The track foundation of portal crane is an important guarantee for its stable operation, which is related to the safety and efficiency of crane operation.
First of all, the track foundation design requires sufficient bearing capacity. It must be able to withstand multiple loads such as the crane's own weight, lifting heavy objects, and dynamic loads during operation. When designing, it is necessary to accurately calculate the size of the foundation, reinforcement, and strength grade of concrete based on the maximum lifting weight, span, and running speed of the crane. For example, for large portal cranes, the foundation may need to use a deeper concrete pile foundation to ensure that it can stably support huge pressure.
Secondly, the flatness of the track foundation is extremely high. The height difference of the track surface directly affects the stability of the crane trolley operation, which is easy to cause rail gnawing, increase the wear of the track and wheels, and even cause safety accidents. The flatness tolerance range of the track installation should be strictly specified during the design, and high-precision measuring instruments should be used for monitoring and adjustment during the construction process.
In addition, the track foundation must have good stability. Surrounding environmental factors such as soil conditions and groundwater levels should be taken into account. In areas with soft soil foundations, reinforcement measures such as foundation treatment and geogrid laying are required to prevent the foundation from tilting or sinking during long-term use.
There are many strategies to deal with the settlement problems that may occur in the track foundation. The first is preloading treatment. After the foundation construction is completed but before the track is installed, preloading is carried out for a certain period of time to simulate the load conditions of the crane operation, so that the foundation can complete part of the settlement in advance, thereby reducing the amount of settlement in subsequent formal use.
The second is to set up settlement observation points and monitor them regularly. Observation points are arranged at key parts of the track foundation, and instruments such as levels are used regularly to measure their elevation changes. Once the settlement rate is found to be abnormal or the settlement exceeds the allowable range, timely measures should be taken, such as adjusting the track height and grouting reinforcement of the foundation.
The third is to use an adjustable track system. This track system can flexibly adjust the height within a certain range. When slight settlement occurs, it can be easily compensated to ensure that the crane operation is not affected, and at the same time buy time for the subsequent treatment of the foundation.
Finally, in the design and construction process of the track foundation, relevant standards and specifications, such as the "Crane Design Specifications", must be strictly followed. In addition, we will work with multiple professionals such as structural engineers and geotechnical engineers to comprehensively consider various factors and create a solid and reliable track foundation to ensure the safe and efficient operation of portal cranes.
