粉体喷射搅拌桩施工方法.doc
粉体喷射搅拌桩施工
A. 施工方法
a. 恢复中线,放出施工路段边线桩,清理平整原地基使之满足粉喷搅拌桩现场施工要求。
b. 测量绘制方格网图,准确定出桩位,其偏差不应超过设计规定。
c. 标定输灰泵的输灰量,灰粉到达喷灰口的时间,预搅下沉速度,喷灰搅拌提升速度,重复搅拌下沉速度,重搅拌提升速度等施工参数,并进行试桩,使其强度达到设计要求。
d. 桩机,设备安装就位,调好平整度及导向架的垂直度,使粉体喷射搅拌桩的垂直度符合设计要求。
e. 搅拌机预搅下沉,下沉过程中一般不冲水,如遇坚硬土层必须适量冲水时,要报经监理工程师批准,并考虑冲水对桩身强度的影响。
f. 预搅下沉至设计深度后,起动输灰泵,将符合质量要求的固化材料(水泥或石灰),按设计用量、次数、速度,在规定深度,经喷灰口边续喷射,搅拌机械连续搅拌,并提升至距地面0.5m处。
g. 重复搅拌下沉至桩底,再重复搅拌提升至距地面0.5m,最后用水泥土回填桩头,并压实养护。
设专人记录泵送固化材料的时间,
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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