JP5508102B2 - Branch pipe connection method - Google Patents

Description

  The present invention relates to a branch pipe connection branch pipe connecting method in which a branch pipe connection branch pipe is connected to a ribbed main pipe using a water stop rubber sheet.

  Conventionally, when connecting a branch pipe connected to a public sewage pipe and a sewer main pipe with a rib having a large number of annular ribs arranged on the outer peripheral surface (main pipe), first the circumference of the sewage main pipe is connected. A branch pipe connecting branch pipe is connected to an opening provided on the surface, and the branch pipe is connected to the sewage main pipe through the branch pipe connecting branch pipe.

Further, a rubber seal material (water stop rubber sheet) is interposed between the sewage main pipe and the branch pipe connecting branch pipe to prevent water leakage. For example, the inner surface of the rubber seal material in Patent Document 1 is provided with a rib fitting groove into which the rib of the sewage main pipe is fitted. And, with the rubber seal material interposed between the sewage main pipe and the branch pipe connecting branch pipe, each rib of the sewage main pipe is fitted into the rib fitting groove of the rubber seal material, ensuring a watertight state. Is done.
In Patent Document 1, a rubber seal material is first assembled to a branch pipe connecting branch pipe, and then the back surface of the rubber seal material assembled to the branch pipe connection branch pipe is brought into contact with an appropriate position on the outer peripheral surface of the sewage main pipe. The branch pipe connection branch pipe is connected to the sewage main pipe.

International Publication No. WO01 / 094834

However, the configuration of Patent Document 1 has a problem that workability is poor when the branch pipe connection branch pipe is connected. Specifically, the branch pipe connecting branch pipe is usually heavy, and an operator lifts the branch pipe connecting branch pipe while placing it at an appropriate position (perforation location) on the outer peripheral surface of the sewage main pipe. It is very time-consuming and labor-intensive to sequentially fit a large number of ribs arranged in parallel to the sewage main pipe into a large number of rib fitting grooves of a rubber seal material that is difficult to see.
In particular, the groove width of the rib fitting groove is set to a dimension that has almost no margin with respect to the rib thickness in order to enhance the water-stopping effect, and the groove wall is bent during the connection operation, and the rib fitting is performed. Since the groove opening of the groove is often in a narrowed state, the operation of fitting ribs into a large number of rib fitting grooves is extremely complicated and troublesome.

  Therefore, in order to solve the above problems, the present invention provides a rubber sheet for water stop around the branch pipe connection opening provided on the peripheral surface of the main pipe with ribs in which a large number of annular ribs are arranged on the outer peripheral surface. And connecting a branch pipe connection branch to the branch pipe connection opening of the main pipe via the water stop rubber sheet, the water stop rubber sheet being attached to the main pipe A large number of rib grooves on which the annular rib of the main pipe fits when attached to the outer peripheral surface are arranged in parallel on the back surface of the rubber sheet contacting the outer peripheral surface of the main pipe of the water-stopping rubber sheet, A rib groove alignment mark that fits in a plan view of the annular rib of the main pipe and the water-stopping rubber sheet with the water-stopping rubber sheet attached to an appropriate position on the outer peripheral surface of the main pipe, It should be provided in a portion other than the back side of the rubber sheet, and the annular rib of the main pipe and the rib groove alignment mark should not be visually matched. The annular rib is fitted into the rib groove so that the water-stopping rubber sheet is attached to an appropriate position on the outer peripheral surface of the main pipe, and then the branch pipe connecting branch pipe is placed on the water-stopping rubber sheet. The branch pipe connection branch pipe is connected to the branch pipe connection opening of the main pipe, and the branch pipe connection branch pipe connection method is provided.

  In the above configuration, if the water stop rubber sheet is attached to the main pipe so that the rib groove alignment mark of the water stop rubber sheet matches the annular rib of the main pipe, The rubber sheet can be easily and quickly applied to an appropriate position. Further, even when the annular ribs of the main pipe are fitted in the rib grooves of the water-stopping rubber sheet, the operator can carry out the operation by holding only the water-stopping rubber sheet. Therefore, the burden of the work of attaching the water-stopping rubber sheet, which is the most complicated and labor-intensive, is reduced, and the connecting work of the branch pipe connecting branch pipe is facilitated as a whole. Further, since the connection work is facilitated, the occurrence of poor connection of the branch pipe connection branch pipe can be reduced.

  In addition, a marked line along the pipe axis of the main pipe is displayed on the outer peripheral face of the main pipe, and the outer peripheral face of the main pipe is properly attached to a portion other than the rubber sheet rear face of the water stop rubber sheet. A mark alignment mark that is suitable for a plan view of the marked line displayed on the outer peripheral surface of the main pipe and the water-stopping rubber sheet in a state where it is attached to the main pipe is provided. It is desirable to apply the rubber sheet to an appropriate position on the outer peripheral surface of the main pipe while visually matching the mark of the main pipe and the mark for aligning the mark.

  In the above configuration, if the waterproof rubber sheet is attached to the main pipe so that the mark alignment mark of the waterproof rubber sheet matches the marked line displayed on the main pipe, Since the water-stopping rubber sheet can be attached to an appropriate position, workability when attaching the water-stopping rubber sheet is extremely good, and the water-stopping rubber sheet attached to the main pipe The positional accuracy is improved.

  Further, it is a connecting method using a branch pipe connecting guide member, the branch pipe connecting guide member is fitted in the pipe of the branch pipe connecting branch pipe in advance, and one end of the branch pipe connecting guide member is connected to the branch pipe Insert from the pipe end to be connected to the main pipe in the branch pipe for pipe connection, and set the inserted portion so that it can be inserted into the branch pipe connection opening of the main pipe. When connecting the branch pipe connecting branch pipe to the branch pipe connecting opening of the main pipe, the branch pipe connecting branch pipe is inserted into the branch pipe connecting opening while inserting the outlet portion of the branch pipe connecting guide member. A connecting method for branch pipe connecting branch pipes disposed on the water-stopping rubber sheet attached to the main pipe is desirable.

  In the above configuration, the branch pipe connecting branch pipe can be easily and quickly arranged on the water stop rubber sheet by the guiding action of the branch pipe connecting guide member.

  INDUSTRIAL APPLICABILITY The present invention has an effect that connection work between a main pipe using a water stop rubber sheet and a branch pipe connecting branch pipe can be easily and quickly performed.

Longitudinal sectional view showing the connection structure between the sewage main pipe and branch pipe connection branch pipe Exploded view of branch pipe connecting branch pipe External perspective view of water stop rubber sheet Front view of rubber sheet for water stop Side view of rubber sheet for water stop Back view of rubber sheet for water stop AA line sectional view of FIG. Partial enlarged sectional view of FIG. a) is a side view showing a state before the water-stopping rubber sheet is attached to the main pipe, b) is a side view showing a state where the water-stopping rubber sheet is attached to the sewage main pipe, and c) is a water stoppage. View showing a state in which a rubber sheet is attached to a sewer main Partial enlarged sectional view of FIG. 9b External perspective view of the branch pipe connecting guide member in use Side view showing the state before installing the branch pipe connection branch pipe Description longitudinal section showing the state when installing a branch pipe connection branch pipe Schematic showing the sewage main pipe and branch pipe connection branch from the side External perspective view of other forms of rubber sheet for water stop Back view of other forms of water stop rubber sheet

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments embodying the present invention will be described in detail.
As shown in FIG. 1 and the like, when connecting a branch pipe (not shown) to a cylindrical sewage main pipe (main pipe) 1 with ribs having a large number of annular ribs 1A arranged on the outer peripheral surface, The branch pipe connecting branch pipe 2 is connected to the branch pipe connecting opening 3 provided on the peripheral surface of the sewage main pipe 1 through the water stop rubber sheet 40.
The annular rib 1A of the sewage main pipe 1 is for securing strength and rigidity against earth pressure when the sewage main pipe 1 is buried. The branch pipe connection opening 3 is formed in a penetrating manner on the peripheral wall of the sewage main pipe 1 by using a drilling means such as a horuseau at a work site in consideration of the arrangement of the branch pipe. However, the branch pipe connection opening 3 is not limited to being formed at the work site, and the branch pipe connection opening 3 may be formed in advance at a factory or the like.

The branch pipe connecting branch pipe 2 will be described with reference to FIG.
As shown in FIGS. 1 and 2, the branch pipe connection branch pipe 2 includes a locking member 6 that is locked to the sewage main pipe 1, and an outer peripheral surface of the sewage main pipe 1 that is externally fitted to the locking member 6. And a connecting member 9 inserted into the saddle member 7 and finally connected to the branch pipe. The saddle member 7 constitutes a saddle portion of the branch pipe connecting branch pipe 2.

