Steel tube concrete column-composite beam connection node structure and construction method

Abstract

The present application relates to the technical field of prefabricated buildings, and in particular to a steel tube concrete column-composite beam connection node structure and construction method, wherein the node structure comprises a concrete composite beam and a steel tube concrete column; the steel tube concrete column comprises a steel tube, a node domain steel cage is arranged in the middle of the steel tube, the end of the steel cage in the beam is inserted into the node domain steel cage, the through steel bar passes through the steel cage in the beam and the node domain steel cage, and the upper part of the steel cage in the beam is a cast-in-place strip; a partition is arranged in the cast-in-place strip, UHPC is cast in the node casting area, and ordinary concrete is cast in the ordinary casting area, which shortens the anchorage length of the steel bars of the prefabricated component, avoids the use of a ring beam in a traditional steel tube concrete column-concrete beam connection node, simplifies the node structure, reduces the collision of steel bars in the node area, significantly improves the performance of the connection node, and effectively solves the problems of poor stiffness, poor integrity, easy cracking, complex structure, and cumbersome and difficult construction of the connection node.

Description

Technical Field

[0001] The present application relates to the technical field of prefabricated buildings, and in particular to a steel tube concrete column-composite beam connection node structure and construction method. Background Art

[0002] The connection between steel tube concrete column and reinforced concrete beam is a node method of steel tube concrete column and reinforced concrete beam, which makes the connection of steel tube in the node area safer and more reliable, and the concrete beam can transmit internal force well. Steel tube concrete structure is a new type of composite structure formed by filling concrete into steel tube, which overcomes the disadvantage of steel tube structure prone to local buckling, greatly improves the strength and elongation of concrete, and provides bearing capacity and deformation capacity.

[0003] In the prior art, a connection structure of a steel tube concrete column and a reinforced concrete beam includes a steel tube concrete column, a primary frame beam, a steel liner, a shear ring, a tension structure, a ring beam, and a secondary frame beam. A circle of steel liner is welded on the outer wall of the steel tube concrete column, a plurality of through holes are also opened on the steel liner, and a plurality of groups of shear rings are welded on the outer wall of the steel liner. A tension structure is provided at the end where the primary frame beam is connected to the steel tube concrete column, and one end of the tension structure is also connected to the steel liner. The ring beam is wound around the outer circle of the steel liner, and the steel cage in the ring beam passes through the primary frame beam, and the secondary frame beam is connected to the ring beam. The connection structure does not need to drill holes on the steel tube concrete column, will not damage the compressive bearing capacity and bending and torsion resistance of the original structural column, will not damage the quality and safety of the original structure, and the connection structure is safe and stable, ensuring the construction quality and structural safety.

[0004] There are many application cases of steel-concrete composite structures using steel tube concrete columns and reinforced concrete beams and slabs, but the beam-column node connection problem has always been a pain point in the application of this structural form, especially in the steel tube concrete column-concrete beam connection node where the steel tube is disconnected. There are generally problems such as protruding ring beams occupying the internal space of the building, low assembly rate, poor stiffness, poor integrity, easy cracking, complex structure and cumbersome construction. Summary of the invention

[0005] In order to solve the above problems, the present application provides a steel tube concrete column-composite beam connection node structure and construction method.

[0006] The present application provides a steel tube concrete column-composite beam connection node structure and construction method using the following technical solutions: On the one hand, a steel tube concrete column-composite beam connection node structure includes a concrete composite beam and a steel tube concrete column; the concrete composite beam includes a precast beam, a through steel bar and a cast-in-place concrete layer, the precast beam includes a beam inner steel cage and a precast concrete layer wrapping the lower part of the beam inner steel cage; the steel tube concrete column includes a steel pipe, a node domain steel cage is provided in the middle of the steel pipe, the column dowel of the node domain steel cage extends to the upper and lower parts of the steel pipe, the end of the beam inner steel cage is inserted into the node domain steel cage, the through steel bar runs through the beam inner steel cage and the node domain steel cage, and the upper part of the beam inner steel cage is a cast-in-place belt; A partition is provided in the cast-in-place belt, which divides the cast-in-place belt into a node casting area connected to the middle part of the steel pipe and a common casting area away from the steel pipe. The node casting area is cast with UHPC, and the common casting area is cast with common concrete to form a cast-in-place concrete layer; the upper and lower parts of the steel pipe are both cast with common concrete.

