EP0857830B1 - Installation for extracting objects driven in with a piling rig - Google Patents
Installation for extracting objects driven in with a piling rig Download PDFInfo
- Publication number
- EP0857830B1 EP0857830B1 EP19980200418 EP98200418A EP0857830B1 EP 0857830 B1 EP0857830 B1 EP 0857830B1 EP 19980200418 EP19980200418 EP 19980200418 EP 98200418 A EP98200418 A EP 98200418A EP 0857830 B1 EP0857830 B1 EP 0857830B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cable
- striking
- installation according
- cables
- outer contour
- 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 - Lifetime
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D11/00—Methods or apparatus specially adapted for both placing and removing sheet pile bulkheads, piles, or mould-pipes
Definitions
- the invention is related to an installation for extracting from the ground a slender object, such as a pipe, pile or sheet pile section, which has been driven into said ground, which installation comprises a hammer device with a ram, drive means for moving the ram, striking means which have a striking face, oriented towards the slender object, for receiving blows originating from the ram brought into movement by the drive means, and a pulling construction by means of which the striking means can be connected to the slender object, which pulling construction comprises cable means in loop form which at their one end interact with the striking means and at their other end can be brought into interaction with the slender object, wherein the cable means comprise at least two cables, each of which has been shaped to give a cable loop.
- the object of the invention is to provide an installation of the type described before which is of a simpler design. This object is achieved in that each loop consists of two straight, essentially parallel, parts and two curved parts, which extend over a bend of essentially 180°, and in that the cable means of the pulling construction comprises cables of a thickness which is between 25 and 200 mm.
- the connection to the striking means and the object can be constructed such that, on the one hand, the beneficial effects on the functioning of the installation, which have been described above, are obtained and, on the other hand, a reliable and uniform transmission of force is ensured, even under the high dynamic loads.
- the loop form provides the cable means with the ability to adapt to the connections to the striking means and the object in such a way that non-uniform loads can be avoided.
- the cable means can comprise two steel cables, each of which has been shaped to give a cable loop consisting of two straight, essentially parallel, parts and two curved parts, which extend over a bend of essentially 180°.
- the ends of each steel cable can be joined to one another by means of one or more sleeve clamps.
- a cable shoe which fits closely around the cable can be incorporated in each of the curved parts.
- the cable shoes enable the loop to adjust such that both parts are subjected to equal loads.
- the cable shoes provide the curved parts of the cable with lateral support, so that the cable cannot be pulled flat at these locations under the high impact loads.
- each cable shoe has an essentially U-shaped outer contour and the curved parts of a cable loop are held in place by means of securing means, such as pins or bolts which extend between the two arms of the U-shaped outer contour.
- securing means such as pins or bolts which extend between the two arms of the U-shaped outer contour.
- Each cable loop can have a striking shoe, which has an essentially flat striking face on that side thereof which faces away from the U-shaped outer contour.
- the bottom of the U-shaped outer contour of each striking shoe is essentially coincident with part of an imaginary circle, whilst the striking face of the striking shoe is located between the mid point of said imaginary circle and the bottom of the outer contour.
- the distance from the striking face to the bottom of the U-shaped outer contour, measured perpendicular to the striking face, is preferably less than or equal to the radius of said imaginary circle.
- the distance from the striking face to the bottom of the U-shaped cross-section can be greater than 60 % of the radius of said imaginary circle.
- the striking face is defined by a plateau which on either side adjoins recessed parts which extend as far as the outer contour of the striking shoe.
- each cable loop has a pile shoe which can be brought into interaction with a pile or tube, which pile shoes each have a bearing surface on that side thereof which faces away from the outer contour, which bearing surface can be brought into interaction with a supporting lug provided on the pile or tube.
- the ram together with drive means, is incorporated in a frame which is provided at the bottom with a driving cap and is guided along a leader of a mobile piling rig, in such a way that the frame with its driving cap can be positioned on the slim object, and the cable means in loop form extend from the slim object along the frame and the striking shoes are located in the path of the ram, which striking shoes are suspended from the hoisting means of the piling rig.
