JP4653571B2 - Flow line blocking method and pipe flow blocking apparatus for fluid piping system - Google Patents

Description

  In the present invention, among the constituent members of a fluid piping system such as a water pipe system, the connecting flange portions of both pipe portions are tightened and connected with a fastener with a sealing material interposed between their joint surfaces. The present invention relates to a flow path blocking method for blocking a flow path for replacement of a repair valve, a fire hydrant, an air valve, and the like located downstream of the flange joint, and an improvement in a pipe flow path blocking device used therefor.

  In a conventional fluid piping system flow path blocking method, for example, leakage or failure due to deterioration of a repair valve, a fire hydrant, etc., connected to the downstream pipe part of the flange joint or constituting the downstream pipe part itself occurs. When it is necessary to replace with a new repair valve, a fire hydrant, etc., as shown in FIGS. 14 and 15, stainless steel that can be applied to the outer pipe of the upstream pipe portion 2 from the outside in the radial direction. A pair of made holding bands 100 and a band 103 made up of drawing bolts 101 and nuts 102 that draw and fix the ends of both holding bands 100 to the holding side are attached.

  Each of the drawing bolts 101 of the band 103 has a notch formed at both ends in the longitudinal direction of a thin plate-like partition plate valve (water stop plate) 104 that can shut off the flow paths of the pipe portions 2 and 3. A temporary fixing bolt 106 screwed with a nut 105 that can be engaged with the mating recess 104a is attached so as to freely swing up and down, and the lower surface of the partition plate valve 104 is connected to the upstream pipe portion 2. An L-shaped locking piece 107 that is engaged with the flange portion 2A from the radially outer side is fixed.

  Next, among the four sets of fastening bolts 109 and nuts 110 constituting the fastener 108 for fastening and connecting the connecting flange portions 2A and 3A of the pipe portions 2 and 3, the partition plate valve 104 is in the insertion movement path. The two sets of fastening bolts 109 and nuts 110 on one center line located at the center are removed, and the two sets of fastening bolts 109 and nuts 110 on the other center line perpendicular to the insertion direction of the partition plate valve 104 are gradually loosened. While operating, the partition plate valve 104 was inserted between the connecting flange portion 2A of the upstream pipe portion 2 and the plate packing 111 which is an example of the sealing material interposed between the joining surfaces, and then inserted. Both temporary fixing bolts 106 of the band 103 are engaged with both engaging recesses 104a of the partition plate valve 104, and a nut 105 screwed into the band 103 is screwed to the tightening side, so that the upstream pipe portion 2 By forming a flange portion 2A in abutting fixed gate plate valve 104 to stop water.

  Next, the two sets of fastening bolts 109 and nuts 110 on the other center line are also removed, the old plate packing 111 and the repair valve are removed, the new plate packing 111 and the repair valve are mounted, and the two sets on the other center line are installed. The fastening bolt 109 and the nut 110 are attached in a temporarily fixed state, and both the temporary fixing bolts 106 are extracted from the both engaging recesses 104 a of the partition plate valve 104.

  In this state, the partition valve 104 is pulled out while adjusting so that the plate packing 111 is not displaced, and then two sets of fastening bolts 109 and nuts 110 on the other center line are finally tightened, and two sets on one center line are set. The fastening bolt 109 and the nut 110 are attached and finally tightened (see Non-Patent Document 1).

The 45th National Waterworks Research Conference May 1994 (5-34) Replacing Fire Hydrant with Unrestricted Water

  In the conventional fluid piping system flow path blocking method, not only the repair valve can be replaced in an uninterrupted water state, but also the connecting flange portions 2A and 3A of both pipe portions 2 and 3 are tightened and connected. Of the bolts 109 and nuts 110, after removing the fastening bolts 109 and nuts 110 located in the insertion path of the partition plate valve 104, the other fastening bolts 109 and nuts 110 are loosened, and the loosening operation is performed. By inserting the partition plate valve 104 through the gap between the generated connecting flange portions 2A and 3A, the flow path in the pipe can be shut off, so that the construction cost can be reduced and the construction period can be shortened. On the other hand, at the moment when the fastening bolt 109 and the nut 110 are loosened, the fluid in the pipe is ejected to the outside through the gap formed between the two connecting flange portions 2A and 3A. Not Rubakari, jetting fluid becomes pledged resistance of the partition plate valve 104, moreover, the two joining flange portions 2A, it is necessary to reduce the gap between 3A utmost easily it took much time to pledge operation of the partition plate valve 104.

  In particular, the plate packing 111 interposed between the joint surfaces of the two connecting flange portions 2A and 3A undulates, or a part of the plate packing 111 is stuck between the joint surfaces of the two connecting flange portions 2A and 3A. In such a case, the partition plate valve 104 is inserted while part of the plate packing 111 is pushed, so that the total amount of fluid in the pipe until the pipe flow path is shut off increases.

  The present invention has been made in view of the above-described actual situation, and the main problem is that the flow path blocking operation between the joint surfaces of both connecting flange portions is performed with less labor while suppressing leakage of fluid in the pipe. A method for shutting off the flow path of the fluid piping system, which can be performed efficiently and reliably and easily, and the gap dimension between both connecting flange portions can be adjusted to the highest shut-off workability according to various conditions, and in the pipe It is in providing a flow path blocking device.

According to the first characteristic configuration of the present invention, in the fluid piping system, both connecting flange portions extend over both pipe portions that are fastened and connected by a fastener in a state in which a sealing material is interposed between joint surfaces of both connecting flange portions. The fastening operation means for loosely operating the fastener from the outside, which can be hermetically sealed as a whole, and entering and moving from the outside in the radial direction with respect to the gap between the connecting flange portions, thereby allowing the fastener to be loosened. A gap forming means that pushes between the two connecting flange portions within the range of the above, and the gap forming means by contacting the outer surfaces of the two connecting flange portions in a pressed state from a direction parallel to the axis of the two pipe portions. the tip and the adjusting bolt for adjusting the mounting position to match the adjacent between the center position of the two joining flange portions, for connecting or disconnecting operation freely flow path blocking through between joint surfaces of the two joining flange portions lamellar Fitted with a shutoff operation cases and Setsuban valve is provided,
By operating the adjustment bolt, the attachment position is adjusted so that the tip of the gap forming means matches the center position between the adjacent portions of the connecting flange parts,
After loosening operate the fastener from outside the fastening operation means,
By operating the gap forming means, the tip of the gap forming means facing the central position between the adjacent flange portions is moved radially inward, and both the connections are made within the range of the loosening operation allowance of the fastener. Forcibly spread between the flanges,
By inserting the partition plate valve into the flow path blocking position through the gap between the two connecting flange portions, the flow path is blocked between the two connecting flange portions.

  According to the above characteristic configuration, for example, leakage or failure due to deterioration of a repair valve, a fire hydrant, etc. connected to the downstream pipe part of the flange joint portion of both pipe parts or constituting the downstream pipe part itself has occurred. When it is necessary to replace the valve with a new repair valve, fire hydrant, etc., install a shut-off work case over both pipe parts, seal the entire connection flange part in a sealed state, and then tighten and connect the connection flange parts of both pipe parts The fastening tool is loosened from the outside by the fastening operation means of the shut-off work case. Although the fluid that has flowed out from the gap between the two connecting flange portions with this loosening operation fills the blocking work case, it does not leak to the outside or the amount of fluid leakage to the outside can be greatly reduced. .

  Therefore, even if the gap between both connecting flange portions is sufficiently larger than the plate thickness of the partition plate valve, the fastener can be freely operated on the tightening side as needed after the partition plate valve is inserted. In addition, when the fluid is filled in the shut-off work case, the pressure in the pipe line is substantially equal to the pressure in the pipe line. Therefore, the thin partition valve provided in the shut-off work case is passed through the gap between the connecting flange portions. Insertion operation can be performed smoothly and reliably up to the flow path blocking position.

