EP0020820A1 - Anchor pile hoisting device - Google Patents

Anchor pile hoisting device Download PDF

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Publication number
EP0020820A1
EP0020820A1 EP79200351A EP79200351A EP0020820A1 EP 0020820 A1 EP0020820 A1 EP 0020820A1 EP 79200351 A EP79200351 A EP 79200351A EP 79200351 A EP79200351 A EP 79200351A EP 0020820 A1 EP0020820 A1 EP 0020820A1
Authority
EP
European Patent Office
Prior art keywords
wire loop
pile
hoisting
anchor pile
wire
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
Application number
EP79200351A
Other languages
German (de)
French (fr)
Other versions
EP0020820B1 (en
Inventor
Thomas Jacobus Ruyter
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.)
Ballast Nedam NV
Amsterdamse Ballast Bagger En Grond (Amsterdam Ballast Dredging) BV
Scheepswerf en Machinefabriek De Liesbosch BV
Original Assignee
Amsterdamse Ballast Bagger En Grond (Amsterdam Ballast Dredging) BV
Scheepswerf en Machinefabriek De Liesbosch BV
Ballast Nedam Groep NV
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
Application filed by Amsterdamse Ballast Bagger En Grond (Amsterdam Ballast Dredging) BV, Scheepswerf en Machinefabriek De Liesbosch BV, Ballast Nedam Groep NV filed Critical Amsterdamse Ballast Bagger En Grond (Amsterdam Ballast Dredging) BV
Priority to DE7979200351T priority Critical patent/DE2965356D1/en
Priority to EP79200351A priority patent/EP0020820B1/en
Publication of EP0020820A1 publication Critical patent/EP0020820A1/en
Application granted granted Critical
Publication of EP0020820B1 publication Critical patent/EP0020820B1/en
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C1/00—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles
    • B66C1/10—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles by mechanical means
    • B66C1/12—Slings comprising chains, wires, ropes, or bands; Nets
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D9/00—Removing sheet piles bulkheads, piles, mould-pipes or other moulds or parts thereof
    • E02D9/02—Removing sheet piles bulkheads, piles, mould-pipes or other moulds or parts thereof by withdrawing
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/06—Floating substructures as supports
    • E02F9/062—Advancing equipment, e.g. spuds for floating dredgers

