Supporting, sealing and watertightening

Injection operations cover an extensive range of application from waterproofing to crack sealing and groud-rock consolidations. Water inflows in tunnel structures represent major hazards, also hindering and delaying excavation and rifting processes. Sika Provides and extensive range of solutions including service and tools to make tunneling operations safe, fast and dry. Sika injection systems are a powerful technology to consolidate and stabilize the ground to prevent and/or solve any water income and any ground / rock consolidation need.

Synthetic Injections

There are three key success factors to ensure the effectiveness and durability of injection works. The injection materials, the injection equipment and the injection method. These must all be used in the right combination and this is what Sika provides for Tunneling and Mining applications including:

  • Cavity & void filling
  • Soil / ground stabilization
  • Rock mass stabilization
  • Permanent ground consolidation
  • Waterstopping – under hydrostatic pressure
  • Controlling over-blasting
  • Underpinning
Water sealing injections

SikaFix® range includes  2-component polyurethane resins which penetrate and cure to consolidate and stabilize fault zones. In situations with high water ingress, SikaFix® 2-component  PU is a particularly powerful solution due to its special formulation giving slight foaming properties in contact with water to expand and very effectively stop the inrush. This modular system also includes accelerators which can be used to increase the foaming factor and to adjust the time needed for this expansion.

Consolidation and filling cavities

SikaFix® range has also a silicate based injection that is designed with a high expansion factor. This helps to fill and stabilize large voids and to give additional support to the roof and ribs of the excavated structure. The stabilizing effects of SikaFix range ensures a faster and safer construction process. SikaFix® range includes as well polyurethane foam resin designed for the filling and stabilization of smaller voids and smaller cavities, it expands both with and without water.