CN102661143B - Device and method for detecting thickness of sediments at bottom of drilling hole based on hardness difference sensing - Google Patents
Device and method for detecting thickness of sediments at bottom of drilling hole based on hardness difference sensing Download PDFInfo
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- CN102661143B CN102661143B CN201210158246.2A CN201210158246A CN102661143B CN 102661143 B CN102661143 B CN 102661143B CN 201210158246 A CN201210158246 A CN 201210158246A CN 102661143 B CN102661143 B CN 102661143B
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Abstract
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
The present invention relates to construction work detection technique, relate in particular to a kind of foot of hole sediment thickness checkout gear and method thereof based on nonhomogeneous hardness sensing.
Background technology
Bored pile is one of foundation pile form common in construction work, and its effect is that the load of top-out structure is delivered in deep stability soil layer or on lithosphere.The construction of bored pile be divided into " boring " and to boring in " concrete perfusion " two stages.The quality of drilling quality is directly connected to the pile quality forming after concrete perfusion.If foot of hole sediment is blocked up, can make Under Pile length reduce; Especially to taking bottom end load as main foundation pile, its supporting capacity will be subject to direct impact, likely cause producing between foundation pile differential settlement, and then bring the potential safety hazard of top-out structure.
" technical code for building pile foundation " (the industry standard JGJ94-2008 of the People's Republic of China (PRC)) 6.3.9 bar specifies: after the construction of boring completes, the thickness of tackling foot of hole sediment before concrete perfusion detects, its result should meet following requirement, processes otherwise should carry out hole clearly.
1, type stake is held in opposite end, should not be greater than 50mm;
2,, to the stake of friction type, should not be greater than 100mm;
3,, to resistance to plucking, horizontal force resistant stake, should not be greater than 200mm.
Foot of hole sediment is mainly caused by construction.As shown in Figure 1, after construction, conventionally there is mud layer 3, sediment layer 2 and former soil layer 1 in boring 6 bottoms.
The sediment thickness detection method using at present mainly contains drop weight method, electrical parameter method (resistivity or electric capacity) and sonic method.
One, plummet method
It detects principle and sees Fig. 2.Testing tool is a taper plummet 8, and its top connects lining rope 7.Plummet 8 holes 6 by manually putting into, and judges with people's feel whether plummet 8 arrives the surface of sediment 2; Now determine the depth value h in Fig. 2 according to the scale on lining rope 7; Then rely on the deadweight of plummet 8 to make its bottom that arrives boring 6, then determine drilling depth value H in Fig. 2; Calculate the one-tenth-value thickness 1/10 that (H-h) is sediment 2.
The method is simple, with low cost; But determining entirely with subjective sensation of sediment surface location, error is larger.
Two, electrical parameter method
The method is to utilize the electrical property difference that different medium exists to detect sediment thickness, and for example water, mud and sediment have different resistivity and capacitance.Concrete grammar is: first the downhole sensor that measurement electrode is installed is placed to foot of hole, now determines drilling depth value H; Then winding shaft lower sensor upwards detects the electrical quantity of the other medium of measurement electrode of downhole sensor, in its outcome record detecting instrument on the ground simultaneously in this process.When downhole sensor is upward through sediment surface and while entering mud layer, electrical parameter values presents variation.The curve that Fig. 3 demonstrates is a kind of comparatively ideal situation, and for example, when electrical parameter values (resistivity) sharply changes, corresponding depth value h is the position on sediment surface.Same calculate (H-h) is sediment thickness value.
Conventionally drilling construction need coordinate the operation of water filling ability, and the moisture content of sediment layer is conventionally higher, and water is larger on the electrical property impact of medium, and this makes at sediment surface location place, and electrical parameter values presents phenomenon jumpy and is not prone to.In addition, in the time that downhole sensor is positioned at a certain degree of depth, the medium in the other certain area coverage of measurement electrode all will affect measurement result: medium ionization electrode more affects greatlyr in theory, more affects less; Therefore the electrical parameter values that obtained should be the whole result of the electrical parameter values of media after weighted average in this regional extent.This average effect has weakened the variation of the electrical parameter values at sediment surface location place, thereby has increased the difficulty of definite sediment surface location.
