JP2019183481A - Joining structure of composite floor slabs - Google Patents

Abstract

To provide a joining structure of composite floor slabs in which joint members between floor slabs prevent an unnecessary increase in the thickness of the floor slabs and the joint members can be arranged without depending on the position of floor slab reinforcing bars.SOLUTION: There is provided a joining structure of composite floor slabs in which a pair of end plates 5 extending upward from a bottom plate 2 are provided at both ends in the bridge axial direction of each composite floor slab 1, a plurality of joint members 6 protruding between end surfaces of each composite floor slab 1 are provided to each end plate 5, filling concrete is filled between the end plates 5 of the composite floor slabs 1 adjacent to each other, so that the vertical size of each joint member 6 can be reduced compared to that of the joint member in which upper and lower reinforcement bars are bent in a loop-shape conventionally. Moreover, since each joint member 6 is provided independently from floor slab reinforcing bars (distribution reinforcement bars 7), each joint member 6 can be arranged without depending on the position of each distribution reinforcement bar 7.SELECTED DRAWING: Figure 12

Description

  The present invention relates to a joint structure of a synthetic floor slab used for erection of a viaduct such as a general road or a highway.

  Conventionally, in this type of viaduct construction, for example, a steel floor plate manufactured at a factory is fixed on the main girder on site, and a reinforcing bar is placed on it and concrete is placed to construct a composite slab. What was made to do is known (for example, refer patent document 1). However, the method of placing concrete on the entire floor slab at the site requires the placement of concrete and the curing period (28 days), which causes problems such as traffic congestion and prolonged construction periods.

  Therefore, the precast floor slab made in advance in the factory is laid on the main girder on the site, and the concrete is placed in the space between the floor slab end faces, thereby improving the efficiency of site construction and shortening the construction period. There is known one (see Patent Document 2, for example). In this method, a plurality of joint members extending from the end face of the floor slab into the padding portion are provided to secure the load transmission force between the floor slabs, and each floor slab is connected to the padded concrete by each joint member. I try to increase the strength.

Japanese Patent No. 4106317 Japanese Patent No. 5337122

  By the way, in the construction method of laying the precast floor slab on the main girder on site as described above, as the joint member, for example, the reinforcing bar arranged on the upper side in the floor slab body and the reinforcing bar arranged on the lower side are the floor slab body. A material extending from the end face and continuing in a loop shape is used. However, since this loop-shaped part is formed by bending a reinforcing bar, the distance between the upper and lower reinforcing bars is equal to the diameter of the loop-shaped part. There is a limit on the bending strength. For this reason, even when the space between the upper and lower reinforcing bars is smaller than the diameter of the loop-shaped part under the floor slab design conditions, it must match the diameter of the loop-shaped part, and the floor slab thickness is required. More than that. As a result, there is a problem in that the load on the main girder due to the weight of the floor slab and the amount of concrete used in the floor slab body are unnecessarily increased.

  In addition, when the end of a reinforcing bar arranged in the floor slab body is used as a joint member, the position of the joint reinforcing bar depends on the position of the reinforcing bar for the floor slab, so there is a problem that the placement of the joint member is restricted. It was.

  The present invention has been made in view of the above problems, and the object thereof is not to unnecessarily increase the floor slab thickness by the joint member between the floor slabs, and to the position of the reinforcing bars for the floor slabs. An object of the present invention is to provide a composite floor slab joining structure in which joint members can be arranged without depending on each other.

  In order to achieve the above object, the present invention fills a space between the end faces of a composite floor slab formed by placing reinforcing bars on a steel bottom plate and placing concrete, thereby providing a plurality of composite floors. In the joint structure of the composite floor slabs that are joined to each other, end plates extending upward from the bottom plate are provided at both ends in a predetermined direction of the composite floor slab, and each end plate is provided between the end surfaces of the composite floor slab. A plurality of protruding joint members are provided.

  As a result, since each joint member is provided on the end plate, the size in the vertical direction of each joint member is smaller than that of a joint member in which the upper and lower reinforcing bars are bent in a loop shape as in the prior art. Therefore, the floor slab thickness is not restricted. Moreover, since each joint member is provided independently from the reinforcing bar for floor slabs, the position of each joint member does not depend on the position of the reinforcing bars for floor slab.

