Water Sealing Blog - Tag: TBM

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 

Tunnel Boring and Grouting

By Chris on 10-22-2020

The entrance of a tunnel being created by a tunnel boring machine can be as fascinating as the TBM itself.  Countless systems are being fed and networked to workers miles away.  That intricacy doesn’t just stop there. Even a seemingly simple task like routine maintenance ca... Read More

Category:  Company Information
Tags:   Polyurethane Injection Grout TBM ground consolidation stabilization water control  

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