The foundation on screw piles, as it generally

In recent years, most developers prefer screw-pile foundation with which building lumber and timber frame houses. However, if you are sufficiently aware of the construction technology, which appeared over a century ago?

It is very important to show maximum responsibility in the construction of the building. It should take into account all the details relating to construction stages. And, above all, should understand what the foundation is used. However, what if the on-site construction of the house were found "difficult" soils.

These may be considered:

• peatlands;
• Wetlands;
• Areas with groundwater;
• Areas that are affected by the forces of frost heave;
• Sites that are often subject to flooding.

In this situation, it makes sense to build a pile-foundation screw that requires a minimum of time for construction and are reasonably reliable.

Helical pile foundation has several advantages:

• Installation takes less than two days;
• Lesson eliminating irregularities relief portion is not required;
• We do not have to spend a large amount of earth works;
• The piles may be installed in any weather.

If we talk about the disadvantages, which has a screw-pile foundation, we can highlight the following:

• Piles can not be set on a rocky terrain and areas where there are limestone layer or rocky ground;
• Installation of piles can not be arranged at a distance less than 0.5 meters from the already erected house. In this situation, there are difficulties associated with the use of special instruments;
• The decision to erect pile-screw foundation can create difficulties that will appear in the case of building a house with a basement. In this case, the foundation may require high cost.

Using the experience of the participants forum, Then we will discuss:

• Device features a screw-pile foundation;
• Information, which should be placed in order to determine the required number of piles;
• Nuances regarding the installation of a screw-pile foundation;
• Common mistakes that allowed for the installation of piles.

Design features a screw-pile foundation

Fundam on screw piles represents a number of piles which are screwed into the ground. Together, they form a unified field. During the construction of houses is usually the choice of stops on matchmakers, have the following dimensions. The barrel should have a diameter of 108 mm and a length of 2.5 meters, and the blade must be 300 mm in diameter. Upon completion of screwing the pile into the ground will act outwardly of the barrel fragment having a length of about 50 cm. Next, go to the weld to the barrel tip of the pile. Typically, the size of the following tip: 250x250 mm.

The need for headroom due to the fact that it will be installed strapping beams, channels or raft foundation, which will subsequently be placed house.

The pile consists of a metal tube, which has a pointed end and a specially shaped blade, placed at the bottom. The presence of the blade just allows you to screw pile into the ground. During this procedure, it is sealed. Completed the installation of piles in the moment when you reach the desired depth of any solid foundation. Therefore, even after the installation of pile load capacity for which it was designed.

The difference between the piles can consist in length, diameter and purpose. These parameters make it possible to classify them into types:

• Screw pile Ø76 mm - used for the construction of fences, gazebos and small outbuildings;
• Spiral pile Ø89 mm - can be used for the erection of huts and piers;
• Screw pile Ø108 mm - the ideal solution for the construction of frame houses and the bar-shaped type;
• Screw pile of Ø133 mm and up - allows you to build residential buildings based on the logs, concrete blocks and industrial buildings.

Getting piles choice, first of all, you need to take into account key parameters.

These are:

• the wall thickness of the metal stem. For qualitative piles this parameter has a value in the range of 4-4.5 mm;
• The thickness of the metal blade, the minimum value of which should be equal to 5 mm;
• The quality of the weld. It is important that after the welding was not shells and undercooked areas;
• The protective coating of the pile. In the presence of poor quality or thin paint layer during screwing the pile it will be removed when it is in contact with the ground.

Along with this, it must be said that there are piles that have molded tip. These piles are characterized in that the tip together with the blade form a single element. Last created in foundries, after which it is fixed to the trunk of the pile by welding.

Compared to a similar pile welded demonstrates improved reliability. The fact that its blades are characterized by considerable thickness, but at the very piles there is only one weld. At the same time it can be screwed into the ground in the place where there is vegetation roots or small-sized stones.

How to calculate the required number of piles?

The conventional wisdom is that when screwing the pile into the ground is important to follow some step. In this connection, for determining a desired number of piles have enough idea of ​​the main objects parametritis - length, width and weight. However, on the basis of practical experience, we can say with confidence that this judgment is wrong. How can you find out how many piles required in the construction of the foundation?

How to find the forum users to prevent errors in the determination of the pile field, you first need to find out the carrying capacity of the land under the blade of the pile. To do this on a site to choose the so-called "control points" and screw the back of the pile. With the results of screwing, you can install, what length should have piles and how many of them will need in the construction of certain homes.

To determine the key parameters of the pile foundation, you can turn to a special table. It will establish the carrying capacity of screw piles, focusing on soil type.

If we talk about the Russian capital and its suburbs, there piles must be screwed by at least 1.5 meters. This allows you to have confidence that the pile foundation will be set below the depth of soil freezing. Subject screw piles mount technology diameter 108 mm, it can cope with a load of five tons.

Features mounting screw-pile foundation

For installation of screw piles can be used along with mechanical and manual method. In the first case the equipment is operated, equipped Hydrodrills, while the second - to attract workers.

I must say that the use of mechanical methods for installing piles less difficulty arises regarding the efforts to ensure the required screwing. Along with this, with this method it is possible to achieve higher accuracy pile shaft to center. Due to the installation and to obtain more accurate. It is important that the barrel is screwed piles deviated from the vertical axis of no more than two degrees.

Upon completion of screwing piles to the required depth it is necessary to cut the tip. To comply with the horizontality of piles and ensure compliance with the same level should be verified by means of lasers.

Next you need to fill in the trunk of the pile concrete solution. Many people mistakenly believe that this operation will help to strengthen the pile. In fact, this leads to the fact that oxygen is removed from the pile, that allows to protect the inner metal part of the barrel against corrosion. In addition, the concreting of the pile to protect it against the penetration of water in the winter, which can lead to its rupture.

What other points need to be taken into account during the installation of piles?

• Understand that the pile has reached a reliable base, it is possible, if it is seen that the metal of the barrel lugs noticeably deformed.
• According to members of the board, fill the barrel with concrete should not be to the end. About 20 cm from the top of the pile must be free. This space is filled with dry sand-cement mixture. This operation will help to remove residual moisture from the trunk;
• When the end walls are welded to all the piles need to create a horizontal piping. Typically used herein beams or metal profiles.

Topic on the forum where you can ask or answer questions about the foundation on screw piles - Go to this topic.