JP4778378B2 - Drilling tool for branch joint - Google Patents

Description

  The present invention provides a branch hole on the side wall of the main pipe when the branch pipe is taken out from the main pipe using the branch extraction joint used for taking out the branch pipe from the existing pipe (main pipe) such as a resin pipe for city gas. The present invention relates to a drilling tool for a branch extraction joint to be opened.

  In order to make it easy to take out a branch pipe from a synthetic resin main pipe that is buried in the ground and in which gas flows in a gas pipe or the like, for example, an electric fusion type saddle joint (hereinafter referred to as an EF saddle type joint). Is attached to the main pipe, and the branch is taken out in a horizontal direction from a hole drilled vertically in the center of the main pipe. Since the conventional EF saddle type joint has a smaller take-out diameter than that of the main pipe, there is no need to perforate offset from the axis of the synthetic resin main pipe.

  On the other hand, in recent years, with an increase in gas demand, it has been required to connect a branch pipe of the same size to a resin main pipe by using an EF saddle type joint and to take out a large flow rate branch. . For example, Patent Document 1 has a saddle portion that is fused to the surface of a resin main pipe, a branch pipe portion that horizontally branches from the saddle portion in a direction perpendicular to the axis of the main pipe, and a perforated pipe portion that stands upright therebetween. The joint is equipped with a cutter with a blade-shaped or arcuate cross-section on the inner surface of the perforated tube, and the tip of the blade is pressed from the upright direction to the outer peripheral side of the main tube in the upright direction. The branch extraction joint which perforates so that it may notch, and its cutter are described. Patent Document 2 describes a branch extraction joint similar to Patent Document 1 except for the configuration of the cutter for punching. According to this configuration, in the cutter, a cutter support plate, a cutter plate whose both ends are fixed to the cutter support plate and bent in a curved cross section, and a blade portion formed at one end of the cutter plate are provided. The outer peripheral blade surface of the blade portion is gradually increased from both ends of the blade portion toward the center side, and the inner peripheral blade surface is conversely made smaller. Yes.

Japanese Patent Laid-Open No. 11-159683 (page 3, FIG. 1) JP 2001-88082 A (pages 3 to 4, FIGS. 1 and 7)

However, the branch joint described in Patent Documents 1 and 2 has the following problems. The main pipe that needs to be branched is a synthetic resin pipe (for example, polyethylene pipe), and the construction conditions range from below freezing in winter to about 40 degrees Celsius in summer. In particular, when the temperature rises to around 40 degrees Celsius, the synthetic resin tube softens. FIG. 19 shows a view when drilling is performed using the branch extraction joint having the configuration of Patent Document 2. 111 is a main pipe, and 100 is a branch extraction joint. By operating a drilling tool (not shown) attached above the branch extraction joint 100 (upward in the drawing), the cutter body 201 is lowered (downward in the drawing), cuts the side surface of the main tube 111, and cuts the cut piece C. . The cut piece C that has been cut off is stored in the cut piece storage portion 203 and is recovered again to the outside of the branch extraction joint 100 by operating a drilling tool (not shown). (Details of the drilling process will be described later.) Since the synthetic resin tube has a property of softening and increasing the elongation under high temperature conditions, if the drilling is performed in such a situation, the synthetic resin tube is stretched or deformed. In particular, as shown in FIG. 19, a large elongation occurs at a location where the cut piece C is finally cut, and the cut piece C cannot be completely separated from the main tube 111, so that there is a problem that reliable drilling cannot be performed. . When the cut piece C is left uncut, the cut piece C is temporarily stored in the cut piece storage unit 203. However, when the cut piece storage unit 203 is raised by an operation of a drilling tool (not shown), the cut piece C is cut into the cut piece storage unit 203. This causes a problem that the cut pieces cannot be collected. In order to collect the cut piece C that has fallen, a separate bypass pipe must be provided to cut off the gas and then the cut piece must be collected. Further, if the cutter body 201 is further moved into the back to cut the cut piece C, the cutter body 201 comes into contact with the joint body, and the joint body is damaged. In the worst case, a gas leakage accident may occur. .

Accordingly, an object of the present invention is to provide a drilling tool for a branch extraction joint that solves the problems of the conventional branch extraction work and enables a reliable and safe drilling operation.

A drilling tool for a branch extraction joint according to the present invention includes a saddle portion having an opening in a central portion that is applied to and fused to an outer surface of a side wall of a resin main pipe, and a hollow that protrudes outward from the saddle portion. A branch pipe connecting portion, and a cavity in which a cutter that cuts off the main pipe side wall located at the opening of the saddle portion and opens a branch hole in the side wall moves, and projects in a direction different from the branch pipe connecting portion. A punching tool that is attached to a branch extraction joint provided with a cutter moving part, and opens the main pipe branching hole, wherein one of the cutter, the cutter moving mechanism, and the cutter moving part of the branch extraction joint A shutter that opens and closes the cavity of the cutter moving portion, to which the side (joint side) is connected, and the moving mechanism that is connected to the other side (casing side) of the shutter A main body casing that supports the cutter movably through the moving mechanism, and transmits a cutting reaction force of the cutter to the inner wall of the cutter moving portion on the side opposite to the pipe, thereby preventing escape when the cutter is cut. comprising a cutter guide, and that the cutter is a plate body curved into a semi-cylindrical shape, and the cutter body cutter blade at one end edge is formed, of the cutter body back (curved inside of the plate member) And a back plate to which both side ends of the cutter body are connected, and the cutter guide rises from the surface toward both sides of the back surface of the back plate, and the legs A guide bar attached to a portion extending in a moving direction of the cutter, the guide bar hitting the inner wall of the cavity opposite to the counter pipe, and the inner wall receives a cutting reaction force of the cutter. And

