Fabricated light road roadbed structure and construction method thereof

Abstract

The invention discloses a fabricated light road subgrade structure and a construction method thereof. The fabricated light road subgrade structure comprises a foundation, and a leveling layer is laid on the foundation; the leveling layer is connected with an assembly base block type roadbed in a grouting layer bonding mode, left and right base blocks and upper and lower adjacent base blocks of the assembly base block type roadbed are connected through staggered-joint concave-convex mortise and tenon joints, and a steel-plastic geogrid or a steel wire mesh is laid between the upper base block and the lower base block of the assembly base block type roadbed. Cement paste or self-leveling grouting materials are poured into gaps between the upper base blocks and the lower base blocks of the assembly base block type road subgrade and gaps between the base blocks on the same layer, and an impermeable layer is laid on the top of the assembly base block type road subgrade. The roadbed structure arranged in the technology is a vertical roadbed structure, the problem that the occupied area is large due to traditional soil filling roadbed sloping can be greatly reduced, the foundation block assembly level is high, the material is excellent in light weight, high in strength and good in integrity, and the vertical roadbed structure has the advantages of being small in occupied area and high in construction speed when applied to the field of road reconstruction and extension.

Description

Technical Field

[0001] The present invention relates to the technical field of road subgrade structures, and in particular to an assembled lightweight road subgrade structure and a construction method thereof. Background Art

[0002] The roadbed is the main structure of the road that bears the load. Foamed lightweight soil is a lightweight building material, which is a mixture of cement slurry made of cement and water and a group of bubbles formed by physical foaming. After a series of physical and chemical reactions, it forms a material with a large number of closed pores. It has the characteristics of adjustable strength and density and can stand on its own after hardening. Due to its good lightness and excellent mechanical properties, foamed lightweight soil is currently widely used in the field of roadbeds.

[0003] The existing foam lightweight soil roadbed is mainly constructed by cast-in-place method, which requires the construction of each pouring layer with a thickness of 0.5m-1.0m, and the next layer can only be poured after the previous pouring layer has a certain bearing capacity, which usually requires more than 8 hours of waiting. Therefore, the current foam lightweight soil roadbed using cast-in-place method has problems such as small single pouring layer thickness, long time interval between pouring of upper and lower adjacent layers, and slow overall roadbed construction progress. Compared with traditional roadbeds, prefabricated roadbeds have the characteristics of modular design and prefabricated construction, which can improve construction efficiency and save costs; if foam lightweight soil is designed as a prefabricated lightweight roadbed structure, it will be a new road foundation structure. Some prefabricated roadbed structures are also reported in public literature, for example, Chinese patent: A fast-assembly block-type railway roadbed structure and its construction method, application number: 202410471097.8, application date: 2024.04.18, abstract: A fast-assembly block-type railway roadbed structure, including an assembled block-type railway roadbed laid on top of a foundation, and a waterproof layer is arranged on top of the assembled block-type railway roadbed; the waterproof layer is cast by asphalt concrete, and the assembled block-type railway roadbed is composed of blocks, and the structural form of the blocks is a rectangular configuration or a cube configuration, and the blocks are prefabricated from foam lightweight soil materials; the assembled block-type railway roadbed adopts a single-point mortise and tenon connection method, that is, the blocks are connected to adjacent blocks by concave-convex fittings as a whole. The present invention can effectively improve on-site construction efficiency; effectively solve the problem that a large amount of land is occupied due to the slope reduction demand of conventional roadbeds; and can effectively control the roadbed settlement when replacing soft soil foundations and widening the roadbed of new lines connected to existing high-speed railway stations, thereby improving the stability, smoothness and reliability of the track structure and ensuring the smoothness and comfort of train operation.

[0004] Through applied research, it is found that the above-mentioned fast-assembly block-type railway roadbed structure is divided into top-layer blocks, middle-layer blocks and bottom-layer blocks. Due to the limitation of the middle-layer block structure, when the roadbed is of different heights, it is impossible to increase the roadbed height by adding block layers, and the size of the module can only be changed, which involves the re-making of the block mold; in addition, this technology is combined by mortise and tenon connections between blocks, and there are inevitably gaps between blocks, so the blocks may be displaced under load, which leads to poor integrity of the roadbed. In addition, the existing assembled roadbed structure has high requirements for construction technology when splicing mortise and tenon joints. If there is a slight misalignment, it cannot be spliced. Therefore, it is necessary to design an assembled lightweight roadbed technology suitable for foam lightweight soil. Summary of the invention

[0005] The purpose of the present invention is to provide an assembled lightweight roadbed structure and a construction method thereof in view of the problems existing in the prior art. The roadbed structure arranged by this technology is an upright roadbed structure, which can greatly reduce the problem of large floor space caused by the slope of the traditional fill roadbed, and the base block has a high level of assembly, the material is lightweight, has high strength and good integrity, and when applied to the field of road reconstruction and expansion, it has the advantages of small footprint and fast construction speed.

