The Research Of Super Deep Whirlpool Foundation Pit Construction Technology

This research objective of this article is the construction technology of the hot rolled whirlpool foundation pit at the stainless branch of Baosteel. The main contents are as below.1. Based on the site geological conditions, innovative slot wall cleaved with concrete slurry reinforced construction technology and atypic tenon style concrete connection construction technology was applied for the soft soil foundation construction. Afterwards the 1.0m thickness with -53.0m depth underground concrete diaphragm wall was built with that super deep underground concrete diaphragm wall construction technology.2. Dewatering dry bottom closure technology used during deep well pressure release construction. There are two layers of underground water in this project with the maximal underground water level -18.1m. After using this technology, the construction can be lees affected by the deep underground water and it also reduced the ground settlement scope& degree. At the same time, it ensured the safety closure of the foundation pit and protected the surrounding environment. This method consolidates and develops the deep well dewatering dry bottom closure technology under soft soil foundations.3. Combined with the grade half athwart method for structure construction, excavation without support technology, top ring beam and the supporting wall cast together method, supporting wall 5-7m grade half athwart construction technology, one new construction technology which is underground structure grade half athwart method with reverse connection construction technology was used. With adopted the cove effect, this construction method create a better environment for soil excavation without support at foundation pit.4. This article briefly introduced the information construction technology, performing the centrifugal module test with the site conditions, using the information site monitoring and alarm system, as well as using the process monitoring data in guiding the practical construction &design.5. Combined with the construction experience and the practice of the whirlpool pit project, one set of new construction technology is developed for deep foundation pit construction. There are the integrated new construction technologies like super deep concrete diaphragm wall construction method, grade half athwart method for structure construction with excavation without support technology, dewatering dry bottom closure technology used during deep well pressure release construction, information monitoring methods, etc.