JPH0516492B2 - - Google Patents
Info
- Publication number
- JPH0516492B2 JPH0516492B2 JP4207687A JP4207687A JPH0516492B2 JP H0516492 B2 JPH0516492 B2 JP H0516492B2 JP 4207687 A JP4207687 A JP 4207687A JP 4207687 A JP4207687 A JP 4207687A JP H0516492 B2 JPH0516492 B2 JP H0516492B2
- Authority
- JP
- Japan
- Prior art keywords
- water
- drain
- permeable material
- soft ground
- 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
- 239000000463 material Substances 0.000 claims description 64
- 238000010276 construction Methods 0.000 claims description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- 238000000034 method Methods 0.000 description 20
- 239000004576 sand Substances 0.000 description 17
- 239000004927 clay Substances 0.000 description 11
- 230000007423 decrease Effects 0.000 description 7
- 238000007596 consolidation process Methods 0.000 description 6
- 101100495256 Caenorhabditis elegans mat-3 gene Proteins 0.000 description 5
- 239000000853 adhesive Substances 0.000 description 5
- 230000001070 adhesive effect Effects 0.000 description 5
- 239000011162 core material Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000001914 filtration Methods 0.000 description 4
- 239000011148 porous material Substances 0.000 description 4
- 239000000835 fiber Substances 0.000 description 3
- 230000001737 promoting effect Effects 0.000 description 3
- 239000002689 soil Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 229920003002 synthetic resin Polymers 0.000 description 2
- 239000000057 synthetic resin Substances 0.000 description 2
- 238000005266 casting Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 239000004745 nonwoven fabric Substances 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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）
本発明は、粘土地盤等の軟弱地盤を改良するた
めに行なわれるドレーン工法の改良技術に関す
る。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a technique for improving a drain method used to improve soft ground such as clay ground.
（従来の技術）
従来のこの種のドレーン工法としては、サンド
ドレーン工法やペーパドレーン工法等が知られて
いる。(Prior Art) As conventional drain construction methods of this type, sand drain construction methods, paper drain construction methods, and the like are known.
前者のサンドドレーン工法は、第６図に示すよ
うに、軟弱地盤２０に所要間隔のもとに砂ぐい
（サンドパイル）２１を形成し、かつ、原地盤表
面２２にはサンドマツト２３を形成して各砂ぐい
２１，２１間を上端部で連通させると共に、該サ
ンドマツト２３の上面には盛土２４を載荷して軟
弱地盤２０に対して垂直方向の圧縮応力を加える
ことによつて、土中に過剰間隙水圧を発生させ、
この水圧により地盤の間隙水を砂ぐい２１及びサ
ンドマツト２３を介して地表に速やかに排水さ
せ、もつて圧密を促進させ、地盤の強度及び変形
特性を速やかに改善するようにしたものである。 The former sand drain construction method, as shown in FIG. 6, involves forming sand piles 21 on soft ground 20 at required intervals, and forming sand piles 23 on the original ground surface 22. By making the sand pits 21, 21 communicate with each other at their upper ends, and by loading embankment 24 on the top surface of the sand pits 23 and applying compressive stress in the vertical direction to the soft ground 20, excessive stress is created in the soil. Generates pore water pressure,
This water pressure quickly drains the pore water in the ground to the ground surface through the sand pits 21 and sand mats 23, thereby promoting consolidation and promptly improving the strength and deformation characteristics of the ground.
また、後者のペーパドレーン工法は、ドレーン
材としてペーパ素材を用いたものである。 The latter paper drain construction method uses paper material as the drain material.
（問題点を解決しようとする問題点）
しかしながら、従来のドレーン工法にあつて
は、もつぱら盛土による垂直方向の圧縮応力によ
つて土中に過剰水圧を発生させるようにしたもの
であつたため、建造物の重量に相当する膨大な量
の盛土が必要になり、従つて、盛土作業及びその
後の盛土の徹去作業に多くの時間と労力とを必要
とし、コストが高くつくという問題点があつた。(Problems to be solved) However, in the conventional drain construction method, excessive water pressure was generated in the soil due to the vertical compressive stress caused by the embankment. A huge amount of embankment is required, which corresponds to the weight of the building, and therefore, the embankment work and the subsequent removal of the embankment require a lot of time and labor, resulting in high costs. Ta.
