(การรับน้ำหนักขึ้นอยู่กับสภาพชั้นดินในแต่ละพื้นที่) W3Schools Is optimized for Finding out and training. Examples may be simplified to further improve looking through and Discovering. The steel casing is buried in soil or rock and also the grout is compelled into both equally ends of the casing by making use of a counterweighted drill string.