Steel reinforced concrete composite column and construction process thereof

Abstract

The invention relates to a steel reinforced concrete combination column and a construction technology thereof, and relates to the technical field of prefabricated assembly type buildings, the steel reinforced concrete combination column comprises a prefabricated part which is preprocessed in a factory and a construction part which is constructed and manufactured on site on a construction site, and the prefabricated part comprises prefabricated concrete, built-in profile steel and a bottom connecting plate; a plurality of built-in profile steels are arranged and can be mutually spliced in the height direction, and the precast concrete is poured on the outer sides of the built-in profile steels; the bottom connecting plate is arranged at the bottom of the lowermost built-in profile steel, the construction part comprises grouted concrete, first cast-in-place concrete and second cast-in-place concrete, the grouted concrete is arranged in a cavity in a filling mode, the first cast-in-place concrete is arranged at the joint of every two adjacent built-in profile steel in a pouring mode, and the second cast-in-place concrete is arranged at the joint of every two adjacent built-in profile steel in a pouring mode. And the second cast-in-place concrete is poured on the outer side of the bottom of the built-in profile steel located at the lowermost position. The structure column has the effects that the bearing capacity of the structure column is guaranteed and improved, and transportation and installation are convenient.

Description

Technical Field

[0001] The present application relates to the technical field of prefabricated and assembled buildings, and in particular to a steel-concrete composite column and a construction process thereof. Background Art

[0002] Prefabricated structural columns are important supporting structures for prefabricated buildings. They are manufactured in a factory environment and then transported to the construction site for rapid assembly, which has the advantage of convenient on-site construction.

[0003] At present, common prefabricated structural columns are mainly divided into two types: steel structural columns and prefabricated concrete columns. Although the overall structure of prefabricated steel structural columns is stable, they face the problem of difficult anti-corrosion and fire prevention technologies, resulting in high subsequent maintenance costs, and relatively high manufacturing and construction costs. Prefabricated concrete columns, although the manufacturing cost is low, have limited bearing capacity, and due to their heavy weight, they are inconvenient to transport and install, and difficult to assemble and connect with other prefabricated components, affecting construction efficiency and structural stability.

[0004] In view of the above problems, how to ensure and improve the bearing capacity of structural columns while facilitating transportation and installation has become a technical problem that needs to be urgently solved in the current field of prefabricated and assembled building technology. Summary of the invention

[0005] In order to ensure and improve the bearing capacity of structural columns and facilitate transportation and installation, the present application provides a steel-concrete composite column and a construction process thereof.

[0006] In the first aspect, the present application provides a steel-concrete composite column adopts the following technical solution: it includes a prefabricated part pre-processed in a factory and a construction part constructed on-site at a construction site, the prefabricated part includes prefabricated concrete, built-in steel, a pressure grouting pipe, a bottom connecting plate, and a splicing connector, the built-in steel is provided in a plurality and can be spliced ​​with each other in the height direction, a cavity is provided inside the built-in steel, and the prefabricated concrete is cast and arranged on the outside of the built-in steel; the bottom connecting plate is fixedly arranged at the bottom of the built-in steel located at the bottom, and is used for the installation and positioning of the composite column as a whole; the splicing connector is fixedly arranged on the remaining built-in steels, and is used for splicing two adjacent built-in steels; the pressure grouting pipe is fixedly arranged on the side wall of the built-in steel, and the pressure grouting pipe is interconnected with the inside of the built-in steel; the construction part includes core pouring concrete, a first cast-in-place concrete, and a second cast-in-place concrete, the core pouring concrete is filled and arranged in the cavity, the first cast-in-place concrete is cast and arranged at the connection between the two adjacent built-in steels, and the second cast-in-place concrete is cast and arranged on the outside of the bottom of the built-in steel located at the bottom.

[0007] By adopting the above technical scheme, the prefabricated parts are prefabricated in the factory, and the layered prefabrication of the outer contour of the structural column is completed, so that the outer contour of the structural column can be transported in layers, and the weight of the outer contour of the structural column during transportation and installation is reduced, so as to achieve the effect of facilitating transportation and installation; after the installation, fixation and mutual assembly of the prefabricated parts are completed on the construction site, the second cast-in-place concrete is poured to ensure the foundation stability of the structural column; the first cast-in-place concrete is poured to ensure the connection stability and connection strength between the outer contours of each structural column, and it is helpful to protect the steel components at the splicing part from corrosion and deformation; finally, the back-cast concrete is poured into the closed steel frame through the pressure grouting pipe until the inside of the closed steel frame is completely filled, thereby increasing the cross-sectional size of the concrete structural column and ensuring the bearing capacity of the structural column after forming. In this way, the bearing capacity and quality of the structural column after forming are guaranteed, and flexible construction operations can be carried out on the construction site to improve construction efficiency.

[0008] Optionally, the prefabricated part also includes reserved connecting parts, which are used to connect other prefabricated structures. The reserved connecting parts include a first horizontal plate, a second horizontal plate, and a first vertical plate. The first horizontal plate and the second horizontal plate are horizontally fixed on the outer wall of the built-in steel profile and are spaced apart from each other in the height direction. The first vertical plate is vertically fixed on the outer wall of the built-in steel profile. The first vertical plate is fixedly connected to the first horizontal plate and the second horizontal plate at the same time. The first vertical plate is penetrated by air holes and mounting holes. The air holes are located in the precast concrete and are used to exhaust internal air when the precast concrete is made. The mounting holes are located outside the precast concrete and are used for the installation of other precast components.

