WO2008150856A1 - Câble à utiliser dans une barrière de sécurité - Google Patents

Câble à utiliser dans une barrière de sécurité Download PDF

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Publication number
WO2008150856A1
WO2008150856A1 PCT/US2008/065070 US2008065070W WO2008150856A1 WO 2008150856 A1 WO2008150856 A1 WO 2008150856A1 US 2008065070 W US2008065070 W US 2008065070W WO 2008150856 A1 WO2008150856 A1 WO 2008150856A1
Authority
WO
WIPO (PCT)
Prior art keywords
cable
plastic core
core wire
wire rope
metal wires
Prior art date
Application number
PCT/US2008/065070
Other languages
English (en)
Inventor
Peter Bergendahl
Original Assignee
Trinity Industries, Inc.
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 Trinity Industries, Inc. filed Critical Trinity Industries, Inc.
Publication of WO2008150856A1 publication Critical patent/WO2008150856A1/fr

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01F—ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE
    • E01F15/00—Safety arrangements for slowing, redirecting or stopping errant vehicles, e.g. guard posts or bollards; Arrangements for reducing damage to roadside structures due to vehicular impact
    • E01F15/02—Continuous barriers extending along roads or between traffic lanes
    • E01F15/06—Continuous barriers extending along roads or between traffic lanes essentially made of cables, nettings or the like
    • E01F15/065—Continuous barriers extending along roads or between traffic lanes essentially made of cables, nettings or the like the barrier members being made of essentially non-metallic materials, e.g. natural or synthetic fibres or webbing
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B1/00—Constructional features of ropes or cables
    • D07B1/06—Ropes or cables built-up from metal wires, e.g. of section wires around a hemp core
    • D07B1/0673—Ropes or cables built-up from metal wires, e.g. of section wires around a hemp core having a rope configuration
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B1/00—Constructional features of ropes or cables
    • D07B1/06—Ropes or cables built-up from metal wires, e.g. of section wires around a hemp core
    • D07B1/0693—Ropes or cables built-up from metal wires, e.g. of section wires around a hemp core having a strand configuration
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01F—ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE
    • E01F15/00—Safety arrangements for slowing, redirecting or stopping errant vehicles, e.g. guard posts or bollards; Arrangements for reducing damage to roadside structures due to vehicular impact
    • E01F15/02—Continuous barriers extending along roads or between traffic lanes
    • E01F15/06—Continuous barriers extending along roads or between traffic lanes essentially made of cables, nettings or the like
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2201/00—Ropes or cables
    • D07B2201/20—Rope or cable components
    • D07B2201/2015—Strands
    • D07B2201/2023—Strands with core
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2201/00—Ropes or cables
    • D07B2201/20—Rope or cable components
    • D07B2201/2015—Strands
    • D07B2201/2024—Strands twisted
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2201/00—Ropes or cables
    • D07B2201/20—Rope or cable components
    • D07B2201/2015—Strands
    • D07B2201/2038—Strands characterised by the number of wires or filaments
    • D07B2201/2039—Strands characterised by the number of wires or filaments three to eight wires or filaments respectively forming a single layer
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2201/00—Ropes or cables
    • D07B2201/20—Rope or cable components
    • D07B2201/2047—Cores
    • D07B2201/2066—Cores characterised by the materials used
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2201/00—Ropes or cables
    • D07B2201/20—Rope or cable components
    • D07B2201/2047—Cores
    • D07B2201/2067—Cores characterised by the elongation or tension behaviour
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2205/00—Rope or cable materials
    • D07B2205/20—Organic high polymers
    • D07B2205/201—Polyolefins
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2401/00—Aspects related to the problem to be solved or advantage
    • D07B2401/20—Aspects related to the problem to be solved or advantage related to ropes or cables
    • D07B2401/2005—Elongation or elasticity

