WO2019188778A1 - 不断流工法および装置 - Google Patents
不断流工法および装置 Download PDFInfo
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- WO2019188778A1 WO2019188778A1 PCT/JP2019/012071 JP2019012071W WO2019188778A1 WO 2019188778 A1 WO2019188778 A1 WO 2019188778A1 JP 2019012071 W JP2019012071 W JP 2019012071W WO 2019188778 A1 WO2019188778 A1 WO 2019188778A1
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- gate
- branch pipe
- groove
- valve body
- existing pipe
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L41/00—Branching pipes; Joining pipes to walls
- F16L41/04—Tapping pipe walls, i.e. making connections through the walls of pipes while they are carrying fluids; Fittings therefor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
Definitions
- the present invention relates to a continuous flow method and apparatus.
- the main body part of a T-shaped pipe having a main body part and a branch pipe part is mounted on an existing pipe, the gate for opening and closing the branch pipe part is opened and closed, and the existing part is installed with a hole saw.
- Methods for drilling tubes are well known.
- a plug insertion method a case is attached to the existing pipe, an end mill arranged in the case is rotated together with the case to form a cutting groove that is cut open over a half circumference, and a plug is inserted into the existing pipe from the cutting groove.
- the construction method is well known.
- the continuous water drilling method requires one gate as a working valve. If the diameter of the hole to be drilled is large, the gate has a large valve body and a larger valve box, which causes an excessive cost. In addition, a large space is required above the branch pipe portion.
- the plug insertion method requires a gate or a butterfly valve as a plug.
- These gates and valves and the joints attached to them are developed for each manufacturer's construction method and are significantly more expensive than standard products. This is an excessive cost factor.
- An object of the present invention is to reduce the cost of working valves and plugs in the two methods, and in particular, to reduce the cost related to the gate as a working valve in the continuous flow method.
- the present invention is a continuous flow method
- the main body portion 41 of the T-shaped tube 4 having the main body portion 41 and the branch pipe portion 42 is attached to the existing pipe 1, and the first gate G1 that opens and closes the branch pipe portion 42 is opened and closed.
- a case 5 is attached to the existing pipe 1, an end mill E disposed in the case 5 is rotated together with the case 5 to form a cutting groove 10 that is cut open over a half circumference, and a plug is inserted into the existing pipe 1 from the cutting groove 10.
- Plug insertion process to insert into, Prior to the drilling step, the step of preparing the T-shaped tube 4 having a semicircular groove 20 that is cut open in the circumferential direction R in the branch pipe portion 42; A connecting step of connecting the piping material 6 to the branch pipe portion 42 of the T-shaped tube 4 after the drilling step; After the connecting step, the step of removing the first gate G1 inserted into the half circumferential groove 20 from the branch pipe portion 42, In the plug insertion step, the first gate G1 or another first gate having the same shape and structure as the first gate G1 is inserted into the existing pipe 1 from the cutting groove 10 as the plug.
- the first gate for work used in the drilling step or another first gate that can be used in the drilling step is inserted into the existing pipe 1 as a plug. Therefore, the work gate and the plug gate in the drilling process can be made into one first gate. Accordingly, the cost for bypass piping is reduced.
- the tank for accommodating the first gate and the second gate for inserting and collecting the first gate can be shared, resulting in a significant cost. You can go down.
- the present invention is a continuous flow device for drilling having a first gate G1 in the branch pipe portion 42 of the T-shaped tube 4,
- the branch pipe portion 42 of the T-shaped tube 4 is formed with a semicircular groove 20 that is cut open over a half circumference in the circumferential direction R,
- the semicircular groove 20 includes a pair of semicircular portions 21 projecting downward at both ends, and a groove 22 having a constant width extending in the circumferential direction R and connecting the semicircular portions 21 to each other.
- the first gate G1 includes a valve body 11 having a circular portion inserted into the branch pipe portion 42 from the half circumferential groove 20 and a pair of valve body side portions 12 protruding toward the side of the valve body 11.
- the rubber packing 14 is A pair of string-like upper parts 15 attached to the upper half of the circular part and in contact with a pair of parallel first end surfaces defining the groove part 22; A string-like lower portion 16 attached to the lower half of the circular portion and in contact with the inner peripheral surface of the branch pipe portion 42; A pair of intermediate portions 17 respectively mounted on both sides of the valve body 11, Each of the intermediate portions 17 has the pair of upper portions 15 connected from above and the lower portion 16 connected from below.
- Each intermediate portion 17 has a semi-cylindrical portion 18 that fits into the circular portion, Each intermediate portion 17 has an upper surface F0 joined to the lower surface of the valve body side portion 12, a first side surface F1 joined to the side surface of the valve body 11, and a second side surface F2 joined to the guider 13. Have.
