Four-link portal crane anchoring structure

The anchoring structure of a four-link portal crane mainly involves the connection method between its gantry and traveling mechanism and the foundation to ensure stability under external forces such as wind load and lifting load.

The core of the anchoring structure lies in the connection design between the gantry and the foundation. The lower traveling section of a four-link portal crane consists of the gantry and the traveling mechanism. The gantry, as the main load-bearing structure, is firmly connected to the concrete foundation through anchor bolts or embedded parts. This connection must be able to withstand overturning moments, horizontal shear forces, and other loads to prevent overall displacement or overturning. The layout of the anchor points and the bolt specifications need to be calculated and determined based on parameters such as the crane's rated lifting capacity, working class, and local wind pressure.

Stability is the key to the anchoring design, requiring comprehensive consideration of both overall and local factors. Overall stability requires the gantry foundation to have sufficient anti-overturning and anti-slip capacity, usually achieved by increasing the foundation's base area or adding counterweights. Local stability focuses on the buckling of components such as the gantry columns and horizontal struts under pressure, requiring stress analysis and section verification to avoid local instability affecting overall safety.

In practical applications, anchoring structures need to be optimized based on specific working conditions. For example, in port environments, anchoring designs need to take into account wave loads and corrosion protection, while regularly checking the tightness of anchor bolts and foundation cracks to maintain long-term reliability.