What is a coffered slab?
Coffered slab is a ribbed structure with reinforced ribs in the lower zone which have mutually perpendicular arrangement.
What is coffer formwork?
Coffor is a lightweight, structural stay-in-place formwork system used to build reinforced concrete walls. It is composed of two filtering grids made of rib lath and reinforced by C-profiles. The grids are attached to each other with articulated rebar connectors.
Where is coffer slab used?
Benefits of Waffle Slab Construction
Waffle slabs are used for larger span slabs or floors and used when there is limited requirement for number of columns. The load carrying capacity of waffle slab is greater than the other types of slabs. They provide good structural stability along with aesthetic appearance.
How is a waffle slab constructed?
The construction process involves a building system of concrete slabs that are shored up by columns. The monolithic poured concrete will form a flat top surface while the rectangular grids form deep concrete beams on the underside, with the beams resembling waffle pockets spread out at right angles.
What is the purpose of coffers?
coffer, in architecture, a square or polygonal ornamental sunken panel used in a series as decoration for a ceiling or vault.
What is the purpose of a coffered ceiling?
A coffered ceiling is a series of indentations or hollows on the surface of a ceiling. Coffered ceilings decoratively hide ceiling imperfections and create the illusion of height. Historically, the design is considered dignified and formal.
What are 2 types of formwork?
Types
- Traditional timber formwork. The formwork is built on site out of timber and plywood or moisture-resistant particleboard.
- Engineered Formwork System.
- Re-usable plastic formwork.
- Permanent Insulated Formwork.
- Stay-In-Place structural formwork systems.
- Flexible formwork.
What is slab formwork?
Slab formwork can include formwork panels, joists, stringers, and other supports that allow concrete to be poured and suspended above the ground. Such formwork often combines a variety of materials, including metal, plywood, and in some cases even plastic components used to give concrete its shape and strength.
What are the different types of slabs?
What are the 16 different types of slabs in construction?
- One-Way Flat Slab.
- Two-Way Flat Slab.
- Kitchen Slab.
- Sun Shade Slab.
- Lintel.
- Sunken Slab.
- Cable Suspension Slab.
- Pre-Tension Slab.
What is the disadvantage of waffle slab?
Disadvantages of Waffle Slabs
Waffle slab was not used in conventional construction projects. Its is expensive, so it is only economical when large scale production of similar units is desired. Construction requires rigorous supervision and skilled labour.
What is the purpose of waffle slab?
A waffle slab is a type of slab with holes underneath, giving the appearance of waffles. It is usually used where large spans are required (e.g auditorium) to avoid many columns interfering with space.
Do waffle slabs crack?
Waffle slab construction gets a lot of flak within the industry as they have been linked with severe cracking in houses in recent years. However, just like any tool, there are certain circumstances in which they are the better option.
Which is a feature of coffer?
A series of these sunken panels was often used as decoration for a ceiling or a vault, also called caissons (“boxes”), or lacunaria (“spaces, openings”), so that a coffered ceiling can be called a lacunar ceiling: the strength of the structure is in the framework of the coffers.
What is the major purpose of coffered ceilings?
Coffered ceilings use a series of beams to create the look of sunken panels on a ceiling. Although their primary purpose is generally ornamental, they may have practical purposes, such as lessening ceiling load, covering up wavy ceilings or improving acoustics.
How do you frame a coffered ceiling?
How to Build a Coffered Ceiling | This Old House – YouTube
What is a coffer in construction?
coffer, in architecture, a square or polygonal ornamental sunken panel used in a series as decoration for a ceiling or vault. The sunken panels were sometimes also called caissons, or lacunaria, and a coffered ceiling might be referred to as lacunar.
What are the 6 types of formwork?
What is the best type of formwork?
Steel forms are stronger, durable, and have a longer life than timber formwork and their reuses are more in number. Steel forms can be installed and dismantled with greater ease and speed. The quality of exposed concrete surface by using steel forms is good and such surfaces need no further treatment.
What is formwork and its types?
Types. Formwork may be made of wood, metal, plastic, or composite materials: Traditional timber formwork. The formwork is built on site out of timber and plywood or moisture-resistant particleboard. It is easy to produce but time-consuming for larger structures, and the plywood facing has a relatively short lifespan.
What is beam and slab formwork?
What is the formwork used for beam and slab? The used formwork for beam and slab is a type of formwork that can be used to create two columns or walls. In this method of formwork, the lower part and the panels are used as walls. For more strength of the wall, horizontal and vertical backrests are used.
What are the three types of slab?
Generally, slab on grade is classified into three types:
- Slab on ground.
- Stiffened raft slab.
- Waffle raft slab.
What are the 3 types of slab foundations?
3 Types of Concrete Foundations – Slab on Grade, T-Shaped, Frost Protected – Concrete Network.
Why waffle slab is the best slab type?
The waffle slab floor system has several advantages: Better for buildings that require less vibrations – this is managed by the two way joist reinforcements that form the grid. Bigger spans can be achieved with less material, being more economical and environmentally friendly.
Is waffle slab strong?
Strong Structural Stability
If you are looking to create a strong structure that can go for decades without showing any signs of damage, waffle pod slabs are the way to go. This system features greater stiffness and strength compared to conventional footing methods. It offers greater resistance to cracking.
What are the disadvantages of waffle slab?
The disadvantages of waffle slab are as follows:
- Require greater floor-to-floor height.
- Requires special or proprietary formwork which is costly.
- requires strict supervision and skilled labor.
- Difficulty in maintenance.
- Not suitable in highly windy area.