  When using this drilling tool, first, the joint side of the closed shutter is connected to the cutter moving part of the joint. And a shutter is opened and the cavity of a cutter moving part and a main body casing are connected. And a moving mechanism is operated and a cutter is advanced toward the main pipe side in the cutter moving part of a coupling. As the cutter advances toward the main pipe, the cutter cuts into the main pipe side wall located at the opening of the saddle portion, and a cutout opening opened in the main pipe side wall after the cutting is completed becomes a branch hole. After cutting the main pipe side wall, the moving mechanism is operated to return the cutter together with the cut section toward the main body casing, and the cutter is drawn into the main body casing. And after a cutter passes a shutter, a shutter is closed and the exit of the cutter moving part cavity of a coupling is closed. Thereafter, after removing the main body casing from the shutter, a stopper plug tightening tool, which will be described later, is attached to the shutter, and the stopper plug is screwed into the outlet of the cutter moving section to seal the cutter moving section cavity of the joint.

  In the drilling tool for a branch joint according to the present invention, since the cutting reaction force of the cutter is transmitted to the inner wall on the opposite pipe side of the cavity of the cutter moving part, a cutter guide is provided to prevent escape when the cutter is cut. The cutter guide prevents the cutter from escaping to the opposite tube side when the cutter is cut, and the cutter can be cut at a desired position. In addition, since the cutter during the cutting operation goes straight, the cutting surface is smooth.

In the drilling tool for a branch extraction joint according to the present invention, the cutter is a plate-like body curved in a semi-cylindrical shape, a cutter body having a cutter blade formed at one end edge, and a back portion of the cutter body (plate body A back plate to which both end portions of the cutter main body are connected, and a clearance is provided at a connecting portion between the both end portions of the cutter main body and the back plate. It can be.
In this case, by providing the clearance, the cutter can be cut more smoothly when the main pipe side wall is cut off. Such a clearance is suitable for use in drilling a side wall of a relatively large diameter main pipe (such as 200A). In the case of a main pipe having a relatively small diameter (100A, 150A, etc.), both end portions of the cutter body and the back plate can be fixed by welding or the like.

In the branch extraction joint drilling tool according to the present invention, the cutter blade of the cutter body is formed in a triangular section that is inclined from the curved outer surface toward the curved inner surface in the vicinity of the central portion in the semicircular direction. In the vicinity of both ends in the semicircular direction, it is formed in a triangular shape that is inclined from the inner curved surface to the outer curved surface. It may be formed in a cross-sectional mountain shape that is inclined toward the thickness center.
Such a cutter blade is suitable for use in side wall drilling of a relatively large diameter main pipe (such as 200A). In the case of a relatively small diameter main pipe (100A, 150A, etc.), it can be formed in a cross-sectional mountain shape inclined from the curved inner and outer surfaces toward the end of the cutter body over the semicircular direction.

In the branch extraction joint drilling tool according to the present invention, a swingable holding plate (hinge) is attached to the inner surface of the back plate (the surface facing the cutter body), and the main pipe side wall is attached by the cutter. During the cutting, the holding plate hits the outer surface of the side wall of the main tube and falls to the inner surface side of the back plate. After the side wall of the main tube is cut by the cutter, the holding plate is moved to the inner surface of the back plate. It is possible to stand up and hold the cut piece in the space between the cutter body and the back plate.
In this case, since the holding plate falls to the inner surface side of the back plate during drilling, it does not interfere with the movement of the cutter. On the other hand, after drilling, the holding plate rises on the inner surface of the back plate and holds the section inside the cutter. Therefore, the section can be collected at the same time when the cutter is retracted toward the main body casing.

In the drilling tool for a branch extraction joint according to the present invention, a window through which the amount of movement of the cutter can be visually observed can be formed in the main body casing.
In this case, the amount of movement of the cutter can be confirmed from the outside of the main casing by looking through the window.

    ADVANTAGE OF THE INVENTION According to this invention, the problem of the conventional branch extraction operation | work can be solved, and the drilling tool for branch extraction joints which can perform a reliable and safe drilling operation | work can be provided.

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
First, the configuration of the branch joint according to the present invention will be described with reference to FIGS. 1 and 2.
FIG. 1 is a diagram showing a configuration of a branch extraction joint according to an embodiment of the present invention. (A) is a plan view, (B) is a side sectional view, and (C) is a left front view.
FIG. 2 is a cross-sectional view showing the overall structure (tool body and shutter) of the piping structure near the branch extraction joint and the branch joint drilling tool attached to the branch extraction joint according to the present embodiment.

  The branch extraction joint 100 shown in FIG. 1 is made of a thermoplastic plastic such as polyethylene. The branch extraction joint 100 includes a saddle portion 101 that is applied to the outer surface of the side wall of the existing pipe (main pipe) 111 shown in FIG. An opening 102 is formed at the center of the saddle portion 101. A heating wire (not shown) is embedded in the saddle portion 101. Current is passed through the heating wire to generate heat, and the saddle portion 101 is hermetically fused to the outer surface of the side wall of the main tube 111 (see FIG. 2). From the saddle portion 101, a branch pipe connecting portion 103 protrudes in the right direction of FIG. As shown in FIG. 2, the branch pipe 112 is connected to the branch pipe connecting portion 103 via the electric fusion socket 113.

