WO2016004769A1

WO2016004769A1 - Double-layer hollow isosceles trapezoidal multifunctional resin roof plate

Info

Publication number: WO2016004769A1
Application number: PCT/CN2015/073743
Authority: WO
Inventors: 丁荣吾
Original assignee: 丁荣吾
Priority date: 2014-07-07
Filing date: 2015-03-06
Publication date: 2016-01-14
Also published as: CN104153520B; CN104153520A

Abstract

A double-layer hollow isosceles trapezoidal multifunctional resin roof plate, comprising a roof plate main body, the roof plate main body comprising a double-layer hollow trapezoidal upper bottom plate (10), a double-layer hollow trapezoidal waist plate (20) and a double-layer hollow trapezoidal lower bottom plate (30). The upper bottom plate (10), the waist plate (20), the lower bottom plate (30) and the other waist plate (20) are orderly and repeatedly connected to form a wave continuous structure, and the double-layer hollow structures of the upper bottom plate (10), the waist plate (20) and the lower bottom plate (30) is provided with reinforcing ribs (40). The roof plate main body uses PVC modified resin as an aggregate, and the surface of the aggregate is sprayed with a layer of protective coating. The roof plate has an advantage of convenience in storage, transportation and construction.

Description

Double-layer hollow isosceles trapezoidal multifunctional resin house cover

Technical field

The invention relates to the field of new building materials, in particular to a double-layer hollow isosceles trapezoidal multifunctional resin house cover.

Background technique

Light weight, load-bearing, anti-seismic, heat-insulating, flame-retardant, anti-corrosion, anti-acid and alkali, energy-saving and environmentally friendly, durable... has become the development direction of new building materials industry products in the 21st century. Over the past decades, various new products, new technologies and new components have emerged, making great contributions to the development of the construction industry. For example, for the shed roof, there are cement fiber corrugated cover, sunlight plastic plate, tempered glass light transmission, glazed galvanized and colored iron corrugated color plate, iron corrugated sandblasting protective plate ... All kinds of roof panels have their own characteristics and suitable uses, and have played a positive contribution in economic construction. However, there are also weaknesses such as low functionality, aging, difficulty in bearing weight, poor heat insulation, poor physical and chemical properties, and poor cost performance.

Summary of the invention

The main object of the present invention is to overcome the shortcomings of the prior art roof covering, such as less function, aging, difficulty in bearing, poor heat insulation and poor cost performance, and a double-layer hollow isosceles trapezoidal multifunctional resin house cover. It has many excellent properties such as pressure, heat insulation, flame retardant, waterproof, acid and alkali resistance, sun protection, anticorrosion, electrical insulation, antifreeze, shock resistance and light weight.

The invention integrates multi-disciplinary technicians, research and development design, and invests in a large amount after in-depth analysis and research on the functional scope, technical attributes, production methods, and price comparisons of the above products. And the long-term experiment, application and comparison, developed the technical solution of the present invention.

The core objective of the invention is to upgrade the product to a two-layer structure on the basis of light technology, and to set a square hole and a rectangular hole space with a certain width and height between the upper and lower plates of the double layer, and the upper and lower spaces. Connected by ribs, it becomes a single-piece hollow shed cover. The double-layer single-plate has a wavy undulation and forms a continuous isosceles trapezoidal structure. The top surface of the trapezoid and the bottom surface are upper and lower, and the bottom and bottom are designed to have a reasonable height difference and the center of the upper and lower planes. Vertically reasonable distance, first of all to take advantage of the comprehensive advantages of single-plate mathematics and mechanics, and then connect these single-piece boards into pieces with a unique and simple structure, which becomes a practical shed roof. The raw material is a new group of PVC pressure-bearing multi-functional formula, optimized for the preparation of protective layer coatings, and the product is made by “squeeze and spray one-step method”, which makes this product have an incomparable integration advantage that obviously exceeds other plastic light shed roofs. .

In the 21st century, new requirements have been put forward for the invention of technologies for promoting the development of new building materials: such as energy saving, environmental protection, safety, light weight, shock resistance, compression resistance, flame retardancy, heat insulation, corrosion protection, acid and alkali resistance, durability, convenient construction and good cost performance. ... to make the technology of the present invention coincide with the development direction of the main industry, and can be quickly transformed into productivity, achieving obvious economic, social, ecological, and enterprise self-efficiency. The invention is an integrated technology for intensively researching and developing multi-disciplinary technicians under the condition of understanding the above technical goals and the development direction of industries and products.

