JPH0933685A - Drain pipe inner diameter measuring device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drain pipe inner diameter measuring device capable of easily measuring the inner diameter. SOLUTION: Provided are a dolly 11 running along a support beam 9 arranged below a reactor pressure vessel so as to pass from the outside of underneath space of the reactor pressure vessel toward immediately below part of nearly center of the lower head of the reactor pressure vessel, a guide part 44 provided on the dolly 11 and capable of attaching to the pipe 5 of which inner diameter is to be measured, a measuring mechanism 22 which is supported capable of elevating by the dolly 11 and is capable of measuring the inner diameter of the pipe 5, and a ball screw 38 which is provided on the dolly 11 and is capable of approaching and leaving the measuring mechanism 22 to the pipe 5 to be measured.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drain pipe inner diameter measuring device for measuring the inner diameter of a cut portion of a drain pipe of a reactor pressure vessel when the drain pipe is renewed.

[0002]

2. Description of the Related Art FIGS. 6 and 7 show a lower end portion of an example of a conventional reactor pressure vessel. The lower portion of such a reactor pressure vessel 1 has an inner bottom portion of the reactor pressure vessel 1. A drain pipe 2 that communicates with the outside is provided.

The drain pipe 2 has a nozzle 4 provided at a substantially central portion of a lower mirror portion 3 of a reactor pressure vessel 1 extending substantially vertically downward and an upper end portion connected to a lower end portion of the nozzle 4. A vertical drain pipe 5 extending downward substantially vertically, and an elbow member 6 having one end connected to a lower end of the vertical drain pipe 5.
And a lateral drain pipe 7 that extends outward from the reactor pressure vessel 1 from directly below the center of the lower mirror portion 3, one end of which is connected to the other end of the elbow member 6.

Conventionally, the lower end of the vertical drain pipe 5 and one end of the elbow member 6, and the other end of the elbow member 6 and the other end of the horizontal drain pipe 7 are connected by a socket welding joint structure. In recent years, in order to further improve the safety of piping equipment attached to a reactor pressure vessel, drain piping 2
Vertical drain pipe 5, elbow member 6, horizontal drain pipe 7
Is being considered for replacement with a butt welded joint structure.

[0005]

However, the lower mirror section 3 of the reactor pressure vessel 1 is provided with a large number of control rod housings 8 extending downward substantially vertically from the lower mirror section 3, and the lower mirror section 3 is also provided. A support beam 9 for supporting the control rod housing 8 and a heat insulation panel 10 for suppressing heat radiation from the reactor pressure vessel 1 to the outside are installed below the portion 3.

Therefore, when the vertical drain pipe 5, the elbow member 6, and the horizontal drain pipe 7 are replaced, the operator measures the inner diameter of the pipe necessary for welding the pipe, so that the operator needs to measure the inner diameter of the lower mirror portion 3. It is not easy to work directly underneath.

The present invention has been made in view of the above situation, and an object of the present invention is to provide a drain pipe inner diameter measuring device capable of easily measuring the inner diameter of a drain pipe.

[0008]

In order to achieve the above object, in a drain pipe inner diameter measuring apparatus according to claim 1 of the present invention, a drain pipe inner diameter measuring device is provided below the reactor pressure vessel from the outside of a space below the reactor pressure vessel. A trolley that travels along a support beam arranged below the reactor pressure vessel so as to go directly under the center of the mirror portion, and a measuring mechanism that is supported by the trolley and can measure the inner diameter of the pipe. A guide member which is provided on the trolley and which can circumscribe a pipe whose inner diameter is to be measured,
An elevating mechanism that is provided on the trolley and that allows the measuring mechanism to move toward and away from the pipe to be measured.

Further, in the drain pipe inner diameter measuring device according to the second aspect of the present invention, the drain pipe inner diameter measuring device is arranged so as to extend from the outside of the lower space of the reactor pressure vessel to just below the center of the lower mirror portion of the reactor pressure vessel. A reference rail arranged below the reactor pressure vessel, a dolly traveling along the reference rail, a measuring mechanism supported by the dolly so as to be vertically movable and capable of measuring the inner diameter of the pipe, and the trolley provided on the dolly. A guide member that is capable of circumscribing a pipe whose inner diameter is to be measured, and an elevating mechanism that is provided on the carriage and that moves the measuring mechanism closer to and away from the pipe to be measured are provided.

In the apparatus for measuring the inner diameter of the drain pipe of the present invention, the trolley is moved from the outside of the space below the nuclear pressure vessel by the support beam or the reference rail disposed directly below the center of the lower mirror of the reactor pressure vessel. The reactor pressure vessel is guided to just below the center of the lower mirror portion, the guide member provided on the carriage is circumscribed to the pipe whose inner diameter is to be measured to fix the carriage at a predetermined position, and the lifting mechanism provided on the carriage. After the measuring mechanism is brought close to the inner surface of the end of the pipe by the method, the measuring mechanism is operated to measure the inner diameter of the end of the pipe.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

1 to 4 show an example of an embodiment of a drain pipe inner diameter measuring device of the present invention, in which the same parts as those in FIG. 7 are designated by the same reference numerals.

