Rain gutter connection structure

Abstract

To provide a rain gutter connection structure that can increase a drainage amount using a siphon phenomenon which enables drainage while suppressing overflow of rainwater.SOLUTION: A rain gutter connection structure 10 has an eaves gutter 11 for receiving rainwater from a roof, a down pipe 12 for guiding rainwater downward from the eaves gutter 11, a drainage basin 16 for discharging the rainwater guided from the down pipe 12 side to a sewage drainage structure side, and a horizontally drawing pipe 14 connected between the down pipe 12 and the drainage basin 16. The lower end of the down pipe 12 is connected to one end of the horizontally drawing pipe 14 through a first largely bent elbow 13, and a second largely bent elbow 15 is connected to the other end of the horizontally drawing pipe 14.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a gutter connection structure capable of draining rainwater using the siphon effect. [Background technology]

[0002] In response to recent torrential rains, etc., a method of draining rainwater using the siphon effect is being adopted for the connection structure of rain gutters, which require high drainage performance.

[0003] Patent Document 1 describes a gutter system (gutter connection structure) that includes an eaves gutter, a downspout, an elbow (connection joint) that is positioned downstream of the eaves gutter and connected to the upper end of the downspout, and a siphon joint that has a reduced diameter portion and is provided between the two downspouts. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 6835995 Summary of the Invention [Problem to be solved by the invention]

[0005] As a gutter connection structure, when rainwater that falls on a roof or the like is drained to a sewer drainage structure, the rainwater is temporarily stored in a drainage basin installed near the ground or underground and then drained. In a gutter connection structure that can drain rainwater using the siphon effect, the force of the rainwater draining in the downpipe increases as the amount of drainage increases, but if the amount of water downstream of the downpipe cannot be discharged in proportion to the amount of water drained, the rainwater may overflow from the upstream side of the downpipe.

[0006] An object of the present disclosure is to provide a gutter connection structure that can increase drainage volume by using the siphon effect, and that can drain rainwater while suppressing overflow. [Means for solving the problem]

[0007] The gutter connection structure of the present disclosure is a gutter connection structure capable of draining rainwater by using the siphon effect, and comprises an eaves gutter that receives rainwater from a roof, a downspout that guides rainwater downward from the eaves gutter, a drainage manhole that discharges rainwater introduced from the downspout side to the sewer drainage structure side, and a horizontal pipe connected between the downspout and the drainage manhole, and is characterized in that the lower end of the downspout is connected to one end of the horizontal pipe via a first large bend elbow, and a second large bend elbow is connected to the other end of the horizontal pipe. Effect of the Invention

[0008] The gutter connection structure of the present disclosure has large bent elbows connected to both ends of a horizontal pipe connected between a downspout and a drainage manhole, making it possible to drain rainwater into the drainage manhole while preventing overflow, even when the drainage volume increases due to the siphon effect. [Brief description of the drawings]

[0009] [Figure 1] 1 is a schematic diagram showing an entire gutter connection structure of an embodiment. [Diagram 2] FIG. 11 is a schematic diagram showing a part of a gutter connection structure of a comparative example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, the embodiments of the present disclosure will be described in detail with reference to the drawings. In the following description, specific shapes, materials, directions, values, etc. are examples for facilitating understanding of the present disclosure, and can be appropriately changed according to applications, purposes, specifications, etc. In addition, it is initially assumed that the components of the embodiments and modified examples described below can be selectively combined.

