A new type of double-layer closed-section corrugated steel plate bridge and culvert structure

Abstract

The utility model belongs to bridge and culvert engineering technical field, concretely relates to a novel double -deck closed section corrugated steel sheet bridge and culvert structure. Include: horizontal base, the horizontal base lays in the bottom layer, compaction fills the soil layer, the compaction fills the soil layer and sits on horizontal base upper side, bridge and culvert subassembly, bridge and culvert subassembly sets up in compaction fills the soil layer, and bridge and culvert subassembly includes: double -deck closed section corrugated steel sheet spare, double -deck closed section corrugated steel sheet spare is same with the shape of bridge and culvert, H type steel connecting piece, H type steel connecting piece sets up in double -deck closed section corrugated steel sheet spare, is used for supporting connection, reinforcing mesh, reinforcing mesh lays in double -deck closed section corrugated steel sheet spare, grouting, grouting pours in double -deck closed section corrugated steel sheet spare inside. The utility model improves the load synergic ability of structure and filling layer obviously, makes the whole bearing capacity, foundation uneven settlement adaptability and durability synchronous enhancement.

Description

Technical Field

[0001] This utility model belongs to the field of bridge and culvert engineering technology, specifically relating to a novel double-layer closed-section corrugated steel plate bridge and culvert structure. Background Technology

[0002] Corrugated steel plates, as a high-performance structural material, are widely used in bridge and culvert reinforcement due to their excellent load-bearing capacity, stability, orthogonality, and ease of processing. They are particularly suitable for older bridges or culverts that require enhanced structural strength and extended service life. Corrugated steel plates can be customized to meet specific needs, adapting to the structural characteristics and geometries of various bridges and culverts, including curved and complex geometries.

[0003] As a type of embedded flexible structure, soil-covered corrugated steel plate bridges and culverts significantly enhance their load-bearing capacity through the synergistic force-sharing mechanism between the corrugated steel plates and the surrounding soil. Compared to traditional bridge and culvert structures, this design offers higher load-bearing capacity, excellent deformation adaptability, and outstanding economic advantages. Currently, most soil-covered corrugated steel plate bridges and culverts in China adopt open cross-section designs, while closed cross-section structures demonstrate unique value in specific working conditions such as low-fill soil: they offer high design flexibility, allowing for adjustments to the cross-sectional shape based on terrain; they also have lower requirements for foundation bearing capacity and possess excellent hydraulic characteristics.

[0004] Although closed-section corrugated steel plate bridges and culverts exhibit better resistance to uneven settlement than open-section bridges and can adapt better to adverse geological conditions, uneven foundation settlement in extreme geological environments such as coal mine goaf areas can still induce typical defects such as bridge deck pavement collapse, end wall cracking, and joint failure, seriously threatening structural safety and durability. To improve the load-bearing capacity and settlement resistance of corrugated steel plate bridges and culverts, utility model patent CN201922417945.4, published on July 24, 2020, discloses a soil-covered corrugated steel plate bridge based on a crushed stone grouting filling layer. This method involves laying a crushed stone pavement layer on the outside of the arch ring and grouting pipes within the crushed stone pavement layer for grouting. This effectively solves the problem of difficult compaction of the backfill soil on the outside of the corrugated steel plate and effectively improves the load-bearing capacity of the corrugated steel plate bridge. However, this reinforcement structure has limitations, specifically: while paving a layer of crushed stone on the outside of the arch increases the structural bearing capacity, the cross-section of the reinforcement structure is an open section, which usually requires a large foundation bearing capacity, resulting in weak deformation adaptability. The invention patent CN202110512419.5, published on July 9, 2021, discloses a double-layer corrugated steel reinforcement structure for damaged bridges and culverts. Due to the presence of corrugated steel plates, this reinforcement structure significantly improves the structure's impermeability and resistance to uneven foundation settlement, making it less prone to cracking and leakage. However, this reinforcement structure has limitations: the use of double-layer corrugated steel plates doubles the amount of steel used, reducing its economic efficiency. The invention patent CN201511030659.2, published on June 8, 2016, discloses an arch bridge structure using foamed concrete and corrugated steel plates. The foamed concrete filling material above and on both sides of the arch ring can effectively improve the structural bearing capacity. However, this structure has limitations, specifically: the economic advantages of the soil-covered corrugated steel plate bridge are significantly weakened, and it no longer has obvious advantages in terms of construction convenience. Summary of the Invention

