The bored foundation is one of the foundation options that is perfect for difficult terrain with sharp changes in height and difficult soil, in the presence of dense buildings in the settlement, in places with a danger of damage to neighboring buildings and communications.
The erection of such a type of foundation, as a bored foundation, is the drilling of pillar holes in the soil, into which a metal frame is immersed, and then all this is poured with a concrete mixture or a solution of cement with sand.
The bored foundation is mounted directly on the building site. When starting to calculate the foundation, it is necessary to take into account the nature of the soil (the level of its freezing) and the weight of the future structure. As a rule, the width of the future foundation should be 30-40 cm more than the estimated width of the external and bearing walls of the house.
Don't worry, for a frame house you don't need a powerful zero level. In frame houses, the walls are light, but if you are building a massive house, then the piles will have to be made 30-40 mm thicker so that the load on the foundation is proportionate. The calculation table will help you.
You can choose the location of the piles in different ways, usually it is done under the main load-bearing walls of the house, but you can also arrange the bored piles in a checkerboard pattern.
Mark out the building site, dig a trench, determine the location of the pillars and align the foundation line with a fishing line and a level.
Manufacturing of wooden formwork
Formwork is necessary where there is a possibility of soil crumbling; for piles, formwork wrapped in a tube can play a role. We produce timber formwork for strip foundations.
For piles to serve for a long time, choose better quality piles, bored piles can be placed at a distance of a couple of meters from each other, depending on your home. If your piles are 50 cm in diameter, each pile can withstand up to 5 tons, which gives you the opportunity to build even from bricks, the reliability is high.
At the bottom of the well, a cushion of sand or crushed stone is arranged, which is manually compacted. After that, the prepared construction quick-hardening cement mixture (concrete) is poured into the pit, sometimes it is combined with stones. A prerequisite is the supply of concrete composition at a certain level of vibration and in small portions. This will eliminate the formation of air voids and provide the foundation with strength and durability.
It is better to use reinforcement with a diameter of 10-12 mm. They will provide sufficient structural strength.
At the next stage, we knit a reinforcing cage, the lower edge of which must remain immersed in the concrete mix and not touch the bottom of the pit. Otherwise, the metal will corrode, and the bored foundation will lose its strength.
To ensure the strength of the future bored foundation, the well is waterproofed with a layer or two roofing material. On soils with high humidity, casing pipes are used for protection.
The reinforcement is installed in the formwork in the form of a grid, however, without touching it.
For this, the reinforcement cage is connected to the pile cage. Then the formwork is poured with a solution, after its hardening, the bored foundation is considered ready.
At the final stage, the grillage is installed, which unites the parts of the bored foundation protruding above the ground. The most durable is the monolithic grillage made of reinforced concrete. To install it, you will need reinforced concrete mortar, reinforcement and wooden structures for formwork.
After that, you need to let the foundation dry for up to one month.
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