First of all, the method of making a single elbow
1. First, according to the actual situation, determine the name of the prefabricated elbow, measure the values of A and C, and calculate the value of α:
α=arctg(c/a)
2, and then calculate the blanking size x:
x=2b*tg(2/α)
Second, the method of making any corner elbow of multilayer cable bridge with equal spacing and equal height
1, making the first layer elbow:
The method of two elbows on the first floor is the same as the elbow method in "I" The distance between the two elbows is determined on site, but it must meet the requirements of cable bending radius.
2, making the second layer elbow:
(1) Calculate the positioning dimension e of the first elbow of the second-floor bridge. First measure the positioning dimension d of the bridge on the first floor, that is, e=d+b*tg 1/2α.
(2) The 1 notch α of the second-layer elbow shall be made according to the "one" method;
(3) Calculate the c value of the distance between two elbows:
c=2b*tg( 1/2α)
(4) manufacturing the second notch alpha of the second layer elbow according to the "one" method;
(5) Calculate the compensation dimension h: h = 2b * (TG 1/2α).
3, making the third layer elbow:
The manufacturing method is the same as that of the second layer elbow, with f=e+b*(tg 1/2α) and g = 2b * (TG1/2α)+C.
Third, the practice of multi-layer zigzag elbow:
Its practice is similar to "two", except that the values of A, C and G are equal, and the two α angles are tangent to both sides of the bridge.
1, general connection mode of elbow
In the piping system, the elbow is a pipe fitting that changes the direction of the pipeline. According to the angle, there are three most commonly used types: 45 and 90180, and other elbows with abnormal angles, such as 60, are also included according to the engineering needs. Elbows are made of cast iron, stainless steel, alloy steel, malleable cast iron, carbon steel, nonferrous metals and plastics.
The ways to connect with the pipeline are: direct welding (the most commonly used way) flange connection, hot melt connection, electric melt connection, threaded connection and socket connection. According to the manufacturing process, it can be divided into welding elbow, stamping elbow, pushing elbow, casting elbow and butt welding elbow. Other names: 90-degree elbow, right-angle elbow, etc.
2, the classification of cable tray
Cable tray is divided into trough, tray, ladder and net structure, which consists of bracket, support arm and installation accessories. The bridge in the building can be erected independently, and can also be laid on various buildings and pipe gallery supports, which should reflect the characteristics of simple structure, beautiful appearance, flexible configuration and convenient maintenance. All parts need to be galvanized and installed outdoors.
Baidu encyclopedia-elbow
Baidu encyclopedia-electric cable bridge