JP2000088173A - Piping structure, existing pipe cutting construction method, flow non-cutting-off valve insertion construction method, sluice valve element and flow non- cutting-off insertion valve device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a piping structure capable of decreasing the size of a closed case and hardly occurring breakage of an existing pipe, and to provide an existing pipe cutting method and a water supply non-cutting-off valve insertion method. SOLUTION: This piping structure comprises an existing pipe 1 having a groove-form cut groove 12C notched throughout a range of approximate 180 deg. in a peripheral direction of the existing pipe 1, a closed case divided into a plurality of sections in the peripheral direction of the existing pipe 1 and surrounding in an airtight state the existing pipe 1, and a rubber packing 8d making contact with the inner peripheral surface 1b of the existing pipe 1 and a cut surface 12f forming the cut groove 12C in the existing pipe 1 in a closed state. A rubber packing 8d is forced into pressure contact with the inner peripheral surface 1b and a cut surface 12f by movement through the closed case in the radial direction of the existing pipe 1 and penetration of fluid from the cut groove 12C through the existing pipe 1. A sluice valve element 8a is provided to stop the flow of fluid in the existing pipe 1 and a valve stem is provided to radially move the valve element 8a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a piping structure, an existing pipe cutting method, a method for inserting a non-disruptive flow valve, a gate valve used in the method, and a valve device for inserting a non-disruptive flow.

2. Description of the Prior Art Conventionally, a method of inserting a valve into an existing pipe by drilling an existing pipe with uninterrupted water and inserting a valve into a hole of the existing pipe in a pipeline including the existing pipe is well known.

FIGS. 28 (a) and 28 (b) show USPN
o. The outline of the conventional method of inserting a continuous water valve disclosed in 3,948,282 is shown. In the prior art shown in FIG.
The existing pipe 1 of (a) is surrounded by a closed case 800. Next, a work gate valve 801 and the like are attached to the sealed case 800. After that, according to a well-known method, the hole saw 80
2, a circular hole 803 is formed in the existing pipe 1. After this perforation, as shown in FIG. 28B, a valve element 804 that fits into the perforated circular hole 803 is inserted.

In this conventional valve insertion method, the existing pipe 1
Since a hole 803 having a diameter substantially equal to the inner diameter of
(A) The sealed case 800 becomes longer in the tube axis direction and becomes larger. Further, in this prior art, the water pressure is applied to the valve body 804 of FIG. 28B over a large area corresponding to a circular hole, so that the diameter of the valve rod 806 increases. Moreover, in this valve insertion method, the hole 80 in the existing pipe 1 is not used.
3 becomes thinner and the pressure from the valve body 804 is applied to the peripheral portion 805, so that the existing pipe 1 is easily damaged.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and has as its main objects to provide a piping structure, an existing pipe cutting method, and a non-disruptive valve insertion method capable of reducing the size of a sealed case. It is to be. Further, another object of the present invention is to provide a pipe structure, an existing pipe cutting method, and a non-disruptive valve insertion method, in which an existing pipe is hardly damaged.
Still another object of the present invention is to provide a gate valve or the like inserted by such a method.

In order to achieve the above object, a piping structure according to the present invention includes an existing pipe, a sealed case, and a gate valve. The existing pipe has a groove-shaped cutting groove cut out over a range of about 180 ° in a circumferential direction of the existing pipe. The sealed case is divided into a plurality of pieces in the circumferential direction of the existing pipe and surrounds the existing pipe in an airtight state. In the closed state, the gate valve body has a rubber packing that comes into contact with an inner peripheral surface of the existing pipe and a cutting surface of the existing pipe that forms the cutting groove. The gate valve element moves in the sealed case in the radial direction of the existing pipe, and enters the existing pipe from the cutting groove, so that the rubber packing stops the flow of the fluid in the existing pipe.

In a preferred embodiment of the present invention, the groove-shaped cutting groove is formed by cutting an existing pipe with a cutting tool.
Further, in a preferred embodiment of the present invention, the angle between the cutting surface at both ends in the circumferential direction of the cutting groove and the surface of the existing pipe in the portion is set to an angle larger than 45 °, More preferably, it is set in the range of 45 ° to 90 °. In a further preferred embodiment of the present invention, both ends in the circumferential direction of the cutting groove are formed in a substantially U shape.

[0008] The piping structure of the present invention is completed, for example, by cutting an existing pipe by the existing pipe cutting method of the present invention and then inserting the valve into the pipe by the non-disruptive valve insertion method of the present invention.

That is, according to the existing pipe cutting method of the present invention, first, a part of the existing pipe is hermetically surrounded by a plurality of hermetically sealed cases which are divided in the circumferential direction of the existing pipe.
A cutting tool, which is rotatably supported around an axis set in the radial direction of the existing pipe and has a plurality of cutting blades on the tip end surface and the outer peripheral surface of the column, is attached to the sealing case in a state where the cutting tool is attached. Store in case. Then, the cutting tool is rotated in the radial direction of the existing pipe while the cutting tool is rotated around the axis line by the power of a motor to perform a cutting motion of cutting the existing pipe by rotation of the cutting tool. Sending, by rotating at least a part of the sealed case in the circumferential direction of the existing pipe, rotating the cutting tool in the circumferential direction to cause the cutting tool to perform a feeding motion, thereby causing the existing pipe to move. Is cut in the circumferential direction over a range of about 180 ° by the cutting tool.

[0010] According to the cutting method of the present invention, the valve is inserted into the pipe after the existing pipe is cut by about 180 ° with the cutting tool. The gate valve element of the valve enters the existing pipe from the cut groove and cuts off the groove and presses against the inner peripheral surface of the existing pipe to close the existing pipe.

In the present invention, the "existing pipe" means a pipe in which a fluid such as water is flowing, and is generally buried underground. The term "sealed" does not mean completely closed, but means that water (air) tightness is maintained so that construction can be performed with continuous water (flow). Therefore, the “sealed case” refers to a case having a pressure resistance capable of withstanding the pressure of the fluid flowing in the existing pipe and a certain degree of water stopping performance. Further, "surrounding in an airtight state" means cutting or sealing to such an extent that it does not interfere with operations such as valve insertion after cutting.For example, a drain port is provided in the sealed case, The drain may be opened during cutting, and chips may be discharged together with water from the drain.

