The drawing shows a heavy reinforced concrete foundation slab and pit wall assembly with a mud slab at the base, waterproofing membrane layers, and steel reinforcement detailing. Dimensions, concrete thicknesses, and reinforcing bar specifications such as 25M at 250mm spacing each way top and bottom are indicated. The assembly connects the main floor slab level down to the recessed pit or tunnel structure.
Text on the drawing
T.O MAIN FLOOR 100.00 250 1054 650 915 25M@250 EW T&B INSULATION SEE ARCH, TYP WATERPROOF MEMBRANE SEE ARCH, TYP 50 MUD SLAB 1200 300
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