Columnar (pile) foundation

By Admin | Building
25 May 2016
subject is not large.Meaning build pier foundation completely similar to all other types of foundations.

Here he writes about this Encyclopedia.

pile foundation, a foundation in which to transfer the load from the buildings to the ground using piles.It consists of piles and pile cap unites them.Choose between S. p.and conventional natural-based foundation is made on the basis of their technical and economic comparison of the data of engineering-geological conditions of the construction site, taking into account the characteristics of the projected building or structure.C. f.especially in the rational construction of buildings and structures on the water-saturated soft soils.

In many cases, C. f.significantly reduced the amount of earthworks and the flow of concrete.Depending on the type and size of loads acting on C. f., Have piles: one - for individual support, rows - a wall structure bushes - under columns, pile fields - for buildings and structures of small areas with significant vertical loa
ds.The action on the foundation of significant horizontal forces inclined piles used.

long piles selected based on the soil conditions of the construction site: the need to lower ends of the piles were buried in the little compressible soils.Depending on the properties of soils occurring under the lower ends of the piles, the latter divided into pile-stand, based on virtually incompressible soils, and hanging piles, submerged in compressible soils and transfers the load to the ground as the bottom and the side surface.

basis for the design of reliable and economical C. f.It is the correct definition of the carrying capacity of the pile, ie. e. allowable load for her.Bearing capacity of piles set on the basis of geological engineering survey, according to the static ground and the results of tests of piles by static and dynamic loads.The most reliable test of piles by static load, but due to the high labor intensity of this method (especially in the case of bored piles), its use is limited mainly to buildings and structures with heavy loads under unfavorable geological conditions.

Lit .: Grutman MS, Pile foundations, K., 1969;Trofimenkov G., Obodovskii AA, Pile foundations for residential and industrial buildings, 2 ed., M., 1970.

It seems to me that the above article is quite understandable.I speculate about the same on the everyday level.

I think you can make a big mistake, deciding on the pier foundation can be great savings, bars dug to the same depth as that of, say, strip foundation.Indeed, soil is usually compacted (compressed) by its own weight.The deeper we go, the denser the soil should become.At one point, we can not dig simple tools - a shovel in the ground is not included.We assume that we have reached the desired degree of incompressibility.You can put pillar, dig it, then pour cement or concrete and build a house on it.And what will happen if we do not dig up the soil with the required rigidity?Prepared as if we had put the goods on four needles stuck into a cotton pad.You see my point?Home of needles can easily go into the ground.And if the soil is saturated with water?How, then dig a considerable depth?The pump is put?

It is this professional building piles was slaughtered.Have you ever seen how the pile hammer?It is a machine that puts the pile and hammer on it a hefty load of which is pre-ups on the ropes.Pile first is easy, then harder, and then ceases to sink.This means that the stiffness of the soil beneath the load is balanced, which hammer it.Because we know the value of the goods we may calculate how much weight to such a building pile will fall.From these calculations, and displays the number of piles on the wall or the entire building.In this case, we really do not care what type of soil under the pile, as far as it is soaked with water and the like.Ceased to clog the pile?Well and good.So all right.You can shorten it to the desired height above the ground and build a house on it.

Can you repeat the procedure for the calculation and construction of the foundation for a private house?I'm afraid that it will be hard, and therefore rainfall, and the risk remains.

What is the conclusion?Do not make the pier foundation?I think that it is not necessary.However, with the reservation.If you have a house in the swamp, or water-saturated ground, it makes sense to order a machine that makes the hole in the ground and to dig large diameter piles, often metal or asbestos cement pipes to a considerable depth.I can not say exactly on what - it all depends on the weight of the building, pipes, or piles, and the condition of the soil.The primer can be identified by its drilling.

In any case, you get the following disadvantages.

high cost of construction: machine, a crane specialist foreman, work, pipe, concrete to fill them.

house, built on stilts, will be high off the ground and under it will blow out the wind.

Finally, the device of the cap can be a problem.On the bricks have to forget.Most likely, it is necessary to sew some material such as a flat slate, and it is fragile, and easily cracked.

short, to build a house on stilts need a very moist soil, but in my experience to build a house on a bad (wet) soil is not recommended.