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The top down construction method is one of the most effective ways of conducting deep excavations to build strong basements for superstructures. In this type of construction, a permanent structure is built from the top to bottom while excavating in levels towards the basement, as a retaining diaphragm wall provides support.
The entire process saves a lot of valuable time and helps complete the project well within the deadlines. This type of construction method is ideal in building modern-day superstructures like skyscrapers with basement storage units and parking lots, underpasses for subways and stations for metro trains.
Some of the advantages of diaphragm wall construction are:
It can provide a watertight and durable underground support for structures, and reduce noise and vibration during excavation and construction. It can save space and resources by eliminating the need for temporary shoring or sheet piling. It can allow for greater design flexibility and creativity.
It can be expensive and time-consuming compared to other methods. It can require skilled labour and specialized equipment. It can pose technical challenges and risks such as soil collapse, water leakage, or concrete defects.
The duration of diaphragm wall construction depends on various factors such as the size, depth, shape, and complexity of the wall, the soil conditions, the weather, the availability of materials and equipment, and the quality control measures. The average time for diaphragm wall construction is about 2 to 4 weeks per panel, where a panel is a section of the wall that is cast in one operation. However, this time can vary depending on the specific project requirements and circumstances.
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