JP6262534B2 - Pipe flow path blocking device - Google Patents

Description

  The present invention seals the outer peripheries of both connecting flange portions against both pipe portions that are tightened and connected by a plurality of fasteners arranged in the circumferential direction with a sealing material interposed between the joint surfaces of both connecting flange portions. A shut-off work cover that can be mounted in a state in which the pipe is closed, and the shut-off work cover is sealed through a gap between both connecting flange portions generated by the loosening operation of the fastener, The present invention relates to an in-pipe flow path blocking device provided with a thin plate-like partition plate valve that can be inserted and removed between a flow path open position.

  Such an in-pipe flow path shut-off device includes a flange joint where the connection flange portions of both pipe portions are tightened and connected by a plurality of fasteners in a water pipe system (an example of a fluid piping system). It is used to shut down the pipe flow path for replacement or repair of a repair valve, a fire hydrant, an air valve, etc. located on the downstream side.

  When shutting off the pipe flow path, for example, as shown in Patent Document 1, a shut-off work cover of the pipe flow path shut-off device is attached in a state where the outer periphery of both the connecting flange parts is sealed, and both the connecting flange parts are tightened. A clearance is formed between both connecting flanges by loosening the connecting fasteners. Thereafter, the partition plate valve provided in the blocking work cover is inserted and moved through the gap from the channel opening position to the channel blocking position for blocking the pipe channel, and the partition plate located at the channel blocking position is moved. By tightening and fixing the fastener again in a state where the valve is sandwiched between both connecting flange portions, the flow path in the pipe is blocked.

JP 2006-144824 A

In such an in-pipe flow path shut-off device, a plurality of fasteners for tightening and connecting both connecting flange portions are screwed into a fastening bolt inserted into each of a plurality of through-holes arranged uniformly in the circumferential direction, and each fastening bolt. And a fastening nut. Therefore, when the partition plate valve is inserted and removed between the flow passage blocking position and the flow passage opening position, the fastening bolts are interposed between a pair of fastening bolts adjacent in the circumferential direction among the plurality of fastening bolts. And it is comprised so that the clearance gap between both the connecting flange parts which generate | occur | produced by loosening operation of the fastening nut may be passed.
Therefore, the partition plate valve needs to be configured so that the pipe flow path can be reliably blocked at the flow path blocking position, and can be reliably moved between the pair of fastening bolts when moving in and out.

Here, an in-tube flow path is formed in communication with both pipe portions (both connecting flange portions), and both the connecting flange portions penetrate in the same direction as the in-tube flow path at the outer diameter side portion of the in-tube flow path. A plurality of through-holes are formed, and in the cross-sectional view of both pipe parts (both connecting flange parts), the arrangement relationship between these pipe flow paths and the plurality of through-holes is variously set according to the nominal diameter of both pipe parts. ing.
Therefore, depending on the arrangement relationship, in the insertion movement direction view of the partition plate valve (longitudinal sectional view of both pipe portions (both connecting flange portions)), a pair of the above-described pair of fastening bolts inserted through the plurality of through holes. In some cases, the through hole and the in-pipe flow path are close to each other or partially overlap. In such a case, if the width of the partition plate valve is set to a sufficient width that can reliably block the flow path in the pipe, when the partition plate valve is inserted, the tip and side portions of the partition plate valve are inserted into the pair of through holes. Interfering with a pair of fastening bolts to be inserted, it may be difficult or impossible to insert into the passage blocking position.

  In particular, in a state where the shaft cores of the pair of fastening bolts inserted into the pair of through holes are biased to the side close to either of the pair of fastening bolts with respect to the shaft core of the through hole to be inserted, If the fastening bolt and the fastening nut are screwed together, the distance between the pair of fastening bolts becomes shorter than the expected distance, and interference between the pair of fastening bolts and the partition plate valve is more likely to occur. It becomes even more difficult or impossible to insert the partition valve into the flow path blocking position.

  As described above, when it becomes difficult to insert the partition plate valve, it takes time and labor to insert the work, and when the insertion work becomes impossible, it is necessary to retighten and tighten the fastening bolt again. There is a risk that the work efficiency will decrease and the construction period will increase.

  This invention is made in view of the above-mentioned actual condition, Comprising: It is the point which provides the in-pipe flow-path interruption | blocking apparatus which can perform the insertion / extraction movement of a partition valve efficiently and reliably, although it is a simple structure. is there.

In order to achieve the above object, an in-pipe flow path interrupting device according to the present invention includes a plurality of fasteners arranged in a circumferential direction with a sealant interposed between joint surfaces of both connecting flange portions. A shielding work cover that can be freely mounted in a state in which the outer periphery of both the connecting flange parts is sealed with respect to the pipe part, and a gap between the two connecting flange parts generated by a loosening operation of the fastener is provided in the shielding work cover. In-pipe channel shut-off device equipped with a thin plate-like partition plate valve that can be inserted and removed between a channel shut-off position and a channel open position that shut off the pipe flow channel in a sealed state Is
Each of the plurality of fasteners includes a fastening bolt inserted into each of the plurality of through holes arranged in the circumferential direction in the both connecting flange portions, and a fastening nut screwed into the fastening bolt,
Among the plurality of fastening bolts, interference between the pair of fastening bolts adjacent in the circumferential direction and the partition valve that is inserted and removed through the gap between the connecting flange portions in a state between the pair of fastening bolts is suppressed. It is in the point provided with the interference suppression means.

According to the above characteristic configuration, the shut-off work cover provided with the partition plate valve is attached to the outer periphery of the both connecting flange portions, and the partition plate valve is a pair of adjacent fastening bolts as fasteners in the circumferential direction. By inserting / removing between the flow path open position and the flow path cut-off position through the gap between both coupling flanges generated by loosening operation of the fastening bolt and the fastening nut in the state where the fastening bolts are adjacent to each other, Block or open the flow path. At this time, since the in-pipe flow path blocking device is provided with interference suppression means for suppressing interference between the pair of fastening bolts and the partition plate valve passing between adjacent pairs of the fastening bolts, the partition plate that moves in and out The valve is prevented from interfering with the pair of fastening bolts, and the partition plate valve can be inserted and removed between the flow path opening position and the flow path blocking position efficiently and reliably.
Thereby, for example, in the cross-sectional view of both pipe parts (both connecting flange parts), the arrangement relationship of the flow paths in both pipe parts and the plurality of through holes in both connecting flange parts depends on the nominal diameter of both pipe parts, etc. A pair of through-holes and pipe flow through which a pair of fastening bolts are inserted among a plurality of through-holes as viewed in the direction of insertion movement of the partition valve (both pipe parts (both connecting flange parts)). Even if the width of the partition plate valve is sufficiently wide enough to reliably block the flow path in the pipe when it is close to or partially overlaps with the road, when inserting the partition plate valve, the tip or side portion of the partition plate valve Is prevented from interfering with the pair of fastening bolts inserted through the pair of through holes, and the insertion operation to the flow path blocking position can be performed efficiently and reliably.
In addition, for example, each shaft core of the pair of fastening bolts inserted through the pair of through holes is biased toward the side close to either of the pair of fastening bolts with respect to the shaft core of the through hole inserted. Thus, even when the fastening bolt and the fastening nut are screwed together and the distance between the pair of fastening bolts is shorter than the expected distance, interference between the pair of fastening bolts and the partition plate valve is suppressed. The partition plate valve can be efficiently and reliably inserted into the flow path blocking position.
Therefore, it is possible to efficiently and reliably perform the insertion / removal movement of the partition plate valve with a simple configuration.

  In a further characteristic configuration of the in-pipe flow path blocking device according to the present invention, the interference suppression means is configured such that the fastening nut is screwed onto an outer peripheral surface of a bolt shaft portion of at least one fastening bolt of the pair of fastening bolts. It is in the point comprised by the recessed part formed in the inner diameter side rather than the site | part in which the external thread part was formed.

