EP3066264A1 - Pile cropping device - Google Patents

Pile cropping device

Info

Publication number
EP3066264A1
EP3066264A1 EP14790259.7A EP14790259A EP3066264A1 EP 3066264 A1 EP3066264 A1 EP 3066264A1 EP 14790259 A EP14790259 A EP 14790259A EP 3066264 A1 EP3066264 A1 EP 3066264A1
Authority
EP
European Patent Office
Prior art keywords
pile
point
jaw
tooth
cropping
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
EP14790259.7A
Other languages
German (de)
French (fr)
Other versions
EP3066264B1 (en
EP3066264B8 (en
Inventor
Simon Rodgers
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.)
Ashtead Plant Hire Co Ltd
Original Assignee
Astra Site Services Ltd
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 Astra Site Services Ltd filed Critical Astra Site Services Ltd
Publication of EP3066264A1 publication Critical patent/EP3066264A1/en
Publication of EP3066264B1 publication Critical patent/EP3066264B1/en
Application granted granted Critical
Publication of EP3066264B8 publication Critical patent/EP3066264B8/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • E02D9/005—Removing sheet piles bulkheads, piles, mould-pipes or other moulds or parts thereof removing the top of placed piles of sheet piles

Definitions

  • This invention relates generally to the cropping of concrete piles, used in the construction of buildings, after they have been cast in order to reveal the internal reinforced steel rods set within the concrete cladding. More specifically, although not exclusively, this invention relates to an improvement in apparatus used in the cropping of concrete clad piles to reveal the said internal reinforcement steel rods set within.
  • One type of foundation commonly used on areas of reclaimed land, is the well-known reinforced concrete pile.
  • Two types of reinforced concrete pile prevail, namely those cast in situ or otherwise, pre-cast.
  • Pre-cast concrete piles are made intentionally to protrude from the ground in which they are positioned to give satisfactory space for levelling to a required level. Levelling is done by cropping the top of the pile to a required height.
  • the concrete piles also contain steel reinforcing rods which need to be exposed in order that further building works can be structurally tied to the foundations. The need for these reinforcing rods mean that any cropping to the concrete needs to avoid severing the pile all the way through. Devices to crop need to fracture the concrete at a localised point and then remove the waste, or facilitate its removal to reveal a section of reinforcing rod.
  • Cropping devices are well known in the industry, such as that disclosed in EP0339261 , a device lowered over the concrete pile to a desired height and whose cutting teeth fracture the concrete.
  • This device and many like it, has hydraulically driven jaws that pivot about a point close to the body of the device. This drives the cutting teeth in a circular motion about said point.
  • the concrete piles to be cropped are of varying thicknesses, heights and tolerances; so any given cropping device ideally need to be able to crop a variety of concrete piles of varying size such as of varying thicknesses. If the pile is thicker than average, the jaws need to be wider whereby pressure is therefore applied in a downwards direction, i.e.
  • a second disadvantage of this is that the direction of applied hydraulic cutting force may not be parallel to the direction of the cutting teeth throughout the extent of their cutting engagement with the pile; this decreases the life span of the teeth which are consumable items.
  • the method that current cropping devices use to counteract this disadvantage is to lengthen the distance between the centre of rotation and the cutting teeth.
  • the problem with this is that the mechanical force decreases due to the pivot effect created between the pneumatic piston, the centre of rotation and the cutting tooth.
  • the current cropper design therefore makes a compromise between these disadvantages.
  • a pile cropping device comprising a body locatable around and/or in the region of a pile to be cropped, the body having one or more pile cropping teeth adapted, in use, to engage with and disengage from cladding and/or reinforcement of said pile, wherein at the point of engagement between the cropping tooth or teeth and the pile to be cropped, the planar orientation of the tooth or teeth relative to the axis of the pile remaining generally unaffected by variation in the thickness of said reinforcement and/or cladding to be cropped from the pile.
  • Preferred and optional features are to be found amongst the sub claims herewith.
  • the device for cropping concrete pile foundations comprises a body for receiving the exposed top of the concrete pile, means for attachment to lifting apparatus, at least one cutting tooth in a hydraulically powered jaw including a parallel linkage to maintain the position of the tooth generally parallel to a desired plane of fracture in the concrete pile.
