A construction method for building structural columns

Abstract

The present invention discloses a construction method for building structural columns. Two inner keels are clamped on a connecting steel plate through positioning steel bars. The opening side of an outer keel is aligned with the inner wing plate sides of the two inner keels, and then the outer keel is pushed forcefully towards the inner keels. The two flanges one are respectively inserted into the U-shaped grooves on the outer sides of the two second stiffeners, and at the same time, the first stiffener is inserted between the two flanges two. Similarly, another outer keel is fixedly installed on the other side of the two inner keels. The two flanges one of this outer keel are respectively inserted into the U-shaped grooves of the two second stiffeners of the inner keels, and the flanges one of the two outer keels are tightened in the U-shaped grooves. The lower edges of the two outer keels are welded to the upper surface of the connecting steel plate. Finally, concrete is filled in the cavity formed by the two outer keels and the two inner keels. This application can connect the inner and outer cold-formed thin-walled steel plates without damaging the cold-formed thin-walled steel plate of the structural column, with simple operation, time-saving and labor-saving.

Description

Technical Field

[0001] The present invention relates to the field of building construction, and more specifically, to a construction method for building structural columns. Background Art

[0002] The house structure generally refers to two parts, namely its building's load-bearing structure and enclosure structure. Before the construction of a house, its structural type is determined according to the number of floors, cost, construction, etc. of the building. The durability, seismic resistance, safety, and space utilization performance of houses with various structures are different. Common house structures include brick-concrete structure, reinforced concrete structure, frame structure, frame-shear wall structure, steel structure, and core tube structure, etc. Among them, the steel structure includes light steel structure and heavy steel structure, and the cold-formed thin-walled steel structure belongs to the light steel structure.

[0003] The cold-formed thin-walled steel structure is made of various cold-formed steel sections. In building construction, cold-formed steel sections can be used as main load-bearing members such as steel frames, trusses, beams, and columns, and can also be used as secondary members and enclosure structures such as roof purlins, wall frame beams and columns, keels, doors and windows, roof panels, wall panels, and floor slabs. In addition, the cold-formed steel-concrete composite structure formed by using cold-formed steel sections and reinforced concrete to form composite beams, slabs, and columns has also become a new research direction in the engineering field.

[0004] In the prior art, the above-mentioned cold-formed steel-concrete composite structure has been adopted. For example, the structural column, building, and manufacturing method of the structural column proposed in Chinese Patent with the application number 202210808597.7 form an accommodation cavity by docking two first keels and enclosing them together. At the same time, two second keels are arranged opposite to each other and enclose the outside of the two first keels together. The first keel and the second keel are connected by a plurality of first connectors and second connectors, so that the connection between the first keel and the second keel is stable, and thus the structural column forms a multi-layer structure. Compared with the traditional single-piece thin-walled steel keel, it can greatly enhance the strength, stiffness, and flexural resistance of the structural column, and has better ability to resist horizontal loads and vertical loads. And by filling fillers in the accommodation cavity formed by enclosing the two first keels together, the compressive and shear resistance of the structural column can be further increased. The first connectors and the second connectors use self-tapping screws or self-drilling self-tapping screws, which require drilling holes on the surfaces of the first keel and the second keel and then driving the screws in or directly driving the screws in, which will reduce the strength of the cold-formed thin-walled steel plate of the structural column, affect the bearing capacity of the structural column, and the construction is time-consuming and laborious. Summary of the Invention

[0005] 1. Technical Problems to be Solved

[0006] The present invention provides a construction method for building structural columns, which can connect the inner and outer layers of cold-formed thin-walled steel plates without damaging the cold-formed thin-walled steel plates of the structural columns, with simple operation, time-saving and labor-saving.

[0007] 2. Technical Solution

[0008] To achieve the above object, the present invention provides a construction method for building structural columns. The specific construction method steps are as follows:

[0009] S1: Before the floor concrete is poured, weld the positioning connection structure to the floor steel bar framework.

[0010] S2: Prefabricate multiple outer keels. Bend the two sides of the cold-formed thin-walled steel plate by 90 degrees. The bent parts on both sides form two symmetric outer wing plates. The part connecting the two outer wing plates is the outer web. Bend the free sides of the two outer wing plates inward by 90 degrees to form two opposite flanges one. Weld a strip-shaped first reinforcing rib made of cold-formed thin-walled steel plate at the vertical axis of the outer web and arrange it on the same side as the two outer wing plates to form an E-shaped outer keel.

[0011] S3: Prefabricate multiple inner keels. Bend the two sides of the cold-formed thin-walled steel plate by 90 degrees. The bent parts on both sides form two symmetric inner wing plates. The part connecting the two inner wing plates is the inner web. Bend the free sides of the two inner wing plates inward by 90 degrees to form two opposite flanges two. Bend the vertical axis of the inner web into a U-shaped second reinforcing rib and set it on the same side as the inner wing plates to form a C-shaped inner keel. The inner contour dimensions formed by the two outer keels match the outer contour dimensions of the two inner keels.

[0012] S4: After the floor concrete is poured, temporarily fix the two prefabricated inner keels on the positioning connection structure, with the open sides of the two inner keels facing each other.

[0013] S5: Align the open side of one outer keel with the inner wing plate side of the two inner keels. Use auxiliary tools to expand the open ends of the two outer wing plates so that the two outer wing plates cooperate with the two flanges one to clamp the outer side of the inner webs of the two inner keels. Then push the outer keel forcefully towards the inner keels. The two flanges one are respectively embedded into the U-shaped grooves outside the two second reinforcing ribs, and at the same time, the first reinforcing rib is inserted between the two flanges two.

[0014] S6: The principle is the same as S5. Snap the other outer keel into the other side of the two inner keels. At this time, the two flanges one of the other outer keel are respectively embedded into the U-shaped grooves of the two second reinforcing ribs of the inner keels, and the flanges one of the two outer keels are embedded into the U-shaped grooves of the second reinforcing ribs and tightened.

[0015] S7: Weld the lower edges of the two outer keels to the positioning connection structure.

[0016] S8: Pour filling concrete into the cavity formed by the two inner keels and the outer keels.

[0017] Preferably, the cross-sectional shape of the first flanging is set as a right trapezoid, and the slope direction of the free end of the first flanging faces outward.

[0018] Preferably, the width of the U-shaped groove outside the second reinforcing rib is the same as the sum of the thicknesses of the two first flangings.

[0019] Preferably, both the outer keel and the inner keel are galvanized thin-walled steel sections.

[0020] Preferably, the filled concrete is micro-expansion fine aggregate concrete.

[0021] Preferably, a high-range water reducer is incorporated into the filled concrete.

[0022] Preferably, the positioning connection structure includes a connecting steel plate, embedded steel bars, and positioning steel bars. The elevation of the upper surface of the connecting steel plate is the same as the elevation of the upper surface of the floor slab. Multiple embedded steel bars are provided and are uniformly and fixedly connected to the lower surface of the connecting steel plate. At least four positioning steel bars are provided and are fixedly connected to the upper surface of the connecting steel plate. The positioning steel bars are closely attached to the inner side wall of the cavity formed by the outer keel and the inner keel. The lower edge of the outer keel is welded to the upper surface of the connecting steel plate. The installation method steps of the positioning connection structure in S1 are as follows:

[0023] S1.1: Mark the position of the structural column on the floor slab steel bar framework according to the design drawing;

[0024] S1.2: Uniformly weld multiple embedded steel bars to the lower surface of the connecting steel plate;

[0025] S1.3: Place the connecting steel plate at the marked position, and use a level to control the elevation of the upper surface of the connecting steel plate to make the elevation of the upper surface of the connecting steel plate consistent with the elevation of the upper surface of the floor slab;

[0026] S1.4: Weld the connecting steel plate to the floor slab steel bar framework through the embedded steel bars;

[0027] S1.5: Weld multiple positioning steel bars to the upper surface of the connecting steel plate according to the contour of the inner side wall of the inner keel, and make the positioning steel bars perpendicular to the upper surface of the connecting steel plate.

[0028] Preferably, the free end of the embedded steel bar is provided with a hook.

[0029] Preferably, in S4, two prefabricated inner keels are temporarily fixed to the upper surface of the connecting steel plate through multiple positioning steel bars.

