Anti-micro-vibration fabricated beam-column connection joint structure

Abstract

The utility model discloses an anti-micro-vibration assembly type beam-column connection node structure which comprises a prefabricated frame column, wherein the prefabricated frame column comprises a prefabricated upper column and a prefabricated lower column; a connecting plate is pre-buried at the end part of the prefabricated frame beam, and upper and lower flanges of the connecting plate are respectively welded with longitudinal bars at the upper and lower ends in the beam; the ends, away from the joint core area, of the connecting plates are connected with embedded connecting steel plates. The joint core area is of a steel pipe concrete composite structure and is located at the joint of the prefabricated frame column and the prefabricated frame beam; according to the beam column connecting assembly, a prefabricated frame beam is fixedly connected with a connecting plate of a joint core area through a pre-buried connecting steel plate and high-strength bolts, and a gap between the beam end and the joint core area is filled with post-pouring concrete to form an overall stress structure. The rigidity of the connecting joint of the prefabricated column and the prefabricated beam is enhanced, the overall rigidity of the industrial factory building is improved, and the anti-micro-vibration control standard of the assembly type high-precision industrial factory building is met.

Description

Technical Field

[0001] This utility model relates to the fields of prefabricated building structures and anti-micro-vibration design technology, and in particular to an anti-micro-vibration prefabricated beam-column connection node structure. Background Technology

[0002] With the rapid development of prefabricated building technology, its application in high-precision buildings such as industrial plants and data centers is becoming increasingly widespread. However, traditional prefabricated beam-column connection nodes have significant shortcomings in terms of micro-vibration resistance. These types of buildings are extremely sensitive to micro-vibrations, especially in scenarios such as semiconductor manufacturing and precision instrument processing, where micro-vibrations can directly affect equipment operational stability and product yield.

[0003] Currently, most common prefabricated beam-column joints use pure reinforced concrete or steel-concrete composite structures, which have the following problems:

[0004] Insufficient node stiffness: Traditional nodes rely on steel bar lap splices or ordinary bolt connections, resulting in low stiffness in the core area of ​​the node. This makes it difficult to resist micro-vibrations caused by dynamic loads, causing the structure's natural frequency to approach the frequency of the external vibration source, which can easily lead to resonance.

[0005] Poor connection reliability: The mechanical connection or welding construction error of the steel bars of precast beams and columns is large, and cracks are prone to appear at the interface between the post-cast concrete and the precast components, which weakens the integrity and further reduces the vibration resistance.

[0006] Low construction efficiency: The core area of ​​the node has a complex structure, and the on-site steel reinforcement binding and concrete pouring take a long time, which makes it difficult to meet the requirements of rapid construction and precision control of high-precision factory buildings. Utility Model Content

[0007] The purpose of this invention is to provide a prefabricated beam-column connection node structure that is resistant to micro-vibration, thereby solving the aforementioned problems existing in the prior art.

[0008] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0009] A prefabricated beam-column connection node structure for diastolic vibration prevention includes:

[0010] Precast frame column: includes precast upper column and precast lower column, both of which are welded to the ends of a first square steel pipe. The first square steel pipe is welded to the longitudinal reinforcement inside the column to form a composite load-bearing column.

[0011] Precast frame beam: Its ends are pre-embedded with connecting plates. The upper and lower flanges of the connecting plates are welded to the upper and lower longitudinal reinforcements in the beam, respectively. The end of the connecting plate away from the core area of ​​the node is connected to a pre-embedded connecting steel plate.

[0012] The core area of ​​the node is a steel-concrete composite structure located at the connection between the precast frame columns and the precast frame beams. It is enclosed by the first square steel pipe in the core area located between the precast upper column and the precast lower column. The upper and lower ends of the first square steel pipe in the core area are respectively welded to the welded square steel pipe of the precast upper column and the welded square steel pipe of the precast lower column to form a continuous column structure.

[0013] Beam-column connection components: The precast frame beams are connected and fixed to the connection plates of the node core area by pre-embedded connecting steel plates and high-strength bolts. The gap between the beam ends and the node core area is filled with post-cast concrete to form an integral load-bearing structure.

[0014] In some specific embodiments, the first square steel pipes of the precast upper column and the precast lower column are welded to the first square steel pipes of the node core area using full penetration welds.

[0015] In some specific embodiments, the precast frame beams are made of reinforced concrete and are equipped with upper and lower longitudinal reinforcement bars arranged along the length of the beam.

