US20100266344A1 - Screw pile - Google Patents

Screw pile Download PDF

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Publication number
US20100266344A1
US20100266344A1 US12/780,156 US78015610A US2010266344A1 US 20100266344 A1 US20100266344 A1 US 20100266344A1 US 78015610 A US78015610 A US 78015610A US 2010266344 A1 US2010266344 A1 US 2010266344A1
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US
United States
Prior art keywords
screw pile
blade
shaft
edge portion
leading edge
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US12/780,156
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English (en)
Inventor
Kym Plotkin
Justin John Williamson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Trista Technology Pty Ltd
Original Assignee
Trista Technology Pty Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from AU2007906259A external-priority patent/AU2007906259A0/en
Application filed by Trista Technology Pty Ltd filed Critical Trista Technology Pty Ltd
Assigned to TRISTA TECHNOLOGY PTY LTD reassignment TRISTA TECHNOLOGY PTY LTD ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: WILLIAMSON, JUSTIN JOHN, PLOTKIN, KYM
Publication of US20100266344A1 publication Critical patent/US20100266344A1/en
Abandoned legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/22—Piles
    • E02D5/56—Screw piles

Definitions

  • the present invention relates to an improved screw pile.
  • Screw piles are used in the construction of buildings and other structures.
  • a typical screw pile comprises a shaft, normally made from mild steel or a higher strength steel.
  • a helical screw or blade is attached to the shaft.
  • the screw pile In order to insert the screw pile into the ground, the screw pile is rotated and pressed downwardly which causes the helical blade to bite into the ground and to screw into the ground.
  • the weight borne by the screw pile is distributed from the helical blade into the earth that lies underneath the helical blade. Further, the earth positioned above the helical blade assists in resisting any lifting forces applied to the screw pile and thereby assists in maintaining the screw pile in the ground.
  • Conventional screw piles comprise a single helical blade.
  • the blade has a leading edge that moves through and breaks the earth as the screw pile is screwed into the ground.
  • Conventional screw piles have a leading edge on their blade that extends generally perpendicularly to the outer periphery of the blade (when viewed from above). As the shaft is normally cylindrical in shape, the leading edge of the blade may be considered to extend outwardly from the shaft in the radial direction.
  • the present invention provides a screw pile comprising a shaft, two blades in the form of opposing flat plates extending outwardly from the shaft, each blade having a leading edge that contacts earth as the screw pile is screwed into the ground, each leading edge including a first straight edge portion extending from the shaft and a second straight edge portion forming an obtuse angle with said first straight edge portion.
  • the present invention provides a screw pile comprising a shaft, two blades in the form of opposing flat plates extending outwardly from the shaft, each blade having a leading edge that contacts earth as the screw pile is screwed into the ground, each leading edge including a first straight edge portion extending from the shaft and a swept back straight edge portion forming an obtuse angle with said first straight edge portion, the swept back straight edge portion being adapted to deflect rocks during insertion of the screw pile into the ground.
  • the present invention provides a blade for a screw pile, the blade having a leading edge that contacts earth as the screw pile is screwed into the ground, the leading edge including a first straight edge portion for extending from a shaft of the screw pile and a second straight edge portion forming an obtuse angle with said first straight edge portion.
  • a third straight edge portion forms an acute angle with the second straight edge portion
  • the screw pile of the present invention may comprise two blades in the form of angled plates.
  • the angled plates may be mounted to the shaft.
  • the angled plates may be mounted to the shaft, for example, by welding.
  • the angled plates may be integrally formed with the shaft.
  • the angled plates may be generally flat angled plates.
  • the angled plates may have opposite pitch to each other. For example, when viewed from side on, one angled plate may extend downwardly from left to right while the other angled plate may extend downwardly from right to left.
  • the two blades are in the form of helical blades.
