METHOD FOR TRENCHLESS REPAIR OF SEWAGE NETWORKS Russian patent published in 2011 - IPC E03F3/06 

FIELD: construction.

SUBSTANCE: at least one start pit is dug for the length that exceeds length of repair pipe section, upper section of worn pipeline is opened for a value of width that is not less than diameter of repair pipe section. The first section of repair pipe with diameter less than diameter of worn pipeline is introduced into opened section with a radial slot between inner diameter of worn pipeline and outer diameter of repair pipe section. It is moved inside non-opened section of worn pipeline with simultaneous control and monitoring of movement travel. After movement of the first section of repair pipe, it is aligned with each subsequent section along horizontal line, vertical line, and is connected to the previous section. Gap is plugged between inner diameter of worn pipe and outer diameter of repair pipe after insertion, connection and movement of the last section of repair pipe. All repair operations are carried out without isolation of travelling flows. After opening of worn pipeline, at least two rollers extended along length of repair pipe are installed on its bottom parallel to axis of pipeline.

EFFECT: method provides for possibility to do repair works without isolation of flows, which makes it possible to reduce labour intensiveness of the process.

2 cl, 4 dwg