CN108560617A - A kind of pile defect detection method - Google Patents
A kind of pile defect detection method Download PDFInfo
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- CN108560617A CN108560617A CN201810422410.3A CN201810422410A CN108560617A CN 108560617 A CN108560617 A CN 108560617A CN 201810422410 A CN201810422410 A CN 201810422410A CN 108560617 A CN108560617 A CN 108560617A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
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Abstract
A kind of pile defect detection method, exciting source is set in the soil around pile of pile foundation side, by the way that the stress wave signal in the sensor detection transmission of pile foundation top sidewall is arranged, according to the position of the Mintrop wave slope-inversion point in time depth oscillogram, the position of the pile defect in pile foundation quality and pile foundation is determined.Wherein, by by pile measurement to be detected to the Mintrop wave time compared with the Mintrop wave time of standard pile foundation, it is all the presence of pile defect so as to predefine pile foundation, when pile defect is not present in pile foundation, the position of pile defect is then no longer determined by the exciting source of different location, in the case of same detection result, detection time can be reduced, improves detection efficiency.
Description
Technical field
The present invention relates to pile foundation detection fields, more particularly, to a kind of pile defect detection method.
Background technology
Pile foundation has been widely applied as a kind of Deep Foundation Structure form in field of civil engineering.Pile foundation energy
It is enough that the dead weight of superstructure and the load born are transmitted in the steady soil contacted with pile foundation, therefore largely
Reduce basis sedimentation and building differential settlement.Pile foundation have high capacity, settling amount is small, shock resistance is strong
The advantages that, it is widely applied in the area of some complex geologic conditions, soft, the more earthquake of soil property, and obtained considerable effect.
Pile foundation can be divided into bored concrete pile and prefabricated pile by manufacture craft, the use of wherein bored concrete pile be it is relatively broad, such as：
The engineerings such as bridge, highway, railway, skyscraper.But pile foundation is in manufacturing process of constructing, because of construction technology, personnel's operation, outer
Easily there is broken pile, expansion neck, undergauge, isolation, folder mud, sediment, cavity etc. and lacks in the influence of the factors such as boundary's condition and quality of materials
Fall into, these defects are exactly the potential risk of building, greatly affected the quality of building, once fault location load not on
The quality of portion's structure, will result in building collapse, and loss is extremely serious.Therefore, pile measurement is just particularly important, only
It timely detects Defect Piles, takes effective control measure, could greatly improve structural quality.
Currently, there are many China's pile measurement methods, including bore extracting core process, sound wave transmission method, Large strain method and low
Strain Method etc..Reflective wave method wherein in low strain dynamic hair is since its basic principle is simple, quick nondestructive, data interpretation are intuitive, accurate
The higher main stream approach as detection of pier foundation quality of exactness.The basic principle of low strain reflected wave method detection：Apply wink in stake top
Sensor is sticked to stake top to receive pile body signal (such as acceleration signal, speed signal) by state exciting force.By the speed for analyzing stake
Response curve and vibratory response are spent to judge the defect of pile body.Swash however, conventional low strain reflected wave method is generated by stake top
It shakes, pile bottom reflection signal strength can be reduced when foundation pile draw ratio is excessive, in addition stake top structure can also generate accumulation signal dry
It disturbs.
In the prior art, Research Institute of Highway Ministry of Transport proposes in the patent of invention of CN201510072408.4
The reflection wave method device of exciting, is arranged exciting source, by setting in the soil around pile of pile foundation side in a kind of side inspecting hole
Set the stress wave signal in the sensor detection transmission of pile foundation top sidewall, according to when m- depth oscillogram in Mintrop wave slope
The position of inflection point determines the position of the pile defect in pile foundation.
By the method for CN201510072408.4 patents of invention, the problem that reflection wave signal can be avoided too weak, simultaneously
Do not limited by stake top structure, in construction pile foundation or in-service pile foundation can be detected.However, being deposited in engineering practice
In the pile foundation usually not more than 20% of pile defect, this method for be required for when every pile measurement by exciting source from swash
The nozzle of vibration wave pipe upper end presses certain spacing decentralization until the bottom of exciting wave duct from top to bottom, and detection process is complicated, spends
Time is more.
Invention content
Improvement of the present invention as CN201510072408.4 patents of invention proposes a kind of pile defect detection method, energy
Detection efficiency is improved, the cost time in detection process is reduced.
As one aspect of the present invention, a kind of pile defect detection method, a kind of pile defect detection method, packet are provided
Include following steps：（1）First exciting wave duct is set in the soil around pile of zero defect pile foundation, the side wall setting the in pile foundation top end part
One acceleration transducer；（2）The bottom that exciting source is placed into the first exciting wave duct carries out exciting, passes through the first acceleration sensing
Device detects the time Tf that stress wave Mintrop wave reaches the first acceleration transducer；（3）It is arranged second in the Zhou Tuzhong of pile foundation to be detected
The second acceleration transducer is arranged in exciting wave duct, the side wall in pile foundation top end part to be detected；（4）Exciting source is placed into second to swash
The bottom of vibration wave pipe carries out exciting, and detecting stress wave Mintrop wave by the second acceleration transducer reaches the second acceleration transducer
Time Ts；（5）Data analyzer judges that the pile foundation to be detected whether there is pile defect according to the difference of Tf and Ts, if there is
Pile defect enters step（6）；It is entered step if there is no pile defect（9）；（6）Exciting source is passed through into the second exciting wave duct
Nozzle press certain spacing from top to bottom and transfer, often transfer to position at one, exciting source starts exciting；（7）Exciting source is each
When exciting, the second acceleration transducer obtains stress wave signal；（8）Data analyzer receives second acceleration transducer
Detect signal, exciting source location information detection signal, m- depth oscillogram when making, according to when m- depth oscillogram in
The position of Mintrop wave slope-inversion point determines the position of pile defect；（9）Terminate the quality testing of the pile foundation to be detected.
Preferably, the pile foundation to be detected is identical as the specification of the zero defect pile foundation and depth.
Preferably, the step（3）In, horizontal distance and the step of the second exciting wave duct with pile foundation to be detected（1）
In the first exciting wave duct it is equal with the horizontal distance of zero defect pile foundation.
Preferably, the step（3）In, the height of the second acceleration transducer and the step（1）In the second acceleration
The height of sensor is equal.
Preferably, the step（5）In, if the absolute value of the difference of Tf and Ts is less than or equal to threshold value, judge that this is waited for
Detection of pier foundation whether there is pile defect；Otherwise, judge that pile defect is not present in the pile foundation to be detected.
As one aspect of the present invention, a kind of pile defect detection method is provided, is included the following steps：（1）Intact
It falls into the soil around pile of pile foundation and the first exciting wave duct is set, the first acceleration transducer is arranged in the side wall in pile foundation top end part；（2）It will
The bottom that exciting source is placed into the first exciting wave duct carries out exciting, and detecting stress wave Mintrop wave by the first acceleration transducer reaches
The time Tf of first acceleration transducer；（3）Second exciting wave duct is set in the Zhou Tuzhong of pile foundation to be detected, in pile foundation to be detected
The second acceleration transducer is arranged in the side wall of top end part；（4）The bottom that exciting source is placed into the second exciting wave duct carries out exciting,
The time Ts that stress wave Mintrop wave reaches the second acceleration transducer is detected by the second acceleration transducer；（5）According to Tf and Ts
Difference judge the pile foundation to be detected whether there is pile defect, entered step if there is pile defect（6）；If there is no
Pile defect enters step（11）；（6）Difference measurement column is set beside the exciting wave duct；（7）In the difference measurement column
Difference acceleration transducer is arranged in the side wall of top end part；（8）Exciting source is pressed from top to bottom by the nozzle of the second exciting wave duct
Certain spacing decentralization, often transfers to position at one, exciting source starts exciting；（9）When each exciting of exciting source, the second acceleration
Sensor and difference acceleration transducer obtain stress wave signal；（10）Data analyzer receives second acceleration sensing
Detection signal, the location information of exciting source and the detection signal of the differential sensor of device, determine in pile foundation to be detected
The position of pile defect；（11）Terminate the quality testing of the pile foundation to be detected.
Preferably, the pile foundation to be detected is identical as the specification of the zero defect pile foundation and depth.