  • the device for cropping concrete pile foundations comprises one cutting tooth for which there is provided a surface, oppositely located relative to the tooth to provide a contact point for the tooth to push upon when in operation.
  • the device for cropping concrete pile foundations comprises more than one cutting tooth in which an array of similar teeth and mountings therefor is arranged at even spacing around the body to provide even cutting or cropping power distribution into the concrete pile when in operation.
  • the device for cropping concrete piles comprises, a body, at least one hydraulically actuated jaw rotationally connected to a pivot point on the body, comprising at least one cutting tooth, the jaws of the pile cropping device containing a parallel linkage between a centre of rotation of the jaw, and a cutting tooth.
  • the pivot point on the body, rotationally connected to the jaw is rigidly connected to a second point, independent of the jaw, with the line that joins the two being parallel to a desired cutting plane, these two said points being rotationally connected to the cutting tooth by a central linkage and the jaw, the jaw being rotationally connected to the pivot point and to the front of the cutting tooth and the central linkage being rotationally connected to the said second point and to a point at the back of the cutting tooth.
  • Figure 1 is a side view of a pile cropping device
  • Figure 2 is a cross-section of the device in figure 1 ,
  • Figure 3 is an enlarged detail view of a jaw-tooth arrangement from figure 2
  • Figure 4 is an isometric view of another preferred embodiment
  • Figure 5 is a side view of the embodiment shown in figure 4
  • Figure 6 is a top view of the embodiment shown in figure 4
  • Figure 7 is a cross-section of the device in figure 5 in an open position
  • Figure 8 is a cross-section of the device in figure 5 in a closed position.
  • figure 1 is an image of one embodiment of the pile cropper device (1).
  • the figure shows the device from the side and shows the body of the cropper (1 1) rotationally connected to jaws (12) at a pivot point (15).
  • the jaws comprise of a jaw assembly (12) and cutting teeth (13).
  • the jaws are driven by hydraulic arms (14) and the internal parallel mechanism holds the tip of the teeth parallel to the desired plane of fracture of the concrete pile (not shown) and the rotation point (16) allows the tip to rotate.
  • the jaw assembly comprises outer plates (18) and support elements (17).
  • Figure 2 is a cross-sectional view of the device in figure 1 and shows the internal mechanism of the parallel linkage.
  • FIG. 3 shows a detail view of the jaw assembly (12) and demonstrates one form of preferred parallel linkage.
  • the top link (31) between the pivot point of the jaw (15) and the rotational connection (34) is, in this case, parallel to the plane of the desired fracture of the concrete pile.
  • the tooth (13) is held by the tooth linkage (32) which is held parallel to the top link (31) by the jaw assembly (12) and the rotating link (33).
  • the rotating link (33) between the rotational connection (34) at the top of the linkage and the rotational connection (35) at the bottom of the linkage is rotationally connected to both the top linkage (31) and the tooth linkage (32). This causes the tooth to remain parallel when the jaw actuates.
  • Figure 4 shows another embodiment of the invention, the figure shows the body of the cropper (41) rotationally connected to jaws (42) at a pivot point (45).
  • the jaws comprise of a jaw assembly (42) and cutting teeth (43).
  • the jaws are driven by hydraulic arms (44) and the internal parallel mechanism holds the tip of the teeth parallel to the desired plane of fracture of the concrete pile (not shown),
  • Figure 5 shows the cropping device of figure 4 from a side view. The cropper is in its open position.
  • Figure 6 shows the cropping device of figure 4 from the top. The cropper is in its open position.
  • Figure 7 shows a cross-section of the cropping device of figure 5 and demonstrates the internal parallel mechanism for this embodiment.
  • the jaw assembly (42) contains a similar arrangement of linkages as figure 2, however, the top linkage (71) connects the pivot point (74) directly to the body of the device.
  • the top linkage (71) positions centre of the pivot point (74) onto the same plane as the centre of the jaw pivot point (45).
  • Figure 8 shows the same cross-section of the apparatus as figure 7 but it is in a closed position and demonstrates the way with which the parallel mechanism causes the tooth to remain parallel.
  • the principal advantage of devices according to this invention result from maintaining the orientation of the tooth relative to the pile to be, or being, cropped generally constant throughout its engagement with the pile, its cladding or its projecting reinforcement as the pile reduces in thickness by removal of a portion of mainly the concrete surround.
  • This advantage follows through in the ability to deal similarly with piles of different thickness.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (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

