Buried garage smoke exhaust device and smoke exhaust method

Abstract

The invention discloses a buried garage smoke exhaust device and a smoke exhaust method, and belongs to the technical field of buried garage smoke exhaust devices. The buried garage smoke exhaust device comprises a smoke exhaust machine room and further comprises a smoke exhaust air pipe, and an overhaul channel, a main body room and a transfer room are arranged in the smoke exhaust machine room. In order to solve the problem that when an existing underground garage is built, an air pipe in a smoke exhaust system is too high, a large amount of civil construction cost needs to be invested in the early stage, and then the building cost of the underground garage is too high, a smoke exhaust machine room is arranged on an overburden layer above a garage space, and smoke in the garage space enters a drainage air pipe and then enters the drainage air pipe; the drainage air pipes are all arranged in the beam nests, so that the influence of the air pipes on the garage space height is reduced, the position of the smoke exhaust machine room is selected at the junction of the basement main beams, the manufacturing cost of the smoke exhaust machine room can be reduced under the condition that the structural requirement is met, and therefore the construction cost of the underground garage is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of smoke exhaust devices for underground garages, and in particular to a smoke exhaust device and a smoke exhaust method for underground garages. Background Art

[0002] By the end of June 2024, the number of motor vehicles in my country will reach 440 million, of which 345 million will be cars. The growth trend of my country's car ownership is significant, especially the growth of private cars. By the end of 2023, the national civilian car ownership will reach 336.18 million, of which 294.27 million will be private cars. By the end of May 2024, the number of cars will further increase to 340 million. At the same time, with the acceleration of urbanization, land resources are becoming increasingly tight. At this time, designing a basement with high parking efficiency can better cope with the increasing parking pressure. Underground parking garages have more research potential and can create more economic value due to their high construction cost, high operating cost, and difficult equipment operation and maintenance. Compared with ground parking buildings, underground garages have poor ventilation conditions, insufficient lighting, and higher risks in the event of fire. A large number of equipment rooms are often required to ensure the normal operation of the garage. Therefore, in the event of an emergency such as a fire, the smoke exhaust problem is particularly important in underground parking garages.

[0003] In the design of conventional underground garages, two smoke exhaust machine rooms are usually required for each fire compartment. The floor area of ​​a single machine room is about 18 square meters to 24 square meters. Through reasonable adjustments to the building layout and the structural column grid, the space originally set up for the smoke exhaust machine room in the fire compartment can be converted into a parking space. Each fire compartment can park at least 3-4 more cars, greatly improving parking efficiency. Especially for underground garages, the underground smoke exhaust machine room not only occupies parking space, but also, according to the specific use of smoke exhaust, a large number of air ducts need to be drawn out from the basement machine room and evenly arranged in each area of ​​the basement.

[0004] However, the complex and numerous cross-layout of pipelines, coupled with the water supply, drainage pipes, power supply and distribution pipelines and weak current intelligent pipelines in the basement, often require a higher basement height to meet the implementation of these pipelines. Among these pipelines, the HVAC ducts have the largest volume ratio of the medium they transport, which often leads to huge duct sizes, sometimes even up to 2500mm*500mm. Therefore, when existing underground garages are built, the ducts in the smoke exhaust system are too high, which requires a large amount of civil construction costs in the early stage, and thus makes the construction cost of the underground garage too high; therefore, the existing needs are not met, and the present application proposes a smoke exhaust device and a smoke exhaust method for an underground garage. Summary of the invention

[0005] The object of the present invention is to provide a smoke exhaust device and a smoke exhaust method for an underground garage. By arranging a smoke exhaust machine room in the covering layer above the garage space, the smoke in the garage space enters the drainage air duct and is discharged from the air shaft outlet, wherein the drainage air duct is arranged in the beam cavity, thereby reducing the influence of the air duct on the height of the garage space. The location of the smoke exhaust machine room is selected at the junction of the main beams of the basement, thereby reducing the cost of the smoke exhaust machine room while meeting the structural requirements, thereby reducing the construction cost of the underground garage, and solving the problems in the prior art.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a buried car garage smoke exhaust device, including a smoke exhaust room and a smoke exhaust duct, wherein the smoke exhaust duct is located inside the smoke exhaust room, and a centrifugal fan is arranged inside the smoke exhaust duct, wherein the smoke exhaust room is located above the garage space, and the smoke exhaust room is located inside the covering layer, and a first wall and a second wall are arranged inside the smoke exhaust room, and the interior of the smoke exhaust room is divided into an inspection passage, a main room and a transfer room by the first wall and the second wall in sequence, and an air shaft outlet is arranged above the inspection passage, one end of the smoke exhaust duct extends to the inside of the inspection passage through the first wall, and the other end of the smoke exhaust duct extends to the inside of the transfer room through the second wall.

