Drainage pipe cover and rainwater drainage structure

Abstract

To provide a drainage pipe cover which can be used in a rainwater drainage structure for draining rainwater using a plurality of adjacent downpipes, can improve the fit in a connection structure between the plurality of downpipes and drainage pipes buried underground, and can improve drainage performance.SOLUTION: A drainage pipe cover 10 connects a plurality of downpipes 2 to a drainage pipe. The drainage pipe cover has: a downpipe storage portion connected to the plurality of downpipes while storing lower ends of the downpipes; and a drainage pipe storage portion having an outer cover connected to the lower end of the downpipe storage section and connected to a rising portion of the drainage pipe while storing the rising portion. The downpipe storage portion has a plurality of partial cylindrical surface portions that can be fitted to the plurality of downpipes. The drainage pipe storage portion has: a post-confluence drainage portion having a flow path cross-sectional area equal to or greater than the sum of the areas of inner parts of a circle formed including an arc-shaped inner periphery of the plurality of partial cylindrical surface portions; and a tapered surface that inclines downward from the inner periphery of the connection portion with the downpipe storage portion toward the post-confluence drainage portion.SELECTED DRAWING: Figure 11

Description

Technical Field

[0001] The present disclosure relates to a drain pipe cover and a rainwater drainage structure for connecting a vertical pipe and a drain pipe buried in the ground.

Background Art

[0002] Conventionally, rainwater flowing down from an eaves gutter attached to the eaves of a building roof is collected and sent to a vertical pipe, and is discharged from the lower side through the vertical pipe. Also, rainwater falling on the upper part of the building is discharged from the lower side through a water intake and a vertical pipe.

[0003] Patent Document 1 describes a drainage device for the lower end portions of a pair of vertical pipes that are connected in proximity to an eaves gutter and extend parallel to each other, in which a connecting cylinder having a ladle shape with a cross section formed by joining two circles so that a part thereof overlaps is provided, and the lower ends of the pair of vertical pipes are fitted and fixed to the upper end of the connecting cylinder. At the lower end portion of the connecting cylinder, an obliquely downward portion having a connecting portion of a pair of drain pipes is provided so as to be bent obliquely downward.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] By the way, in order to improve the appearance of a building such as a house, or due to circumstances such as piping installation, it may be considered to install a plurality of vertical pipes in proximity at a short distance. However, in this case, conventionally, there is no dedicated member corresponding to the connection portion between a plurality of pipes and a drain pipe buried in the ground, so there is a possibility that the parts may be connected in a non-harmonious state, resulting in poor fit. Also, depending on the way of connecting a plurality of pipes and the drain pipe, the flow path cross-sectional area of the connection portion may become small, and there is a possibility that the drainage capacity may be insufficient.

[0006] Since the drainage device described in Patent Document 1 has a structure connected to a pair of drain pipes, when it is connected to one drain pipe buried underground and the other connection part is blocked, the cross-sectional area of the connection part with the drain pipe becomes small, and there is a possibility that the drainage capacity is insufficient.

[0007] Therefore, an object of the present disclosure is to provide a drain pipe cover and a rainwater drainage structure that can be used for a rainwater drainage structure that drains rainwater using a plurality of adjacent downspouts, can improve the fit in the connection structure between the plurality of downspouts and the drain pipe buried underground, and can improve the drainage performance.

Means for Solving the Problems

[0008] The drain pipe cover according to the present disclosure is a drain pipe cover that connects a plurality of downspouts and a drain pipe buried underground, and includes a downspout storage part that is connected to the plurality of downspouts in a state where the lower ends of the plurality of downspouts are stored, and an outer cover connected to the lower end of the downspout storage part. The drain pipe cover has a drain pipe storage part connected to the rising part in a state where the rising part of the drain pipe is stored inside the outer cover. The downspout storage part has a plurality of partial cylindrical surfaces that can be fitted to the plurality of downspouts. The drain pipe storage part has a confluent drainage part having a flow path cross-sectional area equal to or greater than the sum of the areas of the inner parts of the circles formed including the arc-shaped inner peripheral edges of the plurality of partial cylindrical surfaces, and a tapered surface that slopes downward from the inner peripheral edge of the connection part between the downspout storage part and the confluent drainage part toward the confluent drainage part.

