A precast concrete cross node connected by a pin

Abstract

This invention relates to the field of prefabricated concrete construction, specifically to a precast concrete cross joint using a pin connection. It includes a column and a beam connected to the column. Multiple beam end lugs are fixed to the end of the beam facing the column. A first column side lug and a second column side lug are fixed to the column on either side of the beam end lugs. A pin passes through the first column side lug, the second column side lug, and the beam end lugs, connecting the beam and the column. This invention allows for manual installation of the pin without the need for tools. After the fixing block and the slider located in the placement groove are locked in the slot by the locking tongue, the end of the locking block away from the pin's axis protrudes to the outside of the pin. The locking tongue and the locking block prevent the pin from falling off, thus improving the installation efficiency of the pin.

Description

Technical Field

[0001] This invention relates to the field of prefabricated concrete buildings, specifically to a precast concrete cross joint using pin connections. Background Technology

[0002] Precast concrete frame structures offer advantages such as factory prefabrication of beams and columns, high construction efficiency, and wide applicability. The safety of the connection methods between precast components at the joints of precast concrete frame structures is crucial for good seismic performance. However, current research mainly focuses on precast monolithic structures, including: rebar anchorage or lap splices, grouting sleeve connections, welding connections, bolted connections, and prestressed connections. Among these, rebar anchorage or lap splices offer good overall integrity, but the dense rebar in the core area of ​​the joint makes it difficult to ensure the quality of concrete pouring; grouting sleeve connections are mature and widely used, but require quality inspection of the sleeve connections; welding connections eliminate the need for on-site pouring, shortening the construction period, but require a high level of welding skill to ensure weld quality; bolted connections are convenient to install, but require high precision in component fabrication, processing, and installation; prestressed connections improve the strength, stiffness, and resilience of the joint, but have slightly lower energy dissipation capacity.

[0003] Common connection methods for fully prefabricated structures include bolted connections, welding, post-tensioned prestressed tendons, and pin connections. These methods not only shorten the construction cycle but also optimize the design of dry connection nodes. After an earthquake, only damaged components need to be repaired or replaced, which is convenient, quick, and saves manpower and resources. Among these, the pin is a standardized fastener that, when connected to the lug plate to form an assembly, can transfer shear force and bending moment in the node, ensuring reliable operation and easy disassembly. Therefore, developing a precast concrete cross joint using pin connections is of great significance for the engineering application of prefabricated structures. Summary of the Invention

[0004] To address the problems existing in existing prefabricated monolithic frame nodes and fully prefabricated frame nodes, a precast concrete cross node using pin connections is proposed. This node employs a purely dry connection method, which is convenient and quick to install, thus shortening the construction period.

[0005] To achieve the above objectives, the technical solution provided by this invention is as follows:

[0006] A precast concrete cross joint using a pin connection includes a column and a crossbeam connected to the column. Multiple beam end lugs are fixed to the end of the crossbeam facing the column, and these lugs are evenly distributed along the length of the column. A first column side lug and a second column side lug are fixed to the column on either side of the beam end lugs, respectively. A pin passes through the first column side lug, the second column side lug, and the beam end lugs to connect the crossbeam and the column. A sliding hole is concentrically formed inside the pin, and a sliding rod is elastically slidably connected within the sliding hole. A fixing block is fixed to the outer edge of the pin, and a receiving groove is formed on the fixing block. A sliding groove communicating with the sliding hole is formed on the pin, and a sliding block is slidably connected within the sliding groove. The sliding block can enter the receiving groove, and the sliding block is fixedly connected to the sliding rod. The pin shaft has a concentric groove, and a rope-winding wheel is rotatably connected in the groove. The slide rod passes through the rope-winding wheel and has a spiral groove. A ball is rotatably connected in the rope-winding wheel and is located in the spiral groove. The slide rod, the spiral groove, the rope-winding wheel, and the ball constitute a ball screw pair. The pin shaft on both sides of the groove has a locking hole, which is connected to the slide hole. An inclined locking block is rotatably installed in the locking hole. A steel rope is fixed to the end of the locking block facing the pin shaft axis. The steel rope is fixedly connected to the outer edge of the rope-winding wheel. When the slider drives the slide rod to move towards the storage groove, the rope-winding wheel can rotate in the groove and wind the steel rope. The first column side lug is equipped with a locking device that can lock the fixing block and the slider located in the storage groove.

