Semi-cut and semi-fill ecological lightweight roadbed construction method

Abstract

This invention relates to a semi-cut / semi-fill ecological lightweight roadbed construction method without formwork removal. The method includes the following steps: excavation of steps and strip foundations, laying of waterproof geotextile, installation of ecological formwork without formwork removal, construction of prestressed anchor cables and water pipes, installation of partition slabs, construction of reinforcing mesh, pouring of foamed soil, tensioning of prestressed anchor cables, cyclic construction, construction of pavement structure layers, slope backfilling, and planting. The ecological formwork without formwork serves as the pouring template and provides space for subsequent planting, forming an ecological support system with good aesthetics. The back of the back slab has pre-reserved reinforcing bars that are bent to improve the integrity with the foamed soil. The ecological formwork without formwork is anchored using a prestressed anchor cable + reinforcing mesh structure, improving the stability of the excavation and fill interface and reducing uneven settlement. The water pipes drain moisture from the original soil, which is then filtered through a sand layer and stored in a gravel reservoir, reducing maintenance costs.

Description

Technical Field

[0001] This invention relates to the construction of semi-fill and semi-cut roadbeds, and more particularly to a semi-cut and semi-fill eco-friendly lightweight roadbed construction method that does not require formwork removal. Background Technology

[0002] In recent years, the construction of semi-fill / semi-cut roadbeds has frequently been encountered during the construction and renovation of mountain highways. Because one side of a semi-fill / semi-cut roadbed is the original roadbed, while the other side is formed by filling, the differences in the formation methods, physical and mechanical properties, groundwater, and internal structure of the roadbeds on both sides of the junction can lead to cracks, damage, elevation differences, and driving discomfort at the joint, affecting highway safety and reducing service levels. Measures such as excavation steps, geogrids, and reinforcement of the new roadbed foundation are often used to address the junction of cut and fill roadbeds. While these measures can reduce uneven settlement and deformation to some extent, the results are not ideal. Furthermore, rainwater can seep into the roadbed during rainy weather, damaging the old roadbed and exacerbating existing problems in severe cases.

[0003] Therefore, it is crucial to find a roadbed structure and construction method that is structurally stable, quick to construct, highly integrated, and combines prevention and drainage to effectively prevent water erosion of the roadbed. Using foamed lightweight soil for backfilling has the advantage of rapid construction, but it still has the following problems: 1. The use of wooden formwork or precast concrete retaining walls as pouring templates on the fill side results in insufficient connection between them and the poured concrete. Formwork supports are required during concrete pouring, and these supports need to be removed later, leading to low construction efficiency; 2. The use of wooden formwork or precast concrete retaining walls cannot provide ecological functions and cannot form an organic integration with the slope ecology, resulting in poor environmental effects; 3. Uneven settlement is prone to occur at the interface between excavation and fill; 4. The loss of pore water within the soil carries away soil particles, affecting the stability of the roadbed. Summary of the Invention

[0004] The purpose of this invention is to address the problems existing in the construction of semi-fill and semi-cut subgrades, and to propose a semi-cut and semi-fill ecological lightweight subgrade construction method that does not require formwork removal, using the following technical solution.

[0005] A semi-cut / semi-fill eco-friendly lightweight roadbed construction method without formwork removal, characterized by the following construction steps:

[0006] S1. Construction of excavated steps and strip foundations: The natural surface is cleared and treated, and the excavation section is excavated into steps; the fill section is excavated into strip foundation trenches, the bottom bedding layer is constructed, and concrete is poured to form strip foundations. The bottom drainage ditch is excavated on the outside of the strip foundation.

[0007] S2. Laying waterproof geotextile: Laying full-section waterproof geotextile in the fill section and excavation steps;

[0008] S3, Eco-friendly, non-removable formwork installation:

[0009] S3.1 Prefabricated eco-friendly non-removable formwork, the eco-friendly non-removable formwork consists of a front plate, a rear plate and a bottom plate. The bottom plate is provided with reserved bending ribs. The front plate and the rear plate are respectively provided with splicing protrusions and splicing grooves on both sides. A small piece is reserved in each of the splicing protrusions and splicing grooves in the rear plate. After splicing, a partition plate groove is formed. Water pipe holes and anchor cable holes are provided in the rear plate. The back of the rear plate is roughened to form a rough surface.

