JP2012210677A - Cutting device and cutting method of existing pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cutting device and a cutting method of an existing pipe capable of reduction in size of the whole cutting device, by restraining a stroke amount of advance-retreat to the existing pipe of a cutting blade.SOLUTION: A seal case is constituted of: a first case 3 fixed to the existing pipe 1 and provided with an on-off valve 7; and a second case 5 provided with the cutting blade 4 for cutting the existing pipe 1 and an advance-retreat driving portion 6 capable of advancing-retreating the cutting blade 4 to the existing pipe 1, and extendably formed corresponding to the existing pipe 1. A tip part of the cutting blade 4 is arranged in close vicinity to the existing pipe 1 on the existing pipe 1 side more than the on-off valve 7 by connecting the first case 3 and the second case 5, and can move by separating from the existing pipe 1 more than the on-off valve 7 by means of the extension of the second case 5.

Description

  The present invention relates to a cutting apparatus and a cutting method for an existing pipe, in which a sealing case is installed in a sealed manner on a part of the existing pipe, and the existing pipe is cut in an uninterrupted flow state via an on-off valve provided in the sealing case.

  A conventional existing pipe cutting device (perforation device) is provided with a gate valve (open / close valve), and a split T-shaped pipe (first case) for sealing an existing water pipe (existing pipe), and the split T-shaped pipe A sleeve (second case) that is integrally provided with a perforating blade that perforates an existing water pipe and an advancing / retreating drive unit that can advance and retreat the perforating blade toward the existing pipe; When the existing water pipe is drilled, the sleeve is shortened toward the existing water pipe so that the tip of the drilling blade is brought close to the existing water pipe via the gate valve. After completion of drilling of the water pipe, there is one in which the sleeve is extended so that the tip of the punching blade is separated from the existing water pipe and the gate valve can be closed (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2007-162862 (2nd page, FIG. 6)

  However, in the existing pipe cutting device (piercing device) described in Patent Document 1, the stroke amount for bringing the perforating blade close to the existing water pipe (existing pipe), and the perforating blade after the existing water pipe is perforated. Since the stroke amount to be separated from the existing water pipe is long, there is a problem that the entire perforating apparatus becomes large and difficult to handle.

  The present invention has been made paying attention to such problems, and provides a cutting apparatus and a cutting method for an existing pipe that can reduce the amount of stroke of the cutting blade with respect to the existing pipe and can reduce the size of the entire cutting apparatus. The purpose is to provide.

In order to solve the above-mentioned problem, the existing pipe cutting device of the present invention comprises:
A cutting device for an existing pipe, in which a sealing case is installed in a sealed manner on a part of the existing pipe, and the existing pipe is cut in an uninterrupted flow state via an on-off valve provided in the sealing case,
The sealing case is fixed to the existing pipe, the first case provided with the on-off valve, a cutting blade for cutting the existing pipe, and a forward / backward drive capable of moving the cutting blade back and forth with respect to the existing pipe And a second case formed to be extendable and contractable with respect to the existing pipe,
The tip of the cutting blade is disposed closer to the existing pipe on the existing pipe side than the on-off valve by connecting the first case and the second case, and It is characterized by being able to move farther from the existing pipe than the on-off valve by using extension.
According to this feature, the first case and the second case are connected to a part of the existing pipe, so that the tip of the cutting blade is disposed closer to the existing pipe than the on-off valve. In addition to shortening the stroke of the advancing / retreating drive unit that moves the existing pipe to the position where cutting of the existing pipe is started, the extension of the second case is used to move the tip of the cutting blade away from the existing pipe rather than the open / close valve Thus, the stroke amount of the advancing / retreating drive unit that retracts the tip of the cutting blade from the existing pipe to a position at which the on-off valve can be opened and closed can be shortened, and the entire cutting device can be reduced in size.

The existing pipe cutting device of the present invention is
The present invention is characterized in that there is provided an extension regulating means for regulating the extension of the second case by the fluid pressure of the fluid flowing into the sealed case by cutting the existing pipe.
According to this feature, the second case can be extended by the fluid pressure while sequentially adjusting the extension restricting means, so that an operator or the like can exert a great force while preventing the second case from being suddenly extended. The second case can be extended without being added.

The existing pipe cutting device of the present invention is
The second case is characterized by being divided into a plurality of nested shapes.
According to this feature, since the second case is divided into a plurality of nested types, the second case can be configured compactly with respect to the maximum extension amount of the second case.

