JPH1161953A - Rainwater storage seepage tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent inundation at the time of a heavy rainfall on the lower side road, etc., of a grade separation. SOLUTION: A bottom wall block 11 and side wall blocks 13, 13... (a wall section) made of precast reinforced concrete are stacked vertically and sunk, bottom slab concrete 14 (a bottom section) is placed, an upper floor-slab block 16 (an upper floor section) is installed, and a storage space having specified volume corresponding to the predicted quantity of the retention of rainwater at the time of a heavy rainfall is formed under the ground. Infiltrating holes 11b, 11b... are bored to the bottom wall block 11, and crushed stone, etc., are charged onto the bottom slab concrete 14 and an infiltrating layer 15 is formed. A catch basin 19 is exposed and mounted on a ground surface 1, and connected to a storage space through a conduit 18 and an intake 13b. Rainwater on the ground surface 1 is taken in through the intake 13b, etc., and stored once in the storage space, thus draining a large quantity of rainwater from the ground surface 1. Rainwater stored in the storage space is discharged naturally by gradually infiltrating rainwater into the ground through the infiltrating holes 11b, 11b....

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rainwater storage and infiltration tank for preventing flooding of a lower road or the like at an overpass in a thunderstorm or a typhoon.

[0002]

2. Description of the Related Art In general, a road is provided with a drainage channel such as a drainage ditch, and a drainage pump is installed in a concave portion such as a lower road (underpass) of an overpass. During rainfall, rainwater on the road is drained through a drainage channel and a drainage pump.

[0003]

[Problems to be solved by the invention] Thunderstorm, typhoon, etc.
If the drainage capacity of the drainage channel and drainage pump exceeds the drainage capacity due to a large amount of rainfall in a short time, or if the drainage pump does not operate due to a power failure due to a lightning strike, the road will be flooded. There was a problem that traffic was completely cut off temporarily at the concave part.

The present invention has been made in view of such a conventional problem,
It is an object of the present invention to provide a rainwater storage and infiltration tank capable of suitably preventing flooding of a lower road or the like at an overpass.

[0005]

SUMMARY OF THE INVENTION The features of the present invention for solving the conventional problems as described above and achieving the intended purpose are as follows.
A wall that forms a storage space of a predetermined volume corresponding to the expected amount of rainwater accumulated on a lower road or the like of an overpass, a top floor and a bottom, and the wall or the top floor communicates with the storage space. A hole is provided, and a permeation hole communicating with the storage space is provided in the wall portion or the bottom portion, and buried underground, rainwater accumulated on the ground surface is taken in through the water intake hole to take in the storage space. And the rainwater stored in the storage space penetrates into the ground through the permeation hole.

It is preferable that the wall is formed by vertically stacking and sinking a cylindrical bottom wall block and a side wall block made of precast reinforced concrete. In addition, it is preferable that the bottom wall block is formed such that the outer shape of the lower end portion is larger than the outer shape of the upper portion, so that friction at the time of subsidence is reduced. Further, it is preferable that the bottom wall block or the side wall block is provided with a large number of recesses for permeation holes that form perforation holes by breaking after being set up.

[0007]

Embodiments of the present invention will now be described with reference to the drawings. In the figure, reference numeral 10 denotes a rainwater storage and infiltration tank, and the rainwater storage and infiltration tank 10 includes a bottom wall block 11, a plurality of side wall blocks 13, 13,.
It is composed of an upper floor block 16 and a human hole block 17, and has a bottom wall block 11, side wall blocks 13, 13
…, The upper slab block 16 and the manhole block 17 are made of precast reinforced concrete,
4 is made of cast-in-place concrete.

The bottom wall block 11, the side wall blocks 13, 1
1, are formed into a substantially cylindrical shape having substantially the same diameter as shown in FIG. 1, and are formed into a wall portion by being stacked up and down to form a substantially disc-shaped bottom slab concrete 1 forming a bottom portion.
4. Together with the substantially disk-shaped upper floor slab block 16 constituting the upper slab, a substantially cylindrical storage space is formed, and the storage space is determined by the stacking number of the side wall blocks 13, 13,. A predetermined volume of space is ensured. Note that the volume of the storage space only needs to be equal to or larger than the expected amount of accumulated rainwater at the installation location.

