JP7096583B2 - Fluid equipment installation method and fluid equipment used for it - Google Patents

Description

In the present invention, at the branch formation site of the existing pipe, both first connecting portions that can be connected to both cut pipe portions of the existing pipe that is cut in a continuous flow state and the crossing direction with respect to the pipe axis direction of the existing pipe. A fluid device installation method for installing and connecting a fluid device provided with a second connection portion that opens in, and a flow path switching section that switches the flow direction of the fluid with respect to both the first connection portions and the second connection portion. Regarding the fluid equipment used for it.

As the above-mentioned method for installing a fluid device, there is a method for attaching a switching valve for continuous water work shown in Patent Document 1. In this mounting method, the fluid device is composed of a switching valve. The switching valve is connected to the valve box portion forming the cylindrical valve chamber and the portion of the valve box portion facing each other in the pipe axis direction in a communicating state, and forms the first connecting portion on the tip side. Abbreviated as having both first connecting pipe portions and a second connecting pipe portion which is connected to the branch corresponding portion of the valve box portion in a communicating state and has a second connecting portion formed on the tip side. It has a T-shaped branch connection pipe.

The flow path switching part of the switching valve is a fluid pipe in the valve box part of the branch connecting pipe with the intersection of the pipe axis of both first connecting pipes and the branching shaft of the second connecting pipe as the rotation axis. An arcuate valve body that rotates with a radius larger than the radius is arranged, and a valve seat is formed on the inner surface of the valve box portion. The valve body has a first closing position for closing the opening on the valve chamber side of one first connecting pipe portion, a second closing position for closing the opening on the valve chamber side of the other first connecting pipe portion, and a second. It is configured to be rotatable and switchable to the third closing position that closes the opening on the valve chamber side of the connecting pipe portion. A packing is provided on the closing surface on the outer side in the radial direction of rotation of the valve body in contact with and sealing the valve seat of the valve box portion from the first closing position to the third closing position.

Japanese Unexamined Patent Publication No. 8-193686

In the above-mentioned conventional method, since the valve seat is formed in the valve chamber of the large branch connecting pipe in which both the first connecting pipe and the second connecting pipe are connected to the valve box, the manufacturing cost of the branch connecting pipe rises. Easy to change. Moreover, when a reverse pressure state is reached in which a fluid pressure is applied to the closed surface of the valve body in the closed position, the fluid pressure in the direction away from the valve seat of the valve box portion acts on the valve body. Therefore, there is an inconvenience that the surface pressure of the packing of the valve body in contact with the valve seat of the valve box portion decreases, and the water stopping function (sealing function) of the valve body decreases.

In view of this situation, the main subject of the present invention is to reduce the manufacturing cost of the branch connecting pipe and to facilitate the construction, and to surely switch the fluid flow direction with respect to both the first connecting portion and the second connecting portion. However, it is an object of the present invention to provide a fluid equipment installation method capable of reliably sealing in all flow directions without considering a back pressure state and a useful fluid equipment used for the method.

The first characteristic configuration of the present invention is that both of the existing pipes that have been cut in a continuous flow state can be arranged facing each other between the two cut pipes in the housing that seals the cutting work area of the existing pipe. Flow path switching that switches the flow direction of the fluid with respect to the first connection portion, the second connection portion that opens in the crossing direction with respect to the pipe axis direction of the existing pipe, and both the first connection portions and the second connection portion. It is a method of installing a fluid device, which is a method of arranging a fluid device provided with a section and connecting the both cutting tube sections of the existing pipe and the fluid device.
The fluid device includes a branch connection pipe forming both the first connection portion and the second connection portion.
The flow path switching portion comprises a first butterfly valve connected to the first connection portion of one of the branch connection pipes and a second butterfly valve connected to the second connection portion of the branch connection pipe. Prepare,
At the time of arranging the fluid device, the first butterfly valve is set to the valve open state and the second butterfly valve is set to the valve closed state.
The first butterfly valve of the fluid device is connected to the cut tube portion of one of the existing pipes, and the other first connection portion of the fluid device is connected to the other cut tube portion of the existing pipe. There is a point to do.

According to the above configuration, the opening / closing operation of the first butterfly valve connected to one first connection portion of the branch connection pipe of the fluid device and the opening / closing operation of the second butterfly valve connected to the second connection portion of the branch connection pipe. Therefore, for example, a state in which a fluid flows from the other first connection portion to one of the first connection portions, a state in which a fluid flows from the other first connection portion to the second connection portion, and a state in which the fluid flows from the other first connection portion. It is possible to switch to a state in which a fluid flows through one of the first connection portion and the second connection portion. At this time, the first butterfly valve and the second butterfly valve can surely maintain the sealed state regardless of the back pressure state.
Since the first butterfly valve and the second butterfly valve are connected in advance to the branch connection pipe of the fluid device arranged between the two cutting pipes of the existing pipe, the branch connection pipe, the first butterfly valve and the first butterfly valve are connected in advance. 2 Compared to the case where the butterfly valve is arranged in the existing pipe and the branch pipe in a dispersed state, it can be installed in one construction for the existing pipe.
Moreover, when the fluid equipment is arranged, the first butterfly valve is in the open state and the second butterfly valve is in the closed state, so that the fluid between the two cutting pipes of the existing pipe is maintained while the fluid flow is maintained. The equipment can be arranged accurately. Further, since the second connection portion of the branch connection pipe can be closed by using the second butterfly valve, it is not necessary to attach the closing lid to the second connection portion.
Further, since the branch connecting pipe does not have a valve function, the manufacturing cost can be reduced by simplifying the structure of the branch connecting pipe.
Therefore, the manufacturing cost of the branch connecting pipe can be reduced and the construction can be facilitated, and the flow direction of the fluid with respect to both the first connecting portion and the second connecting portion can be reliably switched without considering the back pressure state. It can be securely sealed in all flow directions.

