WO2020013008A1 - 配管構造および工法 - Google Patents
配管構造および工法 Download PDFInfo
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- WO2020013008A1 WO2020013008A1 PCT/JP2019/026117 JP2019026117W WO2020013008A1 WO 2020013008 A1 WO2020013008 A1 WO 2020013008A1 JP 2019026117 W JP2019026117 W JP 2019026117W WO 2020013008 A1 WO2020013008 A1 WO 2020013008A1
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- WIPO (PCT)
- Prior art keywords
- straight pipe
- pipe
- groove
- pair
- circumferential direction
- Prior art date
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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
- F16L55/10—Means for stopping flow from or in pipes or hoses
- F16L55/105—Closing devices introduced radially into the pipe or hose
-
- 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
- F16L9/00—Rigid pipes
- F16L9/12—Rigid pipes of plastics with or without reinforcement
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C3/00—Milling particular work; Special milling operations; Machines therefor
- B23C3/28—Grooving workpieces
- B23C3/34—Milling grooves of other forms, e.g. circumferential
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
- B26D3/00—Cutting work characterised by the nature of the cut made; Apparatus therefor
- B26D3/16—Cutting rods or tubes transversely
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
- B29C65/04—Dielectric heating, e.g. high-frequency welding, i.e. radio frequency welding of plastic materials having dielectric properties, e.g. PVC
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
- B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
- B29C66/53—Joining single elements to tubular articles, hollow articles or bars
- B29C66/532—Joining single elements to the wall of tubular articles, hollow articles or bars
-
- 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
- F16L41/06—Tapping pipe walls, i.e. making connections through the walls of pipes while they are carrying fluids; Fittings therefor making use of attaching means embracing the pipe
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2793/00—Shaping techniques involving a cutting or machining operation
- B29C2793/0054—Shaping techniques involving a cutting or machining operation partially cutting through the material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2023/00—Tubular articles
- B29L2023/22—Tubes or pipes, i.e. rigid
Definitions
- the present invention relates to a piping structure in which a straight valve made of a polyolefin-based material is provided with a gate valve and the like, and a method for obtaining the piping structure.
- an object of the present invention is to reduce the number of welded portions in a piping structure or a method in which a valve or the like is provided in a polyolefin-based straight pipe.
- the piping structure of the present invention includes a straight pipe 1 made of a polyolefin-based material, A pair of ridges 15 made of a polyolefin material and extending in the circumferential direction R along the outer surface 13 of the straight pipe 1 and separated from each other in the axial direction S of the straight pipe 1; A pipe member 2 having a plurality of metal divided cases 21 and 22 divided in the circumferential direction R of the straight pipe 1 and surrounding a part of the straight pipe 1; A pair of engaging portions formed on at least one of the split cases and engaged with the pair of protrusions, respectively.
- the polyolefin-based straight pipe 1 is flexible, if the opening of the straight pipe 1 is to be greatly expanded by the force acting on the straight pipe 1, the engaging portion 23 is engaged with the ridge 15, Prevent the opening from expanding. In the present invention, only the portion of the pair of ridges 15 needs to be welded. Therefore, the number of welded portions is small.
- the piping structure of the present invention includes a straight pipe 1 made of a polyolefin-based material, A pair of engagement second grooves 1G extending in the circumferential direction R along the outer surface 13 of the straight pipe 1 and separated from each other in the axial direction S of the straight pipe 1; A pipe member 2 having a plurality of metal divided cases 21 and 22 divided in the circumferential direction R of the straight pipe 1 and surrounding a part of the straight pipe 1; A pair of engagement portions 23 formed on at least one of the divided cases 21 and 22 and respectively engaged with the pair of engagement second grooves 1G; A bottomed first groove G formed on the outer surface 13 of the straight pipe 1 and extending in the circumferential direction R of the straight pipe 1 between the pair of engagement grooves 1G; A knife gate 4 which forms a part of the pipe member 2 and cuts a bottom 1S of the bottomed first groove G; A housing part 45 that forms a part of the pipe member 2 and houses the knife gate 4 in a valve-open state.
- the engaging portions 23 of the split cases 21 and 22 are engaged with the pair of second grooves 1G for engagement. Therefore, there is no need to weld the case to the straight pipe. Further, the bottomed first groove G is formed, and the knife gate 4 can easily cut the thin bottom 1S. Further, there is a bottom 1S, and chips generated by cutting do not enter the straight pipe 1.
