RU2498075C1 - Method to install blast expansion anchor - Google Patents

Abstract

FIELD: mining.

SUBSTANCE: blast expansion anchor is inserted into a well head by serially connected sections of pipes and arranged on the section of potential caving of side rocks. A section of a detonating cord with a detonating cap of instant action is inserted into the cavity of the blast expansion anchor, a drilling head is installed. Then the section of the well between its head and the drilling head is filled with an explosive, installing a detonating cap of moderate action. The section of the detonating cord is exploded 1-2 seconds ahead of explosion of the explosive.

EFFECT: increased stability of underground mines due to increased thickness of rock layers fixed by blast expansion anchors of increased length and installed ahead of explosion of a well charge.

3 cl, 7 dwg

Description

The claimed invention relates to the mining industry and can be used in underground mining of mineral deposits in rocks of medium and lower average stability, except for mines hazardous in gas and dust, for example, coal.

The claimed invention relates to a priority area for the development of science and technology "Technology of environmental safety of mining and mining", because it solves one of the problems associated with the stability of rocks.

A known method of installing an explosion-proof anchor, including attaching a detonating cord to the first pipe segment, installing a pipe segment at the wellhead, passing the detonating cord through a second pipe segment of a smaller diameter, which is inserted into the first pipe segment and installed at the wellhead, forming an explosion-proof anchor from these pipe segments, and detonating cord blasting [Copyright certificate, for the invention of the USSR, No. 1620640, cl. E21D 21/00, published 1/15/1991, Bulletin of inventions No. 2].

A common feature of the known method of installing explosive anchor with the claimed invention are:

- execution of explosive anchor from pipe segments;

- installation of an explosive expansion anchor into the well, the length of which exceeds the cross-sectional dimensions of the underground mine working.

The disadvantages of the known anchor support for attaching mine workings are:

- the implementation of explosive anchor from pipe segments of different diameters significantly complicates its movement through the well due to irregularities in the walls of the well and its curvature formed during drilling.

- the presence of a detonating cord inside the explosive anchor when moving along the well by known methods creates the danger of premature detonating cord detonation;

- the method of installing an explosive expansion anchor at the wellhead eliminates the possibility of advancing fastening of sections of lateral rocks at a distance of 3-5 m or more from the bottom.

The prototype adopted a method of installing an explosive expansion anchor as the closest in technical essence and the functions it performs to the claimed invention, including drilling a well from a mine, placing a pipe section in it, introducing a detonating cord installed on the holding rod, filling the pipe section with water, installing a plug to hold the water column and detonating the detonating cord. Water in the hole is necessary to neutralize the explosion flame in mines, dangerous for gas and dust [Shirokov A.P. and others. Anchor support. Directory. M, Nedra, 1990, 206 s, p. 40, Fig. 3.2.y.]

Common signs of a known method of installing an explosive anchor with the claimed invention are:

- drilling a well from a mine;

- placement of a pipe section in the well;

- the introduction of a detonating cord into a pipe segment;

- detonating cord detonation.

The disadvantages of the known method of installing explosive anchor are:

- the impossibility of installing an explosive expansion anchor into the well, the length of which exceeds the dimensions of the cross section of the mine;

- the impossibility of placing inside a pipe section installed in a well longer than the cross-sectional size of an underground mine working, a detonating cord due to complications when introducing a holding rod with a significant length along the pipe section;

- the danger of installing a detonating cord in a pipe segment using a holding rod due to the friction of the detonating cord against the inner walls of the pipe segment;

- the difficulty of installing a pipe segment in the well as a result of significant resistance at its end when moving the pipe segment along a curved well with uneven walls;

- reducing the adhesion of a pipe of considerable length to the walls of the hole due to the "local indentation" of the pipe into the walls of the well as a result of the impossibility of introducing into the hole a retaining rod with a length exceeding the dimensions of the cross section of the underground mine;

- the known method eliminates the advanced installation of explosive anchor relative to the explosion of the borehole charge.