Three, sonic method
The interface that sound wave runs into different medium formation in the air can produce reflection, and reflected intensity depends on the wave impedance difference of two ends, interface medium, and difference more reflects stronger.Sonic method uses a pair of acoustic emission and receiving sensor, and is arranged on water-filled boring top.Sonic sensor is connected by cable with ground signal recorder.Emission sensor is launched sound wave to foot of hole; When sound wave is transmitted to sediment when surface downwards, a part of sound wave produces receiving sensor reflect and be installed in boring top and picks up, and remaining sound wave continues to be transmitted to the former soil layer of foot of hole downwards, and produces secondary reflection, is received equally sensor and picks up.On signal recorder, calculate the time difference t of twice acoustic reflection, if the speed that known sound wave is propagated in sediment layer is v, calculates product vt and be sediment thickness value.
The application of the method is subject to larger limitation.First the water quality in boring is more mixed, is full of mud particle, and the phenomenons such as scattering, diffraction easily occur when Acoustic Wave Propagation, causes sound wave to relay the excessive attenuation of energy; Secondly, the mud balance of sediment layer top is higher, the fuzzy wave impedance interface of sediment surface location.At foot of hole, the wave impedance difference of sediment and original soil medium is also also little.Therefore the reflection wave signal that receiving sensor picks up is very faint, should not identify.In addition, the speed that sound wave is propagated in sediment mainly determines by artificial experience, and this also can bring larger error.
Summary of the invention
Object of the present invention is just to overcome the limitation of prior art, and a kind of foot of hole sediment thickness checkout gear and method thereof based on nonhomogeneous hardness sensing is provided.
The object of the present invention is achieved like this:
One, the foot of hole sediment thickness checkout gear (abbreviation device) based on nonhomogeneous hardness sensing
This device comprises ground detecting instrument and winch;
Be provided with downhole sensor; Downhole sensor is made up of mechanical feeler lever, circular base plate, microscler cylinder, linear stepping motor, connection wire, circuit board, cable socket, multicore cable and sealing ring;
Its position and annexation are:
Be provided with sealing ring and cable socket on the top of microscler cylinder;
Be provided with mechanical feeler lever, linear stepping motor, connection wire and circuit board in the inside of microscler cylinder;
Be provided with sealing ring and circular base plate in the bottom of microscler cylinder;
The upper end of machinery feeler lever is connected with linear stepping motor, and the lower end of mechanical feeler lever passes sealing ring, and can stretch out from the central hole of circular base plate;
In microscler cylinder interior, by connecting wire, cable socket, circuit board and linear stepping motor are connected successively;
One end stube cable socket of multicore cable, the other end of multicore cable connects ground detecting instrument by winch.
Two, the foot of hole sediment thickness detection method (abbreviation method) based on nonhomogeneous hardness sensing
This method utilizes sediment, mud and original soil in hardness, to exist larger otherness to realize.
This method comprises the following steps:
1. operation detection instrument, confirms that mechanical feeler lever gets back to home position, i.e. the lower end of mechanical feeler lever contracting retreats in the centre bore of circular base plate;
2. downhole sensor is placed in boring, relies on circular base plate to stand on foot of hole sediment surface;
3. read depth value now by detecting instrument, be the depth location h on sediment surface, bottom;
4. operation detection instrument makes mechanical feeler lever extend out to a ultimate range (for example 200mm); Stretch out in process at mechanical feeler lever, recorded the angle of slope of the corresponding downhole sensor of each outreach by detecting instrument, the axis direction of microscler cylinder is with respect to the angle of gravity direction;
5. on the curve changing with mechanical feeler lever outreach at the angle of slope of downhole sensor, determine corresponding distance value when angle of slope starts sharply to change, be the depth location H of the bottom surface (or former soil layer surface) of foot of hole sediment;
6. calculating foot of hole sediment thickness is H-h.
The present invention has following advantages and good effect:
1. the novel science of thinking of the present invention
Have mud, sediment and former soil layer at foot of hole, and they has larger otherness in hardness; The present invention utilizes this larger otherness, has proposed the technical program, thereby has improved the accuracy that foot of hole sediment thickness detects.
2. this device is easy to realize, and is suitable for flexibly
Rely on circular base plate, downhole sensor stands on the surface of foot of hole sediment layer, to determine its depth location; For adapting to the sediment layer of different hardness, circular base plate design can adopt different thickness, and is divided into entity and empty body region, to control the weight of circular base plate, and and the contact surface area of sediment layer.
3. this method simple, intuitive, and should be readily appreciated that.
4. the present invention is applicable to the extensive use that in construction work, foot of hole sediment thickness detects.
