A method for ventilating a three-hole parallel subsea tunnel construction

Abstract

The application provides a ventilation method for three-hole parallel submarine tunnel construction, which comprises the following steps: obtaining a tunnel construction air quality standard; when the service tunnel is not through, blowing air into the excavation opening of each tunnel, and discharging the air from the excavation opening of each tunnel after backflow; when the service tunnel is not through and the air quality of the main tunnel is less than the air quality standard, blowing air into the excavation opening of the service tunnel, part of the air entering the two main tunnels respectively in a transverse direction, discharging the air from the excavation opening of each main tunnel after backflow, and discharging the air from the excavation opening of the service tunnel; and when the service tunnel is through, blowing air into the excavation opening of the service tunnel, part of the air entering the two main tunnels respectively in a transverse direction, and backflowing in the service tunnel and discharging the air from the through opening of the service tunnel. The application aims to solve the problem that the existing ventilation method causes excessive loss of air volume during tunneling, which seriously affects the construction progress and the health of construction workers.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of tunnel construction, in particular to a ventilation method for three-hole parallel submarine tunnel construction. BACKGROUND

[0002] The second submarine tunnel in Qingdao Jiaozhou Bay can increase the traffic connection between the west coast new area and the east coast urban area, and promote the integration of transportation. With the increasing demand for cross-sea transportation, future cross-sea passenger flow is showing rapid growth, and the current cross-sea channel is difficult to meet the increasing demand for cross-sea passenger flow brought by the economic and social development of Qingdao city.

[0003] In the construction of a submarine tunnel, as the construction distance is extended, the problem of insufficient air supply at the tunnel face is prone to occur when the tunnel is ventilated, which seriously affects the construction progress and the health of construction personnel. How to effectively and quickly remove the pollutants generated by construction, mechanical operation and blasting operation in the tunnel from the construction area and diffuse to the tunnel entrance within a certain period of time is a key problem in the construction process of the second submarine tunnel in Qingdao Jiaozhou Bay. SUMMARY

[0004] The main purpose of the present application is to provide a ventilation method for three-hole parallel submarine tunnel construction, which aims to solve the problem that the existing ventilation method causes excessive loss of air volume during excavation, insufficient air supply at the tunnel face, and seriously affects the construction progress and the health of construction personnel.

[0005] To achieve the above-mentioned purpose, the present application provides a ventilation method for three-hole parallel submarine tunnel construction, the three-hole parallel submarine tunnel comprises a plurality of tunnels, the plurality of tunnels comprise two parallelly arranged main tunnels and a service tunnel arranged between the two main tunnels, and the ventilation method for three-hole parallel submarine tunnel construction comprises the following steps:

[0006] Obtain the tunnel construction air quality standard;

[0007] When the service tunnel is not connected, air flow is introduced at the excavation opening of each tunnel, and after backflow, the air flow is discharged from the excavation opening of each tunnel;

[0008] When the service tunnel is not connected, the air quality of the main tunnel is less than the air quality standard and meets the condition of opening a transverse communication channel, a first transverse communication channel is arranged according to a preset number and / or position, air flow is introduced at the excavation opening of the service tunnel, part of the air flow enters the two main tunnels in a transverse direction respectively, and then is discharged from the excavation opening of each main tunnel, part of the air flow backflows and is discharged from the excavation opening of the service tunnel;

[0009] After the service tunnel is dug through, a second transverse communication passage is added according to the excavation position added by the main tunnel, air is blown into the excavation opening of the service tunnel, part of the air flows into the two main tunnels respectively in a transverse direction, and then flows back from the service tunnel and is discharged through the through opening of the service tunnel.

[0010] Optionally, in the step of blowing air into the excavation opening of each tunnel and discharging the air after flowing back:

[0011] An axial flow fan is arranged at the excavation opening of each tunnel.

[0012] Optionally, in the step of blowing air into the excavation opening of each tunnel and discharging the air after flowing back:

[0013] Two fans are arranged in the two main tunnels, and the two fans are arranged on the side of each main tunnel away from the service tunnel.

[0014] Optionally, in the step of blowing air into the excavation opening of the service tunnel, part of the air flowing into the two main tunnels respectively in a transverse direction, part of the air flowing back, and part of the air being discharged through the excavation opening of the service tunnel:

[0015] A first fan is arranged at the excavation opening of the service tunnel.

