Bedplate structure and joining method

Abstract

To provide a floor slab structure and a bonding method that are capable of obtaining necessary compressive force in a bridge axis direction.SOLUTION: A floor slab structure 1 according to one embodiment comprises: a support member 3 that extends in a bridge axial right-angled direction D2 orthogonal to a bridge axis direction D1; a plurality of precast concrete floor slabs 5 that are aligned along the bridge axis direction D1; a filling material 30 that is filled between the pair of precast concrete floor slabs 5; and a tension member 20 that is inserted, along the bridge axis direction D1, through the plurality of precast concrete floor slabs 5. Prestress by a post tension scheme is introduced, by the tension member 20, to the plurality of precast concrete floor slabs 5 continuing in the bridge axis direction D1. The floor slab structure 1 further comprises a fixing unit that is positioned outside the plurality of precast concrete floor slabs 5, in the bridge axial direction D1, to which the prestress is introduced, and fixes the tension member 20 to the precast concrete floor slab 5.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present disclosure relates to a floor slab structure including a plurality of precast concrete floor slabs arranged along the bridge axis direction, and a method for joining precast concrete floor slabs.

Background Art

[0002] Japanese Patent No. 6718658 describes a floor slab made of precast concrete. This floor slab includes a plate portion formed in a flat plate shape, a lattice rib formed on the lower surface of the plate portion, a tension member inserted through the lattice rib, and a joint portion provided at an end in the bridge axis direction. The lattice rib is a portion integrally formed with the plate portion, and is formed by a plurality of vertical ribs extending along the bridge axis direction and a plurality of horizontal ribs extending along the long side direction of the floor slab corresponding to the direction perpendicular to the bridge axis.

[0003] Prestress is introduced into each of the vertical ribs and the horizontal ribs by a tension member which is a PC steel material. Prestress by the post-tensioning method is introduced into the vertical ribs, and prestress by the pre-tensioning method is introduced into the horizontal ribs. A pipe member is embedded in the center of the cross-section of the vertical rib, and a PC steel bar as a tension member for post-tensioning is inserted into this pipe member. Both ends of the PC steel bar are fixed by nuts to a joint portion provided with a bolt box. A PC steel wire is embedded in the horizontal rib as a tension member for pre-tensioning. The PC steel wire is embedded in the cross-section of the horizontal rib and is fixed within the horizontal rib.

[0004] In this method for joining floor slabs, a floor slab in which prestress has been introduced in the direction perpendicular to the bridge axis by a PC steel wire in advance is placed on a bridge girder. The floor slab is installed in a state where the joint portions are butted against each other with other floor slabs previously placed on the bridge girder. Thereafter, prestress in the bridge axis direction is introduced using a PC steel bar. Then, a joint portion PC steel bar is inserted through a through hole formed in the joint portion, and nuts are fastened to the joint portion PC steel bar to join the floor slabs.

Prior Art Documents

Patent Document

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] In the above-described method of joining floor slabs, a pair of floor slabs are joined to each other by joining joints located at the ends in the bridge axis direction of each floor slab with joint PC steel bars. However, in this joining method, at the joint, the necessary compressive force in the bridge axis direction may be insufficient. Furthermore, the prestress that can be introduced into the joint of the floor slab by PC steel bars or bolts is limited, and it may happen that it cannot resist the negative bending (tension in the floor slab) due to the girder action.

[0007] An object of the present disclosure is to provide a floor slab structure and a joining method capable of obtaining a compressive force greater than that of the conventional method at the joint in the bridge axis direction of a precast concrete floor slab supported by a support member in which the end sides of the precast concrete floor slab are arranged in a direction perpendicular to the bridge axis.