[0006] The present invention is achieved by adopting the following technical solutions: A prefabricated lightweight road subgrade structure comprises a foundation, wherein a leveling layer is laid on the foundation, the leveling layer adopts cast-in-place foam lightweight soil, plays the role of leveling the foundation, improving the integrity of the foundation, and reducing uneven settlement of the subgrade; an assembled block-type road subgrade is connected to the leveling layer by a grouting layer bonding method, the left and right and upper and lower adjacent blocks of the assembled block-type road subgrade are connected by staggered concave-convex mortise and tenon joints, a steel-plastic geogrid or a steel wire mesh is laid between the upper and lower blocks of the assembled block-type road subgrade, cement slurry or other grouting materials are poured in the gaps between the upper and lower blocks of the assembled block-type road subgrade and between blocks on the same layer, so that the assembled road subgrade has excellent integrity, and an anti-seepage layer is laid on the top of the assembled block-type road subgrade, the material of the anti-seepage layer is HDPE anti-seepage material, which plays the role of waterproofing the subgrade.

[0007] Further preferred: the assembled block-type road subgrade includes a left short block, a left long block, a middle short block, a middle long block, a right short block and a right long block assembled with staggered concave-convex mortise and tenon joints; one side of the left short block and the left long block is set as a left block plane, and the other side is provided with a left block transverse mortise and tenon for transverse connection; the upper and lower ends of the left short block and the left long block are respectively provided with a left block vertical concave-convex mortise and tenon mechanism for vertical connection, and the front and rear ends of the left short block and the left long block are respectively provided with a left block longitudinal concave-convex mortise and tenon mechanism for longitudinal connection; one side of the middle short block and the middle long block is provided with an middle block for cooperating with the left block transverse mortise and tenon Tenon convex, the other side is correspondingly provided with the middle base block mortise and tenon concave for horizontal splicing; the upper and lower ends of the middle short base block and the middle long base block are respectively provided with the middle base block vertical concave-convex mortise and tenon mechanism for vertical connection, and the front and rear ends of the middle short base block and the middle long base block are respectively provided with the middle base block longitudinal concave-convex mortise and tenon mechanism for longitudinal connection; one side of the right short base block and the right long base block is set as the right base block plane, and the other side is provided with the right base block tenon convex for matching with the middle base block mortise and tenon concave; the upper and lower ends of the right short base block and the right long base block are respectively provided with the right base block vertical concave-convex mortise and tenon mechanism for vertical connection, and the front and rear ends of the right short base block and the right long base block are respectively provided with the right base block longitudinal concave-convex mortise and tenon mechanism for longitudinal connection. The left base block vertical concave-convex mortise and tenon mechanism, the middle base block vertical concave-convex mortise and tenon mechanism and the right base block vertical concave-convex mortise and tenon mechanism adopt a trapezoidal cross-section mortise and tenon structure, which has the advantage of easy splicing and avoids the problem that slight misalignment may cause inability to splice.

[0008] Further preferred: a plurality of raised blocks are arranged on the fitting surface of the vertical concave-convex mortise and tenon mechanism of the left base block at the upper end or the lower end of the left short base block and the left long base block; a plurality of raised blocks are also arranged on the mortise-convex fitting surface of the longitudinal concave-convex mortise and tenon mechanism of the left base block at the front end or the rear end of the left short base block and the left long base block.

[0009] Further preferred: a plurality of raised blocks are arranged on the mating surface of the tenon and convex of the intermediate base block of the intermediate short base block and the intermediate long base block; a plurality of raised blocks are arranged on the mating surface of the vertical concave and convex mortise and tenon mechanism of the intermediate base block at the upper end or the lower end of the intermediate short base block and the intermediate long base block; a plurality of raised blocks are also arranged on the mating surface of the longitudinal concave and convex mortise and tenon mechanism of the intermediate base block at the front end or the rear end of the intermediate short base block and the intermediate long base block.