A pile cropping device comprising a body locatable around and/or in the region of a pile to be cropped, the body having one or more pile cropping teeth adapted, in use, to engage with and disengage from cladding and/or reinforcement of said pile, wherein at the point of engagement between the cropping tooth or teeth and the pile to be cropped, the planar orientation of the tooth or teeth relative to the axis of the pile remaining generally unaffected by variation in the thickness of said reinforcement and/or cladding to be cropped from the pile.

Description

PILE CROPPING DEVICE
This invention relates generally to the cropping of concrete piles, used in the construction of buildings, after they have been cast in order to reveal the internal reinforced steel rods set within the concrete cladding. More specifically, although not exclusively, this invention relates to an improvement in apparatus used in the cropping of concrete clad piles to reveal the said internal reinforcement steel rods set within.
In the erection of modern buildings, there is a requirement for the use of foundations. One type of foundation, commonly used on areas of reclaimed land, is the well-known reinforced concrete pile. Two types of reinforced concrete pile prevail, namely those cast in situ or otherwise, pre-cast. Pre-cast concrete piles are made intentionally to protrude from the ground in which they are positioned to give satisfactory space for levelling to a required level. Levelling is done by cropping the top of the pile to a required height. The concrete piles also contain steel reinforcing rods which need to be exposed in order that further building works can be structurally tied to the foundations. The need for these reinforcing rods mean that any cropping to the concrete needs to avoid severing the pile all the way through. Devices to crop need to fracture the concrete at a localised point and then remove the waste, or facilitate its removal to reveal a section of reinforcing rod.
Cropping devices are well known in the industry, such as that disclosed in EP0339261 , a device lowered over the concrete pile to a desired height and whose cutting teeth fracture the concrete. This device, and many like it, has hydraulically driven jaws that pivot about a point close to the body of the device. This drives the cutting teeth in a circular motion about said point. The concrete piles to be cropped, however, are of varying thicknesses, heights and tolerances; so any given cropping device ideally need to be able to crop a variety of concrete piles of varying size such as of varying thicknesses. If the pile is thicker than average, the jaws need to be wider whereby pressure is therefore applied in a downwards direction, i.e. at an acute angle with respect to a normal plane horizontal with respect to the vertical axis of the pile. If the pile is thinner than average, the jaws need to be narrower and the hydraulic pressure applied to the cutting teeth will be upwards i.e. at an acute angle with respect to a normal plane horizontal with respect to the vertical axis of the pile. The current cropping devices only work at their optimum efficiency with concrete piles of average thickness with very little tolerance thicker or thinner. A disadvantage of this type of known system is that the pressure from the cutting teeth may be applied at an angle not parallel to the required fracture through the concrete, therefore wasting power. A second disadvantage of this is that the direction of applied hydraulic cutting force may not be parallel to the direction of the cutting teeth throughout the extent of their cutting engagement with the pile; this decreases the life span of the teeth which are consumable items. The method that current cropping devices use to counteract this disadvantage is to lengthen the distance between the centre of rotation and the cutting teeth. The problem with this is that the mechanical force decreases due to the pivot effect created between the pneumatic piston, the centre of rotation and the cutting tooth. The current cropper design therefore makes a compromise between these disadvantages.
It is an object of this invention to provide a pile cropping device wherein power applied by the cutting teeth remains substantially parallel to the desired plane of fracture in the concrete pile. It is another object to provide a pile cropping which allows utilisation of the pivot effect inherent in a typical pile cropping system to utilise the hydraulic more economically. It is yet another object to provide a pile cropping device that directs a cutting force generally parallel to the position of the cutting teeth and independently of the thickness of the pile to be cropped to optimise integrity and longevity of each tooth.
According to the present invention, there is provided a pile cropping device comprising a body locatable around and/or in the region of a pile to be cropped, the body having one or more pile cropping teeth adapted, in use, to engage with and disengage from cladding and/or reinforcement of said pile, wherein at the point of engagement between the cropping tooth or teeth and the pile to be cropped, the planar orientation of the tooth or teeth relative to the axis of the pile remaining generally unaffected by variation in the thickness of said reinforcement and/or cladding to be cropped from the pile. Preferred and optional features are to be found amongst the sub claims herewith.
In one embodiment the device for cropping concrete pile foundations comprises a body for receiving the exposed top of the concrete pile, means for attachment to lifting apparatus, at least one cutting tooth in a hydraulically powered jaw including a parallel linkage to maintain the position of the tooth generally parallel to a desired plane of fracture in the concrete pile.