The method for cutting an existing pipe of the present invention is as follows.
A method for cutting an existing pipe, wherein a sealing case is installed in a sealed manner on a part of the existing pipe, and the existing pipe is cut in an uninterrupted flow state through an on-off valve provided in the sealing case,
The sealing case is fixed to the existing pipe, the first case provided with the on-off valve, a cutting blade for cutting the existing pipe, and a forward / backward drive capable of moving the cutting blade back and forth with respect to the existing pipe And a second case formed to be extendable and contractable with respect to the existing pipe,
By connecting the first case and the second case, the tip of the cutting blade is disposed closer to the existing pipe on the existing pipe side than the on-off valve, and the advance / retreat drive unit The cutting blade is moved toward the existing tube to cut the existing tube, and after cutting the existing tube, the tip of the cutting blade is opened and closed using the extension of the second case with respect to the existing tube. It is characterized by being moved to a position farther from the existing pipe than the valve.
According to this feature, the first case and the second case are connected to a part of the existing pipe, so that the tip of the cutting blade is disposed closer to the existing pipe than the on-off valve. In addition to shortening the stroke of the advancing / retreating drive unit that moves the existing pipe to the position where cutting of the existing pipe is started, the extension of the second case is used to move the tip of the cutting blade away from the existing pipe rather than the open / close valve Thus, the stroke amount of the advancing / retreating drive unit that retracts the tip of the cutting blade from the existing pipe to a position at which the on-off valve can be opened and closed can be reduced.

It is a partial cross section figure which shows the cutting device in an Example. It is a partial cross section figure which shows the state which cut | disconnected the fluid pipe | tube. It is a partial sectional view showing the state where the section of the fluid pipe was collected. It is AA sectional drawing which shows the housing | casing and fluid pipe | tube in FIG. It is a partial cross section figure which shows the fluid control installation apparatus in an Example. It is BB sectional drawing which shows the fluid control in FIG. 5, and a support roller. It is a front view which shows a fluid control. It is a bottom view which shows a fluid control. It is a partial cross section figure which shows the state which has arrange | positioned the front-end | tip part of the control fluid close to the fluid pipe | tube. It is a partial cross section figure which shows the state which installed the fluid control in the housing | casing. It is CC sectional drawing which shows the support roller in FIG. It is a partial cross section figure which shows the state which complete | finished installation of the fluid control.

  EMBODIMENT OF THE INVENTION The form for implementing the existing pipe cutting device and cutting method which concern on this invention is demonstrated below based on an Example.

  The existing pipe cutting device and cutting method according to the embodiment will be described with reference to FIGS. 1 will be described as the front side (front side) of the cutting device, and the front side of FIG. 5 will be described as the front side (front side) of the fluid control installation device.

  The code | symbol 1 of FIG. 1 is the fluid pipe | tube 1 made from steel etc. which were embed | buried under the ground as an existing pipe | tube in this invention. In this embodiment, the fluid in the fluid pipe is clean water in this embodiment. However, the fluid flowing in the fluid pipe 1 is not necessarily limited to clean water, and may be industrial water, or may be gas or gas. It may be a fluid pipe through which fluid in a liquid mixture state flows.

  The fluid pipe 1 is attached with a cutting device 2 for cutting a predetermined portion of the fluid pipe 1 in an undisturbed water state. As shown in FIG. 1, the cutting device 2 includes a casing 3 as a first case according to the present invention that is directly attached to the fluid pipe 1 by welding, and the present invention for cutting a predetermined cutting portion of the fluid pipe 1. A cutter member 4 as a cutting blade, a storage case 5 as a second case in which the cutter member 4 is stored, and the cutter member 4 can be moved back and forth between the fluid pipe 1 and the storage case 5. It is mainly composed of a possible advance / retreat drive unit 6.

  Among these, as shown in FIGS. 3 and 4, the casing 3 has a central portion in which a predetermined cutting portion of the fluid pipe 1 is disposed in a substantially circular shape in a cross-sectional view taken along the line AA. However, it is a split T-shaped tube composed of two connecting members that can be divided in the radial direction of the fluid pipe 1, and after connecting the two connecting members, welding is performed as described above, thereby 3 and the outer peripheral surface of the fluid pipe 1 are in close contact with each other. An opening / closing valve 7 for opening and closing the rightward opening of the housing 3 is provided on the right side of the housing 3 so as to be movable in the front-rear direction.

