CA2394894A1 - Tubular pipe helix blade system - Google Patents
Tubular pipe helix blade system Download PDFInfo
- Publication number
- CA2394894A1 CA2394894A1 CA002394894A CA2394894A CA2394894A1 CA 2394894 A1 CA2394894 A1 CA 2394894A1 CA 002394894 A CA002394894 A CA 002394894A CA 2394894 A CA2394894 A CA 2394894A CA 2394894 A1 CA2394894 A1 CA 2394894A1
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- CA
- Canada
- Prior art keywords
- sleeve
- shaft
- pipe
- helix blade
- collar
- 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
Links
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 238000009434 installation Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- 230000008569 process Effects 0.000 description 2
- 230000004913 activation Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 239000011440 grout Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000009424 underpinning Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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
-
- 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
- E02D5/24—Prefabricated piles
- E02D5/28—Prefabricated piles made of steel or other metals
- E02D5/285—Prefabricated piles made of steel or other metals tubular, e.g. prefabricated from sheet pile elements
-
- 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
- E02D5/52—Piles composed of separable parts, e.g. telescopic tubes ; Piles composed of segments
- E02D5/523—Piles composed of separable parts, e.g. telescopic tubes ; Piles composed of segments composed of segments
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2200/00—Geometrical or physical properties
- E02D2200/16—Shapes
- E02D2200/1671—Shapes helical or spiral
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/10—Deep foundations
- E02D27/12—Pile foundations
- E02D27/14—Pile framings, i.e. piles assembled to form the substructure
Abstract
A tubular pipe helix system (10) includes a coupler (16) which has a sleeve (60 or 70) which is affixed internally or externally of, and in overlapping relationship with, an end (36) of one shaft (12) to create an enhanced wall thickness (W3) thereat and which is to be received in a collar (52) affixed to one end (40) of another shaft (14), with the two shafts able to be connected together by a single bolt (50) extending through the sleeve (60 or 70), the end (36) of the shaft (12), and collar (52) so as to transmit high torque without the need for multiple bolts.
Description
r -l TUBULAR PIPE HELI3~ BLADE SI'STEi\Z
Back;round of the Invention I. Field of tie Invention The present invention relates to helix blade systems, and more particularly to helix blade systems which use tubular pipes or shafts.
II. Description of Prior Art Helix blade systems are well known to provide support for foundations, pierin~ to lift sunken foundations. or to tie back walls or provide other mounting supports, by wav of example. Such systems include an elon4ated shaft in the form of a solid rod or a hollow pipe to which are mounted one or more helix blades. The proximal or trailing end of the shaft is caused to rotate, such as by application of torque from the shaft of a torque motor driver attached thereto, so as to rotate the helix blades) into the ground. Examples of helix blade systems are shown in my U.S. Patent No.
6,0i8,662, and in U.S. Patent Nos. s,i71,107; 3.999.391; and 3.810,30 to name a few.
In some cases, the blades) are to be driven into the ground to a depth that is deeper than the length of the shaft supponin~ the blade(s). In that case, a second or extension shaft i may be attached at its distal or leading end to the trailing end of the preceding shaft, such as with a socket or collar mounted to the end of one of the shafts and receiving the adjacent end of the other shaft therein. Torque is then applied to the trailing end of the second shaft to thereby rotate the blade deeper into the ?round. Successive extension shafts may be so applied.
Tyical of solid shafts is one inch square. However, the solid shafts have a tendency to twist and so can not withstand the hi?h torques desired to be applied to drive the helix blade system. Tubular pipes, such as cylindrical pipes, are believed to be better able to withstand high torque without twisting. The trailing end of the main shaft and the leading end of driver shaft or extension shaft are held together with two or more 1~ bolts extending through bolt holes provided through one of the ends and the collar on the other end, for example. There is a belief chat a plurality of bolts is necessary in order to withstand the high torques to be applied, such as 10,000 ft-Ib, and possibly as high as in the range of 13,000 ft-Ib.
In the field, the use of multiple bolts presents several dra4vbacks. There must be sufficient bolts available on the job site; there are labor and parts costs to deal with; and the complexity of the job is increased. Moreover, where an extension shaft is to be bolted to the preceding shaft, the preceding shaft may have been driven near or well into the ground making access for application of multiple bolts a difficult and tedious task. And should the operator fail to include the required number of bolts, the 3~ system might fail.
Summary of the Invention Typically, the installation procedure for each section of a helix blade system involves attaching the section to the torque motor, rotationall~~
driving the section into the ground, removing the section from the torque motor, attaching the next section, and repeating the process. The attachment to the torque motor is typically the same as the attachment between sections. Hence, each attachment must be made, unmade, and remade for every section. Helix blade systems commonly require four or more sections. Rotational driving into the ~ ound is a comparatively quick process.
Hence, the makin' and unmaking of attachments comprises much of the time required for installation of helix blade systems. The number of bolts required for each section attachment is perhaps the most important factor governing helix blade system installation time.
The axial holding capacity of a helix blade system in the around is directly proportional to the installation torque. Therefore, the torsional strength of a 1~ helix blade system and that of attachments between sections govern the overall performance of the total helix blade system in supponin~ foundation loads, in an underpinning capacity, or in serving as an earth anchor.
Contrary to widely believed misconceptions regarding helix blade system attachments, the number of bolts use in making an attachment is not a significant factor ?0 affecting its torsional strength. The torsional shear strength of a tubular shaft with a liven diameter depends on the rotational moment of inertia which is primarily a function of cross-sectional area. Therefore, increasing the cross-sectional area of an attachment can increase the torsional strength of a helix blade system.
The present invention provides an improved tubular pipe helix blade ?a system which may be attached with only a single bolt, and yet has improved torsional _3_ , strength. To this end, and in accordance with the principles of the present invention, an attachment end of a tubular shaft is provided with a sleeve fitted over (external of) or within (internal of) the shaft at that end so as to provide an enhanced Lvall thickness to the cylindrical wall at the attachment end of the shaft, and thus increased cross-sectional area of the attachment. The sleeve and the attachment end of the shaft are provided with a bolt receiver, such as holes extending transverse to the longitudinal axis of the shaft.
The end of the shaft may be the trailing end of a shaft, adapted to fit into the driver shaft or a collar of the next shaft, or may be at the distal or leading end of a shaft adapted to fit into a collar of the preceding shaft. In either case, the shaft and the sleeve present a coaxial pair of cylindrical pipe sections that have a collective wall thickness greater than the wall thickness of just the shaft end. As a consequence, the shaft end may be attached to the driver shaft or adjacent shaft by only one bolt while able to transmit the high torques expected to be encountered.
