CN111733899B - Real-time safety monitoring method for pile top in static load test process of concrete cast-in-place pile - Google Patents
Real-time safety monitoring method for pile top in static load test process of concrete cast-in-place pile Download PDFInfo
- Publication number
- CN111733899B CN111733899B CN202010557897.3A CN202010557897A CN111733899B CN 111733899 B CN111733899 B CN 111733899B CN 202010557897 A CN202010557897 A CN 202010557897A CN 111733899 B CN111733899 B CN 111733899B
- Authority
- CN
- China
- Prior art keywords
- pile
- piezoelectric aggregate
- signal
- piezoelectric
- static load
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2600/00—Miscellaneous
- E02D2600/10—Miscellaneous comprising sensor means
Abstract
The invention discloses a real-time safety monitoring method for a pile top in a static load test process of a concrete cast-in-place pile, which comprises the steps of pre-burying a plurality of paired piezoelectric aggregate drivers and piezoelectric aggregate sensors on the pile top in the casting process of the concrete cast-in-place pile, leading the piezoelectric aggregate drivers out of a pile body through cables to be connected with a signal generator, leading the piezoelectric aggregate sensors out of the pile body through cables to be connected with a data acquisition card, connecting the data acquisition card with a data analysis terminal, and casting and curing the concrete cast-in-place pile; after the maintenance is finished, a static load test platform is set up, a signal generator generates an excitation signal through a piezoelectric aggregate driver when the static load test platform is not loaded, a signal received by a piezoelectric aggregate sensor is used as a reference signal, the load is loaded, the received signals of the sensors at different loading stages are monitored, the received signals are compared with the reference signal, and the damage condition of the pile top is judged through signal change. The invention has low cost, and can ensure the monitoring accuracy to the maximum extent by synchronizing the monitoring and testing processes.
Description
Technical Field
The invention belongs to the technical field of foundation detection engineering, relates to a technology for monitoring the damage degree of a cast-in-place pile in a static load test process of a concrete cast-in-place pile, and particularly relates to a real-time safety monitoring method for a pile top in the static load test process of the concrete cast-in-place pile.
Background
The static load test of the cast-in-place pile is considered as the most intuitive and reliable traditional method for detecting the bearing capacity of the foundation pile. A common test platform consists of a counterforce device, a loading device, a load and displacement measuring device and a data acquisition device. The method for determining the vertical compressive bearing capacity of the single pile by adopting the actual working conditions close to the vertical compressive pile is the most intuitive and reliable test method for detecting the vertical compressive bearing capacity of the foundation pile.
The axial force of the concrete at the pile top part is larger during the test and the loading of the upper structure, and the concrete is one of the parts which are most easily damaged during the static load test of the pile foundation or after the pile foundation is loaded. In the static load test process, the pile top is damaged in advance to cause test failure and even safety accidents due to the fact that the pile body concrete is not aged, the pile body concrete strength is insufficient, the pile top surface is not treated in place, the center line of the pile top and the center line of the pile body are not coincident and the like.
The nondestructive testing of various structures by using intelligent materials represented by piezoelectric intelligent aggregates is rapidly developed and applied. The intelligent piezoelectric Aggregate (Smart Aggregate) is composed of a piezoelectric ceramic sheet connected with a lead, an outer waterproof coating, epoxy resin glue and a marble protective layer. The piezoelectric ceramic piece is an information functional material capable of mutually converting mechanical energy and electric energy, and has the advantages of positive and negative piezoelectric effect, quick response, wider response frequency band and the like, so that the stress change in concrete can be sensed, and the crack occurrence and development in the structure can be monitored in real time. The piezoelectric ceramic piece is bonded up and down by epoxy resin glue after waterproof treatment, and is protected and packaged by marble similar to concrete aggregate, so that the piezoelectric ceramic piece has wide application prospect in the aspects of detection and monitoring of a concrete structure due to the characteristics of easy manufacture, high sensitivity, low cost, low energy consumption and the like.