そこで、この盛土の量を少なくできるドレーン
工法についての研究開発がさかんに行なわれ、こ
れまでにも種々の方法が試みられているが、いず
れも問題点が多く実用化されるまでには至つてい
ないという現状である。 Therefore, much research and development is being carried out on drain construction methods that can reduce the amount of embankment, and various methods have been tried so far, but all of them have many problems and have not been put into practical use. The current situation is that this is not the case.
（問題点を解決するための手段）
本発明は、上述のような従来の問題点を解決す
るためになされたもので、その目的とするところ
は盛土の量が少なくてすむドレーン工法の提供に
あり、この目的を達成するために本発明のドレー
ン工法では、弾力性に優れた通水素材を小径に圧
縮した状態で、その外面を含水によりその緊締強
度が低下する緊締部材によつて緊締したドレーン
材を用いることにより、軟弱地盤内の水分で緊締
部材による通水素材の緊締を解除させ、該通水素
材の反発力によつて軟弱地盤に対して水平方向に
圧縮応力をかけるようにする工法を採用した。(Means for Solving the Problems) The present invention has been made to solve the above-mentioned conventional problems, and its purpose is to provide a drain construction method that requires less embankment. In order to achieve this objective, the drain construction method of the present invention compresses a water-permeable material with excellent elasticity to a small diameter, and tightens the outer surface of the material with a tightening member whose tightening strength decreases due to water content. By using a drain material, moisture in the soft ground releases the tightening of the water-permeable material by the tightening member, and compressive stress is applied to the soft ground in the horizontal direction by the repulsive force of the water-permeable material. The construction method was adopted.
（作用）
本発明の軟弱地盤改良用ドレーン工法では、上
述のように、弾力性に優れた通水素材を小径に圧
縮した状態で緊締したドレーン材を用い、該通水
素材の反発力を利用して軟弱地盤に対して水平方
向に圧縮応力をかけるようにしたことで、ドレー
ン材による圧密促進効果を高めることができ、従
つて、その分だけ垂直方向の圧縮応力、即ち盛土
の量が少なくてすむことになり、施工コストの大
幅な低減化が可能になる。(Function) As mentioned above, in the drain construction method for improving soft ground of the present invention, a highly elastic water-permeable material is compressed into a small diameter and tightened, and the repulsive force of the water-permeable material is utilized. By applying compressive stress in the horizontal direction to the soft ground, the consolidation promotion effect of the drain material can be enhanced, and the vertical compressive stress, that is, the amount of embankment, can be reduced accordingly. This means that construction costs can be significantly reduced.
また、緊締部材として含水によりその緊締強度
が低下する緊締部材を用いたことで、軟弱地盤内
における通水素材の緊締解除のために特別な作業
を必要とすることなく軟弱地盤内の水分を利用し
て自動的に解除させることができるようになり、
従つて、作業工程の短縮と作業能率の向上が可能
になる。 In addition, by using a tightening member whose tightening strength decreases due to water content, moisture in soft ground can be utilized without requiring special work to release the tightening of water-permeable materials in soft ground. Now you can automatically cancel it by
Therefore, it is possible to shorten the work process and improve work efficiency.
（実施例） 以下、本発明の実施例を図面により詳述する。(Example) Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
まず、本実施例のドレーン工法に用いられるド
レーン材Ａの構成を説明する。 First, the structure of the drain material A used in the drain construction method of this embodiment will be explained.
このドレーン材Ａは、複数本の円筒状通水素材
１と濾過パツク２とによつて構成されている。 This drain material A is composed of a plurality of cylindrical water-permeable materials 1 and a filter pack 2.
前記円筒状通水素材１は、第１図イに示すよう
な弾力性に優れた板状の通水素材１０を、第１図
ロに示すように圧縮しながら円筒状芯材１１の外
周に渦巻き状に巻き付けると共に、第１図ハに示
すようにその外周を複数本のテープ状緊締部材１
２によつて緊締することによつて、板状の通水素
材１０を小径の円筒状に圧縮した状態に保持させ
た構造となしている。 The cylindrical water-permeable material 1 is made by compressing a highly elastic plate-shaped water-permeable material 10 as shown in FIG. It is wound in a spiral shape, and the outer periphery is wrapped with a plurality of tape-shaped tightening members 1 as shown in FIG.
