Sub Technical Inc 724-625-0008 24/7
Surface Ground 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"

"Sub-Tech succeeded where other
companies failed miserably"

Surface Ground Control

Compaction Grouting

This can be performed when ground conditions are "soft" or incompetent. Polyurethane Grouts of an expansive type are particularly suitable for this purpose since they are injected in liquid form (allowing for excellent penetration) and during reaction are expansive, which simultaneously creates compaction and consolidation. This increases in-situ strength enormously and generally, also provides a waterproof barrier.

Highwall Stabilization

Whether during construction of new mine portals, or following harsh climatic changes, the face of highwalls can present significant hazards. Sub-Technical can provide easily deployed methods to contain and secure these areas. Methodology can vary from installation of bolted mesh covering and may include polyurethane grouting which consolidates broken rock and makes the area safe.

Low Cover Crossing

Mining - in Appalachia in particular - often presents issues where valleys must be crossed underground to gain access to reserves. Often this means that a number of surface features existing in the valley must be protected from the possibility of undermining in close proximity, causing damage. Additionally, the safety of the workforce and integrity of entries underground must be assured. Surface features may include the following: Buildings, Roads, Rivers, Railroads, Sewers and Utilities.

Sub-Technical has developed methods and materials to ensure successful grouting, which incorporate ground anchoring members that also act to support and distribute loading.

In a recent project by working in advance of the mining cycle three entries were taken under an active railroad, a busy two lane road and a river. The minimum cover was 25 feet in mixed shales. The net result at the surface was that there was no disruption or damage to road, rail or stream. Underground, the three entries progressed rapidly through the area with out any problems of ground control or water inundation whatsoever.

Tie Backs

A common means of retention and support, Sub-Technical has the equipment and workforce to effectively place these anchors. Where doubtful conditions exist engineers may wish to consider polyurethanes grout as the anchoring medium due to its versatility and mechanical properties. Sub-Technical is also involved in remedial measures to seal and reconstitute failed anchors to and beyond original test criteria.

Compaction Grouting
Highwall Stabilization
Low Cover Crossing
Tie Backs