Branch pipe forming device, valve core dual-purpose cover, branch pipe forming device including valve core dual-purpose cover, and branch pipe forming method

Abstract

Provided are a branch pipe forming device with high operating efficiency, a valve core double-purpose cover, a branch pipe forming device including the valve core double-purpose cover, and a branch pipe forming method. A branch pipe forming device (100) is installed on an existing pipe (W) in order to form a branch pipe (2) connected to a perforation opening (Wa) formed by perforating a portion of the outer peripheral surface of the existing pipe (W) by a puncher without interrupting flow, and includes a first dividing component (3) and a second dividing component (4), wherein the first dividing component (3) and the second dividing component (4) have dividing surfaces (3a, 4a) along a plane including an axis (X) of the existing pipe (W) and an axis (Y) of the branch pipe (2). ), and are connected to each other in a sealed state by a fastening component (B), the axis core (Z) of the barrel (31) is located in the cutter accommodating space Sp at a position closer to the branch pipe (2) than the outer peripheral surface of the existing pipe (W), and a connecting opening (33, 43) is formed at the connecting portion between the first split component (3) and the second split component (4) and is opposite to the perforation (Wa) via the cutter accommodating space (Sp), and the connecting opening (33, 43) clamps the end (2A) of the branch pipe (2) in a sealed state.

Description

Technical Field

[0001] The present invention relates to a branch pipe forming device and a branch pipe forming method. The branch pipe forming device is installed on an existing pipe in order to form a branch pipe connected to a perforated port without interrupting flow. The perforated port is formed by perforating a part of the outer peripheral surface of the existing pipe with a puncher. Background Art

[0002] The branch pipe forming device is used, for example, when updating an existing water pipe (existing pipe) that has aged to a newly installed water pipe in an uninterrupted flow state. The branch pipe forming method is as follows. The branch pipe forming device is arranged in a watertight state on the periphery of the existing water pipe, and a connecting pipe formed integrally with the branch pipe forming device is connected to the branch pipe. Then, a cutter of a punch is inserted into the cutter accommodating space provided in the branch pipe forming device, and a part of the outer peripheral surface of the existing water pipe is perforated (half-cut) to form a perforated opening, which is connected to the branch pipe, thereby enabling the flow path to be switched. Then, if the existing pipe between the two branch pipe forming devices provided in the existing water pipe is removed, the aged section of the existing water pipe is updated to a branch pipe (newly installed water pipe).

[0003] In the branch pipe forming device described in Patent Document 1 (the connection housing in the document), the two parts divided in a direction perpendicular to the plane containing the axis core of the installed pipe and the axis core of the branch pipe are joined by welding, and the connection pipe (the barrel part in the document) formed integrally with the connection housing is fixed to the two flanges of the branch pipe by bolts and nuts. A valve device (the barrel housing in the document) is connected to the flange on the connection housing, and an operating housing (the barrel housing with a bottom in the document) is connected to the flange on the valve device. The operating housing is used as a housing of a puncher or a cover insertion device for closing the connection housing after punching. In addition, in the cutter accommodating space of the connection housing, a cylindrical guide cylinder (the holding member in the document) into which the center drill of the puncher is inserted and guided is fixed by bolts screwed into the bottom wall of the connection housing from below.

[0004] Patent Document 2 discloses a valve device that also functions as a conventional cap insertion tool.

[0005] The valve device described in Patent Document 2 includes a valve core cover, which functions as a valve core that blocks the flow path of a pipeline (a branch pipe in the document) and also functions as a closing cover that closes the pipeline. When the valve core cover is fixed as a closing cover, a bolt is inserted from below into a through hole of a flange of the branch pipe, and a nut is inserted from above into an insertion hole of a top plate of a housing body of the valve device, and the bolt and nut are screwed together.

[0006] Patent Document 1: Japanese Patent Application Publication No. 60-201808;

[0007] Patent document 2: Japanese Patent Application Publication No. 2018-123963. Summary of the invention

[0008] Problems to be solved by the invention

[0009] The branch pipe forming device described in Patent Document 1 has a reduced operating efficiency because the split parts are joined by welding. In addition, since bending force and tensile force act on the branch pipe connected to the branch pipe forming device due to earthquakes, water may leak from the flange connection portion between the connecting pipe connecting the housing and the branch pipe and the welded portion of the split parts.

[0010] Furthermore, in the case where the cover of the closed connection housing is installed by the cover inserting tool as in the branch pipe forming device described in Patent Document 1, the work efficiency is reduced. On the other hand, although the valve device described in Patent Document 2 can omit the cover inserting tool, it is necessary to insert the nut from above into the insertion hole of the top plate of the housing body and screw it in while the bolt is inserted into the through hole of the flange of the branch pipe part, and the screwing operation requires labor and time, so there is room for improvement in terms of improving the work efficiency.

[0011] Therefore, a branch pipe forming device, a valve core dual-purpose cover, a branch pipe forming device including the valve core dual-purpose cover, and a branch pipe forming method having high working efficiency are desired.

[0012] Means used to solve problems

[0013] The branch pipe forming device of the present invention is characterized in that: a branch pipe forming device is installed on an existing pipe in order to form a branch pipe connected to a perforated port without flow interruption, the perforated port being formed by perforating a portion of the outer peripheral surface of the existing pipe by a puncher, the branch pipe forming device comprises a first splitting component and a second splitting component, the first splitting component and the second splitting component having a splitting surface along a plane including the axial core of the existing pipe and the axial core of the branch pipe, and being connected to each other by a fastening component in a sealed state, the first splitting component having a barrel having the perforated port The invention relates to an opening through which a cutter of the machine can pass, a cutter accommodating space is formed between the first split component and the second split component, the cutter accommodating space can accommodate the cutter at a position adjacent to the perforated port, the perforated port is formed along a direction perpendicular to the plane, the axis core of the cylinder is located in the cutter accommodating space at a position closer to the branch pipe side than the outer peripheral surface of the installed pipe, and a connecting opening portion is formed at the connecting portion of the first split component and the second split component, which is opposite to the perforated port via the cutter accommodating space, and the connecting opening portion clamps the end of the branch pipe in a sealed state.

[0014] In this structure, the first split component and the second split component constituting the branch pipe forming device are connected in a sealed state along the split surface along the plane containing the axis core of the installed pipe and the axis core of the branch pipe. Therefore, for example, the first split component can be installed on the second split component in a state where the second split component is arranged on the lower side in the vertical direction, the cutter accommodating space inside the second split component can be visually confirmed, and the fastening component can be operated from the upper side to connect the first split component to the second split component. As a result, the operating efficiency when updating the installed pipe can be improved.

[0015] In addition, since the end of the branch pipe is clamped in a sealed state at the connecting opening of the first split component and the second split component, the branch pipe can be flexibly moved slightly even when a bending force or a tensile force is applied to the branch pipe due to an earthquake or the like, and the load applied to the connecting opening can be reduced. Moreover, since a barrel having an opening through which a cutter can pass is formed in the first split component, the dividing surface (connecting surface) of the two split components is along a plane including the axis core of the existing pipe and the axis core of the branch pipe, and therefore, compared with the case where the dividing surface (connecting surface) is perpendicular to the plane, the vibration of the punching machine does not directly act on the dividing surface, and the offset of the axis core of the cutter during the punching operation is small. The axis core of the barrel is located at a position closer to the branch pipe side than the outer peripheral surface of the existing pipe in the cutter accommodating space, so the perforation opening punched by the cutter can be a cross-sectional area less than half of the existing pipe, and the strength of the existing pipe can be maintained. In this way, a branch pipe forming device with high operating efficiency and excellent earthquake resistance can be provided.

[0016] Another characteristic structure is that the cutter having a diameter smaller than the outer diameter of the existing pipe is accommodated in the cutter accommodation space.

[0017] According to this configuration, the cutter accommodation space can be made compact, and thus the branch pipe forming device can be miniaturized.

[0018] Another characteristic structure is the following aspect: it further includes a cylindrical guide tube into which the center drill of the punch is inserted and guided, and the guide tube extends from the second dividing member to the side closer to the opening than the dividing surface.

[0019] As in this configuration, if the guide tube extends to the opening side through which the cutter passes rather than the dividing surface, the center drill can be reliably guided, the deviation of the cutter axis can be eliminated, and the perforation can be formed with high accuracy.

[0020] Other characteristic structures are as follows: it also includes a cylindrical guide tube, in which the center drill of the punching machine is inserted and guided, and the axis of the guide tube is perpendicular to the dividing surface.

[0021] If the axis of the guide tube is perpendicular to the dividing surface as in this configuration, the vibration of the puncher is unlikely to act directly on the dividing surface, and the axis deviation of the cutter during the punching operation is small.

[0022] Other characteristic structures lie in the following aspects: it also includes: a cylindrical guide tube, in which the center drill bit of the punching machine is inserted and guided; and a flat plate component, which is placed on the bottom of the second split component and connected to the guide tube, and the bottom of the second split component is formed with: a accommodating recess, which accommodates the flat plate component; and an engaging recess or an engaging protrusion, which engages with the end of the guide tube in the center of the accommodating recess.

[0023] As in the present structure, if a receiving recess for receiving the flat plate member is provided in the second split member, and a locking recess or a locking protrusion is provided in the center of the receiving recess to engage with the end of the guide tube, the positioning of the guide tube is easy, the offset of the axis of the cutter can be eliminated, and the perforation can be formed with high precision. Moreover, since the end of the guide tube is engaged by the receiving recess provided in the second split member, it is not necessary to screw a bolt from the bottom of the second split member to fix the guide tube, and the operation efficiency is high.

[0024] Another characteristic structure is that the flat plate member is composed of a plurality of divided plates.

[0025] When the flat plate member is formed of a partition plate as in this configuration, the partition plates can be sequentially installed while visually checking the cutter storage space with the second partition member arranged vertically downward, thereby improving work efficiency.

[0026] Another characteristic structure is that an annular convex portion protruding toward the perforated opening is formed on the outer edge of the flat plate member.

[0027] As in this structure, if an annular convex portion protruding toward the perforation opening is provided on the outer edge of the flat member, the inner space of the annular convex portion can accommodate the chips generated when the perforation opening is formed in the existing pipe, thereby preventing the chips from flowing into the existing pipe or the branch pipe. In addition, since the annular convex portion is only provided on the outer edge of the flat member, the manufacturing cost can be reduced.

[0028] Other characteristic structures lie in the following aspects: a protrusion is formed at the end of the guide tube, the protrusion protrudes radially outward and is connected to the flat plate component, and the interior of the protrusion contains: a locking component that can be engaged with an annular recess formed on the outer peripheral surface of the center drill bit; and a force applying component that applies force to the locking component radially inward toward the annular recess.

[0029] As shown in this structure, if a clamping member and a force-applying member are provided inside the protrusion for connecting the flat plate member and the guide tube, the clamping member can be engaged with the center drill, and the guide tube and the flat plate member can be recovered at the same time when the puncher is removed. In addition, since the clamping member and the force-applying member are accommodated inside the protrusion, the axial length of the guide tube can be shortened, so that the branch pipe forming device can be miniaturized.

[0030] Another characteristic structure is that a tapered surface capable of abutting against the top end of the center drill is formed on the engaging member, and the top end of the center drill abuts against the tapered surface, so that the engaging member overcomes the biasing force of the biasing member and moves radially outward.

[0031] If the engaging member is provided with a tapered surface as in this configuration, the guide tube and the plate member can be engaged with the punch simply by inserting the center drill into the guide tube, thereby improving the working efficiency.

[0032] Another characteristic structure is that a bolt is screwed into the guide tube, and the bolt abuts against a lower side in a vertical direction of the outer peripheral surface of the installed pipe.

[0033] As in this configuration, when a bolt abutting against the vertically lower side of the outer peripheral surface of the existing pipe is screwed into the guide tube, the guide tube is stabilized even when subjected to vibration of the punch, and positional displacement of the cutter axis can be reliably prevented.

[0034] The characteristic structure of the branch pipe forming device involved in the present invention lies in the following aspects: a branch pipe forming device is installed on an existing pipe in order to form a branch pipe connected to a perforated port without interrupting flow, the perforated port is formed by perforating a part of the outer peripheral surface of the existing pipe by a puncher, the branch pipe forming device includes a first splitting component and a second splitting component connected to each other by a fastening component in a sealed state, a cutter accommodating space is formed between the first splitting component and the second splitting component, the cutter accommodating space can accommodate the cutter of the puncher at a position adjacent to the perforated port, the cutter has a cylindrical hole saw, the hole saw includes a cutting blade at the top end, a disc-shaped vibration-absorbing component for absorbing vibration is inserted in the hole saw, and an elastic component abutting against the inner peripheral surface of the hole saw is fixed to the outer peripheral end surface of the vibration-damping component.

[0035] As in the present structure, if an elastic member that contacts the inner peripheral surface of the hole saw is fixed to the outer peripheral end surface of the vibration-damping member inserted into the hole saw, the elastic member absorbs the vibration of the hole saw, thereby suppressing the vibration of the hole saw and performing the drilling operation quickly and smoothly. In this way, a branch pipe forming device with high operation efficiency is achieved.

