JP5584344B1 - Rehabilitation pipe branching method and branching part structure - Google Patents

Abstract

To provide a branching method for a rehabilitation pipe that can prevent water leakage between a main pipe and a rehabilitation pipe, and water leakage when a neck is pierced or a crack is generated, while being able to branch relatively easily.
A branching method of a rehabilitating pipe disposed in a pipe line of the main pipe to a side of the branch pipe inside a branch pipe having a main pipe and a branch pipe branched from the main pipe, The pipe drilling process, the rubber wheel mounting process, the sleeve insertion process, the rubber wheel compression process, the diameter expansion process, and the pressure release process are included.
[Selection] Figure 11

Description

  The present invention relates to a method for branching a rehabilitating pipe inside a branch pipe and a branching part structure.

  2. Description of the Related Art Conventionally, as a means for transferring a liquid fluid such as water or fuel oil, piping equipment configured by connecting a plurality of pipings has been widely used.

  As an example of such a piping facility, for example, a water facility constructed by burying a water pipe underground.

  After being buried in the ground at the time of the first construction, the water pipe used in the water supply facility continues to circulate the water as it is for many years, so that the inner peripheral surface of the pipe gradually deteriorates over time.

  The piping of the aging piping equipment has a high risk of water leakage and requires some allowance. However, if the piping itself is replaced with a new one, a large amount of money is required. In addition, replacement work with new piping requires a long construction period, and it is not preferable that the facilities that form the basis of life, such as waterworks, stop functioning for a long time.

  Therefore, the pipe itself is left as it is, and a flexible pipe (hereinafter also referred to as a rehabilitation pipe) coated with a curable resin or the like is attached to the inner peripheral surface of the pipe and hardened by being aged. The repair which reinforces the internal peripheral surface of piping is performed (for example, refer patent document 1).

  According to such a repair method, it is possible to maintain the function of the piping with a relatively low construction cost and construction period.

JP 2011-042164 A

  By the way, regardless of the water pipe, there is a case where a branch pipe is formed in the pipe used for the piping facility in order to separate a part of the liquid fluid flowing through the main pipe.

  A branch pipe such as a so-called T-shaped pipe formed integrally with the internal flow path having a T-shape is used at the branch portion of such a pipe.

  The inside of the branch pipe also deteriorates over time due to long-term use, but if the inner peripheral surface of the main pipe is reinforced by the repair method described above, the connection opening from the main pipe to the branch pipe will be blocked by the rehabilitation pipe .

  Of course, if a drill or the like is inserted from the flow path side of the branch pipe to perforate the surface of the rehabilitation pipe, the liquid fluid flowing in the main pipe (rehabilitation pipe) can be guided to the branch pipe side. Since it does not necessarily adhere to the entire circumference of the pipe wall of the main pipe, it is necessary to prevent water leakage between the main pipe and the rehabilitation pipe.

  However, it was difficult to branch the rehabilitation pipe while preventing water leakage in this part.

  In addition, there has been a demand for preventing water leakage even when the base portion of the branch pipe of the branch pipe (hereinafter also referred to as the neck of the branch pipe) is perforated or cracked due to an earthquake or the like.

  The present invention has been made in view of such circumstances, and it is possible to branch water relatively easily between the main pipe and the rehabilitation pipe, or when the neck is perforated or a crack occurs. A rehabilitating pipe branching method and a branching part structure capable of preventing water leakage are provided.

  In order to solve the above-described conventional problems, the rehabilitating pipe branching method according to the present invention is arranged in a main pipe and a branch pipe provided with a branch pipe branched from the main pipe, in the main pipe. A method of branching the rehabilitated pipe to the branch pipe side, the rehabilitating pipe drilling step of drilling the rehabilitated pipe by inserting a drill blade from the branch pipe, and the perforated part formed in the rehabilitated pipe is cylindrical The rubber ring is mounted between the inner peripheral surface of the branch pipe and the outer peripheral surface of the rubber ring, and a rubber ring mounting step in which the lower end of the rubber ring is exposed inside the rehabilitation pipe. A sleeve insertion step of inserting an outer sleeve, and an inner sleeve provided with a collar portion capable of directly or indirectly pressing an upper end of the rubber ring, and mounted in a cylindrical shape of the rubber ring; Applying a pressing force, the rubber ring is connected to the rehabilitation pipe through the flange. By contracting, the lower end of the inner sleeve is exposed from the lower end of the rubber ring to the inside of the rehabilitating pipe, and the peripheral wall of the rubber ring is brought into close contact with the inner peripheral surface of the outer sleeve, and is attached to the outer surface of the rehabilitating pipe. A rubber ring compression process for deforming into a build-up shape, and folding the lower end of the inner sleeve outward while winding a part of the rubber ring exposed inside the rehabilitation pipe, to the rehabilitation pipe A diameter expanding step for caulking the interior sleeve and a pressure releasing step for releasing the pressing force and forming a branch portion in the rehabilitating pipe are provided.

Moreover, in the branch part structure of the rehabilitation pipe according to the present invention, the branch pipe of the rehabilitation pipe disposed in the pipe of the main pipe inside the branch pipe having a main pipe and a branch pipe branched from the main pipe. A side branch structure, a perforated portion formed in the rehabilitated tube, a cylindrical rubber ring attached to the perforated portion and having a lower end inserted into the rehabilitated tube, and the branch tube An outer sleeve mounted between the inner peripheral surface and the outer peripheral surface of the rubber ring, and a flange that directly or indirectly presses the upper end of the rubber ring, and is mounted in the cylindrical inside of the rubber ring. An inner sleeve, and a lower end of the inner sleeve is bent in a state of turning outward while winding a part of a rubber ring that has entered the inner wall of the rehabilitation pipe, and the inner sleeve is caulked to the rehabilitation pipe. The rubber ring is connected to the flange portion of the interior sleeve and the caulking stop. The wall of the rehabilitating pipe is formed by a rehabilitation pipe internal buildup part formed by the rubber ring formed by the crimping stop and a rehabilitation pipe external buildup part formed by compression of the rubber ring. The perforated rim water stop portion sandwiched between the outer sleeve and the inner sleeve is formed between the outer sleeve and the inner sleeve, and an inter-sleeve water stop portion formed by bringing a rubber ring into close contact therewith.

  Moreover, in the branch part structure of the rehabilitation pipe according to the present invention, the upper end of the outer sleeve is provided with a hook-like locking part that comes into contact with the branch pipe side flange formed at the opening end of the branch pipe. It also has a feature.

  Further, the branch structure of the rehabilitating pipe according to the present invention is characterized in that the lower part of the outer sleeve is expanded along the inner wall of the neck of the branch pipe by deformation accompanying the compression of the rubber ring.

  Moreover, in the branch part structure of the rehabilitation pipe according to the present invention, the branch pipe is provided with a connecting member connected to the branch pipe on a branch pipe side flange formed at an opening end of the branch pipe. A connecting member side flange is connected, and the inner sleeve includes a protruding portion protruding from an end surface of the branch pipe side flange, and the inner sleeve is provided between the branch pipe side flange and the connecting member side flange. A detachment prevention plate having a hole having a diameter larger than the outer diameter of the branch pipe and smaller than the inner diameter of the branch pipe is interposed, and the detachment prevention plate is positioned above the detachment prevention plate of the protrusion. Another feature is that a disengagement locking portion formed to have an outer diameter larger than the diameter of the hole portion is provided.

  According to the branching method of the rehabilitating pipe according to claim 1, the branch pipe of the rehabilitating pipe disposed in the pipe of the main pipe inside the branch pipe including the main pipe and the branch pipe branched from the main pipe. A branching method to the side, wherein a reed tube is drilled from the branch pipe to perforate the rehabilitated pipe, and a cylindrical rubber ring is attached to the perforated part formed in the rehabilitated pipe, A rubber wheel mounting step in which the lower end of the rubber ring is exposed inside the rehabilitation pipe, an exterior sleeve mounted between the inner peripheral surface of the branch pipe and the outer peripheral surface of the rubber ring, and the rubber A sleeve insertion step of inserting an inner sleeve, which is provided with a collar portion capable of directly or indirectly pressing the upper end of the ring, and is mounted inside the cylindrical shape of the rubber ring; By compressing the rubber ring with the rehabilitation pipe through a section, The lower end of the sleeve is exposed from the lower end of the rubber ring to the inside of the rehabilitating pipe, and the outer wall of the rubber ring is deformed in a build-up shape on the outer surface of the rehabilitating pipe while being in close contact with the inner peripheral surface of the outer sleeve. A rubber ring compression step, and a lower end of the inner sleeve is bent outwardly while a part of the rubber ring exposed inside the rehabilitation pipe is wound, and the inner sleeve is crimped to the rehabilitation pipe. Since it has a diameter expansion process and a pressure release process that releases the pressing force and forms a branching portion in the rehabilitation pipe, it is possible to branch relatively easily, but between the main pipe and the rehabilitation pipe It is possible to provide a rehabilitating pipe branching method capable of preventing water leakage and water leakage when a neck is perforated or a crack occurs.

