Steel reinforced concrete multi-beam intersection complex steel bar node structure

Abstract

The utility model discloses a complex steel bar node structure for steel reinforced concrete multi-beam intersection, which relates to the technical field of constructional engineering and comprises a steel reinforced concrete main beam, a mountain-shaped secondary beam, a connecting plate welded on an I-shaped steel rib web of the main beam, a haunching structure and self-compacting concrete. Longitudinal bars of the mountain-shaped secondary beams are regularly extended or bent into closed stirrups at intervals, anti-torsion steel bars are welded and fixed through connecting plate through holes, displacement of the steel bars of the haunching structures is adjusted through damping sliding grooves, self-compacting concrete is filled in a node core area, and common concrete is continuously poured on the periphery of the node core area. According to the structure, by optimizing steel bar arrangement, connecting plate standardized welding and layered pouring processes, the problems of steel bar conflict, complex welding and non-compact concrete of a traditional multi-beam intersection joint are solved, and the structure is suitable for a large-span complex building structure.

Description

Technical Field

[0001] This utility model relates to the field of building engineering technology, specifically to a complex steel-concrete composite beam intersecting reinforcement node structure. Background Technology

[0002] In reinforced concrete structures, the arrangement of reinforcing bars and the connection of steel sections at the intersection of multiple beams present construction challenges. Existing technologies, such as patent CN205224287U (Construction of Reinforcing Bar Nodes for Beams and Columns in Complex Reinforced Concrete Structures), employ a method of lapping reinforcing bars around the steel flanges, with non-continuous reinforcing bars cut off and welded to connecting plates. Another prior art document, "A Node Connection Structure for Increasing the Cross-Section of Concrete Beams" (CN221989974U), connects beams by fixing clamping plates with bolts, but this does not solve the problem of intersecting reinforcing bars at the intersection of multiple beams. Such technologies rely on on-site welding adjustments, resulting in a high rate of reinforcing bar collisions, and voids are easily formed during concrete pouring in areas with dense steel reinforcement.

[0003] Rebar collision: When multiple beams intersect, the longitudinal reinforcements are intertwined, and the traditional "bypassing the steel frame" method makes tying difficult and the rebar collision rate is high.

[0004] Welding is complex: anti-torsion steel bars need to be welded on-site, which has low precision and is easy to damage the steel frame.

[0005] Concrete defects: Ordinary concrete is difficult to compact in dense areas of the steel web, and voids are easily formed in the core area of ​​the joints, affecting the durability of the structure.

[0006] No effective solutions have yet been proposed to address the problems in the relevant technologies. Utility Model Content

[0007] In response to the problems in related technologies, this utility model proposes a complex steel-concrete composite multi-beam intersecting reinforcement node structure to overcome the aforementioned technical problems existing in the prior art.

[0008] Therefore, the specific technical solution adopted by this utility model is as follows:

[0009] A complex steel-concrete composite multi-beam intersecting reinforcement node structure includes a steel-concrete composite main beam with an I-shaped steel skeleton inside.

[0010] The secondary gable beam intersects with the main beam. The top and bottom longitudinal bars of the secondary gable beam extend to the main beam and the adjacent floor slab in an alternating manner. The ends of the unextended longitudinal bars are bent to form closed stirrups.

[0011] The connecting plate, welded to the web of the I-beam steel frame, is used to fix the anti-torsional steel bars of the mountain-shaped secondary beam;

[0012] Self-compacting concrete is used to fill the core area of ​​the intersection of the main beam and the mountain-shaped secondary beam, while ordinary concrete is used to pour the outer perimeter.

[0013] Furthermore, the top and bottom longitudinal bars of the mountain-shaped secondary beam have a bending angle of 90° and a bending length of not less than 12 times the diameter of the steel bar.

[0014] Furthermore, through holes are pre-drilled in the connecting plate, through which anti-torsion steel bars pass and are welded to both sides of the connecting plate. The welding positions are pre-marked using the BIM model.

[0015] Furthermore, a haunch structure is provided at the end of the mountain-shaped secondary beam. When the haunch angle is less than 171°, additional C25@200 reinforcing bars are added to the haunch area. The haunch structure includes a fixed plate, a damping groove, a haunch reinforcing bar, and a damping plate. The fixed plate is fixedly connected to the web of the I-beam. The damping plate is fixedly connected to one side of the mountain-shaped secondary beam. The damping groove is slidably connected to the damping plate. One end of the haunch reinforcing bar passes through the web of the I-beam and is fixedly welded to the fixed plate. The other end of the haunch reinforcing bar passes through the mountain-shaped secondary beam and is fixedly connected to the damping groove. The through-hole of the haunch reinforcing bar and the mountain-shaped secondary beam has a certain amount of room for movement.

