CN106320396B - The low strain dynamic two-speed signal averaging detection method of building solid pile - Google Patents
The low strain dynamic two-speed signal averaging detection method of building solid pile Download PDFInfo
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- CN106320396B CN106320396B CN201610717737.4A CN201610717737A CN106320396B CN 106320396 B CN106320396 B CN 106320396B CN 201610717737 A CN201610717737 A CN 201610717737A CN 106320396 B CN106320396 B CN 106320396B
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- 239000007787 solid Substances 0.000 title claims abstract description 110
- 238000012935 Averaging Methods 0.000 title claims abstract description 55
- 238000001514 detection method Methods 0.000 title claims abstract description 44
- 238000010009 beating Methods 0.000 claims abstract description 52
- 238000012360 testing method Methods 0.000 claims abstract description 24
- 230000009471 action Effects 0.000 claims abstract description 19
- 238000000034 method Methods 0.000 claims abstract description 17
- 230000000712 assembly Effects 0.000 claims abstract description 13
- 238000000429 assembly Methods 0.000 claims abstract description 13
- 238000012545 processing Methods 0.000 claims abstract description 12
- 230000010365 information processing Effects 0.000 claims description 14
- 238000011016 integrity testing Methods 0.000 claims description 14
- 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
- 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
- 238000010586 diagram Methods 0.000 description 28
- 238000005070 sampling Methods 0.000 description 15
- 230000000694 effects Effects 0.000 description 10
- 230000008859 change Effects 0.000 description 6
- 238000009527 percussion Methods 0.000 description 6
- 238000010008 shearing Methods 0.000 description 6
- 230000000644 propagated effect Effects 0.000 description 5
- 239000000523 sample Substances 0.000 description 5
- 238000010079 rubber tapping Methods 0.000 description 4
- 238000004364 calculation method Methods 0.000 description 3
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- 238000005859 coupling reaction Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 230000013011 mating Effects 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 239000012491 analyte Substances 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
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- 238000005516 engineering process Methods 0.000 description 1
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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 present invention provides a kind of low strain dynamic two-speed signal averaging detection method of building solid pile, and the low strain dynamic two-speed signal averaging detection method of the building solid pile is applied to common building solid pile pile body, and the method comprising the steps of：It is tapped at the arbitrary point of building solid stake top surface；Under the conditions of known to pile concrete Poisson's ratio and under conditions of pile concrete Poisson's ratio is unknown, two signal pickup assemblies are arranged according to different situations respectively；When receiving the hammer action in beating point, while obtaining the measuring point signal from each signal pickup assembly and obtaining including the two-speed test curve of each measuring point signal；Two-speed curve is averaging processing to obtain the testing result to the building solid pile pile body.With this significant range of choice for expanding beating point, obtained testing result can more accurately judge the pile body integrity of building solid pile pile body.
Description
Technical field
The present invention relates to building analyte detection fields, in particular to a kind of low strain dynamic two-speed of building solid pile
Signal averaging detection method.
Background technology
The low change method that should detect of existing common foundation pile applies the transient batting of low energy on stake top surface, taps generation
Shock wave is propagated downwards along pile body, back wave will be generated when encountering the medium side or stake bottom that wave impedance changes, according to back wave
Characteristics of signals judges pile quality.
Currently, there are problems that in the low strain integrity testing detection scheme of existing solid circles foundation pile：
Firstly, for the low strain integrity testing of solid circles foundation pile, existing pile detection specification and most of researchs are all adopted
It is tapped with pile center, still, pile center is an extremely special point of stake top face, and it is stake top face arbitrary point that pile center, which taps,
The special case tapped, that is to say, that existing sampling plan will hit against a position and be confined to pile center.But in Practical Project,
Pile center is the position of the conduit of casting concrete, constructional deficiency often occurs since tube drawing is improper, at this, necessary at this time
It is tapped using bias.So can not ensure that center taps in a practical situation.
Secondly, it when solid pile is tapped using eccentric, is vertically passed at this point, being produced as not only being tapped with center in pile body
The longitudinal wave broadcast, with the increase of stake diameter, bias, which taps, also creates significant wobbler action shearing wave, and three-dimensional disturbing effect
Also dramatically different under being tapped with center.But in the scheme in terms of the vertical eccentric percussion of current foundation pile low strain dynamic, and
Eccentric percussion is not accounted for, does not account for more how eliminating the special three-dimensional interference signal and bias generated because bias taps
Acting shear wave.
