Method and device for installing steel sheet piles in large-diameter boulder and sandstone stratum

Abstract

The invention belongs to a method and a device for installing steel sheet piles in a large-diameter boulder and sandstone stratum. The device comprises a pile casing construction measuring and positioning device, a steel sheet pile movable sample corrector and a movable operation platform. The method comprises the following steps that a steel trestle is built along the outer side of the peripheryof the designed cofferdam steel sheet piles, the movable operation platform is installed, a steel pile casing is installed in a hole jumping mode and excavated, a rotary drilling rig and a vibrating hammer are matched to excavate and guide holes in a boulder layer at the lower end of the steel pile casing till the lower end of the steel pile casing penetrates through the boulder layer, clay is backfilled into the steel pile casing, a static pressure pile planting machine is used for planting the steel sheet piles along a backfilling clay line till a steel sheet pile cofferdam is completed, andthe inclined steel sheet piles are corrected through the steel sheet pile movable sample corrector on the movable operation platform in the steel sheet pile pressing-in process. The steel sheet pileplanting speed and efficiency in the large-diameter boulder and sandstone stratum can be improved, and the cofferdam construction safety risk is reduced.

Description

technical field [0001] The invention belongs to a method and a device for installing steel sheet piles in large-diameter boulders and sandstone formations. Background technique [0002] The steel sheet pile is a support structure formed by continuous tight occlusion, and the cofferdam is a temporary closed space surrounded by steel sheet piles, which can prevent the inflow of water and soil, and ensure the smooth progress of the internal engineering construction of the cofferdam (such as bridge piers or caps, etc.) . Usually bridge piers are set on the water surface or below the river bed, and the cofferdam made of steel sheet piles can create ideal conditions for the construction of underwater caps. take advantage of. [0003] The steel sheet piles of the cofferdam in the water generally use traditional pile drivers to use their impact kinetic energy to achieve pile foundation penetration. The pile footage is slow, the rock formation at the bottom of the steel sheet pile...

AI Technical Summary

Problems solved by technology

It is very difficult for the static pressure pile machine to work in such large boulder formations. No matter whether the static pressure pile machine is drilled with an auger rod or combined with a water jet and an auger device, the effect is not ideal. It takes 3 hours for the pile to break through the boulder layer, which cannot give full play to its advantages in tight sandstone; and it is very easy to cause serious wear of the drill pipe and drill teeth, air compressor failure, and de-welding of the auxiliary welding part between the steel sheet pile and the drill pipe. As a result, piles cannot be planted, and the efficiency is low

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