RU2587399C1 - Screw pile - Google Patents

Screw pile Download PDF

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Publication number
RU2587399C1
RU2587399C1 RU2015112073/03A RU2015112073A RU2587399C1 RU 2587399 C1 RU2587399 C1 RU 2587399C1 RU 2015112073/03 A RU2015112073/03 A RU 2015112073/03A RU 2015112073 A RU2015112073 A RU 2015112073A RU 2587399 C1 RU2587399 C1 RU 2587399C1
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Russia
Prior art keywords
pile
shaft
tip
hole
spiral
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RU2015112073/03A
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Russian (ru)
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Общество с ограниченной ответственностью ДЭЙТЭРИЧ ИНВЕСТМЕНТС
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Priority to RU2015112073/03A priority Critical patent/RU2587399C1/en
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Publication of RU2587399C1 publication Critical patent/RU2587399C1/en

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    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/22Piles
    • E02D5/56Screw piles

Abstract

FIELD: construction.
SUBSTANCE: invention relates to construction of pile foundations. Screw pile includes shaft with tip at one end and functional head rigidly fixed on the other end, containing spiral sections. Pile shaft is made from metal strip, deformed in form of solid spiral with pitch from 40 to 400 mm, along whole length, except for upper end left flat, wherein head comprises tube section square or rectangular, or round section in wall of which are parallel vertically oriented slots, which width corresponds to thickness of upper end of pile shaft, which it is put on it, and is rigidly fixed, for example, welding, wherein upper end of pile shaft is pointed, in it there is through bore aligned with at least one through hole made in wall of functional head. Above level of said through hole there is at least one attachment of tubular support element, fixed by outer structure arranged in cavity of functional head.
EFFECT: reducing material consumption of pile, labour intensity and energy intensity of its production, as well as increased reliability of its operation.
7 cl, 2 dwg

Description

The invention 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 of 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, the surface of which is equipped with a screw blade, and a conical funnel is made in the lower part, 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 (see RU No. 71668, E02D 5/56, 2008).

The disadvantage of this solution is the impossibility of using it on dense soils, since a highly developed screw blade will not allow it to “screw” the pile into the soil, in addition, the internal cavity of the pile is open to the environment, which can lead to intense corrosion of the internal space or require the application of a protective coating to the inner cavity of the pipe.

Also known is a screw pile, including a shaft with a tip at one end and a functional head rigidly fixed at its other end, containing spiral sections (see RU No. 109161 E02D 5/56, 2010). In this case, the cylindrical shaft of the pile is made from 1500 mm to 3000 mm long, only the pile tip is provided with spiral sections, which is made from 500 mm to 1000 mm long, and the spiral itself is made with a pitch of 35-40 mm turns and a spiral blade width of 10 mm.

The disadvantage of this solution is the increased complexity and energy consumption of the manufacture of piles due to the large number of technological operations (the operation of forming the cone of the pile, the manufacture of a spiral tape and its welding to the surface of the tip) and the energy consumption for heating the pipe billet for the subsequent formation of the conical section (tip) of the pile and welding spirals, in addition, the material consumption of the pile is large due to a sufficiently large cross-sectional area, in addition, the risk of corrosion of welds on the cont This spiral with the pile shaft reduces its reliability over a long period of use, in addition, the bearing capacity of the pile in weak, for example, marshy soils is insufficient, since a spiral surface that is poorly developed in area (located only on the tip) will not allow for sufficient adhesion to the enclosing array composed weak soils.

The problem to which the claimed invention is directed is expressed in reducing the material consumption of the pile, reducing the complexity and energy consumption of its manufacture, as well as increasing the reliability of its operation.

The technical result obtained by solving the problem is expressed in the reduction of the material consumption of the pile (the total cross-sectional area is reduced compared to the tubular trunk); reducing the complexity and energy consumption of its manufacture (the operations of forming the pile cone, manufacturing of the spiral tape and its welding to the tip surface are excluded, in addition, energy consumption for heating the pipe billet for the subsequent formation of the pile tip and welding the spiral to it is excluded), reliable fixation of the pile is ensured when a wide range of changes in the bearing capacity of the soil due to the larger area of the spiral surface of the pile, located along the entire length of its trunk (in fact, its component. th spiral deformation of the strip (which does not have in the unstrained as bending stiffness) gives the "spiral rod", made out of it, sufficient flexural rigidity, they enable pile clogging, not only the rotation.

