bridge axis direction D2 so that the dimensions are suitable for removal. As shown in Figures 3(A) and 3(B), the existing deck 101 is removed from the first bridge girder 21 while the existing deck 102 remains in service as a one-lane road.

As shown in Fig. 4(A) and Fig. 4(B), while the existing deck 102 is used as a road with one lane on each side, a first deck installation process is performed to install a first deck 30A formed of precast concrete on the first bridge girder 21. The first deck 30A has a first lower surface 31 and a first upper surface 32. The first deck 30A has a first tension member insertion hole portion 33 through which a tension member that applies tension to the first deck 30A is inserted, communicating with the first deck 30A in the direction perpendicular to the bridge axis D2. The first deck 30A has a first bridge axis direction surface 35 facing the bridge axis direction D1. In the first deck installation process, a plurality of first decks 30A are installed on the first bridge girder 21 along the bridge axis direction D1 with a gap 30g between the first bridge axis direction surfaces 35. The first deck 30A has a first opposing surface 36 that faces the second bridge girder 22 side of the first deck 30A. Immediately after the first deck installation process, the first opposing surface 36 faces the existing deck 102.

As shown in Figures 4(A), 4(B) and 4(C), the first floor slab 30A has two first holes 34 that penetrate from the first lower surface 31 to the first upper surface 32 near the first opposing surface 36. Before the first floor slab installation process is performed, an installation jig 10A is attached to each of the first holes 34 of the first floor slab 30A. The installation jig 10A has a lower abutment member 11A that abuts against the first lower surface 31 of the first floor slab 30A, an upper abutment member 12A that abuts against the first upper surface 32 of the first floor slab 30A, and a fastening member 13A that fastens the lower abutment member 11A and the upper abutment member 12A. Note that fastening means to tighten and tie.

The lower contact member 11A and the upper contact member 12A are rectangular members formed from steel plates such as SM490. The lower contact member 11A and the upper contact member 12A each include a pair of bolt holes 11h, 12h spaced apart in the longitudinal direction. For the convenience of adjusting the installation positions of the lower contact member 11A and the upper contact member 12A, the inner diameters of the bolt holes 11h, 12h in the longitudinal direction are larger than the inner diameters of the lower contact member 11A and the upper contact member 12A in the lateral direction.

The fastening member 13A includes a bolt 13b and a nut 13n. The bolt 13b of the fastening member 13A is inserted through the first hole portion 34 and one of the pair of bolt holes 11h, 12h, and extends across the lower part of the lower abutment member 11A and the upper part of the upper abutment member 12A. The nut 13n is screwed onto the upper and lower ends of the bolt 13b, so that the lower abutment member 11A and the upper abutment member 12A are fastened together while the first floor slab 30A is sandwiched between the lower abutment member 11A and the upper abutment member 12A.

Immediately after the first floor slab installation process, in a provisional upper abutment process, the upper abutment member 12A is abutted against the first upper surface 32 so that the entire upper abutment member 12A is positioned inside the first opposing surface 36 of the first floor slab 30A installed in the first floor slab installation process so as not to impede the removal of the existing floor slab 102 and the installation of the second floor slab. Also, in order not to impede the removal of the existing floor slab 102 and the installation of the second floor slab, the lower abutment member 11A is abutted against the first lower surface 31 so that the entire lower abutment member 11A is positioned inside the first opposing surface 36.

As shown in Figures 5(A) and 5(B), a filling process is performed to fill the gaps 30g between the multiple first decks 30A installed in the first deck installation process with filler material 30f. For convenience of subsequent work, the gaps 30g near the installation jig 10A do not need to be filled with filler material 30f. In other words, an unfilled area 30n is provided in the gaps 30g between the multiple first decks 30A, where the filler material 30f is not filled in part. For example, the unfilled area 30n where the filler material 30f is not filled in part is a predetermined range from the first opposing surface 36.

As shown in Figures 6(A) and 6(B), after the filling material 30f filled in the filling process hardens, a wall balustrade 71 is installed on the end of the first slab 30A opposite the existing slab 102. A temporary protective fence 81 is installed on the end of the first slab on the side of the existing slab 102. The temporary protective fence 81 is installed at a position away from the erection jig 10A on the wall balustrade 71 side for the convenience of subsequent work. The first slab 30A is used as a one-lane road on one side. Traffic is closed on the existing slab 102, and the wall balustrade 61 and temporary protective fence 82 are removed. The existing slab 102 is separated in the bridge axis direction D1 at a cut surface along the direction perpendicular to the bridge axis D2 so that the dimensions are suitable for removal.

As shown in Figures 7(A) and 7(B), the existing deck 102 is removed from the second bridge girder 22 while the first deck 30A is used as a road with one lane in each direction. As shown in Figures 7(A), 7(B), and 7(C), after the existing deck 102 is removed from the second bridge girder 22 and before the second deck installation process described below, the lower abutment member 11A is abutted against the first lower surface 31 as a temporary lower abutment process so that a part of the lower abutment member 11A protrudes outward from the first opposing surface 36 that faces the second bridge girder 22 side of the first deck 30A installed in the first deck installation process.

The above-mentioned temporary lower abutment process can be performed by slightly loosening the screwing of the nut 13n onto the bolt 13b of the fastening member 13A. After the temporary lower abutment process is completed and before the second deck installation process described below, the nut 13n is screwed onto the bolt 13b again as a temporary fastening process, whereby the lower abutment member 11A that was abutted against the first lower surface 31 in the temporary lower abutment process and the upper abutment member 12A that was abutted against the first upper surface 32 in the temporary upper abutment process are fastened by the fastening member 13A.

As shown in Figures 8(A) and 8(B), while the first deck 30A is used as a road with one lane in each direction, a second deck installation process is carried out in which a second deck 40A made of precast concrete is installed on the second bridge girder 22. In the second deck installation process, the second deck 40A is installed adjacent to one of the first decks 30A installed in the first deck installation process.

The second deck 40A has a second lower surface 41 and a second upper surface 42. The second deck 40A has a second tension member insertion hole 43 through which a tension member that applies tension to the second deck 40A is inserted, and which communicates with the second deck 40A in the direction perpendicular to the bridge axis D2. The position of the first tension member insertion hole 33 of the first deck 30A corresponds to the position of the second tension member insertion hole 43 of the second deck, and the first tension member insertion hole 33 and the second tension member insertion hole 43 function as a tension member insertion hole 50 through which a tension member that applies tension to the first deck 30A and the second deck 40A is inserted, which communicates with the first deck 30A and the second deck 40A.

