CN107326943A - A kind of method that low strain dynamic for realizing pile foundation gathers signal conformance - Google Patents
A kind of method that low strain dynamic for realizing pile foundation gathers signal conformance Download PDFInfo
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- CN107326943A CN107326943A CN201710691206.7A CN201710691206A CN107326943A CN 107326943 A CN107326943 A CN 107326943A CN 201710691206 A CN201710691206 A CN 201710691206A CN 107326943 A CN107326943 A CN 107326943A
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- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000012360 testing method Methods 0.000 claims abstract description 57
- 230000003116 impacting effect Effects 0.000 claims abstract description 37
- 238000001514 detection method Methods 0.000 claims abstract description 24
- 239000007787 solid Substances 0.000 claims abstract description 12
- 238000009434 installation Methods 0.000 claims abstract description 11
- 239000000463 material Substances 0.000 claims abstract description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 239000004677 Nylon Substances 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 229920006351 engineering plastic Polymers 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 229920001778 nylon Polymers 0.000 claims description 3
- 238000012216 screening Methods 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 230000007547 defect Effects 0.000 description 10
- 239000010438 granite Substances 0.000 description 9
- 238000004458 analytical method Methods 0.000 description 6
- 238000005259 measurement Methods 0.000 description 5
- 239000004576 sand Substances 0.000 description 4
- 239000002689 soil Substances 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000004927 clay Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000002950 deficient Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 238000011016 integrity testing Methods 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 238000012552 review Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000007405 data analysis Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000010412 perfusion Effects 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 238000009394 selective breeding Methods 0.000 description 1
- 230000001052 transient effect Effects 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
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- 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)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
A kind of method that low strain dynamic for realizing pile foundation gathers signal conformance, firstly, for solid pile and hollow pile, has respectively provided the installation site of impacting point and test point；Secondly, the exciting force of selection suitable material hammers vertical exciting into shape in stake top face, and height of the fall is divided into low hammer and height drops hammer, to ensure that a bottom signal is effectively excited；Every group of detection useful signal of collection includes low hammer detection signal and height drops hammer detection signal, and gives signal screening method.Using the method for the present invention so that same pile base, the being consistent property of signal curve of different people's collections, testing result is accurate, beneficial to reviewing.
Description
Technical field
The present invention relates to pile measurement field, particularly a kind of low strain dynamic for realizing pile foundation gathers the side of signal conformance
Method.
Background technology
Low strain integrity testing specification is installed and exciting operation, signal acquisition and sieve to the measurement sensor of low strain dynamic Site Detection
The operation such as choosing has carried out a series of regulation, but neither one standard operation method is to ensure the consistent of low strain dynamic collection signal
Property, cause the pile body integrity result of determination of low strain integrity testing signal different, problem mainly shows as follows：
1st, same detection stake, the signal curve of different people's collections may be inconsistent；
2nd, the signal curve of same person different time collection is also possible to inconsistent；
3rd, sensor is installed and impacting point position is more random, and reproducibility is poor, it is impossible to review；
4th, height of the fall disunity during exciting, causes the signal wave of collection variant, and during data analysis, for one
Root signal wave profile, it is unclear that the collection dynamics of signal, is unfavorable for further tracing analysis and statistics；
5th, there is also larger randomness for signal screening.
The content of the invention
It is a primary object of the present invention to overcome drawbacks described above of the prior art, propose that one kind ensures to gather signal curve
Uniformity, testing result is accurate, method that is gathering signal conformance beneficial to the low strain dynamic for realizing pile foundation reviewed.
The present invention is adopted the following technical scheme that：
A kind of method that low strain dynamic for realizing pile foundation gathers signal conformance, it is characterised in that：Firstly, for solid pile and
Hollow pile, respectively provides impacting point and test point installation site；Secondly, the exciting force of selection suitable material is hammered into shape and uses vertical sharp
Shake in stake top face, height of the fall is divided into low hammer and height drops hammer；Every group of detection useful signal of collection includes low hammer detection
Signal and height drop hammer detection signal.
It is preferred that, for solid pile, its mounting means is as follows：Impacting point is installed on pile center, and some test points are with exciting
Make circle distribution centered on point.
It is preferred that, distance is the 2/3 of pile body radius or the length of side between the test point and the impacting point.
It is preferred that, include four test points, be respectively arranged in due north, due east, due south and the due west direction in a face, and
One test point is direct north.
It is preferred that, for hollow pile, its mounting means is as follows:Some impacting points and some test points are around stake face center circle
Week is uniformly interspersed.
It is preferred that, the position of some impacting points and some test points is at the 1/2 of the pile wall thickness.
It is preferred that, the angle that the adjacent impacting point and test point are constituted with the stake face line of centres is 60 °, and wherein the
One test point is direct north.
