JP2006110649A - Drilling device and drilling method for branch pipe connecting opening - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device for cutting an opening for connecting a branch pipe to an existing piping. <P>SOLUTION: This device machines an opening for connecting a branch pipe to a side wall of a cable storing pipeline. A cutter is mounted on a cylindrical sleeve 20 mounted on the cable storing pipe to come into rolling contact with the outer peripheral surface of the pipe, and moved according to the outer peripheral surface of the storing pipe to arbitrarily move a cutting portion of the cutter. A three-dimensional guide rail 18 is fixed to the cable storing pipe to guide and circulate the cutter 22 or the cutter mounting part, and the three-dimensional guide rail is formed like a three-dimensional shape according to the connecting opening of the branch pipe to be formed in the cable storing pipe, whereby the cutter can be moved according to the shape. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a drilling device and a processing method for a branch pipe connection opening, and more particularly to a branch pipe that opens a branch pipe in a synthetic resin pipe that is buried underground and accommodates wiring such as an optical cable. The present invention relates to a drilling apparatus for machining and a machining method.

  Generally, a power cable, a communication cable, etc. are accommodated in a conduit formed by a vinyl chloride pipe and are buried underground. In an existing pipeline that accommodates such a cable, there is a case where the cable is branched from a place other than a manhole or a handhole and a branch pipe is installed in the middle of the pipe constituting the existing pipeline. For example, in the trough / shared FA type electric wire common groove, the trough system cable and the shared FA (Free Access) system cable are connected and branched from the road, making it more compact and shallower. In the shared FA system, as shown in FIG. 11, the information communication / broadcasting backbone cable 1 is consolidated into one tube of the body tube 2, and the information communication / broadcasting lead-in cable 3 is integrated into one tube of the shared FA tube 4. It is supposed to be consolidated. In this case, construction for connecting the branch pipe 5 to the FA pipe is performed in order to draw the cable from the FA pipe to the user.

  In such construction, an opening drilling operation is first performed for digging the soil around the existing pipe line (FA pipe) to expose the pipe and attaching a branch pipe for drawing the cable to the pipe. Normally, the branch pipe connection opening is a long hole along the longitudinal direction of the pipe, and generally, a marking along the guide hole is provided along with a partially cylindrical marking board having a guide hole corresponding to the opening. Then, along the marking line, an opening for the branch pipe is formed by cutting the pipe with a blade such as a knife.

  However, since the above-mentioned pipes are usually densely embedded (several to dozens), even if the surrounding soil is dug and exposed, it is slightly around the pipe that forms the branch pipe opening. Only a small work space can be secured, and it is extremely difficult to form the opening by hand. Moreover, even though it is made of vinyl chloride, the tube has a thickness of 9.6 mm ± 0.7 mm, so it cannot be easily cut by hand using a knife or other cutting tool. For this reason, the tube must be warmed and softened. Although it is devised such as making incisions, work efficiency is poor. In particular, when a cutting tool such as a knife is used, there is a possibility of damaging the cable housed in the tube with the blade edge.

For this reason, a method has been proposed in which the template is fixed to the opening corresponding to the branch pipe opening, and the tube cutter is cut while moving the electric cutter along the guide hole that follows the opening formed in the template (patent). Reference 1). Also, band the gauge body in which the long hole corresponding to the template is also formed, wrap the chain around the existing pipe, attach the moving base with the horizontal base plate, and attach the blade of the cutting machine attached to the horizontal base plate There is also a configuration in which a moving base is moved so that the blade protrudes into the elongated hole and the blade moves along the elongated hole (Patent Document 2).
JP 2002-36019 A Utility Model Registration No. 3085414

  However, in the former processing method of the opening for connecting a branch pipe using the template, the guide long holes of the template having a partial cylindrical shape in close contact with the outer peripheral surface of the existing pipe are interrupted at two locations. There is a disadvantage that it cannot be cut and automated by a single operation. In particular, existing pipes are usually made of vinyl chloride pipes, so if an electric cutter is pressed during cutting, the pipe will bend in the direction of the cross section of the pipe, and the cut depth will change and cut into the cable housed inside. There was a very high risk of putting in.