[0030] The present invention has the following beneficial effects:

[0031] The positioning steel bars in the positioning connection structure can temporarily support the inner keel and quickly locate the position of the structural column. After the filled concrete solidifies, it can improve the shear strength at the connection between the lower end of the structural column and the connecting steel plate, making the combination of the structural column and the floor slab more stable. The two inner keels are clamped on the connecting steel plate through the positioning steel bars, and the open sides of the two inner keels face each other. Align the open side of an outer keel with the inner wing plate sides of the two inner keels, and then push the outer keel forcefully towards the inner keel. The first flanging is set as a right trapezoid, which can reduce the contact area between the free end of the first flanging and the outer side of the outer wing plate, thereby reducing the friction between the two. When pushing the outer keel towards the inner keel, since the outer keel is a thin-walled section steel and has flexibility, the outer wing plate will produce elastic deformation. The slope provided at the free end of the first flanging can play a guiding role, making it more labor-saving when pushing the outer keel. The two outer wing plates of the outer keel return to their original shape and closely adhere to the inner web of the inner keel. The two first flangings are respectively embedded in the U-shaped grooves on the outer sides of the two second reinforcing ribs. At the same time, the first reinforcing rib is inserted between the two second flangings. Similarly, fix and install the other outer keel on the other side of the two inner keels. At this time, the two first flangings of the other outer keel are respectively embedded in the U-shaped grooves of the two second reinforcing ribs of the inner keel. The first flangings of the two outer keels are embedded in the U-shaped grooves of the second reinforcing ribs and are tightened. Weld the lower edges of the two outer keels to the upper surface of the connecting steel plate. In this way, the inner keel and the outer keel can be quickly installed without being fixed by screws, and the construction is simple, convenient, time-saving and labor-saving. Finally, fill the cavity formed by the two outer keels and the two inner keels with filled concrete. Since the inner walls of the cavity formed by the inner keel and the outer keel are provided with the first reinforcing rib and the second reinforcing rib, the inner walls of the cavity are uneven. The micro-expansion fine aggregate concrete with high-range water reducer added to the filled concrete can increase the fluidity of the concrete while ensuring the concrete strength, making the concrete in the cavity filled densely. At the same time, the micro-expansion fine aggregate concrete has micro-expansion property, which can also squeeze the inner wall of the cavity while filling densely, making the filled concrete combine more closely with the inner keel and the outer keel. The first reinforcing rib and the second reinforcing rib are provided on the inner wall of the cavity, and the filled concrete generates a grip force on the first reinforcing rib and the second reinforcing rib, tightly pulling the outer keel and the inner keel, making the inner keel and the outer keel combine more closely, improving the integrity of the structural column. Moreover, the structural column is a steel-concrete composite structure, having good compressive and flexural tensile properties. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is a schematic structural diagram of a construction method for a building structural column according to the present invention;

[0033] Figure 2 is a schematic structural diagram of an outer keel of a construction method for a building structural column according to the present invention;

[0034] Figure 3Schematic diagram of the inner keel structure of a construction structural column construction method according to the present invention;

[0035] Figure 4 Cross-sectional structure schematic diagram of a construction structural column construction method according to the present invention;

[0036] Figure 5 Positioning schematic diagram of the structural column keel of a construction structural column construction method according to the present invention;

[0037] Figure 6 Positioning connection structure schematic diagram of a construction structural column construction method according to the present invention.

[0038] In the figure: 1, structural column; 11, outer keel; 111, first reinforcing rib; 112, outer web; 113, outer wing plate; 114, first flanging; 12, inner keel; 121, second flanging; 122, inner wing plate; 123, inner web; 124, second reinforcing rib; 13, filled concrete; 2, positioning connection structure; 21, connecting steel plate; 22, embedded steel bar; 23, positioning steel bar; 3, floor slab. Specific embodiments

[0039] The following further elaborates on the present invention in conjunction with the drawings and embodiments, so that those skilled in the art can implement it with reference to the text of the specification.

[0040] The present invention provides a construction structural column construction method, and the specific construction method steps are as follows:

[0041] S1: Before the concrete pouring of the floor slab 3, weld the positioning connection structure 2 to the steel bar framework of the floor slab 3. The positioning connection structure 2 includes a connecting steel plate 21, embedded steel bars 22, and positioning steel bars 23. The elevation of the upper surface of the connecting steel plate 21 is the same as the elevation of the upper surface of the floor slab 3. A plurality of embedded steel bars 22 are provided and evenly fixedly connected to the lower surface of the connecting steel plate 21. The free end of the embedded steel bar 22 is provided with a hook. At least four positioning steel bars 23 are provided and fixedly connected to the upper surface of the connecting steel plate 21. The positioning steel bars 23 are closely attached to the inner side wall of the cavity formed by the outer keel 11 and the inner keel 12. The lower edge of the outer keel 11 is welded to the upper surface of the connecting steel plate 21. The installation method steps of the positioning connection structure 2 in S1 are as follows:

