The present invention relates to installing piles in soil, in particular, to helical piles that are driven into soil by rotation of a shaft.
A helical pile is a segmented deep foundation system with helical load-bearing plates usually welded to a central steel shaft. The helical plates usually have a uniform pitch and are spaced far enough apart so that they function independently as individual bearing elements. Installation typically involves driving the shaft in rotation by means of a hydraulic motor. Shaft segments (with or without load-bearing plates) may be added until a desired soil depth or load-bearing capacity is reached.
The central steel shafts that carry the helical bearing plates are typically square or round (i.e., circular) in cross-section. Round and square shaft segments may be used in combination, for example, in areas where soft/loose soils are located above the bearing strata (i.e., hard/dense soils) for the bearing plates. The round shaft, which has a greater section modulus, will resist columnar buckling in the soft/loose soil. The square shaft will allow adequate penetration of the helices into the hard/dense material to achieve proper load-bearing capacity without “spin-out,” i.e., loss of thrust of the helices in the soft/loose material. Shaft segments typically are joined with complicated, costly fabricated transition couplings. Bolts, which fasten the shaft segments to the coupling, bear at least some of the axial compression load.
The invention provides an improved transition coupling for helical soil pile assemblies that transfers axial compression loads between the coupled shaft segments with little or no axial compression loading on the bolts that fasten the parts together.
According to one aspect, the invention is directed to a coupling for connecting a hollow end of a rotatable cylindrical first shaft to an end of a second shaft, the coupling comprising a body having a first end, a second end opposite the first end, and a longitudinal axis extending between the first end and the second end. The body comprises a socket having a side wall adapted to closely receive the end of the second shaft. The socket extends axially into the body from the second end to a socket bottom facing toward the second end and adapted to axially abut the end of the second shaft. The body also comprises at least one shoulder between the first end and the second end extending laterally outward from the body and facing toward the first end. The body further comprises a cylindrical portion adapted to fit closely within the hollow end of the first shaft. The cylindrical portion extends axially from the first end toward the second end up to the shoulder, which is adapted to abut the end of the first shaft. At least one pair of aligned transverse holes in the body is adapted to receive a fastener.
According to another aspect, the invention is directed to a coupling for connecting a hollow end of a rotatable cylindrical first shaft to an end of a second shaft, the coupling comprising a body having a first end, a second end opposite the first end, and a longitudinal axis extending between the first end and the second end. The body comprises a socket having a side wall adapted to closely receive the end of the second shaft. The socket extends axially into the body from the second end to a socket bottom adapted to axially abut the end of the second shaft. The body also comprises a cylindrical portion extending axially from the first end toward the second end and beyond the socket bottom, and a first pair of aligned transverse holes in the side wall of the socket, which is adapted to receive a fastener. Preferably, the first pair of aligned transverse holes are in the cylindrical portion, which preferably has a second pair of aligned transverse holes adapted to receive another fastener.
Coupling embodiments can be configured to join two cylindrical shafts or to join two shafts having distinctly different cross-sections, such as a cylindrical shaft and a square shaft. As to all coupling embodiments, it is preferred that the body be formed as one piece by any suitable process, such as casting, forging, machining, etc., and that it taper inwardly near and toward the second end, through which the socket extends.
The invention also is directed to a helical soil pile assembly that incorporates any of the coupling embodiments outlined above.
Additional features and advantages of the invention will be apparent from the following detailed description.
Preferred embodiments of the invention are described in detail below, purely by way of example, with reference to the accompanying drawing, in which:
Referring to
Referring to
Referring to
