Telescopic supporting beam and internal climbing tower crane

The utility model discloses a telescopic supporting beam and an internal climbing tower crane, the telescopic supporting beam comprises a fixed part and telescopic parts, the telescopic parts are arranged at the two ends of the fixed part, the length of the telescopic parts extending out of the fixed part can be adjusted, and a driving part is arranged between the telescopic parts and the fixed part. In the application, after the height of the tower crane body is increased, the telescopic supporting beam is connected with the lifting mechanism of the tower crane body, the telescopic parts at the two ends of the fixed part are shrunk towards the center of the fixed part, so that the overall length of the telescopic supporting beam is shrunk to be smaller than the inner span of the core tube from being larger than the inner span of the core tube, and the telescopic supporting beam is separated from a hole in a shear wall; under the action of the lifting mechanism, the telescopic supporting beam is lifted to the