- the polyolefin-based material refers to polyethylene, polypropylene, polybutene and the like.
- 1A and 1B are a cross-sectional view and a vertical cross-sectional view, respectively, showing one embodiment of the steps of the method according to the present invention.
- 2A and 2B are a cross-sectional view and a vertical cross-sectional view, respectively, showing another example of the steps of the method according to the present invention.
- 3A and 3B are a cross-sectional view and a vertical cross-sectional view, respectively, showing an example of the steps of the method according to the present invention.
- 4A and 4B are a cross-sectional view and a vertical cross-sectional view, respectively, showing an example of the steps of the method according to the present invention.
- FIGS. 5A and 5B are a cross-sectional view and a vertical cross-sectional view, respectively, illustrating an example of the steps of the method according to the present invention.
- FIGS. 5A and 5B only the welded portions are hatched.
- 6A and 6B are a cross-sectional view and a vertical cross-sectional view, respectively, illustrating an example of the steps of the method according to the present invention.
- FIG. 7 is a cross-sectional view showing an example of the piping structure.
- FIG. 8 is a longitudinal sectional view showing the piping structure.
- FIG. 9 is a cross-sectional view showing the piping structure.
- FIG. 10 is a longitudinal sectional view showing the piping structure.
- FIG. 11 is a cross-sectional view showing a bottomed first groove, a valve body, and the like.
- FIG. 12 is a sectional view showing the bottomed first groove, the valve body, and the like.
- FIG. 13 is a cross-sectional view showing another piping structure.
- FIG. 14 is a longitudinal sectional view of the same.
- FIG. 15 is a schematic perspective view showing steps of a method according to another example.
- FIG. 16 is a schematic perspective view showing the steps of the method according to the example.
- 17A and 17B are a longitudinal sectional view and a transverse sectional view, respectively, showing a cutting tool and a cutter according to the second embodiment.
- 18A and 18B are a longitudinal sectional view and a transverse sectional view, respectively, showing a skin forming step of Example 2.
- a bottomed first groove G formed on the outer surface 13 of the straight pipe 1 and extending in the circumferential direction R of the straight pipe 1 between the pair of ridges 15,
- a knife gate 4 which forms a part of the pipe member 2 and cuts a bottom 1S of the bottomed first groove G;
- a housing part 45 that forms a part of the pipe member 2 and houses the knife gate 4 in a valve-open state.
- the knife gate 4 cuts the bottom 1S of the first groove, and further cuts into the inner peripheral surface 14 of the straight pipe 1, so that the distribution path can be stopped.
- a preferred construction method of the first aspect is a step of arranging a curved rod-shaped piece P to be the pair of ridges 15 along the outer surface 13 of the straight pipe 1; Heating the piece P and welding the piece P to the straight pipe 1; Attaching the pipe member 2 to the straight pipe 1. In this case, there is no need to weld the entire pipe member 2 to the straight pipe 1.
- the pipe member 2 containing the knife gate 4 surrounds a part of the straight pipe 1 including the bottomed first groove G, and the knife gate 4 is connected to the bottomed first groove G.
- mounting the split cases 21 and 22 on the straight pipe 1 so as to face each other. In this case, since the bottomed first groove G is formed, the knife gate 4 can easily cut the thin bottom 1S. Further, since there is the bottom 1S, chips generated by the cutting do not enter the straight pipe 1.
- a preferred method of the second aspect is a step of cutting the straight pipe 1 to form the pair of second grooves 1G for engagement along the outer surface 13 of the straight pipe 1; Cutting the straight pipe 1 to form the bottomed first groove G in the straight pipe 1. In this case, there is no need to weld the pieces to the straight pipe 1. Therefore, pipe work can be performed more easily and at low cost.
- a more preferable construction method is a step of mounting a rotating body rotatable in the circumferential direction R of the straight pipe 1 around the straight pipe 1 and, in the mounting step, a milling cutting tool 3 is attached to the rotating body.
- the cutter 32 which has is attached, By rotating the cutting tool 3 together with the rotating body in the circumferential direction R of the straight pipe 1 while rotating the milling-shaped cutting tool 3 around the central axis 30 of the tool, the outside of the straight pipe 1 is rotated.
- the bottom of the first groove G is formed of a thin skin 1S. Therefore, by piercing the thin skin 1S, the opening 10 can be formed without generating the cutting powder T. In this case, the bottomed first groove G can be accurately formed by the milling cutting tool 3. Furthermore, by turning the cutting tool 3 together with the case 20, the milling-shaped cutting tool 3 can form the bottomed first groove G with higher accuracy. Therefore, the skin 1S can be set to an appropriate thickness, the fluid can be sealed in the straight pipe 1, and the skin 1S can be easily broken by the blade.
