High-pressure grouting prestressed pipe pile and construction method

The invention discloses a high-pressure grouting prefabricated pipe pile and a construction method, which are mainly used in the field of pile foundations in constructional engineering, greatly improve the bearing capacity of the pile foundations, and are high in construction speed and low in comprehensive unit price. The pipe pile mainly comprises a pipe pile body, a grouting device and a pile tip. The construction method comprises the following steps of: hammering or statically pressing each section of tubular pile to a designed elevation in sequence by using a conventional method, then placing a high explosive in the cavity of the pile tip, filling cement mortar into the through hole A, then detonating the high explosive, reaming the bottom of the tubular pile by the exploded high explosive, then installing a grouting device, and finally, grouting the bottom of the tubular pile by using the grouting device. Applying pressure to a grouting piston of the grouting device by using a pile hammer of a pile drive