Drainage outlet protective devices, drainage outlet protective structures, building and roof drain construction methods

Abstract

To provide protector equipment for protecting a drain port when constructing a rooftop, a balcony or the like.SOLUTION: A drain port protector 200 for covering a drain port formed on an upper surface of a slab comprises a top wall part 210, two or more leg parts extending downward from a lower surface of the top wall part 210, and a first surrounding wall part 220 positioned outside the two or more leg parts and extending downward from the lower surface of the top wall part 210. The first surrounding wall part 220 is formed by separating the lower end of the first surrounding wall part 220 from an upper surface of the slab in a state of surrounding an axial line O1 of the top wall part 210 and covering the drain port.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a drain outlet protector and a method for installing a roof drain. [Background technology]

[0002] Drainage outlets are formed on the roofs and balcony slabs of buildings. These drainage outlets are connected to drain pipes extending downward, and rainwater and other water is drained from the drainage outlets into the drain pipes. A roof drain may be installed at the drain outlet, which improves drainage efficiency. For example, Patent Document 1 proposes a roof drain that includes a drainage member and a connecting short pipe, the drainage member being screwed onto the upper end of the connecting short pipe, and the lower end of the connecting short pipe being formed with a resin piping connection part that is connected to a drain pipe. According to the invention of Patent Document 1, the efficiency of the connection between the drainage member and the drain pipe is improved. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2020-153224 Summary of the Invention [Problem to be solved by the invention]

[0004] During the construction process from when a drain outlet is formed on a rooftop to when a roof drain is installed, the drain outlet is exposed. During this construction, if hard foreign objects (parts such as bolts and nuts, or tools such as wrenches) accidentally enter the drain outlet and fall into the drain pipe, there is a risk of damaging the drain pipe. For this reason, it is necessary to protect the drain outlet during construction on a rooftop. SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a drain outlet protector that protects a drain outlet. [Means for solving the problem]

[0005] The present invention has the following aspects. <1> A drainage outlet protector that covers a drainage outlet formed on the upper surface of a slab, a top wall portion; two or more leg portions extending downward from a lower surface of the top wall portion; and a first surrounding wall portion located outward from the two or more legs and extending downward from the lower surface of the top wall portion, the first surrounding wall portion is circumferentially disposed around the axis of the top wall portion, A drain outlet protector, in which, when the drain outlet is covered, the lower end of the first surrounding wall portion is spaced apart from the upper surface of the slab. <2> a second surrounding wall portion between the leg portion and the first surrounding wall portion; The second surrounding wall portion is circumferentially arranged around the axis of the top wall portion. <1> A drain outlet protector as described in . <3> The top wall portion has a planned cutting line between the first surrounding wall portion and the second surrounding wall portion. <2> A drain outlet protector as described in . <4> the leg portion contacts the inner surface of the second surrounding wall portion; <2> or <3> A drain outlet protector as described in . <5> The top wall portion narrows from its periphery toward its center. <1> ~ <4> The drain outlet protector according to any one of the preceding items. <6> A resin molded body, <1> ~ <5> The drain outlet protector according to any one of the preceding items. <7> It is colored, <1> ~ <6> The drain outlet protector according to any one of the preceding items.

[0006] <8> <1> A method for installing a roof drain using the drain outlet protector described in a step of covering the drain outlet with the drain outlet protector in a state where the leg portion is downward and the lower end of the first surrounding wall portion is spaced apart from the upper surface of the slab; A step of adhering a waterproof sheet to an upper surface of the slab while the drain outlet is covered with the drain outlet protector; a step of attaching the waterproof sheet to the upper surface of the slab, removing the drain outlet protector, and providing a roof drain to the drain outlet; A method for constructing a roof drain. <9> <2> ~ <4> A method for installing a roof drain using the drain outlet protector according to any one of the above, a step of covering the drain outlet with the drain outlet protector in a state where the leg portion is downward and the lower ends of the first and second surrounding wall portions are spaced apart from the upper surface of the slab; a step of cutting the top wall portion between the first surrounding wall portion and the second surrounding wall portion, removing a portion outside the second surrounding wall portion, and forming a remaining portion into a small-diameter protector; A process of covering the drainage outlet with the small diameter protector and adhering a waterproof sheet to the upper surface of the slab while the lower end of the second surrounding wall portion is in contact with the upper surface of the slab; a step of attaching the waterproof sheet to the upper surface of the slab, removing the small diameter protective equipment, and providing a roof drain at the drainage outlet; A method for constructing a roof drain. [Effects of the Invention]

[0007] The drain outlet protector of the present invention can protect the drain outlet during construction. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 2 is a cross-sectional view of a roof drain according to one embodiment of the present invention. [Figure 2] 2(a) is a plan perspective view of a drain outlet protector according to one embodiment of the present invention, (b) is a bottom perspective view of a drain outlet protector according to one embodiment of the present invention, and (c) is a cross-sectional view taken along C1-C1 in FIG. 2(a). [Figure 3] 1 is a process diagram illustrating a method of using a drain outlet protector according to one embodiment of the present invention. [Figure 4] 1 is a process diagram illustrating a method of using a drain outlet protector according to one embodiment of the present invention. [Figure 5]5(a) is a plan perspective view of a drain outlet protector according to another embodiment, (b) is a bottom perspective view of a drain outlet protector according to another embodiment, and (c) is a cross-sectional view taken along C2-C2 in FIG. 5(a). DETAILED DESCRIPTION OF THE INVENTION

[0009] (roof drain) An embodiment of a roof drain will be described with reference to the drawings. FIG. 1 is a cross-sectional view of a roof drain 100 installed in a hole Sa in a slab (roof slab) S on a roof or balcony. The roof drain 100 of this embodiment is a so-called siphon-type roof drain.

[0010] A drain pipe E that extends downward through the interior of the building is connected to the lower end of the roof drain 100. The roof drain 100 is fixed to the slab S with anchors 14.

[0011] The roof drain 100 includes a base plate 10 , a clamp ring 20 , and a baffle 30 .

[0012] The base plate 10 has a function of positioning the drain pipe E and the roof drain 100 relative to the extraction hole Sa of the slab S, and a function of connecting the drain pipe E and the roof drain 100. The base plate 10 has a drop opening 11 including a connecting pipe 11c that can be connected to the drain pipe E, a sloped portion 12 that expands conically from the periphery of the drop opening 11, and four baffle support columns 13. The base plate 10 has anchors 14 that protrude downward from its bottom surface.

[0013] The drop port portion 11 has a connecting pipe 11c that can be connected to the drain pipe E, and a transition portion 11t between the connecting pipe 11c and the inclined portion 12. The connecting pipe 11c is an annular body having an opening D. The connecting pipe 11c has a female thread that can be screwed onto a male thread provided on the drain pipe E. The lower end or inner edge of the transition portion 11t is joined to the upper end of the connecting pipe 11c, and the upper end or outer edge is connected to the lower end or inner edge of the inclined portion 12. The transition portion 11t and the inclined portion 12 are integrally formed.

[0014] The transition section 11t extending from the connecting pipe 11c to the inclined section 12 has a tapered shape. That is, the inner diameter of the transition section 11t increases from bottom to top. This effectively accelerates the water in the drop port section 11, allowing it to flow quickly from the drop port section 11 to the drain pipe E. The transition section 11t may include an inner section that curves in an arc-like shape convexly inward, and a flat outer section that is integrally connected to the outer periphery of the inner section and extends along the horizontal plane.

[0015] The inclined portion 12 is annular. The lower end or inner edge of the inclined portion 12 is integrally connected to the drop-off portion 11. The upper end or outer edge of the inclined portion 12 is circular and is disposed along a plane HL perpendicular to the pipe axis Y of the connecting pipe 11c and along the upper surface or horizontal plane of the slab S. The inclined portion 12 has an inner diameter that widens from the bottom to the top.

[0016] The upper surface of the inclined portion 12 is inclined at an inclination angle θ in the range of 10° to 60° with respect to a plane HL perpendicular to the pipe axis Y of the connecting pipe 11c. As a result, even if the flow rate (volume) of water collecting above the inclined portion 12 is low, it can be accelerated by gravity to reach the outlet portion 11 and flow into the drain pipe E at a high flow rate. This improves drainage performance even with a low water volume. Note that the plane HL perpendicular to the pipe axis Y of the connecting pipe 11c may be a horizontal plane.

