Patent EA-005441-B1 (EA)
Title: Bore reinforced concrete column and method for erecting thereof
Inventor: YURKEVICH PAVEL BORISOVICH
IPC: E02D5/38
Filed: 2003-11-05
Abstract: A bore column and method for erecting thereof can be used in building industry especially in constrained conditions and related to elements and methods for monolithic erection of buildings and structures, namely bearing reinforced concrete elements. The aim of said invention is to improve the accuracy for vertical mounting a support foundation and bearing elements of a building and to make it possible to build simultaneously structure upwards and downwards below a ground level. A reinforced concrete column comprises a reinforcing cage making monolithic with concrete mix and inserts. The column is adapted for lowering into a borehole, the cage having an upper bearing and a lower foundation parts. The cage is made as a column reinforcement cage arranged in the non-removable casing in a borehole with equivalent maximum outer diameter of the reinforcing cage Dk<Dc by value alpha = (2epsilong + 2Delta + 2tau), wherein Dk is equivalent maximum outer diameter of the column, Dc is borehole diameter, epsilong eccentricity of projection of geometric axis and projection of its center of masses in the plane of its top; Delta-deviation of the borehole axis from vertical axis; tau-deviation of the borehole axis in the plane. The inserts are arranged in the column upper bearing part at the levels of marks of the foundation slab and marks of floor slabs and made in form of closed-type contours with stiffening ribs, the column lower part is provided with a bottom hole chamber and fixing plates. The cage is made of steel, the non-removable casing is made from a pipe of round, rectangular cross-section. The part of reinforcing cage arranged in the column foundation part is connected by "lap joint" with the part of reinforcing cage arranged in the upper bearing part with attachment of elements of reinforcing cage. The equivalent outer diameter of the part of the reinforcing cage arranged in the upper bearing part of column in the borehole pits is equal or less than an inner diameter of the non-removable casing. A method of construction of a reinforced-concrete column, comprising operations of manufacture of the column reinforcing cage with inserts, concreting in a non-removable casing in a project position with the column making monolithic. When erecting the column combine operations manufacturing and mounting the column in the project position, a borehole is drilled having diameter Dc >= Dk + 2epsilong + 2Delta +2tau, wherein Dk is equivalent maximum outer diameter of the column, Dc is borehole diameter, epsilong eccentricity of projection of geometric axis and projection of its center of masses in the plane of its top; Delta-deviation of the borehole axis from vertical axis; tau-deviation of the borehole axis in the plane, The column reinforcing cage is vertically placed into the borehole with a gap from the borehole bottom by value P>=0.1Dc, the upper part is vertically centered with compensation for eccentricity and fixed from horizontal displacements; the upper part is vertically sinked onto the borehole base with fixation of the lower part by fixing plates, the lower foundation part of the column and the inner part of the non-removable casing of the upper bearing part of the column are made monolithic with concrete. Widening and cementation of the soil base are made via a process pipeline arranged inside the reinforcing cage, the space between the non-removable casing and the pit walls in the upper bearing part is filled with granular material.