CN106320396A - Low-strain double-speed signal averaging detection method for building solid pile - Google Patents
Low-strain double-speed signal averaging detection method for building solid pile Download PDFInfo
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- CN106320396A CN106320396A CN201610717737.4A CN201610717737A CN106320396A CN 106320396 A CN106320396 A CN 106320396A CN 201610717737 A CN201610717737 A CN 201610717737A CN 106320396 A CN106320396 A CN 106320396A
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- 239000007787 solid Substances 0.000 title claims abstract description 111
- 238000012935 Averaging Methods 0.000 title claims abstract description 57
- 238000001514 detection method Methods 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 claims abstract description 22
- 238000012360 testing method Methods 0.000 claims abstract description 22
- 230000009471 action Effects 0.000 claims abstract description 21
- 238000012545 processing Methods 0.000 claims abstract description 10
- 238000010009 beating Methods 0.000 claims description 50
- 238000011016 integrity testing Methods 0.000 claims description 15
- 230000000712 assembly Effects 0.000 claims description 11
- 238000000429 assembly Methods 0.000 claims description 11
- 229910000831 Steel Inorganic materials 0.000 claims description 10
- 230000002787 reinforcement Effects 0.000 claims description 10
- 239000010959 steel Substances 0.000 claims description 10
- 239000000523 sample Substances 0.000 claims description 8
- 230000008569 process Effects 0.000 claims description 5
- 235000014121 butter Nutrition 0.000 claims description 3
- 239000003292 glue Substances 0.000 claims description 3
- 230000001960 triggered effect Effects 0.000 claims description 2
- 238000005259 measurement Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 17
- 238000005070 sampling Methods 0.000 description 14
- 230000000694 effects Effects 0.000 description 9
- 238000010079 rubber tapping Methods 0.000 description 9
- 238000009527 percussion Methods 0.000 description 7
- 230000008859 change Effects 0.000 description 6
- 238000010008 shearing Methods 0.000 description 6
- 238000004364 calculation method Methods 0.000 description 3
- 238000004891 communication Methods 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 230000000644 propagated effect Effects 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000010365 information processing Effects 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
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- 239000000203 mixture Substances 0.000 description 1
- 230000037361 pathway Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Classifications
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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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- Engineering & Computer Science (AREA)
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- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Placing Or Removing Of Piles Or Sheet Piles, Or Accessories Thereof (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention provides a low-strain double-speed signal averaging detection method for a building solid pile. The low-strain double-speed signal averaging detection method for the building solid pile is applied to a pile body of the common building solid pile. The method comprises the steps of conducting knocking at any point on the surface of the pile top of the building solid pile; under the conditions that the concrete Poisson ratio of the pile body is already known and the concrete Poisson ratio of the pile body is not known, arranging two signal acquisition devices according to different situations correspondingly; when knocking action at the knocking point is received, obtaining measurement point signals from both signal acquisition devices at the same time, and obtaining a double-speed test curve containing all the measurement point signals; and conducting averaging processing on the double-speed curve, so that a detection result of the pile body of the building solid pile is obtained. By means of the detection method, the selection scope of the knocking point is remarkably enlarged; and by means of the obtained detection result, pile body integrity of the pile body of the building solid pile can be judged more accurately.
Description
Technical field
The present invention relates to building detection field, in particular to the low strain dynamic two-speed of a kind of building solid pile
Signal averaging detection method.
Background technology
The low change method that should detect of existing common foundation pile applies low-energy transient batting at stake top surface, taps generation
Shock wave along pile body travel downward, will produce echo, according to echo when running at the bottom of the medium side of natural impedance change or stake
Characteristics of signals judges pile quality.
At present, the low strain integrity testing detection scheme of existing solid circles foundation pile exists some problems:
All adopt firstly, for the low strain integrity testing of solid circles foundation pile, existing pile detection specification and great majority research
Tap with pile center, but, pile center is the point that stake end face is the most special, and pile center taps simply stake end face arbitrfary point
The special case tapped, say, that existing sampling plan will hit against a position and is confined to pile center.But, in Practical Project,
Pile center is the position of the conduit of casting concrete, owing to tube drawing is improper, often occurs constructional deficiency at this, the most necessary
Bias is used to tap.So, cannot ensure that center taps in a practical situation.
Secondly, when solid pile uses bias to tap, now, pile body not only taps the same creating with center and vertically passes
The compressional wave broadcast, along with the increase in stake footpath, eccentric percussion also creates significant wobbler action shearing wave, and three-dimensional interference effect
Ye Yu center is dramatically different under tapping.But, in the scheme in terms of the vertical eccentric percussion of current foundation pile low strain dynamic, and
Do not account for eccentric percussion, more do not account for how eliminating the special three-dimensional interference signal produced because bias taps and bias
Acting shear ripple.
So, it would be desirable to a kind of sampling side that can effectively eliminate interference signal in stake end face arbitrfary point when tapping
Case.