[0036] Another characteristic structure is that the elastic member is divided into a plurality of parts so as not to overlap with the cutting blade when viewed from the rotation axis direction of the hole saw.

[0037] As in this configuration, if the elastic member is divided and arranged at a position that does not overlap with the cutting blade, the vibration-damping member can be inserted into the hole saw without damaging the elastic member.

[0038] Other characteristic structures lie in the following aspects: it also includes: a mounting fixture, which mounts the anti-corrosion component on the perforated port, the mounting fixture having a telescopic mechanism, the telescopic mechanism being able to press the anti-corrosion component against the perforated port from the axial direction of the branch pipe and being able to detach from the anti-corrosion component.

[0039] As in this structure, if the mounting fixture for mounting the anti-corrosion component on the perforated opening has a telescopic mechanism, the anti-corrosion component can be pressed against the perforated opening from the axial direction of the branch pipe by using the connecting opening opposite to the perforated opening, so that the anti-corrosion component can be reliably mounted. In addition, if the mounting fixture is detached from the anti-corrosion component and recovered by using the telescopic mechanism, the mounting fixture will not hinder the flow path of the branch flow path.

[0040] Other characteristic structures lie in the following aspects: the anti-corrosion component includes: an annular anti-corrosion seal, which follows the shape of the perforation; and an expansion component, which uses a conical surface abutting against the inner circumference of the annular anti-corrosion seal to expand the diameter of the annular anti-corrosion seal.

[0041] As in this configuration, if the corrosion-resistant member includes an expansion member for expanding the diameter of the annular corrosion-resistant seal, the annular corrosion-resistant seal can be securely brought into close contact with the piercing opening.

[0042] The branch pipe forming method of the present invention is characterized by the following aspects: a branch pipe forming method using any one of the branch pipe forming devices described above, the branch pipe forming method comprising: a split component configuration step, configuring the first split component and the second split component on the installed pipe; a split component connection step, clamping the end of the branch pipe between the first split component and the second split component, and connecting the first split component and the second split component in a sealed state using a fastening component; a punch installation step, installing the punch on the first split component; a branch flow path closing step, closing the gate valve provided on the branch pipe; and a perforation opening forming step, moving the cutter to the cutter accommodating space, and forming the perforation opening at a position adjacent to the cutter accommodating space. Thus, a branch pipe forming method with high operating efficiency is achieved.

[0043] The branch pipe forming method involved in the present invention is characterized in the following aspects: a branch pipe forming method, forming a branch pipe connected to a perforated port in a non-continuous flow state, the perforated port being formed by perforating a portion of the outer peripheral surface of an existing pipe by a puncher, the branch pipe forming method comprising: a split component configuration step, configuring the first split component and the second split component on the existing pipe in such a manner that the split surface of the first split component and the split surface of the second split component are along a plane containing the axial core of the existing pipe and the axial core of the branch pipe; a split component connection step, clamping the end of the branch pipe at the connection opening of the first split component and the second split component, and connecting the first split component and the second split component in a sealed state using a fastening component; a punch installation step, installing the punch on the first split component; a branch flow path closing step, closing the gate valve provided on the branch pipe; and a perforated port forming step, moving the cutter of the puncher to a cutter accommodating space formed between the first split component and the second split component, and forming the perforated port at a position adjacent to the cutter accommodating space.

[0044] In the present method, the first split component and the second split component constituting the branch pipe forming device are connected in a sealed state along the split surface along the plane including the axis core of the existing pipe and the axis core of the branch pipe. Therefore, for example, the first split component can be installed on the second split component in a state where the second split component is arranged on the lower side in the vertical direction, the cutter accommodating space inside the second split component can be visually confirmed, and the fastening component can be operated from the upper side to connect the first split component to the second split component. As a result, the operating efficiency when updating the existing pipe can be improved.

[0045] In addition, since the end of the branch pipe is clamped in a sealed state at the connection opening of the first split component and the second split component, the branch pipe can be flexibly moved slightly even when a bending force or a tensile force acts on the branch pipe due to an earthquake, etc., and the load applied to the connection opening can be reduced. Moreover, since a gate valve is provided on the branch pipe clamped at the connection opening, a perforation is formed after the gate valve is closed to close the branch flow path, so that a plurality of perforations can be independently provided on the existing pipe, and the operation efficiency is high. In this way, a method for forming a branch pipe with high operation efficiency and excellent earthquake resistance can be provided.

[0046] The valve core and cover involved in the present invention is characterized in that: a valve core and cover, which functions as a valve core for blocking the flow path of a pipeline, and also functions as a closing cover for closing the pipeline, the valve core and cover comprising: a bottom wall; and a side wall, which is upright from the outer edge of the bottom wall, and at least one of the bottom wall and the side wall is formed with a locking portion that can be engaged with a valve operating component, and a threaded hole is formed in the side wall, and the threaded hole is for screwing an abutment bolt that abuts against the outer peripheral surface of the end of the pipeline.

[0047] In this structure, at least one of the bottom wall and the side wall is formed with an engaging portion that can engage with the valve operating member. Therefore, by moving the operating member to move the valve core and the valve core cover from the outside, the flow path of the pipeline can be cut off, and the operation efficiency is high.

[0048] In addition, a threaded hole for abutting bolts that abut against the outer peripheral surface of the end of the pipeline is formed on the side wall of the present structure. Therefore, when the valve core dual-purpose cover as a closing cover is fixed to the pipeline, it is only necessary to operate the abutting bolts from the outside to screw them into the threaded holes, so the operation efficiency is extremely high. In this way, a valve core dual-purpose cover with high operation efficiency can be provided.

[0049] Another characteristic structure is that the side wall is provided on a part of the outer edge of the bottom wall, and the valve core cover further includes a side wall member installed on the outer edge of the bottom wall where the side wall does not exist.

[0050] As in this structure, if a portion without a side wall is provided, the portion without a side wall can be passed through the end of the pipeline, so that the valve core and the valve cover as the valve core can be slid by the moving operation member. On the other hand, if a side wall member is provided to be installed in the outer edge portion of the bottom wall where the side wall is not provided, the fixed posture of the valve core and the valve cover as the closing cover is stable.

[0051] Another characteristic structure is the following aspect: a through hole is formed in the bottom wall, and a fixing bolt for fixing the side wall member is inserted into the through hole.

[0052] As in this structure, if the fixing bolt is inserted into the through hole of the bottom wall to fix the side wall member, the valve core and the cover serving as the closing cover can be firmly fixed to the pipeline. Moreover, if a through hole is provided in the bottom wall, the fixing bolt can be operated from above, which can improve the working efficiency.

[0053] The characteristic structure of the branch pipe forming device involved in the present invention lies in the following aspects: a branch pipe forming device, including the above-mentioned valve core and cover, the branch pipe forming device is installed on an existing pipe in order to form a branch pipe connected to a perforated port in a non-stop flow state, the perforated port is formed by perforating a part of the outer peripheral surface of the existing pipe by a puncher, the branch pipe forming device includes a first split component and a second split component connected to each other by a fastening component in a sealed state, the second split component is located at a position lower than the first split component in the vertical direction, the first split component has a barrel, the barrel has an opening through which the cutter of the puncher can pass, an annular recess is formed on the outer peripheral surface of the barrel, and the top end of the abutment bolt abuts against the annular recess.

[0054] In this structure, the first split component can be installed on the second split component in a state where the second split component is arranged on the lower side in the vertical direction, and the first split component can be connected to the second split component by operating the fastening component from the upper side. As a result, the operating efficiency when updating the installed pipe can be improved. In addition, if an annular recessed portion is formed in which the top end of the abutment bolt abuts against the barrel of the first split component, the top end of the abutment bolt abuts against the annular recessed portion firmly, thereby stabilizing the fixed posture of the valve core and cover as a closing cover.

[0055] Other characteristic structures lie in the following aspects: it also includes: an accessory, on which a valve box that accommodates the valve core and serves as a cover is installed, and surrounds the outer circumferential surface of the cylinder, a columnar portion is formed on the first split component, and the columnar portion has a seat surface for carrying the accessory, and the accessory is fixed to the first split component by bolts screwed into the columnar portion.

[0056] If the accessory of this structure is provided, the posture of the valve box can be stabilized, so the valve core and the valve cover as the valve core can be moved smoothly. In addition, the accessory is fixed only by screwing the bolts into the columnar part provided on the first split component, so the operation efficiency is extremely high.

[0057] Other characteristic structures are as follows: the valve box includes: a valve box body; the valve operating member connected to the valve box body; and a closing plate connected to the valve box body in a detachable manner at a position further outward than the valve operating member.

[0058] If the closing plate is detachably connected to the valve body as in this configuration, even if the valve body and the cover have a malfunction, they can be quickly replaced.

[0059] The branch pipe forming method using the above-mentioned branch pipe forming device is characterized in that it includes: a split component configuration step, in which the first split component and the second split component are configured on the existing pipe in such a manner that the split surface of the first split component and the split surface of the second split component are along a plane containing the axis core of the existing pipe and the axis core of the branch pipe; a split component connection step, in which the end of the branch pipe is clamped at the connection opening of the first split component and the second split component, and the first split component and the second split component are connected in a sealed state by a fastening component; a sealing test step, in which the valve core and the second split component are fixed to the first by the abutment bolt. A partition component, supplying fluid to the interior of the first partition component and the second partition component to perform a sealing test; a valve box installation process, after discharging the fluid in the sealing test process, removing the abutment bolt and installing the valve box; a punch installation process, installing the punch on the first partition component; a branch flow path closing process, closing the gate valve provided on the branch pipe; a perforation opening forming process, after moving the valve core and cover to form the opening, moving the cutter to the cutter accommodating space formed between the first partition component and the second partition component, and forming the perforation opening at a position adjacent to the cutter accommodating space.

[0060] In the present method, the first split component and the second split component constituting the branch pipe forming device are connected in a sealed state along the split surface along the plane containing the axis core of the existing pipe and the axis core of the branch pipe. Therefore, for example, the first split component can be installed on the second split component in a state where the second split component is arranged on the lower side in the vertical direction, the cutter accommodating space inside the second split component can be visually confirmed, and the fastening component can be operated from the upper side to connect the first split component to the second split component. As a result, the operating efficiency when updating the existing pipe can be improved.

[0061] In addition, after the valve core dual-purpose cover is fixed to the first split member by the abutment bolts and the sealing test is performed, the abutment bolts are removed and the valve box is installed, so the valve core dual-purpose cover can also be used for the sealing test. Moreover, since the cutter of the punching machine is moved through the opening formed by moving the valve core dual-purpose cover to form the perforation opening, the operation efficiency is high. In this way, a branch pipe forming method with high operation efficiency can be provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] Figure 1 It is an overall stereoscopic view of the branch pipe forming device.

[0063] Figure 2 This is a cross-sectional perspective view of the branch pipe forming device cut along the vertical direction.

[0064] Figure 3 It is a top view showing a state where the branch pipe forming device is installed on the water pipe.

[0065] Figure 4 2 is a diagram showing a first dividing component.

[0066] Figure 5 2 is a diagram showing a second dividing component.

[0067] Figure 6 It is an exploded perspective view showing the split component arrangement step.

[0068] Figure 7 It is a perspective view showing the split component connecting step.

[0069] Figure 8 It is a cross-sectional view of a branch pipe forming device with accessories installed.

[0070] Fig. 9 It is a perspective view showing the accessory installation process.

[0071] Fig.10 This is a cross-sectional perspective view obtained by cutting the branch pipe forming device in the vertical direction, showing the punching process.

[0072] Fig.11 It is an enlarged cross-sectional view showing the punching process.

[0073] Fig.12 It is a cross-sectional view showing the punching process.

[0074] Fig.13 It is a top view showing the valve closing process.

[0075] Fig.14 It is a side view showing the valve closing process.

[0076] Fig.15 It is a cross-sectional view showing the valve closing process.

[0077] Fig.16 It is a perspective view showing the cover fixing process.

[0078] Fig.17 This is a sectional perspective view of the branch pipe forming device cut along the vertical direction after the operating equipment is removed.

[0079] Fig.18 It is a perspective view showing a side wall member fixing process.

[0080] Fig.19 It is an enlarged cross-sectional view showing a fixed state of the cover.

[0081] Fig. 20 It is a top view showing a state where the branch pipe forming device is installed on the water pipe.

[0082] Fig.21 It is a top view showing a state where the branch pipe forming device is installed on the water pipe.

[0083] Fig. 22 It is a side view of the branch pipe forming device involved in other embodiment 1.

[0084] Fig.23 This is a cross-sectional view showing a boring step using the branch pipe forming device according to another second embodiment.

[0085] Fig.24 This is a cross-sectional view showing a valve closing step using the valve cover according to another third embodiment.

[0086] Fig.25 This is a cross-sectional view showing a state where a branch pipe is mounted on the branch pipe forming device according to another fourth embodiment.

[0087] Fig.26 This is a plan view of the second split member showing a state in which a branch pipe is attached to the branch pipe forming device according to another fourth embodiment.

[0088] Fig. 27 This is a cross-sectional view showing a state where a branch pipe is mounted on the branch pipe forming device according to another fifth embodiment.

