Longitudinal-tensioning-free pipe piece splicing structure for launching and receiving section and construction method of longitudinal-tensioning-free pipe piece splicing structure

Abstract

The invention discloses a longitudinal-tensioning-free pipe piece assembling structure for an initial receiving section and a construction method thereof.The pipe piece assembling structure comprises two pre-embedded inner sleeves and an assembling inner core, and each pre-embedded inner sleeve is provided with a connecting groove concaved inwards from the end face; the splicing inner core comprises a first core body and a second core body, when the two pipe pieces are longitudinally installed, the first core body and the second core body are inserted into the corresponding connecting grooves respectively, the two pipe pieces are longitudinally aligned and spliced up and down and inside and outside through interlocking of the protruding parts and the connecting grooves, and the splicing inner core is hidden in the connecting grooves of the two aligned and spliced pipe pieces. The problems of slab staggering, opening and uneven stress of inner and outer cambered surfaces among the segments are solved, the inner and outer wall surfaces of the formed segment ring are spliced neatly and attractively, space is not occupied, meanwhile, the longitudinal tensioning-free effect is achieved, the bearing capacity and durability are ensured due to the fact that built-in is not prone to corrosion, and in addition, the segment ring is simple in structure, convenient to assemble and low in cost. And smoke dust, harmful gas and noise pollution cannot be generated.

Description

technical field [0001] The invention belongs to the technical field of shield tunnel construction, and in particular relates to a segment assembly structure for the originating and receiving section free of longitudinal tension, and also relates to a segment for the originating and receiving section without longitudinal tensioning Ring butt construction method. Background technique [0002] In recent years, with the rapid development of social economy and urbanization, shield tunnel technology has become an indispensable key technology in infrastructure construction such as major transportation in my country. In the important risk stages of shield tunneling construction such as shield initiation, reception or shallow overburden, due to the small surrounding water and soil pressure, and even no water and soil pressure at the negative ring, the assembly of the segment ring is difficult and difficult to fix. The self-stabilizing ability is poor, and it is prone to opening and ...

AI Technical Summary

Problems solved by technology

[0004] 1. The uneven force on the inner and outer arc surfaces of the segment is likely to cause local damage. The welded steel plate is usually set on the inner arc surface of the segment, which can easily lead to the increase and damage of the local internal force of the segment structure;

[0005] 2. The installation process is complicated, which will affect the speed of segment assembly, and will generate relatively large smoke, harmful gases and noise pollution;

[0006] 3. The steel plate welded on the inner curved surface of the segment is easy to conflict with other internal structures of the segment, and affects the flatness and aesthetics of the segment;

[0007] 4. Welded steel plates are prone to rust in humid environments or when water leaks in tunnels, which affects the bearing capacity and durability of the reinforced structure;

[0008] 5. The structure of the joint between the rings mostly adopts the concave-convex tenon structure, but the concave-convex tenon structure cannot provide longitudinal tension and cannot control the opening between the segment rings, and the pure shear can be converted into curved shear after the tenon and the groove are in contact. Combination, although the shear stiffness between the rings is increased, but at the same time it will cause the segments between the rings to open

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