JP2018076696A - Method for removing fibrous material containing cementitious member - Google Patents
Method for removing fibrous material containing cementitious member Download PDFInfo
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本発明は、繊維状物質含有セメント系部材の除去方法に関する。 The present invention relates to a method for removing a fibrous material-containing cement-based member.
既設建築物などにおいて、金属製の基材（例えばＨ形鋼）の耐火被覆として、当該基材の表面に石綿（アスベスト）を含有する石綿耐火被覆（繊維状物質含有セメント系部材の一例）が施されていることがある。このような石綿耐火被覆を基材から除去する場合、作業者が皮スキ（スクレーパー）などの除去工具を石綿耐火被覆に差し込んで、手作業により徐々に剥離（除去）している（例えば、特許文献１参照）。 In an existing building or the like, an asbestos fireproof coating (an example of a fibrous material-containing cement-based member) containing asbestos (asbestos) on the surface of the base material is used as a fireproof coating on a metal base material (for example, H-shaped steel). May have been applied. When removing such an asbestos fireproof coating from a base material, an operator inserts a removal tool such as a leather scraper into the asbestos fireproof coating, and gradually peels (removes) it manually (for example, a patent) Reference 1).
石綿耐火被覆は、石綿繊維とセメントの複合体であり、固くて石綿繊維が緻密に絡まり合っているため、除去工具の先端がなかなか突き刺さらない。このため、石綿耐火被覆を除去するには、時間と労力を要し作業効率が悪かった。また、作業の際に音や振動が発生するため作業時間が限定される（例えば夜間作業になる）という問題があった。 The asbestos fireproof coating is a composite of asbestos fibers and cement, and since the asbestos fibers are hard and densely entangled, the tip of the removal tool does not easily stick. For this reason, it took time and labor to remove the asbestos fireproof coating, and the work efficiency was poor. In addition, there is a problem that work time is limited (for example, night work) because sound and vibration are generated during the work.
本発明は、かかる課題に鑑みてなされたものであって、その目的とするところは、繊維状物質含有セメント系部材を基材から簡易に除去できるようにし、作業効率の向上を図ることにある。 The present invention has been made in view of such problems, and its object is to facilitate removal of the fibrous material-containing cement-based member from the base material and to improve work efficiency. .
かかる目的を達成するため、本発明の繊維状物質含有セメント系部材の除去方法は、基材の表面に設けられた繊維状物質含有セメント系部材に液体を浸透させて、前記繊維状物質含有セメント系部材を脆弱化させる脆弱化工程と、脆弱化した前記繊維状物質含有セメント系部材を切削工具で切削して、前記繊維状物質含有セメント系部材に切削部を形成する切削工程と、前記切削部に除去工具を挿入して、前記基材から前記繊維状物質含有セメント系部材を除去する除去工程と、を有することを特徴とする。
このような繊維状物質含有セメント系部材の除去方法によれば、作業効率の向上を図ることができる。
In order to achieve this object, the method for removing a fibrous material-containing cement-based member of the present invention is characterized in that a liquid is infiltrated into a fibrous material-containing cement-based member provided on the surface of a substrate, and the fibrous material-containing cement is used. A weakening step of weakening the system member, a cutting step of cutting the weakened fibrous material-containing cement-based member with a cutting tool to form a cutting portion in the fibrous material-containing cement-based member, and the cutting And a removal step of removing the fibrous substance-containing cement-based member from the base material by inserting a removal tool into the part.
According to such a method for removing a fibrous material-containing cement-based member, it is possible to improve work efficiency.
かかる繊維状物質含有セメント系部材の除去方法であって、前記切削工程の後、前記繊維状物質含有セメント系部材及び前記切削部に冷媒を吹付け又は流入させて、脆弱化した前記繊維状物質含有セメント系部材を凍結させる凍結工程を有することが望ましい。
このような繊維状物質含有セメント系部材の除去方法によれば、基材と繊維状物質含有セメント系部材との界面を剥離させることができる。
A method for removing a fibrous material-containing cement-based member, wherein after the cutting step, the fibrous material is weakened by blowing or flowing a refrigerant into the fibrous material-containing cement-based member and the cutting portion. It is desirable to have a freezing step for freezing the containing cementitious member.
According to such a method for removing a fibrous substance-containing cement-based member, the interface between the substrate and the fibrous substance-containing cement-based member can be peeled off.
