Existing building reinforcement-heat storage composite material based on distributed new energy as well as preparation method and application of existing building reinforcement-heat storage composite material

Abstract

The invention provides an existing building reinforcement-heat storage composite material based on distributed new energy and a preparation method and application thereof, and belongs to the technical field of composite materials. The composite material comprises a C-shaped FRP plate, a geopolymer stiffening plate capable of storing heat and an FRP connecting piece, and the geopolymer stiffening plate capable of storing heat is arranged in a C-shaped opening of the C-shaped FRP plate in the length direction of the C-shaped FRP plate in a full-length mode and connected with the C-shaped FRP plate 1 in a fastened mode through the FRP connecting piece; the geopolymer stiffening plate capable of storing heat is used for reinforcing the strength of the C-shaped FRP plate and storing redundant heat energy generated in the charging and discharging process of the distributed new energy equipment. The composite material provided by the invention has building reinforcement and heat storage effects, and solves the problems of adverse effects of distributed new energy on building strength and heat loss caused by energy charging and discharging.

Description

Technical Field

[0001] The present invention belongs to the technical field of composite materials, and in particular relates to an existing building reinforcement-heat storage composite material based on distributed new energy, and a preparation method and application thereof. Background Art

[0002] With the global emphasis on sustainable development and low-carbon economy, distributed new energy (such as solar energy, wind energy, etc.) has gradually become an important energy solution. However, after installing distributed new energy equipment, existing buildings often face the problem of insufficient structural strength, which not only affects the safety of the building, but also increases the cost of renovation and reinforcement. Therefore, it is particularly important to effectively reinforce these buildings to ensure that they can adapt to the new energy structure. In addition, distributed new energy equipment will generate excess heat energy during the charging and discharging process, but there is a lack of effective energy storage solutions to temporarily store this heat energy, which reduces the overall energy utilization efficiency. Therefore, the development of a new type of reinforcement-heat storage composite material can achieve heat storage while improving the structural strength of the building, which is of great significance to promoting the sustainable development of distributed new energy. Summary of the invention

[0003] The purpose of the present invention is to provide an existing building reinforcement-heat storage composite material based on distributed new energy, and a preparation method and application thereof.

[0004] The technical solution adopted by the present invention is: A distributed new energy-based reinforcement-heat storage composite material for existing buildings, comprising a C-type FRP plate, a heat storage geopolymer stiffening plate and an FRP connector. The heat storage geopolymer stiffening plate is arranged in a C-type opening of the C-type FRP plate along the length direction of the C-type FRP plate and is fastened to the C-type FRP plate 1 through the FRP connector; the heat storage geopolymer stiffening plate is used to strengthen the strength of the C-type FRP plate and store excess heat energy generated by distributed new energy equipment during charging and discharging.

[0005] Furthermore, the FRP connector is embedded in the reserved holes of the C-shaped FRP plate and the heat storage geopolymer stiffening plate, and epoxy resin is poured into the reserved holes.

[0006] Furthermore, the height of the heat storage geopolymer stiffening plate is the same as the height of the web of the C-type FRP plate, and the thickness of the heat storage geopolymer stiffening plate is equal to 1.2 to 1.5 times the thickness of the web of the C-type FRP plate.

[0007] Furthermore, the FRP connector consists of a nut and a screw, a thread is arranged on the screw, the thickness of the nut is the same as the flange thickness of the C-type FRP plate, the diameter of the nut is not less than the thickness of the heat storage geopolymer stiffening plate, the length of the screw is 3 to 3.3 times the flange thickness of the C-type FRP plate, and the diameter of the screw is 0.5 times the thickness of the heat storage geopolymer stiffening plate.

[0008] Furthermore, the thermal conductivity of the C-type FRP plate is 1.15~1.35 W / (m·K), the specific heat capacity of the heat storage geopolymer stiffening plate is 1000~1350 J / (kg·K), and the thermal conductivity is 0.85~1.2W / (m·K).

[0009] Furthermore, the C-type FRP plate is made of continuous fiber reinforced epoxy resin and is integrally formed by a pultrusion process. The volume content of the continuous fiber is 45% to 55% vol of the total volume of the C-type FRP plate. The continuous fiber is at least one of basalt fiber, carbon fiber and glass fiber.

[0010] Furthermore, the heat storage geopolymer stiffening plate is formed by casting the heat storage geopolymer through a steel mold, and the heat storage geopolymer comprises the following components in parts by weight: Colloid 0.35~0.4 parts; 0.3~0.35 parts of fine aggregate; 0.05~0.1 parts of foam microspheres; 0.2~0.25 parts of water; The colloid consisted of 20% of ordinary Portland cement and 80% of a commercial Slovak geopolymer powder, Považská Cementáreň.

[0011] Furthermore, the FRP connector is made of continuous fiber reinforced epoxy resin by pultrusion-thread cutting-compression molding, the volume content of the continuous fiber is 20%~25%vol of the FRP connector, and the continuous fiber is at least one of basalt fiber, carbon fiber and glass fiber.

[0012] Any one of the above-mentioned methods for preparing the existing building reinforcement-heat storage composite material based on distributed new energy comprises the following steps: (1) Preparation of C-type FRP plates; The continuous glass fiber is impregnated in epoxy resin through a continuous traction device; the continuous fiber impregnated with the resin is initially formed in a C-shaped hollow mold by tension, and heated and cured in the mold; after the curing is completed, the C-shaped FRP plate is pulled out of the mold, the profile is cut into the required length, and a reserved hole is drilled in the middle of the flange by a CNC machine tool to obtain a C-shaped FRP plate; (2) Preparation of geopolymer stiffening panels capable of storing heat: Using a mechanical mixer to mix silicate cement, geopolymer powder, fine aggregate, foam beads and water evenly to obtain heat storage geopolymer slurry; injecting the slurry into a moldable steel mold, demolding after solidification, cutting the profile into required lengths, and drilling a reserved hole in the middle of the stiffening plate with a CNC machine tool to obtain a heat storage geopolymer stiffening plate; (3) Preparation of FRP connectors; The continuous glass fiber is impregnated in epoxy resin through a continuous traction device; the continuous fiber impregnated with resin is initially formed in a C-shaped hollow mold by tension, and heated and cured in the mold; after the curing is completed, the FRP screw is pulled out of the mold, and the thread is cut on the surface of the screw by a CNC machine tool; then, the screw is placed in a steel mold with a nut groove model, epoxy resin is injected into the nut groove, and heated and cured again; after the curing is completed, an FRP rod body with a nut can be obtained; the profile is cut according to the designed length to obtain an FRP connector; (4) Assembly First, place the heat storage geopolymer stiffening plate in the middle of the flange of the C-type FRP plate, align the reserved holes of the two, and insert the FRP connector into each reserved hole to fix the position of the heat storage geopolymer stiffening plate; then inject epoxy resin into the reserved holes of the upper flange of the C-type FRP plate. After curing, turn the C-type FRP plate upside down and inject epoxy resin into the reserved holes of the lower flange. After curing, the existing building reinforcement-heat storage composite material based on distributed new energy is obtained.

[0013] Application of any of the above-mentioned existing building reinforcement-heat storage composite materials based on distributed new energy in reinforcing existing distributed new energy buildings.

[0014] Beneficial effects of the present invention: The composite material provided by the present invention has both building reinforcement and heat storage functions, and at the same time solves the adverse effects of distributed renewable energy on building strength and the problem of heat loss caused by energy charging and discharging; in addition, the C-type FRP plate and the heat-storage geopolymer stiffening plate in the composite material are detachable. After the heat-storage geopolymer stiffening plate is damaged or cannot perform the heat storage function, it can be removed and replaced with a new heat-storage geopolymer stiffening plate. The removed geopolymer stiffening plate can be used as slope soil solidification filler after mechanical crushing, and almost no environmental pollution will be generated. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a structural diagram of the existing building reinforcement-heat storage composite material of the present invention.

[0016] Figure 2 This is a structural diagram of the FRP connector of the present invention.

[0017] Figure 3 This is the architectural plan (1:150) of a steel structure factory building in the application example.

[0018] Figure 4 It is a schematic diagram of the heat storage and heat conduction structure of the existing building reinforcement-heat storage composite material of the present invention. DETAILED DESCRIPTION

[0019] See also Figure 1 and Figure 2 The present invention provides an existing building reinforcement-heat storage composite material based on distributed new energy, including a C-type FRP plate 1, a heat storage geopolymer stiffening plate 2 and an FRP connector 3. The C-type FRP plate 1 is composed of a web and upper and lower flanges, and the web and the upper and lower flanges form a C-shaped opening. The heat storage geopolymer stiffening plate 2 is arranged in the C-shaped opening along the length direction of the C-type FRP plate 1. The upper side and lower side of the heat storage geopolymer stiffening plate 2 are respectively attached to the upper surface and lower surface of the upper and lower flanges of the C-type FRP plate, and are fastened to the C-type FRP plate 1 through the FRP connector 3. The FRP connector 3 is embedded in the reserved holes of the C-type FRP plate and the heat storage geopolymer stiffening plate 2, and the reserved holes are poured with epoxy resin.

[0020] The height of the heat storage geopolymer stiffening plate 2 is the same as the height of the web of the C-type FRP plate 1, and the thickness of the heat storage geopolymer stiffening plate is equal to 1.2 to 1.5 times the thickness of the web of the C-type FRP plate.

[0021] The FRP connector consists of a nut 31 and a screw 32. The screw 32 is provided with threads. The thickness of the nut is the same as the flange thickness of the C-type FRP plate. The diameter of the nut is not less than the thickness of the heat storage geopolymer stiffening plate. The length of the screw is 3 to 3.3 times the flange thickness of the C-type FRP plate. The diameter of the screw is 0.5 times the thickness of the heat storage geopolymer stiffening plate. Example 1

[0022] The geometric dimensions of the reinforced heat storage composite material A and the C-type FRP plate are 152mm×228mm×11mm (width×height×wall thickness); the geometric dimensions of the heat storage geopolymer stiffening plate 2 are: 206mm×16.5mm (height×width); the geometric dimensions of the FRP connector are: nut diameter 18mm, nut thickness 11mm; screw diameter 8.25mm, screw length 33mm; the length of the continuous fiber reinforced part is 44mm and the diameter is 8.25mm. The heat storage geopolymer stiffening plate 2 is placed in the middle of the upper and lower flanges of the C-type FRP plate and is fastened to the C-type FRP plate 1 through the FRP connector 3.

[0023] The preparation method of the reinforcement-heat storage composite material A is as follows: (1) Preparation of C-type FRP plate 1, fiber volume fraction = 55%.

[0024] (1.1) Material preparation: Components by weight of continuous fiber coarse sand reinforced epoxy resin: Continuous glass fiber 2.6 parts, density 2.6g / cm 3 ; 1.0 part of vinyl epoxy resin, density 1.2g / cm 3 .

[0025] (1.2) The continuous glass fiber is impregnated with vinyl epoxy resin by a continuous traction device; the resin-impregnated continuous fiber is initially formed in a C-type hollow mold (the hollow part of the hollow mold is consistent with the geometric dimensions of the C-type FRP plate to be prepared) by tension, and heated and cured in the mold; after curing, the C-type FRP plate is pulled out of the mold, the profile is cut into the required length, and a reserved hole (diameter 8.65mm) is drilled in the middle of the flange using a CNC machine tool, the number of which is 3 per meter.

[0026] (2) Preparation of geopolymer stiffening panels capable of storing heat (2.1) Material preparation, weight composition of heat storage geopolymer: 0.4 parts of colloid: including 20% ​​ordinary Portland cement powder (R32.5) and 80% geopolymer powder (purchased from Považská Cementáreň); 0.3 parts of fine aggregate: steel slag particles with a diameter of 0.075~2mm; 0.05 parts of foam microbeads: particle size is 10~250μm, wall thickness is 1~2μm; 0.25 parts of water: Use municipal tap water.

[0027] (2.2) Use a mechanical mixer to uniformly stir 0.4 parts of colloid, 0.3 parts of fine aggregate and 0.05 parts of foam beads at 350 rpm for 1 minute to obtain a dry powder; then add 0.25 parts of water to the dry powder and uniformly stir at 750 rpm for 1 minute and 30 seconds to obtain an initial uniform slurry; after the slurry is allowed to stand for 1 minute, it is uniformly stirred at rpm for 2 minutes to obtain the final heat storage geopolymer slurry; finally, the slurry is injected into a moldable steel mold (height 206mm×16.5mm), cured at 120℃ and 0.80MPa for 4 hours, and demolded after curing; cut the profiles to the required length, and use a CNC machine tool to drill reserved holes (diameter 8.65mm, length 33.4mm) in the middle of the stiffening plate, with a quantity of 3 holes per meter.

[0028] (3) Preparation of FRP connector 3, fiber volume fraction 25%; (3.1) Material preparation, weight components of continuous fiber coarse sand reinforced epoxy resin: 1 part of glass fiber, density is 2.6g / cm 3 ; 1.25 parts of vinyl epoxy resin, density 1.2g / cm 3 .

[0029] (3.2) First, the continuous glass fiber is impregnated with polyethylene resin through a continuous traction device; the continuous fiber impregnated with resin is initially formed in a circular hollow mold (the hollow part of the hollow mold is consistent with the geometric size of the FRP screw) through tension, and heated and cured in the mold; after the curing is completed, the FRP screw is pulled out of the mold, and a 0.2mm thread is cut on the surface of the screw using a CNC machine tool; then, the screw is placed in a steel mold with a nut groove model, and vinyl epoxy resin is injected into the nut groove, and heated and cured again; after the curing is completed, an FRP rod body with a nut can be obtained; the profile is cut according to the designed length.

[0030] (4) Assembly First, place the heat storage geopolymer stiffening plate 2 in the middle of the flange of the C-type FRP plate 1, align the reserved holes of the two, and insert the FRP connector 3 into each reserved hole to fix the position of the heat storage geopolymer stiffening plate 2; then inject vinyl resin into the reserved holes on the upper flange of the C-type FRP plate, and cure it at room temperature for 24 hours; then, turn the C-type FRP plate upside down, and inject vinyl resin into the reserved holes on the lower flange, and cure it at room temperature for 24 hours; after the curing is completed, the existing building reinforcement-heat storage composite material A based on distributed new energy is obtained.

[0031] The thermal conductivity of the C-type FRP plate 1 of the reinforcement-thermal storage composite material A is 1.25 W / (m·K); the specific heat capacity of the geopolymer thermal storage stiffener 2 is 1000 (J / (kg·K)), the thermal conductivity is 1.2W / (m·K), and the density is 1.9g / cm 3 The tensile strength of the composite material is 1500MPa, and the bending strength is 500MPa, without buckling failure. Example 2

[0032] Reinforcement-heat storage composite material B, the geometric dimensions of the C-type FRP plate 1 are 100mm×300mm×10mm (width×height×wall thickness), and the geometric dimensions of the heat storage geopolymer stiffening plate 2 are: 280mm×16.5mm (height×width); the geometric dimensions of the FRP connector are: nut diameter 16mm, nut thickness 10mm; screw diameter 7.5mm, screw length 30mm; the length of the continuous fiber reinforced part is 40mm and the diameter is 7.5mm. The heat storage geopolymer stiffening plate 2 is placed in the middle of the upper and lower flanges of the C-type FRP plate and is fastened to the C-type FRP plate 1 through the FRP connector 3.

[0033] The preparation method of the reinforcement-heat storage composite material B is as follows: (1) Preparation of C-type FRP plate 1, fiber volume fraction = 50%; (1.1) Material preparation: Components by weight of continuous fiber coarse sand reinforced epoxy resin: 1.8 parts of basalt fiber, density 2.1g / cm 3 ; 1.0 part of vinyl epoxy resin, density 1.2g / cm 3 . (1.2) A C-type FRP plate 1 was prepared in the same manner as in Example 1. After demoulding, the profile was cut into the required length and a reserved hole (diameter 7.9 mm) was drilled in the middle of the flange using a CNC machine tool. The number of holes was 4 per meter.

[0034] (2) Preparation of geopolymer stiffening panels capable of storing heat (2.1) Material preparation, weight composition of heat storage geopolymer: 0.39 parts of colloid: including 20% ​​ordinary Portland cement powder (R52.5) ​​and 80% geopolymer powder (purchased from Považská Cementáreň); 0.33 parts of fine aggregate: steel slag particles with a diameter of 0.075~2mm; 0.08 parts of foam microbeads: particle size is 10~250μm, wall thickness is 1~2μm; 0.20 parts of water: Use municipal tap water.

[0035] (2.2) The same method as in Example 1 was used to prepare the profiles. After demoulding, the profiles were cut into the required lengths, and a CNC machine was used to drill reserved holes (7.9 mm in diameter and 30 mm in length) in the middle of the stiffening plate. The number of holes was 4 per meter.