  Furthermore, since both the connecting flange portions are enclosed in a sealed state, for example, the gap dimension between both connecting flange portions is smaller than that in the case where only the outer peripheral surfaces of both connecting flange portions are enclosed in a sealed state. It is not limited within the thickness of the part, and the gap size can be adjusted in a wide range according to the thickness of the sealing material, the partition plate valve, or the like or the operation state of inserting the partition plate valve.

  Therefore, unlike the conventional method, it is not necessary to insert and operate the partition plate valve against the pressure of the fluid ejected to the outside from the gap between the joint surfaces of both connection flange portions, and between the joint surfaces of both connection flange portions. The flow path blocking work can be performed efficiently, reliably and easily with little effort while suppressing leakage of fluid in the pipe, and the gap between the connecting flanges is also the highest in blocking work performance according to various conditions. The state can be set freely.

Furthermore, even if the fasteners that tighten and connect the connecting flange portions of both pipe portions are loosened, no gap corresponding to the loosening operation allowance is generated between the connecting flange portions, or the range of the loosening operation allowance Even if the connecting flange portion of the upstream pipe portion tilts with respect to the connecting flange portion of the downstream pipe portion, the clearance forming means provided in the shut-off work case does not exceed the range of the loosening operation allowance of the fastener. By forcibly expanding the space between the two connecting flange portions, a clearance corresponding to the loosening operation allowance can be reliably and substantially formed in the circumferential direction between the two connecting flange portions. The shut-off work case is used to surround both the connecting flanges in a sealed state, but the partition valve provided in the shut-off work case is securely and smoothly passed through the gap between the two connecting flanges to the flow path shut-off position. They are possible to operate plug in's.

According to a second characteristic configuration of the present invention, the gap forming means includes a plurality of tapered surfaces that enter and move from the radially outer side with respect to the gap between the connecting flange portions at a plurality of locations in the circumferential direction of the blocking work case. The separation bolt is screwed to move the taper surface of the separation bolt facing the central position between the adjacent connecting flange portions radially inward to loosen the fastener. It is in the point which forcibly expands between both connection flange parts within the range of the allowance.

The third characteristic configuration according to the present invention is that both the connecting flange portions are entirely connected to both pipe portions that are fastened and connected by a fastener in a state where a sealing material is interposed between the joint surfaces of the both connecting flange portions. In a pipe work case that can be mounted in a sealed surrounding state, a fastening operation means for loosening the fastener from the outside, and a gap between both connecting flange portions generated by the loosening operation of the fastener by the fastening operation means. An in- pipe flow path shut-off device provided with a thin plate-like partition plate valve that can be inserted and moved to a position for shutting off the flow path, and valve operating means for switching the partition plate valve between a flow path shut-off position and a flow path open position In
The shut-off work case has a gap forming means that pushes between the connecting flange portions within the range of the loosening operation allowance of the fastener by entering and moving from the outside in the radial direction with respect to the gap between the connecting flange portions. Provided,
The blocking work case is brought into contact with the outer side surfaces of both connecting flange portions in a pressed state from a direction parallel to the axis of both tube portions, so that the tip of the gap forming means is adjacent to both connecting flange portions. There is an adjustment bolt that adjusts the mounting position so as to match the center position .

  According to the above characteristic configuration, for example, leakage or failure due to deterioration of a repair valve, a fire hydrant, etc. connected to the downstream pipe part of the flange joint portion of both pipe parts or constituting the downstream pipe part itself has occurred. When it is necessary to replace the valve with a new repair valve, fire hydrant, etc., install a shut-off work case over both pipe parts, seal the entire connection flange part in a sealed state, and then tighten and connect the connection flange parts of both pipe parts The fastening tool is loosened from the outside by the fastening operation means of the shut-off work case. Although the fluid that has flowed out from the gap between the two connecting flange portions with this loosening operation fills the blocking work case, it does not leak to the outside or the amount of fluid leakage to the outside can be greatly reduced. .

  Therefore, even if the gap between both connecting flange portions is sufficiently larger than the plate thickness of the partition plate valve, the fastener can be freely operated on the tightening side as needed after the partition plate valve is inserted. In addition, when the fluid is filled in the shut-off work case, it is substantially equal to the internal pressure of the pipe line. Therefore, the valve operating means provided in the shut-off work case allows the thin partition valve to be connected to both connecting flanges. The insertion operation can be performed reliably and smoothly through the gap between the parts to the flow path blocking position.

  Furthermore, since both the connecting flange portions are enclosed in a sealed state, for example, the gap dimension between both connecting flange portions is smaller than that in the case where only the outer peripheral surfaces of both connecting flange portions are enclosed in a sealed state. The gap dimension between both connecting flanges is adjusted within a wide range according to the thickness of the sealing material, the partition plate valve, etc., or the operation status of inserting the partition plate valve, etc. be able to.

  Therefore, unlike the conventional method, it is not necessary to insert and operate the partition plate valve against the pressure of the fluid ejected to the outside from the gap between the joint surfaces of the two connecting flange portions, and the partition plate valve is allowed to flow in a sealed state. Since it is possible to smoothly switch between the channel blocking position and the channel opening position, the channel blocking work between the joint surfaces of both connecting flanges can be performed efficiently and reliably with less effort while suppressing leakage of fluid in the pipe. Further, the gap dimension between the two connecting flange portions can be freely set to a state with the highest shut-off workability according to various conditions.

Furthermore, even if the fasteners that tighten and connect the connecting flange portions of both pipe portions are loosened, no gap corresponding to the loosening operation allowance is generated between the connecting flange portions, or the range of the loosening operation allowance Even if the connecting flange portion of the upstream pipe portion tilts with respect to the connecting flange portion of the downstream pipe portion, the clearance forming means provided in the shut-off work case does not exceed the range of the loosening operation allowance of the fastener. By forcibly expanding the space between the two connecting flange portions, a clearance corresponding to the loosening operation allowance can be reliably and substantially formed in the circumferential direction between the two connecting flange portions. The shut-off work case is used to surround both the connecting flanges in a sealed state, but the partition valve provided in the shut-off work case is securely and smoothly passed through the gap between the two connecting flanges to the flow path shut-off position. It is possible to operate plug in's.

A fourth characteristic configuration according to the present invention is that a work window that can be seen through from the outside is provided in the blocking work case.

  According to the above-mentioned characteristic configuration, the state of the gap generated by the loosening operation of the fastener, the state of the sealing material, the relationship between the gap and the partition plate valve, etc. can be easily confirmed from the outside through the work window provided in the shut-off work case. Therefore, the flow path blocking work efficiency can be improved by appropriately responding to each situation.

According to a fifth feature of the present invention, there is provided a sealing material interposed between the joint surfaces of the coupling flange portions through the gap between the coupling flange portions generated by the loosening operation of the fastener by the fastening operation means. This is in that a seal correcting means for correcting the posture of the device from the outside is provided.

  According to the above characteristic configuration, when a gap is generated between the two connecting flange portions by the loosening operation of the fastener by the fastening operation means, the sealing material interposed between the joint surfaces of the two connecting flange portions is wavy, Alternatively, even when a part of the sealing material is stuck between the joint surfaces of both the connecting flange portions, the posture of the sealing material can be corrected from the outside by the seal correcting means provided in the shut-off work case. Can be suppressed from being pushed out by the partition plate valve, and the flow path blocking work efficiency can be improved.

A sixth characteristic configuration according to the present invention is that a discharge means capable of discharging the fluid in the blocking work case to the outside is provided in the blocking work case.

