Modularized building updating construction method based on near-zero energy consumption

Abstract

The invention provides a modular building renewal construction method based on near-zero energy consumption, relates to the field of modular buildings, and aims to solve the problem that modular building structural components are exposed to form a heat bridge, outer acanthus and inner acanthus are fixed to the inner side and the outer side of a side frame correspondingly to form renewal wallboards with air layers reserved in the middles, the heat bridge effect is effectively reduced, and the construction efficiency is improved. The energy-saving effect is improved, the situation that an overall airtight layer is not considered in an existing modular building is improved, waterproof vapor-proof films are bonded to the ground plate, the inner leaf plate and the roof plate, the waterproof vapor-proof films on the roof plate and the inner leaf plate are connected in a sealed mode, and a continuous waterproof airtight layer and an airtight layer are formed in the building; and the influence of air permeation on the indoor constant environment is greatly reduced.

Description

Technical Field

[0001] The present invention relates to the field of modular buildings, and particularly to a method for updating the construction of a modular building based on nearly zero energy consumption. Background Art

[0002] Modular buildings mainly refer to steel structure box modular houses, which are box-type buildings composed of a steel structure as the box structure and a combination of enclosures and frames. All module components are designed and fabricated standardized in the factory, and the house components are quickly installed on-site through standardized connectors to complete the construction of the house. The design and construction of this modular combined house project conform to the principles of generalization, modularization, industrialization, and optimized integration. The steel structure box modular house mainly consists of the following accessories: Box top: It is composed of components such as top beams, corner fittings, capping steel plates, thermal insulation materials, top C-shaped bars, ceiling boards, and wire boxes. Box bottom: It is composed of components such as bottom beams, bottom corner fittings, bottom sealing color plates, bottom C-shaped purlins, thermal insulation materials, load-bearing floors, decorative floors, and drainage grooves. Columns: It is composed of components such as corner columns, L-shaped angles, column intermediate pieces, and thermal insulation materials. Outer wall: It is a metal-faced adiabatic sandwich panel, and the standard wall panel thickness has options of 75mm and 100mm.

[0003] Chinese Patent (Publication No. CN 113374096 A, Publication Date: September 10, 2021) discloses a building with passive low-energy technology renovation, which reduces the overall energy consumption of the building by treating the structural components, thermal insulation and airtight components, and detailed components of the building itself. It is applicable to both the renovation of existing buildings and new buildings, making them meet the indoor environmental requirements and building airtightness requirements of passive low-energy buildings; the existing modular buildings have a relatively thin thermal insulation layer and a large heat transfer coefficient of the enclosure structure, unable to meet the indoor environmental requirements of nearly zero energy consumption buildings. Moreover, the structural components of modular buildings are exposed, forming more thermal bridges, which have a greater adverse impact on energy conservation. The overall airtight layer of the building is not considered, and air infiltration has a greater impact on the environmental constancy. Summary of the Invention

[0004] The purpose of the present invention is to address the deficiencies existing in the prior art and provide a method for updating the construction of a modular building based on nearly zero energy consumption. By fixing outer leaf plates and inner leaf plates on the inner and outer sides of the side frames respectively to form an intermediate reserved air layer for the updated wall panels, the heat bridge effect is effectively reduced, the energy-saving effect is improved, and the situation that the existing modular buildings do not consider the overall airtight layer is improved. By bonding waterproof and vapor barrier membranes on the floor slab, inner leaf plates, and roof slab, and making the waterproof and vapor barrier membranes on the roof slab and inner leaf plates be sealed and connected, a continuous waterproof airtight layer and airtight layer are formed inside the building, greatly reducing the impact of air infiltration on the indoor constant environment.

[0005] To solve the above problems, the following solutions are adopted:

[0006] A construction method for updating modular buildings based on nearly zero energy consumption, including:

[0007] Demolish the original wall panels of the modular building to expose the side frames of the modular building. The original wall panels are used for the original roof slope finding and are placed below the ground where the modular building is constructed.

[0008] Fix the updated floor slab bonded with a waterproof and vapor barrier film to the bottom of the original ground, fix the updated outer leaf panels and the inner leaf panels bonded with a waterproof and vapor barrier film to the side frames to form updated wall panels with an air layer reserved in the middle, and fix the updated roof slab bonded with a waterproof and vapor barrier film to the top of the original roof.

