CN100480669C - Basic structure dynamic measuring instrument capable of asynchronous collecting signal and synchronous correcting - Google Patents
Basic structure dynamic measuring instrument capable of asynchronous collecting signal and synchronous correcting Download PDFInfo
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- CN100480669C CN100480669C CNB2006100497823A CN200610049782A CN100480669C CN 100480669 C CN100480669 C CN 100480669C CN B2006100497823 A CNB2006100497823 A CN B2006100497823A CN 200610049782 A CN200610049782 A CN 200610049782A CN 100480669 C CN100480669 C CN 100480669C
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Abstract
A dynamic admeasuring apparatus with basic structure which can collect signals asynchronously and correct synchronously contains two power sensors and two acceleration sensors. The sensors are equipped on both sides of pile body below the tested pile block symmetrically. Each sensor joints to AD amplifier via amplification circuit and the output of the amplifier connects and communicates with microprocessor by A/D transducer. Set pile foundation testing module which can analyze its quality based on signals from different sensors in the microprocessor. The admeasuring apparatus also contains a selection control circuit being used to establish four selection channels for sensors. The output of the selection control circuit connects with the parallel interface of the computer through an A/D transducer. With the controlling of microprocessor, line controller collects signals from four channels alternatively and asynchronously. The signals are fitted for reducing and synchronizing to get integrated signal waveforms. The invention provides a dynamic admeasuring apparatus with basic structure having simple circuit structure and low cost.
Description
(1) technical field
The present invention relates to a kind of measuring technology of pile foundation quality, especially a kind of basic structure dynamic measuring instrument of asynchronous collecting signal synchronous correction.
(2) background technology
Along with increasing of skyscraper, bridge and large-scale civil engineering, pile foundation is widely used.Owing to be subjected to the influence of geologic condition and construction technology, fracture or defective such as inhomogeneous sometimes can take place in pile foundation, thereby reduce the load force of stake.Therefore, these can not bear the big load from skyscraper and bridge, so that some accidents take place, as the inclination of building or bridge with collapse.In order to guarantee construction quality, must detect pile foundation.
Traditional pile foundation quality detection method mainly contains gets core method, supercritical ultrasonics technology and rays method etc., along with improving constantly of wave theory, vibration engineering, signal analysis technology, electronic technology and microprocessor technology, vibratory drilling method and fluctuation method dynamic detection technology have been obtained development rapidly and have been used widely, wherein are divided into high strain detecting method and low strain detecting method again.In pilework quality testing now, no matter be high strain detecting method or low strain detecting method, all be by the hammering pile foundation, the axial strain in the representational pile body of annex cross section, collecting pile top and the time-history curves of pile body acceleration of motion, by sensor movement velocity and the ess-strain seizure that stress wave produces is converted into electric signal in communication process, and electric signal is converted into digital signal by treatment circuit submits to special-purpose detecting instrument, process the signal into F-v figure, by the analysis of curve waveform among the figure being judged the quality of pile foundation.
In order to reduce the influence of the eccentric hammering that may occur, each two of strain transducer and acceleration transducers must be installed during test, should this must be simultaneously carry out the A/D conversion to four tunnel electric signal.So just need four A/D converters to work simultaneously, need special-purpose testing tool four way word signals to be handled drawing simultaneously, this method costliness and circuit complexity simultaneously.
(3) summary of the invention
In order to overcome existing basic structure dynamic measuring instrument complex structure, deficiency that cost is high, the invention provides the basic structure dynamic measuring instrument of the asynchronous collecting signal synchronous correction that a kind of circuit structure is simple, cost is low.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of basic structure dynamic measuring instrument of asynchronous collecting signal synchronous correction, comprise two force transducers and two acceleration transducers, two force transducers, two acceleration transducer symmetries are installed in the following pile body both sides, stake top of pile foundation to be measured, each sensor is connected to the AD amplifier through amplifying circuit, the output of amplifier is connected with microprocessor communication by A/D converter, the signal that is provided with in the described microprocessor according to each sensor carries out the pile test module that pile foundation quality is analyzed, the basic structure dynamic measuring instrument of described asynchronous collecting signal also comprises the selection control circuit in order to the selector channel of setting up No. four sensors, the input end of described selection control circuit connects the output of four road AD amplifiers respectively, the output of described selection control circuit is connected with the parallel interface of microprocessor by an A/D converter, described microprocessor also comprises the asynchronous-sampling control module that is used to control four tunnel signal asynchronous samplings, the asynchronous pseudo compound module that four groups of sensor signals that are used for gathering carry out curve fitting, described asynchronous-sampling control module connects the line switching of described selection control circuit, the input end of described asynchronous pseudo compound module connects the parallel interface of microprocessor, and the output terminal of described asynchronous pseudo compound module connects described pile test module.
