RU176898U1 - Hollow screw pile - Google Patents

Abstract

A hollow screw pile is proposed, consisting of a hollow shaft, in which a hole is made on the upper side, and two blades and a screw pile trunk guide are located in the lower part, while the ratio of the trunk diameters and blades is 1: 3. Hollow screw piles will be used in soils as devices working for pressing or pulling loads, for example, for fastening pipelines, supports, masts of power lines and other structures, can be used in the construction of moorings, foundations for light buildings, temporary and permanent fences and walling, etc. 1 s.p. f-ly, 1 ill.

Description

The utility model relates to construction, namely to foundation engineering, and is intended for use in soils as devices operating for pressing or pulling loads, for example, for fastening pipelines, supports, masts of power lines and other structures, during the construction of moorings, foundations for light structures, temporary and permanent fences, walling, etc.

Known screw pile [SU 366248, E02D 5/56, 01/16/1973], including the barrel with a screw thread.

The disadvantage of this pile is its high metal consumption, as well as the need to use powerful screwdrivers with significant torques for immersion. In addition, in order to extinguish the reaction of soil repulsion to the screw, the pile must be loaded with an axial pressing load.

Known screw pile, including a barrel with a screw thread [SU 727750, E02D 5/56, 04/15/1980], equipped with a nut located and fixed on the surface of the soil through which the barrel is passed.

However, such piles are complex and laborious to manufacture. A disadvantage of the known piles is the lack of rigidity and vibration resistance, especially for large in length and small in diameter screw piles.

In addition, a known screw pile, including a helical hollow trunk of strips, equipped with cutting edges and fixed to the soil surface with a nut [RU 2172373 C2, 7E02D 5/56, 08/20/2001].

A disadvantage of the known piles is the great complexity and the complexity of manufacturing, since it is necessary after bending the strips relative to the longitudinal axis and connecting these strips along the longitudinal sides to bend them in the transverse direction. Then, the strips fastened together are rotated and progressively moved at the same speed, while bending along helical lines. These operations can be performed using special equipment and machines.

A disadvantage of the known piles is also the lack of rigidity and vibration resistance, especially for large in length and small in diameter screw piles.

Known screw pile [RU 2228402 C2, 7 E02D 5/56, 05/10/2004], including a spiral hollow trunk of strips, equipped with cutting edges and secured to the soil surface with a nut, each of the strips is alternately bent to opposite sides at an angle of 140 ° along the notches made at an angle of 60 ° to each other and to the longitudinal edges of the strips, with the formation along the length of the strip of equilateral triangles located on the strip alternately in opposite directions, while the strips are connected to each other along the longitudinal edges at an angle of 70 ° to form the perimeter of the guides of three broken helical lines, at the break points of which are the vertices, there are places of convergence of four equilateral triangles - stiffeners.

The disadvantages of the known piles are the great complexity and the complexity of manufacturing, since it is necessary to first make cuts on the strip at an angle of 60 ° to each other and the longitudinal edges of the strips, with the formation along the length of the strip of equilateral triangles located alternately in opposite directions. In this case, it is necessary to connect these bands at a strictly defined angle of 70 °.

The practice of using such piles has shown that the main drawback of their design is the large moment of screwing the piles, which limits the diameter of the trunk, the depth of immersion and, as a result, the bearing capacity of the piles, especially in loose, compressible soils.

The objective of the utility model is the minimum cost of production of a screw pile, while it must be possible to dismantle it with subsequent installation in another place during the construction of temporary enclosing structures. In this case, the number of components of the screw piles should be minimal.

A screw pile consists of a hollow trunk 1, a hole or cutout 2, blades 3 and guides 4.

To reduce the number of constituent elements of a hollow screw pile, its design is proposed, consisting of a hollow shaft 1, in which a hole (or cut) 2 is made on the upper side for screwing the pile into the ground, with two blades 3 and a guide located in the lower part of the shaft trunk 4 screw piles. The shape of the blades 3 may be different. Moreover, the blades 3 are attached to the outer part of the trunk of the barrel 1 by any known method, for example, welded. The lower edges of the blades 3 protrude beyond the lower end of the barrel 1 of the screw pile by a certain size “a”, which depends on the diameter of the barrel 1 and the size and shape of the blades, as well as the material into which the pile is to be screwed. The approximate ratio of the diameter of the barrel and the diameter of the blades is 1: 3.

When installing a screw pile with size "a" provide easy penetration of the screw pile into the ground.

The guide 4 provides preparation of the soil for deepening, and ensures screwing the screw piles during installation, while part of the loosened soil when screwing enters the barrel 1, which further reduces drag when screwing the pile. In the construction of permanent structures, to prevent corrosion of the screw pile after its installation and to give additional stability, the screw pile is filled with a composition that prevents corrosion, for example, concrete.

The guide 4 is made in the form of an isosceles triangle, flat or curved along its bisector AB, the CD size of the guide 4 is equal to or slightly greater than the diameter of the barrel 1 of the screw pile.

The intake of soil during the installation of a screw pile inside the hollow trunk 1 reduces the resistance to screwing a screw pile.

To facilitate screwing, special equipment is used for drilling wells or gas drills, and a special device is purchased or manufactured to screw the screw piles through the cutout 2 or directly through the hollow barrel 1. If necessary, the installation of screw piles is performed in pre-made holes with a diameter smaller or equal to the diameter of the hollow trunk 1. With a small diameter of the hollow trunk 1, the installation of hollow screw piles is performed manually, without prior Making a hole them.

During the construction of foundations after installation, all piles are trimmed to the required height and special heads are installed on the trimmed parts. After installation, it is filled with concrete to prevent corrosion and give additional rigidity to a hollow screw pile.

The advantage of the proposed hollow screw piles is the low cost of its production, as well as the possibility of its dismantling with subsequent installation in another place during the construction of temporary enclosing structures. Hollow screw piles will be used in soils as devices working for pressing or pulling loads, for example, for fastening pipelines, supports, masts of power lines and other structures, can be used in the construction of moorings, foundations for light buildings, temporary and permanent fences and walling, etc.

Information sources

1. Screw pile SU 366248, E02D 5/56, 01/16/1973.

2. Screw pile SU 727750, E02D 5/56, 04/15/1980.

3. Screw pile RU 2172373 C2, 7E02D 5/56, 08/20/2001

4. Screw pile RU 2228402 C2, 7 E02D 5/56, 05/10/2004

Claims (2)

1. A hollow screw pile, consisting of a hollow shaft, in which a hole is made on the upper side, and two blades and a screw pile trunk guide are located in the lower part, characterized in that the blades are attached to the outer part of the hollow shaft, with the ratio of barrel diameters and blades equal to 1: 3. 2. A hollow screw pile according to claim 1, consisting of a hollow shaft, in which a hole is made in the form of a cutout on the upper side, and two blades and a screw pile shaft guide are located in the lower part, characterized in that the blades are attached to the outer part of the hollow shaft .

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