  According to the above characteristic configuration, when the partition plate valve is inserted to the flow path blocking position through the gap between the two connecting flange portions generated by the loosening operation of the fastener, the discharge means provided in the blocking work case is operated. If the fluid in the shut-off work case is discharged to the outside, this means that the flow path is reliably shut off by the partition valve, and the fluid continues to be discharged. Means that the flow path is not completely shut off by the partition plate valve, and therefore the fastener is tightened until the fluid discharge stops.

  Therefore, the flow path blocking operation can be performed efficiently and reliably with a simple operation of simply checking the presence or absence of fluid from the discharge pipe.

According to a seventh characteristic configuration of the present invention, the gap forming means includes a plurality of tapered surfaces that enter and move from the outside in the radial direction with respect to the gap between the two connecting flange portions at a plurality of locations in the circumferential direction of the blocking work case. It is in the point comprised from the isolation | separation bolt.

  According to the above-mentioned characteristic configuration, by tightening a plurality of separation bolts provided at a plurality of locations in the circumferential direction of the shut-off work case, the space between both connecting flange portions is expanded within the range of the loosening operation allowance of the fastener, It is possible to equalize the opening width in the circumferential direction of the gap between the two connecting flange portions.

According to an eighth feature of the present invention, the separation bolt of the gap forming means is attached to the shut-off work case in a state where the bolt shaft core is located on or near a plane passing through the moving plane of the partition plate valve. There is in point.

  According to the above characteristic configuration, when a plurality of separation bolts provided at a plurality of locations in the circumferential direction of the shut-off work case are tightened, and the space between both coupling flanges is expanded within the range of the loosening operation allowance of the fastener, The moving plane of the partition plate valve is positioned at or near the center position of the widened gap, and the partition plate valve can be smoothly inserted.

[First Embodiment]
FIG. 1 shows a pipe connection structure in a fluid piping system, and a connecting flange of a branch pipe part 2 as an upstream pipe part integrally formed in the middle of a water pipe 1 made of cast iron pipe, which is an example of a fluid pipe. In the portion 2A, a plurality of sets (in this embodiment, the upstream side connecting flange portion 3A of the connecting pipe 3 as the downstream side pipe portion is provided with a sheet packing 4 as an example of a sealing material interposed between their joint surfaces. 4 sets) are fastened and detachably connected in a sealed state by a first fastener 5 comprising bolts 5A and nuts 5B, and the downstream side connection flange portion 3B of the connection pipe 3 includes a fluid device or a piping material. A second fastening composed of a plurality of sets of bolts 7A and nuts 7B in a state in which the upstream connecting flange portion 6A of the repair valve 6 as an example is interposed between the joint surfaces thereof with the seat packing 4 as an example of a sealing material Removable in a sealed state with tool 7 Is clamping connected, furthermore, to the downstream joining flange portion 6B of the repair valve 6, fire hydrants or the like is an example of a fluid apparatus or piping material optionally is detachably fastened connected sealingly.

  And in the part spanning the branch pipe part 2 and the connecting pipe 3, repair is performed for reasons such as water leakage or failure due to deterioration while maintaining the flow of clean water (an example of fluid) in the water pipe 1 while maintaining the flow of water. When it is necessary to replace the valve 6, the branch shaft orthogonal to the tube axis X <b> 1 of the water pipe 1 between the connection flange portion 2 </ b> A of the branch tube portion 2 and the upstream connection flange portion 3 </ b> A of the connection tube 3. An in-pipe flow path blocking device A that blocks the in-pipe flow path W in the direction of the core X2 is assembled.

  As shown in FIGS. 1 to 7, the in-pipe flow path interrupting device A covers both the outer peripheral surface of the branch pipe portion 2 and the outer peripheral surface of the connecting tube 3 so that the entire connecting flange portions 2A and 3A are hermetically sealed. Of the cutting work case B that can be detachably mounted in the state of being engaged, the fastening operation means E for loosening the bolt 5A / nut 5B of the first fastener 5 from the outside, and the bolt 5A / nut 5B of the first fastener 5 A thin plate-like partition plate valve 8 which can be inserted and moved to a position where the pipe flow path W is cut off through the gap S between the joint surfaces of the two connecting flange portions 2A and 3A generated by the loosening operation, and the partition plate valve 8 are sealed. A valve operating means C for switching between a flow path blocking position and a flow path opening operation position in the state is provided as a main component. Further, the blocking work case B includes a loosening operation of the bolt 5A and nut 5B of the first fastener 5. Within the range of Gap forming means D that pushes between the joint surfaces of the two parts 2A, 3A, a work window 9 that can be seen through from the outside, and both connecting flange parts 2A that are generated by the loosening operation of the first fastener 5 by the fastening operation means E, The seal correction means F for correcting the posture of the sheet packing 4 interposed between the joint surfaces of the two connecting flange portions 2A and 3A through the gap S between 3A and the operation for discharging the clean water in the blocking work case B to the outside Possible discharge means G are provided.

  The first fastener 5 includes a plurality of bolts 5C and 5D having a normal specification (four sets in the embodiment) and a plurality of bolts having a special specification (four sets in the embodiment) having an excellent detent function. 5A and nut 5B, that is, a T-head bolt 5A provided with a rotation-preventing piece 17 that contacts the outer peripheral surface of the branch pipe portion 2, and a square nut 5B in which the outer peripheral surface has a quadrilateral contour shape are formed. At the beginning of the replacement work, the normal specification bolts 5C and 5D are replaced with the special specification T-head bolt 5A and square nut 5B, and at the end of the replacement work, the special specification T-head bolt 5A and square nut 5B are replaced with the normal specification. Replace with bolts 5C and 5D.

  As shown in FIGS. 1 to 6, the shut-off work case B surrounds the entire connecting flange portions 2 </ b> A and 3 </ b> A so as to surround the outer peripheral surface of the branch pipe portion 2 and the outer peripheral surface of the connecting tube 3 in a jacket state. It is comprised from the two division | segmentation work cases 11 and 12 fixedly connected so that attachment or detachment is possible along a direction (circumferential direction). Connecting flange portions 11A, 12A for fixing and connecting adjacent members with bolts 13 are integrally formed to project outward in the pipe radial direction, and the inner peripheral surfaces of the divided work cases 11, 12 In each of the seal grooves 11B and 12B formed in each of the first and second parts, there is a space between the inner peripheral surface of each divided work case 11, 12 and the outer peripheral surface of the branch pipe portion 2 and the outer peripheral surface of the connecting pipe 3, and the divided work case 11, Seal between 12 joint surfaces Synthetic rubber elastic sealing member 14 for are fitted and held.

  One split work case 11 is sealed with a valve storage case portion 16 having a storage space 15 in which a partition plate valve 8 at a flow path opening position extracted from between the joint surfaces of both the connecting flange portions 2A and 3A can be stored. It is fixed in a state.

  As shown in FIGS. 1 to 6, the fastening operation means E is provided on the top plate portions 11 </ b> D and 12 </ b> D of the divided work cases 11 and 12 with respect to the square nut 5 </ b> B of the first fastener 5. The operation shaft 18 having a U-shaped fitting mounting portion 18A that is fitted in a non-rotating state from the joining direction of, 12 is supported in a penetrating manner so as to be rotatable around an axis parallel to the branch axis X2. Further, the leakage of clean water that has flowed into the blocking work case B is prevented between the outer peripheral surface of the operation shaft 18 and the inner peripheral surface of the shaft mounting hole formed through the top plate portions 11D and 12D. An O-ring 19 that is an example of a sealing material is provided.

  The protruding shaft portion 18B of the operation shaft 18 is configured as a square shaft portion that can be rotated with a rotary tool such as a wrench, and the fitting mounting portion 18A of the operation shaft 18 and the inner surfaces of the top plate portions 11D and 12D. An operation space that allows a loosening operation of the square nut 5B by the operation shaft 18 is formed between the opposing surfaces.

