Transverse reinforcing and connecting device for prestressed concrete small box girder

Abstract

The utility model relates to a transverse reinforcing and connecting device for a small prestressed concrete box girder. At present, a wet joint area is easily damaged under the action of external force such as vehicle load and the like for a long time due to material characteristics and structure limitation, so that potential threats are caused to the stability and the service life of the whole small box girder structure. The device comprises a middle reinforcing mechanism and a plurality of side reinforcing mechanisms which are symmetrically arranged, fixing plates are arranged at the bottoms of the adjacent small box girders, one ends of the middle reinforcing mechanisms abut against the inner side walls between the adjacent small box girders and the bottoms of the wet joints, the other ends of the middle reinforcing mechanisms penetrate through the middles of the fixing plates, and rotating discs are connected to the bottoms of the middle reinforcing mechanisms; the multiple side edge reinforcing mechanisms abut against the outer side walls of the adjacent small box girders correspondingly and slidably penetrate through the two sides, close to the edge, of the fixing plate correspondingly, and the bottoms of the side edge reinforcing mechanisms are connected through prestressed steel beams. The structure of the adjacent small box girders can be more stable, and the service life of the small box girders can be prolonged.

Description

Technical Field

[0001] This utility model relates to the field of bridge reinforcement technology, specifically to a transverse reinforcement connection device for prestressed concrete small box girders. Background Technology

[0002] Prestressed concrete small box girders, with their unique box-section design, excellent load-bearing capacity, and significant advantages in resisting bending moments and shear forces, have become a widely adopted bridge structure in highway transportation infrastructure construction, demonstrating exceptional application value, especially in the construction of small and medium-span bridges. This structural form benefits from its efficient prefabrication production method, enabling the small box girders to be manufactured on a large scale and with precision in a factory environment, followed by convenient transportation to the construction site for rapid assembly. This process significantly reduces the construction cycle and effectively lowers the technical difficulty of construction.

[0003] However, in the actual construction practice of small box girders, how to stably connect two adjacent small box girder bodies has always been a key issue of close concern to industry professionals. Currently, wet joints, as the mainstream connection method, although meeting basic construction requirements to a certain extent, have inherent vulnerabilities that cannot be ignored. Due to material properties and structural limitations, wet joint areas are prone to damage under prolonged exposure to external forces such as vehicle loads, thus posing a potential threat to the stability and service life of the entire small box girder structure.

[0004] Therefore, there is an urgent need for a transverse reinforcement connection device that can make the structure of adjacent small box girders with wet joints more stable and improve the service life of the small box girders. Summary of the Invention

[0005] The purpose of this invention is to provide a transverse reinforcement connection device for prestressed concrete small box girders, so as to at least solve the problems of unstable structure and short service life of adjacent small box girders connected by wet joints.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] A transverse reinforcement connection device for prestressed concrete small box girder includes a central reinforcement mechanism and multiple symmetrically arranged side reinforcement mechanisms.

[0008] A fixing plate is provided at the bottom of adjacent small box girders. One end of the central reinforcement mechanism abuts against the inner side wall and the bottom of the wet joint between adjacent small box girders, and the other end passes through the middle of the fixing plate. A rotating disk is connected to the bottom of the central reinforcement mechanism.

[0009] Multiple side reinforcement mechanisms abut against the outer side walls of adjacent small box girders and slide through the fixed plate near the edges. The bottoms of the side reinforcement mechanisms are connected by prestressed steel strands.

[0010] Furthermore, the fixing plate has bolt holes in the middle and limit holes on both sides near the edge. Multiple fasteners are provided between the bolt holes and the limit holes.

[0011] Furthermore, the central reinforcement mechanism includes a trapezoidal plate, a fixed column, multiple connecting columns, and a screw rod. The top of the trapezoidal plate abuts against the bottom of the wet joint, and the two sides of the trapezoidal plate abut against the inner sidewalls of the adjacent small box girder. One end of the fixed column is located on the inner wall of the top of the trapezoidal plate, and the other end is connected to the screw rod. The bottom of the screw rod passes through the bolt hole and is located below the fixed plate. The bottom of the screw rod is connected to the rotating disk. The connecting columns are symmetrically connected between the fixed column and the two sides of the trapezoidal plate.

