使用激光投线仪检测电缆桥架垂直度的方法如下：

　　The method of using a laser wire projector to detect the verticality of cable trays is as follows:

　　一、准备工作

　　1、 Preparation work

　　检查仪器完好性，确保电池充满电并正确安装

　　Check the integrity of the instrument, ensure that the battery is fully charged and installed correctly

　　调平仪器：打开支架、粗调伸缩器水平，微调旋钮使激光水泡居中（部分仪器支持自动整平）

　　Leveling instrument: Open the bracket, roughly adjust the expansion joint to horizontal, and fine tune the knob to center the laser water bubble (some instruments support automatic leveling)

　　二、测量步骤

　　2、 Measurement steps

　　设置基准点：在立柱底部和顶部选择固定点，确保共线

　　Set reference point: Select fixed points at the bottom and top of the column to ensure collinearity

　　发射激光线：开启电源，通过调焦螺旋使激光十字清晰

　　Launch laser line: Turn on the power and use the focusing screw to make the laser cross clear

　　标记定位线：用激光线在相邻立柱上划出垂直基准线

　　Marking positioning line: Use a laser line to draw a vertical reference line on adjacent columns

　　调整支撑臂：根据基准线安装支撑臂，使用水平尺检查每排臂的垂直度（误差≤5mm）

　　Adjust the support arm: Install the support arm according to the reference line and use a level to check the verticality of each row of arms (error ≤ 5mm)

　　三、偏差计算

　　3、 Deviation calculation

　　选择测量工具：经纬仪或激光测距仪辅助验证

　　Choose measurement tool: theodolite or laser rangefinder for auxiliary verification

　　计算垂直度偏差：实际测量值与理论垂直线的差值（正值表示内倾，负值表示外倾）

　　Calculate verticality deviation: the difference between the actual measured value and the theoretical vertical line (positive values indicate inward inclination, negative values indicate outward inclination)

　　四、注意事项

　　4、 Precautions

　　零位校准：定期校准水平仪零位，避免测量误差

　　Zero calibration: Regularly calibrate the zero position of the level to avoid measurement errors

　　误差标准：垂直度偏差≤2mm时合格，否则需调整激光仪补偿装置

　　Error standard: The verticality deviation is qualified when it is ≤ 2mm, otherwise the laser instrument compensation device needs to be adjusted

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