WO2021009971A1 - Sealed wire rope inspection method, sealed wire repair method, and sealed wire rope - Google Patents

Sealed wire rope inspection method, sealed wire repair method, and sealed wire rope Download PDF

Info

Publication number
WO2021009971A1
WO2021009971A1 PCT/JP2020/012976 JP2020012976W WO2021009971A1 WO 2021009971 A1 WO2021009971 A1 WO 2021009971A1 JP 2020012976 W JP2020012976 W JP 2020012976W WO 2021009971 A1 WO2021009971 A1 WO 2021009971A1
Authority
WO
WIPO (PCT)
Prior art keywords
wire rope
hole
inspection
closed wire
coating
Prior art date
Application number
PCT/JP2020/012976
Other languages
French (fr)
Japanese (ja)
Inventor
金喜 山田
智 佐久間
典雅 東田
泰 長江
正浩 江崎
幸二 北川
康幸 甲斐
卓 矢島
Original Assignee
株式会社ネクスコ東日本エンジニアリング
川田工業株式会社
東京製綱株式会社
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 株式会社ネクスコ東日本エンジニアリング, 川田工業株式会社, 東京製綱株式会社 filed Critical 株式会社ネクスコ東日本エンジニアリング
Publication of WO2021009971A1 publication Critical patent/WO2021009971A1/en

Links

Images

Classifications

    • 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
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D22/00—Methods or apparatus for repairing or strengthening existing bridges ; Methods or apparatus for dismantling bridges
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M3/00—Investigating fluid-tightness of structures
    • G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M3/00—Investigating fluid-tightness of structures
    • G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
    • G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
    • G01M3/20—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M3/00—Investigating fluid-tightness of structures
    • G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
    • G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
    • G01M3/24—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using infrasonic, sonic, or ultrasonic vibrations
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M3/00—Investigating fluid-tightness of structures
    • G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
    • G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M3/00—Investigating fluid-tightness of structures
    • G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
    • G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
    • G01M3/28—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M3/00—Investigating fluid-tightness of structures
    • G01M3/38—Investigating fluid-tightness of structures by using light

Definitions

  • the present invention relates to an inspection method and a repair method for a covered sealed wire rope used for a bridge, and a covered sealed wire rope used for a bridge.
  • Patent Document 1 discloses a technique relating to a leak tester for a coating material for cable rust prevention.
  • a sealed wire rope that is sealed by covering a steel wire or a wire rope is used from the viewpoint of corrosion prevention and the like.
  • Such a sealed wire rope is basically maintenance-free, but for example, the coating may be damaged (small holes are made) due to the heat of a lightning strike, and after a certain period of time, etc.
  • Patent Document 1 is a technique on the premise that a location where a leak is foreseen is known in advance. That is, at the place where the cable band 3 is provided, a closed space portion is formed by using a sheet that airtightly covers the corresponding portion, and the inside of the closed space portion is pressurized to detect the presence or absence of a leak. Therefore, when considering the use of the technique of Patent Document 1 for inspecting a closed wire rope in which it is not known where the penetration scratches of the coating are, "a sheet for airtightly covering all parts of the wire rope is applied in order.
  • the present invention is a method for inspecting a covered wire rope used for a bridge, which can improve work efficiency and reduce the need for traffic regulation. It is an object of the present invention to provide a method for inspecting a closed wire rope.
  • (Structure 1) A method for inspecting a sealed wire rope with a coating used for a bridge, wherein a through hole for inspection is formed in the coating of the sealed wire rope, and the through hole for inspection is used to form the sealing type. Whether or not there is a penetration scratch in the coating of the closed wire rope is determined by the step of pressurizing or depressurizing the inside of the wire rope coating and whether or not the pressurizing or depressurizing state is maintained.
  • a method of inspecting a sealed wire rope characterized by having steps and. According to the inspection method of the configuration 1, it is possible to inspect whether or not there is a penetration scratch in the coating of the sealed wire rope without restricting the traffic of the bridge.
  • (Structure 2) A method for inspecting a sealed wire rope with a coating used for a bridge, wherein a through hole for inspection is formed in the coating of the sealed wire rope, and the through hole for inspection is used to form the sealing type. It is characterized by having a step of pressurizing or depressurizing the inside of the wire rope coating, and a step of determining whether or not there is a penetrating scratch on the sealing wire rope coating depending on the presence or absence of leakage noise. How to inspect the sealed wire rope.
  • (Structure 4) A method of inspecting a covered sealed wire rope used for a bridge, in which a step of forming a through hole for inspection in the coating of the sealed wire rope and a through hole for inspection are performed by an imaging device. Depending on the step of injecting the detection gas that can be imaged and whether or not the leakage of the detection gas to the outside of the coating of the closed wire rope is imaged by the imaging device, the coating of the closed wire rope is covered.
  • a method of inspecting a closed wire rope characterized in that it has a step of determining whether or not there is a penetrating scratch.
  • a through hole for inspection is formed on the lower side of the closed wire rope installed on the bridge, and intake is performed from the through hole for inspection to inside the coating of the closed wire rope.
  • the through hole for inspection is formed at a position in the range of 90 ° to 170 ° when the upper end portion is 0 ° and the lower end portion is 180 ° in the cross-sectional view of the closed wire rope.
  • the method for inspecting a closed wire rope according to any one of the features 1 to 8.
  • (Structure 13) A method for repairing a closed wire rope performed after the method for inspecting a closed wire rope according to any one of configurations 10 to 12, wherein the step for repairing the penetrating scratch and the through hole for the inspection are separated.
  • a method for repairing a closed wire rope which comprises a step of closing a through hole for air supply and exhaust, and a step of closing the through hole.
  • the step of closing the through hole for inspection and the through hole for air supply / exhaust is performed by attaching an opening / closing member capable of opening / closing the through hole to the through hole for inspection and the through hole for air supply / exhaust.
  • the through hole for air supply / exhaust shall be formed at a position in the range of 90 ° to 170 ° when the upper end portion is 0 ° and the lower end portion is 180 ° in the cross-sectional view of the sealed wire rope.
  • (Structure 18) A closed wire rope using the method for inspecting a closed wire rope according to any one of configurations 1 to 12, wherein a through hole for inspection is previously formed in the coating of the closed wire rope.
  • a sealed wire rope characterized by being provided with an opening / closing member capable of opening / closing the through hole for inspection.
  • the present invention it is possible to improve the efficiency of the work of the inspection method of the covered sealed wire rope used for the bridge, and to reduce the necessity of traffic regulation at the time of the inspection work. ..
  • Sectional view of closed wire rope Schematic showing another example of how to inspect a closed wire rope Explanatory drawing for draining water collected in a closed wire rope
  • Explanatory drawing for draining water collected in a closed wire rope Schematic diagram showing a state of performing air supply drying in the method of repairing a closed wire rope according to the embodiment.
  • Explanatory drawing about opening and closing member which can open and close through hole for inspection or through hole for air supply and exhaust Explanatory drawing about opening and closing member which can open and close through hole for inspection or through hole for air supply and exhaust
  • FIG. 1 is a schematic view showing an example of a bridge (cable-stayed bridge) to which the inspection method of the closed wire rope of the present embodiment is performed, and FIG. 1 (a) shows an outline of the configuration of the cable-stayed bridge 100.
  • FIG. 1B is a schematic view showing only one of the sealed wire ropes 10.
  • the sealed wire rope 10 has a structure in which the wire rope is sealed inside by coating the steel wire or the wire rope with high-density polyethylene or the like and processing sockets (sockets 11 and 12) at both ends. There is.
  • FIG. 3 shows a cross-sectional view of an example of the closed wire rope 10.
  • the galvanized steel wire 13 is focused in parallel, twisted at a pitch that does not reduce the strength and elastic modulus, and wound with the filament tape 15 on the twisted wire rope 10. It is coated with high-density polyethylene 14. Since the coated parallel wire strand is used as an example here, the filament tape 15 is provided. However, for example, when the wire rope or the single wire steel wire is coated, the filament tape 15 is unnecessary. is there.
  • the main girder 102 is inspected for whether or not there is a penetration scratch in the coating of the closed wire rope 10.
  • a through hole H1 for inspection is formed in the coating of the sealed wire rope 10.
  • the through hole H1 for inspection is opened with respect to the coating of the closed wire rope 10 in the main girder 102. That is, it is formed on the lower side (near the lowest place) of the closed wire rope 10 installed on the cable-stayed bridge 100.
  • the through hole H1 for inspection is formed at a position in the range of 90 ° to 170 ° when the upper end portion is 0 ° and the lower end portion is 180 ° in the cross-sectional view of the closed wire rope 10. (See FIG. 3).
  • the through hole H1 for inspection is formed in the main girder 102, the problem of rainwater intrusion is not so large, but due to the structure of the bridge or the like, the through hole H1 for inspection is formed in the open-air location. As shown in FIG. 3, the formation position of the through hole H1 for inspection is set in the range of 90 ° to 170 ° to reduce the intrusion of rainwater from the through hole H1 for inspection. It can be done.
  • FIG. 2 is a schematic view showing a state in which inspection equipment is installed.
  • the air supply / intake passage (pipe or the like) 1 is airtightly connected to the through hole H1 for inspection
  • the vacuum pump 2 is connected to the air supply / intake passage 1
  • the pressure gauge 3 is installed on the air supply / intake passage 1.
  • the through hole H2 is formed in the coating of the closed wire rope 10, and the pressure in the coating of the closed wire rope 10 is directly applied to the through hole H2.
  • the pressure gauge 4 for measuring is installed in, the through hole H2 and the pressure gauge 4 are not indispensable.
  • the vacuum pump 2 is driven to reduce the pressure inside the coating of the closed wire rope 10.
  • Check the pressure gauge 3 or pressure gauge 4
  • the pressure gauge 3 or pressure gauge 4
  • the pressure gauge 3 or the pressure gauge 4
  • the pressure gauge 3 or the pressure gauge 4
  • the pressure gauge 3 or the pressure gauge 4
  • the coating of the sealed wire rope 10 is judged to have a penetrating scratch. Judged.
  • the through hole H1 for inspection can be formed at the lowest position of the closed wire rope 10, but in reality, the existence of the socket formed at the end of the rope and the main girder of the socket are present. It is difficult to form it at the lowest position depending on the engagement with the structure on the side. For example, when a through hole H1 for inspection is made at a position illustrated in FIG. 5, water is automatically drained from the through hole H1 for inspection until the water level reaches WL, but water below the water level WL is automatically discharged. Separate drainage work is required.
  • the drainage work is performed from the through hole H1 for inspection to the lowest possible position of the sealed wire rope 10 in the gap (see FIG. 3) between the steel wire 13 and the coating 14 (filament tape 15).
  • This can be done by inserting the tube Tb and sucking and removing the water W using a syringe Sy (FIG. 6 (a)).
  • the water level WL of the water W is raised by injecting a fluid having a specific gravity heavier than that of the water W from the through hole H1 for inspection, and the water W is discharged from the through hole H1 for inspection. There is a way.
  • substitution liquid which is a “fluid having a specific gravity heavier than that of water W”
  • an inert liquid such as a fluorine-based inert liquid that does not corrode the steel wire 13 is used.
  • the replacement liquid is injected using a tube Tb, a syringe Sy, or the like, as in FIG. 6A. If water comes out when the through hole H1 for inspection is formed, it is clear that water is accumulated inside, but if water does not come out from the through hole H1 for inspection, it is clear. , It is necessary to confirm whether water is accumulated at a position lower than the through hole H1 for inspection (confirmation of water retention).
  • the water accumulated inside the closed wire rope 10 may be collected and the water content of the closed wire rope 10 may be investigated.
  • the corrosive state of the steel wire 13 and the degree of the corroded environment are estimated.
  • the state of the wire and rust preventive film (plating) is evaluated by the content of iron and zinc, and the corrosive environment is evaluated by the pH value and the content of chloride ions.
  • the local environmental water (rainwater and atmospheric moisture) together with the stagnant water it can be used to estimate the infiltration state and intrusion location of water.
  • the inspection method of the closed wire rope of the present embodiment it is possible to improve the efficiency of the inspection work for the presence or absence of penetrating scratches on the covered closed wire rope used for the bridge.
  • the work can be performed in a place that does not affect the traffic of the bridge, such as inside the main girder 102, there is no need to regulate the traffic of the bridge in order to perform the work, and economic activities and economic activities Not only can the impact on people's lives be reduced, but the time available for inspection work is also high.
  • an inspection method such as a visual inspection, it is necessary to inspect the entire length of the rope, so that the traffic of the bridge must be regulated in order to carry out the work.
  • a through hole H1 for inspection is formed on the lower side of the closed wire rope 10, and in order to take in air from this through hole H1, the moisture in the closed wire rope 10 is collected on the lower side of the rope. It is preferable because the effect of making the water drain from the through hole H1 for inspection becomes more efficient.
  • FIG. 4 shows an installation example of the equipment when the inside of the coating of the closed wire rope 10 is pressurized.
  • a gas cylinder 5 for example, a CO 2 cylinder
  • Others are basically the same as the configuration of FIG. 2 (the air valve 7 and the pressure reducing valve 6 are described, but they are not different in concept).
  • the valve (and air valve 7) of the gas cylinder 5 is opened to pressurize the inside of the coating of the sealed wire rope 10.
  • the pressure gauge 3 (or pressure gauge 4), pressurize to a pressure 1.5 ⁇ 10 4 Pa or more higher than the atmospheric pressure (adjusted by the pressure reducing valve 6), and close the air valve 7. In this state, it is confirmed by the pressure gauge 3 (or the pressure gauge 4) whether or not the pressurized state is maintained within a predetermined value for a certain period of time (for example, 10 minutes or more). If the pressurized state is maintained for a certain period of time, it is determined that there are no penetrating scratches on the coating of the sealed wire rope 10, and if the pressurized state is not maintained, there are penetrating scratches on the coating of the sealed wire rope 10. It is judged that there is.
  • CO 2 is taken as an example of the gas to be supplied into the closed wire rope 10, the present invention is not limited to this. Any gas can be used as long as it does not affect the wire and coating of the wire rope and has low flammability and toxicity assuming that it is exhausted into the girder or main tower. Air may be supplied using a compressor or the like.
  • the leak sound detection method in order to detect the leak sound, when pressurizing or depressurizing the closed wire rope, pressurization or depressurization is performed so that the pressure difference from the atmospheric pressure near the leak point is 8 ⁇ 10 3 Pa or more. It is preferable to do. From the experiment, it was confirmed that the leaked sound can be detected when the differential pressure from the atmospheric pressure in the vicinity of the leaked part is 8 ⁇ 10 3 Pa.
  • the experiment was performed on a closed wire rope 10 having a coating 14 thickness of 10 mm and a diameter of 139 mm (the diameter of the cable excluding the coating was 119 mm).
  • the pressure difference from the atmospheric pressure in the vicinity of the leak point is 8 ⁇ 10 3 Pa or more.
  • the pressure difference from the atmospheric pressure on the high side of the closed wire rope 10 should be 8 ⁇ 10 3 Pa or more. It is good to set it to.
  • the differential pressure from the atmospheric pressure for enabling the detection of the leaked sound is filled in the vicinity of the place farthest from the through hole H1 for inspection for pressurizing or depressurizing.
  • a through hole H3 is formed on the high side (near the highest point) of the closed wire rope 10, and a pressure gauge 4-2 is installed in the through hole H3.
  • the pressure difference from the atmospheric pressure in the measured value here should be 8 ⁇ 10 3 Pa or more.
  • the through hole H3 can be used as the through hole H3 for air supply / exhaust described in the second embodiment. Similar to the through hole H1 for inspection, the through hole H3 is in the range of 90 ° to 170 ° when the upper end portion is 0 ° and the lower end portion is 180 ° in the cross-sectional view of the closed wire rope 10.
  • the sealed wire rope 10 is basically maintenance-free, and basically does not cause a large penetration scratch. That is, basically, the main purpose is to detect small penetrating scratches, and to detect the leakage sound of gas generated in such small penetrating scratches.
  • the method using the detection gas is an imaging device that uses a gas that has the property of absorbing electromagnetic waves in a certain wavelength band and a gas that has the property of reflecting or emitting electromagnetic waves in a certain wavelength band and has imaging sensitivity for each wavelength band.
  • the detection gas a colored gas is used and a normal optical camera or a gas that visually detects the presence or absence of gas leakage, or a CO 2 gas is used and an infrared camera for carbon dioxide detection is used.
  • a detection gas a colored gas is used and a normal optical camera or a gas that visually detects the presence or absence of gas leakage, or a CO 2 gas is used and an infrared camera for carbon dioxide detection is used.
  • Those that detect the presence or absence of gas leakage those that detect the presence or absence of gas leakage by infrared thermography using an arbitrary heated gas, and the like.
  • the position can be determined in addition to the presence or absence of the penetrating scratch.
  • the method of repairing the closed wire rope of the present embodiment is carried out when it is determined by the inspection method of the closed wire rope of the first embodiment that there is a penetration scratch.
  • the method of repairing the closed wire rope of the present embodiment is roughly different from the step of repairing the penetrating scratch and the through hole H1 for inspection, and the through hole H3 for air supply / exhaust on the coating of the closed wire rope 10.
  • a step of ventilating between the through hole H1 for inspection and the through hole H3 for air supply / exhaust, and a step of closing the through hole H1 for inspection and the through hole H3 for air supply / exhaust. Have. Hereinafter, they will be described in order.
  • the location of the penetrating scratch is first specified.
  • Examples of the location of the penetrating wound include the following methods. 1. 1. A detection fluid (basically a gas) is supplied from the through hole H1 for inspection, and the detection fluid leaking from the through scratch is detected. It is basically the same as the "method using detection gas" mentioned in the first embodiment. If the position of the penetrating scratch has already been specified by using the "method using a detection gas" in the inspection method of the first embodiment, re-operation is not particularly necessary, but the location of the penetrating scratch is determined.
  • a self-propelled device equipped with an imaging device that moves along a rope, a drone, or the like may be used to identify the location where the detection gas is leaking. ..
  • a gas sensor that detects the detection gas may be mounted on a self-propelled device that moves along a rope, a drone, or the like to identify a location where the detection gas is leaking. .. 2. 2. Identify the location of penetrating scratches by leaking sound or wind pressure. For example, the leaked sound generated by supplying or sucking an arbitrary fluid (basically gas) can be checked by listening or using a device equipped with a microphone (self-propelled device moving along a rope, drone, etc.).
  • the wind pressure generated by supplying or sucking arbitrary gas is detected using a device equipped with a pressure sensor (self-propelled device moving along a rope, drone, etc.) to identify the location of the penetrating scratch.
  • a pressure sensor self-propelled device moving along a rope, drone, etc.
  • the leak check solution While supplying air to the through hole H1 for inspection, a leak check solution such as an effervescent solution is used to identify the location of the through scratch.
  • the penetrating scratch is repaired.
  • Repair of penetrating scratches is basically done by melting the coating and sealing it with a welding material of the same material, and where it is difficult to do this because it is done at a high place such as rope, fill with butyl rubber putty or melt seal the coating surface layer. Seal with.
  • a filament tape is wrapped to prevent it from coming off, and a self-bonding tape is wrapped to ensure weather resistance. If the covering through hole is small and the above repair is difficult, the circumference of the hole is excised and enlarged.
  • the inside of the closed wire rope 10 is depressurized by the method described in FIG. It can be assured. After repairing the penetrating scratch, it is confirmed whether or not there is a penetrating scratch by the inspection method of the first embodiment, and if there is a penetrating scratch, the above-mentioned work of identifying and repairing the penetrating scratch is performed again, and the penetrating scratch disappears. Then, prepare for ventilation and drying in the closed wire rope 10.
  • FIG. 7 is a schematic view showing a state in which the equipment for air supply drying in the closed wire rope 10 is installed.
  • the compressor 8 the pressure reducing valve 6, the air valve 7, the dehumidifier 9, Connect the filter F.
  • the hygrometer Hm1 is connected to the through hole H2 provided with the pressure gauge 4.
  • a through hole H3 for air supply / exhaust is formed on the high portion side of the closed wire rope 10, and a hygrometer Hm2 is installed so that the humidity of the exhaust gas from the through hole H3 can be measured.
  • the through hole H3 for air supply and exhaust is 90 ° to 170 when the upper end portion is 0 ° and the lower end portion is 180 ° in the cross-sectional view of the closed wire rope 10. It is formed in the range of ° (see Fig. 3). This is to reduce the ingress of rainwater.
  • the compressor 8 is operated and the air dried by the dehumidifier 9 is supplied into the closed wire rope 10. That is, ventilation is performed between the through hole H1 for inspection and the through hole H3 for air supply / exhaust.
  • the humidity in the rope is measured at predetermined intervals by the hygrometers Hm1 and Hm2, and when the humidity decrease converges (or when the humidity becomes less than the predetermined value), the air supply drying process is completed.
  • air is supplied by the compressor 8 here as an example, it is more preferable to supply an inert gas.
  • the through hole H1 for inspection and the through hole H3 (and the through hole H2) for air supply and exhaust are closed.
  • the coating may be melted and sealed with a welding material of the same material as in the above-mentioned repair of through scratches, but an opening / closing member capable of opening and closing the through holes ( It is preferable to attach a sealable opening / closing member) because it enables quicker work during re-inspection or repair.
  • FIG. 8A shows an example of an opening / closing member capable of opening / closing a through hole.
  • a rubber plate 16 is provided to cover the entire circumference of the sealed wire rope 10 at a portion where the through hole H1 is formed, a band 17 is attached, and the rubber plate 18 is fastened with a bolt 18.
  • the rubber plate 16 is brought into close contact with the rubber plate 16 around the through hole H1 to seal the through hole H1.
  • the through hole H1 may be filled with butyl rubber putty or the like and then sealed.
  • FIG. 8A shows a rubber plate 16 to cover the entire circumference of the sealed wire rope 10 at a portion where the through hole H1 is formed, a band 17 is attached, and the rubber plate 18 is fastened with a bolt 18.
  • the rubber plate 16 is brought into close contact with the rubber plate 16 around the through hole H1 to seal the through hole H1.
  • the through hole H1 may be filled with butyl rubber putty or the like and then sealed.
  • the rubber plate 16 and the band 17 have the same configuration as the example shown in FIG. 8A, and the band 17 is provided with an on-off valve 19. ..
  • the through hole can be opened and closed more easily.
  • the through hole H1 is filled with a filler such as butyl rubber putty, and the heat-shrinkable tube 20 covers the portion where the through hole H1 is formed with the closed wire rope 10 all around. Is an example of providing.
  • the through hole H1 filled with the filler is sealed by the heat shrinkage of the heat shrink tube 20.
  • the closed wire rope can be repaired efficiently and effectively.
  • air is supplied from the through hole H1 for inspection and exhausted from the through hole H3 for air supply / exhaust, but the through hole H1 for inspection and the air supply / exhaust Anything may be used as long as ventilation is performed between the through holes H3 of the above, and it may be arbitrary from which side air is supplied or air is taken in.
  • the inside of the closed wire rope is ventilated in the direction from top to bottom, the effect of concentrating the moisture in the closed wire rope 10 on the lower side of the rope is obtained, and the water is drained from the through hole H1 for inspection. It is more suitable because it can be done.
  • a through hole for inspection or the like is formed in the closed wire rope after the fact, but when constructing a bridge, a through hole for inspection or a through hole for air supply / exhaust is provided.
  • An opening / closing member as illustrated above (in addition, any member capable of opening / closing the through hole) is provided for the through hole for inspection and the through hole for air supply / exhaust that are formed in advance.
  • the wire rope is provided with an opening / closing member in which a through hole for inspection and a through hole for air supply / exhaust are formed in advance in the coating, and the through hole for inspection and the through hole for air supply / exhaust can be opened and closed. It is a closed wire rope.
  • the application of the present invention is not limited to this, and the present invention can be applied to a closed wire rope used for various bridges such as a suspension bridge.

