Reinforced recycled lump/aggregate concrete precast column and construction method thereof

A reinforced recycled lump/aggregate concrete precast column, comprising a plurality of first one-bar confinements, longitudinal bars, a plurality of second one-bar confinements, a plastic hinge region, and recycled lump/aggregate concrete;

• each of the first one-bar confinements and each of the second one-bar confinements being provided with an anchoring end;
• the plurality of first one-bar confinements and some of the plurality of second one-bar confinements being arranged in the plastic hinge region, and some of the second one-bar confinements being arranged outside the plastic hinge region;
• outer edges of the first one-bar confinements being flush with outer surfaces of the reinforced recycled lump/aggregate concrete precast column, the first one-bar confinements being configured to restrain a concrete cover, and a vertical spacing between two adjacent first one-bar confinements of the first one-bar confinements being not greater than 200 mm;
• the second one-bar confinements abutting against the longitudinal bars, and the second one-bar confinements being configured to restrain the longitudinal bars;
• the anchoring end being formed by bending at 135° twice;
• and
• an interior of the reinforced recycled lump/aggregate concrete precast column being filled with the recycled lump/aggregate concrete, the recycled lump/aggregate concrete consisting of fresh concrete and demolished concrete lumps, and the fresh concrete being recycled aggregate concrete containing recycled coarse aggregates and excavated soil, wherein
• a mass ratio of the recycled coarse aggregates to natural coarse aggregates in the fresh concrete is not greater than 4, the excavated soil partially or completely replaces natural sand, and a mass ratio of the excavated soil to the natural sand is not less than 1
• a strength grade of the fresh concrete is not lower than C40;
• and
• the demolished concrete lumps are lumps formed by breaking old buildings, structures, and roads after removing all or part of steel bars, and a characteristic size of each of the demolished concrete lumps is not less than 60 mm.