RU2738403C1 - Driven screw pile - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: invention relates to construction, namely to foundation construction. Driven screw pile includes nut fixed on soil surface and helical hollow barrel with cutting edges on end. Barrel is multistart with helical lines and helical curvilinear surfaces. Helical hollow barrel is made in form of connected along longitudinal edges with formation along perimeter from outside the shaft of screw lines and helical curvilinear multi-start surfaces in the form of helical grooves of convex shape with centres of curvature inside hollow cylindrical multi-threaded screw shaft and along perimeter inside screw shaft of longitudinal helical cutting edges along entire length of hollow screw shaft from its end cutting edges. Barrel is made of rectangular ribbons. Tapes are equipped with bevels at acute angle alongside edges β, first bent along helical lines on cylindrical first mandrel, with formation along perimeter of screw curvilinear surfaces in form of helical grooves of convex shape with centres of curvature inside these grooves. Strips after removal from the first mandrel, the diameter of which is equal to two radii of the convex-shaped grooves, were placed on the cylindrical second mandrel, the diameter of which corresponds to the through diameter of the hollow screw shaft.

EFFECT: technical result is simplification of manufacturing, expansion of technological capabilities, easier pile immersion into soil.

1 cl, 10 dwg

Description

The invention relates to construction, namely to foundation construction.

Known screw pile (see patent No. 2228402, 7 E02D 5/56, 10.05.2004, Bull. No. 13), including a helical hollow barrel of strips, equipped with cutting edges and secured to the soil surface with a nut, each of the strips is bent alternately in opposite sides at an angle of 140 ° along cuts made at an angle of 60 ° to each other and to the longitudinal edges of the strips, with the formation along the strip length of equilateral triangles located on the strip alternately in opposite directions, while the strips are connected to one another along the longitudinal edges at an angle 70 ° with the formation of three broken helical lines around the perimeter of the guides, at the break points of which - the vertices - are the points of convergence of four equilateral triangles - stiffeners.

The disadvantages of the known invention are the complexity of manufacture and limited technological capabilities, high resistance when pressing and screwing the pile into the ground.

The closest technical solution to this invention is a screw pile (see patent No. 2379421, B02D 5 / 56,20.01.2010, bull. No. 2), including a nut fixed to the soil surface, a screw hollow barrel with cutting edges made of one strip, rolled into cylindrical turns, connected to each other along the longitudinal edges, bent along the fold lines placed at an angle to its edges, with the formation of helical lines and helical surfaces along the outer and inner surfaces directed in one direction, in the form of curved pockets, which are the perimeter of the pile can be different not only in shape, but also in size, while the distance between the fold lines is equal to the sum of the lengths of the perimeters of the geometric shapes of the pockets of the inner and outer surfaces.

The disadvantages of the known invention are the complexity of manufacture and limited technological capabilities when screwing the pile into the ground, as well as the need to use powerful installations for driving the pile, the need to load the pile with an axial pressing load.

The technical solution to the problem is to simplify manufacturing, expand technological capabilities, and facilitate the immersion of the pile into the ground.

The technical solution is achieved by the fact that in a driven screw pile including a nut fixed on the soil surface and a screw hollow barrel with cutting edges at the end, made multi-threaded with screw lines and screw curved surfaces, characterized in that the screw hollow barrel is made in the form of longitudinal edges connected with the formation of helical lines and spiral curved multi-start surfaces in the form of convex helical grooves with centers of curvature inside the hollow cylindrical multi-start screw barrel and along the perimeter inside the screw barrel of longitudinal helical cutting edges along the entire length of the hollow screw barrel from its end cutting edges, along the perimeter outside the barrel moreover, the barrel is made of rectangular strips, provided with bevels along the side edges, at an acute angle β, first bent along helical lines on a cylindrical first mandrel, with the formation of helical curved surfaces along the perimeter in the form of convex helical grooves with centers of curvature inside these grooves, which, after being removed from the first mandrel, the diameter of which is equal to two radii of the convex grooves, were placed on a cylindrical second mandrel, the diameter of which corresponds to the bore diameter of the hollow screw barrel.

According to the data of the patent-technical literature, no technical solution similar to the claimed one was found, which allows one to judge the inventive level of the proposed driven screw pile.

