EP0722015B1 - Suspension bridge cable wrap and application method - Google Patents

Suspension bridge cable wrap and application method Download PDF

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Publication number
EP0722015B1
EP0722015B1 EP19950300215 EP95300215A EP0722015B1 EP 0722015 B1 EP0722015 B1 EP 0722015B1 EP 19950300215 EP19950300215 EP 19950300215 EP 95300215 A EP95300215 A EP 95300215A EP 0722015 B1 EP0722015 B1 EP 0722015B1
Authority
EP
European Patent Office
Prior art keywords
strand
cable
tubular article
synthetic rubber
around
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
Application number
EP19950300215
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0722015A1 (en
Inventor
Stephen G. Mathey
Roy J. Lanham
Bernard J. Mcmartin
Arnold L. Rader
Daniel H. Brown
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.)
D S Brown Company Inc
Brown DS Co
Original Assignee
D S Brown Company Inc
Brown DS Co
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 D S Brown Company Inc, Brown DS Co filed Critical D S Brown Company Inc
Priority to DE1995603749 priority Critical patent/DE69503749T2/de
Priority to EP19950300215 priority patent/EP0722015B1/en
Priority to DK95300215T priority patent/DK0722015T3/da
Publication of EP0722015A1 publication Critical patent/EP0722015A1/en
Application granted granted Critical
Publication of EP0722015B1 publication Critical patent/EP0722015B1/en
Priority to HK98113238.8A priority patent/HK1012034B/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B7/00—Details of, or auxiliary devices incorporated in, rope- or cable-making machines; Auxiliary apparatus associated with such machines
    • D07B7/02—Machine details; Auxiliary devices
    • D07B7/14—Machine details; Auxiliary devices for coating or wrapping ropes, cables, or component strands thereof
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D19/00—Structural or constructional details of bridges
    • E01D19/16—Suspension cables; Cable clamps for suspension cables ; Pre- or post-stressed cables