The locking member 6 is provided with a movable claw 4 and a fixed claw 5 that are locked to the periphery of the branch pipe connection opening 3 provided in the sewage main pipe 1. In the locking member 6, the movable claw 4 and the fixed claw 5 have a substantially L-shaped cross section, and each has a locking plate 10 that is extended substantially horizontally. The shape of the locking plate 10 is an arch shape along the shape of the inner peripheral surface of the peripheral edge of the branch pipe connection opening 3 of the sewage main pipe 1. The movable claw 4 is provided with a pair of pivot pins 11 projecting from the upper side surface of the movable claw 4 and pivotally mounted on the locking member 6 via the pivot pins 11. On the other hand, the fixing claw 5 is provided integrally with the locking member 6. Further, on the inner peripheral surface of the locking member 6 and above the locking plate 10 of the movable claw 4 and the fixed claw 5, a tapered contact step 13 having a diameter reduced downward is provided. Is provided.
In this embodiment, the movable claw 4 and the fixed claw 5 are arranged so as to be aligned in the pipe axis direction of the sewage main pipe 1 when the movable claw 4 and the fixed claw 5 are engaged with the branch pipe connection opening 3.

A pair of saddle plates 14, 14 are provided in the lower part of the saddle member 7 so as to extend substantially horizontally. The saddle plate 14 is made of a hard vinyl chloride resin, and a downward contact surface 15 that comes into contact with a rubber sheet surface 40A of a water-stopping rubber sheet 40 described later is curved along the outer peripheral surface of the sewage main pipe 1. It is made into a shape. Further, ribs 7A are provided on the upward peripheral surface of the saddle plate 14, and the rigidity, strength, etc. of the saddle plate 14 are ensured.
Further, a contact step 16 is provided on the upper inner peripheral surface of the saddle member 7, and an annular engagement claw 17 projects from the inner peripheral surface of the upper end of the saddle member 7.

An insertion portion 18 is provided below the connection member 9 via a flange portion 21. A downward step surface 23 is formed at the lower portion of the flange portion 21, and a ring-shaped packing 24 is fitted along the step surface 23. A locking step 22 is formed below the step surface 23. Furthermore, a tapered contact portion 20 having a diameter reduced in the distal direction of the insertion portion 18 is provided at the lower end portion of the insertion portion 18.
Further, a pair of left and right foldable handles 25 are attached to the outer periphery of the connecting member 9. A rubber ring receiving port 8 into which the branch pipe is inserted is provided at the upper part of the connecting member 9, and a rubber ring 31 abutting on the peripheral surface of the branch pipe is provided on the inner peripheral surface of the rubber ring receiving port 8. It is installed.

In addition, in the connection member 9, a ring-shaped pressing member 26 is fitted to the locking step portion 22. As shown in FIG. 2, the pressing member 26 has a substantially L-shaped cross section, is externally inserted into the insertion portion 18 of the connection member 9, and is placed on the step surface 23 of the connection member 9 via the packing 24. The upper peripheral surface 27 of the pressing member 26 abuts, and the inner upper peripheral surface 30 of the pressing member 26 abuts on the locking step portion 22 of the connecting member 9.
Further, the pressing member 26 is provided with a lower peripheral surface 28 on which the contact step 16 of the saddle member 7 and the upper end 6A of the locking member 6 contact.

The water stop rubber sheet 40 according to the present invention will be described with reference to FIG.
As shown in FIG. 1, the water stop rubber sheet 40 is interposed between the outer peripheral surface of the sewage main pipe 1 and the saddle plate 14 of the saddle member 7. A rubber material such as natural rubber or synthetic rubber is adopted as the material for the water-stopping rubber sheet 40, and the rubber sheet 40 is formed in a substantially horseshoe shape as a whole.

As shown in FIG. 3 and the like, a substantially rectangular rubber sheet opening 43 is formed substantially at the center of the water-stopping rubber sheet 40. Moreover, as shown in FIGS. 6 and 7, the annular rib 1 </ b> A of the sewage main pipe 1 is fitted on the rubber sheet back surface 40 </ b> B that contacts the outer peripheral surface of the sewage main pipe 1 in the water stop rubber sheet 40. A large number of rib grooves 41 are arranged in parallel.
In addition, a single water stopping protrusion 42 is provided on the rubber sheet back surface 40B so as to surround the rubber sheet opening 43. As shown in FIG. 10, the water stopping ridge 42 is configured such that the tip edge of the water stopping ridge 42 has the sewage water in a state where the water stopping rubber sheet 40 is attached to the sewage main pipe 1. As shown in FIG. 8, the water stop rubber sheet 40 adheres to the sewage main pipe 1 in the protruding direction L of the water stop ridge 42 as shown in FIG. In this state, it is set in a direction orthogonal to the outer peripheral surface of the sewage main pipe 1.

