JP7625491B2 - Drainage Device - Google Patents

Description

The present invention relates to a drain device.

A waterproof layer is installed on the rooftop of a building to prevent leaks. A drain device is also provided to drain rainwater and melted snow that accumulates on this waterproof layer. The drain device is connected to drainage pipes installed inside and outside the building, and is configured to collect water that has accumulated on the waterproof layer and drain it through the drainage pipe into 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 pipe.

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

On the other hand, a cheaper method compared to the full replacement method is the overlay method (or covering method), in which the existing waterproof layer is left in place and a new waterproof layer is laid on top of it. With the overlay method, the waterproof function can be further improved by layering a new waterproof layer on top of the existing waterproof layer.

Regardless of which construction method is used, the drainage system must be reinstalled before the waterproof layer is laid, and the drain body and drainage pipe used in the existing drainage system must be reused.

In such cases, the existing drain system is removed and a new drain system known as a retrofit double drain is installed and connected to the existing drain pipe. This simplifies the retrofit work and shortens the construction period.

Existing strainers are often fixed to the existing drain body with bolts or other fasteners. When renovating, the bolts are removed so as not to interfere with the installation of the new drain device. In such cases, the problem arises of how to attach the strainer to the new drain device.

A new structure has been proposed in which a leaf spring is attached to the strainer, which can be inserted into the connecting pipe of the drain device, and the strainer is fixed to the drain by the frictional force generated when the leaf spring comes into contact with the inner wall surface of the connecting pipe with its elastic force.

However, in a strainer with this type of 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 if water adheres to the inner wall of the connecting pipe, and in addition, if it is 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.

In response to this, Patent Document 1 discloses a fixing bracket that fixes the drain cap body, which serves as a strainer, to the renovated double drain, and is configured to include a support member and a connecting member made of a resilient, flexible, linear or plate-like 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.

Patent No. 6712690 specification

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

The drain cap attached to the renovated double drain in this way has a detachment means that detaches the connecting member from the frame material, so if a certain load is applied, such as 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 the wind.

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

In view of the above problems, the present invention aims to provide a drain device that is low-cost, easy to install, and can effectively prevent the strainer from falling off.

In order to solve the above problems, one representative drain device of the present invention is as follows:
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 which engages with the first male threaded portion and a second female threaded portion at the other end which engages with the second male threaded portion ,
This is achieved by:

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.

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. FIG. 2 is an exploded perspective view of the drain device according to the first embodiment. FIG. 3 is a cross-sectional view showing the drain device of the second embodiment in a state where it is installed on a roof. FIG. 4 is an exploded perspective view of the drain device according to the second embodiment, as viewed from the strainer side.

[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.

(Configuration of the drain device)
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 .

The strainer 11 is made up of a top 11a, a number of vertical column sections 11b that extend downward from the top 11a at equal angles to the axis and are arranged at regular intervals in the circumferential direction, an intermediate connecting section 11c that connects the middle of adjacent vertical column sections 11b, and a lower end connecting section 11d that connects the lower ends of adjacent vertical column sections 11b. An opening 11e is formed in the top 11a.

The connecting device 12 has a male thread 12a, cylindrical knurled nuts 12b and 12c with knurled grooves on the outer circumference, 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 thread 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 threaded hole 12j at its upper end that engages with the male thread 12a, and a female threaded hole 12k at its lower end that engages with the male thread portion 12h of the hook member 12g. The male thread 12a, the connecting shaft body 12f, and the hook member 12g form a shaft portion.

The drain body 13 is made up of a flat plate 13a made of a relatively thin metal plate (e.g., copper plate), a recess 13b formed in the center of the flat plate 13a, and a circular pipe (tube) 13d connected to a circular opening 13c formed in the center of the recess 13b. A beam 13e is also arranged in the radial direction of the circular opening 13c so as to span across the circular opening 13c.

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

It is preferable that the connecting device 12 is pre-assembled to the strainer 11. To explain the specific assembly method, 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, with the knurled nuts 12b, 12c, flat washer 12d, and spring washer 12e engaged with the male thread 12a in this order, the lower end of the knurled nuts 12b, 12c, flat washer 12d, and spring washer 12e 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.

(Installation of drain device)
Next, an installation mode of the drain device 10 of this embodiment will be described with reference to FIG.
The drain device 10 of the present 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 preparation, the strainer and waterproof layer of the existing drain device, and the surrounding waterproof layer as well as the like are removed as necessary.

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

First, the drain body 13 is attached to the existing drain base 2 by itself. Here, the circular pipe 13d of the drain body 13 has an outer diameter smaller than the inner diameter of the drain pipe 3, so the circular pipe 13d can be inserted into the inside of the drain pipe 3 to connect. 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.

The recess 13b is formed to match the shape of the shallow dish-shaped drain base 2.

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, etc., taking into consideration wind pressure resistance and fit. In addition, since the flat plate portion 13a is a relatively thin metal plate, even if the upper surface of the waterproofing base 1 is slightly uneven, the flat plate portion 13a can be made to blend in with the upper surface by tapping it from above, thereby increasing the degree of adhesion. The existing waterproof layer is indicated by the symbol 4.

Furthermore, a waterproof layer 5 is laid over the upper surface of the flat plate portion 13a and the recessed portion 13b of the drain body 13 up to near 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, or a paint film waterproof layer. The thickness of the waterproof layer 5 varies depending on the material and construction method, but is approximately 1 mm to 15 mm.