[0089] Fig.28 This is a cross-sectional view showing a state where a punch is installed on the branch pipe forming device involved in another sixth embodiment.

[0090] Fig.29 This is a cross-sectional view showing a punching step according to another sixth embodiment.

[0091] Fig.30 It is a perspective view showing a cutter and a vibration damping member according to another sixth embodiment.

[0092] Fig.31 This is a cross-sectional view showing the state before the anti-corrosion component is installed at the perforation port using the branch pipe forming device involved in other embodiment 7.

[0093] Fig.32 This is a cross-sectional view showing a state where an anti-corrosion component is installed at a perforated port using a branch pipe forming device according to another seventh embodiment.

[0094] Fig.33 This is a cross-sectional view showing the state after the anti-corrosion component is installed at the perforation port using the branch pipe forming device involved in other embodiment 7.

[0095] Fig.34 This is an exploded perspective view showing an anti-corrosion component according to another seventh embodiment.

[0096] Fig.35 This is a diagram showing an annular anti-corrosion seal according to another seventh embodiment.

[0097] Fig.36 This is a cross-sectional view showing a sealing test process according to another eighth embodiment.

[0098] Fig.37 This is a cross-sectional view showing a valve box mounting step according to another eighth embodiment.

[0099] Fig.38 This is an enlarged perspective view showing a valve operating member according to another eighth embodiment.

[0100] Fig.39 This is a cross-sectional view showing a cap replacement process according to another ninth embodiment. DETAILED DESCRIPTION

[0101] Hereinafter, embodiments of the branch pipe forming device, the valve core dual-purpose cover, the branch pipe forming device including the valve core dual-purpose cover, and the branch pipe forming method according to the present invention will be described based on the accompanying drawings. In this embodiment, as an example of the branch pipe forming device and the branch pipe forming method, a branch pipe forming device 100 installed on the water pipe W (an example of an existing pipe) constituting a fluid piping system during renewal and earthquake-resistant construction, and a branch pipe forming method using the branch pipe forming device 100 will be described. However, the present invention is not limited to the following embodiments, and various modifications can be made without departing from the main purpose thereof.

[0102] like Figure 1 as well as Figure 2As shown, the branch pipe forming device 100 is composed of a split T-shaped pipe of a split structure, and the split T-shaped pipe of the split structure is installed on the water pipe W in order to form a branch pipe 2 connected to a perforated port Wa in a non-stop flow state, and the perforated port Wa is formed by perforating a part of the outer peripheral surface of the water pipe W (an example of an existing pipe) by a puncher 1. The branch pipe forming device 100 includes: a first split component 3 and a second split component 4, which have split surfaces 3a and 4a along a plane including the axis X of the water pipe W and the axis Y of the branch pipe 2, and are connected to each other by a fastening component B in a sealed state; and a cover body 5 (an example of a valve core and a cover) that closes the opening 31a (end) of the cylinder 31 (an example of a pipeline) of the first split component 3. Here, "dividing surfaces 3a, 4a along the plane including the axis X of the water pipe W and the axis Y of the branch pipe 2" means that the dividing surfaces 3a, 4a are present on the plane including the axis X of the water pipe W and the axis Y of the branch pipe 2 or on a plane substantially parallel to the plane. The water pipe W, the branch pipe 2, and the branch pipe forming device 100 in this embodiment are formed using the same material composed of a cast iron pipe, a steel pipe, or the like. In addition, the water pipe W and the branch pipe 2 or the branch pipe forming device 100 may be formed using different materials.

[0103] The branch pipe forming device 100 in this embodiment is installed along the outer peripheral surface of the water pipe W in such a manner that the first dividing member 3 is arranged on the upper side in the vertical direction and the second dividing member 4 is arranged on the lower side in the vertical direction, and the first dividing surface 3a of the first dividing member 3 and the second dividing surface 4a of the second dividing member 4 are along a horizontal plane parallel to the ground. In the following, the gravity direction is sometimes described as downward and the opposite direction thereof is described as upward.

[0104] like Figure 2 and Figure 3 As shown, the end flange 2A of the branch pipe 2 is clamped by the connection openings 33 and 43 of the first split component 3 and the second split component 4. The short pipe 21 of the branch pipe 2 in this embodiment and the two flanges 21a and 22a of the connection pipe 22 having the gate valve V are connected by bolts 23 and nuts 24. The flange 22b on the opposite side of the flange 22a of the connection pipe 22 is connected to another connection pipe.

[0105] like Figure 4 and Figure 6 As shown, the first split component 3 is composed of a split component, comprising: a semi-cylindrical first main body portion 32 along the outer circumferential surface of the water pipe W; a semi-cylindrical first connecting opening portion 33 extending from the first main body portion 32 to the branch pipe 2 side and along the outer circumferential surface of the branch pipe 2; and a cylindrical barrel portion 31 extending upward across the first main body portion 32 and the first connecting opening portion 33.

[0106] The first main body 32 includes a first curved portion 32a curved along the outer peripheral surface of the water pipe W and a first flange portion 32b formed to protrude from the first curved portion 32a to the side of the water pipe W. A pair of through-hole portions 32a1 are formed in the first curved portion 32a on a diagonal line intersecting the axis X of the water pipe W in a plan view, and position fixing bolts 38 are inserted into the pair of through-hole portions 32a1 with their top ends abutting against the outer peripheral surface of the water pipe W and screwed with nuts 39 received in a rotationally fixed state on the inner surface of the first main body 32 (see also FIG. 1 ). Figure 6 ). The first split member 3 is fixed to the water pipe W in a non-rotatable manner by the position fixing bolt 38 abutting against the outer peripheral surface of the water pipe W. In addition, a bolt Ba constituting a fastening member B is inserted into the first flange portion 32b, and a plurality of (four in this embodiment) first through-hole portions 32b1 are formed along the axis X (see also Figure 1 ), a nut Bb for threading the bolt Ba is arranged in the first through hole portion 32b1.

[0107] The first connection opening 33 includes a first branch curved portion 33a curved along the outer peripheral surface of the end flange 2A of the branch pipe 2 and a pair of first branch flange portions 33b protruding from the first branch curved portion 33a along the axis X of the water pipe W. Bolts Ba constituting the fastening member B are inserted into the pair of first branch flange portions 33b, and a plurality of first through-hole portions 33b1 (see also the embodiment) are formed (two in each first branch flange portion 33b). Figure 1 ), a nut Bb for threading the bolt Ba is arranged in the first through hole portion 33b1.

[0108] A first dividing surface 3a having a rectangular shape in plan view is formed on the outer edge of the first flange portion 32b of the first main body portion 32 and the inner surface of the first connecting opening portion 33. A first sealing groove 3a1 having a rectangular shape in plan view and in which the first sealing member S1 is fitted is formed throughout the first dividing surface 3a and the inner surface of the first curved portion 32a. The first dividing member 3 is sealed relative to the water pipe W and the branch pipe 2 by the first sealing member S1 being in close contact with the outer peripheral surface of the water pipe W and the outer peripheral surface of the end flange 2A of the branch pipe 2.

[0109] The barrel 31 has an opening 31a having an opening through which the hole saw 11 (an example of a cutter) of the punch 1 can pass, and a base end 31b connected to the first main body 32 and the first connecting opening 33. The axis Z of the barrel 31 coincides with the rotation axis of the hole saw 11, and is located closer to the branch pipe 2 than the axis X of the water pipe W and does not overlap with the water pipe W when viewed from above (see also FIG. Figure 8 and Fig.12). In other words, the axis Z of the cylinder 31 is located closer to the branch pipe 2 than the outer peripheral surface of the water pipe W. As a result, the hole Wa punched by the hole saw 11 becomes a cross-sectional area less than half of the water pipe W, which can maintain the strength of the water pipe W. An annular recessed portion 31a1 (an example of the outer peripheral surface of the end portion) is formed in the opening 31a with which the top end of the abutment bolt T described later abuts (see also Figure 2 ). A plurality of columnar portions 31c (in this embodiment, four portions arranged at equal intervals in the circumferential direction) are formed protruding radially outward at the base end portion 31b, and the plurality of columnar portions 31c have holes 31c1 for screwing and fixing embedded bolts U of the accessory 7 described later. The top surfaces of the plurality of columnar portions 31c constitute seat surfaces 31c2 for placing the accessory 7, and the seat surfaces 31c2 are arranged on the same plane in order to maintain the posture of the accessory 7 in a horizontal state.

[0110] like Figure 5 and Figure 6 As shown, the second split component 4 has: a semi-cylindrical second main body portion 42, which is composed of split components and is along the outer peripheral surface of the water pipe W; a semi-cylindrical second connecting opening portion 43, which extends from the second main body portion 42 to the branch pipe 2 side and along the outer peripheral surface of the branch pipe 2; and a bottom portion 41, which spans the second main body portion 42 and the second connecting opening portion 43 and is observed from the inner surface side, and is recessed on the lower side into a circular shape when viewed from above.

[0111] The second main body 42 has a second curved portion 42a curved along the outer peripheral surface of the water pipe W and a second flange portion 42b formed to protrude from the second curved portion 42a to the side of the water pipe W. In the second curved portion 42a, a pair of through-hole portions 42a1 are formed on a diagonal line intersecting the axis X of the water pipe W when viewed from above. In the pair of through-hole portions 42a1, position fixing bolts 38 whose top ends abut against the outer peripheral surface of the water pipe W are inserted, as in the first split member 3, and are screwed with nuts 39 received in the inner surface of the second main body 42 in a non-rotating state. The position fixing bolts 38 abut against the outer peripheral surface of the water pipe W, so that the second split member 4 is fixed to the water pipe W in a non-rotating manner. In addition, in the second flange portion 42b, a plurality of (four in this embodiment) second through-hole portions 42b1 are formed along the axis X, into which bolts Ba constituting the fastening member B are inserted.

[0112] The second connection opening 43 includes a second branch curved portion 43a curved along the outer peripheral surface of the end flange 2A of the branch pipe 2, and a pair of second branch flange portions 43b protruding from the second branch curved portion 43a along the axis X of the water pipe W. The pair of second branch flange portions 43b are formed with a plurality of (two in each second branch flange portion 43b in this embodiment) second through-hole portions 43b1 into which bolts Ba constituting the fastening member B are inserted.

[0113] A second dividing surface 4a that is rectangular when viewed from above is formed on the outer edge of the inner surface of the second flange portion 42b of these second main body portions 42 and the second connecting opening portion 43. A second sealing groove 4a1 that is rectangular when viewed from above is formed throughout the second dividing surface 4a and the inner surface of the second curved portion 42a, into which the second sealing component S2 is fitted. The second sealing component S2 is tightly attached to the outer peripheral surface of the water pipe W and the outer peripheral surface of the end flange 2A of the branch pipe 2, thereby the second dividing component 4 is sealed relative to the water pipe W and the branch pipe 2. In addition, the first sealing component S1 fitted in the first sealing groove 3a1 of the first dividing surface 3a and the second sealing component S2 fitted in the second sealing groove 4a1 of the second dividing surface 4a are pressed against each other, thereby sealing the gap between the first dividing component 3 and the second dividing component 4.

[0114] The bottom 41 has: a circular accommodating recess 41a in a plan view for accommodating a flat plate member 9 described later; and a circular engaging recess 41b in a plan view for engaging with an end of a guide tube 8 described later at the center of the accommodating recess 41a (see also Figure 8 The accommodating recessed portion 41a is formed by recessing the bottom portion 41 downward, and the engaging recessed portion 41b is formed by recessing the center of the accommodating recessed portion 41a further downward.

[0115] In addition, the accommodating recess 41a is provided with an annular convex portion 41c protruding upwardly in a plan view and having an annular shape on the outer peripheral side adjacent to the engaging recess 41b. The upper surface of the annular convex portion 41c serves as a mounting surface 41c1 (also see FIG. 4 ) on which the protruding portion 82 of the guide tube 8 described later is mounted. Fig.11 ). The mounting surface 41c1 is a plane parallel to a plane including the axis X of the water pipe W and the axis Y of the branch pipe 2. According to such a structure, an annular groove 41d is formed on the outer peripheral side of the annular convex portion 41c, and the flat plate member 9 is mounted in the annular groove 41d.

[0116] like Figure 1 and Figure 2 As shown in the figure, the cover body 5 that closes the opening 31a of the cylinder 31 of the first split member 3 has a bottom wall 51 and a side wall 52 that stands upright from the outer edge of the bottom wall 51. The cover body 5 functions as a valve core that blocks the flow path of the cylinder 31 as a pipeline, and also functions as a closing cover that closes the cylinder 31. Hereinafter, the valve box 6 that accommodates the cover body 5 is sometimes collectively referred to as a "valve core and cover".