[0012] Furthermore, the connecting column is gradually inclined upward from the side wall of the fixed column to the inner walls of both sides of the trapezoidal plate.

[0013] Furthermore, the trapezoidal plate includes a horizontal plate and multiple side plates, the side plates being symmetrically and obliquely arranged below both sides of the horizontal plate, and the longitudinal section of the trapezoidal plate is trapezoidal.

[0014] Furthermore, the side reinforcement mechanism includes a limiting block, a connecting sleeve, a connecting rod, a fixing sleeve, and a stop plate. The limiting block is slidably disposed in the limiting hole, the connecting sleeve is disposed on the upper end face of the limiting block, the stop plate abuts against the outer wall of the small box girder, the fixing sleeve is disposed on the side wall of the stop plate away from the small box girder, and the connecting rod is rotatably connected between the connecting sleeve and the fixing sleeve.

[0015] Furthermore, the connecting sleeve is concave and includes a base plate and multiple vertical plates. The vertical plates are symmetrically arranged on both sides of the base plate, and a rotating shaft is connected between the vertical plates, with the rotating shaft passing through the connecting rod.

[0016] Furthermore, the fixing sleeve includes a plurality of support plates, which are symmetrically arranged and perpendicular to the abutment plate. The rotation shaft is connected between the support plates and passes through the connecting rod.

[0017] Furthermore, multiple positioning plates are spaced apart at the bottom of the fixing plate, and the prestressed steel strands are arranged through the positioning plates.

[0018] Furthermore, an anti-collision block is provided on the side wall of the limiting block near the edge of the fixing plate.

[0019] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0020] This utility model provides a transverse reinforcement connection device for prestressed concrete small box girders. The trapezoidal plate and connecting column of the central reinforcement mechanism provide top and internal side support for adjacent small box girders, respectively. This increases the connection strength of the wet joint between adjacent small box girders, helps the wet joint share the pressure, forms an effective stress dispersion system, avoids stress concentration, effectively delays structural fatigue and crack formation, makes the structure of adjacent small box girders more stable, and thus improves the service life of the small box girders. By continuously tensioning the prestressed steel strands, the abutment plate of the side reinforcement mechanism is continuously pressed against the outer wall of the small box girder, thereby supporting the outer wall of the small box girder through the connecting rod, making the structure of adjacent small box girders more stable and further improving the service life of the small box girders. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other embodiments can be obtained from these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the lateral structure of this utility model applied to a small box girder;

[0023] Figure 2 This is a schematic diagram of the forward structure of this utility model applied to a small box girder;

[0024] Figure 3 This is a schematic diagram of the structure of this utility model;

[0025] The diagram is labeled as follows:

[0026] 1-Small box girder, 2-Wet joint, 3-Fixing plate, 4-High-strength bolt, 5-Trapezoidal plate, 6-Fixing column, 7-Connecting column, 8-Screw rod, 9-Rotating disc, 10-Limiting hole, 11-Limiting block, 12-Connecting sleeve, 13-Tensioning end anchorage, 14-Fixing end anchorage, 15-Prestressed steel strand, 16-Positioning plate, 17-Connecting rod, 18-Rotating shaft, 19-Fixing sleeve, 20-Bottoming plate, 21-Anti-collision block. Detailed Implementation

[0027] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. The drawings illustrate preferred embodiments of this utility model. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this utility model.

[0028] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0029] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection or setting, a detachable connection or setting, or an integral connection or setting. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0030] Furthermore, in the description of this utility model, the terms "first," "second," etc., are used only for distinguishing descriptions and should not be construed as indicating or implying relative importance. Of course, such terms can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in a sequence other than those illustrated or described herein.

[0031] Example:

[0032] like Figure 1 and Figure 2 As shown, this embodiment provides a transverse reinforcement connection device for prestressed concrete small box girders, including a central reinforcement mechanism located in the middle of adjacent small box girders 1 and two symmetrical side reinforcement mechanisms located on both sides of adjacent small box girders 1.

