Precast Concrete Twin Walls
Twin walls can be used as standard cantilever retaining walls or more commonly, propped cantilever retaining walls depending on design requirements, making them ideal for basement retaining walls, and internal structural walls.
Advantages of Twin Walls
- Twin wall manufacture is based on an automatic production system, therefore overall lengths and prescribed reinforcement is always exact.
- Perfectly smooth surfaces on both faces are achieved during the manufacturing process which can be directly painted onto.
- Total wall thicknesses up to 400mm can be achieved.
- Twin walls can be used as standard cantilever retaining walls or more commonly, propped cantilever retaining walls depending on design requirements, making them ideal for basement retaining walls, and internal structural walls.
- Up to 16mm diameter reinforcement in both faces of solid wall can be catered for.
- Walls can be used as shear walls within a multi-storey building.
- Fully concreted connection at the end of the precast twin walls provide the required sound rating.
- Because of the reduced overall width of precast section, (max 150mm), wall length can be increased up to 12m while keeping wall weights to a minimum, thus reducing the requirement for large crane capacities on-site.
- Vertical ties are easily catered for on-site because of the initial hollow infill section between the precast wall sections, thus increasing the tolerance on starter bars cast into in situ foundations etc.
- Electrical socket outlets and conduits can be cast into both faces of the wall panel, conforming to BS standards and compatibility.
- M16 sockets are precast into panel face to take diagonal push pull props on-site thus, increasing installation speed and reducing damage to the panel on-site.
The Benefits of Precast Concrete Twin Walls
Precast twin wall concrete construction, a system which has been in successful use for many years, offers many benefits both to the building industry and the end user. Twin walls can supply the strength and stiffness necessary in a shear wall, and are an ideal choice for propped cantilever retaining walls in settings such as basements; they can also be used as standard cantilever retaining walls.
As on-site labour is minimised, when using precast twin walls the building process is much less weather-dependent than with other construction techniques, and there is a substantial saving in construction time.
Further on-site savings result from the minimisation of waste, and the reduced need for storage space. Fabrication in controlled factory conditions also allows for precision in quality and specification.
Because of the saving in weight which the double wall system provides, precast twin walls can be made in large sections; another advantage of their lower weight is the reduced need for on-site craneage. The production process produces a smooth surface to which paint can be applied directly, resulting in a further saving of time. Twin walls can also be customised, for example with cast-in fittings for electrical sockets and conduits, reducing the need for later drilling and cutting.
For the end user, twin walls have many advantages with regard to the comfort and practicality of the building; they provide good heat and sound insulation, and can also act as a heat store, warming the building by night from heat absorbed during the day. They are fire-resistant, and require minimal maintenance; as a result, there are potential savings in both daily-to-day and repair costs.
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