So, it would be desirable to a kind of sampling side that interference signal can be effectively eliminated when stake top face arbitrary point taps
Case.
Invention content
The embodiment of the present invention is designed to provide a kind of low strain dynamic two-speed signal averaging detection of building solid pile
Method, to help to expand the beating point range of choice of solid pile low-strain measurement and accurately judge building solid pile pile body
Integrality.
To solve the problems, such as that existing solid low strain detection of the pile, the technical solution adopted by the present invention be：One kind is built
Build the low strain dynamic two-speed signal averaging detection method of object solid pile, the low strain dynamic two-speed signal averaging of the building solid pile
Detection method is applied to building solid circles pile body, and the method comprising the steps of：
On building solid stake top surface, beating point is set；
Under the conditions of known to pile concrete Poisson's ratio, on the solid stake top surface of building, with where beating point half
Diameter is at 45 ° and 135 ° of two radiuses on (0.67-0.5 υ) R at install two signal pickup assemblies be used as it is solid to building
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 is unknown, on the solid stake top surface of building, with where beating point half
Position is installed two signal pickup assemblies and is used as to building at the 2/3 of diameter steel reinforcement cage radius at 45 ° and on 135 ° of two radiuses
Build the measuring point of object solid pile pile body；
When receiving the hammer action in beating point, at the same obtain measuring point signal from each signal pickup assembly and
Obtain including the two-speed test curve of each measuring point signal；Two-speed curve is averaging processing to obtain to building reality
The testing result of heart stake pile body.Further, the building solid pile is specially solid circles foundation pile.
Further, the hammer action is hammered into shape by power or power stick carries out vertical tap and generates.
Further, the beating point position is：The arbitrary point on stake top surface, including pile center.
Further, the signal pickup assembly is probe or sensor.
Further, the signal pickup assembly is pasted onto the building by stickums such as glue, butter or plasticine
On the solid stake top surface of object.
Further, the signal pickup assembly is connected with the information that the signal acquired to signal pickup assembly is handled
Processing unit.
Further, described information processing unit is specially the low strain integrity testing instrument with two-speed pattern.
Further, step " when receiving the hammer action in beating point, while obtaining and coming from each signal pickup assembly
Measuring point signal and obtain including the two-speed test curve of each measuring point signal " be specially：
When signal pickup assembly receives the letter being connected with signal pickup assembly when a beat for beating point is acted
Breath processing unit is triggered, and information processing unit is obtained and recorded from positioned at two of the solid stake top surface of building simultaneously
The measuring point signal of signal pickup assembly simultaneously obtains corresponding two-speed test curve.
Step " two-speed curve is averaging processing to obtain the testing result to the building solid pile pile body " is specific
For：
To the two-speed signal obtained by information processing unit and signal averaging is carried out, generates one single speed
Curve.
The technical solution that embodiment disclosed by the invention provides may include following advantageous effect：A kind of building of the present invention
The low strain dynamic two-speed signal averaging detection method of object solid pile, by being struck at the arbitrary point of building solid pile pile body top surface
Hit, using two signal pickup assemblies obtain with beating point is at 45 ° and 135 ° of radiuses on the two-speeds of two sampling point positions survey
Curve is tried, by the average treatment to two-speed signal, the three-dimensional for resulting from stake top portion because of bias percussion can be substantially eliminated
Interference signal and with the wobbler action shearing wave propagated along pile body.What signal averaging obtained is a single signal curve, it
It can help more accurately to judge the integrality of building solid pile pile body.
To enable the above objects, features and advantages of the present invention to be clearer and more comprehensible, section Example cited below particularly, and coordinate
Appended attached drawing, is described in detail below：
Description of the drawings
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below will be to needed in the embodiment attached
Figure is briefly described, it should be understood that the following drawings illustrates only certain embodiments of the present invention, therefore is not construed as pair
The restriction of range for those of ordinary skill in the art without creative efforts, can also be according to this
A little attached drawings obtain other relevant attached drawings.
