Fixing method of roof greening module

Abstract

The present invention provides a method for fixing a roof greening module, comprising: calculating the total external force borne by the greening module, calculating the number of screws required for the greening module based on the total external force borne by the greening module, installing a corresponding number of screws on the bottom layer of the greening module, laying a waterproof roll on the bottom layer of the greening module, and the waterproof roll covers the nail cap of each screw, and the installation method of each screw is: the anchor bolt of the screw penetrates the bottom layer of the greening module and is fixed on the roof structure, an anti-slip pad is provided between the nail cap of the screw and the bottom layer of the greening module, and a sealant is used to fill the connection between the screw and the bottom layer of the greening module. This solution determines the number of screws and installs them according to the different external forces that the greening module is subjected to in different environments, reduces the safety hazards of the roof greening module, and ensures the stable operation of the roof greening system.

Description

Technical Field

[0001] The invention relates to the field of building greening, and in particular to a method for fixing a roof greening module. Background Art

[0002] With the acceleration of urbanization and the enhancement of environmental protection awareness, roof greening has been widely used as an important means to alleviate the urban heat island effect, improve air quality and enhance building energy conservation. However, roof greening systems are usually affected by external environments such as wind, rainfall, and snow. Especially in high-rise buildings or typhoon-prone areas, wind may lift or move greening modules, causing potential safety hazards.

[0003] Existing roof greening modules are usually placed directly on the roof for use. This method may be barely able to maintain normal climatic conditions, but it cannot effectively resist the impact of extreme climatic conditions such as strong winds, rain or snow. Under the influence of strong winds, the greening modules may be easily blown away. Excessive rainfall may cause the greening modules to loosen and shift, and the heavy pressure of snow may also cause the greening modules to lose stability.

[0004] In view of this, how to design a roof greening module fixing method that can resist various external forces has extremely important practical application value. It can not only ensure the stable operation of the roof greening system, but also provide strong guarantee for the improvement of the urban ecological environment and people's quality of life. Summary of the invention

[0005] The purpose of the present invention is to provide a method for fixing a roof greening module, by determining the number of screws and installing the screws according to the different external forces to which the greening module is subjected in different environments, thereby reducing the potential safety hazards of the roof greening module and ensuring the stable operation of the roof greening system.

[0006] To achieve the above objectives, the present technical solution provides a method for fixing a roof greening module, comprising:

[0007] Calculate the total external force borne by the greening module, calculate the number of screws required for the greening module based on the total external force borne by the greening module, install the corresponding number of screws on the bottom layer of the greening module, lay the waterproof membrane 1 on the bottom layer of the greening module, and the waterproof membrane 1 covers the nail cap of each screw. The installation method of each screw is as follows:

[0008] The anchor bolt 5 of the screw penetrates the bottom layer 4 of the greening module and is fixed on the roof structure. An anti-slip gasket 3 is arranged between the nail cap of the screw and the bottom layer 4 of the greening module, and a sealant 2 is used to fill the connection between the screw and the bottom layer of the greening module.

[0009] Furthermore, the total external force borne by each greening module is obtained by subtracting the friction force of each greening module itself from the environmental external force borne by each greening module.

[0010] Furthermore, the environmental external forces to which the greening module is subjected include wind load and earthquake load.

[0011] Furthermore, the bearing capacity of the screw is set to a first size, and the ratio of the total external force borne by the greening module to the first size is calculated by rounding to the nearest integer to obtain a first quantity, and the value of the first quantity plus one is used as the number of screws required for the greening module, wherein if the first quantity is less than 0, the first quantity is taken as 0.

[0012] Furthermore, the waterproof membrane 1 is laid at a set slope.

[0013] Furthermore, the contact portion between the edge of the bottom layer 4 of the greening module and the roof, and the contact portion between the edge of the waterproof membrane 1 and the bottom layer 4 of the greening module are sealed with a sealant 2 .

[0014] Further, when the number of screws required for the greening module is 1, the screws are installed at any corner of the bottom layer 4 of the greening module.

[0015] Furthermore, when the number of screws required for the greening module is 2, the screws are installed at both ends of any diagonal line of the bottom layer 4 of the greening module.

[0016] Further, when the number of screws required for the greening module is 3, three screws are arranged as vertices of a triangle in the bottom layer 4 of the greening module, preferably an equilateral triangle.

