JP2010139039A - Gap supply construction method by means of underground pipeline in case of disaster - Google Patents
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- 239000007789 gas Substances 0.000 description 157
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Abstract
Description
本発明は、災害時に漏洩・損傷が生じた埋設パイプラインにおいて、要求のある区域に対して早期にガス供給を再開させることができる、埋設パイプラインによる災害時ガス供給工法に関するものである。 The present invention relates to a gas supply construction method at the time of a disaster using an embedded pipeline, which can restart gas supply to a required area at an early stage in an embedded pipeline where leakage / damage has occurred during a disaster.
地震等の災害時に埋設パイプラインに漏洩や損傷事故が生じると、ガス漏洩による二次災害を避けるために埋設パイプラインによるガス供給を漏洩や損傷箇所の上流側で遮断することが必要になる。これによって遮断箇所の下流側区域ではガス供給が停止されることになるが、埋設パイプラインの漏洩・損傷箇所を完全に修復してガス供給を再開させるには復旧工事に時間を要することになり、早期復旧の要望に応えられない問題があった。 If a leak or damage accident occurs in the buried pipeline at the time of a disaster such as an earthquake, it is necessary to shut off the gas supply by the buried pipeline upstream of the leaked or damaged portion in order to avoid a secondary disaster due to gas leakage. As a result, the gas supply will be stopped in the downstream area of the shutoff point, but it will take time for the restoration work to completely repair the leaked / damaged part of the buried pipeline and restart the gas supply. There was a problem that could not meet the request for early recovery.
これに対して、下記特許文献１に記載された従来技術では、流動性を有して早期硬化可能な遮断材料を、破損したガス導管の損傷箇所周辺の土砂に供給し、損傷箇所周辺の土砂を硬化させることで損傷箇所からのガス噴出を防止することを提案している。これによると、ガス供給を停止することなく、一時的にガス導管の損傷箇所を修復することが可能になる。
前述の従来技術は比較的小規模なガス噴出時には効果的であるが、埋設パイプラインの分断等の大きな事故が生じた場合には対応することができない。また、家屋の倒壊や火災発生等でガスの噴出箇所を特定できない、或いはガス噴出箇所の近傍に近づけない状況では対応することができない。 The above-described prior art is effective when a relatively small-scale gas is ejected, but cannot cope with a large accident such as the division of an embedded pipeline. In addition, it is not possible to cope with a situation in which a gas ejection location cannot be specified due to a collapse of a house, a fire, or the like, or cannot be brought close to the vicinity of the gas ejection location.
このような場合には、やはりガス漏洩が発生していると想定される箇所の上流側でガス供給を遮断せざるを得ない。この場合には、図１に示すように、埋設パイプラインに予め装備している遮断バルブを閉じてその下流側へのガス供給を遮断することになる。 In such a case, the gas supply must be shut off at the upstream side where the gas leakage is assumed to occur. In this case, as shown in FIG. 1, the shutoff valve provided in advance in the buried pipeline is closed to shut off the gas supply to the downstream side.
図１においては、ガバナGを介して埋設パイプラインＰ１〜Ｐ５にガス供給がなされている（各埋設パイプラインの交差部は接続されている）。ここで、埋設パイプラインＰ１に漏洩・損傷箇所Ｄ１が確認され、また、家屋の倒壊等でガス供給不要区域Ｄ２が形成されたとすると、図示のような既設の遮断バルブの配備状況では、遮断バルブＢ１〜Ｂ４を閉じることで、斜線で示したようなガス供給停止区域Ｃを形成することになる。 In FIG. 1, gas is supplied to the buried pipelines P1 to P5 through the governor G (intersections of the buried pipelines are connected). Here, if a leak / damage point D1 is confirmed in the buried pipeline P1 and a gas supply unnecessary area D2 is formed due to a collapse of a house or the like, in the deployment situation of the existing shutoff valve as shown in the figure, the shutoff valve By closing B1-B4, the gas supply stop area C as shown by the oblique line is formed.
この場合、既設の遮断バルブは状況に応じてガス供給停止区域を区切るように備えられているとは限らないので、形成されるガス供給停止区域Ｃの中には、家屋の倒壊等から難を免れた地域Ａ１〜Ａ４が含まれることになり、そのような地域からガス供給の要求があったとしても、漏洩・損傷箇所Ｄ１の修復工事が完了し、地域Ｄ２での調査で安全が確認されるまではガス供給を再開させることができないことになる。 In this case, since the existing shutoff valve is not necessarily provided to divide the gas supply stop area according to the situation, the formed gas supply stop area C is difficult to prevent from collapse of the house. Evacuated areas A1 to A4 will be included, and even if there is a demand for gas supply from such areas, the repair work for the leaked / damaged part D1 is completed and the safety in the area D2 is confirmed. Until then, the gas supply cannot be resumed.