2, the plate-shaped water-permeable material 10 is held in a compressed state in a small-diameter cylindrical shape.
尚、テープ状緊締部材１２は、この実施例では
含水によりそのテープ自体の強度が低下する紙テ
ープが用いられると共に、弾力性に優れた板状の
通水素材１０として、多数本の長尺ナイロン繊維
を不規則に重合させ、各繊維の重合点を互いに溶
着させることによつて、各繊維間に連続した通水
空間を形成したもの（例えば、日本アイデイア株
式会社製の「ヘチマロン」（商標））が用いれる。 In this embodiment, the tape-shaped tightening member 12 is a paper tape whose strength decreases due to moisture content, and a large number of long nylon fibers are used as the plate-shaped water-permeable material 10 with excellent elasticity. By irregularly polymerizing fibers and welding the polymerization points of each fiber to each other, a continuous water passage space is formed between each fiber (for example, "Hechimaron" (trademark) manufactured by Nippon Idea Co., Ltd.) is used.
また、前記濾過パツク２は、前記複数本の円筒
状通水素材１，１……を収容することによつて、
各円筒状通水素材１の外表面に連続する濾過層を
形成するためのものであり、この実施例では第２
図に示すように、メツシユの小さな合成樹脂製綱
素材によりその円周方向に伸縮可能な長尺の袋状
に形成されている。 Moreover, the filter pack 2 accommodates the plurality of cylindrical water-permeable materials 1, 1...
This is to form a continuous filtration layer on the outer surface of each cylindrical water-permeable material 1, and in this embodiment, the second
As shown in the figure, it is made of a small mesh synthetic resin rope material and is formed into a long bag shape that can be expanded and contracted in the circumferential direction.
次に、本実施例の軟弱地盤改良用ドレーン工法
について説明する。尚、この実施例では粘土地盤
における圧密促進のためのドレーン工法を例にと
る。 Next, the drain construction method for improving soft ground according to this embodiment will be explained. In this embodiment, a drain method for promoting consolidation in clay ground is taken as an example.
(イ) サンドマツト施工工程（第３図イ）
まず、この工程では、原地盤Ｇを敷ならし、
十分な表面排水を行なつた後、その上面全体に
砂を積層してサンドマツト３を形成する。(B) Sand mat construction process (Figure 3B) First, in this process, the original ground G is leveled,
After sufficient surface drainage, sand is layered over the entire upper surface to form a sand mat 3.
(ロ) ケーシング打ち込み工程（第３図ロ）
この工程ではサンドマツト３上から粘土地盤
４の底部に至る長尺の円筒状ケーシング５を、
その先端シユー５ａを閉じた状態でバイブロハ
ンマまたは衝撃ハンマ等によつて垂直に打ち込
む。(B) Casing driving process (Figure 3B) In this process, a long cylindrical casing 5 is inserted from the top of the sand mat 3 to the bottom of the clay ground 4.
With the end shoe 5a closed, it is driven vertically with a vibro hammer, impact hammer, or the like.
(ハ) ドレーン材等打設工程（第３図ハ）
この工程では、まず、濾過パツク２をその内
底部に砂等の重りｇを入れた状態でケーシング
５内に落とし込んだ後、この濾過パツク２内に
複数本の円筒状通水素材１を落とし込んで垂直
に連続する長尺のドレーン材Ａをケーシング５
内に形成する。(c) Drain material casting process (Figure 3 c) In this process, first, the filter pack 2 is dropped into the casing 5 with a weight g of sand etc. placed in the inner bottom, and then this filter pack is A plurality of cylindrical water-permeable materials 1 are dropped into the casing 5 to form a vertically continuous long drain material A.
form within.
(ニ) ケーシング抜き取り工程（第３図ニ）
この工程では、ケーシング５の先端シユー５
ａを開いた状態で、該ケーシング５をクレーン
等で引き抜くことによつて、粘土地盤４内に上
面のサンドマツト３と連通するドレーンＤが形
成される。(d) Casing removal process (Fig. 3 D) In this process, the tip of the casing 5
By pulling out the casing 5 with a crane or the like with the casing a opened, a drain D communicating with the sand mat 3 on the upper surface is formed in the clay ground 4.
