SU775346A2 - Method of erecting isolation strips at mining of sloping coal beds - Google Patents

Description

The invention relates to the mining industry, in particular to methods for the safe mining of coal seams, and can be used when excavating steep coal seams with laying out the collapse and space. The method of insulation of insulating strips in the development of steep coal seams, according to the main author. St. 653413, includes the erection of the protective lining along the normal to the reservoir, the flooring and the flexible air coating of the impermeable material on the side of the lining, filling the backfilled space with the backfill material, the device of the second row of protective lining from the top of the strip of the backfill material they are fastened between one another by straps, for example cables € 1, which are preliminarily extended between rows of protective lining l. The disadvantage of this method of erecting insulating strips is the plunging of the racks of the upper row of the barrier, lining the filling mass in the process of shrinking both rows of the protective lining between them, because of the termination of the backfill array between adjacent racks are not affected compressive loads, therefore, the spreading of the bookmark with lateral rocks is reduced. And, consequently, the stability of the strip as a whole and the reliability of its operation. The purpose of the invention is to increase the stability of the insulation strip by increasing the spread of the insulation strip between the roof and the soil. This is achieved by the fact that before erecting a second row of protective lining, the flooring is laid on top of a strip of hardened material, and the beams of protective lining in adjacent strips are laid in a checkerboard pattern. FIG. 1 shows the insulation strip in the cross section of the formation; ya fig. 2 - insulation strip top view. An insulating strip according to the proposed method is erected in a mine working, passed through the reservoir to the full capacity in one or several stages (layers). FIG. 1 shows such a development, passed in two layers along a thick layer. First, remove the lower inclined layer (strip) 1 from the recumbent side of the reservoir at the thickness of the power. The cleaning space of the strip is fixed with a frame post support 2. The racks in the frames as they are erected by the filling mass are removed. After removal and fastening of the strip, under the lower row of frame posts, the supports 3 on the uprights 4 are installed. On the upstands 3, they are scattered along the normal to the nylon layer of the beams 5, which are

On top of the beams 5 arrange flooring b of boards, knurling, etc. A flexible coating 7 of an airtight material is laid on the flooring b. The beams 5 are connected, for example, with the help of clamps 8, sections of steel ropes 9, the free beds of which are passed through the floor 6 and the flexible covering 7 and 2 strips are suspended from the frame supports. After that, the strip is filled to a certain height with a filling material 10. Depending on the stability of the coal array, the strip can be laid out immediately for the entire length of the removed strip or as the strip is dredged.

After filling the backfill strip with material, before erecting a second row of protective lining, a floor 11 is placed on top of the backfill strip, which can be made of planks, knurls, metal mesh, etc.

FIG. 1 shows the floor 11 of the roll. Beams 1, which are the second row of barrier support, are laid out over the flooring along the normal to the bedding.

 After that, the same incision and fastening of the inclined strip (layer) 13 is carried out in the same direction to the side of the reservoir, laying the first row beams of the barrier support, flooring 6 and flexible covering 7, installing steel cables 9, filling the strip 13 with backfill material, laying the flooring 11 and 12 beams of the second p and protective lining. Beams 5 and 12 in adjacent strips are placed in a checkerboard pattern (see Fig. 2) so that when the lateral rocks approach, they do not move one relative to another without creating a spread. Then, the beams of both rows of the protective support are fastened with the help of tensioning devices, which ensure the initial

naying isolation strip with side rocks.

The proposed method ensures uniform distribution of compressive loads over the upper plane of the insulating strip, thereby increasing the lateral spread of the filling mass with lateral formation rocks, and, consequently, increases the stability and reliability of the insulating strip.

0 The use of the proposed method will reduce the costs of building an insulating strip and increase the safety of work.

Claims (1)

1. USSR author's certificate number 653473, cl. E 21 F 15/00, 1976. / // jt: f //: y // t // jf: fy / AfSy // P YU ffut.l // ffy // jf $ //,