The invention adopts the following technical solutions:

The double-layer hollow isosceles trapezoidal multifunctional resin house cover comprises a roof cover body, and the roof cover body comprises a double-layer hollow trapezoidal upper bottom plate, a double-layer hollow trapezoidal waist plate and a double-layer hollow trapezoidal lower bottom plate. The upper bottom plate, the waist plate, the lower bottom plate and the waist plate are sequentially and repeatedly connected to form a undulating continuous structure, and the double bottom hollow structure of the upper bottom plate, the waist plate and the lower bottom plate is provided with a reinforcing rib; The ratio of the planar area of the bottom plate to the planar area of the lower base plate is 1:1.5-2.5; the angle between the waist plate and the plane of the upper bottom plate or the lower bottom plate is 38-42°.

Preferably, a surface of the roof cover body is sprayed with a graft type modified ethylene propylene diene resin copolymer, and the composition of the graft type modified ethylene propylene diene resin copolymer is as follows: polyacrylate 33% by weight , acrylonitrile 35 wt% and styrene 32 wt%. The graft-type modified ethylene propylene diene resin copolymer significantly improves the viscosity, strength, toughness, heat resistance, stability and ductility of the sprayed layer, and improves the yield of the product.

Preferably, the weight of the roof cover body aggregate is as follows: 60-71 parts of PVC raw materials; 14-16 parts of light calcium powder; 5-7 parts of heavy calcium powder; 3-4 parts of composite calcium-zinc stabilizer; White powder 1-3 parts; zinc oxide 0.5-1.5 parts; di-n-octyl phthalate 0.8-1.5 parts; stearic acid 0.3-0.5 parts; butyl stearate 0.2-0.4 parts; aluminum silicate 0.5-2 ACR (graft copolymer of methyl methacrylate with butyl acrylate and styrene emulsion) 1.2-1.5 parts; CPE (amorphous polyethylene modified polymer) 4-5 parts.

Preferably, the thickness of the single layer in the double bottom structure of the upper bottom plate, the waist plate and the lower bottom plate is 1.1-2.5 mm, and the distance between the two single layers in the double bottom structure of the upper bottom plate, the waist plate and the lower bottom plate is 8-20 mm, The rib has a thickness of 0.6-2.5 mm, and a vertical distance between the upper surface of the upper bottom plate and the lower surface of the lower bottom plate is 35-60 mm, and the center of the upper bottom plate and the center of the adjacent lower bottom plate The horizontal distance is 70-85mm.

Preferably, the upper bottom plate, the waist plate, the lower bottom plate and the waist plate are sequentially and repeatedly connected to form a single piece of the roof cover body having a length of 500-1500 mm.

Preferably, the two ends of the single-piece roof cover body respectively extend to form an upper butt cantilever and a lower butt cantilever for the connection of two adjacent roof panels, and the upper butt cantilever and the lower butt cantilever are connected The layers are stacked one upon another to form a structure that conforms to the undulating continuous structure of the roof panel body.

Preferably, one side of the upper butt cantilever and the lower butt cantilever are provided with a concave-convex positioning column groove structure.

Preferably, the overall thickness of the upper butt cantilever and the lower butt cantilever overlaps ≥ the thickness of the roof cover body.

Preferably, the upper butt cantilever and the lower butt cantilever are respectively formed upward, parallel and downward from the waist plate of the roof cover body.

Preferably, the reinforcing rib is a vertical reinforcing rib or an equilateral triangular reinforcing rib. The triangular ribs are mainly used when the overall size of the product is large to improve the role of the ribs.

Compared with the prior art, the double-layer hollow isosceles trapezoidal multifunctional resin house cover of the present invention has the following beneficial effects:

1. The double-layer hollow isosceles trapezoidal multifunctional resin house cover of the invention is a undulating continuous structure, and when subjected to self-weight and external force augmentation, the uniform decomposition pressure and vibration can be exerted by the micro-elastic function of the wave and isosceles shape. The force acts to decompose the external pressure from the plane of the upper floor, and the plane area of the lower floor is 1.5-2.5 times the plane area of the upper floor, ensuring pressure stability and reducing the pressure load. The double-layer hollow structure of the upper bottom plate, the waist plate and the lower bottom plate is provided with reinforcing ribs, so that the double-layer hollow structure of the upper bottom plate, the waist plate and the lower bottom plate are integrally connected, and has strong pressure bearing capacity. The double-layer hollow structure is composed of a plurality of grids, and the air in the space flows very little. It is a poor conductor of heat, which constitutes the physical property of both heat insulation and warmth, and creates internal conditions for warm winter and cool summer, and directly reduces air conditioning and cooling in summer. And the energy consumption of winter heating.