According to the above characteristic configuration, since the interference suppression means is configured by the recess formed in the outer peripheral surface of the bolt shaft portion of the fastening bolt at the inner diameter side with respect to the portion where the male screw portion is formed, the recess is The outer diameter of the formed part is smaller than the outer diameter of the part where the male screw portion is formed.
Thereby, regarding the adjacent distance between the bolt shaft portions (outer diameter portions) of the pair of fastening bolts, the adjacent distance of the portion where the concave portion is formed is larger than the adjacent distance when the concave portion is not provided.
Therefore, for example, even when the width of the partition plate valve is formed slightly larger than the distance between adjacent pairs of through holes through which the pair of fastening bolts are inserted, The distance between adjacent bolt shafts of the pair of fastening bolts can be formed larger than the width of the partition plate valve, and when moving the partition plate valve in the insertion / removal direction, the bolts of the partition plate valve and the pair of fastening bolts It can suppress more reliably that an axial part interferes.
Therefore, it is possible to perform the insertion / removal movement of the partition valve more efficiently and reliably while having a very simple configuration.

  A further characteristic configuration of the in-pipe flow path blocking device according to the present invention is that at least a part of the recess is formed when the partition plate valve is moved in and out through the gap between the two connecting flange portions generated by the loosening operation of the fastener. However, it is comprised in the part corresponding to the clearance gap between the said both connection flange parts in the axial center direction of the said both pipe parts.

According to the above characteristic configuration, when the partition plate valve passes between adjacent pairs of fastening bolts and is inserted and removed through the gap between the connecting flange portions generated by the loosening operation of the fastener, the bolt shaft of the fastening bolt is used. Since at least a part of the recess formed in the part is located in a part corresponding to the gap between the two connecting flange parts in the axial direction of both pipe parts, a pair of fastenings in a part through which the partition plate valve passes in the axial direction The distance between adjacent bolts can be made larger than the width of the partition valve by the amount that at least a part of the recess is formed.
Thereby, the distance between adjacent bolt shaft portions (outer diameter portions) of the pair of fastening bolts in the portion through which the partition plate valve passes in the axial direction (the portion where the concave portion is formed) is adjacent when no concave portion is provided. The distance between the partition plate valve and the pair of fastening bolts when the partition plate valve is moved in the insertion / removal direction can be surely made larger than the distance between them and can be formed larger than the width of the partition plate valve. It can suppress more reliably that a part interferes.
Therefore, it is possible to perform the insertion / removal movement of the partition valve more efficiently and reliably while having a very simple configuration.

  A further characteristic configuration of the in-pipe flow path blocking device according to the present invention is that at least a part of the recess is formed when the partition plate valve is moved in and out through the gap between the two connecting flange portions generated by the loosening operation of the fastener. However, it exists in the point comprised on the straight line which connects the axis | shafts of the bolt axial part in a pair of said fastening bolt so as to oppose any one of said pair of fastening bolts.

According to the above characteristic configuration, when the partition plate valve passes between adjacent pairs of fastening bolts and is inserted and removed through the gap between the connecting flange portions generated by the loosening operation of the fastener, the bolt shaft of the fastening bolt is used. Since at least a part of the concave portion formed in the portion is configured to face any one of the bolt shaft portions in the pair of fastening bolts on a straight line connecting the shaft cores of the bolt shaft portions in the pair of fastening bolts, The distance between adjacent pairs of fastening bolts at the part through which the partition plate valve passes can be made larger than the width of the partition plate valve by the amount that at least a part of the recess is formed.
Thus, when the partition plate valve passes between adjacent bolt shafts of the pair of fastening bolts, the bolt shaft portions of the pair of fastening bolts that may interfere with each other can be provided with an appropriate position. By providing the concave portion, the distance between adjacent pairs of fastening bolts at the portion where the concave portion is formed can be reliably made larger than the width of the partition plate valve, and when moving the partition plate valve in the insertion / removal direction, It can suppress more reliably that a partition plate valve and the bolt axial part of a pair of fastening bolt interfere.
Therefore, it is possible to perform the insertion / removal movement of the partition valve more efficiently and reliably while having a very simple configuration.

  A further characteristic configuration of the in-pipe flow path blocking device according to the present invention is that the recess is an annular recess formed over the entire outer periphery of the bolt shaft portion of the at least one fastening bolt.

According to the above characteristic configuration, the recess formed in the bolt shaft portion of the pair of fastening bolts is an annular recess formed over the entire outer periphery of the bolt shaft portion of at least one fastening bolt. The position of the recessed part of the fastening bolt inserted through the through hole of the connecting flange part can be tightened and connected by the fastening nut without considering the relative positional relationship with the partition plate valve. However, interference between the pair of fastening bolts and the partition plate valve can be suppressed.
Therefore, the tightening connection is very easy, and a very simple configuration can be obtained.

  A further characteristic configuration of the in-pipe flow path shutoff device according to the present invention is such that the bolt shaft portion of the at least one fastening bolt is a cross-sectional view, and the partition plate valve is provided in at least a part of the portion where the recess is formed. It is in the point provided with the linear part parallel or substantially parallel to the insertion / extraction movement direction.

  According to the above characteristic configuration, the bolt shaft portion of at least one of the fastening bolts has, in a cross-sectional view, a linear portion that is parallel or substantially parallel to the direction in which the partition plate valve is inserted / removed in at least a part of the portion where the recess is formed. Since the straight portion is arranged so as to face the adjacent side of the pair of fastening bolts, the distance between the pair of fastening bolts is larger than the width of the partition plate valve, and along the straight portion. Thus, the contact of the partition plate valve moving in the insertion / removal direction can be reliably suppressed, and interference between the partition plate valve and the pair of fastening bolts can be suppressed.

  The further characteristic structure of the pipe | tube flow-path interruption | blocking apparatus which concerns on this invention exists in the point in which the said recessed part is formed in each of the bolt axial part in a pair of said fastening bolt.

  According to the above characteristic configuration, since the recess formed in the bolt shaft portion of the pair of fastening bolts is formed in each of the bolt shaft portions of the pair of fastening bolts, adjacent to the bolt shaft portion of the pair of fastening bolts. The distance between the partition plate valve and the pair of fastening bolts can be further reliably suppressed.

A further characteristic configuration of the in-pipe flow path blocking device according to the present invention is that each of the plurality of fastening bolts has an annular member interposed between a head of the fastening bolt and an outer surface of one of the connecting flange portions. In addition, with the O nuts interposed between the annular member and the head of the fastening bolt and between the annular member and the outer surface of the one connecting flange portion, Screwed,
Each of the fastening nuts interposes an annular member between the fastening nut and the outer surface of the other connecting flange portion, and between the annular member and the fastening nut and between the annular member and the other The O-ring that seals the space between the outer surfaces of the connecting flange portions is inserted into the male screw portion of the fastening bolt.

  According to the above characteristic configuration, the annular member is interposed between the head of each fastening bolt and one outer surface and between the fastening nut and the other outer surface via the pair of O-rings. In this state, the fastening bolt and the fastening nut are screwed together to fasten and connect the two connecting flange portions. Therefore, when the fastening bolt is screwed and fixed by the fastening nut, and when the fastening bolt and the fastening nut are loosened. Even when a gap is generated between both the connecting flange portions, the contact between the annular member and one connection flange portion and the head of the fastening bolt and the contact between the annular member and the other connection flange portion and the fastening nut Since it is maintained, it is possible to suppress fluid leakage through the through-holes that are formed through both the connecting flange portions.

A further characteristic configuration of the in-pipe flow path blocking device according to the present invention is that the interference suppression means can adjust the position of the axis of the bolt shaft portion of at least one fastening bolt of the pair of fastening bolts. Composed of members,
In the state where the axial position adjustment member is screwed into the male screw portion of the at least one fastening bolt inserted through the through hole, the head of the fastening bolt and the one connecting flange portion Or an annular main body interposed between the fastening nut and the other connecting flange, and an outer peripheral surface of a bolt shaft portion of the fastening bolt and an inner circumference of the through hole. It is in the point provided with the annular interposition part interposed between the surfaces.

