Construction Ventilation Structure and Ventilation Volume Control Method of Highway Tunnel

Abstract

The invention relates to the field of road tunnel construction and discloses a road tunnel construction ventilating structure and a ventilation control method thereof. The road tunnel construction ventilating structure comprises an intake roadway and a return roadway; the front end of each of the intake roadway and the return roadway is provided with a working face; a front transverse passage is communicated with the front of both the intake roadway and the return roadway; a fan facing the front end of a tunnel is disposed within the intake roadway; another fan opposite to the front end of the tunnel is disposed within the return roadway; at least one middle transverse passage all communicated with the front transverse passage is disposed between the front transverse passage and an opening of the tunnel; the middle transverse passages are connected between the intake roadway and the return roadway; each of the front transverse passage and the middle transverse passage is internally provided with one fan facing the return roadway. The road tunnel construction ventilating structure and the ventilation control method thereof have the advantages that power consumption can be greatly lowered at the premise of keeping the pollutant concentration in a designed range and intake of the transverse passages helps allow segmental control for the pollutant concentration of the return roadway.

Description

technical field [0001] The invention relates to the field of road tunnel construction, in particular to a road tunnel construction ventilation structure and a ventilation volume control method thereof. Background technique [0002] During the construction of a double-hole road tunnel or a road tunnel with a horizontal guide tunnel, the air volume required for tunnel construction ventilation is calculated, and the air volume required is controlled by the air volume required by the operating machinery in the tunnel. As the excavation distance increases, the transport vehicles in the tunnel The number of units gradually increases, leading to an increase in air demand and a gradual increase in ventilation energy consumption. The construction ventilation method needs to be converted from the initial single-head press-in ventilation to tunnel ventilation, that is, one tunnel is the air inlet lane, and the other tunnel is the return air lane. , Open the cross passage near the face ...

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Problems solved by technology

[0004] However, the applicant’s research found that in the tunnel construction project, the operating machinery at the face of the front end of the tunnel can be considered as centralized sewage discharge, and the operating machinery in the return air lane can be considered as uniform sewage discharge. distributed as figure 2 As shown, the wind speed from the face of the return airway to the tunnel opening is constant, and correspondingly, the concentration of CO and other pollutants in the return airway is distributed as image 3 As shown, the concentration of pollutants gradually increases from the face of the tunnel to the tunnel entrance, showing a triangular distribution. The pollutants at the entrance of the tunnel are the largest. To ensure that the concentration is within the design concentration range, the wind speed at the entrance of the return airway must reach a certain intensity, but the actual The concentration of pollutants in the front section of the tunnel is relatively small, and it does not require a high wind speed to meet the design standard. However, if the above ventilation method is used, the wind speed in the return air lane will be constant, which will undoubtedly cause a lot of energy waste, resulting in high ventilation energy consumption.

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