JP4719652B2 - Rust inspection device for cylindrical member with coated surface - Google Patents

Description

  The present invention relates to an apparatus for inspecting rust of a cylindrical member whose surface is coated, and in particular, a cylinder whose surface is suitable for inspecting rust generated on the surface of a cylindrical member in a cylindrical member which is installed at a high place and whose surface is coated. The present invention relates to a rust inspection apparatus for members.

  Normally, steel pipes (cylindrical members) such as chemical plants and nuclear power plants installed not only in the vicinity of the ground outdoors but also in high places are covered with a jacket member such as a heat insulating material or a cold insulation material. Further, it has a cross-sectional structure in which the surface of a heat insulating material or a cold insulating material is covered with a protective material such as a stainless steel sheet.

  And these steel pipes laid outdoors, due to aging deterioration of the jacket member, rainwater enters the steel pipe surface beyond the jacket member, and the steel pipe surface rusts due to the accumulation of rainwater, and the steel pipe The thickness is reduced, and in the worst case, a hole is opened and the fluid in the steel pipe flows out.

  Therefore, in the past, the detection of rust on the surface of the steel pipe was detected without destroying the jacket member on the steel pipe, and when a rusting site was detected, the casing member at the rusting site was removed and repaired. Has already been done. For example, Patent Document 1 is cited as a related technique.

Japanese Patent Laid-Open No. 10-141935

  However, there is always a seam in a steel pipe, and this seam is connected to each other by providing a flange at the end of the steel pipe and joining adjacent flanges together, so that the infiltrated rainwater stays at the corners of the steel pipe and the flange. It is easy and rust often occurs there.

  However, a detection device using, for example, radiation that detects a rusting portion without destroying the jacket member has a narrow detection range even though the device itself is large. Therefore, when detecting the rusting part while moving the detection device on the jacket member on the steel pipe in the longitudinal direction, the detection device is obstructed from moving by the flange. There is a problem that the detection of rusting cannot be sufficiently inspected.

  An object of the present invention is to provide a rust inspection device for a cylindrical member coated with a surface capable of accurately detecting rusting at the end of the cylindrical member as well as not destroying the jacket member on the cylindrical member. It is in.

  In order to achieve the above object, the present invention provides a self-propelled carriage that self-propels in the circumferential direction and the longitudinal direction along the outer periphery of the jacket member that covers the cylindrical member, and the leading end in the moving direction of the self-propelled carriage along the longitudinal direction. The self-propelled carriage is provided with a radiation irradiating unit for irradiating the surface of the cylindrical member with radiation, and a radiation detecting unit for detecting the surface environment of the cylindrical member due to the irradiated radiation.

  According to the present invention, since the radiation irradiating portion is provided at the front end portion in the moving direction of the self-propelled carriage, the cylindrical member can be moved without removing the jacket member by moving the self-propelled carriage toward the end portion of the cylindrical member. Radiation can also be applied to the end portion of the, and the presence or absence of rusting can be detected.

  Therefore, it is possible to obtain a rust inspection device for a cylindrical member coated with a surface capable of accurately detecting rusting at the end of the cylindrical member without destroying the jacket member on the cylindrical member.

  A first embodiment of a rust inspection apparatus for a cylindrical member coated with a surface according to the present invention will be described below with reference to FIGS.

  The outer periphery of the steel pipe 1 that is a cylindrical member is covered with a jacket member 2. The jacket member 2 includes a heat insulating material 3 that covers the surface of the steel pipe 1 and a protective material 4 made of a stainless steel sheet that covers the surface of the heat insulating material 3. Furthermore, the flange 1F is provided in the edge part of the steel pipe 1, and the steel pipe 1 of required length is obtained by connecting the adjacent flange 1F. The periphery of the flange 1F is also covered with a similar jacket member 2.

  A rust inspection device 5 is mounted on the outer periphery of the jacket member 2 of the steel pipe 1 to detect a rust generation site.

  The rust inspection device 5 includes a self-propelled carriage 6 and rust detection means 7 provided at a front end portion of the self-propelled carriage 6 along the longitudinal direction of the steel pipe. The self-propelled carriage 6 includes a casing 8 formed so as to surround the jacket member 2 in the circumferential direction by 180 degrees or more, and a plurality of the casings 8 that support the casing 8 from the surface of the jacket member 2 at a predetermined interval. Traveling wheels, in this case, three traveling wheels 9A to 9C, and these traveling wheels 9A to 9C are configured such that their movement direction and driving are instructed by the control unit 10 by wire or wirelessly. . A hook 8 </ b> H for carrying the rust inspection device 5 is provided on the top of the housing 8.