  According to the present invention, since the vertical dimension of each joint member can be reduced compared to the conventional joint member in which the upper and lower reinforcing bars are bent in a loop shape, the floor slab thickness according to the vertical dimension of the joint member can be reduced. The floor slab can be designed without restrictions, and there is an advantage that the load on the main girder due to the weight of the floor slab and the concrete usage amount of the floor slab body are not increased unnecessarily. In addition, since each joint member is provided independently of the reinforcing bar for the floor slab, each joint member can be arranged without depending on the position of the reinforcing bar for the floor slab. Can be provided in position.

The top view of the composite floor slab which shows one Embodiment of this invention Side view of composite floor slab Plan view showing a part of the composition of the composite floor slab Plan view showing a part of the composition of the composite floor slab Perspective view showing the configuration of part of the composite floor slab Side sectional view showing the joining process of synthetic floor slab Side sectional view showing the joining process of synthetic floor slab Side sectional view showing the joining process of synthetic floor slab Side sectional view showing the joining process of synthetic floor slab Side sectional view showing the joining process of synthetic floor slab Plan view showing the joining process of composite floor slab The perspective view which shows the joining process of a synthetic floor slab

  FIG. 1 to FIG. 12 show an embodiment of the present invention, which shows a joint structure of a synthetic floor slab used for erection of a viaduct used for, for example, a general road or a highway.

  The composite floor slab 1 shown in FIG. 1 includes a steel bottom plate 2 that forms the bottom surface of the floor slab body, a plurality of intermediate plates 3 that are fixed on the bottom plate 2 at intervals in the bridge axis direction, and intermediate plates 3. A plurality of pipes 4 as rod-like members arranged so as to pass through, a pair of end plates 5 fixed to both ends of the bottom plate 2, a plurality of joint members 6 provided on each end plate 5, A plurality of distribution reinforcing bars 7 arranged on the bottom plate 2, a plurality of main reinforcing bars 8 arranged on the bottom plate 2, and a concrete portion 9 placed on the bottom plate 2.

  The bottom plate 2 is made of a flat steel plate, and a plurality of bolt insertion holes 2a through which bolts for connecting to other floor slabs are provided at both ends in the bridge axis direction. The bolt insertion holes 2a are arranged at intervals in the direction perpendicular to the bridge axis and are provided so as to penetrate the bottom plate 2 in the thickness direction.

  Each intermediate plate 3 is made of a horizontally long steel plate extending from one end to the other end in the width direction (the direction perpendicular to the bridge axis) of the bottom plate 2, and is fixed to the upper surface of the bottom plate 2 by welding so as to be perpendicular to the bottom plate 2. Has been. The intermediate plate 3 is provided with a plurality of pipe insertion holes 3a through which the pipes 4 are inserted, and the pipe insertion holes 3a are provided at intervals in a direction perpendicular to the bridge axis. Each pipe insertion hole 3a is formed in a horizontally long slot shape, and is provided so as to penetrate the intermediate plate 3 in the thickness direction.

  Each pipe 4 is made of a steel pipe extending in the bridge axis direction, and is arranged at intervals in the direction perpendicular to the bridge axis. Each pipe 4 is inserted through a pipe insertion hole 3 a of each intermediate plate 3.

  Each end plate 5 is made of a horizontally long steel plate extending from one end to the other end in the width direction of the bottom plate 2, and is fixed to the upper surface of the bottom plate 2 by welding so as to be perpendicular to the bottom plate 2. In this case, the end portion side of the bottom plate 2 extends outward from the end plate 5, and the bolt insertion hole 2 a is disposed in the extended portion. In addition, a plurality of studs 5a serving as displacement preventing members extending in the bridge axis direction are provided on one surface in the thickness direction of each end plate 5, and the studs 5a are arranged at intervals in a direction perpendicular to the bridge axis. ing. Each stud 5a is made of a shaft-like member having one end fixed to the back surface of the end plate 5 by welding or the like, and a head enlarged in the radial direction is provided at the other end.

  Each joint member 6 connects the base end side member 6a which forms the base end side of the joint member 6, the front end side member 6b which forms the front end side of the joint member 6, and the base end side member 6a and the front end side member 6b. The connecting member 6c is provided on the other surface in the thickness direction of the end plate 5 so as to be located on the opposite side of each stud 5a. The base end side member 6a is made of a shaft-like member on which a male screw is formed, and one end is fixed to the outer surface in the thickness direction of the end plate 5 by welding. The distal end side member 6b is made of a shaft-like member on which a male screw is formed, and a head similar to a bolt is formed at the other end. The connecting member 6c is made of a high nut, and one end side is screwed to the other end side of the proximal end side member 6a, and the other end side is screwed to the other end side of the distal end side member 6b. And the front end side member 6b are connected.

