JP2017101445A - Joining method of precast floor slab and joining structure of precast floor slab - Google Patents

Abstract

PROBLEM TO BE SOLVED: To further facilitate joining operation of precast floor slabs when joining two or more precast floor slabs.SOLUTION: In an arrangement step, each of the end surfaces 14 of a pair of precast floor slabs 10 having hollow recesses 12 in end surfaces 14 is made to face each other so as to be positioned to a flange top surface 2 of a steel beam 1 in a plan view. In a joining step, the pair of precast floor slabs 10 and the steel beam 1 are joined to each other by filling a filler 8 in the recess 12. The flange top surface 2 of the steel beam 1 becomes a substitute for a formwork to eliminate the need of the formwork. In the arrangement step, a stud dowel 3 projecting from the flange top surface 2 of the steel beam 1 is contained in the recess 12 in a plan view, and therefore the precast floor slab 10 can be prevented from being shifted in the direction being parallel to the end surface 14 after the joining step. Accordingly, the joining operation of the precast floor slabs 10 becomes simpler when joining two or more precast floor slabs 10.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a precast floor slab joining method and a precast floor slab joining structure.

  A precast slab manufactured as a precast concrete member is used as a floor slab of a steel bridge or the like. For example, Patent Document 1 discloses a method of joining a precast floor slab to a steel girder of a steel bridge in which stud gibbles are arranged on the upper surface. In the method of Patent Document 1, an opening (through hole) communicating from the lower surface to the upper surface of the precast floor slab is provided at a position corresponding to the stud gibber of the precast floor slab. After the precast floor slab is placed on the upper surface of the steel girder so that the stud gibber is accommodated in the opening, the precast floor slab and the steel girder are joined by filling the opening with non-shrink mortar. The

Japanese Patent Laid-Open No. 10-311007

  By the way, when the width of the steel bridge is wide, it may be difficult to cover the direction perpendicular to the bridge axis of the steel bridge with one precast floor slab. Therefore, when the width of the steel bridge is wide as described above, a plurality of precast slabs are arranged while being joined to each other in the direction perpendicular to the bridge axis of the steel bridge. However, when a plurality of precast floor slabs are to be joined, a joint filled with mortar or the like must be provided at the joint between the precast floor slabs, so it is necessary to install a formwork below the joint. Yes, joining work of precast floor slabs becomes complicated.

  Then, this invention aims at providing the joining method of the precast floor slab and the joining structure of a precast floor slab which the joining operation | work of a precast floor slab becomes simpler, when joining several precast floor slabs. .

  In the present invention, the end surfaces of a pair of precast slabs having recesses recessed in the end surface in plan view are opposed to each other so as to be positioned on the upper surface of the girders, and at least a part of the detent member protruding from the upper surface of the girders is Arranging the pair of precast floor slabs on the upper surface of the spar so as to enter the recesses in plan view, and filling the recesses with a filler to join the pair of precast slabs and spar together. A precast slab joining method including a joining step.

  According to this configuration, in the disposing step, the end surfaces of the pair of precast floor slabs having recesses recessed in the end surfaces in plan view are opposed to each other so as to be positioned on the upper surface of the girders, and in the joining step, in the recesses A pair of precast slabs and girders are joined together by filling the filler. For this reason, the upper surface of a girder becomes a substitute for a formwork, and the formwork for filling a filler in a joining process becomes unnecessary. In addition, in the placement process, at least a part of the stopper member protruding from the upper surface of the girder enters the recess in plan view, so that the precast floor slab is prevented from shifting in a direction parallel to the end face after the joining process. can do. Therefore, when joining a plurality of precast slabs, the joining operation of the precast slabs becomes easier.

  In this case, in the arranging step, it is preferable that the pair of precast floor slabs are arranged on the upper surface of the girder so that the concave portions of the pair of precast floor slabs face each other.

  According to this configuration, in the arranging step, the recesses of the pair of precast floor slabs face each other. Therefore, in the joining step, the fillers are simultaneously filled in each of the recesses of the pair of precast floor slabs. The working efficiency can be improved.

  In addition, after the joining process, it passes through the inside of a set of precast slabs continuous along the direction perpendicular to the bridge axis and intersects with each end face of the set of precast slabs continuous along the direction perpendicular to the bridge axis. According to the tension material arranged in such a manner, it is possible to further include a bridge axis perpendicular post-tensioning step for applying a compressive force in a direction perpendicular to the bridge axis to a set of precast slabs continuous along the direction perpendicular to the bridge axis.