[0005] This invention provides a novel double-layer closed-section corrugated steel plate bridge structure to improve the load-bearing capacity and settlement resistance of corrugated steel plate bridges and culverts.

[0006] This utility model adopts the following technical solution: a novel double-layer closed-section corrugated steel plate bridge and culvert structure, comprising: A horizontal foundation, which is laid at the bottom layer; A compacted fill layer is situated on the upper side of a horizontal foundation; Bridge and culvert assembly, wherein the bridge and culvert assembly is disposed in a compacted fill layer, the bridge and culvert assembly comprising: A double-layer closed-section corrugated steel plate component, wherein the double-layer closed-section corrugated steel plate component has the same shape as the bridge culvert; H-beam connectors are installed inside double-layer closed-section corrugated steel plates for supporting connections. Reinforcing mesh, wherein the reinforcing mesh is laid inside a double-layer closed-section corrugated steel plate; The grout is cast inside a double-layered closed-section corrugated steel plate.

[0007] In some embodiments, the double-layer closed-section corrugated steel plate is formed by the outer corrugated steel plate and the inner corrugated steel plate being coaxially offset to form a closed section, which can be circular, tubular arch, elliptical, or pear-shaped.

[0008] In some embodiments, the H-beam connector is formed by cross-welding longitudinal H-beams and transverse H-beams into a grid, and is disposed between the outer corrugated steel plate and the inner corrugated steel plate.

[0009] In some embodiments, the upper flange of the longitudinal H-beam or the transverse H-beam is connected to the trough of the outer corrugated steel plate by bolts, and the lower flange of the longitudinal H-beam or the transverse H-beam is connected to the crest of the inner corrugated steel plate by bolts.

[0010] In some embodiments, the web of the H-beam connector has a through hole, which can be circular, elliptical, or hexagonal in shape.

[0011] In some embodiments, the spacing of the longitudinal H-beams is 1 / 9 to 1 / 6 of the total arc length of the inner corrugated steel sheet, and the spacing of the transverse H-beams is 1 / 20 to 1 / 10 of the longitudinal length of the inner corrugated steel sheet.

[0012] In some embodiments, the reinforcing mesh is formed by longitudinal and transverse reinforcing bars passing perpendicularly through the through-holes in the web of the H-beam and tied together.

[0013] In some embodiments, the grout is concrete, which is poured between the outer corrugated steel plate and the inner corrugated steel plate, and wraps the H-beams and steel mesh. The thickness of the interlayer is 1 / 30 to 1 / 20 of the bridge span.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The presence of double-layer closed-section corrugated steel plates significantly enhances the impermeability and resistance to uneven foundation settlement of the new corrugated steel plate bridge and culvert structure, effectively reducing the risk of structural cracking and leakage. The coaxial staggered arrangement of the double-layer closed-section corrugated steel plates increases the overall thickness and moment of inertia of the structure, improves bending stiffness, and facilitates stress dispersion, reducing stress concentration.

[0015] The double-layer closed-section corrugated steel plate components are connected by high-strength bolts between the sections, which facilitates the formation of various cross-sectional shapes, provides high flexibility, and makes installation and disassembly convenient and quick, effectively improving construction efficiency.

[0016] The bidirectional perforated H-beam connectors significantly improve overall stiffness and load-bearing capacity, forming the main load-bearing skeleton with the double-layer closed-section corrugated steel plates, enhancing overall spatial stability. The longitudinal H-beams bear longitudinal tensile forces and transmit longitudinal shear forces, greatly improving longitudinal stiffness and load-bearing capacity. The transverse H-beams resist radial deformation and restrain local buckling of the corrugated steel plates, enhancing circumferential stiffness and restraint. The perforated design of the bidirectional H-beams facilitates concrete pouring.

