Bored foundation - a kind of piling foundation. Piles as a basis for building a building are used where the device of a conventional buried foundation is problematic: on peat bogs, in areas with very high groundwater levels, or on weak mobile soils with very deep bedding of strong layers of soil. The name of the bored foundation was obtained thanks to the technology of execution: the piles are made using the method of pouring holes drilled in the ground with concrete.
Bored foundation with their own hands
Advantages and scope of application
The advantages of bored foundations include:
- The possibility of construction in areas with weak and strongly puchinistymi soils;
- Low cost of work;
- Short deadlines for the foundation;
- Low labor intensity and the ability to perform a bored foundation with their own hands without the use of special equipment.
The shortcomings include the inability to arrange a basement and insufficient thermal insulation of the lower part of the building.
Scope of bored foundation - a private low-rise lightweight construction: frame and wooden houses, bathhouses, gazebos and garages, country houses of light materials. The bored basement with an overlapping beam( grillage) can withstand more severe loads. It is also advisable to choose this type of foundation for construction on sites with a large difference in altitude.
Construction of
The construction of the bored foundation is extremely simple: in the soil with the help of drill make wells with a depth of at least 1.5 meters. The diameter of the wells is determined by calculation and is in the range of 15-40 cm. The walls of the wells are reinforced with formwork if necessary, a reinforcement is installed to prevent vertical deformation, and poured with concrete. On top of the piles, depending on the type of structure, lay grills or immediately erect walls.
foundation structure construction
execution technology Perform a project that calculates the number, depth and diameter of the piles. Make the markup of the plot: determine the axes of the future building, choose the first corner and slam into it a metal rod. The twine is tied to a rod, and two adjacent walls are laid perpendicularly with a protractor. After measuring the outer distance, mark the second and third angles, and using a twine and a protractor determine and mark the fourth angle. On the trajectory of the walls, at the calculated distance, the drilling sites are marked.
Draft of the future foundation
With the help of special equipment or hand drill make wells, the depth and diameter of them are determined by calculation. At the same time, for the implementation of a more solid foundation, a drill having a plow at the end and allowing the base of the wells to expand to form a support is used. When drilling manually, use the level tied to the drill - check the position of the drill after each revolution and, if necessary, align.
The process of manual drilling of a well for the foundation
Cement Pipe Formwork Process Pile reinforcement is performed using vertical bars of the design section. The rods must be joined at a distance from each other by means of transverse rods, connecting them with a wire. If you plan to lay the grillage, the reinforcement is taken out to the height of the grillage for better binding of the structures.
Foundation reinforcement process
Prepared well with formwork and reinforcement is poured with concrete of not less than 200 grade, concrete of what brand is needed for the foundation, search on the site. To remove voids, the armature is raised several times inside the well. If technology is used with the extension of the pile foundation, the formwork should be raised by 20-30 cm after pouring the first batch of concrete, which will allow the concrete to fill the pile foundation.
Concrete poured drilled foundation
Further construction with such a foundation technology can begin in a few days. Piles must be waterproofed with roofing material or bituminous mastics to avoid the destruction of the foundation.
Also in addition to the above, read about the foundation warming yourself.
