JP2016075312A - Fluid pipe removal method, protective case and cutting closing device used for the method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a fluid pipe such as a lead pipe and the like connected to a pipe connection part of a pipe joint to be removed efficiently in a less-expensive manner under a non-cut flow state and further make a size of the pipe joint structure compact after its removal.SOLUTION: A method for removing a fluid pipe connected to a pipe connection part of a pipe joint J under a non-cut flow state comprises the steps of: operating cutting operation means A1 of a cutting closing device A installed at the pipe connection part of the pipe joint J, cutting and separating the pipe connection part at a set cutting position by a blade part 11a of a cutting closing body 11, and tightly closing a flow passage opening 5 of a cutting end surface 4a of the pipe connection part by an opening closing part 11b of the cutting closing body 11; returning the cutting closing body 11 to an opening releasing position by the cutting operation means A1 of the cutting closing device A, thereafter, operating closing operation means of a flow passage closing device, feeding the closing means from the opening part of the cutting closing device A corresponding to the flow passage opening 5 to a set closing location to set the closing means to its closed state; and removing the cutting closing device A while the closing means is left under its closed state.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a method of removing a fluid pipe to be removed connected to a pipe connection portion of a pipe joint in an uninterrupted state, and a protective case and a cutting / closing device used therefor.

  For example, lead pipes are used as water supply pipes (an example of fluid pipes to be removed) from water mains (distribution pipes), which are an example of fluid mains, to water meters of each consumer, In some cases, in order to avoid the possibility of lead elution, a construction to replace the pipe with a new pipe other than a lead pipe such as a polyethylene pipe is being carried out.

As shown in FIG. 1, for example, as shown in FIG. 1, the pipe connection part of resin cheese (an example of a pipe joint) attached to a water main pipe and a lead water supply pipe are shown in FIG. Is connected.
The cheese pipe connection part is composed of a branch pipe integrally formed on the cheese body and a resin connection pipe connecting the branch pipe and the lead water supply pipe, and is connected to the cheese pipe connection part. When removing the lead water supply pipe, it is necessary to block the branch pipe of the cheese body or the flow path in the connection pipe.

  And as a method for blocking the flow path in the cheese pipe connection part, for example, as shown in Patent Documents 1 and 2, a valve insertion port is formed by drilling with a hole saw in a fluid pipe in an indefinite water state. It is conceivable to use a flow path blocking method in which a valve body is inserted from the mouth to block the flow path of the fluid pipe.

That is, in the fluid pipe removing method using the above-described channel blocking method,
A step of attaching a split structure housing with a work on / off valve to the cheese tube connection,
Attaching a drilling device with a hole saw to the housing;
Opening the work on / off valve and feeding the hole saw, forming a valve insertion port in the cheese tube connection with the hole saw; and
A step of removing the drilling device from the housing, after returning the hole saw and closing the work on-off valve;
A process of mounting a flow path blocking device having a valve body on the housing;
Opening the work on-off valve, sending the valve body of the flow path shut-off device from the valve insertion port into the pipe connection part, and shutting off the flow path in the pipe connection part;
After removing the lead water pipe connected to the cheese pipe connection part and the casing, the casing is equipped with a valve pressing tool that presses and fixes the valve element in the flow path shut-off state. The process of removing from
Execute.

Japanese Utility Model Publication 62-31751 Japanese Utility Model Publication No. 63-47337

In the fluid pipe removing method described above, a split structure housing having a work on / off valve is attached to a cheese pipe connection portion, and a perforation device having a hole saw and a valve body are attached to the housing. It is necessary to replace the road blocking device. Furthermore, since it is necessary to remove the work on / off valve from the housing after mounting the valve pressing tool that presses and fixes the valve body in the flow path shut-off state, many complicated operations are required for removing the lead water pipe. Cost.
Moreover, since a large housing with a valve body and a valve pressing tool assembled in the exterior is left in the cheese pipe connection part, not only does the pipe joint structure after removal of the fluid pipe increase in size, but construction There is an inconvenience that the cost increases.

In particular, since the hole saw of the punching device and the valve element of the flow path blocking device have a relatively large width in the tube axis direction, the installation space in the tube axis direction in the casing is also increased accordingly.
Therefore, in a site where the space from the outer surface of the cheese cheese body to the tip of the lead water supply pipe is narrow, a casing having a large installation space cannot be mounted, so the above-described fluid pipe removal method cannot be used.
In this case, the water main (distribution pipe) where cheese is installed must be shut off and the lead water pipe must be removed. Become.

  In addition, when the water supply pipe is removed, the sealing function between the outer peripheral surface of the water main (distribution pipe) and the inner surface of the cheese is often deteriorated due to secular change. May cause water leakage.

  In view of the above situation, the main problem of the present invention is that a fluid pipe such as a lead pipe connected to a pipe connecting portion of a pipe joint can be efficiently and inexpensively removed in an uninterrupted state, and the pipe after removal The present invention is to provide a fluid pipe removing method capable of downsizing the joint structure, and a protective case and a cutting / closing device useful for the method.

A first characteristic configuration according to the present invention is a method of removing a fluid pipe to be removed connected to a pipe connection portion of a pipe joint in an uninterrupted state,
A cutting closure body having a blade part for cutting the pipe connection part and an opening closing part capable of closing the flow path opening of the cut end face of the pipe connection part cut by the pipe connection part of the pipe joint; Attaching a cutting closing device comprising a cutting operation means for moving the cutting closing body in the cutting direction;
The cutting operation means of the cutting and closing device is operated to feed the cutting and closing body to cut and separate the pipe connecting portion at a set cutting position, and the flow opening on the cutting end surface of the pipe connecting portion is A step of closing at the opening closing portion;
A closing means capable of closing a set closing portion upstream of the cutting closure body in the pipe joint, and the closing means from the opening of the cutting closing device corresponding to the flow path opening to the set closing portion. A step of mounting a flow path closing device provided with a closing operation means for sending and closing;
After the cutting closing means at the opening closing position is returned to the opening opening position by the cutting operation means of the cutting and closing device, the closing means is sent from the flow path opening to the set blocking portion in the pipe joint. And operating the closing means with the closing operation means into a closing state;
Removing the cutting and closing device while leaving the closing means in a closed state;
Is to execute.

  According to the above configuration, when the cutting operation unit of the cutting and closing device attached to the pipe connection part of the pipe joint is operated to feed the cutting and closing body in the cutting direction, the setting of the pipe connection part is performed by the blade part of the cutting and closing body. At the same time as the cutting position is cut and separated, the opening of the cutting closure body can close the flow path opening on the cut end face of the pipe connecting portion.

