RU181501U1 - Draft pile - Google Patents

Abstract

The utility model relates to the construction of electric power facilities, namely, to designs of driven piles for soils characterized by the presence of frost heaving. The technical result of the utility model is an increase in the load-bearing capacity of piles for pulling loads. The steel pile contains a hollow stepped trunk, the first wider section of which 1 designed for immersion to a depth below the active layer of heaving soil and made in the form of a pipe equipped with longitudinal blades 2. The second section 3 of the trunk It is dedicated for placement in the active layer area formed heaving soils polyhedral fasteners and connected to the first portion 1 of the barrel. Fasteners are made, for example, in the form of curly overhead connecting elements 4, welded to the outer surfaces of sections 1 and 3 of the barrel. Section 3 can be made in the form of a multifaceted pipe or a multifaceted truncated pyramid, tapering upward. 3 s.p. f-ly; 3 ill.

Description

Technical field

The utility model relates to the construction of electric power facilities, namely to the construction of driven piles for soils, characterized by the presence of frost heaving.

State of the art

Steel piles are often used to build foundations.

When building foundations in heaving soils, piles are subjected to frost heaving. Paddy soils are characterized in that they increase in volume. This leads to a rise in the soil surface during freezing and lowering of the soil surface during thawing. Freezing occurs from the surface of the soil deeper. The soil freezes to the outer surface of the pile, and rising, pulls the pile up. This pulling force is called the force of frost heaving. The magnitude of the frost heaving force depends on the type of soil and is proportional to the surface area of the part of the pile in contact with the soil in the area of the active soil layer, i.e. in the upper soil layer, characterized by seasonal freezing and thawing. The pile is held in the soil due to the frictional force on the outer surface of the part of the pile located in the soil below the active layer. In this case, the holding force is proportional to the surface area of the pile in contact with the soil in the area below the active soil layer.

Known pile with increased resistance to heaving, made in the form of a stepped pipe, while the diameter of the first section of the pile, at a depth below the active layer of the heaving soil, is larger than the diameter of the second part of the pile, immersed to the depth of the active layer of the heaving soil (RU2441964 C1, publ. 31.08. 2010). This pile is adopted as a prototype. This design has insufficient bearing capacity for pulling loads.

Utility Model Disclosure

The objective of this utility model is to increase the bearing capacity of pulling loads.

The object of the utility model is a steel pile containing a hollow stepped trunk, the first wider section of which is designed to be dipped to a depth below the active layer of heaving soil and made in the form of a pipe, characterized in that the first section of the barrel is equipped with longitudinal blades, and the second section of the trunk, designed for placement in the zone of the active layer of heaving soil, it is multifaceted and connected by fasteners to the first section of the trunk.

This allows you to increase the bearing capacity of piles for pulling loads.

The utility model has developments that specify the general concepts that characterize the declared pile, and are that:

- these fasteners are made in the form of curly overhead connecting elements welded to the outer surfaces of the first and second sections of the pile shaft;

- the second section of the pile shaft is made in the form of a multifaceted pipe;

- the second section of the pile shaft is made in the form of a multifaceted truncated pyramid, tapering up.

Implementation of a utility model, taking into account its development

The essence of the utility model is illustrated by a concrete example of the preferred execution, taking into account the development of the utility model.

In FIG. 1 shows a pile in the ground, a general view; in FIG. 2 - pile, top view. In FIG. Figure 3 shows an example of connecting sections of the barrel using fasteners.

The hollow stepped trunk of a steel pile contains:

- the first section 1 in the form of a pipe, on the outer surface of which longitudinally (i.e. located along the pipe) blades 2 are rigidly fixed (for example, by welding);

- the second section 3, made in the form of a truncated polyhedral (for example, hexagonal) pyramid, converging upward.

The multifaceted section 3 is connected to the first section 1 by fasteners made in the form of curly overhead connecting elements 4 (kerchiefs) welded to the outer surfaces of sections 1 and 3 of the pile shaft.

During the construction of the pile foundation, section 1 is immersed to a depth below the active layer of heaving soil, hammering the pile with blows to the upper end of the truncated pyramid of section 3, which is located in the active soil layer, subject to frost heaving. The length of section 3 is set by the project and is determined by the zonal boundary of seasonal thawing of soil 5 at the installation site of the pile foundation.

Section 3 of the pile shaft can be made of a multifaceted profile or bent steel sheet.

The presence of longitudinal blades 2 on the pipe of the trunk section 1 increases the surface interacting with the soil below the active layer, which increases the force holding the pile shaft in the zone not subject to frost heaving.

The implementation of section 3 of the pile shaft multifaceted and its connection with fasteners with section 1 reduces the area of contact of the pile shaft with the soil of the active layer and, thereby, reduces the pulling force of frost heaving.

The whole set of features of the first paragraph of the utility model provides an increase in the bearing capacity of piles for pulling loads, because increases the force holding the pile in the ground and reduces the pulling force of frost heaving.

The implementation of the upper section of the pile shaft in the form of a truncated polyhedral pyramid, tapering upwards, additionally reduces the area of contact of the pile shaft with the soil of the active layer, subject to frost heaving, which leads to a further decrease in the shearing forces and increases the anchoring ability of the pile.

Claims (4)

1. Steel pile containing a hollow stepped trunk, the first wider section of which is intended to be immersed to a depth below the active layer of heaving soil and made in the form of a pipe, characterized in that the first section of the barrel is equipped with longitudinal blades, and the second section of the trunk, designed to be placed in the zone of the active layer of heaving soil, it is multifaceted and connected by fasteners to the first section of the trunk. 2. The pile according to claim 1, wherein said fasteners are made in the form of curly overhead connecting elements welded to the outer surfaces of the first and second sections of the pile shaft. 3. The pile according to claim 1, in which the second section of the pile shaft is made in the form of a multifaceted pipe. 4. The pile according to claim 1, in which the second section of the pile shaft is made in the form of a multifaceted truncated pyramid, tapering upward.

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