JP2018080541A - Composite drain body and horizontal drain consolidation method using the same - Google Patents

Composite drain body and horizontal drain consolidation method using the same Download PDF

Info

Publication number
JP2018080541A
JP2018080541A JP2016224710A JP2016224710A JP2018080541A JP 2018080541 A JP2018080541 A JP 2018080541A JP 2016224710 A JP2016224710 A JP 2016224710A JP 2016224710 A JP2016224710 A JP 2016224710A JP 2018080541 A JP2018080541 A JP 2018080541A
Authority
JP
Japan
Prior art keywords
drain
horizontal drain
composite
horizontal
materials
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.)
Granted
Application number
JP2016224710A
Other languages
Japanese (ja)
Other versions
JP6886575B2 (en
Inventor
博 新舎
Hiroshi Niiya
博 新舎
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Penta Ocean Construction Co Ltd
Original Assignee
Penta Ocean Construction Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Penta Ocean Construction Co Ltd filed Critical Penta Ocean Construction Co Ltd
Priority to JP2016224710A priority Critical patent/JP6886575B2/en
Publication of JP2018080541A publication Critical patent/JP2018080541A/en
Application granted granted Critical
Publication of JP6886575B2 publication Critical patent/JP6886575B2/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Landscapes

  • Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a composite drain body and a horizontal drain consolidation method capable of burying a horizontal drain material at regular intervals and capable of promoting consolidation efficiently.SOLUTION: This composite drain body 1 comprises an extending rigid member 3 disposed between adjacent horizontal drain members 2, 2 and an auxiliary drain member 4 having water permeability disposed between the adjacent horizontal drain materials 2, 2. The horizontal drain material 2, auxiliary drain member 4, and extending rigid member 3 are integrally laminated. By embedding this composite drain body 1 in a soft ground, it is possible to embed each horizontal drain material 2, 2 while keeping them in communication with each other at intervals.SELECTED DRAWING: Figure 1

Description

本発明は、主に地盤改良や処理場の減容化に使用される複合ドレーン体及びそれを使用した水平ドレーン圧密工法に関する。   The present invention relates to a composite drain body mainly used for ground improvement and volume reduction of a treatment plant, and a horizontal drain consolidation method using the same.

従来、水面下の軟弱地盤を圧密改良する方法として、軟弱地盤中に互いに間隔をおいて水平に向けた複数の水平ドレーン材を多段配置に埋設し、各水平ドレーン材を通して地盤中より吸水する水平ドレーン圧密工法が知られている（例えば、特許文献１を参照）。   Conventionally, as a method for improving the consolidation of soft ground under the surface of the water, horizontal drain materials are embedded in multiple stages in the soft ground and spaced horizontally from each other, and water is absorbed from the ground through each horizontal drain material. A drain consolidation method is known (see, for example, Patent Document 1).

各水平ドレーン材は、軟弱地盤中に水平方向及び垂直方向に所定の間隔をおいて埋設され、例えば、所定の厚みまで軟弱土を水中に投入する工程と、投入された軟弱土上に各ドレーン材を並べて敷設する工程とを繰り返すことにより軟弱地盤中に水平方向及び垂直方向に所定の間隔をおいて埋設する方法や埋設船を使用して多段に埋設する方法により設置される。   Each horizontal drain material is embedded in the soft ground at predetermined intervals in the horizontal and vertical directions, for example, a step of pouring the soft soil into the water to a predetermined thickness, and each drain on the soft soil It is installed by a method of burying in the soft ground by a predetermined interval in the horizontal direction and the vertical direction by repeating the step of laying the materials side by side or a method of burying in multiple stages using a buried ship.

この水平ドレーン工法では、各水平ドレーン材の一端が排水ホースを介して集水管に接続され、集水管に接続された真空ポンプによって各水平ドレーン材に負圧を作用させるようになっている。   In this horizontal drain construction method, one end of each horizontal drain material is connected to a water collecting pipe via a drain hose, and a negative pressure is applied to each horizontal drain material by a vacuum pump connected to the water collecting pipe.

また、各水平ドレーン材内を減圧させる方法には、水中に設置した縦向き筒状の排水ポンプ室に集水管を介して水平ドレーン材を連通させ、排水ポンプ室内より水中ポンプを利用して排水し、室内の水位を低下させ、排水ポンプ室内外の水頭差によって水平ドレーン材内を減圧させる方法も知られている（例えば、特許文献２を参照）。   Also, in order to reduce the pressure inside each horizontal drain material, the horizontal drain material is communicated with a vertical cylindrical drainage pump chamber installed in water via a water collecting pipe, and drainage is performed using a submersible pump from the drainage pump chamber. A method is also known in which the water level in the room is lowered, and the inside of the horizontal drain material is depressurized by the difference in water head inside and outside the drainage pump (see, for example, Patent Document 2).

そして、この水平ドレーン工法では、各水平ドレーン材内を減圧させた際、図９（ｂ）に示すように、その有効範囲が各水平ドレーン材２を中心とした円柱粘土塊に作用すると考えられている。   And in this horizontal drain construction method, when the pressure in each horizontal drain material is reduced, the effective range is considered to act on a cylindrical clay block centering on each horizontal drain material 2 as shown in FIG. 9 (b). ing.

特開２００２−０３０６４６号公報JP 2002-030646 A 特開２００３−２６１９２９号公報JP 2003-261929 A

しかしながら、上述の如き従来の技術では、軟弱土に負圧を作用させるために真空ポンプや排水ポンプ室内の水中ポンプを稼働させなければならないことから、効率よく圧密を促進し、ポンプ稼働に伴う運転コストの軽減を図る手段が求められている。   However, in the conventional technology as described above, since the vacuum pump and the submersible pump in the drainage pump chamber must be operated in order to apply the negative pressure to the soft soil, the consolidation is efficiently promoted and the operation accompanying the pump operation is performed. There is a need for means to reduce costs.