[0036] (3) Preparation of FRP connector 3, fiber volume fraction 23%; (3.1) Material preparation, weight components of continuous fiber coarse sand reinforced epoxy resin: 0.63 parts of glass fiber, density is 2.1g / cm3; 2 parts of vinyl epoxy resin, density 1.2g / cm3. (3.2) Prepare FRP connector 3 using the same method as in Example 1.

[0037] (4) The same method as in Example 1 is used for assembly to obtain a reinforcement-heat storage composite material B.

[0038] The thermal conductivity of the C-type FRP plate 1 of the reinforcement-thermal storage composite material B is 1.15W / (m·K); the specific heat capacity of the geopolymer thermal storage stiffener 2 is 1200 (J / (kg·K)), the thermal conductivity is 1.01W / (m·K), and the density is 1.7g / cm3 The tensile strength of the composite material is 1350MPa, and the bending strength is 440MPa, without buckling failure. Example 3

[0039] Reinforcement-heat storage composite material C, the geometric dimensions of the C-type FRP plate 1 are 100mm×200mm×9mm (width×height×wall thickness), and the geometric dimensions of the heat storage geopolymer stiffening plate 2 are: 182mm×16.5mm (height×width); the nut diameter is 15mm, the nut thickness is 9mm; the screw diameter is 6.75mm, and the screw length is 27mm. The length of the continuous fiber reinforced part is 36mm and the diameter is 6.75mm. The heat storage geopolymer stiffening plate 2 is placed in the middle of the upper and lower flanges of the C-type FRP plate and is fastened to the C-type FRP plate 1 through the FRP connector 3.

[0040] The preparation method of the reinforcement-heat storage composite material C is as follows: (1) Preparation of C-type FRP plate 1, fiber volume fraction = 45%; (1.1) Material preparation: Components by weight of continuous fiber coarse sand reinforced epoxy resin: 1.2 parts of carbon fiber, density 1.8g / cm 3 ; 1.0 part of vinyl epoxy resin, density 1.2g / cm 3 .

[0041] (1.2) A C-shaped FRP plate 1 was prepared in the same manner as in Example 1. After demoulding, the profile was cut into the required length, and a reserved hole (diameter 7.15 mm) was drilled in the middle of the flange using a CNC machine tool, with a number of 3 holes per meter.

[0042] (2) Preparation of geopolymer stiffening panels capable of storing heat (2.1) Material preparation, weight composition of heat storage geopolymer: 0.35 parts of colloid: including 20% ​​ordinary Portland cement powder (R32.5) and 80% geopolymer powder (purchased from Považská Cementáreň); 0.31 parts of fine aggregate: steel slag particles with a diameter of 0.075~2mm; 0.1 part of foam microbeads: particle size is 10~250μm, wall thickness is 1~2μm; 0.24 parts of water: Use municipal tap water.

[0043] (2.2) The same method as in Example 1 was used to prepare the profile. After demoulding, the profile was cut into the required length, and a reserved hole 21 (diameter 7.15 mm, length 27.4 mm) was drilled in the middle of the stiffening plate using a CNC machine tool. The number was 3 holes / meter.

[0044] (3) Preparation of FRP connector 3, fiber volume fraction 20%; (3.1) Material preparation, weight components of continuous fiber coarse sand reinforced epoxy resin: 0.44 parts of glass fiber, density is 1.8g / cm3, 1 part of vinyl epoxy resin, density is 1.2g / cm3. (3.2) Prepare FRP connector 3 using the same method as in Example 1.

[0045] (4) The same method as in Example 1 is used for assembly to obtain a reinforcement-heat storage composite material B.

