JP2001330189A - Non-cutoff flow device and construction method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a non-cutoff flow device and a construction method for the work execution of an existing pipe under non-cutoff water. SOLUTION: This non-cutoff flow cutting device 100 is provided with a closed case 102 and a drill 103. The drill 103 is constituted to rotate a milling type cutting tool 4 by a prime mover. The closed case 102 has structure suitable for the rotation of an existing pipe 1 in the circumferential direction R. A cutting tool insert hole 181 for inserting the cutting tool 4, and a gate passing hole 180 for the passage of a gate inserted to stop the flow of a fluid in the existing pipe 1 after cutting the existing pipe 1, are formed in a first divided case 122. The first divided case 122 is provided with a first operation valve 191 for opening/closing the gate passing hole 180, and a second operation valve 198 for opening/closing the cutting tool insert hole 181.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and a method for constructing an existing pipe under continuous flow.

2. Description of the Related Art Conventionally, a method of inserting a continuous water valve that forms an opening in an existing pipe under uninterrupted water, inserts a gate from the opening, and shuts off the flow of water in the pipeline is known. Well known (USP 3,948,282, USP 4,
516,598, USP5,611,365, USP
5,732,728, Japanese Patent Application Nos. 10-186865 and 11-86850). In such a construction method, after the valve is inserted, the flow of water is shut off by the gate valve body, and a work such as a desired pipe change is performed.

In the method of US Pat. No. 5,732,728, first, a gate through hole for inserting a gate is opened and closed by a sealing means, and a cutting tool is inserted from the gate through hole to cut an existing pipe. . After cutting is completed,
After opening and closing the large sealing means and taking out the cutting tool, the gate is inserted. In this conventional method, the cutting tool cannot be removed without opening and closing the large sealing means. Also,
Since the existing pipe is cut over the entire circumference, it is necessary to excavate deep below the existing pipe.

FIG. 20 is a cross-sectional view of an apparatus used in the method of Japanese Patent Application No. 10-186865. As shown in this figure, the sealed case 500 is divided into a lower divided case 501 and an upper divided case 502. The lower split case 50
1, a drilling machine 505 equipped with a cutting tool 504 is attached. The upper split case 502 is closed by a closing plate 503. In this conventional method, first, a cutting groove is formed on the entire circumference of the existing pipe 1 by the cutting tool 504. Next, after the cutting is completed, the closing plate 503 is removed, and a gate (not shown) is mounted on the upper split case 502. In this conventional method, since the drilling machine 505 is attached to the lower split case 501, it is necessary to excavate below the existing pipe 1 deeply.

FIG. 21 is a cross-sectional view showing a state in which valve insertion has been completed by the method disclosed in Japanese Patent Application Laid-Open No. 11-86850. As shown in this figure, the sealed case 600 is divided into a first divided case 601 and a second divided case 602. The first split case 601 is provided with a hole 603 for inserting a cutting tool and an operation valve 604. Further, the first split case 601 is provided with a gate passage hole 606 through which the gate 605 passes when opened and closed. In this conventional method, first, the closed case 600 is rotated substantially half a circumference, and the cutting groove 607 is cut into the existing pipe 1 by a half circumference using a cutting tool. Then, after removing the cutting tool,
The operation valve 604 is closed. In the conventional method, many problems have been clarified in the above description. Since it is necessary to rotate the large gate 605 and the sealed case 600, when the nominal diameter (diameter) of the existing pipe 1 increases, a device for rotating the sealed case 600 around the existing pipe 1 becomes large. Further, the gate 605 cannot be removed after the completion of the construction such as a change in the target piping, or it takes time to remove the gate 605. for that reason,
It is not suitable when the burying depth of the existing pipe 1 is shallow. Further, after the gate is removed, rust is generated on the cutting surface of the cutting groove 607.

[0006]

Summary of the Invention and Effects of the Invention In order to solve the above-mentioned problems, the present invention provides a continuous cutting machine having a sealed case and a punch. The closed case includes a plurality of divided cases divided in a circumferential direction of the existing pipe, and partially surrounds the existing pipe in an airtight state. The drilling machine rotates a milling cutting tool by a motor. The closed case has a structure suitable for rotating in the circumferential direction of the existing pipe. A cutting tool insertion hole for inserting the milling-shaped cutting tool and a cutting tool insertion hole for cutting off the flow of the fluid in the existing pipe after cutting the existing pipe are inserted into the first split case of the split case. A gate passage hole through which the gate passes is formed. The first split case is provided with a first operation valve for opening and closing the gate passage hole, and further, a second operation valve for opening and closing the cutting tool insertion hole.

