Rainwater storage structure

Abstract

To provide a rainwater storage structure with high seismic resistance. [Solution] The rainwater storage member 3 has a base plate 5 and a plurality of columnar parts 7 that stand upright on the base plate 5. The reinforcing member 15 is composed of a plurality of reinforcing parts and connecting parts that connect the reinforcing parts to each other. The reinforcing parts are ring-shaped and have holes that penetrate vertically. Multiple rainwater storage members 3 are arranged side by side in a horizontal direction. The reinforcing member 15 is positioned so as to span the four divided sections of each rainwater storage member 3, with the intersection of the boundary lines of the four rainwater storage members 3 as the center.

Description

Technical Field

[0001] The present invention relates to a rainwater storage structure in a rainwater storage tank for storing rainwater underground.

Background Art

[0002] In recent years, in order to prevent flood damage against sudden heavy rain and the like, a storage tank for rainwater and the like that temporarily stores rainwater and the like underground is used. According to the rainwater storage tank, the stored rainwater can be gradually infiltrated into the ground layer, or once the stored large amount of rainwater can be discharged into a river or the like over a sufficient period of time, or the stored rainwater can be pumped up and used as fire prevention water or the like. The rainwater storage structure constituting such a rainwater storage tank needs to support the upper soil cover and the loads of people and vehicles passing above. Therefore, the rainwater storage structure is formed by stacking a plurality of rainwater storage members capable of supporting the load from above.

[0003] In general, such a rainwater storage member is composed of a flat plate-shaped substrate portion and a plurality of column bodies standing on the substrate portion. At this time, considering the manufacturing cost and handling property, the substrate portion and the column bodies are integrally formed with resin or the like, and by abutting and stacking the column bodies of the plurality of rainwater storage members together, a rainwater storage structure having a predetermined height (depth) can be formed (for example, Patent Documents 1 and 2).

[0004] On the other hand, the tips of the column bodies are usually only fitted together with concave and convex portions or the like. Further, since the rainwater storage members are integrally formed with resin, the column bodies often have a tapered shape in which the diameter becomes thinner toward the tip for the sake of the draft from the mold during manufacturing and the efficiency during transportation and storage. Therefore, when a load is applied to the rainwater storage member in the vertical direction, the abutting portion of the column bodies may be deformed and buckling failure may occur.

[0005] On the other hand, a method has been proposed in which a reinforcing member is arranged at the opposing portions of the rainwater storage members, and the rainwater storage members are laminated by the reinforcing member (Patent Document 3).

Prior Art Documents

[0006] [Patent Document 1] Japanese Patent Publication No. 2012-052349 [Patent Document 2] Japanese Patent Publication No. 2010-209604 [Patent Document 3] Japanese Patent Publication No. 2024-117603 [Overview of the project] [Problems that the invention aims to solve]

[0007] However, even with methods using reinforcing members, as described in Patent Document 3, the effect of suppressing displacement between rainwater storage members against horizontal forces is small. For example, since rainwater storage members installed side-by-side horizontally transmit horizontal forces only through contact between the sides of their substrates, the shear strength and shear rigidity of the rainwater storage structure are insufficient, resulting in a problem of low seismic performance.

[0008] This invention has been made in view of these problems, and aims to provide a rainwater storage structure with high seismic resistance. [Means for solving the problem]

[0009] To achieve the aforementioned objectives, the present invention provides a rainwater storage structure comprising a plurality of rainwater storage members stacked together, wherein each rainwater storage member has a base plate and a plurality of column portions standing upright on the base plate, the plurality of rainwater storage members are arranged horizontally side by side, the lower rainwater storage member and the upper rainwater storage member are stacked so that the tips of the column portions of the lower rainwater storage member and the upper rainwater storage member face each other, a reinforcing member having a plurality of reinforcing portions that reinforce the opposing portions of the column portions is arranged at the opposing portions of the column portions, and the reinforcing member is arranged to span across the plurality of rainwater storage members arranged horizontally side by side.

[0010] The upper and lower rainwater storage members may be arranged facing each other at the same position in the vertical direction.

