JPS6046310B2 - How to join plastic composite pipes - Google Patents

Description

【発明の詳細な説明】 本発明はプラスチック管、特にポリオレフィン系のポ
リエチレン又はポリプロピレンにガラス繊維を混練して
強化した熱可塑性プラスチック（Ｆｉｌｘ■にＲｅｉｎ
ｆｏｒｃｅｄｔｈｅｒｍｏｐｌａｓｔｉｃｓ）管、若し
くはＦＲＰ（ＦｉｂｅｒＲｅｉｎｆｏｒｃｅｄｔｈｅｒ
ｍｏｓｅｔｔｉｎｇｐｌａｓｔｉｃｓ）で被覆強化した
複合管の接合方法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to plastic pipes, particularly thermoplastic plastics made by kneading glass fibers into polyolefin-based polyethylene or polypropylene (Filx and Rein).
FRP (forced thermoplastics) tube or FRP (fiber reinforcement)
This invention relates to a method for joining composite pipes coated and reinforced with mosetting plastics.

熱可塑性プラスチック管は耐化学薬品性に優れ配管材
料として広く化学工場の薬液輸送管として使用されてい
るが、このプラスチック材は熱膨張率が大きいため温度
変化による伸縮が大きく、かっ、温度上昇に伴い剛性が
低下し耐圧力が低下する欠点がある。Thermoplastic plastic pipes have excellent chemical resistance and are widely used as piping materials for chemical transport pipes in chemical factories. However, because this plastic material has a high coefficient of thermal expansion, it expands and contracts significantly due to temperature changes, and is susceptible to temperature rises. This has the drawback of lower rigidity and lower pressure resistance.

これらの欠点を補う為にガラス繊維で強化した管、すな
わち、プラスチック材にガラス繊維を混練押出し成形し
たＦｉｂｅｒＲｅｉｎｆｏｒｃｅｄｔｈｅｒｍｏｐｌａ
ｓｔｉｃｓ管、或いはＦＲＰ（Ｆｉ反ｒＲｅｉｎｆｏｒ
ｃｅｄｔｈｅｒｍｏｓｅｔｔｉｎｇｐｌａｓｔｉｃｓ）
で被覆した管等のプラスチック複合管が実用に供されて
いる。従来、プラスチック複合管の接合はフランジ接合
のような機械的な接合以外は管同志の融着、或いは同材
質の溶接棒にて熱風溶接する方法が行われているが、溶
接部に於いてプラスチック同志は接合できても補強され
たガラス繊維等は接合することができないために、本来
の強化管の効果を充分に発揮することができない。たと
えば、第１図に示すように、イに於いてはポリプロピレ
ン管２、２’の表面に接着層を介してＦＲＰ層４、４’
被覆した両複合管１、１’の端部を殺到ぎし複合管１、
１’のポリプロピレン管２、２’端部を突き合わせポリ
プロピレン製溶接棒にて熱風溶接した後殺剥ぎした部分
にＦＲＰを接合剤にて接合する方法である溶接部はＦＲ
Ｐと見掛上接着するにとどまり、実際には接着していな
いため、ポリプロピレン管の溶接個所に伸縮による応力
集中が起り溶接部或いは溶接２番手にクラックを発生し
易く、従つて複合強化したパイプを使用しても接合上の
制約を受けるため許容応力を管より小さく見なければな
らず経済的に不利となる。 又、第１図口はガラス繊維
を混練した両ポリプロピレン管５、５’を突き合わせポ
リプロピレン製溶接棒にて溶接した方法でありこの場合
でもポリプロピレンは接合されているけれども内蔵する
ガラス繊維は見掛上の接合でしかなく溶接部の強化は実
際にはなされていない為に第１図イと同様の欠点が生じ
ていた。In order to compensate for these shortcomings, we have developed a pipe reinforced with glass fiber, namely Fiber Reinforced thermopla, which is made by kneading and extruding glass fiber into plastic material.
stics tube or FRP (Fi Reinfor
thermosetting plastics)
Plastic composite pipes such as pipes coated with Traditionally, plastic composite pipes have been joined using methods other than mechanical joints such as flange joints, such as fusion of the pipes together or hot air welding using welding rods made of the same material. Even if they can be joined together, reinforced glass fibers and the like cannot be joined, so the original effect of the reinforced tube cannot be fully demonstrated. For example, as shown in FIG.
The ends of both the coated composite pipes 1, 1' are flooded and the composite pipe 1,
The welded part is FR
Since the polypropylene pipe is only apparently bonded to the P and is not actually bonded, stress concentration due to expansion and contraction occurs at the welded part of the polypropylene pipe, and cracks are likely to occur in the welded part or the second weld. Even if pipes are used, the allowable stress must be considered smaller than that of pipes due to joining constraints, which is economically disadvantageous. In addition, the opening in Figure 1 shows a method in which both polypropylene tubes 5 and 5' kneaded with glass fibers are butted together and welded using a polypropylene welding rod, and even in this case, although the polypropylene is joined, the glass fibers inside are apparently Since the welded parts were only joined together and the welded parts were not actually strengthened, the same drawbacks as in Figure 1A occurred.

本発明は、簡単な手段によつて上記のような欠点を解決
することを目的とする。The present invention aims to solve the above-mentioned drawbacks by simple means.

次にこの発明を図面及び実施例にて詳細に説明する。Next, the present invention will be explained in detail with reference to drawings and examples.

第２図イに於いて、１０，１『はオレフィン系のポリエ
チレン又はポリプロピレン等の熱可塑性のプラスチック
管１１，１「に接着剤を介してＦＲＰ層１２，１２″を
被覆したプラスチック複合管である。この両プラスチッ
ク複合管１０，１『の端部を所要長さ段剥ぎし熱可塑性
プラスチック面を露出させた後、両プラスチック管１１
，１「を突き合わせ融着又はプラスチック製溶接棒によ
り溶接する。更に、融着又は溶接されたプラスチック管
端部表面双方にまたがつて、片面にこのプラスチック管
と略同材質のプラスチック材をラミネートしたガラス繊
維布よりなる薄肉の溶接テープ１３のプラスチック面を
融着し更に、このテープ表面に段剥ぎした部分に相当す
るＦＲＰ層１４を被覆した両プラスチック管１０，１『
を接合する。In Fig. 2A, 10,1'' is a plastic composite tube in which a thermoplastic plastic tube 11,1'' made of olefinic polyethylene or polypropylene is coated with an FRP layer 12,12'' through an adhesive. . After stripping off the ends of both plastic composite tubes 10 and 1'' to a required length to expose the thermoplastic plastic surface, both plastic tubes 11
, 1" are butt fused or welded using a plastic welding rod.Furthermore, a plastic material of approximately the same material as this plastic tube is laminated on one side, spanning both of the fused or welded end surfaces of the plastic tube. Both plastic tubes 10, 1' are made by fusing the plastic surfaces of a thin welding tape 13 made of glass fiber cloth, and further covering the tape surface with an FRP layer 14 corresponding to the peeled part.
join.

第２図叫よ本発明の他の実施例を示すものでポ，りプロ
ピレン材にガラス繊維が混練された一種の複合管１５，
１５″で両管端部を融着又はポリプロピレン製溶接棒に
て溶接した後第２図イと同様に溶接テープ１３″を融着
し更にその表面にＦＲＰ層１４″が被覆されている。
２上述した如く、本発明方法において
は接合する両プラスチック複合管を突き合せ接合した後
、接合部の熱可塑性プラスチック管表面双方にわたつて
、片面にこの管と略同材質のプラスチック材をラミネー
トしたガラス繊維布よりなる溶接テープ３のプラスチッ
ク面を融着し、更にその外面をＦＲＰで被覆しているの
で、プラスチック管と溶接テープのプラスチック面とが
完全に融着し更にテープ表面に露出しているガラス繊維
とＦＲＰ層とが接着するためにプラスチック複合管の接
合部３は従来法に比較し完全に強化できたプラスチック
複合管の強度を十分保持することができる。勿論、本発
明はプラスチック複合管双方の単なる接合のみならず両
プラスチック複合板接合の場合も同様であり又、これ等
管又は板の破損個所の４・補修にも供することができる
のは言うまでもない。実験例 試料 ８インチの表面ＦＲＰ被覆ポリプロピレン管（木村化工
機製キムジツトＰバイブ）を２００Ｔｍ１Ｌ長さに切断
し端部を段剥ぎした後、両ポリプロピレン管端部を突き
合わせポリプロピレン製溶接棒にて溶接、この段剥ぎし
た部分にＦＲＰ層を被覆した接合管よりＪＩＳ−Ｋ−６
９１１による接合部を含むダンベル試験片を切り出しこ
れを従来法による試料とした。Figure 2 shows another embodiment of the present invention, which is a kind of composite pipe 15 made of polypropylene material mixed with glass fiber.
After the ends of both tubes are fused or welded using a polypropylene welding rod at 15'', a welding tape 13'' is fused as in FIG. 2A, and the surface thereof is further coated with an FRP layer 14''.
2 As mentioned above, in the method of the present invention, after the two plastic composite tubes to be joined are butt-joined, a plastic material made of substantially the same material as the tube is laminated on one side over both surfaces of the thermoplastic plastic tubes at the joint part. Since the plastic surface of the welding tape 3 made of glass fiber cloth is fused and the outer surface is further covered with FRP, the plastic pipe and the plastic surface of the welding tape are completely fused and the surface of the welding tape is exposed. Since the glass fibers and the FRP layer adhere to each other, the joint 3 of the plastic composite tube can sufficiently maintain the strength of the plastic composite tube, which is completely reinforced compared to the conventional method. Of course, the present invention is applicable not only to the simple joining of both plastic composite pipes, but also to the joining of both plastic composite plates, and it goes without saying that the present invention can also be applied to the repair of damaged parts of these pipes or plates. . Experimental example A sample 8-inch surface FRP-coated polypropylene pipe (Kimjitsu P Vibe manufactured by Kimura Kakoki) was cut into a length of 200Tm1L, and the ends were stripped in steps.The ends of both polypropylene pipes were butted together and welded with a polypropylene welding rod. JIS-K-6 from a jointed pipe with an FRP layer coated on the stripped part
A dumbbell test piece including the joint part formed by 911 was cut out and used as a sample formed by the conventional method.

