CN113310460A - High-precision measuring method for concrete pouring surface mark of bored pile - Google Patents
High-precision measuring method for concrete pouring surface mark of bored pile Download PDFInfo
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- CN113310460A CN113310460A CN202110534547.XA CN202110534547A CN113310460A CN 113310460 A CN113310460 A CN 113310460A CN 202110534547 A CN202110534547 A CN 202110534547A CN 113310460 A CN113310460 A CN 113310460A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C5/00—Measuring height; Measuring distances transverse to line of sight; Levelling between separated points; Surveyors' levels
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
- G01S15/02—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems using reflection of acoustic waves
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- G01S15/08—Systems for measuring distance only
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Abstract
The invention discloses a method for measuring the height and the precision of a concrete pouring surface mark of a bored pile, which comprises an ultrasonic probe fixing device, an ultrasonic measurement and analysis device, a measurement means and a data analysis and processing technology. The ultrasonic measuring and analyzing device is tied on a concrete guide pipe by an ultrasonic probe fixing device, concrete is poured into the cast-in-situ bored pile from the concrete guide pipe according to a standard construction procedure, the liquid level in the hole rises along with the concrete, the ultrasonic probe measures different ultrasonic signals along with different media, when the ultrasonic probe detects the concrete, the ultrasonic signal processor gives an early warning according to the waveform and the amplitude as criteria, and the concrete cast-in-situ height detection early warning of the concrete cast-in-situ bored pile in engineering is realized. According to the invention, the cast-in-situ bored pile is layered by an ultrasonic method, so that the problems of inaccurate and asynchronous measurement of the traditional measuring device can be solved, the engineering construction efficiency can be improved, the cost is saved, and the method is suitable for wide popularization and application.
Description
Technical Field
The invention relates to the technical field of construction and civil engineering construction, in particular to a method for measuring a concrete pouring surface mark of a bored pile with high precision.
Background
In recent years, with the continuous improvement of national economy, various houses, bridges and large wharfs are increasing. The cast-in-situ bored pile is one of the most commonly used foundation forms in the construction industry at present due to the advantages of wide applicable foundation range, construction noise, economic superiority and the like. As slurry and laitance exist above the concrete pouring surface in the pouring process of the cast-in-situ bored pile, the whole pouring process is invisible, people cannot determine the concrete pouring elevation, and the concrete pouring construction quality is difficult to guarantee. In order to solve the problem, the prior construction site mostly adopts super-irrigation construction, namely, the concrete pouring elevation exceeds the designed elevation, and a pile head is chiseled after the foundation pit is excavated. At present, the phenomenon of excessive concrete pouring is frequently seen, and as a result, a large amount of concrete materials are wasted, and the engineering cost is increased.
At present, in the construction of domestic cast-in-situ bored piles, a mode of hanging a weight by a measuring rope is mostly adopted, the elevation of a concrete pouring surface is judged by depending on the hand feeling of site constructors, but human factors, mud proportion, hole bottom sediment and the like all influence the accuracy of the measuring rope, the method has the characteristics of high subjectivity and randomness, and particularly, under the conditions of large thickness of a laitance layer and high laitance density, the method can cause huge measuring errors. Meanwhile, the measuring method can invisibly consume physical strength of workers and normal construction time, and the requirement of continuous pouring construction of the filling pile is difficult to meet. In order to make the best use of building materials, reduce the waste of materials and meet the actual requirements of the domestic engineering world, the invention provides the convenient method for measuring the concrete filling level of the cast-in-situ bored pile with high precision, which has high practical value.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a method for measuring the height of a concrete pouring surface of a cast-in-situ bored pile with high precision, which solves the problems of inaccurate measurement and inconvenient use of the existing device for measuring the height of the concrete pouring surface of the cast-in-situ bored pile.