The second characteristic configuration of the present invention is that a first pipe connecting member is attached to the first butterfly valve, and the first pipe connecting member is the fluid of a joint ring attached to one of the cutting pipe portions. By moving to the device side, the joint ring is fitted and connected to the joint ring from the direction of the tube axis in a sealed state.

According to the above configuration, when the fluid device is arranged between both cutting pipe portions of the existing pipe, it is attached to one cutting pipe portion with respect to the first pipe connecting member attached to the first butterfly valve. By moving the joint ring to the fluid device side, the joint ring and the first pipe connecting member are fitted and connected in a sealed state from the pipe axis direction. Therefore, by attaching the first pipe connecting member to the first butterfly valve in advance, it is possible to efficiently connect using the joint ring attached to one of the cutting pipe portions.

In the third characteristic configuration of the present invention, a pipe connecting tube portion is formed in the other first connecting portion of the branch connecting tube, and the tube connecting tube portion is attached to the other cutting tube portion. By moving the joint ring to the fluid device side, the joint ring is fitted and connected to the joint wheel in a sealed state from the direction of the pipe axis.

According to the above configuration, when the fluid device is arranged between both cutting pipe portions of the existing pipe, the other cutting pipe portion is compared with the pipe connecting cylinder portion formed in the other first connecting portion of the branch connecting pipe. By moving the joint ring mounted on the fluid device side to the fluid device side, the joint ring and the pipe connection cylinder portion of the other first connection portion are fitted and connected from the pipe axis direction in a sealed state. Therefore, by forming the pipe connecting cylinder portion in the other first connecting portion, it is possible to efficiently connect using the joint ring attached to the other cutting pipe portion.

The fourth characteristic configuration of the present invention is that the first butterfly valve has both connecting ends configured to have a flangeless structure, and is provided at the first connecting portion of one of the branch connecting pipes when the fluid device is arranged. The first butterfly valve is sandwiched and fixed in a sealed state between the first connecting flange and the first pipe connecting member.

According to the above configuration, by using the first butterfly valve having a flangeless structure, the total length of the fluid device in the tube axis direction can be shortened, and the existing housing can be used. Moreover, by utilizing the first pipe connecting member for connecting the first butterfly valve to one cutting pipe portion with a joint ring, the first pipe connecting member and the first connecting flange of one first connecting portion are connected to each other. The first butterfly valve can be sandwiched and fixed between them in a sealed state. This makes it possible to simplify the mounting structure of the first butterfly valve and the first pipe connecting member.

The fifth feature configuration of the present invention is the fluid device used in the fluid device installation method according to any one of the above-mentioned first feature configuration to the fourth feature configuration, and the two first connection portions and the above. The branch connection pipe forming the second connection portion is provided, and the first butterfly valve of the flow path switching portion is connected to the first connection portion of one of the branch connection pipes, and the branch connection pipe is connected. The second butterfly valve of the flow path switching portion is connected to the second connection portion of the above.

According to the above configuration, the opening / closing operation of the first butterfly valve connected to one first connection portion of the branch connection pipe of the fluid device and the opening / closing operation of the second butterfly valve connected to the second connection portion of the branch connection pipe. Therefore, for example, a state in which a fluid flows from the other first connection portion to one of the first connection portions, a state in which a fluid flows from the other first connection portion to the second connection portion, and a state in which the fluid flows from the other first connection portion. It is possible to switch to a state in which a fluid flows through one of the first connection portion and the second connection portion. At this time, the first butterfly valve and the second butterfly valve can surely maintain the fully closed state regardless of the back pressure state.
Since the first butterfly valve and the second butterfly valve are connected in advance to the branch connection pipe of the fluid device arranged between the two cutting pipes of the existing pipe, the branch connection pipe, the first butterfly valve and the first butterfly valve are connected in advance. 2 Compared to the case where the butterfly valve is arranged in the existing pipe and the branch pipe in a dispersed state, it can be installed in one construction for the existing pipe.
Further, since the branch connecting pipe does not have a valve function, the manufacturing cost can be reduced by simplifying the structure of the branch connecting pipe.
Therefore, the manufacturing cost of the branch connecting pipe can be reduced and the construction can be facilitated, and the flow direction of the fluid with respect to both the first connecting portion and the second connecting portion can be reliably switched without considering the back pressure state. Water can be reliably stopped in all flow directions.

The sixth characteristic configuration of the present invention is that each of the first butterfly valve and the second butterfly valve has a flangeless structure at both connecting ends, and the first butterfly valve is one of the branch connecting pipes. The first connecting flange provided in the first connecting portion and the first pipe connecting member are sandwiched and fixed in a sealed state, and the second butterfly valve is provided in the second connecting portion of the branch connecting pipe. The point is that it is sandwiched and fixed in a sealed state between the second connecting flange and the second pipe connecting member for the branch pipe.

According to the above configuration, the total length of the fluid device in the tube axis direction can be shortened by using the first butterfly valve having a flangeless structure. Further, by using the second butterfly valve having a flangeless structure, the total length in the branch axis direction of the fluid device can be shortened.
Moreover, by utilizing the first pipe connecting member for connecting the first butterfly valve to one cutting pipe portion, the first connecting flange between the first pipe connecting member and the first connecting portion of one of the first connecting portions is used. 1 The butterfly valve can be sandwiched and fixed in a sealed state. This makes it possible to simplify the mounting structure of the first butterfly valve and the first pipe connecting member.
Further, by utilizing the second pipe connecting member for connecting the second butterfly valve to the branch pipe side, the second pipe connecting member and the second connecting flange provided at the second connecting portion of the branch connecting pipe are used. The second butterfly valve can be sandwiched and fixed between them in a sealed state. This makes it possible to simplify the mounting structure of the second butterfly valve and the second pipe connecting member.

