A non-light-transmitting curtain wall building energy-saving and fireproofing reinforcement integrated repairing system

Abstract

This utility model provides an integrated energy-saving and fire-resistant reinforcement system for existing non-transparent curtain wall buildings. It includes: a Class A asbestos-free calcium silicate fireproof partition installed on the outside of the base wall or insulation layer. The partition contains an air gap layer, within which a slow-release polyurethane layer is installed. This utility model features a simple and rational structure with strong overall integrity. Through the layered barrier design of the Class A asbestos-free calcium silicate fireproof partition and the use of slow-release polyurethane foam to fill the air gap layer, the heat transfer coefficient is reduced by ≥40%, while simultaneously improving the fire resistance of the system structure. It achieves the dual functions of "dense filling + fire-resistant partitioning." Without demolishing the existing curtain wall, it can simultaneously improve the energy-saving and fire-resistant performance of the curtain wall, making it particularly suitable for the repair and upgrading of non-transparent curtain walls such as stone and metal panels. Compared to demolition and reconstruction, it improves construction efficiency by more than 60%.

Description

Technical Field

[0001] This utility model relates to the field of building energy conservation and fire protection renovation technology, and in particular, to a repair technology for simultaneously improving the energy conservation and fire protection performance of existing non-transparent curtain wall buildings based on non-destructive processes; specifically, it relates to an integrated repair system for energy conservation and fire protection reinforcement of existing non-transparent curtain wall buildings. Background Technology

[0002] According to data provided by the China Building Energy Conservation Association, as of 2024, the total registered building area in China was approximately 67 billion square meters. Of this, residential and public buildings comprised approximately 40 billion square meters. Buildings using non-transparent curtain wall finishes (such as stone or metal panel curtain walls) accounted for about 20%, meaning there were approximately 8 billion square meters of such buildings. Of these non-transparent curtain wall buildings, 4 billion square meters were constructed before 2010 and lacked thermal insulation and energy-saving treatment. These non-transparent curtain wall buildings generally suffer from the following problems:

[0003] 1. Poor thermal performance: The air layer inside the curtain wall is not filled with insulation material, and the metal keel forms thermal bridges, resulting in a high overall heat transfer coefficient [usually ≥1.5 W / (㎡•K)], which leads to significant energy loss in the building.

[0004] 2. Some early stone curtain walls have problems such as weathering and cracking, and metal panel curtain walls have problems such as coating peeling and corrosion, which affect the appearance and safety of the building.

[0005] 3. The original curtain wall had no fireproof partitions inside, so flames could spread rapidly through the air layer during a fire, resulting in poor fire resistance and a significant fire hazard.

[0006] 4. Traditional renovations require the demolition of the facade, which has a long construction period (≥3 months), high cost (≥1800 yuan / ㎡), and affects the normal use of the building, making the renovation difficult.

[0007] In existing new non-transparent curtain wall buildings, rock wool boards are often used as the filling material for the gaps inside the curtain wall. However, this building technology has the following drawbacks:

[0008] 1. Rock wool filling has low density (≤80kg / m³), making it prone to moisture absorption and causing insulation failure;

[0009] 2. Rock wool boards are simply anchored to the structural wall, resulting in an unreliable connection that makes them prone to falling off from the inside.

[0010] 3. Rock wool boards are acidic and will corrode the connectors.

[0011] Currently, some have proposed filling the gaps inside the curtain wall with foamed materials, but this does not solve the problem of fire compartmentation; others have proposed using inorganic boards for exterior wall partitioning, but the construction process is complex and it is impossible to achieve fully enclosed filling.

