The formwork systems which are utilized in buildings shall be as given in 6.1 to 6.5.
6.1 Tunnel Form
This is a system which casts walls and slab monolithically in a single pour of concrete. Façade walls are precast or of block masonry to enable removal of tunnel form. All components of the formwork are made up of steel. This produces very rapid construction in a building where the plans are of modular nature suitable for this technology. Accelerated curing, if required, is possible enabling early stripping of formwork.
6.2 Slipform
Slipform is a continuously moving form at such a speed that the concrete when exposed has already achieved enough strength to support the vertical pressure from concrete still in the form as well as to withstand nominal lateral forces. Slipform may be classified as straight slipform, tapering slipform and slipform for special applications. Construction of lift cores and stairwell using slipform technique comes under special applications because of their complex sizes, shapes and loads to be lifted along with the slipform like walkway truss, etc, which is essential for construction. This system uses hydraulic jacks avoiding crane for lifting of assembly during construction operation. This system facilitates rapid construction and continual casting, creating a monolithic structure thereby avoiding construction joints.
6.3 Aluminium Formwork
This system of formwork uses modular aluminium panels, which are light and rust free, in both sheathing and framework. It may be used for a broad range of applications from wall to slab construction panels to more complicated structures involving bay windows, stairs and hoods. Every component is light enough to be handled easily thereby minimizing the need for heavy lifting equipment.
6.4 Large Panel Shuttering System
This is a system, which gives an advantage of combining speed and quality of construction. The vertical load
carrying members are made of steel whereas the horizontal members are of plywood inserted into two wooden beams thereby forming a web flange. All the formwork and support systems shall be designed for the loads coming during the actual execution stage.
6.5 Other/New Systems
Any other/new system may be used for systems building after due examination and approval by the Authority.