A steel-concrete composite outer-wrapped column base and its construction method

Abstract

The present invention relates to the technical field of building structure engineering, and provides a steel-concrete composite outsourcing column base and a construction method thereof, comprising: a concrete outsourcing prefabricated part, a column base top stiffening rib, a steel column for fixing to a foundation, and main reinforcement pre-embedded in the foundation; a through hole is provided in the middle portion of the concrete outsourcing prefabricated part for passing the steel column, and steel reinforcement channels are reserved around the periphery for passing the main reinforcement; a steel reinforcement cage is configured inside the concrete outsourcing prefabricated part, and hoop plates are configured at the top and bottom of the steel reinforcement cage; the column base top stiffening rib is used to be arranged on the top of the concrete outsourcing prefabricated part, and is composed of a stiffening rib bottom plate and a vertical plate, the bottom plate is provided with reserved holes for passing the main reinforcement, and the vertical plate is used to fix and connect the bottom plate and the steel column. This solves the problem of assembled construction of outsourcing column bases and can effectively improve the bearing capacity of the column base node.

Description

Technical Field

[0001] The present invention relates to the technical field of building structure engineering, in particular to a steel-concrete combined outer-wrapped column foot and a construction method thereof. Background Art

[0002] The statements in this section merely provide background art related to the present invention and do not necessarily constitute prior art.

[0003] In the column base node part of steel structure buildings, the outsourced column base node reduces deep excavation and burial compared to the embedded column base node, and has better seismic resistance and has better usage advantages.

[0004] Currently, outsourced column base joints are mostly cast-in-place in related projects. This requires on-site reinforcement cage tying and formwork pouring of concrete. This process is complex, slow, and difficult to guarantee quality. With advancements in the industry, prefabricated construction methods are rapidly developing. To achieve the assembly of column base joints, prefabricated cup-shaped or grouting sleeve methods are currently commonly used. The prefabricated cup-shaped method involves complex foundation preparation and is difficult to control in terms of precision. The grouting sleeve method is more mature, but is not directly applicable to outsourced column bases composed of steel pipes and concrete.

[0005] In the actual use of the outsourced column base, looseness easily occurs between the steel column and the outsourced concrete, and the top and bottom of the outsourced concrete are prone to concrete crushing and cracking, thereby reducing or even losing the bearing capacity. Summary of the Invention

[0006] In order to address the shortcomings of the existing technology, the present invention provides a steel-concrete composite outsourced column base and a construction method thereof, which solves the problem of assembled construction of outsourced column bases, can help shorten the construction period and improve the construction quality; at the same time, the design of the components is optimized for the common failure modes of outsourced column bases, which can effectively improve the bearing performance of the column base nodes.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] A first aspect of the present invention provides a steel-concrete composite outer-clad column base.

[0009] A steel-concrete composite outer-clad column base, comprising a concrete outer-clad prefabricated part, a column base top stiffening rib, a steel column for fixing to the foundation, and main reinforcement pre-buried in the foundation;

[0010] A through hole is provided in the middle of the concrete-wrapped prefabricated part for the steel column to pass through, and steel bar channels are reserved around the periphery for the main bars to pass through; a steel bar cage is arranged inside the concrete-wrapped prefabricated part, and hoop plates are arranged on the top and bottom of the steel bar cage;

[0011] The column foot top stiffening rib is used to be set on the top of the concrete-wrapped prefabricated component, and is composed of a stiffening rib bottom plate and a vertical plate. The bottom plate is provided with reserved holes for the main reinforcement to pass through, and the vertical plate is used to fix the bottom plate and the steel column.

[0012] Furthermore, the vertical plate is a right-angled isosceles triangle, one right-angled side of the vertical plate is fixedly connected to the stiffening rib bottom plate, and the other right-angled side is used to be fixedly connected to the side surface of the steel column.

[0013] Furthermore, the stiffening rib bottom plate is divided into two types: long plates and short plates, and the long plates and short plates are used alternately to ensure that all main reinforcements can pass through the corresponding reserved holes.

[0014] Furthermore, the steel cage is formed by welding horizontal stirrups and vertical structural bars together.

[0015] Furthermore, anchor bolts are pre-buried in the foundation;

[0016] The bottom of the steel column is fixedly connected to a bottom plate, and the bottom plate is provided with anchor holes that match the anchor bolts, so that the steel column is fixed on the foundation.