While various embodiments and have been chosen to illustrate the invention, it will be understood by those skilled in the art that various changes and modifications may be made. For example, any of the couplings described above can be provided with a differently configured socket: the couplings of
Number | Name | Date | Kind |
---|---|---|---|
1074275 | MacLean | Sep 1913 | A |
1227105 | Barnes | May 1917 | A |
1507138 | Pierce | Sep 1924 | A |
1832404 | Marsden | Nov 1931 | A |
2135389 | Dempsey | Nov 1938 | A |
2260811 | Kozak | Oct 1941 | A |
2341272 | Firth et al. | Feb 1944 | A |
2362856 | Strunk et al. | Nov 1944 | A |
2584015 | Hawes | Jan 1952 | A |
2829503 | Hayes | Apr 1958 | A |
2883223 | Petersen | Apr 1959 | A |
3080749 | Hollander | Mar 1963 | A |
3148510 | Sullivan | Sep 1964 | A |
3178210 | Dickinson | Apr 1965 | A |
3353852 | Wood | Nov 1967 | A |
3356168 | Johnson | Dec 1967 | A |
3360285 | Huckshold | Dec 1967 | A |
3377077 | Hollander et al. | Apr 1968 | A |
3382937 | Watts | May 1968 | A |
3410097 | Young | Nov 1968 | A |
3504500 | Fristedt | Apr 1970 | A |
3554306 | Wilburn | Jan 1971 | A |
3662436 | Roza | May 1972 | A |
3748863 | Pogonowski et al. | Jul 1973 | A |
3828562 | Petres | Aug 1974 | A |
3832861 | Jahnke et al. | Sep 1974 | A |
3986570 | Stinson et al. | Oct 1976 | A |
4102141 | Ingalls | Jul 1978 | A |
4239419 | Gillen, Jr. | Dec 1980 | A |
4280768 | Pardue et al. | Jul 1981 | A |
4290245 | Pardue et al. | Sep 1981 | A |
4316350 | Watson | Feb 1982 | A |
4334392 | Dziedzic | Jun 1982 | A |
4436452 | Bodine | Mar 1984 | A |
4499698 | Hoyt et al. | Feb 1985 | A |
RE32076 | Dziedzic | Feb 1986 | E |
4607984 | Cassidy | Aug 1986 | A |
4691818 | Weber | Sep 1987 | A |
4754588 | Gregory | Jul 1988 | A |
4803812 | Alexander, Sr. | Feb 1989 | A |
4981000 | Hamilton et al. | Jan 1991 | A |
4996806 | Platz | Mar 1991 | A |
5004095 | Lapeyre et al. | Apr 1991 | A |
5012622 | Sato et al. | May 1991 | A |
5066168 | Holdeman | Nov 1991 | A |
5139235 | Kilmer | Aug 1992 | A |
5145286 | Summers | Sep 1992 | A |
5149149 | Wu | Sep 1992 | A |
5295766 | Tiikkainen | Mar 1994 | A |
5320439 | Perrault et al. | Jun 1994 | A |
5477929 | Kenyon et al. | Dec 1995 | A |
5531544 | Willcox, II | Jul 1996 | A |
5542784 | Gårdenberg | Aug 1996 | A |
5556233 | Kovago | Sep 1996 | A |
5575593 | Raaf | Nov 1996 | A |
5641237 | Albert et al. | Jun 1997 | A |
5661946 | Davis | Sep 1997 | A |
5690181 | Shu | Nov 1997 | A |
5707180 | Vickars et al. | Jan 1998 | A |
5829922 | Calandra et al. | Nov 1998 | A |
5833399 | Bullivant | Nov 1998 | A |
5967693 | Braaten et al. | Oct 1999 | A |
5975808 | Fujita | Nov 1999 | A |
5979854 | Lundgren et al. | Nov 1999 | A |
6074133 | Kelsey | Jun 2000 | A |
6152424 | Lapat | Nov 2000 | A |
6183167 | Ruiz et al. | Feb 2001 | B1 |
6264402 | Vickars et al. | Jul 2001 | B1 |
6352391 | Jones | Mar 2002 | B1 |
6412236 | Johnson | Jul 2002 | B1 |
6615554 | Rupiper | Sep 2003 | B2 |
6641332 | Alvarado | Nov 2003 | B1 |
6659692 | May | Dec 2003 | B1 |
6669400 | Sergi | Dec 2003 | B1 |
6709234 | Gilbert et al. | Mar 2004 | B2 |
6722821 | Perko et al. | Apr 2004 | B1 |
6814525 | Whitsett | Nov 2004 | B1 |
6872031 | May | Mar 2005 | B2 |
7037045 | Jones | May 2006 | B2 |
7090437 | Pinkleton | Aug 2006 | B2 |
7112012 | Whitsett | Sep 2006 | B2 |
7165915 | Queen | Jan 2007 | B2 |
7195426 | May | Mar 2007 | B2 |
7220081 | Gantt, Jr. | May 2007 | B1 |
7314335 | Whitsett | Jan 2008 | B2 |
7416367 | St. Onge et al. | Aug 2008 | B2 |
7465128 | Bruneau | Dec 2008 | B2 |
7510350 | Ronnkvist | Mar 2009 | B2 |
7581707 | Saraf | Sep 2009 | B2 |
7625151 | Li et al. | Dec 2009 | B2 |
7645096 | Hedrick | Jan 2010 | B2 |
7722286 | Heald | May 2010 | B2 |
7731454 | Watson et al. | Jun 2010 | B1 |
7744316 | Kaufman | Jun 2010 | B2 |
7854451 | Davis, II | Dec 2010 | B2 |
7891911 | Tschernuth et al. | Feb 2011 | B2 |
7896579 | Craig | Mar 2011 | B2 |
8070392 | Gantt, Jr. | Dec 2011 | B2 |
20010028827 | Vickars et al. | Oct 2001 | A1 |
20030095830 | Nguyen et al. | May 2003 | A1 |
20030159839 | Perko | Aug 2003 | A1 |
20040071511 | May | Apr 2004 | A1 |
20060067794 | Mitchell | Mar 2006 | A1 |
20070243025 | Ronnkvist | Oct 2007 | A1 |
20080170912 | Kaufman | Jul 2008 | A1 |
20090110488 | Pearson | Apr 2009 | A1 |
20100143048 | Lin | Jun 2010 | A1 |
20100202838 | Weaver et al. | Aug 2010 | A1 |
20110194901 | Jones | Aug 2011 | A1 |
Number | Date | Country |
---|---|---|
WO 9312312 | Jun 1993 | WO |
WO 9906639 | Feb 1999 | WO |
Entry |
---|
Chance Civil Construction.Design, Installation and Testing of Helical Piles and Anchors. Apr. 8, 2009; Link: http://www.foundationperformance.org/technical—papers.cfm. |
Product Information Sheet for “Chance Helical Transition Coupler” of Hubbell Power Systems, Inc., Oct. 2006. |
Number | Date | Country | |
---|---|---|---|
20120114425 A1 | May 2012 | US |