A construction method for a tunnel constructed from two halves of rectangular pipe joints with outer chamfers

Abstract

The invention discloses a construction method for a tunnel constructed by two semi-rectangular pipe sections with outer chamfer angles. The construction method comprises a pipe jacking construction stage and a shield construction stage which are sequentially performed; when the pipe jacking construction is performed until the maximal trust borne by rectangular pipe sections or working pits is achieved or the design requirement of the distances between the rectangular pipe sections and a tunnel opening is met, pipe jacking construction is stopped and the shield construction stage is started; when the shield construction stage is performed on the tail end of the tunnel, shield tail seal rings are arranged at the outer sides of the rectangular pipe sections and are V-shaped or U-shaped seal rings with long and short lips. The construction method for the tunnel constructed by the two semi-rectangular pipe sections with the outer chamfer angles is simple and easy in operation, high in mechanization degree and high in efficiency, is high in section utilization ratio in comparison with round shield construction, is long in pushing distance in comparison with rectangular pipe jacking construction, has favorable practicability and meets the use requirements. The used shield tail seal rings are unique in design and have favorable seal performance, so that leakage can be prevented.

Description

technical field [0001] The invention belongs to the technical field of tunnels, and in particular relates to a construction method for a tunnel constructed by two halves of rectangular pipe joints with outer chamfers. Background technique [0002] At present, most of the shields under construction are circular shields. The number of segments per ring is relatively large, and there are many sealing places, which are prone to leakage. Another thing is that the utilization rate of the circular shield section is not as high as that of the rectangular section. In addition, there are currently many rectangular pipe jacking constructions, which can improve the utilization rate of the section, but due to the constraints of the pipe jacking method itself, the jacking distance cannot be too long, so these two construction methods cannot fully meet the requirements need. Contents of the invention [0003] Purpose of the invention: In view of the deficiencies in the prior art, the ...

AI Technical Summary

Problems solved by technology

The number of segments per ring is relatively large, and there are many sealing points, which are prone to leakage

Another thing is that the utilization rate of the circular shield section is not as high as that of the rectangular section.

In addition, there are currently many rectangular pipe jacking constructions, which can improve the utilization rate of the section, but due to the constraints of the pipe jacking method itself, the jacking distance cannot be too long, so these two construction methods cannot fully meet the requirements need

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