Hollow precast slab for a river gate and traffic bridge

Abstract

This utility model relates to the field of bridge construction technology in water conservancy engineering, and discloses a hollow precast slab for a river sluice gate traffic bridge. It includes an upper slab with a support mechanism fixedly connected internally. Multiple ribs are fixedly connected to the bottom of the upper slab, and an assembly mechanism is fixedly connected to the bottom of each rib. The assembly mechanism includes a lower slab, the top of which is fixedly connected to the bottom of the ribs. Multiple protrusions are fixedly connected to one side of the lower slab, and multiple grooves are formed on the other side. Two sealing strips are fixedly connected to the opposite sides of two ribs. In this utility model, the protrusions and grooves are precisely engaged through a mortise and tenon joint, and then concrete is filled at the joint. The adhesive force of the concrete, combined with the mechanical interlocking force of the mortise and tenon structure, tightly bonds the slab into a whole, improving the shear strength of the joint.

Description

Technical Field

[0001] This utility model relates to the field of water conservancy engineering bridge construction technology, and in particular to a hollow precast slab for a river gate and pumping station traffic bridge. Background Technology

[0002] In water conservancy projects, traffic bridges are often constructed using cast-in-place concrete structures or solid precast slab structures. While cast-in-place concrete structures offer a certain degree of integrity, their construction cycle is lengthy and susceptible to adverse weather conditions such as rain, snow, and high temperatures. Furthermore, they require a large investment in formwork and support systems, resulting in high labor and material costs. In particular, in scenarios with complex terrain and tight deadlines, the need for efficient construction is difficult to meet. Although solid precast slabs can reduce on-site work time, their heavy weight and large volume necessitate reliance on heavy equipment for transportation. The hoisting process places stringent requirements on the bridge foundation's bearing capacity. As the span increases, the economy and engineering applicability decrease significantly, making it difficult to balance cost and performance. Therefore, a hollow precast slab for river gate and pumping station traffic bridges has emerged.

[0003] By using a hollow section design, concrete material is concentrated at the upper and lower edges of the section. When subjected to loads such as vehicles, the concrete at the top of the section mainly resists the compressive force, while the bottom steel bars bear the tensile force. The hollow area in the middle reduces redundant material. By utilizing the principle of mechanical moment of inertia, the self-weight is significantly reduced while ensuring bending stiffness. The arrangement of steel bars and the strength of concrete are efficiently controlled, so that the components have stable load-bearing performance from the factory. During on-site installation, multiple slabs are connected into a whole through connection structures such as hinge joints and embedded parts. The load is transferred to the supports and piers through the slabs, forming an efficient force-bearing system.

[0004] Currently, hollow precast slabs for river gate and pumping station bridges have promoted the construction of water conservancy and transportation bridges due to their lightweight and industrialization advantages. However, they have structural shortcomings. The hollow cross-section results in insufficient shear area of ​​the web. Under the action of external forces such as vehicle loads and settlement, the web may develop diagonal cracks due to excessive principal tensile stress. When the inter-slab connection structure has insufficient reinforcement anchorage or bonding, the lateral load transfer efficiency is low, which exacerbates the shear burden on individual slabs. Long-term vibration will also weaken the bond performance between the reinforcement and concrete, reducing shear capacity. These defects make hollow precast slabs susceptible to shear failure under high loads, strong vibrations, or complex geological conditions, affecting the long-term structural safety and restricting their application in higher-standard projects. Therefore, a hollow precast slab for river gate and pumping station bridges is proposed to solve the above problems. Utility Model Content

[0005] To overcome the above deficiencies, this utility model provides a hollow precast slab for a river gate traffic bridge, which aims to improve the problem of insufficient shear area of ​​the web caused by the hollow cross section in the prior art.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A hollow precast slab for a river gate traffic bridge includes an upper slab, a support mechanism fixedly connected inside the upper slab, multiple ribs fixedly connected to the bottom of the upper slab, and an assembly mechanism fixedly connected to the bottom of the multiple ribs.

[0008] The assembly mechanism includes a lower plate, the top of which is fixedly connected to the bottom of a plurality of ribs, a plurality of protrusions fixedly connected to one side of the lower plate, and a plurality of grooves opened on the other side of the lower plate. Two sealing strips are fixedly connected to the far sides of two ribs, and reinforcing components are fixedly connected to the near sides of a plurality of ribs.

