CN202273254U - Quality detection device for cement soil mixed piles - Google Patents
Quality detection device for cement soil mixed piles Download PDFInfo
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- CN202273254U CN202273254U CN201120387103XU CN201120387103U CN202273254U CN 202273254 U CN202273254 U CN 202273254U CN 201120387103X U CN201120387103X U CN 201120387103XU CN 201120387103 U CN201120387103 U CN 201120387103U CN 202273254 U CN202273254 U CN 202273254U
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- seismic detector
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- 239000004568 cement Substances 0.000 title abstract description 25
- 238000001514 detection method Methods 0.000 title abstract description 20
- 239000002689 soil Substances 0.000 title abstract description 17
- 238000003756 stirring Methods 0.000 claims description 13
- 238000000034 method Methods 0.000 abstract description 27
- 238000010276 construction Methods 0.000 abstract description 9
- 230000007547 defect Effects 0.000 abstract description 4
- 230000005284 excitation Effects 0.000 abstract description 4
- 238000004458 analytical method Methods 0.000 abstract description 3
- 238000002156 mixing Methods 0.000 description 17
- 238000012360 testing method Methods 0.000 description 9
- 238000013019 agitation Methods 0.000 description 4
- 230000002950 deficient Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000007596 consolidation process Methods 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
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- 229940098458 powder spray Drugs 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 208000035126 Facies Diseases 0.000 description 1
- 208000002193 Pain Diseases 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
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- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000012669 compression test Methods 0.000 description 1
- 238000010205 computational analysis Methods 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000009659 non-destructive testing Methods 0.000 description 1
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- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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Abstract
The utility model discloses a quality detection device for cement soil mixed piles. The device comprises excitation equipment, a seismograph, a plurality of sensors and a computer, wherein a trigger switch is arranged on the excitation equipment and connected with the seismograph; the sensors are respectively connected with the seismograph; and the computer is connected with the seismograph. Through the adoption of the sensors with different master frequencies, the device can carry out multi-band multi-channel detection for the cement soil mixed piles of different ages, overcomes the defect that pile bottom reflected signals cannot be obtained by using a small-strain method, causes no damage on pile shafts, and can fix the actual lengths of the piles and judge whether a project quality problem caused by cutting corners or other anthropic factors of a construction group exists or not through the analysis on detection results; the sensors are low in price, can be used repeatedly and are not liable damage; the device is simple, convenient and portable and has a small size and light weight; and the seismograph is usually provided with dozens of channels, so as to meet the multi-channel detection requirements.
Description
Technical field
The utility model relates to a kind of checkout gear of cement mixing method, in particular a kind of cement-earth stirring pile quality checkout gear.
Background technology
In recent years, when soft foundations such as processing mud, mucky soil, silt, silty clay, often adopted cement mixing method to carry out consolidation process.Cement mixing method fully mixes " cement earth pile " on the spot with cement and little additive with foundation soil body, have low price, and it is convenient to construct, advantages such as environmentally safe.But it is higher to construction process requirement, in the work progress, cement and soil mix the difficult control of grey ratio and mix uniformity coefficient, grasp the quality defects of not taking pains.It is common that to have cement to mix stirring with soil inhomogeneous and cause the few or cement-free of local cement amount.Because cement-soil stirring pile construction belongs to disguised construction, is difficult for monitoring, indivedual units in charge of construction use inferior materials and turn out substandard goods, and cause stake long not enough; Simultaneously, because consolidation rate is slower, the top construction overexerts when cutting pile crown, is prone to make problems such as superficial part pile body breaking.This construction quality influence to cement mixing pile is very big, can bring quality problems and potential safety hazard to engineering when serious.
At present in the engineering detection of cement mixing method main according to " building lot treatment technology standard " (JGJ79-90), " soft foundation deep-mixed pile reinforcing technique standard " rules such as (YBJ225-91), main detection method has:
1, digs an inspection technique
Sample frequency by stake sum 2% is dug the moulding situation that stake is checked in stake, and it is more accurate that this method detects the following 2-3m pile quality of ground surface, and its cost was too high when the degree of depth was big; Then can't detect for deep-mixed pile its underpart.
