Fiberboard, method of manufacture and building structural reinforcement system comprising same

Abstract

The present application relates to the technical field of building structure reinforcement, in particular to a fiber plate, a preparation method and a building structure reinforcement system comprising the same. The fiber plate provided by the present application comprises a composite cured heat-conducting layer and a heat-insulating layer. The heat-insulating layer is formed by pressing and curing a first fiber fabric layer and a resin system B, and the heat-conducting layer is formed by pressing and curing an electric heating net, a second fiber fabric layer and a resin system D. The raw materials of the resin system D include heat-conducting fillers, resin and a curing agent. The fiber plate has a relatively small thickness, can be stored in a rolled state, does not need to be temporarily ordered and is convenient to transport. The heating function of the fiber plate can make the reinforcement effect of the fiber plate no longer be constrained and affected by the external temperature. The preparation method of the fiber plate is simple and easy to realize large-scale production. When the fiber plate is applied to the building structure reinforcement system, the winding mode can be used, which significantly improves the construction convenience.

Description

Technical Field

[0001] This invention relates to the field of building structure reinforcement technology, specifically to a fiberboard, a preparation method, and a building structure reinforcement system comprising the same. Background Technology

[0002] With the rapid development of my country's economy, the number of construction facilities in the country is also growing rapidly. Bridges, as one of my country's major transportation infrastructures, are of paramount importance for safe use. However, bridge piles are easily corroded due to prolonged contact with water, and the critical load-bearing components of corroded piles are easily damaged, potentially leading to the collapse of part or all of the bridge structure. Therefore, reinforcing the surface of bridge piles is the main current method to solve this problem.

[0003] Traditional reinforcement techniques include installing steel sleeves on the exterior of corroded or damaged structures, pouring reinforced concrete protective layers, or bonding fiber composite materials. However, these methods all have drawbacks such as high requirements for the flatness of the base surface, inconvenience of underwater construction, heavy weight, and short service life against corrosion. Therefore, fiber sleeve reinforcement systems, with their advantages of high strength, light weight, and good corrosion resistance, are increasingly being applied to the reinforcement of building structures such as piles and columns.

[0004] Currently, the fiberboard used to make fiber sleeves is limited by existing production processes, with a thickness ranging from 3 to 13 mm, and a commonly used thickness of 5 mm. Thicker fiberboard exhibits greater tensile strength when bent into sleeves to wrap around the pile surface, increasing the difficulty of on-site construction. Furthermore, since the dimensions of each pile vary, the required size of the fiber sleeve for reinforcement also differs. Therefore, considering both reinforcement effectiveness and economic costs, fiber sleeves are currently mostly custom-made according to the actual reinforcement needs, but this prolongs the reinforcement operation time. When the pile to be reinforced is large, the size of the fiberboard or fiber sleeve to be manufactured also increases, further increasing transportation difficulties; when the pile to be reinforced is small, thicker fiberboard is difficult to install. Moreover, because thicker fiberboard exhibits greater tensile strength after bending, stainless steel nails are required at the fiberboard overlaps to complete the connection. However, the use of stainless steel nails can easily create gaps, allowing water or moisture to seep into the grouting material inside the fiber sleeve or into the pile, causing corrosion and shortening the reinforcement life of the fiber sleeve. Furthermore, since the required reinforcement time for piles is not fixed, when reinforcement work is carried out under low-temperature conditions, the grouting material used is prone to excessive viscosity, slow curing, or even freeze-thaw cycles, severely reducing the reinforcement effect. Therefore, the currently used fiberboard still has considerable room for improvement. Summary of the Invention

[0005] In view of this, the present invention provides a fiberboard, a preparation method, and a building structure reinforcement system including the fiberboard. The fiberboard has a heating function, so that the grouting reinforcement effect is no longer constrained or affected by the external temperature, and the thickness is relatively thin, which can realize pre-mass production. The preparation method has simple steps and is easy to achieve large-scale production. The construction convenience of the building structure reinforcement system including the fiberboard is significantly improved.

[0006] To solve the above technical problems, a first aspect of the present invention provides a fiberboard comprising a composite-cured thermally conductive layer and a thermal insulation layer; the thermal insulation layer is formed by pressing and curing a first fiber fabric layer and a resin system B.

[0007] The thermally conductive layer is formed by pressing and curing an electric heating mesh, a second fiber fabric layer, and a resin system D. The raw materials of the resin system D include thermally conductive fillers, resin, and curing agents.

[0008] The fiberboard provided by this invention obtains a thermally conductive layer by pressing and curing an electric heating mesh, conductive filler, and resin system D together. When the electric heating mesh is energized and heated, the heat can be transferred to the grout in contact with the thermally conductive layer through the conductive filler, thereby avoiding the phenomenon of excessive viscosity, slow curing, or even freeze-thaw at low temperatures, thus ensuring the ideal reinforcement effect. The insulation layer with low thermal conductivity isolates the heat of the thermally conductive layer from the external environment, thereby reducing the diffusion of heat into the environment.