Fig. 1 is a kind of flow signal of low strain dynamic two-speed signal averaging detection method of building solid pile of the present invention
Figure；
Fig. 2 is a kind of structural representation of the low strain dynamic two-speed signal averaging detection method of building solid pile of the present invention
Figure；
Fig. 3 be structural schematic diagram shown in Fig. 2 concrete longitudinal wave velocity 4050m/s, Poisson's ratio 0.28, stake diameter 2.9m,
Under the conditions of the long 25m of stake, load pulsewidth 1.6ms, the percussion the 0.75R of the arbitrary radius in stake top face at, with beating point where radius
Time-history curves effect diagram before and after the low strain dynamic two-speed signal averaging sampled 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 is obtained；
Fig. 4 be structural schematic diagram shown in Fig. 2 concrete longitudinal wave velocity 4050m/s, Poisson's ratio 0.28, stake diameter 2.9m,
Under the conditions of the long 25m of stake, load pulsewidth 1.6ms, when being tapped at 0R, 0.25R, 0.55R, 0.75R of the arbitrary radius in stake top face,
With radius is at 45 ° where beating point and 135 ° of radiuses at 0.53R the low strain dynamic two-speed average signal of sampling time-history curves
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 is obtained；
Fig. 5 is concrete longitudinal wave velocity 4050m/s, Poisson's ratio 0.28, stake diameter 2.9m, the long 25m of stake, load pulsewidth 1.6ms
Under the conditions of, a kind of low strain dynamic two-speed signal averaging detection method of building solid pile of the present invention is in the arbitrary radius in stake top face
Tapped at 0.75R, with beating point where radius is at 45 ° and 135 ° of radiuses on the low strain dynamic two-speed of the places 0.53R sampling be averaged
Signal and the prior art tap at stake top surface midpoint, the time-history curves comparison diagram away from sampled signal at 2/3 radius of pile center；
Fig. 6 is the equivalent schematic of structural schematic diagram shown in Fig. 2；
Fig. 7 is a kind of alternative solution knot of the low strain dynamic two-speed signal averaging detection method of building solid pile of the present invention
Structure schematic diagram；
Fig. 8 is alternative solution structural schematic diagram shown in Fig. 7 in concrete longitudinal wave velocity 4050m/s, Poisson's ratio 0.28, stake
Under the conditions of diameter 2.9m, the long 25m of stake, load pulsewidth 1.6ms, at the 0.53R of the arbitrary radius in stake top surface tap, with beating point
Place radius is vertical diametrically, away from the low strain dynamic signal sampled 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 to be struck what Poisson's ratio 0.28 was updated to that (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 diameter 2.9m, the long 25m of stake, load pulsewidth
Under the conditions of 1.6ms, at the 0.53R of the arbitrary radius of stake top when eccentric percussion, alternative structure schematic diagram shown in Fig. 7 is at stake midpoint
The time-history curves for the two-speed average signal that the signal and structural schematic diagram shown in Fig. 2 acquired samples at 0.53R compare
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 section circle foundation piles；200- exciting devices (power is hammered into shape or power stick)；
300- information collecting devices (probe or sensor)；400- information processing units (there is the low of two-speed pattern to answer
Become detector, one velocity pattern is used in alternative solution)
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Usually
It can arrange and design with a variety of different configurations with the component of the embodiment of the present invention that shows described in attached drawing here.Cause
This, the detailed description of the embodiment of the present invention to providing in the accompanying drawings is not intended to limit claimed invention below
Range, but it is merely representative of the selected embodiment of the present invention.Based on the embodiment of the present invention, those skilled in the art are not doing
The every other embodiment obtained under the premise of going out creative work, shall fall within the protection scope of the present invention.
Unless otherwise defined, all technical and scientific terms used in the present invention and the technical field for belonging to the present invention
The normally understood meaning of technical staff it is identical.Low strain dynamic two-speed letter of the present invention in building solid pile under eccentric tap
The term used in the description of number detection method, which is only for the purpose of describing specific embodiments, is not intended to limit this
Invention.Term used in the present invention " and/or " include any and all groups of one or more relevant Listed Items
It closes.
Below in conjunction with the accompanying drawings, it elaborates to the specific implementation mode of the present invention.
Embodiment 1
Fig. 1 is a kind of flow signal of low strain dynamic two-speed signal averaging detection method of building solid pile of the present invention
Figure.The low strain dynamic two-speed signal averaging detection method of the building solid pile is applied on building solid pile pile body, the party
Method includes the following steps：
In step s 11, beating point is set on building solid pile pile body top surface.