Moreover, according to the branch part structure of the rehabilitation pipe according to claim 2, the rehabilitation pipe disposed in the pipeline of the main pipe inside the branch pipe provided with the main pipe and a branch pipe branched from the main pipe. A branch part structure to the branch pipe side, a perforated part drilled in the rehabilitated pipe, a cylindrical rubber ring attached to the perforated part and having a lower end entered into the rehabilitated pipe, An outer sleeve mounted between the inner peripheral surface of the branch pipe and the outer peripheral surface of the rubber ring, and a flange that directly or indirectly presses the upper end of the rubber ring, And a lower end of the inner sleeve is bent in a state of turning outward while winding a part of a rubber ring that has entered the inside of the rehabilitation pipe, and The sleeve is swaged and the rubber ring is fastened to the flange portion of the interior sleeve and the swaged Of the rehabilitating pipe, and the rehabilitating pipe inner build-up part formed by compression of the rubber ring and the rehabilitation pipe outer build-up part formed by compression of the rubber ring. Relatively simple because the perforated rim water stop part that sandwiches the tube wall and the inter-sleeve water stop part that is formed by adhering a rubber ring between the outer sleeve and the inner sleeve are formed. Even though it is a simple structure, it is possible to provide a branched structure of a rehabilitating pipe that can prevent water leakage between the main pipe and the rehabilitating pipe and water leakage when the neck is perforated or a crack occurs.

  According to the branch structure of the rehabilitating pipe according to claim 3, the upper end of the outer sleeve is provided with a hook-like locking part that contacts the branch pipe side flange formed at the opening end of the branch pipe. Therefore, the outer sleeve can be fixed in the branch pipe.

  Further, according to the branch structure of the rehabilitating pipe according to the present invention, the lower part of the outer sleeve is expanded along the inner wall of the neck of the branch pipe due to the deformation accompanying the compression of the rubber ring. As a smooth surface while protecting the inner wall surface of the neck, the stability of the branch structure can be enhanced.

  Moreover, according to the branch part structure of the rehabilitation pipe according to claim 5, the branch pipe includes a branch pipe side flange formed at an opening end of the branch pipe, and a connecting member connected to the branch pipe. The provided connecting member side flange is connected, and the interior sleeve includes a protruding portion protruding from an end surface of the branch pipe side flange, and between the branch pipe side flange and the connection member side flange, A separation preventing plate having a hole having a diameter larger than the outer diameter of the inner sleeve and smaller than the inner diameter of the branch pipe is interposed, and the protruding portion is positioned above the separation prevention plate at the position above the separation prevention plate. Since it has been decided that there is a separation locking part formed with an outer diameter larger than the diameter of the hole part of the separation prevention plate, even if the neck part breaks, the liquid fluid leaks from the broken part. It can be prevented as much as possible.

It is explanatory drawing which shows the branch pipe arrange | positioned at the branch part of water supply piping. It is explanatory drawing which showed the state of the branch pipe vicinity in the drilling process. It is explanatory drawing which showed the structure of the rubber ring. It is explanatory drawing which showed the state of the branch pipe vicinity in the rubber ring mounting | wearing process. It is explanatory drawing which showed the structure of the exterior sleeve. It is explanatory drawing which showed the structure of the interior sleeve. It is explanatory drawing which showed the state of the branch pipe vicinity in the sleeve insertion process. It is explanatory drawing which showed the state of the branch pipe vicinity in the sleeve insertion process. It is explanatory drawing which showed the state of the branch pipe vicinity in the rubber ring compression process. It is explanatory drawing which showed the state of the branch pipe vicinity in a diameter expansion process. FIG. 5 is an explanatory diagram showing a configuration of a branching section A It is explanatory drawing which showed the state of the branch pipe vicinity of the branch pipe deteriorated over time. It is explanatory drawing which showed the structure of the rubber ring and sleeve which are used in a 1st modification. It is explanatory drawing which showed the state of the branch pipe vicinity in the sleeve insertion process in a 1st modification. It is explanatory drawing which showed the state of the branch pipe vicinity in the sleeve insertion process in a 1st modification. It is explanatory drawing which showed the state of the branch pipe vicinity in the rubber ring compression process in a 1st modification. It is explanatory drawing which showed the structure of the branch part B in a 1st modification. It is explanatory drawing which showed the structure of the branch part C in a 2nd modification. It is explanatory drawing which showed the structure of the interior sleeve used in a 2nd modification. It is explanatory drawing which showed the structure of the separation prevention plate used in the 2nd modification. It is explanatory drawing which showed the structure of the separation prevention plate used in the 2nd modification. It is explanatory drawing which showed the modification of the rubber ring.

  The present invention provides a method for branching a rehabilitating pipe disposed in a pipe line of the main pipe to the side of the branch pipe inside a branch pipe having a main pipe and a branch pipe branched from the main pipe. is there.

  In particular, in the branching method of the rehabilitation pipe according to the present embodiment, a rehabilitation pipe drilling step of drilling the rehabilitation pipe by inserting a drill blade from the branch pipe, and a cylindrical rubber in the perforated part formed in the rehabilitation pipe A rubber wheel mounting step in which a ring is mounted and the lower end of the rubber ring is exposed inside the rehabilitation pipe, and an exterior mounted between the inner peripheral surface of the branch pipe and the outer peripheral surface of the rubber ring A sleeve insertion step of inserting a sleeve and an internal sleeve provided with a collar portion capable of directly or indirectly pressing the upper end of the rubber ring and mounted in a cylindrical shape of the rubber ring; and a pressing force applied to the internal sleeve And compressing the rubber ring with the rehabilitating pipe through the flange, thereby exposing the lower end of the interior sleeve from the lower end of the rubber ring to the inside of the rehabilitating pipe. The peripheral wall is brought into close contact with the inner peripheral surface of the outer sleeve. A rubber ring compression process in which the outer surface of the rehabilitating pipe is deformed in a surfacing manner, and a lower end of the inner sleeve is bent outwardly while a part of the rubber ring exposed inside the rehabilitating pipe is wound. And a diameter expanding step for crimping the inner sleeve to the rehabilitating pipe, and a pressure releasing step for releasing the pressing force and forming a branch portion in the rehabilitating pipe.

  Further, the present invention provides a structure for branching the rehabilitation pipe disposed in the pipe of the main pipe toward the branch pipe inside the branch pipe having a main pipe and a branch pipe branched from the main pipe. But there is.

  In particular, in the branched structure of the rehabilitating pipe according to the present embodiment, a perforated part drilled in the rehabilitated pipe, and a cylindrical rubber ring attached to the perforated part and having a lower end entered into the rehabilitated pipe. A cylindrical shape of the rubber ring having an exterior sleeve mounted between the inner peripheral surface of the branch pipe and the outer peripheral surface of the rubber ring, and a flange portion that directly or indirectly presses the upper end of the rubber ring. An inner sleeve mounted inside, and the lower end of the inner sleeve is bent in a state of turning outward while winding a part of the rubber ring that has entered the inside of the rehabilitation pipe. The inner sleeve is swaged and the rubber ring is held in a compressed state between the collar portion of the inner sleeve and the swaged stopper, and the rehabilitation pipe is built up by the rubber ring formed by the swaged stopper. Formed by compression of the part and the rubber ring A perforated peripheral water stop portion formed by sandwiching the tube wall of the rehabilitated pipe with a live tube outer cladding portion, and an inter-sleeve water stop portion formed by closely adhering a rubber ring between the outer sleeve and the inner sleeve. Is formed.

  And by using such a branching method or branching part structure, it is relatively easy to prevent water leakage between the main pipe and the rehabilitation pipe and water leakage when the neck is pierced or a crack occurs. it can.

  Hereinafter, the branching method of the rehabilitation pipe and the branching part structure of the rehabilitation pipe according to this embodiment will be described with reference to the drawings and following the construction procedure. In the following, a case where the pipe is a water pipe will be described as an example, but the present invention is not limited to this. Further, in this embodiment, an example is shown in which water as a liquid fluid flowing through the main pipe is flowed to the branch pipe side, but the case where the liquid fluid is allowed to flow (merge) from the branch pipe to the main pipe side is also included in the concept of the present invention. Needless to say.

