Upper and lower integrated shield tunnel segment lining structure

Abstract

An upper and lower integrated shield tunnel segment lining structure, including an upper tunnel and a lower tunnel, characterized in that: the upper tunnel and the lower tunnel form an "8"-shaped integrated shield tunnel segment lining structure, which The specific composition is: the arc-shaped upper segment is assembled in the circumferential direction to form a superior arc-shaped upper tunnel segment ring, and the circular-arc-shaped lower segment is assembled in the circumferential direction to form a superior arc-shaped lower tunnel segment ring; the upper tunnel segment The ring and the lower tunnel segment ring are assembled through shaped special-shaped connecting segments to form an "8"-shaped structural ring; multiple structural rings are assembled longitudinally to form an "8"-shaped integrated shield tunnel segment lining; the special-shaped connection The structure above the segment is the upper tunnel, and the structure below is the lower tunnel. This kind of upper and lower integrated shield tunnel segment lining has strong integrity, high strength and good bearing capacity, can effectively control ground settlement, ensure the safety of surrounding buildings and structures, reduce construction difficulty and improve construction efficiency.

Description

technical field [0001] The invention relates to a shield tunnel segment lining structure. Background technique [0002] With the continuous improvement of the degree of mechanization and manufacturing level, the shield construction technology has gradually become the main method for the construction of underground projects such as urban underground railways because of its advantages such as less disturbance to the ground, less impact on the environment, and faster construction speed. The subway shield tunnels are mostly double-line tunnels, usually with parallel left and right lines. However, under special geological conditions, in order to avoid certain underground buildings and structures, the subway double-track tunnel will adopt an overlapping shield tunnel with upper and lower separation. The upper and lower overlapping shield tunnels are excavated by the shield machine, and the segments are assembled first and then to form two separated lower and upper tunnel structur...

AI Technical Summary

Problems solved by technology

There are many engineering difficulties and disadvantages in the construction process of separate overlapping shield tunnels: (1) additional stress will be generated on the lower tunnel during the excavation process of the upper tunnel, which will cause the deformation of the lower tunnel; (2) after the construction of the upper tunnel The unloading effect may cause the uplift of the downline tunnel; (3) the support speed of the downline tunnel support must match the assembly speed of the upline tunnel, otherwise the tunnel will be deformed; (4) the vertical height of the construction process is large, and the ground and superstructure The influence of objects is relatively large, and the control of land subsidence is difficult

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