Ventilation control methods for traffic tunnels in the hydropower station hub project area

Abstract

This invention relates to a ventilation control method for traffic tunnel groups in hydropower station hub engineering areas, and pertains to the field of hydropower station technology. It utilizes tunnel intersections and / or pollutant emission points as ventilation nodes, dividing the tunnel group into sections based on these nodes. The method calculates traffic pollutants and excavation pollutants for each section during different construction periods, and, combined with vehicle routes and times, determines the required design air volume for each section during each construction period. This information is used to determine wind speed, wind direction, air outlets, and jet fans, and ventilation is carried out according to the required design air volume. This invention solves the problem of inappropriate ventilation in existing hydropower station hub engineering areas and is applicable to ventilation control of traffic tunnel groups in hydropower station construction.

Description

Technical Field

[0001] This invention relates to the field of hydropower station technology, and in particular to a ventilation control method for traffic tunnel groups in the key engineering area of ​​a hydropower station. Background Technology

[0002] Current ventilation control methods are mainly designed for highway tunnels, urban tunnels, and railway tunnels under conventional road conditions and traffic conditions. These tunnels have relatively simple structures and do not present complex working conditions such as the combined use of two-way and one-way traffic within tunnel groups, multiple air inlets and outlets, large elevation differences, complex traffic organization, difficult airflow organization, and the superposition of underground construction and tunnel traffic. Therefore, they cannot adequately meet the ventilation control needs of traffic tunnel groups in hydropower station hub project areas. Summary of the Invention

[0003] The technical problem solved by this invention is to provide a ventilation control method for traffic tunnel groups in the hub engineering area of ​​a hydropower station, thereby solving the problem of inadequate ventilation in the traffic tunnel groups in the hub engineering area of ​​a hydropower station.

[0004] The technical solution adopted by this invention to solve the above-mentioned technical problems is a ventilation control method for traffic tunnel groups in a hydropower station hub project area, comprising the following steps:

[0005] S01. Designate tunnel intersections and / or pollutant emission points as ventilation nodes;

[0006] S02. Based on ventilation nodes, the tunnel chamber group is divided into sections;

[0007] S03. According to the hydropower station construction plan, obtain the maximum traffic volume of each section of the tunnel cavern group during each construction period, and calculate the traffic pollutant air volume required for each section during each construction period based on the maximum traffic volume.

[0008] S04. Study the connection between the construction of traffic tunnel groups and underground caverns, investigate the pollutant emission of excavation construction in each construction period, and calculate the required air volume of excavation pollutants in each section in each construction period through three-dimensional numerical simulation.

[0009] S05. Study the required air volume of traffic pollutants and excavation pollutants in each network section during each construction period, and determine the required design air volume for each section during each construction period based on vehicle routes and times.

[0010] S06. Determine the wind speed, wind direction, air outlet and jet fan according to the required air volume of each section in each construction period.

[0011] S07. Control the ventilation fan according to the required air volume of each section and time period.

[0012] Furthermore, in S04, the Flunt software is used to calculate the airflow velocity, simulate the time for the blasting forced ventilation to dilute the blasting pollutants and the concentration of the pollutants when they diffuse to the ventilation nodes, and thus calculate the required air volume for diluting the excavation pollutants in each section during each construction period.

[0013] Furthermore, the required air volume for design = required air volume for traffic pollutants + required air volume for excavation pollutants.

[0014] Furthermore, in S06, the wind speed in each section does not exceed 8 meters per second.

[0015] Furthermore, in S06, the air outlet includes an air outlet and an air inlet, and the location of the air outlet and air inlet is determined based on the fact that the length of the tunnel through which the polluted air passes does not exceed 2 kilometers.

[0016] Furthermore, in S06, the basis for determining the wind direction is to avoid polluted winds obstructing the driver's view of the transport vehicle.

[0017] Furthermore, in S07, the number of transport vehicles entering the tunnel is controlled during blasting operations.

[0018] The beneficial effects of this invention are as follows: The ventilation control method for traffic tunnel groups in the hydropower station hub project area of ​​this invention uses tunnel intersections and / or pollutant emission points as ventilation nodes. The tunnel group is divided into sections based on these ventilation nodes, and the traffic pollutants and excavation pollutants in each section during each construction period are calculated. Combined with vehicle routes and times, the required design air volume for each section during each construction period is determined. Based on this, the wind speed, wind direction, air outlets, and jet fans are determined, and ventilation is carried out according to the required design air volume. This solves the problem of inappropriate ventilation in the traffic tunnel groups of the hydropower station hub project area in the prior art. Attached Figure Description

[0019] Appendix Figure 1 This is a flowchart illustrating the ventilation control method for the traffic tunnel group in the hydropower station hub project area according to the present invention. Detailed Implementation

[0020] The present invention relates to a ventilation control method for traffic tunnel groups in the key engineering area of ​​a hydropower station, as shown in the appendix. Figure 1 As shown, it includes the following steps:

[0021] S01. Designate tunnel intersections and / or pollutant emission points as ventilation nodes;

[0022] Specifically, a tunnel intersection is the point where tunnels meet on the same elevation plane.

[0023] S02. Based on ventilation nodes, the tunnel chamber group is divided into sections;

[0024] S03. According to the hydropower station construction plan, obtain the maximum traffic volume of each section of the tunnel cavern group during each construction period, and calculate the traffic pollutant air volume required for each section during each construction period based on the maximum traffic volume.

[0025] Specifically, the air volume required for traffic pollutants includes the air volume required for vehicle smoke and dust and the air volume required for vehicle exhaust CO.

[0026] S04. Study the connection between the construction of traffic tunnel groups and underground caverns, investigate the pollutant emission of excavation construction in each construction period, and calculate the required air volume of excavation pollutants in each section in each construction period through three-dimensional numerical simulation.

[0027] Specifically, the Flunt software was used to calculate the airflow velocity, simulate the time it takes for the forced ventilation during construction blasting to dilute the blasting pollutants and the concentration of the pollutants when they diffuse to the ventilation nodes, and thus calculate the required air volume for diluting the excavation pollutants in each section during each construction period.

[0028] S05. Study the required air volume of traffic pollutants and excavation pollutants in each network section during each construction period, and determine the required design air volume for each section during each construction period based on vehicle routes and times.

[0029] Specifically, the required air volume for design = required air volume for traffic pollutants + required air volume for excavation pollutants.

[0030] S06. Determine the wind speed, wind direction, air outlet and jet fan according to the required air volume of each section in each construction period.

[0031] Specifically, the wind speed in each section shall not exceed 8 meters per second. The air outlets include air outlets and air inlets. The location of the air outlets and air inlets is determined based on the following: the length of the tunnel through which the polluted wind passes shall not exceed 2 kilometers. The wind direction is determined based on the following: to avoid the polluted wind from obstructing the driver's view of the transport vehicle.

[0032] S07. Control the ventilation fan according to the required air volume of each section and time period.

[0033] Specifically, during blasting operations, the number of transport vehicles entering the tunnel should be controlled.

Claims

1. A ventilation control method for traffic tunnel groups in the key engineering area of ​​a hydropower station, characterized in that, Includes the following steps: S01. Designate tunnel intersections and / or pollutant emission points as ventilation nodes; S02. Based on ventilation nodes, the tunnel chamber group is divided into sections; S03. According to the hydropower station construction plan, obtain the maximum traffic volume of each section of the tunnel cavern group during each construction period, and calculate the traffic pollutant air volume required for each section during each construction period based on the maximum traffic volume. S04. Study the connection between the construction of traffic tunnel groups and underground caverns, investigate the pollutant emission of excavation construction in each construction period, and calculate the required air volume of excavation pollutants in each section in each construction period through three-dimensional numerical simulation. S05. Study the required air volume of traffic pollutants and excavation pollutants in each section during each construction period, and determine the required design air volume for each section during each construction period based on vehicle routes and times. S06. Determine the wind speed, wind direction, air outlet and jet fan according to the required air volume of each section in each construction period. S07. Control the ventilation fan according to the required air volume of each section and time period.

2. The ventilation control method for traffic tunnel groups in the hydropower station hub project area according to claim 1, characterized in that, In S04, the Flunt software is used to calculate the airflow velocity and simulate the time for the blasting forced ventilation to dilute the blasting pollutants and the concentration of the pollutants when they diffuse to the ventilation nodes. This allows for the calculation of the required air volume for diluting the excavation pollutants in each section during each construction period.

3. The ventilation control method for traffic tunnel groups in the hydropower station hub project area according to claim 1 or 2, characterized in that, In S05, the required air volume for design = required air volume for traffic pollutants + required air volume for excavation pollutants.

4. The ventilation control method for traffic tunnel groups in the hydropower station hub project area according to claim 1 or 2, characterized in that, In S06, the wind speed in each section shall not exceed 8 meters per second.

5. The ventilation control method for traffic tunnel groups in the hydropower station hub project area according to claim 1 or 2, characterized in that, In S06, the air outlet includes an air outlet and an air inlet. The location of the air outlet and the air inlet is determined based on the fact that the length of the tunnel through which the polluted air passes does not exceed 2 kilometers.

6. The ventilation control method for traffic tunnel groups in the hydropower station hub project area according to claim 1 or 2, characterized in that, In S06, the basis for determining the wind direction is to avoid polluted winds obstructing the driver's view of the transport vehicle.

7. The ventilation control method for traffic tunnel groups in the hydropower station hub project area according to claim 1 or 2, characterized in that, In S07, the number of transport vehicles entering the tunnel is controlled during blasting operations.

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