Brief description of the drawings
Fig. 1 is medium schematic diagram in boring;
Fig. 2 is plummet method schematic diagram;
Fig. 3 is electrical parameter method curve map;
Fig. 4 .1 is the working environment schematic diagram of this device;
Fig. 4 .2 is the structural representation (side-looking) of this device;
Fig. 5 is the workflow diagram of Industry Control computer applications software;
Fig. 6 is mechanical feeler lever structural representation (side-looking);
Fig. 7 is circular base plate structural representation (overlooking);
Fig. 8 is circuit board functional-block diagram.
In figure:
1-original soil (layer); 2-sediment (layer); 3-mud (layer); 4-mixed water (layer);
5-ground; 6-boring; 7-lining rope; 8-plummet;
00-detecting instrument
10-mechanical feeler lever, 11-cylindrical stock, 12-conical termination;
20-circular base plate, 21-centre bore, 22-entity area, 23-empty body region;
30-microscler cylinder;
40-linear stepping motor;
50-connection wire;
60-circuit board, 61-ARM single-chip microcomputer, the accelerometer at 62-measurement angle of slope,
63-serial converter, 64-DC stepper motor driver;
70-cable socket;
80-multicore cable;
90-sealing ring;
100-winch.
Detailed description of the invention
Below in conjunction with drawings and Examples to the detailed description of the invention:
One, general structure
As Fig. 4 .1,4.2, this device comprises ground detecting instrument 00 and winch 100;
Be provided with downhole sensor; Downhole sensor is made up of mechanical feeler lever 10, circular base plate 20, microscler cylinder 30, linear stepping motor 40, connection wire 50, circuit board 60, cable socket 70, multicore cable 80 and sealing ring 90;
Its position and annexation are:
Be provided with sealing ring 90 and cable socket 70 on the top of microscler cylinder 30;
Be provided with mechanical feeler lever 10, linear stepping motor 40 in the inside of microscler cylinder 30, connect wire 50 and circuit board 60;
Be provided with sealing ring 90 and circular base plate 20 in the bottom of microscler cylinder 30;
The upper end of machinery feeler lever 10 is connected with linear stepping motor 40, and the lower end of mechanical feeler lever 10 passes sealing ring 90, and can stretch out from the centre bore of circular base plate 20 21;
In microscler cylinder 30 inside, by connecting wire 50, cable socket 70, circuit board 60 and linear stepping motor 40 are connected successively;
One end stube cable socket 70 of multicore cable 80, the other end of multicore cable 80 connects ground detecting instrument 00 by winch 100.
Two, functional part
1, detecting instrument 00
Detecting instrument 00 is a kind of general secondary meter; The internal construction of detecting instrument 00 mainly includes: general touch shows liquid crystal display, universal industrial control computer and communicating circuit plate.
Touch demonstration liquid crystal display and accept instruction or the parameter of user's input, show testing result;
Industry Control computer moves independently developed application software, storage testing result;
Communicating circuit plate completes the communication function with downhole sensor.
Detecting instrument 00 carries out data communication by multicore cable 80 and downhole sensor, the lifting of control well lower sensor in boring, and the stretching out or contract and move back of mechanical feeler lever 10; The curve that under final entry, the angle of slope of downhole sensor changes with mechanical feeler lever 10 outreach.
As Fig. 5, the workflow that described Industry Control computer moves independently developed application software comprises the following steps:
1. work and start A;
2. initiation parameter: the step pitch a that mechanical feeler lever stretches out forward at every turn, and mechanical feeler lever adds up the range b B stretching out;
3. by the stube cable of connecting downhole sensor, transfer downhole sensor C;
4. according to stube cable pine or tightly judge whether downhole sensor arrives sediment layer surface; If stube cable fluffs, represent "Yes", forward next step to; Otherwise forward previous step to, continue to transfer downhole sensor D;
5. stop transferring downhole sensor E;
6. do you judge that mechanical feeler lever is at initial position (in circular base plate centre bore)? "No" if, forwards next step to; "Yes" if, forwards 8. F of step to;
7. mechanical feeler lever is got back to initial position G;
8. mechanical feeler lever accumulative total outreach counter O reset, x=0 H;
9. mechanical feeler lever outreach a forward, and count mechanical feeler lever accumulative total outreach counter x, that is: x=x+a I;
10. record corresponding downhole sensor angle of slope J;
whether does the accumulative total outreach that judges mechanical feeler lever reach range b, i.e. x>=b? "Yes" if, forwards next step to; "No" if, forwards 9. K of step to;
machinery feeler lever stop motion L;
machinery feeler lever is got back to initial position M;
change curve between mechanical graphics feeler lever outreach and corresponding downhole sensor angle of slope; On this curve, when downhole sensor angle of slope sharply changes, corresponding mechanical feeler lever outreach, is sediment layer thickness N;
winding shaft lower sensor is to ground O;
end-of-job P.
