Variable-diameter multi-direction anchor pile

A variable-diameter, weak technology, applied in sheet pile walls, buildings, foundation structure engineering, etc., can solve the problems of weak rock and soil strength and integrity improvement, difficult to control the enhancement effect, and limited application range, etc. Achieve the effect of wide applicability, convenient construction and shortened construction period

Inactive Publication Date: 2010-02-17
SHANGHAI STRONG FOUND ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 ef...

Method used

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  • Variable-diameter multi-direction anchor pile

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0016] (1) Forming method of variable-diameter oblique piles with rapid anchorage of rock and soil

[0017] (1) Determine the drilling method according to the direction required by the design (horizontal, oblique or vertical);

[0018] (2) Breaking soft rock and soil by means of rotary cutting;

[0019] (3) The gel is injected through the drill pipe, and the gel can be: cement slurry, lime slurry, chemical gelling agent, cement mortar, etc.;

[0020] (4) Inject the gelled slurry through the nozzle on the drill bit;

[0021] (5) Inject while stirring;

[0022] (6) Change the injection pressure and the rotation speed and reciprocating time of the drill bit;

[0023] (7) The drill bit reciprocates until it reaches the designed pile length and pile diameter;

[0024] (2) Forming method of variable diameter anchor pile

[0025] By changing the injection pressure, the diameter of the injection port, the speed of rotation, advancement, and retreat, and the injection process, the...

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PUM

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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...

Claims

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Application Information

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IPC IPC(8): E02D5/54E02D5/48E02D5/36E02D5/74
Inventor 刘全林宋伟民
Owner SHANGHAI STRONG FOUND ENG
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