Method to install anchor and device for its realisation

FIELD: mining.

SUBSTANCE: method of anchor installation includes drilling a blast hole in a mine wall, insertion of a spiral into it, as well as an anchor rod with a helical groove at the external surface and impression of the spiral turns into the blast hole walls. At the same time at first the spiral is inserted into the blast hole, and then the anchor rod is screwed into it, deforming the cross section of the spiral turns as they are impressed into the blast hole walls. Dimensions of the anchor rod are selected such that the cross section of the spiral turns in the initial condition is more than the distance between the blast hole walls and the bottom of the helical groove of the anchor rod.

EFFECT: increased reliability of anchor adhesion to blast hole walls.

8 cl, 3 dwg

 

The technical solution relates to mining and can be used for fastening openings, as well as for mounting of various products to the walls and ceilings of buildings.

There is a method of installing the spacer anchor auth. St. USSR №1776811, CL E21D 20/00, publ. in BI No. 43, 1992, including placing on the wedging cone head anchor rod wire helix, the introduction of the anchor in the drilled hole and indentation of spiral turns in the walls of the borehole by longitudinal movement inside her head anchor rod. After insertion of the anchor into the drilled hole turns of wire on its head squeeze through the installation of the pipe. In the compressed state, the diameter of the wire helix 5÷10 mm larger than the diameter of the bore-hole. Longitudinal movement of the head inside the spiral is carried out by screwing in her deep end of the rod.

In a known way clutch anchor with fixed breed occurs only at the site of contact of spiral turns with the head of the anchor rod. In this place the focus voltage, greatly reducing the allowable load on the anchor rod and the reliability of its coupling with a rock because of the possibility of destruction of the walls of the bore-hole. Therefore, the method has a relatively low efficiency.

The closest in technical essence and essential features it is the method of installation of the anchor by the RF patent №2353776, CL E21D 20/00, E21D 21/00, publ. in BI No. 12, 2009, including placing on the anchor rod wire helix, the introduction of the anchor in the drilled hole and indentation of turns of the wire helix in the wall of the borehole. The coiled wire is placed on the rod in made it the spiral groove. The diameter of the wire spiral perform larger than the diameter of the hole, and the insertion in the borehole for the end of the wire helix is fixed on the anchor rod and rotate in the direction in which the diameters of the turns of the wire helix is reduced. After that, the indentation of turns of the wire helix in the wall of the borehole carry out the elastic forces of the wire spiral.

In this way rotation of the anchor exercise throughout putting it in the hole, regardless of the length of the site on which you want to concatenate it with a rock. The spiral need to place and fix its end on the anchor rod. For indentation of spiral turns in the walls of the hole you want to apply a spiral, able to create a relatively large force of elasticity, which increases their cost. All this accounts for its relatively low efficiency.

Known removable anchor auth. St. USSR №1731958, CL E21D 21/00, publ. in BI No. 17, 1992, including metal anchor rod with a screw thread and shank. It is equipped with a tubular rod, cut to screw the howl line increments, equal to the thread pitch truss rod. The thread profile has a guide and the presser part and the head part of the rod guide of the thread is made of greater height than the remainder.

For installation of such required anchor screw anchor rod with screw thread attached to its tubular rod that because of the increasing friction as the occurrence of the anchor rod in the tubular rod substantially increases the complexity. This anchor should be in the hole and tightly prodavlivaetsya to its surface, which is necessary to pass through the holes without deviating from the given diameter and shape along the length. The implementation required for such anchor precision drilling holes in the terms of existing mining enterprises is well-known difficulties. All this accounts for the relatively low efficiency of the anchor.

The closest in technical essence and essential features is the anchor on the patent of Russian Federation №2353776, CL E21D 20/00, E21D 21/00, publ. in BI No. 12, 2009, includes an anchor rod having on its outer surface a helical groove in which is placed a wire spiral with a diameter larger than a diameter of the borehole. When you type in the borehole for the end of the wire helix is fixed on the anchor rod, and on coming out of the hole the end of the anchor rod made the head to rotate it with a key./p>

This anchor must be rotated throughout the entry hole, regardless of the length of the site on which you want to concatenate it with a rock. Introduced into the borehole cable end must be secured to the anchor rod. The original clutch anchor with rock seems to be relatively weak, as is done only by the elasticity of the spiral. As a result, the anchor has a relatively low efficiency.