[0017] Furthermore, the foundation is provided with installation grooves for installing concrete-wrapped prefabricated parts and base plates, and the main reinforcement and anchor bolts are pre-embedded in the installation grooves.

[0018] Furthermore, when the main reinforcement is installed, after passing through the steel bar channel and the reserved hole in sequence, the upper end of the main reinforcement is reinforced with a nut.

[0019] Furthermore, the steel cage is arranged between the steel bar channel and the through hole.

[0020] Furthermore, the gap between the steel column and the concrete outer shell prefabricated part needs to be poured with concrete during installation;

[0021] The hole after the main reinforcement passes through needs to be filled with cement mortar.

[0022] A second aspect of the present invention provides a construction method for a steel-concrete composite outwrapped column foot as described in the first aspect, comprising the following steps:

[0023] Embed the main reinforcement in the foundation;

[0024] Hoist the concrete-wrapped prefabricated parts to the installation location, and pass the main reinforcement through the steel bar holes reserved in the concrete-wrapped prefabricated parts;

[0025] Lift the steel column to the installation location and insert it into the through hole of the concrete-wrapped prefabricated part from top to bottom;

[0026] After hoisting the concrete outer shell prefabricated parts to a certain height, lower the steel column to the foundation, and after fixing the steel column to the foundation, lower the concrete outer shell prefabricated parts;

[0027] Install the column foot top stiffening rib on the top of the concrete-wrapped prefabricated part, fix the upper part of the main reinforcement through the reserved hole of the stiffening rib bottom plate, and fix the vertical plate to the steel column.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] 1. The steel-concrete composite outsourced column base described in the present invention focuses on the outsourced connection between the steel tube concrete column and the foundation. The relevant components can be processed in the factory. A standard prefabricated concrete module for the outsourced column base has been developed, which fully guarantees the construction quality and takes advantage of the assembly advantages of prefabricated parts. It is superior to the existing outsourced column base in terms of construction efficiency.

[0030] 2. The steel-concrete composite outsourced column base described in the present invention has been designed and optimized for the common failure modes of outsourced column bases. Under the premise of ensuring ease of assembly, the use of stiffening ribs and hoop plates redistributes the force transmission of the column base, improves the bearing capacity and energy consumption performance of the column base node, strengthens the seismic resistance of the column base node, and simplifies the connection method, making the assembly process simple and easy. The stiffening ribs and shear-resistant hoop plates on the top of the column base can effectively connect the steel column, main reinforcement and concrete outsourced prefabricated parts, thereby improving the bearing capacity.

[0031] 3. The steel-concrete composite outsourced column base described in the present invention uses column base top stiffening ribs on the top of the concrete outsourced column base. The column base top stiffening ribs connect the steel column, the concrete outsourced prefabricated parts and the main reinforcement, which greatly improves the integrity of the outsourced column base. The installation of the column base top stiffening ribs allows the force to be more evenly transmitted to the outsourced concrete, and the plastic strain of the concrete is significantly reduced.

[0032] 4. The steel-concrete composite outsourced column base described in the present invention has a column base top stiffening rib that can transfer part of the horizontal force into an axial force on the column base concrete when the column is subjected to lateral force, thereby reducing the crushing damage of the steel column to the top concrete.

[0033] 5. The steel-concrete composite outer-wrapped column base described in the present invention has a stiffening rib bottom plate of the column base top stiffening rib that is more convenient for installing nuts and fixing the upper part of the main reinforcement, and is also more conducive to dispersing the force on the top of the outer-wrapped concrete when the main reinforcement is in effect.

[0034] 6. This embodiment provides a steel-concrete composite outer column base, which is equipped with reinforcing hoop plates at the top and bottom of the outer column base where the force is weak. Compared with the traditional top hoop shear reinforcement technology, when the column top is subjected to horizontal lateral force, the hoop plates provide better shear resistance in the horizontal direction on the one hand; on the other hand, they can reduce the impact of the yielding of the main reinforcement on the concrete root in the axial direction, and have a good preventive effect on the two forms of failure; the use of hoop plates also helps to position the structural reinforcement to facilitate faster forming of the steel cage. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The accompanying drawings, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments and descriptions of the present invention are used to explain the present invention and do not constitute an improper limitation to the present invention.

