CN110173006A - The stake top of foundation pile, Kong Zhongshuan measuring point low strain integrity test device and method - Google Patents
The stake top of foundation pile, Kong Zhongshuan measuring point low strain integrity test device and method Download PDFInfo
- Publication number
- CN110173006A CN110173006A CN201910400467.8A CN201910400467A CN110173006A CN 110173006 A CN110173006 A CN 110173006A CN 201910400467 A CN201910400467 A CN 201910400467A CN 110173006 A CN110173006 A CN 110173006A
- Authority
- CN
- China
- Prior art keywords
- sensor
- hole
- stake top
- pile
- defect
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000012360 testing method Methods 0.000 title claims abstract description 29
- 230000007547 defect Effects 0.000 claims abstract description 67
- 238000001514 detection method Methods 0.000 claims abstract description 22
- 238000012545 processing Methods 0.000 claims abstract description 13
- 230000001133 acceleration Effects 0.000 claims abstract description 6
- 230000004044 response Effects 0.000 claims description 9
- 238000011016 integrity testing Methods 0.000 claims description 8
- 230000002787 reinforcement Effects 0.000 claims description 6
- 229910000831 Steel Inorganic materials 0.000 claims description 5
- 239000010959 steel Substances 0.000 claims description 5
- 238000009527 percussion Methods 0.000 claims description 3
- 238000010079 rubber tapping Methods 0.000 claims description 3
- 239000002689 soil Substances 0.000 claims 1
- 230000005540 biological transmission Effects 0.000 abstract description 6
- 238000004445 quantitative analysis Methods 0.000 abstract description 2
- 230000010355 oscillation Effects 0.000 abstract 1
- 230000008859 change Effects 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 239000002775 capsule Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 210000001367 artery Anatomy 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000012372 quality testing Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 210000003462 vein Anatomy 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Abstract
The invention discloses a kind of stake tops of foundation pile, Kong Zhongshuan measuring point low strain integrity test device and method, including acceleration transducer, built-in pipe, air bag fixed device, gas tube, air-stopping valve, air charging system, clump weight, sensor lead and data acquisition processing device with a scale.Acceleration transducer used by the present apparatus includes sensor in a stake top sensor and a hole, stake top sensor is placed on stake top, sensor then passes through embedding pipe fittings and hangs into stake in hole, after acceleration transducer reaches designated position in hole, its position in pipe is fixed using the fixed device of air bag.When carrying out pile detection using the present invention, stake top is tapped using pulse hammer, the result of oscillation of two measuring points is analyzed, to achieve the purpose that measure concrete velocity of wave, stake is long and pile defect quantitative analysis for detection.The advantages of present invention incorporates traditional Low Strain Dynamic Testing of Piles method and sound wave transmission methods has the characteristics that quick, economical, lossless.
Description
Technical field
The invention belongs to testing equipment fields, and in particular to a kind of stake top of foundation pile, Kong Zhongshuan measuring point low strain dynamic integrality
Detection device and method.
Background technique
Pile foundation is constantly subjected to the concern of engineering circles as a kind of most important base form, quality testing.At home
In dynamic pile detection, relatively common and representative is low strain dynamic back wave detection method and sound wave transmission method.
Traditional low strain integrity testing method only places a sensor in stake top, when detection stake is long, is on the one hand likely to occur
Stake bottom is too deep so that sensor can not receive reflection wave at the bottom of pile, the usual root of concrete velocity of wave used when on the other hand calculating
It is arranged according to experience, there is large error, causing calculated result with actual conditions, there are bigger differences.
Acoustic wave transmission rule places transmitting terminal and receiving end in pre-buried sound detecting pipe, is passed in concrete by surveying sound wave
When the sound broadcast, velocity of wave etc. detects pile body integrity.This method has the disadvantage in that first, occurs on the outside of sound detecting pipe
When defect or even main reinforcement are exposed, this method can not be detected.Second, when sound detecting pipe part packet mud, concrete disintegration etc., it will lead to office
The failure of portion's measuring point.
The advantages of present invention incorporates traditional low strain integrity testing method and sound wave transmission methods, on the basis of low strain integrity testing method
On, a sensor is placed in stake top, recycles built-in pipe that another sensor is placed in inside pile body, according to sensor lead
Decentralization length determine that the sensor places depth and in conjunction with the testing result of sensor in stake top sensor and hole reaches more quasi-
True detection is to the concrete elastic longitudinal wave velocity of test pile, stake is long or the purpose of pile body integrity.