[0010] S3.2 When constructing the bottom layer of eco-friendly non-removable formwork, pour a layer of mortar into the groove at the top of the strip foundation, place the prefabricated eco-friendly non-removable formwork in the groove, with the front plate facing the slope side and the rear plate facing the backfill side, and the splicing protrusions of adjacent eco-friendly non-removable formworks interlock with the splicing groove.

[0011] S3.3 When constructing non-bottom layer ecological non-removable formwork, after the lower layer of foamed soil has reached a certain strength, install an ecological non-removable formwork on top of the foamed soil, with the front plate of the upper ecological non-removable formwork abutting the rear plate of the lower ecological non-removable formwork.

[0012] S4. Construction of prestressed anchor cables and water pipes:

[0013] S4.1 Drill water pipe holes and anchor cable holes at even intervals to the specified depth at the steps;

[0014] S4.2. Construct the water inlet pipe. The front end of the water inlet pipe is wrapped with filter geotextile and inserted into the water inlet pipe hole at the step. The solid pipe section is filled with small-diameter crushed stone and inserted into the water inlet pipe hole of the eco-friendly, non-removable formwork.

[0015] S4.3 Fill the gap between the water pipe and the water pipe hole at the step with crushed stone, and set a reverse filter end at the outer end of the water pipe hole of the ecological non-removable template;

[0016] S4.4 Insert the prestressed anchor cable into the anchor cable hole of the eco-friendly, non-removable formwork, and simultaneously insert it into the corresponding anchor cable hole on the step. Grout the end to form an anchor body. The prestressed anchor cable is initially anchored on the eco-friendly, non-removable formwork side using an anchor head.

[0017] S5. Install partition plates: Use partition plates to divide the pouring area of ​​this layer. Insert the partition plates into the partition plate grooves and fill the gaps on both sides with foam glue.

[0018] S6. Reinforcing mesh construction:

[0019] S6.1. Fabricate a reinforcing mesh, with an upwardly folded end at the connection point between the reinforcing mesh and the step;

[0020] S6.2 Lay the reinforcing mesh for this layer, overlap the straight sections with the pre-reserved bent bars of the eco-friendly non-removable formwork, and tie them together; make contact with the vertical direction of the step at the folded end, and fix it to the side of the step with U-shaped anchor nails;

[0021] S7. Pouring foamed soil:

[0022] S7.1. Prepare foamed soil and pour it in layers using the skip-pour method in the partitioned areas of this layer, pouring it up to the installation plane of the ecological non-removable formwork of the next layer.

[0023] S7.2 After the foamed soil reaches a certain strength, the partition board is removed, and foamed soil is poured in the adjacent partition area until it reaches the upper layer of the ecological non-removable formwork installation plane.

[0024] S8. Tensioning of prestressed anchor cables: After the foamed soil in this layer reaches a certain strength, the prestressed anchor cables are tensioned and anchored at the anchor head, and the anchor head is treated with anti-corrosion measures.

[0025] S9. Cyclic construction: Layered construction is carried out in the order of S3 to S9. First, the ecological non-removable formwork of this layer is installed. Then, the prestressed anchor cables and water pipes of this layer are constructed. Next, the partition slab and reinforcing mesh of this layer are installed. Finally, the foamed soil of this layer is poured until the top surface of the roadbed is reached.

[0026] S10. Construction of pavement structure layer: A structural waterproof layer is constructed on the top surface of the subgrade, and the pavement structure layer is constructed in sequence above the structural waterproof layer. Guardrails are installed on both sides of the pavement structure layer, and drainage ditches are constructed on the outside of the guardrails.

[0027] S11. Slope backfilling and planting: In the planting trough between the front and rear panels of the eco-friendly non-removable formwork, a gravel water storage layer, a filter sand layer and a planting soil layer are backfilled in sequence, and turf and landscape greenery are laid on the top surface of the planting soil layer.

[0028] Preferably, the top of the strip foundation is provided with a groove that matches the eco-friendly, non-removable formwork base plate.

