Inserting column end bearing type column base joint

Abstract

The invention relates to an inserting column end-bearing type column base joint which comprises a steel reinforced concrete column, a steel reinforced concrete column, a bottom plate and a bottom wrapping steel plate, the steel reinforced concrete column is composed of a steel core column, peripheral reinforced concrete, the bottom plate and the bottom wrapping steel plate, and the steel core column extends downwards from the bottom face of the peripheral reinforced concrete; the bottom plate is annularly welded to the periphery of the profile steel 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, the first stiffening ribs are connected with the profile steel core column in a welded mode, and the second stiffening ribs are connected with the profile steel core column in a welded mode. The bottom plate extends outwards in the radial direction from the bottom wrapping steel plate; 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 steel reinforced concrete column is supported at the top of the column foot foundation, the structure is simple, the quality is reliable, the anti-seismic property is excellent, the construction speed is high, and the node structure construction method is high in cost performance.

Description

Technical Field

[0001] The invention relates to the technical field of building structures, in particular to an assembled structure, and specifically to an inserted column end-bearing column foot node. Background Art

[0002] The column foot is an important node connecting the upper main structure and the foundation in the steel structure. It is the main factor that determines its stable bearing capacity and plays an important role in the structure. It can effectively fix the column body and transfer the axial force, bending moment and shear force at the lower end of the column to the foundation, so that the upper structure and the foundation are effectively connected together.

[0003] Prefabricated buildings are divided into prefabricated concrete structures and prefabricated steel structures. Prefabricated concrete structures usually use cast-in-place structures in the underground part, with the foundation and column base cast as a whole or using inserted column bases. The integrally cast column base has high rigidity and good integrity, but requires a large amount of on-site construction and a long construction period, which does not conform to the development concept of prefabricated buildings. The inserted column base has low rigidity and poor integrity. It is difficult to design column bases with large internal forces at the bottom of the column and it is difficult to meet the requirements. At the same time, temporary fixing measures are required during construction to ensure the stability of the column, and positioning and leveling are difficult.

[0004] There are three main types of prefabricated steel structure column base nodes: exposed, external, and embedded. Fig.11 As shown, the exposed column foot is mainly composed 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 requirements of the drawings using the anchor bolt support brackets, and then the foundation concrete is poured. After the foundation concrete hardens, the upper steel pipe column is installed. After alignment, leveling and fixing, the grouting material is poured for the second time. The externally wrapped column foot is formed by wrapping the column foot with reinforced concrete. Generally, the side length of the column foot section is 400-600mm larger than the diameter of the round steel pipe. The externally wrapped column foot has more steel bars tied on site, and the additional steel bars at the column foot are staggered with the foundation steel bars. The construction steps are cumbersome and the construction period is long. The embedded column foot is to first fix the steel pipe column in the reinforced concrete foundation or foundation beam as required, and then pour the mud concrete to bury the column foot directly in the reinforced concrete foundation or foundation beam.

[0005] In comparison, the exposed column base is relatively simple in structure, but has a small application range. It is generally suitable for single-story factories or multi-story buildings in low-intensity areas. When the internal force of the column base is small, the bending moment and tension of the column base are all borne by the column base anchor bolts. The anchor bolts do not bear shear force, and the shear force is borne by the friction between the contact surface of the column base and the foundation or shear keys are set. The stiffness and bearing capacity of the exposed column base are lower than other forms of column bases, and the seismic performance is poor; the structure of the externally packaged column base is relatively complex, the side length of the column base section is 400-600mm larger than the diameter of the round steel pipe and is completely exposed, occupying more building space, which is not popular with architects and is generally less used. It is generally used in parking lots, warehouses and factories to prevent vehicles from This form is used when there is a collision. At the same time, the construction of steel bars is affected by bolts, steel bars in the foundation, etc., which is cumbersome, slow in construction speed, and long in construction period. It is not suitable when the internal force of the column foot is large. When the internal force is large, the column foot size is larger, and it occupies more building space, which is more difficult for architects to accept. The embedded column foot inserts the round steel pipe column into the foundation. The column bottom has a punching effect on the foundation bottom plate. The foundation bottom plate is thick and the cost is high. The round steel pipe column collides with the foundation steel bar. It is necessary to open a hole in the side wall of the round steel pipe column to ensure that the foundation steel bar passes through. The construction speed is slow and the construction period is long. It is often used in high-rise buildings or when the internal force at the bottom of the column is large. The embedded column foot has high rigidity, high bearing capacity, and good seismic performance. However, the embedded column foot has a complex structure. The steel column needs to be inserted into the foundation. The embedding depth is large. In addition, the height required for the foundation punching calculation generally requires a large foundation thickness and a high foundation cost. At the same time, the steel column conflicts with the steel bars in the foundation. When the cross-sectional size of the steel column is large, the embedded foundation part needs to open a hole to allow the foundation steel bar to pass through, which is inconvenient for construction.