2, mechanical feeler lever 10
As Fig. 6, mechanical feeler lever 10 is made up of cylindrical stock 11 and conical termination 12.
When machinery feeler lever 10 moves downward in sediment layer 2, the end that conical termination 12 need overcome in sediment layer 2 holds resistance, and this change in resistance is little; In cylindrical stock 11 sides, need overcome the side friction with sediment layer 2 simultaneously.Because the size of side friction is directly proportional to the contact area of cylindrical stock 11 and sediment layer 2, therefore this resistance will become gradually large in mechanical feeler lever 10 moves downward process.For reducing mechanical feeler lever 10 at the interior suffered resistance of sediment layer 2, the design of conical termination 12 makes increasing suddenly with the cross-sectional area of cylindrical stock 11 junctions, cause side friction factor to reduce, thereby whole resistance mainly concentrate on conical termination 12.Finally, in the time that mechanical feeler lever 10 arrives former soil layer 1, end holds resistance and increases suddenly, and moving downward of mechanical feeler lever 10 stops, and downhole sensor starts to tilt.
3, circular base plate 20
As Fig. 7, circular base plate 20 is provided with centre bore 21, entity area 22 and empty body region 23.
When first downhole sensor is placed into boring 6 when interior, it relies on circular base plate 20 to stand on sediment layer 2 surface.The size of entity area 22 and thickness determine weight and the surface area of whole circular base plate 20.According to the hardness difference of boring 6 bottom sediments 2, can suitably choose size and the thickness of entity area 22, to ensure that circular base plate 20 just contacts with sediment layer 2 surface, and contact area is suitable, avoid occurring that circular base plate 20 is owing to too gently cannot arriving sediment layer 2 surface (still in mud layer 3), or invade below sediment layer 2 surface due to too heavy.
4, microscler cylinder 30
The oversheath pipe that microscler cylinder 30 is downhole sensors, adopts stainless steel material.In boring 2 complete water-filling in the situation that, if 100 meters of hole depths, this oversheath pipe will bear the water pressure of 1MPa, and normal work that can assurance device.
5, linear stepping motor 40
Linear stepping motor 40 is a kind of general parts, selects linear stepping motor 40 to be connected with mechanical feeler lever 10; Produce drive current by circuit board 60, drive linear stepping motor 40 can complete forward or reverse, and then driving mechanical feeler lever 10 stretches out or contracts and move back.
6, connect wire 50
For connecting cable socket 70, circuit board 60 and the linear stepping motor 40 in microscler cylinder 30.
7, circuit board 60
As Fig. 8, circuit board 60 is made up of accelerometer 62, serial converter 63 and the DC stepper motor driver 64 at ARM single-chip microcomputer 61, measurement angle of slope;
Accelerometer 62, serial converter 63 and the DC stepper motor driver 64 of measuring angle of slope are connected with ARM single-chip microcomputer 61 respectively.
The operating principle of circuit board 60:
By serial converter 63, ARM single-chip microcomputer 61 is accepted to send testing result from the operational order of detecting instrument on ground 00 or to detecting instrument 00;
By measuring the accelerometer 62 at angle of slope, can detect the angle of slope of downhole sensor, and be admitted in ARM single-chip microcomputer 61;
ARM single-chip microcomputer 61 drives linear stepping motor 60 by DC stepper motor driver 64, to control stretching out or contracting and move back of mechanical feeler lever 10.
(1) ARM single-chip microcomputer 61
Select the LPC2114 of Philips company.
(2) accelerometer 62 at measurement angle of slope
Select the ADIS16003 of Analog Device company, its 4 holding wires (MOSI, MISO, CLK, CS) by SPI interface are connected with ARM single-chip microcomputer 61;
(3) serial converter 63
Select the MAX488 of MAXIM company, its effect is by RS-232 serial ports (TXD, RXD; Or DI, RO) convert RS-488 serial ports (A, B, Z, Y) to, so that the transmission of long line.
(4) DC stepper motor driver 64
Select the UIM24002 of Shanghai You Aibao company.Signal P0, P1 by ARM single-chip microcomputer 61 by its I/O mouth and P2 control respectively direction signal (DIR), frequency signal (STP) and the enable signal (EN) of DC stepper motor driver 64, finally produce two-phase drive current (A+, A-, B+, B-) be delivered to linear stepping motor 40.
