Steel bar connecting structure for assembly type hollow slab bridge

Abstract

The utility model discloses a steel bar connecting structure for an assembly type hollow slab bridge. The steel bar connecting structure is used for connecting a first hollow slab bridge and a second hollow slab bridge. Comprising a first connecting base arranged on the side portion of a first hollow slab bridge and a second connecting base arranged on the side portion of a second hollow slab bridge, the first connecting base is fixedly connected with a first steel bar, and the other end of the first steel bar is connected with a first connecting piece; the second connecting seat is fixedly connected with a second steel bar, and the other end of the second steel bar is connected with a second connecting piece; a first connecting part is arranged at one end of the first connecting piece, a second connecting part connected with the first connecting part is arranged at one end of the second connecting piece, a lock pin is arranged in the first connecting part and the second connecting part in a penetrating mode, and the first connecting part and the second connecting part are connected through the lock pin. By means of mechanical meshing of the rib lines and the grooves, the section of the steel bar is prevented from being weakened, structural safety is guaranteed, and meanwhile the steel bar connecting structure has the advantages of being easy and convenient to operate and convenient to disassemble and maintain and is high in universality and flexibility.

Description

Technical Field

[0001] This utility model belongs to the field of building engineering technology, and in particular relates to a steel reinforcement connection structure for prefabricated hollow slab bridges. Background Technology

[0002] In modern bridge construction, prefabricated hollow slab bridges have been widely used due to their advantages such as convenient construction and controllable costs. However, the steel reinforcement connection technology between hollow slab bridges still faces many issues that need optimization in practical engineering applications. Traditional steel reinforcement connection methods, such as welding and tying, have shown certain applicability in long-term engineering practice, but have also gradually revealed some limitations. For example, welding requires high levels of operational skills and equipment, and field operations are constrained by factors such as power supply and environmental climate, which may affect the stability of welding quality. At the same time, local heating of the steel reinforcement during welding may cause changes in its properties, potentially affecting the structural durability. Tying connection technology has certain advantages in terms of construction convenience, but under conditions of large dynamic loads or impact loads, its connection strength may not be able to fully meet the stress requirements of the bridge, posing a risk of loosening and a potential challenge to the safety of the bridge structure. Chinese utility model patent CN219261530U discloses a rebar connector, including a first connector, a second connector, and a connecting sleeve. The first connector, second connector, and connecting sleeve are all through-type structures at both ends. One end of the connecting sleeve is slidably connected to the first connector, which penetrates the connecting sleeve and has one end located outside the connecting sleeve. The other end of the connecting sleeve is provided with a detachable second connector, which is used to press the first connector against the connecting sleeve. However, this connector uses a threaded connection method, which may reduce the effective cross-sectional area of ​​the rebar in practical applications, thus affecting the structural safety performance. Furthermore, the thread processing technology is complex and has limitations in adaptability to connecting rebars of different specifications. Utility Model Content

[0003] The purpose of this invention is to provide a steel reinforcement connection structure for prefabricated hollow slab bridges. This invention, through the mechanical interlocking of ribs and grooves, avoids weakening of the steel reinforcement cross-section, ensuring structural safety. It also has the advantages of simple operation and convenient disassembly and maintenance, and possesses strong versatility and flexibility.

[0004] The technical solution of this utility model is as follows: A steel reinforcement connection structure for prefabricated hollow slab bridges, used for connecting a first hollow slab bridge and a second hollow slab bridge; it includes a first connecting seat disposed on the side of the first hollow slab bridge and a second connecting seat disposed on the side of the second hollow slab bridge. A first steel bar is fixedly connected to the first connecting seat, and the other end of the first steel bar is connected to a first connector; the first steel bar has a first transverse rib extending spirally along the axis and a first longitudinal rib extending linearly along the axis; the first connector has a first spiral groove cooperating with the first transverse rib and a first straight groove cooperating with the first longitudinal rib; a second steel bar is fixedly connected to the second connecting seat, and the other end of the second steel bar is connected to a second connector; the second steel bar has a second transverse rib extending spirally along the axis and a second longitudinal rib extending linearly along the axis; the second connector has a second spiral groove cooperating with the second transverse rib and a second straight groove cooperating with the second longitudinal rib; one end of the first connector is provided with a first connecting portion, and one end of the second connector is provided with a second connecting portion connected to the first connecting portion; a locking pin passes through the first connecting portion and the second connecting portion, and the first connecting portion and the second connecting portion are connected by the locking pin.