  According to this configuration, after the joining process, each bridge passes through the inside of the pair of precast slabs continuous along the direction perpendicular to the bridge axis of the bridge formed by the girders and the precast slab, and extends along the direction perpendicular to the bridge axis. A compressive force is applied in a direction perpendicular to the bridge axis to a set of continuous precast slabs along the direction perpendicular to the bridge axis by means of a tension member arranged so as to intersect with each end face of the pair of continuous precast decks Since the bridge axis perpendicular direction post-tensioning step is further provided, bending deformation and cracking of a set of precast slabs continuous along the direction perpendicular to the bridge axis can be suppressed.

  Further, it is preferable that the slip preventing member can be removed from the girders after the joining step.

  According to this configuration, since the slip prevention member can be removed from the girder after the joining step, it is easy to replace the precast floor slab after the joining step.

  Further, around each of the concave portions of the pair of precast floor slabs, at least one of the precast floor slab and the girders is provided with a leakage preventing member for preventing leakage of the filler in the joining step before the joining step. It is preferred that they are arranged.

  According to this configuration, at least one of the precast floor slab and the girder around each of the recesses of the pair of precast floor slabs, before the joining process, to prevent leakage of the filler in the joining process Since the leakage preventing member is disposed, the leakage of the filler from the recess can be prevented.

  In addition, the present invention includes a girder and a pair of precast floor slabs arranged on the upper surface of the girder, the girder includes a detent member protruding from the upper surface, and the pair of precast floor slabs are end faces in plan view. Each of the end faces of the pair of precast slabs is opposed to each other so as to be located on the upper surface of the beam, and at least a part of the detent member enters the recess in plan view, This is a joint structure of precast floor slabs arranged on the upper surface of the beam.

  According to the precast slab joining method and the precast slab joining structure of the present invention, when joining a plurality of precast slabs, the joining operation of the precast slabs becomes easier.

It is a perspective view which shows the state which has arrange | positioned the precast floor slab in the steel girder in the arrangement | positioning process of the joining method of the precast floor slab which concerns on embodiment. (A) is the top view to which the recessed part vicinity of the precast floor slab of FIG. 1 was expanded, (b) is sectional drawing by the IIb line | wire of (a). (A) is a figure which shows the example which applied sponge to the leakage prevention member of FIG.2 (b), (b) is a figure which shows the example which applied the angle to the leakage prevention member of FIG.2 (b). (A) is a top view which shows the state which filled the recessed part of Fig.2 (a) with the filler in the joining process, (b) is sectional drawing by the IVb line | wire of (a). It is a top view which shows the state which gave the tension | tensile_strength by the post-tension system to the PC steel materials arrange | positioned inside the joined two precast floor slab. It is a top view which shows the other example of arrangement | positioning of the recessed part of a precast floor slab.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the present embodiment, an aspect in which a precast floor slab is joined to a steel girder of a steel bridge will be mainly described. As shown in FIG. 1, in the arrangement | positioning process of the joining method of the precast floor slab which concerns on embodiment, a pair of precast floor slab 10 is arrange | positioned on the flange upper surface 2 of the steel girder 1 of a steel bridge. Each of the plurality of steel girders 1 is an H-section steel extending in the bridge axis direction X. Each of the plurality of steel girders 1 is arranged in parallel at a predetermined interval in the direction Y perpendicular to the bridge axis.

  A plurality of precast slabs 10 are arranged side by side along the bridge axis direction X of the steel bridge. Moreover, in this embodiment, since the width | variety of a steel bridge is wide, a pair of precast floor slab 10 is arrange | positioned along with the bridge-axis perpendicular direction Y of a steel bridge. Each of the pair of precast slabs 10 arranged side by side along the direction Y perpendicular to the bridge axis of the steel bridge is applied, for example, to the slabs of an up lane and a down lane of an expressway.

  The precast floor slab 10 is manufactured as a precast concrete member. The precast floor slab 10 may be, for example, a steel fiber reinforced concrete and a precast concrete member to which high strength concrete is applied. In addition, prestress can be introduced by a pretension method in the direction that is perpendicular to the bridge axis direction Y when the precast floor slab 10 is manufactured.