[0006] In addition, the construction of the three types of column footings requires temporary support and other fixing measures, which makes positioning and leveling inconvenient. Therefore, it is of great significance to study a wall footing and column footing node suitable for assembled steel tube concrete structures. Summary of the invention

[0007] In view of the deficiencies in the prior art, the present invention proposes a column foot node with an inserted column end bearing, which can achieve an inserted column end bearing connection at the node to solve the defects of the existing column foot and wall foot nodes.

[0008] The technical solution of the present invention is as follows:

[0009] A column end bearing type column foot node, comprising:

[0010] A steel-concrete column, comprising a steel core column, outer reinforced concrete, a bottom plate and a bottom outer steel plate, wherein the steel core column extends downward from the bottom surface of the outer reinforced concrete, the bottom plate is circumferentially welded to the periphery of the steel core column on the bottom surface of the outer reinforced concrete, the bottom outer steel plate is wrapped around the bottom periphery of the outer reinforced concrete at a certain height, and a plurality of first stiffening ribs are welded on each side, the plurality of first stiffening ribs are welded to the steel core column, and the bottom plate extends radially outward from the bottom outer steel plate;

[0011] The column foot foundation has a reserved cup mouth, and multiple groups of anchor bolts are embedded around the cup mouth;

[0012] During assembly, the steel-concrete column is placed on the column base, with the downwardly protruding part of the steel core column inserted into the cup mouth, the radially outwardly protruding part of the base plate being anchored and fixed by anchor bolts, and the hole-filling material is poured between the bottom of the base plate and the top of the column base and in the cup mouth, so that the downwardly protruding part of the steel core column is anchored in the cup mouth, and the end of the steel-concrete column is supported on the top of the column base.

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

[0014] Preferably, the bottom plate comprises an outer bottom plate, the outer bottom plate is welded to the periphery of the bottom outer steel plate and extends radially outward, and the outer bottom plate is pre-set with anchor holes.

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

[0016] Preferably, the portion of the steel core column extending downward from the bottom of the outer reinforced concrete is welded with first annular reinforcements, and the first annular reinforcements are evenly arranged in multiple groups along the height.

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

[0018] Preferably, anchor bars are pre-embedded at the bottom of the cup mouth of the column foot foundation, and multiple groups of anchor bars are evenly arranged around the periphery of the downwardly extending portion of the steel core column, and the tensile bearing capacity of the anchor bars is not lower than that of the steel core column.

[0019] Preferably, the anchor bar is an L-shaped steel bar, the L-shaped bent section is pre-embedded and anchored in the concrete of the column foot foundation, and the L-shaped vertical section extends out of the cup mouth and encloses the outer periphery of the downwardly extending portion of the steel core column.

[0020] Preferably, a non-disassembly steel pipe is embedded in the cup-shaped contour of the column base as the cup-shaped portion, and second ring reinforcements are welded to the inner and outer walls of the non-disassembly steel pipe, and multiple groups of the second ring reinforcements are evenly arranged along the height of the inner and outer walls of the non-disassembly steel pipe, and the shear bearing capacity of the second ring reinforcement and the tensile bearing capacity of the non-disassembly steel pipe are not lower than the ultimate tensile bearing capacity of the steel core column.