Second, the graft type modified EPDM resin sprayed on the surface of the roof cover body has a chamber External long-term high temperature resistance (≥90 °C), resistance to severe cold (≤-45 °C) chemical and physical stability and high adhesion grafting properties, plus the physical and chemical basis of PVC aggregate anti-aging and heat-resistant cold-resistant formula, inside and outside The similarity combination of materials and materials consolidates the hot and cold, shrinkage synchronization, and greatly prolongs the natural aging time of the roof covering. After the anti-aging test and three outdoor five-year anti-aging pilot tests, the test data is taken and the materials are substituted. The anti-aging formula, the number of conversion results is 20 years, exceeding the expected set of 15 years.

Third, the aggregate formula of the roof cover body can be adjusted according to the geographical latitude and climatic characteristics of the area used by the roof cover of the present invention to adapt to the characteristics of annual sunshine time, annual accumulated temperature, annual temperature change and daily temperature difference of different climatic zones. Improve the suitability of the product. From the low latitude to the high latitude cold zone, in the aggregate formula of the present invention, in the low latitude tropical region, although the annual accumulated temperature is higher than the cold zone, the daily difference is smaller, and the annual temperature is smaller. Under the protection of the protective coating, the PVC raw materials adopt low values, and the other 11 raw materials adopt high values, which achieve the purpose of complementary raw material characteristics, stable product quality and durability; while in high-latitude cold zone, PVC raw materials adopt high values, other The 11 raw materials use low values, which also achieve the purpose of stable and durable products. As for the mid-latitude subtropical and warm temperate zones, the PVC raw materials and the other 11 raw materials are all in the middle value, and the same effect can be achieved. The qualitative and quantitative methods for this flexible blending of aggregate formulations come from years of trials and field applications, providing a reliable technical foundation and realistic product economic value for new products.

Fourth, the angle between the waist plate and the plane of the upper bottom plate or the lower bottom plate is 38-42°, and the thickness of the single layer in the double bottom structure of the upper bottom plate, the waist plate and the lower bottom plate is 1.1-2.5 mm, and the upper bottom plate, the waist plate and the lower bottom plate are double The distance between the two single layers in the layer structure is 8-20 mm, the thickness of the reinforcing rib is 0.6-2.5 mm, and the vertical distance between the upper surface of the upper bottom plate and the lower surface of the lower bottom plate is 35-60 mm, the horizontal distance between the center of the upper bottom plate and the center of the adjacent lower bottom plate is 70-85 mm. The setting of these dimensions is more conducive to adjusting the pressure of the isosceles trapezoid and the deformation effect caused by the cold heat and shrinkage, and the calculation and test of the physical strength and toughness brought by the aggregate formula of the roof cover body of the present invention. The self-weight pressure of the cover plate plus the gravity factors such as construction workers, rain and snow, has been proven to be fully competent and subject to the above-mentioned pressures through multiple applications.

5. The two ends of the single-piece roof cover body respectively extend to form an upper butt cantilever and a lower butt cantilever for connecting two adjacent roof panels, and the upper butt and the lower butt can are stacked and joined together to form a joint The undulating continuous structure of the roof panel body has a uniform structure, so that the overall structure of the plurality of roof panels is connected, and the adhesive can be bonded by the upper docking cantilever and the lower butting cantilever, or The upper screws are fastened to ensure a secure, long-lasting connection. The overlapping surface between the upper butt arm and the lower butting arm is provided with a concave-convex positioning column groove structure to prevent sliding after the connection. The overall thickness of the upper butt cantilever and the lower butt cantilever overlaps ≥ the thickness of the roof cover body, ensuring that the mechanical strength of the joint position is greater than that of the single plate, ensuring a firm connection. The upper butt arm and the lower butt arm are respectively formed upward, parallel and downward from the waist plate of the roof cover body. When connecting, the end of the upper butt arm abuts against the angle space formed by the lower butt arm and the waist plate, and the lower butt joint The end of the cantilever is abutted in the angular space formed by the upper butt cantilever and the waist plate, and the upper butt and the lower butt can are fixed and fixed, and the rainwater and snow water are prevented from penetrating under the roof cover.

