JP7407639B2 - How to lay horizontal drain material - Google Patents
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- JP7407639B2 JP7407639B2 JP2020057248A JP2020057248A JP7407639B2 JP 7407639 B2 JP7407639 B2 JP 7407639B2 JP 2020057248 A JP2020057248 A JP 2020057248A JP 2020057248 A JP2020057248 A JP 2020057248A JP 7407639 B2 JP7407639 B2 JP 7407639B2
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- 238000000034 method Methods 0.000 claims description 36
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- 235000015334 Phyllostachys viridis Nutrition 0.000 description 2
- 239000011425 bamboo Substances 0.000 description 2
- 238000011900 installation process Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 230000007480 spreading Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
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- 230000000149 penetrating effect Effects 0.000 description 1
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- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Description
本発明は、軟弱地盤での水平ドレーン材の布設方法に関する。 The present invention relates to a method for laying horizontal drain material on soft ground.
一般に、軟弱地盤の改良工法として、ドレーン材を軟弱地盤中に水平方向に埋設し、そのドレーン材の一端から地盤中に負圧をかけ、ドレーン材を通して強制的に排水するようにした水平ドレーン工法が知られている。 Generally, as a method for improving soft ground, a horizontal drain method is used in which a drain material is buried horizontally in the soft ground, and negative pressure is applied into the ground from one end of the drain material to forcibly drain water through the drain material. It has been known.
水平ドレーン材を軟弱地盤に一定の間隔で布設することは、足場さえ確保できれば容易にできるのであるが、浚渫した軟弱土を処分場に投入するような作業条件では、足場が確保されず、全く別な方法を採用せざるを得ず、例えば、泥上でも移動可能な泥上作業車を使用したり、水を張って作業船を使用することになるが、施工性が悪く、品質も不満足で、しかも、費用が高額になるという問題があった。 Laying horizontal drain materials at regular intervals on soft ground is easy if you can secure footing, but under work conditions where dredged soft soil is being dumped into a disposal site, footing cannot be secured and it is difficult to do so. We have no choice but to adopt other methods, such as using a mud truck that can move on mud or using a work boat filled with water, but the workability is poor and the quality is unsatisfactory. Moreover, there was a problem that the cost was high.
従来の水平ドレーン材の埋設は、埋設専用の台船より地盤内の所定深さ位置までマンドレルを貫入し、その状態で台船を牽引して移動させ、その移動に合わせてドレーン材をマンドレルから繰り出すことにより布設する方法が一般的であったが、埋設専用の台船を作成する費用が高額になることから、ドレーン材を予め必要な布設間隔となるよう、紐状材（ドレーン材間連結具）にて連結して網状体としておき、これを巻き取った巻体を軟弱地盤上に搬入し、これを展開することによって布設する水平ドレーン材の布設方法が提案されている（例えば、特許文献１，２参照）。 Conventional burying of horizontal drain material involves penetrating a mandrel to a predetermined depth in the ground using a barge dedicated to burying, then moving the barge by towing it, and moving the drain material from the mandrel as it moves. The common method was to lay the drain by letting it out, but since the cost of creating a barge specifically for burying was expensive, string-like material (connecting the drain materials) was A method of laying horizontal drain material has been proposed (for example, in a patent application (See References 1 and 2).
ところで、特許文献１、２により提案されている従来の水平ドレーン材の布設方法では、施工現場における作業を少なくし、経済的に水平ドレーン材の水平布設が可能なのであるが、布設間隔を保持するように連結された複数本の水平ドレーン材を巻き取った巻体から水平ドレーン材を引き出して対岸側に引き寄せることにより水平ドレーン材を軟弱地盤上に展開する際に、ドレーン材先端の搬器が軟弱地盤の抵抗を受けて地盤中に潜り込む等して、搬器の損傷や引き寄せ困難になる虞がある。すなわち、ドレーン材先端の搬器は、棒状のものであっても構造上は剛性が必要で相当の寸法・重量となるため、引き寄せる際に軟弱地盤の抵抗を受けてしまう。軟弱地盤の抵抗を避けるためにフロート構造を採用する方法もあるが、これは構造が大きくなってしまい、引き寄せた後の地盤を乱してしまうという問題がある。また、水平ドレーン材を引き寄せる作業は隣のレーンに移動する毎に繰り返し行うが、引き寄せ作業に用いるロープや紐などの牽引用部材を軟弱地盤上で所定の位置に移動させることは難しい作業である。 By the way, in the conventional horizontal drain material laying method proposed in Patent Documents 1 and 2, the work at the construction site is reduced and the horizontal drain material can be laid horizontally economically. When deploying the horizontal drain material on soft ground by pulling out the horizontal drain material from the roll wound up with multiple horizontal drain materials connected together and pulling it to the opposite shore, the carrier at the tip of the drain material was soft. There is a risk that the carrier may be damaged or difficult to pull due to resistance from the ground and the carrier sinks into the ground. That is, even if the carrier at the tip of the drain material is rod-shaped, it must be structurally rigid and has considerable size and weight, so it is subject to resistance from the soft ground when being pulled. There is a method of using a float structure to avoid the resistance of soft ground, but this has the problem of making the structure large and disturbing the ground after it is pulled. In addition, the work of pulling horizontal drain material is repeated every time it is moved to the next lane, but it is difficult to move the traction members such as ropes and strings used for the pulling work to the specified position on soft ground. .
従来の水平ドレーン材の布設方法では、水平ドレーン材を引き寄せる過程において、紐状材と軟弱地盤との接触による紐状材の屈曲により、水平ドレーン材同士が接近して布設間隔を保持できない。 In the conventional horizontal drain material installation method, in the process of pulling the horizontal drain materials, the horizontal drain materials come close to each other due to bending of the string materials due to contact with the soft ground, making it impossible to maintain the installation spacing.
また、従来の水平ドレーン材の布設方法では、水平ドレーン材を引き寄せる過程において、軟弱地盤の表面の状況は均一でないので、水平ドレーン材が蛇行してしまう虞があるが、引き寄せるだけで制御することはできない。 In addition, in the conventional method of laying horizontal drain material, the condition of the surface of the soft ground is not uniform during the process of pulling the horizontal drain material, so there is a risk that the horizontal drain material will meander, but this can be controlled by simply pulling it. I can't.