- the installation is found to function well if the thickness of the steel cables is between 25 and 120 mm, in particular between 50 and 120 mm. Too much rotation of the striking shoes about a vertical axis during operation, which can lead to the ram impinging incorrectly on the striking face of the striking shoe and to the cable and/or the piling rig being damaged, can be prevented by using rotation-free steel cables.
- the cables in the installation can also be made up from synthetically produced threads or yarns, such as those produced from a polyamide, polyethene, polyester, polypropene or carbon or from combinations thereof.
- the thickness of this type of cables is between 50 and 200 mm, preferably between 100 and 170 mm.
- FIG. 1 The installation shown in Figure 1 comprises a mobile piling rig, which is indicated in its entirety by 1, provided with a mobile chassis 2 fitted with caterpillar tracks, as well as a cab 3 rotatably mounted thereon.
- a column 6 is fixed to said cab 3 in an adjustable manner by means of hydraulic cylinder-piston device 4 and 5. Both column 6 and the chassis 2 are supported on a substrate which, for example, consists of planks 7.
- a leader 8 is mounted on the column 6, along which leader the frame 9, which is to be described in more detail, is slidable by means of claws 10.
- the tube 11 can either be driven in or extracted from the ground 12.
- Said tube 11 is provided at its top with a head 13 with fill opening 14 for pouring a concrete pile into the work.
- the frame 9 is positioned on the top end of the tube 11, as can also be seen in Figures 2 and 3.
- the contour of the frame 9 is indicated diagrammatically by dash-and-dot lines.
- One of the two main uprights 15 of said frame is also shown.
- a hydraulic cylinder-piston device 16 together with the associated accumulator installation 17 and hydraulic lines 18, is fixed close to the top of said uprights 15.
- the ram or falling weight 20 is fixed to the piston rod 19 of the hydraulic cylinder-piston device 16.
- the ram 20 according to the invention can be used in two ways. According to a first possibility, in which it is used as a an impact pile-driving ram, the ram 20 is moved upward by means of the hydraulic cylinder-piston device and is then released such that the nose 21 of the ram 20 is able to inflict blows on the driving cap 22 which has been placed on the top of the tube 11. In this case the installation according to the invention is functioning as an impact device driver inserting piles.
- the ram can be used to extract a driven-in tube 11 from the ground.
- the installation is equipped with two cable loops or grommets 23.
- Pile shoes 28 are fixed at the lower curved portion and striking shoes 29 are fixed at the upper curved portion.
- the pile shoes 28 and the striking shoes 29 possess an outward-facing essentially U-shaped slot which extends over an 180° bend.
- a striking shoe 29, the bottom of which is indicated by 30, is shown in Figure 5.
- the curved parts 27 of each grommet 23 are fitted closely in said U-shaped slot, such that they cannot be pulled flat under the influence of the tensile forces.
- a fixing cable 32 is fastened to the striking shoes 29, which fixing cable is connected by means of block 33 to a cable 34 which is suspended from the hoisting line 35 of the piling rig.
- the pile shoes 28 located at the bottom of the grommets 23 are hooked under the lugs 38 which are welded to the pile 11.
- the ram 20 has two opposing projections 39, which are positioned such that the striking shoes 29, in particular the striking face 37 thereof, are located in the path of said projections 39.
- the ram 20 can be accelerated upward by means of the hydraulic cylinder-piston device 16, the projections 39 ultimately each coming into contact with the striking face 37 of a striking shoe 29.
- the jolt generated as a result is transmitted via the cable loops 23 onto the pile 11, as a result of which said pile moves upwards.
- the striking face 37 of the striking shoes is preferably located some distance away from the imaginary mid point 41 of the circle which defines the bottom 30 of the U-shaped slot. This position of the striking face 37 prevents a situation where the striking shoes 29 would be able to start to tilt under the influence of the blows struck thereon by the projections 39.
