Composite highway silty-fine sand roadbed structure

Abstract

The utility model relates to the technical field of roadbeds, in particular to a composite highway silty-fine sand roadbed structure which comprises an embankment layer, a frame lattice beam is laid on the top of the embankment layer, a plurality of reinforcing pile bodies are poured in the frame lattice beam, a cement stabilized macadam layer is laid above the top of the frame lattice beam, and a plurality of reinforcing pile bodies are poured in the cement stabilized macadam layer. The top of the reinforcing pile body is fixedly connected with a cement stabilized macadam layer, a roadbed reinforcing layer is laid on the top of the cement stabilized macadam layer, a glass fiber grid is laid on the top of the roadbed reinforcing layer, and a roadbed filler layer is laid on the top of the glass fiber grid; according to the composite type road silty-fine sand roadbed structure, by adopting a multi-layer composite type silty-fine sand filling structure and combining different types of structure layers, the overall structure is more stable, and the influence of external loads and the natural environment is better resisted; and meanwhile, the stability of the bottom structure is enhanced, and the uniform effect of bearing distribution is improved, so that the roadbed can bear large load.

Description

Technical Field

[0001] The utility model relates to the technical field of roadbed, in particular to a composite highway powder fine sand roadbed structure. Background Art

[0002] In the practice of highway subgrade filling, due to the influence of multiple factors such as construction site characteristics and construction raw material limitations, silty fine sand filling construction often occurs in highway subgrade construction projects. In order to ensure the construction quality and construction reliability of silty fine sand subgrade filling construction, certain construction requirements are imposed on the specific performance of silty fine sand filling materials.

[0003] Traditional silty fine sand roadbed has poor stability, and its overall stability may be limited by material properties. Moreover, the mechanical properties of the roadbed structure are relatively simple and may not be able to meet the complex and variable load requirements. This will cause the roadbed to be excessively deformed or damaged in some cases, shortening the service life of the highway. Therefore, a composite highway silty fine sand roadbed structure is proposed to address the above problems. Utility Model Content

[0004] The problem solved by the present invention is to provide a composite highway fine sand roadbed structure. By adopting a multi-layer composite fine sand filling structure and combining different types of structural layers, the overall structure is made more stable and better able to resist the influence of external loads and the natural environment; at the same time, by strengthening the stability of the bottom structure and improving the uniformity of the load distribution, it is beneficial for the roadbed to withstand larger loads.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0006] A composite highway silt-fine sand roadbed structure comprises an embankment layer, a frame lattice beam is laid on the top of the embankment layer, and a plurality of reinforcement piles are cast inside the frame lattice beam, a cement-stabilized gravel layer is laid above the top of the frame lattice beam, and the tops of the reinforcement piles are fixedly connected to the cement-stabilized gravel layer, a roadbed reinforcement layer is laid above the top of the cement-stabilized gravel layer, a glass fiber grid is laid on the top of the roadbed reinforcement layer, and a roadbed filler layer is laid on the top of the glass fiber grid, and a modified soil edging layer is laid on the outside of the cement-stabilized gravel layer, the roadbed reinforcement layer, the glass fiber grid and the roadbed filler layer;

[0007] The embankment layer includes plain soil, the inner bottom of the plain soil is filled with a first silt sand base layer, and the first silt sand base layer is filled with fine sand; the top of the first silt sand base layer is filled with two layers of wire mesh, and the space between the two layers of wire mesh is filled with lightweight foam soil, and the top of the wire mesh on top of the lightweight foam soil is filled with a second silt sand base layer, and the second silt sand base layer is filled with silty sand.

[0008] Furthermore, the raw soil is selected from soil particles with a maximum particle size of 10-15 mm; by selecting soil with good particle grading, the construction requirements can be effectively met; the first fine sand base layer and the second fine sand base layer need to be aired on site during filling; the actual moisture content in the filling sand is controlled to be 5%-9%, and the moderate moisture content is beneficial to the stability and durability of the roadbed.

[0009] Furthermore, the roadbed filling layer is a cement-improved soil filling layer; the soil is sandy and has a low liquid limit clay, a cement content of 4%, and a maximum dry density of 1.860 g / cm 3 The optimal moisture content is 14.0%, and the 7-day unconfined strength is 0.9MPa; the surface particle size is uniform and the flatness is high; and it can effectively reduce the surface cracks of the structural layer, reduce the risk of damage, and extend the service life of the roadbed.

[0010] Furthermore, the modified soil edging layer is a lime-modified soil filling layer containing medium expansive soil; the water content of the lime-modified soil is 28%, and the bearing strength of the medium expansive soil is 13.4%; the lime-modified soil has good anti-seepage ability, effectively resists atmospheric weathering, and effectively avoids the deterioration of soil properties caused by rainwater infiltration, thereby ensuring the stability of the roadbed.

