Analyses of cost and time require for the construction of RC diaphragms 25 depending on the method of execution

Abstract

Load in deep massive foundations is transferred to the substrate through surface elemets called the diaphragms. For the last ten years, reinforced concrete diaphragms has been used as a deep foundation cover in a pit for underground levels of buildings in urban areas. on an example of a multi-storey building with a basement level in urban environment, construction of monolithic reinforced diaphragms is planned in several phases. Analyses was conducted of cost and time required to construct two different variants of diaphragms for the purpose of obtaining an optimal construction method. The first variant is with construction of every second lamella (even and odd) and the second variant is with construction of every third lamella. Due to the proximity of surrounding buildings and impossibility of making a wide excavation, analysed reinforced concrete diaphragms are used as protection of the pit for the foundation slab, and at the same time as the walls of the basement level.