  Furthermore, the cutter moving unit 105 protrudes from the saddle unit 101 in a direction orthogonal to the branch pipe connecting unit 103 (upward direction in FIG. 1B). The inside of the cutter moving unit 105 is a cavity 106. Inside the cavity 106 is a passage through which a cutter 41, which will be described in detail later, moves. The cavity 106 has an opening 106a at the upper end of the cutter moving unit 105 in the figure. A metal connection flange 108 is attached to the outside of the opening 106a. The connection flange 108 serves as a connection portion to which a shutter 61 described in detail later is connected. A stopper 107 is formed so as to protrude into the cavity 106 in the vicinity of the saddle portion opening 102 at the bottom 106 b (lower part in the figure) of the cavity 106 of the branch joint 100. As will be described in detail later, the stopper 107 plays a role of restricting movement of the section portion of the side wall of the main tube 111 to be cut by the cutter 41 in the cutter cutting direction.

  In FIG. 1B, the closing plug 130 disposed inside the cutter moving unit 105 is a member that closes the cavity 106 of the cutter moving unit 105 after drilling, and is inserted into the outer peripheral groove at the top of the closing plug 130. The upper end opening of the cutter moving unit 105 is sealed by the O-ring 109a. The structure and operation of the closing plug 130 will be described later in detail with reference to FIGS. The lid 122 fixed to the upper end opening of the cutter moving unit 105 with bolts and nuts is provided with an O-ring 109b provided in the groove on the upper end surface of the cutter moving unit 105, so that the branch joint 100 after drilling is airtight. As shown in FIG. 2, it is removed when the branch joint drilling tool 1 is used. Further, the O-ring 109b is also for ensuring airtightness between the shutter 61 or the adapter 150 and the branch extraction joint 100, which will be described later with reference to FIGS. Further, the belt 124 shown in FIGS. 1A and 1B spans the side wall of the main tube 111 when the saddle unit 101 is fused, and the saddle unit 101 is pressed against the main tube 111 to be in close contact therewith. Play a role.

Next, a branch joint drilling tool according to the present invention will be described with reference to FIGS. 2 and 3 to 7.
FIG. 3 is a diagram illustrating a configuration of a tool body of a branch joint drilling tool. (A) is the whole perspective view, (B) is the perspective view which looked at (A) from the lower side.
FIG. 4 is a view showing a cutter attached to the tool body of the branch joint drilling tool. (A) is a whole perspective view, (B) is a partial bottom view of (A) showing the connection state with the back plate of the cutter body as viewed from below.
FIG. 5 is a development view and a sectional view showing a cutter body (for large diameter) of the cutter of FIG. (A) is an inner development plan view, (B) is a development front view, (C) is an outer development plan view, and (D) to (H) are DD lines in (B), respectively. It is a HH line sectional view.

FIG. 6 is a development view and a sectional view showing another cutter main body (for small diameter). (A) is an inner developed plan view, (B) is a developed front view, (C) is an outer developed plan view, and (D) is a sectional view taken along line DD of (B).
FIG. 7 is a perspective view showing the configuration of the shutter of the branch joint drilling tool.
In the following description, the upper side, the lower side, the front side, and the back side refer to the upper side, the lower side, the front side, and the back side indicated by arrows in FIG. 2 unless otherwise specified. The front side is the right side of FIG. 2 (the side where the branch pipe extends), and the back side is the left side of FIG. 2 (the opposite side of the front side).

  2 shows a state where the main pipe 111 and the branch pipe 112 are connected via the branch extraction joint 100 shown in FIG. The branch extraction joint 100 has its saddle portion 101 applied to the outer surface of the side wall of the main pipe 111 and fused, and the branch pipe connection portion 103 is connected to the branch pipe 112 via the electric fusion socket 113. Yes. The drilling tool 1 is attached to the end of the cutter moving unit 105 above the joint 100 in the drawing. The drilling tool 1 includes a tool body 11 and a shutter 61. The tool body 11 and the shutter 61 are connected to each other by bolts and nuts as shown in FIG. A cutter 41 (see FIG. 4) is attached inside the tool body 11.

First, the tool main body 11 is demonstrated, referring FIG.2 and FIG.3.
The tool body 11 includes a cylindrical casing 13. The upper end of the casing 13 is closed by an upper plate 13a, and the lower end is an opening 13d. A flange 13 b is formed on the outer periphery of the lower end of the casing 13. The flange 13b is a portion that becomes a connection portion when the tool body 11 is connected to the shutter 61, and a plurality of bolt holes 13c are formed at predetermined intervals in the circumferential direction.

  As clearly shown in FIG. 3A, a display plate 15 is attached to a part of the outer peripheral surface near the upper end of the casing 13. The side to which the display plate 15 is attached is the front side of the casing 13, and when the drilling tool 1 is used, the display plate 15 is attached so as to face the direction in which the branch pipe 112 extends (see FIG. 2). An acrylic plate window 17 is attached near the lower end of the front surface of the casing 13 (below the display plate 15). Through this window 17, the inside of the casing 13 can be looked at, and the moving position of the cutter 41 and the presence of a section in the cutter 41 (section after cutting the side wall of the main tube 111) can be observed. Further, handles 19 are attached to the upper left and right sides of the outer peripheral surface of the casing 13 and the three front sides, respectively.

  A bush 21 is attached to the center of the casing upper plate 13a. A male screw is cut on the outer peripheral surface of the upper end of the bush 21. A shaft sleeve 23 is slidably passed through the bush 21, and a feed screw shaft 29 is passed through the shaft sleeve 23. A cylindrical handle block 24 is attached to the upper ends of the shaft sleeve 23 and the feed screw shaft 29. A pair of handles 25 extending in the lateral direction are attached to the side surfaces of the handle block 24. The handle 25 is for grasping by hand when the shaft sleeve 23, the feed screw shaft 29, and the cutter 41 attached to the shaft 29 are slid up and down.

