GB/T 17909.3-2006 is Part 3 of the crane operation manual series, specifically governing the content, format, and safety requirements for tower crane operation manuals. Because tower crane erection and dismantling are complex procedures, the operation manual must include detailed procedures and safety precautions for these phases. This article provides an in-depth interpretation of the standard's drafting requirements.

Standard Scope and Core Manual Content

GB/T 17909.3-2006 is identical to ISO 9928-3:2007 (IDT) and establishes specific requirements for tower crane operation manuals, building on the general principles of GB/T 17909.1. Unlike mobile cranes, tower cranes are typically erected on site and remain in fixed service for extended periods. Beyond routine operation, the manual must therefore emphasize: foundation design and bearing capacity requirements (determining where the crane can be safely erected), tie-in strut design and installation (governing how high the crane can be safely climbed), the climbing and adding sections procedure (the most hazardous phase of erection and dismantling), and storm protection measures.

Required Contents of the Operation Manual

Tower crane operation manuals should be organized as follows: Chapter 1 — General description: crane model, manufacturer, serial number, year of manufacture, scope of application (duty level and limitations). Chapter 2 — Technical parameters: maximum lifting capacity and working radius for each operating condition (load capacity chart), free-standing height and maximum tied-in height, tower mast cross-section dimensions and main chord member specifications, slewing speed, derricking speed, and lifting speed (values for each gear), total dead weight and ballast/counterweight weights, and foundation loads (maximum vertical force, horizontal force, and bending moment).

Chapter 3 — Foundation and soil conditions: foundation types (cross-shaped, square, pile foundations, etc.), foundation dimensions and reinforcement drawings, concrete strength grade (≥C30), bearing capacity of foundation (≥200kPa), and soil treatment requirements. Chapter 4 — Erection and dismantling: site requirements (flatness, ground bearing capacity, obstacles within the slewing radius); selection of the erection crane (capacity and jib length); tower mast standard section installation procedure (weight and lifting point of each section); balance arm and jib installation procedure (including the timing for installing counterweights); climbing and adding sections procedure (full sequence from introducing the mast section, climbing, pushing out, and seating); and tie-in strut installation procedure (tie spacing and strut angles).

Chapter 5 — Operating instructions: pre-operation safety inspection checklist; operating methods and precautions for the hoisting, slewing, and derricking mechanisms; anemometer instructions (maximum wind speed for working condition ≤20m/s); load moment limiter (LML) settings and alarm meanings; and lighting requirements for night work. Chapter 6 — Safety devices: setting methods and testing intervals for the load moment limiter, limit switches (height limit, radius limit, slewing limit, trolley travel limit), anemometer, and anti-collision system (when multiple tower cranes operate on site).

Special Requirements for the Climbing Procedure

Climbing and adding sections is the most hazardous phase of tower crane erection and dismantling — the tower mast is not fully fixed during this process, and any error can cause the mast to collapse. The standard requires the operation manual to include a detailed climbing procedure: pre-climb preparation — check the oil level and hose connections of the climbing hydraulic system, confirm proper engagement between the climbing cross beam and the climbing steps, and achieve tower balance (by moving the trolley or adjusting the suspended load). Climbing operation — hydraulic pump station operating steps (start, pressurize, climb, mechanically lock, retract, and proceed to the next stroke), and mechanical locking after each mast section is climbed (inserting safety pins or seating the climbing pawls). Precautions during climbing — wind speed must not exceed force 7 (≤15m/s), slewing and hoisting are prohibited during climbing, and the climbing cross beam must be fully engaged before starting the next stroke.

Preparing the Load Capacity Chart

The standard requires the load capacity chart to include: radius-to-capacity values for all jib length combinations (various main boom lengths, and main boom plus jib configurations); a radius increment of no more than 1m between data points (0.5m for fast-erecting tower cranes); and the load capacity data presented in both tabular and graphical form. The chart must also show the lifting height curve (maximum lifting height at various radii) and the capacity limitation curve (the rated load curve set by the load moment limiter, which must not be exceeded in service). Values in the load capacity chart must include the weight of the hook and lifting spreader (or state clearly that they must be deducted separately). Kelude tower crane manuals supplied with the machine are prepared in accordance with this standard, available in both Chinese and English, and include full-color load capacity charts.

Tower Crane Operation Manual Content Checklist

The comparison table below summarizes the core parameters and sections required in a tower crane operation manual, serving as a reference for crane selection and daily use.

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