かかる繊維状物質含有セメント系部材の除去方法であって、前記切削工程と前記凍結工程との間に、前記繊維状物質含有セメント系部材及び前記切削部を湿潤させる湿潤工程をさらに有することが望ましい。
このような繊維状物質含有セメント系部材の除去方法によれば、確実に湿潤させることができる。
It is desirable that the method for removing a fibrous substance-containing cement-based member further includes a wetting step of wetting the fibrous substance-containing cement-based member and the cutting portion between the cutting step and the freezing step. .
According to such a method for removing a fibrous material-containing cement-based member, it can be reliably wetted.
かかる繊維状物質含有セメント系部材の除去方法であって、前記除去工程は、前記凍結工程において凍結した前記繊維状物質含有セメント系部材が溶融した後に行うことが望ましい。
このような繊維状物質含有セメント系部材の除去方法によれば、繊維状物質含有セメント系部材を基材から容易に除去することができる。
In this method of removing a fibrous material-containing cement-based member, it is preferable that the removing step is performed after the fibrous material-containing cement-based member frozen in the freezing step is melted.
According to such a method for removing a fibrous substance-containing cement-based member, the fibrous substance-containing cement-based member can be easily removed from the substrate.
かかる繊維状物質含有セメント系部材の除去方法であって、脆弱化した前記繊維状物質含有セメント系部材の硬度に応じて、使用する前記切削工具を選定することが望ましい。
このような繊維状物質含有セメント系部材の除去方法によれば、容易に切削部を形成することができ、作業効率をさらに向上させることができる。
In this method for removing a fibrous material-containing cement-based member, it is desirable to select the cutting tool to be used according to the hardness of the weakened fibrous material-containing cement-based member.
According to such a method for removing a fibrous material-containing cement-based member, it is possible to easily form a cutting portion and further improve work efficiency.
かかる繊維状物質含有セメント系部材の除去方法であって、前記脆弱化工程において、前記液体は、前記切削部の形成箇所を含む所定範囲に浸透させることが望ましい。
このような繊維状物質含有セメント系部材の除去方法によれば、作業効率を上げることができ、また、液体の使用量の低減を図ることできる。
In this method of removing a fibrous material-containing cement-based member, it is preferable that the liquid penetrates a predetermined range including a formation portion of the cutting portion in the weakening step.
According to such a method for removing a fibrous material-containing cement-based member, the working efficiency can be increased and the amount of liquid used can be reduced.
かかる繊維状物質含有セメント系部材の除去方法であって、前記脆弱化工程において、前記液体を前記繊維状物質含有セメント系部材に浸透させてから３０分以上放置することが望ましい。
このような繊維状物質含有セメント系部材の除去方法によれば、切削部を形成しやすくすることができる。
In this method of removing a fibrous material-containing cement-based member, it is desirable that in the embrittlement step, the liquid is allowed to permeate the fibrous material-containing cement-based member and then left for 30 minutes or more.
According to such a method for removing a fibrous material-containing cement-based member, it is possible to easily form a cutting portion.
かかる繊維状物質含有セメント系部材の除去方法であって、前記液体は、濃度が５ｗｔ％以上１５ｗｔ％以下の有機酸溶液であることが望ましい。
このような繊維状物質含有セメント系部材の除去方法によれば、繊維状物質含有セメント系部材を確実に脆弱化させることができる。
In this method for removing a fibrous material-containing cement-based member, the liquid is preferably an organic acid solution having a concentration of 5 wt% or more and 15 wt% or less.
According to such a method for removing a fibrous substance-containing cement-based member, the fibrous substance-containing cement-based member can be reliably weakened.
かかる繊維状物質含有セメント系部材の除去方法であって、前記基材は金属製であり、前記液体は防錆材を含有することが望ましい。
このような繊維状物質含有セメント系部材の除去方法によれば、基材が錆びるのを防止することができる。
In this method of removing a fibrous material-containing cement-based member, it is preferable that the base material is made of metal and the liquid contains a rust preventive material.
According to such a method for removing a fibrous material-containing cement-based member, the base material can be prevented from being rusted.
かかる繊維状物質含有セメント系部材の除去方法であって、前記液体は増粘剤を含有することが望ましい。 In this method for removing a fibrous material-containing cement-based member, it is preferable that the liquid contains a thickener.
