Device and method for detecting thickness of sediments at bottom of drilling hole based on hardness difference sensing
A technology of sediment thickness and detection device, applied in the directions of measurement, earthwork drilling, wellbore/well components, etc., can solve the problems of weak reflected wave signal and inappropriate identification, etc.
Active Publication Date: 2012-09-12
武汉岩海工程技术有限公司
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Problems solved by technology
Therefore, the reflected wave signal picked up by the receiving sensor is very weak, which is not suitable for identification
In addition, the speed of sound waves propagating in the sediment is mainly determined by manual experience, which will also bring large errors
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[0070] Below in conjunction with accompanying drawing and embodiment the present invention is described in detail:
[0071] 1. Overall structure
[0072] Such as Figure 4.1 , 4.2 , the device includes a detection instrument 00 and a winch 100 on the ground;
[0073] A downhole sensor is provided; the downhole sensor consists of a mechanical probe rod 10, a circular chassis 20, an elongated cylinder 30, a linear stepping motor 40, a connecting wire 50, a circuit board 60, a cable socket 70, a multi-core cable 80 and a sealing ring 90 composition;
[0074] Its location and connection relationship are:
[0075] A sealing ring 90 and a cable socket 70 are arranged on the upper part of the elongated cylinder 30;
[0076] Inside the elongated cylinder 30, a mechanical probe rod 10, a linear stepper motor 40, a connecting wire 50 and a circuit board 60 are arranged;
[0077] A sealing ring 90 and a circular chassis 20 are provided at the bottom of the elongated cylinder 30;
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The invention discloses a device and a method for detecting the thickness of sediments at the bottom of a drilling hole based on hardness difference sensing, relating to the detecting technology of building engineering. The device comprises a detecting instrument (00) and a winch (100) on the ground, and is provided with a downhole sensor, wherein the downhole sensor comprises a mechanical probe (10), a round chassis (20), a long drum (30), a linear stepping motor (40), a connecting wire (50), a circuit board (60), a cable socket (70), a multi-core cable (80) and a sealing ring (90). The method is realized by utilizing larger difference of sediments, mud and natural soil on hardness. The device is simple and intuitive, is easily understood and realized and is flexible and applicable. Since the detecting accuracy of the thickness of sediments at the bottom of the drilling hole is improved, the invention is applicable to being widely applied to detecting the thickness of sediments at the bottom of the drilling hole in the building engineering.
Description
technical field [0001] The invention relates to construction engineering detection technology, in particular to a device and method for detecting the thickness of sediment at the bottom of a borehole based on hardness difference sensing. Background technique [0002] Bored pile is one of the common forms of foundation pile in construction engineering. Its function is to transfer the load of the superstructure to the deep stable soil layer or rock layer. The construction of bored piles is divided into two stages: "drilling" and "pouring concrete" into the borehole. The quality of drilling is directly related to the quality of foundation pile formed after pouring concrete. If the sediment at the bottom of the borehole is too thick, the length of the foundation pile will be reduced; especially for the foundation pile whose main load is at the bottom end, its bearing capacity will be directly affected, which may cause unevenness between foundation piles Settlement, which in tu...
Claims
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Inventor 杨燕军杨光
Owner 武汉岩海工程技术有限公司