An assembled concrete track roof air duct structure for a subway station
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- POWERCHINA RAILWAY CONSTR
- Filing Date
- 2025-07-23
- Publication Date
- 2026-07-21
AI Technical Summary
Traditional cast-in-place concrete construction methods result in long construction cycles, difficult quality control, serious resource waste, and severe environmental pollution in subway station track top ventilation ducts.
The prefabricated concrete structure is adopted, which is prefabricated in the factory and assembled on site. The bottom plate and side plate of the prefabricated rail top ventilation duct are connected to the cast-in-place structure with anchor bolts to ensure the accuracy and stability of the structure.
It shortens the construction period, improves construction efficiency and quality control, reduces resource consumption and environmental pollution, enhances structural stability and safety, and conforms to the concept of green building.
Smart Images
Figure CN224532149U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of subway station building structure technology, specifically to a prefabricated concrete rail-top ventilation duct structure for subway stations. Background Technology
[0002] In subway station construction, track-top ventilation ducts, as critical ventilation facilities, have a decisive impact on station operational efficiency and passenger comfort due to their design and construction quality. Traditionally, track-top ventilation ducts have primarily employed cast-in-place concrete technology. While this technology demonstrates certain advantages in structural stability, its drawbacks have gradually become limiting factors. Cast-in-place construction requires on-site formwork erection, concrete pouring, and subsequent curing. These processes are not only time-consuming but also complex, extending the overall construction cycle and thus affecting the overall construction progress of the subway station. Furthermore, the quality of on-site poured concrete is affected by various factors, such as weather conditions and the skill level of construction workers, making quality control difficult and hindering the guarantee of uniformity and reliability for each track-top ventilation duct structure. Cast-in-place construction requires a large amount of formwork and support materials, which are often not recyclable after use, resulting in significant resource waste. Finally, the construction waste and noise pollution generated during cast-in-place construction have adverse environmental impacts, increasing the environmental costs of subway station construction.
[0003] With increasing demands for construction efficiency and environmental protection, the industry has begun to seek more efficient, environmentally friendly, and quality-controllable construction methods. Prefabricated concrete structure technology has emerged to address this need. Through factory prefabrication and rapid on-site assembly, it effectively shortens the construction cycle and improves construction efficiency. Because prefabricated components are completed in the factory, quality control is more stringent, ensuring the accuracy and consistency of each component. Furthermore, prefabricated structures reduce reliance on formwork and supports during on-site construction, thereby reducing material consumption and environmental pollution. Therefore, developing a prefabricated concrete structure suitable for subway station track-top ventilation ducts not only solves many drawbacks of traditional cast-in-place construction but also has significant practical implications and application prospects for promoting the greening and industrialization of subway station construction.
[0004] In the context of the rapid development of urban rail transit, the construction efficiency and quality control of subway stations are particularly important. As an indispensable ventilation facility in subway stations, the design and construction methods of track-top ventilation ducts directly affect the station's operational efficiency and passenger comfort. While traditional cast-in-place concrete construction methods offer advantages in structural stability, their long construction cycles, difficulty in quality control, significant resource waste, and environmental pollution make them unsuitable for modern subway station construction. Therefore, developing a new track-top ventilation duct construction technology to improve construction efficiency, ensure construction quality, and reduce resource consumption and environmental pollution has become an urgent need for the industry. Prefabricated concrete structure technology, with its advantages of factory prefabrication, rapid on-site assembly, controllable quality, and reduced on-site construction and environmental pollution, offers a potential solution to these problems, possessing broad application prospects and significant practical importance. Utility Model Content
[0005] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a prefabricated concrete track top ventilation duct structure for subway stations. By prefabricating in the factory and assembling on site, it solves the problems of long construction cycle, difficult quality control, resource waste and environmental pollution of cast-in-place track top ventilation ducts.
[0006] The objective of this utility model is achieved through the following technical solution:
[0007] A prefabricated concrete rail-top ventilation duct structure for subway stations includes a prefabricated rail-top ventilation duct, which includes a bottom plate and side plates, and the bottom plate and side plates are fixed together; the prefabricated rail-top ventilation duct is installed between the cast-in-place floor slab and the cast-in-place side wall of the subway station.
