CN107142977B - Low strain dynamic two-speed signal averaging detection method under the percussion of building foundation center - Google Patents
Low strain dynamic two-speed signal averaging detection method under the percussion of building foundation center Download PDFInfo
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- CN107142977B CN107142977B CN201710557748.5A CN201710557748A CN107142977B CN 107142977 B CN107142977 B CN 107142977B CN 201710557748 A CN201710557748 A CN 201710557748A CN 107142977 B CN107142977 B CN 107142977B
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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
Abstract
The present invention proposes the low strain dynamic two-speed signal averaging detection method under the percussion of building foundation center, including：In building foundation stake top centre of surface point, beating point is set；In the case of under the conditions of known to the pile concrete Poisson's ratio of the building foundation and unknown, measuring point is set；When beating point executes hammer action, while obtaining the measuring point signal from each signal pickup assembly and obtaining including the two-speed test curve of each measuring point signal；The two-speed test curve is averaging processing to obtain the testing result to the building foundation pile body integrity.The scheme of the embodiment of the present invention, pass through the average treatment to two-speed signal, obtained average signal is a single signal curve that can substantially eliminate stake top face three-dimensional interference signal, the range of choice of measuring point and test signal quality is improved when it expands building foundation low strain integrity testing, the integrality for more accurately judging the solid stake body of building can be helped.
Description
Technical field
The present invention relates to building analyte detection field, more particularly to the low strain dynamic two-speed under building foundation center taps is believed
Number average detected method.
Background technology
Existing common the low of building filled circles stake should detect change method, using the wink for applying low energy on stake top surface
State taps, and the shock wave for tapping generation is propagated downwards along pile body, generates reflection when encountering medium side or the stake bottom of impedance variations, instead
The single probe that ejected wave is installed in a certain position in stake top surface radius receives, and judges pile body according to the characteristics of signals of back wave
Quality.
It is had the following problems in the low strain integrity testing detection scheme of above-mentioned existing solid circles foundation pile：
The method of sampling is single, and only a kind of single probe by near a certain position of foundation pile radius samples, and this kind
The signal quality of scheme is not high.
Invention content
For the defects in the prior art, the present invention proposes the low strain dynamic double speed under a kind of building foundation center taps
Spend signal averaging detection method, in this way, when can help to expand building foundation low strain integrity testing measuring point range of choice
And test signal quality is improved, to more accurately judge the integrality of the pile body of building foundation.
Specifically, the present invention proposes embodiment in detail below：
The embodiment of the present invention proposes the low strain dynamic two-speed signal averaging detection method under building foundation center taps,
Including：
In building foundation stake top centre of surface point, beating point is set；
Under the conditions of known to the pile concrete Poisson's ratio of the building foundation, in the stake top of the building foundation
In surface radius, the distance difference at the both sides at (0.67-0.5 υ) R, with (0.67-0.5 υ) R is less than the two of the first preset value
A signal pickup assembly is respectively set as the measuring point to the building foundation in point, wherein υ is pile concrete Poisson
Than R is foundation pile radius；
Under conditions of pile concrete Poisson's ratio is unknown, in the stake top surface radius of the building foundation, reinforcing bar
Distance difference at both sides at the 2/3 of cage radius, with the 2/3 of steel reinforcement cage radius be less than the second preset value 2 points are respectively set
One signal pickup assembly is as the measuring point to the building foundation；
When beating point executes hammer action, while obtaining the measuring point signal from each signal pickup assembly and obtaining
Include the two-speed test curve of each measuring point signal；
The two-speed test curve is averaging processing to obtain the detection to the building foundation pile body integrity
As a result.
In a specific embodiment, the building foundation is specially solid circles foundation pile.
In a specific embodiment, the hammer action is hammered into shape specifically by power or power stick is vertically tapped.
In a specific embodiment, the signal pickup assembly is specially probe or sensor.
In a specific embodiment, the signal pickup assembly is pasted onto the building foundation by stickum
Stake top surface
In a specific embodiment, the stickum includes：Glue, butter or plasticine.
