JP5306885B2 - Construction method for underwater structures - Google Patents

Construction method for underwater structures Download PDF

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JP5306885B2
JP5306885B2 JP2009097628A JP2009097628A JP5306885B2 JP 5306885 B2 JP5306885 B2 JP 5306885B2 JP 2009097628 A JP2009097628 A JP 2009097628A JP 2009097628 A JP2009097628 A JP 2009097628A JP 5306885 B2 JP5306885 B2 JP 5306885B2
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water
wave
gap
underwater structure
plate
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JP2010248745A (en
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栄世 岩村
輝道 秦
毅 池谷
聡志 永嶋
一也 小野田
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Kajima Corp
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    • Y—GENERAL 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
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for constructing an underwater structure capable of being installed even on the uneven bottom of the water, without forming a gap between the underwater structure and the bottom of the water, in the installation of the underwater structure such as an intake pool for atomic power generation. <P>SOLUTION: The intake pool 1 is formed, for example, of a submerged dyke 7 which is installed in such a manner as to surround an intake 3 provided in an atomic power plant 2. The submerged dyke 7 is the underwater structure which is installed in a position lower than a sea level 5. The intake pool 1 has to supply marine water in the intake pool 1 to the intake 3 without the outflow of the marine water in the intake pool 1, even when the sea level 5 becomes lower than an upper end of the submerged dyke 7. Thus, a water shut-off portion 11 for preventing the outflow of the marine water to the outside of the intake pool 1 is provided in the lower portion of the submerged dyke 7. More specifically, the water shut-off portion 11 is used to prevent the outflow of the marine water to the outside of the intake pool 1 by filling a gap between the submerged dyke 7 and the bottom of the sea. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

本発明は、たとえば原子力発電所における取水口を囲む取水プールなどの水中構造物であって、不陸な場所に設置可能であり、下部からの水の流出を防ぐことが可能な水中構造物の施工方法に関するものである。   The present invention is an underwater structure such as a water intake pool surrounding a water intake in a nuclear power plant, for example, which can be installed in a landless area and can prevent water from flowing out from below. It relates to the construction method.

従来、例えば、原子力発電所に用いられる冷却水などは、海水等を取水口より取水して使用される。原子力発電においては、冷却水の供給が停止すると大きな損害を与える恐れがあるため、取水口は干潮時海面よりも十分に低い位置に設けられ、取水口が海面上に露出することがないように設置される。   Conventionally, for example, cooling water or the like used in a nuclear power plant is used by taking seawater or the like from a water intake. In nuclear power generation, if the cooling water supply stops, there is a risk of serious damage, so the intake is located at a position sufficiently lower than the sea level at low tide so that the intake is not exposed on the sea surface. Installed.

しかし、地震等により津波が発生すると、津波による引き波時に海面が低下し、取水口が海面に露出する恐れがある。このため、通常は、取水口を取り囲むように取水プールが設けられ、津波による引き波時においても、必要な量の海水が確保される。   However, when a tsunami occurs due to an earthquake or the like, the sea level may drop when the tsunami pulls, and the intake may be exposed to the sea surface. For this reason, usually, a water intake pool is provided so as to surround the water intake, and a necessary amount of seawater is ensured even during a tsunami wave.

このような取水プールを形成するような原子力発電所の取水設備としては、たとえば開口部が設けられたカーテンウォールを海水取水口およびスクリーン設備を囲むように設置し、カーテンウォールとスクリーン設備の間に水中堰を設けた原子力発電所の取水設備がある（特許文献１）。   As an intake facility of a nuclear power plant that forms such an intake pool, for example, a curtain wall provided with an opening is installed so as to surround a seawater intake port and a screen facility, and the curtain wall and the screen facility are interposed between them. There is a water intake facility of a nuclear power plant provided with an underwater weir (Patent Document 1).

また、海中に設置される構造体として、海中に所定間隔をあけて杭を設置し、杭間に砂止め用部材を設置する海域制御方法がある（特許文献２）。   Moreover, there exists a sea area control method which installs a pile at predetermined intervals in the sea as a structure installed in the sea, and installs the member for sand prevention between piles (patent document 2).

特開平９−５４１９０JP-A-9-54190 特開平８−９２９３５JP-A-8-92935

しかしながら、特許文献１に記載の取水設備は、カーテンウォールおよび水中堰を海底に取水口を囲むように連続して埋設設置する必要があり、また、広い範囲を掘削する必要があることから、施工納期およびコストがかかり、また、取水プール内に工事に伴う汚濁水が多量に発生するという問題がある。   However, the water intake facility described in Patent Document 1 requires that the curtain wall and the underwater weir be continuously embedded in the sea bottom so as to surround the water intake, and that it is necessary to excavate a wide area. There is a problem that delivery time and cost are increased, and a large amount of contaminated water is generated in the intake pool due to construction.

また、特許文献２のように、水中構造物として複数の杭を所定間隔で設置し、杭間に上方から砂止め用部材を落とし込む方法では、杭のみを海底に埋設設置して、砂止め用部材を海底に埋設設置する必要はないため、施工期間およびコスト低減には寄与するが、海底が不陸である場合には、砂止め用部材と海底との隙間が生じてしまうという問題がある。したがって、例えば本方法によって取水プールを構築した場合、取水プール内の水が隙間から流出してしまうという問題がある。   Further, as in Patent Document 2, in a method of installing a plurality of piles as underwater structures at predetermined intervals and dropping a sand-preventing member from above between the piles, only the piles are buried and installed on the seabed, Since it is not necessary to embed the member in the seabed, it contributes to the construction period and cost reduction. However, when the seabed is uneven, there is a problem that a gap between the sand stopper member and the seabed occurs. . Therefore, for example, when a water intake pool is constructed by this method, there is a problem that water in the water intake pool flows out from the gap.

本発明は、このような問題に鑑みてなされたもので、その目的とするところは、例えば原子力発電の取水プールのような水中構造物の設置に際し、不陸な水底であっても、水底との隙間を形成せずに設置可能な水中構造物の施工方法を提供することである。   The present invention has been made in view of such problems, and the object of the present invention is, for example, when installing an underwater structure such as a water intake pool for nuclear power generation, It is providing the construction method of the underwater structure which can be installed, without forming the clearance gap.

前述した目的を達成するための第１の発明は、水底地盤をケーシングを用いて掘削し、防波板保持部を有する杭を設置する工程（ａ）と、所定の間隔をあけて設けられた前記杭の間に、下部に遮水手段を有する防波板を、前記防波板保持部を用いて設置する工程（ｂ）と、前記防波板と水底との隙間を、前記遮水手段を用いて塞ぐ工程（ｃ）と、を具備することを特徴とする水中構造物の施工方法である。   The first invention for achieving the above-described object is provided with a predetermined interval from the step (a) of excavating the water bottom ground using a casing and installing a pile having a wave-breaking plate holding portion. A step (b) of installing a wave-breaking plate having a water-blocking means at a lower portion between the piles using the wave-blocking plate holding portion, and a gap between the wave-blocking plate and the water bottom, the water-blocking means And (c) a step of closing using a water, and a construction method for an underwater structure.

前記工程（ｃ）は、前記遮水手段へ通ずる管体を用い、水上より前記遮水手段へ充填材を充填して前記防波板と水底との隙間を塞ぐことが望ましい。   In the step (c), it is desirable to use a pipe that communicates with the water shielding means and fill the water shielding means with a filler from above the water to close the gap between the wave preventing plate and the water bottom.

この場合、前記遮水手段は、前記防波板下部に設けられた袋状部材であり、前記管体は前記袋状部材に通じており、前記工程（ｃ）は、前記袋状部材へ水上より充填材を充填し、前記袋状部材が膨れることで、前記防波板と水底との隙間を塞いでもよく、前記遮水手段は、前記防波板下部に設けられた袋状のラス網であり、前記管体は前記ラス網内に通じており、前記工程（ｃ）は、前記ラス網が水底の形状に応じて変形し、前記ラス網で囲まれた部位に水上より充填材を充填し、前記防波板と水底との隙間を塞いでもよく、また、前記遮水手段は、前記防波板下部に設けられた型枠であり、前記管体は前記型枠内に通じており、前記工程（ｃ）は、水底の形状に応じて変形可能な隙間塞ぎ部材を前記防波板と水底との隙間を埋めるように配置し、前記型枠および前記隙間塞ぎ部材とで囲まれた部位に水上より充填材を充填し、前記防波板と水底との隙間を塞いでもよい。   In this case, the water shielding means is a bag-like member provided in the lower part of the wave preventing plate, the tubular body communicates with the bag-like member, and the step (c) The bag-like member may be further filled to fill the gap between the wave-proof plate and the water bottom, and the water-blocking means is a bag-shaped lath net provided at the lower part of the wave-proof plate. The pipe body communicates with the lath net, and in the step (c), the lath net is deformed according to the shape of the bottom of the water, and a filler is applied to the portion surrounded by the lath net from above the water. It may be filled to close a gap between the wave preventing plate and the bottom of the water, and the water shielding means is a mold provided at a lower part of the wave preventing plate, and the tubular body communicates with the inside of the mold. In the step (c), a gap closing member that can be deformed according to the shape of the water bottom is disposed so as to fill the gap between the wave preventing plate and the water bottom. And, filling the mold and fillers than water to the site surrounded by the said gap closing member, may block the gap between the anti-wave plate and the bottom of the water.

前記遮水手段は、前記防波板下部に設けられたゴム部材であり、前記工程（ｃ）は、前記ゴム部材が水底の形状に応じて変形することにより、前記防波板と水底との隙間を塞でもよい。   The water shielding means is a rubber member provided at a lower part of the wave preventing plate, and the step (c) includes the step of deforming the rubber member according to the shape of the water bottom, thereby The gap may be closed.

設置された前記杭の高さは水面よりも低く、杭頭が水中に没した状態であってもよく、前記水中構造物は発電所の取水プールを構成し、前記杭および前記防波板を発電所の取水口を囲むように設けてもよい。   The height of the installed pile may be lower than the water surface and the pile head may be submerged in water, and the underwater structure constitutes a water intake pool of a power plant, and the pile and the wave breaker plate You may provide so that the intake of a power plant may be enclosed.

本発明の水中構造物の施工方法によれば、杭間に設けられる防波板の下部には、遮水手段が設けられ、遮水手段によって海底と防波板との隙間が埋められるため、水中構造物で囲まれた範囲内の水が隙間から流出することがない。   According to the construction method of the underwater structure of the present invention, a water shielding means is provided at the lower part of the wave preventing plate provided between the piles, and the gap between the sea floor and the wave preventing plate is filled by the water shielding means. Water within the range surrounded by the underwater structure does not flow out of the gap.

特に、遮水手段に管体を接続し、管体から遮水手段へ充填材を充填すれば、防波板と水底との隙間を容易に埋めることができる。この場合、遮水手段が袋状部材または袋状ラス網であれば、容易に形状を変形するため、充填材充填時に確実に不陸な水底を埋めることができる。また、遮水手段が型枠であっても、型枠と水底との隙間をうめる土のうなどの隙間塞ぎ部材を設置することで、容易に隙間を埋めることができる。   In particular, if a pipe body is connected to the water shielding means and a filler is filled from the pipe body to the water shielding means, the gap between the wave preventing plate and the water bottom can be easily filled. In this case, if the water shielding means is a bag-like member or a bag-like lath net, the shape is easily deformed, so that it is possible to reliably fill the uneven water bottom when filling the filler. Even if the water shielding means is a mold, the gap can be easily filled by installing a gap closing member such as a sandbag that fills the gap between the mold and the water bottom.

また、遮水手段がゴム部材であれば、充填材を必要とせず、不陸な水底との隙間をゴムの変形によって埋めることができる。   Further, if the water shielding means is a rubber member, a filler is not required, and the gap with the unlanded water bottom can be filled by deformation of the rubber.

また、杭および防波板が水面よりも低く、例えば干潮時における最低水面位置よりも低ければ、杭頭などが水上に露出することがない。このため、波などにより杭や防波板に大きな力がかかることを防止することができる。   Moreover, if a pile and a wave-breaking plate are lower than the water surface, for example, if it is lower than the lowest water surface position at the time of low tide, a pile head etc. will not be exposed on the water. For this reason, it can prevent that big force is applied to a pile or a wave-breaking board by a wave etc.

また、ケーシングを用いて杭を設置するため、ケーシング内での杭の設置に際して、ケーシング外へ汚濁物が流出することがない。   Moreover, since a pile is installed using a casing, a contaminant does not flow out of the casing when the pile is installed in the casing.

本発明によれば、例えば原子力発電の取水プールのような水中構造物の設置に際し、不陸な水底であっても、水底との隙間を形成せずに設置可能な水中構造物の施工方法を提供することができる。   According to the present invention, for example, when installing an underwater structure such as a water intake pool for nuclear power generation, there is a construction method for an underwater structure that can be installed without forming a gap with the bottom of the water even if it is an uneven bottom. Can be provided.

潜堤７による取水プール１を示す図The figure which shows the intake pool 1 by the submarine 7 ケーシング１５を設置した状態を示す図The figure which shows the state which installed the casing 15 ケーシング１５内を掘削した状態を示す図The figure which shows the state which excavated the inside of the casing 15 ケーシング１５内に杭１９を設けた状態を示す図The figure which shows the state which provided the pile 19 in the casing 15 ケーシング施工領域１６内の汚濁水を排出する排水管２３を設置した状態を示す図The figure which shows the state which installed the drain pipe 23 which discharges the polluted water in the casing construction area | region 16 ケーシング１５を撤去した状態を示す図The figure which shows the state which removed the casing 15 杭１９間に袋体２７を有する防波板２５を設置する状態を示す図で、（ａ）は正面図、（ｂ）、（ｃ）は（ａ）のＦ−Ｆ線矢視図It is a figure which shows the state which installs the wave-proof board 25 which has the bag body 27 between the piles 19, (a) is a front view, (b), (c) is a FF line arrow directional view of (a). 防波板２５が設置された状態を示す図The figure which shows the state in which the wave-proof board 25 was installed 杭１９間にラス網３３を有する防波板２５を設置する状態を示す図で、（ａ）は正面図、（ｂ）、（ｃ）は（ａ）のＦ−Ｆ線矢視図It is a figure which shows the state which installs the wave-breaking board 25 which has the lath net | network 33 between the piles 19, (a) is a front view, (b), (c) is the FF line arrow directional view of (a). 杭１９間に型枠３７を有する防波板２５を設置する状態を示す図で、（ａ）は正面図、（ｂ）、（ｃ）は（ａ）のＦ−Ｆ線矢視図It is a figure which shows the state which installs the wave-proof board 25 which has the formwork 37 between the piles 19, (a) is a front view, (b), (c) is a FF line arrow directional view of (a). 杭１９間にゴムプレート４１を有する防波板２５を設置する状態を示す図で、（ａ）は正面図、（ｂ）、（ｃ）は（ａ）のＦ−Ｆ線矢視図It is a figure which shows the state which installs the wave-proof board 25 which has the rubber plate 41 between the piles, (a) is a front view, (b), (c) is a FF line arrow directional view of (a).

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、本実施の形態にかかる水中構造物である潜堤７により形成される取水プール１を示す図で、図１（ａ）は平面図、図１（ｂ）は図１（ａ）の矢視Ａによる立面図である。   Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a diagram showing a water intake pool 1 formed by a submerged dike 7 which is an underwater structure according to the present embodiment, FIG. 1 (a) is a plan view, and FIG. 1 (b) is FIG. 1 (a). FIG.

取水プール１は、例えば、原子力発電所２に設けられた取水口３を囲むように設けられた潜堤７により形成される。潜堤７は、海面５よりも低い位置に（すなわち海面５上に露出しないように）設けられた水中構造物である。   The intake pool 1 is formed by, for example, a submerged dike 7 provided so as to surround the intake port 3 provided in the nuclear power plant 2. The submerged levee 7 is an underwater structure provided at a position lower than the sea surface 5 (that is, not exposed on the sea surface 5).

潜堤７による取水プール１を設けることで、例えば津波等の発生時に、津波に伴う引き波の影響で海面レベルが取水口３よりも低くなり、取水が停止することを防止することができる。   By providing the intake pool 1 by the submerged levee 7, for example, when a tsunami occurs, the sea level is lower than the intake 3 due to the influence of the tsunami and the intake can be prevented from stopping.

