混凝土灌注桩施工质量的心法十要研究

Research on the Ten Key Points of Construction Quality of Concrete Cast-in-place Pile

研究目的:对于铁路桥涵混凝土灌注桩的施工,由于局部临界软弱土层的坍塌以及影响施工质量的因素预判不准,导致部分灌注桩施工质量不合格,返工处理浪费严重,须采取有效预防措施,确保灌注桩施工质量;由此提出其预防措施的用心统领实施有效方法的十个要点,简称“心法十要”,并对其进行研究。研究结论:(1)心法十要:原材料进场以规定为要;配合比以试验为要;混凝土灌注以控制坍落度为要;软弱地层以控制桩扩径为要;导管位置以控制埋深为要;桩底以控制沉渣厚度为要;桩中以控制混凝土连续为要;桩顶以控制抗压强度为要;完整性检测以最佳处理为要;整个过程以协调为要;(2)心法十要的实施使灌注桩均达合格,可避免返工浪费;(3)本研究成果可为铁路、公路等领域提高混凝土灌注桩施工质量提供参考。

Research purposes:For the construction of concrete cast-in-place pile of railway bridge and culvert,because of the collapse of local critical soft soil layer and the inaccurate prediction of the factors affecting the construction quality,the construction quality of part of cast-in-place pile is not up to standard,and the waste of rework treatment is serious,effective preventive measures must be taken to ensure the construction quality of cast-in-place pile,and ten key points of effective methods are put forward and studied.Research conclusions:(1)The ten key points include:the entry of raw materials should be regulated;the mixture ratio should be tested;concrete pouring is necessary to control the slump;the soft ground should be based on the control of pile expanding;the location of pipe should be based on the control of buried depth;the sediment thickness should be controlled at the bottom of the pile;the concrete continuity should be controlled in the pile;the compressive strength should be controlled at the top of the pile;the integrity test is based on optimal treatment;the whole process is based on the coordination.(2)The implementation of the ten key points makes the cast-in-place piles all up to the standard and avoids the rework waste.(3)The research results can provide reference for improving the construction quality of the cast-in-place concrete pile in the fields of railway and highway.