[0021] Preferably, the column end bearing type column foot node includes the following forms:

[0022] Independent column foot node, a steel concrete column is inserted into the cup of the column foot foundation;

[0023] Special-shaped column foot node, multiple steel core columns are arranged into special-shaped cross-sections, and together with the outer reinforced concrete form special-shaped steel concrete columns, which are inserted into the cup mouth of the column foot foundation;

[0024] At the foot node of the shear wall, multiple steel core columns are arranged into a straight-line cross-section and form a shear wall with the outer reinforced concrete, which is inserted into the cup mouth of the foot foundation.

[0025] The beneficial effects of the present invention over the prior art are as follows: the present invention proposes an inserted column end-bearing column foot node, which is composed of an inserted column part and an end-bearing part, wherein 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 foot, which has the following advantages:

[0026] The new type of node combines the advantages of the exposed and embedded types, avoiding the disadvantages of both. The node construction is the same as the exposed wall footing and column footing. The anchor bolts can be used as construction measures and normal use structures at the same time, which is economical and reasonable, and the construction is simple; the foundation and its corresponding floor position can be constructed in advance, without waiting for the prefabricated wall columns to arrive, which is friendly to the construction site (the embedded and outsourced wall footing and column foot nodes require the construction of prefabricated wall columns first, and then pour the foundation and the concrete of the floor position corresponding to the foundation, which takes a long time and the wall column construction site is chaotic).

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

[0028] The round steel pipe is inserted inside and the concrete end is supported outside the pipe. The size of the reserved cup mouth is small, which has no conflict with the foundation steel bars and has no impact on the construction of the foundation and foundation beams. The construction speed is fast and the construction period is saved. The structure is simple and the steel pipes do not need to be disassembled. They are all completed in the factory with a high degree of industrialization, which meets the requirements of prefabricated buildings. Compared with the embedded foundation, the thickness of the foundation section is greatly reduced, reducing the cost of foundation construction.

[0029] It should be understood that the implementation of any embodiment of the present invention does not mean that multiple or all of the above-mentioned beneficial effects must be possessed or achieved at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0031] The structures, proportions, sizes, etc. illustrated in this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with the technology. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantial technical significance. Any structural modification, change in proportion or adjustment in size shall still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0032] Figure 1 This is a schematic diagram of the column foot node of the first embodiment of the present invention before assembly;

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

[0034] Figure 3 This is a schematic plan view of a column foot node with an inserted column end support according to the first embodiment of the present invention;

[0035] Figure 4 This is a schematic diagram of a column foot node of an inserted column end-bearing type before assembly according to a second embodiment of the present invention;

[0036] Figure 5 This is a schematic diagram of the assembled column foot node of the second embodiment of the present invention;

[0037] Figure 6 It is a schematic plan view of a column foot node of an inserted column end-bearing type according to a second embodiment of the present invention;

[0038] Figure 7 This is a schematic plan view of a column foot node with an inserted column end support according to a third embodiment of the present invention;

[0039] Figure 8 It is a schematic plan view of a column foot node of an inserted column end-bearing type according to a fourth embodiment of the present invention;

[0040] Fig. 9 It is a schematic plan view of a column foot node of an inserted column end-bearing type according to a fifth embodiment of the present invention;

[0041] Fig.10 It is a schematic plan view of a column foot node of an inserted column end-bearing type according to a sixth embodiment of the present invention;

[0042] Fig.11Schematic diagram of the existing column base node structure, where (a) is exposed, (b) is external, and (c) is embedded.

[0043] Markings in the figure:

[0044] Steel concrete column 10, column footing 20;

[0045] Steel core column 11, outer reinforced concrete 12, vertical steel bar 121, bottom plate 13, inner bottom plate 131, outer bottom plate 132, bottom outer steel plate 14, first stiffening rib 15, second stiffening rib 16, first annular reinforcement 17, shear sleeve 18;

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

[0047] The same or corresponding symbols in the drawings indicate the same or corresponding parts. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical solution and advantages of the embodiments of the present invention more clearly understood, the embodiments of the present invention are further described in detail below in conjunction with the embodiments and drawings. Here, the illustrative embodiments of the present invention and their description are used to explain the present invention, but are not intended to limit the present invention.

