JP2023030347A - Valve attachment device - Google Patents

Abstract

To provide a means which enables a fluid in a fluid pipe to be discharged easily without leaking the fluid to the outside and enables change of the route and adjustment of the flow rate of water discharged etc.SOLUTION: A valve attachment device 3 is provided on a fluid pipe 1. A casing 10 is fixed to the fluid pipe 1 by a clamp 20 of the valve attachment device 3. A contact surface 13 of the casing 10 is placed in contact with an outer peripheral surface of the fluid pipe 1. A boring tool 30 in the casing 10 is protruded from the casing 10 through an opening 15 in the contact surface 13 to form a hole 1c in the fluid pipe 1. The fluid in the fluid pipe 1 flows into second fluid pipes 2 through a connector 51 with a valve 52 provided at the casing 10.SELECTED DRAWING: Figure 7

Description

TECHNICAL FIELD The present invention relates to a device for attaching a valve to a fluid pipe, and in particular, it is used for changing the piping route of a fluid pipe for flowing fluid such as radioactively contaminated water whose external leakage is strictly regulated, or for cutting and removing the fluid pipe after releasing the internal pressure. It relates to a valve mounting device suitable for

For example, at the Fukushima Daiichi Nuclear Power Station, fluid pipes for transporting radioactively contaminated water are laid over tens of kilometers. As the decommissioning work progresses, fluid pipes are cut and removed, or the route (distribution route) is changed. When cutting, etc., it is necessary to discharge the high-pressure contaminated water in the pipe without spilling it on the floor or ground. At present, the area to be cut in the fluid pipe is surrounded by multiple layers of leakage prevention covers, and a temporary drainage system is installed to perform the cutting work.
Patent Literature 1 describes cutting a tube after crushing it to block it.

JP 2020-076604 A

The work of putting the leakage prevention cover on is complicated and takes time. In addition, once water begins to flow from the cut portion of the fluid pipe, it is difficult to adjust the flow rate of the water. There is
SUMMARY OF THE INVENTION In view of the above circumstances, it is an object of the present invention to provide a means for easily discharging, changing the route, adjusting the flow rate of water, etc., without causing the fluid in the fluid pipe to leak to the outside.

In order to solve the above problems, the inventor conducted extensive research and consideration, and as a result, installed a valve at a predetermined or arbitrary location in the fluid pipe to discharge the fluid in the fluid pipe, change the route, adjust the water flow rate, etc. I came up with the idea. The present invention has been made based on the above idea, and provides a device for attaching a valve to a fluid pipe, comprising:
a casing having an abutment surface that forms a partially cylindrical concave surface that matches the outer peripheral surface of the fluid pipe, and an inner chamber that reaches the abutment surface to form an opening;
one or more connectors having the valve and provided on the casing;
a clamp for fixing the casing to the fluid pipe such that the contact surface is applied to the outer peripheral surface of the fluid pipe;
a drilling tool that is housed and held in the casing, has a tip drilling tool that can be retracted from the opening, and has a connecting end on the opposite side of the drilling tool that is connected to a drive means;
characterized by comprising

By driving the drilling tool, a hole is made in the fluid pipe, and the fluid pipe and the inside of the casing are communicated through the hole.
Preferably, a second fluid line, such as a drain line, is connected to the valve. By manipulating the valve, the fluid in the fluid conduit can be discharged, rerouted, or flow adjusted through the casing and the second fluid conduit. It is also possible to interrupt the operation of discharging the fluid in the fluid pipe by closing the valve in the middle of the discharging process. After that, the valve can be opened and the discharge operation can be resumed.

The clamp has a drilling-side clamping body fixed to the casing, a receiving-side clamping body that clamps the fluid pipe between the drilling-side clamping body, and bolts and nuts that connect these clamping bodies together. , the bolt or the nut is preferably fixed to one of the clamps.
The tightening operation of the bolt and nut allows the clamp and thus the valve mounting device to be attached to the fluid line. By welding the bolt, there is no risk that the bolt will fall off the clamp before the nut is fitted, and there is no need to stop the bolt when tightening the nut. Therefore, the mounting work of the valve mounting device can be simplified, and the construction time can be greatly shortened. Therefore, when it is applied to the decommissioning work of a nuclear power plant, etc., the exposure dose of workers can be reduced.

It is preferable that the contact surface is provided with an annular contact-side sealing member surrounding the opening, and the contact-side sealing member includes a cushion packing compressible in a thickness direction.
The contact-side sealing member can prevent the fluid coming out of the hole from leaking out from between the outer peripheral surface of the fluid pipe and the valve mounting device.
By using the cushion packing as the contact-side sealing member, it is possible to reliably seal between the outer peripheral surface of the fluid pipe and the valve mounting device without strictly controlling the amount of tightening of the bolt and nut.

It is preferable that the inner peripheral surface of the casing on the opposite side of the opening from the at least one connector is provided with an annular internal seal member that is in close contact with the drilling tool.
The internal sealing member can seal between the inner peripheral surface of the casing and the drilling tool and prevent fluid from leaking out between the inner peripheral surface of the casing and the drilling tool.
At least one connector includes the connector closest to the opening along the axis of the casing.

The casing includes a cylindrical first casing portion including the abutment surface and at least one connector, and a first casing portion disposed on the side opposite to the opening of the first casing portion and detachably connected to the first casing portion. and a tubular second casing portion,
The drilling tool can be pulled out from the first casing part toward the second casing part, and the second casing is provided with a holding part that holds the drilling tool so as to allow driving. is preferred.
The drilling tool and the second casing part can be reused for mounting the valve at other locations, and cost can be reduced.

It is preferable that an intermediate valve is provided between the first casing part and the second casing part that allows the penetration of the drilling tool in an open state and that can be closed when the drilling tool is pulled out. .
By pulling out the drilling tool after the preceding and closing the intermediate valve, fluid leakage can be prevented more reliably.

A lid is preferably attachable to the head end of the casing opposite the opening. The lid can more reliably prevent fluid leakage.
The drilling tool may be withdrawable from the head end, and the lid may be attached to the head end after withdrawal.
The connecting end of the drilling tool protrudes from a head end opposite to the opening in the casing and is detachably connected to the driving means, and the driving means is separated from the head end. Further, a lid including a housing tube portion for housing the connection end may be attachable. In this case, the head end can be capped while the drilling tool remains in the casing.
Alternatively, a lid can be attached to an intermediate portion of the casing closer to the head end side than the at least one connector, and is separated from a portion closer to the head end side than the intermediate portion and the drilling tool. good too.
The portion closer to the head end than the intermediate portion and the drilling tool can be reused for mounting the valve at other locations, thereby reducing costs.

According to the present invention, it is possible to easily discharge, change the route, adjust the water flow rate, etc., without causing the fluid in the fluid pipe to leak to the outside.

FIG. 1 is a side view showing a state in which a valve mounting device according to a first embodiment of the present invention is installed in a fluid pipe. FIG. 2 is a front cross-sectional view along line II-II of FIG. 3 is a plan view along line III-III of FIG. 2. FIG. 4 is a bottom view of the casing, drilling tool and drilling-side clamp of the valve mounting device along line IV-IV of FIG. 2; FIG. 5 is an enlarged cross-sectional view of the circular portion V of FIG. 2. FIG. FIG. 6(a) is a cross-sectional view showing the contact-side sealing member of the clamp before use. FIG. 6(b) is a cross-sectional view showing the contact-side seal member in use. FIG. 7 is a front cross-sectional view showing a state in which the fluid pipe is perforated. FIG. 8 is a front cross-sectional view showing the valve mounting device with the drilling tool pulled out and the lid closed. FIG. 9 is a front cross-sectional view showing the valve mounting device with the drilling tool left and the lid closed. FIG. 10 is a front cross-sectional view showing the valve mounting device with the second casing part and the drilling tool removed and the first casing part covered. FIG. 11 is a side view showing a state in which valve mounting devices are provided at a plurality of locations on the fluid pipe. FIG. 12 is a front cross-sectional view showing a state in which the valve mounting device according to the second embodiment of the present invention is installed in a fluid pipe. FIG. 13 is a front cross-sectional view showing the valve mounting device of the second embodiment with the drilling tool removed and the lid closed. FIG. 14 is a front cross-sectional view showing the valve mounting device of the second embodiment with the second casing portion and the drilling tool removed and the intermediate valve covered.

