RU2412307C1 - Screw pile - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: shaft fixed on surface of soil with nut is mounted from sections arranged of eight, ten, twelve, etc. of even number of equilateral triangles connected to each other by means of two lateral sides, at the same time sections are connected to each other by free third sides of triangles to form hollow helical shaft, along perimetre of which there are opposite four, five, six and more broken right and left helical lines to form inner four, five, six and more helical grooves, directed towards each other with identical pitch.

EFFECT: expansion of technological resources, increased rigidity and vibration stability in screw pile, including helical hollow shaft with cutting edges.

1 cl, 7 dwg

Description

The invention relates to construction, namely to foundation engineering.

Known screw pile, including a spiral hollow barrel of strips rolled into a screw in the longitudinal and transverse directions, equipped with cutting edges and a nut fixed to the surface of the soil through which the barrel is passed (see patent No. 2172373, 7 ЕДД 5/56, 08/20/2001 Bull. No. 23).

A disadvantage of the known piles is the great complexity and the complexity of manufacturing, since after twisting the strips relative to the longitudinal axis and connecting these strips along the longitudinal sides, it is also necessary to bend them in the transverse direction. Then, the strips fastened together are rotated and progressively moved at the same speed, while bending them along helical lines. 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, as well as limited technological capabilities.

The closest technical solution to this invention is a screw pile (see patent No. 2228402, 7 E02D 5/56, 05/10/2004, Bull. No. 13), including a hollow spiral hollow trunk of strips, equipped with cutting edges and fixed to the soil surface with a nut, each of the strips from which are alternately bent to opposite sides at an angle of 140 ° along 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, with this strip is connected to each other along the longitudinal edges at an angle of 70 ° with the formation along the perimeter of the guides of three broken helical lines, at the break points of which - the vertices - are the points of convergence of four equilateral triangles - stiffeners.

A disadvantage of the known piles is the great complexity and laboriousness of manufacturing, since it is necessary to first make cuts on the strip made at an angle of 60 ° to each other and the longitudinal edges of the strips, with the formation of equilateral triangles along the valley valley, alternating in opposite directions, while it is necessary to connect these strips at a strictly defined angle of 70 °, as well as limited technological capabilities, insufficient rigidity and vibration resistance.

The objective of the invention is the expansion of technological capabilities, increasing rigidity and vibration resistance.

The problem is solved due to the fact that in a screw pile, including a helical hollow shaft with cutting edges, fixed to the soil surface with a nut, according to the invention, the barrel is mounted from sections made of eight, ten, twelve, etc. an even number of equilateral triangles connected to each other by two lateral sides, while the sections are connected to each other by the free third sides of the triangles with the formation of a hollow helical trunk, along the perimeter of which are four, five, six or more broken right and left helical lines directed towards each other with the formation of internal four, five, six or more helical grooves directed towards each other with the same pitch.

According to the patent literature not found a technical solution similar to the claimed, which allows to judge the inventive step of the proposed screw piles.

The novelty is that the screw pile is made of the same elements - equilateral triangles, which simplifies the manufacture.

The novelty is due to the fact that helical lines and helical surfaces in the form of pockets of a polygonal shape are made along the inner and outer surfaces of the screw piles, which facilitates the immersion of the pile and expands the technological capabilities.

The novelty also lies in the fact that the pockets around the perimeter of the screw piles can be different not only in shape but also in size, which expands the technological capabilities.

The novelty lies in the fact that the shaft of the screw pile is multi-start, which not only facilitates immersion, but also reduces the time of immersion.

The novelty is also seen in the fact that the area of contact of the walls along the perimeter of the proposed design of the screw piles compared with the known screw piles increases, which increases the bearing capacity of the piles and allows, in comparison with the known screw piles, to reduce the wall thickness while maintaining rigidity and vibration resistance.

The invention is illustrated by drawings, where: in Fig.1 shows a screw pile, immersed in the ground; figure 2 - the shaft of the screw piles, General view, front view with sections assembled from 10 triangles; figure 3 is a section aa in figure 2; figure 4 - trunk of a screw pile, General view, front view with sections assembled from 8 triangles; figure 5 is a section bB in figure 4, figure 6 is a shaft of a screw pile, General view, front view with sections assembled from 24 triangles; Fig.7 is a section bb in Fig.6.

A screw pile includes a screw barrel 1 and a nut 4 fixed on the surface 2 of the soil 3, through which a barrel 1 having a head 5 is passed (Fig. 1). To facilitate immersion from the opposite end 5 of the barrel end face, cutting edges are made (not shown in the drawings). The shaft of a screw pile (FIG. 2, FIG. 3), for example, is assembled from sections 6 (FIG. 2), each of which is formed of ten equilateral triangles 7 of the same area in series (interconnected by a double line in FIG. 2) interconnected by two lateral sides 8 and 9, while sections 6 are interconnected by third, free sides 10 of triangles 7.

The vertices of the triangles form around the perimeter of the helical barrel 1 five right and five left broken helical lines (figure 2, figure 3) with the same step S ₁ and S ₂ . One of the five left broken helical lines in increments of S _{1 is} shown in FIG. 2 with a thickened line 11-12-13-14-15-16-17-17-18-19-20. One of the five right broken helical lines with step S _{2 is} shown in FIG. 2 with a thickened line 21-18-22-23-24-25-25-13-26-27.

Figure 4 shows a helical barrel, sections of which are assembled from eight equal equilateral triangles 28 (in figure 4, triangle 28 is shown by a double line) with the formation of four right and four left broken helical lines along the perimeter of the drum with the same pitch. Figure 4 shows the thickened lines 29-30-31-32-33-34 one of the four right broken helical lines in increments of S ₃ and 35-36-32-37-38-39 one of the four left broken helical lines in increments S ₄ .

Figure 6 shows a helical barrel, sections of which are assembled from 24 identical equilateral triangles 40 (shown in Fig. 7 by double lines) with the formation of twelve right and twelve left broken helical lines along the perimeter of the helical barrel directed towards each other. One of the 12 right broken helical lines in increments of S _{5 is} shown in FIG. 7 with a thickened line 41-42-43-44-45-46-47-48-49-59-51-52. One of the 12 left broken helical lines in increments of S _{6 is} shown in FIG. 7 with a thickened line 53-54-55-56-57-58-46-59-60-61-62-63.

Pile immersion is carried out by driving and indenting 5 piles along the tip. In this case, the pile, turning in the nut 4, is immersed in the soil 3.

The proposed design of piles can be used in any soil conditions of production work.

Claims (1)

A screw pile, including a hollow helical shaft with cutting edges, fixed on the soil surface with a nut, characterized in that the shaft is mounted from sections made of eight, ten, twelve, etc. an even number of equilateral triangles interconnected by two lateral sides, while the sections are connected to each other by the free third sides of the triangles with the formation of a hollow helical trunk, along the perimeter of which are four, five, six or more broken right and left helical broken towards each other lines with the formation of inner four, five, six or more helical grooves directed towards each other with the same pitch.

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