JP6019498B2 - Fluid equipment replacement method - Google Patents

Description

  In the present invention, the upstream portion of the gate valve connected to the fluid pipe communicates with a through hole formed in the fluid pipe, and is divided and fixed to the fluid pipe in a sealed state with an elastic sealant. Replace the existing fluid equipment with fluid equipment that is externally fixed to the fluid pipe by welding with the through-holes closed in the fluid transport path where the existing fluid equipment with the equipment body is provided. The present invention relates to a method for replacing fluid equipment.

In such a fluid device laying replacement method, an existing fluid device communicates with a through-hole formed in the fluid pipe, and is divided and fixed to the fluid pipe in a sealed state with an elastic sealing material. It has.
Specifically, for example, as shown in Patent Document 1, an existing gate valve device as an example of an existing fluid device is formed from a pipe radial direction through a plurality of bolts and nuts with respect to the outer peripheral surface of the fluid pipe. A partially cylindrical device main body divided into a plurality of pipes in the outer circumferential direction, and a tubular portion projecting upward from one of the split device main bodies and having a connecting flange at the upper end; And a valve box having a connecting flange part detachably attached to the connecting flange part of the tubular part via bolts and nuts, and a valve body fixed to a spindle shaft penetrating the valve box.

When attaching an existing gate valve device to a fluid pipe, first, with the tubular part facing upward, the device body with a split structure is sheathed on the fluid pipe, and the perforating device is fixed to the connecting flange part of the tubular part By connecting, a circular through hole is formed in the outer peripheral surface of the fluid pipe via the tubular portion. Then, by removing the punching device from the connecting flange portion of the tubular portion, connecting the valve box having the valve body, and rotating the spindle shaft, the valve body is connected between the valve box and the fluid pipe through the through hole. The flow path in the fluid pipe is configured to be freely opened and closed by a valve body having a packing.
Further, in the state where the device main body of the existing gate valve device is sheathed on the fluid pipe, the elastic seal material surrounds and seals the periphery of the through hole formed in the fluid pipe, and the elastic seal material is It is configured to be mounted and sealed between the inner surface of the device main body and the outer peripheral surface of the fluid pipe, and between the device main bodies having a divided structure.

JP-A-11-230376

Here, as described above, the periphery of the through-hole formed in the fluid pipe, between the inner surface of the device body and the outer peripheral surface of the fluid tube, and between the device bodies of the divided structure are sealed with an elastic sealing material. However, an aqueous solution containing a chemical substance such as ammonia or a liquid such as clean water flows at various temperatures in the flow path of the fluid pipe constituting the fluid transport path.
For this reason, when an existing gate valve device is externally attached to a fluid pipe for a long period of time and an elastic sealing material formed of rubber or the like is exposed to moisture, chemical substances, various temperatures, or the like for a long period of time, it deteriorates. As a result, the water stoppage is lowered and the fluid in the fluid pipe may leak out. In addition, it is necessary to periodically replace the deteriorated elastic sealing material, and there is a problem that a construction cost and a construction period for the replacement are required.

  On the other hand, when the equipment main body of the existing gate valve device is sheathed on the fluid pipe, the inner surface of the equipment main body and the outer peripheral surface of the fluid pipe are not sealed with an elastic sealing material that may reduce the water stoppage. It is also conceivable to directly weld and seal the inner surface of the device main body and the outer peripheral surface of the fluid pipe.

However, even when the device main body of the existing gate valve device is sheathed on the outer peripheral surface of the fluid pipe, the fluid flows through the flow path of the fluid pipe, so the inner surface of the device main body and the outer peripheral surface of the fluid pipe If a hole or the like is opened in the fluid pipe when the operation of welding the two is performed, there is a possibility that the fluid may be ejected from the fluid pipe. In addition, even if the hole is not opened, the welding work requires extreme caution, so there is a risk that the construction period will be delayed.
In addition, the problem when welding the main body of the existing gate valve device directly to the outer peripheral surface of the fluid pipe is another fluid device (an example of fluid equipment) instead of the main body of the existing gate valve device. The same problem arises when the main body of the gate valve device is directly welded to the outer peripheral surface of the fluid pipe.

  The present invention has been made in view of such circumstances, and its purpose is to ensure that fluid leakage is ensured over a long period of time in a state where the existing fluid equipment is replaced with fluid equipment and the fluid equipment is externally mounted on the fluid pipe. It is another object of the present invention to provide a fluid device replacement method that can reliably prevent, easily, quickly, and safely perform the operation of welding another fluid device to a fluid pipe.

In order to achieve the above object, the fluid device laying / replacement method according to the present invention is in communication with a through hole formed in the fluid pipe at an upstream side portion of a gate valve connected to the fluid pipe, and the fluid In a fluid transport path in which an existing fluid device having a split structure device body that is externally fixed in a sealed state with an elastic sealant to a pipe is provided, the existing fluid device is closed with the through hole In this state, the fluid device is replaced with a fluid device that is externally fixed to the fluid pipe by welding, and the characteristic configuration is in the following steps (a) to (e).
(B) An expansion blockage that can be inserted into the gate valve up to a pipeline blockage scheduled position upstream of the existing fluid device in the fluid pipe and that closes the flow path by a rubber expansion operation on the tip side. Connecting a flow path closing device with means,
(B) the fluid pipe is connected to the fluid pipe between the fluid pipe closed portion by the expansion block means of the flow passage closing device or between the flow passage closed portion and the exterior fixing portion of the existing fluid device. A process of mounting a cooling device for cooling;
(C) removing a part or all of the existing fluid device in a state in which the flow path blocking portion of the fluid pipe is closed by the expansion blocking means of the flow path closing device;
(D) cooling the portion where the cooling device is sheathed in the fluid pipe with the cooling device, and fixing the fluid equipment in a sealed state by welding to the fluid pipe with the through hole closed;
(E) A step of removing the flow path closing device and the cooling device.

  According to the above characteristic configuration, the existing fluid device is replaced with a fluid device, and the fluid device can be reliably prevented from leaking over a long period of time while the fluid device is externally fixed to the fluid pipe. The work of welding to the pipe can be performed reliably, simply, quickly and safely.

Specifically, in the state where the fluid is flowing through the fluid pipe of the fluid transport path in which the gate valve and the existing fluid device in the upstream portion of the gate valve are provided, the expansion blocking means is provided downstream of the gate valve. The flow path closing device provided with a seal is connected in a sealed state, and the rubber on the distal end side of the expansion closing means is inserted to the planned line closing position upstream of the existing fluid device through the gate valve and the existing fluid device. Then, the rubber can be inflated, and the flow passage blocking portion of the fluid pipe can be closed by the expansion blocking means.
As a result, in the fluid pipe, the flow of fluid is blocked at the upstream side of the flow path blockage site, and the flow of fluid is blocked at the downstream side where the gate valve and the existing fluid device are provided. A part or all of the existing fluid equipment can be removed, and the fluid equipment can be externally fixed to the fluid pipe by welding with the through hole of the fluid pipe closed.

  In addition, since the cooling device for cooling the fluid pipe is mounted on the fluid pipe between the channel blockage site or the channel blockage site and the exterior fixing site of the existing fluid device, at least the fluid flow is blocked. It is possible to cool the fluid pipe at the exterior fixing portion of the existing fluid device on the downstream side of the flow path blocking portion. At this time, since the fluid does not flow in the fluid pipe on the downstream side of the portion where the cooling device is sheathed, the cooling heat from the cooling device can be effectively used to cool the fluid pipe.

As described above, the fluid equipment is provided on the outer peripheral surface of the fluid pipe at the place (the exterior fixing place of the existing fluid equipment) communicating with the through hole of the fluid pipe in a state where the fluid in the fluid pipe is shut off and the fluid pipe is cooled. Can be directly welded and fixed in a sealed state.
As a result, the temperature rise of the fluid pipe and the fluid equipment due to the heat generated by welding can be prevented well, and even if a hole or the like is opened in the outer peripheral surface of the fluid pipe by welding work, the fluid in the fluid pipe is ejected to the outside. The welding operation can be performed reliably, simply, quickly and safely.
In particular, since the expanded rubber is in close contact with the inner surface of the fluid pipe on the upstream side of the part where the cooling device is installed, heat generated by welding is transferred to the rubber through the fluid pipe. Even if the heat is transferred to the rubber, the rubber can be cooled by the cooling heat of the cooling device, and the water stopping performance by the rubber can be stabilized.

