JP4548641B2 - Method and apparatus for cutting existing fluid pipe - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cutting method and apparatus for an existing fluid pipe that cuts an existing fluid pipe such as a water pipe or a gas pipe without blocking the flow of an internal fluid.
[0002]
[Prior art]
Conventionally, fluid pipes buried in the ground are often subjected to stress in the direction perpendicular to the pipe or the axis of the pipe due to relative displacement of the ground due to earthquakes or ground subsidence, etc., and the stress exceeded the allowable limit. In some cases, the pipe may come out of the joint or cause a damage accident.
[0003]
In order to prevent such an accident, it is effective to attach an expansion / contraction flexible pipe joint to an existing fluid pipe. As a general method of attaching this pipe joint in an uninterrupted state without stopping the flow of fluid in the fluid pipe, for example, there is the following method.
[0004]
That is, a sealed case is attached in a watertight manner around the flow tube body, and after the fluid pipe is cut into a ring shape by a cutting machine in this case, the cut piece is removed from the sealed case together with the cutting machine, and is stretchable and flexible. The joint is inserted into the sealed case, fitted into the cut portion of the fluid pipe, and finally the inside of the sealed case is removed from the flow tube body.
[0005]
The above-described method using the expansion and contraction flexibility of the flow tube body requires a work of attaching a large sealed case to the fluid pipe or removing it after the work is completed, and thus the work is complicated and the pipe When the diameter is large, it is necessary to use a heavy machine such as a crane. Therefore, there is a problem that the work becomes large, and the man-hours and the work cost increase.
[0006]
In addition, a cutting device having a cylindrical cutter with a larger outer diameter is used for cutting the fluid pipe. Therefore, if the pipe diameter is large, the cutting device is inevitably increased in size and attached or removed. Work becomes complicated.
[0007]
Therefore, in order to solve the above-mentioned problems, the applicant of the present application can easily cut and fluidize a fluid pipe without using a large-sized cutting device equipped with a large-sized sealed case or a cylindrical cutter. A method has been devised and a patent application has been filed earlier (see Japanese Patent Application No. 11-119943).
[0008]
[Problems to be solved by the invention]
However, the following problems to be solved remain in the prior application described above. That is, since the cutting device is rotated around the outer periphery of the casing itself attached to the fluid pipe via the packing to cut the existing fluid pipe, the cutting device is misaligned or inclined with respect to the outer peripheral surface of the casing. If this occurs, there is a risk that the packing may be damaged, and there is a problem that greatly affects the cutting accuracy of the existing fluid pipe.
[0009]
Further, if the outer peripheral surface of the fluid pipe is uneven due to corrosion or the like, the watertightness due to packing cannot be maintained, so the outer peripheral surface needs to be repaired to a smooth surface, which is troublesome.
[0010]
The present invention has been made in view of the above problems, and can easily cut the fluid pipe without using a large sealed case or cutting device, and can damage the packing between the fluid pipe and the housing. It is an object of the present invention to provide a method and apparatus for cutting an existing fluid pipe that does not repair the outer peripheral surface of the fluid pipe and can improve the cutting accuracy of the existing fluid pipe.
[0011]
[Means for Solving the Problems]
In order to achieve the above object, the method for cutting an existing fluid pipe according to the present invention is based on a split structure in which the required dimension is spaced apart in the pipe axis direction on the outer circumferences on both sides sandwiching a predetermined cutting position preset in the existing fluid pipe. After a pair of cylindrical casings are mounted in a watertight manner, the rotation sleeves that are externally fitted in a sealed manner are controlled by rotating the outer peripheral surfaces of the opposite ends of both casings in a tube axis direction. This is a method of cutting an existing fluid pipe that cuts the middle part of the fluid pipe surrounded by both housings by feeding a cutting tool inserted through at least a part of the outer peripheral surface of the work hole toward the center of the fluid pipe. And
A supporting body is mounted on both sides of the rotating sleeve in the axial direction of the tube so as to cooperate with the rotating sleeve, and a radial anti-vibration means for restricting radial deflection is provided on the supporting body to cut the existing fluid pipe. In this case, the support that rotates together with the rotating sleeve is arranged in a radial direction with respect to the outer circumference of the existing fluid pipe or the outer circumferences of both housings fixedly provided on the existing fluid pipe via the radial anti-vibration means. It is characterized by regulating the fluctuation of
According to the method of the above configuration, the support body that cooperates with the rotating sleeve on which the cutting tool is mounted moves in the radial direction with respect to the outer periphery of the existing fluid pipe or the outer periphery of both housings fixedly provided on the existing fluid pipe. Since the deflection in the radial direction can be restricted via the stopping means, the cutting accuracy in the radial direction of the existing fluid pipe can be improved. Here, “both housings fixedly provided on the existing fluid pipe” means a state in which both housings do not substantially move with respect to the existing fluid pipe.