[0029] Preferably, the partitioned plate groove is located on the outside of the eco-friendly, non-removable template splicing protrusion and splicing groove. After adjacent eco-friendly, non-removable template splicing protrusions and splicing grooves are spliced ​​together, the partitioned plate groove is formed.

[0030] Preferably, the overlap height between the upper eco-friendly non-removable formwork front panel and the lower eco-friendly non-removable formwork rear panel is not less than 10cm.

[0031] Preferably, the anchor cable holes and water pipe holes on the steps correspond one-to-one with the anchor cable holes and water pipe holes on the eco-friendly, non-removable formwork, wherein the backfill side of the anchor cable holes on the steps is inclined to the excavation side, and the backfill side of the water pipe holes is inclined to the excavation side.

[0032] Preferably, the thickness of the partition plate matches the partition plate groove.

[0033] Preferably, each eco-friendly, non-removable formwork panel is equipped with a prestressed anchor cable and a water pipe, and a layer of reinforcing mesh is provided on its bottom plate; the upper prestressed anchor cable and the bottom reinforcing mesh, combined with the strip foundation groove or the lower eco-friendly, non-removable formwork panel, form multiple fixation.

[0034] Preferably, the upper layer of eco-friendly, non-removable formwork and the lower layer of eco-friendly, non-removable formwork are staggered and spliced.

[0035] Preferably, the reverse filter end is buried in the planting soil layer, which facilitates the drainage of soil water through the water pipe into the ecological non-removable template planting trough, and after being filtered by the filter sand layer, it is stored in the gravel water storage layer for the irrigation of green plants.

[0036] The beneficial effects of this invention are:

[0037] 1. Eco-friendly, non-removable formwork serves as the pouring formwork and provides planting space for the future, forming an ecological support system with good landscape features; the planting trough can collect rainwater, regulate plant growth, and has good ecological properties; the back of the back panel has reserved reinforcement bars that are bent to improve the overall integrity with the lightweight soil.

[0038] 2. The eco-friendly formwork and excavation steps are anchored using a prestressed anchor cable + reinforced mesh structure, which further improves the stability of the excavation and backfill interface and reduces uneven settlement; and the rough surface on the back of the eco-friendly formwork can increase the integrity of the eco-friendly formwork and the foamed soil.

[0039] 3. The slope is vertically divided into several support and planting sections, which improves slope stability. The lower layer of eco-friendly, non-removable formwork can support the upper layer of eco-friendly, non-removable formwork, reducing slope slippage. It can also be adjusted according to the fill height, making it highly adaptable to construction.

[0040] 4. Water pipes are used to drain the moisture from the original soil, reducing the pore water pressure of the excavated soil and effectively ensuring the stability of the soil. The drained rainwater is filtered through the planting trough filter sand layer and then collected in the gravel water storage layer, which can be used for the subsequent maintenance of green plants and turf, reducing maintenance costs.

[0041] 5. Lightweight foamed soil and eco-friendly, non-removable formwork are used on the fill side, which speeds up construction and effectively reduces the construction period.

[0042] 6. The partition board can be directly installed in the partition board groove of the adjacent eco-friendly no-removal formwork, which effectively and significantly improves the pouring efficiency of foamed soil. Attached Figure Description

[0043] Figure 1 This is a schematic diagram of a semi-fill / semi-excavation ecological foam soil subgrade structure that does not require formwork removal;

[0044] Figure 2This is a cross-sectional view of a semi-fill / semi-cut ecological foamed soil subgrade that does not require formwork removal. Figure 1 (Cross section AA)

[0045] Figure 3 This is a detailed drawing of the connection node between the eco-friendly, non-removable formwork and the strip foundation. Figure 1 (Details of node A in the middle)

[0046] Figure 4 This is a detailed drawing of the connection nodes of the water diversion pipe, prestressed anchor cable, and reinforcing mesh on the excavation bench. Figure 1 (Details of node B in the middle)

[0047] Figure 5 This is an elevation view of a semi-fill / semi-excavation eco-friendly foamed soil subgrade structure that requires no formwork removal;

[0048] Figure 6 This is a schematic diagram showing the location of prestressed anchor cables in a semi-fill / semi-excavation ecological foamed soil subgrade that does not require formwork removal;

[0049] Figure 7 This is a schematic diagram showing the location of the water pipe in the semi-fill / semi-excavation ecological foam soil subgrade that does not require formwork removal;

[0050] Figure 8 This is a schematic diagram of an eco-friendly, non-removable formwork structure (front panel orientation).

