共查询到20条相似文献，搜索用时 78 毫秒
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介绍挂篮施工的基本原理,并结合浙江省新昌县沃西大桥的施工实际,提出相应的挂篮放样的方法、挂篮模板定位预拱度的计算,以及桥梁在浇注过程中的过程监测,及时的了解了挂篮变形情况,保障了大桥施工的顺利进行。 相似文献
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武汉长江公路斜拉桥主梁架设采用８米牵索挂篮对称悬浇灌注法，该方法虽施工速度快，但是在动态中施工、难度大，施工干扰多，给施工测量带来许多不利，提出许多新问题新要求，本文就主梁架设过程中所采用的一些施工测量方法及其精度作一介绍，实践证明，这此方法对保证主梁架设质量和施工进度起到了重要作用。 相似文献
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绍兴市昌安立交桥系省重点工程。是全省最大的城市立交桥，由二条主道、六道匝道组成，大桥总长达2763．291m。我们受甲方委托对大桥施工放样进行监理。因为监理是施工放样最后一道关口，为了保证大桥建设精度，如何做到监理质量的高精度，是一个十分重要的测量课题。 相似文献
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根据傅科第一类回转仪的设想模型，本文用分析力学的方法研究了单自由度陀螺寻北仪的定向原理，分析了陀螺轴的运动规律，建立了多种因素如陀螺力矩，常阻尼力矩和空气阻尼等影响下的运动微分方程，分别求出对应解，并用小扰动理论研究了稳定性。 相似文献
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为了在西部大开发中更好地为四川的经济的发展提供测绘保障,四川省测绘局决定重新编制《四川省地图集》。本文从几个方面探讨了新版《四川省地图集》的编制，主要包括编制背景，如何选择使用现势性资料，出版方式，装帧设计，结构设计，重点探讨了各图组内容表示的设计。 相似文献
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《测量评论》2013,45(18):241-242
AbstractIn working out vertical heights on the Akuse-Kete Krachi chain of triangulation in the Gold Coast a fairly considerable difference was found between values of the coefficient of refraction obtained from observations taken during the day and those taken at night, the mean values being 0.069 for daylight observations to heliographs and 0.087 for night observations to lamps. This difference no doubt is due mainly to the condition of the atmosphere during the day differing from its condition during the night rather than to any effect due to different sources of light. A new chain has recently been observed in Western Ashanti, and the index of refraction for the daylight observations again gave a lower value than that obtained from the night observations, the figures being 0.073 and 0.099 respectively. For the night work three different sources of light were used, hurricane lamps for short lines, Tilley vapour-pressure lamps for lines of intermediate length, and McCaw acetylene signalling lamps by Watts for long lines. It occurred, therefore, to the writer to examine the results to see if the mean values of the index of refraction showed any variations for the different light sources, since it seemed reasonable to suppose that the constitution of the light emitted from each source would be different and hence that the coefficient of refraction might vary. 相似文献
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Ye. V. Fadeyeva 《地理信息系统科学与遥感》2013,50(1):19-23
A method is proposed for the calculation, based on the Goudriaan model, of estimates of various combinations of spectral radiance coefficients Pi which are optimal for interpretation of soil color and moisture, vegetation cover density, above-ground reserves of phytomass, and color and orientation of phytoelements. These estimates correspond rather closely with actual measurements obtained from the field. Translated from: Vestnik Moskovskogo Universiteta, geografiya, 1986, No. 4, pp. 75-79. 相似文献
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人口地理信息系统应用软件的开发 总被引：2，自引：0，他引：2
本文以区域性人口地理信息系统的设计原理和模式为目标,以目前世界上流行较广的GIS商业软件ARC／INGO为平台,用ARC／INFO的二次开发语言AML为工具,建立了一个区域性人口地理信息系统,以实现人口及其相关数据的存贮、查询检索、分析处理和应用,可为用户提供各种数据、图件和报表等信息产品。 相似文献
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IGS精密钟差精度分析 总被引：1，自引：0，他引：1
对比了IGS官方提供的5 min和30 s间隔的精密钟差变化规律,分析了利用8阶滑动式Lagrange多项式插值和线性插值将精密钟差内插至30 s间隔的精度及可行性,得出了一些国内文献未论及的结论。 相似文献
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《测量评论》2013,45(38):480-481
AbstractIn a letter published in a recent issue of Nature, Prof. L. F. Bates and Mr J. C. Wilson, of University College, Nottingham, have described a new and novel method of determining the coefficient of thermal expansion of invar. Although this method is hardly likely to be applied to the measurement of the coefficient of expansion of long invar tapes, such as are used by surveyors, yet it is so novel and ingenious in itself that a short reference to it may not be out of place in this Review. One extremely interesting thing about it is that no measurements of a length, or of changes of length, are involved. 相似文献