concrete slab with square shaped holes regular grid |
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| navigate by keyword : accident backfill barrier blurred building bypass changing clay construction development ditch dividing equipment excavation excavator falling fence foundation gas groovy heavy hole industrial line maintenance marking metal mining outdoor pipe pipeline plumbing pressure protection quarry railing repair road safety work shaft site soil street temporary tube wall water wire worker |
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| repair of water supply, gas connection in deep excavation. the pipe is rusty and there is a main water seal. sheeting holes in the walls of the excavation against backfilling of the worker. plumbing |
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