Preferably, the step（3）In, horizontal distance and the step of the second exciting wave duct with pile foundation to be detected（1）
In the first exciting wave duct it is equal with the horizontal distance of zero defect pile foundation.
Preferably, the step（3）In, the height of the second acceleration transducer and the step（1）In the first acceleration
The height of sensor is equal.
Preferably, the step（5）In, if the absolute value of the difference of Tf and Ts is less than or equal to threshold value, judge that this is waited for
Detection of pier foundation whether there is pile defect；Otherwise, judge that pile defect is not present in the pile foundation to be detected.
Preferably, the step（6）In, the difference measurement column is at a distance from the second exciting wave duct and pile to be checked
Base is equal at a distance from the second exciting wave duct, the length also equal length with the pile foundation to be detected.
Preferably, the step（7）In, the level height of the difference acceleration transducer is passed with second acceleration
The level height of sensor is equal.
Preferably, the step（10）In, data analyzer is determined and is answered according to the detection signal of difference acceleration transducer
Reeb initially reaches the time t1 of difference acceleration transducer；By the detection time t2 of the second acceleration transducer received,
The time t1 that the stress wave initially reaches difference acceleration transducer is subtracted, Differential time t is obtained；Data analyzer is according to sharp
The detection signal amplitude of vibration source depth, Differential time t, and the detection time t2 brief acceleration sensors of corresponding Differential time t,
Differential time-depth oscillogram is generated, the position of Mintrop wave slope-inversion point is determined according to Differential time-depth oscillogram, then the head
The corresponding depth of wave slope-inversion point is the position where pile defect.
Description of the drawings
Fig. 1 is first embodiment of the invention pile defect detection method flow chart.
Fig. 2 is second embodiment of the invention pile defect detection method flow chart.
Specific implementation mode
In order to illustrate more clearly of technical scheme of the present invention, embodiment will be used simply to be situated between the present invention below
It continues, it should be apparent that, in being described below is only one embodiment of the present of invention, and those of ordinary skill in the art are come
It says, without having to pay creative labor, other technical solutions can also be obtained according to these embodiments, also belonged to
Disclosure of the invention range.
The pile defect detection method of first embodiment of the invention includes the following steps referring to Fig. 1：（1）In zero defect stake
First exciting wave duct is set in the soil around pile of base, and the first acceleration transducer is arranged in the side wall in pile foundation top end part；（2）By exciting
The bottom that source is placed into the first exciting wave duct carries out exciting, and detecting stress wave Mintrop wave by the first acceleration transducer reaches first
The time Tf of acceleration transducer；（3）Second exciting wave duct is set in the Zhou Tuzhong of pile foundation to be detected, on pile foundation top to be detected
The second acceleration transducer is arranged in the side wall in portion；（4）The bottom that exciting source is placed into the second exciting wave duct carries out exciting, passes through
Second acceleration transducer detects the time Ts that stress wave Mintrop wave reaches the second acceleration transducer；（5）Data analyzer according to
The difference of Tf and Ts judges that the pile foundation to be detected whether there is pile defect, is entered step if there is pile defect（6）；If
There is no pile defects to enter step（9）；（6）Exciting source is pressed by the nozzle of the second exciting wave duct from top to bottom it is certain between
Away from decentralization, position at one is often transferred to, exciting source starts exciting；（7）When each exciting of exciting source, the second acceleration transducer obtains
Take stress wave signal；（8）Data analyzer receives the location information of the detection signal of second acceleration transducer, exciting source
Detection signal, m- depth oscillogram when making, according to when m- depth oscillogram in Mintrop wave slope-inversion point position, determine stake
The position of body defect；（9）Terminate the quality testing of the pile foundation to be detected.
Specifically, step（1）In, the first exciting wave duct is set at 1 ~ 2m of horizontal distance of zero defect pile foundation.First swashs
Vibration wave pipe is arranged in parallel with zero defect pile foundation, pvc pipe can be used as the first exciting wave duct, thereon end opening, lower end closed,
Its bottom depth is longer 3 ~ 4m than the bottom depth of zero defect pile foundation.Then, it is arranged first in the side wall of zero defect pile foundation top end part
Acceleration transducer, the stress wave signal for detecting exciting source generation.