[0008] The base slab is fixed to the cast-in-place side walls, and the side slabs are fixed to the cast-in-place floor slabs. Side wall connecting beams are set on the cast-in-place side walls of the subway station, and floor slab connecting beams are set under the cast-in-place floor slabs of the subway station. Side wall anchors are pre-embedded in the side wall connecting beams, and floor slab anchors are pre-embedded in the floor slab connecting beams.
[0009] Several pre-drilled holes are provided on the base plate and several pre-drilled holes are provided on the side plates. The base plate is placed on the side wall connecting beam, and the side wall anchor bolts pass through the pre-drilled holes in the base plate and are connected to the fixing nuts. Side plates are provided next to the floor connecting beam, and floor anchor bolts pass through the side plates and are connected to the fixing nuts.
[0010] The working principle of this prefabricated concrete track-top ventilation duct structure is as follows: The prefabricated track-top ventilation duct, composed of a base slab and side slabs, is pre-manufactured and undergoes quality control in the factory to ensure the accuracy and quality of the structure. At the subway station construction site, the prefabricated track-top ventilation duct is accurately placed between the cast-in-place floor slab and the cast-in-place side walls. The base slab is fixed to the cast-in-place side walls using pre-embedded side wall anchors, and the side slabs are fixed to the cast-in-place floor slab using pre-embedded floor slab anchors. Specifically, the side wall anchors pre-embedded in the side wall connecting beams pass through pre-drilled holes in the base slab and are tightened with fixing nuts, thus achieving a stable connection between the base slab and the cast-in-place side walls. Similarly, the floor slab anchors pre-embedded in the floor slab connecting beams pass through pre-drilled holes in the side slabs and are tightened with fixing nuts, achieving a stable connection between the side slabs and the cast-in-place floor slab.
[0011] This invention not only simplifies the construction process and improves construction efficiency, but also ensures the stability and safety of the track-top ventilation duct structure. The use of prefabricated components reduces on-site wet work, which is beneficial for controlling construction quality and progress, while also reducing construction waste, aligning with the concept of green building.
[0012] As a preferred method, the side plate is close to the beam of the floor slab connecting beam, and the side plate is positioned by the angle formed by the floor slab connecting beam and the cast-in-place floor slab after the floor slab anchor bolts are connected to the fixing nuts.
[0013] As a preferred method, the end of the base plate is pressed against the cast-in-place side wall.
[0014] As a preferred embodiment, the lower middle part of the base plate and the side plate are fixed, forming a T-shaped structure at the connection between the base plate and the side plate.
[0015] As a preferred embodiment, the number of reserved holes in the bottom plate is the same as the number of reserved holes in the side plate, and the positions of the reserved holes in the bottom plate and the reserved holes in the side plate correspond to each other.
[0016] As a preferred method, the spacing between adjacent sidewall anchors is 300mm and the length of the sidewall anchor is 400mm; the spacing between adjacent floor slab anchors is 300mm and the length of the floor slab anchor is 400mm.
[0017] As a preferred method, the length of the side wall anchor bolts embedded in the side wall connecting beam is 150mm-250mm; the length of the floor slab anchor bolts embedded in the floor slab connecting beam is 150mm-250mm.
[0018] As a preferred method, the pre-drilled holes in the base plate are oblong holes.
[0019] As a preferred method, the gap between the edge of the reserved hole in the base plate and the anchor bolt in the side wall is filled with cement mortar; the gap between the edge of the reserved hole in the side plate and the anchor bolt in the floor slab is filled with cement mortar.
[0020] As a preferred embodiment, an air outlet is provided on the bottom plate of the prefabricated rail-top air duct, and an adjustable ventilation device is provided at the air outlet; the adjustable ventilation device includes a frame, an adjustment handle, a transmission plate, a rotating part, a connecting component, a mounting base, a rotating shaft, and an adjustment plate; the frame has an equal number of mounting bases on both sides, the rotating shaft is rotatably connected to the mounting base, and the adjustment plate is set on the rotating shaft;
[0021] The mounting base includes a handle base and a transmission base. An adjustment handle is provided at the handle base, and the adjustment handle is connected to a rotating shaft mounted on the handle base. A rotating part is provided at the transmission base, and the rotating part is connected to the rotating shaft and also to a transmission plate. A connecting component is provided between the transmission plate and the adjustment handle, with one end of the connecting component rotatably connected to the adjustment handle and the other end rotatably connected to the transmission plate.
