Waterproof structure and waterproof construction method for roofs using communication pipes with flanges and reverse-beam construction method

Abstract

To provide a communication pipe, which is the communication pipe with a flange inserted for waterproofing purposes into a penetration hole provided in a beam protruding from a roof of a concrete building using reverse-beam construction method to allow rainwater to flow from one side of the beam to the other, with excellent adhesiveness with a waterproofing layer and good fit without need for work to attach or remove the flange.SOLUTION: A communication pipe with a flange (1) comprises: a tubular section (2); a first flange section (3) extending from one end of the tubular section; and a second flange section (4) extending from the other end of the tubular section. The tubular section is formed of resin or rubber, the first flange section and second flange section are formed of resin or rubber, and the first flange section is foldable.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a flanged communicating pipe, a waterproof structure for a roof using a reverse beam construction method, and a waterproofing method. More specifically, the present invention relates to a flanged communicating pipe that is inserted for the purpose of waterproofing into a through hole that is provided so as to allow rainwater to flow from one side of a beam protruding from the roof of a concrete building using a reverse beam construction method, a waterproof structure for the roof of a concrete building using a protruding beam using a reverse beam construction method that includes the flanged communicating pipe, and a waterproofing method for a roof using a reverse beam construction method that uses the flanged communicating pipe. [Background technology]

[0002] A normal rigid frame structure has the disadvantage that the beams protrude from the ceiling into the interior, compressing the interior space and forcing the windows to reach the bottom of the beams. On the other hand, the reverse beam construction method inverts the beams that normally protrude from the ceiling into the interior and installs them so that they rise from the floor, making the ceiling flat, ensuring interior space and making it possible to raise the windows all the way up to the ceiling. The reverse beam construction method has great advantages in terms of interior space, but it has the disadvantage that the beams protrude on the exterior rooftop and the areas surrounded by the beams tend to collect rainwater. As a means for solving this problem, drainage can be improved by providing through holes in the beams and installing drains or the like.

[0003] For drainage purposes, a metal connecting pipe with a single flange is generally used, and the part without the flange is cut and sealed in place.

[0004] Utility Model Registration No. 3141896 (Patent Document 1) discloses a waterproof structure for a rooftop with a protruding inverted beam section, characterized in that the rooftop surface is covered with a waterproof layer, a circulation pipe is inserted through the inverted beam section so as to cross the inside of the inverted beam section, both ends of the circulation pipe are inserted through the waterproof layer formed across both sides of the inverted beam section, and a waterproof layer pressing metal fitting is attached to the protruding end to press the waterproof layer from the outside. The communicating pipe disclosed in Patent Document 1 is characterized in that a pressing type waterproof layer pressing metal fitting is attached to both ends to ensure the sealing of the waterproof layer.

[0005] Japanese Patent No. 4,861,837 (Patent Document 2) discloses a rainwater drainage device for enabling rainwater to flow from one side of a beam protruding from the rooftop of a concrete building using an inverted beam construction method to the other side, the device comprising: a drainage pipe provided at the bottom of the beam so as to penetrate the beam; and roof drains provided at both ends of the drainage pipe, each of the roof drains comprising a receptacle body with a substantially L-shaped cross section having a base portion arranged along the floor surface of the rooftop and an upright portion arranged along the rising side of the beam, an end of the drainage pipe is joined to the upright portion so that the drainage pipe leads to the inside of the receptacle body, waterproof layers are attached to the floor surface of the rooftop and the rising side of the beam, the edges of these waterproof layers are overlapped with the waterproof layer receptacle portion in a predetermined area of ​​the base portion and the waterproof layer receptacle portion in a predetermined area of ​​the upright portion, a waterproof layer holder is fastened and fixed onto the receptacle body in this state, and the fastening force of the waterproof layers presses the waterproof layer receptacles against the waterproof layer receptacles via the waterproof layer holder. The communication pipe disclosed in Patent Document 2 is characterized by a pipe that penetrates a beam and metal L-shaped drains attached to both ends of the pipe.

[0006] Japanese Utility Model Publication No. 6-31006 (Patent Document 3) discloses a drain communication structure for a rising wall, etc., which is characterized in that the communication pipe is made of two flanged pipes formed of thin steel plates and closely fitted together at the joint part so that it can be telescopically expanded and contracted, the flange parts on both sides have fixed plates protruding forward from their lower ends, the distance between the flange parts on both sides is made to match the wall thickness of the rising wall, a rubber packing is attached to the outer periphery of the joint part, and the inner periphery is waterproofed by applying asphalt, the fixed plates on both sides are installed horizontally at the same level as the drain water surface or a level slightly deeper than the level, the flange parts on both sides are closely attached to the inner surface of the formwork for the rising wall, etc., and fixed by nailing, and the pipe is embedded in concrete, and a drain communication hole is penetrated in the wall thickness direction. The communication pipe disclosed in Patent Document 3 is characterized in that it is expandable and has both L-shaped flanges. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Utility Model Registration No. 3141896 [Patent Document 2] Patent No. 4861837 [Patent Document 3] Publication No. 6-31006 Summary of the Invention [Problem to be solved by the invention]

[0008] When using a metal communication pipe with a single flange, the part that is sealed without the flange will not fit well and will not look good, and durability cannot be expected. The communicating pipes disclosed in Patent Documents 1 to 3 are metal communicating pipes that are attached by removing the flanges at both ends. However, since it is time-consuming to remove the flanges at both ends and attach the pipes, the pipes are difficult to install and are heavy and difficult to transport. An object of the present invention is to provide a flanged communicating pipe which does not require the work of attaching and removing the flange, has excellent adhesion to a waterproof layer, and fits well. [Means for solving the problem]

[0009] The present invention (I) is a flanged communicating pipe which is inserted for waterproofing purposes into a through hole provided to allow rainwater to flow from one side of a beam protruding from the roof of a concrete building using a reverse beam construction method, the through hole being provided to allow rainwater to flow from one side of the beam to the other side, the flanged communicating pipe having a tubular portion, a first flange portion extending from one end of the tubular portion, and a second flange portion extending from the other end of the tubular portion, the tubular portion being formed from resin or rubber, the first flange portion and the second flange portion being formed from resin or rubber, and the first flange portion being foldable.