In order to achieve the above purpose, the invention provides the following technical scheme: a high-precision measuring method for a concrete pouring surface mark of a bored pile comprises the following specific steps:
the method comprises the following steps: the measurement personnel enter the field after the permission of the field constructor, communicate with the field constructor about the notice, and carry out the field safety inspection;
step two: binding the drilling bored concrete pile concrete filling surface elevation high-precision detection device at the accurate position of the concrete guide pipe according to the construction requirement, wherein the elevation on the concrete guide pipe corresponding to the concrete filling surface design is designed when the accurate position is at the highest limit point of the concrete guide pipe;
step three: starting an ultrasonic detection device to monitor data, pouring concrete into the cast-in-situ bored pile from a concrete guide pipe according to a standard construction program, enabling the liquid level in the hole to rise along with the concrete guide pipe, measuring different ultrasonic signals by an ultrasonic probe along with different media, transmitting the ultrasonic signals to an ultrasonic signal processor WSD-3 digital sound wave instrument through a waterproof wear-resistant data line, processing and analyzing the signals by a programmed program, and distinguishing different medium layers;
step four: the method comprises the following steps that a measurer monitors the change of ultrasonic waveform data in real time, an ultrasonic waveform image and an ultrasonic amplitude value can be changed correspondingly along with the rise of liquid levels of different media, when an ultrasonic probe detects a concrete layer, a detection device can give out early warning, and the measurer lifts a concrete guide pipe to prompt a constructor;
step five: repeating the step four until the concrete guide pipe reaches the maximum limit positioning point, namely, the concrete filling surface height marking high-precision detection device of the bored pile is positioned at the designed height marking of the concrete filling surface, and reminding constructors to stop filling concrete by a measurer;
step six: a measurer analyzes the current measured ultrasonic data by utilizing a self-contained analysis program of the ultrasonic signal processor WSD-3 digital acoustic wave instrument, and can pull out the concrete guide pipe after confirming that the concrete filling surface elevation reaches the designed concrete filling surface elevation;
step seven: and (3) recovering the high-precision detection device for the concrete pouring surface mark of the bored pile, disassembling the ultrasonic transmitting probe and the ultrasonic receiving probe, cleaning and boxing.
Furthermore, the ultrasonic probe comprises a transmitting probe and a receiving probe, the transmitting probe and the receiving probe are connected with the digital sound wave instrument through communication lines, and the fixed distance between the transmitting probe and the receiving probe is 4 cm.
Furthermore, in the second step, the ultrasonic sensor is embedded on the ultrasonic probe fixing device, and the gap is filled with a water-stop polyurethane foam material, so that the functions of shock absorption, compression resistance and water isolation are achieved.
Furthermore, in the fourth step, technical training and education assessment are carried out on the measurement operators.
Furthermore, the ultrasonic detection device in the fifth step has an analysis program, which includes a threshold algorithm of a peak picking method, which is a discrimination value based on the trend of the ultrasonic waveform, and can establish an accurate, semi-empirical or purely empirical functional relationship with numerous characteristics of the current medium under a certain condition; the principle is that the calculation is carried out by a formula (1-1), namely, all peak values of the ultrasonic waveform effective time domain of the measuring point are distinguished and picked up, the peak values with absolute values larger than 1000mv and smaller than 8000mv are intercepted to participate in the calculation, the overrun amplitude values larger than 8000mv are all calculated according to 8000, all the picked peak values are multiplied by a square to be added and divided by the number of inflection points of the total picked peak values, and then the peak value picking threshold value is obtained by reducing in equal proportion:
in the formula: j-the jth inflection peak in this set of ultrasonic waveforms;
n is the total number of inflection point peaks in the ultrasonic wave pattern;
Uj-the voltage amplitude at the receiver of the jth knee peak in the set of ultrasonic waveforms;
f-the set of ultrasonic waveforms-the peak pickup threshold of the set of ultrasonic waveforms;
A1-a set of security parameters associated with the ultrasonic wave pattern;
furthermore, the ultrasonic detection device in the fifth step has an analysis program, which includes an ultrasonic smoothing coefficient algorithm, which is based on the discrimination value of the ultrasonic waveform trend, and can establish an accurate, semi-empirical or purely empirical functional relationship with numerous characteristics of the current medium under a certain condition; the principle is that the calculation is carried out through a formula (1-2), and a smooth coefficient algorithm is designed aiming at the change of the slope of the ultrasonic waveform, namely the voltage amplitude U of every three adjacent receiving endsi+1、Ui、Ui-1Calculating the difference value of the amplitude changes of two adjacent sections into a group, then accumulating the difference value and dividing the difference value by the total number to obtain the smoothing coefficient threshold value:
in the formula: i-the ith ultrasonic measurement point in the ultrasonic wave pattern;
m is the total number of ultrasonic measuring points in the group of ultrasonic wave modes;
Uithe voltage amplitude of the receiving end of the ith measuring point in the ultrasonic wave mode;
p-the smoothing coefficient threshold for the present set of ultrasonic waveforms;
A2-a set of security parameters associated with the ultrasonic wave pattern;
furthermore, the ultrasonic detection device in the fifth step has an analysis program, which includes an ultrasonic smoothing coefficient algorithm, which is based on the discrimination value of the ultrasonic waveform trend, and can establish an accurate, semi-empirical or purely empirical functional relationship with numerous characteristics of the current medium under a certain condition; the principle is that the calculation is carried out through a formula (1-3), namely all peak values of the ultrasonic waveform effective time domain of the measuring point are judged and picked up, the peak values with absolute values larger than 1000mv and smaller than 8000mv are intercepted to participate in the calculation, the over-limit amplitude values larger than 8000mv are all participated in the calculation according to 8000, all the picked-up peak values are multiplied by a square to be added and divided by the number of inflection points of the total picked-up peak values, and then the sum is reduced in equal proportion to obtain a peak value picking-up threshold value; voltage amplitude U of every three adjacent receiving endsi+1、Ui、Ui-1Calculating the difference value of the amplitude changes of two adjacent sections into a group, and then accumulating the difference value and dividing the sum by the total number to obtain a smoothing coefficient threshold value; and then adding the peak value picking threshold value and the weighted smoothing coefficient threshold value to obtain a peak value weighted smoothing coefficient threshold value:
in the formula: i-the ith ultrasonic measurement point in the ultrasonic wave pattern;
m is the total number of ultrasonic measuring points in the group of ultrasonic wave modes;
Uithe voltage amplitude of the receiving end of the ith measuring point in the ultrasonic wave mode;
j-the jth inflection peak in this set of ultrasonic waveforms;
n is the total number of inflection point peaks in the ultrasonic wave pattern;
Uj-the voltage amplitude at the receiver of the jth knee peak in the set of ultrasonic waveforms;
Fp-the set of ultrasonic waveforms-a peak weighted smoothing coefficient threshold for the set of ultrasonic waveforms;
A3-a set of security parameters associated with the ultrasonic wave pattern;
furthermore, the ultrasonic detection device in the fifth step has an analysis program, which includes a periodic pulse width threshold algorithm, which is a discrimination value based on the trend of ultrasonic waveforms, and under a certain condition, can establish an accurate, semi-empirical or purely empirical functional relationship with numerous characteristics of the current medium; the principle is that the calculation is carried out by a formula (1-4), namely all peak values of the ultrasonic waveform effective time domain of the measuring point are distinguished and picked up, the peak value with the absolute value larger than 1000mv and smaller than 8000mv is intercepted to participate in the calculation, the next peak value inflection point of the peak value inflection point is subtracted from the corresponding sound time of the peak value inflection point, the sound time difference corresponding to the adjacent peak value inflection point is added and divided by the number of the total picked peak value inflection points minus one, and then the equal proportion is reduced, so that the period pulse width threshold value can be obtained:
in the formula: j-the jth inflection peak in this set of ultrasonic waveforms;
n is the total number of inflection point peaks in the ultrasonic wave pattern;
Lj-when the jth inflection point in the set of ultrasonic waveforms corresponds to acoustic;
Uj-the voltage amplitude at the receiver of the jth knee peak in the set of ultrasonic waveforms;
t-period pulse width threshold of the ultrasonic wave pattern of the group;
A4-a set of security parameters associated with the ultrasonic wave pattern;
furthermore, different ultrasonic signals of different medium layers are measured by an ultrasonic method to layer the cast-in-situ bored pile, and the waveform and the amplitude are measured as criteria, so that the concrete casting height of the cast-in-situ bored pile can be measured in real time.
Furthermore, the device for detecting the elevation of the concrete pouring surface of the cast-in-situ bored pile is bound to the concrete guide pipe at an accurate position, and the concrete pouring surface corresponding to the concrete guide pipe is designed to be elevated when the accurate position is at the highest limit point of the concrete guide pipe.
Advantageous effects
The invention provides a device for measuring the height and the precision of a concrete pouring surface of a bored pile. The method has the following beneficial effects:
(1) the method for measuring the height of the cast-in-place concrete pouring surface of the bored pile can facilitate the installation and measurement of the cast-in-place concrete pouring surface height and precision measuring device, is convenient for the disassembly and reuse of the cast-in-place concrete pouring surface height and precision measuring device, and solves the problems that the traditional measuring device needs to hang a heavy object through a measuring rope, the measurement is not accurate, and the manual experience is excessively relied on.
