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Underpinning construction method for underground excavation pile foundation closely attached to and penetrating through existing structure
The invention discloses an underpinning construction method for an underground excavation pile foundation closely attached to and penetrating through an existing structure, which comprises the steps of presetting an all-round support, constructing a lateral advance support of an underground excavation tunnel, constructing a primary support, arranging a rectangular underpinning structure, chiseling away the pile foundation of the existing structure and the like. The influence of underground excavation on the existing upper structure is reduced by prearranging a temporary bracket of a full-color bracket; meanwhile, by constructing an underpinning beam column, the independent and complete stress systems of the existing structure pile foundation and the underground excavation tunnel main body structure after the existing structure pile foundation is underpinned are guaranteed, the structural stability problem of an upper structure caused by underground structure construction is avoided, the safety risk of underground excavation penetrating through the existing structure pile foundation under the existing structure is reduced, and the construction efficiency is improved. And the engineering safety in the whole process of underpinning construction of the underground excavation pile foundation is ensured.
本发明公开了一种密贴下穿既有结构的暗挖桩基托换施工方法，包括预设满堂红支架、施作暗挖隧道侧向超前支护、施作初期支护、设置矩形托换结构及凿除既有结构桩基等步骤，当新建暗挖工程密贴上部结构底板穿越既有结构桩基时，通过预设满堂红支架临时支托，减小了暗挖开挖对既有上部结构的影响；同时通过施作托换梁柱，保证了既有结构桩基托换后既有结构桩基和暗挖隧道主体结构两者各自独立完整的受力体系，避免了上部结构因地下结构施工产生的结构稳定问题，降低了既有结构下暗挖穿越既有结构桩基的安全风险，确保暗挖桩基托换施工全过程工程安全。
Underpinning construction method for underground excavation pile foundation closely attached to and penetrating through existing structure
The invention discloses an underpinning construction method for an underground excavation pile foundation closely attached to and penetrating through an existing structure, which comprises the steps of presetting an all-round support, constructing a lateral advance support of an underground excavation tunnel, constructing a primary support, arranging a rectangular underpinning structure, chiseling away the pile foundation of the existing structure and the like. The influence of underground excavation on the existing upper structure is reduced by prearranging a temporary bracket of a full-color bracket; meanwhile, by constructing an underpinning beam column, the independent and complete stress systems of the existing structure pile foundation and the underground excavation tunnel main body structure after the existing structure pile foundation is underpinned are guaranteed, the structural stability problem of an upper structure caused by underground structure construction is avoided, the safety risk of underground excavation penetrating through the existing structure pile foundation under the existing structure is reduced, and the construction efficiency is improved. And the engineering safety in the whole process of underpinning construction of the underground excavation pile foundation is ensured.
本发明公开了一种密贴下穿既有结构的暗挖桩基托换施工方法，包括预设满堂红支架、施作暗挖隧道侧向超前支护、施作初期支护、设置矩形托换结构及凿除既有结构桩基等步骤，当新建暗挖工程密贴上部结构底板穿越既有结构桩基时，通过预设满堂红支架临时支托，减小了暗挖开挖对既有上部结构的影响；同时通过施作托换梁柱，保证了既有结构桩基托换后既有结构桩基和暗挖隧道主体结构两者各自独立完整的受力体系，避免了上部结构因地下结构施工产生的结构稳定问题，降低了既有结构下暗挖穿越既有结构桩基的安全风险，确保暗挖桩基托换施工全过程工程安全。
Underpinning construction method for underground excavation pile foundation closely attached to and penetrating through existing structure
一种密贴下穿既有结构的暗挖桩基托换施工方法
ZENG JIALIANG (author) / LI SI (author) / ZHANG CHUNLEI (author) / ZHANG JIQING (author) / LI ZHE (author) / GAO XIANG (author) / ZHAO ZHITAO (author) / ZHANG FULIN (author) / GAO CHAO (author) / LI HONGXIA (author)
2023-03-14
Patent
Electronic Resource
Chinese
IPC:
E02D
FOUNDATIONS
,
Gründungen
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