前述した状況で敢えて地域Ａ１〜Ａ４へのガス供給を再開させるためには、漏洩・損傷箇所Ｄ１及びがガス供給不要区域Ｄ２の上流側で埋設パイプラインを開削して、埋設パイプラインを切断すると共に上流側パイプラインの端部を閉塞処理する大規模な工事が必要になり、部分的な復旧を優先するがために全体的な復旧工事を遅らせることにもなりかねない。 In order to restart the gas supply to the areas A1 to A4 in the situation described above, the buried pipeline is cut by opening the buried pipeline upstream of the leakage / damage point D1 and the gas supply unnecessary area D2. At the same time, a large-scale construction for closing the end of the upstream pipeline is necessary, and partial restoration is prioritized, so that the overall restoration work may be delayed.
本発明は、このような事情に対処するために提案されたものであって、災害時に、漏洩・損傷箇所或いはガス供給不要区域を除いてガス供給区域をブロック化し、災害時のガス供給を効率的に行う。災害時のガス供給停止区域内で、ガス供給要求区域を選択してその区域に早期にガス供給を再開させることを目的とする。 The present invention has been proposed to cope with such a situation. In the event of a disaster, the gas supply area is blocked except for leaked / damaged parts or areas where gas supply is not required, so that the gas supply at the time of the disaster can be efficiently performed. Do it. The purpose is to select a gas supply requirement area in the area where gas supply is stopped at the time of a disaster and to restart the gas supply to that area at an early stage.
このような目的を達成するために、本発明は、以下の特徴を有する。すなわち、埋設パイプラインによる災害時のガス供給工法であって、埋設パイプラインの漏洩・損傷箇所の上流側であり且つガス供給要求区域の下流側となる全ての埋設パイプラインの選択箇所に、既設の連通管を介して或いは非開削で埋設パイプラインに形成した穿孔部を介して、埋設パイプライン内にガス遮断部材を充填させる工程を有し、前記漏洩・損傷箇所の上流側に、前記ガス遮断部材の充填箇所によってブロック化したガス供給区域を形成することを特徴とする。 In order to achieve such an object, the present invention has the following features. In other words, it is a gas supply construction method in the event of a disaster using an embedded pipeline, and is installed at the selected locations of all the embedded pipelines that are upstream of the leaked / damaged portion of the embedded pipeline and downstream of the gas supply requirement area. A gas blocking member is filled in the buried pipeline through a perforated part formed in the buried pipeline by non-cutting, and the gas is disposed upstream of the leakage / damage point. A blocked gas supply area is formed by a filling portion of the blocking member.
また、埋設パイプラインによる災害時のガス供給工法であって、埋設パイプラインにガス供給不要区域が存在する場合に、埋設パイプラインの前記ガス供給不要区域の上流側であり且つガス供給要求区域の下流側となる全ての埋設パイプラインの選択箇所に、既設の連通管を介して或いは非開削で埋設パイプラインに形成した穿孔部を介して、埋設パイプライン内にガス遮断部材を充填させる工程を有し、前記ガス供給不要区域の上流側に、前記ガス遮断部材の充填箇所によってブロック化したガス供給区域を形成することを特徴とする。 Further, it is a gas supply method at the time of a disaster by a buried pipeline, and when there is a gas supply unnecessary area in the buried pipeline, it is upstream of the gas supply unnecessary area of the buried pipeline and the gas supply required area. A step of filling the buried pipeline with a gas blocking member in a selected portion of all the buried pipelines on the downstream side through an existing communication pipe or a perforated portion formed in the buried pipeline by non-cutting. And a gas supply area that is blocked by a filling portion of the gas blocking member is formed on the upstream side of the gas supply unnecessary area.
