Prefabricated green building roof and construction method thereof

Abstract

This application relates to the technical field of prefabricated green roofs, and in particular to a prefabricated green building roof and its construction method. The roof includes a ridge structure comprising a frame, a rain shield, and a waterproof layer. The frame and waterproof layer are fixedly connected by fasteners. The rain shield is located on the side of the waterproof layer away from the frame. A support connects the frame and the rain shield, with one end of the support fixedly connected to the frame by fasteners, and the other end of the support passing through the waterproof layer and engaging with the rain shield. A planting structure includes a planting box, a soil layer, and a drainage pipe. A partition is fixedly installed inside the planting box, dividing it into an upper planting chamber and a lower water storage chamber. The soil layer is located within the planting chamber. A water collection trough is fixedly installed at one end of the rain shield, and one end of the drainage pipe connects to the water collection trough, while the other end connects to the water storage chamber. This application improves the growth environment for rooftop plants.

Description

Technical Field

[0001] This application relates to the technical field of prefabricated green roofs, and in particular to a prefabricated green building roof and its construction method. Background Technology

[0002] Prefabricated green building roofs are a new type of building roof structure. Their main feature is the use of readily available modular green plants, which are assembled and installed through a pre-designed system to form a green roof that integrates landscape, environmental protection, and energy conservation.

[0003] To ensure plant growth, the roof is equipped with appropriate drainage and edge protection facilities to guarantee the stability and integrity of the entire roof system. However, due to their unique growing environment, rooftop plants are difficult to water and need to passively adapt to climatic conditions, which is detrimental to their growth. Summary of the Invention

[0004] To improve the growth environment for rooftop plants, this application provides a prefabricated green building roof and its construction method.

[0005] On the one hand, the prefabricated green building roof provided in this application adopts the following technical solution: A prefabricated green building roof includes a ridge structure, the ridge structure including a frame, a rain shield and a waterproof layer, the frame and the waterproof layer being fixedly connected by fasteners, the rain shield being located on the side of the waterproof layer away from the frame, a support connecting the frame and the rain shield, one end of the support being fixedly connected to the frame by fasteners, and the other end of the support passing through the waterproof layer and engaging with the rain shield. The planting structure includes a planting box, a soil layer, and a drainage pipe. A partition is fixedly installed inside the planting box, dividing the planting box into an upper planting cavity and a lower water storage cavity. The soil layer is located inside the planting cavity. A water collection trough is fixedly installed at one end of the rainproof plate. One end of the drainage pipe is connected to the water collection trough, and the other end of the drainage pipe is connected to the water storage cavity.

[0006] By adopting the above technical solutions, the keel frame can bear the weight of the rain shield and waterproof layer, effectively transferring the load to the roof and ensuring the stability of the entire roof ridge. The rain shield can isolate rainwater and also beautify the building's appearance, while the waterproof layer further waterproofs and prevents moisture, improving indoor comfort. The partitions inside the planting box can isolate water and soil, and the soil layer providing a growing environment for the plants is located in the planting cavity, while the water is in the water storage cavity, thus ensuring a good growing environment for the plants. The water in the water storage cavity flows from the rainwater on the rain shield into the water collection trough, and then into the water storage cavity through the drain pipe. The water storage cavity can store rainwater, ensuring that the plants have a certain water source for their growth.

[0007] Optionally, the partition is fixedly provided with a water-absorbing cylinder, which is located in the water storage cavity. The surface of the water-absorbing cylinder is provided with a water inlet hole. A filter cloth and a sand and gravel layer are also provided between the soil layer and the partition. The filter cloth is attached to the surface of the partition and the inner circumferential side wall of the water-absorbing cylinder, and the sand and gravel layer is filled in the water-absorbing cylinder.

[0008] By adopting the above technical solution, the water in the water storage chamber enters the water suction cylinder through the water inlet. The filter cloth in the water suction cylinder can not only prevent soil from entering the water storage chamber, but also effectively draw water into the sand and gravel layer. The sand and gravel layer is composed of sand and gravel with large gaps, which can effectively absorb and store water, thereby ensuring that the soil layer has a sufficient water source.

[0009] Optionally, the planting structure further includes a regulating component for controlling the water inlet of the water storage chamber. The regulating component includes a filter screen, a float plate, and a sealing component. The drain pipe is connected to a fixed cylinder. The filter screen is fixedly connected inside the fixed cylinder. The float plate is located inside the water storage chamber. One end of the sealing component is rotatably connected to the float plate, and the other end of the sealing component passes through the filter screen and is slidably connected to the filter screen.

[0010] By adopting the above technical solution, the collected rainwater contains a large number of impurities. If these impurities flow directly into the storage chamber through the drain pipe, they will settle and accumulate in the storage chamber, thus affecting the water storage capacity. Therefore, it is necessary to filter the rainwater to reduce the amount of impurities entering the storage chamber. The control component can control the amount of rainwater entering the storage chamber and filter the impurities in the rainwater, thereby reducing the amount of impurities in the water in the storage chamber. Rainwater enters the fixed cylinder through the drain pipe, and then the impurities in the rainwater are filtered through the filter screen before entering the storage chamber. The float is made of a material with high buoyancy. As the water in the storage chamber increases, the buoyancy of the water continuously lifts the float and raises it. The float drives the sealing component to rise synchronously. When the storage chamber is full of water, the sealing component blocks the filter screen, preventing rainwater from entering the storage chamber. The combination of the float plate and the sealing component can control the amount of rainwater entering the water storage chamber. If the water storage chamber is full of water and the filter screen is not sealed, a small amount of small impurities will still accumulate in the water storage chamber. Therefore, the sealing component needs to seal the filter screen in time. When the water in the water storage chamber gradually decreases, the sealing component will also lose its blocking effect on the filter screen due to the descent of the float plate.

[0011] Optionally, the sealing component is fixedly provided with a sealing head, the sealing head is located inside the filter screen, a turbine is provided at the end of the sealing head away from the float plate, and the sealing head is also fixedly provided with a spiral blade.

[0012] By adopting the above technical solution, the filter screen can easily accumulate impurities after long-term filtration, which affects the filtration and water permeability of the filter screen. However, the turbine on the sealing head can rotate, making it difficult for impurities in the filter screen to settle and accumulate. When rainwater passes through the turbine and spiral blades, the rainwater impacts the turbine and spiral blades to rotate, so that the entire sealing component is in a rotating state, which fully stirs the impurities in the filter screen and reduces the accumulation of impurities in the filter screen.

[0013] Optionally, an overflow pipe is provided between the planting box and the drainage pipe, and the overflow pipe is located at the top of the water storage cavity.

[0014] By adopting the above technical solution, when rainfall is excessive and prolonged, the water storage chamber is quickly filled with water. Rainwater gradually seeps into the storage chamber through the soil layer, sand layer, and filter cloth. However, if the storage chamber is saturated, it cannot hold too much rainwater, and excessive moisture in the soil layer will affect plant growth. When the water in the storage chamber is too much, the overflow pipe can drain the water into the drainage pipe, thus allowing the storage chamber to hold more rainwater seeping into the planting chamber, providing a suitable growing environment for the plants.

[0015] Optionally, the keel frame includes a support frame, a main beam, secondary beams, and diagonal braces. The support frame is vertically arranged, and the top of the support frame is fixedly connected to the secondary beams by fasteners. Multiple secondary beams are located below the main beams and arranged parallel to the main beams. The diagonal braces are located on the side of the secondary beams away from the support frame and are fixedly connected to the secondary beams by fasteners. Two sets of diagonal braces are symmetrically arranged on both sides of the main beams. Multiple diagonal braces are distributed in each set along the length of the main beams, and each diagonal brace is fixedly connected to the main beams by fasteners.

[0016] By adopting the above technical solution, the support frame is responsible for bearing the overall vertical load of the ridge. The bottom of the support frame connects to the roof, thus transferring the vertical load to the roof. The main beam connects the diagonal braces, improving the overall integrity of the ridge and making the keel frame more stable, capable of withstanding greater loads. The secondary beams are intermediate structures connecting the support frame and the diagonal braces, transferring the load borne by multiple diagonal braces to the support frame. The diagonal braces are densely distributed along the ridge, and their numerous number connect to the waterproof layer and rain shield, increasing the structural stability. The support frame, main beams, secondary beams, and diagonal braces are fixed together with fasteners, facilitating initial assembly and subsequent disassembly, thus accelerating construction efficiency.

