Drainage drain, drain structure, and construction method of drainage drain

Abstract

To provide a drainage drain which secures high waterproofness and which can reduce component cost and construction cost, and to provide a construction method of the same.SOLUTION: A drainage drain 100 mounted being connected to piping for draining accumulated water includes: a cylindrical part 1 directly connected to resin piping 300; and a flange part 2 integrally formed to a base end part 11 of the cylindrical part 1. A tip part 12 of the cylindrical part 1 is constituted so as to be welded and fixed with the piping 300 by an organic solvent O, and the flange part 2 can be welded and fixed with a resin waterproof sheet 200 by the organic solvent O.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a drain that is attached to a pipe to drain water that has accumulated in a structure such as a building. [Background technology]

[0002] Drainage structures are provided on the rooftops and balconies of buildings to drain rainwater and water used for cleaning to the outside. In general, drainage outlets are provided on floors where water tends to accumulate, and in corners between floors and walls such as parapets, and the water is drained to the outside via piping. A component called a drain is used for this drain, and the drain serves to provide a watertight connection between the drain and piping installed inside a structure such as a building.

[0003] When installing the aforementioned drainage drain, it is important to ensure that the floor surface and corners where the drain will be installed are waterproof, as well as the piping. If waterproofing is not ensured during construction, water leakage will occur, causing corrosion and deterioration of the building and other structural members. For this reason, it has become common to cover and secure the surface of the drain with a separate waterproof sheet made of soft resin, while fastening it to the piping using adhesive via a fitting, or by threading the piping.

[0004] For example, Patent Document 1 discloses an example in which a horizontal drain pipe made of fiber-reinforced resin (corresponding to the aforementioned "wastewater drain") is connected to a polyvinyl chloride drain pipe (corresponding to the aforementioned "piping") via an elbow-type fitting. More specifically, the horizontal drain pipe 800 of Patent Document 1 includes an L-shaped flange plate body 81 and a pipe body 82, as shown in Fig. 7. The flange plate body 81 and the pipe body 82 are made of fiber-reinforced resin using a soft resin as the matrix resin. The pipe body 82 is said to be connected to a polyvinyl chloride drain pipe. In addition, a glass fiber sheet is laid down with an adhesive so as to cover the flange plate main body 81, the floor and the wall, thereby preventing water from entering the gap between the flange plate main body 81 and the floor and the wall.

[0005] Although the details of the connection between the pipe body 82 and the PVC drain pipe and the joint are not mentioned, when connecting to a PVC drain pipe via an elbow joint as shown in FIG. 7, a method of applying adhesive and gluing and fixing is generally adopted. The inner diameter of piping joints, not limited to elbow types, is formed in a tapered shape, and when a PVC drain pipe is inserted, the pipe body of the joint is slightly elastically deformed and expanded. This repulsive force can reliably bring the outer diameter of the PVC drain pipe and the inner diameter of the joint into close contact. It is understood that the technology of Patent Document 1 also uses a similar effect to glue and fix the horizontal drain pipe 800 side. In addition, in the technology of Patent Document 1, the pipe body 82 is configured to taper, which is understood to be so arranged that it can be used with fittings of various inner diameters by being inserted to an appropriate depth depending on the inner diameter of the fitting and then tightly fixed in place.

[0006] Furthermore, Patent Document 2 discloses an example in which a horizontal roof drain (corresponding to the above-mentioned "wastewater drain") and a horizontal pipe (corresponding to the above-mentioned "piping") are connected with a screw. In more detail, as shown in FIG. 8, the roof drain 900 of Patent Document 2 is configured so that a sheet holding portion 93 that prevents a waterproof sheet 92 from floating is fixed to a main body portion 91 formed in an L-shape, and a strainer 94 is fixed to the sheet holding portion 93. The main body 91 is provided with a connecting portion 95 extending in a cylindrical shape, and the inner periphery of the connecting portion 95 is female-threaded. The connecting portion 95 is then screwed to a horizontal pipe 96 having an outer periphery with a male thread. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Utility Model Registration No. 3206461 [Patent Document 2] JP 2018-168659 A Summary of the Invention [Problem to be solved by the invention]