また、埋設パイプラインによる災害時のガス供給工法であって、埋設パイプラインにガス供給不要区域が存在する場合に、埋設パイプラインの漏洩・損傷箇所及び前記ガス供給不要区域の上流側であり且つガス供給要求区域の下流側となる全ての埋設パイプラインの選択箇所に、既設の連通管を介して或いは非開削で埋設パイプラインに形成した穿孔部を介して、埋設パイプライン内にガス遮断部材を充填させる工程を有し、前記漏洩・損傷箇所及び前記ガス供給不要区域の上流側に、前記ガス遮断部材の充填箇所によってブロック化したガス供給区域を形成することを特徴とする。 Further, it is a gas supply method at the time of a disaster by a buried pipeline, and when there is a gas supply unnecessary area in the buried pipeline, it is upstream of the leaked / damaged part of the buried pipeline and the gas supply unnecessary area, and A gas blocking member in the buried pipeline via the existing communication pipe or a perforated part formed in the buried pipeline without opening at the selected location of all buried pipelines downstream of the gas supply requirement area And a gas supply area blocked by a filling position of the gas blocking member is formed upstream of the leakage / damage position and the gas supply unnecessary area.
また、埋設パイプラインによる災害時のガス供給工法であって、ガス供給不要区域が存在する場合に、埋設パイプラインの漏洩・損傷箇所及び前記ガス供給不要区域を囲むように、既設の遮断バルブを閉止してガス供給停止区域を形成する工程と、前記ガス供給停止区域内で、前記漏洩・損傷箇所及び前記ガス供給不要区域の上流側であり且つガス供給要求区域の下流側となる全ての埋設パイプラインの選択箇所に、既設の連通管を介して或いは非開削で埋設パイプラインに形成した穿孔部を介して、埋設パイプライン内にガス遮断部材を充填させる工程と、前記遮断バルブを開放して、前記ガス供給要求区域にガス供給を行う工程とを有することを特徴とする。 In addition, when there is a gas supply construction method at the time of a disaster by an embedded pipeline, and there is an area where gas supply is not required, an existing shutoff valve is installed so as to surround the leaked / damaged part of the embedded pipeline and the gas supply unnecessary area A process of closing to form a gas supply stop area, and all embeddings in the gas supply stop area that are upstream of the leakage / damage point and the gas supply unnecessary area and downstream of the gas supply request area Filling the buried pipeline with a gas cutoff member via an existing communication pipe or a perforated portion formed in the buried pipeline without cutting at a selected portion of the pipeline; and opening the cutoff valve And a step of supplying a gas to the gas supply request area.
更には、前述した特徴に加えて、前記埋設パイプライン内にガス遮断部材を充填させる工程は、前記連通管である埋設パイプラインに連通する供給管の地上部から該供給管を介して、前記埋設パイプライン内に固化剤を充填することを特徴とする。 Further, in addition to the above-described features, the step of filling the buried pipeline with the gas blocking member may be performed by the supply pipe from the ground portion of the supply pipe communicating with the buried pipeline as the communication pipe. The embedding pipeline is filled with a solidifying agent.
また、前述した特徴に加えて、前記埋設パイプライン内にガス遮断部材を充填させる工程は、埋設パイプラインに通じる極小穴立坑を掘削し、該極小穴立坑を通した穿孔機によって埋設パイプラインを穿孔し、前記極小穴立坑を通した案内管の下端を穿孔部に当接し、該案内管を介してガスバッグを埋設パイプライン内に挿入して拡径することを特徴とする。 Further, in addition to the above-described features, the step of filling the buried pipeline with the gas blocking member excavates a very small hole shaft that leads to the buried pipeline, and the buried pipeline is formed by a drilling machine that passes through the minimal hole shaft. The guide tube is drilled, the lower end of the guide tube passing through the small hole shaft is brought into contact with the drilled portion, and the gas bag is inserted into the buried pipeline through the guide tube to increase the diameter.
このような特徴によると、埋設パイプラインにガス遮断部材を充填させる箇所を任意の位置に選択することができるので、埋設パイプラインの漏洩・損傷箇所の位置、或いは家屋の倒壊等でガス供給が不要になった地域の範囲に応じて、ガス供給区域を任意にブロック化することが可能になる。これによって、ガス供給要求区域に対して、漏洩・損傷箇所の復旧を待たずに早期にガス供給を行うことが可能になる。また、ガス供給要求区域とガス供給不要区域が隣接するような場合にも、これを適正に区分けして効率的にガス供給を行うことが可能になる。 According to such a feature, it is possible to select the location where the buried pipe line is filled with the gas blocking member at an arbitrary position, so that the gas supply can be performed due to the leakage / damage location of the buried pipeline or the collapse of the house. It is possible to arbitrarily block the gas supply area according to the range of the area that has become unnecessary. This makes it possible to supply gas to the gas supply request area at an early stage without waiting for recovery of the leaked / damaged part. In addition, even when the gas supply request area and the gas supply unnecessary area are adjacent to each other, it is possible to appropriately supply the gas by efficiently dividing the area.
更には、埋設パイプラインにガス遮断部材を充填させる工程では、非開削で充填作業を行うことができるので、災害後のガス供給要求に対応したガス供給区域のブロック化を速やかに行うことができ、ガス供給の早期復旧の要求に迅速に対応することができる。 Furthermore, in the process of filling the buried pipeline with the gas blocking member, the filling operation can be performed without cutting, so that the gas supply area corresponding to the gas supply request after the disaster can be quickly blocked. In addition, it is possible to respond promptly to requests for early recovery of gas supply.
以下、本発明の実施形態を図面に基づいて説明する。なお、本発明の実施形態で対象としている災害時とは、地震などの自然災害に限らず、掘削重機等で埋設パイプラインが損傷を受けるといった人為的な災害も含んでいる。 Hereinafter, embodiments of the present invention will be described with reference to the drawings. The disaster at the time of the embodiment of the present invention is not limited to natural disasters such as earthquakes, but also includes man-made disasters in which buried pipelines are damaged by heavy excavators and the like.
図２は、本発明の実施形態に係る埋設パイプラインによる災害時ガス供給工法の説明図である。図示の例では、図１に示した例と同様に、ガバナGを介して埋設パイプラインＰ１〜Ｐ５にガス供給がなされており、災害によって、埋設パイプラインＰ１に漏洩・損傷箇所Ｄ１が確認され、また、家屋の倒壊等でガス供給不要区域Ｄ２が形成された状況を示している。ここでは、漏洩・損傷箇所Ｄ１とガス供給不要区域Ｄ２が共に形成されているが、漏洩・損傷箇所Ｄ１のみが存在する場合、ガス供給不要区域Ｄ２のみが存在する場合、これら両方が存在する場合の何れであってもよい。 FIG. 2 is an explanatory diagram of a disaster gas supply method using an embedded pipeline according to an embodiment of the present invention. In the example shown in the figure, gas is supplied to the buried pipelines P1 to P5 through the governor G as in the example shown in FIG. 1, and a leak / damage point D1 is confirmed in the buried pipeline P1 due to a disaster. Moreover, the situation where the gas supply unnecessary area D2 was formed by collapse of a house, etc. is shown. Here, both the leak / damage point D1 and the gas supply unnecessary area D2 are formed together, but when only the leak / damage point D1 exists, when only the gas supply unnecessary area D2 exists, both of these exist Any of these may be used.
このような状況で、ガス供給要求区域Ａ１〜Ａ４が存在する場合に、漏洩・損傷箇所Ｄ１の上流側であり且つガス供給要求区域Ａ１〜Ａ４の下流側となる全ての埋設パイプラインＰ１〜Ｐ５の選択箇所に、ガス遮断部材充填箇所Ｓを形成する。また、ガス供給不要箇所Ｄ２が存在する場合に、ガス供給不要箇所Ｄ２の上流側であり且つガス供給要求区域Ａ１〜Ａ４の下流側となる全ての埋設パイプラインＰ１〜Ｐ５の選択箇所に、ガス遮断部材充填箇所Ｓを形成する。このガス遮断部材充填箇所Ｓによって、それより下流側へのガス供給が停止され、図示のガス供給停止区域Ｃ１が形成されることになって、その他の区域をガス供給区域としてブロック化することができる。 In this situation, when the gas supply request areas A1 to A4 exist, all the buried pipelines P1 to P5 that are upstream of the leakage / damage portion D1 and downstream of the gas supply request areas A1 to A4. The gas blocking member filling point S is formed at the selected point. In addition, when the gas supply unnecessary portion D2 exists, the gas is supplied to the selected portions of all the buried pipelines P1 to P5 that are upstream of the gas supply unnecessary portion D2 and downstream of the gas supply request areas A1 to A4. The blocking member filling portion S is formed. The gas supply to the downstream side is stopped by the gas blocking member filling point S, and the gas supply stop area C1 shown in the figure is formed, and the other areas can be blocked as gas supply areas. it can.
このガス供給停止区域Ｃ１は、任意の選択位置にガス遮断部材充填箇所Ｓを形成することができるので、図１に示した既設の遮断バルブＢ１〜Ｂ４を閉じることで形成される広域なガス供給停止区域Ｃに比べて、区域の広さを必要最小限に限定することができる。そして、ガス供給要求区域Ａ３，Ａ４とガス供給不要区域Ｄ２のように、これらが互いに近接しているような場合にも、両者をガス遮断部材充填箇所Ｓによって区分けし、ガス供給のためのブロック化を効果的に行うことができる。 This gas supply stop zone C1 can form a gas blocking member filling point S at an arbitrary selected position, so a wide range gas supply formed by closing the existing blocking valves B1 to B4 shown in FIG. Compared to the stop area C, the size of the area can be limited to a necessary minimum. And even when these are close to each other, such as the gas supply request areas A3 and A4 and the gas supply unnecessary area D2, they are separated by the gas blocking member filling point S, and a block for gas supply Can be effectively performed.
この工法の利点は、任意の位置を選択してガス遮断部材充填箇所Ｓを形成できる点にある。これによって、例えば図３に示したように漏洩・損傷箇所Ｄ１とガス供給不要区域Ｄ２が形成された場合であっても、これらの上流側にガス遮断部材充填箇所Ｓを形成することで、既設の遮断バルブＢ１，Ｂ３と組み合わせるなどして、漏洩・損傷箇所Ｄ１とガス供給不要区域Ｄ２を囲むようにガス供給停止区域Ｃ３を形成し、それ以外の区域をガス供給区域としてブロック化することができる。 The advantage of this method is that the gas blocking member filling portion S can be formed by selecting an arbitrary position. As a result, for example, as shown in FIG. 3, even if the leakage / damage point D1 and the gas supply unnecessary area D2 are formed, the gas blocking member filling point S is formed on the upstream side thereof, thereby providing the existing The gas supply stop area C3 is formed so as to surround the leakage / damage point D1 and the gas supply unnecessary area D2 by combining with the shutoff valves B1 and B3, and the other areas are blocked as gas supply areas. it can.
埋設パイプライン内にガス遮断部材を充填させ、前述したガス遮断部材充填箇所Ｓを形成する工程としては、非開削で簡易に埋設パイプラインのガス流通を遮断できる工法を採用する。図４及び図５は、そのための工法の一例を示した説明図である。 As a process of filling the buried pipeline with the gas blocking member and forming the gas blocking member filling portion S described above, a construction method that can easily block the gas flow of the buried pipeline without cutting is adopted. 4 and 5 are explanatory views showing an example of a construction method therefor.
図４に示した例では、埋設パイプラインＰに固化剤Ｍを充填することで、ガス遮断部材充填箇所Ｓを形成する。この例では、埋設パイプラインＰの連通管Ｐ０１を介して埋設パイプラインＰ内に固化剤Ｍを充填している。連通管Ｐ０は埋設パイプラインＰが本管の場合は供給管に当たるものであり、その地上部Ｐ０１a（灯外内管及びメーター立管）に固化剤充填装置１０の放出口１１を接続する。
In the example illustrated in FIG. 4, the gas blocking member filling portion S is formed by filling the embedded pipeline P with the solidifying agent M. In this example, the embedded pipeline P is filled with the solidifying agent M through the communication pipe P01 of the embedded pipeline P. The communication pipe P0 corresponds to the supply pipe when the buried pipeline P is the main pipe, and the
固化剤Ｍとしては、充填後１ヶ月後においても難透気性を有し、任意の固化時間の極めて短い流体を用いることが好ましい。 As the solidifying agent M, it is preferable to use a fluid that is hardly air-permeable even after one month after filling and has an extremely short solidification time.
図５に示した例では、非開削で埋設パイプラインＰに形成した穿孔部Ｐ0を介して、埋設パイプライン内にガス遮断部材であるガスバッグを充填させている。より詳しくは、埋設パイプラインＰに通じる極小穴立坑Ｔを掘削し、極小穴立坑Ｔを通した穿孔機によって埋設パイプラインを穿孔して穿孔部Ｐ0を形成する。そして、極小穴立坑Ｔを通した案内管Ｔ１の下端を穿孔部Ｐ0に当接し、案内管Ｔ１を介してガスバッグＱを埋設パイプラインＰ内に挿入して拡径する。 In the example shown in FIG. 5, a gas bag, which is a gas blocking member, is filled in the embedded pipeline through a perforated portion P 0 formed in the embedded pipeline P by non-cutting. More specifically, a very small hole shaft T leading to the buried pipeline P is excavated, and the buried pipeline is drilled by a drilling machine that has passed through the minimal hole shaft T to form the drilled portion P 0 . Then, contact the lower end of the guide tube T1 through a minimum hole pit T to perforation P 0, it is enlarged by inserting a gas bag Q to buried pipeline P via the guide tube T1.
ガスバッグＱの例としては、耐火性を有する素材で覆われており、高強度を有し、０．１ＭＰａ程度の供給圧で拡径後約１ヶ月間のガス遮断効果を有する高密度ガスバッグを用いる。ガスバッグＱの拡径には、窒素ガス等の非爆，非燃性の気体を用いる。 An example of the gas bag Q is a high-density gas bag that is covered with a fire-resistant material, has high strength, and has a gas barrier effect for about one month after diameter expansion with a supply pressure of about 0.1 MPa. Is used. For expanding the gas bag Q, non-explosive and non-flammable gas such as nitrogen gas is used.
図６は、本発明の工法の具体的な実施工程を示したフロー図である。災害が発生して埋設パイプラインの漏洩・損傷の可能性がある場合には、先ず遠隔操作又は地震感知による一斉遮断等によって、既設の遮断バルブを閉止し、広域なガス供給停止区域（図１の符号Ｃ参照）を形成する（Ｓ１）。その後、災害現地調査を行い（Ｓ２）、供給継続地区と供給停止地区の見極めを行う（Ｓ３）。 FIG. 6 is a flowchart showing specific steps of the construction method according to the present invention. If there is a possibility of leakage or damage to the buried pipeline due to a disaster, the existing shutoff valve is first closed by remote control or simultaneous shutoff by earthquake detection, etc., and a wide gas supply stop area (Fig. 1) (Refer to symbol C)) (S1). After that, a disaster field survey is conducted (S2), and the supply continuation district and the supply suspension district are determined (S3).
そして、現地調査に基づいて、被害が甚大で供給継続が不可能な地区を供給停止地区とし、その供給停止地区に対しては早期復旧のための計画を立てる（Ｓ２０）。一方、現地調査の結果、供給継続が可能な地区に対しては、供給継続地区のブロック化計画を立てる（Ｓ１０）。 Then, based on the field survey, an area where damage is severe and supply cannot be continued is determined as a supply stop area, and a plan for early recovery is made for the supply stop area (S20). On the other hand, as a result of the field survey, for a district where supply can be continued, a block plan for the supply continuing district is made (S10).
以下、供給継続地区のブロック化について説明すると、バルブ等が存在しない箇所でのガス遮断方法及び前述したガス遮断部材充填箇所Ｓの選択を行う（Ｓ１１）。前述したように、ガス遮断部材充填箇所Ｓの選択に際しては、広域なガス供給停止区域内で、漏洩・損傷箇所及びガス供給不要区域の上流側であり且つガス供給要求区域の下流側となる全ての埋設パイプラインの特定箇所を選択する。 Hereinafter, the blocking of the supply continuation area will be described. The method for shutting off the gas at a place where a valve or the like does not exist and the above-described place for filling the gas shutoff member S are selected (S11). As described above, when selecting the gas blocking member filling point S, all of the gas supply stop area, upstream of the leakage / damage point and the gas supply unnecessary area, and downstream of the gas supply request area. Select a specific part of the buried pipeline.
ガス遮断部材充填箇所Ｓの選択後は、前述した例のように、ガス遮断部材の充填を行い、選択的なガス供給停止区域（図２の符号Ｃ１参照）を形成する（ブロック化の実施：Ｓ１２）。選択的なガス供給停止区域とは、ガス供給要求区域を除いて漏洩・損傷箇所及びガス供給不要区域を囲む区域である。 After the gas blocking member filling portion S is selected, the gas blocking member is filled to form a selective gas supply stop area (see C1 in FIG. 2) as in the above-described example (blocking: S12). The selective gas supply stop area is an area surrounding a leakage / damage point and a gas supply unnecessary area except for the gas supply requirement area.
その後は、ブロック化された供給継続地区において、損傷部位の特定と修理を行うと共に（Ｓ１３）、検査ガスによる漏洩検査を行って、その検査結果に基づいて供給再開を判断する（Ｓ１４）。そして、閉止していた遮断バルブを必要に応じて開放し（Ｓ１５）、ブロック化されたガス供給要求区域に対してガス供給を再開する（Ｓ１６）。ガス供給を再開した後は、円滑なガス供給が行われているか否かをチェックするためのフォローを行う（Ｓ１６）。 After that, in the block supply continuation area, the damaged part is specified and repaired (S13), and a leakage inspection by the inspection gas is performed, and the supply restart is determined based on the inspection result (S14). Then, the shut-off valve that has been closed is opened as necessary (S15), and the gas supply is resumed for the blocked gas supply request area (S16). After resuming the gas supply, follow-up is performed to check whether or not the smooth gas supply is being performed (S16).
このような本発明の実施形態によると、埋設パイプラインにガス遮断部材を充填させる箇所を任意の位置に選択することができるので、埋設パイプラインの漏洩・損傷箇所の位置、或いは家屋の倒壊等でガス供給が不要になった地域の範囲に応じて、ガス供給区域を任意にブロック化することが可能になる。これによって、ガス供給要求区域に対して、漏洩・損傷箇所の復旧を待たずに早期にガス供給を行うことが可能になる。また、ガス供給要求区域とガス供給不要区域が隣接するような場合にも、これを適正に区分けして効率的にガス供給を行うことが可能になる。 According to such an embodiment of the present invention, the location where the gas blocking member is filled in the buried pipeline can be selected at any position, so that the location of the leaked / damaged location of the buried pipeline, the collapse of the house, etc. Thus, it becomes possible to arbitrarily block the gas supply area according to the range of the area where the gas supply is no longer needed. This makes it possible to supply gas to the gas supply request area at an early stage without waiting for recovery of the leaked / damaged part. In addition, even when the gas supply request area and the gas supply unnecessary area are adjacent to each other, it is possible to appropriately supply the gas by efficiently dividing the area.
更には、埋設パイプラインにガス遮断部材を充填させる工程では、非開削で充填作業を行うことができるので、災害後のガス供給要求に対応したガス供給区域のブロック化を速やかに行うことができ、ガス供給の早期復旧の要求に迅速に対応することができる。 Furthermore, in the process of filling the buried pipeline with the gas blocking member, the filling operation can be performed without cutting, so that the gas supply area corresponding to the gas supply request after the disaster can be quickly blocked. In addition, it is possible to respond promptly to requests for early recovery of gas supply.
Ｐ，Ｐ１〜Ｐ５：埋設パイプライン，
Ｐ0：穿孔部，
Ｐ０１：供給管，Ｐ０１a：地上部，
Ｂ１〜Ｂ４：遮断バルブ，
Ａ１〜Ａ４：ガス供給要求区域，
Ｄ１：漏洩・損傷箇所，
Ｄ２：ガス供給不要区域，
Ｃ，Ｃ１：ガス供給停止区域，
Ｓ：ガス遮断部材充填箇所，
Ｍ：固化剤，
Ｑ：ガスバッグ
P, P1-P5: buried pipeline,
P 0 : perforated part,
P01: supply pipe, P01 a: above-ground parts,
B1 to B4: shutoff valves,
A1-A4: Gas supply request area,
D1: Leakage / damage point,
D2: Gas supply unnecessary area,
C, C1: Gas supply stop area,
S: Gas blocking member filling location,
M: solidifying agent,
Q: Gas bag
Claims (6)
埋設パイプラインの漏洩・損傷箇所の上流側であり且つガス供給要求区域の下流側となる全ての埋設パイプラインの選択箇所に、既設の連通管を介して或いは非開削で埋設パイプラインに形成した穿孔部を介して、埋設パイプライン内にガス遮断部材を充填させる工程を有し、
前記漏洩・損傷箇所の上流側に、前記ガス遮断部材の充填箇所によってブロック化したガス供給区域を形成することを特徴とする埋設パイプラインによる災害時ガス供給工法。 It is a gas supply construction method at the time of disaster by a buried pipeline,
Formed in the buried pipeline via existing communication pipes or non-cut-off at selected locations of all buried pipelines that are upstream of the leaked / damaged portion of the buried pipeline and downstream of the gas supply requirement area Having a step of filling a gas blocking member into the buried pipeline through the perforated part;
A gas supply construction method at the time of a disaster by an embedded pipeline, wherein a gas supply area blocked by a filling portion of the gas blocking member is formed upstream of the leakage / damage portion.
埋設パイプラインにガス供給不要区域が存在する場合に、
埋設パイプラインの前記ガス供給不要区域の上流側であり且つガス供給要求区域の下流側となる全ての埋設パイプラインの選択箇所に、既設の連通管を介して或いは非開削で埋設パイプラインに形成した穿孔部を介して、埋設パイプライン内にガス遮断部材を充填させる工程を有し、
前記ガス供給不要区域の上流側に、前記ガス遮断部材の充填箇所によってブロック化したガス供給区域を形成することを特徴とする埋設パイプラインによる災害時ガス供給工法。 It is a gas supply construction method at the time of disaster by a buried pipeline,
If there is a gas supply unnecessary area in the buried pipeline,
Formed in the buried pipeline through existing communication pipes or non-cut-off at selected locations of all buried pipelines that are upstream of the gas supply unnecessary area of the buried pipeline and downstream of the gas supply requirement area Through the perforated part, filling the buried pipeline with the gas barrier member,
A gas supply method at the time of a disaster by an embedded pipeline, wherein a gas supply region blocked by a filling portion of the gas blocking member is formed upstream of the gas supply unnecessary region.
