【Utilities – Civil Engineering Version】20181114
Thread Content
Precautions for column installation measurement (). A: The theodolite used must be carefully calibrated; during operation, the bubble in the level tube of the aiming device should be kept perfectly centered. B: When calibrating, in addition to ensuring that the column is vertical, it is also necessary to check constantly whether the center line of the column aligns with the axis marker on the cup-shaped structure, in order to prevent horizontal displacement of the column after it is installed in place. C: When calibrating columns with variable cross-sections, the theodolite must be positioned on the axis of the column row to avoid errors. D: When checking the verticality of columns under sunlight, the effect of sunlight causing the top of the column to bend toward the shaded side must be taken into account; to avoid this effect, it is advisable to carry out the calibration in the morning or on cloudy days. E: The allowable verticality error for columns with a height greater than 5 meters is ±8 mm, while for columns with a height of ≤5 meters, the allowable error is ±5 mm. Answer: ABCDE
A: The theodolite used must be carefully calibrated; during operation, the bubble in the level tube of the aiming device should be kept perfectly centered. B: When carrying out calibration, in addition to ensuring that the column is vertical, it is also necessary to constantly check whether the center line of the column aligns with the axis markers on the cup-shaped structure, so as to prevent horizontal displacement of the column after it has been installed in place. C: When calibrating columns with variable cross-sections, the theodolite must be positioned on the axis of the column array to avoid errors. D: When calibrating the verticality of columns under sunlight, the effect of sunlight causing the top of the column to bend toward the shaded side must be taken into account; to avoid this effect, it is advisable to carry out calibration in the morning or on cloudy days. E: When the column height is greater than 5 meters, the allowable verticality error is ±8 mm, while when the column height is ≤5 meters, the allowable error is ±5 mm
Precautions for column installation measurement (ABCDE). A: The theodolite used must be carefully calibrated; during operation, the bubble in the level tube of the aiming device should be kept perfectly centered. B: When carrying out calibration, in addition to ensuring that the column is vertical, it is also necessary to constantly check whether the center line of the column aligns with the axis markers on the cup-shaped structure, so as to prevent horizontal displacement of the column after it has been installed in place. C: When calibrating columns with variable cross-sections, the theodolite must be positioned on the axis of the column array to avoid errors. D: When calibrating the verticality of columns under sunlight, the effect of sunlight causing the top of the column to bend toward the shaded side must be taken into account; to avoid this effect, it is advisable to carry out calibration in the morning or on cloudy days. E: When the column height is greater than 5 meters, the allowable verticality error is ±8 mm, while when the column height is ≤5 meters, the allowable error is ±5 mm