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在桥梁设计的过程中,下部结构的考虑是否得当,对工程造价、工程质量及后期使用影响较大,介绍了几种常见的桥梁下部结构形式,分析了不同结构形式的受力的特点,对桥梁墩、台的形式选择及结构设计中的一些问题进行了初步探讨. 相似文献
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高涛 《科技成果管理与研究》2008,(9):29-31
跨海大桥的建设之所以和普通的桥梁不同,桥梁的下部结构的施工对风浪、急流则更加敏感,所以研究合适的设计与施工技术对于加快作业速度以便减少作业时间是绝对必须的。本文笔者即围绕跨海大桥下部基础施工技术展开讨论,通过对跨海大桥下部结构设计与施工技术的分析和研究,归纳总结跨海大桥下部结构的设计与施工原则,在此基础上对下部结构的设计和施工进行总结。 相似文献
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城市高架桥下部空间作为城市新空间的一种,对市民生活、城市交通、城市景观有较强的影响作用。文章从桥下空间具有城市公共空间属性的角度,去认识桥下空间的特点与制约因素,并提出今后高架桥下空间利用的适应原则和对策措施。 相似文献
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新主井煤仓在试运行期间经常堵仓,经过对新井煤仓堵仓原因进行深入分析,提出改造方案,成功的解决了煤仓堵仓问题,满足了矿井正常生产需求。 相似文献
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Type-dependent differential expression of neuropeptide Y in chicken hypothalamus (Gallus domesticus)
Chen GQ Hu XF Sugahara K Chen JS Song XM Zheng HC Jiang YQ Huang X Jiang JF Zhou WD 《Journal of Zhejiang University. Science. B》2007,8(11):839-844
Neuropeptide Y (NPY) is one of the most important orexigenic agents in central regulation of feeding behavior, body weight and energy homeostasis in domestic chickens. To examine differences in the hypothalamic NPY between layer-type and meat-type of chickens, which are two divergent kinds of the domestic chickens in feeding behavior and body weight, we detected mRNA levels of NPY in hypothalamic infundibular nucleus (IN), paraventricular nucleus (PVN) and lateral hypothalamic area (LHA) of these two types of chickens using one-step real time RT-PCR. The meat-type chicken had more food daily (about 1.7 folds) and greater body weights (about 1.5 folds) and brain weights than the layer-type chicken at the age of 14 d. In the meat-type of chicken, NPY mRNA levels of the IN and PVN were significantly greater than those of the LHA, and were not significantly different between the IN and PVN. However, in the layer-type of chicken, NPY mRNA levels were significantly greater in the IN than those in the LHA and PVN, and were not significantly different between the PVN and LHA. In all these hypothalamic regions, the layer-type of chicken had significantly higher NPY mRNA levels than the meat-type chicken did. These results suggest the expression of NPY in the hypothalamus has a type-dependent pattern in domestic chickens. 相似文献
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于兆学 《石家庄铁路职业技术学院学报》2008,7(2):7-12
浙江平湖通天桥工程主桥采用空间索桁桥结构,全桥由下部主体结构和上部索桁结构组成.结合工程实际,介绍该桥下部主体结构水中轻型墩施工技术. 相似文献
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