[0005] In the aforementioned prefabricated hollow slab bridge steel reinforcement connection structure, the first connecting seat includes a first base plate bolted to the first hollow slab bridge, a first connecting cylinder fitted with the first steel reinforcement, and a first axial through-slit; the first axial through-slit is provided with a first fastening connection part on both sides, and the first fastening connection part is reinforced by bolts to strengthen the connection between the first steel reinforcement and the first connecting seat.

[0006] In the aforementioned prefabricated hollow slab bridge steel reinforcement connection structure, the first connecting cylinder has a third spiral groove that cooperates with the first transverse rib and a third straight groove that cooperates with the first longitudinal rib.

[0007] In the aforementioned prefabricated hollow slab bridge steel reinforcement connection structure, the second connecting seat includes a second base plate bolted to the second hollow slab bridge, a second connecting cylinder fitted with the second steel reinforcement, and a second axial through-slot; the second axial through-slot is provided with a second fastening connection part on both sides, and the second fastening connection part is reinforced by bolts to strengthen the connection between the second steel reinforcement and the second connecting seat.

[0008] In the aforementioned prefabricated hollow slab bridge steel reinforcement connection structure, the second connecting cylinder has a fourth spiral groove that cooperates with the second transverse ribs and a fourth straight groove that cooperates with the second longitudinal ribs.

[0009] In the aforementioned prefabricated hollow slab bridge steel reinforcement connection structure, the other end of the first connector is provided with a third connecting cylinder that fits with the first steel reinforcement, and the first spiral groove and the first straight groove are provided in the third connecting cylinder; the side wall of the third connecting cylinder is provided with a third axial through-slit, and the two sides of the third slit are provided with a third fastening connection part, and the third fastening connection part is reinforced by bolts to strengthen the connection between the first steel reinforcement and the first connector.

[0010] In the aforementioned prefabricated hollow slab bridge steel reinforcement connection structure, the other end of the second connector is provided with a fourth connecting cylinder that fits with the second steel reinforcement, and the second spiral groove and the second straight groove are provided inside the fourth connecting cylinder; the side wall of the fourth connecting cylinder is provided with a fourth axial through slot, and the two sides of the fourth slot are provided with a fourth fastening connection part, and the fourth fastening connection part is reinforced by bolts to strengthen the connection between the second steel reinforcement and the second connector.

[0011] In the aforementioned prefabricated hollow slab bridge steel reinforcement connection structure, the first connection part is provided with a first through hole, and the second connection part is provided with a second through hole corresponding to the first through hole. The locking pin passes through the first through hole and the second through hole.

[0012] In the aforementioned prefabricated hollow slab bridge steel reinforcement connection structure, the locking pin has an extended and bent portion that fits with the side portions of the first and second connecting portions.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] This invention utilizes the transverse ribs (first transverse ribs / second transverse ribs) of the reinforcing bar to form a radial engagement with the spiral grooves (first spiral grooves / second spiral grooves) of the connector, and the longitudinal straight ribs (first longitudinal ribs / second longitudinal ribs) to form an axial limit with the straight grooves (first straight grooves / second straight grooves). Furthermore, a locking pin engages with the curved portion of the connecting part (first connecting part / second connecting part) to further lock lateral displacement, preventing loosening and ensuring the strength and stability of the connection structure. This invention uses the connecting seat (first connecting seat / second connecting seat) to be fixed to the hollow slab bridge with bolts, and the connector (first connecting part / second connecting part) to the reinforcing bar (first reinforcing bar / second reinforcing bar) to be fastened with bolts through a slotted structure (first slot / second slot). This simplifies the operation process, reduces on-site welding or complex binding work, and lightens the workload of workers. Furthermore, this utility model allows for the release of the connecting cylinder from the reinforcing bar by loosening the bolts of the fastening connection, and the separation of the first connecting piece from the second connecting piece by pulling out the locking pin. This achieves non-destructive disassembly, facilitates the replacement of local components during bridge maintenance, and has strong versatility and flexibility, thereby reducing maintenance costs. Attached Figure Description

[0015] Figure 1This is the front view of this utility model;

[0016] Figure 2 This is a schematic diagram illustrating the application of this utility model;

[0017] Figure 3 This is a partial view A of the present invention;

[0018] Figure 4 This is a partial view B of the present invention;

[0019] Figure 5 This is a cross-sectional view of the present invention;

[0020] Figure 6 This is a longitudinal sectional view of the present invention;

[0021] Figure 7 This is an exploded view of the first and second connectors of this utility model.

