The premier product supplier to ventilation wall applicators who deliver long-term ventilation solutions to the mining industry. The Robust Building System provides a unique blast prone ventilation wall up to 60 meters from the blast face. It has a superior strength of 40 Mpa compared to normal brick and mortar walls.
Creates a backing to which the Robust core panels are fixed with pre-stressed wire of vertical props with horizontal timber at various intervals.
Tie or screw Robust core panels to the backing by overlapping each panel by 20mm. (Panel length size to the maximum height of opening).
For standard ventilation walls apply a 75mm thick 25Mpa shotcrete mix to only one face of core panels to complete the wall structure.
For blast prone walls, apply a 75mm thick 40Mpa shotcrete mix to both faces of Robust core panels with added 8mm horizontally spaced reinforcing bars.
Due to the fact that the ventilation walls do not carry substantial weight it is not necessary to make use of foundation.
Although it is preferable that all ventilation walls are built on solid ground, and not on soft soil, we suggest that the following standard and steps be taken when building on loose soil and/or solid rock:
After Robust core panel walls are checked and approved for being secured and stable, the walls are ready for shotcreting.
Each side of the Robust Core wall panel need to be shotcreted up to a thickness of at least 50mm from the deepest point of the Robust core. Because of the “zig-zag” pattern of the Robust core, the total thickness of the wall once shotcreted on both sides, will be approximately 50-55mm. This thickness will be satisfactory as long as all steel products are covered by the concrete, preventing oxidisation to occur on the steel.
We advise that the walls should have a minimum setting time of at least 24 hours, preferably 48 hours, before blasting commence within the section that the wall has been erected.
Whole perimeter of wall area must be sprayed on both sides of wall, at a curve that is 75mm at its thickest point if measured to the middle of the steel frame of the wall at an angle of 45 degrees.
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