Joint and floor slab joining structure

Abstract

To provide a joint and a floor slab joining structure capable of suppressing displacement of a floor slab and improving workability.SOLUTION: The joint includes a first contact member and a second contact member each having a first support portion that supports a loop portion of the loop reinforcement protruding from one of the precast floor slabs and a second support portion that supports a loop portion of the loop reinforcement protruding from the other of the precast floor slabs, and a connection mechanism that integrally connects the first contact member and the second contact member in a linear direction and has an adjustment mechanism capable of adjusting a distance between the first contact member and the second contact member in the linear direction.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a joint and a deck slab joining structure. [Background technology]

[0002] BACKGROUND ART A deck slab joint structure for joining a plurality of precast decks together is known (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 8-27733 Summary of the Invention [Problem to be solved by the invention]

[0004] The deck joint structure described in Patent Document 1 is configured to connect opposing precast decks by engaging a connecting member between loop reinforcing bars protruding from the sides of the decks. In this configuration, the two loop reinforcing bars that engage the connecting member are positioned offset along the plane of the precast deck. This causes the tension of the tension member to act in an inclined direction along the plane of the precast deck when viewed from above, which could cause the precast deck to shift. Furthermore, the above deck joint structure is required to reduce the effort required to engage the connecting member and improve workability.

[0005] The present invention has been made in consideration of the above, and aims to provide a joint and deck slab joining structure that can suppress deck slab misalignment and improve workability. [Means for solving the problem]

[0006] The joint of the present invention is a joint that connects loop reinforcement bars that protrude toward each other from each precast floor slab and are arranged so that their loop portions overlap at the joint between the precast floor slabs, and is equipped with a first contact member and a second contact member, each having a first support portion that supports the loop portion of the loop reinforcement bar protruding from one of the precast floor slabs and a second support portion that supports the loop portion of the loop reinforcement bar protruding from the other precast floor slab, and a connecting mechanism that integrally connects the first contact member and the second contact member in a linear direction and has an adjustment mechanism that can adjust the distance between the first contact member and the second contact member in the linear direction.

[0007] The deck joint structure of the present invention comprises two precast decks that are joined together, each having a plurality of loop reinforcements that protrude in a first direction and are aligned in a second direction perpendicular to the first direction, with the loop portions of the loop reinforcements arranged to overlap in the first direction, and the above-mentioned joint that is arranged at the joint between the two precast decks and connects corresponding loop reinforcements to each other. [Effects of the Invention]

[0008] According to the present invention, a joint and a deck slab joining structure are provided that can suppress deck slab displacement and improve workability. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a diagram (plan view) that schematically shows an example of a deck slab joint structure according to this embodiment. [Figure 2] FIG. 2 is a diagram (side view) that schematically shows an example of the deck slab joint structure according to this embodiment. [Figure 3] FIG. 3 is a diagram (plan view: partially enlarged view) that schematically shows an example of a deck slab joint structure according to this embodiment. [Figure 4] FIG. 4 is a diagram (side view: partially enlarged view) that schematically shows an example of a deck slab joint structure according to this embodiment. [Figure 5]FIG. 5 is a diagram (perspective view) showing an example of a joint according to this embodiment. [Figure 6] FIG. 6 is a diagram (cross-sectional view) showing an example of a joint according to this embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, embodiments of the joint and deck slab joining structure according to the present invention will be described with reference to the drawings. Note that the present invention is not limited to these embodiments. Furthermore, the components in the following embodiments include those that are easily replaceable by those skilled in the art, or those that are substantially identical.

[0011] Figures 1 to 4 are diagrams schematically showing an example of a deck slab joining structure according to this embodiment. Figure 1 is a plan view, and Figure 2 is a side view. Figure 3 is an enlarged view of the joint portion in Figure 1, and Figure 4 is an enlarged view of the joint portion in Figure 2. The deck slab joining structure 100 shown in Figures 1 to 4 can be applied, for example, when joining multiple precast decks installed on main girders. In this embodiment, two precast decks PC adjacent in the joining direction (hereinafter referred to as the first direction D1) will be described as a first precast deck 10 and a second precast deck 20.