- a half-circular groove 20 that is cut open over a half circumference in the circumferential direction R is formed in the branch pipe portion 42 of the T-shaped tube 4.
- the semicircular groove 20 can have the same shape as the cutting groove 10 formed by cutting the existing pipe 1 with an end mill. Therefore, the first gate G1 as a work valve for drilling work can be used as a plug insertion gate.
- the first gate G1 may not be used as a plug insertion gate, but may be used as a work valve for drilling work.
- the intermediate portion 17 of the rubber seal 14 for sealing has a semi-cylindrical portion 18 that fits into the semicircular portion 21 of the semicircular groove 20.
- the semicircular portion 21 has a three-dimensionally complicated shape, while the semicylindrical portion 18 has a simple shape and is easy to design and manufacture. Therefore, the cost of the first gate G1 can be reduced.
- the intermediate portion 17 has a larger volume than the string-like upper portion 15 and lower portion 16, and therefore, the compression margin is large and the sealing function of the first gate G1 is enhanced.
- the present invention in a third aspect, is a continuous flow device for drilling, Having a T-shaped tube 4 having a main body portion 41 and a branch tube portion 42 and a first gate G1,
- the branch pipe portion 42 is formed with a half circumferential groove 20 that is cut open over a half circumference in the circumferential direction R.
- the first first gate G1 enters the branch pipe part 42 from the semicircular groove 20 and stops the flow of fluid in the branch pipe part 42;
- a first tube portion 44 extending right above the half-groove 20 and defining a first access passage 43 of the first gate G1 is coupled to the branch pipe portion 42;
- a second gate G2 is provided for moving forward and backward in parallel to the radial direction of the branch pipe portion 42 to open and close the first access passage 43;
- a sheath 2 is provided for accommodating the second gate G2 when the second gate G2 opens the access passage 43;
- the first tube portion 44 is provided with a first mounting flange 45 to which the sheath 2 including the second gate G2 is mounted,
- a first accommodating portion 46 of a small valve body V is provided in an inner portion of the first mounting flange 45 in the first cylindrical portion 44;
- An operation portion 31 is provided that allows the sheath 2 to be attached and detached by opening and closing the small valve body V in the first housing portion 46 from the outside of the first tube portion
- the continuous flow device for drilling may be used as a work valve even in the case of drilling work without plug insertion.
- the second gate G2 moves in parallel with the radial direction of the branch pipe portion 42. Therefore, the second gate G2 has a belt-like plate shape with a small width, and the small valve body V is smaller than the belt-like second gate G2. Open and close small openings corresponding to width and thickness. Therefore, the small valve body V remaining in the pipeline is extremely small, and the cost can be reduced.
- FIG. 1 is a schematic perspective view of a piping structure showing an embodiment of the method of the present invention.
- FIG. 2 is a schematic perspective view of an apparatus used in the drilling process.
- FIG. 3 is a schematic perspective view of a part of the apparatus used in the perforation process.
- 4 (a) and 4 (b) are cross-sectional views of the same device with the first gate opened.
- 5 (a) and 5 (b) are cross-sectional views of the same device with the first gate closed.
- FIG. 6A is a schematic perspective view showing a part of the T-shaped tube with the first gate closed
- FIG. 6B is a schematic perspective view of the rubber packing.
- 7A and 7B are an exploded perspective view of the first gate and a perspective view of the rubber packing, respectively.
- FIG. 8 is a partially perspective schematic perspective view showing a state in which the upper tank and the second gate are attached to the T-shaped tube.
- FIG. 9 is a partially perspective schematic perspective view showing a state in which a butterfly valve is further attached to the T-shaped tube.
- FIG. 10 is a schematic perspective view, partly in section, showing a state in which the upper tank and the first gate are removed from the T-shaped tube.
- FIG. 11A is a schematic perspective view of a partially sectioned T-shaped tube showing a state where the small valve body is closed
- FIG. 11B is a schematic perspective view of the small valve body and the like.
- FIG. 12 is a schematic perspective view of a part of the T-shaped tube showing a state where the second gate is removed from the T-shaped tube.
- FIG. 13 is a schematic perspective view of the T-shaped tube showing a state in which the second gate is removed from the T-shaped tube.
- FIG. 14 is a schematic perspective view showing a milling device for forming a cutting groove.
- FIG. 15 is a cross-sectional view showing the milling device during cutting.
- FIG. 16 is a schematic perspective view, partly in section, of a piping structure in which cutting grooves are being formed.
- FIG. 17 is a schematic perspective view showing a state in which the first and second gates are attached to the case in place of the cutter.
- 18A and 18B are a cross-sectional view and a cross-sectional view showing a joint portion of the case, respectively.
- FIG. 19 is a schematic perspective view showing a state in which the first gate has entered the existing pipe.
- FIG. 20 is a schematic perspective view showing a state in which the first gate is pulled out from the existing pipe.