Definitions

  • the invention relates to an anchor pile hoisting device comprising.at least one hoisting cable co-operating with a wire loop wound around the anchor pile, said loop engaging the pile surface with sufficient friction, by being at an acute angle to a plane at right angles to the direction of the pile, under the influence of tractive force of the hoisting cable to loosen the pile from the ground and to subsequently hoist the same up.
  • the known device of the kind set forth comprises a wire loop which is pre-stretched in order to avoid elongation so that with the wire loop load to be expected the resultant lengthening of the wire loop and hence the wire loop angle can be kept within permissible limits.
  • the wire will nevertheless lengthen after prolonged use. Therefore, in order to avoid catastrophes the known wire loops are replaced at regular intervals.
  • the invention has for its object to enhance the lifetime of the wire loop, whilst the length of the wire loop and hence the wire loop angle are kept within the predetermined narrow limits.
  • the anchor pile hoisting device according to the invention is characterized by adjusting means for setting the effective length of the wire loop.
  • An anchor pile hoisting device in a preferred embodiment provides an improved guiding of the wire loop because the adjusting means comprise a stretching device journalled on a supporting ring surrounding the anchor pile.
  • a variant of the preferred anchor pile hoisting device is characterized in that the stretching device comprises at least one lifting screw.
  • the wire loop has a smaller structural height, because the wire loop only partly surrounds the pile.
  • the anchor pile hoisting device comprises an angle feeler arranged on the supporting ring and measuring the wire loop angle.
  • the stretching device comprises a leverage for adjusting the effective length during the hoisting operation.
  • Lifting of the anchor pile 6 is performed by means of an anchor pile hoisting device 31 as shown in Figure 14, comprising a lifting cylinder 2 standing on the floating body 1, a hoisting cable 3 passed around a disc 4 supported by the piston rod 27 of the lifting cylinder 2 and a wire loop 5 wound twice around the anchor pile 6, directly or indirect7y engaged by the hoisting cable 3.
  • the lifting force G' of the hoisting cable 3, which draws the wire loop 5 surrounding the anchor pile 6, produces in said wire loop 5 a stretching force K 1 , whilst an angle a 1 is formed between the wire loop 5 and the plane 7 at right angles to the axis 8 of the pile.
  • the component N normal to the pile axis 8 is G' cotan a.
  • the hoisting cable 3 is connected by means of a fastening pin 29 with a wire loop 5 wound twice around the anchor pile 6.
  • a stretching device 10 the wire loop 5 is automatically tightened until a sufficient lifting force G 1 is built up for drawing the pile 6.
  • the stretching device 10 comprises a wire eyelet 35 at one end 36 of the wire loop 5, through which the other end 37 of the wire .loop 5 is passed.
  • the stretching device 10 comprises a steel eyelet 38 fastened to one end 36 of the wire loop and having a curved wire guide 39 for the other end 37.
  • the anchor pile hoisting devices of Figures 6 to 15 have each a supporting ring 11 surrounding the pile 6 and suspended by means of a fastening pin 29 to the hoisting cable 3.
  • Figure 6 shows that the supporting ring 11 is arranged around the pile 6 on which one end 36 of the wire loop 5 is journalled by means of a wire fastener 12.
  • the effective length of the wire loop 5 is adjusted by means of a curved guide strip 13, which is fastened to the supporting ring 11.
  • Figures 7 to 10 illustrate a number of stretching devices adjustable in a different way.
  • the anchor pile hoisting device 31 according to the invention shown in Figure 7 comprises a stretching device 40 comprising an eccentric 14 rotatably journalled in the supporting ring 11 and fixable by means of a pin 41 in a hole selected from a plurality of holes 42.
  • a stretching device 40 comprising an eccentric 14 rotatably journalled in the supporting ring 11 and fixable by means of a pin 41 in a hole selected from a plurality of holes 42.
  • the anchor pile hoisting device comprises as a stretching device 40 a lifting screw 15, a nut 45 of which bearing on a console 44 fastened to the ring 11 engages a threaded rod 46, which is fastened to one end 36 of the wire loop 5, the other end 37 of which is fastened to a fixed pin (not shown) of the supporting ring 11.
  • Figure 10 differs from Figure 9 in that the lifting screw 15 is replaced by a pin 50 and a rod 48 having holes 49.
  • the pin 50 is inserted into the console 44 and into a selected one of the holes 49.
  • Figure 11 shows an improved wire loop 5 made from a flat, for example, braided belt 18.
  • Figures 12 and 13 show each a wire loop structure of small height b.
  • a single wire loop 20 partly surrounds the pile 6.
  • Figure 13 shows a plurality of wire loops 20 journalled on a divided guide ring 21, the two halves 51 of which are supported each by means of two hoisting cables 3.
  • the wire loops 20 are held at a distance from the guide ring 21 by spring stretchers 24, which provide the required distance and hence the required lifting force G'.
  • the effective length of the wire loop 20 is adjusted, as shown in Figures 13 and 13, by means of a hydraulic post- stretcher 56.

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  • Engineering & Computer Science (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)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Placing Or Removing Of Piles Or Sheet Piles, Or Accessories Thereof (AREA)

Abstract

In a anchor pile hoisting device, a hoisting cable (3) of which cooperates with a wire loop (5) wound around the anchor pile (6), the length of the wire loop is prescribed within narrow limits in order to prevent on the one hand slip of the wire loop with respect to the anchor pile (6) and on the other hand a too high tension in the wire loop (5).
In accordance with the invention the length of the wire loop (5) can be adjusted.

