WO1989008210A1 - Douille de aussiere - Google Patents

Douille de aussiere Download PDF

Info

Publication number
WO1989008210A1
WO1989008210A1 PCT/NO1988/000018 NO8800018W WO8908210A1 WO 1989008210 A1 WO1989008210 A1 WO 1989008210A1 NO 8800018 W NO8800018 W NO 8800018W WO 8908210 A1 WO8908210 A1 WO 8908210A1
Authority
WO
WIPO (PCT)
Prior art keywords
segments
socket
sleeve
group
rope
Prior art date
Application number
PCT/NO1988/000018
Other languages
English (en)
Inventor
Ivar Krogstad
Original Assignee
Mocos - Marine And Offshore Consulting Services, A
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 Mocos - Marine And Offshore Consulting Services, A filed Critical Mocos - Marine And Offshore Consulting Services, A
Priority to PCT/NO1988/000018 priority Critical patent/WO1989008210A1/fr
Publication of WO1989008210A1 publication Critical patent/WO1989008210A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16G—BELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DRIVING PURPOSES; CHAINS; FITTINGS PREDOMINANTLY USED THEREFOR
    • F16G11/00—Means for fastening cables or ropes to one another or to other objects; Caps or sleeves for fixing on cables or ropes
    • F16G11/04—Means for fastening cables or ropes to one another or to other objects; Caps or sleeves for fixing on cables or ropes with wedging action, e.g. friction clamps
    • F16G11/05—Means for fastening cables or ropes to one another or to other objects; Caps or sleeves for fixing on cables or ropes with wedging action, e.g. friction clamps by using conical plugs insertable between the strands
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16G—BELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DRIVING PURPOSES; CHAINS; FITTINGS PREDOMINANTLY USED THEREFOR
    • F16G11/00—Means for fastening cables or ropes to one another or to other objects; Caps or sleeves for fixing on cables or ropes
    • F16G11/04—Means for fastening cables or ropes to one another or to other objects; Caps or sleeves for fixing on cables or ropes with wedging action, e.g. friction clamps
    • F16G11/044—Means for fastening cables or ropes to one another or to other objects; Caps or sleeves for fixing on cables or ropes with wedging action, e.g. friction clamps friction clamps deforming the cable, wire, rope or cord
    • F16G11/046—Means for fastening cables or ropes to one another or to other objects; Caps or sleeves for fixing on cables or ropes with wedging action, e.g. friction clamps friction clamps deforming the cable, wire, rope or cord by bending the cable around a surface
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16G—BELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DRIVING PURPOSES; CHAINS; FITTINGS PREDOMINANTLY USED THEREFOR
    • F16G11/00—Means for fastening cables or ropes to one another or to other objects; Caps or sleeves for fixing on cables or ropes
    • F16G11/04—Means for fastening cables or ropes to one another or to other objects; Caps or sleeves for fixing on cables or ropes with wedging action, e.g. friction clamps
    • F16G11/044—Means for fastening cables or ropes to one another or to other objects; Caps or sleeves for fixing on cables or ropes with wedging action, e.g. friction clamps friction clamps deforming the cable, wire, rope or cord
    • F16G11/048—Means for fastening cables or ropes to one another or to other objects; Caps or sleeves for fixing on cables or ropes with wedging action, e.g. friction clamps friction clamps deforming the cable, wire, rope or cord by moving a surface into the cable

