JP4885531B2 - Observation jig and coating method in steel pipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an observation jig which allows the observer to sufficiently check a soiled state of a water cutoff plate etc. in a steel pipe. <P>SOLUTION: The observation jig 18 is for use in observing the interior of the steel pipe 10 of a structure which is constructed by connecting the steel pipe 10 and a steel pipe 11 together via the water cutoff plate 14, and has drain gutters 15, 16 formed therein each extending from one edge to the other edge of an upper surface of the water cutoff plate 14. Specifically the observation jig 18 holds an observation means 25 for observing the interior of the steel pipe 10 by being inserted into the steel pipe 10 from one opening 15a of the drain gutter 15. The observation jig 18 is formed of: a base member 19 being inserted from one opening 15b of the drain gutter 15 into the steel pipe 10; a movable member 20 being inserted from the one opening 15b into the steel pipe together with the base member 19, holding the observation means 25, and being movable upward and downward; and an operating member 21 for moving the movable member 20 upward and downward. <P>COPYRIGHT: (C)2007,JPO&amp;INPIT

Description

  The present invention relates to, for example, an observation jig for holding observation means for observing the inside of a steel pipe of a steel tower, and a coating method in the steel pipe.

  Conventionally, a cleaning tool for cleaning the inside of a steel pipe of a steel tower is known (see Patent Document 1).

  Such a cleaning tool is provided with a curved leaf spring at the tip of the tube, this tube is passed through the guide pipe, the tip and the rear of the tube are projected from the guide pipe, and the rear end of the tube is subjected to rotational force. It connects to the drive part to give.

  When cleaning the steel pipe of the steel tower, first, the tube is passed through the guide pipe as described above, and this guide pipe is inserted from one end opening of the drainage groove of the water shielding plate of the steel tower and inserted into the steel pipe. And by connecting the rear-end part of a tube to a drive part and rotating a tube, a leaf | plate spring is rotated and the foreign material and rust which were stored in the steel pipe are grind | pulverized.

In addition, a guide pipe is inserted from one end opening of the drainage groove of the water shielding plate, a tube having a paint jet outlet at the tip is passed through the guide pipe, and paint is jetted from the paint jet outlet to coat the inside of the steel pipe. A coating method is known (see Patent Document 2).
JP 2003-200124 A Registered Utility Model Publication No. 3056658 Publication

  By the way, conventionally, since the inside of the steel pipe of the steel tower is not visible, cleaning is performed regardless of the dirt in the steel pipe. For this reason, useless cleaning may be performed. Moreover, even if the inside of the steel pipe of the steel tower is cleaned, there is a problem that it cannot be confirmed whether the cleaning is actually performed.

  In order to check the state of dirt in the steel pipe and after cleaning, the fiberscope can be inserted through the opening of one end of the drainage groove of the water shielding plate and look inside the steel pipe. There was a problem that the state of dirt on the upper surface of the water plate could not be sufficiently confirmed.

  Moreover, in the conventional coating method, since the state of dirt in the steel pipe is not known, there is a problem that the inside of the steel pipe is painted in a dirty state.

  An object of the present invention is to provide an observation jig capable of sufficiently confirming the state of dirt such as a water shielding plate in a steel pipe of a steel tower, and a method for painting a steel pipe without coating the dirty steel pipe. It is to provide.

The invention according to claim 1 is a structure in which a steel pipe and a steel pipe are joined via a water shielding plate, and a drainage groove is formed from one end of the upper surface of the water shielding plate to the other end. An observation jig for holding an observation means for observing the inside of the steel pipe by inserting it into the steel pipe from the opening,
A base member that is inserted into the steel pipe from one end opening of the drainage groove, a moving member that is inserted into the steel pipe from the one end opening together with the base member, and that can move up and down, and the moving member. for example Bei and an operation member which is moved up and down,
The moving member is overlaid on the base member and is provided so as to be rotatable around the tip side of the base member, and holds the observation means at the rear part thereof,
The operating member is composed of an elastic band, one end side of the band is fixed to the bottom surface of the moving member, and the other end side of the band is slidably attached to the upper surface of the base member.
When the other end side of the band is moved to the tip side of the base member, the moving member is rotated by curving the band .

