Joint connecting structure of steel tube concrete column and composite concrete beam and construction method

Abstract

The application discloses a node connecting structure of a steel pipe concrete column and a composite concrete beam, relates to the technical field of structural engineering, and comprises the steel pipe concrete column and the composite concrete beam. The composite concrete beam comprises a prefabricated part and a post-poured layer. A reinforcing cage is arranged at the post-poured layer. The reinforcing cage is formed with a splicing section near one end of the steel pipe concrete column. A connecting steel plate is horizontally arranged on one side of the steel pipe concrete column near the composite concrete beam. The end of the composite concrete beam is placed on the connecting steel plate. An opening is further arranged on one side of the steel pipe concrete column near the composite concrete beam. The opening is arranged in correspondence with the splicing section. The splicing section is inserted into the corresponding opening. The post-poured layer is integrally poured with the steel pipe concrete column. The application further discloses a construction method of the node connecting structure. The application can guarantee the reliable connection of the beam-column node and reduce the construction difficulty.

Description

Technical Field

[0001] This invention relates to the field of structural engineering technology, and in particular to a joint connection structure and construction method for a steel-concrete composite column and a composite concrete beam. Background Technology

[0002] With the development of modern construction and industrialization, urban buildings are becoming increasingly numerous. In common high-rise and large-span buildings, concrete and steel structures are frequently used together as load-bearing structures. In structural design, steel pipe columns are chosen for their high load-bearing capacity, good plasticity and toughness, and ease of construction; meanwhile, reinforced concrete beams are typically used to improve durability. However, in actual engineering projects, the connection methods used at the joints between steel pipe columns and reinforced concrete beams are quite complex and involve a large amount of work, significantly impacting the construction period and schedule.

[0003] Currently, common connection methods for steel pipe columns and reinforced concrete beams include: steel bracket type, ring beam type, bolt connection, and threaded sleeve connection. Among these, the steel bracket type consumes a large amount of steel, and the welding connection between the reinforcing bars and the steel column is cumbersome and involves a large amount of welding work on site. The ring beam type has a certain impact on the reliability of the internal force transmission between beams, and its complex structure also affects the building space. Bolted connections suffer from poor structural integrity due to the limited tightening force of the bolts themselves, and the bolts lack protection, making them prone to rusting or falling off when exposed to the outside for a long time, thus reducing the safety of existing node connections. The threaded sleeve connection is a mechanical connection where some of the reinforcing bars of the beam at the node are mechanically connected by welding straight threaded sleeves to the steel column. However, when welding the straight threaded sleeves to the steel column, the heat generated at the welding point can cause the threads of the straight threaded sleeves to deform, making it difficult to screw the ends of the reinforcing bars into the straight threaded sleeves during installation.

[0004] It is evident that the existing connection methods described above all suffer from construction difficulties or cannot guarantee reliability. Therefore, how to provide a joint structure for steel pipe columns and reinforced concrete beams that is easy to construct and has reliable connections is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] The purpose of this invention is to provide a joint connection structure and construction method for steel-concrete composite columns and composite concrete beams, so as to solve the problems existing in the prior art and reduce the construction difficulty while ensuring the reliability of the beam-column joint connection.

[0006] To achieve the above objectives, the present invention provides the following solution:

[0007] This invention provides a joint connection structure for a steel-concrete composite column and a composite concrete beam, comprising a steel-concrete composite column and a composite concrete beam. The composite concrete beam includes a precast section and a post-cast layer. A reinforcing steel cage is provided at the post-cast layer, and an insertion section is formed at one end of the reinforcing steel cage near the steel-concrete composite column. A connecting steel plate is horizontally provided on the side of the steel-concrete composite column near the composite concrete beam, and the end of the composite concrete beam rests on the connecting steel plate. An opening is also provided on the side of the steel-concrete composite column near the composite concrete beam, and the opening corresponds to the insertion section. The insertion section is inserted into the corresponding opening, and the post-cast layer is integrally cast with the steel-concrete composite column.