そこで、本発明の課題は、上述の如き従来の技術の実状に鑑み、水平ドレーン材を軟弱地盤上に展開する際に、軟弱地盤の凹凸によりドレーン材先端の搬器が軟弱地盤の抵抗を受けることなく、水平ドレーン材を軟弱地盤領域の対岸間に亘って引き出して確実に布設することができる軟弱地盤での水平ドレーン材の布設方法を提供することにある。 Therefore, in view of the actual state of the conventional technology as described above, an object of the present invention is to prevent the carriage at the tip of the drain material from receiving resistance from the soft ground due to the unevenness of the soft ground when horizontal drain material is deployed on the soft ground. To provide a method for laying a horizontal drain material on soft ground by which the horizontal drain material can be drawn out across the opposite bank of a soft ground area and reliably laid.
また、本発明の課題は、所定の布設間隔を保持した状態で確実に水平ドレーン材を布設することができる軟弱地盤での水平ドレーン材の布設方法を提供することにある。 Another object of the present invention is to provide a method for laying horizontal drain material on soft ground, which can reliably lay horizontal drain material while maintaining a predetermined spacing.
さらに、本発明の課題は、水平ドレーン材が蛇行することなく、水平ドレーン材を所定の位置に確実に布設することができる軟弱地盤での水平ドレーン材の布設方法を提供することにある。 A further object of the present invention is to provide a method for laying a horizontal drain material on soft ground, which can reliably lay the horizontal drain material at a predetermined position without meandering the horizontal drain material.
本発明のさらに他の課題、本発明によって得られる具体的な利点は、以下において図面を参照して説明される実施に形態から一層明らかにされる。 Further objects of the present invention and specific advantages obtained by the present invention will become clearer from the embodiments described below with reference to the drawings.
本発明では、地盤改良対象の軟弱地盤領域を挟んで主索と副索を架空し、軟弱地盤領域を挟んだ対岸間に、主索に懸垂させた搬器を副索により駆動する索道を構築する。そして、索道に沿って移動される搬器により、水平ドレーン材がロール状に巻かれた複数のドレーン材ユニットから上記複数本の水平ドレーン材を少なくとも先端側を空中に位置させた状態で上記軟弱地盤領域の対岸間に亘って引き出して上記軟弱地盤領域に布設する。 In the present invention, a main rope and a sub-rope are suspended across the soft ground area to be ground improved, and a cableway is constructed between opposite shores with the soft ground area in between, in which a carrier suspended from the main rope is driven by the sub-rope. . Then, the plurality of horizontal drain materials are moved from a plurality of roll-shaped drain material units to the soft ground with at least the tip side positioned in the air by a carrier that is moved along the cableway. It is pulled out across the opposite bank of the area and laid in the soft ground area.
すなわち、本発明は、軟弱地盤での水平ドレーン材の布設方法であって、地盤改良対象の軟弱地盤領域を挟んで配置された２台の巻上装置間に主索と副索を架空し、水平ドレーン材がロール状に巻かれた複数のドレーン材ユニットから導出された複数本の水平ドレーン材の先端を上記主索に懸垂させた搬器に固定し、上記複数のドレーン材ユニットから引き出される上記複数本の水平ドレーン材の所定長さ毎に上記複数本の水平ドレーン材間を所定間隔に保持する剛性を有した間隔保持材を取り付け、上記搬器を上記副索によって駆動することにより上記主索に沿って移動させて、上記ドレーン材ユニットから上記複数本の水平ドレーン材を少なくとも先端側を空中に位置させた状態で上記軟弱地盤領域の対岸間に亘って引き出して上記軟弱地盤領域に布設することを特徴とする。 That is, the present invention is a method for laying a horizontal drain material on soft ground, in which a main rope and a sub-rope are suspended between two hoisting devices placed across a soft ground area to be improved, The tips of a plurality of horizontal drain materials drawn out from a plurality of roll-shaped drain material units are fixed to a carrier suspended from the main rope, and the above-mentioned horizontal drain material is pulled out from the plurality of drain material units. A spacing member having rigidity that maintains a predetermined distance between the plurality of horizontal drain materials is attached to each predetermined length of the plurality of horizontal drain materials, and the main rope is moved by driving the carrier by the sub-rope. , and pull out the plurality of horizontal drain materials from the drain material unit across the opposite bank of the soft ground area with at least the tip side positioned in the air, and lay them in the soft ground area. It is characterized by
本発明に係る軟弱地盤での水平ドレーン材の布設方法は、上記複数のドレーン材ユニットから引き出された上記複数本の水平ドレーン材間を所定長さ毎にバイパス用水平ドレーン材により連結することを特徴とする。 The method for laying horizontal drain materials on soft ground according to the present invention includes connecting the plurality of horizontal drain materials pulled out from the plurality of drain material units at predetermined lengths using bypass horizontal drain materials. Features.
また、本発明に係る軟弱地盤での水平ドレーン材の布設方法は、上記複数本の水平ドレーン材の布設を完了したら、次の複数本の水平ドレーン材の布設位置に上記２台の巻上装置を移動させて、次の複数本の水平ドレーン材を布設する作業を繰り返すことにより、上記軟弱地盤領域の全体に水平ドレーン材を布設することを特徴とする。 In addition, in the method for laying horizontal drain materials on soft ground according to the present invention, after completing the laying of the plurality of horizontal drain materials, the two hoisting devices are placed at the position where the next plurality of horizontal drain materials are laid. The horizontal drain material is laid over the entire soft ground area by repeating the work of moving the horizontal drain material and laying the next plurality of horizontal drain materials.
本発明では、地盤改良対象の軟弱地盤領域を挟んで配置された２台の巻上装置間に主索と副索を架空し、軟弱地盤領域を挟んだ対岸間に、主索に懸垂させた搬器を副索により駆動する索道を構築する。そして、索道に沿って移動される搬器により、水平ドレーン材がロール状に巻かれた複数のドレーン材ユニットから複数本の水平ドレーン材を少なくとも先端側を空中に位置させた状態で上記軟弱地盤領域の対岸間に亘って引き出して布設するので、ドレーン材先端の搬器が軟弱地盤の抵抗を受けることなく、水平ドレーン材を軟弱地盤領域の対岸間に亘って引き出して確実に布設することができる。 In the present invention, a main rope and a sub-rope are suspended between two hoisting devices placed across a soft ground area to be ground improved, and suspended from the main rope between opposite banks across the soft ground area. A cableway will be constructed to drive the carrier using a sub-rope. Then, by a carrier that is moved along the cableway, a plurality of horizontal drain materials are placed in the soft ground area with at least the tip side positioned in the air from a plurality of horizontal drain material units wound in a roll shape. Since the horizontal drain material is pulled out and laid across the opposite banks of the soft ground area, the carrier at the tip of the drain material is not subjected to resistance from the soft ground, and the horizontal drain material can be pulled out and reliably laid across the opposite banks of the soft ground area.