- the ram 20 which is shown in detail in Figure 4, is provided with guides 40 which engage, in pairs, on either side of, in each case, one main upright 15 of the frame 9.
- the nose 21 of the ram is narrower than the remainder thereof.
- the transition between said nose 21 and said remainder proceeds fluently via a curved line, such that the force wave generated in the ram 20 generates virtually no parasitic shock waves.
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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)
- Placing Or Removing Of Piles Or Sheet Piles, Or Accessories Thereof (AREA)
Description
- The invention is related to an installation for extracting from the ground a slender object, such as a pipe, pile or sheet pile section, which has been driven into said ground, which installation comprises a hammer device with a ram, drive means for moving the ram, striking means which have a striking face, oriented towards the slender object, for receiving blows originating from the ram brought into movement by the drive means, and a pulling construction by means of which the striking means can be connected to the slender object, which pulling construction comprises cable means in loop form which at their one end interact with the striking means and at their other end can be brought into interaction with the slender object, wherein the cable means comprise at least two cables, each of which has been shaped to give a cable loop.
- An installation of this type is disclosed in GB-A-1178962. Said prior art installation makes use of a guiding construction for the cable means which consists of two tubes. Said tubes are positioned on both sides of the installation and are connected to a bottom yoke, which can be connected to an object to be pulled. The cable means are guided through the tubes.
- The use of pulling cables is advantageous for the effectiveness of the installation. This beneficial effect has to be ascribed to the long duration of the pull stroke, which is far in excess of 5 milliseconds. If the tensile force, generated by the ram, introduced into the pile is greater than half the total shaft friction before the pile starts to be driven out by the pull it is found that, for every soil stratum, the shaft friction is excessively reduced as a result of the increase which takes place in the residual pulse and in the duration of the residual pulse after every blow by the impact device driver, as a result of which the extraction of the pile proceeds much more rapidly than expected.
- The object of the invention is to provide an installation of the type described before which is of a simpler design. This object is achieved in that each loop consists of two straight, essentially parallel, parts and two curved parts, which extend over a bend of essentially 180°, and in that the cable means of the pulling construction comprises cables of a thickness which is between 25 and 200 mm.
- By virtue of the fact that the cable means are in loop form, the connection to the striking means and the object can be constructed such that, on the one hand, the beneficial effects on the functioning of the installation, which have been described above, are obtained and, on the other hand, a reliable and uniform transmission of force is ensured, even under the high dynamic loads. The loop form provides the cable means with the ability to adapt to the connections to the striking means and the object in such a way that non-uniform loads can be avoided.
- The cable means can comprise two steel cables, each of which has been shaped to give a cable loop consisting of two straight, essentially parallel, parts and two curved parts, which extend over a bend of essentially 180°. The ends of each steel cable can be joined to one another by means of one or more sleeve clamps.
- To ensure the desired uniform transmission of forces, a cable shoe which fits closely around the cable can be incorporated in each of the curved parts. The cable shoes enable the loop to adjust such that both parts are subjected to equal loads. Furthermore, the cable shoes provide the curved parts of the cable with lateral support, so that the cable cannot be pulled flat at these locations under the high impact loads.
- Preferably, each cable shoe has an essentially U-shaped outer contour and the curved parts of a cable loop are held in place by means of securing means, such as pins or bolts which extend between the two arms of the U-shaped outer contour. Especially in the case of thicker cables, which try to resume a less curved shape, it can be ensured in this way that the interaction with the cable shoes is maintained.
- Each cable loop can have a striking shoe, which has an essentially flat striking face on that side thereof which faces away from the U-shaped outer contour. The bottom of the U-shaped outer contour of each striking shoe is essentially coincident with part of an imaginary circle, whilst the striking face of the striking shoe is located between the mid point of said imaginary circle and the bottom of the outer contour. A construction of this type offers the advantage that the striking shoe remains in stable interaction with the steel cable, even under the high loads which otherwise could lead to a tilting movement relative to the steel cable.
