JP4516666B2 - Continuous flow equipment and method - Google Patents

Description

[0001]
[Background of the invention]
Field of Invention:
The present invention relates to an apparatus and a method for constructing an existing pipe under a continuous flow.
[0002]
Conventional technology:
Conventionally, a continuous water valve insertion method for forming an opening in an existing pipe under constant water, inserting a gate from the opening, and blocking the flow of water in the pipe is well known (USP 3,948). , 282, USP 4,516,598, USP 5,611,365, 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 blocked by the gate valve body, and the work such as the intended pipe change is performed.
[0003]
In the method of USP 5,732,728, first, a gate passage hole for inserting a gate can be opened and closed by a sealing means, and a cutting tool is inserted from the gate passage hole to cut an existing pipe. After the cutting is completed, the gate is inserted after opening and closing the large sealing means and taking out the cutting tool.
In this conventional method, the cutting tool cannot be removed without opening and closing the large sealing means. Moreover, since the existing pipe is cut over the entire circumference, it is necessary to excavate deeply below the existing pipe.
[0004]
FIG. 20 shows 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. A drilling machine 505 having a cutting tool 504 is attached to the lower divided case 501. The upper divided case 502 is closed with 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 closing plate 503 is removed after the cutting is completed, a gate (not shown) is mounted on the upper divided case 502.
In this conventional construction method, the drilling machine 505 is attached to the lower split case 501, so that it is necessary to excavate the lower part of the existing pipe 1 deeply.
[0005]
FIG. 21 is a cross-sectional view showing a state where valve insertion is completed by the method disclosed in Japanese Patent 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 divided case 601 is provided with a hole 603 for inserting a cutting tool and an operation valve 604. The first split case 601 is provided with a gate passage hole 606 through which the gate 605 passes when opening and closing.
In this conventional construction method, first, the sealing case 600 is rotated approximately half a circumference, and the cutting groove 607 is cut into the existing pipe 1 only a half circumference by a cutting tool. Next, after removing the cutting tool, the operation valve 604 is closed.
This conventional method has revealed many problems in the above description.
Since it is necessary to rotate the large gate 605 and the sealed case 600, when the nominal diameter (caliber) of the existing pipe 1 is increased, a device for rotating the sealed case 600 around the existing pipe 1 becomes large.
Further, the gate 605 cannot be removed after completion of construction such as a target pipe change, or it takes time to remove. Therefore, it is not suitable when the buried depth of the existing pipe 1 is shallow.
Further, after removing the gate, rust is generated on the cutting surface of the cutting groove 607.
[0006]
SUMMARY OF THE INVENTION AND EFFECT OF THE INVENTION
In order to solve the above problem, the continuous flow cutting device of the present invention includes a sealed case and a drilling machine. The sealed case includes a plurality of divided cases divided in the circumferential direction of the existing pipe and surrounds a part of the existing pipe in an airtight state. The drilling machine rotates a milling cutting tool with a prime mover.
The sealed case has a structure suitable for rotating in the circumferential direction of the existing pipe.
A cutting tool insertion hole for inserting the milling cutting tool and a cutting tool insertion hole for inserting the milling-shaped cutting tool are inserted into the first divided case among the divided cases in order to stop the flow of fluid in the existing pipe after cutting. A gate passage hole through which the gate passes is formed.
The first divided 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 continuous flow cutting method of the present invention uses the continuous flow cutting device and includes the following assembly process, cutting process, feeding process and tool extraction process.
In the assembly step, the sealing case surrounds a part of the existing pipe in an airtight state, the first operation valve is closed so as to close a gate passage hole of the sealing case, And allowing the cutting tool to enter the cutting tool insertion hole with the second operation valve opened.
In the cutting step, the cutting tool is rotated and cut in the radial direction of the existing pipe while performing a cutting motion for cutting the existing pipe by the rotation of the cutting tool.