The invention of claim 2 observes the inside of the steel pipe using the observation jig according to claim 1, and then inserts a stirring member into the steel pipe from one end opening of the drainage groove. Clean the inside of the steel pipe by rotating it,
After this, the one end opening of the drainage groove is closed and the paint is injected from the other end opening into the steel pipe to a predetermined height,
Thereafter, the one end opening is opened, and the injected paint is discharged from the one end opening to coat the inside of the steel pipe .

The invention of claim 3 is characterized in that after the inside of the steel pipe is cleaned, the inside of the steel pipe is observed using the observation jig to confirm the state after the cleaning .

  According to the present invention, since the moving member moves the observation means up and down by operating the operation member, the water shielding plate can be observed from above, and therefore, the dirt of the water shielding plate and the like in the steel pipe can be observed. The state can be confirmed sufficiently.

  Moreover, according to the coating method in the steel pipe, the dirty steel pipe is not painted.

  Hereinafter, an embodiment as an embodiment of an observation jig and a coating method in a steel pipe according to the present invention will be described with reference to the drawings.

  FIG. 1 shows, for example, joints between main column steel pipes (hereinafter referred to as steel pipes) 10 and 11 of a power transmission tower. A flange 12 is integrally formed at the lower part of the upper steel pipe 10, and a flange 13 is integrally formed at the upper part of the lower steel pipe 11. In addition, the lower steel pipe 11 consists of a comparatively short thing, The lower part is being fixed to the concrete foundation (not shown).

  The flanges 12 and 13 are fixed by a plurality of bolts (not shown) with a water shielding plate 14 interposed therebetween.

  FIG. 6 shows a plan view of the water shielding plate 14 as seen from the joint surface between the flange 12 and the water shielding plate 14. As shown in FIG. 6, a pair of drainage grooves 15 and 16 are formed on the upper surface of the water shielding plate 14 so as to intersect each other.

  Drain ports (drain holes) 15a and 15b are formed at each end of the drain groove 15 by the drain groove 15 and the flange 12 on the upper side. Similarly, each end of the drain groove 16 has an opening at one end. The drain ports 16a and 16b are respectively formed.

  In FIG. 1, the code | symbol 18 has shown the observation jig | tool for observing the inside of the steel pipe 10. FIG. Details of the observation jig 18 will be described with reference to FIGS.

  As shown in FIGS. 2 and 3, the observation jig 18 is composed of the following that can be inserted from drain ports 15 a and 15 b described later formed by the water shielding plate 14 and the flange 12. That is, the base member 19, the guide rail 20 that can be tilted with respect to the base member 19, a band (hereinafter referred to as a stainless steel band) 21 as an operation member for tilting the guide rail 20, and the stainless steel band 21 are moved. It is comprised from the support tool 22 penetrated freely.

  As shown in FIGS. 4A and 4B, the guide rail 20 is formed of a U-shaped member having a longitudinal section opened upward. An elongated hole 23 extending in the width direction is formed in an intermediate portion of the bottom plate 20a of the guide rail 20.

  As shown in FIG. 5, the support tool 22 has a hollow 22a through which the stainless steel band 21 is movably inserted. 2 and 3, the support 22 is fixed to the base member 19 by bonding the lower surface 22b of the support 22 to the upper surface of the base member 19 with a double-sided tape (not shown).

  As shown in FIG. 2, the stainless steel band 21 is inserted through a hollow hole 22 a in the support tool 22, and is inserted through a hole 23 of the guide rail 20 from below to extend into the guide rail 20. .

  Then, after the front end side (left side of the long hole 23 in FIG. 2) of the stainless steel band 21 passes through the guide rail 20, the front end portion 21a is fixed to the front end portion 19A of the base member 19 by a rivet or the like.

  Further, the lower surface 21c of the stainless steel band 21 in the guide rail 20 and the upper surface 20b of the bottom plate 20a (see FIG. 4) of the guide rail 20 are bonded by a double-sided tape (not shown), and the guide rail 20 is attached to the stainless steel band 21. It is fixed to.

