JP2001347373A - Submerged welding equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a submerged welding equipment equipped with a function performing the submerged welding of the block of a storing rack in order to perform a repair and/or remodeling. SOLUTION: In the equipment, after guiding a new supporting member C under water while holding the supporting member C which is welded and fixed to a bracket A in the water and pushing the new supporting member C to the bracket A in a prescribed position, by draining the water in a dry type box 6 and a local box 10 to make the insides of the dry type box 6 and the local box 10 the same state as the atmosphere, welding by a TIG welding equipment 41 is enabled, and hence the bringing of the new supporting member C into the water in an atmosphere where a person can not enter and welding working for mounting the new supporting member C, can be performed with a remote control. As a result, the submerged welding equipment equipped with the function performing the submerged welding of the block of the storing rack to perform the repair and/or the remodeling, is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an underwater welding apparatus, and more particularly, to an underwater welding apparatus suitable for welding a new welding member to an existing underwater member.

[0002]

2. Description of the Related Art In some cases, a new member is attached to a structure provided underwater, or an old member is removed and replaced with a new member. For example, a spent fuel storage pit as an underwater structure of a nuclear power plant is a facility for storing a fuel assembly (spent fuel) that has been burned in a nuclear reactor in a predetermined manner. A storage rack for receiving and supporting the fuel is provided submerged in shielding and cooling water.

[0003] In recent years, there has been an increasing need to increase the amount of spent fuel stored in a power plant, and there has been a need to repair and remodel existing storage racks. Since storage racks already receive and store a large amount of spent fuel, it is necessary to prepare equipment for carrying out all the stored fuel to another spent fuel storage pit during renovation and renovation work. It is impractical due to the huge cost and number of days. Therefore, several blocks of storage racks are arranged in the spent fuel storage pit underwater, and one block of stored fuel is moved to another block to perform renovation / remodeling work.

[0004]

When the existing storage rack is repaired or remodeled, the work must be performed in a state where the spent fuel is present in the spent fuel storage pit. It is necessary not to deteriorate the water quality. In addition, the storage rack block is supported by a welded structure from the side wall of the spent fuel storage pit because of its earthquake-resistant structure.To repair or remodel, the storage rack support material is cut underwater and the storage rack is cut off. After removing the block, the new storage rack block is welded underwater to the old support bracket.

[0005] As a method for welding a block of a new storage rack, TIG welding that does not generate spatter or slag is suitable, and it is necessary to have a function of performing the surroundings of a welded portion under water in the same atmosphere as the atmosphere. In addition, since the block of the new storage rack has a shape to be welded against the old support material, a welding torch for simultaneous welding of two electrodes is required because welding joints are provided above and below.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an underwater welding apparatus having a function of performing underwater welding of a block of a storage rack in order to perform repair and remodeling.

[0007]

An underwater welding apparatus according to the present invention for achieving the above object is an underwater welding apparatus for welding a welding member to a projecting member projecting from a wall surface, wherein a box body is movably positioned. A local box having an opening communicating with the protruding member inside the box main body, a supporting device for supporting the welding member in the local box is provided on the box main body, and the opening is provided on the box main body. A first seal member for sealing the top and bottom of the opening and the protruding member in a state where the welding member is positioned by fitting the first member to the local box, and in this state, a first seal member for sealing the side portion of the opening and the protruding member. (2) The seal member is provided in the local box, and a welding device for welding the welding member to the protruding member is provided over the box body and the local box.

In the welding apparatus, the torch is disposed in the local box, a moving mechanism for positioning and moving the main body and the torch to arbitrary positions is disposed in the box main body, and the torch monitors the welding condition. A monitor means is provided. The first sealing member has a tube provided along the fitting surface, and seals the fitting surface by introducing a fluid into the tube. Further, the second seal member has a planar seal portion with respect to a side portion of the opening, and the planar seal portion is supported by the local box so as to be freely opened and closed.
Further, the local box is provided so as to be offset with respect to the center of the box body.

