RU109161U1 - SCREW PILES (OPTIONS) - Google Patents

Abstract

 1. A screw pile, including a cylindrical shaft, a tip with a spiral, characterized in that the cylindrical shaft of the pile is made in lengths from 1500 mm to 3000 mm, and the tip with a spiral is made in lengths from 500 mm to 1000 mm. ! 2. A screw pile according to claim 1, characterized in that the spiral is made with a spiral pitch of 35-40 mm and a spiral blade width of 10 mm. ! 3. The screw pile according to claim 1, characterized in that the thickness of the end of the tip cone is 25-30 mm. ! 4. A screw pile, including a cylindrical barrel, made stepped with a length of 1500 mm to 3000 mm, a tip with a spiral, characterized in that the cylindrical shaft consists of at least two sections made with diameters decreasing towards the tip from 140 mm to 70 mm, the tip with a spiral is made in lengths from 500 mm to 1000 mm. ! 5. A screw pile according to claim 4, characterized in that the spiral is made with a spiral pitch of 35-40 mm and a spiral blade width of 10 mm. ! 6. A screw pile according to claim 4, characterized in that the thickness of the end of the tip cone is 25-30 mm. ! 7. A screw pile, including a cylindrical barrel with a flange, a tip with a spiral, characterized in that the flange is made in the form of a ring with holes or a disk with diametrically located holes and a central hole. ! 8. A screw pile according to claim 7, characterized in that the flange is made from 8 mm to 10 mm thick, the holes are made from 10 mm to 15 mm in diameter. ! 9. The screw pile according to claim 7, characterized in that the cylindrical shaft of the pile is made with a length of from 1500 mm to 3000 mm, consists of at least two sections made with diameters decreasing towards the tip from 140 mm to 70 mm. ! 10. A screw pile according to claim 7, characterized in that the tip with a spiral is polished

Description

The utility model relates to the construction, in particular, to the construction of pile foundations, and can be used for the construction of low-rise houses, baths, terraces, greenhouses, hangars, pipelines, advertising structures, road signs and signs, supports for lighting and communication lines, landscape gardening furniture, fences and fences, the bases of solar panels and wind generators.

Known screw pile, which contains a barrel with a hollow tip, on the surface of which a spiral blade is located, and in the lower part a conical funnel is made, the longitudinal axis of symmetry of which coincides with the longitudinal axis of symmetry of the pile. The conical funnel is made with the possibility of pressing it into the cavity of the tip when the pile is immersed in the ground. (RF Patent No. 71668, IPC E02D 5/56, publ. March 20, 2008)

A device for mounting an object in the ground is known. The device is hollow, contains a cylindrical part in which an object (rod, pole, mast) is installed, and an anchor part for mounting in the ground. The anchor part is formed in one piece with the cylindrical part, made cone-shaped, has at least two conical parts with different taper angles. The conical part of the anchor is provided with a spiral. At the top of the cylindrical part, a hole is made for mounting the fastener. (German Patent No. 9313258, IPC Е04Н 12/22, publ. 24.03.1994).

The closest technical solution to the claimed utility model is a screw pile, including a cylindrical barrel 76 mm and a tip with a spiral. There is also known an embodiment of a screw pile, including a cylindrical shaft of the pile, made stepped, consisting of at least two sections made with decreasing diameters to the tip. There is also a known embodiment of a screw pile provided with a flange 8 or 10 mm thick with 12 mm holes. (Screw supports, http://glavzabor.ru/category3.php)

A disadvantage of the known structures is a narrow range of applications, i.e., an object can only be immersed in a pile. And also for dipping piles, you can use only one type of fastener.

The technical problem, the solution of which is claimed by the claimed utility model is to increase the reliability of the pile foundation, reducing the complexity of immersion of a screw pile into the soil by reducing the effort required to introduce the pile into the soil.

The stated technical problem is solved in that in a screw pile according to the first embodiment, comprising a cylindrical shaft, a tip with a spiral, a cylindrical shaft of a pile made in lengths from 1,500 mm to 3,000 mm, a tip with a spiral made in lengths from 500 to 1,000 mm.

