Today, the most popular types of foundations for residential and other buildings include the foundation on bored piles., which is excellent for difficult soils, eg, foundation on turf, clay etc.
With insufficient bearing capacity of the soil, with the help of research determine the layer of soil, which is able to withstand the load from the building. After that, they proceed to the creation of a pile foundation..
The main task of piles – transfer the load to stable ground. Besides, foundation on bored piles relevant for heaving soils with a large freezing depth. Generally, such a foundation is quite technological. Previously, it was used mainly in large industrial construction., today it is increasingly used in private housing construction.
The main difficulty in creating such a foundation lies precisely in determining the depth of the soil with the necessary bearing characteristics.. Only specialists can solve this problem.
After its solution, you can start drilling a well. Drilling can be done in two ways – manual (use of a special drill) or with the involvement of special equipment. The number of piles is calculated at the design stage from the condition of the total weight of the building and its design features. For drilling wells with a diameter of not more than 300 mm can be used manually, for larger diameters it is recommended to use motorized drilling rigs.
Drilling technology is widely used today, at which at the bottom of the well it is possible to obtain a hole with a diameter of large, than the diameter of the trunk itself. A similar broadening at the bottom increases the area of u200bu200bsupport, which reduces the likelihood of piles sinking.
The next stage is the arrangement of formwork for piles. The simplest option is to perform formwork from roofing material.. A sheet of roofing material is rolled up into a tube, which is wrapped with wire for strength. Often the top of the soil is the least stable, therefore, an additional layer of roofing material is provided at the top of the formwork. If pour the foundation without formwork, the liquid part of the concrete is absorbed by the soil, which will lead to a decrease in the strength properties of piles.
After the formwork, a reinforcing lattice is created. Vertical reinforcement must necessarily go beyond the ground level, to be able to connect all the elements of the foundation.
Particular attention should be paid to the visual control of the well for the presence of water in it.. If the groundwater level is more than a quarter of the height of the well, water needs to be pumped out.
At the last stage, concrete is poured into the well. Concrete must be poured in batches, also desirable, so that the process occurs with vibration shrinkage. After the concrete has hardened, you can proceed to the formation of the ground part of the base.
We recommend to the overview: The main mistakes in the construction of the foundation on bored piles. Video.