[0009] In conjunction with the first aspect, the resin system B and / or resin system D further include an internal release agent;

[0010] When an internal release agent is added, in the resin system D, the mass ratio of the resin to the thermally conductive filler is 100:20 to 50, forming a thermally conductive resin, and the mass ratio of the thermally conductive resin to the curing agent and the internal release agent is 100:80 to 100:5 to 10.

[0011] In the resin system B, the mass ratio of the resin, curing agent, and internal release agent is 100:80 to 100:5 to 10.

[0012] The ratio of the above-mentioned thermally conductive resin or resin to the curing agent and internal release agent can ensure that the resulting fiberboard has superior mechanical properties.

[0013] Optionally, the internal release agent includes at least one of INT-1890M, MR-3908, and Deawa 4193N.

[0014] Alternatively, you can choose to use an external release agent or a combination of an external and internal release agent. The external release agent can be applied directly to the inner surface of the mold before closing the mold.

[0015] The external release agent includes At least one of the F-375 and RF-1264W.

[0016] In conjunction with the first aspect, the insulation layer is laid with 1 to 2 layers of the first fiber fabric layer, the heat-conducting layer is laid with 1 to 2 layers of the second fiber fabric layer and 1 layer of the electric heating mesh.

[0017] When the heat-conducting layer comprises two layers of fiber fabric, the heating mesh should be positioned in the middle or second-outer layer of the fiberboard during fabrication. The dimensions of the fiber fabric and the heating mesh should be consistent to ensure uniform performance distribution of the resulting fiberboard.

[0018] The fiber volume fraction of the fiber fabric in the insulation layer and the heat-conducting layer can be 40% to 80%, which can make the fiberboard have stronger overall mechanical properties.

[0019] In conjunction with the first aspect, the thickness of the fiberboard is 0.5 to 1.5 mm.

[0020] Fiberboard in this thickness range is thin and has low tension, so it can be fixed to the reinforced structure without the need for stainless steel nails during actual reinforcement work. This avoids water seeping into the fiberboard through the nail fixing points and causing corrosion to the internal structure. At the same time, it is easy to roll up for storage and on-site construction, solving the problems of existing fiberboard requiring temporary customization, transportation difficulties, and the need to use stainless steel nails to fix the joints.

[0021] Furthermore, when the diameter of the structure to be reinforced is small, the fiberboard provided by this invention can significantly reduce the difficulty of construction.

[0022] Preferably, the thickness of the fiberboard is 1.0 mm.

[0023] Although the thickness of the fiberboard provided by this invention is significantly reduced compared to the thickness of existing fiberboards, the reinforcement effect achievable by the fiberboard obtained by this invention is not affected by the reduction in thickness, due to the combined use of the main raw material resin and fiber fabric, as well as the specific arrangement of the fiberboard structure.

[0024] In conjunction with the first aspect, the fiber fabrics in the first and second fiber fabric layers are selected from at least one of carbon fiber fabric, glass fiber fabric, aramid fiber fabric, and basalt fiber fabric. Since the mechanical properties of each fiber fabric are different, in actual production, a suitable fiber fabric can be selected according to the specific conditions of the structure to be reinforced.

[0025] In conjunction with the first aspect, both resin system B and resin system D include a resin and a curing agent, wherein the resin is selected from at least one of bisphenol A type epoxy resin, bisphenol F type epoxy resin and bisphenol S type epoxy resin.

[0026] The epoxy resin mentioned above has good electrical insulation properties, low water absorption, and high breakdown voltage, which can ensure that the fiberboard does not leak electricity when used in underwater environments.

[0027] In conjunction with the first aspect, the curing agent is an anhydride-based curing agent, which ensures that the resulting fiberboard has good electrical insulation properties even underwater.

[0028] Preferably, the curing agent may be selected from at least one of methyltetrahydrophthalic anhydride, methylhexahydrophthalic anhydride, and methylnadic anhydride.

[0029] In conjunction with the first aspect, the thermally conductive filler includes at least one of graphene, graphite, carbon nanotubes, and boron nitride. Since the thermal conductivity of each thermally conductive filler varies, a suitable filler can be selected based on actual needs in practical applications.

[0030] Preferably, the graphene is selected in powder form with a particle size of 10-20 μm.

[0031] Preferably, the graphite is selected in powder form with a particle size of 80-100 μm.

[0032] Preferably, the carbon nanotubes are in powder form with an aspect ratio of 103 to 106.

[0033] Preferably, boron nitride is selected in powder form with a particle size of 30-50 μm.

[0034] In conjunction with the first aspect, the electric heating mesh includes one type of electric heating metal wire mesh made from aluminum, copper, or iron-chromium-aluminum alloy.

[0035] Preferably, the purity of the aluminum used is greater than 99.8%, the purity of the copper used is greater than 99.95%, and the iron-chromium-aluminum alloy used should include at least 60 wt% iron, 30 wt% chromium and 5 wt% aluminum.

[0036] A second aspect of the present invention provides a method for preparing a fiberboard, specifically comprising the following steps:

[0037] S1. Prepare slurries of resin system B and resin system D respectively;

[0038] S2. Lay the fiber fabric and heating mesh in a mold, inject the slurry of resin system D, close the mold and heat to a gel state to form the heat-conducting layer, open the mold, lay the fiber fabric on the heat-conducting layer, inject the slurry of resin system B, close the mold and heat to solidify, demold to obtain the fiberboard; or lay the fiber fabric in a mold, inject the slurry of resin system B, close the mold and heat to a gel state to form the insulation layer, open the mold, lay the fiber fabric and heating mesh on the insulation layer, inject the slurry of resin system D, close the mold and heat to solidify, demold to obtain the fiberboard.

[0039] This invention utilizes a compression molding method to obtain a fiberboard with an insulation layer and a heat-conducting layer. Both the insulation and heat-conducting layers are flexible resin elastomers, tightly bonded and fused together. This method significantly compresses the thickness of the resulting fiberboard, and the compressed fiberboard can be rolled up and stored, enabling pre-mass production of fiberboard. It also solves the transportation difficulties associated with existing thick fiberboards that are difficult to roll. The manufacturing method is simple, requires only a single piece of equipment, and is easily scalable for mass production.

[0040] Preferably, the width of the obtained fiberboard is 30-50cm.

[0041] In conjunction with the second aspect, the specific steps of heating the mold to the gel state are as follows: the mold temperature is 130-150℃, the mold heating time is 40-60s, and the mold pressure is 1-2MPa; the specific steps of heating the mold to solidify and form are as follows: the mold temperature is 130-150℃, the mold heating time is 10-15min, and the mold pressure is 5-12MPa.

[0042] The above-mentioned mold temperature, heating time, and mold closing pressure range can ensure the successful acquisition of the insulation layer and the heat conduction layer, while taking into account the thickness and mechanical properties of the resulting fiberboard, thereby obtaining a fiberboard whose structural function, thickness, and mechanical properties all meet the requirements for use.

[0043] Applying pressure to the resin-impregnated fiber fabric and heating mesh ensures that the resin fully impregnates the fiber fabric and heating mesh, avoiding resin-deficient areas that would result in significant differences in the mechanical properties of different parts of the fiberboard. In addition, the pressure also allows for better adhesion between the layers of fiber fabric and heating mesh, ensuring that the mechanical properties of the fiberboard are not affected by the large number of internal layers.

[0044] A third aspect of the present invention provides a building structure reinforcement system that uses the above-described fiberboard or fiberboard prepared according to the above-described method. The building structure reinforcement system using this fiberboard is applicable to a variety of building components with different structures that require reinforcement.

[0045] In conjunction with the third aspect, the reinforcement system includes:

[0046] A fiberboard sleeve is formed by spirally winding the fiberboard around the part of the building structure to be reinforced and the part not to be reinforced, or by vertically winding the fiberboard around the part of the building structure to be reinforced and the part not to be reinforced for 1.5 to 3 turns. A grouting space is reserved between the fiberboard sleeve and the building structure. The part not to be reinforced is an area 30 to 80 cm away from the part to be reinforced.

[0047] The grouting reinforcement layer solidifies and forms between the fiberboard sleeve and the building structure.

[0048] During the grouting process, an electric heating network installed inside the fiberboard is powered to regulate the temperature of the fiberboard sleeve, thereby maintaining the fluidity of the grout.

[0049] Fiberboard is wrapped around the area of ​​the building structure to be reinforced to form a fiberboard sleeve. A certain grouting space is formed between the fiberboard sleeve and the building structure. During the grouting process, the temperature of the fiberboard sleeve can be adjusted by an electric heating network to ensure the fluidity of the grout. This reinforcement system is simple in structure and easy to apply in practice.

[0050] In conjunction with the third aspect, during the spiral winding process of the fiberboard, the overlap width shall not be less than 10cm;

[0051] The helix angle of the spiral winding is 60° to 80°.

[0052] In conjunction with the third aspect, a sealing material is applied to the overlap of the fiberboard;

[0053] The fiber sleeve is provided with a sloping cap at the top;

[0054] The grouting material includes at least one of underwater epoxy grouting material or underwater cement-based grouting material.

[0055] The type of grouting material can be selected according to the actual situation and is not limited to the two types mentioned above.

[0056] A fourth aspect of the present invention provides a construction method for the above-mentioned building structure reinforcement system, the specific steps of which include:

[0057] S1. Determine the parts of the building structure that need to be reinforced and the parts that do not need to be reinforced. Set a limiter on the parts that do not need to be reinforced so that when the fiberboard is wrapped around the parts that need to be reinforced, an injection space is formed between the parts that need to be reinforced, the parts that do not need to be reinforced and the fiberboard.