[0051] Figure 9 This is a schematic diagram of an eco-friendly, non-removable formwork structure (rear panel orientation).

[0052] Figure 10 It is an eco-friendly, non-removable formwork floor plan;

[0053] Figure 11 This is a schematic diagram of the water pipe structure;

[0054] Figure 12 This is a schematic diagram of the structure of a decorative tube and a solid tube;

[0055] Figure 13 This is a schematic diagram of the structure after step S2 is completed;

[0056] Figure 14 This is a schematic diagram of the structure after step S3 is completed;

[0057] Figure 15 This is a cross-sectional view after step S3 is completed;

[0058] Figure 16 This is a cross-sectional view after step S4 is completed;

[0059] Figure 17 This is a cross-sectional view after step S5 is completed;

[0060] Figure 18 This is a schematic diagram of the structure after step S6 is completed;

[0061] Figure 19 This is a cross-sectional view after step S6 is completed;

[0062] Figure 20 This is a structural diagram after step S7 is completed.

[0063] Figure 21 This is a structural diagram after step S9 is completed;

[0064] Figure 22 This is a schematic diagram of the structure after step S10 is completed;

[0065] Figure 23 This is a flowchart of the construction method for semi-cut and semi-fill ecological lightweight roadbed that does not require formwork removal.

[0066] The diagram is labeled as follows: 1-Original ground surface, 101-Existing soil, 2-Step, 3-Strip foundation, 301-Groove, 4-Eco-friendly formwork that does not require removal, 401-Front slab, 402-Rear slab, 403-Bottom slab, 404-Water pipe hole, 405-Anchor cable hole, 406-Splicing protrusion, 407-Splicing groove, 408-Separated slab groove, 409-Reserved bent reinforcement, 4010-Rough surface, 5-Water pipe, 501-Flower pipe, 502-Filter geotextile, 503-Solid pipe, 504 - Small diameter crushed stone, 505-Filter end, 6-Prestressed anchor cable, 601-Anchor body, 602-Anchor head, 7-Foamed soil, 701-Layered pouring, 8-Reinforcing mesh, 9-Subbase, 10-Waterproof geotextile, 11-Structural waterproof layer, 12-Road structure layer, 13-Crushed stone water storage layer, 14-Filter sand layer, 15-Planting soil layer, 16-Turf, 17-Green plants, 18-Slope bottom drainage ditch, 19-Slope top drainage ditch, 20-Guardrail, 21-Divider board, 22-U-shaped anchor nail. Detailed Implementation

[0067] To enhance understanding of the present invention, reference will be made below. Figures 1 to 23 The embodiments of the present invention will be described in detail below. The following embodiments are implemented based on the technical solution of the present invention and provide detailed implementation methods. However, the protection scope of the present invention is not limited to the following embodiments.

[0068] In this embodiment, the backfill height is 3m, the height of the front plate 401 of the eco-friendly non-removable formwork 4 is 0.3m, the height of the rear plate 402 is 1.1m, the width of the bottom plate 403 is 0.8m, the overlap height of the upper and lower eco-friendly non-removable formwork 4 is 15cm, the size of the strip foundation 3 is 0.5m×1.2m, and the top is provided with a groove 301 with a depth of 0.1m and a width of 0.85m; each eco-friendly non-removable formwork 4 is provided with a water pipe 5 and a prestressed anchor cable 6; the reinforcing mesh 8 is made of galvanized iron wire mesh of @5cm×5cm.

[0069] Regarding the above-mentioned semi-cut / semi-fill ecological lightweight roadbed construction method without formwork removal, combined with the attached... Figure 23 As shown, the following construction steps are adopted:

[0070] S1, Excavation of Step 2 and Strip Foundation 3: Construction in conjunction with Appendix Figure 13 As shown, the natural surface is cleared and treated, the excavation section is excavated into a stepped shape 2; the fill section is excavated into a strip foundation trench, the bottom bedding layer 9 is constructed, and concrete is poured to form a strip foundation 3, and a drainage ditch 18 is excavated on the outside of the strip foundation 3.

