重庆市某大厦A塔楼转换层RC梁裂缝分析与防治

以重庆市一实际工程为背景,分析了引起干缩裂缝和温度裂缝的原因,并在构件承载力满足的前提下,提出了环氧砂浆封闭裂缝的处理方法,以保证建筑物的整体性和耐久性:同时从材料的选用、施工季节、施工方式、现场管理、构造措施等几个方面提出了预防干缩裂缝和温度裂缝的措施,如选用水化热小和收缩小的水泥,控制砂石含量,降低水灰比;采用分层浇注的方式或采用补偿收缩混凝土并加以适当温度控制的方式浇注大体积混凝土;加强混凝土的养护;设置控制缝或后浇缝以及加强水平构造配筋,等等。上述处理方法和预防措施可供从事工程结构设计和施工的工程技术人员参考。

Crack Analysis and Precaution of the RC Beams of the Transition Layer of the A-tower Dwelling of A Tall Block in Chongqing

The reasons of emergence of dry shrinkage crack and temperature crack are analyzed under the background of a real engineering in Chongqing. In order to guarantee the globality and durability of buildings, the handling method of sealing cracks with epoxy mortar is proposed under the carrying capacity of members satisfied. And the precaution of dry shrinkage crack and temperature crack is proposed from material selection, construction season, construction method, site management and constructional measure etc. , for example, selecting cement with little heat of hydration and little shrinkage, controlling the content of sand and stone, reducing water-cement ration, depositing large volume concrete by layers or by the method of using compensating shrinkage concrete accompanied with the control of temperature, strengthening concrete curing, installing control joint or post-depositing belt, and strengthening horizontal constructional reinforcement, etc. . It can be referred for engineers in design and construction.