Encyclopedia of Anchoring (CA06114E)

ANCHOR TOOLING

Safe, dependable With the horsepower race for installing trucks and Power Installed Screw Anchors (PISA®) increasing with each passing decade, anchor installing tools remain a very important part of the successful anchoring equation. Without the tools to handle the increased torque loads delivered by today’s diggers, power installed anchoring will literally grind to a halt. CHANCE introduced the first PISA® anchor along with the tooling to install it in 1959. This 4,000 ft.-lb. (PISA®4) anchor was followed by CHANCE 5,000 and 7,000 ft.-lb. anchors. The tempo of the anchor race to keep up with the increased capability of diggers and the demand of utilities to anchor in harder soils served as the catalyst for the 1980 CHANCE introduction of the 10,000 ft.-lb. hollow-hub Square One® anchor. For the decade of the ’80s, the Square One® anchor enabled utilities to anchor in soils they could only dream about penetrating with power-installed screw anchors during the previous decade. With digger torque capabilities continuing to increase, CHANCE introduced the *8,000 and 15,000 ft.-lb. Tough One® anchors with high-strength tooling in 1990. Because the installed cost of PISA® anchors is substantially lower than “buried” anchors, and because utilities desire to install power anchors in harder soils, the trend toward heftier anchors and stronger tooling will continue. Digger trucks with 20,000 ft.- lb. of torque capability are not uncommon today.

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Digital torque indicator positioned between Kelly bar adapter and locking dog assembly.

*later increased to 10,000 ft.-lb.

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