JP2547178B2 - Pressure resistant synthetic resin pipe - Google Patents
Pressure resistant synthetic resin pipeInfo
- Publication number
- JP2547178B2 JP2547178B2 JP5346150A JP34615093A JP2547178B2 JP 2547178 B2 JP2547178 B2 JP 2547178B2 JP 5346150 A JP5346150 A JP 5346150A JP 34615093 A JP34615093 A JP 34615093A JP 2547178 B2 JP2547178 B2 JP 2547178B2
- Authority
- JP
- Japan
- Prior art keywords
- pipe
- synthetic resin
- peripheral surface
- pressure
- outer peripheral
- 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 - Fee Related
Links
Landscapes
- Rigid Pipes And Flexible Pipes (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は耐圧強度が要求される電
線保護管その他の地中埋設管として使用に適した耐圧合
成樹脂管に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure resistant synthetic resin tube suitable for use as a wire protection tube or other underground buried tube which is required to have pressure resistance.
【０００２】[0002]
【従来の技術】従来から、地中埋設管としては耐圧強度
が要求されることから、ヒューム管や鋳鉄管などが使用
されているが、径の割りには重量が大きくなって取扱い
難く、施工性に難点を有するものである。このため、図
３に示すように、ポリエチレン等の硬質合成樹脂により
管壁Ａの外周面に一定のピッチを存して断面矩形状ない
しは台形状の中空螺旋突条Ｂを一体的に設け、この中空
螺旋突条Ｂによって土圧等の外圧に対する強度を増大さ
せてなる耐圧合成樹脂管が開発された。2. Description of the Related Art Conventionally, since fume pipes and cast iron pipes have been used as underground buried pipes, which are required to have pressure resistance, they are heavy due to their diameter and are difficult to handle. It has a difficulty in sex. Therefore, as shown in FIG. 3, a hollow spiral ridge B having a rectangular cross section or a trapezoidal cross section is integrally provided on the outer peripheral surface of the pipe wall A with a hard synthetic resin such as polyethylene. A pressure resistant synthetic resin pipe has been developed in which the hollow spiral ridge B increases the strength against external pressure such as earth pressure.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、このよ
うな合成樹脂管によれば、管壁Ａの外周面に螺旋状に巻
着している中空螺旋突条Ｂの隣接する突条部ｂ、ｂにお
いて、その対向側壁部b1、b2間に一定の間隔部ｃを設け
ているので、突条部ｂの頂面に外圧が作用した場合、隣
接する突条部にその外圧を分散支持させることができ
ず、突条部ｂが夫々にかゝる外圧を単独で受止すること
になって図４(1) に示すように、突条部ｂが全体的に傾
斜変形したり、同図(3) に示すように突条部ｂの両側壁
部b1、b2が座屈し、さらには、同図(2) に示すように突
条部ｂの頂面b3も内方に屈曲変形し、一旦形状が変形す
ると極度に強度が低下することになる。特に外圧が一定
部分の突条部に集中した場合には上記のような変形が著
しく生じて全体的な耐圧強度が劣り、しかも大径管にな
ればなる程、その強度の低下が生じるという問題点があ
った。本発明はこのような問題点を解消した耐圧合成樹
脂管の提供を目的とするものである。However, according to such a synthetic resin pipe, the adjacent ridge portions b, b of the hollow spiral ridge B spirally wound around the outer peripheral surface of the pipe wall A. In the above, since the constant space c is provided between the opposing side wall portions b 1 and b 2 , when an external pressure acts on the top surface of the protrusion b, the external pressure is dispersed and supported by the adjacent protrusions. Therefore, the ridges b individually receive the respective external pressures, and as shown in FIG. 4 (1), the ridges b are entirely inclined and deformed. As shown in Fig. (3), both side walls b 1 and b 2 of the ridge b are buckled, and as shown in Fig. 2 (2), the top surface b 3 of the ridge b is also inward. Once it is bent and deformed and its shape is deformed, the strength is extremely reduced. In particular, when the external pressure is concentrated on a certain portion of the ridge, the above-mentioned deformation occurs remarkably and the overall pressure resistance is inferior, and the larger the diameter of the pipe, the more the strength decreases. There was a point. An object of the present invention is to provide a pressure resistant synthetic resin pipe that solves such problems.
