In construction, a D-wall, short for diaphragm wall, refers to a specific type of underground retaining structure.
Understanding D-Walls
A diaphragm wall is a reinforced concrete structure constructed in situ panel by panel. This method involves excavating narrow trenches (panels) sequentially and filling them with concrete, often while maintaining trench stability with a bentonite slurry or polymer. Once the concrete cures, it forms a continuous wall.
Key Features of a D-wall
- Material: Typically constructed from reinforced concrete.
- Construction Method: Built in situ (on-site) panel by panel.
- Primary Function: Serves as an underground retaining structure, often used for basement walls, cut-and-cover tunnels, or deep shafts.
When are D-walls Used?
According to the reference, D-walls are particularly valuable in specific construction scenarios:
- Congested Sites: They are often used on congested sites where space is limited.
- Proximity to Structures: They are effective when working close to existing structures.
- Challenging Conditions: They are preferred where excavation depth and ground conditions would prove problematic for piled walls. This suggests they are suitable for deep excavations and difficult soil conditions that might make traditional piling methods unsuitable or riskier for adjacent buildings.
In the basement market, specifically, D-walls provide a robust and space-efficient solution for creating deep retaining walls in challenging urban environments.
Diaphragm walls offer significant advantages in complex geotechnical situations, providing a stable and watertight barrier.