  As shown in FIGS. 1 to 6, the partition plate valve 8 has a width that is slightly larger than the outer diameters of the branch pipe portion 2 and the connecting pipe 3, and the tip edge 8 a is formed in a semicircular shape. And a semi-circular tip edge 8a at the tip of the valve plate having a sharp edge at the center position in the plate thickness direction. Chamfered into a letter shape.

  As shown in FIGS. 1, 2, 4, and 7, the valve operating means C includes a first screw cylinder 21 fixed to the center position of the rear edge of the partition plate valve 8, and the first screw cylinder. An operation screw shaft 22 screwed into the body 21 and an operation handle 23 fitted and fixed to the rear end portion of the operation screw shaft 22 are arranged. The case 16 has a lid portion 16A that is rotatably supported only by rotation, and an outer peripheral surface of the rear end portion of the operation screw shaft 22 and an inner peripheral surface of a shaft mounting hole that is formed to penetrate the lid portion 16A. An O-ring 19 that is an example of a sealing material that prevents leakage of clean water that has flowed into the shut-off work case B and the valve storage case portion 16 is provided therebetween.

  When the operation handle 23 is rotated in the forward rotation direction, the partition plate valve 8 at the channel opening operation position is fastened by screwing between the operation screw shaft 22 and the first screw cylinder 21 of the partition plate valve 8. When the operation means E is moved to the flow path blocking position through the gap S between the two connecting flange portions 2A and 3A generated by the loosening operation of the first fastener 5 by the operation means E, and the operation handle 23 is rotated in the reverse direction, the operation screw By the screwing of the shaft 22 and the first screw cylinder 21 of the partition plate valve 8, the partition plate valve 8 at the flow passage blocking position passes through the connection flange portions 2 </ b> A and 3 </ b> A to open the flow passage in the valve storage case portion 16. Move to the operating position.

  As shown in FIG. 1 to FIG. 6, the gap forming means D is configured to intersect at an angle of 45 degrees with respect to the valve center line Y of the partition plate valve 8 among the two split work cases 11 and 12. A second threaded cylinder 26 having a female threaded portion that is screwed into a male threaded portion of the separation bolt 25 is fixed to a portion located on the crossing line of By joining the adjacent flanges 2A and 3A from the outside in the radial direction, the joint flanges 2A and 3A are joined within the range of the loosening operation allowance of the bolts 5A and nuts 5B of the first fastener 5. A tapered surface 25a is formed to spread between the surfaces.

  Further, as shown in FIGS. 3 and 4, each of the separating bolts 25 is divided into the two split work cases 11, in a state where the bolt shaft core is located on or near the plane passing through the moving plane of the partition valve 8. 12 is screwed and attached to the second screw cylinder body 26, and the rear end portion of each separation bolt 25 is operated to be screwed with an operating tool such as a wrench from the outside of the second screw cylinder body 26. An engagement hole 25 b is formed, and an O-ring 19 is provided on the inner peripheral surface of each second screw cylinder 26 to seal the space between the outer peripheral surfaces of the separation bolts 25.

  Further, of the top plate portions 11D and 12D and the bottom plate portions 11C and 12C of the divided work cases 11 and 12, two positions located on the valve center line Y of the partition plate valve 8 are female along the direction of the branch axis X2. A third screw cylinder 27 having a threaded portion is fixed, and the third screw cylinder 27 abuts against the outer surface of both the connecting flange portions 3A and 2A in a pressed state from a direction parallel to the branch axis X2. Thus, the adjusting bolt 28 for adjusting the mounting position is screwed so that the tip end portion of the separating bolt 25 matches the center position between the adjacent connecting flange portions 2A and 3A.

  In addition, an operation engagement hole 28a is formed at the rear end of each adjustment bolt 28 from the outside of the third screw cylinder 27 with an operation tool such as a wrench. On the inner peripheral surface of the body 27, an O-ring 19 that seals between the outer peripheral surfaces of the adjusting bolts 28 is provided.

  As shown in FIGS. 1, 2, and 4, the work window 9 is the other of the two divided work cases 11 and 12 that intersects the valve center line Y of the partition plate valve 8 at an angle of 45 degrees. A window cylinder 9A that opens radially outward is integrally formed at a portion located on the intersection line, and the opening of the window cylinder 9A is seen through from the outside such as acrylic resin or polycarbonate resin. A possible transparent plate 9B is tightened and fixed with bolts 24 in a sealed state.

  As shown in FIGS. 1, 2, 4, and 7, the seal correction means F is provided in a portion of the divided work case 12 of the blocking work case B that is substantially opposite to the tip edge 8 a of the partition valve 8. An operation cylinder 32 that opens radially outward is integrally formed, and a spherical surface is formed between the opening of the operation cylinder 32 and the lid member 33 that is fastened and fixed thereto by a bolt 31. And a spherical bearing member 34 that is freely rotatable, and a clearance S between the connecting flange portions 2A and 3A generated by the loosening operation of the first fastener 5 is inserted into the bearing hole 34a of the spherical bearing member 34. A straightening operation shaft 35 having a straightening plate 36 for correcting the posture of the sheet packing 4 interposed between the joint surfaces of the two connecting flange portions 2A and 3A from the outside swings in a three-dimensional direction along the spherical surface. Operation and shaft of bearing hole 34a It is pushed or pulled freely through the supporting direction.

  The seal mounting groove 39 having a substantially triangular cross section formed between the inner peripheral surface of the operation cylinder 32 and the inner peripheral surface of the lid member 33 and the spherical outer peripheral surface of the spherical bearing member 34 includes three members. An O-ring 19 that seals between the opposing surfaces of 32, 33, and 34 is mounted, and a spherical bearing member is provided in seal mounting grooves 40 formed on both sides in the axial direction of the inner peripheral surface of the spherical bearing member 34. An O-ring 19 that seals between the inner peripheral surface of 34 and the outer peripheral surface of the correction operation shaft 35 is mounted, and further, female screw portions formed at both axial ends of the inner peripheral surface of the spherical bearing member 34 A plug body 41 that prevents the O-ring 19 from coming out is screwed.

  When the gap S is generated between the two connecting flange portions 2A and 3A by the loosening operation of the first fastener 5 by the fastening operation means E, the seat interposed between the joint surfaces of the two connecting flange portions 2A and 3A. Even when the packing 4 is wavy or a part of the sheet packing 4 is stuck between the joint surfaces of the two connecting flange portions 2A and 3A, the seal is kept while visually checking through the transparent plate 9B of the work window 9. By swinging the correction operation shaft 35 of the correction means F in a three-dimensional direction along the spherical surface or pushing and pulling the correction operation shaft 35 in the axial direction of the bearing hole 34a, the posture of the attached seat packing 4 is externally applied. Since it can be easily corrected, it is possible to prevent a part of the seat packing 4 from being pushed by the partition plate valve 8 or the partition plate valve 8 that has been pushed in forcefully from being bitten. Can be can be, improved passage interrupting work efficiency.

As shown in FIG. 4, the discharge means G is configured by providing a cock 38 having an opening / closing operation lever 38 </ b> A in the middle of a drain pipe 37 connected to the division work case 11 of the shut-off work case B.
When the partition plate valve 8 is inserted to the flow path blocking position through the gap S between the two connecting flange portions 2A and 3A generated by the loosening operation of the first fastener 5, the discharge provided in the blocking work case B is performed. By opening the cock 38 of the means G and discharging the clean water in the shut-off work case B to the outside, if the drainage of this clean water stops, the flow path W in the pipe is reliably blocked by the partition plate valve 8. If the discharge of clean water continues, it means that the shutoff of the pipe flow path W by the partition valve 8 has not been completed. The first fastener 5 is tightened by means E.

Next, a flow path blocking method for a fluid piping system using the in-pipe flow path blocking apparatus A configured as described above will be described.
First, a plurality of bolts 5C and 5D (refer to FIG. 1) of the normal specification of the first fastener 5 that tightens and connects the connecting flange portion 2A of the branch pipe portion 2 and the connecting flange portion 3A of the connecting tube 3 Replace with the non-rotating bolt 5A and nut 5B in one or two sets.

