Underpass pipe anti-blocking drainage structure

Abstract

This utility model relates to a culvert pipe anti-clogging drainage structure, belonging to the field of drainage equipment; it includes a reinforced concrete culvert pipe, a drainage steel culvert pipe, a drainage outlet, a steel plate, an expansion joint, and a steel fiber reinforced concrete layer. The expansion joint includes an expansion joint channel steel fixed to the top of the steel plate. An embedded groove is provided on the upper inner wall of the expansion joint channel steel, and an elastic debris-blocking plate is fixed within the embedded groove. The inner end of the elastic debris-blocking plate has an upward arc bend. Below the reinforced concrete culvert pipe are a concrete base plate, a graded sand and gravel replacement layer, and a bidirectional polyester geogrid. This utility model can block debris within the groove area above and outside the elastic debris-blocking plate, thus better preventing clogging. The graded sand and gravel replacement layer improves the overall rigidity of the foundation, reduces uneven settlement, and disperses stress. Through the binding effect of the bidirectional polyester geogrid, the load at the bottom of the culvert is diffused to the surrounding soil, enhancing the shear resistance of the foundation soil and suppressing local settlement.

Description

Technical Field

[0001] This utility model relates to a culvert pipe anti-clogging drainage structure, belonging to the field of drainage equipment. Background Technology

[0002] Current expansion joint-type road drainage structures intercept road surface water flow through expansion joints and discharge it to roadside ditches via culverts, effectively solving the problem of road surface water accumulation. However, in actual use, it has been found that road debris such as gravel, fallen leaves, and silt can easily enter the culvert through the expansion joints, causing blockage of drainage openings or culverts, reducing drainage efficiency. Furthermore, the soil structure at the bottom of the culvert is unstable and prone to foundation settlement, which can lead to culvert deformation, misalignment, and blockage of drainage openings. Utility Model Content

[0003] This utility model provides a culvert pipe anti-clogging drainage structure to solve the problems existing in the background art.

[0004] This utility model relates to a culvert pipe anti-clogging and drainage structure, including a reinforced concrete culvert pipe poured into a foundation trench in the roadbed, base layer and surface layer. A drainage steel culvert pipe is provided in the inner hole of the reinforced concrete culvert pipe. A drainage outlet is provided at the top of the drainage steel culvert pipe. A steel plate is fixed at the drainage outlet. An expansion joint is provided at the top of the steel plate. A steel fiber reinforced concrete layer is provided at the top of the reinforced concrete culvert pipe. The expansion joint includes an expansion joint channel steel fixed at the top of the steel plate. An embedded groove is provided on the upper inner wall of the expansion joint channel steel. An elastic baffle is fixed in the embedded groove. The inner end of the elastic baffle has an upward arc bend. There is a gap between the elastic baffles on both sides. A concrete base plate is provided at the bottom of the reinforced concrete culvert pipe. A graded sand and gravel replacement layer is provided below the concrete base plate. Two layers of bidirectional polyester geogrid are laid between the graded sand and gravel replacement layer and the concrete base plate.

[0005] As a preferred option, the foundation trench is stepped, with the width of the foundation trench above the surface layer and the base layer being greater than the width of the foundation trench on the roadbed. The lower part of the foundation trench in the surface layer and the upper part of the foundation trench in the base layer are filled with a rigid-flexible transition concrete layer, and the steel fiber reinforced concrete layer is located above the rigid-flexible transition concrete layer, resulting in a stable structure.

[0006] As a preferred option, the top of the rigid-flexible transition concrete layer is flush with the top of the reinforced concrete culvert pipe. At the joint between the reinforced concrete culvert pipe and the top of the rigid-flexible transition concrete layer, there are dummy joint filling grooves on both sides to facilitate settlement. The dummy joint filling grooves are filled with a rubber asphalt stress absorption layer, which can absorb and disperse the stress generated by concrete shrinkage, delay the expansion of cracks, and also play a certain role in waterproofing, preventing water from seeping into the base layer and affecting the stability of the base layer.

