Oxygen supply system and oxygen supply method for high-altitude tunnel construction

Abstract

The invention relates to the technical field of tunnel construction, and particularly discloses an oxygen supply system and an oxygen supply method for high-altitude tunnel construction. The device comprises an air curtain generating device, the air curtain generating device comprises a fan and an air curtain jet pipe and further comprises a movable adjusting support arranged below the fan and the air curtain jet pipe, an air inlet is formed in one end of the air curtain jet pipe, the fan is arranged at the air inlet of the air curtain jet pipe, and the fan and the air curtain jet pipe are matched to generate an air curtain. The air curtain divides the tunnel into an upper part and a lower part, an isolation area is arranged above the air curtain, a press-in type air pipe is arranged in the isolation area along the tunnel, an outlet of the press-in type air pipe is located near a tunnel face, a breathing area is arranged below the air curtain, an oxygen supply pipeline is arranged in the breathing area along the bottom of the tunnel, an outlet of the oxygen supply pipeline is located near the tunnel face, and an oxygen generator is arranged at an inlet of the oxygen supply pipeline. An air curtain generated by the air curtain generating device divides the tunnel into an isolation area located above the air curtain and a breathing area located below the air curtain, the oxygen supply effect is improved, the oxygen supply cost is reduced, poisonous and harmful gas, dust and the like can be discharged out of the tunnel through the isolation area along with fresh air flow pressed into the end of the press-in type air pipe, and the ventilation effect is improved. And the original press-in ventilation effect is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of tunnel construction, and in particular to an oxygen supply system and an oxygen supply method for high-altitude tunnel construction. Background Art

[0002] During tunnel construction in high-altitude areas, the low-pressure oxygen-deficient environment near the tunnel face will not only reduce the air intake of mechanical equipment and reduce the working efficiency of the equipment, but also expose tunnel construction personnel to severe physiological stress, threatening the safety of life and property of construction personnel. At present, my country's tunnel construction oxygen supply methods are mainly divided into individual oxygen supply, full oxygen-enriched oxygen supply and comprehensive oxygen supply. Individual oxygen supply is simple and efficient, but storage equipment such as oxygen cylinders is inconvenient to carry and needs to be replaced regularly, affecting work continuity; full oxygen supply does not affect construction, but the oxygen utilization rate is low and the cost is huge; although the comprehensive oxygen supply has little impact on construction and the cost is lower than the full oxygen-enriched oxygen supply mode, its oxygen supply efficiency is still not optimistic. Summary of the invention

[0003] The present invention provides an oxygen supply system and an oxygen supply method for high-altitude tunnel construction, which can overcome certain or some defects of the prior art.

[0004] According to the present invention, an oxygen supply system for high-altitude tunnel construction includes a wind curtain generating device, which includes a fan and a wind curtain jet tube, and also includes a movable adjustable bracket arranged below the fan and the wind curtain jet tube. An air inlet is formed at one end of the wind curtain jet tube, and the fan is arranged at the air inlet of the wind curtain jet tube. The fan and the wind curtain jet tube cooperate to generate a wind curtain, and the wind curtain divides the tunnel into two parts, an upper and lower part, an isolation zone is above the wind curtain, and a press-in air duct is arranged along the tunnel in the isolation zone, and the outlet of the press-in air duct is located near the heading face. Below the wind curtain is a breathing zone, and an oxygen supply pipeline is arranged along the bottom of the tunnel in the breathing zone, and the outlet of the oxygen supply pipeline is located near the heading face. An oxygen generator is provided at the inlet of the oxygen supply pipeline.

