Bridgehead approach embankment protection structure

Abstract

The utility model discloses a bridgehead approach bridge section roadbed protection structure, including light quality foam concrete roadbed, fabricated UHPC wall protection plate, basic structure, bridgehead approach bridge section pavement and auxiliary road pavement system, light quality foam concrete roadbed and bridgehead approach bridge section pavement set up at one side of fabricated UHPC wall protection plate, auxiliary road pavement system sets up at the other side of fabricated UHPC wall protection plate, and light quality foam concrete roadbed fills in the below of bridgehead approach bridge section pavement, and the basic structure sets up at one side of auxiliary road pavement system, and the bottom of fabricated UHPC wall protection plate is installed on the basic structure, and fabricated UHPC wall protection plate includes a plurality of UHPC panel that splices. The utility model discloses through light quality foam concrete roadbed, has reduced the settlement of bridgehead approach bridge section, and through fabricated UHPC wall protection plate, on one hand has strengthened the anticollision performance, has avoided the impact of light quality foam concrete roadbed from auxiliary road pavement system, has improved the durability and impact resistance of light quality foam concrete roadbed.

Description

Technical Field

[0001] This utility model relates to the field of bridge technology, and in particular to a roadbed protection structure for bridge approach sections. Background Technology

[0002] Currently, the approach bridge sections are prone to uneven settlement due to the difference in stiffness between the roadbed and the bridge structure, leading to the phenomenon of "bridge approach bumps". Lightweight foamed concrete (LFC) is lightweight and has good vertical compressive strength. If lightweight foamed concrete roadbed is used, the backfill load can be effectively reduced and settlement can be minimized.

[0003] However, lightweight foamed concrete has poor lateral impact resistance, requiring protective structures to improve durability and impact resistance. Traditional methods use ordinary concrete retaining walls or reinforced soil structures, which have problems such as heavy weight, easy cracking, and long construction period; at the same time, because they need to be cast in place, the construction efficiency is low and it is difficult to meet the needs of rapid assembly construction. Utility Model Content

[0004] The purpose of this utility model is to provide a roadbed protection structure for bridge approach sections, thereby solving the above-mentioned problems.

[0005] To achieve the above objectives, this utility model discloses a roadbed protection structure for a bridge approach section, comprising a lightweight foamed concrete roadbed, prefabricated UHPC retaining wall panels, a foundation structure, a bridge approach section pavement, and an auxiliary road pavement system. The lightweight foamed concrete roadbed and the bridge approach section pavement are located on one side of the prefabricated UHPC retaining wall panels, and the auxiliary road pavement system is located on the other side of the prefabricated UHPC retaining wall panels. The lightweight foamed concrete roadbed is filled below the bridge approach section pavement. The foundation structure is located on one side of the auxiliary road pavement system. The bottom of the prefabricated UHPC retaining wall panels is installed on the foundation structure. The prefabricated UHPC retaining wall panels include multiple spliced ​​UHPC panels.

[0006] Furthermore, it also includes an anchoring system, which includes vertical anchor rods, the upper end of which is anchored to the UHPC wall panel and the lower end of which is anchored to the foundation structure.

[0007] Furthermore, the basic structure is provided with a vertical groove structure, and the bottom of the UHPC panel is provided with a vertical tenon that cooperates with the vertical groove structure.

[0008] Furthermore, one of the two adjacent UHPC panels is provided with a horizontal groove structure, and the other is provided with a horizontal tenon that mates with the horizontal groove structure.

[0009] Furthermore, polyurethane elastic sealant is provided on the contact surfaces of two adjacent UHPC panels.

[0010] Furthermore, the auxiliary road surface system includes an auxiliary road asphalt pavement, a base course, curb stones, and a safety belt. The auxiliary road asphalt pavement, curb stones, and safety belt are installed on the base course. One side of the safety belt is connected to the prefabricated UHPC retaining wall panel and the foundation structure, and the other side is connected to one side of the curb stone. The other side of the curb stone is connected to the auxiliary road asphalt pavement.

