JP2006283945A - Active pipe branching joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an active pipe branching joint capable of eliminating the need of mounting a stopper for stroke adjustment even when main pipes with different diameters are eccentrically drilled, eliminating damage to the inside of the joint by the cutting blade part of a hole saw due to failure to mount the stopper and use of the stopper with errorneous size, and enabling the secure collection of chips. <P>SOLUTION: A bearing recessed part 40 capable of receiving the projected lower end part 25b of a vertical shaft 25 is formed on the inner bottom part 5a of a second split joint 5 facing a drilling operation hole 14 just below it at a position where the inner surface of the inner bottom part crosses the vertical axis X of the hole saw 20. When the projected lower end part 25b of the vertical shaft 25 is received onto the inside of the bearing recessed part 40 immediately after an eccentric drilled hole 33 is formed with the hole saw 20, a clearance c is formed between the cutting blade part 22a of the hole saw 20 and the inner surface of the inner bottom part 5a. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a live pipe branching joint for processing eccentric drilling in a main pipe by a punching machine in an embedded gas pipe or the like and connecting the main pipe and the branch pipe in a communicating manner.

  Examples of this type of live pipe branching joint include those shown in FIGS. 4 and 5 (see, for example, Patent Document 1). FIG. 4 is intended for a main pipe of the maximum diameter, and is a longitudinal front view of a state in which a hole saw of a drilling machine is set on a live pipe branching joint, and FIG. FIG. 6 shows a longitudinal front view of a state immediately after the eccentric perforation is formed in the tube, and FIG. 6 shows a state diagram in which the perforation operation port is closed after the eccentric perforation is formed. FIG. 7 is intended for a small-diameter main pipe. FIG. 8 is a longitudinal front view showing a state in which a hole saw of a drilling machine is set on a live pipe branching joint, and FIG. FIG. 9 shows a longitudinal front view in a state immediately after forming an eccentric perforation, and FIG. 9 shows a longitudinal front view in a state immediately after the eccentric perforation is formed in a small diameter main pipe by the hole saw of FIG.

  4 and 7, reference numeral 1 denotes a main pipe made of an iron pipe or cast iron pipe, 2 denotes a branch pipe made of a polyethylene pipe or the like, and 3 denotes a live pipe branch joint.

  The live pipe branching joint 3 includes a pair of first and second split joints 4 and 5 and fastening members such as a bolt 6 and a nut 7 that join the first and second split joints 4 and 5 together. The first split joint 4 includes a joint body 8 having an arcuate cross-section having a concave arc-shaped main pipe abutting surface 8 a that abuts one side of the circumference of the axial direction of the main pipe 1, and upper and lower ends of the joint body 8. The flanges 9 and 9 are provided with bolt holes 10 and 10 provided on the flanges 9 and 9.

  The second split joint 5 has a joint body 11 having a substantially inverted T-shaped tubular shape, and a concave arc-shaped main pipe contact opening that abuts on the other side of the circumference of the main pipe 1 at one end in the horizontal direction of the joint main body 11. 12 and a branch pipe connection port 13 at the other end in the horizontal direction, respectively, and a perforation operation port 14 is opened at the upper wall 11a in the middle part between the main pipe contact port 12 and the branch pipe connection port 13 of the joint body 11. ing. Bolts 6 and 6 are respectively implanted and fixed to upper and lower opening end surfaces of the main pipe contact port 12 of the second divided joint 5 facing the upper and lower flanges 9 and 9 of the first divided joint 4.