  The inner walls of the upper end portion and the lower end portion of the housing 3 are formed on a tapered surface 3a that is inclined from the right side to the left side toward the fluid pipe 1 side. A pair of guide pieces 3b for guiding a control fluid 11 (to be described later) into the housing 3 against the fluid pressure of the fluid flowing in the fluid pipe 1 protrudes from the front end portion and the rear end portion of these tapered surfaces 3a. It is installed.

  As shown in FIG. 1, the storage case 5 includes a cylindrical body 8 that can be connected to the right end of the housing 3 in a watertight manner and communicates in the left-right direction, and a case body 9 that opens toward the left. ing. The storage case 5 has a nesting structure in which the left and right width dimensions can be expanded and contracted by the cylindrical body 8 and the case main body 9, and the cylindrical body 8 and the case main body 9 are watertightly held by a packing (not shown). Yes.

  The cylindrical body 8 and the case body 9 are connected to each other so as not to move relative to each other by a plurality of fixing bolts / nuts 23 via respective flanges. Furthermore, the cylinder body 8 and the case body 9 have a plurality of operations having bolts formed longer in the left-right width direction of the cutting device 2 than the respective fixing bolts / nuts 23 through the respective flanges. They are connected by bolts and nuts 10 (only one is shown in this embodiment). Although details will be described later, by rotating these operation bolts / nuts 10 with the fixing bolts / nuts 23 removed from the flanges of the cylinder 8 and the case body 9, The case body 9 can be relatively moved in the left-right width direction.

  As shown in FIGS. 1 and 2, the advance / retreat drive unit 6 is watertightly connected to the right end of the case body 9. From the left part of the advance / retreat drive unit 6, a shaft member 6 a extends horizontally toward the fluid pipe 1 in the case body 9. The advancing / retracting drive unit 6 can rotate the shaft member 6a around the axis by power such as hydraulic pressure or electric power, and the housing 3 and the case body 9 in which the fluid pipe 1 is disposed. It is possible to advance and retreat between. The advancing / retreating drive unit 6 is provided with a drain valve (not shown) capable of communicating the inside and the outside of the advancing / retreating drive unit 6 by being open and communicating with the inside of the case body 9 in a watertight manner. Yes.

  The cutter member 4 is formed to have a diameter longer than the diameter of the fluid pipe 1 in order to cut the fluid pipe 1. The cutter member 4 includes a drill member 4a that is fixed to the distal end portion of the shaft member 6a, has the same axis as the shaft member 6a, and extends toward the fluid pipe 1 side.

  As shown in FIG. 1, the cutter member 4 and the drill member 4a are formed to have a left-right width dimension that is longer than the left-right width dimension of the storage case 5 that is not stretched. For this reason, the housing 3 and the storage case 5 in a state in which the on-off valve 7 is released are connected in a watertight manner, so that both ends of the cutter member 4 and the drill member 4 a are more fluid pipes than the on-off valve 7. It is arranged close to the outer peripheral surface of the fluid pipe 1 on one side.

  In order to cut the fluid pipe 1 with the cutting device 2 configured as described above, first, as shown in FIG. The storage case 5 in which the cutter member 4 is stored is connected in a watertight manner. The left and right width dimensions of the storage case 5 are adjusted so as to be the shortest by moving the case main body 9 in the left direction with respect to the cylindrical body 8 by rotating the operation bolt / nut 10 in advance. deep.

  At this time, by connecting the housing 3 and the storage case 5, a part of the fluid pipe 1 is sealed in a watertight manner. That is, in this embodiment, the casing 3 and the storage case 5 constitute a sealed case in the present invention. Further, as described above, the distal ends of the cutter member 4 and the drill member 4 a are disposed close to the outer peripheral surface of the fluid pipe 1.

  Then, as shown in FIG. 2, after opening the drain valve (not shown) provided in the advance / retreat drive unit 6, the advance / retreat drive unit 6 is driven to rotate the cutter member 4 via the shaft member 6a. Advance toward the fluid pipe 1. At this time, a predetermined cutting portion of the fluid pipe 1 is cut around the drill member 4a by the cutter member 4 while being drilled by the drill member 4a. The section 1a of the fluid pipe 1 generated by cutting the fluid pipe 1 by the cutter member 4 is held in the cutter member 4 by the drill member 4a drilled in the section 1a.