[0007] Preferably, a garage roof is provided above the garage space, a drainage air duct is provided below the garage roof, a grille is provided on the side of the drainage air duct, a transfer air duct is provided inside the transfer room, the lower end of the transfer air duct is connected to the drainage air duct, and the side of the transfer air duct is connected to the smoke exhaust air duct.

[0008] Preferably, a ladder and an air guide duct are provided inside the inspection passage, the air guide duct is connected to one end of the smoke exhaust duct, a door body is provided inside the first wall, a blocking block is provided between the second wall and the smoke exhaust duct, the smoke exhaust duct is installed inside the main room through a fixed seat, a cover plate is provided at the upper end of the air shaft outlet, a guardrail is provided on the side of the air shaft outlet, and aluminum alloy rainproof shutters and insect-proof nets are provided inside the guardrail.

[0009] Preferably, a motor and a transmission rod are provided on one side of the smoke exhaust duct, the motor is fixed on the floor of the main room, the motor is connected to the transmission rod shaft, driven wheels are provided on the top and bottom of the smoke exhaust duct, a first screw rod and a second screw rod are provided inside the smoke exhaust duct, and support frames are provided on both sides of the centrifugal fan.

[0010] Preferably, a driving wheel is provided on the outside of the transmission rod, and the driving wheel is connected to the driven wheel by a belt. The upper and lower parts between the two support frames are provided with a first gear and a second gear, and the first gear and the second gear are meshed. The upper first gear is connected to the first screw rod, the lower first gear is connected to the second screw rod, and the second gear is connected to the driven wheel shaft.

[0011] Preferably, sleeves are provided at the upper and lower parts of the support frame, and scrapers are provided at the sides of the support frame. The upper sleeve is installed on the first screw rod, and the lower sleeve is installed on the second screw rod, and the scraper contacts the inner wall of the smoke exhaust duct.

[0012] A smoke exhaust method for an underground garage is implemented based on an underground garage smoke exhaust device, comprising the following steps:

[0013] Step 1: dig a pre-buried pit inside the covering soil layer above the garage roof, and build a smoke exhaust machine room inside the pre-buried pit. The location of the smoke exhaust machine room is selected at the junction of the main beams of the basement;

[0014] Step 2: Install the drainage duct under the roof of the garage, and install the smoke exhaust duct inside the smoke exhaust room. Then install the transfer duct and the guide duct at both ends of the smoke exhaust duct, and finally connect the drainage duct with the transfer duct.

[0015] Step 3: After the construction of the smoke exhaust room is completed, the personnel can remove the guardrail, then enter the maintenance passage along the ladder, and finally enter the main room through the door. At this time, the smoke exhaust duct and centrifugal fan can be inspected and repaired;

[0016] Step 4: During maintenance, the personnel starts the motor, and the motor drives the first screw and the second screw to rotate through the transmission rod, so that the two support frames move to the two ends of the first screw respectively, thereby scraping off the dust and attachments on the inner wall of the smoke exhaust duct, which can ensure that the smoke exhaust volume of the smoke exhaust duct is within the design range;

[0017] Step 5. After a fire occurs inside the garage space, the centrifugal fan is started, so that the smoke in the garage space passes through the drainage air duct, transfer air duct, smoke exhaust air duct and guide air duct in turn, enters the interior of the maintenance passage, and is finally discharged from the air shaft outlet.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. The present invention sets the smoke exhaust machine room in the soil layer above the garage space. After the smoke in the garage space enters the drainage air duct, it is discharged from the air shaft outlet. The drainage air duct is arranged in the beam cavity, avoiding the need to set the air duct under the beam, thereby reducing the influence of the air duct on the height of the garage space. The location of the smoke exhaust machine room is selected at the junction of the main beams of the basement, so that the cost of the smoke exhaust machine room can be reduced while meeting the structural requirements. At the same time, a ladder is arranged below the air shaft outlet. During maintenance, personnel can enter the smoke exhaust machine room along the ladder from the air shaft outlet, so that the air shaft outlet and the maintenance passage are combined into one, and there is no need to set up a separate maintenance passage, thereby reducing the construction cost of the underground garage.