Plan view of the fluid equipment used in the fluid equipment installation method of the present invention. Side view of fluid equipment in the direction of the branch axis Front view of fluid equipment in the direction of the tube axis FIG. 1 is a sectional view taken along line IV-IV. FIG. 1 is a sectional view taken along line VV. Cross-sectional view of the pipe axis when installing fluid equipment Cross-sectional view in plan view during installation work of fluid equipment Enlarged sectional view of the main part when connecting with a joint ring Plan view when the construction of fluid equipment is completed Side view of the branch axis when the construction of the fluid equipment is completed XI-XI line sectional view in FIG. Explanatory diagram of water flow switching state of fluid equipment Sectional drawing showing another embodiment of a fluid device

An embodiment of the present invention will be described with reference to the drawings.
[First Embodiment]
1 to 5 show the fluid device A used in the fluid device installation method of the present invention. As shown in FIGS. 6 and 7, the outline of the fluid equipment installation method is as follows. ), A fluid device A suspended and supported by the elevating device B is arranged between both cutting pipe portions (cutting remaining pipe portions) 1A and 1B on the remaining side of the existing water pipe 1. As shown in FIGS. 8 and 11, the arranged fluid device A is connected to both cutting pipe portions 1A and 1B in a watertight state by a joint ring C. After that, as shown in FIGS. 9 to 11, the fluid device A and the double joint ring C are fixedly connected by the third fixing means 10, and the joint ring C and the cutting pipe portions 1A and 1B are fixedly connected by the retaining fixing means 15. It is fixed by pulling it out.
The existing pipe (fluid pipe) of the present embodiment is a steel pipe constituting the existing water pipe 1 for transporting clean water, which is an example of a fluid, but other cast iron pipes, resin pipes, and the like can be used. .. Further, as the fluid, industrial water, gas and the like can be mentioned in addition to clean water.

Next, the fluid device A will be described in detail.
As shown in FIGS. 1 to 5, the fluid device A includes a substantially T-shaped branch connecting pipe 2 made of steel. The branch connecting pipe 2 includes a main pipe portion 23 having both first connecting portions 21 and 22 that can be arranged concentrically and opposed to both cutting pipe portions 1A and 1B on both ends, and an existing water pipe 1. A branch pipe portion 25 having a second connection portion 24 opened on the tip side in the branch shaft core Y direction (an example of the crossing direction) orthogonal to the pipe shaft core X direction is provided. The main pipe portion 23 and the branch pipe portion 25 are formed to have the same outer diameter as the existing water pipe 1. The branch pipe portion 25 is integrally formed at the central portion of the main pipe portion 23 in the pipe axis X direction.

As shown in FIG. 4, a large number of bolt insertion holes 26a are formed at a predetermined pitch along the circumferential direction at the end of the outer peripheral surface of one of the main connection portions 21 of the main pipe portion 23. The first connecting flange 26 of the above is fixed. As shown in FIGS. 1, 2, and 4, the bolt insertion hole 26a of the first connecting flange 26 holds and fixes the valve box 31 of the first butterfly valve V1, which will be described later, with the first pipe connecting member 3. It is used when doing.
As shown in FIGS. 4 and 7, on the outer peripheral surface of the other first connecting portion 22 in the main pipe portion 23, the joint ring C mounted on the other cutting pipe portion 1B is moved toward the fluid device A side. By the operation, the second pipe connecting cylinder portion 27 which is fitted and connected to the joint ring C from the direction of the pipe axis X in a sealed state is formed. As shown in FIGS. 3 and 4, a large number of bolt insertion holes 28a are provided along the circumferential direction at a predetermined pitch at the base end position of the second pipe connecting cylinder portion 27 on the outer peripheral surface of the other first connecting portion 22. The annular second connecting flange 28 is fixed. As shown in FIGS. 8 and 11, the bolt insertion hole 28a of the second connecting flange 28 is used when the seventh connecting flange 54 of the joint ring C, which will be described later, is fixedly connected.

As shown in FIGS. 1, 3, and 5, a large number of bolt insertion holes 29a are formed along the circumferential direction at a predetermined pitch at the end of the outer peripheral surface of the second connection portion 24 in the branch pipe portion 25. The annular third connecting flange 29 is fixed. As shown in FIGS. 1, 3, and 5, the bolt insertion hole 29a of the third connecting flange 29 connects the valve box 31 of the second butterfly valve V2, which will be described later, to the sixth connecting flange 6A of the second pipe connecting member 6. It is used when holding and fixing with.

Further, as shown in FIGS. 1 to 5, the fluid device A includes a flow path switching unit V for switching the flow direction of the fluid with respect to both the first connection portions 21 and 22 and the second connection portion 24 of the branch connection pipe 2. .. The flow path switching portion V includes a first butterfly valve V1 connected to one first connection portion 21 of the branch connection pipe 2 and a second butterfly valve V2 connected to the second connection portion 24 of the branch connection pipe 2. And have.
As shown in FIGS. 1 to 3, each of the first butterfly valve V1 and the second butterfly valve V2 has a disk shape in a valve box 31 in which both connecting ends 31a and 31b have a flangeless structure. The valve body 32 is arranged and configured. The upper and lower valve shafts 33 of the valve body 32 are rotatably supported around the vertical axis core by the upper and lower bearing portions 34 of the valve box 31. The valve shaft 33 on the upper side of the valve body 32 is interlocked with the gear mechanism portion 35 provided in the upper part of the valve box 31, and the rotation operation shaft 36 is provided so as to project from the gear mechanism portion 35.