Then, at the lower end of the bottom wall block 11,
The cutting edge 12 is provided, and by excavating the ground on the inner peripheral side of the bottom wall block 11, the bottom wall block 11, the side blocks 13, 13,.
Further, the outer diameter of the lower end of the bottom wall block 11 is formed to be slightly larger than the outer diameter of the upper part.
The friction of the side blocks 13, 13,... Is reduced.

Also, as shown in FIG.
In the lower inner peripheral surface of No. 1, inserts 11c for bottom plate reinforcing arrangement, 1
1c are buried, and the reinforcing bars 14a of the bottom slab concrete 14 are connected. Are provided on the outer peripheral surface of the upper portion of the bottom wall block 11, and after being laid down, the flat portions (rear portions) of the concave portions 11a, 11a. Thereby, penetration holes 11b, 11b ... penetrating the bottom wall block 11 in and out are formed.

Also, as shown in FIG.
3 is provided with a water intake hole recess 13a on the outer peripheral surface thereof. 13b is formed, and the water pipe 18 is connected. The upper floor slab block 16 is provided with a manhole 16a for management, and a substantially cylindrical manhole block 17 is connected thereto.

[0012] The construction of the rainwater storage and infiltration tank 10 is firstly performed as shown in FIG.
As shown in (1), excavation is performed from the ground surface 1 (road surface) to a predetermined reference surface 2, and a bottom wall block 11 is installed on the reference surface 2 as shown in FIG. Then, the inner peripheral side of the bottom wall block 11 is excavated by the bucket type excavator 20 or the like, and the bottom wall block 11 is lowered. And, as shown in FIG.
The side wall blocks 13 are stacked on the bottom wall block 11, the inner peripheral side of the bottom wall block 11 is excavated and settled, and the side wall blocks 13, 13... Are sequentially stacked, and as shown in FIG. The bottom wall block 11 is lowered to a depth at which the storage space is formed.

[0013] Then, the bottom of the excavation is leveled with a floor, the foundation rock is spread, leveled, compacted, and leveled concrete is poured.
The bottom slab concrete 14 is cast on it and cured.
Then, the recesses 11a, 11 for the penetration holes of the bottom wall block 11 are formed.
a ... are punched out to form perforation holes 11b, 11b,.
As shown in (1), sand, crushed stone and the like are put on the bottom slab concrete 14 to form a permeation layer 15 on the inner peripheral side of the bottom wall block 11.

Further, the water intake hole recess 13a of the uppermost side wall block 13 is punched out to open a water intake hole 13b, and the water collecting basin 19 is installed at the lowest place on the ground surface 1 so as to be exposed. A water pipe 18 is laid between the water and the rainwater storage / penetration tank 10, and the water pipe 18 is connected to the rainwater storage / penetration tank 10 through the water hole 13 b. Then, the upper slab block 16 and the human hole block 17 are set and buried on the uppermost side wall block 13. The management ladder 17a is attached to the inner wall surface of the side wall blocks 13, 13,.

By embedding the rainwater storage and infiltration tank 10 underground, a storage space of a predetermined volume is formed underground, and when rainfall occurs, the rainwater on the ground surface 1 is collected by the water collecting basin 19 and the water pipe 18. , Is guided to the underground storage space through the water intake hole 13b, and the rainwater in the storage space penetrates into the ground through the permeation holes 11b, 11b.

When a large amount of rainfall occurs in a short period of time, such as during a thunderstorm or a typhoon, even if a large amount of rainwater flows into the storage space and exceeds the amount of infiltration into the ground, the storage space having a predetermined volume can be obtained. The rainwater on the ground surface 1 can be drained appropriately. Then, since the stored large amount of rainwater gradually permeates into the ground and is naturally discharged from the storage space, there is no need to provide a discharge pump or the like, and maintenance and management become easy.

Therefore, as shown in FIG. 7, by installing a rainwater storage and infiltration tank 10 on the lower road 5 of a grade separation consisting of a lower road 5 and an upper road 6 (or a railway), a thunderstorm or a typhoon can be prevented. At this time, it is possible to preferably prevent the concave lower road 5 from being flooded. The rainwater storage and infiltration tank 10
Can be installed in one lane of the two-lane lower road 5, since the bottom wall block 11, the side wall blocks 13, 13 ... are stacked and formed vertically to secure a predetermined volume of the storage space. The impact on traffic inside can be minimized.