[0009] The waterproof and vapor barrier films on the roof slab and the inner leaf panels are hermetically connected to form a continuous waterproof and airtight layer.

[0010] Construct a foundation and a ground cushion in the modular building construction area, place the demolished original wall panels on the ground cushion, and place the updated modular building on the foundation.

[0011] Furthermore, a waterproof and vapor barrier film is bonded to one side of the floor slab facing the bottom of the original ground, a waterproof and vapor barrier film is bonded to the side of the inner leaf panel facing the outer leaf panel, and a waterproof and vapor barrier film is bonded to the side of the roof slab facing the top of the original roof.

[0012] Furthermore, after the four-sided inner leaf panels of the modular building are fixed, the waterproof and vapor barrier films bonded to the adjacent inner leaf panels are connected and continuously distributed.

[0013] Furthermore, window keels are added at the window positions of the modular building, and passive windows are fixed. A waterproof and vapor barrier film is bonded to the inner side of the passive windows and is hermetically connected to the waterproof and vapor barrier film on the inner leaf panels.

[0014] Furthermore, the inner leaf panels and the outer leaf panels are respectively fixed on the keels of the side frames, and corner plates are installed at the corner positions of the outer leaf panels and the plate seams are compacted for sealing.

[0015] Furthermore, drainage structures are provided at the four corners of the roof slab. Grooves are cut on the roof slab using the demolished original wall panels to form drainage ditches, waterproof coiled materials are covered, and the drainage ditches are connected to the original rainwater inlets of the modular building.

[0016] Furthermore, a rainwater ditch is provided at the edge of the original roof, and a drainage board is buckled outside the rainwater ditch to cover the gap between the roof and the updated wall panels.

[0017] Furthermore, the original wall panels of the modular building are demolished and the updated structures are installed in the assembly factory, and an installation space is reserved around the modular building.

[0018] Furthermore, after the modular building is disassembled into multiple modules, the multiple modules are respectively demolished and updated.

[0019] Furthermore, the updated modules are transported to the modular building construction area in module form for assembly, and the original wall panel supports are demolished and used for installation.

[0020] Compared with the prior art, the advantages and positive effects of the present invention are as follows:

[0021] Aiming at the problem that the structural components of modular buildings are exposed to form thermal bridges, an updated wall panel is adopted, in which an outer leaf panel and an inner leaf panel are respectively fixed on the inner and outer sides of the side frame to form a reserved air layer in the middle, effectively reducing the thermal bridge effect, improving the energy-saving effect, and improving the situation that the existing modular buildings do not consider the overall airtight layer. By bonding waterproof and vapor barrier membranes on the floor panel, inner leaf panel and roof panel, and making the waterproof and vapor barrier membranes on the roof panel and inner leaf panel be sealed and connected, a continuous waterproof and airtight layer and an airtight layer are formed inside the building, greatly reducing the impact of air infiltration on the indoor constant environment.

[0022] It solves the problems of thin insulation layer and large heat transfer coefficient of the envelope structure in existing modular buildings. By updating envelope structure components such as floor panels, wall panels and roof panels, and adding high-efficiency insulation layers, it meets the indoor environment requirements of nearly zero-energy buildings. It significantly improves the energy utilization efficiency of modular buildings, reduces energy consumption, makes the building closer to the nearly zero-energy standard, and reduces energy consumption and operating costs.

[0023] It enhances the heat insulation and airtightness of the building, improves the stability and comfort of the indoor environment, and provides a more suitable living or working space for users. Using the demolished original wall panels for roof slope finding and ground moisture-proof and waterproof treatment, etc., realizes the reasonable reuse of materials, reduces construction costs and resource waste, and has good economic and environmental benefits. Description of the Drawings

[0024] The specification drawings forming a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention.

[0025] Figure 1 It is a schematic diagram of the updated construction method of a modular building based on nearly zero energy consumption in Embodiment 1 of the present invention. Detailed Description of the Invention

[0026] Embodiment 1

[0027] In a typical embodiment of the present invention, as Figure 1 shown, a construction method for updating a modular building based on nearly zero energy consumption is given.