[0011] The reinforcing member may have the same number of reinforcing parts as the column portion of the rainwater storage member, and the reinforcing member may be positioned horizontally offset from the rainwater storage member.

[0012] At least some of the adjacent column portions on the substrate are arranged at the same pitch P1, and when the rainwater storage members are installed horizontally, the pitch P2 between adjacent column portions spanning adjacent rainwater storage members is different from the pitch P1, and at least some of the reinforcing portions of the reinforcing member may be arranged at the pitch P1, and other parts may be arranged at the pitch P2.

[0013] The reinforcing portion of the reinforcing member may be ring-shaped, and the butt portions of the column portions may be inserted into the reinforcing portion, with the tips of the column portions in contact with each other and stacked.

[0014] The reinforcing members are arranged so as to span the four adjacent rainwater storage members, offset by half a pitch in each of the mutually orthogonal horizontal directions, and the reinforcing members do not need to be placed on a portion of the column on the outer circumference side of the rainwater storage member located on the outermost periphery.

[0015] According to the present invention, by arranging a reinforcing member so as to span across multiple rainwater storage members arranged horizontally, the horizontal forces between the horizontally arranged rainwater storage members are transmitted through the reinforcing member. This increases the rigidity of the rainwater storage structure and improves its seismic resistance. In this case, since it is not necessary to connect the base plates of the adjacent rainwater storage members, construction is easy.

[0016] Furthermore, the rainwater storage members, which are stacked vertically, are positioned opposite each other at the same vertical position, and only the reinforcing members are positioned horizontally offset from the rainwater storage members, making the placement of the rainwater storage members easy. Therefore, errors in the placement of the rainwater storage members when stacking them are less likely to occur.

[0017] Furthermore, by ensuring that at least some adjacent column sections on the substrate are arranged at the same pitch P1, and that the pitch P2 between adjacent column sections spanning other adjacent rainwater storage members is different from pitch P1, it is possible to suppress the incorrect placement of reinforcing members. For example, in a plan view, if the intention is to place the reinforcing members with a 1 / 2 pitch offset in both the vertical and horizontal directions relative to the rainwater storage member, but they are mistakenly placed at a position shifted by 1 / 4 pitch, the incorrect placement can be detected because the position of the reinforcing member and the position of the column section will not match.

[0018] Furthermore, by making the reinforcing portion of the strong member ring-shaped, and by having the abutting portion of the column insert into the reinforcing portion, the tips of the column portions can be in contact with each other and stacked, making it possible to keep the stacking height of the rainwater storage members constant regardless of the presence or absence of the reinforcing member.

[0019] If we place rainwater storage members around almost the entire surface of the rainwater storage tank, and then place reinforcing members of the same size across the four adjacent rainwater storage members, offset by half a pitch in each of the mutually orthogonal horizontal directions, then a portion of half a pitch will be left without reinforcing members at the outermost perimeter. In other words, no reinforcing members will be placed around the outermost rainwater storage members, while reinforcing members will be placed in their central portions. Similarly, if the rainwater storage tank is not a perfect rectangle in plan view, a portion of the tank will also be left without reinforcing members of the same size.

[0020] In this case, the outermost rainwater storage member is restrained by the inner surface of the rainwater storage tank, resulting in higher rigidity compared to the central area, and thus allowing for the omission of reinforcing members. Therefore, compared to the case where reinforcing members of different shapes are prepared and installed on the columns of all rainwater storage members, the number of parts and installation work can be reduced. In this case, there will be a mix of areas with and without reinforcing members, but in all areas the tips of the columns are in contact with each other, and since no reinforcing members are sandwiched in the gaps between the columns, the height can be kept constant. [Effects of the Invention]

[0021] According to the present invention, a rainwater storage structure with high seismic performance can be provided.

Brief Description of the Drawings

[0022] [Figure 1] Perspective view of the rainwater storage member 3. [Figure 2] (a) is a plan view of the rainwater storage member 3, and (b) is a cross-sectional view taken along line A-A of (a). [Figure 3] (a) is a cross-sectional view showing a state in which the rainwater storage members 3 are stacked facing each other, and (b) is an enlarged view of part D of (a). [Figure 4] (a) is a perspective view of the reinforcing member 15, and (b) is a plan view of the reinforcing member 15. [Figure 5] (a) is a plan view showing a state in which a plurality of rainwater storage members 3 are provided side by side, and (b) is a plan view showing a state in which the reinforcing member 15 is further arranged. [Figure 6] (a) is a cross-sectional view of a state in which the rainwater storage members 3 are further arranged facing each other above FIG. 5(b), and (b) is an enlarged view of part G of (a). [Figure 7] Schematic view showing the rainwater storage structure 1. [Figure 8] View showing the rainwater storage member 3a.

Modes for Carrying Out the Invention

[0023] Hereinafter, the rainwater storage structure according to an embodiment of the present invention will be described. FIG. 1 is a perspective view showing the rainwater storage member 3 constituting the rainwater storage structure, FIG. 2(a) is a plan view, and FIG. 2(b) is a cross-sectional view taken along line A-A of FIG. 2(a).

[0024] The rainwater storage member 3 has a substrate 5 and a plurality of column portions 7 standing on the substrate 5. The substrate 5 is a plate-shaped member. In the illustrated example, the substrate 5 is provided with a total of 16 column portions 7 of 4×4, but as long as a plurality of column portions 7 are provided for one substrate 5, for example, if there are a plurality of four or more, the number is not limited.

[0025] Furthermore, although the substrate 5 is shown as a flat plate, it may have, for example, multiple holes through which rainwater can flow, or ribs to improve strength. Even with such a complex shape, the rainwater storage member 3 can be easily manufactured, for example, by injection molding of a polyolefin-based resin.

[0026] The column section 7 is formed such that, for example, its diameter becomes smaller towards the tip. This makes it possible to stack the rainwater storage members 3 (the column sections 7) facing the same direction.

[0027] In the illustrated example, the cross-section of the column portion 7 is circular, but it may be rectangular or any other polygon. A convex portion 9 or a concave portion 11 is provided at the top of each column portion 7. As mentioned above, the outer diameter of the column portion 7 tapers (without a step) from the base plate 5 side, but a reduced diameter portion 13 is formed near the tip of the column portion 7, where the diameter decreases via a step. The convex portion 9 is provided so as to protrude from the tip side of the reduced diameter portion 13, and the concave portion 11 is formed inside the reduced diameter portion 13.

[0028] As shown in Figure 2(a), when the rainwater storage member 3 is divided into four sections by mutually orthogonal centerlines B and C in a plan view, sections in which a convex portion 9 is formed at the tip of the column portion 7 and sections in which a concave portion 11 is formed are arranged diagonally. For example, in the upper right and lower left sections of Figure 2(a), concave portions 11 are formed at the tips of all four column portions 7, and convex portions 9 are formed at the tips of all four column portions 7 in the upper left and lower right sections.

[0029] In this way, the rainwater storage members 3 can be stacked on top of each other, and when the rainwater storage members 3 are stacked together as described later, the convex portion 9 and the concave portion 11 can be positioned facing each other. As mentioned above, the number of column portions 7 of the rainwater storage member 3 is not limited, but when it is divided into four sections, it is desirable that multiple column portions 7 be arranged in each section.

[0030] In the illustrated example, the four column sections 7 in each of the four sections are arranged at a pitch P1. That is, within the same section, the centers of the four column sections 7 form an approximate square. On the other hand, the column sections 7 that span adjacent sections are arranged at a pitch P2. In the illustrated example, they are arranged at different pitches such that P1 > P2. Note that all column sections 7 may be arranged at a pitch of P1 regardless of the section.

[0031] Figure 3(a) is a cross-sectional view showing a state in which a pair of rainwater storage members 3 are stacked facing each other, and Figure 3(b) is an enlarged view of section D in Figure 3(a). The lower rainwater storage member 3 and the upper rainwater storage member 3 are stacked so that the tips of their respective column portions 7 face each other. In this case, one tip of the opposing column portion 7 is a convex portion 9 and the other is a concave portion 11. Therefore, by arranging the pair of rainwater storage members 3 facing each other so that their column portions 7 abut each other, and fitting their respective convex portions 9 and concave portions 11 together, the rainwater storage members 3 can be stacked and connected. Note that the fitting structure of the column portions 7 is not limited to the convex portion 9 and concave portion 11 shown in the figure. As long as it has a function of preventing slippage when the tops of the column portions 7 are abutted and stacked together, the form is not particularly limited.

