GB/T 31052.11-2015 is Part 11 of the crane inspection and maintenance standard series, providing detailed requirements for daily inspection, periodic examination, and maintenance procedures specific to tower cranes. Due to their towering structures and demanding operating conditions, tower cranes require the most rigorous inspection and maintenance regimes of any crane type. This article explains the core requirements of the standard.

Standard Scope and Inspection Framework

GB/T 31052.11-2015 is Part 11 of the GB/T 31052 "Cranes — Inspection and Maintenance" series, specifically covering tower cranes. The inspection and maintenance framework for tower cranes is organized into four levels: Daily inspection (each shift) — visual checks and functional tests by the operator, covering safety devices, wire ropes, and the foundation; Monthly inspection — performed by qualified maintenance personnel, covering bolt torque, weld seams, and the electrical system; Quarterly inspection — covering the slewing bearing, gearbox, and hydraulic system; and Annual examination — carried out by a special equipment inspection body, including load testing and structural flaw detection.

Daily Inspection Checklist

The following checks must be performed before each shift: Foundation — no settlement cracks, anchor bolts secure, grounding wire intact. Tower mast — perpendicularity measured with a theodolite (deviation ≤1/1000), all connection bolts secure (visual check of loosening prevention marks). Cabin — all control grips in neutral position, emergency stop button functional, anemometer reading accurate, load moment limiter (LML) self-test passed. Wire ropes — no visible wire breaks or kinks, properly spooled, adequate lubrication. Hook block — anti-drop device intact, no deformation at the hook mouth. Limit switches — functional test of hoisting height limiter, working radius limit, and slewing limit (power to hazardous directions must be cut off when activated).

Periodic Inspection Items

Monthly and quarterly inspection contents: Bolt torque inspection — torque on critical fasteners including tower mast connection bolts, slewing bearing bolts, and boom connecting pins checked quarterly, with a sampling rate of ≥20% and each bolt torque ≥90% of the specified value. Weld seam inspection — visual examination of tower main chord welds, boom joint welds, and tie-in strut welds for cracks. Slewing bearing — smooth rotation without abnormal noise or jamming, proper lubrication of the large gear ring, no pitting on tooth surfaces. Gearbox — correct oil level, no oil leakage, no abnormal noise during operation. Brake — brake shoe clearance 0.5–1.5 mm, brake lining thickness ≥50% of original. Electrical system — cables free of aging or damage, no sparking at slip rings, insulation resistance ≥1 MΩ. Hydraulic system (climbing mechanism) — correct oil level, no leakage in hoses, hydraulic lock valve functioning properly.

Wire Rope and Lifting Spreader Inspection

Tower crane wire ropes require more frequent inspection than other crane types: the hoisting rope is visually inspected every shift, with a detailed weekly inspection (broken wire counting + diameter measurement). The luffing wire rope (on luffing jib tower cranes) and the trolley traction rope (on trolley luffing types) are inspected weekly. Wire rope discard criteria follow GB/T 24811.1. The hook undergoes monthly MT flaw detection, with particular attention to the neck transition zone and the inner surface of the hook mouth. Pulleys are checked quarterly for groove wear (groove depth wear ≤25% of original depth). Kelude Heavy Industry's tower crane inspection and maintenance services strictly follow this standard, maintaining an inspection log for every crane with all results recorded and archived.

Tower Crane Inspection and Maintenance Comparison Table

The comparison table below lists the core parameters for tower crane inspection and maintenance, for reference by selection and operating personnel.

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Frequently Asked Questions

Q: What is the typical lead time for a custom crane order?
A: Lead times vary depending on the complexity and specifications of the crane. Generally, standard models can be delivered within 8-12 weeks, while fully custom solutions may take longer. We provide a detailed schedule upon project confirmation.

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A: We offer a comprehensive warranty on all our cranes, covering defects in materials and workmanship. The specific terms and duration of the warranty are detailed in our contract and can be customized based on the project scope.

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