JP2024020169A - Branch pipe forming device and method of attaching chip collector - Google Patents

Abstract

To provide e a branch pipe forming device which can enhance the position accuracy of drilling with a cutter even if a cutter axle is shifted to an existing pipe side, and a method of attaching a chip collector.SOLUTION: A branch pipe forming device 100 comprises a drilling machine E for operating a cutter 30 in a drilling direction in a driven-rotated state, and performing drilling operation for forming a drilled hole in an existing pipe W with the cutter 30. The drilling machine E comprises: a cylindrical cutter 30; a drive shaft 31 for driving the cutter 30 to rotate; a guide cylinder 32 formed in a cylindrical shape centered at a cutter axis Z and accommodating the cutter 30; and a guide plate 37 which rotates integrally with the cutter 30. The guide plate 37 is provided at a position in which the guide plate 37 abuts on an internal peripheral surface of the guide cylinder 32 when a blade part 30a of the cutter 30 initially bites in the existing pipe W in drilling operation by the cutter 30.SELECTED DRAWING: Figure 1

Description

The present invention relates to a branch tube forming device and a method for attaching a section collector.

For example, technology for a branch pipe forming device that can form a perforation in an existing pipe while attached to the outer surface of an existing pipe in a non-flow state, and send fluid from the perforation to a branch pipe. is shown in Patent Document 1 and Patent Document 2.

Patent Document 1 describes a cylinder that is attached to a connection case having a branch part (connection port in the document) on the outer periphery of an existing pipe (fluid transport pipe in the document) and housed in a work case provided in the connection case. A technique for forming perforations in existing pipes using a rotary cutter is shown. In this Patent Document 1, a branch pipe forming device is configured by combining a connection case and a work case.

In the branch pipe forming device of Patent Document 1, the rotation axis of the cutter is set outside the outer surface of the existing pipe, and the cutter is moved in a direction along the rotation axis while being driven and rotated to cut out a part of the existing pipe. The drilling is done as follows. In addition, the cutter is equipped with a center drill coaxial with the rotation axis, and the inside of the connection case has a cylindrical member into which the center drill can be inserted coaxially with the rotation axis before drilling is performed. It is located.

This cylindrical member is formed with a recess into which the outer surface of the existing pipe enters, and when the cutter moves for drilling, the center drill is inserted into the cylindrical member, and the center drill and the cylindrical member are connected by the engagement means. engage the member. After the cutter finishes drilling, the cutter is returned to accommodate the cut portion cut from the existing pipe inside the cylindrical cutter, and can be taken out together with the cutter.

The branch pipe forming device of Patent Document 2 has a cutter structure similar to that of Patent Document 1, and is configured to be able to take out the cut portion cut out from the existing pipe by the cutter, but the structure for taking out is the same as that of Patent Document 1. The parts are different.

The branch pipe forming device of Patent Document 2 includes a center drill that is coaxial with the rotation axis of a cylindrical cutter, and is guided inside a case (first divided member and second divided member) by the rotation axis and the coaxial core. A tube and a flat plate member at its lower end are placed before the cutter makes the hole.

The guide tube is disposed close to the outer surface of the existing pipe, and the flat plate member is disposed at the end position of the drilling operation of the cutter, with a portion thereof being disposed close to the existing pipe. A shaft holding bolt that abuts the existing pipe from below is screwed into the guide cylinder. With this configuration, when the cutter moves for drilling, the center drill is inserted into the guide tube, the center drill and the guide tube reach an engaged state, and the tip of the cutter reaches the flat plate member. Then, by returning the cutter after completing the drilling with the cutter, the cut portion held up to the shaft core holding bolt is taken out together with the cutter while being housed inside the cylindrical cutter.

Japanese Unexamined Patent Publication No. 60-201808 JP 2021-173383 Publication

In the branch pipe forming devices of Patent Documents 1 and 2, the cutter is supported at the end of a long drive shaft (rotating shaft in Document 2), so for example, when drilling, the cutter blade may touch the outer surface of the existing pipe. If contact occurs, a force will be applied to the cutter in the direction of sliding along the outer surface of the existing cylindrical pipe, causing the drive shaft to bend slightly and potentially causing the cutter to deviate from its proper axis. There was also concern that this would reduce the accuracy of the drilling position.

In addition, in the branch pipe forming apparatuses of Patent Documents 1 and 2, the cutter axis is located outside the outer surface of the existing pipe, so when forming a perforation with an opening area that obtains the required flow rate, A cutter with a large radius must be used, and as a result, there is a concern that the cutter will become larger and the branch pipe forming device will become larger.

For these reasons, there is a need for a branch pipe forming device and a method for attaching a section collector that can improve the positional accuracy of drilling by the cutter even when the cutter axis is moved toward the existing pipe.

A characteristic configuration of the branch pipe forming device according to the present invention includes: a case portion that is attached to the outer surface of the existing pipe in a non-flow state; and a punching machine that forms a hole in a part of the existing pipe; is a branch pipe forming device having a branch part that can communicate with the punching port, the punching machine having a cylindrical cutter, driving and rotating the cutter around the cutter axis, and rotating the cutter around the cutter shaft. a drive shaft that reciprocates the cutter in a direction along the core; a cylindrical guide tube centered on the cutter axis that can accommodate the cutter; and a guide plate whose outer end protrudes outward from the outer periphery of the cutter, and the drilling machine includes a guide plate whose outer end protrudes outward from the outer periphery of the cutter; The guide plate is provided at a position where the guide plate abuts against the inner circumferential surface of the guide cylinder when it first bites in.

According to this characteristic configuration, when the blade portion of the cutter first bites into the existing pipe during the drilling operation, a force is applied to the cutter in the direction of sliding along the outer surface of the cylindrical existing pipe. As a result, although the cutter tries to displace in a direction away from the original cutter axis, the guide plate comes into contact with the inner surface of the cylindrical guide tube, which restricts the displacement and prevents the inconvenience of the cutter coming off from its proper position. I'm never invited. Therefore, there is no need to separately provide a member to guide the cutter axis when the cutter blade first bites into the existing pipe, and it is possible to move the cutter axis closer to the existing pipe. Accordingly, a branch pipe forming device has been constructed that increases the positional accuracy of drilling by the cutter even when the cutter axis is moved toward the existing pipe side.

In addition to the above configuration, when viewed in a direction along the cutter axis, the cutter axis may be arranged at a position that is offset from the pipe axis of the existing pipe and overlaps with the existing pipe. .

According to this, when viewed in the direction along the cutter axis, the cutter axis is located at a position that is off the axis of the existing pipe and overlaps with the existing pipe, so when viewed in the direction along the cutter axis, It is possible to make the radius of the cutter smaller than when the cutter axis is placed outside the outer surface of the existing pipe. Therefore, with the branch pipe forming device having this configuration, it is possible to form a perforation opening with a required opening area in an existing pipe while suppressing the large diameter of the cutter.

In addition to the above configuration, the case part accommodates the cut portion separated from the existing pipe by the drilling operation in the internal space of the cutter, and accommodates the cut portion in the cutter together with the return operation of the cutter. It is also possible to have a take-out mechanism for taking out the product in the state.

According to this, when the cutter reaches the end of the drilling operation, the drilling port is formed in the existing pipe, and the cut portion separated from the existing pipe is accommodated in the interior space of the cutter. Next, when the cutter performs a return operation, the cut portion accommodated in the internal space of the cutter can be taken out together with the cutter.

In addition to the above configuration, the take-out mechanism is arranged within the case portion at a first support body disposed at an upstream position in the direction of the drilling operation, and at a downstream position in the direction of the drilling operation. At least two supports with the second support and a position holder that maintains the vertical positional relationship between these supports are disposed inside the cutter, and the first support is aligned with the cutter axis. A through hole is formed coaxially with the cutter, and the cutter moves a center spindle that enters the through hole into the interior of the cutter coaxially with the cutter axis before the cutter reaches the end position of the drilling operation. In preparation for the space, the take-out mechanism may include an engagement mechanism that prevents the center spindle from coming off from the through hole when performing the return operation after the drilling operation.

According to this, by performing a drilling operation with a cutter, the cut portion separated from the existing pipe is accommodated in the internal space of the cutter together with at least two supports, and when the cutter reaches the end of the drilling operation, the first support The center spindle will fit into the through hole. Thereafter, when the cutter performs a return operation, the engagement mechanism prevents the center spindle from coming out of the through hole, so that the cut portion can be taken out while being accommodated in the internal space of the cutter.

In addition to the above configuration, the engagement mechanism has a retracted position in which it is stored inward from the outer circumferential surface of the center support shaft, and a locked position in which it protrudes radially outward from the outer circumferential surface of the center support shaft. A locking body is provided on the center spindle, and the locking body is slid in a direction along the cutter axis to restrain the locking body in the retracted position; A sleeve is provided on the outer periphery of the center spindle and can be switched freely between a release position and a release position allowing transition to a locking position, and the engagement mechanism starts the drilling operation with the sleeve set in the locking position. In a state in which the center spindle is inserted into the through hole, a part of the first support body contacts the sleeve and moves to the release position before the cutter reaches the end position of the drilling operation. By moving the locking body to the locking position, the locking body engages with the first support during the return operation of the cutter, and thereby the center spindle and The return operation may be performed integrally with at least two of the supports.

According to this, the center spindle enters the through hole before the cutter reaches the final position of the drilling operation, and the sleeve moves to the release position when the cutter reaches the final position of the drilling operation, so the locking body is It becomes possible to switch to the locked position. In other words, in this configuration, after the sleeve moves to the release position, for example, the locking body can be switched to the locking posture by the centrifugal force accompanying the rotation of the center spindle, or the locking body can be moved to the locking position by the action of the locking body's own weight. When the cutter returns to its locked position, the first and second supports move together with the cutter, making it possible to reliably take out the cut section separated from the existing pipe. .