It is preferred that, the exciting force hammer uses the tup of engineering plastics, nylon, iron or copper material.
It is preferred that, the low height of the fall of the exciting force hammer is 5-15cm, high height of the fall >=20cm.
It is preferred that, when collection detection useful signal two signal curves it is inconsistent when and with other groups of signal curves
When inconsistent, this group of invalidating signal re-starts collection.
From the above-mentioned description of this invention, compared with prior art, the present invention has the advantages that：
1st, the inventive method specifies corresponding impacting point and test point installation site for solid pile and hollow pile, and really
Determine exciting force hammer material, height of the fall and mode etc. so that same pile base, the signal curve of different people's collections can keep one
Cause property.
2nd, signal curve also the being consistent property of same person different time collection.
3rd, sensor is installed and impacting point position Uniform provisions, and reproducibility is good, and is beneficial to review.
4th, exciting height of the fall is defined, is conducive to tracing analysis and compares.
5th, method of the invention, inspection that its every group of detection useful signal gathered includes low hammer detection signal and height drops hammer
Signal is surveyed, to ensure that a bottom signal is effectively excited；And provide the method for selection of signal curve so that and screening more specification, keep away
Exempt from testing result caused by there is artificial selection inconsistent.
Brief description of the drawings
Fig. 1 is the impacting point of circular hollow pile of the present invention and the schematic view of the mounting position of sensor test point.
Fig. 2 is the impacting point of square hollow pile of the present invention and the schematic view of the mounting position of sensor test point.
Fig. 3 is the impacting point of circular solids of the present invention stake and the schematic view of the mounting position of sensor test point.
Fig. 4 is the impacting point of square solid pile of the present invention and the schematic view of the mounting position of sensor test point.
Fig. 5 is the signal curve figure that applicating example 1 is gathered.
Fig. 6 is the signal curve figure that applicating example 2 is gathered.
Embodiment
Below by way of embodiment, the invention will be further described.
A kind of method that low strain dynamic for realizing pile foundation gathers signal conformance, firstly, for solid pile and hollow pile, is used
Different impacting points and test point mounting means；Secondly, the exciting force of selection suitable material is hammered into shape and uses vertical exciting in stake top
Face, height of the fall is divided into low hammer and height drops hammer, to ensure that a bottom signal is effectively excited；Every group of detection useful signal of collection
Include low hammer detection signal and height drops hammer detection signal, and give signal screening method, when defective, trade-off curve
Upper defect shows the low strain dynamic representation signal curve of clear signal this most the most.When the defect characteristic of signal curve may be sentenced
When being set to II class or III class or IV class, severe judgement is carried out by least favorable principle under the premise of signal acquisition is normal.II class or III class
Or IV class with reference to defined pile integrity detection standard.Specifically include following steps：
The first step, Stake head handling：Laitance is chiseled out, the installation site of holding sensor and the stake face position of impacting point 10 all should
It is smooth closely knit, during out-of-flatness, it should be polished before detection.
Second step, from instrument and equipment：Before engineering test, from the instrument for meeting demand of technical standard, somascope
Device performance state, it is ensured that instrument host electricity is sufficient, working properly, main frame and sensor group into whole test system configurations close
It is suitable, to ensure that test signal is true and reliable.
3rd step, instrument is set：Sensor and main frame are connected, reasonable instrument parameter is set.And note the preventing and treating disturbed,
Interference ripple including the high Electromagnetic Fields of 50Hz and other random vibrations nearby.
The test point 20 of 4th step, impacting point 10 and sensor is installed：
To avoid the hand steered interference to sensor signal, sensor is bonded using couplant；Sensor is installed should be with stake face
Vertically, install with " flat, steady, jail " as principle；Impacting point 10 should avoid the cage bar shadow of steel reinforcement cage with measurement sensor installation site
Ring.
1. for solid pile, impacting point 10 is arranged on Zhuan Mian centers, and the test point 20 of sensor is arranged symmetrically 4, installation
Position is at 2/3 radius away from Zhuan Mian centers, wherein it is just that first test point 20a, which is direct north, second test point 20b,
Dong Fangxiang, the 3rd test point 20c are that due south direction, the 4th test point 20d are due west direction, and the position of impacting point 10 is kept not
Become.Reference picture 1, Fig. 2.
2. for hollow pile, the installation site of the test point 20 of impacting point 10 and sensor swashs at the 1/2 of pile lining thickness
Shake a little 10 and test point 20 and the angle of stake face line of centres formation be 60 °, wherein first test point 20a be direct north,
Second test point 20b is that due north turns clockwise at 120 °, the 3rd test point 20c is that due north turns clockwise at 240 °,
First impacting point 10a be due north turn clockwise at 60 °, second impacting point 10b be due north turn clockwise at 180 °,
Three impacting point 10c are that due north turns clockwise at 300 °.Reference picture 3, Fig. 4.