- Piping material 2 The pipe member 2 shown in FIGS. 7 to 10 may surround an existing pipe in a state where a fluid (for example, water or the like) is flowing in the existing pipe, and may insert a valve body or the like under a continuous flow. May be installed in the newly installed straight pipe 1.
- the pipe member 2 is a gate valve.
- the pipe member 2 includes a closed case 20.
- the sealed case 20 includes two divided cases 21 and 22 surrounding a part of the straight pipe 1.
- the first and second split cases 21 and 22 are split along an imaginary plane substantially orthogonal to the branch pipe portion 27.
- the pair of split cases 21 and 22 are externally fitted to the straight pipe 1 in the radial direction of the straight pipe 1, and are assembled by fastening the coupling portion 25 to each other with the assembly bolt nut 26. It is preferable that each of the split cases 21 and 22 in the connecting portion 25 is in contact with each other by metal touch.
- each of the split cases 21 and 22 has an inner peripheral surface 24 curved along the outer surface 13 of the straight pipe 1.
- the first divided case 21 is integrally formed with the branch pipe portion 27 having a branched branch hole 29 protruding and extending in the radial direction of the straight pipe 1. Have been.
- Branch pipe part 27 A flange 28, such as a plate-like flange, is formed integrally with the branch pipe portion 27, and a valve cover 44 or the like shown in FIG.
- the knife gate 4 of FIGS. 7 and 8 is housed in the closed case 20.
- a packing mounting portion 61 is formed on the inner surface of the divided case 21 (22).
- the rubber packing 60 shown in FIG. 8 is mounted on the packing mounting portion 61, and the gap between the existing pipe 1 and the sealed case 20 is sealed by the rubber packing 60 as shown in FIGS. 7 and 8.
- the present piping structure is a piping structure in which a gate valve (knife gate) 4 is incorporated in a straight pipe 1.
- the straight pipe 1 has a first groove G.
- the first groove G extends in the circumferential direction R and has a bottom formed of the skin 1S.
- the first groove G can be formed by a milling tool or an end mill-shaped cutting tool described later.
- a part of the straight pipe 1 including the first groove G is surrounded by a case 20 shown in FIG.
- the case 20 of the present piping structure includes a valve cover 44 in addition to the first and second split cases 21 and 22.
- valve cover 44 accommodates a part of the knife gate 4. That is, the valve cover 44 constitutes a part of the case 20, and the valve cover 44, the first divided case 21 and the second divided case 22 accommodate the knife gate 4.
- the valve cover 44 is connected to the first split case 21 via the flange 28.
- the valve stem 43 is rotated so that the knife gate 4 approaches the first groove G and breaks through the skin 1S of the first groove G to form the opening 10 in FIG.
- the knife gate 4 is moved in the pipe diameter direction D.
- the knife gate 4 has a circular knife shape and includes a valve body 40, a blade 41, and a seal portion 42.
- the valve body 40 in FIGS. 15 and 16 is a circular portion that enters the inside of the straight pipe 1.
- the blade 41 is made of metal and is provided on the distal end side of the valve body 40 to break the thin skin 1S to form the opening 10.
- the seal part 42 in FIG. 15 is made of rubber and is provided on the base end side opposite to the tip end side and closes the opening 10 by contacting the portion of the straight pipe 1 around the first groove G.
- the metal blade 41 is in contact with the inner peripheral surface 14 of the straight pipe 1, and the rubber sealing portion 42 is a portion of the straight pipe 1 around the first groove G. Touch
- the pair of ridges 15 are also made of a polyolefin-based material and extend along the outer surface 13 of the straight pipe 1 in a circumferential direction R, for example, over a half circumference, and are separated from each other in the axial direction S of the straight pipe 1.
- the closed case 20 (divided cases 21 and 22) of the pipe member 2 in FIG. 8 is made of metal, for example, FCD or steel plate.
- the first split case 21 is formed with a pair of engaging portions 23 that respectively engage with the pair of protrusions 15.
- the engagement portion 23 is formed by a pair of protrusions that engage with each of the protrusions 15.
- the cutting tool 3 is moved toward the center of the straight pipe 1 by a cutter having the end mill-shaped cutting tool 3, and a part of the pipe wall 12 of the straight pipe 1 is cut by the cutting tool 3. .