Means for Solving the Problems

[0008] The floor slab structure according to the present disclosure includes a support member extending in a direction perpendicular to the bridge axis, which is perpendicular to the bridge axis direction; a plurality of precast concrete floor slabs extending in the height direction perpendicular to both the bridge axis direction and the direction perpendicular to the bridge axis, and arranged along the bridge axis while being supported by the support member; a filler filled between a pair of precast concrete floor slabs arranged along the bridge axis; and a tension member inserted through the plurality of precast concrete floor slabs along the bridge axis. Post-tensioning prestress is introduced by the tension member into a plurality of precast concrete floor slabs continuous in the bridge axis direction. The floor slab structure is in the bridge axis direction of the plurality of precast concrete floor slabs into which prestress is introduced Edge portionis located at and further includes a fixing portion for fixing the tension member to the precast concrete floor slab An intervening member is disposed on a support member and enters between a pair of precast concrete floor slabs. The intervening member has a first plate portion fastened to the support member by a fastening member, and a second plate portion protruding in the height direction from the first plate portion. A plurality of through holes penetrating in the bridge axis direction are formed in the second plate portion. .

[0009] In this floor slab structure, a plurality of precast concrete floor slabs are supported by support members extending in a direction perpendicular to the bridge axis so as to be arranged along the bridge axis direction, and a tension member is inserted through the plurality of precast concrete floor slabs arranged along the bridge axis direction. The tension member introduces prestress by a post-tensioning method to a plurality of precast concrete floor slabs that are continuous in the bridge axis direction while being supported by the support members extending in a direction perpendicular to the bridge axis. By introducing prestress to the plurality of precast concrete floor slabs with the tension member by the post-tensioning method, it is possible to obtain the necessary compressive force in the bridge axis direction even at the joint in the bridge axis direction. Further, since the tension member introduces prestress in a state of being inserted through a plurality of precast concrete floor slabs so as to straddle the plurality of precast concrete floor slabs, sufficient prestress can be introduced to the plurality of precast concrete floor slabs, and it is possible to resist negative bending due to girder action and the like. Furthermore, since this floor slab structure includes a fixing portion located outside the plurality of precast concrete floor slabs in the bridge axis direction, the tension member can be fixed to the precast concrete floor slab by the fixing portion.

[0010] Each of the plurality of precast concrete floor slabs may have prestress introduced in a direction perpendicular to the bridge axis by a pre-tensioning method. By the way, conventionally, a method of introducing prestress by a pre-tensioning method in both the bridge axis direction and the direction perpendicular to the bridge axis has been known. However, in the method of introducing prestress by the pre-tensioning method in two directions, special manufacturing equipment is required, which may cause problems such as the production of precast concrete floor slabs becoming complicated and the production cost increasing. In addition, in the bridge axis direction of the precast concrete floor slab, the portion where the prestress is 100% effective becomes short, so there is a situation that it is not economical to introduce prestress in the bridge axis direction by the pre-tensioning method. Therefore, as described above, when prestress is introduced in a direction perpendicular to the bridge axis by the pre-tensioning method, the production of precast concrete floor slabs can be easily and inexpensively performed.

[0011] The joining method according to the present disclosure is a joining method for joining a plurality of precast concrete floor slabs extending in the bridge axis direction, the bridge axis perpendicular direction perpendicular to the bridge axis direction, and the height direction perpendicular to both the bridge axis direction and the bridge axis perpendicular direction along the bridge axis direction. The joining method includes a step of placing a plurality of precast concrete floor slabs on a support member extending in the bridge axis perpendicular direction and supporting the plurality of precast concrete floor slabs by the support member, a step of inserting a tension member along the bridge axis direction into the plurality of precast concrete floor slabs continuous in the bridge axis direction, a step of filling a packing material between a pair of precast concrete floor slabs arranged along the bridge axis direction, a step of introducing prestress by a post-tensioning method by the tension member into the plurality of precast concrete floor slabs continuous in the bridge axis direction while being supported by the support member, and Edge portion a step of fixing the tension member to the precast concrete floor slab by a fixing portion located in the bridge axis direction of the plurality of precast concrete floor slabs into which the prestress has been introduced.

