Rostverk on piles is the best solutionfor structures erected on weak or unstable soils. The main goal of such a construction is to combine the bearing elements into a monolithic structure, which gives the building an additional margin of safety and reliability. This technology provides for the presence of reinforced bored piles, the diameter of which varies between 25–40 cm, driven into the ground to a depth of 1.6–3 m.
Foundation of the technologygives the building greater reliability and stability. This is due to the fact that the grillage on stilts holds and fastens the vertical supporting structures between them. Thus, it gives additional strength to the structure and counteracts the forces of frost heaving of the soil. The pile field for the grillage on piles consists of vertical bearing structures installed at intervals of one to one and a half meters depending on the type of soil and the depth of the frozen layers.
For laying this structure arounda shallow trench of approximately 30–40 cm is excavated to the perimeter of future walls. Then, with the help of a special drill, wells are created in it for laying piles. An asbestos-cement pipe with a pre-connected reinforcement cage is lowered inside the holes. Also, the trench is laid out geotextile and covered with sand. On the resulting pillow mount the formwork. Then the whole structure is poured with concrete, which is a very important operation.
It is necessary to use here.special vibrator to seal the mixture and remove air bubbles that contribute to the formation of cavities of various fractions. This may further lead to cracking of the structure and the collapse of the entire building. Monolithic grillage on stilts must be reinforced to make it resistant to bending loads. Otherwise, at the slightest strain, there will be a threat of cracking of the concrete.
The grillage is reinforced with two stiffeners -upper and lower, consisting of several longitudinal steel rods, the number of which depends on the mass, height of the structure and the type of soil on which it is built. This design is also reinforced with transverse reinforcement, which does not take on the load, but is necessary for binding the entire frame into a single monolith.
In modern large-scale constructionsuch materials are used for the grillage as steel and precast reinforced concrete structures of the brand M350 on a granite basis. In the construction of wooden structures from the beam with a grillage, the lower protrusion of the bars, located directly on the piles, often serves. Also in this quality can be used I-beams. True, this option is more expensive.
According to current technology standards grillagecan be used in the construction of capital brick buildings, as well as in buildings of aerated concrete blocks or wood concrete, erected on clay and combined soil, on soils of medium density and high water saturation.
