US20010010233A1 - Valve insertion method and cutting tool - Google Patents
Valve insertion method and cutting tool Download PDFInfo
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- US20010010233A1 US20010010233A1 US09/821,156 US82115601A US2001010233A1 US 20010010233 A1 US20010010233 A1 US 20010010233A1 US 82115601 A US82115601 A US 82115601A US 2001010233 A1 US2001010233 A1 US 2001010233A1
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- Prior art keywords
- gate
- cutting tool
- valve
- already
- cutting
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Classifications
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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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S408/00—Cutting by use of rotating axially moving tool
- Y10S408/713—Tool having detachable cutting edge
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/0318—Processes
- Y10T137/0402—Cleaning, repairing, or assembling
- Y10T137/0441—Repairing, securing, replacing, or servicing pipe joint, valve, or tank
- Y10T137/0458—Tapping pipe, keg, or tank
- Y10T137/0463—Particular aperture forming means
- Y10T137/0469—Cutter or cutting tool
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/598—With repair, tapping, assembly, or disassembly means
- Y10T137/612—Tapping a pipe, keg, or apertured tank under pressure
- Y10T137/6123—With aperture forming means
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T408/00—Cutting by use of rotating axially moving tool
- Y10T408/89—Tool or Tool with support
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T408/00—Cutting by use of rotating axially moving tool
- Y10T408/89—Tool or Tool with support
- Y10T408/905—Having stepped cutting edges
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T408/00—Cutting by use of rotating axially moving tool
- Y10T408/89—Tool or Tool with support
- Y10T408/905—Having stepped cutting edges
- Y10T408/906—Axially spaced
Definitions
- This invention relates to a valve insertion method without stopping passage of fluid, and a cutting tool.
- a valve insertion method comprising drilling a hole in an already-installed pipe (or existing pipe) in a non-water-flow-stopping state, and inserting a valve in the hole thus cut in the already-installed pipe in a line including the same pipe has heretofore been known.
- FIGS. 15 ( a ) and 15 ( b ) shows an outline of a conventional valve insertion method disclosed in U.S. Pat. No. 4,516,598.
- an already-installed pipe 1 is enclosed with a sealing case 800 .
- the sealing case 800 houses a hole saw 802 and a gate 804 therein in advance.
- a circular opening is then drilled in the already-installed pipe 1 with the hole saw 802 .
- the sealing case 800 is turned as shown by arrows 850 in FIG. 15( a ), and the gate 804 is thereafter inserted into the circular opening 803 shown in FIG. 15( b ).
- FIGS. 15 ( a ), ( b ) enable the insertion of the valve after the completion of the pipe cut-off operation to be carried out speedily.
- the dimensions of the sealing case 800 increase because it is necessary that the hole saw 802 having the dimensions of which are equal to those of the gate 804 to be inserted is housed in the sealing case 800 .
- FIG. 16 shows an outline of a conventional valve insertion method disclosed in U.S. Pat. No. 5,611,365 and International Patent Laid-Open WO97/31207.
- an already-installed pipe 1 is enclosed with a sealing case 600 first.
- a gate 601 is then turned with the sealing case 600 to cut-off the already-installed pipe 1 with a cutting tool 602 fixed to a free end of the gate 601 .
- the dimensions of the sealing case 600 decrease because the cutting tool 602 has small dimensions.
- the cutting tool 602 is fixed to the gate 601 , the leakage of water is not perfectly prevented.
- the already-installed pipe 1 is cut-off with a tip type cutting tool 602 . Therefore, in order to cut into an already-installed pipe 1 comprising a cast iron pipe or a steel pipe, the sealing case 600 has to be turned many times, so that it takes much time to cut-off the pipe.
- U.S. Pat. No. 5,732,728 discloses a valve insertion method using an assembly provided with a rotary valve casing, a cutting assembly and a gate assembly.
- the gate assembly is fixed in place of the cutting assembly after a grooving operation is carried out, so that the dimensions of an apparatus decrease.
- a primary object of the present invention is to provide a valve insertion method capable of carrying out valve insertion work speedily and miniaturizing a sealing case.
- Another object of the present invention is to provide a cutting tool capable of improving a discharge rate of cutting chips producing in an operation for cutting an already-installed pipe (or existing pipe) in the valve insertion method.
- a valve assembly is inserted in an already-installed line by using a milling type cutting tool, the valve assembly and an operation valve so as to achieve these objects.
- a worker prepares in advance the cutting tool, the valve assembly and the operation valve.
- the cutting tool is supported so that it can be rotated freely around an axis set in an axial direction of the already-installed pipe, and it has cutting edges on its free end surface and outer circumferential surface.
- the valve assembly has a valve casing forming a flow passage, a gate housed in the valve casing, and a valve spindle adapted to slide the gate in a direction which crosses the fluid passage at substantially right angles thereto.
- the valve casing is provided with a first and second divisional cases separated from each other in the circumferential direction of the already-installed pipe.
- Either one of these divisional cases is provided with a tool entering hole opened toward the center of the already-installed pipe.
- the second divisional case is provided with a gate housing hole adapted to house the gate therein when the valve is opened, and enable the gate to move slidingly.
- the gate housing hole and tool entering hole are provided in positions spaced from each other in the axial direction of the pipe.
- the operation valve is fixed to the valve casing so that it can open and close the tool entering hole.
- This valve insertion method has an assembling step, a drilling step, a grooving step, a tool takeout step and a transfer step which will be described below.
- the cutting tool is fed in the radial direction of the already-installed pipe as it is made to take cutting motions.
- the “cutting motions” referred to above means motions for cutting the already-installed pipe with the cutting tool rotated around the set axis mentioned above.
- the valve casing is turned in the circumferential direction of the already-installed pipe with the cutting motions kept being made.
- the cutting tool is turned in the circumferential direction of the already-installed pipe, whereby the cutting tool is made to take feeding motions. Consequently, the already-installed pipe is cut in the whole of a circumferentially extending portion thereof with the cutting tool without producing a cut-off section.
- a cut groove is formed (cut) in the portion of the already-installed pipe, and extends in the direction of the range of the whole circumference thereof.
- the cutting tool is taken out from the valve casing via the operation valve after the completion of the grooving operation. Thereafter the operation valve is closed.
- valve casing is transferred in the axial direction of the already-installed pipe after the completion of the grooving operation, whereby the gate is transferred to a position corresponding to that of the cut groove.
- a valve assembly is inserted in an already-installed line by using a milling type cutting tool, a valve assembly and an operation valve.
- a worker prepares in advance the cutting tool, the valve assembly and the operation valve.
- the cutting tool is supported so that it can be rotated freely around an axis set in an axial direction of the already-installed pipe, and it has cutting edges on its free end surface and outer circumferential surface.
- the valve assembly has a valve casing forming a flow passage, a gate housed in the valve casing, and a valve spindle adapted to slide the gate in a direction which crosses the fluid passage at substantially right angles thereto.
- valve casing is provided with a first and second divisional cases separated from each other in the circumferential direction of the already-installed pipe.
- the second divisional case is provided with a gate housing hole, and a tool entering hole.
- the gate housing hole is adapted to house the gate therein when the gate is opened, and is opened in the flow passage to enable the gate to move slidingly.
- the tool entering hole is opened toward the center of the already-installed pipe diagonally with respect to the gate housing hole.
- the width of an opening, which is on the side of a free end of the gate, of the gate housing hole is set larger than the outer diameter of the cutting tool.
- the operation valve is fixed to the valve casing so that it can open and close the tool entering hole.
- This valve insertion method has an assembling step, a drilling step, a grooving step and a tool takeout step.
- the cutting tool is fed in the radial direction of the already-installed pipe by passing the cutting tool diagonally through a part of the gate housing hole as the cutting tool is made to take cutting motions.
- the “cutting motions” referred to above means motions for cutting the already-installed pipe with the cutting tool rotated around the set axis mentioned above.
- the valve casing is turned in the circumferential direction of the already-installed pipe with the cutting motions kept being made.
- the cutting tool is turned in the circumferential direction of the already-installed pipe, whereby the cutting tool is made to take feeding motions. Consequently, the already-installed pipe is cut in the whole of a circumferentially extending portion thereof with the cutting tool without producing a cut-off section.
- a cut groove is formed (cut) in the portion of the already-installed pipe, and extends in the direction of the range of the whole circumference thereof.
- the cutting tool is taken out from the valve casing via the operation valve after the completion of the grooving operation. Thereafter the operation valve is closed.
- the already-installed pipe can be cut with the cutting tool rotated independently of the valve casing, so that even a cast iron pipe or a steel pipe can be cut in a short period of time.
- the gate Since the gate is housed in the valve casing in advance, an upper working tank is not required. Moreover, since the groove is cut with a small cutting tool, the dimensions of the operation valve decrease. Accordingly, the dimensions of the valve assembly as a whole decrease.
- the “already-installed pipe” in the present invention means a pipe in which a fluid, such as water flows, and such a pipe is mostly buried in the ground.
- the “air-tightly enclosing” means sealing to such an extent that does not hinder the grooving (drilling and feeding) operation and the valve insertion operation carried out thereafter.
- a method of discharging with water the cutting chips, which are produced during the grooving operation, from a water discharge hole provided in the valve casing and opened during the grooving operation may be employed.
