Foam light soil structure suitable for soft soil roadbed

Abstract

The utility model relates to a foam light soil structure suitable for a soft soil roadbed. The foam light soil structure is located between a bridge structure and a roadbed structure. The structure is characterized by comprising a gravel cushion layer and a backfill base, an anti-seepage geomembrane; the foam light soil is poured between the anti-seepage geomembranes in a layered manner; the silk screen structures are arranged among the layers of foam light soil; the cement concrete is connected with the roadbed structure; wherein the anti-seepage geomembranes are respectively laid on the gravel cushion layer and the foam light soil; each layer of foam light soil is poured in sections, and deformation joints are formed among the sections of foam light soil; and the cement concrete is poured on the anti-seepage geomembrane above the cement concrete. The problem of uneven settlement of a soft soil roadbed section road in an existing scheme is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of highway roadbed filling, in particular to a foam lightweight soil structure suitable for soft soil roadbed. Background Art

[0002] Soft soil roadbeds are widespread and generally suffer from physical disadvantages such as high water content, high compressibility, and low shear strength. Significant differential settlement often occurs at the junctions between the roadbed and abutments, as well as at roadbed widening sections in soft soil areas. This significantly reduces the service life of roads and poses significant challenges to the safety and stability of road projects.

[0003] Traditional soft foundation treatment solutions often have long construction periods, complex processes, and high project costs. Currently, commonly used treatment solutions mainly include preloading, backfilling, cement mixing piles, high-strength concrete pipe piles, etc. Among them, preloading mainly applies pressure in advance to discharge the pore water in the soil, causing the foundation to settle in advance. The preloading period is long, and it is necessary to allocate earthwork for preloading, and the effect of controlling uneven settlement is generally poor. Backfilling is to partially or completely remove the soft soil and replace it with other materials to increase the bearing capacity of the foundation. However, after backfilling, the excavated soft soil needs to be abandoned, which has a greater impact on the surrounding environment. In addition, the excavation and backfilling of deep soft soil are more difficult and there are safety hazards. Cement mixing piles are made by mixing cement slurry with soft soil in the foundation, while high-strength concrete pipe piles are directly driven into the foundation by machinery. Both can improve the overall strength of the foundation and reduce the settlement caused by additional loads after the roadbed is filled. However, both solutions require special construction machinery, the on-site construction process is complex, the construction quality is difficult to control, the construction period is long, and the project cost is high, making it difficult to promote and use on a large scale.

[0004] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present disclosure, and therefore may include information that does not constitute prior art known to ordinary technicians in the field. Utility Model Content

[0005] In view of the above shortcomings of the prior art, the purpose of the present invention is to provide a foam lightweight soil structure suitable for soft soil roadbed, so as to solve the problem of uneven settlement of soft soil roadbed sections in the prior art.

[0006] To achieve the above purpose, the technical solution of the utility model is as follows:

[0007] A foam lightweight soil structure suitable for soft soil roadbed; located between a bridge structure (4) and a roadbed structure (2); comprising:

[0008] Gravel cushion layer, backfill base; anti-seepage geomembrane; foam lightweight soil, poured in layers between the anti-seepage geomembrane; wire mesh structure, set between each layer of foam lightweight soil; cement concrete, connecting the roadbed structure;

[0009] The anti-seepage geomembrane is laid on the gravel cushion layer and the foam lightweight soil respectively; each layer of the foam lightweight soil is poured in sections, and deformation joints are formed between each section of the foam lightweight soil; the cement concrete is poured on the anti-seepage geomembrane above.

[0010] A further technical solution is that a pavement structure is laid on the foam lightweight soil structure suitable for soft soil roadbed; the pavement structure is paved on the cement concrete and the roadbed structure.

[0011] A further technical solution is that the thickness of the gravel cushion layer is 20 cm; the anti-seepage geomembrane is overlapped and laid on the gravel cushion layer and the foam lightweight soil, and the overlap width is not less than 10 cm.

[0012] A further technical solution is that the thickness of the foam lightweight soil single layer pouring is 0.3-1.0m; the pouring volume of each layer of the foam lightweight soil does not exceed 200m 3 The pouring area of ​​each layer of foam lightweight soil shall not exceed 400m 2 .

[0013] A further technical solution is that the deformation joints are arranged at intervals of 10-15m; and foam plastic boards are filled in the deformation joints.

[0014] A further technical solution is that the foam lightweight soil and the roadbed structure are connected by a step; the step width is not greater than 100 cm; and the step height is not greater than 60 cm.

[0015] A further technical solution is that the foamed lightweight soil has a 28d compressive strength of ≥1Mpa, 520kg / m 3 ≤Wet density≤600kg / m 3 .