Definitions

  • This invention relates to a wrap for a large, lengthy outdoor tubular article, such as a cable of a suspension bridge or cable-stayed bridge, and to a method for applying such a wrap to such an article.
  • Cables for suspension bridges and cable-stayed bridges are exposed to severe outdoor climatic conditions and must be painted or otherwise coated to avoid rusting and other forms of deterioration that can result from such exposure.
  • Traditionally such cables were painted with weather-resistant paint, but periodic repainting of painted cables is still required, at substantial expense due to the relative inaccessibility of such cables, because of the severity of the climatic conditions to which such painted cables are often exposed. Removal of paint prior to repainting, which is often necessary for proper repainting, also raises environmental concerns.
  • bridge cables can be more permanently protected from exposure by spirally wrapping them with a strand of indefinite length of a Neoprene or similar polychloroprene material (see, e.g. US-A-3 789 594).
  • a material of this type usually cannot be properly precolored to match or blend in appearance with the other elements of a bridge or other structure where it is to be used.
  • a cable for a suspension bridge or a cable-stayed bridge or other large, lengthy outdoor tubular article may be advantageously protected from exposure to severe climatic conditions by spirally wrapping it with a flexible strand of indefinite length of a suitable synthetic rubber material, such as a material being sold for various uses, such as a roof covering material, under the brand name "Hypalon.”
  • a suitable synthetic rubber material such as a material being sold for various uses, such as a roof covering material, under the brand name "Hypalon.”
  • Such material can be prepigmented in a wide variety of colors, thus eliminating the need for after painting that was characteristic of Neoprene coverings to obtain a proper color match between the exterior of the cover and the other elements of the bridge or adjacent structure.
  • overlapping portions of successive turns of such a synthetic rubber can be properly sealed to one another to seal the seam therebetween by a heat sealing operation, for example, by passing an annular radiant heater or an internally heated annular blanket therealong, to thereby eliminate the need for a solvent sealing step and its attendant solvent handling problems that was characteristic of Neoprene coverings.
  • a further advantage of a heat sealing step, as described above, is that a synthetic rubber covering material such as Hypalon brand synthetic rubber covering material can be provided with a significant degree of heat shrinkability in its longitudinal or machine direction.
  • a synthetic rubber covering material such as Hypalon brand synthetic rubber covering material can be provided with a significant degree of heat shrinkability in its longitudinal or machine direction.
  • the temperature level that is required to seal superimposed layers or turns of such material to one another will cause such layers to contract or shrink, and thereby ensure that the bridge cable or other article is very snugly engaged by its spirally extending covering.
  • a Hypalon synthetic rubber strand used in the practice of the present invention preferably is a laminate of two layers of such material to provide a suitable covering thickness.
  • a reinforcing scrim or screen such as a scrim formed from a polyester or other high tensile strength organic material, imbedded between the layers to improve the overall tensile strength of the strand.
  • the use of such a scrim will reduce the degree of heat shrinkability of the strand, but if the strand is maintained under tension as it is applied to the cable, a scrim reinforced synthetic rubber strand will still have sufficient heat shrinkability to ensure that the cable covering will snugly engage the underlying cable.
  • such a seal is provided by the use of a generally wedge-shaped extrusion of a Neoprene or similar elastomeric material which is joined end to end to form an annular member snugly surrounding a portion of the cable which is immediately adjacent to the stanchion or other supporting member, with a thicker end of the annular member in snug, sealing engagement with a surface of the cable supporting stanchion.
  • the ends of the extrusion are adhesively joined to one another and the annular member is then preferably mechanically restrained in such configuration by circumscribing it by a high tensile strength plastic strap or band.
  • a relatively short sleeve of a Hypalon synthetic rubber which is long enough to cover the entire axial length of the elastomeric annular member and a short portion of the cable extending there beyond, is formed around the cable at a location near the elastomeric annular member and in snug engagement with the cable.
  • the synthetic rubber sleeve is then slid up the cable toward the supporting member to surround the elastomeric member which is adjacent thereto. This step inherently stretches the sleeve, thereby increasing its tension level, and it also inherently compresses the elastomeric annular member, thereby improving the seal between it and the joint formed between the annular member and the cable.
  • the sleeve is then preferably mechanically restrained in place by circumscribing it by a high tensile strength plastic band or strap, and the spiral wrapping of the cable, as previously described, is begun, with the spiral wrapping preferably extending from the surface of the cable supporting stanchion and thereby overlying the synthetic rubber sleeve and the elastomeric member that is surrounded thereby.
  • an object of the present invention to provide an improved weather-resistant wrap of a large, lengthy outdoor tubular article, such as a suspension bridge cable, and to provide a method for applying such a wrap to such an article.
  • This object is solved according to the features of claims 1 and 12. More specifically, it is an object of the present invention to provide a properly precolored wrap of the foregoing character to such an article to eliminate the need to paint such wrap after it is in place on the article. It is also an object of the present invention to provide a multiple layer wrap of the foregoing character whose superimposed layers can be bonded to one another by heat sealing, without the use of a solvent and the material handling and disposal problems which are attendant thereto.
  • FIG. 1 illustrates a section of an elongate tubular member 10, illustratively a cable of a suspension bridge or a cable-stayed bridge, which is normally used in a relatively inaccessible outdoor location and is subject to corrosion and other forms of deterioration that are likely to result from its exposure to outdoor climatic conditions.
