A fabricated concrete frame structure of steel sleeve grouting connection

Abstract

The application relates to the field of fabricated buildings and discloses a fabricated concrete frame structure of a steel sleeve grouting connection, which comprises a steel sleeve, connecting holes are arranged at the upper and lower ends of the steel sleeve, and threaded steel bars are arranged at the inner sides of the two connecting holes; a grouting pipe and a backflow pipe are fixedly installed on one side of the steel sleeve, a positioning shell is detachably arranged on the grouting pipe and the backflow pipe, a positioning mechanism is arranged on the positioning shell, and aluminum connecting pieces are fixedly installed at the inner sides of the two connecting holes. The application has the following advantages and effects: the positioning mechanism is arranged, the plugging head can be more conveniently and quickly aligned with the backflow pipe and the grouting pipe, the plugging speed after grouting is improved, the excessive loss of concrete slurry in the steel sleeve is reduced, the strength of the structure is ensured, the practicability of the equipment is improved, and the work efficiency is greatly improved.

Description

Technical Field

[0001] This application relates to the field of prefabricated building technology, and in particular to a prefabricated concrete frame structure with grouting connection of steel bar sleeves. Background Technology

[0002] Prefabricated building technology refers to a technical system that uses industrialized production methods as its core, prefabricating some or all of a building's components (such as walls, beams, columns, and floor slabs) in a factory, then transporting them to the site and assembling them using reliable connections (such as grouting with steel sleeves and bolt connections). It encompasses standardized design, factory production, mechanized construction, and information-based management, offering advantages such as energy conservation, reduced consumption, shorter construction periods, improved quality, and reduced pollution. It is an important direction for promoting the modernization of the construction industry and achieving green building goals, and is widely used in residential and public buildings.

[0003] In existing technologies, when grouting threaded steel bars through steel bar sleeves, excess concrete grout often flows out through the return pipe after the concrete grout is injected into the sleeve. After grouting, workers need to seal both the return pipe and the grouting pipe. However, at this time, concrete grout is flowing out of both the return pipe and the grouting pipe, which makes it difficult for workers to seal them in time. This results in excessive loss of concrete grout from the steel bar sleeve, which greatly affects the strength of the structure and poses a safety hazard.

[0004] Therefore, we propose a prefabricated concrete frame structure with grouting connection of steel sleeves to solve the above problems. Utility Model Content

[0005] To address the problem of difficulty in quickly aligning during sealing, this application provides a prefabricated concrete frame structure with a steel bar sleeve grouting connection.

[0006] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a prefabricated concrete frame structure with grouting connection of steel bar sleeve, including a steel bar sleeve, wherein both the upper and lower ends of the steel bar sleeve are provided with connection holes, and both connection holes are provided with threaded steel bars on the inner side; a grouting pipe and a return pipe are fixedly installed on one side of the steel bar sleeve, and a positioning shell is detachably fitted on both the grouting pipe and the return pipe, and a positioning mechanism is provided on the positioning shell.

[0007] A further feature of this invention is that aluminum connectors are fixedly installed on the inner sides of both connecting holes, and two threaded steel bars are respectively threaded into the corresponding aluminum connectors.

[0008] By adopting the above technical solutions, aluminum connectors can alleviate stress concentration at the interface between the reinforcing bar and the sleeve, and improve the ductility of the joint.

[0009] A further feature of this invention is that sealing rings are fixedly installed at both the upper and lower ends of the steel bar sleeve, and the inner sides of the two sealing rings are in contact with the corresponding threaded steel bars.

[0010] By adopting the above technical solutions, concrete grout leakage can be prevented.

[0011] A further feature of this invention is that threaded holes are provided on the front sides of both positioning housings, and threaded rods are threadedly connected to the inner sides of both threaded holes.

[0012] By adopting the above technical solution, it is easy to move the linked metal block by driving the threaded rod.

[0013] The present invention is further configured such that: a sliding chamber is provided on the inner side of each of the two positioning shells, two threaded holes are respectively connected to the corresponding sliding chambers, a linkage metal block is slidably installed on the inner side of each of the two sliding chambers, a linkage column is fixedly installed on both sides of each of the two linkage metal blocks, and one end of each of the two threaded rods is rotatably connected to the corresponding linkage metal block.

[0014] By adopting the above technical solution, the two linkage columns can be moved by the linkage metal block.

[0015] A further feature of this invention is that four guide grooves are provided on the left and right sides of the two positioning shells, and guide metal blocks are slidably installed on the inner side of each of the eight guide grooves.

