JP3156810B2 - Drain materials for civil engineering - Google Patents
Drain materials for civil engineeringInfo
- Publication number
- JP3156810B2 JP3156810B2 JP02808093A JP2808093A JP3156810B2 JP 3156810 B2 JP3156810 B2 JP 3156810B2 JP 02808093 A JP02808093 A JP 02808093A JP 2808093 A JP2808093 A JP 2808093A JP 3156810 B2 JP3156810 B2 JP 3156810B2
- Authority
- JP
- Japan
- Prior art keywords
- water permeability
- water
- civil engineering
- denier
- binding yarn
- 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
【０００１】[0001]
【産業上の利用分野】本発明は、軟弱地盤の改良に用い
る土木用ドレーン材に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drainage material for civil engineering used for improving soft ground.
【０００２】[0002]
【従来の技術】軟弱地盤を埋め立てたり、軟弱地盤上に
盛土などを行う土木施行の際、軟弱地盤上に直接良質土
を投入すると地盤が沈下し、安定するために時間がかか
る。その為、従来から予め軟弱地盤中に水路となる材料
を打ち込み、軟弱地盤上に投入された良質土の土圧によ
って水路を介して軟弱地盤から水を絞り出す方法が知ら
れており、この方法によれば地盤を早く安定させる事が
できる。水路となる材料の一例として、透水性のあるポ
リエチレンモノフィラメントメッシュ織物などで作った
筒状物を軟弱土中に引き込み、その後この筒状物中へ砂
または礫を詰め込んで筒状に一体化したものがある。軟
弱土中の水圧が作用すると水は砂または礫の間を通って
上方へ押し出される。水路となる材料の他の例として、
波板状プラスチック成型品の表面に透水性のある不織布
シートを貼付けしたものがある。軟弱土中の水に土圧が
作用すると水は不織布シートを通過し、波板上プラスチ
ックの凹部を通って排水される。しかし、この様なドレ
ーン材は透水路の断面積を大きくするのが困難で有り、
排水効率が悪いと共に非常に固く、土中におけるフィッ
ト性も劣り大変不安定で有ると云った施工上の問題点が
有り、改善が望まれていた。2. Description of the Related Art When civil engineering is carried out for reclaiming soft ground or embankment on soft ground, if the high quality soil is directly injected into the soft ground, the ground sinks and it takes time to stabilize. For this reason, conventionally, a method of driving a material to be a water channel into the soft ground in advance and squeezing water from the soft ground through the water channel by the earth pressure of the high quality soil put on the soft ground is known. According to this, the ground can be stabilized quickly. As an example of a material for the water channel, a cylindrical object made of a permeable polyethylene monofilament mesh fabric etc. is drawn into soft soil, and then sand or gravel is packed into this cylindrical object and integrated into a cylindrical shape There is. When water pressure in soft soil acts, water is forced upward through sand or gravel. As another example of the material used for the waterway,
There is a corrugated plastic molded product in which a water-permeable nonwoven sheet is attached to the surface. When the earth pressure acts on the water in the soft soil, the water passes through the nonwoven fabric sheet and drains through the plastic recess on the corrugated sheet. However, it is difficult for such a drain material to increase the cross-sectional area of the water passage,
There is a problem in construction that the drainage efficiency is poor and very hard, the fit in the soil is poor, and it is very unstable, and improvement has been desired.
【０００３】これらの問題点を改善する方策として、特
開平２−２２９３１５号公報では透水性を有する２枚の
繊維シートを、両シート間に所定の間隔を保つように多
数の繊維で対向状に結合したドレーン材が提案されてい
る。これは、フィルター部と荷重を支える結合部とが一
体となったドレーン材であり、適度な柔らかさを持ち施
工性及び土中フィット性に大変優れ、さらには耐圧に対
しても優れた効果を発揮することから、安定した透水性
能を確保することができる。しかし構造的な問題より、
結合糸の仕様を誤ると基布との結合部で簡単に毛だおれ
が生じ、透水性能が著しく低下すると云う欠点があっ
た。As a measure for solving these problems, Japanese Patent Laid-Open Publication No. 2-229315 discloses a method in which two fiber sheets having water permeability are opposed to each other by a large number of fibers so as to keep a predetermined interval between the two sheets. Combined drain materials have been proposed. This is a drain material in which the filter part and the joint part that supports the load are integrated, has a moderate softness, is extremely excellent in workability and fit in the soil, and has an excellent effect on pressure resistance. Since it exhibits, stable water permeability can be secured. But due to structural issues,
If the specification of the binding yarn is incorrect, there is a drawback that hair frays easily occur at the connection portion with the base fabric and the water permeability is remarkably reduced.
