Water Sealing Blog - Tag: Tunnel

TBM Launch Pit Injection

By Chris on 01-28-2021

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 th... Read More

Category:  Company Information
Tags:   TBM Water control Launch Pit Tunnel Rib 

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

By Eric on 11-21-2019

As winter approaches, a heavy rain event proved to be “the straw which broke the camel’s back” for this turn of the century block and brick-built tunnel. Heavy rains recently caused the loosening and partial collapse of the structure internally. Constructed of four row... Read More

Category:  Company Information
Tags:   rail culvert tunnel repair sinkhole collapse 

Concrete Segment Polyurethane Injection

By Chris on 09-24-2019

Leaking concrete segments are injected with polyurethane grout in a tunnel that was created by a tunnel boring machine. The grout used was Hyperflex, which is injected as a liquid. The liquid material reacts with moisture and creates a hydrophobic foam to stop the infiltration. ... Read More

Category:  Company Information
Tags:   TBM Segment Concrete Injection Seal leak Tunnel Grouting Polyurethane 

Tunnel Grouting after a TBM

By Chris on 08-27-2019

Tunnel boring with a TBM creates many opportunities for polyurethane grouting. For instance, the tail seal brushes of a tunnel boring machine are coated with grease to act as a water barrier, as ground water needs to be kept in the front of the machine. Over time the brushes wear out an... Read More

Category:  Company Information
Tags:   Tunnel water control. TBM  Boring Machine Polyurethane Grout Concrete 

CSO (TBM) Tunnel Leak Sealed by Sub-Technical

By Teresa on 01-27-2016

One hour and 55 gallons of chemical grouting & this leak was sealed by chemical grouting company Sub-Technical Inc using polyurethane grouts from SealGuard Inc.  This video shows the access shaft leading to the CSO (Combined Sewer Overflow) Tunnel that is part of the Storm ... Read More

Category:  Industry News
Tags:   Sealguard II extreme leak cso tunnel tmb shaft