The causes of the disadvantages of the known method of installing explosive anchor are:

- the lack of a method for installing an explosive expansion anchor into a well from an underground mine, the cross-sectional dimension of which is less than the length of the well;

- lack of technical solutions for connecting pipe segments without increasing its external and reducing its internal diameters;

- the difficulty of installing the detonating cord in the cavity of the explosive expansion anchor, the length of which exceeds the size of the mine in its cross section;

- the absence of techniques that increase the safety of movement of the detonating cord inside the explosion-proof anchor;

- the absence of methods that reduce resistance to movement at the end of an explosive tube anchor when moving it along a curved well while drilling;

- the lack of a technical solution to increase the adhesion of an explosive tube anchor with a length exceeding the size of the mine working in its cross section with the walls of the well;

- the lack of a method for installing an explosive expansion anchor in a well for securing a section of rock at a distance of 3-5 m from its mouth or more when explosives charge an explosive in a well.

Improving the stability of underground mine workings by increasing the thickness of the rock to be bonded with explosive anchors is constrained by the disadvantages of using explosive anchors. An explosive expansion anchor cannot be installed in a well if the length of the explosive expansion anchor exceeds the cross-sectional dimensions of the underground mine. There is no way to advanced installation of explosive expansion anchor in the well relative to the explosion of the borehole explosive charge.

Thus, the problem of increasing the stability of underground mine workings by increasing the thickness of the bonded rock layer by explosive anchors consists in introducing an explosive anchor at the wellhead drilled from an underground mine, the cross section of which is smaller than the length of the explosive anchor, and in the advanced installation of the explosive anchor in the well relative to the explosion of the borehole explosive charge.

The invention is aimed at solving the problem of increasing the stability of underground mine workings by increasing the thickness of the rock layer fastened by explosive expansion anchors as a result of the introduction of an explosive anchor at the wellhead drilled from an underground mine, the cross section of which is smaller than the length of the explosive anchor, and in the leading the installation of explosive anchor in the well relative to the explosion of the borehole explosive charge.

The technical result of the claimed invention is to increase the stability of underground mine workings by increasing the thickness of the rock layer fastened by explosive expansion anchors, as a result of introducing an explosion-proof anchor at the wellhead drilled from an underground mine, the cross-sectional dimension of which is less than the length of the explosive anchor, and is faster the installation of explosive anchor relative to the explosion of the borehole explosive charge.

The technical result of the claimed invention is achieved by the fact that:

- a method of installing an explosive expansion anchor, including drilling a well from an underground mine through the ore body and lateral rocks, placing a pipe section from the side of its mouth in the well, introducing a detonating cord into the pipe section and blasting it, characterized in that the well is drilled to height section of possible collapse of these rocks, while installing an explosion-proof anchor with a length equal to the height of the section of possible collapse of these rocks, before placing in the well a pipe segment from the side of its mouth assembly of the upper part of the explosive expansion anchor by connecting the guide element, made in the form of a pipe segment with an oval bottom, at least. with one additional pipe section that can be extended to a predetermined length of the explosive expansion anchor, while a unit with a flexible thread for lifting the detonating cord is installed in the guide element, the flexible thread is pulled through an additional pipe segment and the assembled part of the explosion-proof anchor is inserted into the wellhead, then extended through an additional a piece of pipe a flexible thread is passed through a piece of pipe placed from the side of the wellhead, connect it to an additional piece of pipe and the assembled explosion structure the expansion anchor is moved upward by a distance equal to the length of the pipe segment placed on the side of the wellhead and installed in the well at the site of possible collapse of the lateral rocks, introducing into the cavity of the explosion-proof anchor a segment of the detonating cord with the first instant detonator capsule attached to it with the first shock the wave tube is carried out using a flexible thread enveloping the block mounted in the guide element by lifting and placing on the site between the block with a flexible thread and the end face explosive anchor, while in the well section in front of the mouth of the explosive anchor, a sealant is installed, the section of the well between its mouth and the sealant is filled with explosive initiated by a second delayed detonator capsule with a second shock wave tube, and a detonating cord segment with a first capsule attached to it - an instant detonator with the first shock wave tube is blown first, - and an explosive placed in the well in the area between its mouth and etizatorom initiated by the second detonator capsule delayed-action with the second shock wave tube, a second blow from a single source of initiation of the first and second shock-wave tubes,

- at the pipe section connecting sections, one pipe section with an external cone is fastened to the inner cone of the other pipe section by installing the external cone in the internal cone, while the protrusions evenly spaced along the circumference of the pipe segment with the external cone with protrusions cut on both sides parallel to the pipe axis slots, move along the guide grooves made in the sections of the pipe segment with the inner cone and install into holes located along the line separating the cylindrical and conical parts of the cut a pipe with an inner cone.

