Semi-rigid pipe joints for immersed tunnels

Abstract

The invention relates to the technical field of pipe joints for immersed tunnels, in particular to a semi-rigid pipe joint for an immersed tunnel. The semi-rigid pipe joint for the immersed tunnel comprises a pipe joint body, wherein the pipe joint body is formed by a plurality of pipe joint sections in a splicing mode, the pipe joint sections are connected end to end, a tenon structure is arranged between every two adjacent pipe joint sections, a plurality of prestressed ducts are arranged in the pipe joint body in the circumferential direction of the pipe joint body, prestressed steel beams which are used for carrying out prestressed degree adjustment on the pipe joint sections correspondingly penetrate through the prestressed ducts, and prestressed anchorage devices are arranged at the two ends of the pipe joint body. Due to the fact that the design of the prestressed steel beams is adopted, the pipe joint sections can be connected in series, the pipe joint sections can be connected in series to form a whole in a splicing mode, and the pipe joint body can have a certain flexibility on the premise that the overall rigidity is not lost; the semi-rigid pipe joint for the immersed tunnel has higher degree of stress safety and higher degree of waterproof safety compared with a section type flexible pipe joint, and has better capacity of adapting to foundation deformation compared with an integral rigid pipe joint.

Description

technical field [0001] The invention relates to the technical field of pipe joints for immersed tube tunnels, in particular to a semi-rigid pipe joint for immersed tube tunnels. Background technique [0002] At present, the pipe joint structures for immersed tunnels that have been built at home and abroad are mainly divided into two types: segmental flexible pipe joints and integral rigid pipe joints. [0003] Flexible pipe joints are connected by multiple end-to-end pipe joint segments, and the pipe joint segments are connected by matching mortise-convex structures and buried waterstops across the joints; the immersed pipe structure mainly exhibits flexibility characteristics under external loads, and the pipe joints The segmental joints are opened and rotated, and the bending moment of the pipe joint is released through deformation. The longitudinal force of the structure is small, and the longitudinal reinforcement is less. There are risks in the water stop between secti...

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Problems solved by technology

[0003] Flexible pipe joints are connected by multiple end-to-end pipe joint segments, and the pipe joint segments are connected by matching mortise-convex structures and buried waterstops across the joints; the immersed pipe structure mainly exhibits flexibility characteristics under external loads, and the pipe joints The segmental joints are opened and rotated, and the bending moment of the pipe joint is released through deformation. The longitudinal force of the structure is small, and the longitudinal reinforcement is less. There are risks in the water stop between sections, and the risk is even greater for heavy load or soft foundation immersed tunnels; there are many cases of water leakage between flexible pipe sections around the world;

[0004] Rigid pipe joints are composed of integral pipe joints or multiple end-to-end pipe joint segments connected by bonded prestress. The pipe joints resist external loads with overall rigidity, and the longitudinal force of the pipe joint structure is relatively large, which requires a large cost ( Configure a large number of steel bars or prestressed) to improve its bearing capacity; at the same time, the rigid pipe joints cannot redistribute the internal forces of the structure through the flexible deformation of the pipe joints, the internal forces of the structure are unbalanced, and there are risks of cracking and water leakage in the long-term high stress areas with large forces , in addition, the deformation of rigid pipe joints is concentrated at both ends of long pipe joints, increasing the requirements for GINA water-stop products at this place

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