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings.
<First Embodiment (FIGS. 1 to 11)>
As shown in FIG. 1, for example, in a nuclear power plant undergoing decommissioning work, fluid pipes 1 for transporting radioactively contaminated water (fluid) are laid over tens of kilometers. The material of the fluid tube 1 is not particularly limited, and may be resin or metal.
In order to cut and remove the fluid pipe 1 or change the route (distribution route) according to the progress of the decommissioning work, a valve mounting device 3 is attached to a predetermined or arbitrary position of the fluid pipe 1. there is

As shown in FIG. 2 , the valve mounting device 3 comprises a casing 10 , a clamp 20 and a drilling tool 30 .
The casing 10 is formed in a tubular shape perpendicular to the fluid pipe 1 . Specifically, as shown in FIG. 2 , the casing 10 includes a first casing portion 11 closer to the fluid pipe 1 and a second casing portion 12 farther from the fluid pipe 1 . Each casing part 11, 12 is formed in a substantially cylindrical shape. These casing portions 11 and 12 are aligned in a line on the same axis and are connected by bolts 14 with their opposing end faces abutted against each other. By removing the bolt 14, the casing parts 11 and 12 can be separated from each other. That is, the casing 10 can be divided at the intermediate portion in the axial direction (vertical direction in FIG. 2). As shown in FIG. 5, an annular sealing material 16 is provided between the facing end surfaces of the casing portions 11 and 12 .

As shown in FIG. 2 , the end surface of the first casing portion 11 facing the fluid pipe 1 forms a contact surface 13 . The contact surface 13 is a partially cylindrical concave surface matching the outer peripheral surface forming the cylindrical surface of the fluid pipe 1 . The inner chamber 11 b of the first casing portion 11 reaches the contact surface 13 and forms an opening 15 . The contact surface 13 has an annular shape surrounding the opening 15 .

As shown in FIG. 4 , a contact-side seal member 41 is attached to the contact surface 13 . The contact-side seal member 41 is formed in a quadrangular annular shape in which, for example, four straight seal members are assembled in a "well" shape. The contact-side seal member 41 may have a circular annular shape. An annular contact-side seal member 41 surrounds the opening 15 .

As shown in FIG. 6, the contact-side sealing member 41 includes a cushion packing 41a and adhesive layers 41b and 41c laminated on both sides thereof. The cushion packing 41a can be compressed and deformed in the thickness direction. A back-side adhesive layer 41 b laminated on the back surface of the cushion packing 41 a is adhered to the contact surface 13 . As shown in FIG. 6A, a release paper 41d is provided on the surface of an adhesive layer 41c laminated on the front surface of the cushion packing 41a facing the fluid pipe 1. As shown in FIG. As shown in FIG. 6B, when attached to the fluid pipe 1, the release paper 41d is peeled off and the adhesive layer 41c is adhered to the outer peripheral surface of the fluid pipe 1. As shown in FIG.
The adhesive layer 41c may be omitted so that the cushion packing 41a directly contacts the outer peripheral surface of the fluid tube 1. FIG.

The second casing portion 12 is arranged closer to the head end side (the side opposite to the opening) than the first casing portion 11 . An annular head piece 19 is provided at the head end portion (upper end portion in FIG. 2) of the second casing portion 12 .

As shown in FIGS. 2 and 3 , one or more (here, three) connectors 51 are provided on the peripheral wall of the casing 10 . Each connector 51 is formed in a tubular shape protruding in the radial direction of the casing 10 . Each connector 51 is provided with a valve 52 and connected to the fluid pipe 2 . The connectors 51 with three (plural) valves 52 are arranged apart from each other in the axial direction of the casing 10 (up and down in FIG. 2).

When distinguishing the connector 51 with the valve 52 and the fluid pipe 2 from each other, A, B, and C are added to the respective reference numerals. As shown in FIG. 2, two connectors 51A and 51B and valves 52A and 52B on the lower (contact surface side) and middle stages are provided on the peripheral wall 11a of the first casing portion 11. As shown in FIG. Internal passages of the connectors 51A and 51B communicate with the internal chamber 11b of the first casing portion 10. As shown in FIG. Corresponding connectors 51A and 51B are opened/closed or adjusted by the valves 52A and 51B, respectively.

