Construction method of jet-grouting pile and composite soil-nailed wall support for deep foundation pit construction

Abstract

The invention discloses a construction method of jet-grouting pile and composite soil-nailed wall support for deep foundation pit construction. The construction method comprises the following steps of (1) preparing for construction; (2) excavating, paying off, and finishing slopes; (3) cleaning side slopes; (4) constructing a jet-grouting pile; (5) spraying concrete for the first time; (6) forming holes; (7) inserting soil nail steel bars; (8) grouting; (9) laying steel bar nets; (10) spraying concrete for the second time; (11) constructing anchor rods; (12) applying prestress on soil nails; (13) manufacturing bottom beams. According to the construction method, the jet-grouting pile and a soil-nailed wall are combined for support, so that the bearing capacity is greatly increased, additionally, the self-bearing capacity of a soil body is reasonably utilized, and the soil body is used an integral part of a support structure; the structure has the advantages of light weight, large flexibility, good vibration resistance and malleability, stability, reliability, small displacement of support rear side slopes, strong overload capacity and short total construction time and can be excavated and supported at any time; compared with other deep foundation pit support types, the construction method has the advantages of low cost and high economic benefit.

Description

technical field [0001] The invention relates to a construction method for deep foundation pit building rotary grouting pile composite soil nailing wall support. Background technique [0002] With the rapid development of my country's social and economic construction, urban construction land is increasingly competitive, and construction projects gradually develop and utilize underground space, making people and industry professionals pay more and more attention to the quality and safety of deep foundation pit engineering support construction. The traditional deep foundation pit support has high construction cost, long construction period, cannot adapt to foundation pit support under complex geological conditions, and its performance is unreliable, and the support effect is not ideal. [0003] The traditional deep foundation pit support construction is greatly affected by the soil quality. In cold weather, the construction of concrete is difficult, and the strength of the conc...

AI Technical Summary

Problems solved by technology

Although the cost is low and the construction period is short, since the support structure only plays a supporting role in the vertical direction, the side walls of the deep foundation pit are not reinforced, which may easily cause the collapse of the deep foundation pit wall, and there is a certain degree of safety. Hidden danger

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