JP4625989B2 - Rainwater collection facility - Google Patents
Rainwater collection facility Download PDFInfo
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- JP4625989B2 JP4625989B2 JP2004227684A JP2004227684A JP4625989B2 JP 4625989 B2 JP4625989 B2 JP 4625989B2 JP 2004227684 A JP2004227684 A JP 2004227684A JP 2004227684 A JP2004227684 A JP 2004227684A JP 4625989 B2 JP4625989 B2 JP 4625989B2
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- rainwater
- storage
- weir
- rainwater accumulation
- accumulation facility
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- 238000009825 accumulation Methods 0.000 claims description 37
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- 239000002689 soil Substances 0.000 claims description 13
- 239000004576 sand Substances 0.000 claims description 10
- 230000007423 decrease Effects 0.000 claims description 2
- 238000004062 sedimentation Methods 0.000 claims 1
- 238000001914 filtration Methods 0.000 description 13
- 238000010586 diagram Methods 0.000 description 11
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 238000007667 floating Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 229910021536 Zeolite Inorganic materials 0.000 description 2
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 239000010457 zeolite Substances 0.000 description 2
- 235000013361 beverage Nutrition 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 239000003651 drinking water Substances 0.000 description 1
- 235000020188 drinking water Nutrition 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 238000011328 necessary treatment Methods 0.000 description 1
- 239000002985 plastic film Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 210000003462 vein Anatomy 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/108—Rainwater harvesting
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- Sewage (AREA)
Description
本発明は、雨水の有効利用を目的とする雨水集積施設技術に属する。 The present invention belongs to rainwater accumulation facility technology for the effective use of rainwater.
雨水を有効利用を目的とする雨水貯留技術の一つとして、山の斜面の麓に溜池を掘り山の斜面に降った雨水を集めることが古来より行われている。
またちいさな火山島などでは地下水脈はなく、河も雨が降った時だけ流れる程度のものでしかないため雨水を雨樋などで集め生活用水として蓄え使用している。
As one of the rainwater storage technologies for the effective use of rainwater, it has been practiced since ancient times to dig a reservoir at the foot of the mountain slope and collect the rainwater that fell on the mountain slope.
On small volcanic islands, etc., there are no underground water veins, and rivers can only flow when it rains, so rainwater is collected in rain gutters and stored for daily use.
雨季と乾季がはっきりと分かれる地域では、雨季に蓄えた水を計画的に使用するか、河川の水に依存するよりない。河川も大河であれば乾季においても水の流れが絶えることはないが中小の河川にあっては乾季の間に干上がり水不足に陥る。
このような地方では井戸に頼ることとなるがこれも乾季の間には水量の不足、水質の悪化などで十分ではない。
In areas where the rainy season and the dry season are clearly separated, the water stored in the rainy season is used systematically or depends on river water. If the river is a large river, the flow of water will not be interrupted even in the dry season, but in the case of small and medium-sized rivers, there will be a shortage of dry water during the dry season.
In such regions, it depends on wells, but this is not sufficient during the dry season due to lack of water and deterioration of water quality.
一方雨水の貯留タンクはコンクリート製の地下タンクが一般的であるが、小型のプラスチック製などの貯留部材を地下に配設し、その周囲を非透水性のシートで覆い貯留空間を確保する方法が、その施工の容易性と施工期間の短縮などの利点から普及してきている。これら貯留部材を利用した雨水貯留方法は下記の特許公報に開示されている。
本発明は、雨水を効率よく浄化しながら集積する手段の提案である。 The present invention is a proposal of means for collecting rainwater while purifying it efficiently.
