Construction method of high-fall deepwater rock-socketed foundation

Abstract

The invention discloses a construction method of a high-fall deepwater rock-socketed foundation. The construction method comprises the following steps that when a water level is lower than a preset height, a riverbed is cleaned to form a foundation pit operation area; a double-wall steel cofferdam is assembled, a bottom tray is arranged at the bottom of a blade foot of the double-wall steel cofferdam, a bottom section steel casing and a drilling platform steel pipe pile are fixed to the inner wall of the blade foot, a temporary platform is arranged on the top of the blade foot, and blade foot concrete is poured into a wall bin; the whole double-wall steel cofferdam is put into a river through an air bag method, and the bottom tray is dismantled after preliminary positioning; after accurate positioning is conducted, the double-wall steel cofferdam sinks for implantation; construction of leaking stoppage sand bags in the bottom section steel casing and construction of bottom sealing concrete in the cofferdam are conducted, and the temporary platform is dismantled; and the steel pipe pile is heightened, a drilling platform is erected, a small-diameter tool steel casing is inserted and hit in the bottom section steel casing, drilling pile construction is conducted in the flood period, the concrete is poured into the double-wall steel cofferdam wall bin in good time, and bearing platform construction is conducted after water is pumped in the cofferdam in the dry season. The construction method is high in construction efficiency and small in drilling platform work amount; the small-diameter tool steel casing can be used inversely, so that 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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