The peripheral wall 12a of the second casing portion 12 is provided with an upper connector 51C. An internal passage of the connector 52C communicates with the internal chamber 12b of the second casing portion 12. As shown in FIG. A valve 52C is provided on the connector 51C. The valve 52C opens and closes the connector 51C or adjusts the degree of opening.

As shown in FIG. 3, the axes of the three connectors 51A, 51B, 51C are oriented at different angles in the circumferential direction of the casing 10, but the present invention is not limited to this.
Note that the orientations of the connectors 51A, 51B, and 51C in FIGS. 1, 2, etc. do not match with FIG. 3 for convenience of illustration.

A clamp 20 is attached to the casing 10 as shown in FIG. The casing 10 is fixed to the fluid tube 1 by means of a clamp 20 and the abutment surface 13 is applied to the outer peripheral surface of the fluid tube 1 . The clamp 20 includes a pair of openable and closable drilling-side clamps 21 and receiving-side clamps 22, and a bolt 25 and a nut 26 that secure the clamps 21 and 22 together in a closed state. The clamp 20 is opened by separating or separating the holding bodies 21 and 22, and the clamp 20 is closed by joining the holding bodies 21 and 22 together.
Hereinafter, unless otherwise specified, the clamp 20 is assumed to be in a closed state.

As shown in FIG. 2, the punching-side holding body 21 integrally has a contact plate 21a and a projecting piece 21f. The contact plate 21a is formed in a semicircular shape. As shown in FIG. 4, a fitting hole 21c is formed in the central portion of the contact plate 21a. Protrusions 21f protrude outward from both ends of the contact plate 21a. The end portion (lower end portion in FIG. 2) including the contact surface 13 of the first casing portion 11 is inserted into the fitting hole 21c and welded to the peripheral portion of the fitting hole 21c in the contact plate 21a. ing. The inner surface of the abutment plate 21 a is continuous with the abutment surface 13 without a step and constitutes an extended portion of the abutment surface 13 . The contact-side seal member 41 may protrude from the inner surface of the contact plate 21a as part of the contact surface.

As shown in FIG. 2, the receiving-side holding member 22 integrally has a semicircular contact plate 22a and projecting pieces 22f projecting outward from both ends thereof. A pair of contact plates 21a and 22a are attached to the outer peripheral surface of the fluid pipe 1 so as to sandwich the fluid pipe 1 from both upper and lower sides. The protrusions 21f and 22f on the same side are close to each other and face each other. These projecting pieces 21f and 22f are connected by bolts 25 and nuts 26. As shown in FIG. The head 25a of the bolt 25 is preferably welded and fixed to the lower protruding piece 22f of the protruding pieces 21f and 22f. A neck portion 25b of the bolt 25 is passed through the insertion hole 21g of the upper projecting piece 21f, and a nut 26 is screwed thereon. The clamp 20 is thereby secured to the fluid tube 1 . As a result, the casing 10 is fixed to the fluid pipe 1 .

As shown in FIG. 2, a drilling tool 30 is accommodated within casing 10 . The drilling tool 30 includes a shaft 31, a drilling blade 32, and a connecting projection 33 (connecting end). The shaft 31 is shaped like a straight rod and arranged on the axis of the casing 10 . The casing 10 is provided with two stages of bearings 61 and 62 spaced apart in the axial direction. Specifically, bearings 61 and 62 are provided at both axial end portions of the second casing portion 12 . These bearings 61 and 62 hold the shaft 31 to the casing 10 so as to be rotatable and axially movable. The bearings 61 and 62 form a holding portion that holds the drilling tool 30 so as to allow driving. Preferably, as shown in FIG. 5, annular bearing packings 63 (bearing seal members) are provided between the upper and lower ends of the outer and inner rings of the bearings 61 and 62, respectively.

As shown in FIG. 2 , the inner diameter of the inner chamber 11 b of the first casing part 11 is sufficiently larger than the outer diameter of the shaft 31 and thus the drilling tool 30 . The inner chamber 11b serves as a collection chamber for chips generated when the drilling tool 30 drills.
A punching blade 32 is provided at the tip (lower end) of the shaft 31 . The perforating cutter 32 is configured by a perforating drill coaxial with the shaft 31 . As shown in FIGS. 2 and 7 , the perforating blade 32 can appear and disappear from the opening 15 as the shaft 31 moves up and down.

