JP2020018974A - Method for repairing water shielding sheet - Google Patents
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本発明は、管理型廃棄物処分場等において、遮水シートによる遮水構造を構築する際に、現地に搬入された遮水シート、もしくは気中部に敷設した遮水シートの一部が損傷している場合の補修方法に関するものである。 In the present invention, when constructing a water-blocking structure using a water-blocking sheet in a managed waste disposal site or the like, the water-blocking sheet carried to the site or a part of the water-blocking sheet laid in the aerial part may be damaged. It is about repair method when there is.
一般廃棄物や、産業廃棄物を焼却施設にて燃焼させた残渣である焼却灰等は、陸上もしくは海面の管理型廃棄物処分場に埋め立てられている。管理型廃棄物処分場（以下、処分場という）は、処分場内の水が処分場外に漏出しないように処分場を構成する、例えば傾斜堤護岸や混成堤護岸の側面及び当該処分場の底面に、遮水シートによる遮水構造を構築する必要がある。当該遮水シートの素材は、高分子材（例えば、ポリエチレンや塩化ビニル）である。また、遮水シートにおいて、同材質同士は、気中において熱溶着にて接合することが可能である。遮水シートは、製造工場にて幅約２ｍの原反にて製造される。一般的な施工方法は、工事現場（敷設現場）の近隣の陸上ヤード、もしくは広幅加工台船（艤装した大型平台船）にて、この幅２ｍの原反を、例えば１５本熱溶着にて接合することで、幅約３０ｍのシートパネルを製作する。そして、このシートパネルを複数枚海上に引き出して、これらシートパネルの端部同士を、海上にて同様に溶着して一体化した後、沈設して敷設する。 General waste and incinerated ash, which are residues generated by burning industrial waste in incineration facilities, are landfilled in land-based or sea-level managed waste disposal sites. A managed waste disposal site (hereinafter referred to as a disposal site) is to constitute a disposal site so that water in the disposal site does not leak out of the disposal site, for example, on the side of a sloped embankment or a mixed embankment and on the bottom of the disposal site. Therefore, it is necessary to construct a water-blocking structure using a water-blocking sheet. The material of the waterproof sheet is a polymer material (for example, polyethylene or vinyl chloride). Further, in the impermeable sheet, the same material can be joined by heat welding in the air. The seepage control sheet is manufactured at a manufacturing plant on a raw material having a width of about 2 m. A common construction method is to bond this 2m wide raw material by, for example, 15 pieces of heat welding at a land yard near the construction site (laying site) or a wide processing barge (equipped large flat barge). As a result, a sheet panel having a width of about 30 m is manufactured. Then, a plurality of the sheet panels are drawn out to the sea, and the ends of the sheet panels are similarly welded and integrated at the sea, then laid down and laid.
ところで、搬入された遮水シートの原反の一部に、かすり傷や引っ掻き傷等の損傷部がある場合、当該損傷部が、敷設後の外部入力に対する弱化部となり、同箇所から遮水シートが引っ張られ、引き裂かれることにより遮水シートの品質が維持できなくなる可能性がある。このために、品質不適品として製造業者に原反を返却する、もしくは損傷部を切断除去して、その損傷部を使用しない、などの措置がとられている。しかしながら、措置後（損傷部を切断除去後）の遮水シートの長さが、必要長と比較して不足する場合には、納入された遮水シートの損傷部の品質を復旧して使用せざるを得ない場合が発生する。また敷設後の遮水シートに、例えばシート上面に作業機材等が接触して、かすり傷や引っ掻き傷、または貫通孔を含めた裂傷が生じた場合には、遮水シートの遮水性を確保するために、現地にてその損傷部を補修する必要があった。 By the way, when a part of the raw sheet of the water-impervious sheet carried in has a damaged part such as a scratch or a scratch, the damaged part becomes a weakened part against external input after laying, and the water-impervious sheet from the same place May be pulled and torn, whereby the quality of the impermeable sheet may not be maintained. For this purpose, measures have been taken, such as returning the raw material to the manufacturer as an unsuitable product, or cutting and removing the damaged portion and not using the damaged portion. However, if the length of the impermeable sheet after the measures (after cutting and removing the damaged portion) is insufficient compared to the required length, restore the quality of the damaged portion of the delivered impermeable sheet and use it. In some cases, there is no other way. In addition, in the case where work equipment or the like comes into contact with the water-impervious sheet after the laying, for example, a scratch or a scratch, or a tear including a through hole occurs, the water-impervious sheet ensures the water-impermeability of the water-impervious sheet. Therefore, it was necessary to repair the damaged part on site.
そこで、納入後の遮水シート、または敷設後の気中部の遮水シートを対象とした従来の補修方法では、図５に示すように、別途略楕円状に切り取った、遮水シート１と同材質の補修シート１０を準備して、この補修シート１０を、遮水シート１に生じた、かすり傷、引っ掻き傷または貫通孔を含めた損傷部１１（図５では貫通孔１１）の全域を覆うように配置して、補修シート１０の外縁部（斜線範囲Ｃ）を熱溶着にて、母材と一体化する方法が採用されている。
しかしながら、この従来の補修方法においては、損傷部１１が遮水シート１を貫通した状態（貫通孔）である場合には有効な手段となるものの、損傷部１１がその表面に生じたかすり傷や引っ掻き傷の場合には、過剰で手間がかかるものであった。
Therefore, in the conventional repair method for a water-blocking sheet after delivery or a water-blocking sheet in the aerial part after laying, as shown in FIG. A repair sheet 10 made of a material is prepared, and the repair sheet 10 covers the entire area of the damaged portion 11 (the through hole 11 in FIG. 5) of the water impermeable sheet 1 including a scratch, a scratch or a through hole. The repair sheet 10 is so arranged that the outer edge (shaded area C) of the repair sheet 10 is integrated with the base material by heat welding.
However, in the conventional repair method, when the damaged portion 11 is in a state of penetrating the water-impervious sheet 1 (through hole), this is an effective means. In the case of a scratch, it was excessive and time-consuming.
なお、遮水シートの補修方法における従来技術として、特許文献１には、無機充填剤を含有する熱可塑性樹脂製遮水シートの補修箇所に当該無機充填剤と反応する接合剤を水中で塗布し、次いで、当該接合剤の塗布面に無機充填剤を含有する補修用熱可塑性樹脂製遮水シートを水中で積層し、その後、水中で当該補修用熱可塑性樹脂製遮水シートを上記接合剤の塗布面に圧着して当該接合剤を硬化させる熱可塑性樹脂製遮水シートの補修方法が開示されている。 As a prior art in a method of repairing a water-impervious sheet, Patent Document 1 discloses that a bonding agent that reacts with the inorganic filler is applied in water to a repaired portion of a thermoplastic resin water-impervious sheet containing an inorganic filler. Then, a repairable thermoplastic resin water-impervious sheet containing an inorganic filler is laminated in water on the surface to which the bonding agent is applied, and then the repairable thermoplastic resin water-impervious sheet containing the inorganic filler is submerged in water. A method of repairing a thermoplastic resin water-impervious sheet that is pressed against an application surface to cure the bonding agent is disclosed.
しかしながら、上述した特許文献１の発明を以ってしても、遮水シートの損傷部を、手間をかけずに、簡易的に補修することは困難である。 However, even with the invention of Patent Literature 1 described above, it is difficult to easily repair a damaged portion of a water-impervious sheet without trouble.
本発明は、かかる点に鑑みてなされたものであり、遮水シートの損傷部を、より簡易に補修することができる、遮水シートの補修方法を提供することを目的とする。 The present invention has been made in view of the above, and an object of the present invention is to provide a method for repairing a water-impermeable sheet, which can more easily repair a damaged portion of the water-impermeable sheet.
本発明は、上記課題を解決するための手段として、請求項１の発明は、前記遮水シートの表面が凹んだ損傷部に、前記遮水シートと同材質の樹脂材を押し出し溶着にて盛り付けて、該損傷部及びその周囲と、前記樹脂材とを一体化することを特徴とするものである。
請求項２の発明は、請求項１に記載した発明において、前記損傷部の損傷幅及び損傷深さに基づいて、前記樹脂材を押し出し溶着する押し出し溶着機を、前記損傷部に沿って移動させる移動速度が設定されることを特徴とするものである。
As a means for solving the above-mentioned problems, the invention of claim 1 is that a resin material of the same material as the water-impervious sheet is extruded and welded to a damaged portion having a concave surface of the water-impervious sheet. Thus, the damaged portion and its surroundings are integrated with the resin material.