[0005] Through the present invention, when construction is carried out on the face, the adjustment bracket is moved to set the wind curtain generating device to a suitable position and adjust the angle, and the fan is started to generate airflow to blow into the wind curtain jet tube. The airflow is ejected outward through the wind curtain jet tube to form a uniform wind curtain. The oxygen generator supplies oxygen to the vicinity of the face through the oxygen supply pipeline, and at the same time, the end of the press-in air duct presses fresh airflow into the face. When the face is under construction, a large amount of smoke, dust, and harmful gases will be generated. The traditional treatment method is to discharge toxic and harmful gases, dust, etc. out of the cave through the fresh airflow pressed into the press-in air duct. At the same time, oxygen will also be discharged out of the cave along with toxic and harmful gases, dust, etc. under the action of the fresh airflow, thereby causing a waste of oxygen and resulting in low oxygen supply efficiency. Through the setting of the wind curtain generating device, the wind curtain it generates divides the tunnel into an isolation zone above the wind curtain and a breathing zone below the wind curtain. The wind curtain can cover the width of the entire breathing zone, and the height starts from a certain distance above the workers' heads. The oxygen output by the oxygen supply pipeline is enriched in the breathing zone below the wind curtain, which increases the effect of oxygen supply and reduces the cost of oxygen supply. Toxic and harmful gases, dust, etc. are discharged out of the cave through the isolation zone following the fresh air flow pressed in by the end of the forced-in air duct, which increases the original forced-in ventilation effect.

[0006] Preferably, a plurality of guide rings of different sizes are provided on the inner wall of the wind curtain jet tube, and an air passage is formed in the middle of the guide ring.

[0007] Through the present invention, when a wind curtain is needed, air flow is blown into the air inlet of the wind curtain jet tube to generate a wind curtain. The air flow changes its flow direction after passing through the guide ring, which can slow down the attenuation speed of the air flow in the pipeline and improve the effect of the wind curtain.

[0008] Preferably, the wind passage comprises a windward surface and a leeward surface of the guide ring, the windward surface of the guide ring is a convex arc surface, and the leeward surface is a plane, and the windward surface and the leeward surface cooperate to form a streamlined wind passage with a round head and a pointed tail.

[0009] Through the present invention, the windward surface and the leeward surface of the wind passage are designed to be streamlined, which reduces the speed loss of the airflow in the wind passage and further improves the wind curtain effect.

[0010] Preferably, the connection between the windward side and the leeward side of the guide ring is the minimum inner diameter of the wind passage, and a plurality of guide rings of different sizes are evenly arranged along the axial direction of the wind curtain jet tube, and the minimum inner diameter of the plurality of guide rings of different sizes gradually decreases from the air inlet of the wind curtain jet tube to the tail of the wind curtain jet tube, and the radius R at the minimum inner diameter of the wind passage is d Change Satisfaction , where R 0 is the radius of the wind curtain jet tube, k is the wind speed attenuation coefficient, and d is the distance from the fan.

[0011] Through the present invention, the minimum inner diameter of the guide ring gradually decreases along the axial direction of the wind curtain jet tube, and the design of the gradual inner diameter helps to change the airflow direction, thereby optimizing the airflow distribution; according to the wind speed attenuation coefficient k and the distance d from the fan, the gradual inner diameter can also slow down the rapid attenuation of the wind speed in the wind curtain jet tube and maintain the stability of the airflow; the flow formula is , where Q is the flow rate, r is the pipe radius, V is the wind speed at the pipe radius, and the wind speed attenuation formula, where d is the distance from the wind source, V d is the wind speed at a distance d from the wind source, V 0 is the initial wind speed, k is the wind speed attenuation coefficient, and the inner diameter R is derived d Change Satisfaction , based on mathematical formula calculations, ensures the accuracy of the design and helps achieve better air curtain performance.

[0012] Preferably, the wind curtain jet tube is a hollow cylinder with multiple air outlets evenly arranged on the side and the edges of the air outlets are rounded.

[0013] Through the present invention, the air outlets of the wind curtain jet tube are evenly distributed on its outer surface, and the aperture size and spacing are designed to facilitate the formation of a wind curtain with uniform width and height; the edges of the air outlets are rounded to ensure smooth output of the airflow, prevent turbulence, and further increase the stability of the wind curtain.

[0014] Preferably, the fan and the wind curtain jet pipe are threadedly connected, and a sealing ring is provided at the connection.

[0015] Through the present invention, the connection between the fan and the wind curtain jet tube is designed to be a threaded connection. The operator only needs to rotate the wind curtain jet tube or the fan to lock or loosen it, which reduces the installation and disassembly time of the fan and the wind curtain jet tube and facilitates the maintenance of the device. The connection between the fan and the wind curtain jet tube is sealed with an annular sealing ring. When the fan is connected to the wind curtain jet tube, the sealing ring can fit tightly to the connection to ensure that the airflow does not leak at the interface. In order to further enhance the sealing performance, the sealing ring material is selected from wear-resistant rubber, which can not only provide a good sealing effect, but also resist moisture and chemical corrosion in the tunnel.

[0016] Preferably, a clamp with bolts is provided between the wind curtain jet tube and the adjusting bracket, and the clamp with bolts is nested in the outside of the wind curtain jet tube and fixes the wind curtain jet tube to the top of the adjusting bracket.

[0017] Through the present invention, a bolt clamp is provided, which can be quickly fixed and loosened, which is convenient for installing and replacing the wind curtain jet tube and reduces the maintenance time; the provision of the bolt clamp also facilitates the angle adjustment of the wind curtain jet tube, which can be easily adjusted by loosening the bolts to adapt to protection in different directions; the bolt clamp can also provide a firm connection, increase the structural stability between the wind curtain jet tube and the adjustment bracket, and avoid structural loosening due to vibration and the like; the bolt clamp can adapt to wind curtain jet tubes of different sizes and shapes and has good versatility.

[0018] Preferably, the adjustment bracket includes adjustment rods vertically arranged respectively below the clamps, corresponding hollow support vertical rods vertically arranged below the adjustment rods, reinforcement cross rods arranged between the support vertical rods, a base arranged below the support vertical rods, and reinforcement diagonal braces arranged between the base and the support vertical rods.

[0019] Through the present invention, by arranging supporting vertical rods, reinforcing horizontal rods and reinforcing diagonal braces, the overall structure is more stable, can resist external vibrations and impacts, and maintain the stability of the wind curtain jet tube; the design of the hollow supporting vertical rods ensures the strength of the structure while reducing its own weight, facilitates transportation and reduces the manufacturing cost.

[0020] Preferably, each supporting vertical rod has a first through hole, the adjusting rod is provided with a plurality of second through holes with the same diameter as the first through holes, and fastening bolts passing through the first through holes and the second through holes are provided between the supporting vertical rod and the adjusting rod respectively.

[0021] Through the present invention, the cooperation of the first through hole and the plurality of second through holes allows the adjusting rod to be precisely adjusted in the vertical direction, and the height of the wind curtain jet tube can be adjusted by selecting different hole positions; the bolt connection provides a sturdy connection method, enhances the structural strength between the adjusting rod and the supporting vertical rod, and improves the stability of the entire adjusting bracket.

[0022] A high-altitude tunnel construction oxygen supply method, which is used to construct an oxygen supply system for high-altitude tunnel construction, comprises the following steps: Step S1: Under the condition of using a forced-in air duct for ventilation, an oxygen supply pipeline is laid at the bottom of the tunnel, wherein the oxygen outlet of the oxygen supply pipeline is located near the tunnel face, and the oxygen supply pipeline extends from the oxygen concentrator into the tunnel; Step S2: Connect the fan to the air curtain jet tube, and then install the air curtain jet tube and the fan on an adjustment bracket, and adjust the adjustment bracket so that the air curtain jet tube is located between the outlet of the oxygen supply pipeline and the outlet of the pressure-in air duct; Step S3: adjusting the wind curtain jet pipe so that the wind curtain it generates is parallel to the tunnel ground, turning on the wind curtain fan to generate airflow to blow into the wind curtain jet pipe, forming a wind curtain parallel to the ground; Step S4: The air curtain divides the inner space of the tunnel into a breathing zone and an isolation zone.

