清远枢纽二线船闸混凝土通水冷却智能控制

水管通水冷却是大体积混凝土温度控制最常采取的施工温控措施之一,人工操作劳动强度大,成本高。针对船闸结构混凝土温控特点,依据有关规范和借鉴地下水工衬砌混凝土通水冷却智能控制经验,确定了结构混凝土通水冷却智能控制3个参数(通水时间、冷却水温和温降速率),提出了内部温度曲线控制目标和智能控制技术方法,并配套研制了智能化控制设备,在清远二线船闸上闸首底板实践应用。试验结果证明闸首底板混凝土内部最高温度、温降速率全部控制在允许值范围内,全面验证了“温升阶段全时通水降低最高温度、温降阶段间歇性通水控制流量和温降速率”以及终止通水冷却时间控制等技术方法的科学性、适用性,且该智能控制设备操作简便、性能可靠。

Intelligent Control of Water Cooling in the Second-line Ship Lock Concrete of Qingyuan Headwork

Pipe cooling is one of the most commonly used temperature control measures during the construction period of mass concrete.Manual operation is labor-intensive and costly.According to the characteristics of temperature control for the ship lock structure concrete,based on the related specifications and the experience of intelligent control of water cooling for the underground hydraulic lining concrete,three intelligent control parameters of water cooling(time for water cooling,water temperature and temperature falling velocity)for structural concrete are determined.Furthermore,the control objectives of internal temperature curve and technical methods for intelligent control are proposed.According to the research findings,intelligent control device is developed and applied to the bottom plate of upper lock head in Qingyuan second-line ship lock.The practice has shown that the maximum internal temperature and temperature falling velocity of the concrete inside the bottom plate of upper lock head are all controlled within the allowable range,which fully verifies the scientificity and applicability of technical methods such as“full-time water cooling during temperature rise stage to reduce the maximum temperature,intermittent water cooling during temperature drop stage to control water flow and temperature falling velocity”and the control of termination time for water cooling.What is more,the intelligent control device can easily be operated and relied on in performance.Consequently,the adopted methods and techniques deserve further promotion and application.