Extra-deep hole drilling and fast slag tapping construction method

Abstract

The invention relates to an extra-deep hole drilling and fast slag tapping construction method, which is carried out according to the following steps: (1) connecting a plurality of steel pipes through flanges; (2) welding a conical opening for collecting settled slag at the bottom sections of the connected steel pipes, and connecting a high-pressure rubber host on the bottom sections of the steel pipes; (3) welding a slurry recovery box on a hole drilling platform; (4) extending the tail end of the steel pipe onto a sieve arranged above the slurry recovery box, and connecting the high-pressure rubber host to an air compressor; and (5) installing, connecting and down placing the steel pipes and the high-pressure rubber hose according to the depth of holes, hanging the steel pipes by a hoisting machine arranged on a percussion drill, opening an air valve of the air compressor so that high-pressure air fast rises along the steel pipes after reaching the steel pipes at the bottom of the hole along the high-pressure rubber hose, forming pressure difference in the steel pipes, floating the settled slag at the bottom to an hole opening, and then, using the slurry recovery box for recovering the slurry for reutilization. The invention accelerates the hole forming speed, shortens the construction work period, recovers the slurry, saves the cost, and protects the construction environment.

Description

Technical field: The invention relates to a construction method for long and deep hole pile foundations, in particular to a construction method for quick slag discharge from ultra-deep boreholes. Background technique: With the continuous improvement of the design and construction level of deep-water bridges, there are more and more pile foundation designs and constructions for deep-water bridges in rock formations. Due to the ultra-deep water, the length of the bored pile in the water (the free length of the pile foundation) is too long, so the rock-socketed pile foundation is very deep. The domestic drilling method is still the method of forming holes with a gravity impact hammer. The dregs of the holes are all adopted the positive circulation scum method, and the rock particles are floated from the bottom of the hole to the hole opening through the mud with a large specific gravity, and the slag is removed by filtering and settling. However, because the hole is too deep an...

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Problems solved by technology

Due to the ultra-deep water, the length of the bored pile in the water (the free length of the pile foundation) is too long, so the rock-socketed pile foundation is very deep. The domestic drilling method is still the method of forming holes with a gravity impact hammer. The dregs of the holes are all adopted the positive circulation scum method, and the rock particles are floated from the bottom of the hole to the mouth of the hole through the mud with a large specific gravity, and the slag is removed by filtering and settling. The flow rate is very slow, and the effect of scum removal is very poor, which directly leads to a decrease in the hole forming speed (even if the mud pump is increased, the effect is not obvious)

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