[0012]
By the above method, the support body regulates the axial displacement by the axial direction rocking means provided on the fixing member fixedly disposed on both sides of the existing fluid pipe across the cutting position. Is preferred.
In this way, since the axial displacement of the support that cooperates with the rotating sleeve on which the cutting tool is mounted is restricted by the axial anti-vibration means, the axial cutting accuracy of the existing fluid pipe is improved. be able to.
[0013]
In order to achieve the above object, an existing fluid pipe cutting device according to the present invention has a right and left split structure in which the required dimensions are spaced apart in the pipe axis direction on the outer circumferences on both sides sandwiching a predetermined cutting position preset in the existing fluid pipe. A pair of cylindrical casings are mounted in a water-tight manner, and the rotating sleeves that are externally fitted in a sealed manner are controlled on the outer peripheral surfaces of the opposite ends of both casings while restricting movement in the tube axis direction. An existing fluid pipe cutting device that cuts an intermediate portion of a fluid pipe surrounded by both housings by feeding a cutting tool inserted from at least a part of a work hole on an outer peripheral surface toward the center of the fluid pipe. ,
A cutting device having a cutting tool attached to an opening of at least one working hole formed in the rotating sleeve and capable of moving back and forth toward the center of the fluid pipe; and a rotation driving means for rotating the rotating sleeve; A sealing means for sealing the working hole after cutting the fluid pipe,
The cutting device includes a support body mounted on both sides of the rotary sleeve in the tube axis direction, and an outer periphery of the existing fluid pipe or both housings fixed to the existing fluid pipe provided on the support body. It is comprised from the radial direction anti-vibration means provided with the some guide roller which slidably contacts so that rolling is possible, It is characterized by the above-mentioned.
According to the apparatus of the present invention having the above-described configuration, the support that cooperates with the rotary sleeve on which the cutting tool is mounted is provided on the outer periphery of the existing fluid pipe or the outer periphery of both housings fixedly provided on the existing fluid pipe. Since the plurality of guide rollers of the direction rocking means can be slidably brought into contact with each other so as to restrict the shake in the radial direction, the cutting accuracy in the radial direction of the existing fluid pipe can be improved.
[0014]
In the above apparatus, it is preferable that the radial direction rocking means is configured such that the guide roller is in contact with the outer periphery of the existing fluid pipe or the outer peripheral surface of the casing so as to be capable of rolling in a radial direction.
In this way, the cutting device is adjusted to rotate on the same axis with respect to the outer periphery of the existing fluid pipe or the outer peripheral surface of the housing without being affected by the processing error or assembly error of the support. be able to.
[0015]
In the above apparatus, the rotating sleeve is formed in an annular shape, and a pair of supports divided in the tube axis direction are fitted on the outer periphery of both ends, and the outer periphery of the housing is formed on both inner periphery of the rotating sleeve. It is preferable that the surfaces are fitted so that the surfaces are in sliding contact with each other in a watertight manner.
In this way, the inner periphery on both sides of the rotating sleeve and the outer peripheral surface of the casing are sealed, so that even if the existing fluid pipe is cut and the water leaks during the cutting operation by the cutting device, the cutting device Water leakage from between the inner periphery on both sides of the rotating sleeve rotating together with the outer periphery of the housing can be blocked.
[0016]
In the above apparatus, a flange is formed on the outer periphery of the end portion of the cylindrical casing, and both side surfaces of the flange are sandwiched by a holding body that is fitted and fixed to the outer end portion of one cylindrical guide sleeve. Is preferred.
In this way, since both sides of the flange formed at the outer end of the guide sleeve are clamped, the housing is prevented from being tilted by a bending moment immediately before or after the existing fluid pipe is disconnected. By doing so, the load which acts on a cutting tool from a side surface is reduced, and damage to the cutting tool can be prevented.
[0017]
In the above apparatus, the cutting tool is preferably an end mill.
In this way, even a relatively large diameter and thick fluid pipe can be easily cut.
[0018]
In the above apparatus, it is preferable to provide a gate valve device between the opening of the working hole and the cutting device.
