Prestressed assembled concrete frame-joint connecting structure and constructing method thereof

A method for constructing the prestressed assembled concrete frame-joint connecting structure, comprising a prefabricated concrete column (1), a prefabricated concrete superposed beam (2) and a composite slab (3), wherein

• the prestressed assembled concrete frame-joint connecting structure further comprises a temporary support (4) and a post-tensioned prestressing tendon (5) that are provided under the joint, a energy consuming steel bar (6) and a steel bar (7), wherein the post-tensioned prestressing tendon (5) connects the prefabricated concrete column (1) and the prefabricated concrete superposed beam (2);
• a beam post-poured layer (22) of the prefabricated concrete superposed beam (2) and a slab post-poured layer (32) of the composite slab (3) are integrally poured;
• a beam-column seam between the prefabricated concrete superposed beam (2) and the prefabricated concrete column (1) is filled with a crack pouring binding material (8);
• and
• the energy consuming steel bar (6) and the steel bar (7) are laid into the beam post-poured layer (22) at an upper portion of the prefabricated concrete superposed beam (2), and the energy consuming steel bar (6) is located over the steel bar (7);
• and
• the energy consuming steel bar (6) is provided external to the column and is in a form of partial adhesion, and the energy consuming steel bar (6) has one end that protrudes into the prefabricated concrete column (1) and is connected to an internal-to-column anchoring steel bar (91) via a mechanical-connection connector (92), and the other end that is poured within the beam post-poured layer (22);
• and
• the energy consuming steel bar (6) is nested by a sleeve (63), the sleeve (63) has one end that clings to an outer side wall of the prefabricated concrete column (1), and a length of the sleeve (63) is 4-23 times a diameter of the energy consuming steel bar (6);
• and
• the energy consuming steel bar (6) within the sleeve (63) is a necking section (64), the necking section (64) has a cross-sectional area of 50-90% of a cross-sectional area of the energy consuming steel bar (6), and the necking section (64) extends from a position that has a distance to the mechanical-connection connector (92) of 1-3 times the diameter of the energy consuming steel bar (6) to a tail end of the sleeve (63);
• wherein the method comprises the following steps:
• installing the temporary support:
• according to a design scheme, installing the temporary support (4) on the prefabricated concrete column (1);
• installing the prefabricated concrete column:
• in a hoisting process, adjusting a perpendicularity of the prefabricated concrete column (1) by using the temporary support (4);
• installing the concrete superposed beam:
• hoisting the prefabricated beam (21), and fixing the prefabricated beam (21) over the temporary support (4);
• installing the composite slab:
• hoisting a prefabricated slab (31) of the composite slab (3), and fixing the prefabricated slab (31) to the prefabricated beam (21);
• installing the post-tensioned prestressing tendon:
• laying the post-tensioned prestressing tendon (5) into the prefabricated concrete column (1) and the prefabricated beam (21) of the prefabricated concrete superposed beam (2);
• filling the beam-column seam:
• filling the high-strength crack pouring binding material (8) into the beam-column seam between the prefabricated concrete superposed beam (2) and the prefabricated concrete column (1), wherein a width of the beam-column seam is 10-30 mm;
• tensioning the post-tensioned prestressing tendon:
• after the binding material within the beam-column seam has reached a required strength, tensioning the post-tensioned prestressing tendon (5), and fixing;
• laying the bending-resistant energy consuming steel bar and the shearing-resistant high-strength steel bar:
• laying the bending-resistant energy consuming steel bar (6) and the shearing-resistant high-strength steel bar (7) at a position of the prefabricated concrete superposed beam (2) where the beam post-poured layer (22) is to be poured, and connecting one end of the bending-resistant energy consuming steel bar (6) and one end of the shearing-resistant high-strength steel bar (7) to the prefabricated concrete column (1);
• and
• pouring the post-poured layers:
• integrally pouring the beam post-poured layer (22) of the prefabricated concrete superposed beam (2) and the slab post-poured layer (32) of the composite slab (3) in site, and after the poured concrete structure has reached a required strength, performing maintenance.