[0010] The present invention (II) is a waterproof structure for the roof of a concrete building with protruding beams using the reverse beam construction method, in which a through hole is provided to allow rainwater to flow from one side of the beam to the other side, a flanged communicating pipe as described in claim 1 is inserted into the through hole, the first and second flanges of the flanged communicating pipe are fixed to the rising side of the beam and the floor surface of the roof, and a waterproof layer is laid at least on the floor surface of the roof and the rising side of the beam. The present invention (III) is a waterproof structure for the roof of a concrete building having protruding beams by a reverse beam construction method, in which a through hole is provided to allow the flow of rainwater from one side of the beam to the other side, and a flanged communicating pipe is inserted into the through hole, the flanged communicating pipe has a tubular portion, a first flange portion extending from one end of the tubular portion, and a second flange portion extending from the other end of the tubular portion, and when a point B1 is defined as a point where a straight line extending from a center of gravity C1 of a figure constituting an inner periphery of the first flange portion, through the surface of the first flange portion, to a point A1 on the outer periphery of the first flange portion intersects with the inner periphery of the first flange portion, the longest line segment among the line segments connecting points A1 and B1 has a length of 250 mm, and the shortest line segment among the line segments connecting points A1 and B1 has a length of 15 mm, a waterproof structure for a roof using a reverse beam method, in which, when a straight line from the center of gravity C2 of the figure constituting the inner circumference of the second flange, through the surface of the second flange, to point A2 on the outer circumference of the second flange, intersects with the inner circumference of the second flange at point B2, the length of the longest line segment connecting points A2 and B2 is 250 mm and the length of the shortest line segment connecting points A2 and B2 is 15 mm, the tubular portion is formed of resin or rubber, the first flange is fixed to one rising side of the beam and to the floor surface of the roof, and the first flange is fixed to the other rising side of the beam and to the floor surface of the roof, and a waterproof layer is laid on at least the floor surface of the roof and the rising sides of the beam. The present invention (IV) is a waterproof structure for the roof of a concrete building with protruding beams by the reverse beam construction method, in which a through hole is provided to allow the flow of rainwater from one side of the beam to the other side, and a flanged communicating pipe is inserted into the through hole, the flanged communicating pipe has a tubular portion, a first flange portion extending from one end of the tubular portion, and a second flange portion extending from the other end of the tubular portion, the first flange portion having a substantially circular outer peripheral shape, This is a waterproofing structure for a roof using the reverse beam construction method, in which the flange has an upright portion and a horizontal portion, the tubular portion, the first flange and the second flange are formed of flexible resin, the upright portion of the second flange is fixed to one rising side of the beam, the horizontal portion of the second flange is fixed to the floor surface of the roof, and the first flange is fixed to the other rising side of the beam and to the floor surface of the roof, and a waterproof layer is laid at least on the floor surface of the roof and the rising sides of the beam.

[0011] The present invention (V) is a waterproofing method for the roof of a concrete building in which a beam is protruding by the reverse beam construction method and a through hole is provided so as to allow rainwater to flow from one side of the beam to the other side, said method comprising the steps of: A step of preparing a flanged communicating pipe according to the present invention (I); a step of folding a first flange of the flanged communicating pipe to a size that allows it to pass through the through hole and fastening the first flange with a tape or a string; inserting the flanged communicating pipe into the through hole with the folded first flange portion first; After insertion, removing the tape or string to open the first flange; and A process of attaching a waterproof layer to the first flange and the second flange after fixing the first flange and the second flange to the rising side surface of the beam and the floor surface of the roof, or a process of attaching the first flange and the second flange to the waterproof layer provided on the rising side surface of the beam and the floor surface of the roof. This is a waterproofing construction method for roofs using the reverse beam construction method, including the following. The present invention (VI) is a waterproofing method for the roof of a concrete building in which a beam is protruding by the reverse beam construction method and a through hole is provided so as to allow rainwater to flow from one side of the beam to the other side, said method comprising the steps of: a step of preparing a flanged communicating pipe having a tubular portion, a first flange portion extending from one end of the tubular portion, and a second flange portion extending from the other end of the tubular portion, the tubular portion being formed of resin or rubber, the first flange portion and the second flange portion being formed of resin or rubber, and the first flange portion being foldable; a step of folding a first flange of the flanged communicating pipe to a size that allows it to pass through the through hole and fastening the first flange with a tape or a string; inserting the flanged communicating pipe into the through hole with the folded first flange portion first; After insertion, removing the tape or string to open the first flange; and A process of attaching a waterproof layer to the first flange and the second flange after fixing the first flange and the second flange to the rising side surface of the beam and the floor surface of the roof, or a process of attaching the first flange and the second flange to the waterproof layer provided on the rising side surface of the beam and the floor surface of the roof. This is a waterproofing construction method for roofs using the reverse beam construction method, including the following.

[0012] The present invention includes the following embodiments. [1] A flanged communicating pipe is inserted for waterproofing purposes into a through hole that is provided on the roof of a concrete building to allow rainwater to flow from one side of the beam protruding from the roof using a reverse beam construction method, the flanged communicating pipe having a tubular portion, a first flange portion extending from one end of the tubular portion, and a second flange portion extending from the other end of the tubular portion, the tubular portion being formed of resin or rubber, the first flange portion and the second flange portion being formed of resin or rubber, and the first flange portion being foldable. [2] If the point at which a straight line extending from the center of gravity C1 of the figure constituting the inner circumference of the first flange, through the surface of the first flange, to point A1 on the outer circumference of the first flange intersects with the inner circumference of the first flange is point B1, the length of the longest line segment connecting point A1 and point B1 is 250 mm, and the length of the shortest line segment connecting point A1 and point B1 is 15 mm, The flanged communicating pipe described in [1], wherein when a straight line extending from a center of gravity C2 of a figure constituting the inner circumference of the second flange, through the surface of the second flange, to a point A2 on the outer circumference of the second flange intersects with the inner circumference of the second flange at point B2, the longest line segment connecting points A2 and B2 has a length of 250 mm, and the shortest line segment connecting points A2 and B2 has a length of 15 mm. [3] A flanged communicating pipe as described in [1] or [2], wherein at least one of the first flange portion and the second flange portion has an outer peripheral shape that is approximately circular or approximately rectangular and can be folded to pass through the through hole of the beam. [4] The flanged communicating pipe according to any one of [1] to [3], wherein the resin or rubber forming the first flange and the second flange is flexible. [5] The flanged communicating pipe according to any one of [1] to [4], wherein the resin forming the first flange and the second flange is a thermoplastic resin or a thermosetting resin, and the rubber forming the first flange and the second flange is a synthetic rubber. [6] The flanged communicating pipe according to [5], wherein the thermoplastic resin is polyvinyl chloride resin, acrylic resin or polyolefin resin, the thermosetting resin is unsaturated polyester resin, epoxy resin or polyurethane resin, and the synthetic rubber is EPDM or urethane rubber. [7] The flanged communicating pipe according to any one of [1] to [6], wherein the resin forming the first flange and the second flange is a soft polyvinyl chloride resin. [8] The flanged communicating pipe according to any one of [1] to [7], wherein the first flange portion has an outer circumferential shape that is substantially circular or substantially rectangular. [9] The flanged communicating pipe according to any one of [1] to [8], wherein the first flange portion has a substantially circular outer peripheral shape, an outer diameter of 60 to 650 mm, an inner diameter of 30 to 150 mm, and a thickness of 0.5 to 5.0 mm.