  Further, at this time, the cutting of the fluid pipe 1 while the cutter member 4 is rotating causes a rotational moment in the circumferential direction of the shaft member 6a to occur in the case main body 9, but the cylindrical body 8 and the case main body 9 Are connected by a plurality of fixing bolts and nuts 23, and thus the rotation of the shaft member 6a of the case body 9 in the circumferential direction is prevented.

  On the other hand, the fluid flowing in the fluid pipe 1 flows out of the fluid pipe 1 into the housing 3 and the storage case 5 by filling the fluid pipe 1 and fills the housing 3 and the storage case 5. The drainage valve is drained out of the cutting device 2 from the opened drain valve. Note that the chips generated by the cutting of the fluid pipe 1 by the cutter member 4 are discharged from the cutting apparatus 2 along the water flow generated from the fluid pipe 1 toward the drain valve.

  Furthermore, the cylindrical body 8 and the case main body 9 constituting the storage case 5 are subjected to fluid pressure due to the fluid flowing in from the fluid pipe 1, but there are a plurality of movements of the case main body 9 relative to the cylindrical body 8 in the right direction. Since the operation bolt / nut 10 and the fixing bolt / nut 23 are regulated, extension of the storage case 5 due to fluid pressure is prevented.

  Next, after closing the drain valve, as shown in FIG. 3, the shaft member 6a is moved backward by driving the advance / retreat drive unit 6 in the reverse direction, and the cutter member 4 and the slice 1a are removed from the housing 3 into the storage case 5. Move inward. At this time, the right side portion of the cutter member 4 and a part of the section 1 a are disposed in the storage case 5, and the distal end portion of the cutter member 4 is disposed on the left side of the on-off valve 7.

  Further, after removing all the fixing bolts / nuts 23 from the flanges of the cylinder 8 and the case body 9, the operation bolts / nuts 10 are sequentially rotated to move the case body 9 to the right of the cylinder body 8. Allow the moving range. At this time, since fluid pressure is applied to the case body 9, the operator can extend the storage case 5 in the right direction only by rotating these operation bolts and nuts 10. Since the case body 9 can be moved in the right direction only within the movement range permitted by the operation bolt / nut 10, the sudden expansion due to the fluid pressure of the storage case 5 is prevented. That is, these operation bolts and nuts 10 constitute the expansion / contraction restriction means in the present invention.

  The cutter member 4 connected to the case body 9 via the shaft member 6a of the advance / retreat drive unit 6 is moved to the right, which is a direction away from the fluid pipe 1, by extending the storage case 5 in the right direction. The case main body 9 moves by the distance moved in the right direction.

  In addition, the storage case 5 is formed in the left-right width dimension longer than the cutter member 4 and the drill member 4a because the case body 9 is moved rightward by the fluid pressure. Therefore, the cutter member 4, the drill member 4a, and the slice 1a are completely stored in the storage case 5. That is, the front ends of the cutter member 4 and the drill member 4 a are arranged on the right side of the on-off valve 7.

  After the cutter member 4, the drill member 4a and the slice 1a are stored in the storage case 5, as shown in FIG. The case 5 is removed from the housing 3 and the cutting of the fluid pipe 1 by the cutting device 2 is finished.

  Next, a fluid control installation device 12 that inserts and arranges the fluid control 11 in the housing 3 having the cut portion of the fluid pipe 1 that is the predetermined cut portion in the present invention will be described.

  As shown in FIG. 5, the fluid control device 12 includes a housing 3 attached to the fluid pipe 1 as described above, and a fluid control system that is inserted and disposed in the housing 3 that is a cut portion of the fluid pipe 1. 11, a storage case 13 for storing the fluid control 11, and an advance / retreat drive unit 14 capable of moving the control fluid 11 back and forth between the housing 3 and the storage case 13. Yes.

  As shown in FIG. 5, the storage case 13 is connected to the right end portion of the housing 3 in a watertight manner and is connected to the right end portion of the base body 15. And a moving body 16 having a vertical width dimension shorter than 15. The storage case 13 has a nesting structure in which the left and right width dimensions can be expanded and contracted by the base body 15 and the moving body 16, and the base body 15 and the moving body 16 are watertightly held by a packing (not shown). Yes.

  As shown in FIGS. 5 and 9, the base body 15 and the movable body 16 are connected to each other by a plurality of operation bolts and nuts 17 through their respective flanges (only one is shown in this embodiment). The movable body 16 can be moved in the left-right width direction with respect to the base body 15 by rotating these operation bolts and nuts 17.