[0033] Specifically, such as Figure 3 As shown, adjacent small box girders 1 are connected by wet joints 2. Each small box girder 1 has four first bolt holes at its bottom. A fixing plate 3 is fixed to the bottom of adjacent small box girders 1. The fixing plate 3 is a cuboid. A second bolt hole is opened in the middle of the fixing plate 3. Limiting holes 10 are opened on both sides of the fixing plate 3 near the edge. The limiting holes 10 have a rectangular cross-section. Four fasteners are fixed between the second bolt hole and the two limiting holes 10. In this embodiment, the fasteners are high-strength bolts 4. The high-strength bolts 4 are inserted into the first bolt holes respectively, thereby fixing the fixing plate 3 to the bottom of the small box girder 1.

[0034] The central reinforcement mechanism has one end abutting against the inner side wall and the bottom of the wet joint 2 between adjacent small box beams 1, and the other end penetrating through the middle of the fixed plate 3. The bottom of the central reinforcement mechanism is connected to a rotating disk 9. The central reinforcement mechanism includes a trapezoidal plate 5, a fixed column 6, two connecting columns 7 and a screw 8.

[0035] The trapezoidal plate 5 includes a horizontal plate and two side plates. The two side plates are symmetrically and inclinedly arranged on both sides below the horizontal plate. The bottom of the trapezoidal plate 5 is an open structure. The longitudinal section of the trapezoidal plate 5 is trapezoidal. The top horizontal plate of the trapezoidal plate 5 abuts against the bottom of the wet joint 2. The two side plates on both sides of the trapezoidal plate 5 abut against the inner side wall of the adjacent small box girder 1.

[0036] The fixing column 6 is a cuboid. The upper end of the fixing column 6 is welded and fixed to the lower end of the top horizontal plate of the trapezoidal plate 5. The lower end of the fixing column 6 is connected to the upper end of the screw rod 8. The bottom of the screw rod 8 passes through the second bolt hole and is located below the fixing plate 3. The bottom of the screw rod 8 is welded and connected to the rotating disk 9.

[0037] The connecting column 7 is a cuboid, symmetrically welded and fixed between the fixed column 6 and the two side plates of the trapezoidal plate 5. The connecting column 7 is gradually inclined upward from the side wall of the fixed column 6 to the inner walls of both sides of the trapezoidal plate 5, so as to facilitate the support of the small box girder 1.

[0038] Rotating the rotating disk 9 drives the screw 8 to rotate and rise, thereby giving the fixed column 6, connecting column 7 and trapezoidal plate 5 a rotating and upward force. Since the trapezoidal plate 5 abuts against the inner wall of the adjacent small box girder 1 and the bottom of the wet joint 2, the trapezoidal plate 5, fixed column 6 and connecting column 7 cannot rotate. As a result, the screw 8 rotates upward, driving the trapezoidal plate 5, fixed column 6 and connecting column 7 to rise, so that the trapezoidal plate 5 abuts against the inner wall of the adjacent small box girder 1 and the bottom of the wet joint 2, thereby making the abutment between the trapezoidal plate 5 and the small box girder 1 tighter.

[0039] When the wet joint 2 is compressed, it is supported at the top by the trapezoidal plate 5 and supported on the inner side by the connecting column 7. This increases the connection strength of the wet joint 2 between adjacent small box girders 1, helps the wet joint 2 to share the pressure, forms an effective stress dispersion system, avoids stress concentration, effectively delays structural fatigue and crack generation, makes the structure of adjacent small box girders 1 more stable, and thus improves the service life of the small box girders 1.

[0040] Specifically, the two side reinforcement mechanisms abut against the outer side walls of the adjacent small box girder 1 and slide through the fixed plate 3 near the edge on both sides. The bottom of the side reinforcement mechanisms are connected by prestressed steel strands 15.

[0041] The side reinforcement mechanism includes a limiting block 11, a connecting sleeve 12, a connecting rod 17, a fixing sleeve 19, and a stop plate 20. The limiting block 11 is a cuboid and is slidably disposed in the limiting hole 10. The upper end face of the limiting block 11 is flush with the upper end face of the limiting hole 10. The lower part of the limiting block 11 is provided with a through hole for installing the prestressed steel strand 15.

[0042] The connecting sleeve 12 is concave and includes a base plate and two vertical plates. The base plate is welded and fixed to the top of the limiting block 11 and is located on the upper end face of the limiting hole 10. The two vertical plates are perpendicular to the base plate and are symmetrically and integrally fixed to both sides of the base plate. A rotating shaft 18 is connected between the two vertical plates.