Abstract

A method for inspecting a coated sealed wire rope 10 used in a bridge, wherein the inspection method has a step for forming an inspection through-hole H1 in the coating of the sealed wire rope 10, a step for increasing or reducing pressure on the inner side of the coating of the sealed wire rope 10 through the inspection through-hole H1, and a step for assessing whether there is penetration damage in the coating of the sealed wire rope 10 according to whether the state of increased or reduced pressure is maintained, the inspection method making it possible to increase the efficiency of operation and to reduce the need for traffic limitation on the bridge for the purpose of an inspection.

Description

密閉式ワイヤロープの点検方法、密閉式ワイヤロープの補修方法、及び、密閉式ワイヤロープInspection method of closed wire rope, repair method of closed wire rope, and closed wire rope
　本発明は、橋梁に使用されている被覆付きの密閉式ワイヤロープの点検方法及び補修方法、橋梁に使用される被覆付きの密閉式ワイヤロープに関する。 The present invention relates to an inspection method and a repair method for a covered sealed wire rope used for a bridge, and a covered sealed wire rope used for a bridge.
　社会インフラの長寿命化のための維持管理の重要性が増しており、その一つとして、橋梁に使用されているワイヤロープの点検がある。
　これに関連する技術として、特許文献１において、ケーブル防錆用被覆材のリークテスターに関する技術が開示されている。 The importance of maintenance for extending the life of social infrastructure is increasing, and one of them is the inspection of wire ropes used for bridges.
As a technique related to this, Patent Document 1 discloses a technique relating to a leak tester for a coating material for cable rust prevention.
実開平０１－０７１６４２号公報Jikkenhei 01-071642
　橋梁に使用するワイヤロープとして、腐食防止等の観点から、鋼線やワイヤロープに被覆がされて密閉されている密閉式ワイヤロープが用いられている。このような密閉式ワイヤロープは、基本的にはメンテナンスフリーなものであるが、例えば落雷時の熱によって被覆が傷つく（小さい穴が空く）ような場合もあり得、一定の期間の経過後などにおいて、被膜の状態（密閉状態）や、内部の鋼線やワイヤロープの状態（水分の浸入の有無等）を点検したいという要請がある。特に外観検査では発見が困難な小さな穴（貫通傷）の有無をなるべく簡易に検知することができる技術が求められている。
　特許文献１に記載の技術は、予めリークが予見される箇所がわかっていることを前提とする技術である。即ち、ケーブルバンド３が設けられる箇所において、該当部分を気密的に被覆するシートを用いて密閉空間部を形成し、当該密閉空間部内を加圧してリークの有無を検出するものである。従って、被覆の貫通傷がどこにあるかわからない密閉式ワイヤロープの点検に特許文献１の技術を用いることを考えた場合、ワイヤロープの全ての箇所に対して順番に“気密的に被覆するシートを用いて密閉空間部を形成し、当該密閉空間部内を加圧してリークの有無を検出する”という作業を繰り返す必要があり、非常に煩雑で非効率な作業を要することとなる。
　また、例えば斜張橋で主塔と橋桁の間に張られたワイヤロープの全長に亘って上記のような作業を行う場合、当該橋の交通を規制する必要があり、経済活動や生活への影響が生じるとともに、これらの影響を最小限にするため、点検作業を行うことができる時間にも制限が生じるものである。 As a wire rope used for a bridge, a sealed wire rope that is sealed by covering a steel wire or a wire rope is used from the viewpoint of corrosion prevention and the like. Such a sealed wire rope is basically maintenance-free, but for example, the coating may be damaged (small holes are made) due to the heat of a lightning strike, and after a certain period of time, etc. There is a request to check the state of the coating film (sealed state) and the state of the steel wire and wire rope inside (presence or absence of moisture intrusion, etc.). In particular, there is a need for a technique that can detect the presence or absence of small holes (penetration scratches) that are difficult to find by visual inspection as easily as possible.
The technique described in Patent Document 1 is a technique on the premise that a location where a leak is foreseen is known in advance. That is, at the place where the cable band 3 is provided, a closed space portion is formed by using a sheet that airtightly covers the corresponding portion, and the inside of the closed space portion is pressurized to detect the presence or absence of a leak. Therefore, when considering the use of the technique of Patent Document 1 for inspecting a closed wire rope in which it is not known where the penetration scratches of the coating are, "a sheet for airtightly covering all parts of the wire rope is applied in order. It is necessary to repeat the work of forming a closed space portion by using the wire rope and pressurizing the inside of the closed space portion to detect the presence or absence of a leak, which requires a very complicated and inefficient work.
In addition, for example, when performing the above-mentioned work over the entire length of the wire rope stretched between the main tower and the bridge girder on a cable-stayed bridge, it is necessary to regulate the traffic of the bridge, which affects economic activities and daily life. In addition to the effects, there is a limit to the amount of time that inspection work can be performed in order to minimize these effects.
　本発明は、上記の点に鑑み、橋梁に使用されている被覆付きの密閉式ワイヤロープの点検方法であって、作業の効率化が図られ、交通規制の必要性を低減することが可能な密閉式ワイヤロープの点検方法を提供することを目的とする。 In view of the above points, the present invention is a method for inspecting a covered wire rope used for a bridge, which can improve work efficiency and reduce the need for traffic regulation. It is an object of the present invention to provide a method for inspecting a closed wire rope.
（構成１）
　橋梁に使用されている被覆付きの密閉式ワイヤロープの点検方法であって、前記密閉式ワイヤロープの被覆に点検用の貫通穴を形成するステップと、前記点検用の貫通穴から、前記密閉式ワイヤロープの被覆の内側に対する加圧若しくは減圧を行うステップと、前記加圧若しくは減圧の状態が維持されるか否かによって、前記密閉式ワイヤロープの被覆に貫通傷があるか否かを判別するステップと、を有することを特徴とする密閉式ワイヤロープの点検方法。
　構成１の点検方法によれば、密閉式ワイヤロープの被覆に貫通傷があるか否かの点検を、橋の交通を規制せずに行うことが可能である。 (Structure 1)
A method for inspecting a sealed wire rope with a coating used for a bridge, wherein a through hole for inspection is formed in the coating of the sealed wire rope, and the through hole for inspection is used to form the sealing type. Whether or not there is a penetration scratch in the coating of the closed wire rope is determined by the step of pressurizing or depressurizing the inside of the wire rope coating and whether or not the pressurizing or depressurizing state is maintained. A method of inspecting a sealed wire rope, characterized by having steps and.
According to the inspection method of the configuration 1, it is possible to inspect whether or not there is a penetration scratch in the coating of the sealed wire rope without restricting the traffic of the bridge.
（構成２）
　橋梁に使用されている被覆付きの密閉式ワイヤロープの点検方法であって、前記密閉式ワイヤロープの被覆に点検用の貫通穴を形成するステップと、前記点検用の貫通穴から、前記密閉式ワイヤロープの被覆の内側に対して加圧若しくは減圧を行うステップと、漏洩音の有無によって、前記密閉式ワイヤロープの被覆に貫通傷があるか否かを判別するステップと、を有することを特徴とする密閉式ワイヤロープの点検方法。 (Structure 2)
A method for inspecting a sealed wire rope with a coating used for a bridge, wherein a through hole for inspection is formed in the coating of the sealed wire rope, and the through hole for inspection is used to form the sealing type. It is characterized by having a step of pressurizing or depressurizing the inside of the wire rope coating, and a step of determining whether or not there is a penetrating scratch on the sealing wire rope coating depending on the presence or absence of leakage noise. How to inspect the sealed wire rope.
（構成３）
　前記加圧若しくは減圧による大気圧との差圧が８×１０３Ｐａ以上となるようにすることを特徴とする構成２に記載の密閉式ワイヤロープの点検方法。 (Structure 3)
The method for inspecting a closed wire rope according to the configuration 2, wherein the pressure difference from the atmospheric pressure due to the pressurization or the depressurization is 8 × 10 3 Pa or more.
（構成４）
　橋梁に使用されている被覆付きの密閉式ワイヤロープの点検方法であって、前記密閉式ワイヤロープの被覆に点検用の貫通穴を形成するステップと、前記点検用の貫通穴から、撮像装置によって撮像可能な検知用ガスを注入するステップと、前記撮像装置によって、前記密閉式ワイヤロープの被覆の外部への前記検知用ガスの漏出が撮像されたか否かによって、前記密閉式ワイヤロープの被覆に貫通傷があるか否かを判別するステップと、を有することを特徴とする密閉式ワイヤロープの点検方法。 (Structure 4)
A method of inspecting a covered sealed wire rope used for a bridge, in which a step of forming a through hole for inspection in the coating of the sealed wire rope and a through hole for inspection are performed by an imaging device. Depending on the step of injecting the detection gas that can be imaged and whether or not the leakage of the detection gas to the outside of the coating of the closed wire rope is imaged by the imaging device, the coating of the closed wire rope is covered. A method of inspecting a closed wire rope, characterized in that it has a step of determining whether or not there is a penetrating scratch.
（構成５）
　前記点検用の貫通穴を、前記橋梁に設置された前記密閉式ワイヤロープの低部側に形成することを特徴とする構成１から４の何れかに記載の密閉式ワイヤロープの点検方法。 (Structure 5)
The method for inspecting a closed wire rope according to any one of configurations 1 to 4, wherein the through hole for inspection is formed on the lower side of the closed wire rope installed on the bridge.
（構成６）
　前記点検用の貫通穴を、前記橋梁に設置された前記密閉式ワイヤロープの低部側に形成し、当該点検用の貫通穴から、吸気を行うことによって、前記密閉式ワイヤロープの被覆の内側に対する減圧を行うことを特徴とする構成１から３の何れかに記載の密閉式ワイヤロープの点検方法。 (Structure 6)
A through hole for inspection is formed on the lower side of the closed wire rope installed on the bridge, and intake is performed from the through hole for inspection to inside the coating of the closed wire rope. The method for inspecting a closed wire rope according to any one of configurations 1 to 3, wherein the pressure is reduced.
（構成７）
　前記密閉式ワイヤロープの低部側に形成した前記点検用の貫通穴から、前記密閉式ワイヤロープの被覆の内側に溜まった水の水抜きを行うことを特徴とする構成５又は６に記載の密閉式ワイヤロープの点検方法。 (Structure 7)
5. The configuration according to the configuration 5 or 6, wherein the water accumulated inside the coating of the closed wire rope is drained from the through hole for inspection formed on the lower side of the closed wire rope. How to inspect a closed wire rope.
（構成８）
　前記密閉式ワイヤロープの低部側に形成した前記点検用の貫通穴から、水より比重の重い流体を注入することによって、前記点検用の貫通穴より低い位置に溜まっている水の水位を上昇させて前記水抜きを行うことを特徴とする構成７に記載の密閉式ワイヤロープの点検方法。 (Structure 8)
By injecting a fluid having a specific gravity heavier than water from the inspection through hole formed on the lower side of the closed wire rope, the water level of water accumulated at a position lower than the inspection through hole is raised. The method for inspecting a closed wire rope according to the configuration 7, wherein the water is drained.
（構成９）
　前記点検用の貫通穴を、前記密閉式ワイヤロープの断面視において、その上端部を０°、下端部を１８０°とした場合に、９０°から１７０°の範囲となる箇所に形成することを特徴とする構成１から８の何れかに記載の密閉式ワイヤロープの点検方法。 (Structure 9)
The through hole for inspection is formed at a position in the range of 90 ° to 170 ° when the upper end portion is 0 ° and the lower end portion is 180 ° in the cross-sectional view of the closed wire rope. The method for inspecting a closed wire rope according to any one of the features 1 to 8.
（構成１０）
　前記密閉式ワイヤロープの被覆に貫通傷が見つかった場合に、当該貫通傷の位置を探索するステップを有することを特徴とする構成１から９の何れかに記載の密閉式ワイヤロープの点検方法。 (Structure 10)
The method for inspecting a closed wire rope according to any one of configurations 1 to 9, wherein when a penetrating scratch is found in the coating of the closed wire rope, the step of searching for the position of the penetrating scratch is provided.
（構成１１）
　前記漏洩音の発生位置を探索することにより、前記貫通傷の位置を探索することを特徴とする構成２に記載の密閉式ワイヤロープの点検方法。 (Structure 11)
The method for inspecting a closed wire rope according to the configuration 2, wherein the position of the penetrating scratch is searched by searching for the position where the leaked sound is generated.
（構成１２）
　前記検知用ガスの漏出位置を探索することにより、前記貫通傷の位置を探索することを特徴とする構成４に記載の密閉式ワイヤロープの点検方法。 (Structure 12)
The method for inspecting a closed wire rope according to the configuration 4, wherein the position of the penetrating scratch is searched by searching for the leak position of the detection gas.
（構成１３）
　構成１０から１２の何れかに記載の密閉式ワイヤロープの点検方法の後に行う密閉式ワイヤロープの補修方法であって、前記貫通傷を補修するステップと、前記点検用の貫通穴とは別に、前記密閉式ワイヤロープの被覆に給排気用の貫通穴を形成するステップと、前記点検用の貫通穴と前記給排気用の貫通穴の間において、通風を行うステップと、前記点検用の貫通穴及び前記給排気用の貫通穴を塞ぐステップと、を有することを特徴とする密閉式ワイヤロープの補修方法。 (Structure 13)
