Ventilation system and method for underwater single-pipe upper and lower municipal and highway long shield tunnels

Abstract

The invention belongs to the technical field of municipal and highway tunnels, and particularly relates to a submarine single-pipe upper-lower layer long municipal and highway shield tunnel ventilation system and method. The system is characterized in that an upper lane and a lower lane are arranged inside a shield tunnel, a civil smoke removal air duct is arranged at the top of each of the upper lane and the lower lane, and smoke removal air shafts connected with the civil smoke removal air duct of the upper lane and the lower lane are arranged at both ends of the shield tunnel; the middle of the shield tunnel is divided into a shield segment A, a shield segment B and a shield segment C sequentially and longitudinally along the tunnel, area of the civil smoke removal air duct of the shield segment A is equal to that of the civil smoke removal air duct of the shield segment C, the area of the civil smoke removal air duct of the shield segment B is 1 / 5-3 / 5 of that of the civil smoke removal air duct of the shield segment A, and jet fans are respectively arranged in open excavated and hidden sections at the two ends of the shield segment B and the tunnel. Through the ventilation scheme, dimensional requirements on shield section are met, project implementation difficulty and construction risk are lowered, and cost in engineering construction is saved.

Description

technical field [0001] The invention belongs to the technical field of municipal and highway tunnels, and in particular relates to a ventilation system and method for an underwater single-pipe upper and lower municipal and highway long shield tunnels. Background technique [0002] The selection of the ventilation mode of an underwater tunnel is related to various factors such as the length of the tunnel, traffic flow, driving mode, environmental protection requirements at the entrance of the tunnel, and tunnel construction methods. At present, the commonly used tunnel ventilation methods include full horizontal, semi horizontal, longitudinal ventilation and longitudinal ventilation + focused smoke exhaust. [0003] The full horizontal and semi-horizontal ventilation methods need to set up special air ducts and fan rooms. The investment in civil engineering is large, and the later ventilation operation costs are high. In the event of a fire, the stratification of smoke can be...

AI Technical Summary

Problems solved by technology

The jet fan is arranged in two sections (arranged along the two ends of the tunnel to the middle), and the civil smoke exhaust duct and the jet fan are installed in the shield section at the same time, resulting in a larger shield section

The increase of the shield section will increase the difficulty of project implementation, construction risk and project cost, which to a certain extent restricts the application of the shield tunneling method in long underwater tunnels

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