Old bridge top earthing greening and construction method

Abstract

The invention discloses an old bridge top soil covering greening and construction method, and relates to the technical field of landscaping, the old bridge top soil covering greening is installed on a current bridge plate, and comprises a damaged part cement mortar repairing layer, and the damaged part cement mortar repairing layer is located on the upper surface of the current bridge plate; a waterproof roll layer, first geotechnical cloth, a water storage layer, a light soil layer and a greening layer are sequentially arranged on the upper surface of the damaged part cement mortar repairing layer from bottom to top according to the construction sequence. The method has the effects of covering vegetation on the original bridge floor and reducing the influence of load on the bridge body.

Description

Technical Field

[0001] The invention relates to the technical field of gardening and greening, and in particular to a soil-covering greening method for an old bridge top and a construction method thereof. Background Art

[0002] Gardening refers to an activity that uses the principles and techniques of gardening art to plan and purposefully arrange natural elements such as plants, water bodies, rocks, and artificial facilities such as buildings within a certain geographical area to create beautiful and comfortable artificial natural landscapes in order to improve the environment, beautify life, and enrich people's spiritual and cultural life. It includes a series of work such as plant planting, landscape design, engineering construction, and post-maintenance, with the goal of creating green spaces with ecological, social, and economic benefits.

[0003] Urban bridge deck greening is an important part of the urban three-dimensional greening system, which aims to alleviate the segmentation effect of urban bridges on the continuity of urban texture and ecosystem. However, due to the load limit of the bridge body, the existing bridge deck greening is mostly limited to the median strip and simple vegetation coverage, with a single landscape effect, and the biodiversity and ornamental value need to be improved. Summary of the invention

[0004] The present application provides a soil covering and greening method for the top of an old bridge, which has the effect of covering the original bridge deck with vegetation and reducing the impact of the load on the bridge body.

[0005] This application provides a method for greening the top of an old bridge using the following technical solutions: A soil-covered greening system for the top of an old bridge and a construction method thereof, wherein the soil-covered greening system for the top of an old bridge is installed on an existing bridge deck, and comprises a cement mortar repair layer for damaged parts, wherein the cement mortar repair layer for damaged parts is located on the upper surface of the existing slab bridge, and a waterproof membrane layer, a first geotextile, a water storage layer, a lightweight soil layer and a greening layer are sequentially arranged on the upper surface of the cement mortar repair layer for damaged parts in a construction order from bottom to top.

[0006] By adopting the above technical scheme, on the existing bridge deck of the original old bridge, the damaged parts on the existing bridge deck are first repaired with cement mortar; thereby providing a flat and stable base for the subsequent covering and greening layer, and sequentially constructing the waterproof membrane layer, the first geotextile, the water storage layer, the lightweight soil layer and the greening layer from bottom to top, through the combination of multiple layers of materials, the problems of urban bridge body dividing the city and ecological environment discontinuity can be solved; it will enhance biodiversity and beauty, and add certain recreational facilities without affecting urban traffic, which has the effect of covering vegetation on the original bridge deck and reducing the impact of load on the bridge body.

[0007] Preferably, the waterproof coiled material layer is a glass fiber reinforced PVC waterproof coiled material.

[0008] By adopting the above technical solution, the glass fiber reinforced PVC waterproof membrane further improves the tensile strength and tear strength of the membrane, enhances the integrity and deformation resistance of the waterproof layer, and can effectively resist the stress caused by factors such as foundation settlement and temperature changes.

[0009] Preferably, the cement mortar repair layer at the damaged part and the waterproof membrane layer are bonded by a non-curing modified asphalt waterproof coating.

[0010] By adopting the above technical solution and using non-curing modified asphalt waterproof coating, with its excellent adhesion and waterproof properties, it can effectively enhance the interface bonding strength between the cement mortar repair layer and the waterproof membrane layer, forming an integrated waterproof structure and significantly improving the overall waterproof performance.

[0011] Preferably, during construction, two adjacent waterproof membrane layers are overlapped by 150-200 mm to form a first overlap seam.

