Lime nail composite frame prestressed anchor tube structure and construction method for reinforcing weak slope

Abstract

Prestressed anchor pipe structure and construction method for reinforcing weak soil slope lime nail composite frame, the structure is composed of lime nails, prestressed anchor pipe, and frame; the frame is composed of beams and columns; It is composed of a hollow rod body and a drill bit. Use small mixing equipment to evenly mix the weak soil, lime and cement slurry to form micro-lime nails, arrange them at equal intervals on the soil to be reinforced, and ram the anchor pipe in the center of the square formed by the lime nails; inject anchor into the anchor pipe The agent is used as the frame, and the prestress is applied after the grout solidifies to form a lime nail composite prestressed frame anchor pipe.

Description

technical field [0001] The invention relates to foundation pit and side slope support technology in weak soil areas. Background technique [0002] In the construction of soft soil roads and construction projects, the support of slopes and foundation pits is mostly reinforced by frame prestressed anchor retaining walls. Due to the high natural water content of soft soil, large natural void ratio, low shear strength, and poor physical and mechanical properties of the soil itself, the pull-out bearing capacity of the anchor bolts installed in it is low, so the slope treated by support The height and the depth of the foundation pit are usually small, and if the depth is large, other support forms such as row piles or internal supports can only be used, resulting in high engineering costs and long construction periods. The traditional various sprayed anchor supports use pre-holed anchors, which are firstly drilled according to the design requirements during foundation pit or slo...

AI Technical Summary

Problems solved by technology

Due to the high natural water content of soft soil, large natural void ratio, low shear strength, and poor physical and mechanical properties of the soil itself, the pull-out bearing capacity of the anchor bolts installed in it is low, so the slope treated by support The height and depth of the foundation pit are usually small, and other support forms such as row piles or internal supports can only be used if the depth is large, resulting in high engineering costs and long construction periods

The traditional various sprayed anchor supports use pre-holed anchors, which are firstly drilled according to the design requirements during foundation pit or slope construction, and the steel strands or steel bars are placed together with the grouting pipe after drilling into the hole, and then perform grouting; however, it is easy to cause the collapse of the hole after applying the pre-formed hole in the soft soil area, which seriously reduces the work efficiency

In addition, because the grouting pressure is difficult to control, the effect of grouting is not ideal, and the grouting material is mainly ordinary cement, which makes the contact area between the anchor grouting body and the soil layer small and cannot provide large frictional resistance. The tensile capacity of the anchor is small, and the reinforcement effect cannot be achieved; the ordinary spray anchor support needs to use a large amount of steel mesh as the protective surface, resulting in high project cost

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