Screw Pile Foundations

screw pile foundation

If you are faced with the task of building a foundation, then a screw pile foundation is the cheapest and easiest option. Screw piles allow the foundation of a building to be installed quickly in all weather conditions using special equipment.



Most often, a pile foundation is constructed during the construction of small low-rise buildings, including cabins, bathhouses, fences, country houses, private houses, gazebos, and other buildings.

The speed of installation depends on the installation crew and on the type of soil at your construction site. The mechanized method involves the installation of 20 piles an hour. And after that, you have a ready-to-use foundation for your future home!

Installing a Screw Pile Foundation

Step 1

screw pile foundationBefore you start installing the piles, you need to do some preparatory work — construction site soil analysis and preparation of the site.

It is necessary to obtain information on the composition of the soil, its freezing depth in winter, the level of groundwater, and so on.

It is clear that only specialists can properly analyze the soil. They will also tell you how deeply the piles need to be driven in. Do not try to do any soil analysis based on your neighbors’ speculations.

Step 2

When choosing piles for a foundation, have a look at the accompanying design documents. They can give your information on the carrying capacity of piles and the correct conditions for their use.

This information will make it easier to draw up the layout of the piles. The distance between the piles cannot exceed 3 meters.

Step 3

Based on the layout of the piles, stake the construction site out. Stakes or other markers are placed at the locations of supports.

Step 4

To install screw piles manually, you need at least three or — even better — five people. The work is as follows. A pile is installed at the place of installation of the support determined on the basis of the layout diagram.

A thick reinforcement bar is inserted into the hole located at the top of the pile. The bar is then extended by metal pipes. Two (or four) people start driving the pile in, and the third (fifth) one monitors the angle of inclination of the pile while it moves.

With the mechanized method, two people are enough. One checks the level of the pile, and the other one drives the pile in. It speeds the process up and makes it more reliable.

It is important to monitor the level. The correctness of the installation largely depends on the angle of inclination. A deviation of even 3 to 4 degrees can negatively affect the quality of the foundation. As a rule, it takes just one or two days to drive all the piles in.

Step 5

After that, all the piles are marked using a level. According to this marking, the piles are cut to achieve the same height from the ground. The voids of the piles are filled with a concrete mortar which will prevent corrosion and make the piles more resistant. After that, a pile cap is put on top of the piles.

Step 6

Mounting the pile cap comes last. It is designed to bond piles together. When a pile is driven in, the soil is compacted, and the pile is fixed quite firmly in it.    

However, all the piles are installed individually, but you need to build a monolithic foundation. To this end, all the piles are connected to one another.

This can be done using various materials:

  • I-beam
  • wooden beam
  • shaped tube
  • channel

After the pile cap is installed, the foundation of the future building is ready.

Source: http://www.diy.ru/post/8861/

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