In a specific embodiment, the signal pickup assembly, which is connected with, acquires the signal pickup assembly
The information processing unit that signal is handled.
In a specific embodiment, described information processing unit is specially the low strain integrity testing with two-speed pattern
Instrument.
In a specific embodiment, described " when beating point executes hammer action, while to obtain and coming from each letter
The measuring point signal of number harvester and obtain the two-speed test curve for including each measuring point signal " include：
When the signal pickup assembly receives the signal caused by the beat action of beating point, triggering and institute
State the information processing unit that signal pickup assembly is connected；
It is obtained and is recorded from positioned at the stake top surface of the building foundation simultaneously by described information processing unit
The measuring point signal of two signal pickup assemblies and the two-speed test curve for obtaining including each measuring point signal.
In a specific embodiment, described " the two-speed test curve to be averaging processing to obtain to described
The testing result of building foundation pile body integrity " includes：
Signal averaging processing is carried out to the two-speed signal obtained by information processing unit, to generate a single speed
It writes music line.
With this, the embodiment of the present invention proposes the low strain dynamic two-speed signal averaging detection under building foundation center taps
Method, including：In building foundation stake top centre of surface point, beating point is set；It is moored in the pile concrete of the building foundation
Under the conditions of pine is than known to, in the stake top surface radius of the building foundation, the both sides at (0.67-0.5 υ) R, with
Distance difference at (0.67-0.5 υ) R, which is less than 2 points of the first preset value a signal pickup assembly is respectively set, to be used as to institute
State the measuring point of building foundation, wherein υ is pile concrete Poisson's ratio, and R is foundation pile radius；Pile concrete Poisson's ratio not
Under conditions of knowing, in the stake top surface radius of the building foundation, steel reinforcement cage radius 2/3 at both sides, with steel reinforcement cage
Distance difference at the 2/3 of radius is less than 2 points of the second preset value and a signal pickup assembly is respectively set as being built to described
Build the measuring point of object foundation pile.When beating point executes hammer action, while obtaining the measuring point letter from each signal pickup assembly
Number and obtain including the two-speed test curve of each measuring point signal；The two-speed test curve is averaging processing to obtain
To the testing result of the building foundation pile body integrity.The scheme of the embodiment of the present invention, by being put down to two-speed signal
It handles, obtained average signal is a single signal curve that can substantially eliminate stake top face three-dimensional interference signal, it expands
The range of choice of measuring point and test signal quality is improved when big building foundation low strain integrity testing, and can helped more accurate
Really judge the integrality of the solid stake body of building.
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 the stream of the low strain dynamic two-speed signal averaging detection method under a kind of building foundation center of the present invention taps
Journey schematic diagram；
Fig. 2 is the knot of the low strain dynamic two-speed signal averaging detection method under a kind of building foundation center of the present invention taps
Structure schematic diagram；
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,
The long 25m of stake, pile soil horizon shear wave velocity value range are 350m/s~1500m/s, and corresponding soil layer Poisson's ratio variation range is
Under the conditions of 0.36~0.25, load pulsewidth 1.6ms, at stake top centre of surface tap, on arbitrary radius at 0.53R two
At side, with 0.53R at approximately equidistant 0.39R and 0.67R sample actual measurement low strain dynamic two-speed signal averaging before and after when
Journey J curve effectJ 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, and is put down
Equal signal refer to by low strain dynamic two-speed signal respectively to two measuring point signals at 0.39R and 0.67R on the radius into
The signal that row averagely obtains, " average " specifically refers to two single-passes corresponding to synchronization on horizontal axis (time shaft or stake are long)
The numerical value (vertical velocity value) of the axis of ordinates of road (single-point) signal is averaged；
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,
The long 25m of stake, pile soil horizon shear wave velocity value range are 350m/s~1500m/s, and corresponding soil layer Poisson's ratio variation range is
Under the conditions of 0.36~0.25, load pulsewidth 1.6ms, at stake top centre of surface tap, on arbitrary radius at 0.53R two
At side, with 0.53R at approximately equidistant 0.30R and 0.75R sample actual measurement low strain dynamic two-speed signal averaging before and after when
Journey J curve effectJ 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, and is put down
Equal signal refer to by low strain dynamic two-speed signal respectively to two measuring point signals at 0.30R and 0.75R on the radius into
The signal that row averagely obtains, " average " specifically refers to two single-passes corresponding to synchronization on horizontal axis (time shaft or stake are long)
The numerical value (vertical velocity value) of the axis of ordinates of road (single-point) signal is averaged；
In other words, Fig. 4 be with the same foundation stakes of Fig. 3, but at 0.30R and 0.75R sample actual measurement low strain dynamic double speed
Spend the time-history curves effect diagram before and after signal averaging.
