JP2695133B2 - Double wall tube - Google Patents
Double wall tubeInfo
- Publication number
- JP2695133B2 JP2695133B2 JP7100925A JP10092595A JP2695133B2 JP 2695133 B2 JP2695133 B2 JP 2695133B2 JP 7100925 A JP7100925 A JP 7100925A JP 10092595 A JP10092595 A JP 10092595A JP 2695133 B2 JP2695133 B2 JP 2695133B2
- Authority
- JP
- Japan
- Prior art keywords
- wall
- pipe
- double
- walled
- tube
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
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- Rigid Pipes And Flexible Pipes (AREA)
Description
【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION
【0001】[0001]
【産業上の利用分野】この発明は二重壁管、特に、環状
の山部および谷部を交互に備える外壁管と、この外壁管
の谷部の内面で外壁管と熱融着された平坦な内壁管とか
らなり、地中に埋設して使用可能な耐圧強度を有する二
重壁管に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double-walled pipe, in particular, an outer wall pipe having alternating peaks and valleys, and a flat wall heat-sealed to the outer wall pipe on the inner surface of the valley of the outer wall pipe. The present invention relates to a double-walled pipe having a pressure-resistant strength that can be used by being buried in the ground.
【0002】[0002]
【従来の技術】従来、地中埋設用の排水管等には二重壁
管が使用されている。特公平2−21477号公報に
は、環状の山部と谷部を交互に備える外壁の内面に筒状
の内壁が熱融着されてなる二重壁管が開示されている。
この二重壁管は、一端に挿口、他端に受口を備え、挿口
を除く部分では外壁の谷部の内面が内壁と熱融着され内
面に凹凸のない中空一体構造を形成している。内壁の内
径は、受口を除いて均一で、受口のみ挿口を嵌入できる
ように径大に構成されている。さらに挿口の外面には、
受口の内壁に押圧係合する凸状が設けられている。2. Description of the Related Art Conventionally, double-walled pipes have been used as drainage pipes for underground burial. Japanese Examined Patent Publication No. 2-21477 discloses a double-walled pipe in which a tubular inner wall is heat-sealed to the inner surface of an outer wall having annular peaks and valleys alternately.
This double-walled tube has an insertion opening at one end and a receiving opening at the other end, and the inner surface of the valley portion of the outer wall is heat-sealed to the inner wall at the portion excluding the insertion opening to form a hollow integral structure with no unevenness on the inner surface. ing. The inner diameter of the inner wall is uniform except for the receiving opening, and is configured to have a large diameter so that the insertion opening can be inserted only in the receiving opening. Furthermore, on the outer surface of the insertion port,
A convex shape that is press-engaged with the inner wall of the receiving port is provided.
【0003】なお、この種の二重壁管は、相対向する一
対の半割成形型を一定速度で同調走行させながら、その
凹凸状成形面上に押出機から外壁形成用の合成樹脂を押
し出し、上述した山部と谷部を備えた溶融樹脂外層を連
続成形すると共に、この外層の谷部内面に熱融着させて
溶融樹脂内層を形成する。こうして得られた成形品を硬
化後に離型し、その後、所定寸法のものに切断して分離
することにより製造されている。A double-walled pipe of this type pushes a synthetic resin for forming an outer wall from an extruder onto the concavo-convex molding surface while a pair of opposing half-molding dies are synchronously run at a constant speed. The molten resin outer layer having the above-mentioned peaks and valleys is continuously molded, and the inner surface of the valley of the outer layer is heat-fused to form the molten resin inner layer. The molded product thus obtained is released from the mold after curing, and then cut into pieces of a predetermined size and separated.
【0004】[0004]
【発明が解決すべき課題】上記の二重壁管では、受口の
内壁の内面が平坦であるため、接続状態において凸状及
び内壁の変形が必須であり、係合が阻止される方向に変
形が働いている。したがって、充分な係止力を得ること
は困難である。さらに、受口も外壁の谷部の内面が内壁
と熱融着された、内面に凹凸のない中空一体構造で形成
されているので、屈曲性に乏しく、非直線状となりやす
い実際の敷設作業に際して困難が伴う。In the above-mentioned double-walled pipe, since the inner surface of the inner wall of the receiving port is flat, the convex shape and the deformation of the inner wall are indispensable in the connected state, and the engagement is prevented. Deformation is working. Therefore, it is difficult to obtain a sufficient locking force. In addition, since the receiving port is also formed with a hollow integrated structure with the inner surface of the valley portion of the outer wall heat-sealed to the inner wall and with no unevenness on the inner surface, it has poor flexibility and is likely to be non-linear. There are difficulties.
【0005】この発明の目的は、挿口と受口の接続が確
実に行われかつこの接続部が適度な屈曲性を備えた二重
壁管を提供することにある。An object of the present invention is to provide a double-walled pipe in which the insertion port and the reception port are surely connected to each other, and the connection portion has appropriate flexibility.
【0006】[0006]
【課題を解決するための手段】この発明によれば、環状
の山部および谷部を軸方向に交互に備える外壁管と、こ
の外壁管の谷部の内面で外壁管と熱融着された平坦な内
壁管とからなる二重壁管であって、一端に挿口、他端に
受口を備え、挿口は前記外壁管と内壁管とが重なり合う
よう外壁管の端部が平坦に形成され、一方、受口は内壁
管が外壁管の内面に沿うよう密着されるとともにこの内
壁管の谷部の内径が前記挿口の外径とほぼ同一となるよ
う径方向に膨張されてなる二重壁管が提供される。According to the present invention, an outer wall tube having annular peaks and troughs alternately arranged in the axial direction, and an outer wall tube thermally fused to the inner surface of the trough of the outer wall tube. A double-walled pipe consisting of a flat inner-walled pipe, having an insertion opening at one end and a receiving opening at the other end, and the insertion opening is formed with a flat end portion of the outer-walled pipe so that the outer-walled pipe and the inner-walled pipe overlap each other. On the other hand, the receiving port is formed so that the inner wall pipe is closely attached along the inner surface of the outer wall pipe and is expanded in the radial direction so that the inner diameter of the valley portion of the inner wall pipe is substantially the same as the outer diameter of the insertion port. A heavy wall tube is provided.
【0007】この発明によれば、環状の山部および谷部
を交互に備える外壁管と、この外壁管の谷部の内面で外
壁管と熱融着された平坦な内壁管とからなる二重壁管で
あって、一端に挿口、他端に受口を備え、挿口は前記外
壁管と内壁管とが重なり合うよう外壁管の端部が平坦に
形成され、一方、受口は内壁管を欠くとともに外壁管の
谷部の内径が前記挿口の外径一となるよう外壁管のみか
ら形成されたことを特徴とする二重壁管が提供される。According to the present invention, the double wall is composed of an outer wall tube having annular peaks and valleys alternately, and a flat inner wall tube heat-sealed to the outer wall on the inner surface of the valley of the outer wall tube. A wall tube having an insertion opening at one end and a receiving opening at the other end, and the insertion opening is formed such that the end portion of the outer wall tube is flat so that the outer wall tube and the inner wall tube overlap each other, while the receiving opening is the inner wall tube. A double-walled pipe is provided which is formed only from the outer-walled pipe so that the inner diameter of the valley portion of the outer-walled pipe is equal to the outer diameter of the insertion port.