In addition to the above configuration, at least one of the first support and the second support of the extraction mechanism has a contact surface that can make surface contact with the outer surface of the existing pipe, or It may have a plurality of contact points that make contact at a location.

According to this, at least one of the first support and the second support comes into contact with the outer surface of the existing pipe through the contact surface, or contacts through a plurality of contact points, so that the The posture of the support or the second support is stabilized. As a result, the first support or the second support does not come into contact with the inner surface of the cutter, and the cut portion separated from the existing pipe can be reliably taken out.

In addition to the above configuration, the case portion has a circular opening that allows the cutter of the drilling machine to be inserted and removed, and has a structure that allows the opening to be closed with a closure after the drilling machine is removed. wherein the opening has a plurality of first claws on the inner periphery, and the closure body engages with the plurality of first claws by rotation about the center of the opening, and a second claw reaches a state where it is not removed. You can also prepare your body.

According to this, after removing the drilling machine from the case part, a closure body is placed at a position to be fitted into the opening, and by rotating this closure body, the second claw bodies corresponding to the plurality of first claw bodies are engaged. The closure body can be set to prevent it from coming off.

A feature of the method for attaching a section collector according to the present invention is that the case part is attached to the outer surface of an existing pipe in a non-flow state, and the case part has a branch part that can communicate with a perforation hole formed by a perforation machine. A method for attaching a section collector to a branch pipe forming apparatus having a section collector, the method includes a step of arranging the section collector inside the case part, and a cutter axis of the drilling machine is The method includes a centering step of fixing the relative position of the section collector with respect to the existing pipe using a centering jig so that the section collector is coaxial with the through hole formed in the section collector.

According to this feature, in the placement process, the section collector is placed inside the case part, and in the centering process, the centering jig makes the cutter axis of the punching machine coaxial with the through hole formed in the section collector. Fix the relative position with respect to the section collector. In this mounting method of the section collector, the section collector is arranged coaxially with the cutter axis, so for example, when drilling a hole with a cylindrical cutter that is lowered, the section collector is housed inside the cutter. Even with this configuration, the positional relationship between the cutter and the section collector can be maintained at an optimal position, and the sections (cut portions of existing pipes) can be reliably recovered. Furthermore, since the cutter axis of the punching machine is coaxial with the through hole formed in the section collector, misalignment of the cutter can be prevented during the punching operation.

Alternatively, the section collector comprises a first support disposed at an upstream position in the direction of the drilling operation of the drilling machine and a second support disposed at a downstream position in the direction of the drilling operation. It has at least two supports and a position holding body that maintains the vertical positional relationship between them, and the arrangement step includes placing the second support on the second support placed on the bottom of the case part. After the first support and the position holder are connected, the first support and the second support may be moved closer to each other by operating the position holder and brought into contact with the existing pipe.

According to this, in the arrangement step, the first support body, the second support body, and the position holding body connected to these are placed inside the case part, and the first support body and the second support body are connected by operating the position holding body. It becomes possible to move the pipe close to the existing pipe and bring it into contact with the existing pipe. As a result, the section collector can be easily attached, and the position of the section (cut portion of the existing pipe) can be stabilized by the drilling operation of the punching machine, and the section can be stored inside the section collector.

FIG. 3 is a longitudinal cross-sectional view showing the branch pipe forming device with the cutter in an initial position. It is a sectional view showing the positional relationship of a case part, a cylindrical projection part, and a valve case. FIG. 3 is a longitudinal cross-sectional view showing the branch pipe forming device when the cutter performs a drilling operation. FIG. 3 is a longitudinal cross-sectional view of the branch pipe forming device in which the cutter is at the drilling end position. FIG. 3 is a cross-sectional view showing the shape of a perforation formed in a water pipe. FIG. 3 is a longitudinal cross-sectional view showing the branch pipe forming device in which the cutter has returned to the take-out position. FIG. 2 is a side view showing a first support, a second support, a position holding body, and the like. It is a front view showing a first support body, a second support body, a position holding body, etc. FIG. 7 is a cross-sectional view showing the locking body before the center spindle enters the through hole. FIG. 7 is a sectional view showing the locking body after the center support shaft has entered the through hole. It is a longitudinal cross-sectional view of a state provided with a closure unit. It is a longitudinal cross-sectional view of a state in which the stopper plate is fitted into the cylindrical protrusion. It is a perspective view showing a movable side claw body and a fixed side claw body. FIG. 7 is a plan view of the closure disc fitted into the cylindrical protrusion. FIG. 7 is a plan view showing the closure disc in a state where it is prevented from coming off by rotation. FIG. 3 is a longitudinal cross-sectional view showing a state in which the closure disc is prevented from coming off. It is a longitudinal cross-sectional view which shows the sweep mechanism of another embodiment (a). It is a sectional view showing a sweep tube, a ball joint, etc. of another embodiment (a). It is a longitudinal cross-sectional view which shows the sweep operation|work of another embodiment (a). FIG. 7 is a sectional view showing a plug member screwed into an insertion hole of a plugging disc of another embodiment (a). FIG. 7 is a cross-sectional view showing a fixing member screwed into the insertion hole of the closure disc of another embodiment (a). It is a sectional view of the state where the bottom plate and the second support body of another embodiment (b) are arranged. FIG. 7 is a sectional view showing a state in which the main position holding body of another embodiment (b) is attached. It is a side view which shows the first support body, the second support body, a position holding body, etc. of another embodiment (b). It is a front view which shows the first support body, the second support body, a position holding body, etc. of another embodiment (b). It is a figure which shows the structure of the centering jig of another embodiment (b). It is a figure which shows the operation form of the main position holding body of another embodiment (b). It is a longitudinal cross-sectional view which shows the branch pipe forming apparatus in which the cutter of another embodiment (b) is in an initial position. It is a longitudinal cross-sectional view which shows the branch pipe forming apparatus when the cutter of another embodiment (b) performs a drilling operation. It is a longitudinal cross-sectional view which shows the branch pipe forming apparatus in which the cutter of another embodiment (b) is in the perforation end position. It is a longitudinal cross-sectional view which shows the branch pipe forming apparatus of another embodiment (b) in which the cutter has returned to the take-out position.

Embodiments of the present invention will be described below based on the drawings.
[Basic configuration]
As shown in FIGS. 1 to 6, it is equipped with a case part C configured as a T-shaped pipe that is attached to the outer surface of a water pipe W as an existing pipe and sends out water from an inlet pipe 3 (an example of a branch part), A valve unit D is provided at the upper end of the cylindrical protrusion 4 of the case portion C, and a perforator E is provided on the upper surface of the valve unit D, thereby configuring the branch pipe forming apparatus 100.

The branch pipe forming device 100 opens a perforation port Wa (see FIGS. 5 and 6) so as to cut out a part of the water pipe W using a perforator E when water is flowing through the water pipe W (existing pipe) in an uninterrupted state. This makes it possible to carry out construction in which the water flowing in the water pipe W is sent to the inlet pipe 3. After this construction, the punching machine E is removed from the case part C, and as shown in FIG. The work (details of the closing work will be described later) is performed.

The drilling machine E forms a hole Wa in the water pipe W as shown in FIGS. 5 and 6 by the drilling operation of the cylindrical cutter 30 shown in FIGS. 1, 3, and 4, and after this drilling operation. As the cutter 30 returns, as shown in FIG. 6, the take-out mechanism 40 (an example of a section collector) takes out the cut portion Wb of the water pipe W while storing it in the internal space 30S of the cutter 30. The extraction mechanism 40 is provided in the punching machine E and uses a part of the cutter 30, and the extraction mechanism 40 extracts the cut portion Wb (section) of the water pipe W to the outside of the case portion C. Incidentally, the cutter 30 has a large number of through holes formed in its cylindrical portion.

The cutter 30 functions as a hole saw, and is composed of a cylindrical cutter body 30b having a blade portion 30a with a carbide tip at the lower end. Details of the configuration and operation mode of this drilling machine E will be described later.

1, 3, and 4 show a vertical cross section of the branch pipe forming device 100 installed on a water pipe W. As shown in these figures, the center of the water pipe W is called a pipe axis X, and the center of the insertion pipe 3 is called a branch axis Y. Further, the rotation center of the cutter 30 that forms the perforation Wa shown in FIGS. 5 and 6 for the water pipe W is referred to as a cutter axis Z. The branch axis Y is orthogonal to the tube axis X, and the cutter axis Z is orthogonal to the tube axis X and the branch axis Y, respectively, so that their relative postures are set.

This branch pipe forming device 100 can be used in any position, but as shown in FIG. 1, the water pipe W is in a horizontal position and the cutter axis Z is in a vertical position along the vertical direction. Explain the hierarchical relationship.

[Case part]
As shown in FIGS. 1 to 6, the case portion C includes a first divided member 1 disposed above the water pipe W, and a second divided member 2 disposed below the water pipe W. It has an insertion tube 3 that is held between the first divided member 1 and the second divided member 2. These first divided member 1, second divided member 2, and inlet tube 3 are cast products such as ductile cast iron.

The insertion tube 3 has a cylindrical main body 3a, and a branch flange 3b is integrally formed at an intermediate portion along the branch axis Y of the cylindrical main body 3a so as to protrude outward. In this embodiment, the flanged insertion tube 3 is shown, but the insertion tube 3 may have a configuration in which the flange portion is fixed to the outer periphery of the tube using a press ring.

