钻孔灌注扩底桩的施工过程可分为成孔、扩底、清孔、成孔桩四个主要部分。钻孔灌注扩底桩是在灌注桩的基础上,加用相应的扩孔钻头在柱状的底部进行扩孔,形成一个混凝土扩大头来提高桩端承载力,由于它具有施工简便易行,工程费用低和单桩承载力高等优点,日益得到重视。
is one of the pra ctical form of value s. The so-called val ues refers to t he objective t hings are of no val ue a nd the value of fundame ntal perspective. Different values, pe ople' s be haviour, attitudes, ways are different. Pe opl e-oriente d focus on huma n value a nd real ity, we need t he br oadest masses as values. A dhere t o people -ori ented val ues, i s to make the e conomy more dev