Definitions

  • the invention relates to a sleeve-like end attachment or socket for ropes, preferably fiber ropes, and particularly double-braided ropes having a core and an outer layer.
  • End attachments for fiber ropes are usually an eye splice. If the end attachment is to be subjected to higher loads, the eye is provided with a thimble which provides good support for about half of the circumference of the rope and a reasonably large bending radius. The ultimate strength of the rope at the eye splice is usually lower than for the rope itself.
  • An eye splice comprises a relatively large part of the length of the rope.
  • conical metal sleeves or sockets with a central conical plug are used for fiber ropes having parallel fibers without strands arranged in a hose-like sheath holding the fibers in place.
  • the cone in the socket and the plug must be relatively long in order for the friction between the rope and socket to be sufficiently large for the rope not to slide out. This results in large radial forces and, thus, large dimensions of the socket relative to the rope.
  • conical sockets As end attachments.
  • the strands are spread outwards like a brush inside the socket and is thereupon cast in zink or thermosetting plastic.
  • conical sockets having internal clamping ' - sleeves where the strands either are clamped inside the inner sleeve or between the sleeve and socket.
  • end attachment By the end attachment according to the invention it is obtained that one can use a relatively short socket as end attachment, while concurrently the clamping action on the rope and the bursting effect on the socket are moderate.
  • the moderate socket dimensions and the large hold ⁇ ing force are obtained according to the invention by dividing the strands of the rope into two groups, each taking about half the ultimate load. These two groups are guided in opposite directions back and forth along seg ⁇ ments which together constitute a sleeve which is cylind ⁇ rical on the inside and conical on the outside and rounded like half of a toroid at the rear where the sleeve is thickest. Each group of strands is divided into as many sub-groups as there are segments and is guided mainly along the surfaces of these segments. One of the groups of strands is guided from the forward edge of the sleeve along the conical outside, around the back and further back to the forward edge on the inside of the sleeve.
  • the other group of strands is also led from the forward edge of the sleeve, but in the opposite direction and with the best possible contact with the first group.
  • the sleeve with the rope strands wrapped around it is pulled by the rope down into the internally conical metal socket, which approximately fits the conicity of the first sleeve with the rope wrapped around, the two groups of rope are pressed against each other over the entire contact length between the two cones, over the toroidal rear and through the middle of the cylinder.
  • the two rope groups are locked against each other by friction and the harder the higher the rope force becomes.
  • the frictional force between the rope and the socket and sleeve along the entire length of contact between these parts are also led from the forward edge of the sleeve, but in the opposite direction and with the best possible contact with the first group.
  • the seg ⁇ ments of the inner sleeve must be radially compressible so that the strands in the middle are subjected to about the same force as the strands between the sleeve and socket.
  • the internal diameter of the sleeve must therefore be sufficiently small to allow the necessary compression. Thus, gaps will exist between the segments as long as the rope force has not reached the maximum.
  • the outer sleeve or socket which is to absorb the radial bursting force as tensile force and transmit the rope force further, is preferably made of metallic material.
  • the inner sleeve generally takes up compres- sional forces only and may advantagelusly be plastic. it is therefore preferably made of plastic material.
  • the inner sleeve Due to. the conicity the inner sleeve has a fairly high material thickness towards the rear, which can be utilized to provide a large bending radius for the strands of the rope passing over the semi-toroidal surface.
  • the inner sleeve is divided in segments, it is preferable to place guiding plates along the bounding surfaces in order to keep the rope strands in place before all the segments are placed in the outer socket.
  • the inner sleeve When the rope is subjected to tension, the inner sleeve will be pulled radially farther into the outer socket and the rope strands will interlock gradually.
  • the tension in the various strands should be allowed to equalize as much as possible when the strands are locked more firmly. All the strands have to pass a cylindrical area at the center and an annular area bounded by the two cones . Since the same amount of rope has to pass through both areas, these have to be of about the same size. This is also true in the longitudinal direction, and the external cone of the inner sleeve will therefore be steeper than the internal cone of the outer socket. When the inner sleeve is displaced axially with respect to the socket, the relationship between the annular areas changes, but this may be utilized in order to improve the balance between the strands of the rope.
  • the strands By carefully choosing the dimensions the strands will be compressed the most closest to the inlet or the leading edge, where the diameter is the least when the tensioning of the rope is commenced for the first time.
  • the strands having the highest loading will in this situation extend over the entire length from the inlet, where the clamping load is relatively high but still mode ⁇ rate, further to the rear of the sleeve, around the bend and back towards the inlet. On this distance the clamping load will be less, while it increases towards the inlet on the return path.
  • the clamping force in the center and in the annular space automatically will be equalized since the inner sleeve is free to adjust radially.
  • the method for assembling the rope in the hawser attachment becomes as follows, but the sequence of the various steps may be changed.
  • the rope is lashed some distance from the end and the braiding or twisting of the strands outside the lashing is opened.
  • the loose strands are collected and pulled through the outer socket until also the lashing is through the socket.
  • the strands are divided into two main groups, both of which represent about half of the tensile strength of the rope. For double braided ropes having a core and an outer layer this becomes very simple since each of these normally carries half the ultimate load and forms a natural main group.