[0007] Specifically, the locking device includes a slot formed on the side of the first post side ear away from the second post side ear. The slot communicates with the inner hole of the first post side ear. A locking tongue is elastically slidably connected to the first post side ear on one side of the slot. The sliding direction of the locking tongue is perpendicular to the axial direction of the inner hole of the first post side ear.

[0008] Specifically, the first post side lug is provided with a guide groove that communicates with the slot on the side away from the second post side lug. The locking tongue is slidably engaged in the guide groove. The locking tongue is connected to the bottom of the guide groove by a first spring. The end of the locking tongue away from the bottom of the guide groove is arc-shaped.

[0009] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0010] 1. This invention does not require the use of tools during the installation of the pin and can be installed by hand. After the fixing block and the slider located in the placement groove are locked in the slot by the locking tongue, the end of the locking block away from the pin shaft protrudes to the outside of the pin. Under the blocking action of the locking tongue and the locking block, the pin can be prevented from falling off.

[0011] 2. The columns and beams are directly assembled and connected on-site using pins, eliminating the need for secondary on-site pouring. This not only achieves the same structural strength requirements as cast-in-place concrete but also shortens the construction period. It enables prefabrication of beams and columns, ensuring component quality and realizing green building practices. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the present invention.

[0013] Figure 2 for Figure 1 A magnified view of region A in the middle.

[0014] Figure 3 This is a schematic diagram showing the engagement of the locking block and the second column side lug after the pin is installed.

[0015] Figure 4 for Figure 3 A magnified view of region B in the middle.

[0016] Figure 5 This is a schematic diagram showing the connection between the steel reinforcement inside the beam and the steel plate at the beam end.

[0017] Figure 6 This is a schematic diagram of the slot on the side lug of the first post.

[0018] Figure 7 for Figure 6 A magnified view of region C in the middle.

[0019] Figure 8 This is a schematic diagram of a pin.

[0020] Figure 9 for Figure 8 A schematic diagram of region D in the middle.

[0021] Figure 10 This is a partial sectional view of the pin.

[0022] Figure 11 This is a schematic diagram of the cross-sectional structure of the pin.

[0023] The names of the components in the attached diagram are:

[0024] 1. Column; 2. First column side lug; 201. Second column side lug; 3. Horizontal beam; 4. Beam end steel plate; 401. Column top steel plate; 5. Beam internal reinforcement; 6. Beam end lug; 7. Slot; 701. Guide groove; 8. Locking tongue; 9. First spring; 10. Pin; 11. Slide groove; 12. Slide hole; 13. Slide rod; 14. Spiral groove; 15. Sliding block; 16. Fixing block; 161. Storage groove; 17. Rope winding wheel; 18. Rotating shaft; 19. Locking block; 20. Steel rope; 21. Locking hole; 22. Second spring. Detailed Implementation

[0025] like Figures 1-11 As shown, a precast concrete cross joint using pin connections includes a column 1 and a crossbeam 3 connected to the column 1. The column 1 is perpendicular to the crossbeam 3, and a crossbeam 3 is connected to both sides of the column 1. Reinforcing bars 5 are inserted through the crossbeam 3.

[0026] Multiple beam end lugs 6 are fixed to the end of the crossbeam 3 facing the column 1, and the multiple beam end lugs 6 are evenly distributed along the length of the column 1. A first column side lug 2 and a second column side lug 201 are fixed on the column 1 on both sides of the beam end lug 6, respectively. A pin 10 passes through the first column side lug 2, the second column side lug 201 and the beam end lug 6 to connect the crossbeam 3 and the column 1.

[0027] The beam end lug 6 is fixedly connected to the beam end steel plate 4, which is fixed to the end of the crossbeam 3. The reinforcing bars 5 inside the beam are fixedly connected to the beam end steel plate 4. At least two beam end lugs 6 are provided on the beam end steel plate 4.

[0028] The first column side lug 2 and the second column side lug 201 are fixed to the column steel plate 401. The column steel plate 401 is fixedly connected to the reinforcing bars inside the column 1. The column steel plate 401 and the column 1 are integrally cast.