- the “cutting tool” used in this valve insertion method is a milling type tool having a plurality of cutting edges in each of the free end surface and outer circumferential surface thereof, so that it does not include a bite and a cutter wheel.
- a cutting tool provided with a plurality of tips made of a hard metal, or a cutting tool having the cutting edges of diamond particles are preferably used.
- the “cutting” referred to in the specification of the present invention means cutting a part of a pipe wall by rotating the cutting edges.
- the “feed motion” means causing the cutting tool to move to positions in which different parts of the pipe wall can be cut one after another with the cutting tool.
- the “inserting a valve assembly into an already-installed line” referred to in the specification of the present invention does not mean the physical insertion of a gate into a cut-off portion of an already-installed pipe but it means setting in an already-installed line (conduit) a valve assembly for preventing the leakage of water from and regulating a flow rate in the same line.
- valve assembly means an apparatus as a whole which includes a gate, a valve casing and a valve spindle.
- the “gate” means a member for closing a flow passage.
- the “valve casing” means a member housing the gate irrespective of the opened or closed condition of the gate.
- the cutting tool used in the present invention is suitable for cutting an already-installed pipe in a non-fluid-flow-stopping condition.
- This cutting tool is provided with a substantially cylindrical cutter body, a plurality of first tips, a plurality of second tips, and a plurality of recesses formed in the cutter body.
- the cutter body has a base end surface, a free end surface and an outer circumferential surface.
- the first tips project forward from the free end surface of the cutter body.
- the second tips project outward from the outer circumferential surface of the cutter body.
- the recesses extend to a substantially central portion of the free end surface, and have a fan shape in a free end view of the tool body.
- the cutter body has a plurality of divisional surfaces defining each of the recesses.
- One of these divisional surfaces is provided thereon with not less than one first tip and not less than one second tip.
- the recesses constitute discharge flow passages for discharging the cutting chips producing during the grooving operation using the first and second tips.
- FIG. 1 is a longitudinal sectional view showing a valve assembly mounted fixedly on an object pipe in a first embodiment of the valve insertion method according to the present invention
- FIG. 2 is a horizontal sectional view of what is shown in FIG. 1;
- FIG. 3 is a partially sectioned side view showing a cutting apparatus
- FIG. 4( a ) is a side view showing a cutting tool
- FIGS. 4 ( b ) and 4 ( c ) are perspective views thereof;
- FIG. 5 is a longitudinal sectional view showing the condition of the embodiment with the grooving operation already completed
- FIG. 6 is a longitudinal sectional view showing the condition of the embodiment with the tool already removed
- FIG. 7 is a longitudinal sectional view showing the condition of the embodiment with the valve assembly already inserted and the gate opened;
- FIG. 8 is a horizontal sectional view showing a second embodiment of the valve insertion method in which a grooving operation is not yet carried out;
- FIG. 9 is a longitudinal sectional view of what is shown in FIG. 8;
- FIG. 10 is a longitudinal sectional view showing a valve assembly in a gate-closed condition
- FIG. 11( a ) is a perspective view showing a gate body
- FIG. 11( b ) is a perspective view showing a rubber packing
- FIG. 12( a ) is a schematic sectional view in plan showing the condition with the grooving operation already started
- FIG. 12( b ) is a horizontal sectional view of a gate taken along the line XIIb-XIIb
- FIG. 12( c ) is a sectional view of a gate taken along the line XIIc-XIIc shown in FIG. 12( d )
- FIG. 12( d ) is a front view showing the gate
- FIG. 13 is a perspective view showing the condition of the gate body on which the rubber packing is set;
- FIG. 14 is a horizontal sectional view showing the valve assembly in a gate-closed condition
- FIG. 15( a ) is a sectional view showing the condition of a conventional valve insertion method in which the grooving operation is not yet carried out
- FIG. 15( b ) is a sectional view showing the condition of the same method with the grooving operation already finished
- FIG. 16 is a sectional view showing another conventional valve insertion method.
- FIGS. 1 - 7 show a first embodiment.
- Valve Assembly 10
- a valve assembly 10 has a valve casing 2 , a gate 8 A and a valve spindle 8 C.
- the valve casing 2 forms a flow passage 1 B after a valve insertion work is completed, and is provided with first and second divisional cases 11 , 12 separated in the circumferential direction R of an already-installed pipe 1 , and a valve bonnet 2 b .
- the valve bonnet 2 b is fixed to the second divisional case 12 by assembling bolts 61 .
- the gate 8 A is housed in advance in the valve casing 2 .
- the valve spindle 8 C is adapted to slide the gate 8 A in a direction C which crosses the flow passage 1 B at right angles thereto.
- a clearance between the valve casing 2 and already-installed pipe 1 and that between the first and second divisional cases 11 , 12 shown in FIG. 2 are sealed with rubber packings 14 .
- a clearance between the valve bonnet 2 b and second divisional case 12 is sealed with a rubber ring 15 .
- the valve casing 2 is provided at both end portions thereof with packing insert portions 26 in which rubber rings (not shown) are forcibly inserted.
- the first divisional case 11 is provided with a first branch portion 11 b integral therewith.
- the first branch portion 11 b projects in a forking state from the first divisional case 11 in the radially outward direction C of the already-installed pipe 1 .
- the first branch portion 11 b forms a tool entering hole 51 opened into the center of the already-installed pipe 1 , and a milling type cutting tool 4 is passed through the first branch portion 11 b .
- An attachment 34 of a cutting apparatus 3 is fixed to the first branch portion 11 b via an operation gate valve (operation valve) 70 .
- the operation gate valve 70 is fixed to the first branch portion 11 b so that the former can open and close the tool entering hole 51 .
- the first branch portion 11 b has on the inner side thereof a female screw portion 11 a for screwing a plug 60 of FIG. 6 thereinto.
- the first branch portion 11 b is provided with a discharge hole 11 c for discharging cutting chips, which are produced during a grooving operation, with water therefrom.
- a discharge valve and a hose are joined as necessary to the discharge hole 11 c.
- the second divisional case 12 is provided with a second branch portion 12 b projecting in a forking state in the radially outward direction C of the already-installed pipe 1 .
- the valve bonnet 2 b is fixed to the second branch portion 12 b .
- the second branch portion 12 b and valve bonnet 2 b house a gate 8 A in the gate-opened condition, and form a gate housing hole 52 for allowing the gate 8 A to move slidingly therein.
- the gate housing hole 52 and tool entering hole 51 are provided in positions spaced from each other with respect to the axial direction S of the already-installed pipe 1 .
- the construction of the gate 8 A inserted into a line (conduit) 1 A will now be described.
- the gate 8 A is moved slidingly in the gate housing hole 52 in the radial direction C of the already-installed pipe 1 .
- the gate 8 A is provided with a gate body 8 a shown in FIG. 1.
- a water stopping rubber packing 8 d is fixed to the gate body 8 a .
- the rubber packing 8 d pressure contacts an inner circumferential surface of the valve casing 2 as shown by a two-dot chain line in FIG. 7, to prevent the leakage of water from the line 1 A.
- the cutting apparatus 3 of FIG. 3 has a cutter case 31 A fixed to the operation gate valve 70 (FIG. 1) via the attachment 34 .
- An elongated cutter shaft 32 is inserted through the interior of the cutter case 31 A and that of a gear case 31 B.
- the cutter shaft 32 is supported in an inner side of the cutter case 31 A and gear case 31 B via a first bearing 36 A and a bearing (not shown) so that the cutter shaft 32 can be rotated freely around an axis C 1 set in the radial direction C of the already-installed pipe 1 .
- the cutter shaft 32 is rotated by the power of an electric motor (an example of prime mover) 35 via a speed reducer (not shown) and a bevel gear (not shown)
- the cutter case 31 A is provided therein with a cutting screw 37 in parallel with the cutter shaft 32 .
- a handle 38 When a handle 38 is turned, the cutting screw 37 is rotated to positive and negative direction via bevel gears 39 A, 39 B.
- a female screw formed in a grip member 36 F is screwed with the cutting screw 37 .
- the grip member 36 F holds the cutter shaft 32 via a second bearing 36 B. Accordingly, when the handle 38 is turned, the cutting screw 37 is rotated to cause the grip member 36 F to move forward or backward, so that the cutter shaft 32 moves forward or backward.
- the cutter shaft 32 is provided at a free end portion thereof with a female thread 32 f for fixing the cutting tool 4 thereto.
- the cutting tool 4 has a substantially cylindrical tool body (cutter body) 43 adapted to be fixed by being screwed into the female thread 32 f (FIG. 3).
- the tool body 43 has a base end surface 46 , a free end surface 40 and an outer circumferential surface 41 .
- the tool body 43 is provided with two first tips 44 A, three second tips 44 B and two recesses 43 a.
- the first tips 44 A project forward (or toward the direction C 1 ) from the free end surface 40 of the tool body 43 and form cutting edges 42 on the free end surface 40 thereof, these cutting edges 42 are adapted to cut into the already-installed pipe 1 .
- the second tips 44 B project outward from the outer circumferential surface 41 of the tool body 43 and form cutting edges 42 on the outer circumferential surface 41 thereof, these cutting edges 42 are adapted to cut the already-installed pipe 1 .
- the recesses 43 a extend to a substantially central portion of the free end surface 40 , and have a fan shape when they are viewed from the side of the free end of the tool body 43 .
