SU1467196A1 - Reinforced shotcreting-produced support for mine workings - Google Patents

Abstract

FIELD OF THE INVENTION The invention relates to mining and can be used to mount mine workings with a supple support. In order to improve the performance of the spray-concrete support, it is made supple. For this, the reinforcement mesh, which is fixed on the anchors and coated in a flexible material, is made in the form of dedicated webs. Cloths are prestressed and their edges are lapped. In the places of overlap of the canvases, the nodes of compliance are arranged, for which between the ends of the canvases is placed in composite material by the thickness of the layer of sprayed concrete that covers the entire grid. The grid on the anchors is hung in two layers. First, the edges of the webs are pressed to the rock, and then the bulge of the central part, thereby creating a prestress. The second layer of grids is hung in the intervals between the first. The maximum deformations are realized in the nodes of compliance, and the blocks of sprayed concrete remain rigid, leaving the load. Due to this, the load is equalized. 3 il. i SL

Description

one

The invention relates to mining and can be used to mount mountain treads.

Figure 1 shows the lining, a general view; Fig. 2 shows the stages of the erection of a cross; on fig.Z - the nature of the work lining.

The lining design (Fig. 1) consists of a pedigree contour 1, formed in array 2 fixed with lining, which is part of an array - lining system as a component. In array 2, holes 3 are drilled perpendicular to the surface of body 1, into which anchors 4 are inserted, pressing grids to the surface of contour 1 of the web

5 and 6, which are made of reinforcing elements 7, covered with anti-plastic material 8. Grid webs are laid and fixed on contour 1

in the stress-strain state with an overlap of 9 grids 6 on the webs of the grids 5 and with placement in places of overlap 9 in the plastic material 10. On top of the webs of the grids 5 and

6 covered with sprayed concrete 11.

The support is erected as follows (Fig. 2.

At the beginning, along the perimeter of production perpendicular to the surface of circuit 1 in array 2, drill hole 3, in which:

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Anchors 4 are installed. On the latter, webs of meshes 5 of the first layer are hung. The webs of the grids are weighed in such a way that they are first placed on the pedigree surface of circuit 1 with the brim clamped by the central convex part inside the excavation, after which the bulge is pressed on the pedigree surface 1 by giving the net tension to the net surface with a radial thrust 1 and the shape of the latter with a return radius from the initial length of the grids of the grids 5 with the grids of the grids 6 of the second layer are applied by sprinkling with a viscous plastic 10, for example, gypsum cement. After that, webs of the second-layer grids 6 are installed, placing them in the gaps between the meshes of the first layer 5, so that the meshes of the upper layer from the lower one are overlapped. The convexity of the meshes of the upper layer is pressed to the rock surface of the contour 1 and fixed on the anchors 4, Meshing of meshes is done by first spraying different layers of meshes into the plastic material 10 on the joints of the webs, followed by gaps between the areas with the applied plastic material. iruyuts sprayed concrete 11.

The support structure works in the following way

Initially, immediately after weighed and fixed the mesh in stress-strain STANDING; the grid elastically supports array 2, increasing the blockage of the array blocks by itself. In the course of such work, work is carried out on the creation of lining in full, Later, after the complete erection of the structure, the lining when one of the sides of the mine is deformed, which occurs when the mine is located asymmetrically

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the front of the cleaning operation, the maximum deformations are realized in the pliability nodes of plastic 10, the blocks 12 and 13 formed from rigid material such as splashing-concrete remain rigid, they leave from under the load of the deforming massif by angular rotation at the nodes of compliance. Load unevenness due to unequal displacement.: Points of pedigree contour 1 are aligned due to the possibility of zoplastic displacement of the webs in rigidly elastic blocks 12 and 13, such as the mesh elements are covered with visco-plastic material 10, excessive loads occurring in the net webs, they are redistributed into the nodes of compliance and are reduced due to the possibility of relative displacement of the nettings relative to each other in the visco-ductile material. Thus, the entire load from the deformation of the array is realized locally at the nodes without destroying blocks 12 and 13, which characterizes the stability of the structure and its performance under conditions of significant deformations of the breed contour.

Claims (1)

Invention Formula Reinforced splash-concrete lining of mine workings, including a layer of splashing concrete, reinforcing mesh j, attached to the anchors, is so that, in order to improve the performance of the lining by increasing its ductility, the reinforcing mesh along the working perimeter is made the form of separate pre-stressed and covered in zkoplasticheskoe material canvases, the edges of which are overlapped, at the same time in the places of overlap of canvases on the crowd (one more layer of sprayed concrete is additionally placed in the zkoplastichesky material. ///////////////////////////// (rig.1 FI.2       v .