[0012] In this joining method, a plurality of precast concrete floor slabs are placed on a support member extending in a direction perpendicular to the bridge axis so as to be arranged along the bridge axis direction, and a tension member is inserted through the plurality of precast concrete floor slabs. Then, prestress is introduced into the plurality of precast concrete floor slabs continuous in the bridge axis direction by the tension member by the post-tensioning method. Therefore, similar to the floor slab structure described above, prestress along the bridge axis direction can be introduced into the plurality of precast concrete floor slabs supported by the support member extending in a direction perpendicular to the bridge axis by the post-tensioning method, so that the required compressive force in the bridge axis direction can be obtained. That is, since the tension member introduces prestress in a state of being inserted through the plurality of precast concrete floor slabs so as to straddle the plurality of precast concrete floor slabs, sufficient prestress can be introduced, and it is possible to resist negative bending and the like due to girder action. And the tension member can be fixed to the precast concrete floor slab by the fixing portion.

[0013] In this joining method, it may include an intervening member that is placed on the support member, supports a pair of precast concrete floor slabs arranged along the bridge axis direction, and enters between the pair of precast concrete floor slabs. In the step of introducing prestress, the intervening member may be slidable in the bridge axis direction with respect to the support member together with the pair of precast concrete floor slabs. This joining method may include a step of fixing the intervening member to the support member after the step of introducing prestress. In this case, when introducing prestress, since the pair of precast concrete floor slabs and the intervening member are slidable with respect to the support member, prestress can be smoothly introduced into the precast concrete floor slab. Also, after introducing prestress, by fixing the intervening member to the support member, the support member, the intervening member, the filling material, and the pair of precast concrete floor slabs can be firmly joined (integrated).

[0014] The joining method may include a step of introducing prestress into each of a plurality of precast concrete floor slabs in a direction perpendicular to the bridge axis by a pre-tensioning method. In this case, as described above, the production of the precast concrete floor slabs can be carried out easily and at low cost.

Advantages of the Invention

[0015] According to the present disclosure, the necessary compressive force in the bridge axis direction can be obtained.

Brief Description of the Drawings

[0016]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Embodiments for Carrying Out the Invention

[0017] Hereinafter, embodiments of a floor slab structure and a joining method according to the present disclosure will be described with reference to the drawings. In the description of the drawings, the same or corresponding elements are denoted by the same reference numerals, and redundant descriptions are omitted as appropriate. The drawings may be drawn with some parts simplified or exaggerated for ease of understanding, and the dimensional ratios and the like are not limited to those shown in the drawings.

[0018] Figs. 1(a) and 1(b) are perspective views showing a bridge B having a site A to which the floor slab structure 1 and the joining method according to the present embodiment are applied. As shown in Figs. 1(a) and 1(b), the bridge B includes a plurality of girders 2 extending in the bridge axis direction D1, a plurality of support members 3 extending in the direction D2 perpendicular to the bridge axis between the plurality of girders 2, and a plurality of precast concrete floor slabs 5 arranged to extend in the direction D2 perpendicular to the bridge axis on the plurality of girders 2. Note that in Figs. 1(a) and 1(b), some illustrations are simplified.

[0019] The girder 2 is, for example, a steel girder having an upper flange 2b, a web 2c, and a lower flange 2d. However, the girder 2 is not limited to a steel girder and may be, for example, a PC girder. As an example, the site A is a construction site on an expressway. For example, at the site A, renovation work of the precast concrete floor slab 5 is carried out.

[0020] The precast concrete floor slab 5 has a short side extending in the bridge axis direction D1 and a long side extending in the direction D2 perpendicular to the bridge axis, and exhibits a rectangular plate shape having a thickness in the height direction D3. The precast concrete floor slab 5 is, for example, a UFC floor slab composed of ultra high strength fiber reinforced concrete (UFC). In this case, at the site A, renovation work of the floor slab of the expressway using the UFC floor slab is carried out.

