Counter jib is a structural component of tower cranes that provides counterweight to balance the main jib during lifting operations.
The counter jib is a critical structural element in tower crane design, consisting of a rigid framework extending opposite the main lifting jib. It serves to counterbalance the load moment created by the main jib and lifted materials, ensuring crane stability and preventing tipping. Typically mounted on the slewing unit or tower top, it supports counterweights (concrete blocks or steel plates) and may house machinery like hoist motors. Its length and weight capacity are precisely calculated based on the crane's maximum load moment and working radius requirements.
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The counter jib balances the load moment created by the main jib and lifted materials, preventing crane tipping and ensuring operational stability.
Length is calculated based on the crane's maximum load moment, counterweight mass, and required stability factor, typically following ISO 4301 standards.
Fixed design; counterweight adjustment is achieved by adding/removing counterweight blocks rather than modifying the jib structure.
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