[0058] S2. Cut the fiberboard to the required length according to the dimensions of the part to be reinforced and the part not to be reinforced, ensuring that the cut fiberboard can wrap around the part to be reinforced and the part not to be reinforced at least twice.

[0059] S3. Clean the cut fiberboard, apply sealing material to the pre-defined overlapping part of the fiberboard, fix one end of the fiberboard to the non-reinforced part above the part to be reinforced, and wrap the heat-conducting layer close to the structure to be reinforced to form a fiberboard sleeve. At the same time, press the overlapping part tightly to achieve seamless bonding between fiberboard layers.

[0060] S4. Wrap the fastening tape around the fiberboard sleeve formed in S3, then seal the bottom of the fiberboard sleeve with sealing material, and inject the grout between the fiberboard sleeve and the structure to be reinforced. During the injection process, the temperature of the fiberboard sleeve is adjusted by supplying power to the electric heating network to keep the grout fluid as required for injection.

[0061] S5. After the grout has completely cured, remove the fastening strip and use the capping material to seal the slope.

[0062] When the fiberboard provided by this invention is applied to a building structure reinforcement system, its thinness results in less tension during bending, allowing for multi-layer winding to reinforce the structure and reducing construction difficulty. Furthermore, seamless bonding of the fiberboard overlaps can be achieved using only sealing materials without the need for stainless steel nails. Therefore, the overlapping and joint parts during fiberboard winding can be sealed and bonded with sealing materials, preventing water / or moisture penetration into the fiberboard sleeve and extending the lifespan of the fiberboard sleeve for reinforcing the building structure.

[0063] Optionally, the sealing material mentioned in S3 can be an underwater epoxy adhesive or an underwater polyurethane adhesive, which are waterproof adhesives, to prevent the overlapping parts of the fiberboard sleeve from cracking when exposed to water.

[0064] Optionally, the sealing material in S4 can be a compressible sealing strip, geotextile, needle-punched nonwoven fabric, or spunlace nonwoven fabric, etc. The thickness of the sealing material should be greater than the height of the limiter to ensure that the sealing material is not squeezed out due to the injection of grout, thereby playing a sealing role.

[0065] Optionally, the capping material mentioned in S5 can be an underwater epoxy adhesive or an underwater polyurethane adhesive, etc.

[0066] In conjunction with the fourth aspect, during the grouting process in S4, the grouting material is injected at least twice between the fiberboard sleeve and the structure to be reinforced, specifically including:

[0067] The initial grouting height is 10-15cm, and it is used as a sealant after the grout has cured.

[0068] For the second grouting, when the height of the part to be reinforced is no more than 2m, the grouting material is directly poured into the top of the fiberboard sleeve. When the height of the part to be reinforced is greater than 2m, the height of the second grouting is 1 to 1.5m. After the grouting material has solidified, the grouting continues according to the standard of 1 to 1.5m grouting height until it reaches the top of the fiberboard sleeve.

[0069] Dividing the grout into multiple injections can avoid the risk of bulging of the fiberboard sleeve caused by the expansion force generated during the curing process of a large amount of grout injected at once. Moreover, the first injection of grout can also play a certain role in preventing leakage after curing.

[0070] The beneficial effects of this invention are as follows: The fiberboard provided by this invention has a heating function. By energizing the heating grid, heat can be transferred to the grout in contact with the heat-conducting layer through the conductive filler, thereby avoiding the phenomenon of excessive viscosity, slow curing, or even freeze-thaw cycles in the grout at low temperatures, thus ensuring the reinforcement effect. Moreover, compared with the prior art, the fiberboard provided by this invention is thinner and easier to bend, solving the problems of existing fiberboards being difficult to install on-site and transport due to their large thickness. At the same time, the thinner fiberboard has less tension when bent, and the overlap of the fiberboard can be sealed and bonded using only sealing material without the need for stainless steel nails. This solves the problem that existing fiberboards, due to their large thickness, must use stainless steel nails for overlap and fixation. It also solves the problem of water or moisture entering the sleeve through the gaps caused by the need for stainless steel nails for anchoring in traditional sleeves, thereby extending the reinforcement life of the fiberboard sleeve.

[0071] The present invention also provides a method for preparing fiberboard. The method uses molding to obtain fiberboard with a double-layer structure of insulation layer and heat conduction layer and controllable thickness. The fiberboard can be rolled up and stored, realizing the pre-mass production of fiberboard. This solves the problem that existing fiberboard can only be temporarily ordered due to its large thickness, difficulty in storage and transportation, and speeds up the reinforcement operation cycle.

[0072] The present invention also provides a building structure reinforcement system, which uses the above-mentioned fiberboard or fiberboard prepared according to the above-mentioned preparation method. The system has a simple structure and provides a new reinforcement method for various building components.

