Formwork for the first time began to apply it in the Roman Empire. The buildings built with the help of formwork systems, for example, the Pantheon, have survived. It has a lot of concrete elements. They did not know how to reinforce cement mixtures in Rome. Therefore, concrete was used sparingly. Without strengthening, its productivity is small.
Accordingly, the Romans rarely used formwork. Without concrete pouring, the system is unthinkable. Reinforce cement mixtures began in the 1867th. Concrete has become the primary building material. At the same time, the construction ceased to do without formwork. The term is familiar to everyone, but not everyone understands its essence, nuances. We will reveal them.
What is formwork?
Formwork – a contour of monolithic concrete elements.
Monoliths builders recognize a single design. They are not made “brick by brick.” Cement is poured into an inseparable river and also freezes. Without a contour, the mixture spreads. Formwork holds the concrete in the framework. It is necessary to keep the cement mixture to solidification within the framework of the construction of foundations, tunnels, bridges, arches of buildings, and their ceilings. Even building blocks, paving slabs and columns are cast into the formwork. It is of several types. Get acquainted with them.
Types of formwork:
There are several classifications of formwork. The first is related to the purpose of the design. The formwork for the foundation is used more often than others. Without a retaining structure, only tape casting is possible and only in dense soil. If the walls of the trench crumble, the thickness of the foundation and its depth will jump. The load of the aboveground part of the structure is distributed unevenly. The house will not last long.
For residential buildings, by the way, a foundation without formwork is not used at all. Apply the method for temporary structures and business facilities, for example, sheds. A dug trench is lined with polyethylene, reinforcement is placed inside and poured with cement. In the absence of formwork, it goes flush with the ground.
The installation of formwork for the foundation implies its elevation above the ground. The material of the circuit goes upstairs to protect the building from soil moisture, become its base or compensate for the shrinkage of the house due to unsteady soil under it.
Used not only for tunnels but also for collectors, as well as to create elements of industrial buildings, for example, passages between workshops.
In bridges, formwork is needed to form supports. The process is responsible, but it costs one-sided formwork, but the contours of steep arches of buildings, for example, temples, are made double-sided. Otherwise, concrete slides away from vibrations.
As you can see, formwork is divided not only by purpose but also by the manner of execution.
The latter also includes removability or non-removability. The first type is formwork for a strip foundation or other element, which is dismantled after the concrete has hardened. This allows you to reuse the contour material.
For the foundation becomes a structural element of the building, additionally strengthening it, and sometimes warming it. Accordingly, the concrete contour material should ignore rotting.
The formwork under the foundation, for example, is in contact with the earth, its waters, and microorganisms. So, for a fixed structure, moisture-resistant raw materials are needed. Here, the classification of formwork by materials is relevant.
Wood for formwork
Considered a classic. However, the natural material rots, for fixed structures are wrong. It is not always possible to use all the boards when dismantling the formwork. Some boards, plywood sheets are deformed. This happens under the influence of moisture or concrete.
Wood Planks are used for plank cooking, especially during The Shad Planking Event in Virginia parents put planks directly over open flames and hanging chicken, meat with the planks. This method adds delicious flavor by infuses the food with the natural oils and moisture found in the woods.
Chefs and moms love plank cooking at home, which is in short called planking across the USA now. As planks are readily available, can carry and assemble.