- in the cylindrical sections of the pipe sections, slots are provided that provide additional adhesion of the pipes to the walls of the well under the action of gas pressure in the explosion of a detonating cord.

Drilling of the well is carried out along the side rocks to the height of the site of possible collapse of these rocks, an explosion-proof anchor is installed with a length equal to the height of the site of possible collapse of side rocks. The length of the explosive anchor is equal to the height of the area of possible collapse of the side rocks, that is, the length of the well in this area. This is explained by the following. Two types of anchors are known. The bearing capacity of the first type of anchors is ensured by fixing the anchor at two points - at the mouth and around the bottom of the well. The site of possible collapse of lateral rocks is secured by its height by tensioning the anchor between the bottom and the wellhead by tightening the nut at the wellhead. In this case, the well is drilled outside the area of possible collapse of lateral rocks along stable lateral rocks, in which the anchor is fixed in the region of the bottom of the well and tightened by tightening the nut at the wellhead. Lateral rocks along the height of the area of their possible collapse are suspended, as it were, from stable lateral rocks on anchors. As a result, the length of the anchor exceeds the height of the site of possible collapse of the side rocks. However, such anchors cannot be used simultaneously for rock explosions. The bearing capacity of the second type of anchors, for example, explosive, is created by the adhesion of the surface of this anchor with the walls of the well along its entire length. In this case, the lateral rocks along the height of the area of their possible collapse are fastened with anchors, forming a layer of stable, lateral rocks, excluding their collapse. Then the length of the anchor is taken equal to the height of the site of possible collapse of lateral rocks, and the well is drilled only by the height of this section. Such a technical solution is aimed at installing an explosive expansion anchor, which is ahead of the blast hole explosive charge, increasing the stability of underground mine workings. This ensures the achievement of a technical result.

Before placing a section of pipe from the side of its mouth in the well, the upper part of the explosive expansion anchor is assembled by connecting a guide element made in the form of a pipe section with an oval bottom, at least. with one additional pipe section that can be extended to a predetermined length of the explosive expansion anchor, while a unit with a flexible thread for lifting the detonating cord is installed in the guide element, the flexible thread is pulled through an additional pipe segment and the assembled part of the explosion-proof anchor is inserted into the wellhead, then extended through an additional a piece of pipe a flexible thread is passed through a piece of pipe placed from the side of the wellhead, connect it to an additional piece of pipe and the assembled explosion structure the expansion anchor is moved upward by a distance equal to the length of the pipe segment placed on the side of the wellhead and installed in the well at the site of possible collapse of the lateral rocks, introducing into the cavity of the explosion-proof anchor a segment of the detonating cord with the first instant detonator capsule attached to it with the first shock the wave tube is carried out using a flexible thread enveloping the block mounted in the guide element by lifting and placing on the site between the block with a flexible thread and the end face explosive anchor,

Such technical solutions are aimed at installing an explosive expansion anchor, the length of which exceeds the cross-sectional dimensions of the underground mine. In addition, a guide element with an oval bottom significantly reduces the resistance to movement of the explosive expansion anchor along the well. This contributes to the achievement of a technical result.

A sealer is installed in the well section in front of the mouth of the explosive expansion anchor. This technical solution is aimed at preventing the explosive substance from filling the internal cavity of the explosive expansion anchor. As a result, simultaneous blasting of a detonating cord segment in an explosive anchor and explosive in a well is excluded. This contributes to the achievement of the technical result.

The well section between its mouth and the sealant is filled with explosive, initiated by a second delayed detonator capsule with a second shock wave tube. A segment of a detonating cord with a first instant detonator capsule attached to it with the first shock wave tube is blown first, and an explosive placed in the well in the area between its mouth and seal, initiated by a second delayed detonator capsule with a second shock wave tube explode second from one source of initiation of the first and second shock wave tubes. These technical solutions are aimed at the advanced installation of explosive anchor relative to the explosion of the borehole explosive charge. The result is a technical result.

