JP5639920B2 - Connection member removal method - Google Patents

Description

  The present invention separates the facing surfaces of the communication pipe side flange of the communication pipe communicated with the existing fluid pipe and the connection member side flange communicated with the connection member, and inserts a valve body to seal the communication pipe. The present invention relates to a connection member attaching / detaching method in which a closing member to be closed is inserted into a communication pipe, and the connecting member is attached / detached in a continuous flow state.

  In the conventional desorption device, when a connecting member such as an air valve or a repair valve connected to a communication pipe of an existing fluid pipe through a flange is detached from the existing fluid pipe for replacement or maintenance, the conventional desorption apparatus is in communication. After inserting the valve body between the opposing faces of the flange of the pipe and the flange of the connection member to seal the communication pipe, the closure device is attached to the flange short pipe attached to the communication pipe instead of the connection member, A blocking device is attached to the flange of the repair valve to release the sealing of the communication pipe by the valve body, and the closing member is inserted into the communication pipe from the housing case of the closing device, and the elastic body of the closing member is expanded in the diameter direction of the communication pipe The communication pipe is closed by bulging, and a new connection member is attached to the short flange pipe instead of the closing member (see, for example, Patent Document 1).

JP 2010-169222 A (page 11, FIG. 14)

  However, in the method for attaching and detaching the connecting member described in Patent Document 1, if the inner diameter dimension of the flange short pipe is shorter than the inner diameter dimension of the communication pipe, the closing member is inserted into the flange short pipe. In this case, it is necessary to reattach a closing device having a closing member that can be inserted into the short flange tube, and the work of attaching a new connecting member is delayed. There is.

  The present invention has been made paying attention to such problems, and even if the communication hole connected to the connection member has a smaller diameter than the inner diameter dimension of the communication tube, the inside of the communication tube is always blocked by the blocking member. An object of the present invention is to provide a connecting member detaching method capable of connecting a new connecting member.

In order to solve the above-mentioned problem, a method for detaching a connecting member according to the present invention includes:
The opposing surfaces of the communication pipe side flange of the communication pipe communicating with the existing fluid pipe and the connection member side flange communicating with the connection member are spaced apart, the valve body is inserted to seal the communication pipe, and the communication pipe is closed. A connecting member detaching method for inserting a blocking member into the communication pipe and detaching the connecting member in an uninterrupted flow state,
The connection member is connected to a communication hole that penetrates the blocking member at a diameter at which the connection member side flange cannot be inserted;
Removing the connection member from the communication hole after inserting the valve body between opposing surfaces of the communication pipe side flange and the connection member side flange, and cutting the periphery of the communication hole in the connection member side flange. A step of forming a through-hole having a diameter into which the blocking member can be inserted, a step of inserting the blocking member into the through-hole and blocking the inside of the communication pipe by the blocking member, and a new one in the communication pipe-side flange Connecting the connecting member.
According to this feature, by cutting the flange on the connection member side, a through hole having a diameter into which the closing member can be inserted can be formed. Therefore, the communication hole is formed to have a small diameter through which the closing member cannot be inserted. However, the inside of the communication tube can be closed by always reliably inserting the closing member into the communication tube.

The method for attaching and detaching the connecting member of the present invention comprises:
The cutting member for cutting the flange on the connection member side includes a hole saw that forms the through hole and a center drill that protrudes from the center of the hole saw in the tube axis direction of the communication pipe. The hole saw is positioned using holes.
According to this feature, the connecting member side flange can be cut to form a through hole in a state where the hole saw is stabilized via the center drill and the communication hole.

The method for attaching and detaching the connecting member of the present invention comprises:
The communication hole is provided with a plug for positioning the hole saw after the connection member is removed, and the center drill is configured to collect the plug of the connection member side flange cut by the hole saw. It is characterized by having a latching portion for latching to.
According to this feature, the section including the plug generated by dividing the connection member side flange can be held by the locking portion so as not to flow into the existing fluid pipe from the communication pipe.

The method for attaching and detaching the connecting member of the present invention comprises:
The center of the surface of the plug facing the center drill is formed as a recess toward the communication pipe side.
According to this feature, when the connecting member side flange is cut by the hole saw, the through hole can be accurately formed at the same center as the communication hole by guiding the center drill to the center of the plug by the recess. The cutting preparation can be performed in a state where the cutting member is brought close to the communicating pipe side flange.

The method for attaching and detaching the connecting member of the present invention comprises:
A shaft member extending along the tube axis direction of the communication tube is supported by the communication tube, and the closing member is supported by the shaft member so as to be movable along the shaft member. It is characterized by that.
According to this feature, when the blocking member is inserted into the communication pipe, the blocking member is moved along the shaft member, so that the blocking member is accurately placed in the communication pipe against the fluid pressure of the fluid flowing in the existing fluid pipe. Can be inserted.

It is a partial cross section figure which shows the state attached so that the air valve in an Example might be connected to a communicating pipe. It is a partial cross section figure which shows the state which attached the attachment member. It is a partial cross section figure which shows the state which replaced the communication hole with the air valve and was obstruct | occluded with the plug. It is a partial cross section figure which shows the state which welded the flange short pipe to the air valve side flange. It is a partial cross section figure which shows the state which attached the cutting device. It is a partial cross section figure which shows the state which cut the connection member side flange. It is a partial cross section figure which shows the state which attached the repair valve. It is a partial cross section figure which shows the state which attached the obstruction | occlusion apparatus. It is a partial cross section figure which shows the state which inserted and sealed the obstruction | occlusion member in the communicating pipe. It is a partial cross section figure which shows the state which removed the attachment member. It is a partial cross section figure which shows the state which fixed the obstruction | occlusion member in the communicating hole. It is a partial cross section figure which shows the state which removed the repair valve and the storage case. It is a partial cross section figure which shows the state which attached the new repair valve and the storage case. It is a partial cross section figure which shows the state which accommodated the closure member in the storage case. It is a side view which shows the state which removed the obstruction | occlusion apparatus. It is a side view which shows the state which attached the new air valve. It is a partial cross section figure which shows the connection of the flange short pipe and communication pipe in a modification.

  EMBODIMENT OF THE INVENTION The form for implementing the removal | desorption method of the connection member which concerns on this invention is demonstrated below based on an Example.

  A method for attaching and detaching a connection member according to the embodiment will be described with reference to FIGS. As shown in FIG. 1, in order to discharge the air in the pipe of the existing fluid pipe P as a water transport pipe to the outside of the pipe, or to prevent the inside of the pipe from becoming a negative pressure, a predetermined portion of the existing fluid pipe P In addition, a small air valve AV1 is provided as a connecting member in the present invention.

  More specifically, the existing fluid pipe P has a communication pipe B extending upward, and a flange F1 as a communication pipe side flange in the present invention is formed at the upper end portion of the communication pipe B. . And the flange F2 as a connection member side flange in this invention is arrange | positioned above the flange F1.

  The opposing surfaces S and T of the pair of flanges F1 and F2 are in close contact with each other via a packing by tightening the pair of flanges F1 and F2 with a plurality of existing bolts 18 and nuts 19. In addition, a communication hole 4 having a diameter L1 and facing in the vertical direction is formed through the center of the flange F2. The communication hole 4 has a female screw threaded on the inner peripheral surface thereof, and a lower end portion of the air valve AV1 is screwed thereon. For this reason, the air valve AV1 communicates with the existing fluid pipe P through the communication pipe B, and the air in the existing fluid pipe P can be discharged out of the pipe.

  As shown in FIG. 1, when the small air valve AV1 is replaced with a larger air valve AV2 (see FIG. 16), the air valve AV1 is removed by attaching an air valve demounting device to the flange F1 and the flange F2. The air valve AV2 is attached.