[0021] Fig. 2 is a bottom view of the precast concrete floor slab 5 as viewed from below. As shown in Fig. 2, for example, lattice ribs 5c are formed on the lower surface 5b of the precast concrete floor slab 5. The lattice ribs 5c include a plurality of ribs 5d in the bridge axis direction extending in the bridge axis direction D1 and a plurality of ribs 5f in the direction perpendicular to the bridge axis extending in the direction D2 perpendicular to the bridge axis. The precast concrete floor slab 5 having the lattice ribs 5c formed on the lower surface 5b may be referred to as a waffle type floor slab.

[0022] FIG. 3 is an enlarged longitudinal sectional view of a pair of precast concrete floor slabs 5 in the floor slab structure 1 of the present embodiment. As shown in FIG. 3, the precast concrete floor slab 5 has a plurality of PC steel materials 6 extending in the direction D2 perpendicular to the bridge axis, and prestress is introduced in the direction D2 perpendicular to the bridge axis by the pretension method. In the present embodiment, prestress is introduced into the precast concrete floor slab 5 only in the direction D2 perpendicular to the bridge axis by the pretension method.

[0023] The floor slab structure 1 includes a support member 3, an intervening member 10 disposed on the support member 3 and entering between a pair of precast concrete floor slabs 5, a tension member 20 for introducing prestress by the post-tension method into a plurality of precast concrete floor slabs 5 arranged along the bridge axis direction D1, and a filler 30 filled between the pair of precast concrete floor slabs 5.

[0024] The precast concrete floor slab 5 has an end face 5h facing the other precast concrete floor slab 5 in the bridge axis direction D1. For example, the end face 5h is planar and extends in the direction D2 perpendicular to the bridge axis and the height direction D3. The filler 30 is filled between the pair of end faces 5h. For example, the filler 30 is a cement-based material that has fluidity during filling and hardens after a certain period of time from the filling time. The filler 30 may be non-shrinking mortar, or may be placed UFC or UHPFRC (Ultra High Performance Fiber Reinforced Concrete), and various materials can be used as the filler 30.

[0025] The support member 3 is, for example, a steel cross rib extending in the direction D2 perpendicular to the bridge axis. The support member 3 has an upper flange 3b, a web 3c, and a lower flange 3d. The intervening member 10 is, for example, a perforated steel plate dibel. The intervening member 10 has a first plate portion 11 facing the upper flange 3b and a second plate portion 12 protruding from the first plate portion 11 in the height direction D3.

[0026] The first plate portion 11 is fastened to the support member 3 by, for example, a fastening member 40. As an example, the floor slab structure 1 includes a pair of fastening members 40 arranged along the bridge axis direction D1. The fastening member 40 has a bolt 41 inserted through the first plate portion 11 and the support member 3, and a nut 42 fastened to the bolt 41 passed through the first plate portion 11 and the support member 3.

[0027] For example, in a state where it is not firmly fastened by the fastening member 40 (for example, in a temporarily fastened state), the intervening member 10 is slidable in the bridge axis direction D1 with respect to the support member 3. As a specific example, elongated holes penetrating in the height direction D3 and extending in the bridge axis direction D1 are formed in each of the support member 3 and the first plate portion 11, and the intervening member 10 is slidable in the bridge axis direction D1 with the bolt 41 inserted through the elongated holes.

[0028] A plurality of through holes 13 penetrating in the bridge axis direction D1 are formed in the second plate portion 12. The plurality of through holes 13 are arranged along the direction D2 perpendicular to the bridge axis (the orthogonal direction of the paper surface in FIG. 3). For example, a tension member 20 is inserted through the through holes 13 in the bridge axis direction D1. In addition, each of the plurality of through holes 13 is filled with a plugging material 30.

[0029] Therefore, in the floor slab structure 1, the intervening member 10 and the plugging material 30 are integrated, and the pair of precast concrete floor slabs 5 and the plugging material 30 are integrated by prestress. The tension member 20 is inserted through a plurality of ribs 5f perpendicular to the bridge axis. For example, a sheath extending in the bridge axis direction D1 is embedded in each of the plurality of ribs 5f perpendicular to the bridge axis, and the tension member 20 is inserted into the inside of the sheath of each of the plurality of ribs 5f perpendicular to the bridge axis.