DRAWINGS

1 is a schematic structural view of a double-layer hollow isosceles trapezoidal multifunctional resin house cover according to an embodiment of the present invention;

2 is a schematic structural view of the double buttocks of the double-layered hollow isosceles trapezoidal multifunctional resin house cover according to the present invention when the upper butt cantilever and the lower butt cantilever are separated;

FIG. 3 is a schematic structural view of the double buttocks of the double-layered hollow isosceles trapezoidal multifunctional resin house cover according to the present invention when the upper butt cantilever and the lower butt cantilever are overlapped.

detailed description

The double-layer hollow isosceles trapezoidal multifunctional resin roof cover of the invention is manufactured by extruding aggregates made of PVC raw materials and other 11 raw materials through a high-power extruder in an ultra-wide combination mold. At the same time of extrusion molding, the graft-type modified EPDM resin copolymer is sprayed on the surface of the formed roof cover to realize the one-step process of extrusion molding and spraying, energy saving, time saving, labor saving, and improvement of aggregate and coating. The combination of strength, thereby improving the overall protection quality and output of products, extending product life cycle and reducing production costs. During the 20-year warranty period, the price per square meter is about 18 yuan, and the cost performance of the product is relatively high. The average annual depreciation is only 1 yuan per square meter.

Referring to Figure 1, the double-layer hollow isosceles trapezoidal multifunctional resin house cover of the present invention comprises a roof cover body, and the roof cover body comprises a double-layer hollow trapezoidal upper bottom plate 10, a double-layer hollow trapezoidal waist plate 20 and a double The hollow trapezoidal lower bottom plate 30, the upper bottom plate 10, the waist plate 20, the lower bottom plate 30 and the waist plate 20 are sequentially and repeatedly connected to form a undulating continuous structure, and the double bottom hollow structure of the upper bottom plate 10, the waist plate 20 and the lower bottom plate 30 is provided The rib 40; the ratio of the plane area of the bottom plate 10 to the plane area of the lower bottom plate 30 is 1:1.5-2.5; the angle α between the waist plate 20 and the plane of the upper bottom plate 10 or the lower bottom plate 30 is 38-42°.

The thickness h1 of the single layer in the double layer structure of the upper bottom plate 10, the waist plate 20 and the lower bottom plate 30 is 1.1-2.5 mm, and the distance 11 between the two single layers in the double-layer structure of the upper bottom plate 10, the waist plate 20 and the lower bottom plate 30 is 8- 20mm, the thickness h2 of the rib 40 is 0.6-2.5 mm, and the vertical distance 12 between the upper surface of the upper bottom plate 10 and the lower surface of the lower bottom plate 30 is 35-60 mm, and the center of the upper bottom plate 10 and its adjacent lower bottom plate The horizontal distance 13 of the center of 30 is 70-85 mm. Strengthening in the upper bottom plate 10 The number of the ribs 40 is 2-6, the number of the ribs 40 in the waist plate 20 is 2-6, and the number of the ribs 40 in the lower bottom plate 30 is 3-7.

The length of the single-piece roof panel body formed by sequentially and repeatedly connecting the upper bottom plate 10, the waist plate 20, the lower bottom plate 30, and the waist plate 20 is 500-1500 mm.

Referring to Figures 2 and 3, two adjacent roof panels 100 and 100' extend respectively with a lower docking boom 60 and an upper docking boom 50. The upper half of the waist panel 20' of the roof panel 100' extends upward to form an upper extension 51, and then horizontally extends to form a horizontal portion 52, and then extends downward to form a lower extension portion 53, an upper extension portion 51, a horizontal portion 52, and a lower extension portion. The portions 53 collectively constitute an upper butting cantilever 50, and a triangular positioning groove 54 is formed in the lower extending portion 53, and the upper extending portion 51 forms a rectangular angle 55 with the waist plate 20'. The lower half of the waist panel 20 of the roof panel 100 extends upward to form an upper extension portion 61, and then horizontally extends to form a horizontal portion 62, and then extends downward to form a lower extension portion 63, an upper extension portion 61, a horizontal portion 62, and a lower extension portion. 63, the lower abutment cantilever 60 is formed in common, and a triangular positioning post 64 is formed on the upper extending portion 61 to fit the positioning groove 54, and the upper extending portion 61 forms a rectangular angle 65 with the waist plate 20. When the upper butting cantilever 50 and the lower butting cantilever 60 are superposed on each other, the end of the lower extending portion 53 abuts against the angular space 65, is restricted from being extended downward, and the end of the lower extending portion 63 abuts against the clip. In the corner space 55, it is limited and cannot be extended further.

Referring to Figure 3, the upper butt cantilever 50 and the lower butt cantilever 60 are stacked one upon another to form a structure that conforms to the undulating continuous structure of the roof panel body. The overall thickness of the upper butt arm 50 and the lower butt arm 60 is ≥ the thickness of the roof cover body.

Application example one

The composition of PVC raw materials and 11 other raw materials are: 71 parts of PVC raw materials; 14 parts of light calcium powder; 5 parts of heavy calcium powder; 3 parts of complex calcium-zinc stabilizer; 1 part of titanium dioxide; 0.5 parts of zinc oxide; 0.8 parts of di-n-octyl acidate; 0.3 parts of stearic acid; 0.2 parts of butyl stearate; 0.5 parts of aluminum silicate; 1.2 parts of ACR; 4 parts of CPE.

The other structure is consistent with the above description. It is applied to the agricultural product storage house of Mongolian Hulunbeier at 47 degrees north latitude, with an area of 1000 m ² and a service life of 5 years.

Application example two

The composition of PVC raw materials and 11 other raw materials are: 66 parts of PVC raw materials; 15 parts of light calcium powder; 6 parts of heavy calcium powder; 3.5 parts of complex calcium-zinc stabilizer; 2 parts of titanium dioxide; 1 part of zinc oxide; 1.2 parts of n-octyl ester; 0.4 parts of stearic acid; 0.3 parts of butyl stearate; 1.2 parts of aluminum silicate; 1.4 parts of ACR; 4.5 parts of CPE.

The other structure is consistent with the above description. It is applied to the Jiaxing Building Materials Warehouse in Zhejiang Province at 28 degrees north latitude. The use area is 1200m ² and the service life is 5 years.

Application example three

The composition of PVC raw materials and other 11 raw materials are: 60 parts of PVC raw materials; 16 parts of light calcium powder; 7 parts of heavy calcium powder; 4 parts of complex calcium-zinc stabilizer; 3 parts of titanium dioxide; 1.5 parts of zinc oxide; 1.5 parts of n-octyl ester; 0.5 parts of stearic acid; 0.4 parts of butyl stearate; 2 parts of aluminum silicate; 1.5 parts of ACR; 5 parts of CPE.

The other structure is consistent with the above description, and is applied to the Sanya farm in Hainan, 17 degrees north latitude, with an area of 1800 m ² and a service life of 5 years.

After the pilot test in 5 years and 12 regions of the present invention, according to the geographical and climatic characteristics of different latitude regions, the implementation projects of the present invention are randomly selected in the tropical low latitudes of Sanya, Hainan at 17 degrees north latitude; Three sub-soil sampling areas in the Jiaxing subtropical warm temperate zone of Zhejiang Province with a latitude of 28 degrees north latitude and 47 degrees Celsius in the Hulunbeier temperate zone of Inner Mongolia After on-the-spot observation and analysis, several satisfactory scientific and technological experiments were obtained: 1 to 5 years of outdoor anti-corrosion application and laboratory test data comparison, found that the adjustment of PVC-based formula, with grafted EPDM The effectiveness of the roofing of the resin copolymer spray coating has proven to be fully compliant for 20 years. 2, compared with the metal corrugated color plate of sandblasting anti-corrosion paint, the effect of heat preservation and cold protection is greatly enhanced, and the energy consumption of the harsh winter heat regulation is reduced. 3. From the comparison of the cost performance of the products from construction to application, it is confirmed that the products of the invention have comprehensive market competitive advantages. 4. The present invention proposes three kinds of aggregate formulations which are mainly used for adjusting the PVC and 11 kinds of ingredients for the three geographical climatic zones, and the expected application effects are obtained, especially in the tropical and cold temperate regions.

The first invention completes the process from science to product, multi-disciplinary talent cooperation and more than 5 years. Second, after the product is used, it can be completely recycled and reused. The production process is highly automated and there is no “three wastes” problem. Third, the market has a wide range of applicability, especially in China, except for the sandblasted double-plated and sprayed steel corrugated color roof (about 40 yuan per square meter), and other similar building materials and technologies are almost incomparable. Even in facility agriculture, aquaculture, and eco-environmental industries, there is a huge market prospect.

The above is only a specific embodiment of the present invention, but the design concept of the present invention is not limited thereto, and any insubstantial modification of the present invention by this concept should be an infringement of the scope of protection of the present invention.

Claims

The double-layer hollow isosceles trapezoidal multifunctional resin house cover comprises a roof cover body, wherein the roof cover body comprises a double-layer hollow trapezoidal upper bottom plate, a double-layer hollow trapezoidal waist plate and a double-layer hollow trapezoidal shape. a lower bottom plate, the upper bottom plate, the waist plate, the lower bottom plate and the waist plate are sequentially and repeatedly connected to form a undulating continuous structure, and the double bottom hollow structure of the upper bottom plate, the waist plate and the lower bottom plate is provided with a reinforcing rib; a planar area of the upper bottom plate and The ratio of the planar area of the lower base plate is 1:1.5-2.5; the angle between the waist plate and the plane of the upper bottom plate or the lower bottom plate is 38-42°.
The double-layered hollow isosceles trapezoidal multifunctional resin house cover according to claim 1, wherein a surface of the roof cover body is sprayed with a graft-type modified ethylene propylene diene resin copolymer. The composition of the graft-type modified ethylene propylene diene resin copolymer was as follows: 33 wt% of polyacrylate, 35 wt% of acrylonitrile, and 32 wt% of styrene.
The double-layer hollow isosceles trapezoidal multifunctional resin house cover according to claim 1, wherein the weight of the aggregate of the roof cover body is as follows: 60-71 parts of PVC raw material; light calcium powder 14- 16 parts; 5-7 parts of heavy calcium powder; 3-4 parts of complex calcium-zinc stabilizer; 1-3 parts of titanium dioxide; 0.5-1.5 parts of zinc oxide; 0.8-1.5 parts of di-n-octyl phthalate; Acid 0.3-0.5 parts; butyl stearate 0.2-0.4 parts; aluminum silicate 0.5-2 parts; ACR 1.2-1.5 parts; CPE 4-5 parts.
The double-layer hollow isosceles trapezoidal multifunctional resin house cover according to claim 1 or 2 or 3, wherein the thickness of the single layer in the double bottom structure of the upper bottom plate, the waist plate and the lower bottom plate is 1.1-2.5 Mm, the distance between the two single layers in the double bottom structure of the upper bottom plate, the waist plate and the lower bottom plate is 8-20 mm, the thickness of the reinforcing rib is 0.6-2.5 mm, the upper surface of the upper bottom plate and the lower bottom plate The vertical distance between the surfaces is 35-60 mm, and the horizontal distance between the center of the upper bottom plate and the center of the adjacent lower bottom plate is 70-85 mm.
The double-layered hollow isosceles trapezoidal multifunctional resin house cover according to claim 1 or 2 or 3, wherein the upper bottom plate, the waist plate, the lower bottom plate and the waist plate are sequentially and repeatedly connected to form a single piece of the house. The length of the cover body is 500-1500 mm.
The double-layered hollow isosceles trapezoidal multifunctional resin house cover according to claim 5, wherein the two ends of the single-piece roof cover body are respectively extended to form adjacent two roof cover connections. The upper butt cantilever and the lower butt cantilever are stacked on each other when joined to form a structure conforming to the undulating continuous structure of the roof cover body.
The double-layer hollow isosceles trapezoidal multifunctional resin house cover according to claim 6, wherein a side of the upper butt cantilever and the lower butt cantilever are superposed with a concave-convex positioning column groove structure.
The double-layer hollow isosceles trapezoidal multifunctional resin house cover according to claim 6, wherein the overall thickness of the upper butt cantilever and the lower butt cantilever is ≥ the thickness of the roof cover body.
The double-layer hollow isosceles trapezoidal multifunctional resin house cover according to claim 6, wherein the upper butt cantilever and the lower butt cantilever are sequentially upward, parallel and downward from the waist plate of the roof cover body. Extended formation.
The double-layer hollow isosceles trapezoidal multifunctional resin house cover according to claim 1 or 2 or 3, wherein the reinforcing rib is a vertical reinforcing rib or an equilateral triangular reinforcing rib.