  One precast floor slab 10 is supported by flange upper surfaces 2 of three steel girders 1. In the pair of precast floor slabs 10 facing each other on the flange upper surface 2 arranged side by side along the bridge axis perpendicular direction Y of the steel bridge, each end surface 14 of the precast floor slab 10 is formed on the flange upper surface 2 of one steel girder 1. A pair of precast floor slabs 10 are arranged on the flange upper surface 2 of one steel girder 1 while facing each other so as to be positioned. When a highway median strip is installed near the end face 14, the precast slab 10 can be thickened within a range that can be accommodated in the median strip in order to enhance the effect of slippage prevention.

  On the flange upper surface 2 of the steel girder 1 that supports a portion other than the vicinity of the end face 14 of the precast floor slab 10, three stud gibbles (detent members) 3 projecting from the flange upper surface 2 extend along the direction Y perpendicular to the bridge axis. Are arranged in a line. A plurality of sets of three stud gibbles 3 are arranged at predetermined intervals in the bridge axis direction X of the flange upper surface 2. Further, an opening 11 that communicates from the lower surface to the upper surface of the precast floor slab 10 and accommodates the three stud gibels 3 is provided at a location corresponding to the three stud gibbles 3 of the precast floor slab 10. . A precast floor slab 10 is disposed on the upper surface 2 of the flange of the steel beam 1 so that the three stud gibbles 3 are accommodated in the opening 11. In addition, since the edge part on the opposite side to the end surface 14 of the precast floor slab 10 becomes a location where the wall rail of a highway is installed, you may provide the reinforcement etc. for installation of a wall rail.

  On the flange upper surface 2 of the steel girder 1 that supports the vicinity of the end face 14 of the precast floor slab 10, two stud gibbles (displacement preventing members) 3 protruding from the flange upper surface 2 are arranged along the direction Y perpendicular to the bridge axis. Is arranged. A plurality of sets of two stud gibels 3 are arranged at a predetermined interval in the bridge axis direction X of the flange upper surface 2. The pair of precast slabs 10 arranged side by side along the direction Y perpendicular to the bridge axis of the steel bridge has a recess 12 that is recessed in the end surface 14 in plan view. Each of the recesses 12 of the pair of precast floor slabs 10 is provided at a location corresponding to the two stud gibbles 3 as described later.

  Hereinafter, the configuration in the vicinity of the end face 14 of the precast slab 10 will be described. As shown in FIG. 2A, the pair of precast floor slabs 10 each have a recess 12 that is recessed in the end surface 14 in plan view. The recess 12 is recessed from the end surface 14 so as to form a substantially semicircular shape. The concave portion 12 has such a size that the entire stud dowel 3 protruding from the flange upper surface 2 of the steel beam 1 enters the concave portion 12 in plan view. Entering into the recess 12 means entering the inside of the end surface 14 when it is assumed that there is no recess 12 in the end surface 14. Each of the recesses 12 of the pair of precast floor slabs 10 faces each other.

  As shown in FIG.2 (b), in the arrangement | positioning process of the joining method of the precast floor slab which concerns on embodiment, the lower surface of a pair of precast floor slab 10 and the flange upper surface of the steel girder 1 are used using a jig | tool not shown. A pair of precast floor slabs 10 are arranged on the flange upper surface 2 so that a gap 13 of about several tens of millimeters is left between the two.

  The stud dowel 3 has a stud dowel head 4 at the top. In a cross-sectional view with a cross section perpendicular to the surface of the precast floor slab 10 and the end face 14, the stud gibber head 4 is disposed so as to enter the recess 12. The lower part of the stud gibber 3 has a thread groove, and is attached through a flange upper surface 2 of the steel beam 1 by a nut 5. Therefore, the stud gibber 3 can be removed from the steel beam 1 after the joining process in which the recess 12 is filled with a filler such as a non-shrink mortar by removing the nut 5.

  As shown in FIGS. 2A and 2B, the gap 13 between the lower surface of the pair of precast slabs 10 and the flange upper surface 2 of the steel girder 1 covers the flange upper surface 2 in plan view. In addition, the reticulated line 6 is arranged so that the reticulated line 6 is also included in the recess 12. The reticulated line 6 may be arranged at a position included in the recess 12 in both a plan view and a cross-sectional view of the precast floor slab 10.