As shown in FIG. 2 , the proximal end (upper end) of the shaft 31 protrudes from the head end (upper end) of the casing 10 . A stopper 34 is provided on the outer peripheral portion of the proximal end of the shaft 31 . The stopper 34 is formed in an annular shape and protrudes radially from the shaft 31 . A snap ring, for example, is used as the stopper 34 . As shown in FIG. 7, the stop 34 abuts the head end of the casing 10 when the drilling tool 30 is lowered. Specifically, the stopper 34 enters the headpiece 19 and hits the inner ring of the bearing 62 . As a result, the height at which the drilling tool 30 can be lowered (movable position in the tip direction) is regulated. As a result, the amount of protrusion of the perforating blade 32 from the opening 15 is regulated.

As shown in FIG. 2, a connecting projection 33 is provided on the proximal end surface of the shaft 31 . The connecting projection 33 is coaxial with the shaft 31 and protrudes from the shaft 31 in the proximal direction (upward in FIG. 2). The electric drill main body 4 (driving means) is detachably connected to the connecting projection 33 . By driving the electric drill main body 4 , the drilling tool 30 can be rotated at high speed with respect to the casing 10 .

The drilling tool 30 can be pulled out upward (to the second casing portion side) from at least the first casing portion 11 of the casing 10 . Preferably, the drilling tool 30 is separable from the casing 10 by withdrawing it upwardly from the head end of the casing 10, as shown in FIG.

As shown in FIGS. 2 and 5, annular internal seal members 42 and 43 are provided inside the casing 10 . Internal seal members 42 and 43 are in close contact with the entire circumference of the outer peripheral surface of shaft 31 . Thereby, the clearance between the inner peripheral surface of the casing 10 and the outer peripheral surface of the shaft 31 is liquid-tightly sealed. Seals with lips such as oil seals and dust seals or labyrinth seals are used as the internal seal members 42 and 43 .

As shown in FIG. 2, the two internal seal members 42, 43 are axially separated from each other. Specifically, the internal seal members 42 and 43 are provided closer to the bearings 61 and 62 at both ends of the second casing portion 12 in the axial direction, respectively, inside the second casing portion 12 relative to the bearings 61 and 62 . ing. Therefore, the lower internal seal member 42 is arranged on the head side (the side opposite to the opening 15 side) from the connectors 51A and 51B. The upper internal seal member 43 is arranged on the head side (the side opposite to the opening 15 side) from the connector 51C.

As shown in FIGS. 8 to 10, the valve mounting device 3 has a plurality of types of lids 70, 71 and 72. As shown in FIGS. One of these lids 70 , 71 , 72 is selected according to the situation and attached to the casing 10 to close the casing 10 . As shown in FIGS. 8 and 10, the flat lids 70 and 71 are disc-shaped.

As shown in FIG. 9, the convex lid 72 integrally has a lid edge portion 73 and a housing cylinder portion 74 . The lid edge portion 73 is formed in an annular shape. A housing cylinder portion 74 is provided in the central portion of the lid edge portion 73 . The accommodation tube portion 74 is formed in a tubular shape with a downward opening and a closed upper end, and protrudes upward from the lid edge portion 73 .

The valve mounting device 3 is used as follows when cutting, removing, or changing the route of the fluid pipe 1 .
A predetermined position or an arbitrary position of the fluid pipe 1 is selected to install the valve mounting device 3 . That is, the pair of clamping bodies 21 and 22 of the clamp 20 are applied to the outer peripheral surface of the fluid pipe 1 so as to sandwich the fluid pipe 1 from above and below. At this time, the bolt 25 is passed through the insertion hole 21g. Then, the nut 26 is tightened onto the bolt 25 . Since the bolt 25 is welded and fixed to the receiving-side holding member 22, there is no fear of falling off, and there is no need to prevent the head 25a of the bolt 25 from rotating when the nut 26 is tightened. This allows the valve attachment device 3 to be attached to the fluid line 1 simply and quickly. In addition, the mounting work can be easily performed even in a narrow space. For example, if there is a space with a width of about 100 mm, the valve mounting device 3 can be installed. Therefore, the construction time can be greatly shortened, and the worker's exposure dose can be reduced.

