Prefabricated concrete primary and secondary beam rigid connection joint
The precast concrete beam connection node with a steel plate bearing seat and double angle steel legs provides robust, efficient connections by maintaining beam integrity and reducing construction complexity and costs, ensuring high structural stability and durability.
Patent Information
- Application Number
- CN202422409611.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-30
- Publication Date
- 2025-07-15
- Estimated Expiration
- 2034-09-30
AI Technical Summary
The traditional connection method of precast concrete primary and secondary beams has problems such as weakening stiffness, high construction difficulty, high cost and insufficient connection rigidity, which cannot meet the needs of complex structural systems.
The rigid connection nodes of the precast concrete primary and secondary beams are adopted. By embedding steel plate support and double-angle steel support beef legs in the precast main beam, combined with the entrance design of the precast secondary beam and the mechanical sleeve connection, the rigid connection of the primary and secondary beams is realized, and the detachable special steel molds are provided for casting.
It realizes efficient and stable connections of primary and secondary beams, reduces construction difficulty and cost, improves construction efficiency and overall structural performance, and meets the connection requirements of complex structural systems.
Smart Images
Figure CN223103835U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of connecting components for prefabricated houses, and relates to a rigid connection node for precast concrete main and secondary beams. Background Art
[0002] In the development process of precast concrete structures, the connection nodes of frame main and secondary beams have always been the key links in structural design and construction. Traditional connection methods, such as post-casting with reserved notches and corbel supports, although achieving the connection of main and secondary beams to a certain extent, each has significant limitations.
[0003] For the post-casting with reserved notches method, although it can achieve the connection of main and secondary beams, the weakening effect on the stiffness of the main beam cannot be ignored. During the production, transportation, and hoisting of precast components, this method is extremely prone to the generation of cracks, and it is impossible to achieve the construction of precast beams without support and formwork, thus increasing the construction difficulty and cost.
[0004] On the other hand, although the corbel support method is simple and easy to implement, it cannot achieve the rigid connection of main and secondary beams. In terms of structural force, this method can only be defined as a hinged connection, so its application scenarios are severely limited and cannot meet the higher requirements of complex structural systems for connection nodes. Summary of the Utility Model
[0005] In view of this, the purpose of the utility model is to provide a rigid connection node for precast concrete main and secondary beams, aiming to overcome the defects of traditional connection methods and provide a more reliable, efficient, and economical connection solution for main and secondary beams.
[0006] To achieve the above purpose, the utility model provides the following technical solution: A rigid connection node for precast concrete main and secondary beams, including a precast main beam and a precast secondary beam. A steel plate support is embedded inside the precast main beam, and double angle steels are fixedly installed outside the steel plate support as corbel legs; the lower part of the end section of the precast secondary beam is retracted to form a rabbet, and the lower part of the stress-bearing steel bars of the precast secondary beam penetrates through the concrete.
[0007] The precast main beam also reserves a hole penetrating the cross-section at the position of the lower part of the stress-bearing steel bars of the precast secondary beam. After the precast secondary beam is placed and installed on the angle steel corbel legs, the lower part of the stress-bearing steel bars of the precast secondary beam is connected to the short steel bars extending into the hole through mechanical sleeves, and the anchoring connection is completed after the concrete in the node area is poured.
[0008] Optionally, a pouring hole is obliquely opened at the top of the precast secondary beam towards the rabbet direction. The pouring hole can be embedded with a corrugated pipe, and its outlet is arranged at the lower rabbet of the precast secondary beam.
[0009] Optionally, a special steel mold is detachably installed on the outer side of the rabbet end of the precast secondary beam for plugging the rabbet of the precast secondary beam.
[0010] Optionally, waist reinforcement bars and strengthening diagonal bars are arranged in the precast secondary beam, and prestressed steel bars are arranged at the bottom of the precast secondary beam.
[0011] The beneficial effects of the present utility model are as follows:
[0012] 1) The present utility model ingeniously realizes the rigid connection of the stressed steel bars at the upper and lower parts of the main and secondary beams, perfectly fitting the core concept of "equivalent to cast-in-place", thereby constructing an efficient and stable rigid connection structure for the main and secondary beams;
[0013] 2) This design effectively ensures the excellent stiffness of the precast main beam during the production, transportation, and installation stages, making it possible to construct large-span structures without supports, greatly improving the construction flexibility and efficiency;
[0014] 3) The double-angle steel bracket design is adopted. After the cast-in-place concrete is poured, no additional fire protection and anti-corrosion treatments are required, significantly reducing the maintenance cost and demonstrating excellent economy;
[0015] 4) The present utility model also provides a detachable special mold for the end of the secondary beam. This mold can achieve rapid and accurate pouring of the joint; at the same time, its reusable feature not only conforms to the concept of environmental protection but also further improves the construction economy. More importantly, this design enables the complete formwork-free and support-free construction of the lower parts of the main and secondary beams, providing strong technical support for the optimization of precast concrete structures.