It is sufficient that the storage space has a volume equal to or larger than the expected amount of rainwater retained at the installation location. For example, when the storage space is installed in a recessed portion having a width of 8 m and a length of 100 m,
Assuming that the rainfall of 50 mm / hour continues for 60 minutes, the expected amount of accumulated rainwater is about 40 m ^3. Therefore, if the inside diameter of the storage space (side wall block) is 3.0 m, the height may be 5.7 m or more. I just need. In addition, not only the expected rainfall amount at the installation location but also the estimated inflow amount of rainwater from the surroundings may be included in the estimated rainwater accumulation amount.

[0019]

As described above, the rainwater storage and infiltration tank according to the present invention has a wall, an upper floor, and a wall that form a storage space of a predetermined volume corresponding to the expected amount of rainwater to accumulate on a lower road or the like at a grade separation. Provided with a bottom, provided with a water intake hole communicating with the storage space on the wall or upper floor, provided with a permeation hole with the storage space on the wall or bottom, and buried underground to collect rainwater accumulated on the ground surface The rainwater stored in the storage space is taken in through the reservoir, and the rainwater stored in the storage space is configured to penetrate into the ground through the permeation holes, so that the amount of rainwater flowing from the ground surface during heavy rain Even if the amount exceeds the amount of infiltration into the ground, a large amount of rainwater can be temporarily stored in the storage space, so that the rainwater on the ground surface can be drained appropriately. As it penetrates inside and is discharged naturally, there is no need for a discharge pump etc. It can be easily maintained.

In addition, by forming the wall portion by vertically stacking and lowering a cylindrical bottom wall block and a side wall block made of precast reinforced concrete, a storage space having a predetermined volume can be suitably formed. It can be suitably buried underground. Then, the bottom wall block can be more preferably buried underground by forming the lower outer shape larger than the upper outer shape and reducing the friction at the time of laying. In addition, by providing the bottom wall block or the side wall block with a large number of recesses for permeation holes that form perforation holes by breaking after being set up, permeation holes for permeating rainwater into the ground can be suitably formed.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of a rainwater storage and infiltration tank according to the present invention.

FIG. 2 is a longitudinal sectional view showing a construction method of the rainwater storage and infiltration tank of FIG.

FIG. 3 is a longitudinal sectional view showing a method of constructing the rainwater storage and infiltration tank of FIG.

FIG. 4 is a longitudinal sectional view showing a method of constructing the rainwater storage and infiltration tank shown in FIG.

FIG. 5 is a longitudinal sectional view showing a method of constructing the rainwater storage and infiltration tank of FIG. 1;

FIG. 6 is an enlarged view of a bottom slab concrete part of FIG. 5;

7A and 7B are a longitudinal sectional view and a plan view, respectively, showing an example in which the rainwater storage and infiltration tank shown in FIG. 1 is applied to a lower road of a grade separation.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ground surface (road surface) 2 Construction reference surface 5 Lower road 6 Upper road 10 Rainwater storage / penetration tank 11 Bottom wall block (wall part) 11a Recess for penetration hole 11b Penetration hole 11c Insert for bottom plate reinforcement arrangement 12 Blade port 13 Side wall block (Wall) 13a Water intake hole recess 13b Water intake hole 14 Slab concrete (bottom) 14a Reinforcement 15 Permeated layer 16 Upper floor slab block (upper floor) 16a Management manhole 17 Manhole block 17a Management ladder 18 Water pipe 19 Water collecting basin 20 bucket type excavator

Claims (4)

[Claims] 1. A storage system comprising a wall, an upper floor, and a bottom forming a storage space having a predetermined volume corresponding to an expected amount of accumulated rainwater on a lower road or the like of a grade separation, wherein the storage is provided on the wall or the upper floor. A water intake hole communicating with the space is provided, a permeation hole communicating with the storage space is provided at the wall or the bottom, and rainwater buried underground and stagnant on the ground surface is taken in through the water intake hole. A rainwater storage and infiltration tank for storing in the storage space and infiltrating rainwater stored in the storage space into the ground through the permeation hole. 2. The rainwater storage and infiltration tank according to claim 1, wherein the wall portion is formed by vertically stacking and depositing a cylindrical bottom wall block and a side wall block made of precast reinforced concrete. 3. The rainwater storage and infiltration tank according to claim 2, wherein the bottom wall block is formed such that the outer shape of a lower end portion is larger than the outer shape of an upper portion, and friction at the time of sinking is reduced. 4. The rainwater storage and infiltration tank according to claim 2, wherein the bottom wall block or the side wall block is provided with a large number of infiltration hole recesses that form perforation holes by breaking after being set.