  Further, as shown in FIG. 2 (b), a gap 13 between the lower surface of the pair of precast floor slabs 10 and the flange upper surface 2 of the steel girder 1 is flanged around the recess 12 of the pair of precast floor slabs 10. A pair of leakage prevention members 7 are arranged so as to cover from both ends of the upper surface 2. As the leakage preventing member 7, for example, a member made of a material having elasticity such as sponge or rubber can be applied. The leakage prevention member 7 may be disposed on at least one of the precast floor slab 10 and the steel beam 1. The leakage prevention member 7 may be disposed after the precast floor slab 10 is disposed on the flange upper surface 2 of the steel girder 1, and before the precast floor slab 10 is disposed on the flange upper surface 2 of the steel girder 1, It may be arranged in any of the steel girders 1.

  Alternatively, as shown in FIG. 3A, the leakage preventing member 17 is made of a sponge having a sealing function that is slightly thicker than the gap 13 between the lower surface of the precast floor slab 10 and the flange upper surface 2 of the steel girder 1. May be fixed in advance to both edge portions of the flange upper surface 2, and the leakage preventing member 17 may be fixed by placing the precast floor slab 10 and crushing the leakage preventing member 17 slightly.

  Further, when the flange upper surface 2 has a small width and the leakage prevention member 17 made of sponge is placed, the clearance (fogging) from the stud gibber 3 to the leakage prevention member 17 becomes small, as shown in FIG. As described above, an angle or the like may be welded to both edges of the flange upper surface 2 as the leakage preventing member 27.

  As shown in FIG. 4A and FIG. 4B, between the pair of precast slabs facing each other on the recess 12 and the flange upper surface 2 after the arrangement step of the precast slab joining method according to the embodiment. The gap between the lower surface of the precast floor slab 10 and the gap 13 between the flange upper surface 2 of the steel girder 1 is filled with the filler 8 so that the stud gibber 3 and the recess 12 are integrated to form a pair of precast floors. A joining step for joining the plate 10 and the steel beam 1 to each other is performed. Non-shrinking mortar, expanded concrete, or the like is applied to the filler 8, and different fillers 8 are provided for the recesses 12 and the gaps 13 between the lower surface of the precast floor slab 10 and the flange upper surface 2 of the steel girder 1. It can also be applied. For example, the recessed portion 12 can be filled with expanded concrete, and the gap 13 between the lower surface of the precast slab 10 and the flange upper surface 2 of the steel girder 1 can be filled with non-shrink mortar. In the joining process, the filler 8 is also filled into the opening 11 shown in FIG. By filling the opening 11 and the recess 12 shown in FIG. 1 with the filler 8, the bonded structure of the precast slab of this embodiment is formed.

  As described above, according to the present embodiment, when the plurality of precast floor slabs 10 are connected in the direction Y perpendicular to the bridge axis, the recess 12 and the precast floor as shown in FIGS. 4 (a) and 4 (b) described above. A structure in which the gap 13 between the lower surface of the plate 10 and the flange upper surface 2 of the steel girder 1 is filled with a filler can be obtained. Alternatively, prestress may be introduced by a post-tension method by placing a PC steel material as a tension material along the direction Y perpendicular to the bridge axis in the precast floor slab 10. Furthermore, it can also be set as the loop joint structure which constructs a joint part by placing concrete or mortar in the part which wrapped the loop reinforcement which protrudes from the edge part of the bridge-axis perpendicular direction Y of the precast floor slab.

  For example, as shown in FIG. 5, after the arrangement step of the precast floor slab joining method according to the embodiment, the bridge passes through the interior of each of a pair of precast floor slabs 10 along the direction Y perpendicular to the bridge axis. By the PC steel material 15 which is a tension material arranged so as to intersect each of the end faces 14 of the set of precast floor slabs 10 continuous along the axis perpendicular direction Y, the bridge axis perpendicular direction of the set of precast floor slabs 10 A post-axis tensioning step in which the compressive force is applied to both ends of Y is performed. The bridge axis perpendicular direction post-tensioning process is performed on the PC steel material 15 passing through the inner sheath (duct) of the pair of precast slabs 10 along the bridge axis perpendicular direction Y along the bridge axis perpendicular direction Y. Then, after applying a tensile force indicated by an arrow in the figure with a jack and fixing with the fixing tool 16, the precast floor slab 10 continuous along the bridge axis perpendicular direction Y is applied to the pair of precast floor slabs 10 along the bridge axis perpendicular direction Y. Apply compressive force.

  Thereafter, a bridge axial direction post-tensioning step for further applying a compressive force along the bridge axial direction X can be added as necessary. Moreover, also when connecting the several precast floor slab 10 to the bridge-axis direction X, the prestress introduction and loop joint structure by the post tension system mentioned above are employable.