[0007] As a preferred option, a polyester filament geotextile layer is provided below the rubber asphalt stress-absorbing layer. It can effectively disperse stress and has little impact on the increase of pavement structure layer thickness. An elastic rubber pad layer is provided between the reinforced concrete culvert pipe and the concrete substrate, which can absorb the stress generated by the small deformation of the foundation and avoid cracks at the bottom of the culvert due to rigid contact.

[0008] As a preferred embodiment, the reinforced concrete culvert pipe is equipped with limiting posts on both sides. The lower end of the limiting posts is inserted into the subgrade, and the top of the limiting posts is flush with the top of the base course. The limiting posts constrain the lateral displacement of the surrounding soil layers, preventing the reinforced concrete culvert pipe from settling due to lateral soil movement.

[0009] As a preferred embodiment, the bottom outer side of the steel plate is provided with a fixed flange, and the outer wall of the fixed flange is provided with a slot for the water supply and drainage outlet end to be inserted. The inner side of the slot is provided with a waterproof pad, which makes it easier to weld and fix the steel plate, and the waterproof pad can prevent water leakage.

[0010] As a preferred option, the bottom of the expansion joint channel steel is provided with a fixing groove for inserting the top of the steel plate, and a fixing steel bar frame is fixed on the outer side wall of the expansion joint channel steel, making the expansion joint more secure.

[0011] This utility model has the following beneficial effects:

[0012] By installing elastic baffles on the inner side of the upper part of the expansion joint channel steel, debris can be blocked in the groove area on the outer side of the elastic baffles, thus better preventing blockage. Furthermore, a concrete base plate, a graded sand and gravel replacement layer, and a bidirectional polyester geogrid are installed at the bottom of the reinforced concrete culvert pipe. The graded sand and gravel replacement layer improves the overall rigidity of the foundation, reduces uneven settlement, and disperses stress. The bidirectional polyester geogrid, through its binding effect, diffuses the load at the bottom of the culvert to the surrounding soil, enhances the shear resistance of the foundation soil, and suppresses local settlement. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model;

[0014] Figure 2 for Figure 1 Partial structural diagram;

[0015] Figure 3 for Figure 1 Enlarged structural diagram at point A;

[0016] In the diagram: 1. Base layer; 2. Surface layer; 3. Steel fiber reinforced concrete layer; 4. Rigid-flexible transition concrete layer; 5. Fixed steel reinforcement frame; 6. Elastic baffle; 7. Expansion joint channel steel; 8. Steel plate; 9. Reinforced concrete culvert pipe; 10. Limiting post; 11. Subgrade; 12. Drainage steel culvert pipe; 13. Elastic rubber pad layer; 14. Concrete substrate; 15. Graded sand and gravel replacement layer; 16. Biaxial polyester geogrid; 17. Polyester filament geotextile layer; 18. Rubber asphalt stress-absorbing layer; 19. Fixed flange; 20. Slot; 21. Waterproof pad. Detailed Implementation

[0017] The present invention will be further described below with reference to the embodiments.

[0018] Example 1, as Figures 1 to 3 As shown, this utility model is a culvert pipe anti-clogging and drainage structure, including a reinforced concrete culvert pipe 9 cast in the foundation trench of the roadbed 11, base layer 1 and surface layer 2. A drainage steel culvert pipe 12 is provided in the inner hole of the reinforced concrete culvert pipe 9. A drainage outlet is provided at the top of the drainage steel culvert pipe 12. A steel plate 8 is fixed to the drainage outlet. An expansion joint is provided at the top of the steel plate 8. A steel fiber reinforced concrete layer 3 is provided at the top of the reinforced concrete culvert pipe 9. The expansion joint includes an expansion joint channel steel 7 fixed to the top of the steel plate 8. An embedded groove is provided on the upper inner wall of the expansion joint channel steel 7. An elastic baffle 6 is fixed in the embedded groove. The inner end of the elastic baffle 6 is provided with an upward arc bend. There is a gap between the elastic baffles 6 on both sides. A concrete base plate 14 is provided at the bottom of the reinforced concrete culvert pipe 9. A graded sand and gravel replacement layer 15 is provided below the concrete base plate 14. Two layers of bidirectional polyester geogrid 16 are laid between the graded sand and gravel replacement layer 15 and the concrete base plate 14.