[0023] Through the present invention, the presence of the wind curtain divides the internal space of the tunnel into two areas: the area between the breathing surface of the workers in the breathing zone and the ground, and the area between the breathing surface of the workers in the isolation zone and the vault. After the wind curtain is opened, the wind curtain blocks the diffusion of oxygen to the isolation zone and seals most of it in the breathing zone, so that oxygen is enriched in the breathing zone where the workers are located, while the isolation zone above is relatively oxygen-free or has a low oxygen concentration. The dust and toxic and harmful gases generated by the construction of the face will be discharged out of the cave under the action of the fresh airflow of the forced-in air duct. The deployed wind curtain can form a protective effect, which will not affect the fresh airflow to discharge the dust and toxic and harmful gases generated by the face, and can also protect the oxygen in the oxygen supply pipeline to stay near the face to meet the oxygen needs of the construction workers. At the same time, the wind curtain will also increase the original forced-in ventilation effect and improve the efficiency of toxic and harmful gas and dust discharge. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the oxygen supply system for high altitude tunnel construction in Example 1; Figure 2 Schematic diagram of the wind curtain generating device in Example 1; Figure 3 Schematic diagram of the cross section of the air curtain jet tube in Example 1; Figure 4 Schematic diagram of the fan and air curtain jet pipe in Example 1; Figure 5 This is a schematic diagram of the adjustment bracket in Example 1; Figure 6 It is a schematic diagram of local A in Example 1; Figure 7 It is a schematic diagram of local B in Example 1; Figure 8 It is a schematic side view of the air curtain jet tube in Example 1; Fig. 9 Schematic diagram of wind speed inside the straight wind curtain jet tube in Example 1; Fig.10 Schematic diagram of the wind speed inside the wind curtain jet tube with a streamlined guide ring in Example 1; Fig.11 The ventilation is performed with or without wind curtain near the face in Example 2 for 10 min. 2 Schematic diagram of concentration comparison; Fig.12 Schematic diagram of the comparison of CO concentrations near the tunnel face with and without wind curtain ventilation for 10 minutes in Example 2; Fig.13 Schematic diagram of the flow field without wind curtain in the tunnel in Example 2; Fig.14 Schematic diagram of the flow field with wind curtain in the tunnel in Example 2. DETAILED DESCRIPTION

[0025] In order to further understand the content of the present invention, the present invention is described in detail in conjunction with the accompanying drawings and embodiments. It should be understood that the embodiments are only for explaining the present invention and are not intended to limit it.

[0026] Example 1 like Figure 1-14 As shown, this embodiment provides an oxygen supply system for high-altitude tunnel construction, which includes a wind curtain generating device 120, the wind curtain generating device 120 includes a fan 210 and a wind curtain jet pipe 220, and also includes a movable adjustable bracket 230 arranged below the fan 210 and the wind curtain jet pipe 220, an air inlet 330 is formed at one end of the wind curtain jet pipe 220, the fan 210 is arranged at the air inlet 330 of the wind curtain jet pipe 220, and the fan 210 and the wind curtain jet pipe 220 are matched. The wind curtain 110 is combined to generate a wind curtain 110, which divides the tunnel into two parts, an upper part and an lower part. Above the wind curtain 110 is an isolation zone 130, and a push-in air duct 160 is arranged along the tunnel in the isolation zone 130, and the outlet of the push-in air duct 160 is located near the tunnel face 150. Below the wind curtain 110 is a breathing zone 140, and an oxygen supply pipe 170 is arranged along the bottom of the tunnel in the breathing zone 140, and the outlet of the oxygen supply pipe 170 is located near the tunnel face 150, and an oxygen generator 180 is provided at the entrance of the oxygen supply pipe 170.

[0027] Through this embodiment, when the tunnel face 150 is under construction, the adjustment bracket 230 is moved to set the wind curtain generating device 120 to a suitable position and adjust the angle, and the fan 210 is started to generate airflow to blow into the wind curtain jet pipe 220, and the airflow is ejected outward through the wind curtain jet pipe 220 to form a uniform wind curtain 110. The oxygen generator 180 supplies oxygen to the vicinity of the tunnel face 150 through the oxygen supply pipeline 170, and at the same time, the end of the pressure-type air duct 160 presses fresh airflow into the tunnel face 150. When the tunnel face 150 is under construction, a large amount of smoke and harmful gases will be generated. The traditional treatment method is to discharge toxic and harmful gases, dust, etc. out of the cave through the fresh airflow pressed into the pressure-type air duct 160. At the same time, oxygen will also be discharged out of the cave along with toxic and harmful gases, dust, etc. under the action of the fresh airflow, thereby causing a waste of oxygen and resulting in low oxygen supply efficiency. By setting the wind curtain generating device 120, the wind curtain 110 generated by it divides the tunnel into an isolation zone 130 located above the wind curtain 110 and a breathing zone 140 below the wind curtain. The wind curtain 110 can cover the entire width of the breathing zone 140, and the height starts from a certain distance above the workers' heads. The oxygen output by the oxygen supply pipeline 170 is enriched in the breathing zone 140 below the wind curtain, which increases the effect of oxygen supply and reduces the cost of oxygen supply. Toxic and harmful gases, dust, etc. are discharged out of the cave through the isolation zone 130 following the fresh air flow pressed in by the end of the forced-in air duct 160, thereby increasing the original forced-in ventilation effect.