Disclosure of Invention
The invention aims to provide a real-time safety monitoring method for a pile top in a static load test process of a cast-in-place concrete pile, aiming at the blank of the field of monitoring the concrete safety of the pile top in the static load test of the cast-in-place concrete pile at present. The method is characterized in that two layers of piezoelectric aggregates which are annularly and uniformly distributed on the pile top are applied, the upper layer serves as a sensor, the lower layer serves as a driver, the attenuation condition of signal energy received by each piezoelectric aggregate sensor in the loading process is monitored in real time, the crack occurrence and development condition of the concrete at the pile top part in the test process are monitored, and the test failure and engineering accidents caused by the fact that the concrete at the pile top part is suddenly damaged due to insufficient concrete strength, improper arrangement of a counterforce device or quality reasons are avoided.
The purpose of the invention is realized as follows:
a real-time safety monitoring method for a pile top in a static load test process of a concrete cast-in-place pile is characterized by comprising the following steps:
step 2, leading out the piezoelectric aggregate driver from the pile body through a cable to be connected with a signal generator, leading out the piezoelectric aggregate sensors from the pile body through the cable to be connected with a data acquisition card, connecting the data acquisition card with a data analysis terminal, and pouring and curing the concrete cast-in-place pile;
step 3, after the maintenance of the concrete cast-in-place pile is finished, a static load test platform is set up, a signal generator generates an excitation signal through a piezoelectric aggregate driver, a signal received by a piezoelectric aggregate sensor at the moment is collected and transmitted to a data analysis terminal through a data acquisition card, the extracted characteristic parameter is used as a reference signal, and a characteristic parameter identification reference value is set up;
Further, in the step 4, the signal identification characteristic parameter is an energy value, and the energy value of the signal received by the piezoelectric aggregate sensor is represented as:
wherein, tsAnd tfSub-tables representing the initial and end times of the received signal, y (t) and fsRespectively representing discrete sample values and a sampling frequency of the received signal.
The criterion is defined as the relative rate of change R of the received signal energy value, calculated by the following equation:
wherein E is0For reference energy values before load application, E1The reference energy value is measured in real time during the loading process of the load.
Further, in the step 1, the piezoelectric aggregate driver is also located below the piezoelectric aggregate sensor.
Further, in the step 1, the piezoelectric aggregate driver and the piezoelectric aggregate sensor are respectively fixed on a reinforcement cage of the concrete cast-in-place pile through a lower supporting plate and an upper supporting plate.
Furthermore, the lower supporting plate and the upper supporting plate are of the same structure and are all annular frameworks, a plurality of clamping seats are uniformly distributed on the annular frameworks, the piezoelectric aggregate drivers or the piezoelectric aggregate sensors are installed in the clamping seats and then are filled and packaged through epoxy resin glue to be wrapped and protected, and the annular frameworks are welded and fixed in a reinforcement cage of the concrete cast-in-place pile.
Furthermore, a bayonet matched with a main pile body rib of the concrete cast-in-place pile is arranged on the periphery of the annular framework. The annular framework is connected with the pile body reinforcing steel bars in a welding mode after being occluded and positioned through the bayonets.
Furthermore, 5-12 piezoelectric aggregate drivers or piezoelectric aggregate sensors are arranged on the annular framework.
Furthermore, the clamping seats on the lower supporting plate and the upper supporting plate are correspondingly and oppositely arranged, so that the corresponding piezoelectric aggregate driver and the piezoelectric aggregate sensor are oppositely arranged.
Furthermore, the data acquisition card is an NI data acquisition card, the cable connected with the piezoelectric aggregate driver and the piezoelectric aggregate sensor is a BNC cable, the data analysis terminal is a computer terminal, the cable connected with the computer terminal is a USB cable, and a power amplifier is further arranged between the signal generator and the piezoelectric aggregate driver.
Further, in step 4, the excitation signal sent by the signal generator is a sine frequency sweep excitation electrical signal.