[0016] Furthermore, L-shaped support plates are installed on both sides of the flange of the I-shaped steel frame. The support plates are fixed to the main beam with bolts and are used to permanently support the longitudinal reinforcement of the mountain-shaped secondary beam.

[0017] Furthermore, the anti-torsion reinforcement is centrally arranged within the height range of the I-shaped steel frame and fixed through web perforations or connecting plates, while the remaining anti-torsion reinforcement is arranged along both sides of the beam, avoiding the steel frame.

[0018] Furthermore, the strength grade of the self-compacting concrete is the same as that of the surrounding ordinary concrete. During pouring, a layered construction process is adopted, first completing the pouring of the self-compacting concrete in the core area of ​​the node, and then continuously pouring the surrounding ordinary concrete.

[0019] Furthermore, the web reinforcement of the mountain-shaped secondary beam is anchored by bent anchors, with the bent anchor length increased by 12 times the diameter of the steel bar, and avoiding the area of ​​the connecting plate. The maximum number of rows of web reinforcements does not exceed 12.

[0020] Steel main beam and mountain-shaped secondary beam structure: The main beam has an internal I-shaped steel frame, and the longitudinal reinforcement of the secondary beam is extended or bent into hoops according to the "every other one" rule, which simplifies the arrangement of steel bars;

[0021] Welding anti-torsion reinforcement to the connecting plate: Through pre-positioning using BIM, the anti-torsion reinforcement is welded through the through-hole of the connecting plate to improve the rigidity of the joint.

[0022] Haunch construction and damping groove: Haunch reinforcement is provided at the ends of the secondary beam to improve the tensile strength between the secondary beam and the main beam;

[0023] Self-compacting concrete is poured in layers: the core area is filled with self-compacting concrete, while the outer area is continuously constructed with ordinary concrete to ensure compaction.

[0024] The beneficial effects of this utility model are as follows: BIM pre-arrangement of steel bars reduces on-site adjustments, standardized welding of connecting plates reduces construction difficulty, anti-torsion steel bars are rigidly connected to the steel frame, the haunch structure disperses stress and improves seismic performance, self-compacting concrete avoids voids in the steel frame area, and layered pouring reduces cold joints. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the main structure of a complex steel-concrete composite multi-beam intersecting reinforcement node structure according to an embodiment of the present utility model;

[0027] Figure 2 This is a schematic diagram of the reinforcement arrangement of a complex steel-concrete multi-beam intersection reinforcement node structure according to an embodiment of the present utility model;

[0028] Figure 3 This is a schematic diagram of the connection between the I-shaped steel frame and the mountain-shaped secondary beam in a complex steel-concrete multi-beam intersection reinforcement node structure according to an embodiment of the present utility model;

[0029] Figure 4 This is a schematic diagram of a haunch structure for a complex steel-concrete composite multi-beam intersection reinforcement node according to an embodiment of the present utility model;

[0030] In the picture:

[0031] 1. Main beam; 2. I-beam steel frame; 201. Web; 202. Flange; 3. Mountain-shaped secondary beam; 301. Top longitudinal reinforcement; 302. Bottom longitudinal reinforcement; 4. Connecting plate; 401. Through hole; 5. Torsional reinforcement; 6. Self-compacting concrete; 7. Ordinary concrete; 8. Haunch construction; 801. Fixing plate; 802. Damping groove; 803. Haunch reinforcement; 804. Damping plate; 9. Reinforcing reinforcement; 10. L-shaped support plate; 11. Bolt; 12. Web reinforcement. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0033] According to an embodiment of the present invention, a complex steel reinforcement node structure with multiple intersecting steel-concrete composite beams is provided.

[0034] like Figure 1-4 As shown, the complex steel-concrete multi-beam intersection reinforcement node structure according to the embodiment of the present utility model includes a steel-concrete main beam 1, which is provided with an I-shaped steel frame 2 inside.

[0035] The mountain-shaped secondary beam 3 intersects with the main beam 1. The top longitudinal reinforcement 301 and the bottom longitudinal reinforcement 302 of the mountain-shaped secondary beam 3 extend to the main beam 1 and the adjacent floor slab in an alternating manner. The ends of the unextended longitudinal reinforcement are bent to form closed stirrups.