Summary of the invention
It is an object of the invention to solve problems of the prior art, and propose a kind of stake top of foundation pile, Kong Zhongshuan
Measuring point low strain integrity test device and method.The present invention senses one on the basis of traditional low strain integrity testing method
Device is placed in stake top, recycles built-in pipe that another sensor is placed in inside pile body, true according to the decentralization length of sensor lead
The fixed sensor places depth.In conjunction with the testing result of sensor in stake top sensor and hole, reach more accurately detect it is to be measured
The concrete elastic longitudinal wave velocity of foundation pile, stake be long or the purpose of pile body integrity.
The present invention takes following technical scheme:
A kind of stake top of foundation pile, Kong Zhongshuan measuring point low strain integrity test device comprising stake top sensor, Kong Zhongchuan
Sensor, built-in pipe, air bag fixed device, gas tube, air-stopping valve, air charging system；Built-in pipe described at least one is vertically buried
In in the steel reinforcement cage of cast-in-place concrete pile；Sensor is acceleration transducer in the stake top sensor and hole, and stake top passes
Sensor is fixed on the stake top of cast-in-place concrete pile, and sensor is located in built-in pipe in hole, and there is for facing covers disposed on sensor in hole
When the fixed fixed device of air bag, the fixed device of the air bag is the closed air bag with inflating port, and air pocket rings are wrapped
It is wrapped in sensor external in hole, inflating port is placed in the air charging system outside foundation pile by gas tube connection, and sets on gas tube
There is air-stopping valve；The stake top sensor passes through sensor lead with sensor in hole respectively and connects external data acquisition process
Device.
Preferably, sensor lower surface is hung with clump weight in the hole.
Preferably, the built-in pipe has a plurality of, it is distributed in the different location of cast-in-place concrete pile cross section.
Preferably, the pre-buried bore need to be greater than the maximum outside diameter of sensor in hole, but it is less than sensor in hole
With the sum of the maximum outside diameter of the fixed device of air deflating state lower gasbag.
Preferably, the sensor lead is equipped with scale.
Preferably, further including the pulse hammer tapped for the stake top to cast-in-place concrete pile.
Preferably, the data acquisition processing device is dynamic tester device.
Preferably, the air charging system is inflator or inflator pump, kept between gas tube and the inflating port of air bag
It is completely closed.
In the present invention, it is subsequent for ease of description, defining necking down defect is that a certain position occurs relative to other in pile body
The defect of position reduced cross-sectional area.To in terms of the direction of bottom at the top of the foundation pile, the cross-sectional area of necking down defect top position from
Top to bottm reduces suddenly, therefore this position is known as bottleneck；Similarly, the cross-sectional area of neck defect bottom position is unexpected from top to bottom
Expand, therefore this position is known as expanding at neck.
Another object of the present invention is to provide a kind of stake tops using detection device described in any of the above-described scheme, Kong Zhongshuan
Measuring point low strain integrity test method, the concrete velocity of wave of foundation pile, stake be long and pile body integrity for detecting, and step is such as
Under:
1) stake top sensor is fixed on to the stake top position of cast-in-place concrete pile, recycles sensor lead that will sense in hole
Device is hung onto built-in pipe, and the difference in height of sensor is z in stake top sensor and hole；Using air charging system to the fixed device of air bag
It is inflated, expands air bag and is pressed in pre-buried inside pipe wall, be then shut off air-stopping valve, sensor in hole is made to be fixed on built-in pipe
Tube wall on；
2) it is tapped using stake top of the pulse hammer to cast-in-place concrete pile, stake top is acquired by data acquisition processing device
The response data of sensor in sensor and hole；
3) the vibratory response time difference Δ t that sensor taps this in stake top sensor and hole is calculated0, obtain the coagulation
Concrete velocity of wave is in native bored concrete pile
4) the time difference Δ t that the incidence that sensor receives after this percussion in hole involves reflection wave at the bottom of pile is calculated1, obtain
Overall length to stake is
5) integrality that sensor character of reflection wave in the stake top sensor and hole of acquisition judges pile body is tapped according to this:
If sensor receives only reflection wave at the bottom of pile in stake top sensor and hole, judge that there is no defect, pile bodies in current foundation pile
Completely；If sensor is in addition to receiving reflection wave at the bottom of pile in stake top sensor or hole, the feature reflection of pile defect is also received
When wave, judge that existing defects in current foundation pile, pile body are imperfect；
6) further sentenced for there are the cast-in-place concrete piles of necking down defect according to the character of reflection wave of sensor in hole
The location of disconnected necking down defect:
If sensor receives only the feature back wave for expanding the feature back wave at neck without receiving bottleneck in hole,
Then judge that sensor present position is the location of defect in current hole；
If sensor can receive bottleneck and expand the feature back wave at neck in hole, the location of defect is judged
In hole below sensor；
If the feature that sensor had both been not received by the feature back wave of bottleneck or had been not received by expansion neck in hole is anti-
Ejected wave then judges that the location of defect is located in hole above sensor；
7) according to the judging result of step 6), if not in the location of defect, open air-stopping valve makes sensor in hole
It is after the fixed device of air bag loses heart, sensor in hole is mobile towards the location of defect, step 2)~6 are then repeated again), directly
To determining the location of defect.
