JPH0539700A - Concrete segment for tunnel - Google Patents

Abstract

PURPOSE:To facilitate automation of bolt-fastening work. CONSTITUTION:First, second connecting parts 5, 6 for connecting adjacent segment bodies 2 are provided at first, second butt face parts 3, 4 respectively. In order construct the first connecting part 5, a first coupling metal 8 in which a bolt inserting hole 7 is formed, is embedded in the first butt end part 3. in order to construct the second connecting part 6, a second coupling metal 12 in which a female screw part 10 for a bolt 9 inserted into the bolt inserting hole 7 of the adjacent segment body 2, and an anchor part 11 for concrete of the segment body 2 are formed, is embedded in the second end face part 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete segment for a tunnel, in which first and second end faces of a segment body are provided with first and second connecting portions for bolting adjacent segment bodies. Regarding

[0002]

2. Description of the Related Art Conventionally, the first and second connecting portions of a concrete segment for tunnel have bolt insertion holes formed in the first and second end face portions, and an operation for fastening a bolt and a nut. When connecting adjacent segment bodies to each other, overlap both bolt insertion holes and then insert bolts from one insertion hole to the other insertion hole in the operation opening recess. A method of inserting the nut and screwing a nut to the tip of the bolt to fasten the bolt was used.

[0003]

However, according to the above-mentioned conventional structure, since both bolts and nuts are used to perform the fastening work, in the fastening operation, in addition to the operation of the bolts, The nut must be held and operated, and as a result, the operation becomes complicated,
There is a drawback that automation of bolt fastening work is difficult.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned conventional drawbacks and to provide a concrete segment for tunnel which facilitates automation of bolt fastening work.

[0005]

In order to achieve the above object, in the concrete segment for a tunnel according to the present invention, a first joint fitting having a bolt insertion hole is formed in the first connecting portion. A second joint fitting which is embedded in the end face portion and constitutes a second connecting portion, in which a female screw portion for a bolt inserted into the bolt insertion hole of an adjacent segment body and an anchor portion for concrete of the segment body are formed. Is embedded in the second end face portion, and the operation and effect thereof are as follows.

[0006]

In other words, by embedding the first and second joint fittings having the above-mentioned configurations in the first and second end face portions separately, the bolt insertion hole is provided on the first end face portion side and the adjacent segment main body A female screw portion for the bolt inserted through the bolt insertion hole can be provided on the second end surface portion side.

Therefore, the adjacent segment main bodies are butted to each other, and the bolts are inserted into the bolt insertion holes of the first end surface portions of the segment main bodies, and the bolts are inserted into the female threads of the second end surface portions of the adjacent segment main bodies. By screwing into the portion, both segment main bodies can be connected by bolts without using a nut.

Further, since the nut is no longer used, it is not necessary to form a large operation opening concave portion for operating the nut in the second end surface portion, and the strength of the second connecting portion is improved. be able to.

In addition, since the second joint fitting is formed with an anchor portion for the concrete of the segment body, the second joint fitting is less likely to come off from the concrete, and as a result, the strength of the second connecting portion is improved. By synergistically working with this, the connected state of both segments can be reliably maintained.

[0010]

As described above, the two segment bodies can be connected to each other by bolts without using a nut, and the bolt tightening operation can be done easily. Therefore, the bolt tightening work can be automated and the workability can be improved. Can be improved, and moreover, the connected state can be reliably maintained,
It was possible to provide a concrete segment for a tunnel that can form a tunnel inner wall with high safety and durability.

[0011]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 3 shows a plurality of tunnel concrete segments 1 arranged on the inner peripheral surface of the tunnel in the circumferential direction and the axial direction of the tunnel. The concrete segment 1 is connected over the entire inner surface of the tunnel with the ends thereof abutting each other to form an inner wall of the tunnel.

In constructing the tunnel segment 1, as shown in FIG. 2, the segment main bodies 2 are formed in a curved plate shape in accordance with the cross-sectional shape of the tunnel, and are adjacent to each other in the axial direction and the circumferential direction of the tunnel. First and second connections for connecting the adjacent segment bodies 2 to the first and second butt ends 3 and 4 (an example of the first and second end face portions) of the tunnel segment 1 with respect to the segment body 2. Part 5,
6 are provided respectively.