[0009] The above technical solution involves fixing multiple ribs to the top of the lower plate to form a basic frame. One side has multiple protrusions, and the other side has corresponding grooves. The mortise and tenon structure enables quick positioning and splicing of adjacent units, improving installation accuracy. Two sealing strips made of rubber are fixed to the outer surface of each rib on both sides. After splicing, the gaps can be sealed to prevent rainwater from entering and causing structural corrosion. Reinforcing components are installed on the inner sides of multiple ribs to enhance the shear and tensile strength between the plates, ensuring that the whole structure can work together to bear the load after splicing, thus improving structural stability and load-bearing capacity.

[0010] As a further description of the above technical solution:

[0011] The reinforcing component includes three partitions. The two sides of each partition are fixedly connected to the adjacent sides of the two ribs. The partitions have multiple through holes. A buffer layer is fixedly connected to the adjacent sides of the partitions and the two ribs. A heat insulation layer is fixedly connected to the adjacent sides of the two buffer layers. A reinforcing layer is fixedly connected to the adjacent sides of the other two partitions.

[0012] The above technical solution enhances the connection performance of the reinforced component through a multi-layer structure. Its core consists of three partitions arranged in parallel. The partitions are fixedly connected to the inner sides of adjacent ribs on both sides to form a rigid support frame. Multiple regular through holes are opened inside the partitions to reduce their weight and facilitate pipeline insertion. At the same time, the channel structure disperses stress concentration. A buffer layer is set at the junction of the partition and the rib. A heat insulation layer is embedded between the two buffer layers. A reinforcing layer is added on the opposite side of the adjacent partitions.

[0013] As a further description of the above technical solution:

[0014] The support mechanism includes a steel bar splice, the outer wall of which is fixedly connected to the inside of the upper plate, and a composite layer is fixedly connected to the top of the upper plate, with a spring pad fixedly connected to the top of the composite layer.

[0015] Through the above technical solution: the support structure uses steel splices as the core load-bearing component, and its outer wall is fixedly connected to the interior of the upper plate to form an integral load-bearing skeleton. A composite layer is set on the top of the upper plate, which is made of concrete and forms a rigid connection with the upper plate to enhance the bending stiffness of the section. A spring pad is added to the top of the composite layer to buffer the impact of vehicle loads, absorb vibration energy, reduce structural damage caused by rigid contact, and adapt to minor deformations, thereby improving the comfort and durability of the bridge deck.

[0016] As a further description of the above technical solution:

[0017] The shape of the protrusion matches the shape of the groove, and the cross-sectional shape of the rib is I-shaped;

[0018] Through the above technical solution, the protrusions and grooves are precisely matched to form a mortise and tenon joint structure, ensuring rapid positioning and installation of adjacent components. The rib beams adopt an I-shaped cross-section to optimize material distribution and significantly improve bending stiffness and structural stability.

[0019] As a further description of the above technical solution:

[0020] The shape of the steel reinforcement splice is mesh-like, and the material of the composite layer is metal.

[0021] The above technical solution involves a mesh-like structure of steel reinforcement splices, which serves as a load-bearing skeleton. The composite layer is made of metal to enhance overall rigidity and improve the load-bearing capacity and stability of the support structure.

[0022] As a further description of the above technical solution:

[0023] The two sides of the heat insulation layer are respectively fixedly connected to the side of the two rib beams that are close to each other; the two sides of the reinforcing layer are respectively fixedly connected to the side of the two rib beams that are close to each other.

[0024] The above technical solution involves fixing the insulation layer to the inner side of the adjacent rib beams on both sides to effectively block heat transfer. The reinforcing layer is also connected to the two rib beams, and high-strength materials are used to enhance the shear and tensile resistance of the splice, thereby improving the overall stability of the structure.

[0025] As a further description of the above technical solution:

[0026] The multiple ribs are connected end to end, and the multiple protrusions and multiple grooves correspond one-to-one;

[0027] The above technical solution involves connecting multiple ribs end to end to form a stable frame, with multiple protrusions and grooves corresponding one-to-one, and using mortise and tenon joints to achieve rapid and precise installation of precast panels, thereby enhancing the overall connection strength.

[0028] As a further description of the above technical solution:

[0029] The sealing strip has a rectangular cross-sectional shape, and the three partitions are spaced at the same distance.

[0030] The above technical solution involves a rectangular cross-section design for the sealing strip, which fits tightly into the gaps during splicing. The three partitions are evenly spaced, ensuring a neat layout of internal components and improving structural stability.