2, portable penetrometer appearance feeler inspection method
Portable penetrometer need carry out in early days, and can not surpass 5-7d the general length of time, and this detection method equipment is simple, and operation is prone to row, and empirical strong, test quantity is unrestricted.But, receiving strict restriction detection time, detection time, early state of cure was low, can not reflect truly that cement mixing method mixes actual conditions such as grey ratio and mix uniformity coefficient, detected lately, and the cement-soil state of cure is too high, and sensor can't insert and detect.Be that the static sounding sensor offset causes hole deviation on the other hand, sensor is prone to deflect away from outside the stake, detects deviation to occur, is prone to cause the long mistake that does not reach design length or " broken pile " of stake to differentiate.Simultaneously, it is more shallow to detect the degree of depth, can't accurately judge deep strength of the mixing pile and integrality.
3, bore extracting core process
Adopt the engineering exploration rig that powder spray piling is carried out omnidistance boring and coring (general the length of time 28d); This be dust at present quality of pile detect in method commonly used; Measure the total quality that the result can reflect powder spray piling preferably, the boring and coring test can intuitively be differentiated the consistency state of cement-soil, the uniformity coefficient of stirring and the situation of mixing of cement qualitatively from on-the-spot core.Simultaneously, the boring and coring compression test combines on-the-spot SPT test, is a kind of good method that reflects pile quality, and can evaluates the integrality of cement mixing method pile body through on-the-spot core.But drill hole sampling is had relatively high expectations, when occur stirring problem such as inhomogeneous in the part, be difficult to get core, cause that to get core imperfect.On the other hand, core sample receives the influence of each link disturbances such as its dimensional effect, transportation, sample preparation, makes the discreteness of its data bigger, and is representative poor.And this method detects the problem that life period is long, expense is too high.
4, static loading test method
Size according to pile capacity is confirmed pile quality qualitatively, and this method can judge directly whether the bearing capacity of single pile or composite foundation and distortion meet the demands.When both all reach designing requirement, generally can think to need not ground processing achieving success pile quality and integrality are done too much to analyze.Shortcoming is that testing equipment is heavy, lasts longlyer, and expense is high, and test quantity is less relatively, can not large tracts of land detect.
5, back wave detection method
Utilize the propagation law of elastic wave to analyze pile body integrity, this method detection speed is fast, and test is simple, and this method can judge directly whether the bearing capacity of single pile or composite foundation and distortion meet the demands.If but the wave detector dominant frequency that adopts when detecting is high, then can not obtain effective pile bottom reflection signal, maybe can only obtain the pile defect reflected signal, though and adopt the low frequency wave detector can obtain pile bottom reflection, precision is too low again.So when detecting in different places, choosing very of wave detector bothers.And one-time detection is only arranged 1 wave detector (single channel) at pile crown, owing to stir the inhomogeneities of pile body, a common position Detection result can not truly reflect pile quality, if with single channel the pile body diverse location is detected then will repeatedly excite.
Because the Strength Changes of cement-soil is big in the different soil; In the same soil layer with the variation of the degree of depth; The intensity of cement-soil also changes (as in connecting speed Lianyun Harbour, Lingao section littoral facies soft foundation, adopting agitation pile to reinforce; The long 15m of stake, the result of loosing core finds that top 7-8m degree of depth soil cement intensity can reach 1-10MPa, and the bottom cement-soil is firmly-plastic state); The ripple of different frequency is propagated in different medium and attenuation characteristic changes greatly, causes in the detection signal defective and the stake end being difficult to distinguish (particularly when stirring is inhomogeneous).
From present achievement in research, there is the detection method imperfection in cement mixing method technology for detection technology, expense is high, speed is slow, poor accuracy and detect the characteristics of the limited amount system of stake, and pile body is had damage.Particularly pile body integrity check specific aim is relatively poor, therefore applies receiving than limitations.For this reason, press on the engineering and a kind ofly can carry out checkout gear fast and effectively this cement mixing method pile quality.
The utility model content
The utility model purpose: the purpose of the utility model is to overcome the deficiency of prior art, and a kind of cement-earth stirring pile quality checkout gear is provided, and utilizes the multichannel seismic detector to accept a plurality of vibration signals simultaneously, thereby pile quality is made judgement.
