narrower concept anchor bar Concept anti-frost layer Concept bore pile Concept carriageway Concept carriageway marking Concept crushed stone base Concept end anchorage Concept formation Concept geotextile Concept gravel base Concept ground Concept ground anchor Concept grout anchor Concept lining segment Concept mastic asphalt surfacing Concept pavement Concept permafrost soil Concept pipeline Concept pipeline component Concept rail Concept road cap Concept road carpet Concept road subsoil Concept road substructure Concept road superstructure Concept road surface Concept shaft Concept sliding surface Concept tension pile Concept tunnel Concept tunnel lining Concept