Roof and manufacturing method thereof

Abstract

The invention belongs to the technical field of roof buildings, and particularly relates to a roof and a manufacturing method thereof. The roof comprises a base layer panel which is a reinforced concrete plate or a steel plate; the reinforcement cages are fixedly connected with the upper surface of the base layer panel and are arranged at intervals; the hollow plastic balls are located in the reinforcement cages, the polyurethane foaming agent layer is connected with the base layer panel, and the polyurethane foaming agent layer completely covers the reinforcement cages and the hollow plastic balls located in the reinforcement cages. Wherein the top end of the hollow plastic ball is communicated with a water inlet pipe penetrating out of the polyurethane foaming agent layer, and the bottom end of the hollow plastic ball is communicated with a water outlet pipe penetrating through the base layer panel. The roof and the manufacturing method thereof are lower in manufacturing cost and more environmentally friendly.

Description

Technical Field

[0001] The invention relates to the technical field of roof construction, and in particular to a roof and a manufacturing method thereof. Background Art

[0002] At present, existing roofs usually directly make insulation layers, waterproof layers and protective layers on cast-in-place concrete slabs. Among them, the production of concrete slabs requires a large amount of concrete. On the one hand, the use of a large amount of concrete (mainly cement) will produce more carbon dioxide, which will not only cause certain damage to human health, but also become one of the main factors leading to global warming; on the other hand, the use of a large amount of concrete also increases the load on the roof. Long-term use is prone to the risk of house subsidence and cracking, and the probability of people being crushed to death when an earthquake occurs is also greater; in addition, the concrete slab itself has poor sound insulation performance and is easily affected by noise pollution; in addition, existing roofs need to make a very thick insulation layer on the concrete slab for thermal insulation, so the required amount of thermal insulation materials is high, resulting in increased roof production costs. Summary of the invention

[0003] In view of the shortcomings of the prior art, the present invention proposes a roof with lower manufacturing cost and more environmental protection and a manufacturing method thereof.

[0004] The roof according to the present invention comprises: a base panel, which is a reinforced concrete panel or a steel plate; a plurality of steel cages arranged at intervals and fixedly connected to the upper surface of the base panel; hollow plastic balls located in the steel cages, and a polyurethane foaming agent layer connected to the base panel, the polyurethane foaming agent layer completely covering each steel cage and the hollow plastic balls located therein. The top end of the hollow plastic ball is connected to a water inlet pipe passing through the polyurethane foaming agent layer, and the bottom end of the hollow plastic ball is connected to a water outlet pipe passing through the base panel.

[0005] Furthermore, the steel cage includes a bottom horizontal steel plate fixedly connected to the upper surface of the base panel, a top horizontal steel plate located above the bottom horizontal steel plate, and a vertical steel plate connecting the bottom horizontal steel plate and the top horizontal steel plate. The bottom horizontal steel plate, the top horizontal steel plate and the vertical steel plate together form a space for accommodating and clamping the hollow plastic balls.

[0006] Furthermore, a plurality of first longitudinal steel bars are arranged at intervals along the lateral direction of the upper surface of the base panel, and a plurality of first transverse steel bars are arranged at intervals along the longitudinal direction, so that each first longitudinal steel bar and each first transverse steel bar are arranged in a mesh to form a plurality of first grids, and the bottom horizontal steel bar plate is formed by a plurality of first grids; a plurality of second longitudinal steel bars are arranged at intervals along the lateral direction above the upper surface of the base panel, and a plurality of second transverse steel bars are arranged in a mesh to form a plurality of second grids, and the top horizontal steel bar plate is formed by at least one second grid; the vertical steel bar plate includes at least two vertical steel bars, the vertical steel bars are connected between the first grid and the second grid, and the at least two vertical steel bars are respectively located on opposite sides of the bottom horizontal steel bar plate, and the hollow plastic ball is accommodated and clamped in a space formed by a plurality of first grids, at least one second grid and at least two vertical steel bars.

[0007] Furthermore, the hollow plastic ball is used to be filled with heat-insulating gas, the water inlet pipe and the water outlet pipe are both closed, and the heat-insulating gas includes at least one of air, carbon dioxide and nitrogen.

[0008] Furthermore, if the hollow ball does not need to function as a high-level water tank, air, carbon dioxide, nitrogen or other gases can be filled in it, and the water inlet pipe and the water outlet pipe are both closed.