(2) The device for measuring the concrete filling surface height of the cast-in-situ bored pile obtains related data of ultrasonic waves in slurry and concrete slurry based on the ultrasonic probe fixing device and the ultrasonic measurement analysis instrument, researches the propagation characteristics of the ultrasonic waves in the slurry and the concrete slurry medium according to the first arrival wave body time and the waveform characteristics of the ultrasonic waves, and stratifies the concrete slurry medium.
(3) And obtaining a threshold value through effective data analysis, and realizing the height detection and early warning of the concrete pouring surface of the concrete pouring pile in the engineering. The difficult problem of the unable real-time detection concrete of present ultra-deep drilling bored concrete pile fills the elevation is solved, promote engineering efficiency of construction, practice thrift the cost.
Drawings
FIG. 1 is a schematic view of a device for measuring the height and the accuracy of a concrete pouring surface of a bored pile according to the present invention;
FIG. 2 is a schematic structural view of an ultrasonic probe fixing device according to the present invention;
FIG. 3 is a schematic view of an ultrasonic measurement and analysis apparatus according to the present invention;
FIG. 4 is a schematic diagram of the first stage of elevation measurement of a concrete pouring surface of the cast-in-situ bored pile according to the present invention.
FIG. 5 is a schematic diagram of the second stage of measuring the elevation of the concrete pouring surface of the bored concrete pile according to the present invention.
FIG. 6 is a third stage schematic diagram of elevation measurement of a concrete cast-in-situ bored pile concrete slab of the present invention.
In the figure: 1. an ultrasonic emission probe; 2. an ultrasonic receiving probe; 3. a concrete conduit belt; 4. Fixing the probe package; 5. a wear resistant zipper; 6. the concrete guide pipe is fixed with a fastener; 7. buffering foam rubber; 8. a waterproof wear-resistant data line; 9. a concrete conduit; 10. a clear water layer; 11. a mud layer; 12. a concrete layer; 13. a device for detecting the height and the precision of a concrete pouring surface of a bored pile; 14. a construction site horizontal plane; 15. designing elevation of concrete pouring surface; 16. a WSD-3 digital sonic apparatus;
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-6, the present invention provides a measurement method: a high-precision measuring device for the concrete pouring surface elevation of a bored pile is used for identifying and detecting the elevation of the bored pile.
As shown in fig. 1, the device for measuring the height and the precision of the concrete pouring surface of the bored pile comprises an ultrasonic probe and an ultrasonic probe fixing device, wherein the ultrasonic probe fixing device is used for fixing an ultrasonic transmitting probe 1 and an ultrasonic receiving probe 2 on a concrete guide pipe 9; preferably, the distance between the ultrasonic transmitting probe 1 and the ultrasonic receiving probe 2 is 4cm, the ultrasonic transmitting probe 1 transmits ultrasonic signals, the ultrasonic signals are transmitted through different medium layers, and the ultrasonic receiving probe 2 receives the ultrasonic signals; preferably, the waterproof and wear-resistant data line 8 transmits ultrasonic signals to the digital sound wave instrument 16 of the ultrasonic signal processor WSD-3 in real time, the signals are processed and analyzed by a programmed program, different medium layers can be distinguished, and a synchronous prompt signal for the concrete pouring amount reaching the designed elevation is realized by setting a threshold value, so that constructors are reminded to control the concrete pouring amount, and the effects of saving cost, improving efficiency and reducing construction period are achieved.
As shown in fig. 2, the ultrasonic probe fixing device functions to fix the ultrasonic transmission probe 1 and the ultrasonic reception probe 2 to the concrete pipe 9; preferably, after the designed elevation 15 of the concrete filling surface is determined, the concrete conduit belt 3 is bound to the corresponding height of the concrete conduit 9, and the height of the corresponding position is the same as the difference between the designed elevation of the concrete filling surface and the horizontal plane of the construction site; preferably, the ultrasonic transmitting probe 1 and the ultrasonic receiving probe 2 are fixed by the fixed probe package 4, and the buffer foam rubber 7 is fixed at the same time; preferably, the abrasion-resistant zipper 5 ensures that the ultrasonic probe is convenient to disassemble and can be repeatedly used for multiple times; preferably, the buffer foam rubber 7 is used for protecting the ultrasonic transmitting probe 1 and the ultrasonic receiving probe 2, so that the extrusion and the impact on the ultrasonic probe in the concrete pouring process are relieved; preferably, the concrete guide pipe fixing buckle 6 ensures that the ultrasonic fixing device is convenient to disassemble and can be repeatedly used.
