DEVICE FOR TRENCHLESS REPLACEMENT OF PIPELINE Russian patent published in 2009 - IPC F16L1/28 

FIELD: construction.

SUBSTANCE: in device for trenchless replacement of pipelines, comprising pipe-breaking working element with disk knife, expander for increase of well diametre and traction element, in pipe-breaking working element opposite to disk knife there is an additional disk knife installed, behind pipe-breaking working element there is an additional pipe-breaking working element installed and hingedly joined, with two disk knives arranged opposite to each other, all four disk knives are installed in single plane of cross section, besides disk knives of pipe-breaking working element protrude beyond border of internal surface of damaged pipeline by value that is less than thickness of its wall, and disk knives of additional pipe-breaking working element protrude beyond border of internal surface of damaged pipeline by value that is more than thickness of its wall, behind additional pipe-breaking working element the following components are serially installed and hingedly joined - expander for increase of well diametre and additional expander for increase of well diametre, made of spherical shape, at the same time diametre of expander for increase of well diametre is equal to 1.1-1.3 of damaged pipeline diametre, and diametre of additional expander for increase of well diametre is equal to 1.3-1.5 diametre of damaged pipeline, traction element is made in the form of rope with elements arranged on it, in which three equidistant balls are placed with the possibility of rotation in all directions, elements are separated from each other by means of washers, which are made of elastic material.

EFFECT: provision of possibility of trenchless replacement of curvilinear pipelines.

8 dwg