[0011] Furthermore, the bottom of the UHPC panel extends into the lightweight foamed concrete subgrade to form a corner, and a drainage system is provided in the corner.

[0012] Furthermore, the drainage system includes a permeable geotextile and a drainage ditch connected to the existing drainage pipe at the bridgehead, with the permeable geotextile covering the drainage ditch.

[0013] Furthermore, the drainage ditch structure is formed by filling with graded crushed stone.

[0014] Furthermore, an asphalt layer is provided on the side of the lightweight foamed concrete subgrade near the prefabricated UHPC retaining wall panel, and the asphalt layer extends downwards above the drainage system.

[0015] Compared with the prior art, the advantages of this utility model are: This invention reduces settlement of the approach bridge section by using a lightweight foamed concrete subgrade. Furthermore, the prefabricated UHPC retaining wall panels enhance impact resistance, preventing damage from the auxiliary road surface system and improving the durability and impact resistance of the lightweight foamed concrete subgrade. Additionally, the prefabricated UHPC retaining wall panels reduce the weight and construction cost of the protective structure, offering higher installation efficiency and better project quality compared to cast-in-place retaining walls and soil backfilling.

[0016] The present invention will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings: Figure 1 This is a side view schematic diagram of the roadbed protection structure of the approach bridge section disclosed in an embodiment of this utility model.

[0018] Figure 2 This is a schematic diagram of the connection nodes of the UHPC wall panel disclosed in the embodiment of this utility model.

[0019] Figure 3 This is a schematic diagram of the UHPC panel connection disclosed in an embodiment of the present utility model.

[0020] Legend: 1. Lightweight foamed concrete subgrade; 2. Prefabricated UHPC wall panel; 21. UHPC panel; 22. Corner; 23. Vertical tenon and mortise; 24. Horizontal groove structure; 25. Polyurethane elastic sealant; 26. Horizontal tenon and mortise; 3. Anchoring system; 31. Vertical anchor; 4. Drainage system; 41. Permeable geotextile; 42. Drainage blind ditch; 43. Graded crushed stone; 5. Foundation structure; 51. Vertical groove structure; 6. Auxiliary road pavement system; 61. Auxiliary road asphalt pavement; 62. Base course; 63. Curbstone; 64. Safety belt; 7. Bridge approach road pavement; 8. Asphalt layer. Detailed Implementation

[0021] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered by the claims.

[0022] like Figure 1-3 As shown, this utility model discloses a roadbed protection structure for a bridge approach section, including a lightweight foamed concrete roadbed 1, prefabricated UHPC retaining wall panels 2, a foundation structure 5, an auxiliary road pavement system 6, and a bridge approach section pavement 7. The lightweight foamed concrete roadbed 1 has a dry density of 300-800 kg / m³. 3 The compressive strength is ≥0.5MPa. The concrete compressive strength of the prefabricated UHPC retaining wall panel 2 is ≥150MPa, and the panel thickness is 80-120mm. The foundation structure 5 is made of cement concrete. The lightweight foamed concrete subgrade 1 and the approach road surface 7 are set on one side of the prefabricated UHPC retaining wall panel 2, and the auxiliary road surface system 6 is set below the other side of the prefabricated UHPC retaining wall panel 2. The lightweight foamed concrete subgrade 1 is filled below the approach road surface 7, and the foundation structure 5 is set on one side of the auxiliary road surface system 6. The bottom of the prefabricated UHPC retaining wall panel 2 is installed on the foundation structure 5. The prefabricated UHPC retaining wall panel 2 includes multiple spliced ​​UHPC panels 21. This utility model enhances the anti-collision performance and reduces the overall structural cost and hoisting efficiency through the prefabricated UHPC retaining wall panel 2. At the same time, the use of prefabricated structure results in a shorter construction period compared to cast-in-place retaining walls and soil backfilling, thereby reducing the overall cost.

