JP5620066B2 - Pipe cutting device - Google Patents

Description

  The present invention relates to a tube cutting device for cutting a predetermined portion of an existing fluid pipe in a casing having a split structure and having an opening that can be opened and closed, and watertightly surrounding an existing fluid pipe.

  The conventional pipe cutting device is placed in a case that surrounds the existing fluid pipe in a water-tight manner, and is mainly connected to the main body attached to the existing fluid pipe and a cutting tool to advance and retract in the radial direction of the existing fluid pipe. A cutting unit that has a stepping screw portion that is rotatably attached to the main body portion, and a kicker portion that is fixedly attached in the vicinity of the rotation path of the cutting unit. The kicker piece of the kicker part comes into contact with and engages with the stepping screw part, the stepping screw part rotates, the cutting tool advances in the radial direction of the existing fluid pipe, and the existing fluid pipe is cut ( For example, see Patent Document 1).

Japanese Patent Laid-Open No. 3-14996 (page 4, FIG. 16)

  In the tube cutting device described in Patent Document 1, the kicker piece abuts and engages with the stepping screw portion with an insufficient amount of contact depending on the mounting state of the kicker portion, and the stepping screw portion does not rotate. There is a fear.

  The present invention has been made paying attention to such problems, and an object of the present invention is to provide a tube cutting device that can reliably rotate the stepping screw portion by contact engagement with the kicker piece. .

In order to solve the above-mentioned problem, the tube cutting device of the present invention comprises:
A pipe cutting device that has a split structure and has an opening that can be opened and closed, and that cuts a predetermined portion of the existing fluid pipe in a casing that watertightly surrounds the existing fluid pipe,
A main body fixedly attached to the existing fluid pipe, a cutting unit attached to the main body so as to be rotatable in the circumferential direction of the existing fluid pipe, and fixed to a predetermined non-rotating place in the vicinity of the rotation path of the cutting unit With a kicker part mounted, and
The cutting unit is connected to the cutting bit capable of cutting the peripheral wall of the existing fluid pipe along the circumferential direction, and is connected to the cutting bit, and rotates around the rotation axis to thereby cut the cutting bit into the diameter of the existing fluid pipe. A stepping screw part that advances and retreats in the direction, and a rotary blade fixedly attached around the rotation axis of the stepping screw part,
The kicker portion includes an abutment surface that is in line contact with and abuts with the abutment surface of the rotating blade that rotates in the circumferential direction, and the stepping screw portion together with the rotating blade by the contact engagement. A kicker piece arranged to rotate around the rotation axis, a support portion that supports the kicker piece and is fixedly attached to the non-rotating predetermined position, and gradually tapers toward the rotation axis. A front end portion, the abutting surface is formed in a substantially flat shape at the front end portion, and the kicker portion is attached to the fixed portion so that the corresponding contact surface is positioned in a radial direction of the existing fluid pipe, The radiating portion of the rotating blade is formed in a shape that gradually tapers in a direction away from the rotating shaft, and the adjusting screw portion of the support portion is attached to the fixed portion, whereby the stepping screw portion of the kicker piece Adjusting the degree of contact with In Ukoto, the kicker member is disposed so as to abut surfaces of the kicker piece abuttingly engages in line contact after surface contact with the original contact with the contact surface of the rotary blade It is characterized by that.
According to this feature, the kicker piece has the contact surface of the kicker piece at least in line contact with the contact surface of the rotary blade so that the stepping screw portion is rotated about the rotation axis together with the rotary blade. Since the kicker piece and the rotary blade are in contact with each other with a sufficient contact amount by being arranged to rotate, the stepping screw part is reliably rotated by the corresponding contact engagement, and the cutting tool is rotated. It can be stepped in the radial direction of the existing fluid pipe, and the contact surface of the kicker piece is in contact with the contact surface of the rotary blade at the beginning of contact with the surface with a larger contact amount than the line contact, The impact at the time of contact of both contact surfaces is softened, and the kicker piece and the rotating blade are not damaged.

The tube cutting device of the present invention comprises:
The stepping screw portion is arranged so that a rotation shaft of the stepping screw portion is positioned in a radial direction of the existing fluid pipe.
According to this feature, the stepping screw portion is disposed so that the rotation shaft of the stepping screw portion is positioned in the radial direction of the existing fluid pipe, so that the stepping screw portion is connected to the stepping screw portion. Compared with the case where the rotary shaft is disposed so as to be positioned in a direction different from the radial direction of the existing fluid pipe, the contact surface of the rotary blade that makes contact with the contact surface of the kicker piece at least in line contact is provided. It can be formed in a simple shape.

The tube cutting device of the present invention comprises:
The kicker piece is a shaft piece that can be adjusted toward the rotation axis of the stepping screw portion with respect to the support portion.
According to this feature, since the kicker piece is a shaft piece that can be adjusted toward the rotation axis of the stepping screw portion with respect to the support portion, the support portion can be applied to the non-rotated predetermined portion. There is no need to attach the contact surface to the contact surface of the rotating blade at least in line contact with the contact surface. can do.

The tube cutting device of the present invention comprises:
The cutting unit further includes a load member that suppresses rotation of the stepped screw portion by a predetermined load.
According to this feature, even if the abutting surface of the kicker piece is at least in line contact with the abutting surface of the rotary blade and abuts and engages to increase the momentum and the stepping screw portion tries to rotate, the load member It is possible to prevent the stepping amount of the cutting tool from increasing per one rotation of the existing fluid pipe in the circumferential direction without excessive rotation of the stepping screw portion.

