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UnderpinningUnderpinning is the art/science of extending additional
support to existing foundations at or below grade to a deeper elevation or load
bearing strata. This is often required Underpinning is generally used for remedial or precautionary purposes. Remedial underpinning adds foundation capacity to an inadequately supported structure. There are several methods used to extend the foundations of a structure - they include hand-dug underpinning piers, bracket piles, helical piers, jacked piles, screw piles and minipiles. Each of these systems must be designed with a knowledge of
the building’s structure, and the methods, sequence and craftsmanship of its
construction. With this knowledge, engineers design an underpinning
system specifically for your situation. Prior
to digging Underpinning is used to obtain additional foundation capacity to sustain higher loads or accommodate ground condition changes. Precautionary underpinning is often used when adjacent excavation occurs below the existing foundation level. Precautionary Underpinning is accomplished by installing piers or piles into the existing foundation. Gibson’s Pressure Grouting Service can provide specialty designed and engineered underpinning services to industrial, commercial, municipal and residential clients.
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when excavations are made next to
existing structures or when the original foundation is settling. The art of
underpinning requires an engineer to analyze the existing structure, determine
the loads, the bearing capacity of the soils, and then design an underpinning
system to support the structure with a minimum of settlement.
for piers,
the need for temporary support that may need
to be installed is evaluated. Additional building support if needed is accomplished by
shores, needle beams or grillage.