一方、ポンプによる負圧は、図９（ｂ）に示すように、水平ドレーン材を中心に作用するため、効率よく軟弱地盤に負圧を作用させるためには、各水平ドレーン材間の間隔が一定とすべきところ、従来の敷設方法では、各水平ドレーン材の間隔を一定に保つことが困難であるという問題があった。   On the other hand, as shown in FIG. 9 (b), the negative pressure by the pump acts on the horizontal drain material, so in order to efficiently apply the negative pressure to the soft ground, the interval between the horizontal drain materials is However, the conventional laying method has a problem that it is difficult to keep the interval between the horizontal drain members constant.

そこで、本発明は、このような従来の問題に鑑み、水平ドレーン材を等間隔に埋設することができ、且つ、効率よく圧密を促進することができる複合ドレーン体及び水平ドレーン圧密工法の提供を目的としてなされたものである。   Therefore, in view of such conventional problems, the present invention provides a composite drain body and a horizontal drain consolidation method capable of burying horizontal drain materials at equal intervals and efficiently promoting consolidation. It was made as a purpose.

上述の如き従来の問題を解決するための請求項1に記載の発明の特徴は、軟弱地盤中に互いに間隔をおいて水平に埋設される複数の水平ドレーン材を備えた複合ドレーン体であって、隣り合う水平ドレーン材間に渡って配置され、各水平ドレーン材間を一定間隔に保持する展張用剛性部材と、隣り合う前記水平ドレーン材間に渡って配置される透水性を有する補助ドレーン部材とを備え、前記水平ドレーン材、前記補助ドレーン部材及び前記展張用剛性部材が一体的に積層されている複合ドレーン体にある。   The feature of the invention according to claim 1 for solving the conventional problems as described above is a composite drain body comprising a plurality of horizontal drain members embedded horizontally in a soft ground at intervals. A rigid member for expansion that is arranged between adjacent horizontal drain materials and holds the horizontal drain materials at a fixed interval; and an auxiliary drain member having water permeability that is arranged between adjacent horizontal drain materials. And the horizontal drain member, the auxiliary drain member, and the expansion rigid member are integrally laminated.

請求項２に記載の発明の特徴は、請求項１の構成に加え、前記展張用剛性部材は、樹脂材によって網状又は格子状に形成されていることにある。   According to a second aspect of the present invention, in addition to the configuration of the first aspect, the expansion rigid member is formed of a resin material in a net shape or a lattice shape.

請求項３に記載の発明の特徴は、請求項１又は２の構成に加え、前記補助ドレーン部材は、多数の繊維体を撚った紐材からなることにある。   A feature of the invention described in claim 3 is that, in addition to the configuration of claim 1 or 2, the auxiliary drain member is made of a string material in which a large number of fiber bodies are twisted.

請求項４に記載の発明の特徴は、請求項１又は２の構成に加え、前記補助ドレーン部材は、透水性素材をもってシート状に形成されていることにある。   The feature of the invention described in claim 4 is that, in addition to the configuration of claim 1 or 2, the auxiliary drain member is formed in a sheet shape with a water-permeable material.

請求項５に記載の発明の特徴は、軟弱土を投入する工程と、所定の厚みまで軟弱土を投入する毎に投入した軟弱土上に複数の水平ドレーン材を並べて敷設する工程とを繰り返し、軟弱地盤中に複数の水平ドレーン材を埋設し、前記水平ドレーン材より吸水するようにした水平ドレーン圧密工法において、互いに間隔を置いて並べられた複数の水平ドレーン材と、隣り合う水平ドレーン材間に渡って配置され、該各水平ドレーン材間を一定に保持する展張用剛性体と、隣り合う前記水平ドレーン材間に渡って配置される透水性を有する補助ドレーン部材とが一体的に積層されてなる複合ドレーン体を使用し、投入した軟弱土が一定厚みに達する毎に前記前記複合ドレーン体を展開し、展開した前記複合ドレーン体を投入された軟弱土上に敷設し、しかる後、敷設された前記複合ドレーン体上に軟弱土を投入することにある。   The feature of the invention described in claim 5 is to repeat the step of throwing soft soil and the step of laying a plurality of horizontal drain materials side by side on the soft soil thrown every time the soft soil is thrown to a predetermined thickness, In the horizontal drain consolidation method in which a plurality of horizontal drain materials are embedded in soft ground and absorb water from the horizontal drain materials, a plurality of horizontal drain materials arranged at intervals from each other and between adjacent horizontal drain materials A spreading rigid body that is disposed across the horizontal drain members and a water permeable auxiliary drain member that is disposed between the adjacent horizontal drain members are integrally laminated. The composite drainage body is used, and the composite drainage body is expanded each time the input soft soil reaches a certain thickness, and the expanded composite drainage body is laid on the input soft soil. Thereafter, in placing the soft soil on the laid the composite drain body.

請求項６に記載の発明の特徴は、請求項５の構成に加え、前記複合ドレーン体を巻き体としておき、投入した軟弱土が一定厚みに達する毎に前記巻き体を水上で展開することにある。   According to a sixth aspect of the present invention, in addition to the configuration of the fifth aspect, the composite drained body is used as a wound body, and the wound body is developed on the water every time the soft soil that has been introduced reaches a certain thickness. is there.

請求項７に記載の発明の特徴は、請求項５又は６の構成に加え、縦向き筒状の排水ポンプ室を水中に設置しておき、沈下させた前記複合ドレーン体の各水平ドレーン材を前記排水ポンプ室に連通させておき、しかる後、前記排水ポンプ室内より排水することにより室内の水位を低下させ、該排水ポンプ室内外の水頭差によって前記各水平ドレーン材内を減圧させることにある。   The feature of the invention described in claim 7 is that, in addition to the configuration of claim 5 or 6, a horizontal cylindrical drainage pump chamber is installed in the water, and each horizontal drain material of the composite drainage body submerged is In communication with the drainage pump chamber, and then draining from the drainage pump chamber, the water level in the chamber is lowered, and the inside of each horizontal drain material is depressurized by the head difference between the drainage pump chamber and the outside. .

