蜗壳座环与混凝土基础联合受力应力分析研究

本文根据蜗壳、座环应力计算和实测资料,进行了系统而大量的有限元分析,得出了符合实际情况的力学模型,提高了计算精度,满足了大型机组的设计要求。又在深入研究一些主要因素相互影响的基础上,提出了大型水电机组有关构件联合承载的新建议。     

预应力锚束张拉锁定损失控制

预应力混凝土闸墩可以简化泄水建筑物结构、节省大量钢筋和方便施工,因此被越来越多地采用。锚束张拉中锁定损失控制是张拉过程中较为棘手的问题,锚束愈短愈难达到设计要求。针对此问题,就理论分析和实际操作控制方面提供了可借鉴的经验。     

汽车用线缆的新发展

本文介绍随着汽车工业的现代化而对汽车内所用的电线电缆的改进。这些改进主要是用双金属线(铜包钢和铜包铝)来替代传统的铜导线;用新型的可交联聚酯弹性体来替代传统的绝缘材料。其主要目的在于减小线缆的尺寸和重量,增加了线缆的柔软性、耐热水性和耐热性等机械物理性能。文章描述了这些新产品的开发、性能试验和应用。     

三峡地下电站厂房顶拱无粘结预应力锚索施工技术

为了监测三峡地下电站厂房顶拱部位的岩体变形,安装了有锚索测力计的10束2500 kN无粘结预应力锚索,对其施工工序和技术加以介绍。     

白集矿深井回巷道相似模拟研究

本实验基于相似模拟试验方法,结合白集矿深井回采巷道的地质条件,运用和原型力学性质相似的材料,按照一定的比例模拟岩体和煤层。在满足相似的边界条件及初始条件下,在平面应变情况下通过对比三种支护形式的性能差异,定性分析围岩中主动支护和被动支护对巷道稳定性的影响。对锚梁网索联合支护结构的稳定性效果进行分析研究。     

综采工作面移动变电站拖曳电缆的滑车装置

介绍了综合机械化采煤工作面移动变电站拖曳电缆的电缆滑车装置的设计方案，并总结了使用后的效果。     

Understanding Electrical Performance and Microstructure of Water Tree Aged Cables after Silicone Injection during Electrical-Thermal Accelerated Aging

To further understand the long-term effect of rejuvenation fluid on water tree aged cross-linked polyethylene (XLPE) cables after silicone injection, electrical performance and microstructure of water tree aged cables were investigated during an electrical-thermal accelerated aging experiment. Two groups of treated and untreated water tree aged cable samples were subjected to electrical-thermal aging for 2 weeks. The results of the dielectric loss factor showed that the electrical performance of the treated samples was significantly better than that of untreated samples after electrical-thermal aging. Microobservation results showed that the overall water tree sizes of the treated samples were much smaller than those of the untreated samples after electrical-thermal aging. Furthermore, there was a second growth of water trees in the original water tree region during electrical-thermal aging in both groups of samples. Using scanning electron microscopy (SEM) and energy-dispersive spectroscopy (EDS), rejuvenation fillers were observed tightly embedded in water tree voids after electrical-thermal aging. The infrared (IR) spectroscopy analysis results showed that the concentration of rejuvenation fluid increased from the outer layer to the inner layer of insulation. Based on the results, due to the improvement of the electric field at the water tree tip and the diffusion of silicone fluid in the insulation layer, both the second growth in the original water tree region and continuing growth at the water tree tip can be effectively inhibited.     

高温超导电缆的研发现状和发展趋势

与常规电缆相比,高温超导电缆具有体积小、重量轻、容量大、电流密度高、损耗低、环境友好等优势,为未来电网提供了一种新的电力传输方式。随着高温超导线材取得的重要研究进展,国际上相继开展了高温超导电缆的研发,已有多条超导电缆工程成功地进行了挂网示范运行。本文介绍高温超导电缆的研发进展情况,并简单对高温超导电缆的发展趋势和关键技术做出展望。     

高速铁路特大钢桁拱桥挂索施工技术研究

挂索是特大钢桁拱桥施工工艺中极为关键的一个环节。论文结合某高速铁路特大钢桁拱桥施工的成功实践,详细阐述了该特大钢桁拱桥挂索的施工方法,为大跨度铁路钢桁拱桥施工提供了可供借鉴的技术资料。     

斜塔无背索斜拉桥研究

斜塔无背索斜拉桥受力特性与常规的直塔斜拉桥有较大的差异,造成了其设计以及施工的特殊性。本文以长沙洪山大桥为工程背景,对无背索斜拉桥的受力特性、施工以及桥塔的重量分布和倾角进行了探讨,为今后同类桥梁的结构设计提供了参考。