[0071] Combined with the appendix Figure 1 Appendix Figure 3 As shown, the top of the strip foundation 3 is provided with a groove 301 that matches the bottom plate 403 of the eco-friendly, non-removable template 4.

[0072] S2. Laying waterproof geotextile 10: Combined with the attached Figure 13 As shown, 10 sections of full-section waterproof geotextile were laid at the fill section and the two excavation steps.

[0073] S3, Eco-friendly Non-removable Template 4 Installation: Combined with attached... Figure 8 ~Attached Figure 10 Appendix Figure 14 Appendix Figure 15 As shown.

[0074] S3.1, Prefabricated eco-friendly non-removable formwork 4, which consists of a front plate 401, a rear plate 402 and a bottom plate 403. The bottom plate 403 is provided with a reserved bending rib 409. The front plate 401 and the rear plate 402 are respectively provided with splicing protrusions 406 and splicing grooves 407 on both sides. A small piece is reserved in each of the splicing protrusions 406 and splicing grooves 407 in the rear plate 402. After splicing, a partition plate groove 408 is formed. A water pipe hole 404 and an anchor cable hole 405 are provided in the rear plate 402. The back of the rear plate 402 is roughened to form a rough surface 4010.

[0075] S3.2 When constructing the bottom layer of ecological non-removable formwork 4, pour a layer of mortar into the groove 301 at the top of the strip foundation 3, place the prefabricated ecological non-removable formwork 4 in the groove 301, with the front plate 401 facing the slope side and the rear plate 402 facing the backfill side, and the splicing protrusion 406 of the adjacent ecological non-removable formwork 4 is engaged with the splicing groove 407.

[0076] S3.3 When constructing the non-bottom layer ecological non-removable formwork 4, after the lower layer of foamed soil 7 has reached a certain strength, an ecological non-removable formwork 4 is installed on top of the foamed soil 7, with the front plate 401 of the upper layer ecological non-removable formwork 4 abutting against the rear plate 402 of the lower layer ecological non-removable formwork 4.

[0077] Combined with the appendix Figure 12As shown, the partitioned panel groove 408 is located on the outside of the splicing protrusion 406 and splicing groove 407 of the eco-friendly non-removable template 4. After adjacent splicing protrusions 406 and splicing grooves 407 of the eco-friendly non-removable template 4 are spliced ​​together, the partitioned panel groove 408 is formed; combined with the attached... Figure 1 Appendix Figure 3 As shown, the overlap height between the front panel 401 of the upper eco-friendly non-removable formwork 4 and the rear panel 402 of the lower eco-friendly non-removable formwork 4 is not less than 10cm.

[0078] Construction of S4, prestressed anchor cable 6 and water pipe 5: (in conjunction with attached...) Figure 11 Appendix Figure 12 Appendix Figure 16 As shown.

[0079] S4.1 Drill water pipe holes 404 and anchor cable holes 405 at even intervals at step 2 to a specified depth.

[0080] S4.2. Construct water pipe 5. The front end of water pipe 5, the perforated pipe 501, is wrapped with filter geotextile 502 and inserted into the water pipe hole 404 at step 2. The solid pipe 503 section is filled with small-diameter crushed stone 504 and inserted into the water pipe hole 404 of the ecological non-removable template 4.

[0081] S4.3. The gap between the water pipe 5 and the water pipe hole 404 at step 2 is filled with gravel, and a reverse filter end 505 is installed at the outer end of the water pipe hole 404 of the ecological non-removable template 4.

[0082] S4.4 Insert the prestressed anchor cable 6 into the anchor cable hole 405 of the eco-friendly non-removable formwork 4, and simultaneously insert it into the corresponding anchor cable hole 405 on the step 2. Grout the end to form an anchor body 601. The prestressed anchor cable 6 is initially anchored on the side of the eco-friendly non-removable formwork 4 using the anchor head 602.