- FIG. 21 is a schematic perspective view of a pipe line showing a completed state.
- the first gate G1 is inserted into the existing pipe 1 from the cutting groove 10 as the plug.
- the first gate G1 as an operation valve for continuous flow drilling is used as a plug for inserting a continuous flow plug. Therefore, two constructions, drilling and plug insertion, can be performed with one gate. Therefore, the construction cost is reduced.
- a butterfly valve as the piping material 6 is connected to the branch pipe portion 42, and the connection step is executed.
- the step of removing the first gate G1 from the branch pipe portion 42 is performed.
- a butterfly valve can be connected to the branch pipe portion 42 instead of the first gate G1, and the underground valve and valve chamber become compact. Moreover, the part which protrudes above the branch pipe part 42 becomes small.
- a step of connecting a bypass pipe to the butterfly valve After connecting the bypass pipe, a step of stopping the flow of the fluid in the existing pipe 1 at the first gate G1 is executed.
- the branch pipe part 42 has a first tube part 44 that extends right above the semicircular groove 20 and defines a first access passage 43 of the first gate G1. Further comprising the step of installing in the branch pipe part 42 a second gate G2 that opens and closes in the horizontal direction in parallel to the radial direction of the branch pipe part 42 and opens and closes the first access passage 43; A step of opening and closing the first access passage 43 by the second gate G2 and removing the first gate G1 from the branch pipe portion 42 is performed.
- the 1st gate G1 can be used many times as an operation valve.
- the case 5 has a second cylindrical portion 54 that extends directly above the cutting groove 10 and defines a second access passage 53 of the first gate G1.
- the continuous flow drilling and the continuous flow plug insertion can be performed by one first gate G1, and the first gate G1 can be used for the subsequent construction, thereby significantly reducing the cost and delivery time. be able to.
- this construction method is an uninterrupted flow method in which a perforation process and a plug insertion process are performed under an uninterrupted flow (indefinite water) and a bypass pipe is provided.
- the first gate G1 as the working gate used in the drilling step is inserted into the existing pipe 1 from the cutting groove 10 as a plug.
- the main body portion 41 of the T-shaped tube 4 having the main body portion 41 and the branch pipe portion 42 is attached to the existing pipe 1, and the branch pipe portion 42 is provided. Is a step of drilling the existing pipe 1 with a hole saw H under constant water using the first gate G1 that opens and closes.
- the case 5 is attached to the existing pipe 1, and the end mill E disposed in the case 5 is rotated along the outer periphery of the existing pipe 1 together with the case 5, thereby This is a step of forming a cutting groove 10 that is opened over and inserting a plug into the existing pipe 1 from the cutting groove 10.
- the uninterrupted flow device includes a T-shaped tube 4 having a main body portion 41 and a branch tube portion 42, and a first gate G1.
- the branch pipe portion 42 is a steel pipe having the same inner diameter and outer diameter as the existing pipe 1.
- a half-groove 20 that is cut open over a half circumference in the circumferential direction R is formed in the branch pipe portion 42 in advance.
- the first gate G1 enters the branch pipe portion 42 from the semicircular groove 20 and stops the flow of fluid in the branch pipe portion 42.
- a first tube portion 44 that extends directly above the semicircular groove 20 and defines a first access passage 43 of the first gate G1 is coupled to the branch pipe portion 42.
- the apparatus is provided with a second gate G2, a sheath 2 and a first mounting flange 45.
- the second gate G2 moves forward and backward in the horizontal direction in parallel with the radial direction of the branch pipe portion 42 to open and close the first access passage 43.
- the sheath 2 accommodates the second gate G2.
- the first cylindrical portion 44 is provided with a mounting flange 45 to which the sheath 2 including the second gate G2 is mounted.
- a first accommodating portion 46 of the small valve body V is provided in a portion inside the mounting flange 45 in the first cylindrical portion 44.
- the branch pipe portion 42 of the T-shaped tube 4 is formed with a half circumferential groove 20 that is cut open over a half circumference in the circumferential direction R.
- the semicircular groove 20 in FIG. 4 includes a pair of semicircular portions 21 protruding downward at both ends, and a groove portion 22 extending in the circumferential direction R and connecting the semicircular portions 21 to each other.
- the first gate G1 shown in FIGS. 6 and 7 protrudes toward the side of the valve body 11 and the valve body 11 having a circular portion 11c inserted into the branch pipe portion 42 from the half circumferential groove 20.
- the rubber packing 14 includes a pair of upper parts 15, a lower part 16 and a pair of intermediate parts 17. In some drawings, the rubber packing 14 is shown in gray.
- the lower portion 16 in FIG. 7 is attached to the edge 16e of the lower half portion of the circular portion 11c of the valve body 11, and has a string shape in contact with the inner peripheral surface of the branch pipe portion 42 in FIG.