[0073] The construction method of the building structure reinforcement system provided by the present invention is simple. Since the thickness of the fiberboard used is small, it can be reinforced by wrapping. Furthermore, sealing and bonding can be achieved by applying sealing material to the overlapping and lapped parts of the fiberboard, which significantly improves the convenience of construction. Attached Figure Description

[0074] Figure 1 This is a partial structural diagram of the fiberboard;

[0075] Figure 2 This is a partial structural diagram of the thermally conductive layer of the fiberboard.

[0076] Figure 3 A partial structural diagram of the fiberboard insulation layer;

[0077] Figure 4 A schematic diagram showing the fiberboard sleeve structure wound with its axis parallel to the axis of the structure to be reinforced;

[0078] Figure 5 This is a schematic diagram showing the fiberboard wound axially at a certain angle with the structure to be reinforced.

[0079] Figure 6 A partial structural diagram showing the parts of the building structure that need reinforcement and those that do not.

[0080] Figure 7 The bar chart shows the thermal conductivity of the fiberboards obtained in Examples 1-5 and Comparative Example 4.

[0081] Figure 8 These are photos of existing fiberboard during actual transportation.

[0082] Among them, 1-insulation layer, 2-heat-conducting layer, 3-electric heating mesh, 4-fiber fabric, 5-non-reinforcement part, 6-fiberboard, 7-reinforcement part. Detailed Implementation

[0083] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0084] Currently available fiberboards are quite thick, resulting in high tensile strength after bending, which increases construction difficulty and requires custom production based on the actual dimensions of the piles. Furthermore, the high tensile strength necessitates the use of stainless steel nails to secure the joints, but the use of stainless steel nails can allow water to seep into the grouting material inside the fiberboard or into the pile, causing corrosion and shortening the reinforcement life of the fiberboard. Additionally, if the construction temperature is low, the reinforcement grout may become too viscous, cure too slowly, or even experience freeze-thaw cycles, severely reducing the reinforcement effect.

[0085] The fiberboard provided by this invention is thin and has a heating function. When applied to the reinforcement of building structures, it not only solves the problems of difficult transportation and storage of existing fiberboards, as well as the need to use stainless steel nails to fix the joints, but also makes the reinforcement effect of the fiberboard no longer constrained and affected by the external temperature, and is easy to mass-produce.

[0086] In the following embodiments, when using an internal release agent, the internal release agent is mixed with the resin system in a certain proportion and then pressed; when using an external release agent, the external release agent is directly applied to the inner surface of the mold.

[0087] Example 1

[0088] This embodiment provides a fiberboard comprising a composite-cured thermally conductive layer and an insulation layer; wherein the insulation layer is formed by pressing and curing a first fiber fabric layer and a resin system B, and the thermally conductive layer is formed by pressing and curing an electric heating mesh, a second fiber fabric layer, and a resin system D; the raw materials of the resin system D include thermally conductive fillers, resin, and a curing agent. The specific types and proportions of raw materials for the thermally conductive layer and the insulation layer are shown in Table 1.

[0089] The thickness of the resulting fiberboard is 1.0 mm.

[0090] The method for preparing this fiberboard includes:

[0091] Prepare slurries for resin system B and resin system D according to the formulas in Table 1, respectively.

[0092] Two layers of fiber fabric and one layer of electric heating mesh are sequentially laid in the mold, resin system D slurry is injected, the mold is closed with a closing pressure of 1 MPa, and heated at 150℃ for 40 seconds to a gel state to form a heat-conducting layer; the mold is opened, two layers of fiber fabric are laid on the heat-conducting layer, resin system B slurry is injected, the mold is closed with a closing pressure of 8 MPa, and heated at 150℃ for 10 minutes to solidify and form, the mold is demolded, and the fiberboard is obtained, which is then rolled up and stored.

[0093] Example 2

[0094] This embodiment provides a fiberboard that differs from Embodiment 1 in that the types and proportions of raw materials are different. The specific types and proportions of components in this embodiment are shown in Table 1.

[0095] The thickness of the resulting fiberboard is 1.5 mm.

[0096] The method for preparing this fiberboard includes:

[0097] Prepare slurries for resin system B and resin system D according to the formulas in Table 1, respectively.

[0098] Two layers of fiber fabric are laid in a mold, resin system B slurry is injected, the mold is closed with a closing pressure of 2MPa, and heated at 140℃ for 50s to a gel state to form an insulation layer; the mold is opened, two layers of fiber fabric and one layer of electric heating mesh are laid on the insulation layer in sequence, resin system D slurry is injected, the mold is closed with a closing pressure of 5MPa, and heated at 140℃ for 12min to solidify and form, the mold is demolded, and the fiberboard is obtained, which is then rolled up and stored.