It is a front view which shows the state in which the upper case is attached surrounding the existing fluid pipe | tube. It is a partial cross section figure which shows the state by which the tube cutting device has been arrange | positioned at the cutting part. It is a partial sectional view showing a tube cutting device. It is a partial side sectional view showing a tube cutting device. (A) is sectional drawing which shows the cutting unit and kicker part of FIG. 3, (b) is an upper sectional view of (a). FIG. 5 is an enlarged view of FIG. 4. It is a top sectional view showing the cutting unit and kicker part which show the state where the contact degree is adjusted by the adjustment part. It is sectional drawing which shows the state which the cutting tool has moved to the internal diameter direction of the existing fluid pipe | tube. (A)-(d) is explanatory drawing which shows the state which a radiation | emission part rotates 1 pitch for every rotation of a cutting | disconnection unit by contact | abutting engagement with a kicker piece in time series. It is a partial sectional side view of the pipe cutting device which shows the kicker part of a modification. It is sectional drawing which shows the kicker part of a modification.

  EMBODIMENT OF THE INVENTION The form for implementing the pipe | tube cutting device which concerns on this invention is demonstrated below based on an Example.

  An embodiment of the present invention will be described with reference to FIGS. In the following description, the front side in FIG. 3 is the front side of the tube cutting device, and the left and right sides in FIG. 3 are the left and right sides of the tube cutting device.

  In general, in an existing fluid pipe that is buried in the ground and through which clean water flows, a water control body disposing step is performed in which a water control body is disposed in a predetermined water-free state at a predetermined location of the existing fluid pipe in order to control the flow of water. In this type of water control body arrangement step, in order to arrange the water control body at a predetermined location of the existing fluid pipe, the predetermined location of the existing fluid pipe is cut in a non-continuous water state using a pipe cutting device. In this embodiment, a pipe cutting device that cuts an existing fluid pipe in an indefinite water state will be described.

  1 is an existing fluid pipe in which the fluid embedded in the soil and flowing inside is clean water. After cleaning the existing fluid pipe P, the existing fluid pipe P is a fixing member 101 made of H steel and concrete, Reinforced and fixed at 101.

  Next, the existing fluid pipe P is surrounded in a watertight manner using the housing 2. Here, the structure of the casing 2 will be described. As shown in FIG. 2, the casing 2 has a split structure, and mainly includes an upper case 2d and a lower case 2e having a split structure, and a valve inside. And an on-off valve 2a provided with a body 2b.

  The upper case 2d surrounds the existing fluid pipe P along the outer peripheral surface by the lower case 2e. The lower case 2e is supported by a jack 75 and supports the lower case 2e protruding in the front-rear direction of the drawing. A member W is formed.

  The on-off valve 2a is detachably provided on the upper part of the upper case 2d, and the on-off valve 2a constitutes an openable / closable opening of the present invention. As shown in FIG. 2, a work cylinder 11 and a lid portion 12 that are in watertight communication with the housing 2 via the open / close valve 2a in an open state are detachably provided on the open / close valve 2a.

  The lid 12 has an insertion hole 12a through which one end of the drive long shaft 106 extends to the outside of the work cylinder 11, and the inside of the housing 2 and the work cylinder 11 with the drive long shaft 106 inserted through the insertion hole 12a. And a sealing material 112 for maintaining the sealed state. In addition, the sealing material 112 is attached to the upper part of the cover part 12 in the state fitted to the insertion hole 12a, and the drive long shaft 106 is inserted into the sealing material 112 in a watertight manner.

  Next, the enclosure of the casing will be described. As shown in FIG. 1, first, in the lower case 2 e of the casing 2 that surrounds the existing fluid pipe P in a watertight manner, the existing fluid pipe P in the casing 2 is formed. In the state where the lower guide 4b (see FIG. 3) of the guide portion 4 in the tube cutting device 1 for cutting the excision portion K is supported, the lower case 2e and the lower guide 4b are shown below the existing fluid pipe P by the suspension means 102. It arrange | positions so that the outer peripheral surface in the side may be surrounded, and the supporting member W of the lower case 2e is supported with the some jack 75. FIG. Then, as shown in FIG. 2, the tube cutting device 1 is disposed in the excision K in the housing 2.

  Here, the structure of the tube cutting device 1 will be described. As shown in FIGS. 3 and 4, the tube cutting device 1 mainly includes a guide portion 4 as a main body portion fixedly attached to an existing fluid pipe P, A cutting unit 3 that is rotatably attached in the circumferential direction of the existing fluid pipe P, a kicker portion 30 that is fixedly attached to a predetermined portion of the non-rotating guide portion 4 in the vicinity of the rotation path of the cutting unit 3, and a drive motor described later The rotational transmission force generated by 6 is transmitted through the expansion joint portion 107 to drive the transmission unit 5 to rotationally drive the cutting unit 3. Further, the upper guide 4a and the lower guide 4b constituting the guide portion 4 are fixedly held on the outer peripheral surface of the existing fluid pipe P in the casing 2 that is watertightly sealed outside the existing fluid pipe P. (See FIG. 2).

  A plurality of bolts 28 provided along the circumferential direction of the upper guide 4a and the lower guide 4b are screwed in the inner diameter direction and come into contact with the outer peripheral surface of the existing fluid pipe P, whereby the upper guide 4a and the lower guide 4b. Is positioned and fixed with respect to the existing fluid pipe P.

