EP0020820B1 - Anchor pile hoisting device - Google Patents
Anchor pile hoisting device Download PDFInfo
- Publication number
- EP0020820B1 EP0020820B1 EP79200351A EP79200351A EP0020820B1 EP 0020820 B1 EP0020820 B1 EP 0020820B1 EP 79200351 A EP79200351 A EP 79200351A EP 79200351 A EP79200351 A EP 79200351A EP 0020820 B1 EP0020820 B1 EP 0020820B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- wire loop
- pile
- ring
- supporting ring
- hoisting
- 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.)
- Expired
Links
- 230000001154 acute effect Effects 0.000 claims description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
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, a supporting ring attached to the lower end of said cable or cables, said ring having a passage adapted for slidably receiving a pile, said ring at least substantially surrounding said passage, at least one wire loop connected at each end to said supporting ring, the or each wire loop in use frictionally engaging the pile surface and forming an acute angle (a) with a plane extending perpendicularly to the sliding direction of said ring.
- the known device of the kind set forth comprises a wire loop which is pre-tensioned 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 adjustment means acting between the supporting ring and wire loop to set the effective length of the or each wire loop.
- US-A-1 501 888 discloses a hoisting device for handling concrete pipes mainly consisting of a sling surrounding the pipe to be handled.
- Said sling is constituted by a ring part, which in combination with a hoisting chain part constitutes a closed loop, having a non-predetermined length. Due to the non-predetermined length, the acute angle between the loop and the plane extending perpendicularly to the pipe is not predetermined resulting in a non-predetermined tension in the loop and a non-predetermined friction.
- the loops of the hoisting devices of FR-A-932 467, US-A-2 819 923 and US-A-1 912 244 also each have a non-predetermined length.
- the adjustment means of a preferred embodiment of an anchor pile hoisting device according to the invention comprise tensioning means which may consist of a simple 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 tensioning device comprises a leverage for adjusting the effective length during the hoisting operation.
- Lifting the anchor pile 6 is performed by means of an anchor pile hoisting device 31, comprising a lifting cylinder 2 standing on the floating body 1, a hoisting cable 3 passed around a pulley 4 supported by the piston rod of the lifting cylinder 2, a supporting ring 11 and a wire loop 5 wound twice around the anchor pile 6, said ring 11 being directly or indirectly attached to the hoisting cable 3.
- the component N normal to the pife axis 8 is G' cotan a.
- the anchor pile hoisting device of Figure 5 has a supporting ring 11 surrounding the pile 6 and suspended by means of a fastening pin 29 to the hoisting cable 3.
- Figure 5 shows that the supporting ring 11 is arranged around the pile 6.
- One end 18 of the wire loop 5 is journalled by means of a wire fastener 12 as shown in Figure 11.
- the effective length of the wire loop 5 is adjusted by means of adjustment means which is fastened to the supporting ring 11.
- Figure 5 shows a tensioning means 10, which automatically tensions 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 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.
- 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 tensioning 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 tensioning 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 tensioning device 40 a screw device 15 comprising a nut 45 bearing on a console 44 fastened to the ring 11 and received on 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) on the supporting ring 11.
- Figure 10 differs from Figure 9 in that the screw device 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 6 show each a wire loop structure of small height b.
- a single wire loop 20 partly surrounds the pile 6.
- Figure 6 shows a plurality of wire loops 20 journalled on a divided support 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 12 and 6, by means of a hydraulic post-tensioner 56.
Landscapes
- 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)
Description
- The invention relates to an anchor pile hoisting device comprising at least one hoisting cable, a supporting ring attached to the lower end of said cable or cables, said ring having a passage adapted for slidably receiving a pile, said ring at least substantially surrounding said passage, at least one wire loop connected at each end to said supporting ring, the or each wire loop in use frictionally engaging the pile surface and forming an acute angle (a) with a plane extending perpendicularly to the sliding direction of said ring.
- Such a device is known. The loop ends each engage a pin fixed to the ring. 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 orthogonal force of the wire loop on the pile jacket which produces a lighter friction between the wire loop and the pile wall as the angle between the wire loop and the plane at right angles to the pile becomes 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-tensioned 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 adjustment means acting between the supporting ring and wire loop to set the effective length of the or each wire loop.
- US-A-1 501 888 discloses a hoisting device for handling concrete pipes mainly consisting of a sling surrounding the pipe to be handled. Said sling is constituted by a ring part, which in combination with a hoisting chain part constitutes a closed loop, having a non-predetermined length. Due to the non-predetermined length, the acute angle between the loop and the plane extending perpendicularly to the pipe is not predetermined resulting in a non-predetermined tension in the loop and a non-predetermined friction.
- The loops of the hoisting devices of FR-A-932 467, US-A-2 819 923 and US-A-1 912 244 also each have a non-predetermined length.