[10] The flanged communicating pipe according to any one of [1] to [9], wherein the first flange portion, when folded, can have a dimension substantially equal to or smaller than an outer diameter of the tubular portion.

[11] The flanged communicating pipe according to any one of [1] to

[10] , wherein the second flange has an upright portion and a horizontal portion, and has an L-shaped cross section when cut along a plane perpendicular to both the upright portion and the horizontal portion.

[12] The flanged communicating pipe described in

[11] , wherein the upright portion of the second flange has a rectangular or square outer peripheral shape with a vertical length of 45 to 400 mm and a horizontal length of 60 to 650 mm, and the horizontal portion of the second flange has a rectangular or square outer peripheral shape with a length perpendicular to the upright portion of 15 to 400 mm and a length parallel to the intersection line of the upright portion and the horizontal portion of 60 to 650 mm.

[13] The flanged communicating pipe according to

[11] or

[12] , wherein the upright portion and the horizontal portion of the second flange have a thickness of 0.5 to 5.0 mm.

[14] The flanged communicating pipe according to any one of [1] to

[13] , wherein the tubular portion has a substantially circular annular cross section.

[15] The flanged communicating pipe according to

[14] , wherein the tubular portion has a length of 100 to 8000 mm, an outer diameter of 30 to 150 mm, and a thickness of 0.5 to 15.0 mm.

[16] The flanged communicating pipe according to any one of [1] to

[15] , wherein the tubular portion is made of a combination of soft polyvinyl chloride resin and hard polyvinyl chloride resin.

[17] A waterproofing structure for the roof of a concrete building with protruding beams using the reverse beam construction method, in which a through hole is provided to allow rainwater to flow from one side of the beam to the other, a flanged communicating pipe described in [1] is inserted into the through hole, the first and second flanges of the flanged communicating pipe are fixed to the rising side of the beam and the floor surface of the roof, and a waterproofing layer is laid at least on the floor surface of the roof and the rising side of the beam.

[18] A waterproofing structure for the roof of a concrete building with protruding beams using the reverse beam construction method, in which a through hole is provided to allow rainwater to flow from one side of the beam to the other side, and a flanged communicating pipe is inserted into the through hole, the flanged communicating pipe has a tubular portion, a first flange extending from one end of the tubular portion, and a second flange extending from the other end of the tubular portion, and when the point at which a straight line extending from the center of gravity C1 of the figure constituting the inner circumference of the first flange, through the surface of the first flange, to point A1 on the outer circumference of the first flange intersects with the inner circumference of the first flange is defined as point B1, the length of the longest line segment connecting point A1 and point B1 is 250 mm, the length of the shortest line segment connecting point A1 and point B1 is 15 mm, and a waterproofing structure for a roof using a reverse beam construction method, wherein, when a straight line from the center of gravity C2 of the figure constituting the inner circumference of the flange, through the surface of the second flange, to point A2 on the outer circumference of the second flange, intersects with the inner circumference of the second flange at point B2, the length of the longest line segment connecting points A2 and B2 is 250 mm and the length of the shortest line segment connecting points A2 and B2 is 15 mm, the tubular portion is formed of resin or rubber, the first flange and the second flange are formed of flexible resin or rubber, the first flange is fixed to one rising side of the beam and to the floor surface of the roof, and the second flange is fixed to the other rising side of the beam and to the floor surface of the roof, and a waterproofing layer is laid on at least the floor surface of the roof and the rising sides of the beam.

[19] A waterproofing structure for the roof of a concrete building with protruding beams using the reverse beam construction method, wherein a through hole is provided to allow rainwater to flow from one side of the beam to the other side, a flanged communicating pipe is inserted into the through hole, the flanged communicating pipe has a tubular portion, a first flange extending from one end of the tubular portion and a second flange extending from the other end of the tubular portion, the first flange has an approximately circular outer peripheral shape, the second flange has an upright portion and a horizontal portion, the tubular portion, the first flange and the second flange are formed of flexible resin, the upright portion of the second flange is fixed to one rising side of the beam, the horizontal portion of the second flange is fixed to the floor surface of the roof, and the first flange is fixed to the other rising side of the beam and the floor surface of the roof, and a waterproofing layer is laid on at least the floor surface of the roof and the rising side of the beam.

[20] A waterproof structure for a roof using the inverted beam construction method described in any one of

[17] to

[19] , wherein the waterproof layer is a synthetic polymer roofing sheet waterproof layer, an asphalt waterproof layer or a modified asphalt waterproof layer, or a coating waterproof layer.

[21] A waterproofing method for the roof of a concrete building in which a beam protrudes by the reverse beam construction method and a through hole is provided to allow rainwater to flow from one side of the beam to the other side, said method comprising the steps of: A step of preparing a flanged communicating pipe according to any one of [1] to

[16] ; a step of folding a first flange of the flanged communicating pipe to a size that allows the first flange to pass through the through hole, and fastening the folded portion with tape or tying with a string; inserting the flanged communicating pipe into the through hole with the folded first flange portion first; After insertion, removing the tape or string to open the first flange; and A process of attaching a waterproof layer to the first flange and the second flange after fixing the first flange and the second flange to the rising side surface of the beam and the floor surface of the roof, or a process of attaching the first flange and the second flange to the waterproof layer provided on the rising side surface of the beam and the floor surface of the roof. This includes waterproofing construction methods for roofs using the reverse beam method.

