A construction method of pipe curtain method support structure

Abstract

A construction method of a pipe curtain method support structure, the method comprises the construction of a water-stop curtain and the construction of a pipe curtain. Surrounding rock, to form a load-bearing arch, inject expansive soil modified reinforcement agent into the grouted steel pipe of the pipe curtain, the expansive soil modified reinforcement agent flows out through the grouting hole on the grouted steel pipe and penetrates into the surrounding soil layer, so that the surrounding soil layer is improved It improves the shear strength of expansive soil and reduces the free expansion rate of expansive soil, thereby improving the support effect under the premise of reducing the use of steel pipes. The invention effectively combines the modification of the expansive soil and the pipe-curtain method to achieve effective support for the project and long-term prevention and control of the later stability.

Description

technical field [0001] The invention belongs to the field of road and bridge construction, and particularly relates to a construction method of a pipe-curtain method supporting structure in an expansive soil layer. Background technique [0002] In the process of underground engineering construction, special soil layers and landforms such as loess, expansive soil and sandy soil are often encountered. Due to the particularity of the soil layer, it brings great difficulties to the construction, and a large-area pipe curtain structure is usually used. For support, in the water-rich strata, the pipe curtain freezing method is mostly used for construction, but in the actual construction process, most of the projects are in unsaturated strata, and these strata cannot have enough pore water to form sufficient freezing. Wall, and the freezing equipment is more complicated, which greatly increases the cost of the project, and the construction of large-scale pipe curtains is a huge cha...

AI Technical Summary

Problems solved by technology

[0002] In the process of underground engineering construction, special soil layers and landforms such as loess, expansive soil, and sandy soil are often encountered. Due to the particularity of the soil layer, the construction has brought great difficulties, and a large-area pipe curtain structure is usually used. For support, the pipe curtain freezing method is often used for construction in water-rich strata, but in the actual construction process, most of the projects are in unsaturated strata, and these strata cannot have enough pore water to form sufficient freezing wall, and the freezing equipment is relatively complicated, which greatly increases the project cost, and the construction of large-scale pipe screens is a huge challenge for the jacking equipment and related support measures, and the engineering cost is extremely high, which still needs strong support in the later stage to maintain The stability of the project, so for this kind of engineering problems, there are quite a lot of methods in the improvement process of the pipe curtain method, but none of them can effectively solve the problem