Sub Technical Inc 724-625-0008 24/7
Underground Water Control

"Fast, Efficient,
and Professional"

"They stopped water I thought
would never be stopped"

"Sub-Tech won't leave until
the job is done right"

"Response time in an
emergency is FANTASTIC"

"Their technicians were very helpful
and really know their business"

"Sub-Tech has always taken the time to
explain everything and answer my questions"

"You may as well call them first because if
you don't, you will be calling them second"

Tunneling with Help from Above

By Chris on 07-03-2018

Sub-Technical, Inc. recently went “Above-Technical” for a week-long project. Seventy feet below the surface, a tunnel boring machine was hard at work. However, the TBM was entering an area with very soft ground conditions. When soft ground conditions are encountered, the new bore is at risk of collapse. Not only costly, a collapse puts lives in danger. One solution to prevent this is to create a “safe haven”. A safe haven is an area of a tunnel that is shored up and allows workers to perform maintenance on the TBM without the possibility of a collapse. Creating a safe haven is often easier said than done, mainly due to the presence of the TBM. Access to the front of the machine and the freshly bored ground is nearly impossible in unstable conditions. Always innovating solutions to problems, Sub-Technical, Inc., was called. Drilling down from the surface to the area in front of the TBM, material was injected at high pressure. The material consolidated the loose ground, thus creating a solid monolithic mass that provides the desired safe haven.