Concrete sanitary sewer pipes and manholes featuring a protective plastic liner

(11) EP 3 995 638 A1

(22) 04.11.2021

(43) 11.05.2022

(57) A prefabricated composite concrete element for use in a corrosive sewer environment. The concrete element has a hollow reinforced cast concrete portion with at least one end having connection details, a premolded corrosion resistant inner plastic liner. The plastic linerlines an interior of the hollow concrete element and the connection details to provide abutting liner faces in an assembled joint to limit exposure through said joint of said concrete portion to corrosive materials arising in said sewer environment. At least two prefabricated composite concrete elements may be assembled end to end at a joint to form a concrete sewer system. Also disclosed are a method of prefabricating such a composite concrete element.

(71) Munro, John King City, Ontario L7B 1K1 (CA)

(84) Designated Contracting States: AL, AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HR, HU, IE, IS, IT, LI, LT, LU, LV, MC, MK, MT, NL, NO, PL, PT, RO, RS, SE, SI, SK, SM, TR, Designated Extension States: BA, ME, Designated Validation States: KH, MA, MD, TN