[0009] The rainwater drainage structure according to the present disclosure is a rainwater drainage structure including an eaves gutter, a plurality of vertical gutters connected to the eaves gutter, a drain pipe buried underground, and a drain pipe cover connecting the plurality of vertical gutters and the drain pipe. The drain pipe cover has a vertical gutter storage part connected to the plurality of vertical gutters while storing the lower ends of the plurality of vertical gutters, and an outer cover connected to the lower end of the vertical gutter storage part. The drain pipe cover has a drain pipe storage part connected to the rising part while storing the rising part of the drain pipe inside the outer cover. The drain pipe storage part has a post-merge drainage part having a flow path cross-sectional area equal to or greater than the total of the flow path cross-sectional areas of the portions of the plurality of vertical gutters stored in the drain pipe storage part, and a tapered surface inclined downward from the inner peripheral edge of the connection part between the vertical gutter storage part and the post-merge drainage part toward the post-merge drainage part.

Advantages of the Invention

[0010] According to the drain pipe cover and the rainwater drainage structure of one aspect of the present disclosure, the fit in the connection structure between the plurality of vertical gutters and the drain pipe can be improved. In addition, the drainage capacity of the plurality of vertical gutters before the rainwater merges can be maintained even in the post-merge drainage part after the rainwater merges. Furthermore, since a tapered surface can be opposed to the lower end opening of each vertical gutter, unlike a configuration in which a stepped surface orthogonal to the vertical direction is opposed to a position facing the lower end opening of each vertical gutter, the occurrence of backflow of rainwater can be suppressed. Therefore, the drainage property of rainwater can be enhanced.

Brief Description of the Drawings

[0011]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Embodiments for Carrying Out the Invention

[0012] Hereinafter, embodiments of the drain pipe cover and the rainwater drainage structure according to the present disclosure will be described with reference to the drawings. The shapes, arrangements, numbers, materials, etc. described below are examples for explanation, and can be appropriately changed according to the specifications of the drain pipe cover or the rainwater drainage structure. In the following, the same reference numerals will be given to equivalent elements in all the drawings for explanation.

[0013] Embodiments will be described with reference to FIGS. 1 to 11. FIG. 1 is a perspective view showing a part of a building 100 in which a rainwater drainage structure 1 including a drain pipe cover 10 of the embodiment is installed. In the building 100 where the rainwater drainage structure 1 is provided, an eaves gutter 104 is attached to the eaves edge of the roof 103. The eaves gutter 104 has a cross-sectional groove shape in which the lower ends of the front wall 105 and the rear wall 106 divided in the front-rear direction are connected by a bottom plate 107 and extends in the left-right direction. Note that the "left-right direction" means the left-right direction when viewed from the front side facing the outer wall surface 101 to which the vertical downspout 2 described later is attached in this specification. Also, the front side is the front side, the rear side is the outer wall surface 101 side, and the direction connecting the front side and the outer wall surface side is the front-rear direction.

[0014] The eaves gutter 104 is suspended and supported by a hanger (not shown) attached to the building 100, for example, and is attached to the eaves of the roof 103 and arranged to receive rainwater flowing down from the roof. The eaves gutter 104 has an open top surface and its left and right ends are closed. Drain holes (not shown) are formed at two positions in the lateral direction close to the middle of the bottom plate 107 of the eaves gutter 104. The upper vertical gutter 109 is connected to each drain hole via a drain 108. At the lower end of the vertical gutter 109, the lower vertical gutter 2 extending vertically near the outer wall surface 101 of the building 100 is connected via a first elbow 110, a downspout 111, and a second elbow 112. Further, a plurality of positions in the vertical direction of each vertical gutter 2 are fixed to the outer wall surface 101 via a plurality of vertical gutter holders 5. Each vertical gutter 2 discharges rainwater downward. At this time, the lower end of each vertical gutter 2 is connected to a drainage pit (not shown) via a drain pipe cover 5, a drain pipe 70 buried in the ground, and an elbow 73 (FIG. 2).

[0015] A pipe connected to a sewer pipe is connected to the drainage pit. The rainwater drainage structure 1 is composed of the eaves gutter 104, two drains 108, vertical gutters 109, a first elbow 110, a downspout 111, a second elbow 112, and vertical gutters 2, a plurality of vertical gutter holders 5, a drain pipe cover 10, and a drain pipe 70. Thereby, a plurality of vertical gutters 109 are connected to the eaves gutter 104. In the rainwater drainage structure 1, the rainwater in the eaves gutter 104 is sent to the drain pipe cover 10 via the drains 108, vertical gutters 109, first elbow 110, downspout 111, second elbow 112, and vertical gutters 2, and is sent from the drain pipe cover 10 to the drainage pit via the drain pipe 70.

