Keywords:
Circular, Compressive strength, Concrete composition, Concrete cover, Concretes, Conformity, Conformity assessment, Design, Dimensions, Evaluations, Finishes, Foreign surveillance, Inspection, Land drainage works, Manholes, Marking, Materials, Nominal widths, Peak value of compression strength, Peak value of pressure force, Precast concrete parts, Prefabricated parts, Product specification, Production control, Quality assurance, Quality control, Reinforced concrete, Reinforcement, Resistance, Ring of tubbings, Sewage, Sewage engineering, Sewers, Shaft sinking, Shafts, Sleeve joints, Sleeves, Specification (approval), Stacks, Steel fibre concretes, Strips, Surveillance (approval), Taper shaft ring, Testing, Tolerances (measurement), Types, Underground, Vertex load, Water pipelines, Water practice, Watertightness