JPH074191A - Concrete segment - Google Patents

Abstract

PURPOSE:To provide a concrete segment having the capability of preventing the occurrence of a crack or a defect at a corner during an assembly work, and further having a joint means pertinent for a deformed segment. CONSTITUTION:A forked body section 4 is integrated with a joint section 5 to form a joint fitting 3, and this body section 4 is buried in the corner section 1a of each segment 1. Furthermore, the segments 1 laid in the peripheral and lengthwise directions of a tunnel wall body 2 are joined together via the projected joint section 5. According to this construction, the corner section 1a is not damaged by the fitting 3, and a joining work can be undertaken concurrently in both peripheral and lengthwise directions.

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 A concrete segment constituting a tunnel wall body by a shield construction method is generally a rectangular plate body which is formed into a curved arc plate shape. A technique has been developed that utilizes a deformed segment such as a hexagonal shape or a trapezoidal shape, which is advantageous in that it is possible to configure the structure and that there is no restriction on the assembly order of the segments.

[0003]

In particular, in the above-mentioned deformed segment, when the tunnel wall is assembled by joining them to each other, the corners of the segment to be newly incorporated come into contact with or collide with the existing segment to cause cracks or chips. Or the stress is concentrated at the corners due to the propulsive reaction force of the shield machine or the pressure of the ground after the assembly, and cracks and chips are likely to occur as in the above case.

Further, the joint means for joining the segments may not be able to be dealt with simply by the bolt connection between the joint fittings as in the conventional case, and it is particularly desired to develop the joint means suitable for the deformed segment. There is.

The present invention has been made in view of the above circumstances, and provides a concrete segment which can prevent cracks and defects from being generated at the corners during the assembling, and which is provided with a joint means suitable for a deformed segment. The purpose is to do.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above-mentioned object, and in a polygonal concrete segment which is joined to form a tunnel wall, is joined to the corners of the segment. A bifurcated main body part that is embedded flush with the end face, and integrally with this main body part, extends 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. It is characterized in that a joint fitting composed of a joint portion is buried.

[0007]

According to the present invention, since the joint fitting is embedded in the corner portion, which is the portion which is most likely to come into contact or collide with each other during assembly, a load is applied to the corner portion to cause cracks or defects. Further, the joint portion of the joint metal fitting makes it possible to simultaneously join the segments in contact with each other in the circumferential direction of the tunnel wall body and the segments in contact with each other in the length direction.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 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 arcuate plate-shaped concrete segments 1 are joined to form a tunnel wall 2. The construction direction of the tunnel wall 2 is
The direction is from left to right as shown by the arrow (a) in FIG. 1, and adjacent segments 1 are joined by a long bolt 10 extending in the axial direction of the tunnel wall body 2 to form the tunnel wall body 2.

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

The segment 1 is formed with a bolt through hole 10a through which the bolt 10 penetrates. On the other hand, the joint portion 5 of the fitting 3 has the bolt 10 aligned therewith. A joint hole 5a is formed.

Further, at both end portions of the joint end face of the segment 1 along the circumferential direction of the tunnel wall body 2, that is, at the joint end faces facing the four corner portions 1b other than the corner portion 1a, the joint portion 5 of the joint fitting 3 is formed. Is formed with a fitting step 1c that fits without a gap. The fitting step 1c is set to half the thickness of the joint portion 5.

In order to assemble the tunnel wall body 2 by joining the segments 1 having the above-described structure, the joint metal fittings 3 are positioned on the circumferential line of the tunnel wall body 2 which constitutes the pair of corner portions 1a. Existing segment 1
On the other hand, the segment 1 to be assembled next is sequentially joined while fitting the fitting step 1c to the joint portion 5 of the joint fitting 3, and further, the bolt through hole 1 of the continuous segment 1 is joined.
0a and the bolts 10 passing through the joint holes 5 of the joint fitting 3 connect the adjacent segments 1 to each other.

According to the segment 1 of this embodiment, since the joint metal fitting 3 is embedded in the corner portion 1a, which is the portion which is most likely to come into contact or collide during assembly, a load is applied to at least this corner portion 1a. The occurrence of cracks and defects is prevented in advance.