Of the connection end portions 31a and 31b of the valve box 31 of the first butterfly valve V1, the connection end portion 31b that can be arranged to face one of the cutting pipe portions 1A has one of the connection end portions 31b as shown in FIGS. 8 and 11. By moving the joint ring C slidably attached to the cutting pipe portion 1A to the fluid device A side, the annular first ring is fitted and connected to the joint ring C from the pipe axis X direction in a sealed state. 1 pipe connecting member 3 is attached. As shown in FIGS. 1, 2, and 4, the first pipe connecting member 3 is bolted into a portion corresponding to the bolt insertion hole 26a of the first connecting flange 26 of the branch connecting pipe 2 in the pipe axis X direction. Bolt insertion holes 3b at locations corresponding to the bolt insertion holes 54a of the fourth connecting flange 3A in which the holes 3a are formed and the seventh connecting flange 54 of the joint ring C shown in FIGS. 8 and 11 in the pipe axis X direction. The fifth connecting flange 3B on which the is formed is provided. On the outer side of the fifth connecting flange 3B in the first pipe connecting member 3, the first pipe connecting cylinder portion 3C that is fitted and connected to the joint ring C in a sealed state from the pipe axis X direction is integrally projected. Has been done.

As shown in FIGS. 1, 2, and 4, the valve box 31 of the first butterfly valve V1 is located between the first connecting flange 26 of the branch connecting pipe 2 and the fourth connecting flange 3A of the first pipe connecting member 3. It is held and fixed by the first fixing means 4. The first fixing means 4 is a first bolt inserted across the bolt insertion hole 26a of the first connecting flange 26 in the branch connecting pipe 2 and the bolt insertion hole 3a of the fourth connecting flange 3A in the first pipe connecting member 3. A 4A and a first nut 4B screwed into each of the protruding screw shafts on both ends of the first bolt 4A are provided.
Further, as shown in FIGS. 1, 2, and 4, between the joint surface between one connection end 31a in the valve box 31 of the first butterfly valve V1 and the first connection flange 26 of the branch connection pipe 2, and. A gasket 5 for sealing in a watertight state is interposed between the joint surface of the other connection end 31b of the valve box 31 of the first butterfly valve V1 and the fourth connecting flange 3A of the first pipe connecting member 3. ..

As shown in FIGS. 1, 3, and 5, among the connection end portions 31a and 31b of the valve box 31 of the second butterfly valve V2, the connection end portion 31b that can be arranged to face the branch pipe (not shown) has a connection end portion 31b. , A circular second pipe connecting member 6 for connecting to the branch pipe side is provided. The second pipe connecting member 6 is an annular sixth connection in which a bolt insertion hole 6a is formed at a portion corresponding to the bolt insertion hole 29a of the third connection flange 29 of the branch pipe portion 25 in the branch axis Y direction. A flange 6A is provided. On the outer side of the sixth connecting flange 6A, a third pipe connecting cylinder portion 6B, which is connected to the branch pipe side in a sealed state from the branch shaft core Y direction, is integrally projected.
Further, as shown in FIG. 2, the short pipe 80 (see FIGS. 9 and 10) on the branch pipe side is attached to the sixth connecting flange 6A of the second pipe connecting member 6 after the connection work of the fluid device A. 9 A plurality of screw holes 6b for fixing and connecting the connecting flange 80A with bolts 81 and nuts 82 are formed. The screw holes 6b are arranged in the circumferential direction in a state where the positions of the screw holes 6b are inconsistent with each other by half a pitch with respect to the bolt insertion holes 6a (see FIG. 5).

As shown in FIGS. 1 to 3 and 5, the valve box 31 of the second butterfly valve V2 is located between the third connecting flange 29 of the branch pipe portion 25 and the sixth connecting flange 6A of the second pipe connecting member 6. It is held and fixed by the second fixing means 7. The second fixing means 7 is a second bolt inserted across the bolt insertion hole 29a of the third connecting flange 29 in the branch pipe portion 25 and the bolt insertion hole 6a of the sixth connecting flange 6A in the second pipe connecting member 6. 7A and a second nut 7B screwed into each of the protruding screw shafts on both ends of the second bolt 7A are provided.
Further, as shown in FIGS. 1, 3, and 5, between the joint surface between one connection end portion 31a of the valve box 31 of the second butterfly valve V2 and the third connecting flange 29 of the branch pipe portion 25, and A gasket 5 for sealing in a watertight state is interposed between the joint surface of the other connection end 31b of the valve box 31 of the second butterfly valve V2 and the sixth connecting flange 6A of the second pipe connecting member 6. ..

As shown in FIGS. 1 and 2, on the upper surface of the main portion 23 of the branch connecting pipe 2, a plate-shaped suspended portion protruding upward at a position corresponding to the center of gravity of the fluid device A in the pipe axis X direction. 8 is provided. The suspended portion 8 is attached to the lower end of the elevating shaft 41 of the elevating device B via the hanging connecting portion 42.

As shown in FIGS. 7, 8 and 11, each joint ring C has a semi-cylindrical shape divided into two in the circumferential direction of the pipe that can be fitted and mounted from both sides in the pipe radial direction with respect to the existing water pipe 1. It is composed of a split joint case 51. An annular seal mounting grooves 51a and 51b are formed on both side portions of the inner peripheral surface of the two split joint cases 51 in the pipe axis X direction. Among them, in the seal mounting groove 51a on one end side where the fluid device A is present, the outer peripheral surface of the first pipe connecting cylinder portion 3C of the first pipe connecting member 3 or the outer peripheral surface of the second pipe connecting cylinder portion 27 of the branch connecting pipe 2 A first packing 52 that seals between the surface and the surface is attached. A second packing 53 for sealing between the outer peripheral surface of one cutting pipe portion 1A or the outer peripheral surface of the other cutting pipe portion 1B is mounted on the seal mounting groove 51b on the other end side.

