News

Preparation and Rehabilitation of Permanent Ventilation Seals

01-30-2012

Background in development, Installation and Rehabilitation of Permanent Ventilation Seals in Coal Mines

The Principals of Sub-Technical were deeply involved in the development and testing of a variety of explosion proof seals from the late nineteen eighties onward. Designs included steel sets with interlaced, imbedded rebar and an internal bladder filled with cementitous grout, (similar to the "Precision Seal", currently installed by Strata Services, Inc.).Additionally a variety of Composite Barrier Seals using Block walls to contain the core.

Being established in 1996 Sub-Technical undertook as an approved installer for the "Minova" "Plug Seal" for a number of years. In addition we were appointed by the "Mowlem Group, Plc." (Australia) to install and advise per Testing and Approval at the Lake LLyn Facility. These were also an imbedded steel/Rebar interlaced structure which was then Gunnited.

Our portfolio of projects related to Sealing also includes Bulkheads, deep under Lake Superior to contain Sulphuric Acid leaching solution. Also many Bulkheading projects for Coal Mining, in which we incorporated a proprietary “Burst Hose” installation, prior to filling of the forms. This system allows complete “ring grouting” once the cement is cured, (and shrunk), without ever drilling a hole