When attaching the clamping member 21 to the fluid pipe 1, the release paper 41d is removed in advance. As a result, the adhesive layer 41c of the contact-side seal member 41 is adhered to the outer peripheral surface of the fluid pipe 1. As shown in FIG. By tightening the nut 26, the cushion packing 41a of the contact side seal member 41 is compressed in the thickness direction. Even if the tightening amount of the nut 26 is not strictly controlled, the outer peripheral surface of the fluid pipe 1 and the valve mounting device 3 can be reliably sealed.

Subsequently, the electric drill main body 4 is connected to the connection projection 33 , and the drilling blade 33 is lowered while being rotated at high speed by driving the electric drill main body 4 to protrude from the opening 15 . As a result, a drilled hole 1c is formed in the fluid pipe 1 by the drilling blade 33. As shown in FIG.
As the drilling tool 30 is lowered, the stopper 34 eventually abuts against the head end (upper end) of the casing 10 to prevent further descent. As a result, it is possible to prevent the drilling tool 30 from being excessively pushed in, and to avoid drilling a hole in the fluid pipe 1 on the opposite side of the drilled hole 1c by 180 degrees. Therefore, the operator's skill level is not required.
After that, the electric drill main body 4 is separated from the connecting projection 33 of the drilling tool 30 and removed.
Chips generated during drilling are collected in the inner chamber 11 b of the first casing portion 11 . This can prevent chips from flowing into the second fluid pipe 2 .

The fluid pipe 1 and the inner chamber of the casing 10 are communicated with each other through the drilled hole 1c.
The valve 52 is left open. This allows the radioactively contaminated water (fluid) in the fluid pipe 1 to be discharged or rerouted through the inner chamber of the casing 10 and the second fluid pipe 2 . The flow rate can also be adjusted by adjusting the opening of the valve 52 .
The contact-side sealing member 41 can prevent the radioactive contaminated water (fluid) from leaking out from between the outer peripheral surface of the fluid pipe 1 and the valve mounting device 3 .

Preferably, by opening one or both of the lower and middle valves 52A and 52B, the radioactive contaminated water (fluid) in the fluid pipe 1 is discharged from the inner chamber 11b of the first casing part 10 to the second fluid pipe 2A, Eject or reroute via 2B. This allows the fluid tube 1 to be drained. Alternatively, the water pressure in the fluid pipe 1 can be lowered. Therefore, it is possible to prevent the radioactively contaminated water from rising from the inner chamber 11b of the first casing portion 11 and flowing into the inner chamber 12b of the second casing portion 11 . Even if radioactively contaminated water tries to rise further from the inner chamber 11b of the first casing portion 11, the inner sealing member 42 can prevent it from flowing into the inner chamber 12b of the second casing portion 11. FIG.

More preferably, the upper valve 52C is also opened, so that if radioactively contaminated water should flow into the inner chamber 12b of the second casing part 11, the radioactively contaminated water is directed to the second fluid pipe 2C. It can be guided and discharged. Further, the internal seal member 43 can prevent the radioactive contaminated water from rising further.
This allows the radioactive contaminated water to be discharged or rerouted without any leakage to the outside.

If it takes a long time to discharge the radioactively contaminated water from the fluid pipe 1, the valve 52 can be closed to interrupt the discharge operation. After that, the valve 52 can be opened to resume the discharge operation.

As shown in FIG. 8, a flat lid 70 is provided at the head end (upper end) of the casing 10 as required after drilling the drilled hole 1c or when the discharging operation is interrupted. At that time, first, the drilling tool 30 is pulled upward from the casing 10 . Also, the headpiece 19 is removed. Instead of the headpiece 19, a flat lid 70 is attached to the head end of the casing 10 by bolting. This allows the head end to be closed.
The drilling tool 30 that has been pulled out can be reused for drilling holes in other locations and thus valve mounting work.

When it is desired to avoid exposing the drilling tool 30 to the outside of the valve mounting device 3, a convex lid 72 is used as shown in FIG. 9 instead of the flat lid 70 (FIG. 8). In this case, only the headpiece 19 is removed without withdrawing the drilling tool 30 from the casing 10 . A convex lid 72 is attached to the head end of the casing 10 instead of the head piece 19 . That is, while the connecting projection 33 separated from the electric drill main body 4 is accommodated in the accommodating cylinder portion 74, the convex lid 72 is put on the end of the head. The lid edge 73 of the convex lid 72 is bolted to the head end. This allows the head end to be closed while the drilling tool 30 remains within the casing 10 .