本発明において、上記搬器によりドレーン材ユニットから引き出される複数本の水平ドレーン材は、所定長さ毎に間隔保持材を取り付けることにより、上記複数本の水平ドレーン材間を所定間隔に保持した状態で軟弱地盤領域を挟んだ対岸間に亘って展開させることができる。間隔保持材は、伸縮することなく水平ドレーン材間を所定間隔に保持する剛性を有した部材である。例えば、真竹は、間隔保持材に使用すると、軽くて滑りやすく弾力に富むので、軟弱地盤上で引っ掛かる虞が少ない。 In the present invention, the plurality of horizontal drain materials pulled out from the drain material unit by the carrier are maintained at a predetermined distance between the plurality of horizontal drain materials by attaching spacing members at each predetermined length. It can be deployed across opposite banks across soft ground areas. The spacing member is a rigid member that maintains a predetermined distance between the horizontal drain members without expanding or contracting. For example, when Madake is used as a spacing material, it is light, slippery, and highly elastic, so there is little risk of it getting caught on soft ground.
また、本発明では、地盤改良対象の軟弱地盤領域を挟んで配置された２台の巻上装置間に主索と副索を架空し、軟弱地盤領域を挟んだ対岸間に、主索に懸垂させた搬器を副索により駆動する索道を構築する。そして、索道に沿って移動される搬器により水平ドレーン材を引き出して、上記軟弱地盤領域の対岸間に亘って布設するので、水平ドレーン材が蛇行することなく、水平ドレーン材を所定の位置に確実に布設することができる。 In addition, in the present invention, the main rope and the sub-rope are suspended between two hoisting devices placed across the soft ground area to be ground improved, and the main rope is suspended between the opposite banks across the soft ground area. A cableway will be constructed to drive the loaded carrier using a sub-rope. Then, the horizontal drain material is pulled out by a carrier that moves along the cableway and laid across the opposite bank of the soft ground area, so the horizontal drain material does not meander and is securely placed in the designated position. It can be installed in
また、ドレーン材ユニットから引き出される複数本の水平ドレーン材の所定長さ毎に取り付けられる間隔保持材を主索に懸垂させた複数の搬器に取り付けて、水平ドレーン材全体を軟弱地盤領域から浮かせた状態で搬送するようにすれば、軟弱地盤領域に接触することによる水平ドレーン材の布設の課題を確実に解消することができる。 In addition, spacing maintenance materials attached to each predetermined length of multiple horizontal drain materials pulled out from the drain material unit were attached to multiple carriers suspended from the main rope, and the entire horizontal drain material was lifted off the soft ground area. By conveying the drain material in the same condition, it is possible to reliably solve the problem of laying the horizontal drain material due to contact with the soft ground area.
さらに、上記複数のドレーン材ユニットから引き出された上記複数本の水平ドレーン材間を所定長さ毎にバイパス用水平ドレーン材で連結することにより、仮に水平ドレーン材の一部に損傷が発生したとしてもバイパス用水平ドレーン材によりバイパス路を確保される。 Furthermore, by connecting the plurality of horizontal drain materials pulled out from the plurality of drain material units with bypass horizontal drain materials at predetermined lengths, even if some of the horizontal drain materials are damaged, Also, a bypass path is secured by a horizontal bypass drain material.
そして、本発明では、上記複数本の水平ドレーン材の布設を完了したら、次の複数本の水平ドレーン材の布設位置に上記２台の巻上装置を移動させて、次の複数本の水平ドレーン材を布設する作業を繰り返すことにより、上記軟弱地盤領域の全体に水平ドレーン材を効率よく迅速に布設することができる。 In the present invention, when the installation of the plurality of horizontal drain materials is completed, the two hoisting devices are moved to the installation position of the next plurality of horizontal drain materials, and the next plurality of horizontal drain materials are installed. By repeating the work of laying the material, the horizontal drain material can be efficiently and quickly laid over the entire soft ground area.
したがって、本発明によれば、水平ドレーン材を軟弱地盤上の所定の位置と間隔に確実に布設する方法を提供することができる。 Therefore, according to the present invention, it is possible to provide a method for reliably laying horizontal drain materials at predetermined positions and intervals on soft ground.
以下、本発明に係る軟弱地盤での水平ドレーン材の布設方法の実施の形態を図面を参照にして詳細に説明をする。 DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a method for laying a horizontal drain material on soft ground according to the present invention will be described in detail with reference to the drawings.
本発明は、例えば、図１に示すように、浚渫した軟弱土を投入した処分地における軟弱地盤の改良作業に適用され、その処分地１内の軟弱地盤領域２が所定の厚さになった時に、軟弱地盤領域２上に水平ドレーン材２１を布設する軟弱地盤での水平ドレーン材の布設方法である。 For example, as shown in FIG. 1, the present invention is applied to soft ground improvement work in a disposal site into which dredged soft soil has been introduced, and the soft ground area 2 in the disposal site 1 has reached a predetermined thickness. This is a method of laying horizontal drain material on soft ground, in which horizontal drain material 21 is sometimes laid on soft ground area 2.
図１は、本発明に係る軟弱地盤での水平ドレーン材の布設方法の一実施形態における水平ドレーン材２１の布設過程を示す模式図であって、（Ａ）は地盤改良対象の軟弱地盤領域２を挟んだ対岸１Ａ、１Ｂにクローラクレーン１０Ａ、１０Ｂを２台の巻上装置として配置して、対岸１Ａ、１Ｂ間に索道１３を構築した状態を示し、（Ｂ）は索道１３に沿って移動される搬器１４により複数のドレーン材ユニット２０から複数本の水平ドレーン材２１を引き出した状態を示し、（Ｃ）は複数本の水平ドレーン材２１を軟弱地盤領域２の対岸１Ａ、１Ｂ間に亘って展開した状態を示し、（Ｄ）は展開した複数本の水平ドレーン材２１を軟弱地盤領域２上に布設した状態を示している。 FIG. 1 is a schematic diagram showing the process of laying horizontal drain material 21 in an embodiment of the method for laying horizontal drain material on soft ground according to the present invention, and (A) is a soft ground area 2 to be improved. Crawler cranes 10A and 10B are placed as two hoisting devices on the opposite shores 1A and 1B, and a cableway 13 is constructed between the opposite shores 1A and 1B. (C) shows a state in which a plurality of horizontal drain materials 21 are pulled out from a plurality of drain material units 20 by a carrier 14, and (C) shows a state in which a plurality of horizontal drain materials 21 are pulled out between the opposite banks 1A and 1B of the soft ground area 2. (D) shows a state in which a plurality of horizontal drain members 21 are laid out on the soft ground region 2.