[0009]

FIG. 1 is a partially cutaway perspective view showing the entire configuration of an underwater welding apparatus according to an embodiment of the present invention.
3 is a front view of the underwater welding apparatus, FIG. 3 is a plan view of the underwater welding apparatus, FIG. 4 is a side view of the underwater welding apparatus, and FIG.
6 and 7 show a partially broken perspective view of the seal portion of the local seal box, FIGS. 8 to 10 show the operation of the underwater welding device, and FIG. 11 shows the old support material and the new support material. 2 shows a perspective view of the wall surface of the storage pit in which is attached.

As shown in FIG. 11, the underwater welding apparatus according to the present embodiment cuts an angle-shaped old support material B supporting an existing rack from the wall D side of the storage pit 1 at a depth of 8 m to 10 m. U-shaped bracket (protruding member) A holding old support B after removing the existing rack
, A new support member (welding member) C for fitting with a new rack is attached by welding under water. Hereinafter, the configuration of the underwater welding device will be described with reference to FIGS.

As shown in FIGS. 1 to 4, a support frame 4 is supported by a manipulator E via a left-right adjustment slide 2 and a front-rear adjustment slide 3.
Is movable to an arbitrary position in a horizontal plane. A dry box 6 as a box body is supported by the support frame 4 via a front and rear support mechanism 5 so as to be movable back and forth. As shown in FIGS. 3 and 4, the main body of the front and rear cylinders 7 is fixed to the dry box 6, and the tip of the drive rod 8 of the front and rear cylinders 7 is fixed to the support frame 4. That is,
When the drive rod 8 is extended by driving the front and rear cylinders 7, the dry box 6 separates from the wall D with respect to the support frame 4,
When the drive rod 8 contracts, the dry box 6 moves toward the wall D with respect to the support frame 4.

An opening 9 is formed in the front surface (the surface facing the wall surface D) of the dry box 6, and a local box 10 corresponding to the new support member C is provided in the opening 9 in the box seal packing 1.
Attached via 1. An opening 11 to be fitted to the U-shaped bracket A is provided at the tip of the local box 10. The opening 11 has a step shape on the front surface of the bracket A and a surface fitting on the upper and lower surfaces of the bracket A (a in FIG. 6).
Part) (two parts on the left and right). The provision of the local box 10 makes it possible to move the new support member C and the welding torch toward the bracket A as described later, even if the bracket A exists in a narrow portion.

As shown in FIGS. 6 and 7, seal packings 12 arranged in a U-shape (horseshoe shape) are provided on the upper and lower surfaces of the opening 11, and the seal packing 12 supplies air to the air tube 13. By doing so, it is pressed against the upper and lower surfaces of the bracket A, and the opening 11 and the upper and lower surfaces of the bracket A are sealed (first sealing member).

A side packing 14 is provided at a portion of the opening 11 which fits into a step shape (a portion in FIG. 6: a fillet welded portion where a weld bead exists).
Is deformed in accordance with the stepped shape of the bracket A, and the side packing 14 is pressed by a seal plate 15 (see FIG. 7; details will be described later) as a planar seal portion, and
The first side surface and a part of the front and side surfaces of the bracket A are sealed regardless of the shape of the weld bead (second seal member).

As shown in FIG. 1 and FIG.
Is connected to the local box 10 via a shaft 16 extending in the vertical direction.
, And a seal cylinder 17 is provided on the opposite side with respect to the shaft 16. Seal cylinder 17
, The seal plate 15 is opened and closed, and the planar seal portion is supported by the local box 10 so as to be openable and closable.

As shown mainly in FIG. 1 to FIG.
On the side, located around the local box 10, supporting leg mechanisms 18 for positioning and fixing are provided on both left and right sides and up and down,
The upper support leg mechanism 18 is provided with a screw-adjustable landing foot 19 that lands on the upper surface of the U-shaped bracket A.
Further, the upper support leg mechanism 18 is provided with a detachment reaction force prevention mechanism 20 including an L-shaped fitting 20a inserted between the old angled support member B and the wall surface D.