Main element symbol description：
100- solid circles section foundation pile；200- exciting devices (power is hammered into shape or power stick)；
300- signal pickup assemblies (probe or sensor)；400- information processing units (there is the low of two-speed pattern to answer
Become detector)
Specific implementation mode
Hereinafter, the various embodiments of the disclosure will be described more fully.The disclosure can have various embodiments, and
It can adjust and change wherein.It should be understood, however, that：There is no the various embodiments of the disclosure are limited to spy disclosed herein
Determine the intention of embodiment, but the disclosure should be interpreted as in the spirit and scope for covering the various embodiments for falling into the disclosure
All adjustment, equivalent and/or alternative.
Hereinafter, disclosed in the term " comprising " that can be used in the various embodiments of the disclosure or " may include " instruction
Function, operation or the presence of element, and do not limit the increase of one or more functions, operation or element.In addition, such as existing
Used in the various embodiments of the disclosure, term " comprising ", " having " and its cognate are meant only to indicate special characteristic, number
Word, step, operation, the combination of element, component or aforementioned item, and be understood not to exclude first one or more other
Feature, number, step, operation, the combination of element, component or aforementioned item presence or increase one or more features, number,
Step, the possibility of operation, the combination of element, component or aforementioned item.
In the various embodiments of the disclosure, it includes listing file names with to state "or" or " at least one of A or/and B "
Any combinations of word or all combinations.For example, statement " A or B " or " at least one of A or/and B " may include A, may include
B may include A and B both.
The statement (" first ", " second " etc.) used in the various embodiments of the disclosure can be modified in various implementations
Various constituent element in example, but respective sets can not be limited into element.For example, presented above be not intended to limit the suitable of the element
Sequence and/or importance.The purpose presented above for being only used for differentiating an element and other elements.For example, the first user fills
It sets and indicates different user device with second user device, although the two is all user apparatus.For example, not departing from each of the disclosure
In the case of the range of kind embodiment, first element is referred to alternatively as second element, and similarly, second element is also referred to as first
Element.
It should be noted that：It, can be by the first composition member if a constituent element ' attach ' to another constituent element by description
Part is directly connected to the second constituent element, and " connection " third can be formed between the first constituent element and the second constituent element
Element.On the contrary, when a constituent element " being directly connected to " is arrived another constituent element, it will be appreciated that in the first constituent element
And second third constituent element is not present between constituent element.
The term " user " used in the various embodiments of the disclosure, which may indicate that, to be used the people of electronic device or uses electricity
The device (for example, artificial intelligence electronic device) of sub-device.
The term used in the various embodiments of the disclosure is used only for the purpose of describing specific embodiments and not anticipates
In the various embodiments of the limitation disclosure.As used herein, singulative is intended to also include plural form, unless context is clear
Chu it is indicated otherwise.Unless otherwise defined, otherwise all terms (including technical terms and scientific terms) used herein have
There is meaning identical with the various normally understood meanings of embodiment one skilled in the art of the disclosure.The term
(term such as limited in the dictionary generally used) is to be interpreted as having and situational meaning in the related technical field
Identical meaning and the meaning that Utopian meaning or too formal will be interpreted as having, unless in the various of the disclosure
It is clearly defined in embodiment.