[0036] The connecting plate 4 is welded to the web 201 of the I-shaped steel frame 2 and is used to fix the anti-torsion steel bar 5 of the mountain-shaped secondary beam 3.

[0037] Self-compacting concrete 6 is used to fill the core area of ​​the intersection of the main beam 1 and the mountain-shaped secondary beam 3, while ordinary concrete 7 is used to pour the outer perimeter.

[0038] The top longitudinal reinforcement 301 and bottom longitudinal reinforcement 302 of the mountain-shaped secondary beam 3 have a bending angle of 90° and a bending length of not less than 12 times the diameter of the steel bar.

[0039] A through hole 401 is reserved on the connecting plate 4. The anti-torsion steel bar 5 passes through the through hole 401 and is welded to both sides of the connecting plate 4. The welding position is marked in advance by the BIM model.

[0040] A haunch structure 8 is provided at the end of the mountain-shaped secondary beam 3. When the haunch angle is less than 171°, a C25@200 reinforcing bar 9 is added to the haunch area. The haunch structure 8 includes a fixed plate 801, a damping groove 802, a haunch reinforcing bar 803, and a damping plate 804. The fixed plate 801 is fixedly connected to the web 201 of the I-shaped steel frame 2. The damping plate 804 is fixedly connected to one side of the mountain-shaped secondary beam 3. The damping groove 802 is dampingly slidably connected to the damping plate 804. One end of the haunch reinforcing bar 803 passes through the web 201 of the I-shaped steel frame 2 and is fixedly welded to the fixed plate 801. The other end of the haunch reinforcing bar 803 passes through the mountain-shaped secondary beam 3 and is fixedly connected to the damping groove 802. The through hole of the haunch reinforcing bar 803 and the mountain-shaped secondary beam 3 has a certain amount of room for movement.

[0041] L-shaped support plates 10 are provided on both sides of the flange 202 of the I-shaped steel frame 2. The support plates 10 are fixed to the main beam 1 by bolts 11 and are used to permanently support the longitudinal reinforcement of the mountain-shaped secondary beam 3.

[0042] The anti-torsion reinforcement 5 is arranged centrally within the height range of the I-shaped steel frame 2 and is fixed by the perforation of the web 201 or the connecting plate 4. The remaining anti-torsion reinforcement 5 is arranged along both sides of the beam, avoiding the steel frame.

[0043] The strength grade of the self-compacting concrete 6 is the same as that of the surrounding ordinary concrete 7. The pouring process adopts a layered construction process. First, the self-compacting concrete 6 in the core area of ​​the node is poured, and then the surrounding ordinary concrete 7 is poured continuously.

[0044] The web reinforcement 12 of the mountain-shaped secondary beam 3 is anchored by bent anchor. The length of the bent anchor is increased by 12 times the diameter of the steel bar and avoids the area of ​​the connecting plate 4. The maximum number of rows of web reinforcement 12 does not exceed 12.

[0045] Example 1: Construction of the intersection of multiple beams in a mountain-shaped tower

[0046] Main beam and steel frame installation

[0047] The main beam 1 has a cross section of 1950×800mm and an internal Q355B I-shaped steel frame 2. L-shaped support plates 10 are welded on both sides of the flange 202, and the template is fixed by bolts 11.

[0048] Secondary beam reinforcement arrangement

[0049] The top longitudinal reinforcement 301 and bottom longitudinal reinforcement 302 of the mountain-shaped secondary beam 3 extend to the main beam or floor slab according to the rule of "one every other". The ends of the unextended reinforcement bars are bent at 90° to form closed stirrups.

[0050] Torsion steel bar welding

[0051] The connecting plate 4 has a reserved Φ22 through hole 401. After the anti-torsion steel bar 5 passes through, it is double-sided fillet welded. The welding position is marked in advance by the BIM model.

[0052] Haunch construction

[0053] Install the haunch structure 8, the fixing plate 801 is welded to the web plate 201, one end of the haunch reinforcement 803 is welded to the fixing plate 801, and the other end passes through the reserved hole of the secondary beam and is connected to the damping groove 802, allowing ±5mm displacement, and C25@200 reinforcing steel bars 9 are tied in the haunch area.

[0054] Concrete pouring

[0055] Core area: C60 self-compacting concrete 6 is used, pumped from the bottom of the node upwards, and vibration is only used to assist flow.

[0056] Outer area: Pour C60 ordinary concrete 7 after 2 hours, and continue construction until completion.

