On-site welding-free fully-fabricated concrete frame

Abstract

The invention discloses an on-site welding-free fully-fabricated concrete frame, and relates to the technical field of fabricated buildings, the frame comprises a prefabricated upper column and a prefabricated lower column, and the prefabricated upper column and the prefabricated lower column are connected through a steel joint. The steel connector is composed of a top plate, a bottom plate and a surrounding plate, and a reserved hole is formed in the top plate and used for filling a space area defined by the surrounding plate during concrete prefabrication. Column longitudinal bars of the prefabricated upper column and the prefabricated lower column penetrate through steel connector holes in the edges of the top plate and the bottom plate respectively, are fastened and connected through bolts and are located on the outer sides of the surrounding plates. The method has the beneficial effects that welding operation is avoided, the construction complexity is reduced, the dependence on the welding process and the technical level of operators is reduced, and the construction efficiency and the quality stability are improved; the connection strength and integrity of the joint are improved, and the bearing capacity of the structure under the action of horizontal loads and earthquakes is enhanced; the construction progress and the structural reliability are guaranteed, the construction accuracy and efficiency are improved, and the risk of steel bar position dislocation during on-site assembly is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of prefabricated buildings, and more particularly to an on-site welding-free fully prefabricated concrete frame. Background Art

[0002] Prefabricated buildings refer to buildings constructed by prefabricating building components and accessories in a factory, transporting them to the construction site, and then assembling them through reliable connections. In recent years, with the rapid development of building industrialization, prefabricated concrete frames have been widely used in engineering construction due to their advantages such as fast construction speed, low environmental pollution, and controllable quality. However, the connection technology of on-site nodes has always been a key problem that has hindered the further development of prefabricated concrete frames, which is specifically reflected in the following two aspects:

[0003] On the one hand, traditional prefabricated frames typically rely on on-site welding for joint connections. This method not only increases construction complexity and places high demands on welding techniques and operator skills, but also is susceptible to environmental influences, resulting in low construction efficiency and high quality fluctuations. This makes it difficult to meet the stringent requirements for structural ductility and energy dissipation in high-intensity earthquake zones.

[0004] On the other hand, the positioning accuracy of steel bars at joints is difficult to guarantee. Prefabricated components are prone to deviation during transportation and hoisting, leading to misalignment of steel bars during on-site assembly. This can lead to connection difficulties, assembly failures, or low efficiency, seriously impacting construction progress and structural reliability.

[0005] Therefore, how to effectively avoid on-site welding operations, improve steel bar positioning accuracy, simplify construction processes, and improve construction efficiency while ensuring structural safety and seismic performance has become a core technical issue that needs to be urgently addressed in the current prefabricated building field. Summary of the Invention

[0006] In view of this, the present invention provides an on-site welding-free fully assembled concrete frame, aiming to solve the above technical problems.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] An on-site welding-free fully assembled concrete frame comprises: a prefabricated upper column and a prefabricated lower column; the prefabricated upper column and the prefabricated lower column are connected by a steel joint;

[0009] The steel joint is composed of a top plate, a bottom plate and a surrounding plate. There are multiple surrounding plates, and the multiple surrounding plates are enclosed and fixed between the top plate and the bottom plate; the top plate is provided with a reserved hole corresponding to the space enclosed by the surrounding plates, so that concrete can be poured into the space area enclosed by the surrounding plates during prefabrication; the column longitudinal reinforcements of the prefabricated upper column and the prefabricated lower column pass through the steel joint holes on the edges of the top plate and the bottom plate respectively, and are fastened with bolts, so that the prefabricated upper column is connected and fixed to the top plate of the steel joint, and the prefabricated lower column is connected and fixed to the bottom plate of the steel joint, and the column longitudinal reinforcement is located on the outside of the surrounding plate.

