Scared the Padma Bridge of 24 countries

  Known as the “Bridge of Dreams”, the Padma Bridge is the largest infrastructure project invested in Bangladesh in recent years. The Padma Bridge is located in the lower reaches of the Padma River, with a total length of 9.83 kilometers, and the main bridge is 6.15 kilometers long. The upper layer of the Padma Bridge is a two-way four-lane expressway, and the lower layer is a single-track railway shared by passengers and freight, with a total investment of 3 billion US dollars (about 20 billion yuan). The main project of the project includes the main bridge construction project with a total length of 6.15 kilometers and the river regulation project with a total length of 13 kilometers, which were respectively awarded by China Railway Bridge Bureau Group Co., Ltd. and China Power Construction Group. At that time, a total of 25 countries participated in the bidding, but the other 24 countries voluntarily gave up bidding because the project was too difficult. Many European bridge experts shook their heads and said that it is impossible to build bridges on muddy ground.
  So, how difficult is it to build the Padma Bridge, so that 24 countries are discouraged? The reason why the Padma Bridge is difficult to build has a lot to do with the special geographical environment of Bangladesh. The Padma River is a typical impact zone, with loose soil, no hard rocks on the river bed, and very fast water flow. Even building bridge piers on such terrain is a big problem, let alone building a 6.15-kilometer-long double-layer steel truss bridge.
  To build the Padma Bridge, the first is to face the difficulty of bridge stability. Experts from China Railway Major Bridge Bureau Group Co., Ltd. decided to use steel pipe piles as the main pier. Each main pier consists of six steel piles with a diameter of 3 meters, a length of 120 meters, and a weight of 550 tons. In order to ensure that the steel piles are driven into the mud and maintain absolute stability, China Railway Bridge Bureau Group Co., Ltd. has specially manufactured a super-powerful hydraulic piling hammer, and creatively used a new piling method, which combines both concrete and steel piles. A soil plug is set in between to form a miniature cap, so that 130 steel piles can be stably inserted in the silt of the river, as firm as a sea god needle. This piling method overcomes the problems of soil looseness and river impact. Compared with the traditional piling method adopted by the German MENCK company, it has significant advantages in terms of efficiency and capital cost.
  Secondly, it is difficult to transport steel beams. The main structure of the Padma Bridge is a steel truss structure with a total of 41 spans, each of which is 150 meters long and weighs 3,200 tons. It is not easy to transport such a heavy steel girder to the pier. thing. China Railway Major Bridge Bureau Group Co., Ltd. transferred from China the self-developed “Tianyihao” crane ship. “Tianyihao” was the most advanced crane ship in China at that time, not only with a maximum lifting weight of 3,600 tons, but also with self-propelled capability. The addition of “Tianyi No. 1” has ensured that these steel beams can be erected to the designated position precisely at one time.
  Once again, it is difficult to face errors in the welding of steel beams. During welding, once there is a large error in the 150-meter-long steel beam, it will lead to the consequence of “a slight difference, a thousand miles away”. In order to avoid large errors when welding steel girders, Chinese builders use the latest high-tech – GPS observers, and strive to achieve zero errors.
  Finally, it is difficult to deal with excess sediment. The excess silt produced by river regulation is enough to fill four West Lakes. In order to deal with these excess silt, Chinese builders are ingenious, adapt measures to local conditions, use the water of the river, and transport the excess silt through pipelines to the mud discharge field 5 kilometers away.
  Of course, there are still many difficulties during the construction of the Padma Bridge, but there are always more methods than difficulties. No matter how many difficulties there are, they have been overcome one by one by the Chinese builders.
  With the completion of the Padma Bridge, China’s infrastructure has completely established its reputation in the Southeast Asian market. This bridge not only solves the long-term infrastructure construction problems for Bangladesh, but also provides a new channel for the connection between Dhaka, the capital of Bangladesh, and the southwest region. In the future, it will only take about half an hour for goods from the southwest region to be transported to the capital Dhaka. .
  The construction of the Padma Bridge has not only greatly improved China’s competitiveness in the Southeast Asian infrastructure market, but also the various experiences explored during the construction of the Padma Bridge will be widely used in China’s domestic bridge construction. It is believed that in the near future, China will build more world-class bridges.

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