[0042] S1.1: Mark the position marks of the structural column 1 on the steel bar framework of the floor slab 3 according to the design drawings;

[0043] S1.2: Evenly weld a plurality of embedded steel bars 22 to the lower surface of the connecting steel plate 21;

[0044] S1.3: Place the connecting steel plate 21 at the marked position, and use a level to control the elevation of the upper surface of the connecting steel plate 21 so that the elevation of the upper surface of the connecting steel plate 21 is consistent with the elevation of the upper surface of the floor slab 3;

[0045] S1.4: Weld the connecting steel plate 21 to the steel bar framework of the floor slab 3 through the embedded steel bars 22;

[0046] S1.5: Weld multiple positioning steel bars 23 on the upper surface of the connecting steel plate 21 according to the inner wall contour of the inner layer keel 12, and make the positioning steel bars 23 perpendicular to the upper surface of the connecting steel plate 21;

[0047] S2: Prefabricate multiple outer layer keels 11. The outer layer keels 11 are galvanized thin-walled steel sections. Bend both sides of the cold-formed thin-walled steel plate by 90 degrees. The bent parts on both sides form two symmetrical outer wing plates 113. The part connected to the two outer wing plates 113 is the outer web 112. Bend the free sides of the two outer wing plates 113 inward by 90 degrees to form two opposite flanges one 114. The cross-sectional shape of the flange one 114 is set as a right trapezoid, and the slope direction of the free end of the flange one 114 faces outward. Weld a strip-shaped first reinforcing rib 111 made of cold-formed thin-walled steel plate at the vertical axis of the outer web 112 and arranged on the same side as the two outer wing plates 113 to form an E-shaped outer layer keel 11;

[0048] S3: Prefabricate multiple inner layer keels 12. The inner layer keels 12 are galvanized thin-walled steel sections. Bend both sides of the cold-formed thin-walled steel plate by 90 degrees. The bent parts on both sides form two symmetrical inner wing plates 122. The part connected to the two inner wing plates 122 is the inner web 123. Bend the free sides of the two inner wing plates 122 inward by 90 degrees to form two opposite flanges two 121. Bend the vertical axis of the inner web 123 into a U-shaped second reinforcing rib 124 and set it on the same side as the inner wing plates 122 to form a C-shaped inner layer keel 12. The width of the U-shaped groove outside the second reinforcing rib 124 is the same as the sum of the thicknesses of the two flanges one 114. The inner contour dimensions formed by the two outer layer keels 11 match the outer contour dimensions of the two inner layer keels 12;

[0049] S4: After the concrete of the floor slab 3 is poured, temporarily fix the two prefabricated inner layer keels 12 on the upper surface of the connecting steel plate 21 through multiple positioning steel bars 23, and the opening sides of the two inner layer keels 12 are arranged opposite to each other;

[0050] S5: Align the open side of an outer keel 11 with the inner wing plate 122 side of the two inner keels 12. Use auxiliary tools to expand the open ends of the two outer wing plates 113 so that the two outer wing plates 113 cooperate with the two first flanges 114 to clamp the outer sides of the inner webs 123 of the two inner keels 12. Then, push the outer keel 11 forcefully towards the inner keel 12, and the two first flanges 114 are respectively inserted into the U-shaped grooves on the outer sides of the two second reinforcing ribs 124. At the same time, the first reinforcing rib 111 is inserted between the two second flanges 121;

[0051] S6: The principle is the same as that of S5. Snap the other outer keel 11 onto the other side of the two inner keels 12. At this time, the two first flanges 114 of the other outer keel 11 are respectively inserted into the U-shaped grooves of the two second reinforcing ribs 124 of the inner keel 12, and the first flanges 114 of the two outer keels 11 are inserted into the U-shaped grooves of the second reinforcing ribs 124 and clamped tightly;

[0052] S7: Weld the lower edges of the two outer keels 11 to the positioning connection structure 2;

[0053] S8: Pour and fill the cavity formed by the two inner keels 12 and the outer keels 11 with concrete 13. The filling concrete 13 is micro-expansion fine aggregate concrete admixed with a high-range water reducer.

