Inserting column end bearing type column base joint

Abstract

The utility model relates to an inserting column end bearing type column base node which comprises a steel pipe concrete column, the steel pipe concrete column is composed of a steel pipe core column, peripheral reinforced concrete, a bottom plate and a bottom wrapping steel plate, the steel pipe core column extends downwards from the bottom face of the peripheral reinforced concrete, and the bottom plate is annularly welded to the periphery of the steel pipe core column on the bottom face of the peripheral reinforced concrete. The bottom wrapping steel plate wraps the periphery of the bottom of the peripheral reinforced concrete, a plurality of first stiffening ribs are welded to each side of the bottom wrapping steel plate and connected with the steel pipe core column in a welded mode, and the bottom plate extends outwards in the radial direction from the bottom wrapping steel plate. And a cup opening is reserved in the column foot foundation, and a plurality of groups of anchor bolts are pre-buried around the cup opening. The end of the concrete filled steel tubular column is supported on the top of the column foot foundation, the structure is simple, the anti-seismic performance is excellent, the quality is reliable, the construction speed is high, and the node construction method is high in cost performance.

Description

Technical Field

[0001] This utility model relates to the field of building structure technology, and in particular to prefabricated structures, specifically to a column base joint with insert end bearing. Background Technology

[0002] Column bases are crucial nodes connecting the superstructure and foundation in steel structures, playing a key role in determining their stability and load-bearing capacity. They effectively anchor the column and transfer axial forces, bending moments, and shear forces from the column's lower end to the foundation, ensuring a seamless connection between the superstructure and the foundation.

[0003] Prefabricated buildings are divided into prefabricated concrete structures and prefabricated steel structures. Prefabricated concrete structures typically use cast-in-place construction for the underground portion, with the foundation and column bases either integrally cast or using insert-type column bases. Integral cast-in-place column bases offer high rigidity and good overall integrity, but involve a large amount of on-site construction and a long construction period, which does not align with the development concept of prefabricated buildings. Insert-type column bases have low rigidity and poor overall integrity, making them difficult to design for columns with high internal forces at the column base, and often failing to meet requirements. Furthermore, temporary fixing measures are needed during construction to ensure column stability, and positioning and leveling are difficult.

[0004] Prefabricated steel structure column base joints mainly come in three types: exposed, externally enclosed, and embedded. For example... Figure 11 As shown, exposed column bases mainly consist of a base plate, stiffening ribs (stiffening plates), anchor bolts, and anchor bolt support brackets. During construction, the anchor bolts are positioned according to the drawings using the anchor bolt support brackets. Then, foundation concrete is poured. After the foundation concrete hardens, the upper steel pipe column is installed, aligned, leveled, and fixed, followed by a second pour of grout. Encased column bases are formed by encasing the column base in reinforced concrete. Generally, the side length of the column base cross-section is 400-600mm larger than the diameter of the round steel pipe. Encased column bases require more on-site reinforcement binding, and the additional reinforcement at the column base intersects with the foundation reinforcement, making the construction process cumbersome and the construction period longer. Embedded column bases involve first fixing the steel pipe column in the reinforced concrete foundation or foundation beam as required, then pouring concrete to directly embed the column base into the reinforced concrete foundation or foundation beam.