[0057] Example 2: Optimization of lumbar muscles

[0058] The 3rd web reinforcement of the mountain-shaped secondary beam uses Φ16 steel bars, and the bending anchor length is increased by 12d to avoid the area of ​​the connecting plate 4. The number of web reinforcements does not exceed 12 to avoid conflict with the steel frame.

[0059] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A reinforced concrete multi-beam intersection complex reinforcement joint structure, characterized by, The steel-concrete composite girder (1) is internally provided with a H-shaped steel skeleton (2); The top longitudinal reinforcement (301) and the bottom longitudinal reinforcement (302) of the gable-shaped secondary beam (3) are extended into the main beam (1) and the adjacent floor in a staggered manner, and the ends of the longitudinal reinforcement not extended are bent to form closed stirrups; The connecting plate (4) is welded to the web (201) of the H-shaped steel skeleton (2) and is used for fixing the torsional reinforcement (5) of the gable-shaped secondary beam (3); The self-compacting concrete (6) is filled in the core area of the joint of the main beam (1) and the gable-shaped secondary beam (3), and the periphery is poured with ordinary concrete (7).

2. The multi-beam intersection complex steel reinforcement joint structure of a steel reinforced concrete according to claim 1, characterized in that, The bending angle of the top longitudinal reinforcement (301) and the bottom longitudinal reinforcement (302) of the gable-shaped secondary beam (3) is 90°, and the bending length is not less than 12 times the diameter of the reinforcement.

3. The multi-beam intersection complex steel reinforcement joint structure of a steel reinforced concrete according to claim 2, characterized in that, The connecting plate (4) is provided with a through hole (401), the torsional reinforcement (5) passes through the through hole (401) and is double-sided welded to the connecting plate (4), and the welding position is pre-marked by a BIM model.

4. The multi-beam intersection complex steel reinforcement joint structure of a steel reinforced concrete according to claim 3, characterized in that, The end of the gable-shaped secondary beam (3) is provided with a haunch structure (8), when the haunch angle is less than 171°, the haunch area is additionally provided with C25@200 reinforcing steel (9), and the haunch structure (8) comprises a fixing plate (801), a damping sliding groove (802), a haunch reinforcement (803) and a damping plate (804), the fixing plate (801) is fixedly connected with the web (201) of the H-shaped steel skeleton (2), the damping plate (804) is fixedly connected on one side of the gable-shaped secondary beam (3), the damping sliding groove (802) is slidingly connected on the damping plate (804), one end of the haunch reinforcement (803) is fixedly welded to the fixing plate (801) through the web (201) of the H-shaped steel skeleton (2), the other end of the haunch reinforcement (803) is fixedly connected with the damping sliding groove (802) through the gable-shaped secondary beam (3), and the haunch reinforcement (803) and the penetrating hole of the gable-shaped secondary beam (3) have a certain movement space.

5. The multi-beam intersection complex steel reinforcement joint structure of a steel reinforced concrete according to claim 1, characterized in that, L-shaped support plates (10) are arranged on both sides of the flange (202) of the H-shaped steel skeleton (2), the support plates (10) are fixed to the main beam (1) by bolts (11) and are used for permanently supporting the longitudinal reinforcement of the gable-shaped secondary beam (3).

6. The multi-beam intersection complex reinforced concrete joint structure of a steel reinforced concrete according to claim 5, characterized in that, The torsional reinforcement (5) is arranged in the middle of the height range of the H-shaped steel skeleton (2) and is fixed through the web (201) perforation or the connecting plate (4), and the remaining torsional reinforcement (5) is arranged along the two sides of the beam to avoid the steel skeleton.

7. The multi-beam intersection complex reinforced concrete joint structure of a steel reinforced concrete according to claim 6, characterized in that, The strength grade of the self-compacting concrete (6) is the same as that of the peripheral ordinary concrete (7), and a layered construction technology is adopted during pouring, the self-compacting concrete (6) in the core area of the joint is poured first, and then the continuous pouring of the peripheral ordinary concrete (7) is performed.

8. The multi-beam intersection complex reinforced concrete joint structure of a steel reinforced concrete according to claim 7, characterized in that, The waist reinforcement (12) of the gable-shaped secondary beam (3) is anchored by bending anchor, the length of the bending anchor is increased by 12 times the diameter of the reinforcement, and the waist reinforcement (12) avoids the connecting plate (4) area, and the maximum row number of the waist reinforcement (12) is not more than 12.

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