The second deck 40A has a second bridge axis direction surface 45 facing the bridge axis direction D1. In the second deck installation process, a plurality of second decks 40A are installed on the second bridge girder 22 along the bridge axis direction D1 with a gap 40g between the second bridge axis direction surfaces 45. The second deck 40A has a second opposing surface 46 facing the first bridge girder 21 side of the second deck 40. Immediately after the second deck installation process, the second opposing surfaces 46 of the second deck 40A face the first opposing surfaces 36 of the first deck 30A installed in the first deck installation process.

During the second floor slab installation process, a lower abutment process is performed in which the lower abutment member 11A is abutted across the first lower surface 31 of any one of the first floor slabs 30A installed in the first floor slab installation process and the second lower surface 41 of the second floor slab 40A installed in the second floor slab installation process. In other words, in the second floor slab installation process, the second floor slab 40A is installed while the second lower surface 41 is abutted against the lower abutment member 11A, a part of which protrudes outside the first opposing surface 36, so that the lower abutment process is performed together with the second floor slab installation process. The second floor slab 40A has two second hole portions 44 that penetrate from the second lower surface 41 to the second upper surface 42 near the second opposing surface 46. The positions of the second hole portions 44 correspond to the positions of the other bolt hole portion 11h through which the bolt 13b of the lower abutment member 11A is not inserted after the lower abutment process.

As shown in Figures 9(A), 9(B) and 9(C), while the first deck 30A is used as a one-lane road, after the second deck installation process and the lower abutment process, the upper abutment member 12A is moved so that a part of the upper abutment member 12A protrudes outside the first opposing surface 36, and the upper abutment process is performed in which the upper abutment member 12A abuts across the first upper surface 32 of any one of the first decks 30A installed in the first deck installation process and the second upper surface 42 of the second deck 40A installed in the second deck installation process. The upper abutment process can be performed by slightly loosening the screwing of the nut 13n to the bolt 13b of the fastening member 13A. The positions of the second holes 44 correspond to the positions of the other bolt hole portion 12h into which the bolt 13b of the upper abutment member 12A is not inserted after the upper abutment process.

After the upper abutment process, a fastening process is performed in which the lower abutment member 11A, which has been abutted across the first lower surface 31 and the second lower surface 41 in the lower abutment process, and the upper abutment member 12A, which has been abutted across the first upper surface 32 and the second upper surface 42 in the upper abutment process, are fastened by the fastening member 13A. In the fastening process, the first floor slab 30A and the second floor slab 40A are sandwiched between the lower abutment member 11A and the upper abutment member 12A by the fastening member 13A, which is inserted into the first hole portion 34 penetrating from the first lower surface 31 to the first upper surface 32 of the first floor slab 30A and extends across the lower abutment member 11A and the upper abutment member 12A. In the fastening process, the nut 13n is screwed again onto the bolt 13b inserted into the first hole 34 of the first deck 30A. By fastening the lower contact member 11A and the upper contact member 12A with the fastening member 13A, the relative vertical displacement of the first deck 30A and the second deck 40A is suppressed even when the first deck 30A is used as a one-lane road and heavy vehicles are running on it.

In the fastening process, the bolt 13b of the other fastening member 13A is inserted into the second hole 44 of the second floor 40A and the other of the pair of bolt holes 11h, 12h, and is extended across the lower part of the lower abutment member 11A and the upper part of the upper abutment member 12A. The nut 13n is screwed onto the upper and lower ends of the bolt 13b inserted into the second hole 44, so that the lower abutment member 11A and the upper abutment member 12A are fastened while the first floor 30A and the second floor 40A are sandwiched between the lower abutment member 11A and the upper abutment member 12A. After the fastening process, it is preferable that the outer peripheral surface of the bolt 13b and the inner wall surfaces of the first hole 34 and the second hole 44 are not in contact with each other and have a gap of about several mm. The first hole 34 and second hole 44 through which the bolt 13b is inserted are larger than the outer diameter of the bolt 13b, and the bolt 13b does not come into contact with the first hole and second hole, preventing damage due to relative displacement.

After the fastening process, a deck installation structure 1A is formed, which includes a lower abutment member 11A that abuts across the first lower surface 31 of the first deck 30A and the second lower surface 41 of the second deck 40A, an upper abutment member 12A that abuts across the first upper surface 32 of the first deck 30A and the second upper surface 42 of the second deck 40A, a fastening member 13A that fastens the lower abutment member 11A and the upper abutment member 12A, and a tension member insertion hole portion 50 that connects the first deck 30A and the second deck 40A and through which a tension member is inserted to apply tension to the first deck 30A and the second deck 40A. The first floor slab 30A has a first hole 34 that penetrates from the first lower surface 31 to the first upper surface 32, and the second floor slab 40A has a second hole 44 that penetrates from the second lower surface 41 to the second upper surface 42, and each of the fastening members 13A is inserted through the first hole 34 and the second hole 44 and extends across the lower contact member 11A and the upper contact member 12A.

The design concept of the erection structure 1A of this embodiment will be described below. For the deviation caused by the difference in deflection in the main girder span direction of the bridge axis direction D1, it is necessary to arrange the lower contact member 11A and the upper contact member 12A, which are steel plates equivalent to the shear strength of the first floor slab 30A and the second floor slab 40A, which are concrete floor slabs. For example, assuming that the first opposing surface 36 and the second opposing surface 46 of the first floor slab 30A and the second floor slab 40A are 2000 mm wide and 220 mm thick, and the shear stress intensity of the concrete is 0.32 N/mm ² , the shear strength of the concrete floor slab is 2000 mm x 220 mm x 0.32 N/mm ² = 140800 N. In addition, the first opposing surface 36 and the second opposing surface 46 of the first floor slab 30A and the second floor slab 40A are in surface contact with each other.

On the other hand, the lower contact member 11A and the upper contact member 12A are arranged as four steel plates for each pair of the first opposing surface 36 and the second opposing surface 46. Assuming that the lower contact member 11A and the upper contact member 12A have a thickness of, for example, 22 mm, a width in the bridge axis direction D1 of X [mm], and a shear stress intensity of SM490 of 105 N/ ^mm2 , the shear strength of the steel plate is X [mm] x 4 sheets x 22 mm x 105 N/ ^mm2 = 9240 x X [N/ ^mm2 ]. In order for this to be the same as the shear strength of the above concrete slab of 140800 N, X = 15 mm. Therefore, the steel plates of the lower contact member 11A and the upper contact member 12A only need to have a width in the bridge axis direction D1 of 15 mm or more.

On the other hand, for bending caused by live load in the direction D2 perpendicular to the bridge axis, the first and second opposing surfaces 36 and 46 are borne by the first and second decks 30A and 40A, respectively, while the tensile stress on the first and second opposing surfaces 36 and 46 is borne by the steel plates of the lower and upper contact members 11A and 12A, respectively, instead of the reinforcing bars. The slip shear resistance τ between the steel plate and the concrete surface to bear the tensile stress is calculated as τ = A C + N μ. A is the area of the friction surface, C is the shear bond strength between the steel plate and the concrete deck, N is the tension due to the fastening member 13A, and μ is the friction coefficient between the steel plate and the concrete deck.

For example, if it is assumed that the width of the lower contact member 11A and the upper contact member 12A in the bridge axis direction D1 is 150 mm, and the friction surface is a circle with a diameter of 150 mm centered on the fastening member 13A, then A = 1/4 × π × (150 mm) ² = 17671 mm ^2. For example, C is assumed to be 0.25 to 0.50 N/mm ^2. For example, N is assumed to be 205000 N. For example, μ is assumed to be 0.28 to 0.60. In this case, the slip shear strength τ is a minimum of 0.25 × 17671 + 0.28 × 205000 = 61818 N. Also, the slip shear strength τ is a maximum of 0.50 × 17671 + 0.60 × 205000 = 131836 N. In this manner, the lower abutment member 11A, the upper abutment member 12A and the fastening member 13A can be designed according to the conditions under which the first floor slab 30A and the second floor slab 40A are erected.

The support length l, which is the distance between the bolt 13b of the fastening member 13A inserted into the first hole 34 of the first floor slab 30A and the bolt 13b of the fastening member 13A inserted into the second hole 44 of the second floor slab 40A, is preferably such that, relative to the thickness t of the lower contact member 11A and the upper contact member 12A, support length l/2≦thickness t in order to ensure that the steel plates of the lower contact member 11A and the upper contact member 12A have a shear load-bearing structure.

As shown in Fig. 10(A) and Fig. 10(B), while the first deck 30A is used as a road with one lane on each side, after the fastening process, a tensioning process is performed in which a tensioning material 51 is inserted into a tensioning material insertion hole 50 that connects any one of the first deck 30A installed in the first deck installation process and the second deck 40A installed in the second deck installation process, and tensioning force is applied to the first deck 30A and the second deck 40A by the tensioning material 51. As shown in Fig. 11(A) and Fig. 11(B), while the first deck 30A is used as a road with one lane on each side, a removal process is performed in which the lower abutment member 11A, the upper abutment member 12A, and the fastening member 13A are removed after the tensioning process.

As shown in Figures 12(A) and 12(B), the filler material 40f is filled into the unfilled area 30n that was not filled with the filler material 30f in the filling process, for example, the gap 30g near the erection jig 10A and the gap 40g between the multiple second decks 40A installed in the second deck installation process. In addition, the first hole 34 and the second hole 44 are filled with the filler material 90. The temporary protective fence 81 is removed. A wall balustrade 72 is installed at the end of the second deck 40A opposite to the first deck 30A. The deck replacement is completed, and the first deck 30A and the second deck 40A are used as a two-lane road on each side.

The removal process for removing the lower contact member 11A, the upper contact member 12A, and the fastening member 13A, which is performed after the tensioning process, may be performed after the filling process for filling the filler material 40f into the unfilled areas 30n where the filler material 30f was not filled, for example, the gaps 30g near the installation jig 10A and the gaps 40g between the multiple second decks 40A installed in the second deck installation process.

As a result, even when the first deck 30A is used as a one-lane road with heavy vehicles traveling on it, the vertical relative displacement between the first deck 30A and the second deck 40A is suppressed. Therefore, when the first deck 30A and the second deck 40A are connected by applying tension with the tensioning material 51, and when the gaps 40g between the multiple second decks 40A installed in the second deck installation process are filled with the filler 40f, work can be performed with relative displacement suppressed.

According to this embodiment, in a deck installation structure 1A that connects a first deck 30A installed on a first bridge girder 21 and a second deck 40A installed on a second bridge girder 22 that is spaced apart from the first bridge girder 21 in a direction intersecting the bridge axis direction D1, the lower abutment member 11A abuts across the first lower surface 31 of the first deck 30A and the second lower surface 41 of the second deck 40A, and the upper abutment member 12A abuts across the first upper surface 32 of the first floor slab 30A and the second upper surface 42 of the second floor slab 40A, and the fastening member 13A fastens the lower abutment member 11A and the upper abutment member 12A, so that the tension member 51 is inserted into the tension member insertion hole 50 that connects the first floor slab 30A and the second floor slab 40A, and the first floor slab 30A and the second floor slab 40A can be connected before tension is applied by the tension member 51.

As a result, tension is applied by the tension members 51, and until the first and second decks 30A and 40A are joined together, it is possible to prevent one deck from moving due to the load caused by passing vehicles. Therefore, even if the first deck 30A is used as a one-lane road on one side before tension is applied to the first and second decks 30A and 40A by the tension members 51, and heavy vehicles are running on the first deck 30A, the relative vertical displacement of the first and second decks 30A and 40A due to vibrations caused by repeated fluctuating loads is suppressed, construction accuracy can be ensured, and damage to the first opposing surface 36 of the first deck 30A and the second opposing surface 46 of the second deck 40A can be prevented.

In addition, according to this embodiment, the fastening member 13A is inserted into the first hole 34 that penetrates from the first lower surface 31 to the first upper surface 32 of the first deck 30A and extends across the lower contact member 11A and the upper contact member 12A. Therefore, when multiple first decks 30A are installed at intervals from each other along the bridge axis direction D1 on the first bridge girder 21 and the gaps 30g between the multiple first decks 30A are filled with the gap material 30f, the fastening member 13A is unlikely to hinder the filling of the gap material 30f.