In the feeding step, the sealing case is rotated in the circumferential direction of the existing pipe while continuing the cutting motion. By this rotation, the cutting tool is rotated in the circumferential direction of the existing pipe, and the cutting tool is caused to perform a feeding motion. By this feed movement, the existing pipe is cut by the cutting tool over a range of approximately half a circumference in the circumferential direction without generating a section. As a result of this cutting, a cutting groove is formed that is cut open in the circumferential direction of the existing pipe over a substantially half-circumferential range.
In the tool removal step, the cutting tool is removed from the sealed case after the cutting is completed, and then the second operation valve is closed.
[0008]
On the other hand, the continuous flow valve insertion device of the present invention includes a sealed case and a gate.
The sealed case includes a plurality of divided cases divided in the circumferential direction of the existing pipe and surrounds a part of the existing pipe in an airtight state. The gate is inserted to stop the flow of fluid in the existing pipe after the existing pipe is cut.
A cutting tool insertion hole for inserting a milling cutting tool and a gate passage hole through which the gate passes are formed in the first divided case among the divided cases.
The insertion device includes a first operation valve that opens and closes the gate passage hole, and a storage case that stores the gate when the gate is opened.
The housing case and the sealing case are provided with a flange portion for joining the housing case housing the gate with the first operation valve closed to the sealing case.
[0009]
The continuous flow valve insertion method of the present invention includes the following assembly process, cutting process, feeding process, tool removal process, and gate mounting process using the continuous flow valve insertion device.
In the assembling step, the sealing case surrounds a part of the existing pipe in an airtight state, the first operation valve is closed so as to close a gate passage hole of the sealing case, and the cutting is performed. And allowing the cutting tool to enter the cutting tool insertion hole while a second operation valve for opening and closing the tool insertion hole is open.
In the cutting step, the cutting tool is rotated and cut in the radial direction of the existing pipe while performing a cutting motion for cutting the existing pipe by the rotation of the cutting tool.
In the feeding step, the sealing case is rotated in the circumferential direction of the existing pipe while continuing the cutting motion. By this rotation, the cutting tool rotates in the circumferential direction of the existing pipe, and causes 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 approximately half a circumference in the circumferential direction without generating a section. As a result of this cutting, a cutting groove is formed that is cut open in the circumferential direction of the existing pipe over a substantially half-circumferential range.
In the tool removal step, the cutting tool is removed from the sealed case after the cutting is completed, and then the second operation valve is closed.
In the gate attaching step, the housing case that houses the gate after the formation of the cutting groove is joined to the sealed case in a state where the first operation valve is closed.
[0010]
According to this apparatus and construction 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 divided case, so it is necessary to dig a large area below the existing pipe. There is no.
Further, since the first and second operation valves are provided, the cutting tool can be easily taken out.
Furthermore, since the sealing case is rotated around the existing pipe without a large gate during cutting, the sealing case can be rotated with a small force.
Further, after the existing pipeline is stopped by the inserted gate, the first operation valve is opened, and the gate is accommodated in the accommodation case. Thereafter, the first operation valve is closed again, and then the gate and the housing case are removed. As a result, there is no large projecting portion above the existing pipe, and it is possible to perform construction on the existing pipe having a shallow burial depth.
[0011]
In the present invention, the “existing pipe” means a pipe in which a liquid such as water or oil flows in the pipe, and is generally buried in the ground.
“Sealing” does not mean that it is completely sealed, but means that the water is tight 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 level of water stopping performance.
Moreover, “enclose in an airtight state” means to seal to an extent that does not hinder cutting work or the like. For example, a drainage hole may be provided in the sealed case, the drainage hole may be opened during cutting, and chips together with water may be discharged from the drainage hole.
[0012]
As the “cutting tool” used in the present construction method, it is preferable to use a milling tool having a plurality of cutting edges on the tip surface and the outer peripheral surface.
Further, when cutting an existing pipe having mortar lining on the inner surface of the pipe, a cutting tool provided with a number of chips made of cemented carbide (Hard metal) or a cutting tool using diamond particles as a cutting blade is used. Is preferred.
