JPH0776995A - Connecting structure for segment for shield construction method - Google Patents

Abstract

PURPOSE:To facilitate the positioning at assembling by providing a tapered elliptic mortise on the connecting surface of a segment piece, and inserting an asymmetric pin to the mortise to give a slight margin for movement to the segment piece. CONSTITUTION:An asymmetric pin 9 consisting of one half part 9a to be closely fitted to a tapered elliptic mortise and the other half part 9b formed slightly smaller than the mortise is inserted to the elliptic mortise provided on a segment piece connecting surface 2. At this insertion, the one half part 9a of the asymmetric pin 9 is closely fitted to the mortise of one segment piece 1, and the other pin 9b is engaged with the mortise of the other segment. In this case, even when the segment pieces are slightly displaced to each other, the pin 9 can be engaged with the mortise, and when the segment pieces 1 are pressure- connected to each other, the tapered surface 9b of the pin 9 acts as the guide, and corrects the slippage. Thereafter, the segment pieces 1 are mutually connected by a bolt and a nut. Thus, the assembling time can be shortened.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint structure for a shield construction segment.

[0002]

2. Description of the Related Art In the shield construction method, tunnels are constructed by sequentially assembling segments (segment pieces) made of steel, concrete or the like on the inner circumference of a tunnel having a circular cross section that is excavated at the rear of an excavator.

For joining the segment pieces during the above-mentioned segment assembly, conventionally, as shown in FIGS. 7 to 9, the segment pieces 1 are mounted on the piece joining surface 2 which is the joining surface between the pieces. Multiple symmetrical pins 11
Was performed by fitting the mortise 12 formed in the piece joining surface 2 of the segment piece 1 adjacent to the segment piece 1.

Further, the same method is used to join the ring joint surfaces 3 which are joint surfaces of the segments (rings) of the segment piece 1. In addition, 8 in FIG. 7 is a seal for water stoppage.

[0005]

By the way, in the above-mentioned joining structure, since the symmetrical pin 11 is used, the joining surface cannot be displaced in any direction during joining. Further, a seal 8 for stopping water is attached to the periphery of the segment piece 1 and projects several millimeters from the piece joint surface 2 and the ring joint surface 3.

Therefore, when the symmetric pin 11 is used for joining, the symmetric pin 11 is crushed by an external force while crushing the seal 8 on the face (for example, the ring joint face 3) adjacent to the pin joint face (for example, the piece joint face 2) by an external force. Need to be inserted into the mortise 12.

Therefore, there is a problem that the seal 8 is easily damaged and an excessive external force is required for inserting the pin. Further, if the symmetrical pin 11 is inserted without crushing the seal 8 on the adjoining surface, the pin axis and the tenon axis disagree with each other, so that an unreasonable force is applied to the symmetrical pin 11 and the pin is damaged.

The present invention has been proposed in order to solve such a problem, and provides a joint structure for a shield construction segment in which pins can be easily inserted without damaging the seal and the positioning accuracy is improved. The purpose is to

[0009]

A joining structure of a segment for a shield construction method according to the present invention for solving the above-mentioned problems is a joining structure of a segment which is divided into a plurality of pieces and is used in a shield construction method. , A plurality of asymmetrical pins that are installed between one of the joining surfaces of the segment pieces that are adjacent to each other to prevent the joining surface from shifting in one direction and allow the shifting in the other direction, and It is characterized by being joined by fitting with a plurality of mortises formed on the other side.

[0010]

With the above construction, the asymmetric pin allows the pin portion having a smaller size to be inserted into the mortise hole having the same shape as the pin portion having a larger size when the segment pieces are joined. A gap is created in one direction, and the pin portion can move.

As a result, a joint structure is formed in which deviation is prevented in one direction and some allowance is provided in another direction, which serves as an effective guide when assembling the segment pieces, and shortens the time during automatic assembly. It becomes a useful joint structure.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings.

First, a segment used in the shield construction method is divided into a plurality of segment pieces 1 as shown in FIGS. 4 and 5, and one ring-shaped segment is formed by assembling these segment pieces 1. . Then, one tunnel is constructed by joining these segments.

The joining surface between the pieces is a piece joining surface 2
The joint surface between the segments is the ring joint surface 3. The segment piece 1 is provided with a plurality of joint fittings 4 and bolt boxes 5 for assembling with bolts and nuts, and a segment hanging fitting 6 is attached to the central portion to form a grout hole 7.

Further, in this embodiment, as shown in FIGS. 1 and 3, a plurality of mortises 10 are formed on the piece joining surface 2 of the segment piece 1 so that the end surfaces are elliptical and tapered toward the back. The asymmetric pin 9 as shown in FIG. 2 can be fitted into the mortise 10.