  By performing the cutting and closing process by the cutting and closing device, the separation-side pipe connection part cut at the set cutting position and the fluid pipe to be removed are removed from the pipe connection part of the pipe joint. Can do.

  Further, the cutting closure body of the cutting and closing device is provided with a blade part for cutting the pipe connection part and an opening closing part capable of closing the flow path opening of the cutting end face. Therefore, it is not necessary to replace the perforating device provided with the hole saw and the flow path blocking device provided with the valve body with respect to the divided structure housing provided with the open / close valve for use, and the removal work efficiency can be improved.

  Further, after the flow passage closing device is mounted, the cutting operation means of the cutting and closing device is operated to operate the cutting closure body closing the flow passage opening of the cutting end surface of the pipe connecting portion to the opening open position, By operating the closing operation means of the flow path closing device and feeding the closing means to the set closing site in the pipe joint from the flow path opening, and operating in the closed state, the upstream side of the cut closure body in the pipe joint. The set occlusion site can be reliably blocked.

  Therefore, by leaving the blocking means in the closed state at the set blocking site in the pipe joint, the cutting and closing device attached to the pipe joint in the exterior state can be easily removed.

  Therefore, the fluid pipe to be removed, such as a lead pipe connected to the pipe connecting portion of the pipe joint, can be removed efficiently in an uninterrupted state and advantageously in terms of construction cost, and after the fluid pipe is removed. A compact pipe joint structure can be achieved.

  According to a second characteristic configuration of the present invention, in the mounting step of the cutting and closing device, a detachment preventing tool for blocking detachment movement due to fluid pressure of the cutting and closing device with respect to a pipe connection portion of the pipe joint is mounted. .

  According to the above configuration, when the cutting and closing body of the cutting and closing device is fed in the cutting direction and the cutting position of the pipe connecting portion is cut and separated by the blade portion of the cutting and closing body, the cutting and closing device is connected via the cutting and closing body. The fluid pressure to the detachment side along the tube axis direction acting on can be strongly received by the cooperation of the original mounting fixing force of the cutting and closing device and the detachment prevention force by the detachment prevention tool. Therefore, the cut closure body can be reliably maintained in the closed state with respect to the flow path opening of the cut end face of the pipe connection portion.

  According to a third characteristic configuration of the present invention, in the cutting and closing process of the cutting and closing device, the pipe connecting portion is cut and separated at a set cutting position by pressing the blade portion accompanying the feeding of the cutting and closing body. .

  According to the above configuration, the set cutting position of the pipe connecting portion is press-cut with the blade portion of the cutting closure body. Therefore, it is preferable to reduce the thickness of the cutting closure body in order to reduce the pressing resistance. Along with this, it is possible to reduce the installation space in the pipe axis direction of the pipe connection part in the cutting and closing device, so it is easy to carry out even in the site where the space from the outer surface of the pipe joint to the tip of the fluid pipe to be removed is small can do.

  According to a fourth characteristic configuration of the present invention, after the step of removing the cutting and closing device, the blocking means in the flow path closing device or the other blocking component excluding the blocking means and the closing operation means is removed, The fluid main pipe to which the pipe joint is attached can surround the whole pipe joint and a part of the fluid main pipe in a sealed state, and is opposed to the flow path opening on the cut end surface of the pipe connecting portion. The point is to execute a step of attaching a protective case having a connection opening formed in the part.

  According to the above configuration, the pipe after the fluid pipe is removed by removing the closing means in the flow path closing apparatus or the other closing structural member excluding the closing means and the closing operation means after the removal process of the cutting and closing apparatus. The downsizing of the joint structure can be promoted.

  Moreover, since the entire pipe joint and a part of the fluid main pipe are enclosed in a sealed state by the protective case attached to the fluid main pipe, the seal between the fluid main pipe and the pipe joint is removed after the fluid pipe is removed. Even if the function deteriorates due to aging and fluid leakage occurs, the fluid leakage to the outside can be reliably prevented by the protective case.

  Furthermore, since the connection opening is formed in the protective case at the portion facing the flow path opening on the cut end face of the pipe connection portion, it is left behind by the closing operation hand inserted into the connection opening of the protective case. The closing means that is present can be easily operated.

  According to a fifth characteristic configuration of the present invention, after the protective case mounting step, the step of sealing the connection port portion of the protective case with a plug in a state where only the closing means of the flow path closing device is left. It is in.

  According to the above configuration, the fluid is sealed to the outside by the fluid sealing action by the closing means closing the set closing site in the pipe joint and the fluid sealing action by the plug that seals the connection port of the protective case. Leakage can be reliably prevented.

  Further, when it is necessary to connect a new fluid pipe to the connection port of the protective case, the closing means in the pipe joint can be easily taken out from the connection port of the protective case from which the plug has been removed. .

  According to a sixth characteristic configuration of the present invention, an opening / closing valve is connected to a connection port portion of the protective case after the attaching process of the protective case, and a working case capable of storing the closing means is connected to the opening / closing valve. A step of operating the closing means with the closing operation means to release the closed state, collecting the closing means into the working case via the open / close valve in the open state, and closing the open / close valve. After the operation, the step of removing the working case is performed.

  According to the above configuration, the working case is operated by operating the closing means closing the set closing portion in the pipe joint to the closed release state using the on-off valve and the working case connected to the connection port of the protective case. Can be recovered efficiently.

  Moreover, in the state where the working case is removed, the on-off valve is connected to the connection port of the protective case, so that even when a new fluid pipe is connected, it can be easily implemented.

  A seventh characteristic configuration according to the present invention is the protective case used in the fluid pipe removing method according to any one of the fourth characteristic configuration to the sixth characteristic configuration, wherein the connection port portion includes a plug and There is an internal plug that can be selectively connected to other fluid equipment.

  According to the above configuration, the protective case is attached to the fluid main body in a state in which the entire pipe joint and a part of the fluid main body are enclosed in a sealed state. Even if the sealing function with the pipe joint deteriorates due to aging and fluid leakage occurs, the protective case can reliably prevent fluid leakage to the outside, and the fluid main pipe fitting The mounting location can be reinforced.

  In addition, the inner plug provided in the connection port portion of the protective case can selectively and easily connect other fluid equipment such as a plug or an on-off valve in accordance with the construction form after removal of the fluid pipe.