[0017] Further, when the number of screws required for the greening module is 4, one screw is arranged at each of the four corners of the bottom layer 4 of the greening module.

[0018] Compared with the prior art, this technical solution has the following characteristics and beneficial effects:

[0019] This solution determines the number of screws and installs them according to the different external forces that the roof greening module is subjected to in different environments, thereby reducing the safety hazards of the roof greening module and ensuring the stable operation of the roof greening system; when installing the screws, this solution provides an anti-skid gasket between the screw cap and the bottom layer of the greening module, which can effectively improve the stability of the greening module, especially under the action of wind and water flow, to prevent the greening module from shifting; this solution lays a waterproof membrane on the bottom layer of the greening module, and the waterproof membrane covers the nail cap of each screw, and lays the waterproof membrane at a certain slope to ensure that water flows smoothly and does not accumulate under the greening module; this solution uses sealant to seal the joints of the greening module, the waterproof membrane and the screws, effectively preventing moisture from penetrating into the roof structure, and preventing rainwater, snow, etc. from entering the gaps to cause internal corrosion or leakage. In addition, the sealant can also increase the fixing effect of the greening module, making it more stable BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the installation structure of the screws in the embodiment of the present application;

[0021] Figure 2 This is a schematic diagram of screw installation when the number of screws required for the greening module in the embodiment of the present application is 1;

[0022] Figure 3 is a schematic diagram of screw installation when the number of screws required for the greening module in the embodiment of the present application is 2;

[0023] Figure 4 is a schematic diagram of screw installation when the number of screws required for the greening module in the embodiment of the present application is 3;

[0024] Figure 5 is a schematic diagram of screw installation when the number of screws required for the greening module in the embodiment of the present application is 4;

[0025] In the figure: 1- waterproof membrane, 2- sealant, 3- anti-slip pad, 4- greening module base layer, 5- screw anchor bolt. DETAILED DESCRIPTION

[0026] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.

[0027] Those skilled in the art should understand that, in the disclosure of the present invention, the orientation or position relationship indicated by the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. are based on the orientation or position relationship shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the above terms should not be understood as limiting the present invention.

[0028] In order to facilitate the understanding of this scheme, the structure of the greening module used in this scheme is explained here:

[0029] The greening module is a rectangular structure with two layers. The top layer is used for planting plants, and the bottom layer is used for installation and fixation with the roof. There is a hollow structure between the top and bottom layers.

[0030] Embodiment 1

[0031] A method for fixing a roof greening module, which determines the number of screws and installs them according to the different external forces that the greening module is subjected to in different environments, reduces the potential safety hazards of the roof greening module, and ensures the stable operation of the roof greening system. For details, refer to Figure 1 , the method comprising:

[0032] Calculate the total external force borne by the greening module, calculate the number of screws required for the greening module based on the total external force borne by the greening module, install the corresponding number of screws on the bottom layer of the greening module, lay the waterproof membrane 1 on the bottom layer of the greening module, and the waterproof membrane 1 covers the nail cap of each screw. The installation method of each screw is as follows:

[0033] The anchor bolt 5 of the screw penetrates the bottom layer 4 of the greening module and is fixed on the roof structure. An anti-slip gasket 3 is arranged between the nail cap of the screw and the bottom layer 4 of the greening module, and a sealant 2 is used to fill the connection between the screw and the bottom layer of the greening module.

[0034] In some embodiments, the total external force borne by each greening module is obtained by subtracting the friction force of each greening module from the environmental external force borne by each greening module.

[0035] In some specific embodiments, the size of the greening module is 500 mm×500 mm×200 mm.

[0036] Specifically, the environmental external forces on the greening module include wind load and seismic load. The wind load refers to the pressure exerted by air flow on the engineering structure, and the wind load is related to the size of the greening module. The calculation formula of the wind load is as follows:

[0037]

[0038] Among them, F w is the wind load on the greening module, C p is the wind pressure coefficient, C g is the gust coefficient, which is used to consider the impact of gusts on wind load. The gust coefficient is usually related to the height of the greening module. s is the local body coefficient, which is used to reflect the influence of the location of the greening module on the wind load. ρ is the air density in kg / m 3 , air density is 1.225kg / m 3 , V is wind speed in m / s, A is windward area (m 3 ), that is, the effective area of ​​the greening module surface acted by wind.

