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Prestressed roof elements

Roof girder

Prestressed roof girders are the main elements of the roof structure, which are usually designed in static schemes as simply supported. Supported by columns, they constitute a system that braces them horizontally and provides support for the roof structure elements.

Use

→ Industrial halls
→ Storage halls
→ Supermarkets

GRADE OF CONCRETE
Concrete grade min. C50/60, reinforcement steel grade AIIIN, prestressing steel Y1860 S7
SPAN
Large span of structure
LOADS
Carrying heavy loads
COSTS
Low upkeep costs with no maintenance required
FIRE RESISTANCE
Standard 60 min fire resistance - up to 240 min possible
SPEED
Rapid on-site installation - an average of 1,500 m² of construction per installation team per day

TECHNICAL DETAILS

Proces produkcji prefabrykowanych dźwigarów dachowych sprężonych

Production process of Roof girder

Prestressed elements can be produced in two ways. Depending on the needs, we use technology that ensures production speed and economic efficiency, with lower consumption of ribbed steel. In the first method, we lay out the complete reinforcement of the element on special production lines designed for producing prestressed elements, through which the prestressing tendons are passed using specialized machines. Then, all tendons are subjected to initial and final tensioning. This process is followed by formwork and concreting of the element. The second method involves laying out the reinforcement components on the production line, through which the tendons are passed. This is followed by pre-tensioning and tensioning to the target force. This is followed by pre-tensioning and tensioning to the target force.

Możliwości produkcyjne prefabrykowanych dźwigarów dachowych sprężonych

Production capabilities of Roof girder

We manufacture prestressed concrete roof girders with a constant I-beam cross-section (type I) or double-pitch girders (type IV) and single-pitch girders (type IT) with a variable height and a slope angle of 0 to 6 degrees - smooth change of the roof slope. The web of the I-shaped element may have openings, for example, for the passage of installations, while the end of the girder can be either a solid block or an I-shaped section. When using girders with parallel flanges (type I), any roof slope can be achieved by appropriately undercutting the support surface. This is often used in single-slope aisles.

Możliwości projektowe prefabrykowanych dźwigarów dachowych sprężonych

Design capabilities of Roof girder

Prestressed girders are usually designed using concrete grade C50/60 or higher. Prestressing tendons with a nominal tensile strength of 1860 MPa are used. A typical cross-section of the prestressing steel has a diameter of 15.7 mm, ensuring faster production and greater load-bearing capacity. Tendons with a diameter of 12.5 mm are used less frequently. Prestressed girders have a span of up to 45 metres.

Transport prefabrykowanych dźwigarów dachowych sprężonych

Transport of Roof girder

Prestressed girders are usually long prefabricated elements, transported in semi-trailers with adjustable length, the so-called stretch trailers with rear steering axles.

Montaż prefabrykowanych dźwigarów dachowych sprężonych

Installation of Roof girder

The installation of laid elements, including roof girders, involves: determining the position of the element, preparing the joint, suspending the element from the hook of the installation machine, main installation, followed by making or finishing the joints. Installation is carried out using a self-propelled crane or lift. When installing girders with larger spans, which are susceptible to wind gusts, it is essential to use hemp guide ropes. These are used to direct the girder suspended on the hook into the correct position.

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Od ponad 30 lat specjalizujemy się w produkcji elementów prefabrykowanych dla budownictwa: od mieszkaniowego poprzez obiekty użyteczności publicznej i przemysłowe, po skomplikowane elementy konstrukcji inżynieryjnych, drogowych, mostowych i hydrotechnicznych. Naszym celem jest produkcja najwyższej jakości materiałów budowlanych z betonu, w tym prefabrykatów nietypowych, wykonywanych na specjalne zamówienia dla firm i dla odbiorców indywidualnych, niezależnie od ich rodzaju i wielkości inwestycji.

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