The "cutting tool" used in the present cutting method has a plurality of cutting blades.
It does not include tools or cutter wheels with a single continuous cutting edge. Here, in the present specification, the term “columnar” means that in addition to a cylinder, a truncated cone, a shape obtained by adding a cone to a cylinder, and a conical shape are also included. Further, the cutting tool may have a column shape whose length is shorter than the outer diameter of the cutting tool. When cutting an existing pipe having a mortar lining on the inner surface of the pipe, a cutting tool provided with a large number of cutting blades (tips) made of cemented carbide or a cutting tool using diamond particles as the cutting blade is used. It is preferably used.

Further, in the present invention, "cutting" refers to cutting a part of a pipe wall by rotating a plurality of cutting blades. In addition, the `` cutting motion '' refers to rotating a plurality of cutting blades, while the `` feeding motion '' refers to a position where a new portion of a pipe wall can be cut one after another by the cutting tool. Moving the cutting tool. In the present invention, "while sending the cutting tool in the radial direction of the existing pipe,
"Rotating the closed case in the circumferential direction" means that after the cutting tool is sent in the radial direction of the existing pipe, the cutting tool is sent in the radial direction of the existing pipe (while sending) in addition to rotating the closed case. , Including rotating the sealed case.

In the present invention, "inserting a valve (into a pipe line)" does not mean that a valve or a partition valve body is physically inserted into a cut and removed portion of an existing pipe. Means to install a valve for adjusting the water stoppage or flow rate of the pipeline in the pipeline. In this cutting method,
"Cut over the range of about 180 degrees in the circumferential direction."
Means cutting the existing pipe over a range in which the gate valve element having a size similar to the inner diameter of the existing pipe can be inserted from the cutting groove, and is generally smaller than about 180 ° of about 150 ° to 170 °. Set to value.

On the other hand, the gate valve of the present invention enters the existing pipe through an opening formed in the existing pipe, and the first valve of the gate valve.
A gate valve body in which a rubber packing portion contacts a cutting surface forming an opening of the existing pipe, and a second rubber packing portion contacts an inner peripheral surface of the existing pipe to close the valve. The existing pipe is cut in the pipe radial direction with a cutting tool having a cutting blade along the surface and the cylindrical surface, and then the cutting tool is moved along the circumferential direction of the pipe so that about 180
The first rubber packing portion has a contact surface corresponding to a cutting surface of the groove-shaped opening formed in the range of °.

Further, the valve device (gate valve) for non-stop flow insertion of the present invention is divided into a plurality of pieces in the circumferential direction of the existing pipe, and partially surrounds the existing pipe in an airtight state. A sealing case rotatable around the existing pipe in the airtight state; and the gate valve housed in the sealing case. In the above-mentioned piping structure and construction method, it is difficult to directly grasp the apparatus for implementing the piping structure and construction method as infringement, so that the scope of rights can be easily defined before construction. Rights are also claimed for the sluice valve element and the valve device for non-disruptive insertion.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be more clearly understood from the following description of the preferred embodiments with reference to the accompanying drawings. However, the examples and drawings are merely for illustration and description, and the scope of the present invention is defined by the appended claims. In the accompanying drawings, the same part numbers in a plurality of drawings indicate the same or corresponding parts.

First Embodiment FIGS. 1 to 12 show a first embodiment. Hereinafter, the existing pipe cutting method and the non-stop water valve insertion method of the first embodiment will be described in the order of steps.

The cutting apparatus as shown in (a cutting machine) 2, in this embodiment, a first closed casing 2A of the central pair of left and right second closed casing 2B. As shown in FIG. 1, the first sealed case 2A is divided into first and second divided cases 221 and 222 divided in a circumferential direction.
And a guide bush 222a. The second sealed case 2B (FIG. 2) is also divided into two parts in the circumferential direction. As shown in FIG.
1 (FIG. 2), 222, 2A, and 2B, and between the second sealed case 2B and the existing pipe 1 are sealed with a rubber ring 224 or the like.

The second split case 222 has a branch portion 222b that protrudes radially outward of the existing pipe 1 in a radial direction C, and the branch portion 222b is connected to the branch portion 222b via the guide bush 222a. The main bearing 232 is in the radial direction C of the existing pipe 1.
Slidably and reciprocally. A rubber ring 224 seals the space between the guide bush 222a, the branch portion 222b, and the main bearing 232. The branched portion 2 in the second split case 222
The opening 22b into which the columnar cutting tool 230 enters is provided at 22b.
2c is formed.

A cutting bush 222a fixed to the first sealed case 2A is connected to a cutting machine 3 via a main bearing 232.
Is attached. That is, the main bearing 232
Above is a first motor for tool rotation (an example of a prime mover)
231 are fixed. On the other hand, the cutting tool 230 is disposed inside the main bearing 232. The cutting tool 230 is formed integrally with a main shaft (cutter shaft) 233 rotatably supported by the main bearing 232. The first motor 231 is connected to the output shaft 23 of the first motor 231.
The cutting tool 230 is rotated via the coupling 1 a and the coupling 234 fixed to the main shaft 233.

As shown in FIG. 3B, the cutting tool 2
30 has a plurality of cutting blades 230f on the distal end surface 230d and the outer peripheral surface 230e of a substantially column. The main shaft 233 is formed integrally with the cutting tool 230.
As shown in FIG. 1, the cutting tool 230 and the spindle 23
The third axis 233 a is set in the radial direction C of the existing pipe 1. The cutting tool 230 is provided in the radial direction C of the existing pipe 1.
The cutting motion is performed by rotating around the axis 233a set at.

The branched portion 222b shown in FIG.
The cut feed frame 236 is fixed. The cut feed frame 236 includes a long bolt 236a fixed to the branch portion 222b, and a top plate 236b fixed to an upper end of the long bolt 236a. The bush 23 provided on the top plate 236b of the cut feed frame 236
6c is screwed with a cut feed male screw 237.

The main bearing 232 advances in the cutting direction C by rotating the cutting feed male screw 237 and screwing it in the cutting direction C. Therefore, by sending the cutting tool 230 in the cutting direction C together with the main bearing 232 while rotating the cutting tool 230 to cause the cutting tool 230 to enter the opening 222c, as shown in FIG. The existing pipe 1 can be cut. The guide bush 222a is fixed to the cutting and feeding frame 236 via the connection fitting 238 shown in FIG. 1, and is collected together with the cutting and feeding frame 236 after cutting is completed.