  As shown in FIG. 2, an upper inner recess 24a and a lower inner recess 24b are dug in the upper and lower end surfaces of the handle block 24, respectively. In the upper inner recess 24a, a flange 23a at the upper end of the shaft sleeve 23, a flange 29a near the upper end of the feed screw shaft 29, and a thrust bearing 22 are arranged in this order from the lower side. An upper plate 24c is screwed to the upper end of the upper inner recess 24a. A hexagonal portion 29b at the upper end of the feed screw shaft 29 protrudes from the center of the upper plate 24c. On the other hand, a female thread that meshes with the male thread of the bush 21 is cut on the inner peripheral surface of the lower inner recess 24b. With the above configuration, both the shaft sleeve 23 and the feed screw shaft 29 are rotatably supported by the handle block 24. The feed screw shaft 29 rotates by engaging and turning a tool such as a spanner on the hexagonal portion 29b at the upper end (see FIGS. 11 and 12 described later).

  As shown in FIG. 2, a slide stopper 27 (upper side) and an anti-sway collar 28 (lower side) are engaged and fixed to the outer periphery of the feed screw shaft 29 located at the lower end of the shaft sleeve 23 in the casing 13. . The slide stopper 27 hits the lower end surface of the bush 21 when the handle block 24 is pulled up. Further, the slide stopper 27 engages with a lock bar 31 to be described later and plays a role of locking the shaft sleeve 23, the feed screw shaft 29 and the cutter 41 in a lifted state (the state shown in FIG. 2). When the shaft sleeve 23, the feed screw shaft 29, and the cutter 41 are lowered, the steady rest collar 28 engages with a steady rest member 34 described later (see FIG. 11 described later). The steadying collar 28 plays a role of steadying the feed screw shaft 29 at the time of drilling.

  A lock bar 31 is attached to the upper end of the rear surface of the casing 13 (the surface on the side opposite to the display plate 15). The lock bar 31 is screwed so as to penetrate the side surface of the casing 13, and a circular plate 31 a is formed at the outer end portion thereof. As shown in FIG. 2, in order to lock the shaft sleeve 23, the feed screw shaft 29 and the cutter 41 in the raised state, the lock bar 31 is screwed in a state where the slide stopper 27 is in contact with the upper plate 13 a of the casing 13. The tip 31 b of the bar 31 is engaged with the step portion of the slide stopper 27.

  As shown in FIGS. 2 and 3B, a band-shaped cutter guide 33 and a U-shaped steadying member 34 are attached to the inside of the casing 13. The belt-shaped cutter guide 33 engages with the inside of the slide portion 53 of the cutter 41, which will be described in detail later, and serves as a guide and a steady stop when the cutter 41 is moved (see FIGS. 9 to 13 described later). As described above, the U-shaped steady member 34 engages with the steady collar 28 when the shaft sleeve 23, the feed screw shaft 29, and the cutter 41 are lowered (see FIG. 11 described later). The steadying member 34 plays a role of steadying the feed screw shaft 29 when the cutter 41 is cut.

Next, the cutter 41 will be described with reference to FIG. 2 and FIGS.
The cutter 41 is attached to the feed screw shaft 29 of the tool body 11 described above, and moves in the vertical direction as the feed screw shaft 29 rotates. As shown in FIG. 4, the cutter 41 includes a cutter body 43 that is a plate body curved in a semicylindrical shape. A cutter blade 42 is formed on the lower end edge of the cutter body 43. The cutter blade 42 is formed in a triangular shape that is inclined from the curved outer surface toward the curved inner surface in the vicinity of the central portion 42a in the semicircular direction (FIG. 5F). In the vicinity of both end portions 42b, the cross section is formed in a triangular shape inclined from the inner curved surface to the outer curved surface (FIGS. 5D and 5H). The portion 42c is formed in a cross-sectional mountain shape that is inclined from both the curved inner and outer surfaces toward the thickness center. (Fig. 5 (E), (G))

  Note that the cutter blade 42 shown in FIG. 5 is suitable for use in drilling a relatively large diameter main pipe (200A or the like). As shown in FIG. 6, the cutter blade 42 ′ of the cutter body 43 ′ applied to the main pipe (100A, 150A, etc.) having a relatively small diameter is directed from the curved inner and outer surfaces toward the end of the cutter body over the semicircular direction. It is also possible to form an inclined cross-sectional mountain shape.

  Returning to FIG. 4, both end portions of the cutter main body 43 are bent portions 44 that are bent inward, and a back plate 45 is disposed inside the bent portions 44. A backing plate 46 is applied to the back side of each bent portion 44. And these are screwed so that each bending part 44 may be pinched | interposed between each pad 46 and the backplate 45. As shown in FIG. Here, as shown in detail in FIG. 4B, an appropriate clearance S is provided between each bent portion 44 and the back plate 45 and the backing plate 46, and the cutter body 43 is bent. The portion 44 can be bent by the clearance S between the end portion of the back plate 45 and the upper wall portion of the backing plate 46. By providing such a clearance S, the cutter 41 moves more smoothly when the side wall of the main pipe 111 is cut off. Such a clearance S is preferably provided in a cutter used for drilling a relatively large diameter main pipe (200A or the like) as shown in FIG. In the case of a relatively small diameter main pipe (100A, 150A, etc.) as shown in FIG. 6, both end portions of the cutter body and the back plate can be fixed by welding or the like.

  A pair of cutter guides 47 are attached to both sides of the back surface of the back plate 45. Each cutter guide 47 includes a leg portion 47a rising from the back surface of the back plate 45, and a guide bar 47b attached to the leg portion 47a. A reinforcing bar 47c is bridged between the left and right legs 47a. As shown in FIG. 17 to be described later, the cutter guide 47 transmits the cutting reaction force of the cutter 41 to the opposite pipe side inner wall 106X of the cavity 106 of the cutter moving unit 105, and comes off the axis of the original pipe when the cutter 41 is cut. It plays a role in preventing escape in the direction.