【０００４】[0004]
【課題を解決するための手段】上記目的を達成するため
に、本発明の耐圧合成樹脂管は、実施例に対応する図面
に示すように、合成樹脂製内管１の外周面に硬質合成樹
脂よりなる断面中空円形のパイプ２を隣接するパイプ部
分２ａ、２ａの外周対向面同士が互いに密接した状態と
なるように連続螺旋状に巻回、固着して中空補強体を形
成してあり、この中空補強体の外周面に合成樹脂製外管
３を被嵌状態に固着してなる構造を有するものである。In order to achieve the above object, a pressure-resistant synthetic resin pipe of the present invention is provided with a hard synthetic resin pipe on the outer peripheral surface of a synthetic resin inner pipe 1 as shown in the drawings corresponding to the embodiments.
Pipe section 2a adjacent the sectional hollow circular pipe 2 made of fat, and a state where the outer circumferential face surfaces of 2a closely to each other
So as to continuously helically winding, form a hollow reinforcing body fixed
The hollow reinforcing member has a structure in which a synthetic resin outer tube 3 is fixedly fitted to the outer peripheral surface of the hollow reinforcing member .
【０００５】[0005]
【作用】外管３に土圧等の外圧が作用した場合、該管３
の内周面に一体的に密着している連続螺旋巻パイプ２に
該圧力が分散するように作用する。この圧力によって該
螺旋巻パイプ２が圧縮しようとするが、隣接するパイプ
部分2a、2aの外周対向面同士が密接しているので、互い
に反発し合って夫々の変形を防止することになり、その
反発力によって大きな耐圧強度を発揮するものである。
又、螺旋巻パイプ２は断面円形であるために、外圧が作
用した時に生じる圧縮応力をその全周に亘って均一に分
散させ、座屈等の部分な変形を生じさせることなく耐圧
強度が一層増大するものである。[Operation] When an external pressure such as earth pressure acts on the outer pipe 3, the outer pipe 3
The pressure acts on the continuous spirally wound pipe 2 that is in intimate contact with the inner peripheral surface of the pipe. The spiral wound pipe 2 tries to compress due to this pressure, but since the outer peripheral facing surfaces of the adjacent pipe portions 2a, 2a are in close contact with each other, they repel each other to prevent their respective deformations. The repulsive force exerts a large pressure resistance.
Further, since the spirally wound pipe 2 has a circular cross section, the compressive stress generated when an external pressure is applied is uniformly dispersed over the entire circumference thereof, and the pressure resistance is further improved without causing partial deformation such as buckling. It will increase.
【０００６】[0006]
【実施例】本発明の実施例を図面について説明すると、
１は全長に亘って一定厚みを有し、且つ内外周面が平滑
面に形成されている合成樹脂製内管で、その外周面に一
定の外径と厚みを有する合成樹脂製小径パイプ２を、内
管１に一巻きされた隣接するパイプ部分2a、2aの対向外
周面同士が互いに密接した状態にして連続螺旋状に巻着
してあり、さらにこの小径螺旋巻パイプ２によって形成
された中空補強体の外周面に全長に亘って一定径の合成
樹脂製外管3 を被嵌状態に固着させてある。Embodiments of the present invention will now be described with reference to the drawings.
Reference numeral 1 denotes a synthetic resin inner pipe having a constant thickness over the entire length and having a smooth inner and outer peripheral surface, and a synthetic resin small-diameter pipe 2 having a constant outer diameter and thickness on the outer peripheral surface thereof. A hollow formed by the small-diameter spirally wound pipe 2 in which the opposite outer peripheral surfaces of the adjacent pipe portions 2a, 2a wound around the inner pipe 1 are wound in a continuous spiral shape in close contact with each other. An outer tube 3 made of synthetic resin having a constant diameter is fixed to the outer peripheral surface of the reinforcing body in a fitted state over the entire length.