In this embodiment, a case rotating device 4 shown in FIG. 2 for rotating the first closed case 2A around the existing pipe 1 is provided. The case rotation device 4 has a pair of second motors 242 for rotating the case. The second motor 242
Rotates the drive gear 244 for case rotation via the output shaft 247. The drive gear 244 rotates a case rotation driven gear 245 fixed to the first closed case 2A. Therefore, the cutting tool 2 in the cutting state of FIG.
30 while rotating the first closed case 2A to the existing pipe 1
The existing pipe 1 can be cut to form the cut groove 12C in FIG.

As shown in FIG. 3, the second closed case 2B
Constitutes a displacement prevention tool 5A. The second sealed case 2B is divided into two in the circumferential direction R of the existing pipe 1 (FIG. 1). The second sealed case 2B is provided with
A number of set screws 251 are provided at each location in the circumferential direction R (FIG. 1). The first closed case 2A and the second closed case 2B have a rotation guide portion 250 that slides through a liner 252 in the tube axis direction S and the radial direction with respect to each other. The pair of second sealed cases 2B are fixed to the existing pipe 1 by set screws 251. The second sealed case 2
B guides the first sealed case 2A to prevent the first sealed case 2A from shifting or blurring in the pipe axis direction S of the existing pipe 1. Therefore, the first sealed case 2A smoothly rotates when rotating around the existing pipe 1.
Note that a ball bearing or the like may be used instead of the liner 252.

The cutting process Next, the procedure of cutting. First, while a fluid (water) is flowing in the existing pipe 1 of FIG. 2, the operator attaches the first and second sealed cases 2A and 2B to the existing pipe 1 and also uses the assembling bolts 228 of FIG. The divided cases 221 and 222 are assembled. Thus, as shown in FIG. 2, the first and second sealed cases 2A and 2B are
Is hermetically sealed. The cutting machine 3 is attached to the guide bush 222a of the first closed case 2A in advance.

Next, as shown in FIGS. 5A and 5B, a cutting position by the cutting tool 230 is set.
That is, the case rotating device 4 of FIG. 2 is driven to rotate the first closed case 2A and the cutting machine 3 until the axis 233a of the cutting tool 230 becomes substantially horizontal.

Next, the operator operates the first motor 231 of FIG.
Is driven, the first motor 231
0 around the axis 233a of the main shaft 233,
The rotation of the cutting tool 230 causes a cutting motion to cut the existing pipe 1. In the state where the cutting motion is being performed, when the operator drives the cutting feed male screw 237 in the cutting direction C, as shown by a two-dot chain line in FIG.
The tip surface 230d of the cutting tool 230 is the pipe wall 1a of the existing pipe 1.
To a position that penetrates a part of. Thus, cutting tool 2
The cutting by 30 is completed.

After the cutting, the operator drives the second motor 242 for rotating the case shown in FIG.
44 and the driven gear 245, the first closed case 2
A rotates around the existing pipe 1 while being guided by the second sealed case 2B. As a result, the cutting tool 230 becomes the first
Around 180 along the outer circumference of the existing pipe 1 together with the closed case 2A.
By rotating around the main shaft 233 while rotating by ° (eg, 160 °), the existing pipe 1 is cut into a semi-annular shape, and a cutting groove 12C is formed in the existing pipe 1. That is, the second motor 242 (FIG. 1) rotates the cutting tool 230 in the circumferential direction R by rotating the first sealed case 2 </ b> A in the circumferential direction R of the existing pipe 1 (FIG. 1), As shown in FIGS. 5B to 5C, the cutting tool 230 is given a feeding motion. Thus, the cutting tool 230 cuts the existing pipe 1 into a semi-annular shape, and forms a cutting groove 12C in the existing pipe 1. After the completion of the cutting, the cutting tool 230 is returned to the original position as shown by a two-dot chain line. Thereafter, the operator removes the case rotation device 4 of FIG. The main bearing 23
A drain valve may be attached to 2 and chips from the drain valve may be discharged from the drain valve.

The cutter removal step Subsequently, in the manner described below, the operator removes the cutter 3. That is, as shown in FIG. 6, a work gate valve 273 is joined to the branch portion 222b.
The work upper tank 274 is overlapped and joined to 73. At the time of this joining, the operator feeds the cut-and-feed frame 23 to the distal end of the elevating shaft
6 are joined. After this joining, the operator removes the nut 239. After the removal, the operator moves the lifting shaft 27 of FIG.
6, the cutting machine 3 is taken out of the first closed case 2A into the upper working tank 274. After the removal, the operator closes the work gate valve 273. After the valve is closed, the operator disconnects the work upper tank 274 from the work gate valve 273.

Next, the structure of the gate valve of the valve inserted into the pipe will be described. The valve includes a gate valve body 8a shown in FIG. A rubber packing 8d is mounted on the gate valve body 8a. When the gate valve body 8a enters the existing pipe 1 through the cutting groove 12C, the rubber packing 8d closes the cutting groove 12C, and the inner surface 1 of the existing pipe 1 is closed.
b. That is, the rubber packing 8d is
(C), as shown in FIG. 9 (d), the cutting surface 1 of the cutting groove 12C.
The first rubber packing portion 8d1 pressed against 2f and the existing pipe 1
And a second rubber packing portion 8d2 which is pressed against the inner peripheral surface 1b. It should be noted that the gate valve 8a has the first and second valves shown in FIGS. 9 (a) and 9 (b).
The first for mounting the rubber packing portions 8d1 and 8d2
And second mounting grooves 8a1 and 8a2.

The valve insertion process then accommodated in the operator working the upper tank 274 of the valve cover 8b and the gate valve body 8a in FIG. 10, joining the working upper tank 274 in the working sluice valve 273. The gate valve 8A includes a spindle 8c that opens and closes the gate valve body 8a. When the spindle 8c is rotated, the gate valve 8A of FIG. 8 moves the gate valve body 8a of FIG.
And a rubber packing 8 provided on the gate valve body 8a.
d is the cutting surface 12 f of the existing pipe 1 and the inner peripheral surface 1 of the existing pipe 1
A valve to be pressed against b is formed. That is, the existing pipe 1
Constitutes a part of the valve box of the gate valve 8A.

