Describe with sketch any two joints in doors and window frame.

Describe with sketch any two joints in doors and window frame.
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1. Connections must be adequate structurally. 2. Means of connections between adjacent must allow safe and speedy erection regardless of minor inherent inaccuracies in precast elements and in-situ concrete. 3. Physical details of joint and connections must permit economic manufacturing. 4. Spacing must be provided for welding insertion of gasket and similar operations in forming joints and connections. 5. Appearance of completed joints must be usually acceptable and match in scale of the completed structure 6. Precast reinforced concrete door and window frames shall be 60 x 100 mm or 70 x 75 mm in cross-section for single shutter door and 60 x 120 mm for double shutter door. 7. The overall sizes (width and height) of the frames shall confirm to the requirements of IS : 4021-1976

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