  On the upper part of the guide part 4, a drive shaft 7 ′ fixedly connected to the expansion joint part 107, a drive shaft 7 having a gear 7 a meshing with a gear 7 a ′ provided at the tip of the drive shaft 7 ′, A pair of drive sprockets 8 provided at both ends of the drive shaft 7 to which the rotational drive force is applied via the drive long shaft 106, the expansion joint 107, and the drive shaft 7 'by the drive motor 6 that generates the rotational drive force; The above-described drive transmission unit 5 is connected, and the drive motor 6 protrudes outside the housing 2 and is detachably disposed on the drive transmission unit 5 (see FIG. 2).

  A pair of driven sprockets 9 which are composed of an upper sprocket 9a and a lower sprocket 9b having a vertically divided structure and are rotatable in the circumferential direction of the existing fluid pipe P are disposed at both ends of the guide portion 4.

  As shown in FIG. 5A, fixing rings 33 protrude from the both ends of the guide portion 4 around the outer periphery of the existing fluid pipe P. A recess that can be fitted to the fixed ring 33 is formed on the back surface of the driven sprocket 9, and the driven sprocket 9 is fitted to the fixed ring 33 so as to be slidable around the pipe axis of the existing fluid pipe P. .

  The back ring 32 is integrated with the driven sprocket 9 by a plurality of back locking bolts 40 on the back of the driven sprocket 9 fitted to the fixed ring 33 so that the driven sprocket 9 does not fall off the fixed ring 33. While being held, it can rotate around the pipe axis of the existing fluid pipe P.

  As shown in FIG. 4, the pair of driven sprockets 9 are respectively connected to the upper pair of drive sprockets 8 via a wound endless chain 10. By operating the drive motor 6 described above, a drive long shaft 106 to which the drive motor 6 is attached, an expansion joint portion 107 to which the drive long shaft 106 is detachably connected, and drive shafts 7 'and 7 are provided. The driving sprocket 8 is driven through this, and a rotational force is applied to the driven sprocket 9 by this driving, and the driven sprocket 9 goes around the outer periphery of the existing fluid pipe P.

  Further, the cutting units 3 are fixedly arranged at four locations at equal intervals on the outer surfaces of the pair of driven sprockets 9, and the outer periphery of the existing fluid pipe P can be rotated along with the rotation of the driven sprockets 9. The existing fluid pipe P can be cut around the outer periphery by the cutting tool 19. That is, the cutting unit 3 is attached to the guide portion 4 via the driven sprocket 9.

  The cutting unit 3 will be described in detail. As shown in FIGS. 3 to 5, the cutting unit 3 mainly includes the cutting bit 19 described above and a support member 18 that supports the cutting bit 19 in a fixed manner, and a rotating shaft. A stepping screw portion 20 that moves the cutting tool 19 and the support member 18 forward and backward in a radial direction of the existing fluid pipe P by rotating around O, and a step shown in FIG. A base member 14 provided with a rotating blade 21 fixedly mounted around the rotation axis O, a cylindrical opening U covering the stepping screw portion 20 along the outer peripheral direction, and an upper portion of the shaft member 17 of the lead screw portion 20; The plate member 14a, the shaft support member 15 fixedly connected to the base member 14 and rotatably inserted into the step screw portion 20, and the step screw portion 20 and the outer peripheral surface of the existing fluid pipe P are disposed. Cut from the existing fluid pipe P The protective member 16 that prevents entry of the stepping screw portion 20 into the stepping screw portion 20 and a spring body therein are provided, and the stepping screw portion 20 is pressed and urged to the fitting portion 35 by the elastic force of the spring body. And a load member 23 that suppresses the rotation.

  As shown in FIG. 5 (a), the cutting tool 19 is attached to the outer peripheral portion of the support member 18, and the mounting portion 19b extends to the existing fluid pipe P side. And a cutting part 19a for cutting the fluid pipe P. The plate member 14a is attached to the base member 14 with a screw 14c inserted through a long hole formed in the vertical direction (not shown), thereby covering an open portion (not shown) of the base member 14. Then, the plate member 14 a is moved along the elongated hole with respect to the base member 14, so that the opening portion is opened, and the cutting tool 19 can be attached to and detached from the support member 18. As shown in FIGS. 5A and 5B, the stepping screw portion 20 includes a shaft member 17 having a screw portion 17 a that is screwed into the support member 18.

  The rotary blades 21 are positioned at substantially equal intervals in the circumferential direction of the rotation axis O, extend radially around the rotation axis O, and can be in contact with and engaged with a kicker piece 31 of the kicker section 30 described later. 34 (12 in this embodiment) and a fitting portion 35 having a recess into which the load member 23 provided on the shaft support member 15 can be fitted.

  The radiating portion 34 is formed in a shape that gradually tapers in a direction away from the rotation axis O, and a contact surface 34a that contacts and engages a contact surface 31a of a kicker piece 31 described later is provided on the rotary blade 21. Regardless of the rotation around the rotation axis O, the shape is always formed in a simple shape located on a plane parallel to the rotation axis O. Further, as shown in FIG. 6, the cutting unit 3 is attached to the driven sprocket 9 so that the rotational axis O of the stepping screw portion 20 is positioned in the radial direction of the existing fluid pipe P (see the dashed line N in the figure). ). In addition, the code | symbol C in the figure has shown the tube axis | shaft of the existing fluid pipe P. FIG.

  As shown in FIG. 5A, the protective member 16 is a bendable bending member made of an elastic material such as rubber, and covers the opening U of the base member 14 and is a taper formed on the mounting portion 19b. It is attached to the base member 14 so as to come into contact with the cutting portion 19a in a state before coming into contact with the surface 19c.

