Drainage Device

Abstract

To provide a drain device having excellent mounting workability with low cost, and capable of effectively suppressing falling of a strainer.SOLUTION: A drain device 10 has: a drain body 13 having a circular pipe 13d connected to a drain pipe 3, a flat plate part 13a formed with a circular opening 13c for connecting the circular pipe 13d and a beam part 13e arranged to be hung over the circular opening 13c; a strainer 11 covering the circular opening 13c; and a connection device 12 connecting the drain body 13 to the strainer 11. The connection device 12 has: a hook part 12i hooked to the beam part 13e; a shaft part extending from the hook part 12i to the outside of the strainer 11; and knurling nuts 12b, 12c engaged with a male screw 12a of the shaft part.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a drain device. [Background technology]

[0002] A waterproof layer is installed on the rooftop of a building to prevent rainwater leaks. A drain device is also provided to drain rainwater and melted snow water that accumulates on the waterproof layer. The drain device is connected to drainage pipes installed inside and outside the building, and is configured to collect water that accumulates on the waterproof layer and drain it through the drainage pipes to a rainwater basin or the like. A strainer is generally attached to the drain device to prevent foreign objects such as garbage from entering the drainage pipes.

[0003] However, waterproofing layers require repair work at regular intervals to maintain their waterproofing function. One method of repair work is the total replacement method, in which the existing waterproof layer is removed and a new waterproof layer is installed.

[0004] On the other hand, a cheaper method than the total replacement method is the overlay method (or covering method), in which a new waterproof layer is laid on top of the existing waterproof layer while leaving it in place. With the overlay method, the waterproof function can be further improved by layering a new waterproof layer on top of the existing waterproof layer.

[0005] Regardless of which construction method is used, the drain device must be reinstalled before the waterproofing layer is laid, and in that case, the drain body and drainage pipe used in the existing drain device will be reused.

[0006] In such cases, after removing the existing drain system, a new drain system known as a retrofit double drain is installed and connected to the existing drain pipe, which simplifies the retrofit work and shortens the construction period.

[0007] In many cases, the existing strainer is fixed to the existing drain body with bolts or the like. During renovation, the bolts are removed so as not to interfere with the installation of the new drain device. In such cases, there is a problem of how to attach the strainer to the new drain device.

[0008] Therefore, a new structure has been proposed in which a leaf spring is provided on the strainer that can be inserted into the connecting pipe of the drain device, and the strainer is fixed to the drain by the friction force generated when the leaf spring comes into contact with the inner wall surface of the connecting pipe with its elastic force.

[0009] However, in a strainer with such a structure, it is only fixed to the new drain device by the frictional force between the leaf spring and the connecting pipe. Therefore, this frictional force decreases when water adheres to the inner wall of the connecting pipe, and when exposed to strong winds, the frictional force cannot withstand the force in the direction of pulling the strainer out, and the strainer may come off the drain.

[0010] In response to this, Patent Document 1 discloses a fixing bracket for fixing the drain cap body as a strainer to a renovated double drain, which is configured to include a support member and a connecting member made of a flexible, elastic, linear or plate-shaped member, and the connecting member is curved so as to be convex toward the inside of the drain cap body, with both ends being engaged with the renovated double drain. [Prior art documents] [Patent documents]

[0011] [Patent Document 1] Patent No. 6712690 specification Summary of the Invention [Problem to be solved by the invention]

[0012] According to the configuration of Patent Document 1, a frame material that is screw-connected to a height adjustment screw connected to a drain cap and a connecting member are connected via a detachment means. When attaching the drain cap, an end of the connecting member is attached to a connecting protrusion of the renovated double drain, and the frame material and the connecting means are connected via the detachment means, and the drain cap is fixed to the renovated double drain by rotating the drain cap.

[0013] The drain cap attached to the double drain for renovation in this way has a structure in which the detachment means detaches the frame material and the connecting member, so when a certain load is applied, for example, when a strong wind blows, the drain cap may fly off. Also, there is a risk that the screw connection between the height adjustment screw and the frame material may become loose due to vibrations caused by being blown by the wind.

