JP2018012916A - Roof drain, strainer for roof drain, and manufacturing method of strainer for roof drain - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a roof drain, a strainer for the roof drain, and a manufacturing method of the strainer for the roof drain that prevent more reliably inflow into a gutter pipe of a minute waste that can pass through an opening in a grid part of a strainer, and enable such minute waste to be cleaned readily without interrupting drainage in the gutter pipe.SOLUTION: A roof drain 1 of the present invention has a water permeable part 24 formed at an opening 21 of a grid part 22 of a strainer 20, the water permeable part having an aggregate 23 bonded with an adhesive. As such, the roof drain 1 is capable of preventing inflow into a gutter pipe of a minute waste that has passed through the opening 21, with the water permeable part 24. Since the water permeable part 24 is formed at the opening 21 of the grid part 22, wastes that accumulate on the water permeable part 24 may be removed readily.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a roof drain, a roof drain strainer, and a method of manufacturing a roof drain strainer used for drainage means provided on a rooftop of a building, a floor such as a veranda.

  Roof drains are usually installed on the rooftops of buildings and on the verandas of condominiums to allow rainwater to flow through the pipes. As a general thing, this roof drain is comprised by the saucer part connected with a soot pipe, and the strainer fixed to a saucer part.

  This strainer is made of cast or stainless steel, but each has a lattice part, so that leaves and dust are dammed up in the lattice part so that rainwater etc. flows from the opening of the lattice part to the pipe. It has become.

  By the way, recently, plant cultivation on the roof of buildings and verandas of condominiums has been actively performed, so a lot of fine earth and sand has accumulated on the roofs and floors of verandas. Also, due to the influence of yellow sand, a lot of fine earth and sand accumulates on the rooftop and veranda floor. Most of such fine earth and sand flows up to the roof drain together with rain water and the like, but most of the earth and sand is not blocked by the lattice part, and flows into the vertical pipe through the opening of the lattice part.

  In addition to earth and sand, various garbage such as human and animal hairs, bird feathers, plant seeds, etc. will flow into the tub. For this reason, there is a known problem that fine dust such as earth and sand that has flowed into the soot pipe through the lattice portion opening of the strainer accumulates at the joining portion of the soot pipe, the soot outlet, and the like.

  As described in Patent Documents 1 and 2, with respect to such a problem of fine dust accumulation in the pipe, a wire mesh-like object is installed between the tray portion and the strainer. A roof drain that collects fine trash is known.

JP 2000-64526 A Registered Utility Model No. 3057964

  However, in the configuration using the wire mesh described in Patent Documents 1 and 2, if the mesh is large, most of fine dust passes, and if the mesh is too small, the flow of rainwater and the like is poor. Therefore, it is difficult to select an appropriate wire mesh because there is a risk of hindering drainage in the pipe during a local heavy rain.

  Moreover, although it is necessary to clean the dust collected in the wire mesh from time to time, a wire mesh that can be used in a roof drain may be deformed by this cleaning or the like, so that the wire mesh is difficult to use for a long time. Also, the strainer must be removed from the tray each time the wire mesh is cleaned, and the wire mesh is difficult to clean. In addition, when the wire mesh is caught by fibrous dust such as hair or animal hair, it is difficult to clean the wire mesh.

  Therefore, the present invention can more reliably prevent the inflow of fine dust that passes through the strainer opening of the strainer into the soot pipe, and can prevent such fine dust from flowing without disturbing drainage in the soot pipe. An object of the present invention is to provide a roof drain that can be easily cleaned, a roof drain strainer, and a method of manufacturing a roof drain strainer.

  In order to achieve the above object, the present invention provides a roof drain comprising a tray part connected to a soot tube and a strainer in which a grid part is formed and fixed to the tray part, wherein the opening of the grid part of the strainer is provided. In addition, a water permeable portion in which a plurality of aggregates are fixed with an adhesive is formed.

