Eaves gutter, bracket, and eaves gutter support structure

Abstract

To provide: an eaves gutter that can reduce occurrence of drainage performance deterioration and overflow; a bracket that can reduce deformation of the eaves gutter; and an eaves gutter support structure which can reduce occurrence of drainage performance deterioration and overflow, and further can reduce deformation of the eaves gutter.SOLUTION: An eaves gutter 2 comprises a bottom wall 20, and first and second sidewalls 21, 22 which extend upwards from respective sides in the width direction of the bottom wall 20. When it is assumed that the length of a first straight line S1 connecting a top edge 21a and a bottom edge 21b of the first sidewall 21 is L1, the angle between the thickness direction of the bottom wall 20 and the first straight line S1 is θ1, the height of the first sidewall 21 is H1, the length of a second straight line S2 connecting a top edge 22a and a bottom edge 22b of the second sidewall 22 is L2, the angle between the thickness direction of the bottom wall 20 and the second straight line S2 is θ2, the height of the second sidewall 22 is H2, and the width of the bottom wall 20 is W, H1=L1cosθ1, H2=L2cosθ2, |θ1|≤10°, |θ2|≤10°, H1≥H2, W≥200 mm, and H2≥200 mm are satisfied.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to an eaves gutter, a receiving device, and an eaves gutter support structure. [Background technology]

[0002] Patent Document 1 discloses an eaves gutter and an eaves gutter hanger. In Patent Document 1, ears are provided on both upper ends of the eaves gutter. The eaves gutter hanger has roughly U-shaped ear support parts at both ends of the eaves gutter hanger body for fitting and supporting the ears of the eaves gutter, and the eaves gutter hanger body is provided with an elastic anti-detachment piece whose tip faces the inner surface of the eaves gutter ear that fits into the ear support parts. The tip of the anti-detachment piece is provided with an L-shaped bent piece that is bent upward in an L shape. A protrusion is provided at one corner of the L-shaped bent piece, protruding toward the ear support part. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2009-108480 Summary of the Invention [Problem to be solved by the invention]

[0004] In eaves gutters such as those described in Patent Document 1, it is required to reduce the deterioration of drainage performance and the occurrence of overflow. In components for attaching eaves gutters to buildings, such as the eaves gutter hanger described in Patent Document 1, it is required to be able to reduce deformation of the eaves gutters.

[0005] The present disclosure provides an eaves gutter that can reduce the deterioration of drainage performance and the occurrence of overflow.The present disclosure provides a support device that can reduce deformation of the eaves gutter, which can reduce the deterioration of drainage performance and the occurrence of overflow.The present disclosure provides an eaves gutter support structure that can reduce the deterioration of drainage performance and the occurrence of overflow, and further reduce deformation of the eaves gutter. [Means for solving the problem]

[0006] An eaves gutter according to one aspect of the present disclosure includes a bottom wall and first and second side walls extending upward from both sides of the bottom wall in a width direction. Let L1 be the length of a first line connecting the upper and lower ends of the first side wall, θ1 be the angle between the first line and the thickness direction of the bottom wall, H1 be the height of the first side wall, L2 be the length of a second line connecting the upper and lower ends of the second side wall, θ2 be the angle between the thickness direction of the bottom wall and the second line, H2 be the height of the second side wall, and W be the width of the bottom wall. The following relationships are satisfied: H1=L1cosθ1, H2=L2cosθ2, |θ1|≦10°, |θ2|≦10°, H1≧H2, W≧200 mm, and H2≧200 mm.

[0007] A receiving device according to another aspect of the present disclosure is a receiving device that supports the above-mentioned eaves gutter, wherein the eaves gutter is located at at least one of the upper ends of the first side wall and the second side wall and has a protruding portion that protrudes to at least one of the outer and inner sides of the eaves gutter. The receiving device includes a support portion that extends in the width direction of the bottom wall of the eaves gutter and supports the underside of the bottom wall, first and second arms that extend upward from both sides of the support portion, and a connecting portion that is located on at least one of the first arm and second arm and connects to the protruding portion of the eaves gutter from above.

[0008] An eaves gutter support structure according to yet another aspect of the present disclosure comprises the above-mentioned eaves gutter and a receiving device for supporting the eaves gutter. The eaves gutter is located at at least one of the upper ends of the first side wall and the second side wall and has a protruding portion that protrudes to at least one of the outer and inner sides of the eaves gutter. The receiving device comprises a support portion that extends in the width direction of the bottom wall of the eaves gutter and supports the underside of the bottom wall, first and second arms that extend upward from both sides of the support portion, and a connecting portion that is located on at least one of the first arm and second arm and connects to the protruding portion of the eaves gutter from above. [Effects of the Invention]

[0009] One aspect of the present disclosure can reduce degradation of drainage performance and the occurrence of overflow. Another aspect of the present disclosure can reduce deformation of eaves gutters, which can reduce degradation of drainage performance and the occurrence of overflow. Yet another aspect of the present disclosure can reduce degradation of drainage performance and the occurrence of overflow, and further reduce deformation of eaves gutters. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a schematic diagram of a configuration example of a rain gutter system according to a first embodiment; [Figure 2] Top view of the configuration example of the eaves gutter support structure of the gutter system in Figure 1 [Figure 3] Partial perspective view of the eaves gutter support structure of Figure 2 [Figure 4] Cross section of the eaves gutter support structure in Figure 2 [Figure 5] Cross section of the eaves gutter support structure in Figure 2 [Figure 6] Cross-sectional view of the support fixture for the eaves gutter support structure in Figure 2 [Figure 7] Partially enlarged view of the receiving tool in Figure 6 [Figure 8] Cross-sectional view of a configuration example of an eaves gutter support structure according to a second embodiment [Figure 9] Cross section of the eaves gutter support structure in Figure 8 [Figure 10] Cross-sectional view of a configuration example of an eaves gutter support structure according to a third embodiment [Figure 11] Cross-sectional view of a configuration example of an eaves gutter support structure according to a fourth embodiment [Figure 12] Partially enlarged view of the receiving tool in Figure 11 [Figure 13] Cross-sectional view of a configuration example of an eaves gutter support structure according to a fifth embodiment [Figure 14] An explanatory diagram of an example of the operation of the eaves gutter support structure of FIG. 13. [Figure 15] Cross-sectional view of a configuration example of an eaves gutter support structure according to a sixth embodiment [Figure 16] Cross section of the eaves gutter support structure of Figure 15 [Figure 17] Cross-sectional view of a configuration example of an eaves gutter support structure according to a seventh embodiment DETAILED DESCRIPTION OF THE INVENTION

[0011] [1. Embodiment] Hereinafter, embodiments will be described in detail with reference to the drawings as appropriate. However, more detailed description than necessary may be omitted. For example, detailed description of already well-known matters or redundant description of substantially identical configurations may be omitted. This is to avoid unnecessary redundancy in the following description and to facilitate understanding by those skilled in the art. Note that the inventor(s) provide the accompanying drawings and the following description to enable those skilled in the art to fully understand the present disclosure, and are not intended to limit the subject matter described in the claims.

[0012] Unless otherwise specified, the positional relationships such as up, down, left, and right are based on the positional relationships shown in the drawings. Each drawing described in the following embodiments is a schematic drawing, and the ratios of the size and thickness of each component in each drawing do not necessarily reflect the actual dimensional ratios. Furthermore, the dimensional ratios of each component are not limited to the ratios shown in the drawings.

[0013] 1.1 First Embodiment [1.1.1 Configuration] FIG. 1 is a schematic diagram of an example configuration of a rain gutter system 1 according to a first embodiment. The rain gutter system 1 is a type of piping system. The rain gutter system 1 receives rainwater from a roof 10a of a building 10 and channels it into a manhole 12 on the ground 11. The rainwater collected in the manhole 12 flows from the manhole 12 through an underground pipe 13 and out into a rainwater drain. The building 10 is, for example, a non-residential facility such as a store, office, factory, building, school, welfare facility, or hospital, or a residential facility such as a detached house, an apartment building, or an individual dwelling unit of a detached house or an apartment building. Non-residential facilities also include theaters, movie theaters, public halls, amusement parks, complexes, department stores, hotels, inns, kindergartens, libraries, museums, art galleries, underground shopping malls, stations, airports, and the like.

[0014] The gutter system 1 of FIG. 1 includes an eaves gutter support structure 4, a drain 5, and a drainage section 6.

[0015] Fig. 2 is a top view of an example of the configuration of the eaves gutter support structure 4 of the rain gutter system 1. Fig. 3 is a partial perspective view of the eaves gutter support structure 4. Fig. 4 is a cross-sectional view of the eaves gutter support structure 4.

[0016] As shown in Figures 2 to 4, the eaves gutter support structure 4 includes an eaves gutter 2 and a receiving device 3. The eaves gutter support structure 4 of Figure 2 includes a plurality of receiving devices 3. The number and positions of the receiving devices 3 may be set appropriately depending on the shape of the building 10, etc.

[0017] The eaves gutter 2 receives rainwater from the roof 10a of the building 10. The eaves gutter 2 in FIG. 2 is installed at the eaves of the roof 10a of the building 10. In particular, the eaves gutter 2 is arranged to extend along the eaves of the roof 10a of the building 10.

[0018] 2, 3, and 4, the eaves gutter 2 includes a bottom wall 20, a first side wall 21, a second side wall 22, and a protrusion 23. The first side wall 21 and the second side wall 22 are also called standing walls.

[0019] The bottom wall 20 is in the form of a plate having a length, width, and thickness. The bottom wall 20 in Fig. 2 is in the form of a rectangular plate. In the length direction of the bottom wall 20, the width and thickness of the bottom wall 20 are approximately constant. A drop opening 20a is formed in the bottom wall 20 in accordance with the overall design of the gutter system 1.

[0020] The first side wall 21 and the second side wall 22 extend upward from both sides in the width direction of the bottom wall 20. In particular, the second side wall 22 extends upward from the end of the bottom wall 20 on the building 10 side in the width direction, and the first side wall 21 extends upward from the end of the bottom wall 20 on the opposite side from the building 10 in the width direction. The first side wall 21 and the second side wall 22 are plate-shaped with a length, width, and thickness. The first side wall 21 and the second side wall 22 are rectangular plate-shaped. In the length direction of the first side wall 21, the width and thickness of the first side wall 21 are approximately constant. In the length direction of the second side wall 22, the width and thickness of the second side wall 22 are approximately constant.

