METHOD FOR ERECTION OF BRIDGE SUPPORT PILLAR ON PERMAFROST Russian patent published in 2010 - IPC E01D19/00 

FIELD: construction.

SUBSTANCE: method for erection of bridge support pillar on permafrost includes operations of well drilling with diametre smaller than diametre of pillar, heating of well and pillar submersion. The novelty in the proposed invention is the fact that it includes operation of heating drilled well and operation of pillar heating, besides prior to submersion, pillar bottom is matched with well top, so that axes of well and pillar coincide and fixed in such position, afterwards simultaneously pillar heating operation and drilled well heating operation are carried out, and further pillar is submerged into well. Heating of hollow (tubular) pillar is done within its cavity, besides bottom of pillar cavity is matched with top of well cavity. Besides operations of pillar heating and well heating are partially matched with operation of pillar submersion. Time of well heating is identified through the following formula: hour, where δ - thickness of soil layer on the side of well cavity, equal to difference of pillar and well radiuses, m; Q - hidden heats for changeover of soil from one phased condition into another one, ccal/m³; t - air temperature in well cavity in process of its heating, degrees. Besides it contains operation of soil cooling, which is carried out after pillar submersion.

EFFECT: invention provides for the possibility to submerge pillars of higher diametre (1-3 m and more) and larger depth (up to 30m and more).

4 cl, 4 dwg