12泥漿護壁回轉鉆孔灌注樁工程.doc

一、 施工準備
（一） 作業條件
1、 地上、地下障礙物都處理完畢，達到“三通一平”。施工用的臨時設施準備就緒。
2、 場地標高一般為承臺梁的上皮標高，并已經過夯實或碾壓。
3、 制作好鋼筋籠。
4、 根據放出的軸線及樁位點，抄上水平標高木橛，井經過驗收簽字。
5、 選擇和確定鉆孔機的進出路線和鉆孔順序，制定施工方案。
6、 正式施工前要做成孔試驗，數量不少于2根。
（二） 材料要求
1、 水泥：根據設計要求確定水泥品種、強度等級。
2、 砂：中砂或粗砂，含泥量不大于5%。
3、 石子：粒徑為0.5～3.2cm的卵石或碎石，含泥量不大于2%。
4、 水：使用自來水或不含有害物質的潔凈水。
5、 粘土：可就地選擇塑性指數Ip≥17的粘土。
6、 外加早強劑通過試驗確定。
7、 鋼筋：鋼筋的品種、級別

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

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