A line for the production of prestressed reinforced concrete beams
Prestressed reinforced concrete products
Prefabricated reinforced concrete structures and prestressed concrete structures are the basis of modern building construction.
Prestressed concrete products, unlike the non-prestressed ones, have a whole range of advantages.
During the manufacturing process, high-tensile rebar or a steel tendon is tensioned, which causes prestressing (i.e. stressing before service load)—it stretches the rebar and contracts the concrete. It makes it possible to:
- increase crack resistance and life span of the structure;
- improve elastic properties of structures (concrete products resist compression and deflection well);
- use (up to 40–50 %) less steel and make the structure lighter;
- use structures for large spans rationally and efficiently;
- make the building safer, because the collision will be preceded by extreme deflection, etc.
A line for the production of prestressed reinforced concrete support beams includes:
- A set for a steel tendon or rebar tensioning (an abutment and an abutment which allows rebar releasing);
- A set of sides for the production of reinforced concrete support beams;
- A pallet and a side-moving mechanism (with mechanical, electromechanical, or hydraulic drive);
- Length cutters.
A line for the production of prestressed reinforced concrete support beams
M-Konstruktor manufactures sides for the production of prestressed reinforced concrete support beams. Together with rebar stressing abutments (you can also order those from us), they form a set for the production of prestressed reinforced concrete products.
The standard length of a set is 12.5 m. It is suitable for the production of a 12 m beam. If you need to manufacture several concrete products at once, you can assemble the sides into a single production line or a single structure. It will allow you to get longer products with a length of 24 or 36 m.
The section of a concrete product may vary in width due to the wide range of motion of the sides—up to 1 m (this value may be increased at your request). The height section of the beam may be changed by pouring less concrete in a mould or by application of a special insertion mounted on the stationary bed. The standard height section of the beam is 1,100 mm (the height may be changed according to the customer’s request).
At your request, we can manufacture sides in segments with a length of 1, 2, or 3 rm, which will enable you to quickly and easily readjust the mould to get a concrete product of a required section.
Moreover, the sided can be equipped with special insertions that make the section of a concrete beam narrower in specific places.
Production of prestressed beams with the help of a set of sides by M-Konstruktor
To reinforce the concrete, steel tendons are pulled from one side of the mould to the other one with the help of tensioning abutments. The tendons are tensioned with the help of a hydraulic jack. Then the concrete mixture is poured inside the mould. When the concrete gains the required strength, steel tendons are slowly released. In this case, the reaction force from the tension of the tendon/rebar is initially transferred to special abutments, and after pouring and consolidation of the concrete, the tensioning devices are released, and the rebar/tendons contract and transfer compressive strength to the concrete. After that, the finished concrete product is safely demoulded and sent to the warehouse.
The production of prestressed structures requires particular precision. For example, if you fill the ducts with cement mixture in the wrong way, this will lead to rebar corrosion and the reduction of the structure’s strength and durability.
Today, the most popular way to tension steel tendons is the tensioning of each separate tendon with the help of hydraulic jacks; the reaction force from such tension is transferred to abutments, which M-Konstruktor also manufactures.
Cost of production and delivery
Delivery is available throughout the territory of European Union and Eurasian Union countries and other countries. Shipment is available in different ways: by railroad, by heavy trucks, by sea.