  In order to remove the air valve AV1, first, as shown in FIG. 2, the attachment member 3 capable of forming a gap between the opposing surfaces S and T of the pair of flanges F1 and F2 is attached. The mounting member 3 is connected to the valve body 2a, the valve housing part 2 for housing the valve body 2a, the arcuate part 24 connected to the valve housing part 2, and bolts and nuts (not shown) to the arcuate part 24. Arc-shaped portion 23 to be formed. The valve housing part 2 has an internal space structure for housing the valve body 2a, and the valve body 2a can be advanced and retracted by pushing and pulling the valve shaft 2c. Further, the valve accommodating portion 2 is provided with a drain valve 2b for discharging the internal fluid to the outside of the mounting member 3.

  In the center of the inner wall surface of the arc-shaped portions 23 and 24, bulge portions 23a and 24a that bulge toward the inner diameter direction are formed. The bulging portions 23a and 24a have a relatively thin thickness that can be inserted between the opposing surfaces S and T of the pair of flanges F1 and F2 to which the arc-shaped portions 23 and 24 are attached. Water stop members 23c, 24c, 23d and 24d made of an elastic material fitted in respective fitting grooves formed over the inner wall portions are arranged on the upper and lower portions of the inner wall portions of the arc-shaped portions 23 and 24, respectively. Established. Further, the arcuate portions 23, 24 are formed with lower flange portions 23f, 24f extending from the lower ends thereof toward the arc-shaped portions 24, 23, and the lower flange portions 23f, 24f are illustrated in the figure. A plurality of bolts that are not engaged are respectively screwed together.

  In order to attach the mounting member 3 configured as described above to the pair of flanges F1 and F2, first, the existing bolt 18 and the nut 19 are replaced with the working bolt 5 and the working nut 6 one by one. After the replacement, the attachment member 3 is attached to the pair of flanges F1, F2 from the circumferential direction as shown in FIG. At this time, the water stop members 23d and 24d are in close contact with the entire circumference of the peripheral surface of the flange F1, and the water stop members 23c and 24c are in close contact with the entire periphery of the peripheral surface of the flange F2. The parts 23a and 24a are disposed between the opposing surfaces S and T of the flanges F1 and F2.

  In this state, the plurality of bolts screwed into the lower flange portions 23f and 24f described above are screwed into the flange F1, thereby bringing the tip ends of the plurality of bolts into contact with the bottom surface of the flange F1. By bringing the tip ends of the plurality of bolts into contact with the bottom surface of the flange F1, the flange F1 is clamped by the plurality of bolts and the bulging portions 23a, 24a, and the mounting member 3 is fixed to the flange F1. The

  Next, as shown in FIG. 2, after opening the drain valve 2 b of the valve housing 2, each working nut 6 is gradually loosened with respect to the working bolt 5, and the flange F <b> 2 is placed inside the existing fluid pipe P. It is pushed up by the pressure of the fluid flowing through. When the flange F2 is pushed up by the pressure of the fluid flowing in the existing fluid pipe P, the opposed surfaces S and T of the flanges F1 and F2 are separated to fill the valve housing portion 2 with the fluid. Since the water stop members 23d and 24d are in close contact with each other on the entire surface and the water stop members 23c and 24c are in close contact with each other on the entire periphery of the flange F2, the drainage of the fluid from the attachment member 3 is drained. It is limited only from the valve 2b. Further, the drain valve 2b is closed after the drainage from the drain valve 2b is confirmed.

