MOORE & TABER                     

 

 

Soil Grouting and Ground Improvement Specialists

 

         

Mechanical jacking is a process whereby structures can be releveled from the foundation's base, in contrast to disconnecting at the sill.  The advantage is that this type of jacking effort will typically translate to adjacent interior slabs, reducing the need for slab replacement.  The detail below is part of a process developed by Moore & Taber for mechanically lifting foundations.

Jacking pits are typically positioned every five feet, or so, beneath continuous foundation elements in the area to be lifted.  Jacking force is then applied as needed to raise the structure in the desired sequence.

Once raised to the desired elevation, jacking pits are backfilled with concrete.  Mechanical jacking may also be performed in conjunction with bond beam construction. These underpinning elements can be cast monolithically, resulting in an integral supplemental foundation.  This type of foundation is often recommended for undersized footings, or in areas where expansive soils are prevalent.

Void space beneath the raised footings and slabs is then backfilled by subsealing.

Please contact Moore & Taber for additional information on mechanical jacking, or if you would like input for your specification.