[0016] In this example, a plurality of positions in the vertical direction of the two vertical gutters 2 are fixed to the outer wall surface 101 of the building 100 via the vertical gutter holders 5. Also, the lower ends of the two vertical gutters 2 are connected to the drain pipe 70 by the drain pipe cover 10. Hereinafter, the configuration of the drain pipe cover 10 will be mainly described.

[0017] FIG. 2 is a perspective view showing a part of a connection structure 120 that connects two vertical pipes 2 including part A of FIG. 1 and a drain pipe 70. FIG. 3 is a view of the connection structure 120 seen from above. FIG. 4 is an exploded perspective view of the connection structure 120. FIG. 5 is a sectional view taken along line B-B of FIG. 3. FIG. 6 is a sectional view taken along line C-C of FIG. 3. Here, up and down mean up and down in a state where the vertical pipe 2 is fixed to the outer wall surface 101.

[0018] As shown in FIGS. 2 to 6, the connection structure 120 includes two vertical pipes 2 extending in the vertical direction, a drain pipe 70 extending in the vertical direction while being buried in the ground, and a drain pipe cover 10. As shown in FIG. 3, each vertical pipe 2 has two vertical pipe claw portions 3 and 4 provided on the rear side with a lateral separation and extending in the vertical direction. Each of the vertical pipe claw portions 3 and 4 projects in the front-rear direction from two positions on the left and right of the rear side surface of the vertical pipe 2, and is bent at a substantially right angle so as to be separated from each other at the rear end and has a tapered shape.

[0019] The drain pipe 70 has a cylindrical tube portion 71 and a flange portion 72 having a rectangular cross-section and formed to project radially outward on the outer peripheral surface of the upper end portion of the tube portion 71.

[0020] The drain pipe cover 10 connects the lower end portions of the two vertical pipes 2 and the rising portion 71a which is the upper end portion of the drain pipe 70. The rising portion 71a projects above the ground. The drain pipe cover 10 is arranged on the ground with only the subsequent confluent drainage portion 30 (FIG. 5) entering the lower side of the ground. In FIGS. 2, 5, and 6, the ground is indicated by a two-dot chain line GL.

[0021] As shown in FIG. 2, an elbow 73 is connected to the downstream end of the drain pipe 70. A drain pan (not shown) is connected to the downstream end of the elbow 73. When a drain pan is connected directly below the drain pipe 70, the drain pan may be directly connected to the downstream end of the drain pipe 70 without passing through the elbow.

[0022] FIG. 7 is a perspective view showing the connection portion 122 between the two vertical drain pipes 2 and the drain pipe cover 10 taken out from FIG. 2. FIG. 8 is a view of the connection portion 122 seen from above. FIG. 9 is a view showing the state where the vertical drain pipe 2 is removed from the connection portion 122 in FIG. 8. FIG. 10 is a view of the connection portion 122 seen from below. FIG. 11 is a perspective view showing the D-D cross section of FIG. 8 at the connection portion 122.

[0023] As shown in FIGS. 7 to 11, the drain pipe cover 10 includes a vertical drain pipe housing portion 11 extending in the vertical direction, an outer cover 14 connected to the lower end of the vertical drain pipe housing portion 11, and a drain pipe housing portion 20 connected to the rising portion 71a of the drain pipe 70 in a state where the rising portion 71a of the drain pipe 70 is housed inside the outer cover 14. Further, the drain pipe housing portion 20 has an inclined cylindrical portion 21 connected to the middle portion in the front-rear direction and extending obliquely downward on the lower surface of a later-described top plate portion 16 of the outer cover 14, and a post-merge drainage portion 30 connected to the lower end of the inclined cylindrical portion 21. The drain pipe cover 10 is integrally formed of resin. Note that the drain pipe cover 10 may be formed by casting or the like of a metal such as iron or stainless steel.

[0024] The vertical drain pipe housing portion 11 has a cylindrical shape in which two cylinders are connected so as to partially overlap a rectangular cylinder so as to project outward in the left-right direction and forward on the front sides of both left and right sides of a rectangular cylinder having a rectangular cross section orthogonal to the vertical direction. As a result, two partial cylindrical surface portions 12 into which the vertical drain pipes 2 can be respectively fitted inside are provided in the vertical drain pipe housing portion 11 so as to be separated in the left-right direction. As shown in FIG. 8, each partial cylindrical surface portion 12 can fit the vertical drain pipe 2 inside and is formed by a part of the circumferential direction of the cylinder. The partial cylindrical surface portion 12 can have a central angle of 180 degrees or more.