  FIG. 1 is an explanatory view showing a branch pipe 12 arranged in a branch portion 11 of a water pipe 10. The branch pipe 12 includes a main pipe 13 extending in the left-right direction in the drawing, and a branch pipe 14 extending upward from the main pipe 13.

  The branch pipe 14 is formed with a flange (hereinafter referred to as a branch pipe side flange 16) at the periphery of the connection end opening 15 provided at the upper connection side end in the figure. For example, a connection such as a fire hydrant or an extension pipe is provided. By connecting the connecting member side flanges 18 provided in the member 17 so as to face each other, water can flow between the main pipe 13 and the connecting member 17 via the branch pipe 14. In the state shown in FIG. 1, the connecting member 17 is a fire hydrant 17a that is supplied with water from the main pipe 13 via the branch pipe 14, and is used for fire extinguishing. The main part of the fire hydrant 17a is omitted. ing. Reference numerals 16 a and 16 b denote connection bolts and nuts for attaching the connection member 17 to the branch pipe 14.

  The branch pipe 14 is connected to the wall portion of the main pipe 13 (hereinafter referred to as the main pipe wall portion 19) at a substantially right angle in the extending direction of the main pipe 13 while expanding in a trumpet shape with both an inner diameter and an outer diameter. A branch portion (merging portion) of the flow path of the connected main pipe 13 (hereinafter referred to as the main pipe flow path 13a) and the flow path of the branch pipe 14 (hereinafter referred to as the branch pipe flow path 14a). And a connection opening 20 for circulating water between the main pipe 13 and the main pipe 13. In the following description, the wall portion of the branch pipe 14 extending with a certain diameter is referred to as a branch pipe wall portion 21, and the trumpet-shaped wall portion connected from the branch pipe wall portion 21 to the main pipe wall portion 19 is the neck portion 22. Called.

  The main pipe flow path 13a is provided with a rehabilitation pipe 23 for repairing an aging pipe. Water is formed in the rehabilitation pipe 23 (hereinafter referred to as a rehabilitation pipe flow path 23a). )).

  In the state shown in FIG. 1, since the connection opening 20 is closed by the rehabilitation pipe 23 laid in the main pipe flow path 13a, the water flowing through the rehabilitation pipe flow path 23a is supplied to the branch pipe 14 side. It cannot be shunted.

  Therefore, first, in the branching method according to the present embodiment, a drill blade is inserted from the branch pipe 14 and drilled from the outer surface side of the rehabilitated pipe 23 (rehabilitated pipe drilling step).

  Specifically, the connecting bolt 16a and the nut 16b are loosened to remove the fire hydrant 17a connected to the branch pipe side flange 16, and the branch pipe side flange 16 is provided with a connecting member side flange 18 as shown in FIG. The drill device 17b as the connecting member 17 is connected.

  The drill device 17b includes a drill shaft 24a linked to a motor (not shown). The drill shaft 24a is configured to be rotatable around the axis in the branch pipe flow path 14a and to be movable up and down in the axial direction. Yes.

  Further, below the drill shaft 24a, a drill blade 24b having an outer diameter slightly smaller than the inner diameter of the branch pipe 14 and having a plurality of cutting edges 24c formed at the lower edge is coaxially disposed. The cutting edge 24c of the drill blade 24b is rotated by driving the motor to rotate the drill shaft 24a. Reference numeral 24 d is a tip drill for performing centering when drilling the rehabilitation pipe 23.

  Then, by lowering the drill shaft 24a while rotating, the tip drill 24d penetrates the tube wall of the rehabilitated tube 23, and then the drill blade 24b is brought into contact with the tube wall of the rehabilitated tube 23, as shown in FIG. Then, the perforated portion 25 is formed in the rehabilitation tube 23.

  Next, the drill device 17 b is removed from the branch pipe side flange 16 of the branch pipe 14, the cylindrical rubber ring 26 is advanced from the connection end opening 15, and the rubber ring 26 is attached to the perforated portion 25 formed in the rehabilitated pipe 23. Then, a rubber wheel mounting step is performed in which the lower end of the rubber ring 26 is exposed inside the rehabilitation pipe 23.

  FIG. 3 is a sectional view of the rubber ring 26 in the axial direction. As described above, the rubber ring 26 has a substantially cylindrical shape. From the upper end portion 27 to the lower end portion 28, the outer peripheral surface of the rubber ring 26 is a rubber ring outer peripheral surface portion 29, and the inner peripheral surface is rubber. The inner peripheral surface portion 30 is used.

  The outer peripheral surface portion 29 of the rubber ring is formed with an outer sleeve mounting portion 29a, a build-up portion 29b, and a perforated portion mounting portion 29c in order while providing steps from the upper end portion 27 to the lower end portion 28, respectively.

  The outer sleeve mounting portion 29a is a portion to which an outer sleeve 32 to be described later is mounted, and the outer diameter of the rubber ring 26 in the outer sleeve mounting portion 29a is substantially the same as the inner diameter of the outer sleeve 32 or can be mounted. The diameter of the outer sleeve is such that the outer sleeve mounting portion 29a is pressed against the inner peripheral surface of the outer sleeve 32 when the rubber ring 26 is compressed in the axial direction with the outer sleeve 32 mounted.

  The build-up formation part 29b is a part for forming a rehabilitation pipe outer build-up part 39, which will be described later, when the rubber ring 26 is compressed in the axial direction. The diameter is set to be larger than the diameter of the perforated part 25 so that the perforated part 25 is not inserted by the above-described compression. Further, the wall thickness of the rubber ring 26 in the build-up forming portion 29b is set to a thickness that allows the rehabilitation tube outer build-up portion 39 to be formed by compression.

  The perforated part mounting part 29c is a part for exposing the lower end part 28 inside the rehabilitation tube 23 while being mounted on the perforated part 25. The outer diameter of the perforated part mounting part 29c is the same as the diameter of the perforated part 25. The pierced portion mounting portion 29c is pierced by a compressive force when the rehabilitation tube outer build-up portion 39 and the rehabilitation tube inner build-up portion 43 described later are formed. The diameter is crimped to the inner peripheral surface of the portion 25.

  Further, a locking step portion 29d is formed between the build-up forming portion 29b and the perforated portion mounting portion 29c due to the difference in diameter between the two, and this locking step portion 29d is applied to the periphery of the perforated portion 25. By making contact, the rubber ring 26 is prevented from falling into the rehabilitation pipe 23.

  On the other hand, the rubber ring inner peripheral surface portion 30 includes an upper inner peripheral surface portion 30a, a reduced diameter tapered portion 30b, a lower inner peripheral surface portion 30c, and a convex inner peripheral surface portion 30d from the upper end portion 27 to the lower end portion 28. .

  The upper inner peripheral surface portion 30a is a part for mounting an interior sleeve 33 to be described later, and the inner diameter thereof is approximately the same as the outer diameter of the interior sleeve 33 or a diameter having a play so that the interior sleeve 33 can be mounted. Thus, when the rubber ring 26 is compressed in a state where the inner sleeve 33 is mounted, the diameter is set such that the upper inner peripheral surface portion 30a can be crimped to the outer surface of the inner sleeve 33.

  The diameter-reduced taper portion 30b is a portion for smoothly guiding the tip of the interior sleeve 33 to the lower inner peripheral surface portion 30c described below, and extends downward from the inner diameter of the upper inner peripheral surface portion 30a to the lower inner peripheral surface portion 30c. The taper shape is gradually reduced to the inner diameter. Further, the reduced diameter taper portion 30b is formed at the position of the inner peripheral surface portion 30 of the rubber ring corresponding to the substantially central portion in the vertical direction of the build-up forming portion 29b.

  The lower inner peripheral surface portion 30c is a portion for expanding and deforming the rubber ring 26 radially outward by inserting the interior sleeve 33. Specifically, by inserting the interior sleeve 33 into the lower inner peripheral surface portion 30c, the thick portion 29e of the build-up forming portion 29b is bulged outward in the radial direction, and a rehabilitation pipe outer build-up portion 39 described later. In addition, the engaging stepped portion 29d is similarly positioned radially outward to prevent the rubber ring 26 from falling into the rehabilitation pipe 23. Further, since the inner sleeve 33 functions like a wedge, the perforated portion mounting portion 29c also swells radially outward in a state where the rubber ring 26 is mounted on the perforated portion 25, and the rubber ring 26 in the perforated portion 25 is in contact with the rubber ring 26. It is possible to reliably prevent the rubber ring 26 from dropping from the perforated portion 25 while sufficiently filling the gap to prevent water leakage.

