基础设计施工中易忽视的几个问题

• 作 者: 刘敦辉
• 机 构: 惠州市建筑学校设计室 广东省惠州市班樟湖路22号 516027
• 出 处: 建筑知识
• 发表日期: 1997年03期
• 关键词: 基础设计 成孔灌注桩 中易 地基持力层 垫层 面积计算 锅底形 基础底板 单独基础 底板钢筋

一、桩基础 1.桩底构造。在现浇大直径人工成孔灌注桩设计中,往往将桩底设计成锅底形状,这样可以增大桩与地基持力层的接触面。经计算,可提高承载力约4％～9％,但实际上是难以得到保证的。因为桩的深度一般较大(从十余米到几十米),由于井底环境差,即便是逐个检查也难以查验准确。所以设计时不宜按锅底形面积计算,而将其作为安全

First, pile foundation 1. Pile bottom structure. In the design of cast-in-place large-diameter artificial bored piles, the pile bottom is often designed as a bottom shape, which can increase the contact surface between the pile and the foundation bearing layer. After calculation, the bearing capacity can be increased by about 4% to 9%, but it is actually difficult to guarantee. Because the depth of the pile is generally large (from ten to several tens of meters), due to the poor bottom hole environment, it is difficult to inspect even one by one. Therefore, it is not appropriate to design the pot bottom area as a safety measure.