As shown in FIG. 10, the second casing part 12 together with the drilling tool 30 may be separated from the first casing part 11 . A flat lid 71 is attached to the end of the separated first casing 11 on the side of the second casing (an intermediate portion closer to the head end than at least one connector 51 of the casing 10). As the flat lid 71, the same one as the flat lid 70 may be used.

As shown in FIG. 11, the separated second casing part 12 (the part closer to the head end than the intermediate part) and the drilling tool 30 can be reused for drilling and valve mounting at other locations of the fluid pipe 1. can be done. Accordingly, the valves 52 can be attached at a plurality of positions separated from each other in the axial direction of the fluid pipe 1 .
Cost reduction can be achieved by reusing the relatively expensive drilling tool 30 and the second casing part 12 including the internal seal members 42 and 43 and the bearings 61 and 62 for valve mounting work at a plurality of locations.

After the radioactively contaminated water inside the fluid pipe 1 is discharged or the internal pressure is sufficiently lowered as described above, the fluid pipe 1 is cut and removed or the route is changed. As a result, scattering of radioactively contaminated water during cutting can be reliably avoided.

Next, another embodiment of the present invention will be described. In the following embodiments, the same reference numerals are given to the drawings to duplicate the configurations already described, and the description thereof will be omitted.
<Second Embodiment (Figs. 12 to 14)>
As shown in FIG. 12, in the valve mounting device 3B according to the second embodiment, an intermediate valve 80 is interposed between the first casing portion 11 and the second casing portion 12 of the casing 10. As shown in FIG. The intermediate valve 80 is composed of a manually operated gate valve.

Specifically, the intermediate valve 80 includes a valve body 81 , a valve body 82 , a valve stem 83 and a handle 84 . The valve box 81 is formed in a generally circular box shape with both upper and lower ends opened. A lower end portion of the valve box 81 is connected to the first casing portion 11 via an annular connecting piece 17 by bolting. An upper end portion of the valve box 81 is connected to the second casing portion 12 via an annular connecting piece 18 by bolting.
An internal seal member 42 is provided in the connecting piece 18 in the valve mounting device 3B. Although the internal seal member 43 (see FIG. 2) on the head end side is omitted, the internal seal member 43 may be provided in the second casing portion 12 .

A valve body 82 is housed inside the valve box 81 . The valve body 82 is connected to and supported by the valve stem 83 . The valve stem 82 extends in a direction perpendicular to the axial direction of the casing 10 and protrudes from the valve box 81, and a handle 84 is provided at the protruding end. By rotating the handle 84 , the valve stem 83 and thus the valve body 82 are advanced and retracted in the orthogonal direction, and the valve body 82 is seated on and removed from the seat portion 85 on the inner surface of the valve box 81 . The intermediate valve 80 is thereby opened and closed.

As shown in FIG. 12, the valve body 82 in the unseated state does not interfere with the drilling tool 30, and the intermediate valve 80 in the open state allows the drilling tool 30 to pass through. This allows the drilling tool 30 to be driven and the fluid tube 1 to be drilled.

As shown in FIG. 13, the drilling tool 30 is withdrawn, for example, when closing the head end of the casing 10 for interrupting the ejection operation. As a result, the valve body 82 is seated on the valve seat 85 to close the intermediate valve 80 . A lid 70 is provided at the head end (upper end) of the casing 10 . According to the second embodiment, by closing the intermediate valve 80 in addition to the lid 70, leakage of radioactively contaminated water (fluid) can be prevented more reliably.

The second casing part 12 and the connecting piece 18 together with the drilling tool 30 may be separated from the intermediate valve 80, as shown in FIG. In this case, a flat lid 71 is provided at the end of the separated intermediate valve 80 on the side of the second casing (an intermediate portion closer to the head end than at least one connector 51 of the casing 10) to close the valve.
The separated second casing part 12 and connecting piece 18 (the portion closer to the head end than the intermediate part) and the drilling tool 30 can be reused for valve mounting at other locations, as in the first embodiment. can be done.

