Patent EA-028789-B1 (EA)
Title: Joint of prefabricated reinforced concrete columns of the frame "arkos-2014" and method of performing the same
Inventor: MORDICH ALEXANDER IVANOVICH
IPC: E04C3/34
Filed: 2014-12-17
Abstract: The invention relates to construction and can be used in reinforced concrete frameworks of multi-storey buildings and structures. The joint of the prefabricated columns (Fig. 2) includes the end sections 1 and 2 of the joined links of the column. Sections 1 and 2 contain rods 3, torn at the ends and welded meshes 4. On the flat ends of the joined links of the column, by means of anchors 5, the number of which is determined by calculation in the form of reinforcing lugs, end plates 6 are attached. The end plates 6 of links 1 and 2 of the column are joined by means of studs or anchors 12 with fastening 10 and adjusting nuts 11. To the end plates 6 from the side of the joint gap 8, there are fastened compensators in the form of steel sheets 15. Between the compensators 15, on the axis of the column, there is placed a deformable centering spacer 14 made of mild steel. The dimensions of the spacer 14 are such that, under the action of the total design load on the column stresses in the spacer 14, exceeded design yield strength, but were less than 0.85R, where Ris the design resistance of steel by the compressive strength. Compensators 15 are made of steel with strength greater than the strength of steel of the spacer 14. The largest dimension of each side in their plane should not exceed the width of the spacer 14 by more than 3.0t in each direction from the faces of the spacer 14 in the initial state, where t is the thickness of the plate of compensator 15. For the most effective perception of compressive stresses by the concrete at the ends of the joined links 1 and 2 of the column, not less than half of the anchors 5 attached to plates 6 are concentrated at the axis of the column and placed parallel to the broken bars 3 of the column links. The method for making the joint provides for the insertion of the joint into the work under the load of studs or anchors 12 after the manifestation of plastic deformations in the centering spacer 14 due to the total design load. The proposed technical solutions are aimed at increasing the bearing capacity and reliability of the joint, reduction of the labor intensity of its arrangement. A deformable centering spacer is installed on the axis of the column and, after installation of the upper link of the column into the design position and fastening it with fixing nuts, the adjusting nuts in the gap between the ends are rotated and moved downwards, providing rest of the upper link of the column with its end face through the compensator onto the centering spacer, and immediately after completion of erection of the frame structure of the building and manifestation of plastic deformations in the centering spacer, adjusting nuts in the gap between ends are turned upward all to the stop against the end plate of the upper link of the column, and in the angular recesses this link of the column is repeatedly fastened by pressing against the end plate to the stop by means of the fastening nuts, whereupon the cavities of the gap and corner recesses are caulked with mortar.