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Underground Water Control

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Water Control Blog

TBM Launch Pit Polyurethane Injection

By Chris on 28-01-2021

Grouting contractor Sub-Technical, Inc. injects SealGuard II into a launch pit for a tunnel boring machine to stop water infiltration. SealGuard II is fast reacting a dual component polyurethane grout. In this instance, it was injected with a pneumatic pump and a mechanical packer. Note the various injection sites on the rib. This is because the area was extremely porous. When the water infiltration was stopped in one area, it would flow to a different spot. The grouter had to "chase" each leak until it was eventually sealed.

Tunnel Boring & Grouting

By Chris on 22-10-2020

The entrance of a tunnel being created by a tunnel boring machine can be as fascinating as the TBM itself.  Countle... Read More


Leaking Valve Sealed with Grout

By Chris on 12-08-2020

A municipality needed to seal off a leaking water main valve in order to decommission the system.  They decided inj... Read More


Intake Shaft Water Control

By Chris on 26-05-2020

Pictured is the looking down view of a high-pressure water leak, in an intake shaft of a mine. The water intrusion was 2... Read More


Rescuing a Turn of the Century Culvert under a New York Rail Line.

By Eric on 21-11-2019

As winter approaches, a heavy rain event proved to be “the straw which broke the camel’s back” fo... Read More