Underground pre-buried air duct hoistway structure

Abstract

The utility model relates to the technical field of underground shaft structure engineering, in particular to a pre-embedded air pipe shaft structure which comprises an air pipe located under the ground and a pipe well system surrounding the air pipe. One end of the air pipe is connected with an outdoor air conditioner outdoor unit, the other end of the air pipe is connected with a pipe well connector located under the indoor ground, and the pipe well system sequentially comprises a heat preservation layer, a waterproof layer and a structure supporting layer from inside to outside. For small and medium-sized buildings, according to the air pipe shaft structure, the air pipe is pre-buried underground, so that the risk that the air pipe is influenced by the external environment is effectively reduced, direct contact of wind, rain, sunlight and external force is avoided, and the service life of a system is prolonged. Meanwhile, the waterproof problem in the underground environment is solved through the waterproof layer, heat loss is reduced through the design of the heat preservation layer, and the operation efficiency of the air conditioning system is improved. Due to the design of the structural supporting layer, the bearing capacity is improved, the mounting process is simplified, and the construction complexity and cost are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of underground shaft construction, in particular to an underground pre-buried air duct shaft construction. Background Art

[0002] In HVAC systems, the air duct connection between the outdoor air conditioner unit and the indoor manhole is a critical link in achieving indoor air circulation and temperature regulation. Traditionally, air ducts are typically laid outdoors, such as along building walls or on the ground around the building. However, these exposed ducts not only reduce building space but are also susceptible to environmental damage. This is particularly true in small and medium-sized buildings, where space is relatively compact. Exposed ducts can appear obtrusive and detract from the visual quality of the building's facade.

[0003] Furthermore, exposed ducts are susceptible to corrosion and damage from environmental factors such as rainwater erosion, UV radiation, and human damage, which reduces the lifespan of the duct system and increases maintenance and replacement costs. For small and medium-sized buildings, balancing building space utilization with system efficiency is particularly important. Efficient space utilization and cost control are also key design challenges. Utility Model Content

[0004] (1) Technical issues to be solved

[0005] The utility model provides an underground pre-buried air duct shaft structure, which aims to solve the problem of high space occupancy of air-conditioning systems in small and medium-sized buildings. If the pre-buried air duct method is adopted, the problems of water seepage, heat dissipation and structural support construction difficulties faced by the air duct can be solved.

[0006] (2) Technical solution

[0007] To achieve the above objectives, the present invention proposes an underground pre-buried air duct shaft structure, comprising an air duct located below ground level, a first pipe shaft system surrounding the horizontal section of the air duct, and a second pipe shaft system surrounding the vertical section of the air duct. One end of the air duct is connected to an outdoor air conditioner unit, and the other end is connected to a pipe shaft interface located below ground level indoors. The first pipe shaft system comprises, from the inside out, a first insulation layer, a first waterproof layer, and a first structural support layer. The second pipe shaft system comprises, from the inside out, a second insulation layer, a second waterproof layer, and a second structural support layer.

[0008] The first structural support layer is a shaft structure formed by a reinforced concrete top plate, a reinforced concrete bottom plate, a first masonry and a second masonry, and the second structural support layer is a shaft structure formed by a third masonry surrounding each other.

[0009] A further technical solution is that the first masonry and the second masonry are built above the reinforced concrete bottom plate, the top of the first masonry is provided with a first tongue and groove, the top of the second masonry is provided with a second tongue and groove, the first tongue and groove are arranged opposite to the second tongue and groove, and a plurality of the horizontally arranged reinforced concrete top plates are overlapped therebetween;

[0010] The width of the first tongue and groove is half of the width of the first masonry, and the width of the second tongue and groove is half of the width of the second masonry.

[0011] A further technical solution is that a concrete cushion layer is laid between the first structural support layer and the soil.

[0012] A further technical solution is to provide a waterproof mortar surface layer on the outer sides of the first masonry, the second masonry and the third masonry, and a fine stone concrete surface layer on the inner sides.

[0013] A further technical solution is that the fine stone concrete surface layer is provided on the inner side of the reinforced concrete top plate and a double-layer bidirectional steel mesh is provided inside. The fine stone concrete surface layer is provided on the inner side of the reinforced concrete bottom plate and a double-layer bidirectional steel mesh is provided inside.

[0014] A further technical solution is that the first waterproof layer is evenly applied and bonded to the inner side of the fine stone concrete surface layer of the first structural support layer; the second waterproof layer is evenly applied and bonded to the inner side of the fine stone concrete surface layer of the second structural support layer.

[0015] A further technical solution is that the first waterproof layer and the second waterproof layer are self-adhesive polyester-based modified asphalt waterproof membranes.

[0016] A further technical solution is that the air duct is a stainless steel tube with a rectangular cross section, and a filter device is provided at the interface between the air duct and the indoor pipe well.

[0017] (3) Beneficial effects

[0018] The beneficial effects of the utility model are:

[0019] The present utility model proposes a pre-buried air duct shaft structure, which is specifically designed for the underground pre-buried treatment of the air duct portion connecting the air conditioner outdoor unit and the indoor pipe shaft in the air-conditioning system of small and medium-sized buildings. By pre-burying the air duct in the underground area around the building, the risk of the air duct being affected by the external environment is effectively reduced, and direct contact with wind, rain, sunlight and external forces is avoided, thereby extending the service life of the system. This structural layout can achieve efficient operation of the air-conditioning system in a limited space, improve the efficiency of the use of building space, while reducing maintenance costs and enhancing the safety and durability of the building system. In addition, the waterproof layer design solves the waterproofing problem in the underground environment, and the insulation layer design reduces heat loss and improves the operating efficiency of the air-conditioning system. The design of the structural support layer improves the load-bearing capacity, simplifies installation, and reduces costs and construction complexity. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is the overall construction diagram of the underground pre-buried air duct shaft structure;

[0021] Figure 2 This is a schematic diagram of the cross-sectional structure of the horizontal section of the underground pre-buried air duct;

[0022] Figure 3 It is a schematic diagram of the three-dimensional structure of the horizontal section of the underground pre-buried air duct;

[0023] Figure 4 This is a schematic diagram of the cross-sectional structure of the vertical section of the underground pre-buried air duct.

[0024] [Description of Reference Numerals]

[0025] 1: Air duct; 2: First pipe shaft system; 21: First structural support layer; 211: Reinforced concrete top slab; 212: Reinforced concrete bottom slab; 213: First masonry; 2131: First tongue and groove; 214: Second masonry; 2141: Second tongue and groove; 22: First insulation layer; 23: First waterproof layer; 3: Second pipe shaft system; 31: Second structural support layer; 311: Third masonry; 32: Second insulation layer; 33: Second waterproof layer; 4: Fine stone concrete surface layer; 5: Concrete cushion layer; 6: Soil; 7: Air conditioner outdoor unit; 8: Pipe shaft interface. DETAILED DESCRIPTION

[0026] In order to better explain the present invention and facilitate understanding, the present invention is described in detail below through specific implementation methods in conjunction with the accompanying drawings.

[0027] This embodiment provides an underground pre-buried air duct shaft structure, such as Figure 1As shown, it includes an air duct 1 located below ground, a first pipe well system 2 surrounding the horizontal section of the air duct 1, and a second pipe well system 3 surrounding the vertical section of the air duct 1. (For clarification, the air duct 1 is a rectangular stainless steel pipe, and the middle portions of the first pipe well system 2 and the second pipe well system 3 have rectangular pipe well passages that can just pass through the air duct 1.) One end of the air duct 1 is connected to an outdoor air conditioner unit 7, and the other end is connected to a pipe well interface 8 located below ground indoors. The first pipe well system 2 includes, from the inside out, a first insulation layer 22, a first waterproof layer 23, and a first structural support layer 21. The second pipe well system 3 includes, from the inside out, a second insulation layer 32, a second waterproof layer 33, and a second structural support layer 31.

[0028] Specifically, the first structural support layer 21 is a shaft structure formed by a reinforced concrete top plate 211, a reinforced concrete bottom plate 212, a first masonry 213 and a second masonry 214, and the second structural support layer 31 is a shaft structure formed by a third masonry 311 surrounding each other.

[0029] It should be noted that masonry refers to a building structure constructed from materials such as bricks and stones and mortar. Mortar, a mixture of cement and fine sand, is used to fill the gaps between bricks and enhance the stability of the overall structure. In this embodiment, the first masonry 213, the second masonry 214, and the third masonry 311 are all planar wall structures constructed from bricks and mortar.

[0030] The above-mentioned pre-buried air duct shaft structure, by pre-burying the air duct 1 in the underground area around the building, effectively reduces the risk of the air duct 1 being affected by the external environment, avoids direct contact with wind, rain, sunlight, and external forces, and extends the service life of the system. It can achieve efficient operation of the air conditioning system in a limited space, improve the efficiency of building space utilization, while reducing maintenance costs and enhancing the safety and durability of the building system. In addition, the waterproof layer solves the waterproofing problem in the underground environment, and the insulation layer reduces heat loss, improving the operating efficiency of the air conditioning system. The structural support layer strengthens the structural protection function of the air duct 1.

[0031] Specifically, a first masonry unit 213 and a second masonry unit 214 are built above the reinforced concrete base plate 212. A first tongue-and-groove 2131 is provided on the top of the first masonry unit 213, and a second tongue-and-groove 2141 is provided on the top of the second masonry unit 214. The first tongue-and-groove 2131 and the second tongue-and-groove 2141 are arranged opposite each other, and a plurality of horizontally arranged reinforced concrete top plates 2511 are overlapped therebetween. The width of the first tongue-and-groove 2131 is half the width of the first masonry unit 213, and the width of the second tongue-and-groove 2141 is half the width of the second masonry unit 214. The width here specifically refers to the dimension along the arrangement of the first masonry unit 213 and the second masonry unit 214. This installation method achieves lower costs while achieving a greater load-bearing capacity.

[0032] In this embodiment, a concrete cushion layer 5 is laid between the first structural support layer 251 and the soil 6. A waterproof mortar surface layer is provided on the exterior of the first, second, and third masonry units 213, 214, and 311, while a fine stone concrete surface layer 4 is provided on the interior. The waterproof mortar surface layer enhances waterproofing and protects the first, second, and third masonry units 213, 214, and 311. The fine stone concrete surface layer 4 enhances the integrity of the first, second, and third masonry units 213, 214, and 311, making the structure more secure and reliable.

[0033] It should be noted here that the above-mentioned “outer side” refers to the side away from the air duct 1 , and the “inner side” refers to the side close to the air duct 1 .

[0034] In this embodiment, a fine-grained concrete surface layer 4 is provided on the inner side of the reinforced concrete top plate 2511, and a double-layer, bidirectional steel mesh is installed inside. A fine-grained concrete surface layer 4 is provided on the inner side of the reinforced concrete bottom plate 212, and a double-layer, bidirectional steel mesh is installed inside. Double-layer bidirectional reinforcement refers to the placement of steel bars in both the horizontal and vertical directions of the bottom and top bars, forming a two-layer steel mesh arrangement. This structure can withstand the pressure of the upper soil layer 6 without compressing the air duct 1, effectively protecting the air duct 1 and preventing structural deformation and fracture.

[0035] In this embodiment, the first waterproof layer is evenly applied and bonded to the inner side of the fine-stone concrete surface layer of the first structural support layer; the second waterproof layer is evenly applied and bonded to the inner side of the fine-stone concrete surface layer of the second structural support layer. Both the first and second waterproof layers in this embodiment are self-adhesive polyester-reinforced modified asphalt waterproof membranes. The waterproof layers primarily prevent soil moisture from penetrating into the insulation layer, which could reduce the insulation layer's service life and increase subsequent maintenance costs.

[0036] In this embodiment, the air duct 1 is a stainless steel pipe, and a filtering device can be set at the connection with the indoor pipe well interface 8 to increase the purity of the air and create a better and healthier indoor environment.

[0037] The specific construction steps of the underground pre-buried air duct shaft structure proposed in the above embodiment, wherein the horizontal section below the ground is as follows:

[0038] First, dig an open trench that meets the design dimensions at the corresponding position of the embedded air duct 1, and tamp the bottom soil to a density of more than 90%. Lay an 80mm thick C15 concrete cushion layer 5 on top, and cast a 120mm thick reinforced concrete base plate 212 on the concrete cushion layer 5, and lay a double-layer bidirectional 8mm diameter and 150mm spacing steel mesh 50mm below the surface. Build the first masonry 213 and the second masonry 214 with a thickness of 240mm from bottom to top on both sides of the trench, and build the first tongue and groove 2131 and the second tongue and groove 2141 with a width and height of 120mm at the top. The outside of the first masonry 213 and the second masonry 214 are plastered with waterproof mortar, and the inside of the first masonry 213 and the second masonry 214 and the reinforced concrete base plate 212 are leveled with 50mm thick, P8 anti-seepage grade fine stone concrete. Afterwards, lay a 2mm thick self-adhesive polyester-based modified asphalt waterproof membrane on the upper surface of the reinforced concrete base plate 212. Next, 30mm-thick insulation boards were placed at the bottom and sides of the trench. A 1.4mm-thick 304 stainless steel finished air duct 1 was then placed, and one end of the duct 1 was connected to the manhole interface 10. A 30mm-thick insulation layer 4 was then placed on top of the duct 1. The waterproof membrane on both sides was overlapped to cover the insulation layer 4, forming a fully enclosed, integrated first waterproof layer 23. This layer was then leveled with 50mm-thick, P8 impermeability grade fine stone concrete. A 120mm-thick reinforced concrete top slab 2511 (double-layer, bidirectional Φ8@150 mm) was then laid. Finally, the trench sides and top were backfilled with plain soil and compacted.

[0039] It should be noted that all directional indications in this embodiment (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0040] In addition, the descriptions of "first," "second," and so on in this embodiment are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the technical features indicated. Therefore, features defined as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of this embodiment, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0041] In this embodiment, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this embodiment based on specific circumstances.

[0042] It should be understood that the above description of the specific embodiments of the present invention is merely for the purpose of illustrating the technical approach and features of the present invention. Its purpose is to enable those skilled in the art to understand the contents of the present invention and implement them accordingly. However, the present invention is not limited to the above-described specific embodiments. Any changes or modifications made within the scope of the claims of the present invention shall be included within the scope of protection of the present invention.

Claims

1. An underground pre-buried air duct shaft structure, characterized in that: It comprises an air duct (1) located below the ground, a first pipe well system (2) surrounding the horizontal section of the air duct (1), and a second pipe well system (3) surrounding the vertical section of the air duct (1); One end of the air duct (1) is connected to an outdoor air conditioner (7), and the other end is connected to a pipe well interface (8) located below the indoor floor. The first pipe well system (2) includes, from the inside to the outside, a first thermal insulation layer (22), a first waterproof layer (23), and a first structural support layer (21). The second pipe well system (3) includes, from the inside to the outside, a second thermal insulation layer (32), a second waterproof layer (33), and a second structural support layer (31). The first structural support layer (21) is a shaft structure formed by a reinforced concrete top plate (211), a reinforced concrete bottom plate (212), a first masonry (213) and a second masonry (214), and the second structural support layer (31) is a shaft structure formed by a third masonry (311).

2. The underground pre-buried air duct shaft structure according to claim 1, characterized in that: The first masonry (213) and the second masonry (214) are built above the reinforced concrete bottom plate (212); the top of the first masonry (213) is provided with a first tongue and groove (2131); the top of the second masonry (214) is provided with a second tongue and groove (2141); the first tongue and groove (2131) and the second tongue and groove (2141) are arranged opposite to each other and a plurality of the reinforced concrete top plates (211) arranged horizontally are overlapped therebetween; The width of the first tongue and groove (2131) is half the width of the first masonry (213), and the width of the second tongue and groove (2141) is half the width of the second masonry (214).

3. The underground pre-buried air duct shaft structure according to claim 1, characterized in that: A concrete cushion layer (5) is also laid between the first structural support layer (21) and the soil (6).

4. The underground pre-buried air duct shaft structure according to claim 1, characterized in that: The outer sides of the first masonry (213), the second masonry (214) and the third masonry (311) are coated with a waterproof mortar surface layer, and the inner sides are coated with a fine stone concrete surface layer (4).

5. The underground pre-buried air duct shaft structure according to claim 4, characterized in that: The fine stone concrete surface layer (4) is arranged on the inner side of the reinforced concrete top plate (211) and a double-layer bidirectional steel mesh is arranged inside; The fine stone concrete surface layer (4) is arranged on the inner side of the reinforced concrete bottom plate (212), and a double-layer bidirectional steel mesh is arranged inside.

6. The underground pre-buried air duct shaft structure according to claim 4 or 5, characterized in that: The first waterproof layer (23) is evenly applied and bonded to the inner side of the fine stone concrete surface layer (4) of the first structural support layer (21); and the second waterproof layer (33) is evenly applied and bonded to the inner side of the fine stone concrete surface layer (4) of the second structural support layer (31).

7. The underground pre-buried air duct shaft structure according to claim 1, characterized in that: The first waterproof layer (23) and the second waterproof layer (33) are self-adhesive polyester-based modified asphalt waterproof membranes.

8. The underground pre-buried air duct shaft structure according to claim 1, characterized in that: The air duct (1) is a stainless steel tube with a rectangular cross section. A filtering device is provided at the connection between the air duct (1) and the indoor pipe well interface (8).

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