塔吊说明（Tower crane instruction）.doc

塔吊说明（Tower crane instruction） The crane (tower crane) tip function is to bear arm and balance arm pull rope pull rope from the upper load, and through rotating tower turret bearings and other structural components style passing directly through the turret to the tower structure. Self lifting tower with truncated cone column, forward or backward truncated cone column, herringbone frame and bracing frame. All overhead tower cranes need to be equipped with counterweight, which is used to support counterweight, which is used to form the balance moment in the opposite direction of the lifting torque. In addition to the counterweight, the lifting mechanism is often installed at the rear end. The lifting mechanism is together with the balance weight placed on the balance arm end, a department can play a balancing effect is increased, the two rope reel and the spire of the distance between the guide wheel and the wire rope winding rope and to avoid chaos phenomenon. The amount of balance weight and balance arm length is inversely proportional to the relationship, and the balance arm length and up and there is a certain relationship between the proportion of arm length. Balance weight is considerable, light tower crane generally need at least 3 ~ 4T, heavy to nearly 30t. 2 development edit From the development of the tower crane industry, the industry is closely related to the national economy, construction / real estate, and therefore, from the national classics Tower crane (2 pieces) With the development trend of the real estate industry, the development of tower crane industry is of scientific significance. In 2010, Chinese economy continued since 2009 rebound trend, laid a good foundation for the development of various industries, the real estate industry will rise rapidly, the crane industry also increased significantly, according to the China Construction Machinery Association statistics, 2010 sales exceeded 40 thousand units of tower crane. In 2011, the market scale o