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Tag Archive: injection

  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. Bridge Rehab with Polyurethane Grout Injection

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    Bridge Rehab

    Although structurally sound, this bridge had some hairline cracks that would continually drop water onto traffic below. By inserting mechanical packers alongside the fractures and injecting polyurethane grout, the seepage was able to be stopped. The polyurethane grout used in this application was Hyperflex, a single component, moisture activated material that is NSF 61 approved for contact with potable water. Hyperflex is manufactured by SealGuard, Inc., and the instillation was performed by grouting contractor Sub-Technical, Inc.