SU1416705A1 - Anchor construction method - Google Patents

Abstract

The invention relates to the fastening of mine workings. The goal is an increase in the strength of the anchor. In rock mass 1 with cracks 2 along a helical line, curved bore-hole 3 is drilled. The helix radius is larger than the diameter of an inny 3. The helix pitch is larger than the average distance between the cracks 2. After the drilling of the hole 3 has finished A straight elastic anchor is inserted. In borehole 3, the anchor is deformed and takes the shape of a helix, acting on a fractured array like a compressed spring, as a result of which the anchor’s unsuitable ability increases. 2 Il.

Description

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The invention relates to the fastening of mine workings, and in particular to methods of anchoring.

 The aim of the invention is to increase the anchoring strength.

FIG. 1 shows a section of a fractured rock mass with a screw hole drilled in it; in fig. 2 is a schematic of the location of a cross section of a hole at different depths from its mouth.

The construction technology of the anchor is as follows.

In the mountain range 1 with trash, inami 2, a curvilinear (screw) hole 3 is drilled, for example, with a diameter of (d) 56 mm. The helix pitch of 0.7 m is taken longer than the average distance between the cracks, 5 m. When drilling, the radius x of the helix in sections A, B, C, D, E, F is controlled. This radius is taken with a larger hole diameter, for example equal to, 60 mm

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(for example, from fiberglass with a diameter of 50 mm) with the help, and the power hydraulic jack is inserted into the curvilinear hole 3 under the action of increasing force.

In the curved hole 3, the linear anchor is deformed and takes the shape of a helix, influences a traverse, a newish massif like a compressed spring, as a result of which the floor increases and the anchor capacity increases.

Claims (1)

Invention Formula The method of erecting an anchor, including drilling a curved hole and introducing a straight elastic anchor into it, characterized in that, in order to increase the anchorage strength of the anchor, the curved hole is drilled along a helical line whose radius is larger than the hole diameter, and the helix pitch take at least After termination of drilling by curvilines - 20, the average distance between the cracks of the rock hole 3 is the linear elastic anchor of the fixed rocks. (for example, from fiberglass with a diameter of 50 mm) with the help, and the power hydraulic jack is inserted into the curvilinear hole 3 under the action of increasing force. In the curved hole 3, the linear anchor is deformed and takes the shape of a helix, influences a traverse, a newish massif like a compressed spring, as a result of which the floor increases and the anchor capacity increases. Invention Formula The method of erecting an anchor, including drilling a curved hole and introducing a straight elastic anchor into it, characterized in that, in order to increase the anchorage strength of the anchor, the curved hole is drilled along a helical line whose radius is larger than the hole diameter, and the helix pitch take at least