共查询到19条相似文献,搜索用时 109 毫秒
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依据民用住宅工程现浇混凝工楼板裂缝的类型及特征,从设计、施工角度探讨了楼板裂缝的性质及产生裂缝的原因,并且针对楼板裂缝的成因,提出了设计、施工方面的裂缝控制措施. 相似文献
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阐述了现浇砼楼板施工裂缝产生的机理、状况及产生的原因,并提出了应抓好砼施工过程中几个重要环节来进行裂缝控制,以及对待施工裂缝的正确态度。 相似文献
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住宅楼现浇混凝土楼板工程施工时,经常会出现不同程度的裂缝,这些不同程度的裂缝在施工时应进行有效的防治,避免造成更大的影响。本文就裂缝产生原因和防治措施进行了探讨。 相似文献
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从设计、商品混凝土、现场施工等方面分析了民用建筑钢筋混凝土楼板裂缝的类型和产生原因,并提出预防了建议。 相似文献
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李先娜 《Canadian Metallurgical Quarterly》2011,(11)
近年来,住宅建设中广泛应用现浇砼楼板,加强了建筑物的抗震性能,取得了很好的效果.但也出现一个非常普遍的质量问题,即楼板裂缝,成为用户质量投诉的热点.试想从裂缝的现状、成因、裂缝控制措施等方面,谈谈自己粗浅的看法. 相似文献
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住宅工程中,经常的且不同程度的存在着楼板裂缝问题。从设计角度看,现行设计规范侧重于按强度考虑,未充分按温差和混凝土收缩特性等多种因素作综合考虑,配筋量因而达不到要求,施工过程中对四周的阳角处楼面板配筋进行加强,负筋不采用分离式配筋,改为沿房间每个阳角全长配置,并且适当加密加粗。采用该方法后,能够较满意地解决好楼板裂缝问题,效果显著。 相似文献
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文章对砖混结构墙体裂缝向题进行了温度应力、地基不均匀沉降、砌体温度、变形等若干项分析,并针对墙体裂缝提出有效的防治措施。 相似文献
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通过对马钢2250热轧带钢土建工程监理实践的总结,提出超长、超深砼结构和重载地坪的质量关键部位,采取加密跟踪、科学计算等事前和事中控制措施,有效解决了主轧线定位、预埋件安装、砼结构裂缝、重载地坪处理和逆作法等施工质量难题,并为类似工程提供了可借鉴的方法。 相似文献
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John Campbell 《国际钢铁研究》2017,88(1)
The control of the metallurgy of steels is now highly developed. This is in contrast to the casting techniques for steels. Although continuous casting is generally conducted well, current ingot casting techniques are poor, unnecessarily introducing masses of oxides. For some steel compositions, double oxide films, bifilms, are entrained. This mechanism, occurring naturally during pouring, but till now generally overlooked, appears to be capable of explaining most of the features of steel defects in all their forms. For most Ni alloys and some steels it appears capable of generating a dense population of cracks, greatly impairing subsequent mechanical working and even final properties. In other steels the effects are much less severe. The techniques to avoid this damage to liquid steels and Ni alloys are described, including contact pouring, and naturally pressurized filling system designs. An ultimate system is counter gravity casting. For remelting processes, the risks of unreliability because of cracks intrinsic to VIM and VAR are discussed for both shop floor production and laboratory research. The potential crack‐free properties of ESR when correctly made are recommended. Even so, remelting processes might constitute an unnecessary luxury if steels and Ni alloys were cast to avoid the entrainment of oxides. 相似文献
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论述了砖混结构房屋顶层墙体易产生裂缝的原因,分析了导致这一现象的各种不利因素,并给出了有效的处理措施。 相似文献
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Mehdi Setareh John K. Ritchey Anthony J. Baxter Thomas M. Murray 《Canadian Metallurgical Quarterly》2006,20(1):64-73
This paper presents the results of the analytical and experimental studies of a pendulum tuned mass damper (PTMD) to control excessive floor vibrations due to human movements. The PTMD used in this study acts as a passive tuned mass damper. An equivalent single-degree-of-freedom model for the PTMD is developed and used to derive the equations of motion of the coupled PTMD-floor system. The optimal design parameters of the PTMD are found using an optimization algorithm. Effects of off-tuning of the PTMD due to the variations in the floor mass on its response are investigated. Results of the tuning of the PTMD on a laboratory test floor are presented along with the off-tuning effects. These results indicate that a properly tuned PTMD can significantly reduce the excessive floor vibrations. In addition, when subjected to off-tuning due to variations in the floor live load the PTMD may or may not be able to perform effectively depending on the level of human-structure dynamic interactions. Finally, examples of the PTMD already in use to control excessive floor vibrations are presented. 相似文献
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文章从温度收缩变形、干缩变形、地基不均匀沉降、荷载作用等方面分析了砌体结构房屋常见裂缝的原因,在剖析砌体裂缝根源的基础上,结合相关规范的防裂措施,总结裂缝控制的方法. 相似文献