JPH0647815B2 - Composite sheet for landfill cover and landfill cover method - Google Patents
Composite sheet for landfill cover and landfill cover methodInfo
- Publication number
- JPH0647815B2 JPH0647815B2 JP62168091A JP16809187A JPH0647815B2 JP H0647815 B2 JPH0647815 B2 JP H0647815B2 JP 62168091 A JP62168091 A JP 62168091A JP 16809187 A JP16809187 A JP 16809187A JP H0647815 B2 JPH0647815 B2 JP H0647815B2
- Authority
- JP
- Japan
- Prior art keywords
- sheet
- composite sheet
- net
- landfill
- soft ground
- 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
Landscapes
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 この発明は軟弱地盤を埋立覆土するに用いる複合シート
および埋立覆土する工法に関する。TECHNICAL FIELD The present invention relates to a composite sheet used for landfill covering soft ground and a method for landfill covering.
一般に軟弱な地盤を埋立覆土する場合、予め埋立るべき
軟弱地盤に帆布等のシート状物を敷設しその上に覆土し
ていた。しかし、対象とする地盤が超軟弱な場合等にお
いてはシート状物のみでは強度あるいは剛性が不充分で
あり、施工中にシート状物が破損して軟泥が逸出した
り、覆土作業に耐える平面の形成が困難である等の問題
があった。これらの問題点に対し、例えば軟弱地盤上に
敷設した帆布シートの上にロープをネット状に組合せて
被せ、帆布シートに働く引張力をネット状に組んだロー
プで支持させる提案がある。しかし、この提案も帆布シ
ートとネット状のロープとが単に重なっているに過ぎな
いので、帆布シートに作用する力を必ずしもロープで支
持することはできない。また、帆布シートの剛性を高め
る上でも効率のよい方法ではなく、施工の上からも手間
がかかる方法であった。Generally, in the case of covering the soft ground with landfill, a sheet-like material such as canvas is laid on the soft ground to be landfilled in advance and the soil is covered therewith. However, when the target ground is ultra-soft, etc., the strength or rigidity of the sheet alone is insufficient, and the sheet may be damaged during construction and the soft mud may escape, or a flat surface that is resistant to soil covering work. There were problems such as difficulty in forming. In order to solve these problems, for example, there is a proposal in which a rope is combined and covered with a net on a canvas sheet laid on soft ground, and the tensile force acting on the canvas sheet is supported by the rope that is assembled in the net. However, in this proposal as well, the canvas sheet and the net-shaped rope merely overlap with each other, so that the force acting on the canvas sheet cannot always be supported by the rope. In addition, it is not an efficient method for increasing the rigidity of the canvas sheet, and it is a method that requires time and effort from the viewpoint of construction.
この発明は上記事情に鑑みなされたものである。その目
的は、軟弱地盤の埋立覆土に際し泥土の逸出等が起こら
ず作業性の向上を図り得る複合シートおよびこの複合シ
ートを用いた埋立覆土工法を提案にするにある。The present invention has been made in view of the above circumstances. It is an object of the present invention to propose a composite sheet that can improve workability by preventing mud soil from escaping when landfill covering soft ground, and a landfill covering method using this composite sheet.
この埋立覆土用の複合シートは、組織が密でフィルター
機能をもち、引張強度が100〜2000kg／３cm幅の織物か
らなるシート状物と網目寸法が１〜５０mmで組織が疎で
あり、引張強度が100〜2000kg／３cm幅のネット状物と
を積層一体化してなることを特徴とする。他の一つの発
明の埋立覆土工法は、軟弱地盤を埋立覆土するに先だち
軟弱地盤表面に前記複合シートを、覆土により地盤が低
下する時はシート状物を上面となし、押上げられる時は
シート状物を下面となし敷設することを特徴とする。This composite sheet for landfill cover has a dense structure and has a filter function, a sheet-like material made of a woven fabric having a tensile strength of 100 to 2000 kg / 3 cm and a mesh size of 1 to 50 mm, and the structure is sparse, and the tensile strength is Is characterized by being integrally laminated with a net-like material having a width of 100 to 2000 kg / 3 cm. Another aspect of the present invention is a landfill cover method, in which the composite sheet is provided on the surface of the soft ground before the soft ground is covered by the soil, and when the ground is lowered due to the cover soil, the sheet-like material is used as the upper surface, and when pushed up, the sheet is used. It is characterized in that the material is laid without a bottom surface.
