Combined soil nailing construction method

Abstract

The invention relates to a combined soil nailing construction method, which belongs to the field of geotechnical engineering, and includes the steps as follows: step 1, preliminary grouting is vertically performed at the top of a slope; step 2, earth is excavated to form a sloping surface, and bottom layer concrete is sprayed on the sloping surface; step 3, injected holes are distributed in a concrete surface formed in the step 2 and holes are drilled, wherein drill stems of drilling tools are steel pipes, and the steel pipes are left in the holes to serve as grouting pipes after the holes are formed; step 4, the grouting pipes are grouted, then rigid rod pieces are inserted in the pipes to form combined soil nails; step 5, panel tie pieces are placed on the sloping surface, and are enabled to be jointed with exposed heads of the rigid rod pieces in the step 4; and step 6, surface layer concrete is sprayed on the panel tie pieces, and the construction is completed. The method provided by the invention solves the supporting problem of soil layers with poor soil strength, and has the advantages of low construction cost and short construction period.

Description

Technical field [0001] The invention relates to a soil nail support construction method, more specifically to a combined soil nail support construction method suitable for loose soil foundation pits. Background technique [0002] Soil nailing is a new type of soil retaining technology used to maintain soil excavation and slope stability. Because of its low construction cost, simple method, fast speed and reliable construction quality, it is widely used in foundation pit engineering. [0003] The soil nailing support is highly dependent on the nature of the soil layer of the construction site. Generally speaking, the soil layer suitable for soil nailing should have a certain degree of cementation and compactness, such as sand, silt, gravel soil, plain fill and hard or hard plastic cohesive soil. [0004] However, for loose, weak, and weak soil layers, such as loose sand and soil layers with abundant underground water sources, traditional soil nail support, especially saturated clay ...

AI Technical Summary

Problems solved by technology

In addition, the creep of soft soil may significantly increase the support displacement and fail to achieve the expected strengthening effect

[0005] In addition, during construction, due to the loose, weak, and poor soil stability of the soil layer, the soil deforms during the excavation process, the hole is easy to collapse after the hole is formed, and it is difficult to make the hole under the steel bar. Therefore, it is difficult to form a hole with traditional soil nails. Difficult to meet design requirements

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