A prefabricated municipal road bridge

Abstract

This utility model relates to the field of road and bridge technology, and discloses a prefabricated municipal road bridge, including a beam base and multiple box girders. The box girders are laid on the beam base, and anti-collision walls are installed on both sides of the box girders. Trapezoidal holes with a trapezoidal longitudinal section are drilled through both ends of the box girders. Trapezoidal positioning columns with matching longitudinal sections are slidably inserted into the holes. The length of the positioning column is less than the length of the box girder, and one end can extend out and be inserted into the trapezoidal hole of an adjacent box girder. A rectangular opening communicating with the trapezoidal hole is opened on the upper surface of the box girder. A movable block fixed to the positioning column is provided inside the opening and can slide along the opening. The rectangular opening is covered by a detachable connecting component with a cover plate. There are two positioning grooves under the cover plate, and the movable block has a positioning block, allowing for selective slot limiting. This utility model solves the problems of difficult box girder alignment and poor stability. The trapezoidal structure prevents positioning column displacement, the positioning column connection across the box girder increases stability, the movable block simplifies operation, and the cover plate protects the components and the positioning grooves limit positioning, ensuring accuracy and stability.

Description

Technical Field

[0001] This utility model relates to the field of road and bridge technology, and in particular to a prefabricated municipal road and bridge. Background Technology

[0002] In recent years, the requirements for construction efficiency and project quality in municipal transportation construction have continued to increase. Prefabricated construction mode has become an important development direction in the road and bridge field due to its advantages such as prefabrication of components in factories, rapid on-site assembly, and minimal interference with the surrounding environment. Many large-scale bridge projects have begun to adopt the fully prefabricated assembly process, standardizing the production of core components such as piers, cap beams, and box girders in factories, and transporting them to the site for assembly after curing. The assembly accuracy requirements for prefabricated components have reached the millimeter level to ensure the overall stability and service life of the bridge structure.

[0003] However, existing prefabricated municipal road bridges still have obvious defects in the box girder assembly process: First, there are no rigid connecting components that can be bridging between the box girders, and the initial laying is achieved only by the support of the beam seats. There are no additional connecting supports between adjacent box girders, resulting in poor overall stability after assembly. Under the influence of factors such as vehicle load and temperature changes, relative displacement or loosening is likely to occur. Second, the lack of a precise guiding and positioning structure during the installation of box girders leads to the inability to accurately align adjacent box girders, which directly affects the overall flatness of the bridge deck and the subsequent assembly quality. Utility Model Content

[0004] To overcome the above shortcomings, this utility model provides a prefabricated municipal road bridge, which aims to improve the problem of poor overall stability after assembly caused by the lack of rigid connecting components between box girders.

[0005] To achieve the above objectives, this utility model adopts the following technical solution: a prefabricated municipal road bridge, including a beam base and multiple box girders, wherein the multiple box girders are laid on the beam base, and anti-collision walls are installed on both sides of the box girders; trapezoidal holes with a trapezoidal longitudinal section are opened through both ends of the box girders, and trapezoidal positioning columns with a longitudinal section adapted to the trapezoidal holes are slidably inserted into the trapezoidal holes, wherein the length of the positioning column is less than the length of the box girder, so that one end of the positioning column can extend out of the trapezoidal hole and be inserted into the trapezoidal hole of the adjacent box girder; a rectangular opening is opened on the upper surface of the box girder, which corresponds to and is connected to each trapezoidal hole, and a movable block is provided in the rectangular opening and fixedly connected to the upper surface of the positioning column; the movable block can slide along the length direction of the rectangular opening to drive the positioning column to move within the trapezoidal hole;

[0006] Each rectangular opening is covered by a cover plate via a detachable connecting assembly. The lower surface of the cover plate has two positioning grooves spaced apart along the length of the rectangular opening. The upper surface of the movable block is fixedly installed with a positioning block. When the positioning column is completely located in the trapezoidal hole, the positioning block is inserted into the positioning groove near the inner side of the box girder. When one end of the positioning column extends out of the trapezoidal hole and is inserted into the trapezoidal hole of the adjacent box girder, the positioning block is inserted into the positioning groove near the outer side of the box girder.