[0039] Specifically, the wind load of the greening module is derived from the basic principles of aerodynamics, mainly based on the Bernoulli equation and the force of air flow on the surface of the greening module. The Bernoulli equation is one of the basic equations in fluid mechanics, which describes the energy conservation principle of incompressible fluids. In aerodynamics, the Bernoulli equation represents the balance between the static pressure, dynamic pressure and potential energy of the fluid (air). For low-speed air flow, ignoring the potential energy term, the Bernoulli equation can be written as:

[0040]

[0041] Where P is the static pressure of the fluid, that is, the pressure exerted by the wind on the surface of the greening module, and ρ is the air density, which is usually 1.225 kg / m 3 , V is the wind speed, the unit is m / s, P0 is the sum of dynamic pressure and static pressure, that is, when air flows over the surface of the greening module, the flow of air will generate kinetic energy, thereby reducing the static pressure and causing a pressure difference. This pressure difference will cause the surface of the greening module to bear a certain amount of force, so, is the dynamic pressure, and the formula is as follows:

[0042]

[0043] Wind pressure coefficient C p It is a dimensionless coefficient used to represent the pressure distribution of wind at different positions on the surface of greening modules. Greening modules of different shapes and different wind directions will lead to different wind pressure coefficients. The wind pressure coefficient is usually obtained through wind tunnel tests and actual measurements. The wind pressure coefficient represents the wind pressure increment relative to the dynamic pressure. The formula is as follows:

[0044] P=C p ·q

[0045] Where P is the actual pressure at a certain point on the surface of the greening module, C p is the wind pressure coefficient at that point, and q is the dynamic pressure.

[0046] The windward area A is the effective area of ​​the force generated by the wind on the surface of the greening module. The windward area of ​​the greening module is the top or side, so it can be deduced that the wind load F w It can be expressed as:

[0047] F w =P·A=C p ·q·A

[0048] In some specific embodiments, the wind load includes horizontal wind load and vertical wind load. If a greening module is in Hangzhou, Zhejiang, and the ground roughness is D, the height from the ground is 20m, the wind pressure coefficient is 0.51, the gust coefficient is 2.4, and the local shape coefficient is -0.9, then the horizontal wind load of the greening module is 49.57N and the vertical wind load is 123.93N.

[0049] In some embodiments, the magnitude of the seismic load is related to the deadweight of the greening module, which is the weight of the greening module itself plus the weight of the soil in the greening module plus the weight of the plants in the greening module.

[0050] The greening module is made of high-quality recycled polypropylene with a thickness of 10 mm and a density of 0.9 g / cm 3 , taking the size of the greening module as 500mm×500mm×200mm as an example, the weight of the greening module is calculated as follows:

[0051] The bottom area of ​​the greening module = 0.5m × 0.5m = 0.25m 2

[0052] The four-side area of ​​the greening module = 2×(0.5m×0.2m)+2×(0.5m×0.2m)=0.4m 2

[0053] Total surface area of ​​greening module = 0.25m 2 ×0.4m 2 =0.0065m 2

[0054] The volume of the greening module is obtained by multiplying the total surface area of ​​the greening module by its thickness:

[0055] Volume of greening module = 0.65m 2 ×0.01m=0.0065m 3

[0056] Then the weight of the greening module is the volume of the greening module multiplied by the density:

[0057] Weight of greening module = 0.0065m 3 ×900kg / m 3 =5.85kg

[0058] Furthermore, the volume of soil that can be contained in the greening module is calculated first, and then the weight of the soil in the greening module is obtained by multiplying the volume of the soil by the density of the soil. The formula is as follows:

[0059] Soil volume = 0.5m × 0.5m × 0.18m = 0.045m 3

[0060] Among them, 0.18m is the internal height of the greening module.

[0061] Soil weight = 0.045m 3 ×500kg / m 3 =22.5kg

[0062] Furthermore, the dry weight standard of green plants is set at 5kg / m 2 , then the weight formula of plants in the greening module is as follows:

[0063] Plant weight = 0.5m×0.5m×5kg / m 2 =1.25kg

[0064] The weight of the greening module is the weight of the greening module itself + the weight of the soil in the greening module + the weight of the plants in the greening module = 5.85kg + 22.5kg + 1.25kg = 29.6kg, that is, 29.6kg × 9.8m / s 2 =290.08N.

[0065] In some embodiments, the seismic load is formulated as follows:

[0066] F seismic =m×a seismic

[0067] Among them, F seismic is the earthquake force, the unit is N, m is the total weight of the greening module, a seismic is the earthquake acceleration, in m / s 2 .

