ท่อน้ำฝน - An Overview
Use picket stakes and Mason’s line or chalk line to produce a sq. or rectangular form across the marked area. Ensure that the formwork is stage and protected. When creating the formwork, make allowance for the slope to the middle with the drain.จังหวัดประจวบคีรีขันธ์ (อำเภอทับสะแ