Static piling method using jet grouting pile for disturbing hardpan under limited clearance conditions at tidal waters

Abstract

The invention discloses a static piling method using a jet grouting pile for disturbing a hardpan under limited clearance conditions at tidal waters. The static piling method comprises the steps of filling of clay cofferdams at the bottom of a bridge for providing a construction platform; protection of an original bridge pier; reverse excavation of a trench in the construction platform; construction of steel sheet pile cofferdams; support in a channel box and construction of earth excavation; backfill of a foundation pit and removal of circuit purlin; and removal of steel sheet piles. According to the static piling method, the steel sheet pile cofferdams are constructed under the limited clearance conditions at tidal influence waters; firstly, the clay cofferdams are filled for providing the construction platform; then, the trench is reversely excavated in a soil construction platform, and a static piling machine is placed in the trench for static pressure piling construction of the steel sheet piles; and the problem of inadequate clearance for construction of the steel sheet piles is solved, and the water tightness and integrality of the steel sheet piles are ensured. When the problem that a substratum is a hard sand layer and consequently the steel sheet piles can not be driven in position occurs during static piling construction of the steel sheet piles, with the method thathigh-quality mud is sprayed under high pressure through the jet grouting pile for loosening a soil layer, the piling resistance is reduced, so that the steel sheet piles are driven to the designed elevation successfully.

Description

technical field [0001] The invention relates to the technical field of municipal engineering, in particular to a method for statically planting piles in hard stratums disturbed by rotary spraying piles under the condition of limited clearance in tidal waters. Background technique [0002] With the large-scale construction of the urban sewage pipe network system, in order to save land and alleviate the problems of land acquisition and demolition, more and more drainage structures are built under the existing riverbed. ——Shijing River Main Stream (Shijing River, Xinshichong) Sewer Interception Ditch Box (Shijing River Section) Project” requires building a 20km-long culvert under the riverbed near the bank, and the foundation pit support of the sewage interception ditch box basically adopts Steel sheet pile support, but the main stream of Shijing River (Shijing River, Xinshiyong) passes through three bridges, and there are other unfavorable factors. For example, when passing th...

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Problems solved by technology

[0003] Based on the deficiencies of the prior art, the technical problem to be solved by the present invention is to provide a static pile planting method for rotary grouting piles disturbing hard stratum under the condition of limited clearance in tidal waters. Pile cofferdams are difficult to construct when encountering obstacles such as bridges, the lower clearance is limited, and there are unfavorable conditions such as underlying hard sand layers under the river bed

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