Description

  • The invention relates to an anchor pile hoisting device comprising.at least one hoisting cable co-operating with a wire loop wound around the anchor pile, said loop engaging the pile surface with sufficient friction, by being at an acute angle to a plane at right angles to the direction of the pile, under the influence of tractive force of the hoisting cable to loosen the pile from the ground and to subsequently hoist the same up.
  • Such a device is known. With the known type of anchor pile hoisting device hoisting or withdrawal of the anchor pile requires the extraction force to be transferrable to the pile. This is achieved by causing the wire loop to engage the pile wall with adequate frictional force. An extraction force in the hoisting cable equal to the sum of the adhesive force of the pile in the ground and the weight of the pile brings about an orthoganal force of the wire loop on the pile jacket which produces a lighter friction between the wire loop and the pile wall according as the angle between the wire loop and the plane at right angles to the pile is larger. With given dimensions and a given weight of the anchor pile and its adhesive force are thus associated a fixed length and section of the wire .and the wire loop angle. If the wire length increases, for example, due to elongation of the wire loop, the wire loop angle will also increase so that less friction will be produced and the wire loop may slip.
  • The known device of the kind set forth comprises a wire loop which is pre-stretched in order to avoid elongation so that with the wire loop load to be expected the resultant lengthening of the wire loop and hence the wire loop angle can be kept within permissible limits. However, in the rough dredging operations the wire will nevertheless lengthen after prolonged use. Therefore, in order to avoid catastrophes the known wire loops are replaced at regular intervals.
  • The invention has for its object to enhance the lifetime of the wire loop, whilst the length of the wire loop and hence the wire loop angle are kept within the predetermined narrow limits. To this end the anchor pile hoisting device according to the invention is characterized by adjusting means for setting the effective length of the wire loop.
  • An anchor pile hoisting device according to the invention in a preferred embodiment provides an improved guiding of the wire loop because the adjusting means comprise a stretching device journalled on a supporting ring surrounding the anchor pile.
  • A variant of the preferred anchor pile hoisting device is characterized in that the stretching device comprises at least one lifting screw.
  • In a further development of the anchor pile hoisting device according to the invention the wire loop has a smaller structural height, because the wire loop only partly surrounds the pile.
  • In order to permit of carrying out the post-adjustment operations in due time, a further development of the anchor pile hoisting device according to the invention comprises an angle feeler arranged on the supporting ring and measuring the wire loop angle.
  • In a still further developed embodiment of the anchor pile hoisting device according to the invention the stretching device comprises a leverage for adjusting the effective length during the hoisting operation.
  • The above-mentioned and further features of the invention will be described more fully hereinafter with reference to a drawing.
  • The drawing shows schematically in
    • Figures 1 to 3 each a play of forces for a wire loop engaging around a pile,
    • Figure 4 part of a suction dredger with an anchor pile hoisting device in accordance with the invention,
    • Figure 5 on an enlarged scale a detail V of Figure 4,
    • Figures.6,14 and 15 three variants of automatic stretching devices for further developments of the anchor pile hoisting device in accordance with the invention,
    • Figures 7,9,10,11,12 and 13 each a variant of the detail V of Figure 4 and
    • Figure 8 a side elevation of detail VIII of Figure 7.
  • A ground dredger 32 as shown in Figure 4, for example, a cutter head dredger, turns during operation around an anchor pile 6 lowered into the soil 9 and being movable up and down in guides 28 with respect to a floating body 1 on the water 33. Lifting of the anchor pile 6 is performed by means of an anchor pile hoisting device 31 as shown in Figure 14, comprising a lifting cylinder 2 standing on the floating body 1, a hoisting cable 3 passed around a disc 4 supported by the piston rod 27 of the lifting cylinder 2 and a wire loop 5 wound twice around the anchor pile 6, directly or indirect7y engaged by the hoisting cable 3. When the anchor pile 6 is lifted, the hoisting cable 3 draws the wire loop 5, which is thus drawn tightly around the anchor pile 6 and builds up a sufficient friction resistance w in order to overcome by a lifting force G' the sum of the weight G of the anchor pile 6 and the ground resistance Gg. Figures 1 to 3 illustrate this play of forces in a simplified manner.
