High-water material filling device suitable for gob-side entry retaining and method of device

Abstract

The invention discloses a high-water material filling device suitable for gob-side entry retaining and a method of the device. The method comprises the steps that a row of front hydraulic supports and a row of rear hydraulic supports are arranged on each of the two sides of a roadway in the advancing direction of a working face in a one-to-one correspondence mode, and then the front hydraulic supports and the rear hydraulic supports are each provided with a combined filling plate; filling bags are hung on all the combined filling plates and penetrate through oppositely-pulled anchor rods, then grouting is conducted in the filling bags, and in the grouting process, after a front top beam retracts, the filling bags are made to gradually get close to a roadway roof along with continuous injection of grout till roof contact is completed; when the strength of a grout body in the bags reaches 4 MPa after roof contact, the filling operation of the position is completed; and then the combined filling plates are adjusted, the front hydraulic supports and the rear hydraulic supports are driven to move forwards along the roadway, after support moving work is completed, the filling grouting process is repeated again, and filling operation at the position is conducted. Operation is simple, the high-water material can be filled in gob-side entry retaining safely, efficiently and continuously, and therefore, continuous and stable coal mining is ensured.

Description

technical field [0001] The invention relates to a high-water material filling device and method suitable for gob-side entry retention, and belongs to the technical field of coal mine safety mining. Background technique [0002] Gobside entry retaining technology has been widely used in recent years to cancel section coal pillars and improve the recovery rate of coal resources. In the existing technology, high-water materials have the advantages of large support resistance, fast resistance increase speed, moderate shrinkage, good roadway maintenance effect, simple filling process and filling equipment, and have been used in some mining areas. However, high-water materials are first injected into the filling bag in liquid form, and then solidified to form, so a support form is required to provide support for its filling and forming. The current main formwork support process is: pillars - vertical steel mesh - hanging filling bags - piercing the anchor rods and fixing the ladd...

AI Technical Summary

Problems solved by technology

[0003] The above processes are all manual operations, which are time-consuming and inefficient

Among them, the steel mesh has poor anti-deformation ability, which cannot ensure that the tension anchors are in a straight line, and cannot give full play to the anchoring effect of the anchors; it needs to be trimmed according to the top and bottom plates and cannot be recycled

In addition, the single hydraulic prop is heavy and has poor stability. When the surrounding rock conditions of the roadway are poor, there will be bulges on the top and bottom plates, which will cause the filling bag to not be fully hung or not connected to the top after hanging, thereby affecting the quality of support. Roof collapse occurs when the column and the column in the empty area are returned

And the filling support currently used, because the top beam blocks the filling body from connecting to the top, resulting in the separation of the roof and increasing the maintenance cost of the roadway

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