Roof Bolts Definition

Mcgraw hill dictionary of scientific technical terms 6e copyright 2003 by the mcgraw hill companies inc.

Roof bolts definition.

A long steel bolt inserted into walls or roof of underground excavations to strengthen the pinning of rock strata. They also drill bolt holes into roofs at specified distances from ribs or adjacent bolts. Rock bolts were first used in mining in the 1890s with systematic use documented at the st joseph lead mine in the u s. Anchor points are usually installed on the roof and are used to connect lanyards lifelines and other forms of tie off which prevent a worker from falling.

It is inserted in a drilled hole and anchored by means of a mechanical expansion shell that grips the surrounding rock at about 4 ft 1 m spacing and pins steel beams to the roof. Rock bolt in tunneling and underground mining steel rod inserted in a hole drilled into the roof or walls of a rock formation to provide support to the roof or sides of the cavity. Rüf bōlt mining engineering one of the long steel bolts driven into walls or roofs of underground excavations to strengthen the pinning of rock strata. Anchor points are a vital part of a fall protection system.

Roof bolts are inherently more effective than the wood timbers they replaced. Roof bolts promised to dramatically reduce the number of roof fall accidents which then claimed hundreds of lives each year and they were initially hailed as one of the great social advances of our time roof bolting also emerged at a time of rapid technologic. Roof anchors can be as simple as a d ring connection or as complex as a complete lifeline system. A rock bolt is a long anchor bolt for stabilizing rock excavations which may be used in tunnels or rock cuts it transfers load from the unstable exterior to the confined and much stronger interior of the rock mass.

Job description mining roof bolters operate machinery to install roof support bolts in underground mine. In architecture structural engineering or building a purlin or historically purline purloyne purling perling is a horizontal beam or bar used for structural support in buildings most commonly in a roof. Rock bolt reinforcement can be used in any excavation geometry is simple and quick to apply and is relatively.