[0009] By adopting the above technical scheme, the first horizontal plate and the second horizontal plate provide a larger connection area, which enhances the connection stability of the first vertical plate. When pouring precast concrete, the air holes of the first vertical plate can effectively exhaust air, solve the bubble problem, and ensure the density and quality of the concrete. Precast concrete can increase the bearing capacity of the first vertical plate when installing other precast components. The setting of the installation holes provides an accurate connection position and a convenient installation method for installation with other precast components, which helps to improve the construction efficiency and structural integrity of prefabricated buildings.

[0010] Optionally, the prefabricated part also includes a plurality of reinforcing steel plates, which are horizontally fixed in the cavity, correspond one to one with the first horizontal plate and the second horizontal plate and are flush with each other in height, and are penetrated by slurry holes for passing the core concrete.

[0011] By adopting the above technical scheme, the reinforced steel plate can enhance the structural strength of the built-in steel section and prevent the built-in steel section from being deformed when subjected to force. The corresponding arrangement of the reinforced steel plate and the first horizontal plate and the second horizontal plate improves the bearing capacity of the structural column for other prefabricated components. After installing other prefabricated components, the hollow built-in steel section is not easy to deform, thereby improving the overall bearing capacity. The slurry holes ensure that the core concrete can flow freely in the cavity, thereby improving the overall performance of the structural column.

[0012] Optionally, the splicing connection includes a third horizontal plate, a fourth horizontal plate, a second vertical plate, and a fastening fixture, the fourth horizontal plate is horizontally fixed to the outer wall of the bottom of the built-in steel profile, the second vertical plate is vertically fixed to the outer wall of the built-in steel profile, the second vertical plate is fixedly connected to the fourth horizontal plate, the third horizontal plate is fixed to the bottom of the second vertical plate, the third horizontal plate is lower than the bottom of the built-in steel profile, a docking hole is penetrated on the third horizontal plate for inserting the top of the adjacent built-in steel profile, precast concrete is exposed on the upper surface of the first horizontal plate, and the third horizontal plate is connected to the first horizontal plate on the adjacent built-in steel profile by a fastening fixture.

[0013] By adopting the above technical solution, the docking holes on the third horizontal plate provide an insertion position for the top insertion of the adjacent built-in steel sections, making the splicing operation simpler and more precise. The fastening fixtures can connect the third horizontal plate with the first horizontal plate of the adjacent built-in steel sections, thereby improving the connection strength and reliability of the splicing, and realizing the steel connection of the entire combined column in the height direction, thereby ensuring the continuity and stability of the entire combined column in the height direction, and helping to improve the overall quality and safety of the building structure.

[0014] Optionally, the fastening fixture includes a screw, a nut, and a pad. The screw is fixed to a first horizontal plate on an adjacent built-in steel section. A connecting hole is formed through the third horizontal plate. The screw passes through the connecting hole and cooperates with the nut thread. The lower surface of the third horizontal plate abuts against the upper surface of the first horizontal plate on the adjacent built-in steel section, and the nut abuts against the upper surface of the third horizontal plate through the pad.

[0015] By adopting the above technical solution, the screw is fixed on the first horizontal plate, passes through the connecting hole of the third horizontal plate and cooperates with the nut thread to achieve a horizontal fastening connection. The provision of the pad increases the contact area between the nut and the third horizontal plate, disperses the pressure, further improves the stability of the connection, and effectively prevents the connection part from loosening or deforming when subjected to force, thereby ensuring the overall structural strength and safety of the combined column.

[0016] Optionally, a mounting end is fixedly provided on the first horizontal plate or the second horizontal plate, and the prefabricated part further comprises a steel mesh, wherein the steel mesh is arranged in the prefabricated concrete, the steel mesh comprises a plurality of main longitudinal steel bars and a plurality of main transverse steel bars, the main longitudinal steel bars are arranged along the height direction of the built-in steel section, the longitudinal steel bars are fixedly connected to the mounting end, and the transverse steel bars connect all the main longitudinal steel bars in the horizontal direction.

[0017] By adopting the above technical solution, the setting of the installation end enables the steel mesh to be connected to the first horizontal plate or the second horizontal plate, preventing the steel mesh from running when pouring concrete. The main longitudinal steel bars in the steel mesh are arranged along the height direction of the built-in steel section, thereby enhancing the tensile strength of the precast concrete in the height direction; the main transverse steel bars connect all the main longitudinal steel bars in the horizontal direction, thereby improving the integrity and shear resistance of the precast concrete, thereby making the structure of the precast concrete more stable and enhancing the bearing capacity and stability of the entire steel-concrete composite column.

[0018] Optionally, in the built-in steel section located at the bottom, the bottom of the main longitudinal steel bars extends out of the precast concrete to form reserved longitudinal steel bars, a horizontal end plate is fixedly provided at the bottom of the reserved longitudinal steel bars, a plurality of reserved transverse steel bars are provided on the reserved longitudinal steel bars, the reserved transverse steel bars connect all the reserved longitudinal steel bars in the horizontal direction, and the reserved transverse steel bars, reserved longitudinal steel bars and horizontal end plates are all cast in the second cast-in-place concrete.

