Precast concrete column with embedded recycled component and construction method therefor

Abstract

A precast concrete column includes recycled components, column longitudinal steel bars, spiral stirrups, ordinary or composite stirrups, first connectors, second connectors, fresh concrete, and grouting sleeves. The recycled component includes old stirrups, old longitudinal steel bars, and old concrete. A height and a width of the recycled component are respectively less than those of the precast concrete column. A volume of the recycled component is not less than 40% of a volume of the precast concrete column. The column longitudinal steel bar is located within the fresh concrete. The ordinary or composite stirrup is in an area where the grouting sleeve is located. The spiral stirrup is in an area where the grouting sleeve is not located. The second connector connects the old longitudinal steel bar and the column longitudinal steel bar. Apart from the interior of the grouting sleeve, the fresh concrete is cast around the grouting sleeve.

What is claimed is: 
     
         1 . A precast concrete column with an embedded recycled component, comprising recycled components, column longitudinal steel bars, spiral stirrups, ordinary or composite stirrups, first connectors, second connectors, fresh concrete, and grouting sleeves, wherein
 the recycled components are enclosed by the fresh concrete, the recycled component comprises an old stirrup, an old longitudinal steel bar, and old concrete, a height and a cross-sectional width of the recycled component are respectively less than a height and a cross-sectional width of the precast concrete column, and a volume of the recycled component is not less than 40% of a volume of the precast concrete column;   the column longitudinal steel bar is located within the fresh concrete;   the grouting sleeve is located below the recycled component;   an arranging range of the ordinary or composite stirrup is an area where the grouting sleeve is located;   an arranging range of the spiral stirrup is an area where the grouting sleeve is not located;   the first connector is made of a steel bar and is configured to connect the old stirrup and the column longitudinal steel bar, and an arranging range of the first connector is an area where the recycled component is located;   the second connector is made of a steel bar and is configured to connect the old longitudinal steel bar and the column longitudinal steel bar; an arranging range of the second connector is an upper longitudinal range of 0-500 mm and a lower longitudinal range of 0-500 mm within an area where the recycled component is located; and   apart from the interior of the grouting sleeve, the fresh concrete is cast around the grouting sleeve, and above, below, and around the recycled component, and the fresh concrete is natural aggregate concrete or recycled aggregate concrete with a maximum coarse aggregate particle size not greater than 20 mm, or recycled aggregate concrete containing recycled sand from excavated soil from construction sites.   
     
     
         2 . The precast concrete column with the embedded recycled component according to  claim 1 , wherein a net distance between a lower surface of the recycled component and the grouting sleeve is 50-100 mm. 
     
     
         3 . The precast concrete column with the embedded recycled component according to  claim 1 , wherein a cross-sectional width of the recycled component is at least 150 mm less than a cross-sectional width of the precast concrete column. 
     
     
         4 . The precast concrete column with the embedded recycled component according to  claim 1 , wherein the recycled component is obtained by removing a stirrup protective layer and performing surface roughening treatment on an old concrete component dismantled from an old buildings or other old structures. 
     
     
         5 . The precast concrete column with the embedded recycled component according to  claim 1 , wherein a compressive strength of the fresh concrete is not less than the compressive strength of the old concrete in the recycled component. 
     
     
         6 . The precast concrete column with the embedded recycled component according to  claim 1 , wherein the first connector clasps the column longitudinal steel bar from an outer side of the column longitudinal steel bar, and the first connector is welded to the old stirrup. 
     
     
         7 . The precast concrete column with the embedded recycled component according to  claim 1 , wherein a yield strength of a steel bar of the first connector is not less than a yield strength of the old stirrup. 
     
     
         8 . The precast concrete column with the embedded recycled component according to  claim 1 , wherein the second connector is welded to the old longitudinal steel bar and the column longitudinal steel bar separately. 
     
     
         9 . The precast concrete column with the embedded recycled component according to  claim 1 , wherein a yield strength of a steel bar of the second connector is not less than a smaller value of a yield strength of the old longitudinal steel bar and a yield strength of the column longitudinal steel bar. 
     
     
         10 . A construction method for the precast concrete column with the embedded recycled component according to  claim 1 , comprising following steps:
 step (1), processing and fabricating column longitudinal steel bars, spiral stirrups, ordinary or composite stirrups, first connectors, and second connectors;   step (2), removing a stirrup protective layer of an old concrete component and performing surface roughening treatment to obtain a recycled component, and locally treating a part on the recycled component where the second connector is to be arranged, such that a welding surface of an old longitudinal steel bar at the part is exposed;   step (3), arranging column longitudinal steel bars and grouting sleeves, binding the spiral stirrups to the column longitudinal steel bars, and binding the ordinary or composite stirrups to the grouting sleeves to form a steel bar cage;   step (4), adjusting the steel bar cage fabricated in step (3) to a vertical state, and hoisting the recycled components from the top downwardly into an interior of the steel bar cage;   step (5), clasping the column longitudinal steel bar by the first connector from an outer side of the column longitudinal steel bar, welding the first connector to an adjacent old stirrup, and welding the second connector to an adjacent column longitudinal steel bar and old longitudinal steel bar;   step (6), completing formwork fabrication and horizontal formwork support for the precast concrete column with an embedded recycled component, hoisting the steel bar cage and recycled components constructed in step (4) and step (5) as a whole into a cavity enclosed by a formwork in a horizontal manner, and completing detailed positioning; and   step (7), casting fresh concrete into the cavity enclosed by the formwork, and performing vibration thoroughly and curing.   
     
     
         11 . A construction method for the precast concrete column with the embedded recycled component according to  claim 2 , comprising following steps:
 step (1), processing and fabricating column longitudinal steel bars, spiral stirrups, ordinary or composite stirrups, first connectors, and second connectors;   step (2), removing a stirrup protective layer of an old concrete component and performing surface roughening treatment to obtain a recycled component, and locally treating a part on the recycled component where the second connector is to be arranged, such that a welding surface of an old longitudinal steel bar at the part is exposed;   step (3), arranging column longitudinal steel bars and grouting sleeves, binding the spiral stirrups to the column longitudinal steel bars, and binding the ordinary or composite stirrups to the grouting sleeves to form a steel bar cage;   step (4), adjusting the steel bar cage fabricated in step (3) to a vertical state, and hoisting the recycled components from the top downwardly into an interior of the steel bar cage;   step (5), clasping the column longitudinal steel bar by the first connector from an outer side of the column longitudinal steel bar, welding the first connector to an adjacent old stirrup, and welding the second connector to an adjacent column longitudinal steel bar and old longitudinal steel bar;   step (6), completing formwork fabrication and horizontal formwork support for the precast concrete column with an embedded recycled component, hoisting the steel bar cage and recycled components constructed in step (4) and step (5) as a whole into a cavity enclosed by a formwork in a horizontal manner, and completing detailed positioning; and   step (7), casting fresh concrete into the cavity enclosed by the formwork, and performing vibration thoroughly and curing.   
     
     
         12 . A construction method for the precast concrete column with the embedded recycled component according to  claim 3 , comprising following steps:
 step (1), processing and fabricating column longitudinal steel bars, spiral stirrups, ordinary or composite stirrups, first connectors, and second connectors;   step (2), removing a stirrup protective layer of an old concrete component and performing surface roughening treatment to obtain a recycled component, and locally treating a part on the recycled component where the second connector is to be arranged, such that a welding surface of an old longitudinal steel bar at the part is exposed;   step (3), arranging column longitudinal steel bars and grouting sleeves, binding the spiral stirrups to the column longitudinal steel bars, and binding the ordinary or composite stirrups to the grouting sleeves to form a steel bar cage;   step (4), adjusting the steel bar cage fabricated in step (3) to a vertical state, and hoisting the recycled components from the top downwardly into an interior of the steel bar cage;   step (5), clasping the column longitudinal steel bar by the first connector from an outer side of the column longitudinal steel bar, welding the first connector to an adjacent old stirrup, and welding the second connector to an adjacent column longitudinal steel bar and old longitudinal steel bar;   step (6), completing formwork fabrication and horizontal formwork support for the precast concrete column with an embedded recycled component, hoisting the steel bar cage and recycled components constructed in step (4) and step (5) as a whole into a cavity enclosed by a formwork in a horizontal manner, and completing detailed positioning; and   step (7), casting fresh concrete into the cavity enclosed by the formwork, and performing vibration thoroughly and curing.   
     