[0099] Example 3

[0100] This embodiment provides a fiberboard that differs from Embodiment 1 in that the types and proportions of raw materials are different. The specific types and proportions of components in this embodiment are shown in Table 1.

[0101] The thickness of the resulting fiberboard is 0.5 mm.

[0102] The method for preparing this fiberboard includes:

[0103] Prepare slurries for resin system B and resin system D according to the formulas in Table 1, respectively.

[0104] One layer of fiber fabric, one layer of electric heating mesh, and one layer of fiber fabric are sequentially laid in the mold. The slurry of resin system D is injected, and the mold is closed with a closing pressure of 2 MPa. It is then heated at 130°C for 60 seconds to reach a gel state, forming a heat-conducting layer. The mold is then opened, and one layer of fiber fabric is laid on the heat-conducting layer. The slurry of resin system B is injected, and the mold is closed with a closing pressure of 12 MPa. It is then heated at 130°C for 15 minutes to solidify and form a heat-insulating layer. The mold is then demolded to obtain the fiberboard, which is then rolled up and stored.

[0105] Example 4

[0106] This embodiment provides a fiberboard that differs from Embodiment 1 in that the types and proportions of raw materials are different. The specific types and proportions of components in this embodiment are shown in Table 1.

[0107] The thickness of the resulting fiberboard is 1.0 mm.

[0108] The fiberboard is prepared using the same method as in Example 1.

[0109] Example 5

[0110] This embodiment provides a fiberboard that differs from Embodiment 1 in that the components and their proportions are different. The specific types and proportions of the components in this embodiment are shown in Table 1.

[0111] The thickness of the resulting fiberboard is 0.8 mm.

[0112] The fiberboard is prepared using the same method as in Example 1.

[0113] Schematic diagrams of partial structures of the fiberboards obtained in Examples 1-5 are shown below. Figures 1-3 As shown.

[0114] Example 6

[0115] This embodiment provides a building structure reinforcement system, which uses the fiberboard obtained in Embodiment 1 for reinforcement, including:

[0116] A fiberboard sleeve is formed by spirally winding the fiberboard around the part of the building structure to be reinforced and the part not to be reinforced, or by vertically winding the fiberboard around the part of the building structure to be reinforced and the part not to be reinforced for 1.5 to 3 turns. A grouting space is reserved between the fiberboard sleeve and the building structure. The part not to be reinforced is an area 30 to 80 cm away from the part to be reinforced.

[0117] The grouting reinforcement layer solidifies and forms between the fiberboard sleeve and the building structure.

[0118] During the grouting process, an electric heating network installed inside the fiberboard is powered to regulate the temperature of the fiberboard sleeve, thereby maintaining the fluidity of the grout.

[0119] Example 7

[0120] This embodiment provides a construction method for the building structure reinforcement system provided in Embodiment 6, the specific steps of which include:

[0121] S1. Determine the parts of the building structure that need to be reinforced and those that do not need to be reinforced. Set a limiter on the parts that do not need to be reinforced so that when the fiberboard is wrapped around the parts that need to be reinforced, an injection space is formed between the parts that need to be reinforced, the parts that do not need to be reinforced, and the fiberboard.

[0122] S2. Cut the required length of fiberboard according to the dimensions of the part to be reinforced and the part not to be reinforced, ensuring that the cut fiberboard can wrap around the part to be reinforced and the part not to be reinforced at least twice.

[0123] S3. Clean the cut fiberboard, apply sealing material to the pre-set overlapping part of the fiberboard, fix one end of the fiberboard to the non-reinforced part above the part to be reinforced, and bring the heat-conducting layer close to the structure to be reinforced. Spiral-wrap the fiberboard around the part to be reinforced and the non-reinforced part of the building structure at a spiral angle of 60° to 80°, or vertically wrap the fiberboard around the part to be reinforced and the non-reinforced part of the building structure 1.5 to 3 times to form a fiberboard sleeve. At the same time, press the overlapping part tightly to achieve seamless bonding between the fiberboard layers.

[0124] S4. Wrap the fastening tape around the fiberboard sleeve formed in S3, and then seal the bottom of the fiberboard sleeve with a sealing material thicker than the height of the limiter. Pour the grout into the space between the fiberboard sleeve and the structure to be reinforced in at least two stages. The height of the first pour should be 10-15cm. The number of subsequent pours should be determined according to the height of the part to be reinforced. The standard pouring height for each pour should be 1-1.5m. During the pouring process, the electric heating network can be powered to adjust the temperature of the fiberboard sleeve and keep the grout flowing as required (220V standard AC voltage is sufficient).

[0125] S5. After the grout has completely cured, remove the fastening strips and use the capping material to seal the slope.

[0126] In the above applications, epoxy structural adhesive can be used as the sealing material; Carben underwater epoxy grout CMEG or underwater cement-based grout CCBG can be preferred as the grouting material; and epoxy-based structural adhesives such as Carben CUCR underwater epoxy sealing adhesive can be used as the capping material.