  Furthermore, the fluid equipment can be securely fixed in a sealed state to the outer peripheral surface of the fluid pipe by welding without using an elastic sealing material, and leakage of fluid can be reliably prevented over a long period of time.

A further characteristic configuration of the fluid device installation / replacement method according to the present invention is that, in the step (c), a part or all of the existing fluid device is removed to configure another fluid device as the fluid equipment. Construct the device body of the split structure to the fluid pipe in an exterior state,
In the step (d), the portion where the cooling device is sheathed is cooled by the cooling device, and the device main body of the other fluid device constructed in the fluid pipe is sealed to the fluid pipe by welding. The other fluid device is constructed by assembling the remaining device constituent members in a sealed state to the device body of the other fluid device that is fixed to the exterior and welded.

  According to the above characteristic configuration, after the equipment body of another constructed fluid device (an example of fluid equipment) is externally fixed to the fluid pipe in a sealed state by welding, the remaining device components are sealed in the device body. Since it assembles, the temperature rise of the said apparatus structural member by the heat which generate | occur | produced by welding can be prevented favorably.

  A further characteristic configuration of the fluid device replacement method according to the present invention is that the device main body in another fluid device as the fluid equipment is provided with a tubular portion communicating with the through hole of the fluid tube. The other fluid device in which the plug that holds the sealing means for sealing the through hole of the fluid pipe in a state operable from the outside is screwed and attached to the screw portion provided on the inner surface of the part in a sealed state, and is welded After performing a sealing test by supplying a pressure fluid into a closed space sealed by the plug and the sealing means between the inner surface of the device main body and the outer peripheral surface of the fluid pipe, the plug and the sealing And the lid member which is the remaining device constituent member is screwed and attached to the screw portion of the tubular portion in a sealed state.

According to the above characteristic configuration, the tubular portion communicating with the through hole of the fluid pipe is provided in the device body of another fluid device, and the through hole of the fluid pipe is sealed to the screw portion provided on the inner surface of the tubular portion. A plug that holds the sealing means that can be operated from the outside is screwed and attached in a sealed state, and the plug and the sealing means are interposed between the inner surface of the device body of another fluid device and the outer peripheral surface of the fluid pipe that are welded. The pressure test is performed by supplying the pressure fluid into the closed space that is sealed in the above-described manner. Therefore, the seal test can be reliably performed with a simple configuration in which the device main body is provided with the plug and the sealing means.
In particular, after conducting the sealing test, the plug and the sealing means are removed from the threaded portion of the tubular portion of the device body, and the lid member which is the remaining device component member is screwed and attached to the threaded portion in a sealed state. Therefore, the through hole of the fluid pipe can be easily sealed, and the screw part can be used for screwing and mounting the lid member and the plug in the sealing test, thereby simplifying the configuration of the device body. Can do.

A further characteristic configuration of the fluid device laying replacement method according to the present invention is such that the cooling device is externally mounted on the flow path blocking portion of the fluid pipe by the expansion blocking means of the flow path closing device,
The cooling region length in the tube axis direction by the cooling device is configured to be larger than the blocking length in the tube axis direction by the expansion blocking means of the flow path closing device.

According to the above-described characteristic configuration, the cooling device is externally mounted on the flow passage blocking portion of the fluid pipe by the expansion and closing means, and the cooling region length in the tube axis direction of the fluid pipe by the cooling device is the pipe of the fluid pipe by the expansion and closing means. Since it is configured to be longer than the blocking length in the axial direction, the rubber that is provided at the tip of the expansion blocking means and is expanded at the flow path blocking portion is always positioned in the cooling region by the cooling device. Can do.
As a result, heat generated by welding can be further prevented from being transferred to the rubber via the fluid pipe, and even if the heat is transferred to the rubber, the rubber is further cooled by the cold heat from the cooling device. It is possible to further stabilize the water stopping performance by rubber.

  A further characteristic configuration of the fluid device replacement method according to the present invention is that the flow passage blockage portion by the expansion blockage means of the flow passage blockage device is biased to the side away from the through hole in the cooling region by the cooling device. The cooling point is set.

  According to the above characteristic configuration, the flow path blockage part by the expansion blockage means is set to a cooling part that is biased away from the through hole in the cooling region by the cooling device. The heat generated when welding the device main body to the fluid pipe can be further prevented from being transferred to the rubber via the fluid pipe. Even if the heat is transferred to the rubber, the cooling device The rubber can be further cooled by cold heat, and the water stopping performance of the rubber can be further stabilized.

  A further characteristic configuration of the fluid device installation / replacement method according to the present invention is that the device main body of the other fluid device is combined with the main part of the device main body of the existing fluid device.

According to the above characteristic configuration, the device main body of another fluid device is configured to share the main portion of the existing fluid device main body, so that the main portion of the existing fluid device main body is left in the fluid pipe. The other fluid device can be constructed by assembling the remaining device components other than the device body of the other fluid device in a sealed state.
Therefore, it is possible to update to another fluid device while effectively using the device body of the existing fluid device, to make both fluid devices simple, and to reduce the construction cost and the construction period. .

  A further characteristic configuration of the fluid equipment replacement method according to the present invention is that the existing fluid equipment is a work gate valve installed at the time of renewal of the gate valve, and serves as a device body that is externally mounted on the fluid pipe. A valve box having a split structure and a valve lid having a valve body that is detachably mounted from a valve body mounting port of the valve box are provided.

According to the above characteristic configuration, since the existing fluid device is a work gate valve installed when the gate valve is updated, the fluid upstream of the gate valve by the valve body of the work gate valve before the gate valve is updated. By blocking the flow path in the pipe, the flow of the fluid on the upstream side of the work gate valve is maintained, while the flow of the fluid on the downstream side is blocked, and the gate valve can be updated to another gate valve. it can.
Further, the work gate valve is provided with a split structure valve box as a device main body that is externally mounted on the fluid pipe, and a valve lid having a valve body that is detachably mounted from a valve body mounting port of the valve box. Therefore, for example, both the valve box and the valve lid are removed, and the equipment body of another fluid device (the valve box of another working gate valve) communicating with the through hole of the fluid pipe is attached to the fluid pipe in the exterior state. After that, another fluid device can be constructed by assembling the remaining device components in a sealed state on the device main body (the valve body mounting opening of the valve box of another work gate valve), or Remove only the lid, and construct the equipment body of another fluid device (the valve box of the existing work gate valve) communicating with the through hole of the fluid pipe in the exterior state on the fluid pipe. Install the remaining equipment components in a sealed state on the valve body opening of the valve gate of the working gate valve in a sealed state. It is possible to build the vessel.

Schematic longitudinal sectional view around the fluid pipe connected to the main pipe and the existing gate valve Schematic longitudinal sectional view showing a state in which a valve box and a press ring member are externally mounted between the main pipe and the existing gate valve A schematic longitudinal sectional view showing a state in which a valve box, a valve lid, and a push ring member are externally mounted between the main pipe and the existing gate valve, and the flow path of the fluid pipe is closed by the valve body. Schematic exploded perspective view of valve box and push ring member Schematic longitudinal sectional view showing a state where the flow path closing device is connected to the downstream side of the existing gate valve Schematic longitudinal sectional view showing a state in which the expansion block means of the flow path closing device is located at the planned flow path closing position Schematic longitudinal sectional view showing a state in which the expansion block means is inflated and the flow path in the fluid pipe is closed A schematic longitudinal cross-sectional view showing a state in which the fluid pipe is cooled by the cooling device, the sealing means is fitted and positioned in the hole, and another valve box is welded to the fluid pipe by welding. Schematic exploded perspective view of sealing test equipment Cross-sectional view showing the outline of the sealing test by the sealing test equipment Schematic longitudinal sectional view showing a state where a lid member is mounted on another welded valve box Schematic external view showing a state in which a lid member is attached to another welded valve box Schematic longitudinal sectional view showing a state where a lid member is mounted on another welded valve box A schematic longitudinal sectional view showing a state in which a valve box and a valve lid are externally mounted between a main pipe and an existing gate valve, and a flow path of a fluid pipe is closed by a valve body. Schematic longitudinal sectional view showing a state where the flow path closing device is connected to the downstream side of the existing gate valve Schematic longitudinal sectional view showing a state in which the expansion block means of the flow path closing device is located at the planned flow path closing position Schematic longitudinal sectional view showing a state in which another casing is welded to the fluid pipe by welding in a state where the expansion block means is inflated and the flow path in the fluid pipe is closed. Schematic longitudinal sectional view showing a state where a lid member is mounted on another welded valve box Schematic longitudinal sectional view showing a state where a lid member is mounted on another welded valve box

[First Embodiment]
Hereinafter, based on FIGS. 1-13, the fluid apparatus cloth replacement method which concerns on 1st Embodiment of this invention is demonstrated.