- the recess 43 a are formed so that the cross-sectional areas thereof become generally smaller from the free end surface 40 toward the base end surface 46 .
- the tool body 43 has a plurality of divisional surfaces 48 a , 48 b , 48 c , 48 d defining the recesses 43 a .
- the divisional surfaces 48 a - 48 d are formed so as to extend along the radial direction of the cutting tool 4 . Out of the divisional surfaces 48 a - 48 d , the first and second divisional surfaces 48 a , 48 b extend in the same diametrical direction.
- first tip 44 A and two second tips 44 B are fixed to the first divisional surface 48 a by male screws 45 .
- one each of the first and second tips 44 A, 44 B is fixed to the second divisional surface 42 b by male screws 45 respectively. Since the first and second tips 44 A, 44 B are thus fixed, they can be replaced when the cutting edges 42 are worn out.
- Each of the tips 44 A, 44 B is made preferably of a hard metal.
- the recesses 43 a form discharge flow passages for discharging cutting chips producing during a grooving operation carried out by the first and second tips 44 A, 44 B.
- the worker prepares the cutting apparatus 3 , the valve assembly 10 and the operation gate valve 70 .
- the worker fixes the valve casing 2 to a portion to be cut of the already-installed pipe 1 of FIG. 2 with a fluid (water) practically flowing therein, and assembles two divisional cases 11 , 12 together by assembling bolts 61 .
- the worker fixes the cutting apparatus 3 of FIG. 3 to the first branch portion 11 b , and fixes the valve bonnet 2 b , to which the gate 8 A and the valve spindle 8 C are fixed, to the second branch portion 12 b by assembling bolts 61 .
- the gate 8 A and cutting tool 4 are fixed to and housed in the valve casing 2 , and the valve casing 2 air-tightly encloses the mentioned part of the already-installed pipe 1 .
- the worker turns the valve casing 2 in the circumferential direction R of the pipe 1 of FIG. 2 with the cutting tool 4 making the cutting motions.
- the cutting tool 4 makes feeding motions, in which the cutting tool 4 with the valve casing 2 turns in the circumferential direction R of the already-installed pipe 1 , as the cutting tool 4 rotates around the set axis C 1 .
- the worker turns the cutting tool 4 , which is making feeding motions, around the whole circumference of the already-installed pipe 1 .
- the already-installed pipe 1 is cut annularly as shown in FIG. 5 without producing a cut-off section, to form a cut groove 12 C opened and extending in the whole circumference of the circumferential direction R of the pipe 1 .
- the cut groove 12 C forms a space in which the gate 8 A slidingly moves.
- cutting chips produces.
- the cutting chips are discharged with water to the outside of the valve casing 2 through the recesses 43 a of FIG. 4, the tool entering hole 51 , the discharge hole 11 c and a hose (not shown). Accordingly, not so many cutting chips enter the 21 interior of the already-installed pipe 1 .
- the cutting apparatus 3 is then removed by a method described below.
- the worker houses the cutting tool 4 in the cutter case 31 A (FIG. 3), and then closes the operation gate valve 70 by operating the working lever 71 therefor. The worker then removes the cutting apparatus 3 .
- the plug 60 of FIG. 6 is screwed into the female screw portion 11 a of the first branch portion 11 b by operating a known plug insertion means (not shown). After the plug 60 is screwed into the female screw portion 11 a , the worker removes the operation gate valve 70 and plug insertion means.
- FIGS. 8 - 14 show a second embodiment.
- Valve Assembly 10 [0117]
- a valve assembly 10 has a valve casing 200 , a gate 8 A and a valve spindle 8 C.
- the valve casing 200 forms after the completion of valve insertion work a flow passage 1 B in which water flows, and is provided with first and second divisional cases 110 , 120 separated from each other in the circumferential direction R of an already-installed pipe 1 and a valve bonnet 2 b .
- a valve bonnet 2 b is fixed to the second divisional case 120 by assembling bolts 61 .
- the gate 8 A is housed in advance in the valve casing 200 .
- the valve spindle 8 C is adapted to move slidingly the gate 8 A in the direction C crossing the already-installed pipe 1 at substantially right angles thereto.
- the second divisional case 120 is provided with a first and second branch portion 10 b , 120 b projecting outward in a forking state in the radial direction C of the already-installed pipe 1 .
- the first branch portion 110 b is formed diagonally with respect to the second branch portion 120 b so as to branch therefrom.
- the first branch portion 110 b forms a tool entering hole 51 opened toward the center of the already-installed pipe 1 , and a milling type cutting tool 4 passes through this first branch portion 110 b .
- An attachment 34 of a cutting apparatus 3 is fixed to the first branch portion 10 b via an operation gate valve (operation valve) 70 .
- the operation gate valve 70 is fixed to the first branch portion 110 b so that it can open and close the tool entering hole 51 .
- a clearance between the first branch portion 10 b and operation gate valve 70 , and a clearance between the operation gate valve 70 and attachment 34 are sealed with rubber rings (not shown).
- the first branch portion 10 b has therein a female screw portion 11 a into which a plug 60 of FIG. 14 is screwed.
- a valve bonnet 2 b is fixed to the second branch portion 120 b .
- the second branch portion 120 b and valve bonnet 2 b form a gate housing hole 52 housing the gate 8 A in the gate-opened condition.
- the gate housing hole 52 is opened in a flow passage 1 B to enable the gate 8 A to slidingly move in the radial direction C of the already-installed pipe 1 .
- a width W of the opening, which is on the side of a free end of the gate 8 A, of the gate housing hole 52 is set larger than an outer diameter D of the cutting tool 4 shown in FIG. 8.
- the gate 8 A inserted into the flow passage 1 B will now be described.
- the gate 8 A is slidingly moved in the gate housing hole 52 in the direction C which crosses the flow passage 1 B at substantially right angles thereto.
- the gate 8 A is made movable between a gate closing position P 1 in which the flow passage 1 B is closed and a gate opening position P 2 in which the gate is housed in the gate housing hole 52 .
- the valve spindle 8 C has a known piece 140 screwed thereon.
- the gate 8 A has a gate body 8 a , and a water leakage preventing rubber packing 8 d set on the gate body 8 a.
- the gate body 8 a is provided with mutually ranging first and second fitting grooves 121 , 122 .
- the first fitting groove 121 is formed in a front view in the shape of the letter “V” or “U” so as to extend from a lower end surface of the gate body 8 a to both ends thereof along a plane crossing the flow passage 1 B, which is shown by a two-dot-chain line, at substantially right angles thereto.
- a lower end portion 121 a of the first fitting groove 121 (as shown in FIG. 12( c ) and 12 ( d )) is formed arc shaped along an inner circumferential surface of the flow passage 1 B, and upper portions 121 b thereof are tapered so as to extend toward the diagonally upward direction.
- the second fitting groove 122 is joined to the upper end portions of the first fitting groove 121 as shown in FIG. 11( a ), and formed in the shape of a substantially elliptic ring (annularly) by connecting together the upper end portions of the two side surfaces 122 a , which cross the flow passage 1 B at substantially right angles thereto, of the gate body 8 a shown in FIGS. 12 ( a ) and ( d ).
- the second fitting groove 122 is formed in front view in the shape of an arc (arch) of a radius of curvature smaller than that of the inner circumferential surface of the flow passage 1 B.
- the rubber packing 8 d comprises a substantially V-shaped or U-shaped first packing portion 131 and a substantially elliptic (annular) second packing portion 132 which are molded integral each other.
- the first and second packing portions 131 , 132 have shapes in conformity with those of the first and second fitting grooves 121 , 122 respectively of FIG. 11( a ), and are fitted in these fitting grooves 121 , 122 as shown by an arrow and in FIG. 13.
- the cross-sectional shape of the rubber packing 8 d is substantially rectangular as shown in FIG. 9.
- valve spindle 8 C When the valve spindle 8 C is turned to negative direction, the gate 8 A is put in an gate-opened state as shown by a two-dot chain line in FIGS. 10 and 14.
- the gate 8 A slides from the cut groove 12 C formed by the cutting tool 4 into the already-installed pipe 1 .
- the first packing portion 131 Owing to the axial force of the valve spindle 8 C, the first packing portion 131 is pressed against the inner circumferential surface (inner wall surface) of the flow passage 1 B in the valve casing 200 , and the second packing portion 132 is pressed against side surfaces 117 in the second divisional case 120 , so that the gate 8 A is put in a gate-closed state as shown by solid lines.
- the side surfaces 117 are close to the flow passage 1 B in the gate housing hole 52 .
- the side surfaces 117 are tapered so that the gate housing hole 52 becomes narrower in the downward direction.
- the side surfaces 117 are formed along the second packing portion 132 of FIG. 13 so as to be opposed thereto.
- the gate body 8 a of the gate-closed state is attached and locked as shown in FIG. 12( b ) at side portions 123 of flow passage 1 B with locking grooves 180 of the gate housing hole 52 in the valve casing 200 .
- valve assembly 10 The construction of the remaining portions of the valve assembly 10 is identical with that of the corresponding portions of the first embodiment, and the identical or equivalent portions are designated by the same reference numerals, the detailed descriptions and illustrations thereof being omitted.
- the worker prepares the cutting apparatus 3 , the valve assembly 10 and the operation gate valve 70 .
