The stability of single beam crane foundation is very important

[BONOVO]

Single beam crane (rotary arm crane) is a powerful lifting and transportation equipment, which is widely used in construction, transportation and other industries. The double beam crane mainly includes lifting mechanism, operating mechanism, amplitude changing mechanism, rotating mechanism and metal structure.

Lifting mechanism is the basic working mechanism of the crane, mostly composed of hanging system and winch, but also through the hydraulic system lifting heavy objects. The crane to turn the boom is composed of a driving device and a slewing support device. The metal structure is the skeleton of the crane, the main bearing parts such as bridge, boom and gantry can be box structure or truss structure, can also be web structure, and some can be used as supporting steel beams.

The intelligent crane is a multi-action lifting machine that lifts vertically and carries heavy objects horizontally within a certain range. [1] The work is characterized by intermittent movement, that is, the corresponding mechanism of taking material, migration, unloading and other actions in the more work cycle is alternately working, and the development and use of cranes in the market is more and more extensive. Because it is composed of a huge steel structure, the stability of the single beam lifting foundation is more important. The collapse of column type single beam crane occupies a large proportion in single beam crane accidents, which is caused by unqualified single beam crane foundation. Then, in order to avoid the occurrence of tower crane accidents, what problems should be paid attention to in the construction of single beam crane foundation

According to the analysis of the production and use management experience data of the single beam crane, the causes of the single beam crane foundation engineering accidents fall into the following three categories:

In order to seize the construction period, some construction sites were hastily installed under the condition of insufficient concrete strength, resulting in the bearing capacity of the tower crane exceeding the ground stress limit, resulting in unfortunate collapse and overturn accidents.

2. In some construction units, the excavation near the tower crane foundation causes a very large displacement of the landslide, resulting in tower crane accidents

Third, due to the development of China in recent years, many different cities in Chinese society due to excessive groundwater extraction, affecting the groundwater funnel, which can lead to uneven settlement, affecting the operation and construction of single beam crane.

Therefore, in order to prevent the collapse of the single beam lifting accident, the construction enterprise unit can do the single beam lifting foundation, it must be able to ensure that the ground endurance meets the technical requirements of the teaching design, and the strength of the reinforced concrete is less than 80% of its design value.

The basic knowledge of tower cranes with basement construction projects should also be adopted by taking more special treatment methods: such as driving piles under the learning foundation, and welding the steel bars at the pile end firmly with the foundation bolts. The bottom surface of the concrete structure foundation should be smooth and compacted, and the bottom of the foundation should not be made into a pot bottom. We can establish strict management in accordance with the requirements of the economic foundation map to improve the construction, anchor bolts to maintain sufficient length of the students exposed to the ground, each anchor bolt to double nuts pre-tightened. Before installation, the surface problems of social basic research should be analyzed and treated to ensure that the levelness of the information base cannot exceed 1/1000. At the same time, the basic education of the tower crane should not collect water, which will cause the uneven settlement of the tower crane foundation. No pits or ditches shall be dug at will in the vicinity of the single beam crane infrastructure.

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