SU1465593A1 - Method of setting tubular roof bolt - Google Patents

Abstract

The invention relates to mining and improves the reliability of securing the anchor. On the outer surface of the tubular body (TK) 2 of the anchor are placed a helically tape additional charge (LDZ) 3 of the primed substance (BB). Distributed main explosive charge - detonating hole 4 is placed into the cavity of TC 2. The tail part of the anchor is sealed.

Description

one

The invention relates to mining, and specifically to methods of installing tubular anchor lining.

The purpose of the invention is to increase the reliability of securing the anchor and prevent the anchor from slipping in the hole under dynamic loads.

FIG. I shows a tubular anchor placed in the hole before it is exploded; in fig. 2 - the same, after fixing.

FIG. 1 and 2 are indicated: bore hole 1, tubular body 2, and a charge of explosive 3; detonating cord 4 in the cavity of the tubular body; sealing plug 5; liquid 6; plug 7, means 8 and 9 of the primer, notch 10 on the walls of the hole, spiral , rib 11 stiffness anchor

The installation method of the tubular anchor is carried out as follows.

Before installing the anchor hole, the hole of the hole 1 on the outer surface of the tubular body 2 contains a spirally tape additional charge 3 of the substance (for example, a thread of detonating ishur). Distributed along the length of the main charge of the onset substance in the form of a detonating cord 4j, then the tail part of the anchor is sealed with a stopper 5, and the cavity of the tubular KopnyCei is filled with a transfer medium 6 (for example, liquid). After that, the detonating cord 4 is centered with the stopper 7 and the anchor is inserted into the hole 1. Then the switching network (not shown) is mounted, and the external and external charge are connected.

tubular body 2 with tools

8 and 9 explode and explode. In this case, the charge of -3 bristle substance, located on the outer surface of the tubular body 2, is initiated ahead of the charge 4. The lead time

is selected depending on the physical properties of the rocks and the stress state of the massif, for rocks with a strength of 16–20, the running time is 1-2 s.

To prevent the anchor from slipping in the borehole under dynamic loads, the additional charge of the extinguishing substance is: spiral in a variable pitch. With this winding

At one end of the tubular body, a segment of the detonating cord is secured (for example, with a twine, insulating tape) and the detonating cord is wound with the rotation of the tubular body, and the angle of the detonating cord with the tubular body is changed during the winding process. The second end of the segment DI in order to avoid arbitrary razmazshani turns

also secured to the tubular body.

After blasting the charge 3 of the blasted substance under the action of the detonation products, a spiral recess 10 is formed on the walls of the bore-hole, and after the charge 4 blasts 4 located inside the anchor body 2, a radially directed hydraulic shock occurs, which ensures the flapping of the tubular body 2 in the bore hole 1 , and on the anchor is formed a spiral edge 11 stiffness, by ,; by means of which the anchor is additionally secured in the rock mass.

An example. When mounting a ventilation unit with a section of 2X2 m on the mountains. +345 m, covered in ore

nom massif with a fortress on the scale of prof. M.M. Horsetail f 15–16, vertical holes in the roof of the mill are drilled on a grid of 0.8 x 0.8 m and vertical holes with a diameter of 40 mm and a depth of 2 m. The anchor body is made of steel pipes with an outside diameter of 33.5 mm (GOST 3262-62) cut into lengths of 2.1 m. On the outer surface of the pipe with a twine secured a piece of detonating cord of the brand Dae-1 2 with a winding pitch of 8-15 cm. The detonating cord is placed into the internal cavity of the pipe, filled with water , and the ends of the pipe are sealed with polyethylene plugs, fitted with an axial hole for skip detonating cord. (After that, the anchor is inserted into the hole and blasting is performed. The initiating detonators are used as initiating agents to initiate a charge located on the outer surface of the tubular body and

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1465593

2 seconds to initiate an internal charge. The support plate is formed on the pipe section of 10-12 cm, protruding from the hole into the mine workings.

F o rmu l invention

Claims (2)

1. The method of installing a tubular anchor, including drilling a hole, placing in the cavity a tubular body of the anchor distributed along the charge length of a cramping substance, filling the remaining gap with a transfer medium, inserting the anchor into the drill wire, securing it by initiating and detonating the charge, characterized in that in order to increase the reliability of fixing the anchor, the spiral surface of an additional explosive charge is placed on the outer surface of the tubular body of the anchor, while the initiation of the latter is performed ahead of the charge placed in the cavity of the anchor. 2. Method pop. l, which differs from the fact that, in order to prevent the anchor from slipping into the rod under dynamic loads, the additional charge of the explosive substance is placed with a variable ribbed helix. FIG. 2