[0017] The baffle support columns 13 are rod-shaped bodies that protrude upward from the upper surface of the drop opening portion 11. In this embodiment, the baffle support columns 13 are arranged at equal intervals around the opening D. The number of baffle support columns 13 is not particularly limited, but may be, for example, 2 to 12. The lower ends of the baffle support columns 13 are joined to the upper surface of the drop opening portion 11. The baffle support columns 13 pass through the through holes 21g of the clamp ring 20 and are connected to the baffle 30 by appropriate fastening devices (not shown), such as washers and nuts.

[0018] The clamp ring 20 is provided above the base plate 10 . The clamp ring 20 has the function of clamping and fixing the waterproof sheet F between itself and the base plate 10. The clamp ring 20 has an annular, plate-shaped clamp base 21 and a lip 22 extending upward from the entire circumference of the outer circumferential edge 21e of the clamp base 21. Since the clamp ring 20 has the lip 22 extending upward from the entire circumference of the outer circumferential edge 21e of the clamp base 21, the rigidity of the clamp ring 20 is increased.

[0019] The clamp base 21 has an opening 21a in the center. Water flowing over the slab S passes through this opening 21a and flows into the drain pipe E. The clamp base 21 has two or more through holes 21g for passing the baffle support columns 13 through. This ensures that the clamp ring 20 is positioned relative to the base plate 10.

[0020] The baffle 30 has a lid portion 31 arranged above the drop opening portion 11 and a vertical rib 32 provided around the periphery of the lid portion 31.

[0021] The lid portion 31 has the function of making it difficult for air to be taken in from above the drop opening portion 11, thereby enhancing the siphon effect of the drain pipe E. The lid portion 31 covers the upper part of the opening D of the connecting pipe 11c. The lid portion 31 is disk-shaped and centered on the pipe axis Y. The lid portion 31 is provided spaced above the drop opening portion 11. In plan view, the lid portion 31 is large enough to cover the entire transition portion 11t. In other words, the diameter of the outer peripheral edge of the lid portion 31 is larger than the diameter of the outer peripheral edge of the transition portion 11t of the drop opening portion 11.

[0022] The vertical ribs 32 are members that have the function of rectifying the water that collects around the base plate 10, making it less likely that vortexes that take in air will be generated, and enhancing the siphon effect of the drain pipe E. The vertical ribs 32 are plate-like bodies that extend radially outward from the pipe axis Y along a plane that passes through the pipe axis Y. Multiple vertical ribs 32 are provided radially from the pipe axis Y at equal intervals.

[0023] The lower ends of the vertical ribs 32 are shaped to fit along the upper surface of the clamp ring 20. As a result, even if the flow rate of water flowing along the upper surface of the clamp ring 20 below the upper surface of the slab S is low, the lower ends of the vertical ribs 32 act on the flowing water, reliably rectifying it to suppress the generation of vortices. The lower ends of the vertical ribs 32 may also be shaped to fit along the upper surface of the base plate 10.

[0024] (Protective equipment for drains) The drain outlet protector of the present invention has a top wall portion, leg portions extending downward from the underside of the top wall portion, and a first surrounding wall portion located outward from the leg portions and extending downward from the underside of the top wall portion. The drain outlet protector will be described below with reference to the drawings.

[0025] 2 has a top wall portion 210 that is circular in plan view, a cylindrical first fitting tubular portion 230, and a first surrounding wall portion 220. In this embodiment, the first fitting tubular portion 230 is a leg portion.

[0026] The top wall portion 210 has a flat plate portion 214 that is perfectly circular and smooth in plan view, and an expanded diameter portion 216 that extends downward from the periphery of the flat plate portion 214. The diameter of the expanded diameter portion 216 increases as it extends downward. In other words, the top wall portion 210 narrows from the periphery toward the center. Because the top wall portion 210 narrows toward the center, rainwater and the like on the top wall portion 210 runs down the upper surface of the top wall portion 210 and falls more quickly.

