CN108442419A - Building foundation detection device and detection method - Google Patents
Building foundation detection device and detection method Download PDFInfo
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- CN108442419A CN108442419A CN201810248778.2A CN201810248778A CN108442419A CN 108442419 A CN108442419 A CN 108442419A CN 201810248778 A CN201810248778 A CN 201810248778A CN 108442419 A CN108442419 A CN 108442419A
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- exciting
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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 building foundation quality detection device, including：First shockwave sensor is set to foundation pile top-side；Second shockwave sensor is set to below the first shockwave sensor；Exciting wave duct is set in the drilling beside foundation pile；Exciting source can move up and down in exciting wave duct；Exciting source interval carries out exciting specifically to be moved down along exciting wave duct apart from step-length, which is equal to the distance of the first shockwave sensor and the second shockwave sensor；For exciting source when carrying out exciting, the first shockwave sensor and the second shockwave sensor measure stress wave signal；Data analyzer determines building foundation quality according to the Mintrop wave time of the first shockwave sensor described in a position on the Mintrop wave time of the second shockwave sensor described in exciting source current location and exciting source.
Description
Technical field
The present invention relates to a kind of basic detection devices, more particularly, to civil engineering structure pile detection device and inspection
Survey method.
Background technology
Foundation pile plinth has been widely applied as a kind of Deep Foundation Structure form in field of civil engineering.Foundation pile plinth energy
It is enough that the dead weight of superstructure and the load born are transmitted in the steady soil contacted with foundation pile plinth, therefore largely
Reduce basis sedimentation and building differential settlement.Foundation pile plinth 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.
Foundation pile plinth 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 foundation pile 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 detection 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 foundation inspection 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 for becoming detection pile 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 quality inspection of the piles device of exciting, is arranged exciting source, by setting in the soil around pile of foundation pile side in a kind of side inspecting hole
Set the stress wave signal in the sensor detection transmission of foundation pile 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 foundation pile.
But in this method, need to measure exciting source into each depth life successively from foundation pile top lower section to foundation pile bottom
At stress wave signal, m- depth oscillogram, can determine the position of the pile defect in foundation pile when ultimately producing；Step
It is complicated and can not determine that the corresponding foundation pile of exciting Depth whether there is pile defect in real time in detection process.
Invention content
Improvement of the present invention as the prior art provides a kind of civil engineering structure pile detection device and method,
Generated time-depth oscillogram can not be needed, can find pile defect in real time in detection process.
As one aspect of the present invention, a kind of building foundation quality detection device is provided, including：First stress wave passes
Sensor is set to foundation pile top-side；Second shockwave sensor is set to below the first shockwave sensor；Exciting
Wave duct is set in the drilling beside foundation pile；Exciting source can be moved up and down by cable in exciting wave duct；Data
Analyzer determines the quality condition of foundation pile for analyzing processing；The exciting source interval apart from step-length along described specifically to swash
Vibration wave pipe moves down and carries out exciting, and the specific distance is equal to first shockwave sensor and the second stress wave
The distance of sensor；The exciting source is when carrying out exciting, first shockwave sensor and the second shockwave sensor
Measure stress wave signal；The data analyzer is according to Mintrop wave time of the second shockwave sensor described in exciting source current location
And on exciting source the first shockwave sensor described in a position the Mintrop wave time, determine building foundation quality.
Preferably, the data analyzer calculates the Mintrop wave time of the second shockwave sensor described in exciting source current location
And on exciting source the difference of the Mintrop wave time of the first shockwave sensor described in a position absolute value, the value be less than setting
When threshold value, judge that pile defect is not present on exciting source current location and exciting source between a position；It is more than setting threshold in the value
When value, judge that there are pile defects between a position on exciting source current location and exciting source.
Preferably, the setting threshold value is determined according to the accuracy of detection of shockwave sensor.
Preferably, the exciting wave duct is pvc pipe.
As another aspect of the present invention, a kind of building foundation quality determining method is provided, is included the following steps：
（1）In foundation pile top-side, the first shockwave sensor is set；（2）Under the first shockwave sensor described in foundation pile top-side
The second shockwave sensor of side's setting；（3）Soil around pile drilling by foundation pile, is arranged exciting wave duct in the borehole；（4）With first
The distance between shockwave sensor and the second shockwave sensor are step-length, by cable by exciting source along exciting wave duct
It moves down and carries out exciting；（5）In exciting source when each position carries out exciting, first shockwave sensor and the
Two shockwave sensors measure stress wave signal；（6）Data analyzer is passed according to the second stress wave described in exciting source current location
The Mintrop wave time of the first shockwave sensor described in a position, determines building foundation on the Mintrop wave time of sensor and exciting source
Quality.
