Beam-slab integrated prefabricated waffle slab structure and construction method thereof

A beam-slab integrated prefabricated waffle slab structure, comprising:

• columns (1), arranged in an array;
• wherein a beam and slab support element (11) and a beam support element (12) are disposed on an upper end of each of the columns (1);
• prefabricated frame beams (2);
• wherein a cross section of each of the prefabricated frame beams (2) is rectangular, two ends of each of the prefabricated frame beams (2) are respectively disposed on the beam support elements (12) of adjacent columns (1) on left and right sides of each of the prefabricated frame beams (2), and a main support element (4) is disposed on front and rear sidewalls of each of the prefabricated frame beams (2);
• prefabricated waffle beam-slab units (3), each comprising a reinforced concrete slab (31);
• wherein ribbed beams (32) are respectively disposed on left and right sides of the reinforced concrete slab (31) and are disposed facing upwards and extend forwards and backwards, and the reinforced concrete slab (31) defines through-holes (33) arranged in an array;
• annular rebars (34) extending out of the reinforced concrete slab (31) are disposed on front and rear sides and left and right sides of any one of the through-holes (33), and the annular rebar (34) between any adjacent two of the through-holes (33) is the same;
• an upper end of each of the through-holes (33) is provided with a cylindrical inner mold (35) to obtain array arranged cylindrical inner molds (35);
• a pre-embedded steel plate (36) is disposed on each of inner sidewalls of front and rear ends of each of the ribbed beams (32);
• and one of the ribbed beams (32) of each of the prefabricated waffle beam-slab units (3) is disposed on the beam and slab support elements (11), and another of the ribbed beams (32) of each of the prefabricated waffle beam-slab units (3) is disposed on the main support elements (4) of two mutually parallel prefabricated frame beams (2);
• wherein each of the ribbed beams (32) is provided with beam stirrups (321), and the beam stirrups (321) extend out of an upper surface of each of the ribbed beams (32), and are arranged in a front to back sequence;
• and a post-installed ribbed beam top rebar skeleton (5) is disposed on an adjacent two of the ribbed beams (32) of two of the prefabricated waffle beam-slab units (3);
• wherein a top surface of each of the prefabricated frame beams (2) defines a groove (21) extending along a length direction of each of the prefabricated frame beams (2);
• each of the prefabricated frame beams (2) is provided with opening hoops (22) extending out of the groove (21), and is provided with connecting rebars (23) extending out of front and rear sides of each of the prefabricated frame beams (2), the connecting rebars (23) are provided in multiple rows, and the multiple rows of the connecting rebars (23) are arranged in a left to right sequence;
• and each of the prefabricated frame beams (2) is provided with first longitudinal rebars (24) therein, and each of the first longitudinal rebars (24) extends into beam-column nodes of the columns (1) and the prefabricated frame beams (2);
• wherein post-installed main beam top rebar skeletons (6) are disposed on the prefabricated frame beams (2), each of the main beam top rebar skeletons (6) is disposed continuously to cover all of the prefabricated frame beams (2) in a same extension direction, and each of the main beam top reinforcement skeletons (6) and the opening hoops (22) cooperate to form a closed hoop structure;
• wherein an L-shaped connecting element (9) is disposed between the pre-embedded steel plate (36) and a corresponding one main support element (4), and the L-shaped connecting element (9) is welded with the pre-embedded steel plate (36) and the corresponding one main support element (4);
• in the array arranged cylindrical inner molds (35), horizontal slab rebars (7) are disposed between horizontal gaps of the array arranged cylindrical inner molds (35), and longitudinal slab rebars (8) are disposed between longitudinal gaps of the array arranged cylindrical inner molds (35);
• wherein concrete is poured on site at the beam-column nodes of the columns (1) and the prefabricated frame beams (2), at the ribbed beam top rebar skeletons (5), at the main beam top rebar skeletons (6), at the horizontal slab rebars (7) and at the longitudinal slab rebars (8), and the poured-on-site concrete is configured to cover the ribbed beam top rebar skeletons (5), the main beam top rebar skeletons (6), the horizontal slab rebars (7) and the longitudinal slab rebars (8);
• wherein the main support element (4) comprises two anchor plates (41), shear resistant steel plates (42), a connecting bottom plate (43) and vertical steel plates (44);
• the shear resistant steel plates (42) are fixed to an inner side surface of each of the two anchor plates (41), and the two anchor plates (41) are respectively disposed on front and rear side surfaces of each of the prefabricated frame beams (2);
• bottoms of the two anchor plates (41) are connected by the connecting bottom plate (43);
• and the main support element (4) and each of the prefabricated frame beams (2) are integrally cast and molded;
• and
• wherein front and rear edges of the connecting bottom plate (43) each extend out of the front and rear side surfaces of each of the prefabricated frame beams (2);
• each of the vertical steel plates (44) is connected to a middle of the connecting steel plate (43) and is connected to an outer side surface of each of the two anchor plates (41) to form an inversed T-shaped support structure, to thereby make two sides of each of the vertical steel plate (44) respectively support the ribbed beams (32) of corresponding reinforced concrete slabs (31).