Whether it is rural fields or roads and streets, concrete telephone poles can be seen everywhere. But it’s such a piece of infrastructure, not as simple as it seems, , do you know how it is made?
Early electric poles started from wooden poles. Later, with the development of steel and concrete, the most common cement poles were made today. It is durable, corrosion-resistant and high-temperature resistant, as well as high-strength anti-cracking characteristics, which has become a benchmark in the new era. Perhaps you have always thought that such poles are solid, , but the fact is that they are all hollow . Why?
Because of the same material, the diameter of the hollow tube is larger than that of the solid tube, and the hollow has a greater moment of inertia, and the bending performance is better. , This is actually a natural law. For example, the wheat stalk is also hollow, so that it can resist strong wind, and the fishing rod is also hollow, so that it can bear a greater pulling force to prevent it from being broken.
So the small telegraph poles actually contain quite complicated manufacturing processes. is the steel cable that runs through the end and end of the interior. It needs to be gradually tightened under the action of the stress gun, so that the steel cable can maintain a certain load force, thereby enhancing the overall rigidity and crack resistance of the pole. Then use the seat ring to fix these steel bars. At this time, the internal skeleton of the entire telegraph pole is roughly completed.
Next, hoist the mold with the skeleton to the concrete spreader , the machine will move,While pouring the pre-configured cement mortar into the mold. These cement mortars have very low water content and have good shaping characteristics. At this time, workers will manually scrape the surrounding cement with a shovel, and then rinse the edges of the mold, and then lift the other half of the mold to cover it. Above, so that the two can be buckled together tightly.
Then tighten the steel cable buried in the cement mortar again , wait for the concrete to harden, and then it will be firmly integrated with the steel cable. Then comes the most important step. Put the assembled mold on the centrifuge to start shaping. As the centrifuge rotates at a high speed of 500 revolutions per minute, the excess cement mortar on the mold will be thrown into the inner wall of the mold.
Then put the formed electric pole mold into the steam curing room for curing for a few hours, then the mold can be demolded , and now a cement electric pole is finished. But seeing this, a new question has appeared, why does have to make the electric poles round?
The main reasons are as follows: First, the of the circular pole is better than the square . The circular cross-section has a higher bearing capacity in all directions. Second, compared to , the circular pole is more material-saving . From a circle to a polygon and then to a square, the larger the product coefficient, the larger the area. Finally, the circular pole is more beautiful and safer than , if you accidentally hit the pole, I believe that the curved pole will feel better than the angular one. But it’s not that there are no square poles at all,For example, the telephone poles next to the railway are square.
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