Structure for preventing and reducing hazard of retention air mass in deep regulation and storage tunnel

Abstract

The invention discloses a structure for preventing and reducing the hazard of a retention air mass in a deep regulation and storage tunnel. The structure comprises a plurality of baffle assemblies which are arrayed at intervals in the axial direction of the deep tunnel top wall; the baffle assemblies are mounted at the top of the deep tunnel pipe wall, and each baffle assembly comprises a first fence-type baffle and a second fence-type baffle; each type of fence-type baffles are perpendicular to the axial direction of the tunnel and comprise a plurality of parallelly-arrayed grids and flow channels located between the grids; and the first grids and the second grids are arranged in a staggered mode in the axial direction of the deep tunnel to block moving air. Through the baffle assembliesarranged at the top of the deep regulation and storage tunnel, on the one hand, the moving air mass can be subjected to detour flow deceleration to lower the impact pressure of the retention air mass;on the other hand, the atmospheric mass at the top of the deep tunnel can be divided into small air masses so as to avoid formation of the harmful large-size retention air mass; and the two aspects are combined, the effects of preventing and reducing the hazard of the retention air mass in the deep regulation and storage tunnel are achieved finally.

Description

technical field [0001] The invention relates to a municipal deep tunnel engineering device, in particular to a structure for preventing and reducing the harm of trapped air masses in deep storage tunnels. Background technique [0002] In recent years, due to the impact of extreme weather such as heavy rains and the acceleration of urbanization in my country, many factors have led to frequent urban waterlogging, which has caused huge losses to social development and people's lives and properties. As an important means to deal with the waterlogging problem, the deep tunnel drainage system has gradually been applied in urban drainage planning by virtue of its own advantages. For example, cities such as Guangzhou and Shanghai have carried out the design and construction of deep tunnel projects. [0003] The deep tunnel drainage system is composed of inflow shaft, deep tunnel, drainage pump group and other parts. During the operation of the deep tunnel storage project, on the on...

AI Technical Summary

Problems solved by technology

The trapped air mass occupies a certain space in the entire deep tunnel. When the hydraulic transient occurs when the drainage pump is suddenly started, the phenomenon of pressurized water flow impacting the trapped air mass in the deep tunnel will inevitably occur, making the volume of the trapped air mass in a very short period of time. Rapid compression within a short period of time will generate a large impact pressure, which will affect the deep tunnel overflow and cause damage to the inner wall structure of the tunnel, and may cause safety accidents in the urban deep tunnel drainage system due to "air explosion"

However, as a new type of urban drainage system, the deep tunnel drainage system is generally built tens of meters underground, and the length of the deep tunnel between the two inflow shafts is generally more than 1 km, so that the tunnel can be installed at a position easy to gather gas above the main tunnel. State-of-the-art measures of air holes or air valves are too costly to implement

Prior Art 1 provides a partition channel arranged longitudinally on the top wall of a deep tunnel, and uses the partition channel to divide the large air mass into small air masses to solve the problem of violent exhaust at the inflow shaft. However, in this structure, the partition channel Airflow channels will still be formed between the tunnels, which cannot effectively reduce the movement speed of air masses, and cannot solve the problem of trapped air mass hazards inside the main body of the deep tunnel.

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