8, cable socket 70
Cable socket 70 is a kind of general parts; Connect the signal in microscler cylinder 30.
9, multicore cable 80
Multicore cable 80 is a kind of general parts; Its stube cable socket 70, and signal is delivered to detecting instrument 00 on ground.
10, sealing ring 90
Sealing ring 90 is a kind of general parts; For the sealing of microscler cylinder 30.
11, winch 100
Winch 100 is a kind of general parts; Can adopt manual or motor driving.
Three, operating principle
This device is by utilizing sediment 2, mud 3 and original soil 1 to exist larger otherness to realize in hardness.
Machinery feeler lever 10 one end connect the linear stepping motor 40 of microscler cylinder 30 inside, and the other end can, through the centre bore 21 of circular base plate 20, stretch out or contract and move back under the control of circuit board 60.After the downhole sensor of this device stably stands on sediment 2, sediment thickness detects and starts.Now ground detecting instrument 00 sends instruction, notifies the circuit board 60 in microscler cylinder 30 to drive linear stepping motor 40, stretches out, and start to enter sediment layer 2 with driving mechanical feeler lever 10 from the centre bore 21 of circular base plate 20; Now the position of mechanical feeler lever 10 may be defined as initial point.The deadweight of downhole sensor provides enough counter-forces, and linear stepping motor 40 provides enough power to make mechanical feeler lever 10 through sediment layer 2, arrives original soil 1 bearing stratum.Because the hardness of this layer is obviously higher, the counter-force that the deadweight of downhole sensor is provided, not enough so that mechanical feeler lever moves on; Therefore downhole sensor starts to tilt.For example, when mechanical feeler lever 10 stretches out (200mm) after a ultimate range, sediment 1 thickness testing process stops.In whole testing process, the distance that mechanical feeler lever 10 stretches out will be recorded in ground detecting instrument 00 with the change curve at the angle of slope of corresponding downhole sensor.Be different from the represented situation of Fig. 3, when the angle of slope here starts sharply to change, corresponding position is former soil layer 1 surface, can determine thus foot of hole sediment thickness.
Claims (6)
1. the foot of hole sediment thickness checkout gear based on nonhomogeneous hardness sensing, comprises ground detecting instrument (00) and winch (100); It is characterized in that:
Be provided with downhole sensor; Downhole sensor is made up of mechanical feeler lever (10), circular base plate (20), microscler cylinder (30), linear stepping motor (40), connection wire (50), circuit board (60), cable socket (70), multicore cable (80) and sealing ring (90);
Its position and annexation are:
Be provided with sealing ring (90) and cable socket (70) on the top of microscler cylinder (30);
Be provided with mechanical feeler lever (10), linear stepping motor (40) in the inside of microscler cylinder (30), connect wire (50) and circuit board (60);
Be provided with sealing ring (90) and circular base plate (20) in the bottom of microscler cylinder (30);
The upper end of machinery feeler lever (10) is connected with linear stepping motor (40), the lower end of machinery feeler lever (10) passes sealing ring (90), and can stretch out from the centre bore of circular base plate (20) (21);
In microscler cylinder (30) inside, by connecting wire (50), cable socket (70), circuit board (60) and linear stepping motor (40) are connected successively;
One end stube cable socket (70) of multicore cable (80), the other end of multicore cable connects ground detecting instrument (00) by winch (100).
2. by a kind of foot of hole sediment thickness checkout gear based on nonhomogeneous hardness sensing claimed in claim 1, it is characterized in that:
Described mechanical feeler lever (10) is made up of cylindrical stock (11) and conical termination (12).
3. by a kind of foot of hole sediment thickness checkout gear based on nonhomogeneous hardness sensing claimed in claim 1, it is characterized in that:
Described circular base plate (20) is provided with centre bore (21), entity area (22) and empty body region (23).
4. by a kind of foot of hole sediment thickness checkout gear based on nonhomogeneous hardness sensing claimed in claim 1, it is characterized in that:
Described circuit board (60) is made up of accelerometer (62), serial converter (63) and the DC stepper motor driver (64) at ARM single-chip microcomputer (61), measurement angle of slope;
Accelerometer (62), serial converter (63) and the DC stepper motor driver (64) of measuring angle of slope are connected with ARM single-chip microcomputer (61) respectively;
By serial converter (63), ARM single-chip microcomputer (61) is accepted to send testing result from the operational order of detecting instrument on ground (00) or to detecting instrument (00);
By measuring the accelerometer (62) at angle of slope, angle of slope result is admitted in ARM single-chip microcomputer (61);
ARM single-chip microcomputer (61) drives linear stepping motor (40) by DC stepper motor driver (64), to control stretching out or contracting and move back of mechanical feeler lever (10).