[0028] As Figure 1 shown, this embodiment provides a construction method for updating a modular building based on nearly zero energy consumption, including:

[0029] Demolish the original wall panels of the modular building to expose the side frame of the modular building. The original wall panels are used for the original roof slope finding and are placed below the ground level where the modular building is constructed.

[0030] Fix the updated floor panel bonded with a waterproof vapor barrier to the bottom of the original ground. Fix the updated outer leaf panel and the inner leaf panel bonded with a waterproof vapor barrier to the side frame to form an updated wall panel with an air layer reserved in the middle. Fix the updated roof panel bonded with a waterproof vapor barrier to the top of the original roof.

[0031] The waterproof vapor barriers on the roof panel and the inner leaf panel are hermetically connected to form a continuous waterproof and airtight layer.

[0032] Construct a foundation and a ground cushion layer in the modular building construction area. Place the demolished original wall panels on the ground cushion layer, and place the updated modular building on the foundation.

[0033] Specifically, the specific steps for updating the envelope structure of the nearly zero - energy modular building include:

[0034] 1. Transportation and site preparation:

[0035] Transport the modular building to the assembly factory, which covers an area of 13m x 16m, and leave a 5m installation space around the building. Place the thermal insulation decorative panels, passive windows, keels and other materials and components for roof, wall and floor updates outside. Ensure that there are sufficient materials and reasonable space on the construction site for subsequent construction operations.

[0036] 2. Preparation for original wall demolition and utilization:

[0037] Demolish the original wall of the modular building and cut it into two parts. One part is used for roof slope finding. Cut and place it according to the roof drainage design requirements to ensure a reasonable roof drainage slope. The other part is placed below the ground, and its structure and material properties are used to achieve protection, moisture - proof and waterproof functions, forming an effective protective layer in the ground structure.

[0038] 3. Waterproof vapor barrier treatment:

[0039] Bond and fix waterproof vapor barriers on the non - decorative side of the thermal insulation decorative panels on the roof, the inner leaf panel of the exterior wall and the ground. For the thermal insulation decorative panel on the roof, the waterproof vapor barrier on the side close to the interior should be hermetically sealed with the waterproof vapor barrier of the subsequent inner leaf panel of the exterior wall. For the inner leaf panel of the exterior wall, ensure the accurate position and firm bonding of its waterproof vapor barrier during installation. When the waterproof vapor barrier of the ground thermal insulation decorative panel is fixed upwards, ensure its integrity to prevent water vapor penetration.

[0040] 4. Floor update and assembly:

[0041] Use a jack to lift the modular building, and fix the additional ground thermal insulation and decorative board with the waterproof and vapor barrier film facing up on the original keel. During the fixing process, ensure that the thermal insulation and decorative board is closely connected to the original keel to guarantee the structural stability and thermal insulation performance after the ground renovation, and complete the assembly of the ground near-zero energy consumption renovation method.

[0042] 5. Exterior wall renovation assembly:

[0043] First, restore the modular building to its original height, fix the waterproof and vapor barrier film of the inner leaf of the exterior wall facing outwards on the original keel, and add window keels at the window positions to install passive windows. The passive window only has a waterproof and vapor barrier film preset on the inner side, and is tightly sealed with the waterproof and vapor barrier film of the inner leaf during installation to ensure the airtightness and waterproof performance between the window and the wall. After the four inner leafs are fixed, compact and seal the joints of the waterproof and vapor barrier film to prevent water vapor leakage. Finally, fix the outer leaf on the original keel, and use corner plates for local installation and compact and seal the board joints to form a complete exterior wall enclosure structure.

[0044] 6. Roof renovation assembly:

[0045] Add drainage structures with the same thickness as the board at the four corners of the thermal insulation and decorative board on the roof and conduct sealing treatment, then lift the board with the waterproof and vapor barrier film facing down to the roof and fix it on the original keel. Ensure that the thermal insulation and decorative board on the roof is firmly installed and the drainage structure is effective. Then, fully seal and bond the waterproof and vapor barrier film laid on the roof with the waterproof and breathable film on the inner leaf of the exterior wall to ensure the waterproof continuity between the roof and the exterior wall. Use the original exterior wall board removed to cut a groove on the roof to form a drainage ditch, lay a layer of waterproof coiled material on it and seal it well so that rainwater can be discharged through the original rainwater outlet to maintain the drainage function of the roof. Finally, buckle the drainage board on the outside of the roof rainwater ditch to cover the gap between the roof and the wall to enhance the waterproof effect.