Embodiment 1
The embodiment of the present invention 1 discloses the low strain dynamic two-speed signal averaging detection side under building foundation center taps
Method, as shown in Figure 1, including：
Beating point is arranged in building foundation stake top centre of surface point in step 101；
Specifically, the beating point is located at building foundation stake top centre of surface, in one embodiment, the building
Foundation pile is specially solid circles foundation pile.
Step 102, known to the pile concrete Poisson's ratio of the building foundation under the conditions of, in the building base
In the stake top surface radius of stake, it is pre- that the distance difference at the both sides at (0.67-0.5 υ) R, with (0.67-0.5 υ) R is less than first
If, a signal pickup assembly is respectively set as the measuring point to the building foundation at 2 points of value, wherein υ is mixed for pile body
Solidifying soil Poisson's ratio, R are foundation pile radius；
Under conditions of pile concrete Poisson's ratio is unknown, in the stake top surface radius of the building foundation, reinforcing bar
Distance difference at both sides at the 2/3 of cage radius, with the 2/3 of steel reinforcement cage radius be less than the second preset value 2 points are respectively set
One signal pickup assembly is as the measuring point to the building foundation；
Specifically, under the conditions of known to the pile concrete Poisson's ratio of the building foundation, set two surveys
Point can be multipair measuring point, and each pair of measuring point (each pair of measuring point includes two measuring points) only needs to meet the stake in the building foundation
On top surface radius, the distance difference at the both sides at (0.67-0.5 υ) R, with (0.67-0.5 υ) R is less than the first preset value, tool
First preset value of body based on those skilled in the art thinks difference close to zero to be configured namely each right
Measuring point, which meets, is located at position both sides and this approximate equidistant condition at (0.67-0.5 υ) R, or is carried out according to field measurement effect
Setting.
Specifically, under the conditions of known to the pile concrete Poisson's ratio of the building foundation, with stake top surface radius
On (0.67-0.5 υ) R at as refer to datum mark, this be according to pile-soil model material and geometric parameter variation under it is a large amount of
The experience calculation expression being calculated, Practical Project verification show that the application effect of the calculating formula is preferable.
Specifically, under conditions of pile concrete Poisson's ratio is unknown, set two measuring points can be multipair measuring point,
Each pair of measuring point (each pair of measuring point includes two measuring points) only needs to meet in the stake top surface radius of building foundation, steel reinforcement cage half
Distance difference at both sides at the 2/3 of diameter, with the 2/3 of steel reinforcement cage radius is less than the second preset value, specific second preset value
Difference is thought close to zero based on those skilled in the art to be configured namely each pair of measuring point meets and be located at steel
Both sides and this approximate equidistant condition at 2/3 position of muscle cage radius, or be configured according to field measurement effect.
Specifically, under conditions of the pile concrete Poisson's ratio of the building foundation is unknown, with stake top surface radius
As referring to datum mark at the 2/3 of upper steel reinforcement cage radius, this is because common concrete Poisson's ratio variation range about 0.1~
Within 0.35, correspondingly, the variation range of (0.67-0.5 υ) R is between 0.5R~0.62R, it is contemplated that the concrete of steel reinforcement cage
Protective layer thickness, this variation range actually closer at the 2/3 of steel reinforcement cage radius, so, in pile concrete Poisson's ratio
Under conditions of unknown, steel reinforcement cage radius in building filled circles stake top surface radius 2/3 at both sides it is approximate equidistant
From 2 positions install two signal pickup assemblies as the measuring point to building filled circles stake.
