JPH07166597A - Horizontal drain pipe, support base, and flat drain pipe joint - Google Patents

Abstract

PURPOSE:To lower the underfloor of a building in height by using a space-saving flat horizontal drain pipe, a height-adjustable support base, and a flat drain pipe joint of the flat drain pipe. CONSTITUTION:An inverse triangular groove 12 for a small quantity of drain is provided on the bottom section 11 of a resin pipe (horizontal drain pipe) 10 having a flat cross section in the width direction, and a coupling groove 13 is provided on the upper face of the horizontal drain pipe 10. The drain pipe holding means 21 of a support base 20 is coupled with the bottom section 11 of the horizontal drain pipe 10 to hold the horizontal drain pipe 10 at a proper height. A drain pipe holding means fixing means 22 holds the drain pipe holding means 21. The horizontal drain pipe joint port 41 of a flat drain pipe joint 40 is closely coupled with one end of the horizontal drain pipe 10. A vertical drain pipe joint port 42 is vertically extended from the other portion of the horizontal drain pipe joint port 41, it is made flat in the width direction of the horizontal drain pipe 10, and it is closely coupled with one end of a flat vertical drain pipe.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention generally relates to a drainage pipe for sewage, a support, and a flat drainage pipe joint, and particularly to a drainage pipe flattened so that the space height under the floor or in the ceiling can be saved. The present invention relates to a support and a flat drainage pipe joint. In particular, the present invention relates to an indoor horizontal drainage pipe having a flat groove for small amount drainage at its bottom so as to prevent the horizontal drainage pipe from being boring even when a small amount of water is drained, a support, and a flat drainage pipe joint.

[0002]

2. Description of the Related Art At present, drainage pipes are made of hard vinyl chloride resin having a circular cross section that is common to both the vertical and horizontal directions. A bellows piping material made of vinyl resin is used.

[0003]

[Problems to be Solved by the Invention] The number of apartment houses has increased in recent years, and it is expected that the number will increase considerably in the future, but in order to reduce room floor height and cost, the space height under the floor or inside the ceiling should be increased. I want to keep it to a minimum. However, since a large amount of drainage flows temporarily in the horizontal drainage pipe, a large-diameter pipe is required, while a small amount of sewage sometimes flows, so a minimum water gradient is required. However, the smaller the amount of water in the circular tube, the more it flows through the central flat portion and loses momentum. If it is less than 1/100, it may cause clogging, and a gradient of about 1/50 is desirable. The diameter is 100 mm, and if there is a pipe length of 8 m, there is a drop of 160 mm.

Even with the joistless construction method, the total floor material thickness is about 40 mm,
A minimum underfloor height of 300 mm is required for a claim-free construction. In the case of rough random construction due to rising land prices in recent years, the height under the floor is sacrificed. Once the drainage becomes clogged, it is inevitable that it will take a lot of time and money, and even if it can be repaired temporarily, it must continue to have the possibility of the same accident, so that a peaceful family life can be maintained in the future. Absent. The circular cross-section pipe is suitable for water supply pipes and gas pipes with high internal pressure, but is not suitable for horizontal drainage pipes without internal pressure,
There is no technology to reliably support particularly important gradients. Other,
Circular pipes are difficult to pack, and the whole is bundled in a wasteful hexagonal shape, which requires transportation costs. Furthermore, it was also necessary to develop a joint that closely fits the following special horizontal drain pipe and vertical drain pipe.

[0005]

The drainage pipe for horizontal drawing, the support and the flat drainage pipe joint according to the present invention are as follows in view of the above problems. First of all, one of the means for solving the problem is to use a flat horizontal drainage pipe as the piping material itself because the use of a circular pipe is stopped and a small space is required. The second means for solving the problem is to provide a sharply angled cross section that forms a valley groove in the center in order to reduce the water gradient and to forcefully flow even a small amount of water that is difficult to flow.

[0006] Third, to make it easy to overlap with each other and overlap the valley portion as it is so that there is no empty space, or if the pipes are overlapped by shifting by half, they fit perfectly, and the outer lines are congruent to form a nest. , The end on the side with the valley should be near horizontal for better stability when stacking. Fourth, the horizontal notch is attached to the outside of the inner support that supports the horizontal drainage pipe, and the horizontal notch that fits with the horizontal notch is provided on the support part of the outer support base to ensure the height of the horizontal drainage pipe. Hold while confirming. Fifth, since the flat horizontal drainage pipe is wide, an extremely thick pipe is required when connecting to a circular vertical drainage pipe, so the vertical drainage pipe is also assumed to be flat and fitted closely to them. It will be a joint that fits.