  In performing branch extraction using the live pipe branching joint 3 having the above-described configuration, as shown in FIG. 4, the main pipe contact surface 8 a of the first split joint 4 is arranged on one circumferential side of the main pipe 1. When the main pipe contact port 12 of the second split joint 5 is brought into contact with the other circumferential part at the same location of the main pipe 1, the first split joint 4 and the second split joint 5 are connected to the main pipe 1. A part in the axial direction is conjugated, the bolt 6 on the second split joint 5 side is inserted into the bolt through hole 10 on the first split joint 4 side, and the nut 7 is tightened on the tip of the bolt 6 to split the first and second parts. The joints 4 and 5 are fastened. At that time, a sealing material 15 made of rubber or the like is interposed between the inner surface of the main pipe contact port 12 of the second split joint 5 and a part of the circumference of the main pipe 1 so as to make airtight contact. Prevent leakage.

  When the first and second split joints 4 and 5 are attached, a part of the circumference (location to be drilled in the subsequent process) eccentric to the right side of the drawing from the vertical neutral surface HCL of the main pipe 1 faces below the drilling operation port 14. Is obtained. The pipe end into which the stiffener 16 of the branch pipe 2 is fitted is inserted through the O-ring 17 into the branch pipe connection port 13 of the second split joint 5. In this case, the biting teeth 18 provided on the inner periphery of the branch pipe connection port 13 bite into the outer periphery of the pipe end of the branch pipe 2 in a retaining manner.

As described above, the hole saw 20 of the punching machine is set via the shutter device 21 to the live pipe branching joint 3 attached to the main pipe 1 and the branch pipe 2.
The hole saw 20 includes a cylindrical main body 22 having a cutting edge 22a formed at the lower end, and a shaft 23 is concentrically and continuously connected to the center of an upper wall 22b of the cylindrical main body 22. The cylindrical main body 22 is positioned so as to be swingable via an elastic member 24 such as a vibration-proof rubber or a coil spring and is concentrically positioned with the cylindrical main body 22 by the elastic restoring force of the elastic member 24 at all times. A vertical shaft 25 is attached in a hanging manner. The elastic member 24 is interposed and fixed between the lower end portion of the shaft 23 and the upper end portion of the vertical shaft 25. A disc-shaped cutting piece holding member 26 made of hard rubber or resin is attached to the lower end portion of the vertical shaft 25. The cutting piece holding member 26 may be formed in a ball shape instead of the disk shape.

  The hole saw 20 is set in the punching operation port 14 of the second split joint 5 via the shutter device 21 and the punching cover 27. The perforated cover 27 is fixed upright on the opening / closing port portion 28 of the shutter device 21. The hole saw 20 is incorporated into the perforated cover 27. At this time, the lower end side of the shaft 23 of the hole saw 20 is penetrated upward from the center of the upper lid 27a of the perforated cover 27, and the lifting plate 29 is fixed to the upper end side of the shaft 23. The upper and lower ends of a plurality of lifting guide rods 30 arranged in parallel to the shaft 23 are fixed to the lifting plate 29 on the outer periphery of the shaft 23. The lower end side of each elevating guide rod 30 is slidably inserted through a through hole 31 formed in the upper lid 27a. A driving source 32 such as an electric motor is mounted on the elevating plate 29 and is connected to the upper end of the shaft 23 by transmission. The shaft 23 is rotationally driven by a drive source 32 and is moved up and down straight in the vertical direction by the guide action of the elevating guide rod 30.

Next, the procedure for forming the eccentric perforation in the main pipe 1 by the hole saw 20 set as described above will be described.
A drive source 32 such as an electric motor is connected to the upper end of the shaft 23 so that the hole saw 20 can be moved up and down in the perforated cover 27 and in the opening / closing opening 28 where the shutter device 21 is opened. As shown, the hole saw 20 is lowered in parallel with the vertical neutral surface HCL while being rotated at a position eccentric to the right side of the drawing from the vertical neutral surface HCL of the main tube 1. As the hole saw 20 is lowered, the cutting blade 22a comes into contact with the surface of the upper region of the horizontal neutral surface LCL of the main tube 1 to start cutting, and the cutting piece holding member 26 rubs against the surface of the region (FIG. 8).