[0083] Combined with the appendix Figure 1 Appendix Figure 6 Appendix Figure 7 As shown, the anchor cable hole 405 and water pipe hole 404 on step 2 correspond one-to-one with the anchor cable hole 405 and water pipe hole 404 on the eco-friendly non-removable template 4. The anchor cable hole 405 on step 2 is inclined to the excavation side on the backfill side, and the water pipe hole 404 is inclined to the backfill side on the excavation side.

[0084] S5, Install partition board 21: Combine with attachment Figure 17 As shown, the pouring area of ​​this layer is divided into sections using partition plates 21. The partition plates 21 are inserted into the partition plate grooves 408, and the gaps on both sides are filled with foam adhesive.

[0085] Combined with the appendix Figure 2 As shown, the thickness of partition plate 21 matches that of partition plate groove 408.

[0086] S6, Reinforcing Mesh 8 Construction: Combined with Appendix Figure 4 Appendix Figure 18 , overlook Figure 19 As shown.

[0087] S6.1. Fabricate reinforcing mesh 8. The end of reinforcing mesh 8 that connects to step 2 has an upward folded end.

[0088] S6.2 Lay the reinforcing mesh 8 in this layer, overlap the straight section with the pre-reserved bent bar 409 of the eco-friendly non-removable formwork 4 and tie it; the folded end contacts the vertical part of the step 2 and is fixed to the side of the step 2 with U-shaped anchor nails 22.

[0089] S7, Pouring Foamed Soil 7: Combined with Appendix Figure 20 As shown.

[0090] S7.1. Prepare foamed soil 7, and pour the layered concrete in the partitioned area 21 of this layer using the skip-pour method, pouring it up to the installation plane of the ecological non-removable formwork 4 of the next layer.

[0091] S7.2 After the foamed soil 7 reaches a certain strength, the partition board 21 is removed, and the foamed soil 7 in the adjacent partition area is poured up to the installation plane of the upper layer of ecological non-removable formwork 4.

[0092] S8. Tensioning of prestressed anchor cable 6: After the foamed soil 7 in this layer reaches a certain strength, the prestressed anchor cable 6 is tensioned and anchored with anchor head 602, and the anchor head 602 is treated with anti-corrosion.

[0093] S9. Cyclic Construction: Combined with Appendix Figure 2 Appendix Figure 21 As shown, the construction is carried out in layers according to the order of S3 to S9. First, the ecological non-removable formwork 4 of this layer is installed. Then, the prestressed anchor cable 6 and water pipe 5 of this layer are constructed. Next, the partition plate 21 and reinforcing mesh 8 of this layer are installed. Finally, the foamed soil 7 of this layer is poured until the top surface of the roadbed is reached.

[0094] Combined with the appendix Figure 16 ~Attached Figure 18 As shown, each eco-friendly, non-removable formwork 4 is equipped with a prestressed anchor cable 6 and a water pipe 5, and a layer of reinforcing mesh 8 is provided on its base plate 403; the upper prestressed anchor cable 6 and the bottom reinforcing mesh 8 are combined with the groove 301 of the strip foundation 3 or the lower eco-friendly, non-removable formwork 4 to form multiple fixation.

[0095] Combined with the appendix Figure 5 As shown, the upper layer of eco-friendly non-removable formwork 4 and the lower layer of eco-friendly non-removable formwork 4 are spliced ​​together with staggered joints.

[0096] S10, Road surface structure layer (12) construction: combined with attached Figure 22As shown, a structural waterproof layer (11) is constructed on the top surface of the roadbed, and a pavement structure layer 12 is constructed in sequence above the structural waterproof layer 11. Guardrails 20 are installed on both sides of the pavement structure layer 12, and a slope top drainage ditch 19 is constructed on the outside of the guardrails 20.

[0097] S11. Slope backfilling and planting: (in conjunction with attached...) Figure 1 Appendix Figure 6 Appendix Figure 7 As shown, a gravel water storage layer 13, a filter sand layer 14, and a planting soil layer 15 are sequentially backfilled in the planting trough between the front plate 401 and the rear plate 402 of the eco-friendly non-removable template 4. Turf 16 and landscape green plants 17 are then laid on the top surface of the planting soil layer 15. The reverse filter end 505 is buried in the planting soil layer 15 to facilitate the drainage of soil water through the water pipe 5 into the planting trough of the eco-friendly non-removable template 4. After being filtered by the filter sand layer 14, the water is stored in the gravel water storage layer 13 for the irrigation of the green plants 17.