  • a suspension bridge such tubular member 10 is used to enclose and restrain the radial movement of a longitudinally extending tensile load bearing member 12, which is typically made up of an array of individual steel cables.
  • the tubular member 10 typically is supported at various locations along its length by vertical support members, such as an annular member 14, which is fragmentarily illustrated in Fig. 1, a member which is usually referred to as a saddle or a stanchion in a suspension bridge.
  • tubular member 10 is illustrated as a unitary element, typically in a suspension bridge it will be formed by spirally wrapping a galvanized outer steel cable around the load bearing member 12, with adjacent winds of the spirally wrapped member in surface to surface contact with one another.
  • the exterior of the tubular member has previously been painted, usually with a lead-based paint. Nevertheless, the wrap 16 can be applied over a painted tubular member 10, whatever the condition of its painted surface, and this can be done without disturbing the condition of the painted surface.
  • the outer surface of the tubular member 10 is protected from exposure to climatic conditions by encapsulating it along its length extending from the support member 14 to the next support member, not shown, by an outer wrap 16 and by providing a seal, indicated generally by reference 18, to seal the joint formed between the support member and 14 and the tubular member 10.
  • the outer wrap 16 is formed by spirally wrapping a strand S of indefinite length from a roll or coil R thereof around the tubular member 10, as is generally indicated in Fig. 3.
  • the strand S is a flexible organic material which is of a suitable weather resistent composition, and is preferably applied under tension to ensure that it will snugly engage the exterior of the tubular member 10.
  • the strand S is applied with a substantial overlap between adjacent winds, preferably an overlap equal to one-half of the width of the strand S, to permit proper sealing of the seam formed by adjacent winds of the strand S and to provide a substantially uniform, double thickness wrap along the tubular member 10.
  • the wrap 16 serves to effectively encapsulate any lead-based paint that is already applied to the tubular member 10, thereby eliminating a potential environmental contamination problem.
  • the strand S is illustrated in cross-section in Fig. 3, and preferably is made up of a laminate of inner and outer layers S1 and S2 with a scrim or screen S3 of a relatively high tensile strength material imbedded therebetween.
  • each of the layers S1 and S2 is formed in a uniform thickness by calendaring or otherwise from a synthetic rubber material, such as that being sold by DuPont for roof covering and other uses under the brand name Hypalon.
  • a synthetic rubber material such as that being sold by DuPont for roof covering and other uses under the brand name Hypalon.
  • Such a material may be precolored in a wide variety of colors and shades of colors by blending a suitable amount of a proper colorant in the resin that is to be calendared.
  • the strand S is 6 inches wide
  • each Hypalon synthetic rubber strand S1 and S2 is 0.015 (15 mil) inch thickness
  • the scrim S3 is a 250 denier 8 by 8 polyester scrim.
  • Each wind of such material as nearly as exactly as possible overlaps one-half of the width of the preceding wind.
  • this heating step may be done conductively by an internally heated electric blanket B and by progressively advancing the blanket B along the wrap 16 after it is in place on the tubular member 10.
  • the heat sealing step can be performed by advancing an annular radiant heater along the wrap 16 on the tubular member 10.
  • the seal 18 may be formed in an appropriate manner, but in the preferred embodiment of the present invention it is formed by joining opposed ends of a generally wedge-shaped Neoprene material or other elastic material extrusion E, Fig. 4, into an annular member 20.
  • the annular member 20 snugly engages an annular portion of the outside surface of the tubular member 10, and the thicker end of the annular member 20 snugly engages an end surface of the support member 14 in an annular pattern.
  • the opposed ends of the extrusion E are preferably adhesively joined to one another to form the annular member 20.
  • annular member 20 is in place with respect to the tubular member 10 and the support member 14, it is preferably secured in such place by tightly circumscribing it with a high tensile strength plastic band or strap 22, such as a "Delrim” brand polyoxymethylene (POM) band or strap, an annular notch 24 being formed in the exterior of the annular member 20 to receive the band or strap 22.
  • a high tensile strength plastic band or strap 22 such as a "Delrim” brand polyoxymethylene (POM) band or strap
  • annular sleeve 26 is formed snugly around a portion of the tubular member 10 which is immediately beyond the annular member 20.
  • the sleeve 26 is formed from a stretchable organic material, preferably Hypalon brand synthetic rubber, and after it is formed it is advanced toward the support member 14 to surround the annular member 20. As shown, the sleeve 26 has sufficient axial length to cover the entire axial length of the annular member 20 as well as a portion of the support member 10 which extends there beyond.
  • the advancing of the sleeve 26 toward the support member 14 will stretch and increase the tension in the portion of the sleeve 26 which overlies the annular member 20, thereby compressing the annular member 20 into tight sealing engagement with the support member 14 and the portion of the tubular member 10 which the annular member 20 surrounds.
  • a second high tensile strength plastic band or strap 28 such as a "Delrim” brand POM band or strap, an outwardly projecting annular bead 30 being formed in the exterior of the annular member 20 to axially position the band or strap 28 relative to the support member 14.
  • the outer wrap 16 is formed on the tubular member 10, preferably beginning at the support member 14 and thereby serving to wrap the exterior of the sleeve 26 and cover the band or strap 28.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Ropes Or Cables (AREA)
  • Bridges Or Land Bridges (AREA)
EP19950300215 1995-01-13 1995-01-13 Suspension bridge cable wrap and application method Expired - Lifetime EP0722015B1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
DE1995603749 DE69503749T2 (de) 1995-01-13 1995-01-13 Umhüllung für Kabel von Hängebrücken und Verfahren zu deren Herstellung
EP19950300215 EP0722015B1 (en) 1995-01-13 1995-01-13 Suspension bridge cable wrap and application method
DK95300215T DK0722015T3 (da) 1995-01-13 1995-01-13 Omvikling til kabler i hængebroer og fremgangsmåde til påføring
HK98113238.8A HK1012034B (en) 1998-12-11 Suspension bridge cable wrap and application method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19950300215 EP0722015B1 (en) 1995-01-13 1995-01-13 Suspension bridge cable wrap and application method