  Further, the protection member 16 has a main body portion 16a fixed to the base member 14, and an abutting portion 16b that abuts on an attachment portion 19b that moves in the inner diameter direction. The contact portion 16b is formed by two incisions directed inward from one side of the protection member 16, and the contact portion can be bent with respect to the main body portion 16a (see FIG. 8). ).

  As shown in FIGS. 3 to 6, the kicker portion 30 has an abutment surface 31 a that abuts and engages at least in line contact with the abutment surface 34 a of the rotating blade 21 that rotates in the circumferential direction of the existing fluid pipe P. The kicker piece 31 arranged to rotate the stepping screw portion 20 around the rotation axis O together with the rotary blade 21 by the corresponding contact engagement, and supports the kicker piece 31 and is fixed to the guide portion 4. And a support portion 36 attached to the.

  The kicker piece 31 has a tip portion that gradually tapers toward the rotation axis O. The above-mentioned contact surface 31a is formed in a substantially flat shape at the tip portion, and the kicker portion 30 is positioned so that the contact surface 31a is positioned in the radial direction of the existing fluid pipe P as shown in FIG. Is fixedly attached to the guide portion 4 (see the dashed line M in the figure).

  The support portion 36 is disposed on the left and right of the upper guide 4a in FIG. 3 along the rotation path, and is fixed to the upper guide 4a by a plurality of screws 130, and a stepping screw of the kicker piece 31 described later. An adjustment portion 26 that adjusts the contact degree with respect to the portion 20; a contact position that will be described later in contact with the stepping screw portion 20 that rotates the kicker piece 31 in the circumferential direction of the existing fluid pipe P; An operating portion 25 is provided that is movable between a later-described retracted position that avoids contact engagement with the screw portion 20.

  The adjustment unit 26 mainly includes a moving member 121 that can move relative to the fixing unit 27, a housing member 125 that is fixedly attached to the moving member 121, and that partially accommodates the kicker piece 31, and presses the kicker piece 31. A cam member 123 that connects to the cam member 123, and a screw support member 128 that is fixedly attached to the moving member 121 and rotatably supports the screw member 127. The cam member 123 has an eccentric shape having a short diameter portion 123a and a long diameter portion 123b.

  As shown in FIG. 5B, the moving member 121 is formed with a plurality of elongated circular insertion holes 121a, which are formed in the insertion hole 121a and the fixing portion 27 corresponding to the insertion hole 121a. By inserting the bolt 122 integrally into a screw hole (not shown), the moving member 121 is fixed to the fixing portion 27 in a state where the bolt 122 is loosely fitted into the elongated circular insertion hole 121a. Therefore, with the configuration of the moving member 121, the adjustment unit 26 is supported so as to be movable with respect to the fixed unit 27.

  The moving member 121 is formed on the upper and lower sides of the fixed portion 27 and is fitted in guide portions 27a and 27a extending to the front side of the drawing. The moving member 121 is guided by the guide portions 27a and 27a. Thus, the position of the kicker piece 31 can be adjusted in the horizontal direction in the figure without being displaced in the vertical direction in the figure.

  The housing member 125 is formed with a housing hole 125a for housing a part of the kicker piece 31, and a ring member 124 is fixed to the housing member 125 on the right side in the drawing in the housing hole 125a. Is done. Further, inside the accommodating member 125, there is provided a slide groove 125b that slidably accommodates the convex portion 41 provided in the upper part of FIG. 5A of the kicker piece 31, and the convex portion 41 is provided in the slide groove 125b. , The kicker piece 31 is restricted from rotating around the axis and is movable in the axial direction.

  Further, as shown in FIG. 5B, the elastic member 24 is inserted between the ring member 124 and the ring-shaped retaining ring 126 fixedly attached to the kicker piece 31. Is placed.

  The cam member 123 is initially operated through the screw member 127 and the connecting piece 129 connected to the screw member 127, with the short diameter portion 123a abutting the illustrated left end portion of the kicker piece 31. Since the cam member 123 is rotated by rotating the operation unit 25 and the long diameter portion 123b of the cam member 123 is in contact with the kicker piece 31, the solid line kicker piece 31 is illustrated. It moves toward the right (see the dashed line in FIG. 5B).

  5B, the position of the kicker piece 31 that contacts the short diameter portion 123a of the cam member 123 is in contact with the radiation portion 34 of the rotary blade 21 of the stepping screw portion 20, as indicated by the solid line. The position of the kicker piece 31 that contacts the long diameter portion 123b of the cam member 123 is in contact with the rotary blade 21 of the stepping screw portion 20 as shown by the alternate long and short dash line. Is in position. In this contact position, the adjustment unit 26 can adjust the contact degree of the stepping screw unit 20 with the rotary blade 21.

  Further, as described above, since the elastic member 24 is disposed between the ring member 124 and the ring member 124 and the retaining ring 126, the operation unit is configured to move the kicker piece 31 from the retracted position to the contact position. By rotating 25, the retaining ring 126 of the kicker piece 31 approaches the ring member 124, and the elastic member 24 is held between the retaining ring 126 and the ring member 124.

  On the other hand, by rotating the operation unit 25 from the contact position of the kicker piece 31, the elastic return force of the elastic member 24 is applied to the retaining ring 126 so that the kicker piece 31 maintains the contact state with the cam member 123. The kicker piece 31 returns from the contact position to the retracted position by this elastic return force.

