6) wall longer than 5m (when the wall thickness at the <120mm, the wall longer than 4m) and there are no cross at the walls or pillars, columns should be added. 7) width is greater than the 2.1M of constructional column of holes on both sides of doors and Windows should be set. 8) door, window top beam shall be provided, the size and reinforcement are shown in tables, the strength of concrete grade C20, shelving on each side of a length not less than 250mm.
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