How to make a formwork for foundation

Formwork is a pre-erected framework for the formation of concrete structures. Without it, it is impossible to make a ribbon foundation or a monolithic slab for the entire building. The quality of the constructed base depends on the execution of the rules and norms of the formwork.

The form for the construction of the foundation should provide sufficient rigidity and strength, protect the solution from soil and outer moisture, as well as prevent the output of water from concrete. There are several materials technologically suitable for these requirements:

Sheet metal;
Plastic sheets;
Moisture-resistant plywood;
OSP-3;
Boards.

Edged coniferous boards, due to a moderate price, are most commonly used when construing formwork in private construction. For making milking formwork, you will need:

Boards thick from 25 mm;
Bar 50x50 mm;
Nails from 60 mm long.

Bars are cut with the same segments - 0.5 m longer than the foundation height. The resulting stakes are sharpened from one end to scoring into the ground. On the size of the shields board boards. On the smooth surface, the bars are laid out after 70-100 cm and are aligned on top. Then the sliced \u200b\u200bboards are taken, carefully customized and nailed so that there are no large slots. It is allowed to the gap in 3 mm, wider cracks will have to be legitimate or to close the racks.

Mounting formwork is performed on a solid and even basis. Previously with the help of twine and pegs placed Foundation In accordance with the project. On the markup, shields are installed, driven by sharp parts of stakes in the ground. The level or plumb is checked their strict vertical position. Between themselves, the board panels are connected by wooden trimming, and on top are fastened with jumpers with an interval of 50-70 cm. From the outer side of the formwork, the saws running from the top board to the stakes driven by about a meter from the foundation are mounted.

The high formwork is additionally fixed by the threaded studs located every 50 cm. Climb the tightness of the typical wooden panels can be, if we brought from the inside with a polyethylene film or rubberoid. In the process of formworking, if necessary, steel sleeves under technological holes are installed. When using plastic enclosures, they are filled with sand to prevent their deformation. Next constructs armature carcassThe boarding structure is checked horizontally and vertically - everything is ready, proceed to filling the shape of the concrete mixture.

The formwork is removed in reverse order after drying the concrete - after 3-4 days, during this period the design is not worried. With a neat disassembly up to 60 ° wood, it is possible to save the integer for reuse. Another option may be combined shields: the frame is performed from the bars, and the plane is from plywood sheets. According to this principle, a reusable formwork is manufactured, which can be done or rented. Professional systems are produced from metal and plastic parts, designed for repeated use and allow you to perform work on the foundation device quickly and accurately. Make a formwork and at the same time insulate the foundation allow technologies using sheets of polystyrene foams as enclosing structures (Penopelex, PrimaPlex, Kinplast).

The formwork for the foundation based on wooden shields is distinguished by the availability of independent manufacture - requires ownership of minimal carpenter skills and the ability to produce uncomplicated measuring operations.