The assembly of the shield machine is a reloading workshop. The scale of more than 300 meters, 72 meters wide and more than 30 meters makes the reloading workshop the largest workshop in Liaoning Province. The shield machine with a diameter of 11.38 meters "lie down" in the reloading workshop.
How did such a huge thing be transported to the construction site? Only removed. Usually, when the cutter is used, there is a police car escort, and there must be a pilot car. There must be a van at the front. "The worker sitting in the van has to carry the gas welding tool. When the truck passes the toll booth, the worker uses the gas welding to dismantle the railing of the toll gate. Sometimes, if you can't get through, you have to remove the toll booth. Waiting for the car to go over and repair it, there is no other way," said a staff member at the scene.
Chief engineer Zhao of the on-site construction said: "The working time limit of the general shield machine is 10,000 working hours. When encountering different geology, the speed of advancement will be different, so the mileage of work is uncertain. But this shield machine can work. More than 20 kilometers."
This shield machine is the first shield machine produced in Shenyang City and produced for the Wuhan River Crossing Tunnel Project. The shield machine used in the Shenyang Metro Project has not yet been tendered.
Chromium(III) sulfate usually refers to the inorganic compounds with the formula Cr2(SO4)3.x(H2O), where x can range from 0 to 18. Additionally, ill-defined but commercially important "basic chromium sulfates" are known. These salts are usually either violet or green solids that are soluble in water. It is commonly used in tanning leather.
Since 33% of the anion charges are due to hydroxy ions the basicity is 33% (but in tanning jargon it is known as 33% reduced). Products with higher basicities, e.g. 42% or 50% may be obtained by the addition of sodium carbonate, these are often used in combination with Sodium Formate. The sodium sulfate is often left in the technical product since it is inert with respect to the tanning process. It is important to fully reduce the hexavalent chromium to trivalent since the hexavalent is more likely to cause health problems for tanners and leather consumers.
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