- Each intermediate portion 17 in FIG. 7 is mounted on both sides of the valve body 11.
- Each of the intermediate portions 17 in FIG. 7B has the pair of upper portions 15 connected from above and the lower portions 16 connected from below.
- Each intermediate portion 17 in FIG. 6 has a semi-cylindrical portion 18 that fits into the semicircular groove 20 and the semicircular portion 21.
- Each intermediate portion 17 in FIG. 7 is joined to the upper surface F0 (FIG. 6) joined to the lower surface of the valve body side portion 12, the first side face F1 joined to the side surface of the valve body 11, and the guider 13. And a second side surface F2.
- the T-shaped tube 4, the first gate G1, the second gate G2, the upper tank 7 and the like shown in FIGS. 2 to 5 are prepared in advance.
- the existing pipe 1 is a steel pipe.
- the proximal end of the branch pipe portion 42 is integrally connected to the main body portion 41.
- the T-shaped pipe 4 including the main body 41 is preferably made of steel that can be welded to the existing pipe 1 in the field.
- the main body 41 may be a curved plate having a cylindrical surface, or may be a cylindrical tube having a slightly larger diameter than the existing tube 1 divided into two.
- the half-circular groove 20 that is cut open over the half circumference in the circumferential direction R is formed.
- a circular flange 42f for mounting a well-known drilling machine (not shown) is provided.
- Each flange such as the circular flange 42f is formed with a large number of through holes (not shown) for inserting bolts.
- the upper tank 7 is mounted on the upper surface of the first cylindrical portion 44 integral with the branch pipe portion 42 of FIG. 2 via a square flange 44f.
- the upper tank 7 in FIG. 2 is for accommodating the opened first gate G 1, and the inside of the upper tank 7 in FIG. 3 is connected to the first access passage 43.
- a butterfly valve, a first lid plate 47, and the like are prepared in advance as the piping material 6 to be mounted after drilling in FIG.
- the butterfly valve as the piping material 6 stops fluid from flowing out from the branch pipe portion 42 instead of the first gate G1 (FIG. 8).
- a commercially available product can be used, and for example, a flangeless butterfly valve may be used.
- the butterfly valve is sandwiched between a circular flange 42f of the branch pipe portion 42 and a flange short pipe (not shown) and connected to the branch pipe portion 42.
- the main body 41 of the T-shaped tube 4 is attached to the existing tube 1 by welding.
- the main body 41 may be configured by connecting a plurality of divided cases to each other so as to surround the existing pipe 1.
- the upper tank 7 that houses the first gate G ⁇ b> 1 of FIG. 2 is assembled to the rectangular flange 44 f of the cylindrical portion 44.
- the sheath 2 that houses the second gate G ⁇ b> 2 is assembled to the first mounting flange 45 of the first cylindrical portion 44.
- the punching machine having the hole saw H of FIG. 3 is mounted on the circular flange 42 f of the branch pipe portion 42.
- a branch hole H0 indicated by a broken line is drilled in the existing pipe 1.
- the first gate G1 descends downward through the first access passage 43, and the first gate G1 extends from the semicircular groove 20 as shown in FIGS. 42, the first gate G1 is closed. In this closed state, the first gate G1 prevents the fluid from flowing out of the branch pipe portion 42.
- the upper portion 15 of the rubber packing 14 of the valve body 11 is in contact with the end face 22f (FIG. 4) of the groove portion 22 of the half circumferential groove 20. Further, the intermediate portion 17 of the valve body 11 is in contact with the end face 21 f (FIG. 4) of the semicircular portion 21 of the semicircular groove 20. Further, the lower portion 16 of the valve body 11 is in contact with the inner peripheral surface of the branch pipe portion 42.
- a connecting step of connecting a butterfly valve as the piping material 6 to the branch pipe portion 42 of the T-shaped tube 4 in FIG. 9 is executed.
- the butterfly valve is connected in a closed state.
- the first gate G1 inserted into the half circumferential groove 20 is lifted from the branch pipe portion 42 to the upper tank 7 in the state where the butterfly valve is closed. G1 is accommodated in the upper tank 7.
- the first access passage 43 is opened and closed by the second gate G2, and the first gate G1 is removed from the first tube portion 44 of the branch pipe portion.
- FIG. 9B the small valve body V of FIG. 2 is rotated as shown in FIG. 9B to open the access opening 33, and the second gate G2 is branched from the access opening 33.
- the access passage 43 of the first gate G1 is closed by advancing in the horizontal direction in parallel with the radial direction of the pipe portion.
- the first gate G1 is removed from the first cylinder portion 44 together with the upper tank 7.
- the first cover plate 47 is attached to the rectangular flange 44f of the first tube portion 44 in FIG. 10 to close the first access passage 43 of the first tube portion 44.
- the second gate G2 is retracted and accommodated in the sheath 2 as shown in FIG.
