Inspection line for underground pipe, has bottom unit with base wall limited by inner and outer sides of which outer side is inclined relative to inner side along non zero angle, and joint arranged between stackable units

摘要

The line has a blind tubular bottom unit (1) with a base wall (3), limited by inner and outer sides (3a, 3b), closing a base of the unit (1) and having a rectilinear cunette (4) in its thickness. The wall (3) connects connection passages (2a, 2b) drilled in a periphery wall. The side (3a) is parallel to an upper opening side (1a) of the unit (1). The side (3b) is inclined with respect to the side (3a) along a non zero angle (A). An annular joint (15) is arranged between stackable units constituted of a head collar (12), a tubular head unit (6), a collar unit (8) and the unit (1). An independent claim is also included for a bottom unit manufacturing method.