闸墩结构防裂方法探究分析

Investigation and Analysis of Crack Prevention Method of Gate Pier Structure

墩墙结构形式单薄,其混凝土温度裂缝问题一直备受关注。对此,分析了裂缝产生的原因和危害,提出把底板与部分墩墙一起浇筑、改变底板宽度两种方式以降低裂缝产生的可能性,结合三维有限单元法和温度应力仿真计算程序进行计算分析,得出底板与部分墩墙一起浇筑的方式可使闸墩底部拉应力更小,有利于防裂;底板宽度过大不利于防裂;同时通水冷却是增加安全裕度降低开裂风险的有效方式,对实际工程有一定的参考作用,因此要充分发挥其正面作用,避免其负面效果,以达到防裂的目的。

The structural form of pier wall is thin, and the problem of concrete temperature crack has attracted much attention. The causes and damage of cracks were analyzed, and two methods of pouring the bottom plate together with some pier walls and changing the width of the bottom plate were proposed to reduce the possibility of cracks. Combined with three-dimensional finite element method and temperature stress simulation calculation program, it was concluded that pouring the bottom plate together with some pier walls can reduce the tensile stress at the bottom of the gate pier and is conducive to crack prevention;The width of the bottom plate is too large, which is not conducive to crack prevention;At the same time, water cooling is an effective way to increase safety margin and reduce cracking risk, which has a certain reference for practical projects. Therefore, its positive role should be brought into and full play to avoid its negative effects, so as to achieve the purpose of crack prevention.