Roof and Slabs

Production Lines for Roof and Slabs

 

 

Long Lines for the production of pre/stressed elements of particular shape, that cannot be reached on a “general purpose” Prestressed production line.

 

These equipments are self-supporting. It means that they integrate the stressing heads into the mould. At one end will be the passive head, whose function is only to retain the pre-stressed cables, while in the other end is the active head. The active stressing head incorporates slackening jacks which allow a controlled release of tension of the cables before these are cut after the curing of the concrete.

 

Any coupling between tables moving parts is equipped with rubber gasket in order to avoid concrete leakages. The gasket that can be conceived either underneath the casting surfaces, with metal chamfer bolted on the casting plates, or welded on the shuttering, with special shape (GF type) that guarantees the presence of the chamfer in the rubber itself.

 

Moulds can include a vibration system consisting of a series of vibrators that can be electric or pneumatic. The vibration compacts the concrete by removing air and increases its mechanical strength after curing. Furthermore, vibration allows using concrete with less moisture and accelerates the curing process, in order to increase productivity. Click on this link in order to examine all the range of Bianchi product in vibration for prefabrication.

 

The heating system of the mould also increases productivity by accelerating the curing process. This system consists of a series of finned pipes positioned under the mould and/or in the lateral sides where hot water or industrial steam flows at the pressure of 4-5 bar. All the lateral sides can be covered by isolation canvas or plastic panels.

 

Essential equipments in a prestressing lines are the hydraulical units and jacks that allows the tensioning of each single strand, and the detensioning of all the line in a single stroke. All Bianchi range of these machines is available at this link 

 

TT mould

 

It allows the casting of slabs with double pre-stressed ribs. These double T beams can be used both as a structural element supporting slabs concreted on site or as a roof element.

The typical slab width is 2,4 meters but also wider versions are available. Bianchi can supply moulds with a fixed shape, where it’s possible to change the rib height with the insertion of rises and the slab width with the deplacement of a lateral side.

In alternative, it’s available the completely hydraulical version, where all the dimensions of the element can be changed in few minutes acting on the levers of the central unit. In addition, the lateral sides of the mould can be opened in order to assure an easy access to the internal parts

 

Wing Shaped Elements “Fly”

 

The mould is usually made by

  • a lower channel produced in steel plate, reinforced by other press-bended steel plates and beams, laid and fixed on vibration absorbers
  • a self-resisting structure and a pair of perforated steel beams with the de-tensioning cylinders
  • an upper mould made of steel plate reinforced by other plates; this part can be either moving by the overhead crane or hydraulically lifted up turning around a hinge.

This type of element often has bevelled surfaces. As a result, close attention should be paid to formwork production process, particularly with regard to the counter casting surfaces.
 

I Beam with “gutter” function

 
The mould is made by

  • a lower channel produced in steel plate, reinforced by other press-bended steel plates and beams, laid and fixed on vibration absorbers
  • a self-resisting structure and a pair of perforated steel beams with the de-tensioning cylinders
  • Hinged lateral sides that can be opened both hydraulically or manually
  • Upper buffer for the manufacture of the “gutter” in the I beam element. Deplacement of the buffer can be both manual or hydraulical