【0008】この発明における二重壁管とは、地中に埋
設して、あるいは、地表に敷設して排水管等に用いられ
る、所定の耐圧強度を有し、現場において挿口を受口の
内周側に嵌入することにより順次接続可能な管材をい
う。二重壁管は、相対向する一対の無端状半割成形型を
一定速度で同調走行させながら、その凹凸状成形面上に
押出機から外壁形成用の合成樹脂を押し出し、山部と谷
部を備えた溶融樹脂外層を連続成形すると共に、この外
層の谷部内面に熱融着させて溶融樹脂内層を形成する。
こうして得られた成形品を硬化後に離型し、その後、所
定寸法のものに切断して分離することにより製造されて
いる。The double-walled pipe according to the present invention has a predetermined compressive strength to be buried in the ground or laid on the ground surface and used as a drainage pipe, etc. A pipe material that can be sequentially connected by being fitted into the inner peripheral side. The double-walled pipe is a synthetic resin for forming the outer wall extruded from the extruder onto the concave-convex molding surface while the pair of endless half-molding halves facing each other are synchronously run at a constant speed. The molten resin outer layer having the above is continuously molded, and the inner surface of the valley portion of the outer layer is heat-fused to form the molten resin inner layer.
The molded product thus obtained is released from the mold after curing, and then cut into pieces of a predetermined size and separated.
【0009】上記の成形では、無端状半割成形型が1周
走行することにより、一端に挿口、他端に受口を備えた
二重壁管の定尺を成形可能な成形型および成形装置を用
いることが好ましい。In the above-mentioned molding, the endless half-molding die travels one round to form a standard length of a double-walled pipe having an insertion opening at one end and a receiving opening at the other end, and a molding die. It is preferable to use a device.
【0010】二重壁管の材質は合成樹脂、好ましくは、
オレフィン樹脂、塩化ビニル樹脂であり、特に、ポリエ
チレンが成形性、融着性および機械的強度の点で好まし
い。The material of the double-walled tube is synthetic resin, preferably,
It is an olefin resin or a vinyl chloride resin, and polyethylene is particularly preferable in terms of moldability, fusion property and mechanical strength.
【0011】挿口の少なくとも一部が、内壁管を欠いて
形成されることが好ましい。挿口は、その平坦な外壁管
表面から外方に突出して周方向に不連続に形成された複
数個の凸条からなる、複数の管を接続するための管接続
手段を有することが好ましい。なお、凸条は外壁管と一
体に成形されたものが好ましい。凸条は、外壁管の山部
の内側に収納可能で軸線方向の断面が略三角形を呈し、
さらに環状に3〜8個形成されたものが好ましい。凸条
は少なくとも3個を設ければ、均等でブレのない堅固な
係合が可能となる。It is preferable that at least a part of the insertion opening is formed by lacking the inner wall tube. It is preferable that the insertion port has a pipe connecting means for connecting a plurality of pipes, which is composed of a plurality of ridges protruding outward from the flat outer wall pipe surface and formed discontinuously in the circumferential direction. The ridge is preferably formed integrally with the outer wall tube. The ridge can be stored inside the mountain portion of the outer wall tube, and the cross section in the axial direction has a substantially triangular shape,
Further, it is preferable that 3 to 8 rings are formed. Providing at least three ridges enables uniform and firm engagement without blurring.
【0012】[0012]
【作用】この発明の二重壁管では、受口に挿口を嵌入す
る際、内壁管の谷部の内径が挿口の外径とほぼ同一であ
るので、挿口の外壁管が、受口の内壁管に嵌入される。
ここで、受口は内壁管が外壁管の内面に沿うよう密着し
て形成されておれば、管接続部には適度な屈曲性が確保
される。このため、現場における二重壁管の接続を伴う
敷設作業が容易になる。In the double-walled pipe of the present invention, when the insertion port is fitted into the receiving port, the inner diameter of the trough portion of the inner wall pipe is almost the same as the outer diameter of the insertion port, so that the outer wall tube of the insertion port receives It is fitted into the inner wall of the mouth.
Here, if the receiving wall is formed so that the inner wall tube is in close contact with the inner surface of the outer wall tube, an appropriate bendability is secured in the tube connecting portion. Therefore, the laying work involving the connection of the double-walled pipes on site becomes easy.
【0013】この発明の二重壁管では、受口に挿口を嵌
入する際、内壁管の谷部の内径が挿口の外径とほぼ同一
であるので、挿口の外壁管が、受口の内壁管に嵌入され
る。ここで、受口は内壁管が欠くよう形成されておれ
ば、管接続部には適度な屈曲性が確保される。このた
め、現場における二重壁管の接続を伴う敷設作業が容易
になる。In the double-walled pipe of the present invention, when the insertion port is fitted into the receiving port, the inner diameter of the trough portion of the inner wall pipe is substantially the same as the outer diameter of the insertion port, so that the outer wall tube of the insertion port receives It is fitted into the inner wall of the mouth. Here, if the receiving port is formed so as to lack the inner wall pipe, the pipe connecting portion can ensure appropriate flexibility. Therefore, the laying work involving the connection of the double-walled pipes on site becomes easy.
【0014】挿口の少なくとも一部が、内壁管を欠いて
形成されておれば、管接続部に適度な屈曲性が確保され
るので、現場における二重壁管の接続を伴う敷設作業が
容易になる。さらに、これらの二重壁管を互いに接続す
る際、受口に対する挿口の挿入の深さにより管の長さの
調節が可能であるため、二重壁管の接続を伴う敷設作業
が容易になる。If at least a part of the insertion opening is formed by lacking the inner wall pipe, the pipe connecting portion can have appropriate flexibility, so that the laying work involving the connection of the double wall pipe at the site is easy. become. Further, when connecting these double-walled pipes to each other, the length of the pipes can be adjusted by the depth of insertion of the insertion port with respect to the receiving port, which facilitates the laying work involving the connection of the double-walled pipes. Become.
【0015】挿口は、その平坦な外壁管表面から外方に
突出して周方向に不連続に形成された複数個の凸条から
なる、複数の管を接続するための管接続手段を有してお
れば、受口に挿口を嵌入する際、挿口の凸条が受口の内
面に係合し互いに接続される。このため、接続用継ぎ手
を別途用意する必要がない。受口の内面は、内壁管が外
壁管の内面に沿うよう密着して形成されているか、ある
いは内壁管を欠いて外壁管のみで形成されているので、
凸条が受口の内面の谷部に係合される。この接続状態に
おいて凸条及び内壁管の変形が生じないので、挿口の抜
け方向に充分な係止力が得られる。The insertion port has a pipe connecting means for connecting a plurality of pipes, which is composed of a plurality of ridges projecting outward from the flat outer wall pipe surface and formed discontinuously in the circumferential direction. With this configuration, when the insertion opening is inserted into the receiving opening, the ridges of the insertion opening engage with the inner surface of the receiving opening and are connected to each other. Therefore, it is not necessary to separately prepare a connection joint. The inner surface of the receiving port, the inner wall tube is formed so as to closely adhere to the inner surface of the outer wall tube, or because the inner wall tube is lacking and is formed only by the outer wall tube,
The ridge is engaged with the trough on the inner surface of the receptacle. In this connected state, since the ridge and the inner wall tube are not deformed, a sufficient locking force can be obtained in the insertion direction of the insertion opening.
【0016】凸条が、外壁管の山部の内側に収納可能で
軸線方向の断面が略三角形を呈し、さらに環状に3個形
成されたものであれば、受口に挿口を嵌入する際、凸条
が、受口の内面を容易に通過するとともに、少ない係止
点で挿口に適度な屈曲性を確保しながら挿口の抜け方向
に充分な係止力が得られる。If the ridge can be housed inside the ridge of the outer wall tube, has a substantially triangular cross section in the axial direction, and has three annular ridges, the ridge is inserted into the receptacle. The ridge easily passes the inner surface of the receiving opening, and a sufficient locking force can be obtained in the insertion direction of the insertion opening while ensuring appropriate flexibility at the insertion opening at a few locking points.
【0017】[0017]
〔実施例1〕この発明の一実施例による二重壁管を図1
〜図5の断面図に基づいて説明する。二重壁管1は、筒
状のポリエチレン樹脂製の内壁2と、その外周を取り囲
むポリエチレン樹脂製の外壁3とを有し、その一端部に
挿口4、他端部に受口5を備えている。外壁3は、挿口
4を形成する平坦部3cを除く全長にわたり環状の山部
3aおよび谷部3bを交互に備えている。[Embodiment 1] FIG. 1 shows a double wall tube according to an embodiment of the present invention.
~ It demonstrates based on the sectional view of FIG. The double-walled pipe 1 has a cylindrical inner wall 2 made of polyethylene resin and an outer wall 3 made of polyethylene resin surrounding the outer periphery thereof, and has an insertion port 4 at one end and a receiving port 5 at the other end. ing. The outer wall 3 is alternately provided with annular peaks 3a and valleys 3b over the entire length except the flat portion 3c forming the insertion opening 4.
【0018】内壁2は、外壁3の谷部3bの内面で外壁
3と熱融着された平坦部2cを備え、さらに、平坦部2
cに連続する受口5において環状の山部2aおよび谷部
2bを交互に備えている。挿口4は、外壁3と内壁2の
各平坦部3c、2cが重なり合うよう形成されている。
一方、受口5は、内壁2が外壁3の内面に沿うよう山部
3a、2aおよび谷部3b、2bが密着され、その内面
に凹凸を形成している。The inner wall 2 is provided with a flat portion 2c heat-sealed to the outer wall 3 on the inner surface of the valley portion 3b of the outer wall 3, and further the flat portion 2
An annular peak 2a and a valley 2b are alternately provided in the receiving port 5 continuous to c. The insertion port 4 is formed so that the flat portions 3c, 2c of the outer wall 3 and the inner wall 2 overlap each other.
On the other hand, in the receiving port 5, the ridges 3a, 2a and the valleys 3b, 2b are in close contact with each other so that the inner wall 2 extends along the inner surface of the outer wall 3, and the inner surface thereof has irregularities.
【0019】受口5は、a部を図2で示すように、内壁
2の谷部2bの内径が挿口4の外径とほぼ同一となるよ
う径方向に膨張された構成となっている。外壁3の平坦
部3cには、壁表面から外方に突出して周方向に不連続
に形成された複数個の凸条6が形成されている(図5参
照)。凸条6は、管接続手段として、内壁2の山部2a
内の空間に変形しない状態で収納可能であり、軸線方向
の断面は略三角形を呈し、環状に略等間隔で3個が形成
されている。凸条の壁表面からの高さは、挿口4の外径
が50〜300mmあれば、3〜10mmの範囲で形成
される。As shown in FIG. 2, the receiving opening 5 has a structure in which it is expanded in the radial direction so that the inner diameter of the valley portion 2b of the inner wall 2 becomes substantially the same as the outer diameter of the insertion opening 4. . The flat portion 3c of the outer wall 3 is formed with a plurality of ridges 6 projecting outward from the wall surface and formed discontinuously in the circumferential direction (see FIG. 5). The ridge 6 serves as a pipe connecting means and is a mountain portion 2a of the inner wall 2.
It can be stored in the inner space without being deformed, and the cross section in the axial direction has a substantially triangular shape, and three annular members are formed at substantially equal intervals. The height of the ridge from the wall surface is formed in the range of 3 to 10 mm if the outer diameter of the insertion port 4 is 50 to 300 mm.
【0020】上記した二重壁管1を接続するときは、図
3に示すように、互いに接続される2本の二重壁管1、
1の挿口4と受口5とを突き合わせた後、受口5に挿口
4を嵌入する。凸条6及び内壁2はわずかに変形し、凸
条6が内壁2の谷部2bを摺動しながら通過する。この
とき、挿口4と受口5の接合面に、必要に応じて予め接
着剤又はシーリング剤を塗布しておいてもよい。When connecting the above-mentioned double-walled pipes 1, as shown in FIG. 3, two double-walled pipes 1, which are connected to each other,
After the insertion opening 4 and the receiving opening 5 of 1 are butted, the insertion opening 4 is inserted into the receiving opening 5. The ridges 6 and the inner wall 2 are slightly deformed, and the ridges 6 pass while sliding along the valleys 2b of the inner wall 2. At this time, an adhesive or a sealing agent may be applied in advance to the joint surface between the insertion port 4 and the receiving port 5 as needed.
【0021】二重壁管1、1が接続されると、図4に示
すように、受口5において内壁2が外壁3の内面に沿う
よう挿口4の平坦部3cの外面は、受口5の谷部2bの
内面に密着する。このため、適度な屈曲性が確保され
る。この屈曲性は、現場における二重壁管1、1の敷設
作業を容易にする。When the double-walled pipes 1 and 1 are connected, as shown in FIG. 4, the outer surface of the flat portion 3c of the insertion slot 4 is set so that the inner wall 2 is along the inner surface of the outer wall 3 in the receptacle 5. It adheres closely to the inner surface of the valley portion 2b of No. 5. Therefore, proper flexibility is secured. This flexibility facilitates the work of laying the double-walled tubes 1, 1 in the field.
【0022】上記接続がなされた際、受口5の内面は、
b部を図5で示すように、挿口4の先端部4aが内壁2
の平坦部2cの終点に当接するとともに、凸条6が内壁
2の山部2a内に突出しその係止面6aが谷部2bの側
面に係合される。この接続状態において凸条6及び内壁
2には変形が生じないので、挿口4の抜け方向に充分な
係止力が得られる。When the above connection is made, the inner surface of the socket 5 is
As shown in FIG. 5 at part b, the tip 4a of the insertion port 4 has the inner wall 2
While contacting the end point of the flat portion 2c, the ridge 6 projects into the ridge portion 2a of the inner wall 2 and its locking surface 6a is engaged with the side surface of the valley portion 2b. In this connected state, the ridge 6 and the inner wall 2 are not deformed, so that a sufficient locking force can be obtained in the direction in which the insertion slot 4 is pulled out.
【0023】凸条6は、軸線方向の断面が略三角形で形
成されているので、受口5に挿口4を嵌入する際、凸条
6が、受口5の内面を小さい抵抗で通過するとともに、
挿口4の抜け方向に充分な係止力が得られる。Since the ridge 6 has a substantially triangular cross section in the axial direction, the ridge 6 passes through the inner surface of the receptacle 5 with a small resistance when the insertion slot 4 is fitted into the receptacle 5. With
A sufficient locking force can be obtained in the direction in which the insertion slot 4 is pulled out.
【0024】上記した二重壁管1の製造方法を図6及び
図7の成形装置10とあわせて説明する。図において成
形装置10は、溶融樹脂押出部11と、成形型12と、
冷却筒13とから主に構成されている。溶融樹脂押出部
11は、外壁押出用の第1押出口14と、内壁押出用の
第2押出口15及びノズル16から構成されている。押
出口14、15は、それぞれ図示しない樹脂押出装置に
接続されている。ノズル16の先端(図中右方)には、
成形型12との間に差圧部17が形成されている。A method of manufacturing the above-mentioned double-walled tube 1 will be described with reference to the molding apparatus 10 shown in FIGS. 6 and 7. In the figure, a molding apparatus 10 includes a molten resin extruding section 11, a molding die 12,
The cooling cylinder 13 is mainly included. The molten resin extruding section 11 is composed of a first extruding port 14 for extruding the outer wall, a second extruding port 15 for extruding the inner wall, and a nozzle 16. The extrusion ports 14 and 15 are connected to a resin extrusion device (not shown). At the tip of the nozzle 16 (right side in the figure),
A differential pressure portion 17 is formed between the molding die 12 and the molding die 12.
【0025】ノズル16は、その先端外周部で円環状に
開口する第1溶融樹脂通路21及びこのノズル16の先
端で前記通路21の同軸内周側で円環状に開口する第2
溶融樹脂通路22を有するとともに、差圧部17に通じ
る第1給気路31及び第2給気路32を有している。第
1給気路31は、第1溶融樹脂通路21における円環状
開口の内側で円環状に開口している。また、第2給気路
32は、第2溶融樹脂通路22における円環状開口のさ
らに内側で円環状に開口している。後述する成形型12
の裏面には、この型12を介して差圧部17と連通する
排気路33が形成されている。ノズル16の先端には、
冷却筒13が配置されている。The nozzle 16 has a first molten resin passage 21 which is annularly opened at the outer periphery of the tip end thereof and a second molten resin passage which is annularly opened at the tip of the nozzle 16 on the coaxial inner peripheral side of the passage 21.
In addition to having the molten resin passage 22, it also has a first air supply passage 31 and a second air supply passage 32 that communicate with the differential pressure section 17. The first air supply passage 31 opens in an annular shape inside the annular opening in the first molten resin passage 21. Further, the second air supply passage 32 opens in a ring shape further inside the ring opening in the second molten resin passage 22. Mold 12 to be described later
An exhaust passage 33 communicating with the pressure difference portion 17 through the mold 12 is formed on the back surface of the. At the tip of the nozzle 16,
The cooling cylinder 13 is arranged.
【0026】冷却筒13は、ノズル16と同軸上に配置
され、冷却水流通口13aを通して冷却水が供給される
構成となっている。成形型12は、管本体成形面A、受
口成形面B、挿口成形面Cを備え(図8参照)、受口成
形面Bと挿口成形面Cとは、連続するよう形成されてい
る。管本体成形面Aは、環状の凹部A1及び凸部A2を
交互に有する。また、受口成形面Bは、管本体成形面A
と同様に、環状の凹部B1及び凸部B2を交互に有す
る。The cooling cylinder 13 is arranged coaxially with the nozzle 16 and is configured to supply cooling water through the cooling water flow port 13a. The molding die 12 includes a pipe body molding surface A, a socket molding surface B, and an insertion molding surface C (see FIG. 8). The socket molding surface B and the insertion molding surface C are formed so as to be continuous. There is. The tube body molding surface A has annular concave portions A1 and convex portions A2 alternately. Further, the socket molding surface B is the tube body molding surface A.
Similarly, the ring-shaped concave portions B1 and the convex portions B2 are alternately provided.
【0027】凸部B2は、管本体成形面Aの凸部A2よ
り大径で構成されている。凹部B1は、管本体成形面A
の環状の凹部A1と同径の円筒状である。成形型12
は、一対の半割型に2分割されており、各半割型は、多
数のブロックを無端状に連結されてなり、これらが溶融
樹脂押出部11と冷却筒13の周囲で図6中矢印方向に
定位置で同調走行する構成となっている。成形型12
は、双方の半割型が1周走行することにより、一端に挿
口4、他端に受口5を備えた定尺の二重壁管が成形でき
るよう1組の管本体成形面A、受口成形面B及び挿口成
形面Cを備えた成形型である。The convex portion B2 has a diameter larger than that of the convex portion A2 on the molding surface A of the tube body. The recess B1 is formed on the tube body molding surface A.
It has a cylindrical shape with the same diameter as the annular recess A1. Mold 12
Is divided into a pair of half molds, and each half mold has a large number of blocks connected endlessly, and these are surrounded by the molten resin extruding portion 11 and the cooling cylinder 13 by arrows in FIG. It is configured to travel in a fixed position in the same direction. Mold 12
Is a set of pipe body molding surfaces A, so that both half molds can travel once to form a fixed-length double-walled pipe having an insertion opening 4 at one end and a receiving opening 5 at the other end. It is a molding die provided with a socket molding surface B and an insertion molding surface C.
【0028】このような成形装置10において、成形型
12を図中矢印方向に所定の速度で走行させながら、第
1溶融樹脂通路21及び第2溶融樹脂通路22を通して
溶融樹脂を連続して押し出し、同時に第1給気路31か
ら差圧部17内に給気するとともに排気路33から排気
する。また、図7に示すように、第2給気路32からの
給気は、受口成形面Bによって成形されている溶融樹脂
外層P1が、第2溶融樹脂通路22の開口周囲を通過し
ている時間帯でのみ行う。In the molding apparatus 10 as described above, the molten resin is continuously extruded through the first molten resin passage 21 and the second molten resin passage 22 while the molding die 12 is running in the direction of the arrow at a predetermined speed in the drawing, At the same time, air is supplied from the first air supply passage 31 into the differential pressure section 17 and is exhausted from the exhaust passage 33. Further, as shown in FIG. 7, in the air supply from the second air supply passage 32, the molten resin outer layer P1 formed by the inlet molding surface B passes around the opening of the second molten resin passage 22. Only during the hours that you are
【0029】第1溶融樹脂通路21から筒状に押し出さ
れた溶融樹脂は、差圧部17内に生じる内外の差圧によ
って、管本体成形面A、受口成形面B及び挿口成形面C
に押しつけられて溶融樹脂外層P1を形成し、各成形面
に沿う形状に成形される。他方、第2溶融樹脂通路22
から押し出された溶融樹脂は、排気路33からの排気に
よる吸引効果によって、既に成形されている溶融樹脂外
層P1の内面に付着して熱溶融し溶融樹脂内層P2を形
成する。The molten resin extruded in a cylindrical shape from the first molten resin passage 21 is formed by the internal and external differential pressure generated in the differential pressure portion 17, the pipe body molding surface A, the socket molding surface B and the insertion molding surface C.
Is pressed against to form a molten resin outer layer P1 and is molded into a shape along each molding surface. On the other hand, the second molten resin passage 22
The molten resin extruded from adheres to the inner surface of the already-molded molten resin outer layer P1 due to the suction effect of the exhaust from the exhaust passage 33 and heat-melts to form the molten resin inner layer P2.
【0030】受口成形面Bが第2給気路32出口を通過
するときは、第2給気路32から給気するとともに、排
気路33からの排気圧力を高めて内層P2が外層P1の
谷部内に膨出し、さらに、溶融樹脂外層P1の内面に溶
融樹脂内層P2が密着するよう押し出される。When the inlet molding surface B passes through the outlet of the second air supply passage 32, air is supplied from the second air supply passage 32 and the exhaust pressure from the exhaust passage 33 is increased so that the inner layer P2 becomes the outer layer P1. It swells into the valley portion and is further extruded so that the molten resin inner layer P2 is in close contact with the inner surface of the molten resin outer layer P1.
【0031】熱溶融された内外の溶融樹脂層P1、P2
は、その後、順次成形型12の走行にともなって冷却筒
13側へ送られ、冷却されて硬化し、その後離型され
る。得られた成形品Pは、管本体相当部106の軸方向
に等間隔で互いに連続する挿口相当部104と受口相当
部105を備えているので(図8)、挿口相当部104
と受口相当部105の境界部を切断線c−c、d−dに
沿って切断し分離する。これにより、定尺の二重壁管1
が得られる。なお、二重壁管1の定尺は、通常4〜5m
である。Thermally melted inner and outer molten resin layers P1 and P2
Then, the resin is sequentially sent to the cooling cylinder 13 side as the molding die 12 travels, cooled and hardened, and then released. The obtained molded product P includes the insertion port equivalent part 104 and the receiving port equivalent part 105 which are continuous with each other at equal intervals in the axial direction of the pipe body equivalent part 106 (FIG. 8), and therefore, the insertion port equivalent part 104.
And the boundary portion of the receiving port equivalent portion 105 are cut along the cutting lines c-c and d-d to separate them. As a result, the standard double-walled tube 1
Is obtained. The standard length of the double-walled tube 1 is usually 4 to 5 m.
It is.
【0032】上述したように、この二重壁管1では、受
口5に挿口4を嵌入する際、内壁2の谷部2bの内径が
挿口4の外径とほぼ同一であるので、挿口4の外壁3
が、受口5の内面に嵌入される。このため、これらの二
重壁管1を互いに接続する際、受口5に対する挿口4の
挿入の深さにより長さの調節が可能であるため、二重壁
管1の接続を伴う敷設作業が容易になる。受口5は内壁
2が外壁3の内面に沿うよう密着して形成されているの
で、接続部において撓み易くなり適度な屈曲性が確保さ
れる。このため、現場における二重壁管1の互いの接続
等、取り扱いが容易になる。As described above, in this double-walled pipe 1, when the insertion port 4 is fitted into the receiving port 5, the inner diameter of the valley portion 2b of the inner wall 2 is substantially the same as the outer diameter of the insertion port 4, Outer wall 3 of spigot 4
Is fitted into the inner surface of the receptacle 5. For this reason, when connecting these double-walled pipes 1 to each other, the length can be adjusted by the insertion depth of the insertion port 4 into the receiving port 5, so that the laying work involving the connection of the double-walled pipes 1 can be performed. Will be easier. Since the inner wall 2 of the receiving port 5 is formed in close contact with the inner surface of the outer wall 3, the receiving port 5 is easily bent at the connection portion, and appropriate flexibility is secured. Therefore, handling such as connecting the double-walled tubes 1 to each other in the field becomes easy.
【0033】挿口4は、その平坦な外壁3表面から外方
に突出する複数の凸条6を備えているので、受口5に挿
口4を嵌入する際、挿口4の凸条6が受口5の内面に係
合する。受口5の内面は、内壁2が外壁3の内面に沿う
よう密着して形成されているので、凸条6が受口5の内
面の谷部2bに係合される。この接続状態において凸条
6及び内壁2の変形が生じないので、挿口4の抜け方向
に充分な係止力が得られる。Since the insertion slot 4 is provided with a plurality of protrusions 6 protruding outward from the surface of the flat outer wall 3, when the insertion slot 4 is fitted into the receiving port 5, the protrusions 6 of the insertion slot 4 are inserted. Engages with the inner surface of the receptacle 5. Since the inner wall 2 is formed in close contact with the inner surface of the receiving port 5 along the inner surface of the outer wall 3, the ridge 6 is engaged with the valley portion 2b of the inner surface of the receiving port 5. In this connected state, the ridge 6 and the inner wall 2 are not deformed, so that a sufficient locking force can be obtained in the direction in which the insertion slot 4 is pulled out.
【0034】さらに、凸条6が、軸線方向の断面が略三
角形を呈しているので、受口5の内面を容易に通過す
る。凸条6を環状に3個設ければ、二重壁管1を互いに
接続した際、適度な屈曲性を確保しながら二重壁管1の
互いのブレがなく、かつ挿口4の抜け方向に充分な係止
力が得られる。二重壁管1は、接続用継ぎ手を別途用意
する必要がなく、また、接続されると外観上一本の管と
みなされるので、意匠として好ましい形態を有してい
る。Furthermore, since the ridge 6 has a substantially triangular cross section in the axial direction, it easily passes through the inner surface of the receiving port 5. If three ridges 6 are provided in an annular shape, when the double-walled pipes 1 are connected to each other, the double-walled pipes 1 do not shake each other while ensuring appropriate flexibility, and the insertion direction of the insertion port 4 is eliminated. A sufficient locking force can be obtained. The double-walled tube 1 does not need to separately prepare a joint for connection, and when it is connected, it is regarded as a single tube in appearance, and thus has a preferable form as a design.
【0035】〔実施例2〕図9〜図13は、受口が内壁
管を欠いて構成された二重壁管41の一例を示す。ここ
では、内壁42は、外壁43の谷部43bの内面で外壁
43と熱融着された平坦部42cを備え、この平坦部4
2cは受口45において欠如している。挿口44は、外
壁43と内壁42の各平坦部43c、42cが重なり合
うよう形成されている。受口45は、外壁43の山部4
3aおよび谷部43bが、その内面に凹凸を形成してい
る。[Embodiment 2] FIGS. 9 to 13 show an example of a double-walled pipe 41 having a receiving port lacking an inner wall pipe. Here, the inner wall 42 includes a flat portion 42c that is heat-sealed to the outer wall 43 on the inner surface of the valley portion 43b of the outer wall 43.
2c is missing at the socket 45. The insertion opening 44 is formed so that the flat portions 43c and 42c of the outer wall 43 and the inner wall 42 overlap each other. The receiving port 45 is the mountain portion 4 of the outer wall 43.
3a and the valley portion 43b form unevenness on the inner surface thereof.
【0036】受口45は、e部を図10で示すように、
外壁43の谷部43bの内径が挿口44の外径とほぼ同
一となるよう内壁42を欠いた構成となっている。外壁
43の平坦部43cには、壁表面から外方に突出して周
方向に不連続に形成された複数個の凸条46が形成され
ている。As shown in FIG. 10, the e-portion of the receiving port 45 is
The inner wall 42 is omitted so that the inner diameter of the valley portion 43b of the outer wall 43 is substantially the same as the outer diameter of the insertion opening 44. The flat portion 43c of the outer wall 43 is provided with a plurality of protruding ridges 46 protruding outward from the wall surface and discontinuous in the circumferential direction.
【0037】上記した二重壁管41を接続するときは、
図11に示すように、互いに接続される2本の二重壁管
41、41の挿口44と受口45とを突き合わせた後、
受口45に挿口44を嵌入する。凸条46及び外壁43
はわずかに変形し、凸条46が外壁43の谷部43bの
内面を摺動しながら通過する。When connecting the above-mentioned double-walled pipe 41,
As shown in FIG. 11, after the insertion ports 44 and the receiving ports 45 of the two double-walled pipes 41, 41 connected to each other are butted,
The insertion opening 44 is fitted into the receiving opening 45. Ridge 46 and outer wall 43
Is slightly deformed, and the ridge 46 passes while sliding on the inner surface of the valley portion 43b of the outer wall 43.
【0038】二重壁管41、41が接続されると、図1
2および同図f部を示す図13で表したように、受口4
5において挿口44の平坦部43cの外面は、受口45
の谷部43bの内面に密着する。これにより、接続部は
撓み易くなり、この屈曲性が現場における二重壁管41
の接続等、取り扱いを容易にする。When the double wall tubes 41, 41 are connected, FIG.
2 and FIG. 13 showing the part f in FIG.
5, the outer surface of the flat portion 43c of the insertion opening 44 is
It closely adheres to the inner surface of the valley portion 43b. As a result, the connecting portion is easily bent, and this bendability causes the double-wall pipe 41 in the field.
Easy to handle such as connecting.
【0039】〔実施例3〕図14〜図17は、挿口が内
壁管を欠いて構成された二重壁管51の一例を示す。こ
こでは、内壁52は、図17に示すように、外壁53の
谷部53bの内面で外壁53と熱融着された平坦部52
cを備え、平坦部52cに連続する受口55において環
状の山部52aおよび谷部52bを交互に備えている。
挿口54は、先端部分が内壁52を欠き、外壁53の平
坦部53cのみで形成されている。一方、受口55は、
内壁52が外壁53の内面に沿うよう山部53a、52
aおよび谷部53b、52bが密着され、その内面に凹
凸を形成している。[Embodiment 3] FIGS. 14 to 17 show an example of a double-walled pipe 51 in which the insertion opening is formed by omitting the inner wall pipe. Here, as shown in FIG. 17, the inner wall 52 is a flat portion 52 heat-sealed to the outer wall 53 on the inner surface of the valley portion 53 b of the outer wall 53.
In the receiving port 55 which is provided with c and which is continuous with the flat portion 52c, annular peaks 52a and valleys 52b are alternately provided.
The tip of the insertion port 54 lacks the inner wall 52, and is formed only by the flat portion 53c of the outer wall 53. On the other hand, the socket 55 is
The inner wall 52 is formed so that the inner wall 52 extends along the inner surface of the outer wall 53.
The a and the troughs 53b and 52b are in close contact with each other, and irregularities are formed on the inner surface thereof.
【0040】受口55は、内壁52の谷部52bの内径
が挿口54の外径とほぼ同一となるよう径方向に膨張さ
れた構成となっている。外壁53の平坦部53cには、
壁表面から外方に突出して周方向に不連続に形成された
複数個の凸条56が形成されている。The receiving port 55 is expanded in the radial direction so that the inner diameter of the valley portion 52b of the inner wall 52 is substantially the same as the outer diameter of the insertion port 54. In the flat portion 53c of the outer wall 53,
A plurality of protrusions 56 are formed so as to project outward from the wall surface and are discontinuous in the circumferential direction.
【0041】上記した二重壁管51を接続するときは、
図15に示すように、互いに接続される2本の二重壁管
51、51の挿口54と受口55とを突き合わせた後、
受口55に挿口54を嵌入する。凸条56及び内壁52
はわずかに変形し、凸条56が内壁52の谷部52bを
摺動しながら通過する。When connecting the above-mentioned double-walled pipe 51,
As shown in FIG. 15, after the insertion ports 54 and the receiving ports 55 of the two double-walled tubes 51, 51 connected to each other are butted,
The insertion port 54 is fitted into the receiving port 55. Ridge 56 and inner wall 52
Is slightly deformed, and the ridge 56 passes while sliding along the valley portion 52b of the inner wall 52.
【0042】二重壁管51、51が接続されると、図1
6および同図g部を示す図17で表したように、受口5
5において挿口54の平坦部53cの外面は、受口55
の内壁52の谷部52bの内面に密着する。これにより
接続部は撓み易くなり、この屈曲性が現場における二重
壁管51の接続等、取り扱いをさらに容易にする。When the double-walled tubes 51, 51 are connected, FIG.
6 and FIG. 17 showing part g of FIG.
5, the outer surface of the flat portion 53c of the insertion port 54 is
The inner surface of the inner wall 52 is closely attached to the inner surface of the valley portion 52b. As a result, the connecting portion is easily bent, and this bendability further facilitates handling such as connecting the double-walled pipe 51 in the field.