  Two long holes 45 a are formed in the back plate 45. These long holes 45a are holes for checking through the window 17 (see FIG. 3 etc.) of the casing 13 whether or not the section C is held inside the cutter 41 after the side wall of the main pipe 111 is drilled. . Further, a female screw block 51 extends from the upper end of the back plate 45 (see also FIG. 2 and the like). The female screw block 51 is formed with a female screw 51a. The female screw 51a meshes with the feed screw shaft 29 described above. A stop collar 35 shown in FIGS. 2 and 3B is fastened to the lower end of the feed screw shaft 29. A slide part 53 extends from the female screw block 51. The slide portion 53 has a U-shaped cross section that can be engaged with the outside of the belt-like cutter guide 33 described above, and serves as a detent when the cutter 41 is moved.

  A swingable holding plate (a hinge with a spring) 55 is attached to the lower end of the inner surface of the back plate 45 (the surface facing the cutter body). While the side wall of the main tube 111 is being cut by the cutter 41, the holding plate 55 hits the outer surface of the side wall of the main tube and falls to the inner surface side of the back plate 45 (see FIGS. 10 to 11 described later). And after cutting off the side wall of the main pipe 111 with the cutter 41, it rises on the inner surface of the back plate 45 and holds the cut piece C in the space between the cutter body 43 and the back plate 45 (FIG. 11 described later). (See FIG. 12)

Next, the shutter 61 will be described with reference to FIGS. 2 and 7.
The shutter 61 is attached between the cutter moving part 105 of the joint 100 and the casing 13. This shutter 61 opens the cavity opening 106a of the joint cutter moving part 105 at the time of cutter cutting shown in FIGS. 10 to 12 described later, and secures a vertical movement path of the cutter 41 in the tool body 11. After the cutting of the cutter shown in FIG. 13 is completed, the cavity opening 106a is closed to prevent the gas flowing out from the branch hole 111X drilled in the main pipe 111 from leaking out of the cavity opening 106a. Further, after the closing plug fastening operation shown in FIGS. 14 and 15 is completed, it is removed from the joint cutter moving unit 105 as shown in FIG.

  As shown in FIG. 7, the shutter 61 includes a main body 63 in which a pair of oval flat plates are overlapped. The main body 63 is provided with a circular through hole 64. Ring-shaped flanges 65 </ b> A and 65 </ b> B are formed on the upper and lower peripheral edges of the through hole 64, respectively. An O-ring 66 is attached to the inner end edge of the flange 65A. As clearly shown in FIG. 2, there is a slight space 63a between a pair of flat plates forming the main body 63, and a shutter plate 67 is rotatably disposed therein. The shutter plate 67 is integrally fixed to a rotating shaft 68 shown in FIG. The end of the rotating shaft 68 is a hexagonal portion 68a with which a tool such as a spanner is engaged.

  On the side of the rotating shaft 68, an instruction bar 69 extends laterally from the lower side of the hexagonal portion 68a. On the upper surface of the main body 63, indication points 63O and 63C are printed. When the tip of the instruction bar 69 is aligned with the instruction point 63O, the shutter plate 67 is opened and the through hole 64 is opened. Conversely, when the tip of the instruction bar 69 is aligned with the instruction point 63C, the shutter plate 67 is closed and the through hole 64 is closed. When the shutter plate 67 is fully closed, the instruction bar 69 does not turn after a “click” feel.

Next, with reference to FIG. 8, a closing plug fastening tool for closing the cutter moving portion 105 of the branch extraction joint 100 according to the present embodiment will be described.
FIG. 8 is a diagram showing a configuration of a closing plug fastening tool of the branch outlet joint according to the present embodiment. (A) is the whole perspective view, (B) is the perspective view which looked at (A) from the lower side.
As will be described later with reference to FIGS. 14 to 16, the closing plug tightening tool 81 is a tool for tightening the closing plug 130 to the cutter moving portion 105 of the branch extraction joint 100 after completion of the drilling operation.

  As shown in FIG. 8, the closure plug fastening tool 81 includes a short cylindrical main body 83. The upper end of the main body 83 is closed by an upper plate 83a, and the lower end is an opening 83d. A flange 85 is formed on the outer periphery of the lower end of the main body 83. The flange 85 is a portion to be a connection portion when the closing plug fastening tool 81 is connected to the shutter 61, and a plurality of bolt holes 85a are formed at predetermined intervals in the circumferential direction. A shaft 87 is slidably passed through a bush 82 through a central portion of the upper plate 83a of the main body 83.

  Near the upper end of the shaft 87, a pair of handles 89 extending in the lateral direction are attached via a connection fitting 88. A mark 87 a is marked on the circumferential surface of the shaft 87 below the handle 89. When the shaft 87 is rotated until the mark 87a is near the bush 82 and the closing plug 130 is pushed into the cutter moving portion 105 of the branch joint 100, the tightening of the closing plug 130 is completed. That is, the mark 87a is for visually confirming the completion of tightening of the closing plug 130.

  A stopper 91 is attached in the vicinity of the bush 82 on the upper plate 83 a of the main body 83. The pin 91 a of the stopper 91 is inserted into a pin hole 87 b (see FIGS. 14 to 16) formed near the lower end of the shaft 87. When the pin 91a is inserted into the pin hole 87b, the shaft 87 is prevented from sliding into the main body 83. A closing plug collar 93 is attached to the lower end of the shaft 87 inside the main body 83. The stopcock collar 93 is a square plate, and plungers 94 are attached to two opposing side surfaces. The stopper plug collar 93 engages with a square recess 130a on the upper end surface of the stopper plug 130, and each plunger 94 enters a groove on the side surface of the recess 130a. The closing plug collar 93 serves to hold the closing plug 130 with respect to the closing plug tightening tool 81 and to transmit the rotation of the shaft 87 to the closing plug 130 at the time of tightening.

