RU120426U1 - PILOT SCREW - Google Patents

Abstract

 A screw pile, including a metal pipe with an anticorrosive coating, with a conical lower part, a metal winding in the form of one turn of a blade located on the conical part of the pipe, characterized in that the conical part of the pile is made in the form of a pyramid with at least three faces, the width of the winding blade is at least 1/3 of the outer diameter of the pipe, the pitch of the blade is from one to two outer diameters of the pipe, and at least one technological miles.

Description

The utility model relates to construction and can be used for the construction of pile foundations of non-massive low-rise buildings and structures, for example, frame, panel, timber and log houses.

Known screw pile, including a hollow shaft with a support element at its upper end and a helical blade at the lower (patent RU No. 49841, IPC E02D 5/56, publ. 10.12.2005). A disadvantage of the known piles is the lack of anti-corrosion coating on the outer and inner surfaces of the hollow trunk, which leads to the rapid destruction of piles in aggressive soils.

Known screw pile, comprising a hollow metal pipe with a corrosion-resistant coating of its outer and inner surfaces, equipped with screw winding in the form of a blade extending along the entire length of the pipe (patent RU No. 2304664, IPC E02D 5/56, publ. 08.20.2007). The disadvantages of the known piles are:

- excessive length of the screw winding, increasing the cost of the pile, since when the pile is twisted into weak soils, the winding in its upper part becomes redundant;

- the absence of a supporting element at the upper end of the pile, which does not provide a stable and reliable connection of the pile with the upstream structure.

The closest in technical essence to the claimed utility model, selected as a prototype, is a screw pile, including a cylindrical pipe made in a metal body with an anti-corrosion coating, with a conical lower part, a metal winding in the form of one turn of a blade located on the conical part of the pipe ( RU patent No. 93412, IPC E02D 5/56, publ. 04/27/2010).

The disadvantages of the prototype are:

- difficult entry of piles into hard soil;

- the impossibility of varying the pitch of the blade depending on the type of soil;

- the impossibility of screwing piles manually without the use of special equipment.

The task, which the utility model is aimed at, is the elimination of these shortcomings, the improvement of screw piles.

The technical result consists in the creation of a screw pile, easily entering the soil of various densities, with the ability to change the pitch of the winding blade depending on the density of the soil, changing the width of the blade based on the calculated load on the designed foundation and the design features of the constructed object, which will allow you to calculate the optimal number of piles, the distance between them and reduce costs, as well as install piles manually without the use of special equipment.

The technical result is achieved in that in a screw pile, including a metal pipe with an anti-corrosion coating, with a conical lower part, a metal winding in the form of one turn of a blade located on the conical part of the pipe, the conical part of the pipe is made in the form of a pyramid with at least three faces, the width of the winding blade is at least 1/3 of the outer diameter of the pipe, the pitch of the blade is from one to two outer diameters of the pipe, and at least at the upper end of the pipe on its side surface one technological hole. The execution of the conical part of the pipe in the form of a pyramid allows you to easily, effortlessly introduce a pile into the soil of any density by cutting (countersinking) the soil when screwing the piles. The width of the metal winding blade directly affects the bearing capacity of the pile - the larger the width of the blade, the greater the area of the pile support in the soil, the higher its bearing capacity. In practice, this makes it possible, by changing the width of the winding blade, based on the calculated load on the designed foundation and the design features of the object being built, to determine the required number of piles, the distance between them and optimize the cost of building the foundation. The pitch of the metal winding blades is selected depending on the type of soil: from one to 1.3 of the outer diameter of the pipe - for hard soil, from 1.3 to two of the outer diameter of the pipe - for soft soil. Changing the pitch of the winding blade depending on the type of soil contributes to an increase in torque without disturbing the structure of the soil between the turns of the blade. When screwing the piles, the inter-turn gaps of the soil do not loosen, but, on the contrary, are compacted by the blade of the pile, which increases its bearing capacity. The technological hole is intended for manual installation of small piles in places where the use of equipment is impossible or inefficient, which reduces the cost of installing such piles.

The utility model is illustrated by drawings, where:

figure 1 - pile screw, General view;

figure 2 - the tip of the pile.

A screw pile includes a metal pipe 1, in the lower part of which there is a closed conical part 2, made in the form of a pyramid with at least three faces, with a screw blade 3, the width of which is at least 1/3 of the outer diameter of the pipe 1, with a pitch of the blade 3 from one to two outer diameters of the pipe 1, at least one technological hole 4 is made in the upper part of the pipe 1 on its lateral surface.

The diameter, length of the pile, the number of faces of the tip, made in the form of a pyramid, is selected depending on the soil, the design load and the depth of immersion of the pile, and based on the selected diameter of the pile and the design load, the width and pitch of the winding blades on the conical part of the pile are determined.

Installation of piles is as follows.

At the dive site of screw piles, soil is probed and, depending on its type, piles with a pitch of blade 3 of one to two outer diameters of pipe 1 are selected: from one to 1.3 diameters for solid soil, from 1.3 to two diameters - for soft soil, then mark the pile field and then screw the piles to the required (predetermined) depth using a special technique or technological hole 4 in the upper part of the pipe, mark the top of the piles according to the level and cut to the design mark. After that, a high-strength cement composition with or without reinforcement is poured to the top of each pile, depending on the calculated load, a metal support area is welded to the upper end of each pile or, by welding, a metal channel is used at the upper ends of the piles, which is used as a grill.

In the manufacture of piles in the factory, a metal tip in the form of a pyramid with at least three faces is welded to a metal pipe and an anti-corrosion coating is applied to the outer surface of the pile.

The use of a screw pile, made in accordance with the claimed utility model, allows, compared with the prototype, to easily, effortlessly introduce a pile into the soil of any density by cutting (countersinking) the soil when screwing the pile, change the pitch of the winding blade depending on the type of soil, change the width the blades based on the estimated load on the designed foundation and the design features of the constructed object, which will allow you to calculate the optimal number of piles, the distance between them and reduce costs, as well as setting pile piles of small diameter manually without the use of special equipment.

Claims (1)

Screw pile, including a metal pipe with an anti-corrosion coating, with a conical lower part, metal winding in the form of one turn of a blade located on the conical part of the pipe, characterized in that the conical part of the pile is made in the form of a pyramid with at least three faces, the width of the winding blade is at least 1/3 of the outer diameter of the pipe, the pitch of the blade is from one to two outer diameters of the pipe, and at least one technological miles.