  As shown in FIGS. 1 to 3, the divided work cases 11 and 12 constituting the blocking work case B are connected to the outer peripheral surface of the branch pipe portion 2 and the outer peripheral surface of the connection tube 3, and the entire connection flange portions 2 </ b> A and 3 </ b> A are Tighten and fix with bolts 13 while surrounding. At this time, the inner peripheral surface of each divided work case 11, 12, the outer peripheral surface of the branch pipe portion 2, and the outer peripheral surface of the connecting pipe 3 are formed by the elastic sealing material 14 mounted in the seal grooves 11 </ b> B, 12 </ b> B of the divided work cases 11, 12. And between the joint surfaces of the divided work cases 11 and 12 are sealed.

  In this state, the partition plate valve 8 stands by at the flow path opening operation position in the valve storage case portion 16, and among the top plate portions 11D, 12D and the bottom plate portions 11C, 12C of the divided work cases 11, 12. The third screw cylinder 27 provided at two locations on the valve center line Y of the partition valve 8 is pressed from the direction parallel to the branch axis X2 on the outer surface of both the connecting flange portions 3A and 2A. The mounting position is adjusted so that the adjusting bolt 28 that is in contact with each other is screwed so that the tip of each separation bolt 25 matches the center position between the adjacent connecting flange portions 2A and 3A.

  Further, when the divided work cases 11 and 12 are joined together, the fitting mounting portions 18A of the respective operation shafts 18 constituting the fastening operation means E are fitted to the square nuts 5B of the first fastener 5 in a non-rotating state. In addition, the anti-rotation piece 17 provided on the T-head bolt 5A is configured to abut against the outer peripheral surface of the branch pipe portion 2 in the initial operation of the rotation operation of the operation shaft 18 to prevent co-rotation. ing.

  Next, as shown in FIG. 5, the projecting shaft portions 18B of the operation shafts 18 of the fastening operation means E are operated with a rotary tool such as a wrench, so that the T-head bolt 5A and the square nut 5B of the first fastener 5 are provided. Is loosened by a dimension corresponding to the set gap S, and a gap S in which the partition plate valve 8 can enter with a slight margin appears between the joint surfaces of the two connecting flange portions 2A and 3A. At this time, while visually confirming through the transparent plate 9B of the work window 9, the operation engagement hole 25b formed in the rear end portion (radially outward end portion) of each separation bolt 25 is rotated with a rotary tool such as a wrench. By rotating, the taper surface 25a of each separation bolt 25 facing the center position between the two connecting flange portions 2A, 3A is screwed and moved radially inward, and within the range of the loosening operation allowance of the first fastener 5 To forcibly spread between the two connecting flange portions 2A and 3A.

  Therefore, even if the first fastener 5 that has tightened and connected the connecting flange portions 2A and 3A is loosened, a gap S corresponding to the loosening operation allowance is not formed between the two connecting flange portions 2A and 3A. Alternatively, even if the upstream side connecting flange portion 3A of the connecting pipe 3 tilts with respect to the connecting flange portion 2A of the branch pipe portion 2 within the range of accommodation existing at the flange joint location, the cutting work case B has a plurality of locations in the circumferential direction. The separation bolt 25 is provided to forcibly spread between the two connecting flange portions 2A and 3A within the range of the loosening operation allowance of the first fastener 5, thereby loosening the two connecting flange portions 2A and 3A. Since the set gap S corresponding to the cost can be reliably formed and the opening width in the circumferential direction of the set gap S can be equalized, the blocking attached to the branch pipe portion 2 and the connecting pipe 3 Work case Although the outer periphery of both connection flange parts 2A and 3A is enclosed by B in a sealed state, the thin plate-like valve plate 8A of the partition valve 8 provided in the shutoff work case B is joined to the connection surfaces of both connection flange parts 2A and 3A. The insertion operation can be performed reliably and smoothly through the set gap S to the flow path blocking position.

  In addition, at this time, the sheet packing 4 interposed between the joint surfaces of the two connecting flange portions 2A and 3A is wavy, or a part of the sheet packing 4 extends between the joint surfaces of the two connecting flange portions 2A and 3A. Even if the sticking is attached, the correction operation shaft 35 of the seal correction means F is swung in a three-dimensional direction along the spherical surface while visually confirming through the transparent plate 9B of the work window 9 or the shaft of the bearing hole 34a. By pushing and pulling in the core direction, the posture of the stuck sheet packing 4 can be easily corrected from the outside.

  When the T-head bolt 5A and the square nut 5B of the first fastener 5 are loosened by a dimension corresponding to the set gap S, a gap S corresponding to the loosening operation allowance is provided between the connecting flange portions 2A and 3A. When it can be visually confirmed through the transparent plate 9B of the work window 9 that the plate is uniformly and reliably formed in the direction, both the thin plate-like valve plates 8A of the partition valve 8 are not operated without operating the separation bolts 25. The insertion operation may be performed up to the flow path blocking position through the set gap S between the joint surfaces of the connecting flange portions 2A and 3A.

  Then, as shown in FIG. 5, the partition plate valve 8 that has been waiting at the flow path opening operation position in the valve storage case portion 16 by rotating the operation handle 23 of the valve operating means C in the forward rotation direction, After inserting and moving to the flow path blocking position through the set gap S between the joint surfaces of both the connecting flange portions 2A and 3A, as shown in FIG. 6, each separation bolt 25 is screwed to the initial standby position. The first fastener 5 is tightened by the fastening operation means E.

Next, the cock 38 of the discharge means G provided in the shut-off work case B is opened to discharge the clean water in the shut-off work case B to the outside. This means that the pipe flow path W is reliably shut off by the valve 8, and if the drainage of clean water continues, it means that the shutoff of the pipe flow path W by the partition plate valve 8 has not been completed. Therefore, the first fastener 5 is tightened by the fastening operation means E until the discharge of clean water stops.
Thereby, between the connection flange part 2A of the branch pipe part 2 and the upstream connection flange part 3A of the connection pipe 3, the in-pipe flow path in the direction of the branch axis X2 orthogonal to the pipe axis X1 of the water pipe 1 W is reliably shut off.

  Next, the seat packing 4, which is an example of a sealing material interposed between the joint surfaces of the connecting flange portion 2 </ b> A of the branch pipe portion 2 and the upstream side connecting flange portion 3 </ b> A of the connecting pipe 3, When it is not damaged or deteriorated by the insertion operation to the road blocking position, the downstream connection flange portion 3B of the connection pipe 3 and the upstream connection of the repair valve 6 in the above-described closed state of the pipe flow path W. The bolts 7A and nuts 7B of the second fastener 7 that are tightened and connected to the flange portion 6A are removed and replaced with new repair valves 6.

  When the replacement of the new repair valve 6 is completed, the operation handle 23 of the valve operating means C is rotated in the reverse rotation direction to pull out and move the partition plate valve 8 at the flow path blocking position to the flow path open position. After the separation bolts 13 provided at a plurality of locations in the circumferential direction of the blocking work case B are loosened to the clearance release position, the bolts 5A and nuts 5B of the first fastener 5 are tightened and the branch pipe portion 2 The connecting flange portion 2A and the upstream side connecting flange portion 3A of the connecting pipe 3 are tightened and connected in a sealed state. Then, after removing the shut-off work case B from the branch pipe portion 2 and the connecting pipe 3, the bolts 5A and nuts 5B of the special specification of the first fastener 5 are used as normal or normal bolts 5C, 5D in one or two sets. Replace with.