[0008] Preferably, the precast section has multiple lower reinforcing bars arranged longitudinally, and the reinforcing bar skeleton includes stirrups and multiple upper reinforcing bars arranged longitudinally. The bottom of the stirrups is connected to the lower reinforcing bars, and the top is connected to the upper reinforcing bars; wherein, multiple stirrups are arranged side by side longitudinally.

[0009] Preferably, the end of the upper reinforcing bar near the steel-concrete composite column is bent downward to form the splice section.

[0010] Preferably, an L-shaped steel plate is provided at one end of the composite concrete beam near the steel pipe concrete column. The L-shaped steel plate is welded to the lower reinforcing bar, and the vertical part of the L-shaped steel plate is flush with the end face of the composite concrete beam. The bottom surface of the horizontal part of the L-shaped steel plate is welded to the connecting steel plate, and the bottom surface of the connecting steel plate is flush with the bottom surface of the composite concrete beam.

[0011] Preferably, the connecting steel plate is provided with stiffening ribs vertically, the stiffening ribs extend longitudinally along the composite concrete beam, and the end of the composite concrete beam near the steel pipe concrete column is provided with a slot, the slot being provided corresponding to the stiffening ribs for the stiffening ribs to extend into.

[0012] Preferably, a stiffening plate assembly is also provided on the outer wall of the steel-concrete composite column near the opening. The stiffening plate assembly includes a horizontal stiffening plate and a vertical stiffening plate. The vertical stiffening plate is provided between adjacent openings. The top of all the vertical stiffening plates is connected by a horizontal stiffening plate, and the bottom of all the vertical stiffening plates is connected by a horizontal stiffening plate.

[0013] Preferably, a stiffening plate assembly is also provided on the steel-concrete composite column near the opening. The stiffening plate assembly includes a transverse stiffening plate and a vertical stiffening plate located on the outside of the steel-concrete composite column. The vertical stiffening plate is provided between adjacent openings, and a transverse stiffening plate is provided at the top and bottom of any vertical stiffening plate.

[0014] The stiffening plate assembly also includes an internal stiffening plate horizontally disposed within the steel-concrete composite column. The internal stiffening plate is matched with the steel pipe of the steel-concrete composite column and welded to the inner wall of the steel pipe. A pouring hole is provided in the middle of the internal stiffening plate for pouring concrete.

[0015] Preferably, the edge of the internal stiffening plate is provided with a plurality of ventilation holes evenly distributed.

[0016] Preferably, the steel tube of the steel-concrete composite column is a rectangular steel tube.

[0017] This invention also discloses a construction method for the joint connection structure of the steel-concrete composite column and the composite concrete beam as described above, comprising the following steps:

[0018] S1. Hoist the composite concrete beam to the designated position and place one end of the composite concrete beam near the steel pipe concrete column on the connecting steel plate;

[0019] S2. Pass the plug section through the corresponding opening and extend it into the steel-concrete composite column;

[0020] S3. Tie and fix the steel reinforcement cage;

[0021] S4. Cast the post-cast layer of the composite concrete beam and the steel-concrete composite column as a whole.

[0022] The present invention achieves the following technical effects compared to the prior art:

[0023] In this invention, the steel-concrete composite column is integrally cast with the composite concrete beam through a pre-reserved opening to form a beam-column joint. This method is reliable and can effectively transfer the bending moment, shear force, and axial force at the connection between the composite concrete beam and the steel-concrete composite column. While ensuring the bending and shear bearing capacity of the beam-column joint, it reduces the construction difficulty, makes the construction operation simpler, and improves the construction efficiency.

[0024] Moreover, the beam-column joint of this invention is integrally cast, forming a reliable beam-column joint. This overcomes the problems of large workload, unreliable welding quality, and cumbersome construction in traditional connection methods for longitudinal steel bars in composite concrete beams. It effectively reduces the difficulty of on-site construction, ensures reliable connection of the joint, stable construction quality, and more convenient construction.