  Each of the distribution reinforcing bars 7 is composed of reinforcing bars that extend in a straight line from one end side to the other end side in the longitudinal direction (bridge axis direction) of the bottom plate 2, and are arranged at intervals in a direction perpendicular to the bridge axis. Each of the distribution reinforcing bars 7 is disposed above the end plate 5, and both end sides thereof extend outside the end plate 5.

  Each main reinforcing bar 8 is composed of reinforcing bars that extend in a straight line from one end to the other end in the width direction of the bottom plate 2 (in the direction perpendicular to the bridge axis), and is arranged at intervals in the bridge axis direction. Further, each main reinforcing bar 8 is arranged above each distribution reinforcing bar 7. When the floor slab thickness is thin, the main reinforcing bar 8 may be disposed below the distribution reinforcing bar 8 in order to secure the reinforcing bar cover.

  The concrete portion 9 is cast using a formwork at a factory or the like, and a floor slab portion extending over the entire width of the bottom plate 2 is formed between the end plates 5. In this case, each intermediate plate 3, each pipe 4, each stud 5a, each distribution reinforcing bar 7, and each main reinforcing bar 8 are embedded in the concrete part 9, and each end plate 5 is a part of the formwork when placing concrete. Also used as

  The composite floor slab 1 configured as described above is manufactured at a factory or the like, and then transported to a construction site and joined to another composite floor slab 1. Each joint member 6 is not mounted with the distal end side member 6b and the connecting member 6c on the proximal end side member 6a at the time of carrying out the factory, and these are mounted on the site as will be described later.

  The composite floor slab 1 carried into the site is installed side by side in the bridge axis direction on a main girder (not shown). At that time, as shown in FIG. 6, the bottom plates 2 of the composite floor slab 1 are abutted in the direction of the bridge axis with a slight gap, and between the end plates 5 of each composite floor slab 1, A gap is formed. Next, the attachment plate 10 is disposed on the upper surface of the end portion of each bottom plate 2, and the bottom plates 2 are connected to each other by the attachment plate 10 by high strength bolts 11 and nuts 12 as shown in FIG. 7. The attachment plate 10 is made of a horizontally long steel plate extending from one end to the other end in the width direction (the direction perpendicular to the bridge axis) of the bottom plate 2, and a plurality of bolt insertion holes 10 a through which the high-strength bolts 11 are inserted are mutually connected to the bottom plate 2. Two rows are provided at intervals in the width direction. In this case, the high-strength bolts 11 are inserted into the bolt insertion holes 2a of the bottom plate 2 and the bolt insertion holes 10a of the attachment plate 10 from below, and the nuts 12 are screwed onto the high-strength bolts 11 from above so that each bottom plate 2 and The joining plate 10 is fastened. At that time, since the distal end side member 6b and the connecting member 6c are not mounted on the proximal end side member 6a of the joint member 6, the distal end side member 6b and the connecting member 6c obstruct the fastening operation of the high strength bolt 11. There is no.

  Next, as shown in FIG. 8, the distal end side member 6 b and the connecting member 6 c are attached to the proximal end side member 6 a of the joint member 6 of each composite floor slab 1, and the vertical direction from the end plate 5 toward the inside of the padding portion 1 a is performed. A plurality of joint members 6 projecting from each other are formed. In this case, the composite floor slabs 1 adjacent to each other do not interfere with each other because the positions of the joint members 6 are staggered in the width direction of the bottom plate 2.