  On the other hand, the rust detecting means 7 irradiates a plurality of, for example, five neutron irradiation units (radiation irradiation units) 11 </ b> A that irradiate the radiation arranged along the circumferential direction of the outer cover member 2, for example, neutrons of the California 252. And 11E and thermal neutron detectors (radiation detectors) 12A to 12E for detecting thermal neutrons generated by neutrons irradiated by the neutron irradiators 11A to 11E. The thermal neutron detectors 12A to 12E are the neutrons. A vacant room surrounding the irradiation units 11A to 11E is formed, and a measuring element is provided on the wall surface of the vacant room. A detection signal is transmitted from the thermal neutron detectors 12A to 12E to the inspection / measurement unit 13 by wire or wirelessly, and is processed and recorded by the inspection / measurement unit 13.

  Therefore, when inspecting the rust of the steel pipe 1, the hook 8 </ b> H of the housing 8 is lifted by a lift or a crane and mounted on the jacket member 2 of the steel pipe 1. And by carrying out a driving | running | working instruction | indication and a detection instruction | indication with respect to the self-propelled trolley 6 and the rust detection means 7 from the control part 10 and the test | inspection measurement part 13 by radio | wireless or wired, the self-propelled trolley 6 is along the longitudinal direction of the steel pipe 1. While self-propelled, the rust detection means 7 detects rust. Since there is moisture in the rust generation site, thermal neutrons are generated by neutrons irradiated from the neutron irradiation units 11A to 11E of the rust detection means 7, and the number of generations is measured by the thermal neutron detection units 12A to 12E. The inspection / measurement unit 13 can determine the presence or absence of hydrogen atoms, which are rust components, and can determine the rusting site and the five thermal neutron detectors 12A to 12E to determine the site where rusting is large.

  And since the rust detection means 7 is located in the front-end | tip part of the advancing direction of the self-propelled carriage 6, by making a self-propelled carriage drive to the edge part of the steel pipe 1, the rusting in the corner | angular part of the flange 1F and the steel pipe 1 is carried out. The presence or absence of can also be detected accurately.

  FIG. 3 shows a modification of the rust detection means 7 in the first embodiment. Note that the same reference numerals as those in the first embodiment indicate the same components, and thus detailed description thereof is omitted.

  This modification is different from the first embodiment in that the number of neutron irradiation units 11A to 11E in the first embodiment is one.

  One neutron irradiation unit 11 is configured to move along a curved guide rail 14 provided in the housing 6. In other words, the neutron irradiation unit 11 is integrally provided with a gear 15 having the same curvature as the guide rail 14, and a drive motor 16 is fixed to the housing 6 side. A small gear 17 that meshes with the gear 15 is provided. And by rotating the drive motor 16 intermittently, the neutron irradiation part 11 irradiates each thermal neutron detection part 12A-12E intermittently, for example, about 15 second intervals, and irradiates neutron, and the presence or absence of rust Determine.

  According to this modification, in addition to the same effects as those of the first embodiment, since only one neutron irradiation unit 11 is required, the rust detection means 7 has an economical effect.

  FIG. 4 shows a second embodiment of a rust inspection device for a cylindrical member whose surface is coated. Note that the same reference numerals as those in the first embodiment indicate the same components, and thus detailed description thereof is omitted.

  This embodiment differs from the first embodiment in that the neutron irradiation units (radiation irradiation units) 11 and 11A to 11E and the thermal neutron detection unit (radiation detection unit) 12A in the first embodiment. Instead of -12E, an X-ray irradiation unit (radiation irradiation unit) 18 that irradiates X-rays, and an X-ray detection unit (radiation detection unit) 19 that forms a transmission image of the surface of the steel pipe 1 by the irradiated X-rays. And the point that the driven wheel 9D is provided in the casing 8 in the vicinity of the X-ray irradiation unit 18 to support the load of the heavy X-ray irradiation unit 18.

  That is, by setting the central axis of X-rays irradiated from the X-ray irradiation unit 18 to coincide with the tangential direction of the outer surface of the steel pipe 1 and receiving it by the X-ray detection unit 19, If there is rust on the surface, the portion with rust has a coarse metal density and X-rays can easily pass through, so that the X-ray detector 19 can form an image as a contrast ratio with the portion without rust.

  Note that the control and measurement unit 20 controls and determines all of the traveling of the self-propelled carriage 6 and the X-ray irradiation and image processing.

  Also according to the present embodiment, the same effects as those of the first embodiment can be obtained.

  By the way, in order to stabilize the traveling of the self-propelled carriage 6, traveling wheels 9A to 9C are installed in the housing 8 at intervals of 120 degrees. As a result, the distance between the traveling wheels 9B and 9C located at both ends in the circumferential direction of the casing 8 becomes smaller than the outer diameter of the jacket member 2, and the casing 8 cannot be mounted on the outer periphery of the jacket member 2. . Therefore, a part 8A at the circumferential end of the housing 8 is configured to be bent outward through a hinge. With this configuration, when the casing 8 is attached to the jacket member 2, a part 8 </ b> A of the circumferential end portion of the casing 8 can be bent and attached to the outside. After the mounting, a part 8A of the circumferential end of the housing 8 may be returned to the original position and fixed.

  Next, an example in which the rust inspection device 5 of each of the above embodiments is mounted on the jacket member 2 that covers the surface of the steel pipe 1 will be described with reference to FIGS.