[0021] The protrusion 23 is located at the upper end 21a of the first side wall 21 and protrudes toward the inside of the eaves gutter 2. The inside of the eaves gutter 2 is the direction from both sides in the width direction of the bottom wall 20 toward the center in the width direction of the bottom wall 20. The protrusion 23 in Figure 5 includes a first piece 231 extending from the upper end 21a of the first side wall 21 toward the inside of the eaves gutter 2, a second piece 232 extending from the tip of the first piece 231 toward the bottom wall 20 side of the eaves gutter 2, and a third piece 233 extending from the tip of the second piece 232 toward the first side wall 21 side of the eaves gutter 2. In a plane perpendicular to the longitudinal direction of the bottom wall 20 of the eaves gutter 2, the protrusion 23 is approximately U-shaped.

[0022] In this embodiment, the bottom wall 20, first side wall 21, second side wall 22, and protrusion 23 are integrally formed. The bottom wall 20, first side wall 21, second side wall 22, and protrusion 23 constitute the eaves gutter member 2a. The eaves gutter member 2a, that is, the bottom wall 20, first side wall 21, second side wall 22, and protrusion 23, are formed, for example, by extrusion molding of a resin material. The eaves gutter member 2a may include a core material to reinforce the strength of the entire eaves gutter 2. The core material may be made of, for example, metal.

[0023] In this embodiment, the eaves gutter 2 is transported to the construction site in a predetermined shape formed by extrusion molding of a resin material. Unlike when eaves gutters are formed from metal plates, such as steel plates (also called coils), no on-site processing is required. Specifically, since there is no need to perform processes on-site, such as cutting the coil, bending the coil, applying sealant to seal joints, and curing, there is no need to perform the process on-site, and the construction of the gutter system 1 can be easily performed without the problem of increasing the number of on-site work steps.

[0024] The eaves gutter 2 in Figure 2 comprises end members 2b and 2c in addition to the eaves gutter member 2a. The end members 2b and 2c are fixed to both longitudinal sides of the bottom wall 20 of the eaves gutter member 2a. The end members 2b and 2c are plate-shaped and cover the openings on both longitudinal sides of the bottom wall 20 of the eaves gutter member 2a. The eaves gutter 2 in Figure 2 comprises three members: the eaves gutter member 2a and the end members 2b and 2c, and the eaves gutter member 2a comprises the bottom wall 20, a first side wall 21, a second side wall 22, and a protrusion 23.

[0025] FIG. 5 is a cross-sectional view of the eaves gutter 2. In the eaves gutter 2 of FIG. 5, let the length of the first straight line S1 connecting the upper end 21a and the lower end 21b of the first side wall 21 be L1, the angle between the thickness direction of the bottom wall 20 and the first straight line S1 be θ1, and the height of the first side wall 21 be H1. The eaves gutter 2 satisfies H1 = L1cosθ1. In the eaves gutter 2 of FIG. 5, the length L1 of the straight line S1 is equal to the width of the first side wall 21.

[0026] In the eaves gutter 2 of FIG. 5, let the length of the second straight line S2 connecting the upper end 22a and the lower end 22b of the second side wall 22 be L2, the angle between the thickness direction of the bottom wall 20 and the second straight line S2 be θ2, and the height of the second side wall 22 be H2. The eaves gutter 2 satisfies H2 = L2cosθ2. In the eaves gutter 2 of FIG. 5, the length L2 of the straight line S2 is equal to the width of the second side wall 22.

[0027] The eaves gutter 2 of FIG. 5 satisfies |θ1| ≤ 10°. For θ1, the direction in which the upper end 21a of the first side wall 21 moves away from the upper end 22a of the second side wall 22 (the counterclockwise direction in FIG. 5) is taken as the positive direction. The eaves gutter 2 preferably satisfies θ1 ≥ 0°.

[0028] The eaves gutter 2 of FIG. 5 satisfies |θ2| ≤ 10°. For θ2, the direction in which the upper end 2二十二a of the second side wall 22 moves away from the upper end 21a of the first side wall 21 (the clockwise direction in FIG. 5) is taken as the positive direction. The eaves gutter 2 preferably satisfies θ2 ≥ 0°.

[0029] In the present embodiment, the first side wall 21 is on the side opposite to the building 10 with respect to the second side wall 22. When H1 < H2, the rainwater accumulated in the eaves gutter 2 is likely to leak to the side opposite to the building 10. From the above, the eaves gutter 2 of FIG. 5 satisfies H1 ≥ H2. That is, the eaves gutter 2 satisfies L1cosθ1 ≥ L2cosθ2. In particular, in the eaves gutter 2 of FIG. 5, H1 > H2.

[0030] In the eaves gutter 2, localized drops in the water level are likely to occur in the region R1 on both sides of the drop opening 20a in the width direction of the bottom wall 20. The region R1 is in the shape of a right triangle. The narrower the region R1, the greater the impact of localized drops in the water level. In the eaves gutter 2, when the water level drops and the drain 5 is exposed above the water surface, air can flow in from the drain 5. The inflow of air from the drain 5 is one of the causes of reduced drainage efficiency due to the siphon effect. This tendency is thought to become more pronounced the greater the flow rate. However, the sizes of eaves gutters proposed in the past did not sufficiently reduce drainage performance.

[0031] According to JIS K 6741 "Rigid Polyvinyl Chloride Pipe" (General Standard), the inner diameter of a VU pipe with a nominal diameter of 125 mm is approximately 131 mm. In this case, the inner diameter d of the drop opening 20a shown in Figure 2 is also set to 131 mm. When the center of the drop opening 20a coincides with the center of the bottom wall 20 in the width direction, there is a margin of distance X on both sides of the drop opening 20a. The larger the distance X, the larger the area R1, which can reduce the impact of localized water level drop. The inner diameter d of the drop opening 20a, the distance X, and the shortest distance W1 between the first and second side walls 21 and 22 satisfy the relationship W1 = d + 2X. To ensure sufficient margin when using a VU pipe with a nominal diameter of 125 mm, the eaves gutter 2 in Figure 5 should satisfy W1 ≥ 200 mm. Typically, the thickness of the bottom wall 20, first side wall 21, and second side wall 22 of the eaves gutter 2 is about a few millimeters, and the shortest distance W1 between the first and second side walls 21, 22 can be considered to be substantially equal to the width W of the bottom wall 20. Therefore, the eaves gutter 2 in Figure 5 should satisfy W1 ≥ 200 mm. This can prevent air from flowing into the drain 5 even at high flow rates, preventing a decrease in drainage performance.

[0032] It is preferable that the eaves gutter 2 has a capacity that prevents rainwater from overflowing until siphoning occurs. However, the sizes of eaves gutter designs proposed in the past have not been sufficient to prevent overflow. In the eaves gutter 2 of this embodiment, as described above, W is set to 200 mm or more to reduce drainage performance. From the perspective of preventing overflow, consider the case where W = 200 mm. It is known that siphoning does not occur instantaneously in eaves gutter 2, but rather takes some time. Furthermore, considering the time it takes for siphoning to occur when the rainfall is 160 mm / h, it has been found that if overflow does not occur until 16 seconds have passed since the rain started, rainwater can be drained without overflowing due to siphoning. Therefore, from this perspective, it is preferable that the eaves gutter 2 in Figure 5 satisfies H2 ≥ 200 mm. This ensures a sufficiently safe height for the eaves gutter 2, taking into account the lead time until siphoning occurs.

[0033] From the viewpoint of ensuring a sufficient margin, it is preferable that the eaves gutter 2 satisfy W≧240 mm. It is more preferable that the eaves gutter 2 satisfy W≧350 mm.

[0034] Since the eaves gutter 2 is relatively thin, if W becomes too large, it may become difficult to maintain the shape of the eaves gutter 2 itself. From this perspective, it is preferable that the eaves gutter 2 satisfy W≦450 mm. It is more preferable that the eaves gutter 2 satisfy W≦400 mm.

[0035] In the eaves gutter 2, as W increases, the force moment applied to the receiver 3 by the first side wall 21 increases. If the force moment applied to the receiver 3 increases, the required strength of the receiver 3 may increase. Therefore, it is better not to set W too large. If W is larger than H2, the eaves gutter 2 will have a flattened shape overall. If the eaves gutter 2 has a flattened shape, rainwater falling into the eaves gutter 2 from the roof 10a is more likely to hit the bottom wall 20, splash, and escape from the eaves gutter 2 to the outside. In other words, the eaves gutter 2 may have difficulty receiving rainwater from the roof 10a. Furthermore, the area of the bottom wall 20 (the base area of the eaves gutter 2) increases, making it more susceptible to the effects of wind, etc. From the above, in terms of the relationship between H2 and W, it is preferable that the eaves gutter 2 satisfy H2 / W≧0.5. In particular, it is more preferable that the eaves gutter 2 satisfy H2 / W≧2 / 3.

[0036] In the eaves gutter 2, if H2 becomes large, the eaves gutter 2 will have an overall vertically elongated shape. If the eaves gutter 2 has a vertically elongated shape, the vertical dimension of the eaves gutter 2 will be too large compared to the thickness of the roof 10a. For the above reasons, it is preferable that the eaves gutter 2 satisfy H2 / W≦2.5.

[0037] The receiving fixture 3 supports the eaves gutter 2. The receiving fixture 3 is used to install the eaves gutter 2 at the eaves of the roof 10a of the building 10.

[0038] 6 is a cross-sectional view of the receiver 3. The receiver 3 includes a support portion 30, first and second arm portions 31 and 32, a joining portion 33, a connecting portion , and a fixing portion .

[0039] 4, the support portion 30 extends in the width direction of the bottom wall 20 of the eaves gutter 2 and supports the lower surface of the bottom wall 20. The support portion 30 is in the shape of a plate having a length, width and thickness.

