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Excavation

Boulder

Secondary breaking of large boulder with multiple free-face (Semi-hard rock)


Drilled Hole Diam .40 mm. Hole Lenght 80% of the height Cex Broke Used 5,4 Kg/m3

Secondary breaking of boulder in underground (hard rock)


Drilled Hole Diam. 40 mm Hole Lenght 80% of the height. Cex Broke Used 10º Kg/m3

Ditch excavation

The proper angle of drilled hole is 60º or less. After the breaking of the cut part, load and break the part tobe widened.


Drilled Hole Diam. 40 mm. Cex Broke Used 42 Kg/m3.
Bench cutting

For breaking a prescribed height of rock, itis necessary to drill a hole 5% deeper than the heiight required to be broken. For wide bench first break (a), and 6-12 hours late load (b) Cex Broke.


Drilled hole Diam. 40 mm. Cex Broke used 5 Kg/m3.

In breaking a prescribed height of rock, better result can be obtained by drylling a hole horizontally to the bench of bottom.