Underground pipeline excavated pipe joint prestress connecting method

Abstract

An underground pipeline excavated pipe joint prestress connecting method relates to the technical field of construction, and aims at solving the technical problem of improving the whole rigidity, stability and tensile capacity of the pipe joint. The method is characterized in that reinforcing steel bars are embedded in the pipe joint, and the reinforcing steel bar extends to the front end and theback end of the pipe joint to form an extending section; the connecting step between two sections of pipe joints is as follows: 1) the extending section of the embedded reinforcing steel bar of the front end of the back section of pipe joint is connected with that of the front section of pipe joint by a connector and is screwed down, and then the back section of pipe join is arranged to be close to the front section of pipe joint; 2) a prestress nut is sleeved on the extending section of the embedded reinforcing steel bar of the back end of the back section of pipe joint and is screwed down, the extending section of the embedded reinforcing steel bar of the back end of the back section of pipe joint is connected to be longer through a connector, and then the back section of pipe joint is prestressed by a jack and a buttress. The method of the invention can effectively control the upcast and downcast in pipe jacking construction, and the problems of water leakage and disjointing between the pipe joints, and can adopt draw tube construction.

Description

technical field [0001] The invention relates to an underground construction technology, in particular to a technology for a pipe joint prestressed connection method used for underground pipeline excavation such as box culverts and pipe culverts. Background technique [0002] Pipe jacking construction is a kind of underground excavation construction method when underground pipelines such as underground box culverts and pipe culverts cross roads, rivers, buildings and other obstacles. During construction, the prefabricated pipe joints are pushed to the design position with jacks by jacking while excavating. This construction method has the characteristics of small construction excavation surface, low noise and low economy, and is widely used in urban underground pipeline projects. [0003] At present, when the pipe jacking method is used for construction, the connection between the pipe joints is all connected by the free surface without coupling force. Due to the extremely ...

AI Technical Summary

Problems solved by technology

Due to the extremely small overall rigidity of the pipe joints and the machine head, it is easy for the machine head to "throw up" or "kowtow", and the pipe joints as a whole are easy to lose stability, and there will be water leakage caused by insufficient coupling force between pipe joints , in severe cases, it will lead to disconnection between pipe joints, and the pipe joints connected by this method do not have tensile properties as a whole, and the pipe drawing construction of pipe joints cannot be realized, which limits the application of prefabricated pipe joints under various complex conditions

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