  Thus, in the vicinity of the rotation path of the cutting unit 3 that rotates in the circumferential direction of the existing fluid pipe P, the kicker portion 30 is fixedly disposed on the outer surface of the upper guide 4a. The kicker piece 31 provided with the contact surface 31a that makes at least line contact with the contact surface 34a of the radiating portion 34 of the rotary blade 21 rotating in the circumferential direction of the fluid pipe P is stepped together with the rotary blade 21. The screw portion 20 is arranged to rotate around the rotation axis O. Therefore, when the cutting unit 3 that rotates in the circumferential direction of the existing fluid pipe P (see the white arrow in FIG. 6) passes near the kicker portion 30, the contact surface 34 a of the radiating portion 34 of the rotary blade 21 is The rotating blades 21 are placed until the cutting unit 3 finishes passing through the vicinity of the kicker portion 30 and the engagement is released. It will rotate by a fixed amount (predetermined angle) (see FIGS. 6 and 8).

  Therefore, each time the cutting unit 3 rotates in the circumferential direction of the existing fluid pipe P and passes through the kicker portion 30, the radiating portion 34 of the rotary blade 21 of the stepping screw portion 20 contacts and engages with the kicker piece 31. Then, the cutting tool 19 fixedly supported by the support member 18 screwed into the screw portion 17a of the shaft member 17 of the stepping screw portion 20 moves in the inner diameter direction by an amount per unit, thereby cutting. The tip edge of the cutting tool 19 rotates the outer periphery while cutting the outer peripheral wall of the existing fluid pipe P by a certain amount to cut the existing fluid pipe P (see FIGS. 6 and 8).

  Further, as shown in FIG. 5B, when the radiating portion 34 of the rotating blade 21 is rotated by a predetermined amount by contact engagement with the kicker piece 31, the fitting portion 35 is similarly rotated by a predetermined amount, and the load member 23 is fitted into the recess of the fitting portion 35 that faces after the fitting portion 35 rotates by a predetermined amount. That is, since the fitting portion 35 is held by the load member 23 that is pressed and urged by the spring body after rotating by a predetermined amount, the cutting tool 19 similarly proceeds in the inner diameter direction of the existing fluid pipe P per unit. Held at a point.

  Therefore, when cutting the existing fluid pipe P, the force in the backward direction with respect to the cutting tool 19 due to the sliding contact with the outer wall of the existing fluid pipe P is received by the fitting of the load member 23 and the recess of the fitting portion 35. Therefore, the cutting position of the cutting tool 19 can be held without the rotating blade 21 rotating in the reverse direction.

  As a matter of course, since the concave portion formed in the fitting portion 35 and the radiating portion 34 are provided at the same predetermined angular interval, the radiating portion 34 becomes a kicker piece when the existing fluid pipe P is cut. Since the load member 23 is fitted in the facing concave portion at a point rotated by a predetermined amount by 31, the cutting tool 19 is securely held at the point moved by the unit amount given by the predetermined amount rotation. The

  Next, the arrangement of the tube cutting device 1 will be described. First, the upper sprocket 9a to which the cutting unit 3 is fixedly disposed so that the rotational axis O of the stepping screw portion 20 is positioned in the radial direction of the existing fluid tube P is described. Are attached to the upper guide 4a of the guide portion 4 and the lower sprocket 9b, to which the cutting unit 3 is fixedly disposed, is attached to the lower guide 4b of the guide portion 4. Then, the fixing portion 27 is fixedly attached to the upper guide 4a with a screw 130 so that the abutting surface 31a of the kicker piece 31 is positioned in the radial direction of the existing fluid pipe P (FIGS. 3, 4, and 6). reference). By attaching the fixing portion 27, the contact degree 31 a of the kicker piece 31 is in surface contact with the contact surface 34 a of the rotary blade 21 by adjusting the degree of contact of the kicker piece 31 with respect to the stepping screw portion 20 described later. Alternatively, they come into line contact and engage with each other.

  Thus, since the stepping screw part 20 is disposed so that the rotation axis O of the stepping screw part 20 is positioned in the radial direction of the existing fluid pipe P, the stepping screw part is replaced with the stepping screw part. Compared with the case where the rotary shaft of the rotary blade 21 is disposed so as to be located in a direction different from the radial direction of the existing fluid pipe, the rotary blade 21 is in contact with the contact surface 31a of the kicker piece 31 at least in line contact. The contact surface 34a of the radiation part 34 can be formed in a simple shape.

  Next, as shown in FIG. 1, the drive transmission portion 5 and the upper guide 4a of the guide portion 4 are attached to the lower guide 4b, and the bolts 28 provided on the upper guide 4a and the lower guide 4b (see FIG. 6). ) To fix the guide portion 4 to the existing fluid pipe P.

  Then, as shown in FIG. 7, the long diameter portion 123 b of the cam member 123 is brought into contact with the kicker piece 31 by operating the operation portion 25. Then, with the bolt 122 loosely connected to the moving member 121, the adjustment portion 26 is moved with respect to the fixed portion 27, the position of the kicker piece 31 is changed as appropriate, and the degree of contact of the kicker piece 31 with the stepping screw portion 20. Are adjusted (see FIG. 5A).

  Here, the adjustment of the contact degree of the kicker piece 31 with respect to the stepping screw portion 20 will be specifically described.