[0019] By adopting the above technical solution, in the built-in steel section located at the bottom, the reserved transverse steel bars, the reserved longitudinal steel bars, and the horizontal end plates are all cast in the second cast-in-place concrete, thereby increasing the stability and bearing capacity of the second cast-in-place concrete, improving the integrity of the second cast-in-place concrete and the precast concrete, and improving the stability of the structural column.

[0020] Optionally, a detachable connector is provided at the end of the pressure grouting pipe, and the connector is used to connect to the core filling equipment. The connector includes a variable-section connecting pipe and a non-return baffle. The end of the variable-section connecting pipe is threadedly matched with the inner wall of the pressure grouting pipe. The inner diameter of one end of the variable-section connecting pipe close to the pressure grouting pipe is smaller than that of the end away from the pressure grouting pipe. A slot is provided in the middle of the variable-section connecting pipe, and the non-return baffle is inserted in the slot.

[0021] By adopting the above technical solution, the variable-section combined pipe and the threaded cooperation of the inner wall of the pressure grouting pipe ensure the stability and disassembly of the connection, which is convenient for maintenance and replacement. The variable-section design is conducive to improving the efficiency and stability of grouting. After the grouting work is completed, the check baffle can prevent the core concrete from leaking out of the pressure grouting pipe.

[0022] Optionally, a first flange ring is fixedly provided on the variable-section combining pipe near one end of the pressure grouting pipe, and a second flange ring is fixedly provided on one end of the pressure grouting pipe away from the closed built-in steel section. An elastic ring is provided on the outer side of the second flange ring, and the first flange ring and the second flange ring are counteracted by the elastic ring.

[0023] By adopting the above technical solution, the provision of the first flange ring, the second flange ring and the elastic ring enhances the sealing and stability of the connection between the connector and the pressure grouting pipe. During the grouting process, the elastic ring can play a buffering and sealing role to prevent concrete leakage, thereby improving the quality and safety of construction.

[0024] In the second aspect, the present application provides a construction process for a steel-concrete composite column using the following technical solution: S1. Fix the reinforcing steel plate in the internal cavity of the built-in steel, fix the reserved connector on the side wall of the built-in steel, fix the bottom connecting plate to the bottom of one of the built-in steels, fix the splicing connector to the bottom of the remaining built-in steels, open holes in the side wall of the built-in steel and fix the pressure grouting pipe accordingly; S2. Prepare a steel mesh consisting of main longitudinal steel bars and main transverse steel bars outside the built-in steel section and fix the main longitudinal steel bars on the installation end; S3. Place the built-in steel and steel mesh into the mold, place the portion below the third horizontal plate in the reserved connector, the reserved longitudinal steel bars in the steel mesh, the reserved transverse steel bars, and the horizontal end plate outside the concrete pouring cavity of the mold, and adjust the position; S4, pouring precast concrete between the mold and the built-in steel, the highest point of the precast concrete is flush with the top of the first horizontal plate, waiting for the precast concrete to solidify, and completing the processing of the precast part; S5. Transport the prefabricated parts to the construction site, fix the bottom connecting plate at the corresponding position of the construction site, and splice the internal steel sections until a stable frame is formed; S6, performing on-site construction on the first cast-in-place concrete until the first cast-in-place concrete solidifies, thereby completing the foundation fixation of the mechanism column; S7. For the installation and construction of other prefabricated components such as the secondary beams and floor slabs of the main structure, the second cast-in-place concrete is constructed simultaneously with the floor slab concrete, or the second cast-in-place concrete is constructed after the floor concrete construction is completed; S8, pouring core concrete into the built-in steel section through the pressure grouting pipe until the core concrete completely fills the inside of the built-in steel section; S9. Use a check plate to temporarily block the pressure grouting pipe and wait for the core concrete to solidify; S10. After the core concrete solidifies, a cover is placed on the outer end of the pressure grouting pipe, and cement mortar is brushed on the outside of the cover to ensure the overall beauty of the structural column and complete the construction of the structural column.

[0025] In summary, the present application includes at least one of the following beneficial technical effects: 1. By setting up multiple built-in steel sections and splicing connectors that can be spliced ​​with each other in the height direction, the existing prefabricated structural columns can effectively solve the problem of not being able to meet the requirements of bearing capacity and transportation and installation convenience at the same time, while ensuring the structural strength, the construction efficiency and quality are improved; 2. By setting the first horizontal plate, the second horizontal plate, the first vertical plate and the reinforcing steel plate, the bearing capacity and stability of the assembly connection of the structural column with other prefabricated components are enhanced, which facilitates the steel structure connection between the structural column and other prefabricated components and can meet higher building structure requirements; 3. By setting reserved longitudinal steel bars, reserved transverse steel bars and horizontal end plates, the integrity of the second cast-in-place concrete and the precast concrete and the foundation stability of the structural columns are improved, thereby enhancing the reliability and safety of the entire building structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of a steel-concrete composite column structure provided in an embodiment of the present application; Figure 2 is a schematic diagram of the structure of the prefabricated part provided in the embodiment of the present application; Figure 3 It is a schematic cross-sectional view of a steel-concrete composite column provided in an embodiment of the present application; Figure 4 is a schematic diagram of the structure of the reserved connection member provided in the embodiment of the present application; Figure 5 is a schematic diagram of the structure of the splicing connector provided in an embodiment of the present application; Figure 6 It is a structural schematic diagram of the connection of adjacent built-in steel sections in an embodiment of the present application; Figure 7 It is a schematic diagram of the installation of the adapter in the embodiment of the present application.