[0010] Further preferred: a plurality of raised blocks are arranged on the mating surface of the tenon and convex of the right side base block of the right side short base block and the right side long base block, a plurality of raised blocks are arranged on the mating surface of the vertical concave and convex mortise and tenon mechanism of the right side base block at the upper section or lower end of the right side short base block and the right side long base block; a plurality of raised blocks are also arranged on the mating surface of the longitudinal concave and convex mortise and tenon mechanism of the right side base block at the front end or rear end of the right side short base block and the right side long base block.

[0011] The construction steps of the assembled lightweight road subgrade are as follows: Step 1: Test the bearing capacity of the foundation to ensure that the bearing capacity of the foundation meets the design requirements.

[0012] Step 2: Build a leveling layer of cast-in-place foam lightweight soil formwork 10cm-20cm outward from the lightweight soil roadbed. The building height is determined according to the height of the protrusion within the roadbed, and then pour the leveling layer.

[0013] Step 3: While the leveling layer is being constructed, the blocks for the assembled block-type roadbed should be cast and maintained in advance at the prefabricated component factory. Each block should be cast continuously and evenly. The mold can be removed after 24 hours, and the formed blocks can be taken out. They can be used for roadbed assembly after being cured for 7 days or until the strength reaches the design value.

[0014] Step 4: Spread cement slurry on the leveling layer and lay the base blocks. After the first layer of base blocks is laid, splice the next layer of base blocks. The next layer of base blocks is staggered and spliced ​​on the first layer of base blocks. Before splicing the next layer of base blocks, lay a layer of wire mesh or steel-plastic geogrid on the first layer of base blocks, and pour cement slurry or self-leveling grouting material to bond the upper and lower layers and adjacent modules, while improving the integrity.

[0015] Step 5: According to the height of the assembled block road subgrade, after the blocks are assembled, a layer of anti-seepage layer is laid on the top of the assembled block road subgrade.

[0016] The assembled lightweight roadbed structure and construction method of the present application are to solve the problems of small single pouring layer thickness of cast-in-place foam lightweight soil roadbed, long time interval between pouring of adjacent layers, slow overall roadbed construction progress, and connection seams between common assembled roadbed layers and blocks; compared with the prior art, the following beneficial effects are achieved: 1. The assembled block road subgrade is prefabricated in the factory and hoisted and spliced ​​on site. Compared with the traditional cast-in-place foam lightweight soil subgrade, it is not limited by the thickness of the pouring layer, and there is no problem of long construction interval of the traditional foam lightweight soil. It can effectively improve the construction speed of the lightweight soil embankment.

[0017] 2. The upper and lower blocks of the assembled block-type road subgrade are spliced ​​in the form of staggered joints, which has a locking effect. The vertical concave-convex mortise and tenon structure of the left block, the middle block and the right block adopt a mortise and tenon structure with a trapezoidal cross-section, which has the advantage of easy splicing and avoids the problem that the splicing may not be possible due to slight misalignment. The top surface and the lateral raised surface of the block are provided with raised blocks, so that there is a certain gap between adjacent blocks, and after the splicing is completed, cement slurry or self-leveling grouting material is injected to form a grouting layer, so that each block can be tightly bonded, ultimately ensuring that the assembled lightweight subgrade has excellent integrity and can prevent the subgrade overturning problem that may be caused by vertical splicing.

[0018] 3. The assembled block roadbed adopted is a vertical roadbed structure, which can greatly reduce the problem of large floor space caused by the slope of traditional fill roadbed. The block has a high level of assembly, the material is lightweight, the strength is high, and the integrity is good. When used in the field of road reconstruction and expansion, it has the advantages of small footprint and fast construction speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of laying the leveling layer for the foundation; Figure 2 A schematic diagram of a three-dimensional structure for laying prefabricated foundation blocks; Figure 3 A schematic diagram of the plan structure for the laying of prefabricated foundation blocks; Figure 4 for Figure 3 Schematic diagram of the left side; Figure 5 It is a structural schematic diagram of the short base block on the left; Figure 6 It is a schematic diagram of the structure of the middle short base block; Figure 7 The schematic diagram of the structure of the short base block on the right Figure 8 The structural diagram of the long base block on the left Fig. 9 Schematic diagram of the structure of the middle long base block Fig.10 The schematic diagram of the structure of the long base block on the right Fig.11 It is a schematic diagram of the arrangement structure of the protruding blocks on the base block; The names of the parts corresponding to the serial numbers in the figure are: 1. Foundation, 2. Leveling layer, 3. Assembled block type roadbed, 4. Short block on the left, 5. Plane of the left block, 6. Vertical concave-convex mortise and tenon structure of the left block, 7. Raised block, 8. Transverse mortise and concave of the left block, 9. Longitudinal concave-convex mortise and tenon structure of the left block, 10. Longitudinal concave-convex mortise and tenon structure of the middle block, 11. Short block on the middle, 12. Tenon and convex of the middle block, 13. Vertical concave-convex mortise and tenon structure of the middle block, 14. Mortise and concave of the middle block, 15. Short block on the right, 16. Plane of the right block, 17. Vertical concave-convex mortise and tenon structure of the right block, 18. Tenon and convex of the right block, 19. Longitudinal concave-convex mortise and tenon structure of the right block. DETAILED DESCRIPTION

