Primary and secondary beam connecting joint and beam-slab structure
Through the design of steel-concrete supports and post-cast connectors at the primary and secondary beam nodes, the fire hazards and construction safety issues of the prefabricated primary and secondary beam connection nodes are resolved, and a support-free connection without fire hazards is achieved. The force transmission is clear, the vertical and horizontal forces are clearly separated, and the shear resistance effect is good.
Patent Information
- Application Number
- CN202422927493.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-29
- Publication Date
- 2025-10-28
- Estimated Expiration
- 2034-11-29
AI Technical Summary
The existing prefabricated main and secondary beam connection nodes have fire hazards and safety hazards during the construction process, especially the problems of reduced effective height of prefabricated main beams and interrupted longitudinal reinforcement.
The design adopts the main beam steel-concrete support and secondary beam steel-concrete support combined with post-cast connectors. The main beam steel corbel is embedded and covered with concrete. The secondary beam steel corbel is overlapped with the main beam steel-concrete support, and the connectors are inserted through the post-cast connection holes to fill them. The shear reinforcement is continuously arranged in the cast-in-place layer.
A support-free connection with no fire hazard is achieved. The construction process is safe and reliable, the force transmission is clear, the vertical force is borne by the steel corbel, and the horizontal force is borne by the post-cast connector, with good shear resistance.
Smart Images
Figure CN223481993U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of prefabricated buildings, and in particular relates to a main and secondary beam connection node and a beam-slab structure. Background Technology
[0002] In conventional civil building structures in my country, primary and secondary beams are often used to support floor slabs and bear floor loads. Therefore, precast primary and secondary beam connections are also prevalent in prefabricated concrete frame structures that are "equivalent to cast-in-place".
[0003] In the existing technology, there are two existing structures for precast main beams and precast secondary beams:
[0004] Firstly, a notch is made in the precast main beam to support the precast secondary beams; however, this structure will reduce the effective height of the precast main beam and break the longitudinal reinforcement of the beam, making it difficult to achieve the bracing-free construction process.
[0005] Secondly, steel supports are installed on the sides of the precast main beams, and steel plates are installed at the ends of the precast secondary beams. The two are connected by steel supports and steel plates. However, this joint is exposed to the outside, which poses a fire problem. In the event of a fire, the heavy secondary beams rely entirely on the steel supports and steel plates for connection. If the steel supports and steel plates fail in the event of a fire, there will be a major safety hazard.
[0006] Therefore, there is an urgent need to propose a primary-secondary beam joint that is free from fire hazards, requires no bracing, and does not affect the precast primary beam.
[0007] It should be noted that the information disclosed in the background section of this utility model is intended only to enhance the understanding of the general background of this utility model, and should not be regarded as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Utility Model Content
[0008] One objective of this utility model is to propose a primary-secondary beam joint that is free from fire hazards, can be supported without support, and does not affect the precast main beam.
[0009] The second objective of this utility model is to propose a beam-slab structure that is free from fire hazards and can be supported without bracing.
[0010] To achieve one of the above objectives, this utility model first provides a primary and secondary beam connection node, characterized in that it includes:
[0011] A precast main beam, wherein a steel-concrete support is provided on the side of the precast main beam, the steel-concrete support of the main beam includes a steel corbel of the main beam and a concrete outer covering of the main beam, the steel corbel of the main beam is connected to the main beam structural reinforcement inside the precast main beam and extends to the side of the precast main beam, the concrete outer covering of the main beam is formed and covers the steel corbel of the main beam, and a first post-cast connection hole is provided on the steel-concrete support of the main beam;
[0012] A precast secondary beam, the end of which forms a secondary beam steel-concrete support, the secondary beam steel-concrete support overlapping the main beam steel-concrete support, the secondary beam steel-concrete support being provided with a second post-cast connection hole, the position of the second post-cast connection hole corresponding to the first post-cast connection hole;
[0013] The post-pouring connector is used to connect the first post-pouring connection hole and the second post-pouring connection hole, and then the pouring is completed.
[0014] Preferably, the main beam steel bracket includes a first H-beam and a first shear key. The first H-beam is partially located inside the precast main beam and partially extends to the side of the precast main beam and is covered by the outer concrete of the main beam. The first shear key is provided on the web of the first H-beam.
[0015] Preferably, the first post-cast connection hole penetrates at least through the web of the first H-beam.
[0016] Preferably, the secondary beam steel-concrete support includes a secondary beam steel bracket and a secondary beam outer concrete covering; the secondary beam steel bracket is connected to the secondary beam structural reinforcement in the precast secondary beam and extends to the end of the precast secondary beam, and the secondary beam outer concrete covering is formed and covers the secondary beam steel bracket.