[0012] As shown in FIG. 1, the deck slab joint structure 100 includes a first precast deck 10, a second precast deck 20, and a joint 30. The deck slab joint structure 100 joins the first precast deck 10 and the second precast deck 20 at a joint portion 40. In the following description, the first direction D1 is a direction along a horizontal plane. Furthermore, in the following description, when explaining the directions of the deck slab joint structure 100 and the joint 30, in addition to the first direction D1, a direction along a horizontal plane that is perpendicular to the first direction D1 is referred to as a second direction D2, and a direction (up-down direction, vertical direction) that is perpendicular to both the first direction D1 and the second direction D2 is referred to as a third direction D3.

[0013] The first precast floor slab 10 has a main body 11 and a plurality of loop reinforcements 12. The main body 11 is formed in a plate or block shape using, for example, concrete. The plurality of loop reinforcements 12 are arranged on a side surface 11a of the main body 11. The plurality of loop reinforcements 12 protrude from the side surface 11a in a first direction D1. In other words, the loop reinforcements 12 protrude toward a side surface 21a of a second precast floor slab 20, which will be described later.

[0014] Each loop reinforcement 12 has a straight portion 12a and a loop portion 12b. Two straight portions 12a are arranged on the side surface 11a of each loop reinforcement 12, spaced apart in the vertical direction (third direction D3). The straight portions 12a are embedded in the main body 11 of the first precast deck 10, and extend so that a portion of them protrudes from the side surface 11a along the first direction D1. The loop portions 12b connect the tips of the straight portions 12a in the protruding direction. The loop portions 12b have a curved shape that is convex in the protruding direction of the loop reinforcement 12.

[0015] The second precast floor slab 20 has a main body 21 and a plurality of loop reinforcements 22. The main body 21 is formed in a plate or block shape using, for example, concrete. The plurality of loop reinforcements 22 are arranged on a side surface 21a of the main body 21. The side surface 21a faces the side surface 11a of the main body 11 of the first precast floor slab 10. The plurality of loop reinforcements 22 protrude from the side surface 21a in the first direction D1. In other words, the loop reinforcements 22 protrude toward the side surface 11a of the first precast floor slab 10.

[0016] Each loop reinforcement 22 has a straight portion 22a and a loop portion 22b. Two straight portions 22a are arranged on the side surface 21a of each loop reinforcement 22, spaced apart in the vertical direction (third direction D3). The straight portions 22a are embedded in the main body 21 of the second precast floor slab 20, and extend so that a portion of them protrudes from the side surface 21a along the first direction D1. The loop portion 22b connects the tips of the straight portions 22a in the protruding direction. The loop portion 22b has a curved shape that is convex in the protruding direction of the loop reinforcement 22.

[0017] The first precast floor slab 10 and the second precast floor slab 20 are arranged such that the loop reinforcement bars 12 and the loop reinforcement bars 22 are alternately arranged in the second direction D2, and the loop portions 12b of the loop reinforcement bars 12 and the loop portions 22b of the loop reinforcement bars 22 overlap when viewed from the second direction D2. This arrangement forms a circular or oval lap portion 50 (see Figure 4) surrounded by the loop portions 12b and 22b when viewed from the second direction D2.

[0018] The joints 30 are arranged in the lap portion 50 formed by the loop reinforcement 12 of the first precast floor slab 10 and the loop reinforcement 22 of the second precast floor slab 20. One joint 30 is arranged between one loop reinforcement 12 of the first precast floor slab 10 and one loop reinforcement 22 of the second precast floor slab 20. In other words, the joints 30 are arranged between the loop reinforcement 12 and loop reinforcement 22 that correspond one-to-one.

[0019] 5 and 6 are diagrams showing an example of a joint 30 according to this embodiment. FIG. 5 is a perspective view, and FIG. 6 is a cross-sectional view taken along a plane including the rotation axis AX of the connecting mechanism 33 and perpendicular to the second direction D2. In FIGS. 5 and 6, the first direction D1, the second direction D2, and the third direction D3 are shown as directions when the joint 30 is disposed at the joint portion 40 of the deck slab connecting structure 100. As shown in FIGS. 5 and 6, in this embodiment, the joint 30 includes a first contact member 31, a second contact member 32, and a connecting mechanism 33.

[0020] The first contact member 31 contacts a portion of the lap portion 50. The first contact member 31 supports both the loop reinforcement 12 of the first precast floor slab 10 and the loop reinforcement 22 of the second precast floor slab 20. In this embodiment, the first contact member 31 is generally columnar in shape with a curved surface 31s protruding in one linear direction. The curved surface 31s is curved along the loop portion 12b of the loop reinforcement 12 and the loop portion 22b of the loop reinforcement 22. The first contact member 31 and the loop reinforcement 12, 22 may be tied together, for example, by a tie wire 35 (see the dashed line portions in Figures 3 and 4).