[0036] Figure 1 This is a structural diagram of a steel-concrete composite outer-wrapped column foot in Example 1 of the present invention;

[0037] Figure 2 A perspective view of a steel-concrete composite outer-clad column base in Example 1 of the present invention;

[0038] Figure 3 This is a structural diagram of a concrete-wrapped prefabricated component in Example 1 of the present invention;

[0039] Figure 4 This is a structural diagram of a steel cage in Example 1 of the present invention;

[0040] Figure 5 This is a basic structural diagram of the first embodiment of the present invention;

[0041] Figure 6 This is a structural diagram of the steel column and base plate in Example 1 of the present invention;

[0042] FIG7( a ) is a structural diagram of the column foot top stiffening ribs in the first embodiment of the present invention, wherein the bottom plate is a long plate;

[0043] FIG7( b ) is a structural diagram of the column foot top stiffening ribs in the first embodiment of the present invention, wherein the bottom plate is a short plate;

[0044] FIG7( c ) is a schematic diagram of the installation of the column foot top stiffening rib in the first embodiment of the present invention;

[0045] FIG8( a ) is a first schematic diagram of a common failure mode of the outsourced column base in the first embodiment of the present invention;

[0046] FIG8( b ) is a second schematic diagram of a common failure mode of the outsourced column base in the first embodiment of the present invention;

[0047] FIG8( c ) is a third schematic diagram of common failure modes of the outsourced column base in the first embodiment of the present invention;

[0048] Figure 9 This is a force diagram of a steel-concrete composite outer-wrapped column base in Example 1 of the present invention;

[0049] FIG10( a ) is a stress cloud diagram of a conventional outsourced column base in Example 1 of the present invention;

[0050] FIG10( b ) is a stress cloud diagram of a steel-concrete composite outer-wrapped column base in Example 1 of the present invention;

[0051] FIG11( a ) is a time history graph of column foot reaction force in Example 1 of the present invention;

[0052] FIG11( b ) is a hysteresis curve diagram of the column foot in the first embodiment of the present invention.

[0053] Among them, 1. Steel column, 2. Foundation, 3. Bottom plate, 4. Concrete-wrapped prefabricated parts, 5. Main reinforcement, 6. Column foot top stiffening rib, 7. Hoop plate, 8. Stirrups, 9. Structural reinforcement, 10. Anchor bolt, 21. Installation groove, 31. Anchor bolt hole, 41. Through hole, 42. Steel bar channel, 61. Stiffener bottom plate, 62. Vertical plate, 63. Reserved hole. DETAILED DESCRIPTION

[0054] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0055] It should be noted that the experimental methods described in the following embodiments are conventional methods unless otherwise specified, and the reagents and materials are commercially available unless otherwise specified; in the description of the present invention, the terms "horizontal", "longitudinal", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0056] In the absence of conflict, the embodiments of the present invention and the features thereof may be combined with each other.

[0057] Example 1

[0058] like Figure 1 and Figure 2As shown, the first embodiment of the present invention provides a steel-concrete combined outsourcing column base, comprising: a steel column 1, a base plate 3, a concrete outsourcing prefabricated part 4, a main reinforcement 5, a column base top stiffening rib 6 and an anchor bolt 10.

[0059] like Figure 6 As shown, a bottom plate 3 is pre-welded to the bottom of the steel column 1. The size and thickness of the bottom plate 3 are designed according to relevant specifications and taking into account the design axial force and the local compressive area of the concrete.

[0060] like Figure 5 and Figure 6 As shown, the base plate 3 is provided with anchor holes 31 , and the base plate 3 is connected and fixed to the foundation 2 through the cooperation between the reserved anchor bolts 10 on the foundation 2 and the anchor holes 31 .

[0061] Among them, considering the bending bearing capacity, the anchor bolts 10 are selected as standard specifications.

[0062] like Figure 3 As shown, the concrete outer shell prefabricated part 4 is a standard prefabricated module of square ring reinforced concrete. The outer shell height and outer shell thickness of the concrete outer shell prefabricated part 4 are selected according to relevant specifications. The middle part of the concrete outer shell prefabricated part 4 is left empty according to the size of the base plate, that is, a through hole 41 is provided in the middle part of the concrete outer shell prefabricated part 4 to facilitate the installation of the steel column 1 and the base plate 3 from top to bottom into the concrete outer shell prefabricated part 4.

