Concrete sanitary sewer pipes and manholes featuring a protective plastic liner
OwnerJohn Munroinventor
Life of this patent
Estimating the term…
Abstract
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 liner lines 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.
Claims15
A prefabricated composite concrete element for use in a corrosive sewer environment, said concrete element comprising:
- a hollow reinforced cast concrete portion with at least one end having connection details;
- and
- a premolded corrosion resistant inner plastic liner;
- wherein said plastic liner lines an interior of said hollow concrete element and said 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.
A concrete sewer system comprising at least two prefabricated composite concrete elements assembled end to end at a joint, each of said at least two prefabricated composite concrete elements comprising:
- an outer reinforced cast concrete portion;
- a connection detail at one or both ends of said composite concrete element;
- and
- a continuous inner plastic liner defining a corrosion resistant throughbore for transporting wastewater;
- wherein each said continuous plastic liner lines an interior of said outer reinforced cast concrete portion and conforms to said connection details to permit said assembled concrete elements to form a liner to liner contact face in said joint;
- and
- wherein said liner to liner contact face permits said joint to be sealed to contain corrosive elements within said throughbore.
A method of prefabricating a composite concrete element for a wastewater system, said method comprising the steps of:
- positioning an outer mold element to define an outer concrete surface of said composite concrete element;
- positioning a preformed inner plastic liner to define an interior surface of said composite concrete element, said preformed inner plastic liner at least partially further defining end connection details of said composite concrete element, and creating a casting void between said outer mold element and said preformed inner plastic liner;
- providing at least one inner mold element to support said preformed inner plastic liner in position during concrete casting;
- filling said casting void with concrete and allowing said concrete to set to form a cast composite concrete element;
- removing said at least one inner mold element, and then removing said cast composite concrete element from said outer mold element;
- and
- curing said cast composite concrete element to form said cured composite concrete element.
Dependencies are inferred from the claim text.