As shown in FIG. 3, the ultrasonic testing apparatus is divided into an ultrasonic probe with a frequency of 50khz and an ultrasonic signal processor model WSD-3 digital sound wave device 16.
As shown in fig. 4, after the hole cleaning operation is completed, the concrete guide pipe 9 is placed into the hole to measure the height of the concrete pouring surface of the bored pile, and in the first stage, the ultrasonic transmitting probe 1 and the ultrasonic receiving probe 2 are positioned in the clean water layer 10.
As shown in fig. 5, the concrete is poured, the liquid level in the hole rises, the mud layer 11 is slowly pushed by the concrete layer 12 to the height of the concrete pouring surface of the cast-in-situ bored pile at the height-marking precision detection device 13, and the height-marking measurement of the concrete pouring surface of the cast-in-situ bored pile is performed in a second stage, in which the ultrasonic transmitting probe 1 and the ultrasonic receiving probe 2 are located in the mud layer 11.
As shown in fig. 6, when the concrete pouring amount reaches the designed concrete pouring surface elevation 15, a third stage of measuring the concrete pouring surface elevation of the bored pile, in which the ultrasonic transmitting probe 1 and the ultrasonic receiving probe 2 are located in the concrete layer 12.
The working principle and the mode of the invention are as follows: the measurement personnel enter the field after the permission of the field constructor, communicate with the field constructor about the notice, and carry out the field safety inspection; binding a drilling bored concrete pile concrete filling surface elevation high-precision detection device at an accurate position of a concrete guide pipe according to construction requirements, wherein the corresponding position is the same as the difference between the designed elevation of the concrete filling surface and the horizontal plane of a construction site; starting an ultrasonic detection device to monitor data, pouring concrete into the cast-in-situ bored pile from a concrete guide pipe according to a standard construction program, enabling the liquid level in the hole to rise along with the concrete guide pipe, measuring different ultrasonic signals by an ultrasonic probe along with different media, transmitting the ultrasonic signals to an ultrasonic signal processor WSD-3 digital sound wave instrument through a waterproof wear-resistant data line, processing and analyzing the signals by a programmed program, and distinguishing different medium layers; survey crew real time monitoring ultrasonic wave waveform data changes, and along with different medium liquid level rises, ultrasonic wave oscillogram and ultrasonic amplitude can produce corresponding change, and when ultrasonic probe detected concrete layer, detection device can send the early warning, by survey crew to the suggestion constructor lift the concrete pipe. And (3) until the concrete guide pipe reaches the maximum limit positioning point, namely, the concrete filling surface height marking high-precision detection device of the bored pile is positioned at the designed height marking of the concrete filling surface, and a measurer prompts a constructor to stop filling concrete.
A measurer analyzes the current measured ultrasonic data by utilizing an analysis program of the ultrasonic signal processor WSD-3 digital acoustic wave instrument, and can pull out the concrete guide pipe after confirming that the concrete filling surface elevation reaches the designed concrete filling surface elevation. And (3) recovering the high-precision detection device for the concrete pouring surface mark of the bored pile, disassembling the ultrasonic transmitting probe and the ultrasonic receiving probe, cleaning and boxing.
The ultrasonic transmitting probe 1 and the ultrasonic receiving probe 2 are fixed at a distance of 4cm, ultrasonic signals are transmitted by the ultrasonic transmitting probe 1, are transmitted through different medium layers, and are received by the ultrasonic receiving probe 2; preferably, the waterproof and wear-resistant data line 8 transmits the ultrasonic signals to the digital sound wave instrument 16 of the ultrasonic signal processor WSD-3 in real time, the signals are processed and analyzed by a programmed program, different medium layers can be distinguished, and a synchronous prompt signal for the concrete pouring amount reaching the designed elevation is realized by setting a threshold value, so that constructors are reminded to control the concrete pouring amount, and the effects of saving cost, improving efficiency and reducing construction period are achieved; different ultrasonic signals of different medium layers are measured by an ultrasonic method to layer the cast-in-situ bored pile, and the waveform and the amplitude are measured as criteria, so that the concrete cast-in-situ height of the cast-in-situ bored pile can be measured accurately in real time; is suitable for wide popularization and application.