[0017] Optionally, an insulation layer is provided between the diagonal brace and the waterproof layer.

[0018] By adopting the above technical solution, the insulation layer can effectively reduce indoor and outdoor temperature conduction and convection. The insulation layer is made of polystyrene board, which has excellent thermal insulation and moisture-proof performance.

[0019] Optionally, the ridge structure also includes a roof located above the main beam, the roof being fixedly connected to the main beam, and the roof being fixedly connected to the rain shield by fasteners.

[0020] By adopting the above technical solutions, the roof can cover the main beam, reducing rainwater from entering the ridge through the top of the main beam. The roof can also strengthen the connection of the rain shields, making the overall integrity of the multiple rain shields better.

[0021] Optionally, multiple rain shields are provided along the length of the main beam, and multiple supports are provided, each corresponding to a rain shield. Each support is provided with a protrusion. A first connecting portion and a second connecting portion are provided on both sides of the rain shield along the length of the main beam. The first connecting portion is wrapped around the protrusion, and the second connecting portion is wrapped around the first connecting portion of the adjacent rain shield, so that the adjacent rain shields can be interlocked.

[0022] By adopting the above technical solution, the support can tightly connect adjacent rain shields together through the first connecting part and the second connecting part, which not only increases the integrity between multiple rain shields, but also allows the rain shields to be directly connected to the keel frame, increasing the stability of the rain shields.

[0023] On the other hand, the construction method for a prefabricated green building roof provided in this application adopts the following technical solution, including the following steps: S1, Secure the bottom of the support frame to the roof using fasteners; S2, fix the secondary beam to the support frame with fasteners, then fix the support and diagonal brace on the secondary beam, and fix the diagonal brace to the main beam; S3, lay the insulation layer and waterproof layer on the diagonal brace. During the laying process, the support passes through the insulation layer and waterproof layer. Then the rain shield is snapped into the support. Fix the water collection trough at the end of the rain shield away from the main beam. Fix and connect the drain pipe to the water collection trough. S4. Fix the planting box to the roof, connect the control component to the drain pipe, extend the drain pipe into the water storage chamber, lay the filter cloth on the partition, and then add the sand and gravel layer and the soil layer in sequence on the filter cloth. Plant the plants in the soil layer.

[0024] In summary, this application includes at least one of the following beneficial technical effects: 1. The support frame, main beam, secondary beam and diagonal brace form a stable keel frame, which can ensure the stability of the entire ridge. The support can connect the rain shield and the keel frame together, which increases the stability of the rain shield. 2. Water in the water storage chamber will enter the sand and gravel layer through the water suction tube and filter cloth, and then be absorbed by the plants in the soil layer. When the rain is heavy and continuous, rainwater can also enter the water storage chamber through the soil layer, sand and gravel layer and water suction tube, thus providing good growing conditions for plants. Excess water in the water storage chamber will also be discharged through the overflow pipe. 3. The partitions of the planting box form planting chambers and water storage chambers according to different functions. The control component in the water storage chamber can control the amount of rainwater entering the water storage chamber. When the water storage chamber is saturated with rainwater, the float rises to block the filter screen. In addition, the rainwater can impact the turbine and spiral blades, causing the blocking component to rotate, thereby reducing the accumulation of impurities in the filter screen. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application; Figure 2 This is a schematic diagram of the internal structure of the roof ridge structure according to an embodiment of this application; Figure 3 This is a schematic diagram of the keel frame and support according to an embodiment of this application; Figure 4 This is an embodiment of the present application. Figure 1 A cross-sectional schematic diagram of AA; Figure 5 This is an embodiment of the present application. Figure 1 A cross-sectional view of BB; Figure 6 This is a schematic diagram of the planting structure according to an embodiment of this application; Figure 7 This application Figure 5 Enlarged view of part C; Figure 8 This is a schematic diagram of the structure of the control component in an embodiment of this application.