According to a second aspect of the present invention, in the first aspect, an extrusion welding machine that extrudes and welds the resin material is moved along the damaged portion based on a damage width and a damage depth of the damaged portion. The moving speed is set.
本発明の遮水シートの補修方法によれば、遮水シートの損傷部を、現場でより簡易に補修することができる。 ADVANTAGE OF THE INVENTION According to the repair method of the water-impervious sheet of this invention, the damaged part of a water-impervious sheet can be repaired more easily on site.
以下、本発明を実施するための形態を図１〜図４に基づいて詳細に説明する。
管理型廃棄物処分場として区画する、例えば傾斜堤護岸や混成堤護岸の側面、及び当該処分場の底面には遮水構造が構築される。この遮水構造には遮水シート１が採用される。上述したように、遮水シート１は、所望の遮水機能を有し、塩化ビニル製、ポリエチレン製、その他の高分子材が用いられた材質からなるものである。遮水シート１の一般的な厚みＴは、１．５〜４．０ｍｍ、詳しくは、陸上処分場においては１．５ｍｍ以上、海面処分場においては３．０ｍｍ以上の範囲内で設定される。
Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to FIGS.
A water-blocking structure is constructed on the side of a sloped embankment or a mixed embankment, and at the bottom of the disposal site, which is divided as a managed waste disposal site. The water-blocking sheet 1 is employed in this water-blocking structure. As described above, the water-blocking sheet 1 has a desired water-blocking function, and is made of a material made of vinyl chloride, polyethylene, or another polymer material. The general thickness T of the impermeable sheet 1 is set within a range of 1.5 to 4.0 mm, more specifically, 1.5 mm or more at a landfill, and 3.0 mm or more at a sea surface.
上述したように、遮水シート１が現地（敷設現場）に納入された後、納入された遮水シート１の表面に、かすり傷や引っ掻き傷等の損傷部２（図３参照）があった場合でも、それを補修して使用せざるを得ない場合が発生する。その他、敷設後の遮水シート１に、例えばシート上面に作業機材等が接触した損傷部２として、かすり傷や引っ掻き傷等が生じた場合には、遮水シート１の遮水性を確保するために、現地にて補修を実施する必要がある。 As described above, after the impermeable sheet 1 is delivered to the site (laying site), the surface of the delivered impermeable sheet 1 has a damaged portion 2 (see FIG. 3) such as a scratch or a scratch. Even in such a case, there is a case where it has to be repaired and used. In addition, in the case where a scratch, a scratch, or the like occurs on the water-impervious sheet 1 after laying, for example, as a damaged portion 2 in which work equipment or the like comes into contact with the upper surface of the sheet, the water-impervious sheet 1 is required to have water-tightness. It is necessary to carry out repairs on site.
そして、図３及び図４に示すような、遮水シート１の表面が凹み、略直線状に延びる損傷部２に対して、本実施形態に係る補修方法が採用される。なお、全体、または一部が曲線状に延びる損傷部２や、その損傷深さＨ１や損傷幅Ｗ１が長手方向に沿って変化する損傷部２に対しても、本実施形態に係る補修方法が採用される。損傷部２の態様は破損の原因によって様々であり、模式的に示せば、図４（ａ）に示す断面Ｖ字状、図４（ｂ）に示す断面Ｕ字状、または図４（ｃ）に示す断面コ字状等にてその表面が凹んだ損傷部２に対して、本実施形態に係る補修方法が採用される。図１及び図２に示すように、本補修方法は、押し出し溶着機４を使用して、その損傷部２を補修するものである。当該押し出し溶着機４は、作業者が容易に持ち運び可能で、コンパクトなものである。当該押し出し溶着機４は、樹脂材（本実施形態では、遮水シート１と同材質の樹脂材）を加熱して、当該加熱された樹脂材を吐出ノズル４ａから対象物（本実施形態では、遮水シート１の損傷部２）に向かって押し出すことで、対象物の表面に一体的に溶着するものである。 Then, the repair method according to the present embodiment is employed for the damaged portion 2 in which the surface of the impermeable sheet 1 is dented and extends substantially linearly as shown in FIGS. 3 and 4. The repair method according to the present embodiment is also applicable to the damaged portion 2 that is entirely or partially extended in a curved shape, and the damaged portion 2 whose damage depth H1 and damage width W1 change along the longitudinal direction. Adopted. The mode of the damaged portion 2 varies depending on the cause of the damage, and when schematically illustrated, a V-shaped cross section shown in FIG. 4A, a U-shaped cross section shown in FIG. 4B, or FIG. The repair method according to the present embodiment is employed for a damaged portion 2 whose surface is concave in a U-shaped cross section or the like shown in FIG. As shown in FIGS. 1 and 2, the repair method repairs a damaged portion 2 by using an extrusion welding machine 4. The extruder 4 is compact and can be easily carried by an operator. The extrusion welding machine 4 heats a resin material (in the present embodiment, a resin material of the same material as the water-blocking sheet 1), and discharges the heated resin material from a discharge nozzle 4a to an object (in the present embodiment, By extruding toward the damaged portion 2) of the impermeable sheet 1, it is integrally welded to the surface of the object.
本実施形態に係る補修方法では、作業者が、押し出し溶着機４を遮水シート１の損傷部２に沿って移動させながら、その損傷部２に向かって遮水シート１と同材質の樹脂材を押し出し溶着する。樹脂材の押し出し量は、損傷部２を平面視で完全に覆い、シート表面から所定高さＨで隆起する隆起部３が形成される程度とする。言い換えれば、損傷部２が、押し出し溶着による隆起部３によって完全に被覆された状態、すなわち、樹脂材が、損傷部２の凹み全域に隙間なく充填され、しかも、損傷部２の周辺と一体化された状態とする。この状態とするための押し出し溶着機４の移動速度は、２．０〜８．０ｍｍ/s程度（本実施形態では、押し出し溶着機４の移動速度は５．０ｍｍ／ｓ）であり、押し出し時加熱された樹脂材の温度は、１８０〜２４０℃程度（本実施形態では、樹脂材の温度は２１０℃）とする。 In the repair method according to the present embodiment, the worker moves the extrusion welding machine 4 along the damaged portion 2 of the water-impervious sheet 1 while moving the resin welding machine 4 toward the damaged portion 2. Extruded and welded. The amount of extrusion of the resin material is set to such an extent that the damaged portion 2 is completely covered in a plan view and the raised portion 3 which is raised at a predetermined height H from the sheet surface is formed. In other words, the damaged portion 2 is completely covered with the raised portion 3 formed by the extrusion welding, that is, the resin material is filled in the entire recessed portion of the damaged portion 2 without any gap, and is integrated with the periphery of the damaged portion 2. State. The moving speed of the extrusion welding machine 4 for achieving this state is about 2.0 to 8.0 mm / s (in the present embodiment, the moving speed of the extrusion welding machine 4 is 5.0 mm / s). The temperature of the heated resin material is about 180 to 240 ° C. (in the present embodiment, the temperature of the resin material is 210 ° C.).
図１〜図４を参照して、例えば、ポリエチレン製の遮水シート１の母材厚みＴが約３．０ｍｍ以上、概ね３．０〜４．０ｍｍを対象とした場合、損傷部２の損傷幅Ｗ１が２．０〜４．０ｍｍであり、損傷部２の損傷深さＨ１が、１．５ｍｍ以下である場合には、押し出し溶着機４による樹脂材の押し出し量（溶着量）として、溶着幅Ｗが２．０〜１０．０ｃｍ（本実施形態では、溶着幅Ｗは３ｃｍ程度）の範囲で、且つシート表面からの溶着高さＨが０．５〜５．０ｍｍ（本実施形態では、溶着高さは、遮水シート１の母材の厚みＴ相当で３ｍｍ程度）の範囲となるような隆起部３にて損傷部２を完全に覆うように補修する。なお、上述した押し出し溶着機４の移動速度により、隆起部３の大きさ（溶着高さＨと溶着幅Ｗ）が設定される。言い換えれば、損傷部２の大きさ（損傷幅Ｗ１及び損傷深さＨ１）に基づいて、押し出し溶着機４の移動速度（隆起部３の溶着高さＨ及び溶着幅Ｗ）が設定される。この隆起部３を形成することで、遮水シート１として、遮水シート１の原反同士を熱溶着で接合する箇所の引張強度以上の強度を確保することができ、しかも遮水シート１としての遮水性を確保することができる。 1 to 4, for example, when the base material thickness T of the polyethylene impermeable sheet 1 is about 3.0 mm or more and approximately 3.0 to 4.0 mm, damage to the damaged portion 2 is caused. When the width W1 is 2.0 to 4.0 mm and the damage depth H1 of the damaged portion 2 is 1.5 mm or less, the amount of welding (welding amount) of the resin material by the extrusion welding machine 4 is defined as welding. The width W is in the range of 2.0 to 10.0 cm (in the present embodiment, the welding width W is about 3 cm), and the welding height H from the sheet surface is 0.5 to 5.0 mm (in the present embodiment, Repair is performed so that the damaged portion 2 is completely covered with the raised portion 3 whose welding height is in the range of about 3 mm corresponding to the thickness T of the base material of the water-blocking sheet 1). The size of the raised portion 3 (welding height H and welding width W) is set according to the moving speed of the extrusion welding machine 4 described above. In other words, the moving speed of the extrusion welding machine 4 (the welding height H and the welding width W of the raised portion 3) is set based on the size of the damaged portion 2 (the damaged width W1 and the damaged depth H1). By forming the raised portions 3, the waterproof sheet 1 can secure a strength equal to or higher than the tensile strength at a portion where the raw sheets of the waterproof sheet 1 are joined by heat welding. Water-tightness can be secured.
以上説明したように、本発明の実施形態に係る遮水シートの補修方法では、遮水シート１の、その表面が凹んだ損傷部２に対して、遮水シート１と同材質の樹脂材を押し出し溶着にて盛り付けることで、当該損傷部２及びその周囲と、樹脂材とを一体化して補修する。これにより、従来のように、略楕円状に切り取った同材質の補修シート１０を準備して、該補修シート１０により遮水シート１の損傷部２を覆うようにして（図５参照）、母材に溶着して補修する必要がなく、遮水シート１の損傷部２を、手間をかけることなく、より簡易に補修することができる。 As described above, in the method for repairing the water-impervious sheet according to the embodiment of the present invention, a resin material of the same material as the water-impervious sheet 1 is applied to the damaged portion 2 whose surface is concave. By mounting by extrusion welding, the damaged portion 2 and its surroundings and the resin material are integrally repaired. As a result, a repair sheet 10 of the same material, which is cut into a substantially elliptical shape, is prepared as in the prior art, and the repaired sheet 10 covers the damaged portion 2 of the impermeable sheet 1 (see FIG. 5). There is no need to repair by welding to the material, and the damaged portion 2 of the water-impervious sheet 1 can be repaired more easily without any trouble.
また、本発明の実施形態に係る遮水シートの補修方法では、損傷部２の損傷幅Ｗ１が２．０〜４．０ｍｍであり、損傷部２の損傷深さＨ１が、１．５ｍｍ以下である場合には、押し出し溶着機４による押し出し量（溶着量）として、溶着幅Ｗが２．０〜１０．０ｃｍの範囲で、且つシート表面からの溶着高さＨが０．５〜５．０ｍｍの範囲となるような隆起部３にて損傷部２を覆うように補修する。言い換えれば、損傷部２の損傷幅Ｗ１及び損傷深さＨ１に基づいて、上述した隆起部３を形成するための押し出し溶着機４の移動速度が設定される。これにより、遮水シート１の、所望の遮水性を確保することができ、しかも、所望の引張強度を確保することができる。 In the method for repairing the water-impervious sheet according to the embodiment of the present invention, the damage width W1 of the damaged portion 2 is 2.0 to 4.0 mm, and the damage depth H1 of the damaged portion 2 is 1.5 mm or less. In some cases, the welding width W is in the range of 2.0 to 10.0 cm and the welding height H from the sheet surface is 0.5 to 5.0 mm as the extrusion amount (welding amount) by the extrusion welding machine 4. Is repaired so as to cover the damaged portion 2 with the raised portion 3 having a range of (1). In other words, based on the damage width W1 and the damage depth H1 of the damaged portion 2, the moving speed of the extrusion welding machine 4 for forming the above-mentioned raised portion 3 is set. This makes it possible to secure desired water-blocking properties of the water-blocking sheet 1 and also to secure a desired tensile strength.
