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The enclosed #2 Headframe (left) and the Hoist House (right) of the Quincy Mine. Concrete headframes require less maintenance and are less susceptible to corrosion than steel headframes. There is much less waste of concrete during construction of a concrete headframe than there is of steel in construction of a steel headframe.
An A-frame is a basic structure designed to bear a load in a lightweight economical manner. The simplest form of an A-frame is two similarly sized beams , arranged in an angle of 45 degrees or less, attached at the top, like an uppercase letter 'A'.
A drum hoist (steel wire rope visible) and motor. In underground mining a hoist or winder [1] is used to raise and lower conveyances within the mine shaft.Modern hoists are normally powered using electric motors, historically with direct current drives utilizing Ward Leonard control machines and later solid-state converters (), although modern large hoists use alternating current drives that ...
1600 ton maximum lift capacity sheerleg Taklift 7 of Smit International. Fixed shear legs are most commonly found on floating cranes known as floating sheerlegs.These have heavy A-frame booms and vary in lifting capacity between 50 and 4,000 tons, and are used principally in shipbuilding, other large scale fabrication, cargo management, and salvage operations.
A historic photograph of an A-frame sod roof house in the Netherlands. Image: Cultural Heritage Agency of the Netherlands 20309407 - RCE. An A-frame building is an architectural style [1] of building that features steeply-angled sides (roofline) that usually begin at or near the foundation line, and meet at the top in the shape of the letter A ...
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