[0012] By adopting the above technical solution, the overlap width of the membrane of 150-200mm ensures sufficient overlapping area, effectively compensates for the edge defects and construction gaps of the waterproof membrane layer, and facilitates the subsequent sealing process, thereby ensuring the waterproof reliability of the overlapped parts.

[0013] Preferably, during construction, two adjacent first geotextiles are overlapped by 150-200 mm to form a second overlap seam, and the first overlap seam and the second overlap seam are staggered.

[0014] By adopting the above technical solution, the staggered overlap between the first overlap seam and the second overlap seam can effectively disperse the stress and avoid stress concentration on a single overlap seam, thereby improving the tensile strength and crack resistance of the overall structure.

[0015] Preferably, a plurality of drainage cages are arranged between the first geotextile and the aquifer.

[0016] By adopting the above technical solution, the internal structure design of the seepage cage has a high porosity to ensure the free infiltration of water; when the groundwater level rises, excess water can be effectively discharged through the seepage cage to prevent the aquifer from being saturated and the generation of excessive water pressure.

[0017] Preferably, the drainage cages are distributed in a grid shape.

[0018] By adopting the above technical solution, the grid-like arrangement ensures that the drainage cages are evenly distributed in the drainage area, avoiding local low drainage efficiency, thereby achieving an overall balance of drainage efficiency in the area.

[0019] Preferably, the outer surface of the drainage cage is wrapped with a second geotextile.

[0020] By adopting the above technical solution, the second geotextile acts as a filter layer to effectively intercept fine particles and sediments, preventing them from entering the drainage cage and maintaining its long-term stable water permeability.

[0021] Preferably, the light soil layer is any one of light soil and peat soil, or a mixture thereof.

[0022] By adopting the above technical solution, the lightweight soil layer provides the soil medium required for the growth of plants, and the selection of lightweight soil and peat soil can reduce the overall load of the bridge.

[0023] Preferably, a construction method for covering the top of an old bridge with soil and greening is based on the above-mentioned covering the top of an old bridge with soil and greening, and the construction steps include: S1: Check the existing foundation bridge slab; Ensure that the base bridge deck is flat, firm, and free of cracks or obvious defects; if there are any problems, mark them with a marker pen; and clean the surface of the bridge deck to remove dust and debris; S2: Cement mortar repair; Use 1:2.5 cement mortar to repair the damaged parts marked on the existing bridge deck, and obtain a cement mortar repair layer at the damaged part; thus providing a flat and stable base for the subsequent covering greening layer; S3: Laying of waterproof membrane layer; Apply non-curing modified asphalt waterproof coating on the upper surface of the cement mortar repair layer at the damaged part; lay 1.5mm thick glass fiber reinforced PVC waterproof membrane according to the design requirements, keep the overlap width at 150-200mm, and use appropriate adhesive to bond; seal the joints and edges of the membrane to prevent water leakage, so as to obtain a waterproof membrane layer; S4: laying of the first geotextile; Lay the first geotextile on the waterproof membrane layer, and keep the overlap width at 150-200mm; S5: Install the drainage cage; Wrap the drainage cage with the second geotextile to prevent soil particles from entering the drainage channel and affecting the drainage effect. Then lay the drainage cage with the second geotextile on the upper surface of the first geotextile and arrange the drainage cage in a 1m*1m grid to ensure smooth drainage. S6: Laying of aquifer and light soil layer; Evenly lay a 100mm thick Po-LS light soil water storage matrix; pay attention to the thickness to be uniform, avoid being too thick or too thin in some areas; and lay a light soil layer, which is a nutrient matrix mixed with light soil and peat soil; S7: Plant planting; Choose plant species suitable for roof greening, taking into account their drought resistance, cold resistance, and wind resistance, and plant plants according to design requirements, ensuring that the spacing between plants is appropriate to avoid affecting each other's growth; water them sufficiently after planting to ensure the survival of the plants; S8: Daily maintenance; Water according to weather conditions and plant growth, keeping the soil moist but not waterlogged; fertilize according to plant growth to supplement nutrients; then remove weeds regularly to prevent weeds from competing with plants for nutrients; and take timely prevention and control measures for pests and diseases when discovered.