また、ケーシング５の抜き取りに伴つて、粘
土地盤４内の水分がドレーン材Ａ内部に侵入
し、この水分によつて紙テープより成るテープ
状緊締部材１２が含水して次第にその強度が低
下していくため、時間の経過によりテープ状緊
締部材１２が切れて円筒状通水素材１の緊締状
態が解除されるので、第４図に示すように円筒
状通水素材１自体もその反発力によつて外方へ
膨張し、この膨張力によつて粘土地盤４に対し
て水平方向に圧縮応力や常時作用した状態とな
る。 Further, as the casing 5 is removed, moisture in the clay ground 4 enters the inside of the drain material A, and the tape-shaped tightening member 12 made of paper tape becomes hydrated due to this moisture, gradually decreasing its strength. Therefore, as time passes, the tape-like tightening member 12 breaks and the tightening state of the cylindrical water-permeable material 1 is released, so that the cylindrical water-permeable material 1 itself is also affected by the repulsive force as shown in FIG. It expands outward, and due to this expansion force, a compressive stress is constantly exerted on the clay ground 4 in the horizontal direction.
(ホ) 盛土工程（第３図ホ）
この工程では、サンドマツト３の上面に盛土
６が積層される。(E) Embankment process (Figure 3 E) In this process, embankment 6 is layered on the top surface of sand mat 3.
そして、この場合の盛土６の量は、小径に圧
縮された円筒状通水素材１の反発力による水平
方向の圧縮応力によつて圧密促進効果を高めた
分だけ少なくてよいことになる。 In this case, the amount of embankment 6 can be reduced by the amount that the consolidation promotion effect is enhanced by the horizontal compressive stress due to the repulsive force of the cylindrical water-permeable material 1 compressed to a small diameter.
尚、この盛土６による垂直方向の圧縮応力
と、円筒状通水素材１の反発力による水平方向
の圧縮応力とによつて、粘土地盤４の土中に過
剰間隙水圧が発生し、この水圧によつて間隙水
はまず濾過パツク２で濾過されると共に、円筒
状通水素材１内に流れ込んでそれぞれ上方へ押
し上げられ、次いでサンドマツト３を経由して
地上に排出されることになる。 In addition, excessive pore water pressure is generated in the soil of the clay ground 4 due to the vertical compressive stress due to the embankment 6 and the horizontal compressive stress due to the repulsive force of the cylindrical water-permeable material 1. Therefore, the interstitial water is first filtered by the filter pack 2, flows into the cylindrical water-permeable material 1, is pushed upward, and is then discharged to the ground via the sand mat 3.
以上説明してきたように第１実施例の軟弱地盤
改良用ドレーン工法にあつては、上述のように、
弾力性に優れた板状通水素材１０を圧縮しながら
円筒状芯材１１の外周に渦巻き状に巻き付けた円
筒状通水素材１の反発力を利用して軟弱地盤４に
対して水平方向に圧縮応力をかけるようにしたこ
とで、ドレーン材による圧密促進効果を高めるこ
とができ、従つて、その分だけ垂直方向の圧縮応
力、即ち盛土６の量が少なくてすむことになり、
施工コストの大幅な低減化が可能になる。 As explained above, regarding the drain construction method for improving soft ground according to the first embodiment, as mentioned above,
A plate-shaped water-permeable material 10 with excellent elasticity is compressed and wound spirally around the outer periphery of a cylindrical core material 11.Using the repulsive force of the cylindrical water-permeable material 1, it is horizontally moved against the soft ground 4. By applying compressive stress, the effect of promoting consolidation by the drain material can be enhanced, and therefore, the compressive stress in the vertical direction, that is, the amount of embankment 6, can be reduced by that much.
It becomes possible to significantly reduce construction costs.