The concrete constructions of the horizontal drainage pipe, the support and the flat drainage pipe joint according to the present invention will be described in detail below. First, the construction of the horizontal drainage pipe of the invention according to claim 1 of the present invention will be described. First, a pipe having a flat cross section in the width direction, such as an ellipse or a rectangle, and having a groove for discharging a small amount of water at the bottom thereof. In this small amount drainage groove, the whole or part of the bottom part of the horizontal drainage pipe is flattened downward or rounded at the tip like a triangle, a substantially triangle, a heart shape or a substantially heart shape. It is a pipe with a sharp tip.

Next, the construction of the horizontal drainage pipe according to the second aspect of the present invention of the horizontal drainage pipe, the support and the flat drainage pipe joint according to the present invention will be described. The present invention is the same as the configuration of the horizontal drainage pipe of the invention of claim 1 except for the following points. Therefore, from the whole sentence of the description of the configuration of the invention of claim 1 mentioned above, the following points are excluded and cited, and the following description of the configuration is added thereto. The difference is the presence of a fitting groove provided on the upper surface of the horizontal drainage pipe. This is a pipe in which the groove for small amount drainage of another horizontal drainage pipe is fitted into the fitting groove of this horizontal drainage pipe.

The construction of the horizontal drainage pipe support base according to the third aspect of the present invention will now be described. First, there is a drain pipe holding means. The drain pipe holding means is fitted to the bottom portion of the horizontal drain pipe described below and holds the horizontal drain pipe at an appropriate height. Then, there is a drain pipe holding means fixing means. The drain pipe holding means fixing means is fitted into the drain pipe holding means and holds the drain pipe holding means at an appropriate height. The horizontal drainage pipe is a pipe having a flat cross section in the width direction such as an ellipse or a rectangle and having a groove for draining a small amount at the bottom thereof. In this small amount drainage groove, the whole or part of the bottom part of the horizontal drainage pipe is flattened downward or rounded at the tip like a triangle, a substantially triangle, a heart shape or a substantially heart shape. It is a pipe with a sharp tip.

Finally, the construction of the flat drainage pipe joint according to the fourth aspect of the present invention of the horizontal drainage pipe, the support and the flat drainage pipe joint according to the present invention will be described. First, there is a horizontal drain pipe joint port. The horizontal drain pipe joint port is closely fitted to one end of the horizontal drain pipe described below. And there is a vertical drainage pipe fitting port. This vertical drainage pipe joint port extends vertically from the other part of the horizontal drainage pipe joint port and is flat in the width direction of the horizontal drainage pipe below, and is attached to one end of the flat vertical drainage pipe. It is a close fit. The horizontal drainage pipe is a pipe having a flat cross section in the width direction such as an ellipse or a rectangle and having a groove for draining a small amount at the bottom thereof. In this small amount drainage groove, the whole or part of the bottom part of the horizontal drainage pipe is flattened downward or rounded at the tip like a triangle, a substantially triangle, a heart shape or a substantially heart shape. It is a pipe with a sharp tip.

[0011]

The horizontal drainage pipe, the support and the flat drainage pipe joint according to the present invention have the following actions because of the above-described configuration. First, the operation of the horizontal drainage pipe according to the first aspect of the present invention will be described. First,
The cross section in the width direction is flat such as an ellipse or a rectangle, and the water gradient is gentle, so the height required for the gradient is small, so the space under the floor or in the ceiling is saved. Since the pipe has a groove for discharging a small amount of water at the bottom thereof, the sewage flows vigorously to prevent the lateral drainage pipe from being blocked even when a small amount of water is discharged.

Next, the operation of the horizontal drainage pipe according to the second aspect of the present invention of the horizontal drainage pipe, the support and the flat drainage pipe joint according to the present invention will be described. This invention is the same as the operation of the horizontal drainage pipe of the invention of claim 1 except for the following points. Therefore, the following points are excluded from the whole sentence of the explanation of the operation of the invention of claim 1 above, and the following explanation of the action is added thereto. The difference is the presence of a fitting groove provided on the upper surface of the horizontal drainage pipe. The horizontal drainage pipe is fitted into the fitting groove on the upper surface thereof, and is fitted into the groove for discharging a small amount of the other horizontal drainage pipe.

