JP6814627B2 - Construction method of drainage channel, support structure of pipe with curved part in water - Google Patents

Construction method of drainage channel, support structure of pipe with curved part in water Download PDF

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JP6814627B2
JP6814627B2 JP2016249019A JP2016249019A JP6814627B2 JP 6814627 B2 JP6814627 B2 JP 6814627B2 JP 2016249019 A JP2016249019 A JP 2016249019A JP 2016249019 A JP2016249019 A JP 2016249019A JP 6814627 B2 JP6814627 B2 JP 6814627B2
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guide
curved
pipe
curved portion
water
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JP2018104893A (en
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信一 山崎
信一 山崎
雄二 新原
雄二 新原
稲垣 聡
聡 稲垣
健一郎 坂田
健一郎 坂田
和弘 飯田
和弘 飯田
伸幸 岩前
伸幸 岩前
広和 佐藤
広和 佐藤
健吾 関
健吾 関
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Kajima Corp
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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    • Y02E10/20Hydro energy

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  • Placing Or Removing Of Piles Or Sheet Piles, Or Accessories Thereof (AREA)

Description

本発明は、水中における放水路の施工方法等に関するものである。 The present invention relates to a method of constructing a drainage channel in water and the like.

発電所等からの放水を行うための水中の放水管としては、曲部付の管体と横坑とを接続する方法が提案されている(例えば特許文献1)。 As an underwater water discharge pipe for discharging water from a power plant or the like, a method of connecting a pipe body with a curved portion and a horizontal shaft has been proposed (for example, Patent Document 1).

特開2004−108078号公報Japanese Unexamined Patent Publication No. 2004-108078

しかしながら、曲部付管体と横坑とを接続するためには、曲部付管体を精度よく設置する必要がある。しかし、水中において、曲部付管体を精度よく設置する作業は容易ではない。 However, in order to connect the curved pipe body and the horizontal shaft, it is necessary to install the curved pipe body with high accuracy. However, it is not easy to install the curved tube with high accuracy in water.

本発明は、このような問題に鑑みてなされたもので、曲部付管体を精度よく設置して、容易に放水管を施工することが可能な放水路の施工方法等を提供することを目的とする。 The present invention has been made in view of such a problem, and provides a method for constructing a drainage channel, etc., in which a pipe body with a curved portion can be installed with high accuracy and a drainage pipe can be easily constructed. The purpose.

前述した目的を達成するために第1の発明は、水中において横坑と曲部付管体とが接合される放水路の施工方法であって、水中に鋼管矢板井筒を構築する工程と、前記鋼管矢板井筒の内部を掘削し、掘削基盤を施工する工程と、前記掘削基盤に所定数のガイド杭を打設する工程と、前記曲部付管体と、前記曲部付管体の受け台とが一体化された曲部付管体構造体を吊降ろし、前記曲部付管体構造体の下部に設けられた嵌合部を前記ガイド杭に嵌合させて、前記曲部付管体構造体を前記掘削基盤上に設置する工程と、前記曲部付管体の周囲に中詰材を充填する工程と、前記曲部付管体のバルクヘッド部と前記横坑とを接続する工程と、を具備し、前記ガイド杭は、少なくとも3本配置され、少なくとも1本の前記ガイド杭を前記バルクヘッド部側に配置し、他の前記ガイド杭を、前記バルクヘッド部から離れた位置に配置し、それぞれの前記ガイド杭の設置位置を位置決めするための水中導材が一体で構成され、前記水中導材が水中において、前記鋼管矢板井筒に固定され、前記水中導材と対応する位置の気中に、前記ガイド杭の設置位置を位置決めするための気中導材が配置され、前記ガイド杭は、前記気中導材および前記水中導材によって位置決めされた位置に打設されることを特徴とする放水路の施工方法である。 In order to achieve the above-mentioned object, the first invention is a method of constructing a drainage channel in which a horizontal shaft and a pipe body with a curved portion are joined in water, a step of constructing a steel pipe sheet pile in water, and the above-mentioned. A process of excavating the inside of a steel pipe sheet pile and constructing an excavation base, a process of placing a predetermined number of guide piles on the excavation base, a pipe with a curved portion, and a cradle for the pipe with a curved portion. The pipe structure with a curved portion is suspended, and the fitting portion provided at the lower part of the pipe structure with a curved portion is fitted to the guide pile to fit the pipe structure with a curved portion. A step of installing the structure on the excavation base, a step of filling the filling material around the curved pipe body, and a step of connecting the bulkhead portion of the curved pipe body and the horizontal shaft. And, at least three of the guide piles are arranged, at least one of the guide piles is arranged on the bulkhead portion side, and the other guide piles are placed at positions away from the bulkhead portion. An underwater guide material for arranging and positioning the installation position of each of the guide piles is integrally configured, and the underwater guide material is fixed to the steel pipe sheet pile pipe in water and at a position corresponding to the underwater guide material. in the gas, the gas in the guide member for positioning the installation position of the guide piles are arranged, the guide piles a Rukoto is Da設to the position positioned by the aerial guide member and the water guide member This is a characteristic drainage channel construction method.