Example 1
The method comprises the following steps: the measurement personnel enter the field after the permission of the field constructor, communicate with the field constructor about the notice, and carry out the field safety inspection;
step two: binding the drilling bored concrete pile concrete filling surface elevation high-precision detection device at the accurate position of the concrete guide pipe according to the construction requirement, wherein the elevation on the concrete guide pipe corresponding to the concrete filling surface design is designed when the accurate position is at the highest limit point of the concrete guide pipe;
step three: starting an ultrasonic detection device to monitor data, pouring concrete into the cast-in-situ bored pile from a concrete guide pipe according to a standard construction program, enabling the liquid level in the hole to rise along with the concrete guide pipe, measuring different ultrasonic signals by an ultrasonic probe along with different media, transmitting the ultrasonic signals to an ultrasonic signal processor WSD-3 digital sound wave instrument through a waterproof wear-resistant data line, processing and analyzing the signals by a programmed program, and distinguishing different medium layers;
step four: survey crew real time monitoring ultrasonic wave waveform data changes, and along with different medium liquid level rises, ultrasonic wave oscillogram and ultrasonic amplitude can produce corresponding change, and when ultrasonic probe detected concrete layer, detection device can send the early warning, by survey crew to the suggestion constructor lift the concrete pipe.
Step five: and repeating the step four until the concrete guide pipe reaches the maximum limit position, namely that the device for detecting the height of the concrete filling surface of the bored concrete pile is positioned at the designed height of the concrete filling surface, and reminding constructors of stopping filling concrete by using measuring personnel.
Step six: a measurer analyzes the current measured ultrasonic data by utilizing an analysis program of the ultrasonic signal processor WSD-3 digital acoustic wave instrument, and can pull out the concrete guide pipe after confirming that the concrete filling surface elevation reaches the designed concrete filling surface elevation.
Step seven: and (3) recovering the high-precision detection device for the concrete pouring surface mark of the bored pile, disassembling the ultrasonic transmitting probe and the ultrasonic receiving probe, cleaning and boxing.
Furthermore, the ultrasonic probe comprises a transmitting probe and a receiving probe, the transmitting probe and the receiving probe are connected with the digital sound wave instrument through communication lines, and the fixed distance between the transmitting probe and the receiving probe is 4 cm.
Furthermore, in the second step, the ultrasonic sensor is embedded on the ultrasonic probe fixing device, and the gap is filled with a water-stop polyurethane foam material, so that the functions of shock absorption, compression resistance and water isolation are achieved.
Furthermore, in the fourth step, technical training and education assessment are carried out on the measurement operators.
Furthermore, in the fifth step, the ultrasonic detection device is provided with an analysis program, and can pick up each peak of the ultrasonic waveform diagram and process the peak in a data mode.
Furthermore, different ultrasonic signals of different medium layers are measured by an ultrasonic method to layer the cast-in-situ bored pile, and the waveform and the amplitude are measured as criteria, so that the concrete casting height of the cast-in-situ bored pile can be measured in real time.
Furthermore, the device for detecting the elevation of the concrete pouring surface of the cast-in-situ bored pile is bound at the accurate position of the concrete guide pipe, and the elevation of the concrete pouring surface corresponding to the concrete guide pipe is designed when the accurate position is at the highest limit point of the concrete guide pipe;
it is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation. The use of the phrase "comprising one of the elements does not exclude the presence of other like elements in the process, method, article, or apparatus that comprises the element.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. A high-precision measuring method for a concrete pouring surface mark of a bored pile is characterized by comprising the following specific measuring method steps: firstly, a measuring person enters the field after the permission of a field constructor, communicates with the field constructor about the notice, and carries out field safety inspection; binding the device for detecting the elevation of the concrete pouring surface of the bored pile at the accurate position of the concrete guide pipe according to the construction requirement, wherein the elevation of the concrete guide pipe corresponding to the concrete pouring surface is designed when the accurate position is at the highest limit point of the concrete guide pipe; thirdly, starting an ultrasonic detection device to monitor data, pouring concrete into the cast-in-situ bored pile from a concrete guide pipe according to a standard construction program, enabling the liquid level in the hole to rise, enabling an ultrasonic probe to measure different ultrasonic signals along with different media, transmitting the ultrasonic signals to an ultrasonic signal processor WSD-3 digital acoustic wave instrument through a waterproof wear-resistant data line, processing and analyzing the signals by a programmed program, and distinguishing different medium layers; step four, monitoring the change of ultrasonic waveform data in real time by measuring personnel, generating corresponding changes of an ultrasonic waveform image and an ultrasonic amplitude along with the rise of liquid levels of different media, sending an early warning by a detection device when the ultrasonic probe detects a concrete layer, and prompting the constructor to stop pouring concrete by the measuring personnel; fifthly, the measurer analyzes the current measured ultrasonic data by utilizing an own analysis program of the ultrasonic signal processor WSD-3 digital acoustic wave instrument, and can pull out the concrete guide pipe after confirming that the concrete filling surface elevation reaches the designed concrete filling surface elevation; and sixthly, recovering the high-precision detection device for the concrete filling surface of the cast-in-situ bored pile, disassembling the ultrasonic transmitting probe and the ultrasonic receiving probe, cleaning and boxing.
2. The method for measuring the cast-in-situ concrete grouting surface elevation of the bored pile according to claim 1, wherein the method comprises the following steps: the ultrasonic probe comprises a transmitting probe and a receiving probe, the transmitting probe and the receiving probe are connected with the digital sound wave instrument through communication lines, and the fixed distance between the transmitting probe and the receiving probe is 4 cm.
3. The method for measuring the cast-in-situ concrete grouting surface elevation of the bored pile according to claim 1, wherein the method comprises the following steps: and in the second step, the ultrasonic sensor is embedded on the belt, and the gap is filled with a water-stop polyurethane foam material, so that the functions of shock absorption, compression resistance and water isolation are achieved.
4. The method for measuring the cast-in-situ concrete grouting surface elevation of the bored pile according to claim 1, wherein the method comprises the following steps: and in the fourth step, technical training and education assessment are carried out on the measurement operators.
5. The method for measuring the cast-in-situ concrete grouting surface elevation of the bored pile according to claim 1, wherein the method comprises the following steps: in the fifth step, the ultrasonic detection device is provided with an analysis program, and can pick up each peak value of the ultrasonic oscillogram and carry out data processing.
The ultrasonic detection device in the fifth step is provided with an analysis program, comprises a peak value picking method threshold value algorithm, and is based on a discrimination value of ultrasonic wave shape trend, and can establish an accurate, semi-empirical or purely empirical function relation with numerous characteristics of the current medium under a certain condition; the principle is that the calculation is carried out by a formula (1-1), namely, all peak values of the ultrasonic waveform effective time domain of the measuring point are distinguished and picked up, the peak values with absolute values larger than 1000mv and smaller than 8000mv are intercepted to participate in the calculation, the overrun amplitude values larger than 8000mv are all calculated according to 8000, all the picked peak values are multiplied by a square to be added and divided by the number of inflection points of the total picked peak values, and then the peak value picking threshold value is obtained by reducing in equal proportion:
in the formula: j-the jth inflection peak in this set of ultrasonic waveforms;
n is the total number of inflection point peaks in the ultrasonic wave pattern;
Uj-the voltage amplitude at the receiver of the jth knee peak in the set of ultrasonic waveforms;
f-the set of ultrasonic waveforms-the peak pickup threshold of the set of ultrasonic waveforms;
A1-a set of security parameters associated with the ultrasonic wave pattern;
the ultrasonic detection device in the fifth step is provided with an analysis program, comprises an ultrasonic smoothing coefficient algorithm, and can establish an accurate, semi-empirical or purely empirical function relationship with a plurality of characteristics of the current medium under a certain condition based on the discrimination value of the ultrasonic waveform trend; the principle is that the calculation is carried out through a formula (1-2), and a smooth coefficient algorithm is designed aiming at the change of the slope of the ultrasonic waveform, namely the voltage amplitude U of every three adjacent receiving endsi+1、Ui、Ui-1Calculating the difference value of the amplitude changes of two adjacent sections into a group, then accumulating the difference value and dividing the difference value by the total number to obtain the smoothing coefficient threshold value:
in the formula: i-the ith ultrasonic measurement point in the ultrasonic wave pattern;
m is the total number of ultrasonic measuring points in the group of ultrasonic wave modes;
Uithe voltage amplitude of the receiving end of the ith measuring point in the ultrasonic wave mode;
p-the smoothing coefficient threshold for the present set of ultrasonic waveforms;
A2-a set of security parameters associated with the ultrasonic wave pattern;