  When a gap is formed between the opposing surfaces S and T of the flanges F1 and F2 due to the pressure of the fluid flowing in the existing fluid pipe P, as shown in FIG. 3, the valve body 2a is inserted into the gap by pushing the valve shaft 2c. Insert. Then, by tightening the working bolt 5 and the working nut 6, the valve body 2 a is brought into close contact with the opposing surfaces S and T of the pair of flanges F 1 and F 2 to seal the communication pipe B. While the communication pipe B is sealed by the valve body 2a, the air valve AV1 is removed from the communication hole 4, and the male screw part of the plug 7 is screwed into the female screw part of the communication hole 4 instead of the air valve AV1. The communication hole 4 is closed. The central portion of the upper portion of the plug 7 is recessed on the side of the communication pipe B, that is, a recess 7a that opens upward is formed.

  Next, as shown in FIG. 4, the flange short pipe 8 is disposed on the upper surface of the flange F2 in a state in which the communication pipe B is kept sealed by the valve body 2a. The short flange 8 has a flange 8a formed at the lower end and a flange 8b formed at the upper end. Among these flanges 8a and 8b, packing is provided on the lower surface of the flange 8a over the entire circumference of the flange 8a, and a plurality of insertions for inserting the respective work bolts 5 into predetermined positions of the flange 8b. A hole 8c is formed penetrating in the vertical direction.

  For this reason, the flange short pipe 8 is disposed on the upper surface of the flange F2 while the working bolt 5 is inserted into each insertion hole 8c formed in the flange 8b, thereby preventing the flange short pipe 8 from rotating in the horizontal direction. At the same time, the packing is clamped between the flange 8a and the flange F2, and the flange F2 and the flange short pipe 8 are connected in a watertight manner. In this state, a predetermined portion between the flange 8a and the flange F2 is appropriately welded, and the flange short pipe 8 is fixed to the flange F2 so as not to move.

  As shown in FIG. 5, the repair valve 9 is disposed on the upper surface of the flange 8b on the upper surface of the flange 8b. The repair valve 9 has a flange 9a formed at the lower end portion and a flange 9b formed at the upper end portion. A plurality of illustrated bolts for inserting the respective work bolts 5 into predetermined portions of the flange 9a. An insertion hole that is not formed is formed so as to penetrate in the vertical direction.

  For this reason, the repair valve 9 is disposed on the upper surface of the flange 8b through the packing while the work bolt 5 is inserted into the insertion hole, and then the flanges 8b and 9a are screwed into the work bolt 5 and a pair of nuts. The flanges 8b and 9a are brought into close contact with each other by being pinched by 17 and 17, and the repair valve 9 and the flange short pipe 8 are connected in a watertight manner with the repair valve 9 being released.

  Furthermore, by arranging the cutting device 10 on the upper surface of the flange 9b, the repair valve 9 and the cutting device 10 are connected in a watertight manner. The cutting device 10 includes a cylindrical body 10a that is in close contact with the flange 9b, a shaft member 10b that extends in the tube axis direction of the communication pipe B and is rotatable about the axis, and a flange F2 that is provided at the lower end of the shaft member 10b. Is mainly composed of a hole saw 10c for perforating.

  The hole saw 10c is provided with a center drill 10d having a diameter smaller than that of the communication hole 4 and projecting downward in the tube axis direction of the communication pipe B. The hole saw 10c and the center drill 10d are used to cut the cutting member according to the present invention. Is configured. The shaft member 10b, the hole saw 10c, and the center drill 10d are disposed on the same axis.

  Furthermore, although not particularly shown, the center drill 10d is formed with a recess that opens in the horizontal direction, and a locking piece 10e as a locking portion in the present invention is accommodated in the recess. . As shown in FIGS. 5 and 6, the base end portion of the locking piece 10 e is pivotally supported by a pivot shaft 10 f that faces in the horizontal direction in the recess. The locking piece 10e is rotated toward the side of the center drill 10d with respect to the pivot 10f, so that the tip portion protrudes outward of the center drill 10d.

  In order to cut the flange F2 with the hole saw 10c and the center drill 10d in this way, first, the hole saw 10c and the center drill 10d are moved toward the existing fluid pipe P while rotating around the shaft member 10b. At this time, the lower end portion of the center drill 10d is disposed in the concave portion 7a on the upper surface, which is the surface facing the center drill 10d in the plug 7, so that the cutting position is accurately positioned with respect to the flange F2 of the hole saw 10c. .