[0009] Furthermore, if the hollow plastic ball is used as a high-level water tank, fire-fighting water can be injected into it from the water inlet pipe, and at this time, the water inlet pipe and the water outlet pipe are both closed.

[0010] Furthermore, the hollow plastic ball is used to store water, the water inlet pipe is opened, and the water outlet pipe is selectively opened.

[0011] Furthermore, the water outlet pipe comprises branch pipes respectively connected to the bottom ends of the hollow plastic balls and a collecting pipe simultaneously connected to the branch pipes, and a switch valve is arranged in the collecting pipe.

[0012] Furthermore, a flange is extended upward from the edge of the base panel, and the height of the flange is higher than the top of the water inlet pipe.

[0013] Furthermore, the upper surface of the polyurethane foam layer is also provided with planting soil, the top of the planting soil is lower than the top of the flange, and the top of the water inlet pipe is higher than the top of the planting soil; or the polyurethane foam layer is replaced by planting soil.

[0014] Furthermore, pipeline holes are arranged in the area of ​​the polyurethane foaming agent layer between adjacent hollow plastic balls.

[0015] The method for manufacturing a roof according to the present invention is used to manufacture the above-mentioned roof, comprising the following steps:

[0016] Step 1: Make a base panel; Step 2: First, lay a bottom horizontal steel plate on the upper surface of the base panel, then connect the bottom of the vertical steel plate with the bottom horizontal steel plate, and finally connect the top of the vertical steel plate with the top horizontal steel plate to form a steel cage; Step 3: Place hollow plastic balls in the steel cage; Step 4: Lay a polyurethane foam layer on the upper surface of the base panel, and open pipeline holes in the area of ​​the polyurethane foam layer located between adjacent hollow plastic balls; Step 5: Lay planting soil on the polyurethane foam layer.

[0017] Compared with the prior art, the roof and the manufacturing method of the present invention have the following advantages:

[0018] 1) The use of hollow plastic balls greatly reduces the amount of concrete used, generally reducing the amount of concrete used by 23%-38%, thereby reducing carbon dioxide emissions. At the same time, the hollow plastic balls can be recycled and reused for secondary house construction, greatly saving the material cost of building houses. In addition, plastics have always been one of the sources of environmental pollution. The present invention recycles plastic pollutants and reuses them to make hollow plastic balls, which is more economical and environmentally friendly.

[0019] 2) Hollow plastic balls can reduce the load on the roof, effectively prevent the house from sinking and cracking, and greatly reduce the probability of people being crushed to death when an earthquake strikes. One kilogram of hollow balls can replace 100 kilograms of concrete. Due to the small amount of concrete used, the weight of the roof panel is greatly reduced, and the beams and columns of the building save a lot of steel and concrete.

[0020] 3) The surface of the hollow plastic ball is black. It absorbs heat during the day to prevent heat from being transferred to the room. At night, it can release heat and keep the house warm, so that the temperature in the house is always balanced and the indoor comfort is improved. Therefore, this setting can also make the house warm in winter and cool in summer. Even if the house is removed in the future, these hollow plastic balls can be recycled, which is more green and environmentally friendly than concrete.

[0021] 4) The existing reinforced concrete roof has weak sound insulation. Sometimes the noise in the roof equipment room can be heard in the room downstairs. The present invention can make the roof have good sound insulation effect by filling the hollow plastic ball with sound insulation gas;

[0022] 5) In the existing house, the pipelines often need to be routed under the floor panels of the downstairs rooms. If a water leak occurs, it is necessary to enter the downstairs house for repair, which easily leads to conflicts between neighbors. The present invention penetrates the pipes in the area between adjacent hollow plastic balls of the polyurethane foaming agent layer. If a water leak occurs, the pipes can be repaired and replaced directly from the roof of the house.

[0023] 6) The current roofs need to be made of a very thick insulation layer for heat preservation and heat insulation. The present invention directly uses the air layer in the middle of the hollow plastic ball for heat preservation and heat insulation, saving the use of insulation materials, that is, saving insulation materials, reducing loads, and saving construction time;

[0024] 7) The roof of the present invention has the functions of heat preservation, thermal insulation, planting, water saving, water storage, pipeline threading, light weight, sound insulation, cost saving, low carbon emission, etc. It can be manufactured in a factory, is convenient for on-site construction, is not affected by the climate, is more suitable for prefabricated buildings, and is easy to promote on a large scale. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic diagram of a front cross-section of a roof structure according to an embodiment of the present invention;

[0026] Figure 2 is a schematic top view of a roof structure according to an embodiment of the present invention;

[0027] Figure 3 for Figure 1 A top view of the bottom horizontal reinforcement plate is shown;

[0028] Figure 4 for Figure 1 A top view of the top horizontal reinforcement plate is shown. DETAILED DESCRIPTION

[0029] In order to better understand the purpose, structure and function of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings.

[0030] Figure 1 and Figure 2 FIG. 1 shows the structure of a roof 100 according to an embodiment of the present invention. Figure 1 and Figure 2 As shown, the roof 100 may include: a base panel 1, which is a reinforced concrete panel or a steel plate; a plurality of steel cages 2 arranged at intervals and fixedly connected to the upper surface of the base panel 1; hollow plastic balls 3 located in the steel cages 2, and a polyurethane foaming agent layer 4 connected to the base panel 1, wherein the polyurethane foaming agent layer 4 completely covers each steel cage 2 and the hollow plastic balls 3 located therein. The top end of the hollow plastic ball 3 is connected to a water inlet pipe 31 passing through the polyurethane foaming agent layer 4, and the bottom end of the hollow plastic ball 3 is connected to a water outlet pipe 32 passing through the base panel 1.

[0031] The roof 100 of the embodiment of the present invention uses a steel cage 2 to fix the hollow plastic balls 3 on the base panel 1. On the one hand, the use of the hollow plastic balls 3 greatly reduces the amount of concrete used. Compared with the roof made entirely of reinforced concrete panels in the prior art, it can generally reduce the amount of concrete used by 23%-38%, thereby reducing carbon dioxide emissions. At the same time, the hollow plastic balls 3 can also be recycled and reused for secondary construction, greatly saving the material cost of building houses. In addition, plastics have always been one of the sources of environmental pollution. The present invention recycles plastic pollutants to make hollow plastic balls 3, which is more economical and environmentally friendly. On the one hand, the hollow plastic balls 3 can reduce the load on the roof, effectively prevent the house from sinking and cracking, and the probability of people being crushed to death when an earthquake occurs is also greatly reduced. One kilogram of hollow balls can replace 100 kilograms of concrete. Since less concrete is used, the weight of the roof panel is greatly reduced, and the beams and columns of the building save a lot of steel and concrete. On the other hand, since the hollow plastic balls 3 can be filled with insulating gas or water and other media, combined with the use of the polyurethane foam layer 3, not only can the use of insulating materials be greatly saved, but also the insulating materials are saved, the load is reduced, the construction period is saved, and it is also helpful to improve the sound insulation performance of the roof 100.

[0032] In a preferred embodiment, the surface of the hollow plastic balls 3 can be black, which can absorb heat during the day to prevent heat from being transferred into the room. At night, it can release heat and have an insulation effect on the house to keep the temperature in the house balanced at all times, thereby improving the indoor comfort. Therefore, such a setting can also make the house warm in winter and cool in summer. Even if the hollow plastic balls 3 are removed from the house in the future, they can still be recycled, which is more green and environmentally friendly than concrete.

[0033] According to the present invention, in Figure 1 In the preferred embodiment shown, when the base panel 1 is a steel plate, the outer surface of the steel plate can be coated with fire retardant coating and anticorrosive coating to improve its fire resistance and durability. Specifically, different fire retardant coatings can be applied to the steel plate according to different fire resistance levels of the building and different fire resistance times, and then anticorrosive coatings can be applied. Preferably, the thickness of the steel plate can be 60mm-180mm. When the base panel is a reinforced concrete slab, its thickness is preferably not less than 60mm, and the reinforced concrete can be C30.

[0034] According to the present invention, in Figure 1 and Figure 2In the preferred embodiment shown, the steel cage 2 may include a bottom horizontal steel plate 21 fixedly connected to the upper surface of the base panel 1, a top horizontal steel plate 22 located above the bottom horizontal steel plate 21, and a vertical steel plate 23 connecting the bottom horizontal steel plate 21 and the top horizontal steel plate 22. The bottom horizontal steel plate 21, the top horizontal steel plate 22 and the vertical steel plate 23 together form a space for accommodating and clamping the hollow plastic ball 3. In this embodiment, the steel cage 2 may be a finished product, which is directly fixed to the base panel 1 when in use, or may be fixed to the base panel 1 through the following embodiments.