[0017] Preferably, the secondary beam steel bracket includes a second H-beam and a second shear key, the second shear key being disposed on the web of the second H-beam.
[0018] Preferably, the second post-cast connection hole penetrates the secondary beam steel-concrete support and at least penetrates the web of the second H-beam.
[0019] The technical effects achieved by the above-mentioned technical solution of this utility model are derived from one or more of the following combinations:
[0020] The main and secondary beam nodes of this scheme do not require prefabrication of the top notch of the main beam or interruption of the longitudinal reinforcement inside the beam, making the construction process safe and reliable.
[0021] The main beam steel brackets are all pre-embedded and covered with a concrete structure, providing good fire resistance.
[0022] The precast main beam and precast secondary beam have clear force transmission and are safe and reliable. The vertical force is borne by the steel bracket of the main beam, and the horizontal force is borne by the post-cast connector (inserted reinforcement).
[0023] To achieve the above two objectives, this utility model provides a beam-slab structure, characterized in that it includes a floor slab and a connection node between main and secondary beams. The floor slab includes a composite base slab and a cast-in-place layer. The composite base slab is laid on the connection node between the main and secondary beams, and the cast-in-place layer is formed on the composite base slab.
[0024] Preferably, the precast main beam and / or the precast secondary beam are provided with shear reinforcement, which extends into the cast-in-place layer.
[0025] Preferably, the shear reinforcement is U-shaped shear reinforcement, arranged at continuous intervals along the beam length of the precast main beam or the precast secondary beam.
[0026] Preferably, the top surfaces of the precast secondary beam and the precast main beam are flush.
[0027] The technical effects achieved by the above-mentioned technical solution of this utility model are derived from one or more of the following combinations:
[0028] In beam-slab structures, the main and secondary beam joints do not require prefabrication of the top notch of the main beam or interruption of the longitudinal reinforcement within the beam, ensuring safety and reliability during construction.
[0029] The main beam steel brackets are all pre-embedded and covered with a concrete structure, providing good fire resistance.
[0030] The precast main beam and precast secondary beam have clear force transmission and are safe and reliable. The vertical force is borne by the steel bracket of the main beam, and the horizontal force is borne by the post-cast connector (inserted reinforcement).
[0031] The U-shaped shear reinforcement is continuous at the top and has good shear resistance in the cast-in-place floor slab. Attached Figure Description
[0032] Figure 1 The diagram illustrates the structure of the connection between the primary and secondary beams.
[0033] Figure 2 The diagram shows the steel structure of the connection nodes between the main and secondary beams.
[0034] Figure 3 The diagram shows the steel structure of the precast secondary beams.
[0035] Figure 4 The diagram shows the structural schematic of the main beam steel bracket.
[0036] Figure 5 The diagram shows the structure of the secondary beam steel bracket.
[0037] Figure 6 The diagram illustrates the structure of the beam-slab structure.
[0038] The components are: 1. Precast main beam; 2. Precast secondary beam; 3. Main beam steel-concrete support; 30. First post-cast connection hole; 31. First H-beam; 32. First shear key; 4. Secondary beam steel-concrete support; 40. Second post-cast connection hole; 41. Second H-beam; 42. Second shear key; 5. Post-cast connector; 6. Shear reinforcement; 7. Composite bottom plate; 8. Dowel bars. Detailed Implementation
[0039] The following description is provided to enable those skilled in the art to implement and use the present invention and to incorporate it into specific application contexts. Various modifications and uses in different applications will be readily apparent to those skilled in the art, and the general principles defined herein are applicable to a wide range of embodiments. Therefore, the present invention is not limited to the embodiments given herein, but should be granted the broadest scope consistent with the principles and novel features disclosed herein.
[0040] In the following detailed description, numerous specific details are set forth to provide a more thorough understanding of the present invention. However, it will be apparent to those skilled in the art that practice of the present invention is not necessarily limited to these specific details. In other words, well-known structures and devices are shown in block diagram form without detailed representation to avoid obscuring the present invention.
[0041] Readers should note all documents and references submitted concurrently with this specification and open to public inspection, the contents of which are incorporated herein by reference. Unless otherwise expressly stated, all features disclosed in this specification (including any appended claims, abstracts, and drawings) may be replaced by alternative features for the same, equivalent, or similar purposes. Therefore, unless explicitly stated otherwise, each disclosed feature is merely one example of a set of equivalent or similar features.