[0127] In the construction method of the building structure reinforcement system provided in this embodiment, the schematic diagrams of the fiberboard winding methods are as follows: Figures 4-5 As shown.

[0128] Comparative Example 1

[0129] This comparative example provides a fiberboard with specific components and proportions similar to those in Example 1, except that no electric heating mesh is laid in the heat-conducting layer, while the other components and proportions are the same as those in Example 1.

[0130] Comparative Example 2

[0131] This comparative example provides a fiberboard with specific components and proportions similar to those in Example 2, except that an electric heating mesh is not laid in the heat-conducting layer, while the other components and proportions are the same as those in Example 2.

[0132] Comparative Example 3

[0133] This comparative example provides a fiberboard with specific components and proportions similar to those in Example 3, except that no electric heating mesh is laid in the heat-conducting layer, while the other components and proportions are the same as those in Example 3.

[0134] Comparative Example 4

[0135] This comparative example provides a fiberboard with the same component formulation as in Example 1 and a similar preparation method as in Example 1, except that no pressure is applied during mold closing, i.e., the mold closing is carried out under normal pressure.

[0136] Comparative Example 5

[0137] This comparative example provides a fiberboard with the same component formulation as in Example 1 and a similar preparation method as in Example 1, except that after injecting the slurry of resin system B, the mold is closed with a closing pressure of 20 MPa.

[0138] Table 1. Composition and proportions (parts by mass) of fiberboard in Examples 1-5 and Comparative Examples 1-3

[0139]

[0140]

[0141] Test Example 1

[0142] The mechanical properties of the fiberboards obtained in Examples 1-5 and Comparative Examples 1-5 were tested, and their density and thermal conductivity were measured. The test results are shown in Table 2.

[0143] Table 2. Results of physical property measurements for Examples 1-5 and Comparative Examples 1-5

[0144]

[0145] As can be seen from Table 2, compared with the fiberboard obtained without the electric heating mesh in Comparative Examples 1-3, the tensile strength and flexural strength of the fiberboard in Examples 1-3 provided by the present invention did not fluctuate significantly, indicating that the use of the electric heating mesh does not affect the reinforcement effect of the fiberboard; moreover, the laying of the electric heating mesh did not affect the flexural modulus of elasticity, indicating that the electric heating mesh does not affect the subsequent construction performance of the fiberboard.

[0146] It should be noted that the fiberboard provided by this invention is not limited to its application in bridge piles; it is also applicable to other types of building structures / components that require reinforcement.

[0147] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A building structure reinforcement system, characterized in that, include: A fiberboard sleeve is formed by wrapping fiberboard around both the reinforced and unreinforced parts of a building structure, wherein a pre-existing injection space is provided between the fiberboard sleeve and the building structure; and The grouting reinforcement layer solidifies and forms between the fiberboard sleeve and the building structure. During the grouting process, the electric heating network installed inside the fiberboard is powered to regulate the temperature of the fiberboard sleeve, so that the grouting material remains fluid. The fiberboard includes a composite-cured thermally conductive layer and a thermal insulation layer; The insulation layer is formed by pressing and curing a first fiber fabric layer and a resin system B, wherein the resin system B does not contain thermally conductive fillers. The heat-conducting layer is formed by pressing and curing an electric heating mesh, a second fiber fabric layer, and a resin system D. The raw materials of the resin system D include thermally conductive fillers, resin, and curing agents. The electric heating mesh is capable of being heated by electricity, and the fiber fabric layer is a bidirectional fiber fabric.

2. The building structure reinforcement system as described in claim 1, characterized in that, The resin system B and / or resin system D also include an internal release agent; When an internal release agent is added, in the resin system D, the mass ratio of the resin to the thermally conductive filler is 100:20~50, forming a thermally conductive resin, and the mass ratio of the thermally conductive resin to the curing agent and the internal release agent is 100:80~100:5~10; and / or In the resin system B, the mass ratio of the resin, curing agent, and internal release agent is 100:80~100:5~10.

3. The building structure reinforcement system as described in claim 1, characterized in that, The insulation layer is made up of 1-2 layers of the first fiber fabric, and the heat-conducting layer is made up of 1-2 layers of the second fiber fabric and 1 layer of the electric heating mesh; The thickness of the fiberboard is 0.5~1.5mm.

4. The building structure reinforcement system as described in claim 1, characterized in that, The fiber fabrics in the first and second fiber fabric layers are selected from at least one of carbon fiber fabrics, glass fiber fabrics, aramid fiber fabrics and basalt fiber fabrics; Both resin system B and resin system D include resin and curing agent, wherein the resin is selected from at least one of bisphenol A type epoxy resin, bisphenol F type epoxy resin and bisphenol S type epoxy resin, and the curing agent is an acid anhydride curing agent. The thermally conductive filler includes at least one of graphene, graphite, carbon nanotubes, and boron nitride; The electric heating mesh includes one type of electric heating metal wire mesh made of aluminum, copper, or iron-chromium-aluminum alloy.

