Darda ROCK SPLITTERS
Main Darda Rock Splitters
Application Reports Index
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| Application Report - Block quarrying in the Natural
Stone Industry |
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Granite - hydraulic
splitters replace gunpowder
The Job:
At a quarry in Japan, white granite is quarried.
Big blocks have to be broken out of the rock faces.
The requirements:
Before the Darda method was introduced, the sides
of the block were separated from the rock with thermal lances, after
which the base was blasted free with gunpowder. This process produced
blocks measuring
6 m x 6 m, which were then broken down into as many as eight smaller
blocks, again with gunpowder. This method, however, entailed a number
of major disadvantages, i.e.:
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It took three whole days to separate only one
side of a block from the rock with a thermal lance. |
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The lance method was far too heavy on fuel. |
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The workers took a whole day to drill the holes
for blasting a single block and another half-day to install
the charges. |
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Blasting with gunpowder was extremely dangerous. |
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Hairline cracks frequently occurred, rendering
the blocks unusable. |
The solution:
Two hydraulic rock and concrete splitters split
granite blocks measuring 6 m long, 4-6 m high and 6 m wide. Each machine
consists of four C 11 SL splitting cylinders, which are operated simultaneously,
thereby developing a combined splitting force of over 1500 tons. In
addition, the course of the split can be determined precisely in advance,
the result being a dimensionally accurate granite block.
Following conversion to Darda splitters, the following advantages
rapidly became evident:
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The drill-holes required to split a block were
completed in only one hour. |
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The splitters split out a granite block in only
twenty minutes. |
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The entire operation was considerably more productive.
Many more blocks could be produced in less time. |
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Hazardous situations became a thing of the past. |
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Waste was virtually eliminated. |
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