Construction method for one-time horizontal backfill of concrete in pipe roofing steel pipe

Abstract

The invention discloses a construction method for one-time horizontal backfill of concrete in a pipe roofing steel pipe. First blocking steel plates are welded to the two ends of pipe roofing, an infusion hole is reserved in the middle of the first blocking steel plate, exhaust holes are reserved in the upper portion of the first blocking steel plate, and an exhaust hole and a grouting hole are reserved in a grouting end. An infusion valve is mounted at a pumping end. A pumping pipeline and pumping equipment are arranged and fixed from the pumping end to the rear side. The pumping equipment isutilized for pumping self-compaction micro-expansion concrete into the pipe roofing from the pumping end, the exhaust hole of the grouting end is opened, and pumping pressure is monitored in real time; and after grout is discharged out from the exhaust hole of the grouting end, pumping of the self-compaction micro-expansion concrete is stopped, and the infusion valve and the exhaust hole are closed. According to the construction method for one-time horizontal backfill of the concrete in the pipe roofing steel pipe adopting the above technology, a series of technical problems that pipelines inlong-distance large-diameter curve steel pipes are staggered complexly, longitudinal gradient is small, and horizontal pipeline concrete backfill is hard are solved, and a safe, reliable, efficient,economical and practical filling technology is provided.

Description

technical field [0001] The invention relates to the technical field of concrete filling in pipes after pipe curtain construction is completed, in particular to a construction method for one-time horizontal backfilling of concrete in steel pipes of pipe curtains. Background technique [0002] The underground excavation section of the Gongbei Tunnel Port of the Zhuhai Link of the Hong Kong-Zhuhai-Macao Bridge is the first time at home and abroad to adopt the combined construction technology of "super-large pipe curtain maintenance structure plus horizontal freezing water stop". The length of the underground excavation section is 255m, the plane alignment is 88m, the transitional curve is added to the 167m circular curve, and two working wells are set at both ends, which are the originating and receiving wells. The pipe curtain is composed of 36 steel pipes with a diameter of 1620mm, including 17 steel pipes in the upper layer with a wall thickness of 20mm; and 19 steel pipes i...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a construction method for one-time horizontal backfilling of concrete in steel pipes of pipe curtains, which solves a series of technologies such as long distances, large diameters, curved steel pipes, complex interlacing of pipelines in pipes, small longitudinal slopes, and horizontal pipe concrete backfilling. To solve the difficult problem, a safe, reliable, efficient, economical and practical one-time filling construction technology is proposed, which fills the blank of long-distance large-diameter concrete one-time horizontal backfilling technology

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