[0019] During construction, trenches are excavated on the roadbed 11, base course 1, and surface course 2 according to the marked positions. The upper width of the trench is greater than the lower width. Then, a graded sand and gravel replacement layer 15 is filled at the bottom of the trench. The thickness of the graded sand and gravel replacement layer 15 is 30-50cm, and the particle size is 5-20mm. It is compacted in layers with a compaction degree ≥96%. Then, two layers of bidirectional polyester geogrid 16 are laid on top. A concrete substrate 14 is poured on top of the bidirectional polyester geogrid 16. Then, the internal steel bars of the reinforced concrete culvert pipe 9 are tied on top of the concrete substrate 14. Then, the drainage steel culvert pipe 12 is hoisted onto the steel bars for support and fixation. The steel plate 8 is vertically upward. Then, the reinforced concrete culvert pipe 9 is poured. After the pouring is completed, an expansion joint is welded and fixed on the top of the steel plate 8. Then, the steel fiber concrete layer 3 is poured.

[0020] In Example 2, based on Example 1, the foundation trench is stepped. The width of the foundation trench in the upper part of the surface layer 2 and the base layer 1 is greater than the width of the foundation trench on the roadbed 11. The lower part of the foundation trench in the surface layer 2 and the upper part of the foundation trench in the base layer 1 are filled with a rigid-flexible transition concrete layer 4, and the steel fiber reinforced concrete layer 3 is located above the rigid-flexible transition concrete layer 4. The wall thickness of the drainage steel culvert pipe 12 is about 15mm. The rigid-flexible transition concrete layer 4 is C50 concrete. After the reinforced concrete culvert pipe 9 is poured, the rigid-flexible transition concrete layer 4 is poured on the upper outer side of the reinforced concrete culvert pipe 9.

[0021] The top of the rigid-flexible transition concrete layer 4 is flush with the top of the reinforced concrete culvert pipe 9. At the joint between the top of the reinforced concrete culvert pipe 9 and the top of the rigid-flexible transition concrete layer 4, dummy joint filling grooves are provided on both sides to accommodate settlement. A rubber asphalt stress-absorbing layer 18 is placed inside these grooves. These dummy joint filling grooves are pre-reserved at the top joint during the pouring of the rigid-flexible transition concrete layer 4 and the reinforced concrete culvert pipe 9. After the pouring of the rigid-flexible transition concrete layer 4 and the reinforced concrete culvert pipe 9, the rubber asphalt stress-absorbing layer 18 is laid inside the pre-reserved dummy joint filling grooves, typically with a thickness of 2-3 cm. The elastic baffle 6 can be an elastic metal sheet, and its top is lower than the top of the surface layer 2.

[0022] Below the rubber asphalt stress-absorbing layer 18, a polyester filament geotextile layer 17 is provided, and an elastic rubber pad layer 13 is provided between the reinforced concrete culvert pipe 9 and the concrete substrate 14. Before laying the rubber asphalt stress-absorbing layer 18, the polyester filament geotextile layer 17 is first laid in the dummy joint filling groove, and the thickness of the polyester filament geotextile layer 17 is about 0.5 cm.

[0023] Limiting posts 10 are provided on both sides of the reinforced concrete culvert pipe 9. The lower end of the limiting post 10 is inserted into the roadbed 11, and the top of the limiting post 10 is flush with the top of the base layer 1. The limiting posts 10 are inserted on both sides after the reinforced concrete culvert pipe 9 is poured.

[0024] The bottom outer side of the steel plate 8 is provided with a fixed flange 19. The outer wall of the fixed flange 19 is provided with a slot 20 for the water supply and drainage outlet end to be inserted. The inner side of the slot 20 is provided with a waterproof pad 21. Before the drainage steel culvert pipe 12 is hoisted, the slot 20 of the fixed flange 19 can be inserted into the drainage outlet end and then welded and fixed.