  The convex inner peripheral surface portion 30d is a part constituted by the lower end of the lower inner peripheral surface portion 30c, that is, the inner peripheral surface of the annular convex portion 31 provided at the position of the lower end portion 28 of the rubber ring 26. By inserting the interior sleeve 33 into the internal space of the rubber ring 26 while being attached to the perforated portion 25, the annular protrusion 31 is reversed outwardly in the rehabilitation pipe 23, and a crimping stop 41 to be described later is formed. By doing so, the rehabilitation pipe internal build-up part 43 is formed.

  In the rubber wheel mounting step, as shown in FIG. 4, the rubber ring 26 having the above-described configuration is inserted from the connection end opening 15 of the branch pipe 14, and the peripheral portion of the perforated part 25 is the rubber ring 26. It pushes in until it hits to the latching level | step-difference part 29d, and it is set as the state which exposed the lower end part 28 of the rubber ring 26 inside the renovated pipe | tube 23. FIG.

  After such a state, in the branching method according to the present embodiment, next, a sleeve insertion step of inserting the outer sleeve 32 and the inner sleeve 33 into the branch pipe channel 14a is performed.

  FIG. 5 shows a cross-sectional view of the outer sleeve 32 used in the sleeve insertion step, and FIG. 6 shows a plan view and a cross-sectional view of the inner sleeve 33. As shown in FIG. 5, the outer sleeve 32 includes a cylindrical outer cylindrical body 32a extending in the vertical direction, and a hook-shaped locking portion 32b formed radially outward at the upper end of the outer cylindrical body 32a. And. Although the material which renovates the exterior sleeve 32 is not specifically limited, For example, in this embodiment, it forms with resin.

  The outer cylindrical body 32a is a cylindrical portion having an outer diameter substantially the same as the inner diameter of the branch pipe 14, and plays a role of protecting the inner wall surface of the branch pipe 14 by being attached to the branch pipe flow path 14a. It is. Further, the lower part of the outer cylindrical body 32a is attached to a gap portion formed between the outer sleeve attaching part 29a of the above-described rubber ring 26 attached to the perforated part 25 and the inner wall surface of the branch pipe 14. It becomes.

  The hook-shaped locking part 32 b is a part for restricting the movement of the outer tubular body 32 a toward the connection opening 20, and from the inner diameter of the branch pipe 14 so as to be locked to the surface of the branch pipe side flange 16. Also has a large diameter.

  Further, the length from the upper end of the outer sleeve 32 provided with the hook-shaped locking portion 32b to the lower end of the outer sleeve 32 is from the upper surface of the branch pipe side flange 16 (the surface when packing, washer, etc. are interposed). The length of the free-length rubber ring 26 attached to the perforated part 25 is substantially the same as the length to the step portion between the outer sleeve attaching part 29a and the build-up forming part 29b.

  Similarly to the outer sleeve 32, the inner sleeve 33 is also a substantially cylindrical member as shown in FIG. 6, and has a cylindrical inner cylindrical body 33a extending in the vertical direction and a radially outer portion at the upper end of the inner cylindrical body 33a. And a flange 33b formed toward the direction. The material for rehabilitating the inner sleeve 33 is not particularly limited as long as the lower end portion is bent in a turned state (described later) and can be plastically deformed. For example, in the present embodiment, the whole is formed of metal. ing.

  The inner cylindrical body 33a is a cylindrical portion having an outer diameter that is substantially the same as the inner diameter of the upper inner peripheral surface portion 30a of the rubber ring 26 described above, and water branched from the main pipe 13 (rehabilitation pipe 23). It plays the role of forming a flow path leading to the side.

  Moreover, the lower part of the interior cylindrical body 33a is also a part that constitutes a caulking stop by a diameter expansion process that will be described in detail later.

  Further, as described above, the inner cylindrical body 33a is inserted through the rubber ring inner peripheral surface portion 30 of the rubber ring 26, thereby causing the thick portion 29e of the build-up forming portion 29b to bulge outward in the radial direction, In addition to facilitating the formation of the rehabilitation pipe outer build-up part, the locking step part 29d is similarly positioned radially outward to prevent the rubber ring 26 from falling into the rehabilitation pipe 23, and the perforated part 25 It also has a role of preventing water leakage by sufficiently filling the gap between the rubber ring 26 and the rubber ring 26.

  The flange portion 33b is a portion for contacting the upper end portion 27 of the rubber ring 26 when the interior sleeve 33 is inserted through the rubber ring 26, and the rubber ring 26 compressed in the rubber ring compression process described later. Is held while maintaining a state of having an elastic force between the caulking stopper formed at the lower end of the interior cylindrical body 33a and the flange portion 33b. Reference numeral 33c in FIG. 6 prevents the inner sleeve 33 from rotating with respect to the rubber ring 26 by being engaged with the jig when a caulking stopper is formed using a predetermined jig in the diameter expansion process described later. It is a notch for doing.

  In the sleeve insertion process, the exterior sleeve 32 and the interior sleeve 33 are inserted into the branch pipe 14.

  Specifically, as shown in FIG. 7, the exterior sleeve 32 is inserted into the branch pipe 14, the hook-shaped locking portion 32 b is brought into contact with the surface of the branch pipe side flange 16, and the exterior cylindrical body 32 a is The lower end is inserted into the gap formed between the outer sleeve mounting portion 29a and the inner wall of the branch pipe 14 until it reaches the vicinity of the step formed between the outer sleeve mounting portion 29a and the build-up forming portion 29b. To do.

  Next, the internal sleeve 33 equipped with the packing 34 for improving the water-stopping property is inserted into the branch pipe 14. FIG. 7 shows a state in which the internal sleeve 33 is inserted up to the front of the reduced diameter taper portion 30b of the rubber ring 26. The packing 34 is an annular packing 34 having an outer diameter that is substantially the same as the inner diameter of the outer sleeve 32 and an inner diameter that is substantially the same as the outer diameter of the inner sleeve.

  When the inner sleeve 33 is further advanced, it is smoothly guided to the lower inner peripheral surface portion 30c by the reduced diameter taper portion 30b, and the flange portion 33b is connected to the upper end portion 27 of the rubber ring 26 via the packing 34 as shown in FIG. (Indirectly) is inserted to the position of pressing. In the present embodiment, the flange portion 33b is brought into contact with the upper end portion 27 via the packing 34. However, the packing 34 may be omitted or a plurality of members such as packings 34 and washers may be interposed. Needless to say. In the present specification, the expression “an heel that can directly or indirectly press the upper end of the rubber ring” includes the above-described embodiment.

  In such a state in FIG. 8, the thick portion 29e of the build-up forming portion 29b bulges outward in the radial direction by the mounted internal sleeve 33. Further, the engaging stepped portion 29d is expanded radially outward to prevent the rubber ring 26 from falling into the rehabilitating pipe 23, and the gap between the perforated portion 25 and the rubber ring 26 is filled to cause water leakage. It is in a prevented state. In the present embodiment, the rubber wheel mounting step and the sleeve insertion step described above are sequentially performed. However, either or both of the outer sleeve 32 and the inner sleeve 33 are mounted on the rubber ring 26 and the sleeve mounting rubber wheel is mounted. By inserting this into the branch pipe 14 (perforated portion 25), part or all of the rubber wheel mounting step and the sleeve insertion step may be performed simultaneously. When forming the sleeve mounting rubber ring, the inner sleeve 33 is attached to the rubber ring 26 by placing the inner sleeve 33 in a state where the inner sleeve 33 is inserted shallowly above the reduced diameter tapered portion 30b of the rubber ring 26. The rubber ring 26 having no diameter can be formed and can be easily inserted into the branch pipe 14 or the perforated portion 25.

  In a state where the interior sleeve 33 is pushed in in this manner, a rubber wheel compression process is performed in which a pressure is applied to the interior sleeve 33 to compress the rubber ring 26. FIG. 9 is an explanatory view showing a state during the rubber ring compression process.

  Here, by attaching a diameter expansion jig 17c as the connecting member 17 to the branch pipe side flange 16, a rubber ring compression process and a diameter expansion process described later are performed. First, the configuration of the diameter expansion jig 17c is described. Briefly described. The specific structure of the diameter expansion jig 17c is detailed in Japanese Patent Application No. 2013-072200 filed earlier by the present applicant. However, in performing the rubber ring compression process and the diameter expansion process, it is not always necessary to use the diameter expansion jig 17c, and the jig is not particularly limited as long as the same operation can be performed. is there.

  The diameter expansion jig 17c used in the branching method according to the present embodiment compresses the rubber ring 26 or bends the lower part of the inner sleeve 33 outwardly in the rehabilitation pipe 23 so as to prevent the caulking. This is a jig for forming a stem 35 having a main shaft and a sub shaft (not shown).

