Construction method for pouring concrete at back of tunnel-through steel pipe

Abstract

The invention discloses a construction method for pouring concrete at the back of a tunnel-through steel pipe. The technical scheme is as follows: the construction method comprises preparatory work, pouring of first-stage concrete, pouring of second-stage concrete, grouting construction and preservative treatment. The construction method specifically comprises the following steps of mounting an exhaust pipe and a grouting pipe on the tops of annular layers of the tunnel-through steel pipe and a concrete pipe, and building walls at two ends of the annular layers to block the annular layers; forming a plurality of ash filling ports in the top end of the tunnel-through steel pipe; communicating pouring pipes to the ash filling ports, and starting pouring of the first-stage concrete; when theheight of the concrete is close to the height of the middle of the tunnel-through steel pipe, moving the pouring pipes to the next ash filling port for repeating the pouring step; mounting the pouringpipes again, and starting pouring of the second-stage concrete; during uniform and stable grout leakage of the next ash filling port, stopping pouring, and moving the pouring pipes to the next ash filling port to block the poured ash filling ports permanently; carrying out grouting to the grouting pipe to fill a top cavity fully; and carrying out preservative treatment on the ash filling ports. The construction method has the advantages that the poured self-sealed concrete is fuller and the slurry supplementing amount is reduced.

Description

technical field [0001] The invention relates to the technical field of tunnel-piercing construction technology, in particular to a construction method for pouring concrete behind a tunnel-piercing steel pipe. Background technique [0002] Water conveyance tunnel is an important part of water diversion and diversion projects. At present, multi-layer lining is often used. Generally speaking, it includes: outer-lined concrete pipe, inner-lined hole-piercing steel pipe and filling between the outer lining and inner lining. Self-compacting concrete in the annular layer, etc. [0003] Referring to the Chinese patent with the patent application number CN201811628435.5, the current scheme of backfilling concrete in the annulus includes a tunnel body and a steel pipe installed in the tunnel body, an interlayer is left between the tunnel body and the steel pipe, and the The two ends of the interlayer are closed, and an exhaust port is reserved. A pouring pipe is arranged at intervals...

AI Technical Summary

Problems solved by technology

[0005] The above scheme has the following disadvantages: when pouring one ash pouring port and pouring the next ash pouring port, the concrete at the poured ash pouring port will flow to the area that has not yet been poured, so that the poured ash pouring port will The height of the concrete at the place is reduced; after the pouring is completed, there is a large void layer on the top of the backfilled concrete, which requires a lot of grouting treatment, resulting in increased costs, and the strength of the backfilled grout at the top of the annular layer is low after solidification

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