Advantageously, the sleeve and shaft end are affixed together. In one 1i embodiment, they may be affixed by piu~ welding. To this end, a hole is formed on the exterior component (the shaft if the sleeve is internal of the shaft, and the sleeve if it is external of the shaft), and the hole is used to create a plug weld thereat to the sleeve or shaft therewithin. There may be more than one hole and plug weld, such as an opposed pair. Other affixation techniques may be used, as will be easily understood by those skilled in the art. Further advantageously, the shaft and the sleeve may be cylindrical and the inner diameter of the shaft end and the outer diameter of the sleeve where the sleeve is internal of the shaft, or the inner diameter of the sleeve and the outer diameter of the shaft end where the sleeve is external of the shaft, are approximately equal so that the fit is snug. 1'et further, the sleeve may extendybeyond the adjacent end of the shaft so as to project therefrom, or may be flush to or behind the end of the shaft, provided that there is a length of sleeve above and below the bolt receiver holes formed therein.
In accordance with a yet further aspect of the present invention, the wall thickness of the shaft and the wall thickness of the sleeve are approximately the same.
As a consequence, there is provided at the attachment end of the shaft a double wall thickness.
With the improved helix blade system of the present invention, the shaft end may be attached to the driver shaft or adjacent shaft by only one bolt while able to transmit the high torques expected to be encountered. By virtue of the foreaoin~, there is thus provided an improved tubular pipe helix blade system which may be attached by a single bolt, and yet has improved torsional strength. These and other objects and advantages of the present invention shall be made apparent from the accompanying drawings and the description thereof.
Brief Description of the Drawings 1~ The accompanying drawings, which are incorporated in and constitute a part of this specification 'illustrate embodiments of the invention and, together with a general description of the invention given above, and the detailed description of the embodiments liven below, serve to explain the principles of the invention.
Fig. 1 is a perspective view of an exemplary helix blade system for 30 proposes of explaining the principles of the present invention;
Fia. ? is a cross-sectional view of one embodiment of the trailing end of the lower shaft of the helix blade system of Fig. 1 showing a sleeve internal of the shaft in accordance with the principles of the present invention:
Fio. 3 is a view taken along line s-3 of Fib. ?;
_5_ Fig. 4 is a cross-sectional view of the one embodiment of the ieadin~ end of the upper shaft of the helix blade system of Fig. 1 showing a collar for receiving the trailing end embodiment of Fig. 2:
Fig. a is a cross-sectional view of another embodiment of the trailing end of the lower shaft of the helix blade system of Fig. I showing a sleeve external of the shaft in accordance with the principles of the present invention;
Fig. 6 is a view taken along line 6-6 of Fig. ~;
Fig. 7 is a cross-sectional view of another embodiment of the leading end of the upper shaft of the helix blade system of Fig. 1 showing a collar for receiving the trailing end embodiment of Fig. 5;
Fig. $ is a schematic view of a torque motor drive with an upper shaft from Fig. 1;
Fig. 9 is a perspective view of one embodiment of an extension shaft having the sleeve and collar embodiments of Fibs. ?-4;
1~ Fig. 10 is a perspective view of another embodiment of an extension y shaft having the sleeve and cdllar embodiments of Fies. 5-7; and Fig. 1 I is a perspective view of a building structure supported by a plurality of helix blade systems of Fig. 1 for purposes of explaining use of the present mvennon.
Detailed Description of the Drawings ~~~ith reference to Fig. I there is shown a tubular pipe helix blade system 10 comprised of a lower shaft 1? and an upper shaft 14 joined together as at coupler 16 as will be described hereinafter. Shaft 1? may be in the form of a cylindrical steel pipe with a helix blade 30 mounted thereto. One or more additional helix blades) ?
I (only one shown) may also be maunted to pipe 13 spaced from blade 20 as will be readily -6- , appreciated by those skilled in the art. Blades 20 and 31 (if provided) may be conventional helix blades, or may be as shown in my aforementioned U.S. Patent No.
6,068,662. In the embodiment shown herein, each blade 30, ? 1 has a dual cutting edge provided by forming one half 3? of the blade to a first radius which may be lamer for 6 blade 31 than for blade 20. The other, opposite half 23 is formed to a second radius which may also be larger far blade 21 than blade 20, but which is less than the first radius of the associated blade. The smaller radius portion 23 of each blade is advantageously displaced below the larger radius portion along shaft 12. The leading cutting edges 24, 26 on the blades may be beveled to facilitate cutting in of the blade into the ground 200 (Fig. 11) as will be described hereinafter. The distal or leading end 30 of shaft 12 may be formed to enhance cutting into ?round 200. To this end, a beveled edge 32 may be formed at end 30 as shown in Fig. 1, or a point (not shown) may be formed along the longitudinal axis 34 of shaft 1? such as by a solid end segment (not shown) attached to end 30. Other configurations for end 30 may be utilized as 16 desired. The edge 36 (Figs. '? and ~) of proximal or trailing end 36 of pipe 1? is generally perpendicular to longitudinal axis 34 of pipe 1?, and end 36 is to be coupled to shaft 14 as at 16 as will be hereinafter described.
Upper shaft 14 is also formed by a cylindrical steel pipe having at least a distal or leading end 40 to couple to pipe 12. The edee 41 of leading end 40 is also advantageously perpendicular to longitudinal axis 34 thereof. Although the dimensions need not be the same, for purposes of describing the invention, common diameters will be used for pipes 1? and 14 to simplify the discussion. To this end, pipes 1?
and 14 each have a cylindrical sidewall 49 (see Figs. ?-7) defining a wall thickness VJ 1 between the inner diameter D1 and outer diameter D? thereof. Typically, the wall thickness ~T~'1 is about 1/8 inch or about 1/4 inch, with an outer diameter D2 of about 3 inches.
In accordance with the principles of the present invention, it is desired to couple the end 36 of shaft 12 to the end 40 of shaft 14 advantageously using one bolt ~0, such as a Grade ~ bolt or better, with improved torsional strength by providing a greater cross-sectional area so as to obtain torque strength such as 10,000 ft.tb, and possibly in the neighborhood of 13,000 ft. 1b. To this end, the coupling 16 occurs at the attachment ends 36 and/or 40 of pipes 12 and 14 by providing one of those ends 36 or 40 with a tubular, such as cylindrical, steel collar ~? and the other of those ends 36 or 40 with an enhanced wall thic-ness by addition of a tubular, such as cylindrical, steel sleeve 60 (internal) or 70 (external) as will be described with reference to Figs. 3-4 and 5-7, respectively. For sake of simplicity, collar ~? will be described as attached to end 40 of pipe 14, with sleeve 60 or 70 being mounted or affixed along the end 36 of pipe 12, although it will be appreciated that the collar could be on end 36 and the sleeve along end 40.