[0054] The present invention provides a structure corresponding to a construction method for a building structural column, including a structural column 1 and a positioning and connecting structure 2. The structural column 1 includes an outer keel 11, an inner keel 12, and filled concrete 13. There are two outer keels 11 and two inner keels 12. The outer keel 11 includes a first reinforcing rib 111, an outer web 112, and outer wing plates 113. The cross-section of the outer keel 11 is in an E shape. The two outer wing plates 113 are arranged parallel to each other, and the two outer wing plates 113 are connected to the two side edges of the outer web 112 and are perpendicular to the outer web 112. The first reinforcing rib 111 is welded at the vertical axis of the outer web 112 and is arranged on the same side as the two outer wing plates 113. The first reinforcing rib 111 can increase the bending resistance of the structural column 1 in the direction perpendicular to the outer web 112. Flanges 114 are respectively provided at the free side edges of the two outer wing plates 113. The two flanges 114 are perpendicular to and opposite to the two outer wing plates 113. The cross-sectional shape of the flange 114 is set as a right trapezoid, and the slope direction of the free end of the flange 114 faces outward. The inner keel 12 includes inner wing plates 122 and an inner web 123. The inner keel 12 is in a C shape. The two inner wing plates 122 are arranged parallel to each other, and the two inner wing plates 122 are connected to the two side edges of the inner web 123 and are perpendicular to the inner web 123. The vertical axis of the inner web 123 is bent into a U shape to form a second reinforcing rib 124 and is arranged on the same side as the inner wing plates 122. The second reinforcing rib 124 can increase the bending strength in the direction perpendicular to the first reinforcing rib 111. Flanges 121 are respectively provided at the free side edges of the two inner wing plates 122. The two flanges 121 are perpendicular to and opposite to the two inner wing plates 122. The inner contour size formed by the two outer keels 11 matches the outer contour size of the two outer keels 11. The open sides of the two outer keels 11 are arranged opposite to each other. The open sides of the two inner keels 12 are arranged opposite to each other and are perpendicular to the opening directions of the two outer keels 11. The parts of the two inner keels 12 located on both sides of the second reinforcing rib 124 are respectively embedded between the first reinforcing rib 111 and the two outer wing plates 113 of the two outer keels 11. At the same time, the two flanges 114 in the two outer keels 11 are respectively embedded in the U-shaped grooves on the outer side surfaces of the second reinforcing ribs 124 of the two inner keels 12. The width of the U-shaped groove on the outer side of the second reinforcing rib 124 is the same as the sum of the thicknesses of the two flanges 114. The two flanges 114 in the U-shaped grooves on the outer side surfaces of the second reinforcing ribs 124 are in contact with each other. The two flanges 121 in the two inner keels 12 are respectively in contact with the two side surfaces of the first reinforcing rib 111. The two flanges 121 can increase the bending and shear resistance at the root of the first reinforcing rib 111 and improve the stability of the first reinforcing rib 111. The outer keel 11 and the inner keel 12 are fixedly connected to the floor slab 3 through the positioning and connecting structure 2. Filled concrete 13 is filled in the cavity formed by the outer keel 11 and the inner keel 12. The filled concrete 13 uses slightly expanded fine aggregate concrete and is admixed with a high-range water reducer. Since the inner walls of the cavity formed by the inner keel 12 and the outer keel 11 are provided with the first reinforcing rib 111 and the second reinforcing rib 124,Make the inner wall of the cavity uneven. Filling the cavity with micro-expansion fine aggregate concrete mixed with high-range water reducer can increase the fluidity of the concrete while ensuring the concrete strength, making the concrete in the cavity filled densely. At the same time, the micro-expansion fine aggregate concrete has micro-expansion property, which can not only tightly fill the cavity but also squeeze the inner wall of the cavity, making the filled concrete 13 combine more closely with the inner layer keel 12 and the outer layer keel 11. The first reinforcing rib 111 and the second reinforcing rib 124 are arranged on the inner wall of the cavity. The filled concrete 13 generates a grip force on the first reinforcing rib 111 and the second reinforcing rib 124, tightly pulling the outer layer keel 11 and the inner layer keel 12, making the inner layer keel 12 and the outer layer keel 11 combine more closely and improving the integrity of the structural column 1.