[0024] By adopting the above technical scheme, a low-maintenance, low-cost, sustainable and low-load bridge deck greening base structure greening construction method is formed through the construction steps of checking the existing foundation bridge slab, repairing cement mortar, laying the waterproof membrane layer, laying the first geotextile, installing the drainage cage, laying the aquifer and lightweight soil layer, planting plants and daily maintenance.

[0025] In summary, this application has the following beneficial effects: 1. The top of the old bridge is covered with soil and greened. On the existing bridge deck of the original old bridge, the damaged parts on the existing bridge deck are first repaired with cement mortar. This provides a flat and stable base for the subsequent covering greening layer. The waterproof membrane layer, the first geotextile, the water storage layer, the lightweight soil layer and the greening layer are constructed from bottom to top. Through the combination of multiple layers of materials, the problems of urban bridge body dividing the city and ecological environment discontinuity can be solved. It will enhance biodiversity and beauty, and add certain recreational facilities without affecting urban traffic. It has the function of covering vegetation on the original bridge deck and reducing the impact of load on the bridge body.

[0026] 2. The construction method of covering the top of the old bridge with soil and greening forms a low-maintenance, low-cost, sustainable and low-load greening construction method for the base structure of the bridge deck through the following construction steps: inspection of the existing foundation bridge deck, repair of cement mortar, laying of the waterproof membrane layer, laying of the first geotextile, installation of drainage cages, laying of the aquifer and lightweight soil layer, planting of plants and daily maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the internal structure of the old bridge top covered with soil and greening in this embodiment; Figure 2 This is a construction flow chart of covering the top of an old bridge with soil and greening in this embodiment; Figure 3 This is a schematic diagram of the overall structure of the old bridge top covered with soil and greening in this embodiment; Explanation of the accompanying reference numerals: 1. Existing bridge deck; 2. Cement mortar repair layer at damaged parts; 3. Waterproof membrane layer; 4. First geotextile; 5. Aquifer; 6. Light soil layer; 7. Greening layer; 8. Non-curing modified asphalt waterproof coating; 9. Seepage cage. DETAILED DESCRIPTION

[0028] The present application is further described in detail below in conjunction with the accompanying drawings. It is necessary to point out here that the following specific implementation methods are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Technical personnel in this field can make some non-essential improvements and adjustments to the present application based on the above application content. Example

[0029] The present invention discloses a soil covering and greening method for an old bridge top, such as Figure 1 As shown, the old bridge top covering soil and greening is installed on the existing bridge deck 1, which includes a cement mortar repair layer 2 at the damaged part, and the cement mortar repair layer 2 at the damaged part is located on the upper surface of the existing bridge deck, and a 1:2.5 cement mortar is used to repair the damaged part on the existing bridge deck 1; thereby providing a flat and stable base for the subsequent covering soil and greening layer 7; the repaired flat surface can better bear the weight of the covering soil and plants, prevent the covering soil from sinking or the plant roots from damaging the bridge deck structure; by providing a stable base, it provides support for the subsequent covering soil layer, and indirectly increases the overall bearing capacity of the bridge.

[0030] like Figure 1 As shown, a waterproof membrane layer 3, a first geotextile 4, an aquifer 5, a lightweight soil layer 6 and a greening layer 7 are sequentially arranged on the upper surface of the cement mortar repair layer 2 at the damaged part in accordance with the construction sequence from bottom to top.

[0031] like Figure 1 As shown, the cement mortar repair layer 2 at the damaged part provides a flat and solid base to provide support for the superstructure and prevent subsequent construction from causing damage to the bridge deck.

[0032] like Figure 1As shown, the waterproofing membrane layer 3 is used to prevent rainwater from penetrating into the interior of the bridge structure, prevent the bridge deck from being corroded and damaged by long-term immersion, and protect the bridge structure; and the waterproofing membrane layer 3 adopts 1.5mm thick glass fiber reinforced PVC waterproofing membrane, which has good waterproof performance, aging resistance, and certain strength and flexibility; the glass fiber reinforcement layer further improves the tensile strength and tear strength of the membrane, enhances the integrity and deformation resistance of the waterproof layer, and can effectively resist the stress caused by factors such as foundation settlement and temperature changes; and the thickness of 1.5mm provides sufficient waterproof protection; and the two adjacent waterproofing membrane layers 3 are overlapped by 150-200mm during construction to form a first overlap seam, forming a multi-layer protection, improving the overall reliability of the waterproof layer, and reducing the risk of water leakage; even if a part of the membrane is damaged, the rest can effectively prevent water penetration; the overlap width of 150-200mm ensures sufficient overlapping area, which can effectively overcome the defects of the membrane edge and the gaps that may appear during the construction process; the overlap width is large enough, which is also convenient for subsequent sealing treatment to ensure the waterproof performance of the overlapped parts.

