JP2005021757A

JP2005021757A - Bottom mud treatment method

Info

Publication number: JP2005021757A
Application number: JP2003187755A
Authority: JP
Inventors: Mineo Kobayashi; 小林峯男; Satoshi Hashimoto; 橋本聡
Original assignee: Taisei Corp
Current assignee: Taisei Corp
Priority date: 2003-06-30
Filing date: 2003-06-30
Publication date: 2005-01-27
Anticipated expiration: 2023-06-30
Also published as: JP4274314B2

Abstract

PROBLEM TO BE SOLVED: To provide a bottom mud treatment method by which bottom mud deposited on a water bottom can efficiently and securely be treated. SOLUTION: A stirring device 1 consists of a plurality of drive apparatuses 2 disposed at prescribed intervals in an almost horizontal direction or an almost vertical direction and a stirring body 3 provided between the drive apparatuses 2, and is set in a hull 4. The stirring body 3 is driven by the plurality of drive apparatuses 2 to stir and mix bottom mud 6 and earth and sand 7, so that the bottom mud is continuously treated in accordance with the movement of the hull 4. COPYRIGHT: (C)2005,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は、水底に堆積した底泥を改良する底泥処理工法に関するものである。
【０００２】
【従来の技術】
河川や湖沼などの水底に堆積した有機汚泥から溶出するリンや窒素などによって水底環境が悪化し、水底生物の減少などをはじめとする環境問題が生じている。かかる環境問題に対する対処方法として、従来、底泥を浚渫して場外へ搬出する工法や水上の船体から良質の土砂を散布して底泥上を被覆する工法などが実施されている。
【０００３】
特許文献１においては、良質の砂を水底の底泥上に被覆した後、耕耘装置にて砂と底泥を耕耘して混合する底泥の処理工法が開示されている。
また、特許文献２においては、台船からロープｃによって吊下げたオーガーａを使用して、底泥ｄとその下に位置する土砂ｅをオーガーａによって掘削するとともに高圧エアーｂによって混合撹拌することによって混合土砂ｆを造成して底泥ｄを処理する工法が開示されている（図６参照）。
【０００４】
【特許文献１】
特開昭６３−１０７６１１号公報
【特許文献２】
特開２００２−３０６００１号公報
【０００５】
【発明が解決しようとする課題】
前記した従来の底泥処理工法にあっては、次のような問題点がある。
＜イ＞底泥を浚渫して場外へ搬出する工法では、搬出した底泥の処理に要する費用の問題と、処理土の処分地の確保が問題となる。
＜ロ＞砂などの土砂にて底泥上を被覆する工法や土砂を底泥上に散布した後に土砂と底泥を混合撹拌する工法では、土砂購入費用の問題や散布した土砂による水底レベルの上昇によって水深が浅くなるといった問題が生じる。
＜ハ＞底泥とその下の土砂を台船から吊下げたオーガーにて掘削するとともに高圧エアーにて混合撹拌する工法では、撹拌時のオーガーがぶれるなどの不安定化の問題と、オーガー駆動部がオーガーの一端のみの構成であるため混合撹拌の効率性及び確実性に問題が生じ易い。
＜ニ＞底泥とその下の土砂を台船から吊下げたオーガーにて掘削するとともに高圧エアーにて混合撹拌する工法では、オーガーを底泥及び土砂内に貫入させた状態でオーガーを横方向に並行移動し難いため、オーガーの移動ごとにオーガーを引抜いておこなう必要があり、作業効率の低下につながる。
【０００６】
【発明の目的】