- the operation portion 31 (FIG. 2) of FIG. 2 is rotated to close the access opening 33 as shown in FIG. 11 (b). With the access opening 33 closed, the second gate G2 is removed from the first mounting flange 45 together with the sheath 2.
- the second cover plate 48 is fastened to the first mounting flange 45 on the first mounting flange 45. Thereby, the access opening 33 is completely closed.
- bypass piping required for a butterfly valve the flow of the fluid of the existing pipe 1 mentioned later is stopped as well-known.
- the milling device M in FIG. 14 includes a sealed case 5 and a cutter 8.
- the sealed case 5 and the cutter 8 form a cutting groove 10 indicated by a broken line in the existing pipe 1. First, the sealed case 5 will be described.
- the first and second divided cases 51 and 52 that are divided into two parts in the upper and lower parts are welded to each other at the site.
- the sealed case 5 surrounds a part of the existing pipe 1.
- the first and second divided cases 51 and 52 may be made of cast iron, or may be fastened to each other by an assembly bolt. As is well known, the space between the sealed case 5 and the existing pipe 1 is sealed with rubber packing.
- the first split case 51 includes a second cylindrical portion 54 having the same shape and structure as the cylindrical portion 44 of the T-shaped tube 4 (FIG. 1).
- the second cylindrical portion 54 of FIG. 20 extends right above the cutting groove 10 and defines a second access passage 53 of the first gate G1 as shown in FIG.
- a second mounting flange 55 on which the sheath 2 including the second gate G2 is mounted is provided on the second cylindrical portion 54 of FIG.
- a second accommodating portion 56 of the second small valve body V2 is provided in a portion inside the second mounting flange 55 in the second cylindrical portion 54 of FIG.
- a part of the existing pipe 1 is surrounded by the case 5 in an airtight state. That is, the 1st division
- the cutter 8 is attached to the first divided case 51 via a square flange 54f.
- the fourth cover plate 58 is fastened to the second mounting flange 55.
- the cutting groove 10 cut in this way has the same shape and size as the half circumferential groove 20 of FIG.
- the existing pipe 1 is formed with a cutting groove 10 that is cut open over a half circumference in the circumferential direction R.
- the cutting groove 10 in FIG. 18 includes a pair of semicircular portions 21 projecting downward at both ends, and a groove portion 22 having a constant width extending in the circumferential direction R and connecting the semicircular portions 21.
- the first gate G1 enters the cutting groove 10 of FIG. 18, and the first gate G1 can stop the flow of fluid in the existing pipe 1.
- the cutting range ⁇ of the cutting groove 10 in FIG. 15 is about 180 °, but the rotation angle ⁇ of the case 5 is slightly smaller than 180 °.
- the second gate G2 of FIG. 18 is retracted from the second access passage 53, and the second access passage 53 is opened. Thereafter, as shown in FIG. 19, the first gate G1 descends through the second access passage 53, the first gate G1 enters the existing pipe 1 from the cutting groove 10, and the first gate G1 is closed. It becomes a state.
- valve body 11 is in contact with the end surface 22f of the groove portion 22 of the semicircular groove 20. Further, the intermediate portion 17 of the valve body 11 is in contact with the end face 21 f of the semicircular portion 21 of the cutting groove 10. Further, the lower portion 16 of the valve body 11 is in contact with the inner peripheral surface of the existing pipe 1.
- the water stop of the existing pipe 1 of FIG. 19 and the water stop of the T-shaped pipe 4 of FIG. 8 can be performed by the same one first gate G1. That is, both the perforating process for the uninterrupted flow branching in FIG. 8 and the plug inserting process in FIG. 19 can be performed using one first gate G1.
- the first gate G1 When the first gate G1 is left in the existing pipe 1, for example, when the first gate G1 is provided as a product, a first gate different from the first gate G1 is manufactured in advance.
- the gate can also be used as a plug.
- the second gate G2 If the first gate G1 is unnecessary after the plug insertion process, after performing necessary pipe work such as cutting off the existing pipe 1, as shown in FIGS. 19 and 20, the second gate G2 Thus, the second access passage 53 is opened and closed, the first gate G1 is pulled up from the cutting groove 10 of the existing pipe 1 to the upper tank 7 above, and the first gate G1 is removed.
- the removal method after the lifting is the same as that after the drilling step, and the description thereof is omitted.
- the third cover plate 57 may be attached to the square flange 54f, and the fourth cover plate 58 may be attached to the second mounting flange 55.
- the first gate may be an external screw type gate.
- the fluid may be oil or gas.
- the first gate inserted as a plug can be left as a valve.
- the uninterrupted flow method and apparatus of the present invention can be used to insert a gate valve body into a line of an existing pipe such as water or gas and stop the flow of fluid by the inserted gate valve body.