[0005] In comparison, exposed column bases are relatively simple in construction but have a limited range of applications. They are generally suitable for single-story factories or multi-story buildings in low-seismic zones, where the internal forces within the column base are relatively small. The bending moment and tensile force at the column base are entirely borne by the anchor bolts, which do not bear shear force. Shear force is borne by the friction between the column base and the foundation or by the use of shear keys. Exposed column bases have lower stiffness and bearing capacity than other column base types, resulting in poor seismic performance. Enclosed column bases have a relatively complex construction, with the column base cross-section side length being 400-600mm larger than the diameter of the circular steel pipe and entirely exposed. They occupy more building space and are not favored by architects, thus their application is relatively limited. They are generally used in parking lots, warehouses, and factories to prevent vehicle damage. This type of column base is suitable for collision situations, but the construction and binding of reinforcing bars are complicated due to the influence of shear studs and foundation reinforcement, resulting in slow construction speed and long construction period. It is not suitable when the internal force of the column base is large, as the column base size is larger and occupies more building space, making it less acceptable to architects. Embedded column bases insert a circular steel pipe column into the foundation. The column base exerts a punching shear effect on the foundation slab, requiring a thicker foundation slab and higher cost. The circular steel pipe column collides with the foundation reinforcement, necessitating holes in the side wall of the circular steel pipe column to allow the foundation reinforcement to pass through. This results in slow construction speed and long construction period. Embedded column bases are often used in high-rise buildings or when the internal force at the column base is large. They offer high rigidity, high load-bearing capacity, and good seismic performance. However, embedded column bases have a complex structure, requiring the steel column to be inserted into the foundation at a considerable depth. Combined with the height required for foundation punching shear calculations, this generally requires a thicker foundation, increasing foundation cost. Furthermore, the steel column conflicts with the reinforcement in the foundation, and when the steel column cross-section is large, holes need to be drilled in the embedded portion of the foundation to allow the foundation reinforcement to pass through, making construction inconvenient.

[0006] Furthermore, all three types of column bases require temporary supports and other fixing measures during construction, making positioning and leveling inconvenient. Therefore, researching a suitable wall and column base joint for prefabricated steel pipe concrete structures is of great significance. Summary of the Invention

[0007] In view of the shortcomings of the existing technology, this utility model proposes a column base joint with insert end bearing, which can realize the column end bearing connection at the joint, so as to solve the defects of the existing column base and wall base joints.

[0008] The technical solution of this utility model is as follows:

[0009] A type of end-bearing column base joint includes:

[0010] A steel-concrete composite column consists of a steel core column, an outer reinforced concrete enclosure, a base plate, and a bottom outer steel plate. The steel core column extends downward from the bottom surface of the outer reinforced concrete enclosure. The base plate is circumferentially welded to the outer perimeter of the steel core column on the bottom surface of the outer reinforced concrete enclosure. The bottom outer steel plate forms a wrap around the bottom perimeter of the outer reinforced concrete enclosure within a predetermined height range, and several first stiffening ribs are welded on each side. The several first stiffening ribs are welded to the steel core column, and the base plate extends radially outward from the bottom outer steel plate.

[0011] The column base has a pre-reserved cup opening, and multiple sets of anchor bolts are pre-embedded around the cup opening;

[0012] The steel-concrete composite column is situated on the column base foundation, wherein the downwardly extending portion of the steel core column is inserted into the cup opening, the radially outwardly extending portion of the base plate is anchored and fixed by anchor bolts, and grouting material is injected between the bottom of the base plate and the top of the column base foundation and into the cup opening, so that the downwardly extending portion of the steel core column is anchored in the cup opening, and the end of the steel-concrete composite column rests on the top of the column base foundation.

[0013] Preferably, the base plate includes an inner base plate, which is circumferentially welded between the bottom outer steel plate and the steel pipe core column, and the inner base plate is provided with circumferentially through-holes for reinforcing bars, and the vertical reinforcing bars in the outer reinforced concrete are inserted into the through-holes for reinforcing bars and welded to the inner base plate by through-hole plug welding.

[0014] Preferably, the base plate includes an outer base plate, which is welded to the periphery of the bottom outer steel plate and extends radially outward, and the outer base plate has pre-set anchor bolt holes.

[0015] Preferably, a plurality of second stiffening ribs are welded to the outer bottom plate, and the plurality of second stiffening ribs are welded to the bottom outer steel plate.

[0016] Preferably, the steel core column is welded with a first ring reinforcement bar extending downward from the bottom of the outer reinforced concrete, and multiple sets of the first ring reinforcement bars are evenly distributed along the height.

