SU1553709A1 - Tensionable roof bolt - Google Patents

Abstract

This invention relates to underground construction and mining. The purpose of the invention is to reduce the time to install the anchor and increase the safety of work. The tension anchor includes reinforcing elements (AE) 5, a fixing tube (T) 1, worn on AE 5, a support tip 13 and a single fixture 12. The latter is connected to the protruding ends of the AE 5, with AE 5 framing a flexible hermetic sheath 4 of synthetic material, turned inside out and connected at one end to the deep ends of AE 5. Its other end is connected to the inner surface of T 1. It is made in the form of a conductor for securing the wellhead 2. At the ends T 1 has an outer 15 and 14 inner flanges and sealing cuffs 17 and 16. First T 1 is introduced into the drilled well 2 and fixed in it with binder solution 3. The latter is fed into the well 2 through the injection pipe 6. After the solution 3 has completely cured, the shell 4 is turned inside out and pumped through the pipe 7 anti-corrosion working fluid 22. Under the pressure of this liquid The unwrapped casing 4 straightens and pulls the AE 5 into it into the borehole 2. After the stop 12 stops against the head 13 under the pressure of the fluid 22, the AE 5 is tensioned. Upon reaching the required tension of the AE 5, the casing 4 is fixed by omono ichivani binder solution 21. 6-yl.

Description

The invention relates to underground construction and mining deluvs namely anchoring.

The purpose of the invention is to reduce the time to install the anchor and increase the safety of work.

FIG. 1 shows a tension anchor in the working position, general view | FIG. 2 shows the step of fixing a fixing pipe at the wellhead when installing an anchor; in fig. 3 shows the insertion and tensioning stage of the reinforcing elements 5 of FIG. 4 - view A tsa of FIG. } j in FIG. 5 - section bb yes fig. ka fig, section bb in fig. one "

The tension anchor includes a fixed pipe 1, fixed at the wellhead 2 by means of a bonding solution 3, a flexible hermetic synthetic sheath 4 9 reinforcing elements 5, for example, in the form of metal rods, which inject 6-8. for supplying the binder solution 3 to different parts of the well 2, equipped with taps 9-11, and a single fixture 12, which interacts with the supporting tip 13,

The locking tube 1 is made in the form of a conductor, has end flanges 14 and 15, and sealing cuffs 16 and 179 in contact with them, for example, from rubber. The inner end flange 14 is made of the same diameter with the bore 2, and the outer end flange 15 has a larger diameter. A flexible hermetic casing 4 made of synthetic material surrounds the reinforcing elements 5 along their entire length and is connected with the reinforcing elements 5 in the end portion of the well by means of the node 18,

Reinforcing elements 5 on the wellhead side are connected to a single latch 12 via unit 19, Single latch 12 is equipped with a sealing cuff 20. Flexible sheath 4 is connected to the walls of borehole 2 by means of a quick hardening binder solution 21, and inside is filled with an anticorrosive working fluid 22 anti-corrosive reinforcing elements 5; A tube 23 serves to remove air from the well,

Attached to the inner surface of the fixing tube 1, for example, i glued, the end of the flexible shell 4, the opposite end of the flexible shell ™

0

five

five

five

The ki 4 is turned inside out and fastened to the deeper ends of the reinforcing elements 5 by means of the knot 18, and the opposite ends of the reinforcing elements 5 are connected to the single latch 12 by the knot 19.

The tension anchor is set as follows.

At the first stage of the installation of the anchor in the constructed development of the drill hole bore 2 under the anchor. The tension anchor is delivered to the installation site. A fixing pipe 1 is inserted into the borehole 2 until the flange 0 15 stops against the wellhead rock 2. The injection solution 3 is fed through the injection pipe b into the annular gap between the outer surface of the fixing pipe J and the borehole 2, Outflow binder solution 3 from the annular gap is prevented by end flanges J4 and J5 and sealing cuffs 16 and 17. After the annular gap is completely filled with binder solution 3, they overlap the valve 9. In this position, the fixing tube 1 is held until it is completely cured binder solution 3. At this time, you can carry out similar work on the installation of adjacent anchors.

In the second stage, the working fluid 22 is pumped through the injection tube 7 into the gap between the glued end of the flexible shell 4 and the end not turned inside out and not fastened to the fixing tube 1 turned inside out. As the pressure increases in the line and the injecting tube 75, the flexible shell 4 tries to turn out again in the initial position). At the same time, it will move inwardly into the borehole 2, which is not fastened to the fixing pipe 1, to the end of which reinforcing elements 5 are attached with the aid of unit 18. in the reference cap 13,

With continued injection (injection) into the flexible hermetic sheath 4 of the working fluid 22, a single latch 12 presses the wellhead 2 onto the rock. Head 13, Increasing the pressure in the line is accompanied by the creation of proportional tension in the reinforcing elements 5. Thus the tension of the anchor occurs. .

515

When the required tension is reached, the valve 10 on the tube 7 closes and maintains pressure in the flexible shell 4 until it is fixed in the well 2. The flexible shell 4 in the well 2 is fixed, for example, by injection through a quick-hardening binder 21 in the injection tube 3 The annular gap between the borehole 2 and the flexible shell 4. After filling the specified gap with the bonding solution 21 and curing the latter, the anchor can perceive operational loads.

For the flexible sheath 4, nylon fabric, glass or basalt, pretreated with hydrophobic substances can be used.

mi, which use paraffin silicone fluids, oils, etc. The material for the flexible shell can be combined, for example, from any specified fabric, combined with rubber (rubber) or synthetic composite material.

Compounds based on mineral and organic substances, cement, liquid glass or synthetic resins are used as binding solutions 3 and 2). The reinforcing elements 5 are usually made of steel reinforcing strands, however, strands made of glass or alto fiber can be used,

The air from the wells during the injection of the binder solution 3 is removed using a cambric tube, which can, for example, be attached to the flexible sheath 4. A composition of the following composition can be used as the working fluid 22, May

Liquid silicate

glass100

Urea formaldehyde resin20-80

Surfactant from

class of alkyl sulfonates 0.05-0.2

Isocyanate-containing substance, for example, grade B polyisocyanate

, 0

0

Basalt scales, modified with enny benzylpyridinium chloride 80-270

Said working fluid has good mobility due to low viscosity and slight surface tension. Therefore, it is easily transported along the line, has 15 alkaline medium (pH), which reliably protects metal reinforcing elements from corrosion even in very aggressive environments, for example, when installing anchors in the rock with pronounced sulfate aggression. In addition, the working fluid is capable of curing over time. Moreover, in the cured state, such a composition has 5 very significant tensile strength.

Claims (1)

Claims An inventive tension anchor comprising elements, a fixing tube worn on them, a bonding solution, injecting tubes for supplying the binder solution, a supporting tip and a single fixator interacting with it, associated with protruding ends of the reinforcing elements, characterized in that in order to shorten the installation time of the anchor and increase work safety the anchor is equipped with a flexible, hermetic synthetic material shell surrounding the reinforcing elements, the torus is turned inside out and connected at one end with the deep ends reinforcing elements, and the other with the inner surface of the fixing tube, while the latter is made in the form of a conductor with outer and inner flanges and sealing cuffs at the ends. J w 16 st // S X X "I 6  -, ..- ljl ". . . sggss /five M 13 5 to nmos FIG. i tj FIG. 6