Top-down method is one of the relatively new and cost-effective methods for stabilizing deep excavation walls. Structures with basement floors are generally built using this methods, in which the substructure and superstructure floors, after the excavation and stabilization of the pit walls, are implemented sequentially from the levels below the foundation to those of the top of the superstructure. In bottom - up construction methods nailing and anchorage are usually used as the typical shoring system. This has caused the top – down method to become an effective solution for the projects in which we are not allowed to use nailing and anchorage.
The Hakim - Saman Faraz project is one of the deep excavation stabilization projects in Istasazeh Construction Company, being responsible for both designing and implementing the shoring system. Furthermore, the evacuation of the excavated soil to outside was another responsibility we took in this project.
There were some advantages, particularly high implementation speed and use of steel structure, convinced our technical team to choose top-down method in this project. In addition, the simultaneous progress of the excavation operation, excavation walls’ stabilization, and steel structure installation was the other effective reason played a significant role for choosing the top – down method.
One of the main differences of stabilization projects with the top-down method is in carrying out the excavation and soil loading operations. In order to do this, a combination of existing equipment including bobcat, tower crane, dry boom crane and long mast crane. According to the project conditions, one or some of these methods can be used.
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