Precast concrete column embedded and fixed end high-pressure grouting construction structure and construction method

The invention provides a precast concrete column embedded and fixed end high-pressure grouting construction structure and a construction method, which belong to the field of building construction. Theprecast concrete column embedded and fixed end high-pressure grouting construction structure includes a precast column, a reducing steel pipe pre-buried inside the precast column in a through manner,an upper prestressed tendon penetrating and connected with the inside of the reducing steel pipe in a through manner, and grouting material grouted inside the reducing steel pipe, wherein the grouting height H of the grouting material is 1/3 of the height of the reducing steel pipe; the lower part of the reducing steel pipe is communicated with a grouting pipe, and the upper part of the reducingsteel pipe is communicated with a grout discharging pipe; the reducing steel pipe includes an upper small pipe diameter steel pipe and a lower big pipe diameter steel pipe both are communicated through welding; the height of th