As shown in FIG. 1, the fluid transport path includes at least a main pipe 1 and a fluid pipe 2 branched from the main pipe 1, and the main pipe 1 and the flow path in the fluid pipe 2 include a main pipe. From 1 to each fluid pipe 2, clean water (an example of a fluid) W having a temperature higher than room temperature flows. The fluid can be exemplified by liquids having various temperatures, such as aqueous solutions containing chemical substances such as ammonia and liquids such as clean water.
The fluid pipe 2 is a metal pipe such as a cast iron pipe or a steel pipe, and the fluid pipe 2 is provided with an existing gate valve 3 (an example of a gate valve) at a location downstream of the location connected to the main pipe 1. ) Is flanged.
The existing gate valve 3 includes a valve body 3a capable of blocking the flow path in the fluid pipe 2, and an upstream flange portion 3b that can be fixedly connected to the upstream flange portion 2A of the fluid pipe 2 via bolts 4 and nuts 5. The downstream flange portion 2B of the fluid pipe 2 is provided with a downstream flange portion 3c that can be fixedly connected via a bolt 4 and a nut 5.

  As shown in FIG. 2, first, while maintaining the flow of the fluid in the main pipe 1 and the fluid pipe 2, a portion of the fluid pipe 2 between the main pipe 1 and the existing gate valve 3 (upstream of the gate valve). A work gate valve (an example of an existing fluid device) 6 is externally fixed to the side portion in a sealed state. At this stage, only the valve box 7 of the work gate valve 6 described later is mounted on the fluid pipe 2.

The work gate valve 6 includes a split-structure valve box (an example of an apparatus main body of an existing fluid device) 7 and a valve body mounting opening (an example of a tubular part) 8 of the valve box 7. And a valve lid 10 having a valve body 9 that is detachably mounted (see FIG. 3).
As shown in FIGS. 2 to 4, the valve box 7 is divided into upper and lower parts in a pipe circumferential direction that can be sheathed from the pipe diameter direction through a plurality of bolts 11 and nuts 12 with respect to the outer circumferential surface of the fluid pipe 2. A semi-cylindrical divided valve box 7a, and a valve body mounting port 8 formed on one divided valve box 7a of each divided valve box 7a so as to protrude radially outward (upward) of the fluid pipe 2. And. An insertion hole 7f through which a later-described valve body 9 can be inserted is formed in a portion where the valve body mounting port portion 8 is formed in the semi-cylindrical portion of the divided valve box 7a.

The semi-cylindrical portion of the divided valve box 7a that is externally mounted on the outer peripheral surface of the fluid pipe 2 has an inner peripheral surface that is slightly larger in diameter than the outer peripheral surface of the fluid pipe 2. A predetermined gap is formed between the inner peripheral surface of each divided valve box 7 a and the outer peripheral surface of the fluid pipe 2 in the state of being covered with the pipe 2. Further, in the semi-cylindrical portion of the upper divided valve box 7a among the divided valve boxes 7a, the predetermined gap and the outside are located at positions separated from the valve body mounting port 8 in the tube axis X direction. 7 g is provided so that water for sealing test (an example of pressure fluid) can flow from the outside.
At both ends of the fluid pipe 2 in the tube axis X direction of the semi-cylindrical portion of each divided valve box 7a, the valve body mounting port portion 8 is protruded from the part formed and protruded along the tube axis X direction. As a result, a tapered surface 7e whose diameter increases is formed.
In addition, each divided valve box 7a is configured such that end surfaces along the tube axis X direction are in contact with each other in the vertical direction in a state where the divided valve box 7a is sheathed on the fluid pipe 2, and is separated upward or downward from each end surface. A plurality of connecting plate portions 7b extending in the horizontal direction from the portion thus formed are provided. A pair of connecting plate portions 7b is provided at each of both end portions in the tube axis X direction of each divided valve box 7a (in FIG. 4, four are provided for each divided valve box 7a). Each connecting plate portion 7b is provided with an insertion hole 7c penetrating in the vertical direction through which the bolt 11 can be inserted.
Therefore, when the divided valve boxes 7a are externally attached to the fluid pipe 2 in a state where the end faces along the tube axis X direction are in contact with each other in the vertical direction, the connecting plate portions 7b to be connected to each other are connected in the vertical direction. Since the bolts 11 and the nuts 12 inserted into the insertion holes 7c are tightened and connected with a predetermined gap between the opposed surfaces, the divided valve boxes 7a are connected to each other through the predetermined gap in a side view. The abutting end surface is configured to be exposed to the radially outward side of the divided valve box 7a. That is, even in a state where the connecting plate portions 7b are fastened and fixed by the bolts 11 and the nuts 12, the end surfaces where the divided valve boxes 7a abut against each other through the predetermined gap are welded from the side of the divided valve box 7a. It is configured to be possible.

  Further, the connecting plate portion 7b is formed with a female screw portion 7d to which a bolt 14 for connecting and fixing a presser wheel member 13 to be described later can be screwed and attached from the tube axis X direction. The female screw portion 7d is formed only on one of the connecting plate portions 7b of the pair of connecting plate portions 7b provided at both ends in the tube axis direction X of each divided valve box 7a. It is formed at a position facing the tube axis X as viewed in the X direction.

  The push ring member 13 is divided into a pair of divided push ring bodies 13a (FIG. 3) that are divided into two in the pipe circumferential direction that can be sheathed in a watertight state from the pipe radial direction via a plurality of bolts 17 with respect to the outer circumferential surface of the fluid pipe 2. In each of the divided pusher bodies 13a, two divided pusher bodies 13a arranged on both sides in the tube axis X direction and the upper and lower divided pusher bodies 13a are sheathed on the fluid pipe 2. The substantially annular elastic sealing material 13b that seals between the peripheral surface, the outer peripheral surface of the fluid pipe 2, and the tapered surface 7e of the divided valve box 7a, and the movement of each divided pusher body 13a in the tube axis X direction are prevented. The movement prevention part 13c is provided.

Each split pusher body 13a is formed with a through hole 15 penetrating in the vertical direction and a female screw portion 16 formed at a position facing the through hole 15 in the vertical direction, and the bolt 17 is passed through the through hole 15. By screwing into the female screw portion 16, the divided pusher body 13a divided into two in the vertical direction can be connected and fixed via the sealing material 13d.
Further, each divided pusher body 13a is formed with a through hole 18 penetrating in the tube axis X direction at a location corresponding to the female screw portion 7d of the connecting plate portion 7b (in the vicinity of the formation location of the female screw portion 16). The bolts 14 are inserted into the through holes 18 and screwed into the female screw portions 7d, so that each divided pusher body 13a is placed at the end of the semi-cylindrical portion of the divided valve box 7a in the tube axis X direction. Can be connected and fixed.
Thus, in the state where each of the pair of divided pusher bodies 13a is positioned at each end of the semi-cylindrical portion of the divided valve box 7a and attached to the fluid pipe 2, as described above, the elastic seal member 13b is used. The tapered inner peripheral surface of each divided pusher body 13a, the outer peripheral surface of the fluid pipe 2, and the tapered surface 7e of the divided valve box 7a are sealed.
Further, each split pusher body 13a is provided with a female screw hole 19 penetrating in the vertical direction. As described above, in the state where each split pusher body 13a is mounted on the fluid pipe 2, By screwing the male screw member 20, the biting claw 20 a formed at the tip of the male screw member 20 bites into the outer peripheral surface of the fluid pipe 2, so that each divided pusher body 13 a moves in the tube axis X direction. The movement is prevented, and the movement of each divided valve box 7a in the tube axis X direction is also prevented. Note that the male screw member 20 and the female screw hole 19 function as the above-described movement blocking portion 13c.