Specifically, in one embodiment, the signal pickup assembly described in step 102 is two, and is pasted onto stake top
Surface is with two point positions of corresponding difference on Radius, but for full pile, it is contemplated that foundation pile and acts on stake top surface
The load of central point constitutes axial symmetry system, at this point, the installation site of two measuring points, which can be extended to, is located at (0.67-0.5 υ)
Justify in circular both sides, and at (0.67-0.5 υ) R or at the 2/3 of steel reinforcement cage radius at R or 2/3 place of steel reinforcement cage radius
On equal two circles of arc radius difference, that is, be located in two circles shown in dotted line in Fig. 2 (chain line) two
On any position.
The signal pickup assembly is pasted onto building foundation stake top surface by stickum；Wherein, described viscous
Property substance includes：Glue, butter or plasticine.
The signal pickup assembly is specially probe or sensor.
Step 103, when beating point execute hammer action when, while obtain from each signal pickup assembly measuring point letter
Number and obtain including the two-speed test curve of each measuring point signal；
The hammer action is hammered into shape specifically by power or power stick is vertically tapped.
The signal pickup assembly is connected at the information that the signal acquired to the signal pickup assembly is handled
Manage device；Described information processing unit is specially the low strain integrity testing instrument with two-speed pattern.
With this, in step 103 it is described " when beating point execute hammer action when, while obtain adopted from each signal
The measuring point signal of acquisition means and obtain the two-speed test curve for including each measuring point signal " include：
When the signal pickup assembly receives the signal caused by the beat action of beating point, triggering and institute
State the information processing unit that signal pickup assembly is connected；
It is obtained and is recorded from positioned at the stake top surface of the building foundation simultaneously by described information processing unit
The measuring point signal of two signal pickup assemblies and the two-speed test curve for obtaining including 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.The present invention's
In scheme, since two signal pickup assemblies are different at a distance from beating point, in order to ensure that Mintrop wave between each measuring point is incident
The accuracy of the phase difference of time difference and interference signal, it is necessary to using the low strain integrity testing instrument with two-speed pattern, and
It is sampled simultaneously under two-speed pattern.
Specifically, when receiving the beat action in beating point, by low strain integrity testing instrument, while two are obtained
The measuring point signal of signal pickup assembly and corresponding two-speed test curve is obtained, multiple two-speeds letters will be acquired by repeatedly tapping
Number.When executing signal preservation, a plurality of two-speed signal will be averaged into as a two-speed signal, i.e., when signal preserves, instrument
Device is according to the signal averaging that channel (or sensor) is that unit carries out, and in other words, when signal preserves, instrument is automatically by the same spy
The signal that head (or measuring point) obtains under multiple tap is averaged, and the purpose is to the repeatability of checking signal, stability, and
And eliminate secondary disturbances or human interference.
Step 104, the two-speed test curve is averaging processing to obtain it is complete to the building foundation pile body
The testing result of property.
In a specific embodiment, described in step 104 " is averaging processing the two-speed test curve
Obtain the testing result to the building foundation pile body integrity " include：
Signal averaging processing is carried out to the two-speed signal obtained by information processing unit, to generate a single speed
It writes music line.
It, can be at the signal processing interface of information processing unit low strain integrity testing instrument by two-speed in actual application scenarios
Two curves in signal are average, or by two-speed signal import in the mating signal analysis software of low strain integrity testing instrument into
Row signal averaging can also be exported in other data processing softwares and is averaged.It is average the result is that obtain one it is average after
Single rate curve.
Embodiment 2
Fig. 2 is that the structure of the low strain dynamic two-speed signal averaging detection method under building foundation center of the present invention taps is shown
It is intended to.In the present embodiment, building solid pile is solid circles foundation pile.