[0032] In this case, the edge of the recess 11 (the tip of the column portion 7) comes into contact with the base of the convex portion 9 (the stepped surface between the reduced diameter portion 13 and the convex portion 9). That is, when two rainwater storage members 3 are placed facing each other, the tips of the column portions 7 come into contact with each other, and the rainwater storage members 3 are stacked on top of each other. In addition, the reduced diameter portions 13 of the opposing column portions 7 are arranged to be continuous vertically. That is, the reduced diameter portions 13 are formed on the outer circumference of the fitting portion between the column portions 7.

[0033] Next, the reinforcing members that constitute the rainwater storage structure will be described. Figure 4(a) is a perspective view showing the reinforcing member 15, and Figure 4(b) is a plan view of the reinforcing member 15. The reinforcing member 15 is composed of a plurality of reinforcing parts 17 and connecting parts 19 that connect the reinforcing parts 17 to each other. The reinforcing parts 17 are ring-shaped and have holes that penetrate vertically. The reinforcing member 15 has the same number of reinforcing parts 17 as the column parts 7 of the rainwater storage member 3. That is, in the illustrated example, there are 16 reinforcing parts 17 in a 4x4 arrangement. In addition, including the connecting parts 19, the reinforcing member 15 has gaps that allow water to flow vertically.

[0034] Here, as shown in Figure 4(b), when the reinforcing member 15 is divided into four sections by mutually orthogonal centerlines E and F in a plan view, the four reinforcing sections 17 within each section are arranged at a pitch P1. That is, connecting the centers of the four reinforcing sections 17 forms an approximate square. On the other hand, the reinforcing sections 17 that span adjacent sections are arranged at a pitch P2. In the illustrated example, they are arranged at different pitches such that P1 > P2. That is, at least a portion of the reinforcing sections 17 of the reinforcing member 15 are arranged at a pitch P1, and the other portion are arranged at a pitch P2, in the same arrangement as the column section 7 in the rainwater storage member 3.

[0035] Next, a rainwater storage structure using rainwater storage members 3 and reinforcing members 15 will be described. First, as shown in Figure 5(a), multiple rainwater storage members 3 are arranged horizontally. In the illustrated example, four rainwater storage members 3 are arranged in pairs vertically and horizontally in a plan view.

[0036] As mentioned above, in the same rainwater storage member 3, when it is divided into four sections, the pitch of the column sections 7 in each section is P1. That is, at least some of the adjacent column sections 7 on the base plate 5 are arranged at the same pitch P1. On the other hand, when the rainwater storage members 3 are placed side by side horizontally, the adjacent column sections 7 that span across adjacent rainwater storage members 3 are arranged at a pitch P2 (a different pitch from P1). That is, in a plan view, the distance between the center of the outermost column section 7 of the rainwater storage member 3 and the nearest edge is P2 / 2.

[0037] In this way, as shown in Figure 5(b), the reinforcing member 15 can be positioned to span across the four rainwater storage members 3. That is, the reinforcing member 15 is positioned to span across each of the four divided sections of each rainwater storage member 3, with the intersection of the boundary lines between the four rainwater storage members 3 as the center.

[0038] Here, as shown in Figure 4(b), the reinforcing portions 17 of the reinforcing member 15 are arranged at a pitch P1 in each of the four divided sections, and the reinforcing portions 17 between adjacent sections are arranged at a pitch P2. Therefore, as shown in Figure 5(b), when the rainwater storage members 3 are installed horizontally, and the reinforcing members 15 are positioned with a half-pitch offset vertically and horizontally in a plan view, the reinforcing portions 17 and the column portions 7 will be in the same position. Consequently, for example, in Figure 5(b), if one attempts to shift the reinforcing member 15 to the adjacent column portion 7, the positions of the column portion 7 and the reinforcing portion 17 will be misaligned, thus preventing incorrect placement.