In the sections of the connection of pipe segments, one pipe segment with an external cone is fastened to the inner cone of the other pipe segment by installing the external cone in the internal cone, while the protrusions evenly spaced along the circumference of the pipe segment with the external cone with slits cut on both sides of the protrusions parallel to the pipe axis , move along the guide grooves made in the sections of the pipe segment with the inner cone and install into the holes located along the line separating the cylindrical and conical parts of the segment tube with an inner cone. These technical solutions are aimed at connecting pipe segments without increasing the external and reducing the internal diameter of the pipe segments, which reduces the resistance to movement of the explosive expansion anchor up the well and helps to achieve a technical result.

On the cylindrical sections of the pipe sections, slots are provided to provide additional adhesion of the pipes to the walls of the well under the action of gas pressure in the explosion of a detonating cord. This is aimed at increasing the bearing capacity of the explosive expansion anchor of increased length and helps to achieve a technical result.

The invention is illustrated by drawings (figure 1 ÷ 7).

In Fig.1 ÷ 6 shows the installation position of the explosive expansion anchor before the explosion of the detonating cord and explosive in the well, Fig.7 - after the explosion of the detonating cord and explosive in the well.

Figure 1 shows a well drilled from an underground mine through an ore body beyond its contact with the side rocks along the height of the site of possible collapse of the side rocks.

Figure 2 - the upper part of the explosive expansion anchor, consisting of a guide element connected to an additional pipe segment. The upper part of the explosive anchor is installed at the wellhead.

Figure 3 - explosive anchor after assembly, installed at the wellhead,

Figure 4 - explosive anchor after its assembly, installed in the well at the site of possible collapse of lateral rocks.

Figure 5 - explosion-proof anchor after its assembly, installed in the well in the area of possible collapse of the side rocks with a detonating cord, the first capsule - instant detonator and the first shock wave tube.

Figure 6 - well before the explosion with an explosive expansion anchor inserted into it with a detonating cord segment, the first instant detonator capsule, the first shock wave tube, the explosive charge, the second delayed detonator capsule and the second shock wave tube.

7 is a longitudinal section of an underground mine after an explosion, showing explosive anchors installed in a site with possible collapse of lateral rocks and an ore body exploded by borehole charges.

The position of the installation method of explosive anchor according to the claimed invention are indicated by the following numbers:

- 1 - underground mining;

- 2 - well;

- 3 - ore body;

- 4 - lateral rocks;

- 5 - contact of the ore body with the lateral rocks;

- 6 - boundary of the site of possible collapse of lateral rocks;

- 7 - explosion-proof anchor;

- 8 - pipe segment, placed from the side of the wellhead;

- 9 - a guiding element made in the form of a pipe segment with an oval-shaped bottom;

- 10 - an additional segment of the pipe;

- 11 - the outer cone of the pipe segment;

- 12 - the inner cone of the pipe segment;

- 13 - longitudinal slots of the outer cone;

- 14 - elements of the outer cone with protrusions;

- 15 - elements of the outer cone without protrusions;

- 16 - holes in the pipe section with an inner cone;

- 17 - the protrusion of the element of the outer cone;

- 18 - longitudinal grooves of the inner cone;

- 19 - a line dividing the inner surface of the inner cone and the pipe section;

- 20 - the bottom of the oval shape of the guide element;

- 21 - block guide element;

- 22 - a flexible thread for lifting a detonating cord;

- 23 - clip for attaching a segment of a detonating cord;

- 24 - a segment of a detonating cord;

- 25 - the first instant detonator capsule;

- 26 - the first shock wave tube;

- 27, 28 - cracks in the cylindrical sections of pipe segments;

- 29, 30 - folding bumps formed by slots cut in cylindrical sections of pipe segments;

- 31 - the mouth seal of the explosive expansion anchor;

- 32 - the second delayed-action detonator capsule;

- 33 - the second shock wave tube;

- 34 - explosive;

- 35 - treatment chamber for mining;

- 36 - the roof of the treatment chamber, represented by lateral rocks;

- 37 - blasted ore body;

- 38 - soil underground mining.

The drawing (figure 1) shows an underground mine 1, well 2, ore body 3, a section of lateral rocks 4, contact 5 of the ore body with side rocks, border 6 of the plot of possible collapse of side rocks. Positions 7 ÷ 38 in the drawing (Fig. 1) are not visible, but are shown in the drawing (Fig. 2) - positions 9 ÷ 30, in the drawing (Fig. 3) - positions 7 ÷ -8, in the drawing (Fig. 6) - position 31 ÷ 34, in the drawing (Fig.7) - position 35 ÷ 38.

The drawing (figure 2) shows the upper part of the explosive expansion anchor 7, which is installed at the wellhead 2. The upper part includes an additional: pipe section 10 connected to the guide element 9, made in the form of a pipe section, with an oval bottom. In the drawing (FIG. 2), the outer cone 11 of the pipe segment, the inner cone 12 of the pipe segment, the longitudinal slots 13 on the outer cone 11 of the pipe segment, the elements of the outer cone of the pipe segment with protrusions 14, the elements of the outer cone of the pipe segment without protrusions 15, holes 16 on the section of the pipe segment with the inner cone, the protrusions 17 of the elements of the outer cone of the pipe segment, the longitudinal grooves 18 of the inner cone, the line 19 separating the inner surfaces of the inner cone and the pipe section, the bottom 20 is oval-shaped guide element, the block 21 of the guide element and, a flexible string 22 to lift the detonating cord segment slots 27, 28 on the cylindrical sections of pipe sections, foldable stoppers 29, 30 of slots in the cylindrical pipe sections. Positions 1 ÷ 6, 23 ÷ 26, 31 ÷ 38 in the drawing (Fig. 2) are not visible, but are shown in the drawing (Fig. 1) - positions 1 ÷ 6, in the drawing (Fig. 6) - positions 23 ÷ 26, 31 ÷ 34, in the drawing (Fig.7) - position 35 ÷ 38.

The drawing (figure 3) shows the assembled explosion-proof anchor 7, which is installed at the wellhead 2. The upper part of the explosion-proof anchor 7 is connected to a pipe segment 8 installed from the side of the wellhead 2. Names of the figures in the drawing (figure 3) are the same, as in the drawing (figure 2). Positions 1 ÷ 6, 23 ÷ 26, 31 ÷ 38 in the drawing (Fig. 2) are not visible, but are shown in the drawing (Fig. 1) - positions 1 ÷ 6, in the drawing (Fig. 6) - positions 23-26, 31 ÷ 34, in the drawing (Fig.7) - position 35 ÷ 38.

The drawing (figure 4) shows the assembled explosive expansion anchor 7, which is raised up the well 2 and installed in the area of possible collapse of the side rocks 4. Positions 1 ÷ 6, 23 ÷ 26, 31 ÷ 38 in the drawing (figure 4) are not visible , and shown in the drawing (Fig. 1) - positions 1 ÷ 6, in the drawing (Fig. 6) - positions 23 ÷ 26, 31 ÷ 34, in the drawing (Fig. 7) - positions 35 ÷ 38.

The drawing (Fig. 5) shows an explosive expansion anchor 7 installed in a well 2 at a site of possible collapse of lateral rocks 4 with a clamp 23, a detonating cord segment 24, the first capsule being an instant detonator 25 and the first shock wave tube 26 .. Position 1 ÷ 4, 31 ÷ 38 in the drawing (Fig. 5) are not visible, but are shown in the drawing (Fig. 1) - positions 1 ÷ 4, 31 ÷ 34, in the drawing (Fig. 7) - positions 35 ÷ 38.

The drawing (Fig.6) shows a well 2 before an explosion with an explosive expansion anchor 7 inserted into it with a detonating cord segment 24, a first instant detonator capsule 25, a first shock wave tube 26, a seal 31, and a second delayed detonator 32 , the second shock-wave tube 33 and the explosive charge 34 Positions 27 ÷ 30, 35 ÷ 38 in the drawing (Fig.6) are not visible, and shown in the drawing (Fig.5) - position 27 ÷ 30, in the drawing (Fig. 7) - positions 35 ÷ 38.

The drawing (Fig. 7) shows a longitudinal section of an underground mine 1 after an explosion with installed explosive expansion anchors 7 in a section with possible collapse of lateral rocks 4. The treatment chamber 35 for mining, the roof 36 of the treatment chamber 35, represented by the side rocks, exploded ore body 37, located on the soil 38 of the underground mine 1. Positions 1, 3, 5, 8 ÷ 34 in the drawing (Fig. 7) are not visible, but shown in the drawing (Fig. 1) - positions 1, 3, 5, in the drawing (Fig. 3) - positions 7 ÷ 30, in the drawing (Fig. 6) - positions 31 ÷ 34.

