When detecting the external corner, the distance between the inspection ruler and the external corner shall be no more than 50 mm; When detecting the internal corner, the distance between the ruler and the internal corner shall not be more than 100 mm.
The correct reading of the flatness value of the wall is determined by inserting a wedge feeler gauge into the maximum gap.
It is still that three points should be detected at each point, that is, one point in the straight direction, and one point at the left and right intersection of 45 ° in its original position, and the average value of the three points should be taken.
The inspection method is the same as above.
The verticality of the internal and external corners of the advanced finishing works shall also be tested in the verticality scale instrument demonstration drawing.
4.
Measure the flatness of the wall after subtracting 100mm from the end.
Refer to the demonstration diagram for detection.
Pull a 5m long line from the small wire box, and pull a through line less than 5m.
1.
However, the specified reading should be displayed according to the scale instrument, that is, when using a 2m measuring ruler, the above reading should be taken; When using a 1m measuring ruler, take the following readings, see the demonstration diagram.
Therefore, the construction supervision who bears the heavy responsibility of supervision work must have good professional ethics.
However, if the plinth or finish under the wall is not finished to the end, it should be extended to the same height.
Check the ground levelness or slope in the bubble after using a 1m measuring ruler.
If the measured surface is not flat, it can be detected with the right upper and lower feet (the middle foot should not be rotated out).
Refer to the demonstration diagram for detection.
Calibration method of instrument pointer deviation.
(The verticality test method of brick masonry, concrete shear wall, frame column and other structural works is the same as above).
When testing, place the horizontal bubble on the measuring scale upward at the surface to be tested, find out the lowest end of the slope, and then slowly lift this end, while checking whether the horizontal bubble is in the center, insert a wedge feeler gauge, until the bubble reaches the center, the filling depth reflected on the scale of the feeler gauge is the levelness or slope of the testing surface.
Vertically detect the flatness of the wall by 45 ° to the left and 45 ° to the right.
The standard can be self-made Install a horizontal square wood or aluminum profile with a length of about 2.1 meters vertically on the wall, adjust it vertically by the plumb line, place the inspection ruler on the standard horizontal object, and use a cross screwdriver to adjust the “S” screw of the level pipe to make the bubble center.
Use method of small wire box, steel ruler and wedge feeler gauge The steel ruler is the simplest length measuring tool, and its length is 150300500 and 1000mm.
However, if the hand is placed in the middle of the guiding rule plate, or the two hands are placed at 1/3 of the two ends respectively, the maximum reading should be found within 100 mm of the end minus; Refer to the demonstration diagram for detection.
The difference is that when there are color bands and door openings, they should be tested.
Push down the instrument cover when it is used for 1m detection.
In the straight direction, the ground flatness is measured by 45 ° to the left and 45 ° to the right through the color band flatness detection demonstration diagram.
Use method of inspection ruler (guiding rule) The inspection ruler is a deployable structure with a folding length of 1 meter and a spreading length of 2 meters.
Figure 2-2 is a commonly used 150mm steel ruler.
3.
Fixing Socket Waved End Nail Plate
1.
Three points shall be detected at each point, that is, a vertical point, and one point shall be crossed at 45 ° left and right at its original position, and the average value of the three points shall be taken.
During the inspection of 2 meters, expand the measuring ruler and lock the connecting buckle.
If the value deviation of the instrument pointer is found during vertical detection, the measuring ruler should be placed on the standard for calibration and adjustment.
The levelness or slope detection depends on the length of the detection ruler required for the detection surface to determine whether to use a 1m detection ruler or a 2m detection ruler.
Of course, the closer it is, the more representative it is.
Refer to the demonstration diagram for detection.
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The wall verticality detection is carried out with a 2m measuring ruler, which is located on the wall with the same waist height.
Read the value of the upward scale indicated by the pointer directly.
Check the ground levelness or slope demonstration map with a 1m measuring ruler.
Use a 2m measuring ruler and a feeler gauge to check the ground slope demonstration map.
Three people cooperate in the inspection, two people pull the line, and one person uses a steel ruler to measure the maximum deviation between the joint and the small line.
5.
The small wire box and steel ruler are used together to detect the straightness of the wall panel joint.
Refer to the demonstration diagram for detection.
The levelness and slope of the table with small size or pipe with small length and size can also be tested with a measuring ruler.
Refer to Figure 1-13, Figure 1-14, Figure 1-15 and Figure 1-16 for detection.
Use a 2m measuring ruler to check the ground levelness or slope demonstration map.
(The flatness test method of brick masonry, concrete shear wall and other structural works is the same as above, but the difference is that the flatness of the front and side of the tested concrete column is tested at two places in each oblique direction).
If you place your hand on one end of the measuring ruler for testing, measure the flatness of the other end, and take 1/2 of its value as the measured result.
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Push the movable pin push key upward, and close the left side of the measuring ruler to the measured surface.
When detecting the flatness of the wall, the side of the measuring ruler shall be close to the measured surface, and the gap size shall be measured with a wedge feeler gauge (refer to 2.4 wedge feeler gauge).
The ground flatness is measured by subtracting 100 mm from the end of the ground flatness.
2.
Other methods shall be tested according to Article 1.2.
Demonstration diagram of verticality detection and amplification demonstration diagram of verticality detection When the wall height is less than 2m, a 1m long measuring ruler can be used for detection.
This value is the 2 meter perpendicularity deviation of the measured surface, and each grid is 1 mm.
When detecting the ground flatness, the method is basically the same as that of detecting the wall flatness.
