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Coarse sand geology slurry retaining wall rotary excavating cast-in-situ bored pile construction method
The invention discloses a coarse sand geology slurry retaining wall rotary excavating cast-in-situ bored pile construction method which comprises the following steps: S1, after a construction site is leveled, surveying and setting out are carried out, the specific position of a pile is determined, and a pile casing is buried; s2, slurry protection walls are adopted for drilling, slurry needs to be prepared before construction, and mixed slurry protection walls for coarse sand geology comprise, by weight, 110-130 kg/m < 3 > of bentonite, 3-5 kg/m < 3 > of sodium carbonate, 1.10-1.30 kg/m < 3 > of ionic cellulose and 900-1100 kg/m < 3 > of water; and S3, soil cutting, drill lifting and soil throwing are conducted through rotation of the drilling bucket. The wall protecting slurry is prepared from high-quality bentonite, sodium carbonate and ionic cellulose, so that the ratio of the slurry is optimized, and the pore-forming wall protecting effect of the cast-in-situ bored pile in the sand layer geology is effectively ensured. A rotary drilling rig is adopted for hole forming, the soil lifting speed of a drilling bucket and the lifting speed of an empty drilling bucket are controlled, the lifting speed is correspondingly reduced along with increase of the drilling depth, a drill bit conducts vertical reciprocating operation multiple times after hole forming, and it is guaranteed that the hole diameter meets the requirement and the slurry retaining wall is stable.
本发明公开了一种粗砂地质泥浆护壁旋挖钻孔灌注桩施工方法，包括以下步骤：S1、对施工场地进行平整后进行测量放线，确定桩的具体位置，埋设护筒；S2、钻孔采用泥浆护壁，在施工前需制备泥浆，针对粗砂地质混合泥浆护壁掺量为膨润土：110～130kg/m3、纯碱：3～5kg/m3、离子纤维素：1.10～1.30kg/m3、水：900～1100kg/m3；S3、通过钻斗的旋转、削土、提钻、甩土。采用优质膨润土+纯碱+离子纤维素制作护壁泥浆，优化泥浆配比，有效保证了砂层地质钻孔灌注桩成孔护壁效果。采用旋挖钻机成孔，控制钻斗提土速度和空钻斗升降速度，随着钻孔深度的增加，其升降速度相应减小，成孔后钻头多次上下往复作业，保证了孔径满足要求及泥浆护壁稳定。
Coarse sand geology slurry retaining wall rotary excavating cast-in-situ bored pile construction method
The invention discloses a coarse sand geology slurry retaining wall rotary excavating cast-in-situ bored pile construction method which comprises the following steps: S1, after a construction site is leveled, surveying and setting out are carried out, the specific position of a pile is determined, and a pile casing is buried; s2, slurry protection walls are adopted for drilling, slurry needs to be prepared before construction, and mixed slurry protection walls for coarse sand geology comprise, by weight, 110-130 kg/m < 3 > of bentonite, 3-5 kg/m < 3 > of sodium carbonate, 1.10-1.30 kg/m < 3 > of ionic cellulose and 900-1100 kg/m < 3 > of water; and S3, soil cutting, drill lifting and soil throwing are conducted through rotation of the drilling bucket. The wall protecting slurry is prepared from high-quality bentonite, sodium carbonate and ionic cellulose, so that the ratio of the slurry is optimized, and the pore-forming wall protecting effect of the cast-in-situ bored pile in the sand layer geology is effectively ensured. A rotary drilling rig is adopted for hole forming, the soil lifting speed of a drilling bucket and the lifting speed of an empty drilling bucket are controlled, the lifting speed is correspondingly reduced along with increase of the drilling depth, a drill bit conducts vertical reciprocating operation multiple times after hole forming, and it is guaranteed that the hole diameter meets the requirement and the slurry retaining wall is stable.
本发明公开了一种粗砂地质泥浆护壁旋挖钻孔灌注桩施工方法，包括以下步骤：S1、对施工场地进行平整后进行测量放线，确定桩的具体位置，埋设护筒；S2、钻孔采用泥浆护壁，在施工前需制备泥浆，针对粗砂地质混合泥浆护壁掺量为膨润土：110～130kg/m3、纯碱：3～5kg/m3、离子纤维素：1.10～1.30kg/m3、水：900～1100kg/m3；S3、通过钻斗的旋转、削土、提钻、甩土。采用优质膨润土+纯碱+离子纤维素制作护壁泥浆，优化泥浆配比，有效保证了砂层地质钻孔灌注桩成孔护壁效果。采用旋挖钻机成孔，控制钻斗提土速度和空钻斗升降速度，随着钻孔深度的增加，其升降速度相应减小，成孔后钻头多次上下往复作业，保证了孔径满足要求及泥浆护壁稳定。
Coarse sand geology slurry retaining wall rotary excavating cast-in-situ bored pile construction method
一种粗砂地质泥浆护壁旋挖钻孔灌注桩施工方法
QI WEI (author) / HU HONGLIANG (author) / LI JIE (author) / YAO SHANGWEI (author) / ZHOU QI (author) / XU JUNSHAN (author) / CHEN SHENYAN (author)
2024-09-17
Patent
Electronic Resource
Chinese
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