  • the blades are positioned on opposite sides of the shaft. As most shafts used in screw piles are cylindrical, the blades may be positioned on diametrically opposite sides of the shaft.
  • the lowermost edge of the blades or the angled plates is suitably positioned above a lowermost part of the shaft.
  • the shaft extends below the blades and the lower end of the shaft contacts the ground before the blades contact the ground.
  • the lower end of the shaft may be fitted with or formed with an attack bit.
  • the attack bit engages with the ground when the screw pile is being screwed into the ground and this acts to stabilise the screw pile as it is being screwed into the ground.
  • the attack bit may take the form of two diametrically opposed points formed on the lower end of the shaft.
  • the leading edge of the blades may include a portion that extends at an angle to a perpendicular line extending from the shaft (when viewed from above).
  • the leading edge of the blades may comprise two or more discrete portions extending at different angles to each other.
  • the leading edge may have an innermost portion that is adjacent to the shaft that extends in a direction that is generally perpendicular to the shaft.
  • a second portion may extend from the first portion, with the second portion extending at an angle to the first portion.
  • the second portion is desirably a swept back portion.
  • the leading edge may also comprise further portions.
  • the leading edge may comprise a third portion extending at an angle to the second portion and, in some embodiments, even a fourth portion extending an angle to the third portion. Desirably, the third portion sweeps back from the second portion and the fourth portion sweeps back from the third portion.
  • the portions of the leading edge may be generally straight edge portions.
  • the leading edge may smoothly sweep back from the innermost portion thereof located adjacent to the shaft.
  • the leading edge may take the form of a curved leading edge that progressively sweeps back as it extends away from the shaft.
  • the leading edge of the blades of the screw pile in accordance with the present invention has at least one portion that sweeps back from the direction of rotation of the blade during insertion of the screw pile into the ground.
  • the at least one portion that sweeps back from the direction of rotation of the blade assists in deflecting any rocks that may be encountered during insertion of the screw pile into the ground. In this way, impact loads on the leading edge of the blade during insertion of the blade into the ground are lowered.
  • the rear part of the blades may comprise a generally square or rectangular part.
  • the trailing edge of the blades may include a portion that extends at an angle to a perpendicular line extending from the shaft (when viewed from above).
  • the trailing edge may include a first portion and a second portion extending at an angle to the first portion.
  • the trailing edge may smoothly sweep back towards the shaft.
  • the trailing edge also sweeps back towards the shaft. This also assists in deflecting rocks or other hard material away from the trailing edge of the blades during insertion of the screw pile into the ground. Further, the swept back trailing edge forms a “widened opening” between the blades, thereby reducing the tendency for rocks or other hard material to become jammed between the blades.
  • the tailing edge may mirror the shape of the leading edge.
  • the screw pile in accordance with the present invention in having two blades, also provides for greater stability during the insertion phase of the screw pile into the ground.
  • each blade engages with the ground as the screw pile is being screwed in. Therefore, the forces applied to each blade by engagement with the ground tend to cancel out with each other to thereby result in a more even distribution of forces on the screw pile during insertion.
  • the load bearing capacity of the installed screw pile in accordance with the present invention should be enhanced when compared with the load bearing capacity of conventional screw piles having a single helical blade.
  • resistance to lifting forces applied to the installed screw pile should be enhanced when compared to conventional screw piles having a single helical blade.
  • the behaviour of the screw pile under both compression and tension may be further enhanced in embodiments where the rear part of the blades comprises a generally square or rectangular part.
  • the blades are made from generally flat plates
  • fabrication of the screw pile may be greatly simplified.
  • elliptical cutouts or recesses may be formed in the blade, with the shape of the elliptical cutout or recess following the shape of the outer periphery of the shaft along the angle at which the blade is to be mounted to the shaft.