  As shown in FIGS. 6 and 11, a pair of front and rear through holes 15 a are formed at the lower end of the left portion in the base body 15, as shown in FIGS. 6 and 11. In these through holes 15a, a base 18 having a pivot 18a facing in the front-rear direction is inserted and arranged at the upper end, and a support roller 19 is pivotally supported on both pivots 18a. An operation screw 20 is screwed into the through holes 15a from below. The upper end portions of these operation screws 20 are loosely fitted to the lower end portion of the base portion 18. For this reason, the support roller 19 provided on both bases 18 via the pivot 18a can adjust the amount of protrusion from the through hole 15a into the base body 15 as the operating screw 20 is screwed. Yes.

  As shown in FIG. 5, the advancing / retreating drive unit 14 is watertightly connected to the right end of the moving body 16. From the left part of the advance / retreat drive unit 14, a shaft member 14 a extends horizontally toward the fluid pipe 1 in the storage case 13. The advance / retreat drive unit 14 can move the shaft member 14a forward and backward between the housing 3 in which the fluid pipe 1 is disposed and the storage case 13 by power such as hydraulic pressure or electric power. .

  A bracket 14b for connecting the shaft member 14a and the fluid control 11 is attached to the tip of the shaft member 14a. The bracket 14 b is provided with an auxiliary roller 21 that is pivotally supported by a pivot (not shown) that faces in the front-rear direction. The auxiliary roller 21 is in contact with a lower end surface in the base body 15. . For this reason, the auxiliary roller 21 moves in the base body 15 together with the shaft member 14a and the bracket 14b while rolling on the lower end surface in the base body 15 by the driving of the advance / retreat driving unit 14 described above. . The advancing / retreating drive unit 14 is provided with a drain valve (not shown) capable of communicating the inside and the outside of the advancing / retreating drive unit 14 with each other by being open and communicating with the inside of the moving body 16 in a watertight manner. Yes.

  As shown in FIGS. 6, 7, and 8, the fluid control 11 includes a lid portion 11 a formed in a circular shape (not shown) having substantially the same shape as the inner shape of the right portion of the housing 3, and the lid portion. It is comprised from the water control part 11b extended toward the left from 11a. A bracket 14b can be connected to the right portion of the lid portion 11a. In addition, the water control part 11b is formed to have a front-rear width dimension that can be inserted and arranged between guide pieces 3b, 3b (see FIG. 4) projecting in the housing 3, and an upper end part and a lower end part. Is formed on a tapered surface 11c that is inclined from the right side to the left side toward the central portion in the vertical width direction of the water control portion 11b. That is, the fluid control 11 in the present embodiment is formed in a tapered shape from the right side to the tip end portion which is the left end portion.

  Further, the upper and lower end edges and the left end edge of the water control part 11b, which is the tapered surface 11c, and the peripheral part of the lid part 11a are integrally provided with a close contact part 22 made of elastic rubber or the like. Has been. The inclination of the tapered surface 11c is the same angle as the inclination of the tapered surface 3a formed in the housing 3.

  A pair of rail parts 11d are provided at the lower part of the water control part 11b toward the front side and the back side of the water control part 11b. These rail parts 11d are horizontally extended toward the left-right width direction of the fluid control 11 which is the advancing / retreating direction of the fluid control 11. Further, since the fluid control 11 is stored in the storage case 13 on the lower surfaces of the rail portions 11d, the support rollers 19 come into contact with each other from below. That is, in the state where the fluid control 11 in the present embodiment is stored in the storage case 13, the load on the left side is slidably supported by the support roller 19 via the rail portion 11d, and the right portion The side load is supported by the auxiliary roller 21 via the bracket 14b.

  In order to install the control fluid 11 in the housing 3 using the control fluid installation device 12 configured as described above, first, as shown in FIG. Instead of the storage case 5 which is a part, the storage case 13 which is a part of the fluid control installation device 12 is connected watertight from the right side to the housing 3 which is watertightly sealed by the on-off valve 7. The left and right width dimensions of the storage case 13 are adjusted in advance to be the longest by moving the base body 15 moving body 16 to the right by rotating the operation bolt / nut 17 in advance. At this time, the housing 3 and the storage case 13 are connected to each other so that the housing 3 and the storage case 13 are sealed in a watertight manner.