  According to the present embodiment, in the arranging step, the end surfaces 14 of the pair of precast floor slabs 10 having the recessed portions 12 recessed in the end surface 14 in plan view are opposed to each other so as to be positioned on the flange upper surface 2 of the steel beam 1. In the joining step, the pair of precast slabs 10 and the steel girders 1 are joined together by filling the recesses 12 with the filler 8. For this reason, the flange upper surface 2 of the steel girder 1 serves as a substitute for the formwork, and a formwork for filling the filler 8 in the joining process becomes unnecessary. Further, in the arranging step, the precast floor slab 10 is parallel to the end face 14 after the joining step so that at least a part of the stud gibel 3 protruding from the flange upper surface 2 of the steel girder 1 enters the recess 12 in a plan view. Can be prevented from being displaced in the correct direction (bridge axis direction X). Therefore, when the plurality of precast floor slabs 10 are joined together, the joining operation of the precast floor slabs 10 becomes easier. In particular, in this embodiment, in order to allow the entire stud gibel 3 protruding from the flange upper surface 2 of the steel beam 1 to enter the recess 12 in plan view, the precast slab 10 is parallel to the end surface 14 after the joining step. The effect of preventing shifting in the direction is increased.

  Further, according to the present embodiment, in the arranging step, each of the recesses 12 of the pair of precast floor slabs 10 is opposed to each other. The filler 8 can be filled at the same time in a single process, and the work efficiency can be improved.

  Moreover, according to this embodiment, after a joining process, it passes along each inside of a set of precast floor slabs 10 which continued along the bridge-axis perpendicular direction Y, and a set which continued along the bridge-axis perpendicular direction Y The PC steel material 15 which is a tension material arranged so as to intersect with each of the end faces 14 of the precast floor slab 10 is connected to a set of precast floor slabs 10 which are continuous along the bridge axis perpendicular direction Y, in the direction perpendicular to the bridge axis Y. Since a post-tensioning step in the direction perpendicular to the bridge axis that applies a compressive force to the slab is further provided, bending deformation and cracking of the precast slab 10 can be suppressed.

  Moreover, according to this embodiment, since the stud gibber 3 can be removed from the steel beam 1 after the joining process, it is easy to replace the precast floor slab 10 after the joining process.

  Moreover, according to this embodiment, in each circumference | surroundings of the recessed part 12 of a pair of precast floor slab 10, at least any one of the precast floor slab 10 and the steel beam 1 is filled in a joining process before a joining process. Since the leakage preventing member 7 for preventing the leakage of the material 8 is disposed, the leakage of the filler 8 from the recess 12 can be prevented.

  Further, according to the present embodiment, in the disposing step, the reticulated line 6 is disposed so as to cover the flange upper surface 2 in a plan view and the reticulated line 6 is also included in the recess 12. In the process, the filler 8 filled in the recess 12 can be protected from cracks and the like.

  As mentioned above, although embodiment of this invention was described, this invention is implemented in various forms, without being limited to the said embodiment. For example, in the above-described embodiment, the recesses 12 of the pair of precast floor slabs 10 face each other. For example, as shown in FIG. 6, the recesses 12 of the pair of precast floor slabs 10 do not face each other. It may be arranged at a position. Each of the concave portions 12 of the pair of precast floor slabs 10 may be arranged in a staggered manner along the end surface 14, for example. Further, the shape of the recess 12 may be a triangle, a quadrilateral, or a substantially circular shape in plan view, in addition to a semicircular shape in plan view.

  Moreover, in the said embodiment, although the whole stud dowel 3 protruded from the flange upper surface 2 of the steel girder 1 was in the recessed part 12 in planar view, a part of slip prevention members, such as the stud gibel 3, were planar view. In the recess 12. For example, each of the concave portions 12 of the pair of precast floor slabs 10 is disposed at a position facing each other, and a part of one shift preventing member protruding from the flange upper surface 2 of the steel girder 1 is a pair facing each other in plan view. The precast floor slab 10 may be disposed so as to enter each of the recesses 12. Furthermore, although the said embodiment demonstrated the case where this invention was applied to a steel bridge, you may apply this invention to the concrete bridge which has a girder made from concrete. In the present embodiment, the precast floor slab 10 facing the flange upper surface 2 has been described. However, the flange upper surface of the steel girder 1 is similarly applied to the joint between the flange upper surface 2 of the steel girder 1 and the precast floor slab 10 at both ends. An anti-slip member such as a stud dowel 3 protruding from 2 is disposed.