第１図はこの発明になる埋立覆土用の複合シート１であ
り、ポリエステル（マルチフィラメント）糸条を使用し
た組織が密な帆布からなるシート状物２に、ポリエステ
ル糸条を使用してからみ織りしてなった組織が疎で四角
網目（網目寸法５mm角）のネット状物３を積層し、縫糸
４で縫合し一体化し構成されている。この複合シートに
おいて、シート状物２は透水性はあるが土砂の透過を抑
制するフィルター機能をもち、ネット状物３は糸条表面
に樹脂被膜を塗着し、シート状物２に比べ高い剛性が付
与してある。FIG. 1 shows a composite sheet 1 for landfill cover according to the present invention, in which a polyester (multifilament) yarn is used as a sheet-like material 2 made of a dense fabric and a polyester yarn is used for the knitting The mesh-like structure is sparse and the net-like material 3 having a square mesh (mesh size 5 mm square) is laminated and sewn with a suture thread 4 to be integrated. In this composite sheet, the sheet-like material 2 is water-permeable, but has a filter function of suppressing the permeation of earth and sand, and the net-like material 3 has a resin coating applied on the surface of the yarn, and has a higher rigidity than the sheet-like material 2. Has been given.
この複合シート１は、第２図のごとく軟弱地盤５を埋立
覆土するに先だち、軟弱地盤５上に、例えばネット状物
３の面を上にして敷設し、その上に覆土６を施して埋立
覆土が施工される。この複合シート１は高強度でフィル
ター機能をもつシート状物と高強度で剛性が高いネット
状物とが一体となり、高い剛性、引張強度およびフィル
ター機能を発揮し、軟弱地盤上における作業性を良好に
保つと共に、揚圧力による泥土の逸出を防止する。As shown in FIG. 2, this composite sheet 1 is laid on the soft ground 5 with the surface of the net-like object 3 facing up before covering the soft ground 5 with the soil, and the soil 6 is applied to the land to cover the land. Cover soil is constructed. This composite sheet 1 is a combination of a sheet material having a high strength and a filter function and a net material having a high strength and a high rigidity, and exhibits a high rigidity, a tensile strength and a filter function, and has a good workability on soft ground. And prevent the mud from escaping due to lifting pressure.
揚圧力が高い軟弱地盤では、この複合シート１をネット
状物３を下にして敷設した場合は、第３図のごとく、シ
ート状物２が押上げられて膨れるが、ネット状物３と縫
合一体化してあるので破損しがたく、作業性を損なうこ
とはない。また、ネット状物３を上にして敷設し、その
上に覆土した場合第４図のように、覆土荷重によりシー
ト状物２が下に押下げられるが、この場合もネット状物
３と一体となり、大きな変形や破損が起こりがたい。In the soft ground where the lifting pressure is high, when the composite sheet 1 is laid with the net-like object 3 facing downward, the sheet-like object 2 is pushed up and swells as shown in FIG. Since it is integrated, it is hard to break and does not impair workability. Further, when the net-like material 3 is laid up and covered with soil, the sheet-like material 2 is pushed down by the soil-covering load as shown in FIG. Therefore, large deformation and damage are unlikely to occur.
しかし、覆土によって地盤が低下したり、押上げられた
りすることが事前に明らかな場合に、この複合シートの
性能をより有効に発揮するには、作用する応力に対しシ
ート状物面を内側、ネット状物面を外側にして敷設しな
ければならない。すなわち、覆土により地盤が低下する
場合はシート状物面を上面にし、押上げられる場合は下
面にして敷設する。この様に敷設することにより、一体
となったシート状物のフィルター機能、強度とネット状
物の剛性、強度が損なわれることなく、確実に発揮でき
る。However, when it is clear in advance that the ground will be lowered or pushed up due to the soil cover, in order to more effectively demonstrate the performance of this composite sheet, the sheet-like material surface should be placed inside the It must be laid with the net side facing outwards. That is, when the ground is lowered due to the soil cover, the sheet-like object surface is laid on the upper surface, and when pushed up, the lower surface is laid on the lower surface. By laying in this way, the filter function and strength of the integrated sheet-like material and the rigidity and strength of the net-like material can be reliably exhibited without being impaired.