本発明は上記したような従来の問題を解決するためになされたもので、処分土の発生の問題が生じない底泥処理工法を提供することを目的とする。また、土砂購入の問題及び水深が浅くなるといった問題が生じない底泥処理工法を提供することを目的とする。また、施工時の撹拌体の安定化を図り底泥とその下の土砂の混合撹拌を効率的かつ確実におこなうことのできる底泥処理工法を提供することを目的とする。さらに、底泥及び土砂内に撹拌体を貫入させた状態で撹拌体の横移動をおこなうことのできる底泥処理工法を提供することを目的とする。
本発明は、これらの目的の少なくとも一つを達成するものである。
【０００７】
【課題を解決するための手段】
上記のような目的を達成するために、本発明の底泥処理工法は、水底に堆積した底泥と底泥下の土砂とに跨った位置に撹拌装置を挿入し、前記底泥と前記土砂とを前記撹拌装置にて混合撹拌しながら撹拌装置を移動させて前記底泥を改良する底泥処理工法であって、前記撹拌装置は、略水平方向又は略鉛直方向に所定間隔を置いて複数設けた駆動装置と該駆動装置の間に設けた撹拌体とからなり、複数の前記駆動装置にて前記撹拌体を駆動させることにより前記底泥と前記土砂とを混合撹拌することを特徴とする底泥処理工法である。
【０００８】
また、本発明の底泥処理工法は、水底に堆積した底泥と底泥下の土砂とに跨った位置に撹拌装置を挿入し、前記底泥と前記土砂とを前記撹拌装置にて混合撹拌しながら撹拌装置を移動させて前記底泥を改良する底泥処理工法であって、前記撹拌装置は、鉛直方向に所定間隔を置いて設けた枢軸回りを回転する複数の歯車と該歯車を回転させる複数の駆動装置と複数の該歯車間を歯車の回転によって回る鎖体とを備えてなり、複数の前記駆動装置によって複数の前記歯車を回転させ、前記鎖体を回すことによって前記底泥と前記土砂とを混合撹拌することを特徴とする底泥処理工法を使用できる。
【０００９】
また、本発明の底泥処理工法は、水底に堆積した底泥と底泥下の土砂とに跨った位置に撹拌装置を挿入し、前記底泥と前記土砂とを前記撹拌装置にて混合撹拌しながら撹拌装置を移動させて前記底泥を改良する底泥処理工法であって、前記撹拌装置は、略水平方向に所定間隔を置いて複数設けた駆動装置の間に撹拌棒集合体を備えてなり、前記撹拌棒集合体は、水平軸回りに該水平軸に略垂直方向に放射状に延びた複数の撹拌棒体を前記水平軸の延伸方向に間隔を置いて複数備えてなり、複数の前記駆動装置によって前記撹拌棒集合体を前記水平軸回りに回転させて前記底泥と前記土砂とを混合撹拌することを特徴とする底泥処理工法を使用できる。
【００１０】
さらに、本発明の底泥処理工法は、水底に堆積した底泥と底泥下の土砂とに跨った位置に撹拌装置を挿入し、前記底泥と前記土砂とを前記撹拌装置にて混合撹拌しながら撹拌装置を移動させて前記底泥を改良する底泥処理工法であって、
前記撹拌装置は、略水平方向に所定間隔を置いて複数設けた駆動装置の間に撹拌筒体を備えてなり、前記撹拌筒体の側面に複数のスリットを備えた該撹拌筒体は該撹拌筒体の両端を前記駆動装置に取り付けてなり、複数の前記駆動装置によって前記撹拌筒体を回しながら前記底泥と前記土砂とを混合撹拌することを特徴とする底泥処理工法を使用できる。
【００１１】
【発明の実施の形態１】
以下、図面を参照しながら本発明の実施の形態１について説明する。
【００１２】
＜イ＞撹拌装置、駆動装置、撹拌体
本発明の撹拌装置１は、水底５に堆積した底泥６と底泥６下の土砂７とに跨った位置に挿入して、底泥６と土砂７とを混合撹拌するための装置である。
撹拌装置１は、略水平方向又は略鉛直方向に所定間隔を置いて複数設けた駆動装置２，２とかかる駆動装置２，２の間に設けた撹拌体３から構成される。かかる撹拌装置１は、船体４に設置した状態で底泥６と底泥６下の土砂７とに跨った位置に挿入させ、船体４の移動に伴って撹拌装置１は底泥６と土砂７を混合撹拌しながら横方向に移動して連続した施工を実現できる（図１参照）。
【００１３】
実施の形態１における撹拌装置１は、鉛直方向に所定間隔を置いて設けた枢軸３１，３１回りを回転する複数の歯車３２，３２と、かかる歯車３２，３２を回転させる複数の駆動装置２，２と、複数の歯車３２，３２の間を歯車３２，３２の回転によって回る鎖体３３とを備えて一ユニットを構成できる。すなわち、本実施の形態では撹拌体３として鎖体３３を使用するものである。ここで、鎖体３３としては公知のチェーンカッターを使用することができる。
図２に示すように、上記する撹拌装置１の一ユニットを複数組み合わせて撹拌装置１を構成することによって広範囲の混合撹拌を一度におこなうことが可能となり、撹拌効率を高めることができる。
撹拌装置１はその頭部を船体４に設けた開口部４４内を上下にスライド可能なスライドガイド４３，４３に吊治具体４５を介して取り付けることができる。かかる吊治具体４５は船体４のデッキ上の架台４１に備えた滑車４２に吊持した構成とする。
例えばＨ形鋼にて製作したスライドガイド４３，４３はジャッキ４６にて上下にスライド可能とし、かかるスライドガイド４３，４３のスライドによって撹拌装置の上下移動を調整することができる。
【００１４】
＜ロ＞施工方法
船体４を底泥処理施工位置の水面上に停止させ、スライドガイド４３，４３をスライドさせて撹拌装置１の下端近傍を所定深度まで降ろして固定する。ここで、所定深度とは底泥６と混合撹拌するのに適した量の土砂７を確保できる深度であり、底泥６の汚泥状況や土砂７の物性など、事前調査及び事前計画に基づいて決定される。
複数の駆動装置２を同時に駆動させて歯車３２、３２を回転させ、鎖体３３を回して底泥６と土砂７との混合撹拌をおこなう。所要の混合撹拌終了後、船体４を移動させて連続的に上記する底泥処理をおこない、所定範囲の施工をおこなっていく。
所定範囲の混合撹拌終了後、スライドガイド４３，４３をスライドさせて撹拌装置１を船体４内に収容する。
【００１５】
＜ハ＞作用
鉛直方向に所定間隔を置いて設けた歯車３２，３２は、夫々の歯車３２，３２を回転させる油圧モーターなどの駆動装置２，２を同一方向に回転駆動させることによって鎖体３３を歯車３２，３２の間を回すことができ、鎖体３３は上昇及び降下を繰り返すことにより底泥６と土砂７を撹拌することができる。
本実施の形態における撹拌体３は、上下に位置する駆動装置２，２間の距離を水底５までの深度や底泥６及び土砂７の撹拌層厚によって自在に調整することができる。したがって、水底５までの水深が深い場合や底泥６層厚が比較的厚い場合に使用するのが好ましく、例えば底泥６層厚が１ｍ以上の場合には本実施の形態の撹拌装置１を使用するのがよい。
ここで、駆動装置２を複数使用するため、高い撹拌性能を確保することができる。
さらに、船体４の移動に応じて撹拌装置１を横方向に移動させることで連続した混合撹拌を実現することができる。
また、鎖体３３として公知のチェーンカッターを使用する場合には撹拌装置１の製作に要するコストも安価となる。
【００１６】
【発明の実施の形態２】
以下、図面を参照しながら本発明の実施の形態２について説明する。
【００１７】
＜イ＞撹拌棒集合体、撹拌棒体
本実施の形態は、撹拌装置１として撹拌棒集合体３４を使用して底泥処理をおこなう工法である。撹拌棒集合体３４からなる撹拌装置１を船体４に備えて成形し、所定深度まで撹拌装置１の下端部を貫入させて底泥６と土砂７の混合撹拌をおこなうものである（図３参照）。
撹拌棒集合体３４は、水平軸３４１を筒体３４５に貫通設置し、筒体３４５の側面には水平軸３４１に略垂直方向に放射状に延びた複数の撹拌棒体３４２を設け、かかる複数の撹拌棒体３４２の集合体を筒体３４５（水平軸３４１）の延伸方向に間隔を置いて複数備えて構成するものである（図４（ａ）、（ｂ）参照）。放射状の撹拌棒体３４２は、その円周方向に交互に棒長を変えた（長短の撹拌棒体３４２を交互に構成）構成とすることもできるし（図４（ｂ）参照）、同一長さの撹拌棒体３４２によって構成することもできる。撹拌棒体３４２の水平軸３４１から離れた先端部には撹拌棒体３４２の延伸方向に直角又は所定の角度をもった凸部３４３を備えて形成するのがよい。撹拌効率を向上させるためである。
水平軸３４１の両端付近にはそれぞれ油圧モーターなどの駆動装置２，２を設け、かかる駆動装置２，２の間には撹拌棒集合体３４からなる撹拌装置１を設け、駆動装置２，２に撹拌装置１を連結する。かかる構成とすることにより、水平軸３４１回りを駆動装置２，２が回転するのに伴って撹拌装置１も水平軸３４１回りを回転することができる。
水平軸３４１は、船体４に設けた開口部４４内を上下にスライド可能なスライドガイド４３，４３に取り付けることができる。
【００１８】
＜ロ＞施工方法
船体４を底泥処理施工位置の水面上に停止させ、スライドガイド４３，４３をスライドさせて撹拌装置１の下端近傍を所定深度の土砂７まで貫入して固定する。かかる状態で、撹拌装置１は底泥６と土砂７に跨った位置に配置される。鉛直方向の撹拌範囲については、実施の形態１で示した撹拌装置１に比べて狭いものとなるが、撹拌棒体３４２の回転直径範囲とスライドガイド４３のスライド可能範囲から決定できる。
水平軸３４１両端の駆動装置２，２を同時に駆動させて撹拌棒集合体３４を水平軸３４１回りに回転させ、底泥６と土砂７との混合撹拌をおこなう。所要の混合撹拌終了後、船体４を移動させて連続的に上記する底泥処理をおこない、所定範囲の施工をおこなっていく。
所定範囲の混合撹拌終了後、スライドガイド４３，４３をスライドさせて撹拌装置１を船体４内に収容する。
【００１９】
＜ハ＞作用
撹拌装置１はその両端の駆動装置２によって回転するため、高い撹拌性能を確保でき、効率のよい混合撹拌を実現できる。
また、本実施の形態を使用する場合は、船体４のデッキ上に大型の架台等を設ける必要もなく、設備に要するコストは比較的低廉となる。
本実施の形態における撹拌装置１は比較的水底５が浅い場合や底泥６層厚の比較的薄い場合に使用するのが好ましく、例えば底泥６層厚が５０ｃｍ程度の場合に使用するのがよい。
【００２０】
【発明の実施の形態３】
以下、図面を参照しながら本発明の実施の形態３について説明する。なお、施工方法は実施の形態２と同様のため省略する。
【００２１】
＜イ＞撹拌筒体
本実施の形態は、撹拌装置１として撹拌筒体３５を使用して底泥処理をおこなう工法である。撹拌筒体３５からなる撹拌装置１を船体４に備えて底泥処理施工をおこなうことができるのは実施の形態２と同様である。
撹拌筒体３５はその側面３５１に複数のスリット３５２を備えた構成とする。撹拌筒体３５の両端部にはそれぞれ油圧モーターなどの駆動装置２，２を設け、かかる駆動装置２，２の中央貫通孔に水平軸３５３を貫通させて撹拌装置１を形成する（図５（ａ）、（ｂ）参照）。
水平軸３５３は、船体４に設けた開口部４４内を上下にスライド可能なスライドガイド４３，４３に取り付けることができる。
【００２２】
＜ロ＞作用
撹拌筒体３５を回転させて底泥６及び土砂７をスリット３５２から筒体内に取り込み、筒体内にて底泥６と土砂７を混合した後、スリット３５２及び撹拌筒体端部の開口３５４から混合した土砂を排出することができる。撹拌筒体３５内にて確実に底泥６と土砂７を混合撹拌できるため、確実に混合土砂を造成することができる。
本実施の形態における撹拌装置１は比較的水底５が浅い場合や底泥６層厚の比較的薄い場合に使用するのが好ましく、例えば底泥６層厚が１ｍ以下の場合に使用するのがよい。
【００２３】
【発明の効果】
本発明の底泥処理工法は以上説明したようになるから次のような効果を得ることができる。
＜イ＞底泥を浚渫処理しないため、底泥の処理費用と処理土の処分地の確保といった問題が生じない。
＜ロ＞砂などの土砂を使用しないため、土砂購入費用の問題は生じない。また、土砂によって底泥上を被覆しないため、水深が浅くなるといった問題は生じない。
＜ハ＞撹拌体はその両端に設けた駆動装置によって駆動させるため、底泥と土砂の混合撹拌を効率よく確実におこなうことができる。
＜ニ＞撹拌体を底泥及び土砂内に貫入させた状態で横方向に並行移動しながら混合撹拌をおこなうため、施工効率が向上する。
【図面の簡単な説明】
【図１】本発明の底泥処理工法の実施の形態１を示した側面図。
【図２】実施の形態１の撹拌装置の拡大図。
【図３】本発明の底泥処理工法の実施の形態２を示した側面図。
【図４】実施の形態２の撹拌装置の拡大図であり、（ａ）撹拌装置の正面図。（ｂ）撹拌装置のＡ−Ａ矢視図。
【図５】実施の形態３の撹拌装置の拡大図であり、（ａ）撹拌装置の正面図。（ｂ）撹拌装置のＢ−Ｂ矢視図。
【図６】従来の撹拌装置を示した断面図。
【符号の説明】
１・・・撹拌装置
２・・・駆動装置
３・・・撹拌体
３１・・枢軸
３２・・歯車
３３・・鎖体
３４・・撹拌棒集合体
３４１・水平軸
３４２・撹拌棒体
３５・・撹拌筒体
３５１・側面
３５２・スリット
３５３・両端
５・・・水底
６・・・底泥
７・・・土砂[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a bottom mud treatment method for improving bottom mud accumulated on a water bottom.
[0002]
[Prior art]
The bottom environment is deteriorated by phosphorus and nitrogen eluted from organic sludge deposited on the bottom of rivers and lakes, and environmental problems such as the decrease of bottom organisms are occurring. Conventionally, methods for coping with such environmental problems include a method for dripping bottom mud and carrying it out of the field, and a method for covering the bottom mud by spraying high-quality earth and sand from a water hull.
[0003]
Patent Document 1 discloses a bottom mud treatment method in which good quality sand is coated on the bottom mud of the water bottom, and then the sand and the bottom mud are cultivated and mixed by a tilling device.
Moreover, in patent document 2, using the auger a suspended from the trolley by the rope c, the bottom mud d and the earth and sand e located below are excavated by the auger a and mixed and stirred by the high-pressure air b. Discloses a method for forming the mixed earth and sand f to treat the bottom mud d (see FIG. 6).
[0004]
[Patent Document 1]
JP 63-107611 A [Patent Document 2]
JP 2002-306001 A
[Problems to be solved by the invention]
The conventional bottom mud treatment method has the following problems.
 In the construction method that removes the mud from the ground and transports it out of the site, there are problems with the cost of processing the removed mud and securing the disposal site for the treated soil.
 In the method of covering the bottom mud with earth and sand such as sand and the method of mixing and stirring the earth and sand after spraying the earth and sand on the bottom mud, there is a problem of earth and sand purchase costs and The problem arises that the water depth becomes shallow due to the rise.
<C> Excavation of bottom mud and soil below it with auger suspended from a carrier and mixing and stirring with high-pressure air will cause instability problems such as blurring of the auger during stirring and auger drive. Since the portion is composed of only one end of the auger, problems are likely to occur in the efficiency and certainty of mixing and stirring.
<D> Excavation of bottom mud and soil below it with auger suspended from a carrier and mixing and stirring with high-pressure air will cause the auger to run horizontally with the auger penetrated into the bottom mud and sediment. Since it is difficult to move in parallel, it is necessary to pull out the auger every time the auger moves, leading to a reduction in work efficiency.
[0006]
OBJECT OF THE INVENTION
The present invention has been made to solve the above-described conventional problems, and an object thereof is to provide a bottom mud treatment method that does not cause a problem of generation of disposal soil. It is another object of the present invention to provide a bottom mud treatment method that does not cause the problem of earth and sand purchase and the problem of shallow water depth. It is another object of the present invention to provide a bottom mud treatment method capable of stabilizing and stirring the stirrer during construction and mixing and stirring the bottom mud and the soil below it efficiently and reliably. It is another object of the present invention to provide a bottom mud treatment method capable of laterally moving the stirring body with the stirring body penetrating into the bottom mud and earth and sand.
The present invention achieves at least one of these objects.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the bottom mud treatment method of the present invention inserts a stirring device at a position straddling the bottom mud accumulated on the bottom of the water and the earth and sand below the bottom mud, and the bottom mud and the earth and sand. The bottom mud treatment method is to improve the bottom mud by moving the stirrer while mixing and stirring with the stirrer, and the stirrer includes a plurality of stirrers at a predetermined interval in a substantially horizontal direction or a substantially vertical direction. It comprises a driving device provided and a stirring body provided between the driving devices, and the bottom mud and the earth and sand are mixed and stirred by driving the stirring body by a plurality of the driving devices. It is a bottom mud treatment method.
[0008]
In the bottom mud treatment method of the present invention, a stirrer is inserted in a position straddling the bottom mud accumulated on the bottom of the water and the soil under the bottom mud, and the bottom mud and the earth and sand are mixed and stirred by the stirrer. The bottom mud treatment method is to improve the bottom mud by moving the agitator while the agitator rotates a plurality of gears rotating around a pivot provided at predetermined intervals in the vertical direction. A plurality of driving devices and a chain that rotates between the plurality of gears by rotating a gear, and a plurality of the gears are rotated by the plurality of driving devices, and the bottom mud is rotated by rotating the chain. A bottom mud treatment method characterized by mixing and stirring the earth and sand can be used.
[0009]
In the bottom mud treatment method of the present invention, a stirrer is inserted in a position straddling the bottom mud accumulated on the bottom of the water and the soil under the bottom mud, and the bottom mud and the earth and sand are mixed and stirred by the stirrer. A bottom mud treatment method for improving the bottom mud by moving a stirring device while the stirring device includes a stirring bar assembly between a plurality of drive devices provided at predetermined intervals in a substantially horizontal direction. The stirrer bar assembly comprises a plurality of stirrer bars extending radially about the horizontal axis in a direction substantially perpendicular to the horizontal axis and spaced apart in the extending direction of the horizontal axis. The bottom mud treatment method can be used in which the stirring rod aggregate is rotated about the horizontal axis by the driving device to mix and stir the bottom mud and the earth and sand.
[0010]
Further, in the bottom mud treatment method of the present invention, a stirrer is inserted in a position straddling the bottom mud accumulated on the bottom of the water and the soil under the bottom mud, and the bottom mud and the earth and sand are mixed and stirred by the stirrer. The bottom mud treatment method to improve the bottom mud by moving the stirring device while
The stirring device includes a stirring cylinder between a plurality of driving devices provided at a predetermined interval in a substantially horizontal direction, and the stirring cylinder including a plurality of slits on a side surface of the stirring cylinder A bottom mud treatment method can be used in which both ends of the cylinder are attached to the driving device, and the bottom mud and the earth and sand are mixed and stirred while the stirring cylinder is rotated by a plurality of the driving devices.
[0011]
DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1
Embodiment 1 of the present invention will be described below with reference to the drawings.
[0012]
<A> Stirrer, drive unit, stirrer The stirrer 1 of the present invention is inserted into a position straddling the bottom mud 6 deposited on the bottom 5 and the earth 7 below the bottom mud 6, and the bottom mud 6 and the earth and sand. 7 is a device for mixing and stirring.
The stirring device 1 includes a plurality of driving devices 2 and 2 provided at predetermined intervals in a substantially horizontal direction or a substantially vertical direction, and a stirring body 3 provided between the driving devices 2 and 2. The stirrer 1 is inserted in a position straddling the bottom mud 6 and the earth and sand 7 below the bottom mud 6 in a state where it is installed on the hull 4. It is possible to realize a continuous construction by moving in the horizontal direction while mixing and stirring (see FIG. 1).
[0013]
The stirring device 1 according to the first embodiment includes a plurality of gears 32 and 32 that rotate around pivots 31 and 31 provided at predetermined intervals in the vertical direction, and a plurality of drive devices 2 that rotate the gears 32 and 32. 2 and a chain 33 that rotates between the plurality of gears 32 and 32 by the rotation of the gears 32 and 32 can constitute one unit. That is, in this embodiment, the chain 33 is used as the stirring member 3. Here, as the chain 33, a known chain cutter can be used.
As shown in FIG. 2, a wide range of mixing and stirring can be performed at a time by combining a plurality of units of the stirring device 1 described above to constitute the stirring device 1, thereby improving the stirring efficiency.
The stirring device 1 can be attached to slide guides 43, 43 that can slide up and down in an opening 44 provided on the hull 4 with a head portion, via a hanging jig body 45. The suspension jig body 45 is configured to be suspended from a pulley 42 provided on a gantry 41 on a deck of the hull 4.
For example, slide guides 43, 43 made of H-shaped steel can be slid up and down by a jack 46, and the vertical movement of the stirring device can be adjusted by sliding the slide guides 43, 43.
[0014]
 Construction method The hull 4 is stopped on the water surface at the bottom mud treatment construction position, the slide guides 43 and 43 are slid, and the vicinity of the lower end of the agitator 1 is lowered to a predetermined depth and fixed. Here, the predetermined depth is a depth at which an amount of earth and sand 7 suitable for mixing and stirring with the bottom mud 6 can be secured. Based on the preliminary investigation and the prior plan, such as the sludge condition of the bottom mud 6 and the physical properties of the earth and sand 7 It is determined.
The plurality of driving devices 2 are simultaneously driven to rotate the gears 32 and 32 and the chain 33 is rotated to mix and stir the bottom mud 6 and the earth and sand 7. After completion of the required mixing and stirring, the hull 4 is moved to continuously perform the above-described bottom mud treatment, and a predetermined range of construction is performed.
After completion of the predetermined range of mixing and stirring, the slide guides 43 and 43 are slid to accommodate the stirring device 1 in the hull 4.
[0015]
<C> The gears 32, 32 provided at predetermined intervals in the vertical direction of operation are chain members 33 by driving the driving devices 2, 2 such as hydraulic motors for rotating the gears 32, 32 in the same direction. Can be rotated between the gears 32 and 32, and the chain 33 can stir the bottom mud 6 and the earth and sand 7 by repeating the rising and lowering.
The stirring body 3 in this Embodiment can adjust freely the distance between the drive devices 2 and 2 located up and down with the depth to the bottom 5 and the thickness of the bottom mud 6 and the earth and sand 7 stirring layer. Therefore, it is preferable to use when the water depth to the bottom 5 is deep or when the bottom mud 6 layer thickness is relatively thick. For example, when the bottom mud 6 layer thickness is 1 m or more, the stirring device 1 of this embodiment is used. It is good to use.
Here, since a plurality of drive devices 2 are used, high stirring performance can be ensured.
Furthermore, continuous mixing and stirring can be realized by moving the stirring device 1 in the lateral direction in accordance with the movement of the hull 4.
Moreover, when using a well-known chain cutter as the chain | strand body 33, the cost required for manufacture of the stirring apparatus 1 also becomes cheap.
[0016]
Second Embodiment of the Invention
The second embodiment of the present invention will be described below with reference to the drawings.
[0017]
<A> Stirring rod assembly, stirring rod body This embodiment is a method of performing bottom mud treatment using the stirring rod assembly 34 as the stirring device 1. A stirrer 1 comprising a stirrer assembly 34 is formed on the hull 4 and formed, and the lower end of the stirrer 1 is penetrated to a predetermined depth to mix and stir the bottom mud 6 and the earth and sand 7 (see FIG. 3). ).
The stirring bar assembly 34 has a horizontal shaft 341 penetrating through the cylindrical body 345, and a plurality of stirring bar bodies 342 extending radially in a direction substantially perpendicular to the horizontal shaft 341 are provided on the side surface of the cylindrical body 345. A plurality of aggregates of stirring rod bodies 342 are provided with a space in the extending direction of the cylindrical body 345 (horizontal shaft 341) (see FIGS. 4A and 4B). The radial stirrer 342 may have a configuration in which the bar lengths are alternately changed in the circumferential direction (long and short stirrer bars 342 are alternately configured) (see FIG. 4B) or the same length. It can also be constituted by the stirring rod body 342. It is preferable to form a protrusion 343 having a right angle or a predetermined angle with respect to the extending direction of the stirring rod 342 at the tip of the stirring rod 342 away from the horizontal axis 341. This is to improve the stirring efficiency.
Driving devices 2 and 2 such as hydraulic motors are provided near both ends of the horizontal shaft 341, and the stirring device 1 including the stirring rod assembly 34 is provided between the driving devices 2 and 2. The stirrer 1 is connected. With this configuration, the agitator 1 can also rotate about the horizontal axis 341 as the driving devices 2 and 2 rotate about the horizontal axis 341.
The horizontal shaft 341 can be attached to slide guides 43, 43 that can slide up and down in the opening 44 provided in the hull 4.
[0018]
 Construction method The hull 4 is stopped on the water surface at the bottom mud treatment construction position, the slide guides 43 and 43 are slid, and the lower end of the agitator 1 is penetrated to the earth and sand 7 at a predetermined depth and fixed. In such a state, the stirring device 1 is disposed at a position straddling the bottom mud 6 and the earth and sand 7. The stirring range in the vertical direction is narrower than that of the stirring device 1 shown in the first embodiment, but can be determined from the rotation diameter range of the stirring bar 342 and the slidable range of the slide guide 43.
The driving devices 2 and 2 at both ends of the horizontal shaft 341 are simultaneously driven to rotate the stirring bar assembly 34 around the horizontal shaft 341, and the mixed mud of the bottom mud 6 and the earth and sand 7 is performed. After completion of the required mixing and stirring, the hull 4 is moved to continuously perform the above-described bottom mud treatment, and a predetermined range of construction is performed.
After completion of the predetermined range of mixing and stirring, the slide guides 43 and 43 are slid to accommodate the stirring device 1 in the hull 4.
[0019]
<C> Since the action stirring device 1 is rotated by the drive devices 2 at both ends thereof, high stirring performance can be ensured and efficient mixing and stirring can be realized.
In addition, when this embodiment is used, it is not necessary to provide a large frame on the deck of the hull 4, and the cost required for the facilities is relatively low.
The stirring device 1 in the present embodiment is preferably used when the water bottom 5 is relatively shallow or when the bottom mud 6 layer thickness is relatively thin, for example, when the bottom mud 6 layer thickness is about 50 cm. Good.
[0020]
Embodiment 3 of the Invention
The third embodiment of the present invention will be described below with reference to the drawings. Note that the construction method is the same as that of the second embodiment, and is omitted.
[0021]
<A> Stirring cylinder This embodiment is a method of performing bottom mud treatment using the stirring cylinder 35 as the stirring device 1. As in the second embodiment, the hull 4 can be equipped with the stirring device 1 composed of the stirring cylinder 35 to perform the bottom mud treatment.
The stirring cylinder 35 is provided with a plurality of slits 352 on the side surface 351 thereof. Drive devices 2 and 2 such as hydraulic motors are provided at both ends of the stirring cylinder 35, respectively, and the horizontal shaft 353 is passed through the central through hole of the drive devices 2 and 2 to form the stirring device 1 (FIG. 5 ( a) and (b)).
The horizontal shaft 353 can be attached to slide guides 43, 43 that can slide up and down in the opening 44 provided in the hull 4.
[0022]
 Action After rotating the stirring cylinder 35 and taking the bottom mud 6 and earth and sand 7 into the cylinder from the slit 352 and mixing the bottom mud 6 and earth and sand 7 in the cylinder, the slit 352 and the end of the stirring cylinder The mixed earth and sand can be discharged from the opening 354. Since the bottom mud 6 and the earth and sand 7 can be reliably mixed and stirred in the stirring cylinder 35, the mixed earth and sand can be reliably created.
The stirring device 1 in the present embodiment is preferably used when the water bottom 5 is relatively shallow or when the bottom mud 6 layer thickness is relatively thin, for example, when the bottom mud 6 layer thickness is 1 m or less. Good.
[0023]
【The invention's effect】
Since the bottom mud treatment method of the present invention is as described above, the following effects can be obtained.
 Since the bottom mud is not subjected to dredging, there will be no problems such as the cost of treating the bottom mud and securing a disposal site for the treated soil.
 Since no earth and sand such as sand are used, there will be no problem of earth and sand purchase costs. Further, since the bottom mud is not covered with earth and sand, there is no problem that the water depth becomes shallow.
<C> Since the stirrer is driven by driving devices provided at both ends thereof, mixing and stirring of bottom mud and earth and sand can be performed efficiently and reliably.
<D> Since mixing agitation is performed while moving in parallel in the horizontal direction in a state where the agitation body is inserted into the bottom mud and earth and sand, construction efficiency is improved.
[Brief description of the drawings]
FIG. 1 is a side view showing Embodiment 1 of a bottom mud treatment method of the present invention.
FIG. 2 is an enlarged view of the stirring device according to the first embodiment.
FIG. 3 is a side view showing a second embodiment of the bottom mud treatment method of the present invention.
FIG. 4 is an enlarged view of the stirring device according to the second embodiment, and (a) a front view of the stirring device. (B) AA arrow directional view of a stirring apparatus.
FIG. 5 is an enlarged view of the stirring device according to the third embodiment, and (a) is a front view of the stirring device. (B) BB arrow line view of a stirring apparatus.
FIG. 6 is a cross-sectional view showing a conventional stirring device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Stirring apparatus 2 ... Drive apparatus 3 ... Stirring body 31 .. Pivot 32 .. Gear 33 .. Chain 34 .. Stirring bar assembly 341. Horizontal shaft 342. Stirring bar 35 .. Stirring cylinder 351, side surface 352, slit 353, both ends 5 ... water bottom 6 ... bottom mud 7 ... earth and sand

Claims

Insert a stirrer at a position straddling the bottom mud deposited on the bottom of the water and the soil below the bottom mud,
A bottom mud treatment method for improving the bottom mud by moving the stirring device while mixing and stirring the bottom mud and the earth and sand with the stirring device,
The stirring device comprises a plurality of driving devices provided at a predetermined interval in a substantially horizontal direction or a substantially vertical direction and a stirring body provided between the driving devices,
The bottom mud and the earth and sand are mixed and stirred by driving the stirring body with a plurality of the driving devices,
Bottom mud treatment method.

Insert a stirrer at a position straddling the bottom mud deposited on the bottom of the water and the soil below the bottom mud,
A bottom mud treatment method for improving the bottom mud by moving the stirring device while mixing and stirring the bottom mud and the earth and sand with the stirring device,
The stirring device includes a plurality of gears that rotate around a pivot provided at predetermined intervals in the vertical direction, a plurality of drive devices that rotate the gears, and a chain that rotates between the plurality of gears by rotation of the gears. And
A plurality of the gears are rotated by a plurality of the driving devices, and the bottom mud and the earth and sand are mixed and stirred by rotating the chain.
Bottom mud treatment method.

Insert a stirrer at a position straddling the bottom mud deposited on the bottom of the water and the soil below the bottom mud,
A bottom mud treatment method for improving the bottom mud by moving the stirring device while mixing and stirring the bottom mud and the earth and sand with the stirring device,
The stirring device comprises a stirring bar assembly between a plurality of drive devices provided at a predetermined interval in a substantially horizontal direction,
The stirrer bar assembly comprises a plurality of stirrer bars that extend radially about the horizontal axis in a direction substantially perpendicular to the horizontal axis and spaced in the extending direction of the horizontal axis,
The stirring rod aggregate is rotated around the horizontal axis by a plurality of the driving devices, and the bottom mud and the earth and sand are mixed and stirred,
Bottom mud treatment method.

Insert a stirrer at a position straddling the bottom mud deposited on the bottom of the water and the soil below the bottom mud,
A bottom mud treatment method for improving the bottom mud by moving the stirring device while mixing and stirring the bottom mud and the earth and sand with the stirring device,
The stirring device comprises a stirring cylinder between a plurality of drive devices provided at predetermined intervals in a substantially horizontal direction,
The stirring cylinder provided with a plurality of slits on the side surface of the stirring cylinder is formed by attaching both ends of the stirring cylinder to the driving device,
The bottom mud and the earth and sand are mixed and stirred while rotating the stirring cylinder by a plurality of the driving devices.
Bottom mud treatment method.