本第1の発明は、雨水集積施設であって、当該雨水集積施設は、地表部から底部に向かって非透水性の傾斜面を形成し、最下部に貯留部を設け、当該貯水部を透水性土壌で被覆して雨水集積部とし、前記傾斜面の透水性土壌で被覆されない最上部に内側に向かって波紋状に構成された波状の堰を設け、当該堰は順次その頂点が雨水集積部の中心に向かって低くなり、前記堰の谷間に砂泥を沈砂させることにより雨水に伴う土砂の流入を防止し、透水性土壌を介して貯留部に雨水を流入させる雨水集積施設である。流入する雨水中に含まれる土砂を除去するため、雨水集積部の周囲に波状の堰を設け土砂を堰間に沈殿させる。
本第2の発明は、雨水集積施設の貯留部に下記に示す貯留部材のいずれか単独でもしくは組み合わせて充填した雨水集積施設である。
１．透孔を有する平板を組み合わせて得られる箱状もしくは容器状部材。
２．透孔を有する平板部と平板部に連結する筒部とからなる部材。
３．表面に透孔を有する筒状部材。
４．平行に設けられた透孔を有する2枚の平板を筒状部材で連結した部材。
５．表面に透孔を有する波板部材。
雨水を効率よく貯留するため貯留率の高い各種貯留部材を用いて貯留効率を向上する。
また、これら貯留部材は軽量なため人力で施工でき、工期も短くなる。
The first aspect of the present invention is a rainwater accumulation facility, wherein the rainwater accumulation facility forms a non-permeable inclined surface from the surface portion toward the bottom, a storage portion is provided at a lowermost portion, and the water storage portion is permeable to water. A rainwater accumulating section is formed by covering with a soil, and a corrugated weir constructed in a ripple shape toward the inside is provided on the uppermost portion of the inclined surface that is not covered with the water-permeable soil. This is a rainwater accumulation facility that is lowered toward the center of the dam and prevents inflow of earth and sand accompanying rainwater by sinking sand and mud between the valleys of the weirs, and allows rainwater to flow into the storage section through the permeable soil . In order to remove the earth and sand contained in the inflowing rainwater, a corrugated weir is provided around the rainwater accumulating portion to deposit the earth and sand between the weirs.
The second aspect of the present invention is a rainwater accumulation facility in which a storage section of a rainwater accumulation facility is filled with any of the following storage members alone or in combination.
1. A box-like or container-like member obtained by combining flat plates having through holes.
2. A member comprising a flat plate portion having a through hole and a cylindrical portion connected to the flat plate portion.
3. A cylindrical member having a through hole on the surface.
4). A member in which two flat plates having through holes provided in parallel are connected by a cylindrical member.
5. A corrugated member having a through hole on the surface.
In order to efficiently store rainwater, the storage efficiency is improved using various storage members having a high storage rate.
Moreover, since these storage members are lightweight, they can be constructed manually and the construction period is shortened .
本発明は、雨水を集積部に導入するに当たり、雨水の流入路に波型の堰を設け雨水中に存在する土砂などの懸濁物が堰間に沈殿し除去されて雨水集積部に流入する。そのため、集積した雨水の清浄性を高めることができる。
貯留部内に貯留部材に充填したため貯留部の貯留効率が向上する。
In the present invention, when introducing rainwater into the accumulation section, a corrugated weir is provided in the rainwater inflow passage, and suspended matters such as earth and sand existing in the rainwater are settled and removed between the weirs and flow into the rainwater accumulation section. . Therefore, the cleanliness of accumulated rainwater can be improved.
Since the storage member is filled in the storage part, the storage efficiency of the storage part is improved.
以下本発明を図により詳細に説明する。
図1は本第１の発明における雨水集積施設の基本概念を示す図である。
本発明の目的は、雨水集積部上空に降った雨水も直接透水性の土壌を介して雨水貯留部に貯留すると同時に、山や丘の斜面あるいは道路上に降った雨水を導水路に導き雨水集積部に受け入れるものである。
そのため浸透性土壌の下部には非透水性の層を設け集まった雨水が非透水性層上に貯まるようになっている。非透水性層は粘土でもよいがゴムシートあるいはプラスチック製のシートなどがその取り扱いが容易なため好ましい。
周辺に降った雨水は雨水集積部の周囲に設けられた波状の堰を超えて雨水集積部に流れ込み浸透性の土壌を通って濾過されながら最下部に設けた雨水貯留部に集積される。
波状の堰は波型で順次その頂点の高さが雨水集積部に向かって低下するように構成されている。土砂を含む雨水は波状の頂部の一つを超えるたびに含有する土砂を波状の堰の谷間に沈殿させ、清浄化され雨水集積部の上部に流れ込む。波状の堰は雨水集積施設の周囲から内側に向かって波紋状に構成されていても、雨水集積部の周囲に設けたらせん状の流路の流れ方向に直角に設けてもよい。波状の堰を構成する波の形状も凹部と凸部が交互に現れる形状を取れれば凹部と凸部の形状は問わない。流れ方向に対し順次その凸部の高さが減少するように構成されていればよい。
必要に応じて雨水集積施設上部の周辺部にさらに壁状の堰あるいは柵を設け浮遊性のごみを雨水集積部の周辺部に集め除去することもできる。壁状の堰はらせん状に中心部まで延ばし浮遊性のごみを一箇所に集めることでもよい。
本雨水集積施設は地下を掘削して設けてもよいが、谷間を利用して形成することでもよい。あるいは道路の分離帯の下に設け、道路上の雨水を集めるものでもよい。
Hereinafter, the present invention will be described in detail with reference to the drawings.