この発明で用いる複合シートはそれぞれ別の機能をもつ
シート状物とネット状物とを積層一体化したものであ
る。シート状物は水を透過し、土砂の透過を抑制し軟弱
地盤の排水安定化に機能する。ネット状物はシート状物
のフィルター機能を損なうことなく、シート状物のみで
は不足する引張強度、剛性を著しく高める働きをなし、
安全確実な埋立覆土の施工、作業能率のよい環境の形成
に機能する。シート状物を単独で用いてフィルター機能
のほか、強度剛性を同時に満足することはむずかしい。
また、シート状物とネット状物とを単に重ねて敷設使用
しても、作用する引張力に対しそれぞれ別に対応するの
で、一体となった複合シートのごとき強度、剛性の向上
を期待することはできない。The composite sheet used in the present invention is formed by laminating and integrating a sheet-like material and a net-like material having different functions. The sheet-like material permeates water, suppresses permeation of sediment, and functions to stabilize drainage of soft ground. The net-like material does not impair the filter function of the sheet-like material, and functions to remarkably increase the tensile strength and rigidity, which are insufficient with the sheet-like material alone.
It functions to construct a safe and reliable landfill soil and create an environment with good work efficiency. It is difficult to satisfy the strength and rigidity at the same time in addition to the filter function by using the sheet material alone.
Further, even if the sheet-like material and the net-like material are simply laid and used, the tensile strengths acting on the sheet-like material and the net-like material are separately responded to each other. Therefore, improvement of strength and rigidity such as an integrated composite sheet is not expected. Can not.
この複合シートは第１図のごとき一層のシート状物とネ
ット状物との積層物のほか、揚圧力、覆土荷重、作業条
件等の使用条件、あるいは複合シートに対する要求性能
に応じて第５図のごとくシート状物２の両面にネット状
物３，３を積層したり、第６図のごとくネット状物３の
両面にシート状物２，２を積層する等様々な組合せの態
様をとることができる。また、積層一体化の手段として
第５図のごとく縫糸４により不連続点状に縫合しても、
あるいは第６図のごとく縫糸４により連続線状に縫合す
ることもできる。また、縫糸４による縫合に代わり、ピ
ン、ベルト、ホッチギス等の係止金具を用いたり、加熱
溶着、接着剤接着等の手段で一体化することもできる。
積層一体化は加工工場で行っても、あるいは施工現場で
敷設に先だち行ってもよい。This composite sheet is a laminate of a sheet-like material and a net-like material as shown in FIG. 1, as well as operating conditions such as lifting pressure, soil load and working conditions, or performance required for the composite sheet. As shown in FIG. 6, the net-like materials 3 and 3 may be laminated on both sides of the sheet-like material 2 or the sheet-like materials 2 and 2 may be laminated on both sides of the net-like material 3 as shown in FIG. You can Further, as a means for laminating and integrating the layers, as shown in FIG.
Alternatively, as shown in FIG. 6, a continuous thread can be sewn with a suture thread 4. Further, instead of suturing with the suture thread 4, a locking metal fitting such as a pin, a belt or a stapler may be used, or they may be integrated by means such as heat welding or adhesive bonding.
Lamination integration can be done at the processing plant or at the construction site prior to laying.
シート状物はフィルター機能をもつとともに、ネット状
物と一体となって軟弱地盤の揚圧力、覆土の荷重、ある
いは工事に伴い発生する応力等に耐える強度を必要とす
る。通常ポリエステルあるいはナイロン等の合成繊維マ
ルチフィラメント糸条を用いた密な組織の平織物あるい
は綾織物であり、その引張強度は経、緯方向共100〜200
0kg／３cm幅の範囲である。The sheet-like material must have a filter function and must be strong enough to withstand the lifting force of soft ground, the load of soil cover, and the stress generated by construction work together with the net-like material. Usually, it is a plain weave or a twill weave with a dense structure using synthetic fiber multifilament yarns such as polyester or nylon. Its tensile strength is 100 to 200 in both warp and weft directions.
The range is 0 kg / 3 cm width.
ネット状物はポリエステル等の合成繊維マルチフィラメ
ント糸条、ポリエチレン等の合成繊維モノフィラメント
糸条あるいは扁平モノフィラメント糸条等を用いたから
み織物、平織物等であり、１mm〜５０mm角程度の網目を
もつ疎の組織である。このネット状物はシート状物と一
体となり高強度の複合シートを形成するためシート状物
と同等の引張強度とする。また、必要に応じネット状物
を構成する糸条を合成樹脂コーテングしたり、太繊度の
モノフィラメント糸あるいは扁平モノフィラメント糸を
用いたり、高張力下で熱セットしたりして、シート状物
に比べ高い剛性となし、複合シートに高い剛性を付与す
べくなしてある。The net-like material is a woven fabric or a flat woven fabric using a synthetic fiber multifilament yarn such as polyester, a synthetic fiber monofilament yarn such as polyethylene, or a flat monofilament yarn, and has a mesh of about 1 mm to 50 mm square. Is an organization. Since this net-like material is integrated with the sheet-like material to form a high-strength composite sheet, it has the same tensile strength as the sheet-like material. In addition, if necessary, the yarns that make up the net-like material are coated with synthetic resin, monofilament threads with large fineness or flat monofilament threads are used, and heat setting is performed under high tension. It is designed to give rigidity to the composite sheet.
シート状物：ポリエステルマルチフィラメント糸使用平
織物 目付 550ｇ／m2 引張強度、経、緯共 520kg／３cm幅 透水係数 4.1×10-3cm／sec ネット状物：ポリエステルマルチフィラメント糸使用か
らみ織物 目付 480ｇ／m2 引張強度、経、緯共 350kg／５cm幅 網目寸法 ６mm角 （ビニル系樹脂エマルジョン塗着した後緊張 熱セットと、剛性を高めたもの） 上記シート状物とネット状物とを加工工場で縫合一体化
して複合シート（幅２ｍ）をつくり、さらに、幅方向に
３列並列に縫合させて、縫製複合シート（幅約６ｍ）と
した。Sheet: Polyester multifilament yarn plain weave 550 g / m 2 Tensile strength, warp, weft 520 kg / 3 cm width Water permeability 4.1 × 10 -3 cm / sec Net: Polyester multifilament yarn weave woven fabric 480 g / M 2 Tensile strength, warp, weft 350 kg / 5 cm width Mesh size 6 mm square (tensile heat set after vinyl resin emulsion coating and increased rigidity) Processing factory for the above sheet and net A sewn composite sheet (width of about 6 m) was obtained by sewn and integrated into a composite sheet (width: 2 m) and further sewn in parallel in three rows in the width direction.
この縫製複合シート１′を護岸７上でシート状物２面を
下にして、複数、縦横方向に継ぎ合せ一端縁に固定した
鋼棒８を牽引して順次護岸に続く埋立てるべき軟弱地盤
５上に引出し所要の面積に敷設した。この際、護岸７上
に砂９を撒いて複合シート１′の滑りを促進し、同時に
軟弱地盤５上に水１０を浅く張り摩擦の低減を図った。
軟弱地盤５に引出した複合シート１′の後端部はアンカ
ー１１を打込み係止するとともに護岸７上に押え盛土１
２をなし固定した。同時に図示しないが、複合シート
１′の先端部は軟弱地盤５上に設けた固定地盤上におい
てアンカーにより係止し、覆土材による覆土を行ない固
定した。This sewn composite sheet 1'on the revetment 7 with the sheet-like material 2 side facing down, a plurality of longitudinally and laterally spliced steel rods 8 fixed to one end edge are pulled to sequentially soft land 5 to be reclaimed. It was laid out and laid out in the required area. At this time, sand 9 was sprinkled on the seawall 7 to promote the slippage of the composite sheet 1 ', and at the same time, the water 10 was shallowly stretched on the soft ground 5 to reduce the friction.
The rear end portion of the composite sheet 1'pulled out to the soft ground 5 is anchored by anchoring the anchor 11 and is pressed onto the seawall 7
2 was fixed. At the same time, although not shown, the front end of the composite sheet 1'is fixed by anchoring it on a fixed ground provided on the soft ground 5 by covering it with soil and covering it with soil.
この様に複合シートを敷設した後、常法に従い盛土を行
ない埋立を行なった。複合シートは軟弱地盤の揚圧力、
盛土の荷重、あるいは工事に伴なう応力に耐え、かつ複
合シート敷設面の剛性が高く工事の作業能率の向上が達
成できた。After laying the composite sheet in this manner, embankment was performed and landfilling was performed according to a conventional method. The composite sheet is the lifting force of soft ground,
Withstanding the load of embankment and the stress associated with construction, the rigidity of the composite sheet laying surface was high, and the work efficiency of construction could be improved.
この発明は以上の通りであり、この複合シートおよび工
法は軟弱地盤の埋立覆土の工事を安全・確実かつ能率よ
く実施することを可能とする。The present invention is as described above, and the composite sheet and the construction method enable safe, reliable, and efficient construction of landfill soil for soft ground.
第１図はこの発明になる複合シートの一部断面で示す斜
視図、第２図は軟弱地盤をこの工法により埋立覆土した
状態の縦断面図、第３，４図はそれぞれ軟弱地盤に敷設
した複合シートに揚圧力および覆土荷重がかかった状態
の縦断面図、第５，６図はそれぞれ複合シートの異なる
態様例を示す縦断面図、第７，８図はそれぞれ護岸に続
く軟弱地盤に複合シートを敷設する状態の斜視図および
縦断面図である。 １……複合シート、２……シート状物、３……ネット状
物、４……縫糸、５……軟弱地盤、６……覆土、７……
護岸、８……鋼棒、９……砂、１０……水、１１……ア
ンカー、１２……押え盛土。FIG. 1 is a perspective view showing a partial cross section of a composite sheet according to the present invention, FIG. 2 is a vertical sectional view showing a state in which soft ground is covered with land by this method, and FIGS. 3 and 4 are each laid on soft ground. Longitudinal section of the composite sheet under lifting pressure and soil load, Figures 5 and 6 are vertical sections showing different embodiments of the composite sheet, and Figures 7 and 8 are composite of soft ground following revetment. It is a perspective view and a longitudinal section of a state where a seat is laid. 1 ... Composite sheet, 2 ... Sheet-like material, 3 ... Net-like material, 4 ... Sewing thread, 5 ... Soft ground, 6 ... Soil cover, 7 ...
Seawall, 8 ... Steel rod, 9 ... Sand, 10 ... Water, 11 ... Anchor, 12 ... Presser embankment.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 五十嵐 格 東京都港区元赤坂１丁目２番７号 鹿島建 設株式会社内 (56)参考文献 特公 昭53−37660（ＪＰ，Ｂ２) ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Igarashi Iwamoto, Akasaka 1-2-7, Minato-ku, Tokyo Kashima Construction Co., Ltd. (56) References Japanese Patent Publication Sho 53-37660 (JP, B2)
Claims (2)
度が100〜2000kg／３cm幅の織物からなるシート状物と
網目寸法が１〜５０mmで組織が疎であり、引張強度が10
0〜2000kg／３cm幅のネット状物とを積層一体化してな
ることを特徴とする埋立覆土用複合シート。1. A sheet-like material having a dense structure having a filter function, a tensile strength of 100 to 2000 kg / 3 cm width and a mesh size of 1 to 50 mm, and having a loose structure and a tensile strength of 10
A composite sheet for landfill cover, which is formed by laminating and integrating a net-like material having a width of 0 to 2000 kg / 3 cm.
表面に、組織が密でフィルター機能をもち、引張強度が
100〜2000kg／３cm幅の織物からなるシート状物と網目
寸法が１〜５０mmで組織が疎であり、引張強度が100〜2
000kg／３cm幅のネット状物とを積層一体化してなる複
合シートを、覆土により地盤が低下する時はシート状物
を上面となし、押上げられる時はシート状物を下面とな
し敷設することを特徴とする埋立覆土工法。2. Before the soft ground is covered by landfill, the surface of the soft ground is dense and has a filter function and a tensile strength
Sheet-like material consisting of 100-2000kg / 3cm width woven fabric with mesh size of 1-50mm, sparse structure and tensile strength of 100-2
Laying a composite sheet that is made by laminating and integrating a net-like material with a width of 000 kg / 3 cm with the sheet-like material as the upper surface when the ground is degraded by soil cover and the sheet-like material as the lower surface when being pushed up. Landfill cover construction method characterized by.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62168091A JPH0647815B2 (en) | 1987-07-06 | 1987-07-06 | Composite sheet for landfill cover and landfill cover method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62168091A JPH0647815B2 (en) | 1987-07-06 | 1987-07-06 | Composite sheet for landfill cover and landfill cover method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6414415A JPS6414415A (en) | 1989-01-18 |
| JPH0647815B2 true JPH0647815B2 (en) | 1994-06-22 |
Family
ID=15861678
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62168091A Expired - Lifetime JPH0647815B2 (en) | 1987-07-06 | 1987-07-06 | Composite sheet for landfill cover and landfill cover method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0647815B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5748497B2 (en) * | 2011-02-14 | 2015-07-15 | 五洋建設株式会社 | Rope net for covering soil in soft ground, rod assembly rope net for creating rope net, and laying method of rope net |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IL52926A (en) * | 1976-09-17 | 1980-06-30 | Ciba Geigy Ag | 2-(n-methylcarbamoyloxyphenylimino)-thiazolidine derivatives,their production and their use as pesticides |
-
1987
- 1987-07-06 JP JP62168091A patent/JPH0647815B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6414415A (en) | 1989-01-18 |
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