A centering device and controllable separation method of bond-damping uplift pile using the same

Abstract

This invention relates to the field of anti-tension pile construction technology, providing a centering device and a controllable separation method for slowly bonded anti-tension piles using the same. It includes a separation sleeve, with at least three anchor bars hinged to the outer peripheral wall of the sleeve near its top via a pivot. Each anchor bar is elastically connected to the outer periphery of the bottom end of the sleeve via a spring. The advantages are: during construction, the anchor bars press against the inner surface of the steel pipe, limiting the steel strands at multiple points circumferentially, ensuring that the axis of the steel strands always coincides with the axis of the steel pipe during the lifting process. For long piles, construction can be completed in one go. Combined with the elastic restoring characteristics of the springs, it can offset vibration and friction interference during construction, avoid displacement of the centering structure, prevent localized stress concentration in the concrete caused by uneven stress on the steel strands after pile formation, significantly improve the overall anti-tension performance and structural stability of the slowly bonded anti-tension pile, and extend the service life of the pile.

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