  An annular flange 8 a is formed at the upper end portion of the valve body mounting port portion 8, and a female screw portion (an example of a screw portion) 8 b is provided at an upper portion of the inner surface of the valve body mounting port portion 8.

The valve lid 10 is formed in a substantially bottomed cylindrical shape, and a screw shaft 10a is rotatably inserted in an upper bottom portion in a sealed state. The screw shaft 10a can be rotated at the upper end portion of the screw shaft 10a. The handle 10b is provided in a state protruding from the valve lid 10, and the valve body 9 is screwed to the lower end portion of the screw shaft 10a. Further, a male screw portion 10c that can be screwed onto the female screw portion 8b of the valve element attaching port portion 8 is formed at the lower end portion of the valve lid 10, and the valve element is further below the male screw portion 10c. An O-ring 10 d that seals between the inner surface of the mounting opening 8 is provided.
The valve body 9 is formed in a shape that allows a seal member (not shown) to be attached to the distal end portion so as to block the flow path in the fluid pipe 2, and the base end portion is screwed to the lower end portion of the screw shaft 10a. Has been.

  Therefore, when the work gate valve 6 having such a configuration is externally sealed on the fluid pipe 2, first, a portion of the fluid pipe 2 between the main pipe 1 and the existing gate valve 3 (upstream of the gate valve). In the part), each divided valve box 7a is externally mounted, and the end faces along the tube axis X direction of each divided valve box 7a are in contact with each other in the vertical direction. It welds and the connection of the volt | bolt 11 and the nut 12 which were penetrated by the insertion hole 7c of the connection board part 7b is cancelled | released. Thereafter, a pair of split pusher bodies 13a are externally fixed to the fluid pipes 2 positioned at both ends of the semi-cylindrical portion of each split valve box 7a, connected and fixed from the tube axis X direction, and a movement blocking portion. 13c prevents movement of each divided pusher body 13a and each divided valve box 7a in the tube axis X direction.

Although not shown in the figure because it is a known configuration, the fluid pipe is inserted through the insertion hole 7f of the divided valve box 7a by a hole saw of a piercing device connected and fixed to the valve body mounting port 8 in an uninterrupted and sealed state. 2 is formed with a circular perforation port 2a, the perforation device is removed from the valve body mounting port portion 8, and the male screw portion 10c of the valve lid 10 is attached to the female screw portion 8b of the valve body mounting port portion 8. Screw it on.
Thereafter, the handle 10b is rotated, the valve body 9 is slid downward by the rotation of the screw shaft 10a, and the flow path in the fluid pipe 2 is blocked (see FIG. 3).

  Next, as shown in FIG. 5, in the state where the flow of the fluid in the fluid pipe 2 on the downstream side of the work gate valve 6 is blocked, the bolt 4 and the nut 5 are loosened, and the upstream flange portion 2 </ b> A of the fluid pipe 2. And the upstream flange portion 3b of the existing gate valve 3 are released, and the existing gate valve 3 is removed, and then the new gate valve 21 is connected to the upstream flange portion 2A of the fluid pipe 2 via the bolt 4 and the nut 5. The upstream flange portion 21A is connected and fixed. The new gate valve 21 is configured in substantially the same manner as the existing gate valve 3, and includes a valve body 21a, an upstream flange portion 21A, and a downstream flange portion 21B.

  And the connection flange part 31A of the flow-path closing device 30 mentioned later is connected and fixed to the downstream flange part 21B of the new gate valve 21 with the volt | bolt 4 and the nut 5. FIG.

  The channel closing device 30 includes a bottomed cylindrical closing case 31 having a connecting flange portion 31A, a bottom wall portion 31B of the closing case 31, and a central portion of the bottom wall portion 31B in a watertight state in the axial direction (tube A cylindrical outer operation shaft 32 that slidably penetrates in the axial direction X), an inner operation shaft 33 that slidably penetrates the outer operation shaft 32 in the axial direction, the outer operation shaft 32 and the inner operation. On the distal end side of the shaft 33, there are provided expansion and closing means 34 for blocking the flow path in the fluid pipe 2, and operation means 35 for operating the expansion and closing means 34 from the outside via both operation shafts 32 and 33. Yes.

  The inner operation shaft 33 is disposed on the proximal end side and has a screw shaft portion 33A having an external thread portion 33a on the outer peripheral surface, and a shaft disposed on the distal end side of the inner operation shaft 33 and connected to the distal end side of the screw shaft portion 33A. Part 33B.

  In the expansion and closing means 34, a first pressing plate 36 having an annular pressing surface 36 a is fitted and fixed to the distal end portion of the outer operation shaft 32, and the first pressing plate 36 is fixed to the distal end portion of the inner operation shaft 33. A second pressing plate 37 having an annular pressing surface 37a opposite to the pressing surface 36a in the axial direction is externally fitted and fixed, and between the pressing surfaces 36a, 37a of both pressing plates 36, 37. Then, due to the clamping pressure from the axial direction by these, it is elastically deformed into an expanded state in close contact with the inner peripheral surface of the fluid pipe 2, and the outer peripheral portion between both the pressing plates 36, 37 and the inner peripheral surface of the fluid pipe 2. A rubber expansion elastic body 38 made of rubber that closes the gap and blocks the flow path in the fluid pipe 2 is covered (see FIG. 7).

The operation means 35 is supported on the male screw portion 33a of the screw shaft portion 33A of the inner operation shaft 33 in a state where the operation means 35 is supported so as to be relatively rotatable with respect to the outer operation shaft 32 at a position where it abuts on the base end of the outer operation shaft 32. An operation nut 32A having a female screw portion 32b to be screwed is provided.
Accordingly, when the operation nut 32A that is in contact with the base end of the outer operation shaft 32 is externally tightened and rotated around the axis using an operation member (not shown), the screw shaft portion 33A and the shaft portion 33B are moved to the outer operation shaft. 32, which slides so as to come out to the proximal end side, and is sandwiched by the proximity movement of the pressing surface 36a of the first pressing plate 36 with respect to the pressing surface 37a of the second pressing plate 37 externally fixed to the distal end of the shaft portion 33B. Due to the pressure action, the elastic body 38 for expanding the diameter in an uncompressed state is elastically deformed into an expanded state in close contact with the inner peripheral surface of the fluid pipe 2, and the flow path in the fluid pipe 2 can be shut off in a sealed state. .

A pair of brackets 39 are fixed to the base end portion of the outer operation shaft 32 by a pair of butterfly bolts 40. The base end sides of the pair of brackets 39 (on the side opposite to the butterfly bolt 40 in the axial direction) are clamped and supported by bolts 42 and nuts 43 with a pulley 41 disposed between the pair of brackets 39. ing. The pulley 41 is configured to be rotatable around the bolt 42. The closing case 31 is provided with a pair of locking rings 31C projecting radially outward from the closing case 31. A lever block (registered trademark, 44 is connected, a hook member (not shown) is connected to the other locking ring 31C, and a chain 45 is laid across the lever block 44 and the other locking ring 31C via the pulley 41. Has been passed.
Therefore, the chain 45 is wound up to the tightening side by the lever block 44, and the outer operation shaft 32 and the inner operation shaft 33 are pushed in along the shaft core (tube shaft core X) via the pair of brackets 39. The blocking means 34 can be inserted into the fluid pipe 2 against the fluid pressure in the pipe 2. That is, the pair of brackets 39, the butterfly bolt 40, the pulley 41, the lever block 44, the chain 45 and the like function as the operation means 35.

