Lining tube for restoring defective sewer shafts including a berm and a channel, and method for producing same, and method for lining a defective sewer shaft

A lining tube for restoring a defective sewer shaft, wherein the sewer shaft has a first shaft portion with a first diameter and an adjacent second shaft portion with an expanded diameter and a berm and a channel, the lining tube comprising:

• an inner film tube;
• a tubular layer of fiber material arranged around said inner film tube and configured to be radially expanded, said fiber material being impregnated with a curable reaction resin;
• said inner film tube having a connection portion which extends in a longitudinal direction thereof, and which connects two circumferential portions, of said inner film tube that extend parallel with each other, to form a circumferentially closed inner film tube having a defined nominal diameter;
• said connection portion having a desired breaking location which extends along the inner film tube and which is configured to be separated by introducing a pressurized medium into said inner film tube in a circumferential direction in order to radially expand said inner film tube and said layer of fiber material over the nominal diameter;
• said radially expandable tubular layer of fiber material being closed at a first end which can be introduced into the channel of the sewer shaft by a seam that extends orthogonally with respect to the longitudinal axis of the tubular layer of fiber material.