Overflow water draining route structure

Abstract

To provide an overflow water draining route structure including an overflow joint which can be compactly designed without impairing the appearance around a down-pipe, which can greatly reduce the number of components while hardly causing construction labors, construction errors or failures, and in addition which stably and properly drains overflow water even if a down-pipe line is closed.SOLUTION: The overflow water draining route structure includes the overflow joint connected to the down-pipe cylinder having a pipeline. Inside the pipeline, it has an upward water channel for guiding overflow water flowing from the lower end side to the upper side, an outward water channel provided continuously with the upward water channel so as to guide the overflow water to the outside of the pipeline, and a downward water channel provided continuously with the outward water channel so as to guide the overflow water to the lower side. On the upper end side of the upward water channel, a first inclined surface is provided extending to the radial outside of the pipeline as advancing upward.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an overflow water drainage channel structure including a fitting that can be connected to a downspout of a rain gutter to drain overflow water. [Background technology]

[0002] If a foreign object gets into the downspout pipe and the flow becomes poor, or if a large amount of rainwater flows in and exceeds the drainage capacity, water may accumulate inside the downspout pipe, preventing it from flowing down and causing it to overflow from the top. For example, if the downspout is used to drain rainwater that falls on a balcony, there is a risk that the water may accumulate inside the balcony, causing water to seep into the room through a window next to the balcony or leak into the eaves.

[0003] Regarding overflow fittings, Patent Document 1 (JP 2016-125248 A) discloses an overflow fitting including a cylindrical upper connection part that connects to an upper downspout of a downspout divided into an upper downspout and a lower downspout, and a cylindrical lower connection part that is provided below the upper connection part and connects to the lower downspout. In this overflow fitting, the lower connection part has a cylindrical peripheral wall part, and the upper connection part has a cylindrical cover part that covers the peripheral wall part. The peripheral wall part and the cover part form an inlet flow path that guides rainwater to the outside of a normal flow pipe that connects the upper downspout pipe and the lower downspout pipe, and a discharge flow path that allows the rainwater to flow downward, and the inlet flow path and the discharge flow path are adjacent to each other on the same circumference. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-125248 Summary of the Invention [Problem to be solved by the invention]

[0005] In the overflow fitting disclosed in Patent Document 1, the inlet and outlet flow paths are located outside the downspout pipe, so when the fitting is attached to the downspout, the fitting components protrude significantly from the outer periphery of the downspout. Furthermore, in order to ensure the overflow drainage capacity with the above configuration, it is necessary to increase the portion of the downspout that protrudes from the outer periphery. This joint has a peripheral wall portion inside the component that runs along the inner surface of the downspout pipe, and because the inlet path and outlet path are adjacent to each other on the same circumference, it is necessarily made up of multiple components, which requires a lot of assembly work.

[0006] Therefore, the present invention aims to provide an overflow joint that can be designed compactly, does not spoil the aesthetic appearance around the downspout, can significantly reduce the number of parts, is less labor-intensive to install, and is less likely to result in installation errors or defects, and further, is capable of stably and appropriately discharging overflow wastewater even if the downspout pipe is clogged. [Means for solving the problem]

[0007] In order to solve the above problems, the overflow water drainage channel structure according to the present invention comprises: an overflow joint connected to a downspout having a pipe; an upward water channel inside the pipe that guides overflow water flowing in from the lower end side upward; an outward conduit provided continuously with the upward conduit and directing the overflow water to the outside of the pipeline; a downward water conduit provided continuously with the outward water conduit and directing the overflow water downward; and A first inclined surface (outward inclined surface) extending radially outward of the pipeline as it goes upward is provided on the upper end side of the upward water conduit; It is characterized by:

[0008] The overflow water drainage channel structure of the present invention, having such a configuration, can be made compact with a simple structure and the number of parts can be reduced. Furthermore, even if the cross-sectional area of ​​the upward water channel is small, backflow and stagnation of overflow water can be prevented, and the overflow water can be discharged smoothly and stably. As a result, the external dimensions of the joints can be kept small, so the aesthetic appearance is not impaired.