[0011] With reference to FIG. 1, the schematic structure of the gutter connection structure 10 of this embodiment will be described. As shown in the upper part of FIG. 1, the gutter connection structure 10 of this embodiment has an eaves gutter 11 installed at the eaves of a building (not shown) and a vertical gutter 12 connected to the eaves gutter 11 to guide rainwater downward. Furthermore, as shown in the lower part of FIG. 1, the gutter connection structure 10 of this embodiment has a lower end (lower vertical gutter 12B) of the vertical gutter 12 near the ground 30 and underground, a first large bend elbow 13, a horizontal pipe 14, a second large bend elbow 15, and a drainage basin 16. The drainage basin 16 has a lower end connected to a pipe 17 and is configured to be able to discharge rainwater to a sewer drainage structure such as a sewer pipe. The drainage basin 16 may be installed underground, or the upper end opening to the ground may be detachably closed with a lid. The pipe of this embodiment is made of resin unless otherwise specified, but it may be made of metal or the like without being limited to resin.

[0012] The eaves gutter 11 is a gutter that is installed along the eaves of a building and receives rainwater from the roof. The cross-sectional shape of the eaves gutter 11 is, for example, approximately rectangular, forming a groove that is open at the top. The eaves gutter 11 is supported by a gutter receiving metal fitting (not shown) provided under the eaves. Rainwater collected by the eaves gutter 11 is discharged to the downpipe 12 from a drainage hole (not shown) provided at the bottom of the eaves gutter 11. The eaves gutter 11 of this embodiment is configured to generate a siphon phenomenon, seal the downstream side of the downpipe 12 in a full water state, and send out rainwater at a high discharge rate. Specifically, when the rainwater flowing through the downpipe 12 exceeds a predetermined flow rate, a plug is formed by the rainwater clogging a part of the downpipe 12. Then, a negative pressure due to the difference in height is generated at the plug, and the force pulling the rainwater downward increases, causing a siphon phenomenon that causes the rainwater to flow down forcefully.

[0013] The downspout 12 is a pipe arranged substantially vertically and directs rainwater from the eaves gutter 11 to a horizontal pipe 14 installed underground. The downspout 12 may be configured by connecting a plurality of pipes with joints (not shown).

[0014] The downspout 12 is composed of an upper downspout 12A and a lower downspout 12B near the ground 30. The lower downspout 12B is located at the bottom of the downspout 12, and a part of it is buried underground. The diameter of the lower downspout 12B is formed to be one size larger than the prescribed size of the diameter of the upper downspout 12A, and the upper downspout 12A is inserted into the lower downspout 12B with a clearance fit.

[0015] The upper downpipe 12A is, for example, a hard polyvinyl chloride pipe VU125 (inner diameter 131 mm, outer diameter 140 mm). The lower downpipe 12B is, for example, a hard polyvinyl chloride pipe VU150 (inner diameter 154 mm, outer diameter 165 mm) that is one size larger than the upper downpipe 12A. However, VP pipes may be used for the upper downpipe 12A and the lower downpipe 12B. The lower end of the lower downpipe 12B is connected to a first large bent elbow 13 underground.

[0016] The gutter connection structure 10 of this embodiment may be applied to gutter connection structures in large stores and warehouses. The lower downspout 12B is located near the ground and may be damaged by collisions, etc. For this reason, the lower downspout 12B is preferably made of metal.

[0017] The first large bent elbow 13 has sockets on both ends and is a joint that connects the vertical downspout 12B to the horizontal lateral pipe 14. A gentle curve is formed between the sockets on both ends of the first large bent elbow 13. The first large bent elbow 13 bends the direction of drainage from the downspout 12 by approximately 90 degrees horizontally.

[0018] Since the first large bend elbow 13 is located downstream of the drainage caused by the siphon phenomenon, it is necessary not to reduce the flow rate of rainwater. Since the first large bend elbow 13 is formed with a gentle curve between the receiving ports at both ends, the flow rate of rainwater flowing in from the lower downspout 12B can flow smoothly without reducing the flow rate. As a specific example of the first large bend elbow 13, for example, a 90° large bend elbow (hereinafter also referred to as an LL-type elbow) is used. By using an LL-type elbow as the joint between the lower downspout 12B and the horizontal pipe 14, the powerful rainwater caused by the siphon phenomenon does not stagnate inside the joint, and the rainwater can flow smoothly.

