Collection path forming member and water storage structure using the same

Abstract

To provide a collection route forming member capable of securing the volume of the flow passage of rain water and stably keeping underground infiltration of the rain water over a long period, by easily removing dust and fallen leaves having flowed into a layer structure together with rain water, and a water storage structure using therewith.SOLUTION: A collection route forming member is used for forming a layer structure formed by vertically laying in a water storage tank formed by excavating ground, and forming a base part and a foreign matter collection route attached to a layer member having a column part formed to the base part and for collecting the foreign matter in the layer structure. The collection route forming member has grooves arranged among the columns of the layer member and forming the foreign matter collection route, and a water receiving part integrally provided to an opening end part of the groove and mounted to the column part of the layer member.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a collection path forming member and a water storage structure using the same. [Background technology]

[0002] In recent years, when large amounts of rainfall occur in a short period of time due to localized heavy rain (guerilla downpours), the rainwater flows into the sewer system, but there have been cases where the sewer system's capacity to remove the rainwater is exceeded, resulting in flooding damage.

[0003] One of the countermeasures for such a situation is the rainwater infiltration trench. A rainwater infiltration trench is constructed by placing a synthetic resin pipe to guide rainwater into a water tank excavated in the ground and filling the area around this synthetic resin pipe with crushed stone, allowing the rainwater to infiltrate underground through the trench.

[0004] Patent Document 1 proposes a connecting unit for infiltration trenches which is a connecting unit that can be connected together to form an infiltration trench, the connecting unit comprising a frame body which defines a storage area on the inside and is provided with a water passage section for ensuring the passage of water from the storage area to the outside, and a water conduit section which is provided within the frame body and can communicate with the storage area, the connecting unit being configured to be connectable in series to other units which are arranged adjacent to the unit, and which is capable of constructing a series of water conduit paths within the infiltration trench by means of each water conduit section when multiple units are connected in series.

[0005] Patent Document 2 proposes an assembly for a rainwater storage and infiltration facility including a structural body for the rainwater storage and infiltration facility and a water passage groove member, wherein the structural body has an internal space extending in the longitudinal direction, and the water passage groove member is semi-cylindrical and penetrates the internal space along the longitudinal direction. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2004-183294 A [Patent Document 2] JP 2009-24453 A Summary of the Invention [Problem to be solved by the invention]

[0007] Rainwater from various locations, including the roofs of buildings such as condominiums and detached houses, as well as roads and parks, flows into the trenches, and this rainwater contains foreign objects such as garbage and fallen leaves.

[0008] As a result, foreign matter contained in rainwater, such as garbage and fallen leaves, accumulates over time inside the connecting units for infiltration trenches and the rainwater storage and infiltration facility assemblies, reducing the volume of the rainwater flow passage and reducing the efficiency of rainwater infiltration into the ground.In addition, if too much foreign matter accumulates, there is a risk that the rainwater that has flowed into the trench will flow back.

[0009] However, the connecting unit for infiltration trenches of Patent Document 1 and the assembly for rainwater storage and infiltration facilities of Patent Document 2 have the problem that foreign matter accumulated inside them cannot be easily removed, making them difficult to maintain.

[0010] The present invention provides a collection channel forming member and a water storage structure using the same that can easily remove foreign matter such as garbage and fallen leaves that have flowed into a laminated structure along with rainwater, ensure the volume of the rainwater flow passage, and maintain stable underground infiltration of rainwater over a long period of time. [Means for solving the problem]

[0011] The collection path forming member of the present invention is A collection path forming member is attached to a stacking member having a base portion and a column portion formed on the base member, and is stacked in a vertical direction in a water storage tank formed by excavating the ground to form a stacked structure, and forms a foreign object collection path for collecting foreign objects in the stacked structure, The present invention is characterized in that it has a groove portion disposed between the pillar portions of the laminated member to form the foreign matter collection path, and a water receiving portion integrally formed at the open end of the groove portion and attached to the pillar portions of the laminated member.

[0012] The water storage structure of the present invention comprises: A laminated structure is disposed in a water tank formed by excavating the ground, and is constructed by vertically stacking laminated members each having a base portion and a column portion formed on the base portion; The present invention is characterized in that it comprises a collection path forming member having a groove portion disposed between the pillar portions of the laminated member to form the foreign matter collection path, and a water receiving portion integrally formed at the open end of the groove portion and attached to the laminated member. Effect of the Invention

[0013] By attaching the collection path forming member of the present invention to the column portion formed in the base portion, a foreign object collection path for collecting foreign objects within the laminated structure can be easily formed. Foreign objects such as garbage and fallen leaves that have accumulated within the laminated structure can be accumulated in the foreign object collection path and then easily removed outside the laminated structure along the foreign object collection path, making it easy to maintain the water storage structure.