[0007] Preferably, the connecting assembly includes multiple wedge grooves formed on the inner walls of opposite sides of the rectangular opening, and multiple wedge blocks respectively fixedly installed on the inner walls of opposite sides of the movable block; the multiple wedge blocks correspond one-to-one with the multiple wedge grooves, and the wedge blocks are detachably inserted into the wedge grooves to achieve detachable connection and positioning between the cover plate and the rectangular opening.

[0008] Preferably, the top surface of the box girder is symmetrically provided with stepped grooves along the length direction, and the bottom of each of the two stepped grooves is provided with multiple spaced-apart locking holes; a T-shaped precast slab is provided between each pair of adjacent box girders, and the two ends of the precast slab are respectively placed in the stepped grooves of the two adjacent box girders; the bottom of the crash barrier is placed in the stepped grooves of the two side box girders, and the precast slab and the crash barrier are both fixedly installed in the stepped grooves by multiple locking posts that are adapted to the locking holes.

[0009] Preferably, the insert has an axially spaced storage cavity filled with resin; the insert has multiple axially spaced dispensing holes on its side, all of which are connected to the storage cavity; a push plate is slidably installed in the storage cavity, the resin is located above the push plate, and the insert has a transmission assembly for driving the push plate to move axially along the storage cavity.

[0010] Preferably, the side of the locking post is provided with an axially extending strip hole, which is connected to the storage cavity and located below the push plate; the transmission assembly includes a friction block slidably assembled in the strip hole and a connecting rod fixedly installed on the lower surface of the push plate, the end of the connecting rod away from the push plate passing through the strip hole and fixedly connected to the friction block, and the outer wall of the friction block protruding from the outer wall of the locking post.

[0011] Preferably, a sealing gasket is fixedly installed on the upper surface of the push plate. The sealing gasket is an elastic rubber gasket, and the outer peripheral wall of the sealing gasket is tightly fitted with the inner wall of the storage cavity.

[0012] Preferably, the movable block is a rectangular block structure adapted to the rectangular opening, and the outer wall of the movable block slides in conjunction with the inner wall of the rectangular opening.

[0013] Preferably, the inner wall of the trapezoidal hole is covered with a wear-resistant coating, which is a ceramic coating or a metal alloy coating, and the wear-resistant coating is combined with the inner wall of the trapezoidal hole by a thermal spraying process to reduce the wear between the positioning post and the inner wall of the trapezoidal hole when the positioning post slides.

[0014] Preferably, the interior of the crash barrier is provided with reinforcing ribs spaced apart along its height and length directions to enhance its stability.

[0015] Preferably, each of the dispensing holes is equipped with a removable dust plug made of rubber, which seals the dispensing hole when the retaining post is not installed, preventing dust or impurities from entering the storage cavity and contaminating the resin adhesive.

[0016] This utility model has the following beneficial effects:

[0017] 1. In this utility model, the device firstly sets trapezoidal holes with a trapezoidal longitudinal section at both ends of the box girder, and cooperates with trapezoidal positioning columns with a matching longitudinal section. The guiding characteristics of the trapezoidal structure can prevent the positioning columns from shifting during the sliding process, ensuring that the positioning columns can be accurately aligned with the trapezoidal holes of adjacent box girders. This completely solves the problem of difficulty in accurately aligning box girders when installing the same row of box girders, greatly reduces assembly errors, and improves the overall flatness of the bridge deck and construction quality.

[0018] One end of the positioning column can extend out of the current box girder and be inserted into the trapezoidal hole of the adjacent box girder to form a "cross-box girder connection". Compared with the traditional method of relying solely on the beam seat for support, it adds an extra rigid connection point between the box girders, significantly improving the assembly stability of adjacent box girders and reducing the displacement or loosening of the box girders due to uneven stress during bridge use.

