JPH0617071B2 - Hard tube lining method for inner surface of pipe - Google Patents
Hard tube lining method for inner surface of pipeInfo
- Publication number
- JPH0617071B2 JPH0617071B2 JP63081090A JP8109088A JPH0617071B2 JP H0617071 B2 JPH0617071 B2 JP H0617071B2 JP 63081090 A JP63081090 A JP 63081090A JP 8109088 A JP8109088 A JP 8109088A JP H0617071 B2 JPH0617071 B2 JP H0617071B2
- Authority
- JP
- Japan
- Prior art keywords
- tube
- hard tube
- steam
- hard
- lining method
- 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
- Lining Or Joining Of Plastics Or The Like (AREA)
- Pipe Accessories (AREA)
Description
【発明の詳細な説明】 産業上の利用分野 本発明は管内面の硬質チューブライニング工法に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hard tube lining method for an inner surface of a tube.
従来の技術とその問題点 従来管内面のチューブライニング工法として管内挿入の
硬質チューブを内部から加熱，加圧して膨脹し、管内面
に内張りするような硬質チューブライニング工法が提案
されている。2. Description of the Related Art As a conventional tube lining method for the inner surface of a pipe, a hard tube lining method has been proposed in which a hard tube inserted into the tube is heated and pressurized to expand from the inside and is lined on the inner surface of the tube.
この種ライニング工法に於て、硬質チューブを加熱空気
を用いて加熱加圧し膨脹して管内面に内張する試みがな
されているが、加熱空気では熱容量が小さいために、硬
質チューブを全長に亘り均一加熱して軟化させるに必要
な熱量を確保することが困難となり、実際問題として実
施できない。In this type of lining method, it has been attempted to heat and pressurize the hard tube with heated air to expand it and line it inside the tube.However, since the heat capacity of heated air is small, the hard tube is stretched over the entire length. It becomes difficult to secure the amount of heat necessary for uniform heating and softening, which cannot be practically performed.
この場合加熱空気に代えスチームを用いるようにすれば
スチームは熱容量が大きにので、硬質チューブの加熱軟
化に必要な熱量は充分に確保できるが、次の点で問題が
あることが判明した。In this case, since steam has a large heat capacity when steam is used instead of the heated air, the heat quantity necessary for heating and softening the hard tube can be sufficiently secured, but it has been found that there is a problem in the following point.
上記ライニング工法に於て、硬質チューブとしては、通
常塩化ビニル樹脂，ポリエチレン，ポリプロピレン等の
ような汎用の合成樹脂製のものが用いられる。硬質チュ
ーブは管の口径の略々５０〜７０％程度に相当する外径
を持ち、管内での加熱，加圧膨脹に際しては、１．０〜
１．５kg／cm2（ゲージ圧）程度の膨脹圧力を要するこ
とが実験的に確認されている。ところが上記膨脹圧力に
平衡するスチームの飽和温度は、１２０〜１３０℃にも
達し、このような高温度の雰囲気のもとに硬質チューブ
を加熱軟化すると、軟化が進みすぎるために、硬質チュ
ーブの伸び率が低下する。例えばこの種用途に用いられ
ている通常の塩化ビニル樹脂製硬質チューブに於て、伸
び率は軟化点（８０℃前後）を超えるに従い増大し、９
０〜１０５℃程度で最大（例えば２５０〜３００％程
度）となり、これより高温になると、次第に低下して行
く。従って１２０〜１３０℃もの高温領域で加熱軟化さ
れた硬質チューブは、伸び率の低い領域で加圧膨脹を受
けることになるので、膨脹時に破裂する危険性を生じ、
特にこの傾向は大きな膨脹率を必要とする場合に顕著と
なる。In the lining method, the rigid tube is usually made of a general-purpose synthetic resin such as vinyl chloride resin, polyethylene or polypropylene. The rigid tube has an outer diameter corresponding to about 50 to 70% of the diameter of the tube, and 1.0 to
It has been experimentally confirmed that an expansion pressure of about 1.5 kg / cm 2 (gauge pressure) is required. However, the saturation temperature of steam equilibrating with the expansion pressure reaches 120 to 130 ° C., and if the hard tube is heated and softened under such a high temperature atmosphere, the soft tube is excessively softened, so that the elongation of the hard tube is increased. The rate drops. For example, in a normal vinyl chloride resin hard tube used for this kind of application, the elongation increases as the softening point (around 80 ° C) is exceeded,
It becomes maximum (for example, about 250 to 300%) at about 0 to 105 ° C., and gradually decreases at higher temperatures. Therefore, a hard tube that has been softened by heating in a high temperature range of 120 to 130 ° C. is subject to pressure expansion in a low elongation region, and thus there is a risk of bursting during expansion,
In particular, this tendency becomes remarkable when a large expansion rate is required.