[0022] When adjusting the ventilation volume of the air vents, the operator grasps and rotates the adjustment handle, causing the shaft mounted on the handle base to rotate as well. Since the shaft is rotatably connected to the mounting base, and the adjustment plate is mounted on the shaft, the rotation of the shaft causes the adjustment plate to rotate as well, thus changing the relative position between the adjustment plate and the air vent, thereby adjusting the ventilation volume. Simultaneously, the rotating part is connected to the shaft, and also to the transmission plate via a connecting assembly. When the adjustment handle is rotated, the transmission plate, through the transmission action of the connecting assembly, works in conjunction with the rotating part, making the adjustment process of the entire adjustable ventilation device smoother and more reliable. With this structure, the operator can easily adjust the ventilation volume of the air vents by rotating the adjustment handle, achieving accurate control of the ventilation volume of the prefabricated rail-top duct.
[0023] This utility model has at least the following beneficial effects: By adopting prefabricated concrete structure technology, the main components of the track-top ventilation duct are prefabricated in the factory, requiring only on-site assembly, which greatly shortens the construction cycle and improves the overall construction progress of the subway station. Prefabricated components are produced in the factory, allowing for stricter quality control and ensuring the accuracy and consistency of each component, thereby improving the overall quality of the track-top ventilation duct structure. Factory production of prefabricated components reduces construction waste and noise pollution, contributing to environmental protection. Through the connection method of pre-embedded anchor bolts and fixing nuts, the prefabricated track-top ventilation duct is tightly integrated with the cast-in-place floor slab and side walls, enhancing the stability and reliability of the structure and ensuring the safe operation of the subway station. It meets the current requirements of green and industrialized urban rail transit construction, helping to promote the transformation and upgrading of subway station construction methods and improve construction efficiency and quality. Attached Figure Description
[0024] To reveal the technical details of the embodiments of this utility model, the accompanying drawings involved in the embodiments will be briefly described below. It should be emphasized that these drawings only present several embodiments of this utility model and should not be considered as defining the scope of the utility model. For those skilled in the art, other related drawings can still be derived based on these drawings without creative effort.
[0025] Figure 1 This is a schematic diagram of the overall structure of this utility model;
[0026] Figure 2 This is a schematic diagram of the assembly of a prefabricated rail-top ventilation duct;
[0027] Figure 3 This is a top view of the prefabricated rail-top ventilation duct;
[0028] Figure 4 This is a side view of the prefabricated rail-top ventilation duct;
[0029] Figure 5 This is a schematic diagram of the installation structure of an adjustable ventilation device;
[0030] Figure 6 for Figure 5 Enlarged schematic diagram of part A;
[0031] In the diagram, 1-cast-in-place side wall, 2-cast-in-place floor slab, 3-side wall connecting beam, 4-floor slab connecting beam, 5-side wall anchor bolt, 6-floor slab anchor bolt, 7-precast rail top air duct, 8-bottom plate reserved hole, 9-side plate reserved hole, 10-fixing nut, 11-mounting plate, 12-adjusting handle, 13-connecting assembly, 13.1-first connector, 13.2-connecting rod, 13.3-second connector, 14-transmission plate, 15-mounting seat, 16-adjusting plate, 17-rotating shaft, 18-air outlet, 19-rotating part, 20-arc groove, 21-limiting component. Detailed Implementation
[0032] The technical solution of this utility model is described in further detail below with reference to the accompanying drawings, but the scope of protection of this utility model is not limited to the following description.
[0033] In the following description, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. However, it should be understood that the present disclosure is not limited to the specific forms shown herein. Rather, it should be understood to encompass various variations, equivalents, and / or alternatives to the embodiments of the present disclosure. In illustrating the drawings, the same reference numerals will be used to denote similar components.
[0034] In this disclosure, terminology is used to describe specific embodiments and does not constitute a limitation thereof. In this context, the use of the singular form also encompasses the plural form, unless otherwise expressly stated herein. In the course of description, terms such as “comprising” or “having” are intended to indicate the presence of features, quantities, steps, operations, structural components, parts, or combinations thereof, and do not preclude the possibility or addition of one or more other features, quantities, steps, operations, structural components, parts, or combinations thereof.