[0063] like Figure 3 As shown, steel bar holes 42 are reserved on the four sides of the concrete-wrapped prefabricated part 4, and the lower end of the load-bearing main reinforcement 5 is embedded in the foundation 2. During installation, the main reinforcement 5 passes through the steel bar holes 42 and the reserved holes 63 of the stiffening rib 6 at the top of the column foot in sequence, and then the upper end of the main reinforcement 5 is reinforced with bolts.

[0064] like Figure 4 As shown, hoop plates 7, stirrups 8 and structural reinforcements 9 are arranged inside the concrete-wrapped prefabricated part 4. Stirrups 8 are arranged horizontally inside the concrete-wrapped prefabricated part 4 according to the force requirements, and structural reinforcements 9 are arranged vertically to form a steel cage. Hoop plates 7 are arranged at the top and bottom of the steel cage where the force of the outer column foot is weak to enhance the bending and shear bearing capacity of the column foot.

[0065] like Figure 2 As shown, the steel cage is arranged between the steel channel 42 and the through hole 41.

[0066] As shown in Figures 7(a), 7(b), and 7(c), a column foot top stiffening rib 6 is installed at the top of the outer column foot. This stiffening rib 6 is installed atop the concrete outer precast member 4 and is fixedly connected to the side of the steel column 1. It consists of a fixedly connected stiffening rib base plate 61 and a vertical plate 62. The stiffening rib base plate 61 is rectangular and has pre-set holes 63. The portion connected to the top surface of the concrete outer precast member 4 is secured with nuts after the main reinforcement 5 extends through the pre-set holes 63.

[0067] like Figure 1 As shown, the stiffening rib vertical plate 62 is connected and fixed to the side of the steel column 1 by welding. Specifically, the vertical plate 62 is a right-angled isosceles triangle, one right-angled side of the vertical plate 62 is fixedly connected to the stiffening rib bottom plate 61, and the other right-angled side is used to be fixedly connected to the side of the steel column 1.

[0068] As shown in Figures 7(a), 7(b), and 7(c), the stiffening rib base plate 61 is divided into two types: long and short. These two types of stiffening rib structures are used in a cross-combination to ensure that all main bars 5 can pass through the corresponding stiffening rib reserved holes 63. If the stiffening rib base plate 61 is a long plate, the length of the long plate is the same as the length of the concrete outer precast member 4, and the width of the long plate is half the difference between the width of the concrete outer precast member 4 and the width of the through hole 41. If the stiffening rib base plate 61 is a short plate, the length of the short plate is the length of the concrete outer precast member 4 minus twice the width of the long plate, and the width of the short plate is the same as the width of the long plate.

[0069] like Figure 5 and Figure 6 As shown, the installation groove 21 reserved in the foundation 2 is equivalent to the bottom area of the concrete outer shell prefabricated part 4, and the groove depth is the same as the thickness of the bottom plate 3. After the steel column 1 and the bottom plate 3 are installed in the installation groove 21, concrete is poured in the installation groove 21 for leveling, and then the concrete outer shell prefabricated part 4 is installed to achieve wet connection between the outer shell column foot and the foundation 2; after the concrete outer shell prefabricated part 4 is installed, concrete is poured in the gap between the steel column 1 and the concrete outer shell prefabricated part 4 to achieve a firm connection between the steel column 1 and the concrete outer shell prefabricated part 4; steel bar channels 42 are reserved on the concrete outer shell prefabricated part 4, and after the main reinforcement 5 passes through, cement mortar is filled along the steel bar channels 42 to achieve the overall connection and fixation of the column foot; finally, the long plate and short plate of the column foot top stiffening rib 6 are used crosswise and arranged on the top of the concrete outer shell prefabricated part 4. After the main reinforcement 5 extends out of the reserved hole 63, it is fixed with nuts, and the stiffening rib vertical plate 62 is connected and fixed to the side of the steel column 1 by welding.

[0070] As shown in Figures 8(a), 8(b), and 8(c), when the column top is subjected to a horizontal lateral force V, common failure modes of the wrapped column foot include: crushing of the outer top concrete a, diagonal cracks caused by the shear force of the outer concrete b, failure of the main reinforcement in the anchorage area of the outer concrete c, and tensile cracking of the concrete d due to yielding of the main reinforcement at the root of the outer concrete.