[0030] For example, as shown in FIGS. 4 and 5, the plurality of precast concrete floor slabs 5 include a plurality of standard panels 5A arranged along the bridge axis direction D1, end panels 5B respectively located at both ends in the bridge axis direction D1 of the plurality of standard panels 5A, and intersection fixing panels 5C located between the plurality of standard panels 5A. The tension member 20 is inserted through the plurality of precast concrete floor slabs 5 arranged along the bridge axis direction D1.

[0031] The tension member 20 is fixed by a fixing portion 25 located outside the bridge axis direction D1 of the plurality of precast concrete floor slabs 5. For example, the tension member 20 is inserted along the bridge axis direction D1 through a plurality of standard panels 5A, and one end of the tension member 20 is fixed to the fixing portion 25 at the lower part of the end panel 5B. The fixing portion 25 has, for example, a protruding portion 26 that protrudes from the lower surface of the end panel 5B and through which the tension member 20 is passed, and a fixing body 27 provided at the end of the tension member 20 passed through the protruding portion 26.

[0032] For example, the other end of the tension member 20 is fixed to the fixing portion 25 at the lower part of the cross-fixing panel 5C. As an example, the cross-fixing panel 5C has a convex portion 5g that protrudes downward in a region including the center of the bridge axis direction D1, and fixing portions 25 are provided at both ends of the convex portion 5g in the bridge axis direction D1.

[0033] Next, a method for joining the precast concrete floor slabs 5 according to the present embodiment will be described. First, the precast concrete floor slabs 5 are prepared. At this time, for example, at the manufacturing factory of the precast concrete floor slabs 5, prestress is introduced only in the direction perpendicular to the bridge axis D2 in the precast concrete floor slabs 5 by the pretensioning method.

[0034] Specifically, before the concrete constituting the precast concrete floor slab 5 hardens, a tensile force is applied only in the direction perpendicular to the bridge axis D2 by the PC steel material 6, and after the concrete hardens, the tensile force is released. In this way, a plurality of precast concrete floor slabs 5 in which prestress is introduced only in the direction perpendicular to the bridge axis D2 are prepared (the step of introducing prestress in the direction perpendicular to the bridge axis by the pretensioning method).

[0035] Then, a plurality of precast concrete floor slabs 5 are arranged on the support members 3 so as to be aligned along the bridge axis direction D1. At this time, as shown in FIGS. 1(a) and 1(b), the precast concrete floor slabs 5 are placed on the floor structure formed by the plurality of girders 2 and the plurality of support members 3, and the precast concrete floor slabs 5 are supported by the floor structure.

[0036] As a more specific example, as shown in FIG. 3, an intervening member 10 is placed on the support member 3, and a plurality of precast concrete floor slabs 5 are arranged on the intervening member 10 so as to be aligned in the bridge axis direction D1. Then, a tension member 20 is inserted through the plurality of precast concrete floor slabs 5. At this time, the tension member 20 is inserted along the bridge axis direction D1 into the sheaths of the ribs 5f in the direction perpendicular to the bridge axis of each of the plurality of precast concrete floor slabs 5 that are continuous in the bridge axis direction D1 (the step of inserting the tension member). Also, a sheath is arranged in the rib in the bridge axis direction D1 and the tension member is inserted through it.

[0037] A packing material 30 is filled between a pair of precast concrete floor slabs 5 arranged along the bridge axis direction D1 (the step of filling the packing material). At this time, the packing material 30 is filled into each through hole 13 of the intervening member 10 installed on the support member 3. After the packing material 30 has hardened, prestress is introduced into the plurality of precast concrete floor slabs 5 that are continuous in the bridge axis direction D1 by the tension member 20 by the post-tensioning method. Specifically, one end of the tension member 20 is fixed to the fixing portion 25, and a compressive force in the bridge axis direction D1 is applied to the plurality of precast concrete floor slabs 5 by pulling the other end of the tension member 20 (the step of introducing prestress by the post-tensioning method).