The operation of the horizontal drainage pipe support base and the flat drainage pipe joint support according to the present invention will be described. This means that first, the drain pipe holding means is fitted to the bottom portion of the drain pipe described below and holds the laterally drawn drain pipe at an appropriate height. Then, the drain pipe holding means fixing means is fitted to the drain pipe holding means and holds the drain pipe holding means at an appropriate height. The horizontal drainage pipe saves space under the floor or in the ceiling because the cross section in the width direction has a flat shape such as an ellipse or a rectangle. Since the pipe has a groove for discharging a small amount of water at the bottom thereof, the lateral drainage pipe is prevented from being blocked even when a small amount of water is discharged.

Finally, the operation of the flat drainage pipe joint according to claim 4 of the horizontal drainage pipe, the support and the flat drainage pipe joint installed in the building according to the present invention will be described. This is because the horizontal drainage pipe fitting port first fits closely to one end of the horizontal drainage pipe below, and the vertical drainage pipe fitting port extends vertically from the other part of this horizontal drainage pipe fitting port. therefore,
It fits tightly to one end of the flat vertical drainage pipe. The horizontal drainage pipe saves space under the floor or in the ceiling because the cross section in the width direction has a flat shape such as an ellipse or a rectangle. Since the pipe has a groove for discharging a small amount of water at the bottom thereof, the lateral drainage pipe is prevented from being blocked even when a small amount of water is discharged.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A horizontal drainage pipe, a support and a flat drainage pipe joint according to the present invention will be described below in detail with reference to the accompanying drawings by using an embodiment thereof. FIG. 1 is a front view showing an embodiment of a horizontal drainage pipe and a support base according to the present invention. FIG. 2 is a reduced perspective view showing a state in which a large number of those shown in FIG. 1 are stacked. This is a pipe that has a groove for discharging a small amount of water at the bottom of a flat drainage pipe.

First, an embodiment of the drainage pipe for horizontal drawing according to the first aspect of the present invention will be described. First, as shown in FIG. 1, there is a flat resin pipe (lateral drainage pipe) 10 having a cross section in the width direction such as an ellipse or a rectangle. The bottom portion 11 is a pipe having a groove 12 for discharging a small amount of water. This small drainage groove is the bottom part 1 of the horizontal drainage pipe.
1 is a pipe with a pointed shape in which the tip is rounded down flat like a substantially heart shape. The pointed shape may be a pipe in which a part of the bottom portion 12 is pointed in a triangular shape, a substantially triangular shape, or a heart shape. Similarly, the entire bottom 11 may be a pipe having a triangular shape, a substantially triangular shape, or a sharp heart shape.

Next, in one embodiment of the horizontal drainage pipe of the present invention according to claim 2 of the horizontal drainage pipe, the support and the flat drainage pipe joint according to the present invention, the horizontal drainage shown in FIG. As shown in the reduced perspective view of a state in which a large number of drainage pipes are stacked and stacked, the fitting groove 13 provided on the upper surface of the horizontal drainage pipe 10 is provided with a groove 12 for small amount drainage of another horizontal drainage pipe.
Is a pipe that fits.

An embodiment of the horizontal drainage pipe support 20 according to the present invention of the horizontal drainage pipe, the support base and the flat drainage pipe joint according to the present invention will now be described. First, as shown in FIG. 3, there is a drain pipe holding means 21 made of resin. The drain pipe holding means 21 is fitted to the bottom portion 11 of the horizontal drain pipe described below and holds the horizontal drain pipe 10 at an appropriate height. Then, there is the drain pipe holding means fixing means 22. This drain pipe holding means fixing means 2
Reference numeral 2 is for fitting the drain pipe holding means 21 and holding the drain pipe holding means 21 at an appropriate height. The horizontal drainage pipe 10 is the same as the embodiment of claim 1 described above, but may be the same as the embodiment of claim 2 described above. Of course, this fitting is not limited to the same shape, because the fitting may simply have a shape that is difficult to fit. Further, on both sides of the drainage pipe holding means 21, there are height adjusting means 21a provided with a large number of notches N in the horizontal direction, which are fitted into the large number of notches N of the drainage pipe holding means fixing means 22. The height is adjusted. Further, a hook 30 may be provided on the drain pipe holding means fixing means 22 and the drain pipe holding means 21 so that the upper portions thereof are not opened.

