JP2830560B2 - Final cover method at waste disposal site - Google Patents
Final cover method at waste disposal siteInfo
- Publication number
- JP2830560B2 JP2830560B2 JP3332930A JP33293091A JP2830560B2 JP 2830560 B2 JP2830560 B2 JP 2830560B2 JP 3332930 A JP3332930 A JP 3332930A JP 33293091 A JP33293091 A JP 33293091A JP 2830560 B2 JP2830560 B2 JP 2830560B2
- Authority
- JP
- Japan
- Prior art keywords
- water
- permeable
- sheet
- waste
- gas
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000002699 waste material Substances 0.000 title claims description 27
- 238000000034 method Methods 0.000 title claims description 9
- 239000000463 material Substances 0.000 description 29
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 12
- 239000002689 soil Substances 0.000 description 7
- 101150054854 POU1F1 gene Proteins 0.000 description 5
- 239000012466 permeate Substances 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- 102000001999 Transcription Factor Pit-1 Human genes 0.000 description 1
- 108010040742 Transcription Factor Pit-1 Proteins 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000000855 fermentation Methods 0.000 description 1
- 230000004151 fermentation Effects 0.000 description 1
- 239000004745 nonwoven fabric Substances 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000013022 venting Methods 0.000 description 1
- 238000013316 zoning Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B1/00—Dumping solid waste
Landscapes
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
- Processing Of Solid Wastes (AREA)
Description
【０００１】[0001]
【産業上の利用分野】この発明は、廃棄物投棄ピット内
に発生するガスの圧力による遮水シートの浮き上がりや
破断を防止するための廃棄物処分場における最終覆土工
法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a final soil covering method in a waste disposal site for preventing floating or breakage of a water-impervious sheet due to pressure of gas generated in a waste dumping pit.
【０００２】[0002]
【従来の技術】廃棄物処分場にあっては、所定の廃棄ピ
ットの内部に廃棄物を埋立て、廃棄物の層がある程度の
厚みになった段階で表面を覆土する作業を交互に繰返
し、その積層物が地表面のある高さまで到達すると、最
終的な覆土工事を行い、上部を公園などの施設に利用し
ている。2. Description of the Related Art In a waste disposal site, a process of burying waste in a predetermined disposal pit and covering the surface when the waste layer has a certain thickness is alternately repeated. When the laminate reaches a certain height above the ground surface, final earth covering work is performed and the upper part is used for facilities such as parks.
【０００３】この最終覆土工事は、簡便な方法としては
覆土のみで済まされる場合もあるが、これだけでは雨水
などがピット内部にしみこんで汚染水となり、地下に浸
透して水源を汚染する惧れがあるため、一般には遮水シ
ートを敷設して雨水の浸透を防止している。[0003] In this final covering work, as a simple method, there is a case where only covering is enough, but there is a possibility that rainwater or the like permeates into the pit and becomes contaminated water and permeates underground to contaminate a water source. For this reason, generally, a waterproof sheet is laid to prevent the penetration of rainwater.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、廃棄ピ
ット内部は廃棄物中の有機物の醗酵分解などにより、メ
タンガスなどが発生し易く、表面を遮水シートで覆った
場合には、そのガスの抜け道ができず、地盤表面の***
や爆発などの惧れがあった。したがって、従来では前記
遮水シートを貫通して廃棄ピット上にガス抜き用の通気
パイプを所々に立設し、これを通じて排気していたが、
局所的な排気しかできず、面積の広い処分場ではガス圧
によって遮水シートが浮き上がったり、破断する例も報
告されていた。However, methane gas and the like are easily generated in the waste pit due to fermentation and decomposition of organic matter in the waste, and when the surface is covered with a water-blocking sheet, the gas escapes. It was not possible, and there was a fear of uplift and explosion of the ground surface. Therefore, in the past, vent pipes for venting gas were erected in some places on the disposal pit through the water-impervious sheet, and exhaust was performed through this.
