JP2017075469A - Collection device for water bottom flowing methane gas and collection method for the same - Google Patents

Collection device for water bottom flowing methane gas and collection method for the same Download PDF

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JP2017075469A
JP2017075469A JP2015202612A JP2015202612A JP2017075469A JP 2017075469 A JP2017075469 A JP 2017075469A JP 2015202612 A JP2015202612 A JP 2015202612A JP 2015202612 A JP2015202612 A JP 2015202612A JP 2017075469 A JP2017075469 A JP 2017075469A
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信 成井
Makoto Narui
信 成井
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PROBLEM TO BE SOLVED: To collect a large amount of water bottom flowing methane gas at a time by covering water bottom flowing methane gas jets over a wide range at low cost.SOLUTION: A collection device for water bottom flowing methane gas collection is characterized in that: a column 11 is stood on a water bottom surface, the column 11 penetrates an upper end part of a collection container A in an inverted cup shape, and an upper end of the collection container is fixed to the column 11 at a fixed height position; the collection container A has a cylindrical peripheral wall part 1, an upper end of which is closed with a top end shield part 2 whose upper side is tapered; the peripheral wall part 1 is formed of a foldable water-impermeable film material, and a weight 30 to be sunk in a water bottom surface is coupled to a lower end; and the top end shield part 2 of the collection container A is fixed to the column 11, and the peripheral wall part 1 in a folded state is extended with the weight 30 sunk in the water bottom so as to form a water bottom flowing methane gas collection space inside.SELECTED DRAWING: Figure 1

Description

本発明は水底面から自噴している水底自噴メタンガスを捕集する水底自噴メタンガス捕集装置及び同捕集方法に関する。   The present invention relates to a water bottom self-injecting methane gas collecting device and a method for collecting the water bottom self-injecting methane gas that is self-injecting from the bottom of the water.

近年、水底地盤の表層や地盤内に存在しているメタンハイドレート（Ｍethane hydrate）からの水底自噴メタンガスの採取技術の開発がなされている。   2. Description of the Related Art In recent years, a technique for collecting submerged self-injected methane gas from methane hydrate (Methane hydrate) existing on the surface of the submarine ground or in the ground has been developed.

メタンハイドレートは、水分子に閉じ込められた水底自噴メタンガスが、海底地盤表面や地盤中の各種の深さで条件が揃うと水と共に凍り、氷塊となって存在するものであり、このメタンハイドレートの安定条件、即ち安定化を維持するための温度及び圧力の条件を崩すことによって氷塊から水底自噴メタンガスを分離して取り出すことができる。   Methane hydrate is a submerged self-exploding methane gas confined in water molecules that freezes with water and exists as ice blocks when conditions are met at various depths in the surface of the seabed and in the ground. The bottom self-injected methane gas can be separated and extracted from the ice block by breaking the stable conditions, that is, the temperature and pressure conditions for maintaining the stabilization.

しかし、３００ｍ〜１０００ｍもの深さの水底面を掘削し、水底地盤表面や地盤内の深さ１０００ｍもの深さに存在するメタンハイドレートを不安定化させる水底自噴メタンガスの採掘は、他の化石燃料の代替とするには採掘コストがかかり過ぎ、実現化が困難な状況となっている。   However, excavation of the bottom surface of 300m to 1000m depth, and the extraction of submerged self-injected methane gas that destabilizes methane hydrate existing at the depth of the bottom surface and the depth of 1000m in the ground, is another fossil fuel. To replace it, it takes too much mining cost and is difficult to realize.

また、メタンハイドレートの埋蔵個所には、水底の地表から水底自噴メタンガスが噴出し、高さ数百ｍにも達する水底自噴メタンガス気泡の上昇柱（メタンプルーム）が発生していることが知られている。   In addition, it is known that the bottom of the methane hydrate deposits (methane plume) of submerged self-injected methane gas bubbles that reach several hundred meters in height are ejected from the bottom surface. ing.

このような、海底から噴出する水底自噴メタンガスは、気泡のまま上昇する場合の他に、水底地盤表面から噴出し、水底の水と接触することにより、気泡の表面にガスハイドレートの被膜ができ、被膜付粒となって上昇し、一定の深度（水深２３０ｍ付近）に達すると温度の上昇や水圧の低下によってガスハイドレートの安定条件から脱した状態に至り被膜が破裂し、皮膜で保護された気泡は消失し、ガスは海水に溶解することが知られている（例えば非特許文献１）。   In addition to the case where the bottom self-injecting methane gas ejected from the seabed rises in the form of bubbles, it erupts from the surface of the bottom and comes into contact with the water at the bottom of the bottom, thereby forming a gas hydrate coating on the surface of the bubbles When it reaches a certain depth (around 230m in depth), it rises from the stable condition of gas hydrate due to an increase in temperature or a decrease in water pressure, and the film bursts and is protected by the film. It is known that the bubbles disappear and the gas dissolves in seawater (for example, Non-Patent Document 1).

従来、メタンプルームの被膜付粒を水底面付近で捕集し、パイプを通して水面上の船舶に導き、ガスタンクに注入するようにした水底自噴メタンガスの採取方法が開発されている。この技術には、水面上の作業船より剛性のあるパイプを順次連結しながら垂下させ、その先端に傘状の捕捉器を固定しておき、これを水底自噴メタンガス噴出口上に位置させ、捕捉器内に上昇してくる水底自噴メタンガスを捕捉し、パイプを通して作業船上に導き、所定の加圧タンク内に加圧注入しようとするもの（特許文献１）がある。   Conventionally, a method has been developed for collecting self-injecting methane gas from the bottom that collects methane plume-coated granules near the bottom of the water, guides them through a pipe to a ship on the water, and injects them into a gas tank. In this technology, a rigid pipe is suspended from a work boat on the surface of the water while being connected in sequence, and an umbrella-shaped trap is fixed to the tip of the pipe, and this is positioned on the bottom self-injecting methane gas outlet and trapped. There is an apparatus (Patent Document 1) that captures the bottom self-injecting methane gas rising into the vessel, guides it to a work ship through a pipe, and pressurizes it into a predetermined pressurized tank.

また、メタンハイドレートからの水底自噴メタンガスを捕集するものとして、ドーム状のシートで水底表層のメタンハイドレートを覆い、その中に温水を供給することによって氷塊状のメタンハイドレートを不安定化させ、これによって発生する水底自噴メタンガスをドーム状のシート内に捕集し、これを水上へ輸送管を通して送り出すようにしたもの（特許文献２）がある。   In addition, methane hydrate on the bottom of the bottom is covered with a dome-shaped sheet, and hot water is supplied into the methane hydrate in order to collect methane hydrate from the methane hydrate. The bottom self-injecting methane gas generated thereby is collected in a dome-shaped sheet, and is sent out to the water through a transport pipe (Patent Document 2).

上述した特許文献１に示されているメタンプルームからのガス捕集技術では、水面上の作業船から水底面の水底自噴メタンガスが噴出している個所まで剛性のある鋼管を垂下する必要があり、しかもガス捕集中においても捕捉器を、水上の船舶から鋼管を通じてガス自噴口上に保持させなければならない。しかし、通常メタンプルームの水深は３００ｍから１０００ｍ以上もの深さにあるため、捕集容器を予定の位置まで到達させ、しかもその位置で停止させて置く作業に困難を伴う。   In the gas collection technology from the methane plume shown in Patent Document 1 described above, it is necessary to hang down a rigid steel pipe from the work ship on the water surface to the location where the water bottom self-injecting methane gas is ejected on the water surface, Moreover, even in gas concentration, the trap must be held on the gas injection port through a steel pipe from a ship on the water. However, since the water depth of the methane plume is usually from 300 m to 1000 m or more, it is difficult to move the collection container to a predetermined position and stop and place it at that position.

近年においては、水底面上の一定の位置に船舶を停止させ、数千ｍの海底地盤に数千ｍものボーリングを行う技術や数千ｍもの水底で作業を行う無人の潜水艇が開発されているが、これらは極めて高精度で高性能の技術を結集したものであり、その使用コストが多大となり、メタンプルームからのガス採取に使用するのでは、捕集した水底自噴メタンガスが既存の化石燃料に比べて高価なものとなり、採算が取れないという問題がある。   In recent years, a technology has been developed that stops a ship at a certain position on the bottom of the water, drills thousands of meters on the seabed of thousands of meters, and unmanned submersibles that work on the bottom of thousands of meters. However, these are a collection of extremely high-precision and high-performance technologies, and the cost of using them is enormous, and if they are used for gas extraction from a methane plume, the collected submarine self-injected methane gas is used as an existing fossil fuel. There is a problem that it becomes expensive compared to, and is not profitable.

また、特許文献２に示されている方法は、水底のメタンハイドレートの表面をシートで覆いその中に温水を供給することによって水底自噴メタンガスを氷塊から分離させ、これをドーム状のシート内に捕集しようとするものであり、自噴しているメタンハイドレートからの水底自噴メタンガス捕集に使用するには、自噴ガスの状態や、海流の状況によって設置が困難となる場合が多いという問題がある。   Further, the method disclosed in Patent Document 2 covers the surface of the methane hydrate on the bottom with a sheet and supplies hot water therein to separate the bottom self-injected methane gas from the ice block, which is then placed in a dome-shaped sheet. There is a problem that installation is often difficult due to the state of the self-injected gas and the state of the ocean current in order to collect it, and to use it for submerged self-injected methane gas from the self-injecting methane hydrate. is there.