[0016] Optionally, in the step of blowing air into the excavation opening of the service tunnel, part of the air flowing into the two main tunnels respectively in a transverse direction, part of the air flowing back, and part of the air being discharged through the excavation opening of the service tunnel:

[0017] A second fan is arranged at the excavation opening of the first transverse communication passage.

[0018] Optionally, in the step of blowing air into the excavation opening of the service tunnel, part of the air flowing into the two main tunnels respectively in a transverse direction, part of the air flowing back, and part of the air being discharged through the excavation opening of the service tunnel:

[0019] A first group of the first transverse communication passages is dug according to a preset position;

[0020] blowing air into the service tunnel, part of the air flows back in the service tunnel, and flows out of the excavation opening of the service tunnel, and part of the air flows into the two main tunnels through the first set of the first transverse communication channels, and then flows out of the excavation openings of the main tunnels.

[0021] Optionally, the step of blowing air into the service tunnel, part of the air flows back in the service tunnel, and flows out of the excavation opening of the service tunnel, and part of the air flows into the two main tunnels through the first set of the first transverse communication channels, and then flows out of the excavation openings of the main tunnels is followed by:

[0022] Excavating the second set of the first transverse communication channels according to the preset positions.

[0023] Closing the first set of the first transverse communication channels and opening the second set of the first transverse communication channels.

[0024] Blowing air into the service tunnel, part of the air flows back in the service tunnel, and flows out of the excavation opening of the service tunnel, and part of the air flows into the two main tunnels through the second set of the first transverse communication channels, and then flows out of the excavation openings of the main tunnels.

[0025] Repeating the above steps until the service tunnel is through.

[0026] Optionally, in the step of blowing air into the service tunnel according to the excavation positions of the main tunnels, and adding the second transverse communication channels according to the preset number and / or positions, part of the air flows into the two main tunnels respectively in a transverse direction, and then flows back from the service tunnel and is discharged from the through opening of the service tunnel after the service tunnel is through:

[0027] The excavation opening of the service tunnel and the through opening of the service tunnel are both provided with a jet fan.

[0028] Optionally, in the step of blowing air into the service tunnel according to the excavation positions of the main tunnels, and adding the second transverse communication channels according to the preset number and / or positions, part of the air flows into the two main tunnels respectively in a transverse direction, and then flows back from the service tunnel and is discharged from the through opening of the service tunnel after the service tunnel is through:

[0029] The excavation opening of the second transverse communication channel is provided with a third fan.

[0030] Optionally, after the service tunnel is through, according to the excavation position added by the main tunnel, a second transverse communication passage is added in a preset number and / or position, air flow is blown into the excavation opening of the service tunnel, part of the air flow enters the two main tunnels respectively in a transverse direction, and the air flow returns from the service tunnel and is discharged through the through opening of the service tunnel.

[0031] According to the preset position and the preset number, a plurality of second transverse communication passages are excavated;

[0032] Air flow is blown into the service tunnel, part of the air flow flows through the service tunnel and flows out through the through opening of the service tunnel, and part of the air flow enters the two main tunnels through the plurality of second transverse communication passages, returns through the second transverse communication passages and flows into the service tunnel, and is discharged through the through opening of the service tunnel.

[0033] In the technical scheme of the present application, tunnel excavation is divided into three stages, and different ventilation modes are adopted according to the air quality in each tunnel during excavation, so as to completely discharge harmful gases generated by blasting during tunnel construction and avoid safety hazards to workers who work on the front line for a long time. At the same time, a good ventilation environment can bring convenience to construction and speed up the construction progress. At the initial stage of excavation of the main tunnel, pressure ventilation is adopted, because the depth of excavation is small at this time, pressure ventilation can discharge the polluted gas in the tunnel. As the excavation depth increases, the air quality in the main tunnel is less than the air quality standard, but at this time, the condition for opening a transverse communication passage is met, and a first transverse communication passage is excavated between the service tunnel and the two main tunnels. Because the pressure ventilation mode will result in insufficient wind power and the polluted gas cannot be completely discharged, therefore, at this stage, the ventilation is carried out by using the port ventilation mode. After the service tunnel is through, in order to speed up the construction progress, a plurality of second transverse communication passages are needed to be through between the service tunnel and the two main tunnels, and construction is carried out at the same time, and the mixed ventilation mode is used to meet the discharge of the polluted gas. In this way, the polluted gas in the tunnel can be completely discharged, and the above ventilation mode can meet the ventilation demand of each stage, avoid too much polluted gas in the tunnel, and affect the health of the construction workers, and at the same time, the construction progress can be speeded up and the construction efficiency can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0034] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0035] Figure 1 A flow chart of an embodiment of the three-hole parallel submarine tunnel construction ventilation method provided by the present application;

