Products and Services
The steel pier is used extensively throughout the world for structural
underpinning and foundation repair. There is much readily available technical information and test results on the web etc. Here are some key points and reasons why the steel pier performs.
Tested on installation - Steel piers are hydraulically driven and tested
to a force of up to 30,000 hydraulic pounds. The average driving pressure
through undisturbed soil is 4000 to 8000 pounds. When the pressure
increases greatly, the building will usually move slightly and the pier is seated.
Thixotrophy - defined as "particles attempting to reoccupy the space from
which they were removed." When the pier is driven, the soil is momentarily
displaced, but very soon attempts to return to its original position. As it
does, it grabs the pier and the support capability is increased because of
this friction resistance. Research has shown that a pier driven at a given
pressure will require 50 to 100% more pressure to continue driving after
Corrosion? - The U.S. Dept. of Commerce National Bureau
of Standards (NBS) states the following in their book titled, NBS
PAPERS ON UNDERGROUND CORROSION OF STEEL
PILINGS. Data obtained by the NBS on the corrosion
performance of steel piles driven into the ground in a wide
variety of soil environments show that the strength and useful
life of steel piles is not significantly affected by corrosion. The test
were run on pilings that had been in service between 7 and 40 years.
1. A 2'x2' hole is dug at the edge of the foundation beam.
2. The bracket is set under the beam and the pier is driven.
3. After all piers are placed, hydraulic jacks are attached to the brackets
and the building is lifted and corrected.
4. The holes are backfilled and the job is completed. (usually 1 or 2 days).
We offer several different pier sizes and designs depending on the job requirements or engineers specs. In general, piers extend to a depth of 9 to 12 feet or bedrock and are machine drilled using a bobcat or smaller auger. Deep drilled piers can also be installed in low clearance, limited access areas.