[0016] A further technical solution is that the 28d compressive strength of the cement concrete is ≥25Mpa; the cement concrete is connected to the roadbed structure through a steel-plastic grid; and the laying width of the steel-plastic grid is not less than 4m.

[0017] Compared with the existing technology, the beneficial technical effects of the utility model are as follows: (1) It is suitable for the foam lightweight soil structure of soft soil roadbed. By adopting foam lightweight soil material instead of traditional roadbed filling material, the dead weight of the roadbed structure is reduced, the roadbed settlement can be effectively reduced, and the overall stability of the pavement structure is improved, thereby extending the road construction period.

[0018] (2) The foam lightweight soil structure design is adopted to effectively control the base treatment, foam lightweight soil pouring method and the connection with the roadbed structure, thereby improving the road's ability to resist uneven deformation and improving the overall stability of the pavement structure.

[0019] (3) The foam lightweight soil is filled in layers and sections. A wire mesh structure is set between each layer of foam lightweight soil, and deformation joints are set between each section of foam lightweight soil to improve the foam lightweight soil's ability to resist deformation and reduce the occurrence of subsidence and cracks. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The longitudinal section structure diagram of the foam lightweight soil structure suitable for soft soil roadbed of the utility model example is shown.

[0021] Markings in the attached figure: 1. Foam lightweight soil; 10. Expansion joint; 11. Gravel cushion layer; 2. Roadbed structure; 4. Bridge structure; 5. Pavement structure; 6. Steel-plastic grid; 7. Cement concrete; 8. Anti-seepage geomembrane; 9. Wire mesh structure. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the present invention clearer, the device proposed in the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. According to the following description, the advantages and features of the present invention will be clearer. It should be noted that the accompanying drawings adopt a very simplified form and use non-precise proportions, which are only used to conveniently and clearly assist in explaining the purpose of the implementation method of the present invention. In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, please refer to the accompanying drawings. It should be noted that the structure, proportion, size, etc. illustrated in the drawings of this specification are only used to match the content disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no technical substantive significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed in the present invention without affecting the efficacy and purpose that can be achieved by the present invention.

[0023] Figure 1 The longitudinal section of the foam lightweight soil structure of the utility model is shown in FIG. Figure 1 As shown, the utility model discloses a foam lightweight soil structure suitable for soft soil roadbed.

[0024] A foamed lightweight soil structure suitable for soft soil roadbed is located between a bridge structure 4 and a roadbed structure 2. The foamed lightweight soil structure suitable for soft soil roadbed comprises: an impermeable geomembrane 8, a gravel cushion 11 as a backfill base, foamed lightweight soil 1 layered and poured between the impermeable geomembrane 8, a wire mesh structure 9 disposed between the layers of foamed lightweight soil 1, and cement concrete 7 connecting the roadbed structure 2.

[0025] The anti-seepage geomembrane 8 is laid on the gravel cushion 11 and the foamed lightweight soil 1. Each layer of foamed lightweight soil 1 is poured in sections, forming expansion joints 10 between each section of foamed lightweight soil 1. Cement concrete 7 is poured on the upper anti-seepage geomembrane 8.

[0026] The base must be flat, compacted, and free of impurities and water. The gravel backfill layer 11 should be 20 cm thick. The geomembrane 8 should be laid in an overlapping pattern on top of the gravel backfill layer 11. The overlap should be no less than 10 cm. Preferably, the geomembrane 8 should be laid horizontally.

[0027] The foamed lightweight soil 1 is poured in a single layer with a thickness of 0.3-1.0 m. Expansion joints 10 are arranged on the foamed lightweight soil 1 at intervals of 10-15 m. The expansion joints 10 are filled with foam plastic sheets. Preferably, the foam plastic sheets are 2 cm thick.

[0028] A step is excavated on the roadbed structure 2, and a step is formed on the corresponding foam lightweight soil 1 to achieve a step connection between the foam lightweight soil 1 and the roadbed structure 2. The step width is not greater than 100 cm; the step height is not greater than 60 cm.

[0029] Foam lightweight soil 1 needs to ensure 28d compressive strength ≥ 1Mpa, 520kg / m3 ≤ wet density ≤ 600kg / m3. The pouring volume of each layer of foam lightweight soil 1 shall not exceed 200m 3 The pouring area of ​​each layer of foam lightweight soil shall not exceed 400m 2 Preferably, the wire mesh structure 9 is a steel wire mesh, a galvanized steel wire mesh, or a wire mesh of other materials that reinforces the structure of the foam lightweight soil 1 .

