WO2010074550A1

WO2010074550A1 - Assemblage formwork

Info

Publication number: WO2010074550A1
Application number: PCT/MY2008/000197
Authority: WO
Inventors: Nan San Lee
Original assignee: Nan San Lee
Priority date: 2008-12-23
Filing date: 2008-12-30
Publication date: 2010-07-01

Abstract

A formwork may design as one piece of system form by metal or plastic moulding, with depress groove that may covers multi- directional angles on either side of sheet, provides for a light weighted, tough, strong and resilience all-weather solution to pre-cast and on-site casting of concrete structures. Based on a relatively thin sheet layer, the whole formwork is strengthened by depress grooves, extended right angle 'stiffeners' pieces and bending stiff frames, to withstand the weight of flowing concrete.

Description

Assemblage Formwork

Technical Field

This invention relates to a cheap, durable, light and easy to assemble formwork for the building industry.

Background Art

Formwork refers to the structure of boards that make up a form for pouring concrete in construction.

Conventional formwork comprises of wooden sheets (such as plywood) coupled with wooden beams. The beams provide the wooden sheets with extra strength desired, to withstand the weight of flowing concrete. The beams are either nailed or screwed to the sheets, where the beams usually lined in parallel and mostly running in one particular direction. Where it is deem necessary, extra beams running in perpendicular direction may be employed.

Due to lack of water-proof characteristic and the fact that its task is to contain wet concrete, wooden formwork is hardly durable. In general, wooden formwork can only be re-using three times. First time for area with plastering, third round covers underground area where appearance is not a valued factor.

Another common problem facing the wooden formwork is the threat of termites. As a result, it is not advisable for long term storage. Even exposure to sunlight and rain can result in unpleasant deformation. For underground formwork, wooden structures are particularly prone to high moisture level. Once softened and rotten, removing it can become so difficult that, sometimes it is left buried underground, and result in a more porous ground.

Steel formwork is also widely used. While very durable, it is difficult to get assemble, or modify. To avoid deformation caused by the pressure of flowing concrete, a thick layer sheet is required and beams/frames (usually in the same material) will be applied in one or more direction on the outer surface which, both results in a heavy weight. Heavy weight also means that it is most difficult to deliver and maneuver around.

Therefore, conventional steel formwork is more prefer for pre-cast production where manufacturing plant is stationary.

Disclosure of Invention

The present invention aims to provide a useful alternative to known wooden and steel formworks.

The conventional method in formwork design which uses to resist the pressure of concrete is made up from thick & heavy wooden/metal sheet and beams which create a very heavy weight formwork system.

By adopting the concept of Assemblage Formwork, thick sheet & beams are not required to resist the concrete pressure. This provides most advantages in cost effective and time saving in term of materials. The Assemblage Formwork can be moulding by steel, plastic or any other materials. The design of depress groove, extended right angle pieces and the bending stiff frame have replaced most of the conventional thick sheet and beams, thus overcome their side effect of heavy weight.

While conventional formwork is usually made by assembled parts of sheets and beams, Assemblage Formwork may design as one piece of system form by moulding which do not have any multi joints that can provide any leak while concreting. Furthermore this one piece concept reduces man power and assembly time.

Designs of Assemblage Formwork enable the uses of materials such as metal and plastic to become more practical in concrete moulding. By adopting metal or plastic materials, the Assemblage Formwork reuse cycle count will be far greater than conventional wooden formwork. In this case, its advantages also include water proof, weather proof, termite resistance and saving on mold lubricant oil.

Assemblage Formwork is environmental friendly. It can accommodate recycle-able metal/plastic materials of any kind. In comparison, conventional wooden formworks tend to get discarded, littered, or burned.

Assemblage Formwork is light and flat in designs with standard shape to ensure it's convenient in transport and storage.