[0049] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0050] It should be understood that the terms "include / comprise", "consist of..." or any other variations are intended to cover non-exclusive inclusion, so that a product, device, process or method that includes a series of elements includes not only those elements, but also may include other elements not explicitly listed when necessary, or also includes elements inherent to such product, device, process or method. In the absence of more restrictions, the elements defined by the sentence "include / comprise...", "consist of..." do not exclude the presence of other identical elements in the product, device, process or method that includes the elements.

[0051] It is also necessary to understand that terms such as "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside" and "outside" to indicate directions or positional relationships are based on the directions 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 referred device, component or structure must have a specific direction, be constructed or operate in a specific direction, and should not be understood as a limitation on the present invention.

[0052] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0053] In view of the lessons learned that non-embedded column bases, especially those above the ground, are easily damaged in earthquakes, it is advisable to use inserted column end-bearing wall and column bases for prefabricated steel tube concrete wall columns. That is, the core column adopts an inserted structure, and the longitudinal reinforcement outside the tube adopts end-bearing wall and column bases.

[0054] The implementation of the present invention is described in detail below in conjunction with preferred embodiments.

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

[0056] First, an independent column foot foundation is taken as an example, wherein the steel concrete column 10 first includes a steel core column 11 and a peripheral reinforced concrete 12. The steel core column 11 serves as the inner core of the steel concrete column 10 to enhance the bearing capacity of the entire concrete column, and the steel core column 11 continues to extend downward from the bottom surface of the peripheral reinforced concrete 12 for a certain length so as to be inserted into the column foot foundation 20 during assembly. The steel core column 11 is mostly a steel tube concrete core column, preferably a round steel tube and concrete is poured into the tube.

[0057] The outer reinforced concrete 12 is arranged on the outer periphery of the steel pipe. The outer reinforced concrete 12 can be formed into a circle or a square. The embodiment of the present invention takes the square as an example. The outer reinforced concrete 12 is formed by arranging vertical steel bars 121 on the outer periphery of the steel pipe and pouring concrete, and the overall structure is a steel 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 is provided with a cup-shaped opening, and a plurality of anchor bolts 21 are embedded in the concrete of the column base 20 and extend to the outside for use.

[0059] The steel-concrete column 10 of the present invention is also provided with a bottom plate 13 and a bottom outer steel plate 14. The bottom plate 13 is arranged at the bottom of the outer reinforced concrete 12, and is circumferentially sleeved on the outer periphery of the steel core column 11 on the bottom surface of the outer reinforced concrete 12 and fixed by welding, and radially extends outward from the bottom outer steel plate 14, that is, exceeds the range where the bottom outer steel plate 14 is located. The specific plane shape of the bottom plate 13 is set according to the plane shape of the outer reinforced concrete 12. For a square prefabricated component, that is, the outer reinforced concrete 12 is a square cross-section, the bottom plate 13 is a square steel plate, and a circular hole is opened in the center to facilitate sleeved on the outer periphery of the circular steel pipe of the steel core column 11.

[0060] In a certain height range around the bottom of the outer reinforced concrete 12, preferably 100-300mm, the outer surface of the outer reinforced concrete 12 is attached with the bottom outer steel plate 14, that is, the bottom outer steel plate 14 wraps the height range of the outer reinforced concrete 12 from all sides, and a plurality of first stiffening ribs 15 are welded inside each side of the bottom outer steel plate 14, such as Figure 3 As shown, the outer sides of the plurality of first stiffening ribs 15 are welded to the bottom outer steel plate 14, and the inner sides are welded to the steel core column 11. Through such an arrangement, the bottom outer steel plate 14 is combined with the plurality of first stiffening ribs 15, and the bottom of the prefabricated component is turned into a steel component, which greatly enhances the integrity of the column foot and ensures the end bearing capacity of the plug-in column end-bearing column foot node of the present invention.

