Slag salvaging cylindrical drill for drilled pile

Abstract

The invention discloses a slag salvaging cylindrical drill for a drilled pile. The slag salvaging cylindrical drill is characterized in that a cylinder is arranged, a drilling rod is arranged at a neutral axis position of the cylinder, and the top end of the drilling rod penetrates through the top of the cylinder and is provided with a flange disc; the inner part of the cylinder is separated into semi-cylindrical cylinders at two sides by a longitudinal clapboard; a bottom steel beam is arranged at the bottom of the cylinder and is at a position crossing with the bottom edge of the longitudinal clapboard, drilling teeth are arranged on the bottom steel beam at intervals, the bottom steel beam divides the semi-cylindrical cylinders into salvaging bins and storing bins, the salvaging bins are open sectors and the storing bins are sectors of which the bottoms are sealed with steel meshes; and the salvaging bins in the semi-cylindrical bins at two sides are arranged at diagonal positions. According to the invention, the phenomena of pipe plugging, hole collapse and chambered holes in the drilling construction can be effectively reduced, and the construction progress and the safety quality of a pile foundation are ensured.

Description

technical field [0001] The invention relates to an auxiliary device used in the drilling construction process of bored piles, more specifically a barrel drill used for salvaging boulders in the borehole. Background technique [0002] In the existing technology, in the construction of drilling holes in some complex geological environments, when encountering large pebbles and boulder interlayers, it is first necessary to use a percussion drill to break them up, and then use a reverse circulation drilling machine to suck out the fragments. Among them, the reverse circulation drilling rig equipment is often unable to guarantee the construction progress due to problems such as drill pipe blockage. For example, the pile foundations of the Shanxi-Shaanxi Yellow River Super Bridge on the Daxi-West Railway Passenger Dedicated Line in my country are all bored piles. The pile diameter is large, the drilling depth is deep, the engineering volume is large, the construction period is tigh...

AI Technical Summary

Problems solved by technology

However, the actual drilling slag sampling during the construction of bored piles in the Yellow River Channel confirmed that the stratum distribution was slightly deviated from the stratum description shown by the geological exploration data. Gravel and boulder layers appeared between 15m and 35m. , the footage is very difficult, often less than 10cm in 24 hours, and it is easy to get stuck

It often happens that large pebbles or boulders are sucked into the drill pipe and cause pipe plugging, which makes the mud unable to circulate and the drilling to continue

At the same time, when encountering pebbles or boulder interlayers, due to the slow drilling speed, the drill bit disturbs the hole wall for a long time. After the hole is formed, it is detected by a fully automatic ultrasonic detector. Due to the long-term disturbance of the drill bit to the hole wall, the hole reaming situation is very serious

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