| 摘要 |
<p>Masonry or concrete structures such as viaducts or railway bridges having a masonry or concrete trench (1) at least partly filled with a layer of compacted, ungraded, heterogeneous particulate material (2) supporting a ballast layer (3) on which railway tracks (4) are laid are protected from runoff water as follows: a) without moving the ballast particles (3), an aqueous suspension of a powdered mineral material (6) or an aqueous solution of an organic material which can be polymerized to a gel (6') is spread over the top surface (5) of the layer (2) in a sufficient quantity to render the surface (5) uniform; b) after disengagement of the walls (7) of the trench (1), the inner face (8) is impregnated with a liquid composition (9) at least part of which is converted at ambient temperature to an impermeable solid or elastoplastic mass; and c) after solidification of the layer of mineral matter (6) or gelling of the organic material (6'), a liquid composition (9) as defined above is spread over the surface of the organic material (6') without moving the ballast particles (3).</p> |
