The strip foundation
During the construction of the main part of the structures, the strip foundation is chosen. Ribbon reinforced concrete structure has a special structure. Such a trench is deepened below the freezing layer. The foundation is considered an underground structure, all work is carried out in a dug deepening. It should be borne in mind that without formwork, soil of loose material. So that during work not to fall under the ground, it is necessary to dig a trench with slopes for a natural showing.
If this is a small structure with a shallow trench, these are not large labor costs. Under the apartment building under construction, a foundation pit rummages to the level of the lower sole of the foundation. Already on the prepared site, the circuit is marking and setting the formwork for the construction. The lower layer always serves sand, which is covered with parchment. This is a waterproofing layer. When pouring the foundation, it is necessary to hold cement milk in the mass, the insulation layer performs this function.
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Next, reinforcement is installed. It is precisely the longitudinal rods of it serve as a metal ribbon that transfers the load of building structures to the ground. Therefore, the tape is made of corrugated iron rod. It represents a design connected in a voluminous figure through thinner rods and wire. Made according to certain rules, the tape carries the main load.
After that, the formwork is strengthened with additional stretch marks and supports and concrete of brand 200 or 300 is poured into the resulting gut. Concrete hardening time and acquisition of strength 28 days. However, after two weeks, you can start installing. By this time, concrete had already gained up to 80% of its strength. While the frame is being built, the design strength of the foundation will be achieved.
The further construction of the frame depends on the verified size of the strip foundation. Therefore, the markup under the foundation is given special attention. Straight angles should be withstanded without the slightest deviation. At the following stages of construction, errors when laying the foundation will only increase difficulties. Hidden defects that have not been manifested at the construction stage will bring problems during the operation of the structure. These are cracks in wall panels, subsidence of the building and other troubles.
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