すなわち、本発明に係る軟弱地盤での水平ドレーン材の布設方法の実施形態では、図１の（Ａ）に示すように、地盤改良対象の軟弱地盤領域２を挟んだ対岸１Ａ、１Ｂにクローラクレーン１０Ａ、１０Ｂを２台の巻上装置として配置して、軟弱地盤領域２を挟んで主索１１と副索１２を架空する。そして、軟弱地盤領域２を挟んだ対岸１Ａ、１Ｂ間に、主索１１に懸垂させた搬器１４を副索１２により駆動する索道１３を構築する。上記索道１３に沿って移動される搬器１４には、ドレーン材ユニット２０から引き出された複数本の水平ドレーン材２１の先端が取り付けられている。 That is, in the embodiment of the method for laying horizontal drain material on soft ground according to the present invention, as shown in FIG. 10A and 10B are arranged as two hoisting devices, and the main rope 11 and the auxiliary rope 12 are suspended across the soft ground region 2. Then, a cableway 13 is constructed between opposite banks 1A and 1B with the soft ground region 2 in between, in which a carrier 14 suspended from the main rope 11 is driven by the sub-rope 12. The distal ends of a plurality of horizontal drain materials 21 pulled out from the drain material unit 20 are attached to the carrier 14 that is moved along the cableway 13.
索道１３は、向かい合った対岸１Ａ、１Ｂの一方から他方にケーブルを渡して構築する。 The cableway 13 is constructed by passing a cable from one side of the opposing banks 1A and 1B to the other side.
処分地１は幅が１００ｍ程で、対岸１Ａ、１Ｂに２台の巻上装置として配置されるクローラクレーン１０Ａ、１０Ｂは堤防盛土上で走行できる必要がある。なお、対岸１Ａ、１Ｂに配置される２台の巻上装置は、堤防盛土上でドレーン材ユニット２０の布設作業位置に移動できるものであれば、クローラクレーンである必要はない。 The disposal site 1 has a width of about 100 m, and the crawler cranes 10A and 10B, which are arranged as two hoisting devices on the opposite banks 1A and 1B, must be able to run on the embankment. Note that the two hoisting devices placed on the opposite banks 1A and 1B do not need to be crawler cranes as long as they can be moved to the installation work position of the drain material unit 20 on the embankment.
そして、図１の（Ｂ）に示すように、索道１３に沿って矢印Ａ方向に移動される搬器１４により、水平ドレーン材２１がロール状に巻かれた複数のドレーン材ユニット２０から複数本の水平ドレーン材２１を引き出し、図１の（Ｃ）に示すように、軟弱地盤領域２を挟んだ対岸１Ａ、１Ｂ間に亘って展開した後に、図１の（Ｄ）に示すように、展開した複数本の水平ドレーン材２１を軟弱地盤領域２上に布設する。 As shown in FIG. 1B, the horizontal drain material 21 is transferred from the plurality of drain material units 20 wound into a roll by the carrier 14, which is moved in the direction of the arrow A along the cableway 13. The horizontal drain material 21 was pulled out and deployed across the opposite banks 1A and 1B with the soft ground area 2 in between, as shown in FIG. 1(C), and then deployed as shown in FIG. 1(D). A plurality of horizontal drain materials 21 are laid on the soft ground region 2.
ここで、ドレーン材ユニット２０はテンションをかけ過ぎると水平ドレーン材としての機能が損なわれてしまうので、テンションにより水平ドレーン材としての機能が損なわれることのない範囲の引張強度で上記複数のドレーン材ユニット２０から上記複数本の水平ドレーン材２１が引き出されて軟弱地盤領域２上に布設される。 Here, if too much tension is applied to the drain material unit 20, the function as a horizontal drain material will be impaired, so the plurality of drain materials are The plurality of horizontal drain materials 21 are pulled out from the unit 20 and laid on the soft ground region 2.
ドレーン材ユニット２０から引き出される複数本の水平ドレーン材２１は、自重により懸垂曲線を描いて対岸まで引き出されることになるが、軟弱地盤領域２を挟んだ対岸１Ａ、１Ｂ間の距離が長い場合など、複数本の水平ドレーン材２１の先端側が固定された搬器１４が通過する軟弱地盤領域２の上面からの高さを十分に確保することができない場合には、中途部分が軟弱地盤領域２に接触する状態になる。しかし、先端側が搬器１４に固定された複数本の水平ドレーン材２１の先端側が軟弱地盤領域２から浮かせた状態で引き寄せられるので、水平ドレーン材２１先端の搬器１４が軟弱地盤の抵抗を受けることなく、水平ドレーン材２１を軟弱地盤領域２の対岸１Ａ、１Ｂ間に亘って引き出して確実に布設することができる。 The plurality of horizontal drain materials 21 pulled out from the drain material unit 20 will draw a catenary curve due to their own weight and be pulled out to the opposite bank, but this may occur if the distance between the opposite banks 1A and 1B across the soft ground area 2 is long. If it is not possible to secure a sufficient height from the upper surface of the soft ground area 2 through which the carrier 14 to which the distal end side of the plurality of horizontal drain materials 21 is fixed is passed, the midway portion of the horizontal drain material 21 may come into contact with the soft ground area 2. be in a state of doing so. However, since the distal ends of the plurality of horizontal drain materials 21 whose distal ends are fixed to the carrier 14 are pulled in a floating state from the soft ground area 2, the distal end of the horizontal drain materials 21, the carrier 14, is not subjected to resistance from the soft ground. , the horizontal drain material 21 can be pulled out and reliably laid between the opposite shores 1A and 1B of the soft ground region 2.
複数本の水平ドレーン材２１が布設される幅は好ましくは１０ｍ以内である。 The width over which the plurality of horizontal drain materials 21 are laid is preferably within 10 m.
ここで、本実施形態において、搬器１４は、主索１１が挿通され副索１２に固定された円環状部材からなり、軟弱地盤領域２を挟んだ対岸１Ａ、１Ｂ間に構築した索道１３に沿って対岸１Ａ、１Ｂ間を往復移動することができる。 Here, in the present embodiment, the carrier 14 is made of an annular member through which the main rope 11 is inserted and fixed to the sub-rope 12, and is used along the cableway 13 constructed between the opposite banks 1A and 1B with the soft ground region 2 in between. You can move back and forth between the opposite shores 1A and 1B.
