Roadbed based on bubble light soil

Abstract

The utility model provides a roadbed based on bubble light soil. The roadbed comprises an original roadbed, a protective wall arranged on one side of the original roadbed and a filling roadbed arranged between the original roadbed and the protective wall. The subgrade is constructed by using the light bubble soil as the filling soil, so that the purpose of reducing the filling soil load or not increasing the filling soil load can be achieved, the bearing pressure of the subgrade is effectively reduced, the situation of large settlement difference of a new subgrade and an old subgrade caused by post-construction settlement is reduced, and the adverse effect on the safety of surrounding buildings is avoided. Meanwhile, through the arrangement of a reinforced structure, the mechanical property of the bubble light soil can be enhanced, the bubble light soil can better resist external loads and deformation, the overall stability and bearing capacity of a roadbed are effectively enhanced, and the requirement for road transformation is met. In addition, the seepage-proof geomembrane and the asphalt sealing layer are arranged, so that water seepage is effectively prevented, and the long-term stability and the service life of the roadbed are further guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of roadbed construction, in particular to a roadbed based on bubble lightweight soil. Background Art

[0002] The roadbed is the bearing layer of the road surface, which can withstand the pressure and vibration generated by vehicle loads and transfer them to the foundation and the ground. It is the basis for ensuring the normal use of the road and traffic safety. The fill soil used in the roadbed of roads that take a long time to build is of complex sources and different properties. It often has a large bulk density (that is, the soil per unit volume has a large weight). When the roadbed is backfilled with this fill soil, the fill soil load is often increased, which produces greater base stress on the foundation, easily causing deformation and settlement of the foundation, resulting in large post-construction differential settlement between the new and old roadbeds, which in turn has an adverse effect on the safety of nearby buildings. At the same time, after long-term use, the support and bearing capacity of the fill soil may drop sharply, which may easily lead to problems such as roadbed collapse and deformation.

[0003] In the process of existing road reconstruction, in order to reduce the adverse impact on the safety of surrounding buildings, it is often necessary to replace the fill of the roadbed to improve the support and bearing capacity of the roadbed. Therefore, it is necessary to provide a roadbed made of fill with better support and bearing capacity, smaller bulk density, and no adverse impact on the safety of surrounding buildings, so as to reconstruct the roadbed of existing roads. Utility Model Content

[0004] Aiming at the technical problems in the prior art that the original backfill used during road reconstruction makes the roadbed bulky and the supporting force and bearing capacity reduced, which easily causes foundation settlement and deformation, and the settlement difference between the new and old foundations is large, threatening the safety of surrounding buildings, the utility model provides a roadbed based on bubble lightweight soil.

[0005] A roadbed based on bubble lightweight soil, comprising an original roadbed, a protective wall arranged on one side of the original roadbed and a filled roadbed arranged between the original roadbed and the protective wall, wherein the joint surface of the original roadbed and the filled roadbed forms a plurality of steps, and the filled roadbed comprises a plurality of bubble lightweight soil layers sequentially filled along a filling direction; the bubble lightweight soil layers are arranged one-to-one in correspondence with the steps, and the horizontal planes of the bubble lightweight soil layers are flush with the horizontal planes of the corresponding steps; a plurality of reinforcing structures are sequentially arranged in the filled roadbed along the filling direction, and the reinforcing structures are respectively located in the gaps between any adjacent bubble lightweight soil layers; an impermeable geomembrane is arranged on the surface of the filled roadbed, and an asphalt sealing layer is arranged on the surface of the impermeable geomembrane; the top surfaces of the original roadbed and the asphalt sealing layer are sequentially provided with a crushed stone base layer and an asphalt concrete layer in a direction away from the ground.

[0006] Furthermore, the protective wall includes a panel, a plurality of pillars, and a concrete layer and a first crushed stone cushion layer arranged in sequence below the ground in a direction away from the filled roadbed; the bottom of the panel is fixed to the concrete layer; the pillar is located on the side of the panel close to the filled roadbed and is fixedly connected to the panel through a fixing rod; and the pillar passes through the concrete layer and the first crushed stone cushion layer and is fixed to the ground below the first crushed stone cushion layer.

