achieved major breakthrough results, and the deep-water bare rock pile foundation with the deepest deep pool of Yongning bridge was successfully poured! The water depth here is 58m, which exceeds the water depth of the pile foundation of the Hong Kong Zhuhai Macao Bridge of the century project.
On the evening of October 7, the Zhongshan West Ring project undertaken by poly Changda Engineering Co., Ltd.
The bottom of the deep tank is exposed oblique granite environment, which brings great construction difficulties and control risks to construction trestle, platform construction, pile foundation casing embedding and water hoisting operations; The dip of the rock surface on the East and west sides is close to 90 °, and it is very difficult to form holes; Moreover, the pool is not connected with the external River Basin, so it is impossible to use large-scale water construction equipment for construction.
The process of pile foundation drilling first and then lowering the anchored steel casing is adopted.
No.
2-6 bridge of AB ramp crosses the condensation tank of Yongning power plant.
The successful pouring of the first deep-water pile foundation concrete has verified the scientificity of the construction organization scheme, accumulated valuable experience for the subsequent deep-water pile foundation construction, and will greatly accelerate the construction progress of the control project…
In the area with a water depth of more than 50m, the method of transporting the assembled single floating tank to the site and assembling the integral floating water construction platform is adopted for construction.
Poly Changda construction team has repeatedly studied and demonstrated, optimized the construction organization scheme, and used the method of High Pile Trestle to build a drilling platform for underwater pile foundation construction in the area with a water depth of less than 50m.
The maximum pile diameter is 2.5m and the longest pile length is 65m.
There are 79 pile foundations in Yongning deep pool, including 34 in deep water area.
Yongning hub interchange is one of the key and difficult control projects of the whole line of Zhongshan West Ring Road.
The pile foundation construction process adopts clean water percussion drilling, pile foundation drilling, reverse circulation hole cleaning, slag fishing, drilling and pouring construction.
After the pile foundation construction in the trestle area is completed, the steel casing is used to form anchor piles to increase the stability of the trestle.