また、緊締部材１２として含水によりその緊締
強度が低下する紙テープを用いたことで、軟弱地
盤４内における円筒状通水素材１の緊締解除のた
めに特別な作業を必要とすることなく軟弱地盤４
内の水分を利用して自動的に解除させることがで
きるようになり、従つて、作業工程の短縮と作業
能率の向上が可能になる。 Furthermore, by using a paper tape whose tightening strength decreases due to water content as the tightening member 12, the soft ground 4 does not require any special work to release the tightening of the cylindrical water-permeable material 1 in the soft ground 4.
It becomes possible to automatically release the water by using the moisture inside, thereby shortening the work process and improving work efficiency.
次に、ドレーン材Ａの他の実施例を説明する。 Next, another example of the drain material A will be described.
この実施例のドレーン材Ａは、第５図イに示す
ように中心部に円筒状芯材１１を挿通した弾力性
に優れる円筒状通水素材１を、第５図ロに示すよ
うに小径に圧縮させた状態で、その外周面全体を
テープ状緊締部材１３によつて緊締した構造とな
している。 The drain material A of this embodiment is a highly elastic cylindrical water-permeable material 1 with a cylindrical core material 11 inserted through its center as shown in FIG. In the compressed state, the entire outer peripheral surface is tightened by a tape-like tightening member 13.
尚、テープ状緊締部材１３として、この実施例
では多数の通水小孔１４を有する合成樹脂製フイ
ルムが用いられ、このフイルムの両端重合部１５
を、含水によりその接着強度が低下する接着剤で
接着することによつて円筒状に形成されている。 In this embodiment, a synthetic resin film having a large number of water passage holes 14 is used as the tape-like tightening member 13, and both ends of the film overlap at 15.
is formed into a cylindrical shape by bonding them with an adhesive whose adhesive strength decreases due to water content.
また、この実施例では、各円筒状芯材１１の中
空部１１ａ内に紐体１６を挿通することよつて複
数本の円筒状通水素材１，１……を連結して１本
の連続した長尺のドレーン材Ａを形成する。 In addition, in this embodiment, by inserting the cord 16 into the hollow part 11a of each cylindrical core material 11, a plurality of cylindrical water-permeable materials 1, 1... are connected to form one continuous piece. A long drain material A is formed.
従つて、この実施例のドレーン材Ａでは、ケー
シング５の抜き取りに伴つて粘土地盤４内の水分
がドレーン材Ａまで侵入し、この水分によつて接
着剤が含水して次第にその接着強度が低下してい
くため、時間の経過によりテープ状緊締部材１３
の重合接着部が外れて円筒状通水素材１の緊締状
態が解除されるので、円筒状通水素材自体もその
反発力によつて外方へ膨張し、この膨張力によつ
て粘土地盤４に対して水平方向の圧縮応力を作用
させることができるようになる。 Therefore, in the drain material A of this embodiment, when the casing 5 is removed, moisture in the clay ground 4 penetrates into the drain material A, and the adhesive becomes hydrated due to this moisture, and its adhesive strength gradually decreases. As time passes, the tape-like tightening member 13
As the polymerized adhesive part of the cylindrical water-permeable material 1 is released and the tightened state of the cylindrical water-permeable material 1 is released, the cylindrical water-permeable material itself also expands outward due to the repulsive force, and this expansion force causes the clay ground 4 to It becomes possible to apply horizontal compressive stress to the
尚、弾力性に優れる円筒状通水材１を小径に圧
縮させる方法としては、ねじりを加える方法の他
に、次第に内径が細くなる案内筒を利用して、予
めテープ状緊締部材１３を内装した円筒内に圧入
する方法等がある。 In addition to the method of compressing the highly elastic cylindrical water-permeable material 1 to a small diameter, there is a method of twisting it, as well as a method of compressing the cylindrical water-conducting material 1 to a small diameter by using a guide tube whose inner diameter gradually becomes smaller and incorporating a tape-shaped tightening member 13 in advance. There are methods such as press fitting into a cylinder.
以上、本発明の実施例を図面により詳述してき
たが、具体的な工法及び工法に用いられる部材や
装置類の具体的構成はこの実施例に限定されるも
のではなく、本発明の要旨を逸脱しない範囲にお
ける具体的工法の変更等があつても本発明に含ま
れる。 Although the embodiments of the present invention have been described above in detail with reference to the drawings, the specific construction methods and the specific configurations of members and devices used in the construction methods are not limited to these embodiments. Even if there is a change in the specific construction method within the scope, it is included in the present invention.