The first divided member 1 and the second divided member 2 have a split surface along a plane that includes the pipe axis X of the water pipe W and the branch axis Y of the insertion tube 3, and these are in a sealed state with each other. are connected. Here, the split surface along the plane that includes the pipe axis X of the water pipe W and the branch axis Y of the inlet pipe 3 is the pipe axis X of the water pipe W and the branch axis of the inlet pipe 3. It means a cut surface that is on a plane that includes the core Y or on a plane that is substantially parallel to the plane. The water pipe W, the first dividing member 1 and the second dividing member 2, and the inlet pipe 3 in this embodiment are made of the same type of material such as cast iron. Note that different materials may be used for the water pipe W, the first dividing member 1 and the second dividing member 2, and the insertion tube 3.

As shown in FIG. 5, the first dividing member 1 is a semicircular area that covers the upper part of the outer circumference of the water pipe W, and covers the upper part of the water pipe W at both outer end positions in the direction along the pipe axis X. A semicircular first end opening 1a is formed. The first divided member 1 forms a first branch opening 1b at the outer end position of a semicircular area that covers the upper part of the insertion tube 3. As shown in FIG. 1, a cylindrical protrusion 4 is formed on the upper surface of the first divided member 1 coaxially with the cutter axis Z.

Similarly, the second dividing member 2 is a semicircular area that covers the lower part of the outer periphery of the water pipe W, and is located at both outer end positions in the direction along the pipe axis X. A second end opening 2a is formed. The second divided member 2 forms a second branch opening 2b at the outer end position of a semicircular area that covers the lower part of the insertion tube 3.

The first divided member 1 and the second divided member 2 have their respective divided surfaces aligned, and the first divided member 1 is arranged along the divided surfaces so that they can be integrated while covering the entire circumference of the water pipe W. A first flange portion 1f is formed, and a second flange portion 2f is formed along the split surface of the second divided member 2.

With such a configuration, the case part C arranges the first dividing member 1 and the second dividing member 2 at positions sandwiching the water pipe W, and connects the first branch opening 1b and the second branch opening 2b. The cylindrical main body 3a of the insertion tube 3 is placed in a sandwiched position, and the respective split surfaces are aligned, and as shown in FIG. It is attached to the water pipe W by fastening with a plurality of fastening nuts (not shown).

When the case portion C is attached to the water pipe W in this manner, the water stop seal S is placed on the opposing surfaces of the first flange portion 1f and the second flange portion 2f. In addition, as shown in FIG. 5, the water stop seal S includes the inner periphery of the first end opening 1a of the first divided member 1, the inner periphery of the second end opening 2a of the second divided member 2, It is arranged at a position where it is sandwiched between these and the entire outer surface of the water pipe W that faces them.

In addition, when mounting the branch pipe forming device 100 on the water pipe W, construction may be performed in advance to connect the branch flow path pipe 5 to the inlet pipe 3 so as to connect to the branch flange 3b. The branch flow path pipe 5 can also be provided with an on-off valve on the downstream side of the flow path.

As shown in FIGS. 1 and 2, this branch pipe forming device 100 has a valve unit D fixed to the upper surface of a protruding side flange portion 4a formed on a cylindrical protruding portion 4, and a perforated hole is formed on the upper surface of this valve unit D. Machine E is fixed.

[Valve unit]
As shown in FIGS. 1 and 2, the valve unit D includes a valve case 21 supported by the cylindrical protrusion 4, and is slidably movable inside the valve case 21 in a posture perpendicular to the cutter axis Z. The valve body 22 includes a plate-shaped valve body 22 and a handle (not shown) for sliding the valve body 22 by manual operation. The valve body 22 can be switched between an open position shown in FIGS. 1 to 4 and 6 and a closed position shown in FIG. 11.

As shown in FIG. 2, the valve case 21 has a lower opening centered on the cutter axis Z formed in the lower wall of the valve case 21, and a lower cylindrical portion 21a that protrudes downward from the outer periphery of the lower opening. It is formed. The lower cylindrical portion 21a has an inner diameter that surrounds the outer periphery of the protruding flange portion 4a. A position regulating part 21b is formed on the inner periphery of the lower cylindrical part 21a and is in contact with the upper surface of the protruding flange part 4a. A plurality of screw holes are formed.

As shown in FIG. 2, the valve case 21 is arranged so that the position regulating portion 21b is brought into contact with the upper surface of the outer periphery of the protruding flange portion 4a. In this arrangement state, the engagement bolt 24 is screwed into the plurality of screw holes of the lower cylindrical portion 21a, and the tapered surface 24T on the outer periphery of the tip of the engagement bolt 24 is brought into contact with the lower surface of the outer periphery of the protruding side flange portion 4a. Then, the valve case 21 is fixed to the upper end of the cylindrical protrusion 4.

When the valve case 21 is fixed in this way, a force that moves the valve case 21 downward acts on the valve case 21, so that the lower cylindrical portion 21a is positioned on the upper surface of the protruding flange portion 4a. The lower surface of the regulating portion 21b is in close contact with the regulating portion 21b, and a sealing material (not shown) provided at the corner portion realizes fixation in a watertight state.

As shown in FIGS. 1 and 2, the valve case 21 has an upper cylindrical portion 21c formed on its upper wall and protruding upward from the outer periphery of the upper opening centered on the cutter axis Z. The upper cylindrical portion 21c has a case-side flange portion 25 formed at its upper end, and the punching machine E is connected and fixed to this case-side flange portion 25.

[Drilling machine]
As shown in FIG. 1, FIG. 3, FIG. 4, and FIGS. 6 to 8, the punching machine E includes a cylindrical cutter 30 centered on the cutter axis Z, and a cylindrical cutter 30 centered on the cutter axis Z. It includes a drive shaft 31 that can drive and rotate and reciprocate in the direction along the cutter axis Z, and a cylindrical guide tube 32 centered on the cutter axis Z that accommodates the cutter 30. Note that the drive shaft 31 is driven and rotated by the driving force from the drive unit 33.

The drive unit 33 includes an electric motor (not shown) that rotationally drives the drive shaft 31 and a shift motor (not shown) that reciprocates the drive shaft 31 along the cutter axis Z. 1, FIG. 3, FIG. 4, etc. only show the case at the lower end of the drive unit 33.

The drive unit 33 is assumed to be equipped with a sensor that detects the position of the cutter 30 during drilling operation, and to automatically control an electric motor and a shift motor. It is also possible to provide a shift motor and a switch for artificially controlling drive and stop so that the drilling operation can be performed without automatic control.

The drilling machine E is operated from the initial position shown in FIG. 1 with the cutter 30 driven and rotated in the drilling direction (downward in the figure) as shown in FIG. A drilling operation is performed to form the perforation opening Wa, and after the cutter 30 reaches the drilling end position (end position of the drilling operation) shown in FIG. 4, the cutter 30 is caused to perform a return operation in the opposite direction to the drilling operation.

This punching machine E is equipped with a take-out mechanism 40 that takes out the cut portion Wb separated from the water pipe W during the return operation while being accommodated in the internal space 30S of the cutter 30. In this take-out mechanism 40, after the cutter 30 reaches the take-out position which is the end of the return operation shown in FIG. 6, the punch E is removed together with the cut portion Wb.

The guide tube 32 includes a lower end flange 34 at its lower end, and an upper end flange 35 at its upper end. The guide cylinder 32 has a lower end flange 34 connected to the case side flange portion 25 of the valve case 21 with a plurality of bolts, and an upper end flange 35 connected to the case portion of the drive unit 33 with a plurality of bolts.

As shown in FIGS. 1, 2, 9, etc., the cutter 30 includes a drive plate 36 and a guide plate 37 in an overlapping state at the upper end (the end opposite to the blade portion 30a). The drive plate 36 has a disc shape that is partially fitted into the upper end of the cutter body 30b, and is connected to the cutter body 30b. The guide plate 37 has a disk shape with a larger diameter than the outer shape of the cutter body 30b, and the outer diameter of the guide plate 37 is set so that the outer periphery of the guide plate 37 is close to the inner surface of the guide tube 32 so that it can come into contact with the inner surface of the guide tube 32. There is.

As shown in FIGS. 9 and 10, the flange-shaped lower end of the drive shaft 31, the guide plate 37, and the drive plate 36 are integrated by a plurality of connecting bolts 31a that pass through them. Thereby, the drive plate 36, guide plate 37, and cutter 30 rotate integrally by the rotational driving force of the drive shaft 31.

In particular, in this branch pipe forming device 100, as shown in FIGS. 1, 3, and 4, the inner diameter of the guide tube 32 is D1, the outer diameter of the guide plate 37 is D2, and the opening 4S of the cylindrical protrusion 4 When the inner diameter of is D3, the dimensional relationship is set so that D1 and D2 are approximately equal (D1≈D2) and the value of D3 is larger than these (D3>D1≈D2).

From this dimensional relationship, during the drilling operation in which the cutter 30 is moved along the cutter axis Z while being driven and rotated, as shown in FIG. 3, when the blade portion 30a of the cutter 30 first bites into the water pipe W, The outer peripheral edge of the guide plate 37 is in contact with the inner peripheral surface of the guide tube 32 to prevent the cutter 30 from sliding outwardly along the surface of the water pipe W, and the cutter 30 is aligned with the cutter axis Z. To suppress the inconvenience of rotating at a position out of position.

Further, as the outer peripheral edge of the guide plate 37 comes into contact with the inner surface of the guide tube 32, the blade portion 30a of the cutter 30 is moved to the fixed side claw body 4T (the first claw body) on the inner surface of the opening 4S of the cylindrical protrusion 4. For example, see FIGS. 12 and 13).

The punching machine E is disposed at a position where the cutter axis Z deviates from the pipe axis X of the water pipe W (existing pipe) and overlaps with the water pipe W when viewed in a direction along the cutter axis Z. . By setting the position of the cutter axis Z in this manner, as shown in Fig. 5, when viewed in the direction along the cutter axis Z, the cutter axis Z is located outside the outer surface of the existing pipe. By reducing the radius of the cutter 30, the diameter of the cutter 30 can be suppressed while making it possible to form the perforation opening Wa with the required opening area.