[0117] The bottom wall 51 is a flat plate member that is circular in plan view, and has an arc-shaped long groove 51a (an example of an engaging portion) formed on its outer surface that can engage with the valve operating member Vk (see also Figure 13-14). The end of the valve operating member Vk rotates from one end of the long groove 51a to the other end, thereby the cover body 5 slides inside the valve box 6. As a result, it is possible to switch between a closed valve state in which the cover body 5 closes the opening of the barrel 31 and an open valve state in which the cover body 5 leaves the opening of the barrel 31. In addition, a plurality of (two in this embodiment) through holes 51b are formed at the portion on the opposite side of the long groove 51a in the outer edge of the bottom wall 51 for inserting fixing bolts K for fixing the side wall member 53 described later. In addition, an annular sealing groove 51c is formed on the inner surface of the outer edge of the bottom wall 51 for the annular sealing member S3 to be engaged, and the annular sealing member S3 is tightly attached to the upper surface of the opening 31a of the barrel 31, thereby the cover body 5 seals the barrel 31 of the first split component 3. In addition, the bottom wall 51 is not limited to a circular shape when viewed from above, and can also be configured to be rectangular when viewed from above.

[0118] The side wall 52 is provided at a portion of the outer edge of the bottom wall 51 and is composed of a protruding portion that protrudes integrally over a region greater than a semicircle (greater than 180 degrees) of the bottom wall 51. A side wall member 53 is attached to the outer edge of the bottom wall 51 where the side wall 52 does not exist.

[0119] On the side wall 52, a plurality of (four in this embodiment) threaded holes 52a for screwing abutment bolts T that abut against the annular recessed portion 31a1 formed on the outer peripheral surface of the opening portion 31a of the cylinder 31 are provided at two locations respectively along the axial core X of the water pipe W. In this embodiment, the abutment bolts T are formed of hexagon socket bolts, and the cover body 5 is fixed to the cylinder 31 of the first split member 3 by screwing the abutment bolts T into the threaded holes 52a so that the top ends of the abutment bolts T bite into the annular recessed portion 31a1 (see also FIG. 1 ). Fig.19 ). In addition, the annular recessed portion 31 a 1 may not be formed on the outer peripheral surface of the opening portion 31 a of the cylinder portion 31 , and the contact bolt T may be contacted with the smooth outer peripheral surface of the opening portion 31 a of the cylinder portion 31 .

[0120] The side wall member 53 is formed of an arc-shaped member and is inserted into the outer edge of the bottom wall 51 where the side wall 52 is not present. The side wall member 53 is formed with: a first threaded hole 53a that penetrates in the horizontal direction along the axis X of the water pipe W and is screwed with the abutment bolt T; and a plurality of (two in this embodiment) second threaded holes 53b that penetrate in the direction perpendicular to the axis X of the water pipe W and the axis Y of the branch pipe 2 and are screwed with the fixing bolts K (see also Fig.18 The side wall member 53 inserted into the outer edge portion of the bottom wall 51 where the side wall 52 is not present is integrated with the cover body 5 by inserting the fixing bolt K from the through hole 51b of the bottom wall 51 and screwing it into the second threaded hole 53b, and is fixed to the cylinder portion 31 of the first split component 3 by screwing the abutment bolt T into the first threaded hole 53a so that the top end of the abutment bolt T bites into the annular recess 31a1 (see also Fig.19 ). In addition, the first threaded hole 53a with which the contact bolt T is screwed may be omitted.

[0121] Next, the working equipment used in the branch pipe forming method using the branch pipe forming device 100 is described. Fig.12 As shown, the apparatus comprises: a puncher 1; a valve box 6 accommodating a cover body 5 functioning as a valve core for blocking a flow path of a cylinder 31; an accessory 7 for stably fixing the valve box 6; a guide tube 8 for guiding a center drill 12 of the puncher 1; and a flat member 9 connected to the guide tube 8. Hereinafter, the apparatus may be referred to as a branch pipe forming device 100 including any one of the puncher 1, the valve box 6, the accessory 7, the guide tube 8, and the flat member 9.

[0122] like Fig.11 as well as Fig.12 As shown, the drilling machine 1 includes: a cylindrical hole saw 11 (an example of a cutter) having a cutting blade 11a; a center drill 12 protruding outward from the center position of the hole saw 11 relative to the cutting blade 11a; a rotation drive mechanism 13 including a motor for rotationally driving the hole saw 11 and the center drill 12; and a drilling housing 14 for accommodating the hole saw 11 and the center drill 12. Alternatively, a structure may be provided in which only the hole saw 11 is rotated by the rotation drive mechanism 13 without rotating the center drill 12.

[0123] The hole saw 11 in this embodiment is configured to have an outer diameter smaller than the outer diameter of the water pipe W, and cuts a portion of the outer peripheral surface of the water pipe W. The hole saw 11 and the center drill 12 are connected to the rotating shaft 13a of the rotating drive mechanism 13, and move forward and backward in a direction perpendicular to the plane including the axis X of the water pipe W and the axis Y of the branch pipe 2 while rotating (up and down direction). When the hole saw 11 is rotated toward the water pipe W and moved downward by the rotating drive mechanism 13, a portion of the outer peripheral surface (side surface) of the water pipe W is cut by the cutting blade 11a of the hole saw 11, and a perforation Wa is formed along the perpendicular direction (see also FIG. 1 ). Figure 2 The perforation opening Wa in a direction perpendicular to the plane including the axis X of the water pipe W and the axis Y of the branch pipe 2 is formed in a shape consistent with the outer shape of the hole saw 11, and is formed in a semicircular arc shape along the axis X of the water pipe W when viewed from above. In addition, the outer diameter of the hole saw 11 can also be configured to be greater than or equal to the outer diameter of the water pipe W.

[0124] When the hole saw 11 and the center drill 12 are moved forward by the rotary drive mechanism 13, a cutter accommodation space Sp capable of accommodating the hole saw 11 at a position adjacent to the punching port Wa is formed between the first split component 3 and the second split component 4. According to this structure, a connection opening 33, 43 is formed at the connection portion of the first split component 3 and the second split component 4, which is opposite to the punching port Wa via the cutter accommodation space Sp, and the connection opening 33, 43 clamps the end flange 2A of the branch pipe 2 in a sealed state. In the center drill 12 of the present embodiment, the corner of the entire circumferential area of ​​the top end surface of the top end portion 12a is formed in a tapered shape, and an annular recess 12a1 is formed on the side surface of the top end portion 12a.

[0125] like Figure 12 to Figure 14 As shown, the valve box 6 includes: a valve box body 61 for accommodating the cover body 5; and a valve box cylinder 62, which extends from the valve box body 61 in a cylindrical shape and can allow the hole saw 11 and the center drill 12 to pass through. The valve box body 61 includes a cover accommodating portion 61A for accommodating the cover body 5 in the valve open state and a valve box fixing portion 61B for accommodating the cover body 5 in the valve closed state and fixed to the fitting 7. At the end of the valve box cylinder 62, a valve box flange 62a is formed in a protruding annular shape and is fixed to the punching flange 14a of the punching housing 14 of the punching machine 1 by bolts and nuts.

[0126] The cover accommodating portion 61A is a rectangular box in a plan view, and a valve operating member Vk is fixed to the upper wall in a sealed state. The valve operating member Vk rotates the operating rod Vk1 so that the end of the valve operating member Vk rotates from one end of the long groove 51a to the other end, so that the cover body 5 slides inside the valve box 6.

[0127] The valve box fixing portion 61B includes: a valve box cylindrical portion 63 which is circular in plan view and forms a moving space for the cover body 5 together with the cover accommodating portion 61A; and a valve box extending portion 64 which extends from the valve box cylindrical portion 63 along the outer peripheral surface of the fitting 7. The valve box cylindrical portion 63 is provided with a plurality of (four in this embodiment) operation through holes 63a for inserting an operating tool (not shown) for threading an abutment bolt T which is composed of a hexagon socket head bolt for fixing the cover body 5 to the cylinder portion 31 of the first split member 3. The closing bolt 63a1 which is closed in a watertight state except when the operating tool is inserted is threaded into the operation through hole 63a. In addition, a plurality of (two in this embodiment) press bolt through holes 63b are provided in the upper wall of the valve box cylindrical portion 63 to which a press bolt P which presses the outer edge of the cover body 5 on the opening portion 31a of the closed cylinder portion 31 is threaded. The valve box extension 64 is provided with a plurality of (four in this embodiment) valve fixing through holes 64a for screwing with valve box fixing bolts 65 that abut against the lower portion of the fitting 7. In addition, an annular protrusion 64b is formed on the inner circumferential surface of the valve box extension 64 in a circular ring shape at the boundary portion with the valve box cylindrical portion 63, and the fitting 7 is clamped by the annular protrusion 64b and the valve box fixing bolts 65, so that the valve box 6 is fixed to the fitting 7.

[0128] like Figure 8-Figure 9 As shown, the accessory 7 is composed of an annular member surrounding the outer peripheral surface of the cylinder 31 of the first split component 3. The accessory 7 in this embodiment is a split structure composed of a pair of semicircular members, and each semicircular member is provided with a plurality of fixing through holes 71 (two in each semicircular member in this embodiment) in the up and down directions for inserting embedded bolts U for fixing the accessory 7 to the first split component 3. The embedded bolts U are inserted into the fixing through holes 71 and screwed into the hole 31c1 of the columnar portion 31c of the first split component 3, so that the accessory 7 is fixed to the first split component 3. The head of the embedded bolt U in this embodiment is provided with an annular sealing groove Ua, and an O-ring Ub is installed in the sealing groove Ua. In addition, an annular tapered surface 72 is formed on the upper and lower outer edges of the outer peripheral surface of the accessory 7. The top end of the valve box fixing bolt 65 abuts against the lower annular tapered surface 72, and the annular protrusion 64b of the valve box 6 and the valve box fixing bolt 65 sandwich the fitting 7, and the valve box 6 is fixed to the fitting 7 (see also Fig.12 ). In addition, the accessory 7 is not limited to a circular ring-shaped member, and may be configured to have a polygonal outer shape when viewed from above, for example.

[0129] like Figures 10 to 12As shown, the guide tube 8 is inserted into the center drill 12 of the drilling machine 1 and guides the center drill 12 to move forward and backward in the vertical direction. The guide tube 8 has a cylindrical peripheral wall portion 81 having an inner diameter substantially the same as the outer diameter of the center drill 12; and an annular protrusion 82 protruding radially outward from the end of the peripheral wall portion 81 and connected to the flat plate member 9. The end of the peripheral wall portion 81 engages with the engaging recess 41b formed in the bottom 41 of the second split member 4, thereby positioning the guide tube 8. The upper end of the peripheral wall portion 81 of the guide tube 8 protrudes upward from the split surfaces 3a and 4a and is located on the opening 31a side of the barrel 31. In other words, the guide tube 8 extends from the second split member 4 to a position closer to the opening 31a side of the barrel 31 than the split surfaces 3a and 4a. As a result, the center drill 12 is reliably guided, the offset of the cutter axis can be eliminated, and the perforation opening Wa can be formed with high accuracy. In addition, the axis of the peripheral wall portion 81 of the guide tube 8 is consistent with the axis Z of the tube portion 31 and is perpendicular to the dividing surfaces 3a and 4a. As a result, the vibration of the punching machine 1 is unlikely to act directly on the dividing surfaces 3a and 4a, and the axis deviation of the cutter during the punching operation is small. In addition, the guide tube 8 can be of any shape as long as it can guide the forward and backward movement of the center drill 12 in the vertical direction.

[0130] A peripheral wall through hole 81a is formed in the peripheral wall portion 81, which holds the cut portion Wb separated from the water pipe W when the punching hole Wa of the water pipe W is formed. The cut portion Wb is sandwiched between the peripheral wall through hole 81a and the inner peripheral surface of the hole saw 11, and the cut portion Wb is held. In addition, a pair of block portions 83 are formed on both sides of the peripheral wall portion 81 along the axis X of the water pipe W, and the pair of block portions 83 are screwed with the axis core retaining bolt J, and the axis core retaining bolt J abuts against the lower side of the outer peripheral surface of the water pipe W (cut portion Wb) in the vertical direction to prevent the axis core of the punching machine 1 from shifting. The axis core retaining bolt J abuts against the lower side of the outer peripheral surface of the water pipe W (cut portion Wb) in the vertical direction, and therefore has the function of preventing the cut portion Wb from falling. In addition, the form of the axis core retaining member that prevents the axis core of the punching machine 1 from shifting is not particularly limited, such as being composed of an axis core retaining pin instead of the axis core retaining bolt J.

[0131] The protruding portion 82 is formed with a plurality of (four in this embodiment) bolt insertion holes 82a for inserting the outer peripheral fixing bolts G inserted to fix the flat plate member 9, and a holding mechanism 84 for holding the center drill 12 of the punching machine 1 is provided inside the bolt insertion holes 82a. The holding mechanism 84 includes: a storage box 82b formed on the protruding portion 82; a clamping member 84a that can be engaged with the annular recessed portion 12a1 formed on the outer peripheral surface of the center drill 12; and a compression coil spring 84b (an example of a biasing member) that biases the clamping member 84a toward the radial inner side of the annular recessed portion 12a1. Alternatively, the outer peripheral fixing bolts G may be formed by pins, and the protruding portion 82 and the flat plate member 9 may be pin-engaged.

