A device for measuring sediment thickness by drill bit variable pressure induction method

Abstract

The invention relates to a device for measuring the sediment thickness through a drill bit variable pressure sensing method. The device comprises an upper cover plate. A plurality of protection frames are perpendicularly arranged on the upper cover plate, a pressure sensing propelling device perpendicular to the upper cover plate is arranged on a propelling device fixing seat and connected with a control terminal, a push rod of the pressure sensing propelling device faces the upper cover plate, and a sweeping motor connected with the control terminal is arranged between the push rod and the upper cover plate. A sweeping drill bit is arranged on the sweeping motor and penetrates through the upper cover plate. In the working process, the upper cover plate is static on the upper surface of sediment, the sweeping motor is started first, then the pressure sensing propelling device is started, the motor perpendicularly moves downwards to the bottom of a hole under the action of the pressure sensing propelling device, a certain numerical value is achieved through a real-time pressure sensor (manual calibration), the pressure sensing propelling device stops working, and the advancing distance of the push rod is the sediment thickness.

Description

【Technical field】 [0001] The invention relates to an instrument for measuring sediment at the bottom of a hole, in particular to a device for measuring the thickness of sediment by a variable induction method. 【Background technique】 [0002] According to building codes and construction requirements, in order to meet the bearing capacity of cast-in-situ piles, there are strict regulations on the thickness of sediment at the bottom of the pile hole. Therefore, to ensure the quality of the pile hole, it is necessary to accurately measure the thickness of the sediment at the bottom of the hole; the existing The measuring device includes a metal measuring hammer tied at the bottom end of the measuring rope, the measuring rope is composed of a jacket layer and a core layer, the jacket layer is loosely fitted around the core layer, and the metal measuring hammer is tied at the lower end of the measuring rope core layer The lower end of the outer layer of the measuring rope is conne...

AI Technical Summary

Problems solved by technology

[0003] The present invention provides a device for measuring the thickness of sediment by the variable pressure induction method of the drill bit, so as to solve the technical problem that the above-mentioned sediment measuring instrument at the bottom of the hole adopts an approximate estimation method, which often causes large human errors in the detection results and does not have true reliability.

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