The present invention is not limited to the embodiments described above, and various modifications can be made without departing from the scope of the invention.
For example, the number of connectors 51 with valves 52 in the valve mounting device is not limited to three, and may be one, two, or four or more. It is sufficient that the first casing part 11 is provided with at least one connector with a valve including the connector 51A with a valve 52A in the vicinity of the opening 15 .
In the clamp 20, the nut 26 may be fixed to either one of the clamping bodies 21 and 22 by welding or the like, and the bolt 25 may be screwed into the nut 26 by turning. Either one of the holding bodies 21 and 22 may be formed with a female screw hole as a nut.
It is also possible to provide the present valve mounting device at the lower end of the U-shaped bent portion of the fluid pipe and use it as a drain pipe.
The fluid in the fluid tube may be gas.
The casing is not limited to a tubular shape, and may be box-shaped.
The casing is not limited to two stages, but may have one stage, or may have three or more stages of casing parts.

INDUSTRIAL APPLICABILITY The present invention can be applied, for example, to the decommissioning work of a nuclear power plant.

1 Fluid pipe 1c Drill hole (hole)
2, 2A to 2C Drain pipes 3, 3B Valve mounting device 4 Electric drill body 10 Casing 11 First casing part 11a Peripheral wall 11b Inner chamber 12 Second casing part 12a Peripheral wall 12b Inner chamber 13 Contact surface 15 Opening 20 Clamp 21 Drilling side Clamping body 21a Contact plate 21c Fitting hole 21f Projection 21g Insertion hole 22 Receiving side clamping body 22f Projection 25 Bolt 25a Head 25b Neck portion 26 Nut 30 Drilling tool 32 Drilling blade 33 Connection projection (connection end)
34 stopper 41 contact side seal member 41a cushion packing 41b, 41c adhesive layer 41d release paper 42, 43 internal seal member 51, 51A to 51C connector 52, 52A to 52C valve 61, 62 bearing 63 bearing packing (bearing seal member)
70, 71 flat lid (lid)
72 convex lid (lid)
73 Lid edge portion 74 Housing cylinder portion 80 Intermediate valve

Claims (7)

A device for attaching a valve to a fluid line, comprising:
a casing having an abutment surface that forms a partially cylindrical concave surface that matches the outer peripheral surface of the fluid pipe, and an inner chamber that reaches the abutment surface to form an opening;
one or more connectors having the valve and provided on the casing;
a clamp for fixing the casing to the fluid pipe such that the contact surface is applied to the outer peripheral surface of the fluid pipe;
a drilling tool that is housed and held in the casing, has a tip drilling tool that can be retracted from the opening, and has a connecting end on the opposite side of the drilling tool that is connected to a drive means;
A valve mounting device comprising: The clamp has a drilling-side clamping body fixed to the casing, a receiving-side clamping body that clamps the fluid pipe between the drilling-side clamping body, and bolts and nuts that connect these clamping bodies together. 2. The valve mounting device according to claim 1, wherein the bolt or the nut is fixed to one of the holding members. The contact surface is provided with an annular contact-side sealing member surrounding the opening,
3. The valve mounting device according to claim 1, wherein the contact-side sealing member includes a cushion packing compressible in a thickness direction. 4. The inner peripheral surface of the casing on the side opposite to the opening with respect to at least one connector is provided with an annular internal seal member that is in close contact with the drilling tool. 2. The valve mounting device according to item 1. The casing includes a cylindrical first casing portion including the abutment surface and at least one connector, and a first casing portion disposed on the side opposite to the opening of the first casing portion and detachably connected to the first casing portion. and a tubular second casing portion,
The drilling tool can be pulled out from the first casing part toward the second casing part, and the second casing is provided with a holding part that holds the drilling tool so as to allow driving. The valve mounting device according to any one of claims 1 to 6, characterized by: An intermediate valve is provided between the first casing portion and the second casing portion that allows the drilling tool to be inserted in an open state and that can be closed when the drilling tool is pulled out. The valve mounting device according to any one of claims 1 to 5. A lid can be attached to the head end portion of the casing opposite to the opening, or a middle portion of the casing closer to the head end side than at least one connector has the head further than the middle portion. A valve mounting device according to any one of claims 1 to 6, characterized in that a lid is mountable separately from the end portion and the drilling tool.

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