带支撑梁的船闸闸室裂缝成因分析

针对某船闸闸室施工期在支撑梁上部出现表面裂缝的问题,基于有限元原理,分析闸室表面裂缝的成因及分布规律,并提出防止表面裂缝产生的温控措施.分析结果表明:早期在支撑梁上部出现表面裂缝主要是因为内外温差以及支撑梁对新浇筑混凝土的约束作用;在控制浇筑温度的基础上,采取表面保温和内部水管冷却相结合的温控措施,可以将表面点的抗裂安全系数提高至1. 40.该方案在后续施工应用后未出现表面裂缝,达到了良好的防裂效果.

Causes of crack in ship lock chamber with support beam

Aiming at the problem of surface cracks generated in the upper part of the support beam during construction of a ship lock chamber,we analyze the causes and distribution of surface cracks of the chamber based on the finite element principle,and put forward the temperature control measures.The results show that the early surface cracks in the upper part of the support beam are mainly due to the internal-external temperature difference and the restriction effect of the support beam on the newly cast concrete;under the prerequisite of controlling the concrete casting temperature,we combine the surface heat preservation and internal water pipe cooling to control the temperature difference and the crack prevention coefficient of surface points is raised to 1.40.Applying the measure in subsequent construction,no surface cracks appear,which prove a satisfactory anti-cracking effect.