[Ejecting mechanism]
As shown in FIGS. 1, 3, 4, and 6 to 8, the extraction mechanism 40 includes a plate-shaped first support 41 disposed at an upstream position in the direction of the drilling operation inside the case portion C. and a plate-shaped second support 42 disposed at a downstream position in the direction of the drilling operation, and a plurality (three) of rod-shaped position holders that maintain the vertical positional relationship between them. 43, and a bottom plate 44 disposed below the second support 42. These are arranged at positions that can be accommodated in the internal space 30S of the cylindrical cutter 30 when viewed in a direction along the cutter axis Z.

The first support 41 contacts the outer surface of the water pipe W at the edge of the end of the plate, and the second support 42 contacts the outer surface of the water pipe W at the end of the plate in a predetermined area obliquely. contact at the contact surface 42S. The positional relationship of the three position holders 43 is set such that a part of the outer surface contacts the outer surface of the water pipe W. Note that a region of the first support 41 that is close to the outer surface of the water pipe W or that contacts the outer surface of the water pipe W over a predetermined area may be formed. Further, instead of the contact surface 42S, it is also possible to form a plurality of contact points that contact the outer surface of the water pipe W at a plurality of positions.

The bottom plate 44 is disposed so as to be fitted into a recess in the bottom of the case portion C (inner surface of the second divided member 2) in a posture parallel to the second support body 42. This bottom plate 44 is provided with a vertically oriented guide shaft 45, and a second support body 42 is supported with respect to this guide shaft 45 so as to be movable in the vertical direction. Further, the bottom plate 44 is disposed so as to be fitted into a recess at the bottom of the case portion C. Therefore, the postures of the first support body 41, the second support body 42, the three position holding bodies 43, etc. are stabilized.

The area of the first support 41 and the second support 42 that does not come into contact with the water pipe W is circular with the cutter axis Z as the center, and is formed to have an outer diameter that allows it to be close to the inner periphery of the cutter 30. . Further, the bottom plate 44 has a disk shape centered on the cutter axis Z, and the outer circumferential portion is formed to have an outer diameter that allows it to be close to the inner circumference of the cutter 30.

As a result, when the cutter 30 performs a drilling operation, the outer peripheries of the first support 41 and the second support 42 come close to the inner periphery of the cutter 30, and when the cutter 30 reaches the drilling end position, the bottom Plate 44 fits inside cutter 30. Further, as shown in FIGS. 9 and 10, the first support body 41 has a through hole 41a coaxial with the cutter axis Z, and a through hole 41a having an inner diameter equal to that of the through hole 41a is formed on the upper surface of the first support body 41. A cylindrical member 41b is fixedly provided.

As shown in FIG. 7, the three position holders 43 are arranged at set intervals in a direction along the tube axis X, with their respective longitudinal directions parallel to the cutter axis Z. The main position holder 43a at the center of the three position holders 43 has a threaded portion formed at its lower end to be screwed into the screw hole of the second support 42. Further, the main position holding body 43a has a threaded portion at the upper end that penetrates the first support body 41, and a holding nut 46 is screwed into this threaded portion.

Among the three position holders 43, the two sub-position holders 43b that sandwich the main position holder 43a have their upper ends fixed to the first support 41 and their lower ends inserted into the through holes of the second support 42. It functions as a guide body. In addition, the position holding body 43 may be single, and it is also possible to provide three or more numbers.

When the extraction mechanism 40 is provided inside the case part C, the second support 42, the bottom plate 44, and the guide shaft 45 are temporarily assembled, and the water pipe W is connected to the opening 4S of the cylindrical protrusion 4. Set it inside the case part C at the position where the two parts touch each other. Then, the first support body 41 is set so that the lower ends of the two sub-position holders 43b are inserted into the through holes of the second support body 42, and the main position holder 43a is screwed into the screw holes of the second support body 42. Match. In this set state, the bottom plate 44 is fitted into the recess of the bottom part (second divided member 2) of the case part C, so that the first support body 41, the plurality of position holding bodies 43, and the second support body 42 are connected to each other. is placed near the water pipe W.

After that, by rotating the main position holding body 43a, the vertical distance between the first support body 41 and the second support body 42 is adjusted, and the vicinity of the outer circumference of the first support body 41 is moved around the outer surface of the water pipe W. The contact surface 42S of the second support body 42 is brought into contact with the outer surface of the water pipe W. After adjusting the spacing in this way, the spacing is fixed by operating the holding nut 46.

The cutter 30 includes a center support shaft 38 that enters the through hole 41a before the cutter 30 reaches the drilling end position shown in FIG. 4 during the drilling operation. As shown in FIGS. 9 and 10, this center support shaft 38 is provided in the internal space 30S of the cutter 30 coaxially with the cutter axis Z, and this center support shaft 38 performs a return operation after the drilling operation. At this time, an engagement mechanism L is provided to prevent the center support shaft 38 from coming off from the through hole 41a.

[Ejecting mechanism: Engagement mechanism]
As shown in FIGS. 9 and 10, the engagement mechanism L includes a plurality of locking bodies 39 that are swingably supported about the switching support shaft 39a with respect to the center support shaft 38. As shown in FIGS. The locking body 39 can be freely switched between a retracted position in which it is stored inward from the outer circumferential surface of the center support shaft 38 and a locking position in which it protrudes radially outward from the outer circumferential surface of the center support shaft 38 by swinging. It is composed of

The center spindle 38 is also provided with a sleeve 48 on its outer periphery that is slidable between a restraining position that restrains the locking body 39 in the retracted position and a release position that allows the locking body 39 to shift to the locked position. ing. The sleeve 48 is set in the restraining position shown in FIGS. 1 and 9 at the beginning of the drilling operation.

The center support shaft 38 is inserted into the through hole 41a of the first support body 41 as the cutter 30 moves. After this, before the cutter 30 reaches the drilling end position shown in FIG. 4, the cylindrical member 41b of the first support 41 comes into contact with the sleeve 48, as shown in FIG. move it.

This allows the locking bodies 39 to switch to the locking position, and allows the plurality of locking bodies 39 to engage with the lower surface of the first support 41 when the cutter 30 returns. Thereafter, as the cutter 30 returns, the cut portion Wb of the water pipe W, the center support shaft 38, the first support 41, the second support 42, and the position holder 43 are removed as shown in FIG. The cutter 30 is taken out with the bottom plate 44 housed in the internal space 30S of the cutter 30.

[Drilling operation and return operation]
The branch pipe forming device 100 is set up in the case part C, as shown in FIG. In this setup state, the drive unit 33 drives and rotates the cutter 30, and the drilling operation is performed by controlling the cutter 30 to shift from the initial position shown in the figure in the direction of contacting the water pipe W.

When the cutter 30 starts the drilling operation from the initial position, the cutter 30 reaches the drilling end position as shown in FIGS. 3 and 4. After this, the return operation of the cutter 30 is performed, and the cutter 30 returns to the take-out position shown in FIG.

In the drilling machine E, although it is possible that the cutter 30 rotates with a misaligned center during drilling operation, the outer peripheral edge of the guide plate 37 contacts the inner surface of the guide tube 32, so that the accuracy of the center axis during rotation of the cutter 30 is high. maintain. In particular, when the blade portion 30a of the cutter 30 first bites into the water pipe W, the outer peripheral edge of the guide plate 37 is By coming into contact with the inner circumferential surface of the guide tube 32, displacement of the cutter 30 is suppressed and drilling is achieved with high accuracy.

Furthermore, since the inner diameter D3 of the cylindrical protrusion 4 is set larger than the inner diameter D1 of the guide tube 32, the blade portion 30a of the cutter 30 does not come into contact with the fixed claw body 4T on the inner periphery of the cylindrical protrusion 4. Therefore, the fixed side claw body 4T is not damaged by the blade portion 30a of the cutter 30.

In the drilling operation, when the blade portion 30a of the cutter 30 comes into contact with the water pipe W and the drilling progresses, each of the first support body 41, the position holding body 43, and the second support body 42 closes the inner space 30S of the cutter 30. You will be entering into.

As shown in FIG. 5, the positional relationship between the pipe axis X of the water pipe W and the cutter axis Z is set. For this reason, for example, the diameter of the perforation Wa formed by the perforation operation is reduced when viewed in the direction along the cutter axis Z, compared to a configuration in which the cutter axis Z is set externally to the water pipe W. The branch pipe forming device 100 can be downsized. Moreover, since the opening area of the perforation port Wa formed by the perforation operation of the cutter 30 is equal to the flow path cross-sectional area of the insertion tube 3, it is possible to form a branch flow path with no flow path resistance. becomes.

Immediately before the cutter 30 reaches the drilling end position, the center support shaft 38 is inserted into the cylindrical member 41b and the through hole 41a of the first support body 41, as shown in FIG. Due to this insertion, the sleeve 48 comes into contact with the cylindrical member 41b, and the sleeve 48 slides relatively upward, moving from the restraint position to the release position, so that the plurality of locking bodies 39 can be switched to the locking position. It will be done. Then, when the cutter 30 reaches the drilling end position shown in FIG. 4, the drive unit 33 stops the shift operation of the cutter 30, and stops the rotation of the cutter 30.

Next, the drive unit 33 performs a return operation to shift the drive shaft 31 in the opposite direction along the cutter axis Z while the rotation of the drive shaft 31 is stopped.

In this return operation, since the plurality of locking bodies 39 have already been switched to the locking posture, an upward shift force is applied from the plurality of locking bodies 39 to the first support body 41 as the cutter 30 returns. act. As a result, the cut portion Wb of the water pipe W, the first support 41, the second support 42, the position holder 43, and the bottom plate 44 are taken out while being accommodated in the internal space 30S of the cutter 30. will be held.