Looping first at the internal sleeve 60, with reference to Fias. 2 and 3, 1~ sleeve 60 has a sidewall 62 of predetermined thickness W2 as defined between its inner diameter D3 and its outer diameter D4. The outer diameter D4 of sleeve 60 is approximately equal to or slightly Less than inner diameter D1 of pipe 12 so as to fit internal of pipe 12 at end 36, and advantageously snugly therein. Sleeve 60 is affixed to pipe 1? so as to extend along and into end 36 thereof and in overlapping or coaxial relationship therewith. Sleeve 60 may also extend outwardly therefrom or may be recessed therefrom (both not shown), although in the embodiment shown, sleeve ends at edge 61 generaily flush with edge 35 of pipe 12. One or more one inch diameter apertures 64 (Fib. 3) are formed about 3 3I4 inches from the edge 3, in sidewall 49 of pipe 12 adjacent sleeve 60 so as to expose sidewall 62 thereof through the apertures 64.
A plug weld 66 is formed to fill flush each aperture 64 to secure sleeve 60 to pipe 13 with a 70 KSI minimum ~rield weld.
Ali?ned one inch diameter bolt holes 65 are provided ihrou~h the sidewalls 49 and 6? about two inches from the edges 35 and 61 and at 90' to welds 66 (if an oppositely disposed pair is provided as shown) to receive therethrouoh a Grade ~
(or better) bolt ~0 (Fig. 1). Bolt ~0 thus interacts with the bolt holes 65 of both sleeve 60 and pipe 1?, for example. Collar ~? for use with the embodiment of Figs. 2 and 3 has an inner diameter D7 approximately equal to or slightly lamer than the outer diameter D2 of pipe 12 so as to removably receive therein pipe end 36 with sleeve 60.
One inch diameter bolt holes 67 are provided in collar wall 68, about two inches from edge 69, to also receive bolt ~0 and secure pipe end 36 to pipe end 40.
With sleeve 60 internal of pipe 12, there is provided a coaxial pair of pipe sections 36, 60 with a collective wall thickness W3 greater than wall thickness W1.
Advantageously, wall thickness W2 of sleeve 60 is approximately equal to wall 1~ thickness Wl so as to provide at end 36 a double wall thickness of pipe for joining to pipe 14. The collective Hall thickness W3 is believed to provide the ability to withstand the transfer of torque between shafts 12 and 14 at the high levels of torque expected to be encountered while advantageously using one bolt ~0 to couple shafts 1? and together, thereby eliminating the need for, and drawbacks associated with use of, multiple bolts to couple the shafts together.
With reference to Figs. i and 6, the enhanced wall thickness W3 may also be achieved by placing sleeve 70 external of shaft 12, rather than placing sleeve 60 internal thereof. To this end. sleeve 70 has a sidewall 7? of predetermined thickness W4 as defined between its inner diameter D~ and its outer diameter D6. The inner diameter D~ of sleeve 70 is approximately equal to or slightly larger than outer diameter D2 of pipe 13 so as to fit external of pipe 12 at end 36,.and advantageously snugly therealong. Sleeve 70 is affixed to pipe 12 so as to extend along end 36 thereof in overlapping or coaxial relationship, and may also extend outwardly therefrom or be recessed therefrom (both not shown), although in the embodiment shown, the edge 71 of sleeve 70 ends flush with edge 35 at end 36 of pipe 12. One or more one inch apertures 74 are formed in sidewall 72 of sleeve 70 below edge 71 and adjacent pipe end 36 so as to expose sidewall 49 thereof through the apertures 74. A plug weld 66 is fotTrted to fill flush in each aperture 74 to secure sleeve 70 to pipe 1?.
As with the embodiment of Figs. ? and 3, aligned bolt holes 6~ are provided through the sidewalk 72 and 49 to receive therethroujh a number ~ (or better) bolt 30. With reference to Fig. 7, collar S2 to be used with the embodiment of Figs. S
and 6 has an inner diameter D8 approximately equal to or slightly larjer than the outer diameter D~ of sleeve 70 (and therefore much larger than diameter D2 of pipe 12) so as to removably receive therein sleeve 70 with pipe end 36. As above, bolt holes 67 are 1~ provided in collar wall 68 to also receive bolt ~0 and secure pipe end 36 to pipe end 40.
V~'ith sleeve 70 external of pipe 13, there is provided a coaxial pair of pipe sections 36, 70 with a collective wall thickness W3 greater than wall thickness W 1.
Advantageously, wall thickness W4 of sleeve 70 is approximately equal to wall thickness W1 so as to provide at end 36 a double wall thickness of pipe for joining to ?0 pipe 14. The collective wall thickness W3 is believed to provide the ability to withstand the transfer of torque between shafts 1? and 14 at the high levels of torque expected to be encountered while using only one bolt 6~ to couple shafts 1? and 14 together, thereby eliminating the need for, and drawbacks associated with use of, multiple bolts to couple the shafts toeether.
-lU-Pipe 14 may be the shaft.of a torque motor driver 100 as shown in Fig. 8.
End 40 may thus be provided with the appropriately sized collar ~2 (as shown in Fig. 8) or sleeve 60, 70 depending upon how end 36 of shaft 12 is configured. When shafts 14 and 13 are bolted together as above-described, activation of driver 100 will impart rotational torque through shaft 14 to shaft 13 to rotate helix blade 30 and, if present, blades) 21.
For extension of shaft 1?, shaft 14 may be an extension shaft 14a or 14b as shown in Fios. 9 and 10, respectively. In those embodiments, when a collar ~2 is mounted to end 40 of pipe 14a or 14b, the other end 80 of pipe 14a or 14b is provided with either an internal or external sleeve 60 (Fig. 9) or 70 (Fig. 10) as above described for attachment to another shaft in succession. Alternatively, where a collar 52 is on pipe 12, end 40 of pipe 14a or 14b includes the sleeve 60 or 70 and the other end 80 of pipe 14a or 14b may be provided with an appropriately sized collar ~?.
