Maysam Bahmani - M. Sc. Student, Faculty of Civil, Water and Environmental Engineering, Shahid Beheshti University,Tehran, Iran
Mohammad Yousof Nejati - M. Sc. Student, Faculty of Civil, Structural Engineering, Islamic Azad University Central Branch,Tehran, Iran

Lack of planting guardian structure at the time of drilling and excavation in high-density places of urban is one of the issues that bring life and financial losses. In this study, various kinds of planting guardian structures it has been investigated from the point of view of construction management and has been considered the special cost status of the city of Tehran. The presented instructions about the construction management and execution of guardian structure, and then documenting of information has been done by studying of under construction structure, in this study several kinds of guardian structures have been compared from structure management point of view and then with expressing the case studies which included place of Tehran in terms of locational situation and due to existing gas lifeline on the side of walls of the excavation, the most suitable guardian structure for this place of digging is proposed. The results of this research indicate that the suited guardian structure which is economic and technical among different methods, nailing, truss guardian structure and soldier pile for different excavation surfaces is a good solution for the issue of construction in problematic soils.

Guardian Structure, Excavation, Truss support system, Soldier Pile, Nailing