[0031] This utility model has the following beneficial effects:

[0032] 1. In this utility model, the mortise and tenon structure of the protrusion and groove is precisely engaged, and then concrete is filled at the joint. The adhesive force of the concrete and the mechanical interlocking force of the mortise and tenon structure are used to tightly bond the panels into a whole, thereby improving the shear strength of the spliced ​​parts. The sealing strip on the outside of the rib beam is crucial in this process. It is made of elastic material. When the precast panels are engaged, it is squeezed to fill the gaps and form a sealing layer, which prevents rainwater from entering and avoids structural corrosion. At the same time, it absorbs the load vibration energy through elastic deformation, reducing stress concentration. Through the synergistic effect of the structure and materials, adjacent precast panels are tightly bonded, the overall structure is enhanced, the shear resistance is significantly improved, and it can effectively resist long-term loads and environmental impacts, extend the service life of precast panel bridges, and provide a guarantee for the durability of water conservancy and transportation bridges.

[0033] 2. In this utility model, the rib beams serve as the core components, tightly connecting the upper and lower plates. Multiple rib beams provide support for the installation of the partition. The overlapping layer at the top of the upper plate enhances the crack resistance of the precast slab, while the elastic pads above it can buffer the impact of vehicle loads and absorb vibration energy, improving comfort and durability. The buffer layers on both sides of the partition alleviate rigid impacts and reduce the risk of cracking. The heat insulation layer blocks heat transfer, adapts to temperature differences, and avoids structural damage from thermal expansion and contraction. The reinforcing layer uses high-strength materials to improve the bending and shear resistance at the joints, while the mesh steel reinforcement enhances the overall load-bearing capacity. The synergistic effect of all components optimizes the mechanical properties and durability of the precast slab, providing a reliable solution for the construction of water conservancy and transportation bridges. Attached Figure Description

[0034] Figure 1 This is a three-dimensional schematic diagram of a hollow precast slab for a river gate traffic bridge proposed in this utility model;

[0035] Figure 2 This is a schematic diagram of the structure of the partition of a hollow precast slab for a river gate traffic bridge proposed in this utility model;

[0036] Figure 3 This is a schematic diagram of the steel reinforcement structure of a hollow precast slab for a river gate traffic bridge proposed in this utility model;

[0037] Figure 4 This is a schematic diagram of the groove structure of a hollow precast slab for a river gate traffic bridge proposed in this utility model.

[0038] Legend:

[0039] 1. Upper plate; 2. Assembly mechanism; 21. Lower plate; 22. Protrusion; 23. Groove; 24. Sealing strip; 3. Rib beam; 4. Reinforcing component; 41. Partition plate; 42. Through hole; 43. Buffer layer; 44. Heat insulation layer; 45. Reinforcing layer; 5. Support mechanism; 51. Overlapping layer; 52. Spring pad; 53. Steel reinforcement splice. Detailed Implementation

[0040] The following is in conjunction with the appendix Figure 1 - Appendix Figure 4 This application will be described in further detail below.

[0041] Reference Figures 1 to 3 This utility model provides an embodiment of a hollow precast slab for a river sluice gate traffic bridge, comprising an upper slab 1, with a support mechanism 5 fixedly connected inside the upper slab 1, serving as the core load-bearing structure. Multiple ribs 3 are fixedly connected to the bottom of the upper slab 1, and an assembly mechanism 2 is fixedly connected to the bottom of the multiple ribs 3. The assembly mechanism 2 includes a lower slab 21, the top of which is fixedly connected to the bottom of the multiple ribs 3, providing basic support. Multiple protrusions 22 are fixedly connected to one side of the lower slab 21, and multiple grooves 23 are provided on the other side. Two sealing strips 24 are fixedly connected to the opposite sides of two ribs 3, effectively filling the gaps between the two precast slabs during splicing. Each side of the precast slab is fixedly connected to a reinforcing component 4, which includes three partitions 41. The two sides of the partitions 41 are fixedly connected to the sides of the two rib beams 3. The partitions 41 have multiple through holes 42 inside. The design of the through holes 42 reduces the weight of the precast slab and facilitates the insertion of pipelines, achieving a unity of function and structure. The partitions 41 and the sides of the two rib beams 3 are fixedly connected to a buffer layer 43. The buffer layer 43 is arranged in an upper and lower layout, which effectively protects the components located between the two buffer layers 43. The sides of the two buffer layers 43 are fixedly connected to a heat insulation layer 44, and the sides of the other two partitions 41 are fixedly connected to a reinforcing layer 45, which greatly improves the practicality and safety of the entire precast slab.

