The height of the tower crane before attachment is called the free height L, and the larger free height of tower cranes of different grades and models is also different. Generally speaking, the higher the level, the higher the free height of the tower crane. Due to the different site conditions of construction projects, some situations are very special. For example, in order to avoid obstacles such as existing buildings, trees, and high-voltage lines, the initial installation height of the tower crane must exceed these obstacles. At this time, the building has not been built to a certain height, and it is impossible to enhance the stability of the tower crane by setting attachment points on the building.
In view of the problems existing in the installation of tower cranes in the prior art, technicians provided a new type of tower crane's tower structure, including an inner tower and an outer tower, and the lower ends of the inner tower and the outer tower were fixed on the tower. On the basis of installation, the outer tower is sleeved outside the inner tower, and the inner tower and the outer tower are fixedly installed together. The tower body is fixed with the inner tower body through a connecting device. The connecting device connects and fixes the main limbs corresponding to the inner and outer towers, and fixes the inner and outer towers together.
Since the main factor affecting the greater free height of the tower crane is the strength of the tower crane, the greater free height of the tower crane can be increased by increasing the strength of the tower. According to the tower crane of the present invention, the inner (original) tower is surrounded by a tower with larger strength and size. The inner and outer towers are connected by a connecting device to form a part of the double tower, which can greatly strengthen the entire tower. Strength, so as to achieve the problem of increasing the greater free height of the tower crane.