  The seat packing 4, which is an example of a sealing material interposed between the joint surfaces of the connecting flange portion 2 </ b> A of the branch pipe portion 2 and the upstream side connecting flange portion 3 </ b> A of the connecting pipe 3, When it is damaged or deteriorated due to the insertion operation to the shut-off position and it is necessary to replace the seat packing 4 with a new one, the repair valve 6 is removed and the work on / off valve 52 is attached. 52, a flow path blocking device H that blocks the flow path W in the branch pipe section 2 as the upstream pipe section through the flow path W in the connection pipe 3 as the downstream pipe section is attached, and the seat packing 4 and the repair valve 6 will be replaced.

  As shown in FIGS. 8 to 13, the flow path blocking device H used in this method includes a connection flange portion 54 </ b> A that can be connected in a sealed state to the downstream connection flange portion 52 </ b> B of the work on / off valve 52. A cylindrical first operating shaft 55 is formed in the bottom wall portion 54B of the bottomed cylindrical lid body 54 so as to slidably pass through the central portion of the bottom wall portion 54B in the axial direction in a sealed state. A second operating shaft 56 that slidably passes through the first operating shaft 55 in the axial direction is provided, and the inner ends of the first operating shaft 55 and the second operating shaft 56 are provided in the branch pipe section 2. Is capable of engaging with a closing means J for blocking the flow path W and a large-diameter pipe wall portion upstream of the shielding portion by the closing means J, that is, the periphery of the branch flow path opening of the water pipe 1 There is provided a retaining means K provided with a pair of locking links 57 and 58 protruding while bending in a diameter-enlarging posture. , Operating means L is provided to operate over both operating shaft 55, 56 a closing means J and the retaining means K from the outside.

Next, the closing means J will be described.
As shown in FIGS. 9-12, the 1st press plate 60 provided with the hollow part 60B opened in concentric circle toward 60 A of annular | circular shaped pressing surfaces and the front end side at the inner end part of the 1st operating shaft 55. FIG. Are fitted and fixed, and on the inner end side of the second operating shaft 56, an annular pressing surface 61A opposite to the pressing surface 60A of the first pressing plate 60 in the axial direction and a hollow portion of the first pressing plate 60. A second pressing plate 61 having a cylindrical portion 61B that is slidably fitted to the shaft 60B from the axial direction is externally fitted so as to be slidable in the axial direction. A stopper nut 62 and a locking nut 63 for setting the maximum moving position of the second pressing plate 61 to the upstream side are screwed into a screw shaft portion 56 a formed on the inner end side of the second operation shaft 56. ing.

  The outer diameter of the first pressing plate 60 and the outer diameter of the second pressing plate 61 are taken in and out of the branch pipe portion 2 of the water pipe 1 from the storage chamber 54C in the lid 54 through the work on-off valve 52 and the connecting pipe 3. The inner diameter of the branch pipe portion 2 and the connecting pipe 3 and the outer diameter smaller than the inner diameter of the flow path 52D in the ball valve body 52C of the work on-off valve 52 are formed so that they can be operated.

  Further, the cylindrical portion 61B of the second pressing plate 61 is formed to have an outer diameter smaller than the inner diameter of the flow path 52D in the ball valve body 52C of the work on-off valve 52 in a non-pressurized state (natural state). In addition, due to the pinching force in the axial direction by the pressing surfaces 60A and 61A of the pressing plates 60 and 61, the inner peripheral wall surface and the inner peripheral wall surface are both elastically deformed into a diameter-expanded state in close contact with the inner peripheral wall surface of the branch pipe portion 2. An elastic body 59 for expanding the diameter of rubber that seals between the outer peripheral portions of the pressing plates 60 and 61 is covered.

  As shown in FIGS. 9 to 12, the central portion in the axial direction of the diameter-enlarging elastic body 59 is configured to have a larger diameter than both ends in the axial direction, and the outer peripheral surface of the large-diameter central portion is The central position in the axial direction is formed on a partially spherical surface that protrudes outward most.

  Also, as shown in FIG. 12, each of the outer peripheral side end surface portion of the pressing surface 60 </ b> A of the first pressing plate 60 and the outer peripheral side end surface portion of the pressing surface 61 </ b> A of the second pressing plate 61 Formed on the annular inclined pressing surface located closer to the center position in the axial direction of the diameter-enlarging elastic body 59 toward the outer side in the radial direction so as to come into close contact with the outer peripheral annular inclined surface 59a on both end surfaces from the axial direction. In addition, the outer peripheral edge of the pressing surface 60A of the first pressing plate 60 and the outer peripheral edge of the pressing surface 61A of the second pressing plate 61 are in contact with the outer peripheral surfaces of both ends in the axial direction of the elastic body 59 for diameter expansion. The annular pressing portions 60C and 61C that are externally fitted in the state are formed.

Next, the retaining means G will be described.
As shown in FIG. 12, plate-like connecting portions 65 to which the end portions of the downstream locking links 58 are pivotally connected at three locations in the circumferential direction on the upstream end surface of the second pressing plate 61 are swingably connected. At the three circumferential positions of the outer peripheral surface of the mounting cylinder 66 that is fixedly attached and slidably fitted to the inner end side screw shaft portion 56 a of the second operation shaft 56, there are upstream locking links 57. A plate-like connecting portion 67 whose end is pivotally connected so as to be swingable is fixed, and a stopper nut for setting the maximum moving position of the mounting cylinder 66 upstream of the second operating shaft 56 is fixed. 68 is screwed to the tip end side of the inner end side screw shaft portion 56 a of the second operation shaft 56.

  And among the connection part 65 of the 2nd press board 61, and the connection part 67 of the attachment cylinder 66, it is respectively set to 3 sets of connection parts 65 and 67 which mutually oppose in an axial direction, and 57 links | 10 to 13, as shown in FIGS. 10 to 13, in conjunction with the sliding of the second operation shaft 56 toward the outer end side with respect to the first operation shaft 55, the shield by the diameter-expanding elastic body 59. 8 and 9 are configured to bend and bend in a diameter-enlarging posture that can be engaged with the inner peripheral wall surface upstream of the location, that is, the peripheral edge of the branch channel opening of the water pipe 1. As shown in FIG. 3, when the pair of locking links 57 and 58 of the retaining means K are extended in the reduced-diameter posture, the outer hip fold where the bent pivot part P2 of the locking links 57 and 58 pair protrudes radially outward. The posture, that is, the bending pivot connection point P2 of the pair of locking links 57 and 58 is Reversal prevention that restricts contact with the outer waist folded posture that protrudes radially outward from the line connecting the pivot connection point P1 to the connection portion 67 and the pivot connection point P3 to the connection portion 65 of the second pressing plate 61. Means M are provided.

  As shown in FIG. 12, the inversion preventing means M is formed on the downstream end of the mounting cylinder 66 on the side of the three upstream locking links 57 extending and swinging radially inward. In contact with each other, a ring-shaped elastic corrector 71 is mounted to receive each upstream side locking link 57 in a setting limit outer waist folded position closest to the line segment.

Next, the operation means L will be described.
As shown in FIGS. 8 to 10, the first operation shaft 55 includes a long operation main body cylinder shaft 55 </ b> A fitted and fixed to the first pressing plate 60 from the axial direction, and the operation main body cylinder shaft. The operation extension cylinder shaft 55B is fitted and fixed to the outer end side of 55A. The inner peripheral surface of the operation extension cylinder shaft 55B is formed as a regular hexagonal different diameter inner peripheral surface.

  The second operation shaft 56 includes a long operation body shaft 56A having an inner end side screw shaft portion 56a and an operation extension shaft 56B screwed and fixed to the outer end side of the operation body shaft 56A. The operation extension shaft 56B includes an outer end side screw shaft portion 56b in which an operation screw member 76 that can be brought into contact with the end portion of the operation extension cylinder shaft 55B of the first operation shaft 55 via a thrust bearing 75 is screwed. A large-diameter angular shaft portion 56c having a regular hexagonal outer peripheral surface that is slidably fitted only in the axial direction in a state in which the first operation shaft 55 is not rotatable relative to the operation extension cylinder shaft 55B is formed. Yes.