[0042] Specifically, a hollow precast slab for a river gate traffic bridge includes an upper slab 1 and connected supporting mechanisms 5, rib beams 3, and assembly mechanisms 2. The supporting mechanism 5 is the core load-bearing structure, enhancing the overall load-bearing capacity. The rib beams 3 are I-shaped, connecting the upper slab 1 to the lower slab 21 of the assembly mechanism, providing support for the installation of partitions 41. The lower slab 21 achieves precast slab splicing through a tenon-and-mortise structure of protrusions 22 and grooves 23. Sealing strips 24 fill gaps, improving sealing and shear resistance. In the reinforcing components 4, partitions 41 have through holes 42 to reduce weight and facilitate pipeline insertion. Buffer layers 43 are arranged vertically to protect intermediate components and absorb vibration. Insulation layers 44 block heat and adapt to temperature differences. Reinforcing layers 45 enhance the strength of the splicing joints. The synergistic effect of these structures significantly improves the practicality and safety of the precast slab.

[0043] Reference Figures 2 to 4The support structure 5 includes a steel reinforcement splice 53, the outer wall of which is fixedly connected to the interior of the upper slab 1. Its mesh structure significantly improves the load-bearing capacity of the entire precast slab. A composite layer 51 is fixedly connected to the top of the upper slab 1, and a spring pad 52 is fixedly connected to the top of the composite layer 51. The spring pad 52 can buffer the impact of vehicle loads and absorb vibration energy when the precast slab comes into contact with a vehicle, reducing structural damage caused by rigid contact. The shape of the protrusion 22 matches the shape of the groove 23. When building the bridge, the protrusions of two adjacent precast slabs are aligned. Block 22 and groove 23 correspond one-to-one and interlock, with the filling concrete making the interlocking even stronger. This mortise and tenon design not only facilitates installation but also effectively improves the shear resistance of the precast slab joints. The cross-sectional shape of the rib beam 3 is I-shaped, which optimizes material distribution and enhances the bending stiffness of the precast slab. The shape of the steel reinforcement splice 53 is mesh-like, which can evenly distribute the load and effectively improve the load-bearing capacity of the entire precast slab. The composite layer 51 is made of metal, which greatly improves the crack resistance of the entire precast slab and effectively resists... To prevent cracks from forming and spreading under external forces, the insulation layer 44 is fixedly connected to the adjacent sides of the two ribs 3 on both sides. The insulation layer 44 is made of sandwich composite material, which can effectively block heat transfer and is suitable for environments with large temperature differences or insulation requirements, avoiding damage to the structure caused by thermal expansion and contraction. The reinforcing layer 45 is fixedly connected to the adjacent sides of the two ribs 3 on both sides. The reinforcing layer 45 is made of fiber-reinforced metal material, which can further improve the overall bending and shear resistance of the component, ensuring that the hollow precast slabs form a continuous structure after splicing. The system relies on a load-bearing structure that balances structural strength and functional adaptability. The buffer layer 43 is made of an elastic material that can absorb vibration energy, alleviate rigid impact under load, reduce the risk of cracks at the joints, and improve the durability of the precast slab. Multiple rib beams 3 are connected end to end, and multiple protrusions 22 and multiple grooves 23 correspond one-to-one, making adjacent precast slabs more secure when spliced. The sealing strip 24 has a rectangular cross-section, making two adjacent precast slabs fit more tightly. The three partitions 41 are spaced at the same distance, making the entire precast slab more stable.

[0044] Specifically, this type of hollow precast slab for river gate and traffic bridge enhances performance through multi-structure collaboration. In the support structure, the mesh steel reinforcement splices evenly distribute the load, enhancing the load-bearing capacity; the composite layer improves crack resistance; the elastic pads buffer vehicle impacts; the mortise and tenon joint design with concrete filling strengthens the shear resistance at the joints; the rectangular sealing strip tightly fits the gaps; the I-beam ribs optimize material distribution, improving bending stiffness; and the ribs are connected end to end, with corresponding protrusions and concavities ensuring a firm splice. In the reinforcement components, equally spaced partitions, along with an elastic buffer layer, a sandwich insulation layer, and a fiber-reinforced metal reinforcement layer, respectively reduce the risk of cracking, block heat, and improve overall strength, jointly ensuring the durability and structural stability of the precast slab.