[0017] Because the filling material is ultra-high performance concrete, the load-bearing capacity and stability of the new corrugated steel plate bridge and culvert structure are significantly improved. The dense structure and excellent durability of ultra-high performance concrete provide good protection for the internal steel structure, enhancing the durability and sealing of the corrugated steel structure.

[0018] The reinforcing mesh can control shrinkage cracks and temperature cracks in ultra-high performance concrete, provide three-dimensional constraints, enhance the ductility of ultra-high performance concrete, and the reinforcing mesh passing through the web holes of the H-section steel enhances the bonding performance of the steel-ultra-high performance concrete interface and enhances the shear force transfer between the corrugated steel and the ultra-high performance concrete. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural view of the present invention; Figure 2 This is a three-dimensional structural view of the longitudinal H-beam connector of this utility model; Figure 3 This is a three-dimensional structural view of the transverse H-beam connector of this utility model; Figure 4 This is a partial detailed cross-sectional view of the longitudinal structure of the H-beam connector of this utility model; Figure 5 for Figure 4 Side view; Figure 6 This is a schematic diagram of the steel mesh structure of this utility model; Figure 7 This is a schematic diagram of the overlapping structure of the corrugated steel plate components of this utility model; Figure 8 This is an elevation view of the double-layer closed-section corrugated steel plate bridge and culvert structure of this utility model; In the diagram: 1-Double-layer closed-section corrugated steel plate; 1-1-Outer corrugated steel plate; 1-2-Inner corrugated steel plate; 2-H-beam connector; 2-1-Longitudinal H-beam; 2-2-Transverse H-beam; 2-3-Bolt; 2-4-Through hole in the web of H-beam; 3-Reinforcing mesh; 3-1-Longitudinal reinforcement; 3-2-Transverse reinforcement; 4-Grouting material; 5-Backfill layer; 6-Horizontal foundation; 7-High-strength bolt. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0021] like Figure 8 As shown, a novel double-layer closed-section corrugated steel plate bridge and culvert structure includes: Horizontal foundation 6, which is laid at the bottom layer; Compacted fill layer 5, which is located on the upper side of horizontal foundation 6; Bridge and culvert components, wherein the bridge and culvert components are disposed in the compacted fill layer 5, and the bridge and culvert components include: Double-layer closed-section corrugated steel plate component 1, wherein the double-layer closed-section corrugated steel plate component 1 has the same shape as the bridge culvert; H-beam connector 2, which is installed inside the double-layer closed-section corrugated steel plate 1, is used for support and connection; Reinforcing mesh 3, which is laid inside the double-layer closed-section corrugated steel plate 1; The grout 4 is poured into the interior of the double-layer closed-section corrugated steel plate 1.

[0022] The structure significantly enhances the load-bearing capacity of the structure and the fill layer through the synergistic stiffening mechanism of double-layer closed-section corrugated steel plate 1, bidirectional open H-beam connector 2, steel mesh 3 and grout 4, thereby simultaneously enhancing the overall bearing capacity, adaptability to uneven settlement of the foundation and durability.

[0023] The double-layer closed-section corrugated steel plate component 1 is formed by coaxially offset outer corrugated steel plate component 1-1 and inner corrugated steel plate component 1-2, creating a closed-section shape. This section can be circular, tubular arch, elliptical, or pear-shaped. In this embodiment, the cross-sectional shape of the double-layer closed-section corrugated steel plate component 1 is tubular arch.