  Subsequently, as shown in FIGS. 6 and 7, a cooling device 50 that cools the fluid pipe 2 is installed on the fluid pipe 2 between the main pipe 1 and the work gate valve 6.

The cooling device 50 is divided into a plurality of parts in the pipe circumferential direction (two in the vertical direction in FIG. 6), and the fluid pipe 2 includes a divided body 50A that can be sealed in a sealed state via a sealing material 51, and the pipe circumferential direction. The adjacent divided bodies 50A are fastened and connected by connecting means (not shown).
In a state where each divided body 50 </ b> A is sheathed on the fluid pipe 2, a predetermined gap is formed between the inner peripheral surface of each divided body 50 </ b> A and the outer peripheral surface of the fluid pipe 2, and an annular space S is formed. The An annular groove 51a is formed at both ends of the inner peripheral surface of each divided body 50A in the tube axis X direction, and an annular seal member 51 is attached to the groove 51a. In addition, the other joining part of each division body 50A is also sealed with the sealing material which is not shown in figure.
The lower divided body 50A is formed with an introduction port 52 through which the annular space S communicates with the outside, and the upper divided body 50A has a guide that communicates the annular space S with the outside. An outlet portion 53 is formed so as to penetrate the cooling water C from a cooling water source (not shown) through the inlet port 52 to the annular space S and discharged to the outside through the outlet port 53. It is configured to be able to. In addition, the temperature of the cooling water C is set to a temperature lower than that of clean water having a temperature higher than normal temperature.
Therefore, by continuously supplying the cooling water C to the annular space S by the cooling device 50, the region where the cooling device 50 is mounted can be set as the cooling region A.

Next, as shown in FIG. 6, the work gate valve 6 is opened to release the blockage of the flow path in the fluid pipe 2, and the expansion block means 34 of the flow path closing device 30 is connected to the new gate valve 21 and the work. It is inserted through the gate valve 6 up to the channel blockage site upstream of the work gate valve 6 (in the present embodiment, near the center of the cooling region A in the tube axis X direction). Thereafter, as shown in FIG. 7, the expansion blocking means 34 is expanded and deformed to close the fluid pipe 2 in the flow path blocking portion. In addition, the length of the cooling region A is configured to be larger than the closing length in the tube axis X direction by the expansion closing means.
In this state, since the clean water W does not exist in the flow path of the fluid pipe 2 on the downstream side of the flow path blocking part, the fluid pipe 2 on the downstream side of the cooling region A is cooled more efficiently, The expansion-expanding elastic body 38 (rubber) subjected to the expansion operation of the expansion / closing means 34 that is in close contact with the inner surface of the fluid pipe 2 in the cooling region A is cooled favorably by the cooling heat of the cooling device 50, and the expansion elastic The water stop performance of the body 38 (rubber) is stabilized.

  Subsequently, in a state in which each divided valve box 7a and each divided pusher body 13a of the work gate valve 6 are left in the fluid pipe 2, they are screwed into the female screw portion 8b of the valve body mounting port portion 8 of the upper divided valve box 7a. The threaded engagement of the male screw portion 10c of the valve lid 10 is released, and the valve lid 10 (an example of a part of an existing fluid device) is removed together with the valve body 9.

  And, as shown in FIG. 8, in the state where each divided pusher body 13a is removed from the work gate valve 6 together with the elastic seal material 13b, and the divided valve box 7a is positioned by the sealing means 62 described later with respect to the fluid pipe 2. Between the tapered surface 7e formed at both ends in the tube axis X direction of the fluid pipe 2 in the semi-cylindrical portion of each divided valve box 7a and the outer peripheral face of the fluid pipe 2, the outer peripheral face of the fluid pipe 2 is The entire circumference is hermetically fixed by welding (see FIGS. 8 and 10 to 13).

  Next, whether or not the welded divided valve box 7a is securely sealed with respect to the fluid pipe 2 is tested using the sealing test device 60.

As shown in FIGS. 9 and 10, the sealing test apparatus 60 includes an annular plug 61 capable of screwing a male screw portion 61 a formed on the outer peripheral surface with a female screw portion 8 b of the valve body mounting port portion 8, and The plug 61 is provided with a sealing means 62 that can be operated from the outside through a through hole 61b that is formed through the center of the plug 61 in the vertical direction and can close the perforation port 2a of the fluid pipe 2.
On the outer peripheral surface of the plug 61, a ring groove 61c for mounting an O-ring 61f for sealing between the inner surface of the valve body mounting port portion 8 on the tip side of the male screw portion 61a, and a base than the male screw portion 61a. On the end side, an annular flange 61d capable of contacting the upper surface of the annular flange 8a of the valve body mounting port 8 is provided. A female screw part 61e is provided on the inner peripheral surface above the through hole 61b of the plug 61.
The sealing means 62 is positioned on the distal end side of the cylindrical first operating shaft 63, the rod-shaped second operating shaft 64 positioned in the first operating shaft 63, and the first operating shaft 63 and the second operating shaft 64. A closing portion 65 that closes the perforation port 2, a closing operation means 66 that operates the closing portion 65 from the outside via both operation shafts 63 and 64, and a relative position of the closing operation means 66 relative to the closing operation means 66. A sealing member K (see FIG. 10C) is provided that is rotatably mounted and seals a gap formed between the operation shafts 63 and 64 with a ball valve (not shown).
The first operating shaft 63 includes a male threaded portion 63a at the center in the vertical direction on the outer peripheral surface, an annular groove 63c for mounting an O-ring 63b positioned on the distal end side of the male threaded portion 63a, and an annular flange at the distal end. 63d.
The second operation shaft 64 is configured to be insertable into the first operation shaft 63, and includes a male screw portion 64a at the tip.

The closing portion 65 includes a holder 67, an upper holding plate 68, an elastic diameter expanding rubber 69, and a lower holding plate 70 in order from the distal end side of the second operation shaft 64.
The holder 67 includes an annular main body portion 67a, a female screw portion 67b that is recessed in the central portion on the upper surface side of the main body portion 67a and that engages with the male screw portion 64a of the second operation shaft 64, and a lower surface of the main body portion 67a. A male screw shaft 67c protruding downward from a cylindrical portion (not shown) formed to protrude downward from the central portion on the side, and a pair of arms 67d formed protruding outward in the radial direction of the main body 67a. It has.
The upper holding plate 68 includes an annular main body 68b having a through hole 68a at the center, a cylindrical portion 68c protruding upward from an outer peripheral end of the main body 68b, and a pair of cylindrical portions 68c. A notch portion 68d and a lower pressing surface 68e having a pair of inclined surfaces projecting downward as it goes radially outward on the lower surface side of the main body portion 68b are provided.
The lower holding plate 70 has an annular main body portion 70b having a cylindrical portion 70a protruding upward at the center portion, a female screw portion 70c formed to be recessed in the cylindrical portion 70a, and a diameter on the upper surface side of the main body portion 70b. The upper pressing surface 70d has a pair of inclined surfaces that retreat upward as it goes outward in the direction, and a pair of inclined surfaces that protrude downward as it goes radially outward on the lower surface side of the main body 70b. And a lower side surface 70e.
The elastic expanded rubber 69 includes an annular main body 69a having a through hole 69b at the center, the upper surface of the main body 69a corresponds to the lower pressing surface 68e of the upper pressing plate 68, and the lower surface is the lower pressing plate. 70 is formed in a shape corresponding to the upper pressing surface 70d.

  In the closing portion 65, the pair of arms 67d of the holder 67 are fitted into the pair of notches 68d of the upper holding plate 68, and the cylindrical portion (not shown) and the male screw portion 67c are inserted into the through hole 68a. In this state, the main body 67 a of the holder 67 is supported by the cylindrical portion 68 c of the upper restraining plate 68 so as not to be relatively rotatable, and the cylindrical portion 70 a of the lower restraining plate 70 penetrates the elastic diameter-expanded rubber 69. In the state where the male threaded portion 67c of the holder 67 is threadedly engaged with the female threaded portion 70c of the cylindrical portion 70a, the elastic diameter-expanded rubber 69 is in contact with the lower pressing surface 68e and the lower side of the upper holding plate 68. It arrange | positions between 70 d of upper side press surfaces of the control board 70. FIG.

