How to check the authenticity of tower crane operation certificate?

Go to the website of the local technical and safety supervision bureau, and then go to the special operation certificate to inquire and enter the certificate number. If there is a display name, it is true. Tower crane, also known as tower crane, originated in western Europe. According to records, the first patent for tower crane for construction was issued in 1900. 1905 saw the crane with fixed tower and boom, 1923 made the prototype of modern tower crane, and the first relatively complete modern tower crane appeared in the same year. 1930, Germany has started mass production of tower cranes and used them in buildings.

Tower crane:

Tower crane is the most commonly used lifting equipment in construction sites, also known as "tower crane", which is lengthened section by section and used to hang building materials such as steel bars, wooden beams, concrete and steel pipes. Tower crane is an indispensable equipment in construction site. The function of the tower crane blade tip is to bear the upper load from the boom rope and the balance arm rope, and directly transfer it to the tower structure through the structural components such as the rotary tower, turntable and bearing seat. The top of jack-up tower has truncated cone column, forward or backward truncated cone column, herringbone frame and diagonal support frame.