JPH10339098A - Segment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the insertion of a bolt into a bolt hole formed between joints by forming the bolt hole for connecting segments mutually and inserting the bolt into a tapered shape in which a diameter thereof is gradually enlarged toward the connection face side of the segments. SOLUTION: Faces of segments 1, 1 are brought in contact by opposing connection faces 11, 11 mutually. Bolt holes 12, 12 are provided at positions which correspond mutually on the connection faces 11, 11, and a bolt 2 is inserted therein to tighten the segments 1, 1 mutually and firmly. At this time, even if joint positions of the segments 1, 1 are deviated and irregularity occurs between the bolt holes 12 and 12, the bolt 2 can be inserted between the bolt holes 12 and 12 by passing it in the diagonal direction so far as it is a scope of taper of the bolt hole 12 because the bolt hole 12 is formed into a taper shape having a diameter enlarged part 122 on a connection face 11 side. Consequently, the bolt and a share plate can be inserted easily owing to a taper structure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a segment.

[0002]

2. Description of the Related Art As a method of constructing a large-section tunnel, a plurality of tunnel groups are constructed along the outer frame of the large-section tunnel to be constructed, and these tunnel groups are connected to each other to arrange a reinforcing bar and to concrete. There is known a construction method in which a huge outer shell is constructed by digging and excavating the ground inside.
At this time, it is possible to configure the tunnel group constituting the outer shell by rectangular segments, make the joints of the rectangular segments face each other, and insert and fix bolts and shear plates and the like into bolt holes formed in the joints, and connect them. Are known.
It is known that when the tunnel group forming the outer shell is formed by rectangular segments, the joint strength between the segments is insufficient as compared with the case where the tunnel group is formed by circular segments. In this case, it is known that a predetermined strength is ensured by using an extreme pressure plate as the joint of the rectangular segment.

[0003]

It is pointed out that the above-mentioned conventional segments have the following problems. That is, since extreme pressure plates are used to secure the strength of the joint portions of the segments, even if the joint portions of the segments are arranged to face each other, if misalignment occurs due to an arrangement error between adjacent segments, FIG. As shown in the figure, the bolt holes c, c formed in the extreme pressure plates b, b of the segments a, a are displaced from the straight line, and it becomes very difficult to insert the bolt d or the shear plate. Becomes impossible.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems. Even if segments of joints are reinforced and extreme pressure is applied, bolts or the like to bolt holes formed between joints are used. It is an object of the present invention to provide a segment for the purpose of facilitating the insertion of a segment.

[0005]

The present invention is characterized in that a bolt hole through which a bolt for connecting segments is inserted is formed in a tapered shape whose diameter gradually increases toward the connecting surface side of the segments. To be a segment.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a segment of the present invention will be described with reference to the drawings.

<A> Overall Configuration Segment 1 of the present invention shown in FIG.
The bolts 2 are connected to each other by inserting and fixing the bolts 2 into a plurality of bolt holes 12 formed on the side of the connecting surfaces 11. It is also conceivable to form a connection structure between the segments 1 and 1 via a shear plate (not shown) or the like instead of the bolt 2.

<B> Segment Since the segment 1 is used as a member for constructing the outer contour of a large-section tunnel, a predetermined rigidity is imparted to the connecting surface 11 between the segments 1 and 1 by using an extreme pressure plate 13 or the like. For example, it is a rectangular segment. A bolt hole 12 is formed in the connection surface 11 of the segment 1 for tightening the segments 1 and 1 by bolting. The bolt hole 12 has an opening 121 having a diameter of a normal bolt hole on the inside of the segment 1, an enlarged portion 122 having a diameter larger than the diameter of the bolt hole on the connection surface 11 side, and facing the connection surface 11. The tapered shape gradually increases in diameter. The number of bolt holes 12 required for connection to the extreme pressure plate 13 on the connection surface 11 side of the segment 1 is established.

<C> Segment connection structure As shown in FIG. 1, the connection surfaces 11,
By contacting 11, the openings between the enlarged diameter portions 122 of the bolt holes 12, 12 are in contact with each other. Thereby, the contact surfaces of the connecting surfaces 11 and 11 of the segments 1 and 1
The enlarged diameter portions 122, 12 each having a tapered maximum diameter at the contact surface portion.
The bolt holes 12, 12 where 2 is located communicate with each other.

[0010]

The operation of the present invention for connecting segments will now be described.

The segments 1, 1 are brought into contact with the connecting surfaces 11, 11 facing each other. Bolt holes 12, 12 are formed in the connecting surfaces 11, 11 at positions corresponding to each other, and the bolts 2 are inserted therethrough to tighten the segments 1, 1. At this time, even when the joint positions of the segments 1 and 1 are displaced and misalignment occurs between the bolt holes 12 and 12, the bolt holes 12 have the enlarged diameter portion 122 on the connection surface 11 side as shown in FIG. Since it is formed in a tapered shape, the bolt 2 can be inserted between the bolt holes 12 by passing the bolt 2 in an oblique direction within the range of the taper of the bolt hole 12. Therefore, even if a misalignment occurs between the bolt holes 12, 12, there is no bearing on the insertion of the bolt 2. After the bolt 2 is inserted into the bolt hole 12, the connection surfaces 11, 11 connected by the bolt 2 are fastened with nuts (not shown), so that the segments 1, 1 can be connected.

[0012]

Since the present invention has been described above,
Even if misalignment occurs due to placement errors between adjacent segments, the bolt holes are tapered with the enlarged diameter portions facing each other. Easy insertion of the shear plate.

[Brief description of the drawings]

FIG. 1 is an explanatory view of an enlarged connecting portion of a segment according to the present invention.

FIG. 2 is an explanatory view of a bolt hole of a segment.

FIG. 3 is an explanatory diagram of a problem of the related art.

Claims (1)

[Claims] 1. A segment, wherein a bolt hole through which a bolt for connecting the segments is inserted is formed in a tapered shape whose diameter gradually increases toward the connecting surface side of the segments.