Segment Connection Structure and Construction Method of Quasi-Rectangular Shield Tunnel

Abstract

The invention discloses a segment connecting structure of a quasi rectangular shield tunnel and a construction method thereof. An entire circle of segments is formed through splicing a plurality of segment blocks. The method comprises the steps of arranging bolts used for connecting two adjacent segment blocks at the joint parts of a plurality of segment blocks, in positions of which the distances relative to the inner ring surface of the entire circle of segments are the same; and analyzing to obtain the internal force distribution condition of the entire circle of segments according to a finite element model, moving the bots at the joint part bearing sagging moment by a first distance in the direction near the inner ring surface of the entire circle of segments, and moving the bots at the joint part bearing hogging moment by a second distance in the direction away from the inner ring surface of the entire circle of segments. According to the method, the blots at the joint parts bearing sagging moment are closer to the inner edges of the segments, the blots at the joint parts bearing hogging moment are closer to the outer edges of the segments, and compared with the usual arrangement form that the positions of bolts at the sagging moment and hogging moment parts of shield tunnel segments are the same, the segment connecting structure has the advantages that the joint strength is improved, and the bearing capacity of the segments is improved.

Description

technical field [0001] The invention relates to the technical field of shield tunnel segment construction, in particular to a segment connection structure of a rectangular shield tunnel and a construction method thereof. Background technique [0002] The segments of the shield structure are assembled by splicing each other. During the segment assembling process, the joint position between the segments is the weak point of the entire structure, because the segment span of the rectangular segment is large. Therefore, when the assembly is completed, the external load on the segment is relatively large. In the current conventional shield tunnel segment jointing method, the distance between the lining connecting bolts and the inner ring surface of the segment is the same. The seam method can not achieve a good structural bearing capacity. Moreover, the annular surfaces of adjacent segment segments in the existing concrete shield tunnel are basically in direct contact with each ...

AI Technical Summary

Problems solved by technology

In the current conventional shield tunnel segment joint method, the distance from the lining connecting bolts to the inner ring surface of the segment is the same, but because the bending moment on each part of the entire ring segment is different, the existing segment The seam method can not achieve a good structural bearing capacity

Moreover, in existing concrete shield tunnels, the annulus of adjacent segment segments is basically in direct contact with each other. When the tunnel segment is bent due to the stress of the surrounding water and soil pressure, or the tunnel segment is under construction When the stress concentration occurs during the assembly process, the corners of adjacent segments are easily collided with each other and cause damage

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