To solve the problem, a screw pile, including a shaft with a tip at one end and a functional head rigidly fixed at its other end, containing spiral sections, is characterized in that the pile shaft is made of a metal strip deformed in the form of an integral spiral with a pitch of 40 to 400 mm along the entire length, except for the upper end left flat, while the head contains a segment of a pipe of square, or rectangular, or circular cross section, in the wall of which parallel vertically oriented slots, the width of which corresponds to the thickness of the upper end of the pile shaft, with which it is put on it, and is rigidly fixed, for example, by welding, while the upper end of the pile shaft is pointed, it has a through hole coaxial with at least one through hole made in the wall of the functional head, in addition, above the level of this through hole there is at least one means of fastening the tubular support element, a fixed external structure located in the cavity of the functional head. In addition, the means of fastening the tubular support element is made in the form of a through hole made in the wall of the functional head and provided with a thread with the possibility of placing a locking bolt in it, and at least three of them equally spaced from each other. In addition, the tip of the pile is made in the form of a point at its end. In addition, the width of the metal strip is from 50 to 200 mm, the thickness is from 3 to 25 mm. In addition, the length of the pile shaft is from 200 to 4500 mm. In addition, the pointed end of the pile is 45-60 ° and has beveled edges at an angle of 45 °. In addition, the part of the pile shaft immersed in the soil is made with faces beveled at an angle of 20 to 80 ° to the axis of the pile shaft.

A comparative analysis of the features of the claimed solution with the signs of the prototype and analogues indicates the conformity of the claimed solution to the criterion of "novelty."

The features of the characterizing part of the claims provide the solution to the following functional problems.

The signs “the pile shaft is made of a metal strip deformed as a whole spiral” provide the possibility of reducing the material consumption of the pile (the total cross-sectional area is reduced compared to the tubular shaft); provide the ability to reduce the complexity and energy consumption of its manufacture (the manufacturing operations of the spiral tape and its welding to the surface of the tip and piles are excluded, in addition, the energy consumption for heating the pipe billet for the subsequent formation of the pile tip and welding the spiral to it is excluded), reliable fixation of the pile is ensured when a wide range of changes in the bearing capacity of the soil due to the larger area of the spiral surface of the pile located along the entire length of its trunk (in fact, its component ), while the spiral deformation of the strip (which does not have bending stiffness in an undeformed form) gives the “spiral rod” made of it sufficient bending stiffness, which allows the pile to be installed by blocking, and not just rotation.

Signs indicating that the spiral is made with a “pitch of 40 to 400 mm” provide the opportunity to optimize the spiral deformation of the strip, depending on the required length of the pile and the strip used for its manufacture.

Signs indicating that the upper end of the spiral is left flat, provide the ability to easily and reliably connect the barrel to the tip.

Signs indicating that "the head contains a section of pipe of square, or rectangular, or circular cross-section", provide the ability to place in it and securely fasten the supporting element (such as a fence post, billboard support, etc.).

Signs indicating that “parallel, vertically oriented slots are made in the wall of the pipe segment, the width of which corresponds to the thickness of the upper end of the pile shaft, with which it is worn on it, and is rigidly fixed, for example, by welding”, provide the possibility of reliable fastening of the pile shaft with the head and pile immersion by impact on the tip.

Signs indicating that the “upper end of the pile shaft is pointed” provide the possibility of fixing the lower end of the support element (such as a fence post, billboard support, etc.), made as a tubular rod or a wooden column element, which eliminates the possibility of arbitrary tilt this element with a shear effect on its part protruding from the head.

Signs indicating that at the upper end of the pile shaft "a through hole is made, coaxial with at least one through hole made in the wall of the functional head", provide, if necessary, immersion of the pile by screwing it into the ground, without risk of damage to its upper part .

Signs indicating that "at least one means of securing the tubular support element, a fixed external structure located in the cavity of the functional head" is located above the level of this through hole of the pile shaft, provide clamping of the tubular support element above its supporting surface

The signs of the second claim provide reliable fixation of the tubular in the head, reveal a possible implementation of the fastening means.

The features of the third paragraph of the claims "simplify the design of piles and reduce the effort required for its shock immersion.