[0035] It should be clarified that while the following description provides detailed specific information to aid in a comprehensive understanding of the exemplary embodiments, those skilled in the art will recognize that the exemplary embodiments can be implemented even without these specific details. For example, the system may be illustrated using block diagrams to avoid excessive detail that could obscure the clarity of the example. In other cases, to maintain the clarity of the example, unnecessary details of well-known processes, structures, and techniques may be omitted.
[0036] like Figure 1 , Figure 2 As shown, a prefabricated concrete rail-top ventilation duct structure includes a prefabricated rail-top ventilation duct 7, which includes a bottom plate and side plates, and the bottom plate and side plates are fixed. The prefabricated rail-top ventilation duct 7 is set between the cast-in-place floor slab 2 and the cast-in-place side wall 1. The overall structure includes the prefabricated concrete rail-top ventilation duct (i.e., the prefabricated rail-top ventilation duct 7) and the connection node structure. The prefabricated concrete rail-top ventilation duct is manufactured in a factory using industrial production methods and assembled on site.
[0037] The base slab is fixed to the cast-in-place side wall 1, and the side slab is fixed to the cast-in-place floor slab 2. A side wall connecting beam 3 is set on the cast-in-place side wall 1, and a floor slab connecting beam 4 is set under the cast-in-place floor slab 2. Side wall anchor bolts 5 are pre-embedded in the side wall connecting beam 3, and floor slab anchor bolts 6 are pre-embedded in the floor slab connecting beam 4. Connecting beams are set on the side of the side wall of the cast-in-place station main structure and at the bottom of the floor slab, and anchor bolts are pre-embedded in the connecting beams. The precast rail top ventilation duct 7 is connected to the connecting beams through the pre-embedded anchor bolts. After the precast structure is connected to the station main structure, a closed ventilation duct structure can be formed.
[0038] Several pre-drilled holes 8 are provided on the base plate, and several pre-drilled holes 9 are provided on the side plate. The base plate is placed on the side wall connecting beam 3, and the side wall anchor bolts 5 pass through the pre-drilled holes 8 on the base plate and are connected to the fixing nuts 10. A side plate is provided next to the floor connecting beam 4, and the floor anchor bolts 6 pass through the side plate and are connected to the fixing nuts 10.
[0039] This embodiment employs a prefabricated rail-mounted ventilation duct 7, comprising a base slab and side slabs. These base slabs and side slabs are prefabricated and fixed in the factory, significantly reducing on-site wet work, shortening the construction cycle, and improving construction efficiency. Simultaneously, the quality of the prefabricated components is easily controlled, ensuring the overall quality and stability of the structure. Furthermore, the prefabricated rail-mounted ventilation duct 7 is positioned between the cast-in-place floor slab 2 and the cast-in-place side wall 1, and through the fixed connection between the base slab and the cast-in-place side wall 1, and the side slab and the cast-in-place floor slab 2, a tight integration of the prefabricated components and the cast-in-place structure is achieved, enhancing the overall integrity and stability of the structure. This connection method is not only simple and reliable but also effectively resists the effects of external loads such as wind pressure and earthquakes, improving the structural safety performance.
[0040] Furthermore, by setting side wall connecting beams 3 on the cast-in-place side wall 1 and floor slab connecting beams 4 under the cast-in-place floor slab 2, and pre-embedding anchor bolts in the connecting beams, a firm connection between the precast rail-top ventilation duct 7 and the cast-in-place structure is achieved. This connection method not only facilitates construction operations but also effectively transfers loads, improving the structure's load-bearing capacity. The pre-drilled holes 8 on the bottom slab and 9 on the side plates not only facilitate the passage of anchor bolts and the connection of fixing nuts 10 but also allow for adjustment of the hole positions and numbers as needed to accommodate precast rail-top ventilation ducts 7 of different sizes and shapes. In summary, the prefabricated concrete rail-top ventilation duct structure has advantages such as high construction efficiency, controllable quality, structural stability, safety and reliability, and strong adaptability, making it suitable for the construction of rail-top ventilation ducts in underground projects such as subway stations.
[0041] In a preferred embodiment, the side plate is close to the beam of the floor slab connecting beam 4. After the floor slab anchor bolts 6 are connected to the fixing nuts 10, the side plate is positioned by the angle formed by the floor slab connecting beam 4 and the cast-in-place floor slab 2. This connection method enhances the stability of the side plate, ensures its positional accuracy during the floor slab pouring process, and improves the overall structural integrity.