[0055] The positioning and connecting structure 2 includes a connecting steel plate 21, embedded steel bars 22 and positioning steel bars 23. The elevation of the upper surface of the connecting steel plate 21 is the same as that of the upper surface of the floor slab 3. Multiple embedded steel bars 22 are arranged and fixedly connected to the lower surface of the connecting steel plate 21 evenly. The free end of the embedded steel bar 22 is provided with a hook. At least four positioning steel bars 23 are arranged and fixedly connected to the upper surface of the connecting steel plate 21. The positioning steel bars 23 are closely attached to the inner side wall of the cavity formed by the outer layer keel 11 and the inner layer keel 12. The outer layer keel 11 is welded to the upper surface of the connecting steel plate 21. The positioning steel bars 23 can temporarily support the inner layer keel 12 and can also quickly locate the position of the structural column 1. After the filled concrete 13 solidifies, it can improve the shear strength at the connection between the lower end of the structural column 1 and the connecting steel plate 21, making the structural column 1 and the floor slab 3 combine more stably.

[0056] Both the outer layer keel 11 and the inner layer keel 12 are made of galvanized thin-walled steel sections. The galvanized steel plate is light in weight and good in corrosion resistance, which can extend the service life of the structural column 1. Moreover, the toughness of its coating is strong, which can prevent the inner layer keel 12 and the outer layer keel 11 from being damaged mechanically during transportation and use.

[0057] With the present invention, first, the positioning and connecting structure 2 is fixed to the upper surface of the floor slab 3 through the embedded steel bars 22. Then, the two inner keels 12 are clamped on the connecting steel plate 21 through the positioning steel bars 23. The opening sides of the two inner keels 12 face each other. The opening side of an outer keel 11 is aligned with the inner wing plates 122 of the two inner keels 12. Then, the outer keel 11 is pushed forcefully towards the inner keel 12. The first flange 114 is set as a right trapezoid, which can reduce the contact area between the free end of the first flange 114 and the outer side of the outer wing plate 113, thereby reducing the frictional force therebetween. When the outer keel 11 is pushed towards the inner keel 12, since the outer keel 11 is a thin-walled section steel and has flexibility, the outer wing plate 113 will undergo elastic deformation. The slope provided at the free end of the first flange 114 can play a guiding role, making it more labor-saving when pushing the outer keel 11. The two outer wing plates 113 of the outer keel 11 return to their original shapes and closely adhere to the inner webs 123 of the inner keel 12. The two first flanges 114 are respectively inserted into the U-shaped grooves outside the two second reinforcing ribs 124. At the same time, the first reinforcing rib 111 is inserted between the two second flanges 121. Similarly, the other outer keel 11 is fixedly installed on the other side of the two inner keels 12. At this time, the two first flanges 114 of the other outer keel 11 are respectively inserted into the U-shaped grooves of the two second reinforcing ribs 124 of the inner keel 12. The first flanges 114 of the two outer keels 11 are inserted into the U-shaped grooves of the second reinforcing ribs 124 and are tightened. The lower edges of the two outer keels 11 are welded to the upper surface of the connecting steel plate 21. Finally, the filling concrete 13 is filled into the cavity formed by the two outer keels 11 and the two inner keels 12.

[0058] Although the embodiments of the present invention have been disclosed as above, it is not limited to only the applications listed in the specification and the embodiments. It can be fully applied to various fields suitable for the present invention. For those familiar with the field, additional modifications can be easily achieved. Therefore, without departing from the general concept defined by the claims and the equivalent scope, the present invention is not limited to the specific details and the illustrated examples described herein.