  The fiberscope 25 includes a scope unit 25a having an observation window 25b, an eyepiece unit (not shown), and an optical fiber cable 26 connecting the eyepiece unit and the scope unit 25a.

  Further, the fiberscope 25 is inserted into the steel pipe 10 from the drain port 15b (see FIG. 6) of the drainage groove 15 and then inserted from the drainage port 15a on the opposite side of the drainage groove 15 to the guide rail. 20 can be inserted.

[Action]
Next, the effect | action of the observation jig | tool 18 comprised as mentioned above and the coating method of a steel pipe are demonstrated.

  With the guide rail 20 lying on the base member 19 as shown in FIG. 2, the observation jig 18 holds the rear end portion 19 a of the base member 19 from the drain port 15 b of the drain groove 15, for example. Insert into.

  Next, the fiberscope 25 is inserted from the drainage port 15 a opposite to the drainage groove 15, and the fiberscope 25 is put into the guide rail 20. Then, the optical fiber cable 26 is operated so that the scope portion 25 a of the fiber scope 25 protrudes from the rear end portion 20 c of the guide rail 20.

  In this state, when the rear end 21b of the stainless steel band 21 extending from the steel pipe 10 to the outside is operated and pushed in, as shown in FIG. 1 and FIG. The stainless steel band 21 between 22 gradually curves.

  Along with the curvature of the stainless steel band 21, the guide rail 20 is rotated so as to gradually rise around the tip end portion 21a which is one end side (left side in FIG. 3), and as shown in FIG. Inclined state. That is, the scope portion 25a of the fiber scope 25 is in a state where it is lifted to a predetermined height.

  Thereby, the inner wall and the base member 19 in the steel pipe 10 can be observed with the fiber scope 25 as shown in FIGS. 1 and 3. By this observation, for example, accumulated foreign matter such as honeycomb and earth and sand, rust, and the like can be confirmed. When sufficient observation is not performed by this observation, the observation jig 18 is inserted from the other drainage ports 16a and 16b and observed in the same manner.

  After the observation / inspection in the steel pipe 10 is completed, the guide rail 20 falls on the base member 19 as shown in FIG. In this state, the fiberscope 25 is pulled out from the steel pipe 10.

  Thereafter, the observation jig 18 is pulled out from the drain port 15a side from which the fiberscope 25 has been pulled out and removed.

  In this way, by observing the inside of the steel pipe 10 in advance, it is possible to find the steel pipe 10 that requires repair from among many steel towers such as a power transmission tower, and the steel pipe 10 is repaired more efficiently. be able to.

  Next, an example of a repairing method for the steel pipe 10 when the steel pipe 10 requiring repair can be confirmed will be described with reference to FIGS.

  In FIG. 7, reference numeral 28 is a stirring member for pulverizing foreign matter in the steel pipe 10, 30 is a copper pipe for rotatably holding the shaft portion 29 of the stirring member 28, and 32 is for rotating the stirring member 28. It is an electric drill as a driving source of

  As shown in FIG. 8, the agitating member 28 includes a shaft member 29 and a plurality of branch members 29 a to 29 c welded to the shaft member 29 at a predetermined interval. The shaft member 29 includes a plurality of stainless steel members. It is made of steel wire made of wire and has elasticity.

  Each branch member 29a-29c is formed with the strand from the steel which consists of a some wire, and is easy to bend and has elastic force. Each branch member 29a-29c becomes long as it goes to the front-end | tip part (left end part in FIG. 8) side of the shaft member 29, and the diameter of the wire of each branch member 29a-29c is smaller than the diameter of the wire of the shaft member 29. Is set.

  As shown in FIGS. 9 (a) and 9 (b), the pipe 30 has a tip 30a slightly curved upward, and a rod-like handle 30b is fixed to the rear part of the pipe 30.

  Next, a method for cleaning the inside of the steel pipe 10 with the stirring member 28 will be described.

