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A precast concrete system is a structural frame built by connecting columns, beams and roof elements on site after they have been cast in a controlled plant. It combines speed, strength and long service life.
Precast concrete is a construction method in which building elements are cast and cured in a controlled production plant rather than on site, then transported and assembled. A precast concrete system is the structural frame these elements form when connected together as columns, beams and roof. In Turkey it is also referred to as prefabricated concrete or, in code terminology, precast reinforced concrete.
At Demircihan Prefabrik, we produce precast concrete systems that are durable, long-lasting and offer high load-bearing capacity. We manufacture our high-strength precast elements with a modern production approach at our plant in Teknova OSB, Elazığ.
| Element | Role in the system |
|---|---|
| Precast column | Vertical member carrying loads to the foundations |
| Precast beam | Horizontal member tying the columns and carrying floor and crane loads |
| Roof truss | Sloped roof girder spanning the main bay of the roof |
| Purlin | Secondary roof member supporting the cladding |
| Gutter beam | Combines a structural beam with the roof gutter |
| Custom elements | Parts designed specifically for a project |
With cast-in-place concrete, formwork, reinforcement and concreting happen in sequence on site and are directly exposed to the weather. In a precast system, elements are produced in the plant while foundation work continues on site, so site work is reduced largely to erection. The plant environment allows more consistent control of concrete mix, curing, cover and dimensional tolerances. The product standard for linear precast structural elements such as columns and beams is TS EN 13225.
Because foundation work and element production run at the same time, the structure generally goes up faster than a cast-in-place frame. With site work reduced largely to erection, there is also less formwork, scaffolding and congestion on site.
Connections are the most critical factor in the seismic behavior of precast buildings. The Turkish Building Earthquake Code sets out specific rules for precast reinforced concrete buildings. Systems designed to these rules, detailed correctly and erected according to their drawings are engineered to deliver the performance the code targets.
Roof trusses and beams create the wide, column-light interiors that industrial buildings need, giving flexibility for machine layouts, racking and internal traffic.
Concrete is non-combustible. The fire resistance of each element is secured at design stage through section size and the concrete cover over the reinforcement.
Concrete elements produced under controlled conditions stand up well to the elements and, unlike steel systems, do not need regular painting or corrosion maintenance.
Concrete is not a new material for Demircihan. We come from a construction tradition that has worked on infrastructure projects such as dams, ponds, bridges and viaducts since 1998, and our active concrete batching plant and quarry are part of that experience. Today we turn the same experience into the structural elements of industrial buildings at our precast plant in Teknova OSB.
At every stage of production, we hold to technical discipline, a modern approach to manufacturing and customer satisfaction.
Hakan Özdemir, Chairman of the Board
Load-Bearing Elements
A precast column is a vertical reinforced concrete member produced in the plant and set into its foundation on site. It carries beam and roof loads down to the foundations and forms the structural frame of an industrial building.
Beams
A precast beam is a horizontal precast concrete member that spans between columns and transfers roof, floor or crane loads to them.
Roof Elements
A precast roof truss, often called a roof girder in precast terminology, is the main roof member that spans the wide bay between columns and carries roof loads to them. Purlins sit on top of it and support the roof cladding.
Roof Elements
A purlin is a secondary precast roof member laid across the roof trusses to support the roof cladding. It transfers cladding and roof loads to the trusses.
Roof Elements
A gutter beam is a U-shaped precast member that sits on the columns along the eaves or at the valley between adjacent bays. It acts as a structural beam while collecting rain and meltwater and channeling it to the downpipes.
Custom Production
Custom precast elements are concrete members designed for a specific project and produced in the plant when standard columns, beams and roof elements cannot meet the required geometry, openings or connection details.
A precast factory building is an industrial production facility whose structural frame of precast columns, beams and roof elements is made in the plant and quickly erected on site by crane. Its wide, column-light interior leaves room for the production line.
A precast warehouse is an industrial building with a frame of plant-produced precast concrete elements, designed for storage and logistics with a wide, high interior. It is planned around racking layout and forklift traffic.
A turnkey industrial building is a delivery model in which one contractor manages the entire process, from design and precast production to erection and finishing works, and hands the building over ready for use.