After attaching the upper work tank 274 shown in FIG. 10, the operator opens the work gate valve 273 and lowers the elevating shaft 276 as shown in FIG. This allows
The valve lid 8b contacts the branched portion 222b. After this contact,
The operator joins the valve lid 8b and the branched portion 222b with the flange bolt 8e. After this joining, the operator removes the work upper tank 274 and the work gate valve 273.
Thereafter, the worker pushes the rubber ring 264 into the packing insertion portion 260 of the second sealed case 2B in FIG. 12 and attaches the split ring 265 to the second sealed case 2B. Thus, the gate valve 8A is arranged at a position corresponding to the cutting groove 12C, and the gate valve 8A is inserted into the pipeline 1A.

Here, in the first embodiment, the rubber packing 8 is provided on the cutting surface 12f and the inner peripheral surface 1b of the existing pipe 1 in FIG.
Since d presses against, that is, because the existing pipe 1 is used as a valve box, a large external force is applied to the existing pipe 1. However, in the present embodiment, the cutting groove 12C formed in the existing pipe 1 is used.
Is small, and in particular, there is no thin portion in the existing pipe 1. Therefore, when the pipe 1A is closed by the gate valve 8a, the existing pipe 1 is not likely to be damaged. When the gate valve body 8a is closed, the gate valve body 8a is connected to the first rubber packing portion 8a1.
Is supported on the cutting surface 12f in the pipe axis direction S through
The valve element 8a is less likely to be distorted even when receiving pressure at the time of stopping water. Also,
Since the width of the cutting groove 12C is small, the force for pushing the valve body 8a upward by water pressure is also small. Therefore, the spindle 8c can be made thin.

In the first embodiment, the closed case is provided with the first
Although a part of the sealed case, that is, the first sealed case 2A is rotated by dividing into the sealed case 2A and the second sealed case 2B, in the present invention, the first sealed case 2A and the second sealed case 2B are rotated. May be integrally formed. In this case, a shift preventing device is separately provided beside the sealed case, and the whole sealed case is rotated. An example of this is shown in the following second embodiment.

Second Embodiment FIGS. 13 to 24 show a second embodiment. Hereinafter, in the second embodiment, after describing the sealed case, the piping structure will be described.

Sealed Case As shown in FIG. 13A, the sealed case 2 is divided into first and second divided cases 211 and 212.
The division surface 215 is sealed by the rubber packing 214 of FIG. In addition, the two divided cases 211 and 211
The twelve divided surfaces 215 are made to metal touch each other. In addition, at both ends of the closed case 2, FIG.
Packing insert 26 into which rubber ring 264 is pressed
0 is provided.

As shown in FIG. 14B, a bolt insertion hole 217 for fixing a valve lid and a bolt insertion hole for fixing a partition valve for operation are formed in the flange 216 of the second divided case 212 in FIG. 218 are formed. Reference numeral 219 denotes a hole for inserting an assembly bolt.

Piping Structure FIGS. 15 to 18 show a piping structure. In FIG. 15, a cutting groove 12C is formed in the existing pipe 1. As shown in FIG. 16, the cutting groove 12 </ b> C
It is notched over a range of 80 °. The cutting groove 12
C is formed by cutting the existing pipe 1 with a cutting tool described later. The cutting groove 12C is, as shown in FIG.
Both ends 12c1 in the circumferential direction are formed in a substantially U-shape.
As described above, since both end portions 12c1 of the cutting groove 12C draw a smooth curve, the sealing of the both end portions 12c1 becomes easy. The portion of the cutting groove 12C other than the both ends 12c1 is formed to have a constant groove width.

The angle of the cut surface 12f forming the cut groove 12C with respect to the surface 1c of the existing pipe 1 in the portion is set in the range of 45 ° to 90 °. That is, as shown in FIG. 16, the existing pipe 1
The peripheral portion of C does not have a thin portion.
Therefore, as shown in FIGS. 17 and 18, even if the rubber packing 8d of the valve body 8a is pressed against the cutting surface 12f, there is no possibility that the existing pipe 1 is damaged. Therefore, the gate valve 8A can be opened and closed many times.

The closed case 2 is divided into two parts in the circumferential direction R of the existing pipe 1 and is sealed by a rubber packing 214 to surround the existing pipe 1 in an airtight state. The first split case 211 is formed along the outer peripheral surface of the existing pipe 1. On the other hand, the second divided case 212 has a moving hole 212d in which the gate valve body 8a moves in the radial direction C of the existing pipe 1.
have. The second split case 212 includes a valve cover 8
b is fixed. The valve lid 8b closes the moving hole 212d of the second divided case 212. The valve lid 8
The b and the second divided case 212 form a space for accommodating the gate valve 8a when the valve is opened in FIG.

As shown in FIG. 17, the gate valve body 8a has a rubber packing 8d. The rubber packing 8d is
A cutting surface 12f forming a cutting groove (shown by a broken line in FIG. 18)
The first rubber packing 8d1 that contacts the inner pipe 1b and the second rubber packing 8d2 that contacts the inner peripheral surface 1b of the existing pipe 1 are integrally formed. The rubber packing 8d is a gate valve 8
It is molded by being baked integrally with a.

The gate 8a is a spindle (valve rod).
When 8c is rotated, it moves in the radial direction C of the existing pipe 1 in the closed case 2 as shown in FIGS.
The gate valve body 8a enters the existing pipe 1 from the cutting groove 12C, so that the rubber packing 8d comes into contact with the cutting surface 12f and the inner peripheral surface 1b of the existing pipe 1 so that the fluid in the existing pipe 1 is removed. Stop the flow. In addition, the inner peripheral surface 1b of the existing pipe 1 of the present embodiment.
Is formed by mortar lining.

Cutting device (cutting device) As shown in FIG.
First and second divided cases 211 and 212
And a guide bush 212a.

The second split case 212 has a branch portion 212b that protrudes in a radially outward direction of the existing pipe 1 in the radial direction C, and is connected to the branch portion 212b through the guide bush 212a. The main bearing 232 is in the radial direction C of the existing pipe 1.
Slidably and reciprocally. FIG.
As shown in (a), a space between the guide bush 212a, the branch portion 212b, and the main bearing 232 is sealed by a rubber ring 214. Second split case 2
An opening 212c into which the columnar cutting tool 230 enters is formed in the branch portion 212b in FIG.