[22] A waterproofing method for the roof of a concrete building in which a beam protrudes by the reverse beam construction method and a through hole is provided to allow rainwater to flow from one side of the beam to the other side, said method comprising the steps of: a step of preparing a flanged communicating pipe having a tubular portion, a first flange portion extending from one end of the tubular portion, and a second flange portion extending from the other end of the tubular portion, the tubular portion being formed of resin or rubber, the first flange portion and the second flange portion being formed of resin or rubber, and the first flange portion being foldable; a step of folding a first flange of the flanged communicating pipe to a size that allows the first flange to pass through the through hole, and fastening the folded portion with tape or tying with a string; inserting the flanged communicating pipe into the through hole with the folded first flange portion first; After insertion, removing the tape or string to open the first flange; and A process of attaching a waterproof layer to the first flange and the second flange after fixing the first flange and the second flange to the rising side surface of the beam and the floor surface of the roof, or a process of attaching the first flange and the second flange to the waterproof layer provided on the rising side surface of the beam and the floor surface of the roof. This includes waterproofing construction methods for roofs using the reverse beam method. Effect of the Invention

[0013] In the flanged communicating pipe of the present invention, both flanges and the tubular portion are integrated, so there is no need to attach or remove the flanges. In addition, since the first flange is foldable, it can be folded and passed through the through hole. In addition, in the commonly used single flange drain construction, the side without the flange has exposed piping, which makes for poor fitting, whereas the flanged communicating pipe of the present invention is a double flange type, so it fits well. In addition, since the flange is made of resin or rubber, it is compatible with the waterproof layer and has good adhesion (when the flange is made of soft polyvinyl chloride resin, it has particularly good adhesion to polyvinyl chloride waterproof sheets). [Brief description of the drawings]

[0014] [Figure 1] FIG. 1 is a perspective view of a flanged communicating pipe according to the present invention (I). [Diagram 2] FIG. 2 is a cross-sectional view of a waterproof structure for a roof according to the present invention (II). [Diagram 3] FIG. 3 shows the shape of one embodiment of the first collar. [Figure 4] FIG. 4 shows the shape of one embodiment of the second collar portion. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] Hereinafter, the present invention will be described in detail with reference to the drawings, but the present invention is not limited to those shown in the drawings. FIG. 1 is a perspective view of a flanged communicating pipe according to the present invention (I), and FIG. 2 is a cross-sectional view of a rooftop waterproof structure according to the present invention (II). The flanged communicating pipe 1 is inserted for waterproofing purposes into a through hole 15 that is provided to allow rainwater to flow from one side of a beam 12 protruding from the roof of a concrete building using a reverse beam construction method to the other side of the beam 12, and the flanged communicating pipe 1 has a tubular portion 2, a first flange portion 3 extending from one end of the tubular portion, and a second flange portion 4 extending from the other end of the tubular portion, the tubular portion 2 being formed of resin or rubber, the first flange portion 3 and the second flange portion 4 being formed of resin or rubber, and the first flange portion 3 being foldable.

[0016] The flanged communicating pipe 1 has a tubular portion 2 , a first flange portion 3 , and a second flange portion 4 .

[0017] The tubular portion 2 preferably has a substantially circular annular cross section. The dimensions of the tubular portion are not limited, but the tubular portion preferably has a length of 100 to 8000 mm, more preferably 150 to 7000 mm, and further preferably 200 to 6000 mm. The tubular portion preferably has an outer diameter of 30 to 150 mm, more preferably has an outer diameter of 40 to 145 mm, and further preferably has an outer diameter of 45 to 140 mm. The tubular portion preferably has a thickness of 0.5 to 15.0 mm, more preferably 1.0 to 13.0 mm, and even more preferably 2.0 to 10.0 mm.

[0018] The tubular part 2 is formed of resin or rubber. The resin is not limited to, but preferably includes soft polyvinyl chloride resin, more preferably a combination of soft polyvinyl chloride resin and hard polyvinyl chloride resin. The resin is preferably flexible. The tubular part 2 may be made of resin and a spiral wire embedded in the resin. The rubber is not limited to, but is preferably natural rubber or synthetic rubber, more preferably synthetic rubber. It is preferable that the tubular portion 2 has flexibility. By having flexibility, when the through-hole is bent, it is possible to pass the communicating tube through it by following the bend. In addition, by packaging the tubular portion 2 in a bent state, it is possible to reduce the size of the tubular portion 2 for transportation. The tubular portion 2 is preferably elastic. By having elasticity, the tubular portion 2 can be installed according to the length of the through hole. In order to make the tubular portion 2 elastic, it is sufficient to make the tubular portion 2 bellows-shaped. However, when a flanged communicating pipe is made to order, the length of the through hole is measured on-site, and the length of the tubular portion is determined according to that length, and the flanged communicating pipe is produced, so the tubular portion 2 does not need to be elastic. The tubular portion 2 may be formed by using a so-called suction hose.

[0019] The first collar portion 3 extends from one end of the tubular portion 2 . The first flange 3 is formed of resin or rubber. The resin or rubber forming the first flange 3 is preferably flexible. The resin forming the first flange 3 is preferably a thermoplastic resin or a thermosetting resin. The thermoplastic resin is preferably, but not limited to, vinyl chloride resin, acrylic resin, or polyolefin resin, and more preferably, soft vinyl chloride resin. The thermosetting resin is preferably, but not limited to, unsaturated polyester resin, epoxy resin, or polyurethane resin. The rubber forming the first flange 3 may be either natural rubber or synthetic rubber, but is preferably synthetic rubber. The synthetic rubber is preferably, but not limited to, EPDM or urethane rubber. The first flange portion 3 must be foldable. Being foldable makes it easier to pass the flanged communicating pipe through the through hole. It is preferable that the first flange portion 3 can be made to have a size substantially equal to or smaller than the outer diameter of the tubular portion when folded. By making it possible to make the size substantially equal to or smaller than the outer diameter of the tubular portion, it becomes easier to pass the flanged communicating pipe through the through hole.

[0020] FIG. 3 shows the shape of one embodiment of the first flange portion 3. As shown in FIG. When a straight line extending from the center of gravity C1 of the figure constituting the inner circumference 3b of the first flange through the surface of the first flange to a point A1 on the outer circumference 3a of the first flange intersects with the inner circumference 3b of the first flange at point B1, the length L1 of the longest line segment A1B1 connecting points A1 and B1 is MAX is 250 mm, and the length L1 of the shortest line segment A1B1 connecting points A1 and B1 is MIN It is preferable that L1 is 15 mm. MAX More preferably, L1 is 220 mm, and even more preferably, 200 mm. MIN is more preferably 30 mm, and further preferably 50 mm. The length L1 of the line segment A1B1 connecting point A1 and point B1 is also referred to as the "length of the first flange" below. That is, the length L1 of the first flange is preferably 15 to 250 mm, more preferably 30 to 220 mm, and even more preferably 50 to 200 mm. By having the length L1 of the first flange within the above numerical range, an appropriate joint width can be ensured with the waterproof layer that is or will be pasted.

