Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Secondary foundation pit supporting structure of underwater bare rock deeply-buried bearing platform and construction method
The invention discloses an underwater bare rock deep-buried bearing platform secondary foundation pit supporting structure and a construction method, and relates to the technical field of bridge construction. The construction method comprises the following steps that after construction of an underwater bridge cast-in-situ bored pile is completed, a cast-in-situ bored pile steel casing is lengthened; corbels are installed on the steel casings, and bottom-layer surrounding purlins, inclined struts, connecting steel pipes and top-layer inclined struts are installed layer by layer; then the top layer surrounding purlins, the bottom layer surrounding purlins and the inclined struts are integrally lowered in place through a hanging system and finish rolling deformed steel bars; inserting and driving a first-stage foundation pit steel sheet pile to a riverbed by a certain depth; pouring a concrete water-stop ring beam after pumping water to a riverbed; excavating rocks to the bottom of the foundation pit by adopting an excavator according to the shape of the bearing platform, and pouring a cushion layer; isolation rubber is installed between the secondary rock wall and the bearing platform, the bearing platform is poured, and two layers of inner supports are arranged to jointly form a primary foundation pit; rock is excavated downwards in the first-stage foundation pit of the steel sheet pile cofferdam to form a second-stage foundation pit, the foundation pit rock wall and isolation rubber are used for replacing a bearing platform steel formwork, and the problem that steel sheet piles of the deep foundation pit cofferdam cannot be driven into the position below the bottom of the foundation pit is solved.
一种水中裸岩深埋承台二级基坑支护结构及施工方法，涉及桥梁施工技术领域，包括以下步骤，水中桥梁钻孔灌注桩施工完成后，接长钻孔灌注桩钢护筒；在钢护筒上安装牛腿，并逐层安装底层围檩及斜撑、连接钢管、顶层斜撑；然后通过吊挂系统及精轧螺纹钢将顶、底层围檩及斜撑整体下放到位；插打一级基坑钢板桩至河床一定深度；抽水到河床后浇筑混凝土止水圈梁；采用挖掘机根据承台形状开挖岩石至基坑底，浇筑垫层；在二级岩石壁与承台间安装隔离橡胶，浇筑承台，本发明设置两层内支撑共同形成一级基坑；在钢板桩围堰一级基坑内向下开挖岩石形成二级基坑，利用基坑岩石壁+隔离橡胶替代承台钢模板，解决了深基坑围堰钢板桩无法打入基坑底以下的难题。
Secondary foundation pit supporting structure of underwater bare rock deeply-buried bearing platform and construction method
The invention discloses an underwater bare rock deep-buried bearing platform secondary foundation pit supporting structure and a construction method, and relates to the technical field of bridge construction. The construction method comprises the following steps that after construction of an underwater bridge cast-in-situ bored pile is completed, a cast-in-situ bored pile steel casing is lengthened; corbels are installed on the steel casings, and bottom-layer surrounding purlins, inclined struts, connecting steel pipes and top-layer inclined struts are installed layer by layer; then the top layer surrounding purlins, the bottom layer surrounding purlins and the inclined struts are integrally lowered in place through a hanging system and finish rolling deformed steel bars; inserting and driving a first-stage foundation pit steel sheet pile to a riverbed by a certain depth; pouring a concrete water-stop ring beam after pumping water to a riverbed; excavating rocks to the bottom of the foundation pit by adopting an excavator according to the shape of the bearing platform, and pouring a cushion layer; isolation rubber is installed between the secondary rock wall and the bearing platform, the bearing platform is poured, and two layers of inner supports are arranged to jointly form a primary foundation pit; rock is excavated downwards in the first-stage foundation pit of the steel sheet pile cofferdam to form a second-stage foundation pit, the foundation pit rock wall and isolation rubber are used for replacing a bearing platform steel formwork, and the problem that steel sheet piles of the deep foundation pit cofferdam cannot be driven into the position below the bottom of the foundation pit is solved.
一种水中裸岩深埋承台二级基坑支护结构及施工方法，涉及桥梁施工技术领域，包括以下步骤，水中桥梁钻孔灌注桩施工完成后，接长钻孔灌注桩钢护筒；在钢护筒上安装牛腿，并逐层安装底层围檩及斜撑、连接钢管、顶层斜撑；然后通过吊挂系统及精轧螺纹钢将顶、底层围檩及斜撑整体下放到位；插打一级基坑钢板桩至河床一定深度；抽水到河床后浇筑混凝土止水圈梁；采用挖掘机根据承台形状开挖岩石至基坑底，浇筑垫层；在二级岩石壁与承台间安装隔离橡胶，浇筑承台，本发明设置两层内支撑共同形成一级基坑；在钢板桩围堰一级基坑内向下开挖岩石形成二级基坑，利用基坑岩石壁+隔离橡胶替代承台钢模板，解决了深基坑围堰钢板桩无法打入基坑底以下的难题。
Secondary foundation pit supporting structure of underwater bare rock deeply-buried bearing platform and construction method
一种水中裸岩深埋承台二级基坑支护结构及施工方法
WANG QINGYUN (Autor:in) / SHANG QINGGUO (Autor:in) / WOO BOK-GON (Autor:in) / LIU KAI (Autor:in) / CHEN RENGUANG (Autor:in) / YANG FENG (Autor:in) / DAN PENGFEI (Autor:in) / LIU FUHAO (Autor:in) / LIN JINDONG (Autor:in)
29.07.2022
Patent
Elektronische Ressource
Chinesisch
IPC:
E02D
FOUNDATIONS
,
Gründungen
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