FR2608196A1 - Permanent formwork made of bendable metal elements - Google Patents

Abstract

Method of construction using metal prefabricated permanent formwork for vertical walls, characterised in that lathing 1 made of expanded sheet metal of small height is used, to the back of which there are welded spacer supports 2, 3 vertical stiffeners and possibly loop stiffeners, and U-shaped spacers 4 so as to form one or more compartments which can be juxtaposed or superimposed in relation to each other in a staggered configuration. Spacer supports and elements for fixing the formwork are also described.

Description

 Constructions are commonly carried out comprising a reinforced concrete or metallic frame and filling panels (formwork) or even precast blocks.

 Such a construction, by its very nature, requires relatively significant work on the site, which is currently sought to be eliminated as far as possible.

 For this purpose, the construction in light lost formwork, according to the present invention, is characterized in that the formworks are foldable, having a small height for example 0.415 m and a functional width, allowing construction by successive layers, without resumption of pouring vertical wall in heavy or light concrete.

 We can easily adjust the formwork that we just unfolded at the time of use and position it with a few concrete shovels inside to keep it stable.

 According to another characteristic of the invention, the formwork makes it possible to receive and place within it armatures, materials in an easy manner since visible behind the formwork, sheaths of (bright) colors, which form a diagram of an organization for example electric full-size and visual, facilitating the location - and the threading before the coating.

 This invention provides multiple advantages.

 In the specific case of a formwork for partitions to be filled, for example with light concrete, the advantages offered are the following - Build a very high number of square metersday.

- Let appear for example the electrical diagram behind the formwork.

- Provide thermal and sound insulation.

- Relieve floors of significant dead weight.

- Let pass the big movements of the buildings which seek their almost ultimate position.

- Eliminate the risk of weakening walls and partitions as well as cracks and fittings.

- Really bring the finished aspect by carrying out the finishing plasters later.

- Escape from the chore of gravel which penalizes the profitability of companies and order on the site.

- Build pre-pillars without heavy equipment, without embarrassment or hindrance on the site, allowing during filling the implementation of a very high number of m3 of concrete.

 In the case of double formwork, it makes it possible to obtain insulation from the outside without thermal bridge and sound insulation from the fact that no vacuum remaining inside can communicate the longitudinal mechanical vibrations improperly called "sounds"; this is valid for the monolith.

 The double formwork is said to be level, in fact the external compartment forms a formwork on the shore and that of the interior, a level and support to receive the floor. This remarkably suitable formwork eliminates the installation of planks or the installation of edge formwork boards with clamps which give the appearance of degradation and dissociate the masonry.

 The accompanying drawings, Figures 1 to 5, show by way of example an embodiment of the present invention.

 Figure 1: a partial view of a double formwork in perspective with a section of a vertical plane 6 and 7 concrete, a vertical stiffener 8, a transverse stiffener with loops 9.

 Figure 2: a sectional view shows the lattice 1, a W-shaped acc.eòire 2 said spacer support which is welded to the outside in the hollow of the ply of the lattice or an impression was made in order to obtain a strict position, and let the two wings of the support pass inward so that in the rare case of a faulty weld, it does not lose its location or miss its function.

 At the end of these wings, a median hole is used to position the bent part of the spacer allowing to pivot, the width of 3cm of the support avoids falling under the law of punching.

 A W-shaped accessory, called median and double spacer support 3 composed of four wings and four holes, allows the maintenance of two walls.

 Figures 3 and 4: a U-shaped spacer 4, the bent part is positioned in the holes of the two wings, allowing folding and spacing, a star-shaped washer 5 (REST CLIP), positioned on the part cubit of the spacer about lom deep compresses the two wings, preventing the spacer from coming out of its support and stops sloshing.

 Figure 5: stiffener with loops <ref. 9> overcomes possible bulges in the formwork by crossing right through the fresh concrete wall, so the loops protrude from the two opposite faces of the formwork and receive, for example, points which will keep both the lattice stable and the spacing which would leave the spacers 4 out of function, it is placed where it is necessary and ensures the maintenance and continuity of the filling.

 It is also placed in the part of the vertical stiffeners 8 which protrude by about 4cm from the top of the battens or formwork, it facilitates alignment and plumbs with the wall.

 The use of the lath with stiffeners and spacers makes it possible to form compartments which can be juxtaposed, or superimposed on one another in staggered rows.

Claims (5)

PEVENDICATIONS  1.- Method of construction in prefabricated metal lost formwork for vertical walls, characterized in that a lath (1) made of expanded metal sheet of low height is used on the back of which are welded spacer supports (2,3) , vertical stiffeners (8) to which loop stiffeners (9) and U-shaped spacers (4) fitted with knocked star washers forming a brake (5) are optionally added so as to form one or more compartments which can be juxtaposed or overlap each other in staggered rows.  2.- Method according to claim 1, characterized in that the laths folded for transport are unfolded on the site during implementation.  3.- vertical formwork elements used for the method according to claim 1, characterized in that they comprise vertical stiffeners (8) protruding by about 4cm the battens, constituting the vertical elements, on the back of which they are welded.  4. Elements according to claim 3, characterized in that the vertical stiffeners (8) receive transverse stiffeners with loops (9).  5.- elements according to claim 4, characterized in that single or double spacer supports (2 and 3) are welded outside in the hollow of the ply of the lath (1) in a location defined in advance , their wings directed inwards being perforated in the middle so as to position the bent part of the spacer and to allow its pivoting.