On the other hand, the lower support leg mechanism 18 is provided with a hydraulic clamp cylinder 21 which is pressed against the lower surface of the U-shaped bracket A and sandwiches the bracket A. Bracket A with landing foot 19 and clamp cylinder 21
The support frame 4 that supports the dry box 6 (local box 10) is positioned and fixed to the bracket A by sandwiching. Further, upper and lower support leg mechanisms 1
8 is provided with four hit gauges 22 for positioning the entire device using the wall surface D, and six suction cups 23 for fixing the device to the wall surface D are provided. They are fixed at right angles.

As shown mainly in FIGS. 2 to 4, the support leg mechanism 18 is provided with a left / right position camera 31 and a landing detector 33, and a wall surface detector 34 is arranged at four points. ing. A landing confirmation camera 32 is provided on the support frame 4.
(See FIG. 3). In the landing detector 33,
The electric signal at the time of landing is displayed on the control panel on the ground side. In the wall detector 34, an electric signal is displayed on the ground-side control panel so that the wall D and the device are positioned in parallel.

The manipulator E is operated while comparing the electric signal values of the landing confirmation camera 32 and the landing detector 33. The left / right position camera 31 pushes the dry box 6 toward the bracket A to check the positioning between the side surface of the local box 10 and the end surface of the bracket A. When the left / right position camera 31 determines that the adjustment is necessary, Then, the landing foot 19 is once lifted and the adjustment is performed with the left and right adjustment slide 2.
The front / rear adjustment slide 3 is finely moved until the contact gauge 22 of the support leg mechanism 18 is pressed against the wall D, and the manipulator is operated so that the electric signal display of the wall detectors 34 arranged at the four positions becomes an appropriate value. The parallel position is determined by the rotation axis of E. After the positioning is completed, final fixing is performed by the clamp cylinder 21.

Therefore, a single hanging camera from the ground for guiding and positioning the apparatus may be used for overall monitoring, and a left / right position camera 31, a landing confirmation camera 32, a landing detector 33, and a wall detector 34 on the apparatus side. By adjusting the left and right adjustment slides 2 and the front and rear adjustment slides 3 by displaying the information described above, high-precision positioning becomes possible, the positioning of the apparatus can be performed in a short time with a small number of personnel, and the work efficiency is improved. be able to.

As shown in FIGS. 1 and 5, a slide rail 24 is provided in the center of the dry box 6 in the vertical direction.
The holding guide member 25 located in the position 0 is movably supported, and the holding guide member 25 is reciprocated by a cylinder (not shown). A new support member C is provided at the tip of the holding guide member 25.
And a holding portion 26 for holding the rear end portion therebetween. A pressing cylinder 27 is provided above the holding unit 26, and the rear end of the new support member C is held by the pressing cylinder 27 so as to be rotatable by the holding unit 26. The new support member C is urged toward the front side (the wall surface D side) by four spring members 29 having built-in pressing pistons 28 at the four positions with respect to the holding portion 26, and is pressed when the new support member C is pressed against the bracket A. The cylinder 27 is automatically rotated about the support point of the cylinder 27 so that surface contact can be made (close contact can be made).

As shown in FIGS. 1 and 5, on a ceiling surface and a bottom surface of the dry box 6, a TIG automatic welding device 41 as a welding device is attached in a downward and upward posture, respectively. The reason why two TIG automatic welding devices 41 are provided is to weld the upper and lower edges of the new supporting member C at the same time. Two TIG
Since the configuration of the automatic welding device 41 is the same, only one side will be described.

A long torch 42 as a torch portion of the TIG automatic welding device 41 is arranged in the local box 10. The TIG automatic welding device 41 includes a traveling electric slide 43 for moving the long torch 42 in a direction along the welding line (a direction perpendicular to the plane of the paper in FIG. 5) and the long torch 42 in the width direction of the welding groove ( A front / rear electric slide 44 for moving the torch 42 in the vertical direction (vertical direction in FIG. 5) of the long torch 42 for moving the torch 42 in the vertical direction (in FIG. 5).
The long torch 42 is supported by a wire position adjusting electric slide 46. The long torch 42 is connected to a feeder 48 of a wire supply device 47 by a guide tube 49.

