RU2311534C2 - Device to measure mine wall deformation by slot unloading method - Google Patents

Abstract

FIELD: geomechanics, particularly to control rock stresses and deformations.

SUBSTANCE: device comprises template for slot drilling-out, spacing and supporting wedges arranged in extreme template orifices and transversal member with two orifices adapted to receive two removable mine survey plugs. Each mine survey plug is made as two split metal wedges. One metal wedge has polished socket formed in side part thereof and adapted to receive mercer clock gauge stem. Longitudinal row of convex segments is created in inner side of one metal wedge. Inner side of another metal wedge has spherical stop made as ball, spring and threaded plug.

EFFECT: increased operational reliability, decreased labor inputs and measuring accuracy.

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Description

The invention relates to geomechanics, is intended for measuring strains on the walls of mine workings, followed by calculation of the principal stresses acting in the rock mass.

A device is known for measuring deformations on the walls of a mine working by the method of slotted unloading, including a template for drilling a slot with holes for benchmarks, a benchmark of a removable collet type having a polished socket for a dial indicator rod on the side of the outside, the rock deformation is determined by the difference in counts on the dial indicator on the slit (Improving the method of slotted unloading / Vlokh N.P., Zubkov A.V., Feklistov Yu.G. // Diagnostics of the state of rock massifs: Collection of tr. - Novosibirsk: IGD SB AN SSSR, 1980, - p.30 -35).

The disadvantage of the device is its complexity, as well as the unreliability of the drilling tool with a diameter of 0.02 m

The closest to the invention in terms of technical essence and the achieved effect is a device for measuring deformations on the walls of a mine working by the slit discharge method, including a template for drilling holes with holes for a benchmark, a removable collet-type benchmark with a polished dial indicator socket on the side of the outside (Vloch NP Management of mountain pressure in underground mines. The method of slotted unloading. - M., 1994, - p.27-28 (prototype).

The disadvantage of this device is that the textolite collets burst due to the metal wedge in the bore holes and when drilling the central holes of the slot, vibration (stress) of the textolite collets occurs, which leads to inaccurate measurements.

The objective of the invention is to increase the reliability, reduce the complexity and increase the accuracy of the measurement.

The technical result is achieved by the fact that in the device for measuring deformations on the walls of a mine working by a slit discharge method containing a template with holes for drilling holes, spacer-supporting wedges and a cross-section with two holes in which two removable frames are placed in the extreme holes of the template of which is made in the form of two detachable metal wedges, and one of them has a polished socket on the side for the dial indicator rod, characterized in that on the inside ONET polished metal wedge socket on the side of the outer part of the longitudinal track applied concave segments, and on the inner side of the second metal wedge mounted ball retainer formed as a ball, a spring and a threaded plug.

This design of the device for measuring deformations on the walls of the mine working by the method of slotted unloading allows you to create reliability, significant improvement in ways to reduce the complexity and improve the accuracy of measurement.

Figure 1 - General view of a device for measuring deformation on the walls of a mine working by the method of slotted unloading; figure 2 shows a removable benchmark, made in the form of two detachable metal wedges, a longitudinal section; figure 3 is a section aa of figure 2.

A device for measuring deformations on the walls of a mine working by the method of slit unloading, containing a template with holes for drilling holes 1, placed in the extreme holes of the template, spacer-supporting wedges 8 and a cross with two holes 2, in which two removable frames 3 are placed, each of which is made in the form of two detachable metal wedges 4 and 5, and one of them 4 has a polished socket 6 on the side for the dial indicator rod 7, on the inside of the metal wedge 4 with a polished socket 6 on the outer part of the casing is coated with a longitudinal track of concave segments 9, and on the inner side of the second metal wedge 5 there is a ball stopper 10 made in the form of a ball 11, spring 12 and screw plug 13.

A device for measuring strain on the walls of a mine is used as follows. Set the template 1 on the wall of the excavation, then drill two holes through the extreme holes of the template in which, using the spacer-supporting wedges 8, fix the template 1 on the wall of the excavation. Then, two holes are drilled through the holes in the cross member 2 for removable frames 3, each of which is made in the form of two detachable metal wedges 4 and 5, one half 4 of the metal wedge is inserted, which has a polished socket 6 on the side for the dial indicator 7, on the inner side of the metal wedge 4 with a polished socket 6, a longitudinal track of the concave segments 9 is applied on the lateral outer part, and the other half 5 is spreaded, sending it until you hear audible clicks, i.e. On the inner side of the second metal wedge 5, a ball stop 10 is installed, made in the form of a ball 11, a spring 12 and a threaded plug 13. When sending a benchmark, the ball 11 passes from one concave segment to another longitudinal track of the concave segments 9, the spring 12 is compressed and the ball 11 is immersed , passing the elevations of the concave segments on the longitudinal track of the concave segments 9, the spring 12 abruptly pushes the ball 11, thereby clicking, i.e. the ball 11 occupies a retaining position in the longitudinal track of the concave segments 9 under the action of an elastic spring 12 with a supported threaded plug 13. They form a “lock”, i.e. the removable benchmark 3 is wedged between the wall of the hole and the inserted two split wedges. Using indicator 7, strain measurements are made before drilling the discharge gap.

Then, a template 1 is left on the working wall, secured with spacer-supporting wedges 8, the cross member 2 is removed from the reference points 3 with the indicator 7 installed in the slots 6. An unloading slot is drilled through the holes of the template 1, the cross member 2 with the indicator 7 on the reference points 3 is installed and subsequent measurement is performed .

The difference in counts by indicator 7 determines the deformation of the rocks on the discharge gap.

The use of the invention in comparison with the prototype allows to increase the reliability of the removable benchmark, consisting of two detachable metal wedges, and to provide significant improvements in ways to reduce the complexity and improve the accuracy of measurement.

Claims (1)

A device for measuring deformations on the walls of a mine working by the method of slit unloading, containing a template with holes for drilling holes located in the extreme holes of the template, spacer support wedges and a cross with two holes in which two removable frames are placed, each of which is made in the form of two detachable metal wedges, and one of them has a polished socket on the side for the dial indicator rod, characterized in that on the inside of the metal wedge with polished house on the lateral outer portion affixed concave longitudinal track segments, and on the inner side of the second metal wedge mounted ball retainer formed as a ball, a spring and a threaded plug.

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