Preferably, the step（6）In, data analyzer calculates the second shockwave sensor described in exciting source current location
The Mintrop wave time and exciting source on the first shockwave sensor described in a position the Mintrop wave time difference absolute value, at this
When value is less than setting threshold value, judge that pile defect is not present on exciting source current location and exciting source between a position；In the value
When more than setting threshold value, judge that there are pile defects between a position on exciting source current location and exciting source.
Description of the drawings
Fig. 1 is the schematic diagram of the building foundation quality detection device of the embodiment of the present invention.
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 building foundation quality detection device of the embodiment of the present invention, referring to Fig. 1, including the first shockwave sensor 10,
Second shockwave sensor 20, exciting wave duct 30, exciting source 40 and data analyzer 50.
First shockwave sensor 10 and the second shockwave sensor 20 can be that velocity sensor or acceleration pass
Sensor is respectively arranged at the side wall of 100 top end part of foundation pile, for detecting the stress wave signal relayed to its position.Wherein,
One shockwave sensor is located on the second shockwave sensor, and interval specific range, the specific range can be exciting source
40 step-length below exciting wave duct 30, such as 0.5m.
Exciting wave duct 30 is set in the drilling of 100 side of foundation pile, and parallel with foundation pile 100.Exciting wave duct 30 can be with
Using pvc pipe, end opening thereon, lower end closed.The horizontal distance of exciting wave duct 30 and foundation pile 100 is 1 ~ 2m, bottom depth
It is longer 3 ~ 4m than the bottom depth of foundation pile 100.
Exciting source 40 can be moved up and down by cable in exciting wave duct 30, in the difference of exciting wave duct 30
Depth carries out exciting.Acquisition that can be by depth counter to 40 location information of exciting source, depth counter will be collected
Exciting source location information is exported to data analyzer 50.The step-length that exciting source 40 moves in exciting wave duct 30 is equal to the first stress
The distance between wave sensor 10 and the second shockwave sensor 20.To make exciting source 40 generate exciting letter in current location 31
Number when, the propagation distance of the second shockwave sensor of stress wave propagation 20, be equal to exciting source 40 a upper position 32 generate exciting
When signal, the propagation distance of the first shockwave sensor of stress wave propagation 10.Stress wave is in 100 communication process of pile foundation, when sharp
When pile defect is not present in vibration source 40 between current location and a upper position, propagation distance is equal, then stress wave reaches
The time of first shockwave sensor 10 is equal to the time for reaching the second shockwave sensor 20；When exciting source 40 is in current location
And there are when pile defect 110 between a upper position, the influence due to pile defect 100 for Spreading Velocity of Stress Wave is led
Its spread speed is caused to become smaller, but propagation distance is equal, then stress wave reaches the first stress wave by pile body in a upper position and passes
The time of sensor 10 is less than the time that stress wave reaches the second shockwave sensor 20 in current location by pile body.
Data analyzer 50 determines the quality condition of foundation pile 100 for analyzing processing, judges that the pile body in foundation pile 100 lacks
Sunken position.Specifically, data analyzer 50 calculate 40 current location 31 of exciting source when the second shockwave sensor 20 Mintrop wave
The absolute value of the difference of the Mintrop wave time of first shockwave sensor of position 10, is less than in the value on time and exciting source 40
When threshold value is arranged, judge that pile defect is not present on 40 current location of exciting source and exciting source 40 between a position；It is big in the value
When threshold value is set, judge that there are pile defects between a position on 40 current location of exciting source and exciting source 40.The threshold value can
To be determined according to the accuracy of detection of shockwave sensor.
The building foundation quality determining method of the embodiment of the present invention, includes the following steps：（1）In 100 top side of foundation pile
The first shockwave sensor 10 is arranged in face；（2）Setting second is answered below 100 the first shockwave sensor of top-side 10 of foundation pile
Wave sensor 20；（3）Soil around pile drilling on 100 side of foundation pile, is arranged exciting wave duct 30 in the borehole；（4）With the first stress
The distance between wave sensor 10 and the second shockwave sensor 20 are step-length, by cable by exciting source 40 along exciting wave
Pipe 30 moves down and carries out exciting；（5）Exciting source 40 each position carry out exciting when, the first shockwave sensor 10 with
And second shockwave sensor 20 measure stress wave signal；（6）Second stress wave when data analyzer 40 current location of exciting source
On the Mintrop wave time of sensor 20 and exciting source 40 when a position the first shockwave sensor 10 the Mintrop wave time, calculate exciting
First stress wave of position passes on the Mintrop wave time of the second shockwave sensor 20 and exciting source 40 when 40 current location 31 of source
The absolute value of the difference of the Mintrop wave time of sensor 10 judges 40 current location of exciting source and swashs when the value is less than setting threshold value
Pile defect is not present on vibration source 40 between a position；The value be more than setting threshold value when, judge 40 current location of exciting source with
There are pile defects between a position on exciting source 40.The threshold value can be determined according to the accuracy of detection of shockwave sensor.