[0046] 7. Module assembly and final assembly:

[0047] Only assemble modular renovation buildings that can be transported with a size of about 3m x 6m in the factory. If multiple modules are involved, they need to be transported to the site and assembled with 3m x 6m as the basic module. Make four-corner foundations and ground cushions at the actual installation positions of the modular renovation buildings, place the removed exterior wall boards on the cushions, place the modular renovation buildings on the foundations, use the removed walls to install the plinth, and finally use buckles to process the board joints to complete the final assembly of the enclosure structure renovation, ensuring the overall structural stability, complete appearance of the building and meeting the near-zero energy consumption requirements.

[0048] For the window positions, window keels are added at the window positions of the modular building to fix passive windows. The inner side of the passive window is bonded with a waterproof and vapor barrier film and is hermetically connected to the waterproof and vapor barrier film on the inner leaf.

[0049] Such as Figure 1As shown in the figure, in the renovation of the modular building envelope based on near-zero energy consumption, the setting of the waterproof and vapor barrier film for passive windows is a key link. Only a waterproof and vapor barrier film is preset on the inner side and tightly sealed with the inner leaf panel, aiming to prevent indoor water vapor from penetrating into the wall and the insulation structure of the window, avoiding problems such as condensation from affecting the insulation and structural performance, and ensuring the airtightness and insulation effect of the building envelope.

[0050] Specifically, the specific steps for setting the waterproof and vapor barrier film on the inner side of passive windows are as follows:

[0051] Preparation before construction: When manufacturing passive windows in the factory, notches or pasting areas for installing the waterproof and vapor barrier film are reserved at specific positions on the inner side frame or window frame of the window. The selected waterproof and vapor barrier film should have high water vapor barrier performance, durability, and good adhesion to the window frame material. For example, common polymer waterproof and vapor barrier films such as polyethylene (PE) and polypropylene (PP) have low water vapor transmission rates and can effectively block the diffusion of indoor water vapor into the window structure.

[0052] Installation process: During the on-site assembly stage of the modular building, when installing passive windows, first cut the waterproof and vapor barrier film to the appropriate size so that it can completely cover the reserved area on the inner side of the window. Use special adhesives, such as high-performance polyurethane glue or silicone glue, to tightly paste the waterproof and vapor barrier film on the inner side of the window frame. Ensure that there are no bubbles or gaps between the film and the window frame, and the bonding is firm. Especially at the window corners and other parts, strengthen the pasting to prevent water vapor from leaking from here. At the connection part with the inner leaf panel, extend the waterproof and vapor barrier film to cover the corresponding sealing area of the inner leaf panel, make the waterproof and vapor barrier films of the two fit tightly, and then use sealing tape or sealant for secondary sealing and reinforcement to form a continuous and complete water vapor barrier line, ensuring the airtightness and dryness of the indoor environment and maintaining the near-zero energy consumption performance of the building.

[0053] The design of setting the waterproof and vapor barrier film on passive windows needs to take into account both the waterproof and vapor barrier functions and the normal use of the windows. Reasonable design and installation can ensure effective waterproof and vapor barrier without affecting the opening and closing of the windows, and guarantee the performance of the building envelope.

[0054] The waterproof and vapor barrier film is usually installed on the inner side of the window frame. As long as the installation process is precise and the thickness, flexibility, and bonding method of the film are properly selected, it will not hinder the normal movement of the window sash. For example, when selecting a polymer waterproof and vapor barrier film with a moderate thickness (generally between 0.3 - 0.5 mm) and good flexibility, such as polyethylene (PE) or polypropylene (PP) material, ensure that its edges are flat and smooth during pasting and do not exceed the moving range of the window frame, then it can avoid friction interference with the window sash and thus not affect the opening and closing operations of the window. Construction workers will strictly follow the specifications during the installation process. First, clean the surface of the window frame to ensure that there are no dust, oil stains, and other impurities affecting the bonding effect, and then accurately fit the waterproof and vapor barrier film to the designated position on the window frame, and compact and inspect to ensure the installation quality.