このような従来の問題を解決するものとして、本発明者は先に、下端が解放され上端が閉じられた逆さカップ状の捕集容器を使用し、該捕集容器には、内部の空気容積を変化させることによって浮力を調整するようにした浮力調用空洞部を有する浮力調整装置と、捕集容器を水平移動させる推進装置とを備えておき、浮力調用空洞部内への注排水によって浮力を調整しつつ推進装置を作動させて捕集容器を所定の沈設位置に沈め自噴水底自噴メタンガスを内部に取り込み捕集ガス導出用パイプを通じて船上に導出させるようにした装置を提案した（特許文献３）。   In order to solve such a conventional problem, the present inventor first used an inverted cup-shaped collection container whose lower end is opened and whose upper end is closed, and the collection container has an internal air volume. The buoyancy adjustment device has a buoyancy adjustment cavity that adjusts the buoyancy by changing the buoyancy, and a propulsion device that horizontally moves the collection container, and the buoyancy is adjusted by pouring water into the buoyancy adjustment cavity. Meanwhile, a device was proposed in which the propulsion device was operated to sink the collection vessel to a predetermined settling position, and the self-fountain bottom self-injected methane gas was taken into the vessel and led out to the ship through the collected gas extraction pipe (Patent Document 3).

特開２０１４−２０１８７５号公報JP 2014-201875 A 特開２０００−２８２７７５号公報JP 2000-282775 A 特許第５７７１７６２号公報Japanese Patent No. 5771762

地學雑誌 ９００９ＶＯＬ．１１８ 東京地学協会発行Geographical magazine 9009VOL. 118 Published by Tokyo Geographical Society

上述した特許文献３に示されている水底自噴メタンガス捕集方法及び装置では、浮力調整装置と推進装置の操作によって捕集容器を固定して所定位置に降下させるものであるため、潮流がある場所においても高度な操船技術を要することなく捕集容器のみを所定の位置に沈設することができる利点があるが、鋼製の捕集容器をドックなどで建造し、沈設位置に搬送させるものであるため、そのおおきさに限界があり、広範な位置に分布している水底自噴メタンガス噴出口を広く覆うこととすると、製造コスト、沈設コストが高くなるという問題がある。   In the water bottom self-injecting methane gas collection method and apparatus shown in Patent Document 3 described above, the collection container is fixed and lowered to a predetermined position by the operation of the buoyancy adjustment device and the propulsion device. However, there is an advantage that only the collection container can be sunk at a predetermined position without requiring advanced marine maneuvering technology, but the steel collection container is constructed with a dock or the like and transported to the sunk position. For this reason, there is a limit to its large size, and if the water bottom self-injecting methane gas outlets distributed over a wide range are covered widely, there is a problem that the manufacturing cost and the installation cost increase.

本発明はこのような問題に鑑み、従来に比べて低廉なコストで、水底自噴メタンガス噴出口を広範囲に覆い、同時に多量の水底自噴メタンガスを捕集することができる水底自噴メタンガス捕集装置及び同捕集方法の提供を目的としてなされたものである。   In view of such problems, the present invention covers a water bottom self-injecting methane gas outlet in a wide range at a lower cost than the conventional one, and simultaneously collects a large amount of water bottom self-injecting methane gas. It was made for the purpose of providing a collection method.

上述した従来の問題を解決するための本発明の第１の特徴は、水底自噴メタンガスが自噴している水底のメタンガス噴出口を覆うための下側が解放した逆さカップ状の捕集容器を有し、該捕集容器内に噴出した水底自噴メタンガスを、該捕集容器の上端部内開口させた捕集容器内捕集ガス導出口より捕集ガス導出用通路を通して船上に導出するようにした水底自噴メタンガス捕集装置において、水底面上に立設した支柱を備え、前記捕集容器の上端部に前記支柱を貫通させ、該支柱の所定高さ位置に該捕集容器の上端を固定させ、前記捕集容器は、筒状をした周壁部を有し、該周壁部の上端を上側が先細りのテーパ状をした天端遮蔽部にて閉鎖させ、前記周壁部は、折り畳み可能な不透水性の膜材をもって形成されているとともに、該周壁部の下端に水底面に沈設される錘が連結されており、前記支柱に対して前記捕集容器の天端遮蔽部を固定し、前記錘を水底に沈設させた状態で前記周壁部が折り畳まれた状態から伸長されて、内部に水底自噴メタンガス捕集空間が形成されるようにしたことにある   The first feature of the present invention for solving the above-described conventional problem is that the bottom-side self-injecting methane gas self-injects the bottom-side methane gas outlet and has an inverted cup-shaped collection container opened at the lower side. The bottom self-ejecting methane gas spouted into the collection vessel is led out to the ship through the collection gas extraction passage from the collection gas extraction port in the collection vessel opened in the upper end of the collection vessel. In the methane gas collection device, the column is provided with a support column erected on the bottom of the water, and the support column is passed through the upper end of the collection vessel, and the upper end of the collection vessel is fixed at a predetermined height position of the support column, The collection container has a cylindrical peripheral wall portion, the upper end of the peripheral wall portion is closed by a top-end shielding portion having a tapered upper side, and the peripheral wall portion is permeable and impermeable. The peripheral wall portion is formed with a film material. A weight sinked on the bottom of the water is connected to the lower end, the top end shielding part of the collection container is fixed to the support column, and the peripheral wall part is folded with the weight set on the bottom of the water. It was extended from the state, and the bottom self-injection methane gas collection space was formed inside

本発明の第２の特徴は、上記第１の特徴に加え、支柱は、中空の筒状材が使用され、その下端を水底地盤に嵌入させて立設させ、前記捕集容器の天端遮蔽部を固定した高さより下側に前記中空筒状の内外に貫通開口させた捕集容器内捕集ガス導出口が形成され、該捕集容器内に捕集されて上昇する水底自噴メタンガスを、前記支柱内を捕集ガス導出用通路として導出させるようにしたことにある。   According to a second feature of the present invention, in addition to the first feature, a hollow cylindrical material is used for the support column, and a lower end of the support column is fitted into the water bottom ground so that the top end of the collection container is shielded. The collection gas outlet in the collection container that is opened through the hollow cylindrical inside and outside below the height at which the portion is fixed is formed, and the bottom self-injected methane gas that is collected and rises in the collection container, The inside of the column is led out as a collected gas lead-out passage.

本発明の第３の特徴は上記第１、第２の特徴に加え、支柱の外周にはフランジ状に張り出させた捕集容器上端固定部が一体に備えられ、前記捕集容器の天端遮蔽部の中央には、前記支柱外に嵌め合わされて上下にスライド可能な対支柱固定部兼用のガイド部材が備えられ、該ガイド部材と前記捕集容器上端固定部には、前記ガイド部材が降下して捕集容器上端固定部に当接することによって両者間を離脱不能に連結する継手機構が備えられていることにある。   According to a third feature of the present invention, in addition to the first and second features described above, a collection container upper end fixing portion that is projected in a flange shape is integrally provided on the outer periphery of the support column, and the top end of the collection container. At the center of the shielding part, a guide member is also provided that is fitted to the outside of the support column and can be slid up and down. The guide member and the collection container upper end fixing part are lowered by the guide member. In addition, a joint mechanism is provided to connect the two together so that they cannot be detached by contacting the upper end fixing portion of the collection container.

本発明の第４の特徴は上記第１〜第３の特徴の何れか１に加え、捕集容器の周壁部は、水平断面が円形に形成され、所定高さ間隔毎に該円形に沿った配置に補強兼用の保形部材を備え、上下に隣り合う該円形保形部材間の前記膜材が上下に折りたたまれることによって蛇腹状が形成されていることにある。   In addition to any one of the first to third features described above, the fourth feature of the present invention is that the peripheral wall portion of the collection container is formed in a circular shape in a horizontal cross section, and is arranged along the circle at every predetermined height interval. An arrangement is provided with a shape-retaining member that also serves as a reinforcement, and a bellows shape is formed by folding the film material between the circular shape-retaining members adjacent to each other vertically.