If it does in this way, removal of a cutting device and attachment of a sealing means for work hole sealing will become easy.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0020]
First, an existing fluid pipe cutting device according to the present invention will be described with reference to FIGS. Reference numeral 1 denotes an existing fluid pipe, such as a steel water pipe, that has been exposed for a required length by excavating the ground 2, and a pair of left and right cylinders having a vertically divided structure are formed on the outer peripheral surface of the appropriate place. The steel guide sleeves 3 and 4 are externally fitted at a predetermined distance from each other, and both end openings are welded to the outer peripheral surface of the water pipe 1 and the upper and lower butt surfaces are welded to form a sealed shape. It is fixed to.
[0021]
The outer peripheral surface of the left guide sleeve 3 is formed as a spherical surface 3a centered on the tube axis, and annular stoppers 3b are connected to both left and right ends thereof. The right guide sleeve 4 has a right cylindrical shape, and annular stoppers 4a are connected to the outer peripheral surfaces of the left and right ends. Around the water pipe 1 between the left and right guide sleeves 3, 4, a pair of left and right casings 5, 5 made of steel having a vertically divided structure is provided with a required annular gap between the opposing surfaces. C is formed, and it is externally fitted so that an annular space S is formed between the outer peripheral surface of the water pipe 1 and integrated by fastening the upper and lower butted surfaces with bolts. Further, an outward short flange 5 a is connected to the opposite end of each housing 5.
[0022]
The inner peripheral surface of the left end portion of the left casing 5 is in sliding contact with the substantially middle portion of the spherical surface 3a of the left guide sleeve 3, and the packing 7 inserted into the annular groove 6 formed at the left end of the casing 5 is inserted. By pressing and fixing with a plurality of bolts via the split ring 8, the water tightness of the sliding contact surface between the guide sleeve 3 and the left housing 5 is maintained.
[0023]
The inner peripheral surface of the right end portion of the right casing 5 is in sliding contact with the right end of the outer peripheral surface of the right guide sleeve 4 and the packing 7 inserted into the annular groove 6 formed at the right end of the casing 5 Similarly, the watertightness of the sliding contact surface between the guide sleeve 3 and the left housing 5 is maintained by pressing and fixing with a plurality of bolts via the annular ring 8. In addition, although the left-right paired cylindrical housing | casing 5 demonstrated about the example hold | maintained on the outer peripheral surface of the left and right guide sleeves 3 and 4 externally weld-welded by the outer periphery of the water pipe 1, the outer periphery of the water pipe 1 is shown. When formed accurately, the cylindrical housing 5 can be supported on the outer periphery of the water pipe 1.
[0024]
On the outer peripheral surface of the opposite ends of the left and right casings 5, 5, a rotary sleeve 10 having a vertically divided structure is provided with a pair of annular grooves 11 (see FIG. 2) on the inner peripheral surface thereof, and flanges 5 a of both casings 5. The mounting flanges 10a (only one side is shown) which are externally fitted so as to be able to rotate while restricting movement in the tube axis direction are fastened to each other by bolts and nuts 13. Are integrated.
[0025]
A packing 15 is inserted into the annular grooves 14 formed on the inner peripheral surfaces of both ends of the rotating sleeve 10, and both packings 15 are pressed by push wheels 16 bolted to both side surfaces of the rotating sleeve. The watertightness between the outer peripheral surface of the housing 5 and the inner peripheral surface of the rotary sleeve 10 is maintained.
[0026]
The packing 15 is preferably made of hard rubber or the like having a low sliding resistance with respect to the housing 5. As will be described later, the resistance when rotating the rotating sleeve 10 around the housing 5 is reduced, and the packing 15 is twisted. To prevent damage.
[0027]
A work hole 17 having a slightly smaller diameter than the annular gap C formed on the opposing surfaces of the two casings 5 is formed in the central portion of the upper portion of the peripheral wall of the rotary sleeve 10, and a gate valve device 18 is formed at the open end thereof. And the cutting device 19 is attached to the upper part in the sealing shape upwards.
The gate valve device 18 includes a valve body 20 that can open and close a pipe line communicating with the work hole 17 and a moving mechanism 21 that moves the valve body forward and backward in a direction orthogonal to the pipe line by screw feeding.
[0028]
The cutting device 19 includes an end mill 22 that is a rotary cutting tool, a screw feed type lifting mechanism 23 that moves the end mill 22 forward and backward toward the center of the water pipe 1, and a hydraulic motor 24 that rotates the end mill 22.
[0029]
Below the rotary sleeve 10 of the base plate 25 laid on the ground 2, both ends of the drive shaft 26 parallel to the tube axis are fixed by brackets 27, 27, and at both ends of the drive shaft 26. A pair of drive sprockets 28 and 28 are pivotally supported, and a rotational drive means for rotating the rotary sleeve 10 at a low speed by attaching the drive shaft 26 to the rotary shaft 29a of the geared motor 29 at its left end. Composed.