Summary of the invention
The purpose of the embodiment of the present invention is that the low strain dynamic two-speed signal averaging providing a kind of building solid pile detects
Method, to help expand the beating point range of choice of solid pile low-strain measurement and judge building solid pile pile body exactly
Integrity.
For solving problem present in existing solid pile low strain integrity testing, the technical solution used in the present invention is: Yi Zhongjian
Build the low strain dynamic two-speed signal averaging detection method of thing solid pile, the low strain dynamic two-speed signal averaging of this building solid pile
Detection method is applied to building solid circles pile body, and the method comprising the steps of:
At building solid pile stake top surface, beating point is set；
Under the conditions of known to pile concrete Poisson's ratio, at building solid pile stake top surface, with beating point place half
Footpath is at 45 ° and installs two signal pickup assemblies as solid to building at (0.67-0.5 υ) R on two radiuses of 135 °
The measuring point of stake pile body, wherein, υ is pile concrete Poisson's ratio, and R is foundation pile radius；
Under conditions of pile concrete Poisson's ratio the unknown, at building solid pile stake top surface, with beating point place half
Footpath is at 45 ° and at 2/3 of steel reinforcement cage radius on two radiuses of 135 °, two signal pickup assemblies are installed as to building in position
Build the measuring point of thing solid pile pile body；
When receiving the hammer action at beating point, obtain simultaneously from each signal pickup assembly measuring point signal and
Obtain comprising the two-speed test curve of each measuring point signal；Two-speed curve is averaging processing and obtains to this building in fact
The testing result of heart stake pile body.Further, described building solid pile is specially solid circles foundation pile.
Further, described hammer action is hammered into shape by power or power rod vertically taps generation.
Further, described beating point position is: the arbitrfary point of stake top surface, including pile center.
Further, described signal pickup assembly is probe or sensor.
Further, described signal pickup assembly is pasted onto described building by stickums such as glue, butter or plasticine
On thing solid pile stake top surface.
Further, described signal pickup assembly connects the information having the signal being gathered signal pickup assembly to process
Processing means.
Further, described information processor specially has the low strain integrity testing instrument of two-speed pattern.
Further, step " when receiving the hammer action at beating point, obtains from each signal pickup assembly simultaneously
Measuring point signal and obtain comprising the two-speed test curve of each measuring point signal " particularly as follows:
When signal pickup assembly receives the beat action at beating point, the letter being connected with signal pickup assembly
Breath processing means is triggered, and information processor obtains simultaneously and records from be positioned at building solid pile stake top surface two
The measuring point signal of signal pickup assembly also obtains corresponding two-speed test curve.
Step " is averaging processing the testing result obtained this building solid pile pile body " specifically to two-speed curve
For:
To the two-speed signal obtained by information processor and carry out signal averaging, generate the single speed of one
Curve.
The technical scheme that embodiment disclosed by the invention provides can include following beneficial effect: a kind of of the present invention builds
The low strain dynamic two-speed signal averaging detection method of thing solid pile, by striking at building solid pile pile body end face arbitrfary point
Hit, utilize two signal pickup assemblies to obtain the two-speed of two sampling point positions on and 135 ° of radiuses at 45 ° with beating point and survey
Examination curve, by the average treatment to two-speed signal, can substantially eliminate and result from the three-dimensional at a top because bias taps
Interference signal and with the wobbler action shearing wave propagated along pile body.What signal averaging obtained is a single signal curve, it
Can help more accurately to judge the integrity of building solid pile pile body.
For making the above-mentioned purpose of the present invention, feature and advantage to become apparent, section Example cited below particularly, and coordinate
Appended accompanying drawing, is described in detail below:
Accompanying drawing explanation
In order to be illustrated more clearly that the technical scheme of the embodiment of the present invention, below by embodiment required use attached
Figure is briefly described, it will be appreciated that the following drawings illustrate only certain embodiments of the present invention, and it is right to be therefore not construed as
The restriction of scope, for those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to according to this
A little accompanying drawings obtain other relevant accompanying drawings.