Preferably, being received for the cast-in-place concrete pile of existing defects based on sensor in stake top sensor and hole
Incidence involve back wave vibration amplitude, the severity of defect is further judged according to one-dimensional wave theory.
Compared with the existing technology, the invention has the following advantages that
1. the advantages of present invention incorporates traditional Low Strain Dynamic Testing of Piles method and sound wave transmission methods, in low strain integrity testing method
On the basis of, a sensor is placed in stake top, recycles built-in pipe that another sensor is placed in inside pile body, according to sensing
The decentralization length of device lead determines that the sensor is placed depth and reached in conjunction with the testing result of sensor in stake top sensor and hole
To more accurate detection to the concrete elastic longitudinal wave velocity of test pile, stake is long or the purpose of pile body integrity.The present invention has
Quickly, the features such as economic, lossless.
2. the present invention can relatively accurately detect pile concrete velocity of wave, and more compared to traditional low strain integrity testing method
Easily receive the back wave of depths, such as the feature back wave of the reflection wave at the bottom of pile of long stake, deep defect.
3. the present invention is able to detect that the defect occurred on the outside of built-in pipe (sound detecting pipe) compared to sound wave transmission method, and not
Influence vulnerable to local defect.
Detailed description of the invention
Fig. 1 is stake top, the vertical section schematic diagram of Kong Zhongshuan measuring point low strain integrity test device of foundation pile
Fig. 2 is stake top, the schematic top plan view of Kong Zhongshuan measuring point low strain integrity test device of foundation pile；
Fig. 3 is sensor and the fixed device detail drawing of air bag in hole；
Wherein, 1. stake top sensor, sensor in 2. holes, 3. built-in pipes, the fixed device of 4. air bags, 5. clump weights, 6.,
7. sensor lead, 8. data acquisition processing devices, 9. gas tubes, 10. air-stopping valves, 11. air charging systems.
Specific embodiment
The following further describes the present invention with reference to the drawings.
As illustrated in fig. 1 and 2, complete for the stake top of one of one embodiment of the invention foundation pile, Kong Zhongshuan measuring point low strain dynamic
Whole property detection device, the device include stake top sensor 1, the fixed device 4 of sensor 2, built-in pipe 3, air bag in hole, gas tube 9,
Air-stopping valve 10 and air charging system 11.The present invention is sensed one on the basis of traditional Low Strain Dynamic Testing of Piles, using built-in pipe 3
Device 2 is placed in inside pile body, can determine that sensor 2 places depth according to the decentralization length of sensor lead 7.It is tapped using pulse hammer
Sensor receives pile body Vibration Condition and passes to data acquisition processing device by lead in stake top, stake top and hole, for pair
As a result it is analyzed.When detecting pile body integrity, by changing the placement depth of sensor in hole, to change itself and defect
Relative position.When the relative position of sensor in hole and defect changes, received defect characteristic back wave
Can be different, in conjunction with the testing result of stake top sensor, so that it may reach the mesh of quantitative analysis defect present position and degree
's.The specific implementation structure of the detection device is described below in detail.