[0007] Furthermore, the panel is provided with a plurality of pairs of embedded rings, and a connecting steel bar is fixedly arranged between each pair of embedded rings, and the fixing rod is fixedly arranged on the connecting steel bar.

[0008] Furthermore, the fixing rod comprises a first fixing rod and a second fixing rod, one end of the first fixing rod and the second fixing rod are fixed to the same pillar, and the other ends are respectively connected to different connecting steel bars.

[0009] Furthermore, the pillar is any one of angle steel or channel steel.

[0010] Furthermore, the bubble lightweight soil layer is laterally spaced with a plurality of first settlement joints; the panel is laterally spaced with a plurality of second settlement joints; the first settlement joints and the second settlement joints are both filled with asphalt wood boards or plywood, and the position of the first settlement joint is arranged in one-to-one correspondence with the position of the second settlement joint.

[0011] Furthermore, the asphalt concrete layer includes an 8 cm medium-grained asphalt concrete surface layer and a 4 cm fine-grained asphalt concrete surface layer which are sequentially arranged away from the ground.

[0012] Furthermore, the reinforced structure is composed of several layers of steel mesh, and the steel mesh includes several steel mesh sheets fixedly arranged on the surface of the bubble lightweight soil layer in sequence, and the adjacent steel mesh sheets are staggered and overlapped.

[0013] Furthermore, the reinforcement structure is composed of several layers of geogrids, the geogrids are fixed to the bubble lightweight soil layer by a plurality of U-shaped nails, and one end of the geogrid away from the protective wall is fixed to the original roadbed by an anchor rod.

[0014] Furthermore, a filter geotextile and a second crushed stone cushion layer are sequentially arranged at the bottom of the filled roadbed.

[0015] The beneficial effects of the utility model are as follows: the utility model provides a roadbed based on bubble lightweight soil, including an original roadbed, a protective wall arranged on one side of the original roadbed, and a filled roadbed arranged between the original roadbed and the protective wall; by using the relatively light bubble lightweight soil as fill to build the roadbed, the purpose of reducing the fill load or not increasing the fill load can be achieved, the bearing pressure of the foundation is effectively reduced, and the occurrence of a large difference in settlement between the new and old roadbeds caused by post-construction settlement is reduced, thereby avoiding adverse effects on the safety of surrounding buildings. At the same time, through the setting of the reinforced structure, the mechanical properties of the bubble lightweight soil can be enhanced, so that it can better resist external loads and deformation, effectively enhance the overall stability and bearing capacity of the roadbed, and meet the needs of road reconstruction. In addition, by setting an anti-seepage geomembrane and an asphalt sealing layer, moisture penetration is effectively prevented, thereby ensuring the long-term stability and service life of the roadbed. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of the structure of a roadbed based on bubble lightweight soil provided by the utility model;

[0017] Figure 2 A front view structural diagram of the connection between the panel and the support provided by the utility model;

[0018] Figure 3 This is a schematic diagram of the top view of the connection structure between the panel and the pillar provided by the utility model.

[0019] Figure ID

[0020] 1. Original roadbed; 2. Protective wall; 21. Panel; 211. Embedded ring; 212. Connecting steel bars; 22. Pillar; 23. Concrete layer; 24. First gravel cushion layer; 25. Fixing rod; 251. First fixing rod; 252. Second fixing rod; 3. Filling roadbed; 4. Steps; 5. Bubble lightweight soil layer; 6. Reinforced structure; 7. Anti-seepage geomembrane; 8. Asphalt sealing layer; 9. Gravel base layer; 10. Asphalt concrete layer; 11. Anti-filtration geotextile; 12. Second gravel cushion layer. DETAILED DESCRIPTION

[0021] In order to enable those skilled in the art to better understand the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings. The described embodiments are only a part of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention.

[0022] Example 1

[0023] refer to Figure 1As shown, a roadbed based on bubble lightweight soil includes an original roadbed 1, a protection wall 2 arranged on one side of the original roadbed 1, and a filling roadbed 3 arranged between the original roadbed 1 and the protection wall 2.