[0014] The collection path forming member of the present invention can be easily arranged within the laminated structure by attaching it to a column portion formed in the base portion, and there is no need to prepare special laminated members, so it can be easily applied to general-purpose laminated members and a foreign object collection path can be easily provided within the laminated structure.

[0015] Since the collection path forming member of the present invention is formed separately from the stacking members that constitute the stacked structure, it can be stored separately from the stacking members, making it possible to reduce the storage space.

[0016] Furthermore, since the collection path forming members can be transported to the construction site separately from the stacked members, the overall volume of the stacked members and collection path forming members to be transported can be reduced, thereby simplifying the transportation work and reducing transportation costs. [Brief description of the drawings]

[0017] [Figure 1] FIG. 2 is a cross-sectional view showing a water storage structure. [Diagram 2] FIG. [Diagram 3] FIG. [Figure 4] FIG. 4 is a perspective view showing a collection path forming member. [Diagram 5] FIG. 4 is a cross-sectional view showing a collection path forming member. [Figure 6] 13 is a perspective view showing a manner in which the collection path forming member is attached to the stacked member. FIG. [Figure 7] 13 is a perspective view showing a state in which a collection path forming member is attached to a stacked member. FIG. [Figure 8] FIG. 2 is a front view showing a part of the laminated structure. [Figure 9] FIG. 11 is a perspective view showing another example of a laminated member. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] An example of the collection path forming member and the water storage structure using the same of the present invention will be described with reference to the drawings. The collection path forming member is used to construct the water storage structure. The water storage structure includes a rainwater storage structure constructed underground as a storage space for collected rainwater, and a rainwater infiltration trench that temporarily stores the collected rainwater underground while slowly discharging it into the ground and dispersing and infiltrating it. The rainwater storage structure also includes a rainwater storage structure that stores the collected rainwater while gradually discharging it into a sewer or a river.

[0019] Rainwater infiltration trenches are constructed underground for the purposes of making effective use of rainwater, preventing urban flooding caused by rainwater suddenly flowing into rivers or underground storm water pipe networks, and recharging groundwater and preventing land subsidence.

[0020] The collection path forming member is used to form a foreign object collection path in the laminated structure. As shown in Figures 1 and 2, the laminated structure A is constructed by stacking laminated members C in the vertical direction, and also in the front-rear and / or left-right direction as necessary, in a water storage tank B formed by excavating the ground. The front-rear direction refers to the length direction of the foreign object collection path described later, and the left-right direction refers to the direction perpendicular to the foreign object collection path.

[0021] As shown in FIG. 3, the laminated member C has a base portion 11 that is rectangular in plan view and has a predetermined thickness (preferably a constant thickness), and a plurality of column portions 12 standing on the upper surface of the base portion 11.

[0022] The base portion 11 of the laminated member C has a planar rectangular frame body 111 and lattice-shaped batten members 112 which divide the frame body 111, and each of the divisions 112a of the batten members 112 has a water passage hole 112b formed therein which penetrates in the vertical direction.

[0023] A plurality of pillars 12 of the laminated member C are formed on the upper surface of the base 11, independently of one another, integrally at predetermined intervals in the width and length directions of the base 11. The pillars 12 are formed in a quadrangular pyramid shape (truncated quadrangular pyramid). The front and rear surfaces of the pillars 12 are partially cut out in the vertical direction at the center in the left-right direction to form grooves 121, 121, and the left and right side surfaces of the pillars 12 are cut out in the vertical direction at the center in the front-to-rear direction over their entire length, to form grooves 122, 122, which improves the strength of the pillars 12 and increases the flow capacity of rainwater within the laminated structure. Furthermore, protrusions 123, 123 are formed on the front-rear end portions of the upper surface of the column portion 12, and these protrusions 123, 123 are detachably fitted into the compartments 112a of the rail member 112 on the lower surface of the base portion 11 of another laminated member C to be stacked on top of the laminated member C, so that a plurality of laminated members C, C, etc. can be stably stacked in the vertical direction. Note that the column portion 12 may also be formed with a water passage hole 124 that penetrates in the vertical direction.

[0024] 6 and 7, the collection path forming member D is disposed in a space formed between the column portions 12, 12 of the laminated members. The collection path forming member D has a groove portion 2 formed in a semicircular arc shape that is long in the front-rear direction, and water receiving portions 3 integrally formed on the left and right open ends of the groove portion 2, respectively.

[0025] The groove 2 of the collection path forming member D is formed in a semicircular arc shape (a downwardly convex arc shape in cross section) over its entire length in the front-rear direction, and is configured to accumulate and collect foreign matter such as garbage and fallen leaves (hereinafter simply referred to as "foreign matter") that has flowed down from the water receiving part 3 on the groove 2. In Fig. 4, no water permeable hole is formed penetrating in the vertical direction in the groove 2, but a water permeable hole large enough to prevent foreign matter from passing through may be formed penetrating in the vertical direction.

[0026] The collection path forming member D is used by connecting a plurality of collection path forming members D, D... in series in the front-rear direction. A connection receiving portion 22 is formed at the rear end of the groove portion 2 of the collection path forming member D, the connection receiving portion 22 receiving the connection piece 21 protruding from the front end of the groove portion 2 of the collection path forming member D connected to the rear and having an upper surface formed into a concave arc-shaped surface. A weakened portion 211 is formed at the base end of the connection piece 21 to enable the connection piece 21 to be cut off as necessary.

[0027] That is, in a plurality of collection path forming members D, D connected in series, by placing the connection piece 21 of the groove portion 2 of the collection path forming member D arranged at the rear on the connection receiving portion 22 of the groove portion 2 of the collection path forming member D arranged at the front, the groove portions 2, 2 of the collection path forming members D, D arranged in series in the front-to-rear direction are continuously connected to each other without any gaps in the longitudinal direction and so that the upper surfaces are approximately flush, thereby forming a foreign matter collection path E within the laminated structure A.

[0028] Water receiving portions 3, 3 are formed integrally with the left and right open ends of the groove portion 2 of the collection path forming member D. The water receiving portion 3 is formed as a planar rectangular plate-like body that is inclined diagonally downward from the left and right ends toward the groove portion 2, and its entire length excluding the front and rear ends is connected and integrated with the left and right open ends of the groove portion 2.

[0029] A large number of water-passing holes 31 penetrating from the upper to lower surfaces are formed in the water receiving portion 3. The water-passing holes 31 are formed to be large enough to allow rainwater to pass through but not allow most of the foreign matter contained in the rainwater to pass through.

[0030] Furthermore, the water receiving portion 3 is formed with a plurality of pillar insertion openings 32 through which the pillars 12 of the stacked member C can be inserted. The pillar insertion openings 32 are formed at positions corresponding to the pillars 12 of the stacked member C when the collection path forming member D is disposed in the space between the pillars 12, 12 of the stacked member C.

[0031] The shape of the pillar insertion opening 32 is formed to match or be slightly larger than the cross-sectional shape of the pillar 12 along the upper surface (lower surface) of the water receiving part 3 in a state in which the pillar 12 of the laminated member C is inserted into the pillar insertion opening 32 and the collection path forming member D is disposed on the laminated member C. Therefore, in a state in which the collection path forming member D is disposed on the laminated member C, a gap is formed between the pillar insertion opening 32 of the water receiving part 3 and the outer peripheral surface of the pillar 12 of the laminated member C facing it, so that most of the foreign matter contained in rainwater cannot pass through.

[0032] The front and rear ends of the water receiving portion 3 are not connected to the front and rear ends of the groove portion 2, but are formed into pipe receiving portions 33, 33 arranged at a predetermined distance outward from the front and rear ends of the groove portion, respectively, and whose inner surfaces are formed into an arc-shaped surface to receive the connecting pipe F, and leg portions 34, 34 formed downward from the lower ends of the pipe receiving portions 33, 33, so that when the collection path forming member D is arranged between the column portions 12, 12 of the stacked member C, the leg portions 34 of the water receiving portion 3 are placed on the upper surface of the base portion 11.

[0033] Between the opposing surfaces of the pipe receiving portion 33 of the water receiving portion 3 and the groove portion 2, a gap is formed into which the connecting pipe F can be inserted. When the collecting path forming members D, D arranged in the front-rear direction are connected in the front-rear direction with the connecting piece 21 of the groove portion 2 of the rear collecting path forming member D received by the connecting receiving portion 22 of the groove portion 2 of the front collecting path forming member D, a pipe receiving space G for arranging the connecting pipe F is formed between the pipe receiving portions 33, 33 of the front and rear collecting path forming members D, D and the opposing groove portions 2, 2. The connecting pipe F arranged in the pipe receiving space G can prevent foreign matter accumulated on the foreign matter collecting path E formed by connecting the groove portions 2 of the collecting path forming members D from dropping downward from between the collecting path forming members D, D. The movement of the connecting pipe F disposed in the pipe accommodating space G is restricted in the front-rear direction by a step 33a formed at the end of the pipe receiving portion 33.

[0034] Furthermore, as shown in Figures 7 and 8, long protrusions 35, 35 extending in the front-to-rear direction are provided at the front and rear of the left and right ends of the upper surface of the water receiving portion 3, and the protrusions 35, 35 abut against the underside of the base portion 11 of the laminated member C placed above, so that when rainwater flows into the laminated structure A in the water tank, the collection path forming member D does not float up more than necessary.

[0035] Next, a method for constructing a water storage structure using the collection channel forming member D will be described. First, the ground is excavated along a route connecting the collection basin H and a sewer or the like to form a water storage tank B having a specified width, length and depth. Cylindrical collection basins H, H are disposed and fixed to both ends of the water storage tank B in the longitudinal direction.

[0036] Next, a permeable sheet (not shown) is arranged along the bottom and four side surfaces of the space between the water collecting basins H, H in the water tank B. Then, as shown in Figs. 1 and 2, the laminated member C is laid on the bottom of the water tank B with no gaps in the front-rear direction via the permeable sheet. In this state, the base portion 11 of the laminated member C is laid on the bottom of the water tank B with no gaps, and the column portion 12 formed on the base portion 11 is arranged at a predetermined interval in the left-right direction and the front-rear direction. Note that Fig. 1 shows a case where a plurality of laminated members C are laid in a state of being connected in series in the front-rear direction, but only one laminated member C may be laid, or the laminated members C may be laid in a plurality of rows in the left-right direction. In addition, the laminated members D laid in the water tank B may be a plurality of types of laminated members having different lengths.

[0037] 6 and 7, the collection path forming member D is disposed on the stacked member C with the pillars 12 of the stacked member C inserted into the pillar insertion openings 32 of the water receiving portion 3. Next, the collection path forming member D is disposed on the stacked member C connected to the rear of the stacked member C on which the collection path forming member D is disposed, in the same manner as described above. In this state, the connection piece 21 of the collection path forming member D (D2) disposed at the rear is received on the connection receiving portion 22 of the groove 2 of the collection path forming member D (D1) disposed at the front, and the grooves 2, 2 of the front and rear collection path forming members D, D are connected to each other. By connecting the collection path forming members D in series in the front-rear direction in the above manner, the grooves 2 of the collection path forming members D are continuously connected in series in the front-rear direction to form one foreign object collection path E.

[0038] Furthermore, when the connecting pipe F is disposed in the pipe storage space G formed between the collection path forming members D, D connected in front and behind, the connecting pipe F is disposed between the collection path forming members D, D disposed in front and behind, and then the front and rear collection path forming members D1, D2 can be disposed in the manner described above.

[0039] Thereafter, other laminated members C, C... are laminated on top of the laminated members C, C... disposed on the bottom surface of the water tank B, and the laminated members C, C... are laminated vertically and, if necessary, horizontally inside the water tank B to construct the laminated structure A. A flat panel is placed on the topmost laminated members C, C, and then covered with a covering material K such as a concrete plate or a mesh plate.

[0040] When arranging collection path forming members D, D... on the top layer of laminated members C, C..., they may be constructed in the same manner as when arranging collection path forming members D, D... on the bottom layer of laminated members C, C....

[0041] Each of the collection basins H arranged within both longitudinal ends of the water tank B has inlets H1, H2 formed in the upper and lower parts of the wall portion facing the laminated structure A, penetrating between the inner and outer peripheral wall surfaces of the collection basin H.

[0042] The lower inlet H1, H1 of the collection basins H, H is formed opposite the longitudinal opening end of a foreign matter collection path E formed by connecting the groove portions 2 of a plurality of collection path forming members D arranged on the lowest layer of laminated member C, and the opening end of the foreign matter collection path E and the lower inlet H1 of the collection basin H are connected and communicated via a pipe body J as necessary.

[0043] Similarly, the upper inlet H2, H2 of the collection basins H, H are formed opposite the longitudinal opening end of a foreign matter collection path E formed by connecting the groove portions 2 of multiple collection path forming members D arranged on the top layer of laminated member C, and the opening end of the foreign matter collection path E and the upper inlet H2 of the collection basin H are connected and communicated via a pipe body J as necessary.

[0044] The water storage structure I used as a rainwater infiltration trench constructed in this manner is disposed in a laminated structure A constructed in a water storage tank B excavated in the ground, with the foreign matter collection path E formed by the groove portion 2 of the collection path forming member D oriented horizontally, and both ends in the longitudinal direction of the foreign matter collection path E are connected and communicated with the water collection basin H. Therefore, rainwater flowing into the water collection basin H flows into the laminated structure A through the inlets H1 and H2 of the water collection basin H and both ends in the longitudinal direction of the foreign matter collection path E.

[0045] Rainwater flowing into the laminated structure A from the inlets H1 and H2 of the catchment basin H is temporarily stored in the water tank B, and then passes through the permeable sheet arranged on the inner surface of the water tank B and is slowly discharged into the ground, where it is dispersed and infiltrated.

[0046] Rainwater flowing in through the inlets H1 and H2 of the catchment basin H is stored in all or part of the laminated structure A, but as the rainwater disperses and seeps from the water tank B into the ground, the rainwater in the laminated structure A gradually moves downward.

[0047] The stacked members C constituting the intermediate layers other than the stacked members C constituting the top and bottom layers are not provided with the collection path forming members D. In the intermediate layers of the stacked structure A, rainwater in the stacked structure A moves smoothly downward through the water passage holes 112b of the base parts 11 of the stacked members C and the water passage holes 124 of the column parts 12.

[0048] Meanwhile, collection path forming members D are disposed on the top and bottom layer laminated members C, and the space formed by the laminated members C is partitioned into upper and lower parts by the collection path forming members D. Therefore, when rainwater passes through the space formed by the top and bottom layer laminated members C, the rainwater moves downward mainly through the water passage holes 31 formed in the water receiving portion 3 of the collection path forming members D.

[0049] Foreign matter contained in the rainwater cannot pass through the water passage holes 31 formed in the water receiving portion 3 of the collection path forming member D, and remains stuck on the collection path forming member D. Then, when the amount of rainwater filling the laminated structure A decreases and the water near the surface of the rainwater passes through the collection path forming member D, the foreign matter contained in the rainwater moves along the inclined surface of the water receiving portion 3 toward the foreign matter collecting path E (groove portion 2), and is accumulated and collected in the foreign matter collecting path E.

[0050] In this way, foreign matter that flows into the laminated structure A along with rainwater is accumulated and collected in the foreign matter collection path E of the collection path forming member D, thereby reducing as much as possible the amount of foreign matter remaining dispersed within the laminated structure A and maintaining the rainwater storage volume (flow path volume) within the laminated structure A.

[0051] When a connecting pipe F is disposed at the connection between the collection path forming members D, D, the connecting pipe F receives foreign matter that has fallen off the foreign matter collection path E, thereby reducing as much as possible the foreign matter falling off below the collection path forming member D and remaining dispersed within the laminated structure A, thereby maintaining the rainwater storage volume within the laminated structure A.

[0052] The foreign matter collected and accumulated on the foreign matter collecting path E of the collecting path forming members D, D, etc. can be removed by using the inlets H1, H2 of the collecting basins H. For example, cleaning water is sprayed from the inlets H1, H2 of one of the collecting basins H, and the foreign matter accumulated on the foreign matter collecting path E is removed from the outlets H1, H2 of the other collecting basin H. Since the foreign matter collecting path E is formed into a smoothly curved surface over its entire length, the foreign matter accumulated on the foreign matter collecting path E can be smoothly pushed from the foreign matter collecting path E into the collecting basin H by the cleaning water and discharged outside the laminated structure A. Note that instead of cleaning water, a cleaning tool may be inserted into the foreign matter collecting path E from the inlets H1, H2 of one of the collecting basins H, and the foreign matter collected on the foreign matter collecting path E may be pushed to the outlets H1, H2 of the other collecting basin H, and removed outside the laminated structure A.

[0053] In addition, a cleaning tool for scraping out foreign matter accumulated on the foreign matter collecting path E can be inserted into the foreign matter collecting path E of the collection path forming members D, D, etc., and the foreign matter accumulated on the foreign matter collecting path E can be discharged outside the laminated structure A by using the cleaning tool to pull the foreign matter accumulation on the foreign matter collecting path E toward the front and scrape it out.

