EP2971372A1 - Pile axial capacity enhancer - Google Patents
Pile axial capacity enhancerInfo
- Publication number
- EP2971372A1 EP2971372A1 EP14775464.2A EP14775464A EP2971372A1 EP 2971372 A1 EP2971372 A1 EP 2971372A1 EP 14775464 A EP14775464 A EP 14775464A EP 2971372 A1 EP2971372 A1 EP 2971372A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pile
- capacity
- length
- diameter
- enhancer
- 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.)
- Granted
Links
- 239000003623 enhancer Substances 0.000 title claims abstract description 53
- 239000002689 soil Substances 0.000 claims abstract description 13
- 238000000034 method Methods 0.000 claims description 12
- 230000035515 penetration Effects 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000009434 installation Methods 0.000 description 3
- 238000004873 anchoring Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 238000007667 floating Methods 0.000 description 2
- 238000011835 investigation Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000003643 water by type Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000004075 alteration 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
- 238000010276 construction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000010959 steel Substances 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
- E02D5/48—Piles varying in construction along their length, i.e. along the body between head and shoe, e.g. made of different materials along their length
-
- 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
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/32—Foundations for special purposes
- E02D27/52—Submerged foundations, i.e. submerged in open water
-
- 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
- E02D5/223—Details of top sections of foundation 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
- E02D5/52—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
- E02D5/526—Connection means between pile segments
-
- 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
- E02D5/74—Means for anchoring structural elements or bulkheads
- E02D5/80—Ground anchors
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D7/00—Methods or apparatus for placing sheet pile bulkheads, piles, mouldpipes, or other moulds
-
- 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
- E02D2200/165—Shapes polygonal
-
- 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
- E02D2200/165—Shapes polygonal
- E02D2200/1664—Shapes polygonal made from multiple elements
-
- 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
- E02D2200/1685—Shapes cylindrical
Definitions
- This invention generally relates to the field of pile foundation systems, and, more particularly, to piles, either conventional driven piles or suction piles.
- Suction piles also known as suction caissons, suction anchors, bucket foundations and skirt foundations, have found increased use offshore.
- Suction piles have the appearance of an inverted bucket with a sealed top and are installed by first establishing initial penetration into the seabed due to the weight of the pile. Then, subsequent penetration is achieved by the "suction" created by pumping water out from inside the pile. A submersible pump attached to the top of the pile applies suction pressure. When the required depth is reached, the pump can be disconnected and retrieved.
- suction piles differs from traditional piling in that suction piles are typically shorter in length and greater in diameter than traditional piling.
- aspect ratios (pile length to pile diameter) of suction piles range between 0.5 and 8, compared with aspect ratios of 30 to 60 for traditional piles.
- the diameter of a suction pile can range between 4 and 20 meters (12-66 feet), compared with 0.3 to 3 m (1-10 feet) for traditional piles.
- the present invention provides a system and a method to increase the axial holding capacity of a pile by adding a capacity enhancer in the form of an external ring, cylindrical or otherwise, to the pile, often located at the lower end of the pile.
- a capacity enhancer in the form of an external ring, cylindrical or otherwise, to the pile, often located at the lower end of the pile.
- Adding the capacity enhancer to the pile increases the axial holding capacity by increasing the surface area of the pile and maximizing the use of the higher soil strength by engaging the higher strength of the deepest soil layer.
- the axial holding capacity is increased without increasing the overall diameter of the pile or its length, and with a very nominal increase in total weight.
- FIG. 1 is an illustration of an embodiment of a capacity enhancer installed on a pile
- FIG. 2 is a graph of the increase in axial capacity provided by the capacity enhancer over that of a conventional pile
- FIG. 3 is a graph of the increase in axial capacity provided by the capacity enhancer with the increase in total pile weight due to the capacity enhancer;
- FIG. 4 is a graphical illustration of how a capacity enhancer resolves limitations in penetration depth or pile diameter.
- the undrained shear strength of a soil often times increases linearly with depth. In these circumstances, thus the axial capacity of a pile increases with the square of the depth.
- the present disclosure addresses increasing the axial holding capacity of a pile by adding a capacity enhancer in the form of an external ring, cylindrical or otherwise, to the pile, often at the lower end of the pile.
- Adding the capacity enhancer which can also be referred to as a Pile Axial Capacity Enhancer (PACE)
- PACE Pile Axial Capacity Enhancer
- the axial holding capacity is increased without increasing the overall diameter of the pile or its length, and with a very nominal increase in total weight.