[0025] The node connection structure described above in this invention overcomes the problems of bolts being exposed to the outside for a long time in traditional connection methods, which are prone to corrosion and falling off, reducing the tightness of existing connection nodes. Moreover, it is convenient to construct on site, ensures quality, and saves costs.

[0026] The node connection structure of the present invention involves extending the upper reinforcing bars of the composite concrete beam into the steel-concrete composite column through an opening, which reduces steel consumption and saves costs. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a perspective view of the first node connection structure in an embodiment of the present invention;

[0029] Figure 2 for Figure 1 The front view;

[0030] Figure 3 This is a perspective view of the second node connection structure in an embodiment of the present invention;

[0031] Figure 4 This is a schematic diagram showing the L-shaped steel plate, trapezoidal stiffening ribs, and connecting steel plate in an embodiment of the present invention.

[0032] In the diagram: 1-concrete composite steel tube column, 2-insertion joint, 3-upper reinforcement, 4-stirrups, 5-composite concrete beam, 6-L-shaped steel plate, 7-trapezoidal stiffening rib, 8-connecting steel plate, 9-opening, 10-slot, 11-transverse stiffening plate, 12-vertical stiffening plate, 13-lower reinforcement. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] The purpose of this invention is to provide a joint connection structure and construction method for steel-concrete composite columns and composite concrete beams, so as to solve the problems existing in the prior art and reduce the construction difficulty while ensuring the reliability of the beam-column joint connection.

[0035] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0036] Example 1

[0037] like Figures 1-4 As shown, this embodiment provides a node connection structure for a steel-concrete composite column and a composite concrete beam, mainly including a steel-concrete composite column 1 and a composite concrete beam 5. The composite concrete beam 5 includes a precast part and a post-cast layer. A steel reinforcement cage is provided at the post-cast layer. An insertion section 2 is formed at one end of the steel reinforcement cage near the steel-concrete composite column 1. A connecting steel plate 8 is horizontally provided on one side of the steel-concrete composite column 1 near the composite concrete beam 5. The end of the composite concrete beam 5 rests on the connecting steel plate 8 and is welded. An opening 9 is also provided on one side of the steel-concrete composite column 1 near the composite concrete beam 5. The opening 9 is correspondingly provided with the insertion section 2. The insertion section 2 is inserted into the corresponding opening 9, and the post-cast layer is integrally cast with the steel-concrete composite column 1.

[0038] In this embodiment, the steel-concrete composite column 1 is integrally cast with the composite concrete beam 5 through the reserved opening 9 to form a beam-column joint. The quality is reliable and it can effectively transfer the bending moment, shear force and axial force at the connection joint between the composite concrete beam 5 and the steel-concrete composite column 1. While ensuring the bending and shear bearing capacity of the beam-column joint, the construction difficulty is reduced, the construction operation is simpler and the construction efficiency is higher.

[0039] In this embodiment, it should also be noted that, as Figure 1 and Figure 3 As shown, the precast part of the composite concrete beam 5 is the lower part of the beam body, and the post-cast layer is the upper part of the beam body and the connection part with the steel-concrete composite column 1. The steel-concrete composite column 1 includes a steel pipe, concrete is poured inside the steel pipe, and the connecting steel plate 8 is welded to the outer wall of the steel pipe.

[0040] In this embodiment, the bottom of the precast section is provided with multiple lower reinforcing bars 13 along the longitudinal direction. The reinforcing bar skeleton includes stirrups 4 and multiple upper reinforcing bars 3 arranged along the longitudinal direction. The bottom of the stirrups 4 is tied and fixed to the lower reinforcing bars 13, and the top is tied and fixed to the upper reinforcing bars 3. Multiple stirrups 4 are arranged side-by-side along the longitudinal direction to improve overall stability. Furthermore, it should be noted that in this embodiment, "longitudinal" refers to the length direction of the composite concrete beam 5.