A camera case 52 having a built-in CCD camera is mounted on the body of the long torch 42 as a monitoring means via a bending lens barrel 51 using a prism, and the situation near the welding arc position is photographed by the CCD camera. Is done. The TIG automatic welding device 41 is remotely operated while observing the situation near the welding arc position on a welding monitor TV (not shown). In the drawing, reference numeral 59 denotes a wire nozzle.

Although a detailed description has been omitted, the electric equipment, the camera case 52, and the like have a watertight structure in which a seal packing is provided on an opening / closing lid, and water is supplied by supplying purge air to the power cable and the coaxial line. Has been prevented.

As shown in FIGS. 1 and 4, the dry box 6 is provided with a water supply / drainage pipe 53 and an exhaust pipe 54, and the inside of the dry box 6 (the inside of the local box 10) is grounded into an underwater atmosphere and an aerial atmosphere. The air pressure inside the dry box 6 (inside the local box 10) is set higher than the outside water pressure to prevent water from entering the inside.

Further, as shown in FIG.
0 is provided such that the center x is offset by Δx with respect to the center X of the dry box 6. By offsetting the center x of the local box 10 with respect to the center X of the dry box 6, the new support member C can be welded to a portion closer to the corner (left side in FIG. 3). By preparing a device in which the offset direction is reversed, it becomes possible to weld the new support member C to a portion closer to the opposite corner (the right side in FIG. 3).

The operation of the underwater welding apparatus having the above configuration will be described with reference to FIGS. 8 shows the positioning and fixing operation of the underwater welding device, FIG. 9 shows the sealing operation of the dry box 6, and FIG. 10 shows the welding operation.

As shown in FIG. 8 (a), the underwater welding apparatus uses a manipulator E to perform welding on the member to be welded (old support member B).
Will be guided to. At this time, the manipulator E is operated by suspending several underwater cameras from the ground and observing them from various directions.

As shown in FIG. 8 (b), the upper support leg mechanism 18 lands on the upper surface of the U-shaped bracket A, and the wall D
Sucks the suction cup 23. And the lower support leg mechanism 1
The support frame 4 is positioned and fixed by pressing the lower surface of the bracket A with the clamp cylinder 21 of FIG. Further, the L-shaped bracket 20a of the detachment reaction force prevention mechanism 20 is inserted between the angled old member B and the wall surface D. Since the torch portion of the TIG automatic welding device 41 is disposed in the local box 10, the local box 10 can be brought closer to the U-shaped bracket A even if the obstacle F exists.

As shown in FIG. 8 (c), after fixing the support frame 4, the drive rod 8 of the front and rear cylinders 7 is contracted to advance the dry box 6 toward the wall D until the local box 10 hits the bracket A. Let it. In this state, sealing is performed and welding is performed.

As shown in FIG. 9A, the dry box 6
The water is filled in the (local box 10), and when the local box 10 is in contact with the bracket A, the side packing 14 is pushed into the stepped shape of the bracket A (front stepped portion). Hit. Side packing 1
4 is pressed against the step shape (front step portion) of the bracket A, so that the front step portion is securely sealed regardless of the shape of the weld bead.

As shown in FIG. 9B, the local box 10
The seal packing 12 arranged in a horseshoe shape fits on the upper and lower surfaces of the bracket A. In this state, air is supplied to the air tube 13 so that the seal packing 12
Is pressed against the upper and lower surfaces of the bracket A, and the opening 11 and the upper and lower surfaces of the bracket A are sealed. At the same time, the sealing plate 17 is driven to close the sealing plate 15, and the side surface of the opening 11 and a part of the front surface and the side surface of the bracket A are sealed by the sealing plate 15. With the opening 11 and the bracket A sealed, the dry box 6
Drain the water in the (local box 10) and dry the box 6
The inside of the (local box 10) is set to an aerial atmosphere and set to a pressure higher than the external water pressure.

Thereafter, the holding guide member 25 is advanced along the slide rail 24, and the new supporting member C, which has been previously held by the holding portion 26 by the pressing cylinder 27, is
Press At this time, the new support member C is urged to the front side (the wall D side) by the spring members 29 having the built-in pressing pistons 28 at four places, so that when the new support member C is pressed against the bracket A, the new support member C is pressed. The cylinder 27 is automatically turned around the support point of the cylinder 27 and comes into surface contact. And the new support member C covered with the local box 10
To the bracket A.

