Shield segment structure and shield tunnel

Abstract

The invention discloses a shield segment structure and a shield tunnel. The shield segment structure comprises a plurality of segments, wherein the segments are defined and spliced to form an integral ring; a cross section of the integral ring is a centrosymmetric and axisymmetric special-shaped face; the special-shaped face is formed by defining eight inferior arcs; the eight inferior arcs are a top inverted arch and a bottom inverted arch which are arranged vertically, oppositely and symmetrically, a left arch and a right arch which are arranged horizontally, oppositely and symmetrically, and four corners respectively; the segments are centrosymmetrically distributed on the integral ring; spliced seams, located on the cross section, of the adjacent segments are staggered with maximum internal force parts of the corners, and symmetry axes; a plurality of shield segment structures are butted to form the shield tunnel; and the spliced seams of the segments of the adjacent shield segment structures are arranged in a staggered manner. The shield segment structure and the shield tunnel can well integrate factors such as transverse internal force distribution of the shield tunnel, and connection of the longitudinal segments, so that the shield segment structure and the shield tunnel have good integrity, high efficiency and implementability.

Description

technical field [0001] The invention relates to the technical field of tunnel structures, in particular to a shield segment structure and a shield tunnel. Background technique [0002] In the soft soil area, the traditional shield tunnel is constructed by a single-round shield machine, and its cross-section is circular. With the continuous improvement of people's requirements for underground roads and rail transit, the scale of shield tunnels continues to increase, and almost all of them adopt the form of circular cross-sections. Although the technology of shield tunnel with circular section is mature, it still has the following deficiencies: (1) the effective use area of ​​circular section is small, and the structural section cannot be fully utilized; (2) the amount of earthwork produced by shield tunneling during excavation is large , which directly increases the engineering cost of the tunnel; (3) The buried depth of the shield tunnel is about 1.0D (D is the diameter of ...

AI Technical Summary

Problems solved by technology

Although the technology of shield tunnel with circular section is mature, it still has the following deficiencies: (1) the effective use area of ​​circular section is small, and the structural section cannot be fully utilized; (2) the amount of earthwork produced by shield tunneling during excavation is large , which directly increases the engineering cost of the tunnel; (3) The buried depth of the shield tunnel is about 1.0D (D is the diameter of the shield), which increases the excavation depth of the shield working well and the open-cut and buried section, which indirectly increases the Project risk and cost

[0004] (1) The mechanical performance of the rectangular section is poor, and the internal force of the section is large, resulting in an excessively large structural reinforcement ratio;

[0005] (2) The size of the existing rectangular section is small, which cannot meet the needs of urban economic development and municipal construction, especially cannot be used in underground municipal road projects;

[0006] (3) At present, the lining of large-section rectangular shield tunnels is still in the form of cast-in-place, which is not conducive to the construction period and quality control of the tunnel

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