[0027] In the figure, 1, built-in steel; 11, precast concrete; 12, cavity; 13, pressure grouting pipe; 131, second flange ring; 132, elastic ring; 14, bottom connecting plate; 15, splicing connector; 151, third horizontal plate; 1511, docking hole; 1512, connecting hole; 152, fourth horizontal plate; 153, second vertical plate; 154, fastening fixture; 1541, screw; 1542, nut; 1543, pad; 16, reserved connector; 161, first horizontal plate; 162, second horizontal plate; 163. First vertical plate; 1631. Air vent; 1632. Mounting hole; 17. Reinforced steel plate; 171. Slurry hole; 18. Steel mesh; 181. Main longitudinal steel bar; 1811. Reserved longitudinal steel bar; 1812. Horizontal end plate; 1813. Mounting end; 182. Main transverse steel bar; 1822. Reserved transverse steel bar; 2. Core pouring concrete; 3. First cast-in-place concrete; 4. Second cast-in-place concrete; 5. Connector; 51. Variable cross-section connecting pipe; 52. Slot; 53. Check partition; 54. First flange ring. DETAILED DESCRIPTION

[0028] The following is combined with Figure 1 -Attached Figure 7 , further details of this application are given.

[0029] Example 1: A steel-concrete composite column, referring to Figures 1 to 7 , including the prefabricated part pre-processed in the factory and the construction part constructed on site. The prefabricated part includes prefabricated concrete 11, built-in steel 1, pressure grouting pipe 13, bottom connection plate 14, splicing connector 15, steel mesh 18, reserved connector 16, and reinforcing steel plate 17. The construction part includes core pouring concrete 2, first cast-in-place concrete 3, and second cast-in-place concrete 4.

[0030] Reference Figure 1 and Figure 2 , several built-in steel sections 1 are arranged and can be spliced ​​with each other in the height direction, a cavity 12 is arranged inside the built-in steel section 1, and precast concrete 11 is cast and arranged outside the built-in steel section 1. Precast concrete 11 preferably uses lightweight concrete. The bottom connecting plate 14 is fixedly arranged at the bottom of the built-in steel section 1 located at the bottom, and is used for the installation and positioning of the combined column as a whole. The splicing connector 15 is fixedly arranged on the remaining built-in steel sections 1, and is used for splicing two adjacent built-in steel sections 1. The reserved connector 16 is used to connect other prefabricated structures. The pressure grouting pipe 13 is fixedly arranged on the side wall of the built-in steel section 1, and the pressure grouting pipe 13 is interconnected with the inside of the built-in steel section 1, and is used for pouring the core concrete 2.

[0031] Reference Figure 1The core-cast concrete 2 is filled in the cavity 12. The core-cast concrete 2 preferably uses high-strength concrete to increase the cross-sectional size of the concrete structural column and ensure the bearing capacity of the structural column after forming. The first cast-in-place concrete 3 is poured and set at the connection between two adjacent built-in steel sections 1 to ensure the connection stability and connection strength between the outer contours of each structural column, and to help protect the steel components at the splicing site from corrosion and deformation. The second cast-in-place concrete 4 is poured and set on the outside of the bottom of the built-in steel section 1 located at the bottom to ensure the foundation stability of the structural column.

[0032] In order to facilitate the connection with other prefabricated structures, refer to Figure 1 and Figure 4 The reserved connection member 16 includes a first horizontal plate 161, a second horizontal plate 162, and a first vertical plate 163. The first horizontal plate 161 and the second horizontal plate 162 are horizontally fixed on the outer wall of the built-in steel section 1, and are spaced apart from each other in the height direction. The upper surface of the first horizontal plate 161 is exposed from the precast concrete 11. The first vertical plate 163 is vertically fixed on the outer wall of the built-in steel section 1, and the first vertical plate 163 is fixedly connected to the first horizontal plate 161 and the second horizontal plate 162 at the same time. The first vertical plate 163 is provided with an air vent 1631 and an installation hole 1632. The air vent 1631 is located in the precast concrete 11 and is used to exhaust the internal air when the precast concrete 11 is made. The installation hole 1632 is located outside the precast concrete 11 and is used for the installation of other precast components (such as the secondary beam of the main structure, the floor slab, etc.). A plurality of reinforcing steel plates 17 are fixedly arranged horizontally in the cavity 12. The reinforcing steel plates 17 correspond to the first horizontal plate 161 and the second horizontal plate 162 one by one and are flush with each other in height. The reinforcing steel plates 17 are provided with grouting holes 171 for the core concrete 2 to pass through. The reinforcing steel plates 17 are used to ensure the bearing capacity of the built-in steel section 1 to other prefabricated components connected to the reserved connecting piece 16 when the core concrete 2 is not poured or the core concrete 2 is not solidified.