[0033] like Figure 1 As shown, the cement mortar repair layer 2 at the damaged part and the waterproof membrane layer 3 are bonded together by a non-curing modified asphalt waterproof coating 8; the principle is to utilize the adhesion and waterproof properties of the non-curing modified asphalt waterproof coating 8 to firmly bond the cement mortar repair layer and the waterproof membrane layer 3 together to form a whole, thereby achieving a better waterproof effect.

[0034] like Figure 1 As shown, the asphalt component in the non-curing modified asphalt waterproof coating 8 has a strong adhesion to the cement mortar and the surface of the waterproof membrane, and can firmly bond the two together to form a continuous waterproof layer; the addition of the modifier further enhances its bonding strength and flexibility, and can adapt to the slight deformation between the base layer and the membrane; moreover, the coating itself has good waterproof properties, which can effectively prevent moisture from penetrating between the cement mortar repair layer and the waterproof membrane layer 3 to prevent leakage; this layer of coating also plays a buffering role, reducing the impact of base deformation on the waterproof layer.

[0035] like Figure 1 As shown, the function of the first geotextile 4 is isolation, which is used to prevent fine particles in the aquifer 5 from leaking into the waterproof layer, while improving the stability of the aquifer 5 and preventing plant roots from penetrating the waterproof layer.

[0036] like Figure 1As shown, two adjacent 400g / m2 first geotextiles 4 are overlapped by 150-200mm during construction to form a second overlap seam, and the first overlap seam and the second overlap seam are staggered. If only a single overlap seam is used, when the first geotextile 4 is subjected to tension, the stress will be concentrated at the overlap seam, which may easily lead to damage or failure there. However, by adopting staggered overlap, the stress is dispersed to the first overlap seam and the second overlap seam, reducing the single-point stress and improving the overall tensile strength. Moreover, staggered overlap can effectively prevent water from penetrating along a single overlap seam, because even if a small leakage occurs in one overlap seam, the other staggered overlap seam can also play a blocking role, thereby enhancing the overall anti-seepage performance.

[0037] like Figure 1 As shown, a plurality of seepage cages 9 are arranged between the first geotextile 4 and the aquifer 5. The internal structure of the seepage cages 9 is arranged with a large porosity to allow water to flow freely. When the water level in the aquifer 5 rises, excess water will be discharged through the gaps in the seepage cages 9 to avoid saturation of the aquifer 5 or even excessive water pressure. At the same time, the seepage cages 9 can also intercept a portion of suspended matter and fine particles to prevent them from entering the aquifer 5, blocking the gaps in the aquifer 5 and affecting its water storage and drainage functions.

[0038] like Figure 1 As shown, in general, setting a drainage cage 9 between the first layer of geotextile and the aquifer 5 is an effective engineering measure, which can effectively improve the performance and life of the aquifer 5 and reduce maintenance costs; it plays a dual role of protecting the aquifer 5 and improving water storage efficiency.

[0039] like Figure 1 As shown, the seepage and drainage cages 9 are arranged in a 1m*1m grid. The grid arrangement can evenly distribute the seepage and drainage cages 9 in the area that needs drainage, avoid local poor drainage, and ensure consistent drainage efficiency in the entire area. If it is simply arranged in a stacked manner, it is easy for local drainage to be too fast and other areas to drain slowly, reducing the overall efficiency. Moreover, the grid arrangement can enable the seepage and drainage cages 9 to support each other, enhance the stability of the overall structure, and resist external loads and deformation.