[0016] Other advantages, objectives, and features of the present utility model will be described to some extent in the subsequent specification, and to some extent, will be obvious to those skilled in the art based on the study of the following text, or can be taught from the practice of the present utility model. The objectives and other advantages of the present utility model can be realized and obtained through the following specification. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] In order to make the objectives, technical solutions, and advantages of the present utility model clearer, the present utility model will be described in detail and preferably in conjunction with the accompanying drawings, where:
[0018] Figure 1 is the overall assembly schematic diagram of the present utility model;
[0019] Figure 2 is the assembly schematic diagram of the present utility model without the special steel mold;
[0020] Figure 3 is Figure 2 the cross-sectional view of
[0021] Figure 4 is the schematic diagram of the precast main beam of the present utility model;
[0022] Figure 5 Schematic diagram of the steel plate support of the present utility model;
[0023] Figure 6 Schematic diagram of the precast secondary beam of the present utility model;
[0024] Figure 7 Schematic diagram of the special steel mold of the present utility model.
[0025] Reference numerals in the drawings: precast main beam 1, precast secondary beam 2, steel plate support 3, double angle steel 4, stress steel bars 5, short steel bars 6, opening 7, mechanical sleeve 8, pouring hole 9, special steel mold 10, waist steel bars 11, reinforced inclined bars 12, prestressed steel bars 13. Detailed implementation manners
[0026] The following uses specific specific examples to illustrate the implementation manners of the present utility model. Those skilled in the art can easily understand other advantages and effects of the present utility model from the content disclosed in this specification. The present utility model can also be implemented or applied through different specific implementation manners. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present utility model. It should be noted that the drawings provided in the following embodiments only illustrate the basic concept of the present utility model in a schematic manner. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.
[0027] Among them, the drawings are only for illustrative purposes, showing only schematic diagrams, not physical diagrams, and should not be construed as a limitation to the present utility model; in order to better illustrate the embodiments of the present utility model, some components in the drawings will be omitted, enlarged or reduced, which do not represent the dimensions of the actual products; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.
[0028] In the drawings of the embodiments of the present utility model, the same or similar reference numerals correspond to the same or similar components; in the description of the present utility model, it should be understood that if there are terms such as "upper", "lower", "left", "right", "front", "rear", etc. indicating the orientation or position relationship, they are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only for illustrative purposes and should not be construed as a limitation to the present utility model. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.
[0029] Please refer to Figures 1 to 7, it is a rigid connection joint for precast concrete main and secondary beams, including a precast main beam 1 and a precast secondary beam 2. A steel plate support 3 is embedded inside the precast main beam 1, and double angle steel 4 is fixedly installed outside the steel plate support 3 as a supporting corbel; the lower part of the end section of the precast secondary beam 2 retracts to form a rabbet, and the lower stressed reinforcement 5 of the precast secondary beam 2 penetrates through the concrete; a hole 7 penetrating the cross-section is also reserved at the position of the lower stressed reinforcement 5 of the precast main beam 1 at the bottom of the precast secondary beam 2. After the precast secondary beam 2 is placed and installed on the angle steel corbel, the front end of the lower stressed reinforcement 5 of the precast secondary beam 2 is connected by a mechanical sleeve 8 and extends into the short reinforcement 6 in the hole 7. After the concrete in the joint area is poured, the anchoring connection is completed. A pouring hole 9 is also obliquely opened at the top of the precast secondary beam 2 towards the rabbet direction. The pouring hole 9 can be embedded with a corrugated pipe, and its outlet is arranged at the lower rabbet of the precast secondary beam 2. A special steel mold 10 is detachably installed outside the rabbet end of the precast secondary beam 2 for blocking the rabbet of the precast secondary beam 2. Stirrups 11 and strengthening diagonal bars 12 are arranged inside the precast secondary beam 2, and prestressed reinforcement 13 is arranged at the bottom of the precast secondary beam 2.
[0030] The construction method without support using the rigid connection structure of precast concrete main and secondary beams of the present utility model includes the following steps:
[0031] a) Precast the concrete main beam and secondary beam in the factory, where the lower part of the first stirrup at one end of the precast secondary beam 2 is a rabbet, and the lower stressed reinforcement 5 of the precast secondary beam 2 is in a protruding state;
[0032] b) Embed the steel plate support 3 inside the precast main beam 1, and weld the double angle steel 4 to the steel plate support 3 as a supporting corbel; at the same time, reserve a hole 7 penetrating the cross-section in the precast main beam 1;
[0033] c) After hoisting the precast main beam 1 to the designated position, place the precast secondary beam 2 on the supporting corbel formed by the double angle steel 4 on the precast main beam 1;
[0034] d) Install a mechanical sleeve 8 at the front end of the lower stressed reinforcement 5 of the precast secondary beam 2, then install a short reinforcement 6 at the front end of the mechanical sleeve 8 to complete the mechanical connection, and then extend the short reinforcement 6 into the hole 7 in the precast main beam 1;
[0035] e) Install the special steel mold 10 at the end of the precast secondary beam 2, and carry out the concrete pouring operation at the rabbet of the precast secondary beam 2 through the pouring hole 9 on the precast secondary beam 2 to form an integral connection joint;
[0036] f) After the concrete pouring is completed, disassemble the special steel mold 10 for reuse in the next joint.
[0037] The beneficial effects of the present utility model are mainly reflected in the following aspects:
[0038] 1) Improve the overall performance of the structure: Through the design of supporting the corbel by the embedded steel plate bearing 3 and double angle steel 4, and the anchoring connection between the bottom stressed reinforcement 5 of the precast secondary beam 2 and the opening 7 in the precast main beam 1, the rigid connection between the primary and secondary beams is realized, significantly improving the overall stability and load-bearing capacity of the structure, and meeting the higher requirements of the complex structure system for connection nodes.
[0039] 2) Optimize the construction process and reduce costs: This connection structure and its construction method achieve the construction of precast beams without supports and formwork, reducing the support and formwork materials required in traditional connection methods, simplifying the construction process, reducing the construction difficulty and costs. At the same time, the detachable design of the special steel mold 10 is convenient for repeated use, further saving material costs.
[0040] 3) Enhance the durability of the node: The rabbet design at the end of the precast secondary beam 2 and the embedding of the pouring hole 9 and corrugated pipe ensure the compactness and uniformity of concrete pouring, effectively avoiding the generation of cracks, and enhancing the durability and seismic performance of the node.
[0041] 4) Improve the construction efficiency: This connection structure and its construction method adopt the way of factory prefabrication and on-site assembly, reducing the amount of on-site wet work, shortening the construction period, and improving the construction efficiency. At the same time, the use of mechanical sleeve 8 connection also improves the reliability and construction speed of steel bar connection.
[0042] In summary, this precast concrete primary and secondary beam rigid connection structure and its support-free construction method show significant beneficial effects in improving the structural performance, optimizing the construction process, reducing costs, enhancing the durability of the node, improving the construction efficiency, and environmental protection and energy conservation.
[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not restrictive. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the present technical solution, and they should all be covered within the scope of the claims of the present invention.
Claims
1. A rigid connection joint for precast concrete primary and secondary beams, comprising a precast primary beam and a precast secondary beam, characterized in that: Steel plate supports are embedded inside the precast main beam, and double angle steels are fixedly installed outside the steel plate supports as supporting corbels; the lower part of the end section of the precast secondary beam retracts to form a rabbet, and the lower stressed steel bars of the precast secondary beam penetrate the concrete. The precast main beam also has a hole penetrating the cross-section reserved at the position of the lower stressed steel bars of the precast secondary beam. After the precast secondary beam is placed and installed on the angle steel corbel, the lower stressed steel bars of the precast secondary beam are connected by mechanical sleeves and extend into the short steel bars in the hole, and the anchoring connection is completed after the concrete in the joint area is poured.
2. The precast concrete primary-secondary beam rigid connection joint according to claim 1, wherein: The precast secondary beam is also obliquely provided with a pouring hole towards the rabbet direction at the top. The pouring hole can be embedded with a corrugated pipe, and its outlet is arranged at the lower rabbet of the precast secondary beam.
3. The precast concrete primary and secondary beam rigid connection joint according to claim 1, characterized in that: A special steel mold is also detachably installed outside the rabbet end of the precast secondary beam for plugging the rabbet of the precast secondary beam.
4. A rigid connection joint for precast concrete main and secondary beams according to claim 1, characterized in that: Waist steel bars and strengthening diagonal bars are arranged inside the precast secondary beam, and prestressed steel bars are arranged at the bottom of the precast secondary beam.