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Tag Archive: ground control

  1. Tunnel Passing Through Fault Zone helped with Polyurethane Injection

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    The polyurethane grout, SealGuard II, was needed to mine forward in this tunnel.  The tunnel was in a fault zone, and all the voids were to be filled with concrete.  However, when injected, the concrete leaked out of the face.  To contain the concrete, polyurethane grout was injected to provide a buffer. SealGuard II reacts is about 3 seconds and produces a rigid foam (900 PSI compression strength).  With the concrete contained in its intended location, advancing was able to commence. SealGuard II is manufactured by SealGuard, Inc. and the grouting was performed by Sub-Technical, Inc.




  2. Lake Spillway Leak Repaired with Polyurethane Injection

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    Water was leaking out of this lake because it was flowing under the spillway instead of over it.  Polyurethane grout injection was used to remedy the situation.  Holes were drilled on the face deep enough to reach the backside of the spillway.  Mechanical packers were then placed in the hole.  The installed packers are now an injection port to hook up to the grout pump, which pumps the polyurethane to the back side of the spillway.  The grout used was Hyperflex, a moisture activated polyurethane.  Once in contact with the water, it foams to fill the voids and seal the leak paths.  Hyperflex is NSF/ANSI/CAN 61 approved for contact with potable water and is manufactured by SealGuard, Inc.  The grouting was performed by Sub-Technical, Inc.


    spillway repair with polyurethane injection