Jacking-pushing-type final joint for immersed tunnel and butt-joint construction method thereof

Abstract

The invention provides a jacking-pushing-type final joint for an immersed tunnel and a butt-joint construction method thereof, and belongs to the technical field of immersed tunnel construction. Underwater water stop and push stop of the final joint after jacking pushing can be quickly and effectively achieved, the water stop and push stop effects are good, and the safety is high. The jacking-pushing-type final joint comprises a connecting bearing opening formed in a to-be-mounted pipe segment, further comprises a jacking pushing piece, and further comprises a water stop assembly. A jacking pipe section is sleeved with the connecting bearing opening, a cavity capable of containing the jacking pushing piece is formed in the connecting bearing opening, and a grouting pipe is pre-embedded inthe cavity. The water stop assembly comprises three water stop belts; the first water stop belt is arranged at the end face of the pushed-out end of the jacking pipe section; the second water stop belt and the third water stop belt are both arranged on the periphery of the jacking pipe section; the second water stop belt can extend along with pushing out of the jacking pipe section; one end of thesecond water stop belt is fixedly connected to the jacking pipe section, and the other end of the second water stop belt is fixedly connected to the connecting bearing opening; and the third water stop belt is connected between the jacking pipe section and the connecting bearing opening in a sleeved mode.

Description

technical field [0001] The invention belongs to the technical field of immersed tube tunnel construction, and in particular relates to a push-type final joint of an immersed tube tunnel and a butt joint construction method thereof. Background technique [0002] In the installation of the pipe section of the immersed tube tunnel, in order to make the last pipe section sink smoothly, a space longer than the distance of the pipe section must be reserved. After the last pipe section is lowered, the end surface of the last pipe section needs to be connected with the previous pipe section through a connection structure, which is the final joint. [0003] With the development of immersed tunnel construction technology, the forms of final joints are becoming more and more diverse, such as: V-shaped block final joints, K-section final joints, and push-push final joints. Among them, the push-type final joint is often pushed by setting a push-up beam and several jacks in the steel str...

AI Technical Summary

Problems solved by technology

However, the water-stopping and thrusting effect of the push-type final joint of the existing structure is becoming more and more difficult to meet the stringent requirements for underwater water-stopping and thrusting under complex construction conditions. For the push-type final joint, underwater The two major problems of water stop and thrust are still the core problems that limit its further development. Solving this problem can achieve a breakthrough in the final joint

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