[0030]
As shown in FIG. 4, four support shafts 30 that are parallel to the water pipe 1 are fixed symmetrically by brackets 31 on the outer peripheral surface sandwiching the mounting flange 10 a in the rotating sleeve 10. A driven sprocket 32 is pivotally attached to both ends so as not to rotate.
[0031]
Chains 33 are respectively wound around the left and right driven sprockets 32 and the left and right drive sprockets 28 so as to wind the rotary sleeve 10. Each chain 33 is formed in an endless shape by connecting one chain over each driven sprocket 32 and the drive sprocket 28 and then coupling both ends.
[0032]
When both drive sprockets 28 are rotated by the motor 29 and each chain 33 is rotated, each driven sprocket 32 rotates together with the chain 33, so that the rotary sleeve 10 can rotate around the housing 5.
[0033]
Next, the cutting device of the present invention will be described with reference to FIGS. Reference numerals 40a and 40b denote cylindrical supports, and these supports 40a and 40b are divided in the direction of the tube axis, and are mounted on the left and right outer peripheral surfaces of the guide sleeves 3 and 4 in a watertight manner. The pair of left and right housings 5 that are spaced apart from each other in the tube axis direction are arranged so as to surround them.
[0034]
The support bodies 40a and 40b are flange-shaped annular portions whose opposing end portions are fitted and fixed on both sides of the rotating sleeve 10 in the tube axis direction, and whose outer end portions form a plane orthogonal to the water pipe 1. A contact plate 55 is attached, and these supports 40a and 40b are slidably contacted to the outer periphery of the water pipe 1 or both housings 5 and 5 fixedly provided on the water pipe 1. A radial anti-vibration means 42 having a plurality of guide rollers G is arranged in the circumferential direction.
[0035]
More specifically, the radial anti-vibration means 42 will be described with respect to the radial anti-vibration means 42 arranged on the right side since it has the same structure on the left and right. That is, the radial anti-vibration means 42 is arranged corresponding to a plurality of rectangular through holes H formed at predetermined intervals in the circumferential direction of the outer periphery of the support 40a. A square boss 44 having a guide hole 45 having the same inner diameter is welded at a predetermined interval in the circumferential direction of the outer periphery of the support body 40a so as to be positioned at the same position as the through hole H. A casing 46 is inserted and a rectangular lid plate 48 provided at this end is fixed to the outer end of the boss 44 via a bolt 49.
[0036]
A roller holder 47 that rotatably supports a guide roller G at one end is slidably fitted in the guide hole 45 of the rectangular cylindrical casing 46, and the other end of the roller holder 47 is adjusted. The lower end of the bolt 50 is rotatably locked.
[0037]
A through screw hole 52 is formed in the center of the cover plate 48, and an adjustment bolt 50 is inserted and screwed into the through screw hole 52 to hold the roller holder 47, which is locked at the tip, so as to be movable in the axial direction. ing.
[0038]
A longitudinal groove 47a is formed at the end of the roller holder 47, and a guide roller G is supported in the longitudinal groove 47a by covering the outer periphery of a steel material formed in a disk shape with a urethane rubber having a hardness (HS 80 °). The shaft 54 is pivotally supported.
[0039]
A stepped portion 47 b is formed on one side surface of the roller holder 47 so as to contact the inner periphery of the insertion hole 47 c of the support shaft 54, and a part of the flange 54 a formed at the end of the support shaft 54 is formed on the outer periphery of the support shaft 54. It has been cut into a flat shape up to the contact point.
[0040]
Accordingly, the support shaft 54 inserted from one side surface of the roller holder 47 in which the stepped portion 47b is formed and the guide roller G is inserted and held in the tube axis direction has a flat surface formed in a part of the flange 54a. The support shaft 54 is prevented from rotating in contact with 47b.
[0041]
Next, the axial direction locking means will be described with reference to FIGS. In the figure, reference numeral 57 denotes an axial direction rocking means. The axial direction rocking means 57 is a support leg 34 as a pair of left and right fixing members, and a tap and a nut on the upper end of these support legs 34. On the inner surface of the bracket 56 detachably attached so as to grip the outer periphery of the pipe 1, the same interval as the radial anti-vibration means 42 is provided on the same circumference centered on the pipe axis of the water pipe 1. It is arranged as follows.