- In this context the distance from the striking face to the bottom of the U-shaped outer contour, measured perpendicular to the striking face, is preferably less than or equal to the radius of said imaginary circle. In particular, the distance from the striking face to the bottom of the U-shaped cross-section can be greater than 60 % of the radius of said imaginary circle.
- To ensure optimum impact transmission, the striking face is defined by a plateau which on either side adjoins recessed parts which extend as far as the outer contour of the striking shoe.
- Furthermore, each cable loop has a pile shoe which can be brought into interaction with a pile or tube, which pile shoes each have a bearing surface on that side thereof which faces away from the outer contour, which bearing surface can be brought into interaction with a supporting lug provided on the pile or tube.
- According to the invention the ram, together with drive means, is incorporated in a frame which is provided at the bottom with a driving cap and is guided along a leader of a mobile piling rig, in such a way that the frame with its driving cap can be positioned on the slim object, and the cable means in loop form extend from the slim object along the frame and the striking shoes are located in the path of the ram, which striking shoes are suspended from the hoisting means of the piling rig.
- The installation is found to function well if the thickness of the steel cables is between 25 and 120 mm, in particular between 50 and 120 mm. Too much rotation of the striking shoes about a vertical axis during operation, which can lead to the ram impinging incorrectly on the striking face of the striking shoe and to the cable and/or the piling rig being damaged, can be prevented by using rotation-free steel cables.
- The cables in the installation can also be made up from synthetically produced threads or yarns, such as those produced from a polyamide, polyethene, polyester, polypropene or carbon or from combinations thereof. The thickness of this type of cables is between 50 and 200 mm, preferably between 100 and 170 mm.
- The invention will be explained in more detail below with reference to an illustrative embodiment shown in the figures.
- Figure 1 shows an installation according to the invention, constructed as a mobile pile-driving installation.
- Figure 2 shows an enlarged detail of the installation according to Figure 1.
- Figure 3 shows a front view of the detail according to Figure 2.
- Figure 4 shows a ram or monkey as used in the installation according to Figures 1-3.
- Figure 5 shows a detail with striking shoe.
-
- The installation shown in Figure 1 comprises a mobile piling rig, which is indicated in its entirety by 1, provided with a
mobile chassis 2 fitted with caterpillar tracks, as well as acab 3 rotatably mounted thereon. A column 6 is fixed to saidcab 3 in an adjustable manner by means of hydraulic cylinder-piston device 4 and 5. Both column 6 and thechassis 2 are supported on a substrate which, for example, consists ofplanks 7. - A
leader 8 is mounted on the column 6, along which leader theframe 9, which is to be described in more detail, is slidable by means ofclaws 10. - By means of the piling rig 1 the
tube 11 can either be driven in or extracted from theground 12. Saidtube 11 is provided at its top with ahead 13 with fill opening 14 for pouring a concrete pile into the work. Theframe 9 is positioned on the top end of thetube 11, as can also be seen in Figures 2 and 3. In Figures 2 and 3 the contour of theframe 9 is indicated diagrammatically by dash-and-dot lines. One of the twomain uprights 15 of said frame is also shown. A hydraulic cylinder-piston device 16, together with the associatedaccumulator installation 17 andhydraulic lines 18, is fixed close to the top of saiduprights 15. The ram or fallingweight 20 is fixed to thepiston rod 19 of the hydraulic cylinder-piston device 16. - The
ram 20 according to the invention can be used in two ways. According to a first possibility, in which it is used as a an impact pile-driving ram, theram 20 is moved upward by means of the hydraulic cylinder-piston device and is then released such that thenose 21 of theram 20 is able to inflict blows on the drivingcap 22 which has been placed on the top of thetube 11. In this case the installation according to the invention is functioning as an impact device driver inserting piles. - According to a second possibility, the ram can be used to extract a driven-in
tube 11 from the ground. For this purpose the installation is equipped with two cable loops orgrommets 23. Saidgrommets 23, which are made up from a single piece of cable, the ends of which have been fixed to one another by means ofcrimp connectors 24, comprise two essentiallystraight parts 25 as well as alower part 26, which is curved through about 180°, and an uppercurved part 27. -
