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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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JULY
1997
Slurry Displacement Piles
9-32
CALTRANS FOUNDATION MANUAL
that the tip of the concrete placement tube is being maintained a minimum of 10 feet
below the rising head of concrete is for the Contractor to mark intervals of known distance
on the placement tube and to measure the distance from the top of the pile to the rising
head of concrete with a weighted tape measure. If for some reason concrete placement is
interrupted such that the placement tube must be removed from the concrete, the place-
ment tube should be cleaned, capped, and pushed at least 10 feet into the concrete head
before restarting concrete placement. Concrete placement continues in this manner until
the rising head of concrete reaches the top of the pile. Concrete is then wasted until all
traces of particle settlement and drilling slurry contamination are no longer evident. After
this has been achieved, the concrete within 5 feet of the top of the pile is vibrated to consoli-
date the concrete at the top of the pile. Deeper vibration of the pile concrete is not necessary
because concrete with high fluidity self-consolidates under the high hydrostatic pressure
provided.
The contract specifications also require that the Contractor keep a concrete placement log
for the concrete placement operation for each pile. The concrete placement log should
contain information on the pile location, tip elevation, dates of excavation and concrete
placement, quantity of concrete deposited, length and tip elevation of any temporary casing
used, and details of any hole stabilization method that is used. In addition, the log shall
include a graph showing the amount of concrete placed versus the depth of the hole filled.
This means the Contractor must have a way of accurately measuring the volume of
concrete being placed in the pile. For large piles, counting concrete trucks may be suffi-
cient. For small piles, the Contractor may have to use some other means, such as determin-
ing the volume of concrete delivered per pump stroke and counting the number of pump
strokes. Measuring the depth of the hole filled is usually accomplished using a weighted
tape measure to locate the head of concrete within the pile. These readings must be taken at
maximum intervals of 5 feet of pile depth.
The purpose of the concrete placement log is to provide the Engineer and the Contractor
with a record of the concrete placement operation. It can be used to identify potential
problem locations within the pile. Figure 9-18 shows a situation where several hole cave-ins
took place. Using the concrete placement log, the Engineer can determine the approximate
location of potential problem areas within the pile. Pile testing can then be used to deter-
mine whether there is a problem at the suspect area.