JP3148465B2 - Concrete 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 polygonal concrete segment which is joined to form a tunnel wall.

[0002]

2. Description of the Related Art In general, a concrete segment forming a tunnel wall by a shield method is formed by bending a rectangular plate into an arc plate shape. And the use of a hexagonal or trapezoidal shaped segment having advantages such as no limitation on the order of assembling the segments.

[0003]

Particularly, in the above deformed segments, when the tunnel wall is assembled by joining together, the corners of the newly incorporated segments come into contact with or collide with the existing segments, causing cracks or chips. In addition, the stress is concentrated on the corners due to the propulsion reaction force of the shield machine or the pressure of the ground after the assembling, and cracks and chips are easily generated as described above.

[0004] Also, the joint means for joining the segments may not be able to be dealt with simply by the simple bolt connection between the joint fittings as in the prior art. In particular, it has been desired to develop joint means suitable for deformed segments. I have.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and provides a concrete segment which can prevent cracks or breakage at corners during assembly and has joint means suitable for deformed segments. It is intended to be.

[0006]

DISCLOSURE OF THE INVENTION The present invention has been made to achieve the above-mentioned object. In a polygonal concrete segment which is joined to form a tunnel wall body, a corner portion of the segment is joined with a joint. A bifurcated main body buried flush with the end face, and integral with the main body, extending from the main body in the direction of the joining end faces of the other pair of segments that are joined to each other in contact with the corners A joint fitting comprising a joint part is embedded.

[0007]

According to the present invention, since the joint fitting is buried in the corner which is most likely to contact or collide during assembly, a load is applied to this corner to cause cracks or breakage. Also, the joint portion of the joint fitting makes it possible to simultaneously join the segments that contact in the circumferential direction of the tunnel wall and the segments that contact in the longitudinal direction.

[0008]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a state in which a plurality of hexagonal arc-shaped concrete segments 1 are joined to form a tunnel wall 2. The construction direction of the tunnel wall 2 is
In FIG. 1, from left to right as indicated by an arrow (a), adjacent segments 1 are joined together by long bolts 10 extending in the axial direction of the tunnel wall 2 to form the tunnel wall 2.

As shown in FIG. 2, a joint fitting 3 is embedded in two corners 1a of the six corners of the segment 1, which are located on a line in the circumferential direction of the tunnel wall 2. I have. The joint fitting 3 is made of ductile cast iron or steel, and has a bifurcated main body 4 buried flush with the bent joint end face of the corner 1a. And the other end of the pair of segments 1 joined to each other in contact with the corner 1a from the main body 4 (in this case, the tunnel wall 2).
(Circumferential direction) of the joint portion 5.
The two main body parts 4 and the joint part 5 are formed in a trifurcated shape that branches at substantially equal angles. This fitting 3 has its height (width).
Corresponds to the thickness of the segment 1, and the main body 4 covers the entire surface of the corner 1a.

The segment 1 is formed with a bolt through hole 10a through which the bolt 10 penetrates. On the other hand, the bolt 10 is passed through the joint portion 5 of the joint fitting 3 in conformity with the bolt through hole 10a. Joint hole 5a is formed.

Further, the joint portion 5 of the joint fitting 3 is provided at both ends of the joint end surface of the segment 1 along the circumferential direction of the tunnel wall 2, that is, at the joint end surfaces facing the four corner portions 1b other than the corner portions 1a. Are formed without any gap. The fitting step 1c is set to half the thickness of the joint portion 5.

In order to assemble the tunnel wall 2 by joining the segments 1 having the above configuration, the joint 1 is located on a line in the circumferential direction of the tunnel wall 2 forming the pair of corners 1a in which the fittings 3 are embedded. Existing segment 1
The segments 1 to be assembled next are sequentially joined while the fitting step 1c is fitted to the joint portion 5 of the joint fitting 3, and further, the bolt through holes 1 of the continuous segments 1 are further joined.
The adjacent segments 1 are connected to each other by a bolt 10 passing through the joint hole 5 of the joint fitting 3 and the joint fitting 5.

According to the segment 1 of this embodiment, since the joint fitting 3 is embedded in the corner 1a, which is the most likely to contact or collide during assembly, a load is applied to at least this corner 1a. Cracks and defects are prevented from occurring.

When the segments 1 are connected to each other by bolts 10 passing through the joint portion 5 of the joint fitting 3, the segments 1 contacting in the circumferential direction of the tunnel wall 2 and the segments 1 contacting in the length (axial) direction. Can be performed at the same time, and it can be said that the joint means is extremely suitable for hexagonal segments, and the labor and the number of parts required for the joint are reduced.