[0039] In this embodiment, the positions of the column portion 7 and the reinforcing member 17 of one rainwater storage member 3 and one reinforcing member 15 coincide in a plan view. Therefore, it is possible to position the reinforcing member 15 without horizontally shifting it relative to the rainwater storage member 3. On the other hand, if the pitch of the column portions 7 of the rainwater storage member 3 is all set to P1, then it becomes impossible to position the rainwater storage member 3 and the reinforcing member 15 in any arrangement other than that shown in Figure 5(b). Therefore, it is also possible to reliably position the reinforcing member 15 relative to the adjacent rainwater storage member 3, shifting them by half a pitch in the horizontal direction perpendicular to each other.

[0040] Figure 6(a) is a cross-sectional view showing a rainwater storage structure 1 in which a rainwater storage member 3 is further stacked above the reinforcing member 15. As mentioned above, the rainwater storage members 3 are stacked so that the tips of the column portions 7 face each other. Here, the upper and lower rainwater storage members 3 are positioned opposite each other at the same position in the vertical direction. That is, one rainwater storage member 3 is positioned opposite to one rainwater storage member 3 above it, and there is no horizontal displacement. On the other hand, as mentioned above, the reinforcing member 15 is positioned horizontally offset from the rainwater storage members 3.

[0041] As described above, the rainwater storage members 3 are simply stacked vertically, making layout and arrangement easy. For example, if the upper and lower rainwater storage members 3 were to be arranged with a horizontal offset, it would be necessary to use rainwater storage members of different shapes (e.g., 1 / 2 size or 1 / 4 size) in the outer periphery in a plan view, and in this case, the arrangement of these rainwater storage members would change depending on the number of layers, complicating the work. On the other hand, in this embodiment, since the rainwater storage members 3 are simply stacked vertically, it is sufficient to place a rainwater storage member 3 of the same shape above the lower rainwater storage member 3, making the work easy.

[0042] On the other hand, the reinforcing member 15 is positioned across multiple rainwater storage members 3. Therefore, when a horizontal force is applied to the rainwater storage members 3, the force can be efficiently transmitted and received by the multiple rainwater storage members 3. In addition, horizontal displacement of the rainwater storage members 3 can be suppressed.

[0043] Figure 6(b) is an enlarged view of section G in Figure 6(a). As described above, a reduced diameter section 13 is formed at the tip of the column section 7. The inner diameter of the reinforcing section 17 of the reinforcing member 15 is approximately the same as the outer diameter of the reduced diameter section 13, and the column sections 7 (reduced diameter section 13) of the rainwater storage member 3 are inserted from both sides of the reinforcing section 17 to connect the column sections 7. In other words, the reinforcing section 17 is positioned to cover the abutting section (reduced diameter section 13) of the column sections 7 from the outer circumference.

[0044] In this way, when the rainwater storage members 3 are stacked by butting the ends of the column sections 7 together, the reinforcing members 15 are placed at the butt joints of the column sections 7 and fixed to the column sections 7, thereby connecting and restraining the butt joints of the column sections 7.

[0045] As mentioned above, since the column section 7 becomes thinner towards the tip, the joints where the column sections 7 meet are the most susceptible to buckling due to vertical loads. In contrast, the reinforcing member 15 connects the joints of the column sections 7, so the joints of the column sections 7 are restrained by the other joints, thereby suppressing buckling. In particular, the joints of the column sections 7 are susceptible to deformation due to loads because they consist only of a fitting between a convex portion 9 and a concave portion 11, but the reinforcing member 15 suppresses deformation, resulting in higher strength.

[0046] Figure 7 is a conceptual diagram showing a rainwater storage structure 20 in which multiple rainwater storage members 3 are arranged horizontally and a reinforcing member 15 is positioned across four rainwater storage members 3 (the upper rainwater storage members are not shown). In addition, the rainwater storage structure 20 is also formed vertically by repeatedly creating multiple layers of the rainwater storage structure 1 shown in Figure 6(a). That is, multiple pairs of rainwater storage members 3 are stacked vertically to form the rainwater storage structure 20.

