Near-zero-energy-consumption building indoor ground deformation joint airtight construction device

Abstract

The invention relates to a near-zero-energy-consumption building indoor ground deformation joint airtight construction device, which relates to the field of building energy conservation, and comprises an insulation board fixedly arranged in a concrete deformation joint; the surface layer plate is fixedly mounted on the concrete structure; the two ends of the waterproof coiled material are fixedly connected with the surface layer plate; the upper bearing assembly comprises first mounting bases and a cover plate, the two first mounting bases are fixedly mounted at the two ends of the waterproof roll correspondingly, the cover plate is arranged between the two first mounting bases in a sliding mode, and the lower bearing assembly is fixedly mounted in a deformation joint below the heat preservation plate; the two sides of the first waterproof vapor-proof film are fixedly mounted between the waterproof coiled material and the concrete structure; the weather-proof sealant is poured into a gap between the surface layer plate and the waterproof coiled material; the fire-retardant belt is fixedly mounted on the lower bearing assembly; the two sides of the second waterproof vapor-proof film are fixedly installed on the lower bearing assembly. The stability and reliability of the building indoor ground airtight structure can be improved.

Description

Technical Field

[0001] This invention relates to the technical field of building energy conservation, and in particular to an airtight structural device for indoor floor expansion joints in near-zero energy buildings. Background Technology

[0002] With the continuous improvement of building energy efficiency standards, near-zero energy buildings have become an important direction for my country's building development. The overall airtightness of a building is one of the core technical characteristics of near-zero energy buildings. Good airtightness can effectively reduce the cold and heat load caused by cold air infiltration in winter and uncontrolled ventilation in summer, significantly reducing the energy consumption of building heating and air conditioning, which is a necessary prerequisite for achieving the near-zero energy goal.

[0003] In interior building construction, floor expansion joints are necessary structural joints designed to accommodate temperature deformation, settlement deformation, and seismic displacement of the building structure. However, since expansion joints penetrate the floor slab, they form potential channels for indoor and outdoor air exchange, and the effectiveness of their airtight joint treatment directly affects the overall airtightness performance of the building. Therefore, the airtight structural design of expansion joints is a key and challenging aspect of the airtightness design of near-zero energy building envelopes.

[0004] Currently, Chinese invention patent CN109267709B, published on January 25, 2019, proposes a leak-proof structure and repair method for expansion joints. The method includes a multi-layer sealing leak-proof structure comprising an elastic filler material, a sealant filling layer, a flexible waterproof material layer, a pressure strip, and a structural layer. The elastic filler material and sealant form a first-layer seal, while the flexible waterproof material layer and pressure strip form a second-layer seal, combined with a water-stop groove and sealant. This ensures that the sealing performance of the expansion joint is not compromised during deformation.

[0005] Regarding the aforementioned technologies, since indoor floors require daily cleaning and maintenance, including activities such as sun-drying and mopping, moisture can easily seep into the expansion joints through the seams of the surface material or through capillary action. Traditional flexible waterproofing materials, after prolonged exposure to moisture, are prone to mold growth, powdering, and strength reduction, leading to a significant decrease in their airtightness or even complete failure. This makes them unable to meet the stringent requirements for long-term, stable, and reliable airtightness in building interiors. Summary of the Invention

[0006] To improve the stability and reliability of airtight structural features for building interior floors, this invention provides a near-zero energy consumption airtight structural device for building interior floor expansion joints.

[0007] This invention provides an airtight structural device for indoor floor expansion joints in near-zero energy buildings, employing the following technical solution: A near-zero energy building indoor floor expansion joint airtight structural device includes: Insulation boards are fixedly installed inside the expansion joints of the concrete. The surface layer plate is fixedly installed on the upper concrete structure of the expansion joint; The waterproof membrane is fixedly connected to the side of the surface layer at both ends, and has a metal film attached to its surface. The support mechanism includes an upper support assembly and a lower support assembly. The upper support assembly includes a first mounting seat and a cover plate. The two first mounting seats are respectively fixedly installed at both ends of the waterproof membrane. The cover plate is slidably disposed between the two first mounting seats. The lower support assembly is fixedly installed in the expansion joint below the insulation board. The first waterproof vapor barrier membrane is fixedly installed on both sides between the waterproof membrane and the concrete structure, with the middle section being arc-shaped. Weather-resistant adhesive is injected into the gap between the surface layer and the waterproof membrane. The fire-resistant strip is fixedly installed on the lower support assembly, with one end abutting against the bottom end of the insulation board; The second waterproof and vapor barrier membrane is fixedly installed on both sides of the lower support assembly, with the middle section being arc-shaped.

[0008] Preferably, the lower support assembly includes a second mounting base and a base plate. Two second mounting bases are fixedly installed on the concrete structure at both ends of the expansion joint. The upper end of the base plate is slidably installed on the second mounting bases. The fire-resistant strip is fixedly installed on the top end of the second mounting bases.

[0009] Preferably, a first elastic rubber strip is fixedly installed between the two sides of the cover plate and the first mounting base.

[0010] Preferably, a waterproof baffle is fixedly installed on the surface layer, the two ends of the waterproof baffle are set at a certain angle, the upper end of the waterproof baffle is fixedly connected to the side of the surface layer, the first mounting base is fixedly connected to the waterproof baffle, and the lower end of the waterproof baffle is fixedly installed on the bottom end of the surface layer.

[0011] Preferably, the lower end of the waterproof baffle extends into a sub-plate in a direction away from the surface plate, the upper end of the sub-plate is fixedly connected to the first waterproof vapor barrier membrane, and the lower end of the sub-plate is fixedly connected to the concrete structure.

[0012] Preferably, the cover plate extends into extension plates on both sides, and the extension plates are located above the surface layer plate.

[0013] Preferably, a second elastic strip is fixedly provided between the side end of the extension plate and the side end of the surface plate.

[0014] Preferably, the first mounting base has a first sliding groove, and the bottom end of the cover plate is fixedly mounted with a first sliding block, which slides within the first sliding groove; the second mounting base has a second sliding block fixedly mounted, and the bottom plate has a second sliding groove, which slides within the second sliding groove.

[0015] Preferably, the waterproof membrane has sealing sections extending from both sides, and the sealing sections are disposed between the surface plate, the extension plate and the waterproof baffle; the first mounting base is fixedly connected to the waterproof baffle by means of a fixing bolt.

[0016] Preferably, a ventilation pipe is connected to the gap between the first waterproof vapor barrier membrane and the waterproof roll material, and a fan is connected to the other end of the ventilation pipe. A humidity sensor is installed in the gap and is electrically connected to the fan. An air outlet pipe is connected to the other end of the gap and a one-way valve is installed on the air outlet pipe.

[0017] In summary, the present invention has at least one of the following beneficial technical effects: 1. By setting the first and second waterproof vapor barrier membranes at the top and bottom of the expansion joint respectively, two independent airtight defense lines are formed. Even if the upper layer is damaged due to accident, the lower layer can still maintain airtightness, which significantly improves the reliability of the system.

[0018] 2. Weather-resistant adhesive is injected into the gap between the surface layer and the waterproof membrane to form a flexible seal. This seal adapts to the expansion and contraction of the material caused by temperature changes, preventing moisture from seeping in from the edges of the surface layer. Simultaneously, in conjunction with the waterproof membrane, it further blocks moisture from entering the gaps of the first waterproof vapor barrier, significantly improving the sealing and waterproofing effect. This reduces the occurrence of water accumulation, mold growth, and oxidation / powdering of the first waterproof vapor barrier, extending its service life and improving the reliability and stability of the expansion joint airtight structure under long-term use conditions.

[0019] 3. The first elastic strip utilizes elastic deformation to cooperate with the sliding of the cover plate, maintaining contact pressure during the sliding process of the cover plate to achieve continuous sealing of the moving parts. This achieves the effect of both sliding and sealing, reducing the possibility of moisture intrusion into the waterproof membrane and improving the sealing effect.

[0020] 4. The waterproof baffle is set at an angle at both ends to form a guiding slope, which directs the water used for cleaning the ground away from the expansion joint. The waterproof baffle forms a lateral enclosure structure, which reduces the chance of water vapor directly contacting the waterproof membrane. It blocks water that may seep out from the surface layer, reduces the possibility of water seeping into the first waterproof vapor barrier, and reduces the possibility of the first waterproof vapor barrier becoming excessively damp and moldy.

[0021] 5. The active dehumidification mechanism significantly extends the service life of the waterproof vapor barrier membrane, reduces maintenance frequency, and ensures the long-term overall airtightness of the building. Continuous monitoring data from humidity sensors can be used to assess system operating status, enable predictive maintenance, and promptly detect potential seal failures. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of the present invention; Figure 2 yes Figure 1 A schematic diagram of the upper right corner; Figure 3 This is a schematic diagram of the lower support component; Figure 4 This is a schematic diagram of the overall structure of Embodiment 2 of the present invention; Figure 5 yes Figure 4 A schematic diagram of the upper right corner; Figure 6 This is a schematic diagram of the cross-sectional view centered on the expansion joint.

[0023] Explanation of reference numerals in the attached drawings: 101, Insulation board; 102, Surface panel; 103, Expansion joint; 104, Waterproof membrane; 105, First waterproof vapor barrier; 106, Second waterproof vapor barrier; 107, Weather-resistant adhesive; 108, Fire-resistant strip; 109, Waterproof baffle; 110, Sub-plate; 111, Sealing section; 200, Supporting mechanism; 210, Upper support assembly; 211, First mounting base; 212, Cover plate; 213, First elastic rubber strip; 2 14. Extension plate; 215. Second elastic rubber strip; 216. First sliding groove; 217. First sliding block; 218. Fixing bolt; 220. Lower support assembly; 221. Second mounting base; 222. Base plate; 223. Second sliding block; 224. Second sliding groove; 301. Ventilation duct; 302. Fan; 303. Humidity sensor; 304. Gap; 305. One-way valve; 306. Air outlet duct; 400. Concrete structure. Detailed Implementation

[0024] The following is in conjunction with the appendix Figure 1 To be continued Figure 6 The technical solutions in the embodiments of the present invention are clearly and completely described herein. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0025] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0026] Furthermore, in this invention, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0027] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0028] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0029] Example 1: This invention discloses an airtight structural device for indoor floor expansion joints in near-zero energy buildings. (Refer to...) Figures 1 to 3 A near-zero energy building indoor floor deformation joint airtight structure device mainly includes: insulation board 101, which is fixedly installed in the concrete deformation joint 103. The insulation board 101 can be made of rock wool material. The surface panel 102 is fixedly installed on the upper end of the concrete structure 400 of the expansion joint 103; Waterproof membrane 104 is fixedly connected to the side of surface panel 102 at both ends, and has a metal film on its surface. The support mechanism 200 includes an upper support component 210 and a lower support component 220. The upper support component 210 includes a first mounting base 211 and a cover plate 212. The two first mounting bases 211 are respectively fixedly installed at both ends of the waterproof membrane 104, and the cover plate 212 is slidably disposed between the two first mounting bases 211. The lower support component 220 is fixedly installed in the expansion joint 103 below the insulation board 101. The first waterproof vapor barrier membrane 105 is fixedly installed on both sides between the waterproof membrane 104 and the concrete structure 400, and the middle section is set in an arc shape. Weather-resistant adhesive 107 is injected into the gap between the surface layer 102 and the waterproof membrane 104. Fire-resistant strip 108 is fixedly installed on the lower support assembly 220, with one end abutting against the bottom end of insulation board 101; The second waterproof vapor barrier membrane 106 is fixedly installed on both sides of the lower support assembly 220, and the middle section is set in an arc shape.

[0030] The first waterproof vapor barrier 105 and the second waterproof vapor barrier 106 are respectively installed at the upper and lower parts of the expansion joint 103, forming two independent airtight defense lines. Even if the upper layer is damaged due to accident, the lower layer can still maintain airtightness, significantly improving the system reliability. The surface of the waterproof membrane 104 is covered with a metal film, which can be an aluminum film. This film not only blocks the downward penetration of clean water vapor from the ground, but also reduces radiative heat transfer by utilizing the reflective properties of metal, thus reducing the thermal bridging effect at the expansion joint 103. The middle sections of the first waterproof vapor barrier 105 and the second waterproof vapor barrier 106 are both arc-shaped, with reserved expansion and contraction allowances to adapt to the temperature deformation and settlement deformation of the building structure, preventing airtightness failure due to stretching and tearing of the membrane material. The upper support component 210 adopts a structure in which the cover plate 212 is slidably installed between the first mounting base 211, allowing relative displacement between the surface plate 102 and the concrete structure 400, ensuring the normal expansion and contraction function of the expansion joint 103 while maintaining the continuity of the upper cover. Weather-resistant adhesive 107 is injected into the gap between the surface layer 102 and the waterproof membrane 104 to form a flexible seal. This seal adapts to the expansion and contraction of the material caused by temperature changes, preventing moisture from seeping in from the edge of the surface layer 102. At the same time, in conjunction with the waterproof membrane 104, it further blocks moisture from entering the gaps of the first waterproof vapor barrier 105, greatly improving the sealing and waterproofing effect. This reduces the occurrence of water accumulation, mold growth, oxidation, and powdering in the first waterproof vapor barrier 105, extends the service life of the first waterproof vapor barrier 105, and improves the reliability and stability of the expansion joint airtight structure in long-term use environments.

[0031] Reference Figures 1 to 3In some embodiments, the lower support assembly 220 includes a second mounting base 221 and a base plate 222. Two second mounting bases 221 are fixedly mounted on the concrete structure 400 at both ends of the expansion joint 103. The upper end of the base plate 222 is slidably mounted on the second mounting bases 221. A fire-resistant strip 108 is fixedly mounted on the top of the second mounting bases 221. The fire-resistant strip 108, fixed to the top of the second mounting bases 221, abuts against the bottom of the insulation board 101 to form a tight contact, ensuring that the expanding material effectively fills the gaps during a fire, improving the fire-stopping effect. The base plate 222 is slidably connected to the second mounting bases 221 and cooperates with the sliding structure of the upper cover plate 212 to form a double sliding system, fully adapting to structural deformation and preventing the bottom airtight layer from being damaged by shear.

[0032] Reference Figure 1 In some embodiments, a first elastic strip 213 is fixedly installed between the two sides of the cover plate 212 and the first mounting base 211.

[0033] When the spacing between the expansion joints 103 changes, the distance between the first mounting seats 211 at both ends of the cover plate 212 is squeezed or moved away from each other. When the distance changes, the first elastic rubber strip 213 uses elastic deformation to cooperate with the sliding of the cover plate 212. During the sliding process of the cover plate 212, the contact pressure is maintained to achieve continuous sealing of the moving parts. This achieves the effect of both sliding and sealing, reduces the possibility of water vapor intruding into the waterproof membrane 104, and improves the sealing effect.

[0034] The implementation principle of an airtight structural device for indoor floor expansion joints in near-zero energy buildings according to an embodiment of the present invention is as follows: The airtight structure of the expansion joint forms two independent airtight defense lines by setting the first waterproof vapor barrier membrane 105 and the second waterproof vapor barrier membrane 106 at the top and bottom of the expansion joint 103, thereby improving the reliability of the system. The weather-resistant adhesive 107 between the surface plate 102 and the waterproof membrane 104 expands and contracts with the flexible sealing adapter material, and works with the waterproof membrane 104 to block water vapor from seeping in. This not only prevents water vapor from seeping from the edge of the surface plate 102, but also protects the first waterproof vapor barrier membrane 105 from damage such as water accumulation and mold, thus extending its service life. The first elastic strip 213, through its elastic deformation, slides with the cover plate 212 and maintains contact pressure to achieve sealing of the moving parts, reducing the possibility of water vapor intruding into the waterproof membrane 104 and further enhancing the sealing effect.

[0035] Example 2: This invention discloses an airtight structural device for indoor floor expansion joints in near-zero energy buildings. (Refer to...) Figures 4 to 6The main difference between this embodiment and Embodiment 2 is that a waterproof baffle 109 is fixedly installed on the surface plate 102. The two ends of the waterproof baffle 109 are set at a certain angle. The upper end of the waterproof baffle 109 is fixedly connected to the side of the surface plate 102, and the first mounting base 211 is fixedly connected to the waterproof baffle 109. The lower end of the waterproof baffle 109 is fixedly installed at the bottom end of the surface plate 102. The waterproof baffle 109 is generally L-shaped. The lower end of the waterproof baffle 109 can be fixed with anchor bolts to secure it to the concrete structure 400, reducing the possibility of lateral slippage or displacement of the waterproof baffle 109.

[0036] The waterproof baffle 109 is set at both ends at an angle to form a guiding slope, which directs the water used for cleaning the ground away from the deformation joint 103. The waterproof baffle 109 forms a lateral enclosure structure, which reduces the chance of water vapor directly contacting the waterproof membrane 104, blocks water that may seep out from the surface layer 102, reduces the possibility of water seeping into the first waterproof vapor barrier 105, and reduces the possibility of the first waterproof vapor barrier 105 becoming excessively damp and moldy.

[0037] Reference Figure 4 and Figure 5 In some embodiments, the lower end of the waterproof baffle 109 extends into a sub-plate 110 in a direction away from the surface plate 102. The waterproof baffle 109 and the sub-plate 110 together form an inverted T-shape. The upper end of the sub-plate 110 is fixedly connected to the first waterproof vapor barrier 105, and the lower end of the sub-plate 110 is fixedly connected to the concrete structure 400. The bottom end of the waterproof baffle 109 can be fixedly connected to the concrete structure 400 by bolts.

[0038] The sub-plate 110 increases the path length and difficulty of water vapor penetration, improving waterproof reliability. It blocks water vapor from the concrete structure 400, preventing water from seeping into the concrete structure 400 when the ground is wet, as the surface plate 102 is the floor. The sub-plate 110 provides comprehensive wrapping and blocking of water vapor, further eliminating the possibility of excessive water immersion in the first waterproof vapor barrier 105, reducing the possibility of the waterproof vapor barrier becoming damp, moldy, and oxidized, and improving the reliability of the device.

[0039] Reference Figure 4 and Figure 5 In some embodiments, the cover plate 212 extends to both sides to form extension plates 214, which are located above the surface plate 102. The extension plates 214 expand the coverage area of ​​the cover plate 212 over the seam of the surface plate 102, forming an overlap protection to prevent dust and debris from falling into the expansion joint 103.

[0040] Reference Figure 4 and Figure 5In some embodiments, a second elastic adhesive strip 215 is fixedly disposed between the side end of the extension plate 214 and the side end of the surface plate 102. The second elastic adhesive strip 215 seals the lateral gap between the extension plate 214 and the surface plate 102, forming a complete peripheral sealing system to prevent moisture from seeping in from the side. After the second elastic adhesive strip 215 is attached, the surface plate 102 and the extension plate 214 are sealed, so that a complete sealed ground is formed between the surface plate 102, the extension plate 214, and the cover plate 212, which ensures both sealing and waterproofing without affecting the deformation displacement of the expansion joint 103.

[0041] Reference Figure 5 In some embodiments, a first sliding groove 216 is provided on the first mounting base 211, and a first sliding block 217 is fixedly installed at the bottom end of the cover plate 212. The first sliding block 217 is slidably disposed in the first sliding groove 216. A second sliding block 223 is fixedly installed on the second mounting base 221, and a second sliding groove 224 is provided on the base plate 222. The second sliding block 223 is slidably disposed in the second sliding groove 224.

[0042] The structure of the sliding block embedded in the sliding groove prevents the cover plate 212 or the base plate 222 from detaching from the mounting base under vertical seismic forces or impact loads, thus improving safety. The first slider enables the cover plate 212 to move along the width direction of the expansion joint 103 when it is stepped on or displaced by external forces, reducing the possibility of displacement of the cover plate 212 along the length direction of the expansion joint 103, which could lead to misalignment. Anti-friction materials or coatings can be applied to the sliding contact surface to reduce sliding resistance and ensure that the expansion joint 103 can still expand and contract normally at low temperatures or after long-term static conditions.

[0043] Reference Figure 5 In some embodiments, sealing sections 111 extend from both sides of the waterproof membrane 104. The sealing sections 111 are disposed between the surface plate 102, the extension plate 214 and the waterproof baffle 109. The first mounting base 211 is fixedly connected to the waterproof baffle 109 by means of a fixing bolt 218.

[0044] The sealing section 111 is embedded between the three components of the surface plate 102, the extension plate 214, and the waterproof baffle 109, forming a compression seal and improving the sealing reliability of the edge of the waterproof membrane 104. The fixing bolt 218 simultaneously realizes the mechanical connection between the first mounting base 211 and the waterproof baffle 109 and the compression seal of the sealing section 111, reducing the number of independent sealing elements.

[0045] Reference Figure 6, in some embodiments, a ventilation pipe 301 is connected to the gap 304 between the first waterproof vapor barrier film 105 and the waterproof coiled material 104. The other end of the ventilation pipe 301 is connected to a blower 302. A humidity sensor 303 is arranged in the gap 304. The humidity sensor 303 is electrically connected to the blower 302. The other end of the gap 304 is connected to an air outlet pipe 306, and a check valve 305 is arranged on the air outlet pipe 306.

[0046] When the humidity sensor 303 detects that the humidity in the gap 304 exceeds the set threshold, the blower 302 is automatically started for forced ventilation to actively remove the accumulated water vapor, fundamentally solving the problem of the waterproof vapor barrier film being affected by moisture and mildew. The electrical connection realizes the linkage control of humidity and the blower 302, and the ventilation is only started when necessary, avoiding energy waste caused by continuous operation. The check valve 305 on the air outlet pipe 306 prevents the backflow of external humid air, ensuring the ventilation and dehumidification effect and maintaining a dry microenvironment in the gap 304. The active dehumidification mechanism greatly prolongs the service life of the waterproof vapor barrier film, reduces the maintenance frequency, and ensures the long-term overall airtightness of the building. The continuously monitored data of the humidity sensor 303 can be used to evaluate the operation state of the system, realize predictive maintenance, and timely discover potential hidden dangers of seal failure.

[0047] The implementation principle of an airtight structure device for indoor floor expansion joints in a nearly zero-energy building in this invention example is as follows: Both ends of the waterproof baffle 109 are arranged at an angle to form a diversion slope surface, which can direct the cleaning water on the ground away from the expansion joint 103. At the same time, as a lateral enclosure structure, it reduces the direct contact of water vapor with the waterproof coiled material 104, and can also block the water that may leak out from the surface panel 102, reducing the probability of water infiltration into the first waterproof vapor barrier film 105 and excessive moisture and mildew of the vapor barrier film; the active dehumidification mechanism greatly prolongs the service life of the waterproof vapor barrier film, reduces the maintenance frequency, and ensures the long-term overall airtightness of the building. The humidity sensor 303 in the system can continuously monitor data to evaluate the operation state, realize predictive maintenance, and timely discover potential hidden dangers of seal failure.

[0048] The above are all preferred embodiments of the present invention, and the protection scope of the present invention is not limited accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present invention should be covered within the protection scope of the present invention.

Claims

1. A near-zero energy building indoor floor expansion joint airtight structural device, characterized in that, include: Insulation board (101) is fixedly installed in the expansion joint (103) of concrete; The surface panel (102) is fixedly installed on the upper concrete structure (400) of the expansion joint (103); The waterproof membrane (104) is fixedly connected to the side of the surface plate (102) at both ends, and has a metal film attached to its surface; The support mechanism (200) includes an upper support assembly (210) and a lower support assembly (220). The upper support assembly (210) includes a first mounting seat (211) and a cover plate (212). The two first mounting seats (211) are respectively fixedly installed at both ends of the waterproof membrane (104). The cover plate (212) is slidably disposed between the two first mounting seats (211). The lower support assembly (220) is fixedly installed in the expansion joint (103) below the insulation board (101). The first waterproof vapor barrier membrane (105) is fixedly installed on both sides between the waterproof membrane (104) and the concrete structure (400), and the middle section is set in an arc shape; Weather-resistant adhesive (107) is injected into the gap between the surface layer (102) and the waterproof membrane (104); The fire-resistant strip (108) is fixedly installed on the lower support assembly (220), with one end abutting against the bottom end of the insulation board (101); The second waterproof vapor barrier membrane (106) is fixedly installed on both sides on the lower support assembly (220), and the middle section is arc-shaped.

2. The airtight structural device for indoor floor expansion joints in near-zero energy buildings according to claim 1, characterized in that: The lower support assembly (220) includes a second mounting base (221) and a base plate (222). Two second mounting bases (221) are fixedly mounted on the concrete structure (400) at both ends of the expansion joint (103). The upper end of the base plate (222) is slidably mounted on the second mounting bases (221). The fire-resistant strip (108) is fixedly mounted on the top of the second mounting bases (221).

3. The airtight structural device for indoor floor expansion joints in near-zero energy buildings according to claim 2, characterized in that: A first elastic strip (213) is fixedly installed between the two sides of the cover plate (212) and the first mounting base (211).

4. The airtight structural device for indoor floor expansion joints in near-zero energy buildings according to claim 2, characterized in that: A waterproof baffle (109) is fixedly installed on the surface plate (102). The two ends of the waterproof baffle (109) are set at a certain angle. The upper end of the waterproof baffle (109) is fixedly connected to the side of the surface plate (102). The first mounting base (211) is fixedly connected to the waterproof baffle (109). The lower end of the waterproof baffle (109) is fixedly installed on the bottom end of the surface plate (102).

5. The airtight structural device for indoor floor expansion joints in near-zero energy buildings according to claim 4, characterized in that: The lower end of the waterproof baffle (109) extends into a sub-plate (110) away from the surface plate (102). The upper end of the sub-plate (110) is fixedly connected to the first waterproof vapor barrier membrane (105), and the lower end of the sub-plate (110) is fixedly connected to the concrete structure (400).

6. The airtight structural device for indoor floor expansion joints in near-zero energy buildings according to claim 5, characterized in that: The cover plate (212) extends into extension plates (214) on both sides, and the extension plates (214) are located above the surface plate (102).

7. The airtight structural device for indoor floor expansion joints in near-zero energy buildings according to claim 6, characterized in that: A second elastic strip (215) is fixedly provided between the side end of the extension plate (214) and the side end of the surface plate (102).

8. The airtight structural device for indoor floor expansion joints in near-zero energy buildings according to any one of claims 2-7, characterized in that: The first mounting base (211) is provided with a first sliding groove (216), and the bottom end of the cover plate (212) is fixedly installed with a first sliding block (217), which slides within the first sliding groove (216); the second mounting base (221) is fixedly installed with a second sliding block (223), and the bottom plate (222) is provided with a second sliding groove (224), which slides within the second sliding groove (224).

9. The airtight structural device for indoor floor expansion joints in near-zero energy buildings according to claim 6, characterized in that: The waterproof membrane (104) also has sealing sections (111) extending from both sides. The sealing sections (111) are disposed between the surface plate (102), the extension plate (214) and the waterproof baffle (109). The first mounting base (211) is fixedly connected to the waterproof baffle (109) by means of a fixing bolt (218).

10. The airtight structural device for indoor floor expansion joints in near-zero energy buildings according to claim 1, characterized in that: A ventilation pipe (301) is connected to the gap (304) between the first waterproof vapor barrier membrane (105) and the waterproof roll material (104). A fan (302) is connected to the other end of the ventilation pipe (301). A humidity sensor (303) is installed in the gap (304). The humidity sensor (303) is electrically connected to the fan (302). An air outlet pipe (306) is connected to the other end of the gap (304). A one-way valve (305) is installed on the air outlet pipe (306).

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