[0055] For the window sash and glass, a waterproof and vapor barrier membrane is also arranged, but the method is different from that of the window frame. At the sealing strip part of the window sash edge, the waterproof and vapor barrier membrane can be attached to the inner side of the strip to form a continuous protection system with the membrane on the window frame. When the window is closed, the membranes of the window sash and the window frame are in close contact to prevent water vapor penetration. For the glass, at the installation connection parts between the glass and the window frame and the window sash, the waterproof and vapor barrier membrane is arranged around the edge of the glass. Through cooperation with the glass sealant, it prevents water vapor from entering through the gaps around the glass. For example, butyl rubber is used as the glass sealant, which has excellent water vapor barrier performance. Combined with the waterproof and vapor barrier membrane, it can effectively seal the glass installation part, ensuring that even in an environment with large temperature differences and high humidity, water vapor penetration between various components of the window can be prevented, maintaining the stability of the indoor environment, and ensuring the energy-saving and waterproof and vapor barrier functions of the passive window in the building envelope of nearly zero energy consumption buildings.

[0056] The original wall of the modular building is a metal-faced thermal insulation sandwich panel structure, whose materials mainly include a metal surface layer and a thermal insulation core material, playing an important role in enclosure, heat insulation and heat preservation in the modular building.

[0057] The metal-faced thermal insulation sandwich panel usually uses double-layer metal plates as the surface layer, with a thermal insulation core material in the middle. This sandwich structure forms a relatively stable wall structure, having a certain strength and stiffness, and being able to bear its own gravity and a certain degree of external loads, such as wind force, etc. During the assembly process of the modular building, the original wall is connected to other building components (such as columns, top beams, bottom beams, etc.) through standardized connectors, ensuring the integrity and stability of the entire building structure. For example, at the construction sites of some common modular buildings, the installation of the original wall is convenient and efficient, and its connection with the frame structure is tight, being able to quickly build the basic enclosure system of the building.

[0058] The metal surface layer generally selects color-coated steel plates with a thickness between 0.35 mm and 0.5 mm. This kind of steel plate has good corrosion resistance and decorative properties, being able to protect the internal thermal insulation core material and meet the building appearance requirements. The thermal insulation core material mainly has two types: glass wool and rock wool. The bulk density of glass wool is 64 kg / m 2 , and the fire protection grade is A; the bulk density of rock wool is 120 kg / m 2 , the fire protection grade is also A and the sound absorption coefficient is 0.73. These thermal insulation core materials have a low thermal conductivity, being able to effectively prevent the transfer of heat on both sides of the wall, playing a key role in maintaining the stability of the indoor thermal environment, and being an important part of realizing the thermal insulation performance of the modular building.

[0059] After removing the original wall of the modular building, it is mainly utilized from two aspects: the roof and the ground, giving full play to its material characteristics, improving the functionality and moisture-proof and drainage performance of the building, and effectively reducing resource waste.

[0060] Cut a part of the original wall to be demolished and place it on the roof for slope finding. In the roof drainage design, slope finding is a key link. Due to its own structural and strength characteristics, the original wall material can form a certain slope on the roof to ensure that rainwater can flow smoothly to the drainage outlet after accumulating on the roof, avoiding waterlogging that may cause roof leakage or structural damage. After slope finding is completed, use the original exterior wall panel to cut grooves on the roof to form a drainage ditch, and then lay a layer of waterproof coiled material on it to further enhance the waterproof performance of the roof drainage system, ensure that rainwater can be effectively collected and discharged through the original rainwater outlet, maintain the smoothness and stability of roof drainage, and prevent rainwater penetration from affecting the internal environment of the building.

[0061] Another part of the original wall is placed below the ground, playing multiple roles of protection, moisture-proof and waterproof. The ground is in long-term contact with the water vapor in the soil. The original wall material can effectively block the upward penetration of water vapor, prevent the ground from getting damp and deforming, and protect the ground structure and the dryness of the indoor environment. During the construction process, the original wall is closely combined with other ground structures, such as working together with the newly added ground insulation decorative board and the waterproof vapor barrier membrane to form a complete ground moisture-proof and waterproof system, enhancing the durability and stability of the ground, providing guarantee for the nearly zero energy consumption performance of the modular building as a whole, and reducing problems such as heat loss and increased energy consumption caused by ground dampness.