  First, the rear part of the shaft member 29 of the stirring member 28 is inserted from the tip part 30 a of the pipe 30, and the rear part 29 d (see FIG. 7) of the shaft member 29 is protruded from the rear end part 30 c of the pipe 30. That is, the tip end portion of the shaft member 29 of the stirring member 28 protrudes from the tip end portion 30 a of the pipe 30, and the branch members 29 a to 29 c are brought out from the tip end portion 30 a of the pipe 30.

  And the front-end | tip part of the shaft member 29 of the stirring member 28 is inserted in the drain port 15b of the steel pipe 10. FIG. At this time, the branch members 29a to 29c of the stirring member 28 are bent and inserted into the drain port 15b. Further, while pushing the tip of the shaft member 29 of the stirring member 28, the tip of the pipe 30 is inserted into the drain 15b of the steel pipe 10, and as shown in FIG. 7, the tip of the shaft member 29 and the pipe 30 The steel tube 10 is inserted with the tip 30a facing upward.

  When the distal end portion of the shaft member 29 enters the steel pipe 10, as shown in FIG. 7, the distal end portion of the shaft member 29 protrudes obliquely upward because the distal end portion 30a of the pipe 30 faces upward. Further, the branch members 29 a to 29 c of the stirring member 28 extend in a direction orthogonal to the tip end portion of the shaft member 29 because of having an elastic force.

  Next, the rear end portion 29d of the shaft member 29 of the stirring member 28 is connected to the drill 32, the power is turned on, and the shaft member 29 is rotated. Due to the rotation of the shaft member 29, the branch members 29a to 29c rotate together with the shaft member 29 to pulverize foreign matter and rust stored in the steel pipe 10. At this time, if the drill 32 is moved back and forth, foreign matter and rust can be crushed over a wide range in the steel pipe 10.

  After crushing the foreign matter and rust, the stirring member 28 is pulled out from the drain port 15a together with the pipe 30.

  Next, by inserting a wooden square bar (not shown) from the drain ports 15a and 15b and the drain ports 16a and 16b of the steel pipe 10 and moving it back and forth, the crushed foreign matter and rust stored in the drain grooves 15 and 16 are removed. Is pushed out and discharged out of the steel pipe 10. Such crushing / removing work of foreign matter and rust is appropriately performed while grasping the internal state of the steel pipe 10 by the observation jig 18.

  Next, leave either one of the drain ports 15a, 15b or 16a, 16b, close the other drain port with gummed tape, and connect a water supply tube (not shown) to one drain port (for example, the drain port 15b). A drain tube (not shown) is connected to the other drain port (for example, the drain port 15a).

  Clean water is supplied from the water supply tube by a high-pressure cleaning device (not shown), and the foreign matter residue remaining in the steel pipe 10 is discharged from the drain tube, thereby removing the foreign matter residue in the steel pipe 10 to the outside of the steel pipe 10. . After removing the foreign matter residue, warm air is sent into the steel pipe 10 using a drying device (not shown) such as a compressor and a dryer to dry the steel pipe 10.

  Next, painting is performed in the steel pipe 10 after the drying is finished. In this case as well, as in the case of cleaning the inside of the steel pipe 10, the other drainage ports are closed with gum tape or the like except for any two drainage ports 15a, 15b or 16a, 16b.

  FIG. 10 shows a state in which the paint 36 is supplied from one open drain port (for example, the drain port 15b). In FIG. 10, reference numeral 34 denotes a paint tank that stores the paint 36, and the paint tank 34 is connected to the drain port 15 b through a tube 35.

  A certain amount of paint 36 is injected into the steel pipe 10 by tilting the paint tank 34 above the drain port 15b. At the time of injecting the paint, it is also possible to apply a pressure to the paint tank 34 by a foot pump (not shown) to flow the paint 36 into the steel pipe 10.

  As shown in FIG. 11, the paint 36 poured into the steel pipe 10 to a predetermined height is discharged and removed from a drain port (for example, the drain port 15 a). After the coating in the steel pipe 10 is completed and cured for several days, the internal state of the steel pipe 10 is confirmed by the observation jig 18 (see FIG. 1).

