中鐵十局粉噴樁技術交底.doc
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交底內容：
1. 本處理地段粉噴樁樁徑Ф500mm（攪拌鉆頭不小于Ф500mm），采用42.5級普通硅酸鹽水泥。每加固1m土體摻入水泥量為55kg，單位樁長水泥用量的負值偏差應控制在8%以內，單樁水泥用量負值偏差應控制在5%以內。
2. 采用兩噴四攪法施工，自上而下攪拌，自下而上噴粉攪拌，攪拌頭上提噴分時的提升速度為0.5~1m/min。為保證粉體攪拌均勻，須進行全樁長復攪，復攪速度也應控制在0.5~1m/min，為保證樁底噴灰量據管道的送灰時間，提升鉆具前提前噴灰，不充許先提升鉆具后噴灰，停灰面為施工地面下0.5m處，復攪時管道壓力不宜過大，以不堵塞出氣孔為原則，防止鉆孔淤泥向四周擠壓形成空洞。
3. 測放樁位按設計要求進行，在確定孔位時，需經復核確認后方可進入下一施工工序，為保證樁位的準確性，樁位必須打入木樁或插入竹片作為樁位標記。
4. 下鉆桿時，先使樁機安置在標定的孔位上，使鉆頭中心對準孔中心，桿位偏差在±5cm以內，調整樁機水平度及垂直度，保證孔斜率不大于1.5%，終孔后校正鉆具，樁徑偏差不得大于4%。
5. 下鉆桿攪拌前要通過地面試噴清水，檢查噴粉設備和管路系統、設備的壓力和排量必須滿足設計要求；管路系統的密封圈必須良好，各通道和噴嘴內不得有雜物。
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Cards on the table contents:
1. The processing site DJM pile diameter Ф500mm (mixing drill not less than Ф500mm), with 42.5 ordinary portland cement. Strengthening 1m per volume of soil mixed with cement 55kg, unit pile length of the negative deviation of cement content should be controlled within 8%, a negative deviation of single pile of cement consumption should be controlled within 5%.
2. Using two four-jet mixing method construction, top-down mixing, bottom-up powder mixing, spray mixing head to mention time-enhancement rate 0.5 ~ 1m/min. Stir to ensure powder, to carry out the whole pile length complex mix, complex mixing speed should be controlled at 0.5 ~ 1m/min, to ensure the spray pile ash gray, according to time of delivery channels to enhance the drill in advance of spraying dust, and not allow drilling to upgrade after the first spray gray, stop gray-0.5m below ground for the construction of office, complex mix when the pressure pipe should not be too big to not plug the pores in principle, to prevent the drilling mud to form a cavity around the extrusion.
3. Measuring Pile up by design requirements, in determining the hole, the need to be confirmed by the review into the next construction process, in order to ensure the accuracy of the Pile, Pile must be inserted into the stakes or bamboo as the pile bit tag.
4. Under the drill, the first to pile driver placed in the calibration of the holes, so that the drill center hole aligned center pole position deviation within ± 5cm to adjust the level of degree and verticality of pile driver, to ensure the slope is not greater than hole 1.5%, after the correction of the final hole drilling, pile diameter deviation of not more than 4%.
5. Stirring before the next drill pipe to the interview by spraying water, check the spray equipment and piping systems, equipment, pressure and displacement to meet the design requirements; piping system must have good seal, the channel and nozzle shall not have debris.
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