Further, as shown in FIGS. 8 and 11, at one end of the outer peripheral surface of the two split joint cases 51 in the pipe axis X direction, the bolt insertion hole 3b of the fifth connecting flange 3B in the first pipe connecting member 3 ( (See FIGS. 4 and 8), or a seventh connection having a bolt insertion hole 54a at a portion corresponding to the bolt insertion hole 28a (see FIG. 4) of the second connecting flange 28 in the branch connection pipe 2 in the pipe axis X direction. The flange 54 is integrally formed. At the other end of the outer peripheral surface of the two split joint cases 51 in the pipe axis X direction, an annular eighth connecting flange 55 in which a large number of bolt insertion holes 55a are formed along the circumferential direction at a predetermined pitch is provided. It is integrally formed.
As shown in FIG. 8, a third packing 56 is mounted between the inner peripheral surfaces of the two split joint cases 51 and the outer peripheral surfaces of the cut pipe portions 1A and 1B on the other end side in the pipe axis X direction. A tapered inner peripheral surface 51c that spreads outward is formed. The eighth connecting flange 55 of the double split joint case 51 is mounted between the tapered inner peripheral surface 51c of the double split joint case 51 and the outer peripheral surface of one cutting pipe portion 1A or the outer peripheral surface of the other cutting pipe portion 1B. A push ring 57 having a split structure for compressing the third packing 56 in a watertight state from the pipe axis X direction is connected.
Further, as shown in FIG. 8, the double split joint case 51 has an annular space 50 between the inner peripheral surface of the double split joint case 51 sealed by the packings 52 and 53 and the outer peripheral surface of the existing water pipe 1. A water injection port 58 for a watertightness test for supplying pressure water is formed in the water injection port 58, and a sealing plug 59 is screwed and attached to the water injection port 58.

Next, the housing H used in the fluid device installation method of the present invention will be described in detail.
As shown in FIG. 6, among the existing water pipes 1 located in the work pit constructed by excavation, the lower portion covering the lower half side of the work target area including the cutting machine and the double joint ring C which has been subjected to the hydraulic pressure test in advance. The upper connecting flange 71A of the cover 71 and the lower connecting flange 72A of the lower intermediate cover 72 covering the upper half side of the work target area are fixedly connected in a watertight state. The lower connecting flange 73A of the valve case 73 of the work on-off valve V3 is fixedly connected to the upper flange portion 72B of the lower intermediate cover 72 in a watertight state. The lower connecting flange 74A of the upper intermediate cover 74 forming the upper working space S2 that can selectively store the cutting machine and the fluid device A is watertight on the upper connecting flange 73B of the valve case 73 of the work on-off valve V3. It is fixedly connected in the state. The connecting flange 75A of the upper cover 75 that closes the upper opening of the upper intermediate cover 74 is fixedly and detachably fixedly connected to the upper connecting flange 74B of the upper intermediate cover 74 in a watertight state.

Further, as shown in FIGS. 6 and 7, the portions of the inner surface of the housing H that face each other in the branch axis Y direction at the position corresponding to the center of gravity of the fluid device A in the tube axis X direction are in the vertical direction. An elevating guide rail 76 is provided along the line. Therefore, the sixth connecting flange 6A of the second pipe connecting member 6 of the fluid device A carried into the upper working space S2 of the housing H is movably engaged with one of the elevating guide rails 76 facing the sixth connecting flange 6A. The first elevating guide portion 43 is provided. The mounting seat 23A of the branch connecting pipe 2 located opposite to the existing side of the second pipe connecting member 6 has a second elevating guide portion 44 movably engaged with the other elevating guide rail 76 facing the second elevating guide rail 76. It is provided.

Further, as shown in FIG. 6, the upper cover 75 of the housing H is lifted and lowered with respect to the housing H so that the position of the center of gravity of the fluid device A and the lifting center position of the lifting shaft 41 of the lifting device B match or substantially match. A mounting position changing means 45 for adjusting the mounting position of the shaft 41 in the horizontal direction is provided. The mounting position changing means 45 extends over a movable region from the vertical line passing through the pipe axis X of the existing water pipe 1 to the range of change in the center of gravity of the equipment to be suspended such as the fluid equipment A (suspension position adjustment operation range). Allows horizontal movement of the elevating shaft 41.

Next, a method for installing the fluid device using the above-mentioned fluid device A will be described.
[Pre-work process]
As a pre-work step of the fluid equipment installation method shown in FIGS. 6 and 7, a pipe cutting work step (not shown) is executed. In this pipe cutting work step, a cutting machine (not shown) attached to the existing water pipe 1 in the housing H cuts the pipe portion to be cut and removed of the existing water pipe 1 in a ring shape while the water is not interrupted. Since the cutting machine is preliminarily connected to the lower end of the elevating shaft 41 of the elevating device B, after cutting the pipe, the elevating shaft 41 is lifted by a lifting means such as a crane to cut while holding the cutting removal pipe portion. The machine is pulled up from the lower work space S1 in the housing H to the upper work space S2, and is finally suspended and transported to the outside of the housing H and removed.

[Equipment delivery process]
After the cutting machine is removed, the equipment loading step (not shown) of the fluid equipment installation method of the present invention is executed. In this equipment loading step, the upper intermediate cover 74 of the housing H is opened upward, and the work on-off valve V3 is in a closed state. A fluid device A is connected to the lower end of the elevating shaft 41 of the elevating device B, and an upper cover 75 for closing the upper opening of the upper intermediate cover 74 is attached to the elevating shaft 41.
Then, the elevating shaft 41 to which the fluid device A and the upper cover 75 are assembled is suspended and transported by a lifting means such as a crane, and the fluid device A is carried into the upper work space S2 from the upper opening of the upper intermediate cover 74. The first elevating guide portion 43 and the second elevating guide portion 44 of the carried-in fluid device A are a pair of elevating guide rails 76 provided at portions of the inner surface of the housing H facing each other in the branch axis Y direction. Is movably engaged with. After that, the connecting flange 75A of the upper cover 75 is fixedly connected to the connecting flange 75A of the upper cover 75 in a watertight state.