  The above-described method for inspecting the inside of the steel pipe 10 using the observation jig 18 is suitable when the diameter of the steel pipe 10 is φ216.3 mm or less, and when the diameter of the steel pipe 10 is φ216.3 mm or more, FIG. The inspection method shown in FIG.

  In this inspection method, first, for example, a guide tube 41 for a fiberscope is inserted from the drain port 15a of the drain groove 15, and the distal end portion 41b of the guide tube 41 is aligned with the inner wall of the steel pipe 10 'as shown in FIG. To move up. This upward movement can be performed by attaching a heel to a state where the distal end portion 41b of the guide tube 41 is curved in advance.

  Then, the fiber scope 25 is inserted from the rear end opening of the guide tube 41, and the scope portion 25a of the fiber scope 25 is pushed out from the distal end portion 41b of the guide tube 41 as shown in FIG. As a result, the scope 25a of the fiberscope 25 faces downward, and the inside of the steel pipe 10 'and the water shielding plate 14 can be observed from above.

  After this observation, the steel pipe 10 'is repaired and painted in the same manner as described above.

  In the above embodiment, the inside of the steel pipes 10 and 10 'is observed using the fiberscope 25. However, the inside of the steel pipes 10 and 10' may be observed using a CCD camera.

It is a vertical side view of the steel pipe connection part to which the observation jig concerning the present invention was applied. Similarly, it is a side view of an observation jig. Similarly, it is an effect | action figure of the observation jig | tool which raised the fiberscope within the steel pipe. Similarly, (a) is a plan view of the guide rail of the observation jig, and (b) is a cross-sectional view taken along line BB in (a). Similarly, it is a support for holding a stainless steel band. Similarly, it is the sectional view on the AA line in FIG. It is a vertical side view of the steel pipe connection part which shows the foreign material crushing condition in a steel pipe. Similarly, it is a side view of a stirring member. Similarly, (a) is a longitudinal side view of a pipe, and (b) is a plan view of the pipe. It is a vertical side view of the steel pipe connection part which shows the coating condition in a steel pipe. It is a vertical side view of the steel pipe connection part which shows the paint discharge condition in a steel pipe. It is a vertical side view of the steel pipe connection part which shows the other observation jig | tool of a steel pipe.

Explanation of symbols

10, 10 'Steel pipe 11 Steel pipe 14 Water shielding plate 15 Drain groove 16 Drain groove 15a, 15b Drain port 16a, 16b Drain port 18 Observation jig 19 Base member 20 Guide rail (moving member)
21 Stainless steel band (operation member)
25,25A Fiberscope (observation means)

Claims (3)

In a structure in which a steel pipe and a steel pipe are joined via a water shielding plate and a drainage groove is formed from one end to the other end of the upper surface of the water shielding plate, the steel pipe is inserted into the steel pipe from one end opening of the drainage groove. An observation jig for holding observation means for observing the inside of the steel pipe,
A base member that is inserted into the steel pipe from one end opening of the drainage groove, a moving member that is inserted into the steel pipe from the one end opening together with the base member, and that can move up and down, and the moving member. for example Bei and an operation member which is moved up and down,
The moving member is overlaid on the base member and is provided so as to be rotatable around the tip side of the base member, and holds the observation means at the rear part thereof,
The operating member is composed of an elastic band, one end side of the band is fixed to the bottom surface of the moving member, and the other end side of the band is slidably attached to the upper surface of the base member.
An observation jig characterized in that, when the other end side of the band is moved to the tip end side of the base member, the moving member is rotated by curving the band . The inside of the steel pipe is observed using the observation jig according to claim 1, and thereafter, the stirring member is inserted into the steel pipe from one end opening of the drainage groove, and the stirring member is rotated to rotate the inside of the steel pipe. Clean the
After this, the one end opening of the drainage groove is closed and the paint is injected from the other end opening into the steel pipe to a predetermined height,
Then, the coating method in the steel pipe is characterized in that the one end opening is opened and the injected paint is discharged from the one end opening to coat the inside of the steel pipe. The method for painting a steel pipe according to claim 2 , wherein after the inside of the steel pipe is cleaned, the inside of the steel pipe is observed using the observation jig to check the state after the cleaning .

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