  When the operation screw member 76 is screwed to the tightening side, the first operation shaft 55 is pushed and slid to the inner end side with respect to the second operation shaft 56, as shown in FIGS. Due to the clamping action accompanying the proximity movement of the first pressing plate 60 with respect to the two pressing plates 61, the elastic member 59 for expanding the diameter in an uncompressed state is elastically deformed into a diameter expanding state in close contact with the inner peripheral wall surface of the branch pipe portion 2. Then, the flow path W in the branch pipe portion 2 is shielded (blocked) in a sealed state.

  In addition, a pair of first presser operation rods 77 are detachably fitted and held on the operation extension cylinder shaft 55B of the first operation shaft 55, and the first presser operation rods 77 include a second The second presser foot 78 that is detachably fitted to and held by the operation extension shaft 56B of the operation shaft 56 can be freely engaged and disengaged, and in the engaged state, the second operation with respect to the first operation shaft 55 against water pressure. The first locking ring 79 that prevents the shaft 56 from sliding toward the outer end side and the pair of L-shaped locking pieces 80 fixed to the bottom wall portion 54B of the lid body 54 can be freely engaged and disengaged. In the engaged state, a second locking ring 81 is provided that prevents sliding of the first operating shaft 55 to the outer end side with respect to the lid 54 against water pressure.

Next, a method for replacing the seat packing 4 and the repair valve 6 using the flow path blocking device E configured as described above will be described.
[1] As shown in FIG. 8, the bolt 7A of the second fastener 7 that fastens and connects the downstream connection flange portion 3A of the connection pipe 3 and the upstream connection flange portion 6A of the repair valve 6 to be replaced. After loosening the nut 7B and removing the repair valve 6 to be replaced, the upstream connection flange portion 52A of the work on-off valve 52 is connected to the downstream connection flange portion 3A of the connection pipe 3 with the second fastener 7 The bolts 7A and nuts 7B are tightened and connected.

  [2] As shown in FIG. 8, the ball valve body 52C of the work on / off valve 52 is closed, and the partition plate valve 8 at the flow path shut-off position is pulled out to the flow path open position and then moved. The connecting flange portion 54A of the lid 54 of the flow path shutoff device H is tightened and connected to the downstream connecting flange portion 52B of the on-off valve 52 with the bolt 7A and nut 7B of the second fastener 7.

  At this time, with the pair of first locking rings 79 engaged with the second presser operating rod 78, the pair of second locking rings 81 is removed from both the locking pieces 80 of the lid 54, and both the operation shafts 55 are removed. , 56 are moved upward with respect to the lid 54, and the closing means J and the retaining means K are stored in the storage chamber 54C of the lid 54.

  Further, the positional relationship between the operation shafts 55 and 56 in the axial direction is regulated by the first locking rings 79, and in this state, the opposing distance between the pressing plates 60 and 61 is the diameter-enlarging elastic body 59. Is not compressed or set at an interval close thereto, the diameter-enlarging elastic body 59 is maintained in a reduced diameter state.

[3] As shown in FIG. 9, the opening / closing valve 52 for operation is opened, both the operating shafts 55, 56 are pushed and moved downward with respect to the lid body 54, and the pair of second locking rings 81 are closed. Engaging with both locking pieces 80 of the body 54, the two operating shafts 55 and 56 are pushed in and held in the operating position.
At this time, the retaining means G is located in the water pipe 1 having a larger cross-sectional area than the flow path W in the branch pipe portion 2.

  [4] Next, as shown in FIG. 10, the pair of first locking rings 79 are removed from the second presser operation lever 78, and the second presser operation rod 78 is moved from the operation extension shaft 56 </ b> B of the second operation shaft 56. When removed, the second operation shaft 56 is moved to the outer end side (upper side in the figure) with respect to the first operation shaft 55 by the water pressure of the clean water flowing through the water pipe 1 or the water pressure and the artificial pulling operation force. The pair of locking links 57 and 58 which are pivotally connected across the connecting portion 65 of the second pressing plate 61 and the connecting portion 67 of the mounting cylinder 66 are bent in a diameter-enlarging posture in conjunction with the sliding. Overhang.

  In this state, as shown in FIG. 11, both the second locking rings 81 are removed from both locking pieces 80 of the lid 54, and both operations are performed by the tap water pressure or the water pressure and the artificial pulling operation force. When the shafts 55 and 56 are slid upward with respect to the lid 54, the pair of locking links 57 and 58 bent in the diameter-enlarging posture are located on the upstream side of the flow path shielding portion by the diameter-enlarging elastic body 59. The peripheral wall surface, that is, the branch channel opening periphery of the water pipe 1 is engaged.

  [5] As shown in FIGS. 11 and 12, when the operation screw member 76 is artificially screwed to the tightening side, the first operation shaft 55 is moved to the inner end side (lower side of the figure) with respect to the second operation shaft 56. The elastic body 59 for expanding the diameter in the reduced diameter state is formed on the inner peripheral wall surface of the branch pipe portion 2 by the pressing action accompanying the proximity movement of the first pressing plate 60 with respect to the second pressing plate 61. It is elastically deformed into an expanded diameter state in close contact, and the space between the inner peripheral wall surface of the branch pipe portion 2 and the outer peripheral portions of the pressing plates 60 and 61 is shielded in a sealed state.

  [6] Next, as shown in FIGS. 11 and 13, the opening / closing operation lever 83A of the faucet 83 connected to the drain pipe 82 of the lid 54 is opened to discharge water, and the water stoppage is stopped by stopping the water discharge. After confirming the above, after removing the first presser operating lever 77 and the lid 54, the work on-off valve 52 and the connecting pipe 3 are removed from the branch pipe portion 2 of the water pipe 1.

  Thereafter, the upstream flange flange 3A of the connecting pipe 3 is connected to the connecting flange part 2A of the branch pipe part 2 with a plurality of sets of normal bolts 5C, with a new sheet packing 4 interposed between their joint surfaces. After the first fastener 5 made of 5D is detachably tightened and connected in a sealed state, the upstream connection flange portion 6A of the new repair valve 6 is joined to the downstream connection flange portion 3B of the connection pipe 3 In a state where a new sheet packing 4 is interposed between the surfaces, the second fastener 7 including a plurality of sets of bolts 7A and nuts 7B is detachably tightened and connected in a sealed state.

[Second Embodiment]
In the first embodiment described above, the T-head bolt 5A provided with the anti-rotation piece 17 that contacts the outer peripheral surface of the branch pipe portion 2 is used. However, as shown in FIG. 16, the divided work cases 11 and 12 and the bottom plate portion 11C. , 12C protrudes from the inner surface of the connecting flange portions 11A, 12A to the T head of the bolt 5A of the first fastener 5 to fix the connecting flange portions 11A, 12A and prevent the bolt 5A from rotating together. May be implemented.
In addition, since the other structure is the same as the structure demonstrated in 1st Embodiment, the same number is attached to the same structure location as 1st Embodiment, and the description is abbreviate | omitted.

[Other Embodiments]
(1) In the first embodiment described above, the fluid piping system in which the branch pipe portion 2 is integrally formed in the middle of the fluid pipe 1 such as a water pipe has been described, but the fluid pipe 1 is provided along the circumferential direction thereof. And a branch pipe portion 2 that protrudes from the pipe radial direction with respect to a through-hole formed in the fluid pipe 1 in one split joint body. The technique of the present invention may be applied to a fluid piping system in which an existing pipe joint is mounted and an on-off valve is attached to a branch pipe portion of the pipe joint.