[0016] By adopting the above technical solution, it is easy to guide the movement direction of the slider.

[0017] The present invention is further configured such that: the positioning mechanism includes eight sliders, eight linkage bars and eight clamping clips, one side of each of the eight guide metal blocks is fixedly installed with a slider, one side of each of the eight sliders is provided with two linkage ports, the inner side of each of the sixteen linkage ports is slidably installed with a corresponding linkage bar, two linkage posts are fixedly connected to the corresponding sliders respectively, and one side of each of the eight sliders is fixedly installed with a clamping clip.

[0018] By adopting the above technical solution, the slider can drive the clamping clip to move.

[0019] A further feature of this invention is that the surfaces of all eight clamping clips are coated with polytetrafluoroethylene.

[0020] By adopting the above technical solution, friction can be reduced, making it easier to pull out the grouting head or push in the sealing head.

[0021] This application includes at least one of the following beneficial technical effects: the positioning mechanism allows the sealing head to be more easily and quickly aligned with the return pipe and the grouting pipe, thereby increasing the sealing speed after grouting, reducing excessive loss of concrete grout in the steel sleeve, ensuring the strength of the structure, increasing the practicality of the equipment, and greatly improving work efficiency. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural diagram of a prefabricated concrete frame structure with grouting connection of steel bar sleeves proposed in this embodiment;

[0023] Figure 2 This is a three-dimensional structural breakdown diagram of a prefabricated concrete frame structure with grouting connection of steel bar sleeves proposed in this embodiment;

[0024] Figure 3 This is a three-dimensional cross-sectional view of a positioning mechanism for a prefabricated concrete frame structure with a steel bar sleeve grouting connection proposed in this embodiment.

[0025] Figure 4 This is a three-dimensional exploded view of the positioning mechanism for a prefabricated concrete frame structure with a steel bar sleeve grouting connection proposed in this embodiment.

[0026] Figure 5 This is a three-dimensional structural disassembly diagram of the positioning mechanism for a prefabricated concrete frame structure with a steel bar sleeve grouting connection proposed in this embodiment.

[0027] In the diagram, 1. Rebar sleeve; 2. Threaded rebar; 3. Sealing ring; 4. Aluminum connector; 5. Grouting pipe; 6. Return pipe; 7. Positioning shell; 8. Threaded rod; 9. Linkage metal block; 10. Linkage column; 11. Guide groove; 12. Guide metal block; 13. Slider; 14. Linkage bar; 15. Clamping clip. Detailed Implementation

[0028] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail.

[0029] This application discloses a prefabricated concrete frame structure with grouting connection of steel bar sleeves, including a steel bar sleeve 1. Both the upper and lower ends of the steel bar sleeve 1 are provided with connection holes, and the inner side of both connection holes is provided with threaded steel bars 2. A grouting pipe 5 and a return pipe 6 are fixedly installed on one side of the steel bar sleeve 1. A positioning shell 7 can be detachably fitted on both the grouting pipe 5 and the return pipe 6. A positioning mechanism is provided on the positioning shell 7.

[0030] Specifically, aluminum connectors 4 are fixedly installed on the inner sides of both connecting holes, and two threaded steel bars 2 are threaded into their respective aluminum connectors 4. The aluminum connectors 4 can alleviate stress concentration at the interface between the steel bars and the sleeve, improving the ductility of the joint. The aluminum connectors 4 are made of 6061-T6 aluminum alloy with a wall thickness of 5mm. This material and thickness design, verified by finite element analysis, can reduce the stress concentration at the connection interface by 30%-40% under design loads, while meeting the mechanical performance requirements of GB / T 6892-2015 "General Industrial Aluminum and Aluminum Alloy Extruded Profiles". The inner wall of the aluminum connectors 4 is machined with threads adapted to the threaded steel bars 2, with a pitch of 3mm and a thread angle of 60°, ensuring a tight connection with the threaded steel bars 2 and preventing loosening.

[0031] Specifically, sealing rings 3 are fixedly installed at both the upper and lower ends of the rebar sleeve 1. The inner sides of the two sealing rings 3 are in contact with the corresponding threaded rebars 2 to prevent concrete grout leakage. The sealing rings 3 are made of silicone rubber with a Shore hardness of 60-70 degrees. Verified through 100 simulated grouting experiments under a grouting pressure of 0.5 MPa, they effectively prevent grout leakage. The sealing rings 3 have an O-shaped cross-section, with an outer diameter 2 mm larger than the diameter of the connecting hole and an inner diameter 1 mm smaller than the diameter of the threaded rebar 2. Through an interference fit, they can tightly adhere to the threaded rebar 2 under concrete grout pressure, forming a reliable seal.