- a part of the straight pipe 1 was cut as shown in FIGS. 2A and 2B by rotating the cutter in the circumferential direction R as shown in FIG. 2A while rotating the cutter together with a cutter case (not shown).
- a groove G having a bottom is formed over substantially a half circumference.
- the cutting tool 3 cuts the outer surface 13 of the straight pipe 1 to form a first skin 1S having the bottom of the thin skin 1S formed on the inner surface of the straight pipe 1.
- a groove G is formed in the straight pipe 1.
- the cutting tool 3 is prevented from penetrating the straight pipe 1. Send toward the center of straight pipe 1. Then, while rotating the milling-shaped cutting tool 3 around the center axis 30 of the tool, the cutting tool 3 is turned in the circumferential direction R of the straight pipe 1 together with a cutter case (not shown),
- the thin skin forming step is performed by forming the bottomed first groove G that is long in the circumferential direction R, for example, over about half the circumference in the circumferential direction R. In the skin forming step, the depth of cutting by the cutting tool 3 needs to be smaller than the thickness of the straight pipe 1 so that the first groove G has a bottom.
- the bottomed first groove G may be formed by the milling cutting tool 3 of FIGS. 1A and 1B.
- the positioning jig 5 is fixed to the straight pipe 1 as shown in FIGS. 3A and 3B.
- the positioning jig 5 has a positioning portion 51 fitted into the first groove G and a pair of arrangement holes 50.
- a pair of curved rod-shaped pieces P are fitted along the outer surface 13 of the straight pipe 1 by being fitted into the pair of arrangement holes 50. Is done. Note that a heating wire (not shown) is embedded in each piece P.
- the pieces P and the straight pipe 1 are made of the same type of polyethylene, and are welded to each other by raising the temperature.
- a welder for heating and welding the piece P and the straight pipe 1 may be used.
- the straight pipe 1 is formed with the arc-shaped bottomed first groove G extending in the circumferential direction R and the pair of protrusions 15.
- valve cover 44 is mounted on the flange 28 of the first split case 21 in advance.
- a knife gate 4 which can enter the straight pipe 1 is incorporated.
- the knife gate 4 is installed on the straight pipe 1.
- Opening forming process After the installation, as shown in FIGS. 9 to 10, an opening forming step of breaking the thin skin 1S to form the opening 10 is performed.
- the blade 41 of the knife gate 4 penetrates the thin skin 1S to form the opening 10, and the valve body 40 pushes and expands the opening 10.
- the first groove G extends in the circumferential direction R of the straight pipe 1, and as shown in FIG. It may be formed thinner than both sides in the direction S.
- the step of forming the opening 10 is performed by the blade 41 breaking the thin central portion.
- the blade 41 of FIG. 11 comes into contact with the thin skin 1S of the straight pipe 1 and cuts the relevant portion as shown in FIG. . Subsequently, the blade 41 further cuts and opens the thin skin 1S, and the blade 41 cuts both sides of the straight pipe 1 until the blade 41 contacts the inner peripheral surface 14 of the straight pipe 1 as shown in FIG.
- Insertion process That is, as shown in FIGS. 11 (c) to 11 (d), in the opening forming step, the blade 41 cuts the thin skin 1S and pushes the thin skin 1S open and breaks, and the valve body 40 is straight piped together with the blade 41. Invade into 1.
- an insertion step of inserting the knife gate 4 into the straight pipe 1 is performed together with the opening forming step.
- the seal portion 42 on the base end side of the valve body 40 in FIG. 10 enters the opening 10 and comes into contact with the portion of the straight pipe 1 around the opening 10 to seal the portion of the opening 10.
- valve body 40 of the knife gate enters the straight pipe 1, the seal portion 42 comes into contact with the portion of the straight pipe 1 around the opening 10, and the distal end side of the valve body 40 is
- the above-described insertion step is performed in contact with the inner peripheral surface 14 of the second member.
- the knife gate 4 is inserted, and as shown in FIGS. 9 and 10, the conduit of the straight pipe 1 is closed and water is stopped. After the water stoppage, the work on the downstream side of the straight pipe 1 is performed. Thereafter, when the operating portion of the valve stem 43 is rotated in the reverse direction as required, the knife gate 4 is retracted from the straight pipe 1 as shown in FIG.
