- - yard drill
- - concrete
- - bitumen
As a rule, the rack is made of steel tubes of circular, rectangular or square cross-section with a diameter of5 cm. Taking as pillars reinforced concrete pillar, give priority to those who are not reinforcing rod, two, and four.If you absolutely want to see support wooden poles, make sure that the part that is submerged in the ground, was no less than a meter is protected from rotting.To do this, pack it in a metal pipe, cover the daubing of the heated bitumen or anneal in the fire until a layer of coal.
To give the design the mechanical stability and the ability to resist wind loading (at the height of the fence to be two meters), enough to bury stands 0.7-0.9 m. Where lie close to the ground water or soilheaving (loam, clay, silty sands), it is recommended to increase the depth of a rack of up to 1.5 m. It is a measure equal to the thickness of soil freezing.If the poles will be installed at a shallower depth, resulting in swelling soil they will be squeezed out of the land, construction and distortions.
Standard step size between supports from 2 to 3 meters.This figure is primarily dependent on the weight and material of the fence spans prozhiliny.When erecting fences heavy (stone or brick), the weight of one meter of more than 100-150 kg, it is necessary to arrange a strip foundation.
For drilling holes for pillars use a drill yard.The diameter of the blades should be 30-40 cm, which is 2-2.5 times wider than the diameter of the rack.The bottom of the pits fill with sand and gravel layer.Install poles vertically, "beating" them for plumb and level.Grout or zabut entire volume of the pits after installation of pillars.
When working with towers on the slopes, remember that first established the extreme corner of the rack.Then he pulls a cord between them.Use the measuring stick and a plumb position of the planned intermediate pillars.It is recommended that the magnitude of lowering near crossings does not exceed a quarter of their height.