  • the groups are divided into the same number of sub-groups as there are segments in the inner sleeve and also as symmetrically as possible along the periphery of the rope.
  • the sub-grbups may be divided in further small groups of strands arranged as symmetrically as possible within the part of the periphery of the rope allocated to the segment.
  • the first segment is held approximately axially with respect to the rope at a predetermined distance between the lashing and the forward or thinest part of the segment.
  • a sub-group of strands is run along the outside of the segment, over the rounded rear part and back along the inside of the segment.
  • the strands are partly held in place by the guide plates extending in the radial exten ⁇ sion of the bounding surface between the segments, but in order to ascertain the correct length with respect to the lashing, it is advantageous also to secure the strands by means of elastic tape.
  • a good safeguarding is to secure the end of the sub-group to itself by means of the tape just outside the leading edge of the segment.
  • the second sub-group is thereafter run in the opposite direction of the first between the guiding plates on the inside of the segment, around the rear part and back along the outside until it has passed the forward or leading edge of the segment and is secured by means of tape to all the other strands, which thus run both forwards and backwards at this point. It will be necessary to somewhat bend aside the guide plates on the inside of the segment in order to make room for the la.st sub-group of strands .
  • the method becomes much the same.
  • the strands in each small group are run in opposite direction as descri ⁇ bed above.
  • care is taken that the layers become as even as possible so that strands running in opposite directions obtain the best possible contact with each other.
  • the strands may be flattened or partially opened.
  • On the outside of the segment it is relatively simple to obtain good stratifi ⁇ cation, while on the inside good contact may also be obtained between the strands from the two main groups when they are pressed between the guide plates.
  • the segment may be released and the next segment be placed in the corresponding position with respect to the lashing. This segment and the remaining segments are covered with strands in a corresponding manner. Thereupon the segments are placed axially and symmetrically with respect to the rope as well as possible, and the segments are mutually secured temporarily by means of elastic tape. Then the rope is pulled back through the outer socket until the cone of the segments meets the internally conical surface of the outer socket . When the rope is subjected to tension, the segments will be pulled further into the socket and normally be locked therein .
  • FIG. 1 shows a longitudinal section
  • Fig. 2 shows a cross-section
  • Figs. 3 and 4 cross-sections of a segment without rope and with rope, respectively, before it is placed in the outer socket
  • Fig. 5 is a detail of the strands at the forward edge of the segments before they are pressed into the outer socket.
  • Fig. 1 shows a section through a hawser attachment after fastening of the hawser.
  • the hawser is a double-braided artificial fibre hawser having core 2 and outer layer 3, which each takes about half the ulti ⁇ mate load of the hawser.
  • the outer layer 3 and the further course of the strands of the same are shown in black where they are shown in section in the drawings, while the core 2 is dotted.
  • the rope is lashed 4 and above the lashing the braiding is loosened so that all the strands are free.
  • the outer socket 5 is preferably made of steel in order to have moderate dimensions. Internally the socket 5 is conical 10, except from the lowest part at the inlet, which is shown cylindrical 9.
  • the internal sleeve consists of several segments 6 with leading or forward edge 7, conical outer surface 11, semitoroidal rear part 14 and cylindrical inner surface 12.
  • the segments 6 are preferably made of plastic material which is deformable without damaging the rope.
  • the strands from the outer layer 3 are guided along the conical outer surface 11 of the segments 6, over the toroidal rear part 14 and back to the leading edge 7 along the inside 12 of the segments 6.
  • the strands from the core 2 of the rope are guided centrally of the segments 6, on the outside of the outer layer 3, over the toroidal rear part 14 of the segments 6 and back towards the inlet 9 of the outer socket 5.
  • the figure also shows that the unloaded ends of the strands of the core 2 provide protection for the most highly loaded parts of the outer layer 3 in the area 9 at the inlet of the socket 5. Similarly, the unloaded end of the strands of the outer layer 3 provides protection of the most highly loaded parts of the core 2 at the leading edge 7 of the segments 6.
  • Fig. 2 is a cross-section along the line I - I in Fig. 1.
  • the inner sleeve is divided axially into four identical segments 6.
  • Guide plates 8, 8' are shown in the bounding sur- faces adjacent the next segment and these guide plates are radially extended on the inside and outside of the seg ⁇ ment. The purpose is to hold the strands in place in the segments 6 before these are placed in the outer socket 5. The drawing shows that the inner parts of the guide plates 8, 8' have been deformed when the segments 6 were pulled into the outer socket 5.
  • the guide plates 8, 8' are glued to the segments, but they may also be made in one piece.
  • Fig. 3 shows a similar cross-section as Fig. 2 through a segment 6 having guide plates 8, 8' before the rope strands are assembled.
  • Pig. 4 shows a cross-section of the same segment after the rope strands 2, 3 have been assembled but before the segments 6 are pulled into the outer socket.
  • the rope strands 2, 3 are further divided into small groups 2', 2", 3' , 3" of the core 2 and outer layer 3. These small groups lie in layers 2' , 3' and 2", 3", and the strands 2 and 3 have opposite tension directions.
  • the number of contact surfaces between the layers have been increased from one to three and, since the compression force is about the same, the frictional forces locking the rope in the hawser attach ⁇ ment is about tripled.
  • Fig. 5 shows a longitudinal section through the segments 6 at the leading edge 7 before the segments are arranged in the outer socket 5.
  • the figure shows, with exaggerated thickness, elastic tapes 15 and 16 holding the strands together in the outer layer 3 and the core 2, respectively, for each segment 6. Since here the outer layers 3 lie between the core strands 2, also the outer strands become surrounded by the tape 16. More tape 17 holds all the segments with the strands together ahead of the leading edge 7 and further up along the conical surface.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Ropes Or Cables (AREA)