Fig. 1 is the flow process signal of the low strain dynamic two-speed signal averaging detection method of the present invention a kind of building solid pile
Figure；
Fig. 2 is the structural representation of the low strain dynamic two-speed signal averaging detection method of the present invention a kind of building solid pile
Figure；
Fig. 3 be the structural representation shown in Fig. 2 concrete longitudinal wave velocity 4050m/s, Poisson's ratio 0.28, stake footpath 2.9m,
Stake long 25m, load pulsewidth 1.6ms under the conditions of, the 0.75R of any radius of stake end face at percussion, with beating point place radius
Time-history curves effect schematic diagram before and after the low strain dynamic two-speed signal averaging of sampling at 0.53R at 45 ° and 135 ° of radiuses.Its
In, 0.53R is that Poisson's ratio 0.28 is updated to the sampling location that (0.67-0.5 υ) R obtains；
Fig. 4 be the structural representation shown in Fig. 2 concrete longitudinal wave velocity 4050m/s, Poisson's ratio 0.28, stake footpath 2.9m,
Under the conditions of stake long 25m, load pulsewidth 1.6ms, when tapping at 0R, 0.25R, 0.55R, 0.75R of any radius of stake end face,
The time-history curves of the low strain dynamic two-speed average signal of sampling at 0.53R on and 135 ° of radiuses at 45 ° with beating point place radius
Contrast schematic diagram.Wherein, 0.53R is that Poisson's ratio 0.28 is updated to the sampling location that (0.67-0.5 υ) R obtains；
Fig. 5 is concrete longitudinal wave velocity 4050m/s, Poisson's ratio 0.28, stake footpath 2.9m, the long 25m of stake, load pulsewidth 1.6ms
Under the conditions of, the low strain dynamic two-speed signal averaging detection method of the present invention a kind of building solid pile is at any radius of stake end face
Tapping at 0.75R, the low strain dynamic two-speed sampled at 0.53R on and 135 ° of radiuses at 45 ° with beating point place radius is average
Signal taps at stake top surface midpoint with prior art, the time-history curves comparison diagram of sampled signal at pile center 2/3 radius；
Fig. 6 is the equivalent schematic of the structural representation shown in Fig. 2；
Fig. 7 is the replacement scheme knot of the low strain dynamic two-speed signal averaging detection method of the present invention a kind of building solid pile
Structure schematic diagram；
Fig. 8 is that the replacement scheme structural representation shown in Fig. 7 is in concrete longitudinal wave velocity 4050m/s, Poisson's ratio 0.28, stake
Under the conditions of footpath 2.9m, the long 25m of stake, load pulsewidth 1.6ms, at the 0.53R of any radius of stake top surface tap, with beating point
Place radius is vertical diametrically, the low strain dynamic signal of sampling at stake midpoint 0R (stake midpoint), 0.05R, 0.1R, 0.15R
Time-history curves contrast schematic diagram；Wherein, R is radius, and 0.53R is striking that Poisson's ratio 0.28 is updated to (0.67-0.5 υ) R obtains
Hit a position；
Fig. 9 is in concrete longitudinal wave velocity 4050m/s, Poisson's ratio 0.28, stake footpath 2.9m, the long 25m of stake, load pulsewidth
Under the conditions of 1.6ms, at the 0.53R of any radius in stake top during eccentric percussion, the alternative structure schematic diagram shown in Fig. 7 is at stake midpoint
The time-history curves contrast of the two-speed average signal that the structural representation shown in the signal gathered and Fig. 2 is sampled at 0.53R
Figure.Wherein, 0.53R is the result of calculation that Poisson's ratio 0.28 is updated to (0.67-0.5 υ) R.
Main element symbol description:
100-reality cross section circle foundation pile；200-exciting device (power hammer or power rod)；
300-information collecting device (probe or sensor)；(having the low of two-speed pattern should for 400-information processor
Become detector, replacement scheme uses one velocity pattern)
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Describe, it is clear that described embodiment is only a part of embodiment of the present invention rather than whole embodiments wholely.Generally
Can with various different configurations arrange and design with the assembly of the embodiment of the present invention that show described in accompanying drawing herein.Cause
This, be not intended to limit claimed invention to the detailed description of the embodiments of the invention provided in the accompanying drawings below
Scope, but it is merely representative of the selected embodiment of the present invention.Based on embodiments of the invention, those skilled in the art are not doing
The every other embodiment obtained on the premise of going out creative work, broadly falls into the scope of protection of the invention.
Unless otherwise defined, all of technology used in the present invention and scientific terminology and the technical field belonging to the present invention
The implication that is generally understood that of technical staff identical.The present invention building solid pile bias tap under low strain dynamic two-speed letter
The term used in the description of number detection method is intended merely to describe the purpose of specific embodiment, it is not intended that limit this
Invention.Term used in the present invention " and/or " include arbitrary and all of group of one or more relevant Listed Items
Close.
Below in conjunction with the accompanying drawings, the detailed description of the invention of the present invention is elaborated.
Embodiment 1
Fig. 1 is the flow process signal of the low strain dynamic two-speed signal averaging detection method of the present invention a kind of building solid pile
Figure.The low strain dynamic two-speed signal averaging detection method of this building solid pile is applied on building solid pile pile body, the party
Method comprises the following steps:
In step s 11, building solid pile pile body end face arranges beating point.
Specifically, described building solid pile is solid circles foundation pile, and described hammer action is for hammering into shape by power or power rod enters
Row is vertical to be tapped, and beating point may be located at the optional position of a top surface, including pile center.
In one embodiment of this invention, described building solid circles foundation pile pile body.Beating point is positioned at a top surface
(see Fig. 3) at 0.75R.
In one embodiment of this invention, described building solid circles foundation pile pile body.Beating point is positioned at a top surface
(see Fig. 4) at 0R (pile center), 0.25R, at 0.55R, at 0.75R.
It is appreciated that described building solid pile, except cylindrical pile body, can be also other shape, as square pile is many with other
Limit shape solid pile, as long as i.e. using the low strain dynamic two-speed signal averaging detection method of the present invention to detect the solid pile body of building
Broadly fall into the design of the present invention.