Specifically, the building solid pile be solid circles foundation pile, the hammer action be by power hammer or power stick into
Row is vertical to be tapped, and beating point can be located at any position on stake top surface, including pile center.
In one embodiment of this invention, the building solid circles foundation pile pile body.Beating point is located at stake top surface
(see Fig. 3) at 0.75R.
In one embodiment of this invention, the building solid circles foundation pile pile body.Beating point is located at stake top surface
At 0R (pile center), 0.25R, at 0.55R, at 0.75R (see Fig. 4).
It is appreciated that the building solid pile, can also be other shapes, such as square pile and other more in addition to cylindrical pile body
Side shape solid pile, as long as detecting the solid pile body of building using the low strain dynamic two-speed signal averaging detection method of the present invention
Belong to the design of the present invention.
In step s 12, known to pile concrete Poisson's ratio under the conditions of, on the solid stake top surface of building, with
Radius where beating point is at 45 ° and 135 ° of two radiuses on (0.67-0.5 υ) R at install two signal pickup assembly conducts
To the measuring point of 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 is unknown, two signal pickup assemblies are installed on above-mentioned two radiuses
Position at the 2/3 of steel reinforcement cage radius；It is at 45 ° and 135 ° with radius where beating point i.e. on the solid stake top surface of building
Two signal pickup assemblies are installed as to building solid pile pile body in position at 2/3 of steel reinforcement cage radius on two radiuses
Measuring point.
Specifically, the signal pickup assembly is probe or sensor.The signal pickup assembly by glue, butter or
The stickums such as plasticine are pasted onto the solid stake top surface of the building.The condition known to pile concrete Poisson's ratio
Under, on the solid stake top surface of building, with radius where beating point is at 45 ° and 135 ° of two radiuses on (0.67-0.5
Two signal pickup assemblies υ) are installed at R as the measuring point to building solid pile pile body, wherein υ is pile concrete Poisson
Than R is foundation pile radius.Wherein, (0.67-0.5 υ) R is the big gauge under change material and geometric parameter according to pile-soil model
Obtained experience calculation expression, Practical Project verification show that the application effect of the calculating formula is preferable.In addition, mixed in pile body
Under conditions of solidifying soil Poisson's ratio is unknown, then two signal pickup assemblies are installed in 2/ of steel reinforcement cage radius on above-mentioned two radiuses
Position at 3, this is because common concrete Poisson's ratio variation range is about within 0.1~0.35, then the change of (0.67-0.5 υ) R
Between change ranging from 0.5R~0.62R, it is contemplated that the thickness of concrete cover of steel reinforcement cage, this variation range actually more connect
At the 2/3 of nearly steel reinforcement cage radius.So under conditions of pile concrete Poisson's ratio is unknown, two signal pickup assemblies are pacified
Be located at radius where beating point is at 45 ° and 135 ° of two radiuses on steel reinforcement cage radius 2/3 at.
In step s 13, it when receiving the hammer action in beating point, while obtaining and coming from each signal pickup assembly
Measuring point signal and obtain including the two-speed test curve of each measuring point signal；
Specifically, it is connected with the signal pickup assembly, the signal acquired to signal pickup assembly is handled
Information processing apparatus be set to the low strain integrity testing instrument with two-speed pattern, such as binary channels low strain integrity testing instrument.In the present invention one
In the low strain dynamic two-speed signal averaging detection method of kind 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 difference of the time difference and interference signal of Mintrop wave incidence between each measuring point, it is necessary to
Using the low strain integrity testing instrument with two-speed pattern, and sampled simultaneously under two-speed pattern.
When receiving the beat action in beating point, by low strain integrity testing instrument, while obtaining two signals and adopting
The measuring point signal of acquisition means and corresponding two-speed test curve is obtained, multiple two-speed signals will be acquired by repeatedly tapping.When holding
When row signal preserves, a plurality of two-speed signal will be averaged into as a two-speed signal, i.e., when signal preserves, instrument is according to logical
Road (or sensor) be unit carry out signal averaging, in other words, signal preserve when, instrument automatically by it is same probe (or survey
Point) signal that is obtained under multiple tap is averaged, and the purpose is to the repeatability of checking signal, stability, and eliminate
Secondary disturbances or human interference.