  An eighth characteristic configuration according to the present invention is the cutting and closing device used in the fluid pipe removing method according to any one of the first characteristic configuration to the sixth characteristic configuration, wherein the pipe connection portion of the pipe joint is provided. On the other hand, the cutting closure body and the cutting operation means are provided in a housing having a split structure that can be mounted from the radial direction, and the cutting end face of the cutting closure body and the pipe connecting portion is provided on the inner peripheral surface of the housing. The sealing material which seals between is provided.

  According to the above configuration, when the split structure housing is attached to the pipe connection portion of the pipe joint from the radial direction, the blade portion of the cutting closure body facing the inner peripheral surface side of the housing in the open state is It can be easily aligned with the set cutting position of the connecting part, and the sealing material provided on the inner peripheral surface of the housing can securely seal between the cutting closure body and the cutting end surface of the pipe connecting part. it can.

Partially cutaway plan view showing the cutting preparation step of the fluid pipe removing method of the first embodiment Partially cutaway plan view showing the mounting process of the cutting and closing device Partially cutaway side view showing the mounting process of the cutting and closing device Partial cutaway front view of the main part showing the mounting process of the cutting and closing device Longitudinal side view of the main part showing the mounting process of the cutting and closing device Partially cutaway side view showing the cutting and closing process by the cutting and closing device Partial cutaway front view of the main part showing the cutting and closing process by the cutting and closing device The top view which shows the mounting process of a channel blockage device Cross-sectional side view showing the mounting process of the channel blocker Partially cutaway side view showing the mounting process of the flow path blocking device Enlarged sectional view of the closing means Partially cutaway side view showing the blockage process by the channel blocker Cross-sectional side view showing removal process of first working case of channel closing device and cutting / closing device Disassembled cross-sectional side view showing the water-stop process with a protective case Cross-sectional side view showing the water-stop process with a protective case Horizontal cross section showing the water stop process with a protective case Partially cutaway side view showing a protective case mounting step, a ball valve mounting step, and a second working case mounting step for recovering the closing means in the fluid pipe removing method of the second embodiment. Partially cutaway side view showing the recovery process of the closing means Cross-sectional side view showing the removal process of the flow path blocking device B

[First Embodiment]
1-16, the water distribution pipe 1 which is an example of the fluid main pipe is mounted with a resin J (polyvinyl chloride or the like) cheese J which is an example of a pipe joint, and the pipe connection portion Ja of the cheese J is In a water pipe system (fluid piping system) to which a lead water pipe 2 which is an example of a fluid pipe to be removed is connected, a lead water pipe 2 which may lead elution is connected to the water distribution pipe 1. A water supply pipe removing method (fluid pipe removing method) for removing water in a continuous water state (continuous flow state) maintaining the flow of clean water (fluid) is shown.

  The pipe connecting portion Ja of the cheese J used in this water pipe removing method is a water pipe axis (main pipe axis) X in the resin cheese body 3 that is fitted and connected to the ends of both water pipes 1 in a watertight state. It consists of a branch pipe 3A integrally formed in the central portion in the direction, and a connection pipe 4 made of resin (polyvinyl chloride or the like) that connects the branch pipe 3A and the lead water supply pipe 2.

The connection pipe 4 and the water supply pipe 2 are drawn and fixed by pulling and fixing the connecting flange 4b formed at the downstream end of the connection pipe 4 with a union nut 2A screwed into the male screw 2a at the tip of the water supply pipe 2. And are connected in a watertight state.
Among them, the intermediate part of the connection pipe 4 exposed between the tip of the branch pipe 3A and the lead water supply pipe 2 is a part to be cut and separated for removal.

  Further, in this water supply pipe removing method, the tube connection portion Ja of the cheese J is cut and separated at the set cutting position P, and the channel opening 5 of the cut end surface 4a of the tube connection portion Ja is closed in a watertight state. Water pressure (fluid pressure) of the device A, the flow blocking device B that closes the set closed portion upstream of the cutting position in the cheese J in a watertight state, and the cutting and closing device A with respect to the tube connection portion Ja of the cheese J The disengagement prevention tool C that prevents disengagement movement due to the above, the entire cheese J and a part of the water pipe 1 to which the cheese J is attached can be surrounded in a watertight state, and the flow path opening of the cut end face 4a of the pipe connection portion Ja 5 and the protective case D in which the connection port portion 50A is formed at the portion facing the portion 5 are used as the main fluid equipment.

  Of these, the cutting and closing device A will be described in detail. As shown in FIGS. 3 to 7, as shown in FIGS. A plate-like cutting closure body 11 having a blade portion 11a for cutting the connection portion Ja and an opening closing portion 11b capable of closing the flow passage opening 5 of the cutting end surface 4a of the pipe connection portion Ja cut by this; Cutting operation means A1 for moving the cutting closure body 11 in the cutting direction in an orientation perpendicular to the branch pipe axis (tube axis) Y of the pipe connecting portion Ja is assembled.

  The housing 10 includes a lower case portion 10A and an intermediate case portion 10B having split surfaces along a horizontal plane passing through the branch pipe axis Y of the pipe connection portion Ja, and an upper case that seals the upper opening portion of the intermediate case portion 10B. The storage space 12 for the cutting closure body 11 is formed by the internal space of the intermediate case portion 10B and the internal space of the upper case portion 10C.

  The lower semi-inner peripheral surface 10a of the lower case portion 10A and the upper semi-inner peripheral surface 10b of the intermediate case portion 10B are larger in inner diameter than the outer diameter of the branch pipe 3A of the cheese body 3 as shown in FIG. In addition, it is configured to have an installation length that can be armored over the branch pipe 3A and the exposed intermediate portion of the connection pipe 4.

The lower half inner circumferential surface 10a of the lower case portion 10A and the upper half inner circumferential surface 10b of the intermediate case portion 10B are one of the constituent members of the pipe connection portion Ja as shown in FIGS. A first seal portion 13a that contacts the outer peripheral surface of the branch pipe 3A to make it watertight, and a second seal portion that contacts the outer peripheral surface of the exposed intermediate portion of the connecting pipe 4 that is the other of the constituent members of the pipe connecting portion Ja and makes it watertight. An inner sealing material 13 formed in a cylindrical shape having a seal portion 13b and a cylindrical outer sealing material 14 having a two-part structure located on the radially outer side of the inner sealing material 13 are provided.
In addition, when using a sheet-like sealing material as the inner side sealing material 13, this sheet-like sealing material is wound cylindrically on the spot. Moreover, when using the sealing material shape | molded by the cylindrical shape, the circumferential direction one location of this cylindrical sealing material is cut | disconnected, or it forms in multiple in the circumferential direction.

  As shown in FIGS. 4 and 7, the maximum width of the blade portion 11 a of the cutting closure body 11 is larger than the outer diameter of the exposed intermediate portion of the connecting pipe 4 and the inner diameter of the inner peripheral surface of the outer seal member 14. The blade portion 11a is the same as or slightly smaller than the inner diameter of the inner peripheral surface of the outer seal member 14 when viewed in the direction of the branch pipe axis Y. It is formed in a semicircular arc shape or U shape with a radius of

  As shown in FIGS. 3 and 5, the inner seal member 13 and the outer seal member 14 have a portion corresponding to the cutting movement path of the blade portion 11 a of the cutting closure body 11 than the thickness of the cutting closure body 11. A thin linear cut L is formed.

  As shown in FIGS. 6 and 7, the blade portion 11 a of the cutting closure body 11 pushes and widens the cut L of the inner sealing material 13 and the outer sealing material 14, or the bottom position of the inner peripheral surface of the outer sealing material 14 or In the state in which it is pushed and moved to the cutting end position corresponding to the position near the branch pipe axis Y side, the annular end surface of the inner sealing material 13 and the outer sealing material 14 where the cuts L are formed is the opening of the cutting closure body 11. The outer periphery side part of the closing part 11b is contacted in a compressed state, and the space between the cut closing body 11 and the cut end surface 4a of the connecting pipe 4 is kept sealed in a watertight state.

  Moreover, as shown in FIG. 3, FIG. 5, it is equivalent to the range from the front-end | tip of the branch pipe 3A of the cheese main body 3 to the rotational operation axial center of cutting | disconnection operation means A1 among the 2nd seal | sticker parts 13b of the inner side sealing material 13. The thickness of the part is formed to be as thin as the thickness of the first seal portion 13a, and the operation load during cutting by the blade portion 11a of the cutting closure body 11 is reduced.

  As shown in FIG. 4 and FIG. 7, the lower case portion 10 </ b> A and the intermediate case portion are disposed at one side portion in the diameter direction of the pipe connecting portion Ja among the joint portions of the lower case portion 10 </ b> A and the intermediate case portion 10 </ b> B. 10B is provided with a hinge portion 15 that pivotally connects the shaft 10B so as to be swingable and openable around a horizontal axis Y1 along the branch tube axis Y direction.

  Moreover, as shown to FIG. 4, FIG. 7, in the other side part of the diameter direction of the pipe connection part Ja in the junction part of 10 A of lower case parts and the intermediate case part 10B, with respect to the pipe connection part Ja of cheese J The first fixing means 16 provided with bolts 16A and nuts 16B for fastening and fixing the housing 10 in the exterior state is provided, and by the fastening fixing operation of the first fixing means 16, the lower side of the lower case portion 10A is provided. The inner sealing material 13 and the outer sealing material 14 provided on the semi-inner peripheral surface 10a and the upper-side semi-inner peripheral surface 10b of the intermediate case portion 10B are compressed to a watertight state.

  As shown in FIGS. 3 to 5, the cutting operation means A <b> 1 includes a rotation operation shaft 17 that is rotatable around an operation axis center in a cutting direction that is pivotally supported by the upper case portion 10 </ b> C, and a screw portion of the rotation operation shaft 17. The screw piece 18 is formed with a non-rotatable screw piece 18, and an attachment surface 18 a for attaching the cutting closure body 11 with a second fixing means 19 such as a screw is formed on the screw piece 18.

  In addition, the upper end portion of the rotation operation shaft 17 protruding from the upper case portion 10C is formed with a square shaft portion 17a to which a rotation operation handle (not shown) is detachably fitted and mounted in an integrally rotated state.

Next, the flow path closing device B used in the water supply pipe removing method will be described in detail.
In this flow path closing device B, as shown in FIGS. 10 to 12, the branch pipe upstream of the cut closure 11 in the cheese J, in other words, upstream of the cut end face 4 a of the connection pipe 4. Blocking means B1 that can block the set blocking part in 3A, and the blocking means B1 in the cheese J from the downstream opening 10d in the casing 10 of the cutting closing device A corresponding to the flow path opening 5 of the cutting end surface 4a And a closing operation means B2 for sending the set closing portion and closing the same.

  As shown in FIG. 11, the closing means B1 is branched to the first pressing member 31 provided with the first pressing surface 31a on the operating screw shaft 30 with the bolt-use head 30a and the first pressing surface 31a. Between the 2nd press member 32 provided with the 2nd press surface 32a which faces the pipe-axis Y direction, and the 1st press surface 31a of this 1st press member 31, and the 2nd press surface 32a of the 2nd press member 32 The first pressing member 31 is second pressed in accordance with the screwing operation of the rubber cylindrical elastic sealing material 33 disposed in the middle and the large-diameter male screw portion 30b formed at the intermediate portion of the operation screw shaft 30. An operation nut 34 that moves close to the member 32 side is externally configured.

In the assembled state, the head 30 a of the operation screw shaft 30 contacts the back surface of the second pressing member 32, and the operation nut 34 contacts the back surface of the first pressing member 31.
In addition, a small-diameter connecting screw portion 30c is formed at one end portion of the operation screw shaft 30 and is a screw reverse to the male screw portion 30b.

  When the operation nut 34 screwed into the male screw portion 30b of the operation screw shaft 30 is rotated forward (rotated in the clockwise direction), the second pressing surface 32a of the second pressing member 32 is The first pressing surface 31a of the first pressing member 31 moves close to the elastic member 33, and the elastic sealing material 33 is bulged and deformed to the enlarged diameter side, and is pressed against the set blocking portion in the branch pipe 3A of the cheese J in a watertight state. Then, the flow path in the branch pipe 3A is closed.

  On the contrary, when the operation nut 34 is reversely rotated (rotated counterclockwise), the first pressing surface 31a of the first pressing member 31 is opposed to the second pressing surface 32a of the second pressing member 32. Accordingly, the elastic sealing material 33 is contracted and deformed to the reduced diameter side by its elastic restoring force, so that the blocking of the flow path in the branch pipe 3A is released.

  As shown in FIGS. 10 to 12, the closing operation means B <b> 2 includes an inner operation shaft provided with a connection screw cylinder portion 35 a that is detachably screwed to a connection screw portion 30 c at one end of the operation screw shaft 30. 35 and an outer operation shaft 36 having a rotation operation cylinder portion 36a that is detachably attached to the operation nut 34 of the closing means B1 from the branch pipe axis Y direction in an integrally rotated state are provided as main components. .