Exciting device 200 generates hammer action at the stake top centre of surface point of solid circles section foundation pile 100, in pile body
Under the conditions of concrete Poisson's ratio is known, on the arbitrary radius in stake top surface of the solid circles section foundation pile 100 of building,
Two signal pickup assemblies 300 are installed as to building in both sides at (0.67-0.5 υ) R, approximately equidistant 2 positions
The measuring point of filled circles stake, wherein υ is pile concrete Poisson's ratio, and R is foundation pile radius.Known to pile concrete Poisson's ratio
Under the conditions of, on the arbitrary radius in stake top surface of building filled circles stake, steel reinforcement cage radius 2/3 at both sides, it is approximate equidistant
From 2 positions install two signal pickup assemblies as the measuring point to building filled circles stake.Two of above-mentioned stickup probe
Measuring point and revocable two measuring points can be multipair two measuring points, they need to only meet positioned at on Radius, (0.67-
0.5 υ) position both sides and this approximate equidistant condition at R or at the 2/3 of steel reinforcement cage radius, for the complete of real section circle
Stake, it is contemplated that foundation pile and the load for acting on stake top centre of surface point constitute axial symmetry system, at this point, the installation of two measuring points
Position can be extended to the circular arc centered on pile center's point where above-mentioned two point position；Information processing unit 400 is
Low strain integrity testing instrument with two-speed pattern, test pattern is using two-speed pattern.
When exciting device 200 solid circles section foundation pile 100 stake top centre of surface point generate a beat action when,
By sensor and low strain integrity testing instrument, a two-speed test curve for including two measuring point signals can be obtained.When exciting fills
It sets when same point generates hammer action again, obtains the two-speed signal that Article 2 includes two rate curves, repeatedly tap
Multiple two-speed signals will be acquired, when signal preserves, the signal averaging that instrument is carried out according to channel (or sensor) for unit,
We will obtain a two-speed signal for including two test curves.Subsequently, in information processing unit low strain integrity testing instrument
Two curves in two-speed signal are averaged by signal processing interface, or two-speed signal is imported and is matched with low strain integrity testing instrument
Signal averaging is carried out in the signal analysis software of set, can also be exported in other data processing softwares and is averaged.Average
The result is that the single rate curve after obtaining one averagely.
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, stake diameter 2.9m, the long 25m of stake, pile soil horizon shear wave velocity value range are 350m/s~1500m/s, corresponding soil layer Poisson
It is 0.36~0.25 than variation range, under the conditions of load pulsewidth 1.6ms, is tapped at stake top centre of surface, on arbitrary radius
Both sides at 0.53R are put down with the actual measurement low strain dynamic two-speed signal sampled at approximately equidistant 0.39R and 0.67R at 0.53R
Front and back time-history curves effect diagram.Wherein, 0.53R is to be adopted what Poisson's ratio 0.28 was updated to that (0.67-0.5 υ) R obtains
Sample position, average signal refer to by low strain dynamic two-speed signal respectively to two measuring points at 0.39R and 0.67R on the radius
The signal of signal averagely obtain, " average " specifically refers to will be corresponding to synchronization on horizontal axis (time shaft or stake are long)
The numerical value (vertical velocity value) of the axis of ordinates of two single channel (single-point) signals is averaged.
After Fig. 3 shows that two single point signals on the radius at 0.39R and 0.67R are average, the three-dimensional in average signal is dry
It disturbs signal to be obviously reduced, therefore, the two-speed method of average proposed through the invention can significantly eliminate three-dimensional interference signal.And
And due at 0.67R position be sample that specification is recommended, this illustrates the matter of two-speed method of average signal that the present invention obtains
Amount is better than the obtained test signal of the method for sampling by existing specification, to which two-speed average signal can help more accurately
Judge the integrality of the solid stake body of building.
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, stake diameter 2.9m, the long 25m of stake, pile soil horizon shear wave velocity value range are 350m/s~1500m/s, corresponding soil layer Poisson
It is 0.36~0.25 than variation range, under the conditions of load pulsewidth 1.6ms, is tapped at stake top centre of surface, on arbitrary radius
Both sides at 0.53R are put down with the actual measurement low strain dynamic two-speed signal sampled at approximately equidistant 0.30R and 0.75R at 0.53R
Front and back time-history curves effect diagram.Wherein, 0.53R is to be adopted what Poisson's ratio 0.28 was updated to that (0.67-0.5 υ) R obtains
Sample position, average signal refer to by low strain dynamic two-speed signal respectively to two measuring points at 0.30R and 0.75R on the radius
The signal of signal averagely obtain, " average " specifically refers to will be corresponding to synchronization on horizontal axis (time shaft or stake are long)
The numerical value (vertical velocity value) of the axis of ordinates of two single channel (single-point) signals is averaged.