[0038] When prestress is introduced by the tension member 20, the intervening member 10 is not firmly fastened to the support member 3 by the fastening member 40. That is, the plurality of precast concrete floor slabs 5, the packing material 30, and the intervening member 10 are slidable with respect to the support member 3. Therefore, prestress can be introduced smoothly by sliding the intervening member 10 as the tension member 20 is tensioned.

[0039] After introducing prestress as described above, the intervening member 10 is fixed to the support member 3 by the fastening member 40 (step of fixing the intervening member), and the other end of the tension member 20 is fixed to the fixing portion 25 (step of fixing the tension member to the precast concrete floor slab by the fixing portion). Thereafter, a series of steps of the joining method according to the present embodiment are completed.

[0040] Next, the effects obtained from the floor slab structure 1 and the joining method according to the present embodiment will be described in detail. In the floor slab structure 1 and the joining method according to the present embodiment, a plurality of precast concrete floor slabs 5 arranged along the bridge axis direction D1 are supported by the support members 3 extending in the direction perpendicular to the bridge axis D2, and the tension member 20 is inserted through the plurality of precast concrete floor slabs 5 arranged along the bridge axis direction D1.

[0041] The tension member 20 introduces prestress by the post-tensioning method to the plurality of precast concrete floor slabs 5 while being supported by the support members 3 extending in the direction perpendicular to the bridge axis D2. By introducing prestress to the plurality of precast concrete floor slabs 5 by the post-tensioning method using the tension member 20, it is possible to obtain the necessary compressive force in the bridge axis direction D1 also at the joint portion in the bridge axis direction D1. In the present embodiment, by introducing prestress in the bridge axis direction D1 to the plurality of precast concrete floor slabs 5 placed on the floor assembly composed of the plurality of girders 2 extending in the bridge axis direction D1 and the plurality of support members 3 extending in the direction perpendicular to the bridge axis D2, it is possible to obtain a compressive force greater than that of the conventional method at the joint portion in the bridge axis direction D1.

[0042] Further, since the tension member 20 introduces prestress in a state of being inserted through the plurality of precast concrete floor slabs 5 so as to straddle the plurality of precast concrete floor slabs 5, sufficient prestress can be introduced to the plurality of precast concrete floor slabs 5, and it is possible to resist negative bending and the like due to the girder action. Furthermore, since the floor slab structure 1 includes the fixing portion 25 located outside the plurality of precast concrete floor slabs 5 in the bridge axis direction D1, the tension member 20 can be fixed to the precast concrete floor slab 5 by the fixing portion 25.

[0043] In this embodiment, each of the plurality of precast concrete floor slabs 5 has prestress introduced in the direction D2 perpendicular to the bridge axis by the pretension method. By the way, conventionally, a method of introducing prestress by the pretension method in both the bridge axis direction D1 and the direction D2 perpendicular to the bridge axis is known. However, in the method of introducing prestress by the pretension method in two directions, special manufacturing equipment is required, which may cause problems such as the production of precast concrete floor slabs becoming complicated and the production cost increasing.

[0044] Also, in the bridge axis direction of the precast concrete floor slab, the portion where the prestress is 100% effective becomes shorter. More specifically, as shown in FIG. 6, generally, the precast concrete floor slab has a rectangular plane that extends long in the direction D2 perpendicular to the bridge axis. In the pretension method, a region R1 where the prestress is not 100% effective is formed outside the region R2 where the prestress is 100% effective in plan view.

