Expansion project pavement connection structure
By setting up steps and support structures on the old roadbed and new roadbed, the problem of weak concrete structure at the connection between the old roadbed is solved, and the overall stability and construction quality of the roadbed are improved.
Patent Information
- Application Number
- CN202420966442.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-07
- Publication Date
- 2024-12-20
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
In the prior art, the concrete structure at the connection between the old and new roadbeds is weak, which can easily lead to cracks, roadbed instability and degradation of roadbed structure performance, posing overall safety hazards.
A step structure is adopted to set up on the old roadbed and the new roadbed, and a support structure is set up in the new roadbed, including the lower support plate, vertical rod and upper support plate, to support the second concrete layer, add support rods and connecting rods, and use L-shaped Connect the plate and the second grille to improve connection stability.
By controlling the shear deformation and lateral displacement of the roadbed, it reduces settlement after construction, improves the integrity and stability of the new and old roadbeds, and improves the construction quality.
Smart Images
Figure CN222205895U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of road construction, and in particular to a road surface connection structure for an expansion project. Background Art
[0002] With the continuous increase in transportation volume and the increasing demand for social and economic development, many roads in my country can no longer meet the needs of social development due to factors such as the social economy and technical level at the time of construction, and have experienced road damage and traffic congestion. More and more roads need to be renovated or even rerouted, but from an economic perspective, renovation and widening on the original route is one of the relatively better options.
[0003] However, the handling of the connection between the new and old roadbeds has become a weak link in quality control during highway construction, and the overall safety of the roadbed and pavement structure is at risk. When connecting the new and old roadbeds, usually only concrete structures are used, resulting in a weak connection structure that is prone to cracks, which can easily lead to instability of the widened roadbed, damage to the pavement, and degradation of the pavement's structural and overall performance. Utility Model Content
[0004] In order to solve the above problems, the present application provides a road surface connection structure for an expansion project.
[0005] This application provides a road connection structure for the expansion project, using the following technical solutions:
[0006] A pavement connection structure for an expansion project comprises a foundation, an old roadbed and a new roadbed laid on the foundation, wherein the old roadbed is provided with a plurality of steps at the connection with the new roadbed, the foundation is paved with a first grid, the new roadbed comprises a multi-layer pavement structure laid on the foundation, and the pavement structure is laid on the first grid, the pavement structure comprises a crushed stone layer, a first concrete layer, a sand cushion layer and a second concrete layer laid on the first grid in sequence from bottom to top, the foundation is provided with a retaining structure, the lower end of the retaining structure is located below the first grid, the upper end of the retaining structure is penetrated through the crushed stone layer, the first concrete layer and the sand cushion layer, and the second concrete layer is laid on the upper surface of the retaining structure.
[0007] Optionally, the supporting structure includes a plurality of lower support plates, a plurality of vertical rods and a plurality of upper support plates, the lower support plates abut against the foundation and are located below the first grid, the lower ends of the vertical rods are fixedly connected to the lower support plates, the upper ends of the vertical rods are fixedly connected to the upper support plates, and the second concrete layer is laid above the upper support plates.
[0008] Optionally, a second grid is laid at the junction of the sand cushion layer and the second concrete layer, and the upper surface of the upper support plate contacts the lower surface of the second grid.
[0009] Optionally, an L-shaped connecting plate is provided at the step, and the connecting plate includes a vertical plate and a horizontal plate. A sunken trough is opened on the old roadbed near the step, and a plurality of strip holes are opened in the horizontal direction on the vertical plate. The end of the second grille is passed through the strip holes and extends into the sunken trough. The horizontal plate is located above the sunken trough and its lower surface abuts against the upper surface of the second grille.
[0010] Optionally, connecting rods are fixedly connected between adjacent vertical rods.
[0011] Optionally, the first grid is provided with a plurality of fixing rods, the fixing rods are arranged in an inverted U-shape, the fixing rods are pressed against the first grid, and both ends of the fixing rods are inserted into the foundation.
[0012] In summary, the present application includes the following beneficial technical effects: by opening a number of steps on the old roadbed and the new roadbed, and setting up a supporting structure in the new roadbed, the lateral displacement of the roadbed due to shear deformation is controlled, thereby reducing the post-construction settlement of the roadbed, improving the integrity and stability between the new and old roadbeds, and greatly improving the overall construction quality of the roadbed. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application.
[0014] Figure 2 It is a structural schematic diagram of the supporting structure in the embodiment of the present application.
[0015] Figure 3 yes Figure 1 A partial enlarged schematic diagram of part A.
[0016] Figure 4 It is a schematic diagram of the structure of the vertical plate in the embodiment of the present application.
[0017] Explanation of the reference numerals in the accompanying drawings: 1. foundation; 2. old roadbed; 3. new roadbed; 4. steps; 5. first grid; 51. fixing rod; 6. pavement structure; 61. gravel layer; 62. first concrete layer; 63. sand cushion layer; 64. second concrete layer; 7. second grid; 8. retaining structure; 81. lower support plate; 82. vertical rod; 83. upper support plate; 84. connecting rod; 9. connecting plate; 91. vertical plate; 92. horizontal plate; 21. sinking trough; 911. strip hole. DETAILED DESCRIPTION
[0018] The following is combined with Figure 1-4 This application is described in further detail.
[0019] The embodiment of the present application discloses a road surface connection structure for an expansion project.
[0020] Reference Figure 1The pavement connection structure of the expansion project includes a foundation 1, an old roadbed 2 and a new roadbed 3 laid on the foundation 1, a plurality of steps 4 are provided at the connection between the old roadbed 2 and the new roadbed 3, a first grid 5 is laid on the foundation 1, a plurality of fixing rods 51 are connected to the first grid 5, and the fixing rods 51 are arranged in an inverted U shape, the fixing rods 51 are pressed against the first grid 5, and the two ends of the fixing rods 51 are inserted into the foundation 1, so as to position the first grid 5. The new roadbed 3 includes a multi-layer pavement structure 6 laid on the foundation 1, the pavement structure 6 is laid on the first grid 5, and the pavement structure 6 includes a crushed stone layer 61, a first concrete layer 62, a sand cushion layer 63 and a second concrete layer 64 laid on the first grid 5 from bottom to top, wherein a second grid 7 is laid at the junction of the sand cushion layer 63 and the second concrete layer 64, and both the first grid 5 and the second grid 7 are glass fiber grids.
[0021] Reference Figure 1 and Figure 2 The foundation 1 is provided with a retaining structure 8, which includes a plurality of lower support plates 81, a plurality of vertical rods 82 and a plurality of upper support plates 83. The lower surface of the lower support plate 81 is pressed against the foundation 1, and the lower support plate 81 is located below the first grid 5. The lower ends of the vertical rods 82 are fixed to the upper surface of the lower support plate 81. The vertical rods 82 penetrate the gravel layer 61, the first concrete layer 62 and the sand cushion layer 63. The upper ends of the vertical rods 82 are fixed to the lower surface of the upper support plate 83. The upper surface of the upper support plate 83 contacts the lower surface of the second grid 7, thereby playing a supporting role. Secondly, a horizontal connecting rod 84 is welded between two adjacent vertical rods 82 to make the vertical rods 82 more stable.
[0022] Reference Figure 3 and Figure 4 An L-shaped connecting plate 9 is provided at the step 4, and the connecting plate 9 includes a vertical plate 91 and a horizontal plate 92 vertically fixed to the upper end of the vertical plate 91. A sinking groove 21 is opened near the step 4 in the old roadbed 2. The vertical plate 91 is provided with a plurality of strip holes 911 in the horizontal direction. The end of the second grille 7 is passed through the strip holes 911 and extends into the sinking groove 21. The lower surface of the horizontal plate 92 is pressed against the portion of the second grille 7 extending into the sinking groove 21, and the upper surface of the horizontal plate 92 is flush with the surface of the old roadbed 2, thereby improving the stability of the connection between the new and old roadbeds 2.
[0023] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.
Claims
1. A road surface connection structure for an expansion project, characterized in that: The invention comprises a foundation (1), an old roadbed (2) and a new roadbed (3) laid on the foundation (1), wherein the old roadbed (2) is provided with a plurality of steps (4) at the junction with the new roadbed (3), the foundation (1) is provided with a first grid (5), the new roadbed (3) comprises a multi-layer pavement structure (6) laid on the foundation (1), and the pavement structure (6) is laid on the first grid (5), and the pavement structure (6) comprises a plurality of layers of pavement (6) laid on the first grid from bottom to top. A crushed stone layer (61), a first concrete layer (62), a sand cushion layer (63) and a second concrete layer (64) are provided on the grille (5); the foundation (1) is provided with a retaining structure (8); the lower end of the retaining structure (8) is located below the first grille (5); the upper end of the retaining structure (8) is penetrated by the crushed stone layer (61), the first concrete layer (62) and the sand cushion layer (63); and the second concrete layer (64) is laid on the upper surface of the retaining structure (8).
2. The pavement connection structure for expansion projects according to claim 1, characterized in that: The retaining structure (8) comprises a plurality of lower support plates (81), a plurality of vertical rods (82) and a plurality of upper support plates (83); the lower support plates (81) are in contact with the foundation (1) and are located below the first grid (5); the lower ends of the vertical rods (82) are fixedly connected to the lower support plates (81); the upper ends of the vertical rods (82) are fixedly connected to the upper support plates (83); and the second concrete layer (64) is laid above the upper support plates (83).
3. The road surface connection structure for expansion engineering according to claim 2 is characterized in that: A second grid (7) is laid at the junction of the sand cushion layer (63) and the second concrete layer (64), and the upper surface of the upper support plate (83) contacts the lower surface of the second grid (7).
4. The road surface connection structure for expansion engineering according to claim 3 is characterized in that: An L-shaped connecting plate (9) is provided at the step (4), and the connecting plate (9) includes a vertical plate (91) and a horizontal plate (92). A sinking groove (21) is provided on the old roadbed (2) near the step (4), and a plurality of strip holes (911) are provided through the vertical plate (91) in a transverse direction. The end of the second grille (7) is passed through the strip holes (911) and extends into the sinking groove (21). The horizontal plate (92) is located above the sinking groove (21) and its lower surface abuts against the upper surface of the second grille (7).
5. The road surface connection structure for expansion engineering according to claim 2 is characterized in that: A connecting rod (84) is fixedly connected between adjacent vertical rods (82).
6. The road surface connection structure for expansion engineering according to claim 1, characterized in that: The first grid (5) is provided with a plurality of fixing rods (51), the fixing rods (51) are arranged in an inverted U shape, the fixing rods (51) are pressed against the first grid (5), and both ends of the fixing rods (51) are inserted into the foundation (1).