SU684142A1 - Method of exacavating roof-supporting ore pillars - Google Patents

Description

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The invention relates to the mining industry and can be used in the excavation of supporting pillars left after mining of low-ore ore bodies of the hollow and oblique incidence of the chamber-pillar or splash development systems.

There is a method of extracting supporting pillars, including pre-filling the developed space of a mortgage with the subsequent extraction of pillars 1.

The disadvantage is the high cost of filling works.

There is also a method of excavation support) dikh ore pillars, including their drilling, the subsequent destruction of the pillars on the border with the collapsed rocks and the delivery of broken ore to the haulage drift 2.

The known method is characterized by relatively low efficiency, excavation of supporting pillars.

The aim of the invention is to increase the efficiency of the excavation of the pillars by increasing the completeness of their excavation and increasing the safety of work.

The goal is achieved by the fact that the roof of the waste block is drilled between the previously collapsed

and unbroken rows of pillars with simultaneous drilling of the latter, then short coats; -; einos blow up an ooura, a new roof and a row of pillars ahead of them; repulsed ore pslnost cleaned under the protection of the newly formed rivif, - VOY band.

Fig, 1 shows a diagram of working out tsalikov block in the plan; FIG. 2 is a section A-A of FIG. 1;

At the beginning, chambers are stripped in the chambers and all the supporting ore pillars 1 are drilled in the block using holes 2. Simultaneously with drilling the pillars 1, drilling from the ventilation drift 3 and sweeping the block 4 of the borehole 5 in the roof of the chamber with the receiving pipe after the explosion of rubble strips of the roof support bind. The rubble strips 6 can also be obtained by blasting wells 7 drilled from neighboring chambers.

The optimal arrangement of wells in the roof of the chamber in order to form rubble strips is determined under industrial conditions. After drilling the ore pillars and wells in the roof, one row of wells 5 and 7 and one row (in dip) of ore pillars 1 are blown up at one time (using short-delay electric detonators).

The wells that were blown up in the first place along the rock 5 or 7 form a rubble strip in the fall, and then with a slowdown of several milliseconds, holes 2 in the supporting (ore) pillars 1 explode.

The time delay of short-delay electric detonators is chosen so that when the blast holes in the supporting ore pillars explode, the ore is thrown to the next row of ore pillars by the blast wave from the blast hole in the ceiling to form a rubble strip. Thus, the broken ore will not be mixed with rock in the rubble strip.

Repulsed ore 8 is delivered by loading equipment with a remote control, such as a bulldozer 9, to loading shelves 10 mounted on an anchorage track L1.

Further, the ore is loaded into the haulage vessels and is discharged onto the mountain. Sub-pillars 12 are discarded when the ventilation drift 3 is redeemed.

The invention makes it possible to completely work out all the supporting pillars without employing a laborious and expensive operation to fill the voids of the spent chambers with concrete, since in our case the roof is supported by rubble strips.

The use of remote-controlled bulldozers for the delivery of ore will significantly improve the safety of work, as the delivery of ore to the haulage roadway will be carried out without the presence of people in the chamber.

Claims (2)

1. The handbook on the general case with t. III, Podzekie work, Gosgortekhizdat 1961, C 10, 24, 25. 2. USSR Author's Certificate for Application No. 2531268, cl. E 21 C 41/06, 1977. ZhuU .: t: g Y: -; l;: h- /; y- l; l , .-: t.,: x .., - :. ::., ..- l: .У: - JШJJZJ Rig 2