[0033] In order to facilitate the splicing of two adjacent internal steel sections 1, refer to Figure 5 The splicing connector 15 includes a third horizontal plate 151, a fourth horizontal plate 152, a second vertical plate 153, and a fastening fixture 154. The fourth horizontal plate 152 is horizontally fixed to the outer wall of the bottom of the built-in steel 1, the second vertical plate 153 is vertically fixed to the outer wall of the built-in steel 1, and the second vertical plate 153 is fixedly connected to the fourth horizontal plate 152. The third horizontal plate 151 is fixed to the bottom of the second vertical plate 153, the third horizontal plate 151 is lower than the bottom of the built-in steel 1, and a butt hole 1511 is provided through the third horizontal plate 151 for inserting the top of the adjacent built-in steel 1.

[0034] Reference Figure 6The third horizontal plate 151 is connected to the first horizontal plate 161 on the adjacent built-in steel 1 through a fastening fixture 154. The fastening fixture 154 includes a screw 1541, a nut 1542, and a pad 1543. The screw 1541 is fixed to the first horizontal plate 161 on the adjacent built-in steel 1. A connecting hole 1512 is provided on the third horizontal plate 151. The screw 1541 passes through the connecting hole 1512 and is threadedly engaged with the nut 1542. The lower surface of the third horizontal plate 151 abuts against the upper surface of the first horizontal plate 161 on the adjacent built-in steel 1. The nut 1542 abuts against the upper surface of the third horizontal plate 151 through the pad 1543.

[0035] In order to improve the overall strength and stability of the structural column, refer to Figure 6 , a mounting end 1813 is fixedly arranged on the first horizontal plate 161 or the second horizontal plate 162. The steel mesh 18 is arranged in the precast concrete 11 to enhance the bearing capacity and stability of the composite column. The steel mesh 18 includes a plurality of main longitudinal steel bars 181 and a plurality of main transverse steel bars 182. The main longitudinal steel bars 181 are arranged along the height direction of the built-in steel section 1. The longitudinal steel bars are fixedly connected to the mounting end 1813, and the transverse steel bars connect all the main longitudinal steel bars 181 in the horizontal direction.

[0036] Reference Figure 1 , and in the built-in steel section 1 located at the bottom, the bottom of the main longitudinal reinforcement 181 extends out of the precast concrete 11 to form a reserved longitudinal reinforcement 1811. A horizontal end plate 1812 is fixedly arranged at the bottom of the reserved longitudinal reinforcement 1811, and a plurality of reserved transverse reinforcements 1822 are arranged on the reserved longitudinal reinforcement 1811, and the reserved transverse reinforcement 1822 connects all the reserved longitudinal reinforcements 1811 in the horizontal direction. The reserved transverse reinforcement 1822, the reserved longitudinal reinforcement 1811, and the horizontal end plate 1812 are all cast in the second cast-in-place concrete 4. The stability and bearing capacity of the second cast-in-place concrete 4 are increased, and the integrity of the second cast-in-place concrete 4 and the precast concrete 11 is improved, thereby improving the overall stability of the structural column.

[0037] In order to facilitate the pouring and sealing of concrete, a detachable adapter 5 is provided at the end of the pressure grouting pipe 13, and the adapter is used to connect with the core filling equipment. The adapter 5 includes a variable cross-section coupling pipe 51 and a non-return baffle 53. The end of the variable cross-section coupling pipe 51 is threadedly matched with the inner wall of the pressure grouting pipe 13. The inner diameter of the end of the variable cross-section coupling pipe 51 close to the pressure grouting pipe 13 is smaller than that of the end away from the pressure grouting pipe 13. A clamping groove 52 is provided in the middle of the variable cross-section coupling pipe 51, and the non-return baffle 53 is inserted in the clamping groove 52. A first flange ring 54 is fixedly provided on the end of the variable cross-section coupling pipe 51 close to the pressure grouting pipe 13, and a second flange ring 131 is fixedly provided on the end of the pressure grouting pipe 13 away from the closed built-in steel 1. An elastic ring 132 is provided on the outer side of the second flange ring 131, and the first flange ring 54 and the second flange ring 131 are abutted against each other through the elastic ring 132. After the grouting work is completed, the check plate 53 can prevent the core concrete 2 from leaking out of the pressure grouting pipe 13.

[0038] Based on the above embodiments, it is further explained that during the production, transportation and hoisting process, the material consumption and unit component weight have a great influence on the production, transportation and hoisting process costs. Figures 1 to 7 For example, the cross-sectional dimensions of a steel-concrete composite column are 700*700mm, with 150mm thick precast concrete 11 reserved on each side, the size of the internal steel 1 is 400*400mm, and the on-site core-cast concrete 2 is used for construction. If the unit mass density of concrete is 2.5 tons per cubic meter, the weight of the precast concrete part of the steel-concrete composite column in the factory is (0.700-0.150)*4*0.150*2.5=0.825 tons per meter, the weight of the core-cast concrete 2 is 0.40*0.40*2.5=0.25 tons per meter, and the total weight after construction is 1.225 tons per meter; the factory transportation and hoisting weight of the steel-concrete composite column is 67.35% of the weight after construction, saving 32.65% of the transportation and hoisting weight. Similarly, the cross-sectional dimensions of the steel-concrete composite column are 500*500mm, and the dimensions of the built-in steel 1 are 200*200mm, which can save 16% of the transportation and hoisting weight; the cross-sectional dimensions of the steel-concrete composite column are 600*600mm, and the dimensions of the built-in steel 1 are 300*300mm, which can save 25% of the transportation and hoisting weight; the cross-sectional dimensions of the steel-concrete composite column are 800*800mm, and the dimensions of the built-in steel 1 are 500*500mm, which can save 39% of the transportation and hoisting weight; the cross-sectional dimensions of the steel-concrete composite column are 900*900mm, and the dimensions of the built-in steel 1 are 600*500mm, which can save 44.44% of the transportation and hoisting weight. It can be seen that with the increase of the cross-sectional dimensions of the steel-concrete composite column, the weight reduction effect is more obvious, and the effect is more significant when lightweight concrete is used to precast concrete 11.