Further, a lower supporting plate and an upper supporting plate which are provided with a driver and a sensor are firmly welded with the bound reinforcement cage on a construction site. The cable is protected by a protective sleeve and is fixed with the stirrup; the two layers of supporting plates are oppositely arranged at the pile top part, the distance between the upper supporting plate and the designed pile top elevation is not less than 10cm, and the distance between the lower supporting plate and the designed pile top elevation is not more than 1 time of the pile diameter distance.
The invention has the following advantages and positive effects:
the invention is suitable for the cast-in-place pile types with various sizes and various construction processes, and flexibly arranges drivers/sensors according to the actual engineering requirements;
the invention is simple and convenient to install, has low cost, is synchronously constructed with pile foundation engineering, is synchronously monitored with a static load test, and is a nondestructive monitoring method for pile body concrete;
and thirdly, the integrity of the pile top concrete and the occurrence and development of cracks in the monitoring range of the driver and the sensor in the loading process are monitored in real time. When the crack is rapidly expanded, the test is stopped in time, so that safety accidents can be avoided, and the monitoring data can also be used for analyzing the causes of the test failure and the engineering quality accidents;
the method can be used for protecting the data cable after the monitoring is finished during the static load test, and can also be used for safety monitoring of pile foundation engineering during the upper structure construction and the building operation.
In conclusion, the invention has convenient installation and use and low cost, is finished along with the pouring of the concrete of the pile body, does not influence the construction period and the strength of the pile body, is synchronous in monitoring and testing process, can realize the real-time monitoring of the whole testing process, is suitable for the cast-in-place piles of various environments and various construction processes, and has obvious effect on the cast-in-place piles with large diameter and large tonnage.
Drawings
Fig. 1 is a block diagram of a real-time safety monitoring apparatus in embodiment 1 of the present invention.
Fig. 2 is a block diagram of a real-time safety monitoring apparatus in embodiment 2 of the present invention.
Fig. 3 is an overall schematic view of embodiment 2 of the present invention.
Fig. 4 is a schematic view of the connection between the inside of the pile body and the reinforcing steel bars in embodiment 1 of the present invention.
FIG. 5 is a schematic view of a pallet structure according to embodiment 1 of the present invention.
Fig. 6 is a cross-sectional view of a cartridge in an embodiment of the present invention.
Reference numerals: the system comprises a steel reinforcement cage 1, a main reinforcement 2, a stirrup 3, a lower support plate 4, an upper support plate 5, a piezoelectric aggregate driver 6, a piezoelectric aggregate sensor 7, a signal generator 8, a BNC cable 9, a power amplifier 10, an 11-NI data acquisition card 12, a USB cable 13, a computer terminal 14, a card seat 14, a 15-bayonet, a 16-annular framework, a 17-reserved hole and 18-epoxy resin.
Detailed Description
The embodiments of the present invention will be described in further detail with reference to the drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
The embodiments of the present invention are described as follows:
example 1
As shown in fig. 1 and 3 to 5, the real-time safety monitoring device for the pile top in the static load test process of the concrete cast-in-place pile comprises a lower supporting plate 4, an upper supporting plate 5, a plurality of piezoelectric aggregate drivers 6, a plurality of piezoelectric aggregate sensors 7, a signal generator 8, an NI data acquisition card 11 and a computer terminal 13.
The lower supporting plate 4 and the upper supporting plate 5 have the same structure and are both steel annular frameworks 16, bayonets 15 for engaging the main reinforcements 2 are reserved on the outer sides of the annular frameworks 16, the number of the bayonets 15 is determined according to the number of the designed pile body reinforcements, the size is determined according to the types of the designed reinforcements, the engaged connection of the reinforcements can be realized, and the bayonets are generally semicircular clamping grooves. A plurality of clamping seats 14 used for mounting the piezoelectric aggregate drivers 6 or the piezoelectric aggregate sensors 7 are uniformly distributed on the annular framework 16, the size of each clamping seat 14 is matched with the size of a sensor selected by specific engineering, the number of the clamping seats 14 is determined according to the pile diameter size and the monitoring requirement of the concrete cast-in-place pile, and in the embodiment, the clamping seats 14 are cylinders welded on the annular framework 16. The cylinder lateral wall is provided with and supplies the wall to reserve the preformed hole 17 that supplies BNC cable 9, the convenient wiring.