  The outer operation shaft 36 is externally rotatable with respect to the inner operation shaft 35 and is externally slidably operated in the branch pipe axis Y direction. The inner operation shaft 35 and the outer operation shaft 36 are closed. The connecting screw portion 30c and the operation nut 34 of the operation screw shaft 30 in B1 are configured to be separable from the branch pipe axis Y direction.

  Specifically, in the closed state in which the elastic sealing material 33 of the closing means B1 is in watertight pressure contact with the set closing portion in the branch pipe 3A, the inner operation shaft 35 is loosened with respect to the operation screw shaft 30 of the closing means B1. When the rotation operation (rotation operation in the clockwise direction) is performed, the threaded connection between the connection screw portion 30c of the operation screw shaft 30 and the connection screw cylinder portion 35a of the inner operation shaft 35 is released and separated.

  Further, when the outer operation shaft 36 is slid to the disengagement side along the branch pipe axis Y direction with respect to the operation nut 34 of the closing means B1, the rotation operation cylinder portion 36a of the outer operation shaft 36 is fitted from the operation nut 34. Detached and separated.

  Next, the separation preventing tool C used in the water supply pipe removing method will be described in detail. As shown in FIGS. 6 and 8 to 10, this detachment prevention tool C is a pair of armorable externally from the branch pipe axis Y direction of the branch pipe 3 </ b> A with respect to both side portions of the cheese body 3 in the water pipe axis X direction. The U-shaped bolt 40 and the connection 10 formed integrally with the casing 10 of the cutting and closing device A and having bolt insertion holes (not shown) formed at portions corresponding to both screw bolt portions 40a of each U-shaped bolt 40. A flange portion 41 and a first nut 42 screwed into both screw bolt portions 40a of each U-bolt 40 projecting from each bolt insertion hole of the connecting flange portion 41 are configured.

  The lengths of both screw bolt portions 40a of each U-shaped bolt 40 are determined according to the mounting amount of the casing 10 of the cutting / closing device A and the mounting of a first work case 43 (described later) that houses the closing means B1 of the flow path closing device B. The length is set so as to allow for the allowance, and by using both U-shaped bolts 40, the first work case 43 can be easily and efficiently attached.

  The first work case 43 is attached to a portion of the first work case 43 that is integrally formed on the outer surface of the connection port 43a side and that corresponds to the screw bolt portions 40a of each U-bolt 40. The thickness of the connecting flange portion 43A in which the bolt insertion hole is formed, and the screw of the second nut 44 screwed into the both screw bolt portions 40a of each U-bolt 40 protruding from each bolt insertion hole of the connection flange portion 43A. It is configured to be larger than the sum of the combined mounting length.

  Next, the protective case D that can be used in the water pipe removal method, the water pipe laying method, and the like will be described in detail. As shown in FIGS. 14 to 19, the protective case D has a storage space 49 in which the entire cheese J and a part of the water pipe 1 to which the cheese J is attached can be stored in a watertight state (sealed state). And the division | segmentation protective case 50 divided into two by the plane which passes along the water pipe axis X of the water pipe 1 and the branch pipe axis Y of the branch pipe 3A is provided as main components.

  As shown in FIGS. 14 and 15, the two split protective cases 50 are provided with third fixing means including bolts 52 </ b> A and nuts 52 </ b> B in a state of sandwiching the annular packing 51 mounted in the packing mounting recess 50 a on the joint surface. By being clamped and fixed at 52, it is configured to be held and fixed in a watertight state at both outer side portions of the cheese J in the water pipe 1 in the direction of the water pipe axis X.

  A connection port portion 50A is formed at a portion of the split protection case 50 facing the flow path opening 5 of the cut end surface 4a of the tube connection portion Ja of the cheese J, and also on the entire circumference of the inner peripheral surface of the connection port portion 50A. A part of the packing 51 is exposed in a protruding state.

  A plug (plug body) 53 and a ball valve 54 (see FIGS. 17 to 19), which is an example of other fluid equipment, can be selectively connected to the connection port portion 50A of both split protective cases 50. The inner plug 55 is clamped and fixed in a watertight state by a tightening and fixing operation using the bolts 52 </ b> A and nuts 52 </ b> B of both split protective cases 50.

  The inner plug 55 includes a first flange 55 a that can contact the inner surfaces of the two divided protective cases 50, a second flange 55 b that can contact the outer surfaces of the two divided protective cases 50, and a male screw portion of the plug 53. And a threaded cylindrical portion 55c formed with a female screw that can be alternatively screwed with the male threaded portion of the connecting short pipe 56 threadedly connected to the ball valve 54.

  Further, one split protective case 50 is formed with a threaded hole 50b used for watertight inspection or the like, and a water stop plug 57 is detachably attached to the threaded hole 50b.

Next, a method for removing the water supply pipe using the above main fluid equipment will be described in detail.
As shown in FIG. 1, a resin cheese J pipe connection portion Ja attached to the water pipe 1, specifically, a resin cheese fitted and connected to the ends of both water pipes 1 in a watertight state. 1 shows a water pipe system in which a branch pipe 3A of a main body 3 and a lead water supply pipe 2 are connected by a connecting pipe 4 made of resin.
In this water pipe system, the following steps (1) to (7) are executed, and the lead water supply pipe 2 with the possibility of lead elution is maintained in the water distribution pipe 1 without changing the flow of clean water. Remove in water.

  In addition, in this 1st Embodiment, it becomes the water supply pipe removal method which removes the unnecessary lead water supply pipe 2, removes water, and prepares for the construction work of the new water supply pipe after dredging.

(1) Cutting preparation step As shown in FIG. 1, first, the set cutting position P of the cutting / separation target portion of the connection pipe 4 exposed between the tip of the branch pipe 3 </ b> A and the lead water pipe 2. In addition, the annular groove 60 for cutting guidance is formed by a commercially available cutting tool such as a pipe cutter or a saw, or a cutting tool.
The cutting guide annular groove 60 assists the cutting of the connecting pipe 4 by the cutting closing body 11 of the cutting closing device A, and has a V-shaped or I-shaped cross section at a depth smaller than the thickness of the connecting pipe 4. It is formed in a shape.

(2) Mounting process of cutting and closing device A As shown in FIGS. 2 to 5, the casing 10 of the cutting and closing device A is watertight in a state that spans the branch pipe 3 </ b> A of the cheese body 3 and the exposed intermediate portion of the connecting pipe 4. Wear in the state.
When the housing 10 is mounted, the lower case portion 10A is opened and swung by the hinge portion 15 with respect to the intermediate case portion 10B of the housing 10, and the cut closure body 11 protruding from the storage space 12 of the intermediate case portion 10B. The tip of the blade portion 11 a is aligned with the cutting guiding annular groove 60 formed at the set cutting position P of the connecting pipe 4.

