Cantilever assembly type pavement structure suitable for rock narrow roadbed

Abstract

The utility model discloses a cantilever assembly type pavement structure suitable for a rock narrow roadbed, which comprises a prefabricated panel and an L-shaped retaining wall, the L-shaped retaining wall is used for being arranged on the roadbed matched with the assembly type pavement structure and located on one side of the roadbed far away from an abrupt slope, and the top of the L-shaped retaining wall is flush with the roadbed; the side, close to the abrupt slope, of the roadbed is provided with a balancing weight, the prefabricated panel is installed on the roadbed and located above the L-shaped retaining wall, the prefabricated panel is provided with a plurality of first anchor cables, and the first anchor cables penetrate through the prefabricated panel and the balancing weight and are arranged in the roadbed in a penetrating mode. A plurality of second anchor cables are arranged on the L-shaped retaining wall, and the first anchor cables penetrate through the L-shaped retaining wall and the roadbed and are arranged in the abrupt slope in a penetrating mode. The method has the advantages that when the narrow rock roadbed is widened, the number of cut excavation earth and stones is reduced, the investment scale is reduced, and the method better adapts to terrains.

Description

Technical Field

[0001] The utility model relates to the field of subgrade construction, in particular to a cantilever prefabricated pavement structure suitable for a narrow rocky subgrade. Background Art

[0002] When highway construction passes through alpine and canyon areas, especially sections that require excavation of rocky slopes, the excessive cut slopes of the roadbed cause great disturbance to the original natural slopes. After excavation, overall reinforcement, protection and large-scale waste disposal are required, resulting in large investment, and it runs counter to the current environmental protection concept.

[0003] For sections with steep terrain for route extension, traditional solutions generally use large-volume concrete projects such as gravity retaining walls and anti-slide piles to form the subgrade. The project scale is huge, the implementation difficulty is great, the investment benefit is low, and it may even be impossible to implement due to terrain constraints. Summary of the Utility Model

[0004] In order to solve the problems existing in the subgrade at steep slopes and widen the subgrade, the present application provides a cantilever prefabricated pavement structure suitable for a narrow rocky subgrade.

[0005] The cantilever prefabricated pavement structure suitable for a narrow rocky subgrade provided by the present application adopts the following technical solutions:

[0006] A cantilever prefabricated pavement structure suitable for a narrow rocky subgrade includes a precast panel and an L-shaped retaining wall. The L-shaped retaining wall is used to be arranged on the subgrade used in cooperation with the prefabricated pavement structure and located on the side of the subgrade away from the steep slope, and the top of the L-shaped retaining wall is flush with the subgrade; a counterweight is arranged on the side of the subgrade close to the steep slope, the precast panel is installed on the subgrade and above the L-shaped retaining wall, and a plurality of first anchor cables are arranged on the precast panel. Each first anchor cable passes through the precast panel and the counterweight and penetrates into the subgrade; a plurality of second anchor cables are arranged on the L-shaped retaining wall, and the second anchor cables pass through the L-shaped retaining wall and the subgrade and penetrate into the steep slope.

[0007] By adopting the above technical solutions, after anchoring the L-shaped retaining wall on the steep slope, then installing the precast panel on the subgrade, and then only need to drive the anchor cables to stabilize the precast panel; using the anchor cables to fix the precast panel to form a new road surface, effectively reducing the structures such as embedment depth, apron and semi-infinite body of the anchorage section required by conventional gravity retaining walls and anti-slide pile projects, replacing the traditional solutions of large-scale filling and excavation, large-volume masonry or bridge structures, not only reducing the amount of earthwork excavation for the road cut, reducing the investment scale, but also better effectively adapting to the terrain.

[0008] Preferably, a plain concrete base layer is laid on the subgrade.

[0009] By adopting the above technical solution, plain concrete is laid on the roadbed to level and fix the roadbed surface, facilitating the construction of precast panels.

[0010] Preferably, a leveling layer is provided on the top of the precast panel, and a paving layer is provided on the top of the leveling layer.

[0011] By adopting the above technical solution, the leveling layer is used to level the surface of the precast panel, and then the paving layer is used to buffer the vehicle wheels and disperse the concentrated load brought by the vehicle, enabling the vehicle to have a better driving experience when driving on the precast panel while protecting the precast panel.

[0012] Preferably, a stress absorption layer is provided between the roadbed and the precast panel.

[0013] By adopting the above technical solution, during the use of the precast panel, it will be affected by ground deformation or temperature change. The stress absorption layer can absorb and disperse the stress caused by the deformation and temperature change of the precast panel, improving the crack resistance of the precast panel.

[0014] Preferably, the precast panel includes a plurality of panel monomers arranged along the length direction of the roadbed, and the assembled pavement structure further includes a splicing component for splicing two adjacent panel monomers.

[0015] By adopting the above technical solution, the precast panel is divided into several panel monomers and spliced using the splicing component, making the installation and maintenance of the entire pavement structure more convenient and flexible; at the same time, this design also adapts to the requirements of roadbeds of different lengths and widths, improving the practicality of the precast panel.