[0029] A sliding hole 12 is concentrically formed inside the pin 10, and a sliding rod 13 is slidably connected inside the sliding hole 12. The sliding rod 13 is connected to the pin 10 by a second spring 22. A fixing block 16 is fixed on the outer edge of the pin 10, and a receiving groove 161 is formed on the fixing block 16. A sliding groove 11 communicating with the sliding hole 12 is formed on the pin 10, and a slider 15 is slidably connected inside the sliding groove 11. The slider 15 can enter the receiving groove 161. The slider 15 is fixedly connected to the sliding rod 13. During the movement of the slider 15 into the receiving groove 161, the second spring 22 is compressed.

[0030] A concentric groove is formed inside the pin 10, and a rope-winding wheel 17 is rotatably connected within the groove. A sliding rod 13 passes through the rope-winding wheel 17. A helical groove 14 is formed on the sliding rod 13, and a ball bearing is rotatably connected within the rope-winding wheel 17. The ball bearing is located within the helical groove 14. The sliding rod 13, its helical groove 14, the rope-winding wheel 17, and the ball bearing constitute a ball screw pair. A locking hole 21 is formed on both sides of the pin 10, communicating with the sliding hole 12. An inclined locking block 19 is rotatably mounted within the locking hole 21, and the locking block 19 is rotatably connected within the locking hole 21 via a rotating shaft 18. A steel rope 20 is fixed to the end of the locking block 19 facing the axis of the pin 10, and the steel rope 20 is fixedly connected to the outer edge of the rope-winding wheel 17.

[0031] As the slider 15 drives the slide bar 13 to move toward the storage groove 161, the rope wheel 17 can rotate in the groove and wind the steel rope 20.

[0032] The first post-side lug 2 is provided with a locking device capable of locking the fixing block 16 and the slider 15 located in the storage groove 161. The locking device includes a slot 7 formed on the side of the first post-side lug 2 away from the second post-side lug 201, and the slot 7 communicates with the inner hole of the first post-side lug 2. A locking tongue 8 is elastically slidably connected to the first post-side lug 2 on one side of the slot 7, and the sliding direction of the locking tongue 8 is perpendicular to the axial direction of the inner hole of the first post-side lug 2.

[0033] The first post-side lug 2 has a guide groove 701 on the side away from the second post-side lug 201, which communicates with the slot 7. The locking tongue 8 is slidably engaged in the guide groove 701, and the locking tongue 8 is connected to the bottom of the guide groove 701 by a first spring 9. The end of the locking tongue 8 away from the bottom of the guide groove 701 is arc-shaped.

[0034] When connecting the crossbeam 3 to the column 1, place the beam end lug 6 between the first column side lug 2 and the second column side lug 201. Then, insert the end of the pin 10 away from the fixing block 16 through the first column side lug 2, the beam end lug 6, and the second column side lug 201 in sequence, aligning the fixing block 16 with the slot 7. As the pin 10 is inserted, the slider 15 first enters the slot 7 and is blocked by the first column side lug 2. As the pin 10 continues to be inserted, the fixing block 16 moves into the slot 7, and the slider 15 gradually approaches the fixing block 16. As the fixing block 16 continues to move towards the slot 7, when the fixing block 16 contacts the arc-shaped end of the locking tongue 8, the locking tongue 8 moves away from the fixing block 16 under the guidance of the arc-shaped end of the locking tongue 8. At the same time, the first spring 9 is compressed.

[0035] After the slider 15 enters the receiving slot 161, the fixing block 16 enters the retaining slot 7, and the fixing block 16 and the locking tongue 8 are interleaved. After the fixing block 16 and the locking tongue 8 are interleaved, under the elastic force of the first spring 9, the locking tongue 8 moves inward toward the inside of the retaining slot 7. After the locking tongue 8 moves inward toward the inside of the retaining slot 7, the locking tongue 8 locks the fixing block 16 and the slider 15 in the retaining slot 7.

[0036] After the slider 15 is blocked by the first post side lug 2, as the pin 10 is continuously inserted, the slider 15 and the slide rod 13 move relative to the pin 10 along the axial direction of the pin 10 and compress the second spring 22. During the movement of the slide rod 13, the rope wheel 17 rotates and winds the steel rope 20 under the guiding action of the spiral groove 14 on the slide rod 13 on the ball bearings inside the rope wheel 17. As the steel rope 20 is wound by the rope wheel 17, the locking block 19 tends to be perpendicular to the axis of the pin 10. As the pin 10 is continuously inserted, when the locking block 19 passes through the second post side lug 201, the end of the locking block 19 away from the axis of the pin 10 protrudes outward from the outside of the pin 10. At the same time, the fixing block 16 and the slider 15 are locked in the slot 7 by the locking tongue 8. With the locking action of the locking tongue 8 on the fixing block 16 and the slider 15, and the blocking action of the second column side lug 201 on the part of the locking block 19 protruding to the outside of the pin 10, the pin 10 can be effectively prevented from coming out of the first column side lug 2, the second column side lug 201 and the beam end lug 6.

