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本文主要讨论和分析了中丹水平子午环基框由于热变形引起的相对于基墩的方位变化;描述了水平子午环基框的结构及其4点支承的设计原理;介绍了基框方位变化的测试方法;给出了基框方位随温度变化的测试结果,分析表明其变化量大约为-0.18″/度。测试基框方位变化的目的,在于研究它随温度变化的规律,求出其变化量并修正观测结果。
This paper mainly discusses and analyzes the azimuthal variation of the horizontal meridian ring base frame due to thermal deformation relative to the base piers; the structure of the horizontal meridian ring base frame and the design principle of the four-point support are described; the change of the azimuth of the base frame The test results show that the variation of azimuth of base frame with temperature is about -0.18 "/ degree. The purpose of testing the change of azimuth of base frame is to study the law of its change with temperature, Change the amount and correct the observations.