2) Ground Stability.
• When planning a lift consideration must be given to the ground conditions. Outrigger and track loading should be established before sitting the crane, the safe load limits should be identified against the specification of the concrete, foundations etc. of the area involved. For other areas the density and compaction qualities should be assessed.
• Underground hazards arise from cellars and basements (filled or not), recently backfilled excavations, tidal or flood water areas where the ground water table is high, buried pipes and mains etc.
• On soft ground it will be necessary to pack solid material(timber, digger mats, hard core) beneath crawlers and/or outriggers to allow for setting under load. Bearing plates or grillage may be necessary to distribute the loads. For lorry mounted and mobile cranes, if there is any doubt about the suitability of the ground, the following procedure must be adopted:
- Test by lifting the load approximately 150 mm. and holding for a period over one outrigger at maximum possible safe radius to see if the outrigger sinks.
2) Ground Stability.
• When planning a lift consideration must be given to the ground conditions. Outrigger and track loading should be established before sitting the crane, the safe load limits should be identified against the specification of the concrete, foundations etc. of the area involved. For other areas the density and compaction qualities should be assessed.
• Underground hazards arise from cellars and basements (filled or not), recently backfilled excavations, tidal or flood water areas where the ground water table is high, buried pipes and mains etc.
• On soft ground it will be necessary to pack solid material(timber, digger mats, hard core) beneath crawlers and/or outriggers to allow for setting under load. Bearing plates or grillage may be necessary to distribute the loads. For lorry mounted and mobile cranes, if there is any doubt about the suitability of the ground, the following procedure must be adopted:
- Test by lifting the load approximately 150 mm. and holding for a period over one outrigger at maximum possible safe radius to see if the outrigger sinks.
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2) Ground Stability.
• When planning a lift consideration must be given to the ground conditions. Outrigger and track loading should be established before sitting the crane, the safe load limits should be identified against the specification of the concrete, foundations etc. of the area involved. For other areas the density and compaction qualities should be assessed.
• Underground hazards arise from cellars and basements (filled or not), recently backfilled excavations, tidal or flood water areas where the ground water table is high, buried pipes and mains etc.
• On soft ground it will be necessary to pack solid material(timber, digger mats, hard core) beneath crawlers and/or outriggers to allow for setting under load. Bearing plates or grillage may be necessary to distribute the loads. For lorry mounted and mobile cranes, if there is any doubt about the suitability of the ground, the following procedure must be adopted:
- Test by lifting the load approximately 150 mm. and holding for a period over one outrigger at maximum possible safe radius to see if the outrigger sinks.
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