Connecting structure of steel pipe column and reinforced concrete beam for large-burial-depth underground structure

Abstract

The invention discloses a connecting structure of a steel pipe column and a reinforced concrete beam for a large-burial-depth underground structure, which relates to the technical field of building construction and comprises the steps of arranging cross beams around the steel pipe column, connecting tension and compression steel bars at the end of a frame beam with nodes, arranging haunch angles between the frame beam and the cross beams, and mutually anchoring the cross beam steel bars around the nodes of the steel pipe column. Anchoring length needs to be met, the stress area of a beam steel bar needs to be larger than or equal to the area of a steel pipe column cut-off frame beam steel bar, haunch angles need to be arranged at the connecting positions of the beam and the frame beam, steel bars and dense stirrups need to be arranged along the haunch angles, and the beam is provided with waist bars and stirrups meeting standard requirements. Frame beam tension side main reinforcements need to be welded on the steel pipe column tensile ring plate when the steel pipe column is cut off, the welding length meets the standard requirement, frame beam compression side reinforcements can be directly anchored into the cross beam, and inclined connecting reinforcements are arranged at four corners of the joint of the cross beam and the steel pipe column; the steel pipe column-reinforced concrete beam node steel bar binding speed can be increased, and the construction efficiency is greatly improved.

Description

Technical Field

[0001] The invention relates to the technical field of building construction, and in particular to a connection structure between a steel pipe column and a reinforced concrete beam used in an underground structure with a large burial depth. Background Art

[0002] In deep underground structures, steel pipe columns are widely used in places with high bottom water pressure due to their excellent bearing capacity and stability. However, as the bottom water pressure increases, the cross-sectional size of the longitudinal beam also increases accordingly, resulting in the need to design a larger diameter connection node at the connection between the longitudinal beam and the steel pipe column. The traditional connection method usually uses a concrete ring beam to connect the steel pipe column and the longitudinal beam, but this design has some problems.

[0003] First, if concrete ring beams are used to connect nodes, a large number of ring bars need to be set up in the nodes, which not only increases the difficulty of steel bar binding, but also prolongs the construction period. Moreover, the complex configuration of the ring bars makes on-site construction operations more cumbersome and the control of the surrounding environment becomes more difficult. Secondly, the traditional connection structure may extend the foundation pit construction time due to the complex steel bar binding and long construction period, thereby increasing the project risk.

[0004] Therefore, how to simplify the construction process of the connection node between steel pipe columns and reinforced concrete beams, improve construction efficiency, and ensure the strength and stability of the node has become a technical problem that needs to be solved urgently. Summary of the invention

[0005] In response to the above technical problems, the present invention discloses a connection structure between a steel pipe column and a reinforced concrete beam for a deep underground structure, comprising a steel pipe column, on which a tension ring plate is installed, a node cross beam is arranged above the tension ring plate, the node cross beam is connected to the steel pipe column, both ends of the node cross beam are respectively connected to a node external frame beam, and an armpit angle is arranged at the connection between the node cross beam and the node external frame beam.

[0006] Furthermore, a plurality of reinforcing steel bars and a plurality of denser stirrups are arranged in the armpit corners, the plurality of reinforcing steel bars are evenly distributed, the plurality of denser stirrups are evenly distributed, and the denser stirrups are connected to the reinforcing steel bars.

[0007] Furthermore, two through steel bars are respectively arranged on both sides of the outer frame beam near the node, and the through steel bars directly penetrate the node. A cut-off steel bar is arranged in the middle of the outer frame beam of the node, and the cut-off steel bar is cut off by a steel pipe column. A tension ring plate is welded at the cut-off position of the cut-off steel bar, and a weld is arranged at the welding point between the cut-off steel bar and the tension ring plate.

[0008] Furthermore, a steel bar at the cutoff point of the steel pipe column is anchored at one end of the node beam away from the tension ring plate, a plurality of symmetrically distributed main beam bars are arranged in the node beam, the plurality of symmetrically distributed main beam bars are anchored near the upper and lower ends of the node beam, a plurality of beam stirrups are installed in the node beam, and the plurality of beam stirrups are evenly arranged around the outer circle of the steel pipe column.

[0009] Furthermore, the width of the node crossbeam is not less than the diameter of the steel pipe column, and the cross-sectional area of ​​the main reinforcement of the crossbeam is not less than the cross-sectional area of ​​the reinforcement at the cutoff point.

[0010] Furthermore, a plurality of oblique reinforcing bars are arranged around the steel pipe column in the node cross beam, the plurality of oblique reinforcing bars are evenly distributed, and every two of the oblique reinforcing bars are connected.

[0011] Furthermore, beam waist reinforcement is arranged in the node beam in accordance with the specification requirements, the beam waist reinforcement needs to meet the anchorage length, and a shear steel plate is arranged in the node beam, and the shear steel plate is connected to the steel pipe column.

[0012] Compared with the prior art, the present invention has the following beneficial effects: (1) simplifying the construction process and improving the construction efficiency: by setting a crossbeam around the steel pipe column to replace the traditional concrete ring beam design, the difficulty of steel bar binding is significantly simplified, the complexity of the construction process is reduced, thereby effectively shortening the construction period and improving the overall construction efficiency;

[0013] (2) Enhance node strength and optimize structural stability: By setting a crossbeam at the connection between the steel tube column and the reinforced concrete beam, the strength and stability of the connection node are enhanced, the bearing capacity of the structure is improved, and the structural weaknesses caused by the traditional ring beam design are avoided, ensuring the long-term stability of the structure;

[0014] (3) Reduce construction risks and ensure project safety: By accelerating the construction progress, especially by quickly completing the closure of the foundation pit floor, it is possible to effectively reduce the environmental risks that may arise during the construction process, reduce the safety hazards caused by the exposure of the foundation pit, and improve the overall safety and controllability of the project. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall planar structure of the present invention.

[0016] Figure 2 It is a schematic diagram of the overall elevation structure of the present invention.

[0017] Figure numbers: 1-steel pipe column; 2-node cross beam; 3-node external frame beam; 4-axillary angle; 5-through steel bar; 6-steel bar at cutoff; 7-tension ring plate; 8-cross beam stirrups; 9-reinforced steel bar; 10-densified stirrups; 11-reinforced diagonal bars; 12-weld; 13-cross beam main bars; 14-shear steel plate; 15-cross beam waist bars. DETAILED DESCRIPTION

[0018] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0019] The following describes the design principle of the connection structure between a steel pipe column and a reinforced concrete beam for a deep underground structure of the present invention in conjunction with the accompanying drawings. The steel bars in the drawings are only for illustration and the specific steel bar configuration is carried out in combination with actual conditions.

[0020] Example: Figure 1 , Figure 2 As shown, a connection structure of a steel pipe column and a reinforced concrete beam for a deep underground structure comprises a steel pipe column 1, a tensile ring plate 7 is installed on the steel pipe column 1, a node cross beam 2 is arranged above the tensile ring plate 7, the node cross beam 2 is connected to the steel pipe column 1, and both ends of the node cross beam 2 are respectively connected to a node outer frame beam 3, and the internal force of the end of the node outer frame beam 3 is transmitted through the tensile ring plate 7 and the node cross beam 2 on the steel pipe column 1. When the node outer frame beam 3 is subjected to tension at the node where the steel pipe column 1 intersects with the node outer frame beam 3, the through steel bars 5 on both sides of the node outer frame beam 3 are subjected to normal force. In order to avoid stress concentration at the connection between the node outer frame beam 3 and the node cross beam 2, an armpit angle 4 is arranged at the connection between the node cross beam 2 and the node outer frame beam 3, and a plurality of reinforcing steel bars 9 and a plurality of dense stirrups 1 are arranged in the armpit angle 4. 0, multiple reinforcing steel bars 9 are evenly distributed, multiple dense stirrups 10 are evenly distributed, and the dense stirrups 10 are connected to the reinforcing steel bars 9. In order to make the connection between the node cross beams 2 tighter, multiple reinforcing oblique bars 11 are arranged around the steel pipe column 1 in the node cross beam 2. Multiple reinforcing oblique bars 11 are evenly distributed, and every two reinforcing oblique bars 11 are connected. Two through steel bars 5 are respectively arranged on both sides of the outer frame beam 3 near the node. The through steel bars 5 directly penetrate the node. A truncation steel bar 6 is arranged in the middle part of the outer frame beam 3 of the node. The truncation steel bar 6 is truncated by the steel pipe column 1. A tensile ring plate 7 is welded at the position where the truncation steel bar 6 is truncated. The truncation steel bar 6 and the tensile ring plate 7 are double-sided welded. A weld 12 is arranged at the welding point between the truncation steel bar 6 and the tensile ring plate 7, and the length of the weld 12 is not less than five d.

[0021] A steel bar 6 at the cutoff point of the steel pipe column 1 is anchored at one end of the node cross beam 2 away from the tension ring plate 7, a plurality of symmetrically distributed cross beam main bars 13 are arranged in the node cross beam 2, and the plurality of symmetrically distributed cross beam main bars 13 are anchored at the upper and lower ends near the node cross beam 2, a plurality of cross beam stirrups 8 are installed in the node cross beam 2, and the plurality of cross beam stirrups 8 are evenly arranged around the outer circle of the steel pipe column 1, the width of the node cross beam 2 is not less than the diameter of the steel pipe column 1, and the cross-sectional area of ​​the cross beam main bars 13 is not less than the cross beam main bars 13 at the cutoff point. 6, a beam waist reinforcement 15 is arranged vertically in the cross section of the node beam 2 in accordance with the specification requirements, and the beam waist reinforcement 15 needs to meet the anchorage length. A shear steel plate 14 is arranged in the node beam 2, and the shear steel plate 14 is connected to the steel pipe column 1. In order to ensure the design concept of a stronger node in the beam-column system, when there are more steel bars 6 at the cutoff point, four sets of node beams 2 are added when the welding quality and welding thickness cannot be guaranteed, and the main beam reinforcement 13 is used to anchor each other to transfer the tension generated by the frame beam 3 outside the node.

[0022] In the description of this specification, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0023] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0024] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A connection structure between a steel pipe column and a reinforced concrete beam for a deep underground structure, characterized in that: The invention comprises a steel pipe column (1), wherein a tension ring plate (7) is installed on the steel pipe column (1), a node cross beam (2) is arranged above the tension ring plate (7), the node cross beam (2) is connected to the steel pipe column (1), both ends of the node cross beam (2) are respectively connected to a node external frame beam (3), and an armpit angle (4) is arranged at the connection between the node cross beam (2) and the node external frame beam (3).

2. The connection structure of a steel pipe column and a reinforced concrete beam for a deep underground structure according to claim 1, characterized in that: A plurality of reinforcing steel bars (9) and a plurality of denser stirrups (10) are arranged in the axilla corners (4); the plurality of reinforcing steel bars (9) are evenly distributed; the plurality of denser stirrups (10) are evenly distributed; and the denser stirrups (10) and reinforcing steel bars (9) are connected.

3. The connection structure of a steel pipe column and a reinforced concrete beam for a deep underground structure as claimed in claim 2, characterized in that: Two through steel bars (5) are respectively arranged on both sides of the outer frame beam (3) near the node, and the through steel bars (5) directly penetrate the node. A cut-off steel bar (6) is arranged in the middle of the outer frame beam (3) of the node, and the cut-off steel bar (6) is cut off by the steel pipe column (1). A tension ring plate (7) is welded at the cut-off position of the cut-off steel bar (6), and a weld (12) is arranged at the welding point between the cut-off steel bar (6) and the tension ring plate (7).

4. The connection structure of a steel pipe column and a reinforced concrete beam for a deep underground structure as claimed in claim 3, characterized in that: A steel bar (6) at the cut-off point of the steel pipe column (1) is anchored at one end of the node crossbeam (2) away from the tension ring plate (7); a plurality of symmetrically distributed crossbeam main bars (13) are arranged in the node crossbeam (2); the plurality of symmetrically distributed crossbeam main bars (13) are anchored near the upper and lower ends of the node crossbeam (2); a plurality of crossbeam stirrups (8) are installed in the node crossbeam (2); the plurality of crossbeam stirrups (8) are evenly arranged around the outer circle of the steel pipe column (1).

5. The connection structure of a steel pipe column and a reinforced concrete beam for a deep underground structure as claimed in claim 4, characterized in that: The width of the node cross beam (2) is not less than the diameter of the steel pipe column (1), and the cross-sectional area of ​​the main reinforcement (13) of the cross beam is not less than the cross-sectional area of ​​the reinforcement (6) at the cut-off point.

6. The connection structure of a steel pipe column and a reinforced concrete beam for a deep underground structure as claimed in claim 5, characterized in that: A plurality of reinforcing diagonal bars (11) are arranged around the steel pipe column (1) in the node cross beam (2); the plurality of reinforcing diagonal bars (11) are evenly distributed, and every two of the reinforcing diagonal bars (11) are connected.

7. The connection structure of a steel pipe column and a reinforced concrete beam for a deep underground structure according to claim 6, characterized in that: The node cross beam (2) is provided with a cross beam waist reinforcement (15) in accordance with the specification requirements, and the cross beam waist reinforcement (15) needs to meet the anchorage length. The node cross beam (2) is provided with a shear steel plate (14), and the shear steel plate (14) is connected to the steel pipe column (1).

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