Construction method for a building

A method for constructing a building, the method comprising the steps of:

• (a) hoisting and positioning a plurality of first precast columns that are one story tall onto at least one portion of a predetermined construction area on a construction site to form a first precast column array having at least two spans along a first direction and having one or more spans along a second direction substantially perpendicular to the first direction;
• (b) hoisting and positioning a plurality of pre-fabricated beam rebar assemblies so that each of the plurality of pre-fabricated beam rebar assemblies is positioned between each predetermined two adjacent first precast columns;
• and further hoisting and positioning a plurality of precast slab panels so that each of the plurality of precast slab panels is positioned between each predetermined four adjacent first precast columns, and then completing a beam rebar cage between each predetermined two adjacent precast columns;
• (c) pouring concrete into molds surrounding the beam rebar cage to form a beam between each predetermined two adjacent first precast columns;
• (d) end-to-end jointing each of a plurality of second precast columns that are at least one story tall respectively to each of the plurality of the first precast columns of the first precast column array respectively, wherein the first precast columns of the first precast column array positioned along the second direction at an end of the first direction are not jointed with a second precast column, so as to form a second precast column array having one fewer spans than those of the first precast column array along the first direction and having one or more spans along the second direction;
• (e) proceeding with the following steps on the plurality of the second precast columns story by story from a lowest story to a highest story thereof:
• (i) hoisting and positioning a plurality of pre-fabricated beam rebar assemblies so that each of the plurality of pre-fabricated beam rebar assemblies is positioned between each predetermined two adjacent second precast columns;
• and further hoisting and positioning a plurality of precast slab panels so that each of the plurality of precast slab panels is positioned between each predetermined four adjacent second precast columns, and completing a beam rebar cage between each predetermined two adjacent second precast columns;
• (ii) pouring concrete into molds surrounding the beam rebar cage to form a beam between each predetermined two adjacent second precast columns;
• (iii) repeating step (i) to step (iii) until the construction work on the structure of the highest story of the plurality of the second precast columns is completed;
• (f) taking the first precast columns positioned at the end of the first direction and along the second direction as the starting points of the span along the first direction and then hoisting and positioning a plurality of first precast columns having one story to form a next first precast column array having at least one span along a first direction and having one or more spans along a second direction being substantially vertical to the first direction, and repeating step (b) to step (e) until all the first and second precast columns and the precast slab panels of the building are positioned.