CN212405283U - Anti-floating anchor pile test device - Google Patents
Anti-floating anchor pile test device Download PDFInfo
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- CN212405283U CN212405283U CN202022128082.1U CN202022128082U CN212405283U CN 212405283 U CN212405283 U CN 212405283U CN 202022128082 U CN202022128082 U CN 202022128082U CN 212405283 U CN212405283 U CN 212405283U
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Abstract
The utility model discloses an anti-floating anchor pile testing device, which comprises an anti-floating anchor pile, a sensing assembly, a temperature and humidity sensing system, a data acquisition system, a data transmission system, a data processing and analyzing system, a monitoring result display system, a loading system and a power device; the sensing assembly comprises a first strain sensing optical fiber, a second strain sensing optical fiber and a temperature sensing optical fiber; the method comprises the steps that a first strain sensing optical fiber is arranged in a groove in an anchor rod pile, a second strain sensing optical fiber and a temperature sensing optical fiber are arranged on the periphery of a reinforcing steel bar, a vertical load applying system is used for carrying out a drawing test on the anti-floating anchor rod pile, a BOTDA data acquisition system, a fiber bragg grating data acquisition system and a DTS data acquisition system are used for further measuring strain and temperature information of a pile body of the anti-floating anchor rod pile, and the strain and temperature information is displayed in a monitoring result display system in a chart form. The utility model has the advantages of the construction wiring is simple, data measurement accuracy is high, the drift is little and waterproof nature is good.
Description
Technical Field
The utility model relates to an anchor rod pile among the geotechnical engineering field especially relates to an anti-floating anchor rod pile test device.
Background
With the rapid forward progress of urbanization, the development and utilization of underground space continuously develop along with depth, higher requirements are provided for how to resist floating of underground engineering, and in recent years, anti-floating anchor rod piles are widely applied in underground anti-floating measures of building engineering due to unique performance of the anti-floating anchor rod piles, but due to the complex and changeability of rock-soil bodies, the stress condition of anchor rods in soil is very complex, and the calculation of the anchoring capacity of the anti-floating anchor rod piles is very difficult.
At present, the adhesion anchor capacity of the anchor rod pile is measured by adopting a traditional static pressure anchor rod pile drawing test in engineering, so that the pile body deformation of the anti-floating anchor rod pile is researched. However, when the traditional dial indicator and the pressure sensor are used for monitoring, monitoring data are often lost due to the fact that the traditional dial indicator and the pressure sensor are prone to electromagnetic interference and damage, the drawing test characteristics of the anti-floating anchor rod pile cannot be comprehensively obtained, and optimization design and construction of the anchor rod pile are difficult to achieve.
Aiming at the defects of the traditional test method of the anti-floating anchor rod pile, the new technology and method are adopted to research the deformation of the pile body of the anti-floating anchor rod pile, so that the popularization and the use are of great significance, and therefore, the development of the anti-floating anchor rod pile test device is a technical problem which needs to be solved urgently.
SUMMERY OF THE UTILITY MODEL
Utility model purpose: the utility model discloses an anti-floating anchor pile test device to overcome easily receive electromagnetic interference among the prior art, can not acquire anti-floating anchor pile comprehensively and draw the shortcoming of experimental characteristic.
The technical scheme is as follows: the utility model discloses anti-floating anchor pile test device includes anti-floating anchor pile, sensing assembly, humiture sensing system, data acquisition system, data transmission system, data processing and analytic system, monitoring result display system, loading system and power device;
the sensing assembly comprises a first strain sensing optical fiber, a second strain sensing optical fiber and a temperature sensing optical fiber; the first strain sensing optical fiber is arranged in the anchor rod, and the second strain sensing optical fiber and the temperature sensing optical fiber are arranged around the anchor rod;
the data acquisition system comprises a BOTDA data acquisition system, a fiber bragg grating data acquisition system and a DTS data acquisition system; the first strain sensing optical fiber is connected with the fiber bragg grating data acquisition system, the second strain sensing optical fiber is connected with the BOTDA data acquisition system, the temperature sensing optical fiber is connected with the DTS data acquisition system, and the acquired data are transmitted to the data processing and analyzing system through the data transmission system;
the loading system comprises a steel base plate, a steel support, a counter-force beam, a steel beam and a jack, wherein the steