JP7626520B2 - Collection path forming member and water storage structure using the same - Google Patents

Description

The present invention relates to a collection path forming member and a water storage structure using the same.

In recent years, when large amounts of rain fall in a short period of time due to localized heavy rains (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, causing flooding damage.

One of the countermeasures to this 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.

Patent Document 1 proposes a connecting unit for an infiltration trench that can be connected together to form an infiltration trench, and includes a frame that defines a storage area on the inside and has a water passage section for ensuring water passage from the storage area to the outside, and a water conveyance pipe section that is provided within the frame and can communicate with the storage area, and is configured to be connectable in series to other units that are arranged adjacent to the unit, and when multiple units are connected in series, each water conveyance pipe section can form a series of water conveyance paths within the infiltration trench.

Patent Document 2 proposes an assembly for a rainwater storage and infiltration facility that includes a structure for the rainwater storage and infiltration facility and a water passage groove member, in which the structure has an internal space extending in the longitudinal direction, and the water passage groove member is a semi-cylinder that penetrates the internal space along the longitudinal direction.

JP 2004-183294 A JP 2009-24453 A

Rainwater from various places, including the roofs of buildings such as condominiums and detached houses, as well as roads and parks, flows into the trenches, and the rainwater that flows in contains foreign objects such as garbage and fallen leaves.

As a result, foreign matter contained in rainwater, such as garbage and fallen leaves, accumulates over time inside the infiltration trench connection unit or the rainwater storage and infiltration facility assembly, 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.

However, the connection unit for infiltration trenches in Patent Document 1 and the assembly for rainwater storage and infiltration facilities in Patent Document 2 have the problem that foreign matter that accumulates inside them cannot be easily removed, making them difficult to maintain.

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 the laminated structure along with rainwater, ensure the volume of the rainwater flow passage, and stably maintain underground infiltration of rainwater for a long period of time.

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.

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 member;
The present invention is characterized in that it comprises a collection path forming member having a groove portion disposed between the column 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.

By attaching the collection path forming member of the present invention to the pillar 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 from the laminated structure along the foreign object collection path, making it easy to perform maintenance on the water storage structure.

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

The collection path forming member of the present invention is formed separately from the stacking members that make up the stacked structure, so it can be stored separately from the stacking members, reducing storage space.

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, simplifying the transportation work and reducing transportation costs.

FIG. 2 is a cross-sectional view showing a water storage structure. FIG. FIG. FIG. 4 is a perspective view showing a collection path forming member. FIG. 4 is a cross-sectional view showing a collection path forming member. 13 is a perspective view showing a manner in which the collection path forming member is attached to the stacked member. FIG. 13 is a perspective view showing a state in which a collection path forming member is attached to a stacked member. FIG. FIG. 2 is a front view showing a part of the laminated structure. FIG. 11 is a perspective view showing another example of a laminated member.

An example of the collection path forming member of the present invention and a water storage structure using the same will be described with reference to the drawings. The collection path forming member is used to construct a 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 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 collected rainwater while gradually discharging it into sewers, rivers, etc.

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.

The collection path forming member is used to form a foreign object collection path within 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, within a water tank B formed by excavating the ground. Note that the front-rear direction refers to the length direction of the foreign object collection path described below, and the left-right direction refers to the direction perpendicular to the foreign object collection path.

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 number of columns 12 erected on the upper surface of the base portion 11.

The base portion 11 of the laminated member C has a planar rectangular frame body 111 and lattice-shaped batten members 112 that divide the frame body 111, and each division 112a of the batten members 112 has a water passage hole 112b that penetrates in the vertical direction.

The pillars 12 of the laminated member C are formed integrally on the upper surface of the base 11, independent of each other, at a predetermined interval 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 faces 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 faces of the pillars 12 are cut out in the vertical direction at the center in the front-to-back 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 of the upper surface of the column 12, and these protrusions 123, 123 are detachably fitted into the compartments 112a of the rail members 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 multiple laminated members C, C... can be stably stacked in the vertical direction. Note that the column 12 may also be formed with a water passage hole 124 that penetrates in the vertical direction.

As shown in Figures 6 and 7, the collection path forming member D is disposed in the space formed between the pillars 12, 12 of the laminated member. The collection path forming member D has a groove portion 2 formed with a semicircular cross section that is long in the front-rear direction, and a water receiving portion 3 formed integrally with each of the left and right opening ends of this groove portion 2.

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

The collection path forming member D is used by connecting multiple collection path forming members D, D... in series in the front-rear direction. At the rear end of the groove 2 of the collection path forming member D, a connection receiving portion 22 is formed with a concave arc-shaped upper surface that receives the connection piece 21 protruding from the front end of the groove 2 of the collection path forming member D connected to the rear. In addition, at the base end of the connection piece 21, a weakened portion 211 is formed to enable the connection piece 21 to be cut off as necessary.

In other words, 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 in a state in which the groove portions 2, 2 of the collection path forming members D, D arranged in series in the front-rear direction are continuously connected to each other without any gaps in the length direction and so that the upper surfaces are approximately flush, and a foreign object collection path E is formed within the laminated structure A.

Water receiving portions 3, 3 are integrally formed at 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 flat rectangular plate-like body that slopes 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.

The water receiving section 3 has many water holes 31 that penetrate from the top to the bottom. The water holes 31 are large enough to allow rainwater to pass through, but large enough to block most of the foreign matter contained in the rainwater.

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

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 section 3 when 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, when the collection path forming member D is disposed on the laminated member C, only a gap is formed between the pillar insertion opening 32 of the water receiving section 3 and the outer peripheral surface of the pillar 12 of the laminated member C that faces it, so that most foreign objects contained in rainwater cannot pass through.

The front and rear ends of the water receiving section 3 are not connected to the front and rear ends of the groove section 2, but are formed with pipe receiving sections 33, 33 arranged outward from the front and rear ends of the groove section at a predetermined distance, with the inner surface formed into an arc-shaped surface to receive the connecting pipe F, and legs 34, 34 formed downward from the lower ends of the pipe receiving sections 33, 33. When the collection path forming member D is arranged between the pillar sections 12, 12 of the stacked member C, the legs 34 of the water receiving section 3 are configured to be placed on the upper surface of the base section 11.

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. Then, between the collection path forming members D, D arranged in the front-rear direction, when the connection piece 21 of the groove portion 2 of the rear collection path forming member D is received by the connection receiving portion 22 of the groove portion 2 of the front collection path forming member D, the collection path forming members D, D are connected in the front-rear direction, and a pipe storage space G for arranging the connecting pipe F is formed between the pipe receiving portions 33, 33 of the front and rear collection path forming members D, D and the opposing groove portions 2, 2. The connecting pipe F arranged in this pipe storage space G can prevent foreign matter accumulated on the foreign matter collection path E formed by connecting the groove portions 2 of the collection path forming members D from falling downward from between the collection path forming members D, D. In addition, the movement of the connecting pipe F disposed in the pipe storage space G in the forward and backward directions is restricted by a step 33a formed at the end of the pipe receiving portion 33.

As shown in Figures 7 and 8, the front and rear of the left and right ends of the upper surface of the water receiving portion 3 have long protrusions 35, 35 that protrude upward in the front and rear directions. 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 rise up more than necessary.

Next, we will explain how to construct a water storage structure using the collection path forming member D. First, the ground is excavated along the route connecting the water collection basin H and the sewer system, etc., to form a water storage tank B with a specified width, length, and depth. Cylindrical water collection basins H, H are placed and fixed at both ends of the water storage tank B in the longitudinal direction.

Next, a permeable sheet (not shown) is placed along the bottom and four side surfaces of the space between the water collection basins H, H in the water tank B. Then, as shown in Figures 1 and 2, the laminated member C is laid on the bottom of the water tank B with no gaps in the front-to-back 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 this base portion 11 is arranged at a predetermined interval in the left-to-right and front-to-back directions. Note that Figure 1 shows a case where multiple laminated members C are laid in a state where they are connected in series in the front-to-back direction, but only one laminated member C may be laid, or multiple laminated members C may be laid in multiple rows in the left-to-right direction. In addition, multiple types of laminated members with different lengths may be used for the laminated members D laid in the water tank B.

As shown in Figs. 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.

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 front and rear collection path forming members D1, D2 can be disposed in the manner described above with the connecting pipe F disposed between the collection path forming members D, D disposed in front and behind.

After that, other laminated members C, C... are laminated on the laminated members C, C... arranged on the bottom surface of the water tank B, and the laminated members C, C... are laminated vertically and horizontally as necessary 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 mesh plate.

When arranging collection path forming members D, D... on the top layer of laminated members C, C..., construction can be carried out in the same manner as when arranging collection path forming members D, D... on the bottom layer of laminated members C, C....

The water collection basins H arranged at both ends of the water tank B in the longitudinal direction each have inlets H1 and H2 penetrating the upper and lower parts of the wall portion facing the laminated structure A, extending between the inner and outer periphery of the water collection basins H.

The lower inlet H1, H1 of the water collection basins H, H is formed facing the open end in the longitudinal direction of the foreign matter collection path E formed by connecting the grooves 2 of multiple collection path forming members D arranged on the lowest layer of laminated member C, and the open end of the foreign matter collection path E and the lower inlet H1 of the water collection basin H are connected and communicated via a pipe body J as necessary.

Similarly, the upper inlet H2, H2 of the water collection basins H, H is formed facing the longitudinal opening end of the foreign matter collection path E formed by connecting the grooves 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 water collection basin H are connected and communicated via a pipe body J as necessary.

The water storage structure I used as a rainwater infiltration trench configured in this manner is arranged 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 of the foreign matter collection path E in the longitudinal direction are connected and communicated within the water collection basin. Therefore, rainwater that flows 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 of the foreign matter collection path E in the longitudinal direction.

Rainwater that flows 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.

Rainwater that flows 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.

No collection path forming member D is provided in the laminated members C constituting the intermediate layers other than the laminated members C constituting the top and bottom layers. In the intermediate layers of the laminated structure A, rainwater moves smoothly downwards in the laminated structure A through the water passage hole 112b in the base portion 11 of the laminated member C and the water passage hole 124 in the column portion 12.

On the other hand, 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 divided 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.

The 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 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 collection path E (groove portion 2), and accumulates and is collected in the foreign matter collection path E.

In this way, foreign matter that flows into the laminated structure A together with rainwater is accumulated and collected in the foreign matter collection path E of the collection path forming member D, so that the amount of foreign matter remaining dispersed within the laminated structure A is reduced as much as possible, and the rainwater storage volume (flow path volume) within the laminated structure A can be maintained.

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

The foreign matter collected and accumulated on the foreign matter collection path E of the collection path forming members D, D... can be removed by using the inlets H1, H2 of the water collection box H. For example, cleaning water is sprayed from the inlets H1, H2 of one of the water collection boxes H, and the foreign matter accumulated on the foreign matter collection path E is removed from the outlets H1, H2 of the other water collection box H. Since the foreign matter collection path E is formed with a smoothly curved surface over its entire length, the foreign matter accumulated on the foreign matter collection path E can be smoothly pushed from the foreign matter collection path E into the water collection box 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 collection path E from the inlets H1, H2 of one of the water collection boxes H, and the foreign matter collected on the foreign matter collection path E may be pushed to the outlets H1, H2 of the other water collection box H and removed outside the laminated structure A.

In addition, a cleaning tool for scraping out foreign matter accumulated on the foreign matter collection path E may be inserted into the foreign matter collection path E of the collection path forming members D, D, etc., and the foreign matter accumulated on the foreign matter collection path E may be pulled forward and scraped out by the cleaning tool, thereby discharging the foreign matter collected on the foreign matter collection path E out of the laminated structure A.

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, etc., and the water storage structure I has excellent maintainability.

In the above-mentioned water storage structure I, the case where water collection basins H, H are arranged at both ends of the length of the water storage tank B has been described, but it is also possible to arrange only one water collection basin H in the water storage tank B.

In addition, 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.

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 the 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.

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 the grooves of the collection path forming members are connected in series to form a foreign matter collection path.

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 penetrating the 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 grooves of the collection path forming member in series to construct a rainwater storage structure.

The laminated member C does not have to have the structure shown in Figure 3. In the laminated member of Figure 3, a plurality of independent columns 12 are integrally formed on the base, but the columns 12 may be continuous in the longitudinal direction on the base 11, rather than being independent of each other in the front-to-rear direction (see Figure 9). In such a case, the upper end of the column 12 may be formed with intermittent protrusions 13 in the longitudinal direction, and the column insertion opening 32 of the water receiving part 3 of the collection path forming member D may be fitted over the protrusions, and the collection path forming member D may be attached to the laminated member C.

2 Groove
11 Base
12 Pillar
21 Connection piece 3 Water receiving part
32 Pillar insertion hole
33 Pipe receiving portion A Laminated structure B Water tank C Laminated member D Collection path forming member E Foreign object collection path F Connection pipe G Pipe storage space portion H Water collection basin
H1 Lower inlet
H2 Upper inlet I Water storage structure J Pipe body

Claims (8)

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. The collection path forming member according to claim 1, characterized in that the water receiving portion has a column insertion opening through which the column of the laminated member is inserted. The collection path forming member according to claim 1 or 2, characterized in that the groove is formed with an arc-shaped cross section. The collection path forming member according to any one of claims 1 to 3, characterized in that the water receiving portion is inclined downward toward the groove portion. 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 multiple collection path forming members in the longitudinal direction of their grooves, and the ends of adjacent grooves are overlapped and connectable. 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. The water storage structure according to claim 6, characterized in that the water storage structure is a rainwater infiltration trench. The water storage structure according to claim 6, characterized in that the water storage structure is a rainwater storage structure.

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