[0035] In such Figure 2 and Figure 3 In the preferred embodiment shown, the upper surface of the base panel 1 may be arranged with a plurality of first longitudinal steel bars 211 at intervals along the transverse direction thereof, and a plurality of first transverse steel bars 212 may be arranged with intervals along the longitudinal direction thereof, so that each first longitudinal steel bar 211 and each first transverse steel bar 212 are arranged in a mesh shape to form a plurality of first grids 213, and the bottom horizontal steel bar plate 21 may be formed by a plurality of first grids 213; Figure 4 As shown, a plurality of second longitudinal steel bars 221 may be arranged at intervals in the horizontal direction above the upper surface of the base panel 1, and a plurality of second transverse steel bars 222 may be arranged at intervals in the longitudinal direction, so that each second longitudinal steel bar 221 and each second transverse steel bar 222 are arranged in a mesh to form a plurality of second grids 223, and the top horizontal steel bar plate 22 may be formed by at least one second grid 223; Figure 2 As shown, the vertical steel bar plate 23 may include at least two vertical steel bars 231, which are connected between the first grid 213 and the second grid 223, and the at least two vertical steel bars 231 are respectively located on opposite sides of the bottom horizontal steel bar plate 21, and the hollow plastic ball 3 is accommodated and clamped in a space formed by multiple first grids 213, at least one second grid 223 and at least two vertical steel bars 231.

[0036] In this embodiment, the first longitudinal steel bar 211 and each first transverse steel bar 212 can be fixed to the base panel 1 by pre-embedding, and the vertical steel bar 231 and the first grid 213 and the second grid 223 can be connected by manual binding, welding, mechanical connection, etc., to ensure that the steel bars are firmly connected and accurately positioned, thereby ensuring the safety and stability of the structure. This embodiment makes the on-site construction of the steel cage 2 more convenient, is not affected by the climate, is more suitable for prefabricated buildings, and is easy to promote on a large scale.

[0037] Preferably, the first longitudinal steel bar 211, the first transverse steel bar 212, the second longitudinal steel bar 221 and the second transverse steel bar 222 can all be made of HRB400, the diameter of the steel bar should not be less than 8 mm, the minimum reinforcement ratio is 0.2%, the spacing between adjacent first longitudinal steel bars 211 and adjacent first transverse steel bars 212 can be 70 mm-200 mm, on the basis of ensuring that the hollow plastic ball 3 can be clamped, the spacing between adjacent second longitudinal steel bars 221 and adjacent second transverse steel bars 222 can be larger than the spacing between adjacent first longitudinal steel bars 211 and adjacent first transverse steel bars 212, so as to further save the amount of steel bars.

[0038] Also preferably, the hollow plastic ball 3 can be made of recycled plastic and can be round, oval, oblate or the like. The height of the hollow plastic ball is preferably 40 mm-120 mm.

[0039] According to the present invention, in Figure 1 and Figure 2 In the preferred embodiment shown, the hollow plastic ball 3 can be used for heat preservation and sound insulation. At this time, the hollow plastic ball 3 can be used to fill with heat preservation gas, and the water inlet pipe 31 and the water outlet pipe 32 are both closed. The heat preservation gas includes at least one of air, carbon dioxide and nitrogen. The thermal conductivity of the existing roof is usually between 0.028-0.041W / (m·K) (such as polystyrene board). In this embodiment, by filling the hollow plastic ball 3 with air, carbon dioxide, nitrogen and other gases, the thermal conductivity of air is generally between 0.023-0.026W / (m·K), the thermal conductivity of nitrogen is generally between 0.015-0.025W / (m·K), and the thermal conductivity of carbon dioxide is generally between 0.016-0.024W / (m·K), so the thermal conductivity can be effectively reduced to achieve a better heat preservation effect. In addition, the density of air in the hollow plastic ball 3 in this embodiment is 1.29 kg / m3, the density of nitrogen is 1.25 kg / m3, and the density of carbon dioxide is 1.977 kg / m3, which can also achieve a good thermal insulation effect.