[0021] At least one of the first flange portion and the second flange portion preferably has a substantially circular or substantially rectangular outer peripheral shape and is shaped so that it can be passed through the through hole of the beam by being folded.

[0022] The shape of the first flange 3 is not limited, but preferably has a substantially circular outer periphery. By having a substantially circular outer periphery, it becomes easy to fold, and since the folded shape becomes simple, it becomes easy to pass the flanged communicating pipe through the through hole. In other words, the preferred shape of the first flange is a disk shape with a substantially circular center.

[0023] The first flange portion 3 preferably has an outer diameter of 60 to 650 mm, more preferably has an outer diameter of 130 to 500 mm, and further preferably has an outer diameter of 200 to 350 mm. The first flange portion 3 preferably has an inner diameter of 30 to 150 mm, more preferably has an inner diameter of 32 to 145 mm, and further preferably has an inner diameter of 35 to 140 mm. The difference between the outer diameter and the inner diameter of the first flange portion 3 is preferably 15 to 250 mm, more preferably 30 to 180 mm, and further preferably 80 to 120 mm. The first flange portion 3 preferably has a thickness of 0.5 to 5.0 mm, more preferably has a thickness of 1.0 to 2.5 mm, and further preferably has a thickness of 1.5 to 2.0 mm.

[0024] A second collar portion 4 extends from the other end of the tubular portion 2 . The second flange 4 is formed of resin or rubber. The resin or rubber forming the second flange 4 is preferably flexible. The resin forming the second flange 4 is preferably a thermoplastic resin or a thermosetting resin. The thermoplastic resin is preferably, but not limited to, vinyl chloride resin, acrylic resin, or polyolefin resin, and more preferably, soft vinyl chloride resin. The thermosetting resin is preferably, but not limited to, unsaturated polyester resin, epoxy resin, or polyurethane resin. The rubber forming the second flange 4 may be either natural rubber or synthetic rubber, but is preferably synthetic rubber. The synthetic rubber is preferably, but not limited to, EPDM or urethane rubber.

[0025] FIG. 4 shows the shape of one embodiment of the second flange portion 4. When a straight line extending from the center of gravity C2 of the figure constituting the inner circumference 4d of the second flange through the surface of the second flange to a point A2 on the outer circumference 4c of the second flange intersects with the inner circumference 4d of the second flange at point B2, the longest line segment A2B2 connecting points A2 and B2 is the length L2. MAX is 250 mm, and the length L2 of the shortest line segment A2B2 connecting points A2 and B2 is MIN It is preferable that L2 is 15 mm. MAX More preferably, L2 is 220 mm, and even more preferably, 200 mm. MIN is more preferably 30 mm, and further preferably 50 mm. The length L2 of the line segment A2B2 connecting point A2 and point B2 is hereinafter also referred to as the "length of the second flange." That is, the length L2 of the second flange is preferably 15 to 250 mm, more preferably 30 to 220 mm, and even more preferably 50 to 200 mm. By having the length L2 of the second flange within the above numerical range, an appropriate joint width can be ensured with the waterproof layer that is or will be pasted.

[0026] The shape of the second flange portion 4 is not limited, but the second flange portion 4 may have a substantially circular or substantially rectangular outer circumferential shape. The second flange 4 preferably has an upright portion 4a and a horizontal portion 4b, and has an L-shaped cross section when cut along a plane perpendicular to both the upright portion 4a and the horizontal portion 4b. By having an L-shape, when the flanged communicating pipe 1 is installed in a through hole in a beam on the roof, the upright portion 4a can be fixed to the rising side of the beam and the horizontal portion 4b can be fixed to the floor surface of the roof.

[0027] The upright portion 4a of the second flange preferably has a rectangular or square outer peripheral shape with a vertical length of 45 to 400 mm and a horizontal length of 60 to 650 mm, more preferably has a rectangular or square outer peripheral shape with a vertical length of 100 to 300 mm and a horizontal length of 100 to 500 mm, and even more preferably has a rectangular or square outer peripheral shape with a vertical length of 130 to 240 mm and a horizontal length of 200 to 400 mm. The horizontal portion 4b of the second flange portion preferably has a rectangular or square outer peripheral shape with a length perpendicular to the upright portion of 15 to 400 mm and a length parallel to the intersection line between the upright portion and the horizontal portion of 60 to 650 mm, more preferably with a rectangular or square outer peripheral shape with a length perpendicular to the upright portion of 100 to 300 mm and a length parallel to the intersection line between the upright portion and the horizontal portion of 100 to 500 mm, and even more preferably with a rectangular or square outer peripheral shape with a length perpendicular to the upright portion of 130 to 240 mm and a length parallel to the intersection line between the upright portion and the horizontal portion of 200 to 400 mm. The upright portion and horizontal portion of the second flange portion preferably have a thickness of 0.5 to 5.0 mm, more preferably 1.0 to 3.0 mm, and even more preferably 2.0 to 2.2 mm. When the second flange portion 4 has an upright portion 4a and a horizontal portion 4b, the tubular portion 2 is connected to the upright portion 4a.

[0028] The method for manufacturing the flanged communicating pipe 1 is not limited, but it can be manufactured as follows. When the tubular portion 2 is made of resin, it can be manufactured by extrusion molding of resin. Preferably, it is manufactured by extrusion molding using two kinds of resin, soft resin and hard resin. When extrusion molding two kinds of resin, while extruding the soft resin into a pipe shape, the hard resin is simultaneously extruded in a spiral shape from the side and integrated with the soft resin in the pipe shape. More preferably, it is manufactured by extrusion molding using two kinds of resin, soft polyvinyl chloride resin and hard polyvinyl chloride resin. When the tubular portion 2 is made of rubber, it can be manufactured by extruding natural rubber or synthetic rubber. When the first flange 3 is made of resin, the first flange 3 can be manufactured by vacuum molding the resin. When the first flange 3 is made of rubber, the first flange 3 can be manufactured by vacuum molding the rubber. When the second flange 4 is made of resin, it can be manufactured by vacuum forming or injection molding the resin. When the second flange 4 is made of rubber, it can be manufactured by vacuum forming or injection molding the rubber. When the tubular portion 2, the first flange portion 3, and the second flange portion 4 are each formed from resin, the tubular portion 2 and the first flange portion 3, and the tubular portion 2 and the second flange portion 4 are welded together using a dedicated solvent, and the ends are sealed with a polyvinyl chloride sealant to fill in any gaps, thereby manufacturing the flanged communicating pipe 1. When the tubular portion 2, the first flange portion 3, and the second flange portion 4 are each formed from rubber, the flanged communicating pipe 1 can be manufactured in the same manner as for resin.

