Foundation Specifications 0196

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

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

Artistic Business Community Related Construction Industry Computers Education Relevant Entertainment Health Internet Family Recreation Science Shopping Society

Tiebacks, Tiedowns, and Soil Nails

CALTRANS FOUNDATION MANUAL

General Construction Control

Mill certs should be provided for the steel tendons.

a) Check the steel for damage.

b) Ensure that grease completely fills the free length plastic tube.

c) Securely tape the bottom of the free length.

d) Compare the actual free length dimensions versus the dimension

Double corrosion protection anchors should be completely fabricated before

being delivered to the job site. Bar anchors are installed full length into the

hole. Record the actual free and bond length for each installed anchor.

Tendons shall be equipped with centralizers. These centralizer devices are

absolutely necessary to center the tendon in the hole and to prevent the

tendon from laying on the side of the hole where incomplete grout cover

will cause loss of capacity and future corrosion.

Grout tubes are frequently tied to the tendon before inserting in the hole.

This helps to ensure that there are no voids in the grout.

Testing – check to ensure the tendon is concentrically located in the center

hole jack and load cell before testing begins. Poor alignment of the testing

apparatus will cause eccentric loading on the load cell and jack, which will

give erroneous readings. Deflections at the anchor head should be measured

Soil nailing is a technique used to reinforce and strengthen an existing embankment

(Figure 11-3). The fundamental concept is that soil can be effectively reinforced by install-

ing closely spaced grouted steel bars, or “nails”, into a slope or excavation as construction

proceeds from the top down. The nail bars are not pre-tensioned when they are installed.

They are forced into tension as the ground deforms laterally in response to the loss of

support caused by continued excavation. The grouted nails increase the shear strength of

the overall soil mass and limit displacement during and after excavation. Soil nails are

bonded along their full length and are not constructed with a permanent unbonded length

as are tieback anchors. A typical soil nail is shown in Figure 11-4.