Therefore, as shown in FIG. 8, when each divided pusher body 13a is removed from the work gate valve 6 together with the elastic sealing material 13b and the divided valve box 7a is positioned by the sealing means 62 with respect to the fluid pipe 2 (before the welding operation). ) In the sealing means 62, the rod-like second operating shaft 64, the holder 67, the upper restraining plate 68, the elastic expanded rubber 69, and the lower restraining plate 70 are integrally assembled. Thus, the lower ends of the pair of arm portions 67d of the holder 67 abut against the peripheral edge portion of the insertion hole 7f of the divided valve box 7a, and the lower side surface 70e of the lower holding plate 70 is the outer operation shaft 32 of the flow path closing device 30. Inserted into the valve body mounting port 8 so as to be positioned in the vicinity of the outer peripheral surface, an elastic expanded rubber 69 formed with a slightly smaller diameter than the perforated port 2a of the fluid pipe 2 is provided over the entire circumference of the perforated port 2a. Position it at the opposite position.
Thereby, the sealing means 62 can position the valve body mounting port portion 8 of the divided valve box 7a with respect to the perforated port 2a.

  Further, when testing whether or not the welded divided valve box 7a is securely sealed with respect to the fluid pipe 2 using the sealing test apparatus 60, as shown in FIG. Of the means 62, the holder 67 in a state in which the rod-shaped second operation shaft 64, the holder 67, the upper holding plate 68, the elastic diameter-expanding rubber 69, and the lower holding plate 70 are assembled together. The lower ends of the pair of arm portions 67d are in contact with the peripheral edge portion of the insertion hole 7f of the divided valve box 7a, and the lower side surface 70e of the lower holding plate 70 is in the vicinity of the outer peripheral surface of the outer operation shaft 32 of the flow path closing device 30. It is inserted into the valve body mounting port 8 so as to be positioned, and the elastic expanded rubber 69 formed with a slightly smaller diameter than the perforated port 2a of the fluid pipe 2 is positioned at a position facing the entire circumference of the perforated port 2a. Let 10B, the male threaded portion 63a of the first operating shaft 63 is screwed into the female threaded portion 61e in the through hole 61b of the plug 61 from the lower side of the plug 61. 2 The first operating shaft 63 and the plug 61 are externally fitted to the operating shaft 64, and the male threaded portion 61a of the plug 61 is screwed into the female threaded portion 8b of the valve body mounting port portion 8, so that the annular flange 61d of the plug 61 is engaged. Is brought into contact with the upper surface of the annular flange 8a of the valve body mounting port 8. In this state, the lower surface of the annular flange 63 d of the first operating shaft 63 is in contact with the upper surface of the cylindrical portion 68 c of the upper holding plate 68. Thereafter, the cylindrical closing operation means 66 and the sealing member are sealed at the proximal end portions of the first operation shaft 63 and the second operation shaft 64 projecting outside from the through hole 61b of the plug 61 so as to rotate together with the first operation shaft 63. The stop member K is externally fitted.

Then, as shown in FIG. 10 (c), when the closing operation means 66 is rotated to the tightening side, the first operating shaft 63 is pushed and slid to the distal end side while rotating with respect to the second operating shaft 64, The cylindrical portion 68c of the upper pressing plate 68 is pushed by the annular flange 63d of the first operating shaft 63, so that the lower pressing surface 68e of the upper pressing plate 68 moves close to the upper pressing surface 70d of the lower pressing plate 70. The elastic expanding rubber 69 in the reduced diameter state is elastically deformed to an outer diameter larger than the inner diameter of the perforated port 2a by the clamping action accompanying the above, and the perforated port 2a is shut off in a sealed state. Can do. By rotating the first operating shaft 63 to the tightening side, the first operating shaft 63 is pushed and slid to the distal end side, and the cylinder of the upper holding plate 68 is moved by the annular flange 63d of the first operating shaft 63. The shape portion 68c may be pushed.
In this state, the space between the outer peripheral surface of the plug 61 and the inner peripheral surface of the valve body mounting port portion 8 is also sealed by the O-ring 61f, and the first operating shaft 63 and the second operating shaft 64 The gap is also sealed by the closing operation means 66 and the sealing member K. Therefore, the closed space Q sealed by the plug 61 and the elastic expanded rubber 69 is sealed between the welded inner surface of each divided valve box 7a and the outer peripheral surface of the fluid pipe 2.
For this reason, in the closed space Q, a sealing test is conducted through a water faucet 7g formed in a semi-cylindrical portion of the upper divided valve box 7a among the divided valve boxes 7a from a supply source (not shown). Water (not shown) is supplied and a sealed test in the closed space Q is performed.

As a result of the sealing test, if it can be confirmed that there is no water leakage, the plug 61 and the sealing means 62 are removed from the valve body mounting opening 8 as shown in FIGS. One example) 71 is attached to the valve body attaching port 8 in a sealed state.
The lid member 71 is formed in an annular shape, and has a male screw portion 71a that can be screwed to the female screw portion 8b of the valve disc mounting port portion 8 on the outer peripheral surface, and a valve disc mounted on the tip side of the male screw portion 71a. A ring groove 71b for mounting an O-ring 72 that seals between the inner surface of the mouth portion 8 and the upper surface of the annular flange portion 8a of the valve body mounting mouth portion 8 can be brought into contact with the base end side of the male screw portion 71a. An annular collar 71c.
Therefore, the lid member 71 can be mounted in a sealed state by screwing the male thread portion 71a of the lid member 71 into the female thread portion 8b of the valve body mounting port portion 8. At this time, the divided valve box 7a of the lid member 71 (an example of a device body of another fluid device welded as a fluid device) is replaced with the divided valve box 7a of the work gate valve 6 (an example of an existing fluid device). The main part (an example of a main body of an existing fluid device) is configured to be shared. Further, another fluid device as a fluid equipment is constructed by the divided valve box 7 a and the lid member 71.

  Thereafter, the cooling device 50 is removed, and the expansion blocking means 34 of the flow path closing device 30 is accommodated in the closing case 31, and the flow path closing device 30 is removed in a state in which the new gate valve 21 is closed. The new gate valve 21 can be opened by connecting to the downstream flange portion 21B of the new gate valve 21 with an appropriate pipe (not shown).

[Second Embodiment]
In the first embodiment, as the work gate valve 6 (an example of an existing fluid device), the valve box 7 having a divided structure that is externally mounted on the fluid pipe 2 and the valve body mounting port portion 8 of the valve box 7 are detachable. And a valve lid 10 having a valve body 9 attached to the valve body 7, and a push ring member separate from the valve box 7 at both ends in the tube axis X direction of the fluid pipe 2 in the semi-cylindrical portion of the valve box 7. 13 and a substantially annular elastic sealing material 13b that seals between the inner peripheral surface of the push ring member 13, the outer peripheral surface of the fluid pipe 2, and the tapered surface 7e of the valve box 7, and each division in the tube axis X direction A movement blocking portion 13c that blocks the movement of the push ring body 13a is provided.

However, the configuration of the work gate valve 6 (an example of an existing fluid device) can be appropriately changed. For example, as in the fluid device cloth replacement method according to the second embodiment shown in FIGS. A configuration that realizes the function of the push wheel member 13 can be a work gate valve (an example of an existing fluid device) 80 that is configured integrally with the valve box 7. In addition, about the structure and construction method similar to 1st Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted or simplified.
Specifically, as shown in FIG. 14, the work gate valve 80 includes a pipe shaft of the fluid pipe 2 in the semi-cylindrical portion of the divided valve box 7 a of the valve box (an example of the device body of an existing fluid device). At both ends in the core X direction, an annular groove 7A is formed on the inner peripheral surface thereof, and a substantially annular elastic sealing material 7B is attached, and the vertical direction is closer to the end in the tube axis X direction than the groove 7A. A female screw hole 7 </ b> C penetrating through is provided. Then, in a state where each divided valve box 7a is mounted on the fluid pipe 2, it is possible to seal between the outer peripheral surface of the fluid pipe 2 by the elastic seal material 7B, and the male screw member 7D is inserted into the female screw hole 7C. , And the biting claw 7E formed at the tip of the male screw member 7D bites into the outer peripheral surface of the fluid pipe 2, thereby preventing the movement of each divided valve box 7a in the tube axis X direction. Is done.