Publications (2)

Publication Number Publication Date
EP0722015A1 EP0722015A1 (en) 1996-07-17
EP0722015B1 true EP0722015B1 (en) 1998-07-29

Family

ID=8221053

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19950300215 Expired - Lifetime EP0722015B1 (en) 1995-01-13 1995-01-13 Suspension bridge cable wrap and application method

Country Status (3)

Country Link
EP (1) EP0722015B1 (da)
DE (1) DE69503749T2 (da)
DK (1) DK0722015T3 (da)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006007658A1 (en) * 2004-07-21 2006-01-26 S2 Holdings Pty Limited A structural member and a method for forming a structural member

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2790493B1 (fr) * 1999-03-01 2001-09-14 Baudin Chateauneuf Protection des faisceaux de cables par bande thermoretractable, notamment avec levres et glissiere
FR2790492A1 (fr) * 1999-03-01 2000-09-08 Baudin Chateauneuf Cables enveloppes d'une bande en materiau thermoretractable
CN102953332B (zh) * 2011-08-27 2015-09-30 上海浦江缆索股份有限公司 全密封型拉索及其使用方法
CN105256722A (zh) * 2015-10-28 2016-01-20 梁振西 一种斜拉桥用复合防护层耐腐蚀拉索及钢丝制备方法
CN107326806A (zh) * 2017-08-28 2017-11-07 南京工业大学 一种刚柔组合复合材料主缆防护系统
CN111434599A (zh) * 2019-01-15 2020-07-21 北京橡胶工业研究设计院有限公司 一种多层复合主缆防护缠包带

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH550675A (de) * 1971-04-29 1974-06-28 Polygest Ag Verfahren zur herstellung von ueberzuegen aus polytetrafluoraethylen und nach diesem verfahren hergestellte produkte.
US3789594A (en) * 1972-06-06 1974-02-05 United States Steel Corp Wrapping apparatus
BR8807614A (pt) * 1987-07-13 1990-05-29 Russell N Dashow Fita laminada e aplicacao da mesma

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006007658A1 (en) * 2004-07-21 2006-01-26 S2 Holdings Pty Limited A structural member and a method for forming a structural member

Also Published As

Publication number Publication date
EP0722015A1 (en) 1996-07-17
DK0722015T3 (da) 1999-05-03
DE69503749T2 (de) 1998-12-03
DE69503749D1 (de) 1998-09-03
HK1012034A1 (en) 1999-07-23

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