Transcription of High Mast Lighting Systems - Foundation Design
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High Mast Lighting Systems - Foundation Design
High mast systemsTypes of subsoilCondition of subsoilField test applicableApproximate allowance bearing pressure kN/m2 RockNot inferior to sandstone, limestone or firm chalkRequires at least a pneumatic or other mechanically operated pick for excavation1000 Gravel, sandCompactRequires pick for excavation. Wooden peg 50mm2 in cross section is hard to drive beyond 150mmDense to very dense 150-400 Loose to medium dense 50-250 Clay, sandy clayFirmCan be moulded by substantial pressure with the fingers and excavated with graft or spade50-100 Sand*, silty sand*, clayey sand*LooseCan be excavated with a spade. Wooden peg 50mm2 in cross section can be easily driven<75 Silt*, clay*, sandy clay*, silty clay*SoftFairly easily moulded with the fingers and readily excavated<75 Silt*, clay*, sandy clay*, silty clay*Very softNatural sample in winter conditions exudes between fingers when squeezed in fist<75 These values are provided for guidance only. If in any doubt, consult a qualified civil engineer.
52 High mast systems abacuslighting.com Foundation bolts Foundation bolts are supplied with nuts, washers, a spacer plate and a fixing template in either wood
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