[0132] The storage box 82b is a pair of box-shaped components integrally formed on the upper surface of the protruding portion 82 and having an opening on the radial inner side, and the compression coil spring 84b and the engaging component 84a are inserted and accommodated in sequence from the opening. The engaging component 84a is composed of a rectangular block-shaped component, and a tapered surface 84a1 is formed on the upper surface of the top end to abut against the tapered top corner formed on the top end surface of the top end portion 12a of the center drill 12. When the top end corner of the center drill 12 abuts against the tapered surface 84a1, the engaging component 84a overcomes the applied force of the compression coil spring 84b and moves radially outward, and when the center drill 12 moves forward, the engaging component 84a is engaged with the annular recessed portion 12a1 by the applied force of the compression coil spring 84b, and the center drill 12 is held by the holding mechanism 84.

[0133] The flat plate member 9 is formed in a circular ring shape when viewed from above, and is connected to the guide tube 8 in a state where it is placed in the circular ring groove 41d formed in the accommodating recess 41a of the second split member 4. The flat plate member 9 is provided with a plurality of (four in the present embodiment) peripheral fixing bolt threading holes 91 for threading the peripheral fixing bolts G for fixing the guide tube 8 to the flat plate member 9. In addition, an annular convex portion 92 protruding toward the through hole Wa side is formed at the outer edge of the flat plate member 9. The annular convex portion 92 is composed of an elastic member such as rubber fixed to the upper surface of the flat plate member 9 by bonding or the like, but may also be formed integrally with the flat plate member 9. In addition, the flat plate member 9 is not limited to a circular ring shape when viewed from above, and may be configured to be, for example, rectangular when viewed from above.

[0134] The flat plate member 9 in this embodiment is composed of a single component formed integrally, but is preferably composed of a plurality of (for example, two) divided partition plates. By forming the flat plate member 9 with partition plates, when inserted into the receiving recess 41a of the second partition member 4, after one partition plate is placed in the annular groove 41d in a manner that does not interfere with the water pipe W, the other partition plate can be placed in the annular groove 41d in a manner that does not interfere with the water pipe W by rotating it toward the lower side of the water pipe W. On the other hand, in the case where the flat plate member 9 is formed of a single component, the flat plate member 9 is inserted into the receiving recess 41a of the second partition member 4 in an inclined state.

[0135] Next, use Figure 6 to Figure 19 A branch pipe forming method using the branch pipe forming device 100 is described. In this embodiment, after the branch pipe forming device 100 is installed at a predetermined position of the water pipe W to form a branch pipe 2 connected to the water pipe W, another branch pipe forming device 100 is installed at another position of the water pipe W to form a branch pipe 2 connected to the water pipe W, and the aged water pipe W located between these branch pipe forming devices 100 is removed and the water pipe W is updated to the branch pipe 2 (new water pipe W).

[0136] The branch pipe forming method in this embodiment includes: Figure 6 (1) segmentation component configuration step shown; Figure 7 (2) the split component connection step shown; Figure 8-Figure 9 (3) Accessory installation process shown; Figure 10 to Figure 12 (4) perforation process shown; Figure 13 to Figure 15 (5) Valve closing process shown; Fig.16 (6) cover fixing process shown; Fig.17 (7) Valve box removal process shown; and Figure 18-19 (8) Side wall component installation process shown.

[0137] (1) Segmentation component placement process

[0138] like Figure 6 As shown, the first dividing component 3 and the second dividing component 4 are arranged on the water pipe W in such a manner that the dividing surface 3a of the first dividing component 3 and the dividing surface 4a of the second dividing component 4 are along a plane including the axis X of the water pipe W and the axis Y of the branch pipe 2.

[0139] Specifically, first, the second split component 4 in which the second sealing member S2 is fitted in the second sealing groove 4a1 is arranged on the lower side of the water pipe W, and the end flange 2A of the branch pipe 2 is arranged in the second connection opening 43 of the second split component 4. In addition, when there is a support table capable of maintaining the second split component 4 in a horizontal state, the flat plate member 9 and the guide tube 8 in the split component connection step (2) described later can also be stored in the cutter storage space Sp.

[0140] In a state where the water pipe W and the branch pipe 2 (including the flat plate member 9 and the guide tube 8 if there is a support base for the second split member 4) are arranged on the upper side of the second split member 4, the first split member 3 (see Figure 4 ) approaches from above the second dividing component 4 so that the dividing surface 3a of the first dividing component 3 faces the dividing surface 4a of the second dividing component 4. In this way, since the first dividing component 3 and the second dividing component 4 constituting the branch pipe forming device 100 are composed of the dividing surfaces 3a and 4a along the plane including the axis X of the water pipe W and the axis Y of the branch pipe 2, it is easy to mount the first dividing component 3 on the second dividing component 4 in a state where the second dividing component 4 is arranged on the lower side in the vertical direction.

[0141] (2) Segmented parts connection process

[0142] like Figure 6-7 As shown, in a state where the end flange 2A of the branch pipe 2 is clamped in the connecting openings 33 and 43 of the first split component 3 and the second split component 4, the first split component 3 and the second split component 4 are connected in a sealed state by using a fastening component B. The fastening component B is arranged at four locations on the first flange portion 32b of the first split component 3 and the second flange portion 42b of the second split component 4, and at four locations on the first branch flange portion 33b of the first split component 3 and the second branch flange portion 43b of the second split component 4, for a total of eight locations. By the fastening operation of the fastening component B, the first sealing component S1 engaged in the first sealing groove 3a1 of the first split surface 3a and the second sealing component S2 engaged in the second sealing groove 4a1 of the second split surface 4a are pressed against each other, whereby the gap between the first split component 3 and the second split component 4 is sealed, and becomes sealed relative to the water pipe W and the branch pipe 2 (also refer to Figure 8 Then, the position fixing bolts 38 are inserted into the pair of through-holes 32a1 of the first split member 3 and the pair of through-holes 42a1 of the second split member 4 to fix the positions of the first split member 3 and the second split member 4 to the water pipe W so that they do not rotate.

[0143] Then, if Figure 6As shown, the flat plate member 9 and the guide tube 8 are received in the cutter receiving space Sp via the opening 31a of the cylinder 31 of the first split member 3 or the opening of the branch pipe 2. Specifically, the flat plate member 9 is placed on the annular groove 41d of the receiving recess 41a of the second split member 4, and the flat plate member 9 and the guide tube 8 are connected by the peripheral fixing bolts G (see also Fig.11 Next, the shaft core retaining bolt J inserted into the block portion 83 of the guide tube 8 in advance is tightened so that the tip of the shaft core retaining bolt J abuts against the lower side of the outer peripheral surface of the water pipe W (cut portion Wb) in the vertical direction (see also Fig.12 ). The connection operation performed by the outer peripheral fixing bolts G of the flat plate member 9 and the guide tube 8 and the tightening operation of the shaft core retaining bolts J can be performed from above while facing the cutter accommodating space Sp, and the positioning of the guide tube 8 is easy because only the end of the guide tube 8 needs to be engaged with the engaging recess 41b formed in the center of the accommodating recess 41a. In addition, when the flat plate member 9 is placed, in the case where the flat plate member 9 is composed of a partition plate, when inserted into the accommodating recess 41a of the second partition member 4, after one partition plate is placed in the annular groove 41d in a manner that does not interfere with the water pipe W, by rotating it toward the lower side of the water pipe W, the other partition plate can be placed in the annular groove 41d in a manner that does not interfere with the water pipe W.

[0144] In the present embodiment, the first split component 3 and the second split component 4 constituting the branch pipe forming device 100 are constituted by split surfaces 3a and 4a along the plane including the axis X of the water pipe W and the axis Y of the branch pipe 2, so that the first split component 3 and the second split component 4 can be connected by operating the fastening component B from the upper side, which can improve the working efficiency. That is, the bolt fastening operation at the lower side of the water pipe W and the branch pipe 2 is unnecessary. In addition, since the end flange 2A of the branch pipe 2 is clamped in a sealed state at the connection openings 33 and 43 of the first split component 3 and the second split component 4, even when a bending force or a tensile force acts on the branch pipe 2 due to an earthquake, the first split component 3 and the second split component 4 can bear the load, and the load applied to the fastening component B can be reduced. In addition, even when a bending force or a tensile force acts on the branch pipe 2 due to an earthquake, the branch pipe 2 can be flexibly moved slightly, and the load applied to the connection openings 33 and 43 can be reduced. In particular, since the first split component 3 and the second split component 4 constituting the branch pipe forming device 100 are composed of split surfaces 3a and 4a along a plane including the axis X of the water pipe W and the axis Y of the branch pipe 2, there is no vertical joint and the strength is high with respect to the load (tensile force) in the axis Y direction of the branch pipe 2. As a result, the branch pipe forming device 100 is excellent in earthquake resistance.

[0145] (3) Accessory installation process

[0146] like Figure 8-Figure 9 As shown, the fitting 7 of the two-split structure is placed on the seat surfaces 31c2 of the plurality of columnar portions 31c formed in the cylinder 31 of the first split component 3, respectively, and the embedded bolts U inserted into the fixing through holes 71 of the fitting 7 are screwed into the holes 31c1 of the columnar portions 31c. These seat surfaces 31c2 are arranged on the same plane so as to maintain the posture of the fitting 7 in a horizontal state, so the fixing operation of the fitting 7 relative to the first split component 3 is easy. In addition, since the first split component 3 and the second split component 4 constituting the branch pipe forming device 100 are composed of the split surfaces 3a and 4a along the plane including the axis X of the water pipe W and the axis Y of the branch pipe 2, the embedded bolts U can be operated from the upper side to fix the fitting 7.

[0147] (4) Punching process

[0148] like Figure 10 to Figure 12 As shown, the punching process includes: a punching machine installation process, installing the punching machine 1 on the first dividing component 3; a branch flow path closing process (refer to Figure 3 ), closing the gate valve V provided on the branch pipe 2; and a perforation forming process, moving the hole saw 11 of the punching machine 1 to the cutter accommodating space Sp formed between the first dividing component 3 and the second dividing component 4, and forming a perforation Wa at a position adjacent to the cutter accommodating space Sp.

[0149] In the boring machine installation process, the valve box 6 is fixed to the fitting 7 (first divided component 3), and the boring machine 1 is installed on the valve box 6. When the valve box 6 is fixed to the fitting 7, the valve box fixing bolt 65 is screwed into the valve fixing through hole 64a of the valve box extension 64 of the valve box 6, and the top end of the valve box fixing bolt 65 is abutted against the annular tapered surface 72 on the lower side of the fitting 7. As a result, the annular protrusion 64b of the valve box 6 and the valve box fixing bolt 65 sandwich the fitting 7, and the valve box 6 is fixed to the fitting 7. Then, the valve box flange 62a of the valve box cylinder 62 and the punching flange 14a of the punching housing 14 of the boring machine 1 are fixed by bolts and nuts, and the boring machine 1 is installed to the first divided component 3 via the valve box 6.

[0150] In the branch flow path closing step, the gate valve V provided in the branch pipe 2 is closed to prevent the flow path from changing from the water pipe W to the branch pipe 2 through the perforated opening Wa formed in the subsequent perforated opening forming step (see Figure 3 ). In this way, a gate valve V is provided on the branch pipe 2 clamped by the connecting openings 33 and 43, and a perforated port Wa is formed after the gate valve V is closed to seal the branch flow path of the branch pipe 2, so that piping construction on the downstream side of the gate valve V can be performed in advance. That is, the perforated port Wa can be formed on the water pipe W at any time without causing any obstacles to the piping construction, and the operation efficiency is high.

[0151] In the perforation forming process, when the hole saw 11 and the center drill 12 are rotated and advanced downward by the rotary drive mechanism 13, the center drill 12 is inserted into the guide tube 8, and the cutting blade 11a of the hole saw 11 cuts a part (side) of the outer peripheral surface of the water pipe W, thereby forming a perforation Wa. The cut portion Wb generated by the formation of the perforation Wa is held between the peripheral wall through hole 81a formed in the peripheral wall portion 81 of the guide tube 8 and the inner peripheral surface of the hole saw 11. At this time, since the axis core holding bolt J abuts against the lower side of the outer peripheral surface of the water pipe W (cut portion Wb) in the vertical direction, the axis core of the punching machine 1 can be prevented from being deviated, and the cut portion Wb can be reliably prevented from falling. In addition, the first split member 3 is formed with a cylindrical portion 31 having an opening through which the hole saw 11 can pass, and the split surfaces 3a and 4a of the first split member 3 and the second split member 4 are along a plane including the axis X of the water pipe W and the axis Y of the branch pipe 2. Therefore, compared with the case where the split surfaces 3a and 4a are perpendicular to the plane, the vibration of the punching machine 1 does not directly act on the split surfaces 3a and 4a, and the offset of the cutter axis during the punching operation is small. In addition, in the present embodiment, since the annular convex portion 92 is formed on the outer edge of the flat plate member 9, the chips can be accommodated in the inner space of the annular convex portion 92, so that the chips can be prevented from flowing out to the water pipe W or the branch pipe 2.