  As shown by the solid line in FIG. 7, the adjustment unit 26 adjusts the degree of contact of the kicker piece 31 with the stepping screw portion 20 by moving the kicker piece 31 forward and backward in the linear direction with respect to the stepping screw portion 20. The bolt 122 is tightened and the moving member 121 is fixed to the fixed portion 27. The contact position of the solid line kicker piece 31 shown in FIG. 7 is the contact position of the kicker piece 31 shown in FIGS. 9A to 9D. In FIG. 3 indicates a rotation direction in which the stepping screw portion 20 rotates the existing fluid pipe P in the circumferential direction. In this abutting position, the distance between the tip of the kicker piece 31 and the rotation axis O in the linear direction in which the kicker piece 31 moves forward and backward toward the rotation axis O is L (see FIG. 5A). .

  First, as shown in FIG. 9A, when the stepping screw portion 20 rotates in the rotation direction, the contact surface 31a of the kicker piece 31 comes into contact with the contact surface 34a of the radiating portion 34x at the beginning. As shown in FIG. 9B, the contact portion between the radiating portion 34x and the kicker piece 31 is changed by further rotating the stepping screw portion 20 in the rotation direction as shown in FIG. 9B. In other words, the abutting surface 31a of the kicker piece 31 is in line contact with the abutting surface 34a of the radiating portion 34x, and the rotary blade 21 rotates about the rotation axis O in the direction of the white arrow in FIG.

  And as FIG.9 (c) shows, the radiation | emission part 34a and the kicker piece 31 space apart because the stepping screw part 20 further rotates in the said rotation direction. As described above, the fitting portion of the stepping screw portion 20 is held by the load member that is pressed and urged by a spring body after rotating by a predetermined amount, so that the radiating portion 34x and the kicker piece 31 are separated from each other. At the same time, the load member is fitted into the recess of the fitting portion, and the rotating blade 21 stops rotating. That is, the rotary blade 21 rotates one pitch from the state shown in FIG.

  Next, as the cutting unit makes one rotation in the circumferential direction of the existing fluid pipe, as shown in FIG. 8D, the contact surface 31a of the kicker piece 31 and the contact surface 34a of the radiating portion 34y again. As a result of the surface contact and contact engagement at the beginning of contact, the rotary blade 21 rotates one pitch around the rotation axis O, that is, 30 °, and the radiating portion 34b and the kicker piece 31 are separated from each other. The load member is fitted into the recess of the fitting portion, and the rotating blade 21 stops rotating. Similarly, although not shown, when the cutting unit makes one rotation in the circumferential direction of the existing fluid pipe, the radiating portion 34z and the kicker piece 31 come into contact with each other, and the rotary blade 21 has one pitch (30 °) Rotate.

  That is, the adjustment unit moves the kicker piece 31 toward and away from the rotation axis O so as to have the separation dimension L, so that each time the cutting unit makes one rotation in the circumferential direction of the existing fluid pipe, the radiation unit 34 is rotated by one pitch, that is, the kicker piece 31 can be adjusted so as to sequentially abut and engage with the adjacent radiating portion and the radiating portion adjacent to the abutting engagement. The degree constitutes the first contact degree of the present invention.

  In this way, when the contact surface 31a of the kicker piece 31 comes into contact with the contact surface 34a of the rotary blade 21 at the beginning of contact, the contact surfaces 31a, The impact at the time of contact of 34a is softened, and the kicker piece 31 and the rotary blade 21 are not damaged.

  On the other hand, as shown in FIG. 7, the long diameter portion 123 b of the cam member 123 is brought into contact with the kicker piece 31 by the operation portion 25, so that the kicker piece 31 has a spacing dimension shorter than the spacing dimension L described above. Although the adjustment unit 26 is moved with respect to the fixing unit 27 so as to be arranged at the position of the dashed line, the adjustment unit 26 is fixed to the fixing unit 27 so that the radiation unit 34 rotates. Each time when the cutting unit 3 makes one rotation in the circumferential direction of the existing fluid pipe P, the radiating part rotates by two pitches, that is, the radiating part where the kicker pieces 31 are located every other one from the radiating part that has been in contact with the last time. The abutting engagement is performed sequentially. The contact degree of the kicker piece with respect to the stepping screw portion corresponds to the second contact degree.

  Each time the cutting unit 3 makes one rotation in the circumferential direction of the existing fluid pipe P, the cutting tool 19 moves and moves in the inner diameter direction by a predetermined amount corresponding to the number of rotations of the radiating portion 34. The pipe P is cut (see FIG. 8).

  After the adjustment of the first contact degree or the second contact degree, the kicker piece 31 is moved to the retracted position by operating the operation unit 25. Next, the endless chain 10 is wound around the driven sprocket 9 and the drive sprocket 8, a motor base (not shown) is connected to the drive shaft 7 ′, and the drive motor 6 is attached to the motor base. Then, the drive motor 6 is operated and the cutting unit 3 is trial-rotated in the circumferential direction of the existing fluid pipe P in an unloaded state, and it is confirmed whether there is any abnormality in the tension of the endless chain 10 (FIGS. 2 and 2). 3).

  After the trial rotation of the cutting unit 3, the motor base and the drive motor 6 are removed. Then, the upper case 2d of the housing 2 is attached to the upper part of the lower case 2e so as to surround the upper side of the existing fluid pipe P in the figure, and both cases 2d and 2e are fixed to the existing fluid pipe P. Then, packings 69, 69, push wheels Q, Q, and rubber rings 68, 68 are attached to the side openings of the upper case 2d and the lower case 2e, respectively, and the side openings are sealed (see FIG. 2).