The novelty lies in the fact that longitudinal helical cutting edges are formed along the perimeter, inside the screw shaft, along its entire length, from its end cutting edges, which facilitates the screwing and immersion of the driven screw pile into the ground, and expands the technological capabilities.

The novelty also lies in the fact that the helical hollow barrel with cutting edges at the end is made of rectangular strips provided with bevels along the side edges at an acute angle β, bent along helical lines on the cylindrical first mandrel, with the formation of helical curved surfaces in the form of helical convex grooves with centers of curvature inside these grooves, which, after being removed from the first mandrel, the diameter of which is equal to two radii of the convex grooves, are placed on a cylindrical second mandrel, the diameter of which corresponds to the bore diameter of the hollow screw barrel, and connected by known methods along the longitudinal edges located along the direction of pressing the barrel into the ground, which reduces the resistance of the soil when pressing in and screwing the driven screw pile into the ground.

The novelty is also due to the fact that, due to the convex outer screw multi-thread surfaces, when pressing and screwing in a hollow screw barrel, soil resistance decreases, since curved surfaces along the perimeter of the proposed screw barrel are connected along longitudinal edges located along the direction of pressing the barrel into the ground, which is Together with the specified geometric elements of the driven screw barrel, it expands the technological capabilities and reduces the resistance of the soil when immersing such a barrel.

The novelty lies in the fact that the helical hollow barrel with cutting edges at the end is made of rectangular strips provided with bevels along the side edges at an acute angle β, bent along helical lines on the cylindrical first mandrel, with the formation of helical curved surfaces in the form of helical grooves around the perimeter convex shape with centers of curvature inside these grooves, which, after being removed from the first mandrel, the diameter of which is equal to two radii of the convex grooves, are placed on a cylindrical second mandrel, the diameter of which corresponds to the bore diameter of the hollow screw shaft and connected by known methods along the longitudinal edges, which creates along the inner perimeter of the screw barrel longitudinal screw edges, facilitating the immersion of the screw barrel in the ground and reducing the forces required when pressing in to immerse it in the ground.

The novelty lies in the fact that the driven screw barrel is made of rectangular strips, provided with bevels along the side edges at an acute angle β, bent along helical lines in the transverse direction on the cylindrical first mandrel, with the formation of helical curved surfaces in the form of convex helical grooves around the perimeter with the centers of curvature inside these grooves, which, after being removed from the first mandrel, are placed on a cylindrical second mandrel, the diameter of which corresponds to the bore diameter of the hollow screw shaft and connected by known methods along the longitudinal edges, with the formation of helical lines and screw curved surfaces around the perimeter outside of the screw driven barrel. in the form of convex helical grooves with centers of curvature inside a hollow cylindrical multi-threaded screw barrel, which expands technological capabilities and simplifies manufacturing.

The novelty is also seen in the fact that the screwing-in of the driven screw barrel is carried out not only by multi-start channels of a convex shape along the outer perimeter, but also by longitudinal cutting edges along the inner perimeter, which expands technological capabilities and reduces soil resistance when screwing in and pressing the screw barrel into the ground.

The novelty is also due to the fact that the screw barrel along the perimeter is made of rectangular strips rolled in a vertical plane and connected in series along the length of the screw barrel, provided with bevels along the lateral edges, at an acute angle β rolled in a vertical plane in the longitudinal direction and bent along screw lines in the transverse direction, with the formation of helical lines and helical multi-threaded surfaces of a convex shape around the perimeter of the screw shaft with centers of curvature inside the screw shaft, which expands the technological capabilities, facilitates the immersion of the pile into the ground, and expands the technological capabilities.

The novelty of the proposed invention lies in the fact that the screw barrel has a smooth cross-section along its entire length, which ensures a decrease in soil resistance when the screw barrel is pressed into and screwed into the ground.

The novelty is also seen in the fact that the screw shaft is “screwed in” not only along the inner perimeter by multi-threaded channels of a curved shape and helical longitudinal cutting edges, but also along the outer perimeter with curved helical surfaces of a convex shape, which reduces the pressing forces and facilitates the pile's immersion into the ground.

