Formwork for fencing is a system of elements that create a strong, impermeable framework that allows the erection of reinforced concrete structures. Formwork itself can be of several types: wall( for vertical surface), ceiling( for horizontal structures), architectural( for creating complex elements of structures), vertical( creating inclined surfaces).
Home formwork under the fence is required to meet several requirements: to ensure smooth edges of the future concrete, to withstand increasing mass and not bend at the same time.
Do not forget that it should be easy to install and also easy to remove. Professionals use expensive options, and houses can make formwork from simple boards, sheets of metal or thick plywood. Everything depends on the height of the required base above the ground.
It is important not to rush and install reinforcement elements as often as possible. It is advisable to select in advance the boards for reinforcement, boards for b
Reinforcing bars are desirable to take a cross-section of 50x50 mm, the size of the ligament boards ideally looks like 50x20 mm, but others will do. Also lay plywood, dense, without cracks or bends. Suitable plywood width of 1.5 cm and above, with a finer possible problems.
Having decided to make the formwork with your own hands, you save a decent amount of personal funds. After preparing the main material( boards and plywood) you need to determine the size of the future concrete. Suppose that it rises 30 cm above the ground, and its width is 20 cm. Determine the depth, in the case of the formwork it is not so important.
Next, draw a line with a thread or shovel the boundaries of the future fence. After that we can proceed to the installation of the formwork. The first thing we do is fixing bars. They lie down vertically, go deep into the earth for at least 50 centimeters, and they must rise at least 40 centimeters above the ground.
These bars are located every 120 centimeters on one side, and from the opposite we drive them in such a way that they lie down in the middle of two alreadyinstalled on the other side. Thus, the distance between two opposite bars is 60 centimeters. Slight distortions and mismatch - it does not matter, the main thing is a sturdy construction.
It's time for the plywood, we cut it so that in height it had no more than 40 centimeters. As for length, the more - the more convenient. Using a screwdriver and screws, we mount the plywood so that there is no gap between the bottom of the sheet and the ground at all, or make it minimal. Strongly tighten the fasteners is not necessary, under the weight of concrete everything will fall into place.
Naturally, the plywood is fastened from inside the pit, and the bars will be located behind the sheet. This gives us the most even sides. We do not hurry both internal and external formwork.
After installing the supporting bars and fixing the plywood on them, using boards of 50x20 mm we fasten the bars together. It is done this way: by a wide plane downwards on two opposite bars we establish a board and under a bias of 45 degrees on each side we screw two screws. This must be done, because we need to get concrete with even sides. Installation has come to an end, you can proceed to pouring.