- the worker fixes the valve casing 200 to a portion to be cut of the already-installed pipe 1 in which a fluid (water) practically flows, and assembles two divisional cases 110 , 120 together by assembling bolts 61 .
- the worker fixes the cutting apparatus 3 of FIG. 3 to the first branch portion 110 b , and fixes the valve bonnet 2 b , to which the gate 8 A and the valve spindle 8 C are fixed, to the second branch portion 120 b by assembling bolts 61 .
- the gate 8 A and the cutting tool 4 are housed in the valve casing 200 with the gate 8 A and the cutting tool 4 fixed thereto, whereby a part of the already-installed pipe 1 is enclosed air-tightly with the valve casing 200 .
- the cutting tool 4 advances by and by to a position in which a free end surface 40 passes through a part of a wall 1 a of the already-installed pipe 1 as shown by a two-dot-chain line in FIG. 8. Cutting into the pipe 1 with the cutting tool 4 is thus completed.
- the worker turns the valve casing 200 in the circumferential direction R of the already-installed pipe 1 of FIG. 8 with the cutting motions made by the cutting tool 4 .
- the cutting tool 4 makes feeding motions, in which the cutting tool 4 with the valve casing 200 turns in the circumferential direction R of the already-installed pipe 1 , as it rotates around the axis C 1 of FIG. 3.
- the worker turns the cutting tool 4 around the whole circumference of the already-installed pipe 1 with the cutting tool 4 kept making the feeding motions.
- the already-installed pipe 1 is thus cut annularly as shown by two-dot-chain lines in FIG. 10 without producing a cut-off section, to form a cut groove 12 C opened in the direction R of the range of the whole circumference thereof.
- the cut groove 12 C forms a space in which the gate 8 A slidingly moves.
- the worker houses the cutting tool 4 of FIG. 8 in the cutter case 31 A (FIG. 3), and then closes the operation gate valve 70 by operating a working lever 71 therefor. The worker then removes the cutting apparatus 3 . After the cutting apparatus 3 is removed, the worker operates a known plug insertion means (not shown) to screw the plug 60 of FIG. 14 into a female screw portion 11 a of the first branch portion 110 b . After this screwing operation is finished, the worker removes the operation gate valve 70 and plug insertion means. The valve insertion operation is thus completed.
- the gate 8 A is lowered to a lower end through the cut groove 12 C to stop the flow of the water.
- the prime mover for transmitting cutting motions to the cutting tool may comprise an engine besides a motor.
- the valve casing may be fixed to the cutting apparatus before the already-installed pipe is enclosed with therewith.
- the tool entering hole and cutting apparatus of FIG. 1 may be provided in and on either one of the first and second divisional cases.
- the cutting tool When the cutting tool is made to cut into the already-installed pipe, it is generally preferable that the cutting tool be fed toward substantially the diametrical center of the pipe as in each embodiment. According to the present invention, it is unnecessary to feed the cutting tool toward the center of the pipe, and it may be fed in the radial direction thereof.
- the valve casing may also be divided into three to four in the circumferential direction thereof.
- the gate may be inserted in any direction, i.e., from an upper or a side and a lower portion of the valve casing.
- the present invention can be applied not only to a water pipe but also to a gas pipe. Namely, a fluid flowing in an already-installed pipe comprising even a fluid other than water, such as an oil is also included in the scope of the present invention. An emergency shutoff valve may also be inserted according to the present invention.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Branch Pipes, Bends, And The Like (AREA)
- Valve Housings (AREA)
Abstract
A valve insertion method without stopping passage of fluid, wherein, first, a part of an already-installed pipe is enclosed air-tightly with a valve casing, a milling type cutting tool which has cutting edges on a free end surface and an outer circumferential surface thereof, and a gate being housed in the valve casing with the gate and the cutting tool fixed thereto. The gate and cutting tool are provided in positions spaced from each other in the axial direction of the already-installed pipe. A worker then feeds the cutting tool in the radial direction of the already-installed pipe as he has the cutting tool make cutting motions for cutting the pipe by the rotation of the cutting tool. The valve casing is then turned in the circumferential direction of the already-installed pipe as the cutting motions are kept made, whereby a cut groove cut in the direction of the range of the whole circumference of the pipe is formed. After the grooving operation is finished, the worker takes out the cutting tool from the valve casing, and then closes an operation valve. After the grooving operation is finished, the worker transfers the valve casing in the axial direction of the already-installed pipe, whereby the gate is transferred to a position which corresponds to that of the cut groove.
Description
- 1. Field of the Invention
- This invention relates to a valve insertion method without stopping passage of fluid, and a cutting tool.
- 2. Description of the Prior Art
- A valve insertion method comprising drilling a hole in an already-installed pipe (or existing pipe) in a non-water-flow-stopping state, and inserting a valve in the hole thus cut in the already-installed pipe in a line including the same pipe has heretofore been known.
- FIGS.15(a) and 15(b) shows an outline of a conventional valve insertion method disclosed in U.S. Pat. No. 4,516,598.
- According to the conventional techniques shown in these drawings, an already-installed
pipe 1 is enclosed with asealing case 800. The sealingcase 800 houses a hole saw 802 and agate 804 therein in advance. A circular opening is then drilled in the already-installedpipe 1 with thehole saw 802. After the opening is drilled, thesealing case 800 is turned as shown byarrows 850 in FIG. 15(a), and thegate 804 is thereafter inserted into thecircular opening 803 shown in FIG. 15(b). - The conventional techniques of FIGS.15(a), (b) enable the insertion of the valve after the completion of the pipe cut-off operation to be carried out speedily. However, in the conventional techniques of FIGS. 15(a), (b), the dimensions of the
sealing case 800 increase because it is necessary that the hole saw 802 having the dimensions of which are equal to those of thegate 804 to be inserted is housed in thesealing case 800. - FIG. 16 shows an outline of a conventional valve insertion method disclosed in U.S. Pat. No. 5,611,365 and International Patent Laid-Open WO97/31207.
- In the method shown in this drawing, an already-installed
pipe 1 is enclosed with asealing case 600 first. Agate 601 is then turned with thesealing case 600 to cut-off the already-installedpipe 1 with acutting tool 602 fixed to a free end of thegate 601. According to the conventional method described above, the dimensions of the sealingcase 600 decrease because thecutting tool 602 has small dimensions. However, since thecutting tool 602 is fixed to thegate 601, the leakage of water is not perfectly prevented. The already-installedpipe 1 is cut-off with a tiptype cutting tool 602. Therefore, in order to cut into an already-installedpipe 1 comprising a cast iron pipe or a steel pipe, thesealing case 600 has to be turned many times, so that it takes much time to cut-off the pipe. - U.S. Pat. No. 5,732,728 discloses a valve insertion method using an assembly provided with a rotary valve casing, a cutting assembly and a gate assembly. According to the conventional techniques, the gate assembly is fixed in place of the cutting assembly after a grooving operation is carried out, so that the dimensions of an apparatus decrease. However, in this prior art method, it is necessary to carry out an operation for replacing the cutting assembly with the gate assembly by opening and closing a seal means, so that the operations take much time.
- Therefore, a primary object of the present invention is to provide a valve insertion method capable of carrying out valve insertion work speedily and miniaturizing a sealing case.
- Another object of the present invention is to provide a cutting tool capable of improving a discharge rate of cutting chips producing in an operation for cutting an already-installed pipe (or existing pipe) in the valve insertion method. One aspect In one aspect of embodiment of the valve insertion method according to the present invention, a valve assembly is inserted in an already-installed line by using a milling type cutting tool, the valve assembly and an operation valve so as to achieve these objects.
- A worker prepares in advance the cutting tool, the valve assembly and the operation valve.
- The cutting tool is supported so that it can be rotated freely around an axis set in an axial direction of the already-installed pipe, and it has cutting edges on its free end surface and outer circumferential surface.
- The valve assembly has a valve casing forming a flow passage, a gate housed in the valve casing, and a valve spindle adapted to slide the gate in a direction which crosses the fluid passage at substantially right angles thereto.
- The valve casing is provided with a first and second divisional cases separated from each other in the circumferential direction of the already-installed pipe.
- Either one of these divisional cases is provided with a tool entering hole opened toward the center of the already-installed pipe.
- The second divisional case is provided with a gate housing hole adapted to house the gate therein when the valve is opened, and enable the gate to move slidingly.
- The gate housing hole and tool entering hole are provided in positions spaced from each other in the axial direction of the pipe.
- The operation valve is fixed to the valve casing so that it can open and close the tool entering hole.
- This valve insertion method has an assembling step, a drilling step, a grooving step, a tool takeout step and a transfer step which will be described below.
- In the assembling step, a part of the already-installed pipe is enclosed air-tightly with the valve casing, and the gate and the cutting tool, which is independent of the gate, are housed in the valve casing with the gate and the cutting tool fixed thereto.
- In the drilling step, the cutting tool is fed in the radial direction of the already-installed pipe as it is made to take cutting motions. The “cutting motions” referred to above means motions for cutting the already-installed pipe with the cutting tool rotated around the set axis mentioned above.