【０００４】[0004]
【発明が解決しようとする課題】本発明は、従来の土木
用ドレーン材の欠点を解消し、耐圧性、透水性及び施工
性に優れた土木用ドレーン材を提供することを目的とす
る。SUMMARY OF THE INVENTION An object of the present invention is to solve the drawbacks of the conventional drainage material for civil engineering and to provide a drainage material for civil engineering excellent in pressure resistance, water permeability and workability.
【０００５】[0005]
【課題を解決するための手段】本発明は、前記課題を解
決するために次の手段をとるものである。すなわち、本
発明は、透水性を有する２枚の繊維シートが所定の間隔
Ｌ（ｍｍ）をおいて対向して結合糸で結合され、結合糸
密集度Ｐ（本／ｉｎ2 ）、該結合糸の太さＤ（デニー
ル）、該所定の間隔Ｌ（ｍｍ）の間に下記の関係がある
ことを特徴とする土木用ドレーン材である。 ８０≦Ｄ×Ｐ／Ｌ2 ≦１２０００ 但し、１００デニール≦Ｄ≦５０００デニール ５０本／ｉｎ2 ≦Ｐ≦１２００本／ｉｎ2 ３ｍｍ≦Ｌ≦５０ｍｍ である。The present invention employs the following means to solve the above-mentioned problems. That is, according to the present invention, two fiber sheets having water permeability are joined to each other with a binding yarn facing each other at a predetermined distance L (mm), and the binding yarn density P (book / in 2 ) Is a drain material for civil engineering, characterized in that the following relationship exists between the thickness D (denier) and the predetermined interval L (mm). 80 ≦ D × P / L 2 ≦ 12000 where 100 denier ≦ D ≦ 5000 denier 50 / in 2 ≦ P ≦ 1200 / in 2 3 mm ≦ L ≦ 50 mm
【０００６】以下に本発明を詳細に図をまじえて説明す
る。本発明において、透水性を有する繊維シートは、あ
る粒径以上の土砂の流入を防止するフィルターの役目を
果たすもので、透水係数が１０-1ｃｍ／Ｓ以上のものが
軟弱地盤からの排水性を良くする上で好ましい。Hereinafter, the present invention will be described in detail with reference to the drawings. In the present invention, the fiber sheet having water permeability functions as a filter for preventing inflow of earth and sand having a certain particle size or more, and a material having a water permeability coefficient of 10 -1 cm / S or more has a drainage property from soft ground. It is preferable in improving the quality.
【０００７】前記繊維シートを構成する糸は、施工性、
土中フィット性に優れているものであれば良く、例えば
合成マルチフィラメント、合成モノフィラメント、紡績
糸などが挙げられる。前記糸の太さは２０〜５０００デ
ニールが好ましく、さらに、フィルター効果、取扱い性
の観点から５０〜５００デニールがより好ましい。な
お、繊維シートとしては、たて編などの編地、不織布、
織物などがあげられる。The yarn constituting the fiber sheet has workability,
What is necessary is just what is excellent in the underground fitting property, for example, synthetic multifilament, synthetic monofilament, spun yarn and the like. The thickness of the yarn is preferably 20 to 5000 denier, and more preferably 50 to 500 denier from the viewpoint of filter effect and handleability. In addition, as a fiber sheet, knitted fabric such as warp knit, non-woven fabric,
Fabrics and the like can be mentioned.
【０００８】次に、結合糸３は、図１に示すように繊維
シート１、２を所定の間隔Ｌをおいて結合するものであ
るが、土圧に耐えるようにするためモノフィラメントが
好ましく、曲げ剛性の大きいものが好ましい。結合糸３
の太さは、１００〜５０００デニールが好ましく、耐圧
性、生産性、透明性を考慮すれば３００〜２０００デニ
ールがより好ましい。Next, as shown in FIG. 1, the binding yarn 3 binds the fiber sheets 1 and 2 at a predetermined interval L, and is preferably a monofilament to withstand the earth pressure. Those having high rigidity are preferred. Binding yarn 3
Is preferably 100 to 5000 denier, and more preferably 300 to 2000 denier in consideration of pressure resistance, productivity and transparency.