[0068] In some specific embodiments, the horizontal earthquake force is relatively large, so the horizontal earthquake acceleration is set to 1.96 m / s 2 , then the formula for horizontal seismic force is:

[0069]

[0070] The vertical seismic force is relatively small, so the vertical seismic acceleration is set to 0.98m / s 2 , then the formula for vertical seismic force is expressed as:

[0071] F seismic，vert =29.6kg×0.98m / s 2 =29N

[0072] In some embodiments, the friction force of the greening module itself is the product of the friction coefficient and the weight of the greening module. The friction force calculation formula of the greening module itself is as follows:

[0073] Ff=μ·N

[0074] Among them, Ff is the friction force of the greening module itself, μ is the friction coefficient, which depends on the material properties between the greening module and the contact surface, N is the weight of the greening module itself, and N is 290.08N, then the friction force of the greening module itself is 145.04N.

[0075] Furthermore, the deadweight of the greening module is the sum of the weight of the greening module itself, the weight of the soil in the greening module, and the weight of the plants in the greening module.

[0076] In the step of "calculating the number of screws required for the greening module based on the total external force borne by the greening module", the bearing capacity of the screws is set to a first size, and the ratio of the total external force borne by the greening module to the first size is calculated by rounding up to the nearest integer to obtain a first number, and the value of the first number plus one is used as the number of screws required for the greening module, wherein if the first number is less than 0, the first number is taken as 0.

[0077] That is to say, if the total external force borne by the greening module is a positive value, it means that the friction force of the greening module is not enough to completely resist the horizontal external force of the greening module, so screws are needed to bear the remaining external force.

[0078] The screws used in this solution are steel screws. Based on the tensile strength of the material, the tensile strength of steel is 400MPa, and the diameter d of the screw is 5mm. The bearing capacity of each screw is:

[0079]

[0080] F tensile =400N / mm 2 ×19.63×10 -6 m 2 =7.85kN=7850N

[0081] Among them, A thread is the cross-sectional area of ​​the screw, and the bearing capacity of a screw is 7850N.

[0082] In this solution, in order to ensure the safety of the greening module, the ratio of the total external force borne by the greening module to the first size is calculated by rounding up. That is to say, if the friction force of the greening module itself can resist the total external force borne by the greening module, normally there is no need to use screws for fixing. However, for safety reasons, one screw is still used for fixing. If one screw can resist the total external force borne by the greening module, two screws are used for fixing, and so on.

[0083] For example, taking the greening module in Sanya, Hainan as an example, the horizontal wind load in Sanya, Hainan is 93.69N, the vertical wind load is 234.23N, the horizontal seismic load is 58N, and the vertical seismic load is 29N. The total horizontal external force it bears is the horizontal wind load plus the horizontal seismic load, which is expressed as follows:

[0084] F total，horiz =F wind,hori z+F seismic,horiz =93.69N+58N=151.69N

[0085] Among them, F total，horiz is the total horizontal external force borne by the greening module, F wind，horiz is the horizontal wind load, F seismic，horiz is the horizontal seismic load.

[0086] The total vertical external force borne by the greening module is the vertical wind load plus the vertical seismic load, which can be expressed as follows:

[0087] F total,vert =F wind，vert +F seismic,vert =234.23N+29N

[0088] =263.23N<290.08N(module weight)

[0089] Among them, F total，vert is the total vertical external force borne by the greening module, F wind，vert is the vertical wind load, F seismic，vert is the vertical seismic load.

[0090] In some specific embodiments, when the deadweight of the greening module is greater than the total vertical external force it is subjected to, the environmental external force applied to the greening module is only the total horizontal external force applied to the greening module; when the deadweight of the greening module is less than the total vertical external force applied to the greening module, the environmental external force applied to the greening module is the sum of the total horizontal external force applied to the greening module and the total vertical external force applied to the greening module.

[0091] At this time, the friction force of the greening module is 145.04N, which is not enough to resist the total horizontal external force borne by the greening module. Therefore, screws are needed to withstand the remaining horizontal external force 151.69N-145.04N=6.65N, so the first number is 1, and 2 screws are installed on the greening module.

[0092] In this solution, the anchor bolt 5 of the screw provides stability against wind, earthquake and sliding. The anchor bolt 5 is firmly connected to the roof structure by directly penetrating the roof protective layer to ensure that the greening module is not lifted or moved in strong winds or earthquakes.

