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Construction method of deepwater soft rock low pile cap locking steel pipe pile cofferdam
The invention provides a construction method for a deepwater soft rock low pile cap locking steel pipe pile cofferdam. The construction method comprises the following steps that S1, a pile foundation construction platform is dismantled; s2, pile insertion positioning is carried out with one of the upstream angular point piles as a first pile, S3, second-round pile sinking is carried out one by one according to the steel pipe pile construction sequence, and hole guiding and reaming are carried out on the rock stratum in the piles in the second-round pile sinking till the preset elevation is reached; s4, steel enclosing purlins and steel supports which are located above the water surface are installed on the inner sides of the steel pipe piles; and S5, water is pumped to the riverbed surface, a covering layer in the cofferdam is cleaned, then a weathered rock stratum foundation pit of the bearing platform is excavated, and bearing platform steel bar binding and concrete pouring are conducted. Every two adjacent steel pipe piles are mutually locked, the structural rigidity is improved, and construction under the deepwater condition is met. Disturbance to original rock is reduced by adopting a mode of leading holes and reaming in the enclosure steel pipe pile pipe, the water stopping performance of one-time forming of the cofferdam is improved, and the cost of auxiliary water stopping measures and the construction period investment are reduced.
本发明提供一种深水软岩低桩承台锁口钢管桩围堰施工方法，包括以下步骤：步骤S1，拆除桩基施工平台；步骤S2，以上游的其中一个角点桩为首桩进行插桩定位，步骤S3，按照钢管桩施工顺序逐一进行第二轮沉桩，第二轮沉桩在桩内对岩层引孔、扩孔至预设标高；步骤S4，在钢管桩内侧安装位于水面之上的钢围檩和钢支撑，步骤S5，抽水至河床面清理围堰内部覆盖层后进行承台的风化岩层基坑开挖，进行承台钢筋绑扎及混凝土灌注。相邻两个钢管桩相互锁扣，提高结构刚度，以满足深水条件施工；采用围护钢管桩管内引孔、扩孔的方式减少对原岩的扰动，提高围堰一次成型的止水性能，减少辅助止水措施的成本及工期投入。
Construction method of deepwater soft rock low pile cap locking steel pipe pile cofferdam
The invention provides a construction method for a deepwater soft rock low pile cap locking steel pipe pile cofferdam. The construction method comprises the following steps that S1, a pile foundation construction platform is dismantled; s2, pile insertion positioning is carried out with one of the upstream angular point piles as a first pile, S3, second-round pile sinking is carried out one by one according to the steel pipe pile construction sequence, and hole guiding and reaming are carried out on the rock stratum in the piles in the second-round pile sinking till the preset elevation is reached; s4, steel enclosing purlins and steel supports which are located above the water surface are installed on the inner sides of the steel pipe piles; and S5, water is pumped to the riverbed surface, a covering layer in the cofferdam is cleaned, then a weathered rock stratum foundation pit of the bearing platform is excavated, and bearing platform steel bar binding and concrete pouring are conducted. Every two adjacent steel pipe piles are mutually locked, the structural rigidity is improved, and construction under the deepwater condition is met. Disturbance to original rock is reduced by adopting a mode of leading holes and reaming in the enclosure steel pipe pile pipe, the water stopping performance of one-time forming of the cofferdam is improved, and the cost of auxiliary water stopping measures and the construction period investment are reduced.
本发明提供一种深水软岩低桩承台锁口钢管桩围堰施工方法，包括以下步骤：步骤S1，拆除桩基施工平台；步骤S2，以上游的其中一个角点桩为首桩进行插桩定位，步骤S3，按照钢管桩施工顺序逐一进行第二轮沉桩，第二轮沉桩在桩内对岩层引孔、扩孔至预设标高；步骤S4，在钢管桩内侧安装位于水面之上的钢围檩和钢支撑，步骤S5，抽水至河床面清理围堰内部覆盖层后进行承台的风化岩层基坑开挖，进行承台钢筋绑扎及混凝土灌注。相邻两个钢管桩相互锁扣，提高结构刚度，以满足深水条件施工；采用围护钢管桩管内引孔、扩孔的方式减少对原岩的扰动，提高围堰一次成型的止水性能，减少辅助止水措施的成本及工期投入。
Construction method of deepwater soft rock low pile cap locking steel pipe pile cofferdam
一种深水软岩低桩承台锁口钢管桩围堰施工方法
TAI HUASONG (author) / LI CHANG (author) / ZHANG XIANGMING (author) / GAO LIQIAN (author) / CHANG CONGHUI (author) / SUN WENZHI (author) / LIN FENG (author) / GUO JINLONG (author) / LI QIAN (author) / ZHU JIANHUA (author)
2023-11-07
Patent
Electronic Resource
Chinese
IPC:
E02D
FOUNDATIONS
,
Gründungen
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