  According to the roof drain of the present invention, since the water permeable portion is formed, it is possible to prevent inflow of fine dust that has conventionally passed through the opening into the pipe. Moreover, since the water permeable part is formed in the opening of the lattice part, the dust accumulated in the water permeable part can be easily removed.

  The roof drain according to the present invention is characterized in that the water-permeable portion is formed from the inside of the strainer.

  According to the roof drain of the present invention, since the water permeable portion is inside the strainer, the lattice of the lattice portion of the strainer can be visually recognized, so that the aesthetic appearance of the strainer is not impaired. Moreover, since a water-permeable part can be formed thinly compared with the case where a water-permeable part is formed in the outer side of a strainer, high water permeability can be ensured.

  The roof drain of the present invention is characterized in that the adhesive is Fine Fiber (registered trademark) of Fine Chemicals Co., Ltd.

  According to the roof drain of the present invention, a water-permeable portion having sufficient water permeability and durability can be formed.

  Further, the strainer for roof drain according to the present invention is a strainer for roof drain formed with a lattice portion and fixed to a tray portion constituting the roof drain, and a plurality of aggregates are fixed to the opening of the lattice portion with an adhesive. A water permeable portion is formed.

  By using the roof drain strainer of the present invention with respect to a roof drain that is already used on the roof of a building or the like, the same effect as that of the roof drain can be obtained.

  The roof drain strainer manufacturing method of the present invention is a roof drain strainer manufacturing method in which a lattice portion is formed and fixed to a tray portion constituting the roof drain, the cleaning step of cleaning the lattice portion surface, A primer application step for applying a primer to the cleaned surface of the lattice portion, a kneading step for mixing the aggregate and the adhesive, and a filling step for filling the kneaded material in the kneading step into the opening of the lattice portion. It is characterized by that.

  According to the method for manufacturing a strainer for roof drain according to the present invention, a strainer for roof drain that can exhibit the above-described effect with respect to an existing strainer for roof drain can be easily manufactured.

FIG. 1A is a plan view of a roof drain according to the first embodiment, and FIG. 1B is a cross-sectional view taken along the line IB-IB in FIG. 2A is a cross-sectional view of the strainer in the cross-sectional view shown in FIG. 1B, and FIG. 2B is a plan view of the water permeable plate according to the first embodiment. It is a manufacturing drawing of the strainer concerning Embodiment 1. FIG. 4A is an exploded photograph of the roof drain of Embodiment 1, FIG. 4B is an assembled photograph of this roof drain, and FIG. 4C is a photograph showing the water permeability of this roof drain. FIG. 5A is a side view of the roof drain according to the second embodiment, and FIG. 5B is a front view of the strainer according to the second embodiment.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described with reference to the embodiments and drawings. However, the embodiments shown below are not intended to limit the present invention to those described herein, and The invention can be equally applied to various modifications without departing from the technical idea shown in the claims. In addition, in each drawing used for the description in this specification, in order to make each member a size that can be recognized on the drawing, each member is displayed with a different scale, and is not necessarily actual. It is not displayed in proportion to the dimensions.

[Embodiment 1]
The configuration of the roof drain 1 according to the embodiment of the present invention will be described with reference to FIG. 1A is a plan view of the roof drain 1, and FIG. 1B is a cross-sectional view taken along the line IB-IB in FIG. 1A. Note that in the cross-sectional view of FIG. 1B, the depth direction in the drawing is omitted for easy understanding, and the same applies to drawings showing other cross sections.

  The roof drain 1 includes a tray portion 10 and a strainer 20. The saucer portion 10 is embedded in the roof of a building or on the floor of a veranda, and is a cast part made up of a cylindrical lower portion 11 and a circular dish-like upper portion 12. The cylindrical lower part 11 is connected to a soot pipe (not shown) embedded in the floor. The dish-like upper portion 12 includes a circular hole 12a, a flange 12b around the circular hole 12a, two screw holes (not shown) for fixing the strainer 20 on the upper surface of the flange 12b, and a plurality of protrusions that regulate the position of the strainer 20. 12c.

