桩基工程中,钢筋混凝土预制桩的型式颇多。就其横截面而言,有圆形、方形、三角形、十字形、多角形等多种形状。就其整体形状而言,有等截面桩、阶梯形桩、锥形桩和板桩等型式。钢筋混凝土预制桩贯入地基土层的方法有锤击、振动、静压和射水等。锤击法由来甚久,应用普遍,有其独到之处。但其对施工现场周围的干扰较大,对接近旧有建筑物基础和不允许有噪音的地方不宜采用。静压法最大的特点是避免了锤击法的不足之处。但是静 In pile foundation engineering, there are many types of reinforced concrete precast piles. In terms of its cross-section, it has various shapes such as a circle, a square, a triangle, a cross, and a polygon. In terms of its overall shape, there are types such as equal-section piles, stepped piles, tapered piles, and sheet piles. The method of penetrating into the foundation soil of reinforced concrete precast piles includes hammering, vibration, static pressure and water jet. Hammering method originated for a long time, applied widely, and has its own uniqueness. However, it has a great deal of interference with the construction site and should not be used in places close to old buildings and where no noise is allowed. The biggest feature of the static pressure method is to avoid the deficiencies of the hammering method. But quiet