JPH09151696A - Connection method and connection structure for shield segment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve construction property and improve the reliability of a structure by providing an engaging projection part and an engaging recessed part on both end faces in shield segments which oppose to the axial direction of a tunnel and engaging the engaging projection part at an end of the shield segment on one hand with the engaging recessed part on the other hand to integrate both shield segments. SOLUTION: An engaging projection part 2 is provided and protrudes on both sides of a circular arc face which opposes to a facing side of a circular arc main body 1. An engaging recessed part 3 with which the engaging projection part 2 is engaged is provided on a circular arc face on the opposite side in the main body 1. When segments are assembled, an invert segment of the segment is inserted into the engaging recessed part 3 of the existing segment from the axial direction of a tunnel. Then, segments which follow on the right and left are inserted into the engaging recessed part 3 of the existing segment from the axial direction of the tunnel. Since the engaging projection part 2 of adjacent segments which follow are matched to form a key block shape at this time, they are joined with the existing segment securely.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a segment connecting method and a connecting structure in a shield construction method.

[0002]

2. Description of the Related Art In the conventional shield construction method, when connecting ordinary segments used for tunnel lining,
In general, fastening segments such as bolts and nuts are used to connect the segments in the tunnel circumferential direction, and the tunnel lining body is constructed continuously in the tunnel axial direction. Further, when connecting the segments in the axial direction of the tunnel, a method of fastening and connecting the segments by using bolts and nuts is also adopted.

[0003]

According to the above-mentioned conventional shield segment connecting method, in connecting the segments,
The work of tightening each bolt and nut requires a lot of work, and the work is complicated, and automation for the purpose of rapid construction and labor saving is difficult. Further, in the above-mentioned conventional connecting method, since the segment body has the bolt box, the filling process and the secondary lining of the bolt box are required.

Further, since the joint metal is exposed on the inner surface of the segment, anticorrosion treatment is required. Furthermore, the material and production costs of the joint hardware were a bottleneck in reducing manufacturing costs. The present invention has been proposed in view of the above problems of the prior art, the object of the present invention is that the workability is excellent without the need for a joint metal, the structure is highly reliable, and the construction period is shortened. The point is to provide a method and a structure for connecting shield segments, which saves construction cost.

[0005]

In order to achieve the above-mentioned object, according to the method of connecting shield segments according to the present invention, engaging projections are formed on the end faces of the respective joint surfaces of the shield segments facing each other in the tunnel axis direction. , The engaging concave portion is provided in the central portion of the opposite side joining surface, and the engaging convex portion of one end of the shield segment is engaged with the engaging concave portion of the other shield segment to integrate the both shield segments. To do.

Further, in the shield segment connecting structure according to the present invention, in the connecting structure of the shield segment in the tunnel axis direction, the connecting surfaces of the shield segments facing each other in the tunnel axis direction are aligned with each other at predetermined intervals in the circumferential direction. Is provided with an engaging concave portion and an engaging convex portion that engages with the engaging concave portion.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The most preferred embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a perspective view of a segment. Engagement protrusions 2 are provided at both ends of an arcuate surface of the arcuate main body 1 that faces the face of the arcuate face. Engagement recess 3 with which the projection 2 engages
Is provided.

FIG. 2 shows three A type segments A and two B segments.
An exploded view of a segment composed of a mold segment B and one K-shaped segment, FIG.
+ 2B + K) assembling view, FIG. 4 is a partially developed view of FIG. 3, and FIGS. 5 and 6 show details of the segment joint portion. The position of the concave portion 3 of the B-shaped segment may be at the center or may be shifted to the left or right. The position of the concave portion 3 is determined by the segment division method. The shape of the K-shaped segment also has two kinds of shapes depending on the position of the recess 3.

Next, an example of how to assemble the segments (in the case of equal division) will be described. The inverted segment of the A type segment is inserted into the recess of the existing segment P from the tunnel axial direction. Subsequently, the right and left subsequent A-shaped segments are similarly inserted into the engaging recesses 3 of the existing segment P. At this time, the engaging protrusions 2 of the adjacent succeeding segments Q abut against each other and form a key block shape, so that they are reliably joined to the existing segment P.

Then, the B-shaped segment is similarly joined to the existing segment. The K-shaped segment is an insertion type from the tunnel shaft and is attached between the B-shaped segments.

[0011]

As described above, according to the present invention, the engaging projections are provided at the end portions of the respective joining surfaces of the shield segments facing each other in the tunnel axis direction, and the engaging protrusions are provided at the central portions of the opposite joining surfaces. A recess is provided, and the engaging protrusion of one end of the shield segment is engaged with the other shield segment so that the two segments are integrally coupled, and the joint is inserted. Since it is a formula and does not require the segment fastening bolts and nuts as in the prior art, the assembling work is simple and the assembling time is greatly shortened, which is convenient for the robotization of the segment assembling work and rapid construction.

Further, according to the present invention, the shield segment does not require a conventional bolt box and the inner surface of the segment is formed into a smooth surface, so that it can be used as a tunnel lining without a secondary lining. Further, since the metal parts are not exposed on the inner surface of the segment, the rust prevention treatment is unnecessary. Further, the concave-convex engaging portion in the segment can be easily manufactured because the concave-convex engaging portion can be manufactured as an integrated structure with the segment by devising the shape of the segment main body frame. Since it can be changed freely, a joint having high strength and rigidity can be easily formed.

Further, according to the present invention, since the joint metal is not used, the manufacturing cost of the segment can be reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of a shield segment used in the present invention.

FIG. 2 is an explanatory diagram showing a configuration of a segment.

FIG. 3 is an assembly drawing of a segment.

FIG. 4 is a partially developed view of FIG.

FIG. 5 is a plan view showing details of a joint portion of a segment.

FIG. 6 is a sectional view of FIG. 5;

[Explanation of symbols]

 1 Main body 2 Engagement protrusion 3 Engagement recess P P Existing segment Q Subsequent segment

Claims (2)

[Claims] 1. An engaging convex portion is provided on each joint surface end surface of a shield segment facing each other in the tunnel axis direction, and an engaging concave portion is provided on the opposite side joint surface central portion, and one of the shield segment end portions is engaged. A method for connecting shield segments, characterized in that the convex portion is engaged with the engaging concave portion of the other shield segment to integrate the both shield segments. 2. The engaging recesses and the engaging recesses at positions that match each other at predetermined intervals in the circumferential direction on the joint surfaces of the shield segments that face each other in the tunnel axis direction in the tunnel axial direction coupling structure of the shield segment. A connecting structure for shield segments, characterized in that engaging projections for engaging are provided.