図２は、複数のドレーン材ユニット２０から引き出した複数本の水平ドレーン材２１の状態を示す模式的な平面図である。 FIG. 2 is a schematic plan view showing the state of a plurality of horizontal drain materials 21 pulled out from a plurality of drain material units 20.
本実施形態において、複数のドレーン材ユニット２０から矢印Ａ方向に引き出された複数本の水平ドレーン材２１は、図２に示すように、搬器１４に取り付けられたロープ１５に両端が繋がれた例えば竹材を使用した間隔保持材２２に繋がれて、ドレーン材ユニット２０から所定長さ引き出される毎に一定間隔で間隔保持材２２に繋がれることにより、ドレーン材同士の間隔を一定に維持する。また、複数本の水平ドレーン材２１は、排水機能が独立しているが、損傷対策のために、ドレーン材ユニット２０から所定長さ引き出される毎に、バイパス用の水平ドレーン材２１Ａが水平ドレーン材２１に重ねられて重畳部分がステープラにて締結されることにより、バイパス用の水平ドレーン材２１Ａで連結される。 In this embodiment, as shown in FIG. The drain materials are connected to a distance maintaining material 22 made of bamboo material, and are connected to the distance maintaining material 22 at constant intervals every time a predetermined length is pulled out from the drain material unit 20, thereby maintaining a constant distance between the drain materials. In addition, the plurality of horizontal drain members 21 have independent drainage functions, but in order to prevent damage, each time a predetermined length is pulled out from the drain member unit 20, the horizontal drain member 21A for bypass is replaced with the horizontal drain member 21A. 21 and the overlapping portions are fastened together using a stapler, thereby being connected by the bypass horizontal drain material 21A.
間隔保持材２２としては、例えば長さ１０ｍ（末口３ｃｍ）程度の真竹を使用する。真竹は、軽くて滑りやすく弾力に富むので、軟弱地盤上で引っ掛かる虞が少ない。 As the spacer 22, for example, a piece of madake bamboo having a length of about 10 m (3 cm at the end) is used. Madake is light, slippery, and highly elastic, so there is little risk of it getting caught on soft ground.
複数の水平ドレーン材２１同士を連結しバイパスとなる水平ドレーン材２１Ａの間隔も例えば１０ｍ程度とする。 The interval between the horizontal drain members 21A that connect the plurality of horizontal drain members 21 and serve as a bypass is also set to about 10 m, for example.
すなわち、ここでは、対岸１Ａのクローラクレーン１０Ａ側から対岸１Ｂのクローラクレーン１０Ｂに向かって、上記搬器１４によりドレーン材ユニット２０から先端側が軟弱地盤領域２から浮かせた状態で複数本の水平ドレーン材２１が引き出され、所定長さ毎に上記複数本の水平ドレーン材２１間を所定間隔に保持する間隔保持材２２を取り付けることにより、上記複数本の水平ドレーン材２１間を所定間隔に保持した状態で軟弱地盤領域２を挟んだ対岸１Ａ、１Ｂ間に亘って展開される。 That is, here, a plurality of horizontal drain materials 21 are moved from the crawler crane 10A side on the opposite shore 1A toward the crawler crane 10B on the opposite shore 1B from the drain material unit 20 by the carrier 14 with the tip side lifted from the soft ground area 2. is pulled out, and by attaching spacing retaining members 22 that maintain a predetermined interval between the plurality of horizontal drain materials 21 at each predetermined length, the plurality of horizontal drain materials 21 are maintained at a predetermined interval. It is deployed across the opposite shores 1A and 1B across the soft ground area 2.
そして、軟弱地盤領域２を挟んだ対岸１Ａ、１Ｂ間に亘って展開された上記複数本の水平ドレーン材２１は、先端側が搬器１４から取り外されて、軟弱地盤領域２上に布設された状態とされる。 The plurality of horizontal drain materials 21 spread out between the opposite shores 1A and 1B with the soft ground region 2 in between are removed from the carrier 14 at the tip end and placed on the soft ground region 2. be done.
すなわち、本実施形態では、ドレーン材ユニット２０から引き出された複数本の水平ドレーン材２１は、中途部分が軟弱地盤領域２上を引き摺られることになるが、上記搬器１４によりドレーン材ユニット２０から先端側が軟弱地盤領域２から浮かせた状態で対岸１Ｂ側に引き寄せられ、間隔保持材２２により所定間隔を保持した状態で軟弱地盤領域２を挟んだ対岸１Ａ、１Ｂ間に亘って展開されて、所定の布設間隔を保持した状態で確実に布設される。 That is, in the present embodiment, the plurality of horizontal drain materials 21 pulled out from the drain material unit 20 are dragged on the soft ground region 2 in the middle, but the tips are pulled out from the drain material unit 20 by the carrier 14. It is drawn to the opposite bank 1B side with the side lifted from the soft ground area 2, and is expanded across the opposite bank 1A and 1B across the soft ground area 2 with a predetermined distance maintained by the spacing material 22, and a predetermined The cables are reliably installed while maintaining the cable spacing.
本実施形態の布設方法において、上記ドレーン材ユニット２０から引き出された上記複数本の水平ドレーン材２１の終端は、次のドレーン材ユニット２０から導出された複数本の水平ドレーン材２１の先端に連結され、複数のドレーン材ユニット２０から引き出されて連結された一連の複数本の水平ドレーン材２１を上記軟弱地盤領域２の全長に亘って布設する。 In the laying method of this embodiment, the terminal ends of the plurality of horizontal drain materials 21 pulled out from the drain material unit 20 are connected to the tips of the plurality of horizontal drain materials 21 led out from the next drain material unit 20. A series of horizontal drain materials 21 drawn out from a plurality of drain material units 20 and connected together are laid over the entire length of the soft ground region 2.
上記複数本の水平ドレーン材２１の布設作業を完了したら、２台の巻上装置すなわちクローラクレーン１０Ａ、１０Ｂを移動させて、次の布設位置において布設作業を行う。 When the installation work of the plurality of horizontal drain materials 21 is completed, the two hoisting devices, that is, the crawler cranes 10A and 10B are moved to perform the installation work at the next laying position.