In the drain pipe inner diameter measuring device shown in FIGS. 1 to 4, a support provided to support a large number of control rod housings 8 extending downward substantially vertically from the lower mirror portion 3 of the reactor pressure vessel 1. Among the beams 9, a support beam 9 arranged so as to face substantially directly below the central portion of the lower mirror portion 3 of the reactor pressure vessel 1 is provided with a carriage 11 capable of traveling along the support beam 9.

This dolly 11 comprises a dolly body 12, a lower substrate 14 mounted on the dolly body 12 via a miniature LM guide 13, and a linear shaft 1 on the lower substrate 14.
5, and an elevating substrate 18 mounted between the lower substrate 14 and the upper substrate 16 via a linear bush 17 movably fitted on the linear shaft 15 so as to be vertically movable. It is composed of and.

The trolley body 12 is supported by support members 19 which are arranged at predetermined intervals in the width direction at both front and rear ends of the trolley body 12 (each side A and B in FIG. 1).
1 has a cam follower 20 pivotally supported so as to be able to roll in the front-back direction (A-B direction in FIG. 1).
On the outside of the carriage main body 12 in the width direction (CD direction in FIG. 3),
A guide angle 21 is provided which has an inner surface facing the side surface of the support beam 9 and can guide the carriage main body 12 to move along the support beam 9.

Further, the trolley body 12 is provided on the upper surface of the trolley body 1.
2 has a miniature LM guide 13 which is arranged at a predetermined interval in the front-rear direction (A-B direction in FIG. 1) and extends horizontally in the width direction of the carriage main body 12.

The lower substrate 14 is mounted so as to be movable within the predetermined range in the width direction of the carriage main body 12 via the miniature LM guide 13.

Linear shafts 15 extending in parallel with each other in the vertical direction are provided at predetermined positions at four corners of the lower substrate 14, and linear bushes 17 are movably fitted on the linear shafts 15.

The upper substrate 16 is the linear shaft 1 described above.
It is fixed to the upper end portion of 5 and is supported by the linear shaft 15 so as to be parallel to the lower substrate 14, and a measuring mechanism 22 described later can pass in the vertical direction.

The elevating board 18 is fixed at its four corners to the lower end of the linear bush 17, and can be moved up and down along the linear shaft 15 while maintaining the parallel state with the lower board 14. .

Reference numeral 22 denotes a measuring mechanism, and the measuring mechanism 22
Is a sensor housing lower portion 24 rotatably provided on the elevating board 18 and provided with a gear 23 on the outer periphery, a sensor housing upper portion 25 rotatably connected above the sensor housing lower portion 24, and the sensor housing upper portion. Two
5 and a sensor main body 26 which is vertically inserted through the lower part of the sensor housing 24.

As shown in FIG. 4, the sensor main body 26 has a hollow cylindrical shape and has a linear gauge inserted in the axial center thereof.
A borematic 27 is provided at an upper end portion protruding above the sensor housing upper portion 25.

This boamatic 27 has, around its periphery, angular holes 28 arranged at three positions in the circumferential direction at equal intervals and penetrating in the radial direction.
It has individual measurement sensors 29.

The sensor body 26 is provided so as to surround the borematic 27 and passes through between the upper substrates 16 so as to come into contact with the lower end surface of the vertical drain pipe 5 to be measured. Having a positioning member 30
It has a sensor guide 31 at the lower end.

Further, the sensor body 26 has the sensor housing upper portion 25 on the outer periphery of the linear gauge.
The sensor main body 26 is provided with a compression spring 32 whose lower end is supported and which can push up the sensor main body 26 upward, and the repulsive force of the compression spring 32 constantly urges the sensor main body 26 upward. Sensor guide 31 provided at the lower end
Is held at a position where it comes into contact with the lower surface of the lower part 24 of the sensor housing.

Reference numeral 33 is a ball spline, and the ball spline 33 is rotatably provided on the elevating board 18 near the sensor body 26 and is arranged so as to mesh with the gear 23 of the lower part 24 of the sensor housing. The small gear 34 penetrates vertically, is rotatably supported by the lower substrate 14 and the upper substrate 16, and a worm wheel 35 is externally fitted and fixed to the upper end portion.