- the continuous flow method of the present invention can be employed when a branch pipe is provided after continuous water drilling.
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Abstract
Description
一方、プラグ挿入工法として、前記既設管にケースを装着し、前記ケース内に配置したエンドミルを前記ケースと共に回転し半周にわたって切り開いた切削溝を形成し、前記切削溝からプラグを前記既設管内に挿入する工法は周知である。
バイパス配管を設けるために、本体部41および分岐管部42を有するT字管4の前記本体部41を既設管1に装着し、前記分岐管部42を開閉する第1ゲートG1を開閉してホールソーHで前記既設管1を穿孔する穿孔工程と、
前記既設管1にケース5を装着し、前記ケース5内に配置したエンドミルEを前記ケース5と共に回転し半周にわたって切り開いた切削溝10を形成し、前記切削溝10からプラグを前記既設管1内に挿入するプラグ挿入工程と、
前記穿孔工程に先立って、前記分岐管部42に円周方向Rの半周にわたって切り開かれた半周溝20を有する前記T字管4を用意する工程と、
前記穿孔工程の後に、前記T字管4の前記分岐管部42に配管材6を接続する接続工程と、
前記接続工程の後に、前記半周溝20に挿入した前記第1ゲートG1を前記分岐管部42から抜く工程とを備え、
前記プラグ挿入工程において、前記第1ゲートG1又は前記第1ゲートG1と同一形状および構造を有する別の第1ゲートを前記プラグとして前記切削溝10から前記既設管1内に挿入する。
前記T字管4の前記分岐管部42には円周方向Rの半周にわたって切り開かれた半周溝20が形成され、
前記半周溝20は両端において下方に向って凸の一対の半円形状部21と、前記円周方向Rに延び前記半円形状部21同士を連ねる一定幅の溝部22とを備え、
前記第1ゲートG1は、前記半周溝20から前記分岐管部42内に挿入される円形状部を有する弁体11と、前記弁体11の側方に向かって突出する一対の弁体側部12と、前記弁体側部12から下方に向って延びる一対のガイダ13と、シール用のゴムパッキン14とを備え、
前記ゴムパッキン14は、
前記円形状部の上半部に装着され、前記溝部22を定義する一対の平行な第1端面に接するひも状の一対の上部15と、
前記円形状部の下半部に装着され、前記分岐管部42の内周面に接するひも状の下部16と、
前記弁体11の両サイドに各々装着される一対の中間部17とを備え、
前記各中間部17には各々前記一対の上部15が上方から連なり前記下部16が下方から連なり、
前記各中間部17は前記円形状部に嵌る半円柱状部18を有し、
前記各中間部17は前記弁体側部12の下面に接合される上面F0と、前記弁体11の側面に接合される第1側面F1と、前記ガイダ13に接合される第2側面F2とを有する。
なお、第1ゲートG1はプラグ挿入用のゲートとして用いずに、穿孔工事のための作業弁として用いられてもよい。
本体部41および分岐管部42を有するT字管4と第1ゲートG1とを有し、
前記分岐管部42には円周方向Rの半周にわたって切り開かれた半周溝20が形成され、
前記第1第1ゲートG1は前記半周溝20から前記分岐管部42内に侵入して前記分岐管部42内の流体の流れを止め、
前記半周溝20の真上に向って延び前記第1ゲートG1の第1アクセス通路43を定義する第1筒部44が前記分岐管部42に結合され、
前記分岐管部42の径方向に平行に進退移動して、前記第1アクセス通路43を開閉する第2ゲートG2が設けられ、
前記第2ゲートG2が前記アクセス通路43を開いている際に前記第2ゲートG2を収容する鞘2が設けられ、
前記第1筒部44には前記第2ゲートG2を含む前記鞘2が装着される第1装着フランジ45が設けられ、
前記第1筒部44における前記第1装着フランジ45の内側の部分に小弁体Vの第1収容部46が設けられ、
前記第1収容部46内の前記小弁体Vを前記第1筒部44の外から開閉操作することで前記鞘2の着脱を可能とする操作部31が設けられている。
なお、本穿孔用の不断流装置はプラグ挿入を伴わない穿孔工事のみの場合にも作業弁として用いられてもよい。
前記バタフライ弁が閉弁された状態で、前記第1ゲートG1を前記分岐管部42から抜く工程が実行される。
前記バイパス配管の接続後に、前記第1ゲートG1で前記既設管1内の流体の流れを止める工程を実行する。
前記分岐管部42の径方向に平行に、かつ、水平方向に進退移動して、前記第1アクセス通路43を開閉する第2ゲートG2を前記分岐管部42に設置する工程を更に備え、