[0098] The above embodiments are only used to explain the technical concept of the present invention, and are not intended to limit the protection of the present invention. Any non-substantial modifications made to the present invention using this concept should fall within the protection scope of the present invention.

Claims

1. A semi-cut / semi-fill ecological lightweight roadbed construction method without formwork removal, characterized in that: The construction steps include the following: S1. Construction of excavated steps (2) and strip foundation (3): The natural surface is cleared and treated. The excavation section is excavated into steps (2). The filling section is excavated into strip foundation trenches. The bottom layer (9) is constructed and concrete is poured to form strip foundation (3). The bottom drainage ditch (18) is excavated on the outside of the strip foundation (3). S2. Laying waterproof geotextile (10): Laying full-section waterproof geotextile (10) at the fill section and excavation steps (2). S3, Eco-friendly non-removable formwork (4) installation: S3.1, Prefabricated eco-friendly non-removable formwork (4), eco-friendly non-removable formwork (4) consists of a front plate (401), a rear plate (402) and a bottom plate (403). The bottom plate (403) is provided with a reserved bending rib (409). The front plate (401) and the rear plate (402) are respectively provided with splicing protrusions (406) and splicing grooves (407) on both sides. A small piece is reserved in each of the splicing protrusions (406) and splicing grooves (407) on the rear plate (402). After splicing, a partition plate groove (408) is formed. A water pipe hole (404) and an anchor cable hole (405) are provided on the rear plate (402). The back of the rear plate (402) is roughened to form a rough surface (4010). S3.2 When the bottom ecological non-removable formwork (4) is being built, a layer of mortar is poured into the groove (301) at the top of the strip foundation (3), and the prefabricated ecological non-removable formwork (4) is placed in the groove (301), with the front plate (401) facing the slope side and the rear plate (402) facing the backfill side. The splicing protrusion (406) of the adjacent ecological non-removable formwork (4) is engaged with the splicing groove (407). S3.3 When constructing the non-bottom layer ecological non-removable formwork (4), after the lower layer of foam soil (7) has reached a certain strength, an ecological non-removable formwork (4) is installed on top of the foam soil (7), and the front plate (401) of the upper layer ecological non-removable formwork (4) abuts against the back plate (402) of the lower layer ecological non-removable formwork (4). S4. Construction of prestressed anchor cables (6) and water pipes (5): S4.1 Drill water pipe holes (404) and anchor cable holes (405) at even intervals at step (2) to a specified depth. S4.

2. Make a water pipe (5). The front end of the water pipe (5) is wrapped with a filter geotextile (502) and inserted into the water pipe hole (404) at the step (2). The solid pipe (503) section is filled with small diameter gravel (504) and inserted into the water pipe hole (404) of the ecological non-removable template (4). S4.

3. The gap between the water pipe (5) and the water pipe hole (404) at the step (2) is filled with gravel, and a reverse filter end (505) is set at the outer end of the water pipe hole (404) of the ecological non-removable template (4). S4.4 Insert the prestressed anchor cable (6) into the anchor cable hole (405) of the eco-friendly non-removable template (4) and simultaneously insert it into the corresponding anchor cable hole (405) on the step (2). Grout the end to form an anchor body (601). The prestressed anchor cable (6) is initially anchored on the side of the eco-friendly non-removable template (4) using the anchor head (602). S5. Install partition plate (21): The pouring area of ​​this layer is divided into partition plates (21). The partition plate (21) is inserted into the partition plate groove (408), and the gaps on both sides are filled with foam glue. S6, Reinforcing Mesh (8) Construction: S6.1, Make a reinforcing mesh (8), the end of the reinforcing mesh (8) connected to the step (2) is provided with an upward folded end; S6.2 Lay out the reinforcing mesh (8) of this layer, overlap the straight section with the pre-reserved bent bar (409) of the eco-friendly non-removable template (4) and tie it; the folded end contacts the step (2) vertically and is fixed to the side of the step (2) with U-shaped anchor nails (22); S7, Pouring foamed soil (7): S7.

1. Make foam soil (7) and pour the sectional board (21) of this layer in layers using the skip-pour method, pouring to the installation plane of the ecological non-removable formwork (4) of the next layer. S7.2 After the foamed soil (7) reaches a certain strength, the partition board (21) is removed, and the foamed soil (7) in the adjacent partition area is poured up to the installation plane of the upper layer of ecological non-removable template (4). S8. Tensioning prestressed anchor cable (6): After the foamed soil (7) in this layer reaches a certain strength, the prestressed anchor cable (6) is tensioned and the anchor head (602) is anchored, and the anchor head (602) is treated with anti-corrosion. S9. Cyclic construction: Layered construction is carried out in the order of S3~S9. First, the ecological non-removable formwork (4) of this layer is installed. Then, the prestressed anchor cable (6) and water pipe (5) of this layer are constructed. Next, the partition plate (21) and reinforcing mesh (8) of this layer are installed. Finally, the foamed soil (7) of this layer is poured until the top surface of the subgrade is reached. S10, Construction of pavement structure layer (12): A structural waterproof layer (11) is constructed on the top surface of the roadbed. The pavement structure layer (12) is constructed in sequence above the structural waterproof layer (11). Guardrails (20) are installed on both sides of the pavement structure layer (12), and a slope top drainage ditch (19) is constructed on the outside of the guardrails (20). S11. Slope backfilling and planting: In the planting trough between the front plate (401) and the back plate (402) of the ecological non-removable template (4), the gravel water storage layer (13), the filter sand layer (14) and the planting soil layer (15) are backfilled in sequence, and turf (16) and landscape green plants (17) are laid on the top surface of the planting soil layer (15).

2. The semi-cut / semi-fill ecological lightweight roadbed construction method without formwork removal according to claim 1, characterized in that, In S1, the top of the strip foundation (3) is provided with a groove (301) that matches the bottom plate (403) of the eco-friendly non-removable template (4).

3. The semi-cut / semi-fill ecological lightweight roadbed construction method without formwork removal according to claim 1, characterized in that, In S3, the partition plate groove (408) is located outside the splicing protrusion (406) and splicing groove (407) of the eco-friendly non-removable template (4). After the adjacent eco-friendly non-removable template (4) splicing protrusion (406) and splicing groove (407) are spliced ​​together, the partition plate groove (408) is formed.

4. The semi-cut / semi-fill ecological lightweight roadbed construction method without formwork removal according to claim 1, characterized in that, In S3, the overlap height between the front plate (401) of the upper ecological non-removable template (4) and the rear plate (402) of the lower ecological non-removable template (4) is not less than 10cm.

5. The semi-cut / semi-fill ecological lightweight roadbed construction method without formwork removal according to claim 1, characterized in that, In S4, the anchor cable hole (405) and water pipe hole (404) on the step (2) correspond one-to-one with the anchor cable hole (405) and water pipe hole (404) on the ecological non-removable template (4). The anchor cable hole (405) on the step (2) is inclined to the excavation side on the backfill side, and the water pipe hole (404) is inclined to the backfill side on the excavation side.

6. The method for constructing semi-cut / semi-fill ecological lightweight roadbed without formwork removal according to claim 1, characterized in that, In S5, the thickness of the partition plate (21) matches the partition plate groove (408).

7. The method for constructing semi-cut / semi-fill ecological lightweight roadbed without formwork removal according to claim 1, characterized in that, In S9, the upper layer of eco-friendly non-removable template (4) and the lower layer of eco-friendly non-removable template (4) are spliced ​​together in a staggered manner.

8. The method for constructing semi-cut / semi-fill ecological lightweight roadbed without formwork removal according to claim 1, characterized in that, In S11, the reverse filter end (505) is buried in the planting soil layer (15) so that the soil water can be discharged into the planting trough of the ecological non-removable template (4) through the water pipe (5) and stored in the gravel water storage layer (13) after being filtered by the filter sand layer (14) for the irrigation of the green plants (17).

Images