Sub Sections: 1 2 3 4 5 6 7 8 9 10 11 12
Pages
: 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200

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/. Add Concrete Construction URL

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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.