Segment structure and construction method of a convex shield tunnel

Abstract

The invention discloses a segment structure of a convex shield tunnel and a construction method thereof, which is composed of a plurality of single-ring segment structures connected in series. The reverse convex segments are staggered and assembled along the tunnel circumferential direction, the positive convex segments include the first grouting holes; the reverse convex segments include the second grouting holes; the first grouting holes are The short grouting channels are respectively arranged on the two wings of the positive convex segment; the second grouting hole includes a short grouting channel and a long grouting channel, the long grouting channel is set at the center of the reverse convex segment, and the short grouting channel The holes are respectively arranged on the two wings of the reverse convex segment; when the positive convex segment fits with the reverse convex segment, the first hollow cylindrical steel pipe is inserted after the short grouting channel corresponds, and the first hollow cylindrical steel pipe is inserted into the long grouting channel. Two hollow cylindrical steel pipes. The invention reduces the radial staggering of the whole-ring shield segment structure through the mutual fit of the convex segment structures, which is beneficial to the long-term stability and safety of the tunnel.

Description

technical field [0001] The invention relates to the field of shield tunneling subway tunnel engineering, in particular to a convex shield tunnel segment structure and a construction method. Background technique [0002] With the continuous development of urban subway tunnel construction, the shield tunneling method is widely used in urban subway projects due to its safe and reliable construction, fast excavation speed, and no influence from ground traffic and seasonal climate, especially in soft water-bearing strata. Larger, long-distance metro tunnels often have technical and economic advantages. Shield construction mainly includes soil excavation, shield tunneling control and deflection correction, segment assembly, segment back grouting and other processes, among which segment assembly and segment back grouting are the factors that determine the overall stability and safety of the shield tunnel structure. critical step in sexuality. [0003] In recent years, during the ...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a convex shield tunnel segment structure and construction method to solve the problems of segment radial staggering, complicated construction and assembly, and stress concentration during grouting construction in the related art

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