[0042]
Specifically, since the structure of the axial direction rocking means 57 is the same as that of the radial direction rocking means 42 except that the boss 44 is not provided, the redundant description is omitted. The support shafts 54 for supporting the guide rollers G of the means 57 are respectively mounted so that the axis thereof is directed in the direction of the water pipe 1 tube axis, and these guide rollers G are annularly abutted on both outer ends of the support bodies 40a and 40b. The adjusting bolt 52 is configured to be movable in the axial direction so as to come into contact with the outer surface of the plate 55.
[0043]
On the other hand, as shown in FIGS. 1 and 2, reference numeral 58 denotes an annular holding body, and this holding body 58 is externally fixed to the outer peripheral surface of the outer end portion of the left cylindrical guide sleeve 3. On the outer peripheral surface of the disk fixed to the outer peripheral surface of the outer end portion, a locking portion 62 facing inwardly protrudes from the inner periphery of the inner end portion in the axial direction and is formed on the same circumference of the disk. A plurality of pressing bolts 65 facing the axial direction are inserted and screwed into the plurality of through screw holes.
[0044]
A flange 64 is formed on the outer periphery of the end of the cylindrical housing 5, and the inner surface of the flange 64 is locked to a locking portion 62 facing the inside of the holding body 58 and the packing 7 is pressed and fixed from the outside. The outer surface of the split annular ring 8 is pressed by a plurality of pressing bolts 65.
[0045]
Next, the cutting method of the existing fluid pipe | tube by the said apparatus is demonstrated. First, as described above, the left and right guide sleeves 3, 4, the casings 5, 5, and the rotating sleeve 10 are attached in this order to the water pipe 1 exposed by excavating the ground 2, and then both sides of the guide sleeves 3, 4. The water pipe 1 is supported by a pair of left and right support legs 34 erected on the base plate 25.
[0046]
Subsequently, the holding body 58 is held in a state where the locking portion 62 is locked to the inner surface of the flange 64 formed on the outer periphery of the end portion of the cylindrical housing 5, and the outer periphery of the outer end portion of the left cylindrical guide sleeve 3. The outer end of the annular ring 8 is fixed to the outer surface of the annular ring 8, and the ends of a plurality of axially facing pressing bolts 65 that are inserted through the disc are brought into contact with each other and moved forward and backward in the axial direction to hold the annular holding body 58 from both axial sides. To do.
[0047]
Next, the opposing divided ends of the cylindrical supports 40a and 40b divided on the left and right sides are inserted and fixed via bolts on both sides in the tube axis direction of the rotary sleeve 10, and the radial anti-vibration means 42 is adjusted. A plurality of guide rollers G are uniformly brought into contact with the outer peripheral surfaces of the left and right casings 5 and 5 by turning the bolts 50.
[0048]
Next, the adjusting bolt 50 of the axial direction rocking means 57 is turned to move the plurality of guide rollers G forward and backward in the axial direction so that the plurality of guide rollers G are annularly abutted at both outer ends of the cylindrical supports 40a and 40b. Evenly contact the outer surface of the contact plate 55.
[0049]
Next, after attaching the gate valve device 18 and the cutting device 19 to the opening of the working hole 17 of the rotary sleeve 10, the drive sprocket 28, the motor 29, and the like are driven on the base plate 25 below the rotary sleeve 10. In addition to installing the means, the support shafts 30 and the driven sprockets 32 are attached to the outer peripheral surfaces of the cylindrical supports 40a and 40b fixed to both sides of the rotary sleeve 10, and the chain 33 is passed over both the sprockets 28 and 32. .
[0050]
In this state (the state shown in FIGS. 1 and 2), the end mill 22 is rotated by operating the hydraulic motor 24, and a handle (not shown) attached to the upper end of the lifting mechanism 23 is rotated to connect the end mill 22 to the water pipe 1. Lower toward the upper end surface of.
[0051]
At the same time as the upper end of the water pipe 1 is drilled by the tip of the end mill 22, the motor 29 is operated to rotate both the chains 33 to rotate the rotating sleeve 10 together with the supports 40a and 40b in one direction. At this time, the support bodies 40a and 40b are guided and supported by the plurality of guide rollers G of the radial anti-vibration means 42, and the annular contact plates 55 at both ends of the support bodies 40a and 40b. Is guided in the axial direction by the guide roller G of the axial direction locking means 57. Note that both side surfaces of the rotating sleeve 10 may be held by guide rollers or the like separately attached to the water pipe 1 to prevent rattling in the pipe axis direction.
[0052]
When the water pipe 1 is thick, it may be cut by rotating the rotating sleeve 10 alternately in the forward and reverse directions while feeding the end mill 22 stepwise. As described above, when the rotary sleeve 10 is rotated, the water pipe 1 is cut by the width of the outer diameter of the end mill 22 as shown in FIG.