The installation method of explosive anchor is as follows. Application conditions - a 10.0 m shallow-lying ore body lies in unstable lateral rocks. During ore mining, lateral rocks collapse and significantly reduce the efficiency of mining operations. The height of the underground mine for drilling is 2.5 m. The height of the area that could collapse lateral rocks is 4.0 m. The length of the explosive anchor equal to 4.0 m exceeds the height of the underground mine for drilling - 2.5 m. We use the installation method of explosive expansion anchor from underground mining according to the claimed invention.

To do this, from underground mining 1 drill a borehole 2 with a depth of 10.0 m through ore body 3, cross its contact 5 with lateral rocks 4 and drill at a section of lateral rocks 4 high from contact 5 of ore body 3 with lateral rocks 4 to border 6 within which the lateral rocks collapse. The height of the site of possible collapse of lateral rocks is 4.0 m. The length of the explosive expansion anchor is taken equal to the height of this section, that is 4.0 m.

Block 21 with flexible thread 22 for lifting the detonating cord is installed in the guide element 9, made in the form of a pipe segment with an oval bottom 20. Both ends of the flexible thread 22 are pulled through the inner cavity of at least one additional pipe segment 10. An additional pipe segment 10 is connected to the guide element 9 by introducing the outer cone 11 of the additional pipe segment 10 into the inner cone 12 of the guide element 9. Moreover, the elements of the outer cone with the protrusions 14 enter the longitudinal grooves 18 of the inner cone 12 of the guide element 9, and the elements of the outer cone without protrusions 15 slide along the surface of the inner cone 12 of the guide element 9, approaching the and 19 separating the inner surface of the inner cone 12 and the pipe section of the guide element 9. The longitudinal slit 13 the outer cone 11, an additional pipe section 10 is reduced stiffness outer cone 11 and facilitate the installation of the projections 17 in the holes 16 in the tube segment portion of the guide element 9.

A guide element 9 connected to an additional length of pipe 10 is inserted into the wellhead 2. Both ends of the flexible thread 22, stretched through the internal cavity of the additional length of pipe 10, are passed through a length of pipe 8 placed from the side of the well 2.

A segment of pipe 8, placed from the side of the wellhead 2, is connected to an additional segment of pipe 10 by introducing an external cone 11 of a segment of pipe 8 into the inner cone 12 of an additional segment 10. In this case, the elements of the outer cone with protrusions 14 are included in the longitudinal grooves 18 of the inner cone 12 of the additional segment the pipe 10, and the elements of the outer cone without protrusions 15 slide along the surface of the inner cone 12 of the additional pipe section 10, approaching the line 19 separating the inner surfaces of the inner cone 12 and the additional section and pipe 10. The longitudinal slit 13 the outer cone 11 of pipe section 8 reduces the rigidity of the outer cone 11 and facilitate the installation of the projections 17 in the holes 16 of the pipe segment 10 optional.

The guide element 9, connected to an additional pipe segment 10 connected to a pipe segment 8, is introduced into the wellhead 2 by moving upward by the length of the pipe segment 8.

Explosion-proof anchor 7 is moved uphole 2 to a site of possible lateral rocks 4. A segment of detonating cord 24 is attached with a clamp 23 to a flexible thread 22. To the lower end of a segment of detonating cord 24 is connected the first instant detonator 25 capsule in a case protected from damage from the first shock -wave tube 26, lift and install inside the explosion-proof anchor 7.

Withdrawn from the well 2, two flexible threads 22 are fixed in the underground mine 1, and the first shock wave tube 26 is left free.

Install the sealant 31 of the mouth of the explosive expansion anchor, preventing the filling of the internal cavity of the explosive anchor 7 with explosive 34 when charging the well 2.

Fill the well 2 by installing a second delayed-action detonator capsule 32 with an action cartridge and a second shock wave tube 33.

From the well 2, a first shock-wave tube 26, a second shock-wave tube 33 are connected, they are connected to one source of initiation of the first 26 and second 33 shock-wave tubes, for example, to a detonating cord, which is an element of the general scheme of an explosive mass explosion network and initiated by an electric detonator.

The first instant detonator capsule 25 and the second delayed detonator capsule 32 are initiated from one source of initiation, that is, blasting means located in the well 2 initiate in one blasting operation.