- In the grooving step, the valve casing is turned in the circumferential direction of the already-installed pipe with the cutting motions kept being made. Owing to the turning of the valve casing in this step, the cutting tool is turned in the circumferential direction of the already-installed pipe, whereby the cutting tool is made to take feeding motions. Consequently, the already-installed pipe is cut in the whole of a circumferentially extending portion thereof with the cutting tool without producing a cut-off section. Thus, a cut groove is formed (cut) in the portion of the already-installed pipe, and extends in the direction of the range of the whole circumference thereof.
- In the tool takeout step, the cutting tool is taken out from the valve casing via the operation valve after the completion of the grooving operation. Thereafter the operation valve is closed.
- In the transfer step, the valve casing is transferred in the axial direction of the already-installed pipe after the completion of the grooving operation, whereby the gate is transferred to a position corresponding to that of the cut groove.
- Another Aspect
- In another aspect of embodiment of the valve insertion method according to the present invention, a valve assembly is inserted in an already-installed line by using a milling type cutting tool, a valve assembly and an operation valve.
- A worker prepares in advance the cutting tool, the valve assembly and the operation valve.
- The cutting tool is supported so that it can be rotated freely around an axis set in an axial direction of the already-installed pipe, and it has cutting edges on its free end surface and outer circumferential surface.
- The valve assembly has a valve casing forming a flow passage, a gate housed in the valve casing, and a valve spindle adapted to slide the gate in a direction which crosses the fluid passage at substantially right angles thereto.
- The valve casing is provided with a first and second divisional cases separated from each other in the circumferential direction of the already-installed pipe.
- The second divisional case is provided with a gate housing hole, and a tool entering hole.
- The gate housing hole is adapted to house the gate therein when the gate is opened, and is opened in the flow passage to enable the gate to move slidingly.
- The tool entering hole is opened toward the center of the already-installed pipe diagonally with respect to the gate housing hole.
- The width of an opening, which is on the side of a free end of the gate, of the gate housing hole is set larger than the outer diameter of the cutting tool.
- The operation valve is fixed to the valve casing so that it can open and close the tool entering hole.
- This valve insertion method has an assembling step, a drilling step, a grooving step and a tool takeout step.
- In the assembling step, a part of the already-installed pipe is enclosed air-tightly with the valve casing, and the gate and the cutting tool, which is independent of the gate, are housed in the valve casing with the gate and the cutting tool fixed thereto.
- In the drilling step, the cutting tool is fed in the radial direction of the already-installed pipe by passing the cutting tool diagonally through a part of the gate housing hole as the cutting tool is made to take cutting motions. The “cutting motions” referred to above means motions for cutting the already-installed pipe with the cutting tool rotated around the set axis mentioned above.
- In the grooving step, the valve casing is turned in the circumferential direction of the already-installed pipe with the cutting motions kept being made. Owing to the turning of the valve casing in this step, the cutting tool is turned in the circumferential direction of the already-installed pipe, whereby the cutting tool is made to take feeding motions. Consequently, the already-installed pipe is cut in the whole of a circumferentially extending portion thereof with the cutting tool without producing a cut-off section. Thus, a cut groove is formed (cut) in the portion of the already-installed pipe, and extends in the direction of the range of the whole circumference thereof.
- In the tool takeout step, the cutting tool is taken out from the valve casing via the operation valve after the completion of the grooving operation. Thereafter the operation valve is closed.
- In the method according to the present invention, the already-installed pipe can be cut with the cutting tool rotated independently of the valve casing, so that even a cast iron pipe or a steel pipe can be cut in a short period of time.
- Since the gate is housed in the valve casing in advance, an upper working tank is not required. Moreover, since the groove is cut with a small cutting tool, the dimensions of the operation valve decrease. Accordingly, the dimensions of the valve assembly as a whole decrease.
- Since the gate and cutting tool are housed in the valve casing in advance, it is unnecessary to carry out an operation for replacing the cutting tool by the gate, so that the term of work decreases greatly.
- The “already-installed pipe” in the present invention means a pipe in which a fluid, such as water flows, and such a pipe is mostly buried in the ground.
- The “air-tightly enclosing” means sealing to such an extent that does not hinder the grooving (drilling and feeding) operation and the valve insertion operation carried out thereafter. For example, a method of discharging with water the cutting chips, which are produced during the grooving operation, from a water discharge hole provided in the valve casing and opened during the grooving operation may be employed.
- The “cutting tool” used in this valve insertion method is a milling type tool having a plurality of cutting edges in each of the free end surface and outer circumferential surface thereof, so that it does not include a bite and a cutter wheel.
- In order to cut an already-installed pipe having mortar lining on an inner surface thereof, a cutting tool provided with a plurality of tips made of a hard metal, or a cutting tool having the cutting edges of diamond particles are preferably used.
- The “cutting” referred to in the specification of the present invention means cutting a part of a pipe wall by rotating the cutting edges. The “feed motion” means causing the cutting tool to move to positions in which different parts of the pipe wall can be cut one after another with the cutting tool.
- The “inserting a valve assembly into an already-installed line” referred to in the specification of the present invention does not mean the physical insertion of a gate into a cut-off portion of an already-installed pipe but it means setting in an already-installed line (conduit) a valve assembly for preventing the leakage of water from and regulating a flow rate in the same line.
- The “valve assembly” above means an apparatus as a whole which includes a gate, a valve casing and a valve spindle.
- The “gate” means a member for closing a flow passage. The “valve casing” means a member housing the gate irrespective of the opened or closed condition of the gate.
- The cutting tool used in the present invention is suitable for cutting an already-installed pipe in a non-fluid-flow-stopping condition. This cutting tool is provided with a substantially cylindrical cutter body, a plurality of first tips, a plurality of second tips, and a plurality of recesses formed in the cutter body.
- The cutter body has a base end surface, a free end surface and an outer circumferential surface.
- The first tips project forward from the free end surface of the cutter body.
- The second tips project outward from the outer circumferential surface of the cutter body.
- The recesses extend to a substantially central portion of the free end surface, and have a fan shape in a free end view of the tool body.
- The cutter body has a plurality of divisional surfaces defining each of the recesses.
- These divisional surfaces are arranged in the radial direction of the cylindrical body.
- One of these divisional surfaces is provided thereon with not less than one first tip and not less than one second tip.
- Since the cutting tool is formed in this manner, the recesses constitute discharge flow passages for discharging the cutting chips producing during the grooving operation using the first and second tips.
- When an already-installed pipe is cut by rotating this cutting tool, a fluid in this pipe flows from the free end surface of the cutter body along the discharge flow passages, and is discharged from a discharge hole, whereby the cutting chips are discharged with the fluid. Accordingly, the entry of the cutting chips producing during the grooving operation into the same pipe can be restrained.
- The present invention will be understood more clearly from the following descriptions of the preferred embodiments included in the specification with reference to the accompanying drawings. The embodiments and drawings are prepared for illustrating and describing the invention. The scope of the present invention is defined on the basis of the claims. The same part numbers in a plurality of drawings among the accompanying drawings represent identical or equivalent parts.
- FIG. 1 is a longitudinal sectional view showing a valve assembly mounted fixedly on an object pipe in a first embodiment of the valve insertion method according to the present invention;
- FIG. 2 is a horizontal sectional view of what is shown in FIG. 1;
- FIG. 3 is a partially sectioned side view showing a cutting apparatus;
- FIG. 4(a) is a side view showing a cutting tool, and FIGS. 4(b) and 4(c) are perspective views thereof;
- FIG. 5 is a longitudinal sectional view showing the condition of the embodiment with the grooving operation already completed;
- FIG. 6 is a longitudinal sectional view showing the condition of the embodiment with the tool already removed,
- FIG. 7 is a longitudinal sectional view showing the condition of the embodiment with the valve assembly already inserted and the gate opened;
- FIG. 8 is a horizontal sectional view showing a second embodiment of the valve insertion method in which a grooving operation is not yet carried out;
- FIG. 9 is a longitudinal sectional view of what is shown in FIG. 8;
- FIG. 10 is a longitudinal sectional view showing a valve assembly in a gate-closed condition;
- FIG. 11(a) is a perspective view showing a gate body, and FIG. 11(b) is a perspective view showing a rubber packing;
- FIG. 12(a) is a schematic sectional view in plan showing the condition with the grooving operation already started, and FIG. 12(b) is a horizontal sectional view of a gate taken along the line XIIb-XIIb, FIG. 12(c) is a sectional view of a gate taken along the line XIIc-XIIc shown in FIG. 12(d), and FIG. 12(d) is a front view showing the gate;
- FIG. 13 is a perspective view showing the condition of the gate body on which the rubber packing is set;
- FIG. 14 is a horizontal sectional view showing the valve assembly in a gate-closed condition;
- FIG. 15(a) is a sectional view showing the condition of a conventional valve insertion method in which the grooving operation is not yet carried out, and FIG. 15(b) is a sectional view showing the condition of the same method with the grooving operation already finished; and
- FIG. 16 is a sectional view showing another conventional valve insertion method.
- The embodiments of the present invention will now be described with reference to the drawings.
- First Embodiment:
- FIGS.1-7 show a first embodiment.
