Patent Application
20200173183
The present invention generally relates to a construction device and system and particularly relates to a slab formwork system with modular assembly having panels covering larger areas with multidirectional erection possibilities, fast efficient and highly productive.
In the construction of concrete buildings, it is known to employ, for the casting of ceilings, a slab formwork comprising panel support beams mounted on shores and panels supported on the panel support beams. It is further known to provide the shores with dropheads, which support the beams and which also have heads projecting between the panels. In use, after a concrete slab has been cast on the panels and the concrete of the slab has sufficiently hardened, parts of the dropheads carrying the beams and panels can be released for movement downwardly relative to the shores, thereby allowing the beams and the panels to the withdrawn downwardly from the newly cast concrete. The dropheads along with the shores remain in position to support the concrete.
Various prior art techniques and systems have been developed to provide quick shuttering and de-shuttering. One of such prior art discloses a slab formwork system for casting ceilings has panel support beams underlying and supporting formwork panels; and shores supporting the panel support beams. The panel support beams have upwardly facing top surfaces with upwardly open, longitudinally extending recesses and resiliently deformable strips of elastomeric material extending along the recesses. The formwork panels having marginal edge under surface portions mounted on the panel support surfaces and downwardly protruding panel retainer projections embedded in the resiliently deformable strips. The formwork panels each have a pair of parallel, elongate intermediate members extending between and interconnecting parallel elongate side members and a sheet of material supported on the side and intermediate members, and the side members have undersides formed with a longitudinally extending, downwardly open recesses. Connecting clips retained in the downwardly open recesses are engaged with the support beams to secure the formwork panels to the support beams. The panel support beams are telescopically longitudinally adjustable to allow corresponding variation of the spacings of the shores which have dropheads each having a first component forming a prop head extending between an adjacent pair of the formwork panels and a second component in supporting engagement with the formwork panels. The first and second components have mutually engaged screw threads allowing the second component to be lowered relative to the first component for releasing the formwork panels.
However, the prior art systems use props and drop head that demands a set of equipment and an experienced labour for shuttering and de-shuttering. This increase a time for installing and de-installing a formwork and hence, increase an installation and de-installation cost to a large extent.
In the view of foregoing, there is a need for a modular slab formwork system with a quick shuttering and de-shuttering assembly. Also, there is a need for a slab formwork system with rigid and shock-resistant panels and a drop head adapted to enable stable and fast installation of the formwork.
The above-mentioned shortcomings, disadvantages and problems are addressed herein, as detailed below.
A primary objective of the embodiments in the present invention is to provide a modular slab formwork system with a quick shuttering and de-shuttering assembly.
Another objective of the embodiments in the present invention is to provide a slab formwork system with rigid and shock-resistant panel and a drop head adapted to enable stable and fast installation of the formwork.
Yet another objective of the present invention is to provide a slab formwork system with multiple side shuttering that allows faster installation.
These and other objects and advantages of the embodiments herein will become readily apparent from the following detailed description taken in conjunction with the accompanying drawings.
The various embodiments of the present invention provide a modular slab formwork system with easy shuttering and de-shuttering assembly. The formwork system comprises a formwork panel, a drophead and a prop. The formwork panel comprises a plurality of side connectors, a base frame, and a form-lining. The base frame comprises a corner element on each corner. The base frame has a chamfered corner with a slotted window and a bottom rim. The drophead is hooked to a slotted window of each corner element. The corner element facilitates locking of formwork panel with the drophead. The prop creates a vertical support to the formwork panel through the drophead over a ground surface.
According to one embodiment of the present invention, the drophead comprises a top plate, a fly plate, a wedge, a stem, a bottom plate and a locking bolt. The bottom rim of the corner element along with the drophead facilitates self-aligning of the formwork panel with the drophead.
According to one embodiment of the present invention, a base plate of the prop is connected to the bottom plate through the locking bolt. The stem is fixed at a central axis of the bottom plate and further connected vertically to the top plate respectively.
According to one embodiment of the present invention, the base frame is chamfered at an angle range of 40°-50° and at a preferable angle of 45° leading to a connection with a top plate of the drophead. The corner element slides into a fly plate of the drophead creating a locking action.
According to one embodiment of the present invention, the wedge has dual action of successive detachment of formwork panel by releasing the locking followed by gravity-based dropping of fly plate.
According to one embodiment of the present invention, the wedge comprises a side guiding and an inner slopping level. The fly plate is interlocked with the wedge through the side guiding.
According to one embodiment of the present invention, the fly pate comprises a fly plate pin hinged to the corner element. The fly plate pin is unhinged by applying a lateral force on the wedge leading to an angular movement of the fly plate through the inner slopping level.
These and other aspects of the embodiments herein will be better appreciated and understood when considered in conjunction with the following description and the accompanying drawings. It should be understood, however, that the following descriptions, while indicating preferred embodiments and numerous specific details thereof, are given by way of illustration and not of limitation. Many changes and modifications may be made within the scope of the embodiments herein without departing from the spirit thereof, and the embodiments herein include all such modifications.
The other objects, features and advantages will occur to those skilled in the art from the following description of the preferred embodiment and the accompanying drawings in which:
In the following detailed description, a reference is made to the accompanying drawings that form a part hereof, and in which the specific embodiments that may be practiced is shown by way of illustration. The embodiments are described in sufficient detail to enable those skilled in the art to practice the embodiments and it is to be understood that the logical, mechanical and other changes may be made without departing from the scope of the embodiments. The following detailed description is therefore not to be taken in a limiting sense.
With respect to
According to one embodiment of the present invention, the wedge has dual action i.e. if hammered in an opposite direction, the wedge releases the locking of the corner element from the fly plate pin followed by the gravity based dropping of panel and fly plate along with the wedge.
According to one embodiment of the present invention, a shuttering method of the slab formwork comprises the steps of:
According to one embodiment of the present invention, a de-shuttering method of the slab formwork comprises the steps of:
According to one embodiment of the present invention, the props remain in place during the formwork stripping process thereby ensures faster slab cycle.
According to one embodiment of the present invention, the props having ground clearance of up to 5 m is possible using PERI props while the present prop is also compatible with various locally developed props if designed as per the PERI loading charts.
The present slab formwork allows a rapid shuttering and de-shuttering process using a less quantity of labour. Also, the chamfered corner of the formwork panel and the corner element allows self-centering and locking of the formwork panel into the dropheads without requirement of hammering, thus reducing a labour cost and complexity in assembly. The flyplate and wedge of the drophead provides locking of the corner element in position during the shuttering process and also, the dual action wedge ensures the release of corner element providing a safe deshuttering process ensuring detachment of panel during gravity drop of the fly-plate.
The slab formwork facilitates re-usability for upto 500 times due to rigid metallic base frame and minimum requirement of infills leading to less rupturing of the formwork panels.
It is to be understood that the phraseology or terminology employed herein is for the purpose of description and not of limitation. Therefore, while the embodiments herein have been described in terms of preferred embodiments, those skilled in the art will recognize that the embodiments herein can be practiced with modification within the spirit and scope of the claims.
| Number | Date | Country | Kind |
|---|---|---|---|
| 201841045177 | Nov 2018 | IN | national |
