摘要
以降低温度对混凝土斜圆桩影响,提升稳定性为目的,研究基于软土地基条件下的混凝土斜圆桩密实浇筑技术。采用易搭设的扣件式方管制作模板支撑脚手架,利用新型木塑建筑圆模板,借助Auto CAD精确放样空间几何数据,通过控制模板的裁割角度、支撑架的搭设方式实现斜圆桩的模板支设,结合优化混凝土浇筑工艺,通水冷却混凝土,避免混凝土的因温度过高产生不利的应力致混凝土开裂,有效保证混凝土的施工质量。实验结果表明,该技术浇筑而成的混凝土斜圆桩,达到23 d的龄期后,由温度引起的应变量值很小,桩身混凝土温度变化引起的应变量小于5με;浇筑桩的桩顶荷载的变化不易受混凝土浇筑桩的温度影响;传感光纤所测的应变量值范围处于100~600με之间,且随着荷载的增大而增加,随着深度的加深而减小;桩端阻力和桩侧摩阻力均可以得到充分的发挥,稳定性较强。
In order to reduce the influence of temperature on the concrete inclined round pile and improve the stability,the dense pouring technology of concrete inclined round pile based on soft soil foundation is studied.The formwork support scaffold is made of fastener type square tube which is easy to set up.The new wood plastic building circular formwork is used.With the help of AutoCAD precise lofting spatial geometric data,the formwork support of inclined circular pile is realized by controlling the cutting angle of formwork and the erection method of support frame.Combined with the optimization of concrete pouring process,water is used to cool the concrete,so as to avoid adverse effects of high temperature of concrete The cracking of concrete caused by force can effectively ensure the construction quality of concrete.The experimental results show that,after 23 days of age,the strain caused by temperature is very small,and the strain caused by temperature change of pile body is less than 5;the change of pile top load is not easily affected by the temperature of concrete pouring pile;the range of strain measured by optical fiber sensor is between 100 and 600,and with the increase of load The results show that the pile tip resistance and pile side friction resistance can be fully developed,and the stability is strong.
作者
张小莲
Zhang Xiaolian(The Eleventh Metallurgical Construction Group Co.,Ltd.,Liuzhou Guangxi 545007,China)
出处
《科技通报》
2021年第6期63-68,共6页
Bulletin of Science and Technology
关键词
软土地基
混凝土
斜圆桩
密实浇筑
承载力
温度
soft soil foundation
concrete
inclined round pile
dense pouring
bearing capacity
temperature