[0009] In addition, in the overflow water drainage channel structure of the present invention, it is preferable that a second inclined surface (downward inclined surface) is provided on the upper end side of the outward water channel, extending radially outward of the pipeline as it goes downward.

[0010] With the overflow water drainage channel structure having such a configuration, it is possible to discharge the overflow water more smoothly.

[0011] In addition, in the overflow water drainage channel structure of the present invention, it is preferable that the upward water conduit, the outward water conduit and the downward water conduit are formed by connecting the overflow joint to the downspout pipe.

[0012] With an overflow water drainage channel structure having such a configuration, it can be easily attached to a downspout pipe. [Effects of the Invention]

[0013] According to the present invention, a simple and compact structure can be achieved, and the number of parts can be reduced. Furthermore, even if the cross-sectional area of ​​the upward water channel is small, backflow and stagnation of overflow water can be prevented, and overflow water can be discharged smoothly and stably. As a result, the external dimensions of the joint can be kept small, and the aesthetic appearance is not impaired. [Brief explanation of the drawings]

[0014] [Figure 1] 1A to 1C are a front view, a bottom view, a cross-sectional view along line AA, a cross-sectional view along line BB, and an enlarged view of part C showing an overflow water drainage channel structure 1 according to one embodiment of the present invention. [Figure 2] 1A to 1C are a front view, a side view, a rear view, a top view, a bottom view, an upper perspective view, and a lower perspective view showing an outline of an overflow joint 3. [Figure 3] 2A and 2B are a cross-sectional view of the overflow joint 3 taken along line DD, a cross-sectional view of line EE, an enlarged view of part F, and a view showing an inclined surface. [Figure 4] 10A and 10B are bottom views of overflow joints 103, 203, 303, and 403 according to first to fourth modifications of the present embodiment. [Figure 5] 10 is a cross-sectional view showing overflow water drainage channel structures 13A to 13D according to comparative examples 1 and 2 and examples 1 and 2. FIG. [Figure 6] FIG. 1 is a schematic diagram of a test device 9 used in Comparative Examples 1 and 2 and Examples 1 and 2. DETAILED DESCRIPTION OF THE INVENTION

[0015] An embodiment of an overflow water drainage channel structure and an overflow joint according to the present invention will be described in detail below with reference to the drawings. However, the present invention is not limited to those shown in the drawings. Furthermore, since the drawings are intended to conceptually explain the present invention, the proportions and quantities of parts may be exaggerated or simplified as necessary to facilitate understanding. In the following description, the same or equivalent parts will be designated by the same reference numerals, and duplicate explanations may be omitted.

[0016] 1. Overflow water drainage channel structure As shown in Figure 1, the overflow water drainage channel structure 1 of this embodiment includes an overflow joint 3 connected to a downspout pipe 5 having a pipe 51. Alternatively, it can be said that the overflow joint 3 is interposed between the upper and lower downspout pipes 5, and the overflow water drainage channel structure 1 is formed by attaching the lower downspout pipe 5 in particular to the overflow joint 3.

[0017] The overflow water drainage channel structure 1 has an upward water conduit 71, an outward water conduit 72, and a downward water conduit 73. In this specification, these paths are collectively referred to as the overflow drainage path 7, and the wastewater discharged through the overflow drainage path 7 is referred to as overflow drainage. The limit amount of overflow drainage that can be discharged through the overflow drainage path 7 is referred to as the overflow drainage capacity. In contrast, the path from the upper downspout 5 to the lower downspout 5 at the overflow fitting 3 is referred to as the normal drainage channel 8, and the wastewater discharged through the normal drainage channel 8 is referred to as normal drainage.

[0018] First, the normal drainage channel 8 will be described. The normal drainage channel 8 is a channel for discharging normal wastewater in a substantially vertically downward direction as shown by the arrow. The normal drainage channel 8 is formed inside the overflow drainage channel 7. The opening cross-sectional area of ​​the normal drainage channel 8 preferably occupies 20% or more of the opening cross-sectional area of ​​the downspout pipe 5, and more preferably 50% or more.

