RU2303251C1 - Arrangement for definition of durability of rocks in a massif - Google Patents

Abstract

FIELD: the arrangement for definition of durability of rocks in a massif refers to mining industry and designed for definition of durability of rocks in a massif.

SUBSTANCE: the arrangement for definition of durability of rocks in a massif has a screw oil-rig bar with a cutter, a mechanism of rotation and feeding on the face of a bore-hole having a chuck whose rotation is transmitted with a thrust bushing on a running nut, traveling along the central screw and creating feed of an effort registered with a measuring unit on the cutter. The measuring unit has a dynamometer of high sensitiveness installed in the iron ring with guides. At that the iron ring with rings is fastened with a clamp to the supporting bar. For fixing the arrangement with the massif two parallel tie-rods are applied fastened to the anchors with the aid of locking bolts regulating distance between the supporting bar and the massif.

EFFECT: expands diapason due to possibility to define durability of very soft rocks.

1 dwg

Description

A device for determining the strength of rocks in the array refers to the mining industry and is intended to determine the strength (hardness) in the array.

A device for determining the strength of rocks according to the application No. 94018290, IPC G01N 3/48, E02D 1/00, publication 05/10/1996. It contains a housing in the form of two coaxially arranged rods, movably connected to each other by a sleeve, a spring-loaded striker is placed in one rod, a probe drum is placed in the second rod, a clip is mounted on the end of the second rod, inside of which there is a spring that allows the axial movement of the rod relative to the clip , the penetration depth indicator is made in the form of a rod and a rigid spring mounted on it with a bent end, one rod is rigidly attached to the protrusion of the holder, and the other end of the rod is freely uschen rack through the opening, for measuring the quantity of introduction of the indenter into the formation using a ruler with a vernier fixed on a holder, platoon trigger mechanism and cocking lever includes a trigger. The disadvantage of this device is the limited application for very weak and weak breeds.

Known device A. N. Kulbachnogo (Mechanical properties of rocks. Collection of articles. - M .: IGD Academy of Sciences of the USSR, 1959. - p. 35-40), consisting of a cartridge having an end hole for screwing a drill rod with a cutter, a thrust pipe , on the opposite end from the bottom, the screw nut is screwed, a lead screw passed through the lead nut into the thrust pipe, a clamp and a mass dose. In mine conditions, the device is installed and fixed directly in the hole in which the measurement is made. The disadvantage of this device is the inability to determine the strength in very weak and weak rocks.

The technical result is to expand the range due to the possibility of determining the strength in very weak and weak rocks (ores).

The technical result is achieved by the fact that in the device for determining the strength of rocks in the array, including a helical drill rod with a cutter, a rotation mechanism and a hole for feeding a hole containing a cartridge, the rotation of which is transmitted by the thrust sleeve to the driving nut moving along the central screw, and creating a force supply to the cutter recorded by the measuring unit, according to the invention, the measuring unit includes a high sensitivity dynamometer mounted in a holder with guides, and the holder with guides repitsya clamp to the support beam, wherein for fastening the device with an array of two parallel rods are used, attached to anchors locking bolts, regulating the distance from the reference beam to the array.

The device is illustrated in the drawing, which shows a General view in a horizontal plane.

The device comprises a helical drill rod 1 of a standard rhombic section, equipped with a cutter, for example, with a diameter of 40 mm, manually rotated by means of a rotation and feeding mechanism, including a cartridge 2, having openings for the winch. The rotation of the cartridge 2 is transmitted by the thrust sleeve 3 to the driving nut 4, which at the same time moves along the central screw 5 and creates a feed force to the cutter. The magnitude of the feed force and the thickness of the ore layer cut by the cutter depends on the thread pitch in a pair of "running nut - central screw" (1 ÷ 3 mm). The feed force is transmitted by the central screw 5 to the measuring unit, which consists of a high sensitivity dynamometer 6, which is installed in the holder 7 with the guides 8. A key prevents rotation of the central screw 5 relative to the holder, while freedom of movement of the screw in the holder along the device axis is maintained. The holder 7 with guides 8 is fastened with a clamp 9 to the support beam 10. To fix the device with the array, two parallel rods 11 are used, attached to the anchors 12 with locking bolts 13. The distance from the supporting beam to the array is adjustable in a wide range of locking bolts 14, which allows measurements at different distances from the output circuit. Anchors are fixed in bore holes by blocking in wooden corks 15.

Preparation of the device for testing begins with drilling the central test hole to a depth at which it is planned to determine the strength of the array, and two holes with a depth of 0.5 ÷ 0.7 m under anchor 12, at a distance of, for example, 0.25 m from the central one. After the anchors are driven in, rods 11 with a support beam 10 are mounted on them, on which a dynamometer 6 of high sensitivity, a rotation and feeding mechanism of the rod and a helical drill rod 1 of the corresponding length are fixed. Drilling continues until the axial force is stabilized (usually up to 8 cutter revolutions). The axial force ρ is measured by a dynamometer 6 of high sensitivity. The strength of the rock (ore) in the array is determined by the well-known formula:

f≅0.005

Thanks to this design, the device allows you to expand the range of measured values of the strength of rocks (ores) in the array, as well as in the simple and reliable fastening of the device to rock (ore) exposure in very weak and weak rocks.

Claims (1)

A device for determining the strength of rocks in the array, including a helical drill rod with a cutter, a rotation mechanism and a borehole feed mechanism containing a cartridge, the rotation of which is transmitted by the thrust sleeve to the driving nut moving along the central screw and creating a feed force to the cutter recorded by the measuring unit, characterized in that the measuring unit includes a dynamometer of high sensitivity mounted in a holder with guides, and the holder with guides is secured with a clamp to the support beam, while for fastening device with an array of two parallel rods are used, attached to anchors locking bolts, regulating the distance from the reference beam to the array.