[0061] like Figure 2 When assembling the plug-in column end-bearing column foot node of the present invention, the steel concrete column 10 is seated on the column foot foundation 20, wherein the downwardly protruding portion of the steel core column 11 is inserted into the cup mouth, the radially outwardly protruding portion of the bottom plate 13 is anchored and fixed by the anchor bolt 21, and the hole-filling material 22 is poured between the bottom of the bottom plate 13 and the top of the column foot foundation 20 and in the cup mouth, so that the downwardly protruding portion of the steel core column 11 is anchored in the cup mouth, and the steel concrete column 10 is end-bearing on the top of the column foot foundation 20, and the bottom plate 13 is used to convert the force of the steel concrete column 10 to the top of the column foot foundation 20. The anchor bolt transfers the tension of the vertical steel bars of the prefabricated component to the deep foundation; the hole-filling material between the bottom plate and the foundation transfers the pressure and horizontal shear force of the prefabricated component to the foundation. In this way, the inserted column end-bearing assembly is realized, that is, the column base node is composed of an inserted column part and an end-bearing part, wherein the core column part of the component is inserted down into the reserved cup-shaped foundation, and 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 inserted column end-bearing column base adopts an embedded core column structure with excellent seismic performance; compared with the traditional outsourced column base, the inserted column end-bearing column base has a relatively simple structure, with only the end-bearing part exposed, occupying less building space, and simple and quick construction; compared with the traditional embedded column base, the inserted column end-bearing column base only has the core column embedded, the core column is small in size, there is no collision with the foundation steel bars, and the construction speed is fast.

[0062] In a preferred embodiment, if Figure 1 As shown, the bottom plate 13 includes an inner bottom plate 131. The so-called inner side is arranged inside the bottom outer steel plate 14. The inner bottom plate 131 is circumferentially welded between the bottom outer steel plate 14 and the steel core column 11. With the help of the inner bottom plate 131, on the one hand, the bottom of the outer reinforced concrete 12 is closed to provide conditions for pouring concrete without additional formwork. On the other hand, the inner bottom 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 inserted column end-bearing column foot node. Furthermore, steel bar through holes are circumferentially opened on the inner bottom plate 131. The vertical steel bars 121 in the outer reinforced concrete 12 are correspondingly inserted into the steel bar through holes and welded to the inner bottom plate 131 by piercing plug welding. In this way, the steel bars are anchored to the bottom plate, and the internal force of the steel bars of the steel concrete column 10 is transmitted to the bottom plate.

[0063] In a preferred embodiment, if Figure 1 , Figure 3 As shown, the bottom plate 13 also includes an outer bottom plate 132, which is arranged outside the bottom outer steel plate 14. The outer bottom plate 132 is welded to the bottom of the bottom outer steel plate 14 on the same plane as the inner bottom plate 131 at the periphery of the bottom outer steel plate 14 and extends radially outward. Anchor holes are preset on the outer bottom plate 132 for inserting and anchoring the anchor bolts 21. For an independent column foundation, such as Figure 3 As shown, the outer bottom plate 132 is welded to the bottom periphery of the bottom outer steel plate 14 and extends outward from the periphery. One or more anchor bolt holes are preset on the outer bottom plate 132 on each side, and the outer bottom plate is directly connected to the anchor bolt. Figure 3 Each group of four anchor bolt holes is shown.

[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 are welded to the outer wall of the bottom outer steel plate 14 . Figure 3 It is shown that a second stiffening rib 16 is welded between two adjacent anchor holes of the four anchor holes, and the second stiffening rib 16 corresponds to the position of the first stiffening rib 15. The second stiffening rib 16 enhances the rigidity of the outer bottom plate 132, and the thickness of the outer bottom plate can be made thinner, saving steel consumption.

[0065] Continue to see Figure 1 In a preferred embodiment, the steel core column 11 extends downward from the bottom of the outer reinforced concrete 12 and is welded with a first ring rib 17, and multiple groups of the first ring rib 17 are evenly arranged along the height. The depth of the steel core column 11 buried in the foundation concrete should not be less than 2 times the diameter of the steel pipe, and the core column pressure and tension are transmitted to the column foot foundation by welding the ring ribs on the outer wall of the core column within the range of the buried foundation concrete, ensuring the stability of the prefabricated component under normal use.