[0029] The waterproof structure 10 for the roof of the inverted beam construction method of the present invention (II) is a waterproof structure 10 for the roof of a concrete building with a protruding beam 12 by the inverted beam construction method, in which a through hole 15 is provided to allow rainwater to flow from one side of the beam 12 to the other side, the flanged communicating pipe 1 of the present invention (I) is inserted into the through hole 15, the first flange 3 and the second flange 4 of the flanged communicating pipe 1 are fixed to the rising side surface 13 of the beam and the floor surface 11 of the roof, and a waterproof layer 14 is laid at least on the floor surface 11 of the roof and the rising side surface 13 of the beam. The first flange 3 may be disposed on one side of the beam 12 (i.e., the inflow side of the rainwater of the through hole 15) or on the other side of the beam 12 (i.e., the outflow side of the rainwater of the through hole 15), but preferably, the second flange 4 is disposed on one side of the beam 12 (i.e., the inflow side of the rainwater of the through hole 15).

[0030] The waterproof structure 10 for a roof using the reverse beam construction method according to the present invention (III) is a waterproof structure 10 for a roof of a concrete building with a protruding beam 12 using the reverse beam construction method, in which a through hole 15 is provided to allow rainwater to flow from one side of the beam 12 to the other side, and a flanged communicating pipe 1 is inserted into the through hole 15, and the flanged communicating pipe 1 has a tubular portion 2, a first flange portion 3 extending from one end of the tubular portion, and a second flange portion 4 extending from the other end of the tubular portion, and when the point at which a straight line extending from the center of gravity C1 of the figure constituting the inner circumference 3b of the first flange portion, passing through the surface of the first flange portion, to a point A1 on the outer circumference 3a of the first flange portion intersects with the inner circumference 3b of the first flange portion is defined as point B1, the longest line segment among the line segments A1B1 connecting points A1 and B1 has a length L1. MAX is 250 mm, and the length L1 of the shortest line segment A1B1 connecting points A1 and B1 is MIN is 15 mm, and the point at which a straight line extending from the center of gravity C2 of the figure constituting the inner circumference 4d of the second flange through the surface of the second flange to a point A2 on the outer circumference 4c of the second flange intersects with the inner circumference 4d of the second flange is defined as point B2. The length L2 of the longest line segment A2B2 connecting points A2 and B2 is MAX is 250 mm, and the length L2 of the shortest line segment A2B2 connecting points A2 and B2 is MIN is 15 mm, the tubular portion 2 is formed of resin or rubber, the first flange portion 3 and the second flange portion 4 are formed of flexible resin or rubber, the second flange portion 4 is fixed to one rising side surface 13a of the beam and to the floor surface 11 of the rooftop, the first flange portion 3 is fixed to the other rising side surface 13b of the beam and to the floor surface 11 of the rooftop, and a waterproof layer 14 is laid at least on the floor surface 11 of the rooftop and the rising side surfaces 13 of the beam.

[0031] The waterproof structure 10 for a roof using the reverse beam construction method of the present invention (IV) is a waterproof structure 10 for a roof of a concrete building with a protruding beam 12 using the reverse beam construction method, in which a through hole 15 is provided to allow rainwater to flow from one side of the beam 12 to the other side, and a flanged communicating pipe 1 is inserted into the through hole 15, and the flanged communicating pipe 1 has a tubular portion 2, a first flange portion 3 extending from one end of the tubular portion, and a second flange portion 4 extending from the other end of the tubular portion, and the first flange portion 3 has a substantially circular outer peripheral shape. The second flange 4 has an upright portion 4a and a horizontal portion 4b, the tubular portion 2, the first flange 3 and the second flange 4 are formed of flexible resin or rubber, the upright portion 4a of the second flange is fixed to one rising side 13a of the beam, the horizontal portion 4b of the second flange is fixed to the floor surface 11 of the roof, the first flange 3 is fixed to the other rising side 13b of the beam and the floor surface 11 of the roof, and a waterproof layer 14 is laid at least on the floor surface 11 of the roof and the rising side 13 of the beam.

[0032] The waterproof layer 14 is preferably, but not limited to, a synthetic polymer-based roofing sheet waterproof layer, an asphalt waterproof layer or a modified asphalt waterproof layer, or a coating waterproof layer. Synthetic polymer-based roofing sheet waterproof layers refer to PVC sheet waterproof layers and rubber sheet waterproof layers. An asphalt waterproof layer is a waterproof layer that is mainly constructed by applying asphalt roofing using a thermal method. A modified asphalt waterproof layer is a waterproof layer in which modified asphalt roofing is applied mainly using the torch method or adhesive method. The coating waterproof layer mainly refers to a urethane rubber-based coating waterproof layer and a rubber asphalt-based coating waterproof layer. The waterproof layer 14 is laid at least on the roof floor surface 11 and the upright sides 13 of the beams, but may also be laid on the top surfaces 16 of the beams.