[0020] The technical solutions in the invention are clearly and completely described below in conjunction with the embodiments. The described embodiments are only a part of the present invention, rather than all the embodiments. Example

[0021] A prefabricated lightweight road subgrade structure comprises a foundation 1, on which a leveling layer 2 is laid, the leveling layer 2 is made of cast-in-place foam lightweight soil, and plays the role of leveling the foundation, improving the integrity of the foundation, and reducing uneven settlement of the subgrade; an assembled block-type road subgrade 3 is connected to the leveling layer 2 by a grouting layer bonding method, the assembled block-type road subgrade 3 is formed by connecting the blocks with staggered concave-convex mortise and tenon joints through the grouting layer, the left and right and upper and lower adjacent blocks of the assembled block-type road subgrade 3 are connected by staggered concave-convex mortise and tenon joints, a steel-plastic geogrid or a steel wire mesh is laid between the upper and lower blocks of the assembled block-type road subgrade 3, cement slurry or self-leveling grouting material is poured in the gaps between the upper and lower blocks of the assembled block-type road subgrade 3 and between the blocks of the same layer, so that the assembled subgrade has excellent integrity, and an anti-seepage layer is laid on the top of the assembled block-type road subgrade 3, the material of the anti-seepage layer is HDPE anti-seepage material, which plays the role of waterproofing the subgrade.

[0022] The assembled block-type road subgrade 3 comprises a left short block 4, a left long block, a middle short block 11, a middle long block, a right short block 15 and a right long block assembled with staggered concave-convex mortise and tenon joints; one side of the left short block 4 and the left long block is set as a left block plane 5, and the other side is provided with a left block transverse mortise and tenon 8 for transverse connection; the upper and lower ends of the left short block 4 and the left long block are respectively provided with a left block vertical concave-convex mortise and tenon mechanism 6 for vertical connection, and the front and rear ends of the left short block 4 and the left long block are respectively provided with a left block longitudinal concave-convex mortise and tenon mechanism 9 for longitudinal connection; one side of the middle short block 11 and the middle long block is provided with an middle block tenon convex 12 for cooperating with the left block transverse mortise and tenon 8, and the other side is provided with a left block transverse mortise and tenon convex 12 for cooperating with the left block transverse mortise and tenon convex 12 ... An intermediate base block mortise and tenon 14 for horizontal widening should be provided; the upper and lower ends of the intermediate short base block 11 and the intermediate long base block are respectively provided with intermediate base block vertical concave-convex mortise and tenon mechanisms 13 for vertical connection, and the front and rear ends of the intermediate short base block 11 and the intermediate long base block are respectively provided with intermediate base block longitudinal concave-convex mortise and tenon mechanisms 10 for longitudinal connection; one side of the right short base block 15 and the right long base block is provided with a right base block plane 16, and the other side is provided with a right base block tenon 18 for cooperating with the intermediate base block mortise and tenon 14; the upper and lower ends of the right short base block 15 and the right long base block are respectively provided with right base block vertical concave-convex mortise and tenon mechanisms 17 for vertical connection, and the front and rear ends of the right short base block 15 and the right long base block are respectively provided with right base block longitudinal concave-convex mortise and tenon mechanisms 19 for longitudinal connection.

[0023] like Figure 5-11 As shown, the vertical concave-convex mortise and tenon mechanism 6 of the left base block, the vertical concave-convex mortise and tenon mechanism 13 of the middle base block and the vertical concave-convex mortise and tenon mechanism 17 of the right base block adopt a mortise and tenon structure with a trapezoidal cross-section, which has the advantage of being easy to splice and avoids the problem of being unable to splice due to slight misalignment.