  • the blade may then be simply cut or stamped and subsequently welded to the shaft. This is a simpler fabrication route than with conventional single helical bladed screw piles, which typically involve forming a semi-circular plate and shaping that plate into a helical flight for subsequent attachment to the shaft.
  • the leading edge may be formed to the desired shape by stamping or cutting the leading edge.
  • the shape and/or size of the blades may vary in accordance with the proposed use of the screw pile.
  • a wide blade may be used for screw piles intended to be used in sandy soils or easily friable soils.
  • a wide blade is appropriate because the screw pile can be easily screwed into the sandy or friable soil.
  • the wide blade assist in spreading compression and tension loads applied to the screw pile into the soil around the screw pile.
  • a less wide blade may be used.
  • Even less wide blades may be used to facilitate penetration of the blade through the earth during installation.
  • the blades used on the screw piles may have further swept back portions to enhance the deflection of rocks during installation.
  • the thickness of the blade may also be increased if the screw pile is to be used in sites that require greater force for installation.
  • the leading edge of the blade may be bevelled or sharpened in order to enhance penetration of the leading edge through the earth as the screw pile is screwed into the ground and to enhance the ability of the blade to deflect rocks or other hard material.
  • FIG. 1 shows a perspective view of a screw pile in accordance with one embodiment of the present invention
  • FIG. 2 shows a plan view of the screw pile shown in FIG. 1 , but only showing one blade for clarity purposes;
  • FIG. 3 is a plan view of the screw pile as shown in FIG. 1 ;
  • FIG. 4 is an underneath view of the screw pile shown in FIG. 1 ;
  • FIG. 5 is a perspective view of a screw pile in accordance with another embodiment of the present invention.
  • FIG. 6 shows a plan view of the screw pile shown in FIG. 5 , but only showing one blade for clarity purposes;
  • FIG. 7 is a plan view of the screw pile as shown in FIG. 5 ;
  • FIG. 8 is an underneath view of the screw pile shown in FIG. 5 ;
  • FIG. 9 is a perspective view of a screw pile in accordance with another embodiment of the present invention.
  • FIG. 10 is a side view of one of the blades used in the screw pile shown in FIG. 9 ;
  • FIG. 11 shows a plan view of the screw pile shown in FIG. 9 , but only showing one blade for clarity purposes;
  • FIG. 12 is a plan view of the screw pile as shown in FIG. 9 ;
  • FIG. 13 is an underneath view of the screw pile shown in FIG. 5 ;
  • FIG. 14 shows a plan view of a screw pile in accordance with a further embodiment of the present invention.
  • FIG. 15 is a view of a plate that has been cut to shape for use as a blade on a screw pile in accordance with an embodiment of the present invention.
  • FIG. 16 is a plan view of a blade for a screw pile in accordance with another embodiment of the present invention.
  • FIGS. 1 to 4 show various views of a screw pile in accordance with an embodiment of the present invention.
  • the screw pile shown in FIGS. 1 to 4 is designed for use in sandy soils or other soils that are easily friable.
  • the screw pile 10 shown in FIGS. 1 to 4 comprises a shaft 12 .
  • Shaft 12 is a generally cylindrical shaft that may be made from mild steel or a higher strength steel.
  • the shaft 12 may be a hollow shaft.
  • the shaft 12 has an upper end 14 and a lower end 16 .
  • Two driving lugs 18 , 20 are attached to the shaft near the upper end 16 .
  • the driving lugs 18 , 20 engage with a driving mechanism to facilitate screwing of the screw pile 10 into the ground.
  • the screw pile 10 also includes two blades 22 , 24 . As best shown in FIG. 1 , the blades 22 , 24 mounted to the outer periphery of the shaft 12 , with each blade being mounted at opposed angles to the longitudinal axis of the shaft 12 . Each of the blades 22 , 24 comprises a flat plate.
  • the lower end 16 of the shaft includes an attack bit formed by points 26 , 28 .
  • the attack bit contacts the ground before any other part of the screw pile.
  • the attack bit bites into the ground and assists in maintaining the screw pile in the desired location of installation.
  • the blades 22 , 24 of the screw pile 10 then engage with the ground and also dig into the ground. This causes the screw pile 10 to screw into the ground. Rotation of the screw pile 10 continues until the screw pile has been screwed to the desired depth.
  • FIG. 2 shows a plan view of the shaft 12 and the blade 24 .
  • the blade 24 has a leading edge, generally indicated by reference numeral 30 .