The screw pile according to the first embodiment is characterized by the following additional significant features

- the spiral is made with a spiral pitch of 35-40 mm and a spiral blade width of 10 mm;

- the thickness of the tip cone end is 25-30 mm.

The stated technical problem is also solved by the fact that in a screw pile according to the second embodiment, comprising a cylindrical barrel made stepwise with a length of 1500 mm to 3000 mm, a tip with a spiral, a cylindrical barrel consists of at least two sections made with decreasing to the tip with diameters from 140 mm to 70 mm, the tip with a spiral is made in the length from 500 to 1000 mm.

The screw pile according to the second embodiment is characterized by the following additional significant features

- the spiral is made with a spiral pitch of 35-40 mm and a spiral blade width of 10 mm;

- the thickness of the tip cone end is 25-30 mm.

The stated technical problem is also solved by the fact that in a screw pile according to the third embodiment, comprising a cylindrical barrel with a flange, a tip with a spiral, the flange is made in the form of a ring with holes or a disk with diametrically located holes and a central hole.

The screw pile according to the third embodiment is characterized by the following additional significant features:

- the flange is made with a thickness of 8 mm to 10 mm, the holes are made with a diameter of 10 mm to 15 mm.

- the cylindrical shaft of the pile is made with a length of from 1500 mm to 3000 mm, consists of at least two sections made with diameters decreasing towards the tip from 140 mm to 70 mm.

- the tip with a spiral is made in a length of 500 to 1000 mm with a pitch of a spiral of 35-40 mm and a blade width of a spiral of 10 mm.

The technical result, the achievement of which is ensured by the implementation of the entire claimed combination of essential features, is to increase the reliability of the pile foundation, reducing the complexity of its immersion in the ground, which are provided by the claimed constructive design of a screw pile with an optimal choice of the geometric dimensions of its structural elements.

The inventive utility model is illustrated in the figure, where

figure 1 presents an example of a screw pile according to the first and second embodiments.

figure 2 presents the appearance of a screw pile with a cylindrical shaft with a stepped diameter (a) and flange options: (b) in the form of a ring, (c) in the form of a disk.

Screw pile (figure 1, 2) includes a cylindrical barrel 1, tip 2 with a spiral 3, which are hollow.

The cylindrical barrel 1 of the screw pile according to the first and second embodiment is made along the entire length with a constant diameter value and a length of 1500 mm to 3000 mm. The pile (the second embodiment) can be made with a constant diameter value along the entire length equal to 76 mm, which allows you to reliably install road signs, signs, advertising structures. The tip 2 is made in a length of 500 to 1000 mm. The length of the tip is selected depending on the reinforced structure in accordance with the requirements of reliability of fastening in operation. The thickness of the end of the cone 4 of the tip 2 is 25-30 mm, which reduces the complexity of its immersion in the ground

The spiral 3 is made with a spiral pitch of 35-40 mm and a spiral blade width of 10 mm.

The cylindrical barrel 1 of the screw pile according to the third embodiment (Fig. 2) is made stepwise with a length of 1500 mm to 3000 mm. The cylindrical barrel 1 consists of at least two sections 5 and 6, made with diameters decreasing towards the tip from 140 mm to 75 mm. The proposed implementation makes it possible to use pipes with a diameter of 70 mm to 140 mm for the manufacture of a pile foundation; pipes with a diameter of 76, 114, 140 mm are preferred, which allows installing on it from road signs and signs, advertising structures to baths, greenhouses and low-rise buildings. At least a portion of the cylindrical barrel is further provided with a spiral 11.

The tip 2 is made in a length of 500 to 1000 mm. The tip 2 is preferably performed with a thickness of the end 4 of the cone 25-30 mm, which reduces the complexity of its immersion in the ground

Spiral 3 is performed with a spiral pitch of 35-40 mm and a spiral blade width of 10 mm.

For fixing supports in a screw pile, known fixing means are used. For example, nuts 7 (Fig. 1) are welded to the pile for fastening the bolts. And the support, for example a pipe, when installed in a pile, is fastened in it with the help of bolts.