According to the above characteristic configuration, the interference suppression means is constituted by the shaft position adjusting member capable of adjusting the position of the axis of the bolt shaft portion of at least one of the pair of fastening bolts. The shaft core of one fastening bolt of the pair of fastening bolts through which the leaf valve passes between adjacent ones is biased in a direction close to the other fastening bolt with respect to the shaft core of the through hole through which the one fastening bolt is inserted. Even in this state, it is possible to adjust the axis position of the one fastening bolt to a position that does not interfere with the partition plate valve by attaching the axis position adjusting member. Thereby, when a partition plate valve moves to the insertion / extraction direction, it can suppress favorably that it interferes with a pair of fastening bolt.
Specifically, the axial center position adjusting member includes an annular main body portion and an annular interposed portion provided in the annular main body portion, and is a male screw of at least one fastening bolt inserted through the through holes of both connecting flange portions. In a state where the fastening nut is screwed to the part, the annular main body part is interposed between the head of the one fastening bolt and the one connecting flange part or between the fastening nut and the other connecting flange part. Since the annular interposed portion is interposed between the outer peripheral surface of the bolt shaft portion and the inner peripheral surface of the through hole in the fastening bolt, the bolt shaft portion of the fastening bolt is formed by the annular main body portion and the annular interposed portion. Can be positioned (for example, positioned concentrically) with respect to the axial center of the through hole.
Therefore, the shaft position of at least one fastening bolt can be adjusted to a position that does not interfere with the partition plate valve by simply attaching the shaft position adjustment member, and when the partition plate valve moves in the insertion / removal movement direction, Interference with the fastening bolt can be suppressed satisfactorily.

Side view when both pipe flanges are fitted with pipe flow path blocking devices Cross-sectional view of pipe flanges installed on both connecting flanges III-III arrow view of FIG. Partial cutaway cross-sectional view of the main part showing the installed state of the in-pipe flow path blocking device Longitudinal sectional view of the main part showing the state during the insertion of the partition valve Partial cutaway cross-sectional view of the main part showing a state in the middle of inserting the partition valve Longitudinal sectional view of the main part showing the state where the pipe flow path is blocked by the partition valve Partial cutaway cross-sectional view of the main part showing the state where the pipe flow path is blocked by the partition valve IX-IX arrow view of FIG. The figure which shows the structure of the fastening bolt provided with the interference suppression means which concerns on 1st Embodiment. Side view showing the process of replacing the repair valve to be replaced with a new repair valve The figure which shows the structure of the fastening bolt provided with the interference suppression means which concerns on 2nd Embodiment. The figure which shows the structure of the fastening bolt provided with the interference suppression means which concerns on 3rd Embodiment. The longitudinal cross-sectional view of the principal part which shows the interference suppression means which concerns on 4th Embodiment

[First Embodiment]
Based on FIGS. 1-11, the pipe | tube flow-path cutoff apparatus A which concerns on embodiment of this invention is demonstrated.
As shown in FIGS. 1 to 3, in a water pipe system (an example of a fluid pipe system), a branch pipe section is provided in the middle of a water pipe (an example of a fluid pipe) 1 made of a cast iron pipe disposed in a substantially horizontal direction. (An example of a pipe part) 2 is integrally formed to project upward, and a flange part (an example of a connecting flange part) 2A is formed at the upper end of the branch pipe part 2 (FIGS. 2 and 3). reference). The flange portion 2A includes a flange portion (an example of a connection flange portion) 3A on the upstream side of a connection pipe (an example of a tube portion) 3 and a sheet packing (an example of a sealing material) between the joint surfaces of both flange portions 2A and 3A. In a state where 4 is interposed, a plurality of fasteners B arranged in the circumferential direction are detachably tightened and connected in a sealed state. The flange portion 3B on the downstream side of the connecting pipe 3 has a flange portion 5A on the upstream side of a repair valve (an example of a fluid device or piping material) 5 between the joint surfaces of both flange portions 3B and 5A. And a plurality of sets of bolts 6 and nuts 7 so as to be detachable in a sealed state. Although not shown, a fire hydrant or the like (an example of a fluid device or piping material) is detachably tightened and connected to the flange portion 5B on the downstream side of the repair valve 5 as necessary in a sealed state.

  The fastener B will be described in detail later, but a plurality of bolts and nuts (not shown) of a normal specification (for example, four sets) and a waterproof specification (for example, four sets) of a waterproof specification having an excellent sealing function are fastened. Both flange portions are composed of a bolt 30 and a fastening nut 31 and are arranged by the bolt and nut or the fastening bolt 30 and the fastening nut 31 through a plurality of through holes 2a and 3a that are equally arranged in the circumferential direction in both flange portions 2A and 3A. 2A and 3A are fastened and fixed. That is, when the replacement work of the repair valve 5 is started, the normal specification bolt / nut is replaced with the waterproof fastening bolt 30 / fastening nut 31, and when the replacement work is completed, the waterproof fastening bolt 30 / fastening nut 31 is replaced. Can be replaced with normal bolts and nuts.

  In the portion extending between the flange portion 2A of the branch pipe portion 2 and the flange portion 3A on the upstream side of the connecting pipe 3, leakage of water or failure due to deterioration is maintained while maintaining the flow of clean water in the water pipe 1. When it is necessary to replace the repair valve 5 for a reason, an in-pipe flow path blocking device A for blocking the in-pipe flow path W in the direction of the branch pipe axis Y perpendicular to the pipe axis X of the water pipe 1 is assembled. Attached.

  As shown in FIG. 1 to FIG. 9 and FIG. 11, the in-pipe flow blocking device A is a blocking that can be mounted in a state where the outer periphery of both flange portions 2A and 3A is sealed against the branch pipe portion 2 and the connecting pipe 3. Between the flow path blocking position and the flow path opening position for blocking the pipe flow path W in a sealed state through the gap S between the joint surfaces of the flange portions 2A and 3A generated by the loosening operation of the work cover C and the fastener B A thin plate-like partition plate valve D that can be inserted and removed freely, sliding guide means E that slides and guides the partition plate valve D to the flow path blocking position and the flow path opening position in a sealed state, and the periphery of the blocking work cover C Gap forming means F is provided at a plurality of locations in the direction and widens between the joint surfaces of the flange portions 2A and 3A within the range of the loosening operation allowance of the fastener B.

  The blocking work cover C is divided into two parts, an annular elastic sealing material 8 capable of being pressed from the radially outer side to the outer peripheral surfaces of the flange portions 2A and 3A, and the annular elastic sealing material 8 being fastened and fixed from the radially outer side. And a tightening ring 9 having a structure.

The annular elastic sealing material 8 is formed in an annular shape by adhering a plurality of members divided in an arc shape, and can be pressed against the outer peripheral surface of each flange portion 2A, 3A from the outside in the radial direction. A state where a part of the annular first seal portion 8a having a substantially semicircular shape and an annular opening portion 10 formed radially outwardly between adjacent outer peripheral surfaces of both flange portions 2A and 3A enters. And an annular second seal portion 8b that can be pressed from the outside in the radial direction and has a substantially semicircular cross section. The inner diameter of the annular elastic sealing material 8 is configured to be slightly smaller than the outer peripheral surface of each flange portion 2A, 3A, and when it is attached to the outer peripheral surface, it is pressed against the outer peripheral surface by elastic contraction force. It is comprised so that.
In addition, an opening 8c that allows the partition plate valve D to move in and out is formed in a part of the annular second seal portion 8b of the annular elastic seal material 8, and portions that are located on both sides in the circumferential direction of the opening 8c. In addition, through holes 8d through which the distal ends of the separation bolts 11 constituting the gap forming means F penetrate from the outside in the radial direction are formed in a total of four places, both of the parts facing each other in the radial direction. .

  The clamping ring 9 includes a pair of clamping semicircular arcs 9A and a connecting piece 9B fixed to both ends in the circumferential direction of each clamping segmenting ring 9A. Both screw bolts 9C and a pair of nuts 9D for pulling and fixing the connecting pieces 9B facing each other in the direction along the core X) are provided. When both the screw bolts 9C and the pair of nuts 9D are tightened with a set torque, an annular elastic seal is allowed in a state in which relative branching movement due to water pressure between the branch pipe portion 2 and the connecting pipe 3 accompanying the loosening operation of the fastener B is allowed. At the same time, both annular first seal portions 8a of the material 8 are hermetically pressed against the outer peripheral surfaces of both flange portions 2A and 3A with a set pressure contact force, and at the same time, the annular second seal portion 8b of the annular elastic seal material 8 is both flange portions 2A, The annular opening 10 between adjacent 3A is sealed and pressed with a set pressing force.