     
         13 . A construction method for the precast concrete column with the embedded recycled component according to  claim 4 , comprising following steps:
 step (1), processing and fabricating column longitudinal steel bars, spiral stirrups, ordinary or composite stirrups, first connectors, and second connectors;   step (2), removing a stirrup protective layer of an old concrete component and performing surface roughening treatment to obtain a recycled component, and locally treating a part on the recycled component where the second connector is to be arranged, such that a welding surface of an old longitudinal steel bar at the part is exposed;   step (3), arranging column longitudinal steel bars and grouting sleeves, binding the spiral stirrups to the column longitudinal steel bars, and binding the ordinary or composite stirrups to the grouting sleeves to form a steel bar cage;   step (4), adjusting the steel bar cage fabricated in step (3) to a vertical state, and hoisting the recycled components from the top downwardly into an interior of the steel bar cage;   step (5), clasping the column longitudinal steel bar by the first connector from an outer side of the column longitudinal steel bar, welding the first connector to an adjacent old stirrup, and welding the second connector to an adjacent column longitudinal steel bar and old longitudinal steel bar;   step (6), completing formwork fabrication and horizontal formwork support for the precast concrete column with an embedded recycled component, hoisting the steel bar cage and recycled components constructed in step (4) and step (5) as a whole into a cavity enclosed by a formwork in a horizontal manner, and completing detailed positioning; and   step (7), casting fresh concrete into the cavity enclosed by the formwork, and performing vibration thoroughly and curing.   
     
     
         14 . A construction method for the precast concrete column with the embedded recycled component according to  claim 5 , comprising following steps:
 step (1), processing and fabricating column longitudinal steel bars, spiral stirrups, ordinary or composite stirrups, first connectors, and second connectors;   step (2), removing a stirrup protective layer of an old concrete component and performing surface roughening treatment to obtain a recycled component, and locally treating a part on the recycled component where the second connector is to be arranged, such that a welding surface of an old longitudinal steel bar at the part is exposed;   step (3), arranging column longitudinal steel bars and grouting sleeves, binding the spiral stirrups to the column longitudinal steel bars, and binding the ordinary or composite stirrups to the grouting sleeves to form a steel bar cage;   step (4), adjusting the steel bar cage fabricated in step (3) to a vertical state, and hoisting the recycled components from the top downwardly into an interior of the steel bar cage;   step (5), clasping the column longitudinal steel bar by the first connector from an outer side of the column longitudinal steel bar, welding the first connector to an adjacent old stirrup, and welding the second connector to an adjacent column longitudinal steel bar and old longitudinal steel bar;   step (6), completing formwork fabrication and horizontal formwork support for the precast concrete column with an embedded recycled component, hoisting the steel bar cage and recycled components constructed in step (4) and step (5) as a whole into a cavity enclosed by a formwork in a horizontal manner, and completing detailed positioning; and   step (7), casting fresh concrete into the cavity enclosed by the formwork, and performing vibration thoroughly and curing.   
     
     
         15 . A construction method for the precast concrete column with the embedded recycled component according to  claim 6 , comprising following steps:
 step (1), processing and fabricating column longitudinal steel bars, spiral stirrups, ordinary or composite stirrups, first connectors, and second connectors;   step (2), removing a stirrup protective layer of an old concrete component and performing surface roughening treatment to obtain a recycled component, and locally treating a part on the recycled component where the second connector is to be arranged, such that a welding surface of an old longitudinal steel bar at the part is exposed;   step (3), arranging column longitudinal steel bars and grouting sleeves, binding the spiral stirrups to the column longitudinal steel bars, and binding the ordinary or composite stirrups to the grouting sleeves to form a steel bar cage;   step (4), adjusting the steel bar cage fabricated in step (3) to a vertical state, and hoisting the recycled components from the top downwardly into an interior of the steel bar cage;   step (5), clasping the column longitudinal steel bar by the first connector from an outer side of the column longitudinal steel bar, welding the first connector to an adjacent old stirrup, and welding the second connector to an adjacent column longitudinal steel bar and old longitudinal steel bar;   step (6), completing formwork fabrication and horizontal formwork support for the precast concrete column with an embedded recycled component, hoisting the steel bar cage and recycled components constructed in step (4) and step (5) as a whole into a cavity enclosed by a formwork in a horizontal manner, and completing detailed positioning; and   step (7), casting fresh concrete into the cavity enclosed by the formwork, and performing vibration thoroughly and curing.   
     