In step S14, two-speed curve is averaging processing to obtain the detection knot to the building solid pile pile body
Fruit；
Specifically, step S14 is specifically included：To the double speed for including each measuring point signal obtained by information processing unit
It spends test curve and carries out signal averaging, generate a single rate curve.It, can be in information processing in actual application scenarios
Two curves in two-speed signal are averaged by the signal processing interface of device low strain integrity testing instrument, or two-speed signal is led
Enter and carry out signal averaging in the signal analysis software mating with low strain integrity testing instrument, can also export to other data processing softwares
In be averaged.It is average the result is that obtain one it is 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 arbitrary point tap, the corresponding two specific measuring points of stake top acquisition surface two-speed signal curve and averagely obtain one
Single signal curve.By signal it is average come eliminate result from the three-dimensional interference signal of tapping areas and with along pile body
The eccentric moment shearing wave that column is propagated to not only significantly expand the range of choice of beating point, but also can help more accurate
The true pile body integrity for judging building solid pile pile body.
Embodiment 2
Fig. 2 is a kind of structural representation of the low strain dynamic two-speed signal averaging detection method of building solid pile of the present invention
Figure.In the present embodiment, building solid pile is solid circles foundation pile.
Exciting device 200 generates eccentric hammer action at the stake top surface arbitrary point of solid pile 100, in pile concrete
It is at 45 ° and 135 ° with radius where beating point on the stake top surface of building solid pile 100 under conditions of Poisson's ratio is unknown
At (0.67-0.5 υ) R on two radiuses, two signal pickup assemblies 300 are installed 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
A signal pickup assembly is installed in position at 2/3 of the steel reinforcement cage radius on above-mentioned two radiuses；Information processing unit 400 is tool
There is the low strain integrity testing instrument of two-speed pattern, test pattern is using two-speed pattern.
When exciting device 200 is when the stake top surface of solid pile 100 generates beat action, by sensor and low answer
Become detector, a two-speed test curve for including two measuring point signals can be obtained.When exciting device produces again in same point
When raw hammer action, the two-speed signal that Article 2 includes two rate curves is obtained, multiple two-speeds will be acquired by repeatedly tapping
Signal, when signal preserves, for instrument according to the signal averaging that channel (or sensor) is that unit carries out, we will obtain a packet
Two-speed signal containing two test curves.It subsequently, will be double at the signal processing interface of information processing unit low strain integrity testing instrument
Two curves in speed signal are average, or two-speed signal is imported and the mating signal analysis software of low strain integrity testing instrument
Middle carry out signal averaging, can also export in other data processing softwares and be averaged.Average puts down the result is that obtaining one
Single rate curve after.
It is structural schematic diagram shown in Fig. 2 in concrete longitudinal wave velocity 4050m/s, Poisson's ratio also referring to Fig. 3, Fig. 3
0.28, under the conditions of stake diameter 2.9m, the long 25m of stake, load pulsewidth 1.6ms, at the 0.75R of the arbitrary radius in stake top face tap, with
Radius where beating point is at 45 ° and 135 ° of radiuses on the sampling of the places 0.53R low strain dynamic two-speed signal averaging before and after time-histories song
Line effect diagram.Wherein, 0.53R is that Poisson's ratio 0.28 is updated to the sampling location that (0.67-0.5 υ) R is obtained, average to believe
Number refer to that will correspond to the progress of two single point signals on 45 ° and 135 ° of radiuses at 0.53R in low strain dynamic two-speed signal respectively
The signal averagely obtained, wherein " average " specifically refers to two corresponding to synchronization on horizontal axis (time shaft or stake are long)
The numerical value (vertical velocity value) of the axis of ordinates of single channel (single-point) letter is averaged.
Fig. 3 show with after beating point is at 45 ° and the signal averaging of 135 ° of two measuring points, the three-dimensional interference letter of average signal
It number is obviously reduced and eliminates 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, to help more accurately to judge that building is solid
The integrality of stake pile body.