[0012] To date, there are no relevant technologies or methods for comprehensively improving the fire protection and energy efficiency of existing non-transparent curtain wall buildings simultaneously. If existing curtain walls are to be renovated, demolished, or rebuilt, there are many complex issues such as planning problems, standards issues, and regulatory basis, and the amount of capital required is large and the solutions are difficult. Utility Model Content

[0013] Therefore, the purpose of this utility model is to propose an integrated energy-saving and fire-resistant reinforcement system for existing non-transparent curtain wall buildings. The system employs a design with layered, Class A asbestos-free calcium silicate fireproof partitions and a slow-release polyurethane foam-filled air gap layer, reducing the system's heat transfer coefficient by ≥40% while simultaneously improving the fire resistance of the system structure. This achieves the dual functions of "dense filling + fire-resistant partitioning." Without demolishing the existing curtain wall, the system simultaneously enhances both energy efficiency and fire resistance, increasing construction efficiency by over 60% compared to demolition and reconstruction.

[0014] This utility model provides an integrated repair system for energy conservation and fire protection of existing non-transparent curtain wall buildings, including: a Class A asbestos-free calcium silicate fireproof partition installed on the outside of the base wall or insulation layer, wherein the Class A asbestos-free calcium silicate fireproof partition contains an air gap layer, and a slow-release polyurethane layer is provided in the air gap layer.

[0015] Specifically, the slow-release polyurethane layer uses slow-release flexible polyurethane foam with an apparent density of 8-13 kg / m³, a thermal conductivity ≤0.040 W / (m•K), and a B1 fire rating. It employs a two-component design (MDI isocyanate + polyether polyol) and features delayed foaming characteristics (high initial flowability, slow growth after 8 seconds), ensuring it does not affect the load-bearing safety of the non-transparent curtain wall system while simultaneously ensuring dense filling of the air gaps (density ≥95%).

[0016] The delayed foaming properties of the slow-release polyurethane layer, combined with the layered barrier of the Class A asbestos-free calcium silicate fireproof partition, achieve the dual functions of "dense filling + fireproof partitioning".

[0017] Preferably, an endoscope is used to monitor the filling process in real time and accurately locate the thermal bridge area.

[0018] Preferably, infrared thermal imaging technology is used to generate thermal defect maps and automatically optimize the filling scheme;

[0019] The fire resistance limit of the existing non-transparent curtain wall building energy-saving and fire-resistant reinforcement integrated repair system of this utility model has been verified by the physical fire test of GB / T29416-2012.

[0020] Furthermore, the dimensions of the Class A asbestos-free calcium silicate fireproof partition match the partition joints of the base wall; the Class A asbestos-free calcium silicate fireproof partition has an injection notch near the edge of the partition joint for injecting the slow-release polyurethane layer.

[0021] The injection notch is used as a spraying channel for slow-release polyurethane. By pre-designing the injection notch for the Class A asbestos-free calcium silicate fireproof partition, the secondary drilling required when filling the insulation material in traditional processes is avoided, reducing construction damage.

[0022] Furthermore, each of the Class A asbestos-free calcium silicate fireproof partitions has multiple injection notches, and the multiple injection notches are evenly distributed along the length edge or width edge of the Class A asbestos-free calcium silicate fireproof partition.

[0023] Furthermore, the thickness of the Class A asbestos-free calcium silicate fireproof partition is 6-10mm.

[0024] Preferably, the thickness of the Class A asbestos-free calcium silicate fireproof partition is 8mm, the flexural strength is ≥8MPa, and the fire resistance limit is ≥1.0h.

[0025] Furthermore, the length and width of the injection notch are equal, with the length or width being 25mm-35mm respectively.

[0026] Preferably, the size of the injection notch is 30mm × 30mm.

[0027] The air gap inside the Class A asbestos-free calcium silicate fireproof partition is filled by injecting glue into the notch, shortening the construction period to 15 days compared to the traditional process (the traditional process takes ≥45 days).

[0028] Furthermore, after the slow-release polyurethane is applied, a silicone weather-resistant sealant structure is provided at the injection notch.

[0029] Preferably, the tensile modulus of the silicone weather-resistant sealant structure is ≥0.4MPa, the elongation at break is ≥200%, and the color matches the existing curtain wall (supports RAL color card color matching).

[0030] Furthermore, the outer side of the Class A asbestos-free calcium silicate fireproof partition is provided with a decorative layer to isolate it from external environmental erosion.