  In the latter one described in Patent Document 2, the moving base is configured to hold a horizontal plate and a chain provided on the lower surface thereof around an existing pipe, and the moving base is three-dimensional in the pipe circumferential direction and the pipe axis direction. Smooth movement is not possible. In addition, since the chain is wound around the existing pipe and tightened, the existing pipe itself may be deformed into an irregular shape, and the cut depth cannot be kept constant.

  An object of the present invention is to provide an apparatus capable of cutting an opening for connecting a branch pipe to an existing pipe, paying attention to the above-described conventional problems. The second purpose is to provide a drilling device for a branch pipe connection opening that can be cut reliably within the range of the thickness of the existing pipe and does not cause a cutting accident such as cutting into the housing cable. To do.

  In order to achieve the above object, a branch pipe connection opening drilling apparatus according to the present invention is an apparatus for cutting a branch pipe connection opening in a side wall of an existing pipe, and is provided on an outer peripheral surface of the existing pipe. A cutting unit is provided that can move in the vertical and horizontal directions along the circumferential surface, and a three-dimensional solid guide rail similar in shape to the opening for connecting the branch pipe to be formed in the existing pipe is provided. It is characterized in that it can be moved around.

  In this case, the cutting unit includes a sleeve that can be mounted on the outer periphery of the cable housing tube via a bearing, and a cutting machine that is fixed to the sleeve and has a cutting blade directed toward the center of the sleeve. do it. The cutting unit is provided with a rotating ring, and the three-dimensional solid guide rail circumscribes the rotating ring, and the rotating ring is moved along the locus of the branch pipe connection opening edge. It is formed along the outer edge movement locus.

  Further, the cutting unit is disposed inside the three-dimensional guide rail, and the side surface of the existing pipe can be cut by moving the inner side surface of the three-dimensional guide rail as a guide surface. Alternatively, the cutting unit may be disposed inside the three-dimensional guide rail, and may be configured to be guided and moved by sandwiching the guide rail from the inside and the outside. The cutting unit may be provided with a drive wheel that is in rolling contact with the guide ring so that automatic cutting is possible.

  The present invention is an apparatus for processing an opening for connecting a branch pipe on a side wall of a cable housing pipe, and the cutting machine is mounted on a cylindrical sleeve mounted on the cable housing pipe and capable of rolling around its outer peripheral surface. A three-dimensional guide rail fixed to the cable housing pipe and capable of guiding the cutting machine or the cutting machine mounting portion is provided by moving along the outer peripheral surface of the housing pipe to arbitrarily move the cutting portion by the cutting machine. The three-dimensional guide rail can be configured to enable the copying movement of the cutting machine as a three-dimensional solid shape that follows the connection opening of the branch pipe to be formed in the cable housing pipe.

  A method for drilling a branch pipe connection opening according to the present invention is a method of processing a branch pipe connection opening on a side wall of a cable housing pipe, and the branch pipe connection opening in a state where a thin skin is left in advance on the side wall of the cable housing pipe. A branch pipe connection opening is formed by cutting a groove along the line and then punching a region surrounded by the cutting groove to break the thin skin.

  According to the above configuration, there is a cutting unit that can move vertically and horizontally along the outer peripheral surface of the existing pipe, and the cutting unit is moved around the three-dimensional solid guide rail that follows the shape of the branch pipe connection opening edge. Therefore, the drilling operation of the branch pipe connection opening can be completed by moving the cutting unit once around. Accordingly, the work can be performed by simply moving the cutting unit around the three-dimensional solid guide rail automatically or semi-automatically, so that workability is extremely high. In addition, since the cutting unit can be moved vertically and horizontally along the outer peripheral surface of the existing pipe by a cylindrical guide or the like, the pipe does not bend during cutting and the cutting depth can be kept constant. The tube meat can be cut by leaving one piece. Therefore, the cutting blade does not reach the cable accommodated in the interior, and there is no machining operation that causes damage to the accommodation cable, so that a highly safe drilling apparatus can be obtained.