[0071] This embodiment provides a steel-concrete composite outer column base, in which the top and bottom of the outer column base are weakly stressed and reinforced with hoop plates 7. Compared with the traditional top hoop shear reinforcement technology, Figure 9 As shown in the figure, when the column top is subjected to a horizontal lateral force V, the hoop plate 7 provides better shear resistance in the transverse direction; on the other hand, it can reduce the impact of the yielding of the main reinforcement on the concrete root in the axial direction, and has a good preventive effect on both types of failure. The use of the hoop plate 7 also helps to position the structural reinforcement to facilitate faster forming of the steel cage.

[0072] The present embodiment provides a steel-concrete composite outsourcing column base, in which a column base top stiffening rib 6 is used at the top of the concrete outsourcing column base. First, as shown by the comparison of the stress cloud diagrams of Figure 10(a) and Figure 10(b) (Figure 10(a) shows that under certain conditions, the plastic deformation of the concrete after being subjected to stress is only concentrated at the bottom and is large (damage has occurred); Figure 10(b) shows that after the installation of the stiffening ribs, the concrete under the same conditions evenly participates in the stress deformation, and the plastic strain is significantly smaller than that of the conventional column base node), the column base top stiffening rib 6 connects the steel column (steel column 1), the concrete outsourcing prefabricated part 4 and the main reinforcement 5, which greatly improves the integrity of the outsourcing column base. The installation of the column base top stiffening rib 6 makes the stress more evenly transmitted to the outsourcing concrete, and the plastic strain of the concrete is significantly reduced; secondly, the top of the conventional outsourcing column base is the most dangerous section for bending moment, and the column base top stiffening rib 6 can transfer part of the horizontal force to the outsourcing concrete when the column is subjected to lateral force. The axial force on the column base concrete can reduce the crushing damage of the steel column to the top concrete; thirdly, the stiffening rib bottom plate 61 of the column base top stiffening rib 6 is more convenient for installing nuts and fixing on the upper part of the main reinforcement 5, and is also more conducive to the dispersion of the force on the top of the outsourced concrete when the main reinforcement 5 is in effect; finally, the reason why the conventional outsourced column base is not convenient for using the column base top stiffening rib is that it is necessary to wait for the outsourced concrete to solidify and have a certain strength before installation and construction, and the installation bolts must also be embedded in advance. After installation, the improvement of the structural force and integrity is not as good as the steel-concrete combined outsourced column base provided in this embodiment. Therefore, the steel-concrete combined outsourced column base provided in this embodiment further highlights the advantages of prefabrication of the concrete outsourcing part and the use of assembled construction in the use of the column base top stiffening rib.

[0073] This embodiment provides a steel-concrete composite outsourced column base, which has clear force transmission at the column base node, reliable connection, and convenient assembly. In comparison with the traditional outsourced column base connection, two new designs, namely, a column base top stiffening rib 6 and a shear hoop plate 7, are adopted. In addition, the shear and bending bearing capacity and seismic performance of the column base node are improved through the combined action of prestressed anchor rods and prestressed tendons as needed.

[0074] As shown in Figures 11(a) and 11(b), based on relevant tests and finite element simulation results, this example provides a steel-concrete composite outer column base. The column base top stiffener 6 and shear hoop plate 7 adopted can effectively connect the steel column, main reinforcement and concrete outer prefabricated parts. The hysteresis curve simulation results under the forward displacement load show that the bearing capacity is improved by more than 40%.

[0075] Example 2

[0076] The second embodiment of the present invention provides a construction method of a steel-concrete composite outer-wrapped column base as in the first embodiment, comprising the following steps:

[0077] Step 1: prefabricate steel columns 1, base plates 3, concrete outer prefabricated parts 4, and column foot top stiffening ribs 6;

[0078] Step 2: embed the main reinforcement 5 and anchor bolts 10 in the foundation 2, and reserve installation grooves 21 on the foundation 2;

[0079] Step 3: hoist the concrete outer shell prefabricated part 4 to the installation position (just above the installation slot 21), and pass the embedded main reinforcement 5 through the steel bar channel 42 reserved in the concrete outer shell prefabricated part;

[0080] Step 4: Weld the bottom plate 3 to the steel column 1, hoist the steel column 1 and the bottom plate 3 to the top of the installation slot 21, and insert the steel column 1 into the through hole 41 of the concrete outer prefabricated part 4 from top to bottom;