[0039] Based on the above embodiments, it is further explained that in the process of technical design and production, the uniformity of the cross-section of prefabricated components is particularly important, which especially affects the supply cycle of prefabricated components and the efficiency of the use of prefabricated molds for production auxiliary materials, greatly affecting the cost of prefabricated components and the promotion and application of prefabricated assembly structure technology. Figures 1 to 7 The cross-sectional dimensions of a steel-concrete composite column are 700*700mm, and the dimensions of the built-in steel 1 are 400*400*8mm. According to the design principle of steel-concrete composite columns: the compressive bearing capacity of steel-concrete composite columns is equal to the sum of the compressive bearing capacity of concrete and the compressive bearing capacity of built-in steel-concrete.

[0040] The compressive bearing capacity of precast concrete 11 is A1, the compressive bearing capacity of built-in steel 1 is A2, and the compressive bearing capacity of core concrete 2 is A3. For example: the material of precast concrete 11 is C40 concrete, and the design strength per unit area is 19.1 Newtons per square millimeter; the compressive bearing capacity A1=(700-150)*4*150*19.1=6303 kN, the material of built-in steel 1 is Q355 steel, and the design strength per unit area is 355 Newtons per square millimeter, the size is 400*400*8mm, the compressive bearing capacity A2=400*8*4*355=4544 kN, the material of core concrete 2 is The material is C40 concrete, the size is 400*400mm, and the design strength per unit area is 19.1N per square millimeter; the compressive bearing capacity A3=400*400*19.1=3056kN, the compressive bearing capacity of the steel-concrete composite column is equal to 13903kN, and the core concrete 2 accounts for 21.98% of the total compressive bearing capacity; when the precast concrete 11 and the built-in steel 1 material are fixed, the material strength of the core concrete 2 is adjusted to C40~C80. The compressive bearing capacity of the steel-concrete composite column can be increased to 16591kN at most, which is 20% higher than when the core concrete 2 material is C40 concrete, that is, the steel-concrete composite column with a cross-sectional size within 13903kN to 16591kN can be used to produce technical data and concrete precast molds, steel mesh, etc. for steel structures. When using higher strength core concrete, the effect is better; if multiple projects are coordinated and controlled, production technology data and molds can be used in a turnover manner, the investment in production technology data and molds in the production process can be greatly reduced. This can reduce production costs and increase production speed, reduce waste of consumables such as molds and carbon emissions in the production process, improve overall efficiency, and achieve green and environmentally friendly construction.

[0041] The implementation principle of the embodiment of the present application is: the prefabricated parts are prefabricated in the factory, and the layered prefabrication of the outer contour of the structural column is completed, so that the outer contour of the structural column can be transported in layers, and the weight of the outer contour of the structural column during transportation and installation is reduced to achieve the effect of facilitating transportation and installation. After the installation and fixation of the prefabricated parts and the mutual assembly are completed on the construction site, the second cast-in-place concrete 4 is poured to ensure the foundation stability of the structural column; the second cast-in-place concrete 4 is poured again to ensure the connection stability and connection strength between the outer contours of each structural column, and it helps to protect the steel components at the splicing part from corrosion and deformation. Finally, the pressure grouting pipe 13 is used to pour the back pouring concrete into the closed steel frame until the inside of the closed steel frame is completely filled, thereby increasing the cross-sectional size of the concrete structural column and ensuring the bearing capacity of the structural column after forming. In this way, the bearing capacity and quality of the structural column after forming are guaranteed, and flexible construction operations can be carried out on the construction site, the construction efficiency is improved, and it is conducive to the saving of construction materials and the standardization of production, and the green and intelligent process of house construction is improved.

