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Bracket Performace

Standard-Duty Underpinning Brackets for Helical Pier Foundation Systems

U.S. Patents 5,011,336; 5,120,163; 5,213,448

For use with 1¹/2" and 1³/4" square shaft anchors, as specified below, each bracket is identified by the size stamped on the vertical gusset. Brackets also may be used in conjunction with Uplift-Restraint Bracket (see Bulletin 01-9502).

Bracket comes complete with the hardware required for assembly of bracket; does not include concrete anchor bolts.

The lifting assembly, consisting of the underpinning bracket and jacking tool, is designed to lift with hydraulic jack assist as shown below. However, if jack assist is not available, lifting can be done with the bolts of the bracket. The recommended method is to use a hydraulic jack with a load gauge to avoid exceeding the ratings of the brackets.

Bracket as assembled NOTE: T-pipe crossmember is solid steel bar on Brackets C150-0298 and C150-0299

Standard-Duty Bracket C150-0121, C150-0298 or C150-0299 includes these components

Ordering Information

Bracket Catalog No.	C150-0121		C150-0298		C150-0299
Anchor Shaft Size	11/2" Square Shaft		11/2" Square Shaft		13/4" Square Shaft
SS Anchor Series	Standard SS5	High Strength SS150	Standard SS5	High Strength SS150	SS175
Minimum Bracket Ultimate Strength	40,000 lb.	40,000 lb.	80,000 lb.	80,000 lb.	80,000 lb.
With 2.0 Safety Factor	20,000 lb.	20,000 lb.	40,000 lb.	40,000 lb.	40,000 lb.
Typical Achievable Installed Capacity*	20,000 lb.*	25,000 lb.*	20,000 lb.*	25,000 lb.*	30,000 lb.*

*The capacity of Chance Helical Pier Foundation Systems is a function of many individual elements, including the capacity of the foundation, bracket, anchor shaft, helix plate and bearing stratum, as well as the strength of the foundation-to-bracket connection and the quality of anchor installation. The last row of the table shows typical capacities of the Chance Helical Pier Foundation Systems that are achievable under normal conditions. Achievable capacities could be higher or lower depending on the above factors.

Bracket as applied on foundation footing

Jacking Tool assembled to Bracket (Hydraulic jack not furnished) Jacking Tool C150-0117   Dimensions affecting size of Hydraulic Jack Clearance between two flat washers 43/4" Clearance between bolt couplings 5" Maximum compressed height of jack 11"