JPS6157519B2 - - Google Patents

Description

【発明の詳細な説明】 ［産業上の利用分野］ 本発明は、プラスチツク管の管壁内に管軸方向
へ連続する通孔が多数形成された孔明プラスチツ
ク管に関し、詳細には、上記通孔の両側開口部を
閉塞し、尚且つ閉塞部の内外面を平滑な面として
仕上げた管及びその様な管体の製造方法に関する
ものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a perforated plastic tube in which a large number of through holes are formed in the wall of the plastic tube and are continuous in the tube axis direction. This invention relates to a tube whose openings on both sides are closed and whose inner and outer surfaces of the closed section are finished with smooth surfaces, and a method for manufacturing such a tube body.

［従来の技術及びその問題点］ 原材料の使用量を節減し且つ管のへん平剛性を
増大する手段として、管壁内に管端方向へ連続す
る通孔を多数形成してなる孔明管が提案され、特
に硬質ポリ塩化ビニル管の様なプラスチツク管に
おいては、管の表面状態や基本物性、例えば引張
強度等は、通常の孔無し管と比べても特段の優劣
の無い多孔プラスチツク管の製造技術が確立され
ている。[Prior art and its problems] As a means of reducing the amount of raw materials used and increasing the flat rigidity of the tube, a perforated tube in which a large number of continuous holes are formed in the tube wall toward the tube end has been proposed. Especially for plastic pipes such as hard polyvinyl chloride pipes, the surface condition and basic physical properties of the pipes, such as tensile strength, etc., are not particularly superior or inferior to ordinary pipes without holes. has been established.

孔明プラスチツク管は、へん平剛性が大きいと
いう特性の為に、例えば下水用埋設管として利用
されているが、埋設管として接続する場合の接続
形態としては、第２図の様な状態が例示される。
孔明プラスチツク管１の左側は２次加工によつて
拡径された受口１ａで、右側は２次加工の加えら
れていない挿口１ｂで、所謂片受片挿管になつて
いる。従つて孔明プラスチツク管１の挿口１ｂを
図面上右隣りの孔明プラスチツク管１の受口１ａ
に挿入することによつて連続した管路が形成され
て地中に埋設される。管壁中には、軸方向に連続
する連孔１ｄが形成される。尚−線断面は第
３図Ａ，Ｂに示され、前者は断面卵形管１Ａの場
合、後者は断面円形管１Ｂの場合を示すが、いず
れの管壁にも多数の通孔１ｄが形成されている。
尚管の断面形状は、図示例以外種々の形態がある
が、いずれの場合も次に示す様な問題がある。仮
に第２図の様な状態で埋設配管を行なつたとすれ
ば、雨水や地下水等が矢印Ｐの如く侵入し、それ
が通孔１ｄを通つて挿口側から矢印Ｒの如く管内
へ流入したり、或は逆に管内の水が矢印Ｒ，Ｐの
逆を通つて管外に漏出することがある。従つてこ
の様な孔明プラスチツク管においては、通常の押
出成形後又は２次加工後に受口側及び挿口側の通
孔１ｄを閉塞させる必要が生じる。尚第２図に示
した管における受口は、第１段拡径部１ｃ、第２
段拡径部１ｅを有し、後者の内面には、プラスチ
ツク製又は金属製の係止リング３が植設され、該
リング３の露出部形状に合わせた環状凹部を有す
るパツキング４が係合保持される。但しこの様な
通孔が形成されるのは第２図の如き受口形状のパ
イプに限定されず、両側とも２次加工の施されて
いない単なる押出し管や、第４図に示す如く単に
パツキング収納輪溝５を形成した１段拡径受口構
造の片受片挿管等を含む種々の管構造においても
通孔１ｄを形成することがしばしばあり、これに
ついても勿論同様の問題がある。 Kongming plastic pipes are used, for example, as buried pipes for sewage because of their high horizontal rigidity, but the connection form shown in Figure 2 is an example of how they can be connected as buried pipes. Ru.
The left side of the Kouming plastic tube 1 is a socket 1a whose diameter has been enlarged by secondary processing, and the right side is a socket 1b which has not been subjected to secondary processing, making it a so-called single-receiver and single-piece intubation. Therefore, the inlet 1b of the Komei plastic tube 1 is replaced with the inlet 1a of the Komei plastic tube 1 on the right side in the drawing.
By inserting the pipe into the pipe, a continuous pipe is formed and buried underground. A continuous hole 1d continuous in the axial direction is formed in the tube wall. Note that cross-sections along the line are shown in Figures 3A and B, the former showing the case of an oval-shaped tube 1A in cross section, and the latter showing the case of a circular cross-section tube 1B, both of which have a large number of through holes 1d formed in their walls. has been done.
There are various cross-sectional shapes of the tube other than the illustrated example, but in any case, there are problems as shown below. If underground piping is installed in the condition shown in Figure 2, rainwater, groundwater, etc. will enter as shown by arrow P, and it will flow into the pipe from the insertion port side as shown by arrow R through the through hole 1d. Or, conversely, water inside the pipe may leak out of the pipe through the opposite directions of arrows R and P. Therefore, in such a perforated plastic tube, it is necessary to close the through holes 1d on the socket side and the insertion side after normal extrusion molding or secondary processing. Note that the sockets in the pipe shown in FIG.
A locking ring 3 made of plastic or metal is implanted on the inner surface of the latter, and a packing 4 having an annular recess corresponding to the shape of the exposed portion of the ring 3 is engaged and held. be done. However, such a through hole is not limited to a pipe with a socket shape as shown in Figure 2, but is a simple extruded pipe with no secondary processing on both sides, or simply packed as shown in Figure 4. The through hole 1d is often formed in various tube structures including a single-receiver and one-piece intubation of a single-stage enlarged-diameter socket structure in which the storage ring groove 5 is formed, and of course the same problem exists in this case.