[0040] The fixing portion 35 extends downward from a first end in the length direction of the support portion 30. The fixing portion 35 is a plate-like member having a length, width, and thickness. In Fig. 6, the fixing portion 35 is integrally formed with the support portion 30 so as to extend downward from the first end in the length direction of the support portion 30.

[0041] The first arm 31 and the second arm 32 extend upward from both sides of the support part 30. Each of the first arm 31 and the second arm 32 is plate-shaped and has a length, width, and thickness. The first arm 31 is connected to the support part 30 by a fixing part 35. The lower end portion of the first arm 31 is connected to the fixing part 35 with a screw 3c, thereby fixing the first arm 31 to the support part 30. The second arm 32 is formed integrally with the support part 30 so as to extend upward from a second end of the support part 30 in the longitudinal direction.

[0042] As shown in FIG. 4, the first arm 31 corresponds to the first side wall 21 of the eaves gutter 2. The first arm 31 has a shape that extends along the outer surface of the first side wall 21 of the eaves gutter 2. The outer surface of the first side wall 21 is the surface of the first side wall 21 opposite to the second side wall 22. As shown in FIG. 4, the second arm 32 corresponds to the second side wall 22 of the eaves gutter 2. The second arm 32 has a shape that extends along the outer surface of the second side wall 22 of the eaves gutter 2. The outer surface of the second side wall 22 is the surface of the second side wall 22 opposite to the first side wall 21.

[0043] The connecting portion 33 is located on the first arm 31. The connecting portion 33 is configured to connect to the protruding portion 23 of the eaves gutter 2 from above (see FIG. 4). The connecting portion 33 in FIG. 6 comprises a first piece 331 extending from the first arm 31 toward the second arm 32, and a second piece 332 extending from the tip of the first piece 331 toward the support portion 30. The connecting portion 33 forms a recess 333 between the first arm 31 and the first piece 331 and the second piece 332. As shown in FIG. 4, the recess 333 is sized so that the protruding portion 23 of the eaves gutter 2 can fit into it.

[0044] The dimensions of the connecting part 33 can be set so that the protruding part 23 does not come off the connecting part 33, that is, so that the protruding part 23 does not come out of the recess 333 of the connecting part 33, during normal use of the gutter system 1. In the installation environment of the gutter system 1, the eaves gutter 2 may sway in the wind, and in such cases it is desirable that the protruding part 23 does not come off the connecting part 33.

[0045] The dimensions of the connecting portion 33 can be set, for example, taking into consideration g1 and g2 in FIG. 4. g1 in FIG. 4 is the dimension (vertical dimension) of the space between the protrusion 23 and the first piece 331 of the connecting portion 33. g2 in FIG. 4 is the dimension (vertical dimension) of the area where the protrusion 23 and the second piece 332 of the connecting portion 33 overlap. As an example, g1 may be 1 mm or less. g2 may satisfy the condition g2≧2×g1. By setting g1 in this manner, even if the eaves gutter 2 is bent due to wind or other factors, the protrusion 23 of the eaves gutter 2 is less likely to come off the connecting portion 33. Note that the above values of g1 and g2 are merely examples. The dimensions of the connecting portion 33 may be set so that the connecting portion 33 is connected to the protrusion 23 and does not come off due to wind or other factors. By appropriately setting g1 and g2, the ease of connection between the connecting portion 33 and the protrusion 23 can be appropriately set.

[0046] By connecting the protrusion 23 to the connecting portion 33, the first side wall 21 of the eaves gutter 2 can be supported by the receiving device 3. This makes it possible to reduce deformation of the eaves gutter 2, particularly deformation of the first side wall 21, such as the first side wall 21 falling inward (towards the second side wall 22) or, conversely, the first side wall 21 falling outward (the opposite side from the second side wall 22).

[0047] In particular, in the eaves gutter 2, at least the bottom wall 20, the first side wall 21, and the second side wall 22 are integrally formed by extrusion molding of a resin material. Therefore, the strength of the first side wall 21 and the second side wall 22 is reduced compared to when the entire eaves gutter is formed from a metal plate. The first side wall 21 and the second side wall 22 are susceptible to relatively large forces due to the influence of wind pressure and pressure from rainwater, etc., that accumulates in the eaves gutter 2. An eaves gutter formed entirely from a metal plate is directly fixed to the receiving fixture with screws or the like. However, considering the reduced strength of the first side wall 21 and the second side wall 22 when a resin material is used, direct fixation with screws or the like can contribute to damage to the first side wall 21 and the second side wall 22 themselves. In this embodiment, the protrusion 23 of the eaves gutter 2 fits into the recess 333 of the connecting portion 33 of the receiving fixture 3, thereby connecting the protrusion 23 to the connecting portion 33, eliminating the need for screws or the like and preventing damage to the eaves gutter 2.

[0048] The connecting portion 34 connects the first arm 31 and the second arm 32 on the upper surface side of the bottom wall 20 of the eaves gutter 2. The connecting portion 34 prevents the first arm 31 and the second arm 32 from deforming in a direction away from each other. As a result, even if the first side wall 21 and the second side wall 22 of the eaves gutter 2 attempt to deform in a direction away from each other, the first arm 31 and the second arm 32 reduce the possibility of such deformation. The connecting portion 34 in FIG. 6 connects the upper end of the first arm 31 and the upper end of the second arm 32. The connecting portion 34 in FIG. 6 has a first portion 341 extending from the upper end of the first arm 31 toward the second arm 32, and a second portion 342 extending from the upper end of the second arm 32 toward the first arm 31. The first portion 341 is formed integrally with the first arm 31. The second portion 342 is formed integrally with the second arm portion 32. The first portion 341 and the second portion 3421 are connected to each other by a screw 3d. The screw 3d may be used to attach the receiver 3 to the roof 10a of the building 10.

[0049] The receiving tool 3 in FIG. 6 is composed of two members: a first member 3a and a second member 3b. Both the first member 3a and the second member 3b are made of a metal material. The first member 3a in FIG. 6 includes a first arm 31, a joining portion 33, and a first portion 341 of the connecting portion 34. The first member 3a is formed by bending a metal plate. The metal plate has, for example, a substantially constant width and thickness in the length direction. Therefore, the first arm 31, the joining portion 33, and the first portion 341 of the connecting portion 34 are made of the same metal plate.

[0050] Fig. 7 is a partially enlarged view of the receiver 3. As shown in Fig. 7, the first arm 31 is formed from a metal plate 300. The connecting portion 33 is formed by bending a portion of the metal plate 300. In Fig. 7, the connecting portion 33 is formed by cutting and raising a portion 301 in the center in the width direction of the metal plate 300. By forming the connecting portion 33, an opening 302 exists in the metal plate 300.

[0051] 6 includes a support portion 30, a second arm portion 32, a second portion 342 of the connecting portion 34, and a fixing portion 35. The second member 3b is formed by bending a metal plate. The metal plate has, for example, a substantially constant width and thickness in the length direction.

[0052] An example of the metal plate material used to form the first member 3a and the second member 3b is a plated steel plate. The thickness of the metal plate material is, for example, about 3 mm to 4 mm. The width of the metal plate material is, for example, about 20 mm. In this case, the width of the joint portion 33 may be about 10 mm.

[0053] In the eaves gutter support structure 4 of this embodiment, the receiver 3 is attached to the eaves gutter 2 as shown in Figures 2 to 4. In particular, when attaching the eaves gutter 2 to the receiver 3, the bottom wall 20, first side wall 21, and second side wall 22 of the eaves gutter 2 are positioned so that they come into contact with the support portion 30, first arm portion 31, and second arm portion 32 of the receiver 3, respectively, and further, the protruding portion 23 of the eaves gutter 2 is joined to the connecting portion 33 of the receiver 3. In this way, the protruding portion 23 located at the upper end of the first side wall 21 of the eaves gutter 2 is joined to the connecting portion 33 of the receiver 3. This reduces deformation of the eaves gutter 2.

[0054] The drain 5 is disposed at the outlet 20a of the eaves gutter 2. The drain 5 reduces the generation of vortices and the entrainment of air at the outlet 20a. The drain 5 may contribute to the generation of siphoning. The drain 5 may have a known configuration.

[0055] The drainage section 6 is installed to drain rainwater from the outlet 20a of the eaves gutter 2 into the inlet section 12. The drainage section 6 in Fig. 1 includes a downspout 61, a common gutter 62, a first elbow 63, a second elbow 64, and an auxiliary downspout 65. As an example, the length of the downspout 61 is 10 m, the length of the common gutter 62 is 1 m, and the length of the auxiliary downspout 65 is 0.2 m.

[0056] The downspout 61 forms a flow path for vertically flowing rainwater from the outlet 20a of the eaves gutter 2. The downspout 61 is a straight pipe. The cross section of the downspout 61 perpendicular to the pipe axis is circular. The downspout 61 is made of, for example, rigid polyvinyl chloride. The dimensions of the downspout 61, such as the outer shape and thickness, may be set in accordance with the standard for rigid polyvinyl chloride pipe (general) specified in JIS K 6741 "Rigid Polyvinyl Chloride Pipe." The downspout 61 in FIG. 1 is arranged so that the pipe axis of the downspout 61 is aligned with the up-down direction (vertical direction). The downspout 61 has an upstream end and a downstream end. The upstream end of the downspout 61 is the end of the downspout 61 that is connected to the outlet 20a (the upper end in FIG. 1). The downstream end of the downspout 61 is the end (the lower end in FIG. 1) of the downspout 61 that is inserted into the manhole 12. In FIG. 1, a drain pipe cover 61a is arranged to prevent rainwater from flowing into the manhole 12 through the gap between the downspout 61 and the manhole 12.

[0057] 1, the downspout 61 is not directly connected to the drop outlet 20a. In the drainage section 6, the downspout 61 is connected to the drop outlet 20a via a referral downspout 62, a first elbow 63, a second elbow 64, and an auxiliary downspout 65.

[0058] The downspout 62 is a part for draining rainwater from the building 10 from the drop outlet 20a of the eaves gutter 2 to the downspout 61. The downspout 62 is located between the downspout 20a for rainwater from the building 10 and the downspout 61. The downspout 62 forms a flow path for draining rainwater from the drop outlet 20a approximately horizontally. The downspout 62 has an upstream end and a downstream end. The upstream end of the downspout 62 is the end of the downspout 62 that is connected to the drop outlet 20a (the left end in Figure 1). The downstream end of the downspout 62 is the end of the downspout 62 that is connected to the downspout 61 (the right end in Figure 1).