In a second embodiment, the device for cropping concrete pile foundations comprises one cutting tooth for which there is provided a surface, oppositely located relative to the tooth to provide a contact point for the tooth to push upon when in operation. In a third embodiment, the device for cropping concrete pile foundations comprises more than one cutting tooth in which an array of similar teeth and mountings therefor is arranged at even spacing around the body to provide even cutting or cropping power distribution into the concrete pile when in operation.
In a still further embodiment of the invention, the device for cropping concrete piles comprises, a body, at least one hydraulically actuated jaw rotationally connected to a pivot point on the body, comprising at least one cutting tooth, the jaws of the pile cropping device containing a parallel linkage between a centre of rotation of the jaw, and a cutting tooth. The pivot point on the body, rotationally connected to the jaw, is rigidly connected to a second point, independent of the jaw, with the line that joins the two being parallel to a desired cutting plane, these two said points being rotationally connected to the cutting tooth by a central linkage and the jaw, the jaw being rotationally connected to the pivot point and to the front of the cutting tooth and the central linkage being rotationally connected to the said second point and to a point at the back of the cutting tooth. The distance between the said second point and said point at the back of the cutting tooth being the same as the distance between the centre of rotation and the point it is connected to at the front of the cutting tooth, the distance between the centre of rotation and the said second point being the same as the distance between the point at the front of the tooth and the point at the back of the tooth. These dimensional qualities hold the cutting tooth parallel to the desired cutting plane and therefore meet the requirements of the non-exclusive objects of this invention.
In order that the invention may be illustrated, more easily appreciated, and readily carried into effect by those skilled in the art, embodiments of the invention will now be described by way of example only with reference to the accompanying drawings in which:
Figure 1 is a side view of a pile cropping device, Figure 2 is a cross-section of the device in figure 1 ,
Figure 3 is an enlarged detail view of a jaw-tooth arrangement from figure 2, Figure 4 is an isometric view of another preferred embodiment, Figure 5 is a side view of the embodiment shown in figure 4, Figure 6 is a top view of the embodiment shown in figure 4, Figure 7 is a cross-section of the device in figure 5 in an open position, and
Figure 8 is a cross-section of the device in figure 5 in a closed position.
Referring to the drawings, figure 1 is an image of one embodiment of the pile cropper device (1). The figure shows the device from the side and shows the body of the cropper (1 1) rotationally connected to jaws (12) at a pivot point (15). The jaws comprise of a jaw assembly (12) and cutting teeth (13). The jaws are driven by hydraulic arms (14) and the internal parallel mechanism holds the tip of the teeth parallel to the desired plane of fracture of the concrete pile (not shown) and the rotation point (16) allows the tip to rotate. The jaw assembly comprises outer plates (18) and support elements (17).
Figure 2 is a cross-sectional view of the device in figure 1 and shows the internal mechanism of the parallel linkage.
Figure 3 shows a detail view of the jaw assembly (12) and demonstrates one form of preferred parallel linkage. The top link (31) between the pivot point of the jaw (15) and the rotational connection (34) is, in this case, parallel to the plane of the desired fracture of the concrete pile. The tooth (13) is held by the tooth linkage (32) which is held parallel to the top link (31) by the jaw assembly (12) and the rotating link (33). The rotating link (33) between the rotational connection (34) at the top of the linkage and the rotational connection (35) at the bottom of the linkage is rotationally connected to both the top linkage (31) and the tooth linkage (32). This causes the tooth to remain parallel when the jaw actuates.
Figure 4 shows another embodiment of the invention, the figure shows the body of the cropper (41) rotationally connected to jaws (42) at a pivot point (45). The jaws comprise of a jaw assembly (42) and cutting teeth (43). The jaws are driven by hydraulic arms (44) and the internal parallel mechanism holds the tip of the teeth parallel to the desired plane of fracture of the concrete pile (not shown),
Figure 5 shows the cropping device of figure 4 from a side view. The cropper is in its open position.
Figure 6 shows the cropping device of figure 4 from the top. The cropper is in its open position.
Figure 7 shows a cross-section of the cropping device of figure 5 and demonstrates the internal parallel mechanism for this embodiment. The jaw assembly (42) contains a similar arrangement of linkages as figure 2, however, the top linkage (71) connects the pivot point (74) directly to the body of the device. The top linkage (71) positions centre of the pivot point (74) onto the same plane as the centre of the jaw pivot point (45).
Figure 8 shows the same cross-section of the apparatus as figure 7 but it is in a closed position and demonstrates the way with which the parallel mechanism causes the tooth to remain parallel.
The principal advantage of devices according to this invention result from maintaining the orientation of the tooth relative to the pile to be, or being, cropped generally constant throughout its engagement with the pile, its cladding or its projecting reinforcement as the pile reduces in thickness by removal of a portion of mainly the concrete surround. This advantage follows through in the ability to deal similarly with piles of different thickness. By so aligning the plane of cutting teeth to the axis of the pile and keeping that generally constant maximises the efficiency of the cutting/cropping operations, reduces power consumption and optimises replaceable teeth longevity.