[0007] By adopting the above technical solution, a combination of precast beams and steel tube concrete columns is used, and partitions are set in the cast-in-place belt to distinguish the casting areas of UHPC and ordinary concrete, and mixed oriented fiber UHPC is cast in the node casting area, the anchorage length of the steel bars of the precast components is shortened, the use of ring beams in the traditional steel tube concrete column-concrete beam connection node is avoided, the node structure is simplified, the collision of steel bars in the node area is reduced, the performance of the connection node is significantly improved, and the problems of poor stiffness of the connection node, poor integrity, easy cracking, complex structure, and cumbersome and difficult construction are effectively solved.

[0008] Optionally, the steel pipe includes an upper steel pipe, a lower steel pipe and a non-disassembly formwork; the non-disassembly formwork is arranged around the node domain steel cage, the upper end of the non-disassembly formwork is abutted against the upper steel pipe, and the lower end is abutted against the lower steel pipe, thereby enclosing a casting space with the prefabricated beam.

[0009] By adopting the above technical solution, the non-disassembly formwork connects the upper steel pipe and the lower steel pipe on the one hand, and encloses the casting area with the prefabricated beam on the other hand, avoiding the support of the formwork during the cast-in-place UHPC in the node area, reducing the construction process, and improving the construction efficiency. It is suitable for prefabricated steel tube concrete frame structure.

[0010] Optionally, shear studs are provided in both the upper steel pipe and the lower steel pipe, and two stirrups at the end portions of the node domain reinforcement cage are both against the corresponding shear studs.

[0011] By adopting the above technical solution, the force is transmitted through the column dowel bars of the node domain steel cage, the concrete in the column and the shear studs, which improves the overall shear bearing capacity and shear stiffness of the structure and enhances the stability and safety of the structure.

[0012] Optionally, the non-removal formwork is an "L"-shaped UHPC board made of steel fibers and slender organic fibers.

[0013] By adopting the above technical solution, it can be ensured that there is no "mold expansion" phenomenon during the concrete pouring process. The use of slender organic fibers can make the non-removal formwork achieve the effect of "cracking but not breaking" during earthquakes.

[0014] Optionally, an upper hole and a lower hole are opened in the middle of the steel pipe, the longitudinal reinforcement of the steel cage in the beam passes through the lower hole and is fixedly connected to the steel pipe, and the through steel bar passes through the upper hole; ordinary concrete in the lower part of the steel pipe is cast through the lower hole, and UHPC in the middle of the steel pipe is cast through the upper hole.

[0015] By adopting the above technical solution, the construction process of the steel pipe is simplified, the strength of the steel pipe is enhanced, and the quality and safety of the structure are improved.

[0016] Optionally, a steel bar positioning device is provided in the steel pipe, located below the lower hole, for positioning the node domain steel bar cage.

[0017] By adopting the above technical solution, displacement of the steel cage during concrete pouring can be avoided, thereby ensuring the stability and safety of the structure.

[0018] Optionally, the precast concrete layer is provided with a groove at one end close to the steel pipe for UHPC to be embedded.

[0019] By adopting the above technical solution, the connection strength between the precast concrete layer and the cast-in-place concrete layer is enhanced, thereby improving the quality and safety of the structure.

[0020] In a second aspect, a construction method of a steel tube concrete column-composite beam connection node structure comprises the following steps: A. Provide a steel pipe and a node domain steel cage, fix the node domain steel cage to the middle of the steel pipe, extend the column dowels of the node domain steel cage to the lower part of the steel pipe, and pour ordinary concrete to the lower part of the steel pipe; B. Providing a precast beam, wherein the precast beam comprises an inner reinforcement cage and a precast concrete layer wrapping the lower part of the inner reinforcement cage; setting up a temporary support, and inserting the longitudinal reinforcement of the inner reinforcement cage into the node domain reinforcement cage; C. Provide through steel bars, which are arranged on the top of the steel cage in the beam and pass through the steel cage in the node area; D. The upper part of the steel cage in the beam is a cast-in-place belt. The upper cast-in-place belt is supported by formwork, and a separator is set in the cast-in-place belt to separate the cast-in-place belt into a node casting area connected to the middle of the steel pipe and a common casting area away from the steel pipe; E. First pour UHPC into the node pouring area, then pour ordinary concrete into the ordinary pouring area, and perform curing after sufficient vibration to form a cast-in-place concrete layer. The lower precast beam and the upper cast-in-place concrete layer form a concrete composite beam; F. Pour ordinary concrete on the upper end of the steel pipe.

[0021] Optionally, “A. providing a steel pipe and a node domain steel cage, arranging the node domain steel cage in the middle of the steel pipe, extending the column dowels of the node domain steel cage to the lower part of the steel pipe, and pouring ordinary concrete into the lower part of the steel pipe” specifically includes: A1. Provide an upper steel pipe, a lower steel pipe, a non-disassembly formwork and a node domain reinforcement cage, and fix the non-disassembly formwork around the node domain reinforcement cage; A2. Fix the lower steel pipe vertically, abut the non-disassembly formwork against the lower steel pipe, extend the column dowels of the node domain reinforcement cage into the lower steel pipe, and pour ordinary concrete into the lower steel pipe; “F. Pouring ordinary concrete on the upper end of the steel pipe” specifically includes: The upper steel pipe is butted against the non-dismantling formwork, the column dowel bars of the node domain reinforcement cage are extended into the upper steel pipe, and ordinary concrete is poured into the upper steel pipe.

[0022] Optionally, “A. providing a steel pipe and a node domain steel cage, arranging the node domain steel cage in the middle of the steel pipe, extending the column dowels of the node domain steel cage to the lower part of the steel pipe, and pouring ordinary concrete into the lower part of the steel pipe” specifically includes: A. Provide steel pipes and node domain steel cages, open upper holes and lower holes on the steel pipes, set node domain steel cages in the middle of the steel pipes, and fix the steel pipes vertically; pour ordinary concrete to the lower end of the steel pipes through the lower holes; In step B, the longitudinal reinforcement of the steel cage in the beam is inserted into the node domain steel cage through the lower hole; in step C, the through steel bar penetrates the node domain steel cage through the upper hole; in step E, UHPC is built toward the middle of the steel tube through the upper hole.

[0023] In summary, the present application includes at least one of the following beneficial technical effects: 1. Casting mixed oriented fiber UHPC in the node casting area shortens the anchorage length of the prefabricated component reinforcement, improves the vertical bearing capacity of the node area, avoids the use of traditional steel tube concrete column-concrete beam connection node area ring beam, simplifies the node structure, reduces the collision of reinforcement in the node area, significantly improves the performance of the connection node, and effectively solves the problems of poor stiffness of the connection node, poor integrity, easy cracking, complex structure, and cumbersome and difficult construction.

[0024] 2. By using the node domain steel cage-non-disassembly formwork integrated device, the support of the formwork during the node domain UHPC cast-in-place process is avoided, the construction process is reduced, the construction efficiency is improved, and it is suitable for prefabricated steel tube concrete frame structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a plan view of the steel tube concrete column-composite beam connection node structure in Example 1 of the present application; Figure 2 It is a schematic elevation view of the steel tube concrete column-composite beam connection node structure in Example 1 of the present application; Figure 3 It is a schematic diagram of the structure of the embedded threaded sleeve and the anchor steel bar with bolt anchor head in Example 1 of the present application; Figure 4 It is a three-dimensional schematic diagram of the non-disassembly formwork and the node domain reinforcement cage in Example 1 of the present application; Figure 5 is a schematic elevation view of the prefabricated beam height adjustment device in Example 1 of the present application; Figure 6 is a plan view of the prefabricated beam height adjustment device in Example 1 of the present application; Figure 7 It is a three-dimensional schematic diagram of the non-disassembly template and the upper steel pipe and the lower steel pipe in Example 2 of the present application; Figure 8 It is a plan view of the steel tube concrete column-composite beam connection node structure in Example 3 of the present application; Fig. 9 It is a schematic elevation view of the steel tube concrete column-composite beam connection node structure in Example 3 of the present application.

[0026] Description of reference numerals: 1. Concrete composite beam; 11. Precast beam; 111. Steel cage in beam; 111a. Beam longitudinal reinforcement; 111b. Beam stirrups; 112. Precast concrete layer; 113. Separator; 114. Groove; 12. Through reinforcement; 13. Cast-in-place concrete layer; 14. Node casting area; 15. Ordinary casting area; 2. Steel tube concrete column; 21. Steel tube; 211. Upper steel tube; 212. Lower steel tube; 213. No demolition Formwork; 214, steel plate; 215, upper hole; 216, lower hole; 217, slot; 218, bolt; 22, node domain reinforcement cage; 221, column dowel bar; 222, column stirrup; 23, shear stud; 24, reinforcement positioning device; 25, precast beam height adjustment device; 251, steel corbel; 252, fixing nut; 253, height adjustment bolt; 26, embedded threaded sleeve; 27, anchoring reinforcement with bolt anchor head. DETAILED DESCRIPTION

[0027] The following will be combined with the attached Figure 1-9 , the technical solutions in the embodiments of the present application are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0028] Example 1 Embodiment 1 of the present application discloses a steel tube concrete column-composite beam connection node structure, referring to Figure 1 and Figure 2 The steel tube concrete column-composite beam connection node structure includes a horizontally arranged concrete composite beam 1 and a vertically arranged steel tube concrete column 2.

[0029] The steel tube concrete column 2 includes a steel tube 21, a node domain steel cage 22 is provided in the middle of the steel tube 21, and the node domain steel cage 22 includes a column dowel 221 and a column stirrup 222. The column dowel 221 of the node domain steel cage 22 extends to the upper and lower parts of the steel tube 21. In this embodiment, the steel tube 21 includes an upper steel tube 211, a lower steel tube 212 and a non-removable formwork 213 (refer to Figure 3 ), the non-disassembly formwork 213 is fixed around the node domain reinforcement cage 22. Specifically, the upper steel pipe 211 and the lower steel pipe 212 are both square steel pipes, the non-disassembly formwork 213 is "L" shaped and has four, located at the four corners of the node domain reinforcement cage 22, the upper end of the non-disassembly formwork 213 is against the upper steel pipe 211, and the lower end is against the lower steel pipe 212, and the precast beam 11 is enclosed to form a casting space, and the non-disassembly formwork 213 is an "L" shaped UHPC board using steel fiber and slender organic fiber.

[0030] Reference Figure 2 Shear studs 23 are provided in the upper steel pipe 211 and the lower steel pipe 212. The top layer of column stirrups 222 in the node domain steel cage 22 fits with the bottom layer of shear studs 23 on the inner wall of the upper steel pipe 211, and the bottom layer of column stirrups 222 in the node domain steel cage 22 fits with the top layer of shear studs 23 on the inner wall of the lower steel pipe 212.

[0031] The concrete composite beam 1 includes a precast beam 11, a through steel bar 12 and a cast-in-place concrete layer 13. The precast beam 11 includes a beam inner steel cage 111 and a precast concrete layer 112 wrapping the lower part of the beam inner steel cage 111. The beam inner steel cage 111 includes a beam longitudinal bar 111a and a beam stirrup 111b. The end of the beam longitudinal bar 111a of the beam inner steel cage 111 is exposed and inserted into the node domain steel cage 22. For details, refer to Figure 4The end of the beam longitudinal reinforcement 111a is threadedly connected with a pre-embedded threaded sleeve 26, which is connected to the anchor steel bar 27 with a bolt anchor head, and the end of the anchor steel bar 27 with a bolt anchor head extends into the node domain reinforcement cage 22. The through steel bar 12 passes through the beam reinforcement cage 111 and the node domain reinforcement cage 22, and the upper part of the beam reinforcement cage 111 is a cast-in-place belt.

[0032] A partition 113 is provided in the cast-in-place strip. In the present embodiment, the partition 113 is a steel wire mesh, which divides the cast-in-place strip into a node casting area 14 connected to the middle of the steel pipe 21 and a common casting area 15 away from the steel pipe 21. UHPC is cast in the node casting area 14 and the middle of the steel pipe 21. UHPC is an ultra-high performance concrete mixed with oriented fibers. Common concrete is cast in the common casting area 15 to form a cast-in-place concrete layer 13.

[0033] Ordinary concrete is poured on the upper part of the steel tube 21 to form an upper steel tube concrete column, and ordinary concrete is poured on the lower part to form a lower steel tube concrete column. The upper steel tube concrete column and the lower steel tube concrete column are connected and transmitted through the column dowel 221 of the node domain steel cage 22, the concrete in the column and the shear stud 23. The column dowel 221 is spot welded to the shear stud 23 or the inner wall of the steel tube 21, which can fix the node domain steel cage 22 during the concrete pouring process.

[0034] The non-removal formwork 213 is located at the four corner points of the node domain steel cage 22. The lower part of the area between adjacent non-removal formwork 213 is blocked by the precast beam 11, and the upper part is connected to the node casting area 14. The non-removal formwork 213 is connected to the upper steel pipe 211 and the lower steel pipe 212 on the one hand, and on the other hand, it is surrounded by the precast beam 11 to form a casting area, avoiding the support of the formwork during the node domain cast-in-place UHPC process. The non-removal formwork 213 is an "L"-shaped UHPC board using steel fiber and slender organic fiber, which can ensure that there is no "mold expansion" phenomenon during the concrete pouring process. The use of slender organic fiber can make the non-removal formwork 213 achieve the effect of "crack but not break" during earthquake action.

[0035] The precast concrete layer 112 is provided with a groove 114 at one end close to the steel pipe 21 for UHPC to be embedded. Ultra-high performance concrete (UHPC) is a new type of cement-based composite material. Its compressive strength is usually above 120MPa, its toughness is more than 300 times that of ordinary concrete, its tensile strength can reach 10MPa, and its elastic modulus is about 50-60GPa (close to 2 times that of ordinary concrete). In addition to having excellent mechanical properties (high strength, high toughness, impact resistance, etc.), it also has excellent properties such as high bonding performance, fatigue resistance, and wear resistance.

[0036] Casting the mixed directional fiber UHPC in the node casting area 14 and the middle of the steel pipe 21 shortens the anchorage length of the prefabricated component reinforcement, improves the vertical bearing capacity of the node area, avoids the use of the traditional steel tube concrete column 2-concrete beam connection node area ring beam, simplifies the node structure, reduces the collision of steel bars in the node area, significantly improves the performance of the connection node, and effectively solves the problems of poor stiffness, poor integrity, easy cracking, complex structure, and cumbersome and difficult construction of the connection node. By using the node domain reinforcement cage 22-non-removal formwork 213 integrated device, the support of the formwork during the node domain UHPC casting process is avoided, the construction process is reduced, and the construction efficiency is improved. It is suitable for assembled steel tube 21 concrete frame structure. A prefabricated beam height adjustment device 25 is set on the outer wall of the steel pipe 2. During the installation of the prefabricated beam 11, the prefabricated beam height adjustment device 25 can act as a bracket and can also fine-tune the height of the prefabricated beam 11.

[0037] In this embodiment, refer to Figure 5 and Figure 6 The prefabricated beam height adjustment device 25 includes a steel corbel 251 fixedly connected to the outer side wall of the lower steel pipe 212, a fixing nut 252 is provided above the steel corbel 251, a height adjustment bolt 253 is threadedly connected to the fixing nut 252, and the top of the height adjustment bolt 253 is fixedly connected to the prefabricated beam 11. By adjusting the position where the fixing nut 252 is connected to the height adjustment bolt 253, the height of the prefabricated beam 11 can be finely adjusted.

[0038] Example 2 The difference between Example 2 and Example 1 is that the connection method between the non-disassembly template 213 and the upper steel pipe 211 and the lower steel pipe 212 is different. Figure 7 In this embodiment, a slot 217 is provided on the outer side wall of the upper end of the lower steel pipe 212, and the lower end of the non-disassembly template 213 is inserted into the slot 217. A perforation is provided on the upper steel pipe 211, and an oblong hole is provided on the upper end of the non-disassembly template 213. Bolts 218 pass through the perforations of the upper steel pipe 211 and the oblong holes of the non-disassembly template 213 and are connected with nuts to realize the fixed connection between the upper steel pipe 211 and the non-disassembly template 213. The non-disassembly template 213 is made of a thin-walled steel template with a thickness of 1 to 3 mm.

[0039] Example 3 The difference between Example 3 and Example 1 is that the steel pipe 21 in Example 1 is completely disconnected, while the steel pipe 21 in Example 3 is not completely disconnected. Figure 8 and Fig. 9An upper hole 215 and a lower hole 216 are provided in the middle of the steel pipe 21. The longitudinal reinforcement 111a of the steel cage 111 in the beam passes through the lower hole 216 and is fixedly connected to the steel pipe 21. Specifically, it is connected through the embedded threaded sleeve 26 and the anchor steel bar 27 with a bolt anchor head, and the through steel bar 12 passes through the upper hole 215. Ordinary concrete at the lower part of the steel pipe 21 is poured through the lower hole 216, and the UHPC in the middle part of the steel pipe 21 is poured through the upper hole 215. In this way, the construction process of the steel pipe 21 is simplified and the strength of the steel pipe 21 is enhanced. The setting of the upper hole 215 and the lower hole 216 makes concrete pouring more convenient, eliminates the support of the formwork, ensures the precise pouring of concrete in different areas, and thus improves the quality and safety of the structure. Shear steel bars are welded to the upper hole 215 and the lower hole 216, thereby improving the shear resistance of the composite beam. Specifically, in an optional embodiment, the disconnection between the column steel pipes is set at about 1.2m above the steel pipe opening and is connected by welding.

[0040] A steel bar positioning device 24 is provided in the steel pipe 21, located below the lower hole 216, for positioning the node domain steel cage 22. The positioning device can ensure the correct position of the node domain steel cage 22 in the steel pipe 21, and avoid displacement of the steel cage during concrete pouring, thereby ensuring the stability and safety of the structure. In this embodiment, the steel pipe 21 is an incompletely disconnected type. Compared with the steel pipe 21 in Example 1, which is completely disconnected, the steel pipe 21 in this embodiment is stronger, so the number of column stirrups 222 in the node domain steel cage 22 can be reduced.

[0041] The longitudinal reinforcement 111a of the beam at the lower part of the steel cage 111 in the beam passes through the lower hole 216 and extends into the steel pipe 2. In an optional embodiment, the longitudinal reinforcement 111a of the beam at the lower part of the steel cage 111 in the beam includes a force-bearing longitudinal reinforcement and an outwardly extending anchoring section reinforcement. A threaded sleeve for connecting the force-bearing longitudinal reinforcement is pre-embedded at the end of the precast beam 11. After the precast beam 11 is installed, the outwardly extending anchoring section reinforcement is screwed into the threaded sleeve, and the force-bearing longitudinal reinforcement inside the precast beam 11 is connected to the outwardly extending anchoring section reinforcement through the threaded sleeve, which can avoid the collision problem between the outwardly extending anchoring section reinforcement and the node domain stirrup during the installation of the precast beam 11.

[0042] Example 4 Example 4 discloses a construction method for a steel tube concrete column-composite beam connection node structure, which is used to construct the node structure in Example 1, and includes the following steps: A. Provide an upper steel pipe 211, a lower steel pipe 212, a non-removal formwork 213 and a node domain steel cage 22, fix the non-removal formwork 213 around the node domain steel cage 22; fix the lower steel pipe 212 vertically, abut the non-removal formwork 213 against the lower steel pipe 212, extend the column dowel 221 of the node domain steel cage 22 into the lower steel pipe 212, and pour ordinary concrete into the lower steel pipe 212; B. Provide a precast beam 11, the precast beam 11 includes an inner beam reinforcement cage 111 and a precast concrete layer 112 wrapping the lower part of the inner beam reinforcement cage 111; set up a temporary support, and insert the beam longitudinal reinforcement 111a of the inner beam reinforcement cage 111 into the node domain reinforcement cage 22; C. Provide through steel bars 12, and place the through steel bars 12 on the top of the steel cage 111 in the beam and penetrate the node domain steel cage 22; D. The upper part of the steel cage 111 in the beam is a cast-in-place belt. The upper cast-in-place belt is supported by formwork, and a separator 113 is set in the cast-in-place belt to separate the cast-in-place belt into a node casting area 14 connected to the middle of the steel pipe 21 and a common casting area 15 away from the steel pipe 21; E. First, pour UHPC into the node pouring area 14, and then pour ordinary concrete into the ordinary pouring area 15, and then perform curing after sufficient vibration to form a cast-in-place concrete layer 13. The lower precast beam 11 and the upper cast-in-place concrete layer 13 form a concrete composite beam 1; F. Place the upper steel pipe 211 against the non-removable formwork 213, extend the column dowels 221 of the node domain reinforcement cage 22 into the upper steel pipe 211, pour ordinary concrete into the upper steel pipe 211 to fully cover the column dowels 221, and perform vibration maintenance.

[0043] Example 5 Example 5 discloses a construction method for a steel tube concrete column-composite beam connection node structure, which is used to construct the node structure in Example 3, and includes the following steps: A. Provide a steel pipe 21 and a node domain steel cage 22, open an upper hole 215 and a lower hole 216 in the middle of the steel pipe 21, set the node domain steel cage 22 in the middle of the steel pipe 21, and fix the steel pipe 21 vertically; pour ordinary concrete to the lower end of the steel pipe 21 through the lower hole 216; B. Provide a precast beam 11, the precast beam 11 includes an inner beam reinforcement cage 111 and a precast concrete layer 112 wrapping the lower part of the inner beam reinforcement cage 111; set up a temporary support, and insert the longitudinal reinforcement 111a of the inner beam reinforcement cage 111 into the node domain reinforcement cage 22 through the lower hole 216; C. Provide through steel bars 12, place the through steel bars 12 on the top of the steel cage 111 in the beam and penetrate the node domain steel cage 22 through the upper hole 215; D. The upper part of the steel cage 111 in the beam is a cast-in-place belt. The upper cast-in-place belt is supported by formwork, and a separator 113 is set in the cast-in-place belt to separate the cast-in-place belt into a node casting area 14 connected to the middle of the steel pipe 21 and a common casting area 15 away from the steel pipe 21; E. Cast UHPC into the node casting area 14, cast UHPC into the middle of the steel pipe 21 through the upper hole 215, and then cast ordinary concrete into the common casting area 15, and perform curing after sufficient vibration to form a cast-in-place concrete layer 13. The lower precast beam 11 and the upper cast-in-place concrete layer 13 form a concrete composite beam 1; F. Pour ordinary concrete on the upper part of the steel pipe 21 to fully cover the column dowel 221, and perform vibration curing.

[0044] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation" and "connection" 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 it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying 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 on the present application. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0046] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A steel tube concrete column-composite beam connection node structure, characterized in that: The invention comprises a concrete composite beam (1) and a steel tube concrete column (2); the concrete composite beam (1) comprises a precast beam (11), a through steel bar (12) and a cast-in-place concrete layer (13); the precast beam (11) comprises a beam inner steel cage (111) and a precast concrete layer (112) wrapping the lower part of the beam inner steel cage (111); the steel tube concrete column (2) comprises a steel tube (21); a node domain steel cage (22) is provided in the middle of the steel tube (21); a column dowel bar (221) of the node domain steel cage (22) extends to the upper and lower parts of the steel tube (21); an end of the beam inner steel cage (111) is inserted into the node domain steel cage (22); the through steel bar (12) passes through the beam inner steel cage (111) and the node domain steel cage (22); and the upper part of the beam inner steel cage (111) is a cast-in-place strip; A partition (113) is provided in the cast-in-place strip, dividing the cast-in-place strip into a node casting area (14) connected to the middle of the steel pipe (21) and a common casting area (15) away from the steel pipe (21); the node casting area (14) is cast with UHPC, and the common casting area (15) is cast with common concrete to form a cast-in-place concrete layer (13); the upper part and the lower part of the steel pipe (21) are both cast with common concrete.

2. The steel tube concrete column-composite beam connection node structure according to claim 1, characterized in that: The steel pipe (21) comprises an upper steel pipe (211), a lower steel pipe (212) and a non-disassembly formwork (213); the non-disassembly formwork (213) is arranged around the node domain reinforcement cage (22); the upper end of the non-disassembly formwork (213) abuts against the upper steel pipe (211), and the lower end abuts against the lower steel pipe (212), thereby enclosing a casting space with the prefabricated beam (11).

3. The steel tube concrete column-composite beam connection node structure according to claim 2, characterized in that: Shear studs (23) are provided in both the upper steel pipe (211) and the lower steel pipe (212), and two column stirrups (222) at the end of the node domain reinforcement cage (22) are both against the corresponding shear studs (23).

4. The steel tube concrete column-composite beam connection node structure according to claim 2, characterized in that: The non-removable formwork (213) is an "L"-shaped UHPC board made of steel fibers and slender organic fibers.

5. The steel tube concrete column-composite beam connection node structure according to claim 1, characterized in that: An upper hole (215) and a lower hole (216) are provided in the middle of the steel pipe (21); the longitudinal reinforcement (111a) of the steel cage (111) in the beam passes through the lower hole (216) and is fixedly connected to the steel pipe (21); the through reinforcement (12) passes through the upper hole (215); ordinary concrete at the lower part of the steel pipe (21) is poured through the lower hole (216), and UHPC at the middle part of the steel pipe (21) is poured through the upper hole (215).

6. The steel tube concrete column-composite beam connection node structure according to claim 5, characterized in that: A steel bar positioning device (24) is provided in the steel pipe (21), located below the lower hole (216), and is used to position the node domain steel bar cage (22).

7. The steel tube concrete column-composite beam connection node structure according to any one of claims 1 to 6, characterized in that: The precast concrete layer (112) is provided with a groove (114) at one end close to the steel pipe (21) for UHPC to be embedded.

8. A construction method for a steel tube concrete column-composite beam connection node structure, characterized in that: The following steps are involved: A. providing a steel pipe (21) and a node domain steel cage (22), fixing the node domain steel cage (22) to the middle of the steel pipe (21), extending the column dowel bars (221) of the node domain steel cage (22) to the lower part of the steel pipe (21), and pouring ordinary concrete to the lower part of the steel pipe (21); B. providing a prefabricated beam (11), wherein the prefabricated beam (11) comprises an inner beam reinforcement cage (111) and a prefabricated concrete layer (112) wrapping the lower part of the inner beam reinforcement cage (111); setting up a temporary support, and inserting the longitudinal reinforcement (111a) of the inner beam reinforcement cage (111) into the node domain reinforcement cage (22); C. providing a through steel bar (12), and placing the through steel bar (12) on the top of the steel cage (111) in the beam and passing through the node domain steel cage (22); D. The upper part of the steel cage (111) in the beam is a cast-in-place belt, a formwork is provided for the upper cast-in-place belt, and a separator (113) is arranged in the cast-in-place belt to separate the cast-in-place belt into a node casting area (14) connected to the middle of the steel pipe (21) and a common casting area (15) away from the steel pipe (21); E. First, pour UHPC into the node pouring area (14), then pour ordinary concrete into the ordinary pouring area (15), and perform curing after sufficient vibration to form a cast-in-place concrete layer (13). The lower precast beam (11) and the upper cast-in-place concrete layer (13) form a concrete composite beam (1); F. Pour ordinary concrete onto the upper end of the steel pipe (21).

9. The construction method of the steel tube concrete column-composite beam connection node structure according to claim 8, characterized in that: "A. providing a steel pipe (21) and a node domain steel cage (22), arranging the node domain steel cage (22) in the middle of the steel pipe (21), extending the column dowel bars (221) of the node domain steel cage (22) to the lower part of the steel pipe (21), and pouring ordinary concrete into the lower part of the steel pipe (21)" specifically includes: A1. providing an upper steel pipe (211), a lower steel pipe (212), a non-removal formwork (213) and a node domain reinforcement cage (22), and fixing the non-removal formwork (213) around the node domain reinforcement cage (22); A2, fixing the lower steel pipe (212) vertically, abutting the non-removal formwork (213) against the lower steel pipe (212), extending the column dowel bars (221) of the node domain reinforcement cage (22) into the lower steel pipe (212), and pouring ordinary concrete into the lower steel pipe (212); "F. pouring ordinary concrete onto the upper end of the steel pipe (21)" specifically includes: The upper steel pipe (211) is abutted against the non-removable formwork (213), the column dowel bars (221) of the node domain reinforcement cage (22) are extended into the upper steel pipe (211), and ordinary concrete is poured into the upper steel pipe (211).

10. The construction method of the steel tube concrete column-composite beam connection node structure according to claim 8, characterized in that: "A. providing a steel pipe (21) and a node domain steel cage (22), arranging the node domain steel cage (22) in the middle of the steel pipe (21), extending the column dowel bars (221) of the node domain steel cage (22) to the lower part of the steel pipe (21), and pouring ordinary concrete into the lower part of the steel pipe (21)" specifically includes: A. providing a steel pipe (21) and a node domain steel cage (22), opening an upper hole (215) and a lower hole (216) on the steel pipe (21), arranging the node domain steel cage (22) in the middle of the steel pipe (21), and fixing the steel pipe (21) vertically; pouring ordinary concrete to the lower end of the steel pipe (21) through the lower hole (216); In step B, the longitudinal reinforcement (111a) of the reinforcement cage (111) in the beam is inserted into the node domain reinforcement cage (22) through the lower hole (216); in step C, the through reinforcement (12) penetrates the node domain reinforcement cage (22) through the upper hole (215); in step E, UHPC is built toward the middle of the steel pipe (21) through the upper hole (215).

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