Underground tube for gas, water, sewage, supply lines, etc. has longitudinal chambers defined by radial walls for different services, and inner tube

摘要

The tube has a jacket (3) and internal longitudinal chambers (8-8.4). These are separated by radial walls (7). The tube also contains an inner tube (9), and this is supported by the internal walls. Inspection openings are located in the tube jackets, with each chamber having its own inspection opening.