BS 7121-5:2019
$215.11
Code of practice for safe use of cranes – Tower cranes
| Published By | Publication Date | Number of Pages |
| BSI | 2019 | 128 |
This part of BS 7121 gives recommendations for the safe use of tower cranes, including self‑erecting tower cranes other than mobile self-erecting tower cranes (which are covered in BS 7121‑3).
NOTE The types of tower crane are set out in Annex A.
Subjects covered include safe systems of work, selection, erection, extension (including climbing), dismantling, maintenance, inspection, thorough examination (including testing), operation, and the planning and management of lifting operations. It also covers the appropriate selection and training of personnel involved in the safe installation and use of tower cranes.
This part of BS 7121 is intended to be read in conjunction with BS 7121‑1.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 7 | Foreword |
| 9 | 1 Scope 2 Normative references |
| 10 | 3 Terms and definitions |
| 13 | Section 1: General management of lifting operations with tower cranes 4 Management of installation and lifting operations 4.1 Safe system of work 4.2 Control of the installation or lifting operation |
| 14 | Figure 1 — Flow of information between personnel involved in lifting operations |
| 15 | 4.3 Duties of the person appointed to control the lifting operation |
| 17 | Table 1 — Example load and environmental hazards associated with lifting operations |
| 18 | Figure 2 — Relationship between complexity index and lift category |
| 19 | Table 2 — Illustration of the categorization of lifts based on environmental and load complexities |
| 21 | 5 Planning of the lifting operation 5.1 General |
| 23 | 5.2 Risk assessment 5.3 Method statements |
| 24 | 5.4 Team briefing/induction 5.5 Selection of cranes |
| 25 | 5.6 Siting of crane 5.7 Contracts |
| 26 | 6 Selection and duties of personnel other than the appointed person |
| 27 | Section 2: Selection of tower cranes 7 Selection of tower cranes 7.1 General |
| 30 | 7.2 Remote controls 8 Siting of crane 8.1 General |
| 31 | 8.2 Crane standing and support conditions 8.3 Out-of-service wind speed |
| 33 | Figure 3 — UK out-of-service wind region map for tower cranes |
| 34 | 8.4 Tower crane foundations |
| 37 | 8.5 Proximity hazards |
| 40 | Section 3: Safety and operational considerations 9 Safety 9.1 Modifications and materials 9.2 Product modifications and updates 9.3 Identification of person directing crane movements 9.4 Personal protective equipment (PPE) and safety equipment |
| 41 | 9.5 Work at height |
| 42 | 9.6 Access and egress (including emergency escape) |
| 46 | Figure 4 — Base enclosure |
| 47 | Figure 5 — Anti-climb panels Figure 6 — Trapdoor |
| 48 | Figure 7 — Trapdoor and base enclosure lock 9.7 Fire risk assessment and fire extinguishers |
| 49 | 9.8 Attachments |
| 50 | 9.9 Limiting and indicating devices |
| 53 | 9.10 Machinery guarding 9.11 Lightning protection 9.12 Base ballast |
| 54 | 9.13 Counterweight ballast 9.14 Travel alarms 10 Procedures and precautions 10.1 Operator working hours and resources Table 3 — Minimum number of operators required for continuous single shift operation of tower cranes 10.2 Crane operation 10.3 Working on cranes |
| 55 | 10.4 Crane not in regular use |
| 56 | 10.5 Reporting of defects and incidents 10.6 Leaving the crane unattended |
| 58 | 11 Operating conditions 11.1 Rated capacity |
| 59 | Figure 8 — Adverse effect of a swinging load on load radius |
| 60 | 11.2 Mode of operation and control |
| 61 | 11.3 Handling of loads near persons 11.4 Multi-crane lifting and lowering 11.5 Special duties 12 Lifting of pre-slung loads |
| 62 | 12.1 Single-use slings |
| 63 | 12.2 Lifting pre-slung loads 12.3 Load-resistant nets 13 Slinging and handling of loads 13.1 General 13.2 Signalling systems |
| 64 | 14 In-service and out-of-service wind speeds 14.1 In-service wind speed |
| 65 | 14.2 Consideration of wind speed during planning of lifts |
| 66 | 15 Crane documentation 15.1 Rated capacity charts 15.2 Instruction manuals 15.3 Reports of thorough examination/test certificates 15.4 Maintenance records 15.5 Erection/dismantling and transport 15.6 Operator’s documentation 15.7 Medical records 15.8 Plans and method statements 16 Pre-use checks, maintenance and inspection |
| 67 | 17 Thorough examination, including testing 17.1 General 17.2 Age and utilization 17.3 Change of ownership of the crane |
| 68 | Section 4: Tower crane erection, dismantling and alteration 18 Erection, dismantling and alteration 18.1 Planning |
| 72 | 18.2 Manufacturer’s erection and dismantling instructions |
| 73 | 18.3 Craneage 18.4 Components and materials |
| 75 | Figure 9 — Bolt grip length to diameter |
| 76 | Table 4 — Bolt and nut grades and properties |
| 77 | Figure 10 — Marking on initial installation |
| 79 | 18.5 Electrical supply |
| 80 | 18.6 Personnel 18.7 Briefing of the erection team 18.8 Communication |
| 81 | 18.9 Protection from falls from height 18.10 Control 18.11 Inspection before erection 18.12 Weather conditions |
| 82 | 18.13 Working area and exclusion zones 18.14 Installation and use of self-erecting tower cranes |
| 83 | 19 Tower crane climbing 19.1 General |
| 84 | 19.2 Structural considerations Figure 11 — Typical tie |
| 85 | 19.3 Risk assessment |
| 86 | 19.4 Method statement |
| 87 | 19.5 Climbing process |
| 91 | 19.6 Thorough examination, including testing of the crane after climbing |
| 92 | 19.7 Maintenance of climbing equipment |
| 93 | Annex A (informative) Types of tower crane and associated machinery Figure A.1 — Types of tower |
| 95 | Figure A.2 — Types of jib |
| 98 | Figure A.3 — Types of base |
| 100 | Figure A.4 — Rail-mounted tower crane |
| 101 | Figure A.5 — Lorry-mounted tower crane |
| 102 | Annex B (informative) Example evaluation of potential tower crane usage Figure B.1 — Example evaluation of potential tower crane usage |
| 103 | Annex C (informative) Tower crane classification Figure C.1 — Variation of service life with intensity of loading for Group 3 |
| 104 | Annex D (normative) Emergency plan |
| 108 | Annex E (normative) Rescue from height |
| 112 | Annex F (informative) Tower crane climbing |
| 113 | Figure F.1 — Typical external climbing sequence |
| 114 | Figure F.2 — Typical internal climbing sequence |
| 115 | Annex G (informative) Example of thorough examinations and checks for climbing frame |
| 118 | Annex H (informative) HSE guidance on luffing jib tower cranes |
| 119 | Annex I (normative) Example form showing controls for lifting inside the crane manufacturer’s radius Figure I.1 — Example form for lifting inside the crane manufacturer’s radius |
| 120 | Annex J (normative) Maintenance, inspection and thorough examination Annex K (informative) Hydrogen embrittlement in high-tensile fasteners |
| 122 | Annex L (normative) Recommendations to reduce the probability of failure due to HE |
| 123 | Table L.1 — Comparative testing regime: property grade 10.9/12.9 engineering bolts/ studs |
| 124 | Bibliography |
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