【０００７】従って、内管１の外周面と外管３の内周面
との間で形成された環状空間部に中空補強体となる小径
螺旋巻パイプ２が介在し、そのパイプ２の一巻き状の各
パイプ部分2a、2a・・・2aは、上述したように対向する
外周面部を互いに密接させていると共に内側及び外側の
外周面部を内管１の外周面と外管３の内周面とに夫々密
着させた状態となっており、隣接するパイプ部分2a、2a
間とその部分の内外管１、３の内周面間に三角形状の内
外空隙部４、５が形成されているものである。Therefore, the small-diameter spirally wound pipe 2 serving as a hollow reinforcing member is interposed in the annular space formed between the outer peripheral surface of the inner pipe 1 and the inner peripheral surface of the outer pipe 3, and one turn of the pipe 2 is wound. Each of the pipe-shaped pipe portions 2a, 2a ... 2a has the outer peripheral surface portions facing each other in close contact with each other as described above, and the inner and outer peripheral surface portions have an outer peripheral surface of the inner pipe 1 and an inner peripheral surface of the outer pipe 3. Are in close contact with each other, and adjacent pipe parts 2a, 2a
Triangular inner and outer void portions 4 and 5 are formed between the inner peripheral surfaces of the inner and outer tubes 1 and 3 in the space.
【０００８】内外管１、３並びに小径パイプ２は、ポリ
エチレン等の比較的硬質な合成樹脂材によって形成され
ているが、その他の適宜な合成樹脂材を採用することも
できる。なお、パイプ部分2a、2a同士並びにパイプ部分
2aと内外管１、３との密接部は、摺動可能に接触させて
おいてもよいが、一体に接着させておくことが好まし
い。The inner and outer pipes 1 and 3 and the small diameter pipe 2 are made of a relatively hard synthetic resin material such as polyethylene, but other suitable synthetic resin materials may be used. Note that the pipe portions 2a, 2a and the pipe portions
The intimate contact portion between 2a and the inner and outer tubes 1 and 3 may be slidably in contact with each other, but preferably adhered integrally.
【０００９】このように形成された耐圧合成樹脂管は、
電線保護管や排水管その他の地中埋設管として使用さ
れ、外管３に土圧等の外圧が作用した場合には、該外管
３の内周面に連続螺旋巻小径パイプ２の各パイプ部分2a
の外側外周面部が一体的に密着６しているこれらのパイ
プ部分2aにその圧力が分散される。そして、この圧力に
よって該螺旋巻小径パイプ２が圧縮力を受け、各パイプ
部分2aに圧縮応力が発生して偏平に変形されようとする
が、隣接するパイプ部分2a、2aの外周対向面同士が密着
７しているので、互いに反発し合って夫々の変形を防止
することになり、その反発力が該密着部７と上記外管３
に対する密着部６との間の各パイプ部分2aの円弧部分に
両密着部６、７間が圧縮力を受けることになる。The pressure-resistant synthetic resin pipe thus formed is
When used as an electric wire protection pipe, a drain pipe, or another underground buried pipe, and when an external pressure such as earth pressure acts on the outer pipe 3, each pipe of the continuous spiral wound small diameter pipe 2 is attached to the inner peripheral surface of the outer pipe 3. Part 2a
The pressure is distributed to these pipe portions 2a whose outer peripheral surface portions are in close contact 6 integrally. The pressure causes the spiral-wound small-diameter pipe 2 to receive a compressive force, and a compressive stress is generated in each pipe portion 2a so that the pipe portion 2a is deformed into a flat shape. Since they are in close contact with each other, they repel each other to prevent their respective deformations, and the repulsive force is the repulsive force between the close contact portion 7 and the outer tube
The arcuate portion of each pipe portion 2a between the contact portion 6 and the contact portion 6 receives a compressive force between the contact portions 6 and 7.
【００１０】この時、各パイプ部分2aの上記円弧部分
は、隣接するパイプ部分2a、2a間とその部分の外管３の
内周面間で形成されている上記空隙部４に上記圧縮力に
応じて弾性的に膨出変形しようとし、圧縮応力をその円
弧部分によって均一に且つ大きく吸収させることができ
るものである。At this time, the circular arc portion of each pipe portion 2a receives the compressive force in the space 4 formed between the adjacent pipe portions 2a, 2a and the inner peripheral surface of the outer pipe 3 at that portion. Accordingly, the arcuate portion can be elastically bulged and deformed to absorb the compressive stress uniformly and largely.
【００１１】又、小径螺旋巻パイプ２は断面円形である
ために、外圧が作用した時に生じる圧縮応力をその全周
に亘って均一に分散させ、座屈等の部分的な変形を生じ
させることなく耐圧強度が一層増大するものである。こ
のような耐圧合成樹脂管は公知の合成樹脂螺旋管製造装
置によって製造することができる。Further, since the small-diameter spirally wound pipe 2 has a circular cross section, the compressive stress generated when an external pressure is applied is uniformly dispersed over the entire circumference thereof, and partial deformation such as buckling is caused. The pressure resistance is further increased. Such a pressure resistant synthetic resin pipe can be manufactured by a known synthetic resin spiral pipe manufacturing apparatus.
【００１２】即ち、回転成形軸上に一定幅と厚みを有す
るポリエチレン等の半溶融状態の合成樹脂帯状材を、先
に巻回する帯状材部分の一側縁と次に巻回する帯状材部
分の他側縁とが互いに密着一体化するようにして螺旋状
に巻回することにより上記内管１を形成していくと共
に、この内管１上に押出成形等された同一材料よりなる
小径パイプ２を、先に巻回するパイプ部分2aと次に巻回
するパイプ部分2aとの対向側周面が互いに密着するよう
にして密な螺旋状に巻着し、さらに、この螺旋巻小径パ
イプ２上に一定幅と厚みを有するポリエチレン等の半溶
融状態の合成樹脂帯状材を、上記内管１の形成時と同様
にして螺旋状に巻着することにより外管３を形成してい
けばよい。That is, a semi-molten synthetic resin strip having a certain width and thickness on the rotational molding shaft is wound on one side edge of the strip material portion to be wound first and a strip material portion to be wound next. The inner pipe 1 is formed by spirally winding it so that the other side edge and the other side edge are closely integrated with each other, and a small diameter pipe made of the same material extruded on the inner pipe 1 and the like. 2 is wound in a dense spiral shape such that the peripheral surfaces of the first winding pipe portion 2a and the second winding pipe portion 2a are in close contact with each other, and further, the spiral winding small diameter pipe 2 The outer tube 3 may be formed by spirally winding a semi-molten synthetic resin strip having a certain width and thickness, such as polyethylene, in the same manner as when forming the inner tube 1. .
【００１３】なお、パイプ２の形成材料としては、必ず
しも内外管１、３と同一材料とする必要はなく、ポリエ
チレン以外の硬質合成樹脂材を使用してもよい。 The material for forming the pipe 2 must be
It is not necessary to use the same material as the inner and outer pipes 1 and 3,
A hard synthetic resin material other than ethylene may be used.
【００１４】[0014]
【発明の効果】以上のように本発明の耐圧管によれば、
合成樹脂製内管１の外周面に硬質合成樹脂よりなる断面
中空円形のパイプ２を隣接するパイプ部分２ａ、２ａの
外周対向面同士が互いに密接した状態となるように連続
螺旋状に巻回、固着して中空補強体を形成してあり、こ
の中空補強体の外周面に合成樹脂製外管３を被嵌状態に
固着してなるものであるから、外管３に土圧等の外圧が
作用した場合には、この外管３の内周面に一体的に密着
している連続螺旋巻パイプ２に外圧を分散させて一部の
パイプ部分２ａに圧縮力が集中するのを防止することが
できる。As described above, according to the pressure resistant tube of the present invention,
A pipe 2 having a hollow circular cross section made of hard synthetic resin is wound around the outer peripheral surface of the synthetic resin inner tube 1 in a continuous spiral shape so that the outer peripheral facing surfaces of adjacent pipe portions 2a, 2a are in close contact with each other, It adheres to form a hollow reinforcement,
The outer tube 3 made of synthetic resin is fitted on the outer peripheral surface of the hollow reinforcing body
Since they are fixed , when external pressure such as earth pressure acts on the outer pipe 3, the external pressure is dispersed in the continuous spirally wound pipe 2 that is integrally adhered to the inner peripheral surface of the outer pipe 3. By doing so, it is possible to prevent the compressive force from being concentrated on a part of the pipe portion 2a.
【００１５】従って、部分的な圧縮変形を防止すること
ができると共に、この圧力によって該螺旋巻パイプ２が
圧縮しようとするが、隣接するパイプ部分2a、2aの外周
対向面同士が密接しているので、互いに反発し合って夫
々の変形を強固に阻止し、その反発力によってパイプ２
を含む管全体の変形を防止すると共に大きな耐圧強度を
発揮することがてきるものである。又、螺旋巻パイプ２
は断面円形であるために、外圧が作用した時に生じる圧
縮応力をその全周に亘って均一に分散させ、座屈等の部
分的な変形を生じさせることなく耐圧強度が一層増大す
るものである。Therefore, partial compression deformation can be prevented, and the spiral wound pipe 2 tends to be compressed by this pressure, but the outer peripheral facing surfaces of the adjacent pipe portions 2a, 2a are in close contact with each other. Therefore, they repel each other and firmly prevent each deformation, and the repulsive force causes the pipe 2
It is possible to prevent the deformation of the entire tube including, and to exert a large pressure resistance. Also, spirally wound pipe 2
Has a circular cross section, the compressive stress generated when an external pressure is applied is uniformly distributed over the entire circumference, and the compressive strength is further increased without causing partial deformation such as buckling. .
【図１】一部切欠縦断側面図、FIG. 1 is a partially cutaway vertical side view,
【図２】外圧を受けた時の作用を説明するための断面
図、FIG. 2 is a cross-sectional view for explaining the action when an external pressure is applied,
【図３】従来の耐圧合成樹脂管の一部を断面した簡略側
面図、FIG. 3 is a simplified side view in which a part of a conventional pressure-resistant synthetic resin pipe is sectioned,
【図４】その変形状態を示す断面図。FIG. 4 is a sectional view showing the deformed state.
１ 合成樹脂製内管 ２ 連続螺旋巻中空円形パイプ 2a パイプ部分 ３ 合成樹脂製外管 1 Synthetic resin inner tube 2 Continuous spirally wound hollow circular pipe 2a Pipe part 3 Synthetic resin outer tube
Claims (1)
脂よりなる断面中空円形のパイブ２を隣接するパイプ部
分２ａ、２ａの外周対向面同士が互いに密接した状態と
なるように連続螺旋状に巻回、固着して中空補強体を形
成してあり、この中空補強体の外周面に合成樹脂製外管
３を被嵌状態に固着してなる耐圧合成樹脂管。1. A hard synthetic resin is formed on the outer peripheral surface of a synthetic resin inner tube 1.
Pipe section 2a adjacent the sectional hollow circular Paibu 2 from fat ing, a state where the outer circumferential face surfaces of 2a closely to each other
So as to continuously helically winding, form a hollow reinforcing body fixed
A pressure-resistant synthetic resin pipe formed by fixing a synthetic resin outer pipe 3 to the outer peripheral surface of the hollow reinforcing member in a fitted state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5346150A JP2547178B2 (en) | 1993-12-21 | 1993-12-21 | Pressure resistant synthetic resin pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5346150A JP2547178B2 (en) | 1993-12-21 | 1993-12-21 | Pressure resistant synthetic resin pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06201078A JPH06201078A (en) | 1994-07-19 |
| JP2547178B2 true JP2547178B2 (en) | 1996-10-23 |
Family
ID=18381457
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5346150A Expired - Fee Related JP2547178B2 (en) | 1993-12-21 | 1993-12-21 | Pressure resistant synthetic resin pipe |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2547178B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4832251B2 (en) * | 2006-10-26 | 2011-12-07 | エバック株式会社 | Manufacturing method of synthetic resin hose |
| KR100948975B1 (en) * | 2009-12-28 | 2010-03-23 | 주식회사 대흥종합엔지니어링건축사사무소 | Protective pipe for underground cable |
| JP2022079214A (en) * | 2020-11-16 | 2022-05-26 | 和幸 前田 | Heat insulation device and heat insulation metho of pipe and container |
| JP7133250B1 (en) * | 2021-12-07 | 2022-09-08 | 和幸 前田 | Insulation device and insulation method for pipes and containers |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS447710Y1 (en) * | 1965-08-24 | 1969-03-25 | ||
| JPS4723694U (en) * | 1971-04-07 | 1972-11-16 | ||
| JPH01144585U (en) * | 1988-03-30 | 1989-10-04 |
-
1993
- 1993-12-21 JP JP5346150A patent/JP2547178B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06201078A (en) | 1994-07-19 |
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