Next, a series of operations for taking out the resin branch pipe using the branch extraction joint having the configuration of FIG. 1 will be described mainly with reference to FIGS.
FIG. 9 is a cross-sectional view showing a state at the time of disclosing the drilling work in the branch pipe removing work.
FIG. 10 is a cross-sectional view showing a state where the cutter is being pushed down during the drilling operation (just before cutting).
FIG. 11 is a cross-sectional view showing a state at the end of the cutter cutting in the drilling operation.
FIG. 12 is a cross-sectional view showing a state in which the cutter (and section) is being lifted and moved during the drilling operation.
FIG. 13: is sectional drawing which shows the state at the time of completion | finish of the cutter raising of the said drilling operation | work.
FIG. 14 is a cross-sectional view showing a state at the time of the work disclosure of the closing plug mounting work in the branch pipe taking-out work.
FIG. 15: is sectional drawing which shows the state at the time of the closure plug screwing of the closure plug installation work.
FIG. 16: is sectional drawing which shows the state at the time of the completion | finish of work of the closure plug mounting | wearing work.
FIG. 17 is a plan view showing a state of the cutter disposed in the cutter moving part of the branch extraction joint.

(1) Start of drilling operation As shown in FIG. 9, the shutter 61 is placed on the upper side of the cutter moving part 105 of the branch extraction joint 100, and the connection flange 108 on the joint 100 side and the lower flange 65 </ b> B of the shutter 61 are not shown.・ Connect with nuts. Further, the tool main body 11 is placed on the upper side of the shutter 61, and the upper flange 65A of the shutter 61 and the flange 13b of the casing 13 are coupled with bolts and nuts (not shown) (the main body 11 and the shutter 61 are connected in advance). Also good). Then, the connecting shaft 68 (see FIG. 7) of the shutter 61 is rotated with a spanner or the like, and the tip of the indication bar 69 is aligned with the indication point 63O to open the shutter plate 67.

(2) Moving the cutter down (just before cutting)
As shown in FIG. 10, after the shutter plate 67 of the shutter 61 is completely opened, the lock bar 31 is turned and pulled out to the front side, and the engagement between the tip 31b of the lock bar 31 and the slide stopper 27 is released. Then, the shaft sleeve 23, the feed screw shaft 29 and the cutter 41 are slid down. Here, when pulling out the lock bar 31, the lock bar 31 is turned and loosened while holding the handle 25 of the handle block 24 by hand so that the shaft sleeve 23, the feed screw shaft 29 and the cutter 41 do not descend by their own weight. After the shaft sleeve 23, the feed screw shaft 29 and the cutter 41 are lowered, the female screw on the outer surface of the bush 21 at the upper end of the casing 13 is engaged with the female screw on the inner surface of the lower inner recess 24b of the handle block 24, and both are screwed together.

(3) Cutting the cutter → cutting end As shown in FIG. 11, when a tool T such as a spanner is engaged with the hexagonal portion 29b at the upper end of the feed screw shaft 29 and rotated to the right (clockwise), the left-hand thread processing is performed. The cutter 41 screwed into the feed screw shaft 29 is lowered while being guided by the cutter guide 33, and cut into the side wall of the main pipe 111 positioned at the saddle portion opening 102 of the branch extraction joint 100. While the cutter 41 is cutting the side wall of the main tube 111, the holding plate 55 (see FIG. 4A) at the lower end of the cutter 41 is pushed upward on the outer surface of the side wall of the main tube, and the inner surface of the back plate 45 Since it falls to the side, it does not interfere with the cutter 41 moving forward.

  Here, as shown in FIG. 17, in the cutter 41 that has entered the joint cutter moving unit 105, the guide bar 47 b of the cutter guide 47 hits the counter pipe inner wall 106 X of the cavity 106, and the cutting reaction force of the cutter 41 is counteracted. The main pipe side inner wall 106X receives. And the escape to the direction away from the main pipe 111 at the time of cutting of the cutter 41 is prevented, and since the cutter 41 during the cutting operation goes straight, the cut surface of the side wall of the main pipe 111 is smooth. Furthermore, since an appropriate clearance S is provided between each bent portion 44 of the cutter 41 and the back plate 45 and the backing plate 46 (see FIG. 4B), the cutting movement of the cutter 41 is smoother. become.

The operator can know the end of cutter cutting by either of the following.
(A) Feel when the lower end of the female screw block 51 of the cutter 41 hits the stop collar 35 at the lower end of the feed screw shaft 29 and the cutter 41 stops moving further and stops rotating.
(A) The inside of the casing 13 is looked into from the window 17 and confirmed by observing that the upper end surface of the cutter 41 is below the mark M formed on the cutter guide 33.

  The section C generated by cutting the side wall of the main pipe 111 with the cutter 41 hits the stopper 107 protruding into the cavity 106 of the joint 100 during the cutting, and is prevented from moving in the cutter cutting direction. Therefore, escape of the cut portion of the main pipe 111 can be prevented, the cutting position of the cutter 41 becomes a desired position, and the side wall of the main pipe can be cut off. The section C is accommodated in a space between the cutter body 43 and the back plate 45 after being completely separated from the main tube 111.

