施工测量断高调整分析

Discussion on adjusting different elevations at same bench mark in construction survey

在工程建设中,因实际功能需要和建设标准的提高,会遇到从有砟道床变更为无砟道床的情况,相对应的原低等级水准网(四等)已经不能满足测量精度要求,只能调整为高等级(二等),有可能产生断高——水准网的同一水准点上出现不同的高程值。本文结合山西中南部铁路通道建设实例,阐述为确保线路高程连续性而调整线路纵坡,对断高进行处理的方法,并给出了计算实例。

In light of the line＇s purpose and in line with even higher requirements of construction standard,ballast bed may be upgraded to ballastless bed. T herefore,the leveling network adopted before （ level 4） has to be adjusted to level 2,as the accuracy of the former no longer meets the measurement requirements. In such case,broken leveling may occur,in other words,different elevation values can be observed at the same benchmark. T he paper looks into the construction of the railway corridor in the Shanxi-Henan-Shandong railway and proposes that the slope height is to be adjusted accordingly to ensure smooth operation. T he calculation approach is given in detail.