  As cutting progresses in accordance with the lowering of the hole saw 20, the cutting piece holding member 26 descends while being in contact with the surface of the upper region of the horizontal tube LCL of the main tube 1, and resists the elasticity of the elastic member 24. The vertical shaft 25 is tilted radially outward of the main pipe 1 with the elastic member 24 as a fulcrum, and the cutting piece holding member 26 descends to a position corresponding to the horizontal neutral surface LCL of the main pipe 1, thereby cutting the cutting piece. The holding member 26 is eccentric from the vertical neutral plane HCL by the maximum eccentric amount, and reaches the position where the vertical shaft 25 swings at the maximum inclination angle.

  Further, as the hole saw 20 descends, the cutting piece holding member 26 descends while being in contact with the surface of the region below the horizontal neutral surface LCL, and the hole saw 20 together with the vertical shaft 25 by the elastic restoring force of the elastic member 24. Swing back on the vertical axis X. After the swinging of the vertical shaft 25 returns, the hole saw 20 descends while further rotating.

  As shown in FIG. 5, when the hole saw 20 descends while rotating, an eccentric perforation 33 is formed in the main tube 1. The cutting piece 34 generated by the formation of the eccentric perforation 33 is the cutting piece holding member 26. Is pressed against the inner surface of the peripheral wall of the cylindrical main body 22, and is securely held between the inner surface of the peripheral wall of the cylindrical main body 22 and the cutting piece holding member 26.

  When the formation of the eccentric perforation 33 is completed, the drive source 32 is removed from the shaft 23, and the hole saw 20 is pulled up into the perforation cover 27 by holding the lifting plate 29. The cutting piece 34 can be pulled up into the perforated cover 27 by pulling up the hole saw 20.

  Thus, after the hole saw 20 is pulled up, the opening / closing port portion 28 of the shutter device 21 is closed, so that the state in which the punching operation port 14 is temporarily sealed is maintained. Until the plug 35 is sealed, the fluid from the eccentric perforation 33 can be reliably prevented from leaking from the perforation operation port 14.

Next, the perforation cover 27 is removed from the perforation operation port 14 together with the hole saw 20 and the cutting piece 34.
Finally, as shown in FIG. 6, the plug 35 is screwed into the female screw 14a of the drilling operation port 14, thereby sealing the drilling operation port 14 and completing the connection operation. At this time, the space above the male screw 35 a of the main plug 35 and the inner periphery of the drilling operation port 14 are hermetically sealed by the main seal ring 36.

  Conventionally, in an active pipe branching joint as described above, in order to perform eccentric drilling of several main pipes with different pipe diameters by sharing the hole saw of one drilling machine, the drilling stroke of the main pipe with the largest diameter is used. When a drilling machine set in combination is used and the main pipe 1 having a smaller diameter is drilled, as shown in FIG. 7, the stroke length corresponding to the main pipe diameter is provided on the upper end side of the shaft 23 of the drilling machine. By adding a stopper (collar) 37 having a C-shaped cross section for adjusting the stroke having a different (size), the cutting blade portion 22a of the hole saw 20 is formed on the inner bottom portion 5a of the second split joint 5 immediately after drilling as shown in FIG. In order to prevent the inner surface from being scratched, it stops before the inner bottom portion 5a. FIG. 8 shows a state in which the eccentric perforation 33 is formed in the small-diameter main tube 1 by the hole saw 20.

JP 2003-336783 A

  However, in the above-mentioned live pipe branching joint to which the stopper 37 for adjusting the stroke is added, the stopper 37 may be forgotten to be attached or the size of the stopper 37 may be wrong. In this case, the inner bottom portion 5a of the second split joint 5 may be used. The cutting blade portion 22a of the hole saw 20 may come into contact with and be damaged.

