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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
7-33
Why do we use the ENR formula in the field.
1. Simplicity – Relatively short calculation needed for determination.
2. Simplicity – Certain factors in other formulas are subjective in nature and could be
difficult to determine.
3. Simplicity – Subjective evaluations required by other formulas could precipitate
contractual problems.
4. Dependability – Over the years, our experience with the ENR formula has been good.
It must be remembered that driving formulas are simply tools used to aid the evaluation of
a pile’s capacity. Experience and engineering judgment are of immense value in this work.
Field measurements of bearing capacity on large displacement piles, in excess of 100 Tons,
have shown that the ENR formula is not necessarily reliable. It is believed that a significant
amount of the driving energy is being used just to get the large pile mass moving.
Although the Standard Specifications do require the use of the ENR equation, research is
showing that the use of the wave equation analysis provides a more reliable correlation to
static pile load test results than does the ENR formula. The enhanced accuracy is achieved
by providing a more detailed accounting of energy losses.
Dynamic Analysis by Wave Equation
Wave equation analysis of a pile driving operation is a one dimensional finite difference
method which models the transmission of a hammer’s impact wave down a pile and into
the soil. The method has been around for more than two decades. Several versions of the
program are available, some of which can be run on a personal computer. One of the most
widely known versions is called Wave Equation Analysis of Piles (WEAP).
What a wave equation analysis does is model the pile and the driving system as a series of
masses and springs. The relative sizes of the springs and masses depends on the actual pile
and driving system characteristics. The soil is represented by a series of elastic plastic
springs and linear dashpots. After modeling the pile, the driving system and the soil, the
ram elements are given a velocity equal to the hammer impact velocity and a dynamic
analysis is performed.
The wave type analysis is relatively new to Caltrans. To date it has varying uses. Among
them are: (1) Driveability Study, (2) Hammer Acceptance Study, and (3) Acceptance Curves.