[0033] The waterproofing method for a roof using the reverse beam construction method of the present invention (V) is a waterproofing method for the roof of a concrete building in which a beam 12 using the reverse beam construction method is protruding and a through hole 15 is provided so as to allow rainwater to flow from one side of the beam 12 to the other side, and the method includes the following steps: A step of preparing the flanged communicating pipe 1 of the present invention (I); a step of folding the first flange portion 3 of the flanged communicating pipe to a size that allows it to pass through the through hole 15, and fastening the folded portion with tape or tying with string; a step of inserting the flanged communicating pipe 1 into the through hole 15 with the folded first flange portion 3 first; a step of removing the tape or string after insertion to open the first flange portion 3; A process of attaching a waterproof layer 14 to the first flange 3 and the second flange 4 after fixing the first flange 3 and the second flange 4 to the rising side surface 13 of the beam and the floor surface 11 of the roof, or a process of attaching the first flange 3 and the second flange 4 to the waterproof layer 14 provided on the rising side surface 13 of the beam and the floor surface 11 of the roof. The present invention is characterized by comprising:

[0034] The waterproofing method for a roof using the reverse beam construction method of the present invention (VI) is a waterproofing method for the roof of a concrete building in which a beam 12 using the reverse beam construction method is protruding and a through hole 15 is provided so as to allow rainwater to flow from one side of the beam 12 to the other side, and the method includes the following steps: a step of preparing a flanged communicating pipe (1) having a tubular portion, a first flange portion extending from one end of the tubular portion, and a second flange portion extending from the other end of the tubular portion, the tubular portion being formed of resin or rubber, the first flange portion and the second flange portion being formed of resin or rubber, and the first flange portion being foldable; a step of folding the first flange portion 3 of the flanged communicating pipe to a size that allows it to pass through the through hole 15, and fastening the folded portion with tape or tying with string; a step of inserting the flanged communicating pipe 1 into the through hole 15 with the folded first flange portion 3 first; a step of removing the tape or string after insertion to open the first flange portion 3; A process of attaching a waterproof layer 14 to the first flange 3 and the second flange 4 after fixing the first flange 3 and the second flange 4 to the rising side surface 13 of the beam and the floor surface 11 of the roof, or a process of attaching the first flange 3 and the second flange 4 to the waterproof layer 14 provided on the rising side surface 13 of the beam and the floor surface 11 of the roof. The present invention is characterized by comprising:

[0035] In the process of folding the first flange portion 3 of the flanged communicating pipe to a size that can pass through the through hole 15 and fastening the folded portion with tape or tying with string, when folded to a size that can pass through the through hole 15, it is preferable to fold it to a dimension approximately the same as or smaller than the outer diameter of the tubular portion.

[0036] In the process of fixing the first flange portion 3 and the second flange portion 4 to the upright side surface 13 of the beam and the roof floor surface 11, if an existing casting drain or metal plate is present at the entrance / exit of the through hole 15, the first flange portion 3 and / or the second flange portion 4 are adhered to the existing casting drain or the sandwiched metal plate.

[0037] In the process of applying a waterproof layer to the first flange 3 and the second flange 4, if the waterproof layer is a synthetic polymer-based roofing sheet waterproof layer, it is preferable to melt-bond the first flange 3 and the second flange 4 to the synthetic polymer-based roofing sheet by heating or using a solvent. When the waterproof layer is an asphalt waterproof layer or a modified asphalt waterproof layer, it is preferable to treat the surfaces of the first flange portion 3 and the second flange portion 4 with an asphalt-based primer and then apply the asphalt waterproof layer or the modified asphalt waterproof layer. When the waterproof layer is a coating waterproof layer, it is preferable to apply the coating waterproof layer after treating the surfaces of the first flange portion 3 and the second flange portion 4 with a combination of a urethane-based primer and an acrylic urethane-based primer. [Industrial Applicability]

[0038] The flanged communicating pipe of the present invention can be suitably used for waterproofing the roof of a concrete building in which a beam protrudes using the reverse beam construction method and through holes are provided to allow rainwater to flow from one side of the beam to the other. [Explanation of symbols]

[0039] 1. Connecting pipe with flange 2 Tubular part 3. First flange 3a Outer circumference of the first flange 3b Inner circumference of the first flange 4 Second flange 4a Upright part 4b Horizontal part 4c Outer circumference of second flange 4d Inner circumference of second flange 10 Waterproof structure 11 Rooftop floor 12 Beam 13 Beam upright side 14 Waterproof layer 15 Through hole 16 Top of beam

Claims

1. A flanged communicating pipe is inserted for waterproofing purposes into a through hole provided on the roof of a concrete building, which allows rainwater to flow from one side of a beam protruding from the roof using a reverse beam construction method, the flanged communicating pipe having a tubular portion, a first flange portion extending from one end of the tubular portion, and a second flange portion extending from the other end of the tubular portion, the tubular portion being formed from resin or rubber, the first flange portion and the second flange portion being formed from resin or rubber, and the first flange portion being foldable.

2. Center of gravity C of the figure constituting the inner circumference of the first flange １ From the surface of the first flange to point A on the outer periphery of the first flange １ The point where the straight line to the first flange intersects with the inner circumference of the first flange is called point B. １ Then, point A １ and point B １ The length of the longest line segment connecting point A is 250 mm. １ and point B １ The length of the shortest line segment connecting the above is 15 mm, Center of gravity C of the figure constituting the inner circumference of the second flange ２ From the surface of the second flange to point A on the outer periphery of the second flange ２ The point where the straight line to the second flange intersects with the inner circumference of the second flange is called point B. ２ Then, point A ２ and point B ２ The length of the longest line segment connecting point A is 250 mm. ２ and point B ２ 2. The flanged communicating pipe according to claim 1, wherein the length of the shortest line segment among the line segments connecting the above is 15 mm.

3. 2. The flanged communicating pipe according to claim 1, wherein at least one of the first flange portion and the second flange portion has an outer peripheral shape that is substantially circular or substantially rectangular and can be folded to pass through the through hole of the beam.

4. 2. The flanged communicating pipe according to claim 1, wherein the resin or rubber forming the first flange and the second flange is flexible.

5. 2. The flanged communicating pipe according to claim 1, wherein the resin forming the first flange and the second flange is a thermoplastic resin or a thermosetting resin, and the rubber forming the first flange and the second flange is a synthetic rubber.

6. 6. The flanged communicating pipe according to claim 5, wherein the thermoplastic resin is a vinyl chloride resin, an acrylic resin or a polyolefin resin, the thermosetting resin is an unsaturated polyester resin, an epoxy resin or a polyurethane resin, and the synthetic rubber is an EPDM or a urethane rubber.

7. 2. The flanged communicating pipe according to claim 1, wherein the resin forming the first flange and the second flange is a soft polyvinyl chloride resin.

8. The flanged communicating pipe according to claim 1 , wherein the first flange portion has an outer circumferential shape that is substantially circular or substantially rectangular.

9. 2. The flanged communicating pipe according to claim 1, wherein the first flange portion has a substantially circular outer circumferential shape, an outer diameter of 60 to 650 mm, an inner diameter of 30 to 150 mm, and a thickness of 0.5 to 5.0 mm.

