Practical Stone Masonry by Hill Peter & David John

Author:Hill, Peter & David, John [Hill, Peter]
Language: eng
Format: epub
ISBN: 9781317762485
Publisher: Taylor and Francis
Published: 2014-02-04T00:00:00+00:00

LIFTING TACKLE

Owing to its weight and unyielding nature, all movement of stone is potentially dangerous to the fingers and toes of the mason. Hoisting stone on a tackle is doubly dangerous. Observing a few simple rules will greatly reduce the risks. Never use any lifting tackle that is not clearly marked with its safe working load (SWL). Always check that the SWL of the tackle is more than the calculated weight of the load. Never use tackle that is damaged in any way or otherwise suspect. Never stand beneath a stone when in the air, and remember that a falling stone may be deflected or roll sideways on landing. Keep well clear. A stone falling from a height of 2 m will hit the ground in ⅕th of a second – there is no time to run. The authors were present when a 5 tonne block slipped from 3 tonne dogs while being unloaded from a lorry. There was no perceptible interval – one moment it was in the air, the next on the ground. This sort of thing should not happen but it can if everyone involved is not always alert.

Where stones of any size are being worked, lifting tackle is essential for transferring the stone from trolley to banker. A simple chain hoist, manually operated, with a capacity of half a tonne is sufficient for most purposes. Ideally the hoist should run on a steel beam, with a hand-operated chain traverse gear for moving it along the beam on its trolley. The push–pull type of trolley is adequate, but considerable effort is needed to move large stones and this can set the stone swinging on the hoist. All parts of the lifting tackle must be installed and checked by a specialist contractor who is competent to issue the necessary safety certificate.

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