  Next, as shown in FIG. 2, the on-off valve 2a is attached to the upper part of the upper case 2d. Then, water is applied to the inside of the housing 2, that is, the upper case 2d, the lower case 2e, and the on-off valve 2a, and a predetermined water pressure is applied, and a water pressure test inside the housing 2 is performed. After the water pressure test, the water in the housing 2 is drained, the work cylinder 11 is attached to the upper part of the on-off valve 2 a, and the lid 12 is attached to the upper part of the work cylinder 11.

  Then, the expansion joint 107 is connected between the drive shaft 7 ′ of the tube cutting device 1 disposed in the cutting portion K and the other end side of the drive long shaft 106 inserted through the insertion hole 12 a.

  Specifically, first, the expansion joint 107 is attached to the drive shaft 7 ′ of the tube cutting device 1, and the drive long shaft 106 into which the motor base 108 is inserted is inserted into the sealing material 112 and the insertion hole 12 a. In this state, one end side of the drive long shaft 106 extends outward from the work cylinder 11 and is exposed. Then, the expansion joint 107 and the drive long shaft 106 are connected, and the drive motor 6 is coupled to the motor base 108.

  Next, the tube cutting process will be described. The drive motor 6 is attached to the drive long shaft 106, and the drive motor 6 is operated to transmit the rotational driving force to the expansion joint portion 107 via the drive long shaft 106. By this transmission, as shown in FIG. 6, every time the cutting unit 3 rotates and the cutting unit 3 rotates in the circumferential direction of the existing fluid pipe P and passes through the kicker portion 30, the contact of the kicker piece 31 The surface 31a abuts and engages with the abutment surface 34a of the rotary blade 21 and rotates by a predetermined amount, that is, a predetermined angle, and the cutting portion 19a of the cutting bit 19 contacts the protective member 16 from the state of FIG. The support member 18 and the cutting tool 19 are moved in the inner diameter direction by an amount per unit in contact with the portion 16b. As the support member 18 and the cutting tool 19 are stepped, the leading edge of the cutting tool 19 comes into contact with the outer peripheral wall of the existing fluid pipe P, and the existing fluid pipe P is cut by a certain amount as shown in FIG. . By this cutting, the existing fluid pipe P is cut at two cut surfaces at the cut portion K, that is, a pipe piece (not shown) between the cut surfaces is cut off from the existing fluid pipe P.

  In this cutting, even if the abutting surface 31a of the kicker piece 31 abuts and engages with the abutting surface 34a of the rotary blade 21, the spring body of the load member 23 is increased even if the stepping screw portion 20 tries to rotate. Due to this elastic force, it is possible to prevent the amount of stepping of the cutting tool 19 from increasing per one rotation of the existing fluid pipe P in the circumferential direction without causing the stepping screw portion 20 to over-rotate.

  As described above, in the pipe cutting device 1 of the embodiment, the kicker piece 31 is in contact engagement with the contact surface 31a of the kicker piece 31 in line contact with the contact surface 34a of the rotary blade 21. Thus, the kicker piece 31 and the rotary blade 21 are brought into contact with each other with a sufficient contact amount by being arranged so as to rotate the stepping screw portion 20 around the rotary axis O together with the rotary blade 21. The stepping screw portion 20 can be reliably rotated by the contact engagement, and the cutting tool 19 can be stepped in the radial direction of the existing fluid pipe P.

  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 this embodiment, the fluid flowing inside the existing fluid pipe P is clean water, but the fluid is not necessarily limited to clean water, and may be, for example, industrial water, or in a gas or gas-liquid mixed state. The present invention can also be applied to a fluid pipe through which a fluid flows.

  Further, in this embodiment, the kicker unit 30 is fixedly attached to the non-rotating guide unit 4 in the vicinity of the rotation path of the cutting unit 3, but the attachment location of the kicker unit is not limited to this, for example, the kicker unit May be fixedly attached to the non-rotating housing in the vicinity of the rotation path of the cutting unit.

  In this embodiment, two kickers 30 are provided in the vicinity of one side of the rotation path, that is, a plurality of kickers 30 are provided, so that only one set of kicker 30 is provided in the vicinity of the one side of the rotation path. Compared with the case where the cutting unit 3 increases the amount of the cutting tool 19 that advances in the diameter direction per rotation that rotates along the circumferential direction of the existing fluid pipe P, it is necessary to cut the existing fluid pipe P. Although the number of rounds of the cutting unit 3 can be reduced, it is not always necessary that there are two types. For example, only one type may be provided according to the material of the existing fluid pipe P such as a ductile cast iron pipe or a steel pipe. And three or more types may be arranged.

  Further, in this embodiment, two kickers 30 are arranged in the vicinity of one side of the rotation path, so that each time the cutting unit 3 makes a round around the existing fluid pipe P, the two kickers 31 are used. The stepping screw portion 20 is driven twice. For example, only one kicker piece 31 is arranged at the contact position according to the material of the ductile cast iron pipe or steel pipe of the existing fluid pipe P, and the other kicker piece By arranging 31 at the retracted position, it is possible to adjust the amount by which the cutting unit 3 advances in the diameter direction of the cutting bite 19 per rotation that rotates along the circumferential direction of the existing fluid pipe P.

  Further, in this embodiment, the stepping screw portion 20 is disposed so that the rotation axis O of the stepping screw portion 20 is positioned in the radial direction of the existing fluid pipe P. The step screw portion may be disposed such that the rotation shaft of the step screw portion is located in a direction different from the radial direction of the existing fluid pipe.

  Further, in this embodiment, the kicker piece 31 is disposed so that the contact surface 31a of the kicker piece 31 comes into surface contact with the contact surface 34a of the rotary blade 21 at the beginning. For example, the kicker piece may be disposed so that the contact surface of the kicker piece comes into surface contact with the contact surface of the rotary blade while the rotary blade is rotating. . Further, the kicker piece may be arranged so that the contact surface of the kicker piece is in contact with the contact surface of the rotary blade only by line contact.