[0046] The thermal conductivity of the C-type FRP plate 1 of the reinforcement-thermal storage composite material C is 1.35W / (m·K); the specific heat capacity of the geopolymer thermal storage stiffener 2 is 1350 J / (kg·K), the thermal conductivity is 0.89W / (m·K), and the density is 1.6g / cm 3 The tensile strength of the composite material is 1700MPa, and the flexural strength is 650MPa, without buckling failure. Application Example 1

[0047] A steel structure factory building was selected. The factory building was built in 2009. The structure is a rack structure with a construction area of ​​about 7032.5m 2 , the eaves height of the building is 9.15m, and the roof slope is 2.862°. There is one 5t bridge crane for each span of the A~C axis / D~E axis of the factory building, which is an A5 working system. The safety level of the building structure is level two, the service life is 50 years, the importance coefficient is 1.0, and the seismic level is level four. The design basis of the original structure includes the Building Structure Load Code (GB 50009-2012), the Technical Code for Cold-bent Thin-walled Steel Structure (GB 50018-2002) and the Technical Code for Portal Frame Light House Steel Structure (GB51022-2015). Its building plan is as follows Figure 3 As shown. The purlin of this structure is C-shaped cold-formed steel with specifications of C200×70×20×2, a net section coefficient of 1.000, and a steel model of Q235. The loads imposed on the structure include: Constant and live load: Roof deadweight = 0.41kN / m 2 , live load = 0.5kN / m 2 ; Wind load: basic wind pressure = 0.4 kN / m 2 , wind pressure adjustment coefficient = 1.5, wind load height variation coefficient = 1.000, wind load coefficient (wind suction) = -1.08, wind load coefficient (wind pressure) = 0.38, wind load standard value (wind suction) = -0.648 kN / m 2, standard value of wind load (wind pressure) = 0.228 kN / m 2 ; Other loads: Snow load = 0.75kN / m 2 , dust accumulation load = 0, maintenance load = 1kN.

[0048] The roof of the factory building now needs to build a 0.8W distributed photovoltaic power generation project. The addition of new photovoltaic panels will increase the roof load, which is no more than 0.16kN / m 2 After adding the photovoltaic support panels, the maximum strength of the purlins of the original structure was 369.57MPa, far exceeding the maximum strength allowed by Q235 steel purlins (215MPa).

[0049] The span of the original structural purlin is 6.0m, and the purlin spacing is 1.5m. Now the purlin spacing is reduced by 1.0m, and the additional purlins adopt the reinforcement-heat storage composite material A in Example 1.

[0050] After testing, compared with the original structure, the internal stress of the purlins densified with the reinforcement-heat storage composite material A in Example 1 is greatly reduced, and its maximum stress is reduced from 369.57 MPa to 186.3 MPa, which can solve the problem of insufficient purlin strength.

[0051] Heat exchangers are installed at both ends of the reinforcement-thermal storage composite material A, the first heat exchanger is connected to the distributed photovoltaic power generation project, and the second heat exchanger is connected to the heating equipment. The heat storage capacity of the reinforcement-thermal storage composite material is the amount of waste heat generated by the photovoltaic power generation equipment within one month.

Claims

1. An existing building reinforcement-heat storage composite material based on distributed new energy, characterized in that: It comprises a C-shaped FRP plate (1), a heat storage geopolymer stiffening plate (2) and an FRP connector (3), wherein the heat storage geopolymer stiffening plate (2) is arranged in a C-shaped opening of the C-shaped FRP plate (1) along the length direction of the C-shaped FRP plate (1) and is fastened to the C-shaped FRP plate 1 via the FRP connector (3); The heat storage geopolymer stiffening plate (2) is used to strengthen the strength of the C-type FRP plate (1) and store excess heat energy generated by distributed new energy equipment during the charging and discharging process.

2. According to claim 1, a composite material for strengthening and storing heat in existing buildings based on distributed new energy, characterized in that: The FRP connector (3) is embedded in the reserved holes of the C-shaped FRP plate (1) and the heat storage geopolymer stiffening plate (2), and epoxy resin is poured into the reserved holes.

3. According to claim 1, the existing building reinforcement-heat storage composite material based on distributed new energy is characterized in that: The height of the heat storage geopolymer stiffening plate (2) is the same as the height of the web of the C-shaped FRP plate (1), and the thickness of the heat storage geopolymer stiffening plate (2) is 1.2 to 1.5 times the thickness of the web of the C-shaped FRP plate (1).

4. According to claim 2 or 3, a composite material for strengthening and storing heat in existing buildings based on distributed new energy, characterized in that: The FRP connector (3) is composed of a nut and a screw rod. The screw rod is provided with threads. The thickness of the nut is the same as the flange thickness of the C-shaped FRP plate (1). The diameter of the nut is not less than the plate thickness of the heat storage geopolymer stiffening plate (2). The length of the screw rod is 3 to 3.3 times the flange thickness of the C-shaped FRP plate (1). The diameter of the screw rod is 0.5 times the plate thickness of the heat storage geopolymer stiffening plate (2).