[0014] In addition, the configuration of Patent Document 1 has a large number of parts, which requires parts management and is costly.

[0015] In view of the above problems, an object of the present invention is to provide a drain device that is low cost, has excellent installation workability, and can effectively prevent the strainer from falling off. [Means for solving the problem]

[0016] In order to solve the above problems, one representative drain device of the present invention is as follows: A drain body including a tube portion connected to a drain pipe, a plate portion having an opening to which the tube portion is connected, and a beam portion disposed so as to span the opening; A strainer covering the opening; A connecting device that connects the drain body and the strainer, The coupling device comprises: A hook portion for hooking onto the beam portion and a hook member having a first male thread portion; A male screw having a second male screw portion that is inserted from the outside into a hole formed at the top of the strainer; a nut that engages with the second male threaded portion outside the hole; a connecting shaft body having a first female threaded portion at one end that engages with the first male threaded portion and a second female threaded portion at the other end that engages with the second male threaded portion; having This is achieved by: Effect of the Invention

[0017] According to the present invention, it is possible to provide a drain device which is low in cost, has excellent installation workability, and can effectively prevent the strainer from falling off. Problems, configurations and effects other than those described above will become apparent from the following description of the embodiments. [Brief description of the drawings]

[0018] [Figure 1] FIG. 1 is a cross-sectional view showing a drain device according to a first embodiment in a state where it is installed on a roof. [Diagram 2] FIG. 2 is an exploded perspective view of the drain device according to the first embodiment. [Diagram 3] FIG. 3 is a cross-sectional view showing the drain device of the second embodiment in a state where it is attached to a rooftop. [Figure 4] FIG. 4 is an exploded perspective view of the drain device according to the second embodiment, as viewed from the strainer side. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] [First embodiment] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Fig. 1 is a cross-sectional view showing a drain device of a first embodiment in a state where it is installed on a roof. Fig. 2 is a perspective view showing the drain device of the first embodiment in an exploded state.

[0020] (Drain device configuration) First, the configuration of the drain device 10 of this embodiment for vertical pulling will be described with reference to FIG. In FIG. 2, the drain device 10 has a strainer 11, a connecting device 12, and a drain body 13.

[0021] The strainer 11 is made up of a top 11a, a number of vertical pillars 11b extending downward from the top 11a at equal angles to the axis and arranged at regular intervals in the circumferential direction, intermediate connecting parts 11c connecting the middle parts of adjacent vertical pillars 11b, and lower end connecting parts 11d connecting the lower ends of adjacent vertical pillars 11b. An opening 11e is formed in the top 11a.

[0022] The connecting device 12 has a male screw 12a, cylindrical knurled nuts 12b and 12c with knurls formed on the outer periphery, a flat washer 12d, a spring washer 12e, a connecting shaft body 12f, and a hook member 12g. The hook member 12g has a male screw portion 12h at its upper end and a hook-shaped hook portion 12i at its lower end. The cylindrical connecting shaft body 12f has a female screw hole 12j at its upper end that engages with the male screw 12a, and a female screw hole 12k at its lower end that engages with the male screw portion 12h of the hook member 12g. The male screw 12a, the connecting shaft body 12f, and the hook member 12g form a shaft portion.

[0023] The drain body 13 is made up of a flat plate portion 13a made of a relatively thin metal plate (e.g., copper plate), a recessed portion 13b formed in the center of the flat plate portion 13a, and a circular pipe (tubular portion) 13d connected to a circular opening 13c formed in the center of the recessed portion 13b. A beam portion 13e is disposed in the radial direction of the circular opening 13c so as to span the circular opening 13c.

[0024] The beam portion 13e is formed from the same type of metal wire as the drain body 13, and both ends thereof are fixed to the recessed portion 13b near the circular opening 13c by brazing, welding, etc. The beam portion 13e is bent in a U-shape so that the center portion is away from the circular opening 13c.

[0025] It is preferable that the connecting device 12 is assembled to the strainer 11 in advance. To explain the assembly in detail, the male threaded portion 12h of the hook member 12g is engaged with the female threaded hole 12k of the connecting shaft body 12f, and these are arranged inside the strainer 11. Furthermore, in a state where the knurled nuts 12b, 12c, the flat washer 12d, and the spring washer 12e are engaged with the male thread 12a in this order, the lower end of the knurled nuts 12b, 12c are inserted into the opening 11e of the strainer 11, and the lower end of the male thread 12a is engaged with the female threaded hole 12j of the connecting shaft body 12f arranged inside the strainer 11. It is preferable to screw the knurled nuts 12b, 12c to a position close to the head side of the male thread 12a.

[0026] (Installation of drain device) Next, with reference to FIG. 1, an installation mode of the drain device 10 of this embodiment will be described. The drain device 10 of this embodiment is installed by removing at least a part of an existing drain device that has been used until then, for example, for the purpose of improving the waterproof structure. As a preliminary step, the strainer and waterproof layer holder of the existing drain device, and the surrounding waterproof layer as necessary, are removed.

[0027] At this time, as shown in Figure 1, a shallow dish-shaped drain base 2 with a hole 2a in the center and a drain pipe 3 connected to the hole 2a of the drain base 2 and extending downward from the vertical opening 1a of the waterproof base 1 remain on the waterproof base (RC, PC, ALC, W, etc.) 1 placed on the roof of the building. For this reason, it is necessary to assemble a new drain device taking into consideration the existing drain device.

[0028] First, the drain body 13 is attached alone to the existing drain base 2. Here, since the circular pipe 13d of the drain body 13 has an outer diameter smaller than the inner diameter of the drain pipe 3, the circular pipe 13d can be inserted into the inside of the drain pipe 3 for connection. When the circular pipe 13d is inserted into the inside of the drain pipe 3, the recess 13b of the drain body 13 is positioned above the drain base 2.

[0029] The recess 13b is formed to match the shape of the drain base 2, which is a shallow dish.

[0030] Meanwhile, the flat plate portion 13a of the drain body 13 is located on the upper surface of the waterproofing base 1 around the drain base 2. At this time, it is desirable to fix the lower surface of the flat plate portion 13a and the upper surface of the waterproofing base 1 using an adhesive sheet or an anchor or the like, taking into consideration wind pressure resistance and fitting. Also, since the flat plate portion 13a is a relatively thin metal plate, even if the upper surface of the waterproofing base 1 has some irregularities, the flat plate portion 13a can be made to fit the upper surface by tapping it from above, thereby increasing the degree of adhesion. The existing waterproof layer is indicated by the symbol 4.

[0031] Furthermore, a waterproof layer 5 is laid on the upper surface of the flat plate portion 13a and the recessed portion 13b of the drain body 13 up to the vicinity of the edge of the circular opening 13c. The waterproof layer 5 may be, but is not limited to, an asphalt waterproof layer, a sheet waterproof layer, a coating waterproof layer, etc. The thickness of the waterproof layer 5 varies depending on the material and construction method, but is about 1 mm to 15 mm.

[0032] After installing the waterproof layer 5, the strainer 11 incorporating the connecting device 12 is installed. While holding the male screw 12a, the worker abuts the lower end of the vertical column portion 11b on the waterproof layer 5 to erect the strainer 11, and then hooks the hook portion 12i of the hook member 12g onto the center of the beam portion 13e of the drain body 13.

[0033] In this state, flat washer 12d and spring washer 12e fall along male thread 12a due to their own weight and approach top 11a of strainer 11, but there is a distance between knurled nuts 12b, 12c and strainer 11. Then, the worker grasps knurled nuts 12b, 12c with his / her fingers and rotates them around male thread 12a, screwing them toward top 11a.

[0034] After the lower knurled nut 12c reaches the flat washer 12d, the worker rotates the knurled nut 12c until the spring washer 12e is compressed by a predetermined amount, and then rotates the upper knurled nut 12b in the same direction until it abuts against the knurled nut 12c and is fixed in place.

[0035] This determines the length of the shaft from the top 11a to the lower end of the hook member 12g, preventing the hook 12i from falling off the beam 13e. In addition, by making the outer diameter of the knurled nuts 12b and 12c 20 mm or less, the torque generated in the knurled nuts 12b and 12c when the worker turns them with his or her fingers is not too large, thereby suppressing damage to the beam 13e.

[0036] According to this embodiment, the relative positions of the male thread 12a and the knurled nuts 12b, 12c can be changed depending on the thickness of the waterproof layer 5. In other words, the strainer 11 can be easily attached regardless of the thickness of the waterproof layer 5, and the same strainer 11 can be used regardless of the drain port diameter of the drain device for renovation, thereby enabling standardization of parts.

[0037] As is clear from FIG. 1, the waterproof layer 5 installed on the existing waterproof layer 4 is higher than the waterproof layer 5 installed on the upper surface of the flat plate portion 13a and the recessed portion 13b. Therefore, rainwater that drops onto the waterproof layer 5 flows toward the circular opening 13c and does not form a puddle. Furthermore, rainwater that passes through the gaps between the vertical pillar portions 11b of the strainer 11 enters the circular opening 13c and is then drained through the drain pipe 3. At this time, garbage in the rainwater is captured by the strainer 11. Even if relatively small garbage passes through the strainer, it is unlikely to get caught and block the flow because the center of the beam portion 13e is bent upward in a U-shape.

[0038] According to this embodiment, even if the strainer 11 is exposed to strong winds, the hook portion 12i will not come off the beam portion 13e, and the connecting device 12 will maintain the state of being fixed upright to the waterproof layer 5. In particular, since the knurled nuts 12b and 12c abut against each other by the double nut function, the knurled nuts 12b and 12c are prevented from loosening even when vibrations due to wind occur, and the strainer 11 can be maintained stably for a long period of time.

[0039] [Second embodiment] Fig. 3 is a cross-sectional view showing the drain device 20 of the second embodiment in a state where it is attached to a rooftop. Fig. 4 is an exploded perspective view of the drain device 20 of the second embodiment as viewed from the strainer side.

[0040] (Drain device configuration) First, the configuration of the drain device 20 of this embodiment, which is for lateral drawing, will be described with reference to Figs. 3 and 4, the drain device 20 has a strainer 21, a connecting device 12, and a drain body .

[0041] The strainer 21 includes a pair of strainer members 21a, 21b and a pivot portion 21c that rotatably connects the pair of strainer members 21a, 21b.

[0042] The strainer members 21a, 21b are formed, for example, by a mold, and each have a substantially rectangular grating portion 21d, 21e and comb-tooth portions 21f, 21g extending at right angles from both sides of the grating portion 21d, 21e.

[0043] Grating portions 21d, 21e have a plurality of bars formed at equal intervals, and comb teeth formed on comb teeth portions 21f, 21g are also formed at equal intervals, which makes it possible to prevent the passage of foreign objects. In addition, the length of the plurality of comb teeth formed on comb teeth portions 21f, 21g from grating portions 21d, 21e gradually increases toward pivot portion 21c.

[0044] A plurality of short teeth 21h, 21i are alternately arranged and opposed to each other on opposing side edges of the strainer members 21a, 21b, respectively.

[0045] The connecting device 12 is the same as that in the first embodiment, and therefore the same reference numerals are used and the description is omitted. In other words, the connecting device 12 can be made common between the vertical pull drain device 10 and the horizontal pull drain device 20, thereby reducing costs.

[0046] The drain body 23 is formed by connecting a vertical plate portion 23a and a horizontal plate portion 23b made of a relatively thin metal plate, and a circular pipe (tube portion) 23d connected to a circular opening 23c formed at the lower end of the vertical plate portion 23a. A beam portion 23e is horizontally disposed in the radial direction of the circular opening 23c so as to span across the circular opening 23c.