  By further moving the hole saw 10c and the center drill 10d toward the existing fluid pipe P from this state, the center portion of the plug 7 is first drilled by the center drill 10d, and then the hole saw 10c is positioned. The periphery of the communication hole 4 in the flange F2 is cut by 10c. The locking piece 10e comes into contact with the upper surface of the plug 7 and the inner peripheral surface of the plug 7 formed by drilling the center drill 10d, so that the upper end of the locking piece 10e is from the lower surface of the plug 7. Is also disposed in the recess formed in the center drill 10d until it is disposed at a lower position.

  As shown in FIG. 6, after the drain valve 2b is opened and the valve element 2a is accommodated in the valve accommodating portion 2, the diameter of the communication hole 4 is larger than the diameter L1 by cutting the flange F2 of the hole saw 10c. When the through hole 11 having L2 is formed in the flange F2, the locking piece 10e rotates with respect to the pivot, and the upper end protrudes outward of the center drill 10d.

  From this state, the drain valve 2b is closed again, and the hole saw 10c and the center drill 10d are pulled back into the cylindrical body 10a with the section 21 of the flange F2 including the plug 7 generated by the hole saw 10c forming the through hole 11. At this time, as described above, the section 21 is locked at the bottom by the locking piece 10e having the tip disposed outside the center drill 10d, and is pulled back into the cylindrical body 10a together with the hole saw 10c and the center drill 10d.

  Thus, after the communication hole 4 is once closed with the plug 7, the plug 7 is drilled with the center drill 10 d, so that the bottom of the section 21 can be reliably locked by the locking piece 10 e. Then, as shown in FIG. 7, after the hole saw 10 c, the center drill 10 d, and the section 21 are pulled back into the cylindrical body 10 a, the repair valve 9 is closed, and the cutting device 10 is removed from the repair valve 9.

  Next, as shown in FIG. 8, a closing device 15 is connected to the upper end portion of the repair valve 9 in a watertight manner instead of the cutting device 10. The closing device 15 is integrally connected to a housing case 12 attached to the repair valve 9 in a watertight manner, a closing member 13 that is housed in the housing case 12 and closes the communication pipe B, and an upper end portion of the closing member 13. The insertion member 14 protrudes from the upper surface of the housing case 12 and is provided so as to be movable up and down in a watertight manner with respect to the housing case 12.

  The housing case 12 has, at its lower end, a flange 12a that can be connected to the flange 9b of the repair valve 9 in a watertight manner. The flange 12a corresponds to a bolt insertion hole (not shown) formed in the flange 9b of the repair valve 9. A bolt insertion hole (not shown) is formed. In addition, a closing member 13 is accommodated inside the accommodation case 12, and an insertion hole 12b through which the insertion member 14 is inserted in a watertight manner is formed on the upper surface of the accommodation case 12.

  Furthermore, drainage valves 12d and 12e are provided above the storage case 12 so as to be openable and closable with the interior of the storage case 12. Among these, the drain valve 12d is provided above the drain valve 12e. Further, the drain valve 12e is formed with a larger diameter than the drain valve 12d, and when opened, the water stop state can be confirmed when the closing member 13 described later is inserted.

  The insertion member 14 is mainly composed of an outer cylindrical portion 14a formed in an inner cylindrical shape and an inner collar portion 14b that is rotatably inserted in the outer cylindrical portion 14a, and an outer periphery of the outer cylindrical portion 14a. The surface is inserted through the packing 12c into the insertion hole 12b of the housing case 12 so as to be movable up and down, and the closing member 13 is integrally connected to the lower end portion of the inner flange portion 14b, and the upper end of the inner flange portion 14b. The part is provided with a feed screw 14c that allows a water-stopping rubber 13a described later to expand and contract in the radial direction.

