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1.多支盘桩多支盘桩是一种新型灌注桩,其施工方法如下:首先,用普通旋挖钻机钻斗根据设计图纸要求在土体上旋挖出圆柱桩桩孔;其次,在旋挖钻机上安装挤扩装置,在圆柱桩桩孔的基础上挤扩出多节盘形空腔;最后,置入钢筋笼、灌注混凝土,形成多支盘桩。多支盘桩将圆柱桩对土体的侧面摩擦阻力,改变为侧面摩擦阻力加多支盘承载力的受力结构,增强了承载能力。圆柱桩与多支盘桩对比如图1所示。理论研究和实践表明,多支盘桩具有受力机理明确、受载荷后沉降小、抗振性能好、地层适应性强等特点。
1. Multi-branch pile Multi-branch pile is a new type of pile, the construction method is as follows: First, the ordinary rotary drilling rig drilling bucket in accordance with the requirements of the drawings in the soil dredging cylindrical pile hole; Second, in the Spiral drilling rig installed crowded expansion device, in the cylindrical pile hole on the basis of crowded out multi-section disc-shaped cavity; Finally, into the steel cage, pouring concrete, the formation of multi-branch pile. Multi-branch pile will be cylindrical pile on the side of the soil frictional resistance, lateral frictional resistance plus multi-disc bearing capacity of the force structure, and enhance the carrying capacity. Cylindrical pile and multi-branch pile contrast shown in Figure 1. Theoretical research and practice show that the multi-branch pile has the characteristics of stress mechanism, small settlement after loading, good anti-vibration performance and strong strata adaptability.