As shown in FIG. 10A, the camera case 5
The long torch 42 of the upper and lower TIG automatic welding device 41 is guided and positioned at the welding position via the traveling electric slide 43, the front and rear electric slide 44, and the upper and lower electric slide 45, while monitoring with the CCD camera built in 2. In order to prevent deformation due to thermal strain, two-electrode simultaneous welding is remotely performed by the upper and lower TIG automatic welding devices 41.

As shown in FIG. 10 (b), after the welding is completed, water is supplied into the dry box 6 (local box 10) to release all the sealing mechanisms of the local box 10.
That is, the air is exhausted from the air tube 13 and the seal plate 15 is opened by driving the seal cylinder 17.
After releasing all the sealing mechanisms, the fixing of the new support member C by the pressing cylinder 27 is released, and the holding guide member 25 is retracted along the slide rail 24. Then, the drive rod 8 of the front and rear cylinder 7 is extended to move the dry box 6 (local box 10) backward.

In the above embodiment, the example in which the support frame 4 is connected to the manipulator E via the left and right adjustment slide 2 and the front and rear adjustment slide 3 has been described, but the support frame 4 is directly connected to the manipulator E. It is also possible to move the support frame 4 to a predetermined position by the operation of the manipulator E itself to position the apparatus. In addition, when the welding operation is performed, air is put into the dry box 6 (local box 10) to keep the atmosphere in the same state, but it is also possible to put an inert gas for TIG welding.

According to the underwater welding apparatus described above, the new support member C, which is welded and fixed to the bracket A underwater, is held and guided underwater, and the new support member C is fixed to the bracket A at a predetermined position.
After pressing, dry box 6 (local box 10)
The water inside the storage pit 1 is discharged to make it in the same state as the atmosphere, and the upper and lower TIG automatic welding devices 41 enable simultaneous welding of two electrodes. The welding work for mounting can be performed by remote control. For this reason, it is possible to provide an underwater welding apparatus having a function of performing underwater welding of a block of a storage rack in order to perform repair and remodeling.

[0039]

The underwater welding apparatus according to the present invention is an underwater welding apparatus for welding a welding member to a projecting member projecting from a wall surface. The underwater welding apparatus includes a box body movably positioned and communicates with the inside of the box body. A local box having an opening fitted to the member is provided in the box main body, and a support device for supporting the welding member in the local box is provided in the box main body,
A first seal member for sealing the top and bottom of the opening and the projecting member is provided in the local box in a state where the opening is fitted to the projecting member and the welding member is positioned, and in this state, the side portion of the opening and the projecting member are provided. A second sealing member for sealing the welding member is provided in the local box, and a welding device for welding the welding member to the projecting member is provided over the box body and the local box. After holding and guiding into the water and pressing the welding member against the protruding member at a predetermined position, the water in the box body and the local box is discharged to be in the same state as the atmosphere, thereby enabling welding with a welding device. Therefore, the welding operation for carrying in and mounting the welding member into the water in an environment where no one can enter can be performed by remote control. As a result, it is possible to provide an underwater welding apparatus having a function of performing underwater welding of a block of a storage rack in order to perform repair and remodeling.

In the welding apparatus, the torch portion is disposed in the local box, a moving mechanism for positioning and moving the main body portion and the torch portion to arbitrary positions is disposed in the box main body, and the torch portion monitors the welding status. Since the monitoring means is provided, the local box can be reduced to a minimum size. Further, the first seal member has a tube provided along the fitting surface, and the fitting surface is sealed by introducing a fluid into the tube. Character can be obtained. Further, the second seal member has a planar seal portion with respect to the side of the opening, and the planar seal is supported by the local box so as to be freely opened and closed. Regardless of the shape of the member, it is possible to reliably seal the side of the opening. Further, since the local box is provided offset with respect to the center of the box body, it is possible to weld a welding member even if it is a protruding member near the corner of the pit.