Further, described asynchronous-sampling control module is t in order to set the sampling width
o, the cycle is 4t
o, 0-t
oConstantly first via signal is measured t
o-2t
oConstantly the second road signal is measured 2t
o-3t
oConstantly the Third Road signal is measured 3t
o-4t
oConstantly the four road signal is measured.
Further again, described asynchronous pseudo compound module is used for four road signals of asynchronous collecting are carried out match respectively, adopts the parabolic method of 3 definition, and the 3 any continuous points in the number of the winning the confidence sequence simulate one section parabolic curve section.
Principle of work of the present invention is: asynchronous collecting data sync alignment technique, only utilize an A/D converter to carry out the A/D conversion, utilize the parallel interface of PC to carry out data acquisition simultaneously, utilize microprocessor that four circuit-switched data are reduced, convenient and swift while cost is lower.
Beneficial effect of the present invention mainly shows: 1, simple in structure; 2, cost is low; 3, convenient to use.
(4) description of drawings
Fig. 1 is the structural drawing of measurement of pile foundation instrument.
Fig. 2 is the synoptic diagram of signal asynchronous collection.
Fig. 3 is the curve fitting synoptic diagram.
(5) embodiment
Below in conjunction with accompanying drawing the present invention is further described.
With reference to Fig. 1, Fig. 2, Fig. 3, a kind of basic structure dynamic measuring instrument of asynchronous collecting signal synchronous correction, comprise two force transducers 1 and two acceleration transducers 2, two force transducers 1, two acceleration transducer 2 symmetries are installed in the following pile body both sides, stake top of pile foundation to be measured, each sensor is connected to AD amplifier 4 through amplifying circuit 3, the output of amplifier 4 communicates to connect by A/D converter 6 and microprocessor 7, the signal that is provided with in the described microprocessor 7 according to each sensor carries out the pile test module 8 that pile foundation quality is analyzed, the basic structure dynamic measuring instrument of described asynchronous collecting signal also comprises the selection control circuit 5 in order to the selector channel of setting up No. four sensors, the input end of described selection control circuit 5 connects the output of four road AD amplifiers 4 respectively, the output of described selection control circuit 5 is connected with the parallel interface 9 of microprocessor by an A/D converter 6, described microprocessor 7 also comprises the asynchronous-sampling control module 10 that is used to control four tunnel signal asynchronous samplings, the asynchronous pseudo compound module 11 that four groups of sensor signals that are used for gathering carry out curve fitting, described asynchronous-sampling control module 11 connects the line switching of described selection control circuit 5, the input end of described asynchronous pseudo compound module 11 connects the parallel interface 9 of microprocessor, and the output terminal of described asynchronous pseudo compound module 11 connects described pile test module 8.
Described asynchronous-sampling control module 11 is t in order to set the sampling width
o, the cycle is 4t
o, 0-t
oConstantly first via signal is measured t
o-2t
oConstantly the second road signal is measured 2t
o-3t
oConstantly the Third Road signal is measured 3t
o-4t
oConstantly the four road signal is measured.
The course of work of present embodiment is: a force transducer and an acceleration transducer are installed by following pile body one side central authorities on the stake top of pile foundation to be measured, and at a same force transducer and the acceleration transducer installed of the one side of symmetry, the position keeps symmetry simultaneously.Each sensor is connected to the AD amplifier by amplifying circuit, and unification is connected to a selection control then, and the signal after selecting through selection control is sent to A/D converter and carries out mould/number conversion, and last digital signal is sent to the microprocessor parallel interface.By the microprocessor parallel interface selection control and A/D converter are controlled simultaneously.
This technology is by applying impact with hammer in stake, to produce elastic wave and impedance, the stress wave signal that receives on the pile foundations by near two force transducers that are installed in the pile foundation top produces charge signal, the acceleration signal that while two acceleration transducers receive on the pile foundation produces the two-way charge signal equally, and every road signal is transformed into voltage signal output by amplifying circuit with charge signal.Voltage signal carries out the signal amplification by the AD amplifier then, and the signal after the amplification is transported to selection control.Microprocessor comes channel selecting that four road signals are sampled by the control selection control, is not that four road signals are gathered simultaneously here, but four road signals is carried out acquisition order successively by a time interval.Signal after the sampling of Be Controlled selector switch is sent to A/D converter and carries out mould/number conversion, change eight digital signal into, be sent to the parallel interface of microprocessor at last, because the support of parallel bidirectional interface is once read eight bit data, so microprocessor can come the data of parallel interface are collected signal data by programming.