By this return operation, as shown in FIG. 6, when the cutter 30 returns to the take-out position, the cut portion of the water pipe W is placed in the internal space 30S of the cutter 30 together with the first support 41, the second support 42, etc. Wb is in a housed state. After the drilling of the water pipe W is completed in this manner, the valve body 22 of the valve unit D is operated to the closed position, and the drilling machine E is removed.

[Closure work]
In the closing operation, as shown in FIG. 11, the closing unit F is first placed in the upper cylindrical portion 21c of the upper wall of the valve unit D with the valve body 22 of the valve unit D maintained in the closed position. Next, as shown in FIG. 12, the valve body 22 of the valve unit D is opened, and the plugging disc 10 is fitted into the opening 4S of the cylindrical projection 4 by the closing unit F, and as shown in FIGS. 14 and 15, This opening 4S is closed. After these series of operations, the valve unit D and the closing unit F are removed as shown in FIG. This series of operations will be explained below.

As shown in FIGS. 11 and 12, the closing unit F includes a main plate 50 that is connected and fixed to the flange of the upper cylindrical portion 21c of the upper wall of the valve unit D, and a main plate 50 that extends vertically through the center of the main plate 50. It includes a penetrating operating shaft 51 and an upper bracket 52 supported on the upper end of the operating shaft 51.

A rotation operation section 51a is formed at the upper end of the operation shaft 51. The upper bracket 52 allows the operating shaft 51 to rotate while preventing upward displacement of the operating shaft 51.

The operating shaft 51 is arranged coaxially with the cutter axis Z, with the main plate 50 being connected and fixed to the flange portion of the upper cylindrical portion 21c by a plurality of bolts. The operating shaft 51 is supported by a bush 50a fixed to the main plate 50 so as to be movable in a direction along the cutter axis Z and rotatable about the cutter axis Z. Note that a sealing member or the like is provided between the inner circumferential surface of the bush 50a and the operating shaft 51 to prevent water from leaking.

The main plate 50 includes a plurality of lower holders 50b on its upper surface. Further, the upper bracket 52 includes a plurality of upper holders 52a on the lower surface. This closing unit F has a wire 53 stretched between a hole in a lower holder 50b and a hole in an upper holder 52a, and the tension of the wire 53 is applied to an operating member 54 such as a lever block (registered trademark). By increasing this, the operating shaft 51 can be shifted downward.

The closing unit F includes a lower bracket 55 formed at the upper end of the bush 50a and a pair of threaded shafts 56 that vertically penetrate through the upper bracket 52, and an upper nut 56a that is screwed into the upper end of the threaded shafts 56. It is provided in contact with the upper surface of the upper bracket 52.

In this closing unit F, as shown in FIG. 11, before being fixed to the upper cylindrical portion 21c, a closing disk 10 is supported at the lower end of an operating shaft 51. Specifically, the female screw portion of the fitting portion 51b at the lower end of the operating shaft 51 is screwed into the operating protrusion 14 of the capping disc 10, so that the capping disc 10 is supported on the lower end of the operating shaft 51.

As shown in FIG. 13, the closure disc 10 includes a closure body 11 that fits into the opening 4S, a closure plate 12 at the upper end of the closure body 11, and a plurality of holes formed on the outer surface of the small diameter portion at the lower end of the closure body 11. (four) movable claw bodies 11T (an example of a second claw body). Further, a seal ring 13 is fitted into a groove on the outer periphery of the plug body 11.

Further, in the closure disc 10, an operating protrusion 14 is formed on the top surface of the closure plate 12 and projects upward. The operation protrusion 14 has a fitting structure that rotates the stopper plate 12 by the torque of the rotation operation. As a specific example of this fitting structure, the operating protrusion 14 is formed with a male threaded portion (it may be cut on two sides or shaped like a bolt head).

As shown in FIGS. 13 to 15, the cylindrical protrusion 4 includes a plurality (four) of fixed claw bodies 4T that protrude inward from the inner peripheral surface of the opening 4S at set intervals along the circumferential direction. ing. The plurality of fixed-side claw bodies 4T and the plurality of movable-side claw bodies 11T are formed in a posture parallel to a virtual plane orthogonal to the cutter axis Z. As shown in FIG. 14, the positional relationship between the movable claw bodies 11T is set such that each of the movable claw bodies 11T fits into a circumferential gap between the fixed claw bodies 4T.

Specifically, when viewed in a direction along the cutter axis Z, the distance between adjacent fixed claw bodies 4T in the circumferential direction is set to be larger than the length in the circumferential direction of the plurality of movable claw bodies 11T. has been done. Further, a stopper 4TS is formed at the end position of the fixed side pawl body 4T in order to restrict the rotational operation when the rotation angle reaches the point where the fixed side pawl body 4T and the movable side pawl body 11T contact each other at the widest surface. There is.

In the closing operation, as shown in FIG. 11, after fixing the main plate 50 to the upper cylindrical part 21c, the valve body 22 of the valve unit D is opened, and the upper nuts 56a are screwed onto each of the pair of threaded shafts 56. or by operating the aforementioned operating member 54, the tension acting on the wire 53 is increased. As a result, as shown in FIG. 12, the upper bracket 52 is shifted downward, and the closure disc 10 is shifted downward together with the operating shaft 51 against the water pressure, so that the closure disc 10 opens the cylindrical protrusion 4. Fitted into 4S.

In this closure operation, when the closure disc 10 is shifted downward together with the operating shaft 51, it is also necessary to increase the pressure in the space above the closure disc 10. For this reason, as shown in FIGS. 11 and 12, the branch pipe forming device 100 allows pressurized water to be supplied from the plug 21d formed in the upper cylindrical portion 21c. Further, the closed state can be confirmed by checking whether or not water leaks from the part of the plug 21d.

When the closure disc 10 is fitted into the opening 4S, a rotational attitude about the cutter axis Z is set in advance so that the movable claw body 11T does not come into contact with the fixed claw body 4T. After fitting the capping disc 10 into the opening 4S, the capping disc 10 is rotated at low speed while applying slight downward pressure, and the movable claw 11T is inserted into the space between the plurality of fixed claws 4T. It is also possible to set the working configuration so that when the movable side claw body 11T reaches a position where it can be inserted, the movable side claw body 11T is inserted into the space between the plurality of fixed side claw bodies 4T by the pressure acting downward. .

Furthermore, by shifting the upper bracket 52 downward, the closure disc 10 is fitted along the cutter axis Z, and the positional relationship between the fixed side pawl 4T and the movable side pawl 11T is determined, as shown in FIG. In this state, the rotation operation portion 51a at the upper end of the operation shaft 51 is rotated using a tool such as a spanner. By this rotation operation, as shown in FIG. 15, the plurality of movable claw bodies 11T move below the plurality of fixed claw bodies 4T, and by rotating the movable claw bodies 11T until it comes into contact with the stopper 4TS. , the bayonet-shaped closure disc 10 is set to prevent it from coming off. Incidentally, the rotation angle of the closure disc 10 is set to about 45 degrees as shown in FIG. 13.

As shown in FIG. 16, after the opening 4S is closed with the closure disc 10, the valve unit D and the closure unit F are removed.

[Operations and effects of the embodiment]
A dimensional relationship is set such that the inner diameter D1 of the guide cylinder 32 and the outer diameter D2 of the guide plate 37 are close to each other so that they can come into contact with each other (D1≈D2). In this way, the gap between the outer periphery of the guide plate 37, which rotates integrally with the cutter 30, and the inner surface of the guide tube 32 is very small. Therefore, when the blade portion 30a of the cutter 30 first bites into the water pipe W during the drilling operation, the outer peripheral edge of the guide plate 37 comes into contact with the inner peripheral surface of the guide cylinder 32, so that the cutter 30 can cut into the water pipe W. The outward displacement of sliding along the surface is restricted, and the cutter 30 can perform drilling with high axial accuracy.

The dimensional relationship is set such that the inner diameter D3 of the opening 4S of the cylindrical protrusion 4 is larger than the inner diameter D1 of the guide tube 32 and the outer diameter D2 of the guide plate 37 (D3>D1≈D2). Due to this dimensional relationship, even if the cutter 30 rotates with some center deviation during drilling operation, the guide plate 37 will not come into contact with the inner surface of the guide tube 32, and the cutter 30 will be able to move to the fixed side claw on the inner surface of the opening 4S. There will be no inconvenience that may damage the 4T.

The main position holding body 43a of the position holding body 43 is configured to adjust the distance in the vertical direction between the first support body 41 and the second support body 42 constituting the extraction mechanism 40. Moreover, this extraction mechanism 40 is arranged at a position where a plurality of position holders 43 contact the outer surface of the water pipe W.

By adjusting the position using the main position holding body 43a, each of the first support body 41 and the second support body 42 is brought into reliable contact with the outer surface of the water pipe W. Further, the plurality of position holding bodies 43 maintain a state in which they are in contact with the outer surface of the water pipe W. Thereby, the postures of the first support body 41, the second support body 42, and the position holding body 43 are stabilized.

With this extraction mechanism 40, the cut portion Wb of the water pipe W, the first support 41, the second support 42, the position holder 43, and the bottom plate 44 are removed from the inside of the cutter 30 by the return operation of the cutter 30. Reliable removal is possible in the state accommodated in the space 30S.

In this branch pipe forming device 100, after forming a perforation Wa in a water pipe W, a closure disc 10 (an example of a closure body) is inserted into an opening 4S of a cylindrical protrusion 4 using a closure unit F. The cap can be closed by rotating the disc 10.

In other words, a bayonet-type retaining mechanism is formed by a plurality of fixed claws 4T formed on the inner periphery of the opening 4S of the cylindrical protrusion 4 and a plurality of movable claws 11T formed on the outer periphery of the closure disc 10. By rotating the closure disc 10, it is possible to achieve reliable prevention of slippage despite its small size.