A method for repairing a closed wire rope performed after the method for inspecting a closed wire rope according to any one of configurations 10 to 12, wherein the step for repairing the penetrating scratch and the through hole for the inspection are separated. A step of forming a through hole for air supply / exhaust in the coating of the sealed wire rope, a step of ventilating between the through hole for inspection and the through hole for air supply / exhaust, and the through hole for inspection. A method for repairing a closed wire rope, which comprises a step of closing a through hole for air supply and exhaust, and a step of closing the through hole.
（構成１４）
　前記通風を、不活性ガスによって行うことを特徴とする構成１３に記載の密閉式ワイヤロープの補修方法。 (Structure 14)
The method for repairing a closed wire rope according to the configuration 13, wherein the ventilation is performed by an inert gas.
（構成１５）
　前記点検用の貫通穴及び前記給排気用の貫通穴を塞ぐステップを、前記点検用の貫通穴及び前記給排気用の貫通穴に、貫通穴を開閉可能な開閉部材を取り付けることにより行うことを特徴とする構成１３又は１４に記載の密閉式ワイヤロープの補修方法。 (Structure 15)
The step of closing the through hole for inspection and the through hole for air supply / exhaust is performed by attaching an opening / closing member capable of opening / closing the through hole to the through hole for inspection and the through hole for air supply / exhaust. The method for repairing a closed wire rope according to the feature 13 or 14.
（構成１６）
　前記給排気用の貫通穴を、前記橋梁に設置された前記密閉式ワイヤロープの高部側に形成することを特徴とする構成１３から１５の何れかに記載の密閉式ワイヤロープの補修方法。 (Structure 16)
The method for repairing a closed wire rope according to any one of configurations 13 to 15, wherein the through hole for air supply / exhaust is formed on the high portion side of the closed wire rope installed on the bridge.
（構成１７）
　前記給排気用の貫通穴を、前記密閉式ワイヤロープの断面視において、その上端部を０°、下端部を１８０°とした場合に、９０°から１７０°の範囲となる箇所に形成することを特徴とする構成１３から１６の何れかに記載の密閉式ワイヤロープの補修方法。 (Structure 17)
The through hole for air supply / exhaust shall be formed at a position in the range of 90 ° to 170 ° when the upper end portion is 0 ° and the lower end portion is 180 ° in the cross-sectional view of the sealed wire rope. The method for repairing a closed wire rope according to any one of configurations 13 to 16, wherein
（構成１８）
　構成１から１２の何れかに記載の密閉式ワイヤロープの点検方法が使用される密閉式ワイヤロープであって、当該密閉式ワイヤロープの被覆に、前記点検用の貫通穴が予め形成されており、当該点検用の貫通穴を開閉可能な開閉部材を備えることを特徴とする密閉式ワイヤロープ。 (Structure 18)
A closed wire rope using the method for inspecting a closed wire rope according to any one of configurations 1 to 12, wherein a through hole for inspection is previously formed in the coating of the closed wire rope. , A sealed wire rope characterized by being provided with an opening / closing member capable of opening / closing the through hole for inspection.
（構成１９）
　構成１３から１７の何れかに記載の密閉式ワイヤロープの補修方法が使用される密閉式ワイヤロープであって、当該密閉式ワイヤロープの被覆に、前記給排気用の貫通穴が予め形成されており、当該給排気用の貫通穴を開閉可能な開閉部材を備えることを特徴とする密閉式ワイヤロープ。 (Structure 19)
A closed wire rope using the method for repairing a closed wire rope according to any one of configurations 13 to 17, wherein through holes for air supply and exhaust are formed in advance in the coating of the closed wire rope. A closed wire rope provided with an opening / closing member capable of opening / closing the through hole for air supply / exhaust.
　本発明によれば、橋梁に使用されている被覆付きの密閉式ワイヤロープの点検方法の作業の効率化が図られ、また、点検作業時の交通規制の必要性を低減することが可能となる。 According to the present invention, it is possible to improve the efficiency of the work of the inspection method of the covered sealed wire rope used for the bridge, and to reduce the necessity of traffic regulation at the time of the inspection work. ..
本発明に係る実施形態の密閉式ワイヤロープの点検方法を行う対象である橋梁を示す概略図Schematic diagram showing a bridge to be inspected by the closed wire rope according to the embodiment of the present invention. 実施形態の密閉式ワイヤロープの点検方法を実施する状態を示す概略図Schematic diagram showing a state in which the inspection method of the closed wire rope of the embodiment is carried out. 密閉式ワイヤロープの断面図Sectional view of closed wire rope 密閉式ワイヤロープの点検方法を行う状態の別の例を示す概略図Schematic showing another example of how to inspect a closed wire rope 密閉式ワイヤロープ内に溜まった水を抜く水抜きに関する説明図Explanatory drawing for draining water collected in a closed wire rope 密閉式ワイヤロープ内に溜まった水を抜く水抜きに関する説明図Explanatory drawing for draining water collected in a closed wire rope 実施形態の密閉式ワイヤロープの補修方法における送気乾燥を行う状態を示す概略図Schematic diagram showing a state of performing air supply drying in the method of repairing a closed wire rope according to the embodiment. 点検用の貫通穴若しくは給排気用の貫通穴を開閉可能な開閉部材に関する説明図Explanatory drawing about opening and closing member which can open and close through hole for inspection or through hole for air supply and exhaust 点検用の貫通穴若しくは給排気用の貫通穴を開閉可能な開閉部材に関する説明図Explanatory drawing about opening and closing member which can open and close through hole for inspection or through hole for air supply and exhaust
　以下、本発明の実施形態について、図面を参照しながら具体的に説明する。なお、以下の実施形態は、本発明を具体化する際の一形態であって、本発明をその範囲内に限定するものではない。 Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings. The following embodiment is an embodiment of the present invention, and does not limit the present invention to the scope thereof.
＜実施形態１＞
　図１は、本実施形態の密閉式ワイヤロープの点検方法を行う対象である橋梁（斜張橋）の一例を示す概略図であり、図１（ａ）は斜張橋１００の構成の概略を示す図、図１（ｂ）は密閉式ワイヤロープ１０の１本のみを示した概略図である。
　斜張橋１００は、主塔１０１と主桁１０２の間に複数の斜材（密閉式ワイヤロープ１０）が張られている。
　密閉式ワイヤロープ１０は、鋼線やワイヤロープに高密度ポリエチレン等の被覆がされ、両端部においてソケット加工（ソケット１１、１２）されることにより、内部にワイヤロープが密閉された構造となっている。
　図３には密閉式ワイヤロープ１０の一例の断面図を示した。ここの例として示される密閉式ワイヤロープ１０は、亜鉛メッキ鋼線１３を平行に集束しながら、強度と弾性係数を低下させない程度のピッチで撚りを加え、これをフィラメントテープ１５で巻いた上に高密度ポリエチレンの被覆１４を行ったものである。なお、ここでは被覆平行線ストランドを例としているため、フィラメントテープ１５を有するものであるが、例えばワイヤロープや単線の鋼線に被覆をしているような場合には、フィラメントテープ１５は不要である。 <Embodiment 1>
FIG. 1 is a schematic view showing an example of a bridge (cable-stayed bridge) to which the inspection method of the closed wire rope of the present embodiment is performed, and FIG. 1 (a) shows an outline of the configuration of the cable-stayed bridge 100. The figure shown, FIG. 1B is a schematic view showing only one of the sealed wire ropes 10.
In the cable-stayed bridge 100, a plurality of cable-stayed members (sealed wire rope 10) are stretched between the main tower 101 and the main girder 102.
The sealed wire rope 10 has a structure in which the wire rope is sealed inside by coating the steel wire or the wire rope with high-density polyethylene or the like and processing sockets (sockets 11 and 12) at both ends. There is.
FIG. 3 shows a cross-sectional view of an example of the closed wire rope 10. In the sealed wire rope 10 shown as an example here, the galvanized steel wire 13 is focused in parallel, twisted at a pitch that does not reduce the strength and elastic modulus, and wound with the filament tape 15 on the twisted wire rope 10. It is coated with high-density polyethylene 14. Since the coated parallel wire strand is used as an example here, the filament tape 15 is provided. However, for example, when the wire rope or the single wire steel wire is coated, the filament tape 15 is unnecessary. is there.
　本実施形態の密閉式ワイヤロープの点検方法は、密閉式ワイヤロープ１０の被覆に貫通傷があるか否かの点検を、主桁１０２内において行うものである。
　先ず、密閉式ワイヤロープ１０の被覆に点検用の貫通穴Ｈ１を形成する。点検用の貫通穴Ｈ１は、主桁１０２内の密閉式ワイヤロープ１０の被覆に対して開けられる。即ち、斜張橋１００に設置されている密閉式ワイヤロープ１０の低部側（もっとも低くなる場所付近）に形成される。
　また、点検用の貫通穴Ｈ１は、密閉式ワイヤロープ１０の断面視において、その上端部を０°、下端部を１８０°とした場合に、９０°から１７０°の範囲となる箇所に形成する（図３参照）。密閉式ワイヤロープ１０の上面側は、雨等が浸入しやすく、また、密閉式ワイヤロープ１０の底面側は表面張力によって密閉式ワイヤロープ１０の表面を伝う雨水が、重力によって底面側に集まるため、こちらも雨水が浸入しやすくなる。本実施形態においては主桁１０２内において点検用の貫通穴Ｈ１を形成するため、雨水の浸入の問題はあまり大きくないが、橋梁の構造の都合等により、露天の箇所に点検用の貫通穴Ｈ１を形成する場合には、図３に示されるように、点検用の貫通穴Ｈ１の形成位置を９０°から１７０°の範囲とすることにより、点検用の貫通穴Ｈ１からの雨水の浸入を低減できるものである。 In the inspection method of the closed wire rope of the present embodiment, the main girder 102 is inspected for whether or not there is a penetration scratch in the coating of the closed wire rope 10.
First, a through hole H1 for inspection is formed in the coating of the sealed wire rope 10. The through hole H1 for inspection is opened with respect to the coating of the closed wire rope 10 in the main girder 102. That is, it is formed on the lower side (near the lowest place) of the closed wire rope 10 installed on the cable-stayed bridge 100.
Further, the through hole H1 for inspection is formed at a position in the range of 90 ° to 170 ° when the upper end portion is 0 ° and the lower end portion is 180 ° in the cross-sectional view of the closed wire rope 10. (See FIG. 3). Rain and the like easily enter the upper surface side of the closed wire rope 10, and rainwater traveling on the surface of the closed wire rope 10 collects on the bottom side due to surface tension on the bottom surface side of the closed wire rope 10. , This also makes it easier for rainwater to enter. In the present embodiment, since the through hole H1 for inspection is formed in the main girder 102, the problem of rainwater intrusion is not so large, but due to the structure of the bridge or the like, the through hole H1 for inspection is formed in the open-air location. As shown in FIG. 3, the formation position of the through hole H1 for inspection is set in the range of 90 ° to 170 ° to reduce the intrusion of rainwater from the through hole H1 for inspection. It can be done.
　次に、点検用の貫通穴Ｈ１から吸気を行うための真空ポンプを接続する。図２は、点検用の機材を設置した状態を示す概略図である。
　点検用の貫通穴Ｈ１に対して気密的に送吸気路（パイプ等）１を接続し、送吸気路１に真空ポンプ２を接続するとともに、送吸気路１上に圧力計３を設置する。なお、本実施形態では、点検用の貫通穴Ｈ１の他に、貫通穴Ｈ２を密閉式ワイヤロープ１０の被覆に形成し、当該貫通穴Ｈ２に密閉式ワイヤロープ１０の被覆内の圧力を直接的に測定する圧力計４を設置するようにしているが、貫通穴Ｈ２と圧力計４は必須のものではない。 Next, a vacuum pump for sucking air is connected from the through hole H1 for inspection. FIG. 2 is a schematic view showing a state in which inspection equipment is installed.
The air supply / intake passage (pipe or the like) 1 is airtightly connected to the through hole H1 for inspection, the vacuum pump 2 is connected to the air supply / intake passage 1, and the pressure gauge 3 is installed on the air supply / intake passage 1. In the present embodiment, in addition to the through hole H1 for inspection, the through hole H2 is formed in the coating of the closed wire rope 10, and the pressure in the coating of the closed wire rope 10 is directly applied to the through hole H2. Although the pressure gauge 4 for measuring is installed in, the through hole H2 and the pressure gauge 4 are not indispensable.
　図２のように点検用の機材の設置ができたら、真空ポンプ２を駆動して、密閉式ワイヤロープ１０の被覆の内側を減圧する。
　圧力計３（若しくは圧力計４）を確認し、大気圧より１．５×１０４Ｐａ以上低い圧力まで減圧されたら、送吸気路１上（圧力計３と真空ポンプ２の間）に設置したエアバルブを閉めることで、真空ポンプ２側からの漏洩を防止した状態で、真空ポンプ２を停止する。
　この状態で、減圧状態が所定値内で一定時間（例えば１０分間以上）維持されるか否かを圧力計３（若しくは圧力計４）で確認する。
　減圧状態が一定時間維持されるようであれば、密閉式ワイヤロープ１０の被覆に貫通傷は無いと判断され、減圧状態が維持されない場合は、密閉式ワイヤロープ１０の被覆に貫通傷があると判断される。 After the inspection equipment is installed as shown in FIG. 2, the vacuum pump 2 is driven to reduce the pressure inside the coating of the closed wire rope 10.
Check the pressure gauge 3 (or pressure gauge 4), and when the pressure is reduced to 1.5 x 10 4 Pa or more lower than the atmospheric pressure, install it on the air supply / intake passage 1 (between the pressure gauge 3 and the vacuum pump 2). By closing the air valve, the vacuum pump 2 is stopped while preventing leakage from the vacuum pump 2 side.
In this state, it is confirmed by the pressure gauge 3 (or the pressure gauge 4) whether or not the decompression state is maintained within a predetermined value for a certain period of time (for example, 10 minutes or more).