[0013]
In the present invention, “cutting” means that a part of a pipe wall is cut off by rotating a cutting blade. The “cutting motion” refers to rotating the cutting blade, while the “feeding motion” refers to the cutting tool at a position where new parts of the tube wall can be cut one after another by the cutting tool. Means to move.
[0014]
[Explanation of Examples]
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. 1 and 2, the valve insertion device 100 includes a sealed case 102 and a punching machine 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. A rubber packing 114 seals between the first divided case 122 and the second divided case 121 and between the sealed case 102 and the existing pipe 1 shown in FIG.
[0015]
The first split case 122 is formed with a first branch portion 221 and a second branch portion 222 that protrude in a branch shape outward in the pipe radial direction C of the existing pipe 1. The second branch portion 222 is formed obliquely with respect to the first branch portion 221 so as to branch from the first branch portion 221.
[0016]
The first branch 221 is formed with a gate passage hole 180 through which a gate 8A (FIG. 5) described later passes. A flange portion 221b is provided at the upper end of the first branched portion 221. A housing case 124 (FIG. 5) and a flange lid 155 (FIG. 13), which will be described later, are fixed to the flange portion 221b by an assembly bolt 162.
[0017]
As shown in FIGS. 1 and 2, the upper portion 221 a of the first branch portion 221 has a first operation valve 191 that opens and closes the gate passage hole 180 when the first operation valve (hereinafter referred to as a first valve) 191 is closed. A valve box that accommodates the valve 191 is integrally formed. The upper part 221a is provided with a path 192 through which the first valve 191 advances and retreats when opened and closed, and a guide 193 for guiding the first valve 191. A rubber ring 115 seals between the first valve 191 and the guide 193.
[0018]
The first valve 191 includes a valve rod 194 and a valve lid 195. The valve rod 194 opens and closes the first valve 191 in the pipe axis direction S of the existing pipe 1. The valve lid 195 accommodates the first valve 191 when the valve is opened. The valve lid 195 is fixed to the right side surface of the first branch portion 221 in the tube axis direction S by an assembly bolt 162. A gap between the valve lid 195 and the first branch 221 is sealed with a rubber packing 116.
[0019]
The second branch portion 222 is opened toward the center of the existing pipe 1, and a cutting tool insertion hole 181 for inserting a milling cutting tool 4 is formed therein. An attachment 34 of the drilling machine 103 is fixed to the second branch portion 222 via a valve assembly 196. The valve assembly 196 includes a valve box 197, a second operation valve (hereinafter referred to as a second valve) 198, and an operation lever 199. The second valve 198 opens and closes the cutting tool insertion hole 181 by operating the operation lever 199. A rubber ring (not shown) is sealed between the second branch portion 222 and the valve assembly 196 and between the valve assembly 196 and the attachment 34. The second branched portion 222 has a female screw portion 122a for screwing the plug 160 of FIG.
[0020]
Drilling machine 103
As shown in FIG. 3, in the punching machine 103, the cutter case 31 </ b> A is fixed to the valve assembly 196 (FIG. 1) via the attachment 34. 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 reduction gear 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.
[0021]
A cutting screw 37 is provided in the cutter case 31 </ b> A in parallel with the cutter shaft 32. The cutting screw 37 rotates forward and backward via bevel gears 39A and 39B by rotating a handle 38. A female screw formed on the gripping portion 36F is screwed into the cutting screw 37. The gripping portion 36F grips the cutter shaft 32 via the second bearing 36B. Therefore, by rotating the handle 38, the gripping portion 36F moves forward or backward and the cutter shaft 32 moves forward or backward as the cutting screw 37 rotates.
The drilling machine 103 may have the same structure as a well-known drilling machine except that the cutting tool 4 has an end mill shape.
[0022]
Next, the construction method will be described.