第2の発明は、水中において横坑と曲部付管体とが接合される放水路の施工方法であって、水中に鋼管矢板井筒を構築する工程と、前記鋼管矢板井筒の内部を掘削し、掘削基盤を施工する工程と、前記掘削基盤に所定数のガイド杭を打設する工程と、前記曲部付管体と、前記曲部付管体の受け台とが一体化された曲部付管体構造体を吊降ろし、前記曲部付管体構造体の下部に設けられた嵌合部を前記ガイド杭に嵌合させて、前記曲部付管体構造体を前記掘削基盤上に設置する工程と、前記曲部付管体の周囲に中詰材を充填する工程と、前記曲部付管体のバルクヘッド部と前記横坑とを接続する工程と、を具備し、複数の前記ガイド杭を配置し、それぞれの前記ガイド杭の前記掘削基盤からの長さが異なり、複数の前記ガイド杭と前記嵌合部との嵌合がそれぞれ別々のタイミングで行われることを特徴とする放水路の施工方法である。
前記掘削基盤からの長さが長い前記ガイド杭が嵌合する前記嵌合部の径が、短い前記ガイド杭が嵌合する前記嵌合部の径より大きいことが望ましい。
The second invention is a method of constructing a drainage channel in which a horizontal shaft and a pipe with a curved portion are joined in water, in which a step of constructing a steel pipe sheet pile in water and excavating the inside of the steel pipe sheet pile. , The process of constructing the excavation base, the process of driving a predetermined number of guide piles on the excavation base, the curved portion in which the pipe body with the curved portion and the pedestal of the pipe body with the curved portion are integrated. The pipe structure with a curved portion is hung, the fitting portion provided at the lower part of the pipe structure with a curved portion is fitted to the guide pile, and the pipe structure with a curved portion is placed on the excavation base. A plurality of steps are included, including a step of installing, a step of filling a filling material around the curved tube, and a step of connecting the bulkhead portion of the curved tube and the side shaft . said guide piles arranged, each of said guide Ri said that Do different length from the drilling foundation piles, and characterized in that the fitting of a plurality of said guide piles and the fitting portion are respectively performed at different timings It is a construction method of the drainage channel.
It is desirable that the diameter of the fitting portion into which the guide pile having a long length from the excavation base is fitted is larger than the diameter of the fitting portion into which the short guide pile is fitted.

第3の発明は、水中において横坑と曲部付管体とが接合される放水路の施工方法であって、水中に鋼管矢板井筒を構築する工程と、前記鋼管矢板井筒の内部を掘削し、掘削基盤を施工する工程と、前記掘削基盤に所定数のガイド杭を打設する工程と、前記曲部付管体と、前記曲部付管体の受け台とが一体化された曲部付管体構造体を吊降ろし、前記曲部付管体構造体の下部に設けられた嵌合部を前記ガイド杭に嵌合させて、前記曲部付管体構造体を前記掘削基盤上に設置する工程と、前記曲部付管体の周囲に中詰材を充填する工程と、前記曲部付管体のバルクヘッド部と前記横坑とを接続する工程と、を具備し、前記中詰材は、水中不分離性セメントミルクであり、JIS R5201によるフロー値が320〜380mmで、単位体積重量が、掘削した地盤の単位体積重量以下であることを特徴とする放水路の施工方法である。 The third invention is a method of constructing a drainage channel in which a horizontal shaft and a pipe with a curved portion are joined in water, in which a step of constructing a steel pipe sheet pile in water and an excavation inside the steel pipe sheet pile. , The process of constructing the excavation base, the process of driving a predetermined number of guide piles on the excavation base, the curved portion in which the pipe body with the curved portion and the pedestal of the pipe body with the curved portion are integrated. The pipe structure with a curved portion is hung, the fitting portion provided at the lower part of the pipe structure with a curved portion is fitted to the guide pile, and the pipe structure with a curved portion is placed on the excavation base. It includes a step of installing, a step of filling a filling material around the curved pipe body, and a step of connecting the bulkhead portion of the curved pipe body and the horizontal shaft. The filling material is water-inseparable cement milk, and is a drainage channel construction method characterized in that the flow value according to JIS R5201 is 320 to 380 mm and the unit volume weight is equal to or less than the unit volume weight of the excavated ground. is there.

前記中詰材の水中不分離性セメントミルクの練り混ぜ水の一部に海水が用いられてもよい。 Seawater may be used as a part of the mixed water of the inseparable cement milk in water of the filling material.

前記曲部付管体構造体の上部には、複数の視準棒が接合され、前記視準棒の位置を陸上から計測することで、前記曲部付管体構造体の設置位置を確認してもよい。 A plurality of collimation rods are joined to the upper part of the curved pipe structure, and the installation position of the curved pipe structure is confirmed by measuring the position of the collimation rod from the land. You may.

第1から第3の発明によれば、まずガイド杭を打設し、ガイド杭に曲部付管体構造体の嵌合部を嵌合させることで、容易に曲部付管体を精度よく設置することができる。このため、曲部付管体と横坑とを精度よく接続することができる。 According to the first to third inventions, the guide pile is first driven, and the fitting portion of the curved pipe structure is fitted to the guide pile, so that the curved pipe can be easily and accurately obtained. Can be installed. Therefore, the pipe body with a curved portion and the horizontal shaft can be connected with high accuracy.

第1の発明では、3本以上のガイド杭を配置することで、より確実に精度よく曲部付管体を設置することができる。この際、一本のガイド杭がバルクヘッド部側に配置されるため、ヘッド部の位置精度を高くすることができる。 In the first invention, by arranging three or more guide piles, the pipe body with a curved portion can be installed more reliably and accurately. At this time, since one guide pile is arranged on the bulkhead portion side, the positioning accuracy of the head portion can be improved.

また、ガイド杭を設置する際に、水中導材および気中導材を用いることで、ガイド杭の位置精度を確保することができる。 Further, when the guide pile is installed, the position accuracy of the guide pile can be ensured by using the underwater guide material and the aerial guide material.

第2の発明では、それぞれのガイド杭の長さを変えることで、それぞれのガイド杭が同時に嵌合部に嵌合せず、順次嵌合させることができる。このため、ガイド杭を嵌合部に嵌合させることが容易である。 In the second invention, by changing the length of each guide stake, each guide stake can be sequentially fitted without being fitted to the fitting portion at the same time. Therefore, it is easy to fit the guide pile to the fitting portion.

第3の発明では、中詰材のフロー値を適切にすることで、曲部付管体の外周であって、鋼材からなる曲部付管体構造体の内部への中詰材の充填が容易である。また、中詰材の単位体積重量が、掘削した地盤の単位体積重量以下であることで、杭基礎が不要であり、直接基礎とすることができる。 In the third invention, by making the flow value of the filling material appropriate, the filling material can be filled into the inside of the curved pipe structure made of steel, which is the outer circumference of the curved pipe. It's easy. Further, since the unit volume weight of the filling material is equal to or less than the unit volume weight of the excavated ground , a pile foundation is not required and a direct foundation can be used.

また、セメントミルクの練り混ぜ水の一部に海水を用いることで、海上においてセメントミルクを練り混ぜる際に用いるための水槽を減らすことができる。また、海水を用いることで、プラント台船上でセメントミルクを容易に練り混ぜることができる。 Further, by using seawater as a part of the mixing water of cement milk, it is possible to reduce the number of water tanks to be used when kneading cement milk at sea. In addition, by using seawater, cement milk can be easily kneaded on the plant pontoon.

第1から第3の発明では、視準棒を測定して曲部付管体の位置を把握することで、曲部付管体の位置精度を確保することができる。 In the first to third inventions, the position accuracy of the curved tube can be ensured by measuring the collimation rod to grasp the position of the curved tube.

の発明は、水中における曲部付管体の支持構造であって、鋼管矢板井筒の内部の基盤に打設されたガイド杭と、前記ガイド杭の上部に配置された、曲部付管体と、前記曲部付管体の受け台とが一体化された曲部付管体構造体と、前記曲部付管体の外周に充填された中詰材と、を具備し、前記曲部付管体構造体は、前記曲部付管体構造体の下部に設けられた嵌合部と前記ガイド杭が嵌合しており、前記中詰材は、水中不分離性セメントミルクであり、JIS R5201によるフロー値が320〜380mmで、単位体積重量が、掘削した地盤の単位体積重量以下であることを特徴とする水中における曲部付管体の支持構造である。 The fourth invention is a support structure for a pipe body with a curved portion in water, in which a guide pile placed on the inner base of a steel pipe sheet pile pipe and a pipe with a curved portion arranged above the guide pile. The curved portion-attached pipe structure in which the body and the cradle of the curved portion-attached pipe body are integrated, and a filling material filled in the outer periphery of the curved portion-attached pipe body are provided. In the pipe structure with a part, the fitting portion provided in the lower part of the pipe structure with a curved part and the guide pile are fitted, and the filling material is water-inseparable cement milk. , JIS R5201 is a support structure for a pipe body with a curved portion in water, characterized in that the flow value is 320 to 380 mm and the unit volume weight is equal to or less than the unit volume weight of the excavated ground.

の発明によれば、精度よく曲部付管体の支持構造を得ることができる。 According to the fourth invention, it is possible to obtain a support structure of a tubular body with a curved portion with high accuracy.

本発明によれば、曲部付管体を精度よく設置して、容易に放水路を施工することが可能な放水管の施工方法等を提供することができる。 According to the present invention, it is possible to provide a method for constructing a water discharge pipe or the like, which can easily construct a water discharge channel by installing a pipe body with a curved portion with high accuracy.

放水路の施工方法を示す図。The figure which shows the construction method of a drainage channel. 放水路の施工方法を示す図。The figure which shows the construction method of a drainage channel. 放水路の施工方法を示す図。The figure which shows the construction method of a drainage channel. 水中導材17を示す平面図。The plan view which shows the underwater guide material 17. 放水路の施工方法を示す図。The figure which shows the construction method of a drainage channel. 放水路の施工方法を示す図。The figure which shows the construction method of a drainage channel. 放水路の施工方法を示す図。The figure which shows the construction method of a drainage channel. 放水路の施工方法を示す図。The figure which shows the construction method of a drainage channel. 放水路の施工方法を示す図。The figure which shows the construction method of a drainage channel. レグ3の下端近傍の概念図。Conceptual diagram near the lower end of leg 3. 放水路50を示す図。The figure which shows the drainage channel 50.

以下、図面に基づいて、本発明の実施の形態を詳細に説明する。図1は、放水路の施工方法を示す図である。まずは、自己昇降式作業台船1を施工場所まで曳船等で曳航する。なお、自走式の自己昇降式作業台船1であってもよい。自己昇降式作業台船1は、図示を省略するジャッキを用いて、レグ3に沿って架台5を昇降させることができる。したがって、レグ3を海底11に固定して、架台5を海上に設置することができる。 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a diagram showing a construction method of a drainage channel. First, the self-elevating workbench 1 is towed to the construction site by a tugboat or the like. The self-propelled self-propelled workbench 1 may be used. The self-elevating workbench 1 can elevate the gantry 5 along the leg 3 by using a jack (not shown). Therefore, the leg 3 can be fixed to the seabed 11 and the gantry 5 can be installed on the sea.

架台5上には、クレーン7が設置される。クレーン7を用いて鋼管矢板9を打設することができる。鋼管矢板9は、例えば、クレーン7で水中バイブロハンマを吊下げ、水中バイブロハンマによって、海底11の矢板設置予定位置に打ち込まれる。複数の鋼管矢板9を例えば円形に配置することで、水中に鋼管矢板井筒を構築する。 A crane 7 is installed on the gantry 5. The steel pipe sheet pile 9 can be driven by using the crane 7. For example, the steel pipe sheet pile 9 is suspended from an underwater vibro hammer by a crane 7, and is driven into a planned sheet pile installation position on the seabed 11 by the underwater vibro hammer. By arranging a plurality of steel pipe sheet piles 9 in a circular shape, for example, a steel pipe sheet pile well is constructed in water.

次に、図2に示すように、鋼管矢板井筒9aの内部を掘削し、掘削基盤13を施工する。この際、まず、鋼管矢板井筒9aの内部を、腹起し15の下端レベルまで掘削し、必要に応じて鋼管矢板井筒9aの内部に腹起し15を設置する。腹起し15を設置した後、掘削基盤13まで地盤を掘削する。なお、以下の図においては、腹起し15については図示を省略する。 Next, as shown in FIG. 2, the inside of the steel pipe sheet pile well tube 9a is excavated and the excavation base 13 is constructed. At this time, first, the inside of the steel pipe sheet pile 9a is excavated to the lower end level of the abdomen 15 and, if necessary, the abdomen 15 is installed inside the steel pipe sheet pile 9a. After installing the abdomen 15, the ground is excavated up to the excavation base 13. In the following figures, the abdominal upset 15 is not shown.

