JP2009235762A - Removing method of chimney internal asbestos-containing lining material by gelling - Google Patents

Removing method of chimney internal asbestos-containing lining material by gelling Download PDF

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JP2009235762A
JP2009235762A JP2008082397A JP2008082397A JP2009235762A JP 2009235762 A JP2009235762 A JP 2009235762A JP 2008082397 A JP2008082397 A JP 2008082397A JP 2008082397 A JP2008082397 A JP 2008082397A JP 2009235762 A JP2009235762 A JP 2009235762A
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lining material
chimney
asbestos
scattering
gelling
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Kazuhiko Sumita
量彦 住田
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ASUA KK
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for reducing an excessive temporary construction cost for a sedimentation tank, filtering apparatus or the like for recovering and treating contaminated water, which is needed when removing an asbestos-containing lining material stuck to the inside of a chimney by a pressurized water injection device, and further reducing a separation step of the contaminated water to water and waste or the like. <P>SOLUTION: When the asbestos-containing lining material internally stuck to the inside of the chimney is removed by the pressurized water injection device, the lining material is removed by preliminarily spraying a wet scattering inhibitor for preventing scattering of asbestos powder preliminarily to the lining material, adding a gelling accelerator to the pressurized water injection device, and gelling the lining material by a crosslinking reaction between the both when injecting the accelerator to the lining material. According to this, the recovery and disposal of the fallen lining material can be easily performed. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、煙突内に内貼りされている石綿が含有されたライニング材をウォータージェットで除去する際の石綿粉塵の飛散防止のための隔離・密閉方法、飛散防止方法、除去方法及び除去後のライニング材の回収・処分方法とその装置に関するものである。   The present invention relates to an isolation / sealing method, an anti-scattering method, a removing method, and a post-removal method for preventing asbestos dust from being scattered when removing the lining material containing asbestos, which is affixed inside the chimney, with a water jet. The present invention relates to a method and an apparatus for collecting and disposing lining materials.

煙突には耐火・断熱保温のためにライニング材が内貼りされている。また、古い煙突のライニング材には人体に有害な石綿が使用されていた。このライニング材には含有率70%以上の石綿で構成されているので非常に含有率が高く、経年劣化とともに周辺へ飛散する恐れがあり非常に危険である。近年、古い煙突の解体・改修にともない石綿が含有しているライニング材を除去する必要性が増大してきた。 The chimney is lined with lining material for fire resistance and heat insulation. In addition, asbestos that is harmful to the human body was used for the lining material of the old chimney. Since this lining material is made of asbestos with a content rate of 70% or more, the content rate is very high. In recent years, the need to remove the lining material contained in asbestos has increased along with the dismantling and repair of old chimneys.

従来の除去方法としては、煙突内部のライニング材をケレン棒等を使用して人力で掻き落としながら解体していく方法や、煙突内にコンクリートもしくはウレタンを充填し、輪切りにして処分する方法等があった。しかし、前者は作業員が直接ライニング材を撤去するために、高所作業の危険性や、飛散した石綿を作業員が直接吸引する危険性がある。また後者は、輪切りにした煙突ごと特別管理産業廃棄物になるために産廃費用が過大になる。そこで新たな施工方法が求められた。 Conventional removal methods include dismantling the lining material inside the chimney while manually scraping it off using a keel rod, filling the chimney with concrete or urethane, and cutting it into a ring and disposing it. there were. However, the former has a risk of working at a high place and a worker directly sucking scattered asbestos because the worker removes the lining material directly. In the latter case, the cost of industrial waste is excessive because the chimney cut into rounds becomes specially managed industrial waste. Therefore, a new construction method was required.