前記第2ゲートG2により前記第1アクセス通路43を開閉して前記第1ゲートG1を前記分岐管部42から抜く工程を実行する。
前記第2ゲートG2を前記第1筒部44から取り外す工程と、
前記ケース5の径方向に平行に、かつ、水平方向に進退して、前記第2アクセス通路53を開閉する前記第2ゲートG2を前記第2筒部54に設置する工程と、
前記第2ゲートG2により前記第2アクセス通路53を開閉して、前記既設管1に挿入した前記第1ゲートG1を前記既設管1から抜く工程とを更に備える。
本例は既設管1がスチールパイプである場合について説明する。
なお、一部の図面において、ゴムパッキン14の部位はグレーで示している。
なお、本例では既設管1はスチールパイプである。
また、周知のように、密閉ケース5と既設管1との間はゴムパッキンによりシールされている。
前記第2収容部56内の前記第2小弁体V2を前記第2筒部54の外から開閉操作することで、流体の流出を防ぎ、前記鞘2の着脱を不断水下で可能とする第2操作部(図示せず)が設けられている。第2操作部の構造および形状は第1操作部と同様であり、その説明を省略する。
まず、図14に示すように、既設管1の一部を前記ケース5によって気密状態で囲繞する。すなわち、第1分割ケース51と第2分割ケース52とを互いに溶接し、既設管1を上下に挟むように囲繞する。方形フランジ54fを介して前記カッター8を第1分割ケース51に取り付ける。
なお、第2装着フランジ55には第4蓋板58を締結する。
その後、図15の実線および二点鎖線で示すように、カッター8のエンドミルEを既設管1の中心Oに向かって移動させてカッター8のエンドミルEで既設管1の管壁の一部を切削し、カッター8のエンドミルEを回転させながら、図15のミリング装置M全体を既設管1の周方向Rに回転させることで、図15に示すように既設管1の一部を穿孔して半周にわたる切削溝10を形成する。
その後、図15のエンドミルEを退避させ、図17のように、第2ゲートG2を内蔵した鞘2を第2筒部54の第2装着フランジ55に装着し、更に、図18の前記第2ゲートG2で前記第2アクセス通路53を閉塞した後、図14のカッター8およびエンドミルEを方形フランジ54fから取り外す。この取り外し後、図17の前記第1ゲートG1を内蔵した上部タンク7を前記方形フランジ54fに取り付ける。
なお、方形フランジ54fには第3蓋板57が取り付けられ、第2装着フランジ55には第4蓋板58が取り付けられてもよい。
たとえば、第1ゲートは外ネジ式のゲートであってもよい。流体はオイルやガスであってもよい。また、プラグ挿入として挿入された第1ゲートを弁として残すこともできる。また、バタフライ弁を設けることなく、プラグ挿入前にバイパス配管を完成させてもよい。
したがって、以上のような変更および修正は、請求の範囲から定まる本発明の範囲内のものと解釈される。
また、本発明の不断流工法は、不断水穿孔後に分岐配管を設ける場合に採用することができる。
11:弁体 11c:円形状部 12:弁体側部 13:ガイダ 14:ゴムパッキン
15:上部 15e:縁 16:下部 16e:縁 17:中間部 18:半円柱状部
2:鞘
20:半周溝 21:半円形状部 21f:端面 22:溝部 22f:端面
31:操作部 32:第2操作部 33:アクセス開口
4:T字管 41:本体部 42:分岐管部 42f:円形フランジ
43:第1アクセス通路 44:第1筒部 44f:方形フランジ
45:第1装着フランジ 46:第1収容部 47:第1蓋板 48:第2蓋板
5:ケース 51:第1分割ケース 52:第2分割ケース 53:第2アクセス通路
54:第2筒部 54f:方形フランジ 55:第2装着フランジ 56:第2収容部
57:第3蓋板 58:第4蓋板
6:配管材 7:上部タンク 8:カッター E:エンドミル
F0:上面 F1:第1側面 F3:第2側面
G1:第1ゲート G2:第2ゲート V:小弁体 V2:第2小弁体
H:ホールソー H0:分岐孔
M:ミリング装置 O:中心 R:円周方向
Claims (8)
- 不断流工法であって、
バイパス配管を設けるために、本体部41および分岐管部42を有するT字管4の前記本体部41を既設管1に装着し、前記分岐管部42を開閉する第1ゲートG1を開閉してホールソーHで前記既設管1を穿孔する穿孔工程と、
前記既設管1にケース5を装着し、前記ケース5内に配置したエンドミルEを前記ケース5と共に回転し半周にわたって切り開いた切削溝10を形成し、前記切削溝10からプラグを前記既設管1内に挿入するプラグ挿入工程と、
前記穿孔工程に先立って、前記分岐管部42に円周方向Rの半周にわたって切り開かれた半周溝20を有する前記T字管4を用意する工程と、
前記穿孔工程の後に、前記T字管4の前記分岐管部42に配管材6を接続する接続工程と、