[0047] The beam portion 23e in this embodiment is rod-shaped, and both ends thereof are fixed to the vertical plate portion 23a near the circular opening 23c by brazing, welding, etc. The beam portion 23e is preferably disposed above the center of the circular opening 23c.

[0048] (Installation of drain device) Next, with reference to FIG. 3, an installation mode of the drain device 20 of this embodiment will be described. The drain device 20 of this embodiment is installed by removing at least a part of an existing drain device that has been used until then, for example, for the purpose of improving the waterproof structure. As a preliminary step, the strainer and waterproof layer holder of the existing drain device, and the surrounding waterproof layer as necessary, are removed.

[0049] At this time, as shown in Fig. 3, the waterproof base (RC, PC, ALC, W, etc.) 1 arranged on the side wall of the roof of the building will have a drain base 2 with a hole 2a and a drain pipe 3 connected to the hole 2a of the drain base 2, which penetrates the side wall from the horizontal opening 1a of the waterproof base 1 and then extends downward. For this reason, it is necessary to assemble a new drain device taking into consideration the existing drain device.

[0050] First, the drain body 23 is attached alone to the existing drain base 2. Here, since the circular pipe 23d of the drain body 23 has an outer diameter smaller than the inner diameter of the drain pipe 3, the circular pipe 23d can be inserted into the inside of the drain pipe 3 for connection. When the circular pipe 23d is inserted into the inside of the drain pipe 3, the vertical plate portion 23a of the drain body 23 is located on the side of the waterproof foundation 1 around the drain base 2, and the horizontal plate portion 23b is located on the upper surface of the waterproof foundation 1 around the drain base 2.

[0051] At this time, it is desirable to fix the vertical plate portion 23a and the horizontal plate portion 23b to the waterproof base using an adhesive sheet or anchors, etc., taking into consideration wind pressure resistance and fitting. Furthermore, since the vertical plate portion 23a and the horizontal plate portion 23b are relatively thin metal plates, even if there are some irregularities on the top surface of the waterproof base 1 or even if the waterproof base 1 is not formed at a right angle, the vertical plate portion 23a and the horizontal plate portion 23b can be made to blend with the waterproof base 1 by tapping them from the surface side, thereby increasing the degree of adhesion. The existing waterproof layer is indicated by the symbol 4.

[0052] Furthermore, a waterproof layer 5 is laid on the surfaces of the vertical plate portion 23a and the horizontal plate portion 23b of the drain body 23 up to the vicinity of the edge of the circular opening 23c. The waterproof layer 5 may be, but is not limited to, an asphalt waterproof layer, a sheet waterproof layer, a coating waterproof layer, etc. The thickness of the waterproof layer 5 varies depending on the material and construction method, but is about 1 mm to 15 mm.

[0053] After the waterproof layer 5 is installed, the strainer 21 with the connecting device 12 attached is attached. In this embodiment, the male screw 12a is inserted into the gap between the central short tooth portions 21h, 21i that are arranged beforehand between the strainer members 21a, 21b, and is connected to the connecting shaft body 12f and the hook member 12g. The flat washer 12d and the spring washer 12e are positioned outside the short tooth portions 21h, 21i because they cannot pass through the gap between the short tooth portions 21h, 21i.

[0054] The worker brings the strainer 21 close to the waterproof layer 5 to be installed, and rotates the strainer members 21a, 21b relatively via the pivot portion 21c to correspond to the angles of the vertical and horizontal planes, so that the comb tooth portions 21f and 21g abut against the waterproof layer 5 on the vertical flat portion 23a and horizontal flat portion 23b of the drain body 23.

[0055] Then, while holding the male screw 12a, the worker hooks the hook portion 12i of the hook member 12g onto the beam portion 23e of the drain body 23. In this state, the flat washer 12d and the spring washer 12e move downward along the male screw 12a due to their own weight and approach the short tooth portions 21h, 21i, but there is a distance between the knurled nuts 12b, 12c and the short tooth portions 21h, 21i. Therefore, the worker holds the knurled nuts 12b, 12c with his / her fingers and rotates them around the male screw 12a, screwing them toward the short tooth portions 21h, 21i.

