JPH0885936A - Drain material - Google Patents
Drain materialInfo
- Publication number
- JPH0885936A JPH0885936A JP24672994A JP24672994A JPH0885936A JP H0885936 A JPH0885936 A JP H0885936A JP 24672994 A JP24672994 A JP 24672994A JP 24672994 A JP24672994 A JP 24672994A JP H0885936 A JPH0885936 A JP H0885936A
- Authority
- JP
- Japan
- Prior art keywords
- drain material
- drain
- ground
- synthetic resin
- water
- 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.)
- Pending
Links
Landscapes
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、埋立工事等で軟弱地盤
中の過剰水分を排除圧密し、埋立工事等における軟弱地
盤を改良するためのドレーン工法に使用されるドレーン
材に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drain material used in a drain construction method for eliminating and consolidating excess water in soft ground during landfill work and improving the soft ground in landfill work.
【０００２】[0002]
【従来の技術】上記ドレーン工法は、帯状のドレーン材
を専用の打設機で軟弱地盤中に打設し、粘性土内に発生
した過剰間隙水圧による間隙水をドレーン材に導き、ド
レーン材を通して地表面に排出させて粘性土の沈下を促
進し、地盤強度を増加せしめる工法である。上記工法に
用いられるドレーン材として、出願人はさきに、実願昭
６２−５６７８７（実開昭６３−１６５３２９）を考案
した。このものは、合成樹脂フィラメントを３次元的に
交絡した剛強な立体網状構造体を不織布からなる被覆材
で面接触して被覆したものであり、長手方向の屈曲性を
有し、柔軟性を高めると同時に側面の剛性が高く、高い
通水性とあらゆる土壌・地盤下の圧密条件にも対応で
き、好適に使用されている。しかしながら、上記ドレー
ン材中に導かれた水は、他の構造のドレーン材同様、ド
レーン材構成要素の芯材または被覆材の毛細管中を大気
圧に抗して毛管現象により上昇させて地上に排出される
のであり、ドレーン材先端は通常地中１０〜２０ｍの深
さに達するので、ドレーン材中の水が排出され、地盤が
沈下安定するまでに長期間を要する。2. Description of the Related Art In the above-mentioned drain method, a belt-shaped drain material is placed in the soft ground by a dedicated placing machine, and the pore water due to the excessive pore water pressure generated in the cohesive soil is guided to the drain material and passed through the drain material. It is a method of discharging the soil to the ground surface to accelerate the settlement of cohesive soil and increase the ground strength. As a drain material used in the above-mentioned construction method, the applicant previously devised a Japanese Patent Application No. Sho 62-56787 (No. Sho 63-165329). This is a rigid three-dimensional network structure in which synthetic resin filaments are three-dimensionally entangled, and is covered with a covering material made of a non-woven fabric so as to have longitudinal flexibility and enhance flexibility. At the same time, the rigidity of the side surface is high, and it is suitable for use because it has high water permeability and can cope with all soil and subconsolidation conditions. However, like the drain materials of other structures, the water introduced into the drain material rises by capillary action against the atmospheric pressure in the capillaries of the core material of the drain material component or the coating material and is discharged to the ground. Since the tip of the drain material normally reaches a depth of 10 to 20 m in the ground, it takes a long time for the water in the drain material to be discharged and the ground to sink and stabilize.
【０００３】[0003]
【発明が解決しようとする課題】発明者は、上記地盤が
沈下安定するまでに長期間を要する理由は、圧密により
ドレーン材中に導かれた水の地上への排出速度が遅くド
レーン材中に滞留し、このドレーン中の水柱圧が圧密に
よる地盤中の水のドレーン材への滲出を遅くし、地盤安
定化を遅らせていることを確かめた。このドレーン材中
の水を速やかに排出できれば圧密沈下を促進し地盤の強
度が大となるので、かかるドレーン材の構造について試
験、検討を重ね本発明を完成した。The reason why the inventor requires a long period of time for the ground to settle and stabilize is that the drainage speed of water introduced into the drain material due to consolidation into the drain material is slow and It was confirmed that the water column pressure in the drain slowed down the leaching of water in the ground into the drain material due to consolidation and delayed the stabilization of the ground. If the water in the drain material can be quickly discharged, consolidation settlement will be promoted and the ground strength will increase, so the structure of the drain material has been tested and studied, and the present invention has been completed.
