"Shaqima" inserted chopsticks -the construction challenge of the Yanji Yangtze River Bridge is rare underground broken belt

The pile foundation panoramic map on the south bank of Yanji Bridge. Reporter Dai Hui

Hubei Daily All -Media Reporter Dai Hui Correspondent Zhang Yanhan Gelong

56 "Dinghai God Needle" steadily inserted into the rock formation, each with a diameter of 3.2 meters and a deepest of 76 meters ... On September 16th, with 580 cubic meters of concrete pouring to No. 14 piles, the main pile base of the south bank of the Yanji Yangtze River Bridge Completed smoothly. Here, a thrilling technical challenge has just been completed: the construction personnel successfully overcome the rare underground broken belt, and laid a solid pile foundation in the rock formation on Shakma.

The waves of the river on the river of Yanji Town, Ezhou were shore, and the south bank construction site at the south bank of the river was roaring. Among the operating venues of more than 10,000 square meters, the main tower of 86 meters long and nearly 30 meters wide was dumbbell -shaped. Model.

"Challenge the geological structure of rare fractures. It continued to stop in 196 days. Finally, the world -class bridge chassis was firmly stunned." Guan Aijun, general manager of Hubei Jiaojun Yanji Bridge, told Hubei Daily all media reporters.

The 1860 -meter -of -the -main Yanji Yangtze River Bridge invested approximately 13.7 billion yuan, and was invested by Hubei Communications Group to invest in construction and China Communications Second Airlines Bureau and other units. The pile foundation is the hard support of the world's largest double -layer suspension bridge to build a century -old quality project.

On the south bank, the pile foundation construction encounters rare "block tigers" along the Yangtze River: the main pier is located on the edge of the geological fracture belt, and it is 60 degrees arc to tilt the river side. In this way, it is easy to occur in the process of pile foundation.

Yanji Bridge Super Drilling helps pile foundation. Reporter Dai Hui

The 56 drilling piles of the main tower on the south bank range from 46 to 76 meters, 8 piles above 70 meters, and the total underground pile is 3.5 kilometers. This is very rare under the main bridge pier of the Yangtze River Bridge.

In addition, the underground broken belt also leads to unevenness of the rock strength, from the crushed Miqian rock that can be crushed to the hard -like basalt, and the drilling pile is "one hole and one change". Luo Hang compared it to "Shaqima" to insert chopsticks. Such a rare geological layer has become a difficult "hard bone" in the pile foundation.

On March 5 this year, the main piles of the pier pier on the south bank opened. In order to ensure the quality of the hole, the "One Plan" project of the China Communications Second Aviation Bureau project continued to analyze and optimize the construction technology. Luo Hang said that the drill head design was improved with scientific and technological means, and the intelligent ultrasonic high -sound pore quality detector was used to detect deep, pore diameter and verticality. The law of oblique holes appears on the top, and finally overcome technical problems.

The processing of pile foundation raw materials also flashed "gold content". The steel cage of the pile foundation comes from the advanced steel processing plant; the concrete of thousands of cubic meters will be controlled by the intelligent central control center to ensure the quality of the pile foundation.

In addition, they also introduced "Super Diamonds". The project department of Yanji Bridge Company of Hubei Jiaotou and the Second Aviation Bureau of the CCCC invested more than 20 million yuan to introduce the largest domestic rotary rotor drilling machine to participate in the main construction of the main pier pile foundation. Optimize the grading from the original five -level holes to a three -level hole, shortening the pile foundation construction time for more than two months.

"Lowering the hard bone, the project construction press the fast -forward key, the main tower on both sides of the strait is completed, and the 8 -meter -high Chengtai is expected to be completed within the year. This year, we will strive to complete the investment of 3 billion yuan." The Caring Army is full of confidence.

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