The signs of the fourth and fifth claims allow you to vary in a wide range of characteristics of piles, depending on the conditions of its use.

The signs of the sixth claim make it possible to increase the “cutting” characteristics of the pile tip and reduce its penetration resistance in the presence of solid inclusions in the soil.

The signs of the seventh claim allow to increase the "cutting" characteristics of the side edges of the piles and reduce the resistance to its introduction in the presence of solid inclusions in the soil.

The claimed pile is illustrated by drawings, where in FIG. 1 shows a general view of a pile with a rectangular tubular head; in Fig.2 shows a longitudinal section of a screw pile.

The drawings show the barrel 1 with a tip 2, a functional tip 3, a pipe segment 4, its wall 5, a through hole 6 in the wall 5, a locking bolt 7, the upper (flat) end 8 of the barrel 1, its taper 9, the face 10 of the pile, the axis 11 of the barrel 1, the second through hole 12 in the wall 5, coaxial with the hole 13 made at the upper end 8 of the barrel 1, the beveled edges 14 of the tip 2, slots 15, support legs 16.

The barrel 1 of the screw pile is made of a metal strip deformed along its length (except for the upper end 8, left flat) in the form of a solid spiral with a pitch of 40 to 400 mm, while the strip width is from 50 to 200 mm, the thickness is from 3 to 25 mm , while maintaining constant values of these parameters along the entire length of the barrel. In addition, the part of the pile shaft 1 immersed in the soil is made with faces 10, beveled at an angle from 20 to 80 ° to the axis 11 of the pile shaft. The length of the barrel 1 can vary from 200 to 4500 mm. The upper (flat) end 8 of the barrel 1 is provided with a taper 9 and a through hole 13.

The tip 2 of the pile is made in the form of a sharpening at its immersed end at an angle of 45-60 ° and has beveled edges 14 at an angle of 45 °, which reduces the complexity of immersion of the pile in the ground.

The functional head 3 of the pile is made in the form of a rigidly fastened pipe segment 4 (square, or rectangular, or round), in the wall 5 of which at least one through hole 6 (preferably at least three) is made, provided with a thread with the possibility of placement in it locking bolt 7. In addition, parallel vertically oriented slots 15 are made in the head wall, the width of which corresponds to the thickness of the upper end 8 of the pile shaft with which it is worn, and is rigidly fixed, for example, by welding. In addition, below the row of through holes 6 in the wall of the head made at least one, and preferably two diametrically opposite second through holes 12, coaxial with the hole 13 made at the upper end 8 of the barrel 1.

This embodiment of the functional head 3 provides fastening of the support posts 16, structures supported by piles, while the part inserted into the cavity of the head 3, for example, a support pipe for a road sign, is fastened to the pile with the help of locking bolts 7 screwed into the holes 6 until they abut against the surface of this pipe.

When carrying out calculations and experimental work, the applicant concluded that the proposed design of screw piles provide 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.

The execution of the trunk 1 piles of a metal strip deformed along the entire length in the form of a solid spiral with a pitch of 40 to 400 mm, while the strip width is from 50 to 200 mm, the thickness is from 3 to 25 mm, the length is from 200 to 4500 mm, is optimal for ensuring high bearing capacity of the screw foundation, in a wide range of soil bearing characteristics, which is due to the fact that when the tip is immersed in the soil, the inter-turn gaps of the soil do not loosen, but rather are sealed with a spiral screw pile, snug against it, increasing reliability undamenta, especially for difficult soils.

The small area of contact with the soil of the front end of the pile (tip 2, pointed at an angle of 45-60 ° and having beveled edges 14 at an angle of 45 degrees) simplifies its immersion in the ground, and the presence of a spiral with a developed foot area with the proposed geometric dimensions does not create critical pressure even on soft peat and sandy soils and do not allow the supported structure to sink or extrude upward, even with deep freezing of the soil.

The inventive screw pile is installed strictly vertically. Further, holding it in this position, they strike at the upper end of the pile (directly on the free surface of its head). Due to the helicity of the pile shaft, the shock load is converted into rotational. At the same time, due to the small cross-section of the pile and the sharpness of the edges of the spiral, screwing the pile into the ground is ensured without any special destruction of the latter, which contributes to a higher value of the pull-out resistance of the pile compared to the known piles with a cylindrical shaft (with identical external diameters of the piles). During installation, use a hand tool (if the length and cross section of the piles are relatively small and the soil is not very dense). If the length of the piles exceeds 2 m, and the diameter of the cross section is more than 100-120 mm, then special improvised tools or machines are used. Installation time takes only a few minutes. Moreover, the area of contact between the formed screw pile foundation and the ground is large compared to conventional foundations, so that such a foundation is much better held in the ground.