[0019] The rectangular opening on the upper surface of the box girder engages with the moving block, allowing operators to directly move the positioning column by pushing the moving block without the need for complex tools. This simplifies the operation of extending and retracting the positioning column and improves assembly efficiency. The cover plate, through a detachable connecting component, covers the rectangular opening, protecting the internal moving block and positioning column from external rainwater and impurities, extending the service life of the components. Furthermore, the two positioning grooves on the lower surface of the cover plate, in conjunction with the positioning blocks on the moving block, enable precise positioning of the positioning column in both "retracted" and "extended alignment" states. When the positioning column is fully retracted, the positioning block inserts into the inner positioning groove to prevent accidental slippage during transportation or early assembly. When the positioning column is extended and aligned, the positioning block inserts into the outer positioning groove to fix the position of the positioning column, preventing displacement of the positioning column during bridge use and thus avoiding misalignment of the box girder. This further ensures assembly accuracy and long-term structural stability.

[0020] 2. In this utility model, regarding the connecting components, the wedge groove on the inner wall of the rectangular opening cooperates with the wedge block on the edge of the cover plate. The one-to-one insertion structure of the wedge block and the wedge groove can achieve a tight connection between the cover plate and the rectangular opening, preventing the cover plate from loosening under bridge vibration or external force. At the same time, the detachable design facilitates the later inspection and maintenance of the internal moving blocks and positioning columns without damaging the box girder body.

[0021] In the transverse connection of the box girder and the fixing of the crash barrier, the stepped groove on the top surface of the box girder provides precise positioning support for the precast slab and the crash barrier, avoiding misalignment during installation; the T-shaped precast slab spans the adjacent box girder and is fixed with the clamping posts that match the clamping holes, which not only enhances the transverse integrity of the adjacent box girders and reduces gap deformation when the bridge deck is under stress, but also fills the gap between the box girders through the covering effect of the precast slab, improving the flatness of the bridge deck; the crash barrier and the box girder share the stepped groove and clamping post fixing structure, which not only ensures the accuracy of the crash barrier installation, but also simplifies the construction process and reduces the assembly complexity of different components.

[0022] In terms of sealing and bonding reinforcement, the storage cavity inside the locking column is filled with resin adhesive. With the help of the push plate and transmission components, when the locking column is inserted into the locking hole, the friction between the friction block and the inner wall of the locking hole can drive the push plate to automatically squeeze the resin adhesive, so that the resin adhesive is squeezed out from the glue outlet and fills the gap between the precast slab, the anti-collision wall and the stepped groove. This eliminates the need for manual additional glue application, which not only improves construction efficiency, but also achieves the dual effect of "mechanical fixing + bonding reinforcement" through the curing of the resin adhesive. This greatly enhances the connection sealing performance, prevents rainwater from seeping into the gaps and corroding the components, and improves the crack resistance of the overall structure. The elastic rubber sealing gasket on the push plate can prevent the resin adhesive from leaking from the gap between the push plate and the inner wall of the storage cavity, ensuring that the resin adhesive can be fully squeezed out and act on the gap filling.

[0023] In terms of component durability and operational smoothness, the moving block is designed as a rectangular block structure that fits the rectangular opening. The sliding fit between its outer wall and the inner wall of the rectangular opening ensures that the moving block moves the positioning post smoothly without jamming, further improving the accuracy of the alignment operation. The ceramic coating or metal alloy wear-resistant coating on the inner wall of the trapezoidal hole can effectively reduce the friction loss between the positioning post and the hole wall when the positioning post slides repeatedly, extending the service life of the positioning post and the trapezoidal hole and reducing the later maintenance cost. The reinforcing ribs set at intervals along the height and length of the crash barrier can enhance the overall structural strength and impact resistance of the crash barrier, better resisting the external forces such as vehicle scratches and impacts, and improving the safety of bridge use. The rubber dust plug in the glue outlet can seal the glue outlet when the clamping post is not installed, preventing dust and impurities from entering the storage cavity and contaminating the resin glue, ensuring that the resin glue always maintains good bonding performance, avoiding the decrease in sealing and bonding effect due to resin glue contamination, reducing the cleaning process before construction, and further simplifying the operation process. Attached Figure Description