5. According to claim 1, the existing building reinforcement-heat storage composite material based on distributed new energy is characterized in that: The thermal conductivity of the C-type FRP plate (1) is 1.15-1.35 W / (m·K), the specific heat capacity of the heat storage geopolymer stiffening plate (2) is 1000-1350 J / (kg·K), and the thermal conductivity is 0.85-1.2 W / (m·K).

6. According to claim 1, the existing building reinforcement-heat storage composite material based on distributed new energy is characterized in that: The C-type FRP plate (1) is made of continuous fiber reinforced epoxy resin and is integrally formed by a pultrusion process, wherein the volume content of the continuous fiber is 45% to 55% volume of the total volume of the C-type FRP plate, and the continuous fiber is at least one of basalt fiber, carbon fiber and glass fiber.

7. According to claim 1, the existing building reinforcement-heat storage composite material based on distributed new energy is characterized in that: The heat storage geopolymer stiffening plate (2) is formed by casting the heat storage geopolymer through a steel mold. The heat storage geopolymer comprises the following components in parts by weight: Colloid 0.35~0.4 parts; 0.3~0.35 parts of fine aggregate; 0.05~0.1 parts of foam microspheres; 0.2~0.25 parts of water; The colloid consisted of 20% of ordinary Portland cement and 80% of a commercial Slovak geopolymer powder, Považská Cementáreň.

8. According to claim 1, the existing building reinforcement-heat storage composite material based on distributed new energy is characterized in that: FRP connector (3) The FRP connector is made of continuous fiber reinforced epoxy resin and is obtained by pultrusion-thread cutting-molding. The volume content of the continuous fiber is 20% to 25% vol of the total volume of the FRP connector. The continuous fiber is at least one of basalt fiber, carbon fiber and glass fiber.

9. A method for preparing a composite material for strengthening and storing heat of existing buildings based on distributed new energy as claimed in any one of claims 1 to 8, characterized in that: The following steps are involved: (1) preparing a C-type FRP plate (1); The continuous glass fiber is impregnated in epoxy resin through a continuous traction device; the continuous fiber impregnated with the resin is initially formed in a C-shaped hollow mold by tension, and heated and cured in the mold; after the curing is completed, the C-shaped FRP plate is pulled out of the mold, the profile is cut into the required length, and a reserved hole is drilled in the middle of the flange by a CNC machine tool to obtain a C-shaped FRP plate; (2) Preparation of heat storage geopolymer stiffening plate (2): Using a mechanical mixer to mix silicate cement, geopolymer powder, fine aggregate, foam beads and water evenly to obtain heat storage geopolymer slurry; injecting the slurry into a moldable steel mold, demolding after solidification, cutting the profile into required lengths, and drilling a reserved hole in the middle of the stiffening plate with a CNC machine tool to obtain a heat storage geopolymer stiffening plate; (3) preparing FRP connector (3); The continuous glass fiber is impregnated in epoxy resin through a continuous traction device; the continuous fiber impregnated with resin is initially formed in a C-shaped hollow mold by tension, and heated and cured in the mold; after the curing is completed, the FRP screw is pulled out of the mold, and the screw surface is cut out with a CNC machine tool; then, the screw is placed in a steel mold with a nut groove model, epoxy resin is injected into the nut groove, and heated and cured again; after the curing is completed, an FRP rod body with a nut can be obtained; the profile is cut according to the designed length to obtain an FRP connector; (4) Assembly First, a heat storage geopolymer stiffening plate (2) is placed in the middle of the flange of the C-shaped FRP plate (1) so that the reserved holes of the two are aligned, and an FRP connector (3) is inserted into each reserved hole to fix the position of the heat storage geopolymer stiffening plate (2); then, epoxy resin is injected into the reserved holes of the upper flange of the C-shaped FRP plate (1); after curing, the C-shaped FRP plate is inverted, and epoxy resin is injected into the reserved holes of the lower flange; after curing, an existing building reinforcement-heat storage composite material based on distributed new energy is obtained.

10. Application of the existing building reinforcement-heat storage composite material based on distributed new energy as described in any one of claims 1 to 8 in reinforcing existing buildings based on distributed new energy.

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