[Another embodiment]
In this other embodiment, in addition to the embodiment described above, the configuration may be as follows (those having the same functions as the embodiment are given the same numbers and symbols as the embodiment).

(a) As shown in FIG. 17, the branch pipe forming device 100 may include a sweep mechanism G that discharges chips generated during drilling by the cutter 30 to the outside of the case portion C. The work of discharging the chips inside the case part C by the sweep mechanism G is called a sweep work, and this sweep work is performed before the opening 4S of the cylindrical protrusion 4 is closed with the closure disc 10 by the closure unit F. It will be done.

As shown in FIG. 18, in this alternative embodiment (a), in order to enable the sweeping operation, an insertion hole 10a is formed in the center of the closure disc 10, and a sweep tube 61 is inserted into this insertion hole 10a. Work is done in form. In the sweep operation, the sweep tube 61 is supported by a ball joint 60 provided in the insertion hole 10a so as to be able to change its posture in order to enable the sweep tube 61 to discharge chips from a wide area at the bottom of the case portion C.

As shown in FIG. 17, the sweep mechanism G includes the above-described ball joint 60 and the sweep tube 61, and also includes a main plate 50, a rod-shaped body 64, and a hole in the lower holder 50b of the main plate 50. A wire 53 that is stretched across the hole of the holder 64a of the rod-shaped body 64 and an operating member 54 such as a lever block (registered trademark) are used.

As shown in FIG. 18, the ball joint 60 includes an outer sleeve 60a and a joint main body 60b having a spherical outer surface and accommodated inside the outer sleeve 60a so as to be able to change its posture.
The external sleeve 60a has a male threaded portion formed on its outer periphery, and this male threaded portion is screwed into the upper side of the female threaded portion on the inner surface of the insertion hole 10a of the closure disc 10. The joint body 60b is configured such that the sweep tube 61 can be inserted therethrough in a watertight manner.

The sweep tube 61 includes a stopper member 62 at its lower end, and a cock 63 at its upper end that opens and closes the internal flow path by manual operation of a lever 63a (see FIG. 17). The plug member 62 is detachably supported by a pin (not shown) at the tip of the sweep tube 61 via a structure that secures a water flow path to the internal flow path of the sweep tube 61 . Further, the upper end side of the sweep tube 61 is supported by the rod-shaped body 64 described above.

The plug member 62 is disk-shaped, has a male threaded portion formed on its outer periphery, and is configured to be able to be screwed onto the lower side of the female threaded portion on the inner surface of the insertion hole 10a of the plugging disc 10. In this alternative embodiment (a), a series of operating procedures from insertion of the sweep tube 61 to removal of the sweep tube 61 are shown in FIGS. 17 to 21. Note that this series of operations is performed manually.

(a-1) When performing the sweep operation, as a preparatory operation, with the valve body 22 of the valve unit D maintained in the closed position, the plugging disk 10 is fixed by screws 65 penetrating from the upper surface to the lower surface of the main plate 50. is fixed to the lower surface of the main plate 50. Further, as shown in FIGS. 17 and 18, the sweep tube 61 is inserted into the insertion hole 10a of the closure disc 10 via the ball joint 60, and the holder 64a of the rod-shaped body 64 is inserted through the hole of the lower holder 50b of the main plate 50. A wire 53 is stretched across the hole.

(a-2) Next, as shown in FIG. 19, the valve body 22 of the valve unit D is opened, and the tension of the wire 53 is increased by the operating member 54, thereby resisting water pressure as shown in FIG. The sweep tube 61 is brought close to the inner surface of the bottom of the case portion C. When the cock 63 is opened by operating the lever 63a in this close state, a part of the water flowing into the water pipe W flows into the internal flow path of the sweep tube 61, and with this flow, chips are discharged from the upper end of the sweep tube 61. Ru. Further, by artificially changing the angle of the sweep tube 61, chips can be discharged from a wide area on the inner surface of the bottom of the case portion C.

(a-3) After this, the cock 63 is closed, the tension of the wire 53 is reduced, the sweep tube 61 is shifted upward by water pressure, and the valve body 22 is placed in the closed position as shown in FIG. With the member 62 fitted into the insertion hole 10a of the closure disc 10, the sweep tube 61 is rotated. By this rotation operation, the male threaded portion of the plug member 62 is screwed into the lower side of the female threaded portion of the insertion hole 10a, and the insertion hole 10a is closed by the plug member 62.

As described above, after the plug member 62 is threaded onto the closure disc 10, the pin is removed and the sweep tube 61 is separated from the plug member 62. After this, the wire 53 and the like will be removed.

(a-4) Subsequently, by rotating the outer sleeve 60a of the ball joint 60 as shown in FIG. Separate from the top side. By this separation, the joint body 60b is separated integrally from the outer sleeve 60a. After this separation, an operation is performed in which the male threaded portion of the fixing member 14M having the operating protrusion 14 is screwed into the upper side of the female threaded portion of the insertion hole 10a.

In this way, in another embodiment (a), the insertion hole 10a is formed in the closure disc 10 and a part of the configuration of the closure unit F is used to discharge chips inside the case part C using the sweep tube 61. It has been realized.

As shown in FIG. 21, the fixing member 14M screwed onto the upper side of the female threaded portion of the insertion hole 10a when the valve body 22 is placed in the closed position has the operating protrusion 14. As already explained in the section ``Work'', the bush 50a is fixed to the main plate 50 coaxially with the cutter axis Z, and the bush 50a is movable in the direction along the cutter axis Z with respect to the bush 50a. The operating shaft 51 is supported rotatably around the axis Z.

Furthermore, the fitting portion 51b of the operating shaft 51 is screwed into the operating protrusion 14 of the closure disc 10, and the closure disc 10 is separated from the main plate 50 by operating the screw 65, and the screw hole is closed with a plug. By opening the work valve, the closing operation becomes possible, and by performing the operation according to the procedure described in the [Closing Operation] section, the opening 4S of the cylindrical protrusion 4 can be closed with the plugging disc 10.

(b) As shown in FIG. 28, a case portion C is provided on the outer surface of a water pipe W as an existing pipe, a valve unit D is provided at the upper end of the cylindrical protrusion portion 4 of the case portion C, and a valve unit D is provided on the upper surface of the valve unit D. In the branch pipe forming apparatus 100 equipped with the punching machine E, a method of attaching the extraction mechanism 40 (an example of a section collector) shown in FIGS. 24 to 26 is set.

The branch pipe forming device 100 in the attachment method of this alternative embodiment (b) is basically the same as that already explained in the above embodiment, and a part of the configuration of the extraction mechanism 40 (section collector) is This is different from the configuration already described. In this mounting method, the "arranging step" (FIGS. 22 to 26) in which the ejecting mechanism 40 is arranged and the "centering step" in which the through hole 41a of the first support body 41 of the ejecting mechanism 40 is set coaxially with the cutter axis Z "Exit process" (FIGS. 26 and 27) are performed in this order.

As shown in FIGS. 28 to 31, the drilling machine E includes a cylindrical cutter 30 coaxial with the cutter axis Z, a drive shaft 31, and a guide tube 32. The cutter 30 includes a drive plate 36 and a guide plate 37 at the upper end (the end opposite to the blade portion 30a). The drive plate 36 is partially fitted into the upper end of the cutter body 30b and is connected to the cutter body 30b. The guide plate 37 has a disk shape with a larger diameter than the outer shape of the cutter body 30b, and the outer periphery of the guide plate 37 is close to the inner surface of the guide cylinder 32.

Further, a center support shaft 38 is provided that projects downward from the lower surface of the drive plate 36 and is coaxial with the cutter axis Z. This center support shaft 38 is provided with an engagement mechanism L that enables the extraction mechanism 40 to be taken out by engaging with the through hole 41a of the extraction mechanism 40 when performing a return operation after the drilling operation. This through hole 41a has a circular cross-sectional shape.

As already shown in FIGS. 9 and 10 of the embodiment, the engagement mechanism L includes a plurality of locking bodies 39 that are swingable about the switching support shaft 39a with respect to the center support shaft 38. The locking body 39 can be freely switched between a retracted position in which it is stored inward from the outer circumferential surface of the center support shaft 38 and a locking position in which it protrudes radially outward from the outer circumferential surface of the center support shaft 38 by swinging. It is composed of

Moreover, the center support shaft 38 is slidable between a restraining position where the locking body 39 is restrained in the retracted position shown in FIG. 9 and a release position where the locking body 39 is allowed to shift to the locked position shown in FIG. A flexible sleeve 48 is provided on the outer periphery. The sleeve 48 is set to the restraining position shown in FIGS. 28 and 29 at the beginning of the drilling operation.

The perforator E forms a perforation Wa in the water pipe W (existing pipe) by a perforation operation in which the cutter 30 is driven and rotated and moved from the initial position shown in FIG. 28 in the perforation direction (downward in the figure). . After the cutter 30 reaches the perforation end position shown in FIG. 30 through this perforation operation, the cutter 30 performs a return operation in the opposite direction to the perforation operation.

The punching machine E is equipped with a take-out mechanism 40 that takes out the cut portion Wb (section) separated from the water pipe W during the return operation while being accommodated in the internal space 30S of the cutter 30. By providing this take-out mechanism 40, when the cutter 30 reaches the take-out position shown in FIG. 31, the cut portion Wb separated from the water pipe W is taken out while being accommodated in the internal space 30S of the cutter 30.

As shown in FIGS. 22 to 26, the extraction mechanism 40 has a first support 41 located upstream in the direction of the drilling operation and a second support 42 located downstream in the direction of the drilling operation inside the case portion C. It is equipped with two supports. Furthermore, the take-out mechanism 40 includes a plurality of (three) rod-shaped position holding bodies 43 that maintain the vertical positional relationship between the first support body 41 and the second support body 42, and a position holding body 43 located below the second support body 42. A bottom plate 44 is provided.