In other words, Fig. 4 be with the same foundation stakes of Fig. 3, but at 0.30R and 0.75R sample actual measurement low strain dynamic double speed
Spend the actual measurement time-history curves effect diagram before and after signal averaging.
After Fig. 4 shows that two single point signals on the radius at 0.30R and 0.75R are average, the three-dimensional in average signal is dry
It disturbs signal to be obviously reduced, this, which again illustrates the two-speed method of average proposed through the invention, can significantly eliminate three-dimensional interference
Signal, moreover, further comparison diagram 3 with the average signal in Fig. 4 it is found that the three-dimensional interference signal intensity of the two is suitable.Due to
The building foundation of the present invention is in the low strain dynamic two-speed signal averaging detection method under pile center taps, mount message acquisition
Two measuring points of device, radially and revocable two measuring points, they can be multipair two measuring points, so, the present invention
The two-speed method of average of proposition can significantly expand the range of choice of measuring point under the premise of ensureing sample effect.
With this, the embodiment of the present invention proposes the low strain dynamic two-speed signal averaging detection under building foundation center taps
Method, including：In building foundation stake top centre of surface point, beating point is set；It is moored in the pile concrete of the building foundation
Under the conditions of pine is than known to, in the stake top surface radius of the building foundation, the both sides at (0.67-0.5 υ) R, with
Distance difference at (0.67-0.5 υ) R, which is less than 2 points of the first preset value a signal pickup assembly is respectively set, to be used as to institute
State the measuring point of building foundation, wherein υ is pile concrete Poisson's ratio, and R is foundation pile radius；Pile concrete Poisson's ratio not
Under conditions of knowing, in the stake top surface radius of the building foundation, steel reinforcement cage radius 2/3 at both sides, with steel reinforcement cage
Distance difference at the 2/3 of radius is less than 2 points of the second preset value and a signal pickup assembly is respectively set as being built to described
Build the measuring point of object foundation pile.When beating point executes hammer action, while obtaining the measuring point letter from each signal pickup assembly
Number and obtain including the two-speed test curve of each measuring point signal；The two-speed test curve is averaging processing to obtain
To the testing result of the building foundation pile body integrity.The scheme of the embodiment of the present invention, by being put down to two-speed signal
It handles, obtained average signal is a single signal curve that can substantially eliminate stake top face three-dimensional interference signal, it expands
The range of choice of measuring point and test signal quality is improved when big building foundation low strain integrity testing, and can helped more accurate
Really judge the integrality of the solid stake body of building.
It will be appreciated by those skilled in the art that the accompanying drawings are only schematic diagrams of a preferred implementation scenario, module in attached drawing or
Flow is not necessarily implemented necessary to the present invention.
It will be appreciated by those skilled in the art that the module in device in implement scene can be described according to implement scene into
Row is distributed in the device of implement scene, can also be carried out respective change and is located at the one or more dresses for being different from this implement scene
In setting.The module of above-mentioned implement scene can be merged into a module, can also be further split into multiple submodule.
Aforementioned present invention serial number is for illustration only, does not represent the quality of implement scene.
Disclosed above is only several specific implementation scenes of the present invention, and still, the present invention is not limited to this, Ren Heben
What the technical staff in field can think variation should all fall into protection scope of the present invention.