[0008] In the technology of Patent Document 1, waterproofing between the flange plate body and the glass fiber sheet, which is a waterproof sheet, is ensured by adhesive. Also, waterproofing between the pipe body 82 and the joint is ensured by adhesive. Adhesives bond by solidifying liquid synthetic resins, etc. When applied, they penetrate into the minute irregularities of the bonding surface, increasing the contact area, which in turn increases the intermolecular forces when solidified, resulting in strong adhesive power.

[0009] However, when fixing with adhesive, the synthetic resin that makes up the adhesive is merely interposed between the parts to be bonded, and if a force that exceeds the adhesive strength due to intermolecular forces is applied, the adhesive layer may peel off or break, making it impossible to ensure waterproofing. In particular, when applying adhesive to a large area such as a waterproof sheet, there is a possibility that a portion of the adhesive will peel off, causing the waterproof sheet to float and ripple, and the application of force to this portion may cause the peeling to progress. For this reason, when fixing a waterproof sheet by adhesion, a separate waterproof sheet retainer has traditionally been provided to improve waterproofing, as in Patent Document 2, but this has led to problems such as increased manufacturing and construction costs.

[0010] Furthermore, when connecting the wastewater drain to the pipe via a joint, there is the problem that waterproofing is reduced by the adhesive, and construction costs increase due to the cost of the joint parts and the labor required for construction. On the other hand, in Patent Document 2, the drain and the pipe are directly connected without a joint. However, when fixing with screws, the work of threading the drain and the pipe increases. In addition, there is a concern that water may leak from gaps when using only screws, so a sealant must be used in combination, which increases the cost of construction in addition to the cost of processing the parts.

[0011] The present invention has been made in consideration of the above-mentioned problems, and its object is to provide a drainage drain, a drainage structure, and a construction method thereof that ensure high waterproofing while reducing parts and construction costs. [Means for solving the problem]

[0012] The means adopted by the present inventors to solve the above problems will be described below. The drain of the present invention is a drain that is attached to a pipe in order to drain rainwater, water used for cleaning, etc., that accumulates in a structure such as a building. The drain of the present invention includes a cylindrical portion that is directly connected to a resin pipe, and a flange portion that is integrally formed with the base end of the cylindrical portion.

[0013] The tip of the cylindrical portion is configured so as to be weldable and fixed to the pipe by an organic solvent, and the flange portion is configured so as to be weldable and fixed to a waterproof resin sheet by an organic solvent.

[0014] Since the cylindrical portion is configured to be weldable to the pipe with an organic solvent, when the pipe is applied with an organic solvent and brought into contact with the pipe, the material of the pipe and the material of the cylindrical portion melt and are bonded together with a portion of the surface being mixed together. When the materials are bonded together in a mixed state, an intermolecular force for bonding acts within the volume of the mixture. On the other hand, in the case of adhesion with an adhesive, the intermolecular force for bonding acts only on the surfaces where the materials and the synthetic resin of the adhesive are in contact with each other. As described above, in the configuration of the present invention, the range in which the intermolecular forces for bonding act is larger than in the case of bonding using an adhesive, so that strong bonding can be achieved.

[0015] The flange portion can also be configured to be welded and fixed with an organic solvent. By making the flange portion and the resin waterproof sheet weldable with an organic solvent, the flange portion and the waterproof sheet can be bonded more firmly than when they are bonded with an adhesive.

[0016] As described above, the drain of the present invention is configured such that the tip of the tubular part can be welded and fixed to the pipe by an organic solvent, and the flange part can be welded and fixed to the resin waterproof sheet by an organic solvent. With this configuration, the waterproof sheet, the drain, and the pipe are firmly bonded and integrated by using an organic solvent for construction. Therefore, even if an external force is applied during and after construction, the joints will not peel off or break, resulting in a loss of waterproofness.