Pile shoes 28 are fixed at the lower curved portion andstriking shoes 29 are fixed at the upper curved portion. - The
pile shoes 28 and thestriking shoes 29 possess an outward-facing essentially U-shaped slot which extends over an 180° bend. Astriking shoe 29, the bottom of which is indicated by 30, is shown in Figure 5. Thecurved parts 27 of eachgrommet 23 are fitted closely in said U-shaped slot, such that they cannot be pulled flat under the influence of the tensile forces. - The
curved cable sections pins 36 which extend between the two walls of said U-shaped slot. - A
fixing cable 32 is fastened to thestriking shoes 29, which fixing cable is connected by means ofblock 33 to acable 34 which is suspended from the hoistingline 35 of the piling rig. - The
pile shoes 28 located at the bottom of thegrommets 23 are hooked under thelugs 38 which are welded to thepile 11. - The
ram 20 has twoopposing projections 39, which are positioned such that thestriking shoes 29, in particular thestriking face 37 thereof, are located in the path of saidprojections 39. Theram 20 can be accelerated upward by means of the hydraulic cylinder-piston device 16, theprojections 39 ultimately each coming into contact with thestriking face 37 of astriking shoe 29. The jolt generated as a result is transmitted via thecable loops 23 onto thepile 11, as a result of which said pile moves upwards. - While the blows are being struck, the
cable loops 23 are continuously pulled upwards by means of the hoistingline 35 of the piling rig. - The
striking face 37 of the striking shoes is preferably located some distance away from the imaginarymid point 41 of the circle which defines the bottom 30 of the U-shaped slot. This position of thestriking face 37 prevents a situation where thestriking shoes 29 would be able to start to tilt under the influence of the blows struck thereon by theprojections 39. - The
ram 20, which is shown in detail in Figure 4, is provided withguides 40 which engage, in pairs, on either side of, in each case, onemain upright 15 of theframe 9. - As is shown in Figure 4, the
nose 21 of the ram is narrower than the remainder thereof. The transition between saidnose 21 and said remainder proceeds fluently via a curved line, such that the force wave generated in theram 20 generates virtually no parasitic shock waves. There is also a gradual transition from theprojections 39 to those parts of theram 20 located lower down, so that here too the generation of parasitic shock waves is prevented. - By virtue of said shaping, virtually no stress concentrations occur in the
ram 20, which has a favourable effect on the life thereof.
Claims (14)
- Installation for extracting from the ground (12) a slender object (11), such as a pipe, pile or sheet pile section, which has been driven into said ground (12), which installation comprising a hammer device with a ram (20), drive means (16) for moving the ram (20), striking means (29) which have a striking face (37), oriented towards the slender object (11), for receiving blows originating from the ram (20) brought into movement by the drive means (16), and a pulling construction (23-29) by means of which the striking means (29) can be connected to the slender object (11), which pulling construction (23-29) comprises cable means (23) in loop form which at their one end interact with the striking means (29) and at their other end can be brought into interaction with the slender object (11), wherein the cable means (23) comprise at least two cables, each of which has been shaped to give a cable loop, characterised in that each loop consists of two straight, essentially parallel, parts (25) and two curved parts (26, 27), which extend over a bend of essentially 180°, and in that the cable means (23) of the pulling construction (23-29) comprises cables of a thickness which is between 25 and 200 mm.
- Installation according to Claim 1, wherein a metal cable shoe which fits closely around the cable is incorporated in each of the curved parts.
- Installation according to Claim 2, wherein each cable shoe has an essentially U-shaped outer contour and the curved parts of a cable loop are held in place by means of securing means, such as pins or bolts which extend between the two arms of the U-shaped outer contour.
- Installation according to claim 2 or 3 and each cable loop has a striking shoe with an essentially flat striking face on that side thereof which faces away from the U-shaped outer contour, wherein the bottom of the U-shaped outer contour of each striking shoe is essentially coincident with part of an imaginary circle, and the striking face of the striking shoe is located between the mid point of said imaginary circle and the bottom of the outer contour.
- Installation according to Claim 4, wherein the distance from the striking face to the bottom of the U-shaped outer contour, measured perpendicular to the striking face, is less than or equal to the radius of said imaginary circle.
- Installation according to Claim 5, wherein the distance from the striking face to the bottom of the U-shaped cross-section is greater than 60 % of the radius of said imaginary circle.
- Installation according to Claim 4, 5 or 6, wherein the striking face is defined by a plateau which on either side adjoins recessed parts which extend as far as the outer contour of the striking shoe.
- Installation according to one of Claims 4-7, wherein each cable loop has a pile shoe which can be brought into interaction with a pile or tube, which pile shoes each have a bearing surface on that side thereof which faces away from the outer contour, which bearing surface can be brought into interaction with a supporting lug provided on the pile or tube.
- Installation according to one of Claims 4-8, wherein the ram has two opposing projections and the cable means comprise two cable loops, such that the projections on the ram reach into the cable loops.
- Installation according to one of the preceding claims, wherein the cables are steel cables, the thickness of which is between 25 and 120 mm.
- Installation according to Claim 10, wherein the thickness of the steel cables is between 50 and 120 mm.
- Installation according to Claim 10 or 11, wherein the steel cables are rotation-free.
- Installation according to any of the preceding Claims, wherein the cables are made up from synthetically produced threads or yarns, such as of a polyamide, a polyethene, a polyester, a polypropene or a carbon or from combinations thereof and wherein the thickness of the cables is between 50 and 200 mm.
- Installation according to Claim 13, wherein the thickness of the cables is between 100 and 170 mm.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL1005236 | 1997-02-10 | ||
NL1005236A NL1005236C2 (en) | 1997-02-10 | 1997-02-10 | Installation for the removal of driven objects. |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0857830A1 EP0857830A1 (en) | 1998-08-12 |
EP0857830B1 true EP0857830B1 (en) | 2003-11-12 |
Family
ID=19764390
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19980200418 Expired - Lifetime EP0857830B1 (en) | 1997-02-10 | 1998-02-10 | Installation for extracting objects driven in with a piling rig |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0857830B1 (en) |
DE (1) | DE69819573T2 (en) |
NL (1) | NL1005236C2 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10255753A1 (en) * | 2002-11-28 | 2004-06-09 | Menck Gmbh | Ram device for driving in piles has distance between separable pile guide's lower end and hammer cover smaller than twice internal diameter of pile guide, preferably less than half internal diameter |
EP3708714B1 (en) * | 2019-03-13 | 2021-01-13 | BAUER Maschinen GmbH | Securing device for securing a civil engineering element and civil engineering method |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB440140A (en) * | 1934-11-05 | 1935-12-20 | Josef Wohlmeyer | Improvements in and relating to apparatus for driving or withdrawing piles, stakes, or the like |
GB1178962A (en) * | 1966-02-01 | 1970-01-28 | British Steel Piling Co Ltd | Improvements in pile drivers |
NL9401144A (en) | 1994-07-11 | 1996-02-01 | Hollandsche Betongroep Nv | Method and device for removing a driven-in object. |
NL1000962C2 (en) * | 1995-08-10 | 1996-07-15 | Ihc Holland Nv | Driving long piles into ground without buckling - uses gas spring and detachable couplings to keep pile under tension until it has been sunk sufficiently to ensure stability |
-
1997
- 1997-02-10 NL NL1005236A patent/NL1005236C2/en not_active IP Right Cessation
-
1998
- 1998-02-10 DE DE69819573T patent/DE69819573T2/en not_active Expired - Fee Related
- 1998-02-10 EP EP19980200418 patent/EP0857830B1/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
DE69819573T2 (en) | 2004-09-16 |
NL1005236C2 (en) | 1998-08-11 |
EP0857830A1 (en) | 1998-08-12 |
DE69819573D1 (en) | 2003-12-18 |
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