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Method for soft rock roadway grouting and full-length prestress baseboard anchor cable comprehensive support

A prestressed bottom plate and anchor cable technology, which is applied in the direction of earth drilling, bolt installation, mining equipment, etc., can solve the problems of small bolt length, low anchoring force and cannot be effectively controlled, and achieve the effect of controlling the deformation of the roadway bottom plate

Active Publication Date: 2013-06-19
HEBEI TONGCHENG MINING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to overcome the existing method of adding concrete with metal anti-arching, the length of the anchor rod is small, the anchoring force is low, and the bottom sag cannot be effectively controlled. However, it is provided to drill holes on the bottom plate with a bottom plate anchor cable drilling rig, and use a pneumatic double-fluid grouting pump and Bo Lei’s chemical reinforcement material to grout the anchor cable on the bottom plate, which can ensure a high quality over the entire length. A comprehensive support method of soft rock roadway grouting and full-length prestressed floor anchor cables that can realize active support of broken rock formations by prestressed cables and effectively control the deformation of the roadway floor

Method used

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  • Method for soft rock roadway grouting and full-length prestress baseboard anchor cable comprehensive support
  • Method for soft rock roadway grouting and full-length prestress baseboard anchor cable comprehensive support
  • Method for soft rock roadway grouting and full-length prestress baseboard anchor cable comprehensive support

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Experimental program
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Embodiment Construction

[0021] b. Install the combined anchor cable 2 in the borehole 1;

[0022] c. Put the grouting pipe at the bottom of the borehole 1 equipped with the combined anchor cable 2, and inject a certain amount of chemical reinforcement grout waveline with a pneumatic double-fluid grouting pump;

[0023] d. Set up hemp rope or braided fabric at a distance from the hole 1 to block the slurry when the hole is to be sealed;

[0024] e. When the Bolein slurry is completely solidified, install the tray 3 and the lock 4, and perform initial tension on the combined anchor cable 2. A certain gap should be reserved before installing the tray 3, so as to facilitate the operation of hole sealing and grouting in the subsequent process ;

[0025] f. Then lower the grouting pipe into the borehole 1, and set the lower opening of the grouting pipe on the middle part of the borehole 1, on the hemp rope or braid, and seal the hole of the borehole 1;

[0026] g. Use the pneumatic double-fluid grouting ...

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Abstract

The invention provides a method for soft rock roadway grouting and full-length prestress baseboard anchor cable comprehensive support. The method comprises the following steps: fixing one end of a prestress anchor cable in deep surrounding rock at a roadway baseboard by a grouting method; initially stretching so that the stretched anchor cable has a certain prestress; drilling and then carrying out high-pressure grouting within a full-length range; and after slurry is solidified, stretching the combined anchor cable once again into a design anchoring strength. The construction method can ensure the anchor cable has higher prestress within the full-length range, achieve active support of the anchor cable on a broken rock stratum, and effectively control deformation of the roadway baseboard.

Description

technical field [0001] The invention relates to a soft rock roadway support method, in particular to a soft rock roadway grouting and full-length prestressed floor anchor cable comprehensive support method. Background technique [0002] The safe and reliable support of coal mine underground roadway is the basis for ensuring the normal production of the mine. The roof of the soft rock roadway and the support of the two sides, but the problem of the bottom has not been well resolved so far. At present, there is a general lack of support and strengthening treatment for the floor of various soft rock roadways in China. In addition, the long-term effect of water accumulation in the roadway will soften the floor rock to a greater degree, making the roadway floor one of the weak links of the entire roadway support system. Practice It tells us that the convergence deformation of the roadway in the mining area is mainly caused by the bottom sag, and the bottom sag often accounts for...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D20/00E21D21/00
Inventor 宋彦波
Owner HEBEI TONGCHENG MINING TECH
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