[0019] The horizontal pipe 14 is a pipe for guiding rainwater from the downspout 12 to the drainage basin 16, and is installed approximately horizontally. One end of the horizontal pipe 14 is connected to a first large bend elbow 13, and the other end is connected to a second large bend elbow 15. Since the horizontal pipe 14 is installed approximately horizontally, it is necessary to set an appropriate length so as not to reduce the flow rate of the rainwater. Details will be described later.

[0020] The second large bend elbow 15 is a joint having sockets on both ends, similar to the first large bend elbow 13. One socket of the second large bend elbow 15 is connected to the horizontal pipe 14. The other socket opens downward into the drainage basin 16. The second large bend elbow 15 bends the rainwater from the horizontal pipe 14 in a substantially horizontal direction by approximately 90 degrees to the vertical direction and discharges it into the drainage basin. The structure of the second large bend elbow 15 is formed with a gentle curve between the sockets on both ends, similar to the first large bend elbow 13. This makes it possible for the second large bend elbow 15 to also guide the rainwater from the horizontal pipe 14 to the drainage basin 16 without reducing the flow rate.

[0021] The drainage basin 16 is a facility that has the function of temporarily storing rainwater. The drainage basin 16 has a substantially rectangular parallelepiped or cylindrical shape. The rainwater temporarily stored in the drainage basin 16 is discharged to the sewer discharge structure through a pipe 17 connected to the side.

[0022] As described above, the gutter connection structure 10 of this embodiment is characterized in that LL-type elbows (first large bend elbow 13, second large bend elbow 15) are provided as joints on both ends of the horizontal pipe 14. The gutter connection structure 10 of this embodiment utilizes the siphon effect to guide rainwater flowing from the eaves gutter 11 via the vertical gutter 12 to the horizontal pipe 14 by the first large bend elbow 13 without stagnation of the rainwater, and further guides the rainwater that has flowed through the horizontal pipe 14 to the drainage basin 16 by the second large bend elbow 15, making it possible to discharge the rainwater without stagnation in the pipe.

[0023] The gutter connection structure 10 of this embodiment will be described in further detail below in comparison with a comparative example.

[0024] FIG. 2 shows a schematic diagram of a gutter connection structure of a comparative example near the ground. The difference from this embodiment is that the elbow 21 and elbow 22 are connected using 90° elbows (hereinafter referred to as DL-type elbows) instead of the first large bend elbow 13 and the second large bend elbow 15. The DL-type elbow has the same nominal diameter as the large bend elbow, but is shorter in length in a direction perpendicular to the central axis of one socket and the central axis of the outer end of the other socket. As a result, the direction of the fluid flowing inside the DL-type elbow can be changed more abruptly than with the large bend elbow. For this reason, if a DL-type elbow is used as a joint for the horizontal pipe 14, water is likely to clog at the inner bend of the DL-type elbow, and rainwater from the downspout 12 cannot flow smoothly, and rainwater may gush out into the eaves gutter 11. The reason for this is as follows. In the elbow 21, which is the joint between the lower downspout 12B and the horizontal pipe 14, if the flow rate of rainwater is large, the water is interrupted at the bent portion 21a of the elbow 21, and the rainwater cannot be continuously drained. If rainwater accumulates at the bent portion 21a, the accumulation may propagate upward to the lower downspout 12B due to rainwater from the top of the downspout 12, and water may gush out from the gap between the lower downspout 12B and the upper downspout 12A. Furthermore, the accumulation of rainwater may propagate from the downspout 12 to the eaves gutter 11, and ultimately the rainwater may overflow from the eaves gutter 11.

[0025] Also, when the elbow 22 connected to the drainage basin 16 side of the horizontal piping 14 is a DL-type elbow, water is likely to become clogged at the bent portion 22a of the elbow 22, and rainwater cannot be drained smoothly. In other words, if a DL-type elbow is used for even one of the joints at both ends of the horizontal piping 14, rainwater cannot be drained smoothly and may overflow.