[0028] In this embodiment, a plurality of guide rings 310 of different sizes are disposed on the inner wall of the wind curtain jet tube 220 , and a wind passage 340 is formed in the middle of the guide ring 310 .

[0029] Through this embodiment, when the wind curtain 110 is needed, air flow is blown into the air inlet of the wind curtain jet tube 220 to generate the wind curtain 110. The air flow changes its flow direction after passing through the guide ring 310, which can slow down the attenuation speed of the air flow in the pipeline and improve the effect of the wind curtain 110.

[0030] In this embodiment, the wind passage 340 includes a windward surface 350 and a leeward surface 360 ​​of the guide ring. The windward surface 350 of the guide ring 310 is an outwardly convex arc surface, and the leeward surface 360 ​​is a plane. The windward surface 350 and the leeward surface 360 ​​cooperate to form a streamlined wind passage 340 with a round head and a pointed tail.

[0031] Through this embodiment, the windward surface 350 and the leeward surface 360 ​​of the wind passage 340 are designed to be streamlined, thereby reducing the speed loss of the airflow in the wind passage 340 and further improving the wind curtain effect.

[0032] In this embodiment, the connection between the windward surface 350 and the leeward surface 360 ​​of the guide ring 310 is the minimum inner diameter of the wind passage 340, and a plurality of guide rings 310 of different sizes are evenly arranged along the axial direction of the wind curtain jet tube 220, and the minimum inner diameters of the plurality of guide rings 310 of different sizes gradually decrease from the air inlet 330 of the wind curtain jet tube 220 to the tail of the wind curtain jet tube 220. The radius R at the minimum inner diameter of the wind passage 340 is d Change Satisfaction , where R 0 is the radius of the wind curtain jet tube 220, k is the wind speed attenuation coefficient, and d is the distance from the fan.

[0033] Through this embodiment, the minimum inner diameter of the guide ring 310 gradually decreases along the axial direction of the wind curtain jet tube 220. The design of the gradual inner diameter helps to change the airflow direction, thereby optimizing the airflow distribution; according to the wind speed attenuation coefficient k and the distance d from the fan, the gradual inner diameter can also slow down the rapid attenuation of the wind speed in the wind curtain jet tube 220 and maintain the stability of the airflow; the flow formula is , where Q is the flow rate, r is the pipe radius, V is the wind speed at the pipe radius, and the wind speed attenuation formula is , where d is the distance from the wind source, V d is the wind speed at a distance d from the wind source, V 0 is the initial wind speed, k is the wind speed attenuation coefficient, and the inner diameter R is derived d Change Satisfaction , based on mathematical formula calculations, ensures the accuracy of the design and helps achieve better air curtain performance. Figure 9-10As shown, the setting of guide rings 310 of different sizes optimizes the problem of rapid attenuation of air flow velocity in the linear wind curtain jet tube 220, slows down the wind speed attenuation, and can maintain a stable wind curtain 110 at a farther distance when the power of the fan is the same, thereby improving the isolation effect of the wind curtain 110 against harmful gases and dust.

[0034] In this embodiment, the wind curtain jet pipe 220 is a hollow cylinder, and a plurality of air outlets 410 are evenly arranged on the side, and the edges of the air outlets 410 are rounded.

[0035] Through this embodiment, the air outlets 410 of the wind curtain jet tube 220 are evenly distributed on its outer surface, and the aperture size and spacing are designed to facilitate the formation of a wind curtain 110 with uniform width and height; the edges of the air outlets 410 are rounded to ensure smooth output of the airflow, prevent turbulence, and further increase the stability of the wind curtain 110.

[0036] In this embodiment, the fan 210 and the wind curtain jet pipe 220 are threadedly connected, and a sealing ring 420 is provided at the connection.

[0037] Through this embodiment, the connection between the fan 210 and the wind curtain jet tube 220 is designed to be a threaded connection. The operator only needs to rotate the wind curtain jet tube 220 or the fan 210 to lock or loosen it, which reduces the installation and disassembly time of the fan 210 and the wind curtain jet tube 220 and facilitates the maintenance of the device. The connection between the fan 210 and the wind curtain jet tube 220 is sealed by an annular sealing ring 420. When the fan 210 is connected to the wind curtain jet tube 220, the sealing ring 420 can fit tightly to the connection to ensure that the airflow does not leak at the interface. In order to further enhance the sealing performance, the sealing ring 420 is made of wear-resistant rubber, which can not only provide a good sealing effect, but also resist moisture and chemical corrosion in the tunnel.

[0038] In this embodiment, a bolt clamp 510 is provided between the wind curtain jet tube 220 and the adjustment bracket 230 . The bolt clamp 510 is nested outside the wind curtain jet tube 220 and fixes the wind curtain jet tube 220 to the top of the adjustment bracket 530 .

[0039] Through this embodiment, a bolt clamp 510 is provided, which can be quickly fixed and loosened, which is convenient for installing and replacing the wind curtain jet tube 220 and reducing maintenance time; the provision of the bolt clamp 510 also facilitates the angle adjustment of the wind curtain jet tube 220, and it can be easily adjusted by loosening the bolts to adapt to protection in different directions; the bolt clamp 520 can also provide a firm connection, increase the structural stability between the wind curtain jet tube 220 and the adjustment bracket 230, and avoid structural loosening due to vibration and other reasons; the bolt clamp 510 can adapt to wind curtain jet tubes 220 of different sizes and shapes, and has good versatility.

[0040] In this embodiment, the adjustment bracket 230 includes an adjustment rod 520 vertically arranged below the clamp 510, a corresponding hollow support vertical rod 530 is vertically arranged below the adjustment rod 520, a reinforcement cross rod 540 is arranged between the support vertical rods 530, a base 550 is arranged below the support vertical rod 530, and a reinforcement diagonal brace 560 is arranged between the base 550 and the support vertical rod 530.

[0041] Through this embodiment, by setting the supporting vertical rod 530, the reinforcing horizontal rod 540 and the reinforcing diagonal brace 560, the overall structure is more stable, can resist external vibration and impact, and maintain the stability of the wind curtain jet tube 220; the design of the hollow supporting vertical rod 530 ensures the strength of the structure while reducing its own weight, which facilitates transportation and reduces manufacturing costs.

[0042] In this embodiment, each supporting vertical rod 530 has a first through hole 570, and the adjusting rod 520 is provided with a plurality of second through holes 580 with the same diameter as the first through holes 570, and fastening bolts 610 passing through the first through holes 570 and the second through holes 580 are correspondingly provided between the supporting vertical rod 530 and the adjusting rod 520.

[0043] Through this embodiment, the cooperation of the first through hole 570 and the multiple second through holes 580 allows the adjustment rod 520 to be precisely adjusted in the vertical direction, and the height of the wind curtain jet tube 220 can be adjusted by selecting different hole positions; the bolt connection provides a solid connection method, enhances the structural strength between the adjustment rod 520 and the supporting vertical rod 530, and improves the stability of the entire adjustment bracket 530.

[0044] Example 2 like Figure 1-14 As shown, this embodiment provides a high-altitude tunnel construction oxygen supply method, which is used to construct any high-altitude tunnel construction oxygen supply system described in Example 1, comprising the following steps: Step S1: Under the condition of using the forced-in air duct 160 for ventilation, an oxygen supply pipeline 170 is laid at the bottom of the tunnel, wherein the oxygen outlet of the oxygen supply pipeline 170 is located near the tunnel face 150, and the oxygen supply pipeline 170 extends from the oxygen concentrator 180 to the tunnel; Step S2: Connect the fan 210 to the air curtain jet tube 220, and then install the air curtain jet tube 220 and the fan 210 on the adjustment bracket 230, and adjust the adjustment bracket 230 so that the air curtain jet tube 220 is located between the outlet of the oxygen supply pipeline 170 and the outlet of the pressure-type air duct 160; Step S3: adjusting the wind curtain jet pipe 220 so that the wind curtain 110 generated by it is parallel to the tunnel ground, turning on the wind curtain fan 210 to generate airflow to blow into the wind curtain jet pipe 220, and forming a wind curtain 110 parallel to the ground; Step S4: the air curtain 110 divides the inner space of the tunnel into a breathing zone 140 and an isolation zone 130 .

[0045] Through this embodiment, the presence of the air curtain 110 divides the internal space of the tunnel into two areas: the breathing zone 140 (the area between the worker's breathing surface and the ground) and the isolation zone 130 (the area between the worker's breathing surface and the vault). Figure 11-14 As shown, after the wind curtain 110 is opened, the wind curtain 110 blocks the diffusion of oxygen to the isolation zone 130 and seals most of it in the breathing zone 140, so that oxygen is enriched in the breathing zone 140 where the workers are located, while the upper isolation zone 130 is relatively oxygen-free or has a low oxygen concentration. The dust and toxic and harmful gases generated by the construction of the face 150 will be discharged out of the cave under the action of the fresh airflow of the forced-in air duct 160. The deployed wind curtain 110 can form a protective effect, which will not affect the fresh airflow to discharge the dust and toxic and harmful gases generated by the face 150, and can also protect the oxygen in the oxygen supply pipeline 170 to stay near the face 150 to meet the oxygen needs of the construction workers. At the same time, the wind curtain 110 will also increase the original forced-in ventilation effect and improve the efficiency of toxic and harmful gas and dust discharge.

[0046] It is easy to understand that those skilled in the art can combine, split, reorganize, etc. the embodiments of the present application to obtain other embodiments based on one or several embodiments provided in the present application, and these embodiments do not exceed the protection scope of the present application.

[0047] The present invention and its implementation methods are described schematically above, and the description is not restrictive. The embodiments shown in the embodiments are only part of the implementation methods of the present invention, and the actual structure is not limited thereto. Therefore, if a person skilled in the art is inspired by the embodiments and designs a structure and an implementation method similar to the technical solution without creativity without departing from the purpose of the invention, they should all fall within the protection scope of the present invention.

Claims

1. A high altitude tunnel construction oxygen supply system, characterized by: The invention comprises a wind curtain generating device (120), wherein the wind curtain generating device (120) comprises a fan (210) and a wind curtain jet pipe (220), and further comprises a movable adjustable bracket (230) arranged below the fan (210) and the wind curtain jet pipe (220), wherein an air inlet (330) is formed at one end of the wind curtain jet pipe (220), and the fan (210) is arranged at the air inlet (330) of the wind curtain jet pipe (220), and the fan (210) cooperates with the wind curtain jet pipe (220) to generate a wind curtain (110), wherein the wind curtain (110) 10) The tunnel is divided into two parts, an upper part and an lower part. The isolation area (130) is located above the wind curtain (110). A forced-in air duct (160) is arranged along the tunnel in the isolation area (130). The outlet of the forced-in air duct (160) is located near the tunnel face (150). The breathing area (140) is located below the wind curtain (110). An oxygen supply pipeline (170) is arranged along the bottom of the tunnel in the breathing area (140). The outlet of the oxygen supply pipeline (170) is located near the tunnel face (150). An oxygen concentrator (180) is provided at the inlet of the oxygen supply pipeline (170).

2. The high altitude tunnel construction oxygen supply system according to claim 1, characterized in that: A plurality of guide rings (310) of different sizes are provided on the inner wall of the wind curtain jet pipe (220), and an air passage (340) is formed in the middle of the guide ring (310).

3. The high altitude tunnel construction oxygen supply system according to claim 2, characterized in that: The wind passage (340) comprises a windward surface (350) and a leeward surface (360) of the guide ring; the windward surface (350) of the guide ring (310) is an outwardly convex arc-shaped surface, and the leeward surface (360) is a flat surface; the windward surface (350) and the leeward surface (360) cooperate to form a streamlined wind passage (340) with a round head and a pointed tail.

4. The high altitude tunnel construction oxygen supply system according to claim 3, characterized in that: The connection point between the windward surface and the leeward surface of the guide ring (310) is the minimum inner diameter of the wind passage, and a plurality of guide rings (310) of different sizes are evenly arranged along the axial direction of the wind curtain jet tube (220), and the minimum inner diameters of the plurality of guide rings (310) of different sizes gradually decrease from the wind curtain jet tube (220) air inlet (330) to the tail of the wind curtain jet tube, and the radius R of the minimum inner diameter of the wind passage is d Change Satisfaction , where R0 is the radius of the wind curtain jet tube, k is the wind speed attenuation coefficient, and d is the distance from the fan (210).

5. The high altitude tunnel construction oxygen supply system according to claim 1, characterized in that: The wind curtain jet pipe (220) is a hollow cylinder, with a plurality of air outlets (410) evenly arranged on the side surface, and the edges of the air outlets (410) are rounded.

6. The high altitude tunnel construction oxygen supply system according to claim 1, characterized in that: The fan (210) and the wind curtain jet pipe (220) are threadedly connected, and a sealing ring (420) is provided at the connection.

7. The high altitude tunnel construction oxygen supply system according to claim 1, characterized in that: A clamp with bolts (510) is provided between the wind curtain jet tube (220) and the adjustment bracket (230), and the clamp with bolts (510) is nested on the outside of the wind curtain jet tube (220) and fixes the wind curtain jet tube (220) to the top of the adjustment bracket (530).

8. The high altitude tunnel construction oxygen supply system according to claim 1, characterized in that: The adjustment bracket (230) comprises adjustment rods (520) respectively arranged vertically below the clamps (510), corresponding hollow support vertical rods (530) are arranged vertically below the adjustment rods (520), reinforcement cross rods (540) are arranged between the support vertical rods (530), a base (550) is arranged below the support vertical rods (530), and a reinforcement diagonal brace (560) is arranged between the base (550) and the support vertical rods (530).

9. The high altitude tunnel construction oxygen supply system according to claim 8, characterized in that: The supporting vertical rods (530) are each provided with a first through hole (570), the adjusting rod (520) is provided with a plurality of second through holes (580) having the same diameter as the first through holes (570), and fastening bolts (610) passing through the first through holes (570) and the second through holes (580) are correspondingly provided between the supporting vertical rods (530) and the adjusting rod (520).

10. A method for supplying oxygen to high altitude tunnel construction, used for constructing an oxygen supply system for high altitude tunnel construction as claimed in any one of claims 1 to 9, characterized in that: The following steps are involved: Step S1: Under the condition of using a forced-in air duct (160) for ventilation, an oxygen supply pipeline (170) is laid at the bottom of the tunnel, wherein an oxygen outlet of the oxygen supply pipeline (170) is located near the tunnel face (150), and the oxygen supply pipeline (170) extends from an oxygen concentrator (180) into the tunnel; Step S2: connecting the fan (210) to the wind curtain jet tube (220), and then installing the wind curtain jet tube (220) and the fan (210) on the adjustment bracket (230), and adjusting the adjustment bracket (230) so that the wind curtain jet tube (220) is located between the outlet of the oxygen supply pipeline (170) and the outlet of the pressure-type air duct (160); Step S3: adjusting the wind curtain jet pipe (220) so that the wind curtain (110) generated by it is parallel to the tunnel ground, turning on the wind curtain fan (210) to generate airflow to blow into the wind curtain jet pipe (220), thereby forming a wind curtain (110) parallel to the ground; Step S4: The air curtain (110) divides the interior space of the tunnel into a breathing zone (140) and an isolation zone (130).

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