A method of introducing a prestress into a concrete pile

摘要

The present invention is a method for reinforcing the weak points of concrete piles and utilizing concrete piles economically and usefully.;In the past, concrete piles are often destroyed by the impact of hitting, which is uneconomical and difficult to manage.;The reason for this is that the tensile stress of the weak concrete is considered to be caused by the tensile stress of the concrete, and the method of introducing the prestress by the high strength steel material from the outside has been developed in order to make the reinforcement economical.;In order to prevent tensile failure of the pile by the conventional method, additional reinforcement is required and this method can not prevent tensile cracking of the outer reinforced concrete.;This new method is to introduce prestress only where it is needed.;That is, in the conventional case, especially when the pile hovering is performed near the last, a lot of fracture phenomenon occurs.;The pressure strap can be attached to the pile as it is disposable, or it can be used continuously.