800mm Steel Support

Steel supports are a commonly used type in foundation pit support systems. Each steel support is composed of multiple standard steel pipe sections spliced together. The two ends of the steel support are fixed and movable, and the length of the movable end is adjusted through hinges. This replaces the traditional manual pre-application of axial force on steel supports, achieving automated "pressure holding and pressurization", and ensuring "visual control and adjustability". Strengthen the control and management during the construction process of steel supports for deep foundation pits, dynamically monitor the axial force data during the construction process, and effectively control the construction risks.

Product application

For deep foundation pit construction, 800mm Steel Support can be adopted, and corrosion-resistant treatment should be selected according to the environment (such as high groundwater level or corrosive environment). The principle of "support first, then excavation, layer-by-layer excavation, layer-by-layer support, symmetrical balance, and time-limited installation" should be followed, and the application of prestress and deformation monitoring should be strictly controlled. To deal with emergencies, it is recommended to prepare a certain number of spare brackets, jacks and key components in advance, and take protective measures in rainy days. Prestressed steel supports are an important part of steel support construction and one of the key means to control the deformation of foundation pits.

The foundation pit adopts bored cast-in-place piles combined with internal braces as the support structure. Except for the first steel support which is directly supported on the pile bearing beam, the rest are all supported by steel purlins. The pile Angle and the variable cross-section external supports are inclined planes, while the rest are opposed supports. To facilitate construction, it is required that steel pipes, while meeting the spacing requirements, avoid the central columns of the main structure as much as possible. Meanwhile, to ensure the stress on the inclined supports, triangular blocks are set on the steel purlins at the corresponding positions of the inclined supports to ensure that the force-bearing surface is orthogonal to the inclined surface.

Main advantages

800mm Steel Support has many advantages in foundation pit support structures. They significantly reduce costs and are more suitable than anchor cables under limited on-site conditions. They also offer shorter construction periods and can be reused. The overall frame design of the metro steel support is safe and reasonable, and it is very convenient to install and disassemble, without the need for complicated procedures. Besides, they are easy to learn, practical and efficient.

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