Gob-side entry retaining reinforcing filling body structure and construction method thereof

Abstract

The invention relates to a gob-side entry retaining reinforcing filling body structure and a construction method thereof. The method comprises the following steps of: making a filling bag into an enclosed oblong-shaped structure and sewing a plurality of small bags at the top edge of the filling bag and at the same position on two side faces along the filling direction, wherein the top small bag is used for filling feedstock and exhausting and a cross anchor is inserted into small bags on the side face for reinforcing a filling body and protecting sides; sewing hooks with certain densities inthe top central area of the filling bag and four side face lines which are certain distances away from the top of the filling bag, hanging the hooks on a top plate or four sides of a filling space, molding the filling body by using a reinforcement mesh and taking the reinforcement mesh as a reinforcing filling body for the cross anchor; before filling, inserting the cross anchor into the small bags on the side face, binding the small bags with a steel wire, putting a tray in place and screwing a screw cap; and during filling, plumping the filling bag until the filling bag is close to the roofby using the grout outlet pressure of a filling pump and enhancing anchor anchorage force to a preset value after the filling body reaches certain intensity so as to further realize the filling and reinforcing of the filling body. The structure is simple and is convenient to construct.

Description

technical field [0001] The invention relates to the technical field of underground mechanized construction of roadside filling bodies, in particular to a reinforcement filling body suitable for gob-side entry retention in deep high-stress mines and a construction method thereof. Background technique [0002] Gobside retention is to use a roadway twice, which greatly improves the resource recovery rate and relieves the tension of mining replacement. It is a major reform of coal mining and mining roadway layout technology. After entering deep mining, the mine pressure intensifies, the roadway diameter shrinks significantly, large deformation of gob-side retaining filling body occurs, and bearing failure increases, especially the unroofed filling body damage is more serious. Therefore, the filling and roof connection effect and filling body support are the key points in gob-side entry retention. The usual method of mechanized filling in the past is: 1. First, secure the single...

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Problems solved by technology

[0003] The shortcomings of using this method or the points that need to be improved are: 1. Due to the complex conditions of the roof of the underground working face, after the mining of the working face, the roof is uneven (or tilted or tilted), caving and net pockets are more common, and the open method is adopted. The top-connecting effect is poor when filling bags of the traditional type, and often only a small part of the filling body can be connected to the top, and it is necessary to wait for the filling body to solidify and place a wooden pile on its top to connect the top. On the one hand, raw materials such as wood are wasted; on the other hand, it makes Under the action of mine pressure, the roof of the roadway retaining slowly contacts the filling body, so that the peak value of the bearing pressure on the side of the coal side is transferred to the deep part of the coal seam, which cannot give full play to the early strength characteristics of the filling material, and may easily cause the failure of the roadway retaining along the gob; 2. Filling and reinforcement filling The body is implemented in two steps, and the process is cumbersome. Can the anchor rod be implanted in advance according to the requirements of the reinforced filling body during filling, and the anchor bolt should be tightened to the preset value after the filling body reaches a certain strength, which reduces the need for erection, Processes such as dismantling the formwork, hanging the net, drilling and installing anchor rods, etc., realize filling and strengthening the filling body in one step

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