Inbuilt built-in pipe 3 has one or more in cast-in-place concrete pile 6, and built-in pipe 3 is vertical before concreting
It is embedded in the steel reinforcement cage of foundation pile, is poured together with steel reinforcement cage.After concreting, built-in pipe 3 is cured in foundation pile
It is interior.Theoretically a built-in pipe 3 can complete basic detection function, but in view of the accuracy of detection, and pouring can before foundation pile
In the more built-in pipes 3 of setting in steel reinforcement cage one week, to carry out multimetering, reduce error in measurement.In the apparatus, stake top sensor
1 and hole in sensor 2 be acceleration transducer, wherein stake top sensor 1 is fixed on the stake top of cast-in-place concrete pile 6, is used for
The wave signal of stake top position is detected, sensor 2 is located in built-in pipe 3 in hole, different deep for detecting 6 inside of cast-in-place concrete pile
The wave signal of degree.Due to usually there is water in built-in pipe 3, what sensor 2 can generally work under water in hole needed for the present apparatus adds
Velocity sensor.Moreover, position of the sensor 2 in built-in pipe 3 should be adjustable in hole, but sensor 2 is in hole
Induction wave signal, and need to be formed with built-in pipe 3 and conduct, i.e., when in hole sensor 2 be moved to designated position in built-in pipe 3
When, it needs to fix it with tube wall, achievees the purpose that measure pile body Vibration Condition.Therefore one is equipped on sensor 2 in hole
The fixed device 4 of air bag for being fixed temporarily.As shown in figure 3, the fixed device 4 of air bag is the closed gas with inflating port
Capsule, for air pocket rings around being wrapped in hole outside sensor 2, inflating port connects the inflation being placed in outside foundation pile dress by gas tube 9
11 are set, and gas tube 9 is equipped with air-stopping valve 10.By the gas tube 9 can with the fixed device 4 of the air bag of sensor 2 in device to hole into
Row inflation/deflation, and the air-stopping valve on pipe, can be used the only gas sealers such as gas folder, air-stopping valve, by adjusting the switch of air-stopping valve 10,
The inflation/deflation of air bag is directly controlled, convenient for operation.In the detection process, air-stopping valve 10 is first opened, when sensor 2 reaches finger in hole
Positioning postpones, and is inflated using air charging system 11 to air bag, air bag expands and is pressed in 3 inner wall of built-in pipe, then by air-stopping valve 10
It closes, so that it may achieve the purpose that sensor and tube wall is fixed.When using finishing or sensor position need to be changed, then opens and stop
Air valve 10, discharge air is by balloon contraction, so that sensor is removable.Therefore, 3 internal diameter of built-in pipe need to be greater than in hole and sense
The maximum outside diameter of device 2, but it is less than the sum of the maximum outside diameter of sensor 2 and the fixed device 4 of air deflating state lower gasbag in hole, to lose heart
Subject to sensor 2 can be moved up and down freely in state lower opening.Since the device needs submerged to work, gas tube 9 with
It needs to be completely closed between the air bag inflating port of the fixed device 4 of air bag, guarantees its air-tightness, in case water enters air bag or can not fill
Gas.Sensor 2 connects external data acquisition processing device 8 by sensor lead 7 respectively in stake top sensor 1 and hole, will
The wave signal respectively sensed is transmitted in data acquisition processing device 8.Data acquisition processing device 8 can be all kinds of dynamic testers
Device has the function of oscillography and can realize that the instrument of frequency spectrum conversion and signal integration is preferred.
In addition, 2 lower surface of sensor can be hung with clump weight 5 in hole, it is suspended on 2 lower section of sensor in hole, can be with
It helps sensor to drop to designated depth, sensor lead 7 can also be made to stretch, it is consistent with sensor depth to reach unwrapping wire length
Purpose.It certainly, can not suspended counterweight block 5 if 2 own wt of sensor is enough.The effect of sensor lead 7 be on the one hand by
The data of sensor 2 are transmitted to data acquisition and procession device 8 in stake top sensor 1 and hole, further aspect is that as lifting rope to
Sensor 2 is hung in hole.Therefore, length scale can be drawn on sensor lead 7 to confirm that sensor 2 hangs depth in hole.
In addition, the detection device may be equipped with the pulse hammer tapped for the stake top to cast-in-place concrete pile 6.Arteries and veins
Block stamp can use existing device model, without limitation.
The application method of the device is as follows:
1. detected, a stake top sensor 1 is fixed on stake top, recycles sensor lead 7 by another hole
Middle sensor 2 is hung onto built-in pipe 3.
2. being inflated using air charging system 11 to the fixed device 4 of air bag after sensor 2 reaches designated position in hole, making gas
Capsule expands and is pressed in 3 inner wall of built-in pipe, and air-stopping valve 10 is closed.
3. tapping stake top using pulse hammer, sensor in stake top sensor 1 and hole is acquired by data acquisition processing device 8
2 vibratory responses received reach testing goal according to 2 position of sensor and Response Analysis result in hole.