Step（2）In, exciting source is placed into the bottom of the first exciting wave duct, exciting source starts exciting, generates stress wave
Signal detects the time Tf that stress wave Mintrop wave reaches the first acceleration transducer by the first acceleration transducer.
Step（3）In, in the Zhou Tuzhong of pile foundation to be detected, the second exciting wave duct, the second exciting wave duct and the first exciting are set
The specification and fitting depth of wave duct are identical, the horizontal distance and step of the second exciting wave duct and pile foundation to be detected（1）In first
Exciting wave duct is equal with the horizontal distance of zero defect pile foundation.Then, accelerate in the side wall of pile foundation top end part to be detected setting second
Sensor is spent, the stress wave signal for detecting exciting source generation, the height and step of the second acceleration transducer（1）In first
The height of acceleration transducer is equal.
Step（4）In, the bottom that exciting source is placed into the second exciting wave duct carries out exciting, generates stress wave signal, leads to
Cross the time Ts that the second acceleration transducer detection stress wave Mintrop wave reaches the second acceleration transducer；
Step（5）In, data analyzer judges that the pile foundation to be detected whether there is pile defect according to the difference of Tf and Ts, if
The absolute value of the difference of Tf and Ts is less than or equal to threshold value, judges that the pile foundation to be detected whether there is pile defect, enters step
（6）；Otherwise, judge that pile defect is not present in the pile foundation to be detected, terminate the measurement of the device to be detected.Wherein, which can
To be determined according to the detection error of acceleration transducer.
Step（6）In, exciting source is pressed into certain spacing by the nozzle of the second exciting wave duct from top to bottom and is transferred, under every
It is put into position at one, exciting source starts exciting, generates stress wave signal.Preferably, can for example be arranged step-length be interval 0.3m,
0.4m 0.5m depth generates accumulation signal, acquisition that can be by depth counter to exciting source location information, depth gauge
Number device exports collected exciting source location information to data analyzer.
Step（7）In, when each exciting of exciting source, the second acceleration transducer obtains stress wave signal.
Step（8）In, data analyzer receives the position letter of the detection signal of second acceleration transducer, exciting source
The detection signal of breath, m- depth oscillogram when making, according to when m- depth oscillogram in Mintrop wave slope-inversion point position, determine
The position of pile defect.
Subsequently into step（9）, terminate the measurement process of the pile foundation to be detected.
The pile defect detection method of second embodiment of the invention includes the following steps referring to Fig. 2：（1）In zero defect stake
First exciting wave duct is set in the soil around pile of base, and the first acceleration transducer is arranged in the side wall in pile foundation top end part；（2）By exciting
The bottom that source is placed into the first exciting wave duct carries out exciting, and detecting stress wave Mintrop wave by the first acceleration transducer reaches first
The time Tf of acceleration transducer；（3）Second exciting wave duct is set in the Zhou Tuzhong of pile foundation to be detected, on pile foundation top to be detected
The second acceleration transducer is arranged in the side wall in portion；（4）The bottom that exciting source is placed into the second exciting wave duct carries out exciting, passes through
Second acceleration transducer detects the time Ts that stress wave Mintrop wave reaches the second acceleration transducer；（5）According to the difference of Tf and Ts
Value judges that the pile foundation to be detected whether there is pile defect, is entered step if there is pile defect（6）；If there is no pile body
Defect enters step（11）；（6）Difference measurement column is set beside the exciting wave duct；（7）In the difference measurement top end
Difference acceleration transducer is arranged in the side wall in portion；（8）Exciting source is pressed centainly from top to bottom by the nozzle of the second exciting wave duct
Spacing decentralization, often transfer to position at one, exciting source starts exciting；（9）When each exciting of exciting source, the second acceleration sensing
Device and difference acceleration transducer obtain stress wave signal；（10）Data analyzer receives second acceleration transducer
Signal, the location information of exciting source and the detection signal of the differential sensor are detected, determines the pile body in pile foundation to be detected
The position of defect；（11）Terminate the quality testing of the pile foundation to be detected.
Specifically, the step of second embodiment（1）It arrives（5）The step of with first embodiment（1）It arrives（5）It is identical.