[0010] Through the above technical solution, the present invention provides an on-site welding-free fully assembled concrete frame, which connects the prefabricated upper column and the prefabricated lower column through steel joints. There is no need for on-site welding, which reduces the complexity of construction, reduces the dependence on welding technology and the technical level of operators, improves construction efficiency and quality stability, and is particularly suitable for high-intensity earthquake zones to meet the requirements of structural ductility and energy consumption capacity. A reserved hole is provided in the top plate of the steel joint, allowing concrete to be filled in the space area enclosed by the enclosure during prefabrication, thereby enhancing the connection strength and integrity of the node. The column longitudinal reinforcement passes through the holes in the steel joint and is fastened with bolts to ensure a reliable connection between the prefabricated upper column and the prefabricated lower column. At the same time, the column longitudinal reinforcement is located on the outside of the enclosure to avoid direct contact between the steel bar and the steel joint, reducing the risk of steel bar corrosion and extending the service life of the structure.

[0011] Preferably, in the above-mentioned on-site weld-free fully assembled concrete frame, shear pins are welded and fixed to the bottom surface of the base plate. This effectively improves the shear resistance of the joints, enhances the bearing capacity of the structure under horizontal loads, and further ensures the safety and stability of the building.

[0012] Preferably, in the above-mentioned on-site welding-free fully assembled concrete frame, during factory prefabrication, the top plate of the steel joint is pre-connected to the prefabricated upper column, and the prefabricated lower column is positioned with its column longitudinal reinforcement by a reinforcement positioning fixture, so that the column longitudinal reinforcement of the prefabricated lower column can correspond to the steel joint holes on the bottom plate of the steel joint during subsequent installation. This ensures that the column longitudinal reinforcement of the prefabricated lower column can accurately correspond to the steel joint holes on the bottom plate of the steel joint during subsequent installation, improves construction accuracy and efficiency, reduces the risk of steel bar misalignment during on-site assembly, avoids connection difficulties, assembly failures or low efficiency caused by deviations, and ensures construction progress and structural reliability.

[0013] Preferably, in the aforementioned on-site weld-free fully assembled concrete frame, the steel bar positioning fixtures are provided with pre-reserved holes corresponding to the steel joint holes. The longitudinal bars of the prefabricated lower columns are positioned using the steel bar positioning fixtures before the reinforcement of the prefabricated beams is tied. The steel bar positioning fixtures are removed and reused when the prefabricated upper columns are installed. This further improves the accuracy of steel bar positioning. The steel bar positioning fixtures can be removed and reused when the prefabricated upper columns are installed, reducing construction costs and waste generation at the construction site, thus complying with environmental protection requirements.

[0014] Preferably, in the aforementioned on-site weld-free fully assembled concrete frame, the top plate, bottom plate, and enclosure plates are all made of steel plates and are welded together. This ensures high strength and rigidity of the steel joints, enabling them to withstand large loads and deformations, guaranteeing the connection performance of the nodes and the overall stability of the structure. Furthermore, the use of steel plates facilitates processing and installation, further improving construction efficiency.

[0015] Preferably, in the aforementioned on-site weld-free fully assembled concrete frame, the floor panels are fixedly connected between the precast beams during floor assembly. This forms a unified floor structure, enhancing the floor's rigidity and load-bearing capacity, improving the building's integrity and stability, and facilitating resistance to horizontal loads and earthquakes.

[0016] Preferably, in the aforementioned on-site weld-free, fully assembled concrete frame, steel members are embedded in the precast beams, and the floor panels are provided with panel holes corresponding to the steel members, through which the steel members pass. This connection method is simple and fast, eliminating the need for complex construction procedures, improving the efficiency and quality of floor assembly, while ensuring a reliable connection between the floor panels and precast beams and enhancing the integrity of the floor structure.

[0017] Preferably, in the aforementioned on-site weld-free, fully assembled concrete frame, the outer diameter of the steel member is smaller than the aperture of the panel hole, and high-strength concrete mortar is poured into the gap between the panel hole and the steel member. This ensures a tight connection between the steel member and the floor panel, while also improving the strength and durability of the connection. The filling effect of the high-strength concrete mortar further enhances the integrity and shear resistance of the floor structure.

