Variable-diameter multi-direction anchor pile

Abstract

The invention provides a variable-diameter multi-direction anchor pile, which is an anchor body for reinforcing and supporting soft rock and soil in geotechnical engineering. As the bond force betweensoft rock-soil masses and the anchor body is limited, only grouting, rotary jet, stirring or anchor pull is not big in effect of improving the strength and stability of the soft rock-soil masses, lowin reinforcing speed, difficult to control reinforcing effect and the like, thus the application range of the soft rock-soil masses is often limited. Therefore, the variable-diameter multi-directionanchor pile is invented and has the specific characteristics that a soft rock-soil layer is drilled through special equipment, and cement slurry and other cementitious materials are sprayed to be mixed well with cut broken rock-soil masses; quick strengthener is added at the same time; stirring-rotating direction and rotary jet pressure are controlled; and a special anchor part is added so as to form a variable-diameter multi-direction anchor body. The diameter of the formed anchor pile can reach 300 to 15,000 millimeters.

Description

1. Technical field: [0001] The invention relates to an anchoring method for reinforcing and supporting weak rock and soil in geotechnical engineering, in particular to a technology for actively reinforcing and supporting weak rock and soil. 2. Background technology: [0002] When strengthening and supporting weak rock and soil layers, the commonly used methods are retaining walls and bracket support structures, which are all passive support methods; and the commonly used active support methods are: grouting reinforcement, anchor rods Reinforcement, hanging net shotcrete reinforcement, cement soil mixing reinforcement and rotary spraying reinforcement, etc. This active reinforcement and support method is highly praised by people because it can effectively improve the strength of rock and soil itself and can greatly reduce the cost of support and reinforcement. However, due to the limited bonding force between the weak rock-soil mass and the anchor, only grouting, rotary grou...

AI Technical Summary

Problems solved by technology

However, due to the limited bonding force between the weak rock-soil mass and the anchor, only grouting, rotary grouting, stirring or anchoring have little effect on the strength and integrity of the weak rock-soil mass, and the enhancement speed is slow, and the enhancement effect Reasons such as difficulty in control often limit their application range, and generally can only be used as an auxiliary support and reinforcement measure. For example, this type of support method is often used as auxiliary support in the support of foundation pits and tunnels.

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