JP2714911B2 - Joint structure of shield segment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint structure of a shield segment used as a primary lining of a shield tunnel.

[0002]

2. Description of the Related Art FIG. 7 is a perspective view showing a joint structure of a concrete segment which is a kind of a conventional shield segment, FIG. 8 is an enlarged perspective view of a joint plate, in which 1 is a concrete segment and 2 is a box. 3 is a joint plate, 4 is a bolt hole, 5 is an attachment plate, 6 is an anchor bar, and 7 is concrete. As you can see, concrete segment 1
Box (notch recess) 2 for bolt connection to the end face
Is formed, and a joint plate 3 having a bolt hole 4 is fixed to an end of the box blank 2. In addition, as shown in FIG.
A backing plate 5 to which an anchor reinforcing bar 6 is fixed is welded to the back surface. By embedding the backing plate 5 in concrete 7, the fixing of the joint plate 3 to the end face of the concrete segment 1 is prevented. It is complete.

[0003] In joining the concrete segments 1, the end faces of the adjacent concrete segments 1 are brought into contact with the joint plate 3, and as shown in FIG. Fasten with.
The box blank 2 is for fastening the bolt 8 when the segments 1 are joined.

[0004]

However, the conventional concrete segment joint structure has the following drawbacks. The box punch 2 for bolt tightening requires a certain size in order to insert and tighten the bolts. However, when the box pull is large, the cross section of the segment body is lost, and This results in a decrease in strength. Since the rigidity and strength of the joint plate 3 are small, the joint plate 3 is easily deformed, and when a segment ring is formed, there is a possibility that the joint portion may have insufficient strength or impair water resistance. As the tunnel construction progresses, the nuts 9 to which the segments are fastened are often loosened, and re-tightening requires a lot of labor and time.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems in the conventional concrete segment joint structure, and does not require a large box punching, has high joint strength, and does not require retightening. It is intended to provide a joint structure of a segment.

In order to achieve the above object, a joint structure of a shield segment according to the present invention is provided at a position facing an end face of a peripheral portion of an adjacent segment on an inner arc surface side of an arc segment, In a joint structure of a shield segment which forms a tunnel by connecting adjacent segments, a joint plate having a tapered portion on the back surface is formed as a deep box-shaped plate including both side plates and a back plate, and the joint plate is formed. Embedded metal fittings mounted in the segment so that the outer surface of the segment is an end face at an opposing position of the segment,
A rectangular face plate that covers the opening of the facing mounting bracket and has a bolt hole at the corner, and two pieces that extend in the orthogonal direction from the bottom surface of the face plate and have tapered portions corresponding to the tapered portion of the mounting bracket on the facing surfaces. And a connecting part for fitting and connecting the tapered parts of the two legs to the tapered parts of the embedded fittings facing each other, and a stopper fixed to both corners inside the back plate of the embedded fitting. An engagement metal fitting is provided for fastening the embedded metal fitting to the connecting metal fitting by tightening the provided bolt with a nut through a bolt hole of a face plate of the connecting metal fitting.

[0007]

In joining the shield segments, the joint plates of the above-mentioned embedded metal fittings fixed to the end faces of the adjacent segments are brought into close contact with each other, and the tapered portion of the connecting metal fitting is fitted into the tapered portion of the embedded metal fitting from the inside of the segment. Then, the connecting fitting and the embedding fitting are fixed by the engaging fitting. The joining operation of the segments is easy because the taper portion of the connecting fitting is simply fitted into the tapered portion of the embedded fitting and the engaging fitting is tightened. In addition, the joint plate has a tapered portion on the back surface, so it has high strength, and the tapered portion is fitted so that the joining is perfect, and there is no loosening of the fittings due to the progress of tunnel construction, and re-tightening is necessary. There is no.