As shown in fig. 6, the piezoelectric aggregate driver 6 is installed in the clamping seat 14 of an annular framework 16, the BNC cable 9 connected with the piezoelectric aggregate driver 6 penetrates out of the preformed hole 17, and then the periphery of the piezoelectric aggregate driver 6 is filled and encapsulated with epoxy resin 18 glue to form an annular array of the piezoelectric aggregate driver.
As shown in fig. 6, the piezoelectric aggregate sensor 7 is installed on a clamping seat 14 of an annular framework 16, the BNC cable 9 connected with the piezoelectric aggregate sensor 7 penetrates out of a prepared hole 17, and then the periphery of the piezoelectric aggregate sensor 7 is filled and packaged with epoxy resin 18 glue to form an annular array of the piezoelectric aggregate sensor.
The piezoelectric aggregate driver 6 is connected with the signal generator 8 through a BNC cable 9, an excitation electric signal sent by the signal generator 8 is transmitted to the piezoelectric aggregate driver 6 through a cable, and the piezoelectric aggregate driver 6 converts the excitation electric signal into a stress wave signal to be transmitted in the cast-in-place pile; the piezoelectric aggregate sensor 7 is connected with an NI data acquisition card 11 through a BNC cable 9, the NI data acquisition card 11 is connected with a computer terminal 13 through a USB cable 12, the piezoelectric aggregate sensor 7 senses stress waves to generate receiving electric signals, the receiving electric signals are acquired and converted into digital signals through the NI data acquisition card 11, the digital signals are transmitted to the computer terminal 13, and the electric signals received by the piezoelectric aggregate sensor 7 are stored and processed through the computer terminal 13.
The real-time safety monitoring method comprises the following steps:
when the device is used, a reinforcement cage of a concrete cast-in-place pile is bound, the reinforcement cage comprises main reinforcements 2 and stirrups 3, then the lower support plate 4 provided with the piezoelectric aggregate driver 6 is occluded on the main reinforcements 2 of the reinforcement cage through the bayonet 15, the lower support plate 4 is positioned, and then the lower support plate 4 is welded and fixed on the main reinforcements 2, so that the lower support plate 4 and each main reinforcement 2 are firmly fixed together; and fixing the upper supporting plate 5 provided with the piezoelectric aggregate sensors 7 on the main ribs 2 above the lower supporting plate 4 according to the same method, and after the installation is finished, enabling the piezoelectric aggregate drivers 6 and the piezoelectric aggregate sensors 7 to be arranged oppositely and to be in one-to-one correspondence in position, thereby finishing the installation of the monitoring module.
Hoisting the steel reinforcement cage with the installed monitoring module into a drilled hole, performing the protection work of the BNC cable 9, leading out the pile body, pouring pile body concrete, waiting for the age, excavating the soil body around the pile, leveling the field, and preparing each item of static load test.
The piezoelectric aggregate driver 6, the power amplifier 10 and the signal generator 8 are sequentially connected through a BNC cable 9; connecting the piezoelectric aggregate sensor 7 with an NI data acquisition card 11 through a BNC cable 9; the NI data acquisition card 11 is connected with the computer terminal 13 through the USB cable 12, and the installation of the real-time safety monitoring device is completed.
The signal generator 8 generates a sine sweep frequency excitation electric signal with a certain frequency band, the sine sweep frequency excitation electric signal is transmitted to the power amplifier 10 through the BNC cable 9 and amplified, a vibration excitation signal is generated on the concrete cast-in-place pile through the piezoelectric aggregate driver 6, the vibration excitation signal transmits the signal to the piezoelectric aggregate sensor 7 through a pile body concrete medium, the piezoelectric aggregate sensor 7 is converted into a monitoring electric signal, the monitoring electric signal is transmitted to the input end of the NI signal acquisition card through the BNC cable, the NI signal acquisition card converts the signal into a digital signal, and the digital signal is transmitted to the computer terminal 13 through the USB cable 12, namely the computer analysis terminal performs data analysis.
And defining the signals of the piezoelectric aggregate sensor 7, which are measured when the age of the concrete is reached and the static load test is ready and is not loaded, as reference signals in the analysis of the computer terminal 13, and constructing a reference value of the identification characteristic parameters. And then, by monitoring the signal identification characteristic parameters of each loading stage of the static load test and comparing the characteristic parameters with the reference value, establishing a judgment standard (formula (2)) taking the relative change rate of the energy of the sensor as an index. Monitoring values obtained by each pair of sensors (one piezoelectric aggregate driver 6 and the piezoelectric aggregate sensor 7 corresponding to the position become a pair of sensors) are analyzed and a judgment index is calculated, if the change rate of one or a plurality of piezoelectric aggregate sensors 7 is reduced or negative values appear in the test process, a crack appears in pile body concrete, signal energy dissipation is caused, and the approximate position of the crack can be positioned at a position corresponding to the monitoring range of the sensor with abnormal relative change rate of energy. The more negative the relative change rate of energy, the more serious the damage condition of the pile body concrete is.
The energy value E of the signal received by the piezoelectric aggregate sensor 7 can be expressed as
Wherein, tsAnd tfSub-tables representing the initial and end times of the received signal, y (t) and fsRespectively representing discrete sample values and a sampling frequency of the received signal.
In this case, the relative change rate R of the received signal energy value, which is the structural peeling evaluation index, is calculated by the following formula:
the basic principle of the invention is that the piezoelectric aggregate drivers 6 and the piezoelectric aggregate sensors 7 are uniformly arranged in pairs along the circumferential direction of the pile, signals are generated by the signal generator 8 to excite the piezoelectric ceramic plates in the piezoelectric aggregate drivers 6, excitation signals (lamb waves) are transmitted in the concrete medium of the pile body, and the corresponding piezoelectric aggregate sensors 7 receive corresponding signals. And establishing a judgment standard by taking the relative change rate of lamb wave energy as an index. In the test process, if the relative change rate of energy suddenly has a negative value, the pile body concrete is cracked, the pile body concrete is damaged more seriously if the negative value is larger, the crack position can be approximately positioned in the monitoring range of a sensor with the negative value, and the test is immediately stopped and the reason is found out. The method provided by the invention has the advantages of simple principle and easy operation, can realize real-time monitoring and identification on the integrity of the pile top concrete, greatly reduces the potential safety hazard in the test process, avoids the occurrence of safety accidents and provides a basis for the analysis of quality accident reasons. Besides, if the data cable can be protected after the test is finished, the monitoring of the whole life cycle of the building foundation can be realized, the integrity of the concrete at the top of the pile foundation in the life cycle and the development condition of cracks are monitored, and the method has positive significance on engineering safety.
It should be noted that in an embodiment specifically adopted by the present invention, when the signal generator 8 generates the excitation signal for the piezoelectric aggregate drivers 6, all the piezoelectric aggregate drivers 6 are excited simultaneously, the piezoelectric aggregate sensors 7 receive the signal simultaneously, the piezoelectric aggregate (the piezoelectric aggregate drivers 6 and the piezoelectric aggregate sensors 7) are arranged in a pair of directional arrangements, the pair of directional arrangements is arranged oppositely, the propagation line is shortest, the signal is strongest, the signal is primarily screened from the pair, the signal with the largest amplitude is selected as the useful signal, and the received signal is primarily screened, and the signal with the strongest amplitude is used as the useful signal for the subsequent diagnosis and judgment.