(4) During Cutter Lifting Movement As shown in FIG. 12, the feed screw shaft 29 is turned and the cutter 41 is pulled up contrary to the above-described cutter cutting. Here, after the side wall of the main pipe 111 is cut by the cutter 41, the holding plate 55 rises from the inner surface of the 45 back plate and protrudes. When the section C accommodated between the cutter body 43 and the back plate 45 is lowered by its own weight or the like, the section C is not dropped from the cutter 41 in order to support it from the lower side. The section C can be collected into the casing 13 of the tool 11 as the casing 13 is pulled up.

(5) End of cutter lifting After grasping the handle 25 by hand and lifting the shaft sleeve 23, the feed screw shaft 29 and the cutter 41 until the slide stopper hits the lower end surface of the bush 21, the lock bar 31 is moved as shown in FIG. Screw in. Then, the long hole 45a (see FIG. 4) of the back plate 45 is viewed from the window 17, and it is confirmed that the section C is held inside the cutter 41. Thereafter, the connecting shaft 68 (see FIG. 7) of the shutter 61 is rotated with a spanner or the like, and the shutter plate 67 is closed with the point of the indication bar 69 aligned with the indication point 63C. Then, after confirming that the shutter plate 67 is completely closed, the tool body 11 is removed.

After the operations described in (1) to (5) above are completed, the closing plug tightening operation (6) described below using the closing plug tightening tool 81 described with reference to FIG. 8 (FIG. 14). ) To (8) (FIG. 16).
(6) Start of Closure Plug Installation Operation First, as shown in FIG. 14, the closure plug collar 93 and the recess 130 a on the upper end surface of the closure plug 130 are fitted in the main body 83 of the closure plug fastening tool 81. At this time, it is confirmed that the pin 91a of the stopper 91 is inserted into the pin hole 87b of the shaft 87 and the shaft 87 is not lowered. In this state, the stopper plug tightening tool 81 is placed on the upper side of the shutter 61 as shown in FIG. 14, and the upper flange 65A of the shutter 61 and the flange 85 of the main body 83 are connected by bolts and nuts (not shown). When the coupling is completed, the shutter plate 67 of the shutter 61 is opened.

(7) Closure stopper screwing operation As shown in FIG. 15, when the shutter plate 67 is completely opened and the pin 91a of the stopper 91 is removed from the pin hole 87b of the shaft 87, the shaft 87 can be lowered. At this time, since the plungers 94 (see FIG. 8) on the two sides of the stopper plug collar 93 are fitted in the grooves on the side surface of the recess 130a on the upper end surface of the stopper plug 130, the stopper plug 130 does not fall. Then, the slide stopper 130 is slid down until the lower end of the stopper plug 130 hits the upper end of the cutter moving part 105 of the branch extraction joint 100. Thereafter, the handle 89 is grasped and turned, and the closing plug 130 is screwed into the internal thread 105 a of the inner hole of the joint cutter moving unit 105. When the screwing of the closing plug 130 is completed, the upper end opening of the cutter moving unit 105 is sealed.

(8) Closing of the stopper plug installation operation When the screwing of the stopper plug 130 is completed, the handle 89 is grasped and the shaft 87 is pulled up (state shown in FIG. 16), and the pin 91a of the stopper 91 is again inserted into the pin hole 87b of the shaft 87. Since the plunger 94 of the stopper plug collar 93 engaged with the stopper plug recess 130a is disengaged by the force when the shaft 87 is pulled up, only the shaft 87 is easily pulled up. Then, the stopper plug tightening tool 81 and the shutter 61 are removed in this order to complete the operation.

Next, the case where this drilling tool 1 is used for drilling a relatively small diameter main pipe (100A, 150A, etc.) will be described.
FIG. 18 is a cross-sectional view showing a pipe structure in the vicinity of a branch outlet joint for a small diameter according to the present embodiment and the entire configuration (tool body and shutter) of a branch joint drilling tool attached to the branch outlet joint. is there.
FIG. 18 illustrates a branch extraction joint 100 ′ that is applied to a main pipe (100A, 150A, etc.) having a relatively small diameter. In this case, the connection adapter 150 that connects the connection flange 108 ′ of the branch extraction joint 100 ′ and the lower flange 65 B of the shutter 61 is used. The connection adapter 150 is a cylindrical body including a lower flange portion 151 that matches the outer shape of the connection flange 108 ′ and an upper flange portion 152 that matches the lower flange 65B of the shutter 61. By using such a connection adapter 150, the tool 1 can be used for a small-diameter joint as well as a large-diameter joint. In addition, the cutter main body of the cutter used in this case shall be equipped with a cutter blade as shown in FIG.