FIG. 1 is a diagram showing a basic concept of a rainwater accumulation facility in the first invention.
The purpose of the present invention is to store rainwater that has fallen over the rainwater accumulation part directly in the rainwater storage part through the permeable soil, and at the same time, bring rainwater that has fallen on the slopes of mountains and hills or roads to the waterway and collect rainwater. It is what you accept in the department.
For this reason, a non-permeable layer is provided at the bottom of the permeable soil so that the collected rainwater is stored on the non-permeable layer. The water-impermeable layer may be clay, but a rubber sheet or a plastic sheet is preferable because it is easy to handle.
Rainwater that falls on the periphery is integrated in the rainwater reservoir provided at the bottom while beyond the wavy weir provided around filtered through a permeable soil flow into the rainwater accumulation of rain water collecting section.
The corrugated weir is corrugated and is configured such that the height of its apex gradually decreases toward the rainwater accumulation part . Every time the rainwater containing earth and sand exceeds one of the wave-like tops , the earth and sand contained therein is settled in the valleys of the wave-like weirs, cleaned and flows into the upper part of the rainwater accumulation part . The corrugated weir may be formed in a ripple shape from the periphery of the rainwater accumulation facility to the inside, or may be provided at right angles to the flow direction of the spiral flow path provided around the rainwater accumulation portion . The shape of the wave forming the wavy weir does not matter as long as the concave and convex portions appear alternately. What is necessary is just to be comprised so that the height of the convex part may reduce sequentially with respect to a flow direction.
If necessary, a wall-like weir or fence can be further provided around the upper part of the rainwater accumulation facility to collect and remove floating waste around the rainwater accumulation part. The wall-like weir may be spirally extended to the center to collect floating dust in one place.
This rainwater accumulation facility may be provided by excavating underground, but may also be formed using a valley. Alternatively, it may be provided under a road separation zone to collect rainwater on the road.
図２は、本発明にかかわる雨水集積施設の他の概念を示す図である。図示するように貯留部に下記の貯留部材を充填したものである。これは道路の中央分離帯などに設け路面上に降った雨を側溝などで集め直接雨水取入口から施設内に受け入れることを考慮した雨水集積施設である。
１．透孔を有する平板を組み合わせて得られる箱もしくは容器状部材。
２．透孔を有する平板部と平板部に開口する筒部とからなる部材。
３．表面に透孔を有する筒状部材。
４．平行に置かれた２枚の透孔を有する平板を筒で結合した部材。
５．表面に透孔を有する波板部材である。
上記貯留部材は図８に示されている。いずれも図９に示すように上下左右に配置可能とされその配置物が雨水を貯留する貯留空間を確保するものである。透水性土壌と貯留部材で構成される貯留部との間には土砂が入り込まないよう透水性のシートを敷き設する。また使用する貯留部材によっては適宜壁材を用いて配置物の大きな開口部を壁材などで塞ぐ必要がある。これら貯留部材の材質、形状、大きさなどはプラスチック製あるいはステンレススチール製等耐久性、強度、取り扱いの容易性などを考慮して決めることができる。
FIG. 2 is a diagram showing another concept of the rainwater accumulation facility according to the present invention . As shown in the figure, the storage part is filled with the following storage member. This is a rainwater collection facility that is installed in the median strip of the road, etc., taking into account that rain that has fallen on the road surface is collected by a gutter and received directly from the rainwater intake.
1. A box or container-like member obtained by combining flat plates having through holes.
2. A member comprising a flat plate portion having a through hole and a cylindrical portion opened to the flat plate portion.
3. A cylindrical member having a through hole on the surface.
4). A member in which a flat plate having two through holes placed in parallel is connected by a cylinder.
5. It is a corrugated plate member having a through hole on the surface.
It said storage member is shown in FIG. In any case, as shown in FIG. 9 , it can be arranged vertically and horizontally, and the arranged object secures a storage space for storing rainwater. A water-permeable sheet is laid between the water-permeable soil and the storage part constituted by the storage member so that earth and sand do not enter. Further, depending on the storage member to be used, it is necessary to appropriately close the large opening of the arrangement with a wall material or the like using a wall material . The material, shape, size, and the like of these storage members can be determined in consideration of durability such as plastic or stainless steel, strength, and ease of handling.
