JP2001280084A - Joint structure for concrete structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the tension resistance of a joint and prevent it from being removed from a concrete structure. SOLUTION: When separating tensile force is applied to fayed segments 20, there is a possibility that the joint 10 is removed from the concrete structure 20, however the bolt insertion part 11 of the joint 10 has a taper shape and acts to bite into the concrete structure 20 in the segment 20, and the bolt insertion part 11 is prevented from being not only expanded as before but also removed from the concrete structure 20. The tension resistance and reliability as the joint can be increased as a result.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a subway tunnel,
The present invention relates to a joint structure of a concrete structure used when constructing water supply and sewerage, a water storage tank, and the like.

[0002]

2. Description of the Related Art In recent years, when constructing subway tunnels, water and sewage systems, water storage tanks, etc., arc-shaped concrete that has been standardized and produced in a factory in advance has been used for the purpose of shortening the construction period and reducing the space at the construction site. Structures are used. Transport this concrete structure from the factory to the construction site,
Subway tunnels, water and sewage systems, etc. are constructed by fastening and assembling prefabricated systems at construction sites.

[0003] By the way, a joint provided in a conventional concrete structure of this kind has been configured as shown in FIG. That is, a plurality of joint plates 2 are buried in the peripheral end surface of a segment 1 which is an arc-plate-shaped concrete structure.
Are made by abutting the end faces of each other and bolting each joint plate 2 provided on each end face.

[0006] As shown in FIGS. 6 and 7, the joint plate 2 has an anchor 6 fixed by welding to side plates 5 provided on both sides of a joint plate 4 having a bolt insertion hole 3. The both side portions 5 and the anchor 6 are embedded in the segment 1 with the joint plate portion 4 exposed at the end face.

[0005]

However, in the prior art segment 1, when a strong tensile force acts on the segments 1 in a direction in which the segments 1 are separated from each other, stress is applied to the central portion 7 of the joint plate portion 5 which is fastened. As shown in FIG. 8, the joint plate portion 5 is curved and the bolted central portion 7 bulges outward as shown in FIG. 8, so that the joint end surfaces of the two segments 1 may be separated from each other. This means
This is extremely important for water and sewage and water storage tanks that require watertightness, and also extremely important in that the structure of the water and sewage and water storage tank itself is weakened.

In order to reinforce the joint plate portion 5 of the joint plate 2, it is conceivable to increase the wall thickness of the joint plate 2. However, in this case, the weight of the joint plate 2 itself is increased. However, there is a problem that the workability is deteriorated and the workability is reduced, and further, there is a problem that the cost rises accordingly.

[0007] The conventional joint plate 2 has two side plate portions 5.
Since the anchor 6 and the anchor 6 are simply buried in the concrete, if a tensile force acts on the joint of the segment 1, the joint plate 2 may come off from the segment 1.

[0008] The present invention has been made in view of the above circumstances, and even if a tensile force acts between the connected concrete structures, the concrete structures have a tensile resistance so that the joining end faces of the concrete structures are not separated from each other. Can be enhanced,
An object of the present invention is to provide a joint structure for a concrete structure that can prevent the concrete structure from coming off.

[0009]

In order to achieve the above object, a joint structure for a concrete structure according to claim 1 is provided.
A joint structure for a concrete structure provided in a concrete structure and fastened and fixed to each other by bolts to join the concrete structures, wherein the concrete structure has a cylinder having a bolt insertion hole through which the bolt is inserted. Joints having a bolt-shaped bolt insertion part and a reinforcing bar connection part connected to the bolt insertion part via a support part, and the bolt insertion part of the joint is gradually increased from the front end to the rear end. It is characterized by having a tapered shape.

[0010] As described above, when the bolt insertion portion has a tapered taper shape, when the bolt insertion portion is embedded in a concrete structure, the bolt insertion portion acts so as to bite into the concrete structure in the concrete structure, and the bolt insertion portion. Not only does the part not bulge as in the prior art,
It does not escape from concrete structures. Therefore,
When provided on a concrete structure, reliability can be reliably improved as a joint for connecting the concrete structure.

[0011] The joint structure for a concrete structure according to claim 2 is the concrete structure according to claim 1,
The rebar connection portion is characterized in that it has a tapered shape whose outer shape gradually increases from the front end to the rear end.

As described above, since the reinforcing bar connecting portion has a tapered shape, the reinforcing bar connecting portion also acts on the concrete structure in the same manner, so that the reinforcing bar connecting portion can be reliably prevented from coming off from the concrete structure. Reliability can be improved.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A joint structure of a concrete structure according to an embodiment of the present invention will be described below with reference to FIGS. In this embodiment, the concrete structure is described as an example of a segment that is formed in an arc plate shape and joined to each other to form a tunnel lining body. As shown in FIG.
Is curved in the shape of an arc plate, and a plurality of joints 10 are embedded along the periphery thereof. And this joint 10
As shown in FIGS. 1 and 2, a cylindrical bolt insertion portion 11 is provided.
And a reinforcing bar connecting portion 13 connected thereto.

The bolt insertion portion 11 is for connecting the segments 20 to each other, and is provided with a bolt insertion hole 11a penetrating along the axial direction at the center thereof. In this embodiment, the bolt insertion portion 11 is formed by casting. ing.

The reinforcing bar connection portion 13 has a smaller diameter than the bolt insertion portion 11, and is attached via a support portion 12 to a position around the bolt insertion portion 11 that faces each other.
One end of an anchor reinforcing bar 14 is attached to the reinforcing bar connecting portion 13, and the other end of the anchor reinforcing bar 14 extends rearward along the axial direction of the bolt insertion portion 11 (inward of the segment 20). In this case, the attachment between the anchor reinforcing bar 14 and the reinforcing bar connecting portion 13 is not shown, but is performed as follows.

That is, the anchor reinforcing bar 14 is made of a threaded bar, which is screwed into the hole of the reinforcing bar connecting portion 13 and attached. When the reinforcing bar connecting portion 13 is a cast product, the anchor reinforcing bar 14 may be integrally formed with the reinforcing bar connecting portion 13 by so-called cast-in. Alternatively, a metric thread may be applied to one end of the anchor reinforcing bar 14 and the inside of the reinforcing bar connecting portion 13 and the two may be screwed together. In any case, it suffices that one end of the anchor reinforcing bar 14 is securely attached to the reinforcing bar connecting portion 13.

In the joint 10, the bolt insertion portion 11 and the reinforcing bar connection portion 13 are tapered. That is, the bolt insertion portion 11 has a tapered shape having a tapered tip, and has a conical shape whose diameter gradually increases from the tip toward the rear end (inward of the concrete structure 20). The rebar connection part 13 is also tapered like the bolt insertion part 11, and is formed so that the diameter gradually increases from the front end to the rear end.

The joint 10 as described above is integrally embedded in the segment 20. In this case, the bolt insertion portion 11 of the joint 10 has a distal end face as shown in FIG.
0 is exposed. Therefore, the segment 20 is connected to the bolt insertion portion 11 of the joint 10.
And a hole for exposing to the outside is provided, and a bolt box 21 for bolt fastening operation for fastening with bolts and nuts is provided. When constructing a tunnel lining body with such a segment 20, the end faces of the segment 20 abut against each other and the bolt insertion hole 11 a of the bolt insertion portion 11 of the joint 10.
Are connected to each other by aligning them with each other, inserting them into the bolt insertion holes 11a, and fastening them with nuts.

In this state, even if a tensile force acts to separate the segments 20 from each other, as described above, the bolt insertion portion 12 of the joint 10 has a tapered shape, and the bolt insertion portion 11 has a tapered shape. Since it acts so as to bite into the concrete in the segment 20, the bolt insertion portion 11 does not not only bulge like a conventional joint plate but also does not come off from the segment 20. As a result, the tensile resistance of the joint can be reliably increased, and the reliability of the joint can be increased.

In addition, in the present joint 10, not only the bolt insertion portion 11 but also the reinforcing bar connecting portion 13 is similarly tapered, so that the reinforcing bar connecting portion 13 acts in the same manner, and the joint 10 together with the bolt inserting portion 11 is connected. The joint 20 can be reliably prevented from coming off, and the reliability as a joint can be further improved. In particular, when the segment 20 is applied to water and sewage or a water storage tank, the segment 2
This is even more beneficial because there is no risk that 0s will separate.

Although the joint 10 has the rebar connecting portions 13 provided on both sides of one bolt insertion portion 11 and a linear joint as a whole is shown, the present invention is not limited to this. For example, the present invention can be applied to a joint 10 as shown in FIG.

That is, the joint 10 shown in FIG. 4 is similar to the above-described joint 10 which is connected in two stages in the upper and lower directions, and has an upper portion in which a reinforcing bar connection portion 13 is connected to a bolt insertion portion 11 via a support portion 12. The joint unit 10 </ b> A and the lower joint unit 10 </ b> B configured in the same manner are integrated by the connecting portion 15.

In this case, the upper end of the connecting portion 15 is fixed to the bolt insertion portion 11 of the upper joint unit 10A, and the lower end is similarly fixed to the bolt insertion portion 11 of the lower joint unit 10B. And the upper joint unit 10A
And the lower joint unit 10B, the bolt insertion portion 1
1 and the reinforcing bar insertion portion 13 are each formed in a tapered shape.

When such a joint 10 is embedded in the segment 20, the number of tapered portions increases, so that the tensile strength of the segment 20 can be further increased, and the effect can be further enhanced.

In the illustrated embodiment, the joint 1
A hole may be formed in the support portion 12 of 0, and in this case, the concrete can be satisfactorily wrapped around when the segment 20 is molded. Further, by making one of the joints 10 of the segments 20 to be joined to each other an insert type in which the bolt insertion holes 11a of the bolt insertion portions 11 are screw holes, the joining operation can be further simplified, The number of bolt boxes 21 can be reduced. Furthermore, in the above example, the bolt insertion portion 11 is exposed at the end face of the segment 20. However, the present invention is not limited to this, and the end face may be closed by a pedestal or the like.

[0026]

As described above, according to the joint structure for a concrete structure of the present invention, the following effects can be obtained. According to the joint structure for a concrete structure according to claim 1, the bolt insertion portion has a tapered shape, and the bolt insertion portion acts in the concrete structure so as to bite into the concrete structure. Not only does it not swell out like a conventional joint plate, but also does not come off from concrete structures, resulting in higher tensile resistance and reliability as a joint connecting concrete structures. This has the effect of being able to be reliably increased, and is particularly useful when a concrete structure is applied to segments constituting water and sewage systems, water storage tanks, and the like.

According to the joint structure for a concrete structure according to the second aspect, since the reinforcing bar connecting portion has a tapered shape, the reinforcing bar connecting portion also acts on the concrete structure in a similar manner, and it is ensured that the reinforcing bar comes off from the concrete structure. And the reliability of the joint can be improved accordingly.

[Brief description of the drawings]

FIG. 1 is a plan view of a joint showing one embodiment of a joint structure for a concrete structure according to the present invention.

FIG. 2 is a front view of a joint showing one embodiment of a joint structure for a concrete structure according to the present invention.

FIG. 3 is a perspective view of a segment showing a concrete structure in which a joint is embedded.

FIG. 4 is a perspective view of a joint showing another embodiment of the concrete structure according to the present invention.

FIG. 5 is a perspective view of a segment showing a concrete structure using a conventional joint.

FIG. 6 is a perspective view showing a conventional joint.

FIG. 7 is a sectional view showing a joint embedded in a segment.

FIG. 8 is a cross-sectional view illustrating a phenomenon that occurs in a conventional joint.

[Explanation of symbols]

Reference numeral 10 denotes a joint, 11 denotes a bolt insertion portion, 11a denotes a bolt insertion hole, 12 denotes a support portion, 13 denotes a reinforcing bar connection portion, and 20 denotes a segment (concrete structure).

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2D055 GC05 GC06 2E125 AA68 AA70 AE01 AG08 AG41 AG60 BA25 BA34 BA35 BB08 BB09 BB16 BB27 BC07 BC09 BE05 BE07 CA05 EA17

Claims (2)

[Claims] 1. A joint structure for a concrete structure which is provided on a concrete structure, is fastened and fixed to each other by a bolt, and joins the concrete structure, wherein the concrete structure is a bolt through which the bolt is inserted. A cylindrical bolt insertion portion having an insertion hole, and a joint having a reinforcing bar connection portion connected to the bolt insertion portion via a support portion, are joined to each other, and the bolt insertion portion of the joint extends from a front end to a rear end thereof. A joint structure for a concrete structure, characterized in that the joint structure has a tapered shape gradually increasing toward the surface. 2. The joint structure for a concrete structure according to claim 1, wherein the reinforcing bar connection portion has a tapered shape whose outer shape gradually increases from a front end to a rear end.