[0018] Preferably, in the aforementioned on-site weld-free fully assembled concrete frame, the height of the steel member exposed from the precast beams is equal to the thickness of the floor panel. This makes the connection between the floor panel and the precast beams smoother and tighter, avoids stress concentration caused by height differences, improves the load-bearing capacity and durability of the floor structure, and facilitates the installation and construction of the floor panel.

[0019] Preferably, in the above-mentioned on-site weld-free fully assembled concrete frame, stiffening plates are fixed to the enclosures, further enhancing the strength and rigidity of the steel joints, improving the bearing capacity and deformation resistance of the nodes, ensuring the stability and reliability of the nodes when bearing large loads, and extending the service life of the structure.

[0020] It can be seen from the above technical solution that, compared with the prior art, the present invention provides an on-site welding-free fully assembled concrete frame, which has the following beneficial effects:

[0021] 1. Improved construction efficiency: This eliminates on-site welding, reduces construction complexity and reliance on welding processes, and shortens construction time. The use of rebar positioning fixtures improves rebar positioning accuracy, reduces assembly failures due to deviations, and ensures construction progress. Steel joints are pre-connected to prefabricated upper columns during factory prefabrication, reducing on-site workload and improving construction efficiency.

[0022] 2. Enhanced structural safety and seismic performance: The steel joint structure consists of a top plate, bottom plate, and enclosure panels. Column longitudinal reinforcement is bolted to the steel joint, enhancing the joint's connection strength and integrity. The installation of shear pins improves the joint's shear resistance, enabling it to better withstand horizontal loads and seismic forces. Precast beams and floor panels are connected via steel components and high-strength concrete mortar, enhancing the floor's rigidity and stability.

[0023] 3. Improved construction quality: Factory-fabricated steel joints and rebar positioning fixtures ensure high precision in prefabricated components, reducing errors and quality fluctuations during on-site construction. The simple and quick connection method between prefabricated beams and floor panels reduces construction uncertainty and ensures connection reliability.

[0024] 4. Extending the service life of the structure: The longitudinal reinforcement of the columns is located outside the enclosure, avoiding direct contact between the steel bars and the steel joints, reducing the risk of steel corrosion. High-strength concrete mortar is used to fill gaps, improving the durability of the joints.

[0025] 5. Energy saving and environmental protection: The rebar positioning fixtures can be used in a revolving manner, reducing material waste during construction. Factory prefabrication reduces pollution caused by on-site welding and meets environmental protection requirements.

[0026] 6. Optimize the construction process: The overall prefabricated construction method simplifies the construction process, reduces construction steps and reduces the difficulty of on-site operations. The standardized production of prefabricated components improves the standardization and consistency of construction.

[0027] 7. Strong adaptability: This invention is applicable to a variety of construction scenarios, especially in high-intensity earthquake zones, and can meet the stringent requirements for structural ductility and energy dissipation. The stiffening plate design of the steel joints further enhances the structure's load-bearing capacity and adaptability. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0029] Figure 1 This is a schematic diagram of the on-site welding-free fully assembled concrete frame beam-column node assembly provided by the present invention;

[0030] Figure 2 A side view of a steel joint provided by the present invention;

[0031] Figure 3 A bottom view of the steel joint provided by the present invention;

[0032] Figure 4 A top view of the steel joint provided by the present invention;

[0033] Figure 5 A top view of the steel bar positioning fixture provided by the present invention;

[0034] Figure 6 A side view of the steel bar positioning fixture provided by the present invention;

[0035] Figure 7 This is a schematic diagram of the overall structure of the floor assembly provided by the present invention;

[0036] Figure 8 A side view of the overall structure of the floor assembly provided by the present invention;

[0037] Figure 9 A side view of the precast beam provided by the present invention;

[0038] Figure 10 A top view of the prefabricated beam provided by the present invention;

[0039] Figure 11 A top view of the floor panel provided by the present invention;

[0040] Figure 12 A side view of a floor panel provided by the present invention.