【０００４】[0004]
【課題を解決するための手段】本発明によれば、合成樹
脂フィラメントを押し出し３次元的に交絡しフィラメン
ト交差部を融着形成した帯状立体網状構造体からなる芯
材の両面を多孔性不織布からなる被覆材で面接触して被
覆し、該被覆材と芯材間の少なくとも一方に長手方向に
合成樹脂製チューブを添装してなるドレーン材が提供さ
れる。すなわち、本ドレーン材の先端に地中留置用アン
カーを取り付け、所要深さまで打設し、地上部で切断す
れば、ドレーン材中に地中先端部と地上部とを導通した
チューブが装着される。この地上開口部にポンプ配管を
連結し、土中とドレーン材中の水の強制排水を可能とし
たものである。According to the present invention, both sides of a core material composed of a band-shaped three-dimensional network structure in which synthetic resin filaments are extruded and three-dimensionally entangled to form filament fusion intersections are formed from a porous nonwoven fabric. There is provided a drain material which is surface-contacted with the covering material and is provided with a synthetic resin tube in the longitudinal direction on at least one of the covering material and the core material. That is, if an anchor for subterranean indwelling is attached to the tip of the drain material, driven to the required depth, and cut at the ground portion, a tube that connects the ground tip portion and the ground portion is installed in the drain material. . A pump pipe is connected to the above-ground opening to enable forced drainage of water in the soil and drain material.
【０００５】本発明を図面に基いて説明する。図１は本
発明ドレーン材の横断面図で、図２は立体網状構造体の
斜視図である。図１に示すように立体網状構造体１の両
面を覆って多孔性不織布からなる被覆材２が接着または
融着することなく単に面接触し、この多孔性不織布から
なる被覆材２の両側縁は熱融着して閉じられている。こ
の被覆材と立体網状構造体間の一方の中央部に合成樹脂
製チューブ３が図１に示すようにドレーン材の長手方向
に添装されている。The present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view of the drain material of the present invention, and FIG. 2 is a perspective view of a three-dimensional net-like structure. As shown in FIG. 1, the covering material 2 made of a porous non-woven fabric covers both surfaces of the three-dimensional network structure 1 and is simply in surface contact without adhering or fusing, and both side edges of the covering material 2 made of the porous non-woven fabric are It is heat-sealed and closed. A synthetic resin tube 3 is attached in the longitudinal direction of the drain material as shown in FIG. 1 at one central portion between the covering material and the three-dimensional net-like structure.
【０００６】本発明の一実施例を挙げると、図２の斜視
図で示すように立体網状構造体は例えばポリアミド，ポ
リエステル，ポリ塩化ビニル，ポリアクリロニトリル等
から０．２〜０．７ｍｍ径のフィラメントを交絡し、交
差接触点は融着し、且つ図２の斜視図で示されるように
長手方向に沿った山と谷の連続体からなる厚さ２〜７ｍ
ｍ程度の三次元立体網状構造体として形成され、空隙率
が例えば８０％より大であるため土粒子によって詰まる
おそれがない。上記フィラメント径が０．２ｍｍより細
いと土圧で潰れるおそれがあり、０．７ｍｍより太いと
可撓性に劣り操作性にも問題がある。また、厚さが２ｍ
ｍより薄いと水のドレーン材中への滲出が遅く、７ｍｍ
を超えると作業性も悪く、コスト上も問題を有する。上
記網状体の両面を覆う被覆材は例えばポリアミド，ポリ
エステル，ポリアクリロニトリル，ポリエステル／ポリ
アクリルニトリル製不織布で、例えば４０ミクロンより
細粒の土粒子は捕捉されること無く通過するような細孔
分布になっており、細粒子により不織布が詰まることは
ない。ドレーン材中央部に添装されたチューブ３は、例
えばポリ塩化ビニル製で内径１．５〜４ｍｍ、外径３．
５〜６ｍｍであって、折曲げや圧密により潰れて閉塞す
るおそれがない。ドレーン材の標準的大きさは幅８０〜
１２０ｍｍで長さ１０〜４０ｍであり、チューブ部分
は、チューブの先端部がドレーン材打設時にアンカーに
より潰されないように被覆材の底部より０．３〜１ｍｍ
程度離して添装され、手元端部は被覆材部分より２〜３
ｍ程度ヘッダーパイプに接続するため延出されている。As one example of the present invention, as shown in the perspective view of FIG. 2, the three-dimensional network structure is made of, for example, polyamide, polyester, polyvinyl chloride, polyacrylonitrile or the like and has a diameter of 0.2 to 0.7 mm. 2 to 7 m in thickness, consisting of a continuous body of peaks and valleys along the longitudinal direction as shown in the perspective view of FIG.
It is formed as a three-dimensional three-dimensional network structure having a size of about m and has a porosity of, for example, greater than 80%, so that it is not likely to be clogged with soil particles. If the filament diameter is smaller than 0.2 mm, it may be crushed by earth pressure, and if it is larger than 0.7 mm, the flexibility is poor and there is a problem in operability. Also, the thickness is 2m
If the thickness is less than m, the water will seep slowly into the drain material, which is 7 mm.
