How to measure flatness and verticality with a ruler? Can a ruler measure slope
How to measure flatness and verticality with a ruler
A ruler is a measuring tool commonly used to measure the flatness, verticality, and ground flatness of walls. The use of a ruler varies depending on the measurement requirements:
1. Measuring verticality with a ruler
Hold a 2m ruler in the center and place it on a wall that is at the same waist height as oneself (when the wall height is less than 2m, use a 1m ruler to measure). If the foot or finish under the wall is not fully finished, it should be extended upwards to the same height; According to the specified reading displayed on the scale instrument (when using a 2m ruler, take the upper reading, and when using a 1m ruler, take the lower reading).
The verticality of the internal and external corners should also be tested: when testing the external corners, it is required that the distance between the measuring ruler and the external corners should not exceed 50mm; When detecting the inner corner, it is required that the distance between the measuring ruler and the inner corner should not exceed 100mm
2. Measuring flatness with a ruler
(1) Measure the flatness of the wall surface: The side of the ruler should be close to the measured surface, and the gap size should be measured using a wedge-shaped feeler gauge. Three points should be tested at each point, namely one vertical point, and one point should be crossed 45 ° left and right in its original position. The average value of the three points should be taken. The correct reading of the flatness value is determined by inserting a wedge-shaped feeler gauge into the maximum gap. However, if the hand is placed in the middle of the ruler plate or both hands are placed at 1/3 of the two ends for testing, the maximum reading should be found within 100mm of the end. In addition, if the hand is placed on one end of the measuring ruler for testing, the flatness of the other end should be measured, and 1/2 of its value should be taken as the actual measurement result.
(2) Measuring ground flatness: When testing ground flatness, the method is basically the same as testing wall flatness, but three points should still be tested at each point, namely one point in the straight direction, and one point should be crossed 45 ° left and right in its original position, and the average value of the three points should be taken. However, when encountering color bands or door openings, they should be inspected through them.
Can a ruler be used to measure slope
A horizontal ruler is generally used to measure verticality and flatness, but in reality, a ruler can also be used to measure slope. The method for measuring slope with a ruler is:
1. Use a suitable length of ruler according to the needs of the inspection surface.
2. When testing, place the horizontal bubble on the ruler facing upwards at the tested surface, and find the lowest end of the slope before slowly lifting it up.
3. At the same time, while checking whether the horizontal bubble is centered, insert a wedge-shaped feeler gauge until the bubble reaches the center. The depth of insertion reflected on the feeler gauge scale is the level or slope of the detection surface.