5. The building structure reinforcement system according to any one of claims 1 to 4, characterized in that, The method for preparing the fiberboard specifically includes the following steps: S1. Prepare slurries of resin system B and resin system D respectively; S2. Lay the fiber fabric and electric heating mesh in the mold, inject the slurry of the resin system D, close the mold and heat to the gel state to form the heat-conducting layer, open the mold, lay the fiber fabric on the heat-conducting layer, inject the slurry of the resin system B, close the mold and heat to solidify and shape, demold to obtain the fiberboard; Alternatively, the fiber fabric can be laid in a mold, the slurry of resin system B can be injected, the mold can be closed and heated to a gel state to form the insulation layer, the mold can be opened, the fiber fabric and the electric heating mesh can be laid on the insulation layer, the slurry of resin system D can be injected, the mold can be closed and heated to solidify and form, and the mold can be demolded to obtain the fiberboard.

6. The building structure reinforcement system as described in claim 5, characterized in that, The specific steps of heating the mold to a gel state are as follows: the mold temperature is 130~150℃, the mold heating time is 40~60s, and the mold pressure is 1~2MPa; The specific steps for heating and solidifying the mold are as follows: the mold temperature is 130~150℃, the mold heating time is 10~15min, and the mold pressure is 5~12MPa.

7. The building structure reinforcement system as described in claim 1, characterized in that, The reinforcement system includes: A fiberboard sleeve is formed by spirally winding the fiberboard around both the reinforced and unreinforced parts of a building structure, or by vertically winding the fiberboard 1.5 to 3 turns around both the reinforced and unreinforced parts of the building structure. A pre-existing injection space is provided between the fiberboard sleeve and the building structure. The unreinforced part is an area 30 to 80 cm outside the reinforced part. The grouting reinforcement layer solidifies and forms between the fiberboard sleeve and the building structure. During the grouting process, an electric heating network installed inside the fiberboard is powered to regulate the temperature of the fiberboard sleeve, thereby maintaining the fluidity of the grout.

8. The building structure reinforcement system as described in claim 7, characterized in that, During the spiral winding process of the fiberboard, the overlap width shall not be less than 10cm; The helix angle of the spiral winding is 60°~80°.

9. The building structure reinforcement system as described in claim 1, characterized in that, A sealing material is applied to the overlap of the fiberboard. A sloping cap is provided at the top of the fiberboard sleeve; The grouting material includes at least one of underwater epoxy grouting material or underwater cement-based grouting material; The grouting space reserved between the fiberboard sleeve and the building structure is controlled by setting multiple limiters at the non-reinforced parts of the building structure.

10. A construction method for the building structure reinforcement system according to any one of claims 1 to 9, characterized in that, The specific steps include: S1. Determine the parts of the building structure that need to be reinforced and the parts that do not need to be reinforced. Set a limiter on the parts that do not need to be reinforced so that when the fiberboard is wrapped around the parts that need to be reinforced, an injection space is formed between the parts that need to be reinforced, the parts that do not need to be reinforced and the fiberboard. S2. Cut the fiberboard to the required length according to the dimensions of the part to be reinforced and the part not to be reinforced, ensuring that the cut fiberboard can wrap around the part to be reinforced and the part not to be reinforced at least twice. S3. Clean the cut fiberboard, apply sealing material to the pre-defined overlapping part of the fiberboard, fix one end of the fiberboard to the non-reinforced part above the part to be reinforced, and wrap the heat-conducting layer close to the structure to be reinforced to form a fiberboard sleeve. At the same time, press the overlapping part tightly to achieve seamless bonding between fiberboard layers. S4. Wrap the fastening tape around the fiberboard sleeve formed in S3, then seal the bottom of the fiberboard sleeve with sealing material, and inject the grout between the fiberboard sleeve and the structure to be reinforced. During the injection process, the temperature of the fiberboard sleeve is adjusted by supplying power to the electric heating network to keep the grout fluid as required for injection. S5. After the grout has completely cured, remove the fastening strip and use the capping material to seal the slope.

11. The construction method of the building structure reinforcement system as described in claim 10, characterized in that, When injecting grout in S4, the grout shall be injected into the space between the fiberboard sleeve and the structure to be reinforced in at least two stages, specifically including: The initial grouting height is 10-15cm, and it is used as a sealant after the grout has cured. For the second grouting, when the height of the part to be reinforced is no more than 2m, the grouting material is directly poured into the top of the fiberboard sleeve. When the height of the part to be reinforced is greater than 2m, the height of the second grouting is 1~1.5m. After the grouting material has solidified, the grouting continues according to the standard of grouting height of 1~1.5m until it reaches the top of the fiberboard sleeve.

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