[0011] Furthermore, the roadbed reinforcement layer includes a gap-filling crushed stone subbase layer, which is laid on top of the cement-stabilized crushed stone layer, and a third silt-fine sand base layer is laid on top of the gap-filling crushed stone subbase layer, a mortared flagstone base layer is laid on top of the third silt-fine sand base layer, and a fourth silt-fine sand base layer is laid on top of the mortared flagstone base layer; by providing the roadbed reinforcement layer, the structural stability of the roadbed can be effectively improved, and the overall structure can be more solid; at the same time, the filling is dense, which effectively improves the structural strength and reduces the deformation of the roadbed.

[0012] Furthermore, a non-woven needle-punched geotextile is laid on the top of the fourth fine sand base layer, and a glass fiber grid is laid on top of the non-woven needle-punched geotextile; the non-woven needle-punched geotextile can have a good water-retaining effect and effectively reduce water penetration.

[0013] The beneficial effects of the utility model are as follows: the composite highway fine sand roadbed structure adopts a multi-layer composite fine sand filling structure and combines different types of structural layers, so that the overall structure is more stable, better resists the influence of external loads and natural environment, and extends the service life of the highway roadbed; at the same time, the composite roadbed structure can make full use of the mechanical properties of different material layers to achieve complementary advantages; by using materials with high strength and stability for the bottom layer, by strengthening the stability of the bottom structure and improving the uniformity of load distribution, it is beneficial for the roadbed to withstand a larger load; and using a structural layer with good drainage for the surface layer, it is convenient to drain water, filter water and block water, reduce water seepage, and help reduce roadbed settlement and damage caused by water erosion. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0015] Figure 2 This is the overall front view of the utility model;

[0016] Figure 3 It is an overall cross-sectional view of the present utility model.

[0017] Legend:

[0018] 1. Embankment layer; 2. Frame lattice beam; 3. Reinforced piles; 4. Cement-stabilized gravel layer; 5. Roadbed reinforcement layer; 6. Fiberglass grid; 7. Roadbed filler layer; 8. Modified soil edging layer; 11. Plain soil; 12. First silt-fine sand base layer; 13. Wire mesh; 14. Lightweight foam soil; 15. Second silt-fine sand base layer; 51. Gap-filling gravel subbase layer; 52. Third silt-fine sand base layer; 53. Mortared flagstone base layer; 54. Fourth silt-fine sand base layer; 55. Non-woven needle-punched geotextile. DETAILED DESCRIPTION

[0019] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0020] Specific examples are given below.

[0021] See also Figures 1 to 3The composite highway silt and fine sand roadbed structure comprises: an embankment layer 1, wherein the embankment layer 1 comprises plain soil 11, the inner bottom of the plain soil 11 is filled with a first silt and fine sand base layer 12, and the first silt and fine sand base layer 12 is filled with fine sand; the top of the first silt and fine sand base layer 12 is filled with two layers of steel mesh 13, and the space between the two layers of steel mesh 13 is filled with lightweight foam soil 14, and the top of the steel mesh 13 on the top of the lightweight foam soil 14 is filled with a second silt and fine sand base layer 15, and the second silt and fine sand base layer 15 is filled with silt sand; by setting the embankment layer 1, the overall load stability and anti-deformation strength of the embankment can be effectively guaranteed, and the first silt and fine sand base layer 12 and the second silt and fine sand base layer 15 are used to fill the lightweight foam soil 14, and the steel mesh 13 is used to protect and cover the lightweight foam soil 14, so that the embankment layer 1 can effectively resist landslide damage caused by rainwater erosion; so that the embankment layer 1 has a good anti-deformation effect;

[0022] The raw soil 11 is made of soil particles with a maximum particle size of 10-15 mm. By selecting soil with good particle gradation, construction requirements can be effectively met. The first fine sand base layer 12 and the second fine sand base layer 15 need to be air-dried on site during filling. The actual moisture content of the filling sand is controlled to 5%-9%. A moderate moisture content is beneficial to the stability and durability of the roadbed.

[0023] The top of the embankment layer 1 is paved with a frame lattice beam 2, and a number of reinforcement piles 3 are cast inside the frame lattice beam 2. The top of the embankment layer 1 can be reinforced by the reinforcement piles 3 and the frame lattice beam 2, and the bearing effect on the top of the embankment layer 1 is effectively evenly distributed, so that the embankment layer 1 has good bearing stability effect; a cement stabilized gravel layer 4 is paved above the top of the frame lattice beam 2, and the top of the reinforcement pile 3 is fixedly connected to the cement stabilized gravel layer 4, and a roadbed reinforcement layer 5 is paved above the top of the cement stabilized gravel layer 4. 3 and the cement-stabilized crushed stone layer 4 effectively improve the construction stability of the roadbed reinforcement layer 5, and facilitate the construction of the roadbed reinforcement layer 5; a glass fiber grid 6 is laid on the top of the roadbed reinforcement layer 5, and a roadbed filler layer 7 is laid on the top of the glass fiber grid 6. The glass fiber grid 6 can have a good water filtering effect, effectively avoiding the damage caused by the impact of accumulated water to the roadbed reinforcement layer 5, thereby improving the stability of the roadbed filler layer 7; a modified soil edge layer 8 is laid on the outside of the cement-stabilized crushed stone layer 4, the roadbed reinforcement layer 5, the glass fiber grid 6 and the roadbed filler layer 7;