Of the present invention focusing on carried out asynchronous-sampling by the control selector switch to four road signals, promptly every road signal periodically measured, and be t as the sampling width
o, the cycle is 4t
o, be exactly 0-t
oConstantly first via signal is measured t
o-2t
oConstantly the second road signal is measured 2t
o-3t
oConstantly the Third Road signal is measured 3t
o-4t
oConstantly the four road signal is measured, again first via signal is measured then, so repeatedly.
Present embodiment adopts A/D converter ADS7809, and its sample frequency is 100K, and therefore each sampling time interval is 10 μ s, because four road signals take same bandwidth, is 40 μ s to one tunnel signals sampling time interval therefore, and the sampling figure as shown in Figure 2.After digital signal is imported into microprocessor, microprocessor divides into groups to digital signal successively, signal is divided into four groups, the digital signal of Cai Jiing is included into four groups in proper order successively, as shown in Figure 2,1. all signals will reassemble into the sequence of set of number signal, and 2. all signals also will reassemble into the sequence of set of number signal, and 4. 3. signal so handled too with signal.What obtain at last is four tunnel signals sampling sequences.
By parabolic method four groups of signals are carried out curve fitting at last among the present invention.Here use the parabolic method of 3 definition that signal is carried out match and reduction: 3 any continuous P in the number of the winning the confidence sample sequence
0, P
1, P
2, can simulate one section parabolic curve section, express formula with parameter vector here, promptly
P(t)＝A
0+A
1t+A
2t
2 (0≤t≤1) (1)
This curve is with A by a series of
0Be starting point, at A
1Get t on the direction, at A
2Get t on the direction
2The curve that draws is so should be para-curve.This para-curve satisfies:
(1) during t=0, para-curve passes through P
0Point and and P
0P
1Line is tangent.
(2) during t=1, para-curve passes through P
2Point and and P
1P
2Line is tangent.
Therefore para-curve can be by P
0P
1 P
23 defined parameter expressions show.
To the t differential in the formula (1) can get P ' (t)=A
1+ 2*A
2* t, so
P(0)＝A
0＝P
0 (2)
P(1)＝A
0+A
1+A
2＝P
2 (3)
P’(0)＝A
1＝K(P
1-P
0) (4)
P’(1)＝A
1+2*A
2＝L(P
2-P
1) (5)
Wherein K, L are constant.Can put in order out thus
2(P
2-P
0)＝K(P
1-P
0)+L(P
2-P
1)
Because (P
2-P
1) and (P
1-P
0) linear independence, so K=L=2.Therefore
As representing, promptly with the component form
Wherein,
A
1＝2(X
1-X
0)
A
2＝X
0-2X
1+X
2
B
1＝2(Y
1-Y
0)
B
2＝Y
0-2Y
1+Y
2
Thus, continuous 3 digital signal in the substitution burst just can obtain the digital signal value of any t time in this 3 time intervals, therefore can fit out this section parabolic curve section.So also need to connect into an arbitrary curve some segment of curve are smooth.Here need to obtain the common tangent of two segment of curve junctions, as ask the P among Fig. 3
1～P
5Curve, we get P earlier
2, P
3Mid point Q
1, then with P
1, P
2, Q
1Be three point ranges, calculate this section curve, and then get P
3, P
4Mid point Q
2, with Q
1, P
3, Q
2Be three point ranges, the calculated curve section can be obtained complete smooth signal curve with the burst of random length with this again.
Can realize above computation process by the microprocessor programming, get suitable time interval point, just can simulate smooth signal curve.Simultaneously because sampling is asynchronous carrying out, differ t successively respectively as the initial sampled point of four groups of signals
0, can make four groups of signals together with 4t
0Be initial sampled point, thereby can obtain the synchronizing signal curve of four groups of signals.Thus, can on microprocessor, restore four bars curves, be respectively two stress curves, accelerating curve, detect for pile foundation quality and use by above process.
Claims (3)
1, a kind of basic structure dynamic measuring instrument of asynchronous collecting signal synchronous correction, comprise two force transducers and two acceleration transducers, a force transducer and an acceleration transducer are installed in pile body one side, another force transducer and an acceleration transducer symmetry are installed in the pile body opposite side, each sensor is connected to the AD amplifier through amplifying circuit, the output of amplifier is connected with microprocessor communication by A/D converter, the signal that is provided with in the described microprocessor according to each sensor carries out the pile test module that pile foundation quality is analyzed, it is characterized in that: the basic structure dynamic measuring instrument of described asynchronous collecting signal also comprises the selection control circuit in order to the selector channel of setting up No. four sensors, the input end of described selection control circuit connects the output of four road AD amplifiers respectively, the output of described selection control circuit is connected with the parallel interface of microprocessor by an A/D converter, described microprocessor also comprises the asynchronous-sampling control module that is used to control four tunnel signal asynchronous samplings, the asynchronous pseudo compound module that four groups of sensor signals that are used for gathering carry out curve fitting, described asynchronous-sampling control module connects the line switching of described selection control circuit, the input end of described asynchronous pseudo compound module connects the parallel interface of microprocessor, and the output terminal of described asynchronous pseudo compound module connects described pile test module.
2, the basic structure dynamic measuring instrument of asynchronous collecting signal synchronous correction as claimed in claim 1 is characterized in that: described asynchronous-sampling control module is t in order to set the sampling width
o, the cycle is 4t
o, 0-t
oConstantly first via signal is measured t
o-2t
oConstantly the second road signal is measured 2t
o-3t
oConstantly the Third Road signal is measured 3t
o-4t
oConstantly the four road signal is measured.
3, the basic structure dynamic measuring instrument of asynchronous collecting signal synchronous correction as claimed in claim 1 or 2, it is characterized in that: described asynchronous pseudo compound module, be used for four road signals of asynchronous collecting are carried out match respectively, adopt the parabolic method of 3 definition, 3 any continuous points in the number of the winning the confidence sequence simulate one section parabolic curve section.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104196065A (en) * | 2014-09-27 | 2014-12-10 | 上海岩联工程技术有限公司 | Wireless intelligent high strain sensor and wireless intelligent high strain detection method |
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|---|---|---|---|---|
| CN102867122A (en) * | 2012-09-11 | 2013-01-09 | 中国航天科技集团公司第五研究院第五一三研究所 | Parabolic waveform fitting method of interference data |
| CN103077006B (en) * | 2012-12-27 | 2015-08-26 | 浙江工业大学 | A kind of Long routine executed in parallel method based on multithreading |
| CN103898928A (en) * | 2014-03-12 | 2014-07-02 | 广东省建筑科学研究院 | Improved high strain method |
| CN105544623A (en) * | 2016-01-29 | 2016-05-04 | 湖南省计量检测研究院 | Calibrating device and calibrating method applied to dynamic measuring instrument of foundation pile |
| CN106726031A (en) * | 2016-12-27 | 2017-05-31 | 北京石油化工学院 | A kind of measurement apparatus of prosthetic socket Evaluation of Comfort |
| CN107071595B (en) * | 2017-05-12 | 2019-06-25 | 武汉邮电科学研究院 | The Transmission system of asynchronous control signal |
| CN107331262A (en) * | 2017-08-21 | 2017-11-07 | 东华理工大学 | Foundation pile integrity analysis and teaching experiment bracket signal synchronous acquisition device |
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| US3960008A (en) * | 1974-12-12 | 1976-06-01 | Goble George G | Pile capacity testing means |
| US4359890A (en) * | 1979-07-09 | 1982-11-23 | Societe Anonyme France-Atlas | Apparatus for testing the load-bearing properties of a foundation |
| CN2078875U (en) * | 1990-07-31 | 1991-06-12 | 胡学宁 | Nondestructive detector of strength of sintered brick |
| CN2252334Y (en) * | 1996-01-16 | 1997-04-16 | 中国建筑材料科学研究院 | Cement mortar jolt ramming stand |
| CN2919233Y (en) * | 2006-03-10 | 2007-07-04 | 浙江工业大学 | Foundation structure dynamic measuring meter |
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2006
- 2006-03-10 CN CNB2006100497823A patent/CN100480669C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3960008A (en) * | 1974-12-12 | 1976-06-01 | Goble George G | Pile capacity testing means |
| US4359890A (en) * | 1979-07-09 | 1982-11-23 | Societe Anonyme France-Atlas | Apparatus for testing the load-bearing properties of a foundation |
| CN2078875U (en) * | 1990-07-31 | 1991-06-12 | 胡学宁 | Nondestructive detector of strength of sintered brick |
| CN2252334Y (en) * | 1996-01-16 | 1997-04-16 | 中国建筑材料科学研究院 | Cement mortar jolt ramming stand |
| CN2919233Y (en) * | 2006-03-10 | 2007-07-04 | 浙江工业大学 | Foundation structure dynamic measuring meter |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104196065A (en) * | 2014-09-27 | 2014-12-10 | 上海岩联工程技术有限公司 | Wireless intelligent high strain sensor and wireless intelligent high strain detection method |
| CN104196065B (en) * | 2014-09-27 | 2016-07-06 | 上海岩联工程技术有限公司 | A kind of intelligent wireless Large strain sensor and wireless high strain monitoring method |
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| CN101033616A (en) | 2007-09-12 |
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