- the axial holding capacity is increased, but more costly geotechnical investigations which could have been required for a longer length pile may be avoided.
- the pile may continue to be of a size that can be easily fabricated and installed.
- the present disclosure may be applied to piles either onshore or offshore, above or below the water table.
- the present disclosure may be used to increase the axial capacity of a pile, either bearing, or compression capacity, and/or pull-out, tension, anchoring or upward capacity.
- the capacity enhancer may be any cross-section, such as, for example, circular, triangular, square, octagonal or any polygon shape.
- the shape or cross-section of the capacity enhancer does not have to match shape or cross-section of the pile.
- the capacity enhancer may be made of any suitable material, including but not limited to metal, steel, concrete, etc.
- the pile with the capacity enhancer may be installed by any available method, such as with gravity or dead weight either by itself or with additional ballast, driving, vibrations, suction, or any combination of these or other methods.
- FIG 1 illustrates an embodiment in which a pile 100 is embedded below the seafloor 102, by conventional measures such as suction or driving the pile, as described previously.
- the pile 100 has a length L and comprises a capacity enhancer 104 that is connected to the bottom of the pile.
- the capacity enhancer 104 has a length L ce and an outer diameter D ce .
- the diameter D ce of the capacity enhancer 104 is greater than the diameter D of the pile 100.
- the ratio of the length L ce to the D ce of the capacity enhancer can range between 0.2 to 1, with dimensions outside of this range possible.
- the capacity enhancer 104 is connected concentrically with pile 100, in other embodiments, the capacity enhancer could be connected non-concentrically with the pile.
- the capacity enhancer is located in the deeper regions of the soil, which usually has the highest shear strength, providing increased pile surface area of in a local soil region of highest shear strength. This will significantly increase the axial holding capacity of the pile.
- the capacity enhancer may be attached to the end or other location of the pile by any suitable means known in the art, such as, for example, by welding.
- the capacity enhancer may also be constructed of any suitable material used in the industry.
- Figure 2 illustrates graphically the increase in axial capacity provided by the capacity enhancer over that of a conventional pile.
- Figure 2 is a graphical presentation of axial capacity calculations 200 made for a base pile anchor of 18 feet diameter and 100 feet length with a capacity enhancer of four different diameters and various lengths ranging from 2 feet to 20 feet.
- the x-axis 202 of the graph provides the length in feet of the capacity enhancer; the y-axis 204 provides the increase in capacity over that of the same size conventional base pile.
- Line 206 provides the calculated capacity increases for the addition of a capacity enhancer with a diameter of 24 feet.
- Line 208 provides the calculated capacity increases for the addition of a capacity enhancer with a diameter of 26 feet.
- Line 210 provides the calculated capacity increases for the addition of a capacity enhancer with a diameter of 28 feet.
- Line 212 provides the calculated capacity increases for the addition of a capacity enhancer with a diameter of 30 feet.
- a capacity enhancer of 26 feet diameter and 12 feet in length provides a 40% higher axial capacity compared to that of a base pile of the same size (diameter and length) without a capacity enhancer.
- the ratio of the length of the base pile to the length of the capacity enhancer may be between 5 to 20.
- the ratio of the diameter of the capacity enhancer to the diameter of the pile may be between 1.2 to 2.
- Figure 3 illustrates graphically the increase in axial capacity provided by the capacity enhancer with the increase in total pile weight due to the capacity enhancer.
- the x- axis 302 of the graph provides the percent increase in pile weight due to the capacity enhancer; the y-axis 304 provides the increase in capacity over that of the base pile.
- a capacity enhancer can achieve 40% and 80% axial capacity increase for only a 15% and 31% increase in total pile weight.
- FIG. 4 illustrates how a capacity enhancer resolves limitations in penetration depth or pile diameter.
- the graph 400 provides an indication of resisting force on the x axis 402 and depth below the mudline 401 on the y-axis 404, with increasing depth in the direction of the arrow 403.
- Line 406 is the shaft resistance to penetration of the pile depending upon the depth
- line 408 is the end bearing resistance against which the pile can be pulled down into the seabed using the suction pump.
- the end bearing resistance exceeds the shaft friction until a certain depth is achieved, which is indicated at line 410.
- the pile cannot be penetrated any further into the seabed because the shaft friction resistance exceeds the end bearing resistance, which results in soil plug pull out. In other words, at this point, it is easier for the soil plug to be sucked up inside the pile than for the pile to continue sinking into the seabed.