[0021] The first contact member 31 has a first support portion 31a, a second support portion 31b, a protrusion portion 31c, and a slippage suppression portion 31d. The first support portion 31a supports the loop reinforcement 12 of the first precast floor slab 10. The second support portion 31b supports the loop reinforcement 22 of the second precast floor slab 20.

[0022] The protrusions 31c are arranged on the curved surface 31s. The protrusions 31c are arranged on the curved surface 31s at both ends in the second direction D2 and between the first support portion 31a and the second support portion 31b in the second direction D2. The protrusions 31c restrict the movement of the loop line 12 supported by the first support portion 31a and the loop line 22 supported by the second support portion 31b in the second direction D2.

[0023] The spin suppression portion 31d is disposed on the opposite side to the curved surface 31s in the third direction D3. The spin suppression portion 31d suppresses spinning of the first screw shaft 34a of the connection mechanism 33, which will be described later.

[0024] The second contact member 32 contacts a portion of the lap portion 50. The second contact member 32 supports both the loop reinforcement 12 of the first precast floor slab 10 and the loop reinforcement 22 of the second precast floor slab 20. In this embodiment, the second contact member 32, like the first contact member 31, is generally columnar in shape with a curved surface 32s that protrudes in one linear direction. The curved surface 32s is curved along the loop portion 12b of the loop reinforcement 12 and the loop portion 22b of the loop reinforcement 22.

[0025] The second contact member 32 has a first support portion 32a, a second support portion 32b, a protrusion 32c, and a slippage suppression portion 32d. The first support portion 32a supports the loop reinforcement 12 of the first precast floor slab 10. The second support portion 32b supports the loop reinforcement 22 of the second precast floor slab 20.

[0026] The protrusions 32c are arranged on the curved surface 32s. The protrusions 32c are arranged on the curved surface 32s at both ends in the second direction D2 and between the first support portion 32a and the second support portion 32b in the second direction D2. The protrusions 32c restrict the movement of the loop line 12 supported by the first support portion 32a and the loop line 22 supported by the second support portion 32b in the second direction D2.

[0027] The spinning suppression portion 32d is disposed on the opposite side to the curved surface 32s in the third direction D3. The spinning suppression portion 32d suppresses spinning of the second screw shaft 34b of the connecting mechanism 33, which will be described later.

[0028] The connecting mechanism 33 integrally connects the first contact member 31 and the second contact member 32 in the linear direction. The connecting mechanism 33 has an adjustment mechanism 34. The adjustment mechanism 34 adjusts the distance between the first contact member 31 and the second contact member 32 in the linear direction.

[0029] In this embodiment, the adjustment mechanism 34 is, for example, a turnbuckle mechanism. That is, the adjustment mechanism 34 has a first screw shaft 34a, a second screw shaft 34b, and a coupler 34c. The first screw shaft 34a is connected to the first contact member 31 at a head portion 34d. The second screw shaft 34b is connected to the second contact member 32 at a head portion 34e. The head portions 34d and 34e are, for example, polygonal prism-shaped, and in this embodiment, hexagonal prism-shaped.

[0030] The coupler 34c is screw-connected to the first screw shaft 34a and the second screw shaft 34b, respectively. The coupler 34c is rotatable around the rotation axis AX, which is aligned in a linear direction. By rotating the coupler 34c in one direction around the rotation axis AX, the first screw shaft 34a and the second screw shaft 34b move apart along the rotation axis AX. By rotating the coupler 34c in the other direction around the rotation axis AX, the first screw shaft 34a and the second screw shaft 34b move closer to each other along the rotation axis AX. In this way, by rotating the coupler 34c to adjust the distance between the first screw shaft 34a and the second screw shaft 34b, it is possible to adjust the distance between the first contact member 31 connected to the first screw shaft 34a and the second contact member 32 connected to the second screw shaft 34b.

[0031] The first screw shaft 34a is connected to the spinning suppression portion 31d of the first contact member 31. The spinning suppression portion 31d is a recessed portion having a shape corresponding to the shape of the head portion 34d of the first screw shaft 34a. The head portion 34d is inserted into the spinning suppression portion 31d. With the head portion 34d inserted, the spinning suppression portion 31d is locked with the head portion 34d in the direction around the rotation axis AX. Therefore, the rotation of the first screw shaft 34a is restricted by the spinning suppression portion 31d. In this way, the spinning suppression portion 31d suppresses the spinning of the first screw shaft 34a.

[0032] The second screw shaft 34b is connected to the spinning suppression portion 32d of the second contact member 32. The spinning suppression portion 32d is a recessed portion having a shape corresponding to the shape of the head portion 34e of the second screw shaft 34b. The head portion 34e is inserted into the spinning suppression portion 32d. With the head portion 34e inserted, the spinning suppression portion 32d is engaged with the head portion 34e in the direction around the rotation axis AX. Therefore, the rotation of the second screw shaft 34b is restricted by the spinning suppression portion 32d. In this way, the spinning suppression portion 32d suppresses the spinning of the second screw shaft 34b.

[0033] The joint 30 is arranged along the third direction D3. That is, the joint 30 is arranged so that the first contact member 31 and the second contact member 32 support the lap portion 50 formed by the loop portions 12b, 22b of the loop muscles 12, 22 in the third direction D3. When the joint 30 is arranged on the lap portion 50, the distance between the first contact member 31 and the second contact member 32 is set so that the first contact member 31 and the second contact member 32 press the lap portion 50 outward in the third direction D3.

[0034] As described above, the joint 30 of this embodiment is a joint 30 that connects loop reinforcement bars 12, 22 that protrude toward each other from each precast deck PC at the joint portion 40 between the precast deck PCs and are arranged so that the loop portions 12b, 22b overlap, and is equipped with a first contact member 31 and a second contact member 32 that each have a first support portion 31a, 32a that supports the loop portion 12b of the loop reinforcement bar 12 protruding from one precast deck PC and a second support portion 31b, 32b that supports the loop portion 22b of the loop reinforcement bar 22 protruding from the other precast deck PC, and a connecting mechanism 33 that connects the first contact member 31 and the second contact member 32 together in a linear direction and has an adjustment mechanism 34 that can adjust the distance between the first contact member 31 and the second contact member 32 in the linear direction.

[0035] With this configuration, the first contact member 31 and the second contact member 32 support both the loop reinforcement 12 and the loop reinforcement 22, respectively, reducing the force that rotates the precast deck slab PC around the axis in the third direction D3. Furthermore, because the first contact member 31 and the second contact member 32 are integrally connected by the connecting mechanism 33, they can be easily attached to the joint 40 as a single member. This makes it possible to prevent the precast deck slab PC from shifting and improve workability.

[0036] In the joint 30 of this embodiment, the first contact member 31 and the second contact member 32 each have protrusions 31c and 32c between the first support portions 31a and 32a and the second support portions 31b and 32b, which restrict the movement of the loop muscles 12 and 22.

[0037] According to this configuration, the protrusions 31c and 32c can restrict the movement of the loop muscles 12 and 22, so that the connection between the loop muscles 12 and 22 can be stably maintained.

[0038] In the joint 30 according to this embodiment, the first support portions 31a, 32a and the second support portions 31b, 32b have curved surfaces 31s, 32s that are curved along the loop portions 12b, 22b.

[0039] According to this configuration, the first support portions 31a, 32a and the second support portions 31b, 32b have curved surfaces 31s, 32s that curve along the loop portions 12b, 22b, so that they can be easily attached to the joint portion 40, and the connection state between the loop reinforcement 12 and the loop reinforcement 22 can be stably maintained.

[0040] In the joint 30 of this embodiment, the adjustment mechanism 34 is a turnbuckle mechanism having a first screw shaft 34a connected to the first contact member 31, a second screw shaft 34b connected to the second contact member 32, and couplers 34c that are screw-connected to the first screw shaft 34a and the second screw shaft 34b, respectively.

[0041] According to this configuration, the distance between the first contact member 31 and the second contact member 32 can be easily adjusted by the turnbuckle mechanism.

[0042] In the joint 30 according to this embodiment, the first contact member 31 and the second contact member 32 have slippage suppression portions 31d and 32d that suppress slippage of the first screw shaft 34a and the second screw shaft 34b, respectively.

[0043] According to this configuration, the spinning prevention sections 31d and 32d can suppress the spinning of the first screw shaft 34a and the second screw shaft 34b, thereby maintaining a stable connection state between the loop muscle 12 and the loop muscle 22.

[0044] In the joint 30 according to this embodiment, the first contact member 31 and the loop reinforcements 12 and 22 are bound together by a binding wire.

[0045] According to this configuration, the first contact member 31 and the loop lines 12 and 22 are bound together by the binding wire, so that the joined portions can be prevented from coming off.

[0046] The deck joint structure 100 of this embodiment comprises a first precast deck 10 and a second precast deck 20, each having a plurality of loop reinforcements 12, 22 protruding in a first direction D1 and aligned in a second direction D2 perpendicular to the first direction D1, and joined together with the loop portions 12b, 22b of each loop reinforcement 12, 22 arranged so as to overlap in the first direction D1, and the above-mentioned joint 30, which is arranged at the joint portion 40 of the first precast deck 10 and the second precast deck 20 and connects the corresponding loop reinforcements 12, 22 together.

[0047] According to this configuration, the above-mentioned joint 30 is placed at the joint portion 40 of the first precast deck 10 and the second precast deck 20, and connects the loop reinforcement 12, 22 to each other by corresponding joints, thereby providing a deck joint structure 100 that can suppress misalignment of the precast deck PC and improve workability.

[0048] In the deck slab joining structure 100 of this embodiment, the joint 30 is arranged so that the first contact member 31 and the second contact member 32 support the loop portions 12b, 22b of the loop reinforcement bars 12, 22 in a third direction D3 perpendicular to the first direction D1 and the second direction D2.

[0049] According to this configuration, the first contact member 31 and the second contact member 32 support the loop portions 12b, 22b of the loop reinforcement 12, 22 in the third direction D3, thereby more reliably reducing the force that rotates the precast deck slab PC around the axis in the third direction D3. [Explanation of symbols]

[0050] D1 1st direction D2 2nd direction D3 Third direction PC precast deck AX Rotation Axis 10. First precast deck 11,21 Main body 11a,21a side 12,22 Loop muscles 12a,22a Straight section 12b, 22b loop section 20 Second precast deck 30 Joints 31 first contact member 31a, 32a 1st support part 31b,32b 2nd support part 31c,32c protrusion 31d, 32d Idling prevention part 31s, 32s curved surface 32 second contact member 33 Connection mechanism 34 Adjustment mechanism 34a First screw shaft 34b Second screw shaft 34c Coupler 34d, 34e head section 35 Binding wire 40 Joint part 50 Wrap section 100 Floor slab joint structure

Claims

1. A joint that connects loop reinforcement bars that protrude from each precast floor slab toward each other and are arranged so that the loop portions overlap at the joint between precast floor slabs, a first contact member and a second contact member, each having a first support portion that supports the loop portion of the loop reinforcement protruding from one of the precast floor slabs, and a second support portion that supports the loop portion of the loop reinforcement protruding from the other precast floor slab; a connecting mechanism that integrally connects the first contact member and the second contact member in a linear direction and has an adjustment mechanism that can adjust the distance between the first contact member and the second contact member in the linear direction; A fitting comprising:

2. The first contact member and the second contact member each have a protrusion between the first support portion and the second support portion to restrict movement of the loop line.

2. The joint of claim 1.

3. The first support portion and the second support portion have curved surfaces that are curved along the loop portion.

2. The joint of claim 1.

4. The adjustment mechanism is a turnbuckle mechanism having a first threaded shaft connected to the first contact member, a second threaded shaft connected to the second contact member, and couplers threadedly connected to the first threaded shaft and the second threaded shaft, respectively.

2. The joint of claim 1.

5. The first contact member and the second contact member have an anti-spinning portion that inhibits the first screw shaft and the second screw shaft from spinning freely, respectively.

5. The joint of claim 4.

6. The first contact member and the loop are bound together by a binding wire.

2. The joint of claim 1.

7. Two precast decks each having a plurality of loop reinforcements protruding in a first direction and aligned in a second direction perpendicular to the first direction, the loop portions of the loop reinforcements being joined together in a state where they are arranged so as to overlap in the first direction; The joint according to any one of claims 1 to 6, which is arranged at a joint portion of two of the precast deck slabs and connects the corresponding loop reinforcements to each other. A deck slab joint structure equipped with:

8. The joint is arranged such that the first contact member and the second contact member support the loop portion of the loop bar in a third direction perpendicular to the first direction and the second direction. The deck slab joint structure according to claim 7.

Images