Non-excavation combined reinforcement construction method

Abstract

The invention relates to a non-excavation combined reinforcement construction method. The technical problems that in the prior art, soil and sand flow, hole collapse and the like are caused by instability of the hole wall of a drilled hole in the non-excavation pipeline construction process are solved. The method comprises the following steps that firstly, two groups of steel sheet piles are driven into a determined instability range section to form a lateral support and a lateral waterproof curtain; grouting is conducted in the area between the two groups of steel sheet piles, a local rock-soil body is reinforced through grout, and a reinforcing arch and a water stop structure above the reinforcing arch are formed; two ends of the reinforcing arch are respectively connected with the two groups of steel sheet piles to form an integral water stop support; and pipeline laying construction is carried out in an area limited by the integral water stop support. The steel sheet piles are adopted for lateral supporting of the instability range, lateral deformation is controlled, the grouting reinforcement range is limited, and the water stop effect is achieved. Steel sheet pile supporting and clamping are combined with a reinforcing body to form the arch, the arch effect is fully utilized to disperse the pressure of an upper covering layer, the overall water stopping effect is achieved, and ground collapse caused by continuous collapse is avoided.

Description

technical field [0001] The application belongs to the technical field of trenchless construction methods, and in particular relates to a trenchless combined reinforcement construction method. Background technique [0002] In recent years, with urban development and construction, trenchless construction has developed rapidly. During non-excavation construction, it is inevitable to encounter water-rich sandy soil strata or other saturated soft soil strata. Under the action of groundwater seepage, it is easy to cause flowing soil and quicksand on the hole wall, and local soil layer collapse and instability. Timely reinforcement and water-stop treatment, instability and collapse will continue to evolve and intensify under the action of groundwater, which will lead to accidents of drill stuck and buried drill, and in severe cases, the drill hole will be scrapped or the ground will collapse. During the actual drilling construction process, borehole blockage and local collapse cau...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the technical problems caused by the instability of the borehole wall in the prior art in the process of trenchless pipeline construction, such as soil flow, sand flow and hole collapse, the present invention provides a trenchless combined reinforcement construction method, using steel sheet piles Combining with high-pressure grouting to form an arch to strengthen the hole wall

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