It is structural schematic diagram shown in Fig. 2 in concrete longitudinal wave velocity 4050m/s, Poisson's ratio also referring to Fig. 4, Fig. 4
0.28, under the conditions of stake diameter 2.9m, the long 25m of stake, load pulsewidth 1.6ms, 0R, 0.25R of the arbitrary radius in stake top face, 0.55R,
When being tapped at 0.75R, with beating point where radius is at 45 ° and 135 ° of radiuses on the low strain dynamic two-speed of the places 0.53R sampling put down
The time-history curves contrast schematic diagram of equal signal；Note 0.53R is that Poisson's ratio 0.28 is updated to the sampling that (0.67-0.5 υ) R is obtained
Position.Fig. 4 shows a kind of low strain dynamic two-speed signal averaging detection method of building solid pile provided by the invention, works as change
Change beating point position, the difference of the time-history curves of two-speed average signal is smaller, and test effect is approximate consistent.So the present invention
A kind of low strain dynamic two-speed signal averaging detection method of the building solid pile provided, can significantly expand the choosing of beating point
Select range.
The principle of the low strain dynamic two-speed signal averaging detection method of building solid pile proposed by the present invention is：When
Building solid pile pile body top surface tap, in addition to producing the longitudinal wave propagated along pile body in solid pile pile body, with impacting point
The both sides of vertical section where the diameter of place radius angle in 90 °, there is also the three-dimensional interference waves and bias of antisymmetry distribution
Torque shearing wave.When acquisition simultaneously with radius is at 45 ° where beating point and 135 ° of radiuses on specific position two measuring points letter
Number and average, the influence both after can most significantly eliminating.From being construed to for pile body vibration angle, in building solid pile stake
Body surface face taps, and not only creates the axisymmetric vibration shape, and produce the nonaxisymmetrical vibration shape.When simultaneously acquisition and beating point
Place radius is at 45 ° and 135 ° of radiuses on the signal of specific position and average, can most significantly eliminate the non-axis symmetry vibration shape
It influences.
Fig. 5 is concrete longitudinal wave velocity 4050m/s, Poisson's ratio 0.28, stake diameter 2.9m, the long 25m of stake, load pulsewidth 1.6ms
Under the conditions of, a kind of low strain dynamic two-speed signal averaging detection method of building solid pile of the present invention is in the arbitrary radius in stake top face
Tapped at 0.75R, with beating point where radius is at 45 ° and 135 ° of radiuses on the low strain dynamic two-speed of the places 0.53R sampling be averaged
Signal and the prior art tap at stake top surface midpoint, the time-history curves comparison diagram away from sampled signal at 2/3 radius of pile center.
Fig. 5 shows compared with sampling plan as defined in existing method, the interference signal in two-speed average signal proposed by the present invention
It is obviously reduced.
Due to a kind of knot of the low strain dynamic two-speed signal averaging detection method of building solid pile shown in Fig. 2 of the present invention
In structure schematic diagram, structure is symmetrical with the vertical section where beating point and stake midpoint line, so, shown in scheme shown in Fig. 2 and Fig. 6
The testing result of scheme is consistent, that is, Fig. 6 is the equivalent schematic of structural schematic diagram shown in Fig. 2, and related content is no longer superfluous herein
It states.
It, can further will be shown in Fig. 2 further, since structure is symmetrical with the vertical section where beating point and stake midpoint line
Structural schematic diagram and same along the vertical section by diameter where beating point with two measuring points of equivalent schematic shown in fig. 6
When do mirror image, the test result that the measuring point after mirror image combines and Fig. 2 and Fig. 6 are equivalent.So in real work, and in reality
Corresponding measuring point is tapped at the arbitrary point on heart stake top surface is disposed with 4 kinds of combinations, i.e. Fig. 2 and measuring point cloth shown in fig. 6
It sets combination and the two does the point layout combination after mirror image.
Embodiment 3
Fig. 7 is a kind of alternative solution knot of the low strain dynamic two-speed signal averaging detection method of building solid pile of the present invention
Structure schematic diagram.In the present embodiment, building solid pile is for real section circle stake.Specially：
Under the conditions of known to pile concrete Poisson's ratio, exciting device 200 is on the stake top surface of building solid pile 100
Eccentric hammer action is generated at (0.67-0.5 υ) R on arbitrary radius, wherein υ is pile concrete Poisson's ratio, and R is foundation pile half
Diameter；Under conditions of pile concrete Poisson's ratio is unknown, exciting device 200 is arbitrary on the stake top surface of building solid pile 100
Position generates eccentric hammer action at 2/3 of steel reinforcement cage radius on radius.On the stake top surface of building solid pile 100, with
Radius where beating point is vertical diametrically, away within the scope of each 0.15R of pile center or so, in the range of total 0.3R length, installs
At least one signal pickup assembly 300 is as the measuring point to building solid pile pile body；At the signal pickup assembly 300 and information
Reason device 400 is connected, and information processing unit 400 is low strain integrity testing instrument, and using one velocity pattern.