本発明に係る複合ドレーン体は、上述したように、軟弱地盤中に互いに間隔をおいて水平に埋設される複数の水平ドレーン材を備えた複合ドレーン体であって、隣り合う水平ドレーン材間に渡って配置され、各水平ドレーン材間を一定間隔に保持する展張用剛性部材と、隣り合う前記水平ドレーン材間に渡って配置される透水性を有する補助ドレーン部材とを備え、前記水平ドレーン材、前記補助ドレーン部材及び前記展張用剛性部材が一体的に積層されていることにより、水平ドレーン材間の間隔を常に一定に保つことができ、容易に水平ドレーン材を埋設することができるとともに、各水平ドレーン材間の連通を確保し、高い圧密効果を得ることができる。   The composite drain body according to the present invention, as described above, is a composite drain body including a plurality of horizontal drain materials embedded horizontally in the soft ground at intervals, and between adjacent horizontal drain materials. The horizontal drain material, comprising: a rigid member for expansion that is disposed across the horizontal drain material at a constant interval; and an auxiliary drain member having water permeability that is disposed between the adjacent horizontal drain materials. Since the auxiliary drain member and the expansion rigid member are integrally laminated, the interval between the horizontal drain materials can be always kept constant, and the horizontal drain material can be easily embedded, Communication between the horizontal drain materials can be secured and a high consolidation effect can be obtained.

また、本発明において、前記展張用剛性部材は、樹脂材によって網状又は格子状に形成されていることによって、幅及び長手方向の圧縮力及び引張力に対し一定の剛性を発揮するとともに、巻き取り可能な程度に可撓性を有する。   Further, in the present invention, the stretching rigid member is formed in a net-like or lattice-like shape by a resin material, thereby exhibiting a certain rigidity with respect to the compressive force and tensile force in the width and longitudinal direction, and winding up. Be as flexible as possible.

更に、本発明において、前記補助ドレーン部材は、多数の繊維体を撚った紐材からなることにより、簡易な部材で水平ドレーン材間の連通を確保することができる。   Furthermore, in this invention, the said auxiliary | assistant drain member consists of the string material which twisted many fiber bodies, and can ensure the communication between horizontal drain materials with a simple member.

さらにまた、本発明において、前記補助ドレーン部材は、透水性素材をもってシート状に形成されていることにより、隣り合う水平ドレーン材の全体を互いに連通させることができる。   Furthermore, in the present invention, the auxiliary drain member is formed in a sheet shape with a water-permeable material, whereby the entire adjacent horizontal drain members can communicate with each other.

本発明方法は、軟弱土を投入する工程と、所定の厚みまで軟弱土を投入する毎に投入した軟弱土上に複数の水平ドレーン材を並べて敷設する工程とを繰り返し、軟弱地盤中に複数の水平ドレーン材を埋設し、前記水平ドレーン材より吸水するようにした水平ドレーン圧密工法において、互いに間隔を置いて並べられた複数の水平ドレーン材と、隣り合う水平ドレーン材間に渡って配置され、該各水平ドレーン材間を一定に保持する展張用剛性体と、隣り合う前記水平ドレーン材間に渡って配置される透水性を有する補助ドレーン部材とが一体的に積層されてなる複合ドレーン体を使用し、投入した軟弱土が一定厚みに達する毎に前記前記複合ドレーン体を展開し、展開した前記複合ドレーン体を投入された軟弱土上に敷設し、しかる後、敷設された前記複合ドレーン体上に軟弱土を投入することにより、水平ドレーン材をその間隔を一定に保った状態で容易に埋設することができ、軟弱地盤を均一に圧密することができるとともに、水平ドレーン材間の連通が確保されているので圧密を促進することができる。   The method of the present invention repeats a step of throwing soft soil and a step of laying a plurality of horizontal drain materials side by side on the soft soil thrown every time soft soil is thrown to a predetermined thickness, and a plurality of the soil is put in soft ground. In the horizontal drain consolidation method in which a horizontal drain material is buried and water is absorbed from the horizontal drain material, a plurality of horizontal drain materials arranged at intervals from each other, and arranged between adjacent horizontal drain materials, A composite drainage body in which a spreading rigid body that maintains a constant space between the horizontal drain materials and a water-permeable auxiliary drain member that is disposed between adjacent horizontal drain materials are integrally laminated. Each time the used soft soil reaches a certain thickness, the composite drain body is expanded, and the expanded composite drain body is laid on the input soft soil, and then laid. By placing soft soil on the composite drainage body, the horizontal drain material can be easily embedded with its interval kept constant, and the soft ground can be uniformly consolidated and horizontal Consolidation can be promoted because communication between drain materials is secured.

更に、本発明において、前記複合ドレーン体を巻き体としておき、投入した軟弱土が一定厚みに達する毎に前記巻き体を水上で展開することにより、容易に運搬することができ、且つ、水平ドレーン材間の間隔を保った状態で容易に展開することができる。   Furthermore, in the present invention, the composite drained body is used as a wound body, and the rolled body is developed on the water each time the charged soft soil reaches a certain thickness. It can be easily deployed with the spacing between the materials maintained.

更にまた、本発明において、縦向き筒状の排水ポンプ室を水中に設置しておき、沈下させた前記複合ドレーン体の各水平ドレーン材を前記排水ポンプ室に連通させておき、しかる後、前記排水ポンプ室内より排水することにより室内の水位を低下させ、該排水ポンプ室内外の水頭差によって前記各水平ドレーン材内を減圧させることにより、軟弱地盤に効率よく負圧を作用させることができる。   Furthermore, in the present invention, a vertically-oriented cylindrical drainage pump chamber is installed in the water, and each horizontal drain material of the composite drainage body that has been sunk is communicated with the drainage pump chamber. By draining from the drainage pump chamber, the water level in the chamber is lowered, and the inside of each horizontal drain material is depressurized by the head difference between the interior and exterior of the drainage pump chamber, whereby a negative pressure can be efficiently applied to the soft ground.

本発明に係る複合ドレーン体の一例を示す平面図である。It is a top view which shows an example of the composite drain body which concerns on this invention. 同上の分解斜視図である。It is an exploded perspective view same as the above. 同上の複合ドレーン体を巻き取った状態を示す斜視図である。It is a perspective view which shows the state which wound up the composite drain body same as the above. 本発明に係る水平ドレーン圧密工法における軟弱土投入工程の概略を示す断面図である。It is sectional drawing which shows the outline of the soft soil injection | throwing-in process in the horizontal drain consolidation method which concerns on this invention. 同上の複合ドレーン体展張工程の概略を示す概略平面図である。It is a schematic plan view which shows the outline of a composite drain body extending process same as the above. 同上の複合ドレーン体敷設工程の概略を示す概略平面図である。It is a schematic plan view which shows the outline of a composite drain body laying process same as the above. 同上の概略縦断面図である。It is a schematic longitudinal cross-sectional view same as the above. 同上の圧密作業の概略を示す横断面図、（ｂ）は同縦断面図である。The cross-sectional view which shows the outline of the consolidation work same as the above, (b) is the longitudinal cross-sectional view. 水平ドレーン材による負圧作用有効範囲を比較した概略断面図である。It is the schematic sectional drawing which compared the negative pressure action effective range by a horizontal drain material. 同上の圧密効果を比較したグラフである。It is the graph which compared the consolidation effect same as the above.

次に、本発明に係る複合ドレーン体の実施態様を図１〜図１０に示した実施例に基づいて説明する。尚、図中符号１は、複合ドレーン体である。   Next, an embodiment of the composite drain body according to the present invention will be described based on the examples shown in FIGS. In the figure, reference numeral 1 denotes a composite drain body.

この複合ドレーン体１は、水平ドレーン圧密工法に使用されるものであって、図に示すように、水平に向けた複数の水平ドレーン材２，２...が互いに間隔をおいた平行配置に備えられている。   This composite drain body 1 is used in a horizontal drain consolidation method, and as shown in the figure, a plurality of horizontal drain materials 2, 2. Is provided.

また、この複合ドレーン体１は、図１、図２に示すように、隣り合う水平ドレーン材２，２...間に渡って配置され、各水平ドレーン材２，２...間を一定間隔に保持する展張用剛性部材３と、隣り合う水平ドレーン材２，２...間に渡って配置される透水性を有する補助ドレーン部材４とを備え、水平ドレーン材２，２...、補助ドレーン部材４及び展張用剛性部材３が一体的に積層されている。   Further, as shown in FIGS. 1 and 2, the composite drain body 1 is arranged between adjacent horizontal drain materials 2, 2,... A stretching rigid member 3 held at an interval, and a water permeable auxiliary drain member 4 disposed between adjacent horizontal drain materials 2, 2... The auxiliary drain member 4 and the expansion rigid member 3 are integrally laminated.

尚、本実施例では、水平ドレーン材２，２...、補助ドレーン部材４、展張用剛性部材３の順に積層されているが、水平ドレーン材２，２...を補助ドレーン部材４と展張用剛性部材３との間に重ねてもよい。   In this embodiment, the horizontal drain members 2, 2..., The auxiliary drain member 4, and the expansion rigid member 3 are laminated in this order, but the horizontal drain members 2, 2. You may overlap between the rigid member 3 for spreading.

水平ドレーン材２，２...は、プラスチックボードドレーンを使用し、特に図示しないが、断面がジグザク状に形成された帯状の心材と、心材の外面を覆う布状の透水材とを備え、透水材を通して内外で通水できるようになっている。   The horizontal drain material 2, 2 ... uses a plastic board drain, and includes a strip-shaped core material having a zigzag cross section and a cloth-like water-permeable material covering the outer surface of the core material, although not particularly illustrated. Water can be passed inside and outside through a water-permeable material.

各水平ドレーン材２，２...は、その端部にキャップ５が連結され、キャップ５を介して集水管６に連結されるようになっている。   Each horizontal drain member 2, 2... Has a cap 5 connected to its end, and is connected to the water collecting pipe 6 via the cap 5.

展張用剛性部材３は、図２に示すように、高密度ポリエチレン等の樹脂からなる縦材３ａ及び横材３ｂが交差する網状に形成され、幅方向及び長さ方向の圧縮力及び引張力に対し一定の剛性を備えているとともに、厚み方向において巻取り可能な程度の可撓性を有ししている。   As shown in FIG. 2, the stretchable rigid member 3 is formed in a net shape in which a longitudinal member 3a and a transverse member 3b made of a resin such as high-density polyethylene intersect, and the compressive force and tensile force in the width direction and the length direction are applied. On the other hand, it has a certain rigidity and is flexible enough to be wound in the thickness direction.

この展張用剛性部材３は、その幅及び長さに対し十分に網目ピッチの小さいものを使用し、例えば、水平ドレーン材２，２...の間隔を３ｍとする場合、幅２１ｍ×長さ１００ｍ、網目のピッチが９３ｍｍ×９３ｍｍのものを使用する。   As the rigid member 3 for expansion, a member having a sufficiently small mesh pitch with respect to the width and length is used. For example, when the interval between the horizontal drain members 2, 2. Use a 100 m mesh with a mesh pitch of 93 mm x 93 mm.

尚、展張用剛性部材３には、一般に市販されている園芸用の樹脂製ネットを利用することができる。   Note that a resin net for horticulture that is generally available on the market can be used as the rigid member 3 for spreading.

そして、この展張用剛性部材３には、その片面側に補助ドレーン部材４が接着テープなどによって接着されている。   Then, the auxiliary drain member 4 is bonded to one side of the expanding rigid member 3 with an adhesive tape or the like.

補助ドレーン部材４は、多数のポリエステル繊維等の繊維体を撚った紐材４ａを格子状に編み込むことによって網状に形成され、各紐体４ａの繊維体間を通して通水できるようになっている。   The auxiliary drain member 4 is formed in a net shape by weaving a string material 4a in which a large number of fiber bodies such as polyester fibers are twisted into a lattice shape, and allows water to pass through between the fiber bodies of each string body 4a. .

補助ドレーン部材４の表面には、各水平ドレーン材２，２...が紐材４ａと接した状態に結束具によって固定され、各水平ドレーン材２，２...は、紐材４ａを介して互いに連通されている。   The horizontal drain members 2, 2... Are fixed to the surface of the auxiliary drain member 4 by a binding tool in contact with the string member 4a. The horizontal drain members 2, 2. Are in communication with each other.

尚、補助ドレーン部材４は、上記実施例に限定されず、例えば、不織布等の透水性素材をもってシート状に形成したものであってもよい。   In addition, the auxiliary drain member 4 is not limited to the said Example, For example, what was formed in the sheet form with water-permeable materials, such as a nonwoven fabric, may be sufficient.

このように構成された複合ドレーン体１は、各水平ドレーン材２，２...間の間隔が展張用剛性部材３の剛性によって常に一定に保持されるとともに、各水平ドレーン材２，２...間が補助ドレーン部材４によって互いに連通した状態になっている。   The composite drain body 1 configured in this way is always kept constant by the rigidity of the stretching rigid member 3 while the interval between the horizontal drain members 2, 2. .. Are in communication with each other by the auxiliary drain member 4.

一方、この複合ドレーン体１は、水平ドレーン材２，２...、補助ドレーン部材４及び展張用剛性部材３がそれぞれ厚み方向に可撓性及び柔軟性を備えており、図３に示すように、ロール状に巻き取った巻き体１Ａとすることができるようになっている。   On the other hand, in this composite drain body 1, the horizontal drain members 2, 2..., The auxiliary drain member 4, and the expansion rigid member 3 are each provided with flexibility and flexibility in the thickness direction, as shown in FIG. Moreover, it can be set as the wound body 1A wound up in a roll shape.

次に、この複合ドレーン体１を使用した水平ドレーン圧密工法について説明する。尚、図中符号１０は、護岸１１に囲まれた軟弱土処分場であって、軟弱土１２を順次投入するとともに、投入された軟弱土１２を水平ドレーン圧密工法によって圧密改良するようになっている。   Next, a horizontal drain consolidation method using this composite drain body 1 will be described. Reference numeral 10 in the figure denotes a soft soil disposal site surrounded by the revetment 11, and the soft soil 12 is sequentially introduced, and the soft soil 12 that has been fed is consolidated and improved by a horizontal drain consolidation method. Yes.

先ず、事前に工場において、展張用剛性部材３の片面に補助ドレーン部材４を固定し、補助ドレーン部材４の表面に互いに間隔を置いて各水平ドレーン材２，２...を固定し、３層構造の複合ドレーン体１を製造する。   First, in the factory, the auxiliary drain member 4 is fixed to one side of the expansion rigid member 3 in advance, and the horizontal drain members 2, 2... Are fixed to the surface of the auxiliary drain member 4 at intervals from each other. A layered composite drain body 1 is produced.

そして、この複合ドレーン体１をロール状に巻取って巻き体１Ａとし、その状態で工場より施工現場に搬送する。   And this composite drain body 1 is wound up in roll shape, it is set as the wound body 1A, and it conveys to the construction site from the factory in that state.

次に、本発明に係る水平ドレーン圧密工法の具体的な手順について説明する。   Next, a specific procedure of the horizontal drain consolidation method according to the present invention will be described.

先ず、図４に示すように、処分場１０内に所定の厚みに至るまで第１段目の軟弱土１２を投入し（軟弱土投入工程）、上端が閉鎖された筒状の排水ポンプ室１３を縦向きに構築し、排水ポンプ室１３内に水中ポンプ１４を設置する。   First, as shown in FIG. 4, a first stage soft soil 12 is introduced into the disposal site 10 until a predetermined thickness is reached (soft soil introduction step), and a cylindrical drainage pump chamber 13 whose upper end is closed. Is constructed vertically and a submersible pump 14 is installed in the drainage pump chamber 13.

また、水中ポンプ１４には、排水管１５が接続されており、水中ポンプ１４を稼働することにより、排水ポンプ室１３内の水を外部に排水できるようにしている。   Further, a drain pipe 15 is connected to the submersible pump 14, and the water in the drain pump chamber 13 can be drained to the outside by operating the submersible pump 14.

さらに、この排水ポンプ室１３には、排水ポンプ室１３と平行配置に上端が閉鎖された縦向きの集水管６ａを設置し、排水ポンプ室１３の下端部と集水管６ａの下端部とを互いに連通させる。   Further, the drainage pump chamber 13 is provided with a vertical water collecting pipe 6a whose upper end is closed in parallel with the drainage pump chamber 13, and the lower end of the drainage pump chamber 13 and the lower end of the water collecting pipe 6a are connected to each other. Communicate.

また、排水ポンプ室１３の上端部分には、接続管１６ａを介して真空ポンプ１６を接続する。   A vacuum pump 16 is connected to the upper end portion of the drainage pump chamber 13 via a connecting pipe 16a.

次に、図５に示すように、投入した第１段目の軟弱土１２上に複合ドレーン体１を敷設する。   Next, as shown in FIG. 5, the composite drain body 1 is laid on the first-stage soft soil 12 that has been introduced.

複合ドレーン体１を敷設するには、図５（ａ）に示すように、施工現場に搬入した巻き体１Ａを、ロール中心軸を水平ドレーン材２，２...敷設方向に対して直角に向けて処分場１０の縁部に設置し、その一端に対岸のウインチ２１より繰り出した牽引ロープ２２を連結する。   In order to lay the composite drain body 1, as shown in FIG. 5 (a), the roll body 1A carried into the construction site is set so that the roll center axis is perpendicular to the horizontal drain material 2, 2 ... laying direction. It is installed at the edge of the disposal site 10 and a tow rope 22 fed from a winch 21 on the opposite bank is connected to one end thereof.

次に、図５（ｂ）に示すように、ウインチ２１で牽引ロープ２２を巻取り、複合ドレーン体１を水上に引き出して展張する（複合ドレーン展張工程）。その際、複合ドレーン体１は、軽量であるので水上に浮かんだ状態となる。尚、複合ドレーン体１は、作業船によってえい航することによって引き出してもよい。   Next, as shown in FIG.5 (b), the tow rope 22 is wound up with the winch 21, and the composite drain body 1 is pulled out on water and extended (composite drain extension process). At that time, since the composite drain body 1 is lightweight, it is in a state of floating on the water. The composite drain body 1 may be pulled out by towing with a work ship.

そして、図５（ｃ）に示すように、この複合ドレーン展張工程を幅方向及び長手方向で繰り返し、複数の複合ドレーン体１を互いに側縁を重ねた状態で水上に並べて配置し、各複合ドレーン体１の側縁を互いに結束具２４によって連結する。   Then, as shown in FIG. 5 (c), this composite drain extension step is repeated in the width direction and the longitudinal direction, and a plurality of composite drain bodies 1 are arranged side by side on the water with their side edges overlapped, and each composite drain is arranged. The side edges of the body 1 are connected to each other by a binding tool 24.

そして、所定の配置が完了したら各水平ドレーン材２，２...の端部をキャップ５を介して水平方向に向けた集水管６ｂに接続し、図６、図７に示すように、各複合ドレーン体１の上面に錘２３，２３を載荷させ、沈下させる（複合ドレーン体敷設工程）。   When the predetermined arrangement is completed, the ends of the horizontal drain members 2, 2... Are connected to the water collecting pipes 6b oriented in the horizontal direction via the caps 5, and as shown in FIGS. The weights 23 and 23 are loaded on the upper surface of the composite drain body 1 and are allowed to sink (composite drain body laying step).

その際、各水平ドレーン材２，２...は、展張用剛性部材３に保持された状態にあるので、隣り合う各水平ドレーン材２，２...の間隔が一定に保たれた状態で敷設することができる。   At that time, since the horizontal drain members 2, 2... Are held by the expansion rigid member 3, the interval between the adjacent horizontal drain members 2, 2... Is kept constant. Can be laid.

そして、集水管６ｂの一端を、縦向きの集水管６ａを介して排水ポンプ室１３に接続し、集水管６ｂと排水ポンプ室１３内とを連通させる。   Then, one end of the water collecting pipe 6b is connected to the drainage pump chamber 13 via the vertical water collecting pipe 6a, and the water collecting pipe 6b and the inside of the drainage pump chamber 13 are communicated with each other.

次に、敷設された複合ドレーン体１の上に第２段目の軟弱土１２を投入する（軟弱土投入工程）。   Next, the second-stage soft soil 12 is charged onto the laid composite drain body 1 (soft soil charging step).

そして、軟弱土投入工程と複合ドレーン体展張工程及び複合ドレーン体敷設工程を下側より順次繰り返すことにより、図８に示すように、処分場１０内に投入された軟弱土１２中に水平ドレーン材２，２...が水平及び垂直方向に互いに間隔をおいて埋設される。   Then, by sequentially repeating the soft soil charging process, the composite drain body extending process, and the composite drain body laying process from the lower side, as shown in FIG. 8, the horizontal drain material is placed in the soft soil 12 that is input into the disposal site 10. 2, 2... Are embedded in the horizontal and vertical directions at intervals.

次に、排水ポンプ室１３内の水中ポンプ１４を稼働させ、排水ポンプ室１３内より排水し、排水ポンプ室１３内の水位を低下させ、排水ポンプ室１３内外の水頭差を利用して各水平ドレーン材２，２...内を減圧させるとともに、地上に設置した真空ポンプ１６を稼働させ、各水平ドレーン材２，２...内を減圧し、軟弱地盤の圧密作業を開始する。   Next, the submersible pump 14 in the drainage pump chamber 13 is operated to drain from the drainage pump chamber 13, the water level in the drainage pump chamber 13 is lowered, and each horizontal level is utilized by utilizing the water head difference inside and outside the drainage pump chamber 13. The inside of the drain materials 2, 2 ... is depressurized, and the vacuum pump 16 installed on the ground is operated to depressurize the inside of each horizontal drain material 2, 2, ..., and the consolidation work of the soft ground is started.

その際、各水平ドレーン材２，２...が一定の間隔を維持した状態で埋設されているので、軟弱地盤に対し均一に負圧を作用させることができる。   At that time, since the horizontal drain materials 2, 2... Are embedded in a state where a constant interval is maintained, a negative pressure can be applied uniformly to the soft ground.

また、その負圧の効果範囲は、図９（ａ）に示すように、各水平ドレーン材２，２...間に渡って補助ドレーン部材４が配置され、透水性を有する紐材を通して水が移動できるので、図９（ｂ）に示す水平ドレーン材２，２...のみの場合に比べ、軟弱地盤中の水を効率よく排水し、圧密を促進することができる。   Further, as shown in FIG. 9A, the effective range of the negative pressure is such that the auxiliary drain member 4 is disposed between the horizontal drain members 2, 2... Therefore, as compared with the case of only the horizontal drain materials 2, 2... Shown in FIG. 9B, water in the soft ground can be drained efficiently and consolidation can be promoted.

図１０は、軟弱土１２の圧密係数ｃｖが１００ｃｍ２／ｄａｙの場合において，水平ドレーン材２，２...の間隔と平均圧密度が８０％と９０％になる時間ｔ８０とｔ９０との関係を示している。図１０に示されるように、本願発明では、水平ドレーン材２，２...のみの場合に比べ、圧密時間を大幅に短縮することができる。   FIG. 10 shows the relationship between the interval between the horizontal drain members 2, 2... And the times t80 and t90 when the average density is 80% and 90% when the consolidation coefficient cv of the soft soil 12 is 100 cm 2 / day. Show. As shown in FIG. 10, in the present invention, the consolidation time can be greatly shortened compared to the case of only the horizontal drain materials 2, 2.

尚、上述の実施例では、展張用剛性部材３を網状に形成した例について説明したが、展張用剛性部材３は、樹脂製の横材を水平ドレーン材２，２...間に架け渡したものであってもよい。   In the above-described embodiment, the example in which the stretch rigid member 3 is formed in a net shape has been described. However, the stretch rigid member 3 spans a resin cross member between the horizontal drain members 2, 2. It may be what you did.

また、上述の実施例では、排水ポンプ室１３内外の水頭差を利用して各水平ドレーン材２，２...内を減圧させる方法と、地上に設置した真空ポンプによって各水平ドレーン材２，２...に負圧を作用させる方法とを併用した例について説明したが、何れか一方の方法で各水平ドレーン材２，２...内を減圧させるようにしてもよい。   In the above-described embodiment, the horizontal drain members 2, 2... Are decompressed by utilizing the water head difference inside and outside the drainage pump chamber 13, and the horizontal drain members 2, 2 by a vacuum pump installed on the ground. The example in which the method of applying a negative pressure to 2 ... has been described, but the inside of each horizontal drain material 2, 2 ... may be depressurized by any one method.

１ 複合ドレーン体
２ 水平ドレーン材
３ 展張用剛性部材
４ 補助ドレーン部材
５ キャップ
６ａ，６ｂ 集水管
１０ 処分場
１１ 護岸
１２ 軟弱土
１３ 排水ポンプ室
１４ 水中ポンプ
１５ 排水管
１６ 真空ポンプ
２１ ウインチ
２２ 牽引ワイヤ DESCRIPTION OF SYMBOLS 1 Composite drain body 2 Horizontal drain material 3 Expanding rigid member 4 Auxiliary drain member 5 Cap 6a, 6b Catch pipe 10 Disposal site 11 Revetment 12 Soft soil 13 Drain pump room 14 Submersible pump 15 Drain pipe 16 Vacuum pump 21 Winch 22 Tow wire

Claims (7)

軟弱地盤中に互いに間隔をおいて水平に埋設される複数の水平ドレーン材を備えた複合ドレーン体であって、
隣り合う水平ドレーン材間に渡って配置され、各水平ドレーン材間を一定間隔に保持する展張用剛性部材と、隣り合う前記水平ドレーン材間に渡って配置される透水性を有する補助ドレーン部材とを備え、前記水平ドレーン材、前記補助ドレーン部材及び前記展張用剛性部材が一体的に積層されていることを特徴とする複合ドレーン体。 A composite drain body comprising a plurality of horizontal drain materials embedded horizontally in a soft ground at intervals,
A spreading rigid member that is arranged between adjacent horizontal drain materials and holds the horizontal drain materials at a fixed interval, and an auxiliary drain member having water permeability that is arranged between the adjacent horizontal drain materials. And a horizontal drain material, the auxiliary drain member, and the expansion rigid member are integrally laminated. 前記展張用剛性部材は、樹脂材によって網状又は格子状に形成されている請求項１に記載の複合ドレーン体。   The composite drain body according to claim 1, wherein the expansion rigid member is formed of a resin material in a net shape or a lattice shape. 前記補助ドレーン部材は、多数の繊維体を撚った紐材からなる請求項１又は２に記載の複合ドレーン体。   The composite drain body according to claim 1 or 2, wherein the auxiliary drain member is made of a string material obtained by twisting a large number of fiber bodies. 前記補助ドレーン部材は、透水性素材をもってシート状に形成されている請求項１又は２に記載の複合ドレーン体。   The composite drain body according to claim 1 or 2, wherein the auxiliary drain member is formed into a sheet shape with a water-permeable material. 軟弱土を投入する工程と、所定の厚みまで軟弱土を投入する毎に投入した軟弱土上に複数の水平ドレーン材を並べて敷設する工程とを繰り返し、軟弱地盤中に複数の水平ドレーン材を埋設し、前記水平ドレーン材より吸水するようにした水平ドレーン圧密工法において、
互いに間隔を置いて並べられた複数の水平ドレーン材と、隣り合う水平ドレーン材間に渡って配置され、該各水平ドレーン材間を一定に保持する展張用剛性体と、隣り合う前記水平ドレーン材間に渡って配置される透水性を有する補助ドレーン部材とが一体的に積層されてなる複合ドレーン体を使用し、
投入した軟弱土が一定厚みに達する毎に前記前記複合ドレーン体を展開し、展開した前記複合ドレーン体を投入された軟弱土上に敷設し、しかる後、敷設された前記複合ドレーン体上に軟弱土を投入することを特徴とする水平ドレーン圧密工法。 Repeat the process of throwing soft soil and the process of laying multiple horizontal drain materials side by side on the soft soil thrown every time soft soil is thrown to a predetermined thickness, and burying multiple horizontal drain materials in the soft ground In the horizontal drain compaction method that absorbs water from the horizontal drain material,
A plurality of horizontal drain materials arranged at an interval from each other, a stretching rigid body that is disposed between adjacent horizontal drain materials and holds the horizontal drain materials constant, and the adjacent horizontal drain materials. Use a composite drainage body in which auxiliary drainage members having water permeability arranged therebetween are integrally laminated,
Each time the charged soft soil reaches a certain thickness, the composite drainage body is expanded, and the expanded composite drainage body is laid on the input soft soil, and then the soft drainage is softly laid on the laid composite drainage body. Horizontal drain consolidation method characterized by throwing in soil. 前記複合ドレーン体を巻き体としておき、投入した軟弱土が一定厚みに達する毎に前記巻き体を水上で展開する請求項５に記載の水平ドレーン圧密工法。   The horizontal drain consolidation method according to claim 5, wherein the composite drainage body is used as a winding body, and the winding body is developed on the water every time the input soft soil reaches a certain thickness. 縦向き筒状の排水ポンプ室を水中に設置しておき、沈下させた前記複合ドレーン体の各水平ドレーン材を前記排水ポンプ室に連通させておき、しかる後、前記排水ポンプ室内より排水することにより室内の水位を低下させ、該排水ポンプ室内外の水頭差によって前記各水平ドレーン材内を減圧させる請求項５又は６に記載の水平ドレーン圧密工法。   A vertical cylindrical drainage pump chamber is installed in the water, and each horizontal drain material of the composite drainage body that has been sunk is communicated with the drainage pump chamber, and then drained from the drainage pump chamber. The horizontal drain consolidation method according to claim 5 or 6, wherein a water level in the room is lowered by the pressure and the inside of each horizontal drain material is depressurized by a water head difference between the inside and outside of the drainage pump.
JP2016224710A 2016-11-18 2016-11-18 Composite drain body and horizontal drain consolidation method using it Active JP6886575B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2016224710A JP6886575B2 (en) 2016-11-18 2016-11-18 Composite drain body and horizontal drain consolidation method using it