埋設パイプラインにガス供給不要区域が存在する場合に、
埋設パイプラインの漏洩・損傷箇所及び前記ガス供給不要区域の上流側であり且つガス供給要求区域の下流側となる全ての埋設パイプラインの選択箇所に、既設の連通管を介して或いは非開削で埋設パイプラインに形成した穿孔部を介して、埋設パイプライン内にガス遮断部材を充填させる工程を有し、
前記漏洩・損傷箇所及び前記ガス供給不要区域の上流側に、前記ガス遮断部材の充填箇所によってブロック化したガス供給区域を形成することを特徴とする埋設パイプラインによる災害時ガス供給工法。 It is a gas supply construction method at the time of disaster by a buried pipeline,
If there is a gas supply unnecessary area in the buried pipeline,
Leakage / damage of buried pipelines and all buried pipelines that are upstream of the gas supply unnecessary zone and downstream of the gas supply requirement zone, either via existing communication pipes or by non-open cutting Through the perforated part formed in the buried pipeline, filling the buried pipeline with a gas blocking member,
A gas supply construction method at the time of a disaster by an embedded pipeline, wherein a gas supply area blocked by a filling position of the gas blocking member is formed upstream of the leakage / damage area and the gas supply unnecessary area.
ガス供給不要区域が存在する場合に、埋設パイプラインの漏洩・損傷箇所及び前記ガス供給不要区域を囲むように、既設の遮断バルブを閉止してガス供給停止区域を形成する工程と、
前記ガス供給停止区域内で、前記漏洩・損傷箇所及び前記ガス供給不要区域の上流側であり且つガス供給要求区域の下流側となる全ての埋設パイプラインの選択箇所に、既設の連通管を介して或いは非開削で埋設パイプラインに形成した穿孔部を介して、埋設パイプライン内にガス遮断部材を充填させる工程と、
前記遮断バルブを開放して、前記ガス供給要求区域にガス供給を行う工程とを有することを特徴とする埋設パイプラインによる災害時ガス供給工法。 It is a gas supply construction method at the time of disaster by a buried pipeline,
Forming a gas supply stop area by closing an existing shutoff valve so as to surround a leaked / damaged portion of the buried pipeline and the gas supply unnecessary area when there is a gas supply unnecessary area;
Within the gas supply stop area, through the existing communication pipes, to the selected locations of all the buried pipelines that are upstream of the leak / damage area and the gas supply unnecessary area and downstream of the gas supply requirement area. Or filling the buried pipeline with a gas blocking member through a perforated portion formed in the buried pipeline by non-open cutting, and
A gas supply method at the time of a disaster by an embedded pipeline, comprising: opening the shutoff valve and supplying gas to the gas supply request area.
前記連通管である埋設パイプラインに連通する供給管の地上部から該供給管を介して、前記埋設パイプライン内に固化剤を充填することを特徴とする請求項１〜４のいずれかに記載された埋設パイプラインによる災害時ガス供給工法。 The step of filling the buried pipeline with a gas blocking member,
The solidifying agent is filled in the buried pipeline from the ground portion of the supply pipe communicating with the buried pipeline which is the communication pipe, through the supply pipe. Disaster gas supply construction method using a buried pipeline.
埋設パイプラインに通じる極小穴立坑を掘削し、該極小穴立坑を通した穿孔機によって埋設パイプラインを穿孔し、前記極小穴立坑を通した案内管の下端を穿孔部に当接し、該案内管を介してガスバッグを埋設パイプライン内に挿入して拡径することを特徴とする請求項１〜４のいずれかに記載された埋設パイプラインによる災害時ガス供給工法。 The step of filling the buried pipeline with a gas blocking member,
Drilling a very small hole shaft that leads to the buried pipeline, drilling the buried pipeline with a drilling machine that has passed through the very small shaft shaft, abutting the lower end of the guide tube that has passed through the minimal hole shaft, with the drilled portion, The gas supply method at the time of a disaster by the embedded pipeline according to any one of claims 1 to 4, wherein the gas bag is inserted into the embedded pipeline via the pipe to expand the diameter.
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