  Moreover, the moving arm 20 which faces the horizontal direction is attached to the upper end part of the outer cylinder part 14a. Insertion holes 20a and 20a (see FIG. 9) into which long bolts 42 and 42, which will be described later, can be inserted, are formed at both ends of the moving arm 20 in the horizontal direction. The closing member 13 in the present embodiment has a diameter L3 that is shorter than the diameter L2 of the through hole 11 and longer than the diameter L1 of the communication hole 4 described above (that is, L2> L3). > L1).

  In addition, the fixing member 41 is attached to the communication pipe B. The fixing member 41 is composed of substantially symmetrical fixing pieces 41c and 41c (one is not shown) which are circularly connected to each other by bolts and nuts (not shown). Further, the fixing member 41 is screwed with a bolt (not shown) from each of the fixing pieces 41c and 41c toward the communication pipe B, so that the tip of the bolt is caused by a frictional force generated between the outer peripheral surface of the communication pipe B. It is fixed at a certain height position. Then, as shown in FIG. 8, the long bolt as the shaft member in the present invention is arranged at both ends in the horizontal direction of the fixing member 41 configured in this way toward the upper side in the tube axis direction of the communication pipe B. 42 and 42 are extended.

  In order to close the communication pipe B, after attaching the closing device 15 and the fixing member 41 in this manner, as shown in FIG. 9, the repair valve 9 is opened after the drain valve 12d is opened. Fill up to fluid. After confirming that the fluid is discharged from the drain valve 12d, the drain valve 12d is closed and the drain valve 12e is opened, and the long bolts 42, 42 are inserted into the insertion holes 20a, 20a formed in the moving arm 20. To go. By inserting the long bolts 42, 42 through these insertion holes 20 a, 20 a, the insertion member 14 is pushed toward the communication pipe B along the long bolts 42, 42, and the blocking member 13 is inserted through the through hole 11. Are arranged in the pipe of the communication pipe B.

  In the process of disposing the blocking member 13 in the pipe of the communication pipe B, when foreign matter such as rust is formed on the inner peripheral surface of the communication pipe B, the foreign substance is peeled off when the blocking member 13 comes into contact with the foreign substance. However, the removed foreign matter is discharged from the drain valve 12e to the outside of the housing case 12 by the water flow generated toward the drain valve 12e opened from the existing fluid pipe P. It has become.

  After the closing member 13 is disposed in the pipe of the communication pipe B by pushing the insertion member 14 along the long bolts 42 and 42 toward the communication pipe B for a predetermined distance, the horizontal ends of the movable arm 20 are long. The position of the closing member 13 disposed in the pipe of the communication pipe B is fixed by clamping the bolts 43, 43 screwed into the bolts 42, 42 from above and below.

  Next, the feed screw 14c is rotated with a ratchet or the like (not shown), and the water stop rubber 13a of the closing member 13 connected to the lower end portion of the inner flange portion 14b is extended in the radial direction to the inner peripheral surface of the communication pipe B in the circumferential direction The inside of the communication pipe B is closed. The blockage of the inside of the communication pipe B by the blocking member 13 can be confirmed by stopping the discharge of the fluid from the drain valve 12e. That is, the step of forming the through hole 11 by the hole saw 10c in the present embodiment described above is a step for closing the communication pipe B using the closing member 13 having a diameter L3 larger than the diameter L1 of the communication hole 4. It is.

  Then, as shown in FIG. 10, the mounting member 3 is removed from the pair of flanges F1, F2 by removing bolts and nuts (not shown) connecting the arcuate portions 23, 24. Furthermore, as shown in FIG. 11, the flanges F2, the flange short pipe 8, the repair valve 9 and the housing case 12 are slightly lifted upward by further separating the opposing surfaces S and T of the pair of flanges F1 and F2, and split into two. The retaining bracket 71 having a structure is attached by being clamped from above and below by bolts 53 and 53 screwed into the long bolts 42 and 42 so as to be sandwiched between the closing member 13 and the outer cylinder portion 14a. . By doing so, it is possible to prevent the blocking member 13 from being pulled out due to the fluid pressure in the existing fluid pipe P by the attached retaining fitting 71.