  The stem 35 is formed to have a smaller diameter than the inner diameter of the branch pipe 14, the inner diameter of the outer sleeve 32, and the inner diameter of the inner sleeve 33, and the lower portion of the stem 35 can be exposed in the rehabilitation pipe 23 through these. It is composed.

  In addition, an annular pressing body 36 is provided in the middle portion of the stem 35. The annular pressing body 36 is formed so that the diameter of the stem 35 is increased outward in the radial direction. The annular pressing body 36 is a portion for compressing the rubber ring 26 via the flange portion 33b of the inner sleeve 33, and has a diameter smaller than the inner diameter of the outer sleeve 32 and larger than the inner diameter of the inner sleeve 33. When the stem 35 is inserted, it is configured to abut against the flange 33b.

  In addition, a lower portion of the stem 35 is provided with a diameter increasing portion 37 for forming a crimping stop 41 in a diameter expanding step described later. The diameter-expanded portion 37 is configured to be rotatable and fixed around the axis of the auxiliary axis 38b shown by a one-dot chain line in FIG. 7 with respect to the stem 35, and to be movable up and down in the direction of the auxiliary axis 38b.

  Further, the stem 35 itself can also rotate around the axis of the main axis 38a indicated by a one-dot chain line in FIG. 7 with respect to the diameter expansion jig 17c fixed to the branch pipe side flange 16, and the direction of the main axis 38a It can be lifted and fixed.

  In this rubber ring compression step, the stem 35 is advanced into the branch pipe 14 with the connecting member side flange 18 of the diameter expansion jig 17c attached and fixed to the branch pipe side flange 16, and the annular pressing body 36 is moved to the flange 33b. Abut.

  By further pushing the stem 35 in this state, a pressing force is applied to the flange portion 33b of the internal sleeve 33, and the rubber ring 26 is connected to the outer wall surface of the rehabilitation pipe 23 via the flange portion 33b (and packing 34). Compress.

  Along with this, the lower end of the interior sleeve 33 is exposed from the lower end of the rubber ring 26 to the inside of the rehabilitation pipe 23, the annular convex portion 31 of the rubber ring 26 is reversed outward, and the thick portion 29e is further increased. The rehabilitation pipe outer build-up portion 39 is formed by being compressed and deformed into a build-up shape. The rehabilitation pipe outer build-up portion 39 plays a role of more firmly preventing water leakage around the perforation portion 25.

  Next, a diameter expansion step is performed while maintaining the compressed state of the rubber ring 26. FIG. 10 is an explanatory view showing a state during the diameter expansion process.

  In the diameter expansion step, the expanded diameter portion 37 provided at the lower portion of the stem 35 is maintained around the axis of the auxiliary axis 38b, for example, about 180 while the compressed state of the rubber ring 26 via the flange portion 33b by the annular pressing body 36 is maintained. The diameter expansion roller 40 disposed in the diameter expansion portion 37 is brought into a state in which the diameter expansion roller 40 can be brought into contact with the lower end portion of the interior sleeve 33. In the following description, such a state of the enlarged diameter portion 37 is referred to as a protruding state, and the state of the enlarged diameter portion 37 illustrated in FIG. 9 is referred to as a stored state.

  Next, while restricting the rotation of the auxiliary axis 38b in the direction around the axis while keeping the enlarged diameter portion 37 in the projecting state, the enlarged diameter portion 37 is arranged on the auxiliary axis with respect to the stem 35 as indicated by a broken line in FIG. The diameter-expanding roller 40 is brought into contact with the lower end of the interior sleeve 33 by pulling it upward in the axial direction of 38b.

  In this state, the stem 35 is attached to the main body of the diameter-enlarging jig 17c while applying a pulling force that can plastically deform the lower portion of the interior sleeve 33 by pulling the diameter-expanding portion 37 upward in the axial direction of the auxiliary axis 38b. A portion (not shown) is rotated around the axis of the main axis 38a.

  The enlarged diameter roller 40 is formed with a curved surface that bends the lower end portion of the inner sleeve 33 in a radially outward direction, and the lower end portion of the inner sleeve 33 is exposed to the rubber ring exposed in the rehabilitation pipe 23. 26 is expanded while entraining a part thereof, and a crimping stop 41 is formed (see FIG. 11). In other words, the inner sleeve 33 is compressed between the annular pressing body 36 and the diameter-expanding roller 40, and the lower end portion of the inner sleeve 33 is bent into a trumpet shape while a part of the rubber ring 26 is wound. Form.

  At the same time, a part of the rubber ring 26 wound by the caulking stopper 41 forms a rehabilitation tube built-up portion 43 at the periphery of the perforated portion 25 inside the rehabilitation tube 23. The rehabilitation pipe internal build-up part 43 and the above-described rehabilitation pipe external build-up part 39 are composed of a force from the outside of the rehabilitation pipe 23 due to the elastic force of the compressed rubber ring 26 (downward force in the figure), rubber A perforated peripheral water stop portion 44 that clamps the tube wall of the rehabilitated tube 23 with the upward force from the inside of the rehabilitated tube 23 received from the caulking stop 41 when the inner sleeve 33 tries to return upward due to the elastic force of the ring 26. Form.

  Further, between the outer sleeve 32 and the inner sleeve 33, the rubber ring 26 comes into close contact with both due to the deformation of the rubber ring 26, thereby forming the inter-sleeve water stop portion 45.

  Next, by removing the diameter expansion jig 17 c attached to the branch pipe side flange 16, a pressure releasing process for releasing the pressing force applied to the rubber ring 26 and forming the branch portion A in the rehabilitated pipe 23 is performed. Do.

  Specifically, the enlarged diameter portion 37 is moved from the position indicated by the broken line in FIG. 10 downward in the axial direction of the auxiliary axis 38b, that is, to the position indicated by the solid line, and then displaced from the protruding state to the retracted state.

  Then, by loosening the connecting bolt 16a and the nut 16b and removing the diameter expansion jig 17c from the branch pipe side flange 16, the stem 35 is pulled up from the branch pipe flow path 14a, and accordingly, the flange 33b by the annular pressing body 36 is interposed. The pressing force applied to the rubber ring 26 is released.

  By performing this pressure release process, a branching portion A is formed in the rehabilitation pipe 23 as shown in FIG. In the state shown in FIG. 11, although the pressing force applied to the rubber ring 26 by the annular pressing body 36 is released, the elastic force stored in the rubber ring 26 itself is still retained and is in a compressed state. is there.

  As described above, the branch portion A formed by the branching method according to the present embodiment is arranged in the pipe of the main pipe 13 inside the branch pipe 12 including the main pipe 13 and the branch pipe 14 branched from the main pipe 13. The rehabilitation pipe 23 has a branch part structure toward the branch pipe 14, and includes a perforation part 25 perforated in the rehabilitation pipe 23, and a lower end part attached to the perforation part 25. A cylindrical rubber ring 26 that has entered the interior, an outer sleeve 32 that is mounted between the inner peripheral surface of the branch pipe 14 and the outer peripheral surface of the rubber ring 26, and an upper end portion 27 of the rubber ring 26 An inner sleeve 33 having a flange portion 33b that is in contact with the inner sleeve 33 and mounted inside the rubber ring 26, and the lower end of the inner sleeve 33 is a part of the rubber ring 26 that has entered the rehabilitation pipe 23. The part is bent in a state of turning outward while winding the part, and the rehabilitation 23, and the rubber ring 26 is held in a compressed state between the flange 33b of the internal sleeve 33 and the crimping stop 41, and is formed by the crimping stop 41. Further, a perforated peripheral water stop portion 44 is formed by sandwiching the tube wall of the rehabilitated tube 23 with a rehabilitated tube inner build-up portion 43 by the rubber ring 26 and a rehabilitated tube outer build-up portion 39 formed by compression of the rubber ring 26. And an inter-sleeve water stop portion 45 formed by closely adhering a rubber ring 26 between the outer sleeve 32 and the inner sleeve 33.

  Therefore, water leakage between the main pipe 13 and the rehabilitation pipe 23 can be prevented steadily.

  Further, even if the neck portion 22 of the branch pipe 12 is perforated or cracked due to the further deterioration of the branch pipe 12 or the earthquake, water leakage from the neck portion 22 can be prevented.

  Further, according to the branching method according to the present embodiment, water leakage between the main pipe 13 and the rehabilitation pipe 23 or water leakage in the case where the neck portion 22 is pierced or a crack is generated can be branched relatively easily. The rehabilitation pipe 23 can be branched.