[0007] The non-continuous cutting method of the present invention uses the above-mentioned non-continuous cutting device and includes the following assembling step, cutting step, feeding step and tool removing step. In the assembling step, surrounding a part of the existing pipe in an airtight state with the closed case, closing the first operation valve so as to close a gate passage hole of the closed case, The cutting tool is allowed to enter the cutting tool insertion hole with the second operation valve opened. In the cutting step, the cutting tool is rotated to perform a cutting motion for cutting the existing pipe by the rotation of the cutting tool, and the cutting is performed in a radial direction of the existing pipe.
In the feeding step, the closed case is rotated in the circumferential direction of the existing pipe while the cutting motion is continued. By this rotation, the cutting tool is rotated in the circumferential direction of the existing pipe to cause the cutting tool to perform a feeding motion. By this feed movement, the existing pipe is cut by the cutting tool over a range of substantially half a circumference in the circumferential direction without generating a section. As a result of this cutting, a cutting groove that is cut open over a range of approximately half a circumference in the circumferential direction of the existing pipe is formed.
In the tool removing step, the cutting tool is removed from the closed case after the completion of the cutting, and then the second operation valve is closed.

On the other hand, the device for inserting a non-disruptive valve according to the present invention includes a sealed case and a gate. The closed case includes a plurality of divided cases divided in a circumferential direction of the existing pipe, and partially surrounds the existing pipe in an airtight state. The gate is inserted after cutting the existing pipe to stop the flow of the fluid in the existing pipe. A cutting tool insertion hole for inserting a milling cutting tool and a gate passage hole through which the gate passes are formed in a first of the divided cases. In the present insertion device, a first operation valve that opens and closes the gate passage hole and a housing case that houses the gate when the gate is opened are provided. The housing case and the sealed case are provided with a flange portion for joining the housing case housing the gate with the first operation valve closed to the sealed case.

[0009] The method for inserting a non-disruptive valve according to the present invention comprises the following assembling step, cutting step,
It has a feeding process, a tool removal process, and a gate mounting process. The assembling step includes: enclosing a part of the existing pipe in an airtight state with the closed case; closing the first operation valve so as to close a gate passage hole of the closed case; The cutting tool is allowed to enter the cutting tool insertion hole with the second operation valve for opening and closing the tool insertion hole being opened. In the cutting step, the cutting tool is rotated to perform a cutting motion for cutting the existing pipe by the rotation of the cutting tool, and the cutting is performed in a radial direction of the existing pipe. In the feeding step, the closed case is rotated in the circumferential direction of the existing pipe while the cutting motion is continued. Due to this rotation, the cutting tool rotates in the circumferential direction of the existing pipe to cause the cutting tool to perform a feeding motion. By this feed movement, the existing pipe is cut by the cutting tool over a range of substantially half a circumference in the circumferential direction without generating a section. As a result of this cutting, a cutting groove that is cut open over a range of approximately half a circumference in the circumferential direction of the existing pipe is formed. In the tool removing step, the cutting tool is removed from the closed case after the completion of the cutting, and then the second operation valve is closed. In the gate mounting step,
After the formation of the cutting groove, the housing case housing the gate is joined to the closed case with the first operation valve closed.

According to the present apparatus and method, the desired cutting groove can be formed only by making a half turn around the existing pipe, and the cutting tool and the gate are attached to the first split case. No need to drill. Also,
Since the first and second operation valves are provided, it is easy to take out the cutting tool. Furthermore, during cutting, since the sealed case is rotated around the existing pipe without a large gate, the sealed case can be rotated with a small force. Further, after stopping the existing pipeline by the inserted gate, the first operation valve is opened, and the gate is stored in the storage case. Then, after closing the first operation valve again, the gate and the storage case are removed. As a result, there is no thing that protrudes significantly above the existing pipe,
Construction can be performed on existing pipes with a buried depth of shallow.

