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Tunnel natural ventilation system

A technology of natural ventilation and tunneling, which is applied in the ventilation of mines/tunnels, mining equipment, earthwork drilling and mining, etc. It can solve the problems of limited dispersion and discharge of pollutants, high construction costs of natural ventilation shafts, and public spaces in large cities. Achieve the effect of saving tunnel construction and operating costs, significant social benefits, and reducing construction costs and floor space

Inactive Publication Date: 2017-03-15
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The obtained results show that the wind speed in the wind shaft is low regardless of the natural ventilation opening at the entrance or exit of the tunnel (the maximum wind speed is less than about 1.5m / s, and the average is 0.7-1.0m / s, and the specific air volume varies with the flow rate and other factors. different), the air volume is very small, and there are in and out, and the effect of pollutant dispersion is limited.
At the same time, natural wind shafts are expensive to build and occupy a large amount of urban public space

Method used

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  • Tunnel natural ventilation system
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Embodiment 1

[0020] refer to figure 1 As shown, the present invention firstly provides a tunnel natural ventilation system, which is mainly used for exhausting air, wherein, the wall surface of the tunnel 1 is provided with a ventilation shaft 2 leading to the outside world, and the ventilation shaft 2 is connected to the One end of the tunnel 1 communicates with an induction pipe 3 protruding into the tunnel 1 , and the induction pipe 3 is arranged along the inner wall of the tunnel 1 and parallel to the driving direction.

[0021] Specifically, as figure 1 As shown by the arrow, the induction pipe 3 includes a connection port 30 and an induction port 32, the connection port 30 communicates with the ventilation shaft 2, and the induction port 32 faces the driving direction, so that the traffic flow in the tunnel 1 can be controlled by traffic. The total pressure of the induced airflow is the driving force, and the polluted airflow is actively discharged from the tunnel 1 through the natu...

Embodiment 2

[0024] On the basis of the first embodiment, this embodiment makes certain changes in the setting of the induction pipe, so that the natural ventilation system of the entire tunnel is mainly used for air intake. Specifically, as figure 2 As shown, the induction pipe 3a includes a connection port 30a and an induction port 32a, the connection port 30a is communicated with the ventilation shaft 2a, and the induction port 32a faces away from the driving direction, so that the tunnel 1a is controlled by the traffic in the tunnel 1a. The negative pressure formed by the induced airflow acts as a driving force to actively introduce outdoor fresh air into the tunnel 1a, which is more conducive to uniform air intake. The other structures are basically the same as those in Embodiment 1, so they will not be repeated here.

[0025] After completing the above-mentioned implementation process, the following characteristics of the present invention should be reflected:

[0026] 1) This sys...

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Abstract

The invention discloses a tunnel natural ventilation system. A ventilating shaft which is communicated to the outside is arranged on the wall surface of a tunnel, an induction tube which stretches into the tunnel is arranged on one position where the ventilating shaft is communicated to the tunnel, and the induction tube is arranged in a direction along a driving direction in the tunnel; the induction tube comprises a connector and an induction opening, the connector is communicated with the ventilating shaft, when airflow in the tunnel needs to be discharged out of tunnel space, the induction opening faces towards the driving direction; when ambient air needs to be injected into the tunnel space, the induction opening is back to the driving direction. The tunnel natural ventilation system can obviously improve natural ventilation quantity in the tunnel and ventilation efficiency, and inflict control on wind direction of the ventilation, thus effectively improving emission pollution status in the tunnel; meanwhile, quantities of the ventilating shafts and areas of cross sections of the ventilating shafts are sharply decreased, and construction cost and occupation of cit ground landscape space are thus obviously lowered.

Description

technical field [0001] The invention belongs to the field of tunnel engineering and relates to a ventilation system, especially a natural ventilation system. Background technique [0002] At present, for urban tunnels, the concentrated discharge of pollutants from vehicles at the entrance of the tunnel is an important factor that causes air pollution near the tunnel and threatens the health of the people. Therefore, appropriate ventilation measures must be adopted. If the mechanical ventilation method is adopted, the civil construction investment and operation and management costs are high, and it is difficult to set up a mechanical ventilation tower in the urban area and affects the urban landscape. In contrast, the natural ventilation method does not require ventilation fans, has no power consumption, and can reduce the height of the tunnel section, which can save tunnel construction and operation costs, and is obviously economical. Urban tunnels are characterized by shor...

Claims

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Application Information

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IPC IPC(8): E21F1/00
CPCE21F1/003
Inventor 明岗郑晋丽
Owner TONGJI UNIV