Development of the Technological Foundations of High - Speed Energy-Efficient Building Systems and Structures in the Conditions of Iraq

Construction still makes extensive use of monolithic building systems as the primary system. A threaded connection of precast concrete columns is proposed, which can be used to connect elements of prefabricated buildings and structures. The contact-screw connection consists of an upper and lower column; both have cylindrical external steel threads in the end section. Eight steel rods are welded to the baseplate of the cylindrical base of the upper and lower parts. The strength of the column's connection is determined by ensuring the transmission of axial loads and torque in the joint when catting and wrinkling that may occur between connected columns. The structural characteristics of the connected columns were determined in accordance with the requirements of the standards. By means of the necessary calculations for the screw connection of columns made of precast concrete (steel-reinforced concrete, pipe concrete), the corresponding rigidity and strength were confirmed.

Also, an innovative technology of passive assembly of prefabricated elements in volume-block system is proposed, which will allow creating a building with the maximum possible energy-efficient design of fully assembled buildings. The results showed that it is possible to reduce technological processes by up to 50%, and this leads to a reduction in costs and time. The conducted study of the dry mechanical column - column joint based on precast reinforced concrete and passive assembly of prefabricated elements in the volume-block system confirmed the possibility of its used in construction in Iraq.