In the present invention, the term "existing pipe" means a pipe in which a liquid such as water or oil flows, and is generally buried underground. "Sealing"
It does not mean that it is completely closed, but that it is watertight enough to allow construction without interruption. Therefore, the “sealed case” refers to a case having a pressure resistance capable of withstanding the pressure of the liquid flowing in the existing pipe and a certain degree of water stopping performance. Further, “surrounding in an air-tight state” means that the sealing is performed so as not to hinder the cutting operation or the like. For example, a drain hole may be provided in the closed case, the drain hole may be opened during cutting, and chips may be discharged together with water from the drain hole.

As the "cutting tool" used in the present method, it is preferable to use a milling-shaped tool having a plurality of cutting blades on each of a front end surface and an outer peripheral surface. When cutting an existing pipe having a mortar lining on the inner surface of the pipe, a cutting tool provided with a number of tips made of a hard metal or a cutting tool using diamond particles as a cutting blade is used. Is preferred.

In the present invention, "cutting" refers to cutting a part of a pipe wall by rotating a cutting blade. Further, "cutting motion" refers to rotating the cutting blade, while "feeding motion" refers to a position where the cutting tool can cut new portions of the pipe wall one after another. Means to move.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. 1 to 13 show a first embodiment. Valve Insertion Device (Cutting Device) 100 As shown in FIGS.
Has a closed case 102 and a punch 103. The sealed case 102 includes first and second divided cases 122 and 121 divided into two in the circumferential direction R of the existing pipe 1 and has a structure suitable for rotating in the circumferential direction R of the existing pipe 1. Have. The space between the first divided case 122 and the second divided case 121 or the closed case 102 shown in FIG.
The space between the pipe 1 and the existing pipe 1 is sealed by a rubber packing 114.

The first divided case 122 includes the existing pipe 1
A first branched portion 221 and a second branched portion 222 that protrude outward in the pipe radial direction C are formed.
The second branched portion 222 is formed obliquely with respect to the first branched portion 221 so as to branch off from the first branched portion 221.

The first branch portion 221 has a gate passage hole 180 through which a gate 8A (FIG. 5) described later passes. A flange portion 221b is provided at an upper end of the first branch portion 221. The flange portion 221b
In this case, a housing case 124 (FIG. 5) and a flange lid 155 (FIG. 13) described later are fixed by assembly bolts 162.

As shown in FIGS. 1 and 2, the upper portion 221a of the first branch portion 221 is
When a first operation valve (hereinafter, referred to as a first valve) 191 that opens and closes a valve 0 is closed, a valve box that houses the first valve 191 is integrally formed. A path 192 through which the first valve 191 moves forward and backward when the first valve 191 opens and closes is provided in the upper portion 221a.
And a guide 193 for guiding the first valve 191. The space between the first valve 191 and the guide 193 is sealed by a rubber ring 115.

The first valve 191 includes a valve rod 194 and a valve cover 195. The valve stem 194 opens and closes the first valve 191 in the pipe axis direction S of the existing pipe 1.
The valve cover 195 accommodates the first valve 191 when the valve is opened. The valve cover 195 is fixed to the right side surface of the first branch portion 221 in the pipe axis direction S by an assembly bolt 162. The space between the valve lid 195 and the first branch portion 221 is sealed by a rubber packing 116.

The second branch portion 222 is open toward the center of the existing pipe 1 and has a cutting tool insertion hole 181 for inserting a milling cutting tool 4.
The second branch 222 includes a valve assembly 196.
The attachment 34 of the drilling machine 103 is fixed via the. The valve assembly 196 includes a valve box 197,
Second operation valve (hereinafter referred to as second valve)
198 and an operation lever 199. The second
The valve 198 opens and closes the cutting tool insertion hole 181 by operating the operation lever 199. The second branch 222
The space between the valve assembly 196 and the valve assembly 196 and the attachment 34 is sealed by a rubber ring (not shown). The second branch portion 2
22 has a female screw part 122a for screwing the plug 160 of FIG. 5 inside.

Drilling machine 103 As shown in FIG.
4, the cutter case 31A is connected to the valve assembly 19.
6 (FIG. 1). A long cutter shaft 32 is inserted into the cutter case 31A and the gear case 31B. The cutter shaft 32 is rotatably supported in the cutter case 31A and the gear case 31B via a first bearing 36A and a bearing (not shown). A female screw 32f for fixing the milling cutting tool 4 is formed at the tip of the cutter shaft 32, and the cutting tool 4 is fixed to the female screw 32f. The cutter shaft 32 is rotated by a reducer or a bevel gear (not shown) by the power of an electric motor (an example of a prime mover) 35. Therefore, the cutting tool 4 rotates around the cutter shaft 32 by the power of the electric motor 35.