The asymmetric pin 9 has a size such that one half portion 9a is closely fitted to the mortise hole 10 and the other half portion 9b is formed to be slightly smaller than the mortise hole 10. The other half portion 9b has an elliptical long axis. It has some movement in the direction.

Therefore, in joining the piece joining surfaces 2 to each other, one half 9a of the asymmetric pin 9 is attached only to the mortise 10 of the piece joining surface 2 on one side by an appropriate number of adhesives or the like. In addition, reference numeral 8 in FIG. 1 is a seal for stopping water.

Next, the joining sequence of this embodiment will be described with reference to FIG. First, as shown in FIG. 6A, the ring joint surface 3 of the segment piece 1 before assembly is positioned with respect to the ring joint surface 3 of the segment piece 1 after assembly until the mutual seals 8 and 8 abut.

Next, as shown in FIG. 6B, the segment piece 1 before assembly is pushed in the direction of the arrow in the figure, and the other half 9b of the asymmetric pin 9 attached to the segment piece 1 after assembly is attached. Is inserted into the mortise 10. At this time, the seal 8 between the piece joining surfaces 2 is crushed, and a gap is formed in the segment axial direction between the other half 9b of the asymmetric pin 9 and the mortise 10.

Then, as shown in FIG. 6 (c), the segment piece 1 before assembly is pushed in the direction of the arrow in the figure by the amount of the gap, and the ring joint surface 3 of the segment piece 1 after assembly and the ring joint surface 3 before assembly are assembled. Joining is completed by crushing the seal 8 with the ring joining surface 3 of the segment piece 1.

Needless to say, the present invention is not limited to the above embodiment, and the present joining structure can be applied to joining the ring joining surfaces 3 of each segment piece 1 to each other.

[0022]

As described above, according to the present invention, by using the asymmetric pin, it is possible to insert the pin without crushing the seal on the face which is adjacent to the pin joint face. Therefore, the seal is not damaged, an excessive external force is not required when inserting the pin, and the pin can be prevented from being damaged. In addition, the movement at the time of segment assembly becomes smooth, and the positioning accuracy can be improved.

[Brief description of drawings]

FIG. 1 is a perspective view of a main part of a segment piece showing an embodiment of the present invention.

FIG. 2 is a perspective view of the same asymmetric pin.

FIG. 3 is a perspective view of a mortise portion of the same.

FIG. 4 is a side view of a segment piece for shield construction method.

FIG. 5 is an inner view of the same.

FIG. 6 is a process drawing showing an example of the present invention.

FIG. 7 is a perspective view of a main part of a conventional segment piece.

FIG. 8 is a side view of the mortise portion.

FIG. 9 is a perspective view of the symmetrical pin.

[Explanation of symbols]

 1 segment piece 2 piece joint surface 3 ring joint surface 8 seal 9 asymmetric pin 10 mortise

 ─────────────────────────────────────────────────── ─── Continuation of the front page (71) Applicant 000207780 1-24, Shinkawa, Chuo-ku, Tokyo Daitoyo Construction Co., Ltd. (71) Applicant 591102501 Izumi, 3-12-1, Minamitsukaguchi-cho, Amagasaki-shi, Hyogo (72) Yoshimitsu Kumao 1-1-1, Wadasaki-cho, Hyogo-ku, Kobe-shi, Hyogo Mitsubishi Heavy Industries, Ltd. Kobe Shipyard (72) Inventor Yukio Shioi 15-15 Ichibancho, Chiyoda-ku, Tokyo 5 Tokyo Bay Crossing Road Co., Ltd. (72) Inventor Makoto Kanai 2-3 Kandaji-cho, Chiyoda-ku, Tokyo Obayashi Corporation Tokyo Head Office (72) Inventor Ichiro Ishii 3-10-1, Iwamoto-cho, Chiyoda-ku, Tokyo Mitsui Construction Co., Ltd. (72) Inventor Masao Komukai 2-10-9 Hongo, Bunkyo-ku, Tokyo Daitoyo Construction Co., Ltd. Tokyo Branch (72) Inventor Toshio Shimoda Yamanomiya, Hyogo Prefecture Town Hanshin distribution center 1 chome 108 address, Ltd. in Izumi

Claims (1)

[Claims] 1. A joining structure of segments divided into a plurality of pieces for use in a shield construction method, wherein a joining surface between segment pieces that are adjacent to each other is provided in one of the joining surfaces. The shield construction method is characterized in that a plurality of asymmetric pins that can prevent the displacement of the joint surface and allow the displacement in the other direction are joined with a plurality of mortises formed on the other side of the joint surface. Structure of the segment for use.