前記接続工程の後に、前記半周溝20に挿入した前記第1ゲートG1を前記分岐管部42から抜く工程とを備え、
前記プラグ挿入工程において、前記第1ゲートG1又は前記第1ゲートG1と同一形状および構造を有する別の第1ゲートを前記プラグとして前記切削溝10から前記既設管1内に挿入することを特徴とする不断流工法。 - 請求項1において、
前記プラグ挿入工程において、前記第1ゲートG1を前記プラグとして前記切削溝10から前記既設管1内に挿入することを特徴とする、不断流工法。 - 請求項1もしくは2において、
前記穿孔工程の後に、前記分岐管部42に前記配管材6としてのバタフライ弁を接続して、前記接続工程が実行され、
前記バタフライ弁が閉弁された状態で、前記第1ゲートG1を前記分岐管部42から抜く工程が実行されることを特徴とする、不断流工法。 - 請求項3において、
前記バタフライ弁にバイパス配管を接続する工程と、
前記バイパス配管の接続後に、前記第1ゲートG1で前記既設管1内の流体の流れを止める工程を実行することを特徴とする、不断流工法。 - 請求項2において、
前記分岐管部42は、前記半周溝20の真上に向って延び前記第1ゲートG1の第1アクセス通路43を定義する第1筒部44を有し、
前記分岐管部42の径方向に平行に、かつ、水平方向に進退移動して、前記第1アクセス通路43を開閉する第2ゲートG2を前記分岐管部42に設置する工程を更に備え、
前記第2ゲートG2により前記第1アクセス通路43を開閉して前記第1ゲートG1を前記分岐管部42から抜く工程を実行する、不断流工法。 - 請求項5において、
前記ケース5は前記切削溝10の真上に向って延び前記第1ゲートG1の第2アクセス通路53を定義する第2筒部54を有し、
前記第2ゲートG2を前記第1筒部44から取り外す工程と、
前記ケース5の径方向に平行に、かつ、水平方向に進退して、前記第2アクセス通路53を開閉する前記第2ゲートG2を前記第2筒部54に設置する工程と、
前記第2ゲートG2により前記第2アクセス通路53を開閉して、前記既設管1に挿入した前記第1ゲートG1を前記既設管1から抜く工程とを更に備える、不断流工法。 - T字管4の分岐管部42に第1ゲートG1を有する穿孔用の不断流装置であって、
前記T字管4の前記分岐管部42には円周方向Rの半周にわたって切り開かれた半周溝20が形成され、
前記半周溝20は両端において下方に向って凸の一対の半円形状部21と、前記円周方向Rに延び前記半円形状部21同士を連ねる一定幅の溝部22とを備え、
前記第1ゲートG1は、前記半周溝20から前記分岐管部42内に挿入される円形状部を有する弁体11と、前記弁体11の側方に向かって突出する一対の弁体側部12と、前記弁体側部12から下方に向って延びる一対のガイダ13と、シール用のゴムパッキン14とを備え、
前記ゴムパッキン14は、
前記円形状部の上半部に装着され、前記溝部22を定義する一対の平行な第1端面に接するひも状の一対の上部15と、
前記円形状部の下半部に装着され、前記分岐管部42の内周面に接するひも状の下部16と、
前記弁体11の両サイドに各々装着される一対の中間部17とを備え、
前記各中間部17には各々前記一対の上部15が上方から連なり前記下部16が下方から連なり、
前記各中間部17は前記円形状部に嵌る半円柱状部18を有し、
前記各中間部17は前記弁体側部12の下面に接合される上面F0と、前記弁体11の側面に接合される第1側面F1と、前記ガイダ13に接合される第2側面F2とを有する、不断流装置。 - 穿孔用の不断流装置であって、
本体部41および分岐管部42を有するT字管4と第1ゲートG1とを有し、
前記分岐管部42には円周方向Rの半周にわたって切り開かれた半周溝20が形成され、
前記第1第1ゲートG1は前記半周溝20から前記分岐管部42内に侵入して前記分岐管部42内の流体の流れを止め、
前記半周溝20の真上に向って延び前記第1ゲートG1の第1アクセス通路43を定義する第1筒部44が前記分岐管部42に結合され、
前記分岐管部42の径方向に平行に進退移動して、前記第1アクセス通路43を開閉する第2ゲートG2が設けられ、
前記第2ゲートG2が前記アクセス通路43を開いている際に前記第2ゲートG2を収容する鞘2が設けられ、
前記第1筒部44には前記第2ゲートG2を含む前記鞘2が装着される第1装着フランジ45が設けられ、
前記第1筒部44における前記第1装着フランジ45の内側の部分に小弁体Vの第1収容部46が設けられ、
前記第1収容部46内の前記小弁体Vを前記第1筒部44の外から開閉操作することで前記鞘2の着脱を可能とする操作部31が設けられている、不断流装置。
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