The first support body 41, the second support body 42, and the plurality (three) rod-shaped position holding bodies 43 can be accommodated in the internal space 30S of the cylindrical cutter 30 when viewed in the direction along the cutter axis Z. placed in a suitable position.

As shown in FIGS. 24 to 26, in this alternative embodiment (b), the first support body 41 includes an upper plate 41P, a lower plate 41Q, and a connecting cylinder 41R that connects these. The upper plate 41P is formed into a disk shape with a radius close to the inner surface of the cutter 30. The lower plate 41Q has a smaller diameter than the upper plate 41P, and is formed in a size that allows the end portion on the side closer to the water pipe W (opposite the position holding body 43) to come into contact with the outer surface of the water pipe W.

The connecting cylinder 41R is a cylindrical body connected to the upper plate 41P and the lower plate 41Q, and the center of the connecting cylinder 41R is arranged coaxially with the cutter axis Z. In particular, before the cutter 30 reaches the drilling end position shown in FIG. (see FIGS. 9 and 10) reaches a locked position in which it extends radially outward from the outer peripheral surface of the center support shaft 38. At this time, as shown in FIG. 29, the upper plate 41P approaches the inner surface of the cutter 30, and the outer periphery of the guide plate 37 approaches the inner surface of the guide tube 32, so that misalignment of the cutter 30 due to the drilling operation can be prevented. .

The upper plate 41P and the lower plate 41Q are parallel to each other, and an upper through hole is formed in the upper plate 41P, parallel to the cutter axis Z and centered on the central axis that is spaced from the water pipe W in plan view. A lower through hole 41Qa having a smaller diameter than this is formed in the lower plate 41Q.

As shown in FIGS. 22 to 26, the second support 42 has a contact surface 42S formed in a region along the outer surface of the water pipe W that is inclined along the outer periphery of the water pipe W. Further, the second support body 42 is formed with a radius such that the outer periphery that is spaced apart from the water pipe W in plan view is close to the inner surface of the cutter 30.

A guide shaft 45 extends vertically through the center of the second support 42 . A nut is screwed into the female threaded portion of the guide shaft 45 at the lower end. The head at the upper end of this guide shaft 45 is circular in plan view, and the outer periphery of the upper surface is chamfered.

As shown in FIGS. 24 and 25, the second support 42 has a threaded portion 42a formed of a vertical screw hole formed in a region along the outer periphery of the water pipe W in a plan view. A holding cylinder 42g extending upward is fixed at two sandwiched locations. These threaded portions 42a and the pair of holding cylinders 42g are arranged in a linear region along the outer periphery of the water pipe W in plan view.

The bottom plate 44 is formed into a disk shape with a slightly larger diameter than the outer diameter of the cutter 30. The bottom plate 44 has a fitting recess formed in the center thereof into which the lower end of the guide shaft 45 fits.

The three position holders 43 are rod-shaped as a whole, and are arranged at set intervals with their longitudinal directions parallel to the cutter axis Z. That is, the position holding body 43 has a single main position holding body 43a and a pair of sub position holding bodies 43b.

The single main position holder 43a is formed with an upper screw 43at having a smaller diameter than the main body portion, and a lower screw 43ab having a smaller diameter than the main body portion. As shown in FIG. 27, the main position holder 43a has a hexagonal hole 43ac formed at the upper end of the upper screw 43at.

As shown in FIGS. 24 and 27, the upper screw 43at of the main position holder 43a is inserted into the lower through hole 41Qa, and the holding nut 46 is screwed into the upper screw 43at. Further, in this main position holding body 43a, a lower screw 43ab is screwed into the threaded portion 42a of the second support body 42. The upper through hole (through hole 41a of the upper plate 41P) is formed with an inner diameter that allows rotation of the holding nut 46.

As shown in FIGS. 24 and 25, in the first support body 41, a sub-position holder 43b is supported at two locations sandwiching the main position holder 43a between an upper plate 41P and a lower plate 41Q. The pair of sub-position holders 43b have upper ends fixed to the upper plate 41P by a technique such as welding, and lower ends inserted into a holding tube 42g provided in the second support 42.

The holding nut 46 can be screwed into the upper screw 43at while being inserted into the lower through hole 41Qa of the lower plate 41Q. Further, the lower screw 43ab is formed to be able to be screwed into the screwing portion 42a of the second support 42.

Among the three position holders 43, the secondary position holders 43b are welded and fixed to the upper plate 41P of the first support 41 at two positions sandwiching the main position holder 43a, and the lower ends are fixed to the second support 42 by welding. It is inserted into the cylinder 42g so as to be relatively movable in the vertical direction.

[How to install the ejection mechanism]
In this alternative embodiment (b), the method for attaching the retrieval mechanism 40 (section collector) includes an "arrangement step" of arranging the retrieval mechanism 40 (section collector) from the cylindrical protrusion 4 into the case part C. , Fix the relative position of the extraction mechanism 40 with respect to the water pipe W (existing pipe) using the centering jig 70 so that the cutter axis Z is coaxial with the through hole 41a formed in the connecting cylinder 41R of the extraction mechanism 40. A "centering process" is performed.

Attachment of the extraction mechanism 40 by this attachment method is performed after the operation of arranging the case portion C on the outer surface of the water pipe W at the position where the perforation Wa is formed by the perforation machine E.

[Installation method: placement process]
In the arrangement process, as shown in FIG. 22, first, the bottom plate 44 and the second support 42 are assembled so that the guide shaft 45 is inserted therein, and then the bottom plate 44 and the second support 42 are manually removed from the cylindrical protrusion 4. The plate 44 is disposed so as to be fitted into the recess in the bottom of the case portion C (inner surface of the second divided member 2). With this arrangement, the contact surface 42S of the second support 42 enters below the outer periphery of the water pipe W.

Next, as shown in FIGS. 23 and 27, in a state where the lower screw 43ab of the main position holder 43a is screwed into the threaded part 42a of the second support 42, the hexagonal A shifting tool T1 such as a wrench is fitted into the hole 43ac, and the second support body 42 is shifted upward by a rotation operation, so that the contact surface 42S lightly contacts the lower surface of the water pipe W. In this rotation operation, the main position holding body 43a rotates.

Next, as shown in FIGS. 24 and 25, the first support body 41 and the position holding body 43 are inserted from the cylindrical protrusion 4, and the upper end of the main position holding body 43a is inserted through the lower part of the first support body 41. It is inserted into the hole 41Qa. At the same time, the lower end portions of the pair of sub-position holders 43b are inserted into corresponding ones of the holding tubes 42g of the second support 42.

In the positional relationship in which the first support body 41, the second support body 42, and the position holding body 43 are arranged in this way, the holding nut 46 is screwed onto the upper screw 43at of the main position holding body 43a, as shown in FIG. By rotating this holding nut 46 using a fastening tool T2 such as a wrench, a part of the lower plate 41Q of the first support body 41 is brought into light contact with the upper surface of the water pipe W (see also FIG. 26).

[Installation method: centering process]
As shown in FIGS. 26 and 27, in the centering step, as described above, a part of the lower plate 41Q is brought into light contact with the upper surface of the water pipe W, and the contact surface of the second support 42 is 42S in light contact with the lower surface of the water pipe W, use the centering jig 70 shown in FIG. Match.

The centering jig 70 includes a gauge shaft 71 with a circular cross-sectional shape that can be tightly fitted into the connecting cylinder 41R of the first support body 41, a cross plate 72 that supports the gauge shaft 71, and a cross plate 72 that is attached to both ends of the cross plate 72. The regulating member 73 is provided with a plurality of position holding bolts 74. The gauge shaft 71 is formed into a tapered shape with a smaller diameter on the lower end side.

The cylindrical protrusion 4 has a cylindrical shape that is coaxial with the cutter axis Z, and the cylindrical protrusion 4 is formed with an opening 4S that passes through it in the vertical direction.

The cross plate 72 is arranged along the diameter direction of the opening 4S. In this arrangement, the position holding bolt 74 of the regulating member 73 comes into contact with the outer periphery of the cylindrical protrusion 4, so that the center of the gauge shaft 71 is arranged coaxially with the cutter axis Z.

The two-dot chain line in FIG. 26 shows the first support 41 in a state where centering has been completed. In the centering process, for example, the gauge shaft 71 is gradually inserted into the connecting cylinder 41R by shifting the centering jig 70 downward, and an artificial external force is applied to the first support body 41. The position of this first support body 41 is adjusted.

By using the centering jig 70 in this manner, the extraction mechanism 40 can arrange the center of the connecting cylinder 41R coaxially with the cutter axis Z. In this centering process, with the centering jig 70 attached, the position of the first support body 41 with respect to the case part C is determined by tightening the holding nut 46 of the take-out mechanism 40, and the centering state is fixed. Then, the centering jig 70 is removed. By completing this centering process, a state is reached where the contact surface 42S of the second support 42 reliably contacts the outer surface of the water pipe W.

Next, after the extraction mechanism 40 (slice collector) is attached, the valve unit D is fixed to the upper surface of the protruding side flange portion 4a formed on the cylindrical protruding portion 4, as described in the embodiment described above. A drilling machine E is fixed to the upper surface of this valve unit D.

That is, when drilling with the drilling machine E, the cutter 30 is rotated around the cutter axis Z and operated in the drilling direction (downward) from the initial position shown in FIG. The drilling of the water pipe W by the water pipe W is started.

When drilling is started in this way, the upper plate 41P of the first support 41 enters the inner periphery of the cutter 30, and as shown in FIG. Since the positional relationship is maintained by the guide plate 37 being close to the guide cylinder 32, the cutter 30 can be maintained at an appropriate position.

