Mixed ventilation device for construction in subway tunnel

Abstract

The invention relates to the technical field of ventilation, in particular to a mixed ventilation device for construction in a subway tunnel, which comprises a first vertical shaft excavated and constructed on the tunnel, second vertical shafts for air exhaust are constructed on the left side and the right side of the first vertical shaft on the tunnel, and a plurality of axial flow fans are uniformly arranged in the tunnel. A jet fan is arranged in the first vertical shaft, and a negative pressure area is arranged on the lower side of the jet fan in an air inlet mode. The support assembly comprises an inner supporting frame, an outer mounting frame and a fixing frame and is used for fixing the jet fan in the negative pressure area; and the channel assembly communicates with the bottom of the jet fan and is used for increasing the flow speed of the air exhausted outwards from the negative pressure area. According to the tunnel ventilation system, air flow is effectively promoted, the concentration of silica dust, toxic gas, harmful steam and other pollutants in a tunnel can be remarkably reduced, and a healthier working environment is provided for operators by introducing fresh air and discharging vitiated air.

Description

Technical Field

[0001] The invention relates to the technical field of ventilation, and in particular to a hybrid ventilation device for construction in a subway tunnel. Background Art

[0002] At present, due to the influence of blasting operations, shotcrete operations, mechanical drilling, vehicle transportation and other in-tunnel construction operations in subway underground excavation stations and sections, the air in the tunnel is humid, turbid, and has poor visibility. The ventilation distance in the tunnel is long, the air flow is complex, and the ventilation effect is poor. These conditions can easily cause construction safety hazards and cause serious harm to the physical and mental health of workers in the tunnel.

[0003] Therefore, in order to solve the above problems, three conventional fans will be used to supply fresh air to the pipes in the entire underground tunnel where the subway deep underground station and the arch foot of the section arch are fully connected. However, according to on-site measurements, three groups of 2×55kw fans supply air to the tunnel. At eight measuring points, the wind speed in the tunnel is generally less than 0.3m / s. In addition, the duct for supplying fresh air is long and has many turns, which can easily cause large wind loss, low air exchange efficiency, and chaotic wind direction.

[0004] The above contents are only used to assist in understanding the technical solution of the present invention, and do not constitute an admission that the above contents are the closest prior art. Summary of the invention

[0005] The object of the present invention is to solve the above-mentioned shortcomings and provide a hybrid ventilation device for construction in a subway tunnel.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions: a hybrid ventilation device for construction in a subway tunnel, comprising a first vertical shaft excavated and constructed on the tunnel, second vertical shafts for exhausting air are constructed on both sides of the first vertical shaft, a plurality of axial flow fans distributed between the first vertical shaft and the second vertical shaft are evenly arranged in the tunnel, a jet fan is arranged in the first vertical shaft, and a negative pressure zone is arranged at the lower air inlet of the jet fan;

[0007] A bracket assembly, comprising an inner support frame arranged outside the jet fan, an outer mounting frame arranged outside the inner support frame at intervals, and a fixing frame arranged on the inner bottom surface of the outer mounting frame and connected to the wellhead below the first shaft, for fixing the jet fan in the negative pressure zone;

[0008] The channel component is arranged inside the fixing frame and is connected with the bottom of the jet fan fixed inside the inner supporting frame, and is used to accelerate and increase the air flow rate discharged outward from the negative pressure zone.

[0009] Furthermore, the channel assembly includes:

[0010] A column, arranged at the lower part of the inner support frame and connected to the bottom of the jet fan;

[0011] There are multiple variable diameter spiral channels that are evenly arranged along the circumference of the column, and are used to shrink the air flow channel and increase the air rising power;

[0012] The diffuser is arranged on the top surface of the column and is connected with the discharge ports of the multiple intersecting variable diameter spiral channels, and is used to concentrate and accelerate the flow rate of air after the variable diameter spiral channels.

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

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

[0015] The pump body is arranged on the outer bottom surface of the outer mounting frame.

[0016] Furthermore, a water collecting tank is provided on the inner bottom surface of the outer mounting frame;

[0017] The water collecting tank is arranged in the wrapped area inside the fixing frame and outside the channel assembly.

[0018] Furthermore, a screw rod matched with the column is arranged in one place in the water collection tank, a gear is arranged on the screw rod, and a horizontal surface of the gear is meshed with an outer gear ring fixed on the circumference of the annular cleaning block.

[0019] Furthermore, a plurality of vertical guide plates for guiding and limiting the channel assembly are evenly arranged at the lower end of the inner support frame.

[0020] Furthermore, a blocking block for closing the water collecting trough is detachably provided on the water collecting trough.

[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 provided in the present invention can obtain a higher air flow rate in the process of guiding the air flow direction through the first vertical shaft in the negative pressure zone, and the gradually narrowing variable diameter spiral channel is similar to the nozzle effect, and the spiral-shaped variable diameter spiral channel can bend and guide the air flow direction, which is beneficial to increase the air flow rate, and the diffuser connected after the shrinking and narrowing variable diameter spiral channel further concentrates and accelerates the air flow rate; and through the annular cleaning block, the liquid inlet channel and the delivery pipe installed on the liquid inlet channel, the pump body and the screw rod and the gear and the outer gear ring installed on the screw rod, under the cooperation of the above structure, on the one hand, the water source connected to the pump body is directly passed through the delivery pipe, the inlet The liquid channel is drained into the variable diameter spiral channel evenly opened on the column to wash the dust. On the other hand, when the overall structure of the channel assembly moves downward, the power transmission of the screw, gears and outer ring gear realizes the rotational cleaning of the outer peripheral surface of the column through the annular cleaning block, which effectively solves the problem of dust adhesion. Finally, the distribution structure design of several axial flow fans evenly configured in the tunnel and between the first and second shafts and the jet fans configured in the first shaft effectively promotes air flow, which can significantly reduce the concentration of pollutants such as silica dust, toxic gases and harmful vapors in the tunnel, and provide a healthier working environment for operators by introducing fresh air and exhausting dirty air. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0024] Figure 1 A three-dimensional structural diagram of an overall perspective of an embodiment of the present invention;

[0025] Figure 2 A three-dimensional structural diagram of a related structure in a negative pressure area according to an embodiment of the present invention from one viewing angle;

[0026] Figure 3 for Figure 2 The structure diagram at A is enlarged;

[0027] Figure 4 A three-dimensional structural diagram of a cross-sectional view of a related structure in a negative pressure region according to an embodiment of the present invention;

[0028] Figure 5 A three-dimensional structural diagram of a channel assembly according to an embodiment of the present invention from one perspective;

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

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

[0031] In the figure: 1. tunnel; 2. first vertical shaft; 3. second vertical shaft; 4. axial flow fan; 5. jet fan; 6. bracket 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. delivery pipe; 92. pump body; 10. sump; 11. screw; 111. gear; 112. outer gear ring; 12. blocking block. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. In the absence of conflict, the embodiments in this application and the features in the embodiments can be combined with each other. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without creative work belong to 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 position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0034] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or schemes that A and B meet at the same time. In addition, "multiple" refers to more than two. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0035] like Figure 1-7As shown, a hybrid ventilation device of the present invention is applied to a subway station tunnel 1 constructed underground by deep-buried dark excavation, including a first vertical shaft 2 excavated on the tunnel 1, second vertical shafts 3 for exhausting air are constructed on the left and right sides of the first vertical shaft 2, a plurality of axial flow fans 4 distributed between the first vertical shaft 2 and the second vertical shaft 3 are evenly arranged in the tunnel 1, a jet fan 5 is arranged in the first vertical shaft 2, and a negative pressure zone is arranged at the lower air inlet of the jet fan 5;

[0036] The support assembly 6 includes an inner support frame 61 arranged outside the jet fan 5, an outer mounting frame 62 arranged outside the inner support frame 61 at intervals, and a fixing frame 63 arranged on the inner bottom surface of the outer mounting frame 62 and connected to the wellhead below the first shaft 2, so as to fix the jet fan 5 in the negative pressure area;

[0037] The channel assembly 7 is arranged inside the fixing frame 63 and is connected to the bottom of the jet fan 5 fixed inside the inner supporting frame 61, so as to accelerate and increase the velocity of the air discharged outward from the negative pressure zone.

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

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

[0040] By assembling the channel assembly 7 at the bottom of the correspondingly connected jet fan 5 inside the fixing frame 63, a higher air flow rate can be obtained in the process of guiding the air flow through the first vertical shaft 2 in the negative pressure area, thereby supplementing or increasing the wind speed discharged outward.

[0041] It should be noted that, referring to the Technical Specifications for Highway Engineering Construction Safety JTG F90-2015:

[0042] S1, the ventilation volume Q required by the maximum number of people working simultaneously in tunnel 1 人 In general areas, each person supplies 3.0m per minute 3 / min of fresh air (calculated based on 100 people in the tunnel, 300m / min 3 );

[0043] S2, according to the ventilation volume Q0 required to dilute carbon monoxide (CO) to the maximum permitted concentration after blasting, each kilogram of explosives can produce 40L of carbon monoxide gas after blasting (the blasting in tunnel 1 is based on the maximum 200kg of explosives, producing 8m 3 carbon monoxide);

[0044] S3, the ventilation volume Q required to dilute the harmful gases generated by the internal combustion machinery operating simultaneously in tunnel 1 to the allowable concentration 内 When diesel engines are used in the tunnel, the power can be increased by 4.5 m / min per kilowatt. 3 Air volume calculation (in tunnel 1, based on 3 PC300 excavators) + 3 PC60 excavators + 5 slag trucks + 4 tank trucks, (3×187+3×41+5×210+4×132)×0.8=1809.6, the harmful gas discharge per minute is 1809.6m 3 );

[0045] S4, ventilation volume Q required to meet the minimum wind speed (minimum wind speed for dust removal) 风 : The air velocity in the full-section excavation should not be less than 0.15m / s, and in the tunnel of the partial excavation should not be less than 0.25m / s, but should not be greater than 6m / s (the air volume per minute is 0.15×180×60=1620m 3 );

[0046] S5, total ventilation volume calculation: Q 总 =max(Q 人 ,Q0,Q 内 ,Q 风 ) Here "max" means taking the maximum value, conclusion: Q 总 =1809.6m 3 / min;

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

[0048] According to the maximum wind volume 1809.6m 3 / min, 37kw jet fan 5 air volume per minute is 34.8×60=2088m 3 , a 37kw jet fan 5 is configured on site, and the air volume can meet the on-site construction requirements;

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

[0050] Calculated based on the net cross-sectional area (A) of tunnel 1, the expected wind speed (V) and the number of ventilation times (n),

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

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

[0053] S8, in summary, the site adopts a mixed ventilation mode of shaft supply and exhaust + jet fan, with the second shaft 3 on both sides as the natural air shaft, the first shaft 2 as the exhaust shaft, and a 37kw jet fan 5 is configured to form a local negative pressure area to 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 speed in the tunnel;

[0054] S9, working environment air quality detection:

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

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

[0057] In mixed ventilation mode, the blasting operation decreased by 45% after 15 minutes and by 75% after 30 minutes;

[0058] In conventional ventilation mode, the blasting operation dropped by 18% after 15 minutes and by 30% after 30 minutes.

[0059] In one embodiment, the channel assembly 7 comprises:

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

[0061] There are multiple variable diameter spiral channels 72 that are evenly arranged along the circumference of the column 71 and are used to shrink the air flow channel and increase the air rising power;

[0062] The diffuser 73 is arranged on the top surface of the column 71 and is connected with the discharge outlets of the multiple intersecting variable diameter spiral channels 72, and is used to concentrate and accelerate the flow rate of air after the variable diameter spiral channels 72. In this design, the column 71 connected with the jet fan 5 is installed at the lower part of the inner support frame 61, wherein several variable diameter spiral channels 72 evenly distributed along the circumference of the column 71 are machined inside and outside the column 71 and the diffuser 73 where the top discharge outlets of several variable diameter spiral channels 72 intersect and communicate, so that the air guided by the axial flow fan 4 and the jet fan 5 can enter through the lower inlet of the variable diameter spiral channel 72, and the air flow rate is increased through the special structure of the variable diameter spiral channel 72, which effectively concentrates the flow direction of the air.

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

[0064] The outer spiral shape structure on the variable diameter spiral channel 72 can increase the air flow rate by bending and guiding the air flow direction;

[0065] The diffuser 73 connected to the upper end of the variable diameter spiral passage 72 and the diffuser 73 used after the variable diameter spiral passage 72 further concentrate and accelerate the air flow rate.

[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 frame 62. With this design, by using the annular cleaning block 8 that is rotatably connected to the inner bottom surface of the outer mounting frame 62 using an annular guide rail, the outer surface of the column 71 can be cleaned of dust by using the inner surface of the annular cleaning block 8 that contacts the cleaning surface of the column 71.

[0067] In one embodiment, the column 71 is provided with a liquid inlet channel 9 communicating with the inside of the diffuser 73, the liquid inlet channel 9 is openly provided with a delivery pipe 91 fixed to the outer surface of the column 71, and the delivery pipe 91 is openly provided with a pump body 92 at one end away from the column 71;

[0068] The pump body 92 is arranged on the outer bottom surface of the outer mounting frame 62. In this design, the liquid inlet channel 9 connected to the diffuser 73 is machined in the column 71, and the delivery pipe 91 and the pump body 92 are plugged and assembled at the outer end opening of the liquid inlet channel 9, and the power of the pump body 92 is used to deliver the cleaning liquid or water through the delivery pipe 91 and the liquid inlet channel 9 to the diffuser 73, and then flow to the lower end opening of the variable diameter spiral channel 72 along with the upper end opening of the plurality of variable diameter spiral channels 72, so as to achieve the effect of cleaning the inside of the variable diameter spiral channel 72.

[0069] It should be noted that the pump body 92 is fixed to the outer bottom surface of the outer mounting frame 62 by bolts, which provides convenience for maintenance and inspection.

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

[0071] In one embodiment, the inner bottom surface of the outer mounting frame 62 is provided with a water collecting tank 10;

[0072] The water collecting tank 10 is arranged in the wrapped area of ​​the fixing frame 63 and outside the channel assembly 7. With this design, the water collecting tank 10 is grooved by turning the grooves on the inner bottom surface of the outer mounting frame 62 and around the channel assembly 7, so that the waste liquid or waste water after cleaning flowing out of the lower end of the variable diameter spiral channel 72 can be collected, and the effect of temporary storage and collection can be achieved.

[0073] In one embodiment, a screw rod 11 matched with the column 71 is provided in a place in the water collection tank 10, and a gear 111 is provided on the screw rod 11, and the horizontal surface of the gear 111 meshes with an outer gear ring 112 fixed to the circumference of the annular cleaning block 8. With this design, a screw rod 11 is rotatably connected in a place in the water collection tank 10, and the upper end thread of the screw rod 11 is rotatably matched with the support block welded on the upper side of the column 71, wherein the lower end of the screw rod 11 extends to the outside through the bottom surface of the water collection tank 10, and the outer end of the screw rod 11 is operated to drive the column 71 connected to the support block with which the thread is rotatably matched to move in the vertical direction, and the column 71 can be moved down to perform regular maintenance on the structure of the column 71.

[0074] By also providing a fixed gear 111 on the screw rod 11 and an outer gear ring 112 provided on the outer periphery of the annular cleaning block 8 and meshing with the gear 111 on the horizontal plane, the gear 111 can be driven to rotate under the rotation of the screw rod 11, so that the outer gear ring 112 meshing with the gear 111 rotates, and then the annular cleaning block 8 is driven to rotate, so that the outer surface of the column 71 can be cleaned by 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 evenly provided with a plurality of vertical guide pieces 611 for guiding and limiting the channel assembly 7. In this design, the plurality of evenly distributed vertical guide pieces 611 welded at the lower end of the inner support frame 61 can guide and limit the column 71 formed on the channel assembly 7 in the vertical direction, thereby assisting in realizing the linear motion of the column 71 in the vertical direction.

[0076] In one embodiment, the water collection tank 10 is detachably provided with a block 12 for closing the water collection tank 10. With this design, the water collection tank 10 can be closed to collect the waste liquid or waste water after cleaning, and the water collection tank 10 can also be opened to centrally drain the waste liquid or waste water.

[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. In this way, the coaxial design of the above structure can ensure that the air flow path will not deviate, and the installation positioning is accurate and the operation is convenient.

[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 present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.

Claims

1. A hybrid ventilation device for use in subway tunnel construction, comprising a first vertical shaft (2) excavated and constructed on a tunnel (1), and second vertical shafts (3) for exhausting air are constructed on the tunnel (1) on both sides of the first vertical shaft (2), characterized in that: The tunnel (1) is provided with a plurality of axial flow fans (4) distributed between the first vertical shaft (2) and the second vertical shaft (3), the first vertical shaft (2) is provided with a jet fan (5), and a negative pressure zone is provided at the lower air inlet of the jet fan (5); A support assembly (6) comprising an inner support frame (61) arranged outside the jet fan (5), an outer mounting frame (62) arranged outside the inner support frame (61) at intervals, and a fixing frame (63) arranged on the inner bottom surface of the outer mounting frame (62) and connected to the wellhead below the first vertical shaft (2), and used to fix the jet fan (5) in the negative pressure area; A channel assembly (7) is arranged inside the fixing frame (63) and is connected to the bottom of the jet fan (5) fixed inside the inner support frame (61), and is used to accelerate and increase the flow rate of air discharged outward from the negative pressure zone.

2. A hybrid ventilation device for construction in a subway tunnel according to claim 1, characterized in that: The channel assembly (7) comprises: A column (71) is arranged at the lower part of the inner support frame (61) and is connected to the bottom of the jet fan (5); A plurality of variable diameter spiral channels (72) are evenly arranged along the circumference of the column (71) and are used to shrink the air flow channel and increase the rising power of the air; A diffuser (73) is arranged on the top surface of the column (71) and is connected to the discharge ports of the plurality of intersecting variable diameter spiral channels (72), and is used to concentrate and accelerate the flow rate of air after the variable diameter spiral channels (72).

3. A hybrid ventilation device for construction in a subway tunnel according to claim 2, characterized in that: The lower part of the column (71) is provided with an annular cleaning block (8) which rotates on the inner bottom surface of the outer mounting frame (62).

4. A hybrid ventilation device for construction in a subway tunnel according to claim 2, characterized in that: The column (71) is provided with a liquid inlet channel (9) in communication with the interior of the diffuser (73); the liquid inlet channel (9) is open to the outside and is provided with a delivery pipe (91) fixed to the outer surface of the column (71); and a pump body (92) is open to one end of the delivery pipe (91) away from the column (71); The pump body (92) is arranged on the outer bottom surface of the outer mounting frame (62).

5. A hybrid ventilation device for construction in a subway tunnel according to claim 3, characterized in that: The inner bottom surface of the outer mounting frame (62) is provided with a water collecting tank (10); The water collecting tank (10) is arranged in a wrapped area within the fixing frame (63) and outside the channel assembly (7).

6. A hybrid ventilation device for construction in a subway tunnel according to claim 5, characterized in that: A screw rod (11) matched with the column (71) is arranged in one place in the water collecting tank (10), a gear (111) is arranged on the screw rod (11), and the horizontal surface of the gear (111) is meshed with an outer gear ring (112) fixed on the circumference of the annular cleaning block (8).

7. A hybrid ventilation device for construction in a subway tunnel according to claim 1, characterized in that: A plurality of vertical guide plates (611) for guiding and limiting the channel assembly (7) are evenly arranged at the lower end of the inner support frame (61).

8. The hybrid ventilation device for construction in a subway tunnel according to claim 5, characterized in that: The water collecting tank (10) is detachably provided with a blocking block (12) for closing the water collecting tank (10).

9. A hybrid ventilation device for construction in a subway tunnel according to claim 2, characterized in that: 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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