12泥浆护壁回转钻孔灌注桩工程.doc

一、 施工准备
（一） 作业条件
1、 地上、地下障碍物都处理完毕，达到“三通一平”。施工用的临时设施准备就绪。
2、 场地标高一般为承台梁的上皮标高，并已经过夯实或碾压。
3、 制作好钢筋笼。
4、 根据放出的轴线及桩位点，抄上水平标高木橛，井经过验收签字。
5、 选择和确定钻孔机的进出路线和钻孔顺序，制定施工方案。
6、 正式施工前要做成孔试验，数量不少于2根。
（二） 材料要求
1、 水泥：根据设计要求确定水泥品种、强度等级。
2、 砂：中砂或粗砂，含泥量不大于5%。
3、 石子：粒径为0.5～3.2cm的卵石或碎石，含泥量不大于2%。
4、 水：使用自来水或不含有害物质的洁净水。
5、 粘土：可就地选择塑性指数Ip≥17的粘土。
6、 外加早强剂通过试验确定。
7、 钢筋：钢筋的品种、级别

First, construction preparation
(A) Operating conditions
1, on the ground, underground obstructions are dealt with, to "leveling." Construction of temporary facilities ready for use.
2, site elevation is generally Beam of the epithelial height, and has been compacted or compacted.
3, production of good steel cage.
4, according to the axis and pile release site, copied on the level of standard Takagi chunks, well through the acceptance signature.
5, selection, and determine the line of drilling machines and drilling out of order, and the construction project.
6, made before the formal construction of test holes, the number of not less than two.
(B) material requirements
1 cement: cement varieties according to design requirements, the intensity level.
2, sand: the sand or coarse sand, mud content less than 5%.
3 stones: diameter 0.5 ~ 3.2cm of gravel or crushed stone, mud content is less than 2%.
4, Water: tap water or clean water free of harmful substances.
5, Clay: may choose the plasticity index Ip ≥ 17 of the clay.
6, plus early strength agent determined by experiments.
7, RC: reinforced varieties, level