(2) Although the blocking work case B is divided into two in the circumferential direction in the first embodiment described above, it may be divided into three or more in the circumferential direction.
In short, any work case B may be used as long as it can be detachably attached to the outer peripheral surfaces of both the pipe portions 2 and 3 in a state of sealingly enclosing each of the connecting flange portions 2A and 3A.

(3) In the first embodiment described above, the gap forming means D moves from the radially outer side into the gap S between the two connecting flange portions 2A, 3A at a plurality of locations in the circumferential direction of the blocking work cover B. However, the present invention is not limited to this configuration. For example, a plurality of wedge members that are urged inward in the radial direction may be provided. Good.
In short, as the gap forming means D, Ru der what can be widened forcibly press the two joining flange portions 2A, between bonding surfaces of 3A within the loosening operation allowance of the first fastener 5.

(4) In the first embodiment described above, the valve operating means C is screwed into the first screw cylinder 21 fixed to the center position of the rear end edge of the partition plate valve 8 and the first screw cylinder 21. The operation screw shaft 22 and the operation handle 23 fitted and fixed to the rear end portion of the operation screw shaft 22 are configured. Although it is configured to switch to the path open position, an operation grip for pushing and pulling is fixed to the partition plate valve 8, and the partition plate valve 8 is manually switched directly between the flow path blocking position and the flow path open position. You may comprise as follows.
In short, as the valve operating means C, any structure may be used as long as the partition plate valve 8 can be switched between the flow path blocking position and the flow path opening position.

  (5) As the seal correction means F, between the joint surfaces of the two connecting flange portions 2A and 3A through the gap S between the two connecting flange portions 2A and 3A generated by the loosening operation of the first fastener 5 by the fastening operation means E. Any structure may be used as long as the posture of the sealing material 4 interposed between the two can be corrected from the outside.

The side view which shows 1st Embodiment of the flow-path blocking method of the fluid piping system by this invention, and mounts | wears with the in-pipe flow-path blocking apparatus. Horizontal sectional view when the pipe flow path shut-off device is installed Partially cut away enlarged side view when the in-pipe channel blocking device is in the channel open state Enlarged horizontal cross-sectional view of the main part when the in-pipe channel blocking device is in the channel open state Partially cutaway enlarged side view when the partition plate valve of the in-pipe channel shut-off device is switched to the channel shut-off position Partially cut away enlarged side view when the first fastener is operated to crimp the partition valve between the joint surfaces of both connecting flanges Enlarged sectional view of the mounting part of the seal correction means Partially cutaway side view when the flow shut-off device is attached to the work on / off valve Partially cutaway side view when the blocking means and retaining means of the flow path blocking device are lowered to the water pipe side Partially cutaway side view when the link pair of retaining means is bent to an expanded posture Partially cutaway side view when the flow path is blocked by an elastic body for expanding the diameter of the closing means Enlarged cross-sectional view of the main part when the flow path is blocked by the diameter-enlarging elastic body of the closing means Partially cutaway side view when the work clamp and connection pipe are removed from the branch pipe section of the water pipe after removing the first presser foot and the lid of the channel blocker Sectional front view of the main part showing a conventional flow path blocking method Cross-sectional plan view of the main part Partially cut away enlarged side view showing a second embodiment of the flow path blocking method of the fluid piping system according to the present invention

Explanation of symbols

A In-pipe flow blocking device B Shut-off work case C Valve operating means D Clearance forming means E Fastening operating means F Seal correcting means G Discharge means S Clearance W In-pipe flow path X1 Pipe axis X2 Branch axis 1 Fluid pipe (water pipe)
2 Branch pipe section (upstream pipe section)
2A Connecting flange part 3 Connecting pipe (downstream pipe part)
3A Connecting flange 4 Sealing material (sheet packing)
5 fasteners (first fasteners)
8 Divider valve 9 Work window 25 Separation bolt 25a Tapered surface
28 Adjustment bolt

Claims (8)

In the fluid piping system, both the connecting flange portions can be hermetically sealed over both pipe portions that are tightened and connected by a fastener with a sealing material interposed between the joint surfaces of both connecting flange portions, and The fastening operation means for loosening the fastener from the outside and the gap between the two connecting flange portions enter and move from the outside in the radial direction, so that between the two connecting flange portions within the range of the loosening operation allowance of the fastener. The gap forming means that spreads and the outer end surfaces of both connecting flange portions are in contact with each other in a pressed state from the direction parallel to the axis of both pipe portions, so that the tip of the gap forming means is adjacent to both connecting flange portions. and adjusting bolt for adjusting the mounting position to match between a central position, blocking the the insertion and removal operation freely flow path laminar partition plate valve for blocking through between joint surfaces of the two joining flange portions are provided The business case is attached,
By operating the adjustment bolt, the attachment position is adjusted so that the tip of the gap forming means matches the center position between the adjacent portions of the connecting flange parts,
After loosening operate the fastener from outside the fastening operation means,
By operating the gap forming means, the tip of the gap forming means facing the central position between the adjacent flange portions is moved radially inward, and both the connections are made within the range of the loosening operation allowance of the fastener. Forcibly spread between the flanges,
Wherein the gate plate valve, by insert to the conduit shutting position through the gap between the two joining flange portions, the flow path blocking method of the fluid piping system, characterized by blocking the flow path between the two joining flange portions. The gap forming means is composed of a plurality of separation bolts having tapered surfaces that enter and move from the outside in the radial direction with respect to the gaps between the connecting flange portions at a plurality of locations in the circumferential direction of the blocking work case. To move the taper surface of the separation bolt facing the center between adjacent flanges to the inner side in the radial direction. The method for shutting off the flow path of the fluid piping system according to claim 1, wherein the channel is forcibly expanded . A shut-off that can be installed in a state of sealingly enclosing both the connecting flange portions of both pipe flange portions that are tightened and connected by a fastener with a sealing material interposed between the joint surfaces of both connecting flange portions. The work case is inserted and moved to a position where the pipe flow path is blocked through a clearance between the fastening operation means for loosening the fastener from the outside and a gap between both connecting flange portions generated by the loosening operation of the fastener by the fastening operation means. In an in-pipe flow path shutoff device provided with a flexible thin plate-like partition plate valve and valve operating means for switching the partition plate valve between a flow path shut-off position and a flow path open position ,
The shut-off work case has a gap forming means that pushes between the connecting flange portions within the range of the loosening operation allowance of the fastener by entering and moving from the outside in the radial direction with respect to the gap between the connecting flange portions. Provided,
The blocking work case is brought into contact with the outer side surfaces of both connecting flange portions in a pressed state from a direction parallel to the axis of both tube portions, so that the tip of the gap forming means is adjacent to both connecting flange portions. An in- pipe flow path blocking device provided with an adjustment bolt that adjusts the mounting position so as to match the center position . The in-pipe flow path blocking device according to claim 3 , wherein the blocking work case is provided with a work window that can be seen through from the outside. The blocking work case has a seal correction that externally corrects the posture of the sealing material interposed between the joint surfaces of the two connecting flange portions through the gap between the two connecting flange portions generated by the loosening operation of the fastener by the fastening operation means. The in-pipe flow path blocking device according to claim 3 or 4 , wherein means are provided. The in-pipe flow path blocking device according to any one of claims 3 to 5 , wherein the blocking work case is provided with a discharging means capable of discharging the fluid in the blocking work case to the outside. The gap forming means is composed of a plurality of separation bolts having tapered surfaces that enter and move from the outside in the radial direction with respect to the gap between the connecting flange portions at a plurality of locations in the circumferential direction of the blocking work case. The pipe | tube flow-path cutoff apparatus of any one of 3-6 . 8. The in-pipe flow path shutoff according to claim 7, wherein the separation bolt of the gap forming means is attached to the shutoff work case in a state where the bolt shaft core is located on or near the plane passing through the moving plane of the partition plate valve. apparatus.

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