[0045] As an example, in a precast concrete floor slab with the length L1 in the bridge axis direction D1 being 2.5 m and the length L2 in the direction D2 perpendicular to the bridge axis being 10 m, the width W of the region R1 where the prestress is not effective is about 60 cm. In this case, the length of the region R1 where the prestress in the bridge axis direction D1 is not effective is about 1.2 m (60 cm × 2), and the ratio of the region R1 (1.2 m) to the length (2.5 m) of the precast concrete floor slab 5 in the bridge axis direction D1 is about 48%. Therefore, it is not economical to introduce prestress in the bridge axis direction D1 by the pretension method.

[0046] Therefore, when prestress is introduced only in the direction D2 perpendicular to the bridge axis by the prestressing method as in the present embodiment, the precast concrete floor slab 5 can be easily and inexpensively manufactured. In the present embodiment, the precast concrete floor slab 5 is a UFC floor slab having lattice-shaped ribs 5c on the lower surface 5b. Therefore, it is possible to obtain a light precast concrete floor slab 5 while maintaining high strength.

[0047] In the joining method according to the present embodiment, as shown in FIG. 3, an intervening member 10 is provided which is placed on the support member 3, supports a pair of precast concrete floor slabs 5 arranged along the bridge axis direction D1, and enters between the pair of precast concrete floor slabs 5. In the step of introducing prestress, the intervening member 10 is slidable in the bridge axis direction D1 with respect to the support member 3 together with the pair of precast concrete floor slabs 5.

[0048] The joining method according to the present embodiment includes a step of fixing the intervening member 10 to the support member 3 after the step of introducing prestress. Therefore, when introducing prestress, since the pair of precast concrete floor slabs 5 and the intervening member 10 are slidable with respect to the support member 3, prestress can be smoothly introduced into the precast concrete floor slab 5. Further, after introducing the prestress, the intervening member 10 is fixed to the support member 3. From the above, the filler 30 and the intervening member 10 are integrated, and the pair of precast concrete floor slabs 5 and the filler 30 can be integrated by prestress.

[0049] The embodiments of the floor slab structure and the joining method according to the present disclosure have been described above. However, the floor slab structure and the joining method according to the present disclosure are not limited to the above-described embodiments, and can be appropriately modified within the scope of the gist described in the claims. That is, the structure, shape, size, material, number and arrangement mode of each part of the floor slab structure, and the content and order of the steps of the joining method can be appropriately changed within the scope of the above gist.

[0050] In the foregoing embodiment, an example in which the intervening member 10 slides with respect to the support member 3 has been described. For example, a member made of a low-friction material such as Teflon (registered trademark) may be interposed between the support member 3 and the intervening member 10. Further, the fixing means of the intervening member 10 to the support member 3 is not limited to only the fastening member 40 described above. For example, the intervening member 10 may be fixed by welding or an adhesive to the fastening member 40.

[0051] In the foregoing embodiment, an example in which the intervening member 10 is a perforated steel sheet doubler has been described. However, the intervening member may be other than a perforated steel sheet doubler. For example, it may be a stud (stud doubler) with a head. That is, various members can be used as the intervening member as long as it can be integrated with the filler between a pair of precast concrete floor slabs.

[0052] In the foregoing embodiment, an example in which prestress is introduced in the direction D2 perpendicular to the bridge axis in a pre-tensioning method at the manufacturing plant of the precast concrete floor slab 5 has been described. However, prestress by a post-tensioning method may be introduced at a location other than the manufacturing plant of the precast concrete floor slab 5 (for example, the site A).

[0053] In the foregoing embodiment, an example in which the end face 5h of the precast concrete floor slab 5 facing the other precast concrete floor slab 5 in the bridge axis direction D1 is planar has been described. However, unevenness may be formed on the end face 5h of the precast concrete floor slab 5 facing the other precast concrete floor slab 5 in the bridge axis direction D1. In this case, a pair of precast concrete floor slabs 5 can be integrated more firmly.

[0054] In the foregoing embodiment, the precast concrete floor slab 5 which is a waffle-type floor slab in which the lattice-shaped ribs 5c are formed on the lower surface 5b has been described. However, the precast concrete floor slab may be a precast concrete floor slab in which the lattice-shaped ribs 5c are not formed, and the type of the precast concrete floor slab can be changed as appropriate.