[0027] Four first fitting cylindrical portions 230 are provided on the underside of the top wall portion 210. The four first fitting cylindrical portions 230 are arranged at approximately equal intervals around the axis O1 of the drain port protector 200. The number of first fitting cylindrical portions 230 is not particularly limited as long as it is two or more, but is preferably 12 or less, for example. Furthermore, the two or more first fitting cylindrical portions 230 do not have to be arranged at equal intervals around the axis O1. In this embodiment, the inner diameter of the first fitting cylindrical portion 230 is smaller than the outer diameter of the baffle support column 13. The inner diameter of the first fitting cylindrical portion 230 may be the same as or larger than the outer diameter of the baffle support column 13. However, in order to allow the drain outlet protector 200 to be freely positioned relative to the drain outlet 19 in the up-down direction, it is preferable that the inner diameter of the first fitting cylindrical portion 230 be smaller than the outer diameter of the baffle support column 13.

[0028] As shown in Figure 2(c), the first fitting cylindrical portion 230 has a slit 232 formed in it that extends upward (towards the ceiling wall portion 210) from the lower end 234. In the roof drain installation method described below, the inner diameter of the first fitting cylindrical portion 230 is smaller than the outer diameter of the baffle support post 13, and the slit 232 is formed. Therefore, when the baffle support post 13 is inserted into the first fitting cylindrical portion 230, the slit 232 widens and the first fitting cylindrical portion 230 receives the baffle support post 13. At this time, by changing the degree to which the baffle support post 13 is inserted into the first fitting cylindrical portion 230, the vertical positional relationship of the drain outlet protector 200 with respect to the drain outlet 19 can be freely adjusted. There may be one or two or more notches 232 per first fitting cylindrical portion 230. When the first fitting cylindrical portion 230 has two or more notches 232, the upper limit of the number of notches 232 is preferably four or less.

[0029] The first surrounding wall portion 220 extends downward from the periphery of the top wall portion 210. The first surrounding wall portion 220 goes around the periphery of the top wall portion 210. As a result, the first surrounding wall portion 220 is located outward of the four first fitting cylindrical portions 230 and surrounds the four first fitting cylindrical portions 230.

[0030] In this embodiment, a second surrounding wall portion 240 is provided on the lower surface of the top wall portion 210 between the four first fitting cylindrical portions 230 and the first surrounding wall portion 220. The second surrounding wall portion 240 is circumferentially arranged around the axis O1. The second surrounding wall portion 240 is in contact with the four first fitting cylindrical portions 230. That is, the four first fitting cylindrical portions 230 are in contact with the inner surface of the second surrounding wall portion 240. In this embodiment, the lower end 244 of the second surrounding wall portion 240 is located lower than the lower end 234 of the first fitting cylindrical portion 230 . In this embodiment, the lower end 244 of the second surrounding wall portion 240 is preferably positioned at the same level as or lower than the lower end 224 of the first surrounding wall portion 220 (i.e., the lower end 244 is positioned at the same level as the lower end 224 or in a direction away from the top wall portion 210), and more preferably the lower end 244 is positioned lower than the lower end 224. Positioning the lower end 244 lower than the lower end 224 allows it to follow the shape of the inclined portion 12.

[0031] A cutting line 212 is formed on the top wall 210 between the first surrounding wall 220 and the second surrounding wall 240. The cutting line 212 goes around the axis O1. In this embodiment, the cutting line 212 is a recessed line formed on the upper surface of the top wall 210. The cutting line 212 may be a protruding line, a recessed line formed on the lower surface of the top wall 210, or a printed marking.

[0032] Eight cylindrical second fitting cylinders 250 are provided on the top wall 210 between the first surrounding wall 220 and the second surrounding wall 240. The eight second fitting cylinders 250 are arranged at equal intervals around the axis O1. The number of second fitting cylinders 250 is not particularly limited as long as it is two or more, but is preferably 12 or less, for example. The second fitting cylinders 250 do not have to be arranged at equal intervals around the axis O1. Incidentally, by providing the second fitting cylindrical portion 250, it is possible to accommodate the case where the baffle support column 13 is provided on a circumference with a larger diameter.

[0033] As shown in FIG. 2(c), the second fitting cylindrical portion 250 has a notch 252 formed in the lower end 254 facing upward.

[0034] In this embodiment, the first fitting cylindrical portion 230, the second surrounding wall portion 240, the planned cutting line 212, the second fitting cylindrical portion 250, and the first surrounding wall portion 220 are located in this order on concentric circles centered on the axis O1.

[0035] The thicknesses of the top wall portion 210, the first surrounding wall portion 220, and the second surrounding wall portion 240 may be the same as or different from one another.

[0036] The material of the drain outlet protector 200 is not particularly limited, but is preferably a resin. That is, the drain outlet protector 200 is preferably a resin molded body. The resin of the drain outlet protector 200 is more preferably polyolefin, and even more preferably polypropylene. The resin used for the drain outlet protector 200 may be derived from recycled materials. The drain outlet protector 200 is removed and discarded after the roof drain is installed, so it does not require high mechanical strength. The drain outlet protector 200 is used for a short period of time. For this reason, the drain outlet protector 200 does not need to be weather resistant. In other words, the drain outlet protector 200 does not need to contain ultraviolet absorbers, antioxidants, and the like.

[0037] It is preferable that at least the upper surface of the top wall portion 210 of the drain outlet protector 200 is colored. The drain outlet protector 200 is also used while pouring concrete and hardening it to form the slab S. For this reason, it is preferable that the drain outlet protector 200 is colored so that it can be distinguished from the slab S. The color tone of the drain outlet protector 200 is not particularly limited as long as it can be distinguished from concrete, and examples include green, red, yellow, blue, etc. The drain outlet protector 200 may be painted only on the upper surface of the top wall portion 210, or the entire drain outlet protector 200 may be colored.

[0038] (Roof drain installation method) A method for constructing a roof drain using the drain outlet protector of this embodiment will be described below. The method for constructing a roof drain in this embodiment includes the steps of (1) covering the drain outlet with a drain outlet protector, (2) changing the drain outlet protector to a small diameter protector, (3) covering the drain outlet with the small diameter protector and adhering a waterproof sheet to the top surface of the slab, and (4) removing the small diameter protector and installing a roof drain at the drain outlet.

[0039] <Process (1)> Step (1) is a step of covering the drain with a drain protector. As shown in FIG. 3(a), the drop port portion 11 is inserted into the drilled hole Sa, and the connecting pipe 11c and the drain pipe E are connected. The slab S is cast so that the anchor 14 is positioned within the slab S. In this way, the base plate 10 is fixed to the slab S. At this point, the drain port 19 formed by the opening of the base plate 10 opens upward. The base plate 10 also becomes part of the slab S.

[0040] The baffle support column 13 is received in the first fitting cylindrical portion 230 of the drain outlet protector 200, and the first fitting cylindrical portion 230 and the baffle support column 13 are fitted together. In this way, the drain outlet 19 is blocked by the drain outlet protector 200. At this time, the lower end 224 of the first surrounding wall portion 220 and the lower end 234 of the second surrounding wall portion 240 are spaced apart from the upper surface of the base plate 10 (FIG. 3(b)). In other words, the lower end 224 of the first surrounding wall portion 220 and the lower end 234 of the second surrounding wall portion 240 are spaced apart from the upper surface of the slab S.

[0041] The distance d1 between the lower end 224 and the upper surface of the base plate 10 is preferably, for example, 1 to 20 mm, and more preferably 5 to 15 mm. If the distance d1 is equal to or greater than the above-mentioned lower limit, rainwater and the like can flow more smoothly into the drain outlet 19 while the drain outlet protector 200 is covering the drain outlet 19. If the distance d1 is equal to or less than the above-mentioned upper and lower limits, parts, tools, and the like can be more effectively prevented from falling from the drain outlet 19 into the drain pipe E.

[0042] The distance d2 between the lower end 234 and the upper surface of the base plate 10 is preferably, for example, 1 to 20 mm, and more preferably 5 to 15 mm. If the distance d2 is equal to or greater than the above-mentioned lower limit, rainwater and the like can flow more smoothly into the drain outlet 19 when the drain outlet protector 200 covers the drain outlet 19. If the distance d2 is equal to or less than the above-mentioned upper and lower limits, parts, tools, and the like can be more effectively prevented from falling from the drain outlet 19 into the drain pipe E. The distance d1 and the distance d2 may be the same or different. Alternatively, only one of the distances d1 and d2 may be within the above range (1 to 20 mm), while the other exceeds the upper limit.

[0043] The distance d1 can be adjusted by the degree to which the baffle support column 13 is inserted into the first fitting cylindrical portion 230. If the inner diameter of the first fitting cylindrical portion 230 is smaller than the outer diameter of the baffle support column 13, the degree of insertion of the baffle support column 13 into the first fitting cylindrical portion 230 can be adjusted more easily.

[0044] (Process (2)) Step (2) is a step of converting the drain outlet protector into a small-diameter protector. This step is a preparation step, for example, from pouring concrete and hardening the slab S to installing a waterproof sheet on the slab S.

[0045] As shown in FIG. 4( a ), the baffle support column 13 and the first fitting cylindrical portion 230 are released from each other, and the drain outlet protector 200 is removed from the drain outlet 19 . The top wall portion 210 is cut along the planned cutting line 212, and separated into a small diameter protector 200a inside the planned cutting line 212 and a portion 200b outside the planned cutting line 212. In this way, the outer portion 200b is cut off, and the remaining portion becomes the small diameter protector 200a.

[0046] <Process (3)> Step (3) is a step of covering the drainage hole with a small diameter protector and placing a waterproof sheet on the slab. As shown in FIG. 4(b), a waterproof sheet F is adhered to the upper surface of the slab S (including the upper surface of the base plate 10) (waterproof sheet installation operation). The baffle support column 13 is received in the first fitting tubular portion 230 of the small-diameter protector 200a, and the small-diameter protector 200a blocks the drainage opening 19 (sealing operation). Note that this process is not intended for use during rainfall, as the waterproof sheet is adhered to the slab. Therefore, during the sealing operation, it is preferable that the lower end 244 of the second surrounding wall portion 240 be in contact with the upper surface of the slab S (the upper surface of the base plate 10). Having the lower end 244 in contact with the upper surface of the slab S more reliably prevents instruments, tools, etc. from falling from the drainage opening 19 into the drain pipe E. Alternatively, a waterproof sheet F may be sandwiched between the lower end 244 and the upper surface of the slab S. The order of the sealing operation and the waterproof sheet installation operation may be either the sealing operation first or the waterproof sheet installation operation first.

[0047] <Process (4)> Step (4) is a step of removing the small diameter protective equipment and installing a roof drain at the drain outlet. As shown in Figure 4(c), after the waterproof sheet F is adhered to the upper surface of the slab S, the first fitting cylindrical portion 230 is released from the baffle support column 13, and the small diameter protector 200a is removed, thereby exposing the drainage opening 19. Next, the parts of the roof drain are assembled in order according to the type of roof drain. For example, when installing the roof drain 100 in Fig. 1 at the drain outlet 19, the baffle support column 13 is passed through the through-hole 21g, and the clamp ring 20 is positioned on the base plate 10. At this time, the waterproof sheet F is sandwiched between the clamp ring 20 and the base plate 10 from above and below. Next, the baffle support column 13 is passed through the through-hole 31 g of the baffle 30 , and the baffle 30 is positioned on the clamp ring 20 . In this way, the base plate 10, the clamp ring 20, and the baffle 30 are stacked in this order from below, and fixed with bolts, nuts, etc. as necessary, to provide the roof drain 100 at the drain port 19.

[0048] According to the drain outlet protector of this embodiment, since it has a ceiling wall portion, legs, and a first surrounding wall portion, it can prevent parts and tools from falling from the drain outlet into the drain pipe without interfering with the drainage of rainwater, etc., when installed on a roof, balcony, etc.

[0049] According to the roof drain installation method of this embodiment, the drain outlet protector of this embodiment is used, so when installing on a roof, balcony, etc., parts and tools can be prevented from falling from the drain outlet into the drain pipe without interfering with the drainage of rainwater, etc.

[0050] (Other embodiments) The present invention is not limited to the above-described embodiments. The drain outlet protector according to the above-described embodiment has the second fitting tubular portion between the first surrounding wall portion and the second surrounding wall portion. However, the present invention is not limited to this, and the drain outlet protector does not have to have the second fitting tubular portion. 5 has four first fitting cylindrical portions 230, a second surrounding wall portion 240, and a first surrounding wall portion 220 arranged in this order on a concentric circle around the axis O2 on the underside of the top wall portion 210. The drain opening protector 300 differs from the drain opening protector 200 in that it does not have any second fitting cylindrical portions. According to this embodiment, since there is no second fitting cylindrical portion, the structure of the molding die is simplified, and productivity can be further improved.

[0051] Although the drain outlet protector in the above-described embodiment has a perfect circular shape in plan view, the present invention is not limited to this. The shape of the drain outlet protector in plan view can be determined appropriately depending on the shape of the base plate and the drain outlet in plan view. The shape of the drain outlet protector in plan view may be elliptical or polygonal, such as rectangular, hexagonal, or octagonal.

[0052] The base plate in the above-described embodiment has a tapered inclined portion that widens from the periphery of the drop opening. However, the present invention is not limited to this, and the base plate may have a member that is parallel to the upper surface of the slab S instead of the inclined portion. In this case, it is preferable that the lower ends of the first and second surrounding wall portions are at the same height.

[0053] Although the above-described embodiment includes a first fitting cylindrical portion, the present invention is not limited thereto. For example, instead of a baffle support column, a hole may be formed in the base plate, or a fitting cylindrical portion may be formed protruding upward from the base plate. In this case, instead of the first fitting cylindrical portion, a columnar body extending downward from the underside of the top wall portion may serve as a leg portion. In addition, instead of the second fitting cylindrical portion, a columnar body extending downward from the underside of the top wall portion may be provided.

[0054] Although the first surrounding wall portion in the above-described embodiment is continuous around the axis O1, the present invention is not limited to this, and the first surrounding wall portion may be a plurality of wall portions arranged at intervals.

[0055] The roof drain in the above-described embodiment is a so-called siphon type, but the present invention is not limited to this, and any type of roof drain may be used. [Explanation of symbols]

[0056] 19 Drain 100 Roof drain 200, 300 Protective equipment for drains 210 Ceiling wall 212 Cutting line 220 First Enclosing Wall 230 First fitting cylinder 240 Second Enclosure Wall 250 Second fitting cylinder S slab F. Waterproof sheet

Claims

1. A protective device for a drain, The top wall section is positioned above the drain, A first fitting cylinder portion extending downward from the lower surface of the top wall portion, It has a first surrounding wall portion located outside the first fitting cylindrical portion and extending downward from the lower surface of the top wall portion, A drain outlet protector in which the position of the drain outlet can be identified by the top wall portion.

2. The drain outlet protective device according to claim 1, wherein the top wall portion is colored.

3. The drain outlet protective device according to claim 1 or 2, wherein, when the drain outlet is covered, the lower end of the first surrounding wall portion is spaced apart from the surface on which the drain outlet is formed.

4. A base plate having a drain outlet portion that is connected to a drain pipe provided in the slab and includes a connecting pipe that can be connected to the drain pipe, A drain outlet protective device according to any one of claims 1 to 3, comprising: The base plate is provided with baffle support columns that protrude upward from the top surface and are arranged around the drain opening. A drain outlet protection structure in which the baffle support column is inserted into the first fitting cylinder portion.

5. The drain outlet protection structure according to claim 4, wherein the baffle support column is higher than the outer edge of the base plate.

6. A building having the drain outlet protection structure described in Claim 4 or 5.

7. A method for installing a roof drain using a drain outlet protective device according to any one of claims 1 to 3, The first fitting cylinder portion is positioned downwards, and the drain port is covered with the drain port protective device. The process of installing a waterproof sheet on the slab while the drain is covered with the aforementioned drain protection device, After installing the waterproof sheet on the slab, the protective device for the drain is removed, and a roof drain is installed at the drain. A method for installing roof drains, which includes [the specified feature].

8. The method for installing a roof drain according to claim 7, wherein the top wall portion of the drain outlet protective device is a different color from the waterproof sheet.

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