粉體噴射攪拌樁施工方法.doc

粉體噴射攪拌樁施工
A． 施工方法
a. 恢復(fù)中線，放出施工路段邊線樁，清理平整原地基使之滿足粉噴攪拌樁現(xiàn)場施工要求。
b. 測量繪制方格網(wǎng)圖，準確定出樁位，其偏差不應(yīng)超過設(shè)計規(guī)定。
c. 標定輸灰泵的輸灰量，灰粉到達噴灰口的時間，預(yù)攪下沉速度，噴灰攪拌提升速度，重復(fù)攪拌下沉速度，重攪拌提升速度等施工參數(shù)，并進行試樁，使其強度達到設(shè)計要求。
d. 樁機，設(shè)備安裝就位，調(diào)好平整度及導(dǎo)向架的垂直度，使粉體噴射攪拌樁的垂直度符合設(shè)計要求。
e. 攪拌機預(yù)攪下沉，下沉過程中一般不沖水，如遇堅硬土層必須適量沖水時，要報經(jīng)監(jiān)理工程師批準，并考慮沖水對樁身強度的影響。
f. 預(yù)攪下沉至設(shè)計深度后，起動輸灰泵，將符合質(zhì)量要求的固化材料（水泥或石灰），按設(shè)計用量、次數(shù)、速度，在規(guī)定深度，經(jīng)噴灰口邊續(xù)噴射，攪拌機械連續(xù)攪拌，并提升至距地面0.5m處。
g. 重復(fù)攪拌下沉至樁底，再重復(fù)攪拌提升至距地面0.5m，最后用水泥土回填樁頭，并壓實養(yǎng)護。
設(shè)專人記錄泵送固化材料的時間，
Powder injection pile construction
A. Construction Method
a. recovery center line, construction of road sideline release pile, clean flat ground so as to meet the original powder jet mixing on-site construction requirements.
b. Survey mapping grid map, accurately set the pile position, the deviation should not exceed the design requirements.
c. calibration pump Ash Ash content, ash gray spray time of arrival, pre-mix sinking speed, increase speed jet ash mixing, stirring repeated sinking speed, re-mixing to enhance the speed of construction parameters, and test pile , its strength to meet the design requirements.
d. Pile Driver, equipment installation in place, adjusted the guide frame smoothness and verticality, so that powder injection pile of verticality of the design requirements.
e. pre-mixing sink mixer, sink process generally does not flush in case of hard soil to flush when appropriate, to report to the supervising engineer for approval and consider the impact of flushing of the shaft strength.
f. pre-mix to the designed depth of sinking, the starting Ash pump, will meet the quality requirements of the curing material (cement or lime), according to design dosage, frequency, speed, depth specified by the spray of gray side continued injection, mixing continuous mechanical stirring, and raised to 0.5m from the ground office.
g. Repeat mixing pile sinking to the bottom, and then repeat the stirring increased to from the ground 0.5m, the final backfill soil water trailer coupling, and Compaction.
Hand pump set record time of curing materials,

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