Encyclopedia of Anchoring (CA06114E)

ANCHOR TOOLING

High-Strength Tooling Because of the forces impacting the tooling used to install high-strength PISA® anchors during installation, we have added features to ensure good performance and enhance safety. The Kelly bar adapter and locking dog assemblies both have 7⅝" bolt circles. This compares to 5¼" circles on moderate-strength tooling. The larger circles put less stress on bolts during installation. This helps allow installing torque to reach 15,000 ft.-lb. during demanding installations. If the bolts used to connect the Kelly bar adapter to the torque indicator or locking dog assembly are over torqued, bolts can shear. Our high-strength PISA® tooling has longer sockets on the Kelly bar adapters and locking-dog assemblies. This results in less wrench wobble during installation and reduces stress on bolts. High-strength Kelly bar adapter and locking-dog assemblies are thicker and heavier to give added strength. The anchor-drive wrench is also thicker to give added fatigue life and increased torque strength.

Kelly Bar Adapter

B

Kelly bar adapter and locking dog assembly secured to the digger Kelly bar. Drive wrench is inserted into the locking dog assembly.

Locking Dog Assembly

5 ¼"

5 ¼"Bolt Circle on Standard-Strength Tooling (10,000 ft. lb.)

7 ⅝"

Anchor tooling should not be torqued above its rating. Bolts should be regularly checked for tightness and wear.

7 ⅝" Bolt Circle on High Strength Tooling (15,000 ft. lb.)

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