[0036] Figure 2 For Figure 1 The ventilation schematic diagram in step S20;

[0037] Figure 3 For Figure 1 The ventilation schematic diagram in step S30;

[0038] Figure 4 For Figure 1 The ventilation schematic diagram in step S40.

[0039] BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Reference Name Reference Name 10 South Main Tunnel 1 Axial fan 20 North Main Tunnel 2 First fan 30 Service Tunnel 3 Second fan 40 First transverse communication passage 4 Jet fan 50 Second transverse communication passage 5 Third fan

[0041] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0042] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0043] It should be noted that if the embodiments of the present application 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 condition, etc. between components in a certain specific posture (as shown in the drawings), and if the specific posture changes, the directional indications also change accordingly.

[0044] In addition, if the description of "first", "second" and the like is involved in the embodiments of the present application, the description of "first", "second" and the like is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can be explicitly or implicitly included at least one of the features. In addition, the meaning of "and / or" appearing throughout the text includes three parallel schemes, for example, "A and / or B" includes A scheme, or B scheme, or A and B scheme. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of the ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor within the scope of protection required by the present application.

[0045] Qingdao Jiaozhou Bay No. 2 submarine tunnel can increase the traffic contact between the west coast new area and the east coast urban area, and promote the integration of the two sides. With the increasing demand for cross-sea traffic, the future cross-sea passenger flow presents rapid growth, and the present cross-sea channel is difficult to meet the increasing demand of cross-sea passenger flow brought by the economic and social development of Qingdao city; in the construction of the submarine tunnel, with the extension of the construction distance, the problem of insufficient air supply at the tunnel face is prone to occur during ventilation, which seriously affects the construction progress and the health of the construction personnel, how to effectively and quickly discharge the pollutants generated by the construction, mechanical operation and blasting operation in the tunnel to the construction area, and diffuse to the tunnel entrance within a certain time is the key problem in the construction process of Qingdao Jiaozhou Bay No. 2 submarine tunnel.

[0046] In view of this, the present application provides a three-hole parallel submarine tunnel construction ventilation method, Figure 1 The flowchart of an embodiment of the three-hole parallel submarine tunnel construction ventilation method provided by the present application is shown in the following specific drawings, which mainly describes the three-hole parallel submarine tunnel construction ventilation method.

[0047] The three-hole parallel submarine tunnel includes a plurality of tunnels, the plurality of tunnels include two parallelly arranged main tunnels, and a service tunnel arranged between the two main tunnels, in order to facilitate the description, the two main tunnels are defined as south line main tunnel 10 and north line main tunnel 20 respectively; it should be noted that in the actual excavation process, in order to ensure the construction progress, the tunnel construction is generally carried out by using the method of excavating at both ends at the same time, since the construction methods at both ends are the same, in order to facilitate the description, one end is taken as an example for description in the present application

[0048] Please refer to Figure 1 The three-hole parallel submarine tunnel construction ventilation method includes the following steps:

[0049] Step S10, obtaining a tunnel construction air quality standard;

[0050] Step S20, when the service tunnel 30 is not through, air flow is blown from the excavation opening of each tunnel, and after backflow, the air flow is discharged from the excavation opening of each tunnel;

[0051] Step S30, when the service tunnel 30 is not through, the air quality of the main tunnel is less than the air quality standard and meets the condition of developing a lateral communication channel, a first lateral communication channel 40 is arranged according to a preset number and / or position, air flow is blown from the excavation opening of the service tunnel 30, part of the air flow enters two main tunnels laterally respectively, and after backflow, the air flow is discharged from the excavation opening of each main tunnel;

[0052] Step S40, after the service tunnel 30 is through, according to the excavation position of the main tunnel, a second lateral communication channel 50 is added according to a preset number and / or position, air flow is blown from the excavation opening of the service tunnel 30, part of the air flow enters two main tunnels laterally respectively, and after backflow, the air flow is discharged from the service tunnel 30 through the through hole of the service tunnel 30.

