How to avoid tower crane accident effectively      

In the tower crane accident, tower crane collapse occupies a large proportion, the reason is caused by unqualified tower crane foundation. So, how to effectively avoid the occurrence of the crane accident?

Hanging tower, is a powerful lifting equipment, widely used in the construction, transportation and other industries. Because of the huge steel structure, therefore, is based on the stability of tower crane. According to the crane production and use of empirical analysis, the reason of accident of tower crane foundation has the following categories:

The first part of the site, in order to rush period, in the case of insufficient strength of concrete and hasty installation, so that the crane bearing over the ground stress limit, resulting in collapse, overturning the unfortunate incident.

Second, in some construction units near the tower crane foundation excavation work, leading to landslides and even displacement, lead to tower crane accident.

Third, in recent years, many cities in China due to excessive groundwater extraction, resulting in groundwater funnel, and then lead to uneven settlement, affecting the operation and construction of tower crane.

Therefore, in order to prevent the tower crane collapse accident, the construction unit in the tower crane foundation, must ensure that the ground endurance meets the design requirements, the strength of reinforced concrete at least 80% of the design value.

In addition, the tower crane foundation of the basement project should take special treatment measures, such as piling under the foundation, and the steel reinforcement at the end of the pile and the foundation bolt firmly welded together. The concrete foundation bottom surface should be smooth solid, not into the pot bottom. The foundation bolt size error must be strictly in accordance with the requirements of the basic drawing construction, the anchor bolts to keep enough length of the ground, each anchor bolt to double nut preload. Before installation should be handled on the basis of surface, base to ensure the level of not more than 1/1000. At the same time, the tower crane foundation no water, the water will cause the uneven settlement of foundation of tower crane. No digging or ditching in near the tower crane foundation.

Only when the inspection and protection measures are carried out before construction can the tower crane accident be effectively avoided.