The subway is built underground, so why doesn t a lot of rainwater flow down when it rains?

Because a special drainage channel is set up.

Because the drainage system on the subway side is very strong.

The drainage system is good, it won't clog.

Because there is also a drainage device underground.

Because the subway has a strong drainage system.

Because the subway has also built a drainage system.

Because the drainage facilities are very good.

When I first designed it, I thought about the problem of drainage, and the drainage system was better.

Because the subway builders made reasonable arrangements.

In order to prevent external water from entering from the subway entrance as well as the elevator shaft, the subway entrance is tens of centimeters higher than the road surface. In addition, the subway platform is equipped with a large number of sandbags for flood control, which can effectively prevent stagnant water from pouring into the subway under extreme conditions.

As the system in the subway is lower than the horizon, rainwater from the ground can easily pour into the facilities in the subway. Therefore, the subway has to be designed with adequate waterproof and drainage facilities, and even then the subway station may be flooded. For this reason, in the event of a heavy rainstorm, the moisture-proof plate at the entrance of the subway station and the waterproof gate on the route must be closed.

Waterproof design of subway tunnel:

From the tunnel point of view, the entire area is completely sealed, so groundwater rarely seeps through the tunnel walls, unless there is a serious accident that causes the hard tunnel walls to be destroyed, and the presence of groundwater just in the damaged area can lead to a large influx of water.

In addition, the subway tunnel also has a complete drainage system, the water generated in the subway will be collected into the drainage ditch, and at the same time, the subway will be equipped with powerful pumping machines at intervals to pump out the stagnant water and then enter the municipal drainage system.

Under normal circumstances, the subway will not be suspended, but if the subway is flooded due to heavy rain or the line is malfunctioning, the subway will be suspended. The subway is equipped with a large number of drainage facilities, and in general, rain does not cause the line to be suspended. However, if the subway is flooded or the line is out of order, the subway will stop operating for safety reasons.

Will the subway stop in the rainstorm.

As a kind of urban rail transit, the subway has the characteristics of fast speed, large capacity, electric traction, etc., and runs on a fully enclosed line, which is not affected by the noisy situation of ground transportation cars. Located in the center of the city, the subway line is located in an underground tunnel, which can save space, reduce noise and reduce interference, and has become the preferred means of traffic closure for many urban residents.

Because the subway system is generally lower than the horizon, in the design, taking into account the impact of rainfall, sufficient waterproofing and drainage measures are planned, the entrance of the subway station is designed with a moisture-proof board, and the line is equipped with a waterproof gate, and when a rainstorm occurs, the moisture-proof version and the waterproof gate will be closed, so that the water flow cannot enter, so under normal circumstances, the rainstorm will not affect the line.

However, if the subway is flooded or the line is out of order due to heavy rain, for the safety of passengers' lives and property, the subway will be suspended, and personnel will be organized to stretch passengers. For example, in July 2021, the heavy rainstorm in Zhengzhou washed away the flood prevention and waterlogging control of the Zhengzhou subway station, and the flood water broke through the retaining wall of the subway and poured into the subway station, causing the subway to stop operating.

Whether the subway station will be flooded in the event of heavy rain depends on the situation, and the flood prevention measures and drainage system of the subway are in condition.

For example, in 2016, many roads in Nanjing were seriously waterlogged, vehicles could not pass, and the highway could not be obtained from the ramp, and in some places the water was nearly one meter. According to the news from the three high-speed teams of the Traffic Management Bureau of the Nanjing Municipal Public Security Bureau, the double gates of the Nanjing Ring Road, Youfang Bridge, Jiangshan Street, Tiexin Bridge, Yulan Road and other roads are all waterlogged.

At the same time, the middle section of Software Avenue, the north and south intersection of Andemen Street, Fengtai South Road, Xiaohang Road, Mingcheng Avenue and Longxi Road and other main roads were seriously flooded and traffic was interrupted. Nanjing Metro Line 1 Zhonghuamen Station, Line 3 Mingfa Square and other stations were flooded and forced to withdraw from operation, and the track from Andemen to Tianlongsi on Line 1 was flooded with about 1 meter at one point. Some stations have a large backlog of passengers.

Heavy rain subway station flood prevention measures:

The planning, design, construction, management and maintenance of the urban drainage system are not matched with the rapid development of urban modernization, and the urban drainage pipe network cannot meet the drainage needs of heavy rain or continuous rainy weather.

At the same time, the design and construction of some subway stations are not perfect, and there is a lack of standards and norms for flood control in the rail transit industry in China, and the awareness of flood control work is not high, and the flood prevention preparation is not sufficient. Some subway operators still have the problem of imperfect subway flood control plans, and the emergency response site is not organized in place, and the further deterioration of the dangerous situation cannot be controlled in time.

Summary. Guangzhou Metro's 2021 "Water Ingress Accident Investigation Report" fully disclosed: direct economic losses of 10,000 yuan.

Guangzhou Metro's 2021 "Water Ingress Accident Investigation Report" fully disclosed: direct economic losses of 10,000 yuan.

At about 12:46 on July 30, 021, due to the sudden rainfall in the hall, the ground level retaining wall of Shenzhou Road Station of Guangzhou Metro Line 21, located in Science Avenue, Huangtan Xunyinpu District, Guangzhou City, was washed away and collapsed by stagnant water, and the surface water leaked into the foundation pit and poured into the station through the aisle, resulting in the suspension of operation for 7 hours at a total of 6 stations from Huangcun Station to Suyuan Station of Metro Line 21, with a direct economic loss of 10,000 yuan.

It depends. If it rains violently, the subway will be suspended. Heavy rain may cause a large area of water into the subway, affecting the normal operation of the subway, and will also cause passenger congestion. <

It depends. If there is heavy rain and the subway is flooded, it will be suspended. Heavy rain may cause a large area of water into the subway, affecting the normal operation of the subway, and will also cause passenger congestion.