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Micro Piles |
Pressure Grouting |
Rock Anchors |
Permeation Grouting
Soil Nailing |
Compaction Grouting |
Micropiles |
Injection Grouting |
Chemical Grouting
Our
techniques apply when adding new structures:
especially
rock anchor,
microfine cement,
soil nailing,
micropile
installations for
foundation support.
We
specialize in
slope stabilization,
anchors,
permeation grouting,
foundation repair
and support,
grouting,
soil nails,
rock drilling,
micropile installations, and
sinkholes. We
use a
problem-solving approach geotechnical
architecture of buildings, bridges,
water plants, sewage plants, tunnels,
sinkholes,
caisson,
shoring,
underpinning,
agriculture, and
roads
construction. We
are experienced in these applications:
micro piles,
sinkhole repair,
permeation grouting, pressure
grout,
soil nails,
chemical grouting,
micropiles,
compaction grout, and
rock anchors.
Our specialties are
rock anchor,
acrylamide and
compaction grouting,
mini piles,
sinkhole repair,
micropiles,
acrylamide grouting, and
soil nailing.
We will continue to dedicate ourselves to
excellence,
including
insurance mortgage, in our performance, in our
integrity, and in our relationships with our
customers. We will carefully weigh our
decisions, actions, and results to make sure
that we remain the most trusted name in the
geotechnical contracting industry. Please
visit our website
http://www.rembco.com/.
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Driven Piles
JULY
1997
CALTRANS FOUNDATION MANUAL
7-25
The Double Acting Diesel Hammer. The double acting diesel hammer is similar in
its operations to other double acting hammers. The downward stroke is not just a function
of gravity. The top of the cylinder is capped. As the ram nears the top of its upward stroke,
the air is compressed in a “bounce chamber”, which halts the upward flight of the ram.
The downstroke energy is a function of both gravity and the internal pressure generated in
the bounce chamber. The stroke of these hammers is around 3 to 4 feet and they operate at
a much higher speed as compared to the single acting diesel hammer. Refer to Figure 7-15.
These hammers normally have a manually operated variable fuel injector, which is
controlled by the crane operator. Unless the control is wide open, the energy delivered is of
unknown quantity.
The rated energy of a closed end diesel hammer is computed from a formula incorporating
the length of the free fall downstroke of the ram times the sum of its weight and changes in
pressures and volumes of air in the bounce/scavenging chambers of the hammer.
Manufacturers have plotted the solutions to the formulae for each model of hammer for
various pressure readings in the bounce chamber.
The Engineer should:
NO.
ITEM DESCRIPTION
1
Have the manufacturer's current specifications for the type and model of
hammer being used.
2
Ensure all required parts of the hammer are intact and in good operating
condition.
3
Ensure the energy chart made available by the manufacturer is the correct
one for the model of hammer being used and that there has been a recent
calibration or certification of the bounce chamber gauge.