CN101074872A - Method and apparatus for determining pile length by reflective wave method - Google Patents
Method and apparatus for determining pile length by reflective wave method Download PDFInfo
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- CN101074872A CN101074872A CN 200710023286 CN200710023286A CN101074872A CN 101074872 A CN101074872 A CN 101074872A CN 200710023286 CN200710023286 CN 200710023286 CN 200710023286 A CN200710023286 A CN 200710023286A CN 101074872 A CN101074872 A CN 101074872A
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Abstract
A device using reflection wave to measure length of pile is prepared as setting primary reflection wave receiving transducer connected with wire of reflection-wave signal processor on pole body, setting secondary reflection wave receiving transducer connected with wire of reflection-wave signal processor also on pile body and making gap length between primary reflection wave receiving transducer and secondary reflection wave receiving transducer be 0.5-4 times of pile diameter. Its measuring method is also disclosed.
Description
Technical field
The present invention relates to an a kind of long equipment of a long equipment of stake and the long method of mensuration stake, the especially stake of reflective wave method mensuration and the long method of mensuration stake measured.
Background technology
The long principle of the definite stake of reflective wave method utilizes stress wave to propagate a needed back and forth time T exactly in pile body at present, then in conjunction with stress wave velocity of wave c, it is long to draw stake: L=C*T/2 (" pile quality detection technique ", work such as Chen Fan, China Construction Industry Press published in 2003) can find out that from formula velocity of wave is the influence factor of a key, it will directly influence long accurately the determining of stake.And at present in engineering practice, the way that simple intensity according to pile concrete probably estimates the stress wave velocity of wave is inaccurate, because velocity of wave is also relevant with factors such as concrete aggregate kind, size grading, density, water cement ratio except that outside the Pass having with concrete strength of pile.In addition, imbed bored concrete pile pile body concrete strength and ground cast preparation in the soil concrete sample intensity, all can have certain difference with the intensity of designing requirement.These reasons make all that stake is long many uncertainties.What is more important under the long uncertain situation of construction stake, is simply determined concrete strength or velocity of wave by above-mentioned formula inverse, can cause engineering quality supervision managerial out of control.
Summary of the invention
The object of the present invention is to provide an a kind of long equipment of a long equipment of stake and the long method of mensuration stake, the especially stake of reflective wave method mensuration and the long method of mensuration stake measured.
And equipment of the present invention and to measure the long method of stake be exactly at the situation of the prior art angle from experimental technique is under the long uncertain situation of stake, long thereby the value of wave speed that can make stress wave comparatively accurately can be determined stake.
Technical scheme of the present invention is:
Reflective wave method is measured the long equipment of stake, comprise that the first order reflection ripple accepts sensor, the reflection wave signal processor is formed, the first order reflection ripple is accepted sensor and is installed on the pile body, the first order reflection ripple is accepted sensor and is connected with reflection wave signal processor lead, wherein: also set up the secondary reflex ripple that is connected with reflection wave signal processor lead and accept sensor, the secondary reflex ripple is accepted sensor and also is installed on the pile body, the secondary reflex ripple accept sensor and first order reflection ripple accept between the sensor gap length for stake diameter 0.5-4 doubly.
Reflective wave method is measured the long equipment of stake, and wherein: the secondary reflex ripple is accepted the gap length that sensor and first order reflection ripple accept between the sensor and is 1-2 times of stake diameter.
The frequency of operation of reflection wave signal processor is 600HZ-1600HZ.
The frequency of operation of reflection wave signal processor is 800HZ-1200HZ.