[0059] The first elbow 63 connects the upstream end of the downspout 62 to the outlet 20a. The first elbow 63 does not necessarily connect the upstream end of the downspout 62 directly to the outlet 20a, but may instead connect the upstream end of the downspout 62 to the outlet 20a indirectly via another member. The material of the first elbow 63 is, for example, rigid polyvinyl chloride. The first elbow 63 has upstream and downstream sockets for connecting pipes such as the downspout 61 and the downspout 62 to the first elbow 63. The angle between the central axes of the upstream and downstream sockets is, for example, 91.17°, as specified in JIS K 6739 "Rigid Polyvinyl Chloride Pipe Joints for Drainage." The inner and outer corners of the first elbow 63 in a plane including the pipe axis of the first elbow 63 are not rounded but are approximately right-angled.

[0060] The second elbow 64 connects the downstream end of the downspout 62 to the upstream end of the downspout 61. The second elbow 64 does not necessarily connect the downstream end of the downspout 62 directly to the upstream end of the downspout 61, but may instead connect the downstream end of the downspout 62 to the upstream end of the downspout 61 indirectly via another member. The second elbow 64 is made of, for example, rigid polyvinyl chloride. The second elbow 64 has upstream and downstream sockets for connecting pipes such as the downspout 61 and the downspout 62 to the second elbow 64. The angle between the central axes of the upstream and downstream sockets is, for example, 91.17°, as specified in JIS K 6739 "Rigid Polyvinyl Chloride Pipe Joints for Drainage." The inner and outer corners of the second elbow 64 in a plane including the pipe axis of the second elbow 64 are not rounded but are approximately right-angled.

[0061] The dimensions of the first elbow 63 and the second elbow 64 may be set in accordance with, for example, the standard JIS K 6739 "Rigid polyvinyl chloride pipe fittings for drainage." At least one of the first elbow 63 and the second elbow 64 may be a 90° bend elbow specified in JIS K 6739.

[0062] The auxiliary downspout 65 is a portion for vertically draining rainwater from the building 10 from the drop outlet 20a to the first elbow 63. The auxiliary downspout 65 is located between the drop outlet 20a and the first elbow 63. The auxiliary downspout 65 is a straight pipe. The cross section of the auxiliary downspout 65 perpendicular to its pipe axis is circular. The auxiliary downspout 65 is made of rigid polyvinyl chloride. The dimensions of the auxiliary downspout 65, such as its outer shape and thickness, may be set in accordance with the JIS K 6741 "Rigid Polyvinyl Chloride Pipe" standard for rigid polyvinyl chloride pipes (general). The auxiliary downspout 65 in FIG. 1 is disposed between the drop outlet 20a and the first elbow 63 so that the pipe axis of the auxiliary downspout 65 is aligned vertically. The auxiliary downspout 65 has an upstream end and a downstream end. The upstream end of the auxiliary downspout 65 is the end connected to the drop outlet 20a in the auxiliary downspout 65 (the upper end in FIG. 1). The downstream end of the auxiliary downspout 65 is the end connected to the first elbow 63 in the auxiliary downspout 65 (the lower end in FIG. 1).

[0063] [1.1.2 Effects, etc.] The eaves gutter 2 described above includes a bottom wall 20 and first and second side walls 21, 22 extending upward from both sides of the bottom wall 20 in the width direction. Let L1 be the length of a first straight line S1 connecting the upper end 21a and the lower end 21b of the first side wall 21, θ1 be the angle between the thickness direction of the bottom wall 20 and the first straight line S1, H1 be the height of the first side wall 21, L2 be the length of a second straight line S2 connecting the upper end 22a and the lower end 22b of the second side wall 22, θ2 be the angle between the thickness direction of the bottom wall 20 and the second straight line S2, H2 be the height of the second side wall 22, and W be the width of the bottom wall 20. The following relationships are satisfied: H1 = L1 cos θ1, H2 = L2 cos θ2, |θ1| ≤ 10°, |θ2| ≤ 10°, H1 ≥ H2, W ≥ 200 mm, and H2 ≥ 200 mm. This configuration can reduce degradation of drainage performance and the occurrence of overflow.

[0064] The eaves gutter 2 satisfies H2 / W≧0.5. This configuration can reduce the deterioration of drainage performance and the occurrence of overflow.

[0065] The eaves gutter 2 satisfies H2 / W≧2 / 3. This configuration can reduce the deterioration of drainage performance and the occurrence of overflow.

[0066] The eaves gutter 2 satisfies H2 / W≦2.5. This configuration can reduce the deterioration of drainage performance and the occurrence of overflow.

[0067] The eaves gutter 2 satisfies W≧240 mm. This configuration can reduce the deterioration of drainage performance and the occurrence of overflow.

[0068] The eaves gutter 2 satisfies W≧350 mm. This configuration can reduce the deterioration of drainage performance and the occurrence of overflow.

[0069] The eaves gutter 2 satisfies W≦450 mm. This configuration can reduce the deterioration of drainage performance and the occurrence of overflow.

[0070] The eaves gutter 2 satisfies W≦400 mm. This configuration can reduce the deterioration of drainage performance and the occurrence of overflow.

[0071] In the eaves gutter 2, θ1 satisfies θ1≧0°, with the positive direction being the direction in which the upper end 21a of the first side wall 21 moves away from the upper end 22a of the second side wall 22. This configuration can reduce the deterioration of drainage performance and the occurrence of overflow.

[0072] In the eaves gutter 2, θ2 satisfies θ2≧0°, with the positive direction being the direction in which the upper end 22a of the second side wall 22 moves away from the upper end 21a of the first side wall 21. This configuration can reduce deterioration of drainage performance and the occurrence of overflow.

[0073] In the eaves gutter 2, the bottom wall 20, the first side wall 21, and the second side wall 22 are integrally formed by extrusion molding of a resin material. This configuration eliminates the need to mold the eaves gutter 2 at the construction site, thereby improving workability.

[0074] The receiver 3 described above supports the eaves gutter 2. The eaves gutter 2 is located at the upper end 21a of the first side wall 21 and has a protruding portion 23 that protrudes inward of the eaves gutter 2. The receiver 3 has a support portion 30 that extends in the width direction of the bottom wall 20 of the eaves gutter 2 and supports the underside of the bottom wall 20, first and second arm portions 31, 32 that extend upward from both sides of the support portion 30, and a connecting portion 33 that is located on the first arm portion 31 and connects to the protruding portion 23 of the eaves gutter 2 from above. This configuration can reduce deformation of the eaves gutter 2, which can reduce deterioration of drainage performance and the occurrence of overflow.

[0075] In the receiver 3, the first arm 31 is formed from a metal plate 300. The connecting portion 33 is formed by bending a portion of the metal plate 300. This configuration simplifies the structure of the receiver 3 and allows for a reduction in manufacturing costs.

[0076] The receiving device 3 is located on the upper surface side of the bottom wall 20 of the eaves gutter 2 and further includes a connecting portion 34 that connects the first and second arm portions 31, 32. This configuration can reduce deformation of the eaves gutter 2.

[0077] The eaves gutter support structure 4 described above comprises the eaves gutter 2 and a receiving device 3 that supports the eaves gutter 2. The eaves gutter 2 is located at the upper end 21a of the first side wall 21 and has a protruding portion 23 that protrudes inward of the eaves gutter 2. The receiving device 3 comprises a support portion 30 that extends in the width direction of the bottom wall 20 of the eaves gutter 2 and supports the underside of the bottom wall 20, first and second arm portions 31, 32 that extend upward from both sides of the support portion 30, and a connecting portion 33 that is located on the first arm portion 31 and connects to the protruding portion 23 of the eaves gutter 2 from above. This configuration can reduce a decrease in drainage performance and the occurrence of overflow.

[0078] In the eaves gutter support structure 4, the bottom wall 20, first side wall 21, second side wall 22, and protrusion 23 are integrally formed by extrusion molding of a resin material. This configuration eliminates the need to mold the eaves gutter 2 at the construction site, improving workability.

[0079] 1.2 Second Embodiment [1.2.1 Configuration] Fig. 8 is a cross-sectional view of an example of the configuration of an eaves gutter support structure 4B according to this embodiment. The eaves gutter support structure 4A in Fig. 8 includes an eaves gutter 2A and a receiving member 3A.

[0080] The eaves gutter 2A includes a bottom wall 20, a first side wall 21, a second side wall 22, and a protrusion 23. In the eaves gutter 2A, the first side wall 21 and the second side wall 22 extend upward along the thickness direction of the bottom wall 20 from both sides in the width direction of the bottom wall 20.

[0081] Figure 9 is a cross-sectional view of the eaves gutter 2A. In the eaves gutter 2A of Figure 9, the length of the first straight line S1 connecting the upper end 21a and the lower end 21b of the first side wall 21 is L1, and the height of the first side wall 21 is H1. The eaves gutter 2A satisfies H1 = L1. In other words, the angle between the thickness direction of the bottom wall 20 and the first straight line S1 (the angle corresponding to θ1 shown in Figure 5) is 0°. In the eaves gutter 2A of Figure 9, the length L1 of the straight line S1 is equal to the width of the first side wall 21 (the dimension in the vertical direction in Figure 9).

[0082] In the eaves gutter 2A of Figure 9, the length of the second straight line S2 connecting the upper end 22a and the lower end 22b of the second side wall 22 is L2, and the height of the second side wall 22 is H2. The eaves gutter 2 satisfies H2 = L2. In other words, the angle between the thickness direction of the bottom wall 20 and the second straight line S2 (the angle corresponding to θ2 shown in Figure 5) is 0°. In the eaves gutter 2A of Figure 9, the length L2 of the straight line S2 is equal to the width of the second side wall 22 (the dimension in the vertical direction in Figure 9).