Assemblage Formwork can be used for pre-cast or cast in~site (on- site casting) of concrete structures. The shape of depression groove on Assemblage Formwork will be left in the completed RC column/beam. The groove in the column will provide extra grip between column/beam and bricks wall. The groove in the column/beam will provide grip for plastering.

Description of Drawings and Best Mode for Carrying Out the Invention

In order that the invention may be more readily understood and put into practical effect, a preferred example of the invention will now be described with reference to the accompanying drawings/photos, in which:

Figure 3 illustrates a preferred example of an Assemblage Formwork which design as one piece of system form by moulding. Flat in size with a standard shape which occupy minimum storage space. Assemblage Formwork is ready to use after bending.

Referring to Figure 4 the depress groove as shown as P1 is one of the major concept in Assemblage Formwork design that act as a beam/frame in the convention formwork system which is able to resist the concrete compression. With this groove and the metal sheet as one, the design will provide a greater reduction in the thickness of metal sheet use without the beam/frame.

Dismantling of the formwork is much easier due to the bevel/arc angle chamfer/fillet (Figure 4/Figure 5, P2) preventing the concrete inside from trapping the sheet. Assemblage Formwork requires simply screw and nuts to join up (Figure 4, P3) make it less depends on skill worker yet reduces the installation time. The extended right angle metal/plastic pieces (Figure 4, P3) also act as stiffeners to prevent deformation. Hence, no additional steel beam or frame is required.

Assemblage formwork may design as one piece of system form by moulding which do not have any multi joints (Figure 4, P4) that can provide any leak while concreting. The additional advantage of this moulding system is the bending (Figure 4, P4) also provides a stiff frame to the formwork system.

The joint in a piece of Assemblage Formwork is sealing by rubber/polymers (Figure 4, P5) and tight in either screw, nail or lock bracket & pin to prevent leaking.

When using Assemblage Formwork for concreting, extra grip is provided in the construction of walls between the column and brick walls by the additional groove (Figure 6, P6) in the column where the groove act as the extra holder by the infill of cement mortal.

The depression groove (Figure 6, P6) in the column will provide grip for plastering of the column.

Figure 7 illustrates a preferred example of an Assemblage Formwork connected to an adjacent unit by using wood, nails, screws, or lock brackets & pins.

Claims

CLAiMS:

1. A formwork comprising steei/plastic/other moulding or the like, may designed as one piece of system form by moulding, with depress groove (Figure 4, P1) widely distributed on either side of the sheet, to provide for the desired strength against the weight of the flowing concrete.

2. The device of claim 1 characterised in that the depress grooves covers a significant portion of the surface area, on either side of the sheet.

3. The device of any one of claims 1 to 2 characterised in that the depress groove contains a depth, which enable it to act like a beam subject to compressive and tensile strength.

4. The device of any one of claims 1 to 3 characterised in that the depress groove profile may adopt various cross-sectional patterns, such as trapezoidal, semi-circular, "V" shape or the like that formed by bevel and/or arc angle (Figure 5, P2).

5. The device of claim 1 characterised in that the designed as one piece of system acquire a formwork shape and stiff frame (Figure 4, P4) by bending on the desired part of the sheet (Figure 3).

6. The device of any one of claims 1 to 5 characterised in that the designed as one piece of system adopt some extended right angle "stiffeners" pieces (Figure 4, P3) at the edge of formwork.

7. The device of any one of claims 1 to 6 characterised in that the designed as one piece of system include one or more layer of rubber/polymers seal or the like placed on the joining section of formwork system (Figure 4, P5).

8. The device of any one of claims 1 to 7 characterised in that grooves (Figure 6, P6) will appear on the reinforced concrete column/beam by using Assemblage Formwork.

9. The device of any one of claims 1 to 8 characterised in that the material used for this formwork exhibits the following characteristics: water-proof, weather proof, termite resistant, and recycle-able.

10. The device of any one of claims 1 to 9 characterised in that adjacent pieces of Assemblage Formworks may be joint together, using wood stick, nails, screws or lock brackets & pins.