  The pair of tightening split wheels 9A has a larger width than the annular elastic seal material 8 in the direction of the branch axis Y, and is annular in the mounting recesses 9E formed on the inner peripheral surfaces of the pair of tightening split wheels 9A. The elastic sealing material 8 is configured to be mountable. Further, in one of the clamping divided wheels 9A, a circumferentially central position opposite to the opening 8c of the annular elastic sealing material 8 in the radial direction is a similar shape slightly larger than the cross-sectional shape of the partition valve D, In addition, a slit-like opening 9F having a function of slidingly guiding the insertion / removal movement of the partition valve D is formed. The separation bolts 11 constituting the gap forming means F penetrate from the radially outer side at four circumferential positions opposite to the respective through-holes 8d of the annular elastic seal material 8 in both tightened split rings 9A. A through hole 9G is formed.

  The partition plate valve D is formed in a thin plate shape (for example, a plate thickness of 3.2 mm) having a width larger than the inner diameters of the branch pipe portion 2 and the connecting pipe 3, and a tip edge formed in a semicircular shape has a plate shape. Chamfered into a V-shaped cross-section with the sharp end positioned at the center in the thickness direction. Further, a rod-like operation transmission shaft 12 is fixed to the center position of the rear end edge of the partition plate valve D, and an operation handle 13 is screwed and fixed to the rear end portion of the operation transmission shaft 12. The operation handle 13 includes a main body shaft portion 13a orthogonal to the operation transmission shaft 12, and an operation portion 13b extending from both ends of the main body shaft portion 13a in the same direction as the operation transmission shaft 12. The operation transmission shaft 12 is screwed and fixed to a substantially central portion of the main body shaft portion 13a.

The sliding guide means E is fixed to one of the clamping divided wheels 9A, and a part of the semicircular tip edge of the partition valve D is slidably inserted into the slit-shaped opening 9F. Tighten a plurality of sets of bolts 16 and nuts 17 to a valve case 15 having a storage space 14 in which most of the partition plate valve D can be stored, and a connecting flange portion 15A formed at the rear end of the valve case 15. The lid 18 is fixed and slidably guides the operation transmission shaft 12 of the partition plate valve D so as to be movable in the insertion / removal direction of the partition plate valve D. The connection flange portion 15A and the lid 18 are sealed in a watertight state by a sheet packing (not shown), and the lid 18 is in a watertight state between the outer peripheral surface of the operation transmission shaft 12 of the partition plate valve D. An O-ring (not shown) is provided for sealing.
When the pair of tightening split wheels 9A are mounted on the outer peripheral surfaces of both flange portions 2A and 3A, the valve case 15 and the opening 9F of one tightening split ring 9A are connected to the through holes 2a of both flanges 2A and 3A. The fastening bolts 30 inserted through 3a are mounted at circumferential positions facing adjacent portions of the pair of fastening bolts 30A that pass when the partition valve D is inserted and removed.

  Of the plurality of sets of bolts 16 and nuts 17, at least two bolts 16 </ b> A and 16 </ b> B are each configured by a substantially L-shaped hook bolt. The bolts 16A and 16B are fastened and fixed by the nut 17 in a state where the male screw portion (not shown) is screwed into the connecting flange portion 15A, and is opposite to the side where the male screw portion of the bolts 16A and 16B is formed. These end portions are formed so as to extend in a direction perpendicular to the insertion / removal direction of the partition plate valve D, and are configured to be rotatable around the insertion / removal direction of the partition plate valve D. Note that the end of the bolt 16A extends from the position closer to the lid 18 than the end of the bolt 16B in the insertion / removal direction of the partition valve D in the direction perpendicular to the direction. In a state where D is in a flow path blocking state where the pipe flow path W is blocked, it is configured to be able to be locked to the main body shaft portion 13a of the operation handle 13 by rotating in the direction.

  The gap forming means F is fixed to a portion facing each through hole 9G on the outer peripheral surface of both fastening divided wheels 9A, and has a female screw portion (not shown) screwed into the male screw portion 11a of the separation bolt 11. The screw cylinder 19 provided and the female screw portion of the screw cylinder body 19 are screwed into the annular opening 10 between the adjacent flange portions 2A and 3A to enter from the outside in the radial direction. And a plurality of separation bolts 11 provided with a tapered surface 11b at the tip end that pushes between the joint surfaces of the flange portions 2A and 3A within the range of the loosening operation allowance.

  Each separation bolt 11 is attached to each fastening split wheel 9A 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 D. A hexagonal head (not shown) for screwing with an operating tool from the outside of the screw cylinder 19 is formed, and the inner peripheral surface of the screw cylinder 19 is connected to the outer peripheral surface of each separation bolt 11. An O-ring (not shown) for sealing the gap is provided.

As shown in FIGS. 9 and 10, the fastening bolt 30 of the fastener B is integrally provided with a hexagonal head portion 30a and a rod-shaped bolt shaft portion 30b, and the bolt shaft portion 30b includes a head portion 30a and a head portion 30a. A male screw portion 30c to which a female screw portion (not shown) of the fastening nut 31 can be screwed is formed on the tip side which is the opposite side.
An annular waterproof washer (an example of an annular member) 32 that seals the outer surface of the flange portion 3A of the connecting pipe 3 is disposed on each of the contact surfaces of the heads 30a of the plurality of fastening bolts 30. Yes. In the waterproof washer 32, an O-ring 32b is attached to a recessed portion 32a formed on the surface of the fastening bolt 30 on the contact surface side of the head portion 30a, and on the side opposite to the contact surface (flange portion 3A side). An O-ring 32d is attached to the recess 32c formed on the surface. The O-ring 32d occupies substantially the entire space in the recessed portion 32c in a state where the fastening bolt 30 and the fastening nut 31 are screwed together in order to perform reliable water stop, and the outer surface of the flange portion 3A, It arrange | positions in the state contact | abutted (sealed) to the inner peripheral surface of the hollow part 32c, and the outer peripheral surface of the bolt axial part 30b of the fastening bolt 30. FIG. The arrangement of the O-ring 32d in the recess 32c can be changed as appropriate as long as it can prevent fluid leakage.

  An annular waterproof washer (an example of an annular member) 33 that seals between the outer surface of the flange portion 2A of the branch pipe portion 2 is disposed on each of the contact surfaces of the plurality of fastening nuts 31. An O-ring 33b is attached to a recess 33a formed on the surface of the fastening washer 31 in the waterproof washer 33, and is formed on the surface opposite to the contact surface (flange portion 2A side). An O-ring 33d is attached to the recess 33c. The O-ring 33d occupies substantially the entire space in the recessed portion 33c in a state where the fastening bolt 30 and the fastening nut 31 are screwed together in order to perform reliable water stop, and the outer surface of the flange portion 2A, It arrange | positions in the state contact | abutted (sealed) to the inner peripheral surface of the hollow part 33c, and the outer peripheral surface of the bolt axial part 30b of the fastening bolt 30. FIG. The arrangement of the O-ring 33d in the recess 33c can be changed as appropriate as long as it can prevent fluid leakage.

  Therefore, a clearance S is generated between the flange portions 2A and 3A in accordance with the loosening operation of the fastening bolt 30 and the fastening nut 31 that fasten and connect the flange portion 2A of the branch pipe portion 2 and the flange portion 3A of the connecting pipe 3. Even so, the contact between the waterproof washer 32 and the flange 3A and the head of the fastening bolt 30 and the contact between the waterproof washer 33 and the other flange 2A and the fastening nut 31 are maintained. The O-rings 32b, 32d, 33b, and 33d positioned between the respective contact surfaces can suppress fluid leakage through the through holes 2a and 3a formed through the flange portions 2A and 3A.

The pair of fastening bolts 30A adjacent to each other in the circumferential direction among the plurality of fastening bolts 30 is between the flange portions 2A and 3A in a state of being interposed between the pair of fastening bolts 30A and the pair of fastening bolts 30A. Interference suppression means G that suppresses interference with the partition plate valve D that is inserted and removed through the gap S is provided.
The interference suppression means G is recessed on the inner diameter side of the portion where the male screw portion 30c into which the fastening nut 31 is screwed is formed over the entire outer circumference of each of the bolt shaft portions 30b of the pair of fastening bolts 30A. The annular recess 30d is formed.