- pile 412 indicates that, to achieve a given axial capacity, suction pile 412 with a diameter D would need to be too long and would not be able to penetrate far enough into the seabed.
- the diameter of the pile could be increased to diameter D' and have an acceptable length, as shown for pile 414, however the diameter D' of pile 414 presents problems and increased costs in design, fabrication and installation.
- pile 416 meets the given axial capacity, has an overall acceptable length, and is designed with an acceptable diameter D.
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US201361780040P | 2013-03-13 | 2013-03-13 | |
PCT/US2014/013227 WO2014158334A1 (en) | 2013-03-13 | 2014-01-27 | Pile axial capacity enhancer |
Publications (3)
Publication Number | Publication Date |
---|---|
EP2971372A1 true EP2971372A1 (en) | 2016-01-20 |
EP2971372A4 EP2971372A4 (en) | 2016-11-09 |
EP2971372B1 EP2971372B1 (en) | 2018-04-25 |
Family
ID=51624992
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP14775464.2A Not-in-force EP2971372B1 (en) | 2013-03-13 | 2014-01-27 | Axial capacity enhanced pile |
Country Status (8)
Country | Link |
---|---|
US (1) | US20160010303A1 (en) |
EP (1) | EP2971372B1 (en) |
AU (1) | AU2014242367C1 (en) |
BR (1) | BR112015018800A2 (en) |
CA (1) | CA2900907C (en) |
NZ (1) | NZ712647A (en) |
SG (1) | SG11201506120RA (en) |
WO (1) | WO2014158334A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN115653011B (en) * | 2022-10-20 | 2023-05-02 | 中国科学院西北生态环境资源研究院 | Anti-freezing and anti-thawing device |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2846852A (en) * | 1955-08-15 | 1958-08-12 | Horace Williams Company Inc W | Mud ring for the development of passive resistance in soft soils |
US3691776A (en) * | 1969-12-19 | 1972-09-19 | Raymond Int Inc | Expansive base pile construction |
SE9402147L (en) * | 1994-06-17 | 1995-12-18 | Geo Engineering Ab | Device and method for increasing the carrying capacity of the pile |
US6719496B1 (en) * | 1997-11-01 | 2004-04-13 | Shell Oil Company | ROV installed suction piles |
KR20040052779A (en) * | 2004-03-20 | 2004-06-23 | 윤 용 송 | Pile with an Extended Head and working method of the same |
CN100478525C (en) * | 2004-11-12 | 2009-04-15 | 丁锦良 | Composite pile foundation construction method |
US20070243063A1 (en) * | 2006-03-17 | 2007-10-18 | Schellstede Herman J | Offshore wind turbine structures and methods therefor |
US8506206B2 (en) * | 2010-10-08 | 2013-08-13 | 9267-9075 Quebec Inc. | Composite pile formed of interconnected rigid hollow tubes |
-
2014
- 2014-01-27 AU AU2014242367A patent/AU2014242367C1/en not_active Ceased
- 2014-01-27 BR BR112015018800A patent/BR112015018800A2/en not_active IP Right Cessation
- 2014-01-27 CA CA2900907A patent/CA2900907C/en not_active Expired - Fee Related
- 2014-01-27 SG SG11201506120RA patent/SG11201506120RA/en unknown
- 2014-01-27 EP EP14775464.2A patent/EP2971372B1/en not_active Not-in-force
- 2014-01-27 WO PCT/US2014/013227 patent/WO2014158334A1/en active Application Filing
- 2014-01-27 US US14/762,383 patent/US20160010303A1/en not_active Abandoned
- 2014-01-27 NZ NZ712647A patent/NZ712647A/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
NZ712647A (en) | 2016-07-29 |
CA2900907C (en) | 2017-09-05 |
AU2014242367A1 (en) | 2015-10-15 |
EP2971372B1 (en) | 2018-04-25 |
WO2014158334A1 (en) | 2014-10-02 |
SG11201506120RA (en) | 2015-09-29 |
US20160010303A1 (en) | 2016-01-14 |
AU2014242367C1 (en) | 2016-10-20 |
BR112015018800A2 (en) | 2017-07-18 |
CA2900907A1 (en) | 2014-10-02 |
AU2014242367B2 (en) | 2016-06-02 |
EP2971372A4 (en) | 2016-11-09 |
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