このような繊維状物質含有セメント系部材の除去方法によれば、滴りを低減することができ、容易に散布することができる。 According to such a method for removing a fibrous material-containing cement-based member, dripping can be reduced and it can be easily sprayed.
本発明によれば、作業効率の向上を図ることが可能である。 According to the present invention, it is possible to improve work efficiency.
以下、本発明の一実施形態について図面を参照しつつ説明する。以下の実施形態では、鉄骨梁（基材）の表面に施された石綿耐火被覆（繊維状物質含有セメント系部材）を除去する場合について説明する。 Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The following embodiment demonstrates the case where the asbestos fireproof coating (fibrous substance containing cement type member) given to the surface of a steel beam (base material) is removed.
＝＝＝実施形態＝＝＝
＜＜鉄骨梁の構成について＞＞
図１は、表面に耐火被覆３０を施した鉄骨梁１０の構成の一例を示す図である。なお、図１は鉄骨梁１０の幅方向（長手方向に垂直な方向）に沿った断面図である。
=== Embodiment ===
<< About the structure of steel beams >>
FIG. 1 is a diagram showing an example of the configuration of a steel beam 10 having a fireproof coating 30 on the surface. FIG. 1 is a cross-sectional view along the width direction (direction perpendicular to the longitudinal direction) of the steel beam 10.
図１に示すように、本実施形態の鉄骨梁１０（基材に相当）は、スラブ２０の下に設けられたＨ形鋼であり、上下に間隔を隔てるとともに互いに対向する板状の上フランジ１２及び下フランジ１４と、上フランジ１２と下フランジ１４とを、幅方向の中央にて上下に繋ぐ板状のウェブ１６とを有している。この鉄骨梁１０のうちスラブ２０との接続面（上フランジ１２の上面）を除く各表面には、耐火被覆３０が吹付けなどによって設けられている。本実施形態の耐火被覆３０は、石綿（アスベスト）を含有する石綿耐火被覆であり、石綿繊維とセメントの複合体である。すなわち、耐火被覆３０は、繊維状物質含有セメント系部材に相当する。 As shown in FIG. 1, a steel beam 10 (corresponding to a base material) of the present embodiment is an H-shaped steel provided under a slab 20, and is a plate-like upper flange that is spaced apart vertically and faces each other. 12 and a lower flange 14, and a plate-like web 16 that connects the upper flange 12 and the lower flange 14 up and down at the center in the width direction. A fireproof coating 30 is provided by spraying or the like on each surface of the steel beam 10 except for the connection surface with the slab 20 (the upper surface of the upper flange 12). The fireproof coating 30 of this embodiment is an asbestos fireproof coating containing asbestos (asbestos), and is a composite of asbestos fibers and cement. That is, the fireproof coating 30 corresponds to a fibrous material-containing cement-based member.
このような耐火被覆３０を鉄骨梁１０から除去する場合、一般的に、皮スキなどの鋭利な除去工具を耐火被覆３０の表面に差し込んで、そこから除去工具を移動させて徐々に耐火被覆３０を剥離除去している。しかし、石綿繊維とセメントの複合体である耐火被覆３０は、石綿が緻密に絡み合っているため、除去工具（皮スキなど）の先端が突き刺さりにくい。このため、鉄骨梁１０から耐火被覆３０を除去する作業は、時間と労力を要し作業効率が悪かった。また、作業の際に音や振動が発生するため作業時間が限定される（例えば夜間作業になる）という問題があった。また、作業者の負担を和らげ作業効率を高めるため電動チッパー等の道具を用いることもあるが、この場合も、騒音や振動が発生するという問題があった。 When removing such a refractory coating 30 from the steel beam 10, generally, a sharp removal tool such as leather is inserted into the surface of the refractory coating 30, and the removal tool is moved from there to gradually move the refractory coating 30. Is removed. However, the fireproof coating 30, which is a composite of asbestos fibers and cement, is difficult to pierce the tip of a removal tool (such as leather skin) because asbestos is intertwined closely. For this reason, the work of removing the fireproof coating 30 from the steel beam 10 requires time and labor, and the work efficiency is poor. In addition, there is a problem that work time is limited (for example, night work) because sound and vibration are generated during the work. In addition, tools such as an electric chipper may be used to alleviate the burden on the operator and increase the work efficiency. In this case, however, there is a problem that noise and vibration are generated.