[0022] The labels in the attached drawings are as follows: 1. First hollow slab bridge; 2. Second hollow slab bridge; 3. First reinforcing bar; 4. Second reinforcing bar; 5. First connecting seat; 501. First base plate; 502. First connecting cylinder; 503. First slot; 504. First fastening connection part; 6. Second connecting seat; 601. Second base plate; 602. Second connecting cylinder; 603. Second slot; 604. Second fastening connection part; 7. First connecting piece; 701. Third connecting cylinder; 702. Third slot; 703. Third fastening connection part; 8. Second connecting piece; 801. 802. Fourth connecting cylinder; 803. Fourth slit; 804. Fourth fastening connection part; 9. First connecting part; 905. First through hole; 10. Second connecting part; 1006. Second through hole; 11. Locking pin; 12. Curved part; 13. First transverse rib; 14. First longitudinal rib; 15. Second transverse rib; 16. Second longitudinal rib; 17. First spiral groove; 18. Second spiral groove; 19. Third spiral groove; 20. Fourth spiral groove; 21. First straight groove; 22. Second straight groove; 23. Third straight groove; 24. Fourth straight groove. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present invention.

[0024] Example: A steel reinforcement connection structure for prefabricated hollow slab bridges, such as... Figure 1 As shown, this structure is mainly used for the connection between the first hollow slab bridge 1 and the second hollow slab bridge 2, such as... Figure 2 As shown. This structure includes a first connecting seat 5 disposed on the side of the first hollow slab bridge 1 and a second connecting seat 6 disposed on the side of the second hollow slab bridge 2, as shown. Figure 3 and Figure 4As shown, a first reinforcing bar 3 is fixedly connected to the first connecting seat 5, and a first connecting piece 7 is connected to the other end of the first reinforcing bar 3. Figure 5 and Figure 6 As shown, the first reinforcing bar 3 has a first transverse rib 13 extending spirally along the axis and a first longitudinal rib 14 extending linearly along the axial direction; the first connector 7 has a first spiral groove 17 that mates with the first transverse rib 13 and a first linear groove 21 that mates with the first longitudinal rib 14; the second reinforcing bar 4 has a second transverse rib 15 extending spirally along the axis and a second longitudinal rib 16 extending linearly along the axial direction; the second reinforcing bar 4 is fixedly connected to the second connecting seat 6, and the other end of the second reinforcing bar 4 is connected to the second connector 8; the second connector 8 has a second spiral groove 18 that mates with the second transverse rib 15 and a second linear groove 22 that mates with the second longitudinal rib 16. Figure 7The first connecting member 7 shown has a first connecting part 9 at one end, and the second connecting member 8 has a second connecting part 10 at one end that connects to the first connecting part 9. A locking pin 11 passes through the first connecting part 9 and the second connecting part 10, and the first connecting part 9 and the second connecting part 10 are connected by the locking pin 11. The first connecting seat 5 includes a first base plate 501 bolted to the first hollow slab bridge 1, a first connecting cylinder 502 that fits with the first reinforcing bar 3, and a first slot 503 that passes through along the axial direction; the first slot 503 has a first fastening connecting part 504 on both sides, and the first fastening connecting part 504 is bolted to reinforce the connection between the first reinforcing bar 3 and the first connecting seat 5. The first connecting cylinder 502 has a third spiral groove 19 that matches the first transverse rib 13 and a third straight groove 23 that matches the first longitudinal rib 14. The second connecting seat 6 includes a second base plate 601 bolted to the second hollow slab bridge 2, a second connecting cylinder 602 fitted with the second reinforcing bar 4, and a second slit 603 extending axially. Second fastening connection parts 604 are provided on both sides of the second slit 603, and the second fastening connection parts 604 are bolted to reinforce the connection between the second reinforcing bar 4 and the second connecting seat 6. The second connecting cylinder 602 has a fourth spiral groove 20 that engages with the second transverse rib 15 and a fourth straight groove 24 that engages with the second longitudinal rib 16. The other end of the first connecting member 7 is provided with a third connecting cylinder 701 fitted with the first reinforcing bar 3. The first spiral groove 17 and the first straight groove 21 are located within the third connecting cylinder 701. A third slit 