図３は、２台の巻上装置としてクローラクレーン１０Ａ、１０Ｂを移動して次の布設位置に配置して、水平ドレーン材２１を布設する過程を示す模式図であって、（Ａ）は次の布設位置にクローラクレーン１０Ａ、１０Ｂを移動して、対岸１Ａ、１Ｂ間に索道１３を構築した状態を示し、（Ｂ）は索道１３に沿って移動される搬器１４によりドレーン材ユニット２０から複数本の水平ドレーン材２１を引き出した状態を示し、（Ｃ）は複数本の水平ドレーン材２１を対岸１Ａ、１Ｂ間に亘って展開した状態を示し、（Ｄ）は展開した複数本の水平ドレーン材２１を軟弱地盤領域２上に布設した状態を示している。 FIG. 3 is a schematic diagram showing the process of moving the crawler cranes 10A and 10B as two hoisting devices and arranging them at the next laying position to lay the horizontal drain material 21. The figure shows a state in which the crawler cranes 10A and 10B are moved to the installation position of the cableway 13 between the opposite shores 1A and 1B, and (B) shows a state where the cableway 13 is constructed between the opposite shores 1A and 1B. The main horizontal drain material 21 is shown pulled out, (C) shows the state in which multiple horizontal drain materials 21 are deployed across the opposite banks 1A and 1B, and (D) is the state in which the multiple horizontal drain materials 21 are deployed. The state in which the material 21 is laid on the soft ground area 2 is shown.
すなわち、図３の（Ａ）に示すように、地盤改良対象の軟弱地盤領域２を挟んだ対岸１Ａ、１Ｂにおいてクローラクレーン１０Ａ、１０Ｂを次の布設位置に配置して、軟弱地盤領域２を挟んで主索１１と副索１２を架空する。そして、軟弱地盤領域２を挟んだ対岸１Ａ、１Ｂ間に、主索１１に懸垂させた搬器１４を副索１２により駆動する索道１３を構築する。 That is, as shown in FIG. 3(A), the crawler cranes 10A and 10B are placed at the next laying position on opposite banks 1A and 1B across the soft ground area 2 to be ground improved, and The main rope 11 and the auxiliary rope 12 are made up. A cableway 13 is constructed between opposite banks 1A and 1B with the soft ground region 2 in between, in which a carrier 14 suspended from the main rope 11 is driven by the sub-rope 12.
次の布設位置における布設作業では、図３の（Ｂ）に示すように、対岸１Ｂのクローラクレーン１０Ｂ側から対岸１Ａのクローラクレーン１０Ａに向かって、上記搬器１４によりドレーン材ユニット２０から複数本の水平ドレーン材２１が先端側を軟弱地盤領域２から浮かせた状態で矢印Ｂ方向に引き出され、所定長さ毎に上記複数本の水平ドレーン材２１間を所定間隔に保持する間隔保持材２２を取り付けることにより、図３の（Ｃ）に示すように、上記複数本の水平ドレーン材２１間を所定間隔に保持した状態で軟弱地盤領域２を挟んだ対岸１Ａ、１Ｂ間に亘って展開される。 In the laying work at the next laying position, as shown in FIG. The horizontal drain material 21 is pulled out in the direction of arrow B with its tip side lifted from the soft ground area 2, and a spacing maintenance material 22 that maintains the plurality of horizontal drain materials 21 at a predetermined interval is attached every predetermined length. As a result, as shown in FIG. 3C, the plurality of horizontal drain members 21 are spread across the opposite banks 1A and 1B across the soft ground region 2, with the plurality of horizontal drain members 21 maintained at predetermined intervals.
そして、軟弱地盤領域２を挟んだ対岸１Ａ、１Ｂ間に亘って展開された上記複数本の水平ドレーン材２１は、図３の（Ｄ）に示すように、軟弱地盤領域２上に布設される。 The plurality of horizontal drain materials 21 spread out between the opposing shores 1A and 1B with the soft ground area 2 in between are laid on the soft ground area 2, as shown in FIG. 3(D). .
本実施形態では、図４に示すように、対岸１Ａ、１Ｂに配置した２台の巻上装置すなわちクローラクレーン１０Ａ、１０Ｂを順次の布設位置に移動させて、クローラクレーン１０Ａとクローラクレーン１０Ｂとの間で上記搬器１４によりドレーン材ユニット２０から複数本の水平ドレーン材２１をその先端側を軟弱地盤領域２から浮かせた状態で矢印Ａ方向と矢印Ｂ方向に交互に引き出して、軟弱地盤領域２を挟んだ対岸１Ａ、１Ｂ間に亘って展開し、軟弱地盤領域２上に布設する布設作業を繰り返し行う。 In this embodiment, as shown in FIG. 4, two hoisting devices, that is, crawler cranes 10A and 10B placed on opposite shores 1A and 1B are moved to successive installation positions, and the crawler crane 10A and crawler crane 10B are connected to each other. In between, a plurality of horizontal drain materials 21 are pulled out from the drain material unit 20 by the carrier 14 alternately in the direction of arrow A and the direction of arrow B with their tip sides floating above the soft ground region 2. The installation work of spreading the cable across the opposite banks 1A and 1B and laying the cable on the soft ground area 2 is repeated.
すなわち、本実施形態では、地盤改良対象の軟弱地盤領域２を挟んで主索１１と副索１２を架空し、水平ドレーン材２１がロール状に巻かれた複数のドレーン材ユニット２０から導出された上記複数本の水平ドレーン材２１の先端を上記主索１１に懸垂させた搬器１４に固定し、上記複数のドレーン材ユニット２０から引き出される上記複数本の水平ドレーン材２１の所定長さ毎に上記複数本の水平ドレーン材２１間を所定間隔に保持する間隔保持材２２を取り付け、上記搬器１４を上記副索１２によって駆動する。そして、上記複数のドレーン材ユニット２０から上記複数本の水平ドレーン材２１をその先端側を軟弱地盤領域２から浮かせた状態で引き出して上記軟弱地盤領域２に布設する。 That is, in this embodiment, the main rope 11 and the auxiliary rope 12 are suspended across the soft ground area 2 to be ground improved, and the horizontal drain material 21 is derived from a plurality of drain material units 20 wound in a roll shape. The tips of the plurality of horizontal drain materials 21 are fixed to a carrier 14 suspended from the main rope 11, and each of the plurality of horizontal drain materials 21 drawn out from the plurality of drain material units 20 is separated by a predetermined length. A spacing member 22 that maintains a predetermined spacing between the plurality of horizontal drain members 21 is attached, and the carrier 14 is driven by the auxiliary rope 12. Then, the plurality of horizontal drain materials 21 are pulled out from the plurality of drain material units 20 with their tip sides floating above the soft ground region 2 and laid in the soft ground region 2.