Specific percussion is consistent with sampling step with existing method, and details are not described herein again.
It is alternative solution structural schematic diagram shown in Fig. 7 in concrete longitudinal wave velocity 4050m/ also referring to Fig. 8, Fig. 8
S, under the conditions of Poisson's ratio 0.28, stake diameter 2.9m, the long 25m of stake, load pulsewidth 1.6ms, at the 0.53R of the arbitrary radius in stake top surface
Tap, it is vertical with radius where beating point diametrically, away from stake midpoint 0R (stake midpoint), 0.05R, 0.1R, 0.15R sampling
Low strain dynamic signal time-history curves contrast schematic diagram；Wherein, R is radius, and 0.53R is that Poisson's ratio 0.28 is updated to (0.67-
0.5 υ) the obtained beating positions of R；Fig. 8 shows, alternative solution shown in Fig. 8 provided by the invention, when with beating point where half
Diameter is vertical, and diametrically away from received signal within the scope of each 0.15R of pile center or so, the difference of their time-history curves is smaller,
It is approximate consistent to test effect.Wherein, R is foundation pile radius.
It is long in concrete longitudinal wave velocity 4050m/s, Poisson's ratio 0.28, stake diameter 2.9m, stake also referring to Fig. 9, Fig. 9
It is eccentric at the 0.53R of the arbitrary radius of stake top to tap under the conditions of 25m, load pulsewidth 1.6ms, alternative structure signal shown in Fig. 7
The two-speed average signal of signal and structural schematic diagram shown in Fig. 2 that figure is acquired at stake midpoint sampled at 0.53R
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 that the two-speed method of average and its alternative solution test effect proposed by the present invention is close, but two-speed is average
The sample effect of method is slightly better than alternative solution.
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 arbitrary point tap, the corresponding two specific measuring points of stake top acquisition surface two-speed signal curve and averagely obtain one
Single signal curve.By signal it is average come eliminate result from the three-dimensional interference signal of tapping areas and with along pile body
The eccentric moment shearing wave that column is propagated, to help more accurately to judge pile body architecture quality and the stake bottom of building pile body
Integrality.
It should be pointed out that signal acquisition point allows have certain model with 45 ° and 135 ° of beating point angulation in the present invention
The offset enclosed, the position of signal acquisition point on a radius allow have a certain range of offset, the beating point given by alternative solution
Position allows have a certain range of offset.
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 rectangular and polygonal solid stake, as long as that is, using the low strain dynamic two-speed signal averaging detection side of the present invention
Method belongs to design of the invention come the building solid pile detected.It is provided by the present invention for the other examples not provided
Device is identical, and the technique effect of realization principle and generation is similar with preceding method embodiment, to briefly describe, embodiment of the method
Part does not refer to place, can refer to corresponding contents in preceding method embodiment.
Flow chart and block diagram in attached drawing show the system, method and computer journey of multiple embodiments according to the present invention
The architecture, function and operation in the cards of sequence product.In this regard, each box in flowchart or block diagram can generation
A part for one module, section or code of table, a part for the module, section or code are used for comprising one or more
The executable instruction of logic function as defined in realizing.It should also be noted that in some implementations as replacements, being marked in box
Function can also occur in a different order than that indicated in the drawings.For example, two continuous boxes can essentially be basic
It is performed in parallel, they can also be executed in the opposite order sometimes, this is depended on the functions involved.It is also noted that
The combination of each box in block diagram and or flow chart and the box in block diagram and or flow chart can be used and execute regulation
Function or the dedicated hardware based system of action realize, or can be using a combination of dedicated hardware and computer instructions
To realize.
In several embodiments provided herein, it should be understood that disclosed mthods, systems and devices, it can be with
It realizes by another way.The apparatus embodiments described above are merely exemplary, for example, the division of the module, only
Only a kind of division of logic function, formula that in actual implementation, there may be another division manner, in another example, multiple module or components can be with
In conjunction with or be desirably integrated into another system, or some features can be ignored or not executed.Another point, it is shown or discussed
Mutual coupling, direct-coupling or communication connection can be indirect coupling by some communication interfaces, device or unit
It closes or communicates to connect, can be electrical, machinery or other forms.