Technical scheme: the utility model realizes that through following technical scheme the utility model comprises excitational equipment, seismic detector, a plurality of sensor and computer; Wherein: excitational equipment is provided with trigger switch, and trigger switch links to each other with seismic detector, and a plurality of sensors link to each other with seismic detector respectively, and computer links to each other with seismic detector.
Said excitational equipment is a hand hammer, adopts hand hammer simple to operate, and an exciting is that different passage capable of using is accepted reflection wave signal simultaneously.
Said seismic detector is the multichannel seismic detector, and the multichannel seismic detector can connect a plurality of sensors, guarantees that measurement result is accurate.
The dominant frequency of said a plurality of sensors is different, can carry out multiband, multi-channel detection to the cement mixing method in the different length of times, thereby obtains effect pile bottom reflection preferably.
Beneficial effect: the utility model is compared prior art and had the following advantages: the utility model adopts the sensor of different dominant frequency to carry out multiband, multi-channel detection to the cement mixing method in the different length of times; Overcome the defective that small Strain method in the past can't obtain the pile bottom reflection signal; To the pile body not damaged; Can confirm the physical length of stake through test result analysis, judge whether construction party exists the qualitative problems of construction of human factor such as using inferior materials and turning out substandard goods and causing; Judge the pile defect position judging whether pile body exists the stirring non-uniform phenomenon through signal analysis, and can analyze the variation of pile quality on the degree of depth, can also understand the pile strength characteristic simultaneously; The sensor price is low, reusable not fragile; Simple equipments, little, the light weight of volume, easy to carry, tens passages are arranged on the seismic detector usually, can satisfy the detection requirement of a plurality of passages.
Description of drawings
Fig. 1 is the structural representation of the utility model.
The specific embodiment
Embodiment in the face of the utility model elaborates down; Present embodiment is being to implement under the prerequisite with the utility model technical scheme; Provided detailed embodiment and concrete operating process, but the protection domain of the utility model is not limited to following embodiment.
As shown in Figure 1, present embodiment comprises excitational equipment, seismic detector 3, four sensors and computers 4; Wherein: excitational equipment is provided with trigger switch 5, and trigger switch 5 links to each other with seismic detector 3, and four sensors link to each other with seismic detector 3 respectively, and computer 4 links to each other with seismic detector 3, and four sensors are arranged on the pile crown of agitation pile 1.
Excitational equipment is a hand hammer 2, manually knocks the iron plate that places the stake top.The velocity of wave of cement mixing pile own is lower; Ripple is fast along the pile body decay; What need is low-frequency component; So the sensor in the present embodiment all adopts velocity sensor, it is better to detect effect, but can adopt the high acceleration transducer effect of dominant frequency preferable to the stake that the pile time is long, cement mixed weight is high, velocity of wave is big.
Generally necessarily mixing when amount ash according to cement-soil, the velocity of wave in the different length of times, as the length of time velocity of wave 7～60 days the time between 600～1500m/s, change.Select the sensor of basic frequency 20～100Hz, in the time obtaining effective pile bottom reflection, the corresponding basic frequency of selected sensor is best results and detects frequency.
Present embodiment seismic detector 3 is selected RAS-24 shallow-layer multichannel seismic detector for use, and this seismic detector has following characteristics: (1) 24 A/D conversion; (2) wide dynamic range; (3) light-10LBS; (4) easy-to-assemble-connection 10 acquisition stations (240 road); (5) three-dimensional of no more than 10 lines; (6) accomplish test automatically; (7) computer interface operation; (8) WINDOWS operating system; (9) arrange cable with 12 roads of standard.