[0083] The eaves gutter 2A in Fig. 9 satisfies H1 ≥ H2. That is, the eaves gutter 2 satisfies L1 ≥ L2. In particular, in the eaves gutter 2A in Fig. 9, H1 > H2.

[0084] The eaves gutter 2A in FIG. 9 satisfies W≧200mm and H2≧200mm. It is preferable that the eaves gutter 2A satisfies W≧240mm. It is more preferable that the eaves gutter 2A satisfies W≧350mm. It is preferable that the eaves gutter 2A satisfies W≦450mm. It is more preferable that the eaves gutter 2A satisfies W≦400mm.

[0085] Regarding the relationship between H2 and W, the eaves gutter 2A preferably satisfies H2 / W≧0.5. The eaves gutter 2A more preferably satisfies H2 / W≧2 / 3. The eaves gutter 2A preferably satisfies H2 / W≦2.5.

[0086] The receiver 3A supports the eaves gutter 2A. The receiver 3A is used to install the eaves gutter 2A at the eaves edge of the roof 10a of the building 10. The receiver 3A comprises a support part 30, first and second arms 31, 32, a joining part 33, a connecting part 34, and a fixing part 35. In the receiver 3A, the first arm 31 and the second arm 32 extend upward from both sides of the support part 30 along the thickness direction of the support part 30.

[0087] [1.2.2 Effects, etc.] The eaves gutter 2A described above comprises a bottom wall 20 and first and second side walls 21, 22 extending upward from both sides in the width direction of the bottom wall 20. Let L1 be the length of a first straight line S1 connecting the upper end 21a and lower end 21b of the first side wall 21, H1 be the height of the first side wall 21, L2 be the length of a second straight line S2 connecting the upper end 22a and lower end 22b of the second side wall 22, H2 be the height of the second side wall 22, and W be the width of the bottom wall 20. The following relationships are satisfied: H1 = L1, H2 = L2, H1 ≥ H2, W ≥ 200 mm, and H2 ≥ 200 mm. This configuration can reduce degradation of drainage performance and the occurrence of overflow.

[0088] The receiver 3A described above supports the eaves gutter 2A. The eaves gutter 2A is located at the upper end 21a of the first side wall 21 and has a protruding portion 23 that protrudes inward of the eaves gutter 2A. The receiver 3A has a support portion 30 that extends in the width direction of the bottom wall 20 of the eaves gutter 2A and supports the underside of the bottom wall 20, first and second arms 31, 32 that extend upward from both sides of the support portion 30, and a connecting portion 33 that is located on the first arm 31 and connects to the protruding portion 23 of the eaves gutter 2A from above. This configuration can reduce deformation of the eaves gutter 2, which can reduce deterioration of drainage performance and the occurrence of overflow.

[0089] The eaves gutter support structure 4A described above comprises the eaves gutter 2A and a receiver 3A that supports the eaves gutter 2A. The eaves gutter 2A is located at the upper end 21a of the first side wall 21 and has a protruding portion 23 that protrudes inward of the eaves gutter 2A. The receiver 3A comprises a support portion 30 that extends in the width direction of the bottom wall 20 of the eaves gutter 2A and supports the underside of the bottom wall 20, first and second arms 31, 32 that extend upward from both sides of the support portion 30, and a connecting portion 33 that is located on the first arm 31 and connects to the protruding portion 23 of the eaves gutter 2A from above. This configuration can reduce deterioration of drainage performance and the occurrence of overflow.

[0090] 1.3 Third Embodiment 1.3.1 Configuration Fig. 10 is a cross-sectional view of an example of the configuration of an eaves gutter support structure 4B according to this embodiment. The eaves gutter support structure 4B in Fig. 10 includes an eaves gutter 2 and a receiving member 3B.

[0091] The receiver 3B of FIG. 10 includes a support portion 30, first and second arm portions 31 and 32, a joining portion 33B, a connecting portion , and a fixing portion .

[0092] The connecting portion 33B in Figure 10 is located on the first arm 31. The connecting portion 33B is configured to connect to the protruding portion 23 of the eaves gutter 2 from above. The connecting portion 33B in Figure 10 comprises a first piece 331 extending from the first arm 31 toward the second arm 32, a second piece 332 extending from the tip of the first piece 331 toward the support portion 30, and a detachment prevention piece 334 extending from the tip of the second piece 332 toward the support portion 30. The connecting portion 33B forms a recess 333 between the first arm 31 and the first piece 331 and the second piece 332. The recess 333 is sized so that the protruding portion 23 of the eaves gutter 2 fits into it.

[0093] The anti-detachment piece 334 restricts the movement of the protrusion 23 of the eaves gutter 2 so that it does not come off the connecting portion 33B. The anti-detachment piece 334 in FIG. 10 is elastic and partially protrudes toward the first side wall 21. The gap between the anti-detachment piece 334 and the first side wall 21 is narrower than the gap between the second piece 332 and the first side wall 21, thereby maintaining the protrusion 23 positioned within the recess 333 of the connecting portion 33B. Because the anti-detachment piece 334 is elastic, to remove the protrusion 23 from the connecting portion 33B, the anti-detachment piece 334 can be elastically deformed to widen the gap between the anti-detachment piece 334 and the first side wall 21. The anti-detachment piece 334 in FIG. 10 secures the protrusion 23 to the connecting portion 33B by a so-called snap fit.

[0094] [1.3.2 Effects, etc.] In the receiver 3B described above, the connecting portion 33B is provided with a detachment prevention piece 334 that limits the movement of the protruding portion 23 of the eaves gutter 2 so that the protruding portion 23 does not come off the connecting portion 33B. This configuration can reduce the possibility that the connection between the connecting portion 33 and the protruding portion 23 will come off unintentionally.

[0095] 1.4 Fourth embodiment 1.4.1 Configuration Fig. 11 is a cross-sectional view of an example of the configuration of an eaves gutter support structure 4C according to this embodiment. The eaves gutter support structure 4C in Fig. 11 includes an eaves gutter 2 and a receiving member 3C.

[0096] The receiver 3C of FIG. 11 includes a support portion 30, first and second arm portions 31 and 32, a joining portion 33C, a connecting portion , and a fixing portion .

[0097] The connecting portion 33C in Figure 11 is located on the first arm 31. The connecting portion 33C is configured to connect to the protruding portion 23 of the eaves gutter 2 from above. The connecting portion 33C in Figure 11 comprises a fixing piece 335 fixed to the first arm 31, a first piece 331 extending from the fixing piece 335 towards the second arm 32, and a second piece 332 extending from the tip of the first piece 331 towards the support portion 30. The first piece 331 and the second piece 332 form a recess 333 between the connecting portion 33C and the first arm 31. The recess 333 is sized so that the protruding portion 23 of the eaves gutter 2 can fit into it.

[0098] The receiver 3C in FIG. 11 is composed of three members: a first member 3a, a second member 3b, and a connecting portion 33C. The first member 3a, the second member 3b, and the connecting portion 33C are all formed from a metal material. The first member 3a in FIG. 11 includes a first arm 31 and a first portion 341 of the connecting portion 34. The first member 3a is formed by bending a metal plate. The metal plate has, for example, a substantially constant width and thickness in the length direction. The second member 3b in FIG. 11 includes a support portion 30, a second arm 32, a second portion 342 of the connecting portion 34, and a fixing portion 35. The second member 3b is formed by bending a metal plate. The metal plate has, for example, a substantially constant width and thickness in the length direction. The connecting portion 33C in FIG. 11 is formed by bending a metal plate.

[0099] Fig. 12 is a partial enlarged view of the receiver 3C. As shown in Fig. 12, the connecting portion 33C is fixed to the first arm portion 31 by welding. In this embodiment, the connecting portion 33C is fixed to the first arm portion 31 by welding the fixing piece 335 of the connecting portion 33C to the first arm portion 31. Spot welding can be used as a method for welding the fixing piece 335 of the connecting portion 33C to the first arm portion 31.

[0100] An example of the metal plate material used to form the first member 3a, the second member 3b, and the connecting portion 33C is a plated steel plate. The connecting portion 33C does not require as much strength as the first member 3a and the second member 3b. Therefore, the metal plate material used to form the connecting portion 33C may be thinner than the metal plate material used to form the first member 3a and the second member 3b. As an example, the thickness of the metal plate material used to form the first member 3a and the second member 3b is about 3 mm to 4 mm, and the thickness of the metal plate material used to form the connecting portion 33C is about 2 mm.

[0101] In this embodiment, the connecting portion 33C is a separate member and is not integrally formed with the first arm portion 31. Therefore, the connecting portion 33C can be designed independently of the first arm portion 31. This improves the degree of freedom in designing the connecting portion 33C.

[0102] [1.4.2 Effects, etc.] In the receiver 3C described above, the connecting portion 33C is fixed by welding to the first arm portion 31. This configuration can improve the degree of freedom in designing the connecting portion 33C.

[0103] 1.5 Fifth embodiment 1.5.1 Configuration Fig. 13 is a cross-sectional view of an example of the configuration of an eaves gutter support structure 4D according to this embodiment. The eaves gutter support structure 4D in Fig. 13 includes an eaves gutter 2 and a receiving member 3D.

[0104] The connecting portion 33D in Figure 13 is located on the first arm 31. The connecting portion 33D is configured to connect to the protruding portion 23 of the eaves gutter 2 from above. The connecting portion 33D in Figure 13 comprises an attachment piece 336 attached to the first arm 31, a first piece 331 extending from the attachment piece 336 towards the second arm 32, and a second piece 332 extending from the tip of the first piece 331 towards the support portion 30. The connecting portion 33D forms a recess 333 between the first arm 31 and the first piece 331 and the second piece 332. The recess 333 is sized so that the protruding portion 23 of the eaves gutter 2 can fit into it.

[0105] The receiver 3D in FIG. 13 is composed of three members: a first member 3a, a second member 3b, and a connecting portion 33D. The first member 3a, the second member 3b, and the connecting portion 33C are all formed from a metal material. The first member 3a in FIG. 13 includes a first arm 31 and a first portion 341 of the connecting portion 34. The first member 3a is formed by bending a metal plate. The metal plate has, for example, a substantially constant width and thickness in the length direction. The second member 3b in FIG. 13 includes a support portion 30, a second arm 32, a second portion 342 of the connecting portion 34, and a fixing portion 35. The second member 3b is formed by bending a metal plate. The metal plate has, for example, a substantially constant width and thickness in the length direction. The connecting portion 33D in FIG. 13 is formed by bending a metal plate.