[0025] With the vertical drainpipes 2 fitted into the cylindrical surface portions 12 of each part, the two vertical drainpipe claw portions 3 and 4 of the vertical drainpipes 2 are inserted into the portion forming the rectangular cross-section space at the rear side of the vertical drainpipe storage portion 11. In this state, the vertical drainpipes 2 are slidable in the vertical direction with respect to the cylindrical surface portions 12 of each part. For this reason, the vertical drainpipe storage portion 11 is connected to each of the two vertical drainpipes 2 in a state of storing the two vertical drainpipes 2, allowing the vertical movement of the two vertical drainpipes 2. Therefore, in a state where the vertical drainpipes 2 are connected to the vertical drainpipe storage portion 11, the drainpipe cover 10 allows the vertical expansion and contraction of the vertical drainpipes 2 due to temperature changes, so that the durability of the drainpipe cover 10 can be increased.

[0026] Also, the outer cover 14 has an outer cylindrical portion 15 with a cross-sectional shape in which the four corners of the rectangle are chamfered into arcs, and a top plate portion 16 closing the upper end of the outer cylindrical portion 15. A horizontally long hole having the same shape as the inner peripheral shape of the vertical drainpipe storage portion 11 is formed in the middle portion in the front-rear direction of the top plate portion 16, and the lower end of the vertical drainpipe storage portion 11 is connected to the peripheral edge of the hole.

[0027] The inclined cylindrical portion 21 has a long hole shape in which the cross-section orthogonal to the axial direction is long in the left-right direction, and is a cylindrical shape inclined so that the widths in the left-right direction and the front-rear direction become smaller toward the lower end. Thereby, a tapered surface 22 inclined downward from the upper end toward the central portion is formed on the inner surface of the inclined cylindrical portion 21.

[0028] The combined drainage portion 30 after confluence is connected to the lower end of the inclined cylindrical portion 21, and has a cylindrical shape with a long hole shape in which the cross-sectional shape orthogonal to the axial direction is an ellipse long in the left-right direction.

[0029] Thereby, the above-mentioned tapered surface 22 is inclined downward from the inner peripheral edge of the connection portion with the vertical drainpipe storage portion 11 at the upper end toward the combined drainage portion 30 after confluence.

[0030] Furthermore, as shown in Fig. 9, the post - confluence drainage section 30 has a flow - path cross - sectional area of a cross - section orthogonal to the axial direction, which is equal to or larger than the sum (S1 + S2) of the areas S1 and S2 of the inner part of the circle (the circle including the two - dot chain lines G1 and G2) formed by including the arcuate inner peripheral edges of the two partial cylindrical surfaces 12. Also, the flow - path cross - sectional area of the post - confluence drainage section 30 may be configured to be at least twice the sum (S1 + S2) of the areas S1 and S2 of the inner part of the circle for the two partial cylindrical surfaces 12.

[0031] Furthermore, in the rainwater drainage structure 1 of this example, the post - confluence drainage section 30 has a flow - path cross - sectional area that is equal to or larger than the sum (Sa + Sb) of the flow - path cross - sectional areas (Sa and Sb in the sandy area of Fig. 8) of the portions of the two vertical downspouts 2 that are housed in the drain - pipe housing section 20 in the axial - direction - orthogonal direction. Also, the flow - path cross - sectional area of the post - confluence drainage section 30 may be configured to be at least twice the sum (Sa + Sb) of the flow - path cross - sectional areas Sa and Sb of the two vertical downspouts 2.

[0032] As shown in Figs. 5 and 6, the above - mentioned drain - pipe cover 10 is connected in a state where the two vertical downspouts 2 are housed in the vertical - downspout housing section 11 and in a state where the rising portion 71a of the drain pipe 70 is housed in the drain - pipe housing section 20. At this time, the post - confluence drainage section 30 of the drain - pipe housing section 20 is inserted inside the rising portion 71a of the drain pipe 70, and the connecting portion between the outer peripheral surface of the post - confluence drainage section 30 and the outer peripheral surface of the inclined cylinder portion 21 abuts against the upper end of the rising portion 71a. Thereby, the drain - pipe cover 10 is positioned with respect to the drain pipe 70.

