RU2505678C1 - Cable roof bolting of high load-bearing capacity - Google Patents

Abstract

FIELD: mining.

SUBSTANCE: there proposed is an anchoring rod that consists of three cables, each of which in its turn consists of several strands twisted between themselves. Note that inside the rod along its whole length between the cables there are mounted bracings, above which there fixed are the bands pressing the cables to the bracings. At the bottom-hole end of the anchor rod there made is an expansion unit. At the tail end of the anchor there is a shank with three holes of cylindrical shape becoming conical at the bottom, in which there attached are the cables in cutting wedges manner, and at the external surface of the shank there is a thread for tension nut. There is a binding mixture supply tube passing through the shank centre, and at the shank top there is a supporting washer. The supporting washer has a side hole, through which there supplied is a sealer and air discharge tube goes out; the air discharge tube also goes between two cables of anchor rod up to its top part. Between the tension nut and supporting washer there is an insert of semi-spherical shape without internal thread.

EFFECT: increase of stability and safety of mine workings fixing.

3 dwg

Description

The invention relates to the mining industry, in particular to anchoring the deep mine workings and can be used when securing the workings contour when the required length of the anchor exceeds the working height.

Known cable anchor for attaching mine workings (RF patent for the invention No. 2360122), including an anchor rod made of a rope, at one end of which there is a lock, and at the other end - a shank with a sealant pipe, a sealing element from elastic rings, an air exhaust pipe.

The disadvantage of this cable anchor is the insufficient bearing capacity due to the weak strength of the connection between the load-bearing rod and the liner, as well as the possibility of occurrence of air-filled cavities in the well when filling it with a fastening mixture, which leads to weak fixing of the anchor rod in the well.

The technical result of the invention is to increase the reliability and safety of fastening of mine workings, as well as to increase the economic effect due to the improvement of the bearing capacity of the anchor support and the possibility of installing it in difficult conditions.

The specified technical result is achieved by the fact that the anchor rod consists of three ropes, each of which, in turn, consists of several strands twisted together, while inside the rod along the entire length between the ropes there are struts over which clamps are attached, pressing ropes to spacers, the lock on the bottom of the anchor rod is wedge-shaped, in addition, the shank is made with three cylindrical holes that go down to the conical, in which the canal is mounted with split wedges ata, and on the outer surface of the shank there is a thread for the tension nut, in addition, a tube for supplying a fastening mixture passes through the center of the shank, and a support washer is located in the upper part of the shank, the diameter of which is larger than the diameter of the wellhead, a side hole is made in the support washer, through which is supplied by the sealant and the tube for air exhaust comes out, passing also between the ropes of the anchor rod to its upper part, a hemispherical spacer with a hemispherical shape is located between the tension nut and the support washer internal thread. The invention is illustrated in the drawing, where figure 1 shows its side view.

In the figure 1, the positions indicated:

1. Anchor rod

2. Wedge lock

3. Shank

4. Ropes

5. Slotted wedge

6. Support washer

7. Hemispherical spacer

8. Tension nut

9. The supply pipe fastening mixture

10. Side hole

11. Air exhaust pipe

12. Sealing composition

13. Spacers

14. Clamps

15. Cover

16. Fastener connection

17. Lattice tightening

Anchor rod 1 consists of three ropes 4, each of which consists of several strands twisted together. A wedge lock 2 is installed on the bottom part of the anchor rod 1. On the tail part of the anchor rod 1 there is a shank 3 with three holes that have a cylindrical shape that transforms into a conical, ropes 4 are inserted into these holes, each of which is fixed with slotted wedges 5. In the process of manufacture, ropes 4 with wedges 5 are pressed in the shank 3 by force movement along the axial holes, while the strands of ropes 4 are pressed by split wedges 5 to the walls of the holes of the shank 3. On the outer surface The shank 3 has a thread, thanks to which a tension nut 8 is attached to it, pressing the hemispherical spacer 7 to the support washer 6. The lower part of the shank 3 is closed by a cover 15 connected to the supply of the fastening mixture supply 16. The supply pipe of the fastening mixture 9 passes through the center of the shank. reaching the top of the anchor rod 1. In the support washer 6 there is a side hole 10 through which an air exhaust pipe 11 is passed, through which air from the well is discharged into the production. Through the same hole 10, a sealant 12 is supplied to seal the wellhead. Inside the anchor rod 1 along its longitudinal axis between the ropes 4, struts 13 are installed, and clamps 14 are fixed above them, which tightly press the ropes 4 to the struts 13, as a result of which the ropes 4 can work as a whole.

Installation and operation of the invention is as follows.

The anchor cable anchor of high bearing capacity is installed assembled in a drilled well. An anchor rod 1 is inserted into the well, a wedge-lock 2 is fastened to the wall of the well at its bottom. By rotating the tension nut 8, the hemispherical spacer 7 presses the support washer 6 through the lattice tightener 17 to the roof of the mine, creating a force of up to 8 tons. The shape of the hemispherical spacer 7 allows you to reliably fix the anchor support when the hole is located with a deviation from the perpendicular to the surface of the supported array. An injection unit is connected to the supply pipe of the fastening mixture 16, which through the supply pipe of the fastening mixture 9 pressurizes the fastening mixture into the well. The fastening mixture rises from the wellhead to its bottom, displacing air through the air exhaust pipe 11, filling the entire space of the well and not leaving air-filled cavities. The fastening mixture is pumped into the well until it starts to escape through the air exhaust pipe 11. To prevent leakage of the fastening composition, the wellhead is filled with a sealing compound 12. After the polymer mixture has cured, the anchor rod 1 takes up the load and allows it to withstand tensile stresses in the fastened an array.

Constructive solutions of the invention can increase the bearing capacity of the cable anchor. The tensile strength of the wire rod of such an anchor can be more than 500 kN. The estimated length of the anchor lining up to 11 m allows you to securely fix it outside the contour of weakly stable rocks.

The presence of a mechanical key lock at the end of the anchor allows you to quickly, conveniently and reliably fix it at the required depth. The design of the claimed invention provides for the possibility immediately after installation in the well to create a working load on the anchor rod of at least 80 kN and fix the anchor rod in the well over its entire length, for example, with chemical resins or cement composition.

The proposed design of the anchor lining opens up the possibility of its use in particularly complex and specific mining and geological and mining conditions for fastening and maintaining mine workings, pairing, mounting chambers, etc., and also increases the economic effect of working the mine, reducing the cost of fixing the mine and increasing the speed of penetration.

Claims (1)

Anchor rope support of high bearing capacity, consisting of an anchor rod made of a rope, on the bottom part of which there is a lock, and on the tail part - a shank in which the strands of the rope are fixed, as well as an air exhaust pipe, characterized in that the anchor rod consists of three ropes, each of which, in turn, consists of several strands twisted together, while struts are installed inside the rod along its entire length between the ropes, over which clamps are attached, pressing the ropes to spacers, the lock on the bottom of the anchor rod is made wedge-shaped, in addition, the shank is made with three cylindrical holes that go down to the conical, in which ropes are attached with split wedges, and on the outer surface of the shank there is a thread for the tension nut, in addition, through the center the shank passes a pipe for supplying a fastening mixture, and in the upper part of the shank there is a support washer, the diameter of which is larger than the diameter of the wellhead, a side hole is made in the support washer, through A sealant is supplied and an air exhaust pipe comes out, passing also between the ropes of the anchor rod to its upper part, a hemispherical spacer without internal thread is located between the tension nut and the support washer.

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