solutionsdeep foundation underpinning

Deep Foundation Underpinning

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What is Deep Foundation Underpinning?

Deep foundation underpinning strengthens and stabilizes soils beneath large or heavily loaded structures. Using trenchless polymer injection, foundations are reinforced at depth to correct settlement and extend the service life of critical infrastructure.

Problems Solved

  • Differential settlement undermining deep foundations
  • Soil weakening caused by groundwater infiltration
  • Structural cracking and misalignment in heavy buildings
  • Loss of bearing capacity beneath industrial pads or tanks
  • High costs and disruption from traditional underpinning methods

Types of Polymers Used

High-Density Polyurethane Foams

  • Expands to densify and stabilize loose backfill soils
  • Provides lightweight reinforcement without added soil pressure
  • Cures rapidly to minimize operational disruption

Structural Polyurethane Resins

  • Creates rigid reinforcement zones behind walls and utilities
  • Transfers structural loads to stable ground layers
  • Extends service life of supported structures

Hydro-Insensitive Polymers

  • Expands and cures in wet or groundwater conditions
  • Seals voids and prevents erosion in saturated soils
  • Provides long-term durability in challenging sites
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Benefits of Deep Foundation Underpinning

Deep foundation underpinning with polymer injection restores stability to compromised structures without costly excavation. These solutions correct settlement, reinforce soils, and provide long-lasting protection for critical assets.

Long-Term Support for Heavy Structures

  • Corrects differential settlement in deep foundations
  • Provides durable, trenchless reinforcement at depth
  • Minimizes disruption during structural stabilization
  • Extends the life of industrial and commercial assets

Key Applications

Industrial Facilities

Stabilizes heavy plant and factory foundations under constant load

Storage Tanks

Restores stability beneath tank pads and containment areas

Bridges & Piers

Reinforces soils supporting deep foundations and abutments

High-Rise Buildings

Corrects settlement beneath heavily loaded structures

Utility Substations

Stabilizes pads and foundations supporting transformers and equipment

Marine Structures

Reinforces soils beneath wharfs, docks, and pile-supported assets

Services

Deep foundation underpinning is supported by these services:

Foundation Repair

Foundation Repair

Corrects settlement in large or deep foundations

Soil Stabilization

Soil Stabilization

Strengthens weak soils beneath heavy structures

Settlement Mitigation

Settlement Mitigation

Restores alignment and bearing capacity

Void Filling

Void Filling

Eliminates subsurface cavities beneath pads and piers

Structural Reinforcement

Structural Reinforcement

Provides durable long-term support

Deep Injection (UDI)

Deep Injection (UDI)

Compacts foundation soils at depth to restore bearing strength and prevent future settlement

How the Process Works

1

Investigation

Foundations inspected for settlement, voids, or weak soils

2

Planning

Injection design developed to reach required depths

3

Access

Small-diameter injection points installed with minimal disruption

4

Injection

Expanding polymers reinforce soils beneath deep foundations

5

Monitoring

Settlement and lift tracked in real time for precision

6

Validation

Final inspection confirms restored stability and support capacity

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