  In the present embodiment, when the outer sleeve 32 is attached to the rubber ring 26, the lower end portion of the outer cylindrical body 32a of the outer sleeve 32 is connected to the outer sleeve mounting portion 29a and the overlay forming portion 29b of the rubber ring 26. However, the present invention is not limited to this. For example, the inner peripheral lower portion of the outer cylindrical body 32a of the outer sleeve 32 is tapered so that the inner diameter expands downward, while the boundary between the outer sleeve mounting portion 29a and the overlay forming portion 29b of the rubber ring 26 is defined. A tapered shape (for example, a shape as shown in the rubber wheel outer peripheral surface tapered portion 52a in FIG. 13B) may be formed such that the diameter gradually increases downward at substantially the same angle as the tapered shape. With such a shape, the lower end portion of the outer sleeve 32 can be made flexible, and the lower end portion of the outer sleeve 32 can be deformed as the rubber ring 26 is compressed to protect the tube wall. it can.

  Next, a branching method and a branching part structure according to a modification will be described with reference to FIGS. FIG. 12 is an explanatory view showing a state of the branch pipe 12 to be constructed in the first modification. In the following description, the same reference numerals are given to the same configurations as the previous configurations, and description thereof is omitted.

  The branch pipe 12 to be constructed in the first modified example has a corrugated portion 50 formed by corrosion or deposits on the inner surface of the branch pipe wall portion 21 and the inner surface of the neck portion 22 due to deterioration over time due to long-term use.

  In the vicinity of the neck portion 22 having such a concavo-convex portion 50, it may be difficult to say that a sufficient water-stopping property can be ensured with the branch portion structure according to the previous embodiment.

  Therefore, in the first modified example, a branching portion structure and a branching method provided with a watertight portion 45 between sleeves having higher water tightness will be described.

  FIG. 13 is an explanatory view showing a cross section of a sleeve and a rubber ring used in the first modification. FIG. 13A shows the outer sleeve 51, FIG. 13B shows the rubber ring 52, and FIG. 13C shows the inner sleeve 33.

  The exterior sleeve 51 has substantially the same configuration as the exterior sleeve 32 described above, but an exterior cylinder taper portion 51c whose inner diameter gradually expands downward in the axial direction is formed at the lower part of the exterior cylinder body 51a. The length from the upper end of the outer sleeve 51 provided with the hook-shaped locking portion 32b to the lower end of the outer sleeve 51 is a free length from the upper surface of the branch pipe side flange 16 to the neck portion 22. The structure is such that the length until it is exposed to a neck inner space 53 surrounded by a rubber ring 52 and an outer wall of the rehabilitation tube 23, which is described later, more preferably substantially the same as the length until it abuts against the rehabilitation tube 23. It is different. The outer sleeve 51 is made of a resin having a slight stretchability and flexibility, particularly polyethylene in the first modification.

  The rubber ring 52 also has substantially the same configuration as the rubber ring 26 described above, but the outer diameter gradually increases downward between the outer sleeve mounting portion 29a and the build-up forming portion 29b. The structure is different in that the rubber ring outer peripheral surface taper portion 52a is formed.

  The interior sleeve 33 used in the first modification is the same as that described in the previous embodiment.

  Next, a branching method according to the first modification using the outer sleeve 51, the rubber ring 52, and the inner sleeve 33 will be described. FIG. 14 is an explanatory view showing a state of the sleeve insertion step according to the first modification. Note that the drilling step and the rubber wheel mounting step are the same as in the previous embodiment, and a description thereof will be omitted.

  As shown in FIG. 14, in the sleeve insertion step, the interior sleeve 33 is inserted into the branch pipe 14. FIG. 14 shows a state in which the interior sleeve 33 is inserted to the front of the reduced diameter taper portion 30b of the rubber ring 52.

  Next, the outer sleeve 51 is inserted into the branch pipe 14 (see FIG. 14), and as shown in FIG. 15, the hook-shaped locking part 32b is brought into contact with the surface of the branch pipe side flange 16, and the outer cylinder taper part 51c. Is inserted through a gap formed between the outer sleeve mounting portion 29a and the inner wall of the branch pipe 14 until it reaches a position exposed to the neck inner space 53 along the outer peripheral surface taper portion 52a of the rubber ring. .

  In the state where the interior sleeve 33 and the exterior sleeve 51 are thus inserted, the rubber ring compression step, the diameter expansion step, and the pressure release step are performed next. FIG. 16 is an explanatory view showing a state during the rubber wheel compression step, and FIG. 17 is an explanatory view showing a state after the pressure release step. In FIG. 16, the illustration of the diameter expansion jig 17c is omitted.

  As in the previous embodiment, with the connecting member side flange 18 of the diameter expansion jig 17c attached and fixed to the branch pipe side flange 16, the stem 35 is caused to enter the branch pipe 14, and the annular pressing body 36 is moved to the flange 33b. By pressing the stem 35 further, the pressing force is applied to the flange portion 33b of the internal sleeve 33, and the rubber ring 52 is compressed between the outer wall surface of the rehabilitating pipe 23 via the flange portion 33b.

  Accordingly, as shown in FIG. 16, the lower end of the interior sleeve 33 is exposed from the lower end of the rubber ring 52 to the inside of the rehabilitation pipe 23, and the annular convex portion 31 is inverted outward, and the thick portion 29e Is compressed and deformed into a build-up shape, and the rehabilitation tube outer build-up portion 54 is formed. In particular, the rubber ring 52 used in the first modified example has a length of at least half of the length from the inner wall surface side of the branch pipe wall portion 21 to the inner wall surface side of the main pipe wall portion 19. It has a degree of deformability such that it can be deformed along the wall surface, and more than half of the volume of the neck inner space 53 is filled with the deformed rubber ring 52, and is more overlay-like than the previous embodiment. The rehabilitation pipe outer build-up part 54 is formed.

  In addition, since the rehabilitation tube outer build-up portion 54 expands the lower portion of the outer tubular body 51a into a trumpet shape by the deformability of the rubber ring 52, the outer tubular body 51a reaches the inner wall surface of the neck portion 22. Will be covered.

  The rehabilitation pipe outer build-up portion 54 is also an inter-sleeve water stop portion 55 formed between the inner tubular body 33a of the inner sleeve 33 and the outer tubular body 51a of the outer sleeve 51. Since it has a thicker structure than the inter-sleeve water stop portion 45, extremely high water stop performance can be exhibited.

  In addition, the direct or indirect adhesion of the rubber ring 52 to the inner wall surface of the neck portion 22 is directly applied to the inner wall surface of the neck portion 22 beyond the region covered by the outer cylindrical body 51a in the downward skirt direction in which the neck portion 22 expands. Therefore, higher water tightness can be secured.

  In addition, since the outer cylinder taper portion 51c is provided at the boundary portion of the outer sleeve 51 at the close contact portion of the rubber ring 52 with the inner wall surface of the neck portion 22, the inner surface of the neck portion 22 and the inner wall surface of the outer sleeve 51 are smooth. Thus, the rubber ring 52 can be fitted, and high water tightness can be secured.

  Then, through the diameter expanding step and the pressure releasing step, as shown in FIG. 17, the branch portion B according to the first modified example is formed. This branch part B has a perforated peripheral water stop part 44 constituted by a rehabilitation pipe outer build-up part 54 and a rehabilitation pipe internal build-up part 43 which are thicker than the rehabilitation pipe outer build-up part 39 described above. Since it is formed, it is possible to provide a branch portion with higher water tightness.

  That is, in this branch portion B, in addition to the same structure as the branch portion structure provided in the previous branch portion A, the lower portion of the outer sleeve 51 is connected to the neck portion 22 of the branch pipe 14 by deformation accompanying the compression of the rubber ring 52. Because it has a branch structure that is expanded along the inner wall, it can improve the stability of the branch structure as a smooth surface while protecting the inner wall surface of the branch neck, and it has a higher water-tightness. It can be set as the branch part B provided with the water stop part 45. FIG.

  Further, according to the branching method according to the first modified example, it is possible to improve the stability of the structure of the branching portion as a smooth surface while protecting the inner wall surface of the branch pipe neck, and to prevent the sleeve between the sleeves having higher watertightness. A branch portion B including the water portion 45 can be formed.

  Next, a branching method and a branching part structure according to a second modification will be described with reference to FIGS. FIG. 18 is an explanatory view showing a branching portion C provided with a branching portion structure according to the second modification, that is, a diagram showing a state in which construction is completed.

  The above-described two branch portions A and B can effectively prevent water leakage even when the neck portion 22 is perforated or cracked.

  However, as shown by a two-dot chain line arrow in FIG. 18, when the neck portion 22 is broken due to an earthquake or the like, that is, when the neck 22 is cracked and broken around the entire circumference of the neck portion 22, the main tube 13 is divided. It is difficult to prevent water leakage.