[0106] 13 is attached to the first arm 31 by a connector 36. More specifically, the attachment piece 336 of the coupling part 33D is attached to the first arm 31 by the connector 36. In this embodiment, the connector 36 is made up of a wing nut and a bolt.

[0107] FIG. 14 is a partially enlarged view of the receiver 3D. As shown in FIG. 14, the coupling portion 33D is movable between a first position where it couples with the protrusion 23 and a second position where it does not couple with the protrusion 23. In FIG. 14, the coupling portion 33D in the first position is illustrated by a solid line, and the coupling portion 33D in the second position is illustrated by a two-dot chain line. As shown in FIG. 14, the coupling portion 33D is attached to the first arm 31 so as to be rotatable between the first position and the second position. The rotation axis of the coupling portion 33D is defined by the connector 36. That is, the coupling portion 33D is rotatable around the connector 36 between the first position and the second position. In other words, the connector 36 couples the coupling portion 33D to the first arm 31 so that the coupling portion 33D is rotatable between the first position and the second position relative to the first arm 31. An example of the connector 36 is a combination of a wing nut and a bolt, as described above, but there is no particular limitation as long as the connecting portion 33D can be connected to the first arm portion 31 so as to be rotatable between the first position and the second position.

[0108] In the eaves gutter support structure 4D of this embodiment, when attaching the eaves gutter 2 to the receiver 3D, the connecting portion 33D is positioned in the second position. After this, the bottom wall 20, first side wall 21, and second side wall 22 of the eaves gutter 2 are positioned so that they come into contact with the support portion 30, first arm portion 31, and second arm portion 32 of the receiver 3D, respectively. Next, the connecting portion 33D is moved from the second position to the first position, and the protruding portion 23 of the eaves gutter 2 is connected to the connecting portion 33D of the receiver 3D. This makes it possible to easily connect the connecting portion 33D and the protruding portion 23.

[0109] [1.5.2 Effects, etc.] In the receiver 3D described above, the coupling portion 33D is movable between a first position where it is coupled to the protrusion 23 and a second position where it is not coupled to the protrusion 23. This configuration makes it possible to easily couple the coupling portion 33D and the protrusion 23.

[0110] In the receiver 3D, the coupling portion 33D is attached to the first arm portion 31 so as to be rotatable between a first position and a second position. This configuration makes it possible to easily couple the coupling portion 33D and the protrusion 23.

[0111] 1.6 Sixth embodiment 1.6.1 Configuration Fig. 15 is a cross-sectional view of an example of the configuration of an eaves gutter support structure 4E according to this embodiment. The eaves gutter support structure 4E in Fig. 15 includes an eaves gutter 2E and a receiving member 3E.

[0112] Figure 16 is a cross-sectional view of the eaves gutter 2E. The eaves gutter 2E comprises a bottom wall 20, a first side wall 21, a second side wall 22, and a protrusion 23. In the eaves gutter 2E, the first side wall 21 and the second side wall 22 extend upward from both sides in the width direction of the bottom wall 20. The first side wall 21 and the second side wall 22 are plate-shaped having a length, width, and thickness. The first side wall 21 and the second side wall 22 are rectangular plate-shaped. In the length direction of the first side wall 21, the width and thickness of the first side wall 21 are approximately constant. In the length direction of the second side wall 22, the width and thickness of the second side wall 22 are approximately constant.

[0113] In this embodiment, the first side wall 21 and the second side wall 22 are curved in the width direction. The first side wall 21 is curved so that its widthwise center is located outside the eaves gutter 2E with respect to a first straight line S1 connecting the upper end 21a and the lower end 21b of the first side wall 21. The second side wall 22 is curved so that its widthwise center is located outside the eaves gutter 2E with respect to a second straight line S2 connecting the upper end 22a and the lower end 22b of the second side wall 22. In FIG. 16, the first straight line S1 is illustrated as being offset parallel to the upper end 21a and the lower end 21b for ease of viewing. The second straight line S2 is illustrated as being offset parallel to the upper end 22a and the lower end 22b.

[0114] In the eaves gutter 2E of Figure 16, the length of the first straight line S1 connecting the upper end 21a and lower end 21b of the first side wall 21 is defined as L1, the angle between the thickness direction of the bottom wall 20 and the first straight line S1 is defined as θ1, and the height of the first side wall 21 is defined as H1. The eaves gutter 2E satisfies H1 = L1 cos θ1. In the eaves gutter 2E of Figure 16, the length L1 of the straight line S1 is equal to the width of the first side wall 21.

[0115] In the eaves gutter 2E of Figure 16, the length of the second straight line S2 connecting the upper end 22a and the lower end 22b of the second side wall 22 is L2, the angle between the thickness direction of the bottom wall 20 and the second straight line S2 is θ2, and the height of the second side wall 22 is H2. The eaves gutter 2E satisfies H2 = L2 cos θ2. In the eaves gutter 2E of Figure 16, the length L2 of the straight line S2 is equal to the width of the second side wall 22.

[0116] The eaves gutter 2E in Figure 16 satisfies |θ1|≦10°. The positive direction of θ1 is the direction in which the upper end 21a of the first side wall 21 moves away from the upper end 22a of the second side wall 22 (counterclockwise direction in Figure 16). It is preferable that the eaves gutter 2E satisfies θ1≧0°.

[0117] The eaves gutter 2E in Fig. 16 satisfies |θ2|≦10°. The positive direction of θ2 is the direction in which the upper end 22a of the second side wall 22 moves away from the upper end 21a of the first side wall 21 (clockwise direction in Fig. 16). It is preferable that the eaves gutter 2E satisfies θ2≧0°.

[0118] The eaves gutter 2E in Fig. 16 satisfies H1 ≧ H2. That is, the eaves gutter 2E satisfies L1 cos θ1 ≧ L2 cos θ2. In particular, in the eaves gutter 2E in Fig. 16, H1 > H2.

[0119] The eaves gutter 2E in FIG. 16 satisfies W≧200mm and H2≧200mm. It is preferable that the eaves gutter 2E satisfies W≧240mm. It is more preferable that the eaves gutter 2E satisfies W≧350mm. It is preferable that the eaves gutter 2E satisfies W≦450mm. It is more preferable that the eaves gutter 2E satisfies W≦400mm.

[0120] Regarding the relationship between H2 and W, the eaves gutter 2E preferably satisfies H2 / W≧0.5. The eaves gutter 2E more preferably satisfies H2 / W≧2 / 3. The eaves gutter 2E preferably satisfies H2 / W≦2.5.

[0121] The receiver 3E supports the eaves gutter 2E. The receiver 3E is used to install the eaves gutter 2E at the eaves edge of the roof 10a of the building 10. The receiver 3E comprises a support portion 30, first and second arm portions 31, 32, a joining portion 33, a connecting portion 34, and a fixing portion 35. In the receiver 3E, the first arm portion 31 and the second arm portion 32 are curved to match the shapes of the first side wall 21 and the second side wall 22.

[0122] [1.6.2 Effects, etc.] The eaves gutter 2E described above includes a bottom wall 20 and first and second side walls 21, 22 extending upward from both sides in the width direction of the bottom wall 20. When the length of a first straight line S1 connecting the upper end 21a and the lower end 21b of the first side wall 21 is L1, the angle between the thickness direction of the bottom wall 20 and the first straight line S1 is θ1, the height of the first side wall 21 is H1, the length of a second straight line S2 connecting the upper end 22a and the lower end 22b of the second side wall 22 is L2, the angle between the thickness direction of the bottom wall 20 and the second straight line S2 is θ2, the height of the second side wall 22 is H2, and the width of the bottom wall 20 is W, the following relationships are satisfied: H1=L1cosθ1, H2=L2cosθ2, |θ1|≦10°, |θ2|≦10°, H1≧H2, W≧200 mm, and H2≧200 mm. This configuration can reduce the deterioration of drainage performance and the occurrence of overflow.

[0123] 1.7 Seventh embodiment 1.7.1 Configuration Fig. 17 is a cross-sectional view of an example of the configuration of an eaves gutter support structure 4F according to this embodiment. The eaves gutter support structure 4F in Fig. 17 includes an eaves gutter 2F and a receiving member 3F.

[0124] The eaves gutter 2F of FIG. 17 includes a bottom wall 20, a first side wall 21, a second side wall 22, a protruding portion (first protruding portion) 23, and a protruding portion (second protruding portion) 24.

[0125] The second protrusion 24 is located at the upper end 22a of the second side wall 22 and protrudes inward of the eaves gutter 2. The inside of the eaves gutter 2 is the direction from both sides in the width direction of the bottom wall 20 toward the center in the width direction of the bottom wall 20.

[0126] In this embodiment, the bottom wall 20, first side wall 21, second side wall 22, and protrusions 23, 24 are integrally formed. The bottom wall 20, first side wall 21, second side wall 22, and protrusions 23, 24 constitute the eaves gutter member 2a. The eaves gutter member 2a is formed, for example, by extrusion molding. The eaves gutter member 2a is formed mainly from a resin material. The eaves gutter member 2a may include a core material to reinforce the strength of the entire eaves gutter 2F. The core material may be made of, for example, metal.

[0127] The receiver 3F in FIG. 17 includes a support portion 30, first and second arm portions 31, 32, a connecting portion (first connecting portion) 33, a linking portion 34, a fixing portion 35, and a connecting portion (second connecting portion) 37.

[0128] The second connecting portion 37 is located on the second arm 32. The second connecting portion 37 is configured to connect to the second protruding portion 24 of the eaves gutter 2 from above. The second connecting portion 37 in FIG. 17 comprises a first piece 371 extending from the second arm 32 toward the first arm 31, and a second piece 372 extending from the tip of the first piece 371 toward the support portion 30. The first piece 371 and the second piece 372 form a recess 373 between the second connecting portion 37 and the second arm 32. The recess 373 is sized so that the second protruding portion 24 of the eaves gutter 2F fits into it.

