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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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Tiebacks, Tiedowns, and Soil Nails
JULY
1997
11-3
In addition to allowing higher wall designs, tiebacks serve another useful purpose. The only
part of the system that projects beyond the wall into the excavation is the relatively small
anchoring device. Hence, the system provides an open unrestricted work area in the
excavation.
Tieback shoring designs require sophisticated engineering techniques and the calculations
submitted by contractors and consultants can therefore be very complex.
For permanent structures, the Contractor is responsible for providing the tieback system
which conforms to the design requirements shown on the plans and the testing require-
ments specified in the contract documents. The Contractor has the option of choosing
which system will be installed. The record of readings from the Performance and Proof tests
shall be documented by the Contractor and provided to the Engineer.
A Tieback Technical Specialist is available for consultation and is located in the Office of
Structure Construction in Sacramento. In addition, the Staff Specialist for Earth Retaining
Systems in the Office of Structure Design in Sacramento can be helpful in answering any
questions that may arise.
Specifications for tieback anchors are generally found in the contract Special Provisions.
Tieback anchors shall be installed in accordance with the manufacturer’s recommenda-
tions. In case of a con.ict between the manufacturer’s recommendations and the Special
Provisions, the Special Provisions shall prevail.
Sequence of Construction
Sequence of tieback construction is as follows:
SEQUENCE
DESCRIPTION
1
Drill the holes the required length and diameter.
2
Install the prestressing strands or bar.
3
Place primary grout.
4
Complete Performance and Proof Tests (refer to section on testing later in
this chapter).
5
Lock-off and stress.
6
Place secondary grout.
Note: Each step must comply with the contract specifications before proceeding to the next
step.