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Active control method for sinking of open caisson structure of bridge pier and abutment
The invention provides an active sinking control method for a bridge pier and abutment open caisson structure, which comprises the following steps of: 1, carrying out excavation operation according to a preset position designed by a bridge, prefabricating a bridge pier and abutment open caisson at a preset position, mounting water pipes on the wall of the open caisson and in each partition wall, and mounting and arranging high-pressure nozzles on a bottom surface blade pedal surface and the bottom surfaces of the partition walls, when open caisson sinking construction is started, firstly, high-pressure water flow is opened to loosen a lower soil body, the bearing capacity of the soil body is reduced, then sinking is conducted depending on self weight, and an internal soil body is excavated; the high-pressure nozzles are controlled in a grading and zoning mode, during sinking construction of the open caisson, the nozzles are firstly opened step by step, the sinking amount of the open caisson of each stage of water pipe at the same time is observed, and if the open caisson does not sink within the fixed time, the next stage of water pipe continues to be opened. And 2, while water jetting of the water pipes is controlled in a grading mode, sediment suction and removal operation is conducted in all the well holes in cooperation with a suction dredger at the same time, and therefore the end resistance value of the bottom end of the open caisson is reduced, and active sinking of the bridge pier and abutment open caisson structure is achieved.
本发明提供了一种桥梁墩台沉井结构下沉主动控制方法，步骤1，根据桥梁设计的预设位置进行开挖作业，在预定位置预制桥梁墩台沉井，在沉井井壁和各隔墙内的安装水管，在底面刃脚踏面及隔墙底面安装布设高压喷嘴，开始沉井下沉施工时，先开通高压水流疏松下面土体，降低土体承载力，然后依靠自重下沉，开挖内部土体；将高压喷嘴进行分级、分区控制，沉井下沉施工时，先逐级开通喷嘴，观察每一级水管在相同时间下的沉井下沉量，若在固定时间内，沉井不发生下沉，则继续开通下一级水管。步骤2，在分级控制水管射水的同时，各井孔内同时配合吸泥机进行吸除底泥作业，从而减小沉井底端端阻力值，从而实现桥梁墩台沉井结构的主动下沉。
Active control method for sinking of open caisson structure of bridge pier and abutment
The invention provides an active sinking control method for a bridge pier and abutment open caisson structure, which comprises the following steps of: 1, carrying out excavation operation according to a preset position designed by a bridge, prefabricating a bridge pier and abutment open caisson at a preset position, mounting water pipes on the wall of the open caisson and in each partition wall, and mounting and arranging high-pressure nozzles on a bottom surface blade pedal surface and the bottom surfaces of the partition walls, when open caisson sinking construction is started, firstly, high-pressure water flow is opened to loosen a lower soil body, the bearing capacity of the soil body is reduced, then sinking is conducted depending on self weight, and an internal soil body is excavated; the high-pressure nozzles are controlled in a grading and zoning mode, during sinking construction of the open caisson, the nozzles are firstly opened step by step, the sinking amount of the open caisson of each stage of water pipe at the same time is observed, and if the open caisson does not sink within the fixed time, the next stage of water pipe continues to be opened. And 2, while water jetting of the water pipes is controlled in a grading mode, sediment suction and removal operation is conducted in all the well holes in cooperation with a suction dredger at the same time, and therefore the end resistance value of the bottom end of the open caisson is reduced, and active sinking of the bridge pier and abutment open caisson structure is achieved.
本发明提供了一种桥梁墩台沉井结构下沉主动控制方法，步骤1，根据桥梁设计的预设位置进行开挖作业，在预定位置预制桥梁墩台沉井，在沉井井壁和各隔墙内的安装水管，在底面刃脚踏面及隔墙底面安装布设高压喷嘴，开始沉井下沉施工时，先开通高压水流疏松下面土体，降低土体承载力，然后依靠自重下沉，开挖内部土体；将高压喷嘴进行分级、分区控制，沉井下沉施工时，先逐级开通喷嘴，观察每一级水管在相同时间下的沉井下沉量，若在固定时间内，沉井不发生下沉，则继续开通下一级水管。步骤2，在分级控制水管射水的同时，各井孔内同时配合吸泥机进行吸除底泥作业，从而减小沉井底端端阻力值，从而实现桥梁墩台沉井结构的主动下沉。
Active control method for sinking of open caisson structure of bridge pier and abutment
一种桥梁墩台沉井结构下沉主动控制方法
GAO ZHIYU (author) / LIU DACHENG (author) / WANG ZHIQIANG (author) / ZHANG ZHIXIN (author) / WANG DONGWEI (author) / YANG SHENGFENG (author) / LIAO PENG (author) / FENG YANPING (author) / WANG JINGYU (author) / XU LIANGKANG (author)
2023-01-24
Patent
Electronic Resource
Chinese
IPC:
E02D
FOUNDATIONS
,
Gründungen
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