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一次爆扩成孔桩是进行孔底一次爆扩,造成扩大头来增加承载力、抗冻拔力的施工方法。在爆破过程中孔壁被压实和形成裂缝,浇筑混凝土后布满仙人掌式片与周边接触,增加摩擦阻力,扩大头为大放脚且底部呈球面支承的特点。一次爆扩成孔桩达到了降低成本30％,缩短工期40—50％,节省劳力60％,回填土方量
A blasting expansion of a hole pile is a construction method in which the bottom of the hole is explosion-expanded, resulting in an increase of the head to increase the bearing capacity and the resistance to freeze-out forces. During the blasting process, the wall of the hole is compacted and cracks are formed. After the concrete is poured, the cactus-like pieces are placed in contact with the periphery to increase the frictional resistance, and the head is enlarged and the bottom is spherically supported. One burst of expanded hole piles achieves a cost reduction of 30%, a 40 to 50% reduction in the construction period, a saving of 60% of labor, and backfilling of earthwork.