[0026] The gutter connection structure 10 of this embodiment uses LL-type elbows with a gentle curve between the receiving ports at both ends as joints at both ends of the horizontal pipe 14, which suppresses a decrease in flow rate at the joints and enables rainwater to be smoothly guided to the drainage manhole 16.

[0027] Next, the relationship between the length of each pipe shown in Figure 1 and the drainage performance will be described. The length of the horizontal pipe 14 excluding the fitting parts with the large bend elbows 13, 15 is defined as L1. The rising length of the downspout 12 from the top end of the first large bend elbow 13 (the length of the lower downspout 12B excluding the fitting part with the first large bend elbow 13) is defined as L2. The length from the top end of the first large bend elbow 13 to the bottom end of the upper downspout 12A is defined as L3.

[0028] If the length L1 of the horizontal pipe 14 is too long, it creates resistance and reduces the flow rate. Therefore, if the length L1 of the horizontal pipe 14 is too long, water will accumulate in the lower downspout 12B (rising portion) and there is a risk that water will gush out from the gap between the upper downspout 12A and the lower downspout 12B together with air. Experiments have confirmed that the length L1 of the horizontal pipe 14 is preferably 1.5 m or less. Details will be described later.

[0029] Because water bounces off the first large bent elbow 13 directly below the lower downspout 12B, if the length L2 is short, there is a risk of water gushing out from the gap between the lower downspout 12B and the upper downspout 12A. Therefore, the length L2 of the lower downspout 12B is preferably set to 0.5 m or more. More preferably, the length L2 is set to 1 m or more.

[0030] As described above, the gutter connection structure 10 of this embodiment is configured such that the diameter of the lower downpipe 12B is one size larger than the diameter of the upper downpipe 12A, and the upper downpipe 12A is inserted into the lower downpipe 12B. By inserting the upper downpipe 12A into the lower downpipe 12B, the downpipe 12 can absorb vertical positional deviations caused by thermal expansion and contraction. In addition, the lower downpipe 12B has a diameter one size larger in order to prevent the lower downpipe 12B from cracking due to thermal expansion of the upper downpipe 12A.

[0031] If the insertion amount (L2-L3) of the upper downpipe 12A into the lower downpipe 12B is too large, there will be no place for air to escape, so it is better to increase the distance from the lower end of the lower downpipe 12B to the first large bent elbow 13. On the other hand, it is preferable to insert about 0.2m to 0.3m into the lower downpipe 12B so that the upper downpipe 12A does not come out when it shrinks due to thermal expansion and contraction. Also, it is preferable to set the length L3 from the upper end of the first large bent elbow 13 to the lower end of the upper downpipe 12A to 0.3m or more. Details will be described in the explanation of the experimental results below.

[0032] Next, the results of experiments conducted to verify the above effects will be described. <Experimental result 1> An experiment was conducted on the relationship between the length L1 of the horizontal pipe 14 and the overflow of rainwater. The difference due to the type of elbow of the joint was also verified. The rain gutter connection structure of Examples 1 to 5 is the configuration shown in FIG. 1, and only the length L1 of the horizontal pipe 14 is changed. As Comparative Examples 1 to 6, verification was conducted with the connection structure shown in FIG. 2, which uses a DL-type elbow as a joint. The overflow of rainwater was evaluated by evaluating whether water overflows into the eaves gutter when a sufficient amount of water (causing a siphon phenomenon) flows from the eaves gutter to the vertical gutter. Table 1 shows the experimental results when the length L1 of the horizontal pipe is changed. As Comparative Example 7, the experimental results of a configuration in which an LL-type elbow is used but the horizontal pipe 14 is omitted are also shown.