[0152] After the perforation opening Wa is formed, if the hole saw 11 and the center drill 12 are moved downward by the rotation drive mechanism 13, the top corner of the center drill 12 abuts against the tapered surface 84a1 of the engaging member 84a, and the engaging member 84a overcomes the force of the compression coil spring 84b and moves radially outward. Then, when the hole saw 11 and the center drill 12 are further moved downward by the rotation drive mechanism 13, the engaging member 84a engages with the annular recess 12a1 by the force of the compression coil spring 84b, and the center drill 12 is held by the holding mechanism 84 of the guide tube 8. In this state, if the hole saw 11 and the center drill 12 are moved upward by the rotation drive mechanism 13, the flat plate member 9 placed on the annular groove 41d formed in the accommodating recess 41a of the second split member 4 and the guide tube 8 fixed to the flat plate member 9 move upward together with the center drill 12. As a result, the punch 1 , the plate member 9 , and the guide tube 8 can be moved toward the upper side of the cover body 5 accommodated in the valve box 6 together with the cut portion Wb.

[0153] (5) Valve closing process

[0154] like Figure 13 to Figure 15As shown, the valve closing process moves the cover body 5 accommodated in the valve box 6 to the cylinder 31 of the first partition member 3 and closes the opening of the cylinder 31. Specifically, first, the end of the valve operating member Vk rotates from one end of the long groove 51a to the other end, thereby sliding the cover body 5 inside the valve box 6, and the portion of the bottom wall 51 where the side wall 52 does not exist passes through the opening 31a of the cylinder 31. In this way, if the portion of the bottom wall 51 where the side wall 52 does not exist is provided, the portion where the side wall 52 does not exist can pass through the opening 31a of the cylinder 31, so that the cover body 5 as the valve core can be slid by the valve operating member Vk. Next, the outer edge of the cover body 5 is pressed by the pressing bolt P screwed into the pressing bolt through hole 63b of the valve box fixing portion 61B. Thus, the annular sealing member S3 provided on the inner surface of the outer edge of the bottom wall 51 of the cover body 5 is in close contact with the upper surface of the opening 31a of the cylinder 31, and the cover body 5 seals the cylinder 31 of the first split member 3. As a result, the interiors of the first split member 3 and the second split member 4 are sealed, and the punch 1 can be removed.

[0155] In this embodiment, a punch removal step is provided between the (5) valve closing step and the (6) cover fixing step. In the punch removal step, after the outer edge of the cover body 5 is pressed by the pressing bolt P to seal the inside of the first split member 3 and the second split member 4, the punch 1, the plate member 9, and the guide tube 8 are removed together with the cut portion Wb (see Fig.12 That is, after the punch 1, the flat plate member 9, and the guide tube 8 are moved to the upper side of the cover 5 together with the cut-off portion Wb, the bolts and nuts fixing the punch flange 14a of the punch housing 14 and the valve box flange 62a are removed, and the punch 1, the flat plate member 9, and the guide tube 8 are removed together with the cut-off portion Wb. Fig.15 As shown, the valve box 6 and the fittings 7 remain as working equipment. In addition, the punching machine removal process may be performed in the (7) valve box removal process described later.

[0156] (6) Cover fixing process

[0157] like Fig.16 As shown, in the cover fixing step, the tip of the contact bolt T is bitten into the annular recess 31a1 of the cylinder 31 of the first split member 3 to fix the cover body 5 to the cylinder 31 (see also Fig.19 Specifically, the closing bolt 63a1 of the operation through hole 63a is removed and an operating tool (not shown) is inserted, and the operating tool is operated from the outside of the valve box 6 to screw the abutment bolt T composed of a hexagon socket bolt into the threaded hole 52a formed in the side wall 52 of the cover body 5 (see also Fig.19). Then, the top end of the abutment bolt T bites into the annular recess 31a1 and the cover body 5 is fixed to the barrel 31 of the first split component 3. In addition, the abutment bolt T can be temporarily screwed with the side wall 52 of the cover body 5 in advance and formally screwed with the operating tool, or the abutment bolt T can be inserted into the operating through hole 63a in a state where the abutment bolt T is installed on the top end of the operating tool, so that the abutment bolt T is screwed with the threaded hole 52a formed on the side wall 52 of the cover body 5. In this way, when the cover body 5 that functions as a closing cover is fixed to the barrel 31, it is sufficient to operate the abutment bolt T from the outside to screw it with the threaded hole 52a, so the working efficiency is extremely high.

[0158] (7) Valve box removal process

[0159] like Fig.17 As shown, the valve box removal process removes the valve box 6 fixed to the fitting 7 fixed to the first split member 3, leaving the branch pipe forming device 100 including the fitting 7. Specifically, the valve box fixing bolts 65 (see also FIG. 6 ) fixing the valve box 6 to the fitting 7 are removed. Fig.12 At this time, the gap between the first split component 3 and the second split component 4 is sealed by the (2) split component connection step, and the branch pipe forming device 100 becomes sealed relative to the water pipe W and the branch pipe 2. In the (6) cover fixing step, the cover body 5 fixed to the cylinder 31 seals the interior of the first split component 3 and the second split component 4, so that water does not leak to the outside of the branch pipe forming device 100.

[0160] (8) Side wall component installation process

[0161] like Figure 18-19 As shown, in the side wall member installation step, the side wall member 53 is installed on the outer edge portion of the bottom wall 51 of the cover body 5 where the side wall 52 does not exist. In the side wall member installation step, it is preferred that the fitting 7 is not removed in the valve box removal step (7), but the fitting 7 is removed after the side wall member 53 is installed. Thus, the side wall member 53 can be inserted into the cover body 5 along the upper surface of the fitting 7.

[0162] After the side wall member 53 is inserted into the outer edge portion of the bottom wall 51 of the cover body 5 where the side wall 52 does not exist, the fixing bolt K is inserted from the through hole 51b of the bottom wall 51 and screwed into the second screw hole 53b, thereby integrating the side wall member 53 with the cover body 5. Then, the side wall member 53 is fixed to the cylinder 31 of the first split component 3 by screwing the contact bolt T into the first screw hole 53a, and the tip of the contact bolt T bites into the annular recess 31a1. Next, the embedded bolt U that fixes the fitting 7 to the columnar portion 31c of the first split component 3 is removed, and the fittings 7 of the split structure are removed one by one. In this way, if the side wall member 53 is installed in the outer edge portion of the bottom wall 51 where the side wall 52 does not exist, the fixed posture of the cover body 5 as a closed cover is stable. In addition, if the fixing bolt K is inserted into the through hole 51b of the bottom wall 51 and the side wall member 53 is fixed, the cover body 5 as a closed cover can be firmly fixed. Furthermore, if the through hole 51 b is provided in the bottom wall 51 , the fixing bolt K can be operated from above, and the working efficiency can be improved.

[0163] [Other embodiments]

[0164] In the following, regarding other embodiments, only the structures different from the branch pipe forming device 100 involved in the above-mentioned embodiment will be described. In addition, for easy understanding, the same structure as the branch pipe forming device 100 involved in the above-mentioned embodiment is described using the same component names and reference numerals.

[0165] (1) In the above-described embodiment, the end of the peripheral wall portion 81 of the guide tube 8 is engaged with the engaging recessed portion 41b formed on the bottom 41 of the second split component 4. Alternatively, a recessed portion may be provided at the end of the peripheral wall portion 81 of the guide tube 8, and a convex portion (engaging convex portion) may be provided on the bottom 41 of the second split component 4, and these recessed portions and convex portions may be engaged.

[0166] (2) In the above-mentioned embodiment, a long groove 51a that engages with the end of the valve operating component Vk is provided on the outer surface of the bottom wall 51 of the cover body 5, and the cover body 5 is slid and moved by the valve operating component Vk. However, the top end of the push rod component can also be engaged with the engaging groove provided on the side wall 52 of the cover body 5, and the cover body 5 can be slid and moved by utilizing the pushing component.

[0167] (3) Fig. 20 As shown, the end flange 2A of the branch pipe 2 is clamped by the connection openings 33 and 43 of the first split component 3 and the second split component 4. The branch pipe 2 in this embodiment omits the short pipe 21 in the above embodiment, and has an end flange 2A at the end of the connection pipe 22 having the gate valve V. The flange 22b on the opposite side of the end flange 2A of the connection pipe 22 is connected to another connection pipe (not shown).

[0168] (4) Fig.21As shown, the branch pipe 2 is composed of a bent pipe having a pipe joint 28, and the end flange 2A of the branch pipe 2 is clamped by the connection openings 33 and 43 of the first split component 3 and the second split component 4. In the branch pipe 2 of this embodiment, the short pipe 21 and the connection pipe 22 having the gate valve V are connected by the pipe joint 28. Another connection pipe is connected to the flange 22b on the opposite side of the pipe joint 28 of the connection pipe 22.

[0169] (5) The existing pipe in the above-mentioned embodiment is not limited to the water pipe W, but may be a pipe for other fluids.

[0170] (6) Fig. 22 FIG. 1 shows a side view of a branch pipe forming device 100A according to another embodiment 1. In the above embodiment, the branch pipe forming device 100 is fixed to the water pipe W in a non-rotating manner by the position fixing bolt 38 whose top end abuts against the outer peripheral surface of the water pipe W. Fig. 22 As shown, a plurality of (six in this embodiment) anti-rotation protrusions 32a2, 42a2 may be provided on the inner circumference of the first curved portion 32a of the first split component 3 and the second curved portion 42a of the second split component 4. These anti-rotation protrusions 32a2, 42a2 are preferably provided at equal intervals along the outer circumference of the water pipe W. In addition, these anti-rotation protrusions 32a2, 42a2 may be in the form of ribs that bulge out integrally from the inner surfaces of the first curved portion 32a and the second curved portion 42a, or may be other components such as wedges, screws, etc. that are fixed to the concave grooves on the inner surfaces of the first curved portion 32a and the second curved portion 42a.

[0171] (7) Fig.23 2 shows a cross-sectional view of a punching process using a branch pipe forming device 100B according to another embodiment 2. In the branch pipe forming device 100 according to the above embodiment, a guide tube 8 is provided to guide the center drill 12 of the punching machine 1. Fig.23As shown, the center drill 12 of the drilling machine 1 may be omitted, and the rotation axis of the hole saw 11 may be arranged in the tangential direction of the outer periphery of the water pipe W. In addition, instead of the guide tube 8 and the flat plate member 9 connected to the guide tube 8, a cutter guide member 10 arranged inside the hole saw 11 and a flat plate member 10a formed integrally with one end (top end) of the cutter guide member 10 may be provided. A curved recessed portion 10b along the outer periphery of the water pipe W is formed in the middle of the cutter guide member 10, and an annular flange 10c is formed at the other end (base end) of the cutter guide member 10. In addition, an engaging member 11b protruding inward in an annular shape is formed on the inside of the hole saw 11, and an engaged portion 10c1 that can engage with the engaging member 11b is formed on the annular flange 10c. The engaged portion 10c1 may be a locking ring embedded in the annular flange 10c, or a block-shaped member urged by an elastic member such as a spring. As the hole saw 11 rotates and moves downward, the inclined surface 11b1 of the engaging part 11b abuts against the inclined surface 10c2 of the engaged portion 10c1, and the engaged portion 10c1 moves radially inward. As a result, after the hole saw 11 passes through the annular flange 10c, the engaged portion 10c1 moves radially outward, and the engaging part 11b engages with the engaged portion 10c1. The flat plate member 10a has the same shape as the above-mentioned flat plate member 9, so a detailed description is omitted. In this embodiment, by omitting the center drill bit 12 of the punch 1, the hole saw 11 can be brought close to the water pipe W side, and cutting can be performed with an opening width equal to the diameter of the cutter of the hole saw 11. That is, the cutter diameter of the hole saw 11 can be reduced, and the cutter storage space Sp can be reduced to achieve compactness of the branch pipe forming device 100B.

[0172] In the split component connection step, the cutter guide member 10 is accommodated in the cutter accommodation space Sp through the opening 31a of the barrel 31 of the first split component 3 or the opening of the branch pipe 2. The cutter guide member 10 may also be composed of a split body so that it can be easily accommodated in the cutter accommodation space Sp. In the perforation forming step, when the hole saw 11 is rotated by the rotary drive mechanism 13 while moving in the downward direction, the hole saw 11 is fitted onto the cutter guide member 10, and a part of the outer peripheral surface (side surface) of the water pipe W is cut by the cutting blade 11a of the hole saw 11, thereby forming a perforation Wa. At this time, the engaged portion 10c1 abuts against the inner peripheral surface of the hole saw 11, thereby suppressing the vibration of the hole saw 11. The cut portion Wb generated by the formation of the perforation Wa is sandwiched and held between the curved recess 10b of the cutter guide member 10 and the inner peripheral surface of the hole saw 11. After the perforated opening Wa is formed, if the hole saw 11 is moved downward by the rotary drive mechanism 13, the engaging member 11b of the hole saw 11 engages with the engaged portion 10c1, and the hole saw 11 is held by the cutter guide member 10. In this state, when the hole saw 11 is moved upward backward by the rotary drive mechanism 13, the cutter guide member 10 holding the cut portion Wb moves upward together with the hole saw 11.