  Therefore, in the second modification, a branching part structure and a branching method of the branching part C that can prevent water leakage as much as possible even when the neck part 22 is broken will be described.

  As shown in FIG. 18, the basic structure of the branch part C is the same as that of the branch part A. However, the shape of the interior sleeve 60 and the separation preventing plate between the branch pipe side flange 16 and the connecting member side flange 18 are the same. The structure is different in that 61 is interposed. In addition, although the branch part C which concerns on this 2nd modification is demonstrated here based on the branch part A, of course, you may add the branch part structure which the branch part B has.

  As shown in FIG. 19, the interior sleeve 60 includes an interior cylindrical body 33a and a flange portion 33b as in the case of the interior sleeve 33 described above, but extends the interior tubular body 33a further above the flange portion 33b. A cylindrical extension 60b is formed above the upper end surface of the branch pipe side flange 16 when the interior sleeve 60 is inserted at a fixed position in the branch pipe 14 at the upper part of the cylindrical extension 60b. A projecting portion 60c is provided to project.

  In addition, the protrusion 60c is formed with a detachment locking portion 60d in which the tube wall of the cylindrical extension 60b is formed thick in the radial direction outward. The diameter of the detachment locking portion 60d is smaller than the flow path diameter of the connecting member 17 and larger than the inner diameter of the contact portion 61a of the detachment prevention plate 61 described later.

  On the other hand, as shown in FIG. 20, the detachment prevention plate 61 is a plate-like member formed by drilling a hole 61c in the plate body 61b, and in the second modification example, has a donut shape in plan view.

  The hole 61c serves as an abutting portion 61a for preventing a part of the whole edge part from abutting against the detachment locking part 60d of the interior sleeve 60 to prevent the detachment. That is, the hole 61c is formed with an abutting portion 61a smaller than the outer diameter of the disengagement locking portion 60d of the internal sleeve 60, and as shown in FIG. 18, at the neck portion 22 indicated by a two-dot chain line arrow. Even if the branch pipe 14 and the connecting member 17 are moved upward with respect to the main pipe 13 due to breakage, the internal sleeve is fixed to the rehabilitation pipe 23 disposed in the main pipe 13 with a caulking stopper 41. Since the contact portion 61 a of the separation preventing plate 61 contacts the separation locking portion 60 d of 60, it is possible to prevent the broken branch pipe 14 from largely separating from the internal sleeve 60.

  Therefore, within the range in which the rubber ring 26 has an elastic force, the perforated peripheral water stop portion 44 and the inter-sleeve water stop portion 55 are continuously formed, so that water leakage can be prevented. In other words, the length d of the gap between the detachment locking portion 60d and the detachment prevention plate 61 includes the length from the locking step portion 29d to the upper end portion 27 of the compressed rubber ring 26, and the rubber ring when not compressed. By setting the length shorter than the difference from the length of the latching step 29d to the upper end 27, the compression force of the rubber ring 26 is maintained even when the neck is broken, and the perforated peripheral water stop 44 and the sleeve The water stop portion 55 can be kept effective and water leakage can be prevented.

  Since the diameter of the hole 61c of the separation preventing plate 61 is smaller than the outer diameter of the separation locking portion 60d of the inner sleeve 60, the separation preventing plate 61 is inserted through the inner sleeve 60 as shown in FIG. Several methods are conceivable to construct.

  FIG. 21 is an explanatory view showing the configuration of the separation preventing plate 61. For example, the separation preventing plate 61 shown in FIG. 21A is configured such that the separation preventing plate 61 is formed by combining two semicircular arc shaped plate divided bodies 62.

  Specifically, for example, in the same manner as the branching portion A, the connecting member 17 is attached to the branch pipe side flange 16 through a drilling process, a rubber wheel mounting process, a sleeve insertion process, a rubber wheel compression process, a diameter expansion process, and a pressure release process. When performing the above, the arcuate ends of the two plate divided bodies 62 are combined with each other so as to surround the cylindrical extension body 60b at a position below the protrusion 60c of the interior sleeve 60 and below the separation locking portion 60d. It may be installed with. In this case, the entire edge portion of the semicircular hole forming notch 63 formed in the plate divided body 62 functions as the contact portion 61a.

  Further, for example, as shown in FIG. 21 (b), a mounting notch 64 is provided at the edge of the hole 61c in the separation preventing plate 61 as in the bayonet lock structure, while the separation locking portion 60d in the interior sleeve 60 is provided. As a shape that can be inserted into the mounting notch 64, the separation preventing plate 61 may be inserted from the upper part of the interior sleeve 60.

  In this case, when the separation preventing plate 61 is fixed on the branch pipe side flange 16 (on the hook-shaped engagement portion 32b), it is detached and engaged with the edge portion of the hole portion 61c other than the mounting notch 64, that is, the plate body 61b. In the case of FIG. 21B, for example, in the case of FIG. 21B, the separation preventing plate 61 is inserted into the inner sleeve 60 and passed through the separation locking portion 60d. It is necessary to dispose at a position rotated about an axis of about 90 degrees.

  Thus, according to the branch part C according to the second modification, in addition to the same structure as the branch part structure provided in the previous branch part A, the branch pipe 14 has an opening end portion of the branch pipe 14. The connecting member side flange 18 provided in the connecting member 17 connected to the branch pipe 14 is connected to the formed branch pipe side flange 16, and the internal sleeve 60 is connected to the end face of the branch pipe side flange 16. A projecting portion 60c is provided, and a hole having a diameter larger than the outer diameter of the inner sleeve 60 and smaller than the inner diameter of the branch pipe 14 is provided between the branch pipe side flange 16 and the connecting member side flange 18. A separation preventing plate 61 provided with 61c is interposed, and is formed at a position higher than the separation preventing plate 61 of the protruding portion 60c with an outer diameter larger than the diameter of the hole 61c of the separation preventing plate 61. Detachment lock made Because having a bifurcation structure 60d is provided, even if the neck 22 is broken, it is possible as much as possible prevent water leakage.

  In addition, according to the branching method according to the second modification, even when the neck portion 22 is broken, the branch portion C that can prevent water leakage as much as possible can be formed.

  As described above, according to the branching method according to the present embodiment, a branch pipe (for example, a branch pipe) including a main pipe (for example, the main pipe 13) and a branch pipe (for example, the branch pipe 14) branched from the main pipe. 12) A branching method of a rehabilitating pipe (for example, rehabilitating pipe 23) disposed in the main pipe line to the side of the branch pipe, wherein a drill blade (for example, a drill blade) 24b) is inserted into the rehabilitated tube to pierce the rehabilitated tube, and a cylindrical rubber ring (for example, rubber ring 26, rubber ring 52) is formed in the perforated part (for example, perforated part 25) formed in the rehabilitated pipe. ) And a rubber ring mounting step in which the lower end of the rubber ring is exposed inside the rehabilitation pipe, and an exterior mounted between the inner peripheral surface of the branch pipe and the outer peripheral surface of the rubber ring Sleeve (for example, exterior sleeve 32, exterior sleeve 51) and the rubber ring An interior sleeve (for example, interior sleeve 33, interior sleeve 60) that includes a collar portion (for example, collar portion 33b) that can directly or indirectly press the upper end and that is mounted inside the cylindrical shape of the rubber ring is inserted. A sleeve insertion step, and applying a pressing force to the interior sleeve and compressing the rubber ring between the rehabilitation pipe and the rehabilitation pipe via the flange portion, so that the lower end of the internal sleeve is moved from the lower end of the rubber ring. A rubber ring compression step in which the outer wall of the rubber ring is exposed to the inside surface of the outer sleeve and the outer surface of the outer sleeve is in close contact with the inner surface of the outer sleeve, and is exposed to the inside of the rehabilitation pipe. A diameter expanding step of folding the inner sleeve to the rehabilitating pipe by crimping the inner sleeve to the rehabilitating pipe by bending the lower end of the inner sleeve outward while winding a part of the rubber ring that has been wound, The pressure release step of releasing the pressing force and forming a branching portion in the rehabilitation pipe, so that it is possible to branch relatively easily, water leakage between the main pipe and the rehabilitation pipe, It is possible to provide a method for branching a rehabilitation pipe that can prevent water leakage in the case of drilling or cracking.

