Mine Roof Support Anchors

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Mine roof support anchors.

Non tensioned cables post tensioned cables tensionable cables for primary roof support and fully grouted cables. Principal support is where rockbolts provide the support even where they are used in conjunction with supplementary support. Our market leading product is called the pre stressed cable anchor traditionally used for secondary support in the haulages stations and large chambers of the underground mines. Rockbolt is a bar inserted into the roof or side of a roadway which is used in.

In more recent times m and j mining and anglo platinum have led the way by introducing cable anchors to the primary support environment of the stopes and panels. Jennmar offers an industry leading line of cable products including. Coal mines as early as 1905 1. There is also an expansion anchor threadingly engaged about the threaded shaft for anchoring against the rock within a bore hole and means for bearing against the rock at the opening of the bore hole.

These products are based on 7 strand high strength cable. The suitibility of the rock anchor zone and specific mine roof support anchor to be used is best determined by actual testing at the mine site. People appointed to the mine management structure under regulation 10 of masham. Wedge malleable.

Jennmar offers a complete line of cable support products. Iron and steel are used in mines in the form of rigid and yielding props beams and girders reinforcement in concrete corrugated sheets and roof floor bolts. A wide variety of anchor mine roof support bolt options are available to you such as type standard. Mine roof support anchor 2 leaf bail type assembly data.

A rigid props and b yielding props. In order to cope with the increasing use of roof bolts efforts should be made to maximize the safety and minimize the cost. The present invention is a mining support for supporting rock within a mine. About 26 of these are bolts 19 are anchors.

Section or heavier greatly reduces fire risk in mines. 3 4 unc 1 1 2 3 3 1 8 p 30 000 5 8 unc 1 1 2 3 3 1 8 p 22 500 frazer jones company technical data sheet d6 thread size drill hole size in shell length in wedge length in wedge pearlitic p or malleable m non seizure load lbs composition. Iron steel for mine supports. The support includes a cable and a threaded shaft fixedly attached to a first end of the cable.

Discussed rails of 36 lbs. History of rock bolting suspension type roof supports were used in u s. With continuing investigations and developments roof bolting today can in most cases successfully reinforce the mine roof in underground mining. In 1936 a new system 2 of providing reinforcement to mine roofs with rock bolts was developed at the leadwood lead mine st.

Mine roof support anchors require competent rock strata in the anchor zone.