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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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Static Pile Load Testing and Dynamic Pile Monitoring
JULY
1997
8-3
The static pile load tests are made using a reaction method. The test procedure involves
applying an axial load to the top of the test pile with the use of one or more hydraulic jacks.
The reaction force is provided by subjecting the anchor piles to tension, in the case of a
static load test in compression; or by subjecting the anchor piles to compression, in the case
of a static load test in tension. Various forms of instrumentation are installed onto the test
and anchor piles to measure the displacement of the test pile. Redundant systems are used
to ensure accuracy of the various measurements.
A five-pile test group (four anchor piles and one test pile) is used for all static load tests in
compression and for most tension tests (Refer to Appendix F). Occasionally, a three-pile test
group (two anchor piles and one test pile) is used for static load tests in tension (Refer to
Appendix F).
Loads are applied in increments usually equal to 10% of the design load. Each increment of
load is held for a predetermined time interval. The load increments are applied until the
load causes the pile to “plunge”, or up to the point where the capacity of the testing system
is reached. The “plunge” point is where little or no additional load is needed to cause the
pile to displace.
The Foundation Testing and Instrumentation Section work crews have reaction trusses for
static load testing up to 2,000 Tons.
In general, a pile is considered to have failed when the total displacement exceeds
1
/
2
inch
under load. An acceptable pile is one that reaches double the design load without exceeding
the maximum displacement.
The purpose of a Static Pile Load Test is to cause a failure along the soil/pile interface. This
failure generally occurs well before the structural capacity of the pile is reached. Once the
test is complete, the pile is returned to a no-load condition and can be incorporated into the
foundation of a structure. The only permanent effect of the pile load test is the downward
displacement of the test pile. The same effect would be achieved if a pile hammer drove the
pile the additional distance.
Once the pile load testing is completed, personnel from the Foundation Testing and
Instrumentation Section compile and review the load test data. The test data is used to
produce a plot of load versus pile displacement. The ultimate capacity of the test pile is
determined using graphical or analytical procedures. A summary report is then forwarded
to the Structure Representative, along with any recommended changes or modifications, if
necessary.