  • the direction of rotation of the blade 24 is shown by the arrow in FIG. 2 .
  • the leading edge 30 is the part of the blade 24 that contacts the earth as the blade 24 is rotated during insertion of the screw pile 10 into the ground. Therefore, the leading edge 30 engages with and breaks the earth as the screw pile is screwed into the ground.
  • the leading edge 30 includes a first portion 32 , a second portion 34 and a third portion 36 .
  • First portion 32 is located adjacent to the shaft 12 .
  • First portion 32 extends generally perpendicularly to the outer periphery of the shaft 12 .
  • first portion 32 of the leading edge of blade 24 may be considered to extend in the radial direction from the shaft 12 .
  • the second portion 34 of the leading edge 30 sweeps back from the first portion 32 .
  • the third portion 36 sweeps back from second portion 34 .
  • the swept back angle of those portions of the leading edge assist in removing or deflecting the rocks or hard material, thereby facilitating insertion of the screw pile 10 into the ground and minimising the likelihood of damage to the screw pile or to the equipment used to screw in the screw pile.
  • the first portion 32 of the leading edge 30 may be considered to comprise a small and strong initial straight blade attack region.
  • the second portion 34 may be considered to comprise a medium follow-on, swept blade attack region.
  • the third portion 36 may be considered to comprise the largest follow-on, increased sweep blade attack region.
  • rear part 38 of blade 24 is of generally square or rectangular shape.
  • the other blade 22 of screw pile 10 has a generally similar arrangement at its leading edge and rear part.
  • FIGS. 5 to 8 show another embodiment of a screw pile 50 in accordance with the present invention.
  • the embodiment shown in FIGS. 5 to 8 is very similar to the screw pile 10 shown in FIGS. 1 to 4 .
  • similar features will be referred to using similar reference numerals, but with the attachment of a ′. These features need not be described further.
  • the screw pile 50 shown in FIGS. 5 to 8 is designed primarily for use in clay soils.
  • the screw pile 50 as shown in FIGS. 5 to 8 differs from the screw pile 10 as shown in FIGS. 1 to 4 in that the width of the blades is less.
  • the blade 24 ′ shown in FIGS. 5 to 8 has a width W that is less than the width W of the blade 24 shown in FIGS. 1 to 4 .
  • the reason for this is that the screw pile 10 is designed for use in sandy soil sites. As these soils are easily broken, the additional width of blade 24 does not cause difficulties in screwing the screw pile 10 into the soil. Further, the additional width of blade 24 (and the corresponding blade 22 that is also mounted to the shaft 12 ) assists in spreading the load from the screw pile into the friable soil. In contrast, the narrower blade 24 ′ shown in FIGS.
  • FIGS. 9 to 13 shown various views of a screw pile 60 in accordance with another embodiment of the present invention.
  • the screw pile 60 has a number of features in common with the screw pile 10 as shown in FIG. 1 and, for convenience, those similar features are denoted by a similar reference numeral is but with the addition of a ′′. These features need not be described any further.
  • the screw pile 60 is intended for use in rocky soils. Accordingly, compared to screw piles 10 and 50 , as shown in FIGS. 1 to 8 , the screw pile 60 has blades of lesser width.
  • the blades 22 ′′ and 24 ′′ are also thicker than the blades 22 , 24 and 22 ′, 24 ′.
  • the blade 22 ′′ also has a bevelled leading edge 23 , which assists in breaking or penetrating the ground in advance of the leading edge during screwing in of the pile 60 , as well as enhancing the deflection capabilities of the blades 22 ′′ and 24 ′′.
  • the front part of the blade 24 ′′ includes first portion 32 ′′, second portion 34 ′′, third portion 36 ′′ and fourth portion 37 .
  • the first portion 32 ′′ comprises a small and strongest initial straight blade attack region
  • the second portion 34 ′′ provides a medium follow-on, swept blade attack region
  • the third portion 36 ′′ provides a larger follow-on, increased sweep blade attack region
  • the fourth region 37 provides a trailing edge blade to help final deflection of rocky material.
  • the blade 22 ′′ has a similar leading edge region.
  • the rear part 38 ′′ also has a trailing blade region 39 for load distribution.
  • the trailing blade region 39 may be expediently formed by simply cutting off a corner of the rear part of the blade.
  • the embodiment of the screw pile 60 shown in FIGS. 9 to 13 has the smallest and thickest blade with added cutting and deflection in the blades.