[0017] Preferably, at the bottom of the base plate, a shear sleeve is welded to the periphery of the steel pipe core column. The top of the shear sleeve is connected to the base plate by a penetration weld, the bottom is connected to the steel pipe core column by a fillet weld, and the middle is connected to the steel pipe core plunger by a weld.

[0018] Preferably, anchor bars are pre-embedded at the bottom of the cup-shaped opening of the column base. Multiple sets of anchor bars are evenly distributed around the downwardly extended portion of the steel pipe core column, and the tensile bearing capacity of the anchor bars is not lower than the tensile bearing capacity of the steel pipe core column.

[0019] Preferably, the anchor bar is an L-shaped bar, with the L-shaped bent section pre-embedded and anchored in the concrete of the column base, and the L-shaped vertical section extending out of the cup opening and surrounding the downwardly extended portion of the steel pipe core column.

[0020] Preferably, the cup-shaped outline of the column base is embedded with a non-removable steel pipe as the cup-shaped opening, and the inner and outer walls of the non-removable steel pipe are both welded with second ring reinforcements. Multiple sets of the second ring reinforcements are evenly distributed along the height of the inner and outer walls of the non-removable steel pipe. The shear bearing capacity of the second ring reinforcements and the tensile bearing capacity of the non-removable steel pipe are not lower than the tensile ultimate bearing capacity of the steel pipe core column.

[0021] Preferably, the insert-end bearing column base joint includes the following forms:

[0022] Independent column base node, a steel pipe concrete column is inserted into the cup-shaped opening of the column base foundation;

[0023] The irregular column base node consists of multiple steel pipe core columns arranged in a steel pipe concrete arrangement to form an irregular cross section, which together with the surrounding reinforced concrete forms an irregular steel pipe concrete column, inserted into the cup-shaped opening of the column base foundation.

[0024] At the shear wall foot joint, multiple steel pipe core columns are arranged in a straight section with steel pipe concrete, forming a shear wall with the surrounding reinforced concrete, and inserted into the cup-shaped opening of the wall foot foundation.

[0025] The advantages of this utility model compared to the prior art are as follows: This utility model proposes a column base joint with an insert-type column and an end-bearing type. The column base joint is composed of an insert-type part and an end-bearing part. The core column part of the component is inserted into the foundation with a reserved cup opening, and the non-core column part of the component is connected to the foundation through the end-bearing column base. It has the following advantages:

[0026] The new type of joint combines the advantages of both exposed and embedded joints while avoiding their disadvantages. The construction of the joint is the same as that of exposed wall and column bases. Anchor bolts can be used as both a construction measure and a normal structural element, making it economical, reasonable, and simple to construct. The foundation and its corresponding floor position can be constructed in advance, without waiting for the precast wall and column to arrive on site, which is more site-friendly (embedded and external wall and column base joints require the construction of precast wall and column first, followed by the pouring of concrete for the foundation and the corresponding floor position, resulting in a long construction period and a chaotic construction site for the wall and column).

[0027] The new type of node steel pipe core column adopts an insert type, and its seismic performance is the same as that of embedded wall and column bases, with excellent seismic performance.

[0028] The round steel pipe is inserted internally, and the concrete end bearing is external to the pipe. The reserved cup opening size is small, which does not conflict with the foundation reinforcement and has no impact on the construction of the foundation and foundation beams. The construction speed is fast and saves construction time. The structure is simple, and the steel pipes are all completed in the factory without dismantling. The degree of industrialization is high and meets the requirements of prefabricated buildings. Compared with the embedded foundation, the foundation section thickness is greatly reduced, reducing the foundation construction cost.

[0029] It should be understood that the implementation of any embodiment of this utility model does not mean that it will simultaneously possess or achieve multiple or all of the above-mentioned beneficial effects. Attached Figure Description

[0030] To more clearly illustrate the embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0031] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportional relationships, or adjustments to the size, without affecting the effects and purposes that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.