If the depressurized state is maintained for a certain period of time, it is determined that there is no penetrating scratch on the coating of the sealed wire rope 10, and if the decompressed state is not maintained, the coating of the sealed wire rope 10 is judged to have a penetrating scratch. Judged.
　点検用の貫通穴Ｈ１を利用した点検事項として、貫通傷の有無の点検の他に、点検用の貫通穴Ｈ１から見える内部のワイヤロープの目視による状態チェックや、内部に水が溜まっているか否かのチェック、及び水が溜まっていた場合の水抜き作業がある。
　密閉式ワイヤロープ１０の被覆に貫通傷があること等によって、内部に水が浸入した場合、図５に示されるように、この水Ｗは密閉式ワイヤロープ１０の低部側に溜まる。
　この水Ｗが溜まる箇所である密閉式ワイヤロープ１０の低部側に点検用の貫通穴Ｈ１を形成することにより、水抜き作業が容易に行える。
　点検用の貫通穴Ｈ１を、密閉式ワイヤロープ１０の最も低い位置に形成できれば、上記の観点においては好ましいが、実際にはロープ端部に形成されているソケットの存在や、当該ソケットの主桁側の構造物との係合状況などにより、最も低い位置に形成することは難しい。
　例えば、図５に例示される位置に点検用の貫通穴Ｈ１を空けた場合、水位がＷＬとなるまでは点検用の貫通穴Ｈ１から自動的に水が抜けるが、水位ＷＬ以下の水については別途水抜き作業が必要になる。 As inspection items using the through hole H1 for inspection, in addition to checking for penetration scratches, visually checking the condition of the wire rope inside that can be seen from the through hole H1 for inspection, and whether water is accumulated inside. There is a check for this and drainage work when water has accumulated.
When water invades the inside due to a penetrating scratch on the coating of the closed wire rope 10, the water W collects on the lower side of the closed wire rope 10 as shown in FIG.
By forming the through hole H1 for inspection on the lower side of the closed wire rope 10 where the water W collects, the drainage work can be easily performed.
It is preferable from the above viewpoint that the through hole H1 for inspection can be formed at the lowest position of the closed wire rope 10, but in reality, the existence of the socket formed at the end of the rope and the main girder of the socket are present. It is difficult to form it at the lowest position depending on the engagement with the structure on the side.
For example, when a through hole H1 for inspection is made at a position illustrated in FIG. 5, water is automatically drained from the through hole H1 for inspection until the water level reaches WL, but water below the water level WL is automatically discharged. Separate drainage work is required.
　当該水抜き作業は、鋼線１３と被覆１４（フィラメントテープ１５）の間の隙間（図３参照）に、密閉式ワイヤロープ１０の可能な限り低い位置に至るまで、点検用の貫通穴Ｈ１からチューブＴｂを挿入して、シリンジＳｙを使って水Ｗを吸引除去することによって行うことができる（図６（ａ））。
　また、別の方法として、点検用の貫通穴Ｈ１から、水Ｗより比重の重い流体を注入することによって、水Ｗの水位ＷＬを上昇させて、点検用の貫通穴Ｈ１から水Ｗを排出させる方法がある。“水Ｗより比重の重い流体”である置換液体としては、ふっ素系不活性液体等の、鋼線１３を腐食させない不活性なものを使用する。置換液体の注入は、図６（ａ）と同様に、チューブＴｂやシリンジＳｙ等を使用して行う。
　なお、点検用の貫通穴Ｈ１を形成した際に、水が出てくれば、内部に水が溜まっていることが明らかであるが、点検用の貫通穴Ｈ１から水が出てこない場合においては、点検用の貫通穴Ｈ１よりも低い位置に水が溜まっていないかを確認（滞水確認）する必要がある。また、上記した水抜き作業によって滞水が除去されたか否かを確認する必要がある。
　当該滞水確認は、鋼線１３と被覆１４（フィラメントテープ１５）の間の隙間に、密閉式ワイヤロープ１０の可能な限り低い位置に至るまで、水分検知剤を塗布した細径ワイヤーＷｒを挿入し（図６（ｂ））、これを抜き取って水分検知剤の変色の有無を確認することで行う。
　滞水が確認された場合には、上記した水抜き作業を行う。 The drainage work is performed from the through hole H1 for inspection to the lowest possible position of the sealed wire rope 10 in the gap (see FIG. 3) between the steel wire 13 and the coating 14 (filament tape 15). This can be done by inserting the tube Tb and sucking and removing the water W using a syringe Sy (FIG. 6 (a)).
As another method, the water level WL of the water W is raised by injecting a fluid having a specific gravity heavier than that of the water W from the through hole H1 for inspection, and the water W is discharged from the through hole H1 for inspection. There is a way. As the substitution liquid, which is a “fluid having a specific gravity heavier than that of water W”, an inert liquid such as a fluorine-based inert liquid that does not corrode the steel wire 13 is used. The replacement liquid is injected using a tube Tb, a syringe Sy, or the like, as in FIG. 6A.
If water comes out when the through hole H1 for inspection is formed, it is clear that water is accumulated inside, but if water does not come out from the through hole H1 for inspection, it is clear. , It is necessary to confirm whether water is accumulated at a position lower than the through hole H1 for inspection (confirmation of water retention). In addition, it is necessary to confirm whether or not the stagnant water has been removed by the above-mentioned draining operation.
To confirm the water retention, insert a small-diameter wire Wr coated with a moisture detection agent into the gap between the steel wire 13 and the coating 14 (filament tape 15) to the lowest possible position of the sealed wire rope 10. (Fig. 6 (b)), this is removed and the presence or absence of discoloration of the moisture detector is confirmed.
If water retention is confirmed, perform the above-mentioned draining work.
　密閉式ワイヤロープ１０の内部に溜まっていた水を採取し、これの水分調査をするようにしてもよい。
　採取した滞水の特定成分量を調査することで、鋼線１３の腐食状況や腐食環境の程度を推定するものである。鉄や亜鉛の含有量により素線や防錆皮膜（めっき）の状態を、pH値や塩化物イオンの含有量により腐食環境を評価する。滞水とともに現地の環境水（雨水、大気中水分の２種類）の分析を行うことで、水の浸入状態や浸入箇所の推定に利用することができる。 The water accumulated inside the closed wire rope 10 may be collected and the water content of the closed wire rope 10 may be investigated.
By investigating the amount of specific components of the collected stagnant water, the corrosive state of the steel wire 13 and the degree of the corroded environment are estimated. The state of the wire and rust preventive film (plating) is evaluated by the content of iron and zinc, and the corrosive environment is evaluated by the pH value and the content of chloride ions. By analyzing the local environmental water (rainwater and atmospheric moisture) together with the stagnant water, it can be used to estimate the infiltration state and intrusion location of water.
　以上のごとく、本実施形態の密閉式ワイヤロープの点検方法によれば、橋梁に使用されている被覆付きの密閉式ワイヤロープの貫通傷の有無の点検作業の効率化が図られる。また、上記説明のごとく、主桁１０２内等の、橋の交通に影響のない場所において作業を行うことができるため、当該作業を行うために橋の交通を規制する必要がなく、経済活動や生活への影響を低減できると共に、点検作業を行うことができる時間も自由度が高い。
　例えば外観検査等の点検方法の場合、ロープの全長にわたって検査をする必要があるため、当該作業を行うために橋の交通を規制しなければならない。また、外観検査では、外傷等を見つけることはできるが、これが貫通した穴であるか否かを判別することが非常に難しい場合がある。特に小さな貫通傷である場合、外観検査によって外傷として見つけることは可能であっても、これが貫通した穴であるか否かを判別することは非常に難しい。
　これに対し、本実施形態の点検方法によれば、主桁内における作業のみで、非常に小さな貫通傷であっても、これがあるか否かを検査することができ、点検作業が効率的であると共に、橋の交通を規制する必要がなく、非常に好適である。
　また、本実施形態では、密閉式ワイヤロープ１０の低部側に点検用の貫通穴Ｈ１を形成し、ここから吸気をするため、密閉式ワイヤロープ１０内の水分をロープの低部側に集約させる効果が得られ、点検用の貫通穴Ｈ１からの水抜きがより効率的になるため好適である。 As described above, according to the inspection method of the closed wire rope of the present embodiment, it is possible to improve the efficiency of the inspection work for the presence or absence of penetrating scratches on the covered closed wire rope used for the bridge. In addition, as explained above, since the work can be performed in a place that does not affect the traffic of the bridge, such as inside the main girder 102, there is no need to regulate the traffic of the bridge in order to perform the work, and economic activities and economic activities Not only can the impact on people's lives be reduced, but the time available for inspection work is also high.
For example, in the case of an inspection method such as a visual inspection, it is necessary to inspect the entire length of the rope, so that the traffic of the bridge must be regulated in order to carry out the work. In addition, although it is possible to find an injury or the like by a visual inspection, it may be very difficult to determine whether or not this is a through hole. It is very difficult to determine if this is a through hole, even if it can be found as a trauma by visual inspection, especially if it is a small penetrating wound.
On the other hand, according to the inspection method of the present embodiment, it is possible to inspect whether or not there is a very small penetrating scratch only by the work in the main girder, and the inspection work is efficient. At the same time, there is no need to regulate the traffic on the bridge, which is very suitable.
Further, in the present embodiment, a through hole H1 for inspection is formed on the lower side of the closed wire rope 10, and in order to take in air from this through hole H1, the moisture in the closed wire rope 10 is collected on the lower side of the rope. It is preferable because the effect of making the water drain from the through hole H1 for inspection becomes more efficient.
　なお、本実施形態では、密閉式ワイヤロープ１０の被覆の内側を減圧するものを例として説明したが、加圧するものであってもよい。
　密閉式ワイヤロープ１０の被覆の内側を加圧する場合の機材の設置例を図４に示した。図４の例では、真空ポンプ２の替わりに、送吸気路１にガスボンベ５（例えばＣＯ２ボンベ）を接続している。その他は基本的に図２の構成と同様である（エアバルブ７や減圧弁６を記載しているが、概念として相違するものではない）。
　図４のように点検用の機材の設置ができたら、ガスボンベ５のバルブ（及びエアバルブ７）を開き、密閉式ワイヤロープ１０の被覆の内側を加圧する。
　圧力計３（若しくは圧力計４）を確認し、大気圧より１．５×１０４Ｐａ以上高い圧力まで加圧し（減圧弁６によって調整）、エアバルブ７を閉める。
　この状態で、加圧状態が所定値内で一定時間（例えば１０分間以上）維持されるか否かを圧力計３（若しくは圧力計４）で確認する。
　加圧状態が一定時間維持されるようであれば、密閉式ワイヤロープ１０の被覆に貫通傷は無いと判断され、加圧状態が維持されない場合は、密閉式ワイヤロープ１０の被覆に貫通傷があると判断される。
　なお、密閉式ワイヤロープ１０内に送気する気体としてＣＯ２を例としているが、これに限るものではない。ワイヤロープの素線と被覆に影響がなく、かつ桁内や主塔内に排気されることを想定して引火性や中毒性が低いものであれば、任意の気体を用いることができる。コンプレッサ等を用いて空気を送気するものであってもよい。 In the present embodiment, the pressure inside the coating of the closed wire rope 10 has been reduced as an example, but the pressure may be applied.
FIG. 4 shows an installation example of the equipment when the inside of the coating of the closed wire rope 10 is pressurized. In the example of FIG. 4, a gas cylinder 5 (for example, a CO 2 cylinder) is connected to the air supply / intake passage 1 instead of the vacuum pump 2. Others are basically the same as the configuration of FIG. 2 (the air valve 7 and the pressure reducing valve 6 are described, but they are not different in concept).
After the inspection equipment is installed as shown in FIG. 4, the valve (and air valve 7) of the gas cylinder 5 is opened to pressurize the inside of the coating of the sealed wire rope 10.
Check the pressure gauge 3 (or pressure gauge 4), pressurize to a pressure 1.5 × 10 4 Pa or more higher than the atmospheric pressure (adjusted by the pressure reducing valve 6), and close the air valve 7.
In this state, it is confirmed by the pressure gauge 3 (or the pressure gauge 4) whether or not the pressurized state is maintained within a predetermined value for a certain period of time (for example, 10 minutes or more).
If the pressurized state is maintained for a certain period of time, it is determined that there are no penetrating scratches on the coating of the sealed wire rope 10, and if the pressurized state is not maintained, there are penetrating scratches on the coating of the sealed wire rope 10. It is judged that there is.
Although CO 2 is taken as an example of the gas to be supplied into the closed wire rope 10, the present invention is not limited to this. Any gas can be used as long as it does not affect the wire and coating of the wire rope and has low flammability and toxicity assuming that it is exhausted into the girder or main tower. Air may be supplied using a compressor or the like.
