Special Applications

Underpinning
The purpose of underpinning is to strengthen and reinforce an existing foundation, generally by extending its depth and breadth.
Oil Well Abandonment
A well abandonment is the plugging of a well that has been abandoned (permanently closed and sealed) or is otherwise orphaned (or may become deserted in the future).
Cut and Cover
Traditional tunneling methods, such as cut-and-cover, also known as the open-cut method, involve opening the ground surface and digging to the required depths. Backfilling the excavation takes place once the construction is complete. It is used when excavation from the surface can be done efficiently and economically, and when environmental considerations are not a problem.

Cut and Cover

The new Sutter Health Van Ness Geary Campus includes a pedestrian tunnel underneath Van Ness Avenue in San Francisco. Van Ness Avenue is designated US 101 - the main north south route through San Francisco over the Golden Gate Bridge.…

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Oil Well Abandonment

The Gerald Desmond Bridge in Long Beach, California spans the Wilmington Oil Field – one of the largest oil fields in the continental United States, with more than 6,000 oil wells. In order to construct the new bridge, all active…

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Underpinning

Malcolm’s underpinning systems allow excavation adjacent to and directly below sensitive structures and facilities. Low vibration and sequenced construction techniques are employed to provide vertical load capacity while maintaining ground support. After new support systems are installed, load is transferred…

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