[0020] 2. The present invention arranges a guardrail on the side of the air shaft outlet. After removing the guardrail, the personnel can climb the ladder from the air shaft outlet to the bottom of the maintenance passage, pass through the door body to enter the interior of the main room, and perform maintenance work on the smoke exhaust duct and the centrifugal fan. During maintenance, the personnel start the motor, and the motor drives the first screw rod and the second screw rod to rotate through the transmission rod, so that the two support frames move to the two ends of the first screw rod respectively, and then scrape off the dust and attachments on the inner wall of the smoke exhaust duct, which can ensure that the smoke exhaust volume of the smoke exhaust duct is always within the design range, thereby improving the smoke exhaust efficiency of the smoke exhaust duct when it is in use. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is an overall schematic diagram of the present invention;

[0022] Figure 2 It is a cross-sectional view of a smoke exhaust room of the present invention;

[0023] Figure 3 It is a schematic diagram of the partial structure of the smoke exhaust duct of the present invention;

[0024] Figure 4 It is a schematic diagram of the local structure of the support frame of the present invention;

[0025] Figure 5 It is a schematic diagram of the meshing of the first gear and the second gear of the present invention.

[0026] In the figure: 1. Smoke exhaust room; 101. Maintenance passage; 1011. Ladder; 102. Main room; 103. Transfer room; 104. First wall; 1041. Door; 105. Second wall; 1051. Blocking block; 106. Air shaft outlet; 1061. Cover plate; 1062. Guardrail; 107. Fixed seat; 2. Overburden; 201. Garage roof; 202. Garage space; 3. Drainage duct; 301. Grille; 302. Transfer duct; 4. Smoke exhaust duct; 401. Drainage duct; 5. Motor; 501. Transmission rod; 502. Driving wheel; 503. Driven wheel; 504. First gear; 505. Second gear; 6. First screw rod; 601. Second screw rod; 7. Support frame; 701. Scraper; 702. Sleeve; 8. Centrifugal fan. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] In order to solve the problem that the air duct in the smoke exhaust system of the existing underground garage is too high during construction, which requires a large amount of civil construction costs in the early stage, and thus makes the construction cost of the underground garage too high, please refer to Figure 1-5 , this embodiment provides the following technical solutions:

[0029] A smoke exhaust device for an underground garage includes a smoke exhaust room 1, characterized in that it also includes a smoke exhaust duct 4, the smoke exhaust duct 4 is located inside the smoke exhaust room 1, a centrifugal fan 8 is arranged inside the smoke exhaust duct 4, the smoke exhaust room 1 is located above the garage space 202, the smoke exhaust room 1 is located inside the covering layer 2, a first wall 104 and a second wall 105 are arranged inside the smoke exhaust room 1, the interior of the smoke exhaust room 1 is divided into an inspection passage 101, a main room 102 and a transfer room 103 by the first wall 104 and the second wall 105 in sequence, an air shaft outlet 106 is arranged above the inspection passage 101, one end of the smoke exhaust duct 4 passes through the first wall 104 and extends to the interior of the inspection passage 101, and the other end of the smoke exhaust duct 4 passes through the second wall 105 and extends to the interior of the transfer room 103.

[0030] A garage roof 201 is disposed above the garage space 202, a drainage duct 3 is disposed below the garage roof 201, a grille 301 is disposed on the side of the drainage duct 3, a transfer duct 302 is disposed inside the transfer chamber 103, the lower end of the transfer duct 302 is connected to the drainage duct 3, and the side of the transfer duct 302 is connected to the exhaust duct 4, a ladder 1011 and a drainage duct 401 are disposed inside the inspection passage 101, and the drainage duct 401 is disposed on the side of the transfer chamber 103. 1 is connected to one end of the smoke exhaust duct 4, a door body 1041 is arranged inside the first wall 104, a blocking block 1051 is arranged between the second wall 105 and the smoke exhaust duct 4, the smoke exhaust duct 4 is installed inside the main room 102 through a fixing seat 107, a cover plate 1061 is arranged at the upper end of the air shaft outlet 106, a guardrail 1062 is arranged on the side of the air shaft outlet 106, and an aluminum alloy rainproof shutter and an insect-proof net are arranged inside the guardrail 1062.