  Usually, a gantry 22 having cross beams 21A and 21B located at a height of 5 to 10 m is erected with respect to the ground GL at intervals of 10 to 15 m, and a plurality of steel pipes 1A and 1B are placed on these cross beams 21A and 21B. I support you. In order to detect the rusting part of these steel pipes 1A and 1B, when attaching the rust inspection device 5 to the steel pipes 1A and 1B, several workers are installed on the rust inspection device 5 assembled with a scaffold and suspended by a crane or the like. There is a method of attaching to the steel pipes 1A and 1B by hanging. For that purpose, it is necessary to build a scaffold at each position where the gantry 22 is erected and move the crane.

  However, the above work can be reduced by using the assistant robot 30. That is, the assistant robot 30 is supported by a traveling carriage 32 provided with a control unit 31, a support shaft 33 that stands upright on the traveling carriage 32 and moves up and down, and can tilt with respect to the support shaft 33. A suspension arm 34 that advances and retreats in the longitudinal direction, and a suspension portion 35 that is connected to the tip of the suspension arm 34 via a universal joint. The suspension portion 35 is engaged with the hook 8H of the housing 8. An engaging pin 36 to be engaged and a driving machine 37 for driving the engaging pin 36 to engage / disengage the hook 8H are provided.

  And when attaching the rust inspection device 5 to the steel pipe 1A or 1B, as shown in FIG. 6, the rust inspection device 5 is suspended from the suspension portion 35 at the tip of the suspension arm 34, the support shaft 33 is raised, Further, the suspension arm 34 is moved back and forth and the inclination angle is adjusted to approach the steel pipe 1B to be inspected, and a part 8A of the housing 8 is opened and attached to the steel pipe 1B. After the rust inspection device 5 is mounted, the rusting portion is detected as described above.

  Then, as shown in FIG. 7, it moves in the direction of the broken line arrow A to detect a rusting portion over the entire length of the steel pipe 1B. When the self-propelled carriage 6 reaches the flange 1F, it is suspended by the assistant robot 30. As shown by the broken arrow B, the rust inspection device 5 is moved to the adjacent steel pipe 1 side, and then the self-propelled carriage 6 is moved to detect the rusting site.

  Thus, the self-propelled carriage 6 can be attached to the necessary steel pipe 1A or 1B by the control unit 31 of the assistant robot 30 and can pass through the flange 1F. Detection of rust sites can be performed.

  In addition, although the example which suspends and installs the rust inspection apparatus 5 as shown in FIG. 6 using the assistant robot 30 was demonstrated, as shown to FIG. The rust inspection device 5 may be mounted upward from below.

1 shows a first embodiment of a rust inspection device for a cylindrical member coated with a surface according to the present invention, wherein (a) is a plan view, (b) is a sectional view taken along line AA in (a), and (c) is ( BB sectional drawing of a). The neutron irradiation part and thermal neutron detection part of the rust inspection apparatus of FIG. 1 are shown, (a) is an end view, (b) is a developed view. The modification of the neutron irradiation part of FIG. 2 and a thermal neutron detection part is shown, (a) is an end elevation, (b) is an expanded view, (c) is CC sectional drawing of (a). The 2nd Embodiment of the rust inspection apparatus of the cylindrical member by which the surface was coat | covered by this invention is shown, (a) is FIG. 1 (a) equivalent view, (b) is DD sectional drawing of (a). The assistant robot for mounting | wearing the steel pipe of the rust inspection apparatus by this invention is shown, (a) is sectional drawing, (b) is a side view. Sectional drawing which shows the mounting state to the steel pipe of the rust inspection apparatus using an assistant robot. The side view explaining the transition state of the rust inspection apparatus in the flange of a steel pipe.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1,1A, 1B ... Steel pipe, 2 ... Cover member, 5 ... Rust inspection apparatus, 6 ... Self-propelled cart, 7 ... Rust detection means, 8 ... Housing, 11A-11E ... Neutron irradiation part (radiation irradiation part), 12A to 12E ... thermal neutron detection part (radiation detection part), 18 ... X-ray irradiation part (radiation irradiation part), 19 ... X-ray detection part (radiation detection part).

Claims (1)

In the surface rust inspection apparatus for a cylindrical member whose surface is covered with a jacket member, a self-propelled carriage that self-runs in the circumferential direction and the longitudinal direction on the outer periphery of the jacket member of the cylindrical member is provided, and the longitudinal direction of the cylindrical member is provided. A neutron irradiation unit that irradiates the surface of the cylindrical member with neutrons at an end portion of the self-propelled carriage along, and a thermal neutron detection unit that detects thermal neutrons generated on the surface of the cylindrical member by the irradiated neutrons In addition, a plurality of the thermal neutron detectors are arranged facing the circumferential direction of the cylindrical member so that one neutron irradiation unit can move with respect to each of the thermal neutron detectors arranged in a plurality. A surface rust inspection device for a cylindrical member coated with a surface, characterized in that it is configured .

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