[0024] Figure 1This is a three-dimensional structural diagram of a prefabricated municipal road bridge proposed in this utility model;

[0025] Figure 2 This is a three-dimensional structural diagram of one end of a box girder in a prefabricated municipal road bridge proposed in this utility model.

[0026] Figure 3 This is a schematic diagram of a three-dimensional partial cross-sectional structure of the connection end of two box girders in a prefabricated municipal road bridge proposed in this utility model.

[0027] Figure 4 This is a bottom-view three-dimensional structural diagram of a prefabricated municipal road bridge cover plate proposed in this utility model.

[0028] Figure 5 This is a three-dimensional structural diagram of precast slabs and crash barriers in a prefabricated municipal road bridge proposed in this utility model.

[0029] Figure 6 This is a schematic diagram of the overall structure of a prefabricated municipal road bridge pillar proposed in this utility model;

[0030] Figure 7 This is a schematic diagram of the three-dimensional cross-sectional structure of a prefabricated municipal road bridge column proposed in this utility model.

[0031] Legend:

[0032] 1. Beam seat, 2. Box beam, 3. Anti-collision wall, 4. Trapezoidal hole, 5. Positioning column, 6. Moving block, 7. Cover plate, 8. Positioning block, 9. Wedge block, 10. Locking hole, 11. Precast slab, 12. Locking column, 13. Storage cavity, 14. Glue outlet hole, 15. Push plate, 16. Friction block, 17. Connecting rod, 18. Positioning groove. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0034] Example 1, refer to Figures 1-7A prefabricated municipal road bridge includes a beam seat 1 and multiple box girders 2. The box girders 2 are laid on the beam seat 1, and anti-collision walls 3 are installed on both sides of the box girders 2. Trapezoidal holes 4 with trapezoidal cross-sections are opened through both ends of the box girders 2. Trapezoidal positioning columns 5 with longitudinal sections adapted to the trapezoidal holes 4 are slidably inserted into the trapezoidal holes 4. The length of the positioning column 5 is less than the length of the box girders 2, so that one end of the positioning column 5 can extend out of the trapezoidal hole 4 and be inserted into the trapezoidal hole 4 of the adjacent box girders 2. The upper surface of the box girders 2 has rectangular openings that correspond one-to-one with and are connected to each trapezoidal hole 4. The rectangular openings are provided with objects fixed to the upper surface of the positioning columns 5. The movable block 6 is connected and can slide along the length of the rectangular opening to move the positioning column 5 within the trapezoidal hole 4. Each rectangular opening is covered by a cover plate 7 via a detachable connecting component. The lower surface of the cover plate 7 has two positioning grooves 18 spaced apart along the length of the rectangular opening. The upper surface of the movable block 6 is fixedly installed with a positioning block 8. When the positioning column 5 is completely located within the trapezoidal hole 4, the positioning block 8 is inserted into the positioning groove 18 near the inner side of the box girder 2. When one end of the positioning column 5 extends out of the trapezoidal hole 4 and is inserted into the trapezoidal hole 4 of the adjacent box girder 2, the positioning block 8 is inserted into the positioning groove 18 near the outer side of the box girder 2.

[0035] The trapezoidal positioning column 5 is adapted to guide the trapezoidal hole 4. After the moving block 6 drives the positioning column 5 to extend and insert into the trapezoidal hole 4 of the adjacent box girder 2, the positioning block 8 inserts into the corresponding positioning groove 18 of the cover plate 7 for limitation. Due to the trapezoidal structure preventing displacement and the double positioning groove locking state, the adjacent box girder 2 is accurately aligned and stable for a long time.

[0036] Example 2, refer to Figures 1-7Based on Embodiment 1, the connecting assembly includes multiple wedge grooves formed on the inner walls of opposite sides of the rectangular opening, and multiple wedge blocks 9 respectively fixedly installed on the opposite side walls of the movable block 6; the multiple wedge blocks 9 correspond one-to-one with the multiple wedge grooves, and the wedge blocks 9 are detachably inserted into the wedge grooves to achieve detachable connection and positioning between the cover plate 7 and the rectangular opening. The wedge blocks 9 fit tightly with the wedge grooves and are detachable, achieving a stable connection between the cover plate 7 and the rectangular opening to prevent loosening, while also facilitating later maintenance; the top surface of the box girder 2 is symmetrically provided with stepped grooves along the length direction, with two steps... The bottom of each groove is provided with multiple spaced-apart locking holes 10; a T-shaped precast slab 11 is provided between each pair of adjacent box girders 2, with both ends of the precast slab 11 resting in the stepped grooves of the two adjacent box girders 2 respectively. The bottom of the crash barrier 3 rests in the stepped grooves of the box girders 2 on both sides, and both the precast slab 11 and the crash barrier 3 are fixedly installed in the stepped grooves by multiple locking posts 12 that are adapted to the locking holes 10. The positioning of the stepped grooves and the locking posts 12 and locking holes 10 are matched to achieve the lateral connection of adjacent box girders 2 and the stable installation of the crash barrier 3; the interior of the locking posts 12 is along the axis A storage cavity 13 is provided, which is filled with resin. Multiple adhesive outlet holes 14 are spaced apart along the axial direction on the side of the retaining post 12, and all the outlet holes 14 are connected to the storage cavity 13. A push plate 15 is slidably installed in the storage cavity 13, with the resin located above the push plate 15. The retaining post 12 is equipped with a transmission component for driving the push plate 15 to move axially along the storage cavity 13. The push plate 15 slides in a sealed manner, and the adhesive outlet holes 14 are connected to the storage cavity 13, thus achieving sealing and reinforcement of the gap between the precast slab 11, the anti-collision wall 3, and the stepped groove. The side of the locking post 12 has an axially extending strip hole that is connected to the storage cavity 13 and located below the push plate 15. The transmission assembly includes a friction block 16 that is slidably assembled in the strip hole and a connecting rod 17 that is fixedly installed on the lower surface of the push plate 15. The end of the connecting rod 17 away from the push plate 15 passes through the strip hole and is fixedly connected to the friction block 16. The outer wall of the friction block 16 protrudes from the outer wall of the locking post 12. The friction between the friction block 16 and the inner wall of the locking hole 10 is sufficient to enable the push plate 15 to automatically squeeze the resin without manual operation.

[0037] Example 3, refer to Figures 1-7Based on Embodiment 1 or Embodiment 2, a sealing gasket is fixedly installed on the upper surface of the push plate 15. The sealing gasket is an elastic rubber gasket, and the outer peripheral wall of the sealing gasket is tightly fitted with the inner wall of the storage cavity 13. The sealing gasket elastically compensates for gaps and fits tightly with the inner wall of the storage cavity 13 to prevent resin leakage and ensure that the adhesive is fully squeezed out. The moving block 6 is a rectangular block structure adapted to the rectangular opening. The outer wall of the moving block 6 slides with the inner wall of the rectangular opening. The rectangular structure restricts the lateral displacement of the moving block 6, so that the positioning column 5 moves accurately and without jamming in the trapezoidal hole 4, ensuring the alignment accuracy of the box girder 2. The inner wall of the trapezoidal hole 4 is covered with a wear-resistant coating, which is a ceramic coating or a metal alloy coating. The wear-resistant coating is bonded to the inner wall of the trapezoidal hole 4 by a thermal spraying process. The coating is designed to reduce wear between the positioning post 5 and the inner wall of the trapezoidal hole 4 when the positioning post 5 slides. The coating has strong wear resistance and is firmly bonded to the inner wall of the trapezoidal hole 4, reducing the sliding wear of the positioning post 5 and extending the service life of both. The interior of the anti-collision wall 3 is provided with reinforcing ribs at intervals along its height and length directions to enhance its stability. The reinforcing ribs disperse the impact and deformation stress borne by the anti-collision wall 3, improve its overall structural strength, and enhance its stability against external impact. Each glue outlet 14 is equipped with a removable dust plug made of rubber. When the clamping post 12 is not installed, the glue outlet 14 is sealed to prevent dust or impurities from entering the storage cavity 13 and contaminating the resin glue. The dust plug is sealed and dustproof and removable to prevent dust and impurities from entering the storage cavity 13 and contaminating the resin glue, ensuring reliable adhesive bonding performance.

[0038] Working principle: First, multiple box girders 2 are laid on the beam seat 1. Anti-collision walls 3 are installed on both sides of the box girders 2. Reinforcing ribs are spaced along the height and length of the anti-collision walls 3 to enhance stability, completing the bridge foundation load-bearing structure. To achieve precise alignment of adjacent box girders 2 in the same row, trapezoidal holes 4 with a trapezoidal longitudinal section are drilled through both ends of the box girders 2. The inner wall of the trapezoidal holes 4 is covered with a ceramic or metal alloy wear-resistant coating using a thermal spraying process to reduce subsequent sliding wear of components. Trapezoidal positioning columns 5 with matching longitudinal sections are slidably inserted into the trapezoidal holes 4. The length of the positioning column 5 is less than the length of the box girder 2, ensuring that one end can extend from the trapezoidal hole 4 of the current box girder 2 and insert into the trapezoidal hole 4 of the adjacent box girder 2, providing a guiding reference for the alignment of the two box girders 2. The upper surface of the box girder 2 has rectangular openings that correspond one-to-one with and are connected to each trapezoidal hole 4. Inside the openings are movable blocks 6 that are fixed to the upper surface of the positioning column 5. The movable blocks 6 are rectangular blocks that fit the rectangular openings. The outer wall of the movable block 6 slides with the inner wall of the rectangular opening. Pushing the movable block 6 along the length of the rectangular opening can move the positioning column 5 within the trapezoidal hole 4, thus enabling the positioning column 5 to extend and retract. Each rectangular opening is covered by a detachable connecting component, which includes wedge grooves on the inner walls of the rectangular openings on opposite sides and wedge blocks 9 on the inner walls of the cover plate 7 on opposite sides. Multiple wedge blocks 9 correspond one-to-one with multiple wedge grooves. Inserting wedge blocks 9 enables the detachable connection and positioning of the cover plate 7 and the rectangular opening, preventing the cover plate 7 from loosening. At the same time, two positioning grooves 18 are spaced apart along the length of the rectangular opening on the lower surface of the cover plate 7. Positioning blocks 8 are installed on the upper surface of the moving block 6. When the positioning post 5 is fully retracted into the trapezoidal hole 4 of the current box girder 2, the positioning block 8 is inserted into the positioning groove 18 near the inner side of the box girder 2, forming a retraction limit for the positioning post 5. When one end of the positioning post 5 extends out and is inserted into the trapezoidal hole 4 of the adjacent box girder 2, the positioning block 8 is inserted into the positioning groove 18 near the outer side of the box girder 2, forming an extension alignment limit for the positioning post 5, ensuring that there is no relative displacement after the adjacent box girder 2 is aligned, and guaranteeing assembly accuracy and structural stability.

[0039] The top surface of the box girder 2 has symmetrical stepped grooves along its length. Multiple spaced locking holes 10 are located at the bottom of each stepped groove. These grooves provide positioning support for the installation of the precast slab 11 and the crash barrier 3. A T-shaped precast slab 11 is installed between each pair of adjacent box girders 2. Both ends of the precast slab 11 rest within the stepped grooves of the adjacent two box girders 2. The bottom of the crash barrier 3 rests within the stepped grooves of the box girders 2 on both sides. Multiple locking posts 12, which are compatible with the locking holes 10, are used to fix the precast slab 11 and the crash barrier 3 within the stepped grooves, achieving lateral connection between adjacent box girders 2 and stable assembly of the crash barrier 3 and the box girder 2. To enhance the sealing and connection stability of the precast slab 11, the anti-collision wall 3, and the stepped groove, a storage cavity 13 is opened axially inside the retaining post 12, which is filled with resin. Multiple glue outlet holes 14 are opened on the side of the retaining post 12 at intervals along the axial direction. All glue outlet holes 14 are connected to the storage cavity 13, and there is a removable rubber dust plug in the glue outlet hole 14. When the retaining post 12 is not installed, the glue outlet holes 14 are blocked to prevent dust and impurities from contaminating the resin. A sliding push plate 15 is sealed inside the storage cavity 13. The resin is located above the push plate 15. An elastic rubber sealing gasket is installed on the upper surface of the push plate 15. The outer peripheral wall of the sealing gasket is tightly fitted with the inner wall of the storage cavity 13 to prevent the resin from leaking out from the gap. The locking post 12 is equipped with a transmission assembly that drives the push plate 15 to move axially along the storage cavity 13. This assembly includes a strip-shaped hole extending axially along the side of the locking post 12, which connects to the storage cavity 13 and is located below the push plate 15. A friction block 16 is slidably mounted inside the hole. A connecting rod 17 is mounted on the lower surface of the push plate 15. The end of the connecting rod 17 away from the push plate 15 passes through the strip-shaped hole and is fixed to the friction block 16. The outer wall of the friction block 16 protrudes from the outer wall of the locking post 12. When the locking post 12 is inserted into the locking hole 10, the friction block 16 protruding from the locking post 12 contacts the inner wall of the locking hole 10, generating friction. This causes the friction block 16 to slide upward along the strip-shaped hole. The connecting rod 17 drives the push plate 15 to move upward within the storage cavity 13, squeezing out resin adhesive from the adhesive outlet 14. This resin adhesive fills the gap between the precast slab 11, the anti-collision wall 3, and the stepped groove. After the resin adhesive cures, it enhances the sealing performance and improves the connection stability between the precast slab 11, the anti-collision wall 3, and the box girder 2 through bonding.

[0040] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A prefabricated municipal road bridge comprising a beam seat (1) and a plurality of box girders (2), characterized in that: Multiple box girders (2) are laid on the beam seat (1), and anti-collision walls (3) are installed on both sides of the box girders (2); trapezoidal holes (4) with trapezoidal longitudinal sections are opened through both ends of the box girders (2), and trapezoidal positioning columns (5) with longitudinal sections adapted to the trapezoidal holes (4) are slidably inserted in the trapezoidal holes (4). The length of the positioning column (5) is less than the length of the box girders (2), so that one end of the positioning column (5) can extend out of the trapezoidal hole (4) and be inserted into the trapezoidal hole (4) of the adjacent box girders (2); a rectangular opening is opened on the upper surface of the box girders (2) and is connected to each trapezoidal hole (4). A moving block (6) is fixedly connected to the upper surface of the positioning column (5) in the rectangular opening. The moving block (6) can slide along the length direction of the rectangular opening to drive the positioning column (5) to move in the trapezoidal hole (4); Each rectangular opening is covered by a cover plate (7) via a detachable connecting component. The lower surface of the cover plate (7) has two positioning grooves (18) spaced apart along the length of the rectangular opening. The upper surface of the movable block (6) is fixedly installed with a positioning block (8). When the positioning column (5) is completely located in the trapezoidal hole (4), the positioning block (8) is inserted into the positioning groove (18) near the inner side of the box girder (2). When one end of the positioning column (5) extends out of the trapezoidal hole (4) and is inserted into the trapezoidal hole (4) of the adjacent box girder (2), the positioning block (8) is inserted into the positioning groove (18) near the outer side of the box girder (2).

2. The prefabricated municipal road bridge as claimed in claim 1, wherein: The connecting assembly includes multiple wedge grooves opened on the inner walls of opposite sides of the rectangular opening, and multiple wedge blocks (9) respectively fixedly installed on the opposite side walls of the movable block (6); the multiple wedge blocks (9) correspond one-to-one with the multiple wedge grooves, and the wedge blocks (9) can be detachably inserted into the wedge grooves to realize the detachable connection and positioning of the cover plate (7) and the rectangular opening.

3. The prefabricated municipal road bridge as claimed in claim 1, wherein: The top surface of the box girder (2) is symmetrically provided with stepped grooves along the length direction, and the bottom of each of the two stepped grooves is provided with multiple spaced-apart locking holes (10); a T-shaped precast slab (11) is provided between each two adjacent box girders (2), and the two ends of the precast slab (11) are respectively erected in the stepped grooves of the two adjacent box girders (2). The bottom of the crash barrier (3) is erected in the stepped grooves of the two side box girders (2), and the precast slab (11) and the crash barrier (3) are both fixedly installed in the stepped grooves by multiple locking posts (12) that are adapted to the locking holes (10).

4. The prefabricated municipal road bridge as claimed in claim 3, wherein: The internal cavity of the locking post (12) is provided with a storage cavity (13) along the axial direction, and the storage cavity (13) is filled with resin glue; the side of the locking post (12) is provided with a plurality of glue outlet holes (14) distributed along the axial direction, and the plurality of glue outlet holes (14) are connected to the storage cavity (13); a push plate (15) is slidably installed in the storage cavity (13), the resin glue is located above the push plate (15), and the locking post (12) is provided with a transmission component for driving the push plate (15) to move along the axial direction of the storage cavity (13).

5. The prefabricated municipal road bridge as claimed in claim 4, wherein: The side of the locking post (12) is provided with an axially extending strip hole, which is connected to the storage cavity (13) and located below the push plate (15); the transmission assembly includes a friction block (16) slidably assembled in the strip hole, and a connecting rod (17) fixedly installed on the lower surface of the push plate (15). The end of the connecting rod (17) away from the push plate (15) passes through the strip hole and is fixedly connected to the friction block (16), and the outer wall of the friction block (16) protrudes from the outer wall of the locking post (12).

6. The prefabricated municipal road bridge as claimed in claim 5, wherein: A sealing gasket is fixedly installed on the upper surface of the push plate (15). The sealing gasket is an elastic rubber gasket, and the outer peripheral wall of the sealing gasket is tightly fitted with the inner wall of the storage cavity (13).

7. The prefabricated municipal road bridge as claimed in claim 1, wherein: The movable block (6) is a rectangular block structure adapted to the rectangular opening, and the outer wall of the movable block (6) slides with the inner wall of the rectangular opening.

8. The prefabricated municipal road bridge as claimed in claim 1, wherein: The inner wall of the trapezoidal hole (4) is covered with a wear-resistant coating, which is a ceramic coating or a metal alloy coating. The wear-resistant coating is combined with the inner wall of the trapezoidal hole (4) by a thermal spraying process to reduce the wear between the positioning post (5) and the inner wall of the trapezoidal hole (4) when the positioning post (5) slides.

9. The prefabricated municipal road bridge as claimed in claim 1, wherein: The anti-collision wall (3) is provided with reinforcing ribs at intervals along its height and length to enhance its stability.

10. The prefabricated municipal road bridge as claimed in claim 4, wherein: Each of the glue outlet holes (14) is equipped with a removable dust plug. The dust plug is made of rubber and seals the glue outlet hole (14) when the locking post (12) is not installed, preventing dust or impurities from entering the storage cavity (13) and contaminating the resin glue.

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