そこで、本実施形態では、耐火被覆３０を手作業で簡易に除去できるようにし、作業効率の向上を図っている。 Therefore, in the present embodiment, the fireproof coating 30 can be easily removed manually to improve work efficiency.
＜＜耐火被覆の除去方法について＞＞
図２は、本実施形態の耐火被覆除去方法のフロー図であり、図３Ａ〜図３Ｆは、各工程における状態を示す断面図である。
<< About the removal method of fireproof coating >>
FIG. 2 is a flowchart of the fireproof covering removing method of the present embodiment, and FIGS. 3A to 3F are cross-sectional views showing states in the respective steps.
本実施形態では、後述するように、耐火被覆３０の表面に溝（切り込み）を形成する。そこで、まず、耐火被覆３０に切り込みを入れる箇所の見極めを行う（図２のＳ１０）。切り込みを入れる箇所は、耐火被覆３０を大きな塊（ブロック）で除去しやすくできるような場所とすることが望ましい。図３Ａの破線は、本実施形態おける塊の境界部分を仮想的に示したものである。切り込みを入れる箇所にはマーカーなどで場所を示すようにするとよい。 In the present embodiment, as will be described later, a groove (cut) is formed on the surface of the fireproof coating 30. Therefore, first, the location where the cut is made in the fireproof coating 30 is determined (S10 in FIG. 2). It is desirable that the notch is made a place where the fireproof coating 30 can be easily removed by a large block (block). The broken line in FIG. 3A virtually shows the boundary portion of the lump in the present embodiment. It is good to show a place with a marker etc. in the place to cut.
次に、切り込みを入れる箇所の近傍（図３Ｂの灰色の楕円で示す部位：切削部を含む所定範囲に相当）に有機酸溶液（液体に相当）を散布し（図２のＳ１１）、３０分以上そのまま放置して、耐火被覆３０に有機酸溶液を浸透させる。なお、散布の方法は、吹付け（噴霧）、流し掛け、塗布、注入など何れでもよい。これにより、切り込みを入れる箇所の近傍の耐火被覆３０が、有機酸溶液によって脆弱化する。すなわちステップＳ１１は脆弱化工程に相当する。 Next, an organic acid solution (corresponding to a liquid) is sprayed in the vicinity of the portion to be cut (portion indicated by a gray ellipse in FIG. 3B: corresponding to a predetermined range including the cutting portion) (S11 in FIG. 2), for 30 minutes. The organic acid solution is infiltrated into the fireproof coating 30 by leaving it as it is. In addition, spraying (spraying), pouring, application | coating, injection | pouring, etc. may be sufficient as the spraying method. Thereby, the fireproof coating 30 in the vicinity of the location where the cut is made is weakened by the organic acid solution. That is, step S11 corresponds to a weakening process.
本実施形態では、有機酸溶液としてグリコール酸を用いている。グリコール酸は、有機酸の一種であり、セメント水和物を分解させる働きがある。有機酸溶液（グリコール酸）の濃度は５ｗｔ％以上１５ｗｔ％以下がよい。このような有機酸溶液を耐火被覆３０に散布することにより、耐火被覆３０のセメント成分（セメント水和物）を脆弱化させることができる。また、有機酸溶液の散布によって耐火被覆３０は湿潤化するので、後述する切削時などにおいて石綿の飛散を抑制することもできる（繊維の飛散抑制効果がある）。 In this embodiment, glycolic acid is used as the organic acid solution. Glycolic acid is a kind of organic acid and has a function of decomposing cement hydrate. The concentration of the organic acid solution (glycolic acid) is preferably 5 wt% or more and 15 wt% or less. By dispersing such an organic acid solution on the fireproof coating 30, the cement component (cement hydrate) of the fireproof coating 30 can be weakened. In addition, since the fireproof coating 30 is moistened by the spraying of the organic acid solution, it is possible to suppress the asbestos scattering at the time of cutting, which will be described later (the effect of suppressing fiber scattering).
また、有機酸溶液には、防錆材が添加されていることが望ましい。これにより、鉄骨梁１０が錆びるのを防止することができる。 Moreover, it is desirable that a rust preventive material is added to the organic acid solution. Thereby, it can prevent that the steel beam 10 rusts.
さらに、有機酸溶液には、増粘剤が添加されていることが望ましい。増粘剤を添加していない場合、一定量以上散布すると滴り落ちるのに対し、増粘剤を添加した場合、滴りを低減できる。よって、例えば、上フランジ１２の下面に施された耐火被覆３０にも容易に散布することができる。また、これにより、湿潤効果を促進させることができ、耐火被覆３０除去時の繊維の飛散抑制効果も発揮できる。 Furthermore, it is desirable that a thickener is added to the organic acid solution. When a thickener is not added, dripping can occur when sprayed over a certain amount, whereas when a thickener is added, dripping can be reduced. Therefore, for example, it can be easily sprayed on the fireproof coating 30 applied to the lower surface of the upper flange 12. In addition, this makes it possible to promote the wetting effect and to exert the fiber scattering suppression effect when removing the fireproof coating 30.
本実施形態では、耐火被覆３０のうち切り込みを入れる箇所の近傍を脆弱化させているので、耐火被覆３０の表面全体を脆弱化させる場合と比べて、作業効率を上げることができ、また、有機酸溶液の使用量の低減を図ることができる。 In this embodiment, since the vicinity of the portion to be cut is weakened in the fireproof coating 30, work efficiency can be increased compared to the case where the entire surface of the fireproof coating 30 is weakened. The amount of the acid solution used can be reduced.
それから、切削工具（例えば、円形カッターや引っ掻き工具）を用いて、有機酸溶液を散布した箇所の耐火被覆３０（ここでは図３Ｃの矢印で示す部分）を深さ方向に切削し、溝を掘る（図２のＳ１２：切削工程に相当）。これにより、耐火被覆３０の深部まで溝（以下、切削部ともいう）が形成される。この際に用いる切削工具は、有機酸により脆弱化した耐火被覆３０の硬度に応じて選定するとよい。例えば、硬度が所定値より低い場合（柔らかい場合）には円形カッター（丸鋸）を用いて耐火被覆３０を押し切り、硬度が所定値より高い場合（硬い場合）には引っ掻き工具を用いて耐火被覆３０を引っ掻く（引き裂く）などすればよい。このように、耐火被覆３０に切削部を形成する際に用いる切削工具を、耐火被覆３０の硬度に応じて適宜選定することにより、容易に切削部を形成することができ、作業効率を更に向上させることができる。 Then, using a cutting tool (for example, a circular cutter or a scratching tool), the fireproof coating 30 (here, the portion indicated by the arrow in FIG. 3C) where the organic acid solution has been sprayed is cut in the depth direction to dig a groove. (S12 in FIG. 2: equivalent to the cutting process). Thereby, a groove | channel (henceforth a cutting part) is formed to the deep part of the fireproof coating 30. FIG. The cutting tool used at this time may be selected according to the hardness of the fireproof coating 30 weakened by an organic acid. For example, when the hardness is lower than a predetermined value (when soft), the fireproof coating 30 is pushed through using a circular cutter (circular saw), and when the hardness is higher than a predetermined value (when hard), the fireproof coating is used with a scratching tool. For example, 30 may be scratched (teared). Thus, the cutting part can be easily formed by appropriately selecting the cutting tool used when forming the cutting part on the fireproof coating 30 according to the hardness of the fireproof coating 30, and the working efficiency is further improved. Can be made.
切削部を形成した後、図３Ｄに示すように、除去範囲全体の耐火被覆３０の表面から水（スチーム）を散布する。耐火被覆３０には切削部が形成されているので、切削部にも水が流入する。このようにして、耐火被覆３０及び切削部を、水（スチーム）によって湿潤させる（図２のＳ１３：湿潤工程に相当）。なお、ここでは水（スチーム）を用いて耐火被覆３０を湿潤させたが、水以外の液体（例えば、グリコール酸などの有機酸溶液）を用いてもよい。 After forming the cut portion, as shown in FIG. 3D, water (steam) is sprayed from the surface of the fireproof coating 30 in the entire removal range. Since the cutting part is formed in the fireproof coating 30, water also flows into the cutting part. In this way, the fireproof coating 30 and the cut portion are wetted with water (steam) (corresponding to S13 in FIG. 2: wet process). Here, the fireproof coating 30 is wetted using water (steam), but a liquid other than water (for example, an organic acid solution such as glycolic acid) may be used.
耐火被覆３０が十分湿潤したら、図３Ｅに示すように、冷媒（本実施形態では液体窒素）を吹付け、あるいは、流入させて水を凍結させる（図２のＳ１４：凍結工程に相当）。これにより、耐火被覆３０に含まれる水の体積（換言すると耐火被覆３０の体積）が膨張する。そして、凍結した耐火被覆３０が溶融するまで待つ。このようにすることで、耐火被覆３０と鉄骨梁１０との界面において相間剥離（界面剥離）が起こる。 When the fireproof coating 30 is sufficiently moistened, as shown in FIG. 3E, a coolant (in this embodiment, liquid nitrogen) is sprayed or introduced to freeze the water (S14 in FIG. 2: equivalent to the freezing step). Thereby, the volume of water contained in the fireproof coating 30 (in other words, the volume of the fireproof coating 30) expands. And it waits until the frozen fireproof coating 30 fuse | melts. By doing so, phase separation (interface separation) occurs at the interface between the fireproof coating 30 and the steel beam 10.
その後、切削部に除去工具（皮スキなど）を挿入し、図３Ｆに示すように、耐火被覆３０を除去する（図２のＳ１５：除去工程に相当）。本実施形態では、前述したステップＳ１４にて、耐火被覆３０と鉄骨梁１０との界面で相間剥離が起こっているため、除去工具を切削部に挿入して僅かな力を加えるだけで、耐火被覆３０を塊（ブロック）として容易に鉄骨梁１０から剥離除去することができる。 Thereafter, a removal tool (such as a leather skin) is inserted into the cutting portion, and the fireproof coating 30 is removed as shown in FIG. 3F (corresponding to S15 in FIG. 2: removal step). In the present embodiment, since the phase separation occurs at the interface between the fireproof coating 30 and the steel beam 10 in the above-described step S14, the fireproof coating can be obtained by inserting a removal tool into the cutting portion and applying a slight force. 30 can be easily peeled and removed from the steel beam 10 as a block (block).
なお、ステップＳ１１において、有機酸溶液をたっぷり散布した場合（十分湿潤している場合）、ステップＳ１３（湿潤工程）を省略してもよい。 In Step S11, when the organic acid solution is sufficiently sprayed (when sufficiently wet), Step S13 (wetting step) may be omitted.
また、耐火被覆３０に切削部を形成した後（ステップＳ１２の後）、脆弱化した耐火被覆３０を容易に除去できそうな場合は、ステップＳ１３及びステップＳ１４を省略してステップＳ１５を実行してもよい。 In addition, after forming the cutting portion on the fireproof coating 30 (after step S12), if it is likely that the weakened fireproof coating 30 can be easily removed, step S13 and step S14 are omitted and step S15 is executed. Also good.
以上、説明したように、本実施形態の耐火被覆除去方法は、鉄骨梁１０の表面に設けられた耐火被覆３０に有機酸溶液（グリコール酸）を浸透させて、耐火被覆３０を脆弱化させるステップＳ１１（脆弱化工程）と、脆弱化した耐火被覆３０を切削工具で切削して、耐火被覆３０に切削部を形成するステップＳ１２（切削工程）と、切削部に除去工具を挿入して、鉄骨梁１０から耐火被覆３０を除去するステップＳ１５（除去工程）とを有している。これにより、耐火被覆３０を手作業で容易に剥離することができ、作業効率の向上を図ることができる。また、騒音や振動が発生しないので、時間帯を気にせずに作業することができる。 As described above, the fireproof coating removing method of the present embodiment is a step of causing the fireproof coating 30 to be weakened by infiltrating the organic acid solution (glycolic acid) into the fireproof coating 30 provided on the surface of the steel beam 10. S11 (weakening process), step S12 (cutting process) in which the weakened fireproof coating 30 is cut with a cutting tool to form a cutting part on the fireproof coating 30, and a removal tool is inserted into the cutting part. Step S15 (removal process) for removing the fireproof coating 30 from the beam 10. Thereby, the fireproof coating 30 can be easily peeled manually, and the work efficiency can be improved. In addition, since no noise or vibration is generated, it is possible to work without worrying about the time zone.
＝＝＝その他の実施形態について＝＝＝
上記実施形態は、本発明の理解を容易にするためのものであり、本発明を限定して解釈するためのものではない。本発明は、その趣旨を逸脱することなく、変更、改良され得ると共に、本発明にはその等価物が含まれることはいうまでもない。特に、以下に述べる実施形態であっても、本発明に含まれるものである
態であっても、本発明に含まれるものである。
=== About Other Embodiments ===
The above embodiment is for facilitating the understanding of the present invention, and is not intended to limit the present invention. The present invention can be changed and improved without departing from the gist thereof, and it is needless to say that the present invention includes equivalents thereof. In particular, the embodiments described below and the embodiments included in the present invention are also included in the present invention.
＜基材について＞
前述の実施形態では、耐火被覆３０が設けられた対象物（基材）を鉄骨梁１０としていたが、これに限らない。例えば、柱や天井や壁体などでもよい。また、前述の実施形態の鉄骨梁１０はＨ形鋼であったが、Ｉ形鋼やＴ形鋼であってもよい。また、基材は鋼材には限られず、例えば、ステンレスやアルミニウム合金などの金属材料を用いた部材であってもよい。
<About the base material>
In the above-described embodiment, the object (base material) provided with the fireproof coating 30 is the steel beam 10, but is not limited thereto. For example, a pillar, a ceiling, or a wall may be used. Moreover, although the steel beam 10 of the above-mentioned embodiment was H-shaped steel, I-shaped steel or T-shaped steel may be used. The base material is not limited to steel, and may be a member using a metal material such as stainless steel or aluminum alloy.
＜耐火被覆について＞
前述の実施形態では、耐火被覆３０は吹付けで形成されていたが、吹付け以外の方法で施工された耐火被覆材であってもよい。
<About fireproof coating>
In the above-described embodiment, the fireproof coating 30 is formed by spraying, but may be a fireproof coating material applied by a method other than spraying.
また、前述の実施形態では、耐火被覆３０は石綿（アスベスト）を含有していたが、石綿以外の繊維状物質を含有していてもよい。例えば、ロックウール、ガラス繊維、金属繊維などを含有していてもよい。 Moreover, in the above-mentioned embodiment, although the fireproof coating 30 contained asbestos (asbestos), you may contain fibrous substances other than asbestos. For example, you may contain rock wool, glass fiber, a metal fiber, etc.
また、耐火被覆以外の用途の部材（例えば防音用に設けられた部材）に対して本実施形態の除去方法を適用してもよい。 Moreover, you may apply the removal method of this embodiment with respect to members (for example, the member provided for soundproofing) of uses other than fireproof coating.
＜有機酸溶液について＞
前述の実施形態では、耐火被覆３０を脆弱化させる有機酸溶液としてグリコール酸を用いていたが、これには限らない。例えばクエン酸を用いてもよい。また、有機酸溶液以外の液体（例えば水）を用いても耐火被覆３０を脆弱化させることが可能である。ただし、本実施形態のように有機酸溶液を用いると、短時間で効率よく耐火被覆３０を脆弱化させることができ、ステップＳ１２において切り込みが入れやすくなる（切削部を形成しやすい）。
<About organic acid solution>
In the above-described embodiment, glycolic acid is used as the organic acid solution that weakens the fireproof coating 30, but this is not a limitation. For example, citric acid may be used. Moreover, it is possible to weaken the fireproof coating 30 by using a liquid (for example, water) other than the organic acid solution. However, when an organic acid solution is used as in the present embodiment, the fireproof coating 30 can be efficiently weakened in a short time, and incision can be easily made in step S12 (a cutting part can be easily formed).
＜冷媒について＞
前述の実施形態では、冷媒として液体窒素を用いていたが、これには限られない。例えば、液体炭素を用いてもよい。
<About refrigerant>
In the above-described embodiment, liquid nitrogen is used as the refrigerant, but the present invention is not limited to this. For example, liquid carbon may be used.