Further, at the portion where the rib groove 41 and the water stopping ridge 42 intersect on the rubber sheet back surface 40B, the water stopping ridge 42 is also provided along the groove wall in the rib groove 41. When the annular rib 1A is fitted into the rib groove 41, the leading edge of the water stopping ridge 42 is set in pressure contact with the annular rib 1A.
Moreover, as shown in FIG. 6, the rib groove 41 and the water stopping protrusion 42 intersecting each other are set so as to be orthogonal when viewed from the rubber sheet back surface 40B side.

  Further, among the rib grooves 41 described above, a pair of rib grooves 41 </ b> A located at both ends in the tube axis direction of the sewage main pipe 1 in a state where the rubber sheet for water stop 40 is attached to the sewage main pipe 1. 41A is set so that it may be arrange | positioned on the outer side of this protrusion 42 for water stop.

  On the other hand, as shown in FIG. 8, a single auxiliary protrusion 45 surrounds the rubber sheet opening 43 on the rubber sheet surface 40 </ b> A that is opposite to the rubber sheet back surface 40 </ b> B and is in contact with the saddle member 7. Is provided. The auxiliary protrusion 45 is disposed at a position directly behind the water stopping protrusion 42 in the protrusion direction L of the water stopping protrusion 42 and is opposite to the protrusion direction L of the water stopping protrusion 42. Protruding.

Also, the rubber sheet surface 40A is provided with both end rib groove alignment marks 46, 46 provided along the rib grooves 41A, 41A at both ends in a groove shape. Further, as shown in FIG. 3, the rubber sheet surface 40A is provided in the center of the sewage main pipe 1 with the water-stopping rubber sheet 40 properly attached to the sewage main pipe 1. A mark alignment mark 47 that matches the mark 1B (see FIG. 9c) along the tube axis is also provided.
Further, a rib groove alignment mark 48 adapted to the position of the rib groove 41 of the sewage main pipe 1 is also formed in a groove shape on a pair of peripheral edges parallel to the pipe axis of the sewage main pipe 1 in the rubber sheet opening 43. Are provided in plurality.
The shape and the like of the alignment marks 46, 47, and 48 may be other configurations, may be convex, may be displayed with a marker, or may be linear. It may be a dot shape.

In the configuration described so far, in order to connect the branch pipe connecting branch pipe 2 to the sewage main pipe 1, first, the water stop rubber sheet 40 is attached to the sewage main pipe 1.
At this time, as shown in FIG. 9a, the branch pipe connection opening 3 provided in the sewage main pipe 1 and the rubber sheet opening 43 of the water stop rubber sheet 40 are communicated with each other. While visually observing the alignment marks 46, 47, 48, the rib groove alignment marks 46 at both ends and the corresponding annular rib 1 A, the marked line alignment marks 47 and 1 B, and the rib groove alignment mark 48. And the annular rib 1A are respectively fitted, and the annular rib 1A of the sewage main pipe 1 is fitted into the rib grooves 41 and 41A of the water-stopping rubber sheet 40, respectively, and the outer periphery of the sewage main pipe 1 is fitted. As shown in FIGS. 9 b and 9 c, the water-stopping rubber sheet 40 is connected to the sewage main pipe 1 with the surface and the annular rib 1 </ b> A pressed against the water-stopping protrusion 42 of the water-stopping rubber sheet 40. It adheres to the proper position of the outer peripheral surface of.
In addition, after applying a bonding agent to the outer peripheral surface of the sewage main pipe 1 and / or the rubber sheet back surface 40B of the water stop rubber sheet 40, the water stop rubber sheet 40 may be attached.

Next, the branch pipe connecting branch pipe 2 is connected to the sewage main pipe 1.
Specifically, as shown in FIG. 11, a branch pipe connection guide member 65 made of, for example, a single piece of corrugated cardboard is inserted into the pipe via the pipe end of the branch pipe connection branch pipe 2 and removed in advance. One end of the branch pipe connection guide member 65 is inserted from the pipe end of the branch pipe connection branch pipe 2 on the sewage main pipe 1 side, and the inserted delivery part 65A is inserted into the branch pipe connection opening. 3 has a dimension and shape that can be inserted.
Then, at the time of connection work, as shown in FIG. 12, the contact surface of the saddle plate 14 of the saddle member 7 is inserted while inserting the feeding portion 65A of the branch pipe connection guide member 65 into the branch pipe connection opening 3. 15 is brought into contact with the rubber sheet surface 40A of the water-stopping rubber sheet 40, and the branch pipe connecting branch pipe 2 is disposed at an appropriate position with respect to the sewage main pipe 1.
The branch pipe connection guide member 65 may be made of a known foam material or the like instead of the cardboard. Further, the branch pipe connecting guide member 65 may be a combination of two plate pieces in a cross shape in plan view.

Further, as shown in FIG. 13, the fixed claw 5 of the locking member 6 is locked to the inner peripheral surface of the peripheral edge of the branch pipe connection opening 3 of the sewage main pipe 1, and the movable claw 4 is connected to the pivot pin 11. Is turned inward so that the movable claw 4 can pass through the branch pipe connection opening 3.
Next, after passing the movable claw 4 of the locking member 6 through the branch pipe connection opening 3 of the sewage main pipe 1, the movable claw 4 is rotated outwardly around the pivot pin 11, The movable claw 4 is locked to the inner peripheral surface of the peripheral edge of the branch pipe connection opening 3. Thereafter, the abutment portion 20 of the insertion portion 18 of the connection member 9 is brought into contact with the abutment step portion 13 of the locking member 6 while the handle 25 is used as a clue, and the flange portion 21 of the connection member 9 and the saddle member 7 The annular engagement claw 17 is engaged, and the contact step 16 of the saddle member 7 and the upper end 6A of the locking member 6 are brought into contact with the lower peripheral surface 28 of the pressing member 26. Then, the upper portion of the movable claw 4 is also sandwiched between the outer peripheral surface of the insertion portion 18 of the connecting member 9 and the inner peripheral surface of the saddle member 7, and the rotation of the movable claw 4 is prevented. It is impossible to pass through the connection opening 3.
As a result, the branch pipe connecting branch pipe 2 is securely connected to the sewage main pipe 1, and the saddle plate 14 of the saddle member 7 has a contact surface 15 between the contact surface 15 and the outer peripheral face of the sewage main pipe 1. A water-stopping rubber sheet 40 is interposed (see FIG. 1). In such an interposed state, the tip edge of the auxiliary protrusion 45 of the water stop rubber sheet 40 is in pressure contact with the contact surface 15 of the saddle plate 14 and the tip of the water stop protrusion 42 is provided. The edge is pressed against the outer peripheral surface of the sewage main pipe 1 and the annular rib 1A, and a watertight state is secured.
The branch pipe connecting guide member 65 may be taken out from the branch pipe connecting branch pipe 2 and discarded when it becomes unnecessary.

  Here, in the connection structure 60 between the sewage main pipe 1 and the branch pipe connecting branch pipe 2, as shown in FIG. 14, the curvature radius R1 of the contact surface 15 of the saddle plate 14 of the saddle member 7 is It is set to be smaller than the radius of curvature R2 of the rubber sheet surface 40A of the water-stopping rubber sheet 40 attached to the outer peripheral surface of the sewage main pipe 1 and in a curved state. With this configuration, the saddle plate 14 comes into contact with the water-stopping rubber sheet 40 while strongly biting into it, and the sealing performance of the water-stopping rubber sheet 40 is further improved.

In place of the water-stopping rubber sheet 40, a water-stopping rubber sheet 50 shown in FIG. 15 or the like may be used. Specifically, the water-stopping rubber sheet 50 has a substantially circular shape in plan view, and a substantially circular rubber sheet opening 53 is formed at the center. In addition, a water stop protrusion 52 is provided on the rubber sheet back surface 50 </ b> B of the water stop rubber sheet 50 so as to surround the rubber sheet opening 53.
Further, a large number of rib grooves 51 are arranged in parallel on the rubber sheet back surface 50 </ b> B, and the sewage with the water-stopping rubber sheet 50 attached to the sewage main pipe 1 in the rib grooves 51 is provided. The rib grooves 51 </ b> A and 51 </ b> A located at both ends in the pipe axis direction of the main pipe 1 are disposed outside the water stopping protrusion 52.
Further, the auxiliary protrusion 55 is provided on the rubber sheet surface 50 </ b> A, and a mark alignment mark 57 and a rib groove alignment mark 58 are further provided.