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2016224710A JP6886575B2 (en) 2016-11-18 2016-11-18 Composite drain body and horizontal drain consolidation method using it

Publications (2)

Publication Number Publication Date
JP2018080541A true JP2018080541A (en) 2018-05-24
JP6886575B2 JP6886575B2 (en) 2021-06-16

Family

ID=62197586

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2016224710A Active JP6886575B2 (en) 2016-11-18 2016-11-18 Composite drain body and horizontal drain consolidation method using it

Country Status (1)

Country Link
JP (1) JP6886575B2 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2020142670A (en) * 2019-03-07 2020-09-10 五洋建設株式会社 Drainage device and drainage method for barge
JP2021080658A (en) * 2019-11-15 2021-05-27 株式会社大林組 Soil drainage device
JP7407639B2 (en) 2020-03-27 2024-01-04 東亜建設工業株式会社 How to lay horizontal drain material

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05230823A (en) * 1992-02-18 1993-09-07 Penta Ocean Constr Co Ltd Horizontal drain material laying method for improving extremely poor subsoil
JPH0813466A (en) * 1994-06-29 1996-01-16 Daito Kogyo Kk Installation device for horizontal drain material in water bottom and installation method
US5688073A (en) * 1993-06-11 1997-11-18 Brodeur; Joseph Clement Earth drains
JPH10140550A (en) * 1996-11-08 1998-05-26 Amano:Kk Horizontal drain and joint body therefor

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05230823A (en) * 1992-02-18 1993-09-07 Penta Ocean Constr Co Ltd Horizontal drain material laying method for improving extremely poor subsoil
US5688073A (en) * 1993-06-11 1997-11-18 Brodeur; Joseph Clement Earth drains
JPH0813466A (en) * 1994-06-29 1996-01-16 Daito Kogyo Kk Installation device for horizontal drain material in water bottom and installation method
JPH10140550A (en) * 1996-11-08 1998-05-26 Amano:Kk Horizontal drain and joint body therefor

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2020142670A (en) * 2019-03-07 2020-09-10 五洋建設株式会社 Drainage device and drainage method for barge
JP2021080658A (en) * 2019-11-15 2021-05-27 株式会社大林組 Soil drainage device
JP7407639B2 (en) 2020-03-27 2024-01-04 東亜建設工業株式会社 How to lay horizontal drain material

Also Published As

Publication number Publication date
JP6886575B2 (en) 2021-06-16

Similar Documents

Publication Publication Date Title
JP2018080541A (en) Composite drain body and horizontal drain consolidation method using the same
JP6680461B2 (en) Slope protection tool and slope protection method
CN104775415B (en) Blow and fill out workplatform and the constructional method that super soft ground is reinforced fast
JP2009209571A (en) Water guide material, and water guide material setting method
JP2023164694A (en) Construction method of ground for liquefaction countermeasure
KR100995800B1 (en) The method constructing a bamboo mat easily on the soft clay surface
US10634427B2 (en) Drainage system and method of drying frac sand
CN101260666A (en) Composite water drainage air-exhausting electrode tube
JP6803783B2 (en) Field conversion method and irrigation drainage system
JP2003055951A (en) Improving method and improving device for soft ground
JP3777566B2 (en) Soft ground improvement method by vacuum consolidation
JP6858484B2 (en) Waterproof sheet and waterproof structure of tunnel
JP2884025B2 (en) Horizontal drain material laying method for super soft ground improvement
JP6249560B2 (en) Ground improvement method and drain material
KR200437256Y1 (en) The natural fiber drain member for removing water out of the damp ground
JP2008163720A (en) Draining material used for improvement method of soft ground such as landfill
JP2021046780A (en) Water curable civil engineering sheet and method for constructing the same
CN2575158Y (en) Double-spacing hinging apparatus for articulated loading machine
KR101326067B1 (en) drain board
CN203475454U (en) Water drainage core board
JPH0516492B2 (en)
JP6886205B2 (en) Slope protection equipment and slope protection method
JP5510866B2 (en) Laying of horizontal drain material for soft ground improvement
CN102787613B (en) Underground cavern drainage blind ditch device
RU2400596C1 (en) Combined drainage of biopositive design

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20191101

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20200904

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20200916

A521 Request for written amendment filed

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20201021

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20210310

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20210402

R150 Certificate of patent or registration of utility model

Ref document number: 6886575

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R150