  Specifically, the annular recess 30d is formed between the male screw portion 30c and the vicinity of the head 30a on the outer peripheral surface of the bolt shaft portion 30b, and the outer diameter of the vicinity of the male screw 30c and the head 30a. It is formed so as to be a circular portion in a cross sectional view slightly smaller in diameter, but when the fastening nut 31 is screwed into the male screw portion 30c of the fastening bolt 30A and the flange portions 2A and 3A are tightened and connected. However, it is configured to have sufficient strength. Further, when the fastening bolt 30A is tightened and connected in this manner or when loosening is performed within the range of the loosening operation allowance, in the longitudinal direction of the bolt shaft portion 30b (the branch tube axis Y direction of the branch tube portion 2), The upper end of the annular recess 30d is positioned in the through hole 3a of the flange 3A, and the lower end is positioned in the through hole 2a of the flange 2A. Therefore, when the partition plate valve D is inserted and removed through the gap S between the flange portions 2A and 3A generated by the loosening operation of the fastener B, at least a part of the annular recess 30d is branched between the branch pipe portion 2 and the connecting pipe 3. Each of the annular recesses 30d in the pair of fastening bolts 30A is a bolt in the pair of fastening bolts 30A, and is configured to be located in a portion corresponding to the gap S between the flange portions 2A and 3A in the tube axis Y direction. On a straight line connecting the shaft cores Z of the shaft portion 30b, the shaft portion 30b is configured to face one of the pair of fastening bolts 30A.

Since the pair of fastening bolts 30A includes the annular recess 30d as described above, the outer diameter of the bolt shaft portion 30b of the fastening bolt 30A in the portion where the annular recess 30d is formed is the portion where the male screw portion 30c is formed. Smaller than the outer diameter.
Therefore, the width of the partition valve D is larger than the inner diameter of the branch pipe portion 2 and the connecting pipe 3 (the inner diameter of the pipe flow path W), and adjacent to the pair of through holes 2a through which the pair of fastening bolts 30A are inserted. Even if it is formed slightly larger than the inter-distance and the inter-adjacent distance of the pair of through holes 3a, the width of the partition plate valve D is larger than the inter-adjacent distance of the portion where the annular recess 30d of the pair of fastening bolts 30A is formed. If it is small, it can be set appropriately. That is, it is adjacent to the portion where the annular recess 30d is formed in the bolt shaft portion 30b of the pair of connecting bolts 30A, rather than the distance between adjacent bolt shaft portions 30b (the annular recess 30d is not formed) of the plurality of fastening bolts 30. The distance can be increased reliably. Accordingly, when the partition plate valve D is moved in the insertion / removal movement direction, the partition plate valve D is moved in a direction slightly inclined with respect to the insertion / removal movement direction, or the shaft core Z of the fastening bolt 30A screwed with the fastening nut 31 is inserted into the through hole. A pair of fastenings through which the gate valve D is passed by the annular recess 30d even if it is clamped and connected to either one of the pair of fastening bolts 30A with respect to the shaft cores 2a and 3a (not shown) The distance between the bolts 30A can be made relatively large, and the partition plate valve D and the pair of connecting bolts 30A can be inserted and moved between the adjacent passages of the pair of connecting bolts 30A into the flow path blocking position and the flow path opening position. Interference can be prevented / suppressed.

Next, a flow path blocking method for blocking the pipe flow path W using the pipe flow path blocking device A configured as described above will be described.
First, as shown in FIG. 1 and FIG. 2, a plurality of sets of bolts and nuts of a normal specification of a fastener B that fastens and connects the flange portion 2A of the branch pipe portion 2 and the flange portion 3A of the connecting pipe 3 (see FIG. (Not shown) are replaced with waterproof fastening bolts 30 and fastening nuts 31 in one or two sets. At the time of this replacement, when one of the clamping split wheels 9A provided with the valve case 15 is mounted on the outer peripheral surfaces of both flange portions 2A and 3A, The pair of fastening bolts 30 through which the partition plate valve D passes between adjacent ones are replaced with a pair of waterproof fastening bolts 30A. In addition, when replacing a plurality of sets of bolts and nuts with normal specifications with fastening bolts 30 with waterproof specifications, all of the fastening bolts 30 may be replaced with fastening bolts 30A.

  When the annular elastic sealing material 8 of the shut-off work cover C is mounted on a portion extending between the outer peripheral surface of the flange portion 2A of the branch pipe portion 2 and the outer peripheral surface of the flange portion 3A on the upstream side of the connecting pipe 3, The elastic first seal portion 8a is pressed against the outer peripheral surfaces of both flange portions 2A and 3A with an elastic force smaller than the set pressure contact force, and at the same time, the elastic second seal portion 8b of the annular elastic seal material 8 is both flange portions 2A, In a state in which a part of the annular opening 10 formed between the adjacent portions of 3A enters, it is pressed with an elastic force smaller than the set pressure contact force, and the annular elastic sealing material 8 is held by both flange portions 2A and 3A with an elastic force. The

  Next, a pair of fastening divided wheels 9A of the blocking work cover C is applied to the outer peripheral surface of the annular elastic sealing material 8, and the partitioning piece 9B is fixed to the connecting pieces 9B fixed to both circumferential ends of each fastening divided wheel 9A. The connecting pieces 9B facing each other in the direction of inserting and removing the plate valve D are attracted and fixed by both screw bolts 9C and a pair of nuts 9D, and accompanying the loosening operation of the fastening bolt 30 (including the fastening bolt 30A) and the fastening nut 31 Both elastic first seal portions 8a of the annular elastic seal material 8 are sealed to the outer peripheral surfaces of the flange portions 2A and 3A with a set pressure contact force in a state in which relative separation movement due to water pressure between the branch pipe portion 2 and the connecting pipe 3 is allowed. Simultaneously with the pressure contact, the elastic second seal portion 8b of the annular elastic sealing material 8 is hermetically pressed to the annular opening 10 between the adjacent flange portions 2A and 3A with a set pressure contact force. In addition, the annular elastic sealing material 8 and the pair of tightening split rings 9A of the blocking work cover C are simultaneously connected to the outer peripheral surface of the flange portion 2A of the branch pipe portion 2 and the outer peripheral surface of the flange portion 3A on the upstream side of the connecting pipe 3. It is good also as a structure coat | covered to the site | part over.

  In this state where the blocking work cover C is attached to the branch pipe portion 2 and the connecting pipe 3, most of the partition plate valve D is stored in the storage space 14 of the valve case 15, and half of the partition plate valve D. A part of the arcuate tip edge is in a state of entering into the opening 9F of the fastening split ring 9A, the opening 8c of the annular elastic sealing material 8, and the annular opening 10 of both flange portions 2A and 3A. The valve D is located at the flow path opening position.

  In the state where the blocking work cover C is attached to the branch pipe portion 2 and the connecting pipe 3, the opening 9 </ b> F of the tightening split ring 9 </ b> A communicating with the storage space 14 of the valve case 15 and the opening 8 c of the annular elastic sealing material 8 are The opening 9F, the opening 8c, and the fastening bolt 30A are positioned on the extension line in the insertion / removal direction of the partition plate valve D accommodated in the storage space 14 of the valve case 15 and positioned adjacent to the pair of fastening bolts 30A. Adjacent and in-pipe flow paths W are positioned in the order of description.

  Next, the fastening bolt 30 (including the fastening bolt 30A) and the fastening nut 31 are sequentially loosened by a dimension corresponding to the set gap S, so that the partition plate valve D is interposed between the joint surfaces of the flange portions 2A and 3A. The gap S that can be entered with a little margin appears. At this time, if necessary, the head of the separation bolt 11 (not shown) is held substantially in the screw cylinder 19 and the tapered surface 11b faces the annular opening 10 between the flange portions 2A and 3A. ) With the operating tool, the tapered surface 11b is screwed and moved inward in the radial direction, and both flange portions 2A are within the range of the loosening operation allowance of the fastening bolt 30 (fastening bolt 30A) and fastening nut 31. Forcibly spread between 3A.

