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Rotary excavating cast-in-place pile construction process under strong corrosive soft geological condition in coastal region
The invention discloses a rotary excavating cast-in-place pile construction process under a strong corrosive soft geological condition in a coastal region. The rotary excavating cast-in-place pile construction process comprises the following steps of field area replacement and filling, advanced drilling, positioning and paying off, pile foundation in-place arrangement, pile casing burying, drilling machine drilling, pile casing welding and burying, hole cleaning, reinforcement cage hoisting and placing, secondary hole cleaning, concrete pouring and post-grouting. According to the method, a high-sulfur-resistance concrete construction technology is introduced, so erosion of an underground strong corrosive environment to a pile body is effectively resisted; a steel casing pore-forming process is introduced, so the problem that a mud protection wall cannot be adopted in a muddy soil layer is effectively solved; a rotary excavating cast-in-place pile construction process is adopted, so theproblem that a precast pile is not suitable for being used under the strong corrosive geological condition is effectively solved; a steel casing pore-forming process is adopted, so the concrete forming quality of the pile body is remarkably improved, and the pile body quality problems of hole collapse, necking and the like can be effectively reduced or lowered; and high-sulfur-resistance anti-corrosion concrete is adopted for construction, special foundation treatment is no longer needed, the construction period is effectively shortened, and the construction cost is reduced.
本发明公开了滨海地区强腐蚀性软弱地质条件下的旋挖灌注桩施工工艺，包括以下步骤：场区换填、超前钻、定位放线、桩基就位、埋设护筒、钻机钻进、护筒焊接及埋设、清孔、吊放钢筋笼、二次清孔、砼浇筑和后注浆。本发明引入高抗硫混凝土施工技术，有效抵御地下强腐蚀性环境对桩身的侵蚀；引入钢护筒成孔工艺，有效解决淤泥质土层无法采用泥浆护壁的问题；采用旋挖灌注桩施工工艺，有效解决强腐蚀性地质条件下不宜使用预制桩的问题；采用的钢护筒成孔工艺，对桩身混凝土成型质量具有显著的提升作用，可有效减少或降低塌孔、缩颈等桩身质量问题；采用高抗硫防腐混凝土施工，可不再进行专门的地基处理，有效缩减工期并减低施工成本。
Rotary excavating cast-in-place pile construction process under strong corrosive soft geological condition in coastal region
The invention discloses a rotary excavating cast-in-place pile construction process under a strong corrosive soft geological condition in a coastal region. The rotary excavating cast-in-place pile construction process comprises the following steps of field area replacement and filling, advanced drilling, positioning and paying off, pile foundation in-place arrangement, pile casing burying, drilling machine drilling, pile casing welding and burying, hole cleaning, reinforcement cage hoisting and placing, secondary hole cleaning, concrete pouring and post-grouting. According to the method, a high-sulfur-resistance concrete construction technology is introduced, so erosion of an underground strong corrosive environment to a pile body is effectively resisted; a steel casing pore-forming process is introduced, so the problem that a mud protection wall cannot be adopted in a muddy soil layer is effectively solved; a rotary excavating cast-in-place pile construction process is adopted, so theproblem that a precast pile is not suitable for being used under the strong corrosive geological condition is effectively solved; a steel casing pore-forming process is adopted, so the concrete forming quality of the pile body is remarkably improved, and the pile body quality problems of hole collapse, necking and the like can be effectively reduced or lowered; and high-sulfur-resistance anti-corrosion concrete is adopted for construction, special foundation treatment is no longer needed, the construction period is effectively shortened, and the construction cost is reduced.
本发明公开了滨海地区强腐蚀性软弱地质条件下的旋挖灌注桩施工工艺，包括以下步骤：场区换填、超前钻、定位放线、桩基就位、埋设护筒、钻机钻进、护筒焊接及埋设、清孔、吊放钢筋笼、二次清孔、砼浇筑和后注浆。本发明引入高抗硫混凝土施工技术，有效抵御地下强腐蚀性环境对桩身的侵蚀；引入钢护筒成孔工艺，有效解决淤泥质土层无法采用泥浆护壁的问题；采用旋挖灌注桩施工工艺，有效解决强腐蚀性地质条件下不宜使用预制桩的问题；采用的钢护筒成孔工艺，对桩身混凝土成型质量具有显著的提升作用，可有效减少或降低塌孔、缩颈等桩身质量问题；采用高抗硫防腐混凝土施工，可不再进行专门的地基处理，有效缩减工期并减低施工成本。
Rotary excavating cast-in-place pile construction process under strong corrosive soft geological condition in coastal region
滨海地区强腐蚀性软弱地质条件下的旋挖灌注桩施工工艺
SUN FENGYAN (author) / CHEN BIN (author)
2021-03-12
Patent
Electronic Resource
Chinese
IPC:
E02D
FOUNDATIONS
,
Gründungen
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