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

[0067] See also Figure 1-3 In a preferred embodiment, anchor bars 23 are pre-buried at the bottom of the cup mouth of the column foot foundation 20. Multiple groups of anchor bars 23 are evenly arranged around the outer periphery of the downwardly extending portion of the steel core column 11, and the tensile bearing capacity of the anchor bars 23 is not less than the tensile bearing capacity of the steel core column 11. By arranging anchor bars at the bottom of the prefabricated cup mouth, when the core column is under tension, the tensile bearing capacity of the anchor bars is not less than the tensile bearing capacity of the core column, and the anchor bars reliably transmit 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 bending section is pre-embedded and anchored in the concrete of the column foot foundation 20, and the L-shaped vertical section extends out of the cup mouth and surrounds the outer periphery of the downwardly extending portion of the steel core column 11. After the pipe hole material 22 is poured into the cup mouth, the anchor bar 23 and the steel core column 11 are anchored in the cup mouth together.

[0069] In another preferred embodiment, see Figure 4-6 , which is different from the above-mentioned embodiment, is that the anchor bar 23 is replaced by a non-disassembly steel pipe 24. Specifically, the non-disassembly steel pipe 24 is embedded in the cup-mouth contour of the column foot foundation 20 as the cup-mouth, and the inner and outer walls of the non-disassembly steel pipe 24 are welded with second annular bars 25. Multiple groups of second annular bars 25 are evenly arranged along the height of the inner and outer walls of the non-disassembly steel pipe 24. The shear bearing capacity of the second annular bars 25 and the tensile bearing capacity of the non-disassembly steel pipe 24 are not lower than the ultimate tensile bearing capacity of the steel core column 11. The non-disassembly steel pipe 24, on the one hand, serves as a non-disassembly template for pouring the cup-mouth foundation, and on the other hand, can transmit the core column tension to the foundation outside the non-disassembly steel pipe through the annular bars.

[0070] Continue to see Figure 7 , Figure 8 , shows another application example of the plug-in column end-bearing column foot node of the present invention, namely, a special-shaped column, specifically a T-shaped column foot foundation, where multiple steel core columns 11 are arranged in a T shape, combined with the external peripheral reinforced concrete 12 to form a steel concrete column 10 with a T-shaped cross section, which is correspondingly inserted into the cup mouth of the column foot foundation 20 below. In addition, two anchoring measures, anchor bars 23 and non-disassembly steel pipes 24, can also be used in the cup mouth.

[0071] Fig. 9 , Fig.10 In the figure, another application scenario of the inserted column end-bearing column base node of the present invention is shown, which is used as a wall base foundation, specifically applied to a straight-line steel tube concrete shear wall to form a wall base node. Multiple steel core columns 11 are arranged in a straight line, combined with the external outer reinforced concrete 12 to form a shear wall, which is correspondingly inserted into the cup mouth of the wall base foundation 20 below.

[0072] In summary, the present invention provides a column end-bearing column base node, and thereby obtains an assembled row steel-concrete column base node and a wall base node, which avoids most of the defects of the current steel-concrete column base nodes, has simple structure, convenient construction, and material saving (relative to the exposed column base, the end-bearing part only bears the internal force of the steel bars outside the tube, and the number of bolts will be greatly reduced), reliable quality, no hidden works, fast construction speed, and low requirements for workers. At the same time, it has high bearing capacity, high ductility, high rigidity, and excellent seismic performance. It is a cost-effective node construction method with broad market application prospects.

[0073] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A column end bearing type column foot node, characterized in that: include: A steel-concrete column, comprising a steel core column, outer reinforced concrete, a bottom plate and a bottom outer steel plate, wherein the steel core column is inserted into the center of the outer reinforced concrete and extends downward from the bottom surface of the outer reinforced concrete, the bottom plate is circumferentially welded to the periphery of the steel core column on the bottom surface of the outer reinforced concrete, the bottom outer steel plate is wrapped around the bottom periphery of the outer reinforced concrete at a certain height, and a plurality of first stiffening ribs are welded on each side, the plurality of first stiffening ribs are welded to the steel core column, and the bottom plate extends radially outward from the bottom outer steel plate; The column foot foundation has a reserved cup mouth, and multiple groups of anchor bolts are embedded around the cup mouth; During assembly, the steel-concrete column is placed on the column base, with the downwardly protruding part of the steel core column inserted into the cup mouth, the radially outwardly protruding part of the base plate being anchored and fixed by anchor bolts, and the hole-filling material is poured between the bottom of the base plate and the top of the column base and in the cup mouth, so that the downwardly protruding part of the steel core column is anchored in the cup mouth, and the end of the steel-concrete column is supported on the top of the column base.

2. The column end-bearing column foot node according to claim 1, characterized in that: The bottom plate includes an inner bottom plate, which is circumferentially welded between the bottom outer steel plate and the steel core column, and a steel bar through hole is circumferentially opened on the inner bottom plate. The vertical steel bars in the outer reinforced concrete are correspondingly inserted into the steel bar through holes and welded to the inner bottom plate by plug welding.

3. The column end-bearing column foot node according to claim 2, characterized in that: The bottom plate comprises an outer bottom plate, the outer bottom plate is welded to the periphery of the bottom outer steel plate and extends radially outward, and anchor holes are preset on the outer bottom plate.

4. The column end-bearing column foot node according to claim 3, characterized in that: A plurality of second stiffening ribs are welded on the outer bottom plate, and the plurality of second stiffening ribs are welded to the bottom outer steel plate.

5. The column end-bearing column foot node according to claim 1, characterized in that: The portion of the steel core column that extends downward from the bottom of the outer reinforced concrete is welded with a first ring rib, and the first ring rib is evenly arranged in multiple groups along the height.

6. The column end-bearing column foot node according to claim 1, characterized in that: At the bottom of the base plate, a shear sleeve is welded to the periphery of the steel core column. The top of the shear sleeve is connected to the base plate by a full penetration weld, the bottom is connected to the steel core column by a fillet weld, and the middle is connected to the steel core column by a plug weld.

7. The column end-bearing column foot node according to claim 1, characterized in that: Anchor bars are pre-buried at the bottom of the cup mouth of the column foot foundation. The anchor bars are evenly arranged in multiple groups around the downwardly extending part of the steel core column, and the tensile bearing capacity of the anchor bars is not lower than that of the steel core column.

8. The column end-bearing column foot node according to claim 7, characterized in that: The anchor bar is an L-shaped steel bar, the L-shaped bent section is pre-embedded and anchored in the concrete of the column foot foundation, and the L-shaped vertical section extends out of the cup mouth and encloses the outer periphery of the downwardly extending part of the steel core column.

9. The column end-bearing column foot node according to claim 1, characterized in that: A non-disassembly steel pipe is embedded in the cup-shaped contour of the column base as the cup-shaped portion, and second ring reinforcements are welded to the inner and outer walls of the non-disassembly steel pipe. Multiple groups of the second ring reinforcements are evenly arranged along the height of the inner and outer walls of the non-disassembly steel pipe. The shear bearing capacity of the second ring reinforcements and the tensile bearing capacity of the non-disassembly steel pipe are not lower than the ultimate tensile bearing capacity of the steel core column.

10. The column end-bearing column foot node according to any one of claims 1 to 9, characterized in that: The plug-in column end-bearing column base node includes the following forms: Independent column foot node, a steel concrete column is inserted into the cup of the column foot foundation; Special-shaped column foot node, multiple steel core columns are arranged into special-shaped cross-sections, and together with the outer reinforced concrete form special-shaped steel concrete columns, which are inserted into the cup mouth of the column foot foundation; At the foot node of the shear wall, multiple steel core columns are arranged into a straight-line cross-section and form a shear wall with the outer reinforced concrete, which is inserted into the cup mouth of the foot foundation.

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