A worm 36 that meshes with the worm wheel 35 is provided on the upper surface of the upper substrate 16, and the worm 3
By connecting a flexible shaft 37 to 6 and applying human power to the end of the flexible shaft 37, the sensor body 26 is swung through the worm 36 and the worm wheel 35, the ball spline 33, the pinion gear 34 and the gear 23. Form to get.

Reference numeral 38 denotes a ball screw, and the ball screw 3
8 is the rear side of the dolly 11 of the elevating board 18 (B in FIG. 1).
The ball nut 39 disposed and fixed on the side) is vertically screwed and penetrated, is rotatably supported by the lower substrate 14 and the upper substrate 16, and the worm wheel 40 is externally fitted and fixed to the upper end portion. There is.

A worm 41 that meshes with the worm wheel 40 is provided on the upper surface of the upper substrate 16, and the worm 4
The flexible shaft 42 is connected to the flexible shaft 42, the human power is applied to the end portion of the flexible shaft 42, and the ball screw 38 is rotated through the worm 41 and the worm wheel 40. It is formed so that it can be raised and lowered.

The sensor body 2 of the upper substrate 16
Four support shafts 43 vertically extending at predetermined intervals in the width direction and the longitudinal direction of the upper substrate 16 are provided upright at a position surrounding the upper substrate 16, and the upper substrate is supported by the tip end portion of the support shaft 43. It is fixed so as to be substantially parallel to 16,
The upper substrate 16 is arranged in parallel with each other with a space adapted to the outer diameter of the vertical drain pipe 5 to be measured in the width direction of the upper substrate 16.
The guide members 44, 44 extending in the longitudinal direction are provided, and the inner edges of the respective guide members 44, 44 on the tip end side (A side in FIG. 2) facing each other are formed so as to be spaced apart as they approach the tip end.

Further, a stopper member 45 having an inner edge with an opening degree of about 90 ° toward the tip end side of the guide member 44.
Is provided on the upper surfaces of the guide members 44, 44, and the carriage 11 is pushed along the support beam 9 just below the lower mirror portion 3 of the reactor pressure vessel 1 to detect the axial center of the sensor body 26 and the vertical drain pipe 5 to be measured. The stopper member 45 is attached to the guide member 44, so that the inner edge of the stopper member 45 abuts on the outer circumference of the vertical drain pipe 5 to be measured when the pipe axis is aligned.
Fix at 44.

Reference numeral 47 is a handle for pushing the carriage 11.

The operation of the drain pipe inner diameter measuring device shown in FIGS. 1 to 4 will be described below.

After the vertical drain pipe 5 of the drain pipe 2 is cut, when measuring the inner diameter of the cut end of the vertical drain pipe 5, it extends toward substantially the center of the lower mirror portion 3 of the reactor pressure vessel 1. When the dolly 11 is mounted on the support beam 9 so that the cam followers 20 are in contact with the upper surface of the support beam 9 and the guide angles 21 are along both side surfaces of the support beam 9, and the dolly 11 is pushed directly below the lower mirror section 3, The guide members 44, 44 provided on the upper part of the carriage 11 advance across the vertical drain pipe 5 to be measured, and guide the carriage 11 directly below the vertical drain pipe 5.

At this time, the axis of the vertical drain pipe 5 and the carriage 1
If there is a difference from the center of the vertical drain pipe 1, the guide members 44, 44 contacting the outer peripheral surface of the vertical drain pipe 5 receive a reaction force from the vertical drain pipe 5, and this reaction force is applied to the carriage 11 in the width direction. The lower base plate 14 slides on the miniature LM guide 13 provided on the carriage main body 12 as a result of the movement of the lower base plate 14 to the side of the vertical drain pipe 5. It moves so as to follow the tube axis, and is corrected so that the tube axis of the vertical drain pipe 5 and the axis of the sensor body 26 substantially coincide with each other.

When the carriage 11 stops moving when the inner edge of the stopper member 45 comes into contact with the outer peripheral surface of the vertical drain tube 5, the tube axis of the vertical drain tube 5 and the axis of the sensor body 26 substantially coincide with each other. To do.

A manual force is applied to the end portion of the flexible shaft 37 to rotate the ball spline 33 via the worm 36 and the worm wheel 35, so that the sensor housing lower portion 24 via the small gear 34 and the gear 23.
The sensor guide 3 which is pressed against the lower surface of the lower part 24 of the sensor housing by the repulsive force of the compression spring 32.
The sensor body 26 is rotated through 1 so as to face the required direction.

Next, a human power is applied to the end of the flexible shaft 42 to apply the worm 41 and the worm wheel 40.
By rotating the ball screw 38 via the ball nut 39, the elevating board 18 is raised via the ball nut 39.