[0045] Working principle: When building the bridge, the protrusions 22 and grooves 23 of two adjacent precast slabs are aligned and engaged one by one. The concrete filling makes the engagement more secure. Due to the presence of the sealing strip 24 on one side of the rib beam 3, the gaps generated when the two precast slabs are spliced ​​can be filled, thereby making the two adjacent precast slabs fit more tightly, thus achieving a significant improvement in shear resistance and greatly extending the service life of the entire precast slab. The presence of the rib beam 3 makes the upper slab 1 and the lower slab 21 closely connected. At the same time, multiple rib beams 3 contact each other in pairs, providing a place for the installation of the partition 41.

[0046] The presence of the composite layer 51 on the top of the upper slab 1 significantly improves the crack resistance of the entire precast slab. The presence of the elastic pad 52 allows the precast slab to buffer the impact of vehicle loads when in contact with vehicles, absorb vibration energy, reduce structural damage caused by rigid contact, and adapt to minor deformations, thus improving the comfort and durability of the bridge deck. The presence of the buffer layer 43 allows the entire precast slab to absorb vibration energy, alleviate the rigid impact under load, and reduce the risk of cracks at the joints. The presence of the heat insulation layer 44 allows the entire precast slab to effectively block heat transfer when in contact with heat, making it suitable for environments with large temperature differences or insulation requirements, and avoiding damage to the structure caused by thermal expansion and contraction. The presence of the reinforcing layer 45 further enhances the overall bending and shear resistance of the entire precast slab, ensuring that the hollow precast slabs form a continuous and reliable load-bearing system after splicing, taking into account both structural strength and functional adaptability. The mesh shape of the steel reinforcement splice 53 significantly improves the load-bearing capacity of the entire precast slab.

[0047] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A hollow precast slab for a river sluice gate traffic bridge, comprising an upper slab (1), characterized in that: The upper plate (1) is internally fixedly connected to a support mechanism (5), and the bottom of the upper plate (1) is fixedly connected to multiple ribs (3), and the bottom of the multiple ribs (3) is fixedly connected to an assembly mechanism (2). The assembly mechanism (2) includes a lower plate (21), the top of which is fixedly connected to the bottom of a plurality of ribs (3), a plurality of protrusions (22) are fixedly connected to one side of the lower plate (21), and a plurality of grooves (23) are provided on the other side of the lower plate (21). Two sealing strips (24) are fixedly connected to the far side of two ribs (3), and reinforcing components (4) are fixedly connected to the near side of a plurality of ribs (3).

2. The hollow precast slab for a river sluice gate traffic bridge according to claim 1, characterized in that: The reinforcing component (4) includes three partitions (41). The two sides of the partitions (41) are fixedly connected to the adjacent sides of the two ribs (3). The partitions (41) have multiple through holes (42). The partitions (41) and the adjacent sides of the two ribs (3) are fixedly connected to a buffer layer (43). The adjacent sides of the two buffer layers (43) are fixedly connected to a heat insulation layer (44). The adjacent sides of the other two partitions (41) are fixedly connected to a reinforcing layer (45).

3. The hollow precast slab for a river sluice gate traffic bridge according to claim 1, characterized in that: The support mechanism (5) includes a steel bar splice (53), the outer wall of which is fixedly connected to the inside of the upper plate (1), and a composite layer (51) is fixedly connected to the top of the upper plate (1), and a spring pad (52) is fixedly connected to the top of the composite layer (51).

4. A hollow precast slab for a river sluice gate traffic bridge according to claim 1, characterized in that: The shape of the protrusion (22) matches the shape of the groove (23), and the cross-sectional shape of the rib (3) is I-shaped.

5. A hollow precast slab for a river sluice gate traffic bridge according to claim 3, characterized in that: The steel reinforcement splice (53) is mesh-like in shape, and the composite layer (51) is made of metal.

6. A hollow precast slab for a river sluice gate traffic bridge according to claim 2, characterized in that: The heat insulation layer (44) is fixedly connected to the two adjacent sides of the two ribs (3) on both sides, and the reinforcing layer (45) is fixedly connected to the two adjacent sides of the two ribs (3) on both sides.

7. A hollow precast slab for a river sluice gate traffic bridge according to claim 2, characterized in that: The multiple ribs (3) are connected end to end, and the multiple protrusions (22) and multiple grooves (23) correspond one to one.

8. A hollow precast slab for a river sluice gate traffic bridge according to claim 2, characterized in that: The sealing strip (24) has a rectangular cross-sectional shape, and the three partitions (41) are spaced at the same distance.

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