[0047] As shown in the diagram, by arranging multiple rainwater storage members 3 horizontally and further offsetting the reinforcing members 15 horizontally by half a pitch relative to the rainwater storage members 3, the horizontal rainwater storage members 3 are connected to each other, and the joints between the vertically arranged rainwater storage members 3 can be reinforced. In this way, by arranging multiple rainwater storage structures 1 continuously in the horizontal and vertical directions, it is possible to form a predetermined space underground for storing rainwater.

[0048] Here, as shown in Figure 7, reinforcing members 15 are not placed on a portion of the outermost column 7 of the rainwater storage member located on the outermost periphery in a plan view. As mentioned above, it is possible to place reinforcing members 15 on the opposing sides of all column 7 by using half-size reinforcing members, but it is not necessary to place reinforcing members 15 on all column 7 of the outermost column 7. The outermost rainwater storage member 3 is constrained by the inner surface of the rainwater storage tank, and some of the vertical force can also be received by the ground. For this reason, it is sufficient to place reinforcing members 15 on parts other than the outermost periphery without using specially shaped reinforcing members.

[0049] Even in this case, as shown in Figure 6(b), the butt joints of the column sections 7 are inserted into the reinforcing section 17, and the tips of the column sections 7 are in contact with each other when stacked. Therefore, both in the areas where the reinforcing member 15 is placed and in the areas where it is not, the upper and lower rainwater storage members 3 are in contact with each other when stacked. As a result, no gaps are created between the column sections 7 in the areas where the reinforcing member 15 is not placed.

[0050] According to the first embodiment, a reinforcing member 15 having multiple reinforcing parts 17 that reinforce the opposing parts of the column sections 7 is arranged at the opposing parts of the column sections 7, thereby suppressing deformation and buckling of the column sections 7. Furthermore, since the reinforcing member 15 is arranged to span across multiple rainwater storage members 3, horizontal forces can be transmitted to the multiple rainwater storage members 3. As a result, the shear strength and shear rigidity of the rainwater storage structure are improved, and the seismic performance can be enhanced.

[0051] Furthermore, since at least a portion of the reinforcing portion 17 of the reinforcing member 15 is arranged at a pitch P1 and the other portion is arranged at a pitch P2, it is possible to prevent the reinforcing member 15 from being placed in the wrong position relative to the rainwater storage member 3.

[0052] Furthermore, since the rainwater storage members 3, which are stacked vertically, are stacked vertically without shifting horizontally, the layout of the rainwater storage members 3 is easy.

[0053] Furthermore, the rainwater storage members 3 that are positioned opposite each other are stacked so that the tips of the column portions 7 are in contact with each other, regardless of whether or not the reinforcing members 15 are present. Therefore, even if the reinforcing members 15 are not provided for some of the column portions 7 on the outer periphery of the rainwater storage tank, the formation of gaps between the column portions 7 can be suppressed.

[0054] Next, a second embodiment will be described. Figure 8 is a perspective view showing the rainwater storage member 3a. In the following description, components similar to those in the first embodiment will be denoted by the same reference numerals as in Figure 1, etc., and redundant explanations will be omitted.

[0055] The rainwater storage member 3a has substantially the same configuration as the rainwater storage member 3, but differs in that a substrate fitting projection 21 and a substrate fitting recess 23 are formed on the outer surface of the substrate 5. In the illustrated example, a substrate fitting projection 21 and a substrate fitting recess 23 are formed on each side. In a plan view, the substrate fitting projection 21 is formed so as to protrude laterally in a substantially trapezoidal shape with a narrow tip, and the substrate fitting recess 23 is a concave shape formed on the side corresponding to the substrate fitting projection 21.

[0056] When multiple rainwater storage members 3a are installed side by side, the substrate fitting protrusions 21 and substrate fitting recesses 23 of adjacent rainwater storage members 3a fit together. In this case, both the substrate fitting protrusions 21 and substrate fitting recesses 23 have the same shape in the height direction. Therefore, when installing a rainwater storage member 3a next to an existing rainwater storage member 3a, it can be slid and fitted onto the existing rainwater storage member 3a from either above or the side. As a result, there is no need to lift one of the rainwater storage members 3a during fitting, and no fitting work is required.