  The intermediate case portion 10B and the lower case portion 10A of the casing 10 that is in the open posture in this aligned state are sheathed across the branch pipe 3A and the connecting pipe 4, and the intermediate case portion 10B and the lower case portion 10A Is clamped and fixed to the branch pipe 3A and the connecting pipe 4 in a watertight state by a fastening and fixing operation using the bolts 16A and nuts 16B of the first fixing means 16.

  Next, both U-shaped bolts 40 of the separation prevention tool C are sheathed from both sides of the cheese body 3 in the direction of the distribution pipe axis X from the branch pipe axis Y direction of the branch pipe 3A. After the screw bolt portion 40a is inserted into the bolt insertion hole of the connecting flange portion 41 formed integrally with the casing 10 of the cutting and closing device A, the screw bolt portion 40a of each U-bolt 40 protruding from each bolt insertion hole The first nut 42 is screwed and fixed.

(3) Cutting process by the cutting / closing device A As shown in FIGS. 6 and 7, a rotation operation handle (not shown) is attached to the angular shaft portion 17 a of the rotation operation shaft 17 protruding from the upper case portion 10 </ b> C of the housing 10. When the rotation operation handle 17 is rotated and the rotation operation shaft 17 is rotated forward in the clockwise direction, the screw piece 18 to which the cutting closing body 11 is attached is sent to the connecting pipe 4 side, and the cutting closing body 11 is mounted. The set cutting position P of the connecting pipe 4 is cut and separated along the cutting guiding annular groove 60 by the blade portion 11a.

  In a state where the blade portion 11a of the cutting closing body 11 has reached the cutting end position corresponding to the bottom position of the inner peripheral surface of the outer sealing material 14 or a position nearer to the branch pipe axis Y side than that, the opening of the cutting closing body 11 is opened. The flow path opening 5 of the cut end surface 4a of the connecting pipe 4 is closed by the closing portion 11b, and the annular end surface of the inner sealing material 13 and the outer sealing material 14 where the cuts L are formed is the opening closing portion 11b of the cutting closing body 11. The outer peripheral side part is contacted in a compressed state, and the space between the cut-off closing body 11 and the cut end face 4a of the connecting pipe 4 is kept sealed in a watertight state.

Next, as shown in FIG. 6, the connection pipe portion 4A on the distal end side of the connection pipe 4 cut and separated and the lead water supply pipe 2 to which it is connected are removed.
At this time, the connecting pipe portion 4B on the proximal end side of the water supply pipe 2 is left in the branch pipe 3A of the cheese body 3.

(4) Mounting Step of Channel Closure Device B As shown in FIGS. 8 to 11, each bolt is inserted into the connecting flange portion 43A of the first working case 43 in which the block means B1 of the channel blockage device B is accommodated. The holes are attached to both screw bolt portions 40a of each U-shaped bolt 40, and the second nuts 44 are screwed into the both screw bolt portions 40a of each U-shaped bolt 40 protruding from each bolt insertion hole of the connecting flange portion 43A. Tighten and fix.

  At this time, the second packing 45 attached to the connection port 43a of the first working case 43 is pinched from the end surface of the downstream opening 10d in the casing 10 of the cutting and closing apparatus A from the direction of the branch pipe axis Y. The connection opening 43a of the first work case 43 and the downstream opening 10d of the housing 10 are connected in a watertight state.

  The outer operation shaft 36 of the closing operation means B2 is supported in a watertight manner so as to be rotatable and slidable in the branch tube axis Y direction with respect to the bottom wall portion 43b of the first working case 43.

(5) Blocking Step by Channel Closure Device B As shown in FIG. 12, the angular shaft portion 17a of the rotation operation shaft 17 of the cutting closing device A is rotated back to the return side by the rotation operation handle, and is at the cutting end position. The cutting closure body 11 is moved back to the standby position on the storage space 12 side formed by the internal space of the intermediate case portion 10B and the internal space of the upper case portion 10C.

  Next, the first handle 46 provided at the proximal end portion of the outer operation shaft 36 of the closing operation means B2 and the second handle 47 provided at the proximal end portion of the inner operation shaft 35 are pushed in to close the closing operation means B2. The means B1 is sent from the flow path opening 5 of the cut end face 4a of the connecting pipe 4 to the set blocking portion in the branch pipe 3A of the cheese body 3.

  Thereafter, when the first handle 46 of the outer operation shaft 36 is rotated to the larger diameter side while the second handle 47 of the inner operation shaft 35 is gripped, the rotation operation cylinder portion 36a of the outer operation shaft 36 is fitted. The operation nut 34 is rotated forward (rotated clockwise), and the first pressing surface 31a of the first pressing member 31 moves closer to the second pressing surface 32a of the second pressing member 32, and accordingly. The elastic sealing material 33 bulges and deforms toward the diameter-expanding side and is pressed against the set blockage site in the branch pipe 3A of the cheese J in a watertight state, so that the flow path in the branch pipe 3A is blocked.

(6) Removal Step of the First Working Case 43 of the Channel Blocking Device B and the Cutting and Closing Device A As shown in FIGS. 12 and 13, the second handle 47 is removed from the inner operation shaft 35, and this inner operation shaft 35 is removed. The outer operation shaft 36 is extracted from the outer side, and the second nut 44 on the outer side that is screwed to the both screw bolt portions 40a of both U-shaped bolts 40 of the disengagement prevention tool C is removed, and the casing 10 of the cutting and closing device A The first work case 43 is removed from the downstream opening 10d.

  Next, after removing the first nut 42 screwed into both screw bolt portions 40a of both U-shaped bolts 40 and removing both U-shaped bolts 40 from the connecting flange portion 41 and the cheese body 3 of the housing 10, The bolts 16A and nuts 16B of the first fixing means 16 that fasten and fix the intermediate case portion 10B and the lower case portion 10A of the cutting and closing device A are loosened, and the casing 10 of the cutting and closing device A is made of cheese J Remove from branch pipe 3A.

  Thereafter, as shown in FIG. 14, the connecting screw cylinder portion 35a of the inner operating shaft 35 is loosened with respect to the connecting screw portion 30c of the operating screw shaft 30 of the closing device B1 while the closing device B1 is maintained in the closed state. The inner operation shaft 35 is removed from the connecting screw portion 30c.