- the pipe structure of FIG. 10 obtained in this manner is a PE pipe because the engaging portion 23 is engaged with the pair of ridges 15 even if the opening 10 is to be expanded from the beginning when the opening 10 is formed. Also, the opening 10 can be prevented from expanding.
- the opening 10 may be, for example, a circular opening for a branch pipe.
- the knife gate 4 does not require an elastomer seal portion (42). That is, as shown in FIG. 10, when the valve body 40 enters the straight pipe 1, the skin 1 ⁇ / b> S of the straight pipe 1 comes into contact with the valve body 40. Since the thin skin 1S is an elastomer, the space between the thin skin 1S and the metal valve body 40 will be sealed without the seal portion 42.
- the thickness of the thin skin 1S may be preferably about 3 mm to 5 mm. Further, it may be preferable that the angle of the tip of the cutting tool 3 is set to about 120 ° to 160 °.
- the blade 41 of the knife gate 4 is not limited to the circumferential portion in contact with the inner peripheral surface 14 of the straight pipe 1, but the blade 41 is cut so that the knife gate 4 bites into the straight pipe 1 at both ends of the opening 10 of the straight pipe 1. It may be formed.
- the straight pipe 1 may be cut by a stepped end mill-shaped cutting tool 3 to form a stepped first groove G as shown in FIG. 12B.
- the thickness of the skin 1S may be about 0.3 mm-0.5 mm.
- the cut surface of the stepped groove G may be in contact with the valve body 40 to perform sealing.
- 1A to 2B may be executed by attaching a cutter to the closed case 20 and rotating the cutting tool 3 together with the closed case 20.
- the welding piece P of FIG. 4A may be welded to the straight pipe 1 in a state where the piece P is attached to the sealed case 20 and positioned. That is, the welding of the pieces P may be performed after the cutting step and the assembling step.
- the ridge 15 extends over the entire circumference in the circumferential direction R along the outer surface 13 of the straight pipe 1 in FIG.
- a pair of second grooves 1G for engagement which are separated from each other in the axial direction S.
- a pair of engaging portions (engaging protrusions) 23 formed on both the pair of split cases 21 and 22 and respectively engaging with the pair of second grooves 1G for engagement are provided. It is preferable that the engagement portion 23 is an engagement ridge that extends in the circumferential direction R.
- the straight pipe 1 is cut to form the pair of second grooves 1G for engagement along the outer surface 13 of the straight pipe 1. Further, the straight pipe 1 is cut to form the bottomed first groove G in the straight pipe 1. Note that the depth of the first groove G is deeper than the second groove 1G.
- the second groove 1G for engagement may be formed by a milling or end mill-shaped cutting tool, or may be formed by a cutting tool in a bite shape.
- FIGS. 17A to 18B show a cutting tool 3 and a cutter 32 according to another example.
- a rotating body 2 different from the case 20 is used in the thin skin forming step and the like.
- the present invention can also be favorably employed when piping a new pipe 1 to be an existing pipe. In particular, it can be advantageously used when a new valve is installed in a continuous and long polyethylene pipe.
- the rotating body 2 has a cutting base 2B, two roller chains 2C, four connecting tools 2D, and four rollers 2R.
- a cutter 32 is attached to the base 2B.
- the roller chain 2C and the roller 2R are in contact with the outer periphery of the new pipe 1 that becomes the existing pipe 1, and the rotating body 2 can rotate in the circumferential direction R of the new pipe 1 or the existing pipe 1.
- the connecting tool 2D connects the roller chain 2C and the base 2B.
- This structure can be applied to a large number of sizes with one kind of rotating body 2 regardless of the outer diameter of the new pipe 1 or the existing pipe 1.
- a rotating body 2 rotatable in the circumferential direction R of a newly-installed straight pipe 1 to be an existing pipe 1 is mounted around the straight pipe 1.
- a cutter 32 having a milling cutting tool 3 is attached to a base 2B of the rotating body 2.
- the cutting tool 3 is sent toward the center of the straight pipe 1 while rotating the cutting tool 3 around the central axis 30. After that, while rotating the milling-shaped cutting tool 3 of FIG. 18B around the central axis 30 of the tool, the cutting tool 3 is turned together with the rotating body 2 in the circumferential direction R of the straight pipe 1.
- a thin skin forming step of cutting the outer surface 13 of the straight pipe 1 to form a first groove G having a bottom and formed in the thin skin 1S and having a long bottom in the circumferential direction R in the straight pipe 1 is executed.
