The sea is so deep, how is the bridge built? Compared with the submarine tunnels also built in the ocean, the construction cost of the sea-crossing bridge is lower. But the sea is so deep, how is the bridge built?

Building a house requires laying a foundation. For a sea-crossing bridge, its foundation is the pier. The underwater pier is mainly composed of invisible pile foundation caps, and piers and supports on the sea.

In order to build the bridge pier, the pile foundation must be laid. At present, there are generally three methods for building the bridge pier, namely the cofferdam method, the caisson method, and the pile driving method.

First of all, it is necessary to measure the distribution of underwater rocks, the soil conditions of the seabed, and the depth of seawater, and then use different methods to build.

Today's article will answer this question for you. At present, there are generally three methods for building piers of cross-sea bridges:

1. "Turn the sea into a road" cofferdam and bridge in the shallow water area

In fact, not only do bridges need stable piers, but any building needs a solid foundation, no matter how tall or thin. The technology of engineers building onshore foundations is very mature, so when it comes to the construction of bridges across the sea.

The first thing people think about is whether it can be converted into an onshore structure and constructed, and the answer is of course yes.

2. The caisson method has low requirements for mechanization and does not affect navigation

How to pierce the piers deeply into the strata of the seabed?

A traditional method is to use a caisson. The caisson is a box-shaped structure with a top and no bottom. The lower end of the wellbore wall is provided with a blade foot, and a baffle is arranged inside, which can float in the water.

The sinking or floating of the caisson can be controlled by adjusting the ballast water in the tank. The top cover is equipped with an airlock, which is convenient for personnel, materials, and soil to enter and leave the studio while maintaining fixed air pressure in the studio.

3. The sea conditions in the deep water area are complex, and a piling ship is required to repair the bridge piers

In practical engineering, people usually try to avoid building piers in deep water areas as much as possible. The sea conditions in the deep water area are complex and the construction is difficult.

Building piers here can be said to be "thankful for the effort".If a pier has to be built in a deep water area due to problems such as route planning, then a piling ship is required.