On the wire frame, the center wires are connected by thin steel wires, and then the theodolites are set on the observation points and the geometric center line control points on the ground respectively, and the control wires are cast onto the wire rack. The self-made horizontal length ruler requires the tolerance of the center distance of the anchor bolt to ensure the accuracy of the month. With a channel steel, the civil engineering construction management office from the one end of the channel steel uses the steel ruler to accurately measure the distance between the center distances of the bolts. The number of measurements is secondary, and the temperature is corrected, and then the average value is taken. Use a knives to engrave the thin line, which is the horizontal distance between the bolts.
Then take the distance from the left to the right for calibration, engrave the thin line as the center line of the mixed iron furnace and then use the steel ruler to measure the center position of each bolt design on the channel steel in turn. And engraved with a thin line, used as a horizontal length ruler after being verified. A thin steel wire is hung on the extension line of the center line of the two rows of bolts of the bracket beam, so that the two ends are respectively placed on the wire frame beam corresponding to the center line of the beam so as to be parallel with the center line of the bracket beam. Taking the center line of the beam as the reference, the distance between the center line of each distance and the center distance of the bolt is measured, and the error should be within. The method of checking the steel wire of the support beam is composed of two rectangles, and the distance between them should be equal, which is equal to the diagonal length.
The bolt positioning method takes the bolt positioning of a column as an example, and the two ends of the self-made horizontal length ruler are placed on the wire frame beam, and the center line point of the bolt on the support beam is coincident. The height of the bottom surface of the wire frame beam is higher than the height of the top surface of the bolt. Level with a precision level to ensure a horizontal level top surface.
Activated Carbon is a very small carbon particle with a large surface area, and there are even smaller holes in the carbon particle-capillary. This capillary has a strong adsorption capacity, because of the large surface area of the carbon particles, it can be in full contact with gas(impurities). When these gases(impurities) touch the capillary, they are adsorbed and act as purifiers. The study of the surface area of activated carbon is very important. The detection data of the specific surface area of activated carbon is only true and reliable by using the BET method. At present, there are many instruments in China that can only be detected by direct comparison methods. Now it is also in China. It was eliminated. At present, multi-point BET method is used for specific surface area testing at home and abroad. The specific surface area measurement standards formulated at home and abroad are based on BET test methods. See the Chinese National Standard(GB/T 19587-2004)-BET principle for the determination of the surface area of solid substances. The specific surface area detection is actually a more time-consuming task. Due to the different adsorption capabilities of samples, the testing of some samples may take a whole day. If the test process is not fully automated, the testers can not leave at all times. And to be highly focused, observe the dashboard, control the knob, and inadvertently lead to the failure of the test process, which will waste a lot of valuable time for the tester. The F-Sorb 2400 ratio surface area tester is an instrument that can truly achieve the BET method detection function(with a direct comparison method). The more important F-Sorb 2400 ratio surface area tester is the only fully automated and intelligent surface area detection device in China so far., Its test results are highly consistent with international standards and have good stability. At the same time, it reduces human error and improves the accuracy of test results.
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