Not less than C35. Equipment foundation maintenance comes from Technical Specification for Concrete Foundation Engineering of Tower Crane, and the strength grade of concrete before installation is required to be no less than C35.

1. During installation, the foundation must be compacted and the concrete strength grade should be high.

2. During installation, the top surfaces of all anchor bolts must be on the same horizontal plane.

3, after the installation is completed, the foundation concrete pouring should be water conservation, so that the concrete design strength inspection.