１０ 鉄骨梁（基材）
１２ 上フランジ
１４ 下フランジ
１６ ウェブ
３０ 耐火被覆（繊維状物質含有セメント系部材）
10 Steel beam (base material)
12 Upper flange 14 Lower flange 16 Web 30 Fireproof coating (fibrous material-containing cement-based member)
Claims (10)
脆弱化した前記繊維状物質含有セメント系部材を切削工具で切削して、前記繊維状物質含有セメント系部材に切削部を形成する切削工程と、
前記切削部に除去工具を挿入して、前記基材から前記繊維状物質含有セメント系部材を除去する除去工程と、
を有することを特徴とする繊維状物質含有セメント系部材の除去方法。 A weakening step of impregnating the fibrous material-containing cement-based member by impregnating the liquid into the fibrous material-containing cement-based member provided on the surface of the substrate;
Cutting the brittle fibrous material-containing cement-based member with a cutting tool to form a cutting portion in the fibrous material-containing cement-based member; and
A removal step of inserting a removal tool into the cutting part and removing the fibrous substance-containing cement-based member from the base material;
A method for removing a fibrous material-containing cement-based member, comprising:
前記切削工程の後、前記繊維状物質含有セメント系部材及び前記切削部に冷媒を吹付け又は流入させて、脆弱化した前記繊維状物質含有セメント系部材を凍結させる凍結工程を有することを特徴とする繊維状物質含有セメント系部材の除去方法。 A method for removing a fibrous material-containing cement-based member according to claim 1,
It has a freezing step of freezing the brittle fibrous material-containing cement-based member by blowing or flowing a refrigerant into the fibrous material-containing cement-based member and the cutting portion after the cutting step. To remove the fibrous material-containing cement-based member.
前記切削工程と前記凍結工程との間に、前記繊維状物質含有セメント系部材及び前記切削部を湿潤させる湿潤工程をさらに有することを特徴とする繊維状物質含有セメント系部材の除去方法。 A method for removing a fibrous material-containing cement-based member according to claim 2,
The method for removing a fibrous material-containing cement-based member, further comprising a wetting step of wetting the fibrous material-containing cement-based member and the cutting portion between the cutting step and the freezing step.
前記除去工程は、前記凍結工程において凍結した前記繊維状物質含有セメント系部材が溶融した後に行う
ことを特徴とする繊維状物質含有セメント系部材の除去方法。 A method for removing a fibrous material-containing cement-based member according to claim 2 or 3,
The method for removing a fibrous material-containing cement-based member, wherein the removing step is performed after the fibrous material-containing cement-based member frozen in the freezing step is melted.
脆弱化した前記繊維状物質含有セメント系部材の硬度に応じて、使用する前記切削工具を選定する、
ことを特徴とする繊維状物質含有セメント系部材の除去方法。 A method for removing a fibrous material-containing cement-based member according to any one of claims 1 to 4,
According to the hardness of the weakened fibrous material-containing cement-based member, the cutting tool to be used is selected,
A method for removing a fibrous material-containing cement-based member.
前記脆弱化工程において、前記液体は、前記切削部の形成箇所を含む所定範囲に浸透させる、
ことを特徴とする繊維状物質含有セメント系部材の除去方法。 A method for removing a fibrous material-containing cement-based member according to any one of claims 1 to 5,
In the weakening step, the liquid penetrates into a predetermined range including the formation part of the cutting part.
A method for removing a fibrous material-containing cement-based member.
前記脆弱化工程において、前記液体を前記繊維状物質含有セメント系部材に浸透させてから３０分以上放置する、
ことを特徴とする繊維状物質含有セメント系部材の除去方法。 A method for removing a fibrous material-containing cement-based member according to any one of claims 1 to 6,
In the embrittlement step, the liquid is allowed to permeate the fibrous material-containing cement-based member and then left for 30 minutes or more.
A method for removing a fibrous material-containing cement-based member.
前記液体は、濃度が５ｗｔ％以上１５ｗｔ％以下の有機酸溶液である、
ことを特徴とする繊維状物質含有セメント系部材の除去方法。 A method for removing a fibrous material-containing cement-based member according to any one of claims 1 to 7,
The liquid is an organic acid solution having a concentration of 5 wt% to 15 wt%.
A method for removing a fibrous material-containing cement-based member.
前記基材は金属製であり、
前記液体は防錆材を含有する、
ことを特徴とする繊維状物質含有セメント系部材の除去方法。 A method for removing a fibrous material-containing cement-based member according to any one of claims 1 to 8,
The substrate is made of metal;
The liquid contains a rust inhibitor;
A method for removing a fibrous material-containing cement-based member.
前記液体は増粘剤を含有する、
ことを特徴とする繊維状物質含有セメント系部材の除去方法。 A method for removing a fibrous material-containing cement-based member according to any one of claims 1 to 9,
The liquid contains a thickener;
A method for removing a fibrous material-containing cement-based member.
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