Sliding Rail Air Rib Foundation Pit Air Membrane is a special air membrane structure tailor-made for construction of deep and long-span foundation pits. Adopting the combination of air rib support and sliding rail movement, it addresses the drawbacks of traditional foundation pit supports such as steel structures and concrete, including slow installation, poor flexibility and high costs. It integrates temporary enclosure, environmental management and safety protection throughout foundation pit construction.
I. Core Structure: Dual Advantages of Air Ribs + Sliding Rails
The air rib support system replaces traditional steel trusses and concrete columns. Inflated rib beams made of high-strength wear-resistant membrane materials (PVDF, PTFE, etc.) serve as the main load-bearing components. Continuous stable inflation at 0.02-0.05MPa forms rigid support, enabling column-free long spans of 20-50 meters. It fully maximizes internal construction space of the foundation pit without mechanical operation being blocked by supporting structures.
For the sliding rail system, steel rails are installed on the crown beams on both sides of the pit or hardened ground around the pit. The main membrane body is connected to the sliding rails via bottom pulleys, allowing segmented movement or full opening/closing along with construction progress. For example, it can move section by section along the length of the pit, or open on one side for material transportation. No overall dismantling and reconstruction is required, matching the phased excavation and segmented construction workflow of foundation pits.
II. Core Advantages: Preferred Choice for Foundation Pit Construction
Single section installation completed within 3-7 days (factory prefabrication + on-site inflation); column-free layout for 100% usable construction space; movable and openable to suit construction schedules with reusability; fully sealed structure compatible with sprinkler and fresh air systems for dust and noise control; one-time investment reduced by 30%-50%, with lower amortized costs for repeated use.
III. Applicable Scenarios: Suitable Foundation Pit Projects
Foundation pits in central urban areas: Densely built surrounding areas with strict dust and noise control (near residential buildings and schools). The fully sealed structure keeps PM10 ≤50μg/m³ and cuts noise by 15-20dB.
Deep long-span foundation pits: Projects with excavation depth ≥8m and span ≥20m (metro stations, underground complexes, etc.). The column-free design accommodates large shield machines and excavators.
Foundation pits for seasonal construction: Regions with heavy rainfall or severe cold (rainy seasons in southern China, winters in northern China). The enclosed membrane forms a controllable microclimate inside, preventing rainwater backflow and low-temperature damage to concrete curing.
Temporary reusable foundation pits: Short-cycle projects requiring reusable supporting structures (municipal pipeline trenches, temporary parking lot pits). The sliding rail design enables multi-scenario reuse on the same site.
In conclusion, the sliding rail air rib foundation pit air membrane serves as a new lightweight, flexible and energy-saving foundation pit support solution. It perfectly meets modern urban construction’s triple requirements for high efficiency, environmental protection and safety, and has been widely applied in foundation pit projects for metro, municipal engineering and real estate construction.
