The Perma Jack System used for piering a foundation consists of a forty-four (44) pound steel weldment that is placed under the foundation. This type of friction-less piering system is preferred by many structural engineers. Attached to the weldment is a hydraulic cylinder which hydraulically presses three (3) foot sections of steel tubing down into the earth until bedrock or equal load bearing strata is reached. The steel tubing is a round three (3) inch tube made of carbon steel. Each three 3 foot section of pipe is connected by a specially machined fitting designed to align and firmly connect the sections, insuring a continuous steel pier.
At the beginning of each steel pier is a friction-less end which increases the surface bearing to bedrock and also displaces a greater volume of soil as the piering pipe is being driven, resulting in less wall friction during the drive.
Each pier is designed and figured to support 16,000 pounds of the structure and is overloaded for at least thirty (30) minutes under a test load of 32,000 pounds, assuring contact with bedrock. The pier is then locked in place by two three quarter inch locking bolts. The locking is accomplished by a series of drillings with a pilot hole and then a tap size hole for (2) two three quarter (3/4) inch bolts which penetrate the wall of the pipe, locking the Perma Jack bracket and pier in place under the above mentioned load. The driving cylinder is then removed and any excess pipe that would protrude above the ground or floor is cut off. The hole is back-filled and patched, if necessary, completing the Perma Jack System.
Because of the advanced design and simplicity of the Perma Jack System, the lifting operation is performed using the same technique, manpower, and procedure. Although some additional time may be required, these advantages with the Perma Jack System make lifting a normal capability of the Perma Jack System.
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Foundation Repair and Basement Waterproofing in St. Louis and surrounding counties of Missouri and Illinois
1127 Country Stone Dr.
St. Louis, MO 63088
Local telephone: 636-225-2553
Toll free: 1-888-737-6252