又、同様にして段剥ぎしたポリプロピレン管端部双方を
突き合わせ溶接した後予めガラス繊維とポリオレフィン
樹脂とを複合した溶接テープ（厚さ０．５Ｔｗｔ１巾５
亡）で融着し更にその表面をＦＲＰで被覆した接合管よ
りＪＩＳ−Ｋ−６９１１による接合部を含むダンベル試
験片を切り出し本発明方法による試料とした。In addition, after butt welding both ends of the polypropylene pipes that were stripped in the same way, welding tape (thickness 0.5 Twt 1 width 5
A dumbbell test piece including a joint according to JIS-K-6911 was cut out from a joint tube whose surface was fused with FRP and whose surface was covered with FRP and used as a sample according to the method of the present invention.

更に又、上記接合部を含まない８インチ表面ＦＲＰ被覆
ポリプロピレン管よりＪＩＳ−Ｋ−６９１１によるダン
ベル試験片を切り出しＢｌａｎｋ試料とした。Furthermore, a dumbbell test piece according to JIS-K-6911 was cut out from an 8-inch surface FRP-coated polypropylene tube that did not include the above-mentioned joint, and was used as a blank sample.

実験方法 従来法、本発明による法、接合部のない Ｂｌａｎｋの３つのダンベル試験片による試料を各々万
能引張試験機（島津製作所製１Ｓ−５０００）にて引張
速度５７ｒｒｍ／Ｔｌｒ！ｎで試験を行い引張強度及び
接合効率を求めた。Experimental method Three dumbbell test pieces (conventional method, method according to the present invention, and blank without joints) were each tested using a universal tensile tester (Shimadzu Corporation 1S-5000) at a tensile rate of 57 rrm/Tlr! A test was conducted using n to determine the tensile strength and bonding efficiency.

結果を表−１に示す。The results are shown in Table-1.

表−１より明らかな如く本発明の方法によれは妾合強度
は母材強度とほとんど同等となり従来法上りはるかに高
い接合強度が得られることが判明ｒる。As is clear from Table 1, by the method of the present invention, the joint strength is almost the same as the base metal strength, and it is found that a much higher joint strength than the conventional method can be obtained.

閾面の簡単な説明 第１図イ及び叱ま従来の接合法を示す断面図、０２図イ
及び明ま本発明接合方法を示す断面図でｂる。A brief explanation of the threshold plane. Figures 1A and 2B are cross-sectional views showing the conventional bonding method, and Figures 2A and 2B are cross-sectional views showing the bonding method of the present invention.

１，１″，１０，１『・・・・・・プラスチック複合守
、１１，１「・・・・・・プラスチック管、１２，１）
″・・・・ＦＲＰ層、１３・・・・・・溶接テープ、１
４，１・・・・ＦＲＰ層。1,1",10,1"...Plastic composite protection, 11,1"...Plastic pipe, 12,1)
″...FRP layer, 13...Welding tape, 1
4,1...FRP layer.

Claims (1)

【特許請求の範囲】[Claims] １ ガラス繊維を混練して強化、若しくはＦＲＰを被覆
して強化した熱可塑性プラスチク複合管の接合方法に於
いて、管端部を突き合わせ融着又は溶接した後、この接
合端部の熱可塑性プラスチック管表面双方にまたがつて
、片面に該プラスチク管と略同材質のプラスチック材を
ラミネートしたガラス繊維布のプラスチック面を融着し
、更にその外面にＦＲＰを被覆することを特徴とするプ
ラスチック複合管の接合方法。1 In the method of joining thermoplastic composite tubes reinforced by kneading glass fibers or reinforced by covering with FRP, after the tube ends are butt-fused or welded, the thermoplastic plastic tube at the joined end is A plastic composite tube characterized in that the plastic surface of a glass fiber cloth laminated with a plastic material substantially the same as that of the plastic tube is fused on one side so as to span both surfaces, and the outer surface of the glass fiber cloth is further coated with FRP. Joining method.