[Brief description of the drawings]

FIG. 1 is a partially broken perspective view showing the entire configuration of an underwater welding apparatus according to an embodiment of the present invention.

FIG. 2 is a front view of the underwater welding device.

FIG. 3 is a plan view of the underwater welding device.

FIG. 4 is a side view of the underwater welding device.

FIG. 5 is a view taken along line IV-IV in FIG. 4;

FIG. 6 is a partially cutaway perspective view of a seal portion of the local seal box.

FIG. 7 is a partially broken perspective view of a seal portion of the local seal box.

FIG. 8 is an operation explanatory view of the underwater welding device.

FIG. 9 is a diagram illustrating the operation of the underwater welding device.

FIG. 10 is an explanatory view of the operation of the underwater welding device.

FIG. 11 is a perspective view of a storage pit wall in a state where a new support member is attached to an old support member.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Storage pit 2 Left-right adjustment slide 3 Front-back adjustment slide 4 Support frame 5 Front-back support mechanism 6 Dry box 7 Front-back cylinder 8 Drive rod 9 Opening 10 Local box 11 Opening 12 Seal packing 13 Air tube 14 Side packing 15 Seal plate 16 Shaft 17 Seal cylinder 18 Support leg mechanism 19 Landing foot 20 Separation reaction force prevention mechanism 21 Clamp cylinder 22 Gauge 23 Suction cup 24 Slide rail 25 Holding guide member 26 Holding section 27 Pressing cylinder 28 Pressing piston 29 Spring member 31 Left / right position camera 32 Landing confirmation camera 33 Landing detector 41 TIG welding device 42 Long torch 43 Traveling electric slide 44 Front and rear electric slide 45 Vertical electric slide 46 Wire position adjusting electric slide 47 Wire feeding device 48 Feeding feeder 49 Guide tube 51 Bending lens barrel 52 Camera case 53 Piping for water supply and drainage 54 Piping for exhaust 59 Wire nozzle

Continued on the front page (72) Inventor Hiroshi Tanaka 1-1-1 Wadazakicho, Hyogo-ku, Hyogo-ku, Kobe-shi, Hyogo Mitsubishi Heavy Industries, Ltd. 1-1-1 1-1 Inside Kobe Shipyard, Mitsubishi Heavy Industries, Ltd. (72) Inventor Hiromasa Kamei 2-19-19 Shinhama, Arai-machi, Takasago, Hyogo Prefecture Inside Takaishi Engineering Co., Ltd. 2-18-19 Shinhama Takahashi Engineering Co., Ltd. (72) Inventor Haruna Bunsaku 2-8-19 Shinhama, Arai-machi, Takasago-shi, Hyogo F-term in Takahashi Engineering Co., Ltd. 4E001 AA03 BB07 DB01 DD01 DF08 4E081 YS10

Claims (5)

[Claims] 1. An underwater welding apparatus for welding a welding member to a projecting member projecting from a wall surface, comprising: a box body movably positioned; A local box having a local box is provided in the box main body, a supporting device for supporting the welding member in the local box is provided in the box main body, and the upper and lower portions of the opening and the projecting member are positioned in a state where the opening is fitted to the projecting member and the welding member is positioned. And a second seal member for sealing the side portion of the opening and the protruding member is provided on the local box, and a welding member is welded to the protruding member. An underwater welding device, wherein the welding device is provided over a box body and a local box. 2. The welding device according to claim 1, wherein the torch portion is disposed in the local box, and a moving mechanism for positioning and moving the main body portion and the torch portion to arbitrary positions is disposed on the box main body. An underwater welding apparatus comprising monitoring means for monitoring a welding situation. 3. The first sealing member according to claim 1, wherein the first sealing member has a tube provided along the fitting surface, and seals the fitting surface by introducing a fluid into the tube. Underwater welding equipment characterized by the following. 4. The second seal member according to claim 1, wherein the second seal member has a planar seal portion with respect to a side portion of the opening, and the planar seal portion can be opened and closed locally. An underwater welding device supported by a box. 5. The underwater welding apparatus according to claim 1, wherein the local box is provided offset from a center of the box body.