【0043】なお、上記した二重壁管41及び51を成
形する際は、受口成形面Bあるいは挿口成形面Cが差圧
部17を通過するときに、第2溶融樹脂通路22からの
溶融樹脂の押し出しを一時的に停止することにより各外
壁に相当する溶融樹脂外層P1のみを形成する。When molding the above-mentioned double-walled pipes 41 and 51, when the receiving port molding surface B or the insertion port molding surface C passes through the pressure difference portion 17, the pressure from the second molten resin passage 22 is increased. By temporarily stopping the extrusion of the molten resin, only the molten resin outer layer P1 corresponding to each outer wall is formed.
【0044】[0044]
【発明の効果】この発明の二重壁管によれば、受口に挿
口を嵌入する際、内壁管の谷部の内径が挿口の外径とほ
ぼ同一であるので、挿口の外壁管が、受口の内壁管に嵌
入される。ここで、受口は内壁管が外壁管の内面に沿う
よう密着して形成されておれば、受口には適度な屈曲性
が確保されている。このため、現場における二重壁管の
接続を伴う敷設作業が容易になる。According to the double-walled pipe of the present invention, when the insertion port is fitted into the receiving port, the inner diameter of the trough portion of the inner wall pipe is substantially the same as the outer diameter of the insertion port, so that the outer wall of the insertion port is The tube is fitted into the inner wall tube of the receptacle. Here, if the receiving wall is formed so that the inner wall tube is in close contact with the inner surface of the outer wall tube, the receiving port has a proper flexibility. Therefore, the laying work involving the connection of the double-walled pipes on site becomes easy.
【0045】この発明の二重壁管では、受口に挿口を嵌
入する際、内壁管の谷部の内径が挿口の外径とほぼ同一
であるので、挿口の外壁管が、受口の内壁管に嵌入され
る。ここで、受口は内壁管を欠くよう形成されておれ
ば、受口には適度な屈曲性が確保されている。このた
め、現場における二重壁管の接続を伴う敷設作業が容易
になる。In the double-walled pipe of the present invention, when the insertion port is fitted into the receiving port, the inner diameter of the trough portion of the inner wall pipe is almost the same as the outer diameter of the insertion port, so that the outer wall tube of the insertion port receives It is fitted into the inner wall of the mouth. Here, if the receiving port is formed so as to lack the inner wall tube, the receiving port has a proper flexibility. Therefore, the laying work involving the connection of the double-walled pipes on site becomes easy.
【0046】挿口の少なくとも一部が、内壁管を欠いて
形成されておれば、挿口には適度な屈曲性が確保される
ので、現場における二重壁管の接続を伴う敷設作業が容
易になる。さらに、これらの二重壁管を互いに接続する
際、受口に対する挿口の挿入の深さにより管の長さの調
節が可能であるため、二重壁管の接続を伴う敷設作業が
容易になる。If at least a part of the insertion port is formed by lacking the inner wall pipe, the insertion port can ensure appropriate flexibility, so that the laying work involving the connection of the double wall pipe at the site is easy. become. Further, when connecting these double-walled pipes to each other, the length of the pipes can be adjusted by the depth of insertion of the insertion port with respect to the receiving port, which facilitates the laying work involving the connection of the double-walled pipes. Become.
【0047】挿口は、その平坦な外壁管表面から外方に
突出して周方向に不連続に形成された複数個の凸条から
なる、複数の管を接続するための管接続手段を有してお
れば、受口に挿口を嵌入する際、挿口の凸条が受口の内
面に係合し互いに接続される。このため、接続用継ぎ手
を別途用意する必要がない。The insertion port has a pipe connecting means for connecting a plurality of pipes, which is formed of a plurality of convex strips projecting outward from the flat outer wall pipe surface and formed discontinuously in the circumferential direction. With this configuration, when the insertion opening is inserted into the receiving opening, the ridges of the insertion opening engage with the inner surface of the receiving opening and are connected to each other. Therefore, it is not necessary to separately prepare a connection joint.
【0048】受口の内面は、内壁管が外壁管の内面に沿
うよう密着して形成されているか、あるいは内壁管を欠
いて外壁管のみで形成されているので、凸条が受口の内
面の谷部に係合される。この接続状態において凸条及び
内壁管の変形が生じないので、挿口の抜け方向に充分な
係止力が得られる。The inner surface of the receiving port is formed so that the inner wall tube is closely attached along the inner surface of the outer wall tube or is formed only by the outer wall tube without the inner wall tube. Are engaged in the valleys of the. In this connected state, since the ridge and the inner wall tube are not deformed, a sufficient locking force can be obtained in the insertion direction of the insertion opening.
【0049】凸条が、外壁管の山部の内側に収納可能で
軸線方向の断面が略三角形を呈し、さらに環状に3個形
成されたものであれば、受口に挿口を嵌入する際、凸条
が、受口の内面を容易に通過するとともに、少ない係止
点で挿口に適度な屈曲性を確保しながら挿口の抜け方向
に充分な係止力が得られる。When the ridge can be stored inside the mountain portion of the outer wall tube and has a cross section in the axial direction of a substantially triangular shape, and further, three ridges are formed in an annular shape, when the insertion port is fitted into the receiving port. The ridge easily passes the inner surface of the receiving opening, and a sufficient locking force can be obtained in the insertion direction of the insertion opening while ensuring appropriate flexibility at the insertion opening at a few locking points.
【0050】受口に挿口を嵌入する際、内壁管の谷部の
内径が挿口の外径とほぼ同一であるので、挿口の外壁管
が、受口の内壁管に嵌入される。ここで、受口は内壁管
が外壁管の内面に沿うよう密着して形成されておれば、
受口には適度な屈曲性が確保されている。このため、現
場における二重壁管の接続を伴う敷設作業が容易にな
る。When the insertion opening is inserted into the receiving opening, the inner diameter of the trough portion of the inner wall opening is substantially the same as the outer diameter of the insertion opening, so that the outer wall opening of the insertion opening is inserted into the inner wall opening of the receiving opening. Here, if the receiving port is formed in close contact with the inner wall pipe along the inner surface of the outer wall pipe,
The socket has a proper flexibility. Therefore, the laying work involving the connection of the double-walled pipes on site becomes easy.
【0051】このように、本願発明によれば、挿口と受
口の接続が確実に行われかつこの接続部が適度な屈曲性
を備えた二重壁管が提供される。As described above, according to the present invention, there is provided a double-walled pipe in which the insertion port and the reception port are surely connected to each other and the connection portion has an appropriate flexibility.
【図1】この発明の一実施例による二重壁管を示す断面
図。FIG. 1 is a cross-sectional view showing a double wall tube according to an embodiment of the present invention.
【図2】図1の二重壁管のa部拡大図。FIG. 2 is an enlarged view of a portion of the double-walled tube in FIG.