702 extending axially is provided on the side wall of the third connecting cylinder 701, and third fastening connection parts 703 are provided on both sides of the third slit 702. The third fastening connection parts 703 are bolted to reinforce the connection between the first reinforcing bar 3 and the first connecting member 7. The other end of the second connecting member 8 is provided with a fourth connecting cylinder 801 that fits with the second reinforcing bar 4. The second spiral groove 18 and the second straight groove 22 are provided inside the fourth connecting cylinder 801. The side wall of the fourth connecting cylinder 801 is provided with a fourth axially penetrating slit 802. The two sides of the fourth slit 802 are provided with fourth fastening connection parts 803. The fourth fastening connection parts 803 are bolted to reinforce the connection between the second reinforcing bar 4 and the second connecting member 8. The first connecting part 9 is provided with a first through hole 901. The second connecting part 10 is provided with a second through hole 1001 corresponding to the first through hole 901. The locking pin 11 passes through the first through hole 901 and the second through hole 1001. The locking pin 11 has an extended and bent curved part 12 that fits with the side of the first connecting part 9 and the second connecting part 10. The first base plate 501 and the second base plate 601 serve as the mounting base plates for the first connecting seat 5 and the second connecting seat 6, respectively, along with the first hollow plate bridge 1 and the second hollow plate bridge 2. Modular positioning is achieved through bolts, allowing for fine-tuning of the position within a range of ±15mm during construction.The first connecting sleeve 502 and the third connecting sleeve 701 are cylindrical sleeves that fit with the end of the first reinforcing bar 3. The inner wall is machined with a first spiral groove 17, a first straight groove 21, a third spiral groove 19, and a third straight groove 23, so that the first transverse rib 13 of the first reinforcing bar 3 can be embedded in the first spiral groove 17 and the second spiral groove 18, and the first longitudinal rib 14 of the first reinforcing bar 3 can be embedded in the first straight groove 21 and the third straight groove 23. Through the first slit 503 and the third slit 702, controllable plastic deformation is generated when the bolt is pressed, forming an interference fit with the first reinforcing bar 3. The second connecting sleeve 602 and the fourth connecting sleeve 801 are cylindrical sleeves that fit into the ends of the second reinforcing bar 4. The inner walls are machined with a second spiral groove 18, a second straight groove 22, a fourth spiral groove 20, and a fourth straight groove 24, allowing the second transverse ribs 15 of the second reinforcing bar 4 to be embedded in the second spiral grooves 18 and 20, and the second longitudinal ribs 16 to be embedded in the second straight grooves 22 and 24. Through the second slit 603 and the fourth slit 802, controllable plastic deformation occurs when the bolts are applied, forming an interference fit with the second reinforcing bar 4. An axially penetrating slit is opened on the side wall of the connecting sleeve, giving it elastic shrinkage capability. Combined with the bolts tightening the connection, radial pressure is applied, achieving a weld-free mechanical locking mechanism. The initial slit width is 2-3 mm, shrinking to 0.5-1 mm after bolt pressure, making the inner diameter of the connecting sleeve 0.1-0.2 mm smaller than the diameter of the reinforcing bar, generating a strain of 0.05-0.1 mm / mm, forming a durable frictional constraint. The first connecting part 9 and the second connecting part 10 are respectively fixed to the plate-like structures at the ends of the first connecting member 7 and the second connecting member 8. They engage with the locking pin 11 through the first through hole 901 and the second through hole 1001 to form a detachable hinged joint. The locking pin 11 is a cylindrical pin that passes through the first connecting part 9 and the second connecting part 10, bearing the shear force and bending moment of the connecting joint. The L-shaped bend at the end of the locking pin 11 forms a three-dimensional mechanical interlock with the sidewalls of the first connecting part 9 and the second connecting part 10, restricting axial displacement. The inner diameter of the first through hole 901 and the second through hole 1001 is 0.5 mm larger than the diameter of the locking pin 11, allowing for small angle deflections (≤3°) to accommodate bridge flexural deformation, while the rigid limit of the curved part 12 prevents detachment.