そこでこの様な通孔を受口側及び又は挿口側の
両端（両端で通孔閉塞を行なうのは通孔内に侵入
する水等の凍結によつて或は石等の異物が無理や
り圧入されることになつて孔明プラスチツク管自
体が破損するのを防止するためである）で閉塞
し、水の侵入を防止することが必要と考えられる
に至り各種の提案がなされている。例えばE.P.
P13457（Pipe part with socket provided with
longitudinally extending channels）及び13458
（Ａ plastics pipe provided with ａ grove，
and method of creating such ａ pipe）に
は、管の外面側や内面側から絞り込む様な押圧力
を及ぼし、外周側壁面を内周側壁面に密着させた
り、或は管の端面側に弾性材からなる盲板を圧着
させる構造のもの及びその製造方法が提案されて
いる。しかしこの様な加工を施した管端部は外面
又は内面側にくびれ部分が形成されることによつ
て構造的に欠陥部となり、パイプの欠損を招く恐
れがあり、特殊な補強手段を講じなければならな
いという欠点がある。しかも管肉をつぶす様に圧
着するだけであるから、閉塞は不十分であり、盲
板の当接という補助を必要とするがパイプの先端
に盲板を当接するという手段では、接圧を保持す
る手段如何によつては簡単な外力ではずれてしま
うことをあり完全なものとは言えない。 Therefore, closing such a hole at both ends of the socket side and/or insertion side (both ends) is to prevent water entering the hole from freezing or foreign matter such as stones being forced into the hole. In order to prevent the Komei plastic tube itself from being damaged, it has become necessary to block the tube with a tube to prevent water from entering, and various proposals have been made. For example, EP
P13457 (Pipe part with socket provided with
longitudinally extending channels) and 13458
(A plastics pipe provided with a grove,
and method of creating such a pipe), applying a squeezing force from the outside or inside of the pipe to bring the outer wall into close contact with the inner wall, or by applying elastic material to the end of the pipe. A structure in which a blind plate is crimped and a method for manufacturing the same have been proposed. However, pipe ends that have been processed in this way may become structurally defective due to the formation of constrictions on the outer or inner surface, which may lead to damage to the pipe, and special reinforcing measures must be taken. It has the disadvantage that it cannot be used. In addition, since the pipe is simply crimped to crush the pipe wall, the blockage is insufficient, and assistance with a blind plate is required, but contact pressure can be maintained by abutting a blind plate against the tip of the pipe. Depending on the method used, it may come off with a simple external force, so it cannot be said to be perfect.

又特開昭52−52222（チヤンネルが長さ方向に
延びる壁を有するプラスチツク管とその製造方
法）、同54−127481（管壁に通孔を有する樹脂管
に管受口を形成する装置）、同55−73511（受口成
形方法）、同55−73514（受口成形方法）、同54−
106581（管壁に通孔を有する樹脂管に管受口を形
成する方法）、同54−103480（管壁に管軸方向の
通孔が並設された樹脂管の通孔閉鎖方法）等に
は、管の最先端或は先端部をある長さに亘つて押
しつぶす構造のもの及びこの様な管の製造方法が
提案されているが、押しつぶされた管端部分の密
着性は必らずしも万全とは言えず、水の通過が完
全に防止されないこともある。又特開昭55−
73512（受口成形方法）や実開昭54−83024（合成
樹脂管）、同54−114812（管壁に管軸方向の通孔
を有する樹脂管の管端部の構造）には、通孔の端
部から栓をつめる構造のものが提案されている
が、各通孔と栓との位置合わせが頗ぶる困難であ
り、又通孔の大きさと栓の大きさを完全に一致さ
せることは至難である。又管内の水圧がたかまつ
て通孔１ｄから外方に向う力が強くなると、栓が
容易にはずれるという欠陥がある。更に特開昭54
−123180（管壁に管軸方向の通孔が並設された樹
脂管の通孔閉塞方法）には発泡材料を通孔内に注
入し、次いで加熱発泡させることによつて閉塞す
る方法が記載されている。しかし各通孔毎に個々
に発泡材料を注入することは極めて繁雑であり、
又注入量や発泡の成熱を均一に制御することが困
難である為、各通孔毎のシール性にばらつきが生
じるだけでなく、部分的に閉塞不十分という結果
を招いたり、部分的に過剰充填となつて経済性を
悪くするという問題もある。 Also, JP-A No. 52-52222 (Plastic pipe having a wall in which the channel extends in the length direction and its manufacturing method), JP-A No. 54-127481 (Apparatus for forming a pipe socket in a resin pipe having a through hole in the pipe wall), 55-73511 (socket forming method), 55-73514 (socket forming method), 54-
106581 (method for forming a pipe socket in a resin pipe that has a through hole in the pipe wall), 54-103480 (method for closing a through hole in a resin pipe that has parallel holes in the pipe wall in the tube axis direction), etc. A structure in which the tip or end of the tube is crushed over a certain length and a method for manufacturing such a tube have been proposed, but the tightness of the crushed tube end is not necessarily guaranteed. However, it cannot be said that it is perfect, and the passage of water may not be completely prevented. Also published in 1984
73512 (socket molding method), Utility Model No. 54-83024 (synthetic resin pipes), and No. 54-114812 (structure of the end of a resin pipe with a hole in the pipe wall in the axial direction) have through holes. A structure in which the stopper is inserted from the end of the hole has been proposed, but it is extremely difficult to align the holes and the stopper, and it is impossible to completely match the size of the hole and the stopper. It is extremely difficult. Another drawback is that the stopper easily comes off when the water pressure inside the pipe increases and the force directed outward from the through hole 1d becomes stronger. Furthermore, JP-A-54
-123180 (Method for closing holes in resin pipes in which holes are arranged parallel to each other in the pipe axis direction in the tube wall) describes a method for closing the holes by injecting a foaming material into the holes and then heating and foaming them. has been done. However, injecting foam material into each hole individually is extremely complicated;
In addition, it is difficult to uniformly control the amount of injection and the heat formation of the foam, which not only causes variations in the sealing performance of each hole, but also results in insufficient sealing of some holes, or There is also the problem of overfilling, which worsens economic efficiency.