Specific embodiments of a branch pipe connection opening drilling apparatus and method according to the present invention will be described below in detail with reference to the drawings.
Drawing 1 is a front sectional view showing the state where the drilling device concerning an embodiment was attached to a pipe line. In the common FA cable system, the information communication / broadcasting system main cable is put in the sheath tube and concentrated in the body tube 10, and the information communication / broadcasting system lead-in cable is consolidated in one tube of the common FA tube 12 in the basement. It is supposed to be buried. Normally, as shown in FIG. 1, the body tube 10 is disposed at a lower position, and the shared FA tube 12 is disposed immediately above. The cable is drawn into the user through the branch pipe attached to the side wall of the common FA pipe 12 by tilting it obliquely upward by 5 degrees to form the connection opening 14. Therefore, the work is performed in a state where the common FA pipe 12 is exposed by excavating the ground.

  The drilling device according to this embodiment is for cutting the connection opening of the branch pipe on the side wall of the common FA pipe 12 which is an existing pipe. A cutting unit 16 that can move along the peripheral surface is provided, and the cutting unit 16 can be moved around along a three-dimensional solid guide rail 18 that follows the shape of the opening for connecting the branch pipe.

  First, as shown in FIGS. 2 and 3, the cutting unit 16 includes a cylindrical sleeve 20 attached to the outer peripheral surface of the common FA pipe 12 and a cutting machine 22 fixed to the outer peripheral surface portion of the cylindrical sleeve 20. It has. The cylindrical sleeve 20 has a structure in which a plurality of ball bearings 24 are interspersed on the inner peripheral surface, and the cylindrical sleeve 20 rolls into contact with the outer peripheral surface of the common FA pipe 12 while maintaining a certain gap, and is formed on the pipe peripheral surface. It can be rotated and moved in the axial direction along the vertical and horizontal directions. In the case of the embodiment, a ball bearing 24 having a projection amount of about 3 mm from the inner surface of the cylindrical sleeve 20 is attached to secure a 3 mm gap between the 165.2φ common FA pipe 12 and the cylindrical sleeve 20. It is possible to roll. Further, the cylindrical sleeve 20 has a halved structure so that it can be attached to and detached from the common FA pipe 12, and the divided surfaces are joined together by bolting so that they can be attached to the outer periphery of the common FA pipe 12.

  A trimmer is used for the cutting machine 22 attached to the cylindrical sleeve 20, and a rod-like cutting blade (trimmer bit) 28 that is chucked to the tip shaft of the motor part 26 is attached. The cutting machine 22 is attached so that its rod-shaped cutting blade 28 faces the axial center direction of the cylindrical sleeve 20. For this reason, a cylindrical mounting portion 30 that protrudes outward along the radial direction of the sleeve is formed on one of the half sleeves, and is inserted into the cylinder of the cylindrical mounting portion 30 from the tip cutting blade 28 of the cutting machine 22 for cutting. The blade 28 is mounted so as to protrude from the inner surface of the cylindrical sleeve 20. Of course, it goes without saying that the sleeve located at the back of the cylindrical mounting portion 30 is penetrated and the cutting blade 28 can protrude. A base 32 for height adjustment is built in the bottom portion of the cylindrical mounting portion 30 so that the protruding length of the cutting blade 28 can be adjusted by contacting the front end surface of the cutting machine 22. If the pedestal 32 is made higher, the cutting depth by the cutting blade 28 becomes smaller, and if it is made lower, it becomes larger. The cylindrical mounting portion 30 is fixed to one half member of the cylindrical sleeve 20 by screws. When the cutting machine 22 is mounted, a so-called bayonet structure is employed in which positioning is performed by fitting a guide and a guide groove, the cutting machine 22 is inserted into a cylinder, and is prevented from coming off by rotating.

  Further, a plate 34 is fixed to the upper part of the cylindrical mounting portion 30, and two operation handles 36 are attached to the outer end surface of the plate by screwing. The operator can move the cutting unit 16 by holding the handle in his hand. Further, the cylindrical mounting portion 30 is provided with a rotating ring 40 via a bearing 38 positioned below the plate 34. The rotary ring 40 can be freely rotated by a bearing 38 and can roll on a guide rail described later.

  On the other hand, the drilling apparatus according to this embodiment is provided with a three-dimensional solid guide rail 18 having a shape similar to the opening edge of the branch pipe connection opening 14 to be formed in the common FA pipe 12, and the cutting unit 16 is provided with the cutting unit 16 described above. It is possible to move around along the three-dimensional solid guide rail 18. 4 and 5 show a plan view and a perspective view thereof. The three-dimensional solid guide rail 42 is fixed to the common FA pipe 12 via a rail fixture 44. The rail fixture 44 includes a semi-cylindrical body 46 having an inner diameter larger than the outer diameter dimension of the cylindrical sleeve 20, and a clamping ring that fixes the semi-cylindrical body 46 by tightening to the outer periphery of the common FA pipe 12 at both ends. 48 is provided. The fastening ring 48 has a two-part structure, and is fixed by fastening the cylindrical sleeve 20 by flange connection. An oval transmission window 50 is formed at the center of the semi-cylindrical body 46, and this is when the cutting unit 16 cuts the branch pipe connection opening 14 to be formed in the common FA pipe 12. It is sized so as not to interfere with the movable range.

  Such a rail fixture 44 is provided with the three-dimensional solid guide rail 42 as described above. This is a three-dimensional shape arranged around the oval transmission window 50 in the semi-cylindrical body 46. When the cutting blade 28 of the cutting unit 16 is traced at the edge of the branch pipe connection opening 14, the cutting is performed. The shape follows the locus of the outer edge of the rotating ring 40 provided in the unit 16. That is, the cutting unit 16 can be moved in a curved surface following the peripheral surface of the common FA pipe 12 by the cylindrical sleeve 20 with a bearing, and the center line of the rod-shaped cutting blade 28 is always on the central axis of the cylindrical sleeve 20 during the movement. It will be directed. During this movement, a three-dimensional solid guide rail 42 is formed so as to form a running surface of the rotating ring 40 and to have a shape similar to the opening 14 while the running surface is parallel to the cutting blade 28. It is doing. Accordingly, such a three-dimensional solid guide rail 42 has a three-dimensional shape that forms a continuous circular locus that moves in the axial direction and the circumferential direction on the virtual cylindrical surface.

  The cutting unit 16 is moved and moved along the three-dimensional solid guide rail 42. At this time, the cylindrical sleeve 20 is concentrically arranged with the common FA pipe 12, and therefore, the side wall of the common FA pipe 12 is cut by the cutting blade 28. The depth is always constant. As a result, when positioning the cutting machine 22 with the pedestal 32, by setting the cutting depth so as to leave a little wall thickness of the common FA pipe 12, it always left only one thin skin over the entire circumference of the cutting line. A cutting line can be formed. Thereby, the situation which cut | disconnects the cable accommodated in the common FA pipe | tube 12 can be prevented reliably. In particular, both sides of the movable range of the cutting unit 16 are fastened by the fastening ring 48 of the rail fixture 44 to ensure the circular shape of the common FA pipe 12, and the common FA is also provided between the fastening rings 48 by the cylindrical sleeve 20. Since the circular shape of the tube 12 is secured so that the shape of the common FA tube 12 is not bent and deformed, the cutting depth by the cutting machine 22 does not vary.