本発明の第５の特徴は、筒状をした周壁部と、該周壁部の上端を閉鎖させた上側が先細りのテーパ状をした天端遮蔽部とを有し、該天端遮蔽部に対支柱固定部兼用のガイド部材が固定され、かつ前記周壁部が上下に折り畳み可能に形成された捕集容器を形成しておき、前記捕集容器の周壁部の下端に沈設用の錘を固定し該周壁部を上下に畳んだ状態を維持させておくとともに、水面上より支柱を垂加させて所望の水底地盤内に該支柱の下端を貫入させて自立させ、該支柱の上端を前記捕集容器の天端遮蔽部の対支柱固定部兼用のガイド部材内に貫通させた状態で前記錘の重量を利用して該捕集容器を支柱に沿って沈降させ、前記支柱の所定の高さ位置に予め固定しておいた捕集容器上端固定部に前記対支柱固定部兼用のガイド部材が当接した状態で、前記錘が更に沈降して水底面に沈設されることにより周壁部を上下に伸長させて内部に水底自噴メタンガス捕集空間を形成させ、該水底自噴メタンガス捕集空間の下端より上昇する水底自噴メタンガスを、該水底自噴メタンガス捕集空間の上端部内に連通させた捕集ガス導出用通路を通して水面上に導出させる水底自噴メタンガス捕集方法にある。   According to a fifth aspect of the present invention, there is provided a cylindrical peripheral wall portion, and a top end shielding portion having a tapered shape with a taper on the upper side where the upper end of the peripheral wall portion is closed. A collection container is formed in which a guide member that also serves as a column fixing part is fixed and the peripheral wall part is foldable up and down, and a sinking weight is fixed to the lower end of the peripheral wall part of the collection container. While maintaining the state where the peripheral wall portion is folded up and down, the column is suspended from above the water surface so that the lower end of the column penetrates into the desired water bottom ground, and the upper end of the column is collected. Using the weight of the weight in a state of being penetrated into the guide member that also serves as a counter column fixing part of the top end shielding part of the container, the collection container is allowed to settle along the column, and a predetermined height position of the column The guide member that is also used as the counter strut fixing portion is in contact with the upper end fixing portion of the collection container that has been fixed in advance. In this state, the weight further sinks and is set on the bottom surface of the water, thereby extending the peripheral wall portion up and down to form a bottom self-injection methane gas collection space and rising from the lower end of the bottom bottom self-injection methane gas collection space. In the method of collecting water bottom self-injecting methane gas, the water bottom self-injecting methane gas is led out to the surface of the water through a collection gas deriving passage communicating with the upper end of the water bottom self-injecting methane gas collection space.

本発明の第６の特徴は上記第５の特徴に加え、捕集容器は、その周壁部下端の錘を水面上に浮かべた浮体に吊り下げた状態で水面下に吊り下げ、これを曳航して前記水底地盤上に立設した支柱の上端上に移動させ、前記錘をクレーン船によって支持させた状態で浮体から切り離し、前記天端遮蔽部の捕集容器上端固定部を前記支柱に嵌合させた状態で前記錘とともに捕集容器を沈降させることにある。   The sixth feature of the present invention is that, in addition to the fifth feature, the collection container is suspended below the surface of the water in a state where the weight at the lower end of the peripheral wall is suspended on a floating body floating on the surface of the water. The top end of the column placed on the bottom floor is moved to the upper end of the column, and the weight is separated from the floating body while being supported by a crane ship. In this state, the collection container is allowed to settle together with the weight.

本発明は、上記第１の特徴のように、水底面上に立設した支柱を備え、前記捕集容器の上端部に前記支柱を貫通させ、該支柱の所定高さ位置に該捕集容器の上端を固定させ、前記捕集容器は、筒状をした周壁部を有し、該周壁部の上端を上側が先細りのテーパ状をした天端遮蔽部にて閉鎖させ、前記周壁部は、折り畳み可能な不透水性の膜材をもって形成されているとともに、該周壁部の下端に水底面に沈設される錘が連結されており、前記支柱に対して前記捕集容器の天端遮蔽部を固定し、前記錘を水底に沈設させた状態で前記周壁部が折り畳まれた状態から伸長されて、内部に水底自噴メタンガス捕集空間が形成されるようにしたことにより、従来の逆さカップ状をした捕集容器を使用するものに比べ、水底自噴メタンガスの噴出域をより広範囲に覆う捕集容器が、低コストで製造でき、捕集容器の設置に際し、予め支柱を立設して置くことで、所定の位置に正確に容易に沈めることができ、水底自噴メタンガスの捕集のための水底設備の構築費を低くすることができる。   As described in the first feature, the present invention includes a support column erected on the bottom surface of the water, and passes the support column through an upper end portion of the collection container, and the collection container at a predetermined height position of the support column. The upper end of the collection container has a cylindrical peripheral wall portion, and the upper end of the peripheral wall portion is closed by a top end shielding portion having a tapered shape on the upper side. It is formed with a foldable impermeable membrane material, and a weight sinked on the bottom of the water is connected to the lower end of the peripheral wall portion, and the top end shielding portion of the collection container is connected to the support column. By fixing and extending the peripheral wall portion in a state where the weight is sunk in the bottom of the water, a water bottom self-injecting methane gas collection space is formed inside, so that a conventional inverted cup shape is formed. Compared to the one using the collected collection container A collection container that covers a wide area can be manufactured at low cost, and when the collection container is installed, it is possible to submerge the bottom self-injected methane gas accurately and easily by placing it upright in advance. It is possible to reduce the construction cost of the water bottom facilities for collecting.

本発明は上記第２の特徴のように、支柱は、中空の筒状材が使用され、その下端を水底地盤に嵌入させて立設させ、前記捕集容器の天端遮蔽部を固定した高さより下側に前記中空筒状の内外に貫通開口させた捕集容器内捕集ガス導出口が形成され、該捕集容器内に捕集されて上昇する水底自噴メタンガスを、前記支柱内を捕集ガス導出用通路として導出させるようにしたことにより、捕集容器を支持し、且つ沈設ガイドとなる支柱が、捕集ガス導出用通路をも兼用することとなり、設備が構造が簡略化され、水底自噴メタンガス捕集装置全体の設置コストを削減できる。   In the present invention, as in the second feature, a hollow cylindrical material is used for the support column, and the lower end of the support column is fitted into the water bottom ground to be erected, and the top end shielding portion of the collection container is fixed. A collection gas outlet in the collection vessel is formed below and through the hollow cylindrical inside and outside, and the bottom self-injected methane gas collected in the collection vessel and rising is collected in the column. By making it lead out as the gas collection lead-out passage, the column that supports the collection container and serves as the settling guide also serves as the collection gas lead-out passage, and the structure of the equipment is simplified. The installation cost of the entire bottom self-injection methane gas collector can be reduced.

本発明は、上記の第３の特徴のように、支柱の外周にはフランジ状に張り出させた捕集容器上端固定部が一体に備えられ、前記捕集容器の天端遮蔽部の中央には、前記支柱外に嵌め合わされて上下にスライド可能な対支柱固定部兼用のガイド部材が備えられ、該ガイド部材と前記捕集容器上端固定部には、前記ガイド部材が降下して捕集容器上端固定部に当接することによって両者間を離脱不能に連結する継手機構が備えられていることにより、捕集容器の対支柱固定部兼用のガイド部材を支柱嵌め合わせて沈降させることによって、自動的に捕集容器の天端遮蔽部を支柱に固定することができ、捕集容器の水底設置が容易となる。   In the present invention, as in the third feature, the upper end fixing portion of the collection container that is projected in a flange shape is integrally provided on the outer periphery of the support column, and is provided at the center of the top end shielding portion of the collection container. Is provided with a guide member that also fits outside the support column and can be slid up and down, and also serves as a pair support column fixing part, and the guide member descends on the guide member and the upper end fixing part of the collection container. By having a joint mechanism that connects the upper end fixed part with each other so that they cannot be detached, the guide member that also serves as a counter column fixed part of the collection container is fitted into the column and settled down automatically. In addition, the top end shielding part of the collection container can be fixed to the support column, and the water bottom installation of the collection container becomes easy.

本発明は、上記第４の特徴のように、捕集容器の周壁部は、水平断面が円形に形成され、所定高さ間隔毎に該円形に沿った配置に補強兼用の保形部材を備え、上下に隣り合う該円形保形部材間の前記膜材が上下に折りたたまれることによって蛇腹状が形成されていることにより、捕集容器水底での展張作業が容易となる。   According to the present invention, as in the fourth feature, the peripheral wall portion of the collection container is formed in a circular shape in a horizontal section, and is provided with a shape-retaining member that also serves as a reinforcement at a predetermined height interval along the circular shape. Since the bellows shape is formed by folding the membrane material between the circular shape-retaining members adjacent to each other in the vertical direction, the expansion work at the bottom of the collection container is facilitated.

本発明は、上記第５の特徴のように、筒状をした周壁部と、該周壁部の上端を閉鎖させた上側が先細りのテーパ状をした天端遮蔽部とを有し、該天端遮蔽部に対支柱固定部兼用のガイド部材が固定され、かつ前記周壁部が上下に折り畳み可能に形成された捕集容器を形成しておき、前記捕集容器の周壁部の下端に沈設用の錘を固定し該周壁部を上下に畳んだ状態を維持させておくとともに、水面上より支柱を垂加させて所望の水底地盤内に該支柱の下端を貫入させて自立させ、該支柱の上端を前記捕集容器の天端遮蔽部の対支柱固定部兼用のガイド部材内に貫通させた状態で前記錘の重量を利用して該捕集容器を支柱に沿って沈降させ、前記支柱の所定の高さ位置に予め固定しておいた捕集容器上端固定部に前記対支柱固定部兼用のガイド部材が当接した状態で、前記錘が更に沈降して水底面に沈設されることにより周壁部を上下に伸長させて内部に水底自噴メタンガス捕集空間を形成させ、該水底自噴メタンガス捕集空間の下端より上昇する水底自噴メタンガスを、該水底自噴メタンガス捕集空間の上端部内に連通させた捕集ガス導出用通路を通して水面上に導出させるようにしたことにより、従来困難であった、広範に水底自噴メタンガス噴出域を覆う水底自噴メタンガス捕集装置の設置が、容易且つ低コストでなされる。   As described in the fifth feature, the present invention includes a cylindrical peripheral wall portion, and a top end shielding portion whose upper end is tapered such that the upper end of the peripheral wall portion is closed. A guide member that also serves as a supporting column fixing part is fixed to the shielding part, and a collecting container in which the peripheral wall part is formed to be vertically foldable is formed, and a sinking container is installed at the lower end of the peripheral wall part of the collecting container. The weight is fixed and the peripheral wall portion is kept folded up and down, and the column is suspended from above the water surface so that the lower end of the column penetrates into the desired underwater ground and becomes self-supporting. In the state where the top end shielding portion of the collection container is passed through the guide member that also serves as a support for the support column, the collection container is allowed to settle along the support column using the weight of the weight, The guide portion that also serves as the anti-post fixing portion to the upper end fixing portion of the collection container that has been fixed in advance at the height position In the state of contact, the weight further sinks and is set on the bottom surface of the water, thereby extending the peripheral wall portion up and down to form a water bottom self-injecting methane gas collecting space inside the water bottom self-injecting methane gas collecting space. The bottom self-injecting methane gas rising from the lower end is led to the surface of the water through the collection gas outlet passage communicating with the upper end of the bottom self-injecting methane gas collection space. Installation of the bottom-floor self-injection methane gas collection device that covers the self-injection methane gas ejection area is easy and low-cost.

本発明は上記第６の特徴のように、捕集容器は、その周壁部下端の錘を水面上に浮かべた浮体に吊り下げた状態で水面下に吊り下げ、これを曳航して前記水底地盤上に立設した支柱の上端上に移動させ、前記錘をクレーン船によって支持させた状態で浮体から切り離し、前記天端遮蔽部の捕集容器上端固定部を前記支柱に嵌合させた状態で前記錘とともに捕集容器を沈降させることにより、大型の捕集容器の運搬、沈設が容易となる。   As in the sixth aspect of the present invention, the collection container is suspended below the surface of the water in a state where the weight at the lower end of the peripheral wall is suspended on a floating body floating on the surface of the water. In a state where the column is moved above the upper end of the support column and is separated from the floating body while the weight is supported by a crane ship, and the collection container upper end fixing part of the top shield part is fitted to the support column. By sinking the collection container together with the weight, it is easy to transport and set a large collection container.

本発明に係る水底噴出水底自噴メタンガス捕集装置の一実施例の概略を示す縦断面図である。It is a longitudinal cross-sectional view which shows the outline of one Example of the bottom-out spouting bottom methane gas collection apparatus which concerns on this invention. （ａ）〜（ｃ）は、それぞれ捕集容器の膜状材に対する補強線材の固定状態例を示す断面図である。(A)-(c) is sectional drawing which shows the example of the fixed state of the reinforcement wire with respect to the film-form material of a collection container, respectively. 図１に示す装置における捕集容器留め具と捕集容器上端支持部材の嵌合状態を示す半断面図である。It is a semi-sectional view which shows the fitting state of the collection container fastener and collection container upper end support member in the apparatus shown in FIG. （ａ）（ｂ）は、同上の装置における捕集容器の形成工程を示す部分断面図である。(A) (b) is a fragmentary sectional view which shows the formation process of the collection container in an apparatus same as the above. 本発明に使用する上昇流発生手段の一例を示す部分断面図である。It is a fragmentary sectional view which shows an example of the upward flow generation means used for this invention. 本発明に係る水底噴出水底自噴メタンガス捕集装置の捕集容器沈設方法における捕集容器洋上曳航状態を示す部分断面図である。It is a fragmentary sectional view which shows the collection container offshore towing state in the collection container laying method of the submerged jet bottom self-injection methane gas collection device which concerns on this invention. 同上の捕集容器の支柱上からの沈降初期状態を示す半断面図である。It is a half sectional view showing the initial settling state from the support column of the same collection container.

本発明の実施の形態を、実施例の図面に基づいて説明する。   Embodiments of the present invention will be described with reference to the drawings of the embodiments.

図１は本発明に係る水底自噴メタンガス捕集装置の第一実施例の概略構成を示している。図において符号Ａは捕集容器を示している。この捕集容器Ａは、筒状をした周壁部１の天端が天端遮蔽部２で閉鎖され、下端側を解放した逆さカップ状に成形されておりその内部が水底自噴メタンガス捕集空間となっている。周壁部１の直径は、下端部において５０ｍ〜１００ｍ程度とする。   FIG. 1 shows a schematic configuration of a first embodiment of a water bottom self-injecting methane gas collecting apparatus according to the present invention. In the figure, symbol A indicates a collection container. This collection container A is formed in an inverted cup shape in which the top end of the cylindrical peripheral wall portion 1 is closed by the top end shielding portion 2 and the lower end side is released. It has become. The diameter of the surrounding wall part 1 shall be about 50-100 m in a lower end part.

周壁部１及び天端遮蔽部２はそれぞれ可撓性の膜状材をもって構成されており、一例として、ポリエステル繊維やガラス繊維を材料としたシートに防水被覆を施した不透水性シートが使用でき、周壁部１には週方向に向けた鋼棒や鋼線からなる補強線材３が、上下に一定の間隔を隔てて固定されている。   The peripheral wall portion 1 and the top end shielding portion 2 are each composed of a flexible film-like material. For example, a water-impermeable sheet obtained by applying a waterproof coating to a sheet made of polyester fiber or glass fiber can be used. A reinforcing wire 3 made of a steel bar or a steel wire oriented in the week direction is fixed to the peripheral wall portion 1 at a certain interval in the vertical direction.

この補強線材３は、多数にリング状材を使用する他、１本の線材を螺旋状に形成したものであってもよく、これらは、例えば図２（ａ）に示すようにその表裏何れかの１面側に固定し、周囲を不透水性の防錆樹脂材で被覆し、頒布１に一体化させる他、図２（ｂ）に示すように補強線材３をその肉厚内に埋設し、その埋設部分を補強線材３の太さ分だけ肉厚に成形したもの、更には図２（ｃ）に示すように帆布又は合成樹脂膜などの膜状材４を２重にし、その間に補強線材３を挟み込んで一体化させたもの等が使用できる。   The reinforcing wire 3 may be formed by using a ring-shaped material in a large number, or may be one in which a single wire is formed in a spiral shape. These may be either front or back as shown in FIG. 2 (a), for example. In addition to covering the periphery with an impervious rust-proof resin material and integrating it with the cloth cloth 1, as shown in FIG. 2 (b), a reinforcing wire 3 is embedded in the wall thickness. The embedded portion is formed to have a thickness corresponding to the thickness of the reinforcing wire 3. Further, as shown in FIG. 2 (c), a membrane material 4 such as a canvas or a synthetic resin film is doubled and reinforced between them. The thing etc. which pinched | interposed and integrated the wire 3 can be used.

このように膜状材４と補強線材３とによって構成された周壁部１は、膜状材４が補強線材３，３間で折り曲げ可能になっており、全体が周壁部軸方向に折り畳み可能な蛇腹状となっており、後述する設置工程において、蛇腹を折り畳んで高さを縮小させた状態で搬送できるようになっている。   As described above, the peripheral wall portion 1 constituted by the film-like material 4 and the reinforcing wire 3 is such that the film-like material 4 can be folded between the reinforcing wire materials 3 and 3, and the whole can be folded in the axial direction of the peripheral wall portion. It has a bellows shape, and can be transported in a state in which the bellows is folded and the height is reduced in an installation step described later.

天端遮蔽部２は、上側が小径のテーパ状に成形され、これを構成する膜材においても補強線材６が同心配置で、半径方向に一定間隔を隔てて前述した周壁部１と同様の構造にて設置され、膜材の補強線材６，６間は湾曲可能となっており、設置時には湾曲状態が伸びて全体がテーパ状となるように構成されている。   The top end shielding portion 2 is formed in a tapered shape with a small diameter on the upper side, and the reinforcing wire 6 is concentrically arranged also in the film material constituting the top end shielding portion 2, and has the same structure as the peripheral wall portion 1 described above with a constant interval in the radial direction. The reinforcing wire rods 6 and 6 of the membrane material can be bent, and the curved state is extended at the time of installation so that the whole is tapered.

天端遮蔽部２の中央には、水底地盤１０上に立設した支柱１１が上下に貫通されている。この支柱１１は、直径１〜２ｍ程度の鋼管を使用し、下端を自立に必要な所定長さだけ水底地盤１０に貫入させて自立させるとともに、図には示してないが水底面に沈めたアンカーに繋いだ支線を複数使用して潮流に抗するように立設している。   In the center of the top end shielding portion 2, a support column 11 erected on the water bottom ground 10 is vertically penetrated. This strut 11 uses a steel pipe having a diameter of about 1 to 2 m, and has its lower end penetrated into the bottom bottom ground 10 by a predetermined length necessary for self-supporting. Standing up against the tidal current using multiple branch lines connected to

支柱１１には、水底面から所定の高さ位置に捕集容器留め具１５が固着されている。この捕集容器留め具１５は、支柱１１の外周にフランジ状に張り出させた捕集容器支持リング部１６と、その上面に備えた係止部１７とから構成されている。   A collection container fastener 15 is fixed to the column 11 at a predetermined height position from the bottom of the water. The collection container fastener 15 is composed of a collection container support ring portion 16 projecting in a flange shape on the outer periphery of the support column 11 and a locking portion 17 provided on the upper surface thereof.

捕集容器Ａの天端遮蔽部２の中央には支柱１１を貫通させた対支柱固定部兼用のガイド部材１８が固着されており、この支持部材１８に支柱挿通孔１９が上下に貫通開口されているとともに、下面には前記係止部１７に嵌まり合う係止爪２０が備えられている。   A guide member 18 that also serves as a counter column fixing unit that penetrates the column 11 is fixed to the center of the top end shielding unit 2 of the collection container A, and a column insertion hole 19 is vertically opened through the support member 18. In addition, a locking claw 20 that fits into the locking portion 17 is provided on the lower surface.

係止部１７と係止爪２０は、捕集容器Ａの対支柱固定部兼用のガイド部材１８が支柱に沿って降下し、支柱１１の捕集容器留め具１５に突き当たることによって互いに抜け出し不能に嵌め合わされるようにしているものであり、係止部１７は図３に示すように、捕集容器留め具１５の上面の支柱外周部分に拡径部２１を形成し該拡径部の奥側にさらに系の大きい凹溝２２を形成することによって係止段部２３を形成した形状となっている。   The locking portion 17 and the locking claw 20 cannot be pulled out from each other when the guide member 18 serving also as a counter column fixing portion of the collection container A descends along the column and abuts against the collection container fastener 15 of the column 11. As shown in FIG. 3, the engaging portion 17 is formed with an enlarged diameter portion 21 on the outer peripheral portion of the support column on the upper surface of the collection container fastener 15, and the rear side of the enlarged diameter portion. In addition, by forming a concave groove 22 having a larger system, a locking step portion 23 is formed.

係止爪２０は、その先端部外側に拡径部２１内に挿入するための先細りのテーパ面２４が形成され、そのテーパ面２４上端側を拡径部２１に嵌まり合う径に形成した凹溝２５を形成することによって係止鉤２６を形成した形状となっている。   The locking claw 20 is formed with a tapered taper surface 24 to be inserted into the enlarged diameter portion 21 on the outer side of the distal end portion, and a concave portion formed so that the upper end side of the tapered surface 24 fits the enlarged diameter portion 21. By forming the groove 25, the locking rod 26 is formed.

これら係止部１７及び係止爪２０は、係止爪２０の先端が被係止具の拡径部２１に挿入されることによってテーパ面２４が拡径部２１の上縁に押されて拡径部半径方向に弾性変形し、係止鉤２６が拡径部２１を通り凹溝２２に至ることにより、係止鉤２６が係止段部２３に係合されて抜け止めされるようになっている。   The locking portion 17 and the locking claw 20 are expanded by the tip end of the locking claw 20 being inserted into the enlarged diameter portion 21 of the locked tool so that the tapered surface 24 is pushed by the upper edge of the enlarged diameter portion 21. When the locking rod 26 is elastically deformed in the radial direction of the diameter portion and passes through the enlarged diameter portion 21 and reaches the concave groove 22, the locking rod 26 is engaged with the locking step portion 23 and is prevented from coming off. ing.

捕集容器Ａの周壁部１の下端には、沈設用の錘３０が固定されている。この錘３０は捕集容器Ａの上端側を前述した支柱１１の捕集容器留め具１５に支持させた状態で周壁部下端を水底地盤１０上に定着させるためのものであり、周壁部１の下端を所定の形状に拡張させた状態で着底させるようにしている。   A sinking weight 30 is fixed to the lower end of the peripheral wall portion 1 of the collection container A. The weight 30 is for fixing the lower end of the peripheral wall portion on the water bottom ground 10 with the upper end side of the collection vessel A supported by the collection vessel fastener 15 of the support column 11 described above. It is made to bottom in the state which extended the lower end to the predetermined shape.

錘３０としては、円環を複数割にした形状の鋼管３１からなる被膜と、その内部に充填したコンクリート３２とから構成される複数の分割錘部材３３を連結させて環状とし、これに周壁部１の下縁を連結しているものであり、これが着底した状態で、捕集容器Ａの周壁部１の蛇腹が上下に伸長され、捕集容器Ａが逆さカップ状に拡張されている。   As the weight 30, a plurality of divided weight members 33 constituted by a coating made of a steel pipe 31 having a shape in which a ring is divided into a plurality of parts and a concrete 32 filled therein are connected to form an annular shape, and a peripheral wall portion is connected thereto. 1, the bellows of the peripheral wall portion 1 of the collection container A is extended vertically, and the collection container A is expanded in an inverted cup shape.

尚、この錘３０は、上述したコンクリート詰め鋼管の他、多数のコンクリートブロックを周壁部１の下縁に連結し、これらを周壁部下縁の拡張形状に合わせた位置に沈設してもよい。   In addition, this weight 30 may connect many concrete blocks to the lower edge of the surrounding wall part 1 other than the concrete filling steel pipe mentioned above, and may sink these in the position matched with the expansion shape of the surrounding wall part lower edge.

支柱１１は、その上端が水面上又はその近くに達し、内部が捕集容器Ａ内に捕集した水底自噴メタンガスの捕集ガス導出用通路４０としており、上端と捕集支援船４１との間をフレキシブルホース４２で連結している。   The strut 11 has an upper end reaching or near the water surface, and the inside serves as a collection gas derivation passage 40 for the submerged self-injected methane gas collected in the collection vessel A. Between the upper end and the collection support vessel 41 Are connected by a flexible hose 42.

支柱１１の前述した捕集容器留め具１５の下側、即ち捕集容器Ａ内に位置する部分には、複数の捕集容器内捕集ガス導出口４３が内外に貫通開口されており、捕集容器Ａ内に捕集されて水底自噴メタンガスは、気泡状のもの及びメタンハイドレートによる被膜付の粒状のものを含めて捕集容器内捕集ガス導出口４３より支柱１１内に流入させるようになっている。   A plurality of in-collection container collection gas outlets 43 are formed through the inside and outside of the column 11 below the collection container fastener 15 described above, that is, in the collection container A. The submerged self-injected methane gas collected in the collection container A is allowed to flow into the support column 11 from the collection gas extraction port 43 in the collection container, including bubbles and granular methane hydrate-coated particles. It has become.

一方支柱１１には、その内部の捕集ガス導出用通路４０内を水底自噴メタンガスがスムーズに上昇するようにするために上昇流発生手段が備えられている。この上昇流発生手段の一例として、図５に示すようなスクリューコンベア４６を使用している。   On the other hand, the strut 11 is provided with an upward flow generating means for smoothly raising the bottom self-injecting methane gas in the collected gas outlet passage 40 inside thereof. As an example of the upward flow generating means, a screw conveyor 46 as shown in FIG. 5 is used.

このスクリューコンベア４６は、捕集容器内捕集ガス導出口４３より低い位置に固定したモーター４７と、全捕集容器内捕集ガス導出口４３より低い位置から全捕集容器内捕集ガス導出口４３位置を通過してその上に至る長さの螺旋羽根付のスクリュー４８とから構成され、これを回転させることによって捕集ガス導出路４０内に上昇流を発生させ、これによって捕集容器内捕集ガス導出口４３内へ水底自噴メタンガスを吸引し、スクリュー４８によって強制的に上昇させる。   The screw conveyor 46 includes a motor 47 fixed at a position lower than the collection gas outlet 43 in the collection container, and a collection gas guide in all collection containers from a position lower than the collection gas outlet 43 in all collection containers. It is composed of a screw 48 with a spiral blade having a length passing through the position of the outlet 43 and reaching it, and by rotating this screw, an upward flow is generated in the collection gas lead-out path 40, thereby collecting the collection container The water bottom self-injected methane gas is sucked into the internally collected gas outlet 43 and is forcibly raised by the screw 48.

また、水底自噴メタンガスがメタンハイドレート被膜付の水底自噴メタンガス粒である場合には、捕集容器内捕集ガス導出口４３内に入り込んでくるガス粒をスクリュー４８により掻き取るようにして分離させ、捕集ガス導出用通路４０内を強制的に上昇させることとなる。   When the bottom self-injecting methane gas is water bottom self-injecting methane gas particles with a methane hydrate coating, the gas particles entering the collection gas outlet 43 in the collection container are scraped off by the screw 48 and separated. Then, the inside of the collected gas outlet passage 40 is forcibly raised.

このようにして捕集ガス導出用通路４０内を強制上昇される水底自噴メタンガスの内、被膜付粒状のものは、一定の水深に達すると被膜が壊れガス状となって上昇する。   Of the submerged self-injected methane gas that is forcibly raised in the collection gas outlet passage 40 in this way, the granular one with a coating rises in a gaseous state when the coating reaches a certain depth.

捕集ガス導出用通路４０内における上昇流発生手段は、上述したスクリューコンベア方式のものを捕集容器内捕集ガス導出口４３より高い位置に備えてもよく、またスクリューコンベア方式の他に捕集ガス導出用通路４０内に水中ポンプを設置しこれを必要には応じて作動させて上昇流を生じさせてもよい。   As the upward flow generating means in the collected gas outlet passage 40, the above-described screw conveyor type may be provided at a position higher than the trapped gas outlet 43 in the collection container. A submersible pump may be installed in the gas collection outlet passage 40 and operated as necessary to generate an upward flow.

更に、上昇流発生手段としてエアリフトを使用してもよく、エアリフトを使用する場合は、初期の上昇流を発生させる際に空気を捕集ガス導出用通路４０内に送り込み、水底自噴メタンガスの捕集状態が連続して継続される状態となった場合には捕集した水底自噴メタンガスをリフト用のガスとして送り込み、水底自噴メタンガスの気泡の浮力によって生じる上昇流を利用する。このようにすることによって捕集される水底自噴メタンガスをエアリフト用の空気によって希釈させることなく捕集できる。   Further, an air lift may be used as the upward flow generating means. When the air lift is used, when the initial upward flow is generated, air is sent into the collection gas outlet passage 40 to collect the bottom self-injected methane gas. When the state is continuously continued, the collected bottom self-injected methane gas is sent as a lift gas, and the upward flow generated by the buoyancy of bubbles in the bottom self-injected methane gas is used. By doing so, the bottom self-injected methane gas collected can be collected without diluting with air for airlift.

尚、捕集容器Ａ内に捕集される水底自噴メタンガスが、メタンハイドレート被膜の無い気泡である場合には、これらの上昇流発生手段は必ずしも必要ではない。   In addition, when the bottom self-injection methane gas collected in the collection container A is a bubble without a methane hydrate film, these upward flow generation means are not necessarily required.

支柱１１内を上昇する水底自噴メタンガスは、その支柱１１内に水が存在している場合には、その水に溶け込み、高濃度の水底自噴メタンガス溶解水として上昇する。この高濃度水底自噴メタンガス溶解水は、ホース４２を通して支援船４１上に汲み上げ、セパレータ（図示せず）を使用して水底自噴メタンガスと水とを分離させ、水底自噴メタンガスのみを船上のタンクに貯留させ残余の水は海に戻す。   When water exists in the column 11, the bottom self-injecting methane gas rising in the column 11 dissolves in the water and rises as high-concentration bottom-side self-injected methane gas dissolved water. This high concentration water bottom self-injected methane gas dissolved water is pumped up on the support ship 41 through the hose 42, and the bottom self-injected methane gas and water are separated using a separator (not shown), and only the water bottom self-injected methane gas is stored in the tank on the ship. Let the remaining water return to the sea.

尚、図には示してないが、水とガスとを分離するセパレータを支柱１１の水面下位置に設けておき、ここで分離させたガスのみを支援船Ｂ上のガスタンクに貯留させるようにしてもよい。   Although not shown in the figure, a separator for separating water and gas is provided at a position below the water surface of the column 11 so that only the separated gas is stored in the gas tank on the support ship B. Also good.

捕集容器Ａの天端遮蔽部２には、水底付近に比べて温度の高い表層水を注入する表層水供給パイプ４５が挿入されており、捕集容器Ａ内の上部の捕集容器内捕集ガス導出口４３付近に、表層水を送り込むようにしている。この表層水の供給によって、捕集容器内捕集ガス導出口４３がメタンハイドレート被膜付の水底自噴メタンガス粒によって詰りが生じた際にこれを融解させて流れを回復させる。   A top surface water supply pipe 45 for injecting surface water having a temperature higher than that near the bottom of the water is inserted into the top end shielding portion 2 of the collection container A, and the upper inside of the collection container A is captured in the collection container A. Surface water is sent to the vicinity of the gas collection outlet 43. By supplying the surface layer water, when the trapped gas outlet 43 in the collection container is clogged with water-bottomed self-injected methane gas particles with a methane hydrate coating, it is melted to restore the flow.

尚、この表層水の供給は常時継続させておき、氷被膜付の水底自噴メタンガス粒を常時融解させるようにし、気泡状の水底自噴メタンガスのみが捕集ガス導出用通路４０を上昇させるようにしてもよい。   It should be noted that the supply of surface water is always continued so that the water bottom self-injecting methane gas particles with ice coating are always melted, and only the bubble-like water bottom self-injecting methane gas raises the collected gas outlet passage 40. Also good.

また、この実施例では、支柱１１内を捕集容器Ａ内に捕集された水底自噴メタンガスの導出路としているが、支柱１１を捕集容器Ａの支持のみのものとし、これとは別にフレキシブルホースなどのパイプを導出路として使用してもよい。   Further, in this embodiment, the inside of the support column 11 is used as a lead-out path for the submerged self-injected methane gas collected in the collection container A. However, the support column 11 is used only for supporting the collection container A, and it is flexible separately from this. A pipe such as a hose may be used as the lead-out path.

更に、上述した捕集容器Ａ内への表層水の供給は必ずしも必要ではなく、水底自噴メタンガスが噴出している水底地盤の水深が浅い場合など、気泡状態で水底自噴メタンガスが噴出している箇所では使用しなくてもよい。   Further, it is not always necessary to supply surface water into the collection container A described above, and the location where the bottom self-injecting methane gas is ejected in a bubble state, such as when the depth of the bottom ground where the bottom self-injecting methane gas is ejected is shallow. Then you do not have to use it.

更に、上述した例では、捕集容器Ａの周壁部１を円筒状に形成した場合を示しているが、この他多角形断面の筒状であってもよく、また上下の内径に変化のない筒状の他、円錐状又は角錐状であってもよい。   Furthermore, although the example mentioned above has shown the case where the surrounding wall part 1 of the collection container A is formed in a cylindrical shape, it may have a cylindrical shape with other polygonal cross sections, and there is no change in the upper and lower inner diameters. Besides a cylindrical shape, it may be a conical shape or a pyramid shape.

次に上述した実施例における捕集容器Ａの沈設方法について説明する。   Next, a method for setting the collection container A in the above-described embodiment will be described.

図４（ａ）に示すように、ドック又は陸上の製作ヤード上に分割錘部材３３を構成するコンクリート未充填の鋼管３１を所要数円形に並べる。その上に捕集容器Ａの周壁部１を構成する膜状材である帯状膜材４ａをその下縁を各鋼管３１，３１......順次連結しつつ円形に配置し、１層目の帯状膜材４ａを組み立てる。次いで図４（ｂ）に示すように、１層目の帯状材４ａの外周に補強線材３を円周方向に向けて固定する。補強線材３は、周壁部１の全周に亘って無端の環状としてもよく、周壁部１の円周方向に複数分割したものを円形配置にして帯状材４ａに固定してもよい。   As shown in FIG. 4A, the steel pipes 31 not filled with concrete constituting the divided weight member 33 are arranged in a required number of circles on a dock or onshore production yard. On top of that, a belt-like membrane material 4a, which is a membrane material constituting the peripheral wall portion 1 of the collection container A, is arranged in a circular shape with its lower edges sequentially connected to the steel pipes 31, 31. The band-shaped film material 4a is assembled. Next, as shown in FIG. 4B, the reinforcing wire 3 is fixed to the outer periphery of the first layer of strip-shaped material 4a in the circumferential direction. The reinforcing wire 3 may be an endless ring over the entire circumference of the peripheral wall 1, or a plurality of the peripheral walls 1 divided in the circumferential direction may be circularly arranged and fixed to the belt-like material 4 a.

次いで１層目の帯状材４ａの上に２層目の帯状材４ｂをつなぎ合わせて一体化させ円形の２層目を形成し、その外周に前述と同様に補強線材３を固定する。同様にして３層目以降も順次連結していき最上部層までを一体化させて補強線材付の周壁部１を形成する。尚、各層の連結作業に際しては、図４（ｂ）に示すように下側の層の帯状材を畳み、上下の補強線材３、３を接近させた状態で順次上層を継ぎ足していく。   Next, the second-layer belt material 4b is joined and integrated on the first-layer belt material 4a to form a circular second layer, and the reinforcing wire 3 is fixed to the outer periphery in the same manner as described above. Similarly, the third and subsequent layers are sequentially connected and integrated up to the uppermost layer to form the peripheral wall portion 1 with a reinforcing wire. When connecting the layers, as shown in FIG. 4 (b), the lower layer strips are folded, and the upper layers are successively added while the upper and lower reinforcing wires 3 and 3 are brought close to each other.

このようにして補強線材３を一体化させた周壁部１を形成した後、その上端に天端遮蔽部２を固着する。天端遮蔽部２の形成は、その円錐形を複数分割した形状の扇形片をつなぎ合わせ、これに無端の環状又は円周方向に複数分割した補強線材６を固定するとともに、形成された天端遮蔽部２中央に対支柱固定部兼用のガイド部材１８を固定する。   After forming the peripheral wall portion 1 in which the reinforcing wire 3 is integrated in this way, the top end shielding portion 2 is fixed to the upper end thereof. The top shield portion 2 is formed by connecting a plurality of fan-shaped pieces having a conical shape and fixing an endless annular or circumferentially divided reinforcing wire 6 and fixing the top end A guide member 18 that also serves as a counter column fixing portion is fixed at the center of the shielding portion 2.

このようにして形成された捕集容器Ａを、図６に示すように周壁部１の補強線材３，３......間を蛇腹状に折り畳んで高さを縮めた状態で錘３０を構成する鋼管３１に対して吊り兼用の開き止め具５０にて繋ぎ止め、その上に浮５１を付けて洋上に浮かべ、沈設現場に曳航する。   As shown in FIG. 6, the collection container A formed in this manner is folded in a bellows shape between the reinforcing wires 3, 3,... The steel pipe 31 constituting the steel pipe 31 is fastened with a suspension stopper 50 that also serves as a suspension, and a float 51 is attached to the steel pipe 31 to float on the ocean, and towed to the settling site.

沈設現場では、図には示してないが杭打ち船を使用して所望長さの鋼管を順次継ぎ足しながら垂下させ、下端を所望の水底地盤１０に貫入させて自立した支柱１１を設置する。この時、捕集容器Ａの沈設後における上端に相当する高さ位置の鋼管に、図１に示している前記捕集容器留め具１５を一体化させておくとともに、必要な表層水供給パイプ４５を組みつけておく。   At the site of settling, although not shown in the drawing, a steel pipe having a desired length is suspended while being sequentially added by using a pile driving ship, and a self-supporting column 11 is installed with a lower end penetrating into a desired underwater ground 10. At this time, the collecting container fastener 15 shown in FIG. 1 is integrated with a steel pipe at a height corresponding to the upper end after the collection container A is set, and a necessary surface water supply pipe 45 is provided. Assemble.

尚、図１において符号５２は、支柱１１の上端部を構成する上端部鋼管であり、支柱１１が最終設置高さまで水底地盤１０に貫入される前に、カプラー５３を使用して取り外し可能に連結しておき、図７に示すように捕集容器Ａを支柱１１上へ移動させる際には、支柱１１からカプラー５３を取り外し、支柱１１の上端が捕集容器Ａの移動に支障の無い高さとなるようにする。そして、捕集容器Ａの支柱１１をガイドとした沈降作業後に上端部鋼管５２を連結して支柱上端を水面上高さとし、フレキシブルホース４２を連結する。   In FIG. 1, reference numeral 52 denotes an upper end steel pipe constituting the upper end portion of the support column 11, which is removably connected using a coupler 53 before the support column 11 penetrates into the bottom ground 10 to the final installation height. When the collection container A is moved onto the support column 11 as shown in FIG. 7, the coupler 53 is removed from the support column 11, and the upper end of the support column 11 has a height that does not hinder the movement of the collection container A. To be. Then, after the sedimentation operation using the support column 11 of the collection container A as a guide, the upper end steel pipe 52 is connected, the upper end of the support column is set to the height above the water surface, and the flexible hose 42 is connected.

次いで、周壁部１を蛇腹状に畳んだ状態で洋上を曳航してきた捕集容器Ａを自立している支柱１１の上に移動させ、天端遮蔽部２の中央に固定されている対支柱固定部兼用のガイド部材１８の支柱挿通孔１９に支柱１１の上端を嵌め合わせる。これら捕集容器Ａの支柱１１上への移動作業、支柱挿通孔１９への支柱１１嵌挿作業及び後述する沈降作業は、複数のクレーン船Ｃを使用して行う。   Next, the trapping container A that has been towed offshore with the peripheral wall 1 folded in a bellows shape is moved onto a self-supporting column 11 and fixed to a column that is fixed to the center of the top shield 2. The upper end of the column 11 is fitted into the column insertion hole 19 of the guide member 18 serving as a part. The movement operation of the collection container A onto the support column 11, the operation of inserting the support column 11 into the support column insertion hole 19, and the settling operation described later are performed using a plurality of crane ships C.

捕集容器Ａの沈設に先立ち、錘３０用の鋼管３１内に、コンクリート３２を充填し、予定した重さとし、クレーン船Ｃにて錘３０を吊り下げた状態で周壁部１を蛇腹状に畳んだ状態に維持している開き止め具５０を外すとともの浮５１を外す。   Prior to the collection of the collection container A, the steel pipe 31 for the weight 30 is filled with concrete 32, and the weight is as expected, and the peripheral wall 1 is folded in a bellows shape with the weight 30 suspended by the crane ship C. The floating stopper 51 which removes the opening stopper 50 maintained in the state is removed.

この状態で捕集容器Ａを水底まで降下させる。この時対支柱固定部兼用のガイド部材１８が支柱１１に沿って降下するためこれがガイドとなり、所定の位置に降下させることができる。   In this state, the collection container A is lowered to the bottom of the water. At this time, since the guide member 18 serving also as the support column fixing part descends along the support column 11, it serves as a guide and can be lowered to a predetermined position.

このようにして降下させることにより、対支柱固定部兼用のガイド部材１８が支柱１１捕集容器留め具１５に当ることにより、捕集容器留め具１５の係止部１７に係止部１７に対支柱固定部兼用のガイド部材１８の係止爪２０が嵌まり込み、離脱不能な状態となる。この状態で錘３０を水底まで降下させることにより周壁部１が予定した高さに拡張されて捕集容器Ａの沈設が完了する。次いでクレーン船Ｃの吊ワイヤーをリモートコントロールによって錘３０から外し回収する。   By lowering in this way, the guide member 18 that also serves as the pair support column fixing part hits the collection container fastener 15 of the support column 11, so that the engagement part 17 of the collection container fastener 15 is opposed to the engagement part 17. The locking claw 20 of the guide member 18 that also serves as the column fixing part is fitted and cannot be removed. In this state, the weight 30 is lowered to the bottom of the water, so that the peripheral wall 1 is expanded to a predetermined height and the collection of the collection container A is completed. Next, the suspension wire of the crane ship C is removed from the weight 30 by remote control and recovered.

尚、クレーン船Ｃによる吊り下げは、錘３０用の鋼管３１内へのコンクリート３２の充填作業、開き止め具５０及び浮５１の取り外し作業までとし、その後の沈降は、自由落下としてもよい。   The suspension by the crane ship C includes the work of filling the concrete 32 into the steel pipe 31 for the weight 30 and the work of removing the opening stopper 50 and the float 51, and the subsequent settling may be a free fall.

上述した捕集容器Ａの沈設作業の後、又はこれに並行して支柱１１に対する支線の設置作業、支柱１１の上端と捕集支援船４１とのホース連結などの作業を行う。   After the above-described setting operation of the collection container A or in parallel with this, operations such as installing a branch line for the column 11 and connecting the hose between the upper end of the column 11 and the collection support vessel 41 are performed.

Ａ 捕集容器
Ｂ 支援船
Ｃ クレーン船
Ｐ ポンプ
１ 周壁部
２ 天端遮蔽部
３ 補強線材
４ 膜状材
４ａ，４ｂ 帯状材
６ 補強線材
１０ 水底地盤
１１ 支柱
１５ 捕集容器留め具
１６ 捕集容器支持リング部
１７ 係止部
１８ ガイド部材
１９ 支柱挿通孔
２０ 係止爪
２１ 拡径部
２２ 凹溝
２３ 係止段部
２４ テーパ面
２５ 凹溝
２６ 係止鉤
３０ 錘
３１ 鋼管
３２ コンクリート
３３ 分割錘部材
４０ 捕集ガス導出用通路
４１ 捕集支援船
４２ フレキシブルホース
４３ 捕集容器内捕集ガス導出口
４５ 表層水供給パイプ
４６ スクリューコンベア
４７ モーター
４８ 螺旋羽根付のスクリュー
５０ 開き止め具
５１ 浮
５２ 上端部鋼管
５３ カプラー A Collection container B Support ship C Crane ship P Pump 1 Surrounding wall part 2 Top end shielding part 3 Reinforcement wire 4 Film-like material 4a, 4b Strip-like material 6 Reinforcement wire 10 Submarine ground 11 Support column 15 Collection container fastener 16 Collection container Support ring portion 17 Locking portion 18 Guide member 19 Column insertion hole 20 Locking claw 21 Expanded portion 22 Groove 23 Locking step portion 24 Tapered surface 25 Groove 26 Locking rod 30 Weight 31 Steel pipe 32 Concrete 33 Split weight member 40 Collected gas outlet passage 41 Collection support ship 42 Flexible hose 43 Collected gas outlet 45 in the collection container Surface water supply pipe 46 Screw conveyor 47 Motor 48 Screw 50 with spiral blades Opening stopper 51 Float 52 Upper end Steel pipe 53 coupler

Claims (6)

水底自噴メタンガスが自噴している水底のメタンガス噴出口を覆うための下側が解放した逆さカップ状の捕集容器を有し、
該捕集容器内に噴出した水底自噴メタンガスを、該捕集容器の上端部内開口させた捕集容器内捕集ガス導出口より捕集ガス導出用通路を通して船上に導出するようにした水底自噴メタンガス捕集装置において、
水底面上に立設した支柱を備え、前記捕集容器の上端部に前記支柱を貫通させ、該支柱の所定高さ位置に該捕集容器の上端を固定させ、
前記捕集容器は、筒状をした周壁部を有し、該周壁部の上端を上側が先細りのテーパ状をした天端遮蔽部にて閉鎖させ、
前記周壁部は、折り畳み可能な不透水性の膜材をもって形成されているとともに、該周壁部の下端に水底面に沈設される錘が連結されており、
前記支柱に対して前記捕集容器の天端遮蔽部を固定し、前記錘を水底に沈設させた状態で前記周壁部が折り畳まれた状態から伸長されて、内部に水底自噴メタンガス捕集空間が形成されるようにしたことを特徴とする水底自噴メタンガス捕集装置。 It has an upside down cup-shaped collection container with the lower side open to cover the bottom methane gas spout from the bottom self-injecting methane gas,
Underwater self-injecting methane gas ejected into the collection vessel is extracted from the collection gas outlet port in the collection vessel opened in the upper end of the collection vessel to the ship through the collection gas outlet passage. In the collection device,
It is provided with a support column erected on the bottom surface of the water, penetrates the support column through the upper end of the collection container, and fixes the upper end of the collection container at a predetermined height position of the support column,
The collection container has a cylindrical peripheral wall part, and the upper end of the peripheral wall part is closed by a top end shielding part having a tapered shape on the upper side,
The peripheral wall portion is formed with a foldable impermeable membrane material, and a weight that is sunk on the water bottom is connected to the lower end of the peripheral wall portion,
The top end shielding portion of the collection container is fixed to the support column, and the peripheral wall portion is extended from a state where the weight is sunk in the bottom of the water. A water-bottom self-injecting methane gas collector characterized by being formed. 前記支柱は、中空の筒状材が使用され、その下端を水底地盤に嵌入させて立設させ、前記捕集容器の天端遮蔽部を固定した高さより下側に前記中空筒状の内外に貫通開口させた捕集容器内捕集ガス導出口が形成され、該捕集容器内に捕集されて上昇する水底自噴メタンガスを、前記支柱内を捕集ガス導出用通路として導出させるようにした請求項１に記載の水底自噴メタンガス捕集装置   The column is made of a hollow cylindrical material, and the lower end of the column is inserted into the water bottom ground to stand, and the hollow cylindrical inside and outside below the height at which the top end shielding portion of the collection container is fixed. A collection gas outlet in the collection container having a through-opening is formed, and the bottom self-injected methane gas collected and raised in the collection container is led out as a collection gas extraction passage in the support column. The water bottom self-injecting methane gas collecting device according to claim 1. 前記支柱の外周にはフランジ状に張り出させた捕集容器上端固定部が一体に備えられ、前記捕集容器の天端遮蔽部の中央には、前記支柱外に嵌め合わされて上下にスライド可能な対支柱固定部兼用のガイド部材が備えられ、該ガイド部材と前記捕集容器上端固定部には、前記ガイド部材が降下して捕集容器上端固定部に当接することによって両者間を離脱不能に連結する継手機構が備えられている請求項１又は２に記載の水底自噴メタンガス捕集装置。   A collection container upper end fixing part that protrudes in a flange shape is integrally provided on the outer periphery of the support column, and is fitted to the outside of the support column at the center of the top end shielding part of the collection container and can be slid up and down. A guide member that also serves as a pair of supporting columns is provided, and the guide member and the collection container upper end fixing part cannot be separated from each other when the guide member descends and comes into contact with the collection container upper end fixing part. The submarine self-injection methane gas collection apparatus of Claim 1 or 2 provided with the coupling mechanism connected with this. 前記捕集容器の周壁部は、水平断面が円形に形成され、所定高さ間隔毎に該円形に沿った配置に補強兼用の保形部材を備え、上下に隣り合う該円形保形部材間の前記膜材が上下に折りたたまれることによって蛇腹状が形成されている請求項１〜３の何れか１に記載の水底自噴メタンガス捕集装置。   The peripheral wall portion of the collection container is formed in a circular shape in a horizontal section, and is provided with a shape-retaining member for reinforcement in an arrangement along the circle at predetermined height intervals, and between the circular shape-retaining members adjacent to each other in the vertical direction. The water bottom self-injection methane gas collection device according to any one of claims 1 to 3, wherein a bellows shape is formed by folding the membrane material up and down. 筒状をした周壁部と、該周壁部の上端を閉鎖させた上側が先細りのテーパ状をした天端遮蔽部とを有し、該天端遮蔽部に対支柱固定部兼用のガイド部材が固定され、かつ前記周壁部が上下に折り畳み可能に形成された捕集容器を形成しておき、
前記捕集容器の周壁部の下端に沈設用の錘を固定し該周壁部を上下に畳んだ状態を維持させておくとともに、
水面上より支柱を垂加させて所望の水底地盤内に該支柱の下端を貫入させて自立させ、
該支柱の上端を前記捕集容器の天端遮蔽部の対支柱固定部兼用のガイド部材内に貫通させた状態で前記錘の重量を利用して該捕集容器を支柱に沿って沈降させ、
前記支柱の所定の高さ位置に予め固定しておいた捕集容器上端固定部に前記対支柱固定部兼用のガイド部材が当接した状態で、前記錘が更に沈降して水底面に沈設されることにより周壁部を上下に伸長させて内部に水底自噴メタンガス捕集空間を形成させ、
該水底自噴メタンガス捕集空間の下端より上昇する水底自噴メタンガスを、該水底自噴メタンガス捕集空間の上端部内に連通させた捕集ガス導出用通路を通して水面上に導出させることを特徴とする水底自噴メタンガス捕集方法。 It has a cylindrical peripheral wall part and a top end shielding part whose upper end with the upper end of the peripheral wall part being tapered is tapered, and a guide member that is also used as a counter column fixing part is fixed to the top end shielding part And forming a collecting container in which the peripheral wall portion can be folded up and down,
While fixing the weight for sinking to the lower end of the peripheral wall portion of the collection container and maintaining the peripheral wall portion folded up and down,
Let the pillars hang down from the surface of the water and let the lower ends of the pillars penetrate into the desired bottom of the ground to be self-supporting,
Using the weight of the weight in the state where the upper end of the column is passed through the guide member that also serves as a counter column fixing unit of the top end shielding unit of the collection vessel, the collection vessel is allowed to settle along the column,
The weight further sinks and is set on the bottom of the water in a state where the guide member also serving as the counter column fixing unit is in contact with the upper end fixing unit of the collection container that is fixed in advance at a predetermined height position of the column. By extending the peripheral wall part up and down by this, a water bottom self-injection methane gas collection space is formed inside,
A water bottom self-injecting methane gas rising from the lower end of the water bottom self-injecting methane gas collecting space is led out to the surface of the water through a collection gas outlet passage communicating with the upper end of the water bottom self-injecting methane gas collecting space. Methane gas collection method. 前記捕集容器は、その周壁部下端の錘を水面上に浮かべた浮体に吊り下げた状態で水面下に吊り下げ、これを曳航して前記水底地盤上に立設した支柱の上端上に移動させ、前記錘をクレーン船によって支持させた状態で浮体から切り離し、前記天端遮蔽部の捕集容器上端固定部を前記支柱に嵌合させた状態で前記錘とともに捕集容器を沈降させる請求項５に記載の水底自噴メタンガス捕集方法。   The collection container is suspended below the surface of the water in a state where the weight at the lower end of the peripheral wall is suspended on a floating body, and is towed to move onto the upper end of a support column erected on the bottom of the water And separating the collection container together with the weight in a state in which the weight is separated from the floating body while being supported by a crane ship, and the collection container upper end fixing part of the top end shielding part is fitted to the column. 5. A method of collecting water bottom self-injecting methane gas according to 5.
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107607366A (en) * 2017-10-09 2018-01-19 中国石油天然气集团公司 A kind of methane collection device, coal seam gas production well discharge of methane measure apparatus and method
CN109747832A (en) * 2018-12-29 2019-05-14 厦门星衡电子科技有限责任公司 A kind of unmanned plane air-drop acquisition pernicious gas device
JP2019157462A (en) * 2018-03-12 2019-09-19 株式会社三井Ｅ＆Ｓホールディングス Gas production system and gas production method

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107607366A (en) * 2017-10-09 2018-01-19 中国石油天然气集团公司 A kind of methane collection device, coal seam gas production well discharge of methane measure apparatus and method
CN107607366B (en) * 2017-10-09 2019-10-11 中国石油天然气集团公司 A kind of methane collection device, coal seam gas production well discharge of methane measurement device and method
JP2019157462A (en) * 2018-03-12 2019-09-19 株式会社三井Ｅ＆Ｓホールディングス Gas production system and gas production method
CN109747832A (en) * 2018-12-29 2019-05-14 厦门星衡电子科技有限责任公司 A kind of unmanned plane air-drop acquisition pernicious gas device

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