How was the viaduct built? Is a viaduct an urban expressway?

To repair a bridge is to dig the foundation first, then make the bridge pillars and put the beams of the bridge slabs, then pave the bridge slabs, and finally pave the road surface and install railings. The work content of repairing viaducts is basically the same as repairing bridges on the water. And it's easier.

A structure that spans space across a bridge, referred to as a bridge span or bridge span structure. The superstructure of the bridge is supported on the piers and abutments by bearings, and its structural type determines the form of the bridge.

1. Composition. The bridge superstructure consists of three parts: the bridge deck, the main beam and the bearing.

1.The part of the bridge deck that is used for direct traffic by vehicles and pedestrians. The railway bridge deck has steel rails and sleepers supported by the open bridge deck of the longitudinal and cross beam system; There is ballast bridge deck composed of ballast groove plate, ballast, sleeper and rail; There are rails directly connected to the bridge deck or main girder without ballast and sleeperless deck.

2.The main beam is the main load-bearing structure of the bridge and is the main body of the bridge superstructure. The main girder of a railway bridge is generally two pieces.

The spacing of the main girders of the small span is not large, and the bridge deck can be laid directly on the main girders. There are also those that use multi-piece main beams. The main beam can be made into a solid plate girder, a rigid frame or truss formed by the rods, and a box girder formed by combining the main girder with the bridge deck and the coupling system.

3.Bearing The supporting part of the bridge superstructure. Its function is to transmit the supporting reaction force (including vertical force and horizontal force) of the superstructure to the bridge pier, and ensure that the superstructure has the static conditions required by the design under the influence of load and temperature change.

There are two kinds of bearings: movable bearings and fixed bearings, which can be made of steel, rubber or reinforced concrete of a certain grade. Rubber bearing is a new type of bearing, which has the advantages of light weight, low height, simple structure, easy processing and manufacturing, less steel consumption, low cost and convenient installation.

Second, the type according to the position of the bridge deck placed in the superstructure, the bridge superstructure can be divided into upper bearing type, lower bearing type (wearing type or semi-wearing type) and middle bearing type. The top-, bottom-, and middle-bearing decks are placed at the top, bottom, and middle of the superstructure, respectively. According to the structural form of the main girder of the superstructure or the characteristics of the main load-bearing components, the bridge superstructure can be divided into plate beams, truss girders, arch bridges, rigid frames (structures) and oblique leg rigid structures, cable-stayed bridges, suspension bridges and other types.

1.Plate beam The cross-sectional form of plate beam is generally rectangular, I-shaped, T-shaped, shaped and box-shaped, which is suitable for simply supported beams of small and medium spans and continuous beams of large spans. Commonly used are concrete slab girders, steel plate girders, bonded beams, box beams and trough beams.

Concrete slab beams. Including ordinary reinforced concrete beams and prestressed concrete beams. Industrialization and mechanized construction can be adopted, and sand and gravel aggregates can generally be taken locally, and the amount of steel used is small; The maintenance work is simple; Low noise when driving; Long service life.

For small and medium-span railway bridges, prestressed concrete beams are basically used in all countries. And the implementation of standardization, serialization and prefabricated assembly construction.

Basically, it's the same as building a house, from the bottom up, and now the main body is decorated.

How was the viaduct built? The 3D animation restores everything and solves all the doubts for you.

The main differences are, different properties, different main functions, and different main features, as follows:

First, the nature is different.

1. Viaduct.

Generally refers to bridges that cross deep ravines and canyons in place of high embankments, as well as bridges that cross roads in urban bridges, supported by towers or pillars with high support.

2. Overpass.

The full name is "three-dimensional crossing bridge", which refers to the modern bridge that is layered up and down and does not disturb each other in multiple directions at the intersection of two or more intersections, including the sunken tunnel in the three-dimensional crossing project (because the bridge structure will be formed above the main body of the tunnel).

Second, the main functions are different.