[0024] A plurality of protruding blocks 7 are arranged on the fitting surface of the vertical concave-convex mortise and tenon mechanism 6 of the left base block at the upper end or the lower end of the left short base block 4 and the left long base block; a plurality of protruding blocks 7 are also arranged on the mortise-convex fitting surface of the longitudinal concave-convex mortise and tenon mechanism 9 of the left base block at the front end or the rear end of the left short base block 4 and the left long base block.

[0025] A plurality of protruding blocks 7 are arranged on the mating surfaces of the intermediate base block tenons and convexities 12 of the intermediate short base block 11 and the intermediate long base block; a plurality of protruding blocks 7 are arranged on the mating surfaces of the intermediate base block vertical concave-convex mortise and tenon mechanisms 13 at the upper or lower ends of the intermediate short base block 11 and the intermediate long base block; a plurality of protruding blocks 7 are also arranged on the mating surfaces of the intermediate base block longitudinal concave-convex mortise and tenon mechanisms 10 at the front or rear ends of the intermediate short base block 11 and the intermediate long base block.

[0026] A plurality of raised blocks 7 are arranged on the fitting surfaces of the right side base block tenons and convexities 18 of the right side short base block 15 and the right side long base block, and a plurality of raised blocks 7 are arranged on the fitting surfaces of the right side base block vertical concave-convex mortise and tenon mechanisms 17 at the upper section or lower end of the right side short base block 15 and the right side long base block; a plurality of raised blocks 7 are also arranged on the fitting surfaces of the right side base block longitudinal concave-convex mortise and tenon mechanisms 19 at the front end or rear end of the right side short base block 15 and the right side long base block.

[0027] The construction steps of the assembled lightweight road subgrade are as follows: Step 1: Test the bearing capacity of the foundation to ensure that the bearing capacity of the foundation meets the design requirements.

[0028] Step 2: Build a leveling layer of cast-in-place foam lightweight soil formwork 10cm-20cm outward from the lightweight soil roadbed. The building height is determined according to the height of the protrusion within the roadbed, and then pour the leveling layer.

[0029] Step 3: While the leveling layer is being constructed, the blocks for the assembled block-type roadbed should be cast and maintained in advance at the prefabricated component factory. Each block should be cast continuously and evenly. The mold can be removed after 24 hours, and the formed blocks can be taken out. They can be used for roadbed assembly after being cured for 7 days or until the strength reaches the design value.

[0030] Step 4: Spread cement slurry on the leveling layer and lay the base blocks. After the first layer of base blocks is laid, splice the next layer of base blocks. The next layer of base blocks is staggered and spliced ​​on the first layer of base blocks. Before splicing the next layer of base blocks, lay a layer of wire mesh or steel-plastic geogrid on the first layer of base blocks, and pour cement slurry or self-leveling grouting material to bond the upper and lower layers and adjacent modules, while improving the integrity.

[0031] Step 5: According to the height of the assembled block road subgrade, after the blocks are assembled, a layer of anti-seepage layer is laid on the top of the assembled block road subgrade.

[0032] The above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Any changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention should fall within the protection scope of the present invention.

Claims

1. An assembled lightweight roadbed structure, comprising a foundation (1), characterized in that: The foundation (1) is paved with a leveling layer (2) for leveling the foundation and improving the integrity of the foundation. The leveling layer (2) is made of cast-in-place foam lightweight soil. The leveling layer (2) is connected to an assembled block roadbed (3) by means of a grouting layer bonding method. The left and right and upper and lower adjacent blocks of the assembled block roadbed (3) are connected by staggered concave-convex mortise and tenon joints. A steel-plastic geogrid or a steel wire mesh is paved between the upper and lower blocks of the assembled block roadbed (3). Cement slurry or self-leveling grouting material is poured into the gaps between the upper and lower blocks of the assembled block roadbed (3) and between blocks on the same layer. An anti-seepage layer is paved on the top of the assembled block roadbed (3).