[0173] (8) Fig.24 , a cross-sectional view showing a valve closing process using the cover 5A according to another embodiment 3 is shown. In the above-mentioned embodiment, the cover 5 that closes the opening 31a of the cylinder 31 of the first split member 3 has a bottom wall 51 and a side wall 52 that rises from the outer edge of the bottom wall 51. Fig.24 As shown, the cover body 5A may be formed of a flat plate member 54 having a circular shape in a plan view without the side wall 52. In the present embodiment, the fitting 7 is made to function as a detachable flange, and the cover body 5A is fixed to the fitting 7 by a cover fastening member 73 composed of bolts or the like. The cover body 5A functions as a valve core that blocks the flow path of the cylinder 31 as a pipeline, and also functions as a closing cover that closes the cylinder 31. In the present embodiment, by separating the first split member 3 from the fitting 7, it is not necessary to provide a flange formed integrally with the first split member 3 in order to fix the cover body 5A, and the manufacturing cost can be reduced.

[0174] (9) Fig.25 and Fig.26, a cross-sectional view showing a state where the branch pipe 2 is mounted on the branch pipe forming device 100C according to another embodiment 4 and a top view of the second split component 4 are shown. In order to prevent the branch pipe 2 from moving to the cutter storage space Sp, the branch pipe forming device 100C in this embodiment has abutting protrusions 34 and 44 that abut against the end flange 2A protruding from the inner surface to the inside (the cutter storage space Sp side) formed on the connecting openings 33 and 43 of the first split component 3 and the second split component 4. These abutting protrusions 34 and 44 are formed by curved parts that protrude inwardly along the end flange 2A from a pair of side walls of the connecting openings 33 and 43, and are configured not to hinder the flow of water in the branch flow path of the branch pipe 2. In this embodiment, the connecting openings 33 and 43 firmly clamp the end flange 2A of the branch pipe 2 in a sealed state, so that even when a bending force or a pressing force acts on the branch pipe 2 due to an earthquake or the like, the branch pipe 2 can be prevented from entering the cutter storage space Sp side.

[0175] (10) Fig. 27 2 shows a cross-sectional view showing a state where a branch pipe 2 is installed in a branch pipe forming device 100D according to another embodiment 5. In the above-mentioned embodiment, the end flange 2A of the branch pipe 2 is accommodated inside the connecting openings 33 and 43 (on the side of the cutter accommodation space Sp). Fig. 27 As shown, the branch pipe 2 may be inserted into the connecting openings 33 and 43, the end flange 2A of the branch pipe 2 may be arranged outside the connecting openings 33 and 43, and a pair of fixing members 35 and 45 for fixing the end flange 2A may be installed in the pair of connecting openings 33 and 43. In the case of this embodiment, the branch pipe 2 can be installed and removed without disassembling the branch pipe forming device 100D.

[0176] (11) Figure 28 to Figure 30 1 is a diagram showing a branch pipe forming device 100E and a vibration-damping member 15 according to another embodiment 6. As described above, the hole saw 11 is formed into a cylindrical shape including a cutting blade 11a at the top. In the hole saw 11 according to this embodiment, a vibration-absorbing disc-shaped vibration-damping member 15 is inserted, and an elastic member 15a that contacts the inner peripheral surface of the hole saw 11 is fixed to the outer peripheral end surface of the vibration-damping member 15.

[0177] like Fig.28As shown, the branch pipe forming device 100E involved in this embodiment has a pair of blocks 83 (four in total) protrudingly formed on both sides of the peripheral wall portion 81A of the guide tube 8A along the axis X of the water pipe W, and the pair of blocks 83 are respectively abutted against the upper side and the lower side in the vertical direction of the outer peripheral surface of the water pipe W (cut portion Wb), and the axis retaining bolts J for preventing the axis deviation of the punching machine 1 are screwed. In addition, on the inner peripheral surface of the upper side in the vertical direction of the peripheral wall portion 81A of the guide tube 8A in this embodiment, guide protrusions 81Aa are protrudingly formed throughout the circumference to guide along the tapered shape of the top end portion 12a of the center drill 12.

[0178] like Fig.30 As shown, the vibration-damping component 15 includes: a disk-shaped body 15b made of the same material as the hole saw 11, and a plurality of (four in this embodiment) elastic components 15a made of rubber or resin fixed to the outer peripheral surface of the disk-shaped body 15b. A through hole 15c is formed in the center of the disk-shaped body 15b, and the vibration-damping component 15 is inserted into the hole saw 11 by inserting the center drill 12 without a cutter function into the through hole 15c. Since the disk-shaped body 15b is supported by the center drill 12 without a cutter function, the vibration-damping component 15 will not be displaced due to vibration. The plurality of elastic components 15a are divided into a plurality of parts in a manner that does not overlap with the cutting blade 11a when viewed in the direction of the rotation axis of the hole saw 11. Therefore, when the vibration-damping component 15 is inserted into the hole saw 11, it is possible to prevent the elastic component 15a from contacting with the cutting blade 11a and being damaged. In this way, an elastic member 15a that contacts the inner peripheral surface of the hole saw 11 is fixed to the outer peripheral end surface of the vibration-damping member 15 inserted into the hole saw 11, so that the elastic member 15a absorbs the vibration of the hole saw 11. In addition, in the hole saw 11, a plurality of fluid passage holes 11c are formed in a staggered manner to pass through the fluid ejected accompanying the drilling. In addition, the elastic member 15a may be provided on the entire outer periphery of the disc-shaped body 15b, or the elastic member may be provided between the through hole 15c and the center drill 12, or a plurality of weight-reducing holes may be provided in the disc-shaped body 15b. In addition, the shape of each cutting blade 11a in the hole saw 11 may be as follows: Fig.30 The partially protruding shape as shown may also be a shape that is inclined in the circumferential direction and has a sharp cutting portion.

[0179] like Fig.29As shown, in the punching process, the hole saw 11 of the punching machine 1 is moved to the cutter accommodating space Sp formed between the first dividing component 3 and the second dividing component 4, and the punching hole Wa is formed at a position adjacent to the cutter accommodating space Sp. At this time, the central portion (the peripheral portion of the through hole 15c) of the vibration-damping member 15 inserted into the hole saw 11 abuts against the upper end of the guide tube 8A, and as the hole saw 11 moves downward, the vibration-damping member 15 rises inside the hole saw 11. In this embodiment, an elastic member 15a that abuts against the inner peripheral surface of the hole saw 11 is fixed to the outer peripheral end surface of the vibration-damping member 15, so that the elastic member 15a smoothly rises while sliding on the inner peripheral surface of the hole saw 11. In addition, due to the elastic member 15a, the disc-shaped main body 15b of the vibration-damping member 15 does not amplify the vibration of the hole saw 11, thereby preventing the vibration of the hole saw 11. Furthermore, since the central portion of the disk-shaped main body 15b abuts against the upper end of the guide tube 8A, the movement posture of the vibration-damping member 15 is stable, and the vibration of the hole saw 11 can be reliably prevented. As a result, the drilling operation can be performed quickly and smoothly. Fig.28 As shown, the disc-shaped body 15b is disposed inside the hole saw 11, but it may also be disposed at the upper end of the guide tube 8A. That is, when the hole saw 11 is used to perforate the water pipe W, the disc-shaped body 15b may be located inside the hole saw 11.

[0180] (12) Figure 31 to Figure 35 1 is a diagram showing a branch pipe forming device 100F and an anti-corrosion component 93 according to another embodiment 7. The branch pipe forming device 100F in this embodiment further includes a mounting fixture 46 for mounting the anti-corrosion component 93 on the perforated port Wa. The mounting fixture 46 has: a telescopic mechanism 46A, which can press the anti-corrosion component 93 against the perforated port Wa from the axis Y direction of the branch pipe 2 and can be detached from the anti-corrosion component 93; and a fixture housing 46B, which is connected to the valve box 6 and accommodates the telescopic mechanism 46A in a sealed state.

[0181] The telescopic mechanism 46A includes: an operating rod 46a having an external thread formed on the outer periphery; a pair of movable blocks 46b that are screwed together with the operating rod 46a and can move up and down; a link member 46c, one end of which is fixed to the movable block 46b so that the diameter is expanded or reduced by the descent or ascent of the upper movable block 46b, and the diameter is expanded or reduced by the ascent or descent of the lower movable block 46b; a cylindrical holding member 46d that holds the anti-corrosion member 93; and a pair of abutment blocks 46e that can abut against the end flange 2A of the branch pipe 2. The pair of holding members 46d and the abutment blocks 46e are fixed to the other end of the link member 46c in a manner that moves in conjunction with the expansion or reduction of the diameter of the link member 46c.

[0182] like Fig.34As shown, the anti-corrosion component 93 includes: an annular anti-corrosion seal 93A having an end face along the shape of the through hole Wa; and an expansion component 93B, which uses a tapered surface 93Ba1 that abuts against the inner peripheral surface of the annular anti-corrosion seal 93A to expand the diameter of the annular anti-corrosion seal 93A. The annular anti-corrosion seal 93A is composed of a component that can be elastically deformed, such as rubber, which is expanded by the expansion component 93B, and has: a cylindrical portion 93Aa, which has a close contact portion 93Aa1 formed at the top end to be in close contact with the inner peripheral surface of the through hole Wa; and a sealing portion 93Ab, which protrudes outward in an annular shape from the cylindrical portion 93Aa and abuts against the through hole Wa to perform sealing. The expansion member 93B includes an annular base 93Bb that contacts the flange 46d1 of the retaining member 46d, and a protruding cylinder 93Ba that is inserted along the inner circumference of the cylindrical portion 93Aa and protrudes from the annular base 93Bb. The protruding cylinder 93Ba is formed with a tapered surface 93Ba1 that expands along the inner circumference of the cylindrical portion 93Aa over the entire circumference, and the top end 93Ba2 is formed into an arcuate shape along the shape of the through hole Wa and the close contact portion 93Aa1 when viewed from the side. In this way, if the anti-corrosion member 93 includes the expansion member 93B that expands the diameter of the annular anti-corrosion seal 93A, the annular anti-corrosion seal 93A can be reliably close to the through hole Wa.

[0183] like Fig.35 As shown in the front view of the annular anti-corrosion seal 93A, a tapered surface that becomes thinner toward the top is formed on the inner circumference of the close contact portion 93Aa1. Due to the tapered surface, when the close contact portion 93Aa1 is in close contact with the perforated opening Wa, it becomes a shape along the inner circumference of the water pipe W, thereby reducing the flow path resistance (see Fig.33 ). In addition, Fig.35 As shown in the rear view of the annular anti-corrosion seal 93A, the inner circumference of the cylindrical portion 93Aa is not inclined, and is parallel to the axis Y of the branch pipe 2 in a manner that the inner circumference is one circle when viewed from the rear. Therefore, when the expansion member 93B is inserted into the cylindrical portion 93Aa, the cylindrical portion 93Aa is uniformly expanded along the tapered surface 93Ba1 of the expansion member 93B. Fig.35 As shown in the top view and the side view of the annular anti-corrosion seal 93A, the close contact portion 93Aa1 and the sealing portion 93Ab are formed into a convex arc shape when viewed from the top and a concave arc shape when viewed from the side. As a result, the close contact portion 93Aa1 and the sealing portion 93Ab are formed into a shape along the shape of the perforation Wa, and the perforation Wa can be reliably protected from corrosion.

[0184] The anti-corrosion component installation process of installing the anti-corrosion component 93 at the punching port Wa using the installation jig 46 is performed after the valve closing process in the above-mentioned branch pipe forming method and after the punching machine 1 is removed. After the installation jig 46 is removed, the valve closing process and the cover fixing process are performed again. Fig.31 As shown in FIG. 4 , the mounting jig 46 is arranged so that the corrosion-resistant member 93 faces the perforated opening Wa formed by the perforating process. Fig.32 As shown in FIG. 1 , when the operating rod 46a is rotated, the upper movable block 46b descends and the lower movable block 46b ascends, and as the diameter of the connecting rod member 46c is expanded, the anti-corrosion member 93 moves toward the perforation Wa via the retaining member 46d, and the pair of abutting blocks 46e abut against the end flange 2A of the branch pipe 2. Next, when the operating rod 46a is rotated while the pair of abutting blocks 46e abut against the end flange 2A of the branch pipe 2, as shown in FIG. Fig.33 As shown, the anti-corrosion member 93 is uniformly enlarged in diameter along the tapered surface 93Ba1 of the expansion member 93B, the cylindrical portion 93Aa abuts against the annular base 93Bb of the expansion member 93B, and the close contact portion 93Aa1 and the sealing portion 93Ab are closely contacted and fixed to the perforation Wa. Next, the mounting fixture 46 is detached from the anti-corrosion member 93 composed of the annular anti-corrosion seal 93A and the expansion member 93B, and the mounting fixture 46 is removed.

[0185] As in the present embodiment, if the mounting fixture 46 for mounting the anti-corrosion component 93 at the perforated opening Wa has a telescopic mechanism 46A, the anti-corrosion component 93 can be pressed against the perforated opening Wa from the axial core Y direction of the branch pipe 2 by utilizing the connecting openings 33 and 43 (the end flange 2A of the branch pipe 2) opposite to the perforated opening Wa, so that the anti-corrosion component 93 can be reliably mounted. In addition, if the mounting fixture 46 is detached from the anti-corrosion component 93 and recovered by utilizing the telescopic mechanism 46A, the mounting fixture 46 will not obstruct the flow path of the branch pipe 2.