[0093] Specifically, before using screws to fix the greening modules, clean the roof surface to ensure that the surface is flat and free of debris, and evaluate the bearing capacity of the roof. When using multiple screws, determine the distribution of the screws according to the building structure and design requirements so that the anchor points can evenly bear the load.

[0094] In this solution, the anti-skid pad 3 is arranged between the screw cap and the bottom layer 4 of the greening module. The function of the anti-skid pad 3 is to increase the friction force and further resist the horizontal sliding and vertical lifting of the greening module.

[0095] Specifically, the anti-skid pad 3 is usually made of a material with a high friction coefficient, such as rubber or a composite material, which can maintain its anti-skid performance under long-term environmental influences. The anti-skid pad 3 can effectively improve the stability of the greening module, especially under the action of wind and water flow, to prevent the greening module from shifting.

[0096] In this solution, the nail cap of each screw should be covered when the waterproof membrane 1 is laid to ensure that the waterproof effect of the roof is not damaged. The waterproof membrane 1 should not only have high waterproof performance, but also be durable to withstand long-term exposure to harsh outdoor environments, and the waterproof membrane 1 should be laid at a set slope.

[0097] Specifically, laying the waterproof membrane 1 at a set slope can ensure that water flows out smoothly and does not accumulate on the bottom layer 4 of the greening module, thereby preventing the roof structure from being damaged due to increased module load caused by accumulated water.

[0098] Furthermore, the laying of the waterproof membrane 1 should also ensure the smooth flow of drainage channels to prevent water from stagnating.

[0099] In this solution, the contact portion between the edge of the bottom layer 4 of the greening module and the roof, and the contact portion between the edge of the waterproof membrane 1 and the bottom layer 4 of the greening module are sealed with a sealant 2 .

[0100] Specifically, the sealant 2 is used to fix the joints between the bottom layer 4 of the greening module and the anchor bolts 5 of the screws and the waterproof membrane 1 to ensure the airtightness of the interface and prevent moisture from penetrating into the roof structure. At the same time, the use of the sealant 2 at the contact part between the edge of the bottom layer 4 of the greening module and the roof can also increase the fixing effect of the greening module and make it more stable.

[0101] Embodiment 2

[0102] In some specific embodiments, when the number of screws required for the greening module is 1, the screws are installed at any corner of the bottom layer 4 of the greening module.

[0103] Specifically, when there is only one screw, the position of the screw determines the stress condition of the greening container. The forces on the screw include wind load, seismic force and friction. At this time, the container will rotate around the screw, and the screw needs to follow the action of torque and external force. At this time, if the screw is arranged at the center position of the bottom layer 4 of the greening module, the screw cannot generate torque and cannot effectively resist the rotation effect. Therefore, the arrangement of a single screw at the center position of the lower layer 4 of the greening module is not the best choice.

[0104] When the screws are arranged at the corners of the bottom layer of the greening module, since the screws are at a greater distance from the point of application of the external force, a greater torque can be generated, so the rotation caused by the external force can be effectively resisted. Therefore, when the number of screws required for the greening module is 1, the screws can be installed at any corner of the bottom layer 4 of the greening module.

[0105] Furthermore, let d be the distance from the screw to the center of rotation, then the formula for the torque τ is:

[0106] τ=F horiz ×d

[0107] Among them, F horiz is the horizontal external force.

[0108] When the screw is arranged at the corner of the bottom layer 4 of the greening module, and the size of the bottom layer 4 of the greening module is L×W, the distance from the screw to the rotation center is Therefore, the torque of the screws arranged at the corner of the bottom layer 4 of the greening module is the largest, which can maximize the anti-rotation ability. The screw installation diagram when the number of screws required for the greening module is 1 is as follows: Figure 2 shown.

[0109] Embodiment 3

[0110] In some specific embodiments, when the number of screws required for the greening module is 2, the screws are installed at both ends of any diagonal line of the bottom layer 4 of the greening module.

[0111] When the number of screws required for the greening module is 2, the arrangement methods can be roughly divided into two types, one is diagonal arrangement and the other is adjacent arrangement.

[0112] When two screws are arranged diagonally, their lever arm is When two screws are arranged adjacent to each other, their force arm is d adi =min(L,M), obviously, d diag >d adi Therefore, arranging two screws diagonally can evenly disperse the external force, which is the best choice. The screw installation diagram when the number of screws required for the greening module is 2 is as follows Figure 3 shown.

