RU1810561C - Yielding support of development workings - Google Patents

Abstract

Usage: the invention relates to mining and is intended for fastening preparatory mine workings in order to maintain them. Essence: the compensation cavity created in the bottom of the rack allows, when dismantling the lining, to redistribute the flexible filler under pressure in the main cavity into it. As a result, the compressive stress on the roof support structures is removed, it is removed and can be reused. 3 ill.

Description

The invention relates to mining, and in particular, to securing and maintaining preparatory mine workings.

The aim of the invention is to provide multiple use of the lining and reduce the cost of maintaining mine workings.

In FIG. 1 is a longitudinal sectional view of a roof support assembly, where the compensation cavity and the liner therein are shown from the end; in FIG. 2 - the same, in a perpendicular longitudinal section; in FIG. 3 is an orthogonal projection of an insert on an enlarged scale.

The device comprises an upper one 1, resting on racks, each of which consists of an upper block 2 included in the lower block 3. Between said blocks 2 and 3, a cavity 4, varying in volume, is formed, filled with a compliant material 5.

At the base of the lower block 3, a through compensation cavity 6 is made, its upper boundary connecting with the bottom surface of the cavity 4. In the compensation cavity 6 there is an insert 7, its height is less than the height of the cavity 6, fixed in the gap between the lower surface of the insert 7 and the bottom of the cavity 6 by the wedge 8. The insert 7 has sections of 9 lateral faces coinciding with the reciprocal angle with the inner surface of the protrusions 10 of the bottom of the block 3.

The assembly of the lining is as follows.

An insert 7 is inserted into the through compensation cavity 6 from the side surface of the lower block 3. In this case, with the cuts 9 of its side faces, it abuts against the inner surfaces of the protrusions 10, which keep the insert 7 from entering the cavity 4. At that, its face 11 is at the bottom level eaten surface C

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4. To keep the insert 7 in this position, a wedge 8 is inserted under the bottom face 1.2 and the bottom surface of the cavity 6 into the free space.

The cavity 4 is filled in the required volume with a compliant material 5, which can be used clay with a given moisture content and with the addition of solid fractions, or another similar plastic material.

Next, the upper block 2 is inserted into the lower block 3 on top of the compliant filler 5. Thus, the lining stand is assembled. On two racks “.” Mounted along the sides of the excavation, the upper one is fixed from above.

The lining works as follows.

When mountain pressure develops, the roof of the mine settles, presses on the top to 1 lining. Upper 1 pressure is transmitted to the upper block 2. The latter, in turn, exerts pressure on the compliant material 5, compressing it between the lower end of the block 2 and the bottom surface of the cavity 4 of the lower block 3. In this case, part of the specified bottom surface is the upper face 11 of the insert 7. Therefore, the pressure of the compressible flexible material 5 is transmitted to this face 11, the insert 7 as a whole, and to the wedge 8 holding the insert 7 in the assembly position,

At the end of the operation of the mine, when it is paid off, the lining is dismantled in compliance with the necessary safety rules.

Dismantling is carried out as follows.

A wedge 8 is selected in each of the racks of the fastening frame, holding the insert 7 in the assembly position and serving as a support for the insert 7. In this case, free space is formed under the lower face 12 of the insert 7. Under the force of its own gravity, as well as under the pressure exerted on it by the compressed flexible material 5, the liner 7 is lowered to the bottom surface of the compensation cavity 6. The liner 7 released in this way from fixing is taken out, and compliant material begins to flow into the released compensation cavity b. 5. experiencing the compressive pressure of block 2. Since the area of the hole in the bottom of block 3 is equal to the width of the edge 11 of the insert 7, and the length is the distance between the inner walls of the cavity 4 of block 2, Since the volume of cavity 4 is small (it can be changed in the manufacture of blocks), the flow of ductile plastic material 4 proceeds smoothly. The resistance of the compliant material 5 to the compressive force exerted by the block 2 during this period decreases and the block 2 sits smoothly. At the same time, the upper one 1 gradually drops together with the block 2.

As a result, the mounting frame is freed from the pressure of the roof for a time sufficient to remove it,

Thus, the support of the proposed design, unlike the prototype, can be reused, and the cost of maintaining the mine workings is significantly reduced.

The support of this design was tested in the experimental workshop and its pilot industrial implementation is planned at the Western Karazal mine in 1991-1992,

Claims (1)

SUMMARY OF THE INVENTION Supports support for preparatory workings, comprising upper and lower blocks, one of which enters the other, as well as a cavity between them, filled with compliant material, characterized in that, in order to ensure repeated use of the support and reduce the cost of maintaining the workings, in the bottom of the lower block, a compensation cavity is made in which the insert and the wedge are installed, moreover, protrusions with beveled faces are formed on the bottom of the cavity from the outside, and on the side faces of the insert The sections are cut at an angle corresponding to the angle inside the faces of the protrusions.