Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Construction method for multi-layer super-large karst cave socketed pile foundation in complex karst area
The invention relates to a construction method for a multi-layer super-large karst cave socketed pile foundation in a complex karst area. The construction method comprises the specific steps that S1, a site is leveled, pile position lofting is carried out, and hole calibration operation is continuously carried out; s2, the steel casing is in place, the steel casing comprises a working steel casing body and an inner casing body, the working steel casing body is lowered to the rock surface through a vibratory hammer and a centralizer, and slag salvaging and soil taking are conducted on an overburden layer through a slag salvaging hopper; s3, a rotary excavating drill is matched with a roller bit in place, drilling and hole forming are graded according to the distribution layer number of the karst cave, graded drilling and hole expanding are conducted to the bottom of the karst cave, and under the assistance of a vibratory hammer and a centralizer, an inner pile casing follows up; and judging whether the bottom rock surface of the lowest karst cave is reached or not, if not, continuing graded drilling, and if yes, carrying out graded drilling to the designed hole bottom elevation, and finishing the hole. According to the method, the construction method of'graded drilling and full pile casing follow-up 'of the rotary drilling is adopted, the collapse risk of the karst cave is reduced, and the hole forming efficiency and quality are improved.
本发明是一种复杂岩溶地区多层超大溶洞嵌岩桩基础施工方法，具体步骤为：S1、场地整平，桩位放样，不断的进行校孔作业；S2、钢护筒就位，钢护筒包括工作钢护筒和内护筒，利用振动锤及导正器，下放工作钢护筒至岩面，覆土层采用捞渣斗捞渣、取土；S3、旋挖钻配牙轮钻头就位，钻进成孔按照溶洞分布层数分级，分级钻进、扩孔至溶洞底，在振动锤及导正器的辅助下，内护筒跟进；判断是否到达最下层溶洞底岩面，如果否，继续分级钻进，如果是，则分级钻进至设计孔底标高，终孔。本发明针采用旋挖钻“分级钻孔，全护筒跟进”施工方法，降低了溶洞坍塌风险，提高了成孔效率和质量。
Construction method for multi-layer super-large karst cave socketed pile foundation in complex karst area
The invention relates to a construction method for a multi-layer super-large karst cave socketed pile foundation in a complex karst area. The construction method comprises the specific steps that S1, a site is leveled, pile position lofting is carried out, and hole calibration operation is continuously carried out; s2, the steel casing is in place, the steel casing comprises a working steel casing body and an inner casing body, the working steel casing body is lowered to the rock surface through a vibratory hammer and a centralizer, and slag salvaging and soil taking are conducted on an overburden layer through a slag salvaging hopper; s3, a rotary excavating drill is matched with a roller bit in place, drilling and hole forming are graded according to the distribution layer number of the karst cave, graded drilling and hole expanding are conducted to the bottom of the karst cave, and under the assistance of a vibratory hammer and a centralizer, an inner pile casing follows up; and judging whether the bottom rock surface of the lowest karst cave is reached or not, if not, continuing graded drilling, and if yes, carrying out graded drilling to the designed hole bottom elevation, and finishing the hole. According to the method, the construction method of'graded drilling and full pile casing follow-up 'of the rotary drilling is adopted, the collapse risk of the karst cave is reduced, and the hole forming efficiency and quality are improved.
本发明是一种复杂岩溶地区多层超大溶洞嵌岩桩基础施工方法，具体步骤为：S1、场地整平，桩位放样，不断的进行校孔作业；S2、钢护筒就位，钢护筒包括工作钢护筒和内护筒，利用振动锤及导正器，下放工作钢护筒至岩面，覆土层采用捞渣斗捞渣、取土；S3、旋挖钻配牙轮钻头就位，钻进成孔按照溶洞分布层数分级，分级钻进、扩孔至溶洞底，在振动锤及导正器的辅助下，内护筒跟进；判断是否到达最下层溶洞底岩面，如果否，继续分级钻进，如果是，则分级钻进至设计孔底标高，终孔。本发明针采用旋挖钻“分级钻孔，全护筒跟进”施工方法，降低了溶洞坍塌风险，提高了成孔效率和质量。
Construction method for multi-layer super-large karst cave socketed pile foundation in complex karst area
一种复杂岩溶地区多层超大溶洞嵌岩桩基础施工方法
LI JUAN (Autor:in) / YU LIU (Autor:in) / JI ZHONGYUAN (Autor:in)
30.05.2023
Patent
Elektronische Ressource
Chinesisch
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