[0041] in:

[0042] 1- Precast upper column; 2- Steel joint; 3- Bolt; 4- Column longitudinal reinforcement; 5- Precast beam; 6- Shear pin; 7- Precast lower column; 8- Steel bar positioning fixture; 9- Reserved holes; 10- Reserved holes; 11- Steel joint holes; 12- Steel member; 13- Floor slab; 14- Slab holes; 15- High-strength concrete mortar; 16- Top slab; 17- Bottom slab; 18- Enclosure. DETAILED DESCRIPTION

[0043] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0044] See attached Figure 1 To the attached Figure 4 The embodiment of the present invention discloses an on-site welding-free fully assembled concrete frame, comprising: a prefabricated upper column 1 and a prefabricated lower column 7; the prefabricated upper column 1 and the prefabricated lower column 7 are connected by a steel joint 2;

[0045] The steel joint 2 is composed of a top plate 16, a bottom plate 17 and a surrounding plate 18. There are multiple surrounding plates 18, and the multiple surrounding plates 18 are enclosed and fixed between the top plate 16 and the bottom plate 17; the top plate 16 is provided with a reserved hole 10 corresponding to the space enclosed by the surrounding plates 18, so that concrete can be poured into the space area enclosed by the surrounding plates 18 during prefabrication; the column longitudinal reinforcement 4 of the prefabricated upper column 1 and the prefabricated lower column 7 respectively pass through the steel joint holes 11 on the edges of the top plate 16 and the bottom plate 17, and are fastened by bolts 3, so that the prefabricated upper column 1 is connected and fixed to the top plate 16 of the steel joint 2, and the prefabricated lower column 7 is connected and fixed to the bottom plate 17 of the steel joint 2, and the column longitudinal reinforcement 4 is located on the outside of the surrounding plate 18.

[0046] In order to further optimize the above technical solution, a shear pin 6 is welded and fixed to the bottom surface of the bottom plate 17 .

[0047] See attached Figure 5 To the attached Figure 6 During prefabrication in the factory, the top plate 16 of the steel joint 2 is pre-connected with the prefabricated upper column 1, and the prefabricated lower column 7 is positioned with its column longitudinal reinforcement 4 by the steel bar positioning fixture 8, so that the column longitudinal reinforcement 4 of the prefabricated lower column 7 can correspond to the steel joint hole 11 on the bottom plate 17 of the steel joint 2 during subsequent installation.

[0048] In order to further optimize the above technical solution, reserved holes 9 corresponding to the steel joint holes 11 are opened on the steel bar positioning fixture 8. Before the steel bars of the prefabricated beam 5 are tied, the column longitudinal bars 4 of the prefabricated lower column 7 are positioned by the steel bar positioning fixture 8. When the prefabricated upper column 1 is installed, the steel bar positioning fixture 8 is removed and used in rotation.

[0049] In order to further optimize the above technical solution, the top plate 16, the bottom plate 17 and the enclosure plate 18 are all made of steel plates and are fixed by welding.

[0050] See attached Figure 7 To the attached Figure 12 When the floor is assembled, the prefabricated beams 5 are fixedly connected to the floor panels 13.

[0051] In order to further optimize the above technical solution, a steel member 12 is embedded in the prefabricated beam 5 , and a panel hole 14 corresponding to the steel member 12 is opened in the floor panel 13 , and the steel member 12 passes through the panel hole 14 .

[0052] In order to further optimize the above technical solution, the outer diameter of the steel component 12 is smaller than the aperture of the plate hole 14 , and high-strength concrete mortar 15 is poured into the gap between the plate hole 14 and the steel component 12 .

[0053] In order to further optimize the above technical solution, the height of the steel member 12 exposed from the prefabricated beam 5 is equal to the thickness of the floor panel 13 .

[0054] In order to further optimize the above technical solution, a stiffening plate is fixed on the enclosure 18 .

[0055] The present invention aims to solve the problems of traditional prefabricated frames, such as the need for welding for on-site node connections, low construction efficiency, and easy deviation in steel bar positioning. The frame uses steel joints to connect prefabricated upper columns and prefabricated lower columns. The steel joints are welded from steel plates, and the longitudinal reinforcement of the upper and lower columns passes through the reserved holes in the steel joints and is fixed by bolts, without the need for on-site welding. When assembling the floor, the prefabricated beams and embedded steel components pass through the reserved holes in the plates to fix the plates, and high-strength concrete mortar is poured in the gaps to complete the connection. The connection between the steel joints and the prefabricated upper columns, the welding of the shear pins and the steel joints, and other processes are completed in the factory prefabrication stage, which greatly improves the on-site construction efficiency and reduces the difficulty of construction.