  • Referring to Figure 1, the lifting force G' of the hoisting cable 3, which draws the wire loop 5 surrounding the anchor pile 6, produces in said wire loop 5 a stretching force K1, whilst an angle a1 is formed between the wire loop 5 and the plane 7 at right angles to the axis 8 of the pile.
  • The component N normal to the pile axis 8 is G' cotan a.
  • The frictional resistance w produced = f.N = f.G' cotan a.
  • Since the frictional resistance f between the wire loop 5 and the pile 6 is a constant, the cotan a and hence the angle a determine the lifting force G'.
  • From Figure 1 it will be apparent that in the case of a small angle a1 a heavy force N1 is exerted, which results in a heavy frictional resistance w1 so that a high lifting force G' is prevailing. With a small angle a1, however, the stretching force K1 is found to be comparatively high so that the wire loop 5 must be made from a thick and hence expensive cable.
  • Referring to Figure 2 the angle a2 appears to be chosen correctly, because it results in a reasonable stretching force K2' whilst because of G' being equal to f.N2 a sufficient lifting force is obtained.
  • The angle a3 of Figure 3 is too large and results in an inadequate lifting force G'.
  • In the simplest form illustrated in Figures 14 and 5 the hoisting cable 3 is connected by means of a fastening pin 29 with a wire loop 5 wound twice around the anchor pile 6. Through a stretching device 10 the wire loop 5 is automatically tightened until a sufficient lifting force G1 is built up for drawing the pile 6.
  • Referring to Figure 14 the stretching device 10 comprises a wire eyelet 35 at one end 36 of the wire loop 5, through which the other end 37 of the wire .loop 5 is passed. Referring to Figure 5 the stretching device 10 comprises a steel eyelet 38 fastened to one end 36 of the wire loop and having a curved wire guide 39 for the other end 37.
  • In principle it is even possible to make the hoisting cable 3 and the wire loop 5 from a single length of wire.
  • The anchor pile hoisting devices of Figures 6 to 15 have each a supporting ring 11 surrounding the pile 6 and suspended by means of a fastening pin 29 to the hoisting cable 3.
  • Figure 6 shows that the supporting ring 11 is arranged around the pile 6 on which one end 36 of the wire loop 5 is journalled by means of a wire fastener 12. The effective length of the wire loop 5 is adjusted by means of a curved guide strip 13, which is fastened to the supporting ring 11.
  • Figures 7 to 10 illustrate a number of stretching devices adjustable in a different way.
  • The anchor pile hoisting device 31 according to the invention shown in Figure 7 comprises a stretching device 40 comprising an eccentric 14 rotatably journalled in the supporting ring 11 and fixable by means of a pin 41 in a hole selected from a plurality of holes 42. By selecting the correct position among the plurality of eccentric positions the effective length of the wire loop 5 and hence the angle a can be adjusted to the required value. If due to elongation of the wire loop 5 the angle a becomes larger, the wire loop 5 comes into contact with the angle feeler 17, which indicates that the effective length of the wire loop has to be shortened by readjustment of the eccentric 14.
  • Referring to Figure 9 the anchor pile hoisting device according to the invention comprises as a stretching device 40 a lifting screw 15, a nut 45 of which bearing on a console 44 fastened to the ring 11 engages a threaded rod 46, which is fastened to one end 36 of the wire loop 5, the other end 37 of which is fastened to a fixed pin (not shown) of the supporting ring 11.
  • Figure 10 differs from Figure 9 in that the lifting screw 15 is replaced by a pin 50 and a rod 48 having holes 49. The pin 50 is inserted into the console 44 and into a selected one of the holes 49.
  • Figure 11 shows an improved wire loop 5 made from a flat, for example, braided belt 18.
  • Figures 12 and 13 show each a wire loop structure of small height b. As shown in Figure 12 a single wire loop 20 partly surrounds the pile 6. Figure 13 shows a plurality of wire loops 20 journalled on a divided guide ring 21, the two halves 51 of which are supported each by means of two hoisting cables 3. The wire loops 20 are held at a distance from the guide ring 21 by spring stretchers 24, which provide the required distance and hence the required lifting force G'. The effective length of the wire loop 20 is adjusted, as shown in Figures 13 and 13, by means of a hydraulic post- stretcher 56.
  • Figure 15 shows a stretching device 10, which automatically stretches the wire loop 5 by means of a lever 22 in accordance with the lifting force G'. The lever 22 is pivotally journalled on the support 11 by means of a pivot 57 and has a cam 23, to which is fastened an arcuate cable saddle 60. The end 36 of the wire loop 5 extends above the cable saddle 60 towards a fastening pin 61. The higher the lever 22 turns upwards with a heavier force, the shorter becomes the effective length of the wire loop 5 and the smaller becomes the angle a.