5th step, hammering：
Transient excitation by live Knock test, should select the exciting force hammer and height of the fall of approrpiate wts.Power hammer is general
The tup being made of engineering plastics or nylon material, it is adaptable to long stake or the deeper stake of defect, for pile body is shorter or pile body
The identification and positioning of shallow defects, the tup that power hammer is made using iron, copper product.
Drop hammer and fallen using freely falling body perpendicular to stake face, highly using low, high two kinds, respectively gather a useful signal,
The low clearance wherein dropped hammer preferably 5-15cm, optimal is preferably 20cm or more than 20cm for 10cm, height, and hammering is clear and melodious, forms single
Disturbance.
6th step, signal acquisition：
Signal does not answer distortion and produces drift, and the range of measuring system is not to be exceeded in signal amplitude, and the collection of waveform should be protected
Stake bottom signal is demonstrate,proved by reliable recording.
1. for solid pile, the detection useful signal of collection is 4 groups, every group 2, the test point of totally 8, i.e., first 20
It is low hammer, height drop hammer it is each collection one, curve is recorded as 1-1,1-2 respectively；2nd~4 test point 20b, 20c, 20d's is low
Hammer, height drop hammer it is each collection one, curve is designated as 2-1,2-2,3-1,3-2,4-1,4-2 respectively.
2. for hollow pile, the detection useful signal of collection is 6 groups, the test point 20a and first of every group two, i.e., the 1st
Individual impacting point 10a low hammer, height drop hammer it is each collection one, curve is recorded as 1-1,1-2 respectively；2nd test point 20b and
One impacting point 10a low hammer, height drop hammer it is each collection one, curve is recorded as 2-1,2-2 respectively；Second and third test point
20b, 20c and second impacting point 10b low, high each collection one of dropping hammer, curve is designated as 3-1,3-2,4-1,4-2 respectively；The
3rd, test point 20c, a 20a and the 3rd impacting point 10c low, high each one article of collection of dropping hammer, curve is designated as 5-1,5- respectively
2、6-1、6-2。
When surveying time-domain signal uniformity difference, reason should be analyzed, can separately increase assisted acquisition curve, and note down.
7th step, signal analysis：
Signal analysis is carried out with reference to data such as geologic report, construction note, pile-type classification, construction technologies.When the letter of collection
Number there are n groups, when defective, then defect shows that signal curve the most obvious is represented as the low strain dynamic of this on trade-off curve
Signal curve；When one group of two bars curves are inconsistent, and with other several groups of signal curves it is inconsistent when, then this group of signal
Curve is invalid, should re-start collection.
Applicating example 1
(1) project profile
Xiamen Housing Project, pile foundation uses sinking duct perfusion peg base, solid pile, and pile body cross dimensions is φ 700mm,
Concrete strength of pile grade is C35, and bearing course at pile end is completely weathered granite.
General condition of engineering geology：Soil layer situation is from top to bottom plain fill, fill out gravelly sand, muck soil, coarse sand, gravelly sand, remained
Gravelly clay, completely weathered granite, gritty strong weathered granite, chunky shape strong weathered granite, middle weathered granite.
This test pile is cast-in-situ concrete poured stake, and the long 24.2m of stake, pile No. is 258#.Because hidden pipe pile is solid pile, press
The method of the present invention, the detection useful signal of collection is 4 groups, and every group of low hammer, height drop hammer each collection one, reference picture 5, curve
258-1-1,258-1-2 are recorded as respectively；258-2-1、258-2-2、258-3-1、258-3-2、258-4-1、258-4-2.
Drawn from test result analysis, time-domain signal curve pile bottom reflection is obvious, partial test Display of signal curve pile body
There are light defects, such as 258-4-1,258-4-2 curve at about 8.5m；Partial trace shows that pile body has at about 8.5m and substantially lacked
Fall into, such as 258-1-2,258-3-2 curve.Finally, selection defect shows the i.e. 258-3-2 of signal curve the most obvious as the stake
Low strain dynamic representation signal curve, pile body integrity is determined as III class.
Applicating example 2
(2) project profile
Xiamen Housing Project, pile foundation uses PHC pipe pile foundations, and pile-type is PHC500-125-AB, hollow pile, pile body
Strength grade of concrete is C80.
General condition of engineering geology：Soil layer situation is from top to bottom plain fill, silty clay, remains gravel (sand) matter cohesive soil, entirely
Weathered granite, granular media shape strong weathered granite, chunky shape strong weathered granite, middle weathered granite.