During this equipment loading step, as shown in FIG. 7, the valve body 32 of the first butterfly valve V1 of the fluid device A is set to the valve open state, and the valve body 32 of the first butterfly valve V1 is set to the valve closed state. ing. The opening angle of the valve body 32 of the first butterfly valve V1 is such that a part of the valve body 32 does not protrude to the outside from the first pipe connecting cylinder portion 3C of the first pipe connecting member 3 on the first butterfly valve V1 side. It is set.

Further, as shown in FIGS. 1 to 5, each of the valve box 31 of the first butterfly valve V1 and the valve box 31 of the second butterfly valve V2 has both connection end portions 31a and 31b configured in a flangeless structure. There is. Therefore, as shown in FIGS. 1 and 2, the valve box 31 of the first butterfly valve V1 is located between the first connecting flange 26 of the branch connecting pipe 2 and the fourth connecting flange 3A of the first pipe connecting member 3. It is held and fixed in a watertight state. Further, as shown in FIGS. 1 and 3, the valve box 31 of the second butterfly valve V2 is formed between the third connecting flange 29 of the branch pipe portion 25 and the sixth connecting flange 6A of the second pipe connecting member 6. It is held and fixed in a watertight state.

As described above, by using the first butterfly valve V1 having a flangeless structure, the total length of the fluid device A in the pipe axis X direction can be shortened as shown in FIG. Further, by using the second butterfly valve V2 having a flangeless structure, the total length of the fluid device A in the branch axis Y direction can be shortened.
Moreover, as shown in FIG. 7, the first pipe connecting member 3 for connecting the first butterfly valve V1 to the one cutting pipe portion 1A is used to connect the first pipe connecting member 3 to the first one. The first butterfly valve V1 can be sandwiched and fixed in a sealed state with the first connecting flange 26 of the portion 21. This makes it possible to simplify the mounting structure of the first butterfly valve V1 and the first pipe connecting member 3.
Further, as shown in FIGS. 1 and 3, a second pipe connecting member 6 for connecting the second butterfly valve V2 to the branch pipe (not shown) side is used to branch from the second pipe connecting member 6. The second butterfly valve V2 can be sandwiched and fixed in a sealed state with the second connecting flange 28 provided in the second connecting portion 24 of the connecting pipe 2. This makes it possible to simplify the mounting structure of the second butterfly valve V2 and the second pipe connecting member 6.

[Equipment installation process]
As shown in FIG. 6, after the work on-off valve V3 is opened, the elevating shaft 41 of the elevating device B is lowered, and the fluid device A is arranged between the cutting pipe portions 1A and 1B of the existing water pipe 1. .. In this state, the leg portion 46 provided at the lower end portion of the branch connection pipe 2 of the fluid device A is placed and supported on the receiving portion 47 provided on the bottom surface of the lower cover 71 of the housing H. As a result, the first pipe connecting cylinder portion 3C of the first pipe connecting member 3 on the first butterfly valve V1 side of the fluid device A and one cutting pipe portion 1A face each other in a concentric state. At the same time, the second pipe connecting cylinder portion 27 formed in the other first connecting portion 22 of the branch connecting pipe 2 of the fluid device A and the other cutting pipe portion 1A face each other in a concentric state.

Then, as shown in FIGS. 7 and 8, the first butterfly valve V1 and the second butterfly valve are provided in the branch connection pipe 2 of the fluid device A arranged between the two cutting pipe portions 1A and 1B of the existing water pipe 1. Since V2 is connected in advance, the branch connection pipe 2, the first butterfly valve V1 and the second butterfly valve V2 are arranged in a distributed state in the branch pipe (not shown) connected to the existing water pipe 1 and the fluid device A. Compared to the case where it is done, it can be constructed in one construction for the existing water pipe 1.
Moreover, as shown in FIG. 7, when the fluid device A is arranged, the first butterfly valve V1 is set to the valve open state and the second butterfly valve V2 is set to the valve closed state, so that the flow of clean water can be prevented. While maintaining the condition, the fluid device A can be accurately arranged between the cut pipe portions 1A and 1B of the existing water pipe 1. Since the second connection portion 24 of the branch connection pipe 2 can be closed by using the second butterfly valve V2, it is not necessary to attach a closing lid to the second connection portion 24.
Further, since the branch connecting pipe 2 does not have a valve function, the manufacturing cost can be reduced by simplifying the structure of the branch connecting pipe 2.

[Device connection process]
As shown in FIG. 7, each of the joint rings C mounted on both the cutting pipe portions 1A and 1B slides the joint ring C from the outside of the housing H to the connection position at the time of assembling the housing H in the previous work process. It is connected to a sliding operation tool 77 that operates dynamically. In this device connection step, each sliding operating tool 77 attached to the housing H is pushed in. As a result, the joint ring C mounted on one of the cutting pipe portions 1A is connected to the first pipe connecting cylinder portion 3C of the first pipe connecting member 3 on the first butterfly valve V1 side of the fluid device A in the pipe axis X direction. Fitted and connected from. The joint ring C mounted on the other cutting pipe portion 1A is connected to the second pipe connecting cylinder portion 27 formed in the other first connecting portion 22 in the branch connecting pipe 2 of the fluid device A in the pipe axis X direction. Fitted and connected from.

