Rock Anchor

An anchor resists forces by means of corrosion protected steel bars embedded into bedrock. Structures need an anchor to counteract the uplift and other forces acting on foundations. The threaded bar is bonded to the bedrock socket wall or virgin soil with by using high-strength grout.

After an anchor is constructed, the free-length is then tensioned, but bolts are grouted the full length of the bar and cannot be tensioned.

A rock anchor or rock bolt can have very high load capacities. Rembco has installed many different sizes. The largest could hold up to 1,000 kips.


Anchor:
Secure caisson bottom against uplift
Stabilize slopes and walls
Provide tiebacks for bridges
Increase stability of dams
Tension load tests

Bolt:
Secure surfaces in mines
Holds buildings against lift
Stabilization of slopes
Bases for guy line toggles 

Installation Sequence
 
1. Casing advanced as hole is drilled with a downhole hammer system.

2. The drill pipe is removed leaving the steel casing sitting at bottom of socket.

3. Threaded tension bar lowered into the bedrock socket.

4. Grout pumped into the socket to bond walls to rock anchor.

5. The casing lifted to mouth of rock socket to allow bonding.

6. Plates installed on top of epoxy coated bars for loading the tendon.

7. Anchor is post-tensioned and locked off to maintain the tension.
 

Installing in Caisson Bottom © 1998 - 2008 Rembco Geotechnical Contractors