このようにして、上記複数本の水平ドレーン材２１間を所定間隔に保持した状態で、先端側を軟弱地盤領域２から浮かせた状態で軟弱地盤領域２を挟んだ対岸１Ａ、１Ｂ間に亘って展開させることができ、地盤の影響を受けることなく単純な作業手順で効率よく迅速に水平ドレーン材２１を布設することができ、所定の布設間隔を保持した状態で確実に水平ドレーン材２１を軟弱地盤領域２上に布設することができる。 In this way, with the plurality of horizontal drain members 21 maintained at a predetermined interval, and with the tip side floating above the soft ground area 2, the drain material 21 is stretched between the opposite banks 1A and 1B across the soft ground area 2. The horizontal drain material 21 can be laid out efficiently and quickly with a simple work procedure without being affected by the ground, and the horizontal drain material 21 can be reliably softened while maintaining a predetermined spacing. It can be installed on the ground area 2.
ここで、ドレーン材ユニット２０から引き出される複数本の水平ドレーン材２１は、自重により懸垂曲線を描いて対岸まで引き出されることになるが、軟弱地盤領域２を挟んだ対岸１Ａ、１Ｂ間の距離が短い場合など、複数本の水平ドレーン材２１の先端側が固定された搬器１４が通過する軟弱地盤領域２の上面からの高さを十分に確保することができる場合には、図５に示すように、軟弱地盤領域２に接触させることなく対岸１Ａ、１Ｂ間に亘って展開して軟弱地盤領域２上に布設することができ、水平ドレーン材２１が蛇行することなく、水平ドレーン材２１を索道１３に沿って所定の位置に確実に布設することができる。 Here, the plurality of horizontal drain materials 21 pulled out from the drain material unit 20 draw a catenary curve due to their own weight and are pulled out to the opposite bank, but the distance between the opposite banks 1A and 1B with the soft ground area 2 in between is If the height from the upper surface of the soft ground area 2 through which the carrier 14 to which the tip side of the plurality of horizontal drain materials 21 is fixed can be secured sufficiently, such as when the length of the horizontal drain material 21 is short, as shown in FIG. , the horizontal drain material 21 can be laid on the soft ground area 2 by spreading it across the opposite banks 1A and 1B without contacting the soft ground area 2, and the horizontal drain material 21 can be laid on the cableway 13 without meandering. The cable can be reliably installed in a predetermined position along the
すなわち、図５の（Ａ）に示すように、地盤改良対象の軟弱地盤領域２を挟んだ対岸１Ａ、１Ｂにクローラクレーン１０Ａ、１０Ｂを２台の巻上装置として配置して、軟弱地盤領域２を挟んで主索１１と副索１２を架空し、軟弱地盤領域２を挟んだ対岸１Ａ、１Ｂ間に、主索１１に懸垂させた搬器１４を副索１２により駆動する索道１３を構築する。そして、図５の（Ｂ）に示すように、索道１３に沿って移動される搬器１４により、水平ドレーン材２１がロール状に巻かれた複数のドレーン材ユニット２０から複数本の水平ドレーン材２１を矢印Ａ方向に引き出し、図５の（Ｃ）に示すように、複数本の水平ドレーン材２１全体を空中に浮かせた状態で軟弱地盤領域２を挟んだ対岸１Ａ、１Ｂ間に亘って展開する。このようにして図５の（Ｄ）に示すように、展開した複数本の水平ドレーン材２１を軟弱地盤領域２上の所定の位置に確実に布設することができる。 That is, as shown in FIG. 5A, crawler cranes 10A and 10B are arranged as two hoisting devices on opposite banks 1A and 1B across the soft ground area 2 to be ground improved, and the soft ground area 2 is A cableway 13 is constructed between opposite banks 1A and 1B with a soft ground region 2 sandwiched between a main rope 11 and a sub-rope 12, in which a carrier 14 suspended from the main rope 11 is driven by the sub-rope 12. As shown in FIG. 5B, a plurality of horizontal drain materials 21 are collected from a plurality of drain material units 20 in which the horizontal drain materials 21 are wound into rolls by the carrier 14 that is moved along the cableway 13. is pulled out in the direction of arrow A, and as shown in FIG. . In this way, as shown in FIG. 5D, the plurality of expanded horizontal drain materials 21 can be reliably laid at predetermined positions on the soft ground region 2.
なお、軟弱地盤領域２を挟んだ対岸１Ａ、１Ｂ間の距離が長い場合には、複数のドレーン材ユニット２０から複数本の水平ドレーン材２１を引き出して、複数本の水平ドレーン材２１全体を空中に浮かせた状態で軟弱地盤領域２を挟んだ対岸１Ａ、１Ｂ間に亘って展開しようとすると、水平ドレーン材２１に自重によるテンションが加えられることにより破損されてしまう。そのため例えば図６の（Ａ）に示すように、地盤改良対象の軟弱地盤領域２を挟んだ対岸１Ａ、１Ｂにクローラクレーン１０Ａ、１０Ｂを２台の巻上装置として配置して、軟弱地盤領域２を挟んで主索１１と副索１２を架空し、軟弱地盤領域２を挟んだ対岸１Ａ、１Ｂ間に、主索１１に懸垂させた搬器１４を副索１２により駆動する索道１３を構築する。そして、図６の（Ｂ）に示すように、索道１３に沿って移動される搬器１４により、水平ドレーン材２１がロール状に巻かれた複数のドレーン材ユニット２０から複数本の水平ドレーン材２１を引き出し、図６の（Ｃ）に示すように、索道１３に沿って矢印Ａ方向に移動される複数個の搬器１４、１４Ａ、１４Ｂ、１４Ｃにより、複数本の水平ドレーン材２１全体を空中に浮かせた状態で軟弱地盤領域２を挟んだ対岸１Ａ、１Ｂ間に亘って展開する。このようにして、図６の（Ｄ）に示すように、展開した複数本の水平ドレーン材２１を軟弱地盤領域２上の所定の位置に確実に布設することができる。ここで、上記搬器１４Ａ、１４Ｂ、１４Ｃは、例えばＳ字フック等の簡易係止具が用いられ、水平ドレーン材２１を軟弱地盤領域２上に布設した後に、人力作業などにより、間隔保持材２２から取り外される。 In addition, if the distance between the opposite banks 1A and 1B across the soft ground area 2 is long, a plurality of horizontal drain materials 21 are pulled out from a plurality of drain material units 20, and the entire plurality of horizontal drain materials 21 are placed in the air. If the horizontal drain material 21 is attempted to be deployed across the opposite shores 1A and 1B across the soft ground region 2 in a floating state, the horizontal drain material 21 will be damaged due to tension due to its own weight. Therefore, as shown in FIG. 6A, for example, crawler cranes 10A and 10B are arranged as two hoisting devices on opposite banks 1A and 1B across the soft ground area 2 to be improved. A cableway 13 is constructed between opposite banks 1A and 1B with a soft ground region 2 sandwiched between a main rope 11 and a sub-rope 12, in which a carrier 14 suspended from the main rope 11 is driven by the sub-rope 12. As shown in FIG. 6(B), a plurality of horizontal drain materials 21 are collected from a plurality of drain material units 20 in which the horizontal drain materials 21 are wound into rolls by the carrier 14 that is moved along the cableway 13. As shown in FIG. 6(C), the entire horizontal drain materials 21 are lifted into the air by a plurality of carriers 14, 14A, 14B, and 14C that are moved in the direction of arrow A along the cableway 13. It is deployed in a floating state across the opposite banks 1A and 1B across the soft ground area 2. In this way, as shown in FIG. 6(D), the plurality of expanded horizontal drain materials 21 can be reliably laid at predetermined positions on the soft ground region 2. Here, for the carriers 14A, 14B, and 14C, a simple locking device such as an S-shaped hook is used, and after the horizontal drain material 21 is laid on the soft ground area 2, the distance maintaining material 22 is moved by manual work or the like. removed from.