[0057] Furthermore, the same effects as in the first embodiment can be obtained by arranging the reinforcing member 15 so as to span across multiple rainwater storage members 3a, with the rainwater storage members 3a also being installed horizontally side by side.

[0058] Although embodiments of the present invention have been described above with reference to the attached drawings, the technical scope of the present invention is not limited to the embodiments described above. It is clear to those skilled in the art that various modifications or alterations can be conceived within the scope of the technical idea described in the claims, and these will naturally also fall within the technical scope of the present invention.

[0059] For example, in the above embodiment, the number of reinforcing parts 17 of the reinforcing member 15 and the number of column parts 7 of the rainwater storage members 3 and 3a are the same, and an example has been described in which all opposing parts of the column parts 7, excluding the outer periphery of the overall structure, are reinforced by the reinforcing parts 17. However, the embodiment is not limited to this. For example, for a reinforcing member 15 (approximately the same size as the rainwater storage member) having 4x4 reinforcing parts 17, the reinforcing parts 17 may be omitted except for the four corner reinforcing parts 17, and the reinforcing parts 17 may be placed only on the column parts 7 corresponding to the four corner reinforcing parts 17 of each of the four adjacent rainwater storage members 3 and 3a. Alternatively, for a reinforcing member 15 having 4x4 reinforcing parts 17, the reinforcing parts 17 may be omitted except for the 12 reinforcing parts 17 on the outer periphery, and the reinforcing parts 17 may be placed only on the column parts 7 corresponding to the reinforcing parts 17 of each of the four adjacent rainwater storage members 3 and 3a. Thus, the reinforcing portion of the reinforcing member may be smaller than the column portion of the rainwater storage member, and the reinforcing portion may be placed only on a portion of the column portion of the rainwater storage member. [Explanation of Symbols]

[0060] 1, 20... Rainwater storage structure 3, 3a... Rainwater storage member 5... Circuit board 7……Column part 9………Convex part 11………recess 13……Reduced diameter part 15… Reinforcement member 17… Reinforcement section 19……Connection part 21...Protrusions for substrate mating 23………Substrate mating recess

Claims

1. A rainwater storage structure composed of multiple rainwater storage members stacked on top of each other, The rainwater storage member comprises a base plate and a plurality of columnar portions that stand upright on the base plate. Multiple rainwater storage members are arranged horizontally, The lower rainwater storage member and the upper rainwater storage member are stacked so that the tips of the column portions face each other. In the opposing portions of the column portions, a reinforcing member having a plurality of reinforcing portions that reinforce the opposing portions of the column portions is arranged. A rainwater storage structure characterized in that the reinforcing member is arranged to span across a plurality of rainwater storage members that are arranged side by side in the horizontal direction.

2. The rainwater storage structure according to claim 1, characterized in that the upper and lower rainwater storage members are arranged facing each other at the same position in the vertical direction.

3. The reinforcing member has the same number of reinforcing parts as the column portion of the rainwater storage member, The rainwater storage structure according to claim 2, characterized in that the reinforcing member is positioned at a horizontally offset position from the rainwater storage member.

4. At least some of the adjacent column portions on the substrate are arranged at the same pitch P1, and when the rainwater storage members are installed horizontally, the pitch P2 between adjacent column portions spanning adjacent rainwater storage members is different from the pitch P1. The rainwater storage structure according to claim 1, characterized in that at least a portion of the reinforcing portion of the reinforcing member is arranged at the pitch P1 and the other portion is arranged at the pitch P2.

5. The rainwater storage structure according to claim 1, characterized in that the reinforcing portion of the reinforcing member is ring-shaped, and the butt joints of the column portions are inserted into the reinforcing portion, and the tips of the column portions are in contact with each other and stacked.

6. The rainwater storage structure according to claim 5, characterized in that the reinforcing members are arranged so as to span the four adjacent rainwater storage members, with each member offset by half a pitch in each of the mutually orthogonal horizontal directions, and the reinforcing members are not arranged on a part of the column portion on the outer circumference side of the rainwater storage member arranged on the outermost periphery.

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