5. by a kind of foot of hole sediment thickness checkout gear based on nonhomogeneous hardness sensing claimed in claim 1, it is characterized in that:
The workflow of the application software of described detecting instrument (00) comprises the following steps:
A, work start;
B, initiation parameter: the step pitch a that mechanical feeler lever stretches out forward at every turn, and mechanical feeler lever adds up the range b stretching out;
C, by the multicore cable of connecting downhole sensor, transfer downhole sensor;
D, according to multicore cable pine or tightly judge whether downhole sensor arrives sediment layer surface; If stube cable fluffs, represent "Yes", forward next step to; Otherwise forward previous step to, continue to transfer downhole sensor;
E, stop transferring downhole sensor;
Do you F, judge that whether mechanical feeler lever is at initial position, in circular base plate centre bore? "No" if, forwards next step to; "Yes" if, forwards step H to;
G, mechanical feeler lever are got back to initial position;
H, the counter O reset of mechanical feeler lever accumulative total outreach, x=0;
I, mechanical feeler lever outreach a forward, and count mechanical feeler lever accumulative total outreach counter x, that is: x=x+a;
J, record corresponding downhole sensor angle of slope;
Do you K, judge whether the accumulative total outreach of mechanical feeler lever reaches range b, i.e. x >=b? "Yes" if, forwards next step to; "No" if, forwards step I to;
L, mechanical feeler lever stop motion;
M, mechanical feeler lever are got back to initial position;
Change curve between N, mechanical graphics feeler lever outreach and corresponding downhole sensor angle of slope; On this curve, when downhole sensor angle of slope sharply changes, corresponding mechanical feeler lever outreach, is sediment layer thickness;
O, winding shaft lower sensor are to ground;
P, end-of-job.
6. by the detection method of a kind of foot of hole sediment thickness checkout gear based on nonhomogeneous hardness sensing claimed in claim 1, it is characterized in that comprising the following steps:
1. operation detection instrument, confirms that mechanical feeler lever gets back to home position, i.e. the lower end of mechanical feeler lever contracting retreats in the centre bore of circular base plate;
2. downhole sensor is placed in boring, and relies on circular base plate to stand on foot of hole sediment surface;
3. read depth value now by detecting instrument, be the depth location h on foot of hole sediment surface;
4. operation detection instrument makes mechanical feeler lever extend out to a ultimate range; Stretch out in process at mechanical feeler lever, recorded the angle of slope of the corresponding downhole sensor of each outreach by detecting instrument, the axis direction of microscler cylinder is with respect to the angle of gravity direction;
5. on the curve changing with mechanical feeler lever outreach at the angle of slope of downhole sensor, determine corresponding distance value when angle of slope starts sharply to change, be the depth location H of the bottom surface of foot of hole sediment;
6. calculating foot of hole sediment thickness is H-h.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210158246.2A CN102661143B (en) | 2012-05-21 | 2012-05-21 | Device and method for detecting thickness of sediments at bottom of drilling hole based on hardness difference sensing |
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| CN201210158246.2A CN102661143B (en) | 2012-05-21 | 2012-05-21 | Device and method for detecting thickness of sediments at bottom of drilling hole based on hardness difference sensing |
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| CN104131584B (en) * | 2014-06-04 | 2016-03-16 | 杨燕军 | With continuous wall trench underground quality detection device and the method thereof of electronic compass |
| CN106545329B (en) * | 2016-11-09 | 2019-04-23 | 武汉长盛工程检测技术开发有限公司 | Drilled pile hole quality detection device and method |
| CN107130645B (en) * | 2017-06-06 | 2022-09-02 | 长江三峡勘测研究院有限公司（武汉） | Multifunctional vibrating type pile well sediment detector |
| CN107504936A (en) * | 2017-09-25 | 2017-12-22 | 江苏省水利科学研究院 | Mud detecting system and mud detection method |
| CN111042225B (en) * | 2019-12-25 | 2021-09-21 | 武汉中岩科技股份有限公司 | Device and method for accurately measuring thickness of sediment of cast-in-situ bored pile |
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| CN102661143A (en) | 2012-09-12 |
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