- The adjustment means of a preferred embodiment of an anchor pile hoisting device according to the invention comprise tensioning means which may consist of a simple 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 tensioning 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, 7, 9, 10, 11 and 12 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 ananchor pile 6 lowered into thesoil 9 and being movable up and down inguides 28 with respect to a floatingbody 1 on thewater 33. Lifting theanchor pile 6 is performed by means of an anchorpile hoisting device 31, comprising a liftingcylinder 2 standing on the floatingbody 1, a hoistingcable 3 passed around a pulley 4 supported by the piston rod of thelifting cylinder 2, a supportingring 11 and awire loop 5 wound twice around theanchor pile 6, saidring 11 being directly or indirectly attached to the hoistingcable 3. When theanchor pile 6 is lifted, the hoistingcable 3 draws thewire loop 5, which is thus drawn tightly around theanchor pile 6 and builds up a sufficient frictional resistance w in order to overcome by a lifting force G' the sum of the weight G of theanchor 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 thewire loop 5 .surrounding theanchor pile 6, produces in said wire loop 5 a tensioning force K,, whilst an angle a1 is formed between thewire loop 5 and theplane 7 extending perpendicularly to theaxis 8 of the pile, and so perpendicularly to the sliding direction ofsaid ring 11. - The component N normal to the
pife 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 thepile 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 case of a small angle a1 a heavy force N, 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 tensioning force K, 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 tension 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'.
- The anchor pile hoisting device of Figure 5 has a supporting
ring 11 surrounding thepile 6 and suspended by means of a fasteningpin 29 to the hoistingcable 3. - Figure 5 shows that the supporting
ring 11 is arranged around thepile 6. Oneend 18 of thewire loop 5 is journalled by means of a wire fastener 12 as shown in Figure 11. The effective length of thewire loop 5 is adjusted by means of adjustment means which is fastened to the supportingring 11. - Figure 5 shows a tensioning means 10, which automatically tensions the
wire loop 5 by means of a lever 22 in accordance with the lifting force G'. The lever 22 is pivotally journalled on thesupport 11 by means of apivot 57 and has acam 23, to which is fastened anarcuate cable saddle 60. Theend 36 of thewire loop 5 extends above thecable saddle 60 towards a fasteningpin 61. The higher lever 22 turns upwards with a heavier force, the shorter becomes the effective length of thewire loop 5 and the smaller becomes the angle a. - 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 atensioning device 40 comprising an eccentric 14 rotatably journalled in the supportingring 11 and fixable by means of apin 41 in a hole selected from a plurality ofholes 42. By selecting the correct position among the plurality of eccentric positions the effective length of thewire loop 5 and hence the angle a can be adjusted to the required value. If due to elongation of thewire loop 5 the angle a becomes larger, thewire loop 5 comes into contact with theangle 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 tensioning device 40 a
screw device 15 comprising anut 45 bearing on aconsole 44 fastened to thering 11 and received on a threadedrod 46, which is fastened to oneend 36 of thewire loop 5, the other end 37 of which is fastened to a fixed pin (not shown) on the supportingring 11. - Figure 10 differs from Figure 9 in that the
screw device 15 is replaced by apin 50 and arod 48 havingholes 49. Thepin 50 is inserted into theconsole 44 and into a selected one of theholes 49. - Figure 11 shows an improved
wire loop 5 made from a flat, for example, braidedbelt 18. - Figures 12 and 6 show each a wire loop structure of small height b. As shown in Figure 12 a
single wire loop 20 partly surrounds thepile 6. Figure 6 shows a plurality ofwire loops 20 journalled on a dividedsupport ring 21, the twohalves 51 of which are supported each by means of two hoistingcables 3. Thewire loops 20 are held at a distance from theguide ring 21 byspring stretchers 24, which provide the required distance and hence the required lifting force G'. The effective length of thewire loop 20 is adjusted, as shown in Figures 12 and 6, by means of ahydraulic post-tensioner 56.
Claims (8)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP79200351A EP0020820B1 (en) | 1979-06-29 | 1979-06-29 | Anchor pile hoisting device |
DE7979200351T DE2965356D1 (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 EP0020820A1 (en) | 1981-01-07 |
EP0020820B1 true EP0020820B1 (en) | 1983-05-11 |
Family
ID=8186292
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP79200351A Expired EP0020820B1 (en) | 1979-06-29 | 1979-06-29 | Anchor pile hoisting device |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0020820B1 (en) |
DE (1) | DE2965356D1 (en) |
Cited By (1)
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 |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10224103B4 (en) * | 2002-05-31 | 2010-07-15 | Max Wyssmann | Device for holding and moving a preferably cylindrical body |
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 |
CN118004876B (en) * | 2024-04-08 | 2024-06-14 | 山东泰扬精密轴承制造有限公司 | Large-scale bearing hoist device |
Family Cites Families (5)
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 |
-
1979
- 1979-06-29 EP EP79200351A patent/EP0020820B1/en not_active Expired
- 1979-06-29 DE DE7979200351T patent/DE2965356D1/en not_active Expired
Cited By (1)
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 |
Also Published As
Publication number | Publication date |
---|---|
EP0020820A1 (en) | 1981-01-07 |
DE2965356D1 (en) | 1983-06-16 |
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