4. according to detection needs, openable air-stopping valve 10, air bag 4 is discharged air and shrinks, so that sensor 2 is removable,
The position for further adjusting and changing sensor 2 in hole, repeats detecting step above-mentioned, to obtain more accurate testing result.
Below based on above-mentioned detection device, the present invention provides a kind of specific stake top, Kong Zhongshuan measuring point low strain dynamic integrality
Detection method, this method can be used for detecting long the concrete velocity of wave of foundation pile, stake and pile body integrity defective locations and defect journey
Degree, its step are as follows:
1) stake top sensor 1 is fixed on to the stake top position of cast-in-place concrete pile 6, recycles sensor lead 7 will be in hole
Sensor 2 is hung onto built-in pipe 3, sensor 2 in the calibration record stake top sensor 1 sprinkled by sensor lead 7 and hole
Difference in height be z.The fixed device 4 of air bag is inflated using air charging system 11, air bag is expanded and is pressed in built-in pipe 3
Wall is then shut off air-stopping valve 10, is fixed on sensor 2 in hole on the tube wall of built-in pipe 3.
2) it is tapped using stake top of the pulse hammer to cast-in-place concrete pile 6, passes through 8 collecting pile of data acquisition processing device
Push up the response data of sensor 2 in sensor 1 and hole；
3) vibratory response time difference that sensor 2 in stake top sensor 1 and hole taps this is calculated (i.e. to incidence wave
Response time is poor) Δ t0, obtaining concrete velocity of wave in the cast-in-place concrete pile 6 is
4) the time difference Δ t that the incidence that sensor 2 receives after this percussion in hole involves reflection wave at the bottom of pile is calculated1,
The overall length for obtaining stake is
5) 2 character of reflection wave of sensor in the stake top sensor 1 and hole of acquisition is tapped according to this and judges the complete of foundation pile
Property, specific judgment method are as follows:
If sensor 2 receives only reflection wave at the bottom of pile in stake top sensor 1 and hole, judge to be not present in current foundation pile
Defect, pile body are complete；
If sensor 2 is in addition to receiving reflection wave at the bottom of pile in stake top sensor 1 or hole, the feature of pile defect is also received
When back wave, judge that existing defects in current foundation pile, pile body are imperfect.In this case, there may be a variety of feelings for the defect
Condition can judge the type of defect according to the waveform of back wave.In general, necking down defect have to the bearing capacity of pile body it is larger
Negative effect, and expand neck defect and have a positive effect to the bearing capacity of stake, therefore can will expand neck and be not intended as defect, but to necking down
Defect carries out following further positions determinations and defect level detection, takes counter-measure so as to subsequent.
6) for there are the cast-in-place concrete piles 6 of necking down defect, according to the character of reflection wave of sensor 2 in hole, further
Judge the location of necking down defect.By taking ideal necking pile as an example, by adjusting the placement depth of sensor 2 in hole, change hole
Middle sensor 2 and the available different character of reflection wave in the relative position of defect.When sensor 2 is located on defect in hole
When, after tapping stake top, sensor 2 can receive bottleneck and expand the feature back wave at neck；When in hole sensor 2 be located at lack
When falling into place, the feature back wave expanded at neck can only be received；When sensor 2 is located at defect or less in hole, then cannot receive
To the feature back wave of defect.Can relatively accurately it be divided according to this feature in conjunction with the testing result of stake top sensor 1
Position existing for defect is precipitated.In the present embodiment, specific judgment mode is as follows:
If a, sensor 2 receives only feature reflection of the feature back wave expanded at neck without receiving bottleneck in hole
Wave then judges that 2 present position of sensor is the location of defect in current hole；
If b, sensor 2 can receive bottleneck and expand the feature back wave at neck in hole, judge locating for defect
Position is located at 2 lower section of sensor in hole；
If c, sensor 2 had both been not received by the feature back wave of bottleneck or had been not received by the feature expanded at neck in hole
Back wave then judges that the location of defect is located at 2 top of sensor in hole.
7) according to the judging result of step 6), if 2 present position of sensor is the location of necking down defect in hole,
It can determine the location of defect according to scale shown in current sensor lead 7.If but in hole sensor 2 not in necking down
The location of defect, i.e. latter two b, c situation then need to open after air-stopping valve 10 makes the fixed device 4 of air bag lose heart, will be in hole
Sensor 2 is moved a certain distance towards the location of defect, specific moving distance can according to the preceding incidence wave once detected,
The signal of back wave is substantially estimated.Then step 2)~6 are repeated again), until meeting situation described in a, that is, can determine
The location of necking down defect.
