Ventilation system and ventilation method for underwater double-pipe municipal and road long and large shield tunnel

Abstract

The invention belongs to the technical field of municipal and road shield tunnels, and particularly relates to a ventilation system and ventilation method for an underwater double-pipe municipal and road long and large shield tunnel. The ventilation system is characterized in that a civil engineering smoke exhaust air duct is arranged on the top of the shield tunnel; smoke exhaust air shafts connected with the civil engineering smoke exhaust air ducts are arranged at the two ends of the shield tunnel correspondingly; smoke exhaust fans and air valves are arranged in the smoke exhaust air shafts; the middle portion of the shield tunnel is sequentially divided into a shield section A, a shield section B and a shield section C in the longitudinal direction of the tunnel; the areas of the portions, on the shield section A and the shield section C, of the civil engineering smoke exhaust air duct are equal; the area of the portion, on the shield section B, of the civil engineering smoke exhaust air duct accounts for 2 / 5 to 3 / 5 of the area, on the shield section A, of the civil engineering smoke exhaust air duct; and jet fans are arranged on the shield section B and open-cut and concealed sections at the two ends of the shield tunnel correspondingly. By means of the ventilation system and the ventilation method, the size requirement of the ventilation scheme for the long and large shield fracture surface is reduced, the project implementation difficulty and the construction risk are lowered, and the engineering construction cost 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 a ventilation method for an underwater double-pipe municipal and highway long shield tunnel. Background technique [0002] The choice of ventilation mode for underwater tunnels is related to various factors such as tunnel length, 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, vertical ventilation and vertical ventilation + key smoke exhaust. [0003] The full horizontal and semi-transverse ventilation methods need to set up special air ducts and fan rooms. The investment in civil construction is large, and the operation cost of later ventilation is high. It can effectively keep the smoke stratification in the event of a fire. The gas spreadin...

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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