[0040] In such Figure 1 and Figure 2 In the preferred embodiment shown, the hollow plastic ball 3 can also be used as a high-level water tank. In this case, the hollow plastic ball 3 can be used to store water, the water inlet pipe 31 is opened, and the water outlet pipe 32 is selectively opened. The hollow plastic ball 3 can be used to store rainwater, thereby achieving heat insulation and water storage functions (as a fire water tank or a domestic water tank), which can save the cost of building a high-level water tank on the roof. In addition, fire water can also be injected into the interior from the water inlet pipe 31, and the water inlet pipe 31 and the water outlet pipe 32 are both closed.

[0041] Furthermore, if Figure 1As shown, the water outlet pipe 32 may include branch pipes 321 respectively connected to the bottom ends of the hollow plastic balls 3 and a collection pipe 322 simultaneously connected to the branch pipes 321, and a switch valve 33 is arranged in the collection pipe 322. In this embodiment, the upper part of each hollow plastic ball 3 allows rainwater to flow into the hollow plastic ball 3 through the water inlet pipe 31, and the water inlet pipe 31 may be 200mm-300mm higher than the top surface of the polyurethane foaming agent layer. The rainwater in the hollow plastic ball 3 flows out from the branch pipes 321 at the lower part of each hollow plastic ball and is collected in the collection pipe 322. The collection pipe 322 is provided with a switch valve 33, so that it can be connected to the living water system or the fire water system.

[0042] Preferably, if Figure 1 As shown, a filter screen 34 may also be provided at the top of the water inlet pipe 31. The filter screen 34 is used to prevent the pipe from being blocked by debris or small animals from entering.

[0043] According to the present invention, in Figure 1 In the preferred embodiment shown, the edge of the base panel 1 also extends upward with a flange 5, and the height of the flange 5 is higher than the top of the water inlet pipe 34. This arrangement is used to realize the water storage function of the roof as a whole, and the stored water can enter the hollow plastic ball 3 through the water inlet pipe 34.

[0044] Furthermore, in a preferred embodiment, if the roof needs to be insulated and planted at the same time, planting soil (not shown in the figure) can be set on the upper surface of the polyurethane foam layer 4, the top of the planting soil is lower than the top of the flange 5, and the top of the water inlet pipe 31 is higher than the top of the planting soil. The planting soil can be used to plant plants or vegetables, which can not only allow children in the city to pick them to educate them about agricultural knowledge and save agricultural land, but also can achieve the effect of shading and reducing the urban heat island effect.

[0045] In another preferred embodiment, if the roof does not need to be insulated but needs to be planted, the planting soil can directly replace the polyurethane foam layer 4 and be directly used to fill the gaps between adjacent hollow plastic balls 3.

[0046] According to the present invention, in Figure 1 In the preferred embodiment shown, the polyurethane foam layer 4 may be provided with pipeline holes 41 in the region between the adjacent hollow plastic balls 3. The pipeline holes 41 may be used for routing professional pipelines such as water, heating, and electricity. Existing professional pipelines such as water, heating, and electricity are arranged under the roof panels and beams, which makes the ceiling in the room very low, and seriously makes the net height of the room and corridor very low. In this embodiment, after the professional pipelines such as water, heating, and electricity are arranged in the gaps between the hollow plastic balls 3, the floor height space of the room is effectively reduced, saving 2%-3% of the cost of the building.

[0047] In addition, the present invention also proposes a method for making the above-mentioned roof, which may include the following steps: Step 1: Making a base panel 1; Step 2: First, laying a bottom horizontal steel plate 21 on the upper surface of the base panel 1, and then connecting the bottom of the vertical steel plate 23 with the bottom horizontal steel plate 21 by manual binding, welding, mechanical connection, etc., and finally connecting the top of the vertical steel plate 23 with the top horizontal steel plate 22 by manual binding, welding, mechanical connection, etc., so as to form a steel cage 2. When the base panel 1 is a reinforced concrete slab, the steel cage 2 can be fixed by pre-embedding, and when the base panel 1 is a steel plate, the steel cage 2 can be fixed by welding; Step 3: Placing hollow plastic balls 3 into the steel cage 2; Step 4: Laying a polyurethane foam layer 4 on the upper surface of the base panel 1, and opening a pipeline hole 41 in the area of ​​the polyurethane foam layer 4 located between adjacent hollow plastic balls 3; Step 5: Laying planting soil on the polyurethane foam layer 4.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A roof, characterized in that: include: A base panel, wherein the base panel is a reinforced concrete slab or a steel plate; A plurality of spaced apart steel cages fixedly connected to the upper surface of the base panel; a hollow plastic ball located within the steel cage, and A polyurethane foam layer connected to the base panel, the polyurethane foam layer completely covers each of the steel cages and the hollow plastic balls located therein, The top end of the hollow plastic ball is connected to a water inlet pipe passing through the polyurethane foaming agent layer, and the bottom end of the hollow plastic ball is connected to a water outlet pipe passing through the base panel.