[0024] Specifically, the joint surface of the original roadbed 1 and the filled roadbed 3 forms a plurality of steps 4. The filled roadbed 3 includes a plurality of bubble lightweight soil layers 5 sequentially filled along the filling direction. The bubble lightweight soil layers 5 are arranged one-to-one corresponding to the steps 3, and the horizontal plane of the bubble lightweight soil layer 5 is flush with the horizontal plane of the corresponding step 3. A plurality of reinforcing structures 6 are sequentially arranged in the filled roadbed 3 along the filling direction, and the reinforcing structures 6 are respectively located in the gaps between any adjacent bubble lightweight soil layers 5. In this embodiment, the reinforcing structure 6 is fixed on the bubble lightweight soil layer 5 located below the reinforcing structure 6, and extends horizontally to the horizontal plane of the step 4 corresponding to the bubble lightweight soil layer 5 located below the reinforcing structure 6.

[0025] The step 4 structural setting can disperse the contact pressure between the original roadbed 1 and the filled roadbed 3, improve the stability of the joint surface, and reduce the roadbed deformation and cracking problems caused by uneven soil compaction or foundation settlement. Using the relatively light bubble lightweight soil layer 5 as fill to build the roadbed can achieve the purpose of reducing the fill load or not increasing the fill load, effectively reducing the bearing pressure of the foundation, reducing the deformation and settlement of the foundation, and protecting the safety of buildings near the foundation; at the same time, it can reduce the occurrence of large differences in settlement between the new and old roadbeds caused by post-construction settlement, and reduce problems such as road cracking and roadbed deformation caused by settlement differences, thereby avoiding adverse effects on the safety of surrounding buildings. At the same time, through the setting of the reinforcement structure 6, the mechanical properties of the bubble lightweight soil layer 5 can be enhanced, so that it can better resist external loads and deformation, thereby effectively enhancing the overall stability and bearing capacity of the roadbed, and meeting the needs of road and renovation.

[0026] Among them, in this embodiment, 3cmC20 concrete is provided on the edge of the step 4 to increase the strength and bearing capacity of the joint surface. A plurality of interconnected drainage pipes (not shown in the figure) connected to an external drainage ditch are fixedly provided on the joint surface of the original roadbed 1 and the filled roadbed 3. The arrangement of the drainage pipes can enhance the drainage capacity of the roadbed, ensure that water can be discharged quickly and effectively, prevent water from accumulating inside the roadbed, and thus reduce the damage to the roadbed caused by water damage.

[0027] The reinforcement structure 6 is composed of several layers of steel mesh, and the steel mesh includes several steel mesh sheets fixedly arranged on the surface of the bubble lightweight soil layer 5 in sequence, and the adjacent steel mesh sheets are staggered and overlapped. In this embodiment, the number of the reinforcement structures 6 is consistent with the number of layers of the steps 4; the reinforcement structure 6 includes 4 layers of steel mesh, and the thickness of the steel mesh is 4.5 mm. Through the arrangement of the steel mesh, the stability of the bubble lightweight soil layer 5 can be effectively strengthened and the bearing capacity of the bubble lightweight soil layer 5 can be improved.

[0028] Preferably, the reinforcement structure 6 is provided at the bottom and the top of the filling roadbed 3. By relatively concentrating stress at the bottom, the top and the horizontal plane where the step 4 is located of the filling roadbed 3, the stability and bearing capacity of the entire filling roadbed 3 can be improved.

[0029] The surface of the filling roadbed 3 is provided with an impermeable geomembrane 7, and the surface of the impermeable geomembrane 7 is provided with an asphalt sealing layer 8; the top surfaces of the original roadbed 1 and the asphalt sealing layer 8 are provided with a crushed stone base layer 9 and an asphalt concrete layer 10 in sequence. The bottom of the filling roadbed is provided with an anti-filter geotextile 11 and a second crushed stone cushion layer 12 in sequence along the direction close to the ground. The impermeable geomembrane 7 can effectively prevent moisture from penetrating into the interior of the roadbed, maintain the stability and dryness of the roadbed, effectively prevent moisture penetration, and thus ensure the long-term stability and service life of the roadbed. The asphalt sealing layer 8 can effectively block moisture from penetrating from the crushed stone base layer 9 into the bubble lightweight soil layer 5, further enhancing the anti-seepage performance of the roadbed. The anti-filter geotextile 11 can effectively isolate the moisture of the ground soil and the filling roadbed 3, prevent moisture mixing and penetration, and achieve a good waterproof and drainage design.