Description of Signs

[0055] 1... Floor slab structure, 2... Girder, 2b... Upper flange, 2c... Web, 2d... Lower flange, 3... Support member, 3b... Upper flange, 3c... Web, 3d... Lower flange, 5... Precast concrete floor slab, 5A... Standard panel, 5b... Lower surface, 5B... End panel, 5c... Lattice rib, 5C... Cross fixing panel, 5d... Rib in the bridge axis direction, 5f... Rib perpendicular to the bridge axis direction, 5g... Protrusion, 5h... End face, 6... PC steel material, 10... Intervening member, 11... First plate part, 12... Second plate part, 13... Through hole, 20... Tension member, 25... Fixing part, 26... Protruding part, 27... Fixing body, 30... Filling member, 40... Fastening member, 41... Bolt, 42... Nut, A... Construction site, B... Bridge, D1... Bridge axis direction, D2... Direction perpendicular to the bridge axis, D3... Height direction, L1, L2... Length, R1, R2... Region, W... Width.

Claims

1. A support member extending in a direction perpendicular to the bridge axis direction; A plurality of precast concrete floor slabs extending in the height direction perpendicular to both the bridge axis direction and the direction perpendicular to the bridge axis direction, and arranged along the bridge axis direction while being supported by the support member; A filling material filled between a pair of the precast concrete floor slabs arranged along the bridge axis direction; A tension member inserted through the plurality of precast concrete floor slabs along the bridge axis direction; Comprising; Prestress by the post-tensioning method is introduced to the plurality of precast concrete floor slabs continuous in the bridge axis direction by the tension member; Located at the edge portion in the bridge axis direction of the plurality of precast concrete floor slabs into which the prestress is introduced, and further comprising a fixing portion for fixing the tension member to the precast concrete floor slab; Comprising an intervening member disposed on the support member and entering between a pair of the precast concrete floor slabs; The intervening member has a first plate portion fastened to the support member by a fastening member, and a second plate portion protruding from the first plate portion in the height direction; A plurality of through holes penetrating in the bridge axis direction are formed in the second plate portion; Floor slab structure.

2. Each of the plurality of precast concrete floor slabs has prestress introduced in the direction perpendicular to the bridge axis by the pre-tensioning method; The floor slab structure according to Claim 1.

3. A joining method for joining a plurality of precast concrete floor slabs extending in the bridge axis direction, the direction perpendicular to the bridge axis direction, and the height direction perpendicular to both the bridge axis direction and the direction perpendicular to the bridge axis direction along the bridge axis direction, comprising: A step of placing a plurality of the precast concrete floor slabs on a support member extending in the direction perpendicular to the bridge axis direction and supporting the plurality of precast concrete floor slabs by the support member; A step of inserting a tension member along the bridge axis direction through a plurality of the precast concrete floor slabs continuous in the bridge axis direction; A step of filling a filling material between a pair of the precast concrete floor slabs arranged along the bridge axis direction; A step of introducing prestress by the post-tensioning method to the plurality of precast concrete floor slabs continuous in the bridge axis direction while being supported by the support member by the tension member; A step of fixing the tension member to the precast concrete floor slab by a fixing portion located at an edge portion in the bridge axis direction of the plurality of precast concrete floor slabs into which the prestress is introduced; A joining method comprising the same.

4. Comprising an intervening member that is placed on the support member, supports a pair of the precast concrete floor slabs arranged along the bridge axis direction, and enters between the pair of the precast concrete floor slabs; In the step of introducing the prestress, the intervening member is slidable in the bridge axis direction with respect to the support member together with the pair of the precast concrete floor slabs; After the step of introducing the prestress, a step of fixing the intervening member to the support member is provided. The joining method according to claim 3.

5. Each of the plurality of precast concrete floor slabs includes a step of introducing prestress in a direction perpendicular to the bridge axis by a pretension method. The joining method according to claim 3 or 4.

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