[0024] The roadbed reinforcement layer 5 includes a filling gravel subbase 51, which is laid on the top of the cement stabilized gravel layer 4, and a third fine sand base 52 is laid on the top of the filling gravel subbase 51, a mortared slab stone base 53 is laid on the top of the third fine sand base 52, and a fourth fine sand base 54 is laid on the top of the mortared slab stone base 53, and a non-woven needle-punched geotextile 55 is laid on the top of the fourth fine sand base 54, and a glass fiber grid 6 is laid on the top of the non-woven needle-punched geotextile 55; the filling gravel subbase 51 and the mortared slab stone base 53 can improve the roadbed reinforcement layer 51. The bearing effect of the roadbed substructure is improved by filling the gaps between the interstitial crushed stone subbase 51 and the mortar-laid flaking stone subbase 53 with the third fine sand base 52 and the fourth fine sand base 54, which can improve the overall density and reduce the deformation of the interstitial crushed stone subbase 51 and the mortar-laid flaking stone subbase 53, making the roadbed structure more stable. The roadbed reinforcement layer 5 can effectively improve the structural stability of the roadbed and make it more solid as a whole. At the same time, the dense filling effectively improves the structural strength and reduces the deformation of the roadbed. The non-woven needle-punched geotextile 55 can have a good water-retaining effect and effectively reduce the penetration of water.

[0025] The roadbed filling layer 7 is a cement-improved soil filling layer; the soil is sandy and has a low liquid limit clay, a cement content of 4%, and a maximum dry density of 1.860g / cm 3 The optimum moisture content is 14.0%, and the 7-day unconfined strength is 0.9 MPa. The surface particle size is uniform and the flatness is high. It can effectively reduce the surface cracks of the structural layer, reduce the risk of damage, and extend the service life of the roadbed.

[0026] The modified soil edging layer 8 is a lime-modified soil filling layer containing medium expansive soil; the water content of the lime-modified soil is 28%, and the bearing strength of the medium expansive soil is 13.4%; the lime-modified soil has good anti-seepage ability, effectively resists atmospheric weathering, and effectively prevents rainwater infiltration from causing deterioration of soil properties, thereby ensuring the stability of the roadbed.

[0027] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. Composite highway fine sand roadbed structure, characterized by: The invention comprises an embankment layer (1), a frame lattice beam (2) is laid on the top of the embankment layer (1), and a plurality of reinforcement piles (3) are cast inside the frame lattice beam (2), a cement-stabilized gravel layer (4) is laid above the top of the frame lattice beam (2), and the tops of the reinforcement piles (3) are fixedly connected to the cement-stabilized gravel layer (4), a roadbed reinforcement layer (5) is laid above the top of the cement-stabilized gravel layer (4), a glass fiber grid (6) is laid on the top of the roadbed reinforcement layer (5), and a roadbed filling layer (7) is laid on the top of the glass fiber grid (6), and a modified soil edge layer (8) is laid on the outside of the cement-stabilized gravel layer (4), the roadbed reinforcement layer (5), the glass fiber grid (6) and the roadbed filling layer (7); The embankment layer (1) includes plain soil (11), the inner bottom of the plain soil (11) is filled with a first silt sand base layer (12), and the first silt sand base layer (12) is filled with fine sand; the top of the first silt sand base layer (12) is filled with two layers of steel wire mesh (13), and the space between the two layers of steel wire mesh (13) is filled with lightweight foam soil (14), and the top of the steel wire mesh (13) on the top of the lightweight foam soil (14) is filled with a second silt sand base layer (15), and the second silt sand base layer (15) is filled with silt sand.

2. The composite highway fine sand roadbed structure according to claim 1, characterized in that: The raw soil (11) is selected from soil particles with a maximum particle size of 10-15 mm; the first fine sand base layer (12) and the second fine sand base layer (15) need to be air-dried on site during filling.

3. The composite highway fine sand roadbed structure according to claim 2, characterized in that: The roadbed filling layer (7) is a cement-improved soil filling layer.

4. The composite highway fine sand roadbed structure according to claim 3, characterized in that: The modified soil edge layer (8) is a lime-modified soil filling layer containing medium expansive soil.

5. The composite highway fine sand roadbed structure according to claim 4, characterized in that: The roadbed reinforcement layer (5) comprises a gap-filling crushed stone subbase (51), the gap-filling crushed stone subbase (51) being laid on top of the cement-stabilized crushed stone layer (4), and a third fine sand base (52) being laid on top of the gap-filling crushed stone subbase (51), a mortared slate base (53) being laid on top of the third fine sand base (52), and a fourth fine sand base (54) being laid on top of the mortared slate base (53).

6. The composite highway fine sand roadbed structure according to claim 5, characterized in that: A non-woven needle-punched geotextile (55) is laid on the top of the fourth fine sand base layer (54), and a glass fiber grid (6) is laid on top of the non-woven needle-punched geotextile (55).

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