[0031] Specifically, the material of the smoke exhaust duct 4 is heat-resistant, moisture-resistant, and non-flammable to ensure stability in high temperature and high humidity environments. The designed smoke exhaust volume of the centrifugal fan 8 is 15750CMH, the size of the drainage duct 3 is 1000mmX400mm, the bottom elevation of the drainage duct 3 is 2.45 meters from the finished surface of the basement building, the size of the wind shaft outlet 106 is 1000mmX250mm, the center of the wind shaft outlet 106 is 2.70 meters away from the finished surface of the basement building, the dB value of the smoke-proof partition is 0.60 meters, the maximum smoke exhaust volume of a single wind shaft outlet 106 is 4000CMH, and a single centrifugal fan 8 is equipped with four wind shaft outlets 106;

[0032] Two to three smoke exhaust rooms 1 are required for each fire protection unit of the garage space 202. When no fire protection units are divided, two to four smoke exhaust rooms 1 are required for each fire protection zone. After the smoke in the garage space 202 enters the drainage air duct 3, it is discharged from the air shaft outlet 106. The drainage air duct 3 is arranged in the beam cavity, avoiding the need to set the air duct under the beam, thereby reducing the impact of the air duct on the height of the garage space 202. The location of the smoke exhaust room 1 is selected at the junction of the main beam of the basement, so as to reduce the cost of the smoke exhaust room 1 while meeting the structural requirements. At the same time, a ladder 1011 is arranged below the air shaft outlet 106. During maintenance, personnel can enter the smoke exhaust room 1 from the air shaft outlet 106 along the ladder 1011, so that the air shaft outlet 106 and the maintenance passage 101 are combined into one, and there is no need to set up a separate maintenance passage 101, thereby further reducing the construction cost of the underground garage.

[0033] A motor 5 and a transmission rod 501 are provided on one side of the smoke exhaust duct 4. The motor 5 is fixed on the ground of the main room 102. The motor 5 is connected to the transmission rod 501 axis. A driven wheel 503 is provided on the top and bottom of the smoke exhaust duct 4. A first screw rod 6 and a second screw rod 601 are provided inside the smoke exhaust duct 4. Support frames 7 are provided on both sides of the centrifugal fan 8. A driving wheel 502 is provided outside the transmission rod 501. The driving wheel 502 is connected to the driven wheel 503 through a belt. The upper and lower parts between the two support frames 7 are provided with a first gear. 504 and the second gear 505, the first gear 504 and the second gear 505 are meshed, the upper first gear 504 is connected to the first screw rod 6, the lower first gear 504 is connected to the second screw rod 601, the second gear 505 is connected to the driven wheel 503 shaft, the upper and lower parts of the support frame 7 are both provided with sleeves 702, and the side of the support frame 7 is provided with a scraper 701, the upper sleeve 702 is installed on the first screw rod 6, and the lower sleeve 702 is installed on the second screw rod 601, and the scraper 701 contacts the inner wall of the smoke exhaust duct 4.

[0034] Specifically, when the smoke concentration inside the garage space 202 reaches a certain threshold, the photoelectric sensor responds quickly and sends a signal to the control console. The control console automatically alarms and starts the centrifugal fan 8 to extract the smoke out of the control console. The interior of the control console also has a manual operation interface. During daily inspections, personnel can remove the guardrail 1062 and reach the bottom of the inspection passage 101 from the air shaft outlet 106 along the ladder 1011, then pass through the door body 1041 to enter the interior of the main room 102, and inspect the smoke exhaust duct 4 and the centrifugal fan 8. During inspection, the personnel start the motor 5, and the motor 5 drives the first screw rod 6 and the second screw rod 601 to rotate through the transmission rod 501. The first screw rod 6 and the second screw rod 601 are both bidirectional screw rods, so that the two support frames 7 move to the two ends of the first screw rod 6 respectively, and then the dust and attachments on the inner wall of the smoke exhaust duct 4 are scraped off, which can ensure that the smoke exhaust volume of the smoke exhaust duct 4 is always within the design range, improve the smoke exhaust efficiency of the smoke exhaust duct 4 when it is in use, and further ensure the timeliness of smoke exhaust when a fire occurs.