the ultrasonic detection device in the fifth step is provided with an analysis program, comprises an ultrasonic smoothing coefficient algorithm, and can establish an accurate, semi-empirical or purely empirical function relationship with a plurality of characteristics of the current medium under a certain condition based on the discrimination value of the ultrasonic waveform trend; the principle is that the calculation is carried out through a formula (1-3), namely all peak values of the ultrasonic waveform effective time domain of the measuring point are judged and picked up, the peak values with absolute values larger than 1000mv and smaller than 8000mv are intercepted to participate in the calculation, the over-limit amplitude values larger than 8000mv are all participated in the calculation according to 8000, all the picked-up peak values are multiplied by a square to be added and divided by the number of inflection points of the total picked-up peak values, and then the sum is reduced in equal proportion to obtain a peak value picking-up threshold value; voltage amplitude U of every three adjacent receiving endsi+1、Ui、Ui-1Calculating the difference value of the amplitude changes of two adjacent sections into a group, and then accumulating the difference value and dividing the sum by the total number to obtain a smoothing coefficient threshold value; and then adding the peak value picking threshold value and the weighted smoothing coefficient threshold value to obtain a peak value weighted smoothing coefficient threshold value:
m＝4096，Uj∈(1000，8000]
in the formula: i-the ith ultrasonic measurement point in the ultrasonic wave pattern;
m is the total number of ultrasonic measuring points in the group of ultrasonic wave modes;
Uithe voltage amplitude of the receiving end of the ith measuring point in the ultrasonic wave mode;
j-the jth inflection peak in this set of ultrasonic waveforms;
n is the total number of inflection point peaks in the ultrasonic wave pattern;
Uj-the voltage amplitude at the receiver of the jth knee peak in the set of ultrasonic waveforms;
Fp-the set of ultrasonic waveforms-a peak weighted smoothing coefficient threshold for the set of ultrasonic waveforms;
A3-a set of security parameters associated with the ultrasonic wave pattern;
the ultrasonic detection device in the fifth step is provided with an analysis program, and comprises a periodic pulse width threshold algorithm, wherein the periodic pulse width threshold algorithm is a discrimination value based on ultrasonic waveform trend, and can establish an accurate, semi-empirical or purely empirical function relationship with numerous characteristics of the current medium under a certain condition; the principle is that the calculation is carried out by a formula (1-4), namely all peak values of the ultrasonic waveform effective time domain of the measuring point are distinguished and picked up, the peak value with the absolute value larger than 1000mv and smaller than 8000mv is intercepted to participate in the calculation, the next peak value inflection point of the peak value inflection point is subtracted from the corresponding sound time of the peak value inflection point, the sound time difference corresponding to the adjacent peak value inflection point is added and divided by the number of the total picked peak value inflection points minus one, and then the equal proportion is reduced, so that the period pulse width threshold value can be obtained:
in the formula: j-the jth inflection peak in this set of ultrasonic waveforms;
n is the total number of inflection point peaks in the ultrasonic wave pattern;
Lj-when the jth inflection point in the set of ultrasonic waveforms corresponds to acoustic;
Uj-the voltage amplitude at the receiver of the jth knee peak in the set of ultrasonic waveforms;
t-period pulse width threshold of the ultrasonic wave pattern of the group;
A4-a set of security parameters associated with the ultrasonic wave patterns.
6. The method for measuring the cast-in-situ concrete grouting surface elevation of the bored pile according to claim 1, wherein the method comprises the following steps: the method is characterized in that different ultrasonic signals of different medium layers are measured by an ultrasonic method to layer the cast-in-situ bored pile, and the waveform and the amplitude are measured as criteria, so that the concrete cast-in-situ bored pile height can be measured accurately in real time.
7. The method for measuring the cast-in-situ concrete grouting surface elevation of the bored pile according to claim 1, wherein the method comprises the following steps: the device for detecting the elevation of the concrete pouring surface of the bored pile is bound at the accurate position of the concrete guide pipe, and the accurate position is the elevation of the concrete pouring surface corresponding to the concrete guide pipe when the concrete guide pipe is at the highest limit point.
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