发明名称 |
Method of installing a new pipe inside an existing conduit by progressive rounding |
摘要 |
A thin, flexible tubular membrane provides a heat containment tube for inserting into and inflation within an underground conduit to be repaired. Folded rigid thermoplastic pipe is inserted into the tube while hot and flexible. The tubular membrane is pressurized to exclude unwanted fluids from within the existing conduit. Hot steam is injected into the tube to heat the pipe full-length externally and internally until flexible. The pipe is then rounded and expanded against the walls of the conduit with the tube therebetween. The rounding and expanding of the pipe is carried out progressively by moving a plug through the pipe and by injecting hot steam under pressure behind the plug.
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申请公布号 |
US5244624(A) |
申请公布日期 |
1993.09.14 |
申请号 |
US19910734374 |
申请日期 |
1991.07.22 |
申请人 |
NUPIPE, INC. |
发明人 |
STEKETEE, JR., CAMPBELL H. |
分类号 |
B26D3/16;B29C47/90;B29C49/26;B29C53/08;B29C53/10;B29C61/02;B29C61/06;B29C63/00;B29C63/34;B29C67/00;E03F3/06;F16L55/165;F16L55/179 |
主分类号 |
B26D3/16 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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