次に、図3に示すように、鋼管矢板井筒9aの下部近傍であって、掘削基盤13の上方に、水中導材17を設置する。図4は、水中導材17を示す平面図である。水中導材17は、設置するガイド杭の本数に対応した数のガイド部17aを有する。図示した例では、ガイド部17aが三カ所配置される。ガイド部17aは、略等間隔に鋼管矢板井筒9aの内面近傍に配置される。 Next, as shown in FIG. 3, the underwater guide material 17 is installed near the lower part of the steel pipe sheet pile 9a and above the excavation base 13. FIG. 4 is a plan view showing the underwater guide material 17. The underwater guide material 17 has a number of guide portions 17a corresponding to the number of guide piles to be installed. In the illustrated example, the guide portions 17a are arranged at three locations. The guide portions 17a are arranged near the inner surface of the steel pipe sheet pile 9a at substantially equal intervals.

ガイド部17a同士は互いに連結されており、水中で、鋼管矢板井筒9aの内面に溶接等で固定される。なお、水中導材17は、あらかじめ一体化されており、ガイド部17aの同士の連結は、陸上で行われる。 The guide portions 17a are connected to each other and are fixed to the inner surface of the steel pipe sheet pile 9a by welding or the like in water. The underwater guide material 17 is integrated in advance, and the guide portions 17a are connected to each other on land.

次に、図5に示すように、水中導材17の配置に対応する位置の気中に、気中導材19を配置する。すなわち、水中導材17のガイド部17aと架台5に設けられる気中導材19とが鉛直方向に一直線上になるように気中導材19を配置する。 Next, as shown in FIG. 5, the aerial guiding material 19 is arranged in the air at a position corresponding to the arrangement of the underwater guiding material 17. That is, the air guide material 19 is arranged so that the guide portion 17a of the underwater guide material 17 and the air guide material 19 provided on the gantry 5 are aligned in the vertical direction.

この状態で上部に仮杭21があらかじめ接合されたガイド杭23をクレーン7で吊り上げて、気中導材19と水中導材17とで位置決めされた所定の位置に吊り下ろす。さらに、杭打ち船から、ガイド杭23を掘削基盤13に打設する。以上により、所定数のガイド杭23を、掘削基盤13の所定の位置に打設することができる。このように、気中導材19と水中導材17を用いることで、ガイド杭23を所定の位置に正確にまっすぐに設置することができる。 In this state, the guide pile 23 to which the temporary pile 21 is joined in advance is lifted by the crane 7 and hung at a predetermined position positioned by the aerial guide material 19 and the underwater guide material 17. Further, the guide pile 23 is driven into the excavation base 13 from the pile driver. As described above, a predetermined number of guide piles 23 can be driven into a predetermined position of the excavation base 13. In this way, by using the aerial guide material 19 and the underwater guide material 17, the guide pile 23 can be installed accurately and straight at a predetermined position.

なお、ガイド杭23を掘削基盤13に打設した後、仮杭21の上端は、水上に露出する。したがって、仮杭21の上端位置を陸上から計測することで、ガイド杭23の位置と、打設深さとを正確に知ることができる。なお、ガイド杭23の設置が完了した後は、仮杭21は、撤去される。 After the guide pile 23 is driven into the excavation base 13, the upper end of the temporary pile 21 is exposed on the water. Therefore, by measuring the upper end position of the temporary pile 21 from the land, the position of the guide pile 23 and the driving depth can be accurately known. After the installation of the guide pile 23 is completed, the temporary pile 21 is removed.

次に、図6に示すように、ガイド杭23の上端に蓋25を配置する。この際、必要に応じて、それぞれのガイド杭23を所定の長さに切断する。蓋25は、切断によって生じるガイド杭23上部の凹凸を覆うとともに、ガイド杭23の上端に平坦部を形成するものである。 Next, as shown in FIG. 6, the lid 25 is arranged at the upper end of the guide pile 23. At this time, if necessary, each guide pile 23 is cut to a predetermined length. The lid 25 covers the unevenness of the upper portion of the guide pile 23 caused by cutting, and forms a flat portion at the upper end of the guide pile 23.

ここで、複数のガイド杭23は、それぞれ掘削基盤13からの長さが異なるように設置される。前述したように、各ガイド杭23の打設深さは、仮杭21によって計測されているため、ガイド杭23の上部の所定長さを切断することで、掘削基盤13からの長さを正確に調整することができる。 Here, the plurality of guide piles 23 are installed so as to have different lengths from the excavation base 13. As described above, since the driving depth of each guide pile 23 is measured by the temporary pile 21, the length from the excavation base 13 can be accurately obtained by cutting the predetermined length of the upper part of the guide pile 23. Can be adjusted to.

なお、ガイド杭23は、少なくも3本配置することが望ましい。この場合、3本のガイド杭23の高さをすべて変えることが望ましい。ガイド杭23を設置した後には、水中導材17が必要に応じて撤去される。 It is desirable to arrange at least three guide piles 23. In this case, it is desirable to change the heights of all three guide piles 23. After installing the guide pile 23, the underwater guide material 17 is removed as needed.

次に、図7に示すように、曲部付管体構造体27を吊降ろし、掘削基盤13上に設置する。曲部付管体構造体27は、曲部付管体29と、曲部付管体29の受け台31とが一体化されたものである。曲部付管体29は、一方の端部が上方に向けて形成され、他方の端部が略垂直に曲がって略水平方向に向けて形成される。すなわち、曲部付管体構造体27の側方に向けて、曲部付管体29の端部が配置され、当該端部にはバルクヘッド部29aが設けられる。バルクヘッド部29aは、横坑と接続される部位である。 Next, as shown in FIG. 7, the pipe structure 27 with a curved portion is hung and installed on the excavation base 13. The curved pipe structure 27 is an integral body of the curved pipe 29 and the cradle 31 of the curved pipe 29. One end of the curved tube 29 is formed upward, and the other end is bent substantially vertically to be formed in a substantially horizontal direction. That is, the end portion of the curved portion-attached pipe body 29 is arranged toward the side of the curved portion-attached pipe structure 27, and the bulkhead portion 29a is provided at the end portion. The bulkhead portion 29a is a portion connected to the bulkhead.

曲部付管体構造体27の下部には、嵌合部33が設けられる。嵌合部33は、ガイド杭23の位置に応じた位置に設けられる凹部である。すなわち、曲部付管体構造体27は、ガイド杭23と嵌合部33とを嵌合させて、掘削基盤13上に設置される。 A fitting portion 33 is provided at the lower portion of the tubular structure 27 with a curved portion. The fitting portion 33 is a recess provided at a position corresponding to the position of the guide pile 23. That is, the pipe structure 27 with a curved portion is installed on the excavation base 13 by fitting the guide pile 23 and the fitting portion 33.

ここで、嵌合部33の深さは、対応するガイド杭23の長さに応じて設定される。すなわち、長いガイド杭23が嵌合する嵌合部33は、ガイド杭23の長さに応じて深さが深く、短いガイド杭23が嵌合する嵌合部33は、ガイド杭23の長さに応じて深さが浅い。 Here, the depth of the fitting portion 33 is set according to the length of the corresponding guide pile 23. That is, the fitting portion 33 into which the long guide pile 23 is fitted has a deep depth according to the length of the guide pile 23, and the fitting portion 33 into which the short guide pile 23 is fitted has the length of the guide pile 23. The depth is shallow according to.

ガイド杭23の長さが互いに異なるため、曲部付管体構造体27を吊り下ろす際、ガイド杭23と嵌合部33との嵌合が、それぞれ別々のタイミングで行われる。このため、位置合わせが容易である。なお、嵌合部33の下端は、テーパ上に拡開されているため、位置決めが容易である。 Since the lengths of the guide piles 23 are different from each other, when the pipe structure 27 with a curved portion is hung, the guide piles 23 and the fitting portion 33 are fitted at different timings. Therefore, the alignment is easy. Since the lower end of the fitting portion 33 is widened on the taper, positioning is easy.

なお、複数のガイド杭23の内の一本は、バルクヘッド部29a側に配置し、他のガイド杭23を、バルクヘッド部29aから離れた位置に配置することが望ましい。このようにすることで、バルクヘッド部29aの位置を正確に位置決めすることができる。 It is desirable that one of the plurality of guide piles 23 is arranged on the bulkhead portion 29a side, and the other guide piles 23 are arranged at a position away from the bulkhead portion 29a. By doing so, the position of the bulkhead portion 29a can be accurately positioned.

さらに、深い嵌合部33の径を大きくし、短い嵌合部33の径を小さくすることで、最初に嵌合するガイド杭23と嵌合部33とで位置を粗く決め、最後に挿入されるガイド杭23と嵌合部33によって、より正確な位置決めを行うこともできる。この場合、最もガイド杭23と嵌合部33との嵌合の精度の高い部位を、バルクヘッド部29aの位置に配置することが望ましい。 Further, by increasing the diameter of the deep fitting portion 33 and decreasing the diameter of the short fitting portion 33, the positions of the guide pile 23 and the fitting portion 33 to be fitted first are roughly determined, and the fitting portion 33 is inserted last. More accurate positioning can be performed by the guide pile 23 and the fitting portion 33. In this case, it is desirable to arrange the portion having the highest fitting accuracy between the guide pile 23 and the fitting portion 33 at the position of the bulkhead portion 29a.

なお、曲部付管体構造体27の上部には、複数の視準棒37が接合される。視準棒37の位置を陸上から計測することで、曲部付管体構造体27の設置位置および姿勢を確認することができる。 A plurality of collimation rods 37 are joined to the upper portion of the tubular structure 27 with a curved portion. By measuring the position of the collimation rod 37 from the land, it is possible to confirm the installation position and posture of the tubular structure 27 with a curved portion.

図8に示すように、完全に曲部付管体構造体27を掘削基盤13上に設置した状態で、ガイド杭23の上端(蓋25の上面)が、嵌合部33の天面と接触する。したがって、ガイド杭23は、曲部付管体構造体27の支持部材としても機能する。なお、完全に曲部付管体構造体27を掘削基盤13上に設置すると、視準棒37は撤去される。 As shown in FIG. 8, the upper end of the guide pile 23 (upper surface of the lid 25) comes into contact with the top surface of the fitting portion 33 in a state where the pipe structure 27 with a curved portion is completely installed on the excavation base 13. To do. Therefore, the guide pile 23 also functions as a support member for the pipe structure 27 with a curved portion. When the pipe structure 27 with a curved portion is completely installed on the excavation base 13, the collimation rod 37 is removed.

曲部付管体構造体27には、計測管35が配置される。計測管35の一端は、曲部付管体29のバルクヘッド部29a近傍に接合される。計測管35の下端(バルクヘッド部29a)には、計測基準が配置される。また、計測管35の上部には、管体39が接続される。 A measuring tube 35 is arranged in the tube structure 27 with a curved portion. One end of the measuring tube 35 is joined to the vicinity of the bulkhead portion 29a of the tube body 29 with a curved portion. A measurement reference is arranged at the lower end (bulkhead portion 29a) of the measuring tube 35. Further, a tube body 39 is connected to the upper part of the measuring tube 35.

管体39の上端は、気中に露出する。架台5には、計測器41が配置される。管体39および計測管35の内部の水を排水し、管体39の上方から、計測器41によって、管体39および計測管35の下方の計測基準を計測することが可能である。この際、管体39は、架台5等とは接触しない。このため、管体39が、波などの影響で多少動いたとしても、計測器41がその影響を受けないため、計測基準の位置を正確に把握することができる。 The upper end of the tube 39 is exposed in the air. A measuring instrument 41 is arranged on the gantry 5. It is possible to drain the water inside the tube 39 and the measuring tube 35, and measure the measurement reference below the tube 39 and the measuring tube 35 from above the tube 39 with the measuring instrument 41. At this time, the pipe body 39 does not come into contact with the gantry 5 or the like. Therefore, even if the tube 39 moves slightly due to the influence of waves or the like, the measuring instrument 41 is not affected by the influence, so that the position of the measurement reference can be accurately grasped.

また、計測器41の位置を陸上から計測することで、より詳細に、曲部付管体29のバルクヘッド部29aの位置を把握することができる。完全に曲部付管体29のバルクヘッド部29aの位置が把握されたのち、管体39は撤去される。 Further, by measuring the position of the measuring instrument 41 from the land, the position of the bulkhead portion 29a of the tube body 29 with a curved portion can be grasped in more detail. After the position of the bulkhead portion 29a of the curved pipe body 29 is completely grasped, the pipe body 39 is removed.

次に、図9に示すように、曲部付管体29の周囲に、中詰材43を充填する。中詰材43は、水中不分離性セメントミルクであり、JIS R5201によるフロー値が320〜380mmであることが望ましい。このようにすることで、鋼材からなる受け台31の内部に中詰材43を容易に充填することができる。 Next, as shown in FIG. 9, the filling material 43 is filled around the tubular body 29 with a curved portion. The filling material 43 is a non-separable cement milk in water, and it is desirable that the flow value according to JIS R5201 is 320 to 380 mm. By doing so, the filling material 43 can be easily filled in the cradle 31 made of a steel material.

また、中詰材43の単位体積重量は、掘削した地盤の単位体積重量以下であることが望ましい。すなわち、中詰材43を充填した際に、掘削基盤13にかかる荷重が、掘削前の状態と比較して過剰に大きくならなければ、中詰材43が充填された曲部付管体構造体27を支持する際に、基礎杭が不要である。したがって、施工が容易となる。なお、セメントミルクの単位体積重量の調整には、例えば、フライアッシュ(石炭灰)などが用いられる。また、セメントミルクの単位体積重量としては、例えば、1500kg/m以下である。 Further, it is desirable that the unit volume weight of the filling material 43 is equal to or less than the unit volume weight of the excavated ground. That is, if the load applied to the excavation base 13 when the filling material 43 is filled does not become excessively large as compared with the state before excavation, the pipe structure with a curved portion filled with the filling material 43 No foundation pile is required to support 27. Therefore, the construction becomes easy. For example, fly ash (coal ash) or the like is used to adjust the unit volume weight of cement milk. The unit volume weight of cement milk is, for example, 1500 kg / m 3 or less.

なお、中詰材43の水中不分離性セメントミルクの練り混ぜ水の一部には海水が用いられる。このようにすることで、海上に多量の清水を運搬して貯蔵する必要がない。このようにすることで、海上プラント上で、セメントミルクを練り混ぜて、中詰材43として使用することができる。なお、不分離剤は、清水を用いてスラリーとして投入することが望ましい。清水の方が、長時間スラリーの品質を保持できるためである。 Seawater is used as a part of the mixed water of the inseparable cement milk in water of the filling material 43. By doing so, it is not necessary to transport and store a large amount of fresh water over the sea. By doing so, the cement milk can be kneaded and used as the filling material 43 on the offshore plant. It is desirable that the non-separating agent is added as a slurry using fresh water. This is because fresh water can maintain the quality of the slurry for a long time.

以上により、曲部付管体の支持構造47の施工が完了する。次に、自己昇降式作業台船1を移動させる。この際、レグ3を海底11から引き抜くが、軟弱地盤に設置する際には、レグ3が海底11に深く陥入される。このため、レグ3と海底11とが密着し、レグ3の引き抜きが困難となる場合がある。 With the above, the construction of the support structure 47 of the pipe body with a curved portion is completed. Next, the self-elevating workbench 1 is moved. At this time, the leg 3 is pulled out from the seabed 11, but when it is installed on soft ground, the leg 3 is deeply recessed into the seabed 11. For this reason, the leg 3 and the seabed 11 may come into close contact with each other, making it difficult to pull out the leg 3.

本実施形態では、図10に示すように、レグ3に沿って、あらかじめジェット配管45を配置しておき、レグ3を引き抜く際には、レグ3の下端近傍にジェットを噴射する。このようにすることで、特にレグ3の下端面と地盤とが縁切りされて、レグ3の引き抜き抵抗を削減することができる。 In the present embodiment, as shown in FIG. 10, a jet pipe 45 is arranged in advance along the leg 3, and when the leg 3 is pulled out, a jet is injected near the lower end of the leg 3. By doing so, the lower end surface of the leg 3 and the ground are particularly cut off, and the pull-out resistance of the leg 3 can be reduced.

その後、図11に示すように、曲部付管体29に横坑53を接続する。横坑53は、シールド工法等の公知の方法で構築される。例えば、曲部付管体29の端部(バルクヘッド部29a)を、コンクリートが充填されたさや管と隔壁とで構成し、シールドトンネル等の横坑53をさや管まで構築する。その後、さや管と横坑53とを連結することで、曲部付管体29に横坑53が接続される。 After that, as shown in FIG. 11, the horizontal shaft 53 is connected to the pipe body 29 with a curved portion. The side shaft 53 is constructed by a known method such as a shield method. For example, the end portion (bulk head portion 29a) of the pipe body 29 with a curved portion is composed of a sheath pipe filled with concrete and a partition wall, and a side shaft 53 such as a shield tunnel is constructed up to the sheath pipe. After that, by connecting the sheath pipe and the horizontal shaft 53, the horizontal shaft 53 is connected to the pipe body 29 with a curved portion.

このように、曲部付管体29にシールド工法等の公知の方法で構築した横坑53を接続することで、横坑53と曲部付管体29とが接続された放水路50が施工される。なお、曲部付管体29の上部には、放水口51が設置される。また、横坑53の他端は立坑55と接続され、発電所57からの排水を放水することができる。 In this way, by connecting the horizontal shaft 53 constructed by a known method such as a shield method to the curved pipe body 29, the drainage channel 50 in which the horizontal shaft 53 and the curved pipe 29 are connected is constructed. Will be done. A water discharge port 51 is installed above the pipe body 29 with a curved portion. Further, the other end of the horizontal shaft 53 is connected to the vertical shaft 55, and the drainage from the power plant 57 can be discharged.

以上説明したように、本実施形態によれば、極めて精度よく曲部付管体29を設置することが可能であるため、横坑53との接続が容易である。また、中詰材43の単位体積当たりの重量が小さいため、基礎杭が不要であり、作業が容易である。 As described above, according to the present embodiment, since the pipe body 29 with a curved portion can be installed with extremely high accuracy, it is easy to connect to the side shaft 53. Further, since the weight per unit volume of the filling material 43 is small, a foundation pile is not required and the work is easy.

なお、放水路50は、発電所57以外にも、工場等の取放水口等を構築する場合に用いることができる。また、海底11に放水路50を構築したが、同様の方法で湖沼や河川等の水底に構築してもよい。 In addition to the power plant 57, the drainage channel 50 can be used when constructing an intake / discharge port of a factory or the like. Further, although the drainage channel 50 is constructed on the seabed 11, the drainage channel 50 may be constructed on the bottom of a lake, river, or the like in the same manner.

以上、添付図を参照しながら、本発明の実施の形態を説明したが、本発明の技術的範囲は、前述した実施の形態に左右されない。当業者であれば、特許請求の範囲に記載された技術的思想の範疇内において各種の変更例または修正例に想到し得ることは明らかであり、それらについても当然に本発明の技術的範囲に属するものと了解される。 Although the embodiment of the present invention has been described above with reference to the attached drawings, the technical scope of the present invention does not depend on the above-described embodiment. It is clear that a person skilled in the art can come up with various modifications or modifications within the scope of the technical ideas described in the claims, and these are naturally within the technical scope of the present invention. It is understood that it belongs.

1………自己昇降式作業台船
3………レグ
5………架台
7………クレーン
9………鋼管矢板
9a………鋼管矢板井筒
11………海底
13………掘削基盤
15………腹起し
17………水中導材
17a………ガイド部
19………気中導材
21………仮杭
23………ガイド杭
25………蓋
27………曲部付管体構造体
29………曲部付管体
29a………バルクヘッド部
31………受け台
33………嵌合部
35………計測管
37………視準棒
39………管体
41………計測器
43………中詰材
45………ジェット配管
47………曲部付管体の支持構造
50………放水路
51………放水口
53………横坑
55………立坑
57………発電所
1 ………… Self-elevating workbench 3 ………… Leg 5 ………… Stand 7 ………… Crane 9 ………… Steel pipe sheet pile 9a ………… Steel pipe sheet pile Izutsu 11 ………… Seabed 13 ………… Excavation base 15 ……… Raised up 17 ……… Underwater guide material 17a ……… Guide part 19 ……… Aerial guide material 21 ……… Temporary pile 23 ……… Guide pile 25 ……… Lid 27 ……… Curved part Attached pipe structure 29 ………… Curved pipe 29a ………… Bulkhead portion 31 ………… Cradle 33 ………… Fitting portion 35 ………… Measuring pipe 37 ………… Collimation rod 39 …… … Pipe 41 ………… Measuring instrument 43 ………… Filling material 45 ………… Jet pipe 47 ………… Support structure of pipe with curved part 50 ………… Discharge channel 51 ………… Discharge port 53 ………… Horizontal shaft 55 ……… Vertical shaft 57 ……… Power plant

Claims (7)

水中において横坑と曲部付管体とが接合される放水路の施工方法であって、
水中に鋼管矢板井筒を構築する工程と、
前記鋼管矢板井筒の内部を掘削し、掘削基盤を施工する工程と、
前記掘削基盤に所定数のガイド杭を打設する工程と、
前記曲部付管体と、前記曲部付管体の受け台とが一体化された曲部付管体構造体を吊降ろし、前記曲部付管体構造体の下部に設けられた嵌合部を前記ガイド杭に嵌合させて、前記曲部付管体構造体を前記掘削基盤上に設置する工程と、
前記曲部付管体の周囲に中詰材を充填する工程と、
前記曲部付管体のバルクヘッド部と前記横坑とを接続する工程と、
を具備し、
前記ガイド杭は、少なくとも3本配置され、
少なくとも1本の前記ガイド杭を前記バルクヘッド部側に配置し、他の前記ガイド杭を、前記バルクヘッド部から離れた位置に配置し、
それぞれの前記ガイド杭の設置位置を位置決めするための水中導材が一体で構成され、前記水中導材が水中において、前記鋼管矢板井筒に固定され、前記水中導材と対応する位置の気中に、前記ガイド杭の設置位置を位置決めするための気中導材が配置され、前記ガイド杭は、前記気中導材および前記水中導材によって位置決めされた位置に打設されることを特徴とする放水路の施工方法。
It is a construction method of a drainage channel where a horizontal shaft and a pipe with a curved part are joined in water.
The process of constructing a steel pipe sheet pile in water and
The process of excavating the inside of the steel pipe sheet pile cylinder and constructing the excavation base,
The process of driving a predetermined number of guide piles on the excavation base and
A tubular body structure with a curved portion in which the tubular body with a curved portion and a pedestal of the tubular body with a curved portion are integrated is hung, and a fitting provided at a lower portion of the tubular structure with a curved portion is provided. A step of fitting the portion to the guide pile and installing the pipe structure with a curved portion on the excavation base.
The step of filling the filling material around the curved tube body and
A step of connecting the bulkhead portion of the curved pipe body and the side shaft, and
Equipped with
At least three guide piles are arranged.
At least one of the guide piles is arranged on the bulkhead portion side, and the other guide piles are arranged at a position away from the bulkhead portion.
An underwater guide material for positioning the installation position of each of the guide piles is integrally formed, and the underwater guide material is fixed to the steel pipe sheet pile cylinder in water and in the air at a position corresponding to the underwater guide material. the aerial guide member for positioning the installation position of the guide piles are arranged, the guide piles is characterized Rukoto is Da設to the position positioned by the aerial guide member and the water guide member Construction method of drainage channel.
水中において横坑と曲部付管体とが接合される放水路の施工方法であって、
水中に鋼管矢板井筒を構築する工程と、
前記鋼管矢板井筒の内部を掘削し、掘削基盤を施工する工程と、
前記掘削基盤に所定数のガイド杭を打設する工程と、
前記曲部付管体と、前記曲部付管体の受け台とが一体化された曲部付管体構造体を吊降ろし、前記曲部付管体構造体の下部に設けられた嵌合部を前記ガイド杭に嵌合させて、前記曲部付管体構造体を前記掘削基盤上に設置する工程と、
前記曲部付管体の周囲に中詰材を充填する工程と、
前記曲部付管体のバルクヘッド部と前記横坑とを接続する工程と、
を具備し、
複数の前記ガイド杭を配置し、それぞれの前記ガイド杭の前記掘削基盤からの長さが異なり、複数の前記ガイド杭と前記嵌合部との嵌合がそれぞれ別々のタイミングで行われることを特徴とする放水路の施工方法。
It is a construction method of a drainage channel where a horizontal shaft and a pipe with a curved part are joined in water.
The process of constructing a steel pipe sheet pile in water and
The process of excavating the inside of the steel pipe sheet pile cylinder and constructing the excavation base,
The process of driving a predetermined number of guide piles on the excavation base and
A tubular body structure with a curved portion in which the tubular body with a curved portion and a pedestal of the tubular body with a curved portion are integrated is hung, and a fitting provided at a lower portion of the tubular structure with a curved portion is provided. A step of fitting the portion to the guide pile and installing the pipe structure with a curved portion on the excavation base.
The step of filling the filling material around the curved tube body and
A step of connecting the bulkhead portion of the curved pipe body and the side shaft, and
Equipped with
Arranging a plurality of the guide piles, different lengths from the drilling platform of each of said guide piles, the Rukoto fitting between a plurality of said guide piles and the fitting portion is performed at different timings, respectively A characteristic drainage channel construction method.
前記掘削基盤からの長さが長い前記ガイド杭が嵌合する前記嵌合部の径が、短い前記ガイド杭が嵌合する前記嵌合部の径より大きいことを特徴とする請求項2記載の放水路の施工方法。 The second aspect of claim 2, wherein the diameter of the fitting portion to which the guide pile having a long length from the excavation base is fitted is larger than the diameter of the fitting portion to which the guide pile having a short length is fitted. Construction method of the tailrace. 水中において横坑と曲部付管体とが接合される放水路の施工方法であって、
水中に鋼管矢板井筒を構築する工程と、
前記鋼管矢板井筒の内部を掘削し、掘削基盤を施工する工程と、
前記掘削基盤に所定数のガイド杭を打設する工程と、
前記曲部付管体と、前記曲部付管体の受け台とが一体化された曲部付管体構造体を吊降ろし、前記曲部付管体構造体の下部に設けられた嵌合部を前記ガイド杭に嵌合させて、前記曲部付管体構造体を前記掘削基盤上に設置する工程と、
前記曲部付管体の周囲に中詰材を充填する工程と、
前記曲部付管体のバルクヘッド部と前記横坑とを接続する工程と、
を具備し、
前記中詰材は、水中不分離性セメントミルクであり、JIS R5201によるフロー値が320〜380mmで、単位体積重量が、掘削した地盤の単位体積重量以下であることを特徴とする放水路の施工方法。
It is a construction method of a drainage channel where a horizontal shaft and a pipe with a curved part are joined in water.
The process of constructing a steel pipe sheet pile in water and
The process of excavating the inside of the steel pipe sheet pile cylinder and constructing the excavation base,
The process of driving a predetermined number of guide piles on the excavation base and
A tubular body structure with a curved portion in which the tubular body with a curved portion and a pedestal of the tubular body with a curved portion are integrated is hung, and a fitting provided at a lower portion of the tubular structure with a curved portion is provided. A step of fitting the portion to the guide pile and installing the pipe structure with a curved portion on the excavation base.
The step of filling the filling material around the curved tube body and
A step of connecting the bulkhead portion of the curved pipe body and the side shaft, and
Equipped with
Wherein during filling material is a water non-separability cement milk flow value by JIS R5201 is in 320~380Mm, specific weight is, the spillway characterized by specific weight less der Rukoto of excavated soil Construction method.
前記中詰材の水中不分離性セメントミルクの練り混ぜ水の一部に海水が用いられることを特徴とする請求項記載の放水路の施工方法。 The method for constructing a drainage channel according to claim 4 , wherein seawater is used as a part of the mixed water of the inseparable cement milk in water of the filling material. 前記曲部付管体構造体の上部には、複数の視準棒が接合され、
前記視準棒の位置を陸上から計測することで、前記曲部付管体構造体の設置位置を確認することを特徴とする請求項1から請求項のいずれかに記載の放水路の施工方法。
A plurality of collimation rods are joined to the upper part of the curved tubular structure.
The construction of the drainage channel according to any one of claims 1 to 5 , wherein the installation position of the tubular structure with a curved portion is confirmed by measuring the position of the collimation rod from the land. Method.
水中における曲部付管体の支持構造であって、
鋼管矢板井筒の内部の基盤に打設されたガイド杭と、
前記ガイド杭の上部に配置された、曲部付管体と、前記曲部付管体の受け台とが一体化された曲部付管体構造体と、
前記曲部付管体の外周に充填された中詰材と、
を具備し、
前記曲部付管体構造体は、前記曲部付管体構造体の下部に設けられた嵌合部と前記ガイド杭が嵌合しており、
前記中詰材は、水中不分離性セメントミルクであり、JIS R5201によるフロー値が320〜380mmで、単位体積重量が、掘削した地盤の単位体積重量以下であることを特徴とする水中における曲部付管体の支持構造。
It is a support structure for a tube with a curved part in water.
Guide piles placed on the inner base of the steel pipe sheet pile
A pipe structure with a curved portion, which is arranged on the upper part of the guide pile, and a pipe structure with a curved portion in which a pedestal of the pipe with a curved portion is integrated.
The filling material filled on the outer circumference of the curved tube body and
Equipped with
In the curved pipe structure, the fitting portion provided at the lower part of the curved pipe structure and the guide pile are fitted to each other.
The filling material is inseparable cement milk in water, and has a flow value of 320 to 380 mm according to JIS R5201 and a unit volume weight equal to or less than the unit volume weight of the excavated ground. Support structure of attached tube.
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