  Thereafter, as shown in FIG. 9, a plurality of first reinforcing reinforcing bars 13 extending in the bridge axis direction and a plurality of second reinforcements extending in the direction perpendicular to the bridge axis are provided in the space 1 a between the composite floor slabs 1. Reinforcing bars 14 are arranged. The first reinforcing reinforcing bars 13 are arranged at intervals in the direction perpendicular to the bridge axis, and the second reinforcing reinforcing bars 14 are arranged at intervals in the bridge axis direction. In this case, each second reinforcing bar 14 is disposed below each first reinforcing bar 13 and is previously bound to each first reinforcing bar 13. The reinforcing reinforcing bars 13 and 14 assembled in a lattice manner in this way are interspersed by placing the second reinforcing reinforcing bars 14 on the end portions of the distribution reinforcing bars 7 protruding into the interposing part 1a. It arrange | positions in the part 1a. Further, as shown in FIG. 11, in one composite floor slab 1 and the other composite floor slab 1 adjacent to each other, the positions of the joint members 6 are shifted by a half pitch in the direction perpendicular to the bridge axis. In the part 1a, each joint member 6 on one composite floor slab 1 side and each joint member 6 on the other composite floor slab 1 side are arranged in a staggered manner. That is, a plurality of composite floor slabs 1 in which the positions of the joint members 6 are shifted in the direction perpendicular to the bridge axis are alternately arranged in the direction perpendicular to the bridge axis.

  Subsequently, as shown in FIG. 10, the space-filled concrete 15 is placed by filling the space-filled portion 1 a with, for example, fast-hardening concrete as a space-filling material. As a result, the bond strength between each composite floor slab 1 and the interstitial concrete 15 is increased by the adhesion force and the supporting pressure (force against the horizontal shearing force) generated between the joint members 6 and the interstitial concrete 15. It is done. In that case, since each joint member 6 is provided in the end plate 5 in a stud shape, the dimension in the vertical direction of each joint member 6 is larger than that of a joint member in which upper and lower reinforcing bars are bent in a loop shape as in the prior art. The floor slab thickness is not restricted by each joint member 6. Moreover, since each joint member 6 is provided independently from the reinforcing bar for floor slab (distribution reinforcing bar 7), the position of each joint member 6 does not depend on the position of each distribution reinforcing bar 7. .

  As described above, according to the present embodiment, the pair of end plates 5 extending upward from the bottom plate 2 are provided at both ends in the bridge axis direction of the composite floor slab 1, and each end plate 5 has the composite floor slab 1. Since a plurality of joint members 6 projecting between the end surfaces are provided and the interstitial concrete 15 is filled between the end plates 5 of the adjacent composite floor slabs 1, the upper and lower reinforcing bars are bent in a loop shape as in the past. Compared with the joint member, the vertical dimension of each joint member 6 can be made extremely small. As a result, the floor slab can be designed without being restricted by the floor slab thickness due to the vertical dimension of the joint member, so the load on the main girder due to the weight of the floor slab and the amount of concrete used in the floor slab body are unnecessarily increased. There is an advantage of not letting it.

  In addition, since each joint member 6 is provided independently of the slab reinforcement (distribution reinforcing bar 7), it is possible to dispose each joint member 6 without depending on the position of each distribution reinforcement 7. Each joint member 6 can be provided at an optimum position. In the present embodiment, the positions of the joint members 6 and the distribution reinforcing bars 7 are different in the vertical direction but coincide with each other in the arrangement direction (the direction perpendicular to the bridge axis). It is possible to arrange | position so that it may differ from the position of each distribution reinforcing bar 7.

  Furthermore, each joint member 6 includes a base end side member 6a that forms the base end side of the joint member 6, a front end side member 6b that forms the front end side of the joint member 6, a base end side member 6a, and a front end side member 6b. Since the base end side member 6a is fixed to the end plate 5 and the tip end side member 6b and the connection member 6c are detachably provided on the base end side member 6a. Until the fastening operation of the bolt 11 is completed, the distal end side member 6b and the connecting member 6c are removed and attached after the fastening operation of the high strength bolt 11, so that the distal end side member 6b and the connecting member 6c are connected to the high strength bolt 11. The fastening work of the high-strength bolt 11 can be performed efficiently without hindering the fastening work.

  In addition, since the one adjacent composite floor slab 1 and the other composite floor slab 1 are formed such that the positions of the joint members 6 are shifted from each other in the direction perpendicular to the bridge axis, the interval between the end plates 5 in the padding portion 1a. Even if the width is narrowed, the joint members 6 of the composite floor slabs 1 do not interfere with each other, and the padding portion 1a can be made small.

  Furthermore, the composite floor slab 1 has a concrete portion 9 formed in advance by placing concrete between the end plates 6 at a factory or the like, so it is necessary to place concrete excluding the interstitial portion 1a on site. In addition, it is possible to improve the efficiency of on-site construction and shorten the construction period. In this case, since the end plates 6 can be used as molds when placing concrete between the end plates 6, the concrete portion 9 can be formed efficiently.

