Small box girder formwork

The applicable scenarios for box girder formwork include: 1) Core areas of transportation infrastructure ① Highway and railway bridges Used for cast-in-place or prefabricated box girder construction, ensuring the forming accuracy and stability of core load-bearing structures such as bridge main beams and decks, suitable for high load scenarios such as highways, railway bridges (including cross river and cross sea bridges), etc. Prefabricated box girder formwork can produce standardized components in bulk, improving construction efficiency and reducing on-site operational risks. ② Urban Elevated and Overpass Bridges Suitable for the cast-in-place construction of box girders for urban elevated bridges and light rail elevated structures, meeting the load-bearing requirements of complex transportation networks and providing a smooth driving experience. ③ Large-span bridge Box girder formwork has become the preferred choice for the design of long-span bridges such as cable-stayed bridges and curved bridges due to its strong bending and shear resistance, especially suitable for bridge projects with spans exceeding 50 meters. 2) Special structures and complex scenes ① Complex terrain bridges: Continuous cast-in-place box girders are achieved through the use of mobile formwork methods (such as sliding formwork) to adapt to irregular terrain such as mountainous areas and slopes, reduce reliance on ground supports, and ensure traffic needs. ② Irregular or curved bridges: Adjustable steel formwork (such as hydraulic box girder formwork) supports precise forming of irregular box girders with curved or variable cross-sections, meeting special design requirements. 3) Construction method and template type ① Cast in place construction Mobile formwork method: using the already poured bridge section sliding formwork to achieve continuous high-altitude cyclic operation, improve efficiency and reduce safety risks (such as urban elevated construction). Hydraulic template: Controlled by a hydraulic system to open, close, and position the template, suitable for high-precision and high-strength cast-in-place scenarios (such as cross river bridges). ② Prefabricated construction Fixed or mobile external formwork combined with bottom formwork and internal formwork (mechanical or hydraulic demolding) for mass production of prefabricated box girders, suitable for rapid construction of standardized bridge components. 4) Other engineering fields ① Water conservancy engineering: In the construction of box shaped structures for some water gates, dams, and other facilities, formwork is required to ensure the quality of concrete forming. ② Underground engineering: The pouring of top box girders for projects such as subway tunnels and underground passages requires the use of high-strength formwork to withstand soil pressure. 5) Core advantages and technical requirements ① Structural advantages: The box shaped cross-section provides high integrity and deformation resistance, suitable for high-frequency vibration (such as railways) and long-term durability requirements. ② Economy: Segmented construction saves template resources, and when combined with hanging baskets or mobile formwork, it can significantly reduce costs. ③ Sealing: Sponge strips and other sealing measures are used at the joints of the formwork to prevent leakage and ensure the smoothness of the concrete surface. Note: The core application scenarios of box girder formwork include highway/railway bridges, urban overpasses, large-span bridges, and complex terrain engineering. Its flexibility and high adaptability make it an indispensable key technology in modern transportation infrastructure.