The essence of the invention is illustrated by drawings, where: FIG. 1 - shows a driven screw pile immersed in the ground; in fig. 2 - screw pile shaft; in fig. 3 - section a-a in Fig. 2; in fig. 4 is a partial view 1 in FIG. 3; in fig. 5 is a front view of a rectangular tape with bevels; in fig. 6 - section b-b in Fig. 5; fig. 7 is a view of a rectangular tape with bevels bent along helical lines on a cylindrical first mandrel; in fig. 8 - section b-b in fig. 7; in fig. 9 is a view of two beveled tapes aligned on a cylindrical second mandrel, bent along helical lines on the first mandrel; in fig. 10 - section Г-Г in Fig. 9 with the alignment of the edges bent along helical lines on the first mandrel of rectangular beveled tapes.

The driven screw pile includes a screw shaft 1 and a nut 3 fixed on the ground surface 2, through which a screw shaft 1 is passed, having a head 4 (Fig. 1).

The hollow screw barrel 1 (Fig. 1 and Fig. 2) is made with outer curved convex surfaces 5, 6, 7, 8, 9, 10 with centers of curvature inside the hollow cylindrical multi-threaded screw barrel 1.

The helical hollow barrel 1 with cutting edges 11 at the end of the barrel 1 (Fig. 1, Fig. 2) is made of rectangular strips 5, 6, 7, 8, 9, 10, provided with bevels 12, 13 along the lateral longitudinal edges (Fig. 5, Fig. 6) at an acute angle β, bent along helical lines on the cylindrical first mandrel 14, with the formation of helical curved surfaces 5, 6, 7, 8, 9, 10 along the perimeter in the form of helical grooves 15, 16, 17, 18 , 19, 20 of a convex shape with centers of curvature inside these grooves, which, after being removed from the first mandrel, the diameter of which is equal to two radii of the convex grooves, are placed on the cylindrical second mandrel 21, the diameter of which corresponds to the bore diameter of the hollow screw barrel. The helical curved surfaces 5, 6, 7, 8, 9, 10 are connected to each other by known methods along the longitudinal edges - bevels 12, 13 in series, with the formation of helical lines 22, 23, 24, 25, 26 around the perimeter outside the screw shaft 1, 27 and screw curved multi-start surfaces in the form of screw grooves 15, 16, 17, 18, 19, 20 of a convex shape with centers of curvature inside the hollow cylindrical multi-start screw barrel 1 and along the perimeter inside the screw barrel 1 of the longitudinal helical cutting edges 22, 23, 24, 25, 26, 27 along the entire length of the hollow screw barrel 1 from its end cutting edges 11.

The pile is immersed by driving and pressing along the pile head 5. In this case, the pile, turning in the nut 4, is immersed in the ground 3.

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

Technical appraisal and economic advantages of a driven screw pile arise not only due to its execution as hollow, cylindrical, screw, multi-threaded and the creation of cylindrical helical lines and helical multi-threaded surfaces on its outer surface in the form of convex channels, which are not only screwed into the ground, but also provide due to the production of rectangular strips with bevels bent along helical lines on two cylindrical mandrels, which simplifies the manufacture and expands technological capabilities, but also the formation of longitudinal helical cutting edges along the entire length of the hollow helical barrel from its end cutting edges along the perimeter inside the screw barrel.

Claims (1)

Driven screw pile, including a nut fixed on the soil surface and a helical hollow barrel with cutting edges at the end, made multi-threaded with helical lines and screw curved surfaces, characterized in that the screw hollow barrel is made in the form of longitudinal edges connected to form around the perimeter outside the barrel helical lines and helical curvilinear multi-start surfaces in the form of helical grooves of a convex shape with centers of curvature inside a hollow cylindrical multi-start screw barrel and along the perimeter inside the screw barrel of longitudinal helical cutting edges along the entire length of the hollow screw barrel from its end cutting edges, and the barrel is made of rectangular tape shapes provided with bevels along the side edges, at an acute angle β, first bent along helical lines on a cylindrical first mandrel, with the formation of helical curved surfaces along the perimeter in the form of helical grooves of a convex shape with centers and the curvatures inside these grooves, which, after being removed from the first mandrel, the diameter of which is equal to two radii of the convex grooves, were placed on a cylindrical second mandrel, the diameter of which corresponds to the bore diameter of the hollow screw barrel.

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