A cutting machine 3 is mounted on a guide bush 212 a fixed to the closed case 2 via a main bearing 232. That is, a tool rotation motor (an example of a prime mover) 231 is fixed above the main bearing 232. On the other hand, inside the main bearing 232,
The cutting tool 230 is provided. Cutting tool 230
Are integrally formed with a main shaft (cutter shaft) 233 rotatably supported by the main bearing 232. The motor 23
1 is an output shaft 231a and a main shaft 23 of the motor 231.
3 through the coupling 234 fixed to the cutting tool 2
Rotate 30.

As shown in FIG. 21 (b), the cutting tool 230 has a plurality of cutting blades 230f on the substantially cylindrical distal end surface 230d and the outer peripheral surface 230e. The main shaft 233 is formed integrally with the cutting tool 230. In the present embodiment, as shown in FIG.
Is tapered to provide a tapered portion 230t in the cutting tool of FIG. 21 (b). Further, the tapered portion 23
In order to prevent 0t from entering too much toward the center of the existing pipe 1, the cutting tool 230 has a cutting stopper 230s.
Is fixed. The cutting stopper 230s is made of a hard resin, and it is preferable to form a groove for allowing cutting chips to escape in the cutting stopper 230s. In this embodiment, the cutting stopper may not be provided on the cutting tool 230 but may be provided on the guide bush 212a. As shown in FIG. 19, the axis 233a of the cutting tool 230 and the main shaft 233 is
It is set in the radial direction C of the existing pipe 1. The cutting tool 2
Numeral 30 performs a cutting motion by rotating around the axis 233a set in the radial direction C of the existing pipe 1.

An infeed frame 236 is fixed to the branch portion 212b shown in FIG. The cutting feed frame 236 includes a long bolt 236a fixed to the branch portion 212b, and a top plate 236b fixed to the upper end of the long bolt 236a. A cut feed male screw 237 is screwed into a bush 236c provided on the top plate 236b of the cut feed frame 236.

The main bearing 232 advances in the cutting direction C by rotating the cutting feed male screw 237 and screwing it in the cutting direction C. Accordingly, by sending the cutting tool 230 together with the main bearing 232 in the cutting direction C while rotating the cutting tool 230 to cause the cutting tool 230 to enter the opening 212c, as shown in FIG. The existing pipe 1 can be cut. The guide bush 212a is fixed to the cutting and feeding frame 236 via a connection fitting 238 shown in FIG. 19, and is collected together with the cutting and feeding frame 236 after cutting is completed.

As shown in FIG. 20, on both sides of the closed case 2 are provided shift preventing devices 5. The displacement prevention device 5
Is fixed to the existing pipe 1 with a number of set screws 251.
It is in contact with both sides of the sealed case 2 via the liner 252. Thereby, the displacement preventing device 5 guides the sealed case 2 to prevent the sealed case 2 from shifting or blurring in the pipe axis direction S of the existing pipe 1. Therefore, the closed case 2 rotates smoothly when rotating around the existing pipe 1. In addition, reference numeral 253 denotes a liner
This is a pressing screw that presses against the screw 12.

Cutting Step Next, a cutting procedure will be described. First, while the fluid (water) is flowing in the existing pipe 1 in FIG. 20, the worker attaches the sealed case 2 to the existing pipe 1 and assembles the two divided cases 211 and 212 with an unillustrated assembling bolt. Thus, as shown in FIG.
The existing pipe 1 is surrounded in an airtight state. The cutting machine 3 is attached to the guide bush 212a of the closed case 2 in advance.

Next, FIGS. 23 (a) and 23 (b)
As shown in (5), a cutting position by the cutting tool 230 is set. That is, the operator rotates the sealed case 2 and the cutting machine 3 to a position at which the axis 233a of the cutting tool 230 becomes substantially horizontal by human power or a winch.

Next, when the operator drives the motor 231 of FIG. 19, the motor 231 rotates the cutting tool 230 around the axis 233a of the main shaft 233, and the existing pipe 1 is rotated by the rotation of the cutting tool 230. A cutting motion for cutting is performed. In the state where the cutting motion is being performed, when the operator screws the cutting feed male screw 237 in the cutting direction C, the cutting tool is eventually formed as shown by a two-dot chain line in FIG. The distal end surface 230d of 230 advances to a position where it penetrates a part of the pipe wall 1a of the existing pipe 1. At this time, the cut stopper 230 s in FIG. 22 abuts on the outer peripheral surface of the existing pipe 1. Thus, the cutting by the cutting tool 230 is completed.

After this cutting, FIGS. 23B through 23
An operator rotates the sealed case 2 around the existing pipe 1 as shown in FIG. Thereby, the cutting tool 230 rotates around the axis 233a while rotating about 180 ° (for example, 160 °) along the outer circumference of the existing pipe 1 together with the closed case 2 to cut the existing pipe 1 into a semi-annular shape. Then, a cutting groove 12C is formed in the existing pipe 1. Thereby, as shown in FIGS. 23C and 24, the cutting tool 230 cuts the existing pipe 1 into a semi-annular shape, and forms a cutting groove 12C in the existing pipe 1. After the completion of the cutting, the cutting tool 230 shown in FIG.
Is returned to the original position as shown by the two-dot chain line.

[0056] cutter removal step Subsequently, in a manner similar to the foregoing embodiments, the operator removes the cutter 3, further, as shown in FIGS. 15 and 16,
The gate valve 8A is inserted into the pipe 1A at a position corresponding to the cutting groove 12C.

As described above, in the present piping structure, since the width of the cutting groove 12C in FIG. 15 is small, the size of the sealed case 2 can be reduced.

By the way, the cutting tool for cutting the cutting groove 12C of the present invention has a truncated conical shape as shown in FIG.
The shape may be conical as shown in FIG. 5 (b) or cylindrical as shown in FIG. 25 (c). As the cutting blade 230f, in addition to the carbide tip, FIGS.
As shown in (c), a large number of diamond particles may be employed.

The method for cutting the existing pipe 1 is as follows.
It is not always necessary to rotate the sealed case 2, and FIG.
As shown in (d), the cutting groove 12C may be formed by moving the substantially cylindrical cutting tool 230 in the circumferential direction R in parallel.
Further, as another cutting method, as shown in FIG.
The cutting groove 12C may be formed by pressing the side surface of the cutting tool 230 formed of a cylindrical milling cutter against the existing pipe 1.