[0033] According to the above-mentioned drain pipe cover 10, since the two vertical pipes 2 and the drain pipe 70 can be connected in a harmonious state by the integral drain pipe cover 10, the fit in the connection structure 120 between the two vertical pipes 2 and the drain pipe 70 can be improved. Also, the drainage capacity of the two vertical pipes 2 before the confluence of rainwater can be maintained even at the post-confluence drainage part 30 after the confluence of rainwater. Furthermore, since a tapered surface can be made to face the lower end opening of each vertical pipe 2, unlike the configuration where a stepped surface orthogonal to the vertical direction faces the position facing the lower end opening of each vertical pipe 2, the occurrence of backflow of rainwater can be suppressed. Therefore, the drainage performance of rainwater can be enhanced. Also, since the rising part 71a of the drain pipe 70 is accommodated by the outer cover 14, even when the amount of rainwater drained into the drain pipe 70 is large, spillage from the upper end of the drain pipe 70 can be suppressed.

[0034] Also, in this example, since the cross-section of the post-confluence drainage part 30 orthogonal to the axial direction is in the shape of a long hole, unlike the case where the cross-section of the post-confluence drainage part is circular, even with the same flow path cross-sectional area, the left-right direction length D1 (Fig. 9) when looking at the tapered surface 22 for rainwater confluence from above can be reduced. Thereby, the inclination angle of the tapered surface 22 with respect to the vertical direction can be decreased. For this reason, even when the flow of rainwater flowing downward through the drain pipe cover 10 is strong, the amount of rainwater rebounding upward at the tapered surface 22 can be reduced, so that spillage of rainwater from the upper side of the drain pipe cover 10 can be prevented.

[0035] Note that in the above-described embodiment, the case where the flow path cross-sectional area of the post-confluence drainage part 30 is equal to or greater than the sum (S1 + S2) of the areas S1, S2 of the inner part of the circle formed including the circular arc-shaped inner peripheral edges of the two partial cylindrical surfaces 12 of the vertical pipe housing part 11, and is also equal to or greater than the sum (Sa + Sb) of the flow path cross-sectional areas Sa, Sb orthogonal to the axial direction of the part of the two vertical pipes 2 housed in the drain pipe housing part 20 has been described.

[0036] On the other hand, in another example of the rainwater drainage structure, the cross-sectional area of the drainage part after confluence is less than the sum (S1 + S2) of the areas of the inner parts S1 and S2 of the circles for the two partial cylindrical surfaces. However, among the two vertical pipes 2, it may be configured such that the sum (Sa + Sb) of the cross-sectional areas Sa and Sb orthogonal to the axial direction of the part housed in the drain pipe housing part 20 is greater than or equal to the sum (S1 + S2). In this case, while ensuring the necessary drainage performance of the drain pipe cover 10, it becomes easier to reduce the outer diameter of the drainage part after confluence.

[0037] Also, in the above description, the case where the drain pipe cover 10 connects the two vertical pipes 2 and the drain pipe 70 has been described. On the other hand, by configuring the vertical pipe housing part 11 of the drain pipe cover 10 to have three or more partial cylindrical surfaces, the drain pipe cover 10 may be configured to connect three or more vertical pipes 2 and the drain pipe 70. For this reason, the rainwater drainage structure can also be configured to include three or more vertical pipes connected to the eaves gutter and a drain pipe cover that connects the three or more vertical pipes and the drain pipe.

