How did the subway go underground?

I don't know upstairs, so don't talk about it.

Yes, each subway line will have its own garage, that is, the base. The garages are built on the ground, and the garages are connected to the main line track (that is, the subway tunnel). After the subway train is built, it will first be transported to the garage, and then the train will drive from the garage to the main track to the subway tunnel.

Drive in through the entrance. The track is laid in from the outside.

According to the construction method, the subway can be divided into open excavation method, hidden excavation method and cover excavation method; According to the order of construction, it can be divided into forward excavation method and reverse excavation method. Construction is generally built using the following common methods:

1) open excavation method is suitable for the building is more dense, the site conditions are relatively narrow foundation pit or trench, such as the depth of the foundation pit is larger, the groundwater level is higher, the stratum basically has no bearing capacity, the environmental protection requirements are higher, the use of slope excavation is difficult to ensure the safety and stability of the foundation pit, can be used when the enclosure pile, wall, the vertical open cut method is used.

2) foundation pit cover excavation method is suitable for building more dense, ground traffic is busy, site conditions are relatively narrow and large-scale foundation pit engineering, for the excavation range is larger, the groundwater level is high, the formation self-stability ability is poor, the precipitation is more difficult underground engineering or the use of open excavation is difficult to ensure the construction and environmental safety, can be considered to use the cover excavation method.

3) foundation pit cover excavation reverse method cover excavation reverse method is generally suitable for the construction of deep, large foundation pit or complex plane shape with relatively dense buildings, busy ground traffic and narrow site conditions.

Stupid, two, look at the explanation of the brother on the second floor, speechless!

There are two ways to get the subway inside:

1. Mainline railway transportation, simply put, means that the subway depot is directly connected to the underground when it is connected to the mainline railway. After the production of the subway is completed, it will be transported to the dispatching station of the subway by the track through the manufacturer's tractor.

There will be many subway trains parked at the dispatching station to ensure the normal operation of the subway on the day. Subway trains that receive the operation order will be driven into the underground track by track and start operation.

2. The whole line is underground, and the train is directly lifted from the ground to the ground. When this kind of train is running, it is directly on a fully enclosed line, and it is necessary to build a special track line, and generally in the central area of the city, an underground tunnel is basically built to avoid occupying the ground.

Advantages: 1. Land saving: Due to the high value of urban land in general metropolises, the railway is built underground, which can save ground space and make the ground land can be used for other purposes.

2. Reduce noise: The railway is built underground, which can reduce the noise on the ground.

3. Reduce interference: Because the driving route of the subway does not overlap or intersect with other transportation systems (such as surface roads), the traffic is less disturbed and can save a lot of commuting time.

4. Energy saving: global warming.

In question, the subway is the best means of mass transportation. Due to the stable speed of the subway, it saves a lot of commuting time, makes people happy to ride, and also replaces a lot of energy consumed by driving.

5. Reduce pollution: General cars use gasoline or oil as energy, while subways use electric energy, which has no exhaust emissions and will not pollute the environment.

The reason why some subways are on the ground and some are underground is because there are many factors that need to be considered when building subways, such as cost, geographical conditions, operational needs, etc.

1.Cost factor: The subway from the ground to the ground is more cost-effective than from the underground, because the underground construction of the subway requires the use of large machinery such as shield machines, and each kilometer of excavation is a cost of hundreds of millions of yuan. It is relatively cheaper to build a subway on the ground, and only a viaduct is required.

2.Geographical conditions: The geological conditions in some places are not suitable for excavation underground, so the subway line can only be built on the ground.

3.Operational needs: Compared with underground subways, above-ground subways can better adapt to the complexity of urban transportation, because the above-ground environment is better than underground, and the noise generated by subway operation is more acceptable to residents. At the same time, the repair and maintenance of the above-ground subway is also more convenient.

In summary, whether the subway is built above ground or underground, there are many factors that need to be considered to meet the needs of urban transportation and optimize cost-effectiveness.

The main banquet state is a matter of cost. If the subway can be built on the ground, it will not be elevated, and if it can be elevated, it will not be built underground. Generally, we call the elevated subway light rail, in fact, this is not right, according to the national standard, the elevated is also the subway, and the subway and light rail are mainly divided according to the capacity.

The cost of the elevated subway is much lower than the cost of the underground, but the elevated subway occupies a large space, the cost of demolition is high, and it will also bring a lot of noise to the surrounding buildings. Therefore, where the land price is high, the elevated highway cannot be built. In addition to the land price, there are some places where there are historical buildings, ruins and the like, and they cannot be elevated.

In addition, the throughput of elevated metro stations.

Generally, it is not as good as the underground, or the station hall needs to be built very large, so the place with a large passenger flow is also generally built underground subway station. For example, a large transfer station.

Most of the subway runs underground, but not all.

Whether it is a light rail or a subway, it can be built underground, above ground or on a viaduct.

Above. The subway is a type of railway transportation, which is proposed to operate underground, which is also the origin of the name, but sometimes in order to match the construction environment, and consider the construction and operation costs, it may be converted to an above-ground or elevated section. The subway proposes to use A-type or B-type trains, corresponding to the width of the train of 3 meters and meters respectively, and uses 5 8-card marshalling trains.

The capacity of the subway is relatively large, and it can reach about 3-70,000 passengers in a single hour, and it is also the first choice for many domestic rail transit talks.

1. Railway transportation, the depot of the city subway will be connected to the national disturbance railway, so that the railway can be used to transport vehicles, and the subway and the railway are using the standard gauge of 1435 mm, so the diesel locomotive can directly transport the subway to the depot;

2. Trucks are used to dig and transport, and the first will be contacted in advance before transportation, and the police will help seal the road at night, and after transporting to the depot, a large crane will be used to put the train on the track, and then use a diesel locomotive to pull it back into the garage.

There are three theories about how the subway got inside, one is that it can be transported by mainline rail, and it is connected to the underground when the subway depot is connected to the mainline railway. The second is to transport through various transportation and transportation methods. The third is to use the whole line underground to lift the train into the ground like a hoist.

The subway is a fast, large-volume, electrically driven rail transit built in the city, the train runs on a fully enclosed line, and the line located in the central city is basically located in an underground tunnel.

The subway is an urban rail transit system that covers all kinds of underground and above-ground right-of-way exclusive, high-density and high-volume urban rail transit systems, which is called MRT in Taiwan, China.

The subway is exclusive to the right of way, without level crossing, which is also the fundamental symbol of the subway to distinguish it from the light rail transit system, the world's first subway is the metropolitan subway in London, England, which was built in 1863.

Ground floor. The urban subway planning is mainly based on shallow (0m-minus 10m) and sub-shallow (minus 10-minus 30m) development, and the deep layer (minus 30m below) is reserved as a protective resource. The depth of the subway is more than 10 meters to 30 meters.

The subway is divided into stations and interval tunnels, the station generally needs to meet the needs of rapid personnel evacuation, in order to ensure safety and comfort, it is generally more suitable for shallow within 10 meters, and there are sub-shallow layers, that is, within 30 meters.

In addition to stratigraphic conditions, economic and other restrictions, because the construction of the subway is not simply a subway transportation facility, the silver cover subway station is also an important node of the city, and there are more supporting surrounding commercial development or superstructure properties, so its buried depth should also fully consider the interconnection with the commercial facilities or office facilities of the surrounding plots to achieve underground interconnection.

Subway trains are generally pulled directly by the manufacturer (OEM) to the depot of the subway through the large railway line. And not all tracks are underground, you can put them on the surface part of the same line, and then drive to the underground tracks.

The subway is a fast, high-volume, electrically powered rail transit built in a city. The train runs on a fully enclosed line, and the line in the central city is basically located in an underground tunnel, and the line outside the central city is generally located on a viaduct or on the ground, and the English is Metro (undergroundrailway, subway). The subway is an urban rail transit system (METRO) that covers all kinds of underground and above-ground right-of-way in urban areas, and is called "rapidtransit" by the Taiwan subway.