本発明はこのような従来の問題点を一掃することを目的
としてなされたものである。The present invention has been made for the purpose of eliminating such conventional problems.
問題点を解決するための手段 本発明は、管内挿入の硬質チューブを内部から加熱，加
圧して膨脹し管内面に内張する硬質チューブライニング
工法に於て硬質チューブの内部加熱をスチームにより、
常圧又はチューブ膨脹を伴なわないような比較的低い加
圧状態のもとに行ないまた内部加圧を、上記スチームの
供給を継続したままで上記チューブ内に供給される加圧
空気により行ない、上記加圧空気のチューブ内供給は、
チューブ内の全長に亘り挿入された多孔ホースを通じて
行なうことを特徴とする管内面の硬質チューブライニン
グ工法に係る。Means for Solving the Problems The present invention is to heat a hard tube inserted in a pipe from the inside, to expand by heating and pressurize and to line the inner surface of the pipe.
Performing under normal pressure or a relatively low pressure state that does not accompany tube expansion, and internal pressurization is performed by pressurized air supplied into the tube while continuing the supply of the steam, The above-mentioned supply of pressurized air into the tube is
The present invention relates to a hard tube lining method for an inner surface of a tube, which is performed through a perforated hose inserted over the entire length of the tube.
実施例 以下に本発明の一実施例を添付図面にもとづき説明する
と次の通りである。Embodiment An embodiment of the present invention will be described below with reference to the accompanying drawings.
第１図は管内挿入の硬質チューブ（１）の加熱工程の状
況を、また第２図は加圧膨脹工程の状況を、それぞれ示
している。硬質チューブ（１）としては、常法通り塩化
ビニル樹脂，ポリエチレン，ポリプロピレンなどのよう
な軟化点８０℃付近の汎用の合成樹脂、例えば塩化ビニ
ル樹脂製のものが使用される。硬質チューブ（１）は管
（ａ）の口径（内径）の略々５０〜７０％に相当する外
径を持ち、断面円形又はこれより偏平加工された状態
で、管（ａ）の全長に亘って挿入されている。上記チュ
ーブ（１）内には、全長に亘り先端閉塞の多孔ホース
（２）が、予め或は管（ａ）内挿入後に挿入され、該ホ
ース（２）の基端側は予熱装置（１２）及び流量調整弁
（３）を備えた導管（４）を介して加圧空気供給源例え
ばコンプレッサ（図示せず）に接続されている。硬質チ
ューブ（１）の両端は、栓（５ａ），（５ｂ）により閉
塞され、該チューブ（１）内は一端側に於て、栓（５
ａ）に形成した供給孔（６）及びこれに接続する流量調
整弁（７）付導管（８）を介してスチーム供給源例えば
ボイラ（図示せず）に連絡され、また他端側に於て、栓
（５ｂ）に形成した排気孔（９）及びこれに接続する流
量調整弁（１０）付排気管（１１）を介して外部に開口
されている。FIG. 1 shows the situation of the heating process of the rigid tube (1) inserted into the pipe, and FIG. 2 shows the situation of the pressure expansion process. As the hard tube (1), a general-purpose synthetic resin such as vinyl chloride resin, polyethylene, polypropylene having a softening point of about 80 ° C., for example, a vinyl chloride resin, is used as usual. The rigid tube (1) has an outer diameter corresponding to approximately 50 to 70% of the bore (inner diameter) of the tube (a), and has a circular cross section or a flattened shape, and extends over the entire length of the tube (a). Has been inserted. A porous hose (2) having a closed tip over the entire length is inserted into the tube (1) in advance or after being inserted into the tube (a), and the base end side of the hose (2) is a preheating device (12). And a conduit (4) equipped with a flow regulating valve (3) to a source of pressurized air, for example a compressor (not shown). Both ends of the rigid tube (1) are closed by plugs (5a) and (5b), and the inside of the tube (1) is closed at one end with the plug (5).
It is connected to a steam supply source such as a boiler (not shown) through a supply hole (6) formed in a) and a conduit (8) with a flow rate adjusting valve (7) connected thereto, and at the other end side. , Through the exhaust hole (9) formed in the plug (5b) and the exhaust pipe (11) with the flow rate adjusting valve (10) connected to the exhaust hole (9).
第１図に示す状態でスチームをボイラ（図示せず）から
導管（８）及びこれに接続する供給孔（６）を通じて硬
質チューブ（１）内に、流量調整弁（７）及び（１０）
の開度調整によりチューブ（１）内圧力が０〜０．３kg
／cm2（ゲージ圧）程度の低圧力に保持されるように供
給すると、チューブ（１）内のスチームの飽和温度は１
００〜１０５℃程度となり、よって硬質チューブ（１）
は１００〜１０５℃程度のスチームにより加熱される。
このスチーム加熱は、硬質チューブ（１）の外表面の温
度が加熱膨脹に最適の加熱軟化状態が得られるような温
度例えば９０〜１０５℃程度の温度になるまで継続され
る。尚硬質チューブ（１）の外表面の温度は内表面の温
度より、どうしても僅かに低くなるので、スチームの飽
和温度は希望する外表面温度より多少高くとも特に支障
はない。In the state shown in FIG. 1, steam is fed from a boiler (not shown) into the rigid tube (1) through the conduit (8) and the supply hole (6) connected thereto, and the flow rate adjusting valves (7) and (10).
The pressure inside the tube (1) is 0-0.3kg by adjusting the opening of
When it is supplied so that it is maintained at a low pressure of about 1 / cm 2 (gauge pressure), the saturation temperature of steam in the tube (1) is 1
Hard tube (1)
Is heated by steam at about 100 to 105 ° C.
This steam heating is continued until the temperature of the outer surface of the hard tube (1) reaches a temperature at which a heat-softened state optimal for heat expansion is obtained, for example, a temperature of about 90 to 105 ° C. Since the temperature of the outer surface of the hard tube (1) is inevitably lower than the temperature of the inner surface, there is no particular problem even if the saturation temperature of steam is slightly higher than the desired outer surface temperature.
スチーム加熱により硬質チューブ（１）の外表面の温度
が９０〜１０５℃程度の温度となり、最大の伸び率が得
られるような最適の軟化状態に至った時は、スチームに
よる加熱を継続した状態のままで、加圧空気をコンプレ
ッサ（図示せず）から導管（４）及び多孔ホース（２）
を通じて硬質チューブ（１）内に、流量調整弁（３）の
制御によりチューブ（１）内圧力が、加圧膨脹に必要な
圧力例えば１．０〜１．５kg／cm2（ゲージ圧）に昇圧
されるように供給する。When the temperature of the outer surface of the hard tube (1) reaches a temperature of about 90 to 105 ° C. due to steam heating, and when the optimum softening state that the maximum elongation rate is obtained is reached, the heating with steam is continued. In addition, the compressed air is supplied from the compressor (not shown) to the conduit (4) and the perforated hose (2).
The pressure inside the tube (1) is increased to a pressure necessary for pressurization and expansion, for example, 1.0 to 1.5 kg / cm 2 (gauge pressure) by controlling the flow rate adjusting valve (3) into the hard tube (1) through Supply as done.
上記加圧空気の供給を、例えば硬質チューブ（１）の一
端側から行なうと、チューブ（１）内におけるスチーム
の分布状態が供給側が希薄、非供給側が濃厚となるな
ど、一時的にアンバランスとなり、従ってチューブ
（１）内の温度分布も供給側が低く、非供給側が高くな
るなど温度むらを発生し、硬質チューブ（１）の内外表
面の温度は、均一性を欠くことになる。When the pressurized air is supplied from, for example, one end of the hard tube (1), the distribution state of steam in the tube (1) becomes temporarily unbalanced such that the supply side becomes lean and the non-supply side becomes rich. Therefore, the temperature distribution inside the tube (1) also becomes low on the supply side and becomes high on the non-supply side, causing temperature unevenness, and the temperatures of the inner and outer surfaces of the hard tube (1) lack uniformity.
本発明に於ては、加圧空気は多孔性ホース（２）を通じ
て硬質チューブ（１）内に各部均一に分配供給されるの
で、このような加圧空気の供給に拘らずチューブ（１）
内におけるスチームの分布状態は各部均一となり、従っ
て硬質チューブ（１）内の温度分布ひいてはチューブ
（１）の内外表面温度は各部均一に保持され、しかも加
圧空気の供給の間もスチームの供給は継続されるので、
仮に常温の加圧空気が供給されるような場合であって
も、チューブ（１）の内外表面温度は、僅かに低下傾向
となるものの先の最適温度に実質的に保持される。尚加
圧空気は、予熱器（１２）により例えば８０〜１００℃
程度の温度となるように予熱しつつ硬質チューブ（１）
内に供給するようにしてもよい。In the present invention, the compressed air is uniformly distributed and supplied into the rigid tube (1) through the porous hose (2), so that the tube (1) can be supplied regardless of the supply of the compressed air.
The distribution of steam in each part is uniform, so that the temperature distribution in the hard tube (1) and thus the inner and outer surface temperatures of the tube (1) are kept uniform in each part, and the steam is not supplied during the supply of pressurized air. Will continue,
Even if pressurized air at room temperature is supplied, the inner and outer surface temperatures of the tube (1) tend to be slightly lowered, but are substantially kept at the optimum temperature. The pressurized air is, for example, 80 to 100 ° C by the preheater (12).
Hard tube (1) while preheating so that the temperature becomes moderate
You may make it supply inside.
