A mixed ventilation device for subway tunnel construction

Abstract

The present application relates to the field of ventilation technology, especially to a mixed ventilation device for subway tunnel construction, comprising a first shaft on the tunnel, the left and right sides of the first shaft are provided with a second shaft for exhaust on the tunnel, a plurality of axial flow fans are evenly arranged in the tunnel, a jet fan is arranged in the first shaft, and a negative pressure area is arranged on the lower side of the jet fan; a support assembly comprising an inner support frame, an outer mounting frame and a fixing frame is used to fix the jet fan in the negative pressure area; a channel assembly is in communication with the bottom of the jet fan and is used to accelerate the air flow rate of the negative pressure area. The present application effectively promotes air flow, can significantly reduce the concentration of pollutants such as silica dust, toxic gases and harmful vapors in the tunnel, and provides a healthier working environment for workers by introducing fresh air and discharging dirty air.

Description

Technical Field

[0001] This invention relates to the field of ventilation technology, and more specifically to a hybrid ventilation device for construction in subway tunnels. Background Technology

[0002] Currently, in subway tunnels and sections, the tunnels are subject to various construction operations such as blasting, shotcreting, mechanical drilling, and vehicle transportation. These operations result in high humidity, poor visibility, long ventilation distances, complex airflow, and poor ventilation, which can easily lead to construction safety hazards and seriously harm the physical and mental health of workers inside the tunnels.

[0003] Therefore, to address the aforementioned issues, conventional three sets of fans will be used to supply fresh air to the tunnel ducts within the entire tunnel where the underground stations and the arch foot of the tunnel sections have been fully connected. However, according to on-site measurements, the wind speed inside the tunnel was generally less than 0.3 m / s when the three sets of 2×55 kW fans supplied air to the tunnel at eight measuring points. In addition, the long and winding ducts for supplying fresh air are prone to causing significant wind loss, low air exchange efficiency, and irregular wind direction.

[0004] The above content is only used to help understand the technical solution of the present invention and does not represent an admission that the above content is the closest prior art. Summary of the Invention

[0005] The purpose of this invention is to overcome the above-mentioned shortcomings and provide a hybrid ventilation device for construction in subway tunnels.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a hybrid ventilation device for construction in a subway tunnel, comprising a first vertical shaft excavated and constructed on the tunnel, and second vertical shafts for exhaust ventilation constructed on both the left and right sides of the first vertical shaft, wherein several axial flow fans are evenly distributed between the first vertical shaft and the second vertical shafts in the tunnel, and a jet fan is installed in the first vertical shaft, wherein a negative pressure zone is provided at the air inlet on the lower side of the jet fan;

[0007] The support assembly includes an inner support frame disposed outside the jet fan, an outer mounting frame spaced apart outside the inner support frame, and a fixing frame disposed on the inner bottom surface of the outer mounting frame and connected to the wellhead below the first vertical shaft, for fixing the jet fan in the negative pressure zone.

[0008] A channel assembly, disposed inside the fixed frame and connected to the bottom of the jet fan fixed inside the inner support frame, is used to accelerate and increase the outward airflow velocity of the negative pressure zone.

[0009] Furthermore, the channel component includes:

[0010] A column is located at the lower part of the inner support frame and communicates with the bottom of the jet fan;

[0011] Multiple variable-diameter spiral channels are evenly arranged along the circumference of the column to narrow the airflow channels and increase the upward force of the air.

[0012] A diffuser, located on the top surface of the column and connected to the outlet of the multiple converging variable-diameter spiral channels, is used to concentrate and accelerate the airflow velocity after the variable-diameter spiral channels.

[0013] Furthermore, the lower part of the column is provided with an annular cleaning block that rotates on the inner bottom surface of the outer mounting bracket.

[0014] Furthermore, the column is provided with a liquid inlet channel communicating with the inside of the diffuser, and the external opening of the liquid inlet channel is provided with a delivery pipe fixed on the outer surface of the column. A pump body is provided at the open end of the delivery pipe away from the column.

[0015] The pump body is located on the bottom surface of the outer mounting bracket.

[0016] Furthermore, a water collection trough is provided on the inner bottom surface of the external mounting bracket;

[0017] The water collection tank is located within the enclosure area of ​​the fixed frame and outside the channel assembly.

[0018] Furthermore, a lead screw is provided in one part of the water collection tank, which is fitted onto the column. A gear is provided on the lead screw, and the horizontal surface of the gear meshes with an outer gear ring fixed to the circumference of the annular cleaning block.

[0019] Furthermore, the lower end of the inner support frame is evenly provided with several vertical guide plates for guiding and limiting the channel assembly.

[0020] Furthermore, the water collection tank is detachably equipped with a block to seal the water collection tank.

[0021] Furthermore, the inner support frame, the outer mounting frame, the fixing frame, the column, and the jet fan are coaxially arranged.

[0022] Compared with the prior art, the present invention has the following beneficial effects: The channel assembly of the present invention can obtain a higher air velocity during the process of guiding the air flow through the first vertical shaft in the negative pressure zone. The gradually narrowing variable diameter spiral channel is similar to the nozzle effect. Furthermore, the spiral shape of the variable diameter spiral channel can increase the air velocity by bending and guiding the air flow. The diffuser connected after the narrowing variable diameter spiral channel further concentrates and accelerates the air velocity. In addition, through the setting of the annular cleaning block, the liquid inlet channel and the conveying pipe installed on the liquid inlet channel, the pump body, the lead screw and the gear and external gear ring installed on the lead screw, with the cooperation of the above structure, on the one hand, the water source is directly connected to the pump body and flows through the conveying pipe and inlet. Liquid is diverted into the variable-diameter spiral channel evenly distributed throughout the column for dust flushing. Simultaneously, as the channel assembly descends, power transmission via screws, gears, and an external gear ring enables a rotating cleaning action on the outer circumference of the column using an annular cleaning block, effectively solving the dust adhesion problem. Finally, the distribution design of several axial flow fans evenly distributed within the tunnel and between the first and second shafts, along with a jet fan within the first shaft, effectively promotes airflow, significantly reducing the concentration of pollutants such as silica dust, toxic gases, and harmful vapors within the tunnel. Furthermore, the introduction of fresh air and the exhaust of polluted air provide a healthier working environment for personnel. Attached Figure Description

[0023] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0024] Figure 1 This is a perspective view of the overall structure of an embodiment of the present invention.

[0025] Figure 2 This is a three-dimensional structural diagram of the relevant structures within the negative pressure zone according to an embodiment of the present invention.

[0026] Figure 3 for Figure 2 Enlarged structural diagram at point A in the middle;

[0027] Figure 4 This is a three-dimensional structural diagram of the relevant structures within the negative pressure zone according to an embodiment of the present invention;

[0028] Figure 5 This is a perspective view of a channel component according to an embodiment of the present invention;

[0029] Figure 6 This is a three-dimensional structural view of a channel assembly according to an embodiment of the present invention from a cross-sectional perspective;

[0030] Figure 7 This is a three-dimensional structural diagram of a variable diameter spiral channel according to an embodiment of the present invention.

[0031] In the diagram: 1. Tunnel; 2. First vertical shaft; 3. Second vertical shaft; 4. Axial flow fan; 5. Jet fan; 6. Support assembly; 61. Inner support frame; 611. Vertical guide vane; 62. Outer mounting frame; 63. Fixing frame; 7. Channel assembly; 71. Column; 72. Variable diameter spiral channel; 73. Diffuser; 8. Annular cleaning block; 9. Liquid inlet channel; 91. Pipeline; 92. Pump body; 10. Water collection tank; 11. Lead screw; 111. Gear; 112. External gear ring; 12. Block. Detailed Implementation

[0032] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0034] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, "multiple" refers to two or more. Moreover, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0035] like Figure 1-7As shown, the present invention discloses a hybrid ventilation device applied in a subway station tunnel 1 constructed underground using a deep-buried and cut-and-cover method. The device includes a first vertical shaft 2 excavated and constructed on the tunnel 1, and second vertical shafts 3 constructed on both the left and right sides of the first vertical shaft 2 for ventilation. Several axial flow fans 4 are evenly distributed between the first vertical shaft 2 and the second vertical shafts 3 in the tunnel 1. A jet fan 5 is installed in the first vertical shaft 2, and a negative pressure zone is provided at the lower air inlet of the jet fan 5.

[0036] The support assembly 6 includes an inner support frame 61 disposed outside the jet fan 5, an outer mounting frame 62 spaced apart outside the inner support frame 61, and a fixing frame 63 disposed on the inner bottom surface of the outer mounting frame 62 and connected to the lower wellhead of the first vertical shaft 2, for fixing the jet fan 5 in the negative pressure zone.

[0037] The channel assembly 7 is disposed inside the fixed frame 63 and communicates with the bottom of the jet fan 5 fixed inside the inner support frame 61, and is used to accelerate and increase the outward airflow velocity of the negative pressure zone.

[0038] In specific implementation, a first vertical shaft 2 with good ventilation conditions to the outside ground is selected in tunnel 1 according to the exhaust environment and conditions. A jet fan 5 is added in the first vertical shaft 2 to form a negative pressure zone, which can guide the air flow in tunnel 1 and increase the upward air force. In addition, several axial flow fans 4 are evenly configured in the area formed by the two second vertical shafts 3 on both sides of the first vertical shaft 2 connected to tunnel 1, which can increase the air velocity in tunnel 1 and interfere with the airflow path in tunnel 1.

[0039] A bracket assembly 6, consisting of an inner support frame 61, an outer mounting frame 62, and a fixing frame 63, is welded together at the lower end of the first vertical shaft 2. On the one hand, the jet fan 5 can be detachably assembled in the inner support frame 61, and on the other hand, the bracket assembly 6 of this embodiment can be fixed to the inner wall of the tunnel 1 corresponding to the lower end of the first vertical shaft 2 through the mounting surfaces on both sides of the outer mounting frame 62. The overall installation and disassembly are convenient and the maintenance is simple.

[0040] By using the channel assembly 7 installed at the bottom of the jet fan 5, which is connected to the inside of the fixed frame 63, a higher air velocity can be obtained during the process of guiding the air flow through the first vertical shaft 2 in the negative pressure zone, thus supplementing or increasing the outward exhaust wind speed.

[0041] It should be noted that the following should be referenced: 《Technical Specification for Safety in Highway Engineering Construction》JTG F90-2015

[0042] S1, the ventilation volume Q required for the maximum number of people working simultaneously in tunnel 1. 人 In general areas, each person is supplied with 3.0m³ per minute. 3Fresh air per minute (based on 100 people in the tunnel, 300m / min) 3 );

[0043] S2, based on the ventilation volume Q0 required to dilute carbon monoxide (CO) to the maximum permissible concentration after blasting, each kilogram of explosive can produce the equivalent of 40L of carbon monoxide gas (blasting inside tunnel 1, based on a maximum of 200kg of explosive, produces 8m³ of carbon monoxide gas). 3 Carbon monoxide);

[0044] S3, the ventilation volume Q required to dilute harmful gases generated by internal combustion machinery operating simultaneously in Tunnel 1 to an allowable concentration. 内 When using diesel machinery inside the cave, the speed can be 4.5 m³ / min per kilowatt. 3 Air volume calculation (based on 3 PC300 excavators + 3 PC60 excavators + 5 muck trucks + 4 tank trucks in Tunnel 1): (3×187 + 3×41 + 5×210 + 4×132)×0.8 = 1809.6, the harmful gas emission rate is 1809.6 m³ / min. 3 );

[0045] S4, the ventilation volume Q required to meet the minimum wind speed (minimum wind speed for dust removal). 风 The airflow rate for full-section excavation should not be less than 0.15 m / s, and for tunnels excavated in sections, it should not be less than 0.25 m / s, but neither should exceed 6 m / s (the airflow rate per minute is 0.15 × 180 × 60 = 1620 m³ / s). 3 );

[0046] S5, Total ventilation volume calculation: Q 总 =max(Q 人 ,Q0,Q 内 Q 风 Here, "max" indicates taking the maximum value. Conclusion: Q 总 =1809.6m 3 / min;

[0047] S6, Configuration of jet fan 5 in tunnel 1:

[0048] Based on a maximum air volume of 1809.6m³ 3 / min, the air volume of the 37kW jet fan 5 is 34.8 × 60 = 2088 m³ / min. 3 The site is equipped with one 37kW jet fan, and the air volume can meet the on-site construction requirements.

[0049] S7, Calculate the equipment configuration for axial flow fan 4 during tunnel 1 construction:

[0050] The calculation is based on the net cross-sectional area (A), desired wind speed (V), and ventilation frequency (n) of tunnel 1.

[0051] Formula: Q = V × A × n × 3600 (where Q is the air volume, in m³ / s) 3 / h; V is wind speed, in m / s; A is the net cross-sectional area of ​​tunnel 1, in m². 2 ; n represents the number of ventilations, in times / hour; 3600 is the hour-revolutions-second coefficient)

[0052] Q=0.15×300×1×3600=162000m 3 (Referring to the "Technical Specification for Tunnel Construction", the minimum wind speed should not be less than 0.15 m / s);

[0053] S8. In summary, the site adopts a mixed ventilation method of vertical shaft supply and exhaust + jet fan. The second vertical shaft 3 on both sides is used as a natural ventilation shaft, and the first vertical shaft 2 is used as an exhaust shaft. One 37kw jet fan 5 is configured to form a local negative pressure zone and guide the air flow direction in the tunnel. Five 11kw axial flow fans 4 are evenly configured in the tunnel to increase the air flow velocity in the tunnel.

[0054] S9, Working Environment Air Quality Monitoring:

[0055] Two testing points were selected for the two ventilation modes on site. Testing was conducted in 2-3 time periods for the blasting operation and drilling and slag removal processes. The testing items included silica dust, carbon monoxide, carbon dioxide, nitrogen oxides, oxygen, hydrogen sulfide, and free silica content.

[0056] Among them, the parameters for the silica dust item are:

[0057] In mixed ventilation mode, the air volume decreased by 45% after 15 minutes of blasting operations and by 75% after 30 minutes.

[0058] In conventional ventilation mode, the ventilation rate drops by 18% after 15 minutes of blasting operations and by 30% after 30 minutes.

[0059] In one embodiment, the channel component 7 includes:

[0060] The column 71 is located at the lower part of the inner support frame 61 and is connected to the bottom of the jet fan 5;

[0061] Multiple variable-diameter spiral channels 72 are evenly arranged along the circumference of the column 71 to narrow the airflow channel and increase the upward force of the air.

[0062] A diffuser 73, located on the top surface of the column 71 and connected to the outlets of multiple converging variable-diameter spiral channels 72, is used to concentrate and accelerate the airflow velocity after the variable-diameter spiral channels 72. This design, with the column 71 connected to the jet fan 5 installed at the lower part of the inner support frame 61, having several uniformly distributed variable-diameter spiral channels 72 machined inside and outside the column 71 along its circumference, and a diffuser 73 connecting the top outlets of several variable-diameter spiral channels 72, allows air guided by the axial flow fan 4 and the jet fan 5 to enter through the lower inlet of the variable-diameter spiral channel 72. The special structure of the variable-diameter spiral channel 72 increases the airflow velocity, effectively concentrating the airflow direction.

[0063] It should be noted that the variable diameter section structure on the variable diameter spiral channel 72 makes the air channel gradually narrow, similar to the nozzle effect, which can increase the air flow rate.

[0064] The external spiral shape structure on the variable diameter spiral channel 72 can increase the air velocity by bending and guiding the airflow direction;

[0065] The diffuser 73 connected to the upper end of the variable diameter spiral channel 72, which is used after the variable diameter spiral channel 72, further concentrates and accelerates the airflow.

[0066] In one embodiment, the lower part of the column 71 is provided with an annular cleaning block 8 that rotates on the inner bottom surface of the outer mounting bracket 62. With this design, by using an annular guide rail to rotatably connect the annular cleaning block 8 to the inner bottom surface of the outer mounting bracket 62, dust can be cleaned from the outer surface of the column 71 by utilizing the contact between the inner surface of the annular cleaning block 8 and the cleaning surface of the column 71.

[0067] In one embodiment, the column 71 is provided with a liquid inlet channel 9 that communicates with the inside of the diffuser 73. The external opening of the liquid inlet channel 9 is provided with a delivery pipe 91 fixed to the outer surface of the column 71. A pump body 92 is provided at one end of the delivery pipe 91 away from the column 71.

[0068] The pump body 92 is disposed on the outer bottom surface of the outer mounting bracket 62. This design allows for the use of a liquid inlet channel 9, machined within the column 71 and communicating with the diffuser 73. A delivery pipe 91 is inserted into the open end of the liquid inlet channel 9, and the pump body 92 is inserted into the other end of the delivery pipe 91. The power generated by the pump body 92 propels the cleaning fluid or water through the delivery pipe 91 and the liquid inlet channel 9 to the diffuser 73. This water then flows from the upper open end of several variable-diameter spiral channels 72 to the lower open end, achieving the effect of cleaning the interior of the variable-diameter spiral channels 72.

[0069] It should be noted that the pump body 92 is bolted to the outer bottom surface of the outer mounting bracket 62, which provides convenience for maintenance and repair.

[0070] It should be noted that the inlet on one side of the pump body 92 is connected to an external water source.

[0071] In one embodiment, a water collection tank 10 is provided on the inner bottom surface of the outer mounting bracket 62;

[0072] The water collection tank 10 is located within the area enclosed by the fixing frame 63 and outside the channel assembly 7. This design allows the water collection tank 10, which is grooved by turning the bottom surface of the outer mounting frame 62 and the area surrounding the channel assembly 7, to collect the cleaning waste liquid or wastewater flowing out from the open end of the variable diameter spiral channel 72, achieving the effect of temporary storage and collection.

[0073] In one embodiment, a lead screw 11 is provided within the water collection tank 10, which engages with the column 71. A gear 111 is mounted on the lead screw 11, and the horizontal surface of the gear 111 meshes with an external gear ring 112 fixed to the circumference of the annular cleaning block 8. This design allows the lead screw 11, which is rotatably connected within the water collection tank 10, to be threadedly engaged with a support block welded to the upper side of the column 71 at its upper end. The lower end of the lead screw 11 extends through the bottom surface of the water collection tank 10 to the outside. By operating the outer end of the lead screw 11, the column 71 connected to the threaded support block can be moved vertically, enabling the column 71 to be lowered for periodic maintenance.

[0074] Furthermore, by mounting a fixed gear 111 on the lead screw 11 and an outer gear ring 112 meshing with the gear 111 on the outer circumference of the annular cleaning block 8, the rotation of the lead screw 11 can drive the gear 111 to rotate, causing the outer gear ring 112 meshing with the gear 111 to rotate, which in turn drives the annular cleaning block 8 to rotate, thus achieving the goal of cleaning the outer surface of the column 71 with the annular cleaning block 8 while the column 71 moves downward.

[0075] In one embodiment, the lower end of the inner support frame 61 is uniformly provided with several vertical guide plates 611 for guiding and limiting the channel assembly 7. This design, by welding several uniformly distributed vertical guide plates 611 to the lower end of the inner support frame 61, can provide vertical guidance and limitation for the column 71 formed on the channel assembly 7, thereby assisting in realizing the linear movement of the column 71 in the vertical direction.

[0076] In one embodiment, a plug 12 is detachably provided on the water collection tank 10 to close the water collection tank 10. With this design, the plug 12, which can be detachably installed in a hole machined on the bottom surface of the water collection tank 10, can close the water collection tank 10 to collect waste liquid or wastewater after cleaning, or it can open the water collection tank 10 to centrally discharge waste liquid or wastewater.

[0077] In one embodiment, the inner support frame 61, the outer mounting frame 62, the fixing frame 63, the column 71, and the jet fan 5 are coaxially arranged. This design, through the coaxial design of the above structures, ensures that the airflow path does not deviate, and that the installation and positioning are accurate and easy to operate.

[0078] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

Claims

1. A mixed ventilation device for construction in a subway tunnel, comprising a first shaft (2) excavated on a tunnel (1) for construction, and a second shaft (3) for exhaust air excavated on the tunnel (1) on both sides of the first shaft (2), characterized in that: The tunnel (1) is evenly provided with several axial flow fans (4) distributed between the first shaft (2) and the second shaft (3), the first shaft (2) is provided with a jet fan (5), the lower side air inlet of the jet fan (5) is provided with a negative pressure area; A support assembly (6) is arranged outside the jet fan (5), an outer mounting frame (62) is arranged outside the inner support frame (61), and a fixing frame (63) is arranged on the inner bottom surface of the outer mounting frame (62) and connected with the lower well mouth of the first shaft (2), which is used to fix the jet fan (5) in the negative pressure area; A channel assembly (7) is arranged inside the fixing frame (63) and communicates with the bottom of the jet fan (5) fixed in the inner support frame (61), which is used to accelerate the outward air flow rate of the negative pressure area; The channel assembly (7) comprises: A column (71) is arranged at the lower part of the inner support frame (61) and communicates with the bottom of the jet fan (5); A variable-diameter spiral channel (72) is arranged on the peripheral surface of the column (71) and is used to shrink the air flow channel and increase the air rising power; A diffusion port (73) is arranged on the top surface of the column (71) and communicates with the exhaust port of the variable-diameter spiral channel (72), which is used to concentrate and accelerate the air flow rate after the variable-diameter spiral channel (72); The column (71) is provided with a liquid inlet channel (9) communicating with the inside of the diffusion port (73), and the outer opening of the liquid inlet channel (9) is provided with a delivery pipe (91) fixed on the outer surface of the column (71), and the end of the delivery pipe (91) away from the column (71) is provided with a pump body (92); The pump body (92) is arranged on the outer bottom surface of the outer mounting frame (62).

2. The hybrid ventilation device for use in the construction of a subway tunnel according to claim 1, characterized in that: The lower part of the column (71) is provided with a ring-shaped cleaning block (8) rotating on the inner bottom surface of the outer mounting frame (62).

3. The hybrid ventilation device for use in a subway tunnel construction according to claim 2, characterized in that: The inner bottom surface of the outer mounting frame (62) is provided with a water collecting groove (10); The water collecting groove (10) is arranged in the wrapping area of the fixing frame (63) and on the outer side of the channel assembly (7).

4. The hybrid ventilation device for use in a subway tunnel construction according to claim 3, characterized in that: A lead screw (11) is arranged in the water collecting groove (10) and matched with the column (71), the lead screw (11) is provided with a gear (111), and the horizontal surface of the gear (111) is engaged with an outer gear ring (112) fixed on the peripheral surface of the ring-shaped cleaning block (8).

5. The hybrid ventilation device for use in a subway tunnel construction according to claim 1, characterized in that: The lower end of the inner support frame (61) is uniformly provided with several vertical guide plates (611) for guiding and limiting the channel assembly (7).

6. The hybrid ventilation device for use in a subway tunnel construction according to claim 3, characterized in that: A blocking block (12) is detachably arranged on the water collecting groove (10) to close the water collecting groove (10).

7. The hybrid ventilation device for use in underground tunnel construction of claim 1, wherein: The inner support frame (61), the outer mounting frame (62), the fixing frame (63), the column (71) and the jet fan (5) are coaxially arranged.

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