Institute of mining named D.A.KUNAEV together with the "ZHEZPROM" corporation propose а metal-rubber anchor for attachment of mine working .

1. Advantages which is reducing a level of risk of a traumatism:
· Is installed by a drill carriage by a principle " bored - put ". There is no necessity to the borer to bore many of blastholes and to be in a dangerous zone;
· From the moment of the installation the anchor gains pull up to 4 - 5 tons and can perceive full dead load on the average up to 12 tons. (lag of the installation of attachment from operate face up to 1 m, there is no time of a set of strength);
· Aseismic (does not reduce lift capability from effect of blastings);
· Impact-dumping (reduces effect of a rock bump at the expense of amortization properties of the lock of the anchor);
· The yielding characteristic promotes dispersion of load between anchors and eliminates a capability of breakaway of an anchor with quake of a roof;
· The quality control of the installation of an anchor by a tapping by a crow-bar (hard state of the head of a rod indicates, that the anchor has pull).

2. Advantage of technology:
· After the installation of an anchor it is possible at once to make blastings (the time for concrete hardening is excluded);
· The roof-bolt setting by drill carriages is engine driven;
· The productivity of the installation of attachment increases in 2 times;
· The volume of delivery of materials in operating face is reduced in 4 times;
· The repair of attachment is simplified;
· The manpowers of attachment 100m of drift on 14 man-hour are reduced;
· The reuse of anchors is possible;
· Usage of anchors in gentle rocks is possible.

3. Advantage on geomechanical conditions:
· At deformation of a massif the anchor does not reduce lift capability, i.e. adapts;
· With increasing of load at deformation of a massif the lock of an anchor enters in a mode of self-jamming, his lift capability increases and simultaneously disperses between all anchors.

4. Conditions, when applying a metal-rubber anchors is necessary:
· Wet roof;
· Rocks get soaked at presence of a moisture;
· Fissured rocks;
· Rock-bump hazardous sites;
· Speedy drivage;
· Influencing of a large volume of blastings on quality of attachment.

The realization stage.

The designed technology of a roof support by metal-rubber anchors is protected by the patents of Republic of Kazakhstan and Russia. The manufacturing of a roof bolting is mastered by the "ZHEZPROM" corporation city Dzhezkazgan and in Institute of mining named D.A.KUNAEV city Almaty. The using on ore mines of Kazakhstan has been started.
The cost of attachment 1m? of a roof does not exceed the cost of concrete attachment.

The development of production of metal-rubber anchors on your firm against the license agreement concluded with the authors of mining is possible. The authors of mining:

The candidate of engineering science Nikujko E.S.

The address e-mail: mranchor@mail.ru