  In the branch pipe connection opening drilling device configured as described above, the cylindrical sleeve 20 in the cutting unit 16 is attached to the outer periphery of the common FA pipe 12 with the cutting machine 22 removed first. Then, the rail fixture 44 to which the three-dimensional solid guide rail 42 is fixed is put on the common FA pipe 12 in such a state that the cutting unit 16 is accommodated inside the transmission window 50, and tightening rings at both ends. Tighten and fix with 48. At this time, the branch pipe connection opening 14 has a specification that should be inclined 5 degrees upward from the side of the shared FA pipe 12, so that the fixed position is adjusted using a simple level or the like. After such assembly is completed, the cutting machine 22 is mounted on the cylindrical mounting portion 30 of the cylindrical sleeve 20. At this time, while holding the cutting machine 22, the side wall of the common FA pipe 12 is fixed and held while being drilled by the cutting blade 28. As a result, as shown in FIG.

  Next, holding the operation handle 36 and holding the rotating ring 40 against the three-dimensional solid guide rail 18, the cutting unit 16 is moved around the three-dimensional solid guide rail 42 to perform cutting. . As a result, as shown in FIG. 7, the cutting groove 52 following the branch pipe connection opening 14 is formed on the outer peripheral surface of the common FA pipe 12 while leaving the thin skin 54. And the opening 14 as shown in FIG. 8 is formed by hitting the site | part enclosed by the cutting groove 52 with a hammer. Finally, the branch pipe 56 shown in FIG. 9 is attached and the cable can be pulled in.

  As described above, according to the present embodiment, the cutting unit 16 can perform a revolving operation using the cylindrical sleeve 20, and the cutting depth does not change due to the bending deformation of the common FA pipe 12 that is a resin pipe. Therefore, the cutting groove 52 that follows the branch pipe connection opening can be formed with the thin skin 54 left in the tube wall, and the opening 14 that does not damage the housing cable in the shared FA pipe 12 can be formed. The effect is obtained. Chips are generated during the cutting process, but the cylindrical sleeve 20 has a clearance gap for the chips secured by the ball bearings 24, so that there is no problem in work due to the chips. Further, since the cutting unit 16 is disposed inside the three-dimensional solid guide rail 42, the body tube adjacent to the shared FA tube 12 can be processed without being in the way.

  Further, since the three-dimensional solid guide rail 18 is three-dimensionally formed at a position floating from the outer peripheral surface of the common FA pipe 12, it does not have a rail structure in close contact with the common FA pipe 12, and the cutting unit Since the operation of pressing the common FA tube 12 does not occur by the operation of 16, the tube is not deformed. Therefore, since the cutting depth of the cutting groove 52 is not changed, the cutting blade 28 does not penetrate the common FA tube 12 and the housing cable is not damaged, so that safety is high. The three-dimensional solid guide rail 42 is parallel to the cutting blade 28, and the fact that the pressing force on the guide does not act in the cutting depth direction also brings about an effect of keeping the cutting depth of the cutting groove 52 constant.

  By the way, in the said embodiment, although it has the structure which presses the cutting unit 16 against the three-dimensional solid guide rail 18, and makes it go around, as shown in FIG. 10, the three-dimensional solid guide rail 42 is located in the inner side. It is good also as a structure clamped with the engaging claw 58 located in the outer side and the rotating ring 40 to be carried out. By providing the bearing 60 inside the engagement claw 58, the movement is performed smoothly.

  If necessary, the rotating ring 40 can be automatically moved around as a moving wheel. As the driving force, the rotational power of the cutting machine 22 may be used.

  The drilling device for a branch pipe connection opening according to the present invention can be used for forming a branch pipe in an existing pipe, and can be used particularly for drawing an underground cable.

It is front sectional drawing which shows the attachment state to the pipe line of the drilling apparatus which concerns on this embodiment. It is a top view of the cutting machine used for this embodiment. It is a side view which shows the attachment state of the cutting unit applied to this embodiment. It is a top view of the three-dimensional solid guide rail used for this embodiment. It is a perspective view of the guide rail. It is a perspective view which shows the operation state of the drilling apparatus which concerns on this embodiment. It is a partial section perspective view of FA pipe cut by the processing device concerning an embodiment. It is a partial cross-sectional perspective view of the FA pipe in a state where the branch pipe connection opening is opened after being cut from the thin wall portion after the long hole is cut. It is a perspective view of the state where the branch pipe was attached to the connection opening of the FA pipe. It is a fragmentary front sectional view which shows the attachment state to the pipe line of the drilling apparatus which concerns on other embodiment. It is a perspective view for the arrangement state explanation of a common FA system buried pipeline.

Explanation of symbols

10 ......... Body tube, 12 ...... Common FA tube, 14 ...... Open for branch pipe connection, 16 ......... Cutting unit, 18 ...... 3D solid guide rail, 20 ...... Cylinder sleeve, 22 ......... Cutting machine, 24 ......... Ball bearing, 26 ......... Motor, 28 ......... Cutting blade, 30 ......... Cylinder mounting part, 32 ......... Pedestal, 34 ......... Plate, 36 ... ...... Operating handle, 38 .... Bearing, 40 .... Rotating ring, 42 .... 3D solid guide rail, 44 .... Rail fixture, 46 .... Semi-cylindrical body, 48 .... Tightening Ring, 50 ......... Oval transmission window, 52 ......... cutting groove, 54 ......... thin skin, 56 ......... branch pipe, 58 ......... engaging claw, 60 ......... bearing.

Claims (8)

  A device for drilling a branch pipe connection opening in a side wall of an existing pipe, provided with a cutting unit capable of moving along the outer surface of the existing pipe vertically and horizontally, and to be formed in the existing pipe A drilling device for a branch pipe connection opening, characterized in that a three-dimensional solid guide rail having a shape similar to the opening edge for pipe connection is provided, and the previous cutting unit can be moved around along the three-dimensional solid guide rail.   The cutting unit includes a sleeve that can be attached to the outer periphery of the cable housing tube via a bearing, and a cutting machine that is fixed to the sleeve and has a cutting blade directed toward the center of the sleeve. Item 2. A drilling device for a branch pipe connection opening according to Item 1.   A rotating ring is provided in the cutting unit, and the three-dimensional solid guide rail circumscribes the rotating ring and moves the outer edge of the rotating ring when the cutting blade is moved along the trajectory of the branch pipe connection opening edge. 2. The branch pipe connection opening drilling device according to claim 1, wherein the drilling device is formed along a trajectory.   2. The branch according to claim 1, wherein the cutting unit is disposed inside the three-dimensional guide rail, and the inner surface of the three-dimensional guide rail is moved as a guide surface so that a side wall surface of an existing pipe can be cut. 3. Drilling device for pipe connection openings.   2. The branch pipe connection opening drilling process according to claim 1, wherein the cutting unit is disposed inside the three-dimensional guide rail, and can be guided and moved by sandwiching the guide rail from the inside and the outside. apparatus.   2. The branch pipe connection opening drilling apparatus according to claim 1, wherein the cutting unit is provided with a drive wheel that is in rolling contact with the guide ring so that automatic cutting is possible. 3.   An apparatus for processing an opening for connecting a branch pipe on a side wall of a cable housing pipe, wherein a cutting machine is mounted on a cylindrical sleeve that is mounted on the cable housing pipe and can be brought into rolling contact with the outer peripheral surface thereof. A three-dimensional guide rail is provided that can be moved along the outer peripheral surface to freely move a cutting portion by the cutting machine and is fixed to the cable housing pipe and can guide the cutting machine or the cutting machine mounting portion around. A drilling device for a branch pipe connection opening, wherein the cutting machine can be moved in a three-dimensional shape following the connection opening of the branch pipe to be formed in the cable housing pipe.   A method of machining a branch pipe connection opening on a side wall of a cable housing pipe, in which a groove along the branch pipe connection opening line is cut in advance with a thin skin left on the side wall of the cable housing pipe, and then the cutting groove is used. A branch pipe connection opening drilling method, comprising: punching out an enclosed region to break the thin skin to form a branch pipe connection opening.

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