[0042] In a preferred embodiment, the end of the base plate abuts against the cast-in-place side wall 1. The close contact between the base plate and the cast-in-place side wall 1 enhances the integrity and sealing of the structure.
[0043] In a preferred embodiment, the lower middle parts of the base plate and side plates are fixed, forming a T-shaped structure at the connection between the base plate and the side plates. The formation of the T-shaped structure improves the strength and stability of the connection and enhances the load-bearing capacity of the entire structure.
[0044] In a preferred embodiment, the number of pre-drilled holes 8 in the bottom plate and the number of pre-drilled holes 9 in the side plate are the same, and the positions of the pre-drilled holes 8 in the bottom plate and the pre-drilled holes 9 in the side plate correspond to each other. See details below. Figure 3 and Figure 4The consistency and correspondence of the pre-drilled holes ensure accurate installation of connectors (such as anchor bolts), simplifying the installation process and improving installation efficiency. In a preferred embodiment, the spacing between adjacent sidewall anchor bolts 5 is 300mm, and the length of the sidewall anchor bolt 5 is 400mm; the spacing between adjacent floor slab anchor bolts 6 is 300mm, and the length of the floor slab anchor bolt 6 is 400mm. The anchor bolts are high-strength bolts, pre-embedded in the main structure of the station. The reasonable anchor bolt spacing and length design ensures the connection strength between the precast rail top ventilation duct 7 and the main structure, ensuring the stability and load-bearing capacity of the structure. Purchasing mass-produced anchor bolts (bolts) is sufficient, simultaneously meeting the requirements of construction convenience and economy.
[0045] In a preferred embodiment, the length of the side wall anchor 5 embedded in the side wall connecting beam 3 is 150mm-250mm; the length of the floor slab anchor 6 embedded in the floor slab connecting beam 4 is 150mm-250mm. This reasonable control of the embedded length ensures the anchor's firmness in the connecting beam, improving the overall structural stability and durability.
[0046] In a preferred embodiment, the pre-drilled hole 8 on the base plate is an oblong hole, which provides greater adjustment space, facilitates fine-tuning during installation, and improves the flexibility and accuracy of installation.
[0047] In a preferred embodiment, the gap between the edge of the pre-drilled hole 8 in the base plate and the side wall anchor bolt 5 is filled with cement mortar; the gap between the edge of the pre-drilled hole 9 in the side plate and the floor slab anchor bolt 6 is also filled with cement mortar. The filling with cement mortar enhances the sealing and strength of the joints, prevents the penetration of moisture and gas, and improves the durability of the structure. During the factory prefabrication of the precast concrete rail-top ventilation duct, pre-drilled connection holes are provided in the precast components. After on-site assembly, cement mortar is injected into the connection holes to fill the joint gaps, enhancing the overall integrity and airtightness of the structure.
[0048] In a preferred embodiment, an air vent 18 is provided on the bottom plate of the prefabricated rail-top air duct 7, and an adjustable ventilation device is provided at the air vent 18. The adjustable ventilation device includes a frame, an adjusting handle 12, a transmission plate 14, a rotating part 19, a connecting assembly 13, a mounting base 15, a rotating shaft 17, and an adjusting plate 16. A mounting plate 11 is provided on the frame, and the mounting plate 11 can be connected to the bottom plate of the prefabricated rail-top air duct 7. An equal number of mounting bases 15 are provided on both sides of the frame, and the rotating shaft 17 is rotatably connected to the mounting base 15. The adjusting plate 16 is provided on the rotating shaft 17. The adjustable ventilation device realizes accurate adjustment of air volume, improves ventilation efficiency, and meets the ventilation needs in different environments.
[0049] Mounting base 15 includes a handle base and a transmission base. An adjusting handle 12 is correspondingly provided on the handle base, and the adjusting handle 12 is connected to a rotating shaft 17 mounted on the handle base. A rotating part 19 is provided on the transmission base, connected to the rotating shaft 17 and also connected to a transmission plate 14. A connecting assembly 13 is provided between the transmission plate 14 and the adjusting handle 12, with one end of the connecting assembly 13 rotatably connected to the adjusting handle 12 and the other end rotatably connected to the transmission plate 14. Mounting base 15 and connecting assembly 13 ensure that the adjusting handle 12 can smoothly drive the transmission plate 14 and the rotating shaft 17 to rotate, achieving precise adjustment of the ventilation volume and improving the reliability and durability of the equipment.
[0050] In one embodiment, three transmission housings are provided, each housing a bearing. A rotating shaft 17 is fixed to the inner ring of the bearing, and a portion of the rotating shaft 17 extends out and connects to a rotating part 19. The rotating part 19 is fixed to the transmission plate 14. Figure 5 and Figure 6 As shown, the connecting assembly 13 includes a first connector 13.1, a connecting rod 13.2, and a second connector 13.3. The connecting rod 13.2 is threadedly connected to both the first connector 13.1 and the second connector 13.3. The connecting rod 13.2 adopts a double-threaded structure. The thread arrangement of the connecting assembly 13 is designed to ensure that when the connecting rod 13.2 rotates in one direction, the first connector 13.1 and the second connector 13.3 move closer to each other, and when the connecting rod 13.2 rotates in another direction, the first connector 13.1 and the second connector 13.3 move further apart. The first connector 13.1 is rotatably connected to the adjusting handle 12, and the first connector 13.3 is rotatably connected to the transmission plate 14 (the transmission plate 14 closest to the adjusting handle 12). The first and second transmission plates 14 each have one first connector 13.1 and one connector 13.3, while the last transmission plate 14 has only one connector 13.3. The first connector 13.1 and the second connector 13.3 are both rotatably connected to the transmission plate 14. It should be noted that the overall length of the connecting assembly 13 should be sufficient to ensure that the adjusting plate 16 can block the air vent 18 when the adjusting handle 12 is in one of its extreme positions.
[0051] In one embodiment, the adjusting handle 12 is provided with an arc-shaped groove 20, and a limiting member 21 is provided on the side wall of the frame. When the adjusting handle 12 rotates, the limiting member 21 is always located within the arc-shaped groove 20. When the limiting member 21 contacts one end of the arc-shaped groove 20, the adjusting handle 12 reaches its limit position (there are two limit positions, left and right). After the adjusting handle 12 is adjusted to the correct position, it can be fixed to the limiting member 21 by a nut (the limiting member 21 is a screw, and the nut is threadedly connected to the screw), which serves to lock or limit the adjusting handle 12.
[0052] In one embodiment, a fan is mounted at the bottom of the adjustable ventilation device to aid ventilation. The fan can be connected to a mounting plate 11 on the frame.
[0053] In one embodiment, the construction steps are as follows:
[0054] 1. A side wall connecting beam 3 is set on the side of the cast-in-place station main body side wall (cast-in-place side wall 1), and a floor slab connecting beam 4 is set at the bottom of the cast-in-place floor slab 2 of the station main body.
[0055] 2. Pre-embed side wall anchors 5 in the side wall connecting beam 3, and pre-embed floor slab anchors 6 in the floor slab connecting beam 4;
[0056] 3. Precast concrete rail top ventilation duct (precast rail top ventilation duct 7) in the factory, with reserved holes 8 in the bottom plate of the precast rail top ventilation duct 7 and reserved holes 9 in the side plate of the precast rail top ventilation duct 7.
[0057] 4. Transport the prefabricated rail-mounted ventilation duct 7 to the construction site and then use hoisting equipment to transport it to the designed location;
[0058] 5. The precast rail top ventilation duct 77 is connected to the side wall connecting beam 3 through the side wall anchor bolt 5, and the precast rail top ventilation duct 7 is connected to the floor slab connecting beam 4 through the floor slab anchor bolt 6;
[0059] 6. Inject cement mortar through the pre-drilled holes 8 in the base plate and 9 in the side plate to fill the joint gaps;
[0060] 7. Install the fixing nuts 10 of the precast rail top ventilation duct 7 floor slab anchor bolts 6; this step can also be to install the fixing nuts 10 of the precast rail top ventilation duct 7 side wall anchor bolts 5, which can be installed from the opening of each section of the precast rail top ventilation duct 7. However, in some special places, the fixing nuts 10 of the side wall anchor bolts 5 are not easy to install. In these places, the fixing nuts 10 can be omitted and cement mortar can be used for fixing only.
[0061] 8. Check the sealing performance and structural stability of the prefabricated structure after installation to ensure construction quality.
[0062] This utility model adopts factory prefabrication and on-site assembly, which has a short construction cycle and high efficiency; the quality of prefabricated components can be controlled, reducing on-site construction errors; the pre-embedded anchor bolt connection ensures structural stability and strong load-bearing capacity; it is environmentally friendly and energy-saving, reducing construction waste and noise pollution.