また、従来から煙突や設備配管等のライニング材をウォータージェットで洗浄・除去する方法はあった。しかしながら、石綿が含有しているライニング材の場合は、ウォータージェットで除去後の石綿が混入された汚染処理水を回収して、廃棄物と水を分離処理しなければならない。煙突の高さ・口径及びライニング材の厚さにもよるが、数m〜数十mの汚染処理水を水と石綿等の廃棄物とに沈殿・分離するための沈殿槽もしくはろ過装置が必要である。通常は、ウォータージェットを煙突下部の開口部より入れ、前記ジェットのノズル部分が高速回転しながら加圧水を噴射し、ライニング材を除去しながらウィンチ等で装置を煙突上部まで吊り上げる。煙突下部の開口部より除去後の汚染水を、防水処理をしたコンクリート等の沈殿槽を設置して回収する。この沈殿槽で水と廃棄物を安全に分離した後、廃棄物を回収・処分する。
特開2007−308960号公報
Conventionally, there has been a method of cleaning and removing lining materials such as chimneys and equipment pipes with a water jet. However, in the case of a lining material containing asbestos, it is necessary to separate the waste and water by collecting contaminated treated water mixed with asbestos after removal with a water jet. Depending on the height and diameter of the chimney and the thickness of the lining material, a sedimentation tank or filtration device for precipitating and separating contaminated treated water of several m 3 to several tens m 3 into water and waste such as asbestos is required. Normally, a water jet is inserted from the opening at the lower part of the chimney, the pressurized nozzle is sprayed while the nozzle part of the jet rotates at a high speed, and the apparatus is lifted up to the upper part of the chimney by a winch or the like while removing the lining material. The contaminated water after removal from the opening at the bottom of the chimney is collected by installing a settling tank such as waterproof concrete. After separating water and waste safely in this settling tank, the waste is collected and disposed of.
JP 2007-308960 A

このように煙突内の石綿が含有しているライニング材をウォータージェットで除去する場合には、沈殿槽やろ過装置が必要であり、除去作業場内で沈殿層を設置できる十分なスペースを確保し、水圧等を十分に計算された構造であり、またろ過装置は微細な石綿繊維を完全に補足できる機能が必要であるために、そのための設置費用や完了後の解体費用が過大にならざるを得ない。また、沈殿槽で回収された汚染処理水を、水と石綿等の廃棄物とに完全に分離するためには汚染水の量にもよるが、相当な日数が必要である。   In this way, when removing the lining material contained in the asbestos in the chimney with a water jet, a sedimentation tank and a filtration device are required, ensuring a sufficient space for installing a sedimentation layer in the removal work place, The structure of the water pressure etc. is sufficiently calculated, and the filtration device needs a function that can completely capture fine asbestos fibers, so the installation cost and disassembly cost after completion must be excessive. Absent. Further, in order to completely separate the contaminated treated water collected in the settling tank into water and waste such as asbestos, a considerable number of days are required depending on the amount of contaminated water.

請求項1の発明は、煙突内の石綿が含有しているライニング材をウォータージェットで除去する時に、ゲル状化による石綿飛散の防止方法、除去方法、除去したライニング材を安全に回収・処理する方法である。 According to the first aspect of the present invention, when the lining material contained in the asbestos in the chimney is removed with a water jet, a method for preventing asbestos scattering due to gelation, a removal method, and the removed lining material is safely collected and processed. Is the method.

請求項1の発明により煙突内石綿含有ライニング材をウォータージェットで除去する際に、従来技術で除去した石綿含有ライニング材を含む汚染水を回収・処理するために必要な沈殿槽を簡易にでき、沈殿槽設置のためのスペースを縮小し、仮設費用の大幅削減を可能にした。また廃棄物の分離・回収期間を短縮することによる作業効率の向上により、除去のための工事期間を短縮することが可能となった。また、本発明による場合、作業スペース内におけるアスベスト粉塵の飛散を効果的に抑制することから、作業環境を向上させることができ、作業スペース内の視界も良好となるため、作業の効率化・安全化を図ることができる。 When removing the asbestos-containing lining material in the chimney by the water jet according to the invention of claim 1, the sedimentation tank necessary for collecting and treating the contaminated water containing the asbestos-containing lining material removed by the prior art can be simplified, The space for installing the sedimentation tank has been reduced, enabling a substantial reduction in temporary costs. In addition, by improving the work efficiency by shortening the separation and collection period of waste, it has become possible to shorten the construction period for removal. In addition, according to the present invention, the asbestos dust is effectively prevented from being scattered in the work space, so that the work environment can be improved and the visibility in the work space is improved. Can be achieved.

以下、本発明の実施の形態を説明する。図1は、本実施形態の煙突内石綿含有ライニング材除去方法の全体図を示すものである。次に煙突内石綿含有ライニング材除去の具体的な手順(方法)について説明する。まず煙突内部を隔離・密閉・負圧工程にする手順について説明する。煙突上部に足場等で架台(図1a)を設置する。この架台(図1a)上に金属パイプ・単管等で開口部を囲うように枠を組上げる。この枠組みにプラスチックシートを粘着テープ・接着剤で貼り付け、煙突上部をクリーンルームとして隔離・密閉する。また、この架台(図1a)上には、吹付け装置及びウォータージェットを煙突内で昇降できるウィンチ等の吊り下げ装置(図1)を設置する。次に煙突下部の開口部がある部屋または室内を隔離・密閉する。この隔離・密閉空間には、除去したライニング材を集積し、完全にゲル状化するための集積プール(図1)を設置する。この集積プールは、単管等で枠組みをし、防水シートを敷き詰め、その上にプラスチックシート(厚み0.15mm以上)を2重に敷き詰めて、十分防水効果が保てるように設置する。また、煙突の高さ・口径・ライニング材の厚み等から計算された加圧水の水量に対応できる集積プールの体積と作業スペースが必要である。この隔離・密閉する空間は、床に防水シートを敷き、その上にプラスチックシート(厚み0.15mm以上)を2重に敷き、接着剤・粘着テープ等で養生する。その際には、壁に沿って30cm程度立上げ船形に養生する。また、壁はプラスチックシート(0.10mm以上)を接着剤・粘着テープ等で1重に貼り作業スペースを完全に隔離・密閉する。さらに、煙突内を負圧にするため、上記作業スペースに必要能力数の集塵装置を設置する。この集塵装置は、上記作業スペース内部を負圧で集塵できるものであって、作業スペース内部の空気を吸引するとともに、排気経路には集塵フィルターが設置され、作業スペース内で飛散した石綿粉塵を外部に漏洩させないものである。また、上記作業スペースと外部との間には、中間にエアシャワーを備えたエアシャワー室を有する3室からなるクリーンルーム(図1)が設けられ、作業スペース内で作業した者が作業場外に出る際、エアシャワーにより粉塵を排除することができるようにされている。 Embodiments of the present invention will be described below. FIG. 1 shows an overall view of a method for removing an asbestos-containing lining material in a chimney according to this embodiment. Next, a specific procedure (method) for removing the asbestos-containing lining material in the chimney will be described. First, the procedure for isolating, sealing, and negative pressure processes inside the chimney will be described. A stand (Fig. 1a) will be installed on top of the chimney with a scaffold. A frame is assembled on this frame (Fig. 1a) so as to surround the opening with a metal pipe, a single pipe or the like. A plastic sheet is affixed to this frame with adhesive tape and adhesive, and the upper part of the chimney is isolated and sealed as a clean room. A suspension device (FIG. 1) such as a winch capable of raising and lowering the spraying device and the water jet in the chimney is installed on the gantry (FIG. 1a). Next, isolate or seal the room or room with the opening at the bottom of the chimney. In this isolated / sealed space, an accumulation pool (Fig. 1) will be installed to accumulate the removed lining material and gel it completely. This accumulation pool is framed with a single pipe, and a waterproof sheet is spread over it, and plastic sheets (thickness 0.15 mm or more) are spread over it, and installed so that the waterproof effect can be maintained sufficiently. In addition, an integrated pool volume and work space that can accommodate the amount of pressurized water calculated from the chimney height, caliber, lining thickness, etc. are required. In this space to be isolated and sealed, a waterproof sheet is laid on the floor, and a plastic sheet (thickness of 0.15 mm or more) is doubled on the floor and cured with an adhesive or adhesive tape. In that case, it is cured to a ship shape of about 30cm along the wall. In addition, a plastic sheet (0.10 mm or more) is applied to the wall with an adhesive / adhesive tape, etc., and the work space is completely isolated and sealed. Furthermore, in order to create a negative pressure in the chimney, a required number of dust collectors are installed in the work space. This dust collector can collect the inside of the work space with negative pressure, sucks air inside the work space, and is provided with a dust collecting filter in the exhaust path, and the asbestos scattered in the work space. Dust is not leaked to the outside. In addition, a clean room (FIG. 1) having three air shower rooms with an air shower in the middle is provided between the work space and the outside, and a person working in the work space goes out of the work space. At this time, dust can be removed by an air shower.

次に煙突内の石綿含有ライニング材に対して湿潤・飛散抑制剤吹付け工程が実施される。まず、この湿潤・飛散抑制剤吹付け工程では、上記ライニング材の表面、すなわち煙突の内壁面に、湿潤飛散抑制剤を吹付けることにより行われる。この時から集塵装置を稼動させ作業場内を負圧状態に保ち、換気をする。この吹付けは、吹付け装置(図2)を使用して行う。吹付け装置(図2)を煙突下部の開口部より入れ、予め設置したウィンチ等の吊り下げ装置により煙突内に保持する。吹付け装置には、湿潤飛散抑制剤を送るエアーレススプレイヤーから接続するエアーレスガンにつながるホースが接続され、エアーレスガンによって吹付けを操作する。この吹付け装置のノズルから湿潤飛散抑制剤を半円状に吹付けをしながら引上げる。これにより煙突の内壁に均一に薬剤を吹付けることができる。吹付ける湿潤飛散抑制剤には、PVA(合成高分子ビニルアルコール)・ビニルエマルジョンの水溶液が使用され、ライニング材にほぼ均等に吹き付ける。この湿潤飛散抑制剤は、上記石綿含有ライニング材に浸透することによって湿潤することとなり、除去時に石綿粉塵として飛散することを防止するとともに、その剥離を容易にし、またゲル化促進剤と架橋反応する性質のものである。そして、薬剤の浸透を確認した後、ゲル状化除去工程に移行する。 Next, a wetting / scattering agent spraying step is performed on the asbestos-containing lining material in the chimney. First, in the wetting / scattering agent spraying step, the wetting / scattering agent spraying process is performed by spraying the wetting / scattering inhibitor on the surface of the lining material, that is, the inner wall surface of the chimney. From this point on, the dust collector is operated to maintain a negative pressure in the work area and ventilate. This spraying is performed using a spraying device (FIG. 2). A spraying device (FIG. 2) is inserted through the opening at the bottom of the chimney, and is held in the chimney by a suspension device such as a winch installed in advance. The spraying device is connected to a hose connected to an airless gun connected from an airless sprayer that feeds the wet scattering inhibitor, and the spraying is operated by the airless gun. The wet splash inhibitor is pulled up from the nozzle of this spraying device while spraying it in a semicircular shape. Thereby, a chemical | medical agent can be sprayed uniformly on the inner wall of a chimney. An aqueous solution of PVA (synthetic polymer vinyl alcohol) / vinyl emulsion is used as the sprayed wet splashing inhibitor, and sprayed almost uniformly onto the lining material. This wet scattering inhibitor wets by penetrating into the asbestos-containing lining material, prevents scattering as asbestos dust during removal, facilitates its peeling, and crosslinks with the gelation accelerator. Of nature. Then, after confirming the penetration of the drug, the process proceeds to the gelation removal step.

このゲル化状化除去工程は、湿潤飛散抑制剤を吹付けたライニング材に対し、ウォータージェット(図1)を使用してゲル化促進剤1を高圧で吹付けることによる湿潤飛散抑制剤とゲル化促進剤1の架橋反応でゲル状化するものである。ウォータージェット(図1)を煙突下部の開口部より入れてウィンチ等で吊り下げ煙突内で保持する。このウォータージェット(図1)には、上下に煙突の口径に対応して伸縮する4本のアームがあり、アームの先端にはローラーが付いていて煙突内の上下運動を容易にする。また2箇所の高圧噴射ノズルがあり、高圧水ホースが接続され加圧ポンプから加圧水が送られてくる。この加圧水噴射ノズルの部分が円周方向に高速回転しながら加圧水噴射をして煙突内のライニング材を均等に除去しながら上部に引き上げる。このウォータージェットに投入するゲル化促進剤1には、硼砂・硼酸を使用した水溶液を使う。石綿含有ライニング材は加圧水噴射により容易に剥離し落下し、ゲル状化することにより湿潤飛散抑制剤の吹付け時よりもなお一層石綿粉塵の飛散を抑えることが出来る。 This gelation and removal step is performed by using a water jet (FIG. 1) on a lining material sprayed with a wet scatter inhibitor and spraying the gelation accelerator 1 at a high pressure with a gel. The gelation accelerator 1 is gelled by a crosslinking reaction. A water jet (FIG. 1) is inserted through the opening at the bottom of the chimney and suspended by a winch or the like and held in the chimney. This water jet (Fig. 1) has four arms that expand and contract according to the chimney's caliber up and down, and a roller is attached to the tip of the arm to facilitate vertical movement in the chimney. In addition, there are two high-pressure injection nozzles, and a high-pressure water hose is connected to supply pressurized water from a pressure pump. The pressurized water jet nozzle part is rotated at a high speed in the circumferential direction and jets pressurized water to pull up the lining material in the chimney while removing it uniformly. An aqueous solution using borax / boric acid is used as the gelation accelerator 1 to be introduced into the water jet. The asbestos-containing lining material can be easily peeled off by jetting with pressurized water, dropped, and gelled to further suppress the scattering of asbestos dust than when the wet scattering inhibitor is sprayed.

次に回収・処理工程の説明をする。ウォータージェットで除去落下したライニング材を煙突下部の開口部より掻き出して集積プールに集める。集積プールに集められたライニング材がゲル化に未反応の部分がある時は、ゲル化促進剤2を投入して完全にゲル状化する。ゲル化促進剤2は、高分子ポリマーを使用する。ゲル状化したライニング材を、作業場内で2重に密閉した袋に入れて特別管理産業廃棄物として処理する。上記のゲル状化によって煙突内の石綿含有ライニング材の除去作業を効率よく行うことができるとともにゲル状化することにより石綿粉塵になって飛散することを防止することができる 。   Next, the collection / treatment process will be described. The lining material removed by the water jet is scraped from the opening at the bottom of the chimney and collected in the accumulation pool. When the lining material collected in the accumulation pool has an unreacted part in the gelation, the gelation accelerator 2 is added to completely form the gel. As the gelation accelerator 2, a high molecular polymer is used. The gelled lining material is placed in a double sealed bag in the workplace and treated as specially controlled industrial waste. As a result of the gelation, the asbestos-containing lining material in the chimney can be efficiently removed, and the gelation can prevent asbestos dust from being scattered.

最後に煙突内の石綿含有ライニング材の除去状態を目視あるいは内視カメラ等で確認した後に、煙突の内壁に吹付け装置で飛散防止剤を吹付ける。この飛散防止剤は、通常の石綿飛散防止剤を使用する。飛散防止剤を吹付け装置で吹付けし、集塵装置を稼動した状態で2時間程度経過した後に環境測定をして石綿飛散量が基準値以下であればプラスチックシート等仮設養生を撤去し完了する。   Finally, after confirming the removal state of the asbestos-containing lining material in the chimney visually or with an endoscopic camera or the like, an anti-scattering agent is sprayed on the inner wall of the chimney with a spraying device. As this scattering inhibitor, a normal asbestos scattering inhibitor is used. After spraying anti-scattering agent with a spraying device, the environment is measured after about 2 hours with the dust collector operating, and if the asbestos scattering amount is below the standard value, the temporary curing such as plastic sheet is removed and completed. To do.

本発明により煙突以外の筒状構造物で内部に飛散性の物質、特に石綿等の有害なものが付着している時に、これをゲル状化することにより飛散を防止し、安全に除去できる可能性がある。 According to the present invention, when a dusty substance such as asbestos adheres inside a cylindrical structure other than a chimney, it can be gelled to prevent scattering and safely remove it. There is sex.

本発明を実施する場合の煙突内石綿含有ライニング材除去方法システムの全体を示す説明図である。It is explanatory drawing which shows the whole of the asbestos containing lining material removal method system in the case of implementing this invention. 煙突の縦方向の断面図とウォータージェットの説明図である。It is sectional drawing of the vertical direction of a chimney, and explanatory drawing of a water jet. 煙突の横方向の断面図とウォータージェットのノズルの説明図である。It is sectional drawing of the horizontal direction of a chimney, and explanatory drawing of the nozzle of a water jet. 本発明を実施する場合の煙突内石綿含有ライニング材除去方法システムフロー図である。It is a system flow figure of the asbestos content lining material removal method system in the case of carrying out the present invention.

符号の説明Explanation of symbols

1 煙突階上部クリーンルーム
2 ウィンチ
3 架台
4 外部足場
5 ウォータージェット
6 下部クリーンルーム
7 集積プール
8 負圧除塵装置
9 高圧ポンプ
10 加圧水ホース
DESCRIPTION OF SYMBOLS 1 Chimney floor upper clean room 2 Winch 3 Base 4 External scaffolding 5 Water jet 6 Lower clean room 7 Accumulation pool 8 Negative pressure dust removal device 9 High pressure pump
10 Pressurized water hose

Claims (1)

煙突等の筒状構造物の内部に内貼りされている石綿が含有されたライニング材をウォータージェットで除去時に隔離・密閉・負圧工程と湿潤化・飛散防止のための湿潤・飛散抑制剤吹付け工程と吹付けられた飛散抑制剤にゲル化促進剤1を高圧噴射にすることにより作用される架橋反応によるゲル状化除去工程と、除去したライニング材を回収しゲル化剤2により完全にゲル化して回収・処理する工程と除去後の煙突内壁に飛散防止剤を吹付ける工程を特徴とする煙突内石綿含有ライニング材除去方法。   When removing the lining material containing asbestos that is affixed to the inside of a cylindrical structure such as a chimney with a water jet, spraying a wetting / scattering inhibitor to prevent separation / sealing / negative pressure and wetting / scattering A gelation removal process by a crosslinking reaction that is effected by applying a high-pressure jet of the gelation accelerator 1 to the spraying step and the sprayed scattering inhibitor, and the removed lining material is completely recovered by the gelling agent 2 A method for removing an asbestos-containing lining material in a chimney comprising a step of gelling, collecting and treating, and a step of spraying an anti-scattering agent on the inner wall of the chimney after removal.
JP2008082397A 2008-03-27 2008-03-27 Removing method of chimney internal asbestos-containing lining material by gelling Pending JP2009235762A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011169486A (en) * 2010-02-16 2011-09-01 Eco-Bond Co Ltd Method and device of cleaning asbestos and the like for chimney
JP2014000735A (en) * 2012-06-19 2014-01-09 Ohbayashi Corp Method for decomposing structure
JP2017106258A (en) * 2015-12-10 2017-06-15 株式会社藤林商会 Sludge water disposal system
JP2018075547A (en) * 2016-11-11 2018-05-17 日立Geニュークリア・エナジー株式会社 Chip collection method during underwater cutting
FR3142685A1 (en) * 2022-12-06 2024-06-07 Entreprise Moderne de Terrassement et d'Agregats RECOVERY OF ASBESTOS WASTE

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011169486A (en) * 2010-02-16 2011-09-01 Eco-Bond Co Ltd Method and device of cleaning asbestos and the like for chimney
JP2014000735A (en) * 2012-06-19 2014-01-09 Ohbayashi Corp Method for decomposing structure
JP2017106258A (en) * 2015-12-10 2017-06-15 株式会社藤林商会 Sludge water disposal system
JP2018075547A (en) * 2016-11-11 2018-05-17 日立Geニュークリア・エナジー株式会社 Chip collection method during underwater cutting
FR3142685A1 (en) * 2022-12-06 2024-06-07 Entreprise Moderne de Terrassement et d'Agregats RECOVERY OF ASBESTOS WASTE
WO2024121499A1 (en) * 2022-12-06 2024-06-13 Entreprise Moderne de Terrassement et d'Agregats Recycling asbestos waste

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