[0040] like Figure 1As shown, the outer surface of the seepage cage 9 is wrapped with a second geotextile; the second geotextile, as a filter material, can effectively intercept fine particles and sediments, preventing them from entering the interior of the seepage cage 9, thereby maintaining good water permeability of the seepage cage 9; in this way, the geotextile plays an isolation role to a certain extent, preventing the direct mixing of soil and water; and the wrapping of the second geotextile provides additional protection for the seepage cage 9, avoiding damage to the structure of the seepage cage 9 due to external pressure or impact, and improving the overall stability and durability of the seepage cage 9; in addition, the second geotextile can also help retain moisture and nutrients in the aquifer 5, promoting plant growth or ecological protection.

[0041] like Figure 1 As shown, the aquifer 5 is used to store rainwater and irrigation water, provide moisture for plants, reduce irrigation frequency, and reduce maintenance costs; and the aquifer 5 uses a 100mm water storage matrix Po--LS.

[0042] like Figure 1 As shown, the obtained light soil layer 6 provides the soil medium required for the growth of plants. Selecting light soil can reduce the overall load of the bridge.

[0043] like Figure 1 As shown, the greening layer 7 is not only covered with green, but also forms a planting combination with multiple varieties and levels to enrich the urban biodiversity; plants suitable for growth in the bridge area are selected; more than 100 native plants are matched to reflect the plant characteristics of the bridge area, forming a sustainable and low-maintenance habitat garden under the bridge. In spring, catalpa and roses are mainly seen, in summer there are some summer flowers such as trumpet creepers, in autumn there are red maples, and in winter some evergreen tree species are planted, such as boxwood balls, privet balls, as well as euonymus balls, white pine, red yew, etc., to ensure the viewing effect in the four seasons in the north; thereby beautifying the environment and improving the ecological environment around the bridge.

[0044] like Figure 2 As shown, the construction method of covering the top of the old bridge with soil and greening, the construction steps include: S1: Check the existing foundation bridge slab; Ensure that the base bridge deck is flat, firm, and free of cracks or obvious defects; if there are any problems, mark them with a marker pen; and clean the surface of the bridge deck to remove dust and debris; S2: Cement mortar repair; The damaged parts marked on the existing bridge deck 1 are repaired with cement mortar of 1:2.5, and a cement mortar repair layer 2 of the damaged parts is obtained; thereby providing a flat and stable base for the subsequent covering greening layer 7; S3: laying of waterproof membrane layer 3; Apply non-curing modified asphalt waterproof coating 8 on the upper surface of the cement mortar repair layer 2 at the damaged part; and lay 1.5mm thick glass fiber reinforced PVC waterproof membrane according to the design requirements, and keep the overlap width of 150-200mm, and use a suitable adhesive to bond; seal the joints, edges, etc. of the membrane to prevent water leakage, so as to obtain a waterproof membrane layer 3; S4: laying of the first geotextile 4; Lay the first geotextile 4 on the waterproof roll material layer 3, and keep the overlap width at 150-200mm; S5: Install the drainage cage 9; Wrap the drainage cage 9 with the second geotextile to prevent soil particles from entering the drainage channel and affecting the drainage effect. Then, lay the drainage cage 9 with the second geotextile on the upper surface of the first geotextile 4, and arrange the drainage cage 9 in a 1m*1m grid to ensure smooth drainage. S6: laying of aquifer 5 and light soil layer 6; Evenly lay a 100mm thick Po-LS light soil water storage matrix; pay attention to the thickness to be uniform, avoid being too thick or too thin in some parts; and lay a light soil layer 6, which is a nutrient matrix mixed with light soil and peat soil; S7: Plant planting; Choose plant species suitable for roof greening, taking into account their drought resistance, cold resistance, and wind resistance, and plant plants according to design requirements, ensuring that the spacing between plants is appropriate to avoid affecting each other's growth; water them sufficiently after planting to ensure the survival of the plants; S8: Daily maintenance; Water according to weather conditions and plant growth, keeping the soil moist but not waterlogged; fertilize according to plant growth to supplement nutrients; then remove weeds regularly to prevent weeds from competing with plants for nutrients; and take timely prevention and control measures for pests and diseases when discovered.

