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An internal vibrator operates using a rigid, flexible shaft to effectively transmit vibrational energy into the concrete. This type of shaft is designed to withstand the stresses associated with internal vibration while also providing the necessary flexibility to access various formwork designs and depths when embedding the vibrator into freshly poured concrete.

The rigid aspect ensures that the vibrations generated at the head of the vibrator are efficiently transferred throughout the shaft and into the surrounding material, facilitating proper consolidation of the concrete mix by removing air pockets and ensuring uniform density. The flexibility of the shaft allows for easier maneuverability within tight spaces and around obstacles, enhancing the device’s usability on construction sites.

Other types of shafts, such as hollow shafts, solid shafts, or cable-driven shafts, do not offer the same combination of durability and versatility required in various working environments for internal vibrators. Hence, the rigid, flexible shaft is the optimal choice for effective internal vibration in concrete applications.