Ntobeko Mathe’s Post

Prestressed concrete is a system devised to provide sufficient precompression in the concrete beam by tensioned steel wires, cables, or rods that under working conditions the concrete has no tensile stresses or the tensile stresses are so low that no visible cracking occurs. #pre-tensioning Structure #post-tensioning Structure Pre-tensioning, steel wires are tensioned before concrete is placed and hardened. In Post-tensioning, steel wires are stretched out once the concrete is settled and hardened. In post-tensioning, the longitudinal profile of the steel wires can be placed at any desired profile. Below is the best example of the strength of structures after prestresing of concrete beam structure.

Concrete Lining Transferring large amounts of water using underground tunnels seems to be pretty straightforward at first. One would falsely forget about the high permeability of the heavily blasted tunnel structure and the natural cracks and pores of the surrounding rock mass. This raises the need for an impermeable vessel that can withstand the high hydrostatic pressure of the transported water. A hydraulic needle-beam formwork that can extrude the wanted round profile of the concrete tube while moving through kilometers of tunnels is an excellent and more economic way of achieving this goal. This special formwork will create the perfect aligned circular concrete profile while adjusting to the abnormalities of tunnel excavation. Embedded pipes are inserted before casting to insure post-grouting of the concrete-rock interface for watertight structure.

Diaphragm Walls - We're the Experts! Diaphragm walls have a static and/or sealing function and can serve as cut-off walls for dams or excavation pits, as foundations or as enclosures of structures. They are executed as concrete or steel-reinforced concrete walls, built from ground level. They are excavated in sections by duty-cycle cranes, using suitable diaphragm wall grabs or cutters, with the aid of a stabilizing fluid, between previously fabricated guide walls, which serve primarily to guide the excavator, allow fluctuations in level of the stabilizing fluid and carry temporary loads from the reinforcement or stop end elements. When the final depth is reached, temporary or permanent stop ends are installed in the trench, the stabilizing fluid is desanded and reinforcement cages are installed. Then the concreting is carried out. #diaphramwall #foundations #bauerpower #passionforprogress