What are screw piles?

the idea to use piles for the Foundation appeared for a long time. However, about two hundred years ago, the Irish civil engineer Alexander Mitchell suggested an improved design and a patented "helical pile". 1833 it became the starting point is the use of screw foundations. And design, on the basis of which they are collected, is called "screw piles Mitchell”. For nearly two centuries, the design has undergone a number of changes and enhancements, but fundamentally the idea remains the same.

the First building, the construction of which used a patented innovation, is a lighthouse on the South-West of Ireland harbour cork harbour. By the way, interesting fact, this lighthouse still stands unharmed. And experts say that this was largely due to the use of a Foundation of screw piles.

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Constructively screw piles consist of three main parts:

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  • the trunk.
  • tip with a spiral blade;
  • tip

When you select the Mitchell's piles, special attention should be paid to the material from which they are made. After all, even in the driest areas, the body of the pile is from time to time be exposed to groundwater. Accordingly, when low quality materials, the house on stilts stand for long.

in order to extend the life of screw Foundation manufacturers use a variety of protective coatings. One of the most effective experts believe a two-layer polymer coating using epoxy resins. By the way, in "Art Metal Ukraine": you can buy galvanized screw piles for a new generation.

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Main advantages of screw piles

Almost 2 centuries of the history of the use of screw foundations is due to the long list of benefits of this construction technology. To name just the main ones:

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  • High-speed installation. For small buildings it will be enough 1-2 days;
  • No need for major earthworks. For such a Foundation do not need to excavate or trench. Also do not need large-scale preparation of the construction site, its alignment;
  • all-weather and all-season nature of work;
  • the Possibility of continuing construction works immediately after the installation of the Foundation;
  • Stability Foundation in freezing temperatures.
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Disadvantages:

Any building material or technology with the many advantages it has its disadvantages. And screw the bases is not an exception:

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  • the Difficulty of the arrangement of the basement in the house;
  • the Need for additional insulation of the lower ceiling;
  • the Difficulty of installation in rocky soil. However, this drawback can be neglected in the presence of construction machinery.
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the use of screw piles

Typically, helical foundations are used in cases when the use of other options will be ineffective. We are talking about difficult terrain - moving, Lebaneses that swell. In this case, the use of, for example, a strip Foundation may cause seasonal movement of the building. And this, in turn, would entail at least a change in geometry of the building. The result in spring, after thawing of the soil, Windows and doors will jam or even closed longer.
Piles also Mitchell, due to the presence in their design of the screw is securely fixed in one position. That is, the blades perform a kind of anchor function.

Choosing screw the Foundation, you need to keep in mind that its bearing capacity depends on the massiveness of the helical structures. Therefore, the heavier the house, the greater the diameter and length you need to choose a pile.
Most professionals recommend the use of ground screws for frame house, buildings of timber or small buildings of brick or foam (gas) blocks. All of these materials do not give the critical loads on the Foundation.

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Technology installation of screw Foundation

the Process of installing helical Foundation begins with its layout. To the layman it is quite difficult to do. Because at this stage it is important to consider and evenly distribute all loads that will go to the Foundation.

then starts the installation process. In its regular place screw pile is installed by screwing into the soil to desired depth.

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is it possible to perform the installation of the helical Foundation yourself?

Technically the majority of construction works can be performed independently. And screw foundations this statement applies in full measure. However, the involvement of professionals for such work is considered more appropriate for several reasons:

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  • When self-Assembly is difficult to sustain the absolute vertical piles;
  • Hand-twisting piles will significantly increase the turnaround time. Professionals for these purposes, use special equipment (for example, the use of the manipulator accelerates the process several times);
  • During manual tightening is problematic is the passage of hard layers of soil with stones, zalesovskaya clay. It is therefore reasonable to entrust the procedure to the professionals.
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USEFUL information:

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  • Screw foundations are not recommended for use on soils with high acidity (Ph< 5.5 in). Such a measure will significantly reduce the service life of piles;
  • the shaft of the piles made of steel pipes, which are welded to the handpiece and the tip. The latter is necessary in order to Foundation piles to strengthen the transition Board or first row of the wooden house. To word this design not only performs the function of the transition from Foundation to walls and ceilings, but also to bind the piles together for greater rigidity of the Foundation;
  • Tip of the screw is recommended to choose cast type. This will avoid its deformation and destruction in the process of installation;
  • Upon completion of the installation of screw piles hollow tubes filled with concrete. This allows to increase the strength of the Foundation even in the event of freezing of the soil.
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Source: http://uzinform.com.ua/

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