It is a figure which shows the structure of the branch extraction coupling which concerns on one embodiment of this invention. (A) is a plan view, (B) is a side sectional view, and (C) is a left front view. It is sectional drawing which shows the piping structure of the branch extraction joint vicinity which concerns on this Embodiment, and the whole structure (tool main body and shutter) of the drilling tool for branch joints attached to the branch extraction joint. It is a figure which shows the structure of the tool main body of the drilling tool for branch joints. (A) is the whole perspective view, (B) is the perspective view which looked at (A) from the lower side. It is a figure which shows the cutter attached to the tool main body of the drilling tool for branch joints. (A) is a whole perspective view, (B) is a partial bottom view of (A) showing the connection state with the back plate of the cutter body as viewed from below. It is the expanded view and sectional drawing which show the cutter main body (for large diameter) of the cutter of FIG. (A) is an inner development plan view, (B) is a development front view, (C) is an outer development plan view, and (D) to (H) are DD lines in (B), respectively. It is a HH line sectional view. It is the expanded view and sectional drawing which show the other cutter main body (for small diameter). (A) is an inner developed plan view, (B) is a developed front view, (C) is an outer developed plan view, and (D) is a sectional view taken along line DD of (B). It is a perspective view which shows the structure of the shutter of the drilling tool for branch joints. It is a figure which shows the structure of the closing plug fastening tool of the branch extraction coupling which concerns on this Embodiment. (A) is the whole perspective view, (B) is the perspective view which looked at (A) from the lower side. It is sectional drawing which shows the state at the time of the work disclosure of the drilling work in a branch pipe taking-out work. It is sectional drawing which shows the state during cutter push-down movement of the same drilling operation (just before cutting). It is sectional drawing which shows the state at the time of completion | finish of cutter cutting of the same drilling operation | work. It is sectional drawing which shows the state during the cutter (and section) pulling-up movement of the drilling operation. It is sectional drawing which shows the state at the time of completion | finish of the cutter raising of the same drilling operation | work. It is sectional drawing which shows the state at the time of the operation | work disclosure of the closure plug installation operation | work in a branch pipe extraction operation | work. It is sectional drawing which shows the state at the time of the closure plug screwing of the closure plug installation operation | work. It is sectional drawing which shows the state at the time of completion | finish of the operation | work of the closure stopper mounting | wearing operation | work. It is a top view which shows the state of the cutter arrange | positioned in the cutter moving part of a branch extraction coupling. It is sectional drawing which shows the piping structure near the branch extraction joint for small diameters concerning this Embodiment, and the whole structure (tool main body and shutter) of the drill tool for branch joints attached to the branch extraction joint. It is sectional drawing which shows the state in the drilling operation | work of the branch extraction joint in patent document 1. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Drilling tool 11 Tool main body 13 Casing 17 Window 21 Bush 23 Shaft sleeve 24 Handle block 25 Handle 27 Slide stopper 28 Stabilizing collar 29 Feed screw shaft 33 Cutter guide 34 Stabilizing member 41 Cutter 43, 43 'Cutter main body 42, 42' Cutter blade 45 Back plate 47 Cutter guide 47a Leg 47b Guide bar 47c Reinforcement bar 51 Female thread block 51a Female thread 53 Slide part 55 Holding plate (hinge with spring)
61 Shutter 63 Body 67 Shutter plate 81 Closing stopper tightening tool 100 Branch extraction joint 101 Saddle part 102 Opening 103 Branch pipe connection part 105 Cutter moving part 106 Cavity 106X Counter pipe inner wall 107 Stopper 111 Main pipe 111X Branch hole 112 Branch pipe 130 Closure plug 150 Connection adapter C Section

Claims (7)

A saddle portion having an opening in the central portion, which is applied to and fused to the outer surface of the side wall of the resin main pipe;
A hollow branch pipe connecting portion protruding outward from the saddle portion;
A cutter moving part that protrudes in a direction different from the branch pipe connecting part from the saddle part, having a cavity in which a cutter that cuts off the main pipe side wall located at the opening of the saddle part and opens a branch hole in the side wall;
A drilling tool that is attached to a branch outlet joint and opens the main pipe branch hole,
The cutter,
A moving mechanism of the cutter;
One side (joint side) is connected to the cutter moving part of the branch extraction joint, and a shutter that opens and closes the cavity of the cutter moving part,
A main body casing that is connected to the other side (casing side) of the shutter and that houses the moving mechanism and supports the cutter movably through the moving mechanism;
A cutter guide that transmits the cutting reaction force of the cutter to the inner wall of the cutter moving portion on the side opposite to the pipe, and prevents escape when the cutter is cut;
Equipped with,
The cutter is
A plate body that is curved in a semi-cylindrical shape, and a cutter body in which a cutter blade is formed at one end edge;
A back plate disposed on the back portion of the cutter body (inner curved side of the plate body) to which both side ends of the cutter body are connected;
Have
The cutter guide has a leg portion that rises from the surface near both sides of the back surface of the back plate, and a guide bar that extends in the moving direction of the cutter attached to the leg portion,
A drilling tool for a branch take-out joint, wherein the guide bar hits the inner wall of the cavity opposite to the counter pipe and the inner wall receives the cutting reaction force of the cutter .   2. The branch extraction joint drilling tool according to claim 1, wherein a clearance is provided at a connection portion between both end portions of the cutter body and the back plate. The cutter blade of the cutter body is
Near the center in the semicircular direction, it is formed in a triangular cross section that is inclined from the curved outer surface toward the curved inner surface,
Near both ends in the semicircular direction, it is formed in a triangular cross section that is inclined from the curved inner surface toward the curved outer surface,
3. The branch extraction joint drilling tool according to claim 2, wherein between the vicinity of the central portion and the vicinity of both end portions, a cross-sectional mountain shape is formed that is inclined from both the curved inner and outer surfaces toward the thickness center. .   The branch extraction joint drilling tool according to claim 1, wherein both end portions of the cutter body and the back plate are fixed by welding or the like. The cutter blade of the cutter body is
The branch extraction joint drilling tool according to claim 4, wherein the drilling tool is formed in a mountain-shaped cross section inclined from both the curved inner and outer surfaces toward the end of the cutter body over the semicircular direction. A swingable holding plate (hinge) is attached to the inner surface of the back plate (the surface facing the cutter body),
While cutting the main pipe side wall with the cutter, the holding plate hits the side wall outer surface of the main pipe and falls to the inner surface side of the back plate,
After the side wall of the main tube is cut by the cutter, the holding plate rises on the inner surface of the back plate and holds the cut piece in the space between the cutter body and the back plate. The drilling tool for a branch extraction joint according to any one of claims 1 to 5. A drilling tool for a branch outlet joint according to any one of claims 1 to 6, wherein a window through which the amount of movement of the cutter can be visually observed is formed in the main body casing.

Images