[0041] In this embodiment, the upper reinforcing bar 3 is bent downward at one end near the steel-concrete composite column 1 to form the insertion section 2; the height of the opening 9 is set according to the actual situation, as long as the insertion section 2 can be inserted into the steel-concrete composite column 1. The width of the opening 9 is preferably 1.5d (d is the nominal diameter of the upper reinforcing bar 3).

[0042] In this embodiment, an L-shaped steel plate 6 is provided at one end of the composite concrete beam 5 near the steel-concrete composite column 1. The L-shaped steel plate 6 is welded to the lower reinforcing bar 13, and the vertical part of the L-shaped steel plate 6 is flush with the end face of the composite concrete beam 5 near the steel-concrete composite column 1. The bottom surface of the horizontal part of the L-shaped steel plate 6 is welded to the connecting steel plate 8, and the bottom surface of the connecting steel plate 8 is flush with the bottom surface of the composite concrete beam 5. In this embodiment, the welding of the L-shaped steel plate 6 to the connecting steel plate 8 achieves the support and fixation of the end of the composite concrete beam 5 on the connecting steel plate 8, wherein the support length is not less than 100mm.

[0043] In this embodiment, stiffening ribs are vertically welded on the connecting steel plate 8. The stiffening ribs extend longitudinally along the composite concrete beam 5. A slot 10 is provided at one end of the composite concrete beam 5 near the steel pipe concrete column 1. The slot 10 is correspondingly provided with the stiffening ribs for the stiffening ribs to extend into. Preferably, the stiffening ribs are trapezoidal stiffening ribs 7.

[0044] In this embodiment, the end of the composite concrete beam 5 closest to the steel pipe concrete column 1 is a trapezoidal part, the longitudinal length of the trapezoidal part is B, B should not be greater than the spacing between adjacent stirrups 4, the height of the slot 10 is H, which should be determined according to the beam shear resistance calculation, and the width of the slot 10 is the thickness of the trapezoidal stiffener 7 + 10mm.

[0045] In this embodiment, when reinforcing the upper steel bars 3 of the composite concrete beam 5, it is advisable to select steel bars with larger diameters to reduce the number of steel bars, thereby reducing the number of openings on the steel-concrete composite column 1; wherein, the number of upper steel bars 3 extending into the steel-concrete composite column 1 is not less than 2.

[0046] In this embodiment, according to the "Technical Specification for Prefabricated Concrete Structures", when composite concrete beam 5 is used, the thickness of the post-cast concrete composite layer of the frame beam should not be less than 150mm, and the thickness of the post-cast concrete composite layer of the secondary beam should not be less than 120mm.

[0047] In this embodiment, a stiffening plate assembly needs to be installed on the steel-concrete composite column 1 near the opening 9. The stiffening plate assembly can be installed in two ways: exposed or combined internal and external. Specifically:

[0048] like Figure 1 and Figure 2As shown, when an exposed stiffening plate assembly is used, the stiffening plate assembly is installed on the outer wall of the steel-concrete composite column 1 near the opening 9. The stiffening plate assembly includes a transverse stiffening plate 11 and a vertical stiffening plate 12. Vertical stiffening plates 12 are installed between adjacent openings 9, and transverse stiffening plates 11 are installed at the top and bottom of the openings 9. The tops of all the vertical stiffening plates 12 are connected by the top transverse stiffening plates 11, and the bottoms of all the vertical stiffening plates 12 are connected by the bottom... The transverse stiffening plate 11 of the part is connected, and both the transverse stiffening plate 11 and the vertical stiffening plate 12 are welded to the outer wall of the steel pipe of the steel-concrete composite column 1; in this embodiment, the length of the vertical stiffening plate 12 should not be less than the height dimension of the opening 9 + 40mm, the length of the transverse stiffening plate 11 should not be less than the larger value between the distance between the outer edges of the two outermost openings 9 + 40mm and the width of the composite concrete beam 5, and the width of the transverse stiffening plate 11 should not be greater than the width of the connecting steel plate 8.