Next, the gate valve body 8a according to the present invention will be described by changing its expression. This gate valve element 8a is the same as the existing pipe 1 shown in FIG.
Intrudes into the existing pipe 1 from an opening (cutting groove) 12C formed in the pipe, and the first rubber packing portion 8d1 of the gate valve body 8a is pressed against the cutting surface 12f forming the opening 12C of the existing pipe 1. At the same time, the second rubber packing portion 8d2 is pressed against the inner peripheral surface 1b of the existing pipe 1 to close the valve. The first rubber packing portion 8d1 cuts the existing pipe 1 in the pipe diameter direction C with a cutting tool 230 having a tip surface 230d and a cutting blade 230f along a substantially cylindrical surface in FIG. 3, and then as shown in FIG. Then, the cutting tool 230 is moved (rotated) along the circumferential direction of the pipe to correspond to the cutting surface 12f of the groove-shaped opening 12C formed over a range of about 180 ° in the circumferential direction of the existing pipe 1. Having a pressure contact surface.

Here, if the cutting groove 12C in FIG. 8 is narrower in the pipe axis direction S than the circular opening, the sealed case 2 becomes smaller in the pipe axis direction and the gate valve 8a reduces the water pressure. The receiving area becomes smaller. Therefore, in the present invention, while the opening 12C is formed in a groove shape narrower in the pipe axis direction S than in the pipe diameter direction, the first rubber packing portion 8d
It is only necessary that 1 has a shape along the cutting surface 12f of the groove-shaped opening 12C.

As shown in FIG. 26, in the gate valve body 8a of the present invention, both ends 8d3 of the first rubber packing portion 8d1 in pressure contact with the cutting surface 12f in the pipe diameter direction are connected to the second rubber packing portion. A step portion is formed with respect to 8d2, and the step portion 8d3 has a surface 8d5 that intersects the intrusion direction C of the gate valve body 8a. Such an intersection plane 8d5
Prevents the existing pipe 1 from being damaged from both ends of the cutting groove 12C even if it comes into contact with the cutting surface 12f with a large force.

As shown in FIG. 9, the first rubber packing portion 8d1 in each of the above-described embodiments has a pair of first rubber packing portions each formed along the cross section of the existing pipe 1 except for both ends 8d3 in the pipe diameter direction. It has a press contact surface 8d4. In addition, the first rubber packing portion 8d1 is configured to connect the two first press contact surfaces 8d4 to the both end portions 8d4.
It has a substantially U-shaped second pressure contact surface 8d5 connected at d3. In the second press contact surface 8d5, the first rubber packing portion 8d1 in FIG. 26 is curved in the pipe axis direction S and the pipe circumferential direction R toward the second rubber packing portion 8d2 at both ends in the pipe radial direction. Is formed.

In the above-described embodiment, an example in which cutting is performed with the column-shaped cutting tool 230 has been described. However, in the present invention, cutting may be performed with the disk-shaped cutting tool 230 as shown in FIG. In this case, as shown in FIG. 26 (b), the cutting groove 12C does not have a U-shape at both ends and has a constant width W.
However, this case is also included in the scope of the present invention.

In each of the above embodiments, the gate valve 8a is housed in the closed case 2 after cutting. However, in the present invention, the gate valve 8a may be housed in the closed case 2 before cutting. (For example, USP 4,516,598 and 1,989,768).

In the present invention, the existing pipe 1 is closed with the gate valve 8a inserted into the pipe, and then the gate valve 8a is fixed with a stopper bolt to form the valve lid 8b constituting the gate 8A.
Alternatively, the valve stem 8c or the like may be removed, a lid may be attached instead, and the gate valve body 8a may be used as a stopper.

Next, another method of using the gate valve body 8a will be described with reference to FIG. In FIG. 27A, the gate valve body 8a has the first pressure contact surface 8d4 on only one side.
Now, a bypass (branch pipe) 300 is connected to the valve 8A, and after the gate valve element 8a is lowered to close the valve, the existing pipe 1 is cut and the mechanical cap 301 shown in FIG. Thereafter, when the gate valve body 8a is raised, the flow of the existing pipe 1 can be directed to the bypass 300 side. That is, the case where the gate valve body 8a has the first pressure contact surface 8d4 on only one side is also included in the scope of the present invention. In other words, the gate valve body 8a does not need to be in contact with all of the cutting surface 12f forming the cutting groove 12C, but may be in contact with only one side.

In the present invention, the rubber packing 8d of the gate valve body 8a may cover both side surfaces 8a3 of the gate valve body 8a shown in FIG.
The entire part of the pipe a that enters the existing pipe 1 may be covered.

As described above, the preferred embodiments have been described with reference to the drawings. However, those skilled in the art can easily envisage various changes and modifications within the obvious scope by referring to the present specification. There will be. For example, an engine may be used in addition to a motor as a prime mover for giving a cutting motion to a cutting tool. Alternatively, the prime mover may be installed on the ground, and the power of the prime mover may be transmitted to the cutting tool via a cutter shaft by a flexible shaft. After the existing pipe is surrounded by the sealed case, a cutting tool may be attached to the sealed case. Furthermore, after cutting the existing pipe 1, a branch pipe may be connected to the closed case via a gate valve. When cutting an existing pipe with a cutting tool, the cutting tool is
It is generally preferable to send the pipe toward the center in the radial direction of the existing pipe. However, in the present invention, the pipe need not be sent to the center but may be sent in the radial direction. Further, the closed case may be divided into three or four in the circumferential direction. Further, the valve body may be inserted from any direction such as above, side, or below. Further, the present invention can be applied to gas pipes as well as water pipes. That is, the fluid flowing through the existing pipe is not limited to water but may be another fluid such as gas or oil, which is included in the scope of the present invention. Accordingly, such changes and modifications are to be construed as being within the scope of the invention as defined by the appended claims.

[0070]

As described above, according to the present invention,
A cutting tool whose axis is set in the radial direction of the existing pipe is sent in the circumferential direction of the existing pipe to cut the existing pipe in a groove shape . for that reason,
Because the peripheral edge of the cutting groove in the existing pipe does not become thin,
When the valve element fits into the cutting groove, there is no possibility that the existing pipe is damaged. In addition, since there is no possibility of damaging the existing pipe, a large force can be applied to the sealing surface (press-contact surface), so that the sealing performance is improved. In the present invention, the opening to be cut has a width in the pipe axis direction larger than that of the circular hole.
Is small , the load applied to the gate valve body by the water pressure is reduced, so that the diameter of the valve stem can be reduced, and the sealed case becomes shorter in the pipe axis direction.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a sealed case showing a first embodiment of an existing pipe cutting method of the present invention.