When the segments 1 are connected to each other by the bolts 10 which are passed through the joint portion 5 of the joint fitting 3, the segments 1 that are in contact with each other in the circumferential direction of the tunnel wall body 2 and the segments 1 that are in contact with each other in the length (axial) direction. Can be joined at the same time, and it can be said that the joint means is very suitable for the hexagonal segment, and the labor and the number of parts required for the joint can be 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 segment 21 is assembled in a state where the joint end surfaces on the bottom side and the top side are arranged alternately along the circumferential direction of the tunnel wall body 22. This segment 21
At the two sharp corners 21a on the bottom side of the joint fitting 23
Is buried.

As shown in FIGS. 4 and 5, the joint fitting 23 is made of ductile cast iron or steel, and is embedded in the bent joint end face of the corner 21a so as to be flush with the joint end face. A forked body 24,
The body portion 24 is integrated with the body portion 24 and
And a joint portion 25 extending in the joint end face direction (in this case, the circumferential direction of the tunnel wall body 22) of the other pair of segments 21 that are in contact with each other and are joined to each other. In this joint fitting 23, the height (width) of the main body portion 24 covers the entire surface of the corner portion 21 a in conformity with the thickness of the segment 21, and the height of the joint portion 25 corresponds to the thickness of the segment 21. It is formed to project from the center of the main body 24 at about 1/3.

Further, both end portions of the joint end surface on the top side of the segment 21, that is, two corner portions 21 other than the corner portion 21a are formed.
A fitting groove 21c into which the joint portion 25 of the joint fitting 23 fits without a gap is formed on the joint end face facing b. The fitting groove 21c is set to have the same thickness as the joint portion 25.

A plurality of mortises 26 and pins 27 are provided on the joint end surfaces on the bottom side and the top side of the segment 21, and the pin 27 is formed on the joint portion 25 of the joint fitting 23.
Is formed with a pin hole 23a. in this case,
The pin 27 is set to face rearward (the existing direction) with respect to the building 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 diagonal joining end faces with each other with the pins 27 directed toward the existing segments 21. Team up. At this time, the fitting 23 is fitted into the fitting groove 21c, and the fitting 2
The pin hole 25a of No. 5 and the mortise hole 26 provided in the fitting groove 21c are aligned. After the ring is formed by the plurality of segments 21 in this way, 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, since the joint metal fitting 23 is embedded in the sharp corner portion 21a, which is the portion which is most likely to come into contact or collide during assembly,
It is possible to prevent cracks and defects from occurring at least by applying a load to the corners 21a.

Further, by inserting the pin 27 through the joint portion 25 of the joint metal fitting 23 fitted in the fitting groove 21c and the segment 21, the segments 1 contacting in the circumferential direction of the tunnel wall 22 and the length (axis). ) Segment 21 that touches the direction
Joints can be performed at the same time, reducing the labor required for joints and the number of parts.

[0022]

As described above, according to the concrete segment of the present invention, in a polygonal concrete segment which is joined in a large number to form a concrete structure such as a tunnel wall, it is joined to the corners of the segment. A bifurcated main body part that is embedded flush with the end face, and a joint part that is integrally formed with the main body part and that joins the other pair of segments that are joined to each other by contacting the corners from the main body part. It is characterized in that the joint metal fittings consisting of and are embedded, and since the joint metal fittings are embedded in the corners, which are the parts that are most likely to come into contact or collide during assembly, the load is applied to these corners. The occurrence of cracks and defects is prevented in advance, and the joint section
It is possible to simultaneously join segments that contact the circumferential direction of the tunnel wall and segments that contact the lengthwise direction at the same time, which reduces the labor required for the joint and the number of parts, and is especially suitable for irregular-shaped segments. This has the effect of realizing the means.

[Brief description of drawings]

FIG. 1 is a side view of a tunnel wall body according to a segment of an 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 body 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 of another embodiment.

[Explanation of symbols]

1, 21 ... Concrete segment, 1a, 21a ... Corner, 2, 22 ... Tunnel wall, 3, 23 ... Joint fitting,
4, 24 ... Main body part, 5, 25 ... Joint part.

Claims (1)

[Claims] 1. In a polygonal concrete segment which is joined to form a tunnel wall, a bifurcated main body portion which is embedded in a corner of the segment so as to be flush with the joint end surface, and the main body. A concrete segment characterized in that a joint fitting consisting of a main body portion and a joint portion extending from the main body portion in the joint end face direction of the other pair of segments which are joined to each other in contact with the corner portion is embedded. .