Roof drain, roof slab, building

Abstract

To provide a roof drain with high drainage performance at low water flow rates, a roof drain construction jig, and a roof drain construction method.SOLUTION: A roof drain 100 comprises: a base plate 10 having a drop port 11 including a connecting pipe that can be connected to a drain pipe E and a sloping portion 12 that expands conically from the periphery of the drop port 11; a clamp ring 20 installed above the base plate 10; and a lid 31 located above the drop port 11; and a baffle 30 having longitudinal ribs 32 provided around the lid section 31. The upper surface of the inclined portion 12 is inclined in a range from 10° to 60° with respect to a plane perpendicular to the pipe axis of the connecting pipe.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a roof drain construction tool and a method for constructing a roof drain.

Background Art

[0002] Conventionally, there has been a roof drain provided on the upper surface of a floor structure and having an opening that can be connected to a drain pipe extending downward.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, there has been room for improvement in the drainage performance of conventional roof drains at low water volumes.

[0005] In view of the above circumstances, the present invention has been made, and an object thereof is to provide a roof drain having high drainage performance at low water volumes.

Means for Solving the Problems

[0006] In order to solve the above problems, the present invention proposes the following aspects.

[0007] (1) A roof drain according to one aspect of the present invention includes a drain port portion including a connecting pipe that can be connected to a drain pipe, an inclined portion that extends conically from around the drain port portion, a base plate having the inclined portion, a clamp ring installed above the base plate, a lid portion disposed above the drain port portion, and a baffle having vertical ribs provided around the lid portion. The upper surface of the inclined portion is inclined in a range of 10° or more and 60° or less with respect to a plane orthogonal to the pipe axis of the connecting pipe.

[0008] This allows water to be accelerated by gravity to reach the outlet and flow into the drain pipe at a high velocity, even if the flow rate of water accumulating above the slope is low. Therefore, it is possible to improve drainage performance even with low water volumes.

[0009] (2) In (1) above, the lower end of the longitudinal rib may be shaped to conform to the upper surface of the clamp ring.

[0010] As a result, even if the water flowing along the top surface of the clamp ring below the top surface of the roof slab is at a low flow rate, the lower end of the vertical ribs acts on the flowing water, ensuring that the flow is straightened in a way that suppresses the generation of vortices.

[0011] (3) In (1) or (2) above, the transition section from the connecting pipe to the inclined section at the outlet section may be tapered.

[0012] This effectively accelerates the water flowing from the outlet to the drain pipe, allowing it to flow more quickly.

[0013] (4) A roof drain installation jig according to one aspect of the present invention comprises a guide pipe installed above a deck plate and supporting a base plate, a support base positioned at the lower end of the guide pipe, a bolt whose lower end is connected to the support base and which extends upward through the guide pipe, and an upper cover through which the bolt passes and which sandwiches the base plate between itself and the guide pipe, wherein the upper cover has a through-hole for a baffle support column through which a baffle support column provided in the base plate passes.

[0014] This ensures that the base plate is properly positioned relative to the support stand.

[0015] (5) A method for installing a roof drain according to one aspect of the present invention includes a support base installation step of installing a support base above a deck plate, a guide pipe installation step of installing a guide pipe above the deck plate while surrounding the support base, a base plate installation step of installing a base plate above the guide pipe, and an upper cover installation step of connecting a bolt passed through an upper cover that closes the upper end of the guide pipe to the support base by passing it through the base plate and the guide pipe, wherein in the upper cover installation step, a baffle support column provided in the base plate is passed through a through hole for a baffle support column provided in the upper cover.

[0016] This ensures that the base plate is reliably positioned relative to the support stand. [Effects of the Invention]

[0017] According to the roof drain, roof drain installation jig, and roof drain installation method of the present invention, drainage performance can be improved even with a low water volume. [Brief explanation of the drawing]

[0018] [Figure 1] This is a cross-sectional view of a roof slab including a roof drain according to an embodiment. [Figure 2] This is a cross-sectional view of the base plate according to the embodiment. [Figure 3] This is a detailed cross-sectional view showing the relationship between the longitudinal ribs, clamp rings, and base plate according to the embodiment. [Figure 4] This is a cross-sectional view of the base plate of a modified example 1 according to the embodiment. [Figure 5] This is a cross-sectional view of the base plate of a modified example 2 according to the embodiment. [Figure 6] This is a cross-sectional view of the base plate of modified example 3 according to the embodiment. [Figure 7] This is an assembly diagram showing how the roof drain installation jig according to the embodiment is applied to a base plate. [Figure 8]Exploded view when applying the roof drain construction tool according to the embodiment to the base plate. [Figure 9] Schematic diagram of an experiment comparing the drainage performance of the roof drain with respect to the inflow rate. [Figure 10] Diagram showing the relationship between the flow rate of water flowing in at the inflow point P and the water level at position a. [Figure 11] Diagram showing the relationship between the flow rate of water flowing in at the inflow point P and the water level at position b.

Mode for Carrying Out the Invention

[0019] Hereinafter, referring to FIGS. 1 to 3, an example of the roof drain 100 according to the embodiment of the present invention will be described below. FIG. 1 is a cross-sectional view of a roof slab S including the roof drain 100 according to the embodiment. FIG. 2 is a cross-sectional view of the base plate 10 according to the embodiment. FIG. 3 is a detailed cross-sectional view showing the relationship between the vertical rib, the clamp ring, and the base plate according to the embodiment. Note that FIGS. 1 to 8 are cross-sectional views passing through the pipe axis Y of the connecting pipe 11c.

[0020] (Roof Drain) The roof drain 100 according to the present embodiment can be applied, for example, to the drainage of the roofs of buildings such as buildings and condominiums. As shown in FIG. 1, the roof drain 100 is provided in the punching hole Sa of the roof slab S. A drain pipe E extending downward through the inside of the building is connected to the lower end of the roof drain 100. The roof drain 100 is provided integrally with the roof slab S by appropriately fixing the anchor 14 provided on the base plate to the roof slab S in a buried state.

[0021] The roof drain 100 includes a base plate 10, a clamp ring 20, and a baffle 30.

[0022] The base plate 10 is a component that has the function of positioning the drain pipe E and the roof drain 100 relative to the hole Sa in the roof slab S, and the function of connecting the drain pipe E and the roof drain 100. The base plate 10 has a drain outlet 11 including a connecting pipe 11c that can be connected to a drain pipe E, an inclined portion 12 that spreads out conically from around the drain outlet 11, and a baffle support column 13. The base plate 10 also has anchors 14 which are embedded in the roof slab S as appropriate. The anchors 14 are provided protruding downward from the bottom surface of the base plate 10.

[0023] The drain outlet section 11 includes a connecting pipe 11c that can be connected to the drain pipe E, and a transition section 11t between the connecting pipe 11c and the inclined section 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 the male thread provided on the drain pipe E. A transition section 11t is joined to the upper end of the connecting pipe 11c. The lower end or inner edge of the transition section 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 section. The transition section 11t and the inclined section 12 are formed integrally.

[0024] The transition section 11t from the connecting pipe 11c to the inclined section 12 is tapered. That is, the transition section 11t has an inner diameter that gradually widens from bottom to top. This effectively accelerates the water in the outlet section 11, allowing it to flow quickly from the outlet section 11 to the drain pipe E. The transition section 11t may include an inner section that curves inward in a convex arc shape, and a flat outer section that is integrally connected to the outer edge of the inner section and lies along a horizontal plane.

[0025] The inclined portion 12 is annular. The inclined portion 12 is shaped to follow the conical surface. The lower end or inner edge of the inclined portion 12 is integrally connected to the drainage outlet portion 11. The upper end or outer edge of the inclined portion 12 is circular and is positioned along the plane HL perpendicular to the pipe axis Y of the connecting pipe 11c, the upper surface of the roof slab S, or the horizontal plane. The inclined portion 12 has an inner diameter that gradually widens from bottom to top.

[0026] Here, as shown in Figures 1 and 2, the upper surface of the inclined section 12 is inclined at an angle θ in the range of 10° to 60° with respect to the plane HL perpendicular to the pipe axis Y of the connecting pipe 11c. As a result, even if the flow rate (volume) of water accumulating above the inclined section 12 is low, gravity accelerates it to reach the outlet section 11, and it can flow into the drain pipe E at a high velocity. Therefore, the drainage performance at low water volumes can be improved. Note that the plane HL perpendicular to the pipe axis Y of the connecting pipe 11c may be a horizontal plane. The inclination angle θ is more preferably 10° to 45°, and most preferably 12° to 30°.

[0027] The baffle support column 13 is a rod-shaped body that protrudes upward from the upper surface of the outlet portion 11. The lower end of the baffle support column 13 is supported by the upper surface of the outlet portion 11. The lower end of the baffle support column 13 is welded to the outlet portion 11, for example. The baffle support column 13 passes through the through hole 21g of the clamp ring 20 and through the through hole 31g of the baffle 30, and its upper part is locked to the upper surface of the baffle 30 via appropriate fasteners (not shown), such as washers and nuts. The upper end of the baffle support column 13 may be provided with an internal thread. The baffle support column 13 may be, for example, a bolt.

[0028] The clamp ring 20 is a component that has the function of sandwiching and fixing a waterproof sheet (not shown) between itself and the base plate 10. The clamp ring 20 is installed above the base plate 10. The clamp ring 20 has a lower surface that conforms to the shape of the upper surface of the base plate 10. This makes it easier to position the clamp ring 20 relative to the base plate 10. The clamp ring 20 has an annular, plate-shaped clamp base 21 and a lip 22 that extends upward from the entire circumference of the outer edge 21e of the clamp base 21. Because the clamp ring 20 has a lip 22 that extends upward from the entire circumference of the outer edge 21e of the clamp base 21, its rigidity can be increased.

[0029] The clamp base 21 has an opening 21a in the center. Water flowing over the roof slab S flows through this opening 21a to the drain pipe E. The clamp base 21 has two or more (four in this embodiment) through holes 21g for passing the baffle support column 13. This ensures that the clamp ring 20 is positioned correctly relative to the base plate 10.

[0030] The baffle 30 has a lid portion 31 positioned above the drain opening portion 11 and vertical ribs 32 provided around the lid portion 31.

[0031] The lid portion 31 is a component that has the function of making it difficult for air to be drawn in from above the drain outlet portion 11, thereby enhancing the siphon effect of the drain pipe E. The lid portion 31 covers the area above the opening D of the connecting pipe 11c. The lid portion 31 is disc-shaped with the pipe axis Y as its center. The lid portion 31 is provided spaced above the drain outlet portion 11. The lid portion 31 is large enough to completely cover the transition portion 11t of the drain outlet portion 11 from above. The diameter of the outer edge of the lid portion 31 is larger than the diameter of the outer edge of the transition portion 11t of the drain outlet portion 11.

[0032] The vertical ribs 32 are components that have the function of straightening the flow of water collected from around the base plate 10, making it difficult to create vortices that draw in air, and thereby enhancing the siphon effect of the drain pipe E. The vertical ribs 32 are plate-like bodies that extend radially from the pipe axis Y along a plane passing through the pipe axis Y. Multiple vertical ribs 32 are provided radially from the pipe axis Y at equal intervals.

[0033] Here, as shown in Figure 3, the lower end 32d of the longitudinal rib 32 is shaped to follow the upper surface 20u of the clamp ring 20 in a cross-sectional view through the pipe axis Y. As a result, even if the water flowing along the upper surface of the clamp ring 20 below the upper surface of the roof slab S is at a low flow rate, the lower end of the longitudinal rib 32 acts on the flowing water to reliably straighten the flow and suppress the generation of vortices. The lower end 32d of the longitudinal rib 32 may also be shaped to follow the upper surface 10u of the base plate 10.

[0034] (Variation 1) Next, we will describe a modified example 1 of the base plate 10. Figure 4 is a cross-sectional view of the base plate 10 of a modified example 1 according to the embodiment. As shown in Figure 4, the base plate 10 of the modified example 1 has a drain opening 11, an inclined portion 12, a baffle support column 13, and appropriate anchors (not shown), similar to the base plate 10 described above. Here, the transition section 11t at the outlet section 11 of the base plate 10 in Modification 1 includes an inner section 11ta whose lower end is connected to the connecting pipe 11c, and an outer section 11tb between the inner section 11ta and the inclined section 12. The inner section 11ta is curved inward in a convex arc shape when viewed in cross-section through the pipe axis Y. The outer section 11tb is tapered, with its inner diameter widening from bottom to top. This smooths the flow of water above the outlet section 11, and even if the flow rate of water accumulating above the inclined section 12 is low, gravity accelerates it to reach the outlet section 11, allowing it to flow into the drain pipe E at a high velocity.

[0035] (Modification 2) Next, we will describe a modified example 2 of the base plate 10. Figure 5 is a cross-sectional view of the base plate 10 of modified example 2 according to the embodiment. As shown in Figure 5, the modified base plate 10 of the 2nd example has a drain opening 11, an inclined section 12, a baffle support column 13, and appropriate anchors (not shown), similar to the base plate 10 described above. Here, in the modified example 2, the transition section 11t at the outlet section 11 of the base plate 10 includes an inner section 11ta whose lower end is connected to the connecting pipe 11c, and an outer section 11tb between the inner section 11ta and the inclined section 12. The inner section 11ta is inclined linearly from bottom to top in a cross-sectional view through the pipe axis Y. The outer section 11tb is flat along the horizontal plane. This makes the water flow above the outlet section 11 smooth, and even if the flow rate of water accumulating above the inclined section 12 is low, gravity accelerates it to reach the outlet section 11, and it can flow into the drain pipe E at a high flow velocity.

[0036] (Variation 3) Next, we will describe a third modified example of the base plate 10. Figure 6 is a cross-sectional view of the base plate 10 of modified example 3 according to the embodiment. As shown in Figure 6, the base plate 10 of the modified example 3 has a drain opening 11, an inclined portion 12, a baffle support column 13, and appropriate anchors (not shown), similar to the base plate 10 described above. Here, in the modified example 3, the transition section 11t at the outlet section 11 of the base plate 10 includes an inner section 11ta whose lower end is connected to the connecting pipe 11c, and an outer section 11tb between the inner section 11ta and the inclined section 12. The inner section 11ta is inclined linearly from bottom to top in a cross-sectional view through the pipe axis Y. The outer section 11tb is also inclined linearly from bottom to top in a cross-sectional view through the pipe axis Y. Thus, the transition section 11t at the outlet section 11 may be inclined in stages. This makes the flow of water above the outlet section 11 smooth, and even if the flow rate of water accumulating above the inclined section 12 is low, gravity accelerates it to reach the outlet section 11, allowing it to flow into the drain pipe E at a high flow velocity.

[0037] (Roof drain installation jig) Next, we will explain the roof drain installation jig 200. Figure 7 is an assembly diagram showing the roof drain installation jig 200 according to the embodiment applied to the base plate 10. Figure 8 is an exploded view showing the roof drain installation jig 200 according to the embodiment applied to the base plate 10.

[0038] As shown in Figures 7 and 8, the roof drain installation jig 200 is installed above the deck plate DP and includes a guide pipe 210 that supports the base plate 10, a support base 220 positioned at the lower end of the guide pipe 210, a bolt 230 whose lower end is connected to the support base 220 and which extends upward through the guide pipe 210, and an upper cover 240 through which the bolt 230 passes and which sandwiches the base plate 10 between the guide pipe 210 and the upper cover 240. The roof drain installation jig 200 also has nuts that can be screwed onto the bolt 230 in order to secure the upper cover 240 from above as needed.

[0039] The guide pipe 210 is a component that serves as a dam when concrete or the like for the roof slab S is poured around it, and functions as both a formwork for creating holes in the hardened concrete roof slab S and a component for positioning the base plate 10. The guide pipe 210 is a hollow cylinder. The height of the guide pipe 210 is adjusted to the height corresponding to the installation position of the base plate 10. The inner diameter of the guide pipe 210 is large enough to accommodate the connecting pipe 11c of the base plate 10.

[0040] The support base 220 is disc-shaped. The support base 220 has a main body portion 222 and a bolt support portion 221 capable of supporting the lower end of the bolt 230. The main body portion 222 is disc-shaped. The bolt support portion 221 is formed in the center of the main body portion 222. The bolt support portion 221 may be, for example, a nut fixed to the main body portion 222 by welding or the like, and having a female thread into which the lower end of the bolt 230 can be screwed. The bolt support portion 221 may also be supported by being directly screwed into the main body portion 222.

[0041] The bolt 230 is a rod-shaped body that holds down the top cover 240 from above the base plate 10, providing a watertight seal during construction before the roof drain 100 is completed. The bolt 230 has a length that is at least longer than the height of the guide pipe 210. The bolt 230 has a nut 231 that can be screwed onto a male thread provided on the bolt 230 to hold down the top cover 240.

[0042] The top cover 240 has bolt insertion holes 242 through which bolts 230 pass. Here, the top cover 240 has through-holes 241 for baffle support columns, through which the baffle support columns 13 provided in the base plate 10 pass. The through-holes 241 for baffle support columns are provided in the base plate 10 at positions corresponding to where the baffle support columns 13 are located. The deck plate DP is a component that will later be integrated with concrete or the like poured above to form the roof slab S. Thus, since the top cover 240 has through-holes 241 for baffle support columns that pass through the baffle support columns 13 provided in the base plate 10, the positioning of the base plate 10 with respect to the support base 220 can be ensured.

[0043] (Construction method) Next, we will explain the installation method for the Roof Drain 100. Figure 7 is an assembly diagram showing the roof drain installation jig 200 according to the embodiment applied to the base plate 10. Figure 8 is an exploded view showing the roof drain installation jig 200 according to the embodiment applied to the base plate 10.

[0044] The installation method for the roof drain 100 according to this embodiment includes a support base installation step S1, a guide pipe installation step S2, a base plate installation step S3, and an upper cover installation step S4. The details are as follows. (1) First, the support base 220 is installed above the deck plate DP (support base installation process S1). (2) Next, with the support base 220 in place, the guide pipe 210 is installed above the deck plate DP (guide pipe installation process S2). (3) Next, the base plate 10 is installed above the guide pipe 210 (base plate installation step S3). Here, the baffle support column 13 provided on the base plate 10 is passed through the through hole 241 for the baffle support column provided on the top cover 240. This ensures that the base plate 10 is reliably positioned relative to the position of the support base 220. (4) Next, the bolt 230 that is passed through the top cover 240 that closes the upper end of the guide pipe 210 is passed through the base plate 10 and the guide pipe 210 and connected to the support base 220 (top cover installation step S4). (5) Tighten the nuts 231 and press the top cover 240 against the top surface of the base plate 10. After this, lay protective sheet B over the top surface of the top cover 240 and the top surface of the base plate as appropriate. (6) After this, concrete or the like that which constitutes the roof slab S is poured above the deck plate DP surrounding the guide pipe 210. Then, the anchors 14 of the base plate 10 are embedded and fixed in the poured concrete or the like, and the base plate 10 is securely positioned and installed in relation to the hole in the roof slab S formed by the guide pipe 210. (7) After this, the clamp ring 20 and baffle 30 that constitute the roof drain 100 are sequentially inserted and attached to the baffle support column 13. In this way, the base plate 10 can be reliably positioned, and the roof drain 100 can be easily installed.

[0045] (Drainage performance experiment) Next, I will explain the drainage performance experiment. Figure 9 is a schematic diagram of an experiment comparing the drainage performance of the roof drain 100 with respect to the inflow rate. Figure 10 shows the relationship between the flow rate of water flowing in at inflow point P and the water level at position a. Figure 11 shows the relationship between the flow rate of water flowing in at inflow point P and the water level at position b. In Figures 10 and 11, the horizontal axis represents the flow rate of water flowing in at inflow point P (L / s). In Figures 10 and 11, the vertical axis represents the water level at position a or position b (mm).

[0046] As shown in Figure 9, the roof drain 100 according to the embodiment and the roof drain according to the comparative example were placed at installation point Q on the upper surface of the roof slab S. Water was flowed from the inlet point P at varying flow rates. Position a was set at a distance of 300 mm from installation point Q. Position b was set at a distance of 700 mm from installation point Q. The water levels at positions a and b were then measured. The inclination angle θ of the inclined section 12 in the roof drain according to the embodiment was set to 15°, and the inclination angle θ of the inclined section in the roof drain according to the comparative example was set to 5°.

[0047] As shown in Figure 10, the experimental results showed that when the roof drain 100 according to the embodiment was installed at position a, the water level was significantly lower, especially at low flow rates, compared to when the roof drain according to the comparative example was installed. A lower water level indicates that the roof drain 100 has high drainage performance. Furthermore, as shown in Figure 11, when the roof drain 100 according to the embodiment was installed at position b, the water level was significantly lower, especially at low flow rates, compared to when the roof drain according to the comparative example was installed. Thus, we were able to confirm the high drainage performance of the roof drain 100 according to the embodiment, even at low water volumes.

[0048] It should be noted that the technical scope of the present invention is not limited to the embodiments described above, and various modifications can be made without departing from the spirit of the invention.

[0049] Furthermore, without departing from the spirit of the present invention, the components in the above embodiments may be replaced with well-known components as appropriate, and the above-described modifications may be combined as appropriate. [Explanation of Symbols]

[0050] 10 base plate Top surface of 10u (base plate) 11. Outlet section 11c connecting pipe 11t transition section 11ta inner part 11tb outer part 12 Slope 13 Baffle support column 14 Anchors 20 Clamp Rings Top surface of 20u (clamp ring) 21 Clamp base 21a opening 21e Outer edge 21g through hole 22 Lip 30 baffles 31 Lid 31g through hole 32 vertical ribs 32d bottom edge 100 Roof Drain 200 Roof drain installation jig 210 Guide Pipe 220 Receiving stand 221 Bolt support section 222 Main body 230 volts 231 Nut 240 Top lid 241 Through-hole for baffle support column 242 Bolt insertion holes a,b position B Protective sheet D opening DP Deck Plate E Drain pipe HL side P inflow point Q Installation point S Roof Slab Sa hole removal Y tube axis θ Tilt angle

Claims

1. A base plate having a drain outlet portion including a connecting pipe that can be connected to a drain pipe, and an inclined portion that is inclined with respect to a plane perpendicular to the pipe axis of the connecting pipe, A clamping ring is installed above the base plate, The baffle comprises plate-shaped longitudinal ribs extending radially from the pipe axis of the connecting pipe, The clamping ring is provided with a plate-shaped clamping base that is installed above the inclined portion and whose lower surface is aligned with the upper surface of the inclined portion. The lower end of the longitudinal rib is shaped to conform to the slope of the upper surface of the clamp base, in the roof drain.

2. The roof drain according to claim 1, wherein the upper surface of the inclined portion is inclined within a range of 10° to 60° with respect to a plane perpendicular to the pipe axis.

3. The roof drain according to claim 1 or 2, wherein a lid is provided above the drain outlet.

4. The roof drain according to any one of claims 1 to 3, wherein the clamping ring has a lip provided on a plane perpendicular to the pipe axis, which is located outside the lower end of the longitudinal rib.

5. The roof drain according to any one of claims 1 to 4, characterized in that the transition section from the connecting pipe to the inclined section in the drain outlet section is tapered.

6. The roof drain according to claim 5, wherein a lid is provided above the drain outlet, and the lid is positioned to cover the transition section.

7. The roof drain according to claim 3 or 6, further comprising a support column for supporting the lid, wherein the lower end of the support column is welded to the base plate.

8. A roof slab on which a roof drain according to any one of claims 1 to 7 is installed.

9. A building having a roof drain as described in any one of claims 1 to 7.

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