Mills Tour

MILLS TOUR MILLS TOUR R E G U L A T I O N S , S T A N D A R D S A N D R E C O M M E N D A T I O N S 25 Excessively high stack of baulks Bearing over a gutter Bearing on hollow block NB : The scaffolding must not bear on manhole covers, drain covers or on ground with unknown bearing capacity. In these particular cases, either change the location of the scaffolding or increase the load spreading after taking expert advice. Verification It is important to check that F < P x S F = downward force on standard. p = ground bearing capacity. S = bearing surface area. If this is not case, the bearing area should be increased by using an additional support. In practice, wooden sole boards or baulks are often used for load spreading. The calculations should assume that the load is spread in a cone with an aperture angle of 90°. a T A 45° 45° F If the ground bearing pressure is still too high, baulks can be used in a stack. a = width of the base plate A = 2 T + a S = A 2 The baulks are frequently larger than the load spreading cone. If the baulk is larger than “a” in any direction, the dimension can still be used for calculating the bearing area provided that the dimension is less than or equal to L max where L max = a + 3 T A 1.5 T max 1.5 T max T L max F For the stability of the shoring, particular attention must be paid to the type of ground and its strength.