[0054] As described above, foreign matter collected on the foreign matter collection path E formed by the collection path forming members D, D, etc. can be easily discharged outside the laminated structure A using cleaning water or a cleaning tool such as a cleaning instrument, and the water storage structure I has excellent maintainability.

[0055] In the above-mentioned water storage structure I, the case where the water collection basins H, H are arranged at both ends in the longitudinal direction of the water storage tank B has been described, but the case where only one water collection basin H is arranged in the water storage tank B may also be used.

[0056] Furthermore, although the water storage structure I described above is a rainwater infiltration trench, the water storage structure I may also be a rainwater storage structure constructed underground as a storage space for collected rainwater.

[0057] When the water storage structure I is a rainwater storage structure, the laminated members C are arranged side by side in multiple rows and columns without gaps in the front, back, left and right directions to form a laminated structure A. The bottom surface and four side surfaces of the laminated structure A are covered with a non-permeable sheet that does not allow rainwater to pass through.

[0058] Then, a plurality of collection path forming members are arranged in the laminate member C of any layer (preferably the bottom layer and / or the top layer) in the laminate structure A in the same manner as described above, and a foreign matter collection path is formed by connecting the groove portions of the collection path forming members in series.

[0059] Then, a water collection basin is arranged along a portion of one of the side surfaces of the laminated structure A, and an inlet is formed through this water collection basin in the inward and outward directions as described above. This inlet is then connected and communicated with the open end of the foreign matter collection path formed by connecting the groove portions of the collection path forming member in series, thereby constructing a rainwater storage structure.

[0060] Moreover, the laminated member C does not have to have the structure shown in Fig. 3. In the laminated member of Fig. 3, a plurality of independent pillars 12 are integrally formed on the base, but the pillars 12 may be continuous in the longitudinal direction on the base 11, rather than being independent of each other in the front-rear direction (see Fig. 9). In such a case, protrusions 13 may be formed intermittently in the longitudinal direction at the upper ends of the pillars 12, and the pillar insertion openings 32 of the water receiving portion 3 of the collection path forming member D may be fitted into the protrusions, and the collection path forming member D may be attached to the laminated member C. [Explanation of symbols]

[0061] 2 Groove 11 Base 12 Pillar section 21 Connection piece 3 Water receiving section 32 Pillar insertion hole 33 Tube receiving part A. Laminated structure B Water tank C Laminated material D Collection path forming member E Foreign object collection passage F Connection pipe G Tube storage space H. Water collection basin H1 Lower inlet H2 Upper inlet I. Water storage structure J Body

Claims

1. A collection path forming member is attached to a stacking member having a base portion and a column portion formed on the base portion, which is stacked vertically in a water storage tank formed by excavating the ground to form a stacked structure, and which forms a foreign object collection path for collecting foreign objects in the stacked structure, A collection path forming member characterized by having a groove portion arranged between the pillar portions of the laminated member to form the foreign matter collection path, and a water receiving portion integrally formed at an opening end of the groove portion and attached to the pillar portions of the laminated member.

2. 2. The collection path forming member according to claim 1, wherein the water receiving portion has a pillar portion insertion opening through which the pillar portion of the laminated member is inserted.

3. 3. The collection path forming member according to claim 1, wherein the groove portion is formed to have an arc-shaped cross section.

4. 4. The collection path forming member according to claim 1, wherein the water receiving portion is inclined downward toward the groove portion.

5. The collection path forming member according to any one of claims 1 to 4, characterized in that the collection path forming member forms a foreign object collection path by connecting a plurality of collection path forming members in the longitudinal direction of their groove portions, and the ends of adjacent groove portions are overlapped and configured to be connectable.

6. A laminated structure is disposed in a water tank formed by excavating the ground, and is constructed by vertically stacking laminated members each having a base portion and a column portion formed on the base portion; A water storage structure comprising: a collection path forming member having a groove portion disposed between the pillar portions of the laminated member to form a foreign object collection path; and a water receiving portion integrally formed at an open end of the groove portion and attached to the laminated member.

7. 7. The water impoundment structure of claim 6, wherein the water impoundment structure is a storm water infiltration trench.

8. 7. The water storage structure according to claim 6, wherein the water storage structure is a rainwater storage structure.

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