Assembly process
First, with the liquid (water) flowing in the existing pipe 1 in FIG. 1, the operator attaches the sealed case 102 to the cutting position of the existing pipe 1 and uses the assembly bolts (not shown) to form the first divided case 122. And the second divided case 121 are assembled. Thereafter, the operator 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. At this time, the operator closes the first valve 191 so as to close the gate passage hole 180 of the sealed case 102, and puts the cutting tool 4 in the cutting tool insertion hole 181 with the second valve 198 opened. Let me enter. Thus, the sealed case 102 surrounds a part of the existing pipe 1 in an airtight state.
[0023]
Cutting process
After the assembly process, when the operator operates the drilling machine 103 to drive the electric motor 35 (FIG. 3), the cutting tool 4 rotates together with the cutter shaft 32 and starts a cutting motion for cutting the existing pipe 1. To do. When the operator operates the drilling machine 103 and sends the cutting tool 4 in the cutting direction C1 while the cutting motion is being performed, the cutting tool 4 is eventually turned on as shown in FIG. The distal end surface 40 of the existing tube 1 advances to a position penetrating a part of the tube wall 1a. Thus, the cutting with the cutting tool 4 is completed.
[0024]
Feeding process
After the cutting step, the operator rotates the sealing case 102 in the circumferential direction R of the existing pipe 1 as shown in FIG. That is, the cutting tool 4 performs a feed motion that rotates in the circumferential direction R together with the sealing case 102 while rotating around the cutter shaft 32. In this way, the operator rotates the cutting tool 4 in the circumferential direction R of the existing pipe 1 over a range of approximately a half circumference in a state where the cutting tool 4 is performing a feeding motion. Thereafter, the operator retracts the cutting tool 4 to the original position and returns the sealed case 102 to the original position as shown in FIG. Thereafter, the operator fixes the sealed case 102 to the existing pipe 1 with a set screw 165 shown in FIG. In this way, the existing pipe 1 is cut in the circumferential direction R over a substantially half-circumferential range without generating a section, and the existing pipe 1 is cut substantially half a circumference in the circumferential direction R as shown in FIGS. A cutting groove 12 </ b> C that is cut open over the range is formed.
[0025]
Tool removal process
After the feeding step, the operator operates the operation lever 199 in FIG. 1 to close the second valve 198 and remove the punch 103. After this removal, the operator attaches a 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 insertion device to screw the plug 160 of FIG. 5 into the female screw portion 122a of the second branch portion 222. After this screwing, the operator removes the valve assembly 196 (FIG. 1) and the plug inserter, and attaches the closing lid 163 to the second branch portion 222.
[0026]
Gate assembly 123
Next, the structure of the gate assembly inserted into the pipe line will be described.
As shown in FIGS. 5 and 6, the gate assembly 123 includes a housing case 124 and a gate 8A. The accommodating case 124 accommodates the gate 8A when the gate 8A is opened. The housing case 124 is provided with a flange portion 124 a that is joined to the flange portion 221 b of the first branch portion 221. A space between the housing case 124 and the first branch portion 221 is sealed with a rubber packing 117. The gate 8A slides in the pipe radial direction C of the existing pipe 1 by rotating the spindle 8C in the forward and reverse directions. A rubber packing 8d is attached to the gate 8A. As shown in FIG. 7, when the gate 8A enters the existing pipe 1 from the cutting groove 12C, the rubber packing 8d closes the cutting groove 12C and presses against the inner surface of the existing pipe 1.
[0027]
Gate installation process
After the tool removal step, the operator moves the flange portion 124a of the housing case 124 housing the gate 8A to the first branch-shaped portion 221 with the first valve 191 closed as shown in FIGS. The assembly bolt 162 is fixed to the flange portion 221b. Thereafter, as shown in FIG. 8A, the operator opens the first valve 191. After this valve opening, as shown in FIG. 8 (b), the operator rotates the spindle 8C in the forward direction so that the gate 8A enters the existing pipe 1 from the cutting groove 12C, and the gate 8A Stop the flow of water in the existing pipe 1. In the closed state of the existing pipe 1, for example, work such as pipe change is performed.