  Then, as shown in FIG. 9, after opening a drain valve (not shown) provided in the advance / retreat drive unit 14, the on-off valve 7 is opened. At this time, the fluid flowing in the fluid pipe 1 fills the storage case 13 and the housing 3 and is drained out of the cutting device 2 from the opened drain valve.

  Next, after closing the drain valve, the operation bolts and nuts 17 are sequentially rotated, so that the movable body 16 is directed toward the inside of the housing 3 as a predetermined cutting position with respect to the base body 15 and left Push in to move in the direction. At this time, the moving body 16 receives fluid pressure from the fluid filled in the storage case 13 against the movement in the left direction, but the moving body 16 is more fluid than the area where the base body 15 receives the fluid pressure. Since the area receiving the pressure is small, the moving body 16 can move by reducing the fluid pressure received from the fluid by moving in the left direction.

  Furthermore, since the moving body 16 is moved in the left direction by the rotating operation of the operation bolts and nuts 17, the operator can move the moving body 16 in the left direction without requiring much labor. it can. After the movement of the moving body 16 in the left direction is completed, the base body 15 and the moving body 16 are connected to each other so as not to move relative to each other by a plurality of fixing bolts and nuts 23 via respective flanges.

  The left-right width dimension of the storage case 13 is shortened by the leftward movement of the moving body 16, and the fluid control 11 connected to the moving body 16 via the bracket 14 b of the advance / retreat driving unit 14 applies the load to the support roller 19. And while being supported by the auxiliary roller 21, the movable body 16 moves toward the inside of the housing 3 by the distance moved in the left direction. At this time, the front end portion of the fluid control 11 is disposed closer to the fluid pipe 1 on the fluid pipe 1 side than the on-off valve 7.

  By driving the advance / retreat drive unit 14 from this state, the fluid control 11 is moved toward the housing 3 as shown in FIG. At this time, since the fluid control 11 is supported from below by the support roller 19 and the auxiliary roller 21, it is possible to prevent a downward moment from being generated in the shaft member 14a via the bracket 14b due to the load of the fluid control 11. ing. Furthermore, since the upper end portion and the lower end portion of the damping fluid 11 are inserted between the front and rear guide pieces 3b, 3b, positional displacement in the front-rear direction due to fluid pressure is prevented from the fluid. Then, by completely inserting and arranging the fluid control 11 in the housing 3, the close contact portion 22 is elastically deformed between the fluid control 11 and the housing 3, and the fluid in the housing 3 is The flow path is completely blocked.

  As shown in FIGS. 10 and 11, the operator penetrates the support roller 19 by rotating both the operation screws 20 in a state in which the fluid control 11 is inserted and disposed in the housing 3 by a predetermined amount. After being accommodated in the hole 15a, the fluid control 11 is completely inserted into the housing 3 as described above. By adjusting the amount of protrusion of the support roller 19 into the base body 15 in this way, the auxiliary roller 21 can be smoothly inserted into the lower end of the base body 15 until the fluid control 11 is completely inserted into the housing 3. Can be rolled. As shown in FIG. 10, the auxiliary roller 21 stops on the right side of the on-off valve 7 when the fluid control 11 is completely inserted into the housing 3.

  As shown in FIGS. 10 and 12, the drain valve is opened to drain the fluid in the storage case 13, and then a fixing bolt (not shown) is screwed into the right side of the fluid control 11 from the outside of the housing 3. Thus, the fluid control 11 is fixed in the housing 3. And the fluid control 11 is removed from the bracket 14b when an operator puts a hand through an operation port (not shown) provided in the base body 15. Finally, the shaft member 14a and the bracket 14b are housed in the housing case 13 by driving the advancing / retreating drive portion 14 in the reverse direction, and then the housing 3 is closed by the on-off valve 7 so that the fluid control 11 enters the housing 3 Finish the installation.

  In this embodiment, as described above, the support roller 19 that supports the lower end portion of the fluid control 11 can be adjusted in the amount of protrusion into the base body 15 by rotating the operation screw 20. In the case of using a fluid control having a vertical dimension different from that of the fluid control 11 used in the present embodiment, the protrusion amount of the support roller 19 is appropriately adjusted according to the position of the rail portion of the fluid control, It is possible to support the fluid control from below.