Use reflective wave method and measure the long long method of measuring apparatus stake of stake, wherein follow these steps to carry out: make earlier preparation that the first order reflection ripple is installed and accept sensor, secondary reflex ripple to accept the pile body place of sensor exposed, with glue the first order reflection ripple is accepted on the stake top that sensor is bonded in pile body again, with glue the secondary reflex ripple is accepted sensor then and is bonded on the pile body, wherein the secondary reflex ripple accept sensor and first order reflection ripple accept between the sensor gap length for the 0.5-4 of stake diameter doubly; Adopt exciting hammer laser printer pile body from the stake top, the first order reflection ripple is accepted sensor and secondary reflex ripple and is accepted sensor and accept vibration signal respectively and signal is passed to the reflection wave signal processor by lead, and reflection wave signal processor for recording first order reflection ripple is accepted sensor and secondary reflex ripple and accepted mistiming between the sensor vibration signal; The reflection wave signal processor is accepted the distance that sensor and secondary reflex ripple accept between the sensor by computing time difference and first order reflection ripple and is obtained a long length.
Principle of work is as follows:
Measure the long computing formula of stake:
L1＝C*T1/2；L2＝C*T2/2；L1-L2＝L。
Because accepting gap length L, reflection interval T1, the reflection interval T2 that sensor 4 and first order reflection ripple accept between the sensor 3, the secondary reflex ripple can pass through device measuring, although velocity of propagation has certain interference to have a spot of error, but suppose identical with the reflection wave speed of measuring for the second time for the first time, so just can calculate L1 and L2, it is long that wherein L1 is exactly stake.
The invention has the advantages that: although velocity of wave is also relevant with factors such as concrete aggregate kind, size grading, density, water cement ratio except that outside the Pass having with concrete strength of pile.These reasons make all that stake is long many probabilistic positions.But owing to be to measure reflection wave at twice, twice reflection wave all is to conduct by same stake, different the is exactly secondary reflex ripple accepts sensor is accepted the reflection wave that sensor accepts than the first order reflection ripple and is lacked to walk diameter 0.5-4 distance doubly, though a lot of uncertain factors are so arranged, measure reflection wave at twice and systematic error can be reduced significantly.
Description of drawings
Fig. 1 is the structural representation of present device.
Reference numeral: exciting hammer 1, pile body 2, first order reflection ripple are accepted sensor 3, the secondary reflex ripple is accepted sensor 4, reflection wave signal processor 5.
Embodiment
The reflective wave method of embodiment 3, Application Example 1 is measured the long long method of measuring apparatus stake of stake, wherein follow these steps to carry out: make earlier preparation that the first order reflection ripple is installed and accept sensor 3, secondary reflex ripple to accept the pile body place of sensor 4 exposed, with glue the first order reflection ripple is accepted on the stake top that sensor 3 is bonded in pile body 2 again, with glue the secondary reflex ripple is accepted sensor 4 then and is bonded on the pile body 2, wherein the secondary reflex ripple accept sensor 4 and first order reflection ripple accept between the sensor 3 gap length for the 0.5-4 of stake diameter doubly; Adopt exciting to hammer 1 laser printer pile body 2 into shape from the stake top, the first order reflection ripple is accepted sensor 3 and is accepted sensor 4 with the secondary reflex ripple and accept vibration signal respectively and signal is passed to reflection wave signal processor 5 by lead, and reflection wave signal processor 5 record first order reflection ripples are accepted sensor 3 and secondary reflex ripple and accepted mistiming between sensor 4 vibration signals; Reflection wave signal processor 5 is accepted the distance that sensor 3 and secondary reflex ripple accept between the sensor 4 by computing time difference and first order reflection ripple and is obtained a long length.
The long method of mensuration stake of Application Example 4 is measured one 13.0 meters stake.D is the stake diameter in the measuring condition, and 400-1800HZ is the scope of reflection wave signal processor 5 frequency of operation.
Change distance and frequency successively, obtain following result:
| ?0.3d | 0.5d | 1d | 2d | 3d | 4d | 6d | |
| 1800HZ | 16.2 rice | 13.8 rice | 15.0 rice | 14.8 rice | 13.7 rice | 12.0 rice | 10.1 rice |
| 1600HZ | 16.3 rice | 13.6 rice | 13.5 rice | 13.4 rice | 13.4 rice | 12.6 rice | 12.5 rice |
| 1200HZ | 14.7 rice | 13.8 rice | 13.2 rice | 13.1 rice | 13.0 rice | 12.7 rice | 12.5 rice |
| 800HZ | 14.5 rice | 13.5 rice | 13.1 rice | 12.9 rice | 12.9 rice | 12.6 rice | 12.3 rice |
| 600HZ | 13.8 rice | 13.3 rice | 12.7 rice | 12.5 rice | 12.8 rice | 12.5 rice | 12.1 rice |
| 400HZ | 13.9 rice | 13.8 rice | 12.0 rice | 11.3 rice | 10.6 rice | 10.5 rice | 10.1 rice |
Accept sensor (4) and first order reflection ripple when the secondary reflex ripple and accept gap length between the sensor (3) for stake diameter 0.5-4 doubly the time.Measured deviation is little.
When the frequency of operation of reflection wave signal processor (5) is 600HZ-1600HZ.When better frequency of operation was 800HZ-1200HZ, measured deviation was little.
From data, can find, gap length to the influence of measuring accuracy greater than frequency of operation.
Although frequency of operation has certain influence to measured deviation, we think the mode deal with data of changing other can obtain similar measurement result equally.So frequency of operation is not the topmost technical characterictic of invention.
Claims (6)
1, reflective wave method is measured the long equipment of stake, comprise that the first order reflection ripple accepts sensor (3), reflection wave signal processor (5) is formed, the first order reflection ripple is accepted sensor (3) and is installed on the pile body (2), the first order reflection ripple is accepted sensor (3) and is connected with reflection wave signal processor (5) lead, it is characterized in that: also set up the secondary reflex ripple that is connected with reflection wave signal processor (5) lead and accept sensor (4), the secondary reflex ripple is accepted sensor (4) and also is installed on the pile body (2), the secondary reflex ripple accept sensor (4) and first order reflection ripple accept between the sensor (3) gap length for stake diameter 0.5-4 doubly.
2, reflective wave method as claimed in claim 1 is measured the long equipment of stake, it is characterized in that: the secondary reflex ripple is accepted the gap length that sensor (4) and first order reflection ripple accept between the sensor (3) and is 1-2 times of stake diameter.
3, reflective wave method as claimed in claim 1 is measured the long equipment of stake, and it is characterized in that: the frequency of operation of reflection wave signal processor (5) is 600HZ-1600HZ.
4, reflective wave method as claimed in claim 3 is measured the long equipment of stake, and it is characterized in that: the frequency of operation of reflection wave signal processor (5) is 800HZ-1200HZ.
5, the reflective wave method of application rights requirement 1 or claim 3 is measured the long long method of measuring apparatus stake of stake, it is characterized in that following these steps to carrying out: make preparation that the first order reflection ripple is installed earlier and accept sensor (3), the pile body place that the secondary reflex ripple is accepted sensor (4) exposes, with glue the first order reflection ripple is accepted on the stake top that sensor (3) is bonded in pile body (2) again, with glue the secondary reflex ripple is accepted sensor (4) then and is bonded on the pile body (2), wherein the secondary reflex ripple accept sensor (4) and first order reflection ripple accept between the sensor (3) gap length for the 0.5-4 of stake diameter doubly; Adopt exciting hammer (1) laser printer pile body (2) from the stake top, the first order reflection ripple is accepted sensor (3) and secondary reflex ripple and is accepted sensor (4) and accept vibration signal respectively and signal is passed to reflection wave signal processor (5) by lead, and reflection wave signal processor (5) record first order reflection ripple is accepted sensor (3) and secondary reflex ripple and accepted mistiming between sensor (4) vibration signal; Reflection wave signal processor (5) is accepted the distance that sensor (3) and secondary reflex ripple accept between the sensor (4) by computing time difference and first order reflection ripple and is obtained a long length.
6, the reflective wave method of application rights requirement 1 or claim 3 is measured the long long method of measuring apparatus stake of stake, it is characterized in that following these steps to carrying out: make preparation that the first order reflection ripple is installed earlier and accept sensor (3), the pile body place that the secondary reflex ripple is accepted sensor (4) exposes, with glue the first order reflection ripple is accepted on the stake top that sensor (3) is bonded in pile body (2) again, adopt exciting hammer (1) laser printer pile body (2) from the stake top, the first order reflection ripple is accepted sensor (3) and is accepted vibration signal and signal is passed to reflection wave signal processor (5) by lead, and reflection wave signal processor (5) record first order reflection ripple is accepted sensor (3) vibration signal; With glue the secondary reflex ripple is accepted sensor (4) again and is bonded on the pile body (2), wherein the secondary reflex ripple accept sensor (4) and first order reflection ripple accept between the sensor (3) gap length for the 0.5-4 of stake diameter doubly; Adopt exciting hammer (1) laser printer pile body (2) from the stake top, the secondary reflex ripple is accepted sensor (4) and is accepted vibration signal and signal is passed to reflection wave signal processor (5) by lead, and reflection wave signal processor (5) record secondary reflex ripple is accepted sensor (4) vibration signal; Reflection wave signal processor (5) is accepted the distance that sensor (3) and secondary reflex ripple accept between the sensor (4) by computing time difference and first order reflection ripple and is obtained a long length.
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| CN 200710023286 CN101074872A (en) | 2007-06-13 | 2007-06-13 | Method and apparatus for determining pile length by reflective wave method |
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| CN 200710023286 CN101074872A (en) | 2007-06-13 | 2007-06-13 | Method and apparatus for determining pile length by reflective wave method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105200982A (en) * | 2015-09-25 | 2015-12-30 | 中国二十冶集团有限公司 | Cast-in-place pile concrete interface recognition and super-cast loosening device and use method thereof |
| CN105423967A (en) * | 2016-01-25 | 2016-03-23 | 国网浙江慈溪市供电公司 | Handheld type measuring instrument for measuring buried depth of telegraph pole and controller of handheld type measuring instrument |
| CN106049567A (en) * | 2016-08-09 | 2016-10-26 | 浙江省建设工程质量检验站有限公司 | Detecting device for determining length of foundation pile by parallel earthquake method and detecting method thereof |
| CN106049566A (en) * | 2016-08-09 | 2016-10-26 | 浙江省建设工程质量检验站有限公司 | Detection device and method for determining length of foundation pile through bypass port transmission wave method |
| CN106088170A (en) * | 2016-08-09 | 2016-11-09 | 浙江省建设工程质量检验站有限公司 | Detection device and the detection method thereof of foundation pile length is determined based on parallel seismic wave method |
-
2007
- 2007-06-13 CN CN 200710023286 patent/CN101074872A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105200982A (en) * | 2015-09-25 | 2015-12-30 | 中国二十冶集团有限公司 | Cast-in-place pile concrete interface recognition and super-cast loosening device and use method thereof |
| CN105423967A (en) * | 2016-01-25 | 2016-03-23 | 国网浙江慈溪市供电公司 | Handheld type measuring instrument for measuring buried depth of telegraph pole and controller of handheld type measuring instrument |
| CN106049567A (en) * | 2016-08-09 | 2016-10-26 | 浙江省建设工程质量检验站有限公司 | Detecting device for determining length of foundation pile by parallel earthquake method and detecting method thereof |
| CN106049566A (en) * | 2016-08-09 | 2016-10-26 | 浙江省建设工程质量检验站有限公司 | Detection device and method for determining length of foundation pile through bypass port transmission wave method |
| CN106088170A (en) * | 2016-08-09 | 2016-11-09 | 浙江省建设工程质量检验站有限公司 | Detection device and the detection method thereof of foundation pile length is determined based on parallel seismic wave method |
| CN106049567B (en) * | 2016-08-09 | 2018-01-05 | 浙江省建设工程质量检验站有限公司 | Parallel seismic wave method determines the detection means and its detection method of foundation pile length |
| CN106088170B (en) * | 2016-08-09 | 2018-01-23 | 浙江省建设工程质量检验站有限公司 | The detection means and its detection method of foundation pile length are determined based on parallel seismic wave method |
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