[0028]
Gate removal process
After performing the operation such as the pipe change, the operator takes out the gate 8A from the cutting groove 12C and removes the gate assembly 123 in the reverse order of the gate attaching step.
[0029]
Next, when it is necessary to carry out the rust prevention process of the cutting groove 12C, the rust prevention tool assembly 107 is attached to the sealed case 102 as described below.
Rust prevention assembly 107
As shown in FIGS. 9 and 10, the rust preventive tool assembly 107 includes a rust preventive tool storage case 210, the rust preventive tool 7, and a push shaft 7 </ b> A that pushes the rust preventive tool 7 into the existing pipe 1. The rust preventive tool storage case 210 is provided with a flange portion 210 a that is joined to the flange portion 221 b of the first branch portion 221. The space between the rust preventive tool storage case 210 and the first branch portion 221 is sealed with a rubber packing 117.
[0030]
The rust preventive tool 7 has a shape corresponding to the cutting groove 12C. That is, the rust preventive tool 7 is formed in a semicircular 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 tool 7 includes a pressure contact portion 71 made of an elastomer and a core material portion (rigid body portion) 72. The pressure contact portion 71 is in pressure contact with the cut surface of the cutting groove 12C over substantially the entire circumference. The core part 72 has rigidity against water pressure acting on the cutting groove 12C, and the pressure contact part 71 is integrally baked. As shown in FIG. 13, the core member 72 is formed so that the width of the portion other than the portion entering the existing pipe 1 is slightly larger than the cutting groove 12 </ b> C. As shown in FIGS. 11A and 11B, screw contact portions 72 a are provided at both ends of the core material portion 72. The screw contact portions 72 a contact the fixing screws 161 that press the core material portion 72 toward the inside of the existing pipe 1. It has been. The pushing shaft 7A slides the rust preventive tool 7 in the tube axis direction C of the existing tube 1 by rotating in the forward direction. The pushing shaft 7A can be removed from the rust preventive tool 7 by rotating the rust preventive tool 7 into the existing pipe 1 and then rotating it in the reverse direction.
[0031]
Rust preventive installation process
After the gate removal step, the operator places the first flange portion 210a of the rust preventive tool housing case 210 housing the rust preventer 7 with the first valve 191 closed as shown in FIGS. The branch portion 221 is fixed to the flange portion 221b with the assembly bolt 162.
[0032]
Sealing process
After the rust preventive tool attaching step, the operator opens the first valve 191. After this valve opening, as shown in FIG. 12A, the operator rotates the push shaft 7A in the forward direction to slide the rust preventive tool 7 in the tube axis direction C and fit into the cutting groove 12C. . After this fitting, the operator screws the fixing screw 161 (FIG. 11).
[0033]
After the closing step, the operator removes the first valve 191, the valve rod 194, and the valve lid 195 from the sealed case 102 of FIG. 12A, and replaces the valve lid 195 with the flange shown in FIG. A lid 156 is attached. Thereafter, the operator removes the rust preventive tool storage case 210 and the push shaft 7A from the sealed case 102, and attaches the flange lid 155 of FIG. In this way, the piping structure shown in FIG. 13 is obtained.
[0034]
Second embodiment
14 to 19 show a second embodiment.
Valve insertion device (cutting device) 100
As shown in FIGS. 14 and 15, the valve insertion device 100 includes a sealed case 102 and a punching machine 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 first split case 122 is formed with a first branch portion 221 and a second branch portion 222 that protrude in a branch shape outward in the pipe diameter direction C of the existing pipe 1. The first branch portion 221 and the second branch portion 222 are provided apart (displaced) in the tube axis direction S of the existing pipe 1.
In addition, the other structure of the valve insertion apparatus 100 is the same as that of 1st Example, attaches | subjects the same code | symbol to the same part or an equivalent part, and abbreviate | omits the detailed description.
[0035]
Next, the construction method will be described.