[0053] In the technical scheme of the present application, tunnel excavation is divided into three stages, and different ventilation modes are adopted according to the air quality in each tunnel during excavation, so as to completely discharge the harmful gas generated by blasting during tunnel construction and avoid safety hazards to workers who work on the front line for a long time. At the same time, a good ventilation environment can bring convenience to construction and speed up the construction progress. During the initial stage of excavation of the main tunnel, the air in the tunnel can be discharged by using the press-in ventilation mode because the excavation depth is small at this time. With the deepening of the excavation depth, the air quality of the main tunnel is less than the air quality standard, but the condition of developing a lateral communication channel is met at this time. The first lateral communication channel 40 is excavated between the service tunnel and the two main tunnels. Because the press-in ventilation mode is used, the wind power is insufficient, and the polluted gas cannot be completely discharged. Therefore, the harbor ventilation mode is used for ventilation at this stage. After the service tunnel is through, multiple second lateral communication channels 50 are needed to be through between the service tunnel and the two main tunnels in order to speed up the construction progress and simultaneously construct. At this time, the mixed ventilation mode is used to meet the discharge of the polluted gas. In this way, the polluted gas in the tunnel can be completely discharged, and the above ventilation mode can meet the ventilation demand of each stage, avoid too much polluted gas in the tunnel, and affect the health of the construction workers. At the same time, the construction progress can be speeded up, and the construction efficiency can be improved.

[0054] It should be noted that in the process of tunnel construction, it is often necessary to carry out blasting in the tunnel, and a lot of toxic gases and dust particles will be generated in the process of blasting, which will cause harm to the bodies of construction workers, and therefore it is necessary to exhaust the toxic gases and dust particles in the tunnel.

[0055] Referring to Figure 2 In some embodiments, in step S20, an axial flow fan 1 is arranged at the excavation opening of each of the tunnels. Each of the axial flow fans 1 is used to blow fresh air outside the tunnel into the tunnel, to constantly supplement fresh air and replace polluted air in the tunnel. Further, in order to ensure the ventilation efficiency, a fan is arranged in each of the two main tunnels, and the two fans are arranged on the side of each of the main tunnels away from the service tunnel.

[0056] Before step S20, a forced ventilation simulation can be used to simulate the internal airflow organization of the tunnel and the diffusion of harmful gases after blasting; at the same time, a discrete phase model is used to simulate the migration law of particulate matters in the tunnel after blasting, and a ventilation strategy is determined according to the migration of the particulate matters in the tunnel; specifically, in step S20, the following steps can be performed:

[0057] Step S201, a first axial flow fan 1 is arranged on the side of the south line main tunnel 10 and the north line main tunnel 20 away from the service tunnel, and each of the first axial flow fans 1 is arranged at the excavation opening of the south line main tunnel 10 and the north line main tunnel 20. Each of the first axial flow fans 1 blows fresh air into the north line main tunnel 20 and the south line main tunnel 10, and sends the fresh air to the working face of the south line main tunnel 10 and the north line main tunnel 20 through an air pipe. The fresh air flows back at the working face, carries out the toxic gases and dust particles in the south line main tunnel 10 and the north line main tunnel 20, and flows out from the excavation opening.

[0058] Step S202, a second axial flow fan 1 is arranged at the excavation opening of the service tunnel. The second axial flow fan 1 blows fresh air into the service tunnel, and sends the fresh air to the working face of the service tunnel through an air pipe. The fresh air flows back at the working face of the service tunnel, carries out the toxic gases and dust particles in the service tunnel, and flows out from the excavation opening of the service tunnel.

[0059] Referring to Figure 3, collect the wind speed of different parts of the service tunnel when supplying wind to two main tunnel, simulate the dust transport law, optimize the construction ventilation mode, provide a theoretical basis for tunnel safety construction and multiple working faces simultaneous construction; before the service tunnel is not connected and the service tunnel does not meet the development of the first transverse communication channel 40, the forced ventilation mode is adopted; when the service tunnel meets the development of the first transverse communication channel 40, the first transverse communication channel 40 is developed, so that the service tunnel is connected with the south main tunnel 10 and the north main tunnel 20, and the port channel ventilation mode is adopted for ventilation.