As shown in FIG. 14, the work gate valve 80 is closed to close the flow path in the fluid pipe 2 on the upstream side of the existing gate valve 3, and the existing gate valve 3 is removed as shown in FIG. Then, the new gate valve 21 is connected, the flow path closing device 30 is connected to the new gate valve 21, and the work gate valve 80 is opened.
After that, as shown in FIG. 16, the expansion blocking means 34 of the flow path closing device 30 is inserted to the portion where the cooling device 50 is mounted, and the expansion blocking means 34 is placed in the cooling region A as shown in FIG. Is expanded to close the fluid pipe 2. Since there is no clean water W in the fluid pipe 2 on the downstream side of the flow path closing position, the working gate valve 80 is removed from the outer peripheral surface of the fluid pipe 2 together with the valve box 7 and the valve lid 10. That is, the entire configuration of the work gate valve 80 is removed from the outer peripheral surface of the fluid pipe 2.

  Then, as shown in FIG. 17, a split-structure casing (an example of a device body of another fluid device that is a fluid equipment) 90 that is sheathed on the fluid pipe 2 is sheathed. The casing 90 is divided into a semi-cylindrical divided case 90a that is divided into upper and lower parts in the pipe circumferential direction that can be sheathed from the pipe radial direction to the outer peripheral surface of the fluid pipe 2 via a plurality of bolts 11 and nuts 12, respectively. A valve body mounting port portion 91 (like the valve body mounting port portion 8 of the first embodiment) formed so as to protrude on the radially outer side (upper side) of the fluid pipe 2 in one of the split cases 90a. Configuration). An insertion hole 7f is formed through the portion where the valve body mounting port 91 is formed in the semi-cylindrical portion of the split case 90a.

The semi-cylindrical portion of the divided case 90 a that is externally provided on the outer peripheral surface of the fluid pipe 2 includes an inner peripheral surface that is slightly larger in diameter than the outer peripheral surface of the fluid pipe 2. A predetermined gap is formed between the inner peripheral surface of each divided case 90 a and the outer peripheral surface of the fluid pipe 2. In addition, in the semi-cylindrical portion of the upper divided case 90a in each divided valve box 7a, the predetermined gap is communicated with the outside so that water for sealing test (an example of pressure fluid) can flow from the outside. A water tap 91c is provided (see FIG. 18).
As the valve body mounting port portion 91 protrudes from both ends in the tube axis X direction of the fluid pipe 2 in the semi-cylindrical portion of each divided case 90a, the distance from the portion formed so as to protrude along the tube axis X direction. A tapered surface 91d that expands in diameter is formed.
In addition, each split case 90a is configured such that end surfaces along the tube axis X direction are in contact with each other in the up-down direction in a state of being covered with the fluid pipe 2, and is separated upward or downward from each end surface. A plurality of connecting plate portions 91e extending in the horizontal direction from the portion are provided. A pair of connecting plate portions 91e is provided in each divided case 90a. Each connecting plate portion 91e is provided with an insertion hole (not shown) penetrating in the vertical direction through which the bolt 11 can be inserted.

  Accordingly, when the divided cases 90a are externally attached to the fluid pipe 2 in a state where the end surfaces along the tube axis X direction are in contact with each other in the vertical direction, the connection plate portions 91e to be connected by tightening are connected in the vertical direction. Since the bolts 11 and the nuts 12 inserted into the insertion holes are tightened and connected with a predetermined gap between the opposing surfaces, the end faces where the divided cases 90a abut with each other through the predetermined gap in a side view. However, it is comprised so that it may expose to the radial direction outer side of the division | segmentation case 90a. That is, even in a state where the connecting plate portions 91e are fastened and fixed by the bolts 11 and the nuts 12, the end surfaces with which the divided cases 90a abut through the predetermined gap can be welded from the side of the divided cases 90a. It is configured to be possible.

  Therefore, when the work gate valve 80 is removed from the outer peripheral surface of the fluid pipe 2 together with the valve box 7 and the valve lid 10 and the divided case 90a is positioned by the sealing means 62 with respect to the fluid pipe 2 (before the welding work). The sealing means 62 is inserted into the valve body mounting port 91, and the elastic expanded rubber 69 formed to have a slightly smaller diameter than the perforated port 2a of the fluid pipe 2 is placed at a position facing the entire circumference of the perforated port 2a. Position. Thereby, the valve body mounting port portion 91 of the divided case 90a is positioned with respect to the perforation port 2a by the sealing means 62.

Further, whether or not the welded divided case 90a is securely sealed with respect to the fluid pipe 2 is tested using the sealing test device 60 in the same manner as in the first embodiment.
As a result of the sealing test, if it can be confirmed that there is no water leakage, the sealing test device 60 is removed from the valve body mounting port portion 91, and a lid member (an example of the remaining device constituent members) 71 is placed in the valve body mounting port portion 91. Wear sealed.
The lid member 71 is formed in an annular shape, and has a male screw portion 71a that can be screwed to the female screw portion 91b of the valve body mounting port portion 91 on the outer peripheral surface, and a valve body mounted on the tip side of the male screw portion 71a. A ring groove 71b for mounting an O-ring 72 that seals between the inner surface of the mouth portion 91 and the upper surface of the annular flange portion 91a of the valve body mounting mouth portion 91a can be brought into contact with the base end side of the male screw portion 71a. An annular collar 71c.
Therefore, the lid member 71 can be mounted in a sealed state by screwing the male thread portion 71a of the lid member 71 into the female thread portion 91b of the valve body mounting port 91. At this time, another fluid device (an example of fluid equipment) is constructed by the divided case 90 a and the lid member 71.

  Thereafter, the cooling device 50 is removed, and the expansion blocking means 34 of the flow path closing device 30 is accommodated in the closing case 31, and the flow path closing device 30 is removed in a state in which the new gate valve 21 is closed. The new gate valve 21 can be opened by connecting to the downstream flange portion 21B of the new gate valve 21 with an appropriate pipe (not shown).

[Another embodiment]
(1) In the first and second embodiments described above, when an existing fluid device is updated to another fluid device (an example of fluid equipment), the work gate valves 6 and 80 are illustrated as existing fluid devices. Although the valve box 7 and the lid member 71 or the casing 90 and the lid member 71 are exemplified as the fluid equipment, other configurations can be exemplified as the existing fluid equipment and fluid equipment. For example, as another fluid device that is a fluid equipment, a joint body having a split structure that is sealed on the outer peripheral surface of the fluid pipe 2, between the outer peripheral surface of the fluid pipe 2 and the inner peripheral surface of the joint body. The annular space communicates with the perforation port 2a (the configuration not including the valve body mounting port portions 8 and 91 in the above-described embodiments) and the annular shape on the outer peripheral surface of the fluid pipe 2 including the perforation port 2a of the fluid pipe 2 These regions can be covered with a partially annular iron plate having a divided structure in a sealed state. In addition, for example, the fluid equipment is constituted by an arc-shaped bowl-shaped iron plate that can be externally fixed to the fluid pipe 2 by welding in a state in which at least the perforation port 2a of the fluid pipe 2 is closed. You can also

(2) In the first and second embodiments, the flow path closing device 30 is connected to the new gate valve 21, and the cooling device 50 is externally installed on the upstream side of the work gate valve 6 and the like, and then the flow path closing device 30. In this configuration, the flow path of the fluid pipe 2 in the portion where the cooling device 50 is mounted is closed and the valve lid 10 of the work gate valve 6 is removed, but the connection of the flow closing device 30 and the exterior of the cooling device And the blockage | closure of the flow path of the fluid pipe | tube 2 by the flow-path obstruction | occlusion apparatus 30 can change an order in the range which does not deviate from the main point of this invention. The flow path closing device 30 may be connected and the flow path closing device 30 may close the flow path of the fluid pipe 2 and then the cooling device 50 may be externally mounted. It is good also as a structure which connects the obstruction | occlusion apparatus 30 and obstruct | occludes the flow path of the fluid pipe | tube 2 with the flow path obstruction | occlusion apparatus 30. FIG. In short, when the existing gate valve is updated to the new gate valve and when the existing fluid device is removed, the flow channel in the fluid pipe 2 is blocked by the flow channel closing device 30, and another fluid device (fluid) When welding one example of the equipment to the fluid pipe 2, the cooling device 50 only needs to be externally provided.

