METHOD TO INSTALL UNDERGROUND PIPELINE WHEN CROSSING ACTIVE SEISMOTECTONIC AREA Russian patent published in 2014 - IPC F16L1/28 

FIELD: machine building.

SUBSTANCE: first borders of the seismotectonic area are defined, and a trench is dug with gentle slopes, the axis of which in plan corresponds to the axis of the pipeline. Then a water-impermeable shell is laid onto levelled bottom and slopes of the trench, and the shell is made from elastic material, on top of which they fill a cushion from a sand filler, afterwards a pipeline is laid onto the cushion, the trench is filled with the sand filler to the height above the pipeline of less than 0.5 of the external diameter of the pipeline. The upper edges of the shell are connected to form a closed shell around the sand filler, and via water-impermeable links that are tightly connected with the pipeline and the shell, they withdraw the pipeline from the sand filler outside the borders of the seismotectonic area. At the same time in the lower part of the sand filler they install a drainage pipe, which is hydraulically communicated with the emergency reservoir, and the pipeline is equipped with a pressure sensor in the pore space of the sand filler and two locking devices, which are arranged on the pipeline, one beyond each border of the seismoactive area. Between the borders of the seismotectonic area the pipeline from outside may be equipped with a layer of specified thickness from foamed material with tightly closed pores.

EFFECT: increased operational reliability of a pipeline, efficient collection of information on leakage of a product from a pipeline within a seismotectonic area and prevention of product spread in adjacent soil areas.

8 cl, 3 dwg