Claims

1. A pile cropping device comprising a body locatable around and/or in the region of a pile to be cropped, the body having one or more pile cropping teeth adapted, in use, to engage with and disengage from cladding and/or reinforcement of said pile, wherein at the point of engagement between the cropping tooth or teeth and the pile to be cropped, the planar orientation of the tooth or teeth relative to the axis of the pile remaining generally unaffected by variation in the thickness of said reinforcement and/or cladding to be cropped from the pile.
2. A device as claimed in claim 1 , in which the said planar orientation of the tooth or teeth remains generally constant over a range of its movement, in use, from engagement with the said cladding and/or reinforcement to disengagement therefrom.
3. A device as claimed in any preceding claim, wherein the said planar orientation remains generally constant and is independent of the thickness of the pile to be cropped.
4. A device as claimed in any preceding claim, in which a jaw is provided and mounted for powered movement by hydraulic ram, and which jaw comprises more than three pivot points for movable components of the device.
5. A device as claimed in claim 4 in which there are provided five such pivot points.
6. A device as claimed in any preceding claim in which the body is associated with an extension arm which includes a pivot point at or in the region of its extremity spaced from the said body, for a movable component of the device.
7. A device as claimed in any preceding claim, in which the or each cutting tooth is provided with two spaced apart pivot points for pivotal mounting to the said body.
8. A device as claimed in any preceding claim, comprising at least one hydraulically actuated jaw rotationally connected to a pivot point on the body, the device provided with jaws which are adapted to operate with a parallel linkage between a centre of rotation of the jaw, and a cutting tooth.
9. A device as claimed in any preceding claim wherein a pivot point on the body, rotationally connected to a jaw is rigidly connected to a second point, independent of the jaw, a notional line that joins the two points being parallel to a desired cutting plane, said two points being rotationally connected to a cutting tooth by a central linkage and the jaw, the jaw being rotationally connected to the pivot point and to the front of the cutting tooth, and the central linkage being rotationally connected from the said second point to a secondary pivot point of the cutting tooth.
10. A device according to claim 9 wherein the distance between the said second point and said secondary pivot point of the cutting tooth is the same as the distance between the centre of rotation and the point to which it is connected at a primary pivot point of the cutting tooth, the distance between the centre of rotation and the said second point being the same as the distance between the primary and secondary pivot points of the cutting tooth.
EP14790259.7A 2013-10-21 2014-10-16 Pile cropper Active EP3066264B8 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB1318599.6A GB2519380B (en) 2013-10-21 2013-10-21 Pile cropping device
PCT/GB2014/053108 WO2015059451A1 (en) 2013-10-21 2014-10-16 Pile cropping device