[0062] In the renovation of the modular building envelope based on nearly zero energy consumption, the renovated structure of the roof part retains the original roof and adds measures such as insulation decorative boards to improve the insulation and energy-saving effect while ensuring the normal drainage function and maintaining the overall performance of the building.

[0063] After retaining the original roof, the insulation decorative board covered on its upper part plays a key role in heat insulation. The waterproof vapor barrier membrane pre-laid on the side of the insulation decorative board close to the indoor side in the factory is crucial. In the factory production process, high-performance waterproof vapor barrier membrane materials such as polyethylene (PE) or polypropylene (PP) are used, and through professional pasting processes, they are closely attached to the non-decorative layer side of the insulation decorative board to ensure the water vapor barrier effect. At the building assembly site, when installing this insulation decorative board on the roof, its waterproof vapor barrier membrane needs to be carefully sealed with the waterproof vapor barrier membrane of the exterior wall. Usually, sealing tapes or sealants are used for bonding and sealing, such as butyl rubber sealing tapes. Because of their good adhesiveness, weather resistance and water vapor barrier properties, they can effectively prevent water vapor from penetrating into the insulation layer, ensure the airtight performance of the building, reduce heat transfer, maintain the stability of the indoor thermal environment, and meet the requirements of nearly zero energy consumption buildings.

[0064] Drainage structures are provided at the four corners of the roof slab. Use the original wall panel to be demolished to cut grooves on the roof slab to form a drainage ditch, cover it with waterproof coiled material, and connect the drainage ditch to the original rainwater outlet of the modular building; there is a rainwater ditch at the edge of the original roof, and a drainage board is buckled outside the rainwater ditch to cover the gap between the roof and the renovated wall panel.

[0065] When adding thermal insulation and decorative panels to the roof, strictly maintain the original drainage direction unchanged, which is based on the rationality of the original modular building drainage system design. The original drain outlet is in a key position in the entire drainage system. After the water converges, the rainwater can still be smoothly discharged from this drain outlet, ensuring smooth roof drainage and avoiding water accumulation from damaging the roof structure. During the construction process, the original drain outlet and its surrounding areas will be inspected and cleaned to ensure no debris blockage. At the same time, when installing the thermal insulation and decorative panels, reasonable splicing and sealing will be carried out according to the drainage path to prevent rainwater from leaking into the internal structure of the roof, ensuring the waterproof performance and structural integrity of the roof and maintaining the normal use function of the building.

[0066] The roof rainwater gutter is usually located at the edge of the original modular building roof or on the preset drainage path. It is a structure originally designed for collecting and guiding roof rainwater to drain out in the building. It is connected to the roof drainage system, and its position and orientation have been determined during the initial design and construction of the building. Generally, it follows the slope direction of the roof and leads to the building's drain outlet, ensuring that the rainwater can be drained out of the roof in an orderly manner and preventing water accumulation from damaging the roof structure.

[0067] The drainage gutter formed by grooving is formed by grooving on the roof using the removed original modular building exterior wall panels during the roof renovation process. Its position is determined according to the drainage requirements and roof layout after renovation, usually in areas where the drainage effect needs to be enhanced or the drainage flow direction needs to be adjusted. After adding thermal insulation and decorative panels to the roof, in order to better guide the rainwater to flow towards the original rainwater outlet, a drainage gutter will be formed by grooving the original exterior wall panels at appropriate positions and waterproof coiled materials will be laid for waterproof treatment, enabling the rainwater to be smoothly discharged through the original rainwater outlet and working together with the original roof rainwater gutter to complete the roof drainage function, but there are obvious differences in their positions and formation methods.

[0068] The plinth can effectively prevent the erosion and scouring of rainwater, ground water, etc. on the base of the wall, reduce the possibility of the wall being affected by moisture, freezing, etc., and protect the stability and durability of the wall structure. For example, in some rainy areas or places prone to water accumulation, the existence of the plinth can significantly extend the service life of the wall.

[0069] The plinth can form a contrasting or harmonious visual effect with the upper wall by adopting different materials, colors, textures or shapes, etc., enhancing the overall aesthetic degree of the building and the expressiveness of the architectural style, and improving the appearance image of the building. Common plinth materials include stone, brick, concrete, etc., and their decorative effects are each unique. Similarly, decorative layers are also provided on the updated outer leaf panels and updated roof panels.