[0053]
After the water pipe 1 is cut, the elevator groove 23 of the cutting device 19 is operated to raise the end mill 22 to above the valve body 20 of the gate valve device 18 as shown in FIG. The body 20 is protruded to seal the pipe line above the working hole 17.
[0054]
Next, after removing the cutting device 19 and mounting a water faucet mounting device (not shown), the valve body 20 is opened, and the water faucet 35 is press-fitted into the working hole 17 of the rotary sleeve 10 as shown in FIG. And seal. Next, the stop cock attaching device and the gate valve device 18 are removed, and the retaining plate 36 is fixed to the opening surface of the working hole 17 of the rotating sleeve 10.
[0055]
Next, the support shaft 30, the driven sprocket 32, the chain 33, the drive means such as the drive sprocket 28 and the motor 29, the left and right support legs 34, the base plate 25 and the like attached to the outer peripheral surface of the rotary sleeve 10 are removed. In addition, after removing both the support legs 34, 34 or the left and right support bodies 40a, 40b, if the exposed water pipe 1 is backfilled, the construction is completed.
[0056]
When a tensile or compressive force is applied to the water pipe 1 due to an earthquake or ground subsidence, or when a bending moment acts in a direction perpendicular to the pipe, as shown in FIG. The left casing 5 that can relatively expand and contract between the guide sleeve 4 and the right casing 5 and that is in sliding contact with the spherical surface 3 a of the left guide sleeve 3 is centered on the guide sleeve 3. As a result, the stress acting on the water pipe 1 is absorbed and its breakage is prevented.
[0057]
In addition, since the outer peripheral surface of the left guide sleeve 3 is a spherical surface 3a and the amount of flexibility of the water pipe 1 is increased, there is no possibility of damage even if the relative displacement amount in the vertical direction or the like becomes large.
[0058]
As described above, in the above-described embodiment, when the water pipe 1 is cut, the rotary sleeve 10 to which the cutting tool 22 such as an end mill is attached cooperates with the cylindrical supports 40a and 40b that are driven to rotate. The plurality of support members 40a and 40b are slidably rolling on the outer circumference of the water pipe 1 or on the outer circumferences of both housings 5 and 5 fixedly provided on the water pipe 1. Since it is guided by the guide roller G of 42, the radial deflection of the cutting tool 22 with respect to the outer periphery of the water pipe 1 is restricted, and the cutting accuracy of the water pipe 1 in the radial direction can be improved.
[0059]
Further, when the water pipe 1 is cut, the rotary sleeve 10 equipped with a cutting tool 22 such as an end mill cooperates with the cylindrical support members 40a and 40b that are rotationally driven, and the shafts of both the support members 40a and 40b. Since the guide rollers G of the plurality of axial anti-vibration means 57 are slidably rolled on the outer surfaces of the annular contact plates 55 provided at both ends in the direction, the axial displacement is restricted, so that the water pipe 1 is separated. Immediately before or after being separated, it is possible to prevent the inclination of the housing 5 due to a bending moment, thereby reducing the load acting on the cutting tool 22 from the side surface and preventing the cutting tool 22 from being damaged. it can.
[0060]
In addition, the guide rollers G of the radial anti-vibration means 42 and the axial anti-vibration means 57 are connected to the outer periphery of the casing 5 or the outer surfaces of the annular contact plates 55 at both axial ends of both supports 40a and 40b. Since the advance / retreat amount can be adjusted with respect to the center direction of the pipe 1 or the axial direction of the water pipe 1, the outer circumference of the water pipe 1 or the casing is not affected by processing errors or assembly errors of the supports 40 a and 40 b. The radial or axial vibration of the cutting tool relative to the outer peripheral surface can be minimized, and the cutting accuracy of the water pipe 1 can be improved.
[0061]
Further, since the inner periphery on both sides of the rotary sleeve 10 and the outer peripheral surfaces of the casings 5 and 5 are sealed by the packing 15, even if water leakage occurs with the progress of the cutting process of the water pipe 1 during the cutting operation, it is driven to rotate. The water leakage from the inner periphery on both sides of the rotating sleeve 10 and between the outer periphery of the housing 5 and 5 can be blocked.
[0062]
Since the casing 5 is not rotated as described above and only the rotating sleeve 10 is rotated and cut, the packing 7 interposed between the outer peripheral surface of the water pipe 1 and the casing 5 is damaged. There is no fear.
