Porous parallel-connected grouting method and device for reinforcing roadway weak surrounding rock

Abstract

The invention provides a porous parallel-connected grouting method and a device for reinforcing a roadway weak surrounding rock. Hole sites of grouting hole are arranged in a plum flower shape, and an electric grouting pump with a large flow (no less than 52L / min) and a grouting pipe with a large diameter are adopted to be connected with 3-9 grouting pipelines through a multi-level shunt controller; a pressure gauge, a control valve and a flowmeter are all installed on each grouting pipeline so as to be used for controlling the pressure and the flow of the grouting holes in real time; the same position with similar development degree of damage and a crack on a bottom plate, a side part or a top plate in a certain region of a roadway is selected to punch with a plurality of grouting holes,and grouting anchors are installed; and a plurality of grouting anchors are connected through a plurality of grouting pipelines so as to realize simultaneously grouting on the plurality of grouting holes. When slurry in one hole does not flow any longer, and the grouting pressure achieves above 2MPa, grouting of the grouting hole is stopped, the grouting pipeline is connected to the next groutinganchor so as to implement grouting of the next grouting hole until the grouting holes in the region are all grouted. The grouting speed is enhanced by above 3-9 times, thereby greatly enhancing the self bearing ability of the surrounding rock.

Description

technical field [0001] The invention relates to a porous grouting method and device, in particular to a porous parallel grouting method and device suitable for reinforcement of weak surrounding rocks of roadways, and belongs to the field of support engineering of weak and broken surrounding rocks of roadways. Background technique [0002] The soft surrounding rock grouting technology has been applied to a certain extent in the field of coal mine roadway support at home and abroad in recent years. , improve the support effect, and can also play the role of water blocking and anti-seepage in the roadway with a large amount of water inflow. However, the existing grouting technology in coal mines has the following problems: (1) The grouting hole adopts a single rectangular arrangement, and the grout first penetrates into the relatively developed cracks, preventing the reinforcement of low permeability argillaceous soft rocks; The single-hole construction of the slurry pump has ...

AI Technical Summary

Problems solved by technology

However, the existing grouting technology in coal mines has the following problems: ①The grouting holes are arranged in a single rectangle, and the grout first penetrates into relatively developed cracks, which prevents the reinforcement of low-permeability muddy soft rock; ②Using low-flow grouting The single-hole construction of the grout pump is slow and inefficient, and has become the bottleneck of the rapid excavation of the roadway; ③ Due to the lack of control methods for the grouting process, the operation often results in lack of grouting and missing grouting, which cannot meet the grouting quality requirements; ④Some In order to meet the progress requirements, the mine arranges a large number of personnel and equipment to work at the same time, resulting in the occupation of personnel and equipment, and has a great impact on the normal excavation construction

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