[0016] The connection between the longitudinal reinforcement and the core area of ​​the node is designed as a bent structure.

[0017] In some specific embodiments, the angle of the longitudinal rib bending structure is 170°. 0 .

[0018] In some specific embodiments, four "U"-shaped pre-embedded ribs are welded to the inner side of the welded square steel pipe, and the openings of the "U"-shaped pre-embedded ribs are arranged symmetrically in pairs.

[0019] In some specific embodiments, an internal steel plate is also provided in the core area of ​​the node.

[0020] In some specific embodiments, the wall thickness of the welded square steel pipe is 8 to 12 mm.

[0021] The beneficial effects of this utility model are:

[0022] This utility model discloses a prefabricated beam-column connection node structure for preventing micro-vibration, including prefabricated frame columns (including prefabricated upper and lower columns); prefabricated frame beams with pre-embedded connecting plates at their ends, the upper and lower flanges of which are welded to the upper and lower longitudinal reinforcement bars inside the beam, and a pre-embedded connecting steel plate connected to the end of the connecting plate away from the node core area; the node core area, a steel-concrete composite structure, located at the connection between the prefabricated frame column and the prefabricated frame beam; and a beam-column connection assembly: the prefabricated frame beam is fixed to the connecting plate of the node core area via pre-embedded connecting steel plates and high-strength bolts, and the gap between the beam end and the node core area is filled with post-cast concrete to form an integral load-bearing structure. This utility model enhances the stiffness of the connection node between the prefabricated column and the prefabricated beam, improves the overall stiffness of the industrial plant, and meets the micro-vibration control standards for prefabricated high-precision industrial plants. It changes the dynamic characteristics of the structure, making the natural frequency of the structure avoid the frequency range of external vibration sources, reducing the occurrence of resonance phenomena. It improves the operational stability of equipment and the processing accuracy of products, reduces the defect rate, and thus improves production efficiency and product quality, increasing economic benefits. It will help promote technological progress in the field of anti-micro-vibration design for electronic industrial plants, and encourage the construction industry to continuously explore more advanced design concepts and construction technologies. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of a prefabricated beam-column connection node structure for preventing micro-vibration according to this utility model;

[0024] Figure 2 This is a structural schematic diagram of the welded square steel pipe of this utility model;

[0025] Figure 3 This is a schematic diagram of the structure of the node core area of ​​this utility model;

[0026] Figure 4 This is a structural schematic diagram of the prefabricated frame column of this utility model.

[0027] In the attached diagram, 1. Precast upper column; 11. Column longitudinal reinforcement; 12. Column stirrups; 13. End steel plate; 2. Precast lower column; 3. Welded square steel pipe; 4. Connecting plate; 5. Longitudinal reinforcement; 6. Embedded connecting steel plate; 7. Precast frame beam; 8. Precast steel plate. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the scope of the present utility model.

[0029] Reference Figures 1 to 4 The illustrated prefabricated beam-column connection node structure for diastolic vibration includes:

[0030] Precast frame column: includes precast upper column 1 and precast lower column 2, both of which are welded to the ends of a first square steel pipe. The first square steel pipe is welded to the longitudinal reinforcement inside the column to form a composite load-bearing column.

[0031] The first square steel pipe welded to the ends of the precast upper column 1 and the precast lower column 2 is welded together with the longitudinal reinforcement inside the column to form a composite load-bearing column. This design significantly enhances the overall stiffness and load-bearing performance of the column.

[0032] Precast frame beam: A connecting plate 4 is pre-embedded at its end. The upper and lower flanges of the connecting plate 4 are welded to the upper and lower longitudinal reinforcement 5 inside the beam, ensuring the robustness between the connecting plate and the precast frame beam. Furthermore, a pre-embedded connecting steel plate 6 is connected to the end of the connecting plate 4 furthest from the node core area; this connecting plate 4 is a key component connecting the precast frame beam and the node core area. This is in preparation for subsequent high-strength bolt connection with the node core area. It should also be noted that one end of the connecting plate 4 is connected to the pre-embedded steel plate with upper and lower flanges in the core area, while the other end is connected to the pre-embedded connecting steel plate 6 without upper and lower flanges at the end of the precast beam.