[0042] Embodiment 2: A construction process of a steel-concrete composite column, S1, fixing a reinforcing steel plate 17 in an internal cavity 12 of an internal steel section 1, fixing a reserved connection piece 16 on a side wall of the internal steel section 1, fixing a bottom connection plate 14 on the bottom of one of the internal steel sections 1, fixing a splicing connection piece 15 on the bottom of the remaining internal steel sections 1, opening a hole in the side wall of the internal steel section 1 and fixing a pressure grouting pipe 13 accordingly; S2, prepare a steel mesh 18 composed of main longitudinal steel bars 181 and main transverse steel bars 182 outside the built-in steel section 1 and fix the main longitudinal steel bars 181 on the installation end 1813; S3, put the built-in steel 1 and the steel mesh 18 into the mold, place the part below the third horizontal plate 151 in the reserved connector 16, the reserved longitudinal steel bars 1811 in the steel mesh 18, the reserved transverse steel bars 1822, and the horizontal end plate 1812 outside the concrete pouring cavity of the mold, and adjust the position; S4, pouring precast concrete 11 between the mold and the built-in steel 1, the highest point of the precast concrete 11 is flush with the top of the first horizontal plate 161, waiting for the precast concrete 11 to solidify, and completing the processing of the precast part; S5, transporting the prefabricated parts to the construction site, fixing the bottom connecting plate 14 at the corresponding position of the construction site, and splicing the internal steel sections 1 until a stable frame is formed; S6, performing on-site construction on the first cast-in-place concrete 3 until the first cast-in-place concrete 3 solidifies, completing the foundation fixation of the mechanism column; S7, installing and constructing other prefabricated components such as the secondary beams and floor slabs of the main structure, and constructing the second cast-in-place concrete 4 at the same time as the floor slab concrete, or completing the second cast-in-place concrete 4 after the floor concrete construction is completed; S8, pouring the core-filling concrete 2 into the built-in steel section 1 through the pressure grouting pipe 13 until the core-filling concrete 2 completely fills the interior of the built-in steel section 1; S9, temporarily block the pressure grouting pipe 13 with the check plate 53, and wait for the core concrete 2 to solidify; S10, after the core concrete 2 solidifies, a cover is placed on the outer end of the pressure grouting pipe 13, and cement mortar is painted on the outside of the cover to ensure the overall beauty of the structural column and complete the construction of the structural column.

[0043] The embodiments of this specific implementation are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. The same components are represented by the same figure marks. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A steel-concrete composite column, It is characterized in that The invention comprises a prefabricated part which is pre-processed in a factory and a construction part which is constructed and manufactured on site at a construction site, wherein the prefabricated part comprises prefabricated concrete (11), an internal steel section (1), a pressure grouting pipe (13), a bottom connecting plate (14), and a splicing connector (15), wherein the internal steel section (1) is provided in a plurality of pieces and can be spliced ​​with each other in a height direction, a cavity (12) is provided inside the internal steel section (1), and the prefabricated concrete (11) is cast and arranged outside the internal steel section (1); the bottom connecting plate (14) is fixedly arranged at the bottom of the internal steel section (1) located at the bottom, and is used for installation and positioning of the combined column as a whole; the splicing connector The parts (15) are fixedly arranged on the remaining built-in steel sections (1) and are used for splicing two adjacent built-in steel sections (1); the pressure grouting pipe (13) is fixedly arranged on the side wall of the built-in steel section (1), and the pressure grouting pipe (13) is interconnected with the inside of the built-in steel section (1); the construction part comprises core pouring concrete (2), first cast-in-place concrete (3), and second cast-in-place concrete (4); the core pouring concrete (2) is filled and arranged in the cavity (12), the first cast-in-place concrete (3) is cast and arranged at the connection between two adjacent built-in steel sections (1), and the second cast-in-place concrete (4) is cast and arranged on the outside of the bottom of the built-in steel section (1) located at the bottom.

2. A steel-concrete composite column according to claim 1, It is characterized in that The prefabricated part also includes a reserved connection piece (16), and the reserved connection piece (16) is used to connect other prefabricated structures. The reserved connection piece (16) includes a first horizontal plate (161), a second horizontal plate (162), and a first vertical plate (163). The first horizontal plate (161) and the second horizontal plate (162) are horizontally fixed on the outer wall of the built-in steel section (1) and are spaced apart from each other in the height direction. The first vertical plate (163) is vertically fixed on the outer wall of the built-in steel section (1). The first vertical plate (163) is fixedly connected to the first horizontal plate (161) and the second horizontal plate (162). The first vertical plate (163) is provided with an air vent (1631) and a mounting hole (1632). The air vent (1631) is located inside the precast concrete (11) and is used to exhaust internal air when the precast concrete (11) is manufactured. The mounting hole (1632) is located outside the precast concrete (11) and is used for installing other precast components.

3. A steel-concrete composite column according to claim 2, It is characterized in that The prefabricated part also includes a reinforcing steel plate (17). A plurality of the reinforcing steel plates (17) are horizontally fixedly arranged in the cavity (12). The reinforcing steel plates (17) correspond to the first horizontal plate (161) and the second horizontal plate (162) one by one and are flush with each other in height. The reinforcing steel plates (17) are provided with slurry holes (171) for the core concrete (2) to pass through.

4. A steel-concrete composite column according to claim 2, It is characterized in that The splicing connector (15) comprises a third horizontal plate (151), a fourth horizontal plate (152), a second vertical plate (153), and a fastening fixture (154); the fourth horizontal plate (152) is horizontally fixed to the outer wall of the bottom of the built-in steel section (1); the second vertical plate (153) is vertically fixed to the outer wall of the built-in steel section (1); the second vertical plate (153) is fixedly connected to the fourth horizontal plate (152); the third horizontal plate (151) is fixed to the bottom of the second vertical plate (153); the third horizontal plate (151) is lower than the bottom of the built-in steel section (1); a docking hole (1511) is provided through the third horizontal plate (151) for inserting the top of the adjacent built-in steel section (1); the upper surface of the first horizontal plate (161) is exposed to the precast concrete (11); the third horizontal plate (151) is connected to the first horizontal plate (161) on the adjacent built-in steel section (1) through the fastening fixture (154).