[0049] like Figure 3 As shown, when using an internal and external combined stiffening plate assembly, the stiffening plate assembly includes a transverse stiffening plate 11 and a vertical stiffening plate 12 installed on the outer wall of the steel-concrete composite column 1 near the opening 9, and an internal stiffening plate horizontally installed inside the steel-concrete composite column 1; wherein, a vertical stiffening plate 12 is installed between adjacent openings 9, and a transverse stiffening plate 11 is installed at the top and bottom of any vertical stiffening plate 12; both the transverse stiffening plate 11 and the vertical stiffening plate 12 are welded to the outer wall of the steel pipe of the steel-concrete composite column 1; the length of the vertical stiffening plate 12 should not be less than the height of the opening 9 + 40mm; and the length of the transverse stiffening plate 11 installed at the top and bottom of the opening 9 does not exceed the distance between adjacent openings 9.

[0050] The inner top and bottom of the opening are provided with internal stiffening plates. The shape and size of the internal stiffening plates match the steel pipe of the steel-concrete composite column 1. The internal stiffening plates are welded to the inner wall of the steel pipe. A circular pouring hole is provided in the middle of the internal stiffening plate for pouring concrete. Furthermore, multiple ventilation holes are evenly provided on the edge of the internal stiffening plate for ventilation during concrete pouring. The ventilation holes are also circular holes with a preferred diameter of 20mm.

[0051] In this embodiment, the steel pipe of the steel-concrete composite column 1 is a rectangular steel pipe, preferably a square pipe; at this time, the diameter of the pouring hole is half the side length of the internal stiffening plate, and a vent hole is provided at each of the four corners of the internal stiffening plate.

[0052] This embodiment also discloses a construction method for the joint connection structure of the steel tube concrete column and the composite concrete beam as described above, which mainly includes the following steps:

[0053] S1. Hoist the composite concrete beam 5 to the designated position, and place the end of the composite concrete beam 5 near the steel pipe concrete column 1 on the connecting steel plate 8, that is, weld the L-shaped steel plate 6 to the connecting steel plate 8.

[0054] S2. Bend the end of the upper steel bar 3 of the composite concrete beam 5 downward to form a splice section 2, and pass the splice section 2 through the corresponding opening 9 to extend into the steel pipe concrete column 1.

[0055] S3. Tie the upper steel bars 3 and stirrups 4 on site to form the steel reinforcement skeleton;

[0056] S4. The formwork and supports for the formwork beam, the pouring of the post-cast layer of the composite concrete beam 5 and the concrete of the steel pipe concrete column 1 (which can be concrete of the same or different grades), forming an integral joint connection structure between the steel pipe concrete column and the composite concrete beam.

[0057] Furthermore, some preparatory work can be done before step S1, specifically including:

[0058] S101. Opening 9 into the steel-concrete composite column 1 at the factory;

[0059] S102. Weld stiffening plate assemblies between the openings 9, weld connecting steel plates 8 on the side of the steel pipe concrete column 1 near the composite concrete beam 5, and weld trapezoidal stiffening ribs 7 on the connecting steel plates 8.

[0060] S103. Weld L-shaped steel plates 6 to the ends of the lower reinforcing bars 13 of the composite concrete beam 5, and cast the precast part of the composite concrete beam 5.

[0061] S104. The steel-concrete composite column 1 with the opening 9 is transported to the construction site, hoisted to the designated position, and fixed after being in place.

