초록 ▼

Tensioning installation for the frameworks of pre-tensioned architectural elements designed for the two-way pre-tensioning of concrete or mortar plates, or the like, comprising a molding assembly made up of a flat molding plate (3) delimited on the perimeter by adjustably positioning side walls (4).

Tensioning installation for the frameworks of pre-tensioned architectural elements designed for the two-way pre-tensioning of concrete or mortar plates, or the like, comprising a molding assembly made up of a flat molding plate (3) delimited on the perimeter by adjustably positioning side walls (4). The assembly rests on an oversized support platform (1)on which the molding assembly is surrounded by a perimeter area (10) of support platform (1) proper, in which perimeter area (10) hydraulic tensioning devices (7) are provided, which are integral to support platform (1) and are arranged in juxtaposition forming opposite facing pairs according to rectilinear alignments forming a grid. Said hydraulic tensioning devices (7) are all connected together serially forming a hydraulic circuit (8) which, in turn, is connected to a hydraulic pressure connection point (9).

대표청구항 ▼

The invention claimed is: 1. Tensioning installation for frameworks of pre-tensioned architectural elements, the tensioning installation being adapted for two-way pre-tensioning of concrete or mortar plates, comprising a molding assembly having a flat molding plate and adjustably positioned side wa

The invention claimed is: 1. Tensioning installation for frameworks of pre-tensioned architectural elements, the tensioning installation being adapted for two-way pre-tensioning of concrete or mortar plates, comprising a molding assembly having a flat molding plate and adjustably positioned side walls extending about and limiting a perimeter of said flat molding plate, the molding assembly being supported by a support platform having a perimeter area surrounding the molding assembly, and wherein a plurality of hydraulic tensioning devices is provided in said perimeter area in engagement with said support platform, the hydraulic tensioning devices being arranged in juxtaposition in opposite facing pairs thereof across the molding plate, each of the opposite facing pairs having a filiform element extending therebetween, with the filiform elements being arranged in rectilinear alignment so as to form a grid, each hydraulic tensioning device having a fixed portion mounted on said support platform and a mobile portion engaged with one end of the corresponding filiform element, the hydraulic tensioning devices being serially connected together to form a hydraulic circuit, with the hydraulic circuit being connected to a hydraulic pressure source at a connection point, the mobile portions of the hydraulic tensioning devices being configured to be responsive to application of hydraulic pressure to the hydraulic circuit to extend from the respective fixed portions and away from the molding plate to exert a tension on the filiform elements extending between each of the opposite facing pairs. 2. Tensioning installation according to claim 1, wherein the framework to be tensioned comprises a plurality of the filiform elements, said fixed portion having a fixed cylindrical body and an openable connection cap to said hydraulic circuit, and said mobile portion having a plunger body urged by a compression spring and extending into a rod having an anchoring part, the ends of said filiform elements making up the framework being anchored in the anchoring part, said anchoring part having two sliding rods configured to slide inside respective guides provided in said fixed cylindrical body. 3. Tensioning installation according to claim 2, wherein said openable connection cap of each hydraulic tensioning device has a transverse conduit configured to diverge into an axial conduit in communication with a pressure chamber of the fixed cylindrical body having the plunger body of the mobile portion of the hydraulic tensioning device sliding therein. 4. Tensioning installation according to claim 2, wherein, in each hydraulic tensioning device, said anchoring part for anchoring the ends of filiform elements making up the framework is pivotably mounted on a free end of said rod of the plunger body. 5. Tensioning installation according to claim 2, wherein, in each hydraulic tensioning device, said anchoring part defines grooves forming a retainer for heads of stoppers formed at the ends of said filiform elements. 6. Tensioning installation according to claim 2, wherein said anchoring part of each hydraulic tensioning device defines respective holes with clearance for articulately housing said sliding rods sliding along said guides of the fixed cylindrical body. 7. Tensioning installation according to claim 3, wherein said openable connection cap in communication with the pressure chamber of each fixed cylindrical body has opposing mouths of said transverse conduit, each mouth being provided with a connection mechanism, with respect to the hydraulic circuit, for connecting to the openable connection caps of adjacent hydraulic tensioning devices. 8. Tensioning installation according to claim 2, wherein said plunger body has a perimeter sealing gasket and defines a central hollow in registration with said axial conduit. 9. Tensioning installation according to claim 2, wherein said fixed, cylindrical body has a seat for said compression spring, wherein said compression spring urges the plunger body and a friction sleeve for the sliding of the rod of said plunger body. 10. Tensioning installation according to claim 2, wherein said fixed cylindrical body defines holes for passage of fixing screws for fixing said cylindrical body to the support platform. 11. Tensioning installation according to claim 2, wherein the support platform has centering arrangements for an auxiliary head for inserting complementary elements and for removal of the architectural element, once cured, from the molding assembly. 12. Tensioning installation according to claim 2, wherein said mobile portion of the hydraulic tensioning device pivotably mounts said anchoring part on said rod via a screw passing with clearance through a hole defined by the anchoring part, said screw being attached to said rod without pressing said anchoring part, thereby leaving said anchoring part to pivot about an end projection of said rod of the plunger body.