Several Process Requirements for Tower Crane Installation

As China’s urbanization accelerates, tower cranes are used more and more, and the safe use of tower cranes has become an important part of safe construction in China’s urbanization. In order to install tower cranes safely, ensure safe construction, and carry out tower crane operations safely, the following process requirements apply to tower crane installation.

Before construction, the project technical person in charge shall prepare the tower crane installation and dismantling plan and the installation and dismantling safety technical disclosure, so that all personnel participating in tower crane installation and dismantling know their work posts and work contents, technical requirements, and safety precautions, and strictly comply with them during construction.

Tower crane installation process standard requirements: The tower crane must have good grounding protection to prevent lightning strikes (use multi-strand copper wire of not less than 10 mm², connected by welding), and the grounding resistance shall not be greater than 4 ohms. After the tower crane is installed, under no-load conditions, the verticality deviation between the tower body and the ground shall not exceed 3/1000. The pre-tightening force of connecting bolts and pins of all tower crane parts shall meet requirements. The values of the hydraulic system and safety valves, the adjustment values of electrical system protection devices, and the adjustment values of other mechanisms and components shall all meet requirements. The comprehensive error of the moment limiter shall not exceed 8% of its rated value. When the rated value is exceeded, the moment limiter shall cut off the power supply in the direction of hook rising and amplitude increasing, but the mechanism may move in the direction of lowering and amplitude reducing. Over-height limiter: when the rising height of the hook frame is not less than 1 m from the fixed pulley, the over-height limiter shall be able to cut off the power supply in the hook rising direction. Amplitude limiter: when the trolley travels to 0.5 m from the end of the jib, it shall be able to cut off the power supply in the trolley travel direction. After tower crane installation is completed and checked without error, no-load, static load, and dynamic load tests must be carried out. The static load test lifting weight is 125% of the rated load, and the dynamic load test lifting weight is 110% of the rated load. It can be delivered for use only after passing the tests. For other matters not covered, execute in accordance with the Standard for Safety Inspection of Building Construction (JGJ59-99) and the tower crane operation manual.

Tower crane installation procedure: Fix tower crane foundation → Install tower crane standard sections to 20 m → Hoist tower head, slewing platform and operator cab → Hoist counter-jib, winch, and distribution box → First hoist one counterweight block → Hoist jib and support frame system (including trolley traction mechanism and trolley) → Hoist the remaining two counterweight blocks and reeve the relevant rope system → Inspect the mechanical parts, structural connecting parts, electrical parts, etc. of the whole machine → Adjust all safety protection devices → Carry out trial run.