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A platform for research: civil engineering, architecture and urbanism
Long-span steel box girder cable-stayed bridge liquid nitrogen constant-temperature closure device and construction method
The invention relates to a long-span steel box girder cable-stayed bridge liquid nitrogen constant-temperature closure device and a construction method, and the device comprises a nitrogen supply mechanism which is used for conveying liquid nitrogen into a steel box girder box chamber; the flow adjusting assembly is arranged on the conveying pipeline of the nitrogen supply mechanism and used for adjusting the liquid nitrogen conveying rate of the nitrogen supply mechanism; the temperature sensor is used for monitoring the temperature of the steel box girder; and the control system controls the conveying rate of the nitrogen supply mechanism through the flow control assembly according to data of the temperature sensor. By means of the principle of liquid nitrogen volatilization cooling, the temperature of the steel box girder can be rapidly reduced to the designed temperature, closure precision reduction caused by pushing, matched cutting and the like before closure is avoided, and damage to a main girder or a main tower structure due to the fact that the environment temperature is too high and the pushing force is too large is also avoided; and meanwhile, the temperature of the steel box girder is kept constant in the closure process, it can be guaranteed that the steel girder is not heated and deformed due to sunlight exposure in the daytime during welding after closure positioning at night, and the situation that the closure precision and quality are reduced due to the fact that positioning punching nails are sheared and broken is avoided.
本申请涉及一种大跨度钢箱梁斜拉桥液氮恒温合龙装置及施工方法，装置包括：供氮机构，其用于向钢箱梁箱室内输送液氮；流量调节组件，其设于供氮机构的输送管路上用于调节供氮机构的液氮输送速率；温度传感器，其用于监测钢箱梁温度；控制系统，其根据温度传感器的数据通过流量控制组件控制供氮机构的输送速率。本申请利用液氮挥发降温的原理，可快速将钢箱梁温度降低至设计温度，避免合龙前顶推、配切等造成合龙精度降低，也避免了因环境温度过高，顶推力过大而造成主梁或者主塔结构的损坏；同时在合龙过程中保持钢箱梁恒温，可以保证夜间合龙定位后，焊接期间钢梁不受日间阳光暴晒而升温变形，避免定位冲钉受剪断裂，导致合龙精度和质量降低。
Long-span steel box girder cable-stayed bridge liquid nitrogen constant-temperature closure device and construction method
The invention relates to a long-span steel box girder cable-stayed bridge liquid nitrogen constant-temperature closure device and a construction method, and the device comprises a nitrogen supply mechanism which is used for conveying liquid nitrogen into a steel box girder box chamber; the flow adjusting assembly is arranged on the conveying pipeline of the nitrogen supply mechanism and used for adjusting the liquid nitrogen conveying rate of the nitrogen supply mechanism; the temperature sensor is used for monitoring the temperature of the steel box girder; and the control system controls the conveying rate of the nitrogen supply mechanism through the flow control assembly according to data of the temperature sensor. By means of the principle of liquid nitrogen volatilization cooling, the temperature of the steel box girder can be rapidly reduced to the designed temperature, closure precision reduction caused by pushing, matched cutting and the like before closure is avoided, and damage to a main girder or a main tower structure due to the fact that the environment temperature is too high and the pushing force is too large is also avoided; and meanwhile, the temperature of the steel box girder is kept constant in the closure process, it can be guaranteed that the steel girder is not heated and deformed due to sunlight exposure in the daytime during welding after closure positioning at night, and the situation that the closure precision and quality are reduced due to the fact that positioning punching nails are sheared and broken is avoided.
本申请涉及一种大跨度钢箱梁斜拉桥液氮恒温合龙装置及施工方法，装置包括：供氮机构，其用于向钢箱梁箱室内输送液氮；流量调节组件，其设于供氮机构的输送管路上用于调节供氮机构的液氮输送速率；温度传感器，其用于监测钢箱梁温度；控制系统，其根据温度传感器的数据通过流量控制组件控制供氮机构的输送速率。本申请利用液氮挥发降温的原理，可快速将钢箱梁温度降低至设计温度，避免合龙前顶推、配切等造成合龙精度降低，也避免了因环境温度过高，顶推力过大而造成主梁或者主塔结构的损坏；同时在合龙过程中保持钢箱梁恒温，可以保证夜间合龙定位后，焊接期间钢梁不受日间阳光暴晒而升温变形，避免定位冲钉受剪断裂，导致合龙精度和质量降低。
Long-span steel box girder cable-stayed bridge liquid nitrogen constant-temperature closure device and construction method
一种大跨度钢箱梁斜拉桥液氮恒温合龙装置及施工方法
ZHANG MEILING (author) / WANG WENYANG (author) / REN HONGCHANG (author) / PENG XUMIN (author) / CAO MINGMING (author) / WEI DONGSHENG (author) / WANG KEBING (author) / TANG JIARUI (author) / LIU XIULING (author) / CHEN ZHONGYU (author)
2023-05-09
Patent
Electronic Resource
Chinese
IPC:
E01D
BRIDGES
,
Brücken
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