　また、本実施形態では、加圧若しくは減圧の状態が維持されるか否かによって、前記密閉式ワイヤロープの被覆に貫通傷があるか否かを判別するものと例としたが、加圧若しくは減圧によって、貫通傷から気体が漏洩する漏洩音の有無によって、前記密閉式ワイヤロープの被覆に貫通傷があるか否かを判別するようにしてもよい。また、撮像装置（カメラ等）によって撮像可能な検知用ガスを密閉式ワイヤロープ１０内に送気し、撮像装置によって、密閉式ワイヤロープの被覆の外部への検知用ガスの漏出が撮像されたか否かによって、密閉式ワイヤロープの被覆に貫通傷があるか否かを判別するようにしてもよい。 Further, in the present embodiment, it is determined whether or not there is a penetrating scratch in the coating of the sealed wire rope depending on whether or not the state of pressurization or depressurization is maintained. Whether or not there is a penetrating scratch in the coating of the sealed wire rope may be determined based on the presence or absence of a leaking sound in which gas leaks from the penetrating scratch due to the reduced pressure. Further, whether the detection gas that can be imaged by an imaging device (camera or the like) is sent into the closed wire rope 10 and the leakage of the detecting gas to the outside of the coating of the sealed wire rope is imaged by the imaging device. Depending on whether or not there is a penetration scratch in the coating of the sealed wire rope, it may be determined.
　漏洩音検知法の場合、漏洩音の検知のため、密閉式ワイヤロープに対する加圧若しくは減圧において、漏洩箇所付近における大気圧との差圧が８×１０３Ｐａ以上となるように加圧若しくは減圧をすることが好ましい。実験により、漏洩箇所付近における大気圧との差圧が８×１０３Ｐａである場合には、漏洩音を検知できることが確認できた。当該実験は、被覆１４の厚さが１０ｍｍであり、直径が１３９ｍｍ（被膜を除いたケーブルの直径は１１９ｍｍ）である密閉式ワイヤロープ１０に対して行った。
　漏洩箇所、即ち貫通傷がどこにあるかはわからないため、“漏洩箇所付近における大気圧との差圧が８×１０３Ｐａ以上”とするためには、密閉式ワイヤロープの任意の場所において、“漏洩箇所付近における大気圧との差圧が８×１０３Ｐａ以上”であることが好ましい。
　本実施形態のごとく、密閉式ワイヤロープ１０の低部側から加圧若しくは減圧をする場合、密閉式ワイヤロープ１０の高部側において大気圧との差圧が８×１０３Ｐａ以上となるようにするとよい。即ち、漏洩音を検知可能とするための大気圧との差圧が、加圧又は減圧を行う点検用の貫通穴Ｈ１から最も離れた場所付近で満たされるようにするとよい。このために、図４に示されるように、密閉式ワイヤロープ１０の高部側（もっとも高くなる場所付近）に貫通穴Ｈ３を形成し、当該貫通穴Ｈ３に圧力計４－２を設置し、ここでの測定値における大気圧との差圧が８×１０３Ｐａ以上となるようにする。斜張橋１００の密閉式ワイヤロープ１０の１本に対して、圧力計４－２を設置した上での、“差圧を８×１０３Ｐａ以上とするための条件出し”を一度行えば、斜張橋１００の他の密閉式ワイヤロープ１０の検査を行う際には、高所側の圧力計４－２をいちいち設置しなくても、ほぼ同条件で低部側から加圧若しくは減圧をすれば問題ない。特に、最初に長い密閉式ワイヤロープ１０に基づいて条件出しを行うことで、これより短い密閉式ワイヤロープ１０に対する検査においては、同条件で加圧若しくは減圧をすれば問題ない。
　なお、貫通穴Ｈ３は、実施形態２で説明する給排気用の貫通穴Ｈ３として使用できる。貫通穴Ｈ３は、点検用の貫通穴Ｈ１と同様に、密閉式ワイヤロープ１０の断面視において、その上端部を０°、下端部を１８０°とした場合に、９０°から１７０°の範囲となる箇所に形成する（図３参照）。雨水の浸入を低減するためである。
　漏洩音は密閉式ワイヤロープ１０を伝って伝搬するため、主桁１０２内において検知することができる。即ち、主桁１０２内の密閉式ワイヤロープ１０に振動センサを取付けること等によって、漏洩音の有無を検知することができる。また、指向性マイクを用いて離れた場所（例えば主桁１０２上）から漏洩音の有無を検知することもできる。上述したように、密閉式ワイヤロープ１０は、基本的にはメンテナンスフリーなものであり、大きな貫通傷が生じることは基本的にはない。即ち、基本的には、小さな貫通傷の発見が主な目的であり、このような小さな貫通傷において生じる気体の漏洩音を検知するものである。小さな穴であって、その深さは均一（被膜の厚さ）であり、ロープはその全長にわたって基本的に同一構造であるため、漏洩音を生じさせる条件が比較的均一なものとなる。よって、所定の加圧条件下における漏洩音の検知によって精度よく貫通傷の有無を検知できるものである。
　従って、上記と同様に、主桁内若しくは主桁上等の、交通に影響のない場所における作業のみで、非常に小さな貫通傷であっても、これがあるか否かを検査することができ、点検作業が効率的であると共に、橋の交通を規制する必要がなく、非常に好適である。 In the case of the leak sound detection method, in order to detect the leak sound, when pressurizing or depressurizing the closed wire rope, pressurization or depressurization is performed so that the pressure difference from the atmospheric pressure near the leak point is 8 × 10 3 Pa or more. It is preferable to do. From the experiment, it was confirmed that the leaked sound can be detected when the differential pressure from the atmospheric pressure in the vicinity of the leaked part is 8 × 10 3 Pa. The experiment was performed on a closed wire rope 10 having a coating 14 thickness of 10 mm and a diameter of 139 mm (the diameter of the cable excluding the coating was 119 mm).
Since it is not known where the leaked part, that is, the penetrating scratch is, in order to make the pressure difference from the atmospheric pressure in the vicinity of the leaked part 8 × 10 3 Pa or more, in any place of the sealed wire rope, “ It is preferable that the pressure difference from the atmospheric pressure in the vicinity of the leak point is 8 × 10 3 Pa or more.
When pressurizing or depressurizing from the low side of the closed wire rope 10 as in the present embodiment, the pressure difference from the atmospheric pressure on the high side of the closed wire rope 10 should be 8 × 10 3 Pa or more. It is good to set it to. That is, it is preferable that the differential pressure from the atmospheric pressure for enabling the detection of the leaked sound is filled in the vicinity of the place farthest from the through hole H1 for inspection for pressurizing or depressurizing. For this purpose, as shown in FIG. 4, a through hole H3 is formed on the high side (near the highest point) of the closed wire rope 10, and a pressure gauge 4-2 is installed in the through hole H3. The pressure difference from the atmospheric pressure in the measured value here should be 8 × 10 3 Pa or more. Once a pressure gauge 4-2 is installed on one of the closed wire ropes 10 of the cable-stayed bridge 100, and "conditions for setting the differential pressure to 8 x 10 3 Pa or more" are performed once. When inspecting other closed wire ropes 10 of the cable-stayed bridge 100, pressurization or depressurization from the lower side under almost the same conditions without installing a pressure gauge 4-2 on the high place side one by one. There is no problem if you do. In particular, by first setting the conditions based on the long closed wire rope 10, there is no problem in inspecting the shorter closed wire rope 10 by pressurizing or reducing the pressure under the same conditions.
The through hole H3 can be used as the through hole H3 for air supply / exhaust described in the second embodiment. Similar to the through hole H1 for inspection, the through hole H3 is in the range of 90 ° to 170 ° when the upper end portion is 0 ° and the lower end portion is 180 ° in the cross-sectional view of the closed wire rope 10. (See FIG. 3). This is to reduce the ingress of rainwater.
Since the leaked sound propagates along the closed wire rope 10, it can be detected in the main girder 102. That is, the presence or absence of leakage sound can be detected by attaching a vibration sensor to the closed wire rope 10 in the main girder 102. It is also possible to detect the presence or absence of leaked sound from a remote location (for example, on the main girder 102) using a directional microphone. As described above, the sealed wire rope 10 is basically maintenance-free, and basically does not cause a large penetration scratch. That is, basically, the main purpose is to detect small penetrating scratches, and to detect the leakage sound of gas generated in such small penetrating scratches. Since it is a small hole, its depth is uniform (thickness of the coating film), and the rope has basically the same structure over its entire length, the conditions for causing leakage noise are relatively uniform. Therefore, it is possible to accurately detect the presence or absence of penetrating scratches by detecting the leaked sound under a predetermined pressurizing condition.
Therefore, as in the above, it is possible to inspect whether or not there is a very small penetrating scratch only by working in a place that does not affect traffic, such as inside the main girder or above the main girder. The inspection work is efficient and there is no need to regulate the traffic on the bridge, which is very suitable.
　検知用ガスを用いる方法は、ある波長帯の電磁波を吸収する特性を有するガスや、ある波長帯の電磁波を反射若しくは発する特性を有するガスを使用し、それぞれの波長帯に対する撮像感度を有する撮像装置（カメラ等）を用いて撮像することで、貫通傷から漏れ出るガスを検知する。
　例えば、検知用ガスとして、有色のガスを使用し、通常の光学式カメラ若しくは目視にてガスの漏洩の有無を検知するものや、ＣＯ２ガスを使用し、二酸化炭素検知用赤外線カメラを用いてガスの漏洩の有無を検知するもの、加熱した任意の気体を使用し、赤外線サーモグラフィーによってガスの漏洩の有無を検知するもの等である。
　適宜望遠レンズを使用すること等によって、交通に影響のない場所における作業のみで、非常に小さな貫通傷であっても、これがあるか否かを検査することができ、点検作業が効率的であると共に、橋の交通を規制する必要がなく、非常に好適である。なお、検知用ガスを用いる方法の場合には、貫通傷の有無に加えて、その位置も判別可能である。 The method using the detection gas is an imaging device that uses a gas that has the property of absorbing electromagnetic waves in a certain wavelength band and a gas that has the property of reflecting or emitting electromagnetic waves in a certain wavelength band and has imaging sensitivity for each wavelength band. By taking an image using (camera, etc.), the gas leaking from the penetrating scratch is detected.
For example, as the detection gas, a colored gas is used and a normal optical camera or a gas that visually detects the presence or absence of gas leakage, or a CO 2 gas is used and an infrared camera for carbon dioxide detection is used. Those that detect the presence or absence of gas leakage, those that detect the presence or absence of gas leakage by infrared thermography using an arbitrary heated gas, and the like.
By using a telephoto lens as appropriate, it is possible to inspect whether or not there is a very small penetrating scratch only in a place that does not affect traffic, and the inspection work is efficient. At the same time, there is no need to regulate the traffic on the bridge, which is very suitable. In the case of the method using the detection gas, the position can be determined in addition to the presence or absence of the penetrating scratch.
＜実施形態２＞
　次に、実施形態２として、密閉式ワイヤロープの補修方法について説明する。
　本実施形態の密閉式ワイヤロープの補修方法は、実施形態１の密閉式ワイヤロープの点検方法によって、貫通傷があると判断された場合に実施されるものである。
　本実施形態の密閉式ワイヤロープの補修方法は、大まかには、貫通傷を補修するステップと、点検用の貫通穴Ｈ１とは別に、密閉式ワイヤロープ１０の被覆に給排気用の貫通穴Ｈ３を形成するステップと、点検用の貫通穴Ｈ１と給排気用の貫通穴Ｈ３の間において、通風を行うステップと、点検用の貫通穴Ｈ１及び給排気用の貫通穴Ｈ３を塞ぐステップと、を有する。
　以下、順に説明する。 <Embodiment 2>
Next, as the second embodiment, a method of repairing the closed wire rope will be described.
The method of repairing the closed wire rope of the present embodiment is carried out when it is determined by the inspection method of the closed wire rope of the first embodiment that there is a penetration scratch.
The method of repairing the closed wire rope of the present embodiment is roughly different from the step of repairing the penetrating scratch and the through hole H1 for inspection, and the through hole H3 for air supply / exhaust on the coating of the closed wire rope 10. A step of ventilating between the through hole H1 for inspection and the through hole H3 for air supply / exhaust, and a step of closing the through hole H1 for inspection and the through hole H3 for air supply / exhaust. Have.
Hereinafter, they will be described in order.
　実施形態１の点検方法によって貫通傷があると判断された密閉式ワイヤロープ１０について、貫通傷を補修する（塞ぐ）ために、先ず、貫通傷の場所を特定する。
　貫通傷の場所の特定としては、例えば以下の方法が挙げられる。
１．検知用流体（基本的には気体）を点検用の貫通穴Ｈ１から供給し、貫通傷から漏洩する検知用流体を検知する。
　基本的に実施形態１で触れた“検知用ガスを用いる方法”と同様である。実施形態１の点検方法において“検知用ガスを用いる方法”を使用する等して、既に貫通傷の位置が特定されている場合には、再度の作業は特に必要ないが、貫通傷の場所をより正確に特定するために、例えば、撮像装置を搭載した、ロープに沿って移動する自走機器や、ドローン等を用いて、検知用ガスが漏洩している箇所を特定するようにしてもよい。また、撮像装置に替えて、検知用のガスを検知するガスセンサをロープに沿って移動する自走機器や、ドローン等に搭載して、検知用ガスが漏洩している箇所を特定してもよい。
２．漏洩音や風圧により貫通傷の場所を特定する。
　例えば、任意の流体（基本的には気体）を供給、若しくは吸引することによって生じる漏洩音を、聴音確認若しくはマイクを搭載した装置（ロープに沿って移動する自走機器や、ドローン等）を用いて、検知し、音の大小でその位置を特定する。又は、任意の気体を供給、若しくは吸引することによって生じる風圧を、圧力センサを搭載した装置（ロープに沿って移動する自走機器や、ドローン等）を用いて検知し、貫通傷の場所を特定する。
３．リークチェック液により貫通傷の場所を特定する。
　点検用の貫通穴Ｈ１に対する送気をしつつ、発泡液などのリークチェック液を使用して貫通傷の場所を特定する。 In order to repair (close) the penetrating scratch of the sealed wire rope 10 determined to have the penetrating scratch by the inspection method of the first embodiment, the location of the penetrating scratch is first specified.
Examples of the location of the penetrating wound include the following methods.
1. 1. A detection fluid (basically a gas) is supplied from the through hole H1 for inspection, and the detection fluid leaking from the through scratch is detected.