[0063]
Since the outer peripheral surface of one guide sleeve 3 fixed to the water pipe 1 by welding is a spherical surface 3a and the amount of flexibility is large, relative displacement in the vertical direction and the like of the water pipe 1 is effectively absorbed, and the breakage is prevented. The effect also increases.
[0064]
The present invention is not limited to the above embodiment. In the above embodiment, an example in which an end mill is used as a cutting tool has been described. However, when the water pipe 1 is thin, instead of the end mill 22, A cutting tool such as a parting tool may be used. In this case, a rotary actuator such as the hydraulic motor 24 becomes unnecessary.
[0065]
In the above embodiment, a plurality of driven sprockets 32 are attached to the outer peripheral surface of the rotating sleeve 10 so as not to rotate, and are driven by the chain 33 to rotate the rotating sleeve 10. A ring-shaped sprocket having an upper and lower split structure may be detachably fixed to the surface, and the rotation sleeve 10 may be rotated by hanging a chain 33 around the sprocket.
[0066]
【The invention's effect】
The present invention has the following effects.
[0067]
(A) According to the invention of claim 1, the support that cooperates with the rotating sleeve on which the cutting tool is mounted is the outer periphery of the existing fluid pipe or the outer periphery of both housings fixedly provided on the existing fluid pipe. On the other hand, since the radial runout can be restricted via the radial anti-vibration means, it is possible to improve the cutting accuracy of the existing fluid pipe in the radial direction.
[0068]
(B) According to the invention of claim 2, since the axial displacement of the support that cooperates with the rotating sleeve on which the cutting tool is mounted is restricted by the axial anti-vibration means, the axial direction of the existing fluid pipe The cutting accuracy of cutting can be improved.
[0069]
(C) According to the invention of claim 3, the support that cooperates with the rotary sleeve on which the cutting tool is mounted is the outer periphery of the existing fluid pipe or the outer periphery of both housings fixedly provided on the existing fluid pipe. In addition, since the plurality of guide rollers of the radial direction rocking means can be slidably brought into contact with each other so as to be able to restrict radial deflection, it is possible to improve the accuracy of cutting the existing fluid pipe in the radial direction.
[0070]
(D) According to the invention of claim 4, the cutting device is concentric with respect to the outer periphery of the existing fluid pipe or the outer peripheral surface of the housing without being affected by the processing error or the assembly error of the support. Can be adjusted to rotate.
[0071]
(E) According to the invention of claim 5, since the inner periphery on both sides of the rotating sleeve and the outer peripheral surface of the housing are sealed, during the cutting operation by the cutting device, cutting of the existing fluid pipe proceeds and water leakage occurs. Even if this occurs, it is possible to block water leakage from between the inner periphery on both sides of the rotating sleeve rotating together with the cutting device and the outer periphery of the housing.
[0072]
(F) According to the invention of claim 6, since both side surfaces of the flange formed at the outer end portion of the guide sleeve are sandwiched, the bending moment immediately before or after the existing fluid pipe is cut off. By preventing the casing from tilting, the load acting on the cutting tool from the side surface is reduced, and breakage of the cutting tool can be prevented.
[0073]
(G) According to the invention of claim 7, even a relatively large diameter and thick fluid pipe can be easily cut.
[0074]
(H) According to the invention of claim 8, it becomes easy to remove the cutting device and attach the sealing means for sealing the working hole.
[Brief description of the drawings]
FIG. 1 is a partially cutaway side view showing a state before starting cutting of a fluid pipe in an apparatus of the present invention.
FIG. 2 is a partially enlarged cross-sectional view showing a state before starting to cut a fluid pipe.
FIG. 3A is a cross-sectional view of a radial direction rocking means, and FIG. 3B is a BB cross-sectional view of FIG.
4 is a cross-sectional view taken along the line AA in FIG.
FIG. 5 is a partially cutaway side view showing a state after cutting a fluid pipe in the apparatus of the present invention.
FIG. 6 is a longitudinal sectional side view showing a state where the end mill is raised after cutting and the working hole pipe line is closed by a gate valve.
FIG. 7 is a longitudinal sectional side view showing a state where an attachment device such as a cutting device and a gate valve device is removed and a work hole is sealed.
FIG. 8 is a longitudinal side view showing a state where the fluid pipe is bent.