Step（6）In, difference measurement column is set beside the second exciting wave duct, and difference measurement column and the second exciting wave duct are flat
Row, depth and length also with the depth and equal length of pile foundation to be detected.The position of difference measurement column is set, itself and exciting are made
The horizontal distance of wave duct and pile foundation to be detected are equal with the horizontal distance of the second exciting wave duct.It is arrived to make stress wave pass through soil layer
Equal up to pile foundation to be detected and the propagation path for reaching difference measurement column, the propagation time is also identical.Whole reinforcing bar can be used
As difference measurement column, to make stress wave be more than the propagation speed in pile foundation to be detected in the spread speed of difference measurement column
Degree.
Step（7）In, difference acceleration transducer is arranged in the side wall in difference measurement capital end, for detecting exciting source
The stress wave signal of generation, the stress wave travel to difference acceleration transducer by layer of ground soil and difference measurement column.If
The level height for setting difference acceleration transducer is equal with the level height of the second acceleration transducer, to make stress wave wait for
The propagation distance of detection of pier foundation and the propagation distance of difference measurement column are equal.
Step（8）In, exciting source is pressed into certain spacing by the nozzle of the second exciting wave duct from top to bottom and is transferred, under every
It is put into position at one, exciting source starts exciting, generates stress wave signal.Stress wave passes through the ground of same path length soil respectively
Es-region propagations are then propagate into the second acceleration transducer and difference acceleration sensing to pile foundation to be detected and difference measurement column
Device.Preferably, it is that interval 0.3m, 0.4m or 0.5m depth generates accumulation signal that step-length, which can for example be arranged, can pass through depth
Acquisition of the counter to exciting source location information is spent, depth counter exports collected exciting source location information to data point
Analyzer.
Step（9）In, when each exciting of exciting source, the detection of the second acceleration transducer passes through layer of ground soil and to be detected
Pile foundation travels to the stress wave signal of its position；The detection of difference acceleration transducer is passed by layer of ground soil and difference measurement column
Its position stress wave signal broadcast.Acceleration transducer and difference acceleration transducer send data analysis to by signal is detected
Instrument 60.
Step（10）In, data analyzer receives the location information of the detection signal of the second acceleration transducer, exciting source
And the detection signal of difference acceleration transducer, determine the position of the pile defect in pile foundation to be detected.Specifically, data
Analyzer initially reaches the time of difference acceleration transducer according to the detection signal of difference acceleration transducer, identified sign wave
t1；By the detection time t2 of the second acceleration transducer received, subtracts the stress wave and initially reach difference acceleration biography
The time t1 of sensor, obtains Differential time t；Data analyzer is according to exciting Depth, Differential time t, and when corresponding difference
Between t detection time t2 brief acceleration sensors detection signal amplitude, generate Differential time-depth oscillogram, according to difference
When m- depth oscillogram determine the position of Mintrop wave slope-inversion point, then the corresponding depth of Mintrop wave slope-inversion point is pile defect institute
Position.
Then, it enters step（11）, terminate the measurement process of the pile foundation to be detected.
In the above embodiment of the present invention, pass through the Mintrop wave of the Mintrop wave time and standard pile foundation that arrive pile measurement to be detected
Time compares, and is all the presence of pile defect so as to predefine pile foundation, when pile defect is not present in pile foundation, then not logical
The exciting source for crossing different location determines the position of pile defect, in the case of same detection result, can improve detection effect
Rate reduces detection time.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the scope of the present invention.This hair
Particular features, structures, materials, or characteristics described in bright can be in any one or more of the embodiments or examples with suitable
Mode combines.In addition, without conflicting with each other, those skilled in the art can be by difference described in this specification
The feature of embodiment or example and different embodiments or examples is combined.It is all the spirit and principles in the present invention it
Interior any modification, equivalent replacement, improvement and so on, are included within the scope of protection of the present invention.