In addition, according to this embodiment, after the tensioning process, the lower abutment member 11A, the upper abutment member 12A, and the fastening member 13A are removed in the removal process, so that the lower abutment member 11A, the upper abutment member 12A, and the fastening member 13A that are no longer necessary after the tensioning process can be prevented from becoming an obstacle to subsequent construction. In addition, it can be prevented from becoming an obstacle to the process of filling the gap material 40f between the multiple first floor slabs 30A or between the multiple second floor slabs 40A.

In addition, according to this embodiment, in the first deck installation process, a plurality of first decks 30A are installed on the first bridge girder 21 along the bridge axis direction D1 at intervals 30g, and the intervals 30g between the plurality of first decks 30A installed in the first deck installation process are filled with filler material 30f by the filling process, so that the first deck 30A can be used as a road. In the second deck installation process, a second deck 40A is installed adjacent to any of the first decks 30A installed in the first deck installation process, and the adjacent first decks 30A and second decks 40A can be connected to each other by the lower abutment process, the upper abutment process, and the fastening process before tension is applied by the tensioning material 51 in the tensioning process.

In addition, according to this embodiment, in the provisional upper abutment process, the upper abutment member 12A is abutted against the first upper surface 32 so that the entire upper abutment member 12A is positioned inside the first opposing surface 36 of the first floor slab 30A installed in the first floor slab installation process, so that the upper abutment member 12A is prevented from becoming an obstacle when the second floor slab 40A is installed in the second floor slab installation process.

In addition, according to this embodiment, in the temporary lower abutment step, the lower abutment member 11A is abutted against the first lower surface 31 so that a part of the lower abutment member 11A protrudes outside the first opposing surface 36 that faces the second bridge girder 22 side of the first deck 30A installed in the first deck installation step, so that the lower abutment member 11A can be used as a guide when the second deck 40A is installed in the second deck installation step. In other words, the lower abutment member 11A installed on the first lower surface 31 of the first deck 30A, which is subjected to a live load and undergoes deflection and deformation, serves as a guide, and the first deck 30A and the second deck 40A are connected in a state of downward deflection. As a result, it is possible to ensure a connection accuracy close to ±0 mm, for example.

The following describes a deck installation structure and deck installation method according to the second embodiment of the present invention. In this embodiment, the steps described in Figures 1 to 3 above are carried out in the same manner as in the first embodiment. As shown in Figures 13(A), 13(B), and 13(C), in this embodiment, a first deck 30B that does not have a first hole portion 34 is installed in the first deck installation step.

Before the first floor slab installation process is performed, two installation jigs 10B are attached near the first opposing surface 36 of the first floor slab 30B. The installation jigs 10B have a lower abutment member 11B that abuts against the first lower surface 31 of the first floor slab 30B, an upper abutment member 12B that abuts against the first upper surface 32 of the first floor slab 30B, and a fastening member 13B that fastens the lower abutment member 11B and the upper abutment member 12B together.

The lower contact member 11B and the upper contact member 12B are rectangular members formed from a steel plate such as SM490. The upper contact member 12B includes a pair of recesses 12d spaced apart in the longitudinal direction on the surface opposite to the surface that contacts the first upper surface 32. The lower contact member 11B also includes recesses similar to those of the upper contact member 12B on the surface opposite to the surface that contacts the first lower surface 31.

As shown in Figure 14 (A) (and Figure 14 (B)), for the convenience of subsequent work in the filling process, the gap 30g near the installation jig 10B is not filled with the filling material 30f. In other words, the gap 30g between the multiple first floor slabs 30B has an unfilled area 30n in which the gap 30g is not filled with the filling material 30f. For example, the unfilled area 30n in which the gap 30g is not filled with the filling material 30f is a predetermined range from the first opposing surface 36.

The fastening member 13B is arranged as a steel member extending across the lower abutment member 11B and the upper abutment member 12B outside the first bridge axis direction surface 35 through the unfilled area 30n where the filling material 30f is not filled. The fastening member 13B includes a main body 13x and a threaded portion 13s. The main body 13x extends across the lower part of the lower abutment member 11B and the upper part of the upper abutment member 12B outside the first bridge axis direction surface 35 through the unfilled area 30n where the filling material 30f is not filled. The main body 13x includes one threaded hole portion 13h at each of the upper end and the lower end. The threaded portion 13s is screwed into each of the threaded hole portions 13h. The tip of the upper threaded portion 13s fits into one of the recesses 12d of the upper abutment member 12B. The tip of the lower screw portion 13s also fits into one of the recesses of the lower abutment member 11B. By screwing the screw portion 13s into each of the screw holes 13h, the lower abutment member 11B and the upper abutment member 12B are fastened together while the first floor slab 30B is sandwiched between the lower abutment member 11B and the upper abutment member 12B.

As in the first embodiment described above, immediately after the first floor slab installation process, a provisional upper abutment process is performed in which the upper abutment member 12B is abutted against the first upper surface 32 so that the entire upper abutment member 12B is positioned inside the first opposing surface 36 of the first floor slab 30B installed in the first floor slab installation process, and the lower abutment member 11B is abutted against the first lower surface 31 so that the entire lower abutment member 11B is positioned inside the first opposing surface 36.

The steps described in Figs. 5 to 6 above are carried out in the same manner as in the first embodiment. As shown in Figs. 14(A) and 14(B), the existing deck 102 is removed from the second bridge girder 22. As shown in Figs. 14(A), 14(B), and 14(C), after the existing deck 102 is removed from the second bridge girder 22 and before the second deck installation step described below, the lower abutment member 11B is abutted against the first lower surface 31 as a temporary lower abutment step so that a part of the lower abutment member 11B protrudes outward from the first opposing surface 36 that faces the second bridge girder 22 side of the first deck 30B installed in the first deck installation step.

The above-mentioned temporary lower abutment process can be performed by slightly loosening the screw thread 13s into the lower screw hole 13h of the main body 13x of the fastening member 13B. After the temporary lower abutment process is completed and before the second deck installation process, the screw thread 13s is screwed into the lower screw hole 13h again as a temporary fastening process, whereby the lower abutment member 11B abutted against the first lower surface 31 in the temporary lower abutment process and the upper abutment member 12B abutted against the first upper surface 32 in the temporary upper abutment process are fastened by the fastening member 13B.

As shown in Figures 15(A) and 15(B), in this embodiment, a second floor slab 40B that does not have a second hole portion 44 is installed in the second floor slab installation process. In the second floor slab installation process, similar to the first embodiment, the second floor slab 40B is installed while the second lower surface 41 is abutted against the lower abutment member 11B, a portion of which protrudes outward from the first opposing surface 36, so that the lower abutment process is performed together with the second floor slab installation process.

As shown in Figures 15(A), 15(B) and 15(C), after the second floor slab installation step and the lower abutment step, the upper abutment member 12B is moved so that a part of the upper abutment member 12B protrudes outside the first opposing surface 36, thereby performing the upper abutment step in which the upper abutment member 12B abuts across the first upper surface 32 of any one of the first floor slabs 30B installed in the first floor slab installation step and the second upper surface 42 of the second floor slab 40B installed in the second floor slab installation step. The upper abutment step can be performed by slightly loosening the screw part 13s from the upper screw hole part 13h of the main body part 13x of the fastening member 13B.

After the upper contact step, a fastening step is performed in which the lower contact member 11B, which has been brought into contact across the first lower surface 31 and the second lower surface 41 in the lower contact step, and the upper contact member 12B, which has been brought into contact across the first upper surface 32 and the second upper surface 42 in the upper contact step, are fastened by the fastening member 13B. In the fastening step, the first and second floor slabs 30B and 40B are sandwiched between the lower contact member 11B and the upper contact member 12B by the fastening member 13B extending across the lower contact member 11B and the upper contact member 12B on the outside of the first bridge axis direction surface 35 facing the bridge axis direction D1 of the first floor slab 30B, while the lower contact member 11B and the upper contact member 12B are fastened. In the fastening step, the screw portion 13s is again screwed into the upper screw hole portion 13h.

In the fastening process, the lower abutment member 11B and the upper abutment member 12B are fastened by another fastening member 13B extending across the lower abutment member 11B and the upper abutment member 12B on the outside of the second bridge axis direction surface 45 facing the bridge axis direction D1 of the second deck 40B. The other fastening member 13B is arranged near the second bridge axis direction surface 45 and extends across the lower abutment member 11B and the upper abutment member 12B so that the tip of the upper screw portion 13s fits into the other recess 12d on the second upper surface 42 side of the upper abutment member 12B and the tip of the lower screw portion 13s fits into the other recess on the second lower surface 41 side of the lower abutment member 11B. In other words, two fastening members 13B are arranged for one erection jig 10B. The threaded portion 13s is screwed into the upper and lower screw hole portions 13h of another fastening member 13B, so that the lower abutment member 11B and the upper abutment member 12B are fastened together while the first floor slab 30B and the second floor slab 40B are clamped between the lower abutment member 11B and the upper abutment member 12B.

The support length l, which is the distance between the threaded portion 13s that fits into the lower abutment member 11B on the first floor slab 30B side and the threaded portion 13s that fits into the lower abutment member 11B on the second floor slab 40B side, and the distance between the threaded portion 13s that fits into the upper abutment member 12B on the first floor slab 30B side and the threaded portion 13s that fits into the upper abutment member 12B on the second floor slab 40B side, is preferably such that the support length l/2≦thickness t in order to ensure that the steel plates of the lower abutment member 11B and the upper abutment member 12B have a shear load-bearing structure.

After the fastening process, the deck installation structure 1B of this embodiment is formed. Each of the fastening members 13B extends across the lower abutment member 11B and the upper abutment member 12B on the outside of the first bridge axis direction surface 35 and the second bridge axis direction surface 45. Thereafter, the process described in Figures 10 to 12 above is carried out in the same manner as in the first embodiment, and the replacement of the deck is completed.

In this embodiment, the fastening member 13B extends across the lower contact member 11B and the upper contact member 12B on the outside of the first bridge axis direction surface 35 facing the bridge axis direction D1 of the first deck 30, so that the fastening member 13B can be easily installed and removed. In addition, the first deck 30B does not have the first hole portion 34 penetrating from the first lower surface 31 to the first upper surface 32, so that the fastening member 13B can be installed and removed even easier. In addition, since it is not necessary to provide the first hole portion 34 in the first deck 30B and it is not necessary to provide the second hole portion 44 in the second deck 40B, decks formed from existing precast concrete can be used as they are.

The third embodiment of the present invention will be described below. As shown in FIG. 16(A), in the deck installation structure 1C of this embodiment, the first lower surface 31, the first upper surface 32, the second lower surface 41, and the second upper surface 42 have rough surface portions 31r, 32r, 41r, and 42r having a higher friction coefficient than other portions. The rough surface portions 31r, 32r, 41r, and 42r are formed, for example, by performing a roughening treatment on the first lower surface 31, the first upper surface 32, the second lower surface 41, and the second upper surface 42.

The installation jig 10C of this embodiment has a lower contact member 11C, an upper contact member 12C, and a fastening member 13A, which are substantially similar to the installation jig 10A of the first embodiment. However, the lower contact member 11C has a rough surface portion 11r on the surface that contacts the first lower surface 31 and the second lower surface 41, which has a larger friction coefficient than a flat surface. The upper contact member 12C has a rough surface portion 12r on the surface that contacts the first upper surface 32 and the second upper surface 42, which has a larger friction coefficient than a flat surface. The rough surface portions 11r and 12r are formed by subjecting the lower contact member 11C and the upper contact member 12C to a roughening treatment or a corrugated processing. A splice H steel or the like may be applied to the lower contact member 11C and the upper contact member 12C. At least one of the rough surface portions 11r, 12r, 31r, 32r, 41r, and 42r may be provided.

According to this embodiment, the rough surface portions 11r, 12r, 31r, 32r, 41r, and 42r increase the coefficient of friction between the lower contact member 11C and the upper contact member 12C and the first floor slab 30A and the second floor slab 40A, thereby increasing the slip shear resistance τ.

The fourth embodiment of the present invention will be described below. As shown in FIG. 16(B), in the floor slab installation structure 1D of this embodiment, the installation jig 10D has a lower contact member 11D, an upper contact member 12D, and a fastening member 13A, which are substantially similar to the installation jig 10A of the first embodiment. However, the lower contact member 11D has a rubber layer 11g on the surface that contacts the first lower surface 31 and the second lower surface 41. The upper contact member 12D has a rubber layer 12g on the surface that contacts the first upper surface 32 and the second upper surface 42. Even if the angle between the lower contact member 11D and the upper contact member 12D and the first floor slab 30 and the second floor slab 40 fluctuates, the support pressure can be distributed and the unevenness of the support pressure can be reduced.

The fifth embodiment of the present invention will be described below. As shown in FIG. 16(C), in the deck installation structure 1E of this embodiment, the installation jig 10E has a lower abutment member 11B, an upper abutment member 12B, and a fastening member 13C, similar to the installation jig 10B of the second embodiment, but one fastening member 13C is arranged for one installation jig 10E.

The fastening member 13C is a steel member extending across the lower contact member 11B and the upper contact member 12B outside the first bridge axis direction surface 35 and the second bridge axis direction surface 45. The fastening member 13B includes a main body portion 13y and a threaded portion 13s. The main body portion 13y extends across the lower part of the lower contact member 11B and the upper part of the upper contact member 12B outside the first bridge axis direction surface 35 and the second bridge axis direction surface 45. The main body portion 13y includes two threaded hole portions 13h at each of the upper end and the lower end. The threaded portion 13s is screwed into each of the threaded hole portions 13h. In other words, in this embodiment, one fastening member 13C serves as the two fastening members 13B in the second embodiment, so the effort required to place the fastening member 13C is reduced.

The following describes the deck installation structure and deck installation method according to the sixth embodiment of the present invention. In this embodiment, the steps described in Figs. 1 to 3 above are performed in the same manner as in the first embodiment. As shown in Figs. 17(A), 17(B) and 17(C), in this embodiment, in the first deck installation step, for example, the first deck 30C not having the first hole portion 34 is installed. In the second deck installation step, for example, the second deck 40C not having the second hole portion 44 is installed. As with the first deck 30A and the second deck 40A in the first embodiment, the first deck 30C has a first opposing surface 36 facing the second bridge girder 22, and the second deck 40C has a second opposing surface 46 facing the first bridge girder 21.

The first opposing surface 36 includes a recess 36k recessed toward the first bridge girder 21, and the second opposing surface 46 includes a recess 46k recessed toward the second bridge girder 22. After the first and second deck installation processes, the first and second opposing surfaces 36 and 46 are installed so as to face each other across a gap 52. The installation jig 10F of this embodiment is attached, for example, after the first and second deck installation processes. Other than the above, the processes described in Figures 4 to 8 above are performed in the same manner as in the first embodiment. Unlike the second embodiment, the filler material 30f is filled up to the gap 30g near the gap 52 where the installation jig 10F is attached, and it is not necessary to provide an unfilled area 30n where the filler material 30f is not filled. This can further improve work efficiency.

The installation jig 10F has a lower abutment member 11E that abuts across the first lower surface 31 of the first floor slab 30C and the second lower surface 41 of the second floor slab 40C, an upper abutment member 12E that abuts across the first upper surface 32 of the first floor slab 30C and the second upper surface 42 of the second floor slab 40C, and a fastening member 13D that fastens the lower abutment member 11E and the upper abutment member 12E. The lower abutment member 11E and the upper abutment member 12E are members formed from rectangular steel plates such as SM490. The lower abutment member 11E has a recess 11c on the surface facing the first lower surface 31 and the second lower surface 41, where the portion spanning the gap 52 is recessed across the first floor slab 30C and the second floor slab 40C. The upper abutment member 12E has a recess 12c on the surface facing the first upper surface 32 and the second upper surface 42, which is recessed in the portion spanning the gap 52 across the first floor plate 30C and the second floor plate 40C.

The fastening member 13D is disposed inside a tube member 53 such as a sheath tube disposed in the gap 52, and extends across the lower contact member 11E and the upper contact member 12E. The fastening member 13D includes a bolt 13b and two nuts 13n. The bolt 13b has threads at both ends. The bolt 13b may be, for example, a PC steel rod with threads at both ends. The upper end of the bolt 13b opens into the recess 12c of the upper contact member 12E and is screwed into a bolt hole portion 12h that does not penetrate to the surface opposite the recess 12c. The lower end of the bolt 13b is inserted into a bolt hole portion 11h that penetrates from the recess 11c of the lower contact member 11E to the surface opposite the recess 11c, and two nuts 13n are screwed into each of them.

The support length l, which is the distance that the recesses 11c and 12c are recessed across the first floor slab 30C and the second floor slab 40C, is preferably greater than or equal to the thickness t of the lower contact member 11E and the upper contact member 12E, so as to ensure that the steel plates of the lower contact member 11C and the upper contact member 12C have a shear load-bearing structure.

In this embodiment, for example, after the first and second floor slab installation processes, the upper abutment member 12E is placed on the first upper surface 32 of the first floor slab 30C and the second upper surface 42 of the second floor slab 40C so that the recess 12c and the bolt hole portion 12h of the upper abutment member 12E are aligned with the gap 52, and an upper abutment process is performed in which the upper abutment member abuts across the first upper surface 32 of the first floor slab 30C installed in the first floor slab installation process and the second upper surface 42 of the second floor slab 40C installed in the second floor slab installation process.

After the upper abutment step, the upper end of the bolt 13b of the fastening member 13D is screwed into the bolt hole portion 12h of the upper abutment member 12E. The pipe member 53 is arranged so that the bolt 13b is arranged inside the pipe member 53. The lower end of the bolt 13b of the fastening member 13D is inserted into the bolt hole portion 11h of the lower abutment member 11E, and the lower abutment step is performed in which the lower abutment member 11E is abutted across the first lower surface 31 of the first floor slab 30C installed in the first floor slab installation step and the second lower surface 41 of the second floor slab 40C installed in the second floor slab installation step. The upper abutment step may be performed in a state in which the fastening member 13D is previously screwed into the bolt hole portion 12h of the upper abutment member 12E and attached, or the upper abutment step may be performed in a state in which the fastening member 13D and the pipe member 53 are previously attached to the upper abutment member 12E.

By screwing two nuts 13n into the lower end of the bolt 13b, the bolt 13b is disposed in the gap 52 between the first opposing surface 36 facing the second bridge girder 22 side of the first deck 30C and the second opposing surface 46 facing the first bridge girder 21 side of the second deck 40C, and a fastening process is performed in which the lower abutment member 11E and the upper abutment member 12E are fastened by the fastening member 13D extending across the lower abutment member 11E and the upper abutment member 12E.

By performing the upper abutment process, the lower abutment process, and the fastening process in the above manner, many operations including the lower abutment process can be performed from the first underside 31 of the first deck 30C and the second underside 41 of the second deck 4C, improving the convenience of replacing the decks. After the fastening process, the deck installation structure 1F of this embodiment is formed. In the deck installation structure 1F of this embodiment, the first opposing surface 36 and the second opposing surface 46 face each other across a gap 52, and the fastening member 13D is disposed in the gap 52 and extends across the lower abutment member 11E and the upper abutment member 12E.

In this embodiment, for example, the lower abutment member 11E, the upper abutment member 12E, the fastening member 13D, and the pipe member 53 of the installation jig 10F are attached to the second floor slab 40C to be installed in the second floor slab installation process, and the second floor slab 40C is brought in to perform the second floor slab installation process, and the nut 13n of the fastening member 13D may be loosened once and then retightened to perform the lower abutment process, the upper abutment process, and the fastening process.

As shown in Figures 18(A), 18(B) and 18(C), the gap 52 is filled and embedded with filler 90 on the outside of the pipe member 53. Because the filler 90 is filled on the outside of the pipe member 53, the rod portion of the bolt 13b of the fastening member 13D arranged on the inside of the pipe member 53 is not restrained by the filler 90. After the filler 90 filled in the gap 52 has solidified, a tensioning process is carried out in the same manner as in the first embodiment described above.

As shown in Figures 19(A), 19(B) and 19(C), after the tensioning process, a removal process is performed in which the lower contact member 11E, the upper contact member 12E and the fastening member 13D are removed. In the removal process, the pipe member 53 is also removed. Thereafter, the process described in Figure 12 above is performed in the same manner as in the first embodiment, and the hole 91 of the gap 52 after the pipe member 53 is removed is filled with the filler material 90, thereby completing the replacement of the deck. Note that it is sufficient that at least the lower contact member 11E and the fastening member 13D are removed, and the pipe member 53 may be left in place and the hole 91 of the pipe member 53 may be filled with the filler material 90.

According to this embodiment, the first floor slab 30C has a first opposing surface 36 facing the second bridge girder 22, and the second floor slab 40C has a second opposing surface 46 facing the first bridge girder 21, and the first opposing surface 36 and the second opposing surface 46 face each other across a gap 52, and the fastening member 13D is disposed in the gap 52 and extends across the lower abutment member 11E and the upper abutment member 12E, so that the fastening member 13D can be easily installed and removed. In addition, even if the first floor slab 30C does not have a hole that penetrates from the first lower surface 31 to the first upper surface 32, the fastening member 13D can be installed and removed, so that the installation and removal of the fastening member 13D becomes even easier. In addition, the first floor slab 30C does not need to have holes that penetrate from the first lower surface 31 to the first upper surface 32, and the second floor slab 40C does not need to have holes that penetrate from the second lower surface 41 to the second upper surface 42, so deterioration of the quality of the floor slabs to be erected can be suppressed.

In addition, according to this embodiment, the lower contact member 11E and the upper contact member 12E have recesses 11c, 12c in the center (middle) that are recessed across the first floor slab 30C and the second floor slab 40C, making it easy to accommodate fluctuations in the angle between the first floor slab 30C and the second floor slab 40C due to vibrations, construction errors, etc.

Although the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment and may be implemented in various forms. For example, the first bridge girder 21 and the second bridge girder 22 in the above embodiment may be a plate girder, a truss girder, or the like. In addition, joint reinforcements protruding from the first bridge axis direction surface 35 and the second bridge axis direction surface 45 may be provided. In addition, the first opposing surface 36 and the second opposing surface 46 may be provided with shear keys that fit together or shear keys that do not contact each other, and a filler such as a mortar-based material or a resin-based material may be filled at a predetermined interval before the tensioning process for applying tension. In addition, in the first embodiment, the third embodiment, and the fourth embodiment, the fastening member 13A inserted into the second hole portion 44 of the second deck 40, the bolt hole portions 11h, 12h corresponding to the second hole portion 44, and the second hole portion 44 may be omitted.

In the second embodiment, the other fastening member 13B extending across the lower contact member 11B and the upper contact member 12B on the outside of the second bridge axis direction surface 45 may be omitted. In the second and fifth embodiments, the recess 12d of the upper contact member 12B and the recess of the lower contact member 11B may be omitted, and the lower contact member 11B and the upper contact member 12B may be simply plate materials. In the second and fifth embodiments, the fastening members 13B and 13C may be made of cast iron. In the second and fifth embodiments, the fastening members 13B and 13C may have upper and lower ends made of cast iron, an intermediate portion between the upper and lower ends made of steel, and the upper, intermediate, and lower ends may be detachable from each other.

In addition, the recesses 11c, 12c that the lower contact member 11E and the upper contact member 12E had in the sixth embodiment may be provided in the lower contact members 11A, 11B, 11C, 11D and the upper contact members 12A, 12B, 12C, 12D in the first to fifth embodiments. In addition, in the sixth embodiment, the lower contact member 11E, the upper contact member 12E, and the fastening member 13D are all removed, but in a case where, for example, the deck slab is replaced for a short period of time, such as late at night, while vehicles are allowed to pass through most of the day, and this is repeated over multiple days, in order to reduce the construction time and increase the vehicle passage time, a temporary pavement may be made with the upper contact member 12E left in place until the final pavement is made, and vehicles may pass on the temporary pavement, and the upper contact member 12E may be removed when the final pavement is made. In addition, the upper contact member 12E may be left under the actual pavement when the final pavement is made.

In the above embodiment, the deck is divided into two in the direction perpendicular to the bridge axis D2, but the deck may be divided into three or more in the direction perpendicular to the bridge axis D2. In addition, the lower contact members 11A, 11B, 11C, 11D, and 11E and the upper contact members 12A, 12B, 12C, 12D, and 12E may be made of steel, castings, stainless steel, or other iron, or may be made of concrete such as high-strength concrete precast members and carbon fiber.

1A, 1B, 1C, 1D, 1E, 1F...Erection structure, 10A, 10B, 10C, 10D, 10E, 10F...Erection jig, 11A, 11B, 11C, 11D, 11E...Lower abutment member, 11h...Bolt Hole portion, 11r... rough surface portion, 11g... rubber layer, 11c... recessed portion, 12A, 12B, 12C, 12D, 12E... upper contact member, 12h... bolt hole portion, 12d... Recess, 12r...rough surface portion, 12g...rubber layer, 12c...recess, 13A, 13B, 13C, 13D...fastening member, 13b...bolt, 13n...nut, 13x, 13y...main body portion, 13h...screw hole portion, 13s... Screw part, 21...first bridge girder, 22...second bridge girder, 30A, 30B, 30C...first deck, 30g...spacing, 30f...filling material, 30n...unfilled area, 31...first 1 lower surface, 31r...rough surface portion, 32...first upper surface, 32r...rough surface portion, 33...first tendon insertion hole portion, 34...first hole portion, 35...first bridge axis direction surface, 36...first opposing surface, 36k...recess, 40A, 40B, 40C...second floor slab, 40g...gap, 40f...filling material, 41...second lower surface, 41r...rough surface portion, 42...second upper surface, 42r...rough surface portion, 43 ...Second tendon insertion hole portion, 44...second hole portion, 45...second bridge axial direction surface, 46...second opposing surface, 46k...recess, 50...tension rod insertion hole portion, 51...tension rod, 52...gap, 53...pipe member, 61 , 62, 71, 72...wall balustrade, 81, 82...temporary protective fence, 90...internal filling material, 91...hole, 100, 101, 102...existing deck, t...thickness, l...support length, D1... Bridge axis direction, D2...perpendicular to the bridge axis.

Claims (11)

A deck installation structure that connects a first deck installed on a first bridge girder and a second deck installed on a second bridge girder that is separated from the first bridge girder in a direction intersecting the bridge axis direction,
A lower abutment member that abuts across a first lower surface of the first floor slab and a second lower surface of the second floor slab;
An upper abutment member that abuts across a first upper surface of the first floor slab and a second upper surface of the second floor slab;
a fastening member that fastens the lower contact member and the upper contact member;
a tension member insertion hole portion through which a tension member that applies tension to the first floor slab and the second floor slab is inserted, the tension member insertion hole portion communicating with the first floor slab and the second floor slab and through which a tension member that applies tension to the first floor slab and the second floor slab is inserted;
A deck erection structure equipped with the above structure. The first floor slab has a first hole portion penetrating from the first lower surface to the first upper surface,
The deck installation structure according to claim 1 , wherein the fastening member is inserted into the first hole portion and extends across the lower contact member and the upper contact member. The first deck has a first bridge axis direction surface facing the bridge axis direction,
The deck installation structure according to claim 1 , wherein the fastening member extends across the lower contact member and the upper contact member on an outer side of the first bridge axis direction surface. The first deck has a first opposing surface facing the second bridge girder,
The second deck has a second opposing surface facing the first bridge girder,
The first opposing surface and the second opposing surface face each other with a gap therebetween,
The deck installation structure according to claim 1 , wherein the fastening member is disposed in the gap and extends across the lower contact member and the upper contact member. The floor slab installation structure according to any one of claims 1 to 4, wherein the lower contact member or the upper contact member has a recessed portion extending across the first floor slab and the second floor slab. A method for erecting a deck that connects a first deck installed on a first bridge girder and a second deck installed on a second bridge girder that is spaced apart from the first bridge girder in a direction intersecting the bridge axis direction,
A first deck installation process of installing the first deck on the first bridge girder;
A second deck installation process of installing the second deck on the second bridge girder;
A lower abutment process in which a lower abutment member is abutted across a first lower surface of the first floor slab installed in the first floor slab installation process and a second lower surface of the second floor slab installed in the second floor slab installation process;
An upper abutment process in which an upper abutment member is abutted across a first upper surface of the first floor slab installed in the first floor slab installation process and a second upper surface of the second floor slab installed in the second floor slab installation process;
a fastening process of fastening the lower contact member, which has been brought into contact with the first lower surface and the second lower surface in the lower contact process, and the upper contact member, which has been brought into contact with the first upper surface and the second upper surface in the upper contact process, by a fastening member;
a tensioning step of inserting a tensioning material into a tensioning material insertion hole portion that communicates with the first floor slab and the second floor slab after the fastening step, and applying tension to the first floor slab and the second floor slab by the tensioning material;
a removal step of removing the lower contact member, the upper contact member, and the fastening member after the tensioning step;
A method for erecting a deck equipped with the above structure. In the first deck installation step, a plurality of the first decks are installed at intervals from each other along the bridge axis direction on the first bridge girder,
Further includes a filling step of filling the gaps between the first floor slabs installed in the first floor slab installation step with a filling material,
In the second floor slab installation step, the second floor slab is installed adjacent to any one of the first floor slabs installed in the first floor slab installation step,
In the lower abutment step, a lower abutment member is abutted across a first lower surface of any one of the first floor slabs installed in the first floor slab installation step and a second lower surface of the second floor slab installed in the second floor slab installation step,
In the upper abutment step, an upper abutment member is abutted across a first upper surface of any one of the first floor slabs installed in the first floor slab installation step and a second upper surface of the second floor slab installed in the second floor slab installation step,
The deck installation method described in claim 6, wherein in the tensioning process, a tensioning material is inserted into the tensioning material insertion hole portion that connects any of the first deck slabs installed in the first deck installation process and the second deck slab installed in the second deck installation process, thereby applying tension to the first deck slab and the second deck slab. The floor slab erection method according to claim 6 or 7, in which, in the fastening step, the lower contact member and the upper contact member are fastened by the fastening member that is inserted into a first hole that penetrates from the first lower surface to the first upper surface of the first floor slab and extends across the lower contact member and the upper contact member. The method for erecting a deck as described in claim 6 or 7, in which, in the fastening step, the lower abutment member and the upper abutment member are fastened by the fastening member extending across the lower abutment member and the upper abutment member on the outside of the first bridge axis direction surface of the first deck facing the bridge axis direction. The method for erecting a deck as described in claim 6 or 7, in which, in the fastening step, the lower contact member and the upper contact member are fastened by the fastening member that is disposed in the gap between a first opposing surface of the first deck facing the second bridge girder side and a second opposing surface of the second deck facing the first bridge girder side and that extends across the lower contact member and the upper contact member. The method for erecting a deck according to any one of claims 6 to 10, wherein the lower contact member or the upper contact member has a recess that is recessed across the first deck and the second deck.

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