Certainly, it for there are the cast-in-place concrete piles 6 of necking down defect, is received based on sensor 2 in stake top sensor 1 and hole
To incidence involve back wave vibration amplitude, the severity of defect can also be further judged according to one-dimensional wave theory, than
Such as necking down degree.
In addition, can be compared based on obtained result is repeatedly measured when measurement concrete velocity of wave, stake are long, or
It is averaged, to reduce error to the greatest extent.When treating peg is longer, traditional low strain integrity testing method cannot measure pile bottom reflection, pass through this
Sensor 2 in hole can be placed into place as deep as possible in stake by the method for invention, then tapped stake top again and carried out accordingly
Detection.
Above-mentioned embodiment is only a preferred solution of the present invention, so it is not intended to limiting the invention.Have
The those of ordinary skill for closing technical field can also make various changes without departing from the spirit and scope of the present invention
Change and modification.Therefore all mode technical solutions obtained for taking equivalent substitution or equivalent transformation, all fall within guarantor of the invention
It protects in range.
Claims (10)
1. a kind of stake top of foundation pile, Kong Zhongshuan measuring point low strain integrity test device, it is characterised in that: including stake top sensor
(1), sensor (2), built-in pipe (3), air bag fixed device (4), gas tube (9), air-stopping valve (10), air charging system in hole
(11)；Built-in pipe described at least one (3) is vertically embedded in the steel reinforcement cage of cast-in-place concrete pile (6)；The stake top passes
Sensor (1) He Kongzhong sensor (2) is acceleration transducer, and stake top sensor (1) is fixed on the stake of cast-in-place concrete pile (6)
It pushes up, sensor (2) is located in built-in pipe (3) in hole, and sensor (2) is equipped with the fixed dress of the air bag for being fixed temporarily in hole
It sets (4), the air bag fixed device (4) is the closed air bag with inflating port, and air pocket rings are sensed around being wrapped in hole
Device (2) is external, and inflating port is placed in the air charging system (11) outside foundation pile by gas tube (9) connection, and sets on gas tube (9)
There are air-stopping valve (10)；Stake top sensor (1) the He Kongzhong sensor (2) is external by sensor lead (7) connection respectively
Data acquisition processing device (8).
2. the stake top of foundation pile as described in claim 1, Kong Zhongshuan measuring point low strain integrity test device, it is characterised in that:
Sensor (2) lower surface is hung with clump weight (5) in the hole.
3. the stake top of foundation pile as described in claim 1, Kong Zhongshuan measuring point low strain integrity test device, it is characterised in that:
The built-in pipe (3) has a plurality of, is distributed in the different location of cast-in-place concrete pile (6) cross section.
4. the stake top of foundation pile as described in claim 1, Kong Zhongshuan measuring point low strain integrity test device, it is characterised in that:
Described built-in pipe (3) internal diameter need to be greater than the maximum outside diameter of sensor (2) in hole, but be less than sensor (2) and discouraged shape in hole
The sum of the maximum outside diameter of state lower gasbag fixed device (4).
5. the stake top of foundation pile as described in claim 1, Kong Zhongshuan measuring point low strain integrity test device, it is characterised in that:
The sensor lead (7) is equipped with scale.
6. the stake top of foundation pile as described in claim 1, Kong Zhongshuan measuring point low strain integrity test device, it is characterised in that:
It further include the pulse hammer tapped for the stake top to cast-in-place concrete pile (6).
7. the stake top of foundation pile as described in claim 1, Kong Zhongshuan measuring point low strain integrity test device, it is characterised in that:
The data acquisition processing device (8) is dynamic tester device.
8. the stake top of foundation pile as described in claim 1, Kong Zhongshuan measuring point low strain integrity test device, it is characterised in that:
The air charging system (11) is inflator or inflator pump, keeps being completely closed between gas tube (9) and the inflating port of air bag.