而して本発明工法によれば、硬質チューブ（１）は外表
面温度が各部均一に保持されかつ最大の伸び率を有する
ような最適の加熱軟化状態のもとに加圧膨脹されるの
で、膨脹むらや破裂の発生がなくなり、第２図に示され
る通り、硬質チューブ（１）を管（ａ）の内面に安定確
実に内張りできる。内張りされた硬質チューブ（１）は
加圧空気を利用して冷却固化される。Thus, according to the method of the present invention, since the hard tube (1) is pressurized and expanded under the optimum heat-softened state in which the outer surface temperature is kept uniform in each part and the maximum elongation is obtained, The occurrence of uneven expansion and rupture is eliminated, and as shown in FIG. 2, the hard tube (1) can be lined stably and reliably on the inner surface of the tube (a). The lined hard tube (1) is cooled and solidified using pressurized air.
尚実施例では硬質チューブ（１）として塩化ビニル樹脂
製のものを用いた場合について説明したが、他の汎用の
合成樹脂製のものを用いた場合であっても同様の結果が
得られる。In the examples, the case where the hard tube (1) made of vinyl chloride resin is used has been described, but similar results can be obtained even when the hard tube (1) made of other general-purpose synthetic resin is used.
効 果 本発明工法によれば、スチーム及び加圧空気の併用によ
り、硬質チューブの加圧膨脹を最適の加熱軟化状態のも
とに行うことが可能となり、チューブ破裂などのトラブ
ル発生の危険性なしに実施できる特徴を有する。Effect According to the method of the present invention, the combined use of steam and pressurized air makes it possible to perform the pressure expansion of the hard tube under the optimum heating and softening condition, and there is no risk of trouble such as tube rupture. It has features that can be implemented in.
第１図は本発明工法の加熱工程の状況を概略的に示す縦
断面図、第２図は同加圧膨脹工程の状況を概略的に示す
縦断面図である。 図に於て、（１）は硬質チューブ、（２）は多孔ホー
ス、（４）は加圧空気の導管、（８）はスチームの導管
である。FIG. 1 is a vertical sectional view schematically showing the state of the heating step of the method of the present invention, and FIG. 2 is a vertical sectional view schematically showing the state of the pressure expansion step. In the figure, (1) is a rigid tube, (2) is a perforated hose, (4) is a pressurized air conduit, and (8) is a steam conduit.
Claims (1)
加圧して膨脹し管内面に内張する硬質チューブライニン
グ工法に於て硬質チューブの内部加熱をスチームによ
り、常圧又はチューブ膨脹を伴なわないような比較的低
い加圧状態のもとに行ないまた内部加圧を、上記スチー
ムの供給を継続したままで上記チューブ内に供給される
加圧空気により行ない、上記加圧空気のチューブ内供給
は、チューブ内の全長に亘り挿入された多孔ホースを通
じて行なうことを特徴とする管内面の硬質チューブライ
ニング工法。1. A rigid tube inserted into the tube is heated from the inside,
In the hard tube lining method of expanding by pressure and lining on the inner surface of the tube, the internal heating of the hard tube is performed by steam under atmospheric pressure or under a relatively low pressure condition without tube expansion. The internal pressurization is performed by the pressurized air supplied into the tube while continuing the supply of the steam, and the pressurized air is supplied into the tube through a porous hose inserted over the entire length of the tube. A hard tube lining method for the inner surface of the pipe, which is characterized in that
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63081090A JPH0617071B2 (en) | 1988-03-31 | 1988-03-31 | Hard tube lining method for inner surface of pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63081090A JPH0617071B2 (en) | 1988-03-31 | 1988-03-31 | Hard tube lining method for inner surface of pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01253425A JPH01253425A (en) | 1989-10-09 |
| JPH0617071B2 true JPH0617071B2 (en) | 1994-03-09 |
Family
ID=13736692
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63081090A Expired - Fee Related JPH0617071B2 (en) | 1988-03-31 | 1988-03-31 | Hard tube lining method for inner surface of pipe |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0617071B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2112094A1 (en) | 2008-04-25 | 2009-10-28 | Caretex A/S | A container liner and a method of discharging a container liner |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5625371B2 (en) * | 1973-05-02 | 1981-06-11 | ||
| JPS5249278A (en) * | 1975-10-17 | 1977-04-20 | Mitsui Petrochemical Ind | Method of covering of inner surface of pipe with thermooplastic resin |
| JPS6189028A (en) * | 1984-10-08 | 1986-05-07 | Mitsubishi Plastics Ind Ltd | How to line metal pipes |
| JPS6242826A (en) * | 1985-08-21 | 1987-02-24 | Mitsubishi Plastics Ind Ltd | Manufacture of composite tube |
-
1988
- 1988-03-31 JP JP63081090A patent/JPH0617071B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01253425A (en) | 1989-10-09 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |