Shield construction circulating ventilation system and shield machine

Abstract

The utility model discloses a kind of shield construction circulation ventilation system and shield machine, wherein, shield construction circulation ventilation system includes the air intake device for introducing fresh air into shield tunnel, the air supply device for cooling the air transported by the air intake device and transporting the air after cooling to construction area, the reverse circulation device for extracting construction area gas and filtering gas, and the three-way air pipe for guiding the fresh air introduced by the air intake device into the air supply device and guiding the airflow after filtering by the reverse circulation device into the air supply device, the air of reverse circulation device is extracted from the outlet of three-way air pipe into air supply device, the air extracted by reverse circulation device can exchange heat with the fresh air pressed from outside, so as to reduce the temperature of airflow into air supply device, can reduce the energy consumption of air supply device for cooling fresh air, it is simple in structure, energy-efficient.

Description

Technical Field

[0001] This utility model relates to the field of tunnel boring machine (TBM) construction technology, and in particular, to a circulating ventilation system for TBM construction. Furthermore, this utility model also relates to a TBM machine including the aforementioned circulating ventilation system. Background Technology

[0002] Shield tunneling is widely used in underground projects such as underwater highway tunnels, subway tunnels, municipal pipeline tunnels, and drainage tunnels due to its economic efficiency and effectiveness. During the tunneling process, the shield machine and segment assembly area generate a large amount of heat and polluted air. Because the tunnel space is confined and poorly ventilated, coupled with the inherently humid underground environment, this creates a hot, humid, and polluted working environment, seriously affecting the health of construction workers. Therefore, ventilation and cooling measures are necessary to improve air quality in the working area to ensure the safety and efficiency of shield tunneling.

[0003] Existing shield tunneling construction uses forced-air ventilation, where fresh air from outside the tunnel is forced into the tunnel by a primary air fan, then cooled by refrigeration equipment before being delivered to the construction area. In high-temperature weather (when the maximum temperature reaches or exceeds 35℃), the temperature of the fresh air forced into the tunnel is above 35℃, and the temperature of the air delivered to the construction area after cooling by the refrigeration equipment is only around 20℃, resulting in high energy consumption for the refrigeration equipment. Utility Model Content

[0004] This invention provides a circulating ventilation system for shield tunneling to solve the technical problem of high energy consumption in existing forced tunnel ventilation systems during high-temperature construction.

[0005] According to one aspect of the present invention, a circulating ventilation system for shield tunneling is provided, comprising an air intake device for introducing fresh air into the shield tunnel, an air supply device for cooling the air supplied by the air intake device and supplying the cooled air to the construction area, a reverse circulation device for extracting gas from the construction area and filtering the gas, and a three-ventilation duct for introducing the fresh air introduced by the air intake device into the air supply device and introducing the air filtered by the reverse circulation device into the air supply device.

[0006] Furthermore, the air intake device includes an air storage cylinder for connecting the primary air fan and the three ventilation ducts and moving with the tunnel boring machine. The air storage cylinder includes a cylinder body, a flexible air pipe housed in the cylinder body, an air guide ring for connecting the flexible air pipe and the primary air fan, and a relay air pipe for connecting the three ventilation ducts. A preset distance is left between the relay air pipe and the air outlet of the cylinder body.

[0007] Furthermore, the air storage duct also includes a first support frame for supporting the duct body and a second support frame for supporting the relay air duct. The duct body and the first support frame and / or the relay air duct and the second support frame are movably connected by a linear moving mechanism, which is arranged along the axial direction of the duct body.

[0008] Furthermore, the linear motion mechanism includes a slide rail arranged on the first support frame, a slider slidably connected to the slide rail, and a locking member for limiting the relative position of the slide rail and the slider. The slide rail is arranged along the axial direction of the cylinder, and the slider is connected to the cylinder.

[0009] Furthermore, the preset distance between the relay air duct and the air outlet of the cylinder is 100-200mm.

[0010] Furthermore, the air supply device includes a secondary air duct for directing airflow to the construction area, a secondary fan for connecting the three-way air duct and the secondary air duct, and a refrigeration device for cooling the airflow in the secondary air duct. A first wind pressure sensor for monitoring wind pressure is installed at the connection between the three-way air duct and the secondary fan.

[0011] Furthermore, the reverse circulation device includes a reverse circulation duct for introducing gas from the construction area into the three ventilation ducts, a reverse circulation fan installed on the reverse circulation duct, and an air filter for filtering the airflow in the reverse circulation duct.

[0012] Furthermore, the air filter includes a filter chamber, a filter element disposed in the filter chamber, a conical collection chamber connected to the bottom end of the filter chamber, a vibration motor disposed on the conical collection chamber, and a discharge gate disposed at the bottom end of the conical collection chamber. The air inlet of the filter chamber is lower than the air outlet of the filter chamber.

[0013] Furthermore, the air filter is equipped with a second air pressure sensor for monitoring air pressure at both the air inlet and the air outlet.

[0014] According to another aspect of the present invention, a tunnel boring machine is also provided, including the above-mentioned tunnel boring machine construction circulating ventilation system, wherein the tunnel boring machine further includes a temperature sensor for being installed in the construction area and / or at the air inlet of the anti-circulation device.

[0015] This utility model has the following beneficial effects:

[0016] This utility model discloses a circulating ventilation system for tunnel boring machine (TBM) construction. One end of the air inlet device is connected to the primary air fan at the tunnel entrance, and the other end is connected to the first inlet of a three-ventilation duct. The second inlet of the three-ventilation duct is connected to a reverse circulation device, and the outlet of the three-ventilation duct is connected to a supply air device. Fresh air forced into the tunnel by the primary air fan enters the supply air device along the air inlet device. The supply air device cools the fresh air and forces the cooled air into the TBM's construction area. The cooled air exchanges heat with the equipment and air gathered in the TBM's construction area, thereby reducing the temperature in the TBM's construction area. The reverse circulation device then draws air from the TBM's construction area... The air extracted from the tunnel boring machine's construction area by the reverse circulation device is at a temperature of 24-27℃. The extracted air is filtered and introduced into the second inlet of the three ventilation ducts. Then, it enters the air supply device from the outlet of the three ventilation ducts. The air extracted by the reverse circulation device can exchange heat with the fresh air compressed from the outside (when construction is carried out in hot weather, the temperature of the fresh air compressed from the outside into the tunnel is above 35℃), thereby reducing the temperature of the airflow entering the air supply device. This reduces the energy consumption of the air supply device in cooling the fresh air. Its structure is simple and can make full use of the residual cold air in the tunnel for recycling, making it energy-saving and efficient.

[0017] In addition to the objectives, features, and advantages described above, this utility model has other objectives, features, and advantages. The present utility model will now be described in further detail with reference to the figures. Attached Figure Description

[0018] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0019] Figure 1 This is a schematic diagram of the structure of the circulating ventilation system for tunnel boring machine construction according to a preferred embodiment of the present invention;

[0020] Figure 2 This is a schematic diagram of the structure of the air storage duct according to a preferred embodiment of the present invention;

[0021] Figure 3 This is a cross-sectional view of the air storage duct of a preferred embodiment of the present invention;

[0022] Figure 4 This is a schematic diagram of the structure of the first support frame according to a preferred embodiment of the present invention;

[0023] Figure 5 This is a schematic diagram of the linear motion mechanism according to a preferred embodiment of the present invention;

[0024] Figure 6 This is a schematic diagram of the structure of an air filter according to a preferred embodiment of the present invention.

[0025] Legend:

[0026] 100. Primary air fan; 200. Tunnel boring machine; 300. Tunnel; 1. Air intake device; 11. Cylinder; 111. Connecting seat; 112. First reinforcing rib; 113. Second reinforcing rib; 12. Flexible air pipe; 13. Air guide ring; 14. Relay air pipe; 15. First support frame; 16. Second support frame; 17. Linear movement mechanism; 171. Slide rail; 172. Slider; 173. Locking element; 2. Air supply device; 21. Secondary air duct; 22. Secondary fan; 23. Refrigeration equipment; 24. First air pressure sensor; 3. Reverse circulation device; 31. Reverse circulation air duct; 32. Reverse circulation fan; 33. Air filter; 331. Filter chamber; 332. Filter element; 333. Conical collection chamber; 334. Vibration motor; 335. Unloading gate; 336. Receiving trolley; 34. Second air pressure sensor; 35. Temperature sensor; 4. Three-way air duct. Detailed Implementation

[0027] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered below.

[0028] Please refer to the following: Figures 1 to 6 The shield tunneling circulating ventilation system of this embodiment includes an air intake device 1 for introducing fresh air into the shield tunnel, an air supply device 2 for cooling the air supplied by the air intake device 1 and supplying the cooled air to the construction area, a reverse circulation device 3 for extracting gas from the construction area and filtering the gas, and a three-ventilation duct 4 for introducing the fresh air introduced by the air intake device 1 into the air supply device 2 and introducing the air filtered by the reverse circulation device 3 into the air supply device 2.

[0029] In this embodiment of the shield tunneling circulating ventilation system, one end of the air inlet device 1 is connected to the primary air fan 100 at the tunnel entrance, and the other end is connected to the first inlet of the three-ventilation duct 4. The second inlet of the three-ventilation duct 4 is connected to the reverse circulation device 3, and the outlet of the three-ventilation duct 4 is connected to the air supply device 2. Fresh air forced into the tunnel 300 by the primary air fan 100 enters the air supply device 2 along the air inlet device 1. The air supply device 2 cools the fresh air and forces the cooled air into the construction area of ​​the shield machine 200. The cooled air exchanges heat with the equipment and air gathered in the construction area of ​​the shield machine 200, thereby reducing the temperature in the construction area of ​​the shield machine 200. The reverse circulation device 3 then forces the shield machine 200 to enter the tunnel 300. Air is extracted from the construction area (the air temperature extracted from the tunnel boring machine 200 construction area by the reverse circulation device 3 is 24-27℃) and filtered. The filtered air is introduced into the second inlet of the three ventilation duct 4, and then enters the air supply device 2 from the outlet of the three ventilation duct 4. The air extracted by the reverse circulation device 3 can exchange heat with the fresh air compressed from the outside (the temperature of the fresh air compressed into the tunnel from outside during high-temperature construction is above 35℃), thereby reducing the temperature of the airflow entering the air supply device 2. This reduces the energy consumption of the air supply device 2 in cooling the fresh air. Its structure is simple and can make full use of the residual cold air in the tunnel 300 for recycling, making it energy-efficient. Optionally, the inner diameter D2 of the second inlet on the three ventilation duct 4 is smaller than the inner diameter D1 of the first inlet, ensuring that the air flow rate compressed by the air supply device 2 is greater than the air flow rate extracted by the reverse circulation device 3. This forms an airflow from the tunnel boring machine 200 construction area to the tunnel entrance, thereby improving the air quality throughout the tunnel 300. Optionally, D1 = 2D2.

[0030] like Figure 1 , Figure 2 and Figure 3As shown, in this embodiment, the air intake device 1 includes an air storage cylinder for connecting the primary air fan 100 and the three-way ventilation duct 4 and moving with the tunnel boring machine. The air storage cylinder includes a cylinder body 11, a flexible air pipe 12 housed within the cylinder body 11, an air guide ring 13 for connecting the flexible air pipe 12 to the primary air fan 100, and a relay air pipe 14 for connecting the three-way ventilation duct 4. A preset distance W is left between the relay air pipe 14 and the air outlet of the cylinder body 11. The flexible air pipe 12 is housed within the cylinder body 11, with one end of the flexible air pipe 12 connected to the cylinder body 11 and the other end connected to the air guide ring 13. The air guide ring 13 is connected to the primary air fan 100. When the tunnel boring machine 200 advances forward, The flexible air tube 12 can be deployed to ensure that the primary air fan 100 can smoothly compress fresh air into the air supply device 2. A preset distance W is left between the relay air duct 14 and the air outlet of the cylinder 11. On the one hand, when the air supply device 2 starts or increases its speed, the air in the tunnel 300 can enter the first inlet of the three-way ventilation duct 4 through the preset distance W, preventing vacuum suction that could cause the primary air fan 100 to surge or the flexible air tube 12 to collapse and cause equipment damage, thus ensuring the normal progress of the tunnel boring machine. On the other hand, a small amount of fresh air can leak out from the preset distance W, thereby forming an airflow from the air outlet of the cylinder 11 to the tunnel entrance, thereby improving the air quality in the entire tunnel 300. Optionally, the deployed length of the flexible air tube 12 is 200m.

[0031] like Figure 3 and Figure 4 As shown, in this embodiment, the air storage duct further includes a first support frame 15 for supporting the cylinder body 11 and a second support frame 16 for supporting the relay air duct 14. The cylinder body 11 and the first support frame 15 and / or the relay air duct 14 and the second support frame 16 are movably connected by a linear moving mechanism 17, which is arranged along the axial direction of the cylinder body 11. The relative position of the relay air duct 14 and the cylinder body 11 is adjusted by the linear moving mechanism 17 to adjust the preset distance W. Optionally, a connecting seat 111 for connecting the support structure is provided on the cylinder body 11. Optionally, first reinforcing ribs 112 arranged axially are provided on the outer circumferential surface of the cylinder body 11. Multiple first reinforcing ribs 112 are arranged at intervals along the circumference of the cylinder body 11 to enhance the rigidity of the cylinder body 11 and prevent deformation of the cylinder body 11. Optionally, a second reinforcing rib 113 is provided on the outer circumferential surface of the cylinder 11, and multiple second reinforcing ribs 113 are arranged at intervals along the axial direction of the cylinder 11 to enhance the rigidity of the cylinder 11 and prevent the cylinder 11 from deforming.

[0032] like Figure 4 and Figure 5As shown, in this embodiment, the linear movement mechanism 17 includes a slide rail 171 arranged on the first support frame 15, a slider 172 slidably connected to the slide rail 171, and a locking member 173 for limiting the relative position of the slide rail 171 and the slider 172. The slide rail 171 is arranged along the axial direction of the cylinder 11, and the slider 172 is connected to the connecting seat 111 on the cylinder 11. Loosening the locking member 173 adjusts the relative position of the slider 172 and the slide rail 171. When the slider 172 moves to the designated position, the locking member 173 limits the relative position of the slide rail 171 and the slider 172. Its structure is simple, operation is convenient, and the preset distance W can be adjusted according to usage requirements. It can be understood that if the slide rail 171 is arranged on the second support frame 16 and the slider 172 is connected to the relay air duct 14, the preset distance W can also be adjusted. Optionally, the locking member 173 is a screw, bolt, or pin.

[0033] like Figure 3 As shown, in this embodiment, the preset distance W between the relay air duct 14 and the air outlet of the cylinder 11 is 100-200mm. When the preset distance W is less than 100mm, the airflow from the preset distance W into the first inlet of the three-way ventilation duct 4 in the tunnel 300 is too small. When the speed of the secondary fan 22 increases significantly, it will still cause the primary fan 100 to surge and the flexible air duct 12 to collapse, resulting in equipment damage. When the preset distance W is greater than 200mm, a large amount of fresh air will leak from the air outlet of the cylinder 11 through the preset distance W (without entering the air supply device 2 for cooling). During construction in hot weather, this will cause the temperature inside the tunnel 300 to rise. Optionally, the preset distance W is 150mm.

[0034] like Figure 1 As shown, in this embodiment, the air supply device 2 includes a secondary air duct 21 for guiding airflow to the construction area, a secondary fan 22 for connecting the primary air duct 4 and the secondary air duct 21, and a cooling device 23 for cooling the airflow in the secondary air duct 21. A first wind pressure sensor 24 for monitoring wind pressure is installed at the connection between the primary air duct 4 and the secondary fan 22. The secondary fan 22 is connected to the outlet of the primary air duct 4, and pressurizes the airflow guided from the primary air duct 4 into the construction area of ​​the tunnel boring machine 200. The cooling device 23 cools the airflow in the secondary air duct 21. The operators can adjust the frequency of the primary fan 100 by the pressure value fed back by the first wind pressure sensor 24 to ensure the smooth progress of the tunnel boring machine construction.

[0035] like Figure 1As shown, in this embodiment, the reverse circulation device 3 includes a reverse circulation duct 31 for introducing gas from the tunnel boring machine 200 construction area into the three-ventilation duct 4, a reverse circulation fan 32 installed on the reverse circulation duct 31, and an air filter 33 for filtering the airflow in the reverse circulation duct 31. When the reverse circulation fan 32 is started, the gas in the tunnel boring machine 200 construction area is extracted, and the gas filtered by the air filter 33 re-enters the air supply device 2 through the second inlet of the three-ventilation duct 4, which can realize the recycling of cold air in the tunnel 300, thereby reducing the energy consumption of the refrigeration equipment 23. Optionally, a one-way damper is installed on the reverse circulation fan 32 to prevent fresh air entering the three-ventilation duct 4 from escaping from the reverse circulation duct 31 into the tunnel boring machine 200 construction area, thus avoiding affecting the tunnel construction environment.

[0036] like Figure 1 As shown, in this embodiment, the air filter 33 is equipped with a second air pressure sensor 34 for monitoring air pressure at the air inlet and air outlet, which can determine whether the air filter is blocked by the pressure difference between the front and rear ends of the air filter 33.

[0037] like Figure 6 As shown, in this embodiment, the air filter 33 includes a filter chamber 331, a filter element 332 disposed in the filter chamber 331, a conical collection chamber 333 connected to the bottom end of the filter chamber 331, a vibration motor 334 disposed on the conical collection chamber 333, and a discharge door 335 disposed on the bottom end of the conical collection chamber 333. The air inlet of the filter chamber 331 is lower than the air outlet of the filter chamber 331. Since the air inlet of the filter chamber 331 is located at a lower position, the airflow direction in the filter chamber 331 is from bottom to top. Impurities adhere to the bottom and side surfaces of the filter element 332. Due to gravity, the impurities fall freely into the conical collection chamber 333. The vibration motor 334 causes the impurities on the conical collection chamber 333 to gather to the bottom. When the reverse circulation device 3 stops working, the discharge door 335 can be opened to discharge the impurities. Its structure is reasonable and can reduce the difficulty of the filter element 332. Optionally, the air filter 33 also includes a receiving cart 336 for receiving the discharge from the unloading gate 335. Optionally, the filter chamber 331 or the conical collection chamber 333 is provided with an inspection door to facilitate the cleaning and replacement of the filter element 332.

[0038] In this embodiment, a second air pressure sensor 34 for monitoring air pressure is respectively installed on the air inlet and air outlet of the filter chamber 331, which can determine whether the filter element 332 is blocked by the pressure difference between the front and rear ends of the air filter 33.

[0039] A tunnel boring machine (TBM) includes the aforementioned circulating ventilation system for TBM construction. The TBM 200 also includes a temperature sensor 35 installed in the construction area and / or at the air inlet of the reverse circulation device 3. The primary air fan 100, secondary air fan 22, cooling equipment 23, first air pressure sensor 24, reverse circulation fan 32, second air pressure sensor 34, and temperature sensor 35 are electrically connected to the TBM 200 operator's cab. The temperature sensor 35 can collect the ambient temperature of the construction area of ​​the TBM 200. The TBM operator can control the start and stop of the reverse circulation fan 32 based on the feedback value from the temperature sensor 35. Beforehand, parameters are set in the control room of the tunnel boring machine 200 (allowable pressure difference values ​​of the two second air pressure sensors 34 before and after the air filter 33, and the allowable start-up temperature of the reverse circulation fan 32). In manual mode, the tunnel boring machine operator slowly adjusts the frequency of the primary air fan 100. When the first air pressure sensor 24 detects an air pressure greater than 0 bar, the secondary air fan 22 is started. Because a 150mm gap is reserved between the secondary air duct 21 and the relay air duct 14, even if the air pressure at the connection between the tertiary ventilation duct 4 and the secondary air fan 22 is less than 0 bar for a short time after the secondary air fan 22 is started, the soft air tube 12 can be prevented from collapsing. To mitigate risks, the tunnel boring machine (TBM) operator continuously adjusts the frequency of the primary air fan 100 to ensure the first air pressure sensor 24 remains positive. At this point, the cooling equipment 23 is activated to maintain stable wind speed and temperature in the TBM 200's working area. After 30 minutes of operation, the system switches to automatic mode, and the reverse circulation fan 32 automatically starts, promptly drawing the cool air from the TBM 200's working area back to the intake of the secondary air fan 22. Simultaneously, the primary air fan 100 automatically reduces its operating frequency until the pressure monitored by the first air pressure sensor 24 is between 0-500 bar (static pressure), at which point the primary air fan 100's frequency is maintained at a stable level. The system maintains a constant temperature, thus enabling the recycling of cool air within the tunnel 300 and reducing the power consumption of the refrigeration equipment 23. The secondary air duct 21 and the reverse circulation air duct 31 can be arranged side by side or on the left and right sides of each vehicle, making the pipeline layout simple and flexible. The primary air fan 100 can automatically adjust its frequency, achieving energy efficiency. The air filter 33 can filter the polluted air in the construction area of ​​the tunnel boring machine 200 and also has a differential pressure alarm function. By presetting the differential pressure values ​​of the two second air pressure sensors 34 before and after the air filter 33, the reverse circulation fan 32 will automatically shut down when the air filter 33 becomes clogged, reminding the operators to replace and clean the filter element 332.

[0040] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A circulating ventilation system for shield tunneling construction, characterized in that, It includes an air intake device (1) for introducing fresh air into the shield tunnel, an air supply device (2) for cooling the air supplied by the air intake device (1) and supplying the cooled air to the construction area, a reverse circulation device (3) for extracting gas from the construction area and filtering the gas, and a three-way ventilation duct (4) for introducing the fresh air introduced by the air intake device (1) into the air supply device (2) and introducing the air filtered by the reverse circulation device (3) into the air supply device (2).

2. The shield tunneling circulating ventilation system according to claim 1, characterized in that, The air intake device (1) includes an air storage cylinder for connecting the primary air fan and the three ventilation ducts (4) and moving with the tunnel boring machine. The air storage cylinder includes a cylinder body (11), a flexible air pipe (12) housed in the cylinder body (11), an air guide ring (13) for connecting the flexible air pipe (12) and the primary air fan, and a relay air pipe (14) for connecting the three ventilation ducts (4). A preset distance is left between the relay air pipe (14) and the air outlet of the cylinder body (11).

3. The shield tunneling circulating ventilation system according to claim 2, characterized in that, The air storage duct also includes a first support frame (15) for supporting the duct body (11) and a second support frame (16) for supporting the relay air duct (14). The duct body (11) and the first support frame (15) and / or the relay air duct (14) and the second support frame (16) are movably connected by a linear moving mechanism (17), which is arranged along the axial direction of the duct body (11).

4. The shield tunneling circulating ventilation system according to claim 3, characterized in that, The linear motion mechanism (17) includes a slide rail (171) arranged on the first support frame (15), a slider (172) slidably connected to the slide rail (171), and a locking member (173) for limiting the relative position of the slide rail (171) and the slider (172). The slide rail (171) is arranged along the axial direction of the cylinder (11), and the slider (172) is connected to the cylinder (11).

5. A shield construction circulation ventilation system according to any one of claims 2 to 4, characterised in that, The preset distance between the relay air duct (14) and the air outlet of the cylinder (11) is 100-200mm.

6. The shield tunneling circulating ventilation system according to claim 5, characterized in that, The air supply device (2) includes a secondary air duct (21) for directing airflow to the construction area, a secondary fan (22) for connecting the three-way air duct (4) and the secondary air duct (21), and a refrigeration device (23) for cooling the airflow in the secondary air duct (21). A first wind pressure sensor (24) for monitoring wind pressure is provided at the connection between the three-way air duct (4) and the secondary fan (22).

7. The shield tunneling circulating ventilation system according to claim 5, characterized in that, The reverse circulation device (3) includes a reverse circulation duct (31) for introducing gas from the construction area into the three ventilation ducts (4), a reverse circulation fan (32) installed on the reverse circulation duct (31), and an air filter (33) for filtering the airflow in the reverse circulation duct (31).

8. The shield tunneling circulating ventilation system according to claim 7, characterized in that, The air filter (33) includes a filter chamber (331), a filter element (332) arranged in the filter chamber (331), a conical collection chamber (333) connected to the bottom end of the filter chamber (331), a vibration motor (334) arranged on the conical collection chamber (333), and a discharge gate (335) arranged at the bottom end of the conical collection chamber (333). The air inlet of the filter chamber (331) is lower than the air outlet of the filter chamber (331) from the ground.

9. The shield tunneling circulating ventilation system according to claim 7 or 8, characterized in that, The air filter (33) is equipped with a second air pressure sensor (34) for monitoring air pressure at its air inlet and air outlet.

10. A tunneling machine characterized by, The shield tunneling machine includes a circulating ventilation system according to any one of claims 1 to 9, and the shield machine further includes a temperature sensor (35) for installation in the construction area and / or at the air inlet of the reverse circulation device (3).

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