[0008]

1 and 2 are perspective views showing a joint structure of a composite segment (hereinafter, referred to as a composite segment) covered with a steel plate on all five or six surfaces according to an embodiment of the present invention, and FIG. FIG. 4 is a front perspective view of the metal fitting, FIG.
Is a perspective view of a connection fitting, in which 10 is an embedded fitting, 11 is a joint plate, 11a is a tapered portion, 12 is a side plate, 13 is a back plate,
14 is an anchor reinforcing bar, 20 is a connecting bracket, 21 is a face plate, 21
a is a bolt hole, 22 is a leg portion, 22a is a tapered portion, 30 is an engagement fitting, 31 is a stopper, 32 is a bolt, 40 is a synthetic segment, 41 is a main girder plate, 42 is a strad,
43 is an end plate, 44 is concrete, and 45 is a surface plate. The joint structure of the composite segment according to the present embodiment includes an embedded metal fitting mounted on an end face of a composite segment formed by casting concrete 44 in a steel shell formed by a main girder plate 41, a straddle 42, and an end plate 43. 10, a connection fitting 20 for connecting the embedded fittings 10 of adjacent segments to each other, and an engagement fitting 30 for joining the embedded fitting 10 and the connecting fitting 20. The embedding fitting 10 includes a joint plate 11 having a tapered portion 11a on the back surface and a side plate 1 to which an anchor reinforcing bar 14 is fixed.
2 and the back plate 13 are formed in a box shape, and the anchor reinforcing bars 14 are buried in the concrete 44 and the joint plate 11
Of the main girder plate 41 of the concrete segment
And is fixed to the composite segment with the outer surface of the joint plate 11 being flush with the end surface of the composite segment 40. The connecting bracket 20 has a bolt hole 21a at the corner.
Are formed by fixing two leg portions 22 having a tapered portion 22a to a face plate 21 having a hole formed therein. Embedded fitting 10
The taper portion 11a of the joint plate and the taper 22a of the leg of the connection fitting 20 have the same taper. Engagement fitting 30
Is formed by projecting a bolt 32 from a stopper 31 fixed to the inside of the embedded metal fitting 10. The bolt 32 is passed through a bolt hole 21 a of a face plate of the connecting metal fitting, and a nut 33 is fastened. Is fixed to the embedding fitting 10.

In joining the composite segments 40,
As shown in FIG. 6, embedded metal fittings 1 of adjacent segments
The fittings 11 are brought into close contact with each other, the connecting fitting 20 is pushed into the joint of the fitting plate 11 from the inside of the segment 40, and the tapered portion 22a of the leg of the connecting fitting 20 is fitted into the tapered portion 11a of the fitting plate. Then, the bolts 32 penetrating through the bolt holes 21 a of the face plate 21 of the connection fitting 20 are fastened with nuts 33, and the adjacent embedded fittings 10 are joined by the connection fitting 20. By fixing the embedded metal fittings 10 of the adjacent synthetic segments with the connecting metal fittings 20 in this manner,
A number of composite segments 40 are joined to form a tunnel.

In the present embodiment, the engagement fitting 30 is composed of the stopper 31, the bolt 32 and the nut 33. However, the engagement fitting is not limited to this method, but adopts another method. Is also good.

In this embodiment, an example is described in which this joint structure is applied to a composite segment of steel and concrete. However, this joint structure is not limited to a composite segment but is widely used such as a reinforced concrete segment and a steel segment. It can be used for general shield segments.

[0012]

According to the present invention, since the joint structure of the shield segment is constituted by the embedded metal fitting, the connecting metal fitting and the engaging metal fitting, the following excellent effects can be obtained. (1) Since the connecting fitting is configured to be pushed into the joint of the embedded fitting from the inside of the segment, the box for tightening work needs to be small, and the cross-sectional loss of the segment main body is reduced, resulting in reduced strength. Need less. (2) Since the joint plate has a tapered part on the back surface,
High strength. (3) Since the fastening force is transmitted through the contact between the tapered portion of the joint plate and the tapered portion of the connection fitting, the joint portion strength is large,
The stability of the segment ring is improved. (4) The joint has high strength and rigidity and is not easily deformed. (5) There is no loosening of the joint part due to the progress of tunnel construction, so retightening work is not required. (6) Segment joining work is simplified, and work automation is facilitated.