  As described above, in the cutting device 2 according to the present embodiment, the tip of the cutter member 4 is connected to the fluid pipe 1 on the fluid pipe 1 side with respect to the on-off valve 7 by connecting the housing 3 and the storage case 5. The position at which the cutter member 4 starts to be cut off from the fluid pipe 1 because the cutter case 4 is disposed close to and can be moved farther from the fluid pipe 1 than the on-off valve 7 by using the extension of the storage case 5. In addition to shortening the stroke of the forward / backward drive unit 6 that is moved to the position, the distal end of the cutter member 4 is moved away from the fluid pipe 1 rather than the on-off valve 7 by using the extension of the storage case 5. The stroke amount of the advancing / retreating drive unit 6 that retracts the tip of the cutter member 4 from the fluid pipe 1 to a position at which the on-off valve 7 can be opened and closed can be shortened, and the entire cutting device 2 can be downsized.

  In addition, since the fluid pipe 1 is cut, operation bolts and nuts 10 are provided to adjust the extension of the storage case 5 due to the fluid pressure of the fluid flowing into the storage case 5 so that the storage case 5 can be adjusted. Since it can be extended by fluid pressure while adjusting the operation bolts and nuts 10 in order, the storage case 5 can be extended without applying too much force while preventing the storage case 5 from rapidly expanding. It can be performed.

  Further, since the storage case 5 is divided into a plurality of nested shapes, the storage case 5 can be made compact with respect to the maximum extension amount of the storage case 5.

  Although the embodiments of the present invention have been described with reference to the drawings, the specific configuration is not limited to these embodiments, and modifications and additions within the scope of the present invention are included in the present invention. It is.

  For example, in the above-described embodiment, the cutter member 4 is advanced from the right side of the fluid pipe 1 to cut the fluid pipe 1, but a sufficient space for installing the cutting device 2 above the fluid pipe 1. May exist, the cutting device 2 may be provided above the fluid pipe 1, and the cutter member 4 may be advanced from above to cut the fluid pipe 1.

1 Fluid Pipe 2 Cutting Device 3 Housing (First Case)
3a Tapered surface 4 Cutter member (cutting blade)
5 Storage case (second case)
6 Advance / Retreat Drive 7 Open / Close Valve 10 Operation Bolt / Nut
DESCRIPTION OF SYMBOLS 11 Fluid control 11c Tapered surface 11d Rail part 12 Fluid control installation apparatus 13 Storage case 14 Advance / retreat drive part 15 Base body 16 Moving body 17 Operation bolt and nut 19 Support roller 21 Auxiliary roller 22 Contact part

Claims (4)

A cutting device for an existing pipe, in which a sealing case is installed in a sealed manner on a part of the existing pipe, and the existing pipe is cut in an uninterrupted flow state via an on-off valve provided in the sealing case,
The sealing case is fixed to the existing pipe, the first case provided with the on-off valve, a cutting blade for cutting the existing pipe, and a forward / backward drive capable of moving the cutting blade back and forth with respect to the existing pipe And a second case formed to be extendable and contractable with respect to the existing pipe,
The tip of the cutting blade is disposed closer to the existing pipe on the existing pipe side than the on-off valve by connecting the first case and the second case, and An existing pipe cutting device characterized in that it can move away from the existing pipe rather than the on-off valve by using extension.   2. An extension regulating means for regulating the extension of the second case by the fluid pressure of the fluid flowing into the sealed case when the existing pipe is cut is provided. The existing pipe cutting device described.   The existing pipe cutting device according to claim 1, wherein the second case is divided into a plurality of nested shapes. A method for cutting an existing pipe, wherein a sealing case is installed in a sealed manner on a part of the existing pipe, and the existing pipe is cut in an uninterrupted flow state through an on-off valve provided in the sealing case,
The sealing case is fixed to the existing pipe, the first case provided with the on-off valve, a cutting blade for cutting the existing pipe, and a forward / backward drive capable of moving the cutting blade back and forth with respect to the existing pipe And a second case formed to be extendable and contractable with respect to the existing pipe,
By connecting the first case and the second case, the tip of the cutting blade is disposed closer to the existing pipe on the existing pipe side than the on-off valve, and the advance / retreat drive unit The cutting blade is moved toward the existing tube to cut the existing tube, and after cutting the existing tube, the tip of the cutting blade is opened and closed using the extension of the second case with respect to the existing tube. A method for cutting an existing pipe, wherein the pipe is moved to a position farther from the existing pipe than the valve.

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