[Explanation of symbols]
1 Water pipe (existing fluid pipe)
2 ground
3 Guide sleeve
3a spherical surface
3b Annular stopper
4 Guide sleeve
4a Annular stopper
5 Case
5a Flange
6 annular groove
7 Packing
8 ring
10 Rotating sleeve
10a Mounting flange
11 annular groove
13 Nut
14 Annular groove
15 Packing
16 wheel
17 Working hole
18 Gate valve device
19 Cutting device
20 Disc
21 Movement mechanism
22 End mill (cutting tool)
23 Lifting mechanism
24 Hydraulic motor
25 Base plate
26 Drive shaft
27 Bracket
28 Drive sprocket
29 Geared motor
29a Rotating shaft
30 Support shaft
31 Bracket
32 Driven sprocket
33 chain
34 Support legs
35 stopcock
36 Retaining plate
40a, 40b Support
42 Radial detent means
44 Boss
45 Guide hole
46 Square cylindrical casing
47 Roller holder
47a Vertical groove
47c insertion hole
47b Stepped part
48 Cover plate
49 volts
50 Adjustment bolt
52 through screw hole
52 Adjustment bolt
54 Support shaft
54a Flange
55 Annular contact plate
56 Bracket
57 Axial locking means
58 Holder
62 Locking part
64 flange
65 Press bolt
C annular gap
G Guide roller
H square through hole
S ring space

Claims (8)

A pair of left and right cylindrical casings of a split structure separated from each other by a predetermined dimension in the pipe axis direction are water-tightly attached to the outer circumferences on both sides sandwiching a predetermined cutting position set in advance in an existing fluid pipe. The cutting tool inserted through at least a part of the outer peripheral surface of the fluid pipe is inserted into the outer peripheral surface of the fluid tube while rotating the rotating sleeve that is fitted in a sealed manner by restricting movement in the tube axis direction to the outer peripheral surface of the opposite end of the body. A method of cutting an existing fluid pipe that cuts an intermediate portion of a fluid pipe surrounded by both housings by feeding toward the center, wherein a support is attached to both sides of the rotary sleeve in the pipe axial direction together with the rotary sleeve. The support body, which is mounted so as to cooperate, is provided with a radial anti-vibration means for restricting radial deflection in the support body, and the support body that rotates together with the rotating sleeve when cutting the existing fluid pipe, Via the anti-vibration means Cutting method of the existing fluid conduit, characterized in that to the outer periphery of both housing fixedly provided on the outer periphery or the existing fluid tube 設流 body tube and to regulate the vibration in the radial direction. The axial displacement of the support body is restricted by an axial anti-vibration means provided on a fixing member fixedly disposed on both sides of an existing fluid pipe across the cutting position. Item 2. A method for cutting an existing fluid pipe according to Item 1. A pair of left and right cylindrical casings separated by a required dimension in the direction of the pipe axis are water-tightly attached to the outer circumferences of both sides sandwiching a predetermined cutting position set in advance in the existing fluid pipe. The cutting tool inserted through at least a part of the work hole on the outer peripheral surface of the rotary sleeve is rotated while restricting the movement in the pipe axis direction on the outer peripheral surface of the opposite end of the tube and rotating in a sealed manner. An existing fluid pipe cutting device that cuts the middle part of the fluid pipe surrounded by both housings by sending it toward
A cutting device having a cutting tool attached to an opening of at least one working hole formed in the rotating sleeve and capable of moving back and forth toward the center of the fluid pipe; and a rotation driving means for rotating the rotating sleeve; A sealing means for sealing the working hole after cutting the fluid pipe,
The cutting device includes a support body mounted on both sides of the rotary sleeve in the tube axis direction, and an outer periphery of the existing fluid pipe or both housings fixed to the existing fluid pipe provided on the support body. An apparatus for cutting an existing fluid pipe, comprising: a radial direction rocking means provided with a plurality of guide rollers in sliding contact with each other so as to be able to roll. 4. The existing fluid according to claim 3, wherein the radial anti-vibration means is configured such that the guide roller is in contact with an outer periphery of the existing fluid pipe or an outer peripheral surface of the housing so as to be capable of rolling in an adjustable manner in the radial direction. Pipe cutting device. The rotating sleeve is formed in an annular shape, and a pair of supports divided in the tube axis direction are fitted on the outer periphery of both ends, and the outer peripheral surface of the housing is watertight on the inner periphery of both sides of the rotating sleeve. The cutting device of the existing fluid pipe | tube of Claim 3 or 4 currently fitted so that it may slidably contact. 6. A flange is formed on the outer periphery of the end of the cylindrical casing, and both side surfaces of the flange are sandwiched by a holding body that is externally fitted and fixed to the outer end of one cylindrical guide sleeve. The existing fluid pipe cutting device according to any one of the above. The existing fluid pipe cutting device according to claim 3, wherein the cutting tool is an end mill. The existing fluid pipe cutting device according to claim 3, wherein a gate valve device is provided between the opening of the working hole and the cutting device.

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