If it is assumed that the pile is immersed by rotation, then a metal rod, for example scrap, a mount, etc., is passed through the second through holes 12 and the hole 13 of the barrel 1. (not shown in the drawings) and after several blows to the head, rotate the pile to the side, ensuring its screwing, which ensures its immersion in the ground. When the tip of the pile rests in a solid inclusion, the latter is broken by striking the pile head, after which screwing is continued.

Claims (7)

1. A screw pile, including a shaft with a tip at one end and a functional head rigidly fixed to its other end, containing spiral sections, characterized in that the pile shaft is made of a metal strip deformed in the form of an integral spiral with a pitch of 40 to 400 mm , along the entire length, except for the upper end, left flat, while the head contains a section of pipe of square, or rectangular, or circular cross section, in the wall of which parallel vertically oriented slots are made, the width of which corresponds to corresponds to the thickness of the upper end of the pile shaft, with which it is worn on it, and is rigidly fixed, for example, by welding, while the upper end of the pile shaft is pointed, it has a through hole coaxial with at least one through hole made in the wall of the functional head, in addition, at least one means of fastening the tubular support element, a fixed external structure, located in the cavity of the functional head, is located above the level of this through hole.
2. A pile according to claim 1, characterized in that the means of fastening the tubular support element is made in the form of a through hole made in the wall of the functional head and provided with a thread with the possibility of placing a locking bolt in it, with at least three equally spaced from each other.
3. The pile according to claim 1, characterized in that the tip of the pile is made in the form of a point at its end.
4. A pile according to claim 1, characterized in that the width of the metal strip is from 50 to 200 mm, the thickness is from 3 to 25 mm.
5. The pile according to claim 1, characterized in that the length of the pile shaft is from 200 to 4500 mm
6. The pile according to claim 3, characterized in that the tip end of the pile is 45-60 ° and has beveled edges at an angle of 45 °.
7. The pile according to claim 1, characterized in that the part of the pile shaft immersed in the soil is made with faces beveled at an angle of 20 to 80 ° to the axis of the pile shaft.
RU2015112073/03A 2015-04-02 2015-04-02 Screw pile RU2587399C1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU188948U1 (en) * 2018-11-28 2019-04-30 Федеральное государственное бюджетное образовательное учреждение высшего образования "Санкт-Петербургский государственный архитектурно-строительный университет" Screw piled

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU1645368A1 (en) * 1989-04-24 1991-04-30 Брестский инженерно-строительный институт Screw pile
KR20100015601A (en) * 2007-04-09 2010-02-12 츠네오 고토 Spiral steel pipe pile
KR20120046666A (en) * 2010-11-02 2012-05-10 도끼타미와 Base construct method of building and base construct member of building
KR101283689B1 (en) * 2012-12-18 2013-07-08 (주) 금성산업 Structure of reinforcement supporter for traffic safety facility

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU1645368A1 (en) * 1989-04-24 1991-04-30 Брестский инженерно-строительный институт Screw pile
KR20100015601A (en) * 2007-04-09 2010-02-12 츠네오 고토 Spiral steel pipe pile
KR20120046666A (en) * 2010-11-02 2012-05-10 도끼타미와 Base construct method of building and base construct member of building
KR101283689B1 (en) * 2012-12-18 2013-07-08 (주) 금성산업 Structure of reinforcement supporter for traffic safety facility

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Catalog SB-Spiral Pile,[он-лайн]. SUNGBO E&T Co., Ltd 2012 [найдено 02.12.2015]- Найдено в Интернет:<URL:http://dongilmt.gobizkorea.com/ blog/ProductView.do?blogId=sungboent&id=1001928>;. *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU188948U1 (en) * 2018-11-28 2019-04-30 Федеральное государственное бюджетное образовательное учреждение высшего образования "Санкт-Петербургский государственный архитектурно-строительный университет" Screw piled

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Effective date: 20180403