As shown in FIGS. 8 and 11, in a state where both joint rings C are fitted and connected at predetermined connection positions, the first packing 52 of one joint ring C is the first pipe of the first pipe connecting member 3. It comes into contact with the outer peripheral surface of the connection tube portion 3C. The second packing 53 of the one joint ring C comes into contact with the outer peripheral surface of the one cutting pipe portion 1A. As a result, the space between the first pipe connecting member 3 on the first butterfly valve V1 side and the one cutting pipe portion 1A is hermetically sealed.
The first packing 52 of the other joint ring C comes into contact with the outer peripheral surface of the second pipe connecting cylinder portion 27 of the branch connecting pipe 2. The second packing 53 of the other joint ring C comes into contact with the outer peripheral surface of the other cutting pipe portion 1B. As a result, the space between the second pipe connecting cylinder portion 27 of the branch connecting pipe 2 and the other cutting pipe portion 1B is sealed in a watertight state.

[Equipment fixing process]
As shown in FIGS. 8 to 11, the fifth connecting flange 3B of the first pipe connecting member 3 on the first butterfly valve V1 side and the seventh connecting flange 54 on one end side of the joint ring C are connected to the third fixing means 10. It is fastened and fixed by a plurality of third bolts 10A and third nuts 10B constituting the above.
Further, as shown in FIGS. 8 to 11, a third packing 56 is mounted between the tapered inner peripheral surface 51c of each joint ring C and the outer peripheral surface of the cutting pipe portion 1A, and the eighth connection of each joint ring C is made. A T-shaped fourth bolt 11 is inserted through the bolt insertion hole 55a of the flange 55 and the bolt insertion hole 57a of the push ring 57, and the fourth nut 12 is screwed into the fourth bolt 11 in contact with the back surface of the push ring 57. The push ring 57 compresses the third packing 56 into a watertight state by tightening the bolt.
As shown in FIGS. 8 to 11, an annular retaining ring 13 having a split structure having a bolt insertion hole 13a through which the tip end side of a plurality of fourth bolts 11 is inserted is provided in each of the cutting tube portions 1A and 1B. It is fixed to the outer peripheral surface by welding. The fifth nut 14 is screwed and fixed to the tip of the fourth bolt 11 protruding from the bolt insertion hole 13a of the retaining ring 13, and each joint ring C is clamped and fixed to the cutting pipe portions 1A and 1B. ..
The retaining ring 13, the fourth bolt 11, and the fifth nut 14 constitute a retaining fixing means 15 for preventing the relative detachment movement between the cutting pipe portions 1A and 1B and the fluid device A.

[Short pipe connection process]
As shown in FIGS. 9 and 10, after the fluid device A is connected to both the cutting pipe portions 1A and 1B, each of the sixth connecting flanges 6A of the second pipe connecting member 6 attached to the second butterfly valve V2. The bolt 81 is screwed and fixed in the screw hole 6b. A bolt insertion hole (not shown) formed in the ninth connecting flange 80A of the short pipe 80 on the branch pipe side is fitted into the screw-fixed bolt 81, and the nut 82 screwed into the protruding end of the bolt 81. By the tightening operation, the short pipe 80 is fixedly connected to the sixth connecting flange 6A on the second butterfly valve V2 side in a watertight state.

Next, an example of the water flow switching state of the fluid device A connected by the above-mentioned fluid device installation method will be described with reference to FIG.
FIG. 12A shows a water flow state on the main pipe side in which the valve body 32 of the first butterfly valve V1 is fully opened and the valve body 32 of the second butterfly valve V2 is fully closed. In this main water flow state, as shown by the flow of water indicated by the arrow, clean water flows from the other cutting pipe portion 1B to one cutting pipe portion 1A via the main pipe portion 23 of the fluid device A.
FIG. 12B shows a branch-side water flow state in which the valve body 32 of the first butterfly valve V1 is fully closed and the valve body 32 of the second butterfly valve V2 is fully opened. In this branch-side water flow state, as shown by the flow of water indicated by the arrow, clean water flows from the other cutting pipe portion 1B to the short pipe 80 on the branch pipe side via the branch pipe portion 25 of the fluid device A.
FIG. 12 (c) shows a three-way water flow state in which the valve body 32 of the first butterfly valve V1 is fully opened and the valve body 32 of the second butterfly valve V2 is fully opened. In this three-way water flow state, as shown by the flow of water indicated by the arrow, clean water flows from the other cutting pipe portion 1B to one cutting pipe portion 1A via the main portion 23 of the fluid device A at the same time. Water flows from the other cutting pipe portion 1B to the short pipe 80 on the branch pipe side via the branch pipe portion 25 of the fluid device A.

[Second Embodiment]
FIG. 13 shows another of the first pipe connecting member 3 attached to the connecting end portion 31b which can be arranged to face one of the cutting pipe portions 1A among the connecting end portions 31a and 31b of the valve box 31 of the first butterfly valve V1. An embodiment is shown. In the first pipe connecting member 3 of this other embodiment, the bolt insertion hole 3d is formed at a portion corresponding to the bolt insertion hole 26a of the first connecting flange 26 of the branch connection pipe 2 in the pipe axis X direction. The connecting flange 3D, the joint ring C attached to one of the cutting pipe portions 1A, and the first pipe connecting cylinder portion 3E that is fitted and connected in a sealed state from the pipe axis X direction are integrally provided.
The tenth connecting flange 3D is formed with a screw hole (not shown) for fixing and connecting to the seventh connecting flange 54 of the joint ring C with bolts and nuts. The screw holes are arranged in the circumferential direction in a state where the positions are inconsistent with each other by half a pitch with respect to the bolt insertion hole 3d.

The valve box 31 of the first butterfly valve V1 is held and fixed by the first fixing means 4 between the first connecting flange 26 of the branch connecting pipe 2 and the tenth connecting flange 3D of the first pipe connecting member 3. The first fixing means 4 is a first bolt inserted across the bolt insertion hole 26a of the first connecting flange 26 in the branch connecting pipe 2 and the bolt insertion hole 3d of the tenth connecting flange 3D in the first pipe connecting member 3. A 4A and a first nut 4B screwed into each of the protruding screw shafts on both ends of the first bolt 4A are provided.
Between the joint surface between one connection end 31a in the valve box 31 of the first butterfly valve V1 and the first connecting flange 26 of the branch connection pipe 2, and the other connection end in the valve box 31 of the first butterfly valve V1. A gasket 5 for sealing in a watertight state is interposed between the joint surfaces of the 31a and the tenth connecting flange 3D of the first pipe connecting member 3.
Since the other configurations are the same as the configurations described in the first embodiment, the same numbers as those in the first embodiment are added to the same configuration parts, and the description thereof will be omitted.

