船闸闸首混凝土温控防裂研究  

Study on Temperature Control and Crack Prevention of Shiplock Head Concrete Constructing in Low-temperature Season

作　　者：覃茜 颉志强[1,2] 祁勇峰[1,2] QIN Xi;XIE Zhiqiang;QI Yongfeng(Department of Materials&Structures,Changjiang River Scientific Research Institute,Wuhan 430010;Technological Research Center on Engineering Safety&Disaster Prevention of Ministry of Water Re-sources,Wuhan 430010,China)

机构地区：[1]长江科学院材料与结构研究所,武汉430010 [2]水利部水工程安全与病害防治工程技术研究中心,武汉430010

出　　处：《三峡大学学报（自然科学版）》2022年第2期43-49,共7页Journal of China Three Gorges University：Natural Sciences

基　　金：国家自然科学基金(52009011)。

摘　　要：船闸闸首结构复杂,属于大体积薄壁混凝土,施工期易在底板和输水廊道层等部位产生温度裂缝,影响结构的稳定与运行安全.本文以在建某船闸上闸首为研究对象,通过有限元仿真计算,研究了表面保温、通水冷却和吊空模板等温控措施对底板、输水廊道层温度场和应力场的影响.研究表明:表面保温能降低内外温差和昼夜温差的影响,最大拉应力降幅约0.37 MPa;通水冷却措施能大幅降低后期最大拉应力,最大降幅0.92 MPa;吊空模板能提高输水廊道隔墙层的最小抗裂安全度,最大增幅为0.63.因此,针对闸首需在底板和输水廊道部位采取相应的温控措施,降低结构开裂风险.Due to mass and thin-wall concrete, the structure of shiplock head is complex, During the construction period, temperature cracks would easily developed in bottom plate and water conveyance gallery layer, which would affect stability of the structure and safety of water conveyance. By using finite element simulation method, the influences of different temperature control measures, such as surface heat preservation, water cooling, and hanging formwork, on the temperature and stress field of bottom plate and water conveyance gallery layer constructing in low-temperature season were studied. The results showed that surface heat preservation could reduce the influence of internal and external temperature difference and diurnal temperature difference. The maximum first principal stress could reduce by 0.37 MPa. Water cooling could significantly reduce the maximum first principal stress in later period by 0.92 MPa. The hanging formwork could improve the minimum crack resistance safety of partition wall of the water conveyance gallery with the maximum amplitude of 0.63. Therefore, it is necessary to take corresponding measures in bottom plate and water conveyance gallery layer of the lock head to reduce the risk of structural cracking.

关 键 词：船闸闸首 混凝土裂缝 仿真计算 温度应力 温控防裂 

分 类 号：TV315[水利工程—水工结构工程]