[0032] Figure 1 This is a schematic diagram of the insert-end bearing column base node before assembly in Embodiment 1 of this utility model;

[0033] Figure 2 This is a schematic diagram of the assembled column base node of the first embodiment of the present invention;

[0034] Figure 3 This is a plan view of the insert-end bearing type column base node according to Embodiment 1 of this utility model;

[0035] Figure 4 This is a schematic diagram of the insert-end bearing column base node before assembly in Embodiment 2 of this utility model;

[0036] Figure 5 This is a schematic diagram of the assembled column base node of the insert-end bearing type according to Embodiment 2 of this utility model;

[0037] Figure 6 This is a schematic plan view of the insert-end bearing type column base node according to Embodiment 2 of this utility model;

[0038] Figure 7This is a schematic plan view of the insert-end bearing type column base node according to Embodiment 3 of this utility model;

[0039] Figure 8 This is a schematic plan view of the insert-end bearing type column base node according to Embodiment 4 of this utility model;

[0040] Figure 9 This is a plan view of the insert-end bearing column base node according to Embodiment 5 of this utility model;

[0041] Figure 10 This is a plan view of the insert-end bearing column base node of Embodiment Six of this utility model;

[0042] Figure 11 The diagram shows the existing column base node structure, where (a) is exposed, (b) is enclosed, and (c) is embedded.

[0043] Marked in the image:

[0044] 10 steel-concrete composite columns, 20 column bases;

[0045] 11. Steel pipe core column, 12. Surrounding reinforced concrete, 121. Vertical steel bar, 13. Base plate, 131. Inner base plate, 132. Outer base plate, 14. Bottom outer steel plate, 15. First stiffening rib, 16. Second stiffening rib, 17. First ring reinforcement, 18. Shear sleeve.

[0046] Anchor bolt 21, grouting material 22, anchor bar 23, non-removable steel pipe 24, second ring bar 25.

[0047] The same or corresponding marks in the diagram indicate the same or corresponding parts. Detailed Implementation

[0048] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. Here, the illustrative embodiments of this utility model and their descriptions are used to explain this utility model, but are not intended to limit this utility model.

[0049] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0050] It should be understood that the terms "comprising / including," "consisting of," or any other variations are intended to cover non-exclusive inclusion, such that a product, apparatus, process, or method that comprises a list of elements includes not only those elements but may also include, where necessary, other elements not expressly listed, or elements inherent to such a product, apparatus, process, or method. Without further limitation, an element defined by the phrases "comprising / including," "consisting of," does not exclude the presence of additional identical elements in the product, apparatus, process, or method that includes said element.

[0051] It should also be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device, component or structure referred to must have a specific orientation, be constructed or operated in a specific orientation, and should not be construed as a limitation on this utility model.

[0052] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0053] Given the lessons learned from the experience that non-embedded column bases, especially those above ground, are easily damaged in earthquakes, prefabricated steel pipe concrete wall columns should adopt insert-type end-bearing wall bases and column bases, that is, the core column adopts an insert-type structure, and the longitudinal reinforcement outside the pipe adopts end-bearing wall bases and column bases.

[0054] The present invention will now be described in detail with reference to preferred embodiments.

[0055] like Figure 1-3 As shown, an embodiment of an insert-end-bearing column base node is provided, including: a steel tube concrete column 10 and a column base foundation 20.

[0056] Taking an independent column base as an example, the steel-concrete composite column 10 first includes a steel core column 11 and an outer reinforced concrete 12. The steel core column 11 serves as the inner core of the steel-concrete composite column 10 to enhance the load-bearing capacity of the entire concrete column. The steel core column 11 extends downward from the bottom surface of the outer reinforced concrete 12 for insertion into the column base 20 during assembly. The steel core column 11 is made of a circular steel tube, and concrete is poured into the circular steel tube to form the core column.

[0057] The outer reinforced concrete 12 is set around the steel pipe. The outer reinforced concrete 12 can be formed into a circle or a square. In this embodiment of the utility model, a square shape is used as an example. Vertical steel bars 121 are arranged around the steel pipe and concrete is poured to form the outer reinforced concrete 12, and the whole is formed into a steel pipe concrete column 10 with an inner circle and an outer square.

[0058] The column base 20 is a concrete column base or a reinforced concrete column base. The column base 20 has a pre-reserved cup opening, and multiple sets of anchor bolts 21 are pre-embedded around the cup opening. The anchor bolts 21 are pre-embedded in the concrete of the column base 20 and extend to the outside for use.

[0059] The steel-concrete composite column 10 of this utility model is further provided with a base plate 13 and a bottom outer steel plate 14. The base plate 13 is located at the bottom of the outer reinforced concrete 12, and is circumferentially fitted around the steel core column 11 on the bottom surface of the outer reinforced concrete 12 and welded and fixed. It extends radially outward from the bottom outer steel plate 14, that is, beyond the range where the bottom outer steel plate 14 is located. The specific planar shape of the base plate 13 is set according to the planar shape of the outer reinforced concrete 12. For square precast components, that is, the outer reinforced concrete 12 has a square cross section, the base plate 13 is a square steel plate, and a circular hole is opened in the center to facilitate fitting around the circular steel tube of the steel core column 11.

[0060] Within a predetermined height range around the bottom of the outer reinforced concrete 12, preferably 100-300mm, a bottom outer steel plate 14 is attached to the four sides of the outer reinforced concrete 12. That is, the bottom outer steel plate 14 wraps around the outer reinforced concrete 12 within this height range from all sides. Several first stiffening ribs 15 are welded to the inside of each side of the bottom outer steel plate 14. Figure 3 As shown, the outer sides of several first stiffening ribs 15 are welded to the bottom outer steel plate 14, and the inner sides are welded to the steel pipe core column 11. Through this arrangement, the bottom outer steel plate 14 and several first stiffening ribs 15 are combined to transform the bottom of the prefabricated component into a steel component, which greatly enhances the integrity of the column base and ensures the end bearing capacity of the insert-end bearing column base node of this utility model.

[0061] like Figure 2In the assembly of this utility model's insert-end-bearing column base node, the steel-concrete composite column 10 rests on the column base foundation 20. The downwardly extending portion of the steel core column 11 is inserted into the socket, and the radially outwardly extending portion of the base plate 13 is anchored and fixed by anchor bolts 21. A grouting material 22 is injected between the bottom of the base plate 13 and the top of the column base foundation 20, as well as into the socket, ensuring that the downwardly extending portion of the steel core column 11 is anchored in the socket and the steel-concrete composite column 10 rests on the top of the column base foundation 20. The base plate 13 transfers the force of the steel-concrete composite column 10 to the top of the column base foundation 20. The anchor bolts transmit the tensile force of the vertical reinforcement of the precast component to the depth of the foundation; the grouting material between the base plate and the foundation transmits the pressure and horizontal shear force of the precast component to the foundation. Thus, the insertion-type end-bearing column assembly is achieved, where the column base joint is composed of an insertion-type part and an end-bearing part. The core column part of the component is inserted into the foundation with a reserved cup opening, while the non-core column part of the component is connected to the foundation through the end-bearing column base. Compared with the traditional exposed column base, the insertion-type end-bearing column base adopts a core column embedded structure, which has excellent seismic performance. Compared with the traditional external column base, the insertion-type end-bearing column base has a relatively simple structure, with only the end-bearing part exposed, occupying less building space and making construction simple and quick. Compared with the traditional embedded column base, the insertion-type end-bearing column base has only the core column embedded, the core column is small in size, does not collide with the foundation reinforcement, and the construction speed is fast.