- the rotating body 2 and the cutter 32 are removed from the new pipe 1, the surface of the straight pipe 1 is wiped with a cloth or the like, and the chips generated by the cutting are wiped off.
- the case 20, the valve cover 44 and the knife gate 4 in FIGS. 13 and 14 are assembled to the straight pipe 1 in the same manner as described above.
- the case 20 is mounted on the straight pipe 1 such that the case 20 containing the knife gate 4 surrounds the straight pipe 1 including the first groove G.
- the pipe member 2 containing the knife gate 4 surrounds a part of the straight pipe 1 including the bottomed first groove G, and the knife gate 4 has the bottomed first groove G.
- the split cases 21 and 22 are mounted on the pipe 1 so as to face the one groove G.
- a step of piercing the thin skin 1S to form the opening 10 is performed as necessary. That is, when the water stoppage is required, as shown in FIGS. 15B to 16B, the knife gate 4 is pushed toward the straight pipe 1 to form the opening 10, and the knife gate 4 is straightened. Insert into tube 1.
- the end of the end mill may not have a mountain shape, and a groove having a constant depth may be formed by the end mill. Both the first and second grooves may be formed using a rotating body. Therefore, such changes and modifications are to be construed as falling within the scope of the present invention, which is defined by the appended claims.
- the method and the piping structure of the present invention can be used for inserting a gate valve into a pipe line of water or gas, and stopping the flow of fluid by the inserted gate valve. Further, the construction method of the present invention can be applied to a case where a valve is inserted or a branch pipe is continuously provided in addition to a newly installed pipe.
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- Valve Housings (AREA)
- Branch Pipes, Bends, And The Like (AREA)
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Abstract
Description
したがって、本発明の目的は、ポリオレフィン系の直管にバルブ等を設けた配管構造や工法において、溶着部分を少なくすることである。
ポリオレフィン系材料で構成され前記直管1の外表面13に沿って円周方向Rに延び前記直管1の軸方向Sに互いに離間する一対の突条15と、
前記直管1の円周方向Rに分割され、前記直管1の一部を囲繞する複数の金属製の分割ケース21,22を持つ配管材2と、
前記分割ケース21,22の少なくとも一方に形成され前記一対の突条15に各々係合する一対の係合部23と、を備える。
本発明において溶着が必要なのは、一対の突条15の部分のみである。したがって、溶着部分が少ない。