     
         16 . A construction method for the precast concrete column with the embedded recycled component according to  claim 7 , comprising following steps:
 step (1), processing and fabricating column longitudinal steel bars, spiral stirrups, ordinary or composite stirrups, first connectors, and second connectors;   step (2), removing a stirrup protective layer of an old concrete component and performing surface roughening treatment to obtain a recycled component, and locally treating a part on the recycled component where the second connector is to be arranged, such that a welding surface of an old longitudinal steel bar at the part is exposed;   step (3), arranging column longitudinal steel bars and grouting sleeves, binding the spiral stirrups to the column longitudinal steel bars, and binding the ordinary or composite stirrups to the grouting sleeves to form a steel bar cage;   step (4), adjusting the steel bar cage fabricated in step (3) to a vertical state, and hoisting the recycled components from the top downwardly into an interior of the steel bar cage;   step (5), clasping the column longitudinal steel bar by the first connector from an outer side of the column longitudinal steel bar, welding the first connector to an adjacent old stirrup, and welding the second connector to an adjacent column longitudinal steel bar and old longitudinal steel bar;   step (6), completing formwork fabrication and horizontal formwork support for the precast concrete column with an embedded recycled component, hoisting the steel bar cage and recycled components constructed in step (4) and step (5) as a whole into a cavity enclosed by a formwork in a horizontal manner, and completing detailed positioning; and   step (7), casting fresh concrete into the cavity enclosed by the formwork, and performing vibration thoroughly and curing.   
     
     
         17 . A construction method for the precast concrete column with the embedded recycled component according to  claim 8 , comprising following steps:
 step (1), processing and fabricating column longitudinal steel bars, spiral stirrups, ordinary or composite stirrups, first connectors, and second connectors;   step (2), removing a stirrup protective layer of an old concrete component and performing surface roughening treatment to obtain a recycled component, and locally treating a part on the recycled component where the second connector is to be arranged, such that a welding surface of an old longitudinal steel bar at the part is exposed;   step (3), arranging column longitudinal steel bars and grouting sleeves, binding the spiral stirrups to the column longitudinal steel bars, and binding the ordinary or composite stirrups to the grouting sleeves to form a steel bar cage;   step (4), adjusting the steel bar cage fabricated in step (3) to a vertical state, and hoisting the recycled components from the top downwardly into an interior of the steel bar cage;   step (5), clasping the column longitudinal steel bar by the first connector from an outer side of the column longitudinal steel bar, welding the first connector to an adjacent old stirrup, and welding the second connector to an adjacent column longitudinal steel bar and old longitudinal steel bar;   step (6), completing formwork fabrication and horizontal formwork support for the precast concrete column with an embedded recycled component, hoisting the steel bar cage and recycled components constructed in step (4) and step (5) as a whole into a cavity enclosed by a formwork in a horizontal manner, and completing detailed positioning; and   step (7), casting fresh concrete into the cavity enclosed by the formwork, and performing vibration thoroughly and curing.   
     
     
         18 . A construction method for the precast concrete column with the embedded recycled component according to  claim 9 , comprising following steps:
 step (1), processing and fabricating column longitudinal steel bars, spiral stirrups, ordinary or composite stirrups, first connectors, and second connectors;   step (2), removing a stirrup protective layer of an old concrete component and performing surface roughening treatment to obtain a recycled component, and locally treating a part on the recycled component where the second connector is to be arranged, such that a welding surface of an old longitudinal steel bar at the part is exposed;   step (3), arranging column longitudinal steel bars and grouting sleeves, binding the spiral stirrups to the column longitudinal steel bars, and binding the ordinary or composite stirrups to the grouting sleeves to form a steel bar cage;   step (4), adjusting the steel bar cage fabricated in step (3) to a vertical state, and hoisting the recycled components from the top downwardly into an interior of the steel bar cage;   step (5), clasping the column longitudinal steel bar by the first connector from an outer side of the column longitudinal steel bar, welding the first connector to an adjacent old stirrup, and welding the second connector to an adjacent column longitudinal steel bar and old longitudinal steel bar;   step (6), completing formwork fabrication and horizontal formwork support for the precast concrete column with an embedded recycled component, hoisting the steel bar cage and recycled components constructed in step (4) and step (5) as a whole into a cavity enclosed by a formwork in a horizontal manner, and completing detailed positioning; and   step (7), casting fresh concrete into the cavity enclosed by the formwork, and performing vibration thoroughly and curing.