[0042] Note that, where used, the markings left, right, front, back, top, bottom, front, back, clockwise, and counterclockwise are merely for convenience and do not imply any specific fixed direction. In fact, they are used to reflect the relative position and / or orientation between different parts of an object. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0043] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0044] Note that, in practice, "further," "preferably," "even further," and "more preferably" are simply starting points for describing another embodiment based on the foregoing embodiments. The combination of the content following "further," "preferably," "even further," or "more preferably" with the foregoing embodiments constitutes the complete configuration of another embodiment. Any combination of several "further," "preferably," "even further," or "more preferably" settings following the same embodiment can form yet another embodiment.
[0045] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. It should be noted that the aspects described below with reference to the accompanying drawings and specific embodiments are merely exemplary and should not be construed as limiting the scope of protection of the present invention in any way.
[0046] Example 1:
[0047] Please see Figures 1-5 This embodiment discloses a main-secondary beam connection node, including a precast main beam 1, a precast secondary beam 2, and a post-cast connector 5. The precast main beam 1 has a main beam steel-concrete support 3 on its side. The main beam steel-concrete support 3 includes a main beam steel bracket and a main beam outer concrete covering. The main beam steel bracket is connected to the main beam structural reinforcement within the precast main beam 1 and extends to the side of the precast main beam 1. The main beam outer concrete covering is formed and covers the main beam steel bracket. The main beam steel-concrete support 3 has a first post-cast connection hole 30. The end of the precast secondary beam 2 forms a secondary beam steel-concrete support 4, which overlaps the main beam steel-concrete support 3. The secondary beam steel-concrete support 4 has a second post-cast connection hole 40, the position of which corresponds to the first post-cast connection hole 30. The first post-cast connection hole 30 and the second post-cast connection hole 40 are connected by the post-cast connector 5 and then filled with concrete.
[0048] The main beam steel bracket, serving as a structural component of the main beam reinforced concrete support 3, includes a first H-beam 31 and a first shear key 32. Specifically, the first H-beam 31 is partially located inside the precast main beam 1, and partially extends to the side of the precast main beam 1 and is covered by the main beam's outer concrete covering. The first shear key 32 is located on the web of the first H-beam 31. The main beam steel bracket, as a structural component, is formed by being covered by the main beam's outer concrete covering, ensuring that the steel structure is not exposed and providing fireproofing and corrosion protection.
[0049] The precast secondary beam 2 is connected to the main beam steel-concrete support 3 via the secondary beam steel-concrete support 4. A first post-cast connection hole 30 and a second post-cast connection hole are provided at opposite positions to limit their horizontal positions. To improve the overall integrity of the connection with the main beam steel bracket, in this embodiment, the first post-cast connection hole 30 at least penetrates the web of the first H-beam 31, and the second post-cast connection hole directly penetrates the secondary beam steel-concrete support 4, facilitating the insertion of the post-cast connector 5 through the second post-cast connection hole 40.
[0050] Similarly, the secondary beam steel-concrete support 4 includes a secondary beam steel bracket and a secondary beam outer concrete covering. The secondary beam steel bracket is connected to the secondary beam structural reinforcement within the precast secondary beam 2 and extends to the end of the precast secondary beam 2. The secondary beam outer concrete covering is formed and covers the secondary beam steel bracket. Further, the secondary beam steel bracket includes a second H-beam 41 and a second shear key 42, the second shear key 42 being disposed on the web of the second H-beam 41. As described above, the second post-cast connection hole 40 penetrates the secondary beam steel-concrete support 4. Further, the second post-cast connection hole 40 at least penetrates the web of the second H-beam 41.
[0051] It should be noted that in this embodiment, both the main beam steel bracket and the secondary beam steel bracket are made of H-beams, but this is not a limitation. The purpose is to increase the stiffness of the main beam steel-concrete support 3 and the secondary beam steel-concrete support 4, thereby improving the vertical bearing capacity. Other steel structures, such as composite angle steel and composite channel steel, can also be used.
[0052] The beneficial effects of this embodiment:
[0053] The main and secondary beam nodes of this scheme do not require prefabrication of the top notch of the main beam 1 or interruption of the longitudinal reinforcement inside the beam, making the construction process safe and reliable.
[0054] The main beam steel brackets are all pre-embedded and covered with a concrete structure, providing good fire resistance.
[0055] The precast main beam 1 and precast secondary beam 2 have clear force transmission and are safe and reliable. The vertical force is borne by the steel bracket of the main beam, and the horizontal force is borne by the post-cast connector 5 (inserted reinforcement).