前記直管1の外表面13に沿って円周方向Rに延び前記直管1の軸方向Sに互いに離間する一対の係合用の第2溝1Gと、
前記直管1の円周方向Rに分割され、前記直管1の一部を囲繞する複数の金属製の分割ケース21,22を持つ配管材2と、
前記分割ケース21,22の少なくとも一方に形成され前記一対の係合用の第2溝1Gに各々係合する一対の係合部23と、
前記一対の係合溝1Gの間において前記直管1の外表面13に形成され前記直管1の円周方向Rに延びる有底の第1溝Gと、
前記配管材2の一部を構成し前記有底の第1溝Gの底1Sを切り込むナイフゲート4と、
前記配管材2の一部を構成し開弁状態の前記ナイフゲート4を収容する収容部45と、を備える。
また、有底の第1溝Gが形成されており、ナイフゲート4は薄肉の底1Sを切り込み易い。更に、底1Sがあり、切削により生じた切粉が直管1に侵入しない。
前記配管材2の一部を構成し前記有底の第1溝Gの底1Sを切り込むナイフゲート4と、
前記配管材2の一部を構成し開弁状態の前記ナイフゲート4を収容する収容部45と、を備える。
前記ピースPを昇温させて前記ピースPを前記直管1に溶着する工程と、
前記配管材2を前記直管1に装着する工程と、を備える。
この場合、配管材2全体を直管1に溶着する必要がない。
前記ピースPを昇温させて前記ピースPを前記直管1に溶着する工程と、
前記直管1を切削して、前記直管1に前記有底の第1溝Gを形成する工程と、
前記ナイフゲート4を内蔵した前記配管材2が前記有底の第1溝Gを含む前記直管1の一部を囲繞するように、かつ、前記ナイフゲート4が前記有底の第1溝Gに対峙するように、前記分割ケース21、22を前記直管1に装着する工程と、を備える。
この場合、有底の第1溝Gが形成されているので、ナイフゲート4は薄肉の底1Sを切り込み易い。また、底1Sがあるので、切削により発生した切り粉が直管1内に侵入しない。
前記直管1を切削して、前記直管1に前記有底の第1溝Gを形成する工程とを備える。
この場合、直管1にピースを溶着する必要がない。そのため、管工事を更に容易かつローコストに行うことができる。
前記ミリング状の切削工具3を前記工具の中心軸30のまわりに回転させながら、前記切削工具3を前記回転体と共に前記直管1の周方向Rに旋回させることで、前記直管1の外表面13を切削して、前記周方向Rに長い有底の第1溝Gを前記直管1に形成する薄皮形成工程と、
前記直管1を切削して、前記一対の係合用の第2溝1Gを前記直管1の外表面に形成する工程と、
前記回転体および前記カッター32を前記直管1から取り外す工程と、
前記ナイフゲート4を内蔵した前記配管材2が前記有底の第1溝Gを含む前記直管1の一部を囲繞するように、かつ、前記ナイフゲート4が前記有底の第1溝Gに対峙するように、前記分割ケース21,22を前記管1に装着する工程と、を備える。
この場合、切削工具3により直管1に開口を形成するのではなく、有底の第1溝Gを形成する。そのため、切削工具3で直管1を切削した際に生じた切り粉Tが管1内に侵入するおそれはない。
一方、前記第1溝Gの底は薄皮1Sで形成されている。そのため、前記薄皮1Sを突き破ることで、切り粉Tが発生することなく、開口10を形成することができる。
また、この場合、ミリング状の切削工具3により有底の第1溝Gを精度良く形成することができる。更に、ケース20と共に切削工具3を旋回させることで、ミリング状の切削工具3は有底の第1溝Gを更に精度良く形成することができる。そのため、薄皮1Sを適宜の厚さに設定でき、直管1内に流体を密封できると共に、刃により薄皮1Sを容易に破ることができる。
まず、配管構造の全体構成について説明する。
図7~図10に示す配管材2は、既設管の管内に流体(たとえば、水等)が流れている状態で既設管を囲繞し、不断流下で弁体の挿入等が行われてもよいが、新設の直管1に設置されてもよい。本例において、配管材2は仕切弁である。
図7および図8に示すように、配管材2は密閉ケース20を備えている。密閉ケース20は、直管1の一部を囲繞する2個の分割ケース21,22を備える。
前記枝管部27には、たとえば板状フランジのようなフランジ28が一体に形成されており、該フランジ28には図7に示す弁蓋44等が取り付けられる。
なお、薄皮形成工程において、第1溝Gが有底となるように、切削工具3により切削する深さは直管1の厚さよりも小さくする必要がある。
その後、図7および図8に示すように、直管1の一部を前記密閉ケース20によって気密状態で囲繞する。
なお、前記両分割ケース21,22の結合部25を前記ボルトナット26で締結することで、直管1の一部を密閉ケース20によって気密状態で囲繞する。
前記設置後、図9-図10のように、前記薄皮1Sを破って開口10を形成する開口形成工程が実行される。本例の場合、前記ナイフゲート4の刃41が前記薄皮1Sを突き破って前記開口10を形成し、更に、弁本体40が前記開口10を押し拡げる。
すなわち、図11(c)~(d)に示すように、前記開口形成工程において、刃41が薄皮1Sを切り開くと共に刃41が薄皮1Sを押し開いて破り、弁本体40は刃41と共に直管1内に侵入する。本例の場合、開口形成工程と共にナイフゲート4を直管1内に挿入する挿入工程が実行される。