[0037] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A precast concrete cross joint using pin connections, comprising a column (1) and a crossbeam (3) connected to the column (1), characterized in that, Multiple beam end lugs (6) are fixed to the end of the beam (3) facing the column (1). The first column side lug (2) and the second column side lug (201) are fixed on the columns (1) on both sides of the beam end lug (6). The pin (10) passes through the first column side lug (2), the second column side lug (201) and the beam end lug (6). A sliding hole (12) is opened in the pin (10). A sliding rod (13) is elastically slidably connected in the sliding hole (12). The outer edge of the pin (10) A fixing block (16) is fixed on the top, and a storage groove (161) is provided on the fixing block (16). A sliding groove (11) communicating with the sliding hole (12) is provided on the pin (10). A slider (15) is slidably connected in the sliding groove (11). The slider (15) can enter the storage groove (161). The slider (15) is fixedly connected to the sliding rod (13). A wheel groove is provided in the pin (10). A winding wheel (17) is rotatably connected in the wheel groove. The sliding rod (13) passes through the winding wheel. The pulley (17) and slide bar (13) have spiral grooves (14) on them. A ball is rotatably connected inside the pulley (17). The ball is located inside the spiral groove (14). The slide bar (13), its spiral groove (14), the pulley (17), and the ball constitute a ball screw pair. The pins (10) on both sides of the groove have locking holes (21) on them. The locking holes (21) are connected to the slide hole (12). An inclined locking block (19) is rotatably installed inside the locking hole (21). 19) A steel rope (20) is fixed at one end facing the shaft of the pin (10). The steel rope (20) is fixedly connected to the outer edge of the winding wheel (17). During the process of the slider (15) driving the slide rod (13) to move towards the storage groove (161), the winding wheel (17) can rotate in the groove and wind the steel rope (20). The first column side lug (2) is provided with a locking device that can lock the fixing block (16) and the slider (15) located in the storage groove (161).

2. The precast concrete cross joint using pin connection according to claim 1, characterized in that, The locking device includes a slot (7) formed on the side of the first post side ear (2) away from the second post side ear (201). The slot (7) communicates with the inner hole of the first post side ear (2). A locking tongue (8) is elastically slidably connected to the first post side ear (2) on one side of the slot (7). The sliding direction of the locking tongue (8) is perpendicular to the axial direction of the inner hole of the first post side ear (2).

3. The precast concrete cross joint using pin connection according to claim 2, characterized in that, The first post side lug (2) has a guide groove (701) that communicates with the slot (7) on the side away from the second post side lug (201). The locking tongue (8) is slidably engaged in the guide groove (701). The locking tongue (8) is connected to the bottom of the guide groove (701) by a first spring (9). The end of the locking tongue (8) away from the bottom of the guide groove (701) is arc-shaped.

4. The precast concrete cross joint using pin connection according to claim 1, characterized in that, The slide bar (13) is connected to the pin (10) by a second spring (22). During the movement of the slider (15) into the receiving groove (161), the second spring (22) is compressed.

5. A precast concrete cross joint using pin connection according to claim 1, characterized in that, The multiple beam end lugs (6) are evenly distributed along the length of the column (1). The beam end lugs (6) are fixedly connected to the beam end steel plate (4). The beam end steel plate (4) is fixed at the end of the crossbeam (3). The steel bars (5) inside the beam are fixedly connected to the beam end steel plate (4). At least two beam end lugs (6) are provided on the beam end steel plate (4). The first column side lug (2) and the second column side lug (201) are fixed to the column steel plate (401). The column steel plate (401) is fixedly connected to the steel bars inside the column (1). The column steel plate (401) and the column (1) are integrally cast.

6. The precast concrete cross joint using pin connection according to claim 1, characterized in that, The column (1) is perpendicular to the crossbeam (3), and a crossbeam (3) is connected to both sides of the column (1).

7. A precast concrete cross joint using pin connection according to claim 1, characterized in that, The card block (19) is rotatably connected to the card hole (21) via a rotating shaft (18).

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