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对水利建筑物中砖混结构房屋墙体裂缝现象作了扼要分析,结合砌体结构形式及设计与施工中存在的一些问题,提出了防治裂缝出现应采取的预防措施。 相似文献
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分析了砌体结构裂缝的成因,对温度裂缝、收缩裂缝以及沉降裂缝的产生机理进行了分析,提供了温度应力、温度变形和干缩变形的估算方法,讨论了影响砌体结构开裂的因素.针对这些影响因素,提出了预防措施. 相似文献
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针对温差年变幅及夏季气温都不高的滇西地区某砌石拱坝裂缝情况 ,从结构温度应力、非线性温差引起的温度应力 ,结合砌体抗拉强度、施工局部缺陷等方面 ,分析了裂缝的成因 ,并提出有关处理措施的建议 相似文献
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砖混结构顶层温度裂缝的问题是比较普遍存在的问题,因不是结构性裂缝,往往不引起设计,施工方面的注意和重视。对于温度裂缝从设计、施工上采取一些相应的预防措施,对提高永恒建筑质量,避免温裂的发生,有了技术上的保证。 相似文献
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温度应力是导致混凝土结构开裂的重要因素。为考察设置砌体的温控效果,对混凝土结构进行量化仿真计算,从结果得知,设置砌体后减少了混凝土表面出现裂缝的几率,增大了后期强约束区应力,但要采取适当的措施,可以防止裂缝的产生。 相似文献
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针对多层住宅砖砌体的变形裂缝、温度裂缝及沉降裂缝的特征进行了分析,并结合工程实例,介绍了加固处理的方法. 相似文献
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砖混结构房屋墙体产生裂缝缝的原因很多,但主要原因无外乎基础不均匀沉降、温度变化、砂浆强度、砂浆饷度等等,因此为避免墙体出现裂缝就要从设计、施工方面严格按设计规范及施工规范要求操作选择合理的建筑结构作基础形式,精心组织施工,努力提高施工质量,这样才能避免一裂缝的产生,向用户交付满意的工程。 相似文献
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从水库运行情况及砌石坝地质,防渗结构,砌体质量着手,分析漏疸化变化也库水位,温度渗漏水质的相互关系。 相似文献
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Machiwal Deepesh Jha Madan K. Singh P. K. Mahnot S. C. Gupta A. 《Water Resources Management》2004,18(3):219-235
Water-harvesting structures have the potential to increase the productivity of arable lands by enhancing crop yields and by reducingthe risk of crop failure in arid and semi-arid regions, where water shortages are common because of scanty rainfall and its uneven distribution. In semi-arid regions of Rajasthan, India, existing practice of harvesting rainwater is through anicut and earthen embankments. Because of higher costs and higher technical skills involved in the construction of these structures, these structures have not been accepted by the resource-poor local people. Therefore, in the present paper, the detailed design of some low-cost water-harvesting structures using locally available materials and adaptable to the socio-economic conditions of the beneficiaries is discussed. Two types of cost-effective water-harvesting structures, which include dry stone masonry and upstream-wall cement masonry of heights 1, 2, and 2.5 m for catchments of less than 10, 10 to 20, and 20 to 30 ha, respectively are proposed and designed. The analysis of costs involved in constructing dry stone masonry and upstream-wall cement masonry water-harvesting structures, emergency spillway, anicuts and earthen embankments revealed that the earthen embankments have the least cost of construction whereas the anicuts have the highest construction costs for all the selected heights. However, based on the past experiences, earthen embankments are not suitable for the semi-arid regions of Rajasthan. The economic evaluation of the proposed structures indicated that the dry stone masonry structures are very cost-effective for the region with a benefit-cost ratio of 3.5:1 and the net present worth value of Rs. 102978. Although the economic indicators ranked the upstream-wall cement masonry structures lower than the dry stone masonry structures, the former has greater stability and strength compared to the latter. In practice, both the cost-effective water-harvesting structures (i.e., dry stone masonry and upstream-wall cement masonry) are gaining wide acceptance and popularity in the region through some nongovernmental organizations, which have adopted the design presented in this paper. 相似文献
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总结了预制桩沉桩过程中对周围建(构)筑物以及周围环境所产生的影响,并指出施工监测的必要性和监测过程中应当注意的一些问题。 相似文献
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《中华人民共和国招标投标法》施行后,各地都按照招投标法的要求对水利工程建设项目进行了招标投标工作,并取得了一定成效,但是在实际招投标过程中仍然有一些不规范的问题,因此,根据招投标中可能存在的不规范问题,提出了一些粗略的对策。 相似文献
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开源水电站砌石拱坝是一座建筑在软弱基岩非对称河谷上的双曲拱坝,最大坝高45m。在国内同类砌石拱坝中,其体型处于领先的地位,取得了良好的经济效果。这里着重介绍大坝设计特点及软弱地基的加固处理措施。 相似文献
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