[0017] In addition to the above means, the means adopted by the present invention to solve the above-mentioned problems can also be formed as a seamless, integrated unit of the tubular portion and the flange portion using a sheet material of rigid polyvinyl chloride resin. In the above-mentioned means, the manufacturing method of the tubular portion and the flange portion is not important so long as they are seamlessly formed as a single unit using a sheet material of rigid polyvinyl chloride resin. As an example, a method of forming them seamlessly as a single unit by vacuum molding can be used.

[0018] The term "hard" in the rigid polyvinyl chloride resin in the present invention corresponds to the hardness of "rigid polyvinyl chloride pipe" described in JIS K6741.

[0019] The cylindrical portion and the flange portion are seamlessly formed as one piece with the sheet material, so there are no uneven parts or joints that are likely to reduce strength. This reduces the possibility of the material breaking and losing its waterproofing when force is applied. In addition, by using rigid polyvinyl chloride resin as the material for the sheet material, not only does the resin itself have high strength, but it also improves the weldability with organic solvents to pipes and waterproof sheets that are generally made of polyvinyl chloride resin. In other words, because the same type of material melts, mixes and bonds, it can be bonded more firmly than when dissimilar materials are welded together.

[0020] As another means adopted by the present invention to solve the above-mentioned problems, it is possible to form the tubular portion into a tapered shape in which the diameter gradually decreases from the base end to the tip end, so that the tip end is smaller than the inner diameter of the piping and the base end is larger than the inner diameter of the piping.

[0021] By forming the cylindrical portion into a tapered shape so that the tip end is smaller than the base end, when the cylindrical portion is inserted into a general pipe having parallel tubes, the ridges of the tapered tip end of the cylindrical portion come into strong contact with the inner wall of the pipe. When the ridges come into strong contact, the cylindrical portion elastically deforms slightly inward, and the repulsive force brings the cylindrical portion into close contact with the inner wall of the pipe with no gaps, and the portion melted by the organic solvent is tightly fixed in place with no gaps. As a result, during installation, reliable waterproofing and strength can be obtained simply by inserting the cylindrical portion into the piping.

[0022] As another means of the present invention, a drainage structure for draining accumulated water can be configured to include the above-mentioned drainage drain, a resin waterproof sheet that covers the drainage drain watertightly, and piping that is connected to the drainage drain watertightly, wherein the flange portion of the drainage drain and the waterproof sheet are welded together using an organic solvent, and the tubular portion of the drainage drain and the piping are welded together.

[0023] With the above drainage structure, the waterproof sheet, drainage drain, and piping are fused and fixed with an organic solvent, so they are firmly bonded together and integrated. By fusion-integrating the three, the drainage structure as a whole has high strength, so it can maintain its waterproof performance for a long time even after construction.

[0024] On the other hand, in the present invention, it is also possible to adopt a method for constructing the above-mentioned drainage drain, which includes the following steps. First, the construction method of the drainage drain of the present invention includes an adhesive application step of applying an adhesive to the flange portion or the mounting target portion, and a first solvent application step of applying an organic solvent to the cylindrical portion. It does not matter which of the adhesive application step and the first solvent application step is performed first.

[0025] Next, following the adhesive application step and the first solvent application step, the method includes a welding attachment step of inserting the tubular portion into the pipe and welding-fixing it thereto, and abutting the flange portion against an attachment target portion to attach it thereto. In the welding attachment process, welding of the cylindrical portion to the pipe and attachment of the flange portion to the attachment target portion may be performed simultaneously, or either may be performed first. Also, the attachment of the flange portion to the attachment target portion is not limited to a specific means, but examples include fixing with an adhesive or fixing with screws.

[0026] Next, the welding attachment step is followed by a second solvent application step of applying an organic solvent to the surface of the flange portion or the back surface of a waterproof sheet made of soft polyvinyl chloride resin. Finally, the second solvent application step is followed by a sheet welding step of covering the surface of the flange portion with the waterproof sheet and welding and fixing it thereto.

[0027] The drainage drain construction method of the present invention has a first solvent application step and a second solvent application step, and thus the waterproof sheet, the drainage drain, and the piping are firmly bonded and integrated. Therefore, even if an external force is applied during or after construction, the joints will not peel off or break, and the waterproofing will not be lost. Effect of the Invention

[0028] As described above, the drain of the present invention includes a cylindrical portion and a flange portion that can be welded and fixed by an organic solvent, and thus can be integrated more firmly than when they are bonded by an adhesive. In particular, the cylindrical portion and the pipe can be welded together without using a joint. Furthermore, the construction method for installing the drainage drain having the above-mentioned configuration includes a first solvent application step and a second solvent application step using an organic solvent, so that the construction can be easily carried out without risking loss of waterproofing. As a result, the present invention has the effect of ensuring high waterproofing while reducing component costs and installation costs. [Brief description of the drawings]

[0029] [Figure 1] 1A and 1B are perspective and cross-sectional views showing a wastewater drain of the present invention. [Diagram 2] FIG. 2 is an explanatory diagram showing a method for manufacturing a wastewater drain according to the present invention. [Diagram 3] 2 is a flowchart showing a construction method for a wastewater drain of the present invention. [Figure 4] FIG. 2 is an explanatory diagram showing a construction method of the drainage drain of the present invention. [Diagram 5] 1A and 1B are a perspective view and a cross-sectional view showing a first modified example of a drainage drain of the present invention. [Figure 6] 11A and 11B are a perspective view and a cross-sectional view showing a second modified example of a drainage drain according to the present invention. [Figure 7] FIG. 1 is a perspective view showing a first conventional example of a wastewater drain. [Figure 8] FIG. 1 is a cross-sectional view showing a second conventional example of a wastewater drain. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0030] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. It should be noted that each drawing is drawn diagrammatically for the purpose of explanation, and some dimensions and shapes are shown exaggerated or simplified.

[0031] The drainage drain 100 shown in Fig. 1 is a so-called horizontal drain that is attached to a corner between a floor surface F on the roof of a building, which is the part to be attached, and a wall surface W such as a parapet. The drainage drain 100 comprises a cylindrical part 1 that is directly connected to a piping 300 made of polyvinyl chloride resin, and a flange part 2 that is integrally formed with a base end part 11 of the cylindrical part 1. The floor surface F and wall surface W of the building, which are the part to be attached, can be made of various materials such as wood or concrete.

[0032] In the embodiment shown in FIG. 1, the cylindrical portion 1 is a thin-walled trapezoidal cone that is tapered so that the diameter of the tip end 12 is slightly smaller than that of the base end 11 . The flange portion 2 is in the form of a thin plate and has an L-shaped cross section consisting of a first surface 21 parallel to the floor surface and a second surface 22 parallel to the wall surface. An opening 23 communicating with the cylindrical portion 1 is provided at the boundary between the second surface 22 and the base end portion 11 of the cylindrical portion 1. The cylindrical portion 1 and the flange portion 2 are both formed to have approximately the same thickness, which is approximately 3 mm in the embodiment shown in FIG. 1, but the thickness can be appropriately selected.

[0033] The larger the area of ​​each of the first surface 21 and the second surface 22 of the flange portion 2, the larger the adhesion area with the floor surface F or the wall surface W and the welding area with the waterproof sheet 200 can be, and the width and depth are preferably twice the diameter of the opening 23, and more preferably three times the diameter of the opening 23. In the embodiment of Fig. 1, the first surface 21 and the second surface 22 are three times the width and twice the depth of the opening 23.

[0034] Holes 24 of a predetermined size are provided at the four corners of the first surface 21 and the second surface 22 of the flange portion 2. These holes 24 are holes for inserting wood screws or the like that will be directly fastened to the mounting target portion when the drain 100 is installed.

[0035] The drainage drain 100 having the above-mentioned shape is entirely made of hard polyvinyl chloride resin, and the tip 12 of the cylindrical portion 1 can be welded and fixed to the pipe 300 by an organic solvent O. In addition, the flange portion 2 can be welded and fixed to a waterproof sheet 200 made of soft polyvinyl chloride resin, which will be described later, by an organic solvent O.

[0036] The wastewater drain 100 in the form shown in FIG. 1 can be manufactured, for example, by vacuum forming as shown in FIG. First, as shown in FIG. 2(a), a sheet-shaped hard polyvinyl chloride resin sheet S is placed directly above a mold M while being heated. Next, as shown in Fig. 2(b), air is sucked in through the numerous air inlets V·V… provided on the mold M, and the rigid PVC resin sheet S is lowered to cover the mold M. Then, the rigid PVC resin sheet S, which has been softened by heating, is stretched and deformed to the shape of the mold M by the reduced pressure caused by the air sucked in through the air inlets V·V…. Finally, as shown in FIG. 2(c), the cooled molded product S' is removed from the mold M, and as shown in FIG. 2(d), the outer periphery, the holes 24·24..., and the tip 12 of the tubular portion 1 are punched out with a punching die D to obtain the drainage drain 100.

[0037] The drainage drain 100 manufactured by the above manufacturing method can have a structure in which the cylindrical portion 1 and the flange portion 2 are seamlessly formed as a single unit. In addition, since they can be manufactured in a single unit by vacuum forming, the cost of parts can be reduced.

[0038] Next, a method of constructing the drain 100 of FIG. 1 will be described with reference to FIGS. First, as a preliminary step, it is advisable to insert the tip 12 of the cylindrical part 1 into the piping 300 and provide a marking on the cylindrical part 1 so that the boundary between the cylindrical part 1 and the piping 300 can be identified when the tip 12 is firmly inserted (not shown). Note that this step is not essential, and another method can be used, such as providing a mark on the cylindrical part 1 in advance when the wastewater drain 100 is formed.

[0039] Next, in the adhesive application step, as shown in Fig. 4(a), adhesive G is applied to the flange portion 2 or the attachment target portions, that is, the floor surface F and the wall surface W. Various adhesives can be used in this step depending on the material of the attachment target portion, but flexible adhesives such as rubber-based adhesives are preferred so that they can penetrate finely uneven surfaces and improve adhesion. In addition, when applying the coating, it is preferable to use a method of applying with an oil pump, or to spread the coating to an even thickness without gaps using a spray, spatula, or the like.

[0040] Next, in the first solvent application step, an organic solvent O is applied to the cylindrical portion 1 as shown in Fig. 4(b). The organic solvent O used in this step may be any of various types such as aromatic hydrocarbons, ketones, and esters, as long as it has the property of dissolving resins, particularly vinyl chloride resins, well. However, it is preferable to use a solvent having a viscosity that does not easily drip after application, such as a second type organic solvent mainly composed of acetone, cyclohexane, or methyl ethyl ketone. In addition, in applying the composition, various methods can be used, such as applying the composition with a brush or applying the composition by soaking the composition into a fabric.

[0041] The adhesive application step and the first solvent application step described above may be performed in any order, however, since it is better to bond the rubber-based adhesive G after the solvent has evaporated somewhat and the adhesive G has become elastic, and since the organic solvent O is also easily evaporated, it is preferable to perform the adhesive application step first and the first solvent application step afterwards.

[0042] Next, in the welding and mounting process which is carried out following the adhesive application process and the first solvent application process, as shown in Figure 4(c), the tubular portion 1 is inserted into the piping 300 and fixed by welding, and the flange portion 2 is abutted against the floor surface F and wall surface W, which are the mounting targets, and attached.

[0043] When inserting the cylindrical portion 1 into the piping 300, the cylindrical portion 1 is firmly pushed into the piping 300 up to the marking provided at a predetermined position on the cylindrical portion 1 before the applied organic solvent O evaporates, and is held there for a predetermined period of time. At this time, since the cylindrical portion 1 is tapered, when it is inserted into the pipe 300, which is a parallel pipe, the ridge of the tip portion 12 of the cylindrical portion 1 is pressed into contact with the inner wall of the pipe 300, and the tip portion 12 is elastically deformed slightly inward. The repulsive force caused by this deformation causes the outer diameter portion of the tip portion 12 to adhere closely to the inner wall of the pipe 300 and to be welded.

[0044] When the flange portion 2 is brought into contact with the floor surface F or wall surface W to which it is to be attached, it is pressed so that the applied adhesive G is firmly adhered, and is held in that state for a predetermined period of time. Here, by inserting wood screws (not shown) into holes 24-24... provided in flange portion 2 and fixing it, there is no need to hold it down until adhesive G is completely hardened, and it is possible to prevent the drainage drain 100 from floating up even after hardening. In this case, by using flat head screws, the screw heads do not protrude from flange portion 2, so it is possible to prevent unevenness when welding and fixing waterproof sheet 200.

[0045] In the welding and mounting process, it does not matter whether the tubular portion 1 is welded and fixed to the piping 300 or the flange portion 2 is attached to the mounting target portion first; however, since the organic solvent O is easily volatilized, it is preferable to weld and fix the tubular portion 1 to the piping 300 first.

[0046] Next, in the second solvent application process carried out following the welding attachment process, an organic solvent O is applied to the surface of the flange portion 2 or the back surface of the waterproof sheet 200, as shown in Fig. 4(d). The organic solvent O used in this process may be the same as that used in the first solvent application process, but a solvent with low viscosity may be used so that it can be quickly spread over a wide area before it evaporates. For example, a second organic solvent mainly composed of tetrahydrofuran or methyl ethyl ketone is preferable, which has a low viscosity so that it can be soaked into a brush or directly sprayed with an oiler. Incidentally, here, adhesive G is applied to the portions of the floor surface F and the wall surface W adjacent to the flange portion 2.

[0047] In the sheet welding step which is carried out last, as shown in FIG. 4(e), following the second solvent application step, a waterproof sheet 200 is covered on the surface of the flange portion 2 and fixed by welding. The covered waterproof sheet 200 is held in place for a predetermined period of time, taking care not to cause wrinkles or ripples in the sheet. The waterproof sheet 200 is cut into a circular shape to fit the opening 23 of the flange portion 2, and the borders are terminally treated with a sealant to enhance waterproofing and prevent the waterproof sheet 200 from curling up or tearing.

[0048] The drainage structure constructed by the above process is firmly integrated by welding the waterproof sheet 200, the drainage drain 100, and the piping 300 together with the organic solvent O. By fusion-integrating the three, the drainage structure as a whole has high strength, and the waterproof performance can be maintained for a long period of time even after construction. If necessary, a strainer can be installed to prevent foreign matter such as fallen leaves from entering the piping 300 and clogging it.

[0049] 『Variation 1』 The present invention is not limited to the above-mentioned embodiment, and other embodiments may be adopted. For example, the drainage drain 101 shown in Fig. 5 is a so-called vertical drain that is attached to the middle of the floor surface F of the roof of a building, which is the attachment target. The drainage drain 101 includes a cylindrical part 1 that is directly connected to a polyvinyl chloride resin pipe 300, and a flange part 2 that is integrally formed with a base end part 11 of the cylindrical part 1, but the flange part 2 is composed only of a first surface 21 that is parallel to the floor surface F, and does not have holes for fixing with screws, which is different from the embodiment shown in Fig. 1.

[0050] The form of Fig. 5 can be manufactured by the same method as the manufacturing method shown in Fig. 2, but it can also be manufactured by injection molding or lathe processing. The construction method of the wastewater drain 101 of Fig. 5 is the same as the method of Figs. 3 and 4.

[0051] 『Variation 2』 In the present invention, other configurations may also be adopted. For example, a wastewater drain 102 shown in Fig. 6 is a horizontal drain similar to that shown in Fig. 1, but differs in that the tip 12 of the cylindrical portion 1 has a stepped structure having a large diameter portion 13 and a small diameter portion 14. The rigid polyvinyl chloride pipe that is the piping 300 can be one that is standardized by JIS K 6741, but in structures such as buildings, it is common to use pipes with a diameter of 50 mm or 75 mm according to this standard. However, pipes with diameters other than these may also be used.

