JPH0637119Y2 - Segment fittings - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a joint for a lining segment used when a tunnel is dug by a shield method or the like.

[Prior art]

Conventionally, as segment joints, (1) JP-B-60-532
As disclosed in Japanese Patent Publication No. 33, a bolt is inserted through a joint portion of a segment to be connected, a spiral spring is fitted on the bolt, and a joint for tightening a nut is screwed. 2) As disclosed in Japanese Patent Laid-Open No. 60-246999, both ends of a steel arch-shaped plate in which the middle part is curved so as to separate from the joint plate inside the joint plate in the steel segment. Is fixed to form a tide arch, a bolt hole having a center line matching the bolt hole of the joint plate is provided in the center of the arch-shaped plate, and the bolt hole of the joint plate and the arch-shaped plate of the segment to be connected A joint of a segment in which a bolt is inserted across a bolt hole is known.

[Problems to be solved by the invention]

However, in the case of the joint of (1), since the long spiral spring is fitted on the bolt, the length of the bolt becomes long, and the spiral spring stores energy due to the torsional stress, so that the rigidity is low. However, when a large spring force is required, there is a drawback that the amount of bending becomes considerably large. Further, in order to manufacture a spiral spring having a required large spring force, a thick spring steel rod is required, which causes a problem of increasing the cost of the joint.

Further, in the case of the joint (2), since both end portions of the arch-shaped plate are fixed to the joint plate, there is a problem that the spring effect is hardly obtained.

[Purpose and structure of device]

The purpose of this invention is to provide a segment joint which can advantageously solve the above-mentioned problems. The gist of this invention is to provide a disc spring 3 at the base end of the shaft 2 of the bolt 1. , The shaft portion 2 is inserted through the overlapped joint plates 6 and 7 in the segments 4 and 5 to be connected, and the disc spring 3 is engaged with one joint plate 6, A joint of a segment is characterized in that a tightening nut 8 is screwed onto a shaft portion 2 protruding from the other joint plate 7.

〔Example〕

 Next, the present invention will be described in detail with reference to the illustrated example.

The drawings show an embodiment of the present invention, in which a disc spring 3 is fitted to a base end portion of a shaft portion 2 of a bolt 1, and the shaft portion 2 of the disc spring 3 is made of steel to be connected. Inserted through the through holes of the polymerized joint plates 6 and 7 in the segments 4 and 5,
The disc spring 3 is engaged with a joint plate 6 of one segment 4, and a plain washer 9 is fitted and tightened on a shaft portion 2 of a bolt 1 protruding from a joint plate 7 of the other segment 5. The nuts 8 are screwed together, and the joint plates 6 and 7 of the segments 4 and 5 are elastically tightened and coupled by the bolt 1 and the tightening nut 8 via the disc spring 3. In addition, each joint plate
Grooves extending in the longitudinal direction of the joint plate are provided at positions facing each other in 6, 7 and a sealing material 10 is fitted over the respective grooves.

The present invention can be applied to any of the segments that make up the segment ring, that is, to connect the adjacent segments in the tunnel circumferential direction or to connect the segments in the adjacent segment rings. When carrying out the present invention, the flat washer 9 may be omitted, or a plurality of disc springs 3 may be stacked and used.

[Effect of device]

According to this invention, the disc spring 3 is attached to the shaft portion 2 of the bolt 1 for fastening and coupling the joint plates 6 and 7 of the adjacent segments 4 and 5.
Since the bolt 1 is fitted, the length of the bolt 1 can be remarkably short as compared with the case where the spiral spring is fitted on the shaft portion 2, so that the vicinity of the joint, which is the defective portion of the segment main body portion, can be downsized. Moreover, the disc spring 3 exerts a large spring force even if a smaller amount of material is used than the helical spring, and therefore a segment joint having a required large elastic clamping force can be manufactured at low cost. Moreover, since it can be manufactured in a small size and a light weight, and a plurality of disc springs 3 can be used in a stacked manner, it is possible to obtain an effect that the spring constant can be freely improved.

[Brief description of drawings]

The drawings show an embodiment of the present invention. Fig. 1 is a vertical sectional side view showing a joint of a segment, Fig. 2 is a sectional view taken along the line AA of Fig. 1, and Fig. 3 is BB of Fig. 1. It is a line sectional view. In the figure, 1 is a bolt, 2 is a shaft portion, 3 is a disc spring, 4 and 5 are segments, 6 and 7 are joint plates, 8 is a fastening nut, and 9 is a flat washer.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Minoru Nakamura 2-6-3 Otemachi, Chiyoda-ku, Tokyo Within Nippon Steel Corporation (72) Kazuo Shiraishi 1-2-7 Moto-Akasaka, Minato-ku, Tokyo No. Kashima Construction Co., Ltd. (72) Inventor Muneo Yoshimura 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. (56) Bibliographic reference Sho 57-110365 (JP, U) Showa 60-93009 (JP, U) Showa 48-3574 (JP, Y1)

Claims (1)

[Scope of utility model registration request] 1. A disc spring 3 is fitted to a base end portion of a shaft portion 2 of a bolt 1, and the shaft portion 2 is inserted through each of the overlapped joint plates 6 and 7 in the segments 4 and 5 to be connected. At the same time, the disc spring 3 is engaged with one joint plate 6 and the tightening nut 8 is screwed onto the shaft portion 2 projecting from the other joint plate 7. Fittings.