[0045] Considering the protection of the bridge body, the compressive strength of the retaining wall is improved through multiple methods without nailing pile force and without exceeding the ultimate load of the bridge body. First, the masonry structure with inserted bars and holes is used to greatly increase the bending, compression and shear resistance of the wall. Compared with solid blocks, it not only saves costs, but also has better stability and safety. At the same time, the proportion of white washed rice stone and white cement is increased by 10% in the masonry material ratio to form an imitation granite effect closer to golden hemp, but the cost is only 1 / 4 of granite.

[0046] Considering that the Muxidi Bridge has been in service for 30 years. When making the earth-covering structure, it is also necessary to combine the application of new materials and new technologies to achieve low-load and high-load structural performance. First, use the concrete surface layer of the bridge deck, and only add fine stone concrete in the drainage direction to drain the bottom layer of the bridge deck. Second, use PVC glass fiber rolls with strong root resistance, good waterproofness, good flexibility, and light weight. Third, use PVC seepage cages in a 91m*1m grid arrangement, wrapped with composite geotextiles, and set up drainage and filtration simultaneously. The fourth level is to fill the 1m*1m grid formed by the speed cage with a light matrix, and add nutrient soil on top for compaction. The saturated water weight of this matrix is ​​1 / 2 of normal soil. The entire structure is 1 / 6 less than the traditional roof earth-covering structure.

[0047] The most important thing about the greening of overhead structures is drainage. Excessive water load will cause the risk of collapse of the bridge body and retaining wall. Drainage here is improved and guaranteed from four aspects. The first is to drain the slope from the bottom of the matrix structure, the second is to use the seepage cage 9 extrusion water absorption structure, and the third is to plan an ecological drainage ditch above the matrix structure to organize surface runoff drainage. The drainage ditch is mainly natural pebbles, located at the edge of the overall bridge deck structure, forming a boundary buffer to reduce the risk of critical plant fall. Fourth, the bottom of the structure is connected to the existing municipal rainwater outlet through a customized rainwater well that can collect rainwater throughout the body, forming a complete and reliable drainage system. At the same time, the entire structure also incorporates a smart irrigation system to effectively save water and energy and reduce later maintenance costs.

[0048] Overpasses in the central urban areas of northern China are usually located in densely populated buildings with large passenger flow. Part of the bridge deck greening is located in the space where people pass through. While greening and beautifying, some temporary resting places can be formed for the passing people. When setting up rest facilities, the surrounding traffic conditions should be considered.

[0049] The greening of the bridge deck of the flyover needs to be combined with the construction requirements of the garden city at this stage. It is not enough to just cover it with green, but also to form a planting combination with multiple varieties and multiple levels to enrich the biodiversity of the city. Select plants suitable for the bridge area. More than 100 kinds of native plants are matched to reflect the plant characteristics of the bridge area to form a sustainable and low-maintenance under-bridge habitat garden. In spring, catalpa and roses are mainly seen, in summer there will be some summer flowers such as trumpet creepers, in autumn there are red maples, and in winter some evergreen tree species are planted, such as boxwood balls, privet balls, as well as euonymus balls, white pine, red yew, etc., to ensure the viewing effect of the four seasons in the north.

[0050] Working principle: First, the bridge deck damage is repaired to form a flat base. Then, a double-layer waterproof system is constructed using non-curing modified asphalt waterproof coating 8 and PVC waterproof membrane to ensure rainwater isolation and protect the underlying structure.

[0051] The first geotextile 4, the second geotextile and the drainage cage 9 are used to construct a drainage layer. The first geotextile 4 and the second geotextile prevent the soil from blocking the drainage channel, and the drainage cage 9 ensures that rainwater is discharged in time to avoid water accumulation.

[0052] Lay light soil as a water storage matrix, and then lay a mixed nutrient matrix on it to provide a suitable soil environment for plant growth. Finally, plant drought-resistant, cold-resistant and wind-resistant plants.

[0053] After the project is completed, regular watering, fertilization, weeding and pest control are required to ensure the healthy growth of the plants.