If it exceeds, workability is poor and there is a problem in cost. The covering material for covering both surfaces of the reticulate body is, for example, a non-woven fabric made of polyamide, polyester, polyacrylonitrile, polyester / polyacrylonitrile, and has a pore distribution such that soil particles finer than 40 microns pass without being trapped. The fine particles do not clog the non-woven fabric. The tube 3 attached to the central portion of the drain material is made of polyvinyl chloride, for example, and has an inner diameter of 1.5 to 4 mm and an outer diameter of 3.
The length is 5 to 6 mm, and there is no possibility of being crushed and closed due to bending or consolidation. The standard size of the drain material is width 80 ~
The length is 120 mm and the length is 10 to 40 m. The tube portion is 0.3 to 1 mm from the bottom of the covering material so that the tip of the tube is not crushed by the anchor when the drain material is cast.
Attached at some distance, and the proximal end is 2 to 3 from the covering material.
It is extended to connect to the header pipe by about m.
【０００７】[0007]
【作用】本発明ドレーン材を適用し、各ドレーン材のチ
ューブに図３に示すように、ヘッダーパイプを接続し、
例えばエアコンプレッサで駆動されるダイヤフラムポン
プで各ドレーン材中の水を強制的に脱水し、圧密沈下を
促進し地盤の強度を高めることができる。以下、上記実
施例によるドレーン材を用いて実地試験を行なった結果
を述べる。なお、比較のため、チューブを添装しない他
は実施例ドレーン材と同一仕様のドレーン材による比較
試験を東京湾岸の浚渫埋立工事現場で実施した。Operation: The drain material of the present invention is applied, and a header pipe is connected to each drain material tube as shown in FIG.
For example, a diaphragm pump driven by an air compressor can forcibly dehydrate the water in each drain material to promote consolidation settlement and increase the strength of the ground. Hereinafter, the results of the field test using the drain material according to the above example will be described. For comparison, a comparative test using a drain material having the same specifications as those of the example drain material except that the tube was not attached was carried out at the dredged landfill site on the Tokyo Bay coast.
【０００８】[0008]
【実施例及び比較例】０．４ｍｍ径のポリアミドフィラ
メントを用いて図２に示すような帯状立体網状構造体を
幅９５ｍｍ、厚み３ｍｍ、長さ１４ｍ、空隙率８６％と
して形成し、該網状構造体にポリエステル／ポリアクリ
ロニトリル製不織布を網状構造体の山部が面接触するよ
うに覆い、該網状構造体と片側の被覆材との間に図１に
示すようにポリ塩化ビニル製の内径２ｍｍ，外径４ｍ
ｍ、長さ１６ｍのチューブを先端部が前記被覆材と網状
構造体の先端部より０．５ｍ離して添装し、被覆材の両
側縁を熱融着して本発明に係るドレーン材を形成した。
該ドレーン材を１２ｍ×１２ｍの埋立地の区画内に、縦
・横１ｍの間隔で１００個を図３に示すように各１ｍ深
さのサンドマット７（載荷時の吸水層）下に１０ｍの深
さにわたり先端部に地中埋設用アンカーを取り付けて打
設機により打設した。前記チューブの手元端部を外径３
０ｍｍのポリ塩化ビニル製ヘッダーパイプ４にコネクタ
ーを介して接続し、このヘッダーパイプにエアコンプレ
ッサー６で駆動されるダイヤフラムポンプ５を接続して
土中の水をドレーン材を通して排出した。２４時間連続
運転で１０日間排出を行ったところ、図３に示すように
水位は、初期水位ａから低下後水位ｂとなり、その差５
ｍにわたり水位を低下させた。なお、チューブを添装し
ない以外は同じドレーン材を１００個用いて、同様に埋
立地に打設し水位を５ｍ低下させるためには、載荷重
（サンドマットとは別に）として密度１．８ｇ／ｃｍ3
の盛土を２ｍの高さにわたり行う必要があることが判っ
た。載荷期間はほぼ同じとしても、他に盛土を集荷、運
搬し載荷する作業及び時間が必要であり、それらを本願
発明に係るドレーン材を用いることにより不要としたも
のである。Examples and Comparative Examples Using a polyamide filament having a diameter of 0.4 mm, a strip-shaped three-dimensional network structure as shown in FIG. 2 was formed with a width of 95 mm, a thickness of 3 mm, a length of 14 m and a porosity of 86%. The body is covered with a non-woven fabric made of polyester / polyacrylonitrile so that the peaks of the net-like structure are in surface contact with each other. As shown in FIG. 1, a polyvinyl chloride inner diameter of 2 mm is provided between the net-like structure and the covering on one side. Outer diameter 4m
A tube having a length of m and a length of 16 m is attached such that the tip end is 0.5 m away from the tip end of the covering material and the net-like structure, and both edges of the covering material are heat-sealed to form the drain material according to the present invention. did.