[0056] Example 2:
[0057] Please see Figure 6 and combined Figures 1-5 This embodiment discloses a beam-slab structure, including a floor slab and main and secondary beam connection nodes. The floor slab includes a composite base slab 7 and a cast-in-place layer. The composite base slab 7 is laid on the main and secondary beam connection nodes, and the cast-in-place layer is formed on the composite base slab 7. This embodiment is implemented as a prefabricated beam-slab structure. A frame structure is formed by the main and secondary beam nodes in conjunction with structural columns. The composite base slab 7 is laid on the main and secondary beams to form a formwork that does not need to be removed, and then the cast-in-place layer is poured to form the composite floor slab.
[0058] The main and secondary beam connection node includes a precast main beam 1, a precast secondary beam 2, and a post-cast connector 5. The precast main beam 1 has a main beam steel-concrete support 3 on its side. The main beam steel-concrete support 3 includes a main beam steel bracket and a main beam outer concrete covering. The main beam steel bracket is connected to the main beam structural reinforcement inside the precast main beam 1 and extends to the side of the precast main beam 1. The main beam outer concrete covering is formed and covers the main beam steel bracket. The main beam steel-concrete support 3 has a first post-cast connection hole 30. The end of the precast secondary beam 2 forms a secondary beam steel-concrete support 4, which overlaps the main beam steel-concrete support 3. The secondary beam steel-concrete support 4 has a second post-cast connection hole 40, the position of which corresponds to the first post-cast connection hole 30. The first post-cast connection hole 30 and the second post-cast connection hole 40 are connected by the post-cast connector 5 and then filled with concrete.
[0059] The main beam steel bracket, serving as a structural component of the main beam reinforced concrete support 3, includes a first H-beam 31 and a first shear key 32. Specifically, the first H-beam 31 is partially located inside the precast main beam 1, and partially extends to the side of the precast main beam 1 and is covered by the main beam's outer concrete covering. The first shear key 32 is located on the web of the first H-beam 31. The main beam steel bracket, as a structural component, is formed by being covered by the main beam's outer concrete covering, ensuring that the steel structure is not exposed and providing fireproofing and corrosion protection.
[0060] The precast secondary beam 2 is connected to the main beam steel-concrete support 3 via the secondary beam steel-concrete support 4. A first post-cast connection hole 30 and a second post-cast connection hole are provided at opposite positions to limit their horizontal positions. To improve the overall integrity of the connection with the main beam steel bracket, in this embodiment, the first post-cast connection hole 30 at least penetrates the web of the first H-beam 31, and the second post-cast connection hole directly penetrates the secondary beam steel-concrete support 4, facilitating the insertion of the post-cast connector 5 through the second post-cast connection hole 40.
[0061] Similarly, the secondary beam steel-concrete support 4 includes a secondary beam steel bracket and a secondary beam outer concrete covering. The secondary beam steel bracket is connected to the secondary beam structural reinforcement within the precast secondary beam 2 and extends to the end of the precast secondary beam 2. The secondary beam outer concrete covering is formed and covers the secondary beam steel bracket. Further, the secondary beam steel bracket includes a second H-beam 41 and a second shear key 42, the second shear key 42 being disposed on the web of the second H-beam 41. As described above, the second post-cast connection hole 40 penetrates the secondary beam steel-concrete support 4. Further, the second post-cast connection hole 40 at least penetrates the web of the second H-beam 41.
[0062] It should be noted that in this embodiment, both the main beam steel bracket and the secondary beam steel bracket are made of H-beams, but this is not a limitation. The purpose is to increase the stiffness of the main beam steel-concrete support 3 and the secondary beam steel-concrete support 4, thereby improving the vertical bearing capacity. Other steel structures, such as composite angle steel and composite channel steel, can also be used.
[0063] Furthermore, shear reinforcement 6 is provided on the precast main beam 1 and / or precast secondary beam 2, extending into the cast-in-place layer. Specifically, as a preferred embodiment of this example, shear reinforcement 6 is provided on both the precast main beam 1 and the precast secondary beam 2. Preferably, the shear reinforcement 6 is U-shaped, with the shear reinforcement 6 on the precast main beam 1 arranged at continuous intervals along the beam length direction; the shear reinforcement 6 on the precast secondary beam 2 is arranged at continuous intervals along the beam length direction. Taking the composite base plate 7 laid on the precast secondary beam 2 as an example, at least two composite base plates 7 are laid on the precast secondary beam 2, forming a post-cast space between them. The shear reinforcement 6 is located in this post-cast space and connected through the cast-in-place layer. It should be noted that, to ensure flatness, the top surfaces of the precast secondary beam 2 and the precast main beam 1 are flush, forming a flat laying surface.
[0064] Unlike traditional shear reinforcement, the U-shaped shear reinforcement in this embodiment can be arranged in a single row along the beam length, thus occupying less space in the beam width. This allows the composite bottom plates 7 on both sides to be laid to a greater depth on the beam, and the post-cast space between them to be smaller. Therefore, it is easier to lay and the structure is more stable.
[0065] Furthermore, insert bars 8 are provided in the U-shaped shear reinforcement 6, with both ends of the insert bars 8 extending to the cast-in-place layer above the composite bottom plate 7 on both sides, to achieve a connection function.
[0066] The beneficial effects of this embodiment:
[0067] In beam-slab structures, the main and secondary beam joints do not require prefabrication of the top notch of the main beam 1 or interruption of the longitudinal reinforcement within the beam, ensuring safety and reliability during construction.
[0068] The main beam steel brackets are all pre-embedded and covered with a concrete structure, providing good fire resistance.
[0069] The precast main beam 1 and precast secondary beam 2 have clear force transmission and are safe and reliable. The vertical force is borne by the steel bracket of the main beam, and the horizontal force is borne by the post-cast connector 5 (inserted reinforcement).
[0070] The U-shaped shear reinforcement bar 6 is continuous at the top and has good shear resistance in the cast-in-place floor slab.
[0071] U-shaped shear reinforcement bars can be arranged in a single row along the beam length, thus occupying less space in the beam width. This allows for a greater depth of the composite bottom slabs 7 laid on the beam on both sides, and a smaller space for post-casting between them. Therefore, it is easier to lay the reinforcement bars, and the structure is more stable.
[0072] Furthermore, the present invention has been described in detail above with reference to the accompanying drawings and embodiments. Those skilled in the art can make various modifications to the present invention based on the above description. Therefore, certain details in the embodiments should not be construed as limiting the present invention, and the scope of protection of the present invention shall be defined by the appended claims.
Claims
1. A connection node between primary and secondary beams, characterized in that, include: A precast main beam, wherein a steel-concrete support is provided on the side of the precast main beam, the steel-concrete support of the main beam includes a steel corbel of the main beam and a concrete outer covering of the main beam, the steel corbel of the main beam is connected to the main beam structural reinforcement inside the precast main beam and extends to the side of the precast main beam, the concrete outer covering of the main beam is formed and covers the steel corbel of the main beam, and a first post-cast connection hole is provided on the steel-concrete support of the main beam; A precast secondary beam, the end of which forms a secondary beam steel-concrete support, the secondary beam steel-concrete support overlapping the main beam steel-concrete support, the secondary beam steel-concrete support being provided with a second post-cast connection hole, the position of the second post-cast connection hole corresponding to the first post-cast connection hole; The post-pouring connector is used to connect the first post-pouring connection hole and the second post-pouring connection hole, and then the pouring is completed.
2. The primary and secondary beam connection node as described in claim 1, characterized in that: The main beam steel bracket includes a first H-beam and a first shear key. The first H-beam is partially located inside the precast main beam and partially extends to the side of the precast main beam and is covered by the concrete covering of the main beam. The first shear key is provided on the web of the first H-beam.
3. The primary and secondary beam connection node as described in claim 2, characterized in that: The first post-cast connection hole penetrates at least through the web of the first H-beam.
4. The primary and secondary beam connection node as described in claim 1, characterized in that: The secondary beam steel-concrete support includes a secondary beam steel bracket and a secondary beam outer concrete covering; the secondary beam steel bracket is connected to the secondary beam structural reinforcement in the precast secondary beam and extends to the end of the precast secondary beam, and the secondary beam outer concrete covering is formed and covers the secondary beam steel bracket.
5. The primary and secondary beam connection node as described in claim 4, characterized in that: The secondary beam steel bracket includes a second H-beam and a second shear key, with the second shear key located on the web of the second H-beam.
6. The primary and secondary beam connection node as described in claim 5, characterized in that: The second post-cast connection hole penetrates the secondary beam steel-concrete support and at least penetrates the web of the second H-beam.
7. A beam-slab structure, characterized in that, The system includes a floor slab and a primary and secondary beam connection node as described in any one of claims 1 to 6. The floor slab includes a composite base slab and a cast-in-place layer. The composite base slab is laid on the primary and secondary beam connection node, and the cast-in-place layer is formed on the composite base slab.
8. The beam-slab structure as described in claim 7, characterized in that: The precast main beam and / or the precast secondary beam are provided with shear reinforcement, which extends into the cast-in-place layer.
9. The beam-slab structure as described in claim 8, characterized in that: The shear reinforcement is U-shaped and is arranged at continuous intervals along the beam length of the precast main beam or the precast secondary beam.
10. The beam-slab structure as described in claim 7, characterized in that: The top surfaces of the precast secondary beams and the precast main beams are flush.