SU1221366A1 - Mine working roof support - Google Patents

Description

one

The invention relates to the mining industry, in particular to the fastening of mine workings with tubing support.

The aim of the invention is to increase the bearing capacity of the support.

FIG. 1 shows the lining, profile cut; in fig. 2 is a section A-A in FIG. one; in fig. 3 — node 1 in FIG. 1 (compound rings and casings).

Mining support consists of outer 1 and 2 inner shells concentrically mounted with a gap. The gap 3 between the shells is filled with a material that expands during hardening, for example, concrete on the spraying cement.

The outer 1 and inner 2 shells consist of tubings with dome-shaped walls 4, 5 facing towards the rock massif and 5 radial towards the development side shelves 6, 7. In this case, the dome-shaped surface of the walls is described by the paraboloid equation

y () () - | g,

where x, y, z are the coordinates of the points on the surface of the wall; a, b - half the size of tubing in the plan;

f - dome lifting arm, corresponding to. Such an equation is derived from the rectangularity of tubing in a plan with dimensions of 2 d and 2B.

In accordance with the formula at a and, i.e. by perimeter of tubing,, with, i.e. in the center of tubing, (dome lifting arm)

The outer shells 1 are connected in height by means of the shelves 6 and the bolted link 8. The inner shells are connected in height by the shelves 7 and the bolted link 9. In addition, the outer 1 and inner 2 shells are interconnected by means of the shelves 6, 7 and the bolted links 8, 9 with the possibility of adjusting their relative position in the radial direction.

3662

In this case, the shelves 6 of the outer shells 1 have radially extended apertures 10 for fixing the inner shells 2 in the desired position. This achieves the regulation of the support capacity of the lining. The size of the shelves 6 corresponds to the placement on them with a gap of 3 shelves 7 of the inner shell.

For better adhesion of concrete to the walls of tubings and to provide a beam. The joint work of the outer and inner shells of the wall of tubing on the side of contact with concrete is grooved.

The lining is erected as follows.

First, construct the outer part of the lining. The outer shells 1 are constructed from dome-shaped tubing 4. They are joined in height by means of shelves 6 and bolted connection 8. After the external lining has been built, including the stamping of the seams, cement mortar is forced through the holes in the walls of the tubing (not shown). This lining can serve as temporary lining. The construction of a complete support structure may lag behind the penetration.

Inner shells are constructed similarly from tubing. In height, they are joined by shelves 7, placed on shelves 6, outer shells and bolted connections 9, passing through holes in shelves 7 and radially stretched holes 10 in shelves 6.

After the construction of the inner part of the lining, including the embossing of the seams, the gaps between the shells are filled with concrete mixture on the stressed cement. The filling is done through holes in the walls of the inner shells (not shown).

The bearing capacity of the support is enhanced by the fact that the tubing is dome-shaped, so that the structure becomes a spacer. Each tubing in cross section works in compression, which greatly increases its carrying capacity.

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Claims (4)

MOUNTING MOUNTING FASTENING, which includes concentrically installed outer and inner tubing shells, the walls of which are connected by shelves in length, and the gap between the shells is filled with filler, characterized in that, in order to increase the load-bearing capacity of the supports, the walls of each tubing are domed with a bulge towards the rock mass moreover, the shelves of the outer shells are made more than the shelves of the inner shells by the size of the gap between them in the middle part of the tubing and are interconnected, and the filler in made of expanding material during hardening. 2. Fix the pop. 1, characterized in that the filler is made of concrete on prestressed cement. 3. Hold on PP. 1 and 2, characterized in that the tubing walls on the contact side with concrete are corrugated. 4. Hold on PP. 1 - 3, characterized in that the domed surface of the walls have a shape *! mu paraboloid, according to the equation y = (x ² -a ² ) (z ² -b ² ) - ~ _r , where x, y, z are the coordinates of the points on the wall surface, m; a, b - half, respectively, I length and height of tubing, m; f - boom of lifting the dome, m bie bie Sae 1 122