[Other embodiments]
(1) In the above-mentioned first embodiment, each of the first butterfly valve V1 and the second butterfly valve V2 has a flangeless structure, but each of the first butterfly valve V1 and the second butterfly valve V2 has a flange structure. It may be configured.

(2) In the above-mentioned first embodiment, the short pipe 80 as an example of the pipe line constituent member on the branch pipe side is attached to the sixth connecting flange 6A of the second pipe connecting member 6 attached to the second butterfly valve V2. However, other pipeline constituent members such as NS type pipes and K type pipes can be connected.

1 Existing pipe (existing water pipe)
1A Cutting pipe 1B Cutting pipe 2 Branch connecting pipe 3 1st pipe connecting member 3C 1st pipe connecting cylinder 6 2nd pipe connecting member 21 1st connecting part 22 1st connecting part 24 2nd connecting part 26 1st connection Flange 27 2nd pipe connection cylinder 31a Connection end 31b Connection end A Fluid equipment C Joint ring H Housing V Flow path switching part V1 1st butterfly valve V2 2nd butterfly valve

Claims (6)

In the housing that seals the cutting work area of the existing pipe, between the cutting pipe portions of the existing pipe cut in a continuous flow state, both first connecting portions that can be arranged to face the cutting pipe portions and the existing pipe. A fluid device including a second connecting portion that opens in an intersecting direction with respect to the pipe axis direction of the pipe, and a flow path switching portion that switches the flow direction of the fluid with respect to both the first connecting portions and the second connecting portion. It is a fluid equipment installation method of arranging and connecting the both cutting pipe portions of the existing pipe and the fluid equipment.
The fluid device includes a branch connection pipe having no valve function forming the first connection portion and the second connection portion.
The flow path switching unit includes a first butterfly valve and a second butterfly valve .
The first butterfly valve is sealed between the first connection portion of one of the branch connection pipes and the first pipe connection member provided with a pipe connection tube portion for connecting to the cutting pipe portion of one. Connected with
The second butterfly valve is connected in a sealed state between the second connection portion of the branch connection pipe and the second pipe connection member provided with a pipe connection cylinder portion for connecting to the branch pipe.
When the fluid device is arranged, the first butterfly valve is opened at an opening angle so that the valve body thereof does not protrude to the outside of the pipe connecting cylinder portion of the first pipe connecting member and the fluid flow can be maintained . Moreover, the valve body of the second butterfly valve is set to the closed state, and the valve body is set to the closed state.
The pipe connecting tube portion of the first pipe connecting member of the fluid device is connected to the cutting tube portion of one of the existing pipes, and the other first connecting portion of the fluid device is the other of the existing pipes. A method for installing a fluid device connected to the cutting pipe portion of the above. The first pipe connecting member includes a fourth connecting flange that is bolted from the pipe axis direction to a first connecting flange provided in the first connecting portion of one of the branch connecting pipes, and one of the cutting pipes. The fifth connecting flange, which is bolted to the connecting flange of the joint ring mounted on the portion from the pipe axis direction, and the fifth connecting flange, which are integrally projected from the outer side of the fifth connecting flange in the tube axis direction. The pipe connecting cylinder portion is provided with a pipe connecting cylinder portion, and the pipe connecting cylinder portion of the first pipe connecting member is fitted with the joint ring in a sealed state from the pipe axis direction by an operation of moving the joint ring to the fluid device side. The method for installing a fluid device according to claim 1, which is coupled and connected. A tube connecting tube portion for connecting to the other cutting tube portion is formed in the other first connecting portion of the branch connecting tube, and this tube connecting tube portion is attached to the other cutting tube portion. The method for installing a fluid device according to claim 1 or 2, wherein the splicing wheel is fitted and connected to the splicing wheel in a sealed state from the direction of the pipe axis by moving the splicing wheel to the fluid device side. The fluid device installation method according to any one of claims 1 to 3, wherein each of the first butterfly valve and the second butterfly valve has a flangeless structure at both connecting ends. The fluid device used in the fluid device installation method according to any one of claims 1 to 4, wherein the branch having no valve function forming both the first connecting portion and the second connecting portion. A connecting pipe is provided, and the flow path switching unit includes a first butterfly valve and a second butterfly valve.
The first butterfly valve is between the first connecting portion of one of the branch connecting pipes and the first pipe connecting member provided with the pipe connecting cylinder portion for connecting to the cutting pipe portion of one. Connected in a sealed state,
The second butterfly valve is connected in a sealed state between the second connecting portion of the branch connecting pipe and the second pipe connecting member provided with the pipe connecting cylinder portion for connecting to the branch pipe. The valve body of the first butterfly valve can open and close the inside of the first pipe connecting member, and maintains the fluid flow without protruding to the outside of the pipe connecting cylinder portion of the first pipe connecting member. A fluid device that is configured to be configurable to a valve open state with a possible opening angle . The first pipe connecting member includes a fourth connecting flange that is bolted from the pipe axis direction to a first connecting flange provided in the first connecting portion of one of the branch connecting pipes, and one of the cutting pipes. The fifth connecting flange, which is bolted to the connecting flange of the joint ring mounted on the portion from the pipe axis direction, and the fifth connecting flange, which are integrally projected from the outer side of the fifth connecting flange in the tube axis direction. The fluid device according to claim 5 , further comprising a tube connection tube portion .

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