It is basically the same as the "method using detection gas" mentioned in the first embodiment. If the position of the penetrating scratch has already been specified by using the "method using a detection gas" in the inspection method of the first embodiment, re-operation is not particularly necessary, but the location of the penetrating scratch is determined. In order to identify more accurately, for example, a self-propelled device equipped with an imaging device that moves along a rope, a drone, or the like may be used to identify the location where the detection gas is leaking. .. Further, instead of the imaging device, a gas sensor that detects the detection gas may be mounted on a self-propelled device that moves along a rope, a drone, or the like to identify a location where the detection gas is leaking. ..
2. 2. Identify the location of penetrating scratches by leaking sound or wind pressure.
For example, the leaked sound generated by supplying or sucking an arbitrary fluid (basically gas) can be checked by listening or using a device equipped with a microphone (self-propelled device moving along a rope, drone, etc.). Detect and identify the position by the loudness of the sound. Alternatively, the wind pressure generated by supplying or sucking arbitrary gas is detected using a device equipped with a pressure sensor (self-propelled device moving along a rope, drone, etc.) to identify the location of the penetrating scratch. To do.
3. 3. Identify the location of the penetrating scratch with the leak check solution.
While supplying air to the through hole H1 for inspection, a leak check solution such as an effervescent solution is used to identify the location of the through scratch.
　上記の方法等によって、貫通傷の場所を特定したら、貫通傷の補修を行う。
　貫通傷の補修は、被覆を溶融して同材質の溶着材料で密封することを基本とし、ロープ高所作業等で行うためにこれが困難な箇所は、ブチルゴムパテの充填、あるいは被覆表層の溶融密封によって密封する。ただし、ブチルゴムパテを充填する際は、フィラメントテープを巻いて抜け出しを防ぎ、自己融着テープを巻き重ねて耐候性を確保する。被覆貫通孔が小さくて上記の補修が困難な場合は、孔の周囲を切除して拡大する。なお、ブチルゴムパテの充填等の、穴に補修材や接着剤等を充填する際には、図２で説明した方法によって密閉式ワイヤロープ１０内を減圧しながら作業を行うことで、充填をより確実なものとすることができる。
　貫通傷の補修後、実施形態１の点検方法によって貫通傷があるか否かを確認し、貫通傷がある場合には上記の貫通傷の場所特定・補修の作業を再度行い、貫通傷がなくなったら、密閉式ワイヤロープ１０内の通風・乾燥のための準備を行う。 After identifying the location of the penetrating scratch by the above method or the like, the penetrating scratch is repaired.
Repair of penetrating scratches is basically done by melting the coating and sealing it with a welding material of the same material, and where it is difficult to do this because it is done at a high place such as rope, fill with butyl rubber putty or melt seal the coating surface layer. Seal with. However, when filling the butyl rubber putty, a filament tape is wrapped to prevent it from coming off, and a self-bonding tape is wrapped to ensure weather resistance. If the covering through hole is small and the above repair is difficult, the circumference of the hole is excised and enlarged. When filling the holes with a repair material, an adhesive, or the like, such as when filling a butyl rubber putty, the inside of the closed wire rope 10 is depressurized by the method described in FIG. It can be assured.
After repairing the penetrating scratch, it is confirmed whether or not there is a penetrating scratch by the inspection method of the first embodiment, and if there is a penetrating scratch, the above-mentioned work of identifying and repairing the penetrating scratch is performed again, and the penetrating scratch disappears. Then, prepare for ventilation and drying in the closed wire rope 10.
　図７は、密閉式ワイヤロープ１０内の送気乾燥用の機材を設置した状態を示す概略図である。
　実施形態１の点検方法において使用した点検用の貫通穴Ｈ１や送吸気路（パイプ等）１をそのまま使用して、送吸気路１に、コンプレッサ８、減圧弁６、エアバルブ７、除湿器９、フィルタＦを接続する。また、圧力計４を設けていた貫通穴Ｈ２に湿度計Ｈｍ１を接続する。
　また、密閉式ワイヤロープ１０の高部側に、給排気用の貫通穴Ｈ３を形成し、ここからの排気の湿度を測定できるように湿度計Ｈｍ２を設置する。
　給排気用の貫通穴Ｈ３は、点検用の貫通穴Ｈ１と同様に、密閉式ワイヤロープ１０の断面視において、その上端部を０°、下端部を１８０°とした場合に、９０°から１７０°の範囲となる箇所に形成する（図３参照）。雨水の浸入を低減するためである。 FIG. 7 is a schematic view showing a state in which the equipment for air supply drying in the closed wire rope 10 is installed.
Using the through hole H1 for inspection and the air supply / intake path (pipe, etc.) 1 used in the inspection method of the first embodiment as they are, the compressor 8, the pressure reducing valve 6, the air valve 7, the dehumidifier 9, Connect the filter F. Further, the hygrometer Hm1 is connected to the through hole H2 provided with the pressure gauge 4.
Further, a through hole H3 for air supply / exhaust is formed on the high portion side of the closed wire rope 10, and a hygrometer Hm2 is installed so that the humidity of the exhaust gas from the through hole H3 can be measured.
Similar to the through hole H1 for inspection, the through hole H3 for air supply and exhaust is 90 ° to 170 when the upper end portion is 0 ° and the lower end portion is 180 ° in the cross-sectional view of the closed wire rope 10. It is formed in the range of ° (see Fig. 3). This is to reduce the ingress of rainwater.
　図７のように送気乾燥用の機材の設置ができたら、コンプレッサ８を作動させ、除湿器９によって乾燥させた空気を、密閉式ワイヤロープ１０内に送気する。即ち、点検用の貫通穴Ｈ１と給排気用の貫通穴Ｈ３の間において通風を行う。
　湿度計Ｈｍ１、２によってロープ内の湿度を所定間隔で計測し、湿度低下が収束したら（若しくは湿度が所定値以下となったら）、送気乾燥処理を終了する。
　なお、ここではコンプレッサ８によって空気を送気するものを例としたが、不活性ガスを送気するようにするとより好適である。 After the equipment for air supply drying is installed as shown in FIG. 7, the compressor 8 is operated and the air dried by the dehumidifier 9 is supplied into the closed wire rope 10. That is, ventilation is performed between the through hole H1 for inspection and the through hole H3 for air supply / exhaust.
The humidity in the rope is measured at predetermined intervals by the hygrometers Hm1 and Hm2, and when the humidity decrease converges (or when the humidity becomes less than the predetermined value), the air supply drying process is completed.
Although air is supplied by the compressor 8 here as an example, it is more preferable to supply an inert gas.
　送気乾燥が終了したら、点検用の貫通穴Ｈ１と給排気用の貫通穴Ｈ３（及び貫通穴Ｈ２）を塞ぐ。これらの貫通穴を塞ぐ方法としては、上記した貫通傷の補修と同様に、被覆を溶融して同材質の溶着材料で密封するものであっても良いが、貫通穴を開閉可能な開閉部材（密閉可能な開閉部材）を取り付けるようにすると、再度の点検や補修の際により迅速な作業をすることが可能となり、好適である。 When the air supply drying is completed, the through hole H1 for inspection and the through hole H3 (and the through hole H2) for air supply and exhaust are closed. As a method of closing these through holes, the coating may be melted and sealed with a welding material of the same material as in the above-mentioned repair of through scratches, but an opening / closing member capable of opening and closing the through holes ( It is preferable to attach a sealable opening / closing member) because it enables quicker work during re-inspection or repair.
　図８、９には、貫通穴を開閉可能な開閉部材の一例を示した。
　図８（ａ）で示した例は、貫通穴Ｈ１を形成した箇所に対して、密閉式ワイヤロープ１０を全周的に覆うゴム板１６を設け、バンド１７を取付けてボルト１８で締めることで、ゴム板１６を貫通穴Ｈ１の周囲にゴム板１６を密着させ、貫通穴Ｈ１を密閉するものである。ボルト１８を外し、バンド１７及びゴム板１６を外すことで、貫通穴Ｈ１を再度の点検や補修に使用することができる。なお、貫通穴Ｈ１にブチルゴムパテ等を充填した上で、密閉するものであってもよい。
　図８（ｂ）で示した例は、図８（ａ）で示した例とゴム板１６やバンド１７は同様の構成であり、さらに、バンド１７に開閉弁１９を設けるようにしたものである。このようにすることで、より容易に貫通穴を開閉操作することができる。
　図９で示した例は、貫通穴Ｈ１にブチルゴムパテ等の充填材を充填した上で、貫通穴Ｈ１を形成した箇所に対して、密閉式ワイヤロープ１０を全周的に覆う熱収縮チューブ２０を設けた例である。熱収縮チューブ２０の熱収縮により、充填材を充填した貫通穴Ｈ１を密閉するものである。 8 and 9 show an example of an opening / closing member capable of opening / closing a through hole.
In the example shown in FIG. 8A, a rubber plate 16 is provided to cover the entire circumference of the sealed wire rope 10 at a portion where the through hole H1 is formed, a band 17 is attached, and the rubber plate 18 is fastened with a bolt 18. , The rubber plate 16 is brought into close contact with the rubber plate 16 around the through hole H1 to seal the through hole H1. By removing the bolt 18, and removing the band 17 and the rubber plate 16, the through hole H1 can be used for re-inspection and repair. The through hole H1 may be filled with butyl rubber putty or the like and then sealed.
In the example shown in FIG. 8B, the rubber plate 16 and the band 17 have the same configuration as the example shown in FIG. 8A, and the band 17 is provided with an on-off valve 19. .. By doing so, the through hole can be opened and closed more easily.
In the example shown in FIG. 9, the through hole H1 is filled with a filler such as butyl rubber putty, and the heat-shrinkable tube 20 covers the portion where the through hole H1 is formed with the closed wire rope 10 all around. Is an example of providing. The through hole H1 filled with the filler is sealed by the heat shrinkage of the heat shrink tube 20.
　以上のごとく、本実施形態の密閉式ワイヤロープの補修方法によれば、効率的かつ効果的に、密閉式ワイヤロープの補修を行うことができる。 As described above, according to the method for repairing the closed wire rope of the present embodiment, the closed wire rope can be repaired efficiently and effectively.
　なお、実施形態２では、送気乾燥として、点検用の貫通穴Ｈ１から送気して給排気用の貫通穴Ｈ３から排気させるものを例としているが、点検用の貫通穴Ｈ１と給排気用の貫通穴Ｈ３の間において通風を行うものであればよく、どちら側から、送気若しくは吸気の何れを行うか等は任意であってよい。
　密閉式ワイヤロープ内を、上から下へ向かう方向で通風すると、密閉式ワイヤロープ１０内の水分をロープの低部側に集約させる効果が得られ、点検用の貫通穴Ｈ１からの水抜きができるためより好適である。 In the second embodiment, as an example of air supply drying, air is supplied from the through hole H1 for inspection and exhausted from the through hole H3 for air supply / exhaust, but the through hole H1 for inspection and the air supply / exhaust Anything may be used as long as ventilation is performed between the through holes H3 of the above, and it may be arbitrary from which side air is supplied or air is taken in.
When the inside of the closed wire rope is ventilated in the direction from top to bottom, the effect of concentrating the moisture in the closed wire rope 10 on the lower side of the rope is obtained, and the water is drained from the through hole H1 for inspection. It is more suitable because it can be done.
　各実施形態では、密閉式ワイヤロープに事後的に点検等のための貫通穴を形成するものを例としているが、橋梁の建造の際に、点検用の貫通穴や給排気用の貫通穴が予め形成されているワイヤロープを用いることで、点検や補修をより迅速にすることができる。予め形成している点検用の貫通穴や給排気用の貫通穴に対しては、上記例示したような開閉部材（その他、貫通穴を開閉できる任意の部材であってよい）が設けられる。
　当該ワイヤロープは、「被覆に、点検用の貫通穴や給排気用の貫通穴が予め形成されており、当該点検用の貫通穴や給排気用の貫通穴を開閉可能な開閉部材を備えている、密閉式ワイヤロープ」である。 In each embodiment, a through hole for inspection or the like is formed in the closed wire rope after the fact, but when constructing a bridge, a through hole for inspection or a through hole for air supply / exhaust is provided. By using a pre-formed wire rope, inspection and repair can be made more quickly. An opening / closing member as illustrated above (in addition, any member capable of opening / closing the through hole) is provided for the through hole for inspection and the through hole for air supply / exhaust that are formed in advance.
The wire rope is provided with an opening / closing member in which a through hole for inspection and a through hole for air supply / exhaust are formed in advance in the coating, and the through hole for inspection and the through hole for air supply / exhaust can be opened and closed. It is a closed wire rope.
　なお、実施形態においては、斜張橋を例としているが、本発明の適用をこれに限るものではなく、吊り橋等の各種の橋梁に使用されている密閉式ワイヤロープに適用することができる。 Although the cable-stayed bridge is taken as an example in the embodiment, the application of the present invention is not limited to this, and the present invention can be applied to a closed wire rope used for various bridges such as a suspension bridge.
　１００．．．橋梁（斜張橋）
　１０．．．密閉式ワイヤロープ
　Ｈ１．．．点検用の貫通穴
　Ｈ３．．．給排気用の貫通穴 100. .. .. Bridge (cable-stayed bridge)
10. .. .. Sealed wire rope H1. .. .. Through hole for inspection H3. .. .. Through hole for air supply and exhaust