[0032] Specifically, both positioning housings 7 have threaded holes on their front sides, and threaded rods 8 are threaded onto the inner sides of both holes, facilitating the movement of the linkage metal block 9 via the threaded rods 8. The threaded rods 8 use trapezoidal threads with a pitch of 2mm and a pitch diameter tolerance of 7h. This thread design features high transmission efficiency and strong load-bearing capacity, enabling precise displacement control of the linkage metal block 9 while ensuring ease of operation. For ease of operation, a 20mm diameter knob is installed at one end of the threaded rod 8, with anti-slip textured surfaces to increase friction and facilitate rotation.

[0033] Specifically, each of the two positioning housings 7 has a sliding chamber on its inner side, and two threaded holes are connected to the corresponding sliding chambers. A linkage metal block 9 is slidably installed inside each of the two sliding chambers, and linkage columns 10 are fixedly installed on both sides of each linkage metal block 9. One end of each of the two threaded rods 8 is rotatably connected to the corresponding linkage metal block 9, allowing the linkage metal block 9 to drive the two linkage columns 10 to move. The surface roughness Ra of the inner wall of the sliding chamber is controlled below 0.8μm and is hard chrome plated, achieving a hardness of HV800-1000 to reduce friction during sliding of the linkage metal block 9, improve wear resistance, and ensure long-term stable sliding. The linkage metal block 9 is designed to be 30mm long, 20mm wide, and 15mm high, weighing 150g. This size and weight ensure structural strength while achieving rapid response.

[0034] Specifically, four guide grooves 11 are provided on the left and right sides of each of the two positioning shells 7. Guide metal blocks 12 are slidably installed on the inner sides of each of the eight guide grooves 11 to guide the movement direction of the slider 13. The width of the guide groove 11 is 0.1mm larger than the width of the guide metal block 12, and the depth is 10mm. This size design ensures that the guide metal block 12 can slide flexibly within the guide groove 11 while limiting its wobbling range, ensuring the accuracy of the slider 13's movement trajectory. The guide metal block 12 is made of 45# steel and has undergone quenching treatment to achieve a hardness of HRC40-45, improving wear resistance and service life.

[0035] Specifically, the positioning mechanism includes eight sliders 13, eight linkage bars 14, and eight clamping clips 15. Each of the eight guide metal blocks 12 has a slider 13 fixedly mounted on one side. Each of the eight sliders 13 has two linkage ports on one side. Corresponding linkage bars 14 are slidably mounted on the inner sides of the sixteen linkage ports. Two linkage posts 10 are fixedly connected to their respective sliders 13. Each of the eight sliders 13 has a clamping clip 15 fixedly mounted on one side, allowing the clamping clips 15 to move via the sliders 13. The clamping clips 15 are made of spring steel with an elastic modulus of 15 N / mm, providing sufficient and stable clamping force when clamping grouting heads or sealing heads. The opening size of the clamping clips 15 is designed to be 25 mm based on the outer diameter of common grouting heads and sealing heads, and an anti-slip rubber pad is installed inside to increase friction and ensure secure clamping.

[0036] Specifically, all eight clamping clips 15 have a polytetrafluoroethylene (PTFE) coating on their surfaces to reduce friction, thus facilitating the removal of the grouting head or the insertion of the sealing head. The PTFE coating is 0.05 mm thick and achieves a grade 0 standard in the coating adhesion test (cross-cut test), demonstrating excellent adhesion performance. This coating reduces the coefficient of friction between the clamping clips 15 and the grouting head or sealing head to 0.05. In actual operation, operators only need to apply a force of 5 N to easily insert or remove the grouting head or sealing head.