It has been reported that only water can be exhausted locally, and the impermeable sheet rises or breaks due to gas pressure in a large repository.
【０００５】この発明は、以上の問題を解決するもの
で、通気性遮水シートによりガス抜きを充分に行えると
ともに、水の廃棄物内への浸透を防止できるようにした
廃棄物処分場における最終覆土工法を提供することを目
的としている。[0005] The present invention solves the above-mentioned problems, and a gas-permeable water-permeable sheet can sufficiently release gas and prevent water from penetrating into the waste. The purpose is to provide earth covering method.
【０００６】[0006]
【課題を解決するための手段】前記目的を達成するた
め、この発明に係る廃棄物処分場における最終覆土工法
は、廃棄物投棄ピット内に埋め立てられた廃棄物の最上
部を、非通気性遮水シートと、該非通気性遮水シートに
格子状に接ぎ合わされる通気性遮水シートとで被覆する
ものである。In order to achieve the above-mentioned object, a final covering method in a waste disposal site according to the present invention comprises a non-breathable shielding of the uppermost portion of the waste buried in the waste dumping pit. Water sheet and the non-breathable waterproof sheet
It is covered with a breathable water-blocking sheet joined in a lattice .
【０００７】[0007]
【作用】前記の構成によれば、廃棄ピットから生じたガ
スは通気性遮水シートを通じて大気側に放出される。こ
の通気性遮水シートの耐水圧力は耐空気圧力に比べて極
めて高い、すなわち通気性を有する一方ほぼ不透水性で
あるため、雨水などがシートを通じて内部に浸透するこ
とがない。According to the above arrangement, the gas generated from the waste pit is discharged to the atmosphere through the air-permeable water-blocking sheet. The water-resistant pressure of this air-permeable water-shielding sheet is extremely higher than the air-resistant pressure, that is, it is air-permeable but almost impermeable, so that rainwater and the like do not penetrate through the sheet.
【０００８】[0008]
【実施例】以下、この発明の一実施例につき図面を用い
て詳細に説明する。図１はこの発明を適用した廃棄物処
分場を示すものである。この廃棄物処分場は、地盤Ｅを
掘削するか、あるいは自然の地形を利用した窪みを廃棄
物投棄ピット１として、この内部に廃棄物２ａおよび覆
土２ｂを交互に積層状態で埋め戻したもので、最終状態
では前記廃棄物２ａと覆土２ｂとの埋設物積層体２の中
央は必要に応じて多少盛り上げられ、所定の緩勾配で傾
斜した状態で周縁部に至らせている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows a waste disposal site to which the present invention is applied. In this waste disposal site, the ground E is excavated, or a pit utilizing natural terrain is used as a waste dumping pit 1 in which waste 2a and cover soil 2b are alternately backfilled in a stacked state. In the final state, the center of the buried product stack 2 of the waste 2a and the cover soil 2b is slightly raised as required, and reaches the peripheral portion in a state of being inclined at a predetermined gentle slope.
【０００９】このようにピット１内が埋設物積層体２で
満杯になった時点で最終覆土工事が行われる。まず埋設
物積層体２の表面に遮水シート６を被せる。この後必要
に応じて遮水シート６の表面に砂などからなる透水性材
料７を所定厚みに積層し、最後に透水性材料７の表面を
最終覆土８で覆い、敷き均しにより最終覆土工事を完了
する。When the inside of the pit 1 is filled with the buried object laminate 2 as described above, the final earth covering work is performed. First, the impermeable sheet 6 is put on the surface of the buried object laminate 2. Thereafter, if necessary, a water-permeable material 7 made of sand or the like is laminated on the surface of the water-blocking sheet 6 to a predetermined thickness, and finally, the surface of the water-permeable material 7 is covered with a final covering 8, and the final covering work is carried out by leveling. Complete.
【００１０】前記覆土工事と並行して、廃棄物投棄ピッ
ト１の周囲には排水溝９が掘削され、この排水溝９に面
して前記透水性材料７の層の端面７ａが露出している。
そして、ガス抜き管４が必要に応じて設置される。この
ガス抜き管４は、あらかじめピット１の最底部に溝２ｃ
を形成し、これの内部に配管された通気管３から適宜間
隔をおいて立ち上げられたもので、工事完了状態で遮水
シート６，透水性材料７および覆土８を貫通してその表
面に突出した状態となる。In parallel with the soil covering work, a drain gutter 9 is dug around the waste dumping pit 1, and an end face 7 a of the layer of the water-permeable material 7 is exposed facing the drain gutter 9. .
Then, the gas vent tube 4 is installed as needed. The gas vent pipe 4 is previously provided with a groove 2c at the bottom of the pit 1.
Formed at an appropriate interval from the ventilation pipe 3 piped therein, and penetrates the water-impervious sheet 6, the water-permeable material 7 and the covering soil 8 when the construction is completed. It will be in a protruding state.
【００１１】前記遮水シート６は、図２に示すように、
ガス透過性がありかつ遮水性のある通気性遮水シート材
料１０と、通常の塩ビシート等からなる非通気性遮水シ
ート材料１１とを、格子状のパターンにゾーニングした
状態で隣接配置し、両者の接合縁をシーム溶着などによ
り一体に接ぎ合わせて形成されたものである。このよう
に通気性および非通気性遮水シート材料１０，１１を格
子状に混在させるのは、通気性を考えれば通気性遮水シ
ート材料１０のみを全面的に敷設するのがよいが、通気
性と遮水性とを兼ね備えたシート材料にあってはその厚
さが極めて薄くなってしまうため、当該シート材料の下
に敷設された透水性材料７や埋設されている廃棄物２ａ
中から発生するガスの圧力等によって容易に破断してし
まうことが考えられるからである。それゆえ、経済性や
ガス抜き効果および接ぎ合わせ作業性を勘案して通気性
シートと非通気性シートとの面積比を決定し、図示例の
ような通気性遮水シート材料１０と非通気性遮水シート
材料１１とを格子状に配置する配置パターンに設定す
る。[0011] As shown in FIG.
A gas-permeable and water-permeable gas-permeable water-blocking sheet material 10 and a non-air-permeable water-blocking sheet material 11 made of a normal PVC sheet or the like are arranged adjacent to each other in a zoning manner in a lattice pattern. It is formed by joining the joining edges of both together by seam welding or the like. Thus the air permeability and the air-impermeable water-barrier sheet material 10, 11 Case
In consideration of air permeability, it is preferable to lay only the air-permeable water-blocking sheet material 10 over the entire surface, but in the case of a sheet material having both air-permeable and water-blocking properties, Becomes extremely thin, so that the water permeable material 7 laid under the sheet material and the embedded waste 2a
This is because it is conceivable that the gas is easily broken by the pressure of gas generated from the inside. Therefore, the area ratio between the air-permeable sheet and the air-impermeable sheet is determined in consideration of the economy, the degassing effect, and the joining workability. Set the arrangement pattern to arrange the impermeable sheet material 11 in a grid pattern.
You .
【００１２】この通気性遮水シート材料１０は、一例と
して図３に拡大して示すように、例えば厚さ１ｍｍの塩
ビシートに無数の微小孔をあけて形成した２枚の通気性
シート１０ａの間に不織布１０ｂをサンドイッチ状に積
層するとともに、通気性シート１０ａの幅方向両側に溶
着用シート１０ｃを挾み、その長手方向に沿って溶着し
て袋状に形成したもので、溶着用シート１０ｃの側縁部
に前記非通気性遮水シート材料１１の側縁部を重ね、シ
ーム溶着などによって一体に溶着している。As shown in FIG. 3 as an example, the air-permeable water-blocking sheet material 10 is made of two air-permeable sheets 10a formed by innumerable micro holes in a 1 mm thick PVC sheet, for example. A nonwoven fabric 10b is laminated in a sandwich shape therebetween, and a welding sheet 10c is sandwiched on both sides in the width direction of the breathable sheet 10a, and is welded along the longitudinal direction to form a bag shape. Are overlapped with the side edges of the non-breathable water-blocking sheet material 11 and are integrally welded by seam welding or the like.