Claims (19)

  1. 　橋梁に使用されている被覆付きの密閉式ワイヤロープの点検方法であって、
    　前記密閉式ワイヤロープの被覆に点検用の貫通穴を形成するステップと、
    　前記点検用の貫通穴から、前記密閉式ワイヤロープの被覆の内側に対する加圧若しくは減圧を行うステップと、
    　前記加圧若しくは減圧の状態が維持されるか否かによって、前記密閉式ワイヤロープの被覆に貫通傷があるか否かを判別するステップと、
    　を有することを特徴とする密閉式ワイヤロープの点検方法。     This is a method of inspecting a sealed wire rope with a coating used for bridges.
    A step of forming a through hole for inspection in the coating of the sealed wire rope,
    A step of pressurizing or depressurizing the inside of the coating of the sealed wire rope from the through hole for inspection, and
    A step of determining whether or not there is a penetrating scratch in the coating of the sealed wire rope depending on whether or not the state of pressurization or depressurization is maintained, and
    A method of inspecting a closed wire rope, which comprises having.
  2. 　橋梁に使用されている被覆付きの密閉式ワイヤロープの点検方法であって、
    　前記密閉式ワイヤロープの被覆に点検用の貫通穴を形成するステップと、
    　前記点検用の貫通穴から、前記密閉式ワイヤロープの被覆の内側に対して加圧若しくは減圧を行うステップと、
    　漏洩音の有無によって、前記密閉式ワイヤロープの被覆に貫通傷があるか否かを判別するステップと、
    　を有することを特徴とする密閉式ワイヤロープの点検方法。     This is a method of inspecting a sealed wire rope with a coating used for bridges.
    A step of forming a through hole for inspection in the coating of the sealed wire rope,
    A step of pressurizing or depressurizing the inside of the coating of the sealed wire rope from the through hole for inspection.
    A step of determining whether or not there is a penetration scratch in the coating of the sealed wire rope based on the presence or absence of leakage sound, and
    A method of inspecting a closed wire rope, which comprises having.
  3. 　前記加圧若しくは減圧による大気圧との差圧が８×１０３Ｐａ以上となるようにすることを特徴とする請求項２に記載の密閉式ワイヤロープの点検方法。 The method for inspecting a closed wire rope according to claim 2, wherein the pressure difference from the atmospheric pressure due to pressurization or depressurization is 8 × 10 3 Pa or more.
  4. 　橋梁に使用されている被覆付きの密閉式ワイヤロープの点検方法であって、
    　前記密閉式ワイヤロープの被覆に点検用の貫通穴を形成するステップと、
    　前記点検用の貫通穴から、撮像装置によって撮像可能な検知用ガスを注入するステップと、
    　前記撮像装置によって、前記密閉式ワイヤロープの被覆の外部への前記検知用ガスの漏出が撮像されたか否かによって、前記密閉式ワイヤロープの被覆に貫通傷があるか否かを判別するステップと、
    　を有することを特徴とする密閉式ワイヤロープの点検方法。     This is a method of inspecting a sealed wire rope with a coating used for bridges.
    A step of forming a through hole for inspection in the coating of the sealed wire rope,
    A step of injecting a detection gas that can be imaged by an imaging device through the inspection through hole, and
    A step of determining whether or not there is a penetration scratch in the coating of the sealed wire rope depending on whether or not the leakage of the detection gas to the outside of the coating of the sealed wire rope is imaged by the imaging device. ,
    A method of inspecting a closed wire rope, which comprises having.
  5. 　前記点検用の貫通穴を、前記橋梁に設置された前記密閉式ワイヤロープの低部側に形成することを特徴とする請求項１から４の何れかに記載の密閉式ワイヤロープの点検方法。 The method for inspecting a closed wire rope according to any one of claims 1 to 4, wherein the through hole for inspection is formed on the lower side of the closed wire rope installed on the bridge.
  6. 　前記点検用の貫通穴を、前記橋梁に設置された前記密閉式ワイヤロープの低部側に形成し、当該点検用の貫通穴から、吸気を行うことによって、前記密閉式ワイヤロープの被覆の内側に対する減圧を行うことを特徴とする請求項１から３の何れかに記載の密閉式ワイヤロープの点検方法。 The inspection through hole is formed on the lower side of the closed wire rope installed on the bridge, and air is taken from the inspection through hole to be inside the coating of the closed wire rope. The method for inspecting a closed wire rope according to any one of claims 1 to 3, wherein the pressure is reduced.
  7. 　前記密閉式ワイヤロープの低部側に形成した前記点検用の貫通穴から、前記密閉式ワイヤロープの被覆の内側に溜まった水の水抜きを行うことを特徴とする請求項５又は６に記載の密閉式ワイヤロープの点検方法。 The fifth or sixth aspect of claim 5 or 6, wherein the water accumulated inside the coating of the closed wire rope is drained from the through hole for inspection formed on the lower side of the closed wire rope. How to check the sealed wire rope.
  8. 　前記密閉式ワイヤロープの低部側に形成した前記点検用の貫通穴から、水より比重の重い流体を注入することによって、前記点検用の貫通穴より低い位置に溜まっている水の水位を上昇させて前記水抜きを行うことを特徴とする請求項７に記載の密閉式ワイヤロープの点検方法。 By injecting a fluid having a specific gravity heavier than water from the through hole for inspection formed on the lower side of the closed wire rope, the water level of water accumulated at a position lower than the through hole for inspection is raised. The method for inspecting a closed wire rope according to claim 7, wherein the water is drained.
  9. 　前記点検用の貫通穴を、前記密閉式ワイヤロープの断面視において、その上端部を０°、下端部を１８０°とした場合に、９０°から１７０°の範囲となる箇所に形成することを特徴とする請求項１から８の何れかに記載の密閉式ワイヤロープの点検方法。 The through hole for inspection is formed at a position in the range of 90 ° to 170 ° when the upper end portion is 0 ° and the lower end portion is 180 ° in the cross-sectional view of the closed wire rope. The method for inspecting a sealed wire rope according to any one of claims 1 to 8.
  10. 　前記密閉式ワイヤロープの被覆に貫通傷が見つかった場合に、当該貫通傷の位置を探索するステップを有することを特徴とする請求項１から９の何れかに記載の密閉式ワイヤロープの点検方法。 The method for inspecting a sealed wire rope according to any one of claims 1 to 9, further comprising a step of searching for the position of the penetrating scratch when a penetrating scratch is found in the coating of the sealed wire rope. ..
  11. 　前記漏洩音の発生位置を探索することにより、前記貫通傷の位置を探索することを特徴とする請求項２に記載の密閉式ワイヤロープの点検方法。 The method for inspecting a closed wire rope according to claim 2, wherein the position of the penetrating scratch is searched by searching for the position where the leaked sound is generated.
  12. 　前記検知用ガスの漏出位置を探索することにより、前記貫通傷の位置を探索することを特徴とする請求項４に記載の密閉式ワイヤロープの点検方法。 The method for inspecting a closed wire rope according to claim 4, wherein the position of the penetrating scratch is searched by searching for the leak position of the detection gas.
  13. 　請求項１０から１２の何れかに記載の密閉式ワイヤロープの点検方法の後に行う密閉式ワイヤロープの補修方法であって、
    　前記貫通傷を補修するステップと、
    　前記点検用の貫通穴とは別に、前記密閉式ワイヤロープの被覆に給排気用の貫通穴を形成するステップと、
    　前記点検用の貫通穴と前記給排気用の貫通穴の間において、通風を行うステップと、
    　前記点検用の貫通穴及び前記給排気用の貫通穴を塞ぐステップと、
    　を有することを特徴とする密閉式ワイヤロープの補修方法。     A method for repairing a closed wire rope, which is performed after the method for inspecting a closed wire rope according to any one of claims 10 to 12.
    The step of repairing the penetrating scratch and
    In addition to the through hole for inspection, a step of forming a through hole for air supply / exhaust in the coating of the closed wire rope, and
    A step of ventilating between the through hole for inspection and the through hole for air supply / exhaust,
    A step of closing the through hole for inspection and the through hole for air supply / exhaust, and
    A method of repairing a closed wire rope, which comprises having.
  14. 　前記通風を、不活性ガスによって行うことを特徴とする請求項１３に記載の密閉式ワイヤロープの補修方法。 The method for repairing a closed wire rope according to claim 13, wherein the ventilation is performed by an inert gas.
  15. 　前記点検用の貫通穴及び前記給排気用の貫通穴を塞ぐステップを、前記点検用の貫通穴及び前記給排気用の貫通穴に、貫通穴を開閉可能な開閉部材を取り付けることにより行うことを特徴とする請求項１３又は１４に記載の密閉式ワイヤロープの補修方法。 The step of closing the through hole for inspection and the through hole for air supply / exhaust is performed by attaching an opening / closing member capable of opening / closing the through hole to the through hole for inspection and the through hole for air supply / exhaust. The method for repairing a closed wire rope according to claim 13 or 14.
  16. 　前記給排気用の貫通穴を、前記橋梁に設置された前記密閉式ワイヤロープの高部側に形成することを特徴とする請求項１３から１５の何れかに記載の密閉式ワイヤロープの補修方法。 The method for repairing a closed wire rope according to any one of claims 13 to 15, wherein the through hole for air supply / exhaust is formed on the high portion side of the closed wire rope installed on the bridge. ..
  17. 　前記給排気用の貫通穴を、前記密閉式ワイヤロープの断面視において、その上端部を０°、下端部を１８０°とした場合に、９０°から１７０°の範囲となる箇所に形成することを特徴とする請求項１３から１６の何れかに記載の密閉式ワイヤロープの補修方法。 The through hole for air supply / exhaust is formed at a position in the range of 90 ° to 170 ° when the upper end portion is 0 ° and the lower end portion is 180 ° in the cross-sectional view of the closed wire rope. The method for repairing a closed wire rope according to any one of claims 13 to 16.
  18. 　請求項１から１２の何れかに記載の密閉式ワイヤロープの点検方法が使用される密閉式ワイヤロープであって、当該密閉式ワイヤロープの被覆に、前記点検用の貫通穴が予め形成されており、当該点検用の貫通穴を開閉可能な開閉部材を備えることを特徴とする密閉式ワイヤロープ。 A closed wire rope using the method for inspecting a closed wire rope according to any one of claims 1 to 12, wherein a through hole for inspection is previously formed in the coating of the closed wire rope. A sealed wire rope characterized by being provided with an opening / closing member capable of opening / closing the through hole for inspection.
  19. 　請求項１３から１７の何れかに記載の密閉式ワイヤロープの補修方法が使用される密閉式ワイヤロープであって、当該密閉式ワイヤロープの被覆に、前記給排気用の貫通穴が予め形成されており、当該給排気用の貫通穴を開閉可能な開閉部材を備えることを特徴とする密閉式ワイヤロープ。 A closed wire rope using the method for repairing a closed wire rope according to any one of claims 13 to 17, wherein through holes for air supply and exhaust are formed in advance in the coating of the closed wire rope. A sealed wire rope characterized by being provided with an opening / closing member capable of opening / closing the through hole for air supply / exhaust.
PCT/JP2020/012976 2019-07-12 2020-03-24 Sealed wire rope inspection method, sealed wire repair method, and sealed wire rope WO2021009971A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2019-129897 2019-07-12
JP2019129897A JP7258681B2 (en) 2019-07-12 2019-07-12 Sealed wire rope inspection method, sealed wire rope repair method, and sealed wire rope