[0019] Next, the overflow drainage path 7 will be described. The overflow drainage path 7 is mainly composed of an upward water conduit 71, an outward water conduit 72, a downward water conduit 73, an inlet 74, and an outlet 75. The upward water conduit 71 is provided inside the pipe 51 and serves to guide the overflow water that has flowed in from the lower end side upward (see FIGS. 1(C) and (F)).

[0020] The upward water conduit 71 is formed between the lower downspout pipe 5 and the overflow joint 3. Alternatively, it can be said that the upward water conduit 71 is arranged outside the normal drainage channel 8 and inside the lower downspout pipe 5. In the illustrated example, the upward water conduit 71 is arranged on the opposite side of the normal drainage channel 8, but the arrangement is not limited to this. The opening cross-sectional area of ​​the upward water channel 71 is preferably 20% or more of the opening cross-sectional area of ​​the downspout pipe 5, and more preferably 50% or more.

[0021] The upward water conduit 71 has an inlet 74 at its lower end. The inlet 74 is an inlet through which overflow water flows and faces downward. The opening cross-sectional area of ​​the inlet 74 is preferably approximately equal to the opening cross-sectional area of ​​the upward water channel 71. In other words, the opening cross-sectional area of ​​the inlet 74 is preferably 20% or more of the opening cross-sectional area of ​​the downspout pipe 5, and more preferably 50% or more.

[0022] An outwardly inclined surface 34 (corresponding to a first inclined surface) is provided on the upper end side of the upward water conduit 71 (see, for example, FIG. 1(E)). The outwardly inclined surface 34 extends radially outward of the pipe 51 as it extends upward. Therefore, the outwardly inclined surface 34 serves to change the upward flow of overflow water into an outward flow. The inclination angle α (see FIG. 1(E)) of the outward inclined surface 34 is preferably 45±15°, more preferably 45±5°, relative to the incidence of the overflow water (for example, substantially vertically upward).

[0023] The outward water conduit 72 is provided continuous with the upward water conduit 71 and guides overflow water to the outside of the pipe 51. That is, the outward water conduit 72 is located on the upper end side of the upward water conduit 71 and guides the overflow water that has come up the upward water conduit 71 to the outside of the pipe. The opening cross-sectional area of ​​the outward water channel 72 is preferably 20% or more of the opening cross-sectional area of ​​the downspout pipe 5, and more preferably 50% or more.

[0024] A downwardly inclined surface 35 (corresponding to the second inclined surface) is provided on the upper end side of the outward water conduit 72 (see FIG. 1(C)). The downwardly inclined surface 35 extends radially outward of the pipe 51 as it extends downward. Therefore, the downwardly inclined surface 35 serves to change the outward flow of overflow water into a downward flow. The opening cross-sectional area of ​​the downward water channel 73 is preferably 20% or more of the opening cross-sectional area of ​​the downspout pipe 5, and more preferably 50% or more.

[0025] The downward conduit 73 is provided continuous with the outward conduit 72 and guides overflow water downward. In other words, the downward conduit 73 is connected to the outside of the outward conduit 72 and guides downward the overflow water that has flowed outward through the outward conduit 72. Alternatively, it can be said that the downward conduit 73 is located outside the upward conduit 71 via the wall surface of the lower downspout pipe 5. The inclination angle β (see FIG. 1(E)) of the downward inclined surface 35 is preferably 45±15°, more preferably 45±5°, relative to the outflow direction of the overflow water (for example, substantially vertical).

[0026] A discharge port 75 is provided at the lower end side of the downward water conduit 73. The discharge port 75 discharges overflow water to the outside of the pipeline 51. It is preferable that the opening cross-sectional area of ​​the outlet 75 is approximately equal to the opening cross-sectional area of ​​the upward water channel 71. In other words, the ratio of the opening cross-sectional area of ​​the outlet 75 to the opening cross-sectional area of ​​the downspout pipe 5 is preferably 20% or more, and more preferably 50% or more.

[0027] Here, from the viewpoint of ensuring a sufficient drainage cross-sectional area of ​​the normal drainage channel 8 while making the water-conducting cross-sectional area of ​​the upward water conduit 71 and the downward water conduit 73 as large as possible, it is desirable that the opening shape of the normal drainage channel 8 be rectangular, but it may also be approximately circular or have another shape. Furthermore, considering the loss of water flow due to friction between the water and the waterway walls, it is desirable to secure a large overall cross-sectional area. In other words, it is desirable to reduce the area of ​​the waterway walls that come into contact with the overflow water. For this reason, it is particularly preferable that the normal drainage channel 8 is rectangular and that upward conduits 71 with large cross-sectional areas are formed in two opposing locations. Alternatively, one side of the downward conduit 73 may be eliminated or narrowed to prevent overflow drainage from a specific side.

[0028] 2. Overflow fitting Next, the single overflow joint 3 (simply referred to as joint) in this embodiment will be described in detail.

[0029] 3, the joint 3 includes an inner cylinder 31 and an outer cylinder 32, and is closed by forming a closed wall surface 33 that closes the upper part between the inner cylinder 31 and the outer cylinder 32. In other words, the joint 3 has a double structure of the inner cylinder 31 and the outer cylinder 32, and the inner cylinder 31 and the outer cylinder 32 are connected via the closed wall surface 33.

[0030] The closing wall surface 33 is preferably configured as an inclined surface. The inclined surface may include an outward inclined surface 34 (first inclined surface) that extends radially outward of the pipe 51 as it extends upward on the upper end side of the upward water conduit 71. The inclined surface may further include a downward inclined surface 35 (second inclined surface) that extends radially outward of the pipe 51 as it extends downward.

[0031] Between the outer surface of the inner cylinder 31 and the inner surface of the outer cylinder 32, an upward water channel planned area 71A, an outward water channel planned area 72A, and a downward water channel planned area 73A are formed in an open state (see Figure 3(D)). The wall of the downspout pipe 5 connected to the inner pipe 31 serves as a partition between the upward water channel planned area 71A and the downward water channel planned area 73A, forming the upward water channel 71 and the outward water channel 72, as well as forming the outward water channel 72, and further connecting the upward water channel 71, outward water channel 72 and downward water channel 73 (see Figure 1 (C)).

[0032] A part of the outer surface of the inner tube 31 forms a downspout pipe mounting portion 36 (fitting surface) (see Fig. 3(C) and Fig. 1(D)). The downspout pipe mounting portion 36 is the portion into which the upper end of the downspout pipe 5 fits.

[0033] The downspout pipe mounting portion 36 preferably has a downspout pipe abutment surface 37 against which the upper end of the downspout pipe 5 abuts, via a gap of a predetermined distance L between the closing wall surface 33 and the downspout pipe abutment surface 37. The downspout pipe abutment surface 37 functions as a stopper. The tubular wall of the downspout pipe 5, which serves as the partition between the upward water channel 71 area and the downward water channel 73, is attached at a predetermined distance L from the closed wall surface 33, ensuring an appropriate water flow cross-section of the outward water channel (see Figures 1(C) and (D)).

[0034] Above the joint 3, there is also a downspout pipe mounting portion 38 (see, for example, FIGS. 1(C), (D) and 3(B), (C)). The downspout pipe mounting portion 38 is a cylindrical member that covers the outer peripheral surface of the lower end of the upper downspout pipe 5 when fitted into the lower end of the upper downspout pipe 5.

[0035] The above-described configuration of the joint 3 simplifies the structure of the joint 3, makes the drainage path compact, reduces the bulkiness around the downspout, and maintains the aesthetic appearance.

[0036] 3. Function of overflow water drainage channel structure The operation of the overflow water drainage channel structure 1 of this embodiment will be described. In the overflow water drainage channel structure 1, water normally flows from the upper downspout pipe 5 through the overflow joint 3 to the lower downspout pipe 5 (normal drainage).

[0037] Unlike normal drainage, if the amount of water exceeds the drainage capacity of the normal drainage channel 8, or if drainage is obstructed for some reason, water will accumulate in the lower downspout 5. If water continues to accumulate in the lower downspout 5, it will eventually flow from the inlet 74 into the overflow drainage path 7. The water rises up the upward water conduit 71, passes through the outward water conduit 72, and descends the downward water conduit 73, and is discharged from the outlet 75.

[0038] 4. Variations With reference to FIGS. 4(A) to 4(D), overflow joints 103, 203, 303, and 304 according to first to fourth modifications of this embodiment will be described. 4(A) to 4(D), the diagonal lines on the outer periphery (diagonal lines sloping downward to the right) represent the positions of downwardly inclined surfaces 135, 235, 335, and 435 when overflow fittings 103, 203, 303, and 304 are viewed from below. The diagonal lines on the inner periphery (diagonal lines sloping upward to the right) represent the positions of outwardly inclined surfaces 134, 234, 334, and 434 when overflow fittings 103, 203, 303, and 304 are viewed from below.

[0039] As shown in Fig. 4(A), the joint 103 according to the first modification includes an inner cylinder 131 and an outer cylinder 132 each having a substantially rectangular cross section. The joint 103 also has an annular outward inclined surface 134 and a downward inclined surface 135. The outward water conduits 172 are formed at two locations on opposite sides of the normal drainage channel 8.

[0040] As shown in Fig. 4(B), the joint 203 according to the second modification includes an inner cylinder 231 having a substantially circular cross-sectional shape and an outer cylinder 232 having a substantially rectangular cross-sectional shape. The joint 203 also has an annular outward inclined surface 234 and a downward inclined surface 235. The outward water conduits 272 are formed at two locations on opposite sides of the normal drainage channel 8.

[0041] As shown in Fig. 4(C), the joint 303 according to the third modification includes an inner cylinder 331 having a substantially circular cross section and an outer cylinder 332 having a substantially rectangular cross section. The joint 303 also includes an outwardly inclined surface 334 divided into two, and an annularly formed downwardly inclined surface 335. The outward water conduits 372 are formed at two locations on opposite sides of the normal drainage channel 8.

[0042] As shown in Fig. 4(D), joint 403 according to modification 4 includes inner cylinder 431 and outer cylinder 432 each having a substantially rectangular cross section. Joint 403 also has outward inclined surface 434 located on opposite sides of normal drainage channel 8, and downward inclined surface 435 arranged in a substantially C- or U-shape. Outward water channels 472 are formed at two locations located on opposite sides of normal drainage channel 8.

[0043] Although the representative embodiments of the present invention have been described above, the present invention is not limited to these, and various design modifications are possible. It goes without saying that such modified forms (variations) of the design are also included in the technical scope of the present invention.

[0044] 5. Working Example In order to verify the drainage efficiency of the outwardly inclined surface and the downwardly inclined surface described above, overflow joints 13A to 13D according to comparative examples 1 and 2 and examples 1 and 2 were manufactured, and the overflow drainage capacity was measured.

[0045] For the measurement, a test model 9 shown in FIG. 6 was fabricated. The standard for drainage capacity is 15m 2 The target is to be able to continuously drain a rainfall intensity of 160 mm for a balcony area of ​​160 mm. Therefore, the amount of rainwater supplied to the test model 9 is 45 L / min, which is well above 40 L / min, and is supplied from the hose to the supply port 92.

[0046] The length of the eaves gutter 91 is set to at least a length that prevents the force of the water supplied from the hose from flowing directly into the eaves gutter outlet 93 of the funnel, and in this test model 9, the length from the supply port 92 to the eaves gutter outlet 93 is set to 2500 mm. The distance from the funnel to the other end of the eaves gutter 91 is set to 1000 mm, and stop members are provided on both ends of the eaves gutter 91.

[0047] A call pipe 95 is provided at the eaves gutter outlet 93 of the funnel via an elbow 94, and is again connected downward to a downspout pipe 97 via an elbow 96. In this test, the call pipe 95 is 500 mm. In a typical home, drainage from a balcony does not meet the conditions for siphoning. Therefore, in this test, conditions were set to prevent siphoning. In other words, to meet the conditions for siphoning, the length of the downspout pipes 97 and 98 (total) must be 2000 mm or more from the bottom of the eaves gutter 91, but in this test, the total length was set to 1200 mm.

