Due to the requirements of mechanical characteristics, the lifting ring should be made of HPB235 grade steel bar without cold drawing. It is forbidden to use other steel bars instead. Each lifting ring is calculated in two parts. Under the weight standard of components, the stress of lifting rings should not be greater than 50n/mm2, and the dynamic coefficient of components has been considered in this range. When there are four rings on a component, only three rings need to be considered simultaneously in the design.
The lifting ring also has the function of large crack area, and through the treatment process in construction, the structural performance of steel structure which is easy to be stabilized in tensile treatment is strengthened; The construction performance is high. In the summary of the structural use of mixed steel bars, it is strengthened to avoid the occurrence of pipeline rupture, prevent the dangerous situation of hanging objects under the action of gravity, and also strengthen the high bearing capacity in the construction process.
Pay attention when using steel rings.
1, the construction site should record the use of all steel rings for inspection and maintenance, and pay attention to safety protection measures. The installation position of the steel ring should be located in the center of the component, and the appropriate hoisting method should be selected according to the weight and size of the hoisting object to ensure the safety and reliability of hoisting.
2. During hoisting, attention should be paid to the displacement and stress, to ensure that the hoisted object is stable and free from shaking, and at the same time, pay attention to check whether there are cracks and deformations in the rings.
3. When hoisting special components, auxiliary devices such as gaskets should be installed on the steel ring according to the actual situation to ensure that the components are not damaged during hoisting.