この他各種の提案は出されているが、作業の簡
便性、閉塞の確実性や均一性、経済性、外観等に
おいて十分満足できる管端閉塞管及びその製造方
法は知られていない。 Although various other proposals have been made, there is no known end-closed tube or method for manufacturing the same that is sufficiently satisfactory in terms of ease of operation, reliability and uniformity of closing, economic efficiency, appearance, etc.

［問題点を解決するための手段］ 本発明は上記の事情に鑑みてなされたものであ
り、その目的は前述の様な孔明管の各通孔を可及
的均一且つ確実に閉塞した管体を提供しようとす
るものであり、他の目的は非常に簡便な方法によ
つて且つ確実に管端閉塞できる方法を提供しよう
とするものである。更に他の目的は管の内外面を
均整な面に仕上げて一般の孔無管に見劣りしない
加工管を提供しようとするものである。[Means for Solving the Problems] The present invention has been made in view of the above-mentioned circumstances, and its purpose is to provide a pipe body in which each hole of the perforated pipe as described above is closed as uniformly and reliably as possible. Another object of the present invention is to provide a method for closing the tube end in a very simple and reliable manner. Still another object is to provide a processed pipe that is comparable to ordinary perforated pipes by finishing the inner and outer surfaces of the pipe into uniform surfaces.

前述の目的は以下に示す様な本発明によつて見
事に達成された。即ち本発明に係る通孔閉塞プラ
スチツク管とは、管端部の通孔にシーリング材が
充填され、且つ管端部に断面コ字状のリング状キ
ヤツプが嵌合され、通孔が両端部で閉塞される点
に特徴が存在するものである。 The above objects have been successfully achieved by the present invention as described below. That is, the plastic tube with closed holes according to the present invention has a through hole at the end of the tube filled with a sealing material, a ring-shaped cap having a U-shaped cross section is fitted to the end of the tube, and the through hole is closed at both ends. A feature exists at the point where it is occluded.

また本発明の両端閉塞方法とは、前述の様な孔
明プラスチツク管の通孔を次に示すステツプに沿
つて行なう点に特徴が存在するものである。 Further, the method for closing both ends of the present invention is characterized in that the hole in the perforated plastic tube as described above is carried out in accordance with the following steps.

管端部の全周に沿つて管端部の内壁側と外壁側
を挟んで嵌合される同心状突出壁を有する断面コ
字状に形成されたリング状キヤツプの環状溝内に
シーリング材を装入して該キヤツプを芯型に嵌挿
するステツプ、 管の一方側端部を軟化させ該軟化部を前記芯型
の外周又は芯型と外型の間に圧入し、前記キヤツ
プの環状溝に前記挿入管端を嵌合させることによ
つて前記シーリング材を各通孔の開口部から侵入
させて入口部に充満させるステツプ、 上記挿入管端部を芯型と外型で保持しつつ他方
端側から流体を圧入して上記軟化部の内外面を平
滑とし、これらの部分を冷却して一方端の閉塞を
終了するステツプ、 前記キヤツプの環状溝と略同形状の円周溝を有
し、且つ円周溝内に流体圧入孔を備えた先端治具
を芯型に嵌挿しておくステツプ、 前記ステツプによつて一方端の開口部が閉鎖さ
れた管の他方側端部を軟化させて該軟化部を芯型
の外周又は芯型と外型の間に圧入すると共に、該
管端部を前記先端治具に嵌め合わせるステツプ、 該管端部を芯型と外型で保持して前記流体圧入
孔から各通孔内に流体を圧入して、軟化部内外面
を平滑に成形するステツプ、 前記キヤツプと略同形状のキヤツプの環状溝内
にシーリング材を装入しておき、前記先端治具が
離脱された後の前記他方側管端部に該キヤツプを
嵌合してシーリング材を各通孔の開口部から侵入
させ管端を閉塞することを特徴とする。 A sealing material is placed in an annular groove of a ring-shaped cap having a U-shaped cross section and having concentric protruding walls that are fitted along the entire circumference of the tube end, sandwiching the inner and outer walls of the tube end. a step of inserting the cap into the core mold, softening one end of the tube, press-fitting the softened part on the outer periphery of the core mold or between the core mold and the outer mold, and inserting the cap into the annular groove of the cap; a step of fitting the insertion tube end to the opening of each through hole and filling the inlet with the sealing material; holding the insertion tube end with a core mold and an outer mold while holding the other end of the insertion tube with the core mold and the outer mold; a step for smoothing the inner and outer surfaces of the softened portion by injecting fluid from the end side and cooling these portions to finish blocking one end; a circumferential groove having substantially the same shape as the annular groove of the cap; , and a step of inserting a tip jig having a fluid press-in hole into the circumferential groove into the core mold, and softening the other end of the tube whose opening at one end is closed by the step. press-fitting the softened portion on the outer periphery of the core mold or between the core mold and the outer mold, and fitting the tube end into the tip jig; holding the tube end between the core mold and the outer mold; a step of pressurizing fluid into each through hole from the fluid press-fitting hole to form smooth inner and outer surfaces of the softened portion; charging a sealing material into an annular groove of a cap having approximately the same shape as the cap; The present invention is characterized in that the cap is fitted to the other end of the tube after the tool has been removed, and the sealing material is allowed to enter through the opening of each through hole to close the tube end.

［作用］ 本発明における閉塞材料はシーリング材であつ
て、従来の如き固形状の栓類と違い塑性変形が自
在であるから通孔の大きさや形状に若干の精度誤
差があつても、それらの全てに対応して自から変
形することができるのでシール性は極めて高く且
つプラスチツク管々体との接着性も良好である。
又発泡材料と違つて２次的な加工を施す必要がな
く、生産工数の増大や生産時間の遷延を防止する
ことができる。又発泡材の場合は通孔の奥深いと
ころまで注入することが多い為、材料的にコスト
高となるが、本発明のシーリング材は比較的安価
である。[Function] The plugging material in the present invention is a sealing material, and unlike conventional solid plugs, it can be plastically deformed, so even if there is a slight accuracy error in the size or shape of the through hole, the plugging material can be easily deformed. Since it can deform on its own in response to any situation, it has extremely high sealing properties and good adhesion to plastic tubes.
Further, unlike foamed materials, there is no need to perform secondary processing, and it is possible to prevent an increase in production man-hours and a delay in production time. Furthermore, in the case of foamed material, it is often injected deep into the through hole, resulting in high material costs, but the sealing material of the present invention is relatively inexpensive.

そしてシーリング材の装填に当つては、予めこ
れをリング状キヤツプ（以下断面コ字状リング状
キヤツプともいう）に装入しておいて管端面へ一
気に嵌合して押圧するので、管の全周方向にみて
均一装填を行なうことができる。従つてシール性
のばらつきが無く、又部分的な過剰装入もおこら
ず、均一で且つ確実なシール効果を得ることがで
きる。 When loading the sealant, it is loaded in advance into a ring-shaped cap (hereinafter also referred to as a ring-shaped cap with a U-shaped cross section), and the sealant is fitted onto the tube end face at once and pressed, so that the sealant is completely inserted into the tube. Uniform loading can be performed when viewed in the circumferential direction. Therefore, there is no variation in sealing performance, no partial overcharging occurs, and a uniform and reliable sealing effect can be obtained.

一方プラスチツク管端部を拡径して受口を形成
する場合等には、第５図に示す様に、芯型６側か
ら矢印Ｍ方向に拡径力が作用するので、τｘ，τ
ｙ，τｚで示す様なフーブストレスが夫々矢印方
向に発生する。しかるにτｘ，τｚは断面積の小
さな部分に発生し、τｙは断面積の大きい部分に
発生するので、単位断面積当りのτｘ，τｚは、
単位断面積当りのτｙより大きくなる。その結
果、τｘの作用する管肉1xとτｚの作用する管
肉1zでは周方向の延伸に相違を生じ、第６図に
示す様に、加熱加工後の管断面に微細な小波状凹
凸７が発生する。この様な凹凸が発生すると、外
観が悪くなるだけでなく、他の管と嵌合して接続
したとき、特にパツキングを介在させて接続した
ときに、周方向のシール性能に支障をきたすとい
う不都合がある。 On the other hand, when expanding the diameter of the plastic tube end to form a socket, as shown in FIG. 5, a diameter expanding force acts from the core mold 6 side in the direction of arrow M, so
Houb stress as shown by y and τz occurs in the directions of the arrows. However, τx and τz occur in a small cross-sectional area, and τy occurs in a large cross-sectional area, so τx and τz per unit cross-sectional area are
It becomes larger than τy per unit cross-sectional area. As a result, there is a difference in elongation in the circumferential direction between the tube wall 1x where τx acts and the tube wall 1z where τz acts, and as shown in Fig. 6, fine small wavy irregularities 7 are formed on the tube cross section after heat processing. Occur. When such unevenness occurs, not only does the appearance deteriorate, but it also impedes sealing performance in the circumferential direction when fitting and connecting with other pipes, especially when connecting with packing interposed. There is.

ところで本発明では、この部分を芯型と外型の
間に挿入保持せしめておき、通孔内に流体を圧入
することによつて通孔１ｄを押し広げ、凹凸の形
成を回避することに成功した。尚シーリング材は
加圧流体を圧入したとき還状溝側へ押し付けられ
るので、シーリング材が通孔１ｄの内面に押し広
げられて十二分に充填されるので、通孔１ｄとの
内面に隙間が形成される様な恐れはない。又残る
他方側管端部も断面コ字状のリング状キヤツプで
通孔を閉塞する。この時も当該キヤツプの環状溝
内には予めシーリング材を装入しているので、キ
ヤツプの嵌合と同時に通孔の開口部を閉塞するこ
とができる。 By the way, in the present invention, this part is inserted and held between the core mold and the outer mold, and by pressurizing fluid into the through hole, the through hole 1d is expanded, and the formation of unevenness is successfully avoided. did. When the pressurized fluid is injected, the sealing material is pushed toward the circular groove side, so the sealing material is spread over the inner surface of the through hole 1d and is fully filled, leaving a gap between the inner surface and the through hole 1d. There is no fear that it will form. The remaining tube end on the other side also closes the through hole with a ring-shaped cap having a U-shaped cross section. At this time as well, since the sealing material is previously placed in the annular groove of the cap, the opening of the through hole can be closed at the same time as the cap is fitted.

［実施例］ 以下図面に基づいて本発明の構成を説明する
が、下記実施例は一具体例に過ぎず、前・後記の
趣旨に従つて種々設計を変更することは、いずれ
も本発明の技術的範囲に含まれる。第１図は本発
明に係る孔明プラスチツク管の例を示す断面説明
図である。孔明プラスチツク管１の受口１ａ及び
挿口１ｂの両端部に断面コ字状で全体としてリン
グ状のキヤツプ１０，１０が各々嵌合され、両端
部の通孔１ｄ入口側には、シーリング材１１が充
填される。[Example] The configuration of the present invention will be explained below based on the drawings, but the following example is only one specific example, and various changes in design in accordance with the spirit of the above and below are within the scope of the present invention. Included in technical scope. FIG. 1 is an explanatory cross-sectional view showing an example of the Kongming plastic tube according to the present invention. Caps 10, 10 each having a U-shaped cross section and a ring shape as a whole are fitted to both ends of the socket 1a and the insertion port 1b of the Kongming plastic tube 1, and a sealing material 11 is fitted to the entrance side of the through hole 1d at both ends. is filled.

また第７図〜第１３図及び第１４図ａ〜ｅは本
発明に係る孔明プラスチツク管の両端閉塞方法を
説明する概略要部断面図である。これらの図にお
いて、受口成形用芯型８には５段階の段違部８
ａ，８ｂ，８ｃ，８ｄ，８ｅが形成され、段違部
８ｃにはゴム型又は割れ型９及びパツキング係合
リング３が、その背面に当接する様に配置され
る。 Furthermore, FIGS. 7 to 13 and 14 a to e are schematic cross-sectional views of essential parts illustrating a method for closing both ends of a Kongming plastic tube according to the present invention. In these figures, the core mold 8 for socket molding has five stepped portions 8.
a, 8b, 8c, 8d, and 8e are formed, and a rubber mold or split mold 9 and a packing engagement ring 3 are arranged in the stepped portion 8c so as to come into contact with the back surface thereof.

リング状キヤツプ１０は外周側突出壁１０ａと
内周側突出壁１０ｂを有し、それらの先端は図に
示す如くテーパ状に面取りされ外周側突出壁１０
ａのテーパ１０a′は環状溝に背を向ける方向に、
又内周側突出壁１０ｂのテーパ１０b′は環状溝に
向う方向に形成される。 The ring-shaped cap 10 has an outer protruding wall 10a and an inner protruding wall 10b, the tips of which are tapered and chamfered as shown in the figure.
The taper 10a' of a is in the direction facing away from the annular groove,
Further, a taper 10b' of the inner peripheral protruding wall 10b is formed in a direction toward the annular groove.

まず一方の管端閉塞を行なうに当たつては、次
のステツプに沿つて作業を進める。 First, to close one end of the tube, proceed according to the following steps.

第１ステツプ シーリング材を装入したリング状キヤツプ１０
を加温された芯型８の段違部８ｄ奥部にセツトす
る。1st step Ring-shaped cap 10 filled with sealant
is set in the inner part of the stepped portion 8d of the heated core mold 8.

第２ステツプ 孔明プラスチツク管１は素材の可塑化温度迄加
温されて芯型のガイド部（段違部８ａ）に沿つて
挿込まれ、テーパ部や段違部８ｃによつて順次拡
径され、第８図の如くゴム型９やパツキング係合
リング３を乗り越えてリング状キヤツプ１０に向
う。尚リング状キヤツプ１０の内周側突出壁１０
ｂには、前述の如くテーパ面１０b′が形成されて
いるので、孔明プラスチツク管１の先端はリング
状キヤツプ１０の環状溝内へスムースに挿入され
る。このときキヤツプ１０内のシーリング材１１
は逃げることができないので、溝底面や管の非通
孔面に押され、各通孔１ｄへ分散する様に均一に
侵入することになる。Second step: The Kouming plastic tube 1 is heated to the plasticizing temperature of the material, inserted along the core-shaped guide part (stepped part 8a), and gradually expanded in diameter by the tapered part and the stepped part 8c. , as shown in FIG. 8, passing over the rubber mold 9 and the packing engagement ring 3 to the ring-shaped cap 10. In addition, the inner circumferential protruding wall 10 of the ring-shaped cap 10
Since the tapered surface 10b' is formed on the cap 10b as described above, the tip of the perforated plastic tube 1 can be smoothly inserted into the annular groove of the ring-shaped cap 10. At this time, the sealant 11 inside the cap 10
Since they cannot escape, they are pushed by the bottom of the groove or the non-perforated surface of the pipe and uniformly penetrate into each through hole 1d so as to be dispersed.

第３ステツプ ３〜４個程度に分割された外型１７が周方向か
ら型締めされ、第９図の状態が完成する。尚図例
では外型１７を後から型締めしたが、予め外型１
７をセツトしておき、外型１７と芯型８のリング
状隙間に孔明プラスチツク管１を押込む様にして
も同様に加工することができる。そして第９図の
状態に保持しつつ、第９図の右側に示す如く挿口
部１ｂの端面を覆う様な吹込治具１２を嵌合し、
ノズル１３から矢印方向に流体（空気や窒素ガス
等の気体又は加温水や油等の液体）を吹込むと、
通孔１ｄ内に流体が圧入される。これにより管１
の内外周面は芯型８及び外型１７に圧接され、第
５図、第６図において述べた様な小波状凹凸がな
くなる。又加圧流体の作用によりシーリング材の
通孔内での充填密度が向上する。尚第９図の１４
ａ，１４ｂはパツキングを示す。第９図に示す如
くリング状キヤツプ１０の外周側突出壁のテーパ
面１０a′は外型１７の周方向からの圧接をその全
面において受止めるので、面一の美麗な外観が形
成される。Third step: The outer mold 17, which has been divided into about 3 to 4 pieces, is clamped from the circumferential direction, and the state shown in FIG. 9 is completed. In the illustrated example, the outer mold 17 was clamped later, but the outer mold 1
7 is set in advance, and the Komei plastic tube 1 is pushed into the ring-shaped gap between the outer mold 17 and the core mold 8 to perform the same processing. Then, while maintaining the state shown in FIG. 9, a blowing jig 12 is fitted to cover the end surface of the insertion port 1b as shown on the right side of FIG.
When fluid (gas such as air or nitrogen gas or liquid such as heated water or oil) is blown in the direction of the arrow from the nozzle 13,
Fluid is forced into the through hole 1d. This allows tube 1
The inner and outer circumferential surfaces of the core mold 8 and the outer mold 17 are pressed against each other, and the small wave-like irregularities described in FIGS. 5 and 6 are eliminated. Furthermore, the filling density of the sealing material within the through hole is improved by the action of the pressurized fluid. 14 in Figure 9
a and 14b indicate packing. As shown in FIG. 9, the tapered surface 10a' of the outer peripheral protruding wall of the ring-shaped cap 10 receives pressure contact from the circumferential direction of the outer mold 17 on its entire surface, so that a beautiful flush appearance is formed.

こうして成形が一段落したところで、外型１７
と芯型８内に冷媒を導入し、外型１７の型締めを
緩めて冷風又は冷水を送る等の冷却手段を施し、
加工された成形管又は芯型８を、第１０図に示す
如く相対的に引離す方向に離脱して成形管を更に
冷却する。 When the molding is completed in this way, the outer mold 17
A refrigerant is introduced into the core mold 8, and cooling means such as loosening the mold clamping of the outer mold 17 and sending cold air or cold water are applied,
The processed molded tube or core mold 8 is removed in a direction in which it is relatively pulled apart as shown in FIG. 10, and the molded tube is further cooled.

尚ゴム型９を用いた場合はこれを第１１図の様
に変形して抜き去り、割型の場合はこれを分割し
て抜去する。 If a rubber mold 9 is used, it is deformed as shown in FIG. 11 and removed, and if a split mold is used, it is divided and removed.

前述の第１〜３ステツプによつて管の一方端で
ある受口１ａの管端閉塞を完了する。第１２図は
加工の完了した受口を示す断面図であり、こうし
て通孔１ｄの片側の閉塞が行なわれると共に、美
麗な外観を有する受口が形成される。尚受口の内
面においては内周側突出壁１０ｂと管内面が面一
であり、他方外面側においては外周側突出壁１０
ａのテーパ面１０a′と管外面が滑らかに連続して
いるので、たとえ何かに引掛ることがあつても、
リング状キヤツプ１０の突出壁１０ａ，１０ｂに
はとつかかりがなく、該リング状キヤツプ１０の
脱落が防止される。尚シーリング材１１の硬化が
十分に進めばシーリング材１１と通孔１ｄとの接
着力によつて強固な結合が得られるが、この硬化
が十分に進む迄の間は、キヤツプ１０の脱落の心
配もあるので、必要ならば第１３図に示す如く矢
印方向から力Ｆを加え、管１の外周側管壁１ｋ適
所毎或は全周に陥没させて抜け防止を図ることも
本発明に含まれる。 Through the first to third steps described above, the tube end closure of the socket 1a, which is one end of the tube, is completed. FIG. 12 is a cross-sectional view showing the socket after machining has been completed. In this way, one side of the through hole 1d is closed, and a socket with a beautiful appearance is formed. Note that on the inner surface of the socket, the inner protruding wall 10b and the inner surface of the tube are flush with each other, and on the other hand, on the outer surface, the outer protruding wall 10b is flush with the inner protruding wall 10b.
Since the tapered surface 10a' of a and the outer surface of the tube are smoothly continuous, even if it gets caught on something,
The protruding walls 10a, 10b of the ring-shaped cap 10 have no grip, and the ring-shaped cap 10 is prevented from falling off. If the sealing material 11 has sufficiently hardened, a strong bond can be obtained due to the adhesive force between the sealing material 11 and the through hole 1d, but until this hardening has sufficiently progressed, there is no need to worry about the cap 10 falling off. Therefore, if necessary, the present invention also includes applying a force F from the direction of the arrow as shown in FIG. 13 to cause the outer wall 1k of the tube 1 to cave in at appropriate places or around the entire circumference to prevent it from coming off. .

こうして受口側の閉塞が終了すると、引続き管
の他方側端部の閉塞加工を次のステツプに沿つて
行なう。 Once the socket side has been completely closed, the other end of the tube is closed in the next step.

第４ステツプ リング状で且つ断面コ字状の先端治具１５を芯
型８に嵌挿する。該先端治具１５は第１４図ａに
その断面を示す様に芯型８長手方向にノズル（流
体圧入孔）１６が形成され、該ノズル１６は先端
治具１５の円周方向に多数設けられている。Fourth step: A tip jig 15 having a ring shape and a U-shaped cross section is inserted into the core mold 8. The tip jig 15 has a nozzle (fluid press-in hole) 16 formed in the longitudinal direction of the core mold 8, as shown in the cross section in FIG. ing.

第５ステツプ 受口側の管端閉塞を終えた孔明プラスチツク管
１の挿口１ｂを加熱軟化し、該軟化部を芯型８に
沿つて嵌入し、軟化部の先端が先端治具１５の円
周状溝端部に突き当たるまで押込む［第１４図ｂ
に示す］。Fifth step: Heat and soften the insertion port 1b of the Komei plastic tube 1 whose tube end on the socket side has been closed, and fit the softened portion along the core mold 8, so that the tip of the softened portion is in the circle of the tip jig 15. Push it in until it hits the edge of the circumferential groove [Figure 14b
shown].

第６ステツプ 分割された外型１７を挿口１ｂ外周側から型締
めし、該挿口１ｂを芯型８及び外型１７によつて
保持する［第１４図ｃの状態］。このとき管の受
口端側から加圧流体を吹込むことは、既に受口側
の通孔の端が閉塞されているので不可能となつて
いる。そこで前記状態のまま先端治具１５のノズ
ル１６から加圧流体を矢印方向から吹込む。この
とき孔明プラスチツク管１の受口１ａ側の通孔開
口部は前述した様に既に閉塞されているので、加
圧流体は通孔１ｄ内を充満し、管の加熱軟化部内
外面を芯型８及び外型１７表面に圧接して滑らか
にする。その後芯型８及び外型１７を冷却して挿
口１ｂが変形しない程度に冷却して成形を完了し
た後、先端治具１５、芯型８及び外型１７から管
１を離脱する。特に挿口１ｂの外周面はパツキン
等に当接されることになるので、該外周面を均一
に仕上げておくことが好ましい。Sixth step: The divided outer mold 17 is clamped from the outer circumferential side of the socket 1b, and the socket 1b is held by the core mold 8 and the outer mold 17 [state shown in FIG. 14c]. At this time, it is impossible to inject pressurized fluid from the socket end of the tube because the end of the through hole on the socket side is already closed. Therefore, pressurized fluid is blown from the nozzle 16 of the tip jig 15 in the direction of the arrow while maintaining the above state. At this time, since the through hole opening on the socket 1a side of the plastic tube 1 is already closed as described above, the pressurized fluid fills the through hole 1d, and the inner and outer surfaces of the heat-softened part of the tube are heated to the core mold 8. and press it against the surface of the outer mold 17 to make it smooth. Thereafter, the core mold 8 and the outer mold 17 are cooled to such an extent that the insertion port 1b is not deformed to complete the molding, and then the tube 1 is removed from the tip jig 15, the core mold 8 and the outer mold 17. In particular, since the outer circumferential surface of the socket 1b will come into contact with a gasket or the like, it is preferable to finish the outer circumferential surface uniformly.

第７ステツプ 断面コ字状のリング状キヤツプ１０の環状溝内
にシーリング材１１を装入しておき［第１４図ｄ
の状態］、第４〜６ステツプによつて成形された
挿口１ｂ端を嵌合させ、通孔１ｄ内にシーリング
材を充填させる。Seventh step: A sealing material 11 is charged into the annular groove of the ring-shaped cap 10 having a U-shaped cross section [Fig.
], the end of the socket 1b formed in the fourth to sixth steps is fitted, and the through hole 1d is filled with a sealing material.

