Construction method of temporary support of double-hole three-pipe gallery immersed tunnel and its vertical jack

Abstract

The invention discloses a perpendicular jack system for a temporary support of a twin-pore immersed tube tunnel with three tube corridors. The perpendicular jack system comprises a perpendicular jack. An upper embedded part of the perpendicular jack is welded at the upper end of the perpendicular jack, a push rod of the perpendicular jack is welded at the lower end of the perpendicular jack, and the perpendicular jack is respectively fastened with the upper embedded part and the push rod, which are arranged at the two ends of the perpendicular jack, by bolts; the lower portion of the push rod penetrates a lower embedded part of the perpendicular jack, a compression sleeve is arranged between the push rod and an upper port of the lower embedded part, the lower embedded part is connected with the compression sleeve in a threaded manner, sealing packing is arranged below the compression sleeve, and an O-shaped rubber sealing ring is arranged between the push rod and a lower port of the lower embedded part; a grouting tube is arranged on the lower embedded part. The perpendicular jack system has the advantages that a three-point support mode is adopted, in other word, nose supports are arranged at the front end of a tube section, the perpendicular jack is arranged at the tail end of the tube section, the tail section of the tube section is arranged in partition walls of two side tube corridors in a supported manner, a transverse distance is long, accordingly, longitudinal and transverse structures of the integral tube section are stressed reasonably, the tube section is good in integral stability in tube section pull-in procedures, and the quantity of structure reinforcing steel bars can be correspondingly reduced.

Description

technical field [0001] The invention relates to a temporary support structure of an immersed tube tunnel, in particular to a temporary support structure after the pipe section is sunk and placed in place. Background technique [0002] The temporary support method after the pipe section sinks into place usually uses a nose pad at the butt end and a vertical jack at the other end, and there is also a precedent for all vertical jacks. Looking at the immersed tube tunnels that have been opened to traffic in China in recent years, the Guangzhou Pearl River Tunnel, the Ningbo Yongjiang Tunnel and the Shanghai Outer Ring Tunnel adopt a four-point support method. The specific method of the four-point support is: each pipe joint needs to be equipped with four supports The jack and the corresponding four temporary supports, and the two supporting jacks near the butt end of the pipe joint replace the lifting jack. But at this time, two docking positioning beams need to be placed on th...

AI Technical Summary

Problems solved by technology

The main shortcomings of the four-point support method are: low positioning accuracy, four-point support to adjust the design elevation, the required divers and diving construction time increase, and the construction is difficult

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