  In view of the above, the present invention devised an inner bottom portion structure of the second split joint and an arrangement relationship between the inner bottom portion and the vertical axis in the active pipe branching joint having the cutting piece holding member on the vertical axis as described above. Therefore, it is not necessary to attach a stopper for adjusting the stroke even when eccentric bores with different diameters are drilled with a single common hole saw, and a hole saw cutting blade in the second split joint due to forgetting to attach the stopper or incorrect stopper size. It is an object of the present invention to provide a live-tube branching joint that does not damage the portion and enables reliable recovery of a cut piece.

The active pipe branching joint which is a premise of the present invention is configured as follows.
As in the case of the live pipe branching joint shown in FIG. 4, the eccentric perforation 33 is formed in a part of the circumference of the main pipe 1 and the main pipe 1 and the branch pipe 2 are communicated with each other via the eccentric perforation 33. A live pipe branching joint to be connected, wherein the live pipe branching joint includes a pair of first and second split joints 4 and 5 and a first and second split joints 4 that tie a part in the axial direction of the main pipe 1. , 5 are composed of fastening members 6 and 7 for joining together.

  The first split joint 4 has a concave arc-shaped main pipe abutting surface 8 a that abuts one side of the circumference of the main pipe 1 in the axial direction, and the second split joint 5 is one end in the horizontal direction of the joint body 11. The main tube 1 has a concave arc-shaped main tube contact port 12 that is in airtight contact with the other side of the circumference of the main tube 1 and a branch tube connection port 13 at the other end in the horizontal direction. A perforation operation port 14 is provided in the upper wall 11 a in the middle portion between the contact port 12 and the branch pipe connection port 13.

  As in the case of the hole saw 20 shown in FIG. 4, the drilling operation port 14 descends in parallel to the vertical neutral surface HCL while rotating at a position eccentric from the vertical neutral surface HCL of the main tube 1. A hole saw 20 is removably attached to the main pipe so that an eccentric perforation 33 is formed so as to face the branch pipe 2 by cutting off a part of the peripheral wall of the pipe 1. The cylindrical main body 22 is formed with a cutting blade 22a to be excised. The cylindrical main body 22 is oscillatable through the elastic member 24 in the cylindrical main body 22 and is always elastically restored by the elastic restoring force of the elastic member 24. A vertical shaft 25 is attached in a hanging manner so as to be positioned concentrically with the portion 22, and a cutting piece 34 generated by the formation of the eccentric perforation 33 is formed on the lower end side of the vertical shaft 25 with the inner surface of the peripheral wall of the cylindrical main body portion 22. Cutting piece to be clamped by collaboration It is mounted for relative rotation support member 26 about the axis of the vertical shaft 25.

In addition, the active pipe branching joint of the present invention is characterized in that it is configured as follows.
As illustrated in FIG. 1, a protruding lower end portion 25 b that protrudes downward from the lower surface of the cutting piece holding member 26 is formed at the lower end of the vertical shaft 25, and the drilling operation port 14 of the second split joint 5 is formed. A bearing which is an inner bottom portion 5a facing directly below, and is formed so as to be able to receive a protruding lower end portion 25b of the vertical shaft 25 at a location where an inner surface of the inner bottom portion 5a and an extension line of the vertical axis X of the hole saw 20 intersect. A recess 40 is provided, and when the projecting lower end 25b of the vertical shaft 25 is received in the bearing recess 40 after the cutting blade 22a has formed the eccentric perforation 33, the cutting blade 22a and the inner It is set so that a gap c is formed between the inner surface of the bottom portion 5a.

  In this case, the bearing recess 40 can be formed in a V-shaped section or an arc-shaped section.

  According to the live pipe branching joint having the above-described configuration, the protruding lower end portion 25b of the vertical shaft 25 is received in the bearing recess 40 immediately after the eccentric perforation 33 is formed by the hole saw 20, whereby the cutting blade portion of the hole saw 20 is obtained. 22a is formed so as not to come into contact with the inner bottom portion 5a by forming a gap c between the inner surface of the inner bottom portion 5a of the second split joint 5 and therefore, the cutting blade portion 22a causes the inner bottom portion 5a of the second split joint 5 to contact the inner bottom portion 5a. It can prevent being scratched.

  In particular, since the projecting lower end 25b of the vertical shaft 25 is received in the bearing recess 40 after the eccentric perforation 33 is formed, the vertical posture is reliably maintained without the vertical shaft 25 being tilted. Thus, it is possible to guarantee the reliable clamping and lifting of the cutting piece 34. For example, as in the comparative example shown in FIG. 3, if the inner bottom portion 5a of the second split joint 5 is not provided with a bearing recess and the inner bottom portion 5a remains flat, The protruding lower end 25b is vertical even when the cutting blade 22a does not damage the inner bottom 5a by contacting the flat inner surface of the inner bottom 5a before the cutting blade 22a contacts the inner bottom 5a. The shaft 25 may be inclined by the elastic member 24 and the cutting piece 34 may not be collected. Such a problem can be solved by providing the bearing recess 40 at a predetermined position of the inner bottom portion 5a of the second split joint 5.

  A preferred embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a longitudinal front view showing a live pipe branching joint according to an embodiment of the present invention in a state where a hole saw is set, and FIG. 2 is a live pipe branching joint of FIG. It is a vertical front view which shows the state immediately after.

  Members and elements other than the overall configuration of the live pipe branching joint according to the present invention, the inner bottom portion structure of the second split joint 5 and the arrangement relationship between the inner bottom portion and the vertical shaft 25 are shown in FIG. 4 described above. Since it is substantially the same as the live pipe branching joint shown, the same reference numerals are given and redundant description thereof is omitted.

Hereinafter, only the inner bottom structure of the second split joint 5 that is different from the live pipe branching joint shown in FIG. 4 and the arrangement relationship between the inner bottom and the vertical shaft 25 will be described.
As shown in FIG. 1, the inner bottom portion 5a facing directly below the drilling operation port 14 of the second split joint 5 where the inner surface of the inner bottom portion 5a and the extension line of the vertical axis X of the hole saw 20 intersect. Immediately after the eccentric perforation 33 is formed, a bearing recess 40 having a V-shaped cross section or an arc-shaped cross section formed so as to be able to receive the projecting lower end 25b of the vertical shaft 25 is provided. As shown in FIG. 2, when the projecting lower end 25 b of the vertical shaft 25 is received in the bearing recess 40 immediately after the eccentric perforation 33 is formed in the main pipe 1 by the hole saw 20, the cylindrical body 22 is cut. The projecting lower end 25b of the vertical shaft 25 is formed so that the cutting blade 22a of the hole saw 20 forms the eccentric perforation 33 so that a gap c is formed between the blade 22a and the inner surface of the inner bottom 5a. Prior to contacting the bottom portion 5a, the bearing recess 40 is set so as to be received.

  As described above, when the projecting lower end 25b of the vertical shaft 25 is received in the bearing recess 40 immediately after the eccentric perforation 33 is formed in the main pipe 1 by the hole saw 20, the cutting blade 22a comes into contact with the inner bottom 5a. Since there is no damage, the inner bottom 5a can be prevented from being damaged.

  Further, since the lower end 25b of the vertical shaft 25 is received in the bearing recess 40, the vertical shaft 25 is not tilted as in the comparative example of FIG. The upper cutting piece holding member 26 can reliably hold the cutting piece 34 between the inner surface of the peripheral wall of the cylindrical main body 22 of the hole saw 20 and reliably collect the cutting piece 34 as the hole saw 20 is pulled up. Can do.

