Drain and inspection manhole for liquid conduits and manhole section for such drain and inspection manhole

摘要

The present invention relates to a drain and inspection manhole (32) for liquid conduits, in particular waste water and/or storm water drains, comprising a manhole section (11), having a central longitudinal axis (5). The manhole section (11) is formed as a composite pipe (1) having a smooth cylindrical internal pipe (2) and a corrugated external pipe (3), with at least one aperture (13) in the external pipe (3) and an aperture (14), flush therewith, in the internal pipe (2). The manhole section (11) is provided with a connector (17) which is disposed in the aligning apertures (13, 14) and joined to the composite pipe (1) and which has a central axis (10). The external pipe (3) is deformed to comprise at least one connecting base (7, 7', 7") with a marginal web (8) that is concentric to the central axis (10) and encircles the aperture (13) in the external pipe (3) and which accommodates the connector (17). Said connecting base (7, 7', 7") of the manhole section (11) includes a plate (9) which is formed in a single piece with the marginal web (8) and into which the opening (13) in the external pipe (3) is cut.