Extensible plastic pillar formwork

Abstract

 This invention is to be used in Pillar formworks and is made from plastic material composed of two different parts. The exterior formwork and the interior called as a wrapper(8). This part is to be used only once and is in direct contact with concrete. The interior formwork(3-4-5)do not need to be oiled and cleaned after the dismounting.
It has the characteristic to be extendible to form square(1) or rectangular(2) sections. It can also be round section.

Description

[0001] With this invention we pretend to give the market a better, practical and cheaper formwork for the traditional pillar formworks used in iron and wood.

[0002] Due to its texture in plastic it becames light and the collocation is very easy and practical indeed.

[0003] More than that, this invention is very versatile because it permits the easy extension of the formwork because of the modules (3) from where we can get rectangular or square sections when added to the standard (5) modules wich have allways the same measure. That means that there is allways a standard part and the extensive modules wich are used in rectangular or square pillars. For the round sections the formwork must be made one for each diameter because the parts are fixed and can not be extended.

[0004] Until now the traditional pillar formworks (in steel or wood) are in direct contact with the concrete and should be previously oiled and well cleaned latter on when the job was finished. They are very heavy, they are difficult to collocate and transport and the price is very expensive.

[0005] In this invention, the formworks, because they are very light and because the concrete is not adherent to plastic they are of very easy building and dismounting and anybody can do it even if it is not a technic worker. Due to we said before they don't need to be oiled or cleaned.

[0006] We should say that rigorously this is composed by two formworks(one exterior (5-4-3)- the real formwork and one interior(8) - a thin piece of plastic - wich we are going to call a wrapper).

[0007] This interior wrapper is very important because it has the specific functions of isolating the exterior formwork from the contact with concrete and of giving the surface pillar the final polish appearance. This final air permits the direct paint.

[0008] This wrapper(8) is, of course, very cheap and is used only once.

[0009] To prevent the dynamic forces of compression in the lateral walls the exterior formwork is provided of "ribs"(11) wich gave the formwork a better resistance and allows the collocation of vertical irons(7) wich are directed to small mortar(10) previously imbibed in the floor concrete. This also allows the formwork do not move while the concrete is droped in.

[0010] The already above mentioned forces of compression, mostly in the Iarges pillars, will be annulled by 3 or 4 metalic girdle(12) disposed along the formwork. and against the vertical irons(7) wich oppose the necessary resistance

[0011] The Fig 3 represents a pillar formwork for a square section. If we want to pass it for a rectangular section we only need to substitute the modules(3-5) in two parallel walls for other, availables, measure.

[0012] The Fig 2 represents a circular pillar formwork. To change the measures we need to got other modules(5) in different measures. This formwork is also formed by an interior wrapper(8).

[0013] The Fig 5 represents a perspective of a finish pillar with the wrapper (8).

[0014] In the Fig 4 we can see a part (10) for the pillar bracing where the irons(7) comes in and the the Fig 4-A we can see the small mortar(10) imbebed in the floor concrete.

[0015] In the Fig 1 we can see a pillar formwork with ribs(11) and vertical iron(7) and the small mortar(10). Longitudinaly we can see a metallic girdle(12).

[0016] Fig 6 pretend to be a non special formwork for special cases when we need to make simultaneosly the beam and the pillar. It's made by horinzontal elements (13) wich are closed by some vertical irons passing into rings to allow the horizontal dismount.

INDEX

[0017] 

1-SQUARE SECTION

2-RECTANGULAR SECTION

3-EXTENDIBLE ELEMENTS

4-ROTULAS

5-STANDARD ELEMENTS

6-RINGS

7-VERTICAL IRONS

8-WRAPPER (INTERIOR FORMWORK)

9-ROUND SECTION

10-SMALL MORTAR

11-VERTICAL "RIBS"

12-METALlC GIRDLE

Claims

1. Plastic formwork for concrete pillars wich has th particularity of being an alternative of the iron or wood formworks. It's made of elements(5) wich assembled together can make a square(1) or rectangular(2) or circular section. They can be extensive (3) by a lattice (4) or by rings(6) depending of the formwork. They can be crossed by iron parts(7) permiting the perpendicularity. This formwork is composed of the exterior formwork and of the interior formwork, a thin plastic wrapper (8) wich is transported in a planning way and assembled in local. This interior wrapper is very important because it has the specific functions of isolating the exterior formwork from the contact with concrete and of giving the surface pillar the final polish appearance. This final air permits the direct paint.

2. In accordance with point 1 this formwork is characterized because is made in plastic material.

3. Due to the interior wrapper this formowork does not need to be oiled or cleaned.

4. Because of his texture it is very light, of easy colocation and transport.

5. It also charectrized because of the characteristics mentioned above and because of the texture it permits gains of time working with less workers.

6. Due to his texture and because the concrete do not touch the walls it permits a quicker dismounting.

7. It also charectrized because it gets a perfect perpendicularity because of the irons(7) and small mortar(10) previously imbibed in the floor concrete.

8. This formwork permits to annul the forces of compression, mostly in the larges pillars, by 3 or 4 metalic girdle(12) disposed along the formwork and against the vertical irons(7) wich oppose the necessary resistance.

Drawing