[0056] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Reference can be made to the common and similar parts between the various embodiments. For the devices disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple, and the relevant parts can be referred to the method description.

[0057] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A fully assembled concrete frame without welding on site, comprising: Prefabricated upper column (1) and prefabricated lower column (7); characterized in that: the prefabricated upper column (1) and the prefabricated lower column (7) are connected via a steel joint (2); The steel joint (2) is composed of a top plate (16), a bottom plate (17) and a panel (18), wherein the number of the panel (18) is multiple, and the multiple panels (18) are enclosed and fixed between the top plate (16) and the bottom plate (17); the top plate (16) is provided with a reserved hole (10) corresponding to the space enclosed by the panel (18), so that concrete can be poured into the space area enclosed by the panel (18) during prefabrication; the prefabricated upper column ( 1) and the column longitudinal reinforcement (4) of the prefabricated lower column (7) pass through the steel joint holes (11) at the edges of the top plate (16) and the bottom plate (17), respectively, and are fastened together by bolts (3), so that the prefabricated upper column (1) is connected and fixed to the top plate (16) of the steel joint (2), and the prefabricated lower column (7) is connected and fixed to the bottom plate (17) of the steel joint (2), and the column longitudinal reinforcement (4) is located outside the enclosure (18).

2. The on-site welding-free fully assembled concrete frame according to claim 1, characterized in that: A shear-resistant pin (6) is welded and fixed to the bottom surface of the bottom plate (17).

3. The on-site welding-free fully assembled concrete frame according to claim 1, characterized in that: During factory prefabrication, the top plate (16) of the steel joint (2) is pre-connected to the prefabricated upper column (1), and the prefabricated lower column (7) positions its column longitudinal reinforcement (4) by means of a reinforcement positioning fixture (8), so that the column longitudinal reinforcement (4) of the prefabricated lower column (7) can correspond to the steel joint hole (11) on the bottom plate (17) of the steel joint (2) during subsequent installation.

4. The on-site welding-free fully assembled concrete frame according to claim 3 is characterized in that: The steel bar positioning fixture (8) is provided with a reserved hole (9) corresponding to the steel joint hole (11); before the steel bars of the prefabricated beam (5) are tied, the column longitudinal bars (4) of the prefabricated lower column (7) are positioned by the steel bar positioning fixture (8); when the prefabricated upper column (1) is installed, the steel bar positioning fixture (8) is removed and used in a cyclical manner.

5. The on-site welding-free fully assembled concrete frame according to claim 1, characterized in that: The top plate (16), the bottom plate (17) and the enclosure plate (18) are all steel plates and are fixed by welding.

6. The on-site welding-free fully assembled concrete frame according to claim 1, characterized in that: When the floor is assembled, the prefabricated beams (5) are fixedly connected to the floor panels (13).

7. The on-site welding-free fully assembled concrete frame according to claim 6, characterized in that: A steel component (12) is embedded in the prefabricated beam (5), and a panel hole (14) corresponding to the steel component (12) is opened on the floor panel (13), and the steel component (12) passes through the panel hole (14).

8. The on-site welding-free fully assembled concrete frame according to claim 7, characterized in that: The outer diameter of the steel component (12) is smaller than the aperture of the plate hole (14), and high-strength concrete mortar (15) is poured into the gap between the plate hole (14) and the steel component (12).

9. The on-site welding-free fully assembled concrete frame according to claim 8, characterized in that: The height of the steel member (12) exposed from the prefabricated beam (5) is equal to the thickness of the floor panel (13).

10. The on-site welding-free fully assembled concrete frame according to claim 1, characterized in that: A stiffening plate is fixed on the enclosure plate (18).

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