【００１３】そして、前記通気性シート１０ａの厚さが
１ｍｍの場合に、空気に対する耐圧力は０．０３ｋｇ／
ｃｍ2 と低いため、極めて通気性が良好である反面、水
に対する耐圧力は０．４ｋｇ／ｃｍ2 と比較的高く、遮
水性に富んでいる。When the thickness of the breathable sheet 10a is 1 mm, the pressure resistance against air is 0.03 kg /
For low cm 2, and although extremely breathable is good, pressure resistance to water is relatively high as 0.4 kg / cm 2, is rich in water barrier.
【００１４】以上の構成において、覆土工事完了後にピ
ット１内に発生したガスは、埋設物積層体２の表面から
遮水シート６の裏面側に至り、通気性遮水シート材料１
０を通過することで透水性材料７の内部に侵入し、この
空隙を伝って透水性材料７の端面７ａから大気中に放出
される。なお、非通気性遮水シート材料１１の裏面に到
達したガスは、隣接する通気性遮水シート材料１０側に
移動し、同じく大気中に放出されることになる。In the above configuration, the gas generated in the pit 1 after the completion of the earth covering work reaches the back surface side of the water-blocking sheet 6 from the surface of the buried object laminated body 2 and the gas-permeable sheet material 1
0, it penetrates into the inside of the water-permeable material 7 and is released into the atmosphere from the end face 7a of the water-permeable material 7 through this gap. The gas that has reached the rear surface of the non-permeable water-permeable sheet material 11 moves to the adjacent gas-permeable water-permeable sheet material 10 and is similarly released into the atmosphere.
【００１５】なお、一時的に大量に発生したガスは通気
管３に集められ、ガス抜き管４を通じて大気中に放出さ
れる。The gas temporarily generated in a large amount is collected in the ventilation pipe 3 and discharged to the atmosphere through the gas release pipe 4.
【００１６】また、覆土工事完了後に降雨があった場合
には、覆土８に降り注いだ雨は、その内部を伝って前記
透水性材料７にしみ込む。遮水シート６は、いずれも遮
水シート材料１０，１１によって構成されているので、
透水性材料７の内部にしみ込んだ水は遮水シート６表面
の勾配に沿って流下し、透水性材料７の端面７ａから排
水溝９内に流出することになり、覆土８に雨水が滞留す
ることによる軟弱化や泥寧化を未然に防止できることに
なる。When rainfall occurs after the completion of the earth covering work, the rain falling on the earth covering 8 penetrates into the water permeable material 7 along the inside thereof. Since the water-impervious sheet 6 is composed of the water-impervious sheet materials 10 and 11,
The water that has penetrated into the water-permeable material 7 flows down along the gradient of the surface of the water-permeable sheet 6, flows out of the end face 7 a of the water-permeable material 7 into the drain groove 9, and the rainwater stays in the covering soil 8. Therefore, softening and mudning can be prevented.
【００１７】[0017]
【発明の効果】以上実施例によって詳細に説明したよう
に、この発明に係る廃棄物処分場における最終覆土工法
によれば、廃棄ピットから生じたガスは通気性遮水シー
トを通じて効率よく大気中に放出されるため、従来のよ
うに部分的にシートが浮き上がったり破断したりするこ
とがなく、安全性を確保できる。また、通気性遮水シー
トの耐水圧力は耐空気圧力に比べて極めて高いため、雨
水などがシートを通じて内部に浸透することがなく汚染
水の流出等の不具合も解消される利点がある。As described in detail in the above embodiments, according to the final earth covering method in the waste disposal site according to the present invention, the gas generated from the waste pit can be efficiently introduced into the atmosphere through the gas permeable sheet. Since the sheet is released, the sheet is not partially lifted or broken unlike the related art, and safety can be ensured. In addition, since the waterproof pressure of the air-permeable waterproof sheet is extremely higher than the air pressure, there is an advantage that rainwater or the like does not permeate through the sheet and the problem of outflow of contaminated water and the like is eliminated.