FIG. 2 is a longitudinal sectional view showing the whole of a closed case, a cutting machine, and the like.

FIG. 3A is a longitudinal sectional view mainly showing a cutting machine before cutting. FIG. 3B is a front view of the columnar cutting tool.

FIG. 4 is a longitudinal sectional view showing a cutting machine after cutting.

FIGS. 5 (a), 5 (b) and 5 (c) are process diagrams showing a cutting procedure.

FIG. 6 is a longitudinal sectional view showing a state where the work upper tank is assembled after cutting.

FIG. 7 is a sectional view showing a state where a cutting machine is removed.

FIG. 8 is a perspective view showing a valve body and a cutting groove.

FIG. 9 (a) is a side view of a rubber packing. FIG. 9B is a front view of the rubber packing. FIG. 9C is a longitudinal sectional view showing a closed state of the existing pipe. FIG. 9D is a cross-sectional view showing a closed state of the existing pipe.

FIG. 10 is a cross-sectional view showing a state in which a valve element, a valve cover, and the like of a gate valve are housed in an upper tank.

FIG. 11 is a sectional view when the valve is inserted.

FIG. 12 is a sectional view showing a completed state.

FIG. 13 (a) is a partially sectional side view of a sealed case according to a second embodiment. FIG. 13B is a bottom view of the second split case.

14A is a cross-sectional view showing a state in which a sealed case is attached to an existing pipe, and FIG. 14B is a plan view of a second split case.

FIG. 15 is a longitudinal sectional view showing a completed state when the valve is opened.

FIG. 16 is a cross-sectional view of the same.

FIG. 17 is a longitudinal sectional view showing a completed state when the valve is closed.

FIG. 18 is a cross-sectional view of the same.

FIG. 19 is a transverse sectional view of a sealed case showing a second embodiment of the existing pipe cutting method of the present invention.

FIG. 20 is a longitudinal sectional view showing the whole of a sealed case, a cutting machine, and the like.

FIG. 21 (a) is a longitudinal sectional view mainly showing a cutting machine before cutting. FIG. 21B is a sectional view of a columnar cutting tool.

FIG. 22 is a longitudinal sectional view showing a cutting machine after cutting.

23 (a), 23 (b) and 23
(C) is a process drawing showing the procedure of cutting.

FIG. 24 is a longitudinal sectional view showing a state after cutting.

25 (a), 25 (b) and 25
(C) is a front view which shows the modification of a cutting tool, respectively. FIG. 25D is a cross-sectional view showing another method of forming a cutting groove of the present piping structure. FIGS. 25E and 25F are perspective views showing still another method.

26 (a) is a perspective view showing another example of the gate valve body, and FIG. 26 (b) is a perspective view showing another example of the cutting groove.

FIG. 27 is a schematic sectional view showing another example of the piping structure.

FIG. 28 (a) is a cross-sectional view showing a conventional non-water drilling method. FIG. 28B is a sectional view showing a conventional valve insertion method.

[Explanation of symbols]

 1: Existing pipe 1a: Pipe wall 1b: Inner peripheral surface 2: Sealed case 2A: First sealed case 2B: Second sealed case 8A: Gate valve (valve device for continuous flow insertion) 8a: Gate valve 8b: Valve lid 8c: spindle (valve rod) 8d: rubber packing 8d1: first rubber packing portion 8d2: second rubber packing portion 12C: cutting groove 12f: cutting surface 211: first split case 212: second split case 212b: branching portion 212d: moving hole 221: first divided case 222: second divided case 222b: branched portion 230: cutting tool 230d: distal end surface 230e: outer peripheral surface 230f: cutting blade 2311: first motor (for tool rotation) C: Cutting direction (radial direction) R: circumferential direction S: tube axis direction

Claims (19)