なお、上述した実施形態では、遮水シート１の表面が凹み、略直線状に延びる損傷部２に対して本補修方法を採用しているが、当然ながら、全体、または一部が曲線状に延びる損傷部２に対しても、本補修方法を採用することができる。また、その損傷深さＨ１や損傷幅Ｗ１が長手方向に沿って変化する損傷部２に対しても、本補修方法を採用することができる。さらに、遮水シート１の表面に生じた、局所的に凹む損傷部２に対しても、本補修方法を採用することができる。 In the above-described embodiment, the repair method is adopted for the damaged portion 2 in which the surface of the water-blocking sheet 1 is concave and extends substantially linearly. The present repair method can be applied to the extended damaged portion 2. Further, the repair method can be applied to the damaged portion 2 in which the damage depth H1 and the damage width W1 change along the longitudinal direction. Further, the present repairing method can also be applied to a locally recessed damaged portion 2 generated on the surface of the water shielding sheet 1.
１ 遮水シート，２ 損傷部，３ 隆起部，４ 押し出し溶着機 1 water-impervious sheet, 2 damaged part, 3 raised part, 4 extrusion welding machine
Claims (2)
前記遮水シートの表面が凹んだ損傷部に、前記遮水シートと同材質の樹脂材を押し出し溶着にて盛り付けて、該損傷部及びその周囲と、前記樹脂材とを一体化することを特徴とする遮水シートの補修方法。 A method of repairing a water-impervious sheet for repairing a damaged portion of the water-impervious sheet,
A resin material of the same material as the water-impervious sheet is extruded and welded to the damaged part where the surface of the water-impervious sheet is concave, and the damaged part and its surroundings are integrated with the resin material. How to repair the impermeable sheet.
The moving speed for moving an extrusion welding machine that extrudes and welds the resin material along the damaged portion is set based on a damage width and a damage depth of the damaged portion. How to repair the impermeable sheet.
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| JP2018145161A JP2020018974A (en) | 2018-08-01 | 2018-08-01 | Method for repairing water shielding sheet |
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| JP2018145161A JP2020018974A (en) | 2018-08-01 | 2018-08-01 | Method for repairing water shielding sheet |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5134534A (en) * | 1974-09-17 | 1976-03-24 | Sekisui Chemical Co Ltd | Chosuichi oyobi suirotonobosuisekoho |
| JPH06346424A (en) * | 1993-06-10 | 1994-12-20 | Kyowa Hakko Kogyo Co Ltd | Repairing method of watertight structure |
| JPH0835304A (en) * | 1994-07-22 | 1996-02-06 | Tsutsunaka Plast Ind Co Ltd | Paste applying device of existing sheet of vinyl chloride |
| JP2010194842A (en) * | 2009-02-25 | 2010-09-09 | Hiroyuki Hashimoto | Automatic welder for waterproof sheet |
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2018
- 2018-08-01 JP JP2018145161A patent/JP2020018974A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5134534A (en) * | 1974-09-17 | 1976-03-24 | Sekisui Chemical Co Ltd | Chosuichi oyobi suirotonobosuisekoho |
| JPH06346424A (en) * | 1993-06-10 | 1994-12-20 | Kyowa Hakko Kogyo Co Ltd | Repairing method of watertight structure |
| JPH0835304A (en) * | 1994-07-22 | 1996-02-06 | Tsutsunaka Plast Ind Co Ltd | Paste applying device of existing sheet of vinyl chloride |
| JP2010194842A (en) * | 2009-02-25 | 2010-09-09 | Hiroyuki Hashimoto | Automatic welder for waterproof sheet |
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