  In the present embodiment, the tray portion 10 is shown as one component in which the cylindrical lower portion 11 and the dish-shaped upper portion 12 are integrated. However, the cylindrical lower portion 11 and the dish-shaped upper portion 12 are different from each other. You may be the structure.

  The strainer 20 is an upside down bowl-shaped (dome-shaped) casting part located on the bowl 12 b of the tray part 10. In the strainer 20, a plurality of regular openings 21 are provided on the upper surface 20a and the side surface 20b, and a lattice portion 22 is formed. Further, the strainer 20 is formed with two screw holes (not shown) in the lower edge 20c of the side surface 20b, and the strainer 20 is fixed to the tray part 10 by screws 30 together with the screw holes and the screw holes of the dish-like upper part 12. Is done.

  The roof drain 1 itself composed of the tray portion 10 connected to the soot tube and the strainer 20 formed with the lattice portion 22 and fixed to the tray portion 10 is the same as a conventionally known roof drain. In the roof drain 1 of the present embodiment, the tray portion 10 and the strainer 20 are made of casting, but may be made of a material other than casting, such as stainless steel.

  And the roof drain 1 of this embodiment becomes the structure by which the water permeable part 24 which fixed the some aggregate 23 with the adhesive agent was further formed in the opening 21 of the grating | lattice part 22 with respect to the conventionally known roof drain. ing. FIG. 2 (A) shows a cross-sectional view of the strainer 20 in the cross-sectional view of the roof drain 1 shown in FIG. 1 (B).

  The water permeable part 24 allows the water flowing on the roof of the building or the floor of the veranda to pass therethrough, and keeps fine dust such as earth and sand flowing along with the water from flowing to the vertical pipe connected to the tray part 10. .

  And by forming the water permeable part 24 in the opening 21 of the lattice part 22, the roof drain 1 can prevent the inflow of fine dust that has conventionally passed through the opening 21 into the tub. Become. Moreover, since the water permeable part 24 is formed in the opening 21 of the lattice part 22, the dust collected in the water permeable part 24 can be easily removed. There is no need for the trouble of removing the wire tray 10 and cleaning the wire mesh.

  The manufacturing method of the strainer 20 which comprises the above roof drains 1 is demonstrated with FIG. FIG. 3 is a manufacturing diagram of a part of the strainer 20. In addition, the strainer 20 in a state where the water permeable portion 24 is not formed has the same configuration as a conventional strainer. Therefore, the strainer 20 of the present invention can also be manufactured using an existing strainer used for the roof drain 1 already installed on the rooftop of a building or the like. For this reason, the strainer 20 of the present invention can be manufactured not only at a dedicated manufacturing factory but also at a site where the roof drain 1 is set. The manufacturing diagram shown in FIG. 3 can be applied to any of a dedicated manufacturing factory and an installation site.

  First, the strainer 20 in a state where the water permeable portion 24 is not formed is cleaned to remove the dirt on the surface (step 1 cleaning process). The cleaning of the surface is not particularly limited as long as it is a method capable of removing surface contamination, such as wiping the surface with a cloth or dipping in a liquid. However, as shown to FIG. 2 (A), the strainer 20 of this embodiment becomes the structure by which the water-permeable part 24 was formed from the inner side of the strainer 20. As shown in FIG. Therefore, in this case, the cleaning process needs to be performed carefully on the inner surface side of the strainer 20. Moreover, if it is the existing strainer 20 actually used, the cleaning which removes rust is also included in this cleaning process.

  Next, the outer surface side of the strainer 20 that has been cleaned is covered with tape, paper, or the like (step 2 masking step). This masking process is to prevent the aggregate 23 filled in the opening 21 in the subsequent process from popping out of the opening 21 and attaching the aggregate 23 to the outer surface side of the strainer 20. As shown in FIG. 1 (A), if the aggregate 23 is only filled in the opening 21, the lattice of the lattice portion 22 of the strainer 20 can be visually recognized as it is, so that the aesthetic appearance of the strainer 20 is impaired. Absent. Further, the screw hole of the lower edge 20c of the strainer 20 is not blocked. Note that the masking step does not have to be performed on the entire outer surface side of the strainer 20, and only the openings 21 of the lattice portion 22 may be covered from the outer surface side.

  Next, a primer is applied to the inner surface side of the strainer 20 that has been masked (step 3 primer application step). This primer is used to increase the adhesion to the aggregate 23 and the adhesive filled in the opening 21 and may be an existing one, but a fine fiber (registered below) that is an adhesive described later. (Trademark), a primer having the same molecular structure as that of the fine fiber is preferable.

  Next, the aggregate 23 made of natural stone and the adhesive are kneaded in a separately prepared container (step 4 kneading step). The aggregate 23 is a natural stone having a particle diameter of about 2 to 5 mm. As the size of the aggregate 23, natural stone having a larger particle size can be used, but if it is too large, it may not fit in the opening 21 or may block the opening 21. Therefore, it is necessary to select the particle size of the aggregate 23 in consideration of the opening width of the opening 21. The particle size of the aggregate 23 is preferably smaller than the opening width of the opening 21 of the strainer 20, and the aggregate 23 having a particle size of about 10 to 60% with respect to the opening width is suitable.

  Moreover, the water permeable part 24 formed in the opening 21 needs to have practically sufficient water permeability and durability. For this reason, in the present embodiment, an adhesive in which fibers are mixed from various adhesives is used as an adhesive for fixing the aggregates 23 to each other. The adhesive in which the fibers are mixed is obtained by mixing fibers such as glass fibers and carbon fibers in a synthetic resin such as acrylic, urethane, or epoxy. In this embodiment, the aggregate 23 is made of such an adhesive by using a fine synthetic resin “Fine Fiber” (registered trademark) of Fine Chemical Co., Ltd., which is particularly known as a water-permeable pavement material. Is fixed.

  The fine fiber is composed of a main agent and a hardening agent. The kneading with the aggregate 23 is performed by first mixing the main agent and the hardening agent first, and then kneading with the aggregate 23. If the amount of the fine fiber is too small, the strength of the water-permeable portion 24 after curing is insufficient, and if it is too large, the water-permeable property of the water-permeable portion 24 is deteriorated. It is used to be 9%. In addition, if it is the structure which forms the water permeable part 24 inside the strainer 20 like this embodiment, compared with the structure which forms the water permeable part 24 in the outer side of the strainer 20, the intensity | strength of the water permeable part 24 may be low. Since there is no, water permeability can be improved.

  Next, the strainer 20 to which the primer is applied is fitted into the mold 40 as shown in FIG. 3A (step 5 fitting step). At this time, the upper and lower sides are opposite to the strainer 20 of FIG. In this fitting process, the strainer 20 is fitted in the mold 40 so that the tape on the outer surface side in the masking process is not peeled off when the kneaded adhesive and the aggregate 23 are pressed from the inside of the strainer 20. It is for doing so. Then, for example, using a powder such as sand, the strainer 20 can be directly pressed into the powder and used as the mold 40. Moreover, what formed the formwork which modeled the shape of the strainer 20 using casting sand etc. can also be used. In the case of using a mold, the masking process in step 3 may be omitted as long as the mold and the adhesive can be easily peeled off.

  Next, the kneaded material obtained by kneading the aggregate 23 and the adhesive is filled into the opening 21 from the inside of the strainer 20 fitted in the mold 40 (step 6 filling step). Here, the kneaded material may be filled only in the opening 21. However, when only the opening 21 is filled, the water permeable portion 24 after curing may be removed from the opening 21 when, for example, the strainer 20 is dropped. Therefore, as shown in FIG. 2B, it is preferable that the water permeable portion 24 is formed not only on the opening 21 but also on the entire inner surface of the strainer 20.

  A filling process in the case where the water permeable portion 24 is formed on the entire inner surface of the strainer 20 as in the present embodiment will be described. First, as shown in FIG. 3B, the kneaded material is filled inside the upper surface 20a of the strainer 20 fitted into the mold 40. The kneaded material filled inside the upper surface 20a is struck and pressurized. Thereafter, it may be left for a predetermined time (about 3 hours) until the kneaded product is cured.

  Next, as shown in FIG. 3C, a columnar tool 41 such as a void tube is set up on the kneaded material inside the upper surface 20a, and the kneaded material is placed between the columnar tool 41 and the side surface 20b of the strainer 20. Fill.

  Then, after filling the kneaded material between the columnar tool 41 and the side surface 20b, as shown in FIG. 3D, the columnar tool 41 is removed, the surface of the kneaded material is beaten, and pressurized for a predetermined time (3 hours). About) Let stand and wait for the kneaded material to cure. As the kneaded material is cured, a water permeable portion 24 is formed on the entire inner surface of the strainer 20.

  As described above, the strainer 20 according to this embodiment is configured to apply the primer to the cleaning process in Step 1 for cleaning the surface of the strainer 20, the masking process in Step 2 for covering the outer surface side of the strainer 20, and the inner surface of the strainer 20. The step 3 primer application step, the step 4 kneading the aggregate 23 and the adhesive, the step 5 fitting step of fitting the strainer 20 into the mold 40, the kneading step of the aggregate 23 and the adhesive. It can be manufactured through a filling process in Step 6 in which an object is filled on the inner surface of the strainer 20.

  Since the strainer 20 manufactured through this manufacturing process includes the water permeable portion 24 in the lattice portion 22, the strainer 20 is used as the strainer 20 constituting the roof drain 1. It will be possible to prevent the inflow of fine dust into the pipe. Moreover, since the water permeable part 24 is formed in the opening 21 of the lattice part 22, since the dust collected in the water permeable part 24 can be removed easily, cleaning can be performed easily. Moreover, the strainer 20 of this embodiment can be manufactured using the strainer currently used for the roof drain 1 already used on the rooftop etc. of a building, and the manufacturing method of the strainer 20 of this embodiment is actual. Even at the site of use, the manufacturing work can be performed easily and without difficulty.

  Further, in the strainer 20 of the present embodiment, as shown in FIG. 2A, the water permeable portion 24 formed in the opening 21 is formed on the entire inner surface of the strainer 20. Therefore, peeling between the water permeable portion 24 and the strainer 20 hardly occurs. Moreover, since the water-permeable part 24 exists inside the strainer 20, since the grating | lattice of the grating | lattice part 22 of the strainer 20 can be visually recognized as it is conventionally shown in FIG. 1 (A), the beauty | look of the strainer 20 is not impaired. . Further, when the water permeable portion 24 is formed outside the strainer 20, not only the beauty is impaired because the lattice of the strainer 20 cannot be visually recognized, but also the strength becomes more important because the water permeable portion 24 is exposed. However, if the water-permeable portion is made too thick in order to ensure strength, the water permeability of the water-permeable portion 24 is impaired. Further, when the water permeable portion 24 is formed outside the strainer 20, care must be taken so that the screw hole of the lower edge 20 c of the strainer 20 is not blocked by the water permeable portion 24.

  In addition, in the manufacturing process of said strainer 20, the primer application process of step 3 can also be performed after the fitting process of step 5. Further, the masking process in step 2 and the fitting process in step 5 are not necessarily required, and only one of the processes may be performed. Moreover, what is necessary is just to perform the kneading | mixing process of step 4 at an appropriate timing, for example, after step 1.

  As described above, the roof drain 1 of the present embodiment is the roof drain 1 including the tray portion 10 and the strainer 20, and a plurality of aggregates 23 are fixed to the openings 21 of the lattice portion 22 of the strainer 20 with an adhesive. A water permeable portion 24 is formed, and a water permeable plate 25 is arranged on the dish-like upper portion 12 of the tray portion 10 as shown in FIG.

  As shown in FIG. 2 (B), the water permeable plate 25 is a circular plate in which a plurality of aggregates 26 are fixed with an adhesive, similarly to the water permeable portion 24, and is disposed in the circular hole 12a of the dish-like upper portion 12. The Small trash is blocked by the water permeable portion 24 formed on the strainer 20, but since there is a slight gap between the strainer 20 fixed to the tray portion 10 and the tray portion 10, It is also conceivable that small garbage flows into the tub. Therefore, the water permeable plate 25 is installed in order to dam the small garbage which flows in between the saucer part 10 and the strainer 20 and flows through the vertical pipe.

  Further, since the water permeable plate 25 is made by fixing the aggregate 26 with an adhesive like the water permeable portion 24, the water permeable plate 25 can be manufactured simultaneously with the water permeable portion 24. Compared to such a wire mesh, it is possible to easily clean the fibrous garbage.

  As described above, the roof drain 1 of the present embodiment includes not only the water permeable portion 24 in which the plurality of aggregates 23 are fixed to the openings 21 of the lattice portion 22 of the strainer 20 with the adhesive, but also the plurality of bones in the tray portion 10. The water-permeable board 25 which fixed the material 26 with the adhesive agent is provided. Therefore, it is possible to more reliably prevent small dust from flowing into the tub tube.

  Moreover, in order to clean the water permeable plate 25, it is necessary to remove the strainer 20 from the tray portion 10, but since the water permeable portion 24 is formed in the strainer 20, the amount of dust collected on the water permeable plate 25 is very small. For this reason, the roof drain 1 can reduce the troublesome cleaning of the water permeable plate 25. Therefore, when the strainer 20 of this embodiment is applied to Patent Document 1 and Patent Document 2 in which a wire mesh is installed between the tray portion 10 and the strainer 20, the number of cleaning of the wire mesh can be reduced.

  In the manufacture of the water permeable plate 25, as in the water permeable portion 24, an adhesive mixed with fibers is used as an adhesive for bonding the aggregate 26, and the water permeable plate 25 uses fine fiber (registered trademark). ing. Moreover, the aggregate 23 which comprises the water permeable part 24, and the aggregate 26 which comprises the water permeable board 25 can use the same natural stone and the thing of the same particle diameter, However, in the water permeable board 25, importance is attached to water permeability more. And you may use the aggregate 26 of a larger particle size than the aggregate 23 of the water permeable part 24. FIG. By using the aggregate 26 having a large particle size, the gap between the adjacent aggregates 26 is widened, and the water permeability of the water permeable plate 25 is increased.

  FIG. 4 is an actual product photograph of the roof drain 1 of the present embodiment. 4A is an exploded photograph of the roof drain 1, FIG. 4B is an assembled photograph of the roof drain 1, and FIG. 4C is a photograph showing the water permeability of the roof drain 1. FIG.

  In the first place, the roof drain 1 is used as a drainage means on the roof of a building or on a veranda. Therefore, the flow of water must not be hindered by the roof drain 1 of this embodiment. Then, as shown in FIG.4 (C), it tried to apply tap water from the upper part of the roof drain 1 in the shape of a shower in the fully open state. However, water did not drip from the outer peripheral edge of the bowl 12b of the dish-shaped upper part 12, and water was discharged from the inside of the cylindrical lower part 11 of the tray part 12 all. From this, the roof drain 1 of the present embodiment has sufficient water permeability, and it can sufficiently cope with rain of about 50 mm per hour, and has recently become a problem with heavy rain exceeding 100 mm per hour. Even so, it seems to be able to respond sufficiently.

[Embodiment 2]
The roof drain 1 of the first embodiment is a so-called circular roof drain, but various types of roof drains are known. The present invention can be applied to various roof drains, and a so-called L-shaped roof drain 1 ′ will be described in the second embodiment. FIG. 5A is a side view of the roof drain 1 ′, and FIG. 5B is a front view of the strainer 200 constituting the roof drain 1 ′.

  The roof drain 1 ′ is composed of a tray part 100 connected to the soot tube and a strainer 200 in which a lattice part 220 is formed and fixed to the tray part 100, and the roof drain 1 ′ itself is an L-type that has been conventionally known. Since it is the same as a roof drain, detailed description is abbreviate | omitted.

  The roof drain 1 ′ of the present embodiment has a configuration in which a water permeable portion 240 in which a plurality of aggregates 230 are fixed with an adhesive is formed in the opening 210 of the lattice portion 220.

  Accordingly, the roof drain 1 ′ can prevent inflow of fine dust, which has conventionally passed through the opening 210, by the water permeable portion 240. Moreover, since the water permeable part 240 is formed in the opening 210 of the lattice part 220, the dust accumulated in the water permeable part 240 can be easily removed.

  The roof drain 1 ′ of the second embodiment has a water permeable portion 240 formed from the inside of the strainer 200 as in the roof drain 1 of the first embodiment, but when the inside of the strainer 200 is narrow, the strainer 200. You may form the water-permeable part 240 from the outer side. In this case, care must be taken so that the screw holes used when the strainer 200 is fixed to the receiving plate 100 are not blocked.

  The roof drain of the present invention can be applied to a relay roof drain used for relay in addition to the circular roof drain 1 of the first embodiment and the L-shaped roof drain 1 ′ of the second embodiment. If it is a relay roof drain, it is necessary to form a water permeable portion on the side surface where a plurality of openings are formed, but if it is a relay roof drain that has already been used, the water permeable portion is formed on the outer surface side of the side surface. Is preferred. This is because an operation such as removal of the soot tube is not necessary as compared with the case where the water permeable portion is formed on the inner surface side of the side surface.

  Moreover, although the aggregate which comprises a water permeable part uses the aggregate which consists of a natural stone, you may use a plastic piece, a molten scrub, a rice husk, a thinning material chip | tip, etc. besides a natural stone. Further, in FIGS. 1 and 2, etc., the aggregate is shown as being transparent and painted black, but this is merely for easy understanding. However, aggregates that are actually colored or different types of aggregates may be used. Moreover, although the aggregate is shown by a simple circle, the actual aggregate has an uneven surface. And as the surface roughness of the aggregate increases, the contact area with the adjacent aggregate increases.

DESCRIPTION OF SYMBOLS 1, 1 ': Roof drain 10,100: Dish part 11: Cylindrical lower part 12: Dish upper part 12a: Circular hole 12b: Coral 12c: Protrusion 20, 200: Strainer 20a: Upper surface 20b: Side surface 20c: Lower edge 21: Opening 22: Lattice portion 23, 26: Aggregate 24: Water permeable portion 25: Water permeable plate 30: Screw 40: Mold

Claims (5)

A roof drain comprising a saucer part connected to the soot tube, and a strainer in which a lattice part is formed and fixed to the saucer part,
A roof drain having a water permeable portion in which a plurality of aggregates are fixed with an adhesive at the opening of the lattice portion of the strainer.   The roof drain according to claim 1, wherein the water permeable portion is formed from the inside of the strainer.   The roof drain according to claim 1 or 2, wherein the adhesive is Fine Fiber (registered trademark) of Fine Chemicals Co., Ltd. A strainer for roof drain that is formed on a lattice part and fixed to a tray part that constitutes the roof drain,
A roof drain strainer characterized in that a water permeable portion in which a plurality of aggregates are fixed with an adhesive is formed in the opening of the lattice portion. A method of manufacturing a strainer for roof drain that is formed on a grid part and fixed to a tray part that constitutes the roof drain,
A cleaning step of cleaning the surface of the lattice part;
A primer application step of applying a primer to the cleaned lattice portion surface;
A kneading step of mixing the aggregate and the adhesive;
A filling step of filling the kneaded product in the kneading step into the openings of the lattice part;
The manufacturing method of the strainer for roof drains characterized by having.