10. The flanged communicating pipe according to claim 1 , wherein the first flange portion can be folded to have an outer diameter substantially equal to or smaller than an outer diameter of the tubular portion.

11. 2. The flanged communicating pipe according to claim 1, wherein the second flange has an upright portion and a horizontal portion, and has an L-shaped cross section when cut along a plane perpendicular to both the upright portion and the horizontal portion.

12. The flanged communicating pipe according to claim 11, wherein the upright portion of the second flange has a rectangular or square outer peripheral shape with a vertical length of 45 to 400 mm and a horizontal length of 60 to 650 mm, and the horizontal portion of the second flange has a rectangular or square outer peripheral shape with a length perpendicular to the upright portion of 15 to 400 mm and a length parallel to the intersection line of the upright portion and the horizontal portion of 60 to 650 mm.

13. 12. The flanged communicating pipe according to claim 11, wherein the upright portion and the horizontal portion of the second flange have a thickness of 0.5 to 5.0 mm.

14. 2. The flanged communication pipe according to claim 1, wherein the tubular portion has a generally circular annular cross section.

15. 15. The flanged communicating pipe according to claim 14, wherein the tubular portion has a length of 100 to 8000 mm, an outer diameter of 30 to 150 mm, and a thickness of 0.5 to 15.0 mm.

16. 2. The flanged communicating pipe according to claim 1, wherein the tubular portion is made of a combination of soft polyvinyl chloride resin and hard polyvinyl chloride resin.

17. A waterproofing structure for the roof of a concrete building with protruding beams using the reverse beam construction method, in which a through hole is provided to allow rainwater to flow from one side of the beam to the other side, a flanged communicating pipe as described in claim 1 is inserted into the through hole, the first and second flanges of the flanged communicating pipe are fixed to the rising side of the beam and the floor surface of the roof, and a waterproofing layer is laid on at least the floor surface of the roof and the rising side of the beam.

18. A waterproofing structure for the roof of a concrete building with a protruding beam by the reverse beam construction method, in which a through hole is provided to allow rainwater to flow from one side of the beam to the other side, a flanged communicating pipe is inserted into the through hole, the flanged communicating pipe has a tubular portion, a first flange portion extending from one end of the tubular portion, and a second flange portion extending from the other end of the tubular portion, and the center of gravity C of a figure constituting the inner circumference of the first flange portion is １ From the surface of the first flange to point A on the outer periphery of the first flange １ The point where the straight line to the first flange intersects with the inner circumference of the first flange is called point B. １ Then, point A １ and point B １ The length of the longest line segment connecting point A is 250 mm. １ and point B １ The length of the shortest line segment among the line segments connecting the above is 15 mm, and the center of gravity C of the figure constituting the inner circumference of the second flange portion ２ From the surface of the second flange to point A on the outer periphery of the second flange ２ The point where the straight line to the second flange intersects with the inner circumference of the second flange is called point B. ２ Then, point A ２ and point B ２ The length of the longest line segment connecting point A is 250 mm. ２ and point B ２ a waterproof structure for a roof using a reverse beam construction method, in which the shortest line segment connecting the above is 15 mm long, the tubular portion is formed of resin or rubber, the first flange portion and the second flange portion are formed of flexible resin or rubber, the second flange portion is fixed to one rising side of the beam and to the floor surface of the roof, and the first flange portion is fixed to the other rising side of the beam and to the floor surface of the roof, and a waterproof layer is laid at least on the floor surface of the roof and the rising sides of the beam.

19. A waterproofing structure for the roof of a concrete building with protruding beams using the reverse beam construction method, wherein a through hole is provided to allow rainwater to flow from one side of the beam to the other side, a flanged communicating pipe is inserted into the through hole, the flanged communicating pipe has a tubular portion, a first flange extending from one end of the tubular portion and a second flange extending from the other end of the tubular portion, the first flange having a substantially circular outer peripheral shape, the second flange having an upright portion and a horizontal portion, the tubular portion, the first flange and the second flange being formed of flexible resin or rubber, the upright portion of the second flange is fixed to one rising side of the beam, the horizontal portion of the second flange is fixed to the floor surface of the roof, and the first flange is fixed to the other rising side of the beam and to the floor surface of the roof, and a waterproofing layer is laid on at least the floor surface of the roof and the rising side of the beam.

20. The waterproof structure for a roof using the inverted beam construction method according to claim 17, wherein the waterproof layer is a synthetic polymer-based roofing sheet waterproof layer, an asphalt waterproof layer or a modified asphalt waterproof layer, or a coating waterproof layer.

21. A waterproofing method for the roof of a concrete building in which a beam is protruding by a reverse beam construction method and a through hole is provided to allow rainwater to flow from one side of the beam to the other side, the method comprising the steps of: A step of preparing the flanged communicating pipe according to claim 1; a step of folding a first flange of the flanged communicating pipe to a size that allows the first flange to pass through the through hole, and fastening the folded portion with tape or tying with a string; inserting the flanged communicating pipe into the through hole with the folded first flange portion first; After insertion, removing the tape or string to open the first flange; and A process of attaching a waterproof layer to the first flange and the second flange after fixing the first flange and the second flange to the rising side surface of the beam and the floor surface of the roof, or a process of attaching the first flange and the second flange to the waterproof layer provided on the rising side surface of the beam and the floor surface of the roof. This includes waterproofing construction methods for roofs using the reverse beam method.

22. A waterproofing method for the roof of a concrete building in which a beam is protruding by a reverse beam construction method and a through hole is provided to allow rainwater to flow from one side of the beam to the other side, the method comprising the steps of: a step of preparing a flanged communicating pipe having a tubular portion, a first flange portion extending from one end of the tubular portion, and a second flange portion extending from the other end of the tubular portion, the tubular portion being formed of resin or rubber, the first flange portion and the second flange portion being formed of resin or rubber, and the first flange portion being foldable; a step of folding a first flange of the flanged communicating pipe to a size that allows the first flange to pass through the through hole, and fastening the folded portion with tape or tying with a string; inserting the flanged communicating pipe into the through hole with the folded first flange portion first; After insertion, removing the tape or string to open the first flange; and A process of attaching a waterproof layer to the first flange and the second flange after fixing the first flange and the second flange to the rising side surface of the beam and the floor surface of the roof, or a process of attaching the first flange and the second flange to the waterproof layer provided on the rising side surface of the beam and the floor surface of the roof. This includes waterproofing construction methods for roofs using the reverse beam method.

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