METHOD FOR BURIAL OF PIPELINE TO DESIGN LEVELS Russian patent published in 2014 - IPC F16L1/28 

FIELD: machine building.

SUBSTANCE: method involves uncovering of a pipeline on one side of a trench below design depth so that a groove is created. Then, the pipeline is buried to design levels under action of gravity force and movement of grounds (sand clay, sand) to the groove side. In order to provide the pipeline burial to the required value, gravity depth h_g is determined by the following formula: where h_bur - pipeline burial depth before works are performed, m; h_reg - required pipeline burial depth to the pipe top, m; k - safety margin accepted for loose grounds k=1.2 and for binder grounds k=1.25; a - width of ground section under the pipeline that is offset after the trench development to the gravity side, which is equal to outside diameter D_o of the pipeline, m; b - width of the trench at the bottom, m. In case of dense binder grounds, the ground is extracted from under the pipeline with an excavator.

EFFECT: reduction of costs and labour intensity owing to reducing the number of working operations and working personnel.

2 cl, 4 dwg