[0026] Explanation of reference numerals in the attached drawings: 1. Ridge structure; 11. Keel frame; 111. Main beam; 1111. Roof cover; 112. Support frame; 113. Secondary beam; 114. Diagonal brace; 12. Insulation layer; 13. Support; 131. Protrusion; 14. Waterproof layer; 15. Rain shield; 151. First connection part; 152. Second connection part; 153. Water collection trough; 2. Planting structure; 21. Planting box; 211. Partition; 212. Planting cavity; 213. Water storage. 214. Water suction cylinder; 2141. Water inlet; 215. Overflow pipe; 22. Filter cloth; 23. Sand and gravel layer; 24. Soil layer; 25. Drainage pipe; 251. First connecting pipe; 252. Second connecting pipe; 253. Fixed cylinder; 254. Adapter; 26. Control component; 261. Filter screen; 262. Float plate; 263. Sealing component; 2631. Sealing head; 2632. Rotating rod; 2633. Turbine; 2634. Spiral blade. Detailed Implementation

[0027] In the description of this application, it should be understood that the terms "upper", "lower", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0028] The following is in conjunction with the appendix Figure 1 - Appendix Figure 8 This application will be described in further detail.

[0029] This application discloses a prefabricated green building roof, referring to... Figure 1 and Figure 2 It includes a ridge structure 1 and a planting structure 2. The ridge structure 1 can provide waterproofing, heat preservation and heat insulation for the roof, while the planting structure 2 can provide a good growing environment for plants. The planting structure 2 is set in two sets and is located on both sides of the ridge structure 1.

[0030] Reference Figure 1 and Figure 2 The ridge structure 1 consists of two symmetrically arranged sets, each set sloping downwards from the closer end to the more distant end. The ridge structure 1 includes a frame 11, an insulation layer 12, supports 13, a waterproof layer 14, and a rain shield 15. The frame 11 provides support for the ridge. The insulation layer 12, waterproof layer 14, and rain shield 15 are laid on one side of the frame 11. One end of the support 13 is fixed to the frame 11, and the other end passes through the insulation layer 12 and waterproof layer 14 before engaging with the rain shield 15. The insulation layer 12 and waterproof layer 14 are laid around the ridge, forming a sealed structure.

[0031] Reference Figure 2 and Figure 3The keel frame 11 includes a main beam 111, a support frame 112, a secondary beam 113, and a diagonal brace 114. The main beam 111 is a steel plate with a trapezoidal cross-section. The main beam 111 is located between two sets of ridge structures 1. The main beam 111 is the same length as the entire ridge structure 1. The waterproof layer 14 and the rain shield 15 both abut against the main beam 111. The main beam 111 is filled with thermal insulation material. A top cover 1111 is also provided above the main beam 111. The top cover 1111 covers the gap of the main beam 111. The top cover 1111 is snapped into the rain shield 15, and the connection between the top cover 1111 and the rain shield 15 is fixed by fasteners. The support frame 112 is made of high-strength H-beams. Multiple sets of support plates are vertically spaced along the length of the main beam 111. Each set of support frames 112 contains two beams and is spaced apart along the inclined direction of the rain shield 15. The bottom of the support frame 112 is fixedly connected to the roof with fasteners, and the top of the support frame 112 is fixedly connected to the secondary beam 113 with fasteners. Multiple secondary beams 113 are located below the main beam 111 and are arranged parallel to the main beam 111. The cross-sections of the secondary beams 113 and the diagonal braces 114 are both Z-shaped. The length direction of the secondary beams 113 is perpendicular to the length direction of the diagonal braces 114. The diagonal braces 114 are fixedly connected to the secondary beams 113 with fasteners. Multiple diagonal braces 114 are spaced apart along the length direction of the secondary beams 113. The diagonal braces 114 abut against the main beam 111 and are fixedly connected with fasteners. The diagonal braces 114 gradually slope downward from the direction closer to the main beam 111 to the direction farther away from the main beam 111.