[Brief description of the drawings]

FIG. 1 is a perspective view of a composite segment in which embedded metal fittings are fixed and five surfaces of which are covered with steel plates.

FIG. 2 is a perspective view of a composite segment to which embedded metal fittings are fixed and covered with steel plates on all six surfaces.

FIG. 3 is a perspective view of a front surface of an embedding metal fitting.

FIG. 4 is a perspective view of the back surface of the embedded metal fitting.

FIG. 5 is a perspective view of a connection fitting.

FIG. 6 is a sectional view of a segment joint.

FIG. 7 is a perspective view of a conventional segment joint structure.

FIG. 8 is an enlarged perspective view of a conventional joint plate of a segment.

FIG. 9 is a sectional view of a joint portion of a conventional segment.

[Explanation of symbols]

 10 Embedding metal fittings 11 Joint plate 11a Tapered part 12 Side plate 13 Back plate 14 Anchor reinforcing bar 20 Connecting metal fitting 21 Face plate 21a Bolt hole 22 Leg 22a Taper 30 Engagement fitting 31 Stopper 32 Bolt 33 Nut 40 Composite segment 41 Main girder plate 42 Strad 43 ... End plate 44 ... Concrete 45 ... Surface plate

 ──────────────────────────────────────────────────続 き Continued on the front page (73) Patent holder 000235543 Tobishima Construction Co., Ltd. 2nd Sanbancho, Chiyoda-ku, Tokyo (73) Patent holder 000231198 Japan Land Development Co., Ltd. 4-9-9 Akasaka, Minato-ku, Tokyo (73) Patent holder 000112668 Fujita Co., Ltd. 4-6-1 Sendagaya, Shibuya-ku, Tokyo (73) Patent holder 000236610 Fudo Construction Co., Ltd. 4-2-1, Hirano-cho, Chuo-ku, Osaka-shi, Osaka (73) Patent Authority 000201478 Maeda Construction Industry Co., Ltd. 2- 10-26 Fujimi, Chiyoda-ku, Tokyo (73) Patent holder 000140982 Ma-gumi Co., Ltd. 2-58-8 Kita-aoyama, Minato-ku, Tokyo (73) Patent holder 000004123 Company 1-2-1, Marunouchi, Chiyoda-ku, Tokyo (72) Inventor Akira Inokuma 1 Asahi Asahi, Tsukuba, Ibaraki Pref. Akita Toshiaki Ishimura 1 Asahi, Asahi, Tsukuba, Ibaraki Prefecture Within the Public Works Research Institute, Ministry of Construction (72) Inventor Hiroshi Oishi 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nippon Kokan Co., Ltd. 1-1-2 Marunouchi, Chiyoda-ku Nippon Kokan Co., Ltd. (72) Inventor Yasushi Miyamoto 1-1-2 Marunouchi, Chiyoda-ku, Tokyo Nippon Kokan Co., Ltd. (56) References Jiyo Sho 62-89386 (JP) , U)

Claims (1)

(57) [Claims] (1) At an arc surface side inside an arc segment,
Set at opposing positions on the end face of the periphery of the adjacent segment.
And the adjacent segments are connected to form a tunnel.
In the joint structure of the shield segments forming a both side plate joint plate having a tapered portion on the rear surface to the one surface and the back
Formed more becomes depth deep box-shaped and plate, and embedded metal fitting is mounted within the segment as the outer surface of the joint plate with the end face of the position facing the segment, opening of the opposing buried metal Cover the corners with bolt holes
The rectangular face plate provided with
Corresponding to the tapered portion of each of the embedded metal fitting the facing surface is
And two legs each having a tapered portion.
The tapered part of the part is fitted to the tapered part of the opposed mounting bracket
A connecting metal fitting to be joined together and a strike fixed to both inner corners of a back plate of the embedded metal fitting.
Bolts on the face plate of the connecting bracket
And an engagement fitting for fastening the embedded fitting and the connecting fitting by fastening with a nut through a through hole .