This test pile is two section stakes, and the long 18.6m of stake, pile No. is 16#.Because pile tube is hollow pile, in the present inventive method,
The detection useful signal of collection be 6 groups, every group it is low hammer, height drop hammer it is each collection one, reference picture 6, curve is recorded as 16- respectively
1-1、16-1-2、16-2-1、16-2-2、16-3-1、16-3-2、
16-4-1,16-4-2,16-5-1,16-5-2,16-6-1,16-6-2, test result are as follows：
Drawn from test result analysis, partial test Display of signal curve pile body zero defect, partial trace is shown in about
There are light defects, such as 16-2-2,16-3-1,16-3-2 curve at 8.0m.Finally, selection defect shows signal the most obvious
Curve is low strain dynamic representation signal curves of the 16-3-1 as this, and pile body integrity is determined as II class.
Other technical requirements：
A. the position of the installation site of sensor and impacting point 10 all should be smooth closely knit, is polished before preferably detecting；
B. sensor installation should be vertical with stake face, installs with " flat, steady, jail " as principle；
C. direction of excitation should be along stake axis direction；
D. to avoid the hand steered interference to sensor signal, sensor is bonded using couplant；
E. the cage bar that impacting point 10 should avoid steel reinforcement cage with measurement sensor installation site influences；
F. when actual measurement time-domain signal uniformity is poor, reason should be analyzed, can separately increase assisted acquisition curve, and note down；
G. signal does not answer distortion and produces drift, and the range of measuring system is not to be exceeded in signal amplitude.
8th step：Printing test result.
The embodiment of the present invention is above are only, but the design concept of the present invention is not limited thereto, it is all to utilize this
Conceive the change that unsubstantiality is carried out to the present invention, the behavior for invading the scope of the present invention all should be belonged to.
Claims (10)
1. a kind of method that low strain dynamic for realizing pile foundation gathers signal conformance, it is characterised in that：Firstly, for solid pile and sky
Heart stake, respectively provides impacting point and test point installation site；Secondly, the exciting force of selection suitable material is hammered into shape and uses vertical exciting
In stake top face, height of the fall is divided into low hammer and height drops hammer；Every group of detection useful signal of collection includes low hammer detection letter
Number and height drop hammer detection signal.
2. the method that the low strain dynamic as claimed in claim 1 for realizing pile foundation gathers signal conformance, it is characterised in that：For reality
Heart stake, its mounting means is as follows：Impacting point is installed on pile center, and some test points make circle distribution centered on impacting point.
3. the method that a kind of low strain dynamic for realizing pile foundation as claimed in claim 2 gathers signal conformance, it is characterised in that：Institute
It is the 2/3 of pile body radius or the length of side to state distance between test point and the impacting point.
4. the method that a kind of low strain dynamic for realizing pile foundation as claimed in claim 2 gathers signal conformance, it is characterised in that：Bag
Four test points have been included, due north, due east, due south and the due west direction in a face is respectively arranged in, and first test point is due north
Direction.
5. the method that a kind of low strain dynamic for realizing pile foundation as claimed in claim 1 gathers signal conformance, it is characterised in that：It is right
In hollow pile, its mounting means is as follows:Some impacting points and some test points are uniformly interspersed around stake face center circumferential.
6. the method that a kind of low strain dynamic for realizing pile foundation as claimed in claim 5 gathers signal conformance, it is characterised in that：Institute
The position for stating some impacting points and some test points is at the 1/2 of the pile wall thickness.
7. the method that a kind of low strain dynamic for realizing pile foundation as claimed in claim 5 gathers signal conformance, it is characterised in that：Institute
It is 60 ° to state the angle that adjacent impacting point and test point constitute with the stake face line of centres, and wherein first test point is due north
Direction.
8. the method that a kind of low strain dynamic for realizing pile foundation as claimed in claim 1 gathers signal conformance, it is characterised in that：Institute
State tup of the exciting force hammer using engineering plastics, nylon, iron or copper material.
9. the method that a kind of low strain dynamic for realizing pile foundation as claimed in claim 1 gathers signal conformance, it is characterised in that：Institute
The low height of the fall for stating exciting force hammer is 5-15cm, high height of the fall >=20cm.
10. the method that a kind of low strain dynamic for realizing pile foundation as claimed in claim 1 gathers signal conformance, it is characterised in that：
When two signal curves of the detection useful signal of collection are inconsistent and when also inconsistent with other groups of signal curves, group letter
It is number invalid, re-start collection.
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| CN109208657A (en) * | 2018-10-31 | 2019-01-15 | 湖南湘建检测有限公司 | A kind of low strain dynamic quality testing measuring tool and its test method |
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