[0030] The anti-seepage geomembrane 8 is laid on the foam lightweight soil 1 in an overlapping manner, with an overlapping width of not less than 10 cm. Preferably, the anti-seepage geomembrane 8 is laid horizontally.

[0031] Cement concrete 7 is leveled on the upper anti-seepage geomembrane 8. The cement concrete 7 needs to ensure a 28d compressive strength of ≥ 25 MPa. The cement concrete 7 is connected to the roadbed structure 2 through the steel-plastic grid 6. The laying width of the steel-plastic grid 6 is not less than 4m.

[0032] A pavement structure 5 is laid on the foam lightweight soil structure suitable for soft soil roadbed. The pavement structure 5 is paved on the cement concrete 7 and the roadbed structure 2.

[0033] The specific workflow of this utility model is as follows:

[0034] First, mix the foam lightweight soil 1. Then, clean the pouring area to ensure the base is flat, compacted, and free of water. Next, add the gravel cushion layer 11 and lay the waterproof geomembrane 8. The foam lightweight soil 1 should be poured in layers and sections, with each layer ranging from 0.3 to 1.0 meters thick and each section ranging from 10 to 15 meters long. Preferably, each layer is 0.5 meters thick. A wire mesh structure 9 is placed between each layer, and expansion joints 10 are formed between each section. After pouring the foam lightweight soil 1, lay the waterproof geomembrane 8 on top of the foam lightweight soil 1, and then pour cement concrete 7 for leveling. Then, install the steel-plastic grid 6 between the cement concrete 7 and the roadbed structure 2. Preferably, the steel-plastic grid 6 is 4 meters wide. Accordingly, the steel-plastic grid 6 on the cement concrete 7 is 2 meters wide, and the steel-plastic grid 6 on the roadbed structure 2 is 2 meters wide.

[0035] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0036] The above-described embodiments merely represent several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present utility model patent shall be determined by the appended claims.

Claims

1. A foam lightweight soil structure suitable for soft soil roadbed, located between a bridge structure (4) and a roadbed structure (2); characterized in that: include: Gravel cushion layer (11), backfill base; Anti-seepage geomembrane (8); Foamed lightweight soil (1) is poured in layers between the anti-seepage geomembranes (8); A wire mesh structure (9) is arranged between the layers of the foam lightweight soil (1); Cement concrete (7) connecting the roadbed structure (2); The anti-seepage geomembrane (8) is laid on the gravel cushion layer (11) and the foam lightweight soil (1) respectively; each layer of the foam lightweight soil (1) is poured in sections, and deformation joints (10) are formed between each section of the foam lightweight soil (1); and the cement concrete (7) is poured on the upper anti-seepage geomembrane (8).

2. The foam lightweight soil structure suitable for soft soil roadbed according to claim 1, characterized in that: A pavement structure (5) is laid on a foam lightweight soil structure suitable for a soft soil roadbed; the pavement structure (5) is laid on the cement concrete (7) and the roadbed structure (2).

3. The foam lightweight soil structure suitable for soft soil roadbed according to claim 1, characterized in that: The thickness of the gravel cushion layer (11) is 20 cm; the anti-seepage geomembrane (8) is laid on the gravel cushion layer (11) and the foam lightweight soil (1) in an overlapping manner, with an overlapping width of not less than 10 cm.

4. The foam lightweight soil structure suitable for soft soil roadbed according to claim 1, characterized in that: The foamed lightweight soil (1) has a single-layer pouring thickness of 0.3-1.0 m; the pouring volume of each layer of the foamed lightweight soil (1) does not exceed 200 m 3 The pouring area of ​​each layer of foamed lightweight soil (1) does not exceed 400m 2 .

5. The foam lightweight soil structure suitable for soft soil roadbed according to claim 4, characterized in that: The deformation joints (10) are arranged at intervals of 10-15 m; and the deformation joints (10) are filled with foam plastic boards.

6. The foam lightweight soil structure suitable for soft soil roadbed according to claim 4, characterized in that: The foam lightweight soil (1) and the roadbed structure (2) are connected by a step; the step width is no greater than 100 cm; and the step height is no greater than 60 cm.

7. The foam lightweight soil structure suitable for soft soil roadbed according to claim 4, characterized in that: The foamed lightweight soil (1) has a 28d compressive strength of ≥1Mpa, 520kg / m 3 ≤Wet density≤600kg / m 3 .

8. The foam lightweight soil structure suitable for soft soil roadbed according to claim 3, characterized in that: The 28d compressive strength of the cement concrete (7) is ≥25Mpa; the cement concrete (7) is connected to the roadbed structure (2) via a steel-plastic grid (6); and the laying width of the steel-plastic grid (6) is not less than 4m.

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