513 Load bearing walls shall be supported by strip footings located at a depth

513 load bearing walls shall be supported by strip

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5.1.3 Load bearing walls shall be supported by strip footings located at a depth of at least 600 mm and constructed with the following minimum dimensions: a) thickness – 225 mm; and b) width - 450 mm for 150 mm blocks and 600 mm for 200 mm blocks i.e. a minimum of 3 times the width of the wall supported by the footing. Interior blockwork partitions shall be supported by thickening and reinforcing the floor slab under such partitions . 5.1.4 Square concrete or blockwork columns shall be supported by square pad footings located at a minimum depth of 1000 mm and constructed with the following minimum dimensions: a) thickness – 225 mm; and b) side of square – 600 mm. 5.1.5 When the ground is subject to drying resulting in cracks or fissures, the depth of the footing should be appropriately increased as determined by a professional engineer. The increase in depth can be minimized if the foundation is protected by adequate surface paving. 5.2 Reinforcement 5.2.1 For s trip footings, the reinforcement shall consist of a minimum of: a) three 10 mm diameter bars placed longitudinally; and b) 10 mm diameter bars placed transversely spaced at no more than 250 mm between centres; see Figure 5-3.
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PCTTS 599: 20XX 77 5.2.2 For pad footings, the minimum reinforcement shall be 12 mm diameter bars at 150 mm between centres in both directions forming a mesh; see Figure 5-4 . 5.2.3 Bars may be suitably cranked, bent or lapped at the ends. Lapped or cranked lengths shall be a minimum of 40 times the diameter of the bars being joined. Table 5-1 gives the recommended lap lengths for steel reinforcement. Table 5-1 Recommended lap lengths for steel reinforcement Reinforcement Lap length 6 mm diameter bar 300 mm 8 mm diameter bar 350 mm 10 mm diameter bar 400 mm 12 mm diameter bar 600 mm 16 mm diameter bar 750 mm Mesh 150 mm or one square, whichever is greater
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PCTTS 599: 20XX 78 Figure 5-1 Types of foundation Figure 5-2 Details of ground floor slab on grade Suspended slab 125mm (min) Slab on grade 100mm (min) Suspended slab 125mm (min) Crawl space 300mm (min) 300mm (min) 450mm 300mm (min) 600mm (min) Slab on grade 100mm (min) 1000mm (min) 450mm (min) 300mm (min) (d) Raft foundation Crawl space 300mm (min) (a) Pad footing (b) Strip footing (c) Pile foundation grade minimum 150mm blockwork 150mm blockwork r.c. tie beam 600mm min 300mm minimum 100mm slab minimum 200 mm min well compacted gravel or marl in 100mm layers 0.15mm polythene damp proof course 50mm sand blinding Local thickening 100mm x 100mm 450 BRC
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PCTTS 599: 20XX 79 Figure 5-3 Arrangement for strip footing Figure 5-4 Typical pad footing details 75 75 75 1000 300 75 grade 100 125mm slab minimum 150mm blockwork 600mm min if 200mm blockwork 3 times 200mm 100 (a) 150 mm blocks (b) 200 mm blocks 10 mm bar at 250mm centre to centre 450mm min 225 600mm mini 150mm blockwork minimum r.c. tie beam 150mm blockwork 125mm slab minimum grade 225 225 600mm min 75 75mm min 75 600mm min 12mm rods 150mm crs.
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