取水プール１は、海面５が潜堤７の上端よりも低くなった場合であっても、取水プール１内の海水が流出せず、取水プール１内の海水を取水口３へ供給する必要がある。したがって、潜堤７の下部には、海水が取水プール１外へ流出させないための遮水部１１が設けられる。すなわち、遮水部１１は、潜堤７と海底との隙間から海水が取水プール１外へ流出することを防止するためのものであり、後述する遮水手段が設けられる。   In the intake pool 1, even when the sea level 5 is lower than the upper end of the submerged dike 7, the seawater in the intake pool 1 does not flow out, and it is necessary to supply the seawater in the intake pool 1 to the inlet 3. is there. Therefore, a water-impervious portion 11 for preventing seawater from flowing out of the intake pool 1 is provided at the lower part of the submerged levee 7. That is, the water-impervious portion 11 is for preventing seawater from flowing out of the water intake pool 1 from the gap between the submerged dike 7 and the seabed, and is provided with a water-impervious means described later.

なお、原子力発電所２の増設や設計変更により、より多くの取水が必要となった場合には、取水プールを増築または再構築する必要がある。この場合、できるだけ濁り成分が取水口３にいかないように、簡易に潜堤７を設置する必要がある。   In addition, when more water intake is required due to the expansion of the nuclear power plant 2 or the design change, it is necessary to expand or reconstruct the water intake pool. In this case, it is necessary to simply install the submerged dike 7 so that the turbid component does not reach the intake 3 as much as possible.

次に、本発明にかかる水中構造物である潜堤７の構築方法を説明する。図２〜図８は潜堤７の施工方法を示す図である。   Next, the construction method of the submerged dike 7 which is the underwater structure concerning this invention is demonstrated. 2-8 is a figure which shows the construction method of the submerged dike 7. FIG.

まず、図２に示すように、潜堤７を構築する部位の海底９にケーシング１５を設置する。ケーシング１５は例えば鋼管が用いられる。ケーシング１５は例えば図中矢印Ｂ方向に回転させながら海底９に建てこむ（図中矢印Ｃ方向）。ケーシング１５の下方先端の刃先が海底に突き刺されば、以後、汚濁成分はほとんど発生しない。   First, as shown in FIG. 2, a casing 15 is installed on the seabed 9 where the submergence 7 is constructed. For example, a steel pipe is used for the casing 15. The casing 15 is built on the seabed 9 while rotating in the direction of arrow B in the figure (in the direction of arrow C in the figure). If the cutting edge at the lower end of the casing 15 is pierced into the seabed, then no contaminating component is generated.

次に、図３に示すように、ケーシング１５内部（施工領域１６の海底９）を掘削し、掘削部１７を構築する。なお、掘削部１７を設ける際には、大量の汚濁成分が発生するが、汚濁成分はケーシング１５内にとどまり、施工領域１６から外へ流出することはない。したがって、施工領域近傍に取水口３がある場合であっても、取水口３へ汚濁水が流れることがなく、取水口３からの取水を止めて工事を行う必要がない。   Next, as shown in FIG. 3, the inside of the casing 15 (the seabed 9 of the construction area 16) is excavated to construct the excavation part 17. When the excavation part 17 is provided, a large amount of pollutant components are generated, but the pollutant components remain in the casing 15 and do not flow out of the construction area 16. Therefore, even if there is a water intake 3 in the vicinity of the construction area, the polluted water does not flow to the water intake 3, and it is not necessary to stop the water intake from the water intake 3 and perform the work.

次に、図４に示すように、掘削部１７に杭１９をクレーン等で挿入する。杭１９は、例えば鋼管杭、ＰＣ杭（プレストレストコンクリート杭）、ＰＨＣ杭（高強度プレストレストコンクリート杭）などが使用できる。杭１９が掘削部１７に挿入され、略鉛直方向に起立した状態で、杭１９とケーシング１５との隙間にモルタル２１を充填する。   Next, as shown in FIG. 4, the pile 19 is inserted into the excavation part 17 with a crane or the like. As the pile 19, for example, a steel pipe pile, a PC pile (prestressed concrete pile), a PHC pile (high strength prestressed concrete pile), and the like can be used. In a state where the pile 19 is inserted into the excavation part 17 and stands up in a substantially vertical direction, the gap between the pile 19 and the casing 15 is filled with mortar 21.

なお、杭１９は、掘削部１７へ設置した状態で、干潮時における海面５よりも上方へは露出することがない。すなわち、杭１９は常に海面下に潜っている。また、杭１９の高さは、取水プール１の大きさと原子力発電所２による取水量によって決定される。すなわち、引き波によって杭１９が海面状に露出した状態で、津波の周期を考慮し、引き波の間に、取水プール１内の海水量が取水量に対して十分である必要がある。   In addition, the pile 19 is not exposed above the sea level 5 at the time of low tide in the state installed in the excavation part 17. That is, the stake 19 is always submerged below the sea surface. Further, the height of the pile 19 is determined by the size of the water intake pool 1 and the amount of water taken by the nuclear power plant 2. That is, in the state where the pile 19 is exposed to the sea surface due to the pulling wave, the amount of seawater in the water intake pool 1 needs to be sufficient with respect to the water intake during the pulling wave.

次に、図５に示すように、必要に応じてケーシング１５内の汚濁水を排出する。汚濁水の排出には、例えば施工領域１６内に排水管２３を挿入し、外部に設けられたポンプによりケーシング１５内の汚濁水が吸い上げられる。汚濁水は、その後濾過して海上に放出される。施工領域１６内の汚濁水を排出した後または排出しながら、ケーシング１５を撤去する（図中矢印Ｄ方向）。なお、ケーシング１５の撤去は、モルタル２１が固まる前に行う必要がある。   Next, as shown in FIG. 5, the polluted water in the casing 15 is discharged as necessary. For discharging the polluted water, for example, the drain pipe 23 is inserted into the construction area 16 and the polluted water in the casing 15 is sucked up by a pump provided outside. The polluted water is then filtered and released to the sea. After discharging the polluted water in the construction area 16 or while discharging it, the casing 15 is removed (in the direction of arrow D in the figure). The casing 15 needs to be removed before the mortar 21 is hardened.

以上で杭１９の設置が完了する。図６は杭１９が設置された状態を示す図である。なお、同様の手順で、所定の間隔をあけて杭１９が複数設置される。杭１９は取水口３を取り囲むように設けられる。   This completes the installation of the pile 19. FIG. 6 is a diagram illustrating a state in which the pile 19 is installed. A plurality of piles 19 are installed with a predetermined interval in the same procedure. The pile 19 is provided so as to surround the water intake 3.

次に、図７に示すように、所定間隔で設けられた杭１９の間に、防波板２５を設置する。図７（ａ）は複数の杭１９が設置された正面図であり、図７（ｂ）、図７（ｃ）は、図７（ａ）のＦ−Ｆ線矢視方向から見た防波板２５の設置状態を示す図である。防波板２５としてはＰＣ製のプレキャスト板などが使用できる。   Next, as shown in FIG. 7, the wave-breaking plate 25 is installed between the piles 19 provided at predetermined intervals. Fig.7 (a) is a front view in which the several pile 19 was installed, FIG.7 (b) and FIG.7 (c) are the wave-proofs seen from the FF line arrow direction of Fig.7 (a). It is a figure which shows the installation state of the board 25. FIG. As the wave preventing plate 25, a precast plate made of PC or the like can be used.

杭１９の両側には、図示を省略した防波板保持部が設けられている。防波板保持部は、例えば溝状であり、杭１９の長手方向に設けられる。防波板２５は隣り合う杭１９の防波板保持部に沿って挿入される。なお、杭１９と防波板２５との接合部は、ある程度止水が確保され、防波板２５が杭１９から外れることがなければどのような態様であってもよい。   On both sides of the pile 19, wave-breaking plate holding portions (not shown) are provided. The wave preventing plate holding portion is, for example, a groove shape, and is provided in the longitudinal direction of the pile 19. The wave preventing plates 25 are inserted along the wave preventing plate holding portions of the adjacent piles 19. In addition, the junction part of the pile 19 and the wave preventing plate 25 may be in any form as long as water blocking is ensured to some extent and the wave preventing plate 25 is not detached from the pile 19.

防波板２５の下方縁部には、遮水手段である袋体２７が設けられる。袋体２７は樹脂製や布製等の部材であり、海面５上に通ずる管体であるホース２９が接続されている。   A bag body 27 serving as a water shielding means is provided at the lower edge of the wave preventing plate 25. The bag body 27 is a member made of resin or cloth, and is connected to a hose 29 that is a pipe body that leads to the sea surface 5.

防波板２５を設置する際には、まず、図７（ｂ）に示すように、袋体２７が空の状態で袋体２７およびホース２９とともに防波板２５を下方（矢印Ｅ方向）へ降ろす。   When installing the wave preventing plate 25, first, as shown in FIG. 7B, the wave preventing plate 25 is moved downward (in the direction of arrow E) together with the bag 27 and the hose 29 in the empty state. take down.

防波板２５（袋体２７）が海底９上に降ろされた後、図７（ｃ）に示すように、ホース２９を用いて、袋体２７内へ充填材であるモルタル３１等を充填する。モルタル３１が充填されると、袋体２７はモルタル３１によって膨らむ。この際、袋体２７は防波板２５および海底９と密着するように膨らむ。したがって、海底９が不陸であっても、海底９の形状に応じて袋体２７が変形しながら膨らむため、袋体２７は海底９と防波板２５との隙間を確実に埋めることができる。   After the wave preventing plate 25 (bag 27) is lowered onto the seabed 9, as shown in FIG. 7C, the bag 27 is filled with mortar 31 or the like as a filler using a hose 29. . When the mortar 31 is filled, the bag body 27 expands with the mortar 31. At this time, the bag body 27 is inflated so as to be in close contact with the wave preventing plate 25 and the seabed 9. Therefore, even if the seabed 9 is uneven, the bag body 27 swells while deforming according to the shape of the seabed 9, so that the bag body 27 can reliably fill the gap between the seabed 9 and the wave preventing plate 25. .

袋体２７に充填材を充填後、ホース２９をクリップ等の固定部材を用いて栓止めして、ホース２９から充填材が漏えいすることを防止する。充填材が固まった後、余分なホース２９を撤去する。以上により防波板２５の設置が完了する。   After filling the bag 27 with the filler, the hose 29 is stoppered with a fixing member such as a clip to prevent the filler from leaking from the hose 29. After the filler has hardened, the excess hose 29 is removed. Thus, the installation of the wave preventing plate 25 is completed.

図８は、全ての杭１９間に防波板２５を設置した状態を示す図である。防波板２５は杭１９とほぼ同高さであり、常に海面５よりも低い。したがって、海面５上に防波板２５および杭１９が露出することはない。すなわち、杭１９および防波板２５等によって潜堤７が構築される。また、防波板２５と海底９との間には、モルタル３１が充填された袋体２７が設けられ、遮水部１１が形成される。   FIG. 8 is a diagram illustrating a state in which the wave breaker plates 25 are installed between all the piles 19. The wave preventing plate 25 is almost the same height as the pile 19 and is always lower than the sea level 5. Therefore, the wave breaker 25 and the pile 19 are not exposed on the sea surface 5. That is, the dike 7 is constructed by the pile 19 and the wave breaker 25 and the like. Further, a bag body 27 filled with mortar 31 is provided between the wave preventing plate 25 and the seabed 9, and the water shielding portion 11 is formed.

このように、本実施の形態によれば、発電所の取水口３を取り囲むように潜堤７を容易に構築することができる。特に、潜堤７を構成する防波板２５の下方に袋体２７が設けられ、袋体２７へモルタル３１を充填することで、防波板２５と海底９との隙間を容易に埋めることができる。このため、海底９が不陸な場所であっても、取水プール１内の海水が防波板２５の下方から取水プール１外へ流出することがない。   Thus, according to the present embodiment, the submerged dike 7 can be easily constructed so as to surround the water intake 3 of the power plant. In particular, a bag body 27 is provided below the wave breaker plate 25 constituting the submerged dam 7, and the bag body 27 is filled with a mortar 31, thereby easily filling the gap between the wave breaker plate 25 and the seabed 9. it can. For this reason, even if the seabed 9 is an unlanded place, the seawater in the intake pool 1 does not flow out of the intake pool 1 from below the wave breaker 25.

また、取水プール１を構築するのが潜堤７であり、海面５よりも低い位置であるため、海面近傍において波が生じた場合においても、潜堤７の前面および背面の水位変化がほぼ同時となり、このため、潜堤７に生じる波力の影響に対して有利である。   In addition, since the intake pool 1 is constructed by the submerged dike 7 and is lower than the sea level 5, even when a wave is generated in the vicinity of the sea surface, the water level changes on the front and back surfaces of the submerged dike 7 are almost simultaneous. Therefore, it is advantageous against the influence of the wave force generated in the submerged levee 7.

また、ケーシング１５を用いて杭１９を設置するため、潜堤７の施工時に汚濁成分が取水口３へ大量に流入することがない。   Moreover, since the pile 19 is installed using the casing 15, a large amount of pollutant components do not flow into the water intake 3 when the submerged levee 7 is constructed.

次に、第２の実施の形態について説明する。なお、以下の実施の形態において、図１から図８に示す潜堤７等と同一の機能を果たす構成要素には、図１から図８と同一番号を付し、重複した説明を避ける。   Next, a second embodiment will be described. In the following embodiments, components having the same functions as those of the submerged dike 7 shown in FIGS. 1 to 8 are denoted by the same reference numerals as those in FIGS. 1 to 8 to avoid redundant description.

図９は第２の実施形態を示す図であり、図９（ａ）は複数の杭１９が設置された正面図であり、図９（ｂ）、図９（ｃ）は、図９（ａ）のＦ−Ｆ線矢視方向から見た防波板２５の設置状態を示す図である。第２の実施の形態は、第１の実施の形態における袋体２７に代えてラス網３３が用いられる。遮水手段であるラス網３３は袋状であり、海面５上に通ずるホース２９が接続されている。   FIG. 9 is a diagram showing the second embodiment, FIG. 9A is a front view in which a plurality of piles 19 are installed, and FIG. 9B and FIG. 9C are FIG. It is a figure which shows the installation state of the wave-breaking board 25 seen from the FF line arrow direction of). In the second embodiment, a lath net 33 is used instead of the bag body 27 in the first embodiment. The lath net 33 serving as a water shielding means has a bag shape and is connected to a hose 29 leading to the sea surface 5.

図９（ｂ）に示すように、下部にラス網３３が設けられる防波板２５が、ラス網３３およびホース２９とともに下方へ降ろされる（図中矢印Ｅ方向）。   As shown in FIG. 9B, the wave preventing plate 25 provided with the lath net 33 at the lower part is lowered together with the lath net 33 and the hose 29 (in the direction of arrow E in the figure).

防波板２５（ラス網３３）が海底９上に降ろされた後（図中矢印Ｅ方向）、図９（ｃ）に示すように、ホース２９を用いて、ラス網３３内へ充填材である骨材入りのコンクリート３５を充填する。ラス網３３は、内部にコンクリート３５が充填されるため、防波板２５および海底９に応じて変形する。したがって、ラス網３３は防波板２５および海底９へ密着する。すなわち、海底９が不陸であっても、海底９の形状に応じてラス網３３が変形するため、ラス網３３は海底９と防波板２５との隙間を確実に埋めることができる。   After the wave breaker plate 25 (lass net 33) is lowered onto the seabed 9 (in the direction of arrow E in the figure), as shown in FIG. 9C, the hose 29 is used to fill the lath net 33 with a filler. Fill with some aggregated concrete 35. Since the lath net 33 is filled with the concrete 35 inside, the lath net 33 is deformed according to the wave preventing plate 25 and the seabed 9. Accordingly, the lath net 33 is in close contact with the wave preventing plate 25 and the seabed 9. That is, even if the seabed 9 is uneven, the lath net 33 is deformed according to the shape of the seabed 9, so that the lath net 33 can reliably fill the gap between the seabed 9 and the wave breaker 25.

次に、第３の実施の形態について説明する。図１０は第３の実施形態を示す図であり、図１０（ａ）は複数の杭１９が設置された正面図であり、図１０（ｂ）、図１０（ｃ）は、図１０（ａ）のＦ−Ｆ線矢視方向から見た防波板２５の設置状態を示す図であり、図１０（ｄ）は図１０（ｃ）の下方（点線部）の矢視Ｇ方向から見た図である。第３の実施の形態は、第１の実施の形態における袋体２７に代えて型枠３７が用いられる。遮水手段である型枠３７は板状であり、防波板２５下端縁部の両面に設けられている。一対の型枠３７で囲まれた部位には海面５上に通ずるホース２９が接続されている。   Next, a third embodiment will be described. FIG. 10 is a diagram showing a third embodiment, FIG. 10 (a) is a front view in which a plurality of piles 19 are installed, and FIG. 10 (b) and FIG. 10 (c) are FIG. ) Of FIG. 10 is a diagram showing the installation state of the wave preventing plate 25 as viewed from the direction of arrows F-F, and FIG. 10D is viewed from the direction of arrows G in the lower part (dotted line part) of FIG. FIG. In the third embodiment, a mold 37 is used instead of the bag body 27 in the first embodiment. The mold 37 which is a water shielding means has a plate shape, and is provided on both surfaces of the bottom edge of the wave preventing plate 25. A hose 29 leading to the sea surface 5 is connected to a portion surrounded by the pair of molds 37.

防波板２５（型枠３７）が海底９上に降ろされた後（図中矢印Ｅ方向）、図１０（ｃ）および図１０（ｄ）に示すように、型枠３７と海底９との隙間を埋めるように隙間塞ぎ部材である土のう３９が設置される。なお、図１０（ｄ）は、土のう３９を透視した状態を示す図である。次に、ホース２９を用いて、型枠３７内へ充填材である骨材入りのコンクリート３５を充填する。すなわち、防波板２５下方の、型枠３７および土のう３９で囲まれた内部にコンクリート３５が充填される。   After the wave preventing plate 25 (form 37) is lowered onto the seabed 9 (in the direction of arrow E in the figure), as shown in FIGS. 10 (c) and 10 (d), the mold 37 and the seabed 9 A sandbag 39, which is a gap closing member, is installed so as to fill the gap. In addition, FIG.10 (d) is a figure which shows the state which saw through the sandbag 39. FIG. Next, the hose 29 is used to fill the formwork 37 with aggregated concrete 35 as a filler. That is, the concrete 35 is filled in the interior surrounded by the mold 37 and the sandbag 39 below the wave preventing plate 25.

コンクリート３５が固まった後、土のう３９および型枠３７が撤去される。なお、型枠３７はコンクリート３５とともに残してもよい。このように、海底９が不陸であっても、型枠３７および土のう３９内部に充填されたコンクリート３５によって、海底９と防波板２５との隙間を確実に埋めることができる。   After the concrete 35 has hardened, the sandbag 39 and the formwork 37 are removed. The mold 37 may be left together with the concrete 35. In this way, even when the seabed 9 is uneven, the gap between the seabed 9 and the wave preventing plate 25 can be reliably filled with the concrete 35 filled in the mold 37 and the sandbag 39.

次に、第４の実施の形態について説明する。図１１は第４の実施形態を示す図であり、図１１（ａ）は複数の杭１９が設置された正面図であり、図１１（ｂ）、図１１（ｃ）は、図１１（ａ）のＦ−Ｆ線矢視方向から見た防波板２５の設置状態を示す図である。第４の実施の形態は、第１の実施の形態における袋体２７に代えてゴムプレート４１が用いられる。遮水手段であるゴムプレート４１は、防波板２５下端縁部に設けられている。   Next, a fourth embodiment will be described. FIG. 11 is a diagram showing a fourth embodiment, FIG. 11 (a) is a front view in which a plurality of piles 19 are installed, and FIGS. 11 (b) and 11 (c) are FIG. 11 (a). It is a figure which shows the installation state of the wave-breaking board 25 seen from the FF line arrow direction of). In the fourth embodiment, a rubber plate 41 is used instead of the bag body 27 in the first embodiment. The rubber plate 41 as a water shielding means is provided at the lower end edge of the wave preventing plate 25.

防波板２５（ゴムプレート４１）が海底９上に降ろされると（図中矢印Ｅ方向）、図１１（ｃ）に示すように、ゴムプレート４１が海底９と接触する。ゴムプレート４１は、容易に変形可能であるため、海底９の形状に応じて変形して防波板２５と海底９との間の隙間を埋めることができる。したがって、海底９が不陸であっても、ゴムプレート４１の変形によって、海底９と防波板２５との隙間を確実に埋めることができる。   When the wave preventing plate 25 (rubber plate 41) is lowered onto the seabed 9 (in the direction of arrow E in the figure), the rubber plate 41 comes into contact with the seabed 9 as shown in FIG. Since the rubber plate 41 can be easily deformed, it can be deformed according to the shape of the seabed 9 to fill the gap between the wave preventing plate 25 and the seabed 9. Therefore, even if the seabed 9 is uneven, the gap between the seabed 9 and the wave preventing plate 25 can be filled reliably by the deformation of the rubber plate 41.

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。   As mentioned above, although embodiment of this invention was described referring an accompanying drawing, the technical scope of this invention is not influenced by embodiment mentioned above. It is obvious for those skilled in the art that various modifications or modifications can be conceived within the scope of the technical idea described in the claims, and these are naturally within the technical scope of the present invention. It is understood that it belongs.

たとえば、遮水手段である袋体２７、ラス網３３、型枠３７、ゴムプレート４１の大きさや形態は、図示した例に限られない。防波板２５と海底９との隙間を確実に埋めることができれば、その形態は限られない。   For example, the size and form of the bag body 27, the lath net 33, the mold 37, and the rubber plate 41, which are water shielding means, are not limited to the illustrated example. The form will not be restricted if the clearance gap between the wave-proof board 25 and the seabed 9 can be filled reliably.

１………取水プール
２………原子力発電所
３………取水口
５………海面
７………潜堤
９………海底
１１………遮水部
１５………ケーシング
１６………施工領域
１７………掘削部
１９………杭
２１………モルタル
２３………排水管
２５………防波板
２７………袋体
２９………ホース
３１………モルタル
３３………ラス網
３５………コンクリート
３７………型枠
３９………土のう
４１………ゴムプレート 1 ……… Intake pool 2 ……… Nuclear power station 3 ……… Intake 5 ……… Sea surface 7 ……… Submarine 9 ……… Submarine 11 ……… Water-impervious section 15 ……… Case 16 …… ... Construction area 17 ......... Excavation part 19 ......... Pile 21 ......... Mortar 23 ......... Drainage pipe 25 ......... Wave breaker 27 ......... Bag 29 ... …… Hose 31 ......... Mortar 33 ... ...... Las net 35 ......... Concrete 37 ......... Formwork 39 ......... Dough 41 ... …… Rubber plate

Claims (8)

水底地盤をケーシングを用いて掘削し、防波板保持部を有する杭を設置する工程（ａ）と、
所定の間隔をあけて設けられた前記杭の間に、下部に遮水手段を有する防波板を、前記防波板保持部を用いて設置する工程（ｂ）と、
前記防波板と水底との隙間を、前記遮水手段を用いて塞ぐ工程（ｃ）と、
を具備することを特徴とする水中構造物の施工方法。 A step (a) of excavating the bottom ground using a casing and installing a pile having a wave-breaking plate holding portion;
A step (b) of installing a wave-breaking plate having a water-shielding means at a lower portion between the piles provided at a predetermined interval using the wave-breaking plate holding unit;
A step (c) of closing a gap between the wave breaker plate and the water bottom using the water shielding means;
The construction method of the underwater structure characterized by comprising. 前記工程（ｃ）は、前記遮水手段へ通ずる管体を用い、水上より前記遮水手段へ充填材を充填して前記防波板と水底との隙間を塞ぐことを特徴とする請求項１記載の水中構造物の施工方法。   The step (c) uses a pipe that communicates with the water shielding means, and fills the water shielding means with a filler from above the water to close the gap between the wave breaker plate and the water bottom. The construction method of the described underwater structure. 前記遮水手段は、前記防波板下部に設けられた袋状部材であり、前記管体は前記袋状部材に通じており、前記工程（ｃ）は、前記袋状部材へ水上より充填材を充填し、前記袋状部材が膨れることで、前記防波板と水底との隙間を塞ぐことを特徴とする請求項２に記載の水中構造物の施工方法。   The water shielding means is a bag-like member provided at the lower part of the wave-proof plate, the tubular body communicates with the bag-like member, and the step (c) is performed by filling the bag-like member from above with water. The construction method of the underwater structure according to claim 2, wherein the bag-shaped member swells to close a gap between the wave preventing plate and the water bottom. 前記遮水手段は、前記防波板下部に設けられた袋状のラス網であり、前記管体は前記ラス網内に通じており、前記工程（ｃ）は、前記ラス網が水底の形状に応じて変形し、前記ラス網で囲まれた部位に水上より充填材を充填し、前記防波板と水底との隙間を塞ぐことを特徴とする請求項２に記載の水中構造物の施工方法。   The water shielding means is a bag-shaped lath net provided at the lower part of the wave-breaking plate, the tube communicates with the lath net, and in the step (c), the lath net is shaped like a water bottom. 3. The construction of the underwater structure according to claim 2, wherein the portion surrounded by the lath net is filled with a filler from above to close a gap between the wave preventing plate and the bottom of the water. Method. 前記遮水手段は、前記防波板下部に設けられた型枠であり、前記管体は前記型枠内に通じており、前記工程（ｃ）は、水底の形状に応じて変形可能な隙間塞ぎ部材を前記防波板と水底との隙間を埋めるように配置し、前記型枠および前記隙間塞ぎ部材とで囲まれた部位に水上より充填材を充填し、前記防波板と水底との隙間を塞ぐことを特徴とする請求項２に記載の水中構造物の施工方法。   The water shielding means is a mold provided at a lower part of the wave preventing plate, the tubular body communicates with the mold, and the step (c) is a gap that can be deformed according to the shape of the water bottom. A closing member is disposed so as to fill a gap between the wave preventing plate and the bottom of the water, and a portion surrounded by the mold and the gap closing member is filled with a filler from above the water. The construction method for an underwater structure according to claim 2, wherein the gap is closed. 前記遮水手段は、前記防波板下部に設けられたゴム部材であり、前記工程（ｃ）は、前記ゴム部材が水底の形状に応じて変形することにより、前記防波板と水底との隙間を塞ぐことを特徴とする請求項１記載の水中構造物の施工方法。   The water shielding means is a rubber member provided at a lower part of the wave preventing plate, and the step (c) includes the step of deforming the rubber member according to the shape of the water bottom, thereby The construction method for an underwater structure according to claim 1, wherein the gap is closed. 設置された前記杭の高さは水面よりも低く、杭頭が水中に没した状態であることを特徴とする請求項１から請求項６のいずれかに記載の水中構造物の施工方法。   The method for constructing an underwater structure according to any one of claims 1 to 6, wherein the installed pile has a height lower than the water surface and the pile head is submerged in water. 前記水中構造物は発電所の取水プールを構成し、
前記杭および前記防波板を発電所の取水口を囲むように設けることを特徴とする請求項１から請求項７のいずれかに記載の水中構造物の施工方法。 The underwater structure constitutes a water intake pool of the power plant,
The construction method for an underwater structure according to any one of claims 1 to 7, wherein the pile and the wave breaker are provided so as to surround a water intake of a power plant.
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