[0016] Preferably, the splicing component includes joint steel bars and joint concrete. The joint steel bars are embedded at both ends of each panel monomer along the length direction of the roadbed, and the joint concrete is poured between two adjacent panel monomers and wraps each joint steel bar.

[0017] By adopting the above technical solution, the wet joint method is used to connect the joint steel bars on two adjacent precast panels. Under the rigid connection of reinforced concrete, the tight connection between adjacent panel monomers is ensured, enhancing the integrity and stability of the pavement structure.

[0018] Preferably, the length of the panel monomer along the length direction of the roadbed is 10m, and the width of the panel monomer along the direction perpendicular to the length direction of the roadbed is 10m.

[0019] By adopting the above technical solution, the specific dimensions of the panel monomer are given. This dimension design takes into account both the convenience of transportation and installation and the bearing capacity and stability of the pavement structure.

[0020] Preferably, a reinforced concrete guardrail is provided on one side of the precast panel away from the steep slope.

[0021] By adopting the above technical solutions, the safety of the road surface structure is enhanced. Especially in the case of a vehicle out of control or a pedestrian straying in, etc., it can effectively prevent people or vehicles from falling down the steep slope.

[0022] To sum up, the present application includes at least one of the following beneficial technical effects:

[0023] 1. By the solution of the precast cantilever road surface structure, replacing the traditional solutions of large-scale filling and excavation, large-volume masonry works or bridge structures, not only the quantity of cut and fill earthwork for roadbed excavation is reduced, the investment scale is lowered, but also it can better and effectively adapt to the terrain.

[0024] 2. This solution is applicable to both widening of existing roads and construction of new roads. For the project of widening and reconstructing existing roads, the original roadbed can be fully utilized, and the roadbed can be widened by the cantilever precast road surface structure to avoid excavation or high retaining wall structures; for new roads, the quantity of earthwork and protection works can be reduced, the difficulty of project implementation can be lowered, and the project benefits can be maximized. Description of the Drawings

[0025] Figure 1 is a cross-sectional view of the cantilever precast road surface structure of the embodiment of the present application.

[0026] Figure 2 is a top view of the precast panel of the cantilever road surface assembly structure of the embodiment of the present application.

[0027] Description of the Reference Numerals:

[0028] 1. Precast panel; 11. Counterweight block; 12. Levelling layer; 13. Paving layer; 14. First anchor cable; 15. Panel unit; 2. L-shaped retaining wall; 21. Second anchor cable; 3. Plain concrete foundation layer; 4. Stress absorption layer; 5. Splicing steel bars. Detailed Description of the Embodiment

[0029] The following further elaborates on the present application in conjunction with the attached Figure 1-2 for a more detailed description.

[0030] The embodiment of the present application discloses a cantilever precast road surface structure applicable to a narrow rock roadbed. Refer to Figure 1 and Figure 2, the cantilever precast pavement structure applicable to narrow rocky subgrades includes a precast panel 1 and an L-shaped retaining wall 2. The L-shaped retaining wall 2 is used to be arranged on the subgrade used in conjunction with the precast pavement structure and is located on the side of the subgrade away from the steep slope. The top of the L-shaped retaining wall 2 is flush with the subgrade. A plain concrete base layer 3 is paved on the part of the subgrade without the L-shaped retaining wall 2. After paving, the original subgrade can be leveled to facilitate the next process; a stress absorption layer 4 is paved on both the plain concrete base layer 3 and the L-shaped retaining wall 2. The stress absorption layer 4 can absorb the deformation at the subgrade and the stress generated by temperature changes, thereby reducing the influence of the stress on the precast panel 1;

[0031] A counterweight 11 is arranged on the side of the subgrade close to the steep slope. The precast panel 1 is installed on the subgrade and is located above the L-shaped retaining wall 2. In this embodiment, the precast panel 1 is a precast reinforced concrete panel; a leveling layer 12 is arranged on the top of the precast panel 1, and a paving layer 13 is arranged on the top of the leveling layer 12; the side of the precast panel 1 away from the steep slope extends beyond the L-shaped retaining wall 2 and forms a cantilever beam. In this embodiment, the length of the cantilever beam is less than or equal to 3m; a reinforced concrete guardrail is arranged on the side of the precast panel 1 away from the steep slope.

[0032] A number of first anchor cables 14 are arranged on the precast panel 1. Each first anchor cable 14 passes through the precast panel 1 and the counterweight 11 and penetrates into the subgrade; a number of second anchor cables 21 are arranged on the L-shaped retaining wall 2. The second anchor cables 21 pass through the L-shaped retaining wall 2 and the subgrade and penetrate into the steep slope.

[0033] The precast panel 1 includes a number of panel monomers 15 arranged along the length direction of the subgrade. The precast pavement structure further includes a splicing component for splicing two adjacent panel monomers 15; the splicing component includes joint steel bars and joint concrete. Joint steel bars are embedded at both ends of each panel monomer 15 along the length direction of the subgrade, and joint concrete is poured between two adjacent panel monomers 15 and wraps each joint steel bar.

[0034] The length of the panel monomer 15 along the length direction of the subgrade is 10m, and the width of the panel monomer 15 along the direction perpendicular to the length direction of the subgrade is 10m.

[0035] The specific construction plan of a cantilever precast pavement structure applicable to narrow rocky subgrades in an embodiment of this application is as follows:

[0036] S1: Excavate part of the rocky subgrade according to the design elevation of the subgrade to form a preliminary working platform; provide a foundation for subsequent retaining wall construction.

[0037] S2: Build a hanging basket anchoring system, and trim the construction surface of the L-shaped retaining wall 2 through the working surface extended by the hanging basket; by building a hanging basket anchoring system, a stable working surface can be provided, and construction in high-altitude or steep areas can be carried out safely and efficiently, facilitating workers to trim the construction surface of the retaining wall.

[0038] S3: Install a drilling rig on the working face of the hanging basket and drill the anchor hole for the second anchor bolt.

[0039] S4: Insert the anchor bolt into the drilled hole and inject cement slurry.

[0040] S5: After the strength of the anchor bolt reaches more than 70%, install the anchor plate and use the anchor plate to anchor and install the structural steel bars and formwork of the L-shaped retaining wall 2.

[0041] S6: Pour the concrete of the L-shaped retaining wall 2. After the wall strength reaches 80% of the design strength, tension the second anchor bolt and fix the end of the second anchor bolt.

[0042] S7: Position the drilling rig and drill the anchor hole for the first anchor bolt.

[0043] S8: After pouring the plain concrete foundation layer 3, lay a 4-cm-thick asphalt layer on the upper part of the L-shaped retaining wall 2 and the plain concrete foundation layer 3 as the stress absorption layer 4.

[0044] S9: Install the precast panel 1 through a hoisting device, and leave a 2-m space between each panel unit 15 for connecting adjacent panel units 15 through the joint concrete and joint steel bars.

[0045] S10: After installing the precast panel 1, insert the anchor bolt into the reserved hole of the precast panel 1 and grout it. After the strength reaches 70%, fix the anchor plate.

[0046] S11: Install the reinforced concrete guardrail and lay the road surface leveling layer 12 and paving layer 13.

[0047] The above are all the preferred embodiments of this application. The protection scope of this application is not limited by this. Therefore, all equivalent changes made according to the structure, shape, and principle of this application shall be covered within the protection scope of this application.

Claims

1. A cantilever prefabricated pavement structure applicable to narrow rocky roadbeds, characterized in that, It includes a precast panel (1) and an L-shaped retaining wall (2). The L-shaped retaining wall (2) is used to be arranged on the subgrade for use with the assembled pavement structure and is located on the side of the subgrade away from the steep slope. The top of the L-shaped retaining wall (2) is flush with the subgrade. A counterweight (11) is arranged on the side of the subgrade close to the steep slope. The precast panel (1) is installed on the subgrade and is located above the L-shaped retaining wall (2). A number of first anchor cables (14) are arranged on the precast panel (1). Each of the first anchor cables (14) passes through the precast panel (1) and the counterweight (11) and penetrates into the subgrade. A number of second anchor cables (21) are arranged on the L-shaped retaining wall (2). The second anchor cables (21) pass through the L-shaped retaining wall (2) and the subgrade and penetrate into the steep slope.

2. The cantilever prefabricated pavement structure applicable to a narrow rocky roadbed according to claim 1, wherein A plain concrete base layer (3) is paved on the subgrade.

3. The cantilever prefabricated pavement structure applicable to narrow rocky roadbeds according to claim 1, characterized in that, A leveling layer (12) is arranged on the top of the precast panel (1), and a paving layer (13) is arranged on the top of the leveling layer (12).

4. A cantilever prefabricated pavement structure applicable to a narrow rocky roadbed according to claim 1, characterized in that, A stress absorption layer (4) is arranged between the subgrade and the precast panel (1).

5. The cantilever prefabricated pavement structure applicable to narrow rocky roadbeds according to claim 1, wherein The precast panel (1) includes a number of panel monomers (15) arranged in a row along the length direction of the subgrade. The assembled pavement structure further includes a splicing component for splicing two adjacent panel monomers (15).

6. The cantilever prefabricated pavement structure applicable to narrow rocky roadbeds according to claim 5, wherein The splicing component includes joint steel bars and joint concrete. The joint steel bars are embedded at both ends of each panel monomer (15) along the length direction of the subgrade. The joint concrete is poured between two adjacent panel monomers (15) and wraps each of the joint steel bars.

7. A cantilever prefabricated pavement structure applicable to a narrow rocky roadbed according to claim 5, characterized in that The length of the panel monomer (15) along the length direction of the subgrade is 10 m, and the width of the panel monomer (15) along the direction perpendicular to the length direction of the subgrade is 10 m.

8. The cantilever prefabricated pavement structure applicable to narrow rocky roadbeds according to claim 1, characterized in that, A reinforced concrete guardrail is arranged on the side of the precast panel (1) away from the steep slope.

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