In use, and with reference to Fig. 11, a plurality of helix blades 20 (and possibly 21, if present) are to be driven into ground ?00 by rotation applied to ends 36 of pipes 12. Advantageously,'in each system 10, either shaft 13 or shaft 14 (which in the first instance may be pan of driver 100) are provided with the enhanced wall thickness sleeve 60 or 70, and an appropriately sized collar 52, and they are joined together by only one bolt ~0 extendin' through bolt holes 6~ and 67. A nut ~ 1 may be used to secure bolt ~0 in place. Rotation is imparted to shafts 14 by a plurality of drivers 100 to drive respective blades 20 (and 31) into ground 200 such as adjacent a building structure ?10 which is to be supported thereon. If blades 20 are driven far enough into ground 300, then shafts 14 and drivers 100 may be removed and the building placed atop ends 36 for support or pierin~ (such as with brackets ?
13) as is ~i conventional. .Alternatively, one or more shafts 1? with blades 20 may be driven into ground ?00 at a steep an_le (not shown) to provide a tie-back to a foundational wall 314 of building ?10. If blades ?0 are to go deeper into the ground than is possible with the length of pipes 13, which may be 5 or 6 feet long, then a plurality of second shafts, such as extension shafts 14a or 14b, which may be 1, S or 10 feet in length, for example, are to be connected to respective shafts 12 as above described, each with only one bolt ~0.
Torque is then applied to the respective ends 80 of shafts 14a or 14b which transmit the torque to shafts 12 to rotate blades 20 further into ground 200 as desired.
Further extension shafts 14a or 14b may be applied in succession as will be readily apparent to those skilled in the art. The building 210 may be supported on the extension assembly of shafts 12 and extension shafts 14a or 14b, for example.
Pipes 12, 14, sleeves 60, 70, and collar 52 may be ASTM A-~ 13 101/1020 @ 70 KSI Ultimate Tensile/Compression steel. Sleeves 60, 70 advantageously have a wall thickness W2, W4 of about 1/4 inch, and are advantageously about six inches long. The outer diameter D4 of sleeve 60 is 1~ advantageously about 2 1/2 inches. The wall 68 of collar ~2 for use with the sleeve 60 embodiment of Fijs. 2 and 3 has a thickness about 1/4 inch thick, and has a length of about five inches, and an outer diameter of about 1 p/8 inch. Advantageously, collar ~3 is slid over shaft end 40 (or 36) to about 7/8 inch from the end and welded full circumference thereto as at 2;0.
By virtue of the foregoing, there is thus provided an improved helix blade system which may attach with a single bolt, and yet has improved torsional strength.
While the present invention has been illustrated by the description of embodiments thereof and specific examples, and while the embodiments have been described in considerable detail, it is not intended to restrict or in any way limit the _I~_ , scope of the appended claims to such detail. Additional advantages and modifications will readily appear to those spilled in the art. For example, although only one bolt hole set is shown at 16, multiple bolt hole sets may be provided for various purposes, including longitudinal offset of the pipes and/or use of multiple bolts, if desired.
Further, while the term collar is used, it will be appreciated that the term is meant to include receiver, socket or other such structure intended to receive therein the coaxial pair of the attachment end and the sleeve of another shaft of the helix blade system.
Still further, while cylindrical pipe shafts or sections are shown, it will be appreciated that tubular pipes or other cross-sections may be used, such as square or hexagonal tubes. Moreover, the interior of the pipe may be filled with material such as grout, glue or concrete, as will be readily appreciated by those skilled in the art. The invention in its broader aspects is, therefore, not limited to the specific details, representative apparatus and method, and illustrative examples shown and described.
Accordingly, departures may be made from such details without departing from the spirit or scope of 1~ the general inventive concept.
Having described the invention, what is claimed is:
-13- ,
Back;round of the Invention I. Field of tie Invention The present invention relates to helix blade systems, and more particularly to helix blade systems which use tubular pipes or shafts.
II. Description of Prior Art Helix blade systems are well known to provide support for foundations, pierin~ to lift sunken foundations. or to tie back walls or provide other mounting supports, by wav of example. Such systems include an elon4ated shaft in the form of a solid rod or a hollow pipe to which are mounted one or more helix blades. The proximal or trailing end of the shaft is caused to rotate, such as by application of torque from the shaft of a torque motor driver attached thereto, so as to rotate the helix blades) into the ground. Examples of helix blade systems are shown in my U.S. Patent No.
6,0i8,662, and in U.S. Patent Nos. s,i71,107; 3.999.391; and 3.810,30 to name a few.
In some cases, the blades) are to be driven into the ground to a depth that is deeper than the length of the shaft supponin~ the blade(s). In that case, a second or extension shaft i may be attached at its distal or leading end to the trailing end of the preceding shaft, such as with a socket or collar mounted to the end of one of the shafts and receiving the adjacent end of the other shaft therein. Torque is then applied to the trailing end of the second shaft to thereby rotate the blade deeper into the ?round. Successive extension shafts may be so applied.
Tyical of solid shafts is one inch square. However, the solid shafts have a tendency to twist and so can not withstand the hi?h torques desired to be applied to drive the helix blade system. Tubular pipes, such as cylindrical pipes, are believed to be better able to withstand high torque without twisting. The trailing end of the main shaft and the leading end of driver shaft or extension shaft are held together with two or more 1~ bolts extending through bolt holes provided through one of the ends and the collar on the other end, for example. There is a belief chat a plurality of bolts is necessary in order to withstand the high torques to be applied, such as 10,000 ft-Ib, and possibly as high as in the range of 13,000 ft-Ib.
In the field, the use of multiple bolts presents several dra4vbacks. There must be sufficient bolts available on the job site; there are labor and parts costs to deal with; and the complexity of the job is increased. Moreover, where an extension shaft is to be bolted to the preceding shaft, the preceding shaft may have been driven near or well into the ground making access for application of multiple bolts a difficult and tedious task. And should the operator fail to include the required number of bolts, the 3~ system might fail.
Summary of the Invention Typically, the installation procedure for each section of a helix blade system involves attaching the section to the torque motor, rotationall~~
driving the section into the ground, removing the section from the torque motor, attaching the next section, and repeating the process. The attachment to the torque motor is typically the same as the attachment between sections. Hence, each attachment must be made, unmade, and remade for every section. Helix blade systems commonly require four or more sections. Rotational driving into the ~ ound is a comparatively quick process.
Hence, the makin' and unmaking of attachments comprises much of the time required for installation of helix blade systems. The number of bolts required for each section attachment is perhaps the most important factor governing helix blade system installation time.
The axial holding capacity of a helix blade system in the around is directly proportional to the installation torque. Therefore, the torsional strength of a 1~ helix blade system and that of attachments between sections govern the overall performance of the total helix blade system in supponin~ foundation loads, in an underpinning capacity, or in serving as an earth anchor.
