Construction method of deep water pile foundation without steel pile casings

Abstract

The invention provides a construction method of a deep water pile foundation without steel pile casings. The construction method comprises the following steps that (1) a covering layer and sludge on a riverbed at a pier position are cleaned, and rock of the riverbed is completely exposed; (2) a steel cofferdam is placed downwards at the pier position; (3) underwater bottom sealing concrete is poured in the steel cofferdam, and pouring is paused when the bottom sealing concrete is poured by 50cm lower than a preset height; (4) after the bottom sealing concrete reaches the design strength, water in the steel cofferdam is completely pumped out, lofting of bored pile positions is conducted in the steel cofferdam, and meanwhile lofting of steel pipe pile positions used for setting-up of a drilling platform is conducted; (5) drill guide steel pile casings with the height of 150cm are installed at the bored pile positions, steel pipe piles are installed at the steel pipe pile positions, the scale height of the top of each steel pipe pile is arranged in the mode that the top of each steel pipe pile is flush with the top of the steel cofferdam, and then the remaining portion, with the height of 50 cm, of the bottom sealing concrete is poured; (6) lower supporting is conducted by the steel pipe piles and the steel cofferdam, and the drilling platform is set up; (7) drilling machines are placed in position to conduct drilling.

Description

technical field [0001] The invention relates to a construction method of deep-water bored piles, in particular to a large-scale bridge deep-water pile foundation construction technology using steel cofferdams. Background technique [0002] At present, all the bored piles in deep water adopt the form of full casing, and the steel casing is used as the construction auxiliary component. The specific arrangement is that the bottom opening of the steel casing should be inserted into the riverbed cover layer to a certain depth, and the top opening should be exposed to the water surface by more than 4-6m. , the main function of the steel casing is to support the drilling rig platform on the water, guide the drilling rig, drill the wall, maintain the height of the water head, and form a container for concrete pouring. Generally, there are as many as dozens of bored piles at one pier position, and each pile position requires a steel casing. Especially in deep water areas, the length ...

AI Technical Summary

Problems solved by technology

Generally, there are as many as dozens of bored piles at one pier position, and each pile position requires a steel casing. Especially in deep water areas, the length of the steel casing is required to be very long, so this construction method requires a lot of work. Steel, the cost is high, and the construction process is complicated

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