  DESCRIPTION OF SYMBOLS 1 ... Steel girder, 2 ... Flange upper surface, 3 ... Stud gibber (slipping prevention member), 4 ... Stud gibber head, 5 ... Nut, 6 ... Reticulated streak, 7 ... Leak prevention member, 8 ... Filler, 10 ... Precast Floor slab, 11 ... opening, 12 ... recess, 13 ... gap, 14 ... end face, 15 ... PC steel, 16 ... fixing tool, 17 ... leakage prevention member (sponge), 27 ... leakage prevention member (angle), X ... Bridge axis direction, Y: Bridge axis perpendicular direction.

In addition, after the joining process, it passes through the inside of each of the continuous set of precast floor slabs of the bridge formed by the girder and the precast floor slab , and intersects each end face of the continuous set of precast floor slabs. the arranged tendons, may further include a post-tensioning step of applying a compressive force to the successive pair of precast slab.

According to this configuration, after the joining process, each of the end faces of the continuous set of precast floor slabs passes through the inside of each of the continuous set of precast floor slabs of the bridge formed by the girders and the precast floor slab. the arranged tendons to intersect, to further comprising a post-tensioning step of applying a compressive force to the successive pair of precast floor slab, is possible to reduce the bending deformation or cracking of the successive pair of precast slab it can.

Further, as shown in FIG. 2 (b), a gap 13 between the lower surface of the pair of precast floor slabs 10 and the flange upper surface 2 of the steel girder 1 is flanged around the recess 12 of the pair of precast floor slabs 10. A pair of leakage prevention members 7 are arranged so as to cover from both ends of the upper surface 2. As the leakage preventing member 7, for example, a member made of a material having elasticity such as sponge or rubber can be applied. The leakage prevention member 7 may be disposed on at least one of the precast floor slab 10 and the steel beam 1. Leakage prevention member 7 may be arranged after the precast slab 10 is placed on the flange upper surface 2 of the steel girder 1, precast slab before precast slab 10 is placed on the flange upper surface 2 of the steel girder 1 10 and the steel beam 1 may be arranged.

Further, according to this embodiment, after the bonding step, through the interior of each successive pair of precast slabs, arranged so as to intersect the respective end surfaces of the contiguous pair of precast slab tension Therefore the PC steel is wood, to further comprising a post-tensioning step of applying a compressive force to the successive pair of precast slab, it is possible to suppress the bending deformation or cracking of the precast slab.

Claims (6)

Each of the end faces of a pair of precast floor slabs having recesses recessed in the end faces in plan view is opposed to each other so as to be positioned on the upper face of the girders, and at least a part of the slip prevention member protruding from the upper face of the girders is flat. Arrangement step of arranging a pair of the precast slabs on the upper surface of the girder so as to enter the concave portion in view,
A joining method of a precast floor slab comprising: a joining step of joining a pair of the precast floor slab and the beam to each other by filling a filler in the recess.   The joining of the precast floor slabs according to claim 1, wherein in the arranging step, the pair of precast floor slabs are arranged on the upper surface of the girder so that the concave portions of the pair of precast floor slabs face each other. Method.   After the joining step, it passes through the inside of each of a set of the precast floor slabs continuous along the bridge axis perpendicular direction of the bridge formed by the girders and the precast floor slab, and along the bridge axis perpendicular direction. By means of a tension member arranged to intersect each of the end faces of the continuous set of the precast slabs, the set of continuous precast slabs along the direction perpendicular to the bridge axis is perpendicular to the bridge axis. The method for joining precast slabs according to claim 1, further comprising a post-tensioning step in a direction perpendicular to the bridge axis for applying a compressive force.   The said cast member is a joining method of the precast slab of any one of Claims 1-3 which can be removed from the said girder after the said joining process.   At least one of the precast floor slab and the girders around each of the concave portions of the pair of precast floor slabs to prevent leakage of the filler in the joining step before the joining step. The precast slab joining method according to any one of claims 1 to 4, wherein a leakage preventing member is disposed. Digits and
A pair of precast floor slabs disposed on the upper surface of the beam;
With
The girder has a detent member protruding from the upper surface,
The pair of precast slabs have recesses recessed in the end surfaces in plan view, and face each other such that each of the end surfaces of the pair of precast floor slabs is located on the upper surface of the girders, The precast slab joining structure, which is disposed on the upper surface of the girder so that at least a part of the girder is in a plan view.

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