[0062] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A joint connection structure between a steel-concrete composite column and a composite concrete beam, characterized in that: The system includes a steel-concrete composite column and a composite concrete beam. The composite concrete beam includes a precast section and a post-cast layer. A reinforcing steel cage is provided in the post-cast layer. An insertion section is formed at one end of the reinforcing steel cage near the steel-concrete composite column. A connecting steel plate is horizontally provided on the side of the steel-concrete composite column near the composite concrete beam. The end of the composite concrete beam rests on the connecting steel plate. An opening is also provided on the side of the steel-concrete composite column near the composite concrete beam. The opening corresponds to the insertion section, which is inserted into the corresponding opening. The post-cast layer is integrally cast with the steel-concrete composite column. The precast section has multiple lower reinforcing bars arranged longitudinally. An L-shaped steel plate is provided at one end of the composite concrete beam near the steel pipe concrete column. The L-shaped steel plate is welded to the lower reinforcing bars, and the vertical part of the L-shaped steel plate is flush with the end face of the composite concrete beam. The bottom surface of the horizontal part of the L-shaped steel plate is welded to the connecting steel plate, and the bottom surface of the connecting steel plate is flush with the bottom surface of the composite concrete beam. The connecting steel plate is vertically provided with stiffening ribs that extend longitudinally along the composite concrete beam. The end of the composite concrete beam near the steel pipe concrete column is provided with a slot that corresponds to the stiffening rib and is used for the stiffening rib to extend into.

2. The joint connection structure between the steel-concrete composite column and the composite concrete beam according to claim 1, characterized in that: The steel reinforcement cage includes stirrups and multiple upper steel bars arranged longitudinally. The bottom of the stirrups is connected to the lower steel bars, and the top is connected to the upper steel bars. Multiple stirrups are arranged side by side longitudinally.

3. The joint connection structure between the steel-concrete composite column and the composite concrete beam according to claim 2, characterized in that: The upper reinforcing bar is bent downward at one end near the steel-concrete composite column to form the splice section.

4. The joint connection structure between a steel-concrete composite column and a composite concrete beam according to any one of claims 1-3, characterized in that: A stiffening plate assembly is also provided on the outer wall of the steel-concrete composite column near the opening. The stiffening plate assembly includes a horizontal stiffening plate and a vertical stiffening plate. The vertical stiffening plate is provided between adjacent openings. The top of all the vertical stiffening plates is connected by a horizontal stiffening plate, and the bottom of all the vertical stiffening plates is connected by a horizontal stiffening plate.

5. The joint connection structure between a steel-concrete composite column and a composite concrete beam according to any one of claims 1-3, characterized in that: A stiffening plate assembly is also provided on the steel-concrete composite column near the opening. The stiffening plate assembly includes a transverse stiffening plate and a vertical stiffening plate located on the outside of the steel-concrete composite column. The vertical stiffening plate is provided between adjacent openings, and a transverse stiffening plate is provided at the top and bottom of any vertical stiffening plate. The stiffening plate assembly also includes an internal stiffening plate horizontally disposed within the steel-concrete composite column. The internal stiffening plate is matched with the steel pipe of the steel-concrete composite column and welded to the inner wall of the steel pipe. A pouring hole is provided in the middle of the internal stiffening plate for pouring concrete.

6. The joint connection structure between the steel-concrete composite column and the composite concrete beam according to claim 5, characterized in that: The edge of the internal stiffening plate is evenly provided with multiple ventilation holes.

7. The joint connection structure between the steel-concrete composite column and the composite concrete beam according to claim 1, characterized in that: The steel tubes of the steel-concrete composite column are rectangular steel tubes.

8. A construction method for a joint connection structure between a steel-concrete composite column and a composite concrete beam as described in any one of claims 1-7, characterized in that: Includes the following steps: S1. Hoist the composite concrete beam to the designated position and place one end of the composite concrete beam near the steel pipe concrete column on the connecting steel plate; S2. Pass the plug section through the corresponding opening and extend it into the steel-concrete composite column; S3. Tie and fix the steel reinforcement cage; S4. Cast the post-cast layer of the composite concrete beam and the steel-concrete composite column as a whole.

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