Tower Crane Safe Operation Guide per GB/T 23723.3-2010
GB/T 23723.3-2010 "Cranes — Safe Use — Part 3: Tower Cranes" is the core standard governing the safe operation of tower cranes. The standard specifies safe use requirements throughout the entire lifecycle of tower cranes — from design and installation to operation, maintenance, and dismantling — and is identical to ISO 12480-3:2005 (IDT). Tower cranes are among the highest-risk crane types in the industry, and safety management must be enforced across the full lifecycle of the equipment.
GB/T 23723.3-2010 is Part 3 of the crane safe use series, dedicated to the safe use and operational management requirements for tower cranes. Due to their significant working heights, wide operating envelopes, and complex erection and dismantling procedures, tower cranes demand particularly stringent safety requirements. This article provides a detailed interpretation of the standard's core provisions.
Standard Scope and Safety Responsibility Framework
GB/T 23723.3-2010 is the third part of the GB/T 23723 series. Safe use of tower cranes involves multiple responsible parties: the crane owner — responsible for ensuring the equipment meets standard requirements, establishing a maintenance system, and keeping records; the user unit (construction company) — responsible for installation acceptance, day-to-day use management, and periodic safety inspections; the operator — must be certified and perform pre-shift safety checks; the signaller (lifting director) — responsible for issuing lifting signals and monitoring hoisting operations; and the erection and dismantling crew — must hold appropriate qualifications and work strictly in accordance with the manufacturer's procedures.
Foundation Safety Requirements for Tower Cranes
The standard sets clear requirements for tower crane foundation safety: the foundation must be constructed in accordance with the design drawings and load values provided by the manufacturer. The user unit must not reduce foundation dimensions, lower the concrete strength grade, or decrease reinforcement quantities without authorization. Prior to foundation construction, the bearing capacity of foundation must be verified (the characteristic value of foundation bearing capacity f_ak must not be less than the manufacturer's specified value, typically ≥200 kPa). Tower crane erection may only proceed once the foundation concrete strength reaches at least 80% of its design strength. Upon completion, the foundation must undergo acceptance inspection, with records covering: foundation positioning coordinates and elevation, concrete test block strength reports, embedded part positioning deviations, and grounding resistance measurements. The foundation must be equipped with proper drainage to prevent water accumulation from softening the subgrade and causing settlement. A protective fence must surround the foundation area, with unauthorized personnel strictly prohibited from entering.
Erection and Dismantling Safety
Erection and dismantling are among the highest-risk phases of tower crane operations. The standard imposes strict safety requirements for these procedures: the erection unit must hold the appropriate qualifications (special equipment installation, retrofit, and repair license), and all personnel must be certified for their roles. A detailed erection plan must be prepared in advance and approved by the technical manager before work begins. A warning zone must be established at the erection site (with a radius not less than 1.2 times the crane's maximum slewing radius), and unauthorized personnel must be kept out. Erection work is subject to the following conditions: wind speed not exceeding force 7 (≤15 m/s), visibility of at least 500 m, and a firm, level foundation. Climbing and adding sections must strictly follow the five-step procedure — "counterweight balancing — climbing — introducing — positioning — locking" — with each step verified before proceeding to the next.
Erection only at ≥80% strength
Reinforcement per manufacturer's drawings
No erection in strong winds
position, lock
Angle ≤ ±15°
Add ties per approved plan
Safe Operation Rules
The standard sets out systematic requirements for safe tower crane operation. Pre-shift inspections must cover: no settlement cracks in the foundation; no deformation or obstructions on crane rails (for rail-mounted tower cranes); proper functioning of all limit switches; responsive and reliable braking; no abnormalities in wire ropes; intact hook anti-drop devices; and voltage within normal range (±5%). During operation: lifting must strictly follow the load capacity chart with overloading prohibited; hoisting and slewing must be smooth and steady — when the load is lifted 200 mm off the ground, the operator must pause to confirm reliable braking before continuing the hoist; in multi-crane cross operation scenarios, height differences and slewing ranges must be coordinated. When wind speed exceeds the permissible working limit, operations shall be stopped, the hook raised to its upper limit position, the boom turned to face the wind, and the slewing brake released to allow the boom to weathervane freely.
Maintenance and Periodic Inspection
Tower cranes must have a comprehensive maintenance system in place: routine maintenance (per shift) — visual inspection, functional testing, and lubrication; first-level maintenance (monthly) — bolt preload checks, wire rope and pulley wear inspection, and electrical system insulation testing; second-level maintenance (quarterly) — gearbox lubricating oil replacement, brake shoe gap adjustment, and slewing bearing bolt torque verification; annual inspection — periodic inspection by a special equipment inspection body (load test, UT sampling of structural weld seams, and grounding resistance measurement). Safety devices (load moment limiter, limit switches) must be tested at least once a month, with test records kept on file for review. Kelude provides full-lifecycle safety technical support and periodic inspection services for tower cranes, ensuring the equipment remains in a safe operating condition at all times.
Tower Crane Safe Use Requirements Comparison Table
The comparison table below summarizes the core parameters and configurations for tower crane safe use requirements, serving as a reference for equipment selection and operational personnel.
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| Safety Items | Basicrequirements | inspection interval | management requirements |
|---|---|---|---|
| Foundation and Ties | Foundation Bearing Capacity≥design value | monthly inspection Single | settlement Observation Records |
| safety device | Limit Switch/Load moment limiter (LML)/Anemometer | Before Each Shift | Function Test Records |
| Erection and Dismantling Management | Preparation of Special Plans | Before Each Erection/Dismantling | Review and Approval+Supervision |
| Operation Management | Prohibitedoverload/Wind Speed≤6Level - Shutdown | Per Shift | Operator Qualification+Hand Signals |