  • This version of the screw pile is designed to penetrate the most difficult soil that contains rocks, debris and cobbles.
  • This version is less reliant on blade load capacity than the versions shown in FIGS. 1 to 8 since it is designed to chase and engage bedrock.
  • FIG. 14 shows a plan view of a screw pile in accordance with a further embodiment of the present invention.
  • the screw pile 100 shown in FIG. 14 has a shaft 102 and two blades, designated in FIG. 14 as Blade A and Blade B.
  • Blade A has a leading edge 104 that includes first attack edge portion 106 , second attack edge portion 108 and third attack edge portion 110 .
  • blade B has a leading edge 112 that includes first attack edge portion 114 , second attack edge portion 116 and third attack edge portion 118 .
  • Blade A has a trailing edge 120 having edge portion 122 and swept back edge portion 124 .
  • the trailing edge 120 joins to the shaft 102 via a perpendicular portion that is located adjacent to edge portion 114 of leading edge 112 of Blade B, in the view shown in FIG. 14 .
  • Blade B has a trailing edge 130 having edge portion 132 and swept back edge portion 134 .
  • the trailing edge 130 joins to the shaft 102 via a perpendicular portion that is located adjacent to edge portion 106 of leading edge 104 of Blade A, in the view shown in FIG. 14 . It will be appreciated that the trailing edge of one blade is at a different vertical height to the leading edge of the other blade.
  • each blade mirrors the leading edge of the other blade to create a “wide and opening between the blades to prevent rocks and to debris jamming therebetween.
  • These white and openings are shown by reference numerals 140 and 142 .
  • the swept trailing blade edges also aid in deflecting any rocks or debris that attempt to jam between the blades.
  • FIG. 15 shows a steel plate 150 that has been cut to a shape that is suitable for use as a blade on a screw pile in accordance with the embodiment of the present invention shown in FIG. 14 .
  • the plate 150 is made from 8 mm thick, 350 grade steel, although it will be appreciated that the plate may be made from different grades and/or thickness of steel or indeed it may be made from other alloys or materials.
  • the plate 150 has leading edge portions 152 , 154 and 156 , and trailing edge portions 158 , 160 and 162 .
  • the plate has a side edge 164 .
  • a half oval cut 166 is made to allow the blade to closely conform to the outer periphery of the shaft of the screw pile, it being appreciated that the plate is mounted to the shaft at an angle to the horizontal (thereby necessitating a half oval cut).
  • the trailing edge is a mirror of the leading edge.
  • a screw pile blade 200 as shown in FIG. 16 .
  • the blade 200 has a leading edge 202 that contacts earth as the screw pile is screwed into the ground.
  • the leading edge 202 includes a first straight edge 204 portion for radially extending from a shaft of the screw pile, and a second straight edge portion 206 forming an obtuse angle 207 with said first straight edge portion 204 .
  • a third straight edge portion 208 forms an acute angle 209 with the second straight edge portion 206 .
  • the trailing edge 210 mirrors the leading edge 202 .
  • the blade 200 is effective in working clay and cobbled soils.
  • Screw piles in accordance with embodiments of the present invention provide robust screw piles having enhanced installation capabilities.
  • the use of twin blades evens out the forces that are applied to the blade during installation of the blade into the ground. Further, loads borne by the screw pile are evenly distributed through the twin blades into the ground.
  • the blades are easily made by cutting or stamping and the blades can be very simply joined to the shaft of the screw pile by welding.
  • Some embodiments of the screw pile include attack points or an attack bit on the end of the shaft, which also assists in keeping the pile aligned during installation and minimises oscillation of the screw pile during installation.
  • the present invention may be susceptible to variations and modifications other than those specifically described.
  • One possible variation of the screw pile may involve the addition of a further set of twin blades above and spaced from the lower twin blades that are shown in FIGS. 1 to 13 . These further twin blades are suitably mounted in similar fashion to the shaft of the screw pile.
  • the earth that is present between the lower set of twin blades and the upper set of twin blades is trapped between the two sets of blades.
  • the screw piles in accordance with that embodiment act in a fashion that is similar to friction piles.
  • the flat plate twin blades as shown in FIGS. 1 to 13 , may be replaced by helical twin blades or twin helical flights.