During present embodiment work:
(1) pile crown of agitation pile 1 is handled: because the top compacting is not enough during pile, more open usually, coarse, the irregular pile crown of agitation pile 1 pile crown should cut, and smooth, cleaning;
(2) sensor is laid: first sensor 6, second sensor 7, the 3rd sensor 8 and four-sensor 9 are placed in the pile crown of handling well; Symmetry, be placed on the position in stake core 2/3 footpath uniformly; Lay and a little should avoid loose place, the proof stress ripple quality of reception;
(3) vibration source is selected: selects suitable vibration source, make the excitation excitation pulse have best re-pointing property and penetration capacity, present embodiment adopts 18 ft lbfs to hammer into shape to knock to place the pile crown center as focus;
(4) trigger switch 5 is fixed on the power hammer; Produce seismic wave through manually knocking pile crown; Simultaneously the signal of telecommunication of trigger switch 5 reaches seismic detector 3 through cable, and seismic detector 3 picks up and write down the cement mixing method 1 medium wave impedance variation position that four sensor acquisition arrive, the reflection wave signal at the bottom of obtaining like defective etc.; Signal passes to seismic detector 3 through cable, and seismic detector 3 passes to the signal of record on the computer 4 through cable.
(5) obtain wavy curve figure through computer 4 computational analysiss, analyze defective, the stake end position result of cement mixing method 1 body that obtains testing, reach the nondestructive testing purpose through handling.
Claims (3)
1. a cement-earth stirring pile quality checkout gear is characterized in that, comprises excitational equipment, seismic detector (3), a plurality of sensor and computer (4); Wherein: excitational equipment is provided with trigger switch (5), and trigger switch links to each other with seismic detector (3), and a plurality of sensors link to each other with seismic detector (3) respectively, and computer (4) links to each other with seismic detector (3).
2. cement-earth stirring pile quality checkout gear according to claim 1 is characterized in that: said excitational equipment is a hand hammer.
3. cement-earth stirring pile quality checkout gear according to claim 1 is characterized in that: said seismic detector (3) is the multichannel seismic detector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120387103XU CN202273254U (en) | 2011-10-12 | 2011-10-12 | Quality detection device for cement soil mixed piles |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120387103XU CN202273254U (en) | 2011-10-12 | 2011-10-12 | Quality detection device for cement soil mixed piles |
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| Publication Number | Publication Date |
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| CN202273254U true CN202273254U (en) | 2012-06-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201120387103XU Expired - Fee Related CN202273254U (en) | 2011-10-12 | 2011-10-12 | Quality detection device for cement soil mixed piles |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102866417A (en) * | 2012-10-22 | 2013-01-09 | 南京大学 | Device and method for seismic cross hole computed tomography (CT) detection and tomography of underground cave |
| CN106013266A (en) * | 2016-06-12 | 2016-10-12 | 中冶集团武汉勘察研究院有限公司 | Detecting method of vertical bearing capacity characteristic values of single piles associated with ages of cement-mixing piles |
| CN107642114A (en) * | 2017-11-09 | 2018-01-30 | 中南大学 | Stake bottom hidden danger method for surveying and its prospecting apparatus before pile foundation cast |
| CN109060958A (en) * | 2018-09-11 | 2018-12-21 | 安徽宏泰交通工程设计研究院有限公司 | Intelligent dynamic testing of pile instrument |
-
2011
- 2011-10-12 CN CN201120387103XU patent/CN202273254U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102866417A (en) * | 2012-10-22 | 2013-01-09 | 南京大学 | Device and method for seismic cross hole computed tomography (CT) detection and tomography of underground cave |
| CN106013266A (en) * | 2016-06-12 | 2016-10-12 | 中冶集团武汉勘察研究院有限公司 | Detecting method of vertical bearing capacity characteristic values of single piles associated with ages of cement-mixing piles |
| CN106013266B (en) * | 2016-06-12 | 2017-10-31 | 中冶集团武汉勘察研究院有限公司 | A kind of vertical bearing capacity of single pile feature value detection method related to cement mixing method age |
| CN107642114A (en) * | 2017-11-09 | 2018-01-30 | 中南大学 | Stake bottom hidden danger method for surveying and its prospecting apparatus before pile foundation cast |
| CN107642114B (en) * | 2017-11-09 | 2023-08-15 | 中南大学 | Pile foundation hidden danger exploration method and device before pile foundation pouring |
| CN109060958A (en) * | 2018-09-11 | 2018-12-21 | 安徽宏泰交通工程设计研究院有限公司 | Intelligent dynamic testing of pile instrument |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120613 Termination date: 20151012 |
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| EXPY | Termination of patent right or utility model |