[0025] This invention utilizes the transverse ribs of the reinforcing bars (first transverse rib 13 / second transverse rib 15) to form a radial engagement with the spiral grooves of the connectors (first spiral groove 17 / second spiral groove 18), and the longitudinal straight ribs (first longitudinal rib 14 / second longitudinal rib 16) to form an axial limit with the straight grooves (first straight groove 21 / second straight groove 22). Furthermore, the locking pin 11 engages with the curved portion 12 of the connecting part (first connecting part 9 / second connecting part 10) to further lock lateral displacement, prevent loosening of the connection, and ensure the strength and firmness of the connection structure. This invention uses connecting seats (first connecting seat 5 / second connecting seat 6) to be fixed to the hollow plate bridge with bolts, and connecting parts (first connecting parts 7 / second connecting parts 8) to the reinforcing bars (first reinforcing bar 3 / second reinforcing bar 4) to be fastened with bolts through a slotted structure (first slot 503 / second slot 603). This simplifies the operation process, reduces on-site welding or complex binding operations, and lightens the workload of workers. Furthermore, this utility model allows the connecting cylinder to release the steel bar by loosening the bolts of the fastening connection part, and the first connecting piece 7 and the second connecting piece 8 can be separated by pulling out the locking pin 11, achieving non-destructive disassembly. This facilitates the replacement of local components during bridge maintenance, has strong versatility and flexibility, and can reduce maintenance costs.

[0026] Work process

[0027] The first connecting seat 5 is bolted to the side of the first hollow slab bridge 1 using the first base plate 501. The reinforcing bars are pre-cut to a specified length, and the end of the first reinforcing bar 3 is embedded into the first connecting cylinder 502. Then, pressure is applied through the bolts of the first fastening connection parts 504 on both sides of the first slot 503 to cause plastic deformation of the first connecting cylinder 502, forming an interference fit. The second connecting seat 6 is bolted to the side of the precast second hollow slab bridge 2 using the second base plate 601. The end of the second reinforcing bar 4 is embedded into the second connecting cylinder 602. Then, pressure is applied through the bolts of the second fastening connection parts 604 on both sides of the second slot 603 to cause plastic deformation of the second connecting cylinder 602, forming an interference fit. The third connecting cylinder 701 is fixed to the other end of the first reinforcing bar 3. Then, pressure is applied through the bolts of the third fastening connection parts 703 on both sides of the third slot 702 to cause plastic deformation of the third connecting cylinder 701, forming an interference fit. The fourth connecting cylinder 801 is fixed to the other end of the second reinforcing bar 4. Then, pressure is applied by the bolts of the fourth fastening connection parts 803 on both sides of the fourth slot 802 to cause the fourth connecting cylinder 801 to undergo plastic deformation, forming an interference fit. The through holes of the first connecting part 9 and the second connecting part 10 are coaxially aligned, and the locking pin 11 is inserted, so that the curved part 12 of the locking pin 11 forms a three-dimensional mechanical interlock with the side walls of the first connecting part 9 and the second connecting part 10, completely eliminating the axial displacement degree of freedom.

[0028] In summary, this utility model can prevent the weakening of the steel bar cross section through the mechanical interlocking of the ribs and grooves, thus ensuring structural safety. It also has the advantages of simple operation and convenient disassembly and maintenance, and is highly versatile and flexible.

Claims

1. A prefabricated hollow slab bridge steel bar connecting structure for connecting between a first hollow slab bridge (1) and a second hollow slab bridge (2); characterized in that: The system includes a first connecting seat (5) located on the side of the first hollow slab bridge (1) and a second connecting seat (6) located on the side of the second hollow slab bridge (2). A first reinforcing bar (3) is fixedly connected to the first connecting seat (5), and a first connecting member (7) is connected to the other end of the first reinforcing bar (3). The first reinforcing bar (3) has a first transverse rib (13) extending spirally along the axis and a first longitudinal rib (14) extending linearly along the axis. The first connecting member (7) has a first spiral groove (17) that mates with the first transverse rib (13) and a first straight groove (21) that mates with the first longitudinal rib (14). A second reinforcing bar (4) is fixedly connected to the second connecting seat (6), and the other end of the second reinforcing bar (4) is connected to the first connecting seat (5). The first connector (7) is connected to the second connector (8); the second steel bar (4) has a second transverse rib (15) extending spirally along the axis and a second longitudinal rib (16) extending straight along the axis; the second connector (8) has a second spiral groove (18) that cooperates with the second transverse rib (15) and a second straight groove (22) that cooperates with the second longitudinal rib (16); one end of the first connector (7) is provided with a first connecting part (9), and one end of the second connector (8) is provided with a second connecting part (10) that connects to the first connecting part (9); a locking pin (11) passes through the first connecting part (9) and the second connecting part (10), and the first connecting part (9) and the second connecting part (10) are connected by the locking pin (11).

2. The prefabricated hollow slab bridge reinforcing bar connecting structure according to claim 1, characterized in that: The first connecting seat (5) includes a first base plate (501) bolted to the first hollow slab bridge (1), a first connecting cylinder (502) fitted to the first reinforcing bar (3), and a first slot (503) penetrating along the axial direction; the first slot (503) is provided with a first fastening connection part (504) on both sides, and the first fastening connection part (504) is bolted to reinforce the connection between the first reinforcing bar (3) and the first connecting seat (5).

3. The prefabricated hollow slab bridge reinforcing bar connecting structure according to claim 2, characterized in that: The first connecting cylinder (502) has a third spiral groove (19) that cooperates with the first transverse rib (13) and a third straight groove (23) that cooperates with the first longitudinal rib (14).

4. The prefabricated hollow slab bridge reinforcing bar connecting structure according to claim 1, characterized in that: The second connecting seat (6) includes a second base plate (601) bolted to the second hollow slab bridge (2), a second connecting cylinder (602) fitting with the second reinforcing bar (4), and a second slit (603) penetrating along the axial direction; the second slit (603) is provided with a second fastening connection part (604) on both sides, and the second fastening connection part (604) is bolted to reinforce the connection between the second reinforcing bar (4) and the second connecting seat (6).

5. The prefabricated hollow slab bridge reinforcing bar connecting structure according to claim 4, characterized in that: The second connecting cylinder (602) has a fourth spiral groove (20) that cooperates with the second transverse rib (15) and a fourth straight groove (24) that cooperates with the second longitudinal rib (16).

6. The prefabricated hollow slab bridge reinforcing bar connecting structure according to claim 1, characterized in that: The other end of the first connector (7) is provided with a third connecting cylinder (701) that fits with the first reinforcing bar (3). The first spiral groove (17) and the first straight groove (21) are provided in the third connecting cylinder (701). The side wall of the third connecting cylinder (701) is provided with a third axial through slot (702). The two sides of the third slot (702) are provided with a third fastening connection part (703). The third fastening connection part (703) is used to reinforce the connection between the first reinforcing bar (3) and the first connector (7) by bolts.

7. The prefabricated hollow slab bridge reinforcing bar connecting structure according to claim 1, characterized in that: The other end of the second connector (8) is provided with a fourth connecting cylinder (801) that fits with the second reinforcing bar (4). The second spiral groove (18) and the second straight groove (22) are provided inside the fourth connecting cylinder (801). The side wall of the fourth connecting cylinder (801) is provided with a fourth axial through slot (802). The sides of the fourth slot (802) are provided with a fourth fastening connection part (803). The fourth fastening connection part (803) is used to reinforce the connection between the second reinforcing bar (4) and the second connector (8) by bolts.

8. The prefabricated hollow slab bridge reinforcing bar connecting structure according to claim 1, characterized in that: The first connecting part (9) is provided with a first through hole (901), and the second connecting part (10) is provided with a second through hole (1001) corresponding to the first through hole (901). The locking pin (11) passes through the first through hole (901) and the second through hole (1001).

9. The prefabricated hollow slab bridge reinforcing bar connecting structure according to claim 8, characterized in that: The locking pin (11) has a curved portion (12) that extends and bends to fit the side portions of the first connecting portion (9) and the second connecting portion (10).

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