Splicing structure for pipe pieces of ellipse-like shield tunnel with stand column

Abstract

The invention relates to a splicing structure for pipe pieces of an ellipse-like shield tunnel with a stand column. An integral ring is formed by enclosing and splicing the pipe pieces. The adjacent integral ring pipe pieces are spliced to form the splicing structure for the pipe pieces of the shield tunnel. The splicing structure is characterized in that the cross section of the splicing structure for the pipe pieces of the shield tunnel is a double-axis symmetric smooth ellipse-like part provided with the center stand column and formed by four sections of inferior arcs, the double-axis symmetric smooth ellipse-like part comprises a top arc, a bottom arc, a left side arc and a right side arc, the top arc with the large radius and the bottom arc with the large radius are arranged vertically and symmetrically in the opposite directions, and the left side arc with the small radius and the right side arc with the large radius are transversely and symmetrically arranged in the opposite directions. The spliced joints of the adjacent integral ring pipe pieces on the cross section keep away from the most unfavorable stress part of the tunnel structure, and the adjacent integral ring pipe pieces are spliced through staggered joints. Annular connectors and the longitudinal connectors of the pipe pieces are connected through bolts and hand holes, plane contact pulling and anchoring type lacework box type hand holes are adopted in the annular connectors, and high bearing force is achieved. The splicing structure has the advantages that a tunnel arc bearing structure and the high rectangular structure space utilization rate are combined; the longitudinal hand holes are in double-axis symmetric arrangement, and one set of pipe pieces can meet the requirement for staggered joint splicing.

Description

technical field [0001] The invention relates to a segment structure form of a shield tunnel, in particular to a segment assembly structure of a similar elliptical shield tunnel with columns. Background technique [0002] At present, the shield method of urban tunnel construction has gradually become one of the main methods of urban tunnel excavation due to its advantages such as strong stratum adaptability, small environmental impact, high mechanization efficiency, construction information integration, and super-large diameter applicability. After decades of development, my country's shield technology has made great progress. From small municipal pipeline tunnels, to subway tunnels with a diameter of several meters, to large cross-river tunnels with a diameter of more than 15m, shield tunneling can be used for construction. , especially the circular shield tunnel, in a wide range of engineering practice, has summed up the full empirical results. The shield tunnel adopts a ci...

AI Technical Summary

Problems solved by technology

The shield tunnel adopts a circular shape as the basic geometric shape, mainly based on the advantages of the circular tunnel in terms of stress conditions and mechanical design, but its problem is that the space utilization rate is low and the lateral pressure coefficient is small. In the case of small stratum or buried depth, the advantages of the circular structure cannot be utilized due to the large difference in the confining pressure of the tunnel

For tunnels with relatively large lateral spans and relatively large heights, although double-circular tunnels can be used, due to the influence of the back-soil effect on the seagull blocks in the arch, the mechanical conditions of the double-circular tunnels are not good, and it is easy to cause water leakage in the tunnel

On the other hand, although the pure rectangular shield tunnel has a high space utilization rate, its structural force is unreasonable and its span is limited, which limits its application.

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