第１４図ｅは挿口１ｂにリング状キヤツプ１０
を嵌合させた状態を示す断面説明図である。 Figure 14e shows a ring-shaped cap 10 in the socket 1b.
FIG.

挿口側の外面は、受口内への挿入に当つてシー
ル用パツキングと摺接されるので、第１２図の如
く外周側突出壁１０ａを管外面より突出させてお
くことは不都合である。従つて第１４図ｂの外周
側突出壁１０ａに対しては、内周側突出壁の場合
と同様に環状溝側を向く様なテーパ面１０a″を形
成し、結局内外面を共に面一にしている。 Since the outer surface on the insertion port side comes into sliding contact with the sealing packing when inserted into the socket, it is inconvenient to make the outer circumferential protruding wall 10a protrude from the outer surface of the tube as shown in FIG. 12. Therefore, for the outer circumferential protruding wall 10a in FIG. 14b, a tapered surface 10a'' is formed so as to face the annular groove side, as in the case of the inner circumferential protruding wall, so that both the inner and outer surfaces are flush with each other. ing.

第１５，１６図は両受継手の両側において通孔
を閉塞する場合の手順を示す要部断面図、図の右
側（Ｌ側）端部を前述の方法によつて閉塞してお
き、次に図の左側（Ｑ側）を閉塞する手順を示
す。Ｌ側端は既に閉塞されているので、第１５図
においては、Ｑ側では嵌合部の形状をリング状キ
ヤツプと同一として先端治具１５をＱ側先端に嵌
合し、ノズル１６から加圧流体を吹込んでいる。
そして通孔１ｄは完全に封じられているので、Ｑ
側の凹凸は芯型８と外型１７の間に圧接され、第
９図の場合と同様に美麗な外観が形成される。そ
して受口の形状が変形しない程度に冷却された後
型開きして型から外す。次いで第１６図に示す様
にシーリング材１１が装入されたキヤツプ１０を
加工済みの受口端に嵌合し、必要により加熱を行
なつてシーリング材の硬化を促進することにより
両端閉塞工程を完了する。尚第１７図に示す如
く、接着剤接合タイプの単純拡径受口における通
孔閉塞にも本発明を利用することができる。 Figures 15 and 16 are main part sectional views showing the procedure for closing the through holes on both sides of both joints. The procedure for closing the left side (Q side) of the figure is shown. Since the L side end is already closed, in FIG. Injecting fluid.
And since the through hole 1d is completely sealed, Q
The unevenness on the side is pressed between the core mold 8 and the outer mold 17, and a beautiful appearance is formed as in the case of FIG. 9. After the socket is cooled to such an extent that the shape of the socket does not change, the mold is opened and removed from the mold. Next, as shown in FIG. 16, the cap 10 loaded with the sealant 11 is fitted into the processed socket end, and if necessary, heating is performed to accelerate the hardening of the sealant to complete the process of closing both ends. Complete. As shown in FIG. 17, the present invention can also be used to close a through hole in a simple diameter expansion socket of the adhesive bonding type.

リング状キヤツプの材質は特に制限されない
が、一般的にパイプと同質のプラスチツク製であ
ることが推奨されるが、必要に応じて硬質ゴムや
ステンレス鋼に置きかえることもできる。 The material of the ring-shaped cap is not particularly limited, but it is generally recommended that it be made of the same plastic as the pipe, but it can be replaced with hard rubber or stainless steel if necessary.

シーリング材は、コーキングやシーリングに用
いられる軟質の素材で構成されるが、第９図の工
程において柔軟に変形し、通孔の開口端から侵入
し得るものでなければならないから、加工条件下
においては相当に可塑性乃至流動性の良好なもの
であることが望まれる。即ち侵入後はある程度速
やかに硬化するものが必要であり、かかる要望を
いずれも満足するものとしては、２液型の熱硬化
性樹脂材料（例えばエポキシ系樹脂）、或は１液
型及び２液型の如何を問わずに利用できる熱硬化
性樹脂材料（例えばシリコン系樹脂やブチラール
樹脂等）、が例示され、時に応じては熱可塑性樹
脂（アクリル系樹脂等）がブチルゴム材を用いる
こともできる。これらのうち特に代表的なものは
エポキシ樹脂であるが、具体的な組成を例示する
と、例えばポリアミド系硬化剤を理論量よりも多
めに配合したエポキシ樹脂、或はDBP、コールタ
ール、ポリエチレングリコール、ポリプロピレン
グリコール等の可塑剤又は非反応性希釈剤を添加
したエポキシ樹脂等を使用することが望ましい。 The sealant is made of a soft material used for caulking and sealing, but it must be able to flexibly deform during the process shown in Figure 9 and enter from the open end of the through hole, so it cannot be used under the processing conditions. It is desired that the material has fairly good plasticity or fluidity. In other words, it is necessary to have a material that hardens fairly quickly after penetration, and two-component thermosetting resin materials (e.g., epoxy resins), one-component and two-component materials that satisfy both of these requirements are required. Examples include thermosetting resin materials (such as silicone resins and butyral resins) that can be used regardless of the type, and in some cases thermoplastic resins (acrylic resins, etc.) may also be used, as well as butyl rubber materials. . Among these, epoxy resins are particularly representative, but examples of specific compositions include, for example, epoxy resins containing a polyamide curing agent in a larger amount than the theoretical amount, DBP, coal tar, polyethylene glycol, It is desirable to use an epoxy resin or the like to which a plasticizer such as polypropylene glycol or a non-reactive diluent is added.

［発明の効果］ 本発明の孔明プラスチツク管は管路内外からの
通孔内への水等の侵入・漏出が完全に防止され、
同時に管の内外面に発生し易い小波状凹凸の形状
を防止することができる。[Effects of the Invention] The Komei plastic pipe of the present invention completely prevents water from entering and leaking into the through hole from inside and outside the pipe.
At the same time, it is possible to prevent small wavy irregularities that tend to occur on the inner and outer surfaces of the tube.