  Next, the moving arm 20 is moved upward by screwing the bolts 43 and 43, and the flange short pipe 8, the repair valve 9 and the housing case 12 are pulled up and removed as shown in FIG. Thereafter, as shown in FIG. 13, the new repair valve 16 and the housing case 12 are inserted into the outer cylinder portion 14 a of the insertion member 14 and suspended, and supported by the moving arm 20 so that the closing member 13 does not come out. Then, the retaining bracket 71 is removed. The repair valve 16 is connected to the flange F1 of the communication pipe B in a watertight manner with an existing bolt 18 and a nut 19, and the housing case 12 is installed above the repair valve 16.

  Then, as shown in FIG. 14, the water stop rubber 13 a is reduced by operating the feed screw 14 c, the closing member 13 is pulled up to the inside of the housing case 12, and the repair valve 16 is closed. From this state, as shown in FIGS. 15 and 16, the occlusion device 15 is removed from the repair valve 16, and instead of the occlusion device 15, the repair valve 16 is connected to the new air valve AV <b> 2 in a watertight manner, and then the repair valve again. By opening 16, the air valve AV <b> 2 can be used to discharge the air inside the existing fluid pipe P to the outside of the pipe.

  In this embodiment, the flange short pipe 8 and the flange F2 are welded to each other so that the flange short pipe 8 is fixed to the flange F2 so as not to move. As a modified example, as shown in FIG. After inserting the working bolt 5 into the insertion hole 8c, the nut 54 is screwed into the working bolt 5 so that the flange short pipe 8 is pressed against the flange F2 by the nut 54, so that the flange short pipe 8 is flanged. It may be fixed so as not to move with respect to F2. By doing in this way, it is not necessary to bring in equipment for welding the flange short pipe 8 and the flange F2, and the work of detaching the air valves AV1, AV2 can be simplified.

  As described above, in the method for attaching and detaching the air valves AV1 and AV2 in the present embodiment, the step of removing the air valve AV1 from the communication hole 4 after inserting the valve body 2a between the opposing surfaces S and T of the flange F1 and the flange F2. Cutting the periphery of the communication hole 4 in the flange F2 to form a through hole 11 having a diameter into which the blocking member 13 can be inserted; and inserting the blocking member 13 into the through hole 11 and connecting the communication tube B with the blocking member 13; Since there is a step of closing the inside and a step of newly connecting the air valve AV2 to the flange F1, the through-hole 11 having a diameter into which the closing member 13 can be inserted is formed by cutting the flange F2. Therefore, even if the communication hole 4 is formed to have a small diameter in which the blocking member 13 cannot be inserted, the blocking member 13 can always be reliably inserted into the communication tube B to block the communication tube B.

  The cutting member that cuts the flange F2 includes a hole saw 10c that forms the through hole 11, and a center drill 10d that protrudes from the center of the hole saw 10c in the direction of the tube axis of the communication pipe B. The center drill 10d is connected to the center drill 10d. Since the hole saw 10c is positioned by using the hole 4, that is, by piercing the plug 7 that once closed the communication hole 4, the hole saw 10c is stabilized through the center drill 10d and the communication hole 4, The through hole 11 can be formed by cutting the flange F2.

  The communication hole 4 is provided with a plug 7 for positioning the hole saw 10c after the air valve AV1 is removed, and the center drill 10d is plugged in order to collect the section 21 of the flange F2 divided by the hole saw 10c. 7 is provided with the locking piece 10e to prevent the section 21 including the plug 7 generated by dividing the flange F2 from flowing into the existing fluid pipe P from the communication pipe B. Can be held.