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.

In this state, the flat washer 12d and the spring washer 12e fall along the male screw 12a due to their own weight and approach the top 11a of the strainer 11, but there is a distance between the knurled nuts 12b and 12c and the strainer 11. The worker then grasps the knurled nuts 12b and 12c with his or her fingers and rotates them around the male screw 12a, twisting them toward the top 11a.

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 specified amount, and then rotates the upper knurled nut 12b in the same direction until it comes into contact with the knurled nut 12c and is fixed in place.

This determines the length of the shaft from the top 11a to the bottom 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 preventing damage to the beam 13e.

According to this embodiment, the relative positions of the male thread 12a and the knurled nuts 12b and 12c can vary 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 diameter of the renovation drain device, allowing for standardization of parts.

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 drips 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, debris in the rainwater is captured by the strainer 11. Even if relatively small debris 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.

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 upright fixed state on the waterproof layer 5. In particular, since the knurled nuts 12b and 12c abut against each other due to 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 stably established for a long period of time.

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.

(Configuration of the drain device)
First, the configuration of the drain device 20 of this embodiment, which is for lateral drainage, 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 23.

The strainer 21 has a pair of strainer members 21a, 21b and a pivot part 21c that connects the pair of strainer members 21a, 21b so that they can rotate freely.

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

The grating sections 21d and 21e have multiple bars formed at equal intervals, and the multiple comb teeth formed on the comb tooth sections 21f and 21g are also formed at equal intervals, which makes it possible to prevent the passage of foreign objects. In addition, the length of the multiple comb teeth formed on the comb tooth sections 21f and 21g from the grating sections 21d and 21e gradually increases as they approach the pivot section 21c.

On the opposing side edges of the strainer members 21a and 21b, a number of short teeth 21h and 21i are alternately arranged opposite each other.

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

The drain body 23 is made up of a vertical plate section 23a and a horizontal plate section 23b made of a relatively thin metal plate, and a circular pipe (tube section) 23d connected to a circular opening 23c formed at the lower end of the vertical plate section 23a. A beam section 23e is also arranged horizontally across the circular opening 23c in the radial direction.

In this embodiment, the beam portion 23e is rod-shaped, and both ends of the beam portion 23e are fixed to the vertical plate portion 23a near the circular opening 23c by brazing, welding, or the like. It is preferable that the beam portion 23e is positioned above the center of the circular opening 23c.

(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 the present 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 preparation, the strainer and waterproof layer of the existing drain device are removed, and the surrounding waterproof layer is also removed as necessary.

At this time, as shown in Figure 3, the waterproof base (RC, PC, ALC, W, etc.) 1 placed on the side wall of the building roof 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 account the existing drain device.

First, the drain body 23 is attached alone to the existing drain base 2. Here, the circular pipe 23d of the drain body 23 has an outer diameter smaller than the inner diameter of the drain pipe 3, so the circular pipe 23d can be inserted into the inside of the drain pipe 3 to connect. 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 base 1 around the drain base 2, and the horizontal plate portion 23b is located on the top surface of the waterproof base 1 around the drain base 2.

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.

Furthermore, a waterproof layer 5 is laid over the surfaces of the vertical plate portion 23a and the horizontal plate portion 23b of the drain body 23 up to near 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, or a paint film waterproof layer. The thickness of the waterproof layer 5 varies depending on the material and construction method, but is approximately 1 mm to 15 mm.

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 previously arranged 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.

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 part 21c so as to correspond to the angles of the vertical and horizontal planes, so that the comb teeth part 21f and the comb teeth part 21g come into contact with the waterproof layer 5 on the vertical plate part 23a and the horizontal plate part 23b of the drain body 23.

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 and 21i, but there is a distance between the knurled nuts 12b and 12c and the short tooth portions 21h and 21i. The worker then holds the knurled nuts 12b and 12c with his or her fingers and rotates them around the male screw 12a, twisting them toward the short tooth portions 21h and 21i.

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 specified amount, and then rotates the upper knurled nut 12b to abut against the knurled nut 12c and secure it in place.

This determines the length of the shaft from the short tooth portions 21h, 21i to the bottom 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, thereby minimizing gaps that allow the passage of foreign matter. The entire male thread 12a exposed from the strainer 11 may be covered with a plastic cap.

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 drips onto the waterproof layer 5 flows toward the circular opening 23c and does not form a puddle. Furthermore, rainwater that passes through the gaps in the grating portions 21d, 21e or the comb tooth portions 21f, 21g of the strainer 21 enters the circular opening 23c and is then drained through the drain pipe 3. At this time, debris and other particles in the rainwater are captured by the strainer 21 and do not enter the drain pipe 3.

According to this embodiment, even if the strainer 21 is exposed to strong winds, the hook portion 12i does not come off the beam portion 23e and remains fixed to the waterproof layer 5 by the connecting device 12.

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 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.

In the above embodiment, a knurled nut is used as the female thread member, but if torque management 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.

1 Waterproof base 2 Drain base 3 Drain pipe 4 Existing waterproof layer 5 Waterproof layer 10, 20 Drain device 11, 21 Strainer 12 Connection device 13, 23 Drain body

Claims (5)

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: The nut is a knurled nut.
The drain device according to claim 1 . The knurled nut is a double nut.
The drain device according to claim 2 . The knurled nut has an outer diameter of 20 mm or less.
4. The drain device according to claim 2 or 3. 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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