【０００９】図１で、Ｌ（ｍｍ）は、３〜５０ｍｍが好
ましい。Ｌが短いほど耐圧性能に優れるが、おのずと透
水量に制限が出てくるため、３ｍｍ以上でなければなら
ない。他方、Ｌが長いほど透水性能には優れるが、逆に
繊維シート１又は２との結合部でも毛倒れが生じ、透水
性能が著しく低下する恐れがあるため５０ｍｍ以下でな
ければならない。より好ましくは３〜２０ｍｍである。In FIG. 1, L (mm) is preferably 3 to 50 mm. The shorter L is, the more excellent the pressure resistance performance is, but the amount of water permeation is naturally restricted, so that it must be 3 mm or more. On the other hand, the longer the length L, the better the water permeability, but conversely, hairs may fall at the joint with the fiber sheet 1 or 2, and the water permeability may be significantly reduced. More preferably, it is 3 to 20 mm.
【００１０】さらに、結合糸密集度Ｐ（本／ｉｎ2 ）
は、５０〜１２００本／ｉｎ2 の範囲が好ましい。５０
本／ｉｎ2 未満である場合、毛倒れによる透水性能の低
下が発生しやすく、他方１２００本／ｉｎ2 をこえる場
合には、土圧による耐圧性能は非常に優れているもの
の、透水性能に劣り、さらには生産性が著しく低下する
という問題が生ずる。好ましくは、１００〜６００本／
ｉｎ2 が適当である。Furthermore, the binding yarn density P (book / in 2 )
Is preferably in the range of 50 to 1200 lines / in 2 . 50
When the number is less than the number of fibers / in 2 , the water permeability is liable to decrease due to the hair falling down. On the other hand, when the number exceeds 1200 pieces / in 2 , the pressure resistance by the earth pressure is very good, but the water permeability is poor. In addition, there is a problem that productivity is significantly reduced. Preferably, 100-600 pieces /
in 2 is appropriate.
【００１１】また、結合糸３の太さＤ（デニール）、所
定の間隔Ｌ（ｍｍ）、結合糸密集度Ｐ（本／ｉｎ2 ）と
の間の関係式Ｄ×Ｐ／Ｌ2 は、８０〜１２０００の範囲
にあることが好ましい。８０未満である場合に、毛倒れ
が発生しやすく、１０トン／ｍ2 未満の荷重下でも容易
に毛倒れが生じ、透水性能が著しく低下する。逆に、１
２０００をこえる場合には、土圧による耐圧性能は非常
に優れるものの通水路が塞がれた格好となっているた
め、厚みの割には透水性能が劣ったものとなってしま
う。耐圧性能（透水性能）を保持し、生産性を考慮に入
れたより好ましい範囲は３００〜６０００が適当であ
る。The relational expression D × P / L 2 between the thickness D (denier) of the binding yarn 3, a predetermined distance L (mm), and the density of binding yarn P (book / in 2 ) is 80 It is preferably in the range of ~ 12,000. When it is less than 80, hair falling easily occurs even under a load of less than 10 tons / m 2 , and the water permeability is remarkably reduced. Conversely, 1
If it exceeds 2,000, the pressure resistance performance due to the earth pressure is very good, but the water passage is closed, so that the water permeability is inferior to the thickness. A more preferable range in which the pressure resistance performance (water permeability performance) is maintained and the productivity is taken into consideration is suitably from 300 to 6000.
【００１２】繊維シート１と繊維シート２とを結合糸３
で結合するには、２重織ベルベット又はダブルラッセル
等の結接組織による方法が生産上好ましいが、タフティ
ング又はその他の方法を用いても差支えない。A fiber sheet 1 and a fiber sheet 2 are combined with a binding yarn 3
In order to combine with each other, a method using a binding structure such as a double-woven velvet or a double Russell is preferable in terms of production, but tufting or another method may be used.
【００１３】[0013]
実施例１〜２、比較例１ ダブルラッセル機を用い、表１に示すような条件でラッ
セル編地２枚を結束糸で結合し、透水係数を測定し、表
１に示した。なお、透水係数の測定は下記の方法によっ
た。 透水係数Ｋ（ｃｍ／Ｓ）＝ＱＤ／ＡｔＨ ここで、Ｑは、ｔ時間（Ｓ）に断面積Ａ（ｃｍ2 ）なる
試料の中を流れる水量（ｃｍ3 ）、Ｈは水頭差（ｃ
ｍ）、Ｄは試料厚さ（ｃｍ）である。Examples 1 and 2, Comparative Example 1 Using a double Russell machine, two Russell knitted fabrics were joined with binding yarns under the conditions shown in Table 1, and the water permeability was measured. In addition, the measurement of the water permeability was based on the following method. Water permeability K (cm / S) = QD / AtH Here, Q is the amount of water (cm 3 ) flowing in a sample having a cross-sectional area A (cm 2 ) at time t (S), and H is the head difference (c).
m) and D are sample thicknesses (cm).