図3は、本発明に係る雨水集積施設の他の概念を示す図である。
貯留部材にて形成される貯留部の周辺部を構成する貯留部材の隙間に濾過部材を充填したものである。濾過部材は繊維マット、繊維製のひもを束ねたもの、あるいは木炭、活性炭、ゼオライト、砕石、貝殻などが使用され透水性の土壌により濾過し切れない細かな粒子を除去するものである。あるいは後述するように土壌を経由しないで直接雨水集積施設に受け入れる場合に効果を発揮するものである。濾過部材は、その機能が失われた時点で雨水集積施設を掘り起こし再充填することができる。
濾過部材は使用する貯留部材が箱状もしくは容器状のものであれば、その内部に充填して使用する。平板と筒部からなる部材はその筒部を互に向き合わせあるいは2枚の板材を筒状部材で連結したものでは平板間にひも状あるいは繊維状の濾過部材をかけて使用できる。その他筒状部材、波板状部材では活性炭、ゼオライトなど粒子状の濾過部材をネットなどに包みその隙間に充填して使用できる。
FIG. 3 is a diagram showing another concept of the rainwater accumulation facility according to the present invention .
The filtration member is filled in the gap between the storage members that form the periphery of the storage part formed by the storage member. The filter member is a fiber mat, a bundle of fiber strings, or charcoal, activated carbon, zeolite, crushed stone, shells and the like, and removes fine particles that cannot be filtered by water-permeable soil. Or, as will be described later, it is effective when it is directly received by a rainwater accumulation facility without passing through the soil. The filtering member can dig up and refill the rainwater collection facility when its function is lost.
If the storage member to be used is a box or container, the filtration member is used by filling the inside thereof. A member composed of a flat plate and a cylindrical portion can be used by placing a string-like or fibrous filtering member between the flat plates in the case where the cylindrical portions face each other or two plate members are connected by a cylindrical member. Other cylindrical members and corrugated plate members can be used by wrapping a particulate filter member such as activated carbon or zeolite in a net or the like and filling the gap.
図4は、雨水集積施設の周辺から流入する雨水を直接貯留部材で形成される貯留部に導入するものである。多量の水が直接入るよう前記貯留部の周辺部分に存在する貯留部材には濾過部材を充填せず貯留空間として確保する。すなわち貯留部材からなる貯留部を３段に区画し、上層部を一時貯留空間、中層部を濾過空間、下層部を貯留空間とするものである。 FIG. 4 shows that rainwater flowing in from the vicinity of the rainwater accumulation facility is directly introduced into a storage portion formed by a storage member. The storage member existing in the peripheral portion of the storage unit is not filled with a filtering member so that a large amount of water directly enters, and is secured as a storage space. That is, the storage part which consists of a storage member is divided into three steps, the upper layer part is used as a temporary storage space, the middle layer part is used as a filtration space , and the lower layer part is used as a storage space.
図５は、貯留空間を複数に分割しそれぞれその利用分野を変えるものである。例えば雑用水、必要な処理を加えて飲料用とするなどである。 FIG. 5 shows a case where the storage space is divided into a plurality of areas and their fields of use are changed. For example, miscellaneous water and necessary treatments are added for beverages.
図6は、貯留部を複数に区画し、各区画に最終貯留部に通じる濾過部材の量を変化させたものである。貯留部Ａには十分に濾過された水が貯留され、必要な処理を経て飲料水などに使用されるものである。貯留部Ｂ，Ｃとその途中の濾過部材の量が減少するようになっており、貯留部Ｃに貯留された雨水は例えば雑用に供される。あるいは同じような結果が得られるよう、種類の異なる濾過部材を充填してもよい。 FIG. 6 shows the storage section divided into a plurality of sections and the amount of the filtration member leading to the final storage section is changed in each section . Water that has been sufficiently filtered is stored in the storage part A, and is used for drinking water or the like after undergoing necessary processing. The quantity of the storage parts B and C and the filtration member in the middle reduces, and the rainwater stored by the storage part C is provided for a chore, for example. Alternatively, different types of filtering members may be filled so that the same result can be obtained.
