METHOD TO DISMANTLE SMOKE STACK Russian patent published in 2013 - IPC E04G23/08 E04H12/28 

FIELD: construction.

SUBSTANCE: method to dismantle a smoke stack consists in the fact that in a bearing shaft of a smoke stack through niches are punched, and the dismantled stack is rested on wooden bars arranged in niches, afterwards partitions between niches are removed with simultaneous burning of wooden bars. In the sector of pipe parts falling they dig at least two trenches arranged at the angle from 30 to 90 degrees to the bisector of the pipe falling sector, and between trenches they lay soil or another shock-absorbing material, and the smoke stack itself is separated at least into two separate parts, and at the side of the direction of falling dismantled parts of the smoke stack, in the section of parts separation, they punch through niches with height of not less than half of the radius of the pipe section and length of not less than half of the perimetre of the section, and dismantled parts of the pipe in the place of niches punching are rested against wooden bars, bars are laid horizontally, and the dismantled parts of the smoke stack subject to simultaneous cutting are inclined in the direction of falling by the angle of at least one degree, relative to the vertical axis of the lower part of the pipe, and at the side of falling direction the pipe parts are left connected between each other with metal elements or ropes, and at the side opposite to the falling direction, in the section of separation of parts of the smoke stack, reinforcement and other binding elements are cut fully from one third to three fourths of the separating section perimetre.

EFFECT: increased safety of smoke stacks dismantling, reduced seismic load, increased accuracy of falling of dismantled parts of a pipe, reduced cost and timing of dismantling.