[0043] The abutment plate 20 is a cuboid and abuts against the outer wall of the small box girder 1. The fixing sleeve 19 is welded and fixed to the side wall of the abutment plate 20 away from the small box girder 1. The fixing sleeve 19 includes two support plates, which are symmetrically arranged and perpendicular to the abutment plate 20. A rotating shaft 18 is connected between the support plates.

[0044] The connecting rod 17 is rotatably connected between the connecting sleeve 12 and the fixed sleeve 19, and the rotating shaft 18 between the vertical plates and the rotating shaft 18 between the support plates respectively pass through both ends of the connecting rod 17.

[0045] Two positioning plates 16 are welded at equal intervals at the bottom of the fixing plate 3. The positioning plates 16 are cuboids and each positioning plate 16 has a positioning hole in the middle for positioning the prestressed steel strand 15. The two ends of the prestressed steel strand 15 pass through the through holes of the limiting block 11 respectively. The middle part of the prestressed steel strand 15 passes through the positioning hole and is inserted into the two positioning plates 16. One end of the prestressed steel strand 15 is connected to the limiting block 11 through the tensioning end anchor 13, and the other end is connected through the fixing end anchor 14.

[0046] The abutment plate 20 is attached to the outer wall of the small box girder 1. When the small box girder 1 is compressed, the prestressed steel strand 15 is tensioned at one end of the tensioning end anchor 13, so that the two limiting blocks 11 slide towards the small box girder 1 in the limiting hole 10. Then, the connecting rod 17 is rotated and pressed against the abutment plate 20 by the rotating shaft 18 in the connecting sleeve 12 and the fixing sleeve 19. When the prestressed steel strand 15 is continuously tensioned, the abutment plate 20 is continuously pressed against the outer wall of the small box girder 1. After tensioning is completed, the two side reinforcement mechanisms are fixed by the tensioning end anchor 13, so that the outer wall of the small box girder 1 is supported by the connecting rod 17, making the structure of the small box girder 1 more stable. The position of the limiting block 11 in the limiting hole 10 can be adjusted according to the slope of the side wall of the small box girder 1, so that the abutment plate 20 is attached to the outer wall of the small box girder 1, thereby improving the applicability of the device.

[0047] A collision protection block 21 is attached to the side wall of the limiting block 11 near the edge of the fixing plate 3 to prevent the limiting block 11 from hitting the edge of the limiting hole 10 and causing damage to the limiting block 11. In this embodiment, the collision protection block 21 is made of rubber.

[0048] The working principle of this embodiment is as follows:

[0049] When the small box girder 1 is compressed, the rotating disk 9 drives the screw 8 to rotate and rise, thereby making the trapezoidal plate 5 abut against the inner wall of the small box girder 1 and the bottom of the wet joint 2. When the top of the wet joint 2 is under force, the trapezoidal plate 5 and the connecting column 7 both play a supporting role, ensuring the strength of the connection between adjacent small box girders 1. The prestressed steel strand 15 at the bottom of the tensioning limit block 11 is tensioned, causing both side reinforcement mechanisms to move closer to the small box girder 1. When the prestressed steel strand 15 is continuously tensioned, the abutment plate 20 is continuously abutted against the outer wall of the small box girder 1, fixing the position of the connecting sleeve 12. The connecting rod 17 supports the outer wall of the small box girder 1. Based on the positioning plate 16, part of the force of the prestressed steel strand 15 is transmitted upward to the fixing plate 3. Thus, the connection strength of the wet joint 2 between adjacent small box girders 1 is increased through the trapezoidal plate 5 and the connecting column 7, improving the service life of the small box girder 1. When reinforcement is not required, the fixing plate 3 can be removed simply by removing the high-strength bolt 4 from the bottom of the small box girder 1.

[0050] The above-described specific examples are for illustrative purposes only and are not intended to limit the scope of this invention. Those skilled in the art to which this invention pertains can make various simple deductions, modifications, or substitutions based on the concept of this invention.