Publications (3)

Publication Number Publication Date
EP3066264A1 true EP3066264A1 (en) 2016-09-14
EP3066264B1 EP3066264B1 (en) 2018-10-03
EP3066264B8 EP3066264B8 (en) 2019-05-29

Family

ID=49727113

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14790259.7A Active EP3066264B8 (en) 2013-10-21 2014-10-16 Pile cropper

Country Status (3)

Country Link
EP (1) EP3066264B8 (en)
GB (1) GB2519380B (en)
WO (1) WO2015059451A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104912077A (en) * 2015-06-29 2015-09-16 上海胜真珊机械科技有限公司 Full-automatic hydraulic pile cutting machine
US11408140B2 (en) 2016-03-18 2022-08-09 Creative Crushers Ltd Pile croppers and methods for cutting piles
RU198971U1 (en) * 2019-12-04 2020-08-05 Федеральное государственное бюджетное образовательное учреждение высшего образования "Ярославский государственный технический университет" ФГБОУВО "ЯГТУ" Device for cutting reinforced concrete piles

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1394355A (en) * 1972-08-25 1975-05-14 Japan National Railway Crusher head for breaking concrete structures
DE3618191A1 (en) * 1986-05-30 1987-12-03 Michael Barnsteiner CONCRETE CRUSHERS
DE58903074D1 (en) 1988-04-27 1993-02-04 Diaber Ag DEVICE FOR UNLOCKING THE REINFORCING IRON OF CONCRETE Piles.
JP2540210B2 (en) * 1989-06-19 1996-10-02 株式会社坂戸工作所 Crushing machine
DE19812454C1 (en) * 1998-03-23 1999-07-22 Darda Systemtechnik Gmbh Concrete breaker tool head
GB9822265D0 (en) * 1998-10-14 1998-12-09 Roxbury Ltd Improvements in or relating to pile cutters
IT1310857B1 (en) * 1999-10-18 2002-02-22 Mantovanibenne S R L DEVICE FOR THE SPACKING OF POLES
CN201400892Y (en) * 2009-02-27 2010-02-10 荣成市龙河金属加工厂 Hydraulic pile head crushing device
CN101487259A (en) * 2009-02-27 2009-07-22 荣成市龙河金属加工厂 Hydraulic pile head breaker
GB2470364A (en) * 2009-05-19 2010-11-24 Michael J Williams Hydraulic tool to crush above ground extension of a concrete pile.

Also Published As

Publication number Publication date
WO2015059451A1 (en) 2015-04-30
GB2519380B (en) 2015-12-23
EP3066264B1 (en) 2018-10-03
EP3066264B8 (en) 2019-05-29
GB2519380A (en) 2015-04-22
GB201318599D0 (en) 2013-12-04

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