1. Viaduct.

Towers or pillars with high supports, bridges that cross valleys, rivers, roads, or other low-level obstacles. After the development of the city, the traffic is congested, the buildings are dense, and the streets are difficult to widen, the use of this kind of bridge can evacuate the traffic density and improve the transportation efficiency. In addition, in the inter-city highway or railway, in order to avoid horizontal intersection with other lines, save land, and reduce subsidence of the roadbed (in some areas), this kind of bridge can also be used instead of embankment.

2. Overpass.

Avoid multi-directional vehicles intersecting at interchanges. The main function is to enable vehicles in all directions to pass quickly without being controlled by traffic lights on the intersection.

Third, the main features are different.

1. Viaduct.

The height of the pier is high, and the reinforced concrete row frame or single-column and double-column reinforced concrete piers are generally used.

2. Overpass.

The road plane is separated or intersected in three dimensions to form multiple layers.

Summary. Hello! Urban expressways refer to:

There is a ** divider in the urban road, with more than four lanes, all or part of the three-dimensional intersection and controlled access, for the vehicle to travel at a higher speed of the road. Generally speaking, the local traffic management department will publicize the "urban expressway" section in its jurisdiction. This depends on how the local traffic management department stipulates, generally urban ring roads, highways, provincial and municipal highways within the urban area are urban expressways, that is to say, as long as you go out of the city, they are all urban expressways, and the expressways in the city are also urban expressways such as viaducts.

Hello! Urban expressway refers to: the urban road is equipped with a ** separator, with more than four lanes, all or part of the three-dimensional intersection and control access, for vehicles to travel at a higher speed of the road.

Generally speaking, the local traffic management department will publicize the "urban expressway" section in its jurisdiction. This depends on how the local traffic management department stipulates, generally urban ring roads, highways, provincial and municipal highways within the urban area are urban expressways, that is to say, as long as you go out of the city, they are all urban expressways, and the expressways in the city are also urban expressways such as viaducts.

The differences between expressways and elevated roads are as follows: 1. The speed limit is different: the speed limit on expressways is generally 80, and the speed limits on expressways are generally different

Expressways are only tolled to pass, while expressways are not tolled. 3. Different control: there should be an intermediate sub-belt between the opposite roadway of the expressway, and its import and export should be fully controlled or partially controlled.

A highway is a highway that allows cars to separate lanes and drive at high speeds and control all access to highways. 4. Different settings: the highway requires a smooth route, a small longitudinal slope, a width of 4-6 lanes on the road surface, a separator in the middle, an efficient pavement of asphalt concrete or cement concrete, and a tough road fence where necessary, but no expressway.

5. Different scope: Expressway is a high-grade highway within the city and between the city and the satellite city, and the scope is limited. The scope of the expressway is between cities and is larger.

Viaduct Sakura CaveUnlike the different functions of the flyover, the flyover is mainly to cross the road and provide pedestrians with access to the street, while the viaduct is to cross the existing line or deep ditch river to relieve traffic pressure. Flyovers are generally steel structures, while viaducts are generallyReinforced concrete structureThe overpass only spans an intersection, which is equivalent to a bridge, while the viaduct is a road built by means of a bridge, which is much longer than the overpass, spanning more than several dozens of intersections.

Common sense of road traffic safety

Walk safely. When walking, use the sidewalk.

Keep to the right side of the road. Cross the road and take the crosswalk. When walking, look first at the vehicle on the left side of the ridge and then at the vehicle on the right. There are traffic lights.

Pedestrian crossings, when the green light is on, can be passed. When the red light is on, no traffic is allowed.

For crosswalks with self-service traffic lights, press the crosswalk switch and wait for the green light to turn on and the motor vehicle will stop before passing. When the red light is on or the waiting signal is displayed, it is forbidden to pass. Areas with overpasses or underpasses that do not cross the road.

Safe ride. Do not rush towards the door until the vehicle stops. After the vehicle is stopped, get off first and then get on, and get on and off in order.

Once you get on the bus, hold it up or sit down, and don't deliberately crowd it. Do not wait for a vehicle on a motorway or greet a commercial car. Do not get on or off the left side of the motor vehicle on the motorway.

Do not carry flammable, explosive, corrosive and other prohibited items on the bus. In the event of a traffic accident, the vehicle must obey the command of the sales staff.

Common sense of traffic accident escapeWhen you are trapped in the vehicle you are riding in in a traffic accident, you can break the window glass to escape. After escaping from the vehicle, stay away from the accident site to prevent injuries caused by the vehicle catching fire.

The tallest overpass in China is in Shanghai.

Shanghai Humin Elevated Road is a closed elevated road connecting downtown Shanghai and Xinzhuang Interchange, with a total length of kilometers. Create the highest height of China's elevated interchange in the middle ring section of the Shanghai-Min elevated interchange. The 42-meter-high elevated interchange is composed of five levels, spanning railways, light rails and highways, and its construction difficulty and risk are unique in the history of urban bridge construction in Shanghai.

Chinese name: Shanghai Humin Elevated Road.

Starting point: downtown Shanghai.

Destination: and Xinzhuang Interchange.

Overall length: km.

Category: Closed elevated road.

The main control project of Zhensheng Expressway - the main bridge of the Baling River Bridge was closed yesterday, the main span of 1088 meters, on the canyon of more than 300 meters high erection of the extra-large bridge, known as "the world's most mountain bridge".

Preparation materials: a deck of playing cards, a level table.

1. Pair the two playing cards together to form an A-shaped triangular pillar. The interval between the two playing cards should not be too big or too small, whichever is smooth. 2. Build two more A-shaped triangular pillars next to it according to this method.

3. Place two playing cards on the sharp corners of the three A-line pillars. 4. Then build two A-shaped pillars on the placed playing cards. On top of the two A-shaped pillars, a playing card is placed.

1 First, prepare the following materials: A4 paper, scotch tape, see image below. 2 Then, roll up the paper, four short sheets and two long sheets, see the figure below. 3 Then fold the short half in half, as shown in the image below.

4 Then, glue the short roll of paper folded in half to the long paper tube, as shown in the figure below. 5 Then do the same for the other bridges and fix them as the foundation pillars of the bridge, as shown in the image below. 6 Then take another piece of paper and fold it to the appropriate width with the bridge deck, as shown in the image below.

I've played, it's very simple, fold a card out of a small portion, you can see it as a fifth, and then the tape sticks, every three playing cards are extended into a three-dimensional triangle shirt shape, and then in the triangle is to put a playing card, has been solidified stability, and then repeatedly do it, as long as you are careful, it is very stable can also be very high, I and my friends won the first place 145 cm, it, absolutely practical...

The definition is different: the overpass is mainly a land bridge established at an important traffic intersection in the city, which is layered up and down, travels in multiple directions, and does not disturb each other; Whereas, a viaduct refers to a bridge with a tower or pillar with high support that spans a valley, river, road, or other low obstacle. The features are different:

The main function of the overpass is to enable vehicles in all directions to pass quickly without rolling through the traffic light control on the intersection. Viaducts are used to evacuate traffic density, improve transportation efficiency, and save land. <

1. Different definitions: overpasses are mainly land bridges that are layered up and down, multi-directional, and do not disturb each other at important traffic intersections in the city; Whereas, a viaduct refers to a bridge with a tower or pillar with high support that spans a valley, river, road, or other low obstacle.

2. Different functions: The main function of Lida only overpass is to enable vehicles in all directions to pass quickly without being controlled by traffic lights at intersections. Viaducts are used to evacuate traffic density, improve transportation efficiency, and save land.

3. Different characteristics: the plane separation or three-dimensional intersection of the overpass road forms a multi-volt noisy layer. The height of the viaduct piers is high, and the reinforced concrete row frame or single-column and double-column reinforced concrete piers are generally used.