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Закрити книгу / close this bookSpecial Public Works Programmes - SPWP - Stone Paving-Blocks - Quarrying, Cutting and Dressing (ILO, UNDP; 1992; 60 pages)
Перегляд документу / View the documentIntroduction
Вiдкрити папку i переглянути змiст / Open this folder and view contents1. The quarry
Закрити папку / close this folder2. QUARRYING
Перегляд документу / View the documentQuarrying methods
Перегляд документу / View the documentQuarrying using a crowbar
Перегляд документу / View the documentChannelling
Перегляд документу / View the documentMaking wedge-holes
Перегляд документу / View the documentQuarry wedges
Перегляд документу / View the documentCutting a block with wedges and a sledgehammer
Перегляд документу / View the documentPlug and feathers
Перегляд документу / View the documentQuarry equipment and tools
Перегляд документу / View the documentUse of explosives in stone quarrying
Перегляд документу / View the documentBlock-splitting using black powder
Перегляд документу / View the documentCalmmite
Вiдкрити папку i переглянути змiст / Open this folder and view contents3. HANDLING THE BLOCKS
Вiдкрити папку i переглянути змiст / Open this folder and view contents4. SECONDARY CUTTING AND DRESSING
Вiдкрити папку i переглянути змiст / Open this folder and view contents5. STORING AND TRANSPORTING STONE PAVING BLOCKS
Перегляд документу / View the documentBack Cover
 

Quarrying methods

Once the quarry has been sited, the environmental restoration plan agreed, and the preliminary clearing work completed, the method of quarrying the rock is chosen.

Depending on the type of deposit encountered, whether granite in the form of boulders or in benches from several centimetres to several metres high, the quarrying method chosen will involve the use of a crowbar, quarrying wedges, plugs and feathers, explosives or calmmite (1) to detach blocks of rock from the solid rock mass.

(1) See page 25

Primary cutting is the process by which a fracture is created in the rock mass to detach a block, or in a block of rock to cleave it, by successive breaks, into blocks of manageable dimensions.

The size to which blocks must be cut will thus be determined by the handling system used. In determining a block's dimensions, it is important to relate it to the size of the finished product (paving-blocks or curbstones) which will be made from the block.

If pavement curbstones 100 cm long and with a 20 × 20 cm section are to be produced, one should obtain an initial block of multiple dimensions to those of the curbstones/edging blocks (adding a small margin to allow for material lost in dressing).

For example, after the first cutting stage, the block could measure 105 × 63 × 42 or 105 × 85 × 21 cm.

Granite block from which curbstones measuring 100 × 20 × 20 cm are to be produced.

It will be possible to cut six curbstones from this block with a minimum of waste.

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