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  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Paleontology (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Piles And Underground Anchors (AREA)
US12/780,156 2007-11-15 2010-05-14 Screw pile Abandoned US20100266344A1 (en)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
AU2007906259A AU2007906259A0 (en) 2007-11-15 Improved Screw Pile
AU2007906720A AU2007906720A0 (en) 2007-12-11 Improved Screw Pile
AUAU2007906720 2007-12-11
AUPCT/AU2008/001668 2008-11-11
PCT/AU2008/001668 WO2009062231A1 (en) 2007-11-15 2008-11-11 Improved screw pile
AUAU2007906259 2009-11-15

Publications (1)

Publication Number Publication Date
US20100266344A1 true US20100266344A1 (en) 2010-10-21

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Family Applications (1)

Application Number Title Priority Date Filing Date
US12/780,156 Abandoned US20100266344A1 (en) 2007-11-15 2010-05-14 Screw pile

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US (1) US20100266344A1 (xx)
CN (1) CN101910521A (xx)
NZ (1) NZ585477A (xx)
WO (1) WO2009062231A1 (xx)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2018044400A (ja) * 2016-09-16 2018-03-22 株式会社シグマベース 鋼管杭
US9957684B2 (en) 2015-12-11 2018-05-01 American Piledriving Equipment, Inc. Systems and methods for installing pile structures in permafrost
US10385531B2 (en) 2015-10-09 2019-08-20 American Piledriving Equipment, Inc. Split flight pile systems and methods
US10392871B2 (en) 2015-11-18 2019-08-27 American Piledriving Equipment, Inc. Earth boring systems and methods with integral debris removal
US10760602B2 (en) 2015-06-08 2020-09-01 American Piledriving Equipment, Inc. Systems and methods for connecting a structural member to a pile
US20210254297A1 (en) * 2017-05-31 2021-08-19 Allentown Infrastructure Group, Llc Open End Friction Pile
US11949370B2 (en) 2020-09-14 2024-04-02 Nextracker Llc Support frames for solar trackers

Citations (6)

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US4756129A (en) * 1982-12-21 1988-07-12 Webb Brian C Ground anchor and apparatus to set and remove same
US5067571A (en) * 1988-04-07 1991-11-26 Power Planter, Inc. Auger planter
US5113952A (en) * 1988-04-07 1992-05-19 Power Planter, Inc. Auger planter method
US20040105727A1 (en) * 2002-12-03 2004-06-03 Jones Robert L. Piering device with adjustable helical plate
US20050074298A1 (en) * 2003-10-06 2005-04-07 Jones Robert L. Modular tubular helical piering system
US7018139B1 (en) * 2005-05-23 2006-03-28 Cantsink, Inc. Structural helical pile

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JPH11140871A (ja) * 1997-11-10 1999-05-25 Nkk Corp 翼付きねじ込み式鋼管杭
JP4267489B2 (ja) * 2004-03-12 2009-05-27 株式会社三誠 翼付き鋼管杭
JP2005315050A (ja) * 2004-03-30 2005-11-10 Masahiro Sugano 回転埋設杭
JP2006265951A (ja) * 2005-03-24 2006-10-05 Fukushima Pulse Kk 拡底支持板付き回転埋設杭
JP2006312825A (ja) * 2005-05-09 2006-11-16 Sumitomo Metal Ind Ltd 回転貫入杭およびその施工方法

Patent Citations (6)

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Publication number Priority date Publication date Assignee Title
US4756129A (en) * 1982-12-21 1988-07-12 Webb Brian C Ground anchor and apparatus to set and remove same
US5067571A (en) * 1988-04-07 1991-11-26 Power Planter, Inc. Auger planter
US5113952A (en) * 1988-04-07 1992-05-19 Power Planter, Inc. Auger planter method
US20040105727A1 (en) * 2002-12-03 2004-06-03 Jones Robert L. Piering device with adjustable helical plate
US20050074298A1 (en) * 2003-10-06 2005-04-07 Jones Robert L. Modular tubular helical piering system
US7018139B1 (en) * 2005-05-23 2006-03-28 Cantsink, Inc. Structural helical pile

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10760602B2 (en) 2015-06-08 2020-09-01 American Piledriving Equipment, Inc. Systems and methods for connecting a structural member to a pile
US10385531B2 (en) 2015-10-09 2019-08-20 American Piledriving Equipment, Inc. Split flight pile systems and methods
US10392871B2 (en) 2015-11-18 2019-08-27 American Piledriving Equipment, Inc. Earth boring systems and methods with integral debris removal
US9957684B2 (en) 2015-12-11 2018-05-01 American Piledriving Equipment, Inc. Systems and methods for installing pile structures in permafrost
JP2018044400A (ja) * 2016-09-16 2018-03-22 株式会社シグマベース 鋼管杭
US20210254297A1 (en) * 2017-05-31 2021-08-19 Allentown Infrastructure Group, Llc Open End Friction Pile
US11949370B2 (en) 2020-09-14 2024-04-02 Nextracker Llc Support frames for solar trackers

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NZ585477A (en) 2013-03-28
CN101910521A (zh) 2010-12-08
WO2009062231A1 (en) 2009-05-22

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