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Underpinning
 
Underpinning is typically applied to a structure that has experienced differential foundation settlement. It involves the instalation of deep piers or piles to support an existing foundation. Underpinning can be used to support all or part of a structure. The type of underpinning application used (concrete piers, steel pites, helical piers etc) depends largely on site conditions i.e. topography, soil type, and equipment access. Underpinning can be used in conjuction with Re-leveling to both stabilize and lift the foundation
  click to enlarge  
Underpinning Pier Installation
   

Drilling of a shaft for an underpinning pier in Lafayette, CA

   Steel reinforcement of the underpinning pier prior to concrete placement   A prefabricated steel cage is placed in the drilled shaft prior to concrete placement
   

A portable drill rig is used to drill shafts in areas with difficult access

   A close up view of the drill auger on the portable drill rig   A view of the haunches after concrete placement
     
Two underpinning haunches prior to releveling of the house   A view of an underpinning haunch with a hydraulic jack in place    
Difficult Access Drilling
   
A large drill rig is set up on the street to drill shafts for underpinning piers against the building   The drill rig lowering the auger into the shaft   The drill rig viewed from the opposite direction
       
The drill rig viewed from across the street        
Deck Piers
   
Drilling of a pier shaft for a deck that is to be installed along a creek bank   A view of some of the deck piers after concrete placement   The finished deck piers with steel beams in place to support the deck structure
Underpinning Piers
     
Installation of underpinning piers below a house threatened by a landslide   Drilling of the next shaft    
Concrete Haunch   Underpinning Pier   Drill Rig
   
A concrete haunch with a hydraulic jack that will be used to relevel the house   Steel reinforcement in an underpinning pier prior to concrete placement   A drill rig lifts a steel reinforcing cage into place
 
 
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