Screw piling: what is it and how to carry out the procedure?

A country house usually weighs quite a lot, therefore, its support must be very strong, despite the fact that the foundation was created from individual piles. Screw piling is required to evenly distribute the entire building mass. Thanks to this reliable coupling, you can connect the individual piles into a single unit - the foundation.

Features and Purpose

Separately located elements placed along the line are not in any way in contact with each other, and form the basis of the pile foundation. To connect the piles into one whole structure, which is necessary for laying the foundation foundation, which is the pillar of the building, it is necessary to equip each pile with a special cap, and then create a binding on it.Moreover, this trim aligns the entire top line, along which the piles are installed, into a single flat horizontal plane. This is very important for the sustainability of the future home. It is worth noting immediately that the pile-screw foundation is the best way to create a foundation for buildings.

This foundation is environmentally friendly, costs much less, it is light and is installed very quickly compared to other types of foundations. A dwelling house of timber can be built with considerable profit. The house itself is being built mostly independently, the principle of the designer is applied. During the laying of the foundation screw the piles are screwed into the ground, work is carried out by analogy with the tightening of screws. Some difficulties can be encountered when performing the binding of screw piles. Because during the installation process you need to create a grillage. It is worth remembering that much will depend on the quality of this work.

Load calculation

When installing the pile foundation on screw supports, you have to work with a foundation for a weak load. This scheme is well suited for small barns, garages and baths, made from timber.A weak support will be more than compensated for by the considerable construction speed and very low costs. The foundation on the screw piles is constructed from supports, installed vertically, and strapping, horizontally located. Four supports are commonly used throughout the system, although there may be more.

Binding in this case is a grillage. It is created from a material suitable for creating a beam. It can be either concrete, wood or metal. The wood is laid at the base of the timber, a corner is made of metal, blocks are made of concrete. The binding of screw piles connects beams among themselves and with a grillage. The positivity of the process directly depends on careful compliance with all the requirements of the instructions for installation and installation.

The heads of the piles must be on the same line of the horizon, which is controlled when the supports are submerged in the ground. The width of the timber should be one and a half times the diameter of the piles. Another mandatory requirement is that the axis in the center of the supports must necessarily go only through the center of the beam. The binding of screw piles connects supports and beams with a threaded joint either for welding or for clamps.

What and how to tie?

Binding material

Installation depends on the characteristics of the material of the beam and the foundation. The binding of screw piles by means of a bar occurs very often. But many are interested in the question of whether to use the technology with the use of timber, if you can use stronger materials, such as concrete or metal. It should be noted that the timber is the best option for the grillage when building wooden houses or using frame technology, because the timber has great strength and very high resistance to temperature extremes. When processing antiseptic, protecting the tree from rot, the life of the bar is longer than the beams of steel. Tying a bar of screw piles is carried out according to the technology, which provides for fixing the beams to the thread, or fixing all parts of the grillage with clamps.

Thread mounting

This technique is used only for the foundation, made on the P-image. In the grooves on the flanges set the bar and fixed with a support using self-tapping screws. Between beams and piles place ruberoid. Connect the beams at the corners in a paw or cup. The fastener angle can be spikes.For the corners outside use the elements in the form of a corner. This method allows not to waste time on grooving system.

The best binding of screw piles is the laying of the fastener element at the outer corner. Fastening is carried out by screws to the parallel bars.

Using hose clamps

Such fixation is used in systems using piles with no flange. In this case, the top of the pile head is welded on a rectangular pad, a beam of the grillage is put on it. U-shaped clamp fits over the beam, its width should be equal to the width of the beam. The edges of the clamp, which will hang down, are welded or threaded with a vertical support. In the corners of the beam, the connection is made using a metal angle.

Use of channel and I-beam

On slightly loaded structures, you can build a grillage from a channel bar. Such constructions include, for example, baths and sheds. The pile cap of metal and piles is tied with welding. The elements of the base and structures are fixed on a circular seam. The assembly procedure is to install the channel on the pile heads. The element can be strengthened so that the side faces will “look” down.The binding of screw piles by a channel is also carried out in the opposite direction, in which case the faces are directed upwards.

When the channel is located in such a system, the resistance to loads on the transverse parts of the structure is much better. It turns out the formwork, which must be poured with mortar, thus forming a wall for the reinforcing belt. To provide high strength strapping, an I-beam of equal dimensions is used instead of a channel bar. When channels and beams are joined at the corners, then welding is applied. At the end of the binding of the supports, the grillage is covered with an anti-corrosion agent.

Trimming

Strapping screw piles with boards often involves the use of material from cedar, larch, pine or spruce. The foundation fasteners in this case begin with the production of the beam, which is based on the boards. The elements are glued together and fixed with screws or a bolted system. Applying thin boards in the construction of the foundation, it is additionally necessary to press them down with plywood sheets. Be sure to ensure that all joints of the boards are located on different piles.

Between the boards connect in half.Beams are placed on the edge and fixed with piles.

The binding of screw piles according to this technology is as follows:

  • internal, middle and external contours are created (the principle of the Christmas tree);
  • elements are collected and fixed in turn;
  • between the channel, the pile caps and the strapping itself, a layer of roofing material is required for waterproofing;
  • if the height of the strapping is more than 40 cm, then the base is additionally reinforced with a proftrub.

Using a pipe from a profile for strapping with an I-beam

If there is a desire to make the strapping with an I-beam, then you need to prefer material with perforation holes. The double tee needs to be welded as tightly and firmly as possible. The preference in choosing this particular material lies in its high strength and low mass. With such a structure, the profthrub acts as a strut, which increases the durability of the building foundation service. For strapping, the pipework is welded outside around the entire perimeter of the foundation.

Do I need strapping during construction?

Very often, the future owners of private houses think about whether the binding of screw piles is needed or not. The foundation on piles is a structure made of poles recessed into the ground.Installation of these supports is carried out very carefully, but even so they will not be able to meet the maximum requirements of strength, will not be fully reliable. Floors may well skew in the subsequent operation of the house, and the binding will definitely not allow losing the strength of the base of the building, which will make it very strong, and, therefore, the house will last for many years.

Important: it is necessary to use very strong building materials. The beam will fully allow you to get a fairly solid foundation that can withstand impressive loads.

Recommendations of the masters

When choosing a strapping from wooden lumber should follow the following procedure works:

  • Upon completion of the installation of screw piles and leveling, metal platforms made of sheet steel 20x20 cm and not less than 4 mm thick should be welded onto their heads;
  • in these fragments of metal sheets it is necessary to drill four holes with a diameter of 8 mm for fastening the timber;
  • at the end of the work, welding seams and tips should be treated with an anti-corrosion compound;
  • from above it is necessary to lay waterproofing, usually of roofing material in two or three layers,that will prevent the accumulation of moisture in the joints of metal and wood;
  • one row of timber or a pack of boards is placed on previously prepared platforms;

The geometry of the future building can be checked by measuring the diagonal of the frame from the outside with a tape measure or a simple rope.

  • it is important to lay the joints of the timber from the butt in a “dovetail” or “paw into a paw”;
  • when all parameters are checked, the bars can be fastened to the supports with screws, which should have a diameter of 8 mm and a length of 150 mm, they should be screwed with a wrench;
  • you must first make a drill in a timber a hole with a diameter of 6 mm for three quarters of the screw length This is necessary so that the timber does not crack;
  • an even more reliable structure is fixed with bolts with a diameter of 8 mm, which must pass through the bar from top to bottom. To do this, you must first make a hole using a drill with a depth of 10 mm. It is necessary for mounting the bolt head and washer, the diameter must be at least 30 mm.

When all the elements of the strapping are fixed, it is necessary to once again verify the correctness of the geometry on all sides and diagonally, after which we can assume that this stage of work is completed and you can begin to build a house.

Binding is also called grillage. Today the grillage is one of the best options, characterized by very high quality and maximum reliability while strengthening the pile foundation. With your own hands you can create a reliable support for your home. Before starting work you need to prepare the level and roofing material, as well as screws. Do not forget about the hammer and metal corners. The choice of other materials and tools depends on a particular technology. Best of all, according to experts, the technology using clamps and threaded connections.

It should be noted that the correct binding of the timber must be necessarily treated with antiseptic agents that protect the wood from bacteria and moisture.

About the binding of screw piles, types of binding, purpose, necessity, see the following video.

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Information provided for reference purposes. For construction issues, always consult a specialist.

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