Rock Drilling
Purpose
At Africa Blasting Worx , our drill and blast services will
design a project that precisely excavates large amounts of rock at low
production costs. Depending on the blasting method used, a number and pattern
of holes designed by Africa Blasting Worx licensed blasters are drilled into
the rock, which is then filled with explosives.
Process
In trench drilling, the diameter of the blast holes is
normally smaller which provides better distribution of the explosive in the
rock. As a rule of thumb, the hole diameter should be 1/60 of the width of the
trench. If the width of the trench is 2.0 m, the diameter of the hole should be
33 mm. In traditional trench blasting, the middle blast holes are placed in
front of the lateral holes, and all holes are charged with the same amount of
explosives. In smooth wall trench blasting, all holes in each row are in a
line, and the middle holes are heavily charged, while the edge holes have
lighter charges. Combining custom design with industry standard patterns,
Africa Blasting Worx team guarantees to build the perfect drilling pattern for
each blasting project
Trench Blasting & Drilling
Purpose
Trenches are built for pipelines of oil, water, sewage, and
cables. Africa Blasting Worx uses the trench blasting method in a way that
concentrates energy distribution through the rock.
Process
Our trench blasting method uses rounds with a width less
than 4 m, and the diameter of the blast holes is smaller than the diameter of
the rounds. The smaller size of the holes drilled into the rock better
distributes the explosive throughout the rock and avoids contour overbreak
Heavily-populated Areas
When building trenches for road excavation or pipeline
installation in densely populated areas, we take utmost care when drawing plans
for a project’s drilling pattern and blasting sequence. To minimize ground vibrations,
the drill holes are kept as small as possible, typically 30-50 mm in diameter.
To eliminate the risk of fly rock, the blasts are covered with heavy mats made
of logs, rubber, or tires, which are cut into sections and twined together with
steel wires. These mats, around 1 t in weight, absorb energy, and the gases
produced by the blast ventilate through the mats without displacing them
Unpopulated Areas
Our highest priorities when excavating pipelines projects
for oil and gas distribution in unpopulated areas are overall project costs and
time efficiency. Larger blastholes are used to maximize the rock removal of a
detonation sequence
Structural Demolition
Africa Blasting Worx takes a strategic approach to
structural demolition, dismantling buildings in the safest and soundest
possible manner. Starting with a full interior gut of the building, the crews
then move efficiently over each site, simultaneously performing demolition,
sorting building materials and performing any necessary abatement.
