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Lift-relevel sunken road surface in an industrial estate

Factors causing sunken road surface

Constructions obstructing water ways, fewer recharge areas, transformation of land for residential purposes, all of these factors can cause poor drainage that weakens the soil under the road. Heavy traffic on loose and weak soil will finally lead to road subsidence that puddles in the rainy season. The puddles can be hazardous for accidents and must be fixed as soon as possible.

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Problem solution by using polyurethane technology

The polyurethane injection technology is an excellent solution for fixing sunken road problems. The technology features a special polyurethane that can expand as much as 10-20 times which can permeate voids under the sunken concrete road. Polyurethane is a material that has been researched and developed to withstand loads as high as 50 tons. It is able to combine with the subsurface material while expanding to lift the road surface. The expansion can also drive out water under the concrete. Moreover, it can endure large vibrations caused from heavy vehicles. The technology will also extend the life of the concrete surface.

Repair operation by Tesla Engineering

Sunken and puddled roads are fixed by identifying the road surface levels and calculating the height rise for polyurethane injection. The flow direction is carefully determined to ensure that the water can drain properly and that no more puddles will develop in the future.

Method for lifting-relevelling road surfaces

Repair procedure

  1. Close off 1 lane for safety purposes
  2. Bring the operation truck into the area
  3. Confer and develop plans
  4. Install equipment
  5. Survey the current surface levels
  6. Mark drilling locations
  7. Install levelling lasers
  8. Drill 16-mm holes through the concrete
  9. Prepare a 90-meter injection hose
  10. Perform a trial polyurethane injection
  11. Install injection pipes
  12. Inject polyurethane to lift the surface
  13. Check and regulate the height of rise every 0.5 mm
  14. Identify the surface level after repair
  15. Fill the drill hole and any cracks on the concrete surface with Epoxy mortar
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Subsidence of a road at a T-junction causes ponding every time it rains. The water collects in the sunken area, unable to drain properly. The injection of polyurethane was carefully calculated to lift-relevel the surface and allow the water to drain in the right direction, preventing future ponding.