In the process of this technique, the detonating cord section 24 is blown first. The gases generated during the explosion of high pressure and temperature press the walls of the pipe sections of the explosion-proof anchor 7 tightly against the walls of the well 2, the folding bends are introduced into the rock during their bending, increasing the bearing capacity of the explosion-proof anchor 7.

As a result of the explosion of a segment of the detonating cord 24, the side rocks 4 are strengthened in the area of their possible collapse between the contact 5 of the ore body with the side rocks and the boundary 6 of this section before the explosion of the explosive in the well 2.

In the same process, 1-2 seconds after the initiation of the first instant detonator capsule 25, the second delayed detonator capsule 32 is blown up, which detonates the explosive 34 in the well 2. In this explosion, the ore body 3 is crushed, and a treatment chamber is formed 35 with a roof 36 of the treatment chamber 35 and an exploded ore body 37 on the soil 38 of the underground mine 1.

The formed roof 36 is stable and not capable of collapsing, since the side rocks 4 are fixed by installed explosion-proof anchors 7.

Thus, explosion-proof anchors 7, installed ahead of the explosion of borehole charges, contribute to the formation of the treatment chamber 35, creating instead of the site of possible collapse of the side rocks, creating a stable roof from the side rocks of the treatment chamber 35, increasing the efficiency of mining, the result is a technical result.

The originality of the claimed invention lies in the introduction into the well of an explosive expansion anchor with an increased bearing capacity of a length exceeding the cross-sectional dimensions of the underground mine, as well as in the advanced installation of an explosive expansion anchor relative to a blast hole explosion

Claims (3)

1. A method of installing an explosive expansion anchor, including drilling a well from an underground mine through the ore body and lateral rocks, placing a section of pipe from the side of its mouth in the well, introducing a detonating cord into the pipe section and blasting it, characterized in that the well is drilled along the side rocks to the height of the site of possible collapse of these rocks, while installing an explosion-proof anchor with a length equal to the height of the site of possible collapse of lateral rocks, before placing a pipe section from the side in the well Now its mouths assemble the upper part of the explosive expansion anchor by connecting the guide element, made in the form of a pipe segment with an oval bottom, to at least one additional pipe segment, expandable to a predetermined length of the explosive expansion anchor, while the unit with a flexible thread for lifting the detonating cord installed in the guiding element, the flexible thread is pulled through an additional pipe segment and the assembled part of the explosive expansion anchor is introduced into the wellhead, after which it is pulled through the additional the underbody pipe, a flexible thread is passed through the pipe section placed from the side of the wellhead, connected to an additional pipe section, and the assembled structure of the explosion-proof anchor is moved upward by a distance equal to the length of the pipe section placed from the side of the wellhead and installed in the well at the site of possible collapse lateral rocks, introducing into the cavity of the explosive expansion anchor a segment of a detonating cord with the first capsule attached to it - an instant action detonator with the first impact a new tube is carried out using a flexible thread enveloping the block installed in the guide element by lifting and placing on the section between the block with the flexible thread and the end face of the mouth of the explosive expansion anchor, while a sealant is installed in the well section in front of the mouth of the explosive expansion anchor, the section of the well between its mouth and a sealant is filled with an explosive initiated by a second capsule — a delayed detonator with a second shock wave tube, and a detonating cord segment with attached the first capsule, the instant detonator with the first shock wave tube, is blown first, and the explosive placed in the borehole between its mouth and the sealant, initiated by the second capsule, the delayed detonator with the second shock wave tube, is blown second from one the source of initiation of the first and second shock wave tubes. 2. The method of installing the explosion-proof anchor according to claim 1, characterized in that at the pipe connecting portions one pipe section with an external cone is fastened to the inner cone of another pipe section, installing the external cone in the inner cone, while the protrusions evenly spaced along the circumference of a pipe segment with an external cone with slots cut on both sides of the protrusions parallel to the axis of the pipe, move along the guide grooves made in the sections of the pipe segment with the internal cone and install into the holes located wives along the line dividing the cylindrical and conical parts of the pipe segment with the inner cone. 3. The method of installing the explosion-proof anchor according to claim 1, characterized in that gaps are provided on the cylindrical sections of the pipe segments to provide additional adhesion of the pipes to the walls of the well under the influence of gas pressure during the detonating cord explosion.

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