Solved the technical problem is to increase the efficiency of the method and device for increasing the reliability of the clutch anchor with the walls of the bore-hole.

The task is solved in that in the method of installation of the anchor, including the drilling of hole in the wall framing, the introduction of spiral anchor rod with a spiral groove on the outer surface and the indentation of spiral turns in the wall of the hole, according to the technical solution is first injected in the borehole spiral, and then twist in her anchor rod, deforming the cross section of the spiral turns when driving them into the walls of the borehole, and the sizes of the anchor rod is chosen so that the cross-section of the spiral turns in the original condition was greater than the distance between the walls of the bore-hole and bottom screw groove of the anchor rod.

The method implements the idea of using a spiral with the possibility of deformation of the transverse secheniae coils, what it tightly to the walls of the borehole in a relatively large area and therefore its contact with the rock decreases stress concentration, which increases the load on the anchor. With the durability of adhesion of the anchor to rock also increases due to its interaction even with microscopic irregularities on the walls of the borehole. The choice of sizes of anchor rod so that the cross-section of the spiral turns in the original condition was greater than the distance between the walls of the bore-hole and bottom screw groove of the anchor rod, is a necessary condition for a firm contact of the anchor with a rock. The result is improved efficiency of the method by increasing the reliability of the clutch anchor with the walls of the bore-hole.

Appropriate length of the helix to choose equal or lesser length section of the borehole, which is located outside the area separation wall framing. This significantly reduces the cost and complexity of installation of the anchor, as in almost the same reliability of fastening of production decreases the number of revolutions of the anchor rod, which is required for the installation of the anchor.

The task is solved in that the device for installation of the anchor in the borehole, comprising an anchor rod with a spiral groove on the outer surface and the spiral, according to the technical solution is s spiral coils made with the possibility of deformation of the cross-section, when this cross-section of the turns of the spiral is made larger than the distance between the walls of the bore-hole and bottom screw groove of the anchor rod.

The coils of the spiral with the possibility of deformation of their cross-sections determine the coincidence of the outer surface of the anchor with the rough surface of the hole, which significantly increases its coupling with a rock. The spiral can be made of material that compared with a spring steel is cheaper and does not require special training. This simplifies and anchor design, eliminating the need for fastening the end of the spiral on the anchor rod. The implementation of the cross-section of the spiral turns greater than the distance between the walls of the bore-hole and bottom screw groove of the anchor rod that allows for installation in boreholes, covered with a relatively large variation in their diameters. This is due to the fact that the spiral in the proposed device is expected to perform various profiles that can change their shape. All of this increases the efficiency of the device by increasing the reliability of its coupling with the walls of the hole, and at a lower cost to manufacture.

It is advisable to introduce into the hole the end of the anchor rod to the depth of the helical grooves to reduce. This is when installing the anchor substantially reduces the time dependence of the rotation the Oia anchor rod from the length of the spiral. In this case, the main friction associated with the deformation of the spiral turns, falls at the site of contact of the spiral with the part of the anchor rod (where the depth of the helical grooves is reduced), in which the distance between the bottom of the screw groove and the walls of the borehole least. The rest of the anchor rod is screwed into a spiral as the screw in the nut without significant friction.

It is advisable to spiral to run out of tape, convex to the axis of the device. This allows a large extent change the deformation capability of the cross-section of the turns of the spiral, for example, by selecting the curvature of the convexity of the tape and its thickness. This results in a simpler implementation of the required conditions for deformation and implementation of spiral turns in the rocks, which increases the efficiency of the device.

It is facing the bottom of the bore-hole end of the spiral to perform the protrusion is offset from its axis. This reduces the probability of the spin spiral in the hole when screwing in her anchor rod.