9. a kind of utilize the stake top of detection device, Kong Zhongshuan measuring point low strain integrity test as described in claim 1~8 is any
Method, for detecting, the concrete velocity of wave of foundation pile, stake be long and pile body integrity, which is characterized in that steps are as follows:
1) stake top sensor (1) is fixed on to the stake top position of cast-in-place concrete pile (6), recycles sensor lead (7) by hole
Middle sensor (2) hangs onto built-in pipe (3), and the difference in height of stake top sensor (1) He Kongzhong sensor (2) is z；Utilize inflation
Device (11) is inflated air bag fixed device (4), expands air bag and is pressed in built-in pipe (3) inner wall, is then shut off only
Air valve (10) is fixed on sensor in hole (2) on the tube wall of built-in pipe (3)；
2) it is tapped using stake top of the pulse hammer to cast-in-place concrete pile (6), passes through data acquisition processing device (8) collecting pile
Push up the response data of sensor (1) He Kongzhong sensor (2)；
3) the vibratory response time difference Δ t that stake top sensor (1) He Kongzhong sensor (2) tap this is calculated0, it is mixed to obtain this
Concrete velocity of wave is in solidifying soil bored concrete pile (6)
4) the time difference Δ t that the incidence that sensor (2) receives after this percussion in hole involves reflection wave at the bottom of pile is calculated1, obtain
Stake overall length be
5) the complete of pile body is judged according to this stake top sensor (1) He Kongzhong sensor (2) character of reflection wave for tapping acquisition
Property: if stake top sensor (1) He Kongzhong sensor (2) receives only reflection wave at the bottom of pile, judge to be not present in current foundation pile
Defect, pile body are complete；If sensor (2) also receives pile body in addition to receiving reflection wave at the bottom of pile in stake top sensor (1) or hole
When the feature back wave of defect, judge that existing defects in current foundation pile, pile body are imperfect；
6) for there are the cast-in-place concrete pile of necking down defect (6), according to the character of reflection wave of sensor in hole (2), further
Judge the location of necking down defect:
If sensor (2) receives only the feature back wave for expanding the feature back wave at neck without receiving bottleneck in hole,
Then judge that sensor (2) present position is the location of defect in current hole；
If sensor (2) can receive bottleneck and expand the feature back wave at neck in hole, the location of defect is judged
In hole below sensor (2)；
If sensor (2) had both been not received by the feature back wave of bottleneck or had been not received by the feature reflection expanded at neck in hole
Wave then judges that the location of defect is located in hole above sensor (2)；
7) according to the judging result of step 6), if sensor (2) opens air-stopping valve (10) not in the location of defect in hole
It is after so that air bag fixed device (4) is lost heart, sensor in hole (2) is mobile towards the location of defect, step is then repeated again
2)~6), until determining the location of defect.
10. the stake top of detection device as claimed in claim 9, Kong Zhongshuan measuring point low strain integrity testing method, which is characterized in that right
In the incidence there are the cast-in-place concrete pile of necking down defect (6), received based on stake top sensor (1) He Kongzhong sensor (2)
Involve back wave vibration amplitude, the severity of defect is further judged according to one-dimensional wave theory.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910400467.8A CN110173006A (en) | 2019-05-15 | 2019-05-15 | The stake top of foundation pile, Kong Zhongshuan measuring point low strain integrity test device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910400467.8A CN110173006A (en) | 2019-05-15 | 2019-05-15 | The stake top of foundation pile, Kong Zhongshuan measuring point low strain integrity test device and method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110173006A true CN110173006A (en) | 2019-08-27 |
Family
ID=67691427
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910400467.8A Pending CN110173006A (en) | 2019-05-15 | 2019-05-15 | The stake top of foundation pile, Kong Zhongshuan measuring point low strain integrity test device and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110173006A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110924454A (en) * | 2019-11-25 | 2020-03-27 | 安徽省七星工程测试有限公司 | Multi-measuring-point low-strain detection method for integrity of foundation pile |
| CN111894050A (en) * | 2020-07-30 | 2020-11-06 | 广东省地质工程公司 | Novel sounding pipe and construction method thereof |
| CN111997106A (en) * | 2020-08-21 | 2020-11-27 | 湖北中南岩土工程有限公司 | Cone-probe grouting quality rapid detection method |
| CN112900506A (en) * | 2021-01-21 | 2021-06-04 | 饶远时 | Pile foundation quality detection device and use method |