[0033] [Table 1]

[0034] In Table 1, the evaluations are expressed as ◯, △, and ×. ◯ indicates a state in which water can be drained smoothly without overflowing. △ indicates a state in which there is an effect of suppressing water overflow, but there is a possibility of lack of stability. × indicates a state in which water cannot be drained smoothly and overflows. From Table 1, it was confirmed that when a DL-type elbow was used as a joint, water overflow occurred regardless of the length of L1. This shows that it is necessary to use an LL-type elbow as a joint, rather than a DL-type elbow. Furthermore, when an LL-type elbow was used, the effect of suppressing water overflow was reduced when the length L1 of the horizontal pipe was 2m or more. On the other hand, when the length L1 of the horizontal pipe was 1.5m or less, no water overflow was confirmed.

[0035] From the above results, it can be said that it is preferable to set the length L1 of the horizontal pipe to L1≦1.5 m.

[0036] <Experimental result 2> Next, using Examples 6 to 10, an experiment was conducted on the relationship between the distance L3 between the bottom end of the upper downspout and the first large bent elbow and the overflow of rainwater. The rainwater connection structure of Examples 6 to 10 is the same as that of Example 1, as shown in FIG. 1, but the distance L3 between the bottom end of the upper downspout and the first large bent elbow is changed. As in Experimental Result 1, the overflow of rainwater was evaluated by evaluating whether water overflows into the eaves gutter when a sufficient amount of water (causing a siphon phenomenon) is flowed from the eaves gutter to the downspout. Table 2 shows the experimental results when the distance L3 between the bottom end of the upper downspout and the first large bent elbow is changed. The meanings of ◯, △, and × in Table 2 are the same as those in Table 1.

[0037] [Table 2]

[0038] If the distance L3 between the bottom of the upper downspout and the first large bent elbow is short, there is less room for air to escape, making it easier for water to become clogged. If the distance L3 is 0.2m or less, the effect of preventing water overflow is reduced. On the other hand, if the distance L3 is 0.3m or more, no water overflow was observed.

[0039] From the above results, it can be said that it is preferable that the distance L3 between the lower end of the upper downspout and the first large curved elbow be 0.3 m or more.

[0040] As described above, according to the gutter connection structure disclosed herein, in a gutter connection structure in which the drainage volume is increased by using the siphon effect, it is possible to realize a gutter connection structure that allows drainage while suppressing rainwater overflow. [Explanation of symbols]

[0041] 10 rain gutter connection structure, 11 eaves gutter, 12 vertical gutter, 12A upper vertical gutter, 12B lower vertical gutter, 13 first large bend elbow, 14 horizontal piping, 15 second large bend elbow, 16 drainage basin, 17 piping, 21, 22 elbow, 30 ground

Claims

1. A connection structure for a rain gutter that can drain rainwater using a siphon effect, A gutter to catch rainwater from the roof, A downspout that guides rainwater downward from the eaves gutter; A drainage basin that discharges the rainwater introduced from the downspout side to a sewer drainage structure; A horizontal pipe connected between the downspout and the drainage basin, The lower end of the downspout is connected to one end of the horizontal pipe via a first large bend elbow, A second large bend elbow is connected to the other end of the horizontal pipe. Rain gutter connection structure.

2. In the horizontal piping, the length of the portion excluding the fitting portions at both ends with respect to the first large bend elbow and the second large bend elbow is 1.5 m or less. The gutter connection structure according to claim 1.

3. The downspout has an upper downspout provided at an upper portion and a lower downspout communicating with a lower portion of the upper downspout, The upper downspout is inserted into the lower downspout. A gutter connection structure according to claim 1 or 2.

4. A distance of 0.3 m or more is provided between the lower end of the upper downspout and the upper end of the first large bend elbow. A gutter connection structure according to claim 3.

5. The insertion length of the upper downspout inserted into the lower downspout is 0.2 m or more and 0.3 m or less. A gutter connection structure according to claim 3 or 4.

6. The downspout is made of metal. A gutter connection structure according to any one of claims 3 to 5.

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