In step s 12, under the conditions of known to pile concrete Poisson's ratio, at building solid pile stake top surface, with
Beating point place radius is at 45 ° and installs two signal pickup assembly conducts at (0.67-0.5 υ) R on two radiuses of 135 °
Measuring point to building solid pile pile body, wherein, υ is pile concrete Poisson's ratio, and R is foundation pile radius.
Under conditions of pile concrete Poisson's ratio the unknown, two signal pickup assemblies are installed on above-mentioned two radiuses
Position at the 2/3 of steel reinforcement cage radius；I.e. at building solid pile stake top surface, at 45 ° with beating point place radius and 135 °
Article two, at 2/3 of the steel reinforcement cage radius on radius, two signal pickup assemblies are installed as to building solid pile pile body in position
Measuring point.
Specifically, described signal pickup assembly is probe or sensor.Described signal pickup assembly by glue, butter or
The stickums such as plasticine are pasted onto described building solid pile stake top surface.In condition known to pile concrete Poisson's ratio
Under, (the 0.67-0.5 at building solid pile stake top surface, on and two radiuses of 135 ° at 45 ° with beating point place radius
υ) installing two signal pickup assemblies at R as the measuring point to building solid pile pile body, wherein, υ is pile concrete Poisson
Ratio, R is foundation pile radius.Wherein, (0.67-0.5 υ) R is according to the pile-soil model big gauge under change material and geometric parameter
The experience calculation expression obtained, Practical Project checking shows, the application effect of this calculating formula is preferable.Additionally, mix at pile body
Under conditions of the Poisson's ratio the unknown of solidifying soil, then two signal pickup assemblies are installed on above-mentioned two radiuses the 2/ of steel reinforcement cage radius
Position at 3, this is owing to common concrete Poisson's ratio excursion is about within 0.1～0.35, then the change of (0.67-0.5 υ) R
Change scope is between 0.5R～0.62R, it is contemplated that the thickness of concrete cover of steel reinforcement cage, and this excursion the most more connects
At the 2/3 of nearly steel reinforcement cage radius.So, under conditions of pile concrete Poisson's ratio the unknown, by two signal pickup assembly peaces
At the 2/3 of the steel reinforcement cage radius being located on and two radiuses of 135 ° at 45 ° with beating point place radius.
In step s 13, when receiving the hammer action at beating point, obtain from each signal pickup assembly simultaneously
Measuring point signal and obtain comprising the two-speed test curve of each measuring point signal；
Specifically, being connected with described signal pickup assembly, the signal being gathered signal pickup assembly processes
Information processing apparatus be set to the low strain integrity testing instrument with two-speed pattern, such as dual pathways low strain integrity testing instrument.In the present invention one
Plant in the low strain dynamic two-speed signal averaging detection method of building solid pile, due to two signal pickup assemblies and beating point
Distance is different, in order to ensure the accuracy of the phase contrast of time difference that between each measuring point, Mintrop wave is incident and interference signal, it is necessary to
Use the low strain integrity testing instrument with two-speed pattern, and sample under two-speed pattern simultaneously.
When receiving the beat action at beating point, by low strain integrity testing instrument, obtain two signals simultaneously and adopt
The measuring point signal of acquisition means and obtain corresponding two-speed test curve, repeatedly taps and will gather multiple two-speed signal.When holding
When row signal preserves, a plurality of two-speed signal will be averaged into being a two-speed signal, and when i.e. signal preserves, instrument is according to logical
Road (or sensor) is the signal averaging that unit is carried out, in other words, signal preserve time, instrument automatically by same probe (or survey
Point) under repeatedly tapping, the signal that obtains is averaged, and its objective is to verify the repeatability of signal, stability, and eliminate
Secondary disturbances or artificial disturbance.
In step S14, two-speed curve is averaging processing and obtains the knot of the detection to this building solid pile pile body
Really；
Specifically, step S14 specifically includes: to the double speed comprising each measuring point signal obtained by information processor
Degree test curve carries out signal averaging, generates a single rate curve.In actual application scenarios, can be in information processing
The signal processing interface of device low strain integrity testing instrument is average by two curves in two-speed signal, or is led by two-speed signal
Enter in the signal analysis software supporting with low strain integrity testing instrument and carry out signal averaging, it is possible to export to other data processing software
In be averaged.Average result be obtain one average after single rate curve.
The low strain dynamic two-speed signal averaging detection method of the building solid pile of the present invention, by building solid pile
Stake top surface arbitrfary point taps, at the two-speed signal curve of corresponding two the specific measuring points of stake top surface collection and averagely obtain one
Bar single signal curve.By signal averagely eliminate the three-dimensional interference signal resulted from tapping areas and with along pile body
The eccentric moment shearing wave that column is propagated, thus expand the range of choice of beating point the most significantly, and can help more accurate
The true pile body integrity judging building solid pile pile body.