【図１】この発明に係る最終覆土工法を適用した廃棄物
処分場の断面説明図である。FIG. 1 is an explanatory sectional view of a waste disposal site to which a final earth covering method according to the present invention is applied.
【図２】同上平面図である。FIG. 2 is a plan view of the same.
【図３】通気性遮水シート材料の構造および非通気性遮
水シート材料に対する接ぎ合わせ部分を示す部分拡大断
面図である。FIG. 3 is a partially enlarged cross-sectional view showing a structure of a gas-permeable water-blocking sheet material and a joining portion to a non-air-permeable water-blocking sheet material.
１ 廃棄物投棄ピット ２ 埋設物積層体 ６ 遮水シート ７ 透水性材料 ７ａ 端面（透水性材料７の） ８ 覆土 ９ 排水溝 １０ 通気性遮水シート材料 １１ 非通気性遮水シート材料 DESCRIPTION OF SYMBOLS 1 Waste dumping pit 2 Buried object laminated body 6 Water-blocking sheet 7 Water-permeable material 7a End surface (of water-permeable material 7) 8 Covering soil 9 Drainage groove 10 Breathable water-blocking sheet material 11 Non-breathable water-blocking sheet material
Claims (1)
棄物の最上部を、非通気性遮水シートと、該非通気性遮
水シートに格子状に接ぎ合わされる通気性遮水シートと
で被覆することを特徴とする廃棄物処分場における最終
覆土工法。1. An uppermost part of a waste buried in a waste dumping pit is covered with a non-permeable air-permeable sheet and a gas-permeable water-permeable sheet joined to the non-permeable air-permeable sheet in a lattice pattern. Final covering method at a waste disposal site.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3332930A JP2830560B2 (en) | 1991-11-22 | 1991-11-22 | Final cover method at waste disposal site |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3332930A JP2830560B2 (en) | 1991-11-22 | 1991-11-22 | Final cover method at waste disposal site |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05138143A JPH05138143A (en) | 1993-06-01 |
| JP2830560B2 true JP2830560B2 (en) | 1998-12-02 |
Family
ID=18260407
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3332930A Expired - Lifetime JP2830560B2 (en) | 1991-11-22 | 1991-11-22 | Final cover method at waste disposal site |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2830560B2 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE69430275T2 (en) * | 1993-12-16 | 2002-07-18 | Kawasaki Steel Co | Method of joining pieces of metal |
| JP4684582B2 (en) * | 2004-07-08 | 2011-05-18 | 鹿島建設株式会社 | Soil cover structure at the final disposal site |
| JP4780550B2 (en) * | 2005-02-04 | 2011-09-28 | 日本国土開発株式会社 | Covering method for landfill waste and seepage water capillary barrier layer for landfill waste |
| JP4664091B2 (en) * | 2005-02-23 | 2011-04-06 | 学校法人福岡大学 | Covering structure of waste final disposal site |
| JP4716423B2 (en) * | 2006-02-02 | 2011-07-06 | 太陽工業株式会社 | Artificial closed water area provided on a concave surface made by digging the ground, and a method for suppressing deterioration of water quality in the artificial closed water area |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04228716A (en) * | 1990-09-12 | 1992-08-18 | Hitachi Cable Ltd | Air permeable impervious sheet and impervious method using same |
-
1991
- 1991-11-22 JP JP3332930A patent/JP2830560B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05138143A (en) | 1993-06-01 |
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