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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
7-17
Double Acting Steam/Air Hammers
The single acting steam/air hammer employs steam or compressed air to lift the ram. Once
at the top of its stroke, the hammer free falls. With the double acting steam/air hammer, the
hammer employs steam or air to not only lift the piston to the top of its stroke, but also to
accelerate the piston downward. The energy put into the downward stroke by the com-
pressed air or steam is in addition to the gravitational force utilized by the single acting
hammer. Refer to Figure 7-11.
Thus the need for the longer stroke is eliminated with the double acting hammer. It is the
reduction of the required stroke that makes these hammers useful when operating with
limited overhead clearances. The stroke typically ranges from 10 to 20 inches. The blow rate
is more rapid than the single acting hammer, somewhere between 120 and 240 blows per
minute.
Some double acting steam/air hammers are entirely enclosed and can be operated sub-
merged in water.
The rated available energy of the double acting steam/air hammer is calculated by multi-
plying the ram weight times the length of stroke and the effective pressure of the fluid
acting down upon the piston head. With this type hammer it is essential that the hammer is
operating at the manufacturer’s specifications. This requires that the pressure used to drive
the hammer be known and that a table be available depicting rated impact energy to the
operating speed of the hammer. This type of hammer does not use a cushion block between
the ram and the anvil block.
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
Have chart available declaring rated energy vs. operating speed of hammer.