Finally, an embodiment of the flat drainage pipe joint 40 of the invention according to claim 4 of the horizontal drainage pipe, the support and the flat drainage pipe joint according to the present invention will be described. First, there is a horizontal drain pipe joint port 41 made of synthetic resin or metal. The horizontal drainage pipe joint port 41 is closely fitted to one end of the horizontal drainage pipe 10. And, there is a vertical drainage pipe joint port 42. This vertical drainage pipe fitting port 4
2 extends vertically from the other side of the horizontal drainage pipe joint port 41, is flat in the width direction of the horizontal drainage pipe 10 and is provided at one end of a flat vertical drainage pipe (not shown). It is a close fit. Vertical drainage pipe fitting port 4 above
Two may be provided below the side sectional view shown in FIG. 4, or may be provided above and below the perspective view shown in FIG. 5 and the side sectional view shown in FIG. Good.

Specific examples of the present invention will be described below. As shown in Fig. 1, the width of the inner wall is 130mm, the height of the horizontal wall is 60mm, the depth of the central dent and the height of the convex are 20mm, and the wall thickness is 5mm. The cross-sectional area is approximately equal to the cross-sectional area of a circular horizontal drainage pipe with an inner diameter of 100 mm and a wall thickness of 5 mm. A resin U-shaped stand with a height of 200 mm, a length of 50 mm, an outer width of 150 mm, a horizontal notch with a pitch of 5 mm on the inside of its support, and a shallow groove on the bottom back surface parallel to the notch. Adhere to the floor surface through which the horizontal drainage pipe passes through with an adhesive on the back surface at a pitch of about 1,000 mm. It is sufficient that the horizontal drainage pipe can be held without the shallow groove.

Next, an H-shaped support tool with a horizontal notch made of resin is applied to the bottom of the angular substantially heart-shaped horizontal drain pipe,
The horizontal notch of the support is inserted laterally into the horizontal notch of the U-shaped stand at a predetermined gradient height to support the horizontal drainage pipe. At that time, the horizontal member of the H-shaped support is bent in a V-shape along the bottom surface of the substantially heart-shaped horizontal drainage pipe, and at the same time, the pipe is inclined in the gradient direction in advance. . If desired, the U-shaped stand and the H-shaped support, and the H-shaped support and the substantially rectangular heart-shaped horizontal drain pipe may be bonded. It should be noted that the U-shaped stand and the H-shaped support are not made of resin, and may be made by pressing a steel plate. The above size is an example, and square substantially heart-shaped horizontal drainage pipes with various thicknesses and thicknesses can be made, and also a supporting tool and a stand thereof can be made.

In another embodiment of the present invention, as shown in FIG. 3, if the substantially heart-shaped horizontal drain pipes are stacked upside down,
In addition to having a laterally long cross section, the protruding part of the groove fits into the recess on the top surface and is very stable, allowing for storage and transportation. As another embodiment, a ginkgo-based horizontal drainage pipe having an inner dimension of 130 mm in width, a horizontal wall height of 50 mm, a central recess depth and a convex height of 20 mm, and a wall thickness of 5 mm. The cross-sectional area of is approximately equal to that of a circular tube with an inner diameter of 100 mm and a wall thickness of 5 mm.
The height is 200 mm, the length is 30 mm, the outer width is 150 mm, the support base has a horizontal notch with a pitch of 5 mm, and many small holes are formed on the back surface of the bottom. The stand is fixed by driving concrete nails into the small holes at a pitch of about 2000 mm on the floor surface through which the horizontal drainage pipe is passed.

Next, the horizontal notch of the H-shaped support made of pressed steel plate is placed under the ginkgo-based horizontal drainage pipe, and the horizontal notch of the support is U at a predetermined gradient height. The horizontal stand-out drainage pipe is supported by inserting it horizontally into the horizontal notch of the stand. At that time, the horizontal member of the H-shaped support is bent in a V-shape along the bottom surface of the ginkgo base-shaped horizontal drainage pipe, and at the same time, the inclination of the pipe is preliminarily inclined to the end, The part is bent downward and horizontal notched. If necessary,
The U-shaped stand and the H-shaped support, or the H-shaped support and the substantially rectangular heart-shaped tube may be bonded. The U-shaped stand and the H-shaped support may be made of resin instead of steel plate. The above size is an example, and a ginkgo-based horizontal drain pipe of various thicknesses and thicknesses can be made, and a supporting tool and a stand thereof can also be made.