例えば、実施例では、粘土地盤における圧密促
進のためのドレーン工法を例にとつたが、これに
は限られず、その他の砂地盤において地震時に上
昇する間隙水圧を逃がすための液状化対策工法と
しても利用できる。 For example, in the example, a drain construction method is used to promote consolidation in clay ground, but it is not limited to this, but it can also be used as a liquefaction countermeasure construction method to release pore water pressure that increases during an earthquake in other sandy ground. Available.
また、実施例では複数本の円筒状通水材を連結
する手段として濾過パツクを用いる場合と、紐体
を用いる場合とを示したが、これには限定され
ず、また、両者を併用するようにしてもよい。 In addition, although the examples show cases in which a filtration pack is used and a case in which strings are used as means for connecting a plurality of cylindrical water-permeable materials, the present invention is not limited to this, and it is also possible to use both in combination. You can also do this.
また、第１図イに示す板状通水素材を、メツシ
ユの小さな網素材や不織布等の濾過材より成る外
袋内に収容した状態で円筒状芯材に巻き付けるよ
うにしてもよい。従つてこの場合は円筒状通水素
材自体に濾過機能を有することになる。 Alternatively, the plate-shaped water-permeable material shown in FIG. 1A may be wrapped around the cylindrical core material while being housed in an outer bag made of a filtering material such as a small mesh material or a nonwoven fabric. Therefore, in this case, the cylindrical water-permeable material itself has a filtering function.
（発明の効果）
以上説明してきたように本発明の軟弱地盤改良
用ドレーン工法にあつては、弾力性に優れ通水素
材を小径に圧縮した状態で緊締したドレーン材を
用い、該通水素材の反発力を利用して軟弱地盤に
対して水平方向に圧縮応力をかけるようにしたこ
とで、ドレーン材による圧密促進効果を高めるこ
とができ、従つて、その分だけ垂直方向の圧縮応
力、即ち盛土の量が少なくてすむことになり、施
工コストの大幅な低減化が可能になる。(Effects of the Invention) As explained above, in the drain construction method for improving soft ground of the present invention, a drain material with excellent elasticity is compressed to a small diameter and tightened, and the water-permeable material is compressed into a small diameter and tightened. By applying compressive stress in the horizontal direction to the soft ground using the repulsive force of The amount of embankment will be small, making it possible to significantly reduce construction costs.
また、緊締部材として含水によりその緊締強度
が低下する緊締部材を用いたことで、軟弱地盤内
における通水素材の緊締解除のために特別な作業
を必要とすることなく軟弱地盤内の水分を利用し
て自動的に解除させることができるようになり、
従つて、作業工程の短縮と作業能率の向上が可能
になるという効果が得られる。 In addition, by using a tightening member whose tightening strength decreases due to water content, moisture in soft ground can be utilized without requiring special work to release the tightening of water-permeable materials in soft ground. Now you can automatically cancel it by
Therefore, it is possible to shorten the work process and improve work efficiency.
第１図は本実施例工法に用いられる円筒状通水
素材を示す説明図、第２図は同濾過パツクを示す
一部切欠斜視図、第３図は本発明の実施例工法を
示す説明図、第４図はドレーン材の膨張状態を示
す説明図、第５図はドレーン材の他の実施例を示
す説明図、第６図は従来のサンドドレーン工法を
示す断面説明図である。
Ａ……ドレーン材、１……円筒状通水素材、４
……粘土地盤（軟弱地盤）、１０……板状の通水
素材（通水素材）、１２……テープ状緊締部材
（緊締部材）、１３……テープ状緊締部材（緊締部
材）。
Fig. 1 is an explanatory diagram showing the cylindrical water-permeable material used in the construction method of this embodiment, Fig. 2 is a partially cutaway perspective view showing the same filter pack, and Fig. 3 is an explanatory diagram showing the construction method of the embodiment of the present invention. , FIG. 4 is an explanatory view showing the expanded state of the drain material, FIG. 5 is an explanatory view showing another embodiment of the drain material, and FIG. 6 is an explanatory cross-sectional view showing the conventional sand drain construction method. A... Drain material, 1... Cylindrical water-permeable material, 4
... Clay ground (soft ground), 10 ... Plate-shaped water-permeable material (water-permeable material), 12 ... Tape-like tightening member (tightening member), 13 ... Tape-like tightening member (tightening member).
