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

A technology of prestressed bottom plate and anchor cable, which is used in earth-moving 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 roadway bottom plate

Active Publication Date: 2010-10-27
HEBEI TONGCHENG MINING TECH
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to overcome the drawbacks of the existing method of adding concrete with metal anti-arching, the short length of the anchor rod, and the low anchoring force that cannot effectively control the bottom sag, and provide a bottom plate anchor cable drilling rig to drill holes on the bottom plate, The anchor cable grouting on the bottom plate with the pneumatic double-fluid grouting pump and the Polein chemical reinforcement material can ensure a high prestress in the whole length range, and can realize the active support of the anchor cable to the broken rock formation, A comprehensive support method of soft rock roadway grouting and full-length prestressed floor anchor cables to 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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Embodiment Construction

[0019] refer to Figure 1~3 The method for comprehensive support of soft rock roadway grouting and full-length prestressed floor anchor cables provided by the embodiment of the present invention can be carried out through the following eight steps:

[0020] a. First, use the floor anchor cable drilling rig to drill hole 1 on the floor of the roadway. The depth of drill hole 1 is designed and determined according to the geological conditions of the floor, and the deepest is 20 meters;

[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 a hemp rope / braid at a distance from the hole 1 to the bottom to block the slurry when the hole is to be sealed;

[0024] e. When the Bolein slurry is completely solidified, install the tray 3 a...

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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 Applications(China)
IPC IPC(8): E21D20/00E21D21/00
Inventor 宋彦波
Owner HEBEI TONGCHENG MINING TECH
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