Executing multi-level basements safely in congested urban sites without endangering neighbouring structures is a critical challenge. Asset Homes has addressed this by introducing diaphragm wall (D-Wall) technology for its premium project, Asset Vismayam, at a bustling site in Sasthamangalam, in the heart of Thiruvananthapuram, according to The Hindu BusinessLine.
Dual-Purpose Structural Solution
According to Sunil Kumar V, Founder and Managing Director of Asset Homes, D-Wall serves a dual purpose that conventional methods cannot easily match. It functions as an immediate shoring system to hold back earth during development and then becomes the permanent, heavy-duty retaining wall for the completed basement. "Since the wall is fully built before excavation begins, the need for separate temporary shoring structures is eliminated, helping accelerate overall project timeline," Kumar explained. He is a qualified civil engineer.
| Feature | Conventional Method | D-Wall Technology |
|---|---|---|
| Shoring during excavation | Separate temporary shoring required | Integrated dual-purpose wall eliminates temporary shoring |
| Permanent retaining wall | Designed and built separately | Same wall serves as permanent structure |
| Project timeline | Longer due to sequential shoring and wall construction | Accelerated by building the wall before excavation |
| Safety in dense urban areas | Risk of soil displacement and neighbour impact | Enhanced safety with trench stability from slurry |
Engineering and Construction Details
Asset Homes constructed a continuous, high-strength concrete retaining wall in place of conventional circular piles. The wall was built in sequential segments, typically measuring five metres in length and 60 cm in thickness, with the depth calibrated to specific excavation requirements of the site. During the initial trenching process, a specialised slurry mixture was introduced into the pit to prevent surrounding soil from collapsing inward. This ensures soil stability and prevents displacement or damage along boundary lines from the very first stage, The Hindu BusinessLine reported.
Kumar noted that the technology was adopted to address the challenges of executing multi-level basements safely in dense city locations without affecting neighbouring properties. "Given the highly congested nature of our Sasthamangalam site, we chose the D-Wall system to provide the surrounding community with the highest assurance of safety before any deep excavation began. While the technology is still relatively new in Kerala, it is considered the gold standard in major global cities where space is limited and safety cannot be compromised," he said.
Structural Advantages During Monsoon
The system also offers significant structural advantages during heavy monsoon by creating a rigid and secure perimeter around the excavation area. This provides a safer working environment for labourers and supports greater precision, quality, and long-term stability in the foundation and basement construction, according to Kumar.
Industry Impact
Industry observers believe the adoption of D-Wall technology at Asset Vismayam signals a significant shift in Kerala's real estate and construction sector, especially as basement parking and multi-level underground facilities become increasingly important in fast-growing urban centres. Arun Nadig, a structural consultant, said, as basement parking and multi-level underground facilities become more essential in the state's expanding cities, it sets a new benchmark for what is possible and what should be expected in urban engineering across the state.
D-Wall technology brings globally proven construction methodology to a highly congested urban project site for the first time in Kerala. For technology leaders in construction and infrastructure, this deployment demonstrates how advanced engineering techniques can solve safety, timeline, and quality challenges in dense urban environments.
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