The pile is equipped with a flange 8 (figure 2) with a thickness of 8 mm to 10 mm with holes 9 for bolts or studs. Holes 9 are made with a diameter of 10 mm to 15 mm. The flange can be made in the form of a ring with diametrically located holes (figb) or in the form of a disk with diametrically located holes and a central hole 10 (figv). The diameter of the central hole 10 is preferably 24 mm for a bolt with a thread of 24 mm. Figures 2b and 2c show an example of a flange with six diametrically spaced openings 9. It is preferable to make a flange with a diameter of 220 mm with a distance between the centers of the diametrically spaced openings 167 mm. The presence of a flange simplifies and facilitates maintenance work on the installation of the foundation, ensures the stability of the structure. The various flange options available expand the range of application of piles.

When carrying out calculations and experimental work, the applicant concluded that the proposed size range of piles provides a reliable installation of the structure on various soils.

The reliability (bearing capacity) of the pile foundation depends on a number of factors that are taken into account when choosing the size of screw piles and the depth of immersion of piles, in particular on the total mass of the structure as the sum of all the loads acting on the foundation, snow and payload, depending on the purpose and area of location , strength and deformation characteristics of soils and other factors.

As an example, table 1 with the physico-mechanical properties of the inventive screw piles. Table 1 shows static loads with safety factors according to DIN 1054 and DIN 18800.

Table 1. VF size The size M _Rd (METAL) M _Rd (SOIL) F _{Rd, s} (DOWN) F _{Rd, t} (UP) F _{Rd, h} (SIDE) (mm) (kNm) (kNm) (kN) (kN) (kN) M24 76 × 1600 76.1 × 4.0 3,386 4,398 35.0 21.5 8.50 M24 76 × 2000 76.1 × 4.0 3,386 5,951 45.0 32,5 11.5 M24 76 × 2500 76.1 × 4.0 3,386 7,503 55.0 42.5 14.5 M24 76 × 3000 76.1 × 4.0 3,386 9,055 65.0 52,5 17.5 M24 90 × 1600 88.9 × 2.6 4,729 5,962 41.00 24.50 11.00 M24 90 × 2000 88.9 × 2.6 4,729 7,245 55.00 35.00 14.00 M24 114 × 1600 114.3 × 3.6 8,058 6,986 47.50 27,50 13.50 M24 114 × 2000 114.3 × 3.6 8,058 8,797 66.00 37.50 17.00 M24 114 × 3500 114.3 × 3.6 8,058 15.40 115.50 65.62 29.75 140 × 1400L 139.7 × 3.6 11,140 6,985 45.00 25.00 13.50 140 × 1600L 139.7 × 3.6 11,140 8,020 54.00 30.00 15.50 140 × l800L 139.7 × 3.6 11,140 9,055 63.00 35.00 17.50 140x2000L 139.7 × 3.6 11,140 10,090 72.50 40.00 19.50

Legend to table 1:

Rohrqu - outer diameter of a screw pile × wall thickness;

MRd (METAL) - bending moment of force necessary for deformation of the steel body of the screw pile;

MRd (METAL) - bending moment of force necessary for deformation of the steel body of the screw pile;

MRd (SOIL) - the bending moment of force necessary to displace the screw pile screwed into the ground from the vertical axis and calculated from the maximum horizontal (lateral) load;

FRd, c - maximum compressive (pressing down) load;

FRd, t - maximum pulling (pulling up) load;

FRd, h - maximum horizontal (lateral) load.

These calculated load values are valid for natural dense dry clay (TL and TM) soils and were obtained during static field tests using decreasing factors of 1.85 and 2. To convert from kilonewton (kN) to ton-force (tf), a decreasing coefficient is used 9.80665 (or 10).

As evidence of the reliability of the inventive screw piles, Appendix 1 presents the results of research tests of screw piles for pulling in natural (field) conditions, which were carried out together with Alt GTU (Department of Foundation Engineering) of Baranaul.

Lightweight constructions, in particular fences, billboards, road signs, signs, terraces, greenhouses, depending on the soil characteristics, are installed by immersing piles to a depth of 500 to 1300 mm, for this it is advisable to use screw piles with a length of 1500 to 2000 mm, diameter from 76 to 90 mm and a tip with a spiral of at least 500 mm. In particular, piles with sizes of 76 × 1500 mm, 76 × 1600 mm, 76 × 1800, 76 × 2000 mm, 90 × 1500, 90 × 1600 can be used. For foundations in the construction of low-rise houses, terraces, greenhouses, hangars on complex soils, it is advisable to use piles of 90 × 1500 mm, 90 × 1600 mm, 90 × 2000 mm, 114 × 1500 mm, 114 × 1600 mm, 114 × 2000 mm, 140 × 1500 mm, 140 × 1600 mm, 140 × 1800 mm, 140 × 2000 mm, 220 × 2700 mm, 220 × 3000 mm.

The implementation of piles equipped with a spiral tip from 500 to 1000 mm long with a spiral pitch of 35-40 mm and a spiral blade width of 10 mm is optimal to ensure high bearing capacity of the screw foundation, which is due to the fact that when the tip is immersed in the ground, the inter-turn gaps of the soil do not loosen, on the contrary, they are sealed with a spiral screw pile, increasing the reliability of the foundation, especially for complex soils.

The small area of contact with the soil (the thickness of the tip cone end is 25-30 mm) and the presence of a spiral with the proposed geometric dimensions do not create critical pressure even on soft peat and sandy soils and do not allow the foundation to move even with deep freezing of the soil and at the same time reduce the complexity of its immersion into the ground. Installation time takes only a few minutes.

The inventive screw pile is installed strictly vertically using special improvised means or machines. Installation time takes only a few minutes. Moreover, the contact area of the proposed screw pile foundation with the soil is insignificant compared to conventional foundations, due to this, such a foundation is much less susceptible to various kinds of movements, seasonal variations of the soil and distortions.

The foundation on the basis of such screw piles does not create critical pressure on soft and unstable soils, therefore, it can be installed without preliminary exploration. The use of this foundation is possible not only on complex soils, but also in earthquake-prone areas where ordinary concrete foundations can be damaged or destroyed, in addition, it is environmentally friendly and economical.

Claims (10)

1. A screw pile, including a cylindrical shaft, a tip with a spiral, characterized in that the cylindrical shaft of the pile is made in lengths from 1500 mm to 3000 mm, and the tip with a spiral is made in lengths from 500 mm to 1000 mm. 2. A screw pile according to claim 1, characterized in that the spiral is made with a spiral pitch of 35-40 mm and a spiral blade width of 10 mm. 3. The screw pile according to claim 1, characterized in that the thickness of the end of the tip cone is 25-30 mm. 4. A screw pile, including a cylindrical barrel, made stepped with a length of 1500 mm to 3000 mm, a tip with a spiral, characterized in that the cylindrical shaft consists of at least two sections made with diameters decreasing towards the tip from 140 mm to 70 mm, the tip with a spiral is made in lengths from 500 mm to 1000 mm. 5. A screw pile according to claim 4, characterized in that the spiral is made with a spiral pitch of 35-40 mm and a spiral blade width of 10 mm. 6. A screw pile according to claim 4, characterized in that the thickness of the end of the tip cone is 25-30 mm. 7. Screw pile, including a cylindrical barrel with a flange, a tip with a spiral, characterized in that the flange is made in the form of a ring with holes or a disk with diametrically located holes and a central hole. 8. A screw pile according to claim 7, characterized in that the flange is made from 8 mm to 10 mm thick, the holes are made from 10 mm to 15 mm in diameter. 9. The screw pile according to claim 7, characterized in that the cylindrical shaft of the pile is made with a length of from 1500 mm to 3000 mm, consists of at least two sections made with diameters decreasing towards the tip from 140 mm to 70 mm. 10. A screw pile according to claim 7, characterized in that the tip with a spiral is made from 500 mm to 1000 mm long with a spiral pitch of 35-40 mm and a spiral blade width of 10 mm.