(7) Water stop treatment process by protective case D As shown in FIGS. 14 to 16, both split protective cases 50 of the protective case D are disposed on both outer sides of the cheese J in the water pipe axis X direction in the water pipe 1. Are installed in a state that hermetically seals the entire cheese J, and both split protective cases 50 are tightened with bolts 52A and nuts 52B of the third fixing means 52 so that both sides of the cheese J in the distribution pipe axis X direction in the distribution pipe 1 Both split protective cases 50 are clamped and fixed to the outer side portion in a watertight state.

The plug 53 is screwed and fixed to the inner plug 55 that is clamped and fixed in a watertight state to the connection port portion 50A of both split protective cases 50, and the cheese J is surrounded and sealed in a watertight state.
When the water stop process by the protective case D is completed, it will be prepared for the construction work of a new water pipe after dredging.

[Second Embodiment]
In the water supply pipe removing method (fluid pipe removing method) of this embodiment, the process up to the preparation stage of the new water pipe laying work is executed.
That is, in the first embodiment described above, the connection between the operation screw shaft 30 and the inner operation shaft 35 of the closing means B1 is released, and the protective case D is attached to perform the water stop treatment. This second embodiment Then, the protective case D is mounted while maintaining the connection between the operating screw shaft 30 and the inner operating shaft 35 of the closing means B1, and a ball as an opening / closing valve as an example of other fluid equipment is installed in the inner plug 55 of the protective case D. The process until the valve | bulb 54 is mounted | worn and the obstruction | occlusion means B1 left in the branch pipe 3A of cheese J is removed is performed.

  Next, although the water supply pipe removal method of 2nd Embodiment is explained in full detail, as shown in FIG. 13, the block | closed means B1 to which the inner side operation shaft 35 was connected is left in the branch pipe 3A of cheese J. The steps up to here are omitted in the description of the first embodiment, and the subsequent steps will be described.

(8) Mounting process of the protective case D, mounting process of the ball valve 54, and mounting process of the second work case 48 for recovering the closing means B1 As shown in FIG. The two split protective cases 50 of the protective case D are packaged on both outer sides in the direction so as to hermetically surround the entire cheese J, and the split protective cases 50 are bolts 52A and nuts of the third fixing means 52. By tightening 52B, the two split protective cases 50 are clamped and fixed to the outer side portions of the water distribution pipe 1 in the direction of the water pipe axis X of the cheese J in a watertight state.

  The connecting port portion 54A on the upstream side of the ball valve 54 is screwed and attached to the inner plug 55, which is clamped and fixed to the connecting port portion 50A of both split protective cases 50 in a watertight state, via the connecting short pipe 56. To do.

A second working case 48 having a storage chamber 48a capable of storing the closing means B1 operated in the closed state is screwed and connected to the connection port portion 54B on the downstream side of the ball valve 54 in a watertight state.
In the bottom wall portion 48b of the second working case 48, the outer operation shaft 36 of the closing operation means B2 is penetratingly supported in a watertight state so as to be rotatable and slidable in the branch pipe axis Y direction.

  In a state in which the second working case 48 is connected to the ball valve 54, the outer operation shaft 36 covers the inner operation shaft 35, and the rotary operation cylinder portion 36a at the tip of the outer operation shaft 36 operates the closing means B1. The nut 34 is fitted in an integrally rotated state so as to be detachable from the branch pipe axis Y direction.

(9) Recovery Step of Closing Means B1 As shown in FIG. 18, when the first handle 46 of the outer operation shaft 36 is rotated to the reduced diameter side while the second handle 47 of the inner operation shaft 35 is gripped, the outer operation is performed. The operation nut 34 in which the rotation operation cylinder portion 36 a of the shaft 36 is fitted is reversely rotated (rotated counterclockwise), and the first pressing member 31 is against the second pressing surface 32 a of the second pressing member 32. The first pressing surface 31a is moved away, and the elastic sealing member 33 is contracted and deformed to the reduced diameter side by its elastic restoring force, and the blocking of the flow path in the branch pipe 3A is released. It becomes a state.

  Next, by pulling out the first handle 46 of the outer operation shaft 36 and the second handle 47 of the inner operation shaft 35 of the closing operation means B2, the closing means B1 in the release state of the closing operation is changed to the inner plug 55 of the protective case D. Then, it is collected in the second working case 48 via the inside of the connecting short pipe 56 and the ball valve 54.

(10) Removal Step of Channel Closure Device B As shown in FIG. 19, after the valve body 54a of the ball valve 54 is closed, the second work case 48 of the channel blockage device B is removed from the ball valve 54. Remove.

  In addition, since the other structure is the same as the structure demonstrated in 1st Embodiment, the same number is attached to the same structure location as 1st Embodiment, and the description is abbreviate | omitted.

  Moreover, in above-mentioned 2nd Embodiment, as shown in FIG. 13, both the division | segmentation of the protective case D is carried out in the state by which the obstruction | occlusion means B1 to which the inner side operation shaft 35 was connected was left in the branch pipe 3A of cheese J. Although the protective case 50 is mounted in a watertight state, the first work case 43 is removed by removing the first handle 46 and the second handle 47 while the inner operation shaft 35 and the outer operation shaft 36 are connected to the closing means B1. If this is possible, the process of FIG. 13 may be omitted and the process may proceed to the process of FIG.

[Other Embodiments]
(1) In the above-described embodiment, in the cutting and closing process by the cutting and closing device A, the connecting pipe 4 which is one constituent member of the pipe connecting portion Ja is formed by pressing the blade portion 11a accompanying the feeding of the cutting and closing body 11. The cutting and closing body 11 is configured to be cut and separated at the set cutting position P. However, as the cutting closure body 11, a disk saw that cuts and separates at the set cutting position P of the pipe connecting portion Ja by driving rotation, or the pipe connecting portion Ja by driving reciprocating movement. A plate-like saw that cuts and separates at the set cutting position P may be used.
In short, as the cutting and closing body 11 of the cutting and closing apparatus A, the blade portion 11a for cutting the pipe connection portion Ja and the flow path opening 5 of the cut end surface 4a of the pipe connection portion Ja cut by this can be closed. Any configuration having an opening closing portion 11b may be used.

  (2) In the above-described embodiment, the cheese J is described as an example of the pipe joint, but other mechanical joints such as a socket and an elbow may be used.