[0129] The dimensions of the second connecting portion 37 can be set so that the second protrusion 24 does not come off the second connecting portion 37 during normal use of the gutter system, that is, so that the second protrusion 24 does not come out of the recess 373 of the second connecting portion 37. In the installation environment of the gutter system, the eaves gutter 2F may sway in the wind, and in such cases it is desirable that the second protrusion 24 does not come off the second connecting portion 37.

[0130] The receiver 3F in FIG. 17 is composed of two members: a first member 3a and a second member 3b. Both the first member 3a and the second member 3b are made of a metal material. The first member 3a in FIG. 17 includes a first arm portion 31, a first joining portion 33, and a first portion 341 of the connecting portion 34. The first member 3a is formed by bending a metal plate. The metal plate has, for example, a substantially constant width and thickness in the length direction.

[0131] The second member 3b in Fig. 17 includes the second arm 32, the second joint 37, and the second portion 342 of the connecting portion 34. The second member 3b is formed by bending a metal plate. The metal plate has, for example, a substantially constant width and thickness in the length direction. Therefore, the second arm 32, the second joint 37, and the second portion 342 of the connecting portion 34 are formed from the same metal plate.

[0132] The second joint 37 is formed by bending a portion of the metal plate that forms the second arm 32. In Fig. 17, the second joint 37 is formed by cutting and raising a portion of the center in the width direction of the metal plate. By forming the second joint 37, an opening 303 exists in the metal plate.

[0133] [1.7.2 Effects, etc.] The eaves gutter 2F described above includes a bottom wall 20 and first and second side walls 21, 22 extending upward from both sides in the width direction of the bottom wall 20. When the length of a first straight line S1 connecting the upper end 21a and the lower end 21b of the first side wall 21 is L1, the angle between the thickness direction of the bottom wall 20 and the first straight line S1 is θ1, the height of the first side wall 21 is H1, the length of a second straight line S2 connecting the upper end 22a and the lower end 22b of the second side wall 22 is L2, the angle between the thickness direction of the bottom wall 20 and the second straight line S2 is θ2, the height of the second side wall 22 is H2, and the width of the bottom wall 20 is W, the following relationships are satisfied: H1=L1cosθ1, H2=L2cosθ2, |θ1|≦10°, |θ2|≦10°, H1≧H2, W≧200 mm, and H2≧200 mm. This configuration can reduce the deterioration of drainage performance and the occurrence of overflow.

[0134] The above-described support member 3F supports the eaves gutter 2F. The eaves gutter 2F is provided with a first protrusion 23 located at the upper end 21a of the first side wall 21 and protruding inward of the eaves gutter 2F, and a second protrusion 24 located at the upper end 22a of the second side wall 22 and protruding inward of the eaves gutter 2F. The support member 3F includes a support member 30 extending in the width direction of the bottom wall 20 of the eaves gutter 2F and supporting the underside of the bottom wall 20, first and second arms 31 and 32 extending upward from both sides of the support member 30, a first connecting member 33 located on the first arm 31 and connecting to the first protrusion 23 of the eaves gutter 2F from above, and a second connecting member 37 located on the second arm 32 and connecting to the second protrusion 24 of the eaves gutter 2F from above. This configuration reduces deformation of the eaves gutter 2F, which reduces deterioration of drainage performance and the occurrence of overflow.

[0135] The above-described eaves gutter support structure 4F includes an eaves gutter 2F and a receiving member 3F that supports the eaves gutter 2F. The eaves gutter 2F includes a bottom wall 20 and first and second side walls 21, 22 that extend upward from both sides of the bottom wall 20 in the width direction. Let L1 be the length of the first straight line S1 connecting the upper end 21a and the lower end 21b of the first side wall 21, θ1 be the angle between the thickness direction of the bottom wall 20 and the first straight line S1, H1 be the height of the first side wall 21, L2 be the length of the second straight line S2 connecting the upper end 22a and the lower end 22b of the second side wall 22, θ2 be the angle between the thickness direction of the bottom wall 20 and the second straight line S2, H2 be the height of the second side wall 22, and W be the width of the bottom wall 20. Then, H1=L1cosθ1, H2=L2cosθ2, |θ1|≦10°, |θ2|≦10°, H1≧H2, W≧200mm, and H2≧200mm are satisfied. The eaves gutter 2F has a first protrusion 23 located at the upper end 21a of the first side wall 21 and protruding inward of the eaves gutter 2F, and a second protrusion 24 located at the upper end 22a of the second side wall 22 and protruding inward of the eaves gutter 2F. The receiver 3F has a support portion 30 extending in the width direction of the bottom wall 20 of the eaves gutter 2F and supporting the underside of the bottom wall 20, first and second arms 31, 32 extending upward from both sides of the support portion 30, a first connecting portion 33 located on the first arm 31 and connecting to the first protrusion 23 of the eaves gutter 2F from above, and a second connecting portion 37 located on the second arm 32 and connecting to the second protrusion 24 of the eaves gutter 2F from above. This configuration can reduce deterioration of drainage performance and the occurrence of overflow.

[0136] [2. Modifications] The embodiments of the present disclosure are not limited to the above-described embodiments. The above-described embodiments can be modified in various ways depending on the design, etc., as long as the object of the present disclosure can be achieved. Modifications of the above-described embodiments are listed below. The modifications described below can be applied in appropriate combinations.

[0137] In one variant, the eaves gutter 2 may have at least one of a protrusion 23 located at the upper end 21a of the first side wall 21 and protruding inwardly of the eaves gutter 2, and a protrusion 24 located at the upper end 22a of the second side wall 22 and protruding inwardly of the eaves gutter 2. The receiver 3 may have at least one of a connecting portion 33 located on the first arm 31 and connecting to the protrusion 23 of the eaves gutter 2 from above, and a connecting portion 37 located on the second arm 32 and connecting to the protrusion 24 of the eaves gutter 2 from above.

[0138] In one variation, the connecting portion 37 may have a detachment prevention piece similar to the detachment prevention piece 334 of the connecting portion 33B. The connecting portion 37 may be fixed to the second arm portion 32 by welding. The connecting portion 37 may be movable between a first position where it connects with the protrusion 24 and a second position where it does not connect with the protrusion 24. In this case, the connecting portion 37 may be attached to the second arm portion 32 so as to be rotatable between the first position and the second position.

[0139] In one modified example, the protrusion 23 is not necessarily limited to protruding inward of the eaves gutter 2, but may be configured to protrude on at least one of the outside and inside of the eaves gutter 2. The protrusion 24 is not necessarily limited to protruding inward of the eaves gutter 2, but may be configured to protrude on at least one of the outside and inside of the eaves gutter 2.

[0140] In one modified example, the protrusions 23, 24 are not limited to a substantially U-shaped shape in a plane perpendicular to the longitudinal direction of the bottom wall 20 of the eaves gutter 2. The protrusions 23, 24 may have any shape as long as they can be connected to the connecting portions 33, 37 of the receiver 3.

[0141] In one modified example, the eaves gutter 2 does not necessarily have to have either the protrusion 23 or the protrusion 24. However, if the eaves gutter 2 has at least one of the protrusions 23 or the protrusion 24, it can be attached to the roof 10a using the receiving device 3.

[0142] In one modified example, the shapes of the first side wall 21 and the second side wall 22 of the eaves gutter 2 are not particularly limited. As an example, the first side wall 21 may be curved so that the center in the width direction is located more inward of the eaves gutter 2 than a first straight line S1 connecting the upper end 21a and the lower end 21b of the first side wall 21. The second side wall 22 may be curved so that the center in the width direction is located more inward of the eaves gutter 2 than a second straight line S2 connecting the upper end 22a and the lower end 22b of the second side wall 22.

[0143] In one modified example, the eaves gutter 2 may include a plurality of eaves gutter members 2a. In this case, a drop opening 20a may be formed in at least one of the plurality of eaves gutter members 2a.

[0144] [3. Aspects] As is clear from the above-described embodiments and modifications, the present disclosure includes the following aspects. In the following, reference numerals are given in parentheses only to clarify the correspondence with the embodiments. Note that, in consideration of readability of the text, the reference numerals in parentheses may be omitted from the second and subsequent times.

[0145] The first aspect is an eaves gutter (2; 2A; 2E; 2F) comprising a bottom wall (20) and first and second side walls (21, 22) extending upward from both sides in the width direction of the bottom wall (20). Let L1 be the length of a first straight line (S1) connecting the upper end (21a) and lower end (21b) of the first side wall (21), θ1 be the angle between the thickness direction of the bottom wall (20) and the first straight line (S1), H1 be the height of the first side wall (21), L2 be the length of a second straight line (S2) connecting the upper end (22a) and lower end (22b) of the second side wall (22), θ2 be the angle between the thickness direction of the bottom wall (20) and the second straight line (S2), H2 be the height of the second side wall (22), and W be the width of the bottom wall (20). The following relationships are satisfied: H1 = L1 cos θ1, H2 = L2 cos θ2, |θ1| ≦ 10°, |θ2| ≦ 10°, H1 ≧ H2, W ≧ 200 mm, and H2 ≧ 200 mm. This embodiment can reduce the deterioration of drainage performance and the occurrence of overflow.

[0146] The second aspect is an eaves gutter (2; 2A; 2E; 2F) based on the first aspect. In the second aspect, H2 / W≧0.5 is satisfied. This aspect can reduce the deterioration of drainage performance and the occurrence of overflow.

[0147] The third aspect is an eaves gutter (2; 2A; 2E; 2F) based on the first or second aspect. In the third aspect, H2 / W≧2 / 3 is satisfied. This aspect can reduce the deterioration of drainage performance and the occurrence of overflow.

[0148] The fourth aspect is an eaves gutter (2; 2A; 2E; 2F) based on any one of the first to third aspects. In the fourth aspect, H2 / W≦2.5 is satisfied. This aspect can reduce the deterioration of drainage performance and the occurrence of overflow.

[0149] The fifth aspect is an eaves gutter (2; 2A; 2E; 2F) based on any one of the first to fourth aspects. In the fifth aspect, W≧240 mm is satisfied. This aspect can reduce the deterioration of drainage performance and the occurrence of overflow.