It is advisable in facing the bottom of the bore-hole end of the spiral insert the plug on the end of which set the circle on the axis of rotation is offset from the center of the circle and the axis of the tube. This eliminates the spin spiral in the hole.

It is advisable to introduce into the hole the end of the anchor rod to perform stepwise refinement, which insert at the end of IPN is Ali. This eliminates jumping with spiral anchor rod and, thereby, its jamming in the gap between the walls of the borehole and the anchor rod while moving to the bottom of the hole.

The essence of the technical solution is illustrated by the example of specific performance and the drawings figure 1-3.

1 shows a diagram of the installation of the anchor and device for its implementation, a longitudinal section; figure 2 - scheme installed in hole device, a longitudinal section; figure 3 - tube installed on her butt around, inserted into the end of the spiral, longitudinal section.

Method implemented using devices of the same purposes as follows.

In the drilled from the tunnel (not shown) in a rock mass 1 (1) hole 2 until it stops in his face, introduce a device consisting of helix 3, made with the possibility of deformation of the cross-section of its turns and facing the bottom of the borehole 2, tab 4 at the end, offset from its axis, and the anchor rod 5 (hereinafter - rod 5) with a screw groove 6 (hereinafter - the groove 6) on the outer surface and the cylinder 7 to rotate the key. First in the borehole 2 enter the coil 3 by means of rod 5, which follows it. Helix 3 is made of ribbon, convex to the axis of the device. On insertion in the borehole 2 the end of the rod 5, the depth of the groove 6 is reduced. The dimensions of the rod 5 is chosen so that the cross-section VI the Cove helix 3 in the initial state was a big, than the distance between the walls of the borehole 2 and the bottom of the groove 6 of the rod 5. Length of the helix 3 is chosen equal or lesser length section of the borehole 2, which is located outside the area separation wall framing. In facing the bottom of the borehole 2 (Fig 3) the end of helix 3, the inserted tube 8, on the end of which is set circle 9 on the axis 10 of rotation is offset from the center of the circle 9 and the axis of the tube 8. On insertion in the borehole 2 the end of the anchor rod made of stepwise refinement 11, which is inserted in the end of helix 3. Then in helix 3 twist the rod 5 and thereby deform it turns arching effort on the part of the rod 5. In the spiral coils 3 are tight to the rock and partially embedded in it. The external surface of the helix 3 takes the form of a surface of the borehole 2, from which the anchor is securely bonded to breed array 1.

The torque on the head 7 increases as the screw rod 5 in the coil 3 due to the increase of friction due to the greater length of their mutual contact. In the proposed device, this increase in friction is reduced to the minimum by reducing (not shown) for insertion in the borehole for the end of the rod 5, the depth of the groove 6.

The relatively large deformation of the cross-section of the turns of the helix 3, which provides the ability to install the device in the bore-holes 2 with a significant p is spocom their diameters, is achieved by fulfilling its profile, capable of relatively easy to change the shape under the action of external loads. For example, the coil 3 can be made of tubes of different shape (rhombic, square and so on), channel area. The implementation of the helix 3 of the tape, convex towards the axis of the device, due to the simplicity of its implementation and economic feasibility.

Screwing the rod 5 in helix 3 are produced in the direction of thrust of the spiral 3 in the wall of the borehole 2. In addition, the initial diameter of the helix 3 can be performed such that it is moved in the borehole 2 with a little effort and it coils tightly to the rock. Therefore, in most cases, additional measures to hold spiral 3 from rotating in the hole 2 is not required. Together with these cases spin helix 3 in the hole 2 is possible, for example, by drilling 2 holes in the clay moist (slippery) rocks or when technological deviations of the diameter of the borehole 2 is significantly larger than the diameter of the helix 3. Therefore, the device is to hold spiral 3 from rotating. For example, you can perform on facing the bottom of the borehole 2 the end of helix 3 of the protrusion 4 (figure 1), which is offset relative to its axis. The protrusion 4 interacts with the surface irregularities of the face and reduces the possibility of rotating the helix 3. When this rod 5 podavlyayut with IRL 3 to the slaughter, from which the coil 3 increases its diameter and is pressed against the walls of the borehole 2. Possible introduction in facing the bottom of the borehole 2 (Fig 3) cable end 3 of the tube 8, the end of which is set circle 9 on the axis 10 of rotation is offset from the center of the circle 9 and the axis of the tube 8. This is based on known patterns of interaction between the two cylindrical bodies, the joint offset from the axis of rotation, prevents rotation of helix 3 in any part of the borehole 2. The width of the grooves 6 takes into account all possible errors of manufacture and installation of helix 3 in the hole 2.