As another embodiment, as shown in FIG. 2, if the ginkgo-based horizontal drainage pipes are stacked upside down by shifting them half by half, they have a horizontally long cross section and groove The protruding part fits into the dent on the upper surface and is very stable,
Can be stored and transported. As another embodiment, as shown in FIG. 4, the inner dimension is 130 mm in width, and the height of the side wall is 60 mm.
The depth of the center recess is 20 mm, the height of the protrusion is 20 mm, the wall thickness is 5 mm, and the inner wall is bent 90 degrees horizontally so that the inner wall rotates with a radius of 15 mm. Make a square-shaped heart-shaped bent connection drainage pipe with 5 mm wide in both length and width, insert the corner-shaped substantially heart-shaped drainage pipe with adhesive on both ends, and connect the 90-degree bent part To do. The above size is an example, and a rectangular substantially heart-shaped drain pipe with various bending angles, thicknesses, and thicknesses, or a ginkgo-based drain pipe can be manufactured. Of course, you can also make a connecting pipe that connects in a straight line without bending.

Further, as another embodiment, as shown in FIG. 5, a ginkgo tree having an inner dimension of 130 mm in width, a lateral wall height of 50 mm, a central recess depth and a convex height of 20 mm, and a wall thickness of 5 mm. The vertical dimension of the base drainage pipe is 130 mm x 60 mm.
The angled drainage pipes are connected to each other with a water gradient in the direction in which the widths are even, and the inner dimensions of the 50 mm outer ends of each of these connection ports are expanded by 5 mm in both length and width. Make a drainage pipe for connection, insert the Ginkgo base type drainage pipe of the example with an adhesive at the entrance, and insert it in the vertical direction 130
mm × 60mm square drainage pipe Attach an adhesive to the top and bottom of the drainage pipe to connect it. The above size and shape are examples, and the vertical vertical tube is changed to a circular vertical tube, various thicknesses and thicknesses, connection angles, and ginkgo-based drainage pipes that are horizontally connected are also changed in thickness and thickness. It is also possible to use an angular substantially heart-shaped drain pipe as in the example. Of course, conversely you can also make a connecting pipe that connects horizontally from a vertical pipe.

As yet another embodiment, as shown in FIG. 6, the inner dimension is 130 mm in width, and the height of the horizontal wall is 60 mm.
The depth of the center dent and the height of the protrusion are 20 mm, the wall thickness is 5 mm, and the inner wall is bent 90 degrees horizontally so that the inner wall side rotates with a radius of 80 mm, while one of the connection ports is straight so
The drainage pipe for converging connection is formed in the shape of a square heart, which is expanded by 200 mm and the inner dimension of the outer end of 50 mm of each connection port is expanded by 5 mm in both length and width. Attach an adhesive to the mouth and connect the confluence. The above dimensions are examples, and various bending angles, thicknesses,
You can make thick square heart-shaped drain pipes or ginkgo-based drain pipes. Of course, it is also possible to make a connecting pipe that joins the straight drain pipe from both sides.

[0027]

As described above, the drainage pipe for horizontal drawing, the support and the flat drainage pipe joint according to the present invention have the following great effects. That is, according to the present invention, the following excellent effects are brought about by forming and attaching the drainage pipe, the support and the flat drainage pipe joint of the above-mentioned embodiment. (1) Since the drainage flows vigorously even on a gentle water gradient, the required height below the floor or inside the ceiling can be reduced. (2) Since the horizontal drainage pipe itself can reduce the total thickness, the required height under the floor or in the ceiling can be reduced. (3) If the height under the floor or inside the ceiling is reduced, the total height of the building is also reduced, and the building can be removed in a sliced shape, so that the construction can be cheaper. (4) Since the horizontal drainage pipes can be placed on top of each other to prevent them from shifting, inventory management and transportation costs are reduced. (5) Since a support tool that can easily set the horizontal drainage pipe at the correct slope can be used, the construction work will proceed rapidly and the construction cost will be reduced. (6) Square drainage pipes save space when stocked, transported, or stored in pipe space. (7) A joint that can be fitted appropriately to the horizontal drain pipe and the vertical drain pipe.