Compared with prior art, building foundation detection device and detection method through the embodiment of the present invention, can
The stress wave signal of the node of the position need not be obtained, Production Time-depth oscillogram can be real-time in detection process
It was found that pile defect, to improve detection efficiency.
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 (6)
1. a kind of building foundation quality detection device, including：First shockwave sensor is set to foundation pile top-side；
Second shockwave sensor is set to below the first shockwave sensor；Exciting wave duct, the drilling being set to beside foundation pile
It is interior；Exciting source can be moved up and down by cable in exciting wave duct；Data analyzer determines foundation pile for analyzing processing
Quality condition；It is characterized in that：The exciting source interval specifically to be moved down along the exciting wave duct apart from step-length and
Exciting is carried out, the specific range is equal to the distance of first shockwave sensor and the second shockwave sensor；It is described
For exciting source when carrying out exciting, first shockwave sensor and the second shockwave sensor measure stress wave signal；Institute
Data analyzer is stated according to one on the Mintrop wave time of the second shockwave sensor described in exciting source current location and exciting source
The Mintrop wave time for setting first shockwave sensor, determine building foundation quality.
2. building foundation quality detection device according to claim 1, it is characterised in that：The data analyzer calculates
First stress wave described in a position on the Mintrop wave time of second shockwave sensor described in exciting source current location and exciting source
The absolute value of the difference of the Mintrop wave time of sensor judges exciting source current location and exciting when the value is less than setting threshold value
Pile defect is not present on source between a position；When the value is more than setting threshold value, exciting source current location and exciting source are judged
There are pile defects between a upper position.
3. building foundation quality detection device according to claim 2, it is characterised in that：The setting threshold value is according to answering
The accuracy of detection of wave sensor determines.
4. building foundation quality detection device according to claim 2, it is characterised in that：The exciting wave duct is PVC
Pipe.
5. a kind of building foundation quality determining method, includes the following steps：（1）In foundation pile top-side, the first stress wave is set
Sensor；（2）Second shockwave sensor is set below the first shockwave sensor described in foundation pile top-side；（3）In base
The other soil around pile drilling of stake, is arranged exciting wave duct in the borehole；（4）With the first shockwave sensor and the second stress wave sensing
The distance between device is step-length, and exciting is carried out by cable moves down exciting source along exciting wave duct；（5）In exciting source
When each position carries out exciting, first shockwave sensor and the second shockwave sensor measure stress wave signal；
（6）Data analyzer is according to one on the Mintrop wave time of the second shockwave sensor described in exciting source current location and exciting source
The Mintrop wave time for setting first shockwave sensor, determine building foundation quality.
6. building foundation quality determining method according to claim 5, it is characterised in that：The step（6）In, data
Analyzer calculates on the Mintrop wave time of the second shockwave sensor and exciting source described in exciting source current location described in a position
The absolute value of the difference of the Mintrop wave time of first shockwave sensor judges that exciting source is current when the value is less than setting threshold value
Pile defect is not present on position and exciting source between a position；When the value is more than setting threshold value, exciting source present bit is judged
Set between a position on exciting source that there are pile defects.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810248778.2A CN108442419B (en) | 2018-03-25 | 2018-03-25 | Building foundation detection device and detection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810248778.2A CN108442419B (en) | 2018-03-25 | 2018-03-25 | Building foundation detection device and detection method |
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| Publication Number | Publication Date |
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| CN108442419A true CN108442419A (en) | 2018-08-24 |
| CN108442419B CN108442419B (en) | 2019-09-06 |
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| CN201810248778.2A Active CN108442419B (en) | 2018-03-25 | 2018-03-25 | Building foundation detection device and detection method |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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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 |
| CN111042215A (en) * | 2018-10-15 | 2020-04-21 | 广州市市政工程试验检测有限公司 | Existing building foundation pile quality detection method and device |
| CN111638269A (en) * | 2020-05-26 | 2020-09-08 | 浙江大学 | Pile side pressing-in probe transmitted wave detection method for high bearing platform pile quality detection |
| CN111851607A (en) * | 2020-07-09 | 2020-10-30 | 广东雄炜建筑工程检测有限公司 | Construction engineering foundation pile detection method |
| CN113835122A (en) * | 2021-09-30 | 2021-12-24 | 中铁二十四局集团有限公司 | Method for determining pile side position by using pile side hole reflection wave method |
| CN117871293A (en) * | 2024-03-11 | 2024-04-12 | 四川嘉乐地质勘察有限公司 | Self-correction-based high strain force detection method and detection device |
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| CN117871293A (en) * | 2024-03-11 | 2024-04-12 | 四川嘉乐地质勘察有限公司 | Self-correction-based high strain force detection method and detection device |
| CN117871293B (en) * | 2024-03-11 | 2024-05-28 | 四川嘉乐地质勘察有限公司 | Self-correction-based high strain force detection method and detection device |
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