To understand the peculiarities of the foundation with columnar grillage

If the concept of "foundation" is familiar to many, here on the raft foundation is necessary to elaborate.Grillages called the upper part of the foundation on pillars, which allows you to combine individual poles together.

weak soils - direct indication to the building using a raft foundation.This type allows foundations to distribute the load from the building to the strata of soil, which is denser and lie deeper.On slabopuchinistyh and sandy soil, without a foundation with grillage not do.Preliminary examination of the site is carried out, which gives an opinion on what type of foundation - columnar and ribbon - should apply.Preparation and construction of these types of building foundations differ slightly.But, if you decide to use the base of the "pier foundation" grillage will too.See also the article about the pier foundation by hand.

Features columnar base

This type of foundation is characterized by the orderly installation of special supports - columns, which have, where the main load-bearing wall of the building of the future intersect.To ensure interoperability pillars fasten their edge beam.The resulting horizontal base and forms a grillage.

to the type of bar and include the foundation-monolith.In this case, the piles filled with concrete with pre-placed reinforcement bars inside.Location carrying beams relative to each other - 150-250 cm, one-piece construction.If the columns are separated by a distance of 3 meters, the raft may perform edge beam (usually reinforced concrete monolith).

Applications of the foundation of the "columnar»

Most often, this type of a raft foundation is used:

1. on the construction of brick walls, if you want to lay a deeper foundation (from 150-200cm).Stair foundation will be much more expensive;
2. when possible frost heave;
3. in construction, where it is not provided for arrangement of the basement \ basement, building materials used are not heavy;
4. in situations where provided is not too deep drawdown columns;

benefits of using raft foundation with columnar

• is easy to calculate the cost of such a foundation: it is usually about 15-18 percent of the total amount pledged for the construction.Other types of happen to "fall short" and a third of the cost of construction;
• pier foundation to build a raft easily than other types of bases;
• Soil is much more effective work under the post or column, than, for example, a tape base, ie, the column is less than squander.Increased pressure on the foundation, while reducing the characteristics of the area of ​​its towers, leading to cheaper construction.If the soil freezes deeply, better to use reinforced concrete, prefabricated and even monolithic structure.These types of support are subject to almost no change in the situation due to frost (the so-called heave).

Where do not apply the foundation on pillars

• When there is a horizontal oscillation of soil, will have to perform grillage so massive that it would adversely affect the construction budget.
• and soil with a mild properties with respect to ability to serve as a basis for the foundation - also not an option for the use of columnar foundation (wet clay rocks, sandy soil and peat soils).
• At the construction site, where there is a height difference.Under differential meant the difference between the level of the foundation 2 meters and more.

Construction columnar foundation

Rostwerk Stolbovoye on the basis set after gidropodushki devices and water-protection, made with the help of x \ concrete slabs or monolith.This "cushion" complements the support elements, helping to prevent compaction of the earth.

Clay soils require the creation of a sand cushion.