| 摘要 |
<p>The invention provides that a layer (40) of hardened material is created on the surface of an underground passageway, in particular a sewer (22) so as to restore its utility and the method used is to place a first lining tube (24) in the sewer along its length, and then to evert a second tube (34), of smaller diameter, along the sewer (22) into the first tube. The novelty of the invention is to insert into the first tube (24) a fluent mass (32) against which the second tube (34) is everted and the fluent mass comprises a hardenable material, typically a synthetic resin and a solid particulate material (10), typically even diameter beads, which serves to limit the thickness to which the mass (32) can be compressed between the tubes (24, 34) whereby an even thickness layer of the fluent mass (32) lying circumferentially of the sewer (22) forms between the tubes, and this layer is held and is hardened either by forcing or by natural means.</p> |