そして通孔開口端の閉塞は簡便な方法によつて
均一且つ確実に行なうことができるに至つた。 It has now become possible to uniformly and reliably close the opening end of the through hole using a simple method.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は本発明の孔明プラスチツク管の代表例
を示す断面図、第２図は管接合部の拡大断面図、
第３図は第２図における−線切断面相当図、
第４図は他の管体の例を示す拡大断面図、第５図
は加熱拡径時の圧力発生状況を示す説明図、第６
図は管体の周面に発生した小波状凹凸を示す端面
図、第７図〜第１３図及び第１４図ａ〜ｅは本発
明の製造手順を段階的に示す断面図、第１５，１
６図は両受継手において通孔の再開口部を閉干す
るときの工程説明図、第１７図は本発明の他の実
施例を示す断面図である。 １……パイプ、１ａ……受口、１ｂ……挿口、
２……地面、３……リング、４……パツキング。 FIG. 1 is a cross-sectional view showing a typical example of the Komei plastic tube of the present invention, FIG. 2 is an enlarged cross-sectional view of the tube joint,
Figure 3 is a diagram corresponding to the - line section in Figure 2;
Fig. 4 is an enlarged sectional view showing another example of a pipe body, Fig. 5 is an explanatory drawing showing the pressure generation situation during heating and diameter expansion, and Fig. 6
The figure is an end view showing small wave-like irregularities generated on the circumferential surface of the tube, FIGS.
FIG. 6 is an explanatory diagram of a process for closing and drying the re-opening portions of the through holes in both joints, and FIG. 17 is a sectional view showing another embodiment of the present invention. 1...Pipe, 1a...Socket, 1b...Socket,
2...Ground, 3...Ring, 4...Patzking.

Claims (1)

【特許請求の範囲】 １ 管壁に軸方向へ連続する通孔が多数形成され
てなる孔明プラスチツク管において、前記通孔の
両側管端部にシーリング材が充填されると共に、
前記孔明プラスチツク管の端部外周面、管端面及
び端部内周面に沿う様に断面コ字状に形成された
リング状キヤツプが、前記孔明プラスチツク管の
両側管端面に嵌合されることにより前記通孔が両
端部で閉塞されていることを特徴とする孔明プラ
スチツク管。 ２ 管壁に軸方向へ連続する通孔を多数形成して
なる孔明プラスチツク管における前記通孔を両端
部で閉塞する方法であつて、 管端部の全周に沿つて管端部の内壁側と外壁側
を挟んで嵌合される同心状突出壁を有する断面コ
字状に形成されたリング状キヤツプの環状溝内に
シーリング材を装入して該キヤツプを芯型に嵌挿
するステツプ、 管の一方側端部を軟化させ該軟化部を前記芯型
の外周又は芯型と外型の間に圧入し、前記キヤツ
プの環状溝に前記挿入管端を嵌合させることによ
つて前記シーリング材を各通孔の開口部から侵入
させて入口部に充満させるステツプ、 上記挿入管端部を芯型と外型で保持しつつ他方
端側から流体を圧入して上記軟化部の内外面を平
滑とし、これらの部分を冷却して一方端の閉塞を
終了するステツプ、 前記キヤツプの環状溝と略同形状の円周溝を有
し、且つ円周溝内に流体圧入孔を備えた先端治具
を芯型に嵌挿しておくステツプ、 前記ステツプによつて一方端の開口部が閉鎖さ
れた管の他方側端部を軟化させて該軟化部を芯型
の外周又は芯型と外型の間に圧入すると共に、該
管端部を前記先端治具に嵌め合わせるステツプ、 該管端部を芯型と外型で保持して前記流体圧入
孔から各通孔内に流体を圧入して、軟化部内外面
を平滑に成形するステツプ、 前記キヤツプと略同形状のキヤツプの環状溝内
にシーリング材を装入しておき、前記先端治具が
離脱された後の前記他方側管端部に該キヤツプを
嵌合してシーリング材を各通孔の開口部から侵入
させ管端を閉塞するステツプよりなることを特徴
とする孔明プラスチツク管の両端閉塞方法。[Scope of Claims] 1. In a perforated plastic tube in which a large number of axially continuous through holes are formed in the tube wall, both end portions of the through holes are filled with a sealing material, and
A ring-shaped cap having a U-shaped cross section along the outer circumferential surface, the tube end surface, and the inner circumferential surface of the end of the Komei plastic tube is fitted to both end surfaces of the Komei plastic tube. A Kongming plastic tube characterized in that the through hole is closed at both ends. 2. A method of closing the holes at both ends of a perforated plastic tube formed by forming a large number of holes continuous in the axial direction in the tube wall, the inner wall side of the tube end along the entire circumference of the tube end. a step of inserting a sealing material into an annular groove of a ring-shaped cap having a U-shaped cross section and having concentric protruding walls that are fitted across the outer wall side of the cap, and inserting the cap into the core mold; The sealing is achieved by softening one end of the tube, press-fitting the softened portion on the outer periphery of the core mold or between the core mold and the outer mold, and fitting the insertion tube end into the annular groove of the cap. A step in which the material enters through the opening of each through hole to fill the inlet, and the end of the insertion tube is held by a core mold and an outer mold, and fluid is pressurized from the other end to cover the inner and outer surfaces of the softened part. a step of smoothing the cap and cooling these portions to finish blocking one end; a tip fixing having a circumferential groove having approximately the same shape as the annular groove of the cap, and a fluid injection hole in the circumferential groove; A step of inserting the tool into the core mold, softening the other end of the tube whose opening at one end is closed by the step, and applying the softened part to the outer periphery of the core mold or between the core mold and the outer mold. a step of press-fitting the pipe end into the tip jig; holding the pipe end with a core mold and an outer mold, and press-fitting a fluid into each through hole from the fluid press-fitting hole; a step of smoothing the inner and outer surfaces of the softened part; charging a sealing material into an annular groove of a cap having approximately the same shape as the cap, and applying the sealant to the other tube end after the tip jig is removed; A method for closing both ends of a Kouming plastic tube, comprising the steps of fitting a cap and introducing a sealing material through the opening of each through hole to close the tube ends.