[0070] It solves the problems of thin thermal insulation layer and large heat transfer coefficient of the enclosure structure in existing modular buildings. By updating the enclosure structure components such as the floor slab, wall panel and roof panel, and adding an efficient thermal insulation layer, it meets the indoor environmental requirements of nearly zero-energy buildings. It significantly improves the energy utilization efficiency of modular buildings, reduces energy consumption, makes the building closer to the nearly zero-energy standard, and reduces energy consumption and operating costs.

[0071] It enhances the thermal insulation performance and airtightness of the building, improves the stability and comfort of the indoor environment, and provides a more suitable living or working space for users. By using the original wall panels removed for roof slope finding and ground moisture-proof and waterproofing treatments, etc., the reasonable reuse of materials is realized, the construction cost and resource waste are reduced, and it has good economic and environmental benefits.

[0072] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A modular building renovation construction method based on near-zero energy consumption, characterized in that: include: The original wall panels of the modular building are removed to expose the side frames of the modular building. The original wall panels are used for the original roof slope and are placed below the ground for the modular building construction; Fix the updated floor panels bonded with waterproof vapor barrier membranes to the bottom of the original floor, fix the updated outer leaf panels and the inner leaf panels bonded with waterproof vapor barrier membranes to the side frames to form updated wall panels with reserved air layers in the middle, and fix the updated roof panels bonded with waterproof vapor barrier membranes to the top of the original roof; The waterproof vapor barrier membranes on the roof panels and the inner leaf panels are sealed and connected to form a continuous waterproof airtight layer; The foundation and ground cushion are constructed in the modular building construction area, the dismantled original wall panels are placed on the ground cushion, and the updated modular building is placed on the foundation.

2. The modular building renovation construction method based on near-zero energy consumption as claimed in claim 1, characterized in that: The side of the floor panel facing the bottom of the original floor is bonded with a waterproof vapor barrier membrane, the side of the inner leaf panel facing the outer leaf panel is bonded with a waterproof vapor barrier membrane, and the side of the roof panel facing the top of the original roof is bonded with a waterproof vapor barrier membrane.

3. The modular building renovation construction method based on near-zero energy consumption according to claim 1 or 2, characterized in that: After the inner leaf plates on four sides of the modular building are fixed, the waterproof vapor barrier membranes bonded on adjacent inner leaf plates are connected and continuously distributed.

4. The modular building renovation construction method based on near-zero energy consumption as claimed in claim 3 is characterized in that: Window keels are added to the window positions of the modular building to fix the passive windows. A waterproof vapor barrier film is bonded to the inner side of the passive window and is sealed and connected to the waterproof vapor barrier film on the inner leaf plate.

5. The modular building renovation construction method based on near-zero energy consumption as claimed in claim 1, characterized in that: The inner blade plate and the outer blade plate are respectively fixed on the keel of the side frame, and the corner plate is installed at the corner position of the outer blade plate and the plate seam is compacted to seal.

6. The modular building renovation construction method based on near-zero energy consumption as claimed in claim 1, characterized in that: The four corners of the roof panel are provided with drainage structures. The original wall panels removed are used to cut grooves on the roof panel to form drainage ditches, which are covered with waterproof membranes. The drainage ditches are connected to the original rainwater inlets of the modular building.

7. The modular building renovation construction method based on near-zero energy consumption as claimed in claim 6, characterized in that: A rain gutter is arranged at the edge of the original roof, and a drainage board is arranged outside the rain gutter to cover the gap between the roof and the updated wallboard.

8. The modular building renovation construction method based on near-zero energy consumption as claimed in claim 1, characterized in that: The modular building is assembled in a factory by removing the original wall panels and installing the updated structure, with installation space reserved around the modular building.

9. The modular building renovation construction method based on near-zero energy consumption as claimed in claim 8, characterized in that: After the modular building is split into multiple modules, the multiple modules are dismantled and updated respectively.

10. The modular building renovation construction method based on near-zero energy consumption according to claim 9, characterized in that: The updated modules are transported to the modular building construction area in modular form for assembly, and are then plinthed and installed using the removed original wall panel supports.

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