  Further, in the present embodiment, the fixing portion 27 is fixedly attached to the upper guide 4a with the screw 130 so that the contact surface 31a of the kicker piece 31 is positioned in the radial direction of the existing fluid pipe P. By adjusting the contact degree with respect to the stepping screw part 20, the contact surface 31a of the kicker piece 31 is in line contact with the contact surface 34a of the rotary blade 21 and is in contact engagement. Not limited to this, for example, the kicker piece can be rotated about its axis with respect to the support portion so that the abutting surface of the kicker piece is in line contact with the abutting surface of the rotary blade. It may be formed on a simple shaft piece.

  Specifically, as a modified example of the kicker portion 30 ′, as shown in FIG. 10, the kicker piece 31 is supported by the support portion so that the contact surface 31 a of the kicker piece 31 is positioned in the radial direction of the existing fluid pipe P. The rotation position is adjusted with respect to the axis 36 with respect to the axis 36 (see the chain line E shown in the figure).

  As shown in FIG. 11, a bolt hole is formed in the upper portion of the accommodating member 125, a bolt 131 is screwed into the bolt hole, and a neck lower portion of the bolt 131 is further formed in the ring member 124. By inserting the hole and pressing the kicker piece 31 downward in FIG. 11A, the rotation of the kicker piece 31 around the axis is restricted.

  In the tube cutting process, after the kicker piece 31 is moved from the retracted position to the contact position by the operation unit 25, the contact surface 31a of the kicker piece 31 contacts at least line contact with the contact surface 34a of the rotary blade 21. In order to engage, the kicker piece 31 is rotated around the axis with respect to the support portion 36 so that the contact surface 31a of the kicker piece 31 is positioned in the radial direction of the existing fluid pipe P, and the rotational position of the kicker piece 31 is rotated. Adjust. And after adjusting the rotation position of the kicker piece 31, the bolt 131 is screwed in and the rotation around the axis | shaft of the kicker piece 31 is controlled (refer FIG.10 and FIG.11).

  In this manner, the kicker piece 31 is a shaft piece whose rotational position can be adjusted around the axis with respect to the support portion 36, so that the abutment surface 31 a of the kicker piece 31 is made to the support portion 36 with respect to the guide portion 4. It is not necessary to accurately attach to the contact surface 34a of the rotating blade 21 in line contact with the contact surface 34a, and the contact surface 31a of the kicker piece 31 is rotated by rotating the kicker piece 31 with respect to the support portion 36. Can be adjusted to a position where they come into line contact with the contact surface 34 a of the rotary blade 21 and engage with each other.

DESCRIPTION OF SYMBOLS 1 Pipe cutting device 2 Case 2a On-off valve (opening part)
3 Cutting unit 4 Guide part (main part)
19 cutting tool 20 stepping screw part 21 rotary blade 23 load member 30, 30 'kicker part 31 kicker piece 31a contact surface 34a contact surface 36 support part K cutting part O rotating shaft P existing fluid pipe

Claims (4)

A pipe cutting device that has a split structure and has an opening that can be opened and closed, and that cuts a predetermined portion of the existing fluid pipe in a casing that watertightly surrounds the existing fluid pipe,
A main body fixedly attached to the existing fluid pipe, a cutting unit attached to the main body so as to be rotatable in the circumferential direction of the existing fluid pipe, and fixed to a predetermined non-rotating place in the vicinity of the rotation path of the cutting unit With a kicker part mounted, and
The cutting unit is connected to the cutting bit capable of cutting the peripheral wall of the existing fluid pipe along the circumferential direction, and is connected to the cutting bit, and rotates around the rotation axis to thereby cut the cutting bit into the diameter of the existing fluid pipe. A stepping screw part that advances and retreats in the direction, and a rotary blade fixedly attached around the rotation axis of the stepping screw part,
The kicker portion includes an abutment surface that is in line contact with and abuts with the abutment surface of the rotating blade that rotates in the circumferential direction, and the stepping screw portion together with the rotating blade by the contact engagement. A kicker piece arranged to rotate around the rotation axis, a support portion that supports the kicker piece and is fixedly attached to the non-rotating predetermined position, and gradually tapers toward the rotation axis. A front end portion, the abutting surface is formed in a substantially flat shape at the front end portion, and the kicker portion is attached to the fixed portion so that the corresponding contact surface is positioned in a radial direction of the existing fluid pipe, The radiating portion of the rotating blade is formed in a shape that gradually tapers in a direction away from the rotating shaft, and the adjusting screw portion of the support portion is attached to the fixed portion, whereby the stepping screw portion of the kicker piece Adjusting the degree of contact with In Ukoto, the kicker member is disposed so as to abut surfaces of the kicker piece abuttingly engages in line contact after surface contact with the original contact with the contact surface of the rotary blade A tube cutting device characterized by that.   The pipe cutting device according to claim 1, wherein the stepping screw part is arranged so that a rotation shaft of the stepping screw part is positioned in a radial direction of the existing fluid pipe. 3. The tube cutting device according to claim 1, wherein the kicker piece is a shaft piece that is adjustable relative to the support portion toward a rotation shaft of the stepping screw portion . 4.   The pipe cutting device according to any one of claims 1 to 3, wherein the cutting unit further includes a load member that suppresses the rotation of the stepping screw portion by a predetermined load.

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