When the elevating board 18 is raised and the measuring mechanism 22 provided on the elevating board 18 is pushed up, the upper end of the sensor body 26 provided on the upper part 25 of the sensor housing of the measuring mechanism 22 via the compression spring 32. Part of the borematic 27 is inserted into the lower end of the vertical drain pipe 5 to be measured, and the positioning member 30 of the sensor body 26 stops at the position where it abuts the lower end surface of the vertical drain pipe 5.

After that, the compression spring 32 is only compressed even when the elevating board 18 is raised, the sensor body 26 is not pushed up, and the borematic 27 remains in the pipe at the lower end of the vertical drain pipe 5.

Therefore, the measuring sensor 29 is activated to measure the inner diameter of the vertical drain pipe 5.

In the apparatus for measuring the inner diameter of the drain pipe shown in FIGS. 1 to 4, the carriage 11 travels along the support beam 9 and can approach to just below the center of the lower mirror section 3 of the reactor pressure vessel 1. Since the sensor main body 26 having the measurement sensor 29 capable of measuring the inner diameter of the vertical drain pipe 5 is mounted so as to be vertically movable, the work of measuring the inner diameter of the vertical drain pipe 5 of the drain pipe 2 can be easily performed.

FIG. 5 shows another example of the embodiment of the drain pipe inner diameter measuring device of the present invention. In the figure, the parts designated by the same reference numerals as those in FIGS. 1 to 4 represent the same parts. There is.

In the drain pipe inner diameter measuring device shown in FIG.
The carriage 11 is configured to travel along the reference rail 46 that is superposed on the upper surface of the support beam 9, and this drain pipe inner diameter measuring device is similar to that shown in FIGS. 1 to 4 described above. It produces a working effect.

The drain pipe inner diameter measuring device of the present invention is not limited to the above-described embodiment, and it goes without saying that various modifications can be made without departing from the scope of the present invention.

[0046]

As described above, in the apparatus for measuring the inner diameter of the drain pipe of the present invention, the measuring mechanism is mounted on the trolley that can be approached just below substantially the center of the lower end plate of the reactor pressure vessel. It is possible to obtain an excellent effect that the inner diameter measurement work for the drain pipe communicating with the lower mirror portion of the reactor pressure vessel can be easily performed.

[Brief description of drawings]

FIG. 1 is a side view showing an example of an embodiment of a drain pipe inner diameter measuring device of the present invention.

FIG. 2 is a view taken in the direction of arrows II-II in FIG.

FIG. 3 is a view taken in the direction of arrows III-III in FIG. 1;

FIG. 4 is a partially cutaway side view of the measuring mechanism related to FIG.

FIG. 5 is a side view showing another example of the embodiment of the drain pipe inner diameter measuring device of the present invention.

FIG. 6 is a partially cutaway perspective view of a lower end portion of an example of a conventional reactor pressure vessel.

7 is a cross-sectional view of the lower end portion related to FIG.

[Explanation of symbols]

 1 Reactor Pressure Vessel 3 Lower Mirror 5 Vertical Drain Tube (Tube) 9 Support Beam 11 Bogie 22 Measuring Mechanism 38 Ball Screw (Elevating Mechanism) 44 Guide Member 46 Reference Rail

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Tetsuo Sugano 1 Shin-Nakahara-cho, Isogo-ku, Yokohama-shi, Kanagawa Ishi Kawashima Harima Heavy Industries Co., Ltd. Yokohama Engineering Center (72) Inventor Nobuyuki Nakazawa Toyosu, Koto-ku, Tokyo No. 1-15 Ishikawajima Harima Heavy Industries Co., Ltd. Technical Research Institute (72) Inventor Masashi Togasaki 1 Shin-Nakahara-cho, Isogo-ku, Yokohama, Kanagawa Ishi Kawashima Harima Heavy Industries Co., Ltd. Yokohama Engineering Center

Claims (2)

[Claims] 1. Traveling along a support beam arranged below the reactor pressure vessel so as to extend from the outside of the lower space of the reactor pressure vessel to just below the center of the lower mirror of the reactor pressure vessel. A trolley, a measuring mechanism that is supported by the trolley so as to be able to move up and down, and that can measure the inner diameter of the pipe, and a guide member that is provided on the trolley and that can contact the pipe whose inner diameter is to be measured.
A drain pipe inner diameter measuring device, comprising: an elevating mechanism provided on the trolley and capable of moving the measuring mechanism close to and away from the pipe to be measured. 2. A reference rail arranged below the reactor pressure vessel so as to extend from the outside of the lower space of the reactor pressure vessel to just below substantially the center of the lower mirror portion of the reactor pressure vessel, and the reference rail. A trolley that travels along the trolley, a measurement mechanism that is supported by the trolley so as to be able to move up and down, and that can measure the inner diameter of the pipe; A drain pipe inner diameter measuring device, comprising: an elevating mechanism which is provided on the trolley and can move the measuring mechanism close to and away from the pipe to be measured.