Strengthen the side station of trenching construction, judge the geological conditions according to the rock samples taken out by the grab bucket, and take corresponding measures.
According to different corrosion conditions, the project team “suits the remedy to the case” and accurately proportioned bentonite to “block” the corrosion and karst cave.
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3ใ There is a geological fault zone under the ground of the project.
The project team adopts three strategies of “enclosure, blocking and observation”: first, it is difficult to control underground water seepage.
When the diaphragm wall crosses the fault zone, problems such as broken rock mass collapse will occur.
The total land area is about 20335 square meters and the building area is about 218153 square meters (of which the aboveground building area is about 146418 square meters, which is for commerce, office and hotel; the basement building area is about 71735 square meters).
It is planned to build two 150m super class A office buildings, Including five-star service boutique hotel, podium business; It has a four story basement.
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201, Yanjiang Road, Gulou District, Nanjing.
The project team cut the diaphragm wall into the bedrock to “enclose” the whole underground of the building to form a closed water stop curtain.
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The three strategies of “enclosure, blocking and inspection” ensure the construction quality.
The project team will explore the junction area to find out whether there is broken rock mass under the wall.
34 dewatering wells and 22 observation wells are prepared for 24 hours to ensure drainage.
The underground construction of the project is faced with “three difficulties”.
The “construction technology of 80m ultra deep underground diaphragm wall through karst geology” of the project overcomes the rare karst geological conditions in China and the complex surrounding environment near the riverside subway, and successfully completes the construction of 95 diaphragm walls through the fierce heat and wind at the top of 91 days! Whole process display of 80m ultra deep diaphragm wall construction ๐ The Nanjing Huaneng Gemini project undertaken by the third company of China Construction Second Engineering Bureau is located at No.
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A total of 95 underground diaphragm walls with 7 types and 28 kinds of groove sections are reinforced by 754 triaxial groove walls.
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The project is only 200m near the Yangtze River and the underground is muddy silty clay; The nearest distance between the red line of the project and the river crossing tunnel of Metro Line 3 is only 70m.
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2ใ The phenomenon of dissolution and cave in underground rock stratum affects the pouring of diaphragm wall, and even causes the wall to be loose and separated in serious cases.
After 91 days of hard work, the young team affiliated to China Construction Second Engineering Bureau finally completed the underground diaphragm wall project and achieved the achievement of overcoming the worst underground construction environment and the deepest underground diaphragm wall project in Nanjing (up to 80m underground).
In the future, once the foundation pit seepage takes away too much sand, it will affect the structural stability of metro tunnel.
It is adjacent to the planned Central Avenue in the north and the planned central North Road in the West.
When Huaneng Gemini stands over the Yangtze River pan, this huge project built by the third company of China Construction Second Bureau will become a dazzling pearl dotted on the Bank of the Yangtze River in the Yangtze River Delta.
