Roadbed structure for soft foundation backfilling
By adopting semi-rigid gravel layers and multiple sets of roadbed main structures in the soft base backfill roadbed structure, combined with the oblique tension of the flexible grille layer, the problem of large differences in the height of the roadbed structure in the existing technology is solved, and the uniformity of road settlement and the stability of the road are achieved.
Patent Information
- Application Number
- CN202421748671.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-23
- Publication Date
- 2025-05-27
- Estimated Expiration
- 2034-07-23
AI Technical Summary
In the prior art, the soft-base backfill roadbed structure is prone to large differences in pit height after long-term use, which affects the safety and stability of road use.
A semi-rigid gravel layer is used as the base, and multiple sets of roadbed main structures are laid thereon, each group of structures including a rigid concrete layer, a first sand and soil layer, a flexible grille layer and a second sand and soil layer. The flexible grille layer provides oblique tension to reduce settlement height and avoid large differences in pit heights.
Through a uniformly sinking semi-rigid gravel layer and a widely compacted rigid concrete layer, ensure uniform settlement of the road surface at different locations, avoid large differences in pit heights, and improve the safety and stability of the road use.
Smart Images
Figure CN222908454U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of municipal highway construction, and more specifically, it relates to a subgrade structure for soft foundation backfill. Background Art
[0002] A soft foundation refers to a soft soil foundation section along the river pond. When building a highway along the river pond, it is necessary to first excavate and remove the soft soil, and then backfill a subgrade structure with high structural stability. Therefore, the stability of the subgrade structure for soft foundation backfill determines the use safety and stability of the highway along the river pond.
[0003] In the existing technology, the backfill method generally uses sandy soil for backfill, replacing the silt soil in the original soft foundation, and then compressing the backfilled sandy soil with a compaction device to transform the soft foundation into a stable and firm subgrade structure. However, although this subgrade has a certain stability, when the vehicles driving on the road surface are too heavy or the traffic time accumulates over time, the compacted foundation is also prone to sink. In particular, the sinking amplitude at the position of the vehicle tire is quite different from that at other positions on the road, resulting in serious potholes. Summary of the Utility Model
[0004] In view of the technical problem of serious height difference of potholes in the existing technology proposed in the background art, the utility model uses a semi-rigid gravel layer as the base, so that the gravel at each part of the bottom layer of the highway sinks more evenly during the process of sinking into the soft soil; then a rigid concrete layer is laid on the upper surface of the semi-rigid gravel layer. The surface of the gravel layer pressed by the rigid concrete layer is wider, and even when encountering pressures at different positions on the road surface, the settlement is more uniform, avoiding a large height difference of potholes. In addition, the flexible grid layer in the main body structure of the subgrade is actually a grid. When settlement occurs at a certain position in the sandy soil layer on the upper surface or the lower surface of the flexible grid layer, the flexible grid provides a certain oblique tension to reduce the settlement height at a specific position, further avoiding a large height difference of potholes.
[0005] To achieve the above object, the utility model provides the following technical solutions:
[0006] A subgrade structure for soft foundation backfill includes a semi-rigid gravel layer as the base and multiple groups of main body structures of the subgrade. The multiple groups of main body structures of the subgrade are stacked along the height direction of the subgrade. Each group of main body structures of the subgrade includes a rigid concrete layer, a first sandy soil layer, a flexible grid layer, and a second sandy soil layer. The rigid concrete layer is located at the bottom, the first sandy soil layer is laid on the upper surface of the rigid concrete layer, the flexible grid layer is laid on the upper surface of the first sandy soil layer, and the second sandy soil layer is laid on the upper surface of the flexible grid layer.
[0007] Through the above technical solution, the utility model uses a semi-rigid crushed stone layer as the base, so that the crushed stones at each part of the bottom layer of the road sink more evenly into the soft soil; then a rigid concrete layer is laid on the upper surface of the semi-rigid crushed stone layer. The surface of the crushed stone layer pressed by the rigid concrete layer is wider. Even when encountering pressures at different positions on the road surface, the settlement is more uniform, avoiding large differences in the height of the pits. In addition, the flexible grid layer in the main structure of the roadbed is actually a grid. When settlement occurs at a certain position in the sand and soil layer on the upper or lower surface of the flexible grid layer, the flexible grid provides a certain oblique tensile force, reducing the settlement height at a specific position and further avoiding large differences in the height of the pits.
[0008] Further, in the utility model: the semi-rigid crushed stone layer is composed of crushed stones, and the particle size of the crushed stones in the semi-rigid crushed stone layer is between 20 mm and 60 mm.
[0009] Further, in the utility model: the number of the main structures of the roadbed is set to be 2 to 5 groups.
[0010] Further, in the utility model: the rigid concrete layer is set as a precast concrete slab.
[0011] Further, in the utility model: the flexible grid layer is configured as a square grid.
[0012] Further, in the utility model: the size of the square in the flexible grid layer is between 10 cm and 20 cm.
[0013] Further, in the utility model: the flexible grid layer is made of hemp rope material or cotton thread material or polyester material or nylon material or plastic material.