[0030] The crushed stone base layer 9 includes a 15 cm graded crushed stone cushion layer, a 20 cm 4% cement stabilized graded crushed stone sub-base layer, and a 20 cm 5% cement stabilized graded crushed stone base layer, which are sequentially arranged away from the ground. Among them, the 15 cm graded crushed stone cushion layer is mainly selected for wet road sections. The crushed stone base layer 9 has good water permeability and hydrophobicity, and can effectively guide the moisture that penetrates the asphalt concrete layer 10 to an external drainage ditch to achieve rapid drainage. The asphalt concrete layer includes an 8 cm medium-grained asphalt concrete surface layer and a 4 cm fine-grained asphalt concrete surface layer, which are sequentially arranged away from the ground. In this embodiment, the surfaces of the crushed stone base layer 9 and the asphalt concrete layer 10 are both sloped, and the slope of the slope decreases in the direction away from the original roadbed 1.

[0031] refer to Figure 2 , Figure 3 As shown, the protection wall 2 is used to enhance the stability of the edge of the filled roadbed 3 and prevent the roadbed from collapsing and deforming.

[0032] The protective wall 2 includes a panel 21, a plurality of pillars 22, and a concrete layer 23 and a first crushed stone cushion layer 24 arranged sequentially below the ground in a direction away from the filled roadbed 3; the bottom of the panel 21 is fixed to the concrete layer 23; the pillars 22 are located on the side of the panel 21 close to the filled roadbed 3, and are fixedly connected to the panel 21 through a fixing rod 25; and the pillars 22 pass through the concrete layer 23 and the first crushed stone cushion layer 24 and are fixed to the ground below the first crushed stone cushion layer 2.

[0033] The panel 21 is provided with a plurality of pairs of embedded rings 211, and a connecting steel bar 212 is fixedly arranged between each pair of embedded rings 211, and the fixing rod 25 is fixedly arranged on the connecting steel bar 212. Preferably, the fixing rod 25 includes a first fixing rod 251 and a second fixing rod 252, one end of the first fixing rod 251 and the second fixing rod 252 are fixed on the same pillar 22, and the other ends are respectively connected to different connecting steel bars 212.

[0034] Through the design of the first fixing rod 251 and the second fixing rod 252, the panel 21 can be provided with additional support by connecting the steel bars 212, thereby enhancing the anti-deformation ability of the panel 21 and ensuring the stability of the structure. In this embodiment, the support 22 is any one of angle steel or channel steel; the first fixing rod 251 and the second fixing rod 252 are arranged at an angle of 90 degrees.

[0035] The bubble lightweight soil layer 5 is provided with a plurality of first settlement joints at intervals in the horizontal direction; the panel 21 is provided with a plurality of second settlement joints at intervals in the horizontal direction; the first settlement joints and the second settlement joints are both filled with asphalt wood boards or plywood, and the position of the first settlement joint corresponds to the position of the second settlement joint. The bubble lightweight soil layer 5 and the panel 21 are filled in sections by area, and settlement joints are provided on the joint surfaces between each area. The provision of settlement joints can more effectively release the stress caused by foundation deformation, thereby improving the stability of the overall structure. Asphalt wood boards or plywood, as filling materials for settlement joints, have good waterproof and sealing properties.

[0036] Example 2

[0037] The difference between Example 2 and Example 1 is that the reinforced structure 6 is composed of several layers of geogrids, the geogrids are fixed to the bubble lightweight soil layer by several U-shaped nails, and the end of the geogrid away from the protective wall is fixed to the original roadbed 1 by anchor rods.

[0038] The geogrid is made of unidirectional one-time stretched polypropylene plastic geogrid. The yield elongation of the geogrid is not more than 10%, the longitudinal tension at 2% elongation is not less than 94kN / ; the longitudinal tension at 5% elongation is not less than 185kN / m. The U-shaped nails are made of 6mm steel bars, arranged in a square, with a spacing of 2mx2m; the length of the anchor rod is 16mm.

[0039] The utility model uses a relatively light bubble lightweight soil layer 5 as a fill layer to construct a roadbed, which effectively reduces the bearing pressure of the foundation, effectively reduces the post-construction settlement, and does not cause adverse effects on the safety of surrounding buildings. At the same time, through the setting of the reinforcement structure 6, the overall stability and bearing capacity of the roadbed are effectively enhanced; it is suitable for the reconstruction of old foundations and the construction of new foundations.