Claims (1)
態で、その外面を含水によりその緊締強度が低下
する緊締部材によつて緊締したドレーン材を用い
ることにより、軟弱地盤内の水分で緊締部材によ
る通水素材の緊締を解除させ、該通水素材の反発
力によつて軟弱地盤に対して水平方向に圧縮応力
をかけるようにしたことを特徴とする軟弱地盤改
良用ドレーン工法。1. By using a drain material made of highly elastic water-permeable material compressed into a small diameter and tightened by a tightening member whose outer surface becomes damp due to water content, the tightening member can be tightened with the moisture in the soft ground. A drain construction method for improving soft ground, characterized in that the tightening of the water-permeable material is released, and compressive stress is applied to the soft ground in the horizontal direction by the repulsive force of the water-permeable material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4207687A JPS63210309A (en) | 1987-02-24 | 1987-02-24 | Draining work for improving soft ground |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4207687A JPS63210309A (en) | 1987-02-24 | 1987-02-24 | Draining work for improving soft ground |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63210309A JPS63210309A (en) | 1988-09-01 |
| JPH0516492B2 true JPH0516492B2 (en) | 1993-03-04 |
Family
ID=12625968
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4207687A Granted JPS63210309A (en) | 1987-02-24 | 1987-02-24 | Draining work for improving soft ground |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63210309A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0745621Y2 (en) * | 1989-08-08 | 1995-10-18 | 株式会社間組 | Drain material |
| US6391754B1 (en) | 1996-09-27 | 2002-05-21 | Texas Instruments Incorporated | Method of making an integrated circuit interconnect |
| JP2020193448A (en) * | 2019-05-27 | 2020-12-03 | 東急建設株式会社 | Drain material for liquefaction countermeasure, liquefaction countermeasure ground structure and construction method of liquefaction countermeasure ground structure |
| JP2020193447A (en) * | 2019-05-27 | 2020-12-03 | チカミミルテック株式会社 | Water conduction drainage material |
-
1987
- 1987-02-24 JP JP4207687A patent/JPS63210309A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63210309A (en) | 1988-09-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR102520816B1 (en) | flexible composite | |
| JP4851226B2 (en) | Improvement method for soft ground | |
| US3805535A (en) | Method for forming a body of concrete or similar material in the soil | |
| JPH0516492B2 (en) | ||
| CA2145393C (en) | Laminated fabric useful as a concrete form liner | |
| CN202787227U (en) | Three-dimensional composite plastic water discharging body | |
| JP2018080541A (en) | Composite drain body and horizontal drain consolidation method using the same | |
| JP3627771B2 (en) | Base isolation structure | |
| JPS5952024A (en) | Structure for vertical banking | |
| JP2663603B2 (en) | Ground drainage member, method of manufacturing the same, and liquefaction countermeasure method | |
| CN214169043U (en) | Concrete drainage pile with annular reinforced water-permeable sleeve | |
| JPH09119128A (en) | Weak ground consolidation expediting construction method | |
| CN210658330U (en) | Reduce bored concrete pile of anti-frictional resistance | |
| KR20030003802A (en) | Dehydrating drain for sticky and weak ground and construction method thereof | |
| WO2012131772A1 (en) | Method for improving soft ground | |
| JP3458174B2 (en) | Construction method of reinforced soil retaining wall | |
| JPH0634413Y2 (en) | Fiber drain | |
| JP3614924B2 (en) | Pile placement method | |
| JP2885043B2 (en) | Ground improvement method | |
| CN216616425U (en) | Rammed earth wall with straw rope arranged in bottom | |
| GB1600737A (en) | Drainage of soils | |
| JPH0527539Y2 (en) | ||
| JP3172449B2 (en) | Civil engineering method using permeable net | |
| JPS61113920A (en) | Draining method by use of water permeable concrete | |
| JPH0668168B2 (en) | Horizontal drain method on the seabed |