Definitions

  • the present disclosure is related to highway barriers and safety systems and more particularly to cable safety systems and associated cables.
  • Cable safety systems and cable barriers have been installed along edges of roadways and highways for many years. Cable safety systems and cable barriers have also been installed along medians between roadways and/or highways. Cable safety systems generally include one or more horizontal cables attached to support posts. For some applications cable safety systems and cable barriers may reduce damage to an impacting vehicle and/or injury to occupants of the impacting vehicle as compared with other types of highway safety systems and highway barriers .
  • Cable safety systems are often designed and installed with at least one cable mounted horizontally on a plurality of generally vertical support posts. Many cable safety systems include three cables spaced vertically from each other on each support post. The number of cables may vary depending on factors such as the type of vehicles using the associated roadway and the hazard which requires installation of the cable safety system. The length of a cable safety system is generally determined based on the adjacent roadside hazard. Each cable is typically installed at a selected height relative to the ground and with selected vertical spacing between adjacent cables. During the past several years, cable safety systems have been used as an alternative to traditional W-beam or thrie-beam guardrail systems. Cable safety systems are often more aesthetically appealing and minimize potential sight distance problems as compared with W-beam and thrie beam guardrail systems. Cable safety systems generally minimize snow accumulation on adjacent highways and roadways .
  • a cable safety system may be provided which overcomes many disadvantages and problems associated with prior cable safety systems and cable barriers.
  • a safety barrier installed adjacent to a roadway comprising includes a plurality of posts spaced from each other and disposed adjacent to the roadway, and at least one cable releasably engaged with and supported by the posts.
  • the cable may include a plastic core wire and a plurality of metal wires disposed adjacent to and longitudinally to the plastic core wire.
  • the cable may be pre-stretched prior to installation in the safety barrier.
  • a cable for use in a safety barrier may include a plastic core wire and a plurality of metal wires disposed adjacent to and longitudinally to the plastic core wire.
  • the cable may be pre-stretched prior to installation in the safety barrier.
  • a method of making cable for use in a safety barrier may include providing a plastic core wire.
  • a plurality of metal wires may each be disposed adjacent to and longitudinally to the plastic core wire.
  • the cable may be pre-stretched prior to installation in the safety barrier.
  • FIGURE Ia is a schematic drawing in elevation with portions broken away of a cable safety system, in accordance with the present disclosure
  • FIGURE Ib is a schematic drawing showing a plan view with portions broken away of the cable safety system of FIGURE Ia;
  • FIGURE Ic is a schematic drawing in elevation with portions broken away of another cable safety system incorporating teachings of the present disclosure
  • FIGURE Id is a schematic drawing in section and in elevation with portions broken away of a below ground cable anchor assembly satisfactory for use with the cable safety system of FIGURE Ic;
  • FIGURE 2 is a schematic drawing showing an isometric view with portions broken away of a post and cables, in accordance with the present disclosure
  • FIGURE 3a is a schematic drawing in section showing one example of a cable formed using a seven strand metal wire rope, in accordance with the present disclosure
  • FIGURE 3b is a schematic drawing in section depicting the forces that may be applied during an impact to individual wires of the wire rope of FIGURE 3a;
  • FIGURE 4a is a schematic drawing in section showing one example of a cable formed using a plastic core wire surrounded by a plurality of metal wires adjacent to and disposed longitudinally to the plastic core wire, in accordance with the present disclosure
  • FIGURE 4b is a schematic drawing in section depicting the forces that may be applied during an impact to the individual wires of the wire rope of FIGURE 4a
  • FIGURE 5a is a schematic drawing in section showing one example of a cable formed from three groups of seven strand metal wire rope, in according with the present disclosure
  • FIGURE 5b is a schematic drawing in section showing one example of a cable formed from three groups of wire rope, each of the three groups formed using a plastic core wire surrounded by a plurality of metal wires adjacent to and disposed longitudinally to the plastic core wire, in accordance with the present disclosure
