A high-water material filling device and method suitable for gob-side entry retention

Abstract

The invention discloses a high-water material filling device and method suitable for retaining roadways along gobs. A row of front hydraulic supports and rear hydraulic supports are respectively arranged on both sides of the roadway along the advancing direction of the working face and correspond to each other, and then each front Both the hydraulic support and the rear hydraulic support are equipped with combined filling plates. Hang the filling bags on each combined filling plate and pass through the anchor rods, and then inject grout into the filling bags. After the front top beam retracts during the grouting process Make the filling bag gradually approach the roadway roof with the continuous injection of slurry until the roof is connected; when the slurry in the bag reaches 4MPa strength after the roof is connected, the filling operation at this position is completed; then adjust the combined filling plate and drive the front hydraulic support and The rear hydraulic support moves forward along the roadway. After completing the work of moving the frame, repeat the above filling and grouting process again to carry out the filling operation at this position; the operation is simple, and it can realize safe, efficient and continuous high The filling operation of water materials, so as to ensure the continuous stability of coal mining.

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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