Several embodiments of the invention above described embodiment only expresses, the description thereof is more specific and detailed, but simultaneously
Cannot the limitation to the scope of the claims of the present invention therefore 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, various modifications and improvements can be made, these belong to the guarantor of the present invention
Protect range.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (9)
1. the low strain dynamic two-speed signal averaging detection method of building solid pile, the low strain dynamic two-speed of the building solid pile
Signal averaging detection method is applied to building solid pile pile body, which is characterized in that the method comprising the steps of：
Beating point is set on building solid stake top surface, wherein beating point is located at the arbitrary point on stake top surface, including stake
Center；
Under the conditions of known to pile concrete Poisson's ratio, on the solid stake top surface of building, with radius where beating point at
Two signal pickup assemblies are installed at (0.67-0.5 υ) R on 45 ° and 135 ° of two radiuses to be used as to building solid pile stake
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 is unknown, on the solid stake top surface of building, with radius where beating point at
Position is installed two signal pickup assemblies and is used as to building at 2/3 of steel reinforcement cage radius on 45 ° and 135 ° of two radiuses
The measuring point of solid pile pile body；
When receiving the hammer action in beating point, while obtaining the measuring point signal from each signal pickup assembly and obtaining
Include the two-speed test curve of each measuring point signal；
Two-speed curve is averaging processing to obtain the testing result to the building solid pile pile body.
2. the low strain dynamic two-speed signal averaging detection method of building solid pile according to claim 1, feature exist
In the building solid pile is specially solid circles foundation pile.
3. the low strain dynamic two-speed signal averaging detection method of building solid pile according to claim 1, feature exist
In the hammer action is hammered into shape by power or power stick carries out vertical tap and generates.
4. the low strain dynamic two-speed signal averaging detection method of building solid pile according to claim 1, feature exist
In the signal pickup assembly is sensor.
5. the low strain dynamic two-speed signal averaging detection method of building solid pile according to claim 1, feature exist
In the signal pickup assembly is pasted onto the solid stake top surface of the building by glue, butter or plasticine.
6. the low strain dynamic two-speed signal averaging detection method of building solid pile according to claim 1, feature exist
In the signal pickup assembly is connected with the information processing unit that the signal acquired to signal pickup assembly is handled.
7. the low strain dynamic two-speed signal averaging detection method of building solid pile according to claim 6, feature exist
In described information processing unit is specially the low strain integrity testing instrument with two-speed pattern.
8. the low strain dynamic two-speed signal averaging detection method of building solid pile according to claim 1, feature exist
In, step " when receiving the hammer action in beating point, at the same obtain measuring point signal from each signal pickup assembly and
Obtain including the two-speed test curve of each measuring point signal " be specially：
At signal pickup assembly receives the information being connected with signal pickup assembly when a beat for beating point is acted
Reason device is triggered, and information processing unit is obtained and recorded from two signals positioned at the solid stake top surface of building simultaneously
The measuring point signal of harvester simultaneously obtains corresponding two-speed test curve.
9. the low strain dynamic two-speed signal averaging detection method of building solid pile according to claim 1 or 6, special
Sign is that step " two-speed curve is averaging processing to obtain the testing result to the building solid pile pile body " is specific
For：
Signal averaging is carried out to the two-speed signal obtained by information processing unit, generates one single rate curve.
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| CN201610717737.4A CN106320396B (en) | 2016-08-24 | 2016-08-24 | The low strain dynamic two-speed signal averaging detection method of building solid pile |
| CN201810882446.XA CN108930295B (en) | 2016-08-24 | 2016-08-24 | Low-strain eccentric knocking single-point sampling method for foundation pile |
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| CN107142977B (en) * | 2017-07-10 | 2018-10-09 | 荣垂强 | Low strain dynamic two-speed signal averaging detection method under the percussion of building foundation center |
| 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 |
| CN109098215B (en) * | 2018-08-23 | 2020-09-22 | 重庆大学 | Low-strain detection method for pile foundation |
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| JP2944515B2 (en) * | 1996-06-26 | 1999-09-06 | 株式会社青木建設 | Shape diagnosis method for natural structures |
| 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 |
| CN102877490B (en) * | 2012-09-18 | 2014-06-11 | 河海大学 | Method for detecting quality of large-diameter tubular pile at low strain |
| 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 |
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