Assembly process
First, with the liquid (water) flowing in the existing pipe 1 in FIG. 14, the operator attaches the sealing case 102 to the cutting position of the existing pipe 1 and uses the assembly bolts (not shown) to form the first divided case 122. And the second divided case 121 are assembled. Thereafter, the operator 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. At this time, the operator closes the first valve 191 so as to close the gate passage hole 180 of the sealed case 102, and puts the cutting tool 4 in the cutting tool insertion hole 181 with the second valve 198 opened. Let me enter. Thus, the sealed case 102 surrounds a part of the existing pipe 1 in an airtight state.
[0036]
Cutting process
After the assembling process, the operator, in the same manner as the cutting process of the first embodiment, removes the cutting tool 4 from the existing pipe 1 while the cutting tool 4 is performing a cutting motion for cutting the existing pipe 1. It is sent in the tube diameter direction C. Thereby, as shown with the broken line of FIG. 15, the cutting tool 4 advances to the position which penetrates a part of the pipe wall 1a of the existing pipe 1.
[0037]
Feeding process
After the incision step, the operator performs the feed movement in which the cutting tool 4 rotates in the circumferential direction R of the existing pipe 1 in the same manner as the feed step in the first embodiment. Is rotated in the circumferential direction R of the existing pipe 1 over a range of approximately a half circumference. As a result, a cut groove 12C (FIG. 16) is formed in the existing pipe 1 by cutting it in the circumferential direction R over a substantially half-circumferential range.
[0038]
Tool removal process
After the feeding step, the operator removes the drilling machine 103 and the valve assembly 196 in the same manner as the tool removal step in the first embodiment, and plugs 160 into the female screw portion 122a of the second branch portion 222. After screwing, as shown in FIG. 16, the closing lid 163 is attached to the second branch portion 222.
[0039]
Gate installation process
After the tool removal step, the operator moves the gate assembly 123 to the first state with the first valve 191 closed as shown in FIG. 17A in the same manner as the gate attachment step of the first embodiment. Attached to the branched portion 221.
[0040]
Movement process
After the gate mounting step, as shown in FIG. 17 (b), the operator moves the sealing case 102 in the tube axis direction S of the existing tube 1 so that the gate passage hole 180 corresponds to the position of the cutting groove 12C. Move to the position where you want to. Thereafter, the operator fixes the sealed case 102 to the existing pipe 1 with a set screw 165. Thereafter, the operator opens the first valve 191. After this valve opening, as shown in FIG. 18, the operator enters the gate 8A into the existing pipe 1 from the cutting groove 12C, and stops the flow of water in the existing pipe 1 by the gate 8A. In the closed state of the existing pipe 1, for example, work such as pipe change is performed.
[0041]
Gate removal process
After performing the operation such as the pipe change, the operator takes out the gate 8A from the cutting groove 12C and removes the gate assembly 123 in the reverse order of the gate attaching step.
[0042]
Next, when it is necessary to carry out the rust prevention process of the cutting groove 12C, the rust prevention tool assembly 107 is attached to the sealed case 102 as described below.
Rust preventive installation process
After the gate removal step, the operator moves the rust prevention device assembly 107 to the first branch portion 221 with the first valve 191 closed in the same manner as in the rust prevention device attachment step of the first embodiment. Install.
[0043]
Sealing process
After the rust preventive tool attaching step, the operator inserts the rust preventive tool 7 into the cutting groove 12C in the same manner as the rust preventive tool attaching step of the first embodiment.
[0044]
After the closing step, the operator removes the first valve 191, the valve stem 194, and the valve lid 195 from the sealed case 102 of FIG. 19 flange lids 156 are attached. Thereafter, the operator removes the rust preventive tool storage case 210 and the push shaft 7A from the sealed case 102, and attaches the flange lid 155 of FIG. In this way, the piping structure shown in FIG. 19 is obtained.
[0045]
In each of the embodiments, the first operation valve 191 is slid to open and close the gate passage hole 180. However, in the present invention, the first operation valve is rotated around the horizontal axis to open and close the gate passage hole. It may be.