[0060] Further, the first fan 2 is arranged at the excavation opening of the service tunnel; the second fan 3 is arranged at the excavation opening of the first transverse communication channel 40; in this way, the service tunnel is used as the air inlet hole, and the two main tunnels are used as the air return hole, thereby forming the port channel ventilation; by arranging two second fans in the service tunnel, the wind power of the two second fans is close to the first transverse communication channel 40 at the front end (the side facing the excavation direction is the front), the air volume is dispersed to the south main tunnel 10 and the north main tunnel 20 through the above two first transverse communication channels 40, and is transported to the south main tunnel 10 and the north main tunnel 20. The air flow returns to the tunnel face, and the dirty air is discharged from the side away from the south main tunnel 10 and the north main tunnel 20; specifically, when step S30 is performed, the following steps can be performed:

[0061] Step S301, excavate a first group of first transverse communication channels 40 according to the preset position;

[0062] Step S302, air flow is introduced into the service tunnel, part of the air flow returns in the service tunnel, flows out of the excavation opening of the service tunnel, and part of the air flow enters the two main tunnels through the first group of first transverse communication channels 40, and then is discharged from the excavation opening of each main tunnel.

[0063] In some embodiments, a first group of the first transverse communication passages 40 are excavated at the preset positions first, so that the service tunnel is in communication with the southbound main tunnel 10 and the northbound main tunnel 20, then the first fan 2 is arranged at the excavation opening of the service tunnel, while the second fan 3 is arranged at the excavation opening of the first group of the first transverse communication passages 40, the first fan 2 blows fresh air into the service tunnel, the fresh air is sent to the second fan 3 through the air pipe, the second fan 3 blows part of the fresh air into the first transverse communication passages 40, the fresh air enters the southbound main tunnel 10 and the northbound main tunnel 20 through the first communication passages, flows to the support surface of the southbound main tunnel 10 and the northbound main tunnel 20, returns, carries out the toxic gas and dust particles in the southbound main tunnel 10 and the northbound main tunnel 20, and flows out of the excavation opening of the southbound main tunnel 10 and the northbound main tunnel 20, so as to complete the cleaning of the air in the southbound main tunnel 10 and the northbound main tunnel 20; part of the fresh air blown by the first fan 2 flows to the support surface of the service tunnel through the air pipe, carries out the toxic gas and dust particles in the service tunnel, and flows out of the excavation opening of the service tunnel.

[0064] When the service tunnel is excavated to a second preset position, the following steps are performed:

[0065] Step S303, excavate a second group of the first transverse communication passages 40 according to the preset positions;

[0066] Step S304, close the first group of the first transverse communication passages 40, and open the second group of the first transverse communication passages 40;

[0067] Step S305, blow air flow into the service tunnel, part of the air flow returns in the service tunnel and flows out of the excavation opening of the service tunnel, and part of the air flow enters the two main tunnels through the second group of the first transverse communication passages 40, and is discharged from the excavation opening of each main tunnel;

[0068] Step S306, repeat the above steps until the service tunnel is through.

[0069] In some embodiments, when excavated to a certain depth, a second first transverse communication passage 40 needs to be opened, at this time, two groups of first transverse communication passages 40 are opened in the north main tunnel 20 and the south main tunnel 10, the second fan 3 at the excavation opening of the first group of first transverse communication passages 40 is moved to the excavation opening of the second group of first transverse communication passages 40, while the first group of first transverse communication passages 40 is closed, the first fan 2 sends fresh air into the service tunnel, which is sent to the second fan 3 through the air pipe, the second fan 3 sends the fresh air to the north main tunnel 20 and the south main tunnel 10 through the second group of first transverse communication passages 40, and the toxic gas and dust particles are brought out at the excavation opening of the north main tunnel 20 and the south main tunnel 10, and the exhaust of the tunnel is completed. The ventilation by the harbor channel type ventilation method can avoid the problem that the toxic gas and dust particles in the tunnel are not completely eliminated due to insufficient wind force, and ensures the physical safety of the construction workers.

[0070] Please refer to Figure 4 After the service tunnel is passed through, in order to speed up the construction progress, a new sublevel is opened in the north main tunnel 20 and the south main tunnel 10, and ventilation is carried out by the harbor channel type ventilation method and the mixed ventilation method; first, FLUENT is used to calculate and study the construction ventilation of the tunnel, there is fresh air in the air pipe, and there is harmful gas diffusion and dust particle migration generated by blasting, and in the calculation, the airflow flow in the tunnel is usually regarded as turbulent flow to be more in line with the actual situation; second, a turbulent flow model is used to simulate the wind flow field in the tunnel, a component transport model is used to simulate the concentration field of CO in the harmful gas, and a discrete phase model is used to simulate the concentration field of dust migration in the tunnel, and the power range of the fan is determined through the simulation of the above scenes.

[0071] Please continue to refer to Figure 4 The excavation opening of the service tunnel and the through opening of the service tunnel are provided with a jet fan 4, and the excavation opening of the second transverse communication passage 50 is provided with a third fan 5.

[0072] Specifically, in some embodiments, step S40 can be performed by the following steps:

[0073] Step S401, excavate a plurality of groups of second transverse communication passages 50 according to the preset positions and the preset number;

[0074] Step S402, air is blown into the service tunnel, part of the air flows through the service tunnel, and flows out through the through hole of the service tunnel, part of the air enters the two main tunnels through the second transverse communication channel 50, and flows back into the service tunnel through the second transverse communication channel 50 and is discharged through the through hole of the service tunnel.

[0075] In some embodiments, a jet fan 4 is arranged at the excavation hole and the through hole of the service tunnel. The jet fan 4 arranged at the excavation hole blows fresh air into the service tunnel, and the fresh air is sent to each third fan through an air pipe. Each third fan 5 blows fresh air into the north main tunnel 20 and the south main tunnel 10 through each second transverse communication channel 50, flows to the new working face of the south main tunnel 10 and the north main tunnel 20, and carries out the toxic gas and dust particles in the south main tunnel 10 and the north main tunnel 20, and then flows into the service tunnel from each second transverse communication channel 50 and flows to the through hole of the service tunnel, passes through the jet fan 4 arranged at the through hole, and flows out of the service tunnel. The above ventilation strategy uses the service tunnel to supply air, and on the basis of using the jet fan 4 to supply air to the working face of the south main tunnel 10 and the north main tunnel 20 (at this time, the air flow direction of the jet fan 4 remains the same as that of the second stage air flow), a third fan is additionally arranged at the excavation hole of each second transverse communication channel 50 to avoid insufficient air flow during long-distance air supply. The jet fan 4 arranged at the excavation hole of the service tunnel provides fresh air for the third fan, ensures the orderly supply of air, and the jet fan 4 arranged at the through hole of the service tunnel can improve the exhaust speed of the toxic gas and dust particles in the service tunnel, accelerate the flow of air, and improve the exhaust speed of the polluted air at the new working face. In this way, after the service tunnel is passed through, multiple working faces (new working faces) can be continuously opened to speed up the construction progress, multiple second transverse communication channels 50 arranged in pairs are used to supply air to the new working face of the south main tunnel 10 and the north main tunnel 20, simulate the migration law of harmful gases in the service tunnel after blasting construction of multiple working faces, and optimize the design of the air supply mode.

[0076] The above only describes the preferred embodiments of the present application, and does not limit the patent scope of the present application. Any equivalent structural transformation made on the basis of the concept of the present application, or direct / indirect application in other related technical fields is included in the patent protection scope of the present application.

Claims

1. A ventilation method for constructing a three-section parallel subsea tunnel, characterized in that, The three-tunnel parallel subsea tunnel comprises multiple tunnels, including two parallel main tunnels and a service tunnel located between the two main tunnels. The ventilation method for constructing the three-tunnel parallel subsea tunnel includes the following steps: Obtain air quality standards for tunnel construction; When the service tunnel is not completed, airflow is blown into the excavation opening of each tunnel, and after flowing back, it is discharged from the excavation opening of each tunnel. When the service tunnel is not yet completed, and the air quality of the main tunnel is lower than the air quality standard and meets the conditions for opening a lateral connecting passage, a first lateral connecting passage is set up according to a preset number and / or location. Airflow is blown in from the excavation opening of the service tunnel. Part of the airflow enters the two main tunnels laterally and is discharged from the excavation openings of each main tunnel. Part of the airflow flows back and is discharged from the excavation opening of the service tunnel. This includes: excavating a first set of the first lateral connecting passages at preset locations; blowing airflow into the service tunnel; and having part of the airflow flow back within the service tunnel and discharge from the excavation opening of the service tunnel. The airflow enters the two main tunnels through the first set of first transverse connecting channels and exits from the excavation openings of each main tunnel; a second set of first transverse connecting channels is excavated at a preset location; the first set of first transverse connecting channels is closed, and the second set of first transverse connecting channels is opened; airflow is blown into the service tunnel, a portion of the airflow flows back into the service tunnel and exits from the excavation opening of the service tunnel, and a portion of the airflow enters the two main tunnels through the second set of first transverse connecting channels and exits from the excavation openings of each main tunnel; the above steps are repeated until the service tunnel is completed; After the service tunnel is completed, according to the excavation location of the main tunnel, a second transverse connecting channel is added in a preset number and / or location. Airflow is blown in from the excavation opening of the service tunnel, and part of the airflow enters the two main tunnels laterally and flows back from the service tunnel and is discharged through the connection opening of the service tunnel. The construction progress of the service tunnel is faster than that of the main tunnel.

2. The ventilation method for constructing a three-tunnel parallel subsea tunnel as described in claim 1, characterized in that, In the step of blowing air into the excavation opening of each of the tunnels, and then expelling it from the excavation opening of each of the tunnels after recirculation: An axial flow fan is installed at the excavation entrance of each of the tunnels.

3. The ventilation method for constructing a three-tunnel parallel subsea tunnel as described in claim 1, characterized in that, In the step of blowing air into the excavation opening of each of the tunnels, and then expelling it from the excavation opening of each of the tunnels after recirculation: Both main tunnels are equipped with ventilation fans, and both ventilation fans are located on the side of each main tunnel away from the service tunnel.

4. The ventilation method for constructing a three-section parallel subsea tunnel as described in claim 1, characterized in that, In the steps of setting up a first transverse connecting channel according to a preset number and / or location, blowing air in from the excavation opening of the service tunnel, part of the airflow entering the two main tunnels laterally and then exiting from the excavation opening of each main tunnel, and part of the airflow flowing back and exiting from the excavation opening of the service tunnel: A first ventilation fan is installed at the excavation entrance of the service tunnel.

5. The ventilation method for constructing a three-section parallel subsea tunnel as described in claim 1, characterized in that, In the steps of setting up a first transverse connecting channel according to a preset number and / or location, blowing air in from the excavation opening of the service tunnel, part of the airflow entering the two main tunnels laterally and then exiting from the excavation opening of each main tunnel, and part of the airflow flowing back and exiting from the excavation opening of the service tunnel: A second fan is installed at the excavation opening of the first transverse connecting channel.

6. The ventilation method for constructing a three-section parallel subsea tunnel as described in claim 1, characterized in that, After the service tunnel is completed, according to the excavation location of the main tunnel, a second transverse connecting channel is added in a predetermined number and / or location. Airflow is blown in from the excavation opening of the service tunnel, and part of the airflow enters the two main tunnels laterally and flows back into the service tunnel, exiting through the connection opening of the service tunnel. Both the excavation entrance and the through entrance of the service tunnel are equipped with jet fans.

7. The ventilation method for constructing a three-tunnel parallel subsea tunnel as described in claim 1, characterized in that, After the service tunnel is completed, according to the excavation location of the main tunnel, a second transverse connecting channel is added in a predetermined number and / or location. Airflow is blown in from the excavation opening of the service tunnel, and part of the airflow enters the two main tunnels laterally and flows back into the service tunnel, exiting through the connection opening of the service tunnel. A third fan is installed at the excavation opening of the second transverse connecting passage.

8. The ventilation method for constructing a three-tunnel parallel subsea tunnel as described in claim 1, characterized in that, After the service tunnel is completed, according to the excavation location of the main tunnel, a second transverse connecting channel is added in a preset number and / or location. Airflow is blown in from the excavation opening of the service tunnel, and part of the airflow enters the two main tunnels laterally and flows back into the service tunnel, exiting through the connection opening of the service tunnel. The steps include: Multiple sets of the second transverse connecting channels are excavated according to the preset positions and the preset number; Airflow is blown into the service tunnel. Part of the airflow flows through the service tunnel and exits through the service tunnel's through-hole. Part of the airflow enters the two main tunnels through multiple sets of second transverse connecting channels, flows back into the service tunnel through the second transverse connecting channels, and exits through the service tunnel's through-hole.

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