REPAIR TRENCH ALONG MAIN PIPELINE AND METHOD TO ARRANGE FOR REPAIR TRENCH ALONG MAIN PIPELINE Russian patent published in 2014 - IPC F16L1/28 

FIELD: machine building.

SUBSTANCE: repair trench comprises slopes with specified inclination on both sides of a main pipeline, the pipeline is laid in the ground with minimal ground wall thickness of at least 200-300 mm, and a flat bottom is provided on both sides of the pipeline laid in the ground for the width of an excavator bucket. The ground excavated from the trench is distanced from the trench slope edges by at least 500 mm on both sides of the trench. Method to arrange for the repair trench along the main pipeline implies that the repair trench is provided as a ditch, the top soil is removed first, the right-of-way is cleared from bushes and vegetation, the ditch axis is set out and tied afield, it is made by butt end face method at single-bucket excavator movement along the axis of newly laid oil pipeline instead of the one to be repaired. The ground excavated from the ditch is laid in piles not closer than 0.5-0.7 m from the ditch edge. At making a ditch by a single-bucket excavator, range poles are installed along the ditch axis ahead of the excavator and behind it along the ditch already made, reference marks 1-3 m high are set at straight sections in the direction of its movement every 30-50 m. Reference marks are set every 1-2 m within the curve line across the width of crawler track travelling or across the ditch width in order to improve accuracy of the excavator movement at curvilinear section in respect to the ditch.

EFFECT: simplified works performance by maximal decrease of manual labour at minimal environmental impact.

3 cl, 1 dwg