(3) In the first and second embodiments described above, the cooling device 50 has positioned the flow passage blocking portion by the expansion blocking means 34 of the flow blocking device 30 in the central portion of the cooling region A. The flow path blocking part may be positioned.
For example, the flow path blockage site by the expansion block means 34 is biased to a position that is biased away from the perforation port 2a in the direction of the tube axis X in the cooling region A by the cooling device 50 or a side that is closer to the perforation port 2a. It may be located at a position. Further, the flow path blocking part may be located at a position biased toward the side closer to the perforation port 2a than the cooling area A. That is, the cooling device 50 that cools the fluid pipe 2 may be externally mounted on the fluid pipe 2 between the flow path blocking portion of the fluid pipe 2 by the expansion blocking means 34 and the exterior fixing portion of the existing fluid device.
Further, the length of the cooling region A in the tube axis X direction by the cooling device 50 may be configured to be equal to or smaller than the closing length in the tube axis X direction by the expansion blocking means 34.

(4) In the above embodiment, the cooling device 50 is configured to continuously supply the cooling water C to the annular space S formed between the inner peripheral surface of each divided body 50A and the outer peripheral surface of the fluid pipe 2. However, other fluids and other structures can be employed as long as the cooling region A, which is a portion where the cooling device 50 is externally mounted, can be cooled satisfactorily.

(5) In the above embodiment, the valve body mounting port 8 or the valve body is mounted in the tube axis X direction in the semi-cylindrical portion of the upper divided valve box 7a or the divided valve box 90a among the divided valve boxes 7a. A predetermined gap between the inner peripheral surface of each divided case 7a or each divided case 90a and the outer peripheral surface of the fluid pipe 2 communicates with the outside at a position separated from the mouth portion 91, and is used for a sealing test from the outside. A water faucet 7g or a water faucet 91c capable of flowing water (an example of a pressure fluid) was provided.
However, if the sealing test can be performed by allowing water for sealing test (an example of pressure fluid) to flow into the predetermined gap from the outside, a supply mechanism such as a water faucet is provided at other locations. Can do.
For example, as shown in FIG. 10C, as the supply mechanism, a gap formed between the operation shafts 63 and 64 mounted on the proximal end side of the closing operation means 66 in the sealing means 62 is provided as a ball valve. Using a sealing member K sealed by (not shown), a communication path communicating with the sealing member K from the outside through a ball valve (not shown) so that water for sealing test can be supplied to the gap (Not shown) can be provided. Thereby, a predetermined gap between the inner peripheral surface of each divided case 7a or each divided case 90a and the outer peripheral surface of the fluid pipe 2 is communicated with the outside, and water for sealing test (an example of pressure fluid) is externally provided. As an inflowable configuration, a sealing test of the predetermined gap, that is, whether or not the welded divided valve box 7a or the divided valve box 90a is securely sealed to the fluid pipe 2 can be inspected.

  As explained above, it is possible to reliably prevent fluid leakage over a long period of time with the existing fluid equipment replaced with fluid equipment and the fluid equipment sheathed on the fluid pipe, and the fluid equipment is welded to the fluid pipe. Thus, it is possible to provide a fluid device laying / replacement method capable of performing the work to be performed reliably, simply, quickly and safely.

2 Fluid pipe 2a Perforation port (through hole)
3 Existing gate valve (gate valve)
6 Work gate valve (existing fluid equipment)
7 Valve box (equipment main body of existing fluid equipment, equipment main body of another fluid equipment (fluid equipment))
7B Elastic sealing material 8 Valve body mounting port (tubular part)
8b Female thread (screw part)
9 Valve body 10 Valve lid 13b Elastic seal material 21 New gate valve 30 Flow path closing device 34 Expansion blocking means 50 Cooling device 61 Plug 62 Sealing means 71 Lid member (remaining equipment constituent members, other fluid equipment (fluid equipment))
80 Work gate valve (existing fluid equipment)
90 Casing (equipment main body of another fluid device (fluid equipment), another fluid equipment (fluid equipment)
91 Valve body mounting part (tubular part)
91b Female screw part (screw part)
A Cooling area Q Closed space X Pipe core W Water (fluid)

Claims (7)

A split structure that communicates with a through-hole formed in the fluid pipe at the upstream side portion of the gate valve connected to the fluid pipe and is externally fixed to the fluid pipe in a sealed state with an elastic sealant. In a fluid transport path in which an existing fluid device having a device body is provided, the existing fluid device is placed on a fluid device that is externally fixed to the fluid pipe by welding with the through-hole closed. It is a fluid equipment laying replacement method to be replaced, and includes the following steps (a) to (e).
(B) An expansion blockage that can be inserted into the gate valve up to a pipeline blockage scheduled position upstream of the existing fluid device in the fluid pipe and that closes the flow path by a rubber expansion operation on the tip side. Connecting a flow path closing device with means,
(B) the fluid pipe is connected to the fluid pipe between the fluid pipe closed portion by the expansion block means of the flow passage closing device or between the flow passage closed portion and the exterior fixing portion of the existing fluid device. A process of mounting a cooling device for cooling;
(C) removing a part or all of the existing fluid device in a state in which the flow path blocking portion of the fluid pipe is closed by the expansion blocking means of the flow path closing device;
(D) cooling the portion where the cooling device is sheathed in the fluid pipe with the cooling device, and fixing the fluid equipment in a sealed state by welding to the fluid pipe with the through hole closed;
(E) A step of removing the flow path closing device and the cooling device. In the step (c), part or all of the existing fluid device is removed, and a device body having a divided structure constituting another fluid device as the fluid device is constructed in an exterior state on the fluid pipe. ,
In the step (d), the portion where the cooling device is sheathed is cooled by the cooling device, and the device main body of the other fluid device constructed in the fluid pipe is sealed to the fluid pipe by welding. The fluid device cloth replacement method according to claim 1, wherein the other fluid device is constructed by assembling the remaining device constituent members in a sealed state on the device main body of the other fluid device that is fixed to the exterior and welded.   The device main body in another fluid device as the fluid equipment is provided with a tubular portion communicating with the through hole of the fluid tube, and the threaded portion provided on the inner surface of the tubular portion penetrates the fluid tube. A plug that holds the sealing means for sealing the hole in an operable state from the outside is screwed in a sealed state, and is welded between the inner surface of the device main body of the other fluid device and the outer peripheral surface of the fluid pipe. A pressure fluid is supplied into a closed space sealed by the plug and the sealing means, and a sealing test is performed. Then, the plug and the sealing means are removed, and the remaining thread is attached to the threaded portion of the tubular portion. The fluid device cloth replacement method according to claim 2, wherein a lid member that is a device constituent member is screwed and attached in a sealed state. The cooling device is externally mounted on the flow path blocking portion of the fluid pipe by the expansion blocking means of the flow path closing device,
The cooling region length in the tube axis direction by the cooling device is configured to be larger than the blocking length in the tube axis direction by the expansion blocking means of the flow path closing device. Fluid equipment replacement method.   The fluid device laying according to claim 4, wherein the flow path blocking portion by the expansion blocking means of the flow path closing device is set to a cooling portion biased to the side away from the through hole in the cooling region by the cooling device. Replacement method.   The fluid device cloth replacement method according to any one of claims 2 to 5, wherein the device body of the another fluid device is configured to share the main part of the device body of the existing fluid device.   The existing fluid device is a work gate valve installed at the time of renewal of the gate valve, and has a split structure valve box as a device main body sheathed on the fluid pipe, and a valve body mounting port portion of the valve box The fluid device cloth replacement method according to any one of claims 1 to 6, further comprising a valve lid having a valve body that is detachably attached to the device.

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