[0062] In a preferred embodiment, such as Figure 1 As shown, the base plate 13 includes an inner base plate 131, which is located inside the bottom outer steel plate 14. The inner base plate 131 is circumferentially welded between the bottom outer steel plate 14 and the steel tube core column 11. The inner base plate 131 seals the bottom of the outer reinforced concrete 12, providing conditions for concrete pouring without the need for additional formwork. On the other hand, the inner base plate 131, the bottom outer steel plate 14, and the first stiffening rib 15 form a three-dimensional reinforcement measure to ensure the end bearing capacity of the column foot joint. Furthermore, the inner base plate 131 has circumferential through holes for reinforcing bars. The vertical reinforcing bars 121 in the outer reinforced concrete 12 are inserted into the through holes and welded to the inner base plate 131 by through-hole plug welding. In this way, the reinforcing bars are anchored to the base plate, and the internal force of the steel tube concrete column 10 is transferred to the base plate.

[0063] In a preferred embodiment, such as Figure 1 , Figure 3 As shown, the base plate 13 also includes an outer base plate 132. The "outer side" refers to the area outside the bottom outer steel plate 14. The outer base plate 132 is welded to the bottom of the bottom outer steel plate 14 on the same plane as the inner base plate 131, and extends radially outward. Anchor bolt holes are pre-set on the outer base plate 132 for inserting and anchoring anchor bolts 21. For independent column foundations, such as... Figure 3As shown, the outer bottom plate 132 is welded to the bottom perimeter of the outer steel plate 14 and extends outward from the perimeter. Each side of the outer bottom plate 132 has one or more anchor bolt holes pre-set, and the outer bottom plate is directly connected to the anchor bolts. Figure 3 The diagram shows four anchor bolt holes in each group.

[0064] In a preferred embodiment, a plurality of second stiffening ribs 16 are welded to the outer bottom plate 132. The plurality of second stiffening ribs 16 are vertically welded to the outer bottom plate 132 and welded to the outer wall of the bottom outer steel plate 14. Figure 3 The diagram shows a second stiffening rib 16 welded between two adjacent anchor bolt holes, and the second stiffening rib 16 corresponds in position to the first stiffening rib 15. The second stiffening rib 16 enhances the rigidity of the outer base plate 132, allowing the outer base plate to be made thinner, thus saving steel.

[0065] See also Figure 1 In a preferred embodiment, a first ring reinforcement 17 is welded to the portion of the steel pipe core column 11 extending downward from the bottom of the outer reinforced concrete 12. Multiple sets of the first ring reinforcement 17 are evenly distributed along the height. The depth to which the steel pipe core column 11 is embedded in the foundation concrete should not be less than twice the diameter of the steel pipe. By welding the ring reinforcement to the outer wall of the core column within the embedded area of ​​the foundation concrete, the pressure and tension of the core column are transferred to the column base foundation, ensuring the stability of the precast component under normal use.

[0066] See also Figure 1 In a preferred embodiment, a shear sleeve 18 is welded to the periphery of the steel core column 11 at the bottom of the base plate 13, specifically the bottom surface of the inner base plate 131. The shear sleeve 18 fits snugly against the outer wall of the steel core column 11, with its top connected to the inner base plate 131 by a full penetration weld, its bottom connected to the steel core column 11 by a fillet weld, and its middle connected to the steel core column 11 by a plug weld. Under normal circumstances, the column base shear force can be transmitted by the friction between the steel core column 11, the base plate 13, and the concrete; when the horizontal shear force does not meet the design bearing capacity requirements, the shear force is transmitted by the shear sleeve 18 to compensate for the insufficient shear bearing capacity of the column base.

[0067] See also Figure 1-3 In a preferred embodiment, anchor bars 23 are pre-embedded at the bottom of the cup-shaped opening of the column base 20. Multiple sets of anchor bars 23 are evenly distributed around the downwardly extending portion of the steel pipe core column 11, and the tensile bearing capacity of the anchor bars 23 is not lower than the tensile bearing capacity of the steel pipe core column 11. By setting anchor bars at the bottom of the precast cup-shaped opening, when the core column is under tension, the tensile bearing capacity of the anchor bars is not lower than the tensile bearing capacity of the core column, and the anchor bars reliably transfer the tensile force of the core column to the foundation.