[0032] Reference Figure 2 and Figure 4 The insulation layer 12 is made of polystyrene board, which is made of polystyrene foam and has excellent thermal insulation and moisture-proof properties. An arc-shaped protrusion 131 is provided at the end of the support 13 furthest from the secondary beam 113. Multiple rain shields 15 are provided along the length of the main beam 111, and the supports 13 have multiple rain shields 15, each corresponding to a different rain shield 15. A first connecting part 151 and a second connecting part 152 are respectively provided on both sides of the rain shield 15 along the length of the main beam 111. The first connecting part 151 wraps around the protrusion 131, and the second connecting part 152 wraps around the first connecting part 151 of the adjacent rain shield 15. Adjacent rain shields 15 are interlocked by the first connecting part 151 and the second connecting part 152. The waterproof layer 14 is made of polyvinyl chloride board, which has good waterproof performance, good weather resistance and corrosion resistance, and is lightweight and easy to process on-site.

[0033] Reference Figure 5 and Figure 6The planting structure 2 includes a planting box 21, a filter cloth 22, a sand and gravel layer 23, a soil layer 24, and a drainage pipe 25. A partition 211 is fixedly installed inside the planting box 21, dividing it into an upper planting cavity 212 and a lower water storage cavity 213. The planting cavity 212 accommodates the sand and gravel layer 23 and the soil layer 24, while the water storage cavity 213 accommodates water. A water suction cylinder 214 is fixedly installed on the partition 211. The water suction cylinder 214 is hollow and extends into the water storage cavity 213, with evenly spaced water inlet holes 2141 on its surface. The filter cloth 22 can be geotextile, possessing good permeability and effectively isolating soil, reducing soil entry into the water storage cavity 213. The filter cloth 22 is laid inside the partition 211 and the water suction cylinder 214, the sand and gravel layer 23 is laid on the surface of the filter cloth 22, and then the soil layer 24 is laid on the surface of the sand and gravel layer 23.

[0034] Reference Figure 5 and Figure 7 A water collection trough 153 is fixedly installed at the end of the rain shield 15 away from the main beam 111. The water collection trough 153 is connected to the drain pipe 25. The drain pipe 25 includes a first connecting pipe 251, a second connecting pipe 252, a fixed cylinder 253, and an adapter 254. The first connecting pipe 251, the second connecting pipe 252, and the fixed cylinder 253 are connected through the adapter 254. The first connecting pipe 251 is connected to the water collection trough 153, the fixed cylinder 253 is connected to the water storage chamber 213, and the second connecting pipe 252 is used to discharge rainwater. The planting box 21 is also fixedly installed with an overflow pipe 215. One end of the overflow pipe 215 is connected to the top of the water storage chamber 213, and the other end of the overflow pipe 215 is connected to the second connecting pipe 252.

[0035] Reference Figure 7 and Figure 8 The planting structure 2 also includes a control component 26, which is installed inside a fixed cylinder 253. The control component 26 includes a filter screen 261, a float plate 262, and a sealing element 263. The fixed cylinder 253 is threadedly connected to an adapter 254. The filter screen 261 is fixedly connected inside the fixed cylinder 253 and is a cylindrical shape with an opening at the top and densely distributed filter holes on its surface. The sealing element 263 includes a sealing head 2631 and a rotating rod 2632. The sealing head 2631 is located inside the filter screen 261, and the rotating rod 2632 is fixedly connected to the sealing head 2631. A turbine 2633 is fixedly installed at the end of the sealing head 2631 away from the rotating rod 2632, and a helical blade 2634 is fixedly installed on the rotating rod 2632. The rotating rod 2632 is rotatably connected to the float 262, and the rotating rod 2632 and the float 262 are limited by fasteners so that the float 262 and the rotating rod 2632 can move synchronously along the length of the rotating rod 2632. The float 262 is made of a material with low density and high buoyancy, such as polyethylene foam board.