- Valve Assembly10:
- As shown in FIGS. 1 and 2, a
valve assembly 10 has avalve casing 2, agate 8A and avalve spindle 8C. Thevalve casing 2 forms aflow passage 1B after a valve insertion work is completed, and is provided with first and seconddivisional cases pipe 1, and avalve bonnet 2 b. Thevalve bonnet 2 b is fixed to the seconddivisional case 12 by assemblingbolts 61. Thegate 8A is housed in advance in thevalve casing 2. Thevalve spindle 8C is adapted to slide thegate 8A in a direction C which crosses theflow passage 1B at right angles thereto. - A clearance between the
valve casing 2 and already-installedpipe 1 and that between the first and seconddivisional cases rubber packings 14. A clearance between thevalve bonnet 2 b and seconddivisional case 12 is sealed with arubber ring 15. Thevalve casing 2 is provided at both end portions thereof with packinginsert portions 26 in which rubber rings (not shown) are forcibly inserted. - The first
divisional case 11 is provided with afirst branch portion 11 b integral therewith. Thefirst branch portion 11 b projects in a forking state from the firstdivisional case 11 in the radially outward direction C of the already-installedpipe 1. Thefirst branch portion 11 b forms atool entering hole 51 opened into the center of the already-installedpipe 1, and a millingtype cutting tool 4 is passed through thefirst branch portion 11 b. Anattachment 34 of acutting apparatus 3 is fixed to thefirst branch portion 11 b via an operation gate valve (operation valve) 70. Theoperation gate valve 70 is fixed to thefirst branch portion 11 b so that the former can open and close thetool entering hole 51. A clearance between thefirst branch portion 11 b andoperation gate valve 70 and that between theoperation gate valve 70 andattachment 34 are sealed with rubber rings (not shown). Thefirst branch portion 11 b has on the inner side thereof afemale screw portion 11 a for screwing aplug 60 of FIG. 6 thereinto. Thefirst branch portion 11 b is provided with adischarge hole 11 c for discharging cutting chips, which are produced during a grooving operation, with water therefrom. A discharge valve and a hose are joined as necessary to thedischarge hole 11 c. - The second
divisional case 12 is provided with asecond branch portion 12 b projecting in a forking state in the radially outward direction C of the already-installedpipe 1. Thevalve bonnet 2 b is fixed to thesecond branch portion 12 b. Thesecond branch portion 12 b andvalve bonnet 2 b house agate 8A in the gate-opened condition, and form agate housing hole 52 for allowing thegate 8A to move slidingly therein. - The
gate housing hole 52 andtool entering hole 51 are provided in positions spaced from each other with respect to the axial direction S of the already-installedpipe 1. -
Gate 8A: - The construction of the
gate 8A inserted into a line (conduit) 1A will now be described. When thevalve spindle 8C is rotated to positive and negative direction, thegate 8A is moved slidingly in thegate housing hole 52 in the radial direction C of the already-installedpipe 1. Thegate 8A is provided with agate body 8 a shown in FIG. 1. A water stopping rubber packing 8 d is fixed to thegate body 8 a. When thegate body 8 a descends through acut groove 12C, which is cut with thecutting tool 4, to a lower end thereof, the rubber packing 8 d pressure contacts an inner circumferential surface of thevalve casing 2 as shown by a two-dot chain line in FIG. 7, to prevent the leakage of water from theline 1A. - Cutting Apparatus3:
- The
cutting apparatus 3 of FIG. 3 has a cutter case 31A fixed to the operation gate valve 70 (FIG. 1) via theattachment 34. Anelongated cutter shaft 32 is inserted through the interior of the cutter case 31A and that of a gear case 31B. Thecutter shaft 32 is supported in an inner side of the cutter case 31A and gear case 31B via a first bearing 36A and a bearing (not shown) so that thecutter shaft 32 can be rotated freely around an axis C1 set in the radial direction C of the already-installedpipe 1. Thecutter shaft 32 is rotated by the power of an electric motor (an example of prime mover) 35 via a speed reducer (not shown) and a bevel gear (not shown) The cutter case 31A is provided therein with a cuttingscrew 37 in parallel with thecutter shaft 32. When a handle 38 is turned, the cuttingscrew 37 is rotated to positive and negative direction via bevel gears 39A, 39B. A female screw formed in a grip member 36F is screwed with the cuttingscrew 37. The grip member 36F holds thecutter shaft 32 via a second bearing 36B. Accordingly, when the handle 38 is turned, the cuttingscrew 37 is rotated to cause the grip member 36F to move forward or backward, so that thecutter shaft 32 moves forward or backward. - The
cutter shaft 32 is provided at a free end portion thereof with a female thread 32 f for fixing thecutting tool 4 thereto. - Cutting Tool4:
- The
cutting tool 4 will now be described by using FIGS. 4(a), (b) and (c). - The
cutting tool 4 has a substantially cylindrical tool body (cutter body) 43 adapted to be fixed by being screwed into the female thread 32 f (FIG. 3). Thetool body 43 has abase end surface 46, afree end surface 40 and an outercircumferential surface 41. Thetool body 43 is provided with twofirst tips 44A, threesecond tips 44B and tworecesses 43 a. - The
first tips 44A project forward (or toward the direction C1) from thefree end surface 40 of thetool body 43 andform cutting edges 42 on thefree end surface 40 thereof, these cuttingedges 42 are adapted to cut into the already-installedpipe 1. Thesecond tips 44B project outward from the outercircumferential surface 41 of thetool body 43 andform cutting edges 42 on the outercircumferential surface 41 thereof, these cuttingedges 42 are adapted to cut the already-installedpipe 1. - The
recesses 43 a extend to a substantially central portion of thefree end surface 40, and have a fan shape when they are viewed from the side of the free end of thetool body 43. Therecess 43 a are formed so that the cross-sectional areas thereof become generally smaller from thefree end surface 40 toward thebase end surface 46. Thetool body 43 has a plurality ofdivisional surfaces recesses 43 a. The divisional surfaces 48 a-48 d are formed so as to extend along the radial direction of thecutting tool 4. Out of the divisional surfaces 48 a-48 d, the first and seconddivisional surfaces - As shown in FIG. 4(b), one
first tip 44A and twosecond tips 44B are fixed to the firstdivisional surface 48 a bymale screws 45. As shown in FIG. 4(c), one each of the first andsecond tips male screws 45 respectively. Since the first andsecond tips tips - Owing to such construction of the
cutting tool 4, therecesses 43 a form discharge flow passages for discharging cutting chips producing during a grooving operation carried out by the first andsecond tips - Assembling Step:
- The procedure for the insertion method of the
gate 8A will now be described. - First, the worker prepares the
cutting apparatus 3, thevalve assembly 10 and theoperation gate valve 70. The worker then fixes thevalve casing 2 to a portion to be cut of the already-installedpipe 1 of FIG. 2 with a fluid (water) practically flowing therein, and assembles twodivisional cases bolts 61. The worker then fixes thecutting apparatus 3 of FIG. 3 to thefirst branch portion 11 b, and fixes thevalve bonnet 2 b, to which thegate 8A and thevalve spindle 8C are fixed, to thesecond branch portion 12 b by assemblingbolts 61. Thus, as shown in FIG. 1, thegate 8A and cuttingtool 4 are fixed to and housed in thevalve casing 2, and the valve casing 2 air-tightly encloses the mentioned part of the already-installedpipe 1. - Drilling Step:
- When the worker then drives the
electric motor 35 of thecutting apparatus 3, theelectric motor 35 rotates thecutting tool 4 with thecutter shaft 32 to have thecutting tool 4 make cutting motions for cutting the already-installedpipe 1 in accordance with the rotation thereof. When the worker feeds thecutting tool 4 in the radial direction C of thepipe 1 by operating thecutting apparatus 3 with the cutting motions made by thecutting tool 4, thefree end surface 40 of thecutting tool 4 advances to a position in which thefree end surface 40 thrusts into a part of awall 1 a of the already-installedpipe 1. Thus, the cutting of thecutting tool 4 into thewall 1 a of the already-installedpipe 1 is completed. - Grooving Step:
- After the
cutting tool 4 cuts into thewall 1 a of the already-installedpipe 1, the worker turns thevalve casing 2 in the circumferential direction R of thepipe 1 of FIG. 2 with thecutting tool 4 making the cutting motions. Namely, thecutting tool 4 makes feeding motions, in which thecutting tool 4 with thevalve casing 2 turns in the circumferential direction R of the already-installedpipe 1, as thecutting tool 4 rotates around the set axis C1. Thus, the worker turns thecutting tool 4, which is making feeding motions, around the whole circumference of the already-installedpipe 1. Thus, the already-installedpipe 1 is cut annularly as shown in FIG. 5 without producing a cut-off section, to form acut groove 12C opened and extending in the whole circumference of the circumferential direction R of thepipe 1. Thecut groove 12C forms a space in which thegate 8A slidingly moves. - In the drilling step and grooving step, cutting chips produces. The cutting chips are discharged with water to the outside of the
valve casing 2 through therecesses 43 a of FIG. 4, thetool entering hole 51, thedischarge hole 11 c and a hose (not shown). Accordingly, not so many cutting chips enter the 21 interior of the already-installedpipe 1. - Tool Takeout Step:
- The
cutting apparatus 3 is then removed by a method described below. - After the
cut groove 12C is formed, the worker houses the cuttingtool 4 in the cutter case 31A (FIG. 3), and then closes theoperation gate valve 70 by operating the workinglever 71 therefor. The worker then removes thecutting apparatus 3. After thecutting apparatus 3 is removed, theplug 60 of FIG. 6 is screwed into thefemale screw portion 11 a of thefirst branch portion 11 b by operating a known plug insertion means (not shown). After theplug 60 is screwed into thefemale screw portion 11 a, the worker removes theoperation gate valve 70 and plug insertion means. - Transfer Step:
- After the tool takeout step is carried out, the worker transfers the
valve casing 2 in the axial direction S of the already-installedpipe 1 to set the position of thegate 8A corresponding to that of thecut groove 12C as shown in FIG. 7. Thus, the valve insertion work is completed to obtain a pipe structure of FIG. 7. - Second Embodiment:
- FIGS.8-14 show a second embodiment.