Abstract

Une fixation de aussière comprend une douille (5) conique intérieurement ainsi qu'un manchon concentrique intérieur, conique extérieurement, divisé en segments. Les fils d'une corde (1) à fixer entre la douille et le manchon, sont divisés en groupes (2, 3), l'un des deux groupes (2) étant guidé à travers l'espace creux du manchon intérieur (6) à partir de son extrémité la plus étroite, sur son extrémité large (14) et en retour le long de l'intérieur de la douille extérieure (5), tandis que l'autre groupe (3) est guidé, chevauchant le premier groupe (2), dans le sens inverse, le long de l'extérieur du manchon intérieur (6), autour de son extrémité large (14) et en retour à travers son espace creux.
PCT/NO1988/000018 1988-03-03 1988-03-03 Douille de aussiere WO1989008210A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/NO1988/000018 WO1989008210A1 (fr) 1988-03-03 1988-03-03 Douille de aussiere

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/NO1988/000018 WO1989008210A1 (fr) 1988-03-03 1988-03-03 Douille de aussiere

Publications (1)

Publication Number Publication Date
WO1989008210A1 true WO1989008210A1 (fr) 1989-09-08

Family

ID=19907497

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NO1988/000018 WO1989008210A1 (fr) 1988-03-03 1988-03-03 Douille de aussiere

Country Status (1)

Country Link
WO (1) WO1989008210A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2469921B (en) * 2009-04-30 2011-11-23 First Subsea Ltd Rope termination
CN104214432A (zh) * 2014-09-10 2014-12-17 中天科技海缆有限公司 一种钢丝铠装海缆用平台锚固装置
WO2015195278A1 (fr) * 2014-06-19 2015-12-23 Hood Technology Corporation Système de formation de terminaison de cordage

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2418880A1 (de) * 1974-04-19 1975-10-30 Gleistein & Sohn Gmbh Geo Endverbindung fuer ein seil, insbesondere ein kunststoffseil
DE3045007A1 (de) * 1979-11-23 1981-09-03 Freyssinet International (S.T.U.P.), 92100 Boulogne-Billancourt, Hauts-de-Seine Vorrichtung zur verankerung einer vorgespannten bewehrung mittels keilen
GB2175623A (en) * 1985-03-22 1986-12-03 Fathom Oceanology Ltd Cable fairing support ring
FR2582767A1 (fr) * 1985-05-30 1986-12-05 Freyssinet Int Stup Perfectionnements aux mors tronconiques d'ancrage

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2418880A1 (de) * 1974-04-19 1975-10-30 Gleistein & Sohn Gmbh Geo Endverbindung fuer ein seil, insbesondere ein kunststoffseil
DE3045007A1 (de) * 1979-11-23 1981-09-03 Freyssinet International (S.T.U.P.), 92100 Boulogne-Billancourt, Hauts-de-Seine Vorrichtung zur verankerung einer vorgespannten bewehrung mittels keilen
GB2175623A (en) * 1985-03-22 1986-12-03 Fathom Oceanology Ltd Cable fairing support ring
FR2582767A1 (fr) * 1985-05-30 1986-12-05 Freyssinet Int Stup Perfectionnements aux mors tronconiques d'ancrage

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
DERWENT'S ABSTRACT NO. E3313 K/13; & SU,A,929 912. *
DERWENT'S ABSTRACT NO. F2579 E/18; & SU,A,846 890. *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2469921B (en) * 2009-04-30 2011-11-23 First Subsea Ltd Rope termination
WO2015195278A1 (fr) * 2014-06-19 2015-12-23 Hood Technology Corporation Système de formation de terminaison de cordage
US9873979B2 (en) 2014-06-19 2018-01-23 Hood Technology Corporation Hollow-braided rope having a rope termination formed therein and a rope termination forming system for forming the rope termination
EP3158227A4 (fr) * 2014-06-19 2018-08-08 Hood Technology Corporation Système de formation de terminaison de cordage
CN104214432A (zh) * 2014-09-10 2014-12-17 中天科技海缆有限公司 一种钢丝铠装海缆用平台锚固装置

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