  Moreover, since the plurality of studs 5a embedded in the concrete portion 9 are provided on the other surface in the thickness direction of each end plate 5, the separation between each end plate 5 and the concrete portion 9 is prevented by each stud 5a. In addition, the tensile load in the bridge axis direction between the composite floor slabs 1 can be transmitted to the concrete portion 9 and the reinforcing bars 7 and 8 inside thereof through the studs 5a. Thereby, since each end plate 5 contributes to the stress transmission between each synthetic floor slab 1 not only by the joint member 6 but by the stud 5a, the joint strength of each synthetic floor slab 1 can be raised more.

  Further, the composite floor slab 1 is arranged between the end plates 6 with a plurality of intermediate plates 3 spaced apart from each other in the bridge axis direction, and spaced apart from each other in the direction perpendicular to the bridge axis. Each intermediate plate 3 is fixed to the bottom plate 2, and each pipe 4 is inserted through the pipe insertion hole 3 a of each intermediate plate 3. The joint strength between the bottom plate 2 and the concrete portion 9 can be increased by the pipes 4, and the amount of concrete can be reduced by the hollow portions of the pipes 4, thereby reducing the weight.

  In each of the above embodiments, the composite floor slabs 20 are joined in the direction of the bridge axis, but can also be applied to the case of joining in the direction perpendicular to the bridge axis.

  Moreover, in each said embodiment, although what provided part (tip side member 6b and connecting member 6c) of the joint member 6 so that attachment or detachment was shown, you may make it attach and detach the whole joint member. For example, a nut can be fixed to the end plate by welding or the like, or a female thread portion can be formed on the end plate itself, and a joint member made of a bolt can be screwed together.

  Furthermore, in each said embodiment, although the thing using the pipe 4 was shown as a rod-shaped member which penetrates the pipe penetration hole 3a of each intermediate | middle board 3, a rod-shaped member other than a pipe can also be used.

  In each of the above embodiments, each end plate 5 is provided with a plurality of studs 5a as displacement preventing members. Instead of the stud 5a, a plate-like member having a hole penetrating in the thickness direction is used. You may make it provide as a slip prevention member.

  DESCRIPTION OF SYMBOLS 1 ... Synthetic floor slab, 1a ... Packing part, 2 ... Bottom plate, 3 ... Intermediate plate, 4 ... Pipe, 5 ... End plate, 5a ... Stud, 6 ... Joint member, 6a ... Base end side member, 6b ... Tip side Member: 6c: Connecting member, 7: Distribution reinforcing bar, 8: Main reinforcing bar, 9: Concrete part, 15: Filled concrete.

Claims (8)

A composite floor slab in which reinforcing materials are placed on the bottom plate made of steel and a concrete filler is placed between the end faces of the composite floor slab. In the joining structure of
An end plate extending upward from the bottom plate is provided at both ends in a predetermined direction of the composite floor slab,
A joint structure of composite floor slabs, wherein a plurality of joint members projecting between the end faces of the composite floor slab are provided on one surface in the thickness direction of each end plate. The joint structure of a composite floor slab according to claim 1, wherein at least a part of the joint member is detachable. The joint member is formed of a base end side member that forms the base end side of the joint member, a tip end side member that forms the tip end side of the joint member, and a connecting member that connects the base end side member and the tip end member, The joint structure of the composite floor slab according to claim 2, wherein the base end side member is fixed to the end plate. The one composite floor slab and the other composite floor slab adjacent to each other are formed such that the positions of the joint members are shifted from each other in a direction orthogonal to the predetermined direction. Composite floor slab joint structure. The joint structure of the composite floor slab according to claim 1, 2, 3 or 4, wherein the composite floor slab is formed with a concrete portion in advance by placing concrete between end plates. The joint structure for composite floor slabs according to claim 5, wherein a displacement preventing member embedded in the concrete portion is provided on the other surface in the thickness direction of each end plate. The composite floor slab is disposed between each end plate with a plurality of intermediate plates spaced from each other in the predetermined direction, and spaced apart from each other in a direction orthogonal to the predetermined direction. A plurality of bar-like members extending, each intermediate plate is fixed to the bottom plate, and each bar-like member is inserted into a hole provided in each intermediate plate. Composite floor slab joint structure. Each said rod-shaped member consists of steel pipes. The joint structure of the composite floor slab of Claim 7 characterized by the above-mentioned.

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