[0150] The sixth aspect is an eaves gutter (2; 2A; 2E; 2F) based on any one of the first to fifth aspects. In the sixth aspect, W≧350 mm is satisfied. This aspect can reduce the deterioration of drainage performance and the occurrence of overflow.

[0151] The seventh aspect is an eaves gutter (2; 2A; 2E; 2F) based on any one of the first to sixth aspects. In the seventh aspect, W≦450 mm is satisfied. This aspect can reduce the deterioration of drainage performance and the occurrence of overflow.

[0152] The eighth aspect is an eaves gutter (2; 2A; 2E; 2F) based on any one of the first to seventh aspects. In the eighth aspect, W≦400 mm is satisfied. This aspect can reduce the deterioration of drainage performance and the occurrence of overflow.

[0153] The ninth aspect is an eaves gutter (2; 2A; 2E; 2F) based on any one of the first to eighth aspects. In the ninth aspect, θ1 satisfies θ1≧0°, with the positive direction being the direction in which the upper end (21a) of the first side wall (21) moves away from the upper end (22a) of the second side wall (22). This aspect can reduce the deterioration of drainage performance and the occurrence of overflow.

[0154] A tenth aspect is an eaves gutter (2; 2A; 2E; 2F) based on any one of the first to ninth aspects. In the tenth aspect, θ2 satisfies θ2≧0°, with the positive direction being the direction in which the upper end (22a) of the second side wall (22) moves away from the upper end (21a) of the first side wall (21). This aspect can reduce the deterioration of drainage performance and the occurrence of overflow.

[0155] The eleventh aspect is the eaves gutter (2; 2A; 2E; 2F) based on any one of the first to tenth aspects. In the eleventh aspect, the bottom wall (20), the first side wall (21), and the second side wall (22) are integrally formed by extrusion molding of a resin material. This aspect eliminates the need to mold the eaves gutter (2; 2A; 2E; 2F) at the construction site, thereby improving workability.

[0156] A twelfth aspect is a receiving device (3; 3A-3F) for supporting an eaves gutter (2; 2A; 2E; 2F) based on any one of the first to eleventh aspects. The eaves gutter (2; 2A; 2E; 2F) is located at least one of the upper end (21a) of the first side wall (21) and the upper end (22a) of the second side wall (22), and has protrusions (23, 24) that protrude toward at least one of the outer side and the inner side of the eaves gutter (2; 2A; 2E; 2F). The receiving device (3; 3A-3F) comprises a support portion (30) extending in the width direction of the bottom wall (20) of the eaves gutter (2; 2A; 2E; 2F) and supporting the underside of the bottom wall (20), first and second arm portions (31, 32) extending upward from both sides of the support portion (30), and a connecting portion (33; 33B-33D, 37) located on at least one of the first arm portion (31) and the second arm portion (32) and connecting to the protruding portion (23, 24) of the eaves gutter (2; 2A; 2E; 2F) from above. This aspect can reduce deformation of the eaves gutter (2; 2A; 2E; 2F), which can reduce deterioration of drainage performance and the occurrence of overflow.

[0157] A thirteenth aspect is a receiver (3; 3A; 3B; 3E; 3F) based on the twelfth aspect. In the thirteenth aspect, one of the first arm portion (31) and the second arm portion (32) is formed from a metal plate (300). The connecting portion (33; 33B-33D, 37) is formed by bending a portion of the metal plate (300). This aspect simplifies the structure of the receiver (3; 3A; 3B; 3E; 3F) and enables reduction in manufacturing costs.

[0158] A fourteenth aspect is a receiver (3C) based on the twelfth aspect. In the fourteenth aspect, the connecting portion (33C) is fixed to one of the first arm portion (31) and the second arm portion (32) by welding. This aspect can improve the degree of freedom in designing the connecting portion (33C).

[0159] A fifteenth aspect is a receiver (3D) based on the twelfth aspect. In the fifteenth aspect, the coupling portion (33D) is movable between a first position where it couples with the protrusion (23) and a second position where it does not couple with the protrusion (23). This aspect makes it possible to easily couple the coupling portion (33D) with the protrusion (23).

[0160] A sixteenth aspect is the receiver (3D) based on the fifteenth aspect. In the sixteenth aspect, the coupling portion (33D) is attached to one of the first arm portion (31) and the second arm portion (32) so as to be rotatable between the first position and the second position. This aspect makes it possible to easily couple the coupling portion (33D) and the protrusion (23).

[0161] A seventeenth aspect is a receiving device (3; 3A-3F) based on the twelfth aspect. In the seventeenth aspect, the receiving device (3; 3A-3F) further includes a connecting portion (34) located on the upper surface side of the bottom wall (20) of the eaves gutter (2; 2A; 2E; 2F) and connecting the first and second arm portions (31, 32) to each other. This aspect can reduce deformation of the eaves gutter (2; 2A; 2E; 2F).

[0162] The eighteenth aspect is an eaves gutter support structure (4; 4A-4F) comprising an eaves gutter (2; 2A; 2E; 2F) based on any one of the first to eleventh aspects and a receiving device (3; 3A-3F) that supports the eaves gutter (2; 2A; 2E; 2F). The eaves gutter (2; 2A; 2E; 2F) is located at either the upper end (21a) of the first side wall (21) or the upper end (22a) of the second side wall (22), and comprises protrusions (23, 24) that protrude to at least one of the outside and inside of the eaves gutter (2; 2A; 2E; 2F). The receiving device (3; 3A-3F) comprises a support portion (30) extending in the width direction of the bottom wall (20) of the eaves gutter (2; 2A; 2E; 2F) and supporting the underside of the bottom wall (20), first and second arm portions (31, 32) extending upward from both sides of the support portion (30), and a connecting portion (33; 33B-33D, 37) located on one of the first arm portion (31) and the second arm portion (32) and connecting to the protruding portion (23, 24) of the eaves gutter (2; 2A-2F) from above. This aspect can reduce deterioration of drainage performance and the occurrence of overflow.

[0163] The 19th aspect is an eaves gutter support structure (4; 4A-4F) based on the 18th aspect. In the 19th aspect, the protrusion (23) is located at the upper end (21a) of the first side wall (21) and protrudes inward of the eaves gutter (2; 2A; 2E; 2F). The connecting portion (33; 33B-33D) is located on the first arm portion (31) and connects to the protrusion (23) from above. This aspect can reduce deterioration of drainage performance and the occurrence of overflow.

[0164] The twentieth aspect is an eaves gutter support structure (4; 4A-4F) based on the eighteenth or nineteenth aspect. In the twentieth aspect, the bottom wall (20), the first side wall (21), the second side wall (22), and the protrusion (23) are integrally formed by extrusion molding of a resin material. This aspect eliminates the need to mold the eaves gutters (2; 2A; 2E; 2F) at the construction site, thereby improving workability.

[0165] The above 13th to 17th aspects can be appropriately modified and applied to aspect 18. The above 2nd to 11th, 13th to 17th, 19th and 20th aspects are optional elements. [Industrial Applicability]

[0166] The present disclosure is applicable to a piping member and a gutter system. Specifically, the present disclosure is applicable to a piping member that constitutes a part of a piping system having an elbow that connects a first pipe extending horizontally and a second pipe extending vertically, and to a gutter system for draining rainwater. [Explanation of symbols]

[0167] 1. Gutter system 2,2A,2E,2F Eaves gutter 20 Bottom Wall 21 First side wall 21a top end 21b Bottom end 22 Second side wall 22a top end 22b Bottom end 23 Protrusion 24 Protrusion 3,3A,3B,3C,3D,3E,3F Receiver 30 Support part 31 1st arm 32 2nd arm 33,33B,33C,33D joint part 34 Connecting part 37 Joint 300 Metal Plates 4,4A,4B,4C,4D,4E,4F Eave gutter support structure

Claims

1. The bottom wall and first and second side walls extending linearly upward from both sides of the bottom wall in the width direction; a protruding portion located at one of an upper end of the first side wall and an upper end of the second side wall and protruding outward from the eaves gutter; Equipped with the first side wall and the second side wall are plate-shaped and have a length, a width, and a thickness; The width and thickness of the first side wall are substantially constant in a longitudinal direction of the first side wall, The width and thickness of the second side wall are substantially constant in the length direction of the second side wall, The bottom wall, the first side wall, the second side wall, and the protrusion are The length of a first straight line connecting the upper end and the lower end of the first side wall is L1, an angle between the thickness direction of the bottom wall and the first line, with the direction in which the upper end of the first side wall moves away from the upper end of the second side wall being a positive direction, being θ1; The height of the first side wall is H1, The length of the second straight line connecting the upper end and the lower end of the second side wall is L2. an angle between the thickness direction of the bottom wall and the second line, with the direction in which the upper end of the second side wall moves away from the upper end of the first side wall being a positive direction, being θ2; The height of the second side wall is H2, If the width of the bottom wall is W, H1=L1cosθ1, H2=L2cosθ2, 0°<θ1≦10°, 0°<θ2≦10°, H1 ≥ H2, W≧200 mm, H2≧200mm, The molded article is integrally formed by extrusion molding of a resin material so as to have a predetermined shape that satisfies the above. Eaves gutter.

2. H2 / W≧0.5 is satisfied; The eaves gutter according to claim 1.

3. H2 / W≧2 / 3 is satisfied. The eaves gutter according to claim 1.

4. H2 / W≦2.5 is satisfied; The eaves gutter according to claim 1.

5. W≧240 mm is satisfied. The eaves gutter according to claim 1.

6. W≧350 mm is satisfied. The eaves gutter according to claim 1.

7. W≦450 mm is satisfied. The eaves gutter according to claim 1.

8. W≦400 mm is satisfied. The eaves gutter according to claim 1.

9. A core material is provided to reinforce the strength of the entire eaves gutter. The eaves gutter according to claim 1.

10. an eave gutter member that is composed of the bottom wall, the first side wall, the second side wall, and the protrusion, and has openings on both sides of the bottom wall in a longitudinal direction; end members fixed to both ends of the bottom wall of the eaves gutter member in the longitudinal direction; Equipped with The eaves gutter according to claim 1.

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