[0186] (13) Figure 36-37 is a diagram showing a sealing test process and a valve box installation process according to another embodiment 8. Fig.38 FIG. 8 shows an end portion of a valve operating member VkA according to another embodiment 8. The branch pipe forming method in this embodiment includes: the above-mentioned split member arrangement step and split member connection step; a sealing test step (see Fig.36 ), the cover 5 is fixed to the cylinder 31 of the first split component 3 by the abutment bolt T, and water (an example of fluid) is supplied to the inside of the first split component 3 and the second split component 4 to perform a sealing test; the valve box installation process (refer to Fig.37), after discharging the supplied water in the sealing test process, remove the abutment bolt T and install the valve box 6A; the above-mentioned punch installation process and branch flow path closing process; and after moving the cover body 5 to form the opening portion 31a (opening) of the cylinder 31, perform the above-mentioned perforation opening forming process.

[0187] like Fig.36 As shown, in the sealing test process, the end of the branch pipe 2 is blocked (not shown), water is injected and exhausted from the opening 31a, and the cover body 5 that functions as a valve core and a closing cover is used for the sealing test and is fixed to the barrel 31 of the first split component 3 in advance. Then, a water pressure coupler 55a is installed in the water pressure hose connection port 55 of the cover body 5, and water pressure is applied by the water pressure coupler 55a to confirm the sealing state of the first split component 3 and the second split component 4 and the sealing state of the cover body 5. After the sealing is confirmed, the water pressure coupler 55a is removed and the water pressure hose connection port 55 is closed with a countersunk head 55h. Thus, a sealing test can be performed before installing the punching machine 1, etc. In addition, the water pressure hose connection port 55 can be omitted, and water pressure can be applied from the connecting openings 33 and 43 via the branch pipe 2.

[0188] Then, if Fig.37 As shown, the water inside the first split component 3 and the second split component 4 is discharged from the connecting openings 33 and 43, and the abutment bolts T are removed from the cover body 5. Next, after performing the above-mentioned accessory installation process, the valve box 6A is installed on the accessory 7. In this way, the cover body 5 can function as a valve core and a closing cover, and the above-mentioned perforation process, valve closing process, cover fixing process, valve box removal process and side wall member installation process are performed. In this way, after the cover body 5 is fixed to the first split component 3 by the abutment bolts T and the sealing test is performed, the abutment bolts T are removed and the valve box 6A is installed, so that the cover body 5 can also be used for the sealing test. In addition, since the hole saw 11 of the punching machine 1 is moved through the opening formed by moving the cover body 5 to form the perforation Wa, the operation efficiency is high. In addition, it is not forgotten to set the cover body 5 in the valve box 6A.

[0189] The valve box 6A in this embodiment includes: a valve box body 61 that accommodates the cover body 5; a valve operating member VkA that is detachably connected to the valve box body 61; and a closing plate 66 that is detachably connected to the valve box body 61 at a position outside the valve operating member VkA. Figure 37-38As shown, the valve operating member VkA includes: a plate member 67a, which is fixed to the valve box body 61 by bolts; an operating member loading and unloading hole portion 67b, which includes a through hole formed in the plate member 67a; a rotating member 67c, whose end portion rotates from one end of the long groove 51a to the other end; and an operating portion 67d, which is used to engage with the rotating member 67c for rotational operation. The end of the rotating member 67c in this embodiment is mounted with a rotating member 67c1 that can rotate freely relative to the shaft 67c2. The base end side of the rotating member 67c1 is cylindrical, and the top end side is a conical truncated cone with a taper. Through the conical truncated cone shape, the rotating member 67c can reduce the sliding resistance while the rotating member 67c1 rotates smoothly relative to the long groove 51a, so that the cover body 5 can be moved.

[0190] The valve box 6A in this embodiment has a divided structure in which the valve box body 61, the valve operating member VkA and the closing plate 66 are respectively provided. Therefore, after a sealing test is performed using the cover body 5 functioning as a valve core and a closing cover, the valve operating member VkA can be easily engaged with the cover body 5.

[0191] (14) Fig.39 : is a diagram showing the cover replacement process involved in other embodiment 9. After the perforation process is completed, if the waterproof performance of the cover body 5 is poor due to the valve closing process and the cover fixing process, the cover body 5 needs to be replaced. Therefore, the branch pipe forming method in the present embodiment also includes a cover replacement process using a flow path closing fixture 75. In this cover replacement process, the cover body 5 is opened, and the waterproof seal 75a of the flow path closing fixture 75 is expanded by compression deformation, fluid pressure, etc., so that the inner circumferential surface of the barrel 31 of the first split component 3 is closely attached. Next, the closing plate 66, the valve operating component VkA and the cover body 5 of the above-mentioned valve box 6A are removed in sequence. Next, a new cover body 5 is prepared, and the cover body 5, the valve operating component VkA and the closing plate 66 are installed in sequence. After shrinking the waterproof seal 75a of the flow path closing fixture 75 and raising it, the waterproof performance of the new cover body 5 is confirmed by the valve closing process and the cover fixing process. In the present embodiment, since the closing plate 66 is detachably connected to the valve box body 61 , even when the cover body 5 has a malfunction, it can be quickly replaced.

[0192] (15) The structures disclosed in the above-mentioned embodiments can be combined partially or entirely.

[0193] Industrial availability

[0194] The present invention can be used for a branch pipe forming device, a valve core-serving cover, a branch pipe forming device including a valve core-serving cover, and a branch pipe forming method. The branch pipe forming device is installed on an existing pipe in order to form a branch pipe connected to a perforated port without interrupting flow. The perforated port is formed by perforating a portion of the outer peripheral surface of the existing pipe with a puncher.

[0195] 1: Punching machine

[0196] 2: Branch pipe

[0197] 2A: End flange (end)

[0198] 3: The first segmentation component

[0199] 3a: First dividing surface (dividing surface)

[0200] 4: Second segmentation component

[0201] 4a: Second dividing surface (dividing surface)

[0202] 5: Cover (also used as valve core cover)

[0203] 6: Valve box

[0204] 6A: Valve box

[0205] 7: Accessories

[0206] 8: Guide tube

[0207] 9: Flat panel parts

[0208] 11: Hole saw (cutter)

[0209] 11a: Cutting insert

[0210] 12: Center drill bit

[0211] 12a1: Annular concave part

[0212] 15: Vibration reduction components

[0213] 15a: Elastic component

[0214] 31: Cylinder (pipeline)

[0215] 31a: Opening

[0216] 31a1: Annular concave portion (end outer peripheral surface)

[0217] 31c: Columnar part

[0218] 31c2: seat surface

[0219] 33: First connection opening (connection opening)

[0220] 41: Bottom

[0221] 41a: Accommodating recess

[0222] 41b: Engagement recess

[0223] 43: Second connection opening (connection opening)

[0224] 46: Install the fixture

[0225] 46A: Telescopic mechanism

[0226] 51: Bottom wall

[0227] 51a: Long groove (engaging portion)

[0228] 51b: Through hole

[0229] 52: Sidewall

[0230] 52a: threaded hole

[0231] 53: Side wall components

[0232] 61: Valve box body

[0233] 66: Closed plate

[0234] 82: Protrusion

[0235] 84a: Engagement member

[0236] 84a1: Cone

[0237] 84b: Compression coil spring (force applying component)

[0238] 92: Annular convex part

[0239] 93: Anti-corrosion parts

[0240] 93A: Annular anti-corrosion seal

[0241] 93B: Expansion Parts

[0242] 93Ba1: Conical surface

[0243] 100: Branch pipe forming device

[0244] B: Fastening parts

[0245] J: Axis retaining bolt (bolt)

[0246] K: Fixing bolt

[0247] Sp: Cut-off device storage space

[0248] T: Butt bolt

[0249] V: Gate valve

[0250] Vk: Valve operating parts

[0251] VkA: Valve operating parts

[0252] W: Water pipe (already installed)

[0253] Wa: Perforation

[0254] X: Axis

[0255] Y: Axis core

[0256] Z: axis

Claims

1. A branch pipe forming device, which is installed on an existing pipe in order to form a branch pipe connected to a perforated opening without interrupting flow, wherein the perforated opening is formed by perforating a part of the outer peripheral surface of the existing pipe by a perforator, The branch pipe forming device include: A first dividing member and a second dividing member, wherein the first dividing member and the second dividing member have dividing surfaces along a plane including the axis of the installed pipe and the axis of the branch pipe, and are connected to each other by a fastening member in a sealed state; as well as A cylindrical guide tube is inserted into the center drill of the punching machine for guiding. The first dividing member has a cylindrical portion, and the cylindrical portion has an opening through which a cutter of the punch can pass. A cutter accommodating space is formed between the first dividing member and the second dividing member, and the cutter accommodating space can accommodate the cutter at a position adjacent to the perforated opening, and the perforated opening is formed in a direction perpendicular to the plane. The axis of the cylindrical portion is located in the cutter accommodation space at a position closer to the branch pipe than the outer peripheral surface of the existing pipe. A connection opening portion is formed at a connection portion between the first split member and the second split member, the connection opening portion being opposed to the perforation port via the cutter accommodation space, and the connection opening portion clamps the end of the branch pipe in a sealed state. A bolt is screwed into the guide tube, and the bolt abuts against the lower side of the outer peripheral surface of the installed pipe in the vertical direction to prevent the axial center of the punch from shifting.

2. The branch pipe forming device according to claim 1, in, The cutter is accommodated in the cutter accommodation space, and the diameter of the cutter is smaller than the outer diameter of the existing pipe.

3. The branch pipe forming device according to claim 1 or 2, in, The guide tube extends from the second division member toward the opening side relative to the division surface.

4. The branch pipe forming device according to claim 1 or 2, in, The axis of the guide tube is perpendicular to the dividing surface.

5. The branch pipe forming device according to claim 1 or 2, further comprising: include: a flat plate member placed on the bottom of the second split member and connected to the guide tube, The bottom of the second divided member is formed with: a housing recessed portion for housing the flat plate member; and an engaging recessed portion or an engaging convex portion for engaging with the end of the guide tube at the center of the housing recessed portion.

6. The branch pipe forming device according to claim 5, in, The flat plate member is composed of a plurality of divided plates.

7. The branch pipe forming device according to claim 5, in, An annular convex portion protruding toward the perforated opening is formed on the outer edge of the flat plate member.

8. The branch pipe forming device according to claim 5, in, A protrusion is formed at the end of the guide tube, the protrusion protrudes radially outward and is connected to the flat plate member. The protruding portion contains an engaging member that can engage with an annular recess formed on the outer peripheral surface of the center drill and a biasing member that biases the engaging member radially inward toward the annular recess.

9. The branch pipe forming device according to claim 8, in, The engaging member is formed with a tapered surface capable of abutting against the tip of the center drill. The engagement member overcomes the biasing force of the biasing member and moves radially outward when the tip of the center drill contacts the tapered surface.

10. A branch pipe forming device, which is installed on an existing pipe in order to form a branch pipe connected to a perforated opening without interrupting flow, wherein the perforated opening is formed by perforating a part of the outer peripheral surface of the existing pipe by a perforator, The branch pipe forming device include: A first split component and a second split component connected to each other by a fastening component in a sealed state; as well as A cylindrical guide tube is inserted into the center drill of the punching machine for guiding. A cutter accommodating space is formed between the first dividing member and the second dividing member, and the cutter accommodating space can accommodate a cutter of the puncher at a position adjacent to the punching opening. The cutter has a cylindrical hole saw having a cutting blade at the top. A disc-shaped vibration-absorbing component for absorbing vibration is inserted into the hole saw. An elastic member abutting against the inner peripheral surface of the hole saw is fixed to the outer peripheral end surface of the vibration damping member. A bolt is screwed into the guide tube, and the bolt abuts against the lower side of the outer peripheral surface of the installed pipe in the vertical direction to prevent the axial center of the punch from shifting.

11. The branch pipe forming device according to claim 10, in, The elastic member is divided into a plurality of parts so as not to overlap with the cutting blade when viewed from the rotation axis direction of the hole saw.

12. The branch pipe forming device according to claim 1 or 10, further comprising: include: A mounting fixture, which mounts the corrosion resistant component on the perforated opening, The mounting fixture has a telescopic mechanism, which can press the anti-corrosion component against the perforation port from the axial direction of the branch pipe and can be detached from the anti-corrosion component.

13. The branch pipe forming device according to claim 12, in, The anti-corrosion component includes: an annular anti-corrosion seal that follows the shape of the through hole; and an expansion component that expands the diameter of the annular anti-corrosion seal using a tapered surface that abuts against an inner peripheral surface of the annular anti-corrosion seal.

14. A branch pipe forming method using the branch pipe forming device according to any one of claims 1 to 13, wherein the branch pipe forming method include: a dividing component disposing step of arranging the first dividing component and the second dividing component on the installed pipe; a split component connecting step of clamping the end of the branch pipe between the first split component and the second split component, and connecting the first split component and the second split component in a sealed state using a fastening component; A punch installation step of installing the punch on the first split component; a branch flow path closing step, closing a gate valve disposed on the branch pipe; and The perforation forming step moves the cutter to the cutter accommodation space and forms the perforation at a position adjacent to the cutter accommodation space.

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