[0035] A smoke exhaust method for an underground garage is implemented based on a smoke exhaust device for an underground garage, and is characterized by comprising the following steps:

[0036] Step 1: dig a pre-buried pit inside the covering layer 2 above the garage roof 201, and build a smoke exhaust machine room 1 inside the pre-buried pit. The location of the smoke exhaust machine room 1 is selected at the junction of the main beams of the basement;

[0037] Step 2: Install the drainage duct 3 under the garage roof 201, and install the smoke exhaust duct 4 inside the smoke exhaust room 1, then install the transfer duct 302 and the guide duct 401 at both ends of the smoke exhaust duct 4, and finally connect the drainage duct 3 with the transfer duct 302;

[0038] Step 3: After the construction of the smoke exhaust room 1 is completed, the personnel can remove the guardrail 1062, then enter the interior of the maintenance passage 101 along the ladder 1011, and finally enter the interior of the main room 102 through the door body 1041. At this time, the smoke exhaust duct 4 and the centrifugal fan can be inspected and repaired;

[0039] Step 4: During maintenance, the maintenance personnel starts the motor 5, and the motor 5 drives the first screw rod 6 and the second screw rod 601 to rotate through the transmission rod 501, so that the two support frames 7 move to the two ends of the first screw rod 6 respectively, thereby scraping off the dust and attachments on the inner wall of the smoke exhaust duct 4, which can ensure that the smoke exhaust volume of the smoke exhaust duct 4 is within the design range;

[0040] Step 5. After a fire occurs inside the garage space 202, the centrifugal fan 8 is started, so that the smoke in the garage space 202 passes through the drainage air duct 3, the transfer air duct 302, the smoke exhaust air duct 4 and the guide air duct 401 in sequence, and then enters the interior of the maintenance passage 101, and is finally discharged from the air shaft outlet 106.

[0041] Working principle: After the smoke in the garage space 202 enters the drainage air duct 3, it is discharged from the air shaft outlet 106, wherein the drainage air duct 3 is arranged in the beam cavity, avoiding the need to set the air duct under the beam, thereby reducing the impact of the air duct on the height of the garage space 202, and the location of the smoke exhaust room 1 is selected at the junction of the main beams of the basement, so that the cost of the smoke exhaust room 1 can be reduced while meeting the structural requirements. At the same time, a ladder 1011 is set below the air shaft outlet 106. During maintenance, personnel can enter the smoke exhaust room 1 from the air shaft outlet 106 along the ladder 1011, so that the air shaft outlet 106 and the maintenance passage 101 are combined into one, and there is no need to set up a separate maintenance passage 101, thereby reducing the construction cost of the underground garage.

[0042] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0043] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A smoke exhaust device for an underground garage, comprising a smoke exhaust room (1), characterized in that: The invention also comprises a smoke exhaust duct (4), the smoke exhaust duct (4) being located inside the smoke exhaust machine room (1), the smoke exhaust duct (4) being provided with a centrifugal fan (8), the smoke exhaust machine room (1) being located above the garage space (202), the smoke exhaust machine room (1) being located inside the covering layer (2), the smoke exhaust machine room (1) being provided with a first wall (104) and a second wall (105), the interior of the smoke exhaust machine room (1) being divided into an inspection passage (101), a main room (102) and a transfer room (103) by the first wall (104) and the second wall (105) in sequence, an air shaft outlet (106) being provided above the inspection passage (101), one end of the smoke exhaust duct (4) passing through the first wall (104) and extending to the interior of the inspection passage (101), and the other end of the smoke exhaust duct (4) passing through the second wall (105) and extending to the interior of the transfer room (103).