[0063] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the present invention. The above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. It should be noted that any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.
Claims
1. A prefabricated concrete track-top ventilation duct structure for subway stations, characterized in that: It includes a precast rail top ventilation duct, which consists of a bottom slab and side slabs, and the bottom slab and side slabs are fixed together; the precast rail top ventilation duct is installed between the cast-in-place floor slab and the cast-in-place side wall of the subway station. The base slab is fixed to the cast-in-place side walls, and the side slabs are fixed to the cast-in-place floor slabs. Side wall connecting beams are set on the cast-in-place side walls of the subway station, and floor slab connecting beams are set under the cast-in-place floor slabs of the subway station. Side wall anchors are pre-embedded in the side wall connecting beams, and floor slab anchors are pre-embedded in the floor slab connecting beams. Several pre-drilled holes are provided on the base plate and several pre-drilled holes are provided on the side plates. The base plate is placed on the side wall connecting beam, and the side wall anchor bolts pass through the pre-drilled holes in the base plate and are connected to the fixing nuts. Side plates are provided next to the floor connecting beam, and floor anchor bolts pass through the side plates and are connected to the fixing nuts.
2. The prefabricated concrete rail-top ventilation duct structure for subway stations according to claim 1, characterized in that: The side plate is close to the beam connecting the floor slab. After the floor slab anchor bolts and fixing nuts are connected, the side plate is positioned by the angle formed by the floor slab connecting beam and the cast-in-place floor slab.
3. The prefabricated concrete rail-top ventilation duct structure for subway stations according to claim 1, characterized in that: The end of the base plate is pressed against the cast-in-place side wall.
4. A prefabricated concrete rail-top ventilation duct structure for subway stations according to claim 1, characterized in that: The lower middle part of the base plate and side plates are fixed, forming a T-shaped structure at the connection between the base plate and the side plates.
5. A prefabricated concrete rail-top ventilation duct structure for subway stations according to claim 1, characterized in that: The number of reserved holes in the bottom plate is the same as the number of reserved holes in the side plate, and the positions of the reserved holes in the bottom plate and the reserved holes in the side plate correspond to each other.
6. A prefabricated concrete rail-top ventilation duct structure for subway stations according to claim 1 or 5, characterized in that: The spacing between adjacent sidewall anchors is 300mm, and the length of the sidewall anchor is 400mm; the spacing between adjacent floor slab anchors is 300mm, and the length of the floor slab anchor is 400mm.
7. A prefabricated concrete rail-top ventilation duct structure for subway stations according to claim 6, characterized in that: The length of the side wall anchor bolts embedded in the side wall connecting beams is 150mm-250mm; the length of the floor slab anchor bolts embedded in the floor slab connecting beams is 150mm-250mm.
8. A prefabricated concrete rail-top ventilation duct structure for subway stations according to claim 1, characterized in that: The pre-drilled holes in the base plate are oblong.
9. A prefabricated concrete rail-top ventilation duct structure for subway stations according to claim 1 or 8, characterized in that: The gap between the edge of the pre-drilled hole in the base plate and the anchor bolt in the side wall is filled with cement mortar; the gap between the edge of the pre-drilled hole in the side plate and the anchor bolt in the floor slab is filled with cement mortar.
10. A prefabricated concrete rail-top ventilation duct structure for subway stations according to claim 1, characterized in that: The base plate of the prefabricated rail-top air duct is equipped with an air outlet, and an adjustable ventilation device is installed at the air outlet. The adjustable ventilation device includes a frame, an adjustment handle, a transmission plate, a rotating part, a connecting component, a mounting base, a rotating shaft, and an adjustment plate. The frame has an equal number of mounting bases on both sides, the rotating shaft is rotatably connected to the mounting base, and the adjustment plate is installed on the rotating shaft. The mounting base includes a handle base and a transmission base. An adjustment handle is provided at the handle base, and the adjustment handle is connected to a rotating shaft mounted on the handle base. A rotating part is provided at the transmission base, and the rotating part is connected to the rotating shaft and also to a transmission plate. A connecting component is provided between the transmission plate and the adjustment handle, with one end of the connecting component rotatably connected to the adjustment handle and the other end rotatably connected to the transmission plate.