Claims (10)
1. the low strain dynamic two-speed signal averaging detection method under the percussion of building foundation center, which is characterized in that including：
In building foundation stake top centre of surface point, beating point is set；
Under the conditions of known to the pile concrete Poisson's ratio of the building foundation, on the stake top surface of the building foundation
On any one radius, the distance difference at the both sides at (0.67-0.5 υ) R, with (0.67-0.5 υ) R is less than the first preset value
2 points a signal pickup assembly is respectively set as the measuring point to the building foundation, wherein υ be pile concrete pool
Loose ratio, R are foundation pile radius；
Under conditions of pile concrete Poisson's ratio is unknown, on the radius of any one of the stake top surface of the building foundation,
Distance difference at both sides at the 2/3 of steel reinforcement cage radius, with the 2/3 of steel reinforcement cage radius is less than 2 points of difference of the second preset value
One signal pickup assembly is set as the measuring point to the building foundation；
When beating point executes hammer action, while obtaining the measuring point signal from each signal pickup assembly and being included
The two-speed test curve of each measuring point signal；
The two-speed test curve is averaging processing to obtain the testing result to the building foundation pile body integrity.
2. the low strain dynamic two-speed signal averaging detection method under building foundation center percussion as described in claim 1,
It is characterized in that, the building foundation is specially solid circles foundation pile.
3. the low strain dynamic two-speed signal averaging detection method under building foundation center percussion as described in claim 1,
It is characterized in that, the hammer action is hammered into shape specifically by power or power stick is vertically tapped.
4. the low strain dynamic two-speed signal averaging detection method under building foundation center percussion as described in claim 1,
It is characterized in that, the signal pickup assembly is specially probe or sensor.
5. the low strain dynamic two-speed signal averaging detection method under building foundation center percussion as described in claim 1 or 4,
It is characterized in that, the signal pickup assembly is pasted onto building foundation stake top surface by stickum.
6. the low strain dynamic two-speed signal averaging detection method under building foundation center percussion as claimed in claim 5,
It is characterized in that, the stickum includes：Glue, butter or plasticine.
7. the low strain dynamic two-speed signal averaging detection method under building foundation center percussion as described in claim 1,
It is characterized in that, the signal pickup assembly is connected at the information that the signal acquired to the signal pickup assembly is handled
Manage device.
8. the low strain dynamic two-speed signal averaging detection method under building foundation center percussion as claimed in claim 7,
It is characterized in that, described information processing unit is specially the low strain integrity testing instrument with two-speed pattern.
9. the low strain dynamic two-speed signal averaging detection method under building foundation center percussion as described in claim 1,
It is characterized in that, it is described " when beating point executes hammer action, while to obtain the measuring point signal from each signal pickup assembly
And obtain the two-speed test curve for including each measuring point signal " include：
When the signal pickup assembly receives the signal caused by the beat action of beating point, triggering and the letter
The information processing unit that number harvester is connected；
It is obtained and is recorded from two letters positioned at building foundation stake top surface simultaneously by described information processing unit
The measuring point signal of number harvester and the two-speed test curve for obtaining including each measuring point signal.
10. the low strain dynamic two-speed signal averaging detection side under the percussion of building foundation center as described in claim 1 or 9
Method, which is characterized in that described " the two-speed test curve to be averaging processing to obtain complete to the building foundation pile body
The testing result of whole property " includes：
Signal averaging processing is carried out to the two-speed signal obtained by information processing unit, it is bent to generate a single speed
Line.
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| CN102127917A (en) * | 2010-12-03 | 2011-07-20 | 中国民航大学 | Low-strain testing device for detecting integrity of ultralong bored concrete pile |
| CN106088168B (en) * | 2016-07-18 | 2020-10-16 | 荣垂强 | Low-strain double-speed signal average detection method for building pile body |
| CN106320395B (en) * | 2016-08-24 | 2018-08-17 | 荣垂强 | The low strain dynamic two-speed signal averaging detection method of building hollow pile |
| CN106320396B (en) * | 2016-08-24 | 2018-09-14 | 荣垂强 | The low strain dynamic two-speed signal averaging detection method of building solid pile |
| CN106677232B (en) * | 2016-12-30 | 2018-12-18 | 华中科技大学 | Wave excitation capturing analysis method is cut in a kind of torsion for pile detection |
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