[0024] like Figure 2 , Figure 3 , Figure 4 , Figure 5As shown: Longitudinal H-beams 2-1 and transverse H-beams 2-2 are intersected and welded into a grid, positioned between two layers of corrugated steel plates. The upper flange of the H-beams is connected to the trough of the outer corrugated steel plate 1-1 via bolts 2-3, and the lower flange of the H-beams is connected to the crest of the inner corrugated steel plate 1-2 via bolts 2-3. The longitudinal H-beams bear longitudinal tensile force and transmit longitudinal shear force, significantly improving longitudinal stiffness and load-bearing capacity. The transverse H-beams resist radial deformation and restrain local buckling of the corrugated steel plates, enhancing circumferential stiffness and restraint. The web of the bidirectional perforated H-beam connector 2 has through holes 2-3, the shape of which can be circular, elliptical, or hexagonal, facilitating concrete pouring.

[0025] The spacing of the longitudinal H-beams 2-1 is 1 / 9 to 1 / 6 of the total arc length of the inner corrugated steel plate 102, and the spacing of the transverse H-beams 2-2 is 1 / 20 to 1 / 10 of the longitudinal length of the inner corrugated steel plate 1-2. like Figure 5 As shown: The reinforcing mesh 3 is formed by longitudinal reinforcing bars 3-1 and transverse reinforcing bars 3-2 passing perpendicularly through the through holes 2-4 of the web of the H-shaped steel and being tied together; the reinforcing mesh can control ultra-high performance shrinkage cracks and temperature cracks, enhance the bonding performance of the steel-ultra-high performance concrete interface, and enhance the shear force transfer between corrugated steel and ultra-high performance concrete.

[0026] The grouting material 4 is ultra-high performance concrete, which is poured between the double-layer closed-section corrugated steel plates 1, and wraps the H-beams 2 and steel mesh 3. The thickness of the interlayer is 1 / 30 to 1 / 20 of the bridge and culvert span.

[0027] like Figure 7 As shown: The segments of the double-layer closed-section corrugated steel plate 1 are connected by high-strength bolts 7, which facilitates the formation of various cross-sectional shapes, provides high flexibility, and makes installation and disassembly convenient and quick, effectively improving construction efficiency.

[0028] like Figure 8 As shown: A compacted backfill layer 5 is set above the outer corrugated steel plate 1-1. The backfill material is sandy soil and gravelly soil. Below it is a horizontal foundation, which is a sand and gravel foundation 6.

[0029] In actual construction, the new double-layer closed-section corrugated steel plate bridge and culvert structure is implemented according to the following steps: I. Excavation and Treatment of Foundation Pit. Excavate trenches according to design requirements. When encountering unfavorable soil layers such as silt, foundation reinforcement is required. Avoid over-excavation and disturbance of the foundation. The dimensions, elevation, and bearing capacity of the formed foundation pit should be checked in a timely manner. After passing the inspection, the horizontal foundation should be constructed immediately. 2. Lay a gravel or crushed stone foundation 6, and add a coarse gravel pad layer in the contact area with the outer corrugated steel plate 1-1 to ensure a smooth interface. 3. Corrugated steel plate assembly. After verifying the flatness and elevation of the foundation, a movable wooden workbench is erected at the bottom of the pipe; the inner and outer corrugated steel plate components are assembled in layers, using a coaxial staggered arrangement; the sections are connected by high-strength bolts 7, and the joints are pre-applied with weather-resistant sealant or embedded with polyethylene foam board for sealing; IV. H-beam mesh installation. Prefabricated bi-directional perforated H-beams 2 are welded between the double-layer corrugated steel plates; the upper flange is anchored to the trough of the outer steel plate 1-1 using bolts 2-3, and the lower flange is fixed to the crest of the inner steel plate 1-2 using bolts 2-3. V. Reinforcing Mesh Tying. The longitudinal reinforcing bars 3-1 and transverse reinforcing bars 3-2 are perpendicularly passed through the through-holes 2-4 in the web of the H-section steel and tied together to form a spatial mesh. The ends of the reinforcing bars are bent at 12°~15°, with hooks 80~120mm long to enhance the UHPC bond strength; VI. Concrete pouring for the interlayer. Formwork is erected at the ends of the corrugated steel plate, and ultra-high performance concrete 4 is poured into the interlayer to completely enclose the H-beams 2 and the reinforcing mesh 3. After demolding, it is cured according to specifications. 7. Symmetrical backfilling and compaction. Sandy or gravelly soil is backfilled in layers on both sides of the structure, with each layer compacted using a road roller to a density ≥96%. 8. Real-time Deformation Monitoring. From the start of backfilling to the completion of the arch filling, the dimensions of the corrugated steel section are measured immediately after each layer is compacted. If the deformation exceeds the limit, work is immediately stopped to trace the source and take corrective measures. IX. Completion and Acceptance. After the structural morphology monitoring and all tests pass, the construction is confirmed to be complete.