  (3) In the above-described embodiment, in configuring the detachment prevention tool C, from the outer surface of the connecting flange portion 41 integrally formed with the casing 10 of the cutting and closing device A and the bolt insertion holes of the connecting flange portion 41. Although it has been configured so as to prevent the detachment movement due to the fluid pressure of the cutting and closing device A by contact with the first nut 42 screwed into both screw bolt portions 40a of each protruding U-shaped bolt 40, the cutting and closing device A The housing 10 of the cutting and closing device A is clamped and fixed by two first nuts 42 screwed into both screw bolt portions 40a of each U-shaped bolt 40, or each U-shaped bolt 40 is You may comprise so that it may clamp and fix between the 1st nut 42 screwed together by both the screw bolt parts 40a, and the outer surface of the cheese main body 3. FIG.

(4) In the above-described embodiment, the branch pipe 3A of the resin cheese body 3 that constitutes the pipe connection portion Ja of the cheese J, and the resin connection pipe 4 that connects the branch pipe 3A and the water supply pipe 2 Among them, the intermediate portion of the connection pipe 4 exposed between the tip of the branch pipe 3A and the tip of the lead water supply pipe 2 is cut and separated, but even if it is cut and separated in the branch pipe 3A of the cheese body 3 Good.
Moreover, when the lead water supply pipe 2 is directly connected to the branch pipe 3A of the cheese body 3, since the pipe connecting portion Ja is constituted by the branch pipe 3A, the connection portion with the lead water supply pipe 2 is used. The intermediate part of the branch pipe 3A except for is cut and separated.

  (5) In the above-described embodiment, the protective case D is divided into two divided protective cases 50 by a plane passing through the distribution pipe axis X of the distribution pipe 1 and the branch pipe axis Y of the branch pipe 3A. However, the protective case D may be divided into three or more divided structures.

(6) In the above embodiment, the ball valve 54 as an on-off valve is connected to the inner plug 55 of the protective case D via the connecting short pipe 56. You may connect directly to the plug 55.
Further, instead of the ball valve 54, another on-off valve such as a gate valve may be used.

  (7) In the above-described embodiment, the plug 53 and the ball valve 54 that is an on-off valve as an example of other fluid equipment are selected with respect to the inner plug 655 provided in the connection port portion 50A of both split protection cases 50. However, other fluid equipment may be a piping material or the like.

  (8) As the channel closing device B, the set blocking portion in the branch pipe 3A upstream of the cut closure body 11 in the cheese J, in other words, upstream of the cut end surface 4a of the connection pipe 4 is blocked. Possible closing means B1 and the closing means B1 are sent from the downstream opening 10d in the casing 10 of the cutting and closing device A corresponding to the flow path opening 5 of the cutting end face 4a to the set closing part in the cheese J for closing operation As long as the closing operation means B2 is provided, the flow path closing device B having any structure may be used.

A cutting and closing device A1 cutting operation means B flow passage closing device B1 closing means B2 closing operation means C detachment prevention tool D protective case J pipe fitting (cheese)
Ja Pipe connection 1 Fluid main pipe (water pipe)
2 Fluid pipe (water supply pipe)
4a Cutting end face 5 Flow path opening 10 Housing 10d Opening (downstream opening)
11 Cutting Closure 11a Blade 11b Opening Closure 48 Working Case (Second Working Case)
50A Connection port 53 Plug 54 Open / close valve (ball valve)
56 Other fluid equipment (short pipe for connection)

Claims (8)

A method of removing a fluid pipe to be removed connected to a pipe connection part of a pipe joint in an uninterrupted state,
A cutting closure body having a blade part for cutting the pipe connection part and an opening closing part capable of closing the flow path opening of the cut end face of the pipe connection part cut by the pipe connection part of the pipe joint; Attaching a cutting closing device comprising a cutting operation means for moving the cutting closing body in the cutting direction;
The cutting operation means of the cutting and closing device is operated to feed the cutting and closing body to cut and separate the pipe connecting portion at a set cutting position, and the flow opening on the cutting end surface of the pipe connecting portion is A step of closing at the opening closing portion;
A closing means capable of closing a set closing portion upstream of the cutting closure body in the pipe joint, and the closing means from the opening of the cutting closing device corresponding to the flow path opening to the set closing portion. A step of mounting a flow path closing device provided with a closing operation means for sending and closing;
After the cutting closing means at the opening closing position is returned to the opening opening position by the cutting operation means of the cutting and closing device, the closing means is sent from the flow path opening to the set blocking portion in the pipe joint. And operating the closing means with the closing operation means into a closing state;
Removing the cutting and closing device while leaving the closing means in a closed state;
Perform the fluid tube removal method.   The fluid pipe removing method according to claim 1, wherein in the attaching step of the cutting and closing device, a removal preventing tool for preventing separation movement due to fluid pressure of the cutting and closing device with respect to a pipe connection portion of the pipe joint is attached.   3. The fluid pipe removing method according to claim 1, wherein, in the cutting and closing step of the cutting and closing device, the pipe connecting part is cut and separated at a set cutting position by pressing the blade part accompanying the feeding of the cutting and closing body.   After the removal process of the cutting and closing device, the closing means other than the closing means or the closing means and the closing operation means in the flow path closing device are removed, and the entire pipe joint and this are mounted. A step of mounting a protective case in which a part of the fluid main pipe can be enclosed in a sealed state and a connection port portion is formed at a portion of the cut end surface of the pipe connection portion facing the flow path opening is executed. The fluid pipe removing method according to any one of claims 1 to 3.   The fluid pipe removing method according to claim 4, wherein a step of sealing the connection port portion of the protective case with a plug is performed in a state where only the blocking means of the flow path blocking device is left after the mounting step of the protective case.   After the step of attaching the protective case, a step of connecting an opening / closing valve to a connection port portion of the protective case and connecting a work case capable of storing the closing means to the opening / closing valve; The closing means is operated to be released from the closed state, the closing means is collected in the working case via the open / close valve, and the open / close valve is closed, and then the working case is removed. The fluid pipe removing method according to claim 4, wherein the step of performing is performed.   It is the said protective case used for the fluid pipe removal method of any one of Claims 4-6, Comprising: The inside plug which can selectively connect a plug and another fluid equipment to the said connection port part. Protective case provided.   It is the said cutting closing device used for the fluid pipe removal method of any one of Claims 1-6, Comprising: On the housing | casing of the division structure which can be mounted | worn from the radial direction with respect to the pipe connection part of the said pipe joint. The cutting closure body and the cutting operation means are provided, and the inner peripheral surface of the casing is provided with a sealing material that seals between the cutting closure body and the cutting end surface of the pipe connecting portion Closing device.

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