Next, another embodiment of the present invention will be described.
FIG. 3 shows a state in which a plurality of trapezoidal arc-shaped concrete segments 21 are joined to form a tunnel wall 22. The construction direction of the tunnel wall 22 is shown in FIG.
Is from left to right as indicated by the arrow (b). The trapezoidal segments 21 are assembled in such a manner that the joint end faces on the bottom side and the top side are arranged alternately along the circumferential direction of the tunnel wall 22. This segment 21
Fittings 23 are provided at the two sharp corners 21a on the bottom side of the
Is buried.

As shown in FIGS. 4 and 5, the joint fitting 23 is made of ductile cast iron or steel, and is buried in the bent joint end face of the corner 21a so as to be flush with the joint end face. Bifurcated main body 24,
Integrally with the main body 24, the corners 21 a
And a joint portion 25 extending in the direction of the joint end faces of the other pair of segments 21 that are joined to each other in contact with the inner wall (in this case, the circumferential direction of the tunnel wall 22). In the joint fitting 23, the main body 24 has a height (width) corresponding to the thickness of the segment 21 and covers the entire corner 21 a, and the height of the joint 25 is equal to the thickness of the segment 21. About 1/3, it protrudes from the center of the main body 24.

Further, both ends of the joint end surface on the top side of the segment 21, that is, two corners 21 other than the corner 21a
A fitting groove 21c into which the joint 25 of the joint fitting 23 is fitted without any gap is formed on the joint end face facing b. The fitting groove 21c is set to be equal to the thickness of the joint 25.

A plurality of mortise holes 26 and pins 27 are provided on the joint end faces on the bottom side and the top side of the segment 21, respectively.
Is formed through the pin hole 23a. in this case,
The pin 27 is set to face rearward (existing direction) with respect to the construction direction of the tunnel wall 22.

In order to assemble the tunnel wall 22 by joining the segments 21, the segments 21 are first formed into a ring shape by aligning the oblique joining end surfaces with the pins 27 facing the existing segment 21. Team up. At this time, the fitting 23 is fitted into the fitting groove 21c,
The pin hole 25a of No. 5 and the mortise hole 26 provided in the fitting groove 21c are aligned. When a ring is formed by the plurality of segments 21 in this manner, the pins 27 are inserted into the mortises 26 of the segments 21 of the ring and joined to form a similar ring. The tunnel wall 22 is constructed by repeating this operation.

According to the segment 21, the fitting 23 is buried in the sharp corner 21a which is the part which is most likely to contact or collide during assembly.
It is possible to prevent a crack or a chip from being generated by applying a load to at least the corner portion 21a.

Further, by passing a pin 27 through the joint portion 25 of the joint fitting 23 fitted into the fitting groove 21c and the segment 21, the length of the segment 1 which is in contact with the circumferential direction of the tunnel wall 22 and the length (shaft) Segment 21 bordering on the direction
Joining can be performed at the same time, and the labor required for the joint and the number of parts can be reduced.

[0022]

As described above, according to the concrete segment of the present invention, in a polygonal concrete segment which is joined to form a concrete structure such as a tunnel wall, the concrete segment is joined to the corner of the segment. A bifurcated main body portion buried flush with the end face, and a joint portion extending in the direction of the joint end surface of another pair of segments that are integrated with the main body portion and joined to each other in contact with the corner portion from the main body portion It is characterized by the fact that the fitting fitting consisting of is buried, and since the fitting fitting is buried in the corner that is the most likely to contact or collide during assembly, a load is applied to this corner Cracks and breakage are prevented from occurring, and the joints
It is possible to simultaneously join segments that are in contact with the circumferential direction of the tunnel wall and segments that are in contact with each other in the lengthwise direction, reducing the labor and number of parts required for the joint, and is particularly suitable for a deformed segment. This has the effect of realizing the means.

[Brief description of the drawings]

FIG. 1 is a side view of a tunnel wall according to one embodiment of the present invention.

FIG. 2 is a perspective view of a segment of one embodiment.

FIG. 3 is a side view of a tunnel wall according to another embodiment of the present invention;

FIG. 4 is a perspective view of a segment of another embodiment.

FIG. 5 is a perspective view of a joint portion of a segment according to another embodiment.

[Explanation of symbols]

1,21 ... concrete segment, 1a, 21a ... corner, 2,22 ... tunnel wall, 3,23 ... joint fitting,
4, 24: body part, 5, 25: joint part.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-U 1-174494 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) E21D 11/08 E21D 11/04

Claims (1)

(57) [Claims] 1. A polygonal concrete segment which is joined in a large number to form a tunnel wall, a fork-shaped main body buried flush with a joint end face at a corner of the segment, A joint part comprising a joint part integrally formed with the main body and extending from the main body part in the direction of the joint end faces of the other pair of segments that are joined to each other in contact with the corners. .