[0025] The bottom of the expansion joint channel steel 7 is provided with a fixing groove for the top of the steel plate 8 to be inserted, and a fixing steel bar frame 5 is fixed on the outer wall of the expansion joint channel steel 7. During installation, the fixing groove at the bottom of the expansion joint channel steel 7 is inserted into the top of the steel plate 8, and then welded to fix it.

[0026] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0027] In the description of this utility model, the terms "inner", "outer", "longitudinal", "transverse", "upper", "lower", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not require that this utility model must be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

Claims

1. A culvert anti-blocking drainage structure, comprising a reinforced concrete culvert pipe (9) cast in a trench of a roadbed (11), a base layer (1), and a surface layer (2), wherein a drainage steel culvert pipe (12) is provided in the inner hole of the reinforced concrete culvert pipe (9), a drainage outlet is provided at the top of the drainage steel culvert pipe (12), a steel plate (8) is fixed to the drainage outlet, an expansion joint is provided at the top of the steel plate (8), and a steel fiber reinforced concrete layer (3) is provided at the top of the reinforced concrete culvert pipe (9), characterized in that: The expansion joint includes an expansion joint channel steel (7) fixed on the top of the steel plate (8). The upper inner wall of the expansion joint channel steel (7) is provided with an embedded groove. An elastic baffle (6) is fixed in the embedded groove. The inner end of the elastic baffle (6) is provided with an upward arc bend. There is a gap between the elastic baffles (6) on both sides. The bottom of the reinforced concrete culvert pipe (9) is provided with a concrete substrate (14). A graded sand and gravel replacement layer (15) is provided below the concrete substrate (14). Two layers of bidirectional polyester geogrid (16) are laid between the graded sand and gravel replacement layer (15) and the concrete substrate (14).

2. The culvert pipe anti-clogging drainage structure according to claim 1, characterized in that: The foundation trench is stepped. The width of the foundation trench on the surface layer (2) and the base layer (1) is greater than the width of the foundation trench on the roadbed (11). The lower part of the foundation trench in the surface layer (2) and the upper part of the foundation trench in the base layer (1) are filled with a rigid-flexible transition concrete layer (4). The steel fiber concrete layer (3) is located above the rigid-flexible transition concrete layer (4).

3. The culvert pipe anti-clogging drainage structure according to claim 2, characterized in that: The top of the rigid-flexible transition concrete layer (4) is flush with the top of the reinforced concrete culvert pipe (9). At the joint between the reinforced concrete culvert pipe (9) and the top of the rigid-flexible transition concrete layer (4), there are dummy joint filling grooves on the left and right sides. A rubber asphalt stress absorption layer (18) is provided in the dummy joint filling groove.

4. The culvert pipe anti-clogging drainage structure according to claim 3, characterized in that: A polyester filament geotextile layer (17) is provided below the rubber asphalt stress-absorbing layer (18), and an elastic rubber pad layer (13) is provided between the reinforced concrete culvert pipe (9) and the concrete substrate (14).

5. The culvert pipe anti-clogging drainage structure according to claim 1, characterized in that: The reinforced concrete culvert pipe (9) is provided with limiting posts (10) on both sides. The lower end of the limiting post (10) is inserted into the roadbed (11), and the top of the limiting post (10) is flush with the top of the base layer (1).

6. The culvert pipe anti-clogging drainage structure according to claim 1, characterized in that: The bottom outer side of the steel plate (8) is provided with a fixed flange (19), and the outer wall of the fixed flange (19) is provided with a slot (20) for the water supply and drainage port to be inserted. The inner side of the slot (20) is provided with a waterproof pad (21).

7. The culvert pipe anti-clogging drainage structure according to claim 1, characterized in that: The bottom of the expansion joint channel steel (7) is provided with a fixing groove for inserting the top of the steel plate (8), and a fixing steel bar frame (5) is fixed on the outer side wall of the expansion joint channel steel (7).

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