| 摘要 |
A method for internally lining ducts and sleeves for ducts lined in accordance with this method are provided. The inner lining sleeve is formed in the duct by the action of a uniform pressure on the inner face of a second sleeve in a form of a sheet made from a sealed synthetic material whose outer face is provided with fibers. This pressure acts so as to enlarge the section of this sleeve by plastic deformation of said sheet and to apply the sleeve against the inner face of a first sleeve made from a composite material permeable over the whole of its thickness and coated with a heat hardenable resin. The section of said first sleeve enlarges without the composite material undergoing elastic or plastic deformation. The two joined sleeves continue to enlarge their sections until the outer face of the first sleeve is applied firmly against the inner face of an envelope in the form of a sheet of sealed synthetic material. The pressure continues to act at a controllable temperature and applies the sleeve and envelope assembly against the inner face of the duct. After hardening of the resin, the pressure is removed. The second sleeve adheres by its fibers to the first sleeve. The second sleeve may advantageously be used as inflatable balloon for application of the pressure. Heating means and means for controlling the polymerization temperature may be provided. |