Embodiment 2
Fig. 2 is the structural representation of the low strain dynamic two-speed signal averaging detection method of the present invention a kind of building solid pile
Figure.In the present embodiment, building solid pile is solid circles foundation pile.
Exciting device 200 produces eccentric hammer action at the stake top surface arbitrfary point of solid pile 100, at pile concrete
Under conditions of Poisson's ratio the unknown, at the stake top surface of building solid pile 100, at 45 ° with beating point place radius and 135 °
Article two, at (0.67-0.5 υ) R on radius, install two signal pickup assemblies 300 as the survey to building solid pile pile body
Point, wherein, υ is pile concrete Poisson's ratio, and R is foundation pile radius.Under the conditions of known to pile concrete Poisson's ratio, then by two
Individual signal pickup assembly is installed in position at 2/3 of the steel reinforcement cage radius on above-mentioned two radiuses；Information processor 400 is tool
Having the low strain integrity testing instrument of two-speed pattern, test pattern uses two-speed pattern.
When exciting device 200 solid pile 100 stake top surface produce a beat action time, by sensor and low should
Become detector, a two-speed test curve comprising two measuring point signals can be obtained.When exciting device produces again in same point
During raw hammer action, obtain the two-speed signal that Article 2 comprises two rate curves, repeatedly tap and will gather multiple two-speed
Signal, when signal preserves, instrument is the signal averaging that unit is carried out according to passage (or sensor), and we will obtain a bag
Two-speed signal containing two test curves.Follow-up, will be double at the signal processing interface of information processor low strain integrity testing instrument
Two curves in rate signal are average, or two-speed signal is imported the signal analysis software supporting with low strain integrity testing instrument
In carry out signal averaging, it is possible to export to other data processing software is averaged.Average result is to obtain one to put down
Single rate curve after all.
Seeing also Fig. 3, Fig. 3 is that the structural representation shown in Fig. 2 is in concrete longitudinal wave velocity 4050m/s, Poisson's ratio
0.28, under the conditions of stake footpath 2.9m, the long 25m of stake, load pulsewidth 1.6ms, at the 0.75R of any radius of stake end face tap, with
Beating point place radius is at 45 ° and on 135 ° of radiuses, at 0.53R, time-histories before and after the low strain dynamic two-speed signal averaging of sampling is bent
Line effect schematic diagram.Wherein, 0.53R is that Poisson's ratio 0.28 is updated to the sampling location that (0.67-0.5 υ) R obtains, and averagely believes
Number refer to the carrying out of two single point signals at 0.53R on corresponding 45 ° and 135 ° of radiuses respectively in low strain dynamic two-speed signal
The signal averagely obtained, wherein, " averagely " specifically refers to two corresponding to upper for transverse axis (time shaft or stake are long) synchronization
The numerical value (vertical velocity value) of the axis of ordinates that single channel (single-point) is believed is averaged.
Fig. 3 shows, after and the signal averaging of 135 ° of two measuring points at 45 ° with beating point, and the three-dimensional interference letter of average signal
Number being obviously reduced and eliminate the wobbler action shearing wave at signal rear portion, therefore, the two-speed proposed by this patent is average
Method can significantly eliminate the interference signal in single channel (single-point) signal, thus helps to judge that building is solid more accurately
The integrity of stake pile body.
Seeing also Fig. 4, Fig. 4 is that the structural representation shown in Fig. 2 is in concrete longitudinal wave velocity 4050m/s, Poisson's ratio
0.28, under the conditions of stake footpath 2.9m, the long 25m of stake, load pulsewidth 1.6ms, the 0R of any radius of stake end face, 0.25R, 0.55R,
When tapping at 0.75R, the low strain dynamic two-speed that 0.53R place samples on and 135 ° of radiuses at 45 ° with beating point place radius is flat
All time-history curves contrast schematic diagrams of signal；Note 0.53R is that Poisson's ratio 0.28 is updated to the sampling that (0.67-0.5 υ) R obtains
Position.Fig. 4 shows, the low strain dynamic two-speed signal averaging detection method of a kind of building solid pile that the present invention provides, and works as change
Changing beating point position, the difference of the time-history curves of two-speed average signal is less, and test effect approximation is consistent.So, the present invention
The low strain dynamic two-speed signal averaging detection method of a kind of building solid pile provided, can expand the choosing of beating point significantly
Select scope.
The principle of low strain dynamic two-speed signal averaging detection method of the building solid pile that the present invention proposes is: when
Building solid pile pile body end face tap, in solid pile pile body except create along pile body propagate compressional wave, with impacting point
The both sides of the vertical section at the diameter place of place radius angle in 90 °, there is also three-dimensional interference ripple and the bias of antisymmetry distribution
Moment shearing wave.When collection simultaneously is at 45 ° with beating point place radius and the letter of two measuring points of ad-hoc location on 135 ° of radiuses
Number and average, both impacts after can eliminating the most significantly.From being construed to of pile body vibration angle, in building solid pile stake
Surface taps, and not only creates the axisymmetric vibration shape, and creates the nonaxisymmetrical vibration shape.When simultaneously gather and beating point
Place radius is at 45 ° and the signal of ad-hoc location average on 135 ° of radiuses, can eliminate the non-axis symmetry vibration shape the most significantly
Impact.
Fig. 5 is concrete longitudinal wave velocity 4050m/s, Poisson's ratio 0.28, stake footpath 2.9m, the long 25m of stake, load pulsewidth 1.6ms
Under the conditions of, the low strain dynamic two-speed signal averaging detection method of the present invention a kind of building solid pile is at any radius of stake end face
Tapping at 0.75R, the low strain dynamic two-speed sampled at 0.53R on and 135 ° of radiuses at 45 ° with beating point place radius is average
Signal taps at stake top surface midpoint with prior art, the time-history curves comparison diagram of sampled signal at pile center 2/3 radius.
Fig. 5 shows, the interference signal compared with the sampling plan that existing method specifies, in the two-speed average signal that the present invention proposes
It is obviously reduced.
Knot due to the low strain dynamic two-speed signal averaging detection method at building solid pile a kind of shown in Fig. 2 of the present invention
In structure schematic diagram, structure is symmetrical with the vertical section at beating point and line place, stake midpoint, so, shown in scheme shown in Fig. 2 and Fig. 6
The testing result of scheme is consistent, i.e. Fig. 6 is the equivalent schematic of the structural representation shown in Fig. 2, and related content is the most superfluous
State.
Additionally, due to structure is symmetrical with the vertical section at beating point and line place, stake midpoint, can be further by shown in Fig. 2
Structural representation and with two measuring points of the equivalent schematic shown in Fig. 6 along by the vertical section of beating point place diameter with
Time do mirror image, the test result that the combination of measuring point after mirror image obtains and Fig. 2 and Fig. 6 equivalence.So, in real work, and in reality
Tap corresponding measuring point at the arbitrfary point of heart stake stake top surface is disposed with 4 kinds of combinations, i.e. measuring point cloth shown in Fig. 2 and Fig. 6
Put combination and both do the combination of the point layout after mirror image.
Embodiment 3
Fig. 7 is the replacement scheme knot of the low strain dynamic two-speed signal averaging detection method of the present invention a kind of building solid pile
Structure schematic diagram.In the present embodiment, building solid pile is for real cross section circle stake.Particularly as follows:
Under the conditions of known to pile concrete Poisson's ratio, exciting device 200 is at the stake top surface of building solid pile 100
Producing eccentric hammer action at arbitrarily (0.67-0.5 υ) R on radius, wherein, υ is pile concrete Poisson's ratio, and R is foundation pile half
Footpath；Under conditions of pile concrete Poisson's ratio the unknown, exciting device 200 is any at the stake top surface of building solid pile 100
At 2/3 of steel reinforcement cage radius on radius, position produces eccentric hammer action.At the stake top surface of building solid pile 100, with
Beating point place radius is vertical diametrically, in the range of each 0.15R in pile center left and right, altogether in the range of 0.3R length, installs
At least one signal pickup assembly 300 is as the measuring point to building solid pile pile body；At this signal pickup assembly 300 and information
Reason device 400 is connected, and information processor 400 is low strain integrity testing instrument, and uses one velocity pattern.
Concrete percussion is consistent with existing method with sampling step, and here is omitted.
Seeing also Fig. 8, Fig. 8 is that the replacement scheme structural representation shown in Fig. 7 is at concrete longitudinal wave velocity 4050m/
Under the conditions of s, Poisson's ratio 0.28, stake footpath 2.9m, the long 25m of stake, load pulsewidth 1.6ms, at the 0.53R of any radius of stake top surface
Tap, vertical diametrically with beating point place radius, sample at stake midpoint 0R (stake midpoint), 0.05R, 0.1R, 0.15R
Low strain dynamic signal time-history curves contrast schematic diagram；Wherein, R is radius, and 0.53R is for be updated to (0.67-by Poisson's ratio 0.28
0.5 υ) beating position that obtains of R；Fig. 8 shows, the replacement scheme shown in Fig. 8 that the present invention provides, when with beating point place partly
Footpath is vertical diametrically, the signal received in the range of each 0.15R in pile center left and right, and the difference of their time-history curves is less,
Test effect approximation is consistent.Wherein, R is foundation pile radius.
It is long in concrete longitudinal wave velocity 4050m/s, Poisson's ratio 0.28, stake footpath 2.9m, stake for seeing also Fig. 9, Fig. 9
Under the conditions of 25m, load pulsewidth 1.6ms, eccentric percussion at the 0.53R of any radius in stake top, the alternative structure signal shown in Fig. 7
The two-speed average signal of sampling at 0.53R of structural representation shown in signal that figure is gathered at stake midpoint and Fig. 2
Time-history curves comparison diagram.Wherein, 0.53R is the result of calculation that Poisson's ratio 0.28 is updated to (0.67-0.5 υ) R.
Fig. 9 shows, two-speed averaging method and replacement scheme test effect thereof that the present invention proposes are close, but two-speed is average
The sample effect of method is slightly better than replacement scheme.
The low strain dynamic two-speed signal averaging detection method of the building solid pile of the present invention, by building solid pile
Stake top surface arbitrfary point taps, at the two-speed signal curve of corresponding two the specific measuring points of stake top surface collection and averagely obtain one
Bar single signal curve.By signal averagely eliminate the three-dimensional interference signal resulted from tapping areas and with along pile body
The eccentric moment shearing wave that column is propagated, judges more accurately with help at the bottom of pile body architecture quality and the stake of building pile body
Integrity.
It is pointed out that in the present invention, signal acquisition point and beating point angulation 45 ° and 135 ° have allowed certain model
The skew enclosed, signal acquisition point position on a radius has allowed a range of skew, the beating point given by replacement scheme
Position has allowed a range of skew.
The low strain dynamic two-speed signal averaging detection method of the building solid pile of the present invention mainly for solid circles stake,
But it is equally applicable to square and polygonal solid stake, as long as i.e. using the low strain dynamic two-speed signal averaging detection side of the present invention
The building solid pile that method detects broadly falls into the design of the present invention.For other example not be given, provided by the present invention
Device is identical, and its technique effect realizing principle and generation is similar with preceding method embodiment, for briefly describing, and embodiment of the method
The not mentioned part of part, refers to corresponding contents in preceding method embodiment.
Flow chart and block diagram in accompanying drawing show the system of multiple embodiments according to the present invention, method and computer journey
Architectural framework in the cards, function and the operation of sequence product.In this, each square frame in flow chart or block diagram can generation
One module of table, program segment or a part for code, a part for this module, program segment or code comprise one or more for
Realize the executable instruction of the logic function of regulation.It should also be noted that at some as in the realization replaced, square frame is marked
Function can also occur to be different from the order that marked in accompanying drawing.Such as, two continuous print square frames can essentially be basic
Being performed in parallel, they can also perform sometimes in the opposite order, and this is depending on involved function.It is also noted that
The combination of the square frame in each square frame in block diagram and/or flow chart and block diagram and/or flow chart, can be with performing regulation
Function or the special hardware based system of action realize, or can be with the combination of specialized hardware with computer instruction
Realize.
In several embodiments provided herein, it should be understood that disclosed mthods, systems and devices, permissible
Realize by another way.Device embodiment described above is only schematically, such as, and the division of this module, only
Being only a kind of logic function to divide, actual can have other dividing mode when realizing, and the most such as, multiple modules or assembly are permissible
In conjunction with or be desirably integrated into another system, or some features can be ignored, or does not performs.Another point, shown or discussed
Coupling each other direct-coupling or communication connection can be the indirect coupling by some communication interfaces, device or unit
Close or communication connection, can be electrical, machinery or other form.
Embodiment described above only have expressed the several embodiments of the present invention, and it describes more concrete and detailed, but also
Therefore the restriction to the scope of the claims of the present invention can not be interpreted as.It should be pointed out that, for those of ordinary skill in the art
For, without departing from the inventive concept of the premise, it is also possible to make some deformation and improvement, these broadly fall into the guarantor of the present invention
Protect scope.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (10)
1. the low strain dynamic two-speed signal averaging detection method of building solid pile, the low strain dynamic two-speed of this building solid pile
Signal averaging detection method is applied to building solid pile pile body, it is characterised in that the method comprising the steps of:
At building solid pile stake top surface, beating point is set；
Under the conditions of known to pile concrete Poisson's ratio, at building solid pile stake top surface, become with beating point place radius
Two signal pickup assemblies are installed as to building solid pile stake at (0.67-0.5 υ) R on two radiuses of 45 ° and 135 °
The measuring point of body, wherein, υ is pile concrete Poisson's ratio, and R is foundation pile radius；
Under conditions of pile concrete Poisson's ratio the unknown, at building solid pile stake top surface, become with beating point place radius
At 2/3 of steel reinforcement cage radius on two radiuses of 45 ° and 135 °, two signal pickup assemblies are installed as to building in position
The measuring point of solid pile pile body；
When receiving the hammer action at beating point, obtain from the measuring point signal of each signal pickup assembly simultaneously and obtain
Comprise the two-speed test curve of each measuring point signal；
Two-speed curve is averaging processing the testing result obtained this building solid pile pile body.
The low strain dynamic two-speed signal averaging detection method of building solid pile the most according to claim 1, its feature exists
In, described building solid pile is specially solid circles foundation pile.
The low strain dynamic two-speed signal averaging detection method of building solid pile the most according to claim 1, its feature exists
In, described hammer action is hammered into shape by power or power rod vertically taps generation.
The low strain dynamic two-speed signal averaging detection method of building solid pile the most according to claim 1, its feature exists
In, beating point is positioned at the arbitrfary point of a top surface, including pile center.
The low strain dynamic two-speed signal averaging detection method of building solid pile the most according to claim 1, its feature exists
In, this signal pickup assembly is probe or sensor.
The low strain dynamic two-speed signal averaging detection method of building solid pile the most according to claim 1, its feature exists
In, described signal pickup assembly is pasted onto described building solid pile stake top by stickums such as glue, butter or plasticine
Surface.
The low strain dynamic two-speed signal averaging detection method of building solid pile the most according to claim 1, its feature exists
In, described signal pickup assembly connects the information processor having the signal being gathered signal pickup assembly to process.
The low strain dynamic two-speed signal averaging detection method of building solid pile the most according to claim 7, its feature exists
In, described information processor specially has the low strain integrity testing instrument of two-speed pattern.
The low strain dynamic two-speed signal averaging detection method of building solid pile the most according to claim 1, its feature exists
In, step " when receiving the hammer action at beating point, obtain simultaneously from each signal pickup assembly measuring point signal and
Obtain comprising the two-speed test curve of each measuring point signal " particularly as follows:
When signal pickup assembly receives the beat action at beating point, at the information being connected with signal pickup assembly
Reason device is triggered, and information processor obtains simultaneously and records from two signals being positioned at building solid pile stake top surface
The measuring point signal of harvester also obtains corresponding two-speed test curve.
10. according to low strain dynamic two-speed its feature of signal averaging detection method of the building solid pile described in claim 1 or 7
Be, step " two-speed curve is averaging processing the testing result obtained this building solid pile pile body " particularly as follows:
The two-speed signal obtained by information processor is carried out signal averaging, generates the single rate curve of.
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| CN201810882446.XA CN108930295B (en) | 2016-08-24 | 2016-08-24 | Low-strain eccentric knocking single-point sampling method for foundation pile |
| CN201610717737.4A CN106320396B (en) | 2016-08-24 | 2016-08-24 | The low strain dynamic two-speed signal averaging detection method of building solid pile |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107142977A (en) * | 2017-07-10 | 2017-09-08 | 荣垂强 | Low strain dynamic two-speed signal averaging detection method under the percussion of building foundation center |
| CN107190789A (en) * | 2017-07-10 | 2017-09-22 | 荣垂强 | A kind of load pulsewidth system of selection of Low Strain Dynamic Testing of Piles |
| CN109098215A (en) * | 2018-08-23 | 2018-12-28 | 重庆大学 | A kind of low strain vibration test method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH109847A (en) * | 1996-06-26 | 1998-01-16 | Aoki Corp | Method for diagnosing shape of artificial or natural structure |
| CN102877490A (en) * | 2012-09-18 | 2013-01-16 | 河海大学 | Method for detecting quality of large-diameter tubular pile at low strain |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4954729B2 (en) * | 2007-01-29 | 2012-06-20 | 株式会社竹中工務店 | Concrete pile soundness evaluation support device, soundness evaluation support method, and soundness evaluation support program |
| CN103088849B (en) * | 2013-01-09 | 2016-04-06 | 山东正元地理信息工程有限责任公司 | A kind of servicing bridges foundation pile stress wave echo lossless detection method |
| CN104264718A (en) * | 2014-08-29 | 2015-01-07 | 汕头大学 | Pile foundation integrality detection method |
-
2016
- 2016-08-24 CN CN201610717737.4A patent/CN106320396B/en not_active Expired - Fee Related
- 2016-08-24 CN CN201810882446.XA patent/CN108930295B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH109847A (en) * | 1996-06-26 | 1998-01-16 | Aoki Corp | Method for diagnosing shape of artificial or natural structure |
| CN102877490A (en) * | 2012-09-18 | 2013-01-16 | 河海大学 | Method for detecting quality of large-diameter tubular pile at low strain |
Non-Patent Citations (2)
| Title |
|---|
| 李孟强: "低应变偏心纵敲桩顶三维效应分析", 《山西建筑》 * |
| 薛桂霞等: "基桩桩身完整性检测中的影响因素浅析", 《地球物理学进展》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107142977A (en) * | 2017-07-10 | 2017-09-08 | 荣垂强 | Low strain dynamic two-speed signal averaging detection method under the percussion of building foundation center |
| CN107190789A (en) * | 2017-07-10 | 2017-09-22 | 荣垂强 | A kind of load pulsewidth system of selection of Low Strain Dynamic Testing of Piles |
| CN107190789B (en) * | 2017-07-10 | 2018-07-13 | 荣垂强 | A kind of load pulsewidth selection method of Low Strain Dynamic Testing of Piles |
| CN109098215A (en) * | 2018-08-23 | 2018-12-28 | 重庆大学 | A kind of low strain vibration test method |
| CN109098215B (en) * | 2018-08-23 | 2020-09-22 | 重庆大学 | Low-strain detection method for pile foundation |
Also Published As
| Publication number | Publication date |
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| CN108930295B (en) | 2020-07-10 |
| CN108930295A (en) | 2018-12-04 |
| CN106320396B (en) | 2018-09-14 |
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