5. A steel-concrete composite column according to claim 4, It is characterized in that The fastening fixture (154) comprises a screw (1541), a nut (1542), and a pad (1543); the screw (1541) is fixed on a first horizontal plate (161) on an adjacent built-in steel section (1); a connecting hole (1512) is provided through the third horizontal plate (151); the screw (1541) passes through the connecting hole (1512) and is threadedly engaged with the nut (1542); the lower surface of the third horizontal plate (151) abuts against the upper surface of the first horizontal plate (161) on the adjacent built-in steel section (1); and the nut (1542) abuts against the upper surface of the third horizontal plate (151) through the pad (1543).

6. The steel-concrete composite column according to claim 2, It is characterized in that A mounting end (1813) is fixedly arranged on the first horizontal plate (161) or the second horizontal plate (162), and the prefabricated part also includes a steel mesh (18), the steel mesh (18) is arranged in the prefabricated concrete (11), the steel mesh (18) includes a plurality of main longitudinal steel bars (181) and a plurality of main transverse steel bars (182), the main longitudinal steel bars (181) are arranged along the height direction of the built-in steel section (1), the longitudinal steel bars are fixedly connected to the mounting end (1813), and the transverse steel bars connect all the main longitudinal steel bars (181) in the horizontal direction.

7. The steel-concrete composite column according to claim 6, It is characterized in that In the bottommost built-in steel section (1), the bottom of the main longitudinal reinforcement (181) extends out of the precast concrete (11) to form a reserved longitudinal reinforcement (1811), a horizontal end plate (1812) is fixedly arranged at the bottom of the reserved longitudinal reinforcement (1811), a plurality of reserved transverse reinforcements (1822) are arranged on the reserved longitudinal reinforcement (1811), the reserved transverse reinforcement (1822) connects all the reserved longitudinal reinforcements (1811) in the horizontal direction, and the reserved transverse reinforcement (1822), the reserved longitudinal reinforcement (1811) and the horizontal end plate (1812) are all cast in the second cast-in-place concrete (4).

8. The steel-concrete composite column according to claim 1, It is characterized in that The end of the pressure grouting pipe (13) is provided with a detachable connector (5), and the connector is used to connect with the core filling equipment. The connector (5) comprises a variable cross-section connecting pipe (51) and a non-return baffle (53). The end of the variable cross-section connecting pipe (51) is threadedly matched with the inner wall of the pressure grouting pipe (13). The inner diameter of the end of the variable cross-section connecting pipe (51) close to the pressure grouting pipe (13) is smaller than that of the end away from the pressure grouting pipe (13). A slot (52) is provided in the middle of the variable cross-section connecting pipe (51), and the non-return baffle (53) is inserted into the slot (52).

9. The steel-concrete composite column according to claim 8, It is characterized in that A first flange ring (54) is fixedly provided on one end of the variable cross-section connecting pipe (51) close to the pressure grouting pipe (13), and a second flange ring (131) is fixedly provided on one end of the pressure grouting pipe (13) away from the closed internal steel section (1). An elastic ring (132) is provided on the outer side of the second flange ring (131), and the first flange ring (54) and the second flange ring (131) are abutted against each other via the elastic ring (132).

10. A construction process for steel-concrete composite columns. It is characterized in that S1, fix the reinforcing steel plate (17) in the internal cavity (12) of the built-in steel section (1), fix the reserved connecting piece (16) on the side wall of the built-in steel section (1), fix the bottom connecting plate (14) to the bottom of one of the built-in steel sections (1), fix the splicing connecting piece (15) to the bottom of the remaining built-in steel sections (1), open a hole in the side wall of the built-in steel section (1) and fix the pressure grouting pipe (13) accordingly; S2. preparing a steel mesh (18) composed of main longitudinal steel bars (181) and main transverse steel bars (182) outside the built-in steel section (1), and fixing the main longitudinal steel bars (181) on the installation end (1813); S3, placing the built-in steel (1) and the steel mesh (18) into the mold, placing the portion below the third horizontal plate (151) in the reserved connection piece (16), the reserved longitudinal steel bars (1811) in the steel mesh (18), the reserved transverse steel bars (1822), and the horizontal end plate (1812) outside the concrete pouring cavity of the mold, and adjusting the positions; S4, pouring precast concrete (11) between the mold and the built-in steel (1), so that the highest point of the precast concrete (11) is flush with the top of the first horizontal plate (161), waiting for the precast concrete (11) to solidify, and completing the processing of the precast part; S5, transporting the prefabricated parts to the construction site, fixing the bottom connecting plate (14) at the corresponding position of the construction site, and splicing the internal steel sections (1) until a stable frame is formed; S6, performing on-site construction on the first cast-in-place concrete (3) until the first cast-in-place concrete (3) solidifies, thereby completing the foundation fixation of the mechanism column; S7, installing and constructing other prefabricated components such as the secondary beams and floor slabs of the main structure, and constructing the second cast-in-place concrete (4) at the same time as the floor slab concrete, or completing the second cast-in-place concrete (4) after the floor concrete construction is completed; S8, pouring the core-casting concrete (2) into the built-in steel section (1) through the pressure grouting pipe (13), until the core-casting concrete (2) completely fills the interior of the built-in steel section (1); S9, temporarily blocking the pressure grouting pipe (13) with a check plate (53), and waiting for the core concrete (2) to solidify; S10, after the core concrete (2) solidifies, a cover is placed on the outer end of the pressure grouting pipe (13), and cement mortar is painted on the outside of the cover to ensure the overall beauty of the structural column, thereby completing the construction of the structural column.

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