【図3】図1の二重壁管の接続手順を示す断面図。FIG. 3 is a cross-sectional view showing a connection procedure of the double-walled pipe of FIG.
【図4】図1の二重壁管の接続状態を示す断面図。FIG. 4 is a cross-sectional view showing a connected state of the double-walled pipe of FIG.
【図5】図4の二重壁管のb部拡大図。5 is an enlarged view of a portion b of the double-walled pipe in FIG.
【図6】図1の二重壁管を形成する成形装置の概略断面
図。6 is a schematic cross-sectional view of a molding apparatus that forms the double-walled tube of FIG.
【図7】図6の成形装置のノズル先端付近を示す一部拡
大断面図。7 is a partially enlarged cross-sectional view showing the vicinity of the nozzle tip of the molding apparatus of FIG.
【図8】図6の二重壁管成形装置による成形品及びその
成形面の断面図。8 is a cross-sectional view of a molded product and its molding surface by the double-walled pipe molding apparatus of FIG.
【図9】この発明の他の実施例による二重壁管の断面
図。FIG. 9 is a cross-sectional view of a double wall tube according to another embodiment of the present invention.
【図10】図9の二重壁管のe部拡大図。10 is an enlarged view of an e portion of the double-walled pipe in FIG.
【図11】図9の二重壁管の接続手順を示す断面図。11 is a cross-sectional view showing a connection procedure of the double-walled pipe of FIG.
【図12】図9の二重壁管の接続状態を示す断面図。12 is a cross-sectional view showing a connected state of the double-walled pipe of FIG.
【図13】図12の二重壁管のf部拡大図。13 is an enlarged view of an f portion of the double-walled pipe in FIG.
【図14】この発明のさらに他の実施例による二重壁管
の断面図。FIG. 14 is a cross-sectional view of a double wall tube according to still another embodiment of the present invention.
【図15】図14の二重壁管の接続手順を示す断面図。15 is a cross-sectional view showing a connection procedure of the double-walled pipe of FIG.
【図16】図14の二重壁管の接続状態を示す断面図。16 is a cross-sectional view showing a connected state of the double-walled pipe of FIG.
【図17】図16の二重壁管のg部拡大図。FIG. 17 is an enlarged view of part g of the double-walled tube of FIG.
【符号の説明】 1 二重壁管 2 内壁 2a 山部 2b 谷部 3 外壁 3a 山部 3b 谷部 4 挿口 5 受口 6 凸条 41 二重壁管 51 二重壁管[Explanation of Codes] 1 double wall pipe 2 inner wall 2a mountain part 2b valley part 3 outer wall 3a mountain part 3b valley part 4 insertion port 5 receiving port 6 convex strip 41 double wall pipe 51 double wall pipe
Claims (5)
備える外壁管と、この外壁管の谷部の内面で外壁管と熱
融着された平坦な内壁管とからなる二重壁管であって、 一端に挿口、他端に受口を備え、挿口は前記外壁管と内
壁管とが重なり合うよう外壁管の端部が平坦に形成さ
れ、一方、受口は内壁管が外壁管の内面に沿うよう密着
されるとともにこの内壁管の谷部の内径が前記挿口の外
径とほぼ同一となるよう径方向に膨張されてなる二重壁
管。1. A double wall composed of an outer wall tube having annular peaks and troughs alternately arranged in the axial direction, and a flat inner wall tube heat-sealed to the outer wall tube on the inner surface of the trough of the outer wall tube. A pipe having an insertion port at one end and a receiving port at the other end, the insertion port having a flat end portion of the outer wall pipe so that the outer wall pipe and the inner wall pipe overlap each other, while the receiving port has an inner wall pipe. A double-walled pipe which is closely attached along the inner surface of the outer wall pipe and is radially expanded so that the inner diameter of the valley portion of the inner wall pipe is substantially the same as the outer diameter of the insertion opening.
壁管と、この外壁管の谷部の内面で外壁管と熱融着され
た平坦な内壁管とからなる二重壁管であって、 一端に
挿口、他端に受口を備え、挿口は前記外壁管と内壁管と
が重なり合うよう外壁管の端部が平坦に形成され、一
方、受口は内壁管を欠くとともに外壁管の谷部の内径が
前記挿口の外径とほぼ同一となるよう外壁管のみから形
成されたことを特徴とする二重壁管。2. A double-walled pipe comprising an outer wall pipe having alternating annular peaks and valleys, and a flat inner wall pipe heat-sealed to the outer wall at the inner surface of the valley of the outer wall pipe. The end of the outer wall pipe is formed flat so that the outer wall pipe and the inner wall pipe overlap with each other, while the receiving end lacks the inner wall pipe and the outer wall. A double-walled pipe formed only from an outer wall pipe so that an inner diameter of a valley portion of the pipe is substantially equal to an outer diameter of the insertion opening.
て形成されたことを特徴とする請求項1または請求項2
記載の二重壁管。3. The method according to claim 1, wherein at least a part of the insertion opening is formed by lacking the inner wall tube.
Double wall tube as described.
に突出して周方向に不連続に形成された複数個の凸条か
らなる、複数の管を接続するための管接続手段を有する
請求項1〜3のいずれかに記載の二重壁管。4. A pipe connecting means for connecting a plurality of pipes, wherein the insertion port is composed of a plurality of ridges projecting outward from the flat outer wall pipe surface and formed discontinuously in the circumferential direction. The double-walled pipe according to any one of claims 1 to 3, which has.
で軸線方向の断面が略三角形を呈し、さらに環状に3〜
8個形成されたことを特徴とする請求項4記載の二重壁
管。5. The ridge can be housed inside the mountain portion of the outer wall pipe, has a cross section in the axial direction of a substantially triangular shape, and further has a ring shape of 3 to 3.
The double-walled pipe according to claim 4, wherein eight double-walled pipes are formed.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7100925A JP2695133B2 (en) | 1995-04-25 | 1995-04-25 | Double wall tube |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7100925A JP2695133B2 (en) | 1995-04-25 | 1995-04-25 | Double wall tube |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH08296773A JPH08296773A (en) | 1996-11-12 |
JP2695133B2 true JP2695133B2 (en) | 1997-12-24 |
Family
ID=14286934
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP7100925A Expired - Lifetime JP2695133B2 (en) | 1995-04-25 | 1995-04-25 | Double wall tube |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2695133B2 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP6549292B1 (en) * | 2018-07-10 | 2019-07-24 | ニッタ株式会社 | Tube and method of manufacturing tube |
JP2021120589A (en) * | 2020-01-31 | 2021-08-19 | 古河電気工業株式会社 | Polyolefine resin double-wall square conduit, pipeline for double-wall square conduit, and method of inserting cables in pipeline for double-wall square conduit |
-
1995
- 1995-04-25 JP JP7100925A patent/JP2695133B2/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
JPH08296773A (en) | 1996-11-12 |
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