| CN114839205A (en) * | 2022-05-11 | 2022-08-02 | 中国矿业大学 | Umbrella-shaped opening-closing sectional type low-strain integrity testing device and method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0961202A (en) * | 1995-08-23 | 1997-03-07 | Toshiba Corp | Fixing device for measuring sensor |
| JP2007170028A (en) * | 2005-12-21 | 2007-07-05 | Takenaka Komuten Co Ltd | Pile testing method and sensor press-fitting device |
| CN205475366U (en) * | 2016-01-21 | 2016-08-17 | 昆山市交通工程试验检测中心有限公司 | Foundation pile hangs down strain detection device |
| CN210194704U (en) * | 2019-05-15 | 2020-03-27 | 浙江大学 | Double-measuring-point low-strain integrity detection device for pile top and hole of foundation pile |
-
2019
- 2019-05-15 CN CN201910400467.8A patent/CN110173006A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0961202A (en) * | 1995-08-23 | 1997-03-07 | Toshiba Corp | Fixing device for measuring sensor |
| JP2007170028A (en) * | 2005-12-21 | 2007-07-05 | Takenaka Komuten Co Ltd | Pile testing method and sensor press-fitting device |
| CN205475366U (en) * | 2016-01-21 | 2016-08-17 | 昆山市交通工程试验检测中心有限公司 | Foundation pile hangs down strain detection device |
| CN210194704U (en) * | 2019-05-15 | 2020-03-27 | 浙江大学 | Double-measuring-point low-strain integrity detection device for pile top and hole of foundation pile |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110924454A (en) * | 2019-11-25 | 2020-03-27 | 安徽省七星工程测试有限公司 | Multi-measuring-point low-strain detection method for integrity of foundation pile |
| CN111894050A (en) * | 2020-07-30 | 2020-11-06 | 广东省地质工程公司 | Novel sounding pipe and construction method thereof |
| CN111997106A (en) * | 2020-08-21 | 2020-11-27 | 湖北中南岩土工程有限公司 | Cone-probe grouting quality rapid detection method |
| CN111997106B (en) * | 2020-08-21 | 2022-02-22 | 湖北中南岩土工程有限公司 | Cone-probe grouting quality rapid detection method |
| CN112900506A (en) * | 2021-01-21 | 2021-06-04 | 饶远时 | Pile foundation quality detection device and use method |
| CN114839205A (en) * | 2022-05-11 | 2022-08-02 | 中国矿业大学 | Umbrella-shaped opening-closing sectional type low-strain integrity testing device and method |
| CN114839205B (en) * | 2022-05-11 | 2024-01-23 | 中国矿业大学 | Umbrella-shaped opening and closing sectional type low-strain integrity testing device and method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110173006A (en) | The stake top of foundation pile, Kong Zhongshuan measuring point low strain integrity test device and method | |
| CN110173005A (en) | The Kong Zhongshuan measuring point low strain integrity test device and method of foundation pile | |
| JP6463871B2 (en) | Borehole test equipment | |
| CN105735374B (en) | A kind of method of the bearing capacity of Large strain method test pile | |
| CN106770643B (en) | Method for detecting pile bottom grouting effect of expanded-bottom cast-in-place pile based on sound wave propagation principle | |
| CN210238470U (en) | Sliding type inclination measuring device with settlement observation function | |
| CN104713950B (en) | Sonic test coupling device and method of testing | |
| CN107505650A (en) | The Security Evaluation System and method of dike among closely-spaced tunnel | |
| CN106869909B (en) | Testing device and testing method for determining hydrogeological parameters of inclined filling fracture | |
| CN205475366U (en) | Foundation pile hangs down strain detection device | |
| CN210194704U (en) | Double-measuring-point low-strain integrity detection device for pile top and hole of foundation pile | |
| CN210194703U (en) | Low strain integrality detection device of two survey points in hole of foundation pile | |
| CN107119729A (en) | A kind of low strain dynamic coordinates the method that ultrasonic wave carries out foundation pile integrity detection | |
| CN106767583A (en) | For the longitudinal profile Equivalent Pile footpath computational methods of pile detection sound wave transmission method | |
| CN106770668A (en) | A kind of pile quality sound wave transmission method detection method for single hole | |
| KR102570024B1 (en) | Paper drain board installing equipment with mandrel pressure measuring system using load cell | |
| CN104776818A (en) | Ultrasonic measurement instrument for pile bottom sediment thickness | |
| CN106948809A (en) | Inclination angle type opening size test devices and methods therefor | |
| CN214503289U (en) | Water pressure test device | |
| CN216041382U (en) | Bored concrete pile sediment testing arrangement | |
| CN110886329A (en) | Device for detecting perpendicularity of pile foundation and application method thereof | |
| CN108240003B (en) | Foundation pile detection method for existing building | |
| CN107142822B (en) | A kind of roadbed cavity detection device and its detection method | |
| CN105672381B (en) | A kind of ultrasonic wave pile bottom sediment thickness detection apparatus and detection method | |
| CN204439038U (en) | A kind of ultrasound wave pile bottom sediment thickness measurement equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |