Joint of concrete filled steel tubular column and split-level reinforced concrete frame beam and construction method

Abstract

The invention discloses a concrete-filled steel tube column and split-level reinforced concrete frame beam joint and a construction method, the concrete-filled steel tube column and split-level reinforced concrete frame beam joint comprises a concrete-filled steel tube column body, a cross-shaped fixing frame is fixedly mounted in the middle of the concrete-filled steel tube column body, and a first split-level reinforced concrete beam is mounted at the top end of one side of the cross-shaped fixing frame; a first split-level reinforced concrete beam is installed at the bottom end of one side of the cross-shaped fixing frame, a second split-level reinforced concrete beam is installed at the bottom end of the other side of the cross-shaped fixing frame, and first profile steel brackets are installed on the two sides of the connecting position of the first split-level reinforced concrete beam and the cross-shaped fixing frame. A built-in anti-bending steel corbel transition section is adopted to arrange an anti-shearing stud in a built-in steel cow leg section to ensure the cooperative work of a beam end combination section, and the combination section resists the bending moment transmitted by the beam end; meanwhile, an anti-shearing steel corbel is combined to resist shearing force; on the basis of the current specifications and atlas, the structure of the concrete filled steel tube and split-level beam connecting joint is supplemented.

Description

Technical Field

[0001] The present invention relates to the technical field of the construction of concrete-filled steel tubular columns, and particularly to a node between a concrete-filled steel tubular column and a staggered reinforced concrete frame beam and a construction method thereof. Background Art

[0002] Reinforced concrete frame structures have been widely used in modern buildings due to many advantages. First, reinforced concrete can easily produce structural materials with high strength, durability, and corrosion resistance, so they have a long service life. Second, reinforced concrete frame structures can provide strong protection against natural disasters such as earthquakes and wind disasters, and can withstand huge impact forces and horizontal vibration forces, so they have high stability and safety. The staggered reinforced concrete frame beam is a kind of existing reinforced concrete frame.

[0003] Compared with reinforced concrete structures, steel-concrete composite structures can reduce the cross-sectional dimensions of components, reduce the self-weight of the structure, reduce seismic responses, increase effective space, reduce foundation costs, and increase the ductility and durability of components and structures. Therefore, using steel-concrete composite structure components can significantly improve the bearing capacity, seismic performance, and durability of the structure within a reasonable cost range.

[0004] However, the construction of traditional steel-concrete composite structures has the following disadvantages:

[0005] (1) When constructing traditional steel-concrete composite structures, only the construction of the node structure connecting the concrete-filled steel tube and the equal-height beam can be installed, and the construction method of the node structure connecting the concrete-filled steel tube and the unequal-height beam is not given;

[0006] (2) For the conventional ring beam structure, the cross-sectional plane size and beam height of the ring beam are relatively large, the node occupies a large indoor floor area, and it is easy to collide with indoor pipelines, occupying the pipeline crossing path;

[0007] (3) For the conventional beam-piercing method, the positioning accuracy of the steel bar piercing position is high, the construction difficulty is large, and the construction period is long;

[0008] (4) For the beam-bypassing method, the beam end needs to be axially stiffened, the construction is complex, and at the same time, the force of transmitting the bending moment at the node is relatively unclear, and the beam at the axially stiffened part is easy to collide with indoor pipelines, occupying the pipeline crossing path. Summary of the Invention

[0009] The object of the present invention is to provide a joint between a concrete-filled steel tube column and a staggered reinforced concrete frame beam and a construction method, so as to solve the problems in the above-mentioned background technology. During the construction of the traditional steel-concrete composite structure, only the joint structure for connecting the concrete-filled steel tube with the equal-height beam can be installed, and the construction method for the joint structure of the concrete-filled steel tube connected with the unequal-height beam is not given; for the conventional ring beam structure, the cross-sectional plane size and beam height of the ring beam are relatively large, the joint occupies a large indoor floor area, and it is easy to collide with indoor pipelines, occupying the pipeline crossing path; for the conventional beam-piercing method, the positioning accuracy of the steel bar piercing position is high, the construction difficulty is large, and the construction period is long; for the beam-wrapping method, the beam end needs to be axially stiffened, the construction is complex, and at the same time, the force for transmitting the bending moment at the joint is relatively unclear, and the beam at the axially stiffened part is easy to collide with indoor pipelines, occupying the pipeline crossing path.

[0010] To achieve the above object, the present invention provides the following technical solution: A joint between a concrete-filled steel tube column and a staggered reinforced concrete frame beam, including a concrete-filled steel tube column body. A cross-shaped fixing frame is fixedly installed in the middle of the concrete-filled steel tube column body. A first staggered reinforced concrete beam is installed at the top end on one side of the cross-shaped fixing frame, and a second staggered reinforced concrete beam is installed at the bottom end on the other side of the cross-shaped fixing frame. First steel profile corbels are installed on both sides of the connection between the first staggered reinforced concrete beam and the cross-shaped fixing frame, and second steel profile corbels are installed on both sides of the connection between the second staggered reinforced concrete beam and the cross-shaped fixing frame. A number of shear studs are threadedly connected to the surfaces of the two first steel profile corbels and the surfaces of the two second steel profile corbels.

[0011] As a preferred technical solution of the present invention, the surfaces of the two first steel profile corbels are fixedly connected to the first staggered reinforced concrete beam through shear studs.

[0012] As a preferred technical solution of the present invention, the surfaces of the two second steel profile corbels are fixedly connected to the second staggered reinforced concrete beam through shear studs.

[0013] As a preferred technical solution of the present invention, strengthening rings are sleeved at the connections between the cross-shaped fixing frame and the first staggered reinforced concrete beam and between the cross-shaped fixing frame and the second staggered reinforced concrete beam.

[0014] As a preferred technical solution of the present invention, the concrete-filled steel tube column body includes a soil column tube and main beam stirrups. The outside of the soil column tube is fixedly connected to the inside of the main beam stirrups. A number of frame beam longitudinal bars are fixedly installed on the outside of the main beam stirrups. A number of concrete pouring holes are formed on the surface of the main beam stirrups, and a number of ring beam stirrups are fixedly installed inside the main beam stirrups.

[0015] As a preferred technical solution of the present invention, stiffening ribs are fixedly installed at both ends on both sides of the inner wall of the cross-shaped fixing frame.

[0016] As a preferred technical solution of the present invention, reinforcing bar sleeves are installed between several of the longitudinal bars of the frame beams.

[0017] As a preferred technical solution of the present invention, the cross-shaped fixing frame includes a central platform and two telescopic rod bodies. A first height platform is provided at the top of the central platform, and a second height platform is provided at the bottom of the central platform. The middle parts of the top and bottom of the central platform are respectively fixedly connected to the fixed ends of the two telescopic rod bodies. The movable ends of the two telescopic rod bodies are respectively fixedly connected to the middle parts of the bottom of the first height platform and the middle parts of the top of the second height platform. Fixed seats are fixedly installed on both sides of the two telescopic rod bodies. Connecting plates are rotatably connected inside the four fixed seats. The ends of the four connecting plates away from the fixed seats are rotatably connected to sliding seats. The four sliding seats are all slidably connected to the central platform. Self-locking telescopic rods are rotatably connected to the middle parts of both sides of the two telescopic rod bodies. The movable ends of the two self-locking telescopic rods are respectively rotatably connected to the middle parts of the four connecting plates. Springs are fixedly installed on the surfaces of the four connecting plates. The ends of the four springs away from the connecting plates are fixedly connected to the side of the central platform facing each other. The vertical distance between the first height platform and the central platform is equal to the beam width of the first staggered reinforced concrete beam, and the vertical distance between the second height platform and the central platform is equal to the beam width of the second staggered reinforced concrete beam. The inside of the central platform is connected to the steel tube concrete column body.

[0018] As a preferred technical solution of the present invention, both the first staggered reinforced concrete beam and the second staggered reinforced concrete beam include a concrete frame and a steel bar frame. The inner side of the concrete frame is fixedly connected to the outer side of the steel bar frame. A number of beam bodies extending to the outside are fixedly installed inside the steel bar frame. Reinforcing bars are fixedly installed on both sides of the bottom of the concrete frame. One side of the concrete frame located on the first staggered reinforced concrete beam and one side of the second staggered reinforced concrete beam are both connected to the cross-shaped fixing frame.

[0019] The construction method of the joint between the steel tube concrete column and the staggered reinforced concrete frame beam of the present invention includes the following steps:

[0020] Step 1: Install the cross-shaped fixing frame: Install the cross-shaped fixing frame on the outside of the steel tube concrete column body;

[0021] Step 2: Install the first staggered reinforced concrete beam: Install the first staggered reinforced concrete beam on one side of the cross-shaped fixing frame, and there is a first transition section at the connection between the two;

[0022] Step 3: Reinforce the first transition section: Use the first steel section bracket and shear studs to reinforce the first transition section;

[0023] Step 4. Install the second stepped reinforced concrete beam: Install the second stepped reinforced concrete beam on one side of the cross-shaped fixing frame, and there is a second transition section at the connection between the two;

[0024] Step 5. Reinforce the second transition section: Use the second steel-shaped corbel and shear studs to reinforce the second transition section.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0026] 1. The structure at the joint is simple and the force transmission path is clear;

[0027] 2. Innovatively invent the connection joint between the concrete-filled steel tube column and the stepped reinforced concrete beam. An internal bending-resistant steel corbel transition section is adopted, and shear studs are arranged in the internal steel corbel section to ensure the coordinated work of the combined section at the beam end. The combined section resists the bending moment transmitted from the beam end; at the same time, a shear-resistant steel corbel is combined to resist the shear force;

[0028] 3. On the basis of the current codes and atlases, the structure of the connection joint between the concrete-filled steel tube and the stepped beam is supplemented. Brief Description of the Drawings

[0029] Figure 1 It is the detailed drawing of the connection joint between the concrete-filled steel tube column and the stepped reinforced concrete beam of the present invention;

[0030] Figure 2 It is the plan view of the connection joint between the concrete-filled steel tube column and the stepped reinforced concrete beam of the present invention;

[0031] Figure 3 It is the flow chart of the present invention;

[0032] Figure 4 It is the structural schematic diagram of the cross-shaped fixing frame of the present invention;

[0033] Figure 5 It is the structural schematic diagram of the first stepped reinforced concrete beam of the present invention.

[0034] In the figure: 1. Concrete-filled steel tube column body; 101. Soil column tube; 102. Main beam hoop; 103. Frame beam longitudinal reinforcement; 104. Ring beam stirrup; 105. Concrete pouring hole; 2. Cross-shaped fixing frame; 21. Central platform; 22. First height platform; 23. Telescopic rod body; 24. Sliding seat; 25. Spring; 26. Connecting plate; 27. Second height platform; 28. Self-locking telescopic rod; 29. Fixed seat; 3. First stepped reinforced concrete beam; 31. Concrete frame; 32. Steel bar frame; 33. Steel bar column; 34. Beam body; 4. First steel-shaped corbel; 5. Reinforcing ring; 6. Shear stud; 7. Second stepped reinforced concrete beam; 8. Stiffening rib; 9. Second steel-shaped corbel; 10. Steel bar sleeve. Detailed Embodiments

[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0036] Please refer to Figures 1-5 , the present invention provides a joint between a concrete-filled steel tube column and a staggered reinforced concrete frame beam, including a concrete-filled steel tube column body 1. A cross-shaped fixing frame 2 is fixedly installed in the middle of the concrete-filled steel tube column body 1. A first staggered reinforced concrete beam 3 is installed at the top end on one side of the cross-shaped fixing frame 2, and a second staggered reinforced concrete beam 7 is installed at the bottom end on the other side of the cross-shaped fixing frame 2. First steel corbels 4 are installed on both sides of the connection between the first staggered reinforced concrete beam 3 and the cross-shaped fixing frame 2, and second steel corbels 9 are installed on both sides of the connection between the second staggered reinforced concrete beam 7 and the cross-shaped fixing frame 2. A plurality of shear studs 6 are threadedly connected to the surfaces of the two first steel corbels 4 and the surfaces of the two second steel corbels 9.

[0037] The surfaces of the two first steel corbels 4 are fixedly connected to the first staggered reinforced concrete beam 3 through the shear studs 6.

[0038] The surfaces of the two second steel corbels 9 are fixedly connected to the second staggered reinforced concrete beam 7 through the shear studs 6.

[0039] Reinforcing rings 5 are sleeved at the connections between the cross-shaped fixing frame 2 and the first staggered reinforced concrete beam 3 and between the cross-shaped fixing frame 2 and the second staggered reinforced concrete beam 7.

[0040] The concrete-filled steel tube column body 1 includes a soil column tube 101 and main beam hoop bars 102. The outer side of the soil column tube 101 is fixedly connected to the inner side of the main beam hoop bars 102. A plurality of frame beam longitudinal bars 103 are fixedly installed on the outer side of the main beam hoop bars 102. A plurality of concrete pouring holes 105 are formed on the surface of the main beam hoop bars 102, and a plurality of ring beam stirrups 104 are fixedly installed inside the main beam hoop bars 102.

[0041] Stiffening ribs 8 are fixedly installed at both ends on both sides of the inner wall of the cross-shaped fixing frame 2.

[0042] Reinforcing sleeves 10 are installed between a plurality of frame beam longitudinal bars 103.

[0043] The cross-shaped fixing frame 2 includes a central platform 21 and two telescopic rod bodies 23. At the top of the central platform 21, there is a first height platform 22, and at the bottom of the central platform 21, there is a second height platform 27. The middle part of the top of the central platform 21 and the middle part of the bottom of the central platform 21 are respectively fixedly connected to the fixed ends of the two telescopic rod bodies 23. The movable ends of the two telescopic rod bodies 23 are respectively fixedly connected to the middle part of the bottom of the first height platform 22 and the middle part of the top of the second height platform 27. Fixed seats 29 are fixedly installed on both sides of the two telescopic rod bodies 23. Connecting plates 26 are rotatably connected inside the four fixed seats 29. One end of each of the four connecting plates 26 away from the fixed seat 29 is rotatably connected to a sliding seat 24. The four sliding seats 24 are all slidably connected to the central platform 21. Self-locking telescopic rods 28 are rotatably connected to the middle parts on both sides of the two telescopic rod bodies 23. The movable ends of the two self-locking telescopic rods 28 are respectively rotatably connected to the middle parts of the four connecting plates 26. Springs 25 are fixedly installed on the surfaces of the four connecting plates 26. One end of each of the four springs 25 away from the connecting plate 26 is fixedly connected to the side of the central platform 21 opposite thereto. The vertical distance between the first height platform 22 and the central platform 21 is equal to the beam width of the first staggered reinforced concrete beam 3, and the vertical distance between the second height platform 27 and the central platform 21 is equal to the beam width of the second staggered reinforced concrete beam 7. The inside of the central platform 21 is connected to the concrete-filled steel tube column body 1.

[0044] Both the first staggered reinforced concrete beam 3 and the second staggered reinforced concrete beam 7 include a concrete frame 31 and a steel bar frame 32. The inner side of the concrete frame 31 is fixedly connected to the outer side of the steel bar frame 32. A number of beam bodies 34 extending to the outside are fixedly installed inside the steel bar frame 32. Steel bar columns 33 are fixedly installed on both sides of the bottom end of the concrete frame 31. One side of the concrete frame 31 located on the first staggered reinforced concrete beam 3 and one side of the second staggered reinforced concrete beam 7 are both connected to the cross-shaped fixing frame 2.

[0045] The construction method of the joint between the concrete-filled steel tube column and the staggered reinforced concrete frame beam of the present invention includes the following steps:

[0046] Step 1, installing the cross-shaped fixing frame 2: Install the cross-shaped fixing frame 2 on the outside of the concrete-filled steel tube column body 1;

[0047] Step 2, installing the first staggered reinforced concrete beam 3: Install the first staggered reinforced concrete beam 3 on one side of the cross-shaped fixing frame 2, and there is a first transition section at the connection between the two;

[0048] Step 3, reinforcing the first transition section: Use the first steel section bracket 4 and shear studs 6 to reinforce the first transition section;

[0049] Step 4, installing the second staggered reinforced concrete beam 7: Install the second staggered reinforced concrete beam 7 on one side of the cross-shaped fixing frame 2, and there is a second transition section at the connection between the two;

[0050] Step Five, Reinforcement of the Second Transition Section: Use the second steel corbel 9 and shear studs 6 to reinforce the second transition section.

[0051] In the present invention, a cross-shaped fixing frame 2 is installed on the outer side of the concrete-filled steel tube column body 1; a first stepped reinforced concrete beam 3 is installed on one side of the cross-shaped fixing frame 2, and there is a first transition section at the connection between the two; use the first steel corbel 4 and shear studs 6 to reinforce the first transition section; a second stepped reinforced concrete beam 7 is installed on one side of the cross-shaped fixing frame 2, and there is a second transition section at the connection between the two; use the second steel corbel 9 and shear studs 6 to reinforce the second transition section.

[0052] Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A node between a steel tube concrete column and a staggered reinforced concrete frame beam, comprising a steel tube concrete column body (1), characterized in that: A cross fixing frame (2) is fixedly installed in the middle of the steel tube concrete column body (1); a first staggered reinforced concrete beam (3) is installed at the top end of one side of the cross fixing frame (2); a second staggered reinforced concrete beam (7) is installed at the bottom end of the other side of the cross fixing frame (2); first steel brackets (4) are installed on both sides of the connection between the first staggered reinforced concrete beam (3) and the cross fixing frame (2); second steel brackets (9) are installed on both sides of the connection between the second staggered reinforced concrete beam (7) and the cross fixing frame (2); and a plurality of shear bolts (6) are threadedly connected to the surfaces of the two first steel brackets (4) and the two second steel brackets (9).

2. The node of the steel tube concrete column and the staggered reinforced concrete frame beam according to claim 1 is characterized in that: The surfaces of the two first-type steel brackets (4) are fixedly connected to the first staggered reinforced concrete beam (3) via shear bolts (6).

3. The node of the steel tube concrete column and the staggered reinforced concrete frame beam according to claim 1 is characterized in that: The surfaces of the two second-type steel brackets (9) are fixedly connected to the second staggered reinforced concrete beam (7) via shear studs (6).

4. The node of the steel tube concrete column and the staggered reinforced concrete frame beam according to claim 1 is characterized in that: A reinforcement ring (5) is sleeved on the connection between the cross fixing frame (2) and the first staggered reinforced concrete beam (3) and the connection between the cross fixing frame (2) and the second staggered reinforced concrete beam (7).

5. The node of the steel tube concrete column and the staggered reinforced concrete frame beam according to claim 1 is characterized in that: The steel tube concrete column body (1) comprises a soil column tube (101) and a main beam ring reinforcement (102); the outer side of the soil column tube (101) is fixedly connected to the inner side of the main beam ring reinforcement (102); a plurality of frame beam longitudinal reinforcements (103) are fixedly installed on the outer side of the main beam ring reinforcement (102); a plurality of concrete pouring holes (105) are opened on the surface of the main beam ring reinforcement (102); and a plurality of ring beam stirrups (104) are fixedly installed inside the main beam ring reinforcement (102).

6. The joint between the steel tube concrete column and the staggered reinforced concrete frame beam according to claim 1, characterized in that: Stiffening ribs (8) are fixedly mounted on both ends of the inner wall of the cross fixing frame (2).

7. The node of the steel tube concrete column and the staggered reinforced concrete frame beam according to claim 5 is characterized in that: Steel bar sleeves (10) are installed between a plurality of the frame beam longitudinal bars (103).

8. The joint between the steel tube concrete column and the staggered reinforced concrete frame beam according to claim 1, characterized in that: The cross fixing frame (2) comprises a center platform (21) and two telescopic rod bodies (23); a first height platform (22) is provided at the top of the center platform (21); a second height platform (27) is provided at the bottom of the center platform (21); a middle portion of the top of the center platform (21) and a middle portion of the bottom of the center platform (21) are respectively fixedly connected to the fixed ends of the two telescopic rod bodies (23); movable ends of the two telescopic rod bodies (23) are respectively fixedly connected to the middle portion of the bottom end of the first height platform (22) and the middle portion of the top end of the second height platform (27); fixed seats (29) are fixedly installed on both sides of the two telescopic rod bodies (23); connecting plates (26) are rotatably connected inside the four fixing seats (29); the ends of the four connecting plates (26) away from the fixing seats (29) are rotatably connected to the sliding seats (24); Each of the sliding seats (24) is slidably connected to the central platform (21); the middle parts of both sides of the two telescopic rod bodies (23) are rotatably connected with self-locking telescopic rods (28); the movable ends of the two self-locking telescopic rods (28) are rotatably connected to the middle parts of four connecting plates (26); springs (25) are fixedly installed on the surfaces of the four connecting plates (26); the ends of the four springs (25) away from the connecting plates (26) are fixedly connected to the side directly opposite to the central platform (21); the vertical distance between the first height platform (22) and the central platform (21) is equal to the beam width of the first staggered reinforced concrete beam (3); the vertical distance between the second height platform (27) and the central platform (21) is equal to the beam width of the second staggered reinforced concrete beam (7); and the interior of the central platform (21) is connected to the steel tube concrete column body (1).

9. The node of the steel tube concrete column and the staggered reinforced concrete frame beam according to claim 1, characterized in that: The first staggered reinforced concrete beam (3) and the second staggered reinforced concrete beam (7) both comprise a concrete frame (31) and a steel frame (32); the inner side of the concrete frame (31) is fixedly connected to the outer side of the steel frame (32); a plurality of beam bodies (34) extending to the outside are fixedly installed inside the steel frame (32); steel columns (33) are fixedly installed on both sides of the bottom end of the concrete frame (31); one side of the concrete frame (31) on the first staggered reinforced concrete beam (3) and one side of the concrete frame (31) on the second staggered reinforced concrete beam (7) are both connected to a cross fixing frame (2).

10. The construction method of the steel tube concrete column and staggered reinforced concrete frame beam node according to any one of claims 1 to 9, characterized in that: The following steps are involved: Step 1: Install the cross fixing frame (2): Install the cross fixing frame (2) on the outside of the steel tube concrete column body (1); Step 2, installing the first staggered reinforced concrete beam (3): installing the first staggered reinforced concrete beam (3) on one side of the cross fixing frame (2), and a first transition section exists at the connection between the two; Step 3: Reinforcement of the first transition section: Use the first steel corbel (4) and the shear studs (6) to reinforce the first transition section; Step 4: Install the second staggered reinforced concrete beam (7): Install the second staggered reinforced concrete beam (7) on one side of the cross fixing frame (2), and a second transition section exists at the connection between the two. Step 5: Reinforcement of the second transition section: Use the second steel corbel (9) and the shear studs (6) to reinforce the second transition section.

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