[0052] However, if the cylindrical portion 1 is sized to match any diameter of the pipe 300, multiple types of drains must be prepared depending on the design of the structure, resulting in increased parts costs and management costs. Therefore, in this modification, the tip portion 12 of the cylindrical portion 1 has a stepped structure having a large diameter portion 13 adapted to a pipe with a diameter of 75 mm and a small diameter portion 14 adapted to a pipe with a diameter of 50 mm.

[0053] In constructing the wastewater drain 102, when the pipe 300 has a diameter of 50 mm, the organic solvent O is applied to the small diameter portion 14 and then inserted into the pipe 300. On the other hand, when the pipe 300 has a diameter of 75 mm, the small diameter portion 14 is cut off, and the large diameter portion 13 is coated with organic solvent O and inserted into the pipe 300. At this time, if the large diameter portion 13 is inserted into the pipe 300 without cutting off the small diameter portion 14, the drainage flow path will be narrowed by the small diameter portion 14, and depending on the building, there is a risk that the construction standards will not be met, so care must be taken.

[0054] As described above, the drain of the present invention ensures high waterproofing while reducing component and construction costs, and can be used for a variety of drainage structures, including not only rooftops and balconies of buildings, but also indoor water-related drainage structures, outdoor fountain facilities and drinking water facilities, roadside drainage facilities, and the like. [Explanation of symbols]

[0055] 100,101,102 Drain 1. Cylindrical part 11 Proximal end 12 Tip 13 Large diameter section 14 Small diameter section 2 Flange 21 First Side 22 The Second Side 23 Opening 24 holes 200 Tarpaulin 300 Piping G. Adhesive M mold O Organic solvent S Hard polyvinyl chloride resin sheet S' Molded product V Intake

Claims

1. In drainage drains, which are attached to pipes to drain accumulated water, A cylindrical portion that is directly connected to a resin pipe; a flange portion integrally formed at a base end of the cylindrical portion, The tip of the cylindrical portion is configured to be welded and fixed to the pipe by an organic solvent, A drainage drain, characterized in that the flange portion is configured to be able to be welded and fixed to a resin waterproof sheet using an organic solvent.

2. 2. The drain according to claim 1, wherein the cylindrical portion and the flange portion are seamlessly and integrally formed from a sheet material of hard polyvinyl chloride resin.

3. The cylindrical portion is formed in a tapered shape in which the diameter gradually decreases from the base end to the tip end, 3. The drain according to claim 1, wherein the tip portion is smaller than an inner diameter of the pipe, and the base portion is larger than an inner diameter of the pipe.

4. A drainage structure for draining accumulated water, comprising: the drainage drain according to claim 1; a resin waterproof sheet for covering the drainage drain in a watertight manner; and a pipe connected to the drainage drain in a watertight manner; The flange portion of the drainage drain and the waterproof sheet are welded and fixed together with an organic solvent, A drainage structure, characterized in that the cylindrical portion of the drainage drain and the piping are fixed integrally by welding.

5. A method for constructing the drainage drain according to claim 1, an adhesive application step of applying an adhesive to the flange portion or the attachment target portion; a first solvent application step of applying an organic solvent to the cylindrical portion; a welding attachment step of inserting the cylindrical portion into the pipe and welding and fixing the cylindrical portion to the pipe subsequent to the adhesive application step and the first solvent application step, and abutting the flange portion against an attachment target portion to attach the flange portion to the pipe; a second solvent application step of applying an organic solvent to the surface of the flange portion or the back surface of the waterproof sheet made of soft polyvinyl chloride resin following the welding and mounting step; A method for constructing a drainage drain, comprising a sheet welding step of covering the waterproof sheet on the surface of the flange portion and welding and fixing it thereto, subsequent to the second solvent application step.

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