【００１４】[0014]
【表１】 [Table 1]
【００１５】実施例１のものは、結束糸が荷重をうまく
支える構造となっているため、毛倒れが悪く、透水係数
も優れていた。実施例２のものは、結束糸が強く荷重を
良く支えるものであったので毛倒れもなく、特に透水性
能に優れていた。比較例１のものは、結束糸が完全に倒
れた状態となっているため通水路が塞がれ、結束糸の長
さ２０ｍｍの無荷重下の透水性能とは比較にならない程
の水量しか排水されなかった。なお、透水係数は、いず
れも１０トン／ｍ2 の荷重下における横方向のものであ
った。In the case of the first embodiment, since the binding yarn has a structure that supports the load well, the hair falls down and the water permeability is excellent. In Example 2, the binding yarn was strong and well supported the load, so that it did not fall down and was particularly excellent in water permeability. In the case of Comparative Example 1, the water passage was closed because the binding yarn was completely collapsed, and only the amount of water that was incomparable with the no-load water permeability of the binding yarn having a length of 20 mm was drained. Was not done. In addition, the water permeability was in the horizontal direction under a load of 10 tons / m 2 .
【００１６】[0016]
【発明の効果】本発明の土木用ドレーン材は、耐圧性、
透水性、施工性にともに優れたものであった。The drain material for civil engineering according to the present invention has a pressure resistance,
Both water permeability and workability were excellent.
【図１】本発明の土木用ドレーン材の側面図である。FIG. 1 is a side view of a drain material for civil engineering of the present invention.
１ 繊維シート ２ 繊維シート ３ 結束糸 Reference Signs List 1 fiber sheet 2 fiber sheet 3 binding yarn
フロントページの続き (56)参考文献 特開 平２−229315（ＪＰ，Ａ) 特開 昭63−112762（ＪＰ，Ａ) 特開 平３−199040（ＪＰ，Ａ) 実開 昭56−171825（ＪＰ，Ｕ) 実開 昭63−165330（ＪＰ，Ｕ) 実開 平６−20524（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.7，ＤＢ名) E02D 3/10 Continuation of the front page (56) References JP-A-2-229315 (JP, A) JP-A-63-112762 (JP, A) JP-A-3-199040 (JP, A) Jpn. , U) Shokai 63-165330 (JP, U) Shokai 6-20524 (JP, U) (58) Fields investigated (Int. Cl. 7 , DB name) E02D 3/10
Claims (1)
の間隔Ｌ（ｍｍ）をおいて対向して結合糸で結合され、
結合糸密集度（本／ｉｎ2 ）、該結合糸の太さＤ（デニ
ール）、該所定の間隔Ｌ（ｍｍ）の間に下記の関係があ
ることを特徴とする土木用ドレーン材。 ８０≦Ｄ×Ｐ／Ｌ2 ≦１２０００ 但し、１００デニール≦Ｄ≦５０００デニール ５０本／ｉｎ2 ≦Ｐ≦１２００本／ｉｎ2 ３ｍｍ≦Ｌ≦５０ｍｍ1. Two fiber sheets having water permeability are bonded to each other with a bonding yarn at a predetermined interval L (mm).
A drain material for civil engineering, wherein the following relationship exists between the binding yarn density (books / in 2 ), the thickness D (denier) of the binding yarn, and the predetermined interval L (mm). 80 ≦ D × P / L 2 ≦ 12000 where 100 denier ≦ D ≦ 5000 denier 50 / in 2 ≦ P ≦ 1200 / in 2 3 mm ≦ L ≦ 50 mm
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP02808093A JP3156810B2 (en) | 1993-02-17 | 1993-02-17 | Drain materials for civil engineering |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP02808093A JP3156810B2 (en) | 1993-02-17 | 1993-02-17 | Drain materials for civil engineering |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06240654A JPH06240654A (en) | 1994-08-30 |
| JP3156810B2 true JP3156810B2 (en) | 2001-04-16 |
Family
ID=12238804
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP02808093A Expired - Lifetime JP3156810B2 (en) | 1993-02-17 | 1993-02-17 | Drain materials for civil engineering |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3156810B2 (en) |
-
1993
- 1993-02-17 JP JP02808093A patent/JP3156810B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06240654A (en) | 1994-08-30 |
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