A construction method for deep-water rock-socketed foundation with high drop

Abstract

The invention discloses a construction method of a high-drop deep-water rock-socketed foundation. When the water level is lower than a predetermined height, the river bed is cleared to form a foundation pit operation area; a double-wall steel cofferdam is assembled, and the bottom of the blade foot of the double-wall steel cofferdam The bottom tray is set, the inner wall is fixed with the bottom section steel casing and the steel pipe pile of the drilling platform, and the top is provided with a temporary platform, and the wall warehouse is filled with concrete with blade feet; the double-wall steel cofferdam is put into the river as a whole by the air bag method, After preliminary positioning, the bottom tray is removed; after precise positioning, the double-walled steel cofferdam is sunk and planted on the bed; construction of sand bag plugging in the steel casing of the bottom section, bottom sealing concrete construction in the cofferdam, removal of the temporary platform; connection of high steel pipe piles, Set up a drilling platform, insert a small-diameter tool steel casing into the steel casing of the bottom section, carry out bored pile construction during the flood period, pour concrete into the double-wall steel cofferdam wall bin in a timely manner, and carry out bearing work after pumping water in the cofferdam during the dry season. platform construction. The construction efficiency of the method is high, and the engineering quantity of the drilling platform is small; the small-diameter tool steel casing can be used backwards, and the construction cost is low.

Description

technical field [0001] The invention relates to foundation construction of bridge engineering, in particular to a construction method of a high-drop deep-water rock-socketed foundation. Background technique [0002] In the existing bridge foundation construction, one of the commonly used methods for rock-socketed piles is to use a drilled platform to construct bored piles, and then use steel casings to lower the cofferdam to carry out cap platform construction. If the safety flood conditions are met, the drilled platform structure The engineering volume is huge; the other is the positioning of the floating cofferdam, which uses the cofferdam to insert the steel casing, hangs the cofferdam piles to the steel casing, and uses the inner support of the cofferdam as a drilling platform for the construction of bored piles. Then the cofferdam is sunk into the bed to carry out the cap platform construction. Due to the large diameter of the steel casing, it is difficult to insert and...

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problems of high construction difficulty and high risk in the prior art, the present invention provides a construction method for a high-drop deep-water rock-socketed foundation, which has a small amount of drilling platform, short construction period and low cost

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