METHOD OF FORMATION OF MOLE DRAINS Russian patent published in 2017 - IPC E02B11/02 

FIELD: construction.

SUBSTANCE: method of formation of mole drains involves cutting in the soil thickness 1 along the drainage route of W-shaped slot 2, enclosing the drain 3 along the sides and from bottom, forming drain cavities 3 with compaction of its walls with the vertical center part of the slot 2 goes to the drain 3 from below. The drain cavity 3 in cross section is formed as Reuleaux triangle, where one of the corners of Reuleaux triangle is located in the upper part of the dome part 4 of the drain cavity 3.

EFFECT: increased stability of the dome and walls of mole drains.