Bridge bored pile hole wall opening protection method

Abstract

The invention discloses a bridge bored pile hole wall opening protection method, which is used for protecting a hole wall opening of a bridge bored pile, which is provided with a sand covering layer and a crushed rock layer. The method comprises the following steps of: a, building a construction platform; b, inserting a steel casing in the construction platform to make the steel casing embedded in the crushed rock layer; c, arranging a drilling machine on the construction platform, and pre-drilling the steel casing to form pre-bored holes; d, pulling out the drilling machine, and inserting small casings into the pre-bored holes, wherein the small casings are provided with a plurality of stop lever holes and grouting nozzles; e, arranging stop levers in the stop lever holes, and arranging grouting devices on the grouting nozzles; and f, grouting by using the grouting devices, and detaching the grouting devices after the slurry is primarily cured. A mixture of cement and water glass is adopted as a filling material, is high in strength and waterproof after being cured, blocks hidden sand flowing channels together with the small casings, and forms a tight support at the hole wall so as to ensure the stability of the whole rock in the hole opening area of the crushed rock layer; materials are convenient to obtain, and low in price; and a few pieces of mechanical equipment are needed, and the operation is simple.

Description

technical field [0001] The invention relates to a method for protecting the wall opening of a bridge bored pile hole, in particular to a method for protecting the wall opening of a bridge bored pile hole in a sandy soil covering layer and a broken rock layer. Background technique [0002] When bridge pile foundation construction is carried out in areas with sandy soil covering layer and broken rock layer, in order to prevent the river bed quicksand from flowing into the pile hole, it is generally solved by consolidating all the sandy soil covering layer between the pile foundations in the pier range. The cost of the method is too high, and it is not suitable for the cofferdam scheme that first seals the bottom and then drills the hole, and its application is limited or limited; in addition, there is also a method of driving the steel casing to the rock formation until it can no longer vibrate to prevent quicksand from pouring into the hole Among them, there are also methods ...

AI Technical Summary

Problems solved by technology

[0002] When constructing bridge pile foundations in areas with sandy soil covering layers and broken rock layers, in order to prevent river bed quicksand from flowing into the pile holes, it is generally solved by consolidating all the sandy soil covering layers between the pile foundations in the pier range. The cost of the method is too high, and it is not suitable for the cofferdam scheme that first seals the bottom and then drills the hole, and its application is limited or limited; in addition, there is also a method of driving the steel casing to the rock formation until it can no longer vibrate to prevent quicksand from pouring into the hole Among them, there are also methods of putting cement in the hole to stir or pouring underwater bottom-sealing concrete to consolidate the hole wall and plugging the quicksand channel, and even drilling the hole and then covering the steel casing to follow up the wall to block the channel, but these methods have failed. Thoroughly solve the problems of rock surface collapse and quicksand influx at the hole, which constitute a major safety hazard and bring great difficulties to the construction

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