- Valve Assembly10:
- As shown in FIGS. 8 and 9, a
valve assembly 10 has avalve casing 200, agate 8A and avalve spindle 8C. Thevalve casing 200 forms after the completion of valve insertion work aflow passage 1B in which water flows, and is provided with first and seconddivisional cases pipe 1 and a valve bonnet2 b. Avalve bonnet 2 b is fixed to the seconddivisional case 120 by assemblingbolts 61. Thegate 8A is housed in advance in thevalve casing 200. Thevalve spindle 8C is adapted to move slidingly thegate 8A in the direction C crossing the already-installedpipe 1 at substantially right angles thereto. - As shown in FIG. 8, a clearance between the
valve bonnet 2 b and seconddivisional case 120, and a clearance between the first and seconddivisional cases rubber packings 14. - The second
divisional case 120 is provided with a first andsecond branch portion 10 b, 120 b projecting outward in a forking state in the radial direction C of the already-installedpipe 1. Thefirst branch portion 110 b is formed diagonally with respect to thesecond branch portion 120 b so as to branch therefrom. - The
first branch portion 110 b forms atool entering hole 51 opened toward the center of the already-installedpipe 1, and a millingtype cutting tool 4 passes through thisfirst branch portion 110 b. Anattachment 34 of acutting apparatus 3 is fixed to the first branch portion 10 b via an operation gate valve (operation valve) 70. Theoperation gate valve 70 is fixed to thefirst branch portion 110 b so that it can open and close thetool entering hole 51. A clearance between the first branch portion 10 b andoperation gate valve 70, and a clearance between theoperation gate valve 70 andattachment 34 are sealed with rubber rings (not shown). The first branch portion 10 b has therein afemale screw portion 11 a into which aplug 60 of FIG. 14 is screwed. - A
valve bonnet 2 b is fixed to thesecond branch portion 120 b. Thesecond branch portion 120 b andvalve bonnet 2 b form agate housing hole 52 housing thegate 8A in the gate-opened condition. Thegate housing hole 52 is opened in aflow passage 1B to enable thegate 8A to slidingly move in the radial direction C of the already-installedpipe 1. A width W of the opening, which is on the side of a free end of thegate 8A, of thegate housing hole 52 is set larger than an outer diameter D of thecutting tool 4 shown in FIG. 8. -
Gate 8A: - The construction of the
gate 8A inserted into theflow passage 1B will now be described. As shown in FIG. 10, when thevalve spindle 8C is rotated to positive and negative direction, thegate 8A is slidingly moved in thegate housing hole 52 in the direction C which crosses theflow passage 1B at substantially right angles thereto. Namely, thegate 8A is made movable between a gate closing position P1 in which theflow passage 1B is closed and a gate opening position P2 in which the gate is housed in thegate housing hole 52. Thevalve spindle 8C has a knownpiece 140 screwed thereon. - As shown in FIGS.11(a) and (b), the
gate 8A has agate body 8 a, and a water leakage preventing rubber packing 8 d set on thegate body 8 a. - As shown in FIG. 11(a), the
gate body 8 a is provided with mutually ranging first and secondfitting grooves fitting groove 121 is formed in a front view in the shape of the letter “V” or “U” so as to extend from a lower end surface of thegate body 8 a to both ends thereof along a plane crossing theflow passage 1B, which is shown by a two-dot-chain line, at substantially right angles thereto. Especially, in this embodiment, alower end portion 121 a of the first fitting groove 121 (as shown in FIG. 12(c) and 12(d)) is formed arc shaped along an inner circumferential surface of theflow passage 1B, andupper portions 121 b thereof are tapered so as to extend toward the diagonally upward direction. - The second
fitting groove 122 is joined to the upper end portions of the firstfitting groove 121 as shown in FIG. 11(a), and formed in the shape of a substantially elliptic ring (annularly) by connecting together the upper end portions of the twoside surfaces 122 a, which cross theflow passage 1B at substantially right angles thereto, of thegate body 8 a shown in FIGS. 12(a) and (d). As shown in FIG. 12(d), the secondfitting groove 122 is formed in front view in the shape of an arc (arch) of a radius of curvature smaller than that of the inner circumferential surface of theflow passage 1B. - As shown in FIG. 11(b), the rubber packing 8 d comprises a substantially V-shaped or U-shaped
first packing portion 131 and a substantially elliptic (annular)second packing portion 132 which are molded integral each other. The first andsecond packing portions fitting grooves fitting grooves - When the
valve spindle 8C is turned to negative direction, thegate 8A is put in an gate-opened state as shown by a two-dot chain line in FIGS. 10 and 14. When thevalve spindle 8C is turned to positive direction, thegate 8A slides from thecut groove 12C formed by thecutting tool 4 into the already-installedpipe 1. Owing to the axial force of thevalve spindle 8C, thefirst packing portion 131 is pressed against the inner circumferential surface (inner wall surface) of theflow passage 1B in thevalve casing 200, and thesecond packing portion 132 is pressed against side surfaces 117 in the seconddivisional case 120, so that thegate 8A is put in a gate-closed state as shown by solid lines. The side surfaces 117 are close to theflow passage 1B in thegate housing hole 52. The side surfaces 117 are tapered so that thegate housing hole 52 becomes narrower in the downward direction. The side surfaces 117 are formed along thesecond packing portion 132 of FIG. 13 so as to be opposed thereto. - In this embodiment, the
gate body 8 a of the gate-closed state is attached and locked as shown in FIG. 12(b) atside portions 123 offlow passage 1B with lockinggrooves 180 of thegate housing hole 52 in thevalve casing 200. - The construction of the remaining portions of the
valve assembly 10 is identical with that of the corresponding portions of the first embodiment, and the identical or equivalent portions are designated by the same reference numerals, the detailed descriptions and illustrations thereof being omitted. - Assembling Step:
- The procedure for a
gate 8A insertion method will now be described. - First, the worker prepares the
cutting apparatus 3, thevalve assembly 10 and theoperation gate valve 70. The worker then fixes thevalve casing 200 to a portion to be cut of the already-installedpipe 1 in which a fluid (water) practically flows, and assembles twodivisional cases bolts 61. The worker then fixes thecutting apparatus 3 of FIG. 3 to thefirst branch portion 110 b, and fixes thevalve bonnet 2 b, to which thegate 8A and thevalve spindle 8C are fixed, to thesecond branch portion 120 b by assemblingbolts 61. Thus, as shown in FIGS. 8 and 9, thegate 8A and thecutting tool 4 are housed in thevalve casing 200 with thegate 8A and thecutting tool 4 fixed thereto, whereby a part of the already-installedpipe 1 is enclosed air-tightly with thevalve casing 200. - Drilling Step:
- When the worker then drives the
electric motor 35 of thecutting apparatus 3 of FIG. 3, thecutting tool 4 is rotated with acutter shaft 32, and the rotation of thecutting tool 4 causes thecutting tool 4 to make cutting motions for cutting the already-installedpipe 1. When the worker feeds thecutting tool 4, which is in practical cutting motions in accordance with operating thecutting apparatus 3, in a cutting direction C2 by diagonally passing the same through a part of thegate housing hole 52 as shown by two-dot chain lines in FIG. 12(a), thecutting tool 4 advances by and by to a position in which afree end surface 40 passes through a part of awall 1 a of the already-installedpipe 1 as shown by a two-dot-chain line in FIG. 8. Cutting into thepipe 1 with thecutting tool 4 is thus completed. - Grooving Step:
- After the
cutting tool 4 cuts into the already-installedpipe 1, the worker turns thevalve casing 200 in the circumferential direction R of the already-installedpipe 1 of FIG. 8 with the cutting motions made by thecutting tool 4. Namely, thecutting tool 4 makes feeding motions, in which thecutting tool 4 with thevalve casing 200 turns in the circumferential direction R of the already-installedpipe 1, as it rotates around the axis C1 of FIG. 3. Thus, the worker turns thecutting tool 4 around the whole circumference of the already-installedpipe 1 with thecutting tool 4 kept making the feeding motions. The already-installedpipe 1 is thus cut annularly as shown by two-dot-chain lines in FIG. 10 without producing a cut-off section, to form acut groove 12C opened in the direction R of the range of the whole circumference thereof. Thecut groove 12C forms a space in which thegate 8A slidingly moves. - Tool Takeout Step:
- The
cutting apparatus 3 is then removed by a method which will now be described. - After the
cut groove 12C is formed, the worker houses the cuttingtool 4 of FIG. 8 in the cutter case 31A (FIG. 3), and then closes theoperation gate valve 70 by operating a workinglever 71 therefor. The worker then removes thecutting apparatus 3. After thecutting apparatus 3 is removed, the worker operates a known plug insertion means (not shown) to screw theplug 60 of FIG. 14 into afemale screw portion 11 a of thefirst branch portion 110 b. After this screwing operation is finished, the worker removes theoperation gate valve 70 and plug insertion means. The valve insertion operation is thus completed. - After the valve insertion work is completed, the
gate 8A is lowered to a lower end through the cut groove 12C to stop the flow of the water. - As in the above paragraphs, the preferred embodiments have been described with reference to the drawings. A person skilled in the art will easily imagine various alterations and modifications within an obvious scope of the invention with reference to this specification.
- For example, the prime mover for transmitting cutting motions to the cutting tool may comprise an engine besides a motor. The valve casing may be fixed to the cutting apparatus before the already-installed pipe is enclosed with therewith. The tool entering hole and cutting apparatus of FIG. 1 may be provided in and on either one of the first and second divisional cases.
- When the cutting tool is made to cut into the already-installed pipe, it is generally preferable that the cutting tool be fed toward substantially the diametrical center of the pipe as in each embodiment. According to the present invention, it is unnecessary to feed the cutting tool toward the center of the pipe, and it may be fed in the radial direction thereof.
- The valve casing may also be divided into three to four in the circumferential direction thereof. The gate may be inserted in any direction, i.e., from an upper or a side and a lower portion of the valve casing.
- The present invention can be applied not only to a water pipe but also to a gas pipe. Namely, a fluid flowing in an already-installed pipe comprising even a fluid other than water, such as an oil is also included in the scope of the present invention. An emergency shutoff valve may also be inserted according to the present invention.
- Therefore, such alterations and modifications are construed as matters within the scope of the present invention.
Claims (8)
1. A valve insertion method for inserting a valve assembly into an already-installed line in non-fluid-flow-stopping condition by using a milling type cutting tool, a valve assembly and an operation valve, wherein:
said cutting tool, said valve assembly and said operation valve are prepared in advance,
said cutting tool being supported rotatably around an axis set in the radial direction of an already-installed pipe, and having cutting edges on a free end surface and an outer circumferential surface thereof,
said valve assembly having a valve casing forming a flow passage, a gate housed in said valve casing, and a valve spindle adapted to slide said gate in the direction crossing said flow passage at substantially right angles thereto,
said valve casing being provided with first and second divisional cases separated from each other in the circumferential direction of said already-installed pipe,
either one of said divisional cases being provided with a tool entering hole opened toward the center of said already-installed pipe,
said second divisional case being provided with a gate housing hole which is adapted to house said gate when said gate is opened, and which allows said gate to move slidingly therein,
said gate housing hole and said tool entering hole being provided in positions spaced from each other in the axial direction of said already-installed pipe,
said operation valve being fixed to said valve casing so that said operation valve can open and close said tool entering hole,
said valve insertion method being provided with an assembling step, a drilling step, a grooving step, a tool takeout step and a transfer step,
in said assembling step, apart of said already-installed pipe being enclosed air-tightly with said valve casing, and said gate and said cutting tool provided separately from said gate being housed in said valve casing with said gate and said cutting tool fixed thereto,
in said drilling step, said cutting tool being fed in the radial direction of said already-installed pipe as said cutting tool is rotated around said set axis to have said cutting tool make cutting motions for cutting said already-installed pipe by rotations of said cutting tool,
in said grooving step, said valve casing being turned in the circumferential direction of said already-installed pipe as said cutting motions are kept made, whereby said cutting tool is turned in said circumferential direction to have said cutting tool make feeding motions, this causing said already-installed pipe to be cut without producing a cut-off section in the direction of the range of the whole circumference thereof to form a cut groove in the direction of the range of the whole circumference of said already-installed pipe,
in said tool takeout step, said cutting tool being taken out from said valve casing via said operation valve after the grooving operation is finished,
in said transfer step, said valve casing being transferred in the axial direction of said already-installed pipe after the completion of said grooving operation, whereby said gate is transferred to a position corresponding to that of said cut groove.
2. The valve insertion method according to , wherein said gate has a gate body, and a water leakage preventing rubber packing fixed to said gate body.
claim 1
3. A valve insertion method for inserting a valve assembly into an already-installed line in non-fluid-flow-stopping condition by using a milling type cutting tool, a valve assembly and an operation valve, wherein:
said cutting tool, said valve assembly and said operation valve are prepared in advance,
said cutting tool being supported rotatably around an axis set in the radial direction of an already-installed pipe, and having cutting edges on a free end surface and an outer circumferential surface thereof,
said valve assembly having a valve casing forming a flow passage, a gate housed in said valve casing, and a valve spindle adapted to slide said gate in the direction crossing said flow passage at substantially right angles thereto,
said valve casing being provided with first and second divisional cases separated from each other in the circumferential direction of said already-installed pipe,
said second divisional case being provided with a gate housing hole and a tool entering hole,
said gate housing hole housing said gate when said gate is opened, and opening in said flow passage to enable said gate to slidingly move,
said tool entering hole extending toward the center of said already-installed pipe and opening diagonally with respect to said gate housing hole,
a width of an opening, which is on the side of a free end of said gate, of said gate housing hole being set larger than an outer diameter of said cutting tool,
said operation valve being fixed to said valve casing so that said operation valve can open and close said tool entering hole,
said valve insertion method being provided with an assembling step, a drilling step, a grooving step and a tool takeout step,
in said assembling step, a part of said already-installed pipe being enclosed air-tightly with said valve casing, and said gate and said cutting tool provided separately from said gate being housed in said valve casing with said gate and said cutting tool fixed thereto,
in said drilling step, said cutting tool being fed in the radial direction of said already-installed pipe by passing said cutting tool diagonally through a part of said gate housing hole as said cutting tool is rotated around said set axis to have said cutting tool make cutting motions for cutting said already-installed pipe by rotations of said cutting tool,
in said grooving step, said valve casing being turned in the circumferential direction of said already-installed pipe as said cutting motions are kept made, whereby said cutting tool is turned in said circumferential direction to have said cutting tool make feeding motions, this causing said already-installed pipe to be cut without producing a cut-off section in the direction of the range of the whole circumference thereof to form a cut groove in the direction of the range of the whole circumference of said already-installed pipe,
in said tool takeout step, said cutting tool being taken out from said valve casing via said operation valve after the grooving operation is finished.
4. The valve insertion method according to , wherein said gate has a gate body, and a water leakage preventing rubber packing fixed to said gate body.
claim 3
5. The valve insertion method according to , wherein said rubber packing comprises a substantially V-shaped or U-shaped first packing portion, and a annular second packing portion integrally molded with said first packing portion,
claim 4
said first packing portion extending from a lower end of said gate body to both side ends thereof along a plane crossing said flow passage at substantially right angles thereto, and formed substantially in the shape of the letter “V” or “U”,
said second packing portion being joined to an upper end section of said first packing portion, and pressed against side surfaces of said gate housing hole in said second divisional case.
6. A cutting tool suitable for cutting an already-installed pipe in non-fluid-flow-stopping condition, comprising:
a substantially cylindrical cutter body having a base end surface, a free end surface and an outer circumferential surface,
a plurality of first tips projecting forward from said free end surface of said cutter body,
a plurality of second tips projecting outward from said outer circumferential surface of said cutter body, and
a plurality of recesses formed in said cutter body, wherein:
said recesses extending to a substantially central portion of said free end surface, and having a shape of fan when said recesses are viewed from said free end surface,
said cutter body having a plurality of divisional surfaces defining each of said recesses,
each of said divisional surfaces being arranged so as to extend in the radial direction of said cylindrical body,
not less than one first tip and not less than one second tip being fixed to one of said divisional surfaces,
owing to such construction, said recesses forming discharge flow passages for discharging cutting chips producing due to a grooving operation using said first and second tips.
7. The cutting tool according to , wherein said recesses are generally formed so that a cross-sections thereof become smaller from said free end surface toward said base end surface of said cutter body.
claim 6
8. The cutting tool according to , wherein each of said tips is fixed to said divisional surface by male screw.
claim 6
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US09/821,156 US6308726B2 (en) | 1999-12-15 | 2001-03-30 | Valve insertion method and cutting tool |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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US09/460,971 US6357471B1 (en) | 1999-12-15 | 1999-12-15 | Valve insertion method and cutting tool |
US09/821,156 US6308726B2 (en) | 1999-12-15 | 2001-03-30 | Valve insertion method and cutting tool |
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US09/460,971 Division US6357471B1 (en) | 1999-12-15 | 1999-12-15 | Valve insertion method and cutting tool |
Publications (2)
Publication Number | Publication Date |
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US20010010233A1 true US20010010233A1 (en) | 2001-08-02 |
US6308726B2 US6308726B2 (en) | 2001-10-30 |
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US09/460,971 Expired - Lifetime US6357471B1 (en) | 1999-12-15 | 1999-12-15 | Valve insertion method and cutting tool |
US09/821,156 Expired - Lifetime US6308726B2 (en) | 1999-12-15 | 2001-03-30 | Valve insertion method and cutting tool |
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US09/460,971 Expired - Lifetime US6357471B1 (en) | 1999-12-15 | 1999-12-15 | Valve insertion method and cutting tool |
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US6308726B2 (en) | 2001-10-30 |
US6357471B1 (en) | 2002-03-19 |
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