Claims

1. A construction method for building structural columns, characterized in that, The specific construction method steps are as follows: S1: Before the concrete pouring of the floor slab (3), the positioning and connecting structure (2) is welded to the steel bar framework of the floor slab (3); S2: Precast a plurality of outer keels (11). Bend both sides of the cold-formed thin-walled steel plate by 90 degrees. The bent parts on both sides form two symmetrical outer wing plates (113). The part connected to the two outer wing plates (113) is the outer web (112). And bend the free sides of the two outer wing plates (113) inward by 90 degrees to form two opposite flanges one (114). Weld a strip-shaped first reinforcing rib (111) made of cold-formed thin-walled steel plate at the vertical axis of the outer web (112) and arrange it on the same side as the two outer wing plates (113) to form an E-shaped outer keel (11); S3: Precast a plurality of inner keels (12). Bend both sides of the cold-formed thin-walled steel plate by 90 degrees. The bent parts on both sides form two symmetrical inner wing plates (122). The part connected to the two inner wing plates (122) is the inner web (123). And bend the free sides of the two inner wing plates (122) inward by 90 degrees to form two opposite flanges two (121). Bend the vertical axis of the inner web (123) into a U-shaped second reinforcing rib (124) and set it on the same side as the inner wing plates (122) to form a C-shaped inner keel (12). The inner contour dimensions formed by the two outer keels (11) match the outer contour dimensions of the two inner keels (12); S4: After the concrete pouring of the floor slab (3) is completed, temporarily fix the two precast inner keels (12) on the positioning and connecting structure (2). The open sides of the two inner keels (12) are arranged opposite to each other; S5: Align the open side of an outer keel (11) with the inner wing plate (122) side of the two inner keels (12). Use auxiliary tools to expand the open ends of the two outer wing plates (113) so that the two outer wing plates (113) cooperate with the two flanges one (114) to clamp the outer side of the inner web (123) of the two inner keels (12). Then push the outer keel (11) forcefully towards the inner keel (12). The two flanges one (114) are respectively embedded into the U-shaped grooves outside the two second reinforcing ribs (124). At the same time, the first reinforcing rib (111) is inserted between the two flanges two (121); S6: The principle is the same as S5. Snap the other outer keel (11) into the other side of the two inner keels (12). At this time, the two flanges one (114) of the other outer keel (11) are respectively embedded into the U-shaped grooves of the two second reinforcing ribs (124) of the inner keel (12). The flanges one (114) of the two outer keels (11) are embedded into the U-shaped grooves of the second reinforcing ribs (124) and are tightened; S7: Weld the lower edges of the two outer keels (11) to the positioning and connecting structure (2); S8: Pour and fill concrete (13) into the cavity formed by the two inner keels (12) and the outer keels (11).

2. The construction method of a building structural column according to claim 1, characterized in that, The cross-sectional shape of the flange one (114) is set as a right trapezoid, and the slope direction of the free end of the flange one (114) faces outwards.

3. A construction method for building structure columns according to claim 1, characterized in that, The width of the U-shaped groove on the outer side of the second reinforcing rib (124) is the same as the sum of the thicknesses of the two first flanges (114).

4. A construction method for building structure columns according to claim 1, characterized in that, Both the outer keel (11) and the inner keel (12) are galvanized thin-walled steel sections.

5. A construction method for building structure columns according to claim 1, characterized in that, The filled concrete (13) is slightly expanded fine aggregate concrete.

6. A construction method for building structure columns according to claim 1, characterized in that, A high-range water reducer is incorporated into the filled concrete (13).

7. A construction method for building structure columns according to claim 1, characterized in that, The positioning connection structure (2) includes a connection steel plate (21), embedded steel bars (22) and positioning steel bars (23). The elevation of the upper surface of the connection steel plate (21) is the same as the elevation of the upper surface of the floor slab (3). A plurality of the embedded steel bars (22) are provided and are uniformly and fixedly connected to the lower surface of the connection steel plate (21). At least four positioning steel bars (23) are provided and are fixedly connected to the upper surface of the connection steel plate (21). The positioning steel bars (23) are in close contact with the inner side wall of the cavity formed by the outer keel (11) and the inner keel (12). The lower edge of the outer keel (11) is welded to the upper surface of the connection steel plate (21). The installation method steps of the positioning connection structure (2) in S1 are as follows: S1.1: Mark the position of the structural column (1) on the steel bar framework of the floor slab (3) according to the design drawings; S1.2: Uniformly weld a plurality of embedded steel bars (22) to the lower surface of the connection steel plate (21); S1.3: Place the connection steel plate (21) at the marked position, and control the elevation of the upper surface of the connection steel plate (21) with a level to make the elevation of the upper surface of the connection steel plate (21) consistent with the elevation of the upper surface of the floor slab (3); S1.4: Weld the connection steel plate (21) to the steel bar framework of the floor slab (3) through the embedded steel bars (22); S1.5: Weld a plurality of positioning steel bars (23) to the upper surface of the connection steel plate (21) according to the contour of the inner side wall of the inner keel (12), and make the positioning steel bars (23) perpendicular to the upper surface of the connection steel plate (21).

8. A construction method for building structure columns according to claim 7, characterized in that, The free end of the embedded steel bar (22) is provided with a hook.

9. A construction method for building structure columns according to claim 7, characterized in that, In S4, the two prefabricated inner keels (12) are temporarily fixed to the upper surface of the connection steel plate (21) through a plurality of positioning steel bars (23).

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