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随着加气混凝土新型节能材料的应用,加气混凝土墙体粉刷层空鼓和裂缝,广泛引起主管部门及社会的关注。本文以实际施工为基础,对其从材料性能及施工技术上提出原因探索及预防措施,以期克服该工艺的缺点。 相似文献
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本文通过大型砂被在上海洋山深水港海堤建设过程中的应用情况,介绍了大型砂被的使用材料、施工船机、施工工艺、质量检测、功效分析等。结果表明,大型砂被在海堤建设工程中的应用是可行的,应用该技术及工艺可以提高施工效率、缩短工期、节约投资。 相似文献
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大型土工织物充灌袋在上海洋山深水港海堤建设中的应用 总被引:1,自引:1,他引:0
通过大型土工织物充灌袋在上海洋山深水港海堤建设过程中的应用情况,介绍大型土工织物充灌袋的使用材料、施工船机、施工工艺、质量检测、功效分析等。结果表明,大型土工织物充灌袋在海堤建设工程中的应用是可行的,应用该技术及工艺可以提高施工效率、缩短工期、节约投资。 相似文献
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在国内外填海造地工程中,常规设计采用砂垫层作为软基处理的水平排水通道,本文通过大面积水下铺设充填砂被在某填海造地工程施工过程中的应用情况,介绍了充填砂被的方案优化过程、施工材料、施工设备、施工工艺、袋体加工及布设、充灌砂、质量检测及施工工效分析等,结果表明大面积水下铺设砂被不仅解决施工期水深不足的问题,而且能够节省工程造价、提升施工效率、缩短工期,工程实践证明该应用在大面积填海造地工程中是经济合理、技术可行的。 相似文献
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本文通过在结构加固施工中应用堵漏补强材料,对几个地下工程混凝土渗漏、损伤缺陷进行堵漏防水及修复加固的综合处理实例,介绍JVS多功能材料性能及压力灌浆、涂刷工艺流程。JVS多功能材料具有能在水中和潮湿的环境中正常施工,且施工简单、速度快、质量易于保证、处理工程费用低等优点。 相似文献
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在桥梁基础施工中,往往涉及到基坑降水问题,降水方案选择的成功与否,对工程质量、工期以及工程造价等有很大影响。文中结合塔里木河特大桥桥墩承台施工中基坑开挖采用的井点降水方法,论述了井点降水系统的设计要点、材料、施工一般步骤及注意事项,介绍了井点的设计方法和应用情况。使用该方法降低了工程费用,加快了工程进度。 相似文献
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处理蓄水调节池湿陷性黄土基础工程,成功应用了复合土工布作为防渗材料,为湿陷性黄土基础防渗处理积累经验,为土工布的推广应用开辟了广阔的前景。会宁县在安全用水供水工程蓄水调节池基础防渗成功应用复合土工布15.4万m2,属全县首例。本文祥介绍该工程土工布的应用,土工布的施工技术、施工过程,方法,注意事项等。 相似文献
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天津港四号卡子门不锈钢空间网架工程的施工技术 总被引:1,自引:0,他引:1
天津港四号卡子门采用不锈钢空间网架结构 ,结构新颖、造型美观 ,与类似的网架相比 ,可节省材料30 %— 4 0 % ,具有明显的经济效益。文中论述了该特殊结构施工的主要工序、施工要点及质量保证措施 ,确保该特殊工程的施工质量。 相似文献
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10CrNi3MoV船用钢热成形的力学行为与性能研究 总被引:2,自引:2,他引:0
高强度船用钢热成形时,由于加热与淬火的交互作用,形成渐变微观结构。研究表明,渐变微观结构使得材料的硬度、强度从里到表依次降低,延展性依次增加,较平缓的冲击力水平及材料的逐层失效使结构保持较高的吸能能力;具有较小的变形抗力、塑性好、成形极限高,而且成形零件的精度和强度较高。渐变微观结构综合了各单相材料的优秀性能,适合用于承受冲击吸能的构件。 相似文献
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The present work is motivated by the increasing need for cost-efficient solutions in offshore structural systems for wind energy production and for improvement of their structural performance. The structural behavior and design of high-strength steel welded tubular connections (yield strength higher than 700 MPa) subjected to monotonic and strong cyclic loading is investigated. In the first part of the paper, an experimental investigation is presented on high-strength steel tubular X-joints subjected to monotonic and cyclic loading far beyond the elastic limit of the material, leading to weld fracture. Two grades of weld metal material are employed in the welding process of the specimens. The experimental results indicate that the weld material grade has a significant influence on the deformation capacity of the welded connection under monotonic loading conditions, and its low-cycle fatigue life. The experimental procedure is simulated using advanced finite element models, elucidating several features of joint behavior and complementing the experimental results. Overall, a good agreement is found between numerical simulations and experimental results, in terms of both global response and local strains at the vicinity of the welds. Furthermore, the structural performance of the welded tubular joints under consideration is assessed using available design methodologies in terms of both ultimate strength and low-cycle fatigue resistance, in an attempt to validate an efficient design methodology for low-cycle fatigue. The results from this research effort are aimed at developing the necessary background for the possible use of high-strength steel in tubular steel lattice structures, particularly in offshore platforms for renewable energy production. They can also be used as a basis for the possible amendment of relevant design specifications and recommendations for including special provisions for high-strength steel structural systems. 相似文献
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电磁兼容中有关电磁屏蔽的设计及工程计算方法的研究 总被引:1,自引:0,他引:1
为了确定电磁屏蔽的屏蔽设计效能,本文采用电磁场传播理论和原理,计算了吸收损耗、反射损耗、二次或多次反射损耗修正系数等以及铜金属板和铁磁金属板的不同频率下的屏蔽效果、多层屏蔽体的屏蔽效果。计算结果显示:屏蔽效能值除了与屏蔽体的材料、结构形式等有关外,还与电磁场源的类型、场源到屏蔽体的距离、电磁场源的频率等有关。 相似文献
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Ship hulls are built with stiffened steel plates and experience continuous fatigue load cycles when in service. Mechanical properties of the steel are expected to change due to the application of these cyclic loads. Therefore, the mechanical properties of the material at various levels of fatigue damage need to be understood. This paper presents two test series that were conducted to determine the effect of two different strain ranges (2000 and 3000 micro strains) of fatigue cycles on the mechanical properties of high-strength structural steel. The test results indicate that the cycle-dependent behaviours of the material can cause a slight increase or a significant decrease in the yield strength when compared to its virgin state. However, the ductility of the steel does not change much as the strain cycle increases. 相似文献