[0068] Specifically, the anchor bar 23 is an L-shaped steel bar. The L-shaped bent section is pre-embedded and anchored in the concrete of the column base 20, and the L-shaped vertical section extends out of the cup opening and surrounds the downwardly protruding part of the steel pipe core column 11. After the pipe hole material 22 is poured into the cup opening, the anchor bar 23 and the steel pipe core column 11 are anchored together in the cup opening.

[0069] In another preferred embodiment, see Figure 4-6 Unlike the above embodiments, the difference lies in replacing the anchor bars 23 with non-removable steel pipes 24. Specifically, the non-removable steel pipe 24 is embedded within the cup-shaped outline of the column base 20 as the cup-shaped opening, and the inner and outer walls of the non-removable steel pipe 24 are welded with second ring bars 25. Multiple sets of second ring bars 25 are evenly distributed along the height of the inner and outer walls of the non-removable steel pipe 24. The shear bearing capacity of the second ring bars 25 and the tensile bearing capacity of the non-removable steel pipe 24 are not lower than the ultimate tensile bearing capacity of the steel pipe core column 11. The non-removable steel pipe 24 serves as a non-removable formwork for the cup-shaped foundation pouring and can also transfer the tensile force of the core column to the foundation outside the non-removable steel pipe through the ring bars.

[0070] See also Figure 7 , Figure 8 This illustrates another application example of the insert-end bearing column base node of this utility model, namely, an irregular column, specifically a T-shaped column base foundation. Multiple steel pipe core columns 11 are arranged in a T-shape in the form of steel pipe concrete, combined with the outer outer reinforced concrete 12 to form a T-shaped cross-section steel pipe concrete column 10, which is inserted into the cup-shaped opening of the column base foundation 20 below. Furthermore, both anchor bars 23 and non-removable steel pipes 24 can be used for anchoring in the cup-shaped opening.

[0071] Figure 9 , Figure 10 The image shows another application scenario of the insert-end bearing column foot node of this utility model, used as a wall foot foundation. Specifically, it is applied to a straight steel pipe concrete shear wall to form a wall foot node. Multiple steel pipe core columns 11 are arranged in a straight line in the form of steel pipe concrete, and combined with the outer outer reinforced concrete 12 to form a shear wall, which is inserted into the cup of the wall foot foundation 20 below.

[0072] In summary, this utility model provides an insert-type end-bearing column base joint, and thereby constructs prefabricated steel pipe concrete column base joints and wall base joints. It avoids most of the defects of current steel pipe concrete column base joints, and has the advantages of simple structure, convenient construction, material saving (compared to exposed column bases, the end-bearing part only bears the internal force of the external steel reinforcement, and the number of bolts is greatly reduced), reliable quality, no hidden works, fast construction speed, low requirements for workers, and high load-bearing capacity, high ductility, high stiffness, and excellent seismic performance. It is a cost-effective joint construction method with broad market application prospects.

[0073] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A plug column end- bearing column base node, characterized by, Comprise: A steel tube concrete column, which is composed of a steel tube core column, a peripheral reinforced concrete, a bottom plate and a bottom outer wrapping steel plate, wherein the steel tube core column extends downward from the bottom surface of the peripheral reinforced concrete, the bottom plate is circumferentially welded to the outer periphery of the steel tube core column at the bottom surface of the peripheral reinforced concrete, and the bottom outer wrapping steel plate is wrapped at a predetermined height range of the peripheral bottom of the peripheral reinforced concrete and is welded with a plurality of first stiffening ribs on each side, the plurality of first stiffening ribs are welded with the steel tube core column, and the bottom plate extends radially outward from the bottom outer wrapping steel plate; A column foot foundation, which is reserved with a cup mouth and is embedded with a plurality of groups of anchor bolts around the cup mouth; The steel tube concrete column is located on the column foot foundation, wherein the downward extending part of the steel tube core column is inserted into the cup mouth, the radially outward extending part of the bottom plate is anchored and fixed by the anchor bolts, and the bottom part of the bottom plate and the top part of the column foot foundation are filled with a hole filling material, so that the downward extending part of the steel tube core column is anchored in the cup mouth, and the steel tube concrete column is end supported on the top part of the column foot foundation.

2. The plunger-end-bearing column base node according to claim 1, characterized in that, The bottom plate comprises an inner side bottom plate, which is circumferentially welded between the bottom outer wrapping steel plate and the steel tube core column, and a steel bar through hole is formed circumferentially on the inner side bottom plate, vertical steel bars in the peripheral reinforced concrete are inserted into the steel bar through hole and are welded to the inner side bottom plate by means of a punch plug welding.

3. The plunger-end-bearing column base joint according to claim 2, wherein The bottom plate comprises an outer side bottom plate, which is welded to the peripheral bottom outer wrapping steel plate and extends radially outward, and an anchor bolt hole is provided on the outer side bottom plate.

4. The plunger-end-bearing column base joint according to claim 3, wherein A plurality of second stiffening ribs are welded on the outer side bottom plate, and the plurality of second stiffening ribs are welded with the bottom outer wrapping steel plate.

5. The plunger-end block column base joint of claim 1, wherein, A first ring rib is attached to the downward extending part of the steel tube core column from the bottom of the peripheral reinforced concrete, and a plurality of groups of the first ring rib are uniformly arranged along the height.

6. The plunger-end block column base joint of claim 1, wherein, On the bottom of the bottom plate, a shear resisting sleeve is welded on the periphery of the steel tube core column, the top part of the shear resisting sleeve is connected to the bottom plate by means of a fusion welding seam, the bottom part is connected to the steel tube core column by means of a fillet welding seam, and the middle part is connected to the steel tube core column by means of a plug welding.

7. The top-bracket column base connection of claim 1, wherein An anchor rib is embedded in the bottom part of the cup mouth of the column foot foundation, a plurality of groups of the anchor rib are uniformly arranged on the periphery of the downward extending part of the steel tube core column, and the tensile bearing capacity of the anchor rib is not less than the tensile bearing capacity of the steel tube core column.

8. The plunger-end block column base joint according to claim 7, wherein The anchor rib is an L-shaped rib, the L-shaped bending section is embedded and anchored in the concrete of the column foot foundation, and the L-shaped vertical section extends out of the cup mouth and surrounds the periphery of the downward extending part of the steel tube core column.

9. The plunger end block type column base joint according to claim 1, wherein A removable steel tube is inlaid in the outline of the cup mouth of the column foot foundation as the cup mouth, and a second ring rib is attached to the inner wall and the outer wall of the removable steel tube, a plurality of groups of the second ring rib are uniformly arranged along the height on the inner wall and the outer wall of the removable steel tube, and the shear bearing capacity of the second ring rib and the tensile bearing capacity of the removable steel tube are not less than the tensile ultimate bearing capacity of the steel tube core column.

10. The top-bracket column base joint according to any one of claims 1-9, wherein The column end bearing type column foot joint comprises the following forms: An independent column foot joint, one steel tube concrete column is inserted into the cup mouth of the column foot foundation; A special-shaped column foot joint, a plurality of steel tube core columns are arranged in a special-shaped section in the form of a steel tube concrete row and form a special-shaped steel tube concrete column with the peripheral reinforced concrete, and are inserted into the cup mouth of the column foot foundation; Shear wall base joint, multiple steel pipe core columns are arranged in a straight type section with row of steel pipe concrete, and form shear wall with outer peripheral reinforced concrete, inserted into cup opening of wall base foundation.

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