2. The underground car garage smoke exhaust device according to claim 1, characterized in that: A garage roof (201) is arranged above the garage space (202), a drainage air duct (3) is arranged below the garage roof (201), a grille (301) is arranged on the side of the drainage air duct (3), a transfer air duct (302) is arranged inside the transfer room (103), the lower end of the transfer air duct (302) is connected to the drainage air duct (3), and the side of the transfer air duct (302) is connected to the smoke exhaust air duct (4).

3. The underground car garage smoke exhaust device according to claim 1, characterized in that: The inspection passage (101) is provided with a ladder (1011) and a guide air duct (401), the guide air duct (401) is connected to one end of the smoke exhaust air duct (4), the first wall (104) is provided with a door body (1041), a blocking block (1051) is provided between the second wall (105) and the smoke exhaust air duct (4), the smoke exhaust air duct (4) is installed inside the main room (102) through a fixing seat (107), a cover plate (1061) is provided at the upper end of the air shaft outlet (106), a guardrail (1062) is provided on the side of the air shaft outlet (106), and an aluminum alloy rainproof shutter and an insect-proof net are provided inside the guardrail (1062).

4. The underground car garage smoke exhaust device according to claim 1, characterized in that: A motor (5) and a transmission rod (501) are provided on one side of the smoke exhaust duct (4); the motor (5) is fixed on the floor of the main room (102); the motor (5) is axially connected to the transmission rod (501); driven wheels (503) are provided on the top and bottom of the smoke exhaust duct (4); a first screw rod (6) and a second screw rod (601) are provided inside the smoke exhaust duct (4); and support frames (7) are provided on both sides of the centrifugal fan (8).

5. The underground car garage smoke exhaust device according to claim 4, characterized in that: The transmission rod (501) is provided with a driving wheel (502) on the outside, and the driving wheel (502) is connected to the driven wheel (503) through a belt. The upper and lower parts between the two support frames (7) are provided with a first gear (504) and a second gear (505), and the first gear (504) and the second gear (505) are meshed. The upper first gear (504) is connected to the first screw rod (6), the lower first gear (504) is connected to the second screw rod (601), and the second gear (505) is connected to the shaft of the driven wheel (503).

6. The underground car garage smoke exhaust device according to claim 5, characterized in that: The upper and lower parts of the support frame (7) are both provided with sleeves (702), and the side of the support frame (7) is provided with a scraper (701), the upper sleeve (702) is installed on the first screw rod (6), and the lower sleeve (702) is installed on the second screw rod (601), and the scraper (701) is in contact with the inner wall of the smoke exhaust duct (4).

7. A smoke exhaust method for an underground garage, implemented based on a smoke exhaust device for an underground garage as claimed in any one of claims 1 to 5, characterized in that: The following steps are involved: Step 1: dig a pre-buried pit inside the covering soil layer (2) above the garage roof (201), and build a smoke exhaust machine room (1) inside the pre-buried pit. The location of the smoke exhaust machine room (1) is selected at the junction of the main beams of the basement; Step 2: Install a drainage duct (3) below the garage roof (201), and install a smoke exhaust duct (4) inside the smoke exhaust room (1), then install a transfer duct (302) and a guide duct (401) at both ends of the smoke exhaust duct (4), and finally connect the drainage duct (3) to the transfer duct (302); Step 3: After the construction of the smoke exhaust room (1) is completed, the personnel can remove the guardrail (1062), then go up the ladder (1011) to enter the interior of the inspection passage (101), and finally enter the interior of the main room (102) through the door (1041). At this time, the smoke exhaust duct (4) and the centrifugal fan can be inspected and repaired; Step 4: During maintenance, the personnel starts the motor (5), and the motor (5) drives the first screw rod (6) and the second screw rod (601) to rotate through the transmission rod (501), so that the two support frames (7) move toward the two ends of the first screw rod (6), respectively, and then the dust and attachments on the inner wall of the smoke exhaust duct (4) are scraped off, so as to ensure that the smoke exhaust volume of the smoke exhaust duct (4) is within the design range; Step 5: After a fire occurs inside the garage space (202), the centrifugal fan (8) is started, so that the smoke in the garage space (202) passes through the drainage air duct (3), the transfer air duct (302), the smoke exhaust air duct (4) and the guide air duct (401) in sequence, and then enters the interior of the maintenance passage (101), and is finally discharged from the air shaft outlet (106).

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