[0048] Then, one of the overflow fittings 13A to 13D is installed 300 mm above the drain outlet 99 at the bottom end of the downspout pipe 98. The drain outlet 99 of the downspout pipe 98 is blocked so that all the supplied water is drained through the overflow drainage path 7.

[0049] The overflow drainage capacity is measured by continuously supplying a fixed amount of water for 10 minutes and checking whether the supply amount exceeds the overflow drainage. That is, the water depth from the bottom of the eaves gutter 91 to the water surface of the supply water is measured, and if the water depth remains stable and unchanged for at least 5 minutes out of the 10 minutes, it is determined that the drainage capacity is sufficient for the supply amount. If the water depth does not stop increasing over the 10 minutes, it is determined that the drainage capacity is insufficient for the supply amount. The stability of the drainage is also evaluated by observing the variation in the water depth during drainage and checking whether the water depth is stable.

[0050] Overflow joints 13A to 13D according to comparative examples 1 and 2 and examples 1 and 2, which are the subject of verification, are shown in FIGS. 5(A) to 5(D). That is, in overflow fitting 13A according to comparative example 1, closing wall surface 133A does not have both an outwardly inclined surface and a downwardly inclined surface, and in overflow fitting 13B according to comparative example 2, closing wall surface 133B does not have an outwardly inclined surface but does have a downwardly inclined surface 135B. In contrast, in overflow joint 13C according to Example 1, closing wall surface 133C has only outward inclined surface 134C and no downward inclined surface, while overflow joint 13D according to Example 2 has both outward inclined surface 133D and downward inclined surface 134D.

[0051] The verification results are shown in Table 1 below. [Table 1]

[0052] As shown in Table 1, in the overflow fittings 13A and 13B of Comparative Examples 1 and 2, which do not have an outward inclined surface, the water level rose during the test, and the water depth increased momentarily and then decreased immediately while rainwater was being supplied. In contrast, in the overflow fittings 13C and 13D of Examples 1 and 2, which have an outward inclined surface, the water level remained stable even after 10 minutes of continuous rainwater supply. Therefore, it can be said that the outward inclined surface contributes to the stability of drainage.

[0053] Furthermore, comparing Examples 1 and 2, it was confirmed that overflow fitting 13D of Example 2, which has a downwardly inclined surface, provides more stable drainage when the water depth is shallow than overflow fitting 13C of Example 1, which does not have a downwardly inclined surface. Incidentally, comparing Comparative Examples 1 and 2 also reveals that overflow fitting 13B of Comparative Example 2, which has a downwardly inclined surface, reduces the frequency of momentary water level increases and decreases compared to overflow fitting 13A of Comparative Example 1, which does not have a downwardly inclined surface. From the above, it can be said that the downwardly inclined surface also contributes to the stability of drainage. These test results showed that it is preferable to provide an outward inclined surface to increase the flow stability of overflow drainage, and furthermore, it is preferable to provide both an outward inclined surface and a downward inclined surface. [Explanation of symbols]

[0054] 1. Overflow water drainage channel structure 3, 103, 203, 303, 403 Overflow fittings 5 Vertical pipe 34,134,234,334,434 Outward-facing slope 51 Pipeline 71 Upward Waterway 72 Outward Waterway 73 Downward Waterway

Claims

1. an overflow joint connected to a downspout having a pipe; an upward water channel inside the pipe that guides overflow water flowing in from the lower end side upward; an outward conduit provided continuously with the upward conduit and directing the overflow water to the outside of the pipeline; a downward water conduit provided continuously with the outward water conduit and directing the overflow water downward; and a first inclined surface extending radially outward of the pipeline as it extends upward is provided on the upper end side of the upward water conduit; An overflow water drainage channel structure characterized by the above.

2. a second inclined surface extending radially outward of the pipeline as it extends downward is provided on the upper end side of the outward water passage; 2. The overflow water drainage channel structure according to claim 1,

3. the upward water channel, the outward water channel, and the downward water channel are formed by connecting the overflow joint to the downspout pipe; 3. The overflow water drainage channel structure according to claim 1 or 2, characterized in that:

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