[0036] The implementation principle of this embodiment is as follows: The ridge structure 1 consists of a support frame 112, main beam 111, secondary beam 113, and diagonal braces 114, forming a stable keel frame 11 that ensures the stability of the entire ridge. The secondary beam 113 and the rain shield 15 are connected by supports 13, which pass through the insulation layer 12 and the waterproof layer 14. The supports 13 not only increase the stability of the rain shield 15 but also enhance the overall integrity of the ridge structure 1. The insulation layer 12 provides thermal insulation, while the waterproof layer 14 isolates external rainwater, increasing the waterproof performance of the ridge structure 1.

[0037] Planting Structure 2: Rainwater is collected in the collection trough 153 and flows into the drain pipe 25, then into the storage chamber 213 through the fixed cylinder 253. When the rainwater passes through the filter screen 261, impurities in the water are filtered out. When the water flows through the spiral blades 2634, it drives the rotating rod 2632 to rotate, that is, the turbine 2633 rotates, making it difficult for impurities in the filter screen 261 to settle and clog the filter holes. As the rainwater in the storage chamber 213 continues to increase, the buoyancy of the water causes the float plate 262 to rise. The float plate 262, through the rotating rod 2632, causes the sealing head 2631 to gradually extend out of the filter screen 261, thereby clogging the fixed cylinder 253. The rainwater is discharged directly into the second connecting pipe 252 through the first connecting pipe 251, without storing water in the storage chamber 213. The rainwater directly washes the turbine 2633, and can also remove impurities from the surface of the turbine 2633 for reuse.

[0038] This application discloses a construction method for a prefabricated green building roof, including the following steps: S1, Secure the bottom of the support frame 112 to the roof using fasteners; S2, fix the secondary beam 113 to the support frame 112 with fasteners, and then fix the support 13 and the diagonal brace 114 on the secondary beam 113; S3, lay the insulation layer 12 and waterproof layer 14 on the diagonal brace 114. During the laying process, the support 13 passes through the insulation layer 12 and waterproof layer 14. Then the rainproof plate 15 is snapped into the support 13. The water collection trough 153 is fixed at the end of the rainproof plate 15 away from the main beam 111. The drain pipe 25 is fixed and connected to the water collection trough 153. S4, fix the planting box 21 to the roof, connect the control component 26 to the drain pipe 25, and extend the drain pipe 25 into the water storage chamber 213. S5, a filter cloth 22 is laid on the partition 211, and then a sand and gravel layer 23 and a soil layer 24 are added on the filter cloth 22 in sequence, and plants are planted in the soil layer 24.

[0039] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A fabricated green building roof, characterized in that: The roof includes a ridge structure (1), which includes a keel frame (11), a rain shield (15) and a waterproof layer (14). The keel frame (11) and the waterproof layer (14) are fixedly connected by fasteners. The rain shield (15) is located on the side of the waterproof layer (14) away from the keel frame (11). A support (13) is connected between the keel frame (11) and the rain shield (15). One end of the support (13) is fixedly connected to the keel frame (11) by fasteners, and the other end of the support (13) passes through the waterproof layer (14) and is snapped into the rain shield (15). The planting structure (2) includes a planting box (21), a soil layer (24), and a drainage pipe (25). The planting box (21) is fixedly equipped with a partition (211), which divides the planting box (21) into an upper planting cavity (212) and a lower water storage cavity (213). The soil layer (24) is located inside the planting cavity (212). A water collection trough (153) is fixedly installed at one end of the rain shield (15). One end of the drainage pipe (25) is connected to the water collection trough (153), and the other end of the drainage pipe (25) is connected to the water storage cavity (213). The planting structure (2) also includes a regulating component (26) for controlling the water inlet of the water storage chamber (213). The regulating component (26) includes a filter screen (261), a float plate (262), and a sealing component (263). The drain pipe (25) is connected to a fixed cylinder (253). The filter screen (261) is fixedly connected inside the fixed cylinder (253). The float plate (262) is located inside the water storage chamber (213). One end of the sealing component (263) is rotatably connected to the float plate (262), and the other end of the sealing component (263) passes through the filter screen (261) and is slidably connected to the filter screen (261). The sealing component (263) includes a sealing head ( The filter screen (261) and the rotating rod (2632) are connected. The plugging head (2631) is located inside the filter screen (261). The rotating rod (2632) is fixedly connected to the plugging head (2631). A turbine (2633) is fixedly provided at the end of the plugging head (2631) away from the rotating rod (2632). The rotating rod (2632) is fixedly provided with a spiral blade (2634). The rotating rod (2632) is rotatably connected to the float plate (262). The rotating rod (2632) and the float plate (262) are limited by fasteners so that the float plate (262) and the rotating rod (2632) move synchronously along the length direction of the rotating rod (2632).

2. The assembled green building roof according to claim 1, characterized in that: The partition (211) is fixedly provided with a water suction cylinder (214), which is located in the water storage cavity (213). The surface of the water suction cylinder (214) is provided with a water inlet hole (2141). A filter cloth (22) and a sand and gravel layer (23) are also provided between the soil layer (24) and the partition (211). The filter cloth (22) is attached to the surface of the partition (211) and the inner circumferential side wall of the water suction cylinder (214). The sand and gravel layer (23) is filled in the water suction cylinder (214).

3. The assembled green building roof according to claim 1, characterized in that: An overflow pipe (215) is provided between the planting box (21) and the drainage pipe (25), and the overflow pipe (215) is located at the top of the water storage chamber (213).

4. The assembled green building roof according to claim 2, characterized in that: The keel frame (11) includes a support frame (112), a main beam (111), a secondary beam (113), and diagonal braces (114). The secondary beams (113) are located below the main beam (111) and are arranged in multiple parallel to the main beam (111). The support frame (112) is vertically arranged, and the top of the support frame (112) is fixedly connected to the secondary beam (113) by fasteners. The diagonal braces (114) are located on the side of the secondary beam (113) away from the support frame (112). The diagonal braces (114) are fixedly connected to the secondary beam (113) by fasteners. Two sets of diagonal braces (114) are symmetrically arranged on both sides of the main beam (111). Each set of diagonal braces (114) has multiple diagonal braces (114) distributed at intervals along the length direction of the main beam (111). Each diagonal brace (114) is fixedly connected to the main beam (111) by fasteners.

5. The assembled green building roof according to claim 4, characterized in that: An insulation layer (12) is provided between the diagonal brace (114) and the waterproof layer (14).

6. A prefabricated green building roof according to claim 4, characterized in that: The ridge structure (1) also includes a top cover (1111) located above the main beam (111), the top cover (1111) being fixedly connected to the main beam (111), and the top cover (1111) being fixedly connected to the rain shield (15) by fasteners.

7. The assembled green building roof according to claim 5, characterized in that: Multiple rain shields (15) are provided along the length of the main beam (111). Multiple supports (13) are provided and correspond one-to-one with the rain shields (15). Each support (13) is provided with a protrusion (131). Each rain shield (15) is provided with a first connecting part (151) and a second connecting part (152) on both sides along the length of the main beam (111). The first connecting part (151) is wrapped around the protrusion (131), and the second connecting part (152) is wrapped around the first connecting part (151) of the adjacent rain shield (15), so that the adjacent rain shields (15) can be interlocked.

8. A construction method of a fabricated green building roof using the fabricated green building roof according to claim 7, characterized in that: Includes the following steps: S1, fix the bottom of the support frame (112) to the roof with fasteners; S2, fix the secondary beam (113) to the support frame (112) with fasteners, then fix the support (13) and diagonal brace (114) on the secondary beam (113), and fix the diagonal brace (114) to the main beam (111); S3, lay the insulation layer (12) and waterproof layer (14) on the diagonal brace (114), during the laying process, the support (13) passes through the insulation layer (12) and waterproof layer (14), then snap the rain shield (15) to the support (13), fix the water collection trough (153) at the end of the rain shield (15) away from the main beam (111), and fix and connect the drain pipe (25) to the water collection trough (153); S4, fix the planting box (21) on the roof, connect the control component (26) to the drain pipe (25), extend the drain pipe (25) into the water storage chamber (213), lay the filter cloth (22) on the partition (211), and then add the sand and gravel layer (23) and the soil layer (24) on the filter cloth (22) in sequence, and plant the plants in the soil layer (24).

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