Mixed pile forming method for high-bearing one-stage club-footed pile

高承载能力的一级扩底桩的混合成桩方法

Abstract

The present invention relates to construction of building pile foundation engineering, and is especially mixed piling process of one-stage under-reamed pile with great bearing capacity. The extrusion piling process includes the following steps: erecting prefabricated reinforced concrete immersed pile head on ground, pressing immersed tube onto the reinforced concrete pile head, immersing the immersed tube into hardpan to design elevation, drawing upwards the immersed tube to designed distance, forming base space and taking out soil, pouring the base with concrete, setting the prefabricated pile stem with steel dowels in the lower end, withdrawing the immersed tube and injecting cement mortar to around the pile stem. The pile has the ratio between the base diameter and the pile stem diameter as great as 5-6, deduction coefficient up to 0.9-1.0, high material strength utilizing rate, great bearing capacity and other advantages.
本发明涉及一种建筑桩基工程的施工方法,特别是一种高承载能力的一级扩底桩的混合成桩方法。高承载能力的一级扩底桩的混合成桩方法,包括如下工艺步骤:a.把预制沉管钢砼桩头竖直立于地面上备用;b.把沉管套压在钢砼桩头上面;c.沉管沉入硬土层至设计标高;d.上拔沉管至设定距离H;e.加工底座空间,取净碎土;f.灌注砼浇注底座;g、放入下端具有插筋的预制桩身;h、拔出沉管,向桩身外缝隙注入水泥浆。本发明底座直径与桩身直径比值大可达5-6,折减系数达0.9-1.0,充分发挥材料强度的利用率、单桩的承载能力大,安全可靠等优点和积极效果;工艺合理,实施容易。

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