Plateau high-gas extra long separating type tunnel construction ventilation method

Abstract

The invention discloses the technical field of tunnel construction, and particularly relates to a plateau high-gas extra long separating type tunnel construction ventilation method. The tunnel construction ventilation method comprises the following steps that (1) the air volume needed for tunnel construction ventilation is calculated; (2) according to the plateau sea level elevation where a tunnel locates, the air density in the tunnel is calculated and corrected; (3) according to the calculating result of the air volume needed for ventilation, suitable plateau gas tunnel ventilation equipment is selected; (4) staged ventilation schemes are determined according to the tunneling length of the tunnel; and (5) a gas electricity locking system and a wind electricity locking system are arranged in the tunnel and working conditions are set. According to the characteristics of the separating type tunnel, after the air volume needed for construction is calculated and after the air density is corrected, the ventilation equipment is selected, so that the situation that resource waste is caused when the ventilation equipment is selected is avoided. The staged ventilation schemes are implemented according to the tunneling length of the tunnel, the tunnel ventilation effect is guaranteed, the gas density is diluted, and construction cost is reduced. The high-gas tunnel construction risk is reduced through the wind electricity locking system and the gas electricity locking system.

Description

technical field [0001] The invention relates to the technical field of tunnel construction, in particular to a ventilation method for construction of high-altitude, high-gas and long-separated tunnels. Background technique [0002] In recent years, my country's infrastructure construction has developed rapidly. With the acceleration of the western development and construction, a large number of expressways have been built in Sichuan, Tibet, Qinghai and other provinces and cities. For example, the Wenchuan-Maerkang Expressway is an important section of the "Chengdu-Dege-Tibet" line and the "Chengdu-Aba-Qinghai" line among the 16 Chengdu introduction lines planned by the Sichuan Provincial Expressway Network. An important traffic artery in the region. [0003] Zhegu Mountain Tunnel is a tunnel for Wenchuan-Maerkang Expressway passing through Zhegu Mountain, and it is one of the control projects of Wenchuan-Maerkang Expressway. The Zhegushan Tunnel is a road tunnel with separ...

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Problems solved by technology

[0007] The purpose of the present invention is to provide a high plateau high gas long separated tunnel for the problem that the gas in the tunnel cannot be diluted in time due to poor tunnel ventilation during the construction of the plateau high gas long tunnel after a strong earthquake. The method of construction ventilation, by calculating the ventilation volume required for the construction of the gas tunnel and correcting the air density of the plateau, making full use of the cross-hole for vehicles designed in the separate tunnel, implementing phased ventilation according to the excavation length, diluting the gas concentration, and ensuring strong earthquakes The ventilation effect of the plateau high gas tunnel after the development of cracks in the surrounding rock has very important guiding significance for the design and construction of similar high gas tunnel projects

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