すなわち、ドレーン材ユニット２０から引き出される複数本の水平ドレーン材２１は、水平ドレーン材２１の自重によるテンションで破損されてしまうことのない所定の間隔毎に主索１１に懸垂させた複数個の搬器１４、１４Ａ、１４Ｂ、１４Ｃにより、全体を空中に浮かせた状態で搬送されて、軟弱地盤領域２を挟んだ対岸１Ａ、１Ｂ間に亘って展開され、蛇行することなく軟弱地盤領域２上の所定の位置に確実に布設される。 That is, the plurality of horizontal drain materials 21 pulled out from the drain material unit 20 are suspended from the main rope 11 at predetermined intervals so that the horizontal drain materials 21 are not damaged by the tension due to their own weight. 14, 14A, 14B, and 14C, the whole is transported in a suspended state in the air, and is deployed across the opposite banks 1A and 1B across the soft ground area 2, and is placed at a predetermined location on the soft ground area 2 without meandering. The cable will be securely installed in the position shown in the figure.
このように、ドレーン材ユニット２０から引き出される複数本の水平ドレーン材２１は、全体を軟弱地盤領域２から浮かせた状態で、軟弱地盤領域２を挟んだ対岸１Ａ、１Ｂ間に亘って展開することにより、軟弱地盤領域２上の所定の位置に確実に布設することができる。 In this way, the plurality of horizontal drain materials 21 pulled out from the drain material unit 20 can be spread out between the opposite shores 1A and 1B with the soft ground region 2 in between, with the whole being lifted from the soft ground region 2. Therefore, the cable can be reliably laid at a predetermined position on the soft ground area 2.
１ 処分地、
１Ａ、１Ｂ 対岸、
２ 軟弱地盤領域、
１０Ａ、１０Ｂ クローラクレーン（２台の巻上装置）、
１１ 主索、
１２ 副索、
１３ 索道、
１４、１４Ａ、１４Ｂ、１４Ｃ 搬器、
１５ ロープ、
２０ ドレーン材ユニット、
２１、２１Ａ 水平ドレーン材、
２２ 間隔保持材
1 disposal site,
1A, 1B opposite shore,
2 Soft ground area,
10A, 10B crawler crane (2 hoisting devices),
11 Main rope,
12 Auxiliary cables,
13 cableway,
14, 14A, 14B, 14C carrier,
15 rope,
20 drain material unit,
21, 21A horizontal drain material,
22 Spacing material
Claims (3)
水平ドレーン材がロール状に巻かれた複数のドレーン材ユニットから導出された複数本の水平ドレーン材の先端を上記主索に懸垂させた搬器に固定し、
上記複数のドレーン材ユニットから引き出される上記複数本の水平ドレーン材の所定長さ毎に上記複数本の水平ドレーン材間を所定間隔に保持する剛性を有した間隔保持材を取り付け、
上記搬器を上記副索によって駆動することにより上記主索に沿って移動させて、上記ドレーン材ユニットから上記複数本の水平ドレーン材を少なくとも先端側を空中に位置させた状態で上記軟弱地盤領域の対岸間に亘って引き出して上記軟弱地盤領域に布設する
ことを特徴とする軟弱地盤での水平ドレーン材の布設方法。 A main rope and a sub-rope are installed between two hoisting devices placed across the soft ground area to be improved.
Fixing the tips of a plurality of horizontal drain materials derived from a plurality of horizontal drain material units wound in a roll shape to a carrier suspended from the main rope,
Attaching a spacing maintaining member having rigidity to maintain a predetermined interval between the plurality of horizontal drain materials for each predetermined length of the plurality of horizontal drain materials pulled out from the plurality of drain material units,
The carrier is moved along the main rope by being driven by the auxiliary rope, and the plurality of horizontal drain materials are moved from the drain material unit to the soft ground area with at least the tip side positioned in the air. A method for laying horizontal drain material on soft ground, characterized by pulling it out across the opposite bank and laying it on the soft ground area.
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| JP2745324B2 (en) * | 1989-05-12 | 1998-04-28 | タキロン株式会社 | Geotextile for embankment |
| JPH03148393A (en) * | 1989-11-06 | 1991-06-25 | Penta Ocean Constr Co Ltd | Maneuvering method of laying vessel for laying horizontal drain members and its device |
| JPH0768694B2 (en) * | 1990-11-30 | 1995-07-26 | 五洋建設株式会社 | How to operate a horizontal drain material buried ship |
| JP2881516B2 (en) * | 1991-05-13 | 1999-04-12 | 佐伯建設工業株式会社 | Equipment for laying coating materials on soft ground |
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|---|---|---|---|---|
| US4244664A (en) | 1978-02-22 | 1981-01-13 | Duverne Jean Claude | Method and apparatus for on-site treatment of mud and silt |
| JP2010236354A (en) | 2010-07-08 | 2010-10-21 | Penta Ocean Construction Co Ltd | Installation method of horizontal drain material for improving soft ground |
| JP5510866B2 (en) | 2010-07-08 | 2014-06-04 | 五洋建設株式会社 | Laying of horizontal drain material for soft ground improvement |
| JP2012102584A (en) | 2010-11-12 | 2012-05-31 | Penta Ocean Construction Co Ltd | Method and apparatus for horizontally burying drain material |
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