RU2558832C1 - Method to erect screw pile in soil - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: method to erect a screw pile in soil includes submersion of a screw pile for rated depth and formation of a pile support after submersion. The screw pile is previously made from a hollow shaft, for instance, a metal pipe or metal plastic material, and one end designed for submersion, is equipped with helical blades along outer surface, and in the lower part of the shaft they perform at least two holes perpendicular to its axis, and at least one hole at the base of the pile. The pile support is formed by supply of a soil strengthening mixture into the hollow shaft of the pile. Specified holes are previously made in the specified part of the pile shaft under the blade evenly along the spiral, the angle of twisting of which matches the angle of lower blade twisting. The soil strengthening mix is supplied into the cavity of the pile shaft simultaneously with submersion of the pile so that supply of the soil strengthening mix into the shaft results in its even mixing with soil along trajectory of passage of helical blades of the pile and binds soil upstream the hole and the blade, forming a support from soil in the lower end of the pile shaft, so that the support covers blades and pile shaft in a volumetric manner.

EFFECT: increased reliability of a helical pile in soil in process of its operation, increased bearing capacity and resistance to various external differently directed force and pulse actions.

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Description

The present invention relates to the field of industrial and civil construction and can be used both in the construction of new and in the strengthening of the foundations of previously constructed buildings and structures, as well as in the construction of poles that accept alternating loads, and can be used in various soil conditions.

Known patent for utility model RU 116512 "SCREW PILES (OPTIONS)", publ. 07/25/2012. From the description of this patent, a method is known for erecting a screw pile in soil, including immersing in soil at the calculated depth of the screw pile and, after immersion, the formation of a pile support, while the screw pile is preliminarily made from a hollow shaft, for example, a pipe of metal or plastic material and one end intended for immersion, they are equipped with screw blades on the outer surface, and at least two holes perpendicular to its axis and at least one hole are made in the lower part of the barrel at the base of the pile, and the formation of the pile support is carried out after the screw pile is immersed in the ground by feeding a soil-strengthening mixture into the hollow shaft of the pile, which, being mixed uniformly with the soil along the path of the screw blades of the pile, binds to the reinforced soil layer and forms from the soil into parts of the lower end trunk piles of point supports.

Thus, a screw pile in the soil is obtained, in which there is a hollow skeleton and soil adjacent to its outer surface, which is opposite the hole mixed with a soil reinforcing concrete, for example, a mixture that forms a beam-like structure in the soil, which has point holes in the part of the pile pile contacts with the pile shaft.

This known method is selected as a prototype, since it has the largest number of essential features that match the essential features of the claimed invention.

However, the prototype has a significant drawback, namely low reliability during operation of the pile due to the formation of soil stability after installation of the pile support of low stability due to uneven hardening of the soil under the pile and on the sides due to the point connection of the soil-formed hardened beams with the shaft of the pile and the presence of point support at the end of the pile shaft, which generally reduces its effectiveness when performing the functions of a pile support during the construction of various construction objects.

This is because the holes in the hollow pile shaft are preliminarily made in such a way that during operation of the pile shaft they create a small support area around it, since the soil-strengthening mixture is fed through the lateral holes strictly horizontally (on the sides of the pile shaft) and through the lower the hole in the vertical direction (from the bottom of the pile shaft), therefore, some parts of the pile shaft are without support, and therefore a pile bearing with low bearing capacity is obtained.

In addition, since the soil-strengthening mixture is fed through the pile shaft into the soil after screwing the pile to the calculated depth, there is no uniform distribution of the soil-strengthening mixture in the soil around the pile shaft, respectively, the soil sections around the pile shaft remain loosened and unused.

The objective of the present invention is to provide a new method of erecting a screw pile in the soil with the achievement of the following technical result, namely, increasing the reliability of the pile during operation, in particular, by hardening the surrounding soil pile shaft with the formation of a pile support with increased bearing capacity and resistance to various external multidirectional power, including pulsed, effects.

The problem is solved due to the fact that in the known method of erecting a screw pile in the soil, including immersing in the soil to the estimated depth of the screw pile and after immersion the formation of the pile support, moreover, the screw pile is preliminarily made from a hollow shaft, for example, a pipe of metal or plastic material and one end intended for immersion is equipped with screw blades on the outer surface, and at least two holes are made in the lower part of the barrel perpendicular to its axis, and, at least at least one hole at the base of the pile, and the formation of the pile support is carried out by feeding into the hollow shaft of the pile of the soil strengthening mixture according to the present invention, said holes are preliminarily performed in the said part of the pile shaft under the blade uniformly in a spiral whose twist angle coincides with the twist angle of the lower blade, in this case, the filing of the soil-strengthening mixture into the cavity of the pile pile is carried out simultaneously with the immersion of the pile, so that feeding the soil-fixing mixture into the trunk leads to its uniform mixing with soil along the path of the screw piles of the pile and connects the soil corresponding to the hole and the blade, forming a support from the soil at the lower end of the pile shaft that surrounds the blades and shaft of the pile.

Thus, the claimed technical solution with its entire set of essential features can improve the reliability of the screw piles during operation.

The applicant conducted a patent information search on this topic, as a result of which the claimed combination of essential features was not identified. Therefore, the present invention can be recognized as new.

The compliance of this invention with the patentability criterion of "inventive step" is justified by the following.

This invention for a specialist does not follow logically from the prior art.

So, for example, all known methods of erecting screw piles in the soil, in the trunk of which holes are perpendicular to the axis of the trunk or at the lower end of the pile shaft, unevenly strengthen the soil during operation.

In particular, according to the prototype, hardening occurs under the end of the pile or along its sides through openings located above the blades. As a result, under the lower end of the pile shaft the soil is hardened and is a support for it. And on the sides of the trunk, the soil-strengthening mixture forms separate horizontally directed beams that fix the position of the pile. This leads to the fact that with external vertical force impact the pile rests on the strengthened soil under it, and with any other force action, due to the small footprint in the lateral soil, the pile shaft can be displaced and tilted. The soil-strengthening mixture or concrete in known screw piles is fed through the pile shaft into the soil after screwing the pile to the calculated depth, thus mixing the soil-strengthening mixture with soil around the pile is excluded, which also leads to possible displacement of the pile shaft.

In the claimed invention, the situation is different. It proposed to place the soil-strengthening mixture in the soil in the direction of screwing the pile shaft. At the same time, for example, through holes made under the lower blade evenly in a spiral, the twist angle of which coincides with the twist angle of the lower blade, this mixture is ejected, which goes along a spiral path, therefore the pile is compressed by the mixture with the trunk, and “petals spikes ”, which are an additional supporting heel for hardening the soil around the pile, and, therefore, an increase in the fixation of its vertical position is achieved, because the pile rests on them.

The essence of the claimed invention and the possibility of its practical implementation is illustrated by the description and drawing below.

The drawing shows a screw pile, where:

1 - trunk;

2 - soil;

3 - screw blade;

4 - holes located under the lower blade;

5 - holes located above the lower blade.

The method of construction of a screw pile in the soil is as follows. A screw pile containing a hollow shaft 1 is immersed in soil 2 to a design depth, wherein the hollow shaft 1 is preliminarily made of a hollow shaft, for example, pipes of a metal or plastic material and one end intended for immersion is equipped on the outer surface of at least one screw blade 3, and in the lower part of the trunk 1 piles perform 6-8 holes 4 located under the lower blade 3 evenly in a spiral, the twist angle of which coincides with the twist angle of the lower blade 3.

Additionally, approximately the same number of holes 5 can be made on the barrel, which are arranged evenly over the lower blade 3 in a spiral, and whose twist angle coincides with the twist angle of the lower blade.

Moreover, the holes 5 located above the lower blade 3 are displaced relative to the holes 4 located under the lower blade 3, while the holes 4 and 5 can have different diameters.

Simultaneously with the winding of the hollow shaft 1 of the pile, the soil-strengthening mixture or concrete is supplied under pressure directly through the shaft 1 of the pile and saturate the soil 2 through holes 4 and 5, which is evenly mixed with it along the path of the screw blades of the pile when screwing the pile. In addition, the soil, mixing with a soil-strengthened soil layer located below the lower blade, thereby increasing the bearing capacity of the piles.

As the soil-strengthening mixture penetrates into the soil, a beam-like hardening of the soil is formed under the blade, which becomes an additional support in the form of a blade of soil, impregnated with a soil-strengthening mixture, grasping and supporting the pile blade and covering the trunk in the lower part of the pile. Upon reaching the depth of the pile, the entire trunk is filled with concrete, and the pile shaft itself at this point is covered by the mentioned additional support.

Thus, a directional structure fixing its position is formed around the pile, consisting of soil adjacent to the pile and a soil-strengthening mixture, reinforcing the pile's grounding in accordance with the path of the pile blades, thereby increasing the reliability of adhesion of the near-pile soil between itself and the pile, thereby achieving the technical result of the claimed invention, namely, improving the reliability of a screw pile during its operation.

Claims (1)

A method of erecting a screw pile in the soil, including immersing in the soil to the calculated depth of the screw pile and after immersion the formation of a pile support, moreover, the screw pile is preliminarily made from a hollow shaft, for example, pipes of a metal or metal-plastic material and one end for immersion is equipped with screw blades at least two holes perpendicular to its axis, and at least one hole at the base of the pile, and the formation with Ain support are driven by feeding into the hollow shaft of the pile pile of soil strengthening mixture, characterized in that the said holes are preliminarily performed in the said part of the shaft of the pile under the blade evenly in a spiral, the twist angle of which coincides with the angle of twist of the lower blade, while the soil is fed into the cavity of the pile shaft of the pile produce simultaneously with the immersion of the pile, so that the filing of the soil fixing mixture into the barrel leads to its uniform mixing with the soil along the path of the screw blades of the pile and knits the soil in front of the hole and the blade, forming a support from the soil at the lower end of the pile shaft that surrounds the blade and pile shaft.