Circular formwork made of cardboard, metal, plywood and Styrofoam with their hands

Sometimes you need to make a round formwork, for example, for a semicircular porch, the foundation for the house, gazebo and so on. D.

Many reject the idea. They think that it is quite difficult to perform with his own hands. Nothing difficult in it, just there are some nuances to this work. The streamlined circular shape gives the whole structural strength and durability.

To create a circular base need formwork. It should be durable and flexible. Thin boards are not recommended. Under the weight of the concrete they will break. Planks impossible to bend. There are a few ideas to get round formwork.

Metal

Galvanized steel strip can be bent in a semicircle. The metal is used in large-scale construction projects. Connect the sheets using a power screwdriver. This robust design.

Deepen cleared under the base portion at 70 cm. At the bottom is laid macadam and sand (layer 25 cm.).

To save on the rubble, you need to use any construction waste: the pieces of bricks, clay, stones and so on.

Densified layer. Hammered pegs on the base circuit. Use of reinforcement rods with a diameter of 10 cm. Then make the grout.

Plywood

Some do shuttering plywood. The material allows the output to get a clear and smooth concrete surface. But it is quite a difficult process, as the material is not so good is flexible to bend it.

Therefore, taking the sheets of material of small thickness. But in advance of the installation of the formwork, bent plywood (soaking it or slotted). Less use of plywood: complexity, additional training, and high cost.

Cardboard

You can make the formwork from the usual cardboard, but with one condition. It is necessary to enhance the use a metal mesh. For example, it is necessary to fill the round column. Take the steel mesh and turn to obtain the required diameter. Edge seal wire or by welding.

Inside the grid to place the folded cardboard. Cardboard pieces can be fastened together with adhesive tape. After solidification of the concrete, the formwork is removed from the board.

Expanded polystyrene

Enough strong material. First, the desired cut size sheets. Connect them using a conventional adhesive tape.

The material is not very good holding the correct shape of a circle. Therefore, make additional struts of the bars.

It is often required to make the formwork under the well cover. It is from this material it is easier to perform. Install the hatch on the base. On the reverse side of the hatch there groove. They need to insert and 2 cm. polystyrene sheets. Cut 3 pieces in size and inserted into the slot in the hatch. Sheets wrapped tape.

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