In this way, since the equipment pipe space is usually narrow and has a rectangular flat surface, the rectangular drain pipe can be stored in the space without waste in a drain pipe having a large diameter. In particular, a horizontal pipe has a vertical force acting on the pipe, and in the case of the same cross-sectional area, the second moment of area is larger than that of a square pipe by more than 10%, so the fulcrum interval can be set to be longer than 10%. Further, in the substantially heart shape, the irregular shape portion also contributes to the strength. If the central valley groove has an acute-angled cross section, especially the cross-sectional shape like the root of the ginkgo leaf shaft,
The less water there is, the deeper the water becomes as a ratio, and even a small amount of water flows well, and the water gradient can be lowered to 1/100 or less, so the required space height under the floor or inside the ceiling can be suppressed to about half. You can stack the uneven parts of the top and bottom of the almost heart shape as it is,
Shift the tubes by half so that they overlap exactly, and make them near horizontal at the end on the valley side. When putting them all together on a transport vehicle and tightening the band, it is possible to avoid a situation in which the cargo is tied up stably and the load collapses.

[Brief description of drawings]

FIG. 1 is a front cross-sectional view of an embodiment of a drainage pipe for horizontal drawing and a support base according to claims 1 and 3.

FIG. 2 is a perspective view showing a large number of stacked drainage pipes according to an embodiment of the present invention.

FIG. 3 is a perspective view showing a large number of stacked lateral drainage pipes according to an embodiment of the present invention.

FIG. 4 is a side sectional view of an embodiment of the flat drainage pipe joint according to claim 4;

FIG. 5 is a perspective view of another embodiment of the flat drainage pipe joint according to claim 4;

FIG. 6 is a side sectional view of the flat drainage pipe joint shown in FIG. 4.

[Explanation of symbols]

 10 Horizontal drainage pipe 11 Bottom part 12 Groove for small amount drainage 13 Fitting groove 20 Supporting base 21 Drainage pipe holding means fixing means 22 Drainage pipe holding means fixing means 40 Flat drainage pipe joint 41 Horizontal pulling drainage pipe joint port 42 Vertical pulling Drain pipe fitting port

Claims (4)

[Claims] 1. A cross-section in the width direction has a flat shape such as an ellipse or a rectangular shape, and all or part of the bottom portion thereof has a flat pointed downward shape such as a triangle, a substantially triangle, a heart shape, or a substantially heart shape. A horizontal drainage pipe comprising a pipe having a rounded pointed sharpened groove for small amount drainage. 2. The cross-section in the width direction is flat such as an ellipse or a rectangle, and all or part of the bottom portion thereof is flat and pointed downwardly like a triangle, a substantially triangle, a heart shape or a substantially heart shape. A pipe having a rounded pointed sharp groove for small amount drainage, and a fitting groove on its upper surface that fits into a small amount drainage groove of another horizontal drainage pipe,
A drainage pipe for horizontal drawing characterized by being composed of 3. A drain pipe holding means for fitting to a bottom portion of a horizontal drain pipe described below and holding the horizontal drain pipe at an appropriate height, and a drain pipe holding means fitted to the drain pipe holding means. A horizontal drainage pipe comprising a drainage pipe holding means fixing means for holding the drainage pipe at an appropriate height. The above horizontal drainage pipe has a flat cross section in the width direction, such as an ellipse or a rectangle, and all or part of the bottom portion thereof is a triangle, a substantially triangle, a heart shape, or a substantially heart shape, and faces downward. It consists of a pipe having a flat small point or a rounded pointed small point drainage groove. 4. A horizontal drainage pipe joint port which is closely fitted to one end of the horizontal drainage pipe pipe described below, and which extends vertically from the other part of the horizontal drainage pipe pipe joint, A flat drainage pipe joint which is flat in the width direction of the flat drainage pipe and which is closely fitted to one end of the flat vertical drainage pipe. The above horizontal drainage pipe has a flat cross section in the width direction, such as an ellipse or a rectangle, and all or part of the bottom portion thereof is a triangle, a substantially triangle, a heart shape, or a substantially heart shape, and faces downward. It consists of a pipe having a flat small point or a rounded pointed small point drainage groove.