Further, in the present invention, after the sealed case is rotated approximately half a circle, it is moved slightly in the tube axis direction, and further, the sealed case is rotated approximately half a circle to form a cutting groove having a width larger than the diameter of the cutting tool. Also good. Thereby, a gate having a large width can be inserted.
[0046]
As described above, the preferred embodiments have been described with reference to the drawings. However, those skilled in the art will readily understand various changes and modifications within the obvious scope by looking at the present specification.
For example, as a prime mover that applies a cutting motion to a cutting tool, an engine or the like may be used in addition to a motor.
The sealed 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 of the cutting groove, and the flange lid may be attached after the gate assembly is removed.
Accordingly, such changes and modifications are to be construed as within the scope of the present invention.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an assembly process 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 a drilling machine.
4 (a) is a schematic cross-sectional view showing a cutting process, and FIGS. 4 (b) and 4 (c) are schematic cross-sectional views showing a feeding process, 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 a process 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.
11A is a plan view showing a fixing screw, and FIG. 11B is a side view in which the same part is broken.
12 (a) and 12 (b) are schematic longitudinal sectional views showing a sealing step, respectively.
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 process of the construction method according to the second embodiment of the present invention.
FIG. 15 is a sectional view taken along line XX.
FIG. 16 is a longitudinal sectional view showing a tool removal step.
17 (a) and 17 (b) are schematic longitudinal sectional views showing a moving process, respectively.
FIG. 18 is a longitudinal 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 continuous water valve insertion method.
FIG. 21 is a sectional view showing another conventional continuous water valve insertion method.
[Explanation of symbols]
1: Existing pipe
100: Continuous water valve insertion device
102: Sealed case
103: Drilling machine
121: Second division case
122: First division case
124: Storage case
124a, 221b: Flange
12C: Cutting groove
180: Gate passage hole
181: Cutting tool insertion hole
191: First operation valve
192: Route
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 (1)

A sealed case comprising a plurality of divided cases divided in the circumferential direction of the existing pipe, and surrounding a part of the existing pipe in an airtight state;
A gate inserted to stop the flow of fluid in the existing pipe after cutting the existing pipe;
A cutting tool insertion hole for inserting a milling cutting tool formed in the first divided case of the divided cases;
A gate passage hole formed in the first divided case and through which the gate passes;
A first operation valve for opening and closing the gate passage hole;
A second operation valve for opening and closing the cutting tool insertion hole;
A storage case for storing the gate when the gate is opened;
An uninterrupted flow valve using an uninterrupted flow valve insertion device in which a flange portion for joining the accommodating case accommodating the gate with the first operation valve closed to the sealed case is provided in the accommodating case and the sealed case. An insertion method,
It has an assembly process, a cutting process, a feeding process, a tool removal process, and a gate mounting process.
In the assembly step, the sealing case surrounds a part of the existing pipe in an airtight state, the first operation valve is closed so as to close a gate passage hole of the sealing case, Allowing the cutting tool to enter the cutting tool insertion hole with a second operation valve that opens and closes the cutting tool insertion hole being opened,
In the cutting step, the cutting tool is rotated and the cutting tool is rotated to cut the existing pipe, and the cutting tool is cut in a radial direction of the existing pipe.
In the feeding step, while the cutting operation is continued in a state where the first operation valve is closed and the housing case is not joined to the sealing case, the sealing case is moved around the circumference of the existing pipe. Rotate in the direction
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 over a range of approximately a half circumference in the circumferential direction by the cutting tool without generating a section,
As a result of this cutting, a cutting groove is formed that is cut open in the circumferential direction of the existing pipe over a substantially half-circumferential range , and the gate enters the existing pipe and stops the water in the existing pipe .
In the tool removal step, after the cutting is completed, the cutting tool is taken out from the sealed case, and then the second operation valve is closed,
In the gate attaching step, an uninterrupted flow valve insertion method in which the housing case that houses the gate after the formation of the cutting groove is joined to the sealed case in a state where the first operation valve is closed.

Images