As shown in FIGS. 1 (a), (b) and FIG.
To form the first connecting portion 5, a plurality of openings S are provided in the vicinity of the peripheral portion on the axial center side of the tunnel and on the first butting end 3 side, and the bolts are inserted into the openings S. A first metal fitting 8 made of metal and having a U-shape in plan view and having a hole 7 formed therein is embedded.

In the second connecting portion 6, a female screw portion 10 for the bolt 9 inserted into the bolt insertion hole 7 of the adjacent segment body 2 and a substantially disk-shaped portion of the segment body 2 for concrete are formed. The second metal fittings 12 made of metal and having the anchor portion 11 and the anchor portion 11 separately formed at both ends are embedded in the second butted end portion 4 in the same number as the first metal fittings 8. As shown in FIG. 5, the anchor portion 11 has flat portions 11A formed at two locations on its peripheral portion,
It prevents rotation around the axis in concrete.

The connecting work between the concrete segments 1 for tunnels having the above-mentioned structure is performed as follows.

Already disposed on the inner peripheral surface of the tunnel,
The first butting end 3 of the new segment body 2 is butted to the second butting end 4 of the segment body 2 which is in a connected state with the other segment body 2. The bolt 9 is inserted into the bolt insertion hole 7 of the first butting end 3 of the new segment body 2 via the washer 15 and the grommet 16, and the bolt 9 is
It is screwed onto the female screw portion 10 of the second butting end portion 4 of the adjacent segment main body 2.

[Other Embodiments] As shown in FIGS. 4 (a) and 4 (b), the abutting end portions of the first and second joint fittings 8 and 12 are provided with a convex portion 13 and a concave portion 14 which are fitted with each other. May be separately provided. With this structure, not only the positioning of the connecting portions becomes easy, but also the fitting force between the convex portion 13 and the concave portion 14 resists the shearing force applied between the segments 1. Therefore, the bolt diameter can be reduced as compared with the case where the bolt 9 alone resists the shearing force. The first joint fitting 8 may be provided with the concave portion 14 and the second joint fitting 12 may be provided with the convex portion 13.

The anchor portion 11 may be formed in a polygonal shape.

It should be noted that reference numerals are given in the claims for convenience of comparison with the drawings, but the present invention is not limited to the structures of the accompanying drawings by the entry.

[Brief description of drawings]

[FIG. 1] (a) Sectional view showing how to connect concrete segments for tunnels. (B) Sectional view showing how to connect concrete segments for tunnels.

FIG. 2 is a perspective view of a concrete segment for a tunnel.

FIG. 3 is a plan view showing a connected state of concrete segments for tunnels.

[Fig. 4] (a) A cross-sectional view showing how to connect a concrete segment for tunnel in another embodiment. (B) A cross-sectional view showing a way to connect a concrete segment for tunnel in another embodiment.

FIG. 5 is a perspective view of a second joint fitting.

[Explanation of symbols]

 2 segment main body 3 1st end surface part 4 2nd end surface part 5 1st connection part 6 2nd connection part 7 bolt insertion hole 8 1st joint metal fitting 9 bolt 10 female screw part 11 anchor part 12 2nd joint metal fitting 13 convex part 14 concave part

Claims (2)

[Claims] 1. A first and second connecting portion for bolting an adjacent segment body (2) to each of the first and second end face portions (3), (4) of the segment body (2). 5),
In the concrete segment for a tunnel provided with (6), a first joint fitting (8) having a bolt insertion hole (7) is formed in the first coupling part (5) to form the first coupling part (5).
The second threaded portion (10) is embedded in the end surface portion (3) and constitutes the second connection portion (6), with respect to the bolt (9) inserted through the bolt insertion hole (7) of the adjacent segment body (2). ) And an anchor part (11) for the concrete of the segment body (2), the second joint fitting (12) is embedded in the second end face part (4) for tunnel concrete segment. 2. A convex portion (13) and a concave portion (14) which are fitted with each other are provided separately at the abutting ends of the first and second joint fittings (8), (12). The concrete segment for a tunnel according to 1.