As shown in FIG. 3, 100 pieces of the drain material are placed in a landfill area of 12 m × 12 m at intervals of 1 m in length and width, and 10 m below the sand mat 7 (water absorption layer at the time of loading) with a depth of 1 m each. An anchor for underground embedding was attached to the tip end over the depth and was placed by a placing machine. The outer diameter of the proximal end of the tube is 3
A 0 mm polyvinyl chloride header pipe 4 was connected via a connector, a diaphragm pump 5 driven by an air compressor 6 was connected to this header pipe, and water in the soil was discharged through a drain material. When the water was discharged for 10 days in a continuous operation for 24 hours, the water level changed from the initial water level a to the water level b after the decrease, as shown in FIG.
The water level was lowered over m. In addition, in order to reduce the water level by 5 m by placing the same drain material in the same manner except that the tube is not attached, the density is 1.8 g / as a loading load (apart from the sand mat). cm 3
It has been found that the embankment must be carried out over a height of 2 m. Even if the loading period is almost the same, other work and time for collecting, transporting and loading the embankment are required, and these are made unnecessary by using the drain material according to the present invention.
【０００９】[0009]
【発明の効果】本発明ドレーン材を適用し、強制的に排
水することにより載荷重用の盛土を行うことなく地下水
位を低下して圧密沈下を促進し、地盤安定化に要する期
間を従来に比し大幅に短縮することができるので、経済
的効果は非常に大である。さらに本発明ドレーン材は製
造が容易で、従来のドレーン材打設機を適用でき、排水
に要する設備も低廉であるなどの利点を有する。EFFECTS OF THE INVENTION By applying the drain material of the present invention and forcibly draining it, the groundwater level is lowered without carrying out embankment for loading to promote consolidation settlement, and the period required for ground stabilization is longer than before. However, the economic effect is enormous because it can be significantly shortened. Further, the drain material of the present invention has advantages that it is easy to manufacture, a conventional drain material placing machine can be applied, and the equipment required for drainage is inexpensive.
【図１】本発明に係るドレーン材の横断面図である。FIG. 1 is a cross-sectional view of a drain member according to the present invention.
【図２】本発明ドレーン材に用いられる立体網状構造体
の斜視図である。FIG. 2 is a perspective view of a three-dimensional net-like structure used in the drain material of the present invention.
【図３】ドレーン材敷設時の概要を示す説明図である。FIG. 3 is an explanatory diagram showing an outline when a drain material is laid.
１ 立体網状構造体 ２ 被覆材 ３ 合成樹脂製チューブ ４ ヘッダーパイプ ５ ダイヤフラムポンプ ６ エアコンプレッサー ７ サンドマット ａ 初期水位 ｂ 低下後水位 1 3D reticulated structure 2 Coating material 3 Synthetic resin tube 4 Header pipe 5 Diaphragm pump 6 Air compressor 7 Sand mat a Initial water level b Water level after lowering
Claims (1)
的に交絡しフィラメント交差部を融着形成した帯状立体
網状構造体からなる芯材の両面を多孔性不織布からなる
被覆材で面接触して被覆し、該被覆材と芯材間の少なく
とも一方に長手方向に合成樹脂製チューブを添装してな
るドレーン材。1. A synthetic resin filament is extruded and entangled three-dimensionally, and the core material made of a band-shaped three-dimensional net-like structure formed by fusion-bonding filament crossing portions is covered in surface contact with a covering material made of a porous nonwoven fabric. A drain material obtained by attaching a synthetic resin tube in the longitudinal direction to at least one of the covering material and the core material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24672994A JPH0885936A (en) | 1994-09-16 | 1994-09-16 | Drain material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24672994A JPH0885936A (en) | 1994-09-16 | 1994-09-16 | Drain material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0885936A true JPH0885936A (en) | 1996-04-02 |
Family
ID=17152785
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24672994A Pending JPH0885936A (en) | 1994-09-16 | 1994-09-16 | Drain material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0885936A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20030008245A (en) * | 2001-07-16 | 2003-01-25 | 임철웅 | Embossed board drain and dehydration process by using it |
| CN107574814A (en) * | 2017-07-31 | 2018-01-12 | 中交天津港湾工程研究院有限公司 | A kind of basement process system and its construction method based on electrical heating drain bar |
-
1994
- 1994-09-16 JP JP24672994A patent/JPH0885936A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20030008245A (en) * | 2001-07-16 | 2003-01-25 | 임철웅 | Embossed board drain and dehydration process by using it |
| CN107574814A (en) * | 2017-07-31 | 2018-01-12 | 中交天津港湾工程研究院有限公司 | A kind of basement process system and its construction method based on electrical heating drain bar |
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