[0014] In summary, the utility model has the following beneficial effects:
[0015] (1) The utility model uses a semi-rigid crushed stone layer as the base, so that the crushed stones at each part of the bottom layer of the road sink more evenly into the soft soil; then a rigid concrete layer is laid on the upper surface of the semi-rigid crushed stone layer. The surface of the crushed stone layer pressed by the rigid concrete layer is wider. Even when encountering pressures at different positions on the road surface, the settlement is more uniform, avoiding large differences in the height of the pits.
[0016] (2) The flexible grid layer in the main structure of the roadbed of the utility model is actually a grid. When settlement occurs at a certain position in the sand and soil layer on the upper or lower surface of the flexible grid layer, the flexible grid provides a certain oblique tensile force, reducing the settlement height at a specific position and further avoiding large differences in the height of the pits. Description of the Drawings
[0017] Figure 1 It is a schematic diagram of the roadbed structure for soft foundation backfill of the utility model.
[0018] Reference numerals: 1, semi-rigid gravel layer; 2, main subgrade structure; 2-1, rigid concrete layer; 2-2, first sand and gravel soil layer; 2-3, flexible grid layer; 2-4, second sand and gravel soil layer. Specific embodiments
[0019] The present utility model will be further described in detail below in conjunction with embodiments and the accompanying drawings, but the embodiments of the present utility model are not limited thereto.
[0020] A subgrade structure for soft foundation backfilling, as Figure 1 shown, the subgrade structure of the present utility model is arranged on one side of the river pond embankment dam. The dam usually adopts a rigid structure with a cast concrete structure. The subgrade structure of the present utility model includes a semi-rigid gravel layer 1 as the base and multiple groups of main subgrade structures 2. The multiple groups of main subgrade structures 2 are stacked along the height direction of the subgrade. Each group of main subgrade structures 2 includes a rigid concrete layer 2-1, a first sand and gravel soil layer 2-2, a flexible grid layer 2-3, and a second sand and gravel soil layer 2-4. The rigid concrete layer 2-1 is located at the bottom, the first sand and gravel soil layer 2-2 is laid on the upper surface of the rigid concrete layer 2-1, the flexible grid layer 2-3 is laid on the upper surface of the first sand and gravel soil layer 2-2, and the second sand and gravel soil layer 2-4 is laid on the upper surface of the flexible grid layer 2-3.
[0021] The semi-rigid gravel layer 1 is composed of gravel, and the particle size of the gravel in the semi-rigid gravel layer 1 is between 20 mm and 60 mm. The number of main subgrade structures 2 is set to 2 to 5 groups. In this embodiment, 2 groups of main subgrade structures 2 are selected for laying.
[0022] The rigid concrete layer 2-1 is set as a precast concrete slab. The flexible grid layer 2-3 is configured as a square grid. The size of the square in the flexible grid layer 2-3 is between 10 cm and 20 cm. The flexible grid layer 2-3 is made of hemp rope material or cotton thread material or polyester material or nylon material or plastic material.
[0023] The above are only the preferred embodiments of the present utility model. The protection scope of the present utility model is not limited to the above embodiments. All technical solutions falling within the idea of the present utility model belong to the protection scope of the present utility model. It should be noted that for those of ordinary skill in the art, several improvements and refinements made without departing from the principle of the present utility model should also be regarded as within the protection scope of the present utility model.
Claims
1. A roadbed structure for backfilling soft foundation, characterized in that: The invention comprises a semi-rigid crushed stone layer (1) as a base and a plurality of groups of roadbed main structures (2), wherein the plurality of groups of roadbed main structures (2) are stacked and arranged along the height direction of the roadbed, and each group of the roadbed main structures (2) comprises a rigid concrete layer (2-1), a first sandy soil layer (2-2), a flexible grid layer (2-3) and a second sandy soil layer (2-4), wherein the rigid concrete layer (2-1) is located at the bottom, the first sandy soil layer (2-2) is laid on the upper surface of the rigid concrete layer (2-1), the flexible grid layer (2-3) is laid on the upper surface of the first sandy soil layer (2-2), and the second sandy soil layer (2-4) is laid on the upper surface of the flexible grid layer (2-3).
2. A roadbed structure for backfilling soft foundation according to claim 1, characterized in that: The semi-rigid crushed stone layer (1) is composed of crushed stones, and the particle size of the crushed stones in the semi-rigid crushed stone layer (1) is between 20 mm and 60 mm.
3. A roadbed structure for backfilling soft foundation according to claim 1, characterized in that: The number of the main roadbed structures (2) is set to be 2 to 5 groups.
4. A roadbed structure for backfilling soft foundation according to claim 1, characterized in that: The rigid concrete layer (2-1) is configured as a precast concrete slab.
5. The roadbed structure for backfilling soft foundation according to claim 1, characterized in that: The flexible grid layer (2-3) is configured as a square grid.
6. A roadbed structure for backfilling soft foundation according to claim 1, characterized in that: The size of the square grids in the flexible grid layer (2-3) is between 10 cm and 20 cm.
7. The roadbed structure for backfilling soft foundation according to claim 1, characterized in that: The flexible grid layer (2-3) is made of hemp rope material, cotton thread material, polyester material, nylon material or plastic material.