[0037] Working principle: When grouting concrete slurry, the worker first places the positioning shell 7 onto the return pipe 6 and the grouting pipe 5 using a snap-fit ​​structure. The locking force of the snap-fit ​​is 10N to ensure that the positioning shell 7 is securely installed. Then, the grouting head or sealing head is placed between the four clamping clips 15 on the left side. At this time, the threaded rod 8 is rotated by the knob with anti-slip texture. Since the positioning shell 7 has a threaded hole on one side, the threaded rod 8 is threadedly connected to the threaded hole, so the threaded rod 8 moves axially when rotated. For each revolution of the threaded rod 8, the linkage metal block 9 moves 2mm axially. This movement of the linkage metal block 9 moves the two linkage columns 10, which in turn moves the two corresponding sliders 13. The sliders 13 then move their respective linkage ports, and the movement of these four ports moves the corresponding linkage bars 14. Each of the four linkage bars 14 moves its corresponding slider 13, and vice versa. The movement of two linkage bars 14 on the same side moves the same slider 13, resulting in all four sliders 13 on the same side moving. Each of the eight sliders 13 has a guide metal block 12 fixedly installed on one side. These guide metal blocks 12 slide in their corresponding guide grooves 11. The size of the guide grooves 11 restricts the movement of the eight sliders 13, allowing only forward and backward movement. The four sliders 13 on the right side move closer together, moving their corresponding clamping clips 15 to position the return pipe 6 and the grouting pipe 5. The four clamping clips 15 on the left side then securely hold the sealing head or grouting head. After grouting is completed, workers only need to apply a force of 5N to pull out the grouting head, and then push the sealing head to slide. Due to the PTFE coating on the surface of the clamping clip 15 reducing friction, the sealing head can be easily pushed in, quickly sealing the return pipe 6 and the grouting pipe 5, preventing excessive loss of concrete grout from the rebar sleeve. At the same time, the sealing rings 3 at the upper and lower ends of the rebar sleeve 1 fit tightly against the threaded rebar 2 through interference fit, effectively preventing grout leakage from the connection hole under a grouting pressure of 0.5MPa; the aluminum connector 4, with its reasonable material, size and thread design, alleviates the stress concentration at the connection interface between the rebar and the sleeve, further ensuring the strength and stability of the structure.

[0038] With the above structure, the prefabricated concrete frame structure with grouting connection of steel sleeve provided in this application can make it easier and faster to align the sealing head with the return pipe 6 and the grouting pipe 5 through the positioning mechanism, thereby improving the sealing speed after grouting, reducing the excessive loss of concrete grout in the steel sleeve 1, ensuring the strength of the structure, increasing the practicality of the equipment, and greatly improving the work efficiency.

[0039] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A prefabricated concrete frame structure with grouted steel bar sleeve connection, characterized in that, The steel bar sleeve (1) is provided with connecting holes at both the upper and lower ends, and threaded steel bars (2) are provided on the inner side of both connecting holes. A grouting pipe (5) and a return pipe (6) are fixedly installed on one side of the steel bar sleeve (1). A positioning shell (7) can be detachably fitted on both the grouting pipe (5) and the return pipe (6). A positioning mechanism is provided on the positioning shell (7). An aluminum connector (4) is fixedly installed on the inner side of the two connecting holes. Two threaded steel bars (2) are respectively threaded into the corresponding aluminum connector (4). A sealing ring (3) is fixedly installed on both the upper and lower ends of the steel bar sleeve (1). The inner side of the two sealing rings (3) is in contact with the corresponding threaded steel bars (2). Both positioning shells (7) have threaded holes on their front sides, and threaded rods (8) are threadedly connected to the inner sides of both threaded holes. Both positioning shells (7) have sliding chambers on their inner sides, and the two threaded holes are connected to the corresponding sliding chambers respectively. Both sliding chambers have linkage metal blocks (9) slidably installed on their inner sides. Both linkage metal blocks (9) have linkage columns (10) fixedly installed on both sides. One end of each of the two threaded rods (8) is rotatably connected to the corresponding linkage metal block (9). Both positioning shells (7) have four guide grooves (11) on their left and right sides, and guide metal blocks (12) are slidably installed on the inner sides of the eight guide grooves (11). The positioning mechanism includes eight sliders (13), eight linkage bars (14) and eight clamping clips (15). Each of the eight guide metal blocks (12) has a slider (13) fixedly installed on one side. Each of the eight sliders (13) has two linkage ports on one side. The inner side of each of the sixteen linkage ports is slidably installed with a corresponding linkage bar (14). Two linkage posts (10) are fixedly connected to the corresponding sliders (13). Each of the eight sliders (13) has a clamping clip (15) fixedly installed on one side.

2. A fabricated concrete frame structure of grout injected reinforcing sleeve connections as claimed in claim 1, wherein: The surfaces of the eight clamping clips (15) are all coated with polytetrafluoroethylene.

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