桩工程施工中常见问题原因分析.rar

桩工程施工
打(压)桩工程施工工序多，工艺要求高，影响桩基质量的因素较多，一般有：
　　  1、工程地质勘察报告不够详尽准确；
　　  2、设计的合理取值；
　　  3、施工中的各种原因。
　　在桩基施工中对质量问题及隐患的分析与处理，将影响建筑物的结构安全。本文重点介绍打(压)桩施工中常见质量问题的类别、原因分析、常用处理方法。
常见质量问题类别及原因分析
    打(压)桩工程常见质量问题有：单桩承载力低于设计值，桩倾斜过大、断桩、桩接头断离、桩位偏差过大等五大类。造成以上问题的原因：
 1.1单桩承载力低于设计要求的常见原因有：
      1.1.1桩沉入深度不足；
      1.1.2桩端未进入设计规定的持力层，但桩深已达设计值；
      1.1.3最终贯入度过大；
      1.1.4其他，诸如桩倾斜过大、断裂等原因导致
Piles
Call (pressure) pile construction process more demanding process, many factors affect the quality of pile foundation generally are:
1, engineering geological investigation report is not exhaustive and accurate;
2, reasonable values of the design;
3, the construction of a variety of reasons.
Pile Foundation Construction in quality problems and hidden dangers on the analysis and processing, will affect the structural safety of buildings. This article focuses on call (pressure) Pile types of common quality problems, cause analysis, commonly used approach.
Common types and causes of quality problems
    Call (pressure) piles quality problems are: lower than the design value of bearing capacity, piles too large, broken piles, joint rupture, excessive deviation Pile five major categories. The reasons for the above problems:
 1.1 lower than the design bearing capacity of the common reasons:
      1.1.1 piles sunk deep enough;
      1.1.2 Design of pile is not required to enter the bearing layer, but deep pile has reached the design value;
      1.1.3 Penetration through the large end;
      1.1.4 Others, such as piles too large, breakage and other causes