The base for the steel unit includes a support tube, bottom plate and platform and at least one girder. The bottom plate is connected to the lower end of the support tube, and the bottom plate is formed with a plurality of support holes. The platform is connected to the top of the support tube, and the platform has fastening holes near four corners. Thereby at least one girder can be placed on the platform in one end, and one end of the girder is fastened to the fastening hole of the platform. Thus, the desired impact resistance is achieved so that the elevated floor has good impact resistance and the safety of the structure is improved.
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