[0038] The present disclosure will be further described by the following embodiments. Configuration 1: A drain pipe cover that connects a plurality of vertical pipes and a drain pipe buried underground, having a vertical pipe housing part connected to the plurality of vertical pipes in a state of housing the lower end parts of the plurality of vertical pipes, and an outer cover connected to the lower end of the vertical pipe housing part. The drain pipe housing part for connecting to the rising part of the drain pipe is provided inside the outer cover in a state of housing the rising part of the drain pipe. The vertical pipe housing part has a plurality of partial cylindrical surfaces that can be fitted to the plurality of vertical pipes. The drain pipe housing part has a post-confluence drainage part having a cross-sectional area equal to or greater than the sum of the areas of the inner parts of the circles formed including the circular arc-shaped inner peripheral edges of the plurality of partial cylindrical surfaces, and a tapered surface that slopes downward from the inner peripheral edge of the connection part between the vertical pipe housing part and the post-confluence drainage part toward the post-confluence drainage part. Drain pipe cover. Configuration 2: The post-confluence drainage part has a long hole shape in a cross-section orthogonal to the axial direction. The drain pipe cover according to Configuration 1. Configuration 3: The plurality of vertical gutters are connected to the vertical gutter storage portion so as to enable vertical movement of the plurality of vertical gutters. The drain pipe cover according to Configuration 1 or Configuration 2. Configuration 4: A rainwater drainage structure including an eaves gutter, a plurality of vertical gutters connected to the eaves gutter, a drain pipe buried in the ground, and a drain pipe cover connecting the plurality of vertical gutters and the drain pipe, The drain pipe cover, has a vertical gutter storage portion connected to the plurality of vertical gutters in a state of storing the lower ends of the plurality of vertical gutters, and an outer cover connected to the lower end of the vertical gutter storage portion. The drain pipe storage portion is connected to the rising portion of the drain pipe in a state of storing the rising portion of the drain pipe inside the outer cover. The drain pipe storage portion has a post - merger drainage portion having a flow path cross - sectional area equal to or larger than the total flow path cross - sectional area of the portions of the plurality of vertical gutters stored in the drain pipe storage portion, and a tapered surface that slopes downward from the inner peripheral edge of the connection portion between the vertical gutter storage portion to the post - merger drainage portion. Rainwater drainage structure.

Explanation of Signs

[0039] 1 Rainwater drainage structure, 2 Vertical gutter, 5 Vertical gutter control tool, 10 Drain pipe cover, 11 Vertical gutter storage portion, 12 Cylindrical surface portion, 14 Outer cover, 15 Outer cylindrical portion, 16 Top plate portion, 20 Drain pipe storage portion, 21 Inclined cylindrical portion, 22 Tapered surface, 70 Drain pipe, 71 Cylindrical portion, 71a Rising portion, 72 Flange portion, 73 Elbow, 100 Building, 101 Outer wall surface, 103 Roof, 104 Eaves gutter, 105 Front wall, 106 Rear wall, 107 Bottom plate, 108 Drain, 109 Vertical gutter, 110 First elbow, 111 Call gutter, 112 Second elbow, 120 Connection structure, 122 Connection portion.

Claims

1. A drain pipe cover that connects a plurality of vertical pipes and a drain pipe buried underground, having a vertical pipe storage portion connected to the plurality of vertical pipes in a state where the lower ends of the plurality of vertical pipes are stored, and an outer cover connected to the lower end of the vertical pipe storage portion, and having a drain pipe storage portion connected to the rising portion in a state where the rising portion of the drain pipe is stored inside the outer cover, the vertical pipe storage portion having a plurality of partial cylindrical surfaces that can be fitted to the plurality of vertical pipes, the drain pipe storage portion having a confluent drainage portion having a flow path cross-sectional area equal to or greater than the sum of the areas of the inner portions of the circles formed including the arcuate inner peripheral edges of the plurality of partial cylindrical surfaces, and a tapered surface inclined downward from the inner peripheral edge of the connection portion between the vertical pipe storage portion toward the confluent drainage portion, a drain pipe cover.

2. The confluent drainage portion has a long hole shape in a cross section orthogonal to the axial direction, The drain pipe cover according to claim 1.

3. The plurality of vertical pipes are connected to the vertical pipe storage portion so as to be movable in the vertical direction of the plurality of vertical pipes, The drain pipe cover according to claim 1.

4. A rainwater drainage structure including an eaves gutter, a plurality of vertical pipes connected to the eaves gutter, a drain pipe buried underground, and a drain pipe cover that connects the plurality of vertical pipes and the drain pipe, wherein the drain pipe cover has a vertical pipe storage portion connected to the plurality of vertical pipes in a state where the lower ends of the plurality of vertical pipes are stored, and an outer cover connected to the lower end of the vertical pipe storage portion, and having a drain pipe storage portion connected to the rising portion in a state where the rising portion of the drain pipe is stored inside the outer cover, the drain pipe storage portion having a confluent drainage portion having a flow path cross-sectional area equal to or greater than the sum of the flow path cross-sectional areas of the portions of the plurality of vertical pipes stored in the drain pipe storage portion, and a tapered surface inclined downward from the inner peripheral edge of the connection portion between the vertical pipe storage portion toward the confluent drainage portion, a rainwater drainage structure.

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