[Claims] 1. An existing pipe having a groove-shaped cutting groove which is notched over a range of about 180 ° in a circumferential direction of the existing pipe, and an existing pipe divided into a plurality of pieces in the circumferential direction of the existing pipe. A sealed case surrounding in an airtight state, and, in a closed state, having a rubber packing in contact with an inner peripheral surface of the existing pipe and a cutting surface forming the cutting groove in the existing pipe, A gate valve that moves in the radial direction of an existing pipe and penetrates into the existing pipe from the cutting groove, whereby the rubber packing presses against the inner peripheral surface and the cutting surface to stop the flow of fluid in the existing pipe. A piping structure comprising a body and 2. An existing pipe having a groove-shaped cutting groove cut out over a range of about 180 ° in a circumferential direction of the existing pipe, and the existing pipe is divided into a plurality of pieces in the circumferential direction of the existing pipe. A sealed case surrounding in an airtight state, and, in a closed state, having a rubber packing in contact with an inner peripheral surface of the existing pipe and a cutting surface forming the cutting groove in the existing pipe, A gate valve that moves in the radial direction of an existing pipe and penetrates into the existing pipe from the cutting groove, whereby the rubber packing presses against the inner peripheral surface and the cutting surface to stop the flow of fluid in the existing pipe. A piping structure, comprising: a body; and a valve stem for moving the valve body in the radial direction. 3. The piping structure according to claim 1, wherein the cutting groove is formed by cutting with a cutting tool. 4. The piping structure according to claim 3, wherein an angle between a cutting surface at both ends in a circumferential direction of the cutting groove and a surface of the existing pipe at the portion is set to be larger than 45 °. . 5. The cutting groove according to claim 4, wherein both ends of the cutting groove in the circumferential direction are substantially U-shaped.
Piping structure formed in the shape of a letter. 6. The piping structure according to claim 5, wherein a portion of the cutting groove other than both ends of the cutting groove is set to have a constant groove width. 7. The sealed case according to claim 1, wherein the sealed case has a first divided case formed along an outer peripheral surface of the existing pipe, a moving hole in which the gate valve moves, and an open case. A piping structure, comprising: a second divided case accommodating at least a part of a gate valve body at the time of a valve; and a valve lid closing the moving hole of the second divided case. 8. A part of an existing pipe is hermetically surrounded by a plurality of hermetically sealed casings divided in a circumferential direction of the existing pipe, and is rotatable around an axis set in a radial direction of the existing pipe. And a cutting tool having a plurality of cutting blades on the tip end surface and the outer peripheral surface of the column, respectively, is accommodated in the sealed case in a state where the cutting tool is attached to the sealed case, and the cutting tool is driven by a motor. While rotating around the axis to perform a cutting motion for cutting the existing pipe by rotation of the cutting tool, the cutting tool is sent in a radial direction of the existing pipe, and at least a part of the sealed case is By rotating the cutting tool in the circumferential direction of the existing pipe, the cutting tool is rotated in the circumferential direction to cause the cutting tool to perform a feeding motion, and the existing pipe is rotated in the circumferential direction by the cutting tool. Existing pipe cutting method for cutting over a range of about 180 °. 9. The cutting method according to claim 8, wherein the cutting tool is sent toward a center in a radial direction of the existing pipe to a position where the cutting tool penetrates a part of a pipe wall of the existing pipe. An existing pipe cutting method for causing the cutting tool to perform the feed motion while performing the cutting motion in a state where the tool penetrates the pipe wall. 10. The cutting tool according to claim 8, after cutting the existing pipe over the range of about 180 °, penetrates into the existing pipe from the cut groove, and closes the cutting groove and cuts the existing pipe. By pressing against the inner surface of the pipe,
A non-disruptive valve insertion method for inserting a valve having a valve body for closing the existing pipe into a pipe. 11. A gate valve body which penetrates into an existing pipe through an opening cut through a range of about 180 ° in a circumferential direction of the existing pipe to stop a flow of fluid in the existing pipe, wherein the opening of the existing pipe is An angle between a cutting surface at both ends in the circumferential direction of the groove and a surface of the existing pipe at the portion is set to an angle larger than 45 °, and a rubber packing is provided on the gate valve body. The rubber gasket is attached to the cutting surface in the groove by a first pressure.
A rubber packing portion and a second pressure-contacting inner peripheral surface of the existing pipe.
A gate valve body for non-separable flow insertion, wherein the gate valve body is formed so as to be continuous with a rubber packing portion. 12. The grooved opening according to claim 11, wherein the first rubber packing portion has both ends of the gate valve body formed in a substantially U-shape, and portions other than the both end portions have a substantially constant width. A gate valve body that is formed to match the hole. 13. An intrusion into the existing pipe through an opening formed in the existing pipe, the first rubber packing portion of the gate valve body comes into contact with a cutting surface forming the opening of the existing pipe, and A rubber valve seal is a gate valve body that comes into contact with the inner peripheral surface of the existing pipe to close the valve. The existing pipe is cut in a pipe radial direction with a cutting tool having a cutting blade along a tip surface and a cylindrical surface. Then, the cutting tool is moved along the circumferential direction of the pipe so that
A gate valve body, wherein the first rubber packing portion has a contact surface corresponding to a cutting surface of the groove-shaped opening formed over a range of 80 °. 14. An intrusion into the existing pipe from an opening formed in the existing pipe, the first rubber packing portion of the gate valve body comes into contact with a cutting surface forming the opening of the existing pipe, and A gate valve body in which a rubber packing portion comes into contact with an inner peripheral surface of the existing pipe to be in a valve-closed state, wherein the opening is formed in a groove shape narrower in a pipe axis direction than in a pipe radial direction. On the other hand, the first rubber packing portion has a shape along the cut surface of the groove-shaped opening. 15. An intrusion into the existing pipe from an opening formed in the existing pipe, the first rubber packing portion of the gate valve body comes into contact with a cutting surface forming the opening of the existing pipe, and A rubber packing portion that comes into contact with an inner peripheral surface of the existing pipe to be in a valve-closed state, wherein both ends of the first rubber packing portion in contact with the cutting surface in the pipe diameter direction are the second rubber packing; A gate valve body, wherein a stepped portion is formed with respect to a rubber packing portion, and the stepped portion has a surface intersecting a direction in which the gate valve enters. 16. An intrusion into the existing pipe from an opening formed in the existing pipe, the first rubber packing portion of the gate valve body comes into contact with a cutting surface forming the opening of the existing pipe, and A rubber packing portion that comes into contact with an inner peripheral surface of the existing pipe to be in a valve-closed state, wherein the first rubber packing portion has a portion excluding both ends in the pipe diameter direction crossing the existing pipe; A gate valve element comprising: a first contact surface formed along a surface; and a second contact surface connecting the first contact surface to the second rubber packing portion at the both ends. 17. An intrusion into the existing pipe from an opening formed in the existing pipe, the first rubber packing portion of the gate valve body comes into contact with the cutting surface forming the opening of the existing pipe, and A rubber packing portion that comes into contact with an inner peripheral surface of the existing pipe to be in a valve-closed state, wherein the first rubber packing portion has a portion excluding both ends in the pipe diameter direction crossing the existing pipe; A gate valve body comprising: a pair of first contact surfaces substantially parallel to each other along a surface; and a substantially U-shaped second contact surface connecting the two first contact surfaces at the both ends. . 18. An air conditioner comprising a rubber packing for sealing between an existing pipe and a gate valve body, wherein said rubber packing is provided in an orthogonal direction substantially orthogonal to a flow path of said existing pipe from an opening formed in said existing pipe. A gate valve body that enters the pipe and enters a valve-closed state; a first rubber packing portion having a surface along a cutting surface that forms an opening of the existing pipe; and a lower end of the gate valve body extending into the flow path. A rubber packing having a substantially semi-arc-shaped or U-shaped second rubber packing portion extending to substantially both ends of the inner peripheral surface of the existing pipe along a substantially orthogonal plane is provided on the gate valve body. In the closed state, the first rubber packing portion is pressed against the cut surface of the opening of the existing pipe, and the second rubber packing portion is mounted on the inner peripheral surface forming the flow path of the existing pipe. Pressure contact, the part except for both ends in the circumferential direction of the opening has a substantially constant width The gate valve body, wherein the first rubber packing portion has a shape along the cut surface of the opening. 19. A sealed case that is divided into a plurality of pieces in the circumferential direction of the existing pipe, surrounds a part of the existing pipe in an airtight state, and is rotatable around the existing pipe in the airtight state. And the housing is housed in the closed case.
A valve device for non-separable flow insertion comprising the gate valve body according to any one of claims 8 to 10.