Claims (7)

1. An anchor pile hoisting device comprising at least one hoisting cable co-operating with a wire loop wound around the anchor pile and engaging the pile surface with adequate friction under the influence of the tractive force of the hoisting cable because of being at an acute angle to a plane normal to the longitudinal direction of the pile for loosening the pile from the ground and for subsequently hoisting the same up, characterized by adjusting means for setting the effective length of the wire loop.
2. A device as claimed in Claim 1 characterized in that the adjusting means comprise a stretching device journalled on a supporting ring surrounding the anchor pile.
3. A device as claimed in Claim 2 characterized in that the stretching device comprises at least one lifting screw.
4. A device as claimed in Claim 2 or 3 characterized in that in order to reduce the structural height of the loop around the pile the hoisting device comprises at least one wire loop post-adjustably connected with the ring and sur- irounding the pile only partly.
5. A device as claimed in Claim 2 or 3 characterized in that the stretching device comprises a leverage for adjusting the effective length during the hoisting operation.
6. A device as claimed in anyone of the preceding Claims characterized in that the wire loop is constructed in the form of a flat belt.
7. A device as claimed in anyone of Claims 2,3,5 or 6 characterized in that an angle feeler measuring the wire loop is arranged on the supporting ring.
EP79200351A 1979-06-29 1979-06-29 Anchor pile hoisting device Expired EP0020820B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE7979200351T DE2965356D1 (en) 1979-06-29 1979-06-29 Anchor pile hoisting device
EP79200351A EP0020820B1 (en) 1979-06-29 1979-06-29 Anchor pile hoisting device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP79200351A EP0020820B1 (en) 1979-06-29 1979-06-29 Anchor pile hoisting device

Publications (2)

Publication Number Publication Date
EP0020820A1 true EP0020820A1 (en) 1981-01-07
EP0020820B1 EP0020820B1 (en) 1983-05-11

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP79200351A Expired EP0020820B1 (en) 1979-06-29 1979-06-29 Anchor pile hoisting device

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EP (1) EP0020820B1 (en)
DE (1) DE2965356D1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1367020A2 (en) * 2002-05-31 2003-12-03 WYSSMANN, Max Device for holding and manipulating a preferably cylindrical body
CN101838988A (en) * 2010-05-10 2010-09-22 昆明捷程桩工有限责任公司 Comprehensive construction method for extracting anchor cable
CN118004876A (en) * 2024-04-08 2024-05-10 山东泰扬精密轴承制造有限公司 Large-scale bearing hoist device

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106436711A (en) * 2016-09-30 2017-02-22 中建三局集团有限公司 Novel anchor cable removing machine

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1470815A (en) * 1922-04-17 1923-10-16 Crozier Charles Sling
US1501888A (en) * 1921-03-28 1924-07-15 Peter C Reilly Apparatus for handling concrete pipes
US1912244A (en) * 1931-10-30 1933-05-30 Arundel Corp Pile puller clamp
FR932467A (en) * 1946-08-20 1948-03-23 Automatic release device for the rapid installation of poles using an operating crane
US2819923A (en) * 1955-08-17 1958-01-14 Anderson Doyle Suspension sling

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1501888A (en) * 1921-03-28 1924-07-15 Peter C Reilly Apparatus for handling concrete pipes
US1470815A (en) * 1922-04-17 1923-10-16 Crozier Charles Sling
US1912244A (en) * 1931-10-30 1933-05-30 Arundel Corp Pile puller clamp
FR932467A (en) * 1946-08-20 1948-03-23 Automatic release device for the rapid installation of poles using an operating crane
US2819923A (en) * 1955-08-17 1958-01-14 Anderson Doyle Suspension sling

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1367020A2 (en) * 2002-05-31 2003-12-03 WYSSMANN, Max Device for holding and manipulating a preferably cylindrical body
EP1367020A3 (en) * 2002-05-31 2006-06-21 WYSSMANN, Max Device for holding and manipulating a preferably cylindrical body
CN101838988A (en) * 2010-05-10 2010-09-22 昆明捷程桩工有限责任公司 Comprehensive construction method for extracting anchor cable
CN101838988B (en) * 2010-05-10 2012-07-11 昆明捷程桩工有限责任公司 Comprehensive construction method for extracting anchor cable
CN118004876A (en) * 2024-04-08 2024-05-10 山东泰扬精密轴承制造有限公司 Large-scale bearing hoist device

Also Published As

Publication number Publication date
EP0020820B1 (en) 1983-05-11
DE2965356D1 (en) 1983-06-16

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