2. The assembled lightweight roadbed structure according to claim 1 is characterized in that: The assembled block-type roadbed (3) comprises a left short block (4), a left long block, a middle short block (11), a middle long block, a right short block (15) and a right long block assembled by staggered concave-convex mortise and tenon joints; one side of the left short block (4) and the left long block is provided with a left block plane (5), and the other side is provided with a left block transverse mortise and tenon groove (8) for transverse connection; the upper and lower ends of the left short block (4) and the left long block are respectively provided with a left block vertical concave-convex mortise and tenon groove mechanism (6) for vertical connection, and the front and rear ends of the left short block (4) and the left long block are respectively provided with a left block longitudinal concave-convex mortise and tenon groove mechanism (9) for longitudinal connection; one side of the middle short block (11) and the middle long block is provided with a middle block mortise and tenon groove (12) for cooperating with the left block transverse mortise and tenon groove (8), and the other side is provided with a left block transverse mortise and tenon groove (8) for cooperating with the ... Correspondingly, intermediate base block mortises (14) for horizontal widening are provided; the upper and lower ends of the intermediate short base block (11) and the intermediate long base block are respectively provided with intermediate base block vertical concave-convex tenon and mortise mechanisms (13) for vertical connection; the front and rear ends of the intermediate short base block (11) and the intermediate long base block are respectively provided with intermediate base block longitudinal concave-convex tenon and mortise mechanisms (10) for longitudinal connection; one side of the right short base block (15) and the right long base block is provided with a right base block plane (16), and the other side is provided with a right base block tenon (18) for matching with the intermediate base block mortise (14); the upper and lower ends of the right short base block (15) and the right long base block are respectively provided with right base block vertical concave-convex tenon and mortise mechanisms (17) for vertical connection; the front and rear ends of the right short base block (15) and the right long base block are respectively provided with right base block longitudinal concave-convex tenon and mortise mechanisms (19) for longitudinal connection.

3. The assembled lightweight roadbed structure according to claim 2 is characterized in that: A plurality of protruding blocks (7) are provided on the mating surface of the left base block vertical concave-convex tenon and mortise-and-tenon mechanism (6) at the upper end or the lower end of the left short base block (4) and the left long base block; a plurality of protruding blocks (7) are also provided on the mortise-and-convex mating surface of the left base block longitudinal concave-convex tenon and mortise-and-tenon mechanism (9) at the front end or the rear end of the left short base block (4) and the left long base block.

4. The assembled lightweight roadbed structure according to claim 2 is characterized in that: A plurality of protruding blocks (7) are arranged on the mating surfaces of the intermediate base block tenons (12) of the intermediate short base block (11) and the intermediate long base block; a plurality of protruding blocks (7) are arranged on the mating surfaces of the intermediate base block vertical concave-convex tenon-mortise and tenon mechanisms (13) at the upper or lower ends of the intermediate short base block (11) and the intermediate long base block; and a plurality of protruding blocks (7) are also arranged on the mating surfaces of the intermediate base block longitudinal concave-convex tenon-mortise and tenon mechanisms (10) at the front or rear ends of the intermediate short base block (11) and the intermediate long base block.

5. The assembled lightweight roadbed structure according to claim 2 is characterized in that: A plurality of protruding blocks (7) are arranged on the mating surfaces of the right side base block tenons (18) of the right side short base block (15) and the right side long base block, a plurality of protruding blocks (7) are arranged on the mating surfaces of the right side base block vertical concave-convex tenon-mortise and tenon mechanism (17) at the upper section or the lower end of the right side short base block (15) and the right side long base block; a plurality of protruding blocks (7) are also arranged on the mating surfaces of the right side base block longitudinal concave-convex tenon-mortise and tenon mechanism (19) at the front end or the rear end of the right side short base block (15) and the right side long base block.

6. The assembled lightweight roadbed structure according to claim 1 is characterized in that: The construction steps of the assembled lightweight road subgrade are as follows: Step 1: Test the bearing capacity of the foundation to ensure that the bearing capacity of the foundation meets the design requirements; Step 2: Build a leveling layer of cast-in-place foam lightweight soil formwork 10cm-20cm outward from the lightweight soil roadbed. The building height is determined according to the height of the bulge within the roadbed range, and then pour the leveling layer; Step 3: While the leveling layer is being constructed, the foundation blocks of the assembled block-type roadbed are cast and maintained in advance at the prefabricated component factory. Each foundation block should be cast continuously and evenly. After 24 hours, the mold can be disassembled and the formed foundation blocks can be taken out. They can be used for roadbed assembly only after being cured for 7 days or the strength reaches the design value. Step 4: Spread cement slurry on the leveling layer and lay the foundation blocks. After the first layer of foundation blocks is laid, the next layer of foundation blocks is spliced. The next layer of foundation blocks is spliced ​​on the first layer of foundation blocks in an offset manner. Before splicing the next layer of foundation blocks, a layer of steel wire mesh or steel-plastic geogrid is laid on the first layer of foundation blocks, and cement slurry or self-leveling grouting material is poured to play the role of bonding the upper and lower layers and adjacent modules, while improving the integrity; Step 5: According to the height of the assembled block road subgrade, after the blocks are assembled, a layer of anti-seepage layer is laid on the top of the assembled block road subgrade.

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