Methodological support for the analysis of installation defects in civil buildings precast-monolithic structures (by the “KUB-2,5” system example)

Precast-Monolithic housing construction technology is currently one of priorities for the domestic construction industry development. However, despite the undeniable advantages of this technology, buildings constructed with the precast-monolithic frame have a number of disadvantages limiting their mass use. Long-term practice of civil buildings structures technical inspection allowed the article authors to reveal a problem of detecting and evaluating defects in the precast-monolithic structures installation in addition to the known factors limiting the precast-monolithic systems development and widespread use. The revealed problem is caused by insufficient manufacturability of applied operational and acceptance control processes. Defects detection in the structures installation of a building load-bearing frame is carried out during the structures technical inspection with the methods regulated in SP 13-102–2003 “Rules for the load-bearing building structures inspection in buildings and structures”: design, working and as-built documentation analysis; structures visual inspection; structural reinforcement parameters determination; concrete strength control of prefabricated and monolithic structural elements; welds quality control; verification calculations of the load-bearing frame and its individual structural elements for existing or design loads. The article presents a structured list of the most common defects in the load-bearing precast-monolithic structures of the civil buildings frame installation (with the “KUB-2,5” system example). The defects were determined on the base of the technical surveys results carried out by the authors. A clear algorithm for the identified installation defects assessing is proposed. The installation defects presented in the article allow us to conclude that there is a need for thorough regulation of construction and installation work and subsequent operational construction control, including an algorithm for assessing the defects impact on the load-bearing frame reliability.