Claims (5)
1. a kind of pile defect detection method, includes the following steps：（1）First exciting is set in the soil around pile of zero defect pile foundation
The first acceleration transducer is arranged in wave duct, the side wall in pile foundation top end part；（2）Exciting source is placed into the bottom of the first exciting wave duct
Portion carries out exciting, and the time Tf that stress wave Mintrop wave reaches the first acceleration transducer is detected by the first acceleration transducer；（3）
Second exciting wave duct is set in the Zhou Tuzhong of pile foundation to be detected, the side wall in pile foundation top end part to be detected is arranged the second acceleration and passes
Sensor；（4）The bottom that exciting source is placed into the second exciting wave duct carries out exciting, and stress is detected by the second acceleration transducer
Wave Mintrop wave reaches the time Ts of the second acceleration transducer；（5）Data analyzer judges that this is to be detected according to the difference of Tf and Ts
Pile foundation whether there is pile defect, be entered step if there is pile defect（6）；It is entered step if there is no pile defect
（9）；（6）Exciting source is pressed certain spacing by the nozzle of the second exciting wave duct from top to bottom to transfer, often transfers to position at one
It sets, exciting source starts exciting；（7）When each exciting of exciting source, the second acceleration transducer obtains stress wave signal；（8）Data
Analyzer receive second acceleration transducer detection signal, exciting source location information detection signal, it is m- when making
Depth oscillogram, according to when m- depth oscillogram in Mintrop wave slope-inversion point position, determine the position of pile defect；（9）Terminate
The quality testing of the pile foundation to be detected.
2. pile defect detection method according to claim 1, it is characterised in that：The pile foundation to be detected with it is described intact
Specification and the depth for falling into pile foundation are identical.
3. pile defect detection method according to claim 2, it is characterised in that：The step（3）In, the second exciting wave
Horizontal distance and the step of the pipe with pile foundation to be detected（1）In the first exciting wave duct and zero defect pile foundation horizontal distance phase
Deng.
4. pile defect detection method according to claim 3, it is characterised in that：The step（3）In, the second acceleration
The height of sensor and the step（1）In the second acceleration transducer height it is equal.
5. pile defect detection method according to claim 4, it is characterised in that：The step（5）In, if Tf and Ts
Difference absolute value be less than or equal to threshold value, judge the pile foundation to be detected whether there is pile defect；Otherwise, judge that this is to be checked
Pile defect is not present in pile base.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810422410.3A CN108560617B (en) | 2018-05-05 | 2018-05-05 | Pile body defect detection method |
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|---|---|---|---|
| CN201810422410.3A CN108560617B (en) | 2018-05-05 | 2018-05-05 | Pile body defect detection method |
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| CN108560617B CN108560617B (en) | 2020-10-30 |
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| CN201810422410.3A Active CN108560617B (en) | 2018-05-05 | 2018-05-05 | Pile body defect detection method |
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| CN109469114A (en) * | 2018-11-23 | 2019-03-15 | 中国建筑科学研究院有限公司 | A kind of method for the existing foundation pile integrity of low strain integrity testing that can eliminate superstructure influence |
| CN111595777A (en) * | 2020-05-29 | 2020-08-28 | 海安东大岩土桩基工程检测有限公司 | Novel reflected wave pile foundation detection method |
| CN112459142A (en) * | 2020-12-06 | 2021-03-09 | 江龙 | Construction engineering supervision pile foundation defect excitation detection method |
| CN118191108A (en) * | 2024-05-13 | 2024-06-14 | 广东惠和工程检测有限公司 | Pile foundation integrity detection device and method |
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| CN107119729A (en) * | 2017-05-04 | 2017-09-01 | 绵阳市川交公路规划勘察设计有限公司 | A kind of low strain dynamic coordinates the method that ultrasonic wave carries out foundation pile integrity detection |
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| EP1323869A1 (en) * | 2001-12-27 | 2003-07-02 | Mitsubishi Denki Kabushiki Kaisha | Dynamic test method for bearing capacity of piles |
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| CN109469114A (en) * | 2018-11-23 | 2019-03-15 | 中国建筑科学研究院有限公司 | A kind of method for the existing foundation pile integrity of low strain integrity testing that can eliminate superstructure influence |
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| CN118191108A (en) * | 2024-05-13 | 2024-06-14 | 广东惠和工程检测有限公司 | Pile foundation integrity detection device and method |
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|---|---|
| CN108560617B (en) | 2020-10-30 |
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