図7は、貯留部を大きく2分し、その境界に循環可能な濾過シートを介在させた雨水集積施設である。濾過シートの前方に当たる貯留部に雨水を受け入れ、濾過シートで相対的に粗大な浮遊物を濾別し、その後方を清浄な雨水の貯留部としたものである。図では濾過シートの後方に属する貯留部には前述した濾過部材を貯留部の周辺部に存在する貯留部材の空間に充填してさらに浄化した雨水を貯留する貯留部を設けている。このように途中濾過シートを設けることで濾過部材の寿命を延ばすことができる。
また濾過シートは地上部まで引き上げ、そこで洗浄し濾過シートを再生することで濾過シートの寿命も延ばすことが可能となっている。濾過シートは一般土木用に使用されている保護シート類を利用することが可能である。
上記発明は単独あるいは組み合わせて使用することができる。
FIG. 7 shows a rainwater accumulation facility in which the storage part is largely divided into two and a circulating filter sheet is interposed at the boundary. Rainwater is received in the storage part which hits the front of the filter sheet, relatively coarse floating matters are filtered off by the filter sheet, and the rear part is used as a clean rainwater storage part . In the figure, the storage part belonging to the rear of the filter sheet is provided with a storage part for storing the purified rainwater by filling the space of the storage member existing in the peripheral part of the storage part with the filtration member described above. Thus, the lifetime of a filtration member can be extended by providing a filtration sheet in the middle.
Also, the filter sheet can be lifted to the ground, washed there, and regenerated, thereby extending the life of the filter sheet. The filter sheet can use protective sheets used for general civil engineering.
The above inventions can be used alone or in combination.
１ 雨水集積施設
２ 透水性土壌
３ 波状堰
４ 非透水層
５ 壁状堰
６ 貯留部材
７ 貯留部
８ 濾過部材
９ 透水シート
10 雨水取入口
11 循環型濾過シート
DESCRIPTION OF
10 Rainwater intake
11 Circulating filter sheet
Claims (2)
１．透孔を有する平板を組み合わせて得られる箱状もしくは容器状部材。
２．透孔を有する平板部と平板部に連結する筒部とからなる部材。
３．表面に透孔を有する筒状部材。
４．平行に設けられた透孔を有する2枚の平板を筒状部材で連結した部材。
５．表面に透孔を有する波板部材。 2. A rainwater accumulation facility according to claim 1, wherein the storage part of the rainwater accumulation facility according to claim 1 is filled with any of the following storage members alone or in combination.
1. A box-like or container-like member obtained by combining flat plates having through holes.
2. A member comprising a flat plate portion having a through hole and a cylindrical portion connected to the flat plate portion.
3. A cylindrical member having a through hole on the surface.
4). A member in which two flat plates having through holes provided in parallel are connected by a cylindrical member.
5. A corrugated member having a through hole on the surface.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004227684A JP4625989B2 (en) | 2004-08-04 | 2004-08-04 | Rainwater collection facility |
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| JP2004227684A JP4625989B2 (en) | 2004-08-04 | 2004-08-04 | Rainwater collection facility |
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| JP2006045883A JP2006045883A (en) | 2006-02-16 |
| JP4625989B2 true JP4625989B2 (en) | 2011-02-02 |
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| JP2004227684A Active JP4625989B2 (en) | 2004-08-04 | 2004-08-04 | Rainwater collection facility |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP5992710B2 (en) * | 2012-03-29 | 2016-09-14 | タキロン株式会社 | Filling material for underground water tank |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5049256U (en) * | 1973-08-31 | 1975-05-14 | ||
| JPH0457816B2 (en) * | 1990-09-26 | 1992-09-14 | Haneda Konkuriito Kogyo Kk | |
| JPH10131241A (en) * | 1996-10-30 | 1998-05-19 | Takiron Co Ltd | Stack member used for underground water storage tank |
| JPH10266277A (en) * | 1997-03-25 | 1998-10-06 | Morimoto:Kk | Rainwater catchement device |
| JP2000213015A (en) * | 1998-10-26 | 2000-08-02 | Tootetsu:Kk | Wide area catchment type underground water storage tank |
| JP2001323520A (en) * | 2000-05-15 | 2001-11-22 | Murakami Shokai:Kk | Water storage system |
-
2004
- 2004-08-04 JP JP2004227684A patent/JP4625989B2/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5049256U (en) * | 1973-08-31 | 1975-05-14 | ||
| JPH0457816B2 (en) * | 1990-09-26 | 1992-09-14 | Haneda Konkuriito Kogyo Kk | |
| JPH10131241A (en) * | 1996-10-30 | 1998-05-19 | Takiron Co Ltd | Stack member used for underground water storage tank |
| JPH10266277A (en) * | 1997-03-25 | 1998-10-06 | Morimoto:Kk | Rainwater catchement device |
| JP2000213015A (en) * | 1998-10-26 | 2000-08-02 | Tootetsu:Kk | Wide area catchment type underground water storage tank |
| JP2001323520A (en) * | 2000-05-15 | 2001-11-22 | Murakami Shokai:Kk | Water storage system |
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| JP2006045883A (en) | 2006-02-16 |
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