[0023] In this embodiment, to enhance the connection strength at the bottom of the prefabricated UHPC wall panel 2, an anchoring system 3 is also included. The anchoring system 3 includes vertical anchor rods 31, which are made of threaded steel. The upper end of the vertical anchor rods 31 is anchored to the UHPC panel 21, and the lower end is anchored to the foundation structure 5. Meanwhile, to improve installation accuracy and efficiency, a vertical groove structure 51 is provided on the foundation structure 5, and a vertical tenon 23 that mates with the vertical groove structure 51 is provided at the bottom of the UHPC panel 21.

[0024] In this embodiment, to achieve the connection between adjacent UHPC panels 21, one of the two adjacent UHPC panels 21 is provided with a transverse groove structure 24, and the other is provided with a transverse tenon 26 that mates with the transverse groove structure 24. Simultaneously, polyurethane elastic sealant 25 is provided on the contact surfaces of the two adjacent UHPC panels 21, thereby improving the overall sealing performance of the prefabricated UHPC wall panel 2 and also accommodating minor settlements of the lightweight foamed concrete subgrade 1.

[0025] In this embodiment, the auxiliary road surface system 6 includes an auxiliary road asphalt pavement 61, a base course 62, a curb 63, and a safety belt 64. The auxiliary road asphalt pavement 61, the curb 63, and the safety belt 64 are installed on the base course 62. One side of the safety belt 64 is connected to the prefabricated UHPC retaining wall panel 2 and the foundation structure 5, and the other side is connected to one side of the curb 63. The other side of the curb 63 is connected to the auxiliary road asphalt pavement 61 and is engaged with a step on the base course 62. The step improves the stability of the safety belt 64 and the bottom of the prefabricated UHPC retaining wall panel 2. The curb 63 and the safety belt 64 provide initial isolation and buffering in case of collision, transferring collision energy.

[0026] In this embodiment, a corner 22 is formed at the bottom of the UHPC panel 21 within the lightweight foamed concrete subgrade 1. A drainage system 4 is installed within the corner 22 to promptly drain water. Specifically, the corner 22 serves two purposes: firstly, it receives water flowing from between the lightweight foamed concrete subgrade 1 and the prefabricated UHPC wall panel 2, guiding the water into the drainage system 4; secondly, when the prefabricated UHPC wall panel 2 is subjected to an axial force (see attached diagram), it also serves to drain water from the subgrade. Figure 1For example, when a vehicle impacts the road surface 7 at the bridge approach, causing the prefabricated UHPC retaining wall panel 2 to tilt clockwise, the downward pressure from the lightweight foamed concrete subgrade 1 filled above the corner 22 can provide stability. Specifically, in this embodiment, the drainage system 4 includes a permeable geotextile 41 and a drainage blind ditch 42 connected to the existing drainage pipe at the bridge approach. The permeable geotextile 41 covers the drainage blind ditch 42 to prevent water from eroding the subgrade. The drainage blind ditch 42 is formed by filling it with graded crushed stone 43, which not only ensures drainage and reduces the construction cost of the drainage blind ditch 42, but also provides support and resistance to pressure. The longitudinal slope of the drainage blind ditch 42 flowing towards the existing drainage pipe at the bridge approach is not less than 2%.

[0027] In this embodiment, see Figure 1 Considering the poor lateral impact resistance of the lightweight foamed concrete subgrade 1, and to prevent water intrusion, an asphalt layer 8 is provided on the side of the lightweight foamed concrete subgrade 1 near the prefabricated UHPC retaining wall panel 2. The asphalt layer 8 has the dual effect of buffering and absorbing energy and waterproofing, thereby improving the durability and impact resistance of the lightweight foamed concrete subgrade 1. The asphalt layer 8 extends downwards above the drainage system 4, facilitating the smooth entry of water into the drainage system 4.

[0028] This embodiment then discloses a construction method for the roadbed protection structure of the bridge approach section, including some of the following steps: S1. Complete the construction of the base course 62 and asphalt pavement 61 of the auxiliary road surface system 6, and pour the foundation structure 5. S2. Precast UHPC panels 21 are hoisted onto the surface of the roadbed slope and assembled using vertical tenons 23, vertical anchors 31, and horizontal tenons 26. S3. Lay permeable geotextile 41 on the back of the wall panel, lay drainage blind ditch 42 at the bottom and backfill with graded crushed stone 43.

[0029] S4. Lightweight foamed concrete subgrade 1 is poured in layers, with each layer ≤0.5m thick, and cured to the design strength; S5. Fix by injecting grout of polyurethane elastic sealant 25.

[0030] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A roadbed protection structure for a bridge approach span, characterized in that, The system includes a lightweight foamed concrete subgrade (1), a prefabricated UHPC retaining wall panel (2), a foundation structure (5), an auxiliary road surface system (6), and a bridge approach section road surface (7). The lightweight foamed concrete subgrade (1) and the bridge approach section road surface (7) are located on one side of the prefabricated UHPC retaining wall panel (2), and the auxiliary road surface system (6) is located on the other side of the prefabricated UHPC retaining wall panel (2). The lightweight foamed concrete subgrade (1) is filled below the bridge approach section road surface (7). The foundation structure (5) is located on one side of the auxiliary road surface system (6). The bottom of the prefabricated UHPC retaining wall panel (2) is installed on the foundation structure (5). The prefabricated UHPC retaining wall panel (2) includes multiple spliced ​​UHPC panels (21).

2. The roadbed protection structure for the approach bridge section according to claim 1, characterized in that, It also includes an anchoring system (3), which includes a vertical anchor (31), the upper end of which is anchored to the UHPC panel (21) and the lower end of which is anchored to the foundation structure (5).

3. The roadbed protection structure for the approach bridge section according to claim 2, characterized in that, The base structure (5) is provided with a vertical groove structure (51), and the bottom of the UHPC panel (21) is provided with a vertical tenon (23) that cooperates with the vertical groove structure (51).

4. The roadbed protection structure for the approach bridge section according to claim 1, characterized in that, One of the two adjacent UHPC panels (21) is provided with a horizontal groove structure (24), and the other is provided with a horizontal tenon (26) that mates with the horizontal groove structure (24).

5. The roadbed protection structure for the approach bridge section according to claim 1, characterized in that, Polyurethane elastic sealant (25) is provided on the contact surfaces of two adjacent UHPC panels (21).

6. The roadbed protection structure for bridge approach sections according to any one of claims 1-5, characterized in that, The auxiliary road surface system (6) includes an auxiliary road asphalt pavement (61), a base layer (62), a curb (63), and a safety belt (64). The auxiliary road asphalt pavement (61), the curb (63), and the safety belt (64) are installed on the base layer (62). One side of the safety belt (64) is connected to the prefabricated UHPC retaining wall panel (2) and the foundation structure (5), and the other side is connected to one side of the curb (63). The other side of the curb (63) is connected to the auxiliary road asphalt pavement (61).

7. The roadbed protection structure for bridge approach sections according to any one of claims 1-5, characterized in that, The bottom of the UHPC panel (21) extends into the lightweight foamed concrete subgrade (1) to form a corner (22), and a drainage system (4) is provided in the corner (22).

8. The roadbed protection structure for the approach bridge section according to claim 7, characterized in that, The drainage system (4) includes a permeable geotextile (41) and a drainage blind ditch (42) connected to the existing drainage pipe at the bridgehead, with the permeable geotextile (41) covering the drainage blind ditch (42).

9. The roadbed protection structure for bridge approach sections according to claim 8, characterized in that, The drainage blind ditch (42) is formed by filling graded crushed stone (43) to form a drainage ditch structure.

10. The roadbed protection structure for the approach bridge section according to claim 7, characterized in that, The lightweight foamed concrete subgrade (1) has an asphalt layer (8) on the side near the prefabricated UHPC retaining wall panel (2), and the asphalt layer (8) extends downward above the drainage system (4).

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