2. The roof according to claim 1, characterized in that The steel cage includes a bottom horizontal steel plate fixedly connected to the upper surface of the base panel, a top horizontal steel plate located above the bottom horizontal steel plate, and a vertical steel plate connecting the bottom horizontal steel plate and the top horizontal steel plate. The bottom horizontal steel plate, the top horizontal steel plate and the vertical steel plate together form a space for accommodating and clamping the hollow plastic balls.

3. The roof according to claim 2, characterized in that: The upper surface of the base panel is arranged with a plurality of first longitudinal steel bars at intervals along the transverse direction, and a plurality of first transverse steel bars are arranged with intervals along the longitudinal direction, so that each of the first longitudinal steel bars and each of the first transverse steel bars are arranged in a mesh to form a plurality of first grids, and the bottom horizontal steel bar plate is formed by a plurality of first grids; a plurality of second longitudinal steel bars are arranged in a transverse direction above the upper surface of the base panel, and a plurality of second transverse steel bars are arranged in a longitudinal direction, so that each of the second longitudinal steel bars and each of the second transverse steel bars are arranged in a mesh to form a plurality of second grids, and the top horizontal steel bar plate is formed by at least one second grid; the vertical steel bar plate includes at least two vertical steel bars, the vertical steel bars are connected between the first grid and the second grid, and the at least two vertical steel bars are respectively located on opposite sides of the bottom horizontal steel bar plate, and the hollow plastic ball is accommodated and clamped in a space formed by the plurality of first grids, the at least one second grid and the at least two vertical steel bars.

4. The roof according to any one of claims 1 to 3, characterized in that: The hollow plastic ball is used to be filled with heat-insulating gas, the water inlet pipe and the water outlet pipe are both closed, and the heat-insulating gas includes at least one of air, carbon dioxide and nitrogen.

5. The roof according to any one of claims 1 to 3, characterized in that: The hollow plastic ball is used for storing water, the water inlet pipe is opened, and the water outlet pipe is selectively opened.

6. The roof according to claim 5, characterized in that The water outlet pipe comprises branch pipes respectively connected with the bottom ends of the hollow plastic balls and a collecting pipe simultaneously connected with the branch pipes, and a switch valve is arranged in the collecting pipe.

7. The roof according to any one of claims 1 to 3, characterized in that: A flange is also extended upward from the edge of the base panel, and the height of the flange is higher than the top end of the water inlet pipe.

8. The roof according to claim 7, characterized in that The upper surface of the polyurethane foam layer is also provided with planting soil, the top of the planting soil is lower than the top of the flange, and the top of the water inlet pipe is higher than the top of the planting soil; or the polyurethane foam layer is replaced by planting soil.

9. The roof according to any one of claims 1 to 3, characterized in that: The polyurethane foaming agent layer is provided with pipeline holes in the area between adjacent hollow plastic balls.

10. A method for manufacturing a roof, used for manufacturing the roof according to any one of claims 2 to 9, characterized in that: The following steps are involved: Step 1: making the base panel; Step 2: firstly, laying the bottom horizontal steel plate on the upper surface of the base panel, then connecting the bottom of the vertical steel plate with the bottom horizontal steel plate, and finally connecting the top of the vertical steel plate with the top horizontal steel plate, thereby forming the steel cage; Step 3: placing the hollow plastic ball into the steel cage; Step 4: laying the polyurethane foaming agent layer on the upper surface of the base panel, and opening pipeline holes in the area of ​​the polyurethane foaming agent layer located between adjacent hollow plastic balls; Step 5: Spreading planting soil on the polyurethane foaming agent layer.

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