Contrary to widely believed misconceptions regarding helix blade system attachments, the number of bolts use in making an attachment is not a significant factor ?0 affecting its torsional strength. The torsional shear strength of a tubular shaft with a liven diameter depends on the rotational moment of inertia which is primarily a function of cross-sectional area. Therefore, increasing the cross-sectional area of an attachment can increase the torsional strength of a helix blade system.
The present invention provides an improved tubular pipe helix blade ?a system which may be attached with only a single bolt, and yet has improved torsional _3_ , strength. To this end, and in accordance with the principles of the present invention, an attachment end of a tubular shaft is provided with a sleeve fitted over (external of) or within (internal of) the shaft at that end so as to provide an enhanced Lvall thickness to the cylindrical wall at the attachment end of the shaft, and thus increased cross-sectional area of the attachment. The sleeve and the attachment end of the shaft are provided with a bolt receiver, such as holes extending transverse to the longitudinal axis of the shaft.
The end of the shaft may be the trailing end of a shaft, adapted to fit into the driver shaft or a collar of the next shaft, or may be at the distal or leading end of a shaft adapted to fit into a collar of the preceding shaft. In either case, the shaft and the sleeve present a coaxial pair of cylindrical pipe sections that have a collective wall thickness greater than the wall thickness of just the shaft end. As a consequence, the shaft end may be attached to the driver shaft or adjacent shaft by only one bolt while able to transmit the high torques expected to be encountered.
Advantageously, the sleeve and shaft end are affixed together. In one 1i embodiment, they may be affixed by piu~ welding. To this end, a hole is formed on the exterior component (the shaft if the sleeve is internal of the shaft, and the sleeve if it is external of the shaft), and the hole is used to create a plug weld thereat to the sleeve or shaft therewithin. There may be more than one hole and plug weld, such as an opposed pair. Other affixation techniques may be used, as will be easily understood by those skilled in the art. Further advantageously, the shaft and the sleeve may be cylindrical and the inner diameter of the shaft end and the outer diameter of the sleeve where the sleeve is internal of the shaft, or the inner diameter of the sleeve and the outer diameter of the shaft end where the sleeve is external of the shaft, are approximately equal so that the fit is snug. 1'et further, the sleeve may extendybeyond the adjacent end of the shaft so as to project therefrom, or may be flush to or behind the end of the shaft, provided that there is a length of sleeve above and below the bolt receiver holes formed therein.
In accordance with a yet further aspect of the present invention, the wall thickness of the shaft and the wall thickness of the sleeve are approximately the same.
As a consequence, there is provided at the attachment end of the shaft a double wall thickness.
With the improved helix blade system of the present invention, the shaft end may be attached to the driver shaft or adjacent shaft by only one bolt while able to transmit the high torques expected to be encountered. By virtue of the foreaoin~, there is thus provided an improved tubular pipe helix blade system which may be attached by a single bolt, and yet has improved torsional strength. These and other objects and advantages of the present invention shall be made apparent from the accompanying drawings and the description thereof.
Brief Description of the Drawings 1~ The accompanying drawings, which are incorporated in and constitute a part of this specification 'illustrate embodiments of the invention and, together with a general description of the invention given above, and the detailed description of the embodiments liven below, serve to explain the principles of the invention.
Fig. 1 is a perspective view of an exemplary helix blade system for 30 proposes of explaining the principles of the present invention;
Fia. ? is a cross-sectional view of one embodiment of the trailing end of the lower shaft of the helix blade system of Fig. 1 showing a sleeve internal of the shaft in accordance with the principles of the present invention:
Fio. 3 is a view taken along line s-3 of Fib. ?;
_5_ Fig. 4 is a cross-sectional view of the one embodiment of the ieadin~ end of the upper shaft of the helix blade system of Fig. 1 showing a collar for receiving the trailing end embodiment of Fig. 2:
Fig. a is a cross-sectional view of another embodiment of the trailing end of the lower shaft of the helix blade system of Fig. I showing a sleeve external of the shaft in accordance with the principles of the present invention;
Fig. 6 is a view taken along line 6-6 of Fig. ~;
Fig. 7 is a cross-sectional view of another embodiment of the leading end of the upper shaft of the helix blade system of Fig. 1 showing a collar for receiving the trailing end embodiment of Fig. 5;
Fig. $ is a schematic view of a torque motor drive with an upper shaft from Fig. 1;
Fig. 9 is a perspective view of one embodiment of an extension shaft having the sleeve and collar embodiments of Fibs. ?-4;
1~ Fig. 10 is a perspective view of another embodiment of an extension y shaft having the sleeve and cdllar embodiments of Fies. 5-7; and Fig. 1 I is a perspective view of a building structure supported by a plurality of helix blade systems of Fig. 1 for purposes of explaining use of the present mvennon.
Detailed Description of the Drawings ~~~ith reference to Fig. I there is shown a tubular pipe helix blade system 10 comprised of a lower shaft 1? and an upper shaft 14 joined together as at coupler 16 as will be described hereinafter. Shaft 1? may be in the form of a cylindrical steel pipe with a helix blade 30 mounted thereto. One or more additional helix blades) ?
I (only one shown) may also be maunted to pipe 13 spaced from blade 20 as will be readily -6- , appreciated by those skilled in the art. Blades 20 and 31 (if provided) may be conventional helix blades, or may be as shown in my aforementioned U.S. Patent No.
6,068,662. In the embodiment shown herein, each blade 30, ? 1 has a dual cutting edge provided by forming one half 3? of the blade to a first radius which may be lamer for 6 blade 31 than for blade 20. The other, opposite half 23 is formed to a second radius which may also be larger far blade 21 than blade 20, but which is less than the first radius of the associated blade. The smaller radius portion 23 of each blade is advantageously displaced below the larger radius portion along shaft 12. The leading cutting edges 24, 26 on the blades may be beveled to facilitate cutting in of the blade into the ground 200 (Fig. 11) as will be described hereinafter. The distal or leading end 30 of shaft 12 may be formed to enhance cutting into ?round 200. To this end, a beveled edge 32 may be formed at end 30 as shown in Fig. 1, or a point (not shown) may be formed along the longitudinal axis 34 of shaft 1? such as by a solid end segment (not shown) attached to end 30. Other configurations for end 30 may be utilized as 16 desired. The edge 36 (Figs. '? and ~) of proximal or trailing end 36 of pipe 1? is generally perpendicular to longitudinal axis 34 of pipe 1?, and end 36 is to be coupled to shaft 14 as at 16 as will be hereinafter described.