The present invention is not limited to the above-described embodiment, and can be appropriately changed in design without departing from the gist of the present invention. For example, the external shape of the water-stopping rubber sheets 40 and 50 can be changed as appropriate. Moreover, the connection structure of the sewage main pipe 1 and the branch pipe connecting branch pipe 2 can be changed as appropriate.
Moreover, you may use the rubber sheet 40,50 for water stop in which the above-mentioned auxiliary | assistant protrusion 45,55 is not provided.
Further, the radius of curvature R1 of the contact surface 15 of the saddle plate 14 and the radius of curvature R2 of the rubber sheet surfaces 40A and 50A of the water-stopping rubber sheets 40 and 50 may be set to be equal.
Further, the branch pipe connecting branch pipe 2 described above is a so-called rotational mounting type branch pipe, but other types of branch pipes may be used. For example, it may be a known branch pipe connection branch pipe that is fixed to a sewage main pipe using a wire.

1 Sewage main (main)
1A Annular rib 1B Mark line 2 Branch pipe connection branch 3 Branch pipe connection opening 40, 50 Water stop rubber sheet 40A, 50A Rubber sheet surface (surface of water stop rubber sheet)
40B, 50B Rubber sheet back side (back side of water stop rubber sheet)
41, 41A, 51, 51A Rib groove 46, 48, 58 Rib groove alignment mark 47, 57 Mark alignment mark 65 Branch pipe connection guide member 65A Outlet

Claims (3)

A waterproof rubber sheet is attached to the periphery of the branch pipe connection opening provided on the peripheral surface of the main pipe with the rib having a large number of annular ribs arranged in parallel on the outer peripheral surface. A branch pipe connecting branch pipe to the branch pipe connecting opening of the main pipe via,
The rubber that contacts the outer peripheral surface of the main pipe of the water stop rubber sheet with the rib groove into which the annular rib of the main pipe is fitted when the water stop rubber sheet is attached to the outer peripheral face of the main pipe A lot of them are installed on the back of the seat,
A rib groove alignment mark that fits when the annular rib of the main pipe and the water sealing rubber sheet are viewed in plan with the rubber sheet for water stop attached to an appropriate position on the outer peripheral surface of the main pipe. , Provided in a portion other than the back side of the rubber sheet,
While fitting the annular rib of the main pipe with the rib groove alignment mark visually, the annular rib is fitted into the rib groove so that the water-stopping rubber sheet is positioned at an appropriate position on the outer peripheral surface of the main pipe. The branch pipe connecting branch pipe is disposed on the water stop rubber sheet, and the branch pipe connecting branch pipe is connected to the branch pipe connecting opening of the main pipe. How to connect a branch pipe for branch pipe connection. On the outer peripheral surface of the main pipe, a mark line along the pipe axis of the main pipe is displayed,
The marked line displayed on the outer peripheral surface of the main pipe and the rubber sheet for water stoppage in a state of being attached to a portion other than the back surface of the rubber sheet of the water stopping rubber sheet at an appropriate position on the outer peripheral surface of the main pipe. A mark alignment mark that fits in plan view is provided,
The branch pipe according to claim 1, wherein the water-stopping rubber sheet is attached to an appropriate position on the outer peripheral surface of the main pipe while visually matching the marked line of the main pipe and the mark for aligning the marked line. Connection method for connecting branch pipes. A connection method using a guide member for connecting a branch pipe,
A pipe end that is fitted into the branch pipe connecting guide member in advance in the branch pipe connecting branch pipe, and one end of the branch pipe connecting guide member is connected to the main pipe in the branch pipe connecting branch pipe Set to a dimension and shape that can be inserted into the branch pipe connection opening of the main pipe,
When connecting the branch pipe connection branch pipe to the branch pipe connection opening portion of the main pipe, the branch pipe connection guide member is inserted into the branch pipe connection opening portion while inserting the extension portion of the branch pipe connection guide member. The branch pipe connecting branch pipe connection method according to claim 1 or 2, wherein the branch pipe is disposed on the water-stopping rubber sheet attached to the main pipe.