Drilled pile drilling device suitable for determining boundary depth of upper-soil low-rock stratum

Abstract

The invention discloses a drilled pile drilling device suitable for determining boundary depth of an upper-soil low-rock stratum. The drilled pile drilling device comprises a drill stem, a drill bit,a positioning retainer ring, a soil taking sleeve, a drive rotary disc, a lower supporting platform, a driven rotary disc and a drill stem blocking head, wherein the drill stem blocking head is connected to a guide rod and extends into a hydraulic sleeve; a lifting rope on the top of the hydraulic sleeve is connected to a winch roller and an angle displacement sensor; an ultrasonic speed measureris arranged in a shielding cover; a torque sensor abuts against the drive rotary disc through a jacking screw; and the angle displacement sensor, the ultrasonic speed measurer and the torque sensor output a square wave signal through pre-amplification, band-pass filtering, a RC reshaping circuit and digital-to-analogue conversion, wherein an output signal of the ultrasonic speed measurer is connected to a buzzer and a signal lamp through a relay. Information such as rotation speed, torque and drilling depth of the drill stem during drilled pile drilling are acquired, processed and analyzed, and soil-rock boundary depth is quickly determined through an intermittent alarm signal, so that guide and basis are provided for determining stratum distribution information for enclosure pile construction of deep foundation engineering of the upper-soil low-rock stratum.

Description

technical field [0001] The invention relates to the technical field of drilling and measurement for pile foundation construction, in particular to a drilling-while-drilling device for bored piles suitable for determining the boundary depth of upper soil and lower rock formations. Background technique [0002] With the rapid development of municipal infrastructure such as subways and rainwater storage tanks in China, more and more deep foundation pit projects in upper soil and lower rock formations have appeared in Qingdao, Dalian, Xiamen and other cities, that is, the depth of the soil-rock boundary is above the basement Foundation pit engineering at a position of several meters. The upper soil and lower rock strata are the characteristics of complex composite strata composed of the upper Quaternary loose strata or fully weathered rock strata, the lower strata, and the interface (zone) of the soil-rock strata. The self-stabilization ability of the upper soil layer is poor, ...

AI Technical Summary

Problems solved by technology

[0004] At present, the drilling-while-drilling test method for bored piles is relatively complicated, and the data processing is relatively cumbersome, and there is no special equipment for drilling piles while drilling for the determination of the boundary depth of upper soil and lower rock formations.

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