Claims

1. A transverse reinforcement connection device for a pre-stressed concrete small box girder, characterized in that: The device comprises a middle reinforcing mechanism and a plurality of symmetrically arranged side reinforcing mechanisms; The bottom of the adjacent small box girder (1) is provided with a fixed plate (3), one end of the middle reinforcing mechanism abuts against the inner side wall and the bottom of the wet joint (2) between the adjacent small box girders (1), and the other end penetrates the middle of the fixed plate (3), and the bottom of the middle reinforcing mechanism is connected with a rotating disc (9); A plurality of side reinforcing mechanisms respectively abut against the outer side walls of the adjacent small box girders (1) and respectively slide through the fixed plate (3) near the edge of both sides, and the bottoms of the side reinforcing mechanisms are connected by prestressed steel strands (15).

2. The transverse reinforcing and connecting device for the prestressed concrete small box girder according to claim 1, characterized in that: The middle of the fixed plate (3) is provided with a bolt hole, and the edges of the fixed plate (3) are respectively provided with limiting holes (10), and a plurality of fixing members are respectively arranged between the bolt hole and the limiting hole (10).

3. The transverse reinforcing and connecting device for the prestressed concrete small box girder according to claim 1, characterized in that: The middle reinforcing mechanism comprises a trapezoidal plate (5), a fixed column (6), a plurality of connecting columns (7) and a screw rod (8), the top of the trapezoidal plate (5) abuts against the bottom of the wet joint (2), the two sides of the trapezoidal plate (5) respectively abut against the inner side walls of the adjacent small box girders (1), one end of the fixed column (6) is arranged on the inner wall of the top of the trapezoidal plate (5), the other end is connected with the screw rod (8), the bottom of the screw rod (8) penetrates the bolt hole and is arranged below the fixed plate (3), the bottom of the screw rod (8) is connected with the rotating disc (9), and the connecting columns (7) are symmetrically connected between the fixed column (6) and the two sides of the trapezoidal plate (5).

4. The transverse reinforcing and connecting device for the prestressed concrete small box girder according to claim 3, characterized in that: The connecting columns (7) are gradually inclined upward from the side wall of the fixed column (6) to the inner wall of the two sides of the trapezoidal plate (5).

5. The transverse reinforcing and connecting device for the prestressed concrete small box girder according to claim 3, characterized in that: The trapezoidal plate (5) comprises a horizontal plate and a plurality of side plates, the side plates are respectively and symmetrically arranged below the two sides of the horizontal plate, and the longitudinal section of the trapezoidal plate (5) is trapezoidal.

6. The transverse reinforcing and connecting device for the prestressed concrete small box girder according to claim 1, characterized in that: The side reinforcing mechanism comprises a limiting block (11), a connecting sleeve (12), a connecting rod (17), a fixed sleeve (19) and an abutting plate (20), the limiting block (11) is slidably arranged in the limiting hole (10), the connecting sleeve (12) is arranged on the upper end surface of the limiting block (11), the abutting plate (20) abuts against the outer side wall of the small box girder (1), the fixed sleeve (19) is arranged on the side wall away from the small box girder (1) of the abutting plate (20), and the connecting rod (17) is rotatably connected between the connecting sleeve (12) and the fixed sleeve (19).

7. The transverse reinforcement connecting device for prestressed concrete small box girder according to claim 6, characterized in that: the connecting sleeve (12) is concave, comprising a bottom plate and a plurality of vertical plates, the vertical plates are symmetrically arranged on both sides of the bottom plate respectively, a rotating shaft (18) is connected between the vertical plates, and the rotating shaft (18) penetrates the connecting rod (17).

8. The transverse reinforcement connecting device for prestressed concrete small box girder according to claim 7, characterized in that: the fixing sleeve (19) comprises a plurality of support plates, the support plates are symmetrically arranged and perpendicular to the abutting plate (20), the rotating shaft (18) is connected between the support plates, and the rotating shaft (18) penetrates the connecting rod (17).

9. The transverse reinforcement connecting device for prestressed concrete small box girder according to claim 1, characterized in that: a plurality of positioning plates (16) are arranged at the bottom of the fixing plate (3) at intervals, and the prestressed steel strand (15) penetrates the positioning plate (16).

10. The transverse reinforcement connecting device for prestressed concrete small box girder according to claim 6, characterized in that: the limiting block (11) is provided with an anti-collision block (21) on the side wall close to the edge of the fixing plate (3).

Images