[0031] The finishing layer can effectively isolate external environmental factors such as rain, snow, and ultraviolet rays, preventing damage to the main building structure and thus extending its service life.

[0032] Furthermore, the Class A asbestos-free calcium silicate fireproof partition is equipped with an installation keel, which is fixedly installed on the base wall or insulation layer by connectors.

[0033] Compared with the prior art, the beneficial effects of this utility model are:

[0034] This utility model provides an integrated energy-saving and fire-resistant reinforcement system for existing non-transparent curtain wall buildings. Its structure is simple and rational, with strong overall integrity. Through the design of layered A-grade asbestos-free calcium silicate fireproof partitions and a structure using slow-release polyurethane foam to fill air gaps, the heat transfer coefficient is reduced by ≥40%, while simultaneously improving the fire resistance of the system structure. This achieves the dual functions of "dense filling + fire-resistant partitioning." Without demolishing the existing curtain wall, it can simultaneously improve the energy-saving and fire-resistant performance of the curtain wall. It is particularly suitable for the repair and upgrading of non-transparent curtain walls such as stone and metal panels, increasing construction efficiency by more than 60% compared to demolition and reconstruction, and has broad application prospects. Attached Figure Description

[0035] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention.

[0036] In the attached diagram:

[0037] Figure 1 This is a structural cross-sectional view of an existing non-transparent curtain wall building energy-saving and fire-resistant reinforcement integrated repair system according to an embodiment of the present utility model.

[0038] Figure 2 This is another structural cross-sectional view of the existing non-transparent curtain wall building energy-saving and fire-resistant reinforcement integrated repair system according to an embodiment of the present utility model.

[0039] Figure 3 This is a structural diagram of the glue injection notch in an embodiment of the present invention;

[0040] Figure 4 This is a schematic diagram of the polyurethane filling equipment and process according to an embodiment of the present utility model.

[0041] The markings in the attached figure are as follows:

[0042] 1. Base wall, 2. Insulation layer, 3. Air gap layer, 4. Class A asbestos-free calcium silicate fireproof partition, 5. Finishing layer, 6. Silicone weather-resistant sealant structure, 7. Injection notch, 8. Polyurethane spraying equipment, 9. Nozzle, 10. Connector, 11. Main keel, 12. Secondary keel. Detailed Implementation

[0043] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this disclosure. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this disclosure as detailed in the appended claims.

[0044] The terminology used in this disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. The singular forms “a,” “the,” and “the” as used in this disclosure and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any and all possible combinations of one or more of the associated listed items.

[0045] It should be understood that although the terms first, second, and third may be used in this disclosure to describe various information, such information should not be limited to these terms. These terms are used only to distinguish information of the same type from one another. For example, without departing from the scope of this disclosure, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Depending on the context, the word "if" as used herein may be interpreted as "when," "when," or "in response to determination."

[0046] This utility model embodiment provides an integrated repair system for energy conservation and fireproofing of existing non-transparent curtain wall buildings. See [link to relevant documentation]. Figure 1 , Figure 2 As shown, the fire-resistant partition 4, consisting of Class A asbestos-free calcium silicate, is installed on the outside of the base wall 1 or the insulation layer 2. The dimensions of the Class A asbestos-free calcium silicate fire-resistant partition 4 match the partition joints of the base wall 1. The Class A asbestos-free calcium silicate fire-resistant partition 4 is equipped with a mounting frame, which includes a main frame 11 and a secondary frame 12. The mounting frame is fixed to the base wall 1 or the insulation layer 2 via connectors 10.

[0047] The Class A asbestos-free calcium silicate fireproof partition 4 contains an air gap layer 3, within which a slow-release polyurethane layer is installed. Near the edge of the partition joint, the Class A asbestos-free calcium silicate fireproof partition 4 has an injection notch 7 for applying the slow-release polyurethane layer (e.g., ...). Figure 3(As shown). Each Class A asbestos-free calcium silicate fireproof partition 4 has two injection notches 7, which are evenly distributed along the length or width edge of the Class A asbestos-free calcium silicate fireproof partition 4. The injection notches 7 serve as spray channels for the slow-release polyurethane. By pre-designing the injection notches 7 of the Class A asbestos-free calcium silicate fireproof partition 4, the secondary opening required in the traditional process of filling the insulation material is avoided, reducing construction damage. The slow-release polyurethane layer uses slow-release flexible polyurethane foam with an apparent density of 8-13 kg / m³, a thermal conductivity ≤0.040 W / (m•K), and a fire rating of B1. It adopts a two-component structure (isocyanate MDI + polyether polyol) with delayed foaming characteristics (high initial fluidity, slow growth after 8 seconds), which does not affect the load-bearing safety of the non-transparent curtain wall system, while ensuring the dense filling of the gaps in the air gap layer 3 (density ≥95%).

[0048] The delayed foaming characteristics of the slow-forming polyurethane layer, combined with the layered barrier of the Class A asbestos-free calcium silicate fireproof partition 4, achieve the dual functions of "dense filling + fire-resistant partitioning". The fire resistance limit of the existing non-transparent curtain wall building energy-saving and fire-resistant reinforcement integrated repair system of this utility model has been verified by the physical fire test of GB / T29416-2012.

[0049] The Class A asbestos-free calcium silicate fireproof partition 4 has a thickness of 8mm, a flexural strength ≥8MPa, and a fire resistance limit ≥1.0h. The length and width of the injection notch 7 are equal, and the dimensions of the injection notch 7 are 30mm×30mm. The air gap layer 3 inside the Class A asbestos-free calcium silicate fireproof partition 4 is filled through the injection notch 7, shortening the construction cycle to 15 days compared to the traditional process (the traditional process takes ≥45 days).

[0050] After applying slow-release polyurethane, a silicone weather-resistant sealant structure 6 is installed at the injection notch 7. The silicone weather-resistant sealant structure 6 has a tensile modulus ≥0.4MPa, an elongation at break ≥200%, and matches the color of the existing curtain wall (supports RAL color matching). A finishing layer 5 is installed on the outer side of the Class A asbestos-free calcium silicate fireproof partition 4 to isolate it from external environmental erosion. The finishing layer 5 effectively isolates rain, snow, ultraviolet rays, and other corrosive factors from the external environment, preventing damage to the building structure and thus extending its service life.

[0051] The integrated energy-saving and fire-resistant reinforcement system for existing non-transparent curtain wall buildings in this embodiment has a simple and reasonable structure with strong overall integrity. By designing a layered barrier with Class A asbestos-free calcium silicate fireproof partitions and a structure with slow-release polyurethane foam filling the air gap layer, the heat transfer coefficient is reduced by ≥40%, while improving the fire resistance of the system structure. It achieves the dual functions of "dense filling + fire-resistant partitioning". Without demolishing the existing curtain wall, it can simultaneously improve the energy-saving and fire-resistant performance of the curtain wall. It is especially suitable for the repair, upgrading and renovation of non-transparent curtain walls such as stone and metal panels, and the construction efficiency is improved by more than 60% compared with demolition and reconstruction.

[0052] This embodiment, in its practical application during the renovation of a building (curtain wall area 12,000㎡), includes the following processes:

[0053] Materials include slow-release polyurethane [thermal conductivity 0.040W / (m•K)], Class A asbestos-free calcium silicate fireproof partition (8mm thick), and gray silicone weather-resistant sealant.

[0054] Endoscopic examination revealed an average thickness of 80 mm for air gap layer 3, and 158 thermal bridge areas were identified. After installing the Class A asbestos-free calcium silicate fireproof partition 4, as... Figure 4 As shown, using polyurethane spraying equipment 8, slow-release polyurethane was applied in three rounds through nozzles 9, with a 30-second interval between each round, resulting in a final filling density of 98%.

[0055] Infrared thermal imaging was used to inspect the curtain wall structure containing the slow-release polyurethane layer. The results showed that the heat transfer coefficient decreased from 1.5 W / (㎡•K) to 0.8 W / (㎡•K), resulting in an energy saving rate of 47%.

[0056] The combustion test was conducted in accordance with the "Test Method for Fire Resistance Performance of External Wall Insulation Systems" (GB / T29416-2012), and the fire resistance test of the external wall insulation system was fully met.

[0057] The construction method in this embodiment includes the following steps:

[0058] The thickness of the air gap and the distribution of connectors in the curtain wall are examined using an endoscope (resolution ≥1080P). Thermal bridge areas are marked, the existing original joint sealant and backing material are removed, and the base wall is cleaned until there are no residues.

[0059] Install Class A asbestos-free calcium silicate fireproof partition 4: Cut Class A asbestos-free calcium silicate fireproof partition 4 according to the size of the partition joint, and leave a notch for glue injection 7.

[0060] Slow-blown polyurethane filling: Slow-blown polyurethane is sprayed into the gaps of the air spacer layer 3 through the injection notch 7, controlling the foaming rate to an initial flow rate ≥ 0.5 L / min and an expansion ratio ≥ 30 times, filling in 3 rounds (with a 30-second interval between each round), and the filling density ≥ 95%;

[0061] A polystyrene round rod backing (diameter = gap width × 1.3) was embedded, and silicone weather-resistant sealant was injected to seal the Class A asbestos-free calcium silicate fireproof partition. The uniformity of the slow-type polyurethane filling was detected by an infrared thermal imager (accuracy ±0.1℃). The test results showed that the heat transfer coefficient decreased by ≥40%, and the acceptance was completed.

[0062] The technical solution of this utility model has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the protection scope of this utility model is obviously not limited to these specific embodiments. Without departing from the principle of this utility model, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the protection scope of this utility model.

[0063] The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An integrated repair system for energy conservation and fireproofing of existing non-transparent curtain wall buildings, characterized in that, include: A Class A asbestos-free calcium silicate fireproof partition is installed on the outside of the base wall or insulation layer. The Class A asbestos-free calcium silicate fireproof partition contains an air gap layer, and the air gap layer contains a slow-release polyurethane layer.

2. The integrated energy-saving and fire-resistant reinforcement system for existing non-transparent curtain wall buildings according to claim 1, characterized in that, The dimensions of the Class A asbestos-free calcium silicate fireproof partition match the partition joints of the base wall; the Class A asbestos-free calcium silicate fireproof partition has an injection notch near the edge of the partition joint for injecting the slow-release polyurethane layer.

3. The integrated energy-saving and fire-resistant reinforcement system for existing non-transparent curtain wall buildings according to claim 2, characterized in that, Each of the Class A asbestos-free calcium silicate fireproof partitions has multiple injection notches, which are evenly distributed along the length or width edge of the Class A asbestos-free calcium silicate fireproof partition.

4. The integrated energy-saving and fire-resistant reinforcement system for existing non-transparent curtain wall buildings according to claim 2, characterized in that, The thickness of the Class A asbestos-free calcium silicate fireproof partition is 6-10mm.

5. The integrated energy-saving and fire-resistant reinforcement system for existing non-transparent curtain wall buildings according to claim 4, characterized in that, The length and width of the injection notch are equal, with the length or width being 25mm-35mm respectively.

6. The integrated energy-saving and fire-resistant reinforcement system for existing non-transparent curtain wall buildings according to claim 2, characterized in that, After the slow-release polyurethane is injected, a silicone weather-resistant sealant structure is provided at the injection notch.

7. The integrated energy-saving and fire-resistant reinforcement system for existing non-transparent curtain wall buildings according to claim 1, characterized in that, The exterior of the Class A asbestos-free calcium silicate fireproof partition is provided with a decorative layer to isolate it from external environmental erosion.

8. The integrated energy-saving and fire-resistant reinforcement system for existing non-transparent curtain wall buildings according to claim 1, characterized in that, The Class A asbestos-free calcium silicate fireproof partition is equipped with an installation keel, which is fixedly installed on the base wall or insulation layer by connectors.

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