Example 2:
as shown in fig. 2, in order to cope with the situation that the pile body of the concrete cast-in-place pile is large, a power amplifier 10 is added between a signal generator 8 and a piezoelectric aggregate driver 6, when the concrete cast-in-place pile is installed, the piezoelectric aggregate driver 6 is sequentially connected with the power amplifier 10 and the signal generator 8 through a BNC cable 9, an excitation electrical signal sent by the signal generator 8 is amplified by the power amplifier 10 and then transmitted to the piezoelectric aggregate driver 6, a stronger excitation signal is sent, the piezoelectric aggregate driver 6 converts the excitation electrical signal into a stress wave signal and transmits the stress wave signal in the cast-in-place pile, and the piezoelectric aggregate sensor 7 can receive the stronger signal conveniently. Other structures and using methods of the present embodiment are completely the same as those of embodiment 1.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiment, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (7)
1. A real-time safety monitoring method for a pile top in a static load test process of a concrete cast-in-place pile is characterized by comprising the following steps:
step 1, in the pouring process of a concrete cast-in-place pile, embedding a plurality of paired piezoelectric aggregate drivers and piezoelectric aggregate sensors at the pile top, wherein the piezoelectric aggregate drivers are positioned on the same layer and are uniformly distributed in the circumferential direction of the concrete cast-in-place pile, and the corresponding piezoelectric aggregate sensors are also positioned on the same layer and are positioned on the same plumb line with the corresponding piezoelectric aggregate drivers;
step 2, leading out the piezoelectric aggregate driver from the pile body through a cable to be connected with a signal generator, leading out the piezoelectric aggregate sensors from the pile body through the cable to be connected with a data acquisition card, connecting the data acquisition card with a data analysis terminal, and pouring and curing the concrete cast-in-place pile;
step 3, after the maintenance of the concrete cast-in-place pile is finished, a static load test platform is set up, a signal generator generates an excitation signal through a piezoelectric aggregate driver, a signal received by a piezoelectric aggregate sensor at the moment is collected and transmitted to a data analysis terminal through a data acquisition card, the extracted characteristic parameter is used as a reference signal, and a characteristic parameter identification reference value is set up;
step 4, carrying out a static load test, wherein in the load loading process, according to the method in the step 3, a signal generator continuously generates an excitation signal through a piezoelectric aggregate driver, a data analysis terminal monitors signal identification characteristic parameters of each loading stage of the static load test and compares the signal identification characteristic parameters with a reference value, a judgment standard taking the energy relative change rate of a sensor as an index is established, the change of the pile top safety and the integrity in the static load test process is judged through the change of the signal identification characteristic parameters, if the signal change rate received by one or a plurality of piezoelectric aggregate sensors is reduced or negative values appear in the test process, the crack appears in the concrete of the pile body, the signal energy dissipation is caused, the approximate position of the crack can be positioned at the position corresponding to the monitoring range of the piezoelectric aggregate sensor with abnormal energy relative change rate, the negative value of the energy relative change rate is larger, the more serious the damage condition of the pile body concrete is;
in the step 1, the piezoelectric aggregate driver and the piezoelectric aggregate sensor are respectively fixed on a reinforcement cage of the concrete cast-in-place pile through a lower supporting plate and an upper supporting plate; the structure of the lower supporting plate and the structure of the upper supporting plate are completely the same and are both annular frameworks, a plurality of clamping seats are uniformly distributed on the annular frameworks, the piezoelectric aggregate drivers or the piezoelectric aggregate sensors are installed in the clamping seats and then are filled and packaged through epoxy resin glue, the piezoelectric aggregate drivers or the piezoelectric aggregate sensors are wrapped and protected, and the epoxy resin glue is filled and packaged to achieve the effects of protection and firm bonding; the annular framework is welded and fixed in a reinforcement cage of the concrete cast-in-place pile.