Publications (1)

Publication Number Publication Date
WO2021009971A1 true WO2021009971A1 (en) 2021-01-21

Family

ID=74209780

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2020/012976 WO2021009971A1 (en) 2019-07-12 2020-03-24 Sealed wire rope inspection method, sealed wire repair method, and sealed wire rope

Country Status (2)

Country Link
JP (1) JP7258681B2 (en)
WO (1) WO2021009971A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2926001A1 (en) * 2021-04-09 2022-10-20 Gd Energy Services S A U Procedure for detecting and repairing defects in penetration seals (Machine-translation by Google Translate, not legally binding)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4285615A (en) * 1978-12-13 1981-08-25 Conoco, Inc. Corrosion resistant tension leg cables
JPS6478139A (en) * 1987-09-21 1989-03-23 Nippon Kokan Kk Method for detecting through-hole of wall surface of object to be inspected
JPH0213254B2 (en) * 1985-10-11 1990-04-03 Nippon Steel Corp
JPH04184133A (en) * 1990-11-19 1992-07-01 Mitsubishi Cable Ind Ltd Detection of pinhole on pipe body

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4184133B2 (en) 2003-04-07 2008-11-19 株式会社豊田中央研究所 Image processing device
JP6478139B2 (en) 2014-03-18 2019-03-06 株式会社リコー Method for manufacturing droplet discharge head

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4285615A (en) * 1978-12-13 1981-08-25 Conoco, Inc. Corrosion resistant tension leg cables
JPH0213254B2 (en) * 1985-10-11 1990-04-03 Nippon Steel Corp
JPS6478139A (en) * 1987-09-21 1989-03-23 Nippon Kokan Kk Method for detecting through-hole of wall surface of object to be inspected
JPH04184133A (en) * 1990-11-19 1992-07-01 Mitsubishi Cable Ind Ltd Detection of pinhole on pipe body

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2926001A1 (en) * 2021-04-09 2022-10-20 Gd Energy Services S A U Procedure for detecting and repairing defects in penetration seals (Machine-translation by Google Translate, not legally binding)

Also Published As

Publication number Publication date
JP2021015044A (en) 2021-02-12
JP7258681B2 (en) 2023-04-17

Similar Documents

Publication Publication Date Title
Ahammed Prediction of remaining strength of corroded pressurised pipelines
Mehrabi In-service evaluation of cable-stayed bridges, overview of available methods and findings
US10001238B2 (en) Repair of pipes
WO2021009971A1 (en) Sealed wire rope inspection method, sealed wire repair method, and sealed wire rope
JP2016188849A (en) Deterioration detection method and corrosion sensor
CA2094013C (en) Corrosion condition evaluation and corrosion protection of unbonded post-tension cables in concrete structures
Feng et al. Suspender replacement for a signature bridge
US20210339497A1 (en) Double Skin Structure With Intersititual Spacer
CN107654789A (en) A kind of analogy method of long oil/gas pipe line dimension repairing process
JP2014081224A (en) Method for detecting water leakage path inside building
DE102007011445B4 (en) Method and apparatus for inspecting a welded hollow section beam
US9921124B2 (en) Apparatus and method for monitoring the integrity of a weld seam
JP2013049452A (en) Method for repairing tank using frp
Kitagawa et al. Assessment of cable maintenance technologies for Honshu-Shikoku Bridges
JP2021015044A5 (en)
Nützel et al. Long‐term corrosion protection for bridge cables with butyl rubber tapes using the ATIS Cableskin® system
JP2010133708A (en) Method and device for inspecting rain leaking in building
US20220127803A1 (en) Long-service-life PWS Cable with Replaceable Sleeve and Shielding gas
JP2011174321A (en) Waterproof structure and waterproof structure forming method
JP3232208U (en) Leakage inspection jig
Gagnon et al. Suspension bridge cable evaluation and maintenance
Faust et al. Suspension bridge cable and suspender rope maintenance
JP3699466B2 (en) Rehabilitation structure of steel underground tank
NL1043190B1 (en) Method for inspection and maintenance of insulated installations.
GB2563628A (en) A pipe seal

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 20838882

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 20838882

Country of ref document: EP

Kind code of ref document: A1