[0054] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A soil-covered greening system for the top of an old bridge, which is installed on an existing bridge deck (1), and comprises a cement mortar repair layer (2) at a damaged part, and is characterized by: The damaged cement mortar repair layer (2) is located on the upper surface of the existing slab bridge, and a waterproof roll material layer (3), a first geotextile (4), an aquifer (5), a lightweight soil layer (6) and a greening layer (7) are sequentially arranged on the upper surface of the damaged cement mortar repair layer (2) in a construction order from bottom to top.

2. The soil covering and greening of old bridge top according to claim 1 is characterized by: The waterproof coiled material layer (3) is a glass fiber reinforced PVC waterproof coiled material.

3. The soil covering and greening of the old bridge top according to claim 1 is characterized by: The cement mortar repair layer (2) at the damaged part and the waterproof roll material layer (3) are bonded together by a non-curing modified asphalt waterproof coating (8).

4. The soil covering and greening of old bridge top according to claim 1 is characterized by: During construction, two adjacent waterproof roll material layers (3) are overlapped by 150-200 mm to form a first overlap seam.

5. The soil covering and greening of the old bridge top according to claim 4 is characterized by: During construction, two adjacent first geotextiles (4) are overlapped by 150-200 mm to form a second overlap seam, and the first overlap seam and the second overlap seam are arranged in a staggered manner.

6. The soil covering and greening of old bridge top according to claim 1 is characterized by: A plurality of drainage cages (9) are arranged between the first geotextile (4) and the aquifer (5).

7. The soil covering and greening of old bridge top according to claim 6 is characterized by: The seepage drainage cages (9) are distributed in a grid shape.

8. The soil covering and greening of old bridge top according to claim 7 is characterized by: The outer surface of the drainage cage (9) is wrapped with a second geotextile.

9. The soil covering and greening of old bridge top according to claim 1 is characterized by: The light soil layer (6) is any one of light soil and peat soil, or a mixture thereof.

10. A construction method for covering the top of an old bridge with soil and greening, based on the construction method for covering the top of an old bridge with soil and greening according to any one of claims 1 to 9, characterized in that: The construction steps include: S1: Check the existing foundation bridge slab; Ensure that the base bridge deck is flat, firm, and free of cracks or obvious defects; if there are any problems, mark them with a marker pen; and clean the surface of the bridge deck to remove dust and debris; S2: Cement mortar repair; Using 1:2.5 cement mortar to repair the damaged parts marked on the existing bridge deck (1), and obtaining a cement mortar repair layer (2) at the damaged parts; thereby providing a flat and stable base for the subsequent covering greening layer (7); S3: laying of waterproof membrane layer (3); Apply a non-curing modified asphalt waterproof coating (8) to the upper surface of the cement mortar repair layer (2) at the damaged part; and lay a 1.5 mm thick glass fiber reinforced PVC waterproof membrane in accordance with the design requirements, with an overlap width of 150-200 mm, and bond with a suitable adhesive; seal the joints and edges of the membrane to prevent water leakage, so as to obtain a waterproof membrane layer (3); S4: laying of the first geotextile (4); Laying a first geotextile (4) on the waterproof roll material layer (3) with an overlap width of 150-200 mm; S5: Install the drainage cage (9); Wrapping the seepage cage (9) with the second geotextile to prevent soil particles from entering the drainage channel and affecting the drainage effect, then laying the seepage cage (9) with the second geotextile on the upper surface of the first geotextile (4), and arranging the seepage cage (9) in a 1m*1m grid to ensure smooth drainage; S6: laying of aquifer (5) and light soil layer (6); Evenly lay a 100 mm thick Po-LS light soil water storage matrix; pay attention to the thickness to be uniform, avoid being too thick or too thin in some places; and lay a light soil layer (6), the light soil layer (6) is a nutrient matrix mixed with light soil and peat soil; S7: Plant planting; Choose plant species suitable for roof greening, taking into account their drought resistance, cold resistance, and wind resistance, and plant plants according to design requirements, ensuring that the spacing between plants is appropriate to avoid affecting each other's growth; water them sufficiently after planting to ensure the survival of the plants; S8: Daily maintenance; Water according to weather conditions and plant growth, keeping the soil moist but not waterlogged; fertilize according to plant growth to supplement nutrients; then remove weeds regularly to prevent weeds from competing with plants for nutrients; and take timely prevention and control measures for pests and diseases when discovered.

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