  • FIGURE 5c is a schematic drawing in section showing one example of a cable formed from three groups of wire rope, wherein one of the three groups is formed using a plastic core wire surrounded by a plurality of metal wires adjacent to and disposed longitudinally to the plastic core wire, in accordance with the present disclosure .
  • safety system or “safety systems”, “safety barrier” or “safety barriers,” and “barrier” or “barriers” may be used throughout this application to include any type of safety system and/or barrier which may be formed at least in part using cables and support posts incorporating teachings of the present disclosure.
  • the term “roadway” may be used throughout this application to include any highway, roadway or path satisfactory for vehicle traffic.
  • Safety systems and barriers incorporating teachings of the present disclosure may be installed in median strips or along shoulders of highways, roadways or any other path which is likely to encounter vehicular traffic.
  • Cable safety systems 20 and 20a may have similar design features and characteristics except cable safety system 20 includes above ground anchors 24 and 26. Cable safety system 20a includes below ground anchors 24a and 2 ⁇ a.
  • the present disclosure is not limited to cable safety systems 20 and 20a as shown in FIGURES Ia - Id. Cable safety systems 20 and 20a may be installed adjacent to a roadway (not expressly shown) to prevent motor vehicles (not expressly shown) from leaving the roadway and to redirect vehicles away from hazardous areas without causing serious injuries to the vehicle's occupants or other motorists.
  • the general direction of traffic flow along the roadway is illustrated by directional arrow 22.
  • Cable safety systems 20 and 20a may be satisfactorily used as a median, a single barrier installation along the edge of a roadway and at merge applications between adjacent roadways. For some applications, cable safety systems 20 and 20a may satisfactorily withstand a second impact before repairs have been made after a first impact. For many applications, cable safety systems 20 and 20a may be described as generally maintenance free except for repairs required after a vehicle impact.
  • Cable safety systems 20 and 20a preferably include a plurality of support posts 30 anchored adjacent to the roadway.
  • Posts 30 may be anchored with the ground using various techniques.
  • a concrete foundation (not expressly shown) may be provided with holes to allow relatively quick and easy insertion and removal of parts.
  • the number, size, shape and configuration of posts 30 may vary significantly among various applications and installations.
  • Optimum spacing between posts 30 may also vary among various applications and installations. See, for example, United States Patent No. 6,962,328, granted November 8, 2005 and entitled "Cable Safety Systems,” which is incorporated by reference herein for all purposes.
  • Various types of cables and/or wire ropes may be satisfactorily used to form a cable safety system in accordance with teachings of the present disclosure.
  • Cables 160a, 160b and 160c may be substantially identical. However, for some applications each cable of a cable safety system formed in accordance with teachings of the present disclosure may have different characteristics. Cable safety systems 20 and 20a may be generally described as flexible, substantially maintenance free systems with designed low deflection of cables 160a, 160b, and 160c during a vehicle impact. Forming cable safety systems 20 and 20a in accordance with teachings of the present disclosure minimizes damage during a vehicle impact with posts 30 and/or cables 160a, 160b and 160c. For some applications cables 160a, 160b and 160c may be formed from seven strand wire rope, e.g. cable 170 as depicted in FIGURE 3a.
  • a plurality of cables 160a, 160b and 160c may be attached to support posts 30 in accordance with teachings of the present disclosure.
  • Support posts 30 generally maintain associated cables 160a, 160b and 160c in substantially horizontal positions extending along an edge of the roadway. Support posts 30 often allow relative quick and easy repair of cable safety systems 20 and 20a after a vehicle impact.
  • Cable safety systems 20 and 20a are generally relatively narrow as compared to conventional W-beam and thrie beam guardrail systems.
  • the length of cables 160a, 160b and 160c may be up to 3,000 meters between anchors 24 and 26 or anchors 24a and 2 ⁇ a. For other applications the length of cable 160a, 160b and 160c may exceed 3,000 meters without an intermediate anchorage.
  • Support posts 30 maintain desired vertical spacing between cables 160a, 160b and 160c and desired vertical spacing of each cable relative to the ground.
