In order to optimize the cofferdam construction scheme, the project department held special meetings for many times and decided to adopt the cofferdam installation scheme of island construction to change the water construction into land construction, which greatly reduced the risk and difficulty of construction and improved the project progress.
Because one side is close to the mountain, the asymmetric “U” shaped double wall steel cofferdam structure is adopted in the design, and the cofferdams at both ends connected with the mountain are of reinforced concrete structure, so as to achieve the purpose of fully and firmly combining the cofferdam with the mountain.
The total length of the bridge is about 11.9 kilometers, of which the main span is designed as a cable-stayed suspension cable cooperation system of 988 meters.
The total length of the cofferdam is 262.1 meters, including 129 meters of the upstream surface, 52 meters of the downstream side and 81.1 meters of the upstream side, covering an area of 1036 square meters, which is equivalent to the size of two and a half basketball courts.
The side plate of steel cofferdam adopts double wall structure, and the top layer is single wall side plate.
The vertical compartment plate is set in the wall, which is a fully welded watertight structure.
The upper deck of the bridge is arranged as a 6-lane Expressway with a design speed of 100 kilometers per hour.
4 pier cofferdam, the project department adheres to the large-scale hoisting inspection and visa system and the leadership shift system, and defines the responsibility to each person, which provides a strong support for the safe and controllable hoisting operation of No.
Disclaimer:.
The lower deck is arranged as 4-line railway, two of which are Hechi intercity railway, with a design speed of 250km / h; The other two lines are Tongling South jiangbeigang railway, which extends to Zongyang in the later stage and connects Anqing, with a design speed of 120 kilometers per hour.
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G3 Tongling Yangtze River Highway and railway bridge is the world’s first double-layer cable-stayed suspension bridge.
This time, the construction of the bottom section cofferdam with a height of 8m is completed.
The cofferdam of pier 4 is composed of 11 sections.
It is reported that the cofferdam of pier 4 of the bridge is constructed in three layers and raised twice.
4 pier cofferdam.
The rest are steel structure and expanded foundation sections, that is, the steel cofferdam, which is an integral steel shell composed of inner and outer wall plates, vertical stiffeners and horizontal annular trusses.
On the evening of February 6, the construction of the cofferdam at the bottom section of pier 4 of G3 Tongling Yangtze River Highway and railway bridge was completed, which not only won valuable time for the rapid construction of pier 4, but also created necessary conditions for the next cushion cap construction.
It is understood that during the construction of No.