  At this time, the flange portion 3A of the connecting tube 3 moves upwardly away from the flange portion 2A of the branch tube portion 2, but the head 30a of the fastening bolt 30 (including the fastening bolt 30A) and the outer surface of the flange portion 3A. The sealed state is maintained by the waterproof washer 32 interposed therebetween, and the sealed state is maintained by the waterproof washer 33 interposed between the fastening nut 31 and the outer surface of the flange portion 2A.

  When the partition plate valve D is inserted from the flow path opening position to the flow path blocking position through the set gap S between the joint surfaces of the flange portions 2A and 3A, the flange portion 2A of the branch pipe portion 2 and the connecting pipe 3 The in-pipe flow path W between the flange portion 3A is blocked. In a state where the partition plate valve D is positioned in a flow path blocking state where the pipe flow path W is blocked, the end of the bolt 16A is rotated to be engaged with the main body shaft portion 13a of the operation handle 13, and the partition plate valve D Can be prevented from moving out. Then, with the partition plate valve D positioned at the flow path blocking position sandwiched between the flange portions 2A and 3A, the separation bolts 11 provided at a plurality of locations in the circumferential direction of the blocking work cover C are moved to the clearance release position. After loosening operation, the fastening bolt 30 and the fastening nut 31 are fastened and fixed again, so that the in-pipe flow path W is reliably blocked.

Here, when the partition plate valve D is inserted and operated from the flow path opening position to the flow path blocking position, the partition valve D is in a state of being interposed between adjacent pairs of fastening bolts 30A as described above. The gap between the flanges D is inserted and moved through the gap S between the flanges, but the width of the partition plate valve D is larger than the inner diameter of the branch pipe portion 2 and the connecting pipe 3 (the inner diameter of the in-pipe flow path W), and The adjacent distance between the pair of through holes 2a through which the pair of fastening bolts 30A are inserted and the adjacent distance between the pair of through holes 3a are formed slightly larger.
Therefore, when the partition valve D is inserted / removed with a slight inclination with respect to the intended insertion / removal direction, or the axial centers Z of the pair of fastening bolts 30A are the shafts of the pair of through holes 2a and the pair of through holes 3a. In the case where it is tightened and connected in a state of being close to any one of the pair of fastening bolts 30A with respect to the core (the state of being displaced), the partition plate valve D interferes with the bolt shaft portion 30b of the pair of fastening bolts 30A. Therefore, the insertion / removal movement may be difficult or impossible.

However, an annular recess 30d is formed on the outer peripheral surface of each of the bolt shaft portions 30b of the pair of fastening bolts 30A. The annular recess 30d is formed on the inner diameter side of the portion where the male screw portion 30c is formed. The outer diameter of the part where the recess 30d is formed is smaller than the outer diameter of the part where the male screw part 30c is formed.
Thereby, regarding the adjacent distance between the bolt shaft portions (outer diameter portions) 30b of the pair of fastening bolts 30A, the adjacent distance of the portion where the annular recess 30d is formed is greater than the adjacent distance when the annular recess 30d is not provided. Also grows.
Therefore, for example, even when the width of the partition plate valve D is slightly larger than the distance between adjacent pairs of the through holes 2a and the pair of through holes 3a through which the pair of fastening bolts 30A are inserted. The distance between the adjacent bolt shaft portions 30b of the pair of fastening bolts 30A in the portion where the annular recess 30d is formed can be formed larger than the width of the partition plate valve D, and the partition plate valve D can be inserted and removed in the insertion / removal direction. When it moves, it can suppress more reliably that the partition plate valve D and the bolt axial part 30b of a pair of fastening bolt 30A interfere.
Further, since the annular recess 30d is formed over the entire outer periphery of the bolt shaft portion 30b of the pair of fastening bolts 30A, the fastening in a state in which the annular recess 30d is inserted into the through holes 2a and 3a of both flange portions 2A and 3A. The position of the annular recess 30d of the bolt 30A can be tightened and connected by the fastening nut 31 without considering the relative positional relationship with the partition valve D, and even if tightened in this way, the pair of fastening bolts 30A and Interference with the partition valve D can be suppressed.
Therefore, it is possible to perform the insertion / removal movement of the partition plate valve D more efficiently and reliably while the tightening connection is very easy and the structure is very simple.

  Next, a seat packing (not shown) interposed between the joint surfaces of the flange portion 2A of the branch pipe portion 2 and the flange portion 3A of the connecting pipe 3 is inserted into the flow path blocking position of the partition plate valve D. When not damaged or deteriorated by the operation, as shown in FIG. 11, the downstream side flange portion 3 </ b> B of the connecting pipe 3 and the upstream side of the repair valve 5 in the shut-off state of the pipe flow path W described above. The bolt 6 and the nut 7 which are tightened and connected to the flange portion 5A are removed and replaced with a new repair valve 5 '.

  When the replacement with the new repair valve 5 ′ is completed, the fastening bolt 30 (including the fastening bolt 30 </ b> A) and the fastening nut 31 are loosened to move the separating bolt 11 so that the tapered surface 11 b moves radially inward. And the partition plate valve D at the flow path blocking position is pulled out to the flow path open position, and then the separation bolt 11 is loosened to the clearance release position, and the fastening bolt 30 (including the fastening bolt 30A) is operated. -The fastening nut 31 is tightened and the flange portion 2A of the branch pipe portion 2 and the flange portion 3A of the connecting pipe 3 are tightened and connected in a sealed state. Then, after removing the shut-off work cover C from the branch pipe portion 2 and the connecting pipe 3, the waterproof specification fastening bolt 30 (including the fastening bolt 30 </ b> A) and the fastening nut 31 are bolts of normal specification in one or two sets.・ Replace with nuts.

  Whether the seat packing 4 interposed between the joint surfaces of the flange portion 2A of the branch pipe portion 2 and the flange portion 3A of the connecting pipe 3 is damaged by the operation of inserting the partition plate valve D into the flow path blocking position. If it is deteriorated and it is necessary to replace it with a new seat packing, since it is a known method, a detailed description is omitted, but the repair valve 5 is removed and a work on / off valve (not shown) is installed. Attach to the work on / off valve, a flow path shut-off device that shuts off the pipe flow path W in the branch pipe section 2 as the upstream pipe section through the pipe flow path W in the connection pipe 3 as the downstream pipe section (FIG. (Not shown), and the seat packing 4 and the repair valve 5 are replaced.

[Second Embodiment]
In the first embodiment, as the interference suppression means G, the outer peripheral surface of each of the bolt shaft portions 30b of the pair of fastening bolts 30A among the plurality of fastening bolts 30 of the fastener B extends over the entire circumference of the outer peripheral surface. In addition, although an example in which an annular recess (an example of a recess) 30d that is recessed toward the inner diameter side of the portion where the male screw portion 30c into which the fastening nut 31 is screwed is employed has been shown, The following configuration can also be adopted.
For example, in the second embodiment of the interference suppressing means G in the in-pipe flow path blocking device A, the outer periphery of the bolt shaft portion 30b of the pair of fastening bolts 30A among the plurality of fastening bolts 30 of the fastener B is shown in FIG. Each of the surfaces is provided with one recess 30e in the circumferential direction that is recessed toward the inner diameter side of the portion where the male screw portion 30c into which the fastening nut 31 is screwed is formed.
Specifically, the concave portion 30e is formed between the male screw portion 30c and the vicinity of the head portion 30a at one location in the circumferential direction of the outer peripheral surface of the bolt shaft portion 30b, and the portion where the concave portion 30e is formed. The concave portion 30e has a substantially D-shape in a cross sectional view slightly smaller than the outer diameter of the vicinity of the male screw portion 30c and the head portion 30a. Is formed. Even when the fastening nut 31 is screwed into the male screw portion 30c of the fastening bolt 30A and both the flange portions 2A and 3A are tightened and connected, sufficient strength is provided. Further, when the fastening bolt 30A is tightened and connected in this manner or when loosening is performed within the range of the loosening operation allowance, in the longitudinal direction of the bolt shaft portion 30b (the branch tube axis Y direction of the branch tube portion 2), The upper end portion of the recess 30e is positioned in the through hole 3a of the flange portion 3A, and the lower end portion is positioned in the through hole 2a of the flange portion 2A.
Therefore, when the partition plate valve D is inserted and removed through the gap S between the flange portions 2A and 3A generated by the loosening operation of the fastener B, at least a part of the recess 30e is the branch pipe portion 2 and the branch pipe of the connecting pipe 3. Each of the recesses 30e in the pair of fastening bolts 30A is configured to be positioned at a portion corresponding to the gap S between the both flange portions 2A, 3A in the axis Y direction. On the straight line connecting the shaft cores Z of 30b, it is configured to face either one of the pair of fastening bolts 30A.

