LLC "MСC-Shaftproject"
Technologies
Preparation of shafts in severe mining and geological conditions, in loose water-flooded rocks is a complicated engineering task that cannot be solved without application of special working methods and innovative developments.
Fibre concrete
Fibre concrete has been used as a material of load-bearing structures for over 40 years, including over 20 years - as a material of tunnel lining structures.
Fiber reinforcement allows compensating for main deficiencies of concrete - low tensile strength and impact brittleness. As compared to regular bar reinforcement, fiber reinforcement brings economic benefit during erection and manufacturing of structures due to the following:
1
Significant reduction in labour input to manufacturing of reinforcement cages, cutting down the cost of structure repair because of fewer internal defects such as non-vibrated zones behind the reinforcement and higher resistance to cyclic impacts (drying - dampening, positive - negative temperatures, vibration, etc.) for prefabricated, cast-in-situ and sprayed-concrete structures.
2
Enhanced stability of the lined working, better safety of works when lining the working with sprayed concrete during sinking of tunnels, faster and safer recovery works in case of emergency - with the use of sprayed fiber concrete.
Use of bolting
Bolting is intended for stiffening the rock massive and enhancing stability thereof by bolting rock layers of different strength.
Purpose of road lining reinforcement:
-1-
Reduction of front abutment pressure impact on road stability.
-2-
Re-use of roads for ventilation purposes (airway, gas-draining channel, combined scheme of breaking face blowing-over) and availability of escape ways.
-3-
Implementation of pillarless panel removal (lower amount of preliminary underground workings, higher coal recovery factor)
-4-
Operation of the power-driven system without face-end support.
-5-
Ensuring stability of peripheral rocks in low-depth underground workings.

Bolting used
Combination
bolts
Rope
bolts
Support
structures
Fixed with
capsules
Fixed with capsules and by blow-in
USE OF THE SHAFT SINKING SYSTEM WITH PARALLEL SETTING OF SHAFT LINING
Shaft sinking is performed with the shaft sinking system (without drilling-and-blasting operations). Shaft lining is performed while sinking.
Vertical shaft sinking system SBR has been developed and currently manufactured for DMC Mining services (contractor of BHP Billiton) to be used in construction of the mining and processing combined works on the potash field in Canada, as well as in construction of two shafts in Starobinskoye potash salt field for the Nezhin mining and processing combined works Slavkaliy, the Republic of Belarus.
SHAFT SINKING SYSTEM SBR
Basic components
Use of the proven soil recovery technology.


A cutting unit structure similar to that of VSM.

A gripper device for sinking process stabilization.

Transportation of broken muck via a vacuum pump.

Integrated lining setting system.

Powerful ventilation system

Process platforms may be equipped in accordance with requirements
The weight of SBR system at 9 m diameter is 300 tons.
WATERPROOFING, PLUGGING AND INJECTIVE MATERIALS
Specialists of LLC "MСC-Shaftproject" use materials for waterproofing recovery by injection of hydro-structural resins by world manufacturers such as BASF, Monova, Zika, MC Bauchemie, etc.
Use of Penetron waterproofer allows preventing the water from penetrating through the concrete bulk even at the quite high hydrostatic pressure. Use of material allows protecting concrete against corrosive fluids: acids, effluents, ground waters, sea water. Concrete treated with Penetron acquires resistance to carbonates, chlorides, sulphates, nitrates, etc. Use of Penetron enhances figures of impermeability to water, strength, freeze-thaw resistance of concrete that persist even under high radiation effect. The material is used for waterproofing of surfaces having pores, cracks with opening width under 0.4 mm. Waterproofing of surfaces having pores, cracks with opening width over 0.4 mm as well as of welds, joints, interfaces, abutments, utility entrances is achieved with Penekrit combined with Penetron.

The main goal of Masterflex is sealing of dams, surface isolation, prevention of cracking on the rock surface on the roof and sides, surface protection against environmental impact, waterproofing. Due to its adhesive properties the material wraps the rock mass and penetrates in cracks and small voids on the working surface thus making a solid air-tight film.

Two-component coating Spray-On Plastics by RockWeb, which is applied by spraying is a 100% dry, solvent-free substance intended for soil stabilization in ore fields. A unique property of RockWeb allows clogging big cracks in the surface layer of the rock.