2. The real-time safety monitoring method for the pile top in the static load test process of the concrete filling pile according to claim 1, characterized in that: in the step 4, the signal identification characteristic parameter is an energy value, and the energy value of the signal received by the piezoelectric aggregate sensor is represented as:
wherein, tsAnd tfRespectively representing the initial and end times of the received signal, y (t) and fsRespectively representing discrete sampling values and sampling frequencies of the received signal;
the criterion is defined as the relative rate of change R of the received signal energy value, calculated by the following equation:
wherein E is0For reference energy values before load application, E1The reference energy value is measured in real time during the loading process of the load.
3. The real-time safety monitoring method for the pile top in the static load test process of the concrete filling pile according to claim 1, characterized in that: the periphery of the annular framework is provided with a bayonet matched with a pile body main reinforcement of the concrete cast-in-place pile, and the annular framework is connected with the pile body reinforcement through welding after being occluded and positioned through the bayonet.
4. The real-time safety monitoring method for the pile top in the static load test process of the concrete filling pile according to claim 1, characterized in that: 5-12 piezoelectric aggregate drivers or piezoelectric aggregate sensors are arranged on the annular framework.
5. The real-time safety monitoring method for the pile top in the static load test process of the concrete filling pile according to claim 1, characterized in that: the clamping seats on the lower supporting plate and the upper supporting plate are correspondingly and oppositely arranged, so that the corresponding piezoelectric aggregate driver and the piezoelectric aggregate sensor are oppositely arranged.
6. The real-time safety monitoring method for the pile top in the static load test process of the concrete cast-in-place pile as claimed in claim 1 or 2, characterized in that: the data acquisition card is an NI data acquisition card, the cable connected with the piezoelectric aggregate driver and the piezoelectric aggregate sensor is a BNC cable, the data analysis terminal is a computer terminal, the cable connected with the computer terminal is a USB cable, and a power amplifier is further arranged between the signal generator and the piezoelectric aggregate driver.
7. The real-time safety monitoring method for the pile top in the static load test process of the concrete cast-in-place pile as claimed in claim 1 or 2, characterized in that: in step 4, the excitation signal sent by the signal generator is a sine sweep frequency excitation electrical signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010557897.3A CN111733899B (en) | 2020-06-18 | 2020-06-18 | Real-time safety monitoring method for pile top in static load test process of concrete cast-in-place pile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010557897.3A CN111733899B (en) | 2020-06-18 | 2020-06-18 | Real-time safety monitoring method for pile top in static load test process of concrete cast-in-place pile |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111733899A CN111733899A (en) | 2020-10-02 |
| CN111733899B true CN111733899B (en) | 2022-02-18 |
Family
ID=72649685
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010557897.3A Active CN111733899B (en) | 2020-06-18 | 2020-06-18 | Real-time safety monitoring method for pile top in static load test process of concrete cast-in-place pile |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111733899B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114137071A (en) * | 2021-11-03 | 2022-03-04 | 上海建工五建集团有限公司 | Steel pipe concrete column quality detection device and method |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10253601A (en) * | 1997-03-05 | 1998-09-25 | Hokuriku Biitsuku Chika Tansa Kk | Strength determination method of ground improving body |
| JP2004317364A (en) * | 2003-04-17 | 2004-11-11 | Tokyo Denki Univ | Device for quick loading test of pile |
| CN101560778A (en) * | 2009-05-07 | 2009-10-21 | 邓业灿 | Geophysical prospection stress wave detection method for building foundation pile |
| CN102277884A (en) * | 2011-05-17 | 2011-12-14 | 浙江大学城市学院 | Device for treating pile head for vertical static load test and construction method thereof |