[Third Embodiment]
Similarly, for example, the third embodiment of the interference suppression means G in the in-pipe passage blocking device A is shown in FIG. 13, and the bolt shaft portion of the pair of fastening bolts 30A among the plurality of fastening bolts 30 of the fastener B is used. On each of the outer peripheral surfaces of 30b, two recesses 30e are formed in the circumferential direction that are recessed toward the inner diameter side of the portion where the male screw portion 30c into which the fastening nut 31 is screwed.
Specifically, the recess 30e is formed between the male screw portion 30c and the vicinity of the head 30a at two locations facing each other in the circumferential direction of the outer peripheral surface of the bolt shaft portion 30b, and the recess 30e is formed. The part is provided with a straight part parallel to or substantially parallel to the insertion / removal direction of the partition valve D, and is formed in a substantially I shape in a cross sectional view slightly smaller than the outer diameter of the part near the male screw part 30c and the head part 30a. ing. Even when the fastening nut 31 is screwed into the male screw portion 30c of the fastening bolt 30A and both the flange portions 2A and 3A are tightened and connected, sufficient strength is provided. Further, when the fastening bolt 30A is tightened and connected in this manner or when loosening is performed within the range of the loosening operation allowance, in the longitudinal direction of the bolt shaft portion 30b (the branch tube axis Y direction of the branch tube portion 2), The upper end portion of the recess 30e is positioned in the through hole 3a of the flange portion 3A, and the lower end portion is positioned in the through hole 2a of the flange portion 2A. Therefore, when the partition plate valve D is inserted and removed through the gap S between the flange portions 2A and 3A generated by the loosening operation of the fastener B, at least a part of the recess 30e is the branch pipe portion 2 and the branch pipe of the connecting pipe 3. Each of the recesses 30e in the pair of fastening bolts 30A is configured to be positioned at a portion corresponding to the gap S between the both flange portions 2A, 3A in the axis Y direction. On the straight line connecting the shaft cores Z of 30b, it is configured to face either one of the pair of fastening bolts 30A.

[Fourth Embodiment]
In the first to third embodiments, as the interference suppression means G, the annular recess 30d and the recess 30e are formed in the outer peripheral surface of the bolt shaft portion 30b of the pair of fastening bolts 30A among the fastening bolts 30 of the fastener B. Although it was set as a structure, it is not restricted to such a structure, For example, as shown in FIG. 14, in 4th Embodiment, the interference suppression means G is made into the bolt axial part of a pair of fastening bolt 30A among several fastening bolts 30. As shown in FIG. The axial center Z of 30b can also be comprised by the axial center position adjustment member 50 which can adjust a position.
Specifically, in a state where the shaft core position adjusting member 50 is screwed into the male screw portion 30c of the pair of fastening bolts 30A inserted through the through holes 2a and 3a of the flange portions 2A and 3A. An annular main body 50A interposed between the head 30a (waterproof washer 32) of the fastening bolt 30A and the one flange portion 3A, and a bolt shaft portion of the fastening bolt 30A provided on the annular main body 50A. An annular interposed portion 50B interposed between the outer peripheral surface of 30b and the inner peripheral surface of the through hole 3a is provided.
Similarly, the shaft center position adjusting member 50 is formed with the fastening nut 31 in a state where the fastening nut 31 is screwed into the male screw portion 30c of the fastening bolt 30A inserted through the through holes 2a and 3a of the flange portions 2A and 3A. An annular main body 50A interposed between the (waterproof washer 33) and the other flange 2A, an annular main body 50C, and an outer peripheral surface of the bolt shaft portion 30b and the through hole 2a of the fastening bolt 30A. An annular interposition part 50D interposed between the inner peripheral surface and the inner peripheral surface is provided.
The shaft center position adjusting member 50 is made of an elastic member such as rubber, and the annular main body 50A of the shaft center position adjusting member 50 occupies substantially the entire space in the recess 32c of the waterproof washer 32. And it arrange | positions in the state contact | abutted (sealed) to the outer side surface of the flange part 3A, and the cyclic | annular interposition part 50B is formed in the annular | circular shape from the internal diameter side of the said cyclic | annular main-body part 50A below, and is formed in fastening bolt 30A. In the state where it abuts (seals) the outer peripheral surface of the bolt shaft portion 30b and the inner peripheral surface of the through hole 3a. Similarly, the annular main body portion 50C of the shaft center position adjusting member 50 occupies substantially the entire space in the recess portion 33c of the waterproof washer 33, and is disposed in a state of contacting (sealing) with the outer surface of the flange portion 2A. The annular interposing part 50D is formed to project from the inner diameter side to the upper side of the annular main body part 50C in an annular shape, and contacts the outer peripheral surface of the bolt shaft part 30b and the inner peripheral surface of the through hole 2a in the fastening bolt 30A. It is placed in contact (sealed).
In addition, it is not the structure which provides both the axial center position adjustment member 50 by the side of the head 30a of the fastening bolt 30A, and the axial center position adjustment member 50 by the side of the fastening nut 31, but the axial center position adjustment member 50 is only in any one. It is good also as a structure to provide.
Thereby, for example, the shaft core Z of the pair of fastening bolts 30A through which the partition plate valve D passes is adjacent to the shaft cores of the through holes 2a and 3a through which the pair of fastening bolts 30A are inserted. Even if it is in a state of being biased in a direction close to any of the fastening bolts 30A, the position of the shaft center Z of the pair of fastening bolts 30A can be changed to the partition plate valve D by attaching the shaft center position adjusting member 50. The position can be adjusted so as not to interfere. That is, the position of the axial center Z of the bolt shaft portion 30b of the fastening bolt 30A by the annular body portions 50A and 50C and the annular interposed portions 50B and 50D is set with respect to the axial center of the through holes 2a and 3a through which the fastening bolt 30A is inserted. Positioning (for example, positioning in a concentric state). Therefore, it is possible to satisfactorily suppress interference between the pair of fastening bolts 30A when the partition plate valve D moves in the insertion / removal direction.

[Another embodiment]
(1) In the said 1st-4th embodiment, in the cross-sectional view of the branch pipe part 2 and the connection pipe 3 (both flange part 2A, 3A), the pipe inner flow path W and both flanges of the branch pipe part 2 and the connection pipe 3 Various arrangement relations of the plurality of through holes 2a and 3a of the parts 2A and 3A are set according to the nominal diameters of the branch pipe part 2 and the connecting pipe 3, etc. In the connecting pipe 3 (a longitudinal sectional view of both flange portions 2A and 3A), a pair of through-holes 2a through which the pair of fastening bolts 30A are inserted among the plurality of through-holes 2a and 3a, and the pair of through-holes 3a and the pipe flow In the case where the passage W partially overlaps, the example in which the width of the partition plate valve D is formed to a sufficient width that can reliably block the in-pipe flow path W has been described. However, the arrangement relationship is not limited to such an arrangement relationship, and in the case of various arrangement relationships, when the divider plate valve D is inserted, the divider plate valve D is provided by providing the interference suppression means G described above. Interference with the pair of fastening bolts 30A inserted through the pair of through-holes 2a and the pair of through-holes 3a is suppressed, and the insertion operation to the flow path blocking position is ensured efficiently and reliably. It can be carried out.

(2) In the first to third embodiments, the interference suppression means G is provided on the pair of fastening bolts 30 in which the partition plate valve D passes between adjacent ones of the plurality of fastening bolts 30, and the pair of fastening bolts. Although configured as 30A, at least one of the other fastening bolts 30 can also be configured by a fastening bolt 30A provided with interference suppression means G.
In the first to third embodiments, the number of sets of the fastening bolts 30 and the fastening nuts 31 is described as four. However, the number of sets is not particularly limited, and may be greater than this.

(3) In the first to third embodiments, the interference suppression means G is provided in each of the bolt shaft portions 30b of the pair of fastening bolts 30A. However, only one of the fastening bolts 30A has the interference suppression means G. It is good also as a structure which provides.

(4) In the first embodiment, the annular recess 30d as the interference suppression means G is formed over the entire circumference in the outer circumferential surface of the bolt shaft portion 30b of the fastening bolt 30A. There may be a portion where no recess is formed.
In the second and third embodiments, the concave portion 30e as the interference suppression means G is provided at one or two locations in the circumferential direction on the outer peripheral surface of the bolt shaft portion 30b of the fastening bolt 30A. The number can be changed as appropriate, and three or more locations may be provided.
Furthermore, although the bottom surface of the recess 30e is formed as a straight line portion that is parallel or substantially parallel to the insertion movement direction of the partition plate valve D, it is not limited to a straight line, and may be formed by a curved line or a plurality of straight lines.

(5) In the first to fourth embodiments, a waterproof washer 32 is interposed between the heads 30a of the plurality of fastening bolts 30 and the outer surface of the flange portion 3A of the connecting pipe 3, and the plurality of fastening bolts. The waterproof washer 33 is interposed between the fastening nut 31 screwed into each of the 30A and the outer surface of the flange portion 2A of the branch pipe portion 2, but the waterproof fastening bolt 30 and fastening nut 31 are as follows. Other configurations can be employed.

(6) In the first to fourth embodiments, the example in which the pipe flow path W is blocked by the pipe flow path blocking device A and the repair valve 5 located on the downstream side of both flange portions 2A and 3A is removed is described. The fluid device to be removed is not limited to the repair valve 5, and may be a fire hydrant, an air valve, a short pipe, or other fluid devices.

  Note that the configurations disclosed in the above-described embodiments (including other embodiments, the same applies hereinafter) can be applied in combination with the configurations disclosed in the other embodiments as long as no contradiction arises. The embodiment disclosed in this specification is an exemplification, and the embodiment of the present invention is not limited to this. The embodiment can be appropriately modified without departing from the object of the present invention.

  As described above, it is possible to provide an in-pipe flow path blocking device that can efficiently and surely move a partition plate valve in and out with a simple configuration.

2 Branch pipe section (pipe section)
2A Flange (Connecting flange)
2a Through-hole 3 Connecting pipe (pipe part)
3A Upstream flange (connecting flange)
3a Through hole 4 Sheet packing (seal material)
30 Fastening bolt (fastener)
30A fastening bolt (fastener)
30a Head 30b Bolt shaft portion 30c Male thread portion 30d Annular recess (recess, interference suppression means)
31 Fastening nut (fastener)
32 Waterproof washer (annular member)
32b O-ring 32d O-ring 33 Waterproof washer (annular member)
33b O-ring 33d O-ring 30e Recess (interference suppression means)
50 Axle position adjustment member (interference suppression means)
50A Annular body (axial center position adjustment member)
50B Annular interposition part (axial core position adjustment member)
50C Annular body (axial center position adjustment member)
50D Annular intervention (axial core position adjustment member)
A In-pipe flow path blocking device B Fastener C Shut-off work cover D Partition valve G Interference suppression means S Gap W In-pipe flow path X Pipe axis Y Branch pipe axis Z Z axis

Claims (8)

In a state in which the outer periphery of both the connecting flange portions is sealed against both pipe portions that are tightened and connected by a plurality of fasteners arranged in the circumferential direction with a sealing material interposed between the joint surfaces of the both connecting flange portions. A shut-off work cover that can be mounted is provided, and the shut-off work cover has a channel shut-off position and a flow for shutting off the in-pipe flow path in a sealed state through a gap between both the connecting flange portions generated by the loosening operation of the fastener. An in-pipe flow path blocking device provided with a thin plate-like partition plate valve that can be freely inserted and removed between a path opening position,
Each of the plurality of fasteners includes a fastening bolt inserted into each of the plurality of through holes arranged in the circumferential direction in the both connecting flange portions, and a fastening nut screwed into the fastening bolt,
Among the plurality of fastening bolts, interference between the pair of fastening bolts adjacent in the circumferential direction and the partition valve that is inserted and removed through the gap between the connecting flange portions in a state between the pair of fastening bolts is suppressed. With interference suppression means ,
The interference suppression means is formed on the outer peripheral surface of the bolt shaft portion of at least one of the pair of fastening bolts so as to be recessed closer to the inner diameter side than the portion where the male screw portion into which the fastening nut is screwed is formed. An in- pipe flow path blocking device constituted by a concave portion . When the partition valve is moved in and out through the gap between the two connecting flange portions generated by the loosening operation of the fastener, at least a part of the recess is between the two connecting flange portions in the axial direction of the two pipe portions. The in-pipe flow path blocking device according to claim 1 , wherein the in-pipe flow path blocking device is configured to be located at a portion corresponding to the gap. When the partition plate valve is moved in and out through the gap between the connecting flange portions generated by the loosening operation of the fastener, at least a part of the concave portion is connected to the shaft cores of the bolt shaft portions of the pair of fastening bolts. The in-pipe flow path blocking device according to claim 1 or 2 , configured to face one of the pair of fastening bolts on a connecting straight line. The in-pipe flow path cutoff device according to any one of claims 1 to 3 , wherein the recess is an annular recess formed over the entire outer periphery of the bolt shaft portion of the at least one fastening bolt. Claim 1 bolt portion in the at least one fastening bolt, in cross section view, provided with parallel or approximately parallel linear portions and disconnecting the direction of movement of the gate plate valve at least a portion of the site where the recess is formed The in-pipe flow-path cutoff apparatus as described in any one of -4 . The in-pipe flow path blocking device according to any one of claims 1 to 5 , wherein the recess is formed in each of bolt shaft portions of the pair of fastening bolts. Each of the plurality of fastening bolts has an annular member interposed between the head of the fastening bolt and the outer surface of one of the connecting flange portions, and between the annular member and the head of the fastening bolt. And in the state of interposing O-rings that seal between the annular member and the outer surface of the one connecting flange portion, respectively, are screwed together by the fastening nut,
Each of the fastening nuts interposes an annular member between the fastening nut and the outer surface of the other connecting flange portion, and between the annular member and the fastening nut and between the annular member and the other The in-pipe flow according to any one of claims 1 to 6 , wherein an O-ring that seals between the outer surfaces of the connecting flange portions is interposed, and is screwed into a male screw portion of the fastening bolt. Road blocking device. In a state in which the outer periphery of both the connecting flange portions is sealed against both pipe portions that are tightened and connected by a plurality of fasteners arranged in the circumferential direction with a sealing material interposed between the joint surfaces of the both connecting flange portions. A shut-off work cover that can be mounted is provided, and the shut-off work cover has a channel shut-off position and a flow for shutting off the in-pipe flow path in a sealed state through a gap between both the connecting flange portions generated by the loosening operation of the fastener. An in-pipe flow path blocking device provided with a thin plate-like partition plate valve that can be freely inserted and removed between a path opening position,
Each of the plurality of fasteners includes a fastening bolt inserted into each of the plurality of through holes arranged in the circumferential direction in the both connecting flange portions, and a fastening nut screwed into the fastening bolt,
Among the plurality of fastening bolts, interference between the pair of fastening bolts adjacent in the circumferential direction and the partition valve that is inserted and removed through the gap between the connecting flange portions in a state between the pair of fastening bolts is suppressed. With interference suppression means,
The interference suppression means is constituted by an axis position adjusting member capable of adjusting the position of the axis of the bolt axis in at least one of the pair of fastening bolts;
In the state where the axial position adjustment member is screwed into the male screw portion of the at least one fastening bolt inserted through the through hole, the head of the fastening bolt and the one connecting flange portion Or an annular main body interposed between the fastening nut and the other connecting flange, and an outer peripheral surface of a bolt shaft portion of the fastening bolt and an inner circumference of the through hole. have that pipe flow passage interrupting device and an annular interposed portion which is interposed between the surface.

Images