It is a vertical front view which shows the coupling for live pipes of one Example of this invention in the state which set the hole saw. FIG. 2 is a longitudinal front view showing a state immediately after an eccentric perforation is formed in a main pipe by a hole saw in the live pipe branching joint of FIG. 1. It is a vertical front view which shows the malfunctioning state immediately after forming the eccentric perforation | punching in the main pipe with the hole saw about the joint for live pipe branching of a comparative example. It is a vertical front view which shows the joint for live pipe branching which made the main pipe of the maximum diameter of a prior art example into the state which set the hole saw of the drilling machine. It is a longitudinal front view which shows the state immediately after forming an eccentric drilling in the main pipe of the maximum diameter with the hole saw of FIG. It is a longitudinal front view which shows the state which fastened this plug to the drilling operation port after formation of eccentric drilling. It is a vertical front view which shows the joint for active pipe branching for the main pipe of the small diameter of a prior art example in the state which set the hole saw of the drilling machine. FIG. 8 is a longitudinal sectional front view showing a state in which an eccentric perforation is formed in a small diameter main pipe by the hole saw of FIG. 7. It is a vertical front view which shows the state immediately after forming eccentric drilling in the small diameter main pipe with the hole saw of FIG.

Explanation of symbols

1 Main pipe 2 Branch pipe 3 Live pipe branch joint 4 First split joint 5 Second split joint 6, 7 Bolt / Nut (fastening member)
8 Joint body 8a of the first split joint Main pipe contact surface 11 Joint body 11a of the second split joint Upper wall 12 of the joint body of the second split joint 12 Main pipe contact port 13 Branch pipe connection port 14 Drilling operation port 20 Hole saw 22 Cylindrical body portion 22a Cutting blade portion 24 Elastic member 25 Vertical shaft 25b Projecting lower end portion 26 Cutting piece holding member 33 Eccentric perforation 34 Cutting piece

Claims (1)

An active pipe branching joint that forms an eccentric perforation in a part of the circumference of the main pipe and connects the main pipe and the branch pipe in a communication manner via the eccentric perforation,
It consists of a pair of first and second split joints that tie a part in the axial direction of the main pipe and a fastening member that joins the first and second split joints,
The first split joint has a concave arc-shaped main pipe abutting surface that abuts on one circumferential side portion of the main pipe in the axial direction, and the second split joint is disposed at one end in the horizontal direction of the joint main body. The main pipe has a concave arcuate main pipe contact opening that is in airtight contact with the other side of the circumference of the main pipe and a branch pipe connection opening at the other end in the horizontal direction, and the main pipe contact opening and the branch pipe of the joint body It has a drilling operation port on the upper wall of the middle part between the connection ports,
The perforating operation port is rotated at a position eccentric from the vertical neutral surface of the main pipe while descending in parallel to the vertical neutral surface, whereby eccentric perforation is formed in a part of the peripheral wall of the main pipe in the branch pipe. A hole saw to be cut so as to face is detachably attached, and the hole saw is formed of a cylindrical main body portion having a cutting blade portion for cutting a part of the peripheral wall of the main tube at a lower end, and an elastic member is provided in the cylindrical main body portion. A vertical shaft is attached in a suspended manner so as to be swingable through and always positioned concentrically with the cylindrical main body by the elastic restoring force of the elastic member,
A cutting piece holding member that holds a cutting piece generated by forming the eccentric perforation in cooperation with the inner surface of the peripheral wall of the cylindrical main body at the lower end side of the vertical shaft can be relatively rotated around the axis of the vertical shaft. In the attached live pipe branch joint,
A projecting lower end projecting downward from the lower surface of the cutting piece holding member is formed at the lower end of the vertical shaft,
Receiving the projecting lower end portion of the vertical shaft at the location where the inner bottom portion of the second split joint faces directly below the drilling operation port and the inner surface of the inner bottom portion and the extension line of the vertical axis of the hole saw intersect It has a bearing recess that can be formed,
When the projecting lower end portion of the vertical shaft is received in the bearing recess after the cutting blade portion has formed the eccentric perforation, a gap is formed between the cutting blade portion and the inner surface of the inner bottom portion. An active pipe branching joint characterized by being set to

Images