  Since the center of the surface of the plug 7 facing the center drill 10d is formed in the recess 7a toward the communication pipe B, the center drill 10d is plugged by the recess 7a when the flange F2 is cut by the hole saw 10c. By guiding it to the center of 7, the through hole 11 can be accurately formed at the same center as the communication hole 4.

  The communication pipe B supports a long bolt 42 extending along the tube axis direction of the communication pipe B, and the closing member 13 is supported by the long bolt 42 so as to be movable along the long bolt 42. Therefore, when the closing member 13 is inserted into the communication pipe B, the closing member 13 is moved along the long bolt 42 to resist the fluid pressure of the fluid flowing in the existing fluid pipe P. 13 can be accurately inserted into the communication pipe B.

  Although the embodiments of the present invention have been described with reference to the drawings, the specific configuration is not limited to these embodiments, and modifications and additions within the scope of the present invention are included in the present invention. It is.

  For example, in the above embodiment, the fluid in the fluid pipe is clean water, but the fluid flowing in the fluid pipe is not necessarily limited to clean water, and may be, for example, industrial water, or a gas or gas-liquid mixed state It may be a fluid pipe through which the fluid flows.

  Moreover, in the said Example, when the center drill 10d is formed in a diameter smaller than the communicating hole 4, and the flange F2 is drilled by the hole saw 10c, the plug 7 screwed into the communicating hole 4 is drilled by the center drill 10d. At the same time, the section 21 is held by the locking piece 10e. If the center drill has a larger diameter than the communication hole, the center drill drills the communication hole with a larger diameter without screwing the plug into the communication hole. The section may be held by the locking piece 10e.

2 Valve housing portion 2a Valve body 3 Mounting member 4 Communication hole 7 Plug 7a Recess 10c Hole saw (cutting member)
10d Center drill (cutting member)
10e Locking piece (locking part)
11 Through-hole 13 Closing member 13a Water blocking rubber 42 Long bolt (shaft member)
AV1, AV2 Air valve (connecting member)
B Communication pipe F1 flange (Communication pipe flange)
F2 flange (connecting member side flange)
P Existing fluid pipe S, T Opposite surface

Claims (5)

The opposing surfaces of the communication pipe side flange of the communication pipe communicating with the existing fluid pipe and the connection member side flange communicating with the connection member are spaced apart, the valve body is inserted to seal the communication pipe, and the communication pipe is closed. A connecting member detaching method for inserting a blocking member into the communication pipe and detaching the connecting member in an uninterrupted flow state,
The connection member is connected to a communication hole that penetrates the blocking member at a diameter at which the connection member side flange cannot be inserted;
Removing the connection member from the communication hole after inserting the valve body between opposing surfaces of the communication pipe side flange and the connection member side flange, and cutting the periphery of the communication hole in the connection member side flange. A step of forming a through-hole having a diameter into which the blocking member can be inserted, a step of inserting the blocking member into the through-hole and blocking the inside of the communication pipe by the blocking member, and a new one in the communication pipe-side flange And a step of connecting the connection member.   The cutting member for cutting the flange on the connection member side includes a hole saw that forms the through hole and a center drill that protrudes from the center of the hole saw in the tube axis direction of the communication pipe. 2. The method for attaching and detaching a connecting member according to claim 1, wherein the hole saw is positioned using a hole.   The communication hole is provided with a plug for positioning the hole saw after the connection member is removed, and the center drill is configured to collect the plug of the connection member side flange cut by the hole saw. The connecting member detaching method according to claim 2, further comprising a locking portion that locks the connecting member.   The method of attaching or detaching a connecting member according to claim 3, wherein the center of the surface of the plug facing the center drill is formed as a recess toward the communication pipe side.   A shaft member extending along the tube axis direction of the communication tube is supported by the communication tube, and the closing member is supported by the shaft member so as to be movable along the shaft member. The method for attaching and detaching a connecting member according to any one of claims 1 to 4.

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