[0056] After the lower knurled nut 12c reaches the flat washer 12d, the worker rotates the knurled nut 12c until the spring washer 12e is compressed by a predetermined amount, and then rotates the upper knurled nut 12b to abut against the knurled nut 12c and secure it in place.

[0057] This determines the length of the shaft from the short tooth portions 21h, 21i to the lower end of the hook member 12g, preventing the hook portion 12i from falling off the beam portion 23e. According to this embodiment, since the strainer members 21a, 21b can rotate around the pivot portion 21c, even if the waterproof base 1 is not formed at a right angle, the ends of the comb tooth portions 21f, 21g are brought into close contact with the vertical and horizontal waterproof layers 5 by rotating the knurled nut 12c to apply axial force to the hook member 12g, and gaps that allow the passage of foreign matter can be minimized. The male thread 12a exposed from the strainer 11 may be entirely covered with a resin cap.

[0058] As is clear from FIG. 3, the waterproof layer 5 installed on the existing waterproof layer 4 is higher than the waterproof layer 5 installed on the upper surface of the vertical flat plate portion 23a. Therefore, rainwater that drops onto the waterproof layer 5 flows toward the circular opening 23c and does not form a puddle. Furthermore, rainwater that passes through the gaps of the grating portions 21d, 21e or the comb teeth portions 21f, 21g of the strainer 21 enters the circular opening 23c and is then drained through the drain pipe 3. At this time, garbage and the like in the rainwater are captured by the strainer 21 and do not enter the drain pipe 3.

[0059] According to this embodiment, even if the strainer 21 is exposed to strong winds, for example, the hook portions 12i do not come off from the beam portions 23e, and the state in which the strainer 21 is fixed to the waterproof layer 5 by the connecting device 12 is maintained.

[0060] The present invention is not limited to the above embodiment, and various modifications can be made. For example, the drain device 10 of the present embodiment has been described as being installed during renovation. It can also be installed at the time of new construction. Also, the connecting shaft body 12f of the connecting device 12 is not essential, and the male threaded portion 12h of the hook member 12g can be extended and integrated with the male thread 12a. In such a case, the male thread does not have a head, and the male threaded portion 12h is inserted from the inside of the strainer, and the spring washer 12e, the flat washer 12d, and the knurled nuts 12b and 12c are engaged in this order with the male threaded portion 12h exposed to the outside.

[0061] In the above embodiment, a knurled nut is used as the female thread member, but as long as torque control is possible, for example, a round nut without knurling, a wing nut, a hexagonal nut, etc. can also be used as the female thread member. [Explanation of symbols]

[0062] 1. Waterproofing 2 Drain base 3 Drain pipe 4 Existing waterproof layer 5 Waterproof layer 10, 20 Drain device 11, 21 Strainer 12 Coupling device 13, 23 Drain body

Claims

1. A drain body including a tubular portion connected to a drain pipe, a plate portion having an opening to which the tubular portion is connected, and a beam portion disposed so as to span the opening; A strainer covering the opening; A connecting device that connects the drain body and the strainer, The coupling device comprises: a hook member including a hook portion to be hooked onto the beam portion and a first male screw portion; A male screw having a second male screw portion that is inserted from the outside into a hole formed at the top of the strainer; a nut that engages with the second male threaded portion outside the hole; a connecting shaft body having a first female threaded portion at one end that engages with the first male threaded portion and a second female threaded portion at the other end that engages with the second male threaded portion, A drain device characterized by:

2. The nut is a knurled nut. The drain device according to claim 1 .

3. The knurled nut is a double nut. The drain device according to claim 2 .

4. The knurled nut has an outer diameter of 20 mm or less.

4. The drain device according to claim 2 or 3.

5. The beam portion has a central portion bent upward. The drain device according to any one of claims 1 to 4.

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