  Moreover, according to the branch part structure according to the present embodiment, the branch pipe (for example, the branch pipe 12) including the main pipe (for example, the main pipe 13) and the branch pipe (for example, the branch pipe 14) branched from the main pipe. Inside, a branching portion structure of the rehabilitation pipe (for example, the rehabilitation pipe 23) disposed in the pipe of the main pipe to the branch pipe side, and a perforation part (for example, a perforation part) drilled in the rehabilitation pipe 25), a cylindrical rubber ring (for example, rubber ring 26, rubber ring 52) that is attached to the perforated portion and has a lower end inserted into the rehabilitation pipe, an inner peripheral surface of the branch pipe, and the rubber ring An outer sleeve (for example, the outer sleeve 32 and the outer sleeve 51) mounted between the outer peripheral surface and a flange portion (for example, the flange portion 33b) that directly or indirectly presses the upper end of the rubber ring. An interior sleeve (for example, an interior sleeve) mounted inside the cylindrical shape of the rubber ring. 33, an inner sleeve 60), and the lower end of the inner sleeve is bent in a state of turning outward while winding a part of the rubber ring that has entered the inside of the rehabilitation pipe. The inner sleeve is swaged (for example, swaged 41), and the rubber ring is held in a compressed state between the collar portion of the inner sleeve and the swaged stopper, and is formed by the swaged stopper. Rehabilitation pipe internal build-up part (for example, rehabilitation pipe internal build-up part 43) and a rehabilitation pipe external build-up part (for example, rehabilitation pipe external build-up part 39, rehabilitation pipe external build-up) formed by compression of the rubber ring. Between the outer peripheral sleeve and the inner sleeve, and a perforated peripheral water stop portion (for example, a perforated peripheral water stop portion 44) that sandwiches the wall of the rehabilitated pipe with the portion 54). The water stop between sleeves (for example, The sleeve water-stopping portion 45 and the sleeve water-stopping portion 55) are formed, so that the water leakage between the main pipe and the rehabilitation pipe or the neck is perforated while having a relatively simple structure. It is possible to provide a rehabilitating pipe branching structure that can prevent water leakage when a crack occurs.

  Finally, the description of each embodiment described above is an example of the present invention, and the present invention is not limited to the above-described embodiment. For this reason, it is a matter of course that various modifications can be made in accordance with the design and the like as long as they do not depart from the technical idea according to the present invention other than the embodiments described above.

  For example, the diameter-reduced taper portion 30b of the rubber ring 52 used in each embodiment or modification is formed at the position of the rubber ring inner peripheral surface portion 30 corresponding to the substantially central portion in the vertical direction of the build-up portion 29b. However, the present invention is not limited to this.

  Like the rubber ring 70 shown in FIG. 22, the formation position of the reduced diameter taper portion 30b is the same as the position of the rubber ring inner peripheral surface portion 30 corresponding to the lower portion of the buildup forming portion 29b, in other words, the upper inner peripheral surface portion 30a. The boundary between the reduced diameter taper portion 30b is the position of the rubber ring inner peripheral surface portion 30 corresponding to the lower portion of the build-up portion 29b, and the boundary between the reduced diameter taper portion 30b and the lower inner peripheral surface portion 30c is the locking step portion. The position of the inner peripheral surface portion 30 of the rubber ring substantially corresponding to 29d may be used.

  According to the rubber ring 70 in which the diameter-reduced taper portion 30b is formed at such a position, it is possible to further prevent the rubber ring 70 from falling into the rehabilitation pipe 23 when the interior sleeves 33 and 60 are mounted.

  That is, when the internal sleeve 33 and the internal sleeve 60 are inserted through the rubber ring 26 shown in FIG. 3 and the rubber ring 52 shown in FIG. 13B, the lower ends of the internal sleeves 33 and 60 are reduced diameter tapered portions 30b. When passing, the engaging stepped portion 29d does not bulge outward in the radial direction, and a strong frictional force acts between the rubber ring 70 and the rubber ring 70 falls into the rehabilitation pipe 23. Although it tends to occur, according to the rubber ring 70, the engaging stepped portion 29 d expands radially outward almost simultaneously with the lower end of the interior sleeves 33, 60 reaching the reduced diameter tapered portion 30 b. In addition, the rubber ring 70 is effectively prevented from falling into the rehabilitation pipe 23.

DESCRIPTION OF SYMBOLS 12 Branch pipe 13 Main pipe 14 Branch pipe 15 Connection end opening 16 Branch pipe side flange 17 Connection member 20 Connection opening 22 Neck part 23 Rehabilitation pipe 24b Drill blade 25 Perforation part 26 Rubber ring 27 Upper end part 28 Lower end part 32 Exterior sleeve 32b Saddle-like engagement Stop part 33 Internal sleeve 33b collar part 36 annular pressing body 37 enlarged diameter part 39 rehabilitation pipe outer build-up part 41 caulking stop 43 rehabilitation pipe internal build-up part 44 perforated peripheral water stop part 45 inter-sleeve water stop part 51 outer sleeve 52 rubber ring 54 Rehabilitation pipe outer build-up part 55 Inter-sleeve water stop part 60 Internal sleeve 60c Protruding part 60d Detachment locking part 61 Detachment prevention plate A Branch part B Branch part C Branch part

Claims (5)

In the branch pipe comprising a main pipe and a branch pipe branched from the main pipe, a branching method to the branch pipe side of the rehabilitation pipe disposed in the pipe of the main pipe,
Rehabilitation pipe drilling step of drilling the rehabilitation pipe by inserting a drill blade from the branch pipe;
A rubber wheel mounting step in which a cylindrical rubber ring is mounted on the perforated part formed in the rehabilitation pipe, and a lower end of the rubber ring is exposed inside the rehabilitation pipe;
A cylindrical interior of the rubber ring, comprising an outer sleeve that is mounted between the inner peripheral surface of the branch pipe and the outer peripheral surface of the rubber ring, and a flange that can directly or indirectly press the upper end of the rubber ring. An internal sleeve to be attached to, and a sleeve insertion step of inserting
By applying a pressing force to the inner sleeve and compressing the rubber ring with the rehabilitation pipe through the flange, the lower end of the inner sleeve is exposed from the lower end of the rubber ring to the inside of the rehabilitation pipe. And a rubber ring compression step for deforming the outer wall of the rehabilitation pipe into a built-up shape while bringing the peripheral wall of the rubber ring into close contact with the inner peripheral surface of the outer sleeve,
A diameter expanding step of bending the lower end of the interior sleeve while turning a part of the rubber ring exposed inside the rehabilitation pipe in an outwardly turned state, and caulking the interior sleeve to the rehabilitation pipe;
A pressure releasing step of releasing the pressing force and forming a branching portion in the rehabilitation pipe. In the branch pipe provided with a main pipe and a branch pipe branched from the main pipe, a branch structure to the branch pipe side of the rehabilitated pipe disposed in the pipeline of the main pipe ,
A perforated portion formed in the rehabilitation tube;
A cylindrical rubber ring attached to the perforated part and having a lower end entered into the rehabilitation pipe;
An outer sleeve mounted between the inner peripheral surface of the branch pipe and the outer peripheral surface of the rubber ring;
An internal sleeve that has a collar portion that directly or indirectly presses the upper end of the rubber ring and is mounted inside the cylindrical shape of the rubber ring,
The lower end of the inner sleeve is bent in a state where the rubber sleeve that has entered the inside of the rehabilitating pipe is wound outwardly, and the inner sleeve is crimped to the rehabilitating pipe, and the rubber ring Is held in a compressed state between the collar portion of the interior sleeve and the caulking stop,
Perforated rim water stop portion formed by sandwiching the tube wall of the rehabilitation pipe between the rehabilitation tube inner build-up portion formed by the rubber ring and the rehabilitation pipe outer build-up portion formed by compression of the rubber ring. When,
A bifurcated portion structure characterized in that an inter-sleeve water stop portion is formed by adhering a rubber ring between the outer sleeve and the inner sleeve.   The branch part structure according to claim 2, wherein a hook-like locking part that abuts on a branch pipe side flange formed at an opening end of the branch pipe is provided at an upper end of the exterior sleeve. . 4. The branch structure according to claim 2 , wherein a lower portion of the outer sleeve is expanded along a neck inner wall of the branch pipe by deformation accompanying compression of the rubber ring. 5. A connecting member side flange provided in a connecting member connected to the branch pipe is connected to the branch pipe side flange formed at the open end of the branch pipe, and the branch pipe is connected to the branch pipe.
The interior sleeve includes a protruding portion that protrudes from an end surface of the branch pipe side flange,
Between the branch pipe side flange and the connecting member side flange, a separation preventing plate having a hole having a diameter larger than the outer diameter of the inner sleeve and smaller than the inner diameter of the branch pipe is interposed. ,
The detachment locking portion formed to have an outer diameter larger than the diameter of the hole portion of the detachment prevention plate is provided at a position above the detachment prevention plate of the protrusion. The branched structure according to any one of 2 to 4.

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