[0040] The preferred embodiments of the utility model disclosed above are only used to help explain the utility model, and do not limit the utility model to the specific implementation methods described. Obviously, other modifications and changes can be made according to the content of this specification. The embodiments selected and specifically described in this specification are to better explain the principles and practical applications of the utility model, so that technicians in the relevant technical field can understand and use the utility model well. It is not a limitation of the utility model. Any solution after simple deformation of the utility model belongs to the protection scope of the utility model.

Claims

1. A roadbed based on bubble lightweight soil, comprising an original roadbed, a protective wall arranged on one side of the original roadbed, and a filling roadbed arranged between the original roadbed and the protective wall, characterized in that: The joint surface of the original roadbed and the filled roadbed forms several steps, and the filled roadbed includes several bubble lightweight soil layers filled in sequence along the filling direction; the bubble lightweight soil layers are arranged in one-to-one correspondence with the steps, and the horizontal plane of the bubble lightweight soil layer is flush with the horizontal plane of the corresponding step; several reinforcement structures are arranged in sequence in the filled roadbed along the filling direction, and the reinforcement structures are respectively located in the gaps between any adjacent bubble lightweight soil layers; an impermeable geomembrane is arranged on the surface of the filled roadbed, and an asphalt sealing layer is arranged on the surface of the impermeable geomembrane; the top surfaces of the original roadbed and the asphalt sealing layer are successively provided with a crushed stone base layer and an asphalt concrete layer in the direction away from the ground.

2. The roadbed based on bubble lightweight soil according to claim 1, characterized in that: The protective wall includes a panel, a plurality of pillars, and a concrete layer and a first crushed stone cushion layer arranged in sequence below the ground in a direction away from the filled roadbed; the bottom of the panel is fixed to the concrete layer; the pillars are located on the side of the panel close to the filled roadbed and are fixedly connected to the panel through a fixing rod; and the pillars pass through the concrete layer and the first crushed stone cushion layer and are fixed to the ground below the first crushed stone cushion layer.

3. The roadbed based on bubble lightweight soil according to claim 2 is characterized in that: The panel is provided with a plurality of pairs of embedded rings, and a connecting steel bar is fixedly arranged between each pair of embedded rings, and the fixing rod is fixedly arranged on the connecting steel bar.

4. The roadbed based on bubble lightweight soil according to claim 2, characterized in that: The fixing rod comprises a first fixing rod and a second fixing rod, wherein one end of the first fixing rod and the second fixing rod are fixed to the same pillar, and the other ends are respectively connected to different connecting steel bars.

5. The roadbed based on bubble lightweight soil according to claim 2, characterized in that: The support column is any one of angle steel and channel steel.

6. The roadbed based on bubble lightweight soil according to claim 2, characterized in that: The bubble lightweight soil layer is laterally spaced with a plurality of first settlement joints; the panel is laterally spaced with a plurality of second settlement joints; the first settlement joints and the second settlement joints are both filled with asphalt wood boards or plywood, and the positions of the first settlement joints correspond one to one with the positions of the second settlement joints.

7. The roadbed based on bubble lightweight soil according to claim 1, characterized in that: The asphalt concrete layer comprises an 8 cm medium-grained asphalt concrete surface layer and a 4 cm fine-grained asphalt concrete surface layer which are sequentially arranged away from the ground.

8. The roadbed based on bubble lightweight soil according to claim 1, characterized in that: The reinforced structure is composed of several layers of steel mesh, which includes several steel mesh sheets fixedly arranged on the surface of the bubble lightweight soil layer in sequence, and the adjacent steel mesh sheets are staggered and overlapped.

9. The roadbed based on bubble lightweight soil according to claim 1, characterized in that: The reinforcement structure is composed of several layers of geogrids, the geogrids are fixed to the bubble lightweight soil layer through several U-shaped nails, and one end of the geogrid away from the protective wall is fixed to the original roadbed through an anchor rod.

10. The roadbed based on bubble lightweight soil according to claim 1, characterized in that: A filter geotextile and a second crushed stone cushion layer are sequentially arranged at the bottom of the filled roadbed along a direction close to the ground.

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