本例においては、前記突条15(図8)を形成する代りに、図13の前記直管1の外表面13に沿って円周方向Rに全周にわたって延び、図14の前記直管1の軸方向Sに互いに離間する一対の係合用の第2溝1Gが設けられている。一方、一対の前記分割ケース21,22の双方に形成され前記一対の係合用の第2溝1Gに各々係合する一対の係合部(係合突起)23が設けられている。係合部23は円周方向Rに連なる係合突条であるのが好ましい。
たとえば、エンドミルの先端は山型ではなく、エンドミルで一定の深さの溝を形成してもよい。第1および第2溝の双方を回転体を用いて形成してもよい。
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、本発明の工法は、新設の配管の他、不断で弁挿入や分岐配管を設ける場合にも採用することができる。
2A:回転体 2B:ベース 2C:ローラチェーン 2D:連結具 2R:ローラ
2:配管材 20:ケース 21:第1分割ケース 22:第2分割ケース
23:係合部 24:内周面 25:結合部 26:組立ボルトナット
27:枝管部 28:フランジ 29:分岐孔
3:切削工具 30:中心軸 32:カッター 33:送り装置
4:ナイフゲート 40:弁本体 41:刃 42:シール部 43:弁棒
44:弁蓋 45:収容部
5:位置決め治具 50:配置孔 51:位置決め部
G:第1溝 1G:第2溝 R:円周方向 S:軸方向
Claims (7)
- ポリオレフィン系材料で構成された直管1と、
ポリオレフィン系材料で構成され前記直管1の外表面13に沿って円周方向Rに延び前記直管1の軸方向Sに互いに離間する一対の突条15と、
前記直管1の円周方向Rに分割され、前記直管1の一部を囲繞する複数の金属製の分割ケース21,22を持つ配管材2と、
前記分割ケース21,22の少なくとも一方に形成され前記一対の突条15に各々係合する一対の係合部23と、を備える配管構造。 - 請求項1において、前記一対の突条15の間において前記直管1の外表面13に形成され前記直管1の円周方向Rに延びる有底の第1溝Gと、
前記配管材2の一部を構成し前記有底の第1溝Gの底1Sを切り込むナイフゲート4と、
前記配管材2の一部を構成し開弁状態の前記ナイフゲート4を収容する収容部45と、を備える配管構造。 - 請求項1の配管構造を得るための工法であって、
前記円周方向Sに延び前記一対の突条15となる湾曲した棒状のピースPを前記直管1の外表面13に沿って配置する工程と、
前記ピースPを昇温させて前記ピースPを前記直管1に溶着する工程と、
前記配管材2を前記直管1に装着する工程と、を備える工法。 - 請求項2の配管構造を得るための工法であって、
前記円周方向Sに延び前記一対の突条15となる湾曲した棒状のピースPを前記直管1の外表面13に沿って配置する工程と、
前記ピースPを昇温させて前記ピースPを前記直管1に溶着する工程と、
前記直管1を切削して、前記直管1に前記有底の第1溝Gを形成する工程と、
前記ナイフゲート4を内蔵した前記配管材2が前記有底の第1溝Gを含む前記直管1の一部を囲繞するように、かつ、前記ナイフゲート4が前記有底の第1溝Gに対峙するように、前記分割ケース21、22を前記直管1に装着する工程と、を備える工法。 - ポリオレフィン系材料で構成された直管1と、
前記直管1の外表面13に沿って円周方向Rに延び前記直管1の軸方向Sに互いに離間する一対の係合用の第2溝1Gと、
前記直管1の円周方向Rに分割され、前記直管1の一部を囲繞する複数の金属製の分割ケース21,22を持つ配管材2と、
前記分割ケース21,22の少なくとも一方に形成され前記一対の係合用の第2溝1Gに各々係合する一対の係合部23と、
前記一対の係合溝1Gの間において前記直管1の外表面13に形成され前記直管1の円周方向Rに延びる有底の第1溝Gと、
前記配管材2の一部を構成し前記有底の第1溝Gの底1Sを切り込むナイフゲート4と、
前記配管材2の一部を構成し開弁状態の前記ナイフゲート4を収容する収容部45と、を備える配管構造。 - 請求項5の配管構造を得るための工法であって、
前記直管1を切削して、前記一対の係合用の第2溝1Gを前記直管1の外表面13に沿って形成する工程と、
前記直管1を切削して、前記直管1に前記有底の第1溝Gを形成する工程とを備える、工法。 - 請求項5の配管構造を得るための工法であって、
前記直管1の周方向Rに回転可能な回転体を前記直管1のまわりに装着する工程と、前記装着する工程において、前記回転体にはミリング状の切削工具3を持つカッター32が取り付けられ、
前記ミリング状の切削工具3を前記工具の中心軸30のまわりに回転させながら、前記切削工具3を前記回転体と共に前記直管1の周方向Rに旋回させることで、前記直管1の外表面13を切削して、前記周方向Rに長い有底の第1溝Gを前記直管1に形成する薄皮形成工程と、
前記直管1を切削して、前記一対の係合用の第2溝1Gを前記直管1の外表面に形成する工程と、
前記回転体および前記カッター32を前記直管1から取り外す工程と、
前記ナイフゲート4を内蔵した前記配管材2が前記有底の第1溝Gを含む前記直管1の一部を囲繞するように、かつ、前記ナイフゲート4が前記有底の第1溝Gに対峙するように、前記分割ケース21,22を前記管1に装着する工程と、を備える工法。
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