A cutting screw 37 is provided in the cutter case 31A in parallel with the cutter shaft 32. By turning the handle 38, the cutting screw 37 rotates forward and backward through bevel gears 39A and 39B. A female screw formed on the holding portion 36F is screwed to the cutting screw 37. The grip portion 36F is connected to the second bearing 36.
The cutter shaft 32 is gripped via B. Therefore,
By rotating the handle 38, the cutting screw 3
As the 7 rotates, the grip 36F moves forward or backward, and the cutter shaft 32 moves forward or backward. In addition, this drilling machine 103 except that the cutting tool 4 is in an end mill shape,
The same structure as a well-known drilling machine can be used.

Next, the method of construction will be described. 1. Assembling Step First, in a state where the liquid (water) is flowing in the existing pipe 1 of FIG. 1, the worker attaches the sealed case 102 to a cutting position of the existing pipe 1 and performs the first division by an assembling bolt (not shown). The case 122 and the second divided case 121 are assembled. Thereafter, the worker attaches the first valve 191 to the first branch portion 221 and attaches the valve assembly 196 and the drilling machine 103 to the second branch portion 222. On this occasion,
The operator closes the first valve 191 so as to close the gate passage hole 180 of the sealed case 102, and moves the cutting tool 4 into the cutting tool insertion hole 181 with the second valve 198 opened. Keep it. Thus, the sealed case 10
2 surrounds a part of the existing pipe 1 in an airtight state.

[0023] After the cutting step the assembly process, the operator operates the drilling machine 103,
When the electric motor 35 (FIG. 3) is driven, the cutting tool 4 rotates together with the cutter shaft 32 and starts a cutting motion for cutting the existing pipe 1. While the cutting motion is being performed, the operator operates the drilling machine 103 to change the cutting tool 4 into the cutting direction C1.
Then, as shown in FIG. 4A, the cutting tool 4 advances to a position where the distal end surface 40 of the cutting tool 4 penetrates a part of the pipe wall 1a of the existing pipe 1. Thus, the cutting by the cutting tool 4 is completed.

Feeding Step After the cutting step, while the cutting tool 4 is performing the cutting motion, as shown in FIG. 4B, an operator places the sealed case 102 in the circumferential direction R of the existing pipe 1. Rotate to. That is, the cutting tool 4 performs a feeding motion of rotating in the circumferential direction R together with the sealed case 102 while rotating around the cutter shaft 32. As described above, the operator rotates the cutting tool 4 in the circumferential direction R of the existing pipe 1 over a range of substantially half a circumference while the cutting tool 4 is performing the feeding motion. After that, the operator retracts the cutting tool 4 to the original position, and moves the cutting tool 4 to the position shown in FIG.
The closed case 102 is returned to the original position as shown in FIG. Thereafter, the worker fixes the sealed case 102 to the existing pipe 1 with a set screw 165 shown in FIG. In this manner, the existing pipe 1 is cut in the circumferential direction R over a range of substantially half a circumference without generating a section, and as shown in FIGS. To form a cutting groove 12C that is cut open over the range.

Tool Removal Step After the above-mentioned feeding step, the operator operates the operation lever 199 shown in FIG.
Is operated to close the second valve 198, and the drilling machine 103 is removed. After this removal, the operator attaches a well-known plug inserter (not shown) to the valve assembly 196, and opens the second valve 198. After opening the valve, the operator operates the plug inserter to insert the plug 160 of FIG.
It is screwed into the female screw part 122a of the branch part 222. After this screwing, the operator moves the valve assembly 196 (FIG. 1).
Then, the plug inserter is removed, and the closing lid 163 is attached to the second branched portion 222.

Gate Assembly 123 Next, the structure of the gate assembly inserted into the pipeline will be described. As shown in FIGS. 5 and 6, the gate assembly 123 includes the housing case 124 and the gate 8A.
It has. The storage case 124 stores the gate 8A when the gate 8A is opened. The housing case 124 is provided with a flange portion 124a that is joined to the flange portion 221b of the first branch portion 221. The storage case 1
24 and the first branched portion 221, a rubber packing 117 is provided.
Sealed by. The gate 8A slides in the pipe diameter direction C of the existing pipe 1 by rotating the spindle 8C in the forward and reverse directions. A rubber packing 8d is mounted on the gate 8A. As shown in FIG. 7, when the gate 8A enters the existing pipe 1 through the cutting groove 12C, the rubber packing 8d closes the cutting groove 12C and presses against the inner surface of the existing pipe 1.

Gate mounting step After the tool removing step, the operator holds the gate 8A with the first valve 191 closed as shown in FIGS.
The flange 124a of the housing case 124 housing the first bolt 221 is attached to the flange 221b of the first branched portion 221.
Fix by 62. Thereafter, as shown in FIG. 8A, the operator opens the first valve 191. After this valve opening, as shown in FIG.
By rotating C in the forward direction, the gate 8A enters the existing pipe 1 from the cutting groove 12C, and the flow of water in the existing pipe 1 is stopped by the gate 8A. In the closed state of the existing pipe 1, work such as pipe change is performed.

Gate Removal Step After performing the work such as the pipe change, the operator removes the gate 8A from the cut groove 12C and removes the gate assembly 123 in a procedure reverse to that of the gate mounting step.

Next, when it is necessary to perform the rust prevention treatment on the cutting groove 12C, the rust prevention tool assembly 107 is attached to the closed case 102 as described below. Rust preventive assembly 107 As shown in FIGS.
Reference numeral 7 includes a rust preventive storage case 210, a rust preventive 7, and a push shaft 7 </ b> A for pushing the rust preventive 7 into the existing pipe 1. The rust preventive equipment housing case 210 is provided with a flange portion 210a joined to the flange portion 221b of the first branch portion 221. Corrosion-proof device housing case 210 and first branch portion 22
1 is sealed by a rubber packing 117.

The rust preventive 7 has a shape corresponding to the cut groove 12C. That is, the rust preventive 7 is formed in a semicircularly curved shape along the existing pipe 1, and does not stop the flow of water in the existing pipe 1 after being pushed into the existing pipe 1. It has a shape. The rust preventive 7
Includes a pressure contact portion 71 made of an elastomer and a core material portion (rigid body portion) 72. The press contact portion 71 is provided with the cutting groove 1
It is pressed against the cut surface of 2C over substantially the entire circumference. The core part 72 has rigidity against water pressure acting on the cutting groove 12C, and the press contact part 71 is integrally baked. FIG.
As shown in FIG. 3, the core member 72 is formed such that the width of the portion other than the portion that has entered the existing pipe 1 is slightly larger than the cutting groove 12C. At both ends of the core member 72, FIG.
As shown in (b), a screw contact portion 72 with which a fixing screw 161 pressing the core portion 72 toward the inside of the existing pipe 1 contacts.
a is provided. The push shaft 7A slides the rust preventive tool 7 in the pipe axis direction C of the existing pipe 1 by rotating in the forward direction. The push-in shaft 7A is connected to the existing pipe 1
Then, by rotating in the opposite direction, it can be removed from the rust preventive tool 7.

After the gate removing step, the worker is asked to attach the rust-prevention tool to the rust-proofing tool as shown in FIGS. 9 and 10.
When the first valve 191 is closed as shown in FIG.
0a is fixed to the flange portion 221b of the first branch portion 221 with the assembly bolt 162.

Closing Step After the rust prevention tool attaching step, the operator opens the first valve 191. After this valve opening, as shown in FIG. 12A, the operator rotates the pushing shaft 7A in the forward direction,
The rust preventive 7 is slid in the pipe axis direction C and fitted into the cutting groove 12C. After the fitting, the operator sets the fixing screw 161
(Fig. 11).

After the above-mentioned closing step, the worker moves to FIG.
The first valve 191, the valve stem 194, and the valve cover 195 are removed from the sealed case 102 of (a), and a flange cover 156 shown in FIG.
Thereafter, the worker removes the rust preventive device housing case 210 and the pushing shaft 7A from the sealed case 102, and attaches the flange cover 155 of FIG. Thus, the piping structure shown in FIG. 13 is obtained.

Second Embodiment FIGS. 14 to 19 show a second embodiment. Valve Insertion Device (Cutting Device) 100 As shown in FIG. 14 and FIG.
0 has a closed case 102 and a punch 103. The sealed case 102 is disposed in the circumferential direction R of the
It has the first and second divided cases 122 and 121 and has a structure suitable for rotating in the circumferential direction R of the existing pipe 1. The first split case 122 is formed with a first branch portion 221 and a second branch portion 222 that protrude outward in the pipe diameter direction C of the existing pipe 1 in a branch shape. The first branched portion 221 and the second branched portion 222 are provided apart from each other (displaced) in the pipe axis direction S of the existing pipe 1. The valve insertion device 100
Are the same as those of the first embodiment. The same or corresponding portions are denoted by the same reference characters, and detailed description thereof will be omitted.

Next, the method of construction will be described. Assembling Step First, in a state where the liquid (water) is flowing into the existing pipe 1 in FIG. 14, the worker attaches the closed case 102 to a cutting position of the existing pipe 1 and uses an assembling bolt (not shown).
The first divided case 122 and the second divided case 121 are assembled. After this, the worker places the first branch-shaped portion 221 in the first position.
The valve 191 is attached, and the valve assembly 196 and the drilling machine 103 are attached to the second branch 222. At this time, the operator operates the gate passage hole 180 of the closed case 102.
The first valve 191 is closed so as to close the
The cutting tool 4 is made to enter the cutting tool insertion hole 181 with the valve 198 opened. In this way, the closed case 102 surrounds a part of the existing pipe 1 in an airtight state.

[0036] After the cutting step the assembly process, the operator, as in the cutout step of said first embodiment, in a state where the cutting tool 4 is performing a cutting motion for cutting the existing pipe 1, the cutting The tool 4 is sent in the pipe diameter direction C of the existing pipe 1. Thereby, as shown by the broken line in FIG. 15, the cutting tool 4 advances to a position where it penetrates a part of the pipe wall 1a of the existing pipe 1.

Feeding step After the cutting step, the operator performs a feeding motion in which the cutting tool 4 rotates in the circumferential direction R of the existing pipe 1 in the same manner as in the feeding step of the first embodiment. Then, the cutting tool 4 is rotated in the circumferential direction R of the existing pipe 1 over a range of substantially half a circumference.
As a result, a cutting groove 12C (FIG. 16) which is cut open in the existing pipe 1 over a range of substantially a half circumference in the circumferential direction R is formed.

Tool Removal Step After the feeding step, the operator removes the drilling machine 103 and the valve assembly 196 and removes the plug 160 from the second branch 22 in the same manner as in the tool removal step of the first embodiment.
After being screwed into the second female screw portion 122a, the closing lid 163 is attached to the second branched portion 222 as shown in FIG.

Gate mounting step After the tool removing step, the operator, in the same manner as in the gate mounting step of the first embodiment, operates with the first valve 191 closed as shown in FIG. Gate assembly 1
23 is attached to the first branch portion 221.

Moving Step After the gate attaching step, as shown in FIG.
The operator moves the sealed case 102 in the pipe axis direction S of the existing pipe 1 to move the gate passage hole 180 to a position corresponding to the position of the cutting groove 12C. Thereafter, the worker fixes the sealed case 102 to the existing pipe 1 with the set screw 165. Thereafter, the operator opens the first valve 191. After this valve opening, as shown in FIG.
Is made to enter the existing pipe 1 through the cutting groove 12C, and the flow of water in the existing pipe 1 is stopped by the gate 8A. In the closed state of the existing pipe 1, work such as pipe change is performed.

Gate Removal Step After performing the work such as the pipe change, the operator removes the gate 8A from the cut groove 12C and removes the gate assembly 123 by the reverse procedure of the gate mounting step.

Next, when it is necessary to perform a rust prevention treatment on the cutting groove 12C, the rust prevention device assembly 107 is attached to the closed case 102 as described below. After rust tool mounting step the gate extraction step, the operator, in a manner similar to the anti-corrosion member mounting step of the first embodiment, in a state where the first valve 191 is closed, the Bosabigu assembly 107 first Branch 22
Attach to 1.

Closing Step After the rust preventive tool attaching step, the worker inserts the rust preventive tool 7 into the cutting groove 12C in the same manner as in the first embodiment.
Fit into

After the closing step, the operator moves the closed case 102 of FIG.
The valve 191, the valve stem 194, and the valve cover 195 are removed, and the flange cover 156 of FIG. Thereafter, the worker removes the rust preventive device housing case 210 and the pushing shaft 7A from the sealed case 102, and attaches the flange cover 155 of FIG. Thus, the piping structure shown in FIG. 19 is obtained.

In each of the above embodiments, the first operation valve 191 is slid to move the first passage through the gate passage hole 1.
Although 80 is opened and closed, in the present invention, the first operation valve may be rotated around a horizontal axis to open and close the gate passage hole. Further, in the present invention, after rotating the sealed case approximately half a circle, it is slightly moved in the pipe axis direction, and further, the sealed case is rotated substantially a half circle to form a cutting groove having a width larger than the diameter of the cutting tool. Is also good. Thereby, a gate having a large width can be inserted.

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. Further, the closed case may be divided into three or four in the circumferential direction. Further, the valve assembly, the drilling machine, and the first operation valve may be attached to the sealed case before surrounding the existing pipe with the sealed case. Also, the gate assembly need not necessarily be removed. Further, it is not always necessary to perform the rust prevention treatment on the cutting groove, and the flange lid may be attached after removing the gate assembly.
Accordingly, such changes and modifications are intended to be within the scope of the present invention.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an assembling step of a construction method according to a first embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of the same.

FIG. 3 is a partially cutaway side view showing the drilling machine.

FIG. 4 (a) is a schematic cross-sectional view showing a cutting step, and FIGS. 4 (b) and 4 (c) are schematic cross-sectional views showing a feeding step, respectively.

FIG. 5 is a cross-sectional view showing a gate attaching step.

FIG. 6 is a longitudinal sectional view of the same.

FIG. 7 is a perspective view showing a gate and a cutting groove.

FIGS. 8A and 8B are schematic longitudinal sectional views showing steps of inserting a gate, respectively.

FIG. 9 is a cross-sectional view showing a rust preventive tool attaching step.

FIG. 10 is a longitudinal sectional view of the same.

11 (a) is a plan view showing a fixing screw, FIG.
1 (b) is a side view in which the same portion is broken.

FIGS. 12 (a) and 12 (b) are schematic longitudinal sectional views each showing a sealing step.

FIG. 13 is a longitudinal sectional view showing a piping structure according to the first embodiment.

FIG. 14 is a longitudinal sectional view showing an assembling step of a method according to a second embodiment of the present invention.

FIG. 15 is a sectional view taken along line XX of FIG.

FIG. 16 is a longitudinal sectional view showing a tool removing step.

17 (a) and 17 (b) are schematic longitudinal sectional views showing a moving step.

FIG. 18 is a vertical sectional view showing a step of inserting a gate.

FIG. 19 is a longitudinal sectional view showing a piping structure according to a second embodiment.

FIG. 20 is a cross-sectional view showing a conventional method of inserting a non-stop water valve.

FIG. 21 is a cross-sectional view showing another conventional method of inserting a non-stop water valve.

[Explanation of symbols]

 1: Existing pipe 100: Continuous water valve insertion device 102: Sealed case 103: Drilling machine 121: Second divided case 122: First divided case 124: Storage case 124a, 221b: Flange part 12C: Cutting groove 180: Gate passage hole 181: Cutting tool insertion hole 191: First operation valve 192: Path 193: Guide 195: Valve lid 198: Second operation valve 4: Cutting tool 8A: Gate C: Radial direction R: Circumferential direction S: Pipe axis direction

Claims (9)

[Claims] 1. A closed case comprising a plurality of divided cases divided in a circumferential direction of an existing pipe and surrounding a part of the existing pipe in an airtight state, and a drilling machine having a milling cutting tool. An uncut flow cutting device, wherein the closed case has a structure suitable for rotating in a circumferential direction of the existing pipe, and the first divided case of the divided cases includes the milling-shaped cutting. A cutting tool insertion hole for inserting a tool,
A gate passage hole through which a gate inserted to stop the flow of fluid in the existing pipe after cutting the existing pipe is formed; a first operation valve for opening and closing the gate passage hole is provided; The second to open and close the tool insertion hole
An uninterrupted cutting device equipped with an operation valve. 2. The first divided case according to claim 1, wherein the first divided case is provided with a path through which the first operation valve moves forward and backward when the first operation valve is opened and closed, and a guide for guiding the first operation valve. An uncut flow cutting device, wherein a valve box of the first operation valve is integrally formed, and a valve cover of the first operation valve is joined to the first split case. 3. The continuous flow cutting device according to claim 1, wherein the cutting tool insertion hole and the gate passage hole are provided so as to be displaced in the pipe axis direction of the existing pipe. 4. An uncut flow cutting method using the uncut flow cutting device according to claim 1, comprising an assembling step, a cutting step, a feeding step, and a tool removing step, wherein the assembling step includes the step of using the closed case with the closed case. Enclosing a part of the existing pipe in an airtight state, closing the first operation valve so as to close a gate passage hole of the closed case, and setting the second operation valve in an open state. Causing the cutting tool to enter the cutting tool insertion hole, and in the cutting step, while rotating the cutting tool to perform a cutting motion for cutting the existing pipe by rotation of the cutting tool. In the feeding step, the closed case is rotated in the circumferential direction of the existing pipe while the cutting motion is continued. The tool is rotated in the circumferential direction of the existing pipe to cause the cutting tool to perform a feed motion, and the feed motion causes the existing pipe to be cut by the cutting tool over a range of approximately half a circumference in the circumferential direction without generating a section. Cutting, As a result of this cutting, a cutting groove that is cut open over a range of approximately half a circumference in the circumferential direction of the existing pipe is formed, and in the tool removing step, the cutting tool is removed from the sealed case after the completion of the cutting, and then And an uninterrupted cutting method for closing the second operation valve. 5. An airtight case comprising a plurality of divided cases divided in the circumferential direction of an existing pipe and surrounding a part of the existing pipe in an airtight state, and a flow of fluid in the existing pipe after cutting the existing pipe. A non-disruptive valve insertion device including a gate inserted for stopping, wherein a cutting tool insertion hole for inserting a milling-shaped cutting tool is provided in a first divided case of the divided cases, A first operation valve for opening and closing the gate passage hole, and a housing case for housing the gate when the gate is opened, wherein the first operation valve is closed An unbreakable valve insertion device, wherein a flange portion for joining the storage case housing the gate in the state to the closed case is provided in the storage case and the closed case. 6. The first divided case according to claim 5, wherein the first divided case is provided with a path through which the first operation valve moves forward and backward when the first operation valve is opened and closed, and a guide for guiding the first operation valve. The non-disruptive valve insertion device, wherein a valve box of the first operation valve is integrally formed, and a valve cover of the first operation valve is joined to the first split case. 7. The non-disruptive valve insertion device according to claim 5, wherein the cutting tool insertion hole and the gate passage hole are provided so as to be displaced in the pipe axis direction of the existing pipe. 8. A method for inserting an uncut flow valve using the device for inserting an uncut flow valve according to claim 5, comprising an assembling step, a cutting step, a feeding step, a tool removing step, and a gate attaching step. Sealing a part of the existing pipe in an airtight state with the sealed case, closing the first operation valve so as to close a gate passage hole of the sealed case, and removing the cutting tool insertion hole. Open and close second
Allowing the cutting tool to enter the cutting tool insertion hole with the operation valve open, and in the cutting step, rotating the cutting tool to rotate the existing pipe by rotation of the cutting tool. Cutting is performed in the radial direction of the existing pipe while performing a cutting motion for cutting.In the feeding step, the sealing case is rotated in the circumferential direction of the existing pipe while the cutting motion is continued. By the rotation, the cutting tool is rotated in the circumferential direction of the existing pipe to cause the cutting tool to perform a feeding motion, and by the feeding motion, the existing pipe is circumferentially moved by the cutting tool without generating a section. As a result of this cutting, a cutting groove is formed that is cut open in a circumferential direction of the existing pipe over a range of substantially half a circumference, and in the tool removing step, the cutting is performed. After that, the cutting tool is taken out of the closed case, and then the second operation valve is closed. In the gate mounting step, the storage case housing the gate after the formation of the cutting groove is removed by the first operation valve. Non-flowing valve insertion method of joining the closed case to the closed case in a closed state. 9. A method for inserting a non-disruptive valve using the non-disruptive valve insertion device according to claim 7, wherein the sealed case is moved in the pipe axis direction after the cutting groove is formed. The method further comprises a moving step of moving the gate passage hole to a position corresponding to the position of the cutting groove.