| CN203705266U (en) * | 2014-01-21 | 2014-07-09 | 安徽省建筑工程质量监督检测站 | Static load testing device for testing engineering pile |
| CN103981908A (en) * | 2014-06-03 | 2014-08-13 | 武汉大学 | Device and method for monitoring and assessing coupling performance of concrete pile foundation and soil body |
| CN104142270A (en) * | 2014-07-31 | 2014-11-12 | 桂林理工大学 | Large reverse loading device |
| CN106088170A (en) * | 2016-08-09 | 2016-11-09 | 浙江省建设工程质量检验站有限公司 | Detection device and the detection method thereof of foundation pile length is determined based on parallel seismic wave method |
-
2020
- 2020-06-18 CN CN202010557897.3A patent/CN111733899B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10253601A (en) * | 1997-03-05 | 1998-09-25 | Hokuriku Biitsuku Chika Tansa Kk | Strength determination method of ground improving body |
| JP2004317364A (en) * | 2003-04-17 | 2004-11-11 | Tokyo Denki Univ | Device for quick loading test of pile |
| CN101560778A (en) * | 2009-05-07 | 2009-10-21 | 邓业灿 | Geophysical prospection stress wave detection method for building foundation pile |
| CN102277884A (en) * | 2011-05-17 | 2011-12-14 | 浙江大学城市学院 | Device for treating pile head for vertical static load test and construction method thereof |
| CN203705266U (en) * | 2014-01-21 | 2014-07-09 | 安徽省建筑工程质量监督检测站 | Static load testing device for testing engineering pile |
| CN103981908A (en) * | 2014-06-03 | 2014-08-13 | 武汉大学 | Device and method for monitoring and assessing coupling performance of concrete pile foundation and soil body |
| CN104142270A (en) * | 2014-07-31 | 2014-11-12 | 桂林理工大学 | Large reverse loading device |
| CN106088170A (en) * | 2016-08-09 | 2016-11-09 | 浙江省建设工程质量检验站有限公司 | Detection device and the detection method thereof of foundation pile length is determined based on parallel seismic wave method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111733899A (en) | 2020-10-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102016641B (en) | Collapse prediction method for ground structure | |
| CN201177585Y (en) | Pile foundation high strain detection device | |
| US6533502B2 (en) | Wireless apparatus and method for analysis of piles | |
| CN103995023B (en) | Concrete filled steel tubular member tube wall peels off defect inspection method with concrete interface | |
| CN111733899B (en) | Real-time safety monitoring method for pile top in static load test process of concrete cast-in-place pile | |
| CN113109176B (en) | Joint rock mass in-situ shearing test device and method for relaxation process detection | |
| CN104131544A (en) | Cast-in-place reinforced concrete underground structure lateral soil pressure test device and method | |
| Liu et al. | Monitoring the damage evolution of reinforced concrete during tunnel boring machine hoisting by acoustic emission | |
| CN104763000A (en) | Detection method for completeness of foundation pile | |
| CN212866077U (en) | Concrete filling pile static load test unbalance loading monitoring device | |
| CN212568211U (en) | Real-time safety monitoring device for pile top in static load test process of cast-in-place concrete pile | |
| CN207366489U (en) | It is a kind of to be used to monitor the elastic piezoelectric ceramics system of anchoring | |
| CN108802188A (en) | Grouting fullness detection method and system based on sleeve surface excitation | |
| CN204662519U (en) | A kind of checkout gear of foundation pile integrity and weight thereof | |
| CN207633331U (en) | A kind of cast-in-situ bored pile pile quality control device | |
| CN109100232B (en) | Testing device for detecting vertical bearing capacity of climbing cone of bridge tower and using method | |
| CN111579355B (en) | Method for monitoring unbalanced load of static load test of bored concrete pile | |
| CN108593236B (en) | Load experiment separation method for blasting impact and transient unloading | |
| CN103207041B (en) | Piezoelectric tension monitoring device | |
| CN115656485A (en) | Method and device for testing non-uniform constrained shrinkage | |
| CN104790994B (en) | Rockbolt stress state rapid evaluation device and application process thereof | |
| CN104236837A (en) | Load impact experimental system and application method thereof | |
| CN209353385U (en) | A kind of existing building pile's integrity testing device that can repeat hammering automatically | |
| CN113404100A (en) | Foundation load test device and test method thereof | |
| CN209961162U (en) | Testing device for moisture-insulating stress-free meter in large-volume low-heat concrete |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |