Construction method of double - wall steel cofferdam
(一) the production and installation of steel cofferdam
Generally in the construction of deep-water pier will use steel cofferdam. The use of steel cofferdam is to create conditions for deepwater foundation construction. Double-wall steel cofferdam should be designed according to the design requirements in the factory section, and in the current section of the fence positioning, sub-section installation and welding, welding should be carried out after welding quality inspection and watertight test. The bottom section with a corner angle, easy to implant in the sediment after the sink.
After the installation of the first back cover, and then by section of drainage, by section reinforcement.
(二) the tube group sink
Under normal circumstances, steel coffin back cover is completed, the next important work is drilling construction. Usually within the cofferdam drill hole is the use of group positioning after the co-located cofferdam, the group can be a variety of sunken sinks, such as:
1. All the coffers sink into the tube group.
2. Cylinder group and the first section of coffin at the same time assembled, while sinking.
(三) hanging box cofferdam construction quality control points
1. Cabinet elevation should meet the design requirements, check the inner plane size, cofferdam midline twist angle, cofferdam tilt. Such as cofferdam to do outside the mold, but also check the axis deviation.
2. Cofferdam support system should meet the overall requirements of the overall steel cofferdam and pouring bearing back cover concrete.
3. Suspension box cofferdam floor, side panels and sealing plate joints should have a reliable leak prevention measures.
4. Steel cofferdam installed in place and qualified by the supervision engineer to approve the pouring underwater undercover concrete.
5. Check the strength of the back cover concrete, when the design strength, before pumping, the next step in the construction.
Wuhu Changjiang River Bridge
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