1. The method of installation of the anchor, including the drilling of hole in the wall framing, the introduction of spiral anchor rod with a spiral groove on the outer surface and the indentation of spiral turns in the wall of the borehole, wherein the first hole is injected spiral, and then twist in her anchor rod, deforming the cross section of the spiral turns when driving them into the walls of the borehole, and the sizes of the anchor rod is chosen so that the cross-section of the spiral turns in the original condition was greater than the distance between the walls of the bore-hole and bottom screw groove of the anchor rod.

2. The method according to claim 1, characterized in that the length of the helix is chosen equal or lesser length section of the borehole, which is located outside the area stratification article is NOC output.

3. Device for installation of the anchor in the borehole, comprising an anchor rod with a spiral groove on the outer surface and the spiral, characterized in that the spiral coils made with the possibility of deformation of their cross-section, while the cross-section of the turns of the spiral is made larger than the distance between the walls of the bore-hole and bottom screw groove of the anchor rod.

4. The device according to claim 3, characterized in that the insertion in the borehole for the end of the anchor rod, the depth of the helical grooves is reduced.

5. The device according to claim 3, characterized in that the spiral is made of ribbon, convex to the axis of the device.

6. Device according to any one of p 5, characterized in that recourse to the bottom of the bore-hole end of the spiral is made protrusion is offset from its axis.

7. Device according to any one of p 5, characterized in that in facing the bottom of the bore-hole cable end inserted tube, on the end of which is mounted a circle on the axis of rotation is offset from the center of the circle, and the axis of the tube.

8. Device according to any one of p 5, characterized in that the insertion in the borehole for the end of the anchor rod made of stepwise refinement, which is inserted into the end of the spiral.



 

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3 dwg

Fluid regeneration // 2398968

FIELD: mining.

SUBSTANCE: after installation of mining anchor with anchor bolt, in particular expandable friction tubular anchor with end cartridge in front, into previously drilled well, adapter is installed on cartridge with the possibility to supply and drain the liquid. On the one hand, using injection pipeline of excess pressure maintenance, excess pressure is developed, which fixes adapter on cartridge. On the other hand, fluid rushes along expansion pipeline into anchor bolt and starts filling it. At the same time anchor bolt, due to pressure rise, under action of excess pressure, expands in drill hole, so that its external surface presses its walls and therefore fixes mining anchor in drill hole. Due to the possibility to supply gas with the help of adapter, pressurised gas, for instance compressed air, may be supplied into anchor bolt prior to and/or after its expansion.

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4 cl, 1 ex

FIELD: mining.

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EFFECT: preliminary strengthening of acute-angled block between branching mine tunnels, reduced hazard of shaft-sinking and tunneling works.

2 cl; 3 dwg

FIELD: mining.

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EFFECT: providing of automatic filling of borehole by consolidating mass along its whole length, reduction of time required for mass consolidation, improving of safety of mining operations.

19 cl, 4 dwg

FIELD: mining industry, particularly for supporting stall roofs.

SUBSTANCE: method involves drilling boreholes in roof and extending boreholes to perform breaking; pouring fixing mix into boreholes; loading explosive charges and blasting thereof, wherein anchor is introduced in bottomhole section and wooden self-loosened plug is placed between explosive charge and the anchor.

EFFECT: increased supporting reliability and operating safety.

4 dwg

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