Upper shaft 14 is also formed by a cylindrical steel pipe having at least a distal or leading end 40 to couple to pipe 12. The edee 41 of leading end 40 is also advantageously perpendicular to longitudinal axis 34 thereof. Although the dimensions need not be the same, for purposes of describing the invention, common diameters will be used for pipes 1? and 14 to simplify the discussion. To this end, pipes 1?
and 14 each have a cylindrical sidewall 49 (see Figs. ?-7) defining a wall thickness VJ 1 between the inner diameter D1 and outer diameter D? thereof. Typically, the wall thickness ~T~'1 is about 1/8 inch or about 1/4 inch, with an outer diameter D2 of about 3 inches.
In accordance with the principles of the present invention, it is desired to couple the end 36 of shaft 12 to the end 40 of shaft 14 advantageously using one bolt ~0, such as a Grade ~ bolt or better, with improved torsional strength by providing a greater cross-sectional area so as to obtain torque strength such as 10,000 ft.tb, and possibly in the neighborhood of 13,000 ft. 1b. To this end, the coupling 16 occurs at the attachment ends 36 and/or 40 of pipes 12 and 14 by providing one of those ends 36 or 40 with a tubular, such as cylindrical, steel collar ~? and the other of those ends 36 or 40 with an enhanced wall thic-ness by addition of a tubular, such as cylindrical, steel sleeve 60 (internal) or 70 (external) as will be described with reference to Figs. 3-4 and 5-7, respectively. For sake of simplicity, collar ~? will be described as attached to end 40 of pipe 14, with sleeve 60 or 70 being mounted or affixed along the end 36 of pipe 12, although it will be appreciated that the collar could be on end 36 and the sleeve along end 40.
Looping first at the internal sleeve 60, with reference to Fias. 2 and 3, 1~ sleeve 60 has a sidewall 62 of predetermined thickness W2 as defined between its inner diameter D3 and its outer diameter D4. The outer diameter D4 of sleeve 60 is approximately equal to or slightly Less than inner diameter D1 of pipe 12 so as to fit internal of pipe 12 at end 36, and advantageously snugly therein. Sleeve 60 is affixed to pipe 1? so as to extend along and into end 36 thereof and in overlapping or coaxial relationship therewith. Sleeve 60 may also extend outwardly therefrom or may be recessed therefrom (both not shown), although in the embodiment shown, sleeve ends at edge 61 generaily flush with edge 35 of pipe 12. One or more one inch diameter apertures 64 (Fib. 3) are formed about 3 3I4 inches from the edge 3, in sidewall 49 of pipe 12 adjacent sleeve 60 so as to expose sidewall 62 thereof through the apertures 64.
A plug weld 66 is formed to fill flush each aperture 64 to secure sleeve 60 to pipe 13 with a 70 KSI minimum ~rield weld.
Ali?ned one inch diameter bolt holes 65 are provided ihrou~h the sidewalls 49 and 6? about two inches from the edges 35 and 61 and at 90' to welds 66 (if an oppositely disposed pair is provided as shown) to receive therethrouoh a Grade ~
(or better) bolt ~0 (Fig. 1). Bolt ~0 thus interacts with the bolt holes 65 of both sleeve 60 and pipe 1?, for example. Collar ~? for use with the embodiment of Figs. 2 and 3 has an inner diameter D7 approximately equal to or slightly lamer than the outer diameter D2 of pipe 12 so as to removably receive therein pipe end 36 with sleeve 60.
One inch diameter bolt holes 67 are provided in collar wall 68, about two inches from edge 69, to also receive bolt ~0 and secure pipe end 36 to pipe end 40.
With sleeve 60 internal of pipe 12, there is provided a coaxial pair of pipe sections 36, 60 with a collective wall thickness W3 greater than wall thickness W1.
Advantageously, wall thickness W2 of sleeve 60 is approximately equal to wall 1~ thickness Wl so as to provide at end 36 a double wall thickness of pipe for joining to pipe 14. The collective Hall thickness W3 is believed to provide the ability to withstand the transfer of torque between shafts 12 and 14 at the high levels of torque expected to be encountered while advantageously using one bolt ~0 to couple shafts 1? and together, thereby eliminating the need for, and drawbacks associated with use of, multiple bolts to couple the shafts together.
With reference to Figs. i and 6, the enhanced wall thickness W3 may also be achieved by placing sleeve 70 external of shaft 12, rather than placing sleeve 60 internal thereof. To this end. sleeve 70 has a sidewall 7? of predetermined thickness W4 as defined between its inner diameter D~ and its outer diameter D6. The inner diameter D~ of sleeve 70 is approximately equal to or slightly larger than outer diameter D2 of pipe 13 so as to fit external of pipe 12 at end 36,.and advantageously snugly therealong. Sleeve 70 is affixed to pipe 12 so as to extend along end 36 thereof in overlapping or coaxial relationship, and may also extend outwardly therefrom or be recessed therefrom (both not shown), although in the embodiment shown, the edge 71 of sleeve 70 ends flush with edge 35 at end 36 of pipe 12. One or more one inch apertures 74 are formed in sidewall 72 of sleeve 70 below edge 71 and adjacent pipe end 36 so as to expose sidewall 49 thereof through the apertures 74. A plug weld 66 is fotTrted to fill flush in each aperture 74 to secure sleeve 70 to pipe 1?.
As with the embodiment of Figs. ? and 3, aligned bolt holes 6~ are provided through the sidewalk 72 and 49 to receive therethroujh a number ~ (or better) bolt 30. With reference to Fig. 7, collar S2 to be used with the embodiment of Figs. S
and 6 has an inner diameter D8 approximately equal to or slightly larjer than the outer diameter D~ of sleeve 70 (and therefore much larger than diameter D2 of pipe 12) so as to removably receive therein sleeve 70 with pipe end 36. As above, bolt holes 67 are 1~ provided in collar wall 68 to also receive bolt ~0 and secure pipe end 36 to pipe end 40.
V~'ith sleeve 70 external of pipe 13, there is provided a coaxial pair of pipe sections 36, 70 with a collective wall thickness W3 greater than wall thickness W 1.
Advantageously, wall thickness W4 of sleeve 70 is approximately equal to wall thickness W1 so as to provide at end 36 a double wall thickness of pipe for joining to ?0 pipe 14. The collective wall thickness W3 is believed to provide the ability to withstand the transfer of torque between shafts 1? and 14 at the high levels of torque expected to be encountered while using only one bolt 6~ to couple shafts 1? and 14 together, thereby eliminating the need for, and drawbacks associated with use of, multiple bolts to couple the shafts toeether.
-lU-Pipe 14 may be the shaft.of a torque motor driver 100 as shown in Fig. 8.
End 40 may thus be provided with the appropriately sized collar ~2 (as shown in Fig. 8) or sleeve 60, 70 depending upon how end 36 of shaft 12 is configured. When shafts 14 and 13 are bolted together as above-described, activation of driver 100 will impart rotational torque through shaft 14 to shaft 13 to rotate helix blade 30 and, if present, blades) 21.
For extension of shaft 1?, shaft 14 may be an extension shaft 14a or 14b as shown in Fios. 9 and 10, respectively. In those embodiments, when a collar ~2 is mounted to end 40 of pipe 14a or 14b, the other end 80 of pipe 14a or 14b is provided with either an internal or external sleeve 60 (Fig. 9) or 70 (Fig. 10) as above described for attachment to another shaft in succession. Alternatively, where a collar 52 is on pipe 12, end 40 of pipe 14a or 14b includes the sleeve 60 or 70 and the other end 80 of pipe 14a or 14b may be provided with an appropriately sized collar ~?.
In use, and with reference to Fig. 11, a plurality of helix blades 20 (and possibly 21, if present) are to be driven into ground ?00 by rotation applied to ends 36 of pipes 12. Advantageously,'in each system 10, either shaft 13 or shaft 14 (which in the first instance may be pan of driver 100) are provided with the enhanced wall thickness sleeve 60 or 70, and an appropriately sized collar 52, and they are joined together by only one bolt ~0 extendin' through bolt holes 6~ and 67. A nut ~ 1 may be used to secure bolt ~0 in place. Rotation is imparted to shafts 14 by a plurality of drivers 100 to drive respective blades 20 (and 31) into ground 200 such as adjacent a building structure ?10 which is to be supported thereon. If blades 20 are driven far enough into ground 300, then shafts 14 and drivers 100 may be removed and the building placed atop ends 36 for support or pierin~ (such as with brackets ?
13) as is ~i conventional. .Alternatively, one or more shafts 1? with blades 20 may be driven into ground ?00 at a steep an_le (not shown) to provide a tie-back to a foundational wall 314 of building ?10. If blades ?0 are to go deeper into the ground than is possible with the length of pipes 13, which may be 5 or 6 feet long, then a plurality of second shafts, such as extension shafts 14a or 14b, which may be 1, S or 10 feet in length, for example, are to be connected to respective shafts 12 as above described, each with only one bolt ~0.
Torque is then applied to the respective ends 80 of shafts 14a or 14b which transmit the torque to shafts 12 to rotate blades 20 further into ground 200 as desired.
Further extension shafts 14a or 14b may be applied in succession as will be readily apparent to those skilled in the art. The building 210 may be supported on the extension assembly of shafts 12 and extension shafts 14a or 14b, for example.
Pipes 12, 14, sleeves 60, 70, and collar 52 may be ASTM A-~ 13 101/1020 @ 70 KSI Ultimate Tensile/Compression steel. Sleeves 60, 70 advantageously have a wall thickness W2, W4 of about 1/4 inch, and are advantageously about six inches long. The outer diameter D4 of sleeve 60 is 1~ advantageously about 2 1/2 inches. The wall 68 of collar ~2 for use with the sleeve 60 embodiment of Fijs. 2 and 3 has a thickness about 1/4 inch thick, and has a length of about five inches, and an outer diameter of about 1 p/8 inch. Advantageously, collar ~3 is slid over shaft end 40 (or 36) to about 7/8 inch from the end and welded full circumference thereto as at 2;0.
By virtue of the foregoing, there is thus provided an improved helix blade system which may attach with a single bolt, and yet has improved torsional strength.
While the present invention has been illustrated by the description of embodiments thereof and specific examples, and while the embodiments have been described in considerable detail, it is not intended to restrict or in any way limit the _I~_ , scope of the appended claims to such detail. Additional advantages and modifications will readily appear to those spilled in the art. For example, although only one bolt hole set is shown at 16, multiple bolt hole sets may be provided for various purposes, including longitudinal offset of the pipes and/or use of multiple bolts, if desired.
Further, while the term collar is used, it will be appreciated that the term is meant to include receiver, socket or other such structure intended to receive therein the coaxial pair of the attachment end and the sleeve of another shaft of the helix blade system.
Still further, while cylindrical pipe shafts or sections are shown, it will be appreciated that tubular pipes or other cross-sections may be used, such as square or hexagonal tubes. Moreover, the interior of the pipe may be filled with material such as grout, glue or concrete, as will be readily appreciated by those skilled in the art. The invention in its broader aspects is, therefore, not limited to the specific details, representative apparatus and method, and illustrative examples shown and described.
Accordingly, departures may be made from such details without departing from the spirit or scope of 1~ the general inventive concept.
Having described the invention, what is claimed is:
-13- ,
Claims (26)
1. A helix blade system comprising:
a tubular pipe shaft having an attachment end;
at least one helix blade coupled to the shaft;
a sleeve affixed along the attachment end of the shaft in overlapping relationship therewith; and means in the sleeve and in the shaft for receiving a bolt whereby when the sleeve and shaft are received in a collar, they may be bolted thereto with a single bolt and withstand applied torque from the collar to cause rotation of said helix blade.
a tubular pipe shaft having an attachment end;
at least one helix blade coupled to the shaft;
a sleeve affixed along the attachment end of the shaft in overlapping relationship therewith; and means in the sleeve and in the shaft for receiving a bolt whereby when the sleeve and shaft are received in a collar, they may be bolted thereto with a single bolt and withstand applied torque from the collar to cause rotation of said helix blade.
2. The helix blade system of claim 1, the sleeve being interior of the shaft.
3. The helix blade system of claim 1, the sleeve being exterior of the shaft.
4. The helix blade system of claim 1, the sleeve and the shaft being affixed together.
5. The helix blade system of claim 4 further including a plug weld whereby to affix the sleeve to the shaft.
6. The helix blade system of claim 1, the pipe shaft being cylindrical.
7. The helix blade system of claim 6, the sleeve being cylindrical.
8. The helix blade system of claim 1, the sleeve being cylindrical
9. A first tubular shaft of a helix blade system having an attachment end adapted to be removably received in a collar attached to a second shaft of said helix blade system, G5e attachment end having a first wall thickness and a sleeve affixed thereto in overlapping relationship, the sleeve having a second wall thickness; and bolt receiving means formed through the wall thicknesses of both the attachment end and the sleeve whereby to be bolted to said collar when the attachment end is received therein so as to couple torque between the shafts and rotate a blade supported on one of said shafts.
10. The first tubular shaft of claim 9, the sleeve being interior of the attachment end.
11. The first tubular shaft of claim 9, the sleeve being exterior of the attachment end.
12. The first tubular shaft of claim 9, the wall thickness of the sleeve and the wall thickness of the attachment end being approximately equal.
13. The first tubular shaft of claim 9, the attachment end being cylindrical.
14. A first tubular shaft of a helix blade system having an attachment end adapted to be removably received in a collar attached to a second shaft of said helix blade system, the attachment end comprising a pair of coaxial pipe sections affixed together to define a collective wall thickness greater than a wail thickness of either pipe section, and bolt receiving means formed through the collective wall thickness of the pair of pipe sections.
15. The first tubular shaft of claim 14, the coaxial pipe sections being cylindrical.
16. An extension shaft for a helix blade system comprising:
a cylindrical pipe having a first end and a second end, the pipe having an inner diameter and an outer diameter defining a first wall thickness;
a cylindrical collar mounted to the first end of the pipe, the collar having an inner diameter;
a cylindrical sleeve mounted in overlapping relationship to the second end of the pipe and heaving a second wall thickness defined between outer and inner diameters of the sleeve so as to define at the second end of the pipe an overall thickness greater than at least the first wall thickness of the pipe, the inner diameter of the collar corresponding to the outer diameter of one of the sleeve and the second end of the pipe.
a cylindrical pipe having a first end and a second end, the pipe having an inner diameter and an outer diameter defining a first wall thickness;
a cylindrical collar mounted to the first end of the pipe, the collar having an inner diameter;
a cylindrical sleeve mounted in overlapping relationship to the second end of the pipe and heaving a second wall thickness defined between outer and inner diameters of the sleeve so as to define at the second end of the pipe an overall thickness greater than at least the first wall thickness of the pipe, the inner diameter of the collar corresponding to the outer diameter of one of the sleeve and the second end of the pipe.
17. The extension shaft of claim 16, the sleeve being interior of the pipe second end, the collar inner diameter corresponding to the outer diameter of the pipe.
18. The extension shaft of claim 17, wherein the outer diameter of the sleeve is approximately equal to the inner diameter of the pipe.
19. The extension shaft of claim 16, the sleeve being exterior of the pipe, the collar inner diameter corresponding to the outer diameter of the sleeve.
20. The extension shaft of claim 19 wherein the inner diameter of the sleeve is approximately equal to the outer diameter of the pipe.
21. The extension shaft of claim 16 wherein the wall thickness of the pipe and the wall thickness of the sleeve are approximately equal.
22. A helix blade system comprising in combination:
a first tubular section having a first attachment end and an opposite end and at least one helix blade coupled to the pipe;
a second tubular section have at least a second attachment end; and a coupler joining the second attachment end of the second tubular section to the first tubular section at the first and second attachment ends, the coupler having (a) a collar attached to one of the first and second attachment ends, and (b) a sleeve affixed in overlapping relationship to the other of the first and second attachment ends and the attachment end and affixed sleeve thereto being received in the collar.
a first tubular section having a first attachment end and an opposite end and at least one helix blade coupled to the pipe;
a second tubular section have at least a second attachment end; and a coupler joining the second attachment end of the second tubular section to the first tubular section at the first and second attachment ends, the coupler having (a) a collar attached to one of the first and second attachment ends, and (b) a sleeve affixed in overlapping relationship to the other of the first and second attachment ends and the attachment end and affixed sleeve thereto being received in the collar.
23. The helix blade system of claim 22, the sleeve being internal of the attachment end to which it is affixed.
24. The helix blade system of claim 22, the sleeve being external of the attachment end to which it is affixed.
25. The helix blade system of claim 22, further comprising at least one bolt holding the attachment end and affixed sleeve and the collar together.
26. The helix blade system of claim 25 having only one bolt holding the attachment end and affixed sleeve and the collar together.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/US2002/005514 WO2003074794A1 (en) | 2002-02-25 | 2002-02-25 | Tubular pipe helix blade system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2394894A1 true CA2394894A1 (en) | 2003-08-25 |
Family
ID=27787359
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002394894A Abandoned CA2394894A1 (en) | 2002-02-25 | 2002-02-25 | Tubular pipe helix blade system |
Country Status (2)
| Country | Link |
|---|---|
| CA (1) | CA2394894A1 (en) |
| WO (1) | WO2003074794A1 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20170101759A1 (en) * | 2015-10-09 | 2017-04-13 | American Piledriving Equipment, Inc. | Split Flight Pile Systems and Methods |
| US9957684B2 (en) | 2015-12-11 | 2018-05-01 | American Piledriving Equipment, Inc. | Systems and methods for installing pile structures in permafrost |
| US10392871B2 (en) | 2015-11-18 | 2019-08-27 | American Piledriving Equipment, Inc. | Earth boring systems and methods with integral debris removal |
| CN111364490A (en) * | 2020-03-25 | 2020-07-03 | 上海勘测设计研究院有限公司 | High pile cap foundation based on driven and rotated piles and construction method thereof |
| US10760602B2 (en) | 2015-06-08 | 2020-09-01 | American Piledriving Equipment, Inc. | Systems and methods for connecting a structural member to a pile |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2411909A (en) * | 2004-03-08 | 2005-09-14 | Aspin Foundations Ltd | Tubular foundation element |
| US10767334B2 (en) | 2018-03-02 | 2020-09-08 | Magnum Piering, Inc. | Grouted helical pile |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3999391A (en) * | 1975-06-12 | 1976-12-28 | Meredith Drilling Co., Inc. | Tie-back anchor components and method for a shoring system |
| US5171107A (en) * | 1990-01-16 | 1992-12-15 | A. B. Chance Company | Method of underpinning existing structures |
| US5904447A (en) * | 1997-07-02 | 1999-05-18 | Integrated Stabilization Technologies Inc. | Drive device used for soil stabilization |
| US6058662A (en) * | 1997-07-18 | 2000-05-09 | Secure Products, Llc | Earth anchors and methods for their use |
-
2002
- 2002-02-25 CA CA002394894A patent/CA2394894A1/en not_active Abandoned
- 2002-02-25 WO PCT/US2002/005514 patent/WO2003074794A1/en active Application Filing
Cited By (6)
| 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 |
| US20170101759A1 (en) * | 2015-10-09 | 2017-04-13 | American Piledriving Equipment, Inc. | Split Flight Pile Systems and Methods |
| 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 |
| CN111364490A (en) * | 2020-03-25 | 2020-07-03 | 上海勘测设计研究院有限公司 | High pile cap foundation based on driven and rotated piles and construction method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2003074794A1 (en) | 2003-09-12 |
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