Wave-web fore-shaft steel casing device and construction method thereof

Abstract

The invention discloses a wave-web fore-shaft steel casing and a construction method thereof and belongs to the field of bridge foundation construction. The wave-web fore-shaft steel casing device comprises an annular steel casing formed by splicing of a plurality of wave webs end to end, fore-shaft mechanisms are arranged on both the heads and the tails of the wave webs, the every neighboring wave webs are connected through the fore-shaft mechanisms, a horizontal ring beam at least fixedly provided with an upper layer and a lower layer is detachably connected with the inner wall of the steel casing, the horizontal ring beam is close to the top of the steel casing, and lugs are arranged on the upper-layer horizontal ring beam. The construction sequentially includes the steps: assembling the pre-prepared wave webs into the steel casing on a construction site; adding the horizontal ring beam to the steel casing; using a vibratory hammer to have the steel casing vibrated in place after integral lifting is in place, removing a horizontal ring beam system, and performing drilled pile construction; pulling up the wave webs one by one for recycling when the drilled pile construction is completed. The wave-web fore-shaft steel casing and the construction method thereof aim at the drilled pile oversized in diameter, so that convenience in construction is achived, and cost is lower.

Description

technical field [0001] The invention belongs to the field of bridge foundation construction and is suitable for super large bored pile foundation construction in water. Background technique [0002] 1) Construction technology of traditional piles in water: [0003] Steel casing is in the process of pile foundation construction, due to the instability of the soil, it is difficult to construct reinforced concrete wall, so the steel wall is used to protect the hole pile, prevent the hole from collapsing and avoid affecting the construction progress and safety. structure. It has the functions of stabilizing the hole wall, preventing hole collapse, forming mud pressure, isolating surface water, guiding the drill bit, fixing the pile position, and protecting the original ground during operation. The steel casing is an important structure in the bridge bored pile foundation. The traditional steel casing is rolled on site or in a factory with a certain thickness of steel plate. ...

AI Technical Summary

Problems solved by technology

[0005] When the traditional construction technology uses steel casings for construction, after the pile foundation construction is completed, the steel casings cannot be recycled, resulting in great waste; , the wall thickness of the casing should reach the diameter-thickness ratio of 1 / 120, so the traditional construction technology is only suitable for the steel casing with a smaller diameter of the bored pile. When the pile diameter exceeds 2.4 meters and the casing wall thickness is greater than 30mm, the casing is rolled The difficulty will be greatly increased, which will greatly increase the processing, transportation and hoisting of the steel casing, and the construction difficulty will also be greatly increased during the construction vibration sinking process.

It can be seen that the traditional technology has certain limitations, especially in the construction process of large-diameter piles.

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