[0113] Embodiment 4

[0114] In some specific embodiments, when the number of screws required for the greening module is 3, three screws are arranged in the bottom layer 4 of the greening module as vertices of a triangle, preferably an equilateral triangle.

[0115] Specifically, three screws are arranged as the vertices of a triangle so that each screw bears uniform external force and shares horizontal and vertical loads. The triangle is the most stable structure in geometry, which can maximize the resistance to external force and reduce stress concentration. At this time, the force borne by each screw is relatively small, and the triangular arrangement ensures the uniformity of the force arm and increases the overall torque resistance. The screw installation diagram when the number of screws required for the greening module is 3 is shown in the figure. Figure 4 shown.

[0116] Embodiment 5

[0117] In some specific embodiments, when the number of screws required for the greening module is 4, one screw is arranged at each of the four corners of the bottom layer 4 of the greening module.

[0118] Specifically, arranging a screw at each of the four corners of the bottom layer 4 of the greening module can minimize the force borne by each screw and can evenly resist the rotation effect. The even distribution of the four screws can provide the highest stability for the greening container and provide the greatest torque resistance. At the same time, the horizontal and vertical loads borne by the container are evenly dispersed to ensure that the greening module will not be displaced or turned over. The screw installation diagram when the number of screws required for the greening module is 3 is as follows: Figure 5 Shown

[0119] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0120] The present invention is not limited to the above-mentioned optimal implementation mode. Anyone can derive other various forms of products under the inspiration of the present invention. However, no matter what changes are made in the shape or structure, all technical solutions that are the same or similar to those of the present application fall within the protection scope of the present invention.

Claims

1. A method for fixing a roof greening module, characterized in that: include: The total external force borne by the greening module is calculated, and the number of screws required for the greening module is calculated based on the total external force borne by the greening module. The corresponding number of screws are installed on the bottom layer of the greening module. The waterproofing membrane (1) is laid on the bottom layer of the greening module, and the waterproofing membrane (1) covers the nail cap of each screw. The installation method of each screw is as follows: The anchor bolt (5) of the screw penetrates the bottom layer (4) of the greening module and is fixed on the roof structure. An anti-slip pad (3) is arranged between the screw cap and the bottom layer (4) of the greening module, and a sealant (2) is used to fill the connection between the screw and the bottom layer of the greening module.

2. A method for fixing a roof greening module according to claim 1, characterized in that: The total external force borne by each greening module is obtained by subtracting the friction force of the module itself from the environmental external force borne by the module.

3. A method for fixing a roof greening module according to claim 1, characterized in that: The external environmental forces on the greening module include wind load and earthquake load.

4. A method for fixing a roof greening module according to claim 1, characterized in that: In the step of "calculating the number of screws required for the greening module based on the total external force borne by the greening module", the bearing capacity of the screws is set to a first size, and the ratio of the total external force borne by the greening module to the first size is calculated by rounding up to the nearest integer to obtain a first number, and the value of the first number plus one is used as the number of screws required for the greening module, wherein if the first number is less than 0, the first number is taken as 0.

5. A method for fixing a roof greening module according to claim 2, characterized in that: The deadweight of the greening module is the sum of the weight of the greening module itself, the weight of the soil in the greening module, and the weight of the plants in the greening module.

6. A method for fixing a roof greening module according to claim 5, characterized in that: The contact portion between the edge of the bottom layer (4) of the greening module and the roof, and the contact portion between the edge of the waterproof roll material (1) and the bottom layer (4) of the greening module are sealed using a sealant (2).

7. A method for fixing a roof greening module according to claim 1, characterized in that: When the number of screws required for the greening module is 1, the screws are installed at any corner of the bottom layer (4) of the greening module.

8. The method for fixing a roof greening module according to claim 1, characterized in that: When the number of screws required for the greening module is 2, the screws are installed at both ends of any diagonal line of the bottom layer (4) of the greening module.

9. A method for fixing a roof greening module according to claim 1, characterized in that: When the number of screws required for the greening module is 3, three screws are arranged as vertices of a triangle in the bottom layer (4) of the greening module.

10. A method for fixing a roof greening module according to claim 1, characterized in that: When the number of screws required for the greening module is 4, one screw is arranged at each of the four corners of the bottom layer (4) of the greening module.

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