  • Cable safety system 20 and 20a including support posts 30 formed in accordance with teachings of the present disclosure may be designed in accordance with teachings of the present disclosure to meet or exceed the criteria of NCHRP Report 350 Level 3 requirements .
  • Cable safety systems 20 and 20a preferably include cables 160a, 160b and 160c disposed in slot 40 of each post 30. Cable 160a, 160b and 160c are preferably disposed at different heights relative to the ground and relative to each other. Varying the vertical spacing between cables 160a, 160b and 160c often provides a much wider lateral catch area for vehicles impacting with cable safety systems 20 and 20a. The vertical spacing between cables 160a, 160b and 160c may be selected to satisfactorily contain both pickups and, to some extent, even larger vehicles with a relatively high center of gravity, as well as vehicles with a low front profile and low center of gravity.
  • Cables 160a, 160b and 160c may be prefabricated in approximately three hundred (300) meter lengths with desired fittings attached with opposite ends of each cables 160a, 160b and 160c. Tailor made cables 160a, 160b and 160c may then be delivered to a desired location for installation adjacent to a roadway. Alternatively, cables 160a, 160b, and 160c may be formed from a single cable stored on a large drum (not expressly shown) . Cables stored on drums may often exceed three thousand (3,000) meters in length. Cables 160a, 160b, and 160c may be cut in desired lengths from the cable stored on the drum.
  • Cables 160a, 160b and 160c may be installed between anchors 24 and 26 or anchor 24a and 26a with approximately twenty thousand Newtons of tension over a length of approximately three thousand (3,000) meters .
  • FIGURE Id shows one example of a below ground anchor which may be satisfactorily used with a cable safety system incorporating teachings of the present disclosure.
  • Respective holes 27 may be formed in the ground at desired locations for anchors 24a and 26a. A portion of each hole 27 may be filled with concrete foundation 28.
  • Anchor plate 29 may be securely engaged with concrete foundation 28 using various types of mechanical fasteners, including, but not limited to, a plurality of bolts 23 and nuts 24. Anchor plate 29 may be formed at an appropriate angle to accommodate the design of cable safety system 20a. Also multiple slots and/or openings
  • anchor plate 29 may be formed in anchor plate 29 to receive respective end fittings 64.
  • end fitting 64a of cable 160a is shown engaged with anchor plate 29.
  • Various types of anchor assemblies and cable end fittings may be satisfactorily used with a cable safety system incorporating teachings of the present disclosure.
  • the present disclosure is not limited to anchor 24a or end fittings 64a as shown in FIGURE Id.
  • One example of support posts 30 and cables 160a, 160b and 160c which may be satisfactorily used to form cable safety system 20 in accordance with teachings of the present disclosure is shown in FIGURE 2.
  • Post 30 includes first end 31 and second end 32.
  • post 30 includes a generally C-shaped cross section defined in part by web 34 with respective legs 35 and 36 extending therefrom.
  • each leg 35 and 36 opposite from web 34 may be rounded or bent inward to eliminate any sharp edges.
  • Support post 30 may also have a generally "rounded” or “soft” profile.
  • post 30 may be formed using roll forming techniques .
  • Slot 40 is preferably formed in web 34 extending from first end 31 towards second end 32.
  • the length of slot 40 may be selected in part based on desired vertical spacing of cable 160c relative to the adjacent roadway.
  • the length of slot 40 may also be selected to accommodate the number of cables which will be installed therein and desired vertical spacing between each cable.
  • Slot 40 may have a generally elongated U-shaped configuration defined in part by first edge 41, second edge 42 and bottom (not expressly shown) .
  • first edge 41 and second edge 42 may have a generally smooth profile and extend generally parallel with each other.
  • Forming slot 40 within web 34 of post 30 eliminates requirements for bolts, hooks or other mechanical attachments to releasably secure cables 160a, 160b and 160c with post 30.
  • Further examples of support posts 30 and cables 160a, 160b, and 160c that may be used to form cable safety system in accordance with the present disclosure may be set forth United States Patent No. 6,962,328, discussed above.
  • FIGURE 3a is a schematic drawing in section showing one example of a cable 170 for use in cable barrier system 20.
  • Cable 170 may comprise a metal core wire 71, and a plurality of metal wires 72 disposed adjacent to and longitudinally to metal core wire 71.
  • cable 170 may comprise a seven strand wire rope.
  • metal core wire 71 and/or metal wires 72 may comprise steel.
  • FIGURE 3b depicts the forces that may be applied during an impact to individual wires 71, 72 of cable 170 during a vehicle impact to cable safety system 20 comprising cable 170. As shown, a vehicle impact to cable safety system 20 may cause metal wires 72 to be forced towards metal core wire 71, thus decreasing the flexibility of cable 170.
  • a plastic core wire 73 may be substituted in place of metal core wire 71, as depicted in FIGURE 4a, forming cable 175.
  • cable 175 may include a plastic core wire 73 and a plurality of metal wires 72 disposed adjacent to and longitudinally to plastic core wire 73.
  • plastic core wire 73 may comprise polypropylene.
  • cable 175 may comprise six metal wires 72.
  • cable 175 may be manufactured or formed by methods similar to that of cable 170.
  • FIGURE 4b depicts the forces that may be applied during an impact to individual wires 72, 73 of cable 175 during a vehicle impact to cable safety system 20 comprising 175.
  • a vehicle impact to cable safety system 20 may cause some of metal wires 72 (e.g. metal wires 72d, 72e and 72f) to be forced towards plastic core wire 73, while other metal wires (e.g. metal wires 72a, 72b, and 72c) may be forced away from plastic core wire 73, due to the flexible nature of plastic core wire 73.
  • cable 175 may remain more flexible during a vehicle impact with cable safety system 20, and thus may be more resistant to breaking than a similarly- sized metal-wire-only cable 170.
  • cables comprising three groups of seven-strand wire may be used to form cable safety system 20.
  • FIGURE 5a depicts a cable 180 formed from three groups of seven strand metal wire rope, as is often used in conventional cable safety systems.
  • the metal wires 72 comprising each wire rope of cable 180 may be forced towards the metal core wire 71 of their respective wire rope, as depicted in FIGURE 3b, which may result in decreased flexibility.
  • a plastic core wire 73 may be substituted in place each wire rope' s metal core wire 71, as depicted in FIGURE 5b, forming cable 190.
  • cable 190 may include three wire ropes, each including a plastic core wire 73 and a plurality of metal wires 72 disposed adjacent to and longitudinally to the respective plastic core wires 73.
  • some of the metal wires 72 of each wire rope comprising cable 190 may be forced towards their respective plastic core wires 73, while other metal wires 72 may be forced away from their respective plastic cores wires, as depicted in FIGURE 4b. Accordingly, cable 190 may remain more flexible during a vehicle impact with cable safety system 20, and thus may be more resistant to breaking than a similarly-sized metal-wire- only cable 180.
  • cable safety system 20 may comprise three groups of seven strand wire ropes, wherein some of the groups may include a plastic core wire 73, while others may not, such as cable 195 depicted in FIGURE 5c.
  • cables are often pre-stretched to about 50% of designed or rated breaking strength in order to obtain a desired modulus of elasticity for the cable.
  • cables 170, 175, 180, 190 and 195 may be pre-stretched to between approximately 60% and approximately 70% of designed or rated breaking strength.
  • Such increased pre-stretching may reduce elasticity of the cable, thus decreasing the amount of deflection of the cable during a vehicle impact, as compared to a cable pre-stretched to 50% of its breaking strength.
  • increased prestretching to between 60% and approximately 70% of designed or rated breaking strength may permit use of smaller-diameter cables as compared to that of conventional cable safety systems, thus potentially reducing raw materials cost.
  • the second column of TABLE 1 depicts the wire diameter, cable diameter, tensile strength, minimum breaking load, and weight of metal for an example conventional cable 180 comprising three groups of seven- strand steel wire rope.
  • the third, fourth, and fifth each depict the same parameters for alternatively constructed cables having a similar minimum breaking load.
  • the third, fourth, and fifth columns respectively depict these same parameters for each of: (a) a 21 steel wire strand cable 180 similar to that depicted in FIGURE 5a pre-stretched to 60% to 70%, (b) a 20 steel wire, 1 plastic core wire cable 195 similar to that depicted in FIGURE 5c pre-stretched to 60% to 70%, and (c) a 18 steel wire, 3 plastic core wire cable 190 similar to that depicted in FIGURE 5b pre-stretched to 60% to 70%. From TABLE 1, it can be seen that by using pre-stretched cables, lighter steel strands, and plastic core wire strands, cables of similar minimum breaking load to that of conventional cables may be constructed using less metal, and therefore, may be less expensive to manufacture.

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  • Engineering & Computer Science (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Refuge Islands, Traffic Blockers, Or Guard Fence (AREA)

Abstract

L'invention propose un câble à utiliser dans une barrière de sécurité. Un câble à utiliser dans une barrière de sécurité peut comprendre un fil de noyau plastique et une pluralité de fils en métal disposée à côté du fil à noyau plastique et longitudinalement à celui-ci. Le câble peut être préétiré avant l'installation dans la barrière de sécurité. Un procédé de fabrication d'un câble à utiliser dans une barrière de sécurité peut comprendre: (a) la fourniture d'un fil de noyau plastique, (b) la disposition d'une pluralité de fils en métal, chaque fil en métal étant disposé à côté du fil de noyau plastique et longitudinalement à celui-ci, et (c) le préétirement du câble avant son installation dans la barrière de sécurité.
PCT/US2008/065070 2007-06-01 2008-05-29 Câble à utiliser dans une barrière de sécurité WO2008150856A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US11/756,730 US20080296546A1 (en) 2007-06-01 2007-06-01 Cable for use in safety barrier
US11/756,730 2007-06-01

Publications (1)

Publication Number Publication Date
WO2008150856A1 true WO2008150856A1 (fr) 2008-12-11

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PCT/US2008/065070 WO2008150856A1 (fr) 2007-06-01 2008-05-29 Câble à utiliser dans une barrière de sécurité

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WO (1) WO2008150856A1 (fr)

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JP6231758B2 (ja) * 2013-04-02 2017-11-15 積水樹脂株式会社 標示体
WO2015033100A1 (fr) * 2013-09-05 2015-03-12 Robert Gerrard Barrière de sécurité
CN104464282B (zh) * 2014-10-31 2016-09-21 苏州朗米尔照明科技有限公司 一种智能自动借道控制系统
KR20170125344A (ko) 2015-02-27 2017-11-14 쓰리엠 이노베이티브 프로퍼티즈 컴파니 양면 코팅 테이프
US12037756B2 (en) 2015-04-22 2024-07-16 Neusch Innovations, Lp Post and beam vehicle barrier
US11198980B2 (en) * 2017-12-18 2021-12-14 Neusch Innovations, Lp Passive anti-ram vehicle barrier
CN112030828B (zh) * 2018-07-17 2021-11-05 合肥速纳工程设计有限公司 一种市政工程使用的公路护栏装置
CN112030829B (zh) * 2018-07-17 2021-10-08 王嘉炜 一种市政工程使用的可缓冲的公路护栏设备
JP7138251B2 (ja) * 2019-08-22 2022-09-15 朝日インテック株式会社 ワイヤロープ
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