The formwork (template) in the concrete structure is used as a mold for the structure in which fresh concrete is just poured for subsequent hardening. The type of concrete formwork structure depends on the type of formwork material and structural elements.
The formwork can also be named according to the type of structural member structure, such as a formwork for slabs, a beam formwork, a column formwork for beams and columns, and the like.
The construction of the template takes time and costs up to 20% to 25% or more of the structural cost. These temporary structures are designed for economic expenses. The operation of removing the template is called stripping. The stripped template can be reused. The reusable form is called the panel form, and the unusable form is called the static form.
Wood is the most commonly used material for stencils. The disadvantage of wood templates is that they warp, swell and shrink. The application of water imperviousness to wood surfaces mitigates these deficiencies.
A good template should meet the following requirements:
It should be strong enough to withstand all types of death and live loads.
It should be rigidly constructed and effectively supported and supported in the horizontal and vertical directions to maintain its shape.
The seams in the formwork should be tight to prevent leakage of the cement slurry.
The construction of the formwork should allow the various parts to be removed in the desired order without damaging the concrete.
The material of the template should be inexpensive, easy to obtain, and should be suitable for reuse.
The template should be precisely set to the desired line and the level should have a flat surface.
It should be as light as possible.
The material of the template should not warp or deform when exposed to the component.
It should build a solid foundation.