[0081] Step 5: Lift the concrete outer prefabricated part 4 to a certain height and fix it, then drop the steel column 1 and the base plate 3 into the installation groove 21, pass the reserved anchor bolts 10 through the anchor bolt holes 31 of the base plate 3, install and fix the base plate 3 through the reserved anchor bolts 10, fix the connection between the steel column 1 and the base plate 3 and the foundation 2, and pour concrete in the installation groove 21 for leveling;

[0082] Step 6: Drop the concrete-wrapped prefabricated part 4 into the installation groove 21 and fill the gap 41 between the steel column 1 and the concrete-wrapped prefabricated part 4 with concrete;

[0083] Step 7: Pour cement slurry into the reserved steel bar channel 42, and install the column base top stiffening rib 6 on the top of the concrete outer prefabricated part 4, so that the upper part of the main reinforcement 5 passes through the reserved hole 63 of the column base top stiffening rib 6, and fix the upper part of the main reinforcement 5 with nuts, and fix the vertical plate to the steel column.

[0084] The various technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the various technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0085] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A steel-concrete composite outsourced column base, characterized by: It includes precast concrete parts, stiffening ribs on the top of the column foot, steel columns for fixing to the foundation and main reinforcement embedded in the foundation; A through hole is provided in the middle of the concrete-clad prefabricated part for the passage of the steel column, and steel bar channels are reserved around the periphery for the passage of the main reinforcement. A steel bar cage is arranged inside the concrete-clad prefabricated part, which is formed by welding horizontal stirrups and vertical structural reinforcement. The steel bar cage is arranged between the steel bar channel and the through hole. Hoop plates are provided at the top and bottom of the steel bar cage. When the column top is subjected to a horizontal lateral force V, the hoop plates provide better shear resistance in the transverse direction and can also reduce the impact of the main reinforcement yield on the concrete root in the axial direction. The use of the hoop plates also helps to position the structural reinforcement, so as to facilitate faster forming of the steel bar cage. The column foot top stiffening rib is used to be set on the top of the concrete outer prefabricated component, and is composed of a stiffening rib bottom plate and a vertical plate. The bottom plate is provided with a reserved hole for the main reinforcement to pass through, and the vertical plate is used to fix the bottom plate and the steel column; When the main reinforcement is installed, it passes through the steel bar channel and the reserved hole in sequence, and the upper end of the main reinforcement is reinforced with a nut.

2. The steel-concrete composite outer-wrapped column base according to claim 1, characterized in that: The vertical plate is a right-angled isosceles triangle, one right-angled side of the vertical plate is fixedly connected to the stiffening rib bottom plate, and the other right-angled side is used to be fixedly connected to the side surface of the steel column.

3. The steel-concrete composite outer-wrapped column base according to claim 1, characterized in that: The stiffening rib bottom plate is divided into two types: long plate and short plate. The long plate and the short plate are used alternately to ensure that all main reinforcements can pass through the corresponding reserved holes.

4. The steel-concrete composite outer-wrapped column base according to claim 1, characterized in that: Anchor bolts are also pre-buried in the foundation; The bottom of the steel column is fixedly connected to a bottom plate, and the bottom plate is provided with anchor holes that match the anchor bolts, so that the steel column is fixed on the foundation.

5. The steel-concrete composite outer-wrapped column base according to claim 4, characterized in that: The foundation is provided with an installation groove for installing concrete-wrapped prefabricated parts and a bottom plate, and the main reinforcement and anchor bolts are pre-buried in the installation groove.

6. The steel-concrete composite outer-wrapped column base according to claim 1, characterized in that: The gap between the steel column and the concrete prefabricated parts needs to be poured with concrete during installation; The hole after the main reinforcement passes through needs to be filled with cement mortar.

7. A construction method for a steel-concrete composite outsourced column foot according to any one of claims 1 to 6, characterized in that: The steps include: Embed the main reinforcement in the foundation; Hoist the concrete-wrapped prefabricated parts to the installation location, and pass the main reinforcement through the steel bar holes reserved in the concrete-wrapped prefabricated parts; Hoist the steel column to the installation location and insert it into the through hole of the concrete-wrapped prefabricated part from top to bottom; After hoisting the concrete outer shell prefabricated parts to a certain height, lower the steel column to the foundation, and after fixing the steel column to the foundation, lower the concrete outer shell prefabricated parts; Install the column foot top stiffening rib on the top of the concrete-wrapped prefabricated part, fix the upper part of the main reinforcement through the reserved hole of the stiffening rib bottom plate, and fix the vertical plate to the steel column.

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