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.
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.
From the development of tower crane industry, the industry is highly related to the national economy and construction real estate. Therefore, it is of scientific significance to look at the development of tower crane industry from the perspective of national economic trend and real estate industry development trend.