City subway overlapped shield tunnel segment structure adopting special longitudinal connecting pieces

Abstract

The invention discloses a city subway overlapped shield tunnel segment structure adopting special longitudinal connecting pieces. The city subway overlapped shield tunnel segment structure is formed by splicing a plurality of annular segments. A plurality of steel clamping grooves are embedded in the two sides of the segments annularly. Every two adjacent segments are longitudinally connected through the multiple steel connecting pieces. The two ends of each steel connecting piece are buckled in the corresponding steel clamping grooves in the two corresponding adjacent annular segments. The connecting pieces adopting the embedding and buckling technology are easy and convenient to manufacture and install. A cavity formed after the connecting pieces are assembled is filled and compacted through embedded holes, so that it is ensured that the connecting pieces are fastened and reliable and meet the requirement for durable using. By the application of the city subway overlapped shield tunnel segment structure, conventional tunnel periphery soil body passive enforcement is changed into tunnel segment active enforcement in the overlapped tunnel design, the longitudinal tension, bending and transverse shear resisting performance of the tunnel is greatly improved, the downward shield tunnel enforcement measure is simplified, the building cost of projects is reduced, and the influences of upward tunnel running train dynamic loads on a downward tunnel are reduced.

Description

technical field [0001] The invention belongs to the technical field of civil engineering, and in particular relates to an urban subway overlapping shield tunnel segment structure using special longitudinal connectors. Background technique [0002] At present, with the development of urban rail transit, due to factors such as geological conditions, surrounding buildings, underground space development and operational requirements, it is sometimes inevitable to produce close-distance overlapping shield tunnels in projects. This type of tunnel can better solve the route layout of limited road sections, but it often causes some problems due to the small clear distance. Usually, the uplink tunnel is built after the downlink tunnel is completed, and the construction of the uplink tunnel will inevitably affect the structure of the downlink tunnel. Under stress, the deformation of the downlink tunnel requires greater stiffness in the longitudinal joint connection of the shield tunnel...

AI Technical Summary

Problems solved by technology

[0007] Although the above-mentioned technologies can reduce the impact of the uplink tunnel on the downlink tunnel during construction, the implementation operation is relatively complicated and the cost is high, and the impact of overlapping uplink tunnel operation on the downlink tunnel has not been solved. It is of great engineering significance to strengthen the tunnel structure, reduce the project cost and reduce the impact of the dynamic load of the operating train.

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