Thereafter, when the cutter 30 reaches the vicinity of the drilling end position, the center support shaft 38 enters the connecting cylinder 41R. As a result, the upper end of the connecting cylinder 41R comes into contact with the sleeve 48, and the sleeve 48 is moved to the release position. After this, as shown in FIG. 30, after the cutter 30 reaches the drilling end position, the plurality of locking bodies 39 shift to the locking position.

Moreover, when the cutter 30 reaches the drilling end position in this way, the cut portion Wb of the water pipe W is accommodated in the internal space 30S of the cutter 30 together with the first support 41, the second support 42, etc. It is in.

When the cutter 30 returns to the take-out position shown in FIG. The cutter 30 is taken out in a state where the cutter 30 is accommodated in the internal space 30S.

By performing the "centering step" after the "arrangement step" of arranging the take-out mechanism 40 as in this other embodiment (b), the cutter axis Z and the connecting cylinder 41R of the first support body 41 penetrate through each other. The center of the hole 41a is made to coincide with the center of the hole 41a with high precision. As a result, the extraction mechanism 40 and the punching machine E are maintained in a preset optimal positional relationship with respect to the case portion C.

In particular, in this configuration, the accuracy of the positional relationship between the outer periphery of the upper plate 41P and the inner periphery of the cutter 30 is increased so that the upper plate 41P of the first support body 41 can be accommodated in the internal space 30S of the cutter 30. It turns out.

Further, in the drilling operation of the drilling machine E, even in a situation where a force acts in a direction to separate the cutter 30 from the water pipe W, such as when the blade portion 30a of the cutter 30 comes into contact with the water pipe W, the inside of the cutter 30 By contacting the outer periphery of the upper plate 41P with the periphery, the cutter 30 can be rotated around the cutter axis Z. When the drilling is completed, the cutting portion Wb and the cutter 30 rotate together.

Furthermore, in this alternative embodiment (b), since the center support shaft 38 can be reliably introduced into the through hole 41a, when the cutter 30 is returned to the hole position after the cutter 30 reaches the drilling end position, It becomes possible to take out the cut portion Wb of the water pipe W while it is accommodated in the internal space 30S of the cutter 30. Note that the method for attaching the extraction mechanism 40 (slice collector) in another embodiment (b) can also be adopted for the extraction mechanism 40 in the above-described embodiment.

(c) The guide plate 37 is not limited to a disk shape, and for example, a polygonal plate may also be used. In this manner, in the case of a polygonal plate, a plurality of corners or the like are arranged in such a positional relationship that the position furthest away from the cutter axis Z in the radial direction and the inner surface of the guide tube 32 are close enough to be in contact with each other.

(d) For contact, which contacts the water pipe W with a predetermined area, similar to the contact surface 42S of the second support 42, at a position of the first support 41 of the extraction mechanism 40 that contacts the water pipe W. form a surface. By forming the contact surface in this way, the posture of the first support body 41 is stabilized and drilling is performed in a good positional relationship, and the cut portion Wb of the water pipe W and the first support body are It becomes possible to more reliably take out the body 41, the second support body 42, the position holding body 43, and the bottom plate 44 in a state where they are accommodated.

(e) The fixed side claw body 4T and the movable side claw body 11T described in the embodiment are assumed to be formed in a posture parallel to a virtual plane perpendicular to the cutter axis Z, but rotation operation At least one of the fixed side claw body 4T and the movable side claw body 11T is formed in a posture inclined with respect to the above-mentioned virtual plane so as to apply a force in the direction of fitting the closure disc 10 into the opening 4S. can also be considered.

With this configuration, the operation shaft 51 can be displaced in the fitting direction of the closure disc 10 simply by applying a rotational force from the operation shaft 51 without applying a force to shift the operation shaft 51 in the direction along the cutter axis Z. Can be reliably closed.

(f) In the embodiment described above, the guide plate is used in the half-cut construction method in which the cutter axis Z is located at a position away from the pipe axis X of the water pipe W (existing pipe) and overlaps with the water pipe W. 37 was adopted. This guide plate 37 may be used in a half-cut method in which the cutter axis Z is outside the outer peripheral surface of the water pipe W, or can be used in any drilling machine E such as a top-cut method, a full-cut method, a horizontal drilling method, etc. can.

It should be noted that the configuration disclosed in the above embodiment (including other embodiments, the same applies hereinafter) can be applied in combination with the configuration disclosed in other embodiments, as long as there is no contradiction, and The embodiments disclosed in this specification are illustrative, and the embodiments of the present invention are not limited thereto, and can be modified as appropriate without departing from the purpose of the present invention.

INDUSTRIAL APPLICATION This invention can be utilized for the attachment method of a branch pipe forming apparatus and a section collector.

3 Insertion tube (branch)
4S Opening 4T Fixed side claw body (first claw body)
10 Closure body 11T Movable claw body (second claw body)
30 Cutter 30S Internal space 31 Drive shaft 32 Guide tube 37 Guide plate 38 Center shaft 39 Locking body 40 Retrieval mechanism (section collector)
41 First support body 41a Through hole 42 Second support body 42S Contact surface 43 Position holding body 48 Sleeve 70 Centering jig 100 Branch pipe forming device C Case part E Punching machine L Engagement mechanism W Water pipe (existing pipe)
Wa Drilling hole Wb Cutting section X Pipe shaft center Z Cutter shaft center

Claims (9)

The method includes a case part that is attached to the outer surface of the existing pipe in a non-flow state, and a drilling machine that forms a hole in a part of the existing pipe, and the case part has a branch part that can communicate with the hole. A branch pipe forming device comprising:
The drilling machine includes a cylindrical cutter, a drive shaft that drives and rotates the cutter around the cutter axis and reciprocates the cutter in a direction along the cutter axis, and the cutter axis is the center of the drilling machine. A guide tube having a cylindrical shape and capable of accommodating the cutter, and a guide plate disposed on the opposite side from the blade portion of the cutter and having an outer end in the radial direction protruding outward from the outer periphery of the cutter,
In the drilling operation of forming the hole in the existing pipe with the cutter, when the blade portion first bites into the existing pipe, the guide plate is in contact with the inner circumferential surface of the guide tube. A branch pipe forming device, wherein the guide plate is provided at a position in contact with the guide plate. The branch pipe formation according to claim 1, wherein the cutter axis is disposed at a position that is offset from the tube axis of the existing pipe and overlaps with the existing pipe when viewed in a direction along the cutter axis. Device. The case part has a take-out mechanism that accommodates the cut portion separated from the existing pipe by the drilling operation in the internal space of the cutter and takes out the cut portion while being accommodated in the cutter with the return operation of the cutter. The branch pipe forming device according to claim 1 or 2. The take-out mechanism includes at least two supports, a first support body disposed at an upstream position in the direction of the punching operation, and a second support body disposed at a downstream position in the direction of the punching operation, inside the case part. two supports and a position holding body that maintains the vertical positional relationship thereof are arranged inside the cutter,
The first support is formed with a through hole coaxial with the cutter axis,
The cutter includes a center support shaft coaxial with the cutter shaft that enters the through hole before the cutter reaches the end position of the drilling operation, and is provided in the inner space of the cutter;
4. The branch pipe forming apparatus according to claim 3, wherein the take-out mechanism includes an engagement mechanism that prevents the center spindle from coming out of the through hole when performing the return operation after the drilling operation. A locking body in which the engagement mechanism can be freely switched between a storage position in which the engagement mechanism is stored inward from the outer peripheral surface of the center support shaft and a locking position in which it extends radially outward from the outer peripheral surface of the center support shaft. is provided on the center support shaft, and by sliding in a direction along the cutter axis, a restraining position where the locking body is restrained in the storage position and a transition of the locking body to the locking position are allowed. A sleeve that can be freely switched between the release position and the release position is provided on the outer periphery of the center spindle,
The engagement mechanism starts the drilling operation with the sleeve set in the restraining position, and moves the cutter to the terminal position of the drilling operation with the center spindle inserted into the through hole. Before reaching the position, a part of the first support comes into contact with the sleeve and moves it to the release position, thereby allowing the locking body to switch to the locking position, and when the cutter returns to the position, 5. The branch pipe forming device according to claim 4, wherein the locking body engages with the first support, thereby causing the center support shaft and at least two of the supports to integrally perform the return operation. At least one of the first support and the second support of the extraction mechanism has a contact surface that can make surface contact with the outer surface of the existing pipe, or has a plurality of contacts that make contact at a plurality of positions. The branch pipe forming device according to claim 5, having a dot. The case portion has a circular opening that allows the cutter of the drilling machine to be inserted and removed, and has a structure that allows the opening to be closed with a closure body after the drilling machine is removed,
The opening has a plurality of first claw bodies on an inner periphery, and the closure body has a second claw body that engages with the plurality of first claw bodies by rotation about the center of the opening and reaches a locking state. The branch pipe forming device according to claim 1 or 2. A section collector is attached to a branch pipe forming device that is equipped with a case part that is attached to the outer surface of an existing pipe in a non-flow state, and the case part has a branch part that can communicate with a perforation hole formed by a perforator. A method for installing a section collector, the method comprising:
arranging the section collector inside the case part;
a centering step of fixing the relative position of the section collector with respect to the existing pipe using a centering jig so that the cutter axis of the punching machine is coaxial with the through hole formed in the section collector; How to install the section collector, including: The section collector includes a first support disposed at an upstream position in the direction of the drilling operation of the drilling machine, and a second support body disposed at a downstream position in the direction of the drilling operation and in which the through hole is formed. and a position holding body that maintains the vertical positional relationship of these supports,
In the arrangement step, after connecting the first support and the position holder to the second support placed on the bottom of the case part, the first support is connected to the first support by operating the position holder. The method for attaching a section collector according to claim 8, wherein the second support is moved close to come into contact with the existing pipe.

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