[0033] The core area of ​​the node is a steel-concrete composite structure located at the connection between the precast frame columns and the precast frame beams. It is formed by the first square steel pipe in the core area located between the precast upper column 1 and the precast lower column 2. The upper and lower ends of the first square steel pipe in the core area are respectively welded to the welded square steel pipe 3 of the precast upper column 1 and the welded square steel pipe 3 of the precast lower column 2 to form a continuous column structure, which greatly enhances the rigidity and stability of the core area of ​​the node.

[0034] Beam-column connection assembly: The precast frame beams are fixed to the connection plates in the node core area via pre-embedded connecting steel plates 6 and high-strength bolts. The gap between the beam ends and the node core area is filled with post-cast concrete to form an integral load-bearing structure. This connection method facilitates factory prefabrication and rapid on-site installation while ensuring construction accuracy and overall load-bearing performance.

[0035] In some specific embodiments, the first square steel pipes of the precast upper column 1 and the precast lower column 2 are welded to the first square steel pipe of the node core area using full penetration welds.

[0036] In some specific embodiments, the precast frame beam is made of reinforced concrete and is equipped with upper and lower longitudinal reinforcement bars 5, which are arranged along the length of the beam.

[0037] The connection end between the longitudinal reinforcement 5 and the core area of ​​the node is set as a bent structure.

[0038] In some specific embodiments, the angle of the longitudinal rib 5 bending structure is 170°. 0 .

[0039] Structural features of longitudinal reinforcement 5: Longitudinal reinforcement is divided into upper longitudinal reinforcement and lower longitudinal reinforcement.

[0040] Location and distribution: The upper longitudinal reinforcement is continuously arranged along the top surface of the beam and located below the concrete cover; the lower longitudinal reinforcement is continuously arranged along the bottom surface of the beam and located above the concrete cover. Together, they form the main load-bearing skeleton of the beam.

[0041] The longitudinal reinforcement extends from the beam end to the connection node and is welded and fixed to the pre-embedded connection plate to ensure that the load is transferred to the core area of ​​the node.

[0042] Connection method: Longitudinal reinforcement is mechanically connected or welded (such as sleeve extrusion or arc welding) in the mid-span area, and the connection position avoids the high stress area at the beam end (such as within the mid-span 1 / 3 range).

[0043] The longitudinal reinforcement at the beam end is connected to the pre-embedded connecting plate 4 by a full penetration weld, and the welding length meets the specification requirements.

[0044] Stress load: The upper longitudinal reinforcement mainly bears the tensile stress at the top of the beam when it is bent, while the lower longitudinal reinforcement bears the compressive stress at the bottom and part of the tensile stress, together resisting the bending moment and shear force of the beam.

[0045] Under vertical load, the upper longitudinal reinforcement at the beam ends bears negative bending moment, while the lower longitudinal reinforcement at the mid-span bears positive bending moment, forming a continuous force system.

[0046] In some specific embodiments, the inner side of the welded square steel pipe is welded with three rows of four "U" pre-embedded ribs in each row, and the openings of the "U" pre-embedded ribs are symmetrically arranged in pairs.

[0047] The structural characteristics of welded square steel pipes are mainly reflected in the following aspects:

[0048] High strength and stiffness: Due to its cross-sectional shape and the material of the steel, welded square steel pipes have high strength and stiffness, which can effectively enhance the overall load-bearing capacity and stability of prefabricated beam-column connection nodes.

[0049] Facilitates welding and assembly: The end design of the weldable square steel tube facilitates welding with the square steel tubes of the precast columns and the core area of ​​the node, ensuring the reliability and accuracy of the connection node.

[0050] Improved anti-micro-vibration performance: By reinforcing with welded square steel pipes, the stiffness of the prefabricated beam-column connection nodes is significantly improved, thereby changing the dynamic characteristics of the structure, reducing the occurrence of resonance, and meeting the anti-micro-vibration performance requirements of high-precision industrial plants.

[0051] Facilitates factory prefabrication and on-site installation: As part of prefabricated components, welded square steel pipes are easy to prefabricate in the factory and quickly install on-site, improving construction efficiency and accuracy.

[0052] In some specific embodiments, an internal steel plate is also provided in the core area of ​​the node.

[0053] In some specific embodiments, the wall thickness of the welded square steel pipe 3 is 8 to 12 mm.

[0054] I. Materials and Component Prefabrication

[0055] Material preparation

[0056] Steel: Q355B grade and above high-strength steel is selected. The wall thickness of the welded square steel pipe is selected as 8-12mm according to the design requirements. The thickness of the inner steel plate is matched with that of the square steel pipe.

[0057] Concrete: Precast frame columns and beams use C40 or higher strength grade concrete, and C50 micro-expansion concrete is used for post-cast concrete in the core area of ​​the joints.

[0058] Connectors: High-strength bolts (8.8 or 10.9 grade) and matching nuts and washers, full penetration welding rods (E50 type).

[0059] Precast frame column fabrication

[0060] Column forming: The precast upper column 1 and precast lower column 2 are cast using steel molds, and the longitudinal reinforcement inside the column is tied and fixed according to the design spacing.

[0061] Square steel pipe welding: Weld the first square steel pipe (wall thickness 8-12mm) to both ends of the precast column. Clean the weld joint and preheat before welding. After welding, perform ultrasonic flaw detection to ensure that there are no defects such as cracks and pores.

[0062] Composite column formation: The first square steel pipe is welded to the longitudinal reinforcement inside the column through a full penetration weld to form a composite load-bearing column.

[0063] Precast frame beam fabrication

[0064] Longitudinal reinforcement arrangement: The upper and lower longitudinal reinforcement 5 are arranged along the length of the beam, and the ends of the longitudinal reinforcement are bent at 170° to form a bent structure, with the bent part aligned with the flange of the connecting plate 4.

[0065] Pre-embedded connecting plate: Weld the upper and lower flanges of the connecting plate 4 to the longitudinal reinforcement 5 inside the beam, with a welding length ≥ 10d (d is the diameter of the longitudinal reinforcement), and the weld is full and free of slag inclusions.

[0066] Installation of pre-embedded connecting steel plate 6: The connecting plate 4 and the pre-embedded connecting steel plate 6 are connected by high-strength bolts.

[0067] Prefabricated core area of ​​nodes

[0068] Square steel tube enclosure: A first square steel tube in the core area is set between the precast upper column 1 and the precast lower column 2. Its upper and lower ends are respectively connected to the welded square steel tube 3 of the precast column through full penetration welds to form a continuous column structure.

[0069] Built-in steel plate installation: An internal steel plate is welded inside the square steel pipe in the core area to enhance the rigidity and shear resistance of the joint.

[0070] "U" Embedded Reinforcement Setting: Four "U" shaped embedded reinforcements are symmetrically welded inside the welded square steel pipe 3, with the opening directions facing each other in pairs, and the embedded reinforcements are anchored into the concrete to a depth of ≥100mm.

[0071] II. On-site construction steps

[0072] Precast component hoisting and positioning

[0073] The precast lower column 2 is hoisted to the design position and fixed with temporary supports, with a verticality deviation of ≤3mm.

[0074] Hoist the precast upper column 1 and align it with the lower column 2, and adjust the column axis deviation to ≤2mm.

[0075] Welding of the core area of ​​the node

[0076] The precast upper column 1 and precast lower column 2 are welded to the first square steel pipe in the core area using full penetration welds. After welding, magnetic particle testing is performed.

[0077] C50 micro-expansion concrete was poured inside the square steel pipe in the core area, compacted by vibration, and cured to the design strength.

[0078] Precast frame beam installation

[0079] The precast frame beam 7 is hoisted, and the pre-embedded connecting steel plate 6 at the beam end is temporarily fixed to the connecting plate 4 in the core area of ​​the node using high-strength bolts.

[0080] Adjust the beam axis deviation to ≤2mm, initially tighten the bolts to 70% of the design torque, and then retighten them to 100% torque.

[0081] Post-cast concrete construction

[0082] A formwork was erected in the gap between the beam end and the core area of ​​the node, C50 micro-expansion concrete was poured, and a vibrator was inserted to remove air bubbles.

[0083] After the concrete has set, remove the formwork and cover it with a damp cloth for 7 days to ensure a tight bond between the post-cast area and the precast component interface.

[0084] III. Quality Control and Acceptance

[0085] Weld inspection: Full penetration welds must pass ultrasonic testing (UT) and magnetic particle testing (MT), with a pass rate of 100%.

[0086] Bolted connections: After the high-strength bolts are finally tightened, a torque wrench is used for random checks, and the torque deviation is ≤±5%.

[0087] Concrete strength: The compressive strength of precast components and post-cast concrete test blocks must reach more than 115% of the design value.

[0088] Anti-vibration test: After construction is completed, vibration sensors are used to detect the natural frequency of the structure to ensure that it avoids the frequency range of external vibration sources (such as 5 to 50 Hz).

[0089] By adopting the above-disclosed technical solution of this utility model, the following beneficial effects are obtained:

[0090] This utility model discloses a prefabricated beam-column connection node structure for preventing micro-vibration, including a prefabricated frame column: composed of a prefabricated upper column and a prefabricated lower column; a prefabricated frame beam: with a connecting plate pre-embedded at its end, the upper and lower flanges of the connecting plate being welded to the upper and lower longitudinal reinforcements inside the beam, and a pre-embedded connecting steel plate connected to the end of the connecting plate away from the node core area; a node core area: a steel-concrete composite structure located at the connection between the prefabricated frame column and the prefabricated frame beam; and a beam-column connection assembly: the prefabricated frame beam is fixed to the connecting plate of the node core area by high-strength bolts through the pre-embedded connecting steel plate, and the gap between the beam end and the node core area is filled with post-cast concrete to form an integral load-bearing structure. This utility model enhances the stiffness of the connection node between the prefabricated column and the prefabricated beam, improves the overall stiffness of the industrial plant, and meets the micro-vibration control standards for prefabricated high-precision industrial plants. It changes the dynamic characteristics of the structure, making the natural frequency of the structure avoid the frequency range of external vibration sources, reducing the occurrence of resonance phenomena. It improves the operational stability of equipment and the processing accuracy of products, reduces the defect rate, and thus improves production efficiency and product quality, increasing economic benefits. It will help promote technological progress in the field of anti-micro-vibration design for electronic industrial plants, and encourage the construction industry to continuously explore more advanced design concepts and construction technologies.

[0091] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A prefabricated beam-column connection node structure for preventing micro-vibration, characterized in that, include: Precast frame column: including precast upper column (1) and precast lower column (2), both of which are welded to the ends with a first square steel pipe, and the first square steel pipe is welded to the longitudinal reinforcement inside the column to form a composite load-bearing column; Precast frame beam: A connecting plate (4) is pre-embedded at its end. The upper and lower flanges of the connecting plate (4) are respectively welded to the upper and lower longitudinal reinforcement (5) in the beam. A pre-embedded connecting steel plate (6) is connected to one end of the connecting plate (4) away from the core area of ​​the node. The core area of ​​the node is a steel-concrete composite structure located at the connection between the precast frame column and the precast frame beam. It is formed by the first square steel pipe in the core area between the precast upper column (1) and the precast lower column (2). The upper and lower ends of the first square steel pipe in the core area are respectively connected to the welded square steel pipe (3) of the precast upper column (1) and the welded square steel pipe (3) of the precast lower column (2) by welding to form a continuous column structure. Beam-column connection assembly: The precast frame beam is fixed to the connection plate of the node core area by pre-embedded connecting steel plate (6) and high-strength bolts. The gap between the beam end and the node core area is filled with post-poured concrete to form an integral load-bearing structure.

2. The anti-micro-vibration prefabricated beam-column connection node structure according to claim 1, characterized in that, The first square steel pipes of the precast upper column (1) and the precast lower column (2) are welded to the first square steel pipes of the node core area by full penetration weld.

3. The anti-micro-vibration prefabricated beam-column connection node structure according to claim 1, characterized in that, The precast frame beam is made of reinforced concrete and is equipped with upper and lower longitudinal bars (5) arranged along the length of the beam. The connection end between the longitudinal reinforcement (5) and the core area of ​​the node is set as a bent structure.

4. The anti-micro-vibration prefabricated beam-column connection node structure according to claim 1, characterized in that, The angle of the longitudinal reinforcement (5) bending structure is 170°. 0 .

5. The anti-micro-vibration prefabricated beam-column connection node structure according to claim 1, characterized in that, The inner side of the welded square steel pipe is welded with four "U" pre-embedded ribs, and the openings of the "U" pre-embedded ribs are symmetrically arranged in pairs.

6. The anti-micro-vibration prefabricated beam-column connection node structure according to claim 1, characterized in that, The core area of ​​the node is also equipped with an internal steel plate.

7. The anti-micro-vibration prefabricated beam-column connection node structure according to claim 5, characterized in that, The wall thickness of the welded square steel pipe (3) is 8-12 mm.

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