[0030] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A novel double-layer closed-section corrugated steel plate bridge and culvert structure, characterized in that, include: A horizontal foundation (6) is laid at the bottom layer; A compacted fill layer (5) is situated on the upper side of a horizontal foundation (6); Bridge and culvert assembly, wherein the bridge and culvert assembly is disposed in the compacted fill layer (5), the bridge and culvert assembly comprising: Double-layer closed-section corrugated steel plate component (1), wherein the double-layer closed-section corrugated steel plate component (1) has the same shape as the bridge culvert; H-beam connector (2), the H-beam connector (2) is set inside the double-layer closed-section corrugated steel plate (1) for supporting connection; Reinforcing mesh (3), the reinforcing mesh (3) is laid inside the double-layer closed-section corrugated steel plate (1); The grout (4) is poured into the interior of the double-layer closed-section corrugated steel plate (1).

2. The novel double-layer closed-section corrugated steel plate bridge and culvert structure according to claim 1, characterized in that, The double-layer closed-section corrugated steel plate (1) is formed by the outer corrugated steel plate (1-1) and the inner corrugated steel plate (1-2) being coaxially offset to form a closed section, which is circular, tubular arch, or elliptical pear-shaped.

3. The novel double-layer closed-section corrugated steel plate bridge and culvert structure according to claim 2, characterized in that, The H-beam connector (2) is formed by cross-welding longitudinal H-beams (2-1) and transverse H-beams (2-2) into a grid, and is located between the outer corrugated steel plate (1-1) and the inner corrugated steel plate (1-2).

4. The novel double-layer closed-section corrugated steel plate bridge and culvert structure according to claim 3, characterized in that, The upper flange of the longitudinal H-beam (2-1) or the transverse H-beam (2-2) is connected to the trough of the outer corrugated steel plate (1-1) by bolts (2-3), and the lower flange of the longitudinal H-beam (2-1) or the transverse H-beam (2-2) is connected to the crest of the inner corrugated steel plate (1-2) by bolts (2-3).

5. The novel double-layer closed-section corrugated steel plate bridge and culvert structure according to claim 1, characterized in that, The web of the H-beam connector (2) has through holes, which are circular, elliptical or hexagonal in shape.

6. The novel double-layer closed-section corrugated steel plate bridge and culvert structure according to claim 3 or 4, characterized in that, The spacing of the longitudinal H-beams (2-1) is 1 / 9 to 1 / 6 of the total arc length of the inner corrugated steel plate (1-2), and the spacing of the transverse H-beams (2-2) is 1 / 20 to 1 / 10 of the longitudinal length of the inner corrugated steel plate (1-2).

7. The novel double-layer closed-section corrugated steel plate bridge and culvert structure according to claim 1, characterized in that, The steel mesh (3) is formed by longitudinal steel bars (3-1) and transverse steel bars (3-2) passing vertically through the through holes (2-4) of the web of the H-shaped steel and being tied together.

8. The novel double-layer closed-section corrugated steel plate bridge and culvert structure according to claim 2, characterized in that, The grout (4) is concrete, which is poured between the outer corrugated steel plate (1-1) and the inner corrugated steel plate (1-2), and wraps the H-shaped steel connector (2) and the steel mesh (3). The thickness of the interlayer is 1 / 30 to 1 / 20 of the bridge span.

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