Products We Use

 

Resistance Piers ( also known as push piers and micro piles)

resistance piers

The ECP Steel Pier™ belongs to a family of underpinning products that are sometimes referred to as micro piles, push piers, or resistance piers. These underpinning products are driven hydraulically into the soil using the structural weight of the building as a reaction force. A friction reduction collar is attached to the lead section of pier pipe. The purpose of the collar is to create an opening in the soil that has a larger diameter than the pier pipe. This dramatically reduces the skin friction on the pier pipe as it is driven into the soil and allows the installer to load test and verify that the pier encountered firm bearing stratum or rock that is suitable to support the design load. The ECP Steel Pier™ like other resistance piers is an end-bearing pier that does not rely upon nor requires skin friction to produce support. Each pier is field load tested after it is installed. The piers are able to develop a factor of safety because the piers are installed and load tested individually using the maximum weight of the structure as the reaction force. The ability of the system to develop significant factors of safety comes from the different methods used between pier installation and load transfer during restoration. The piers are driven individually and the entire structure works as the reaction; but during load transfer hydraulic jacks are placed at multiple locations thus reducing the load on each pier to only the design working load. A building with substantial construction and rigidity can develop greater pier factor safeties than a weaker structure.

 

Helical Piers ( also known as screw piles )

pwu helical Screw piles or Helical Piers have been in use for more than 160 years. In 1838 a lighthouse was built upon screw piles designed by an Irish engineer, Alexander Mitchell. In 1863, Eugenius Birch designed the Brighton West Pier in Brighton, England. These piers are still in use 140 years later. The original screw piles were installed at 10 feet per hour using eight 20 foot long torque bars and the force of 32 to 40 men. Sporadic use of screw piles has been documented throughout the 19th and early 20th centuries mainly for supporting structures and bridges over weak or wet soil. Hydraulic torque motors became available in the 1960’s, which allowed for easy and fast installation of screw piles. Screw piles then became the favored product for resisting tensile forces. Electric utility companies began to use screw piles for tie down anchors on transmission towers and for guy wires on utility poles. Screw piles are ideal for applications where there is a need to resist both tension and axial compression forces. Some examples of structures having combination forces are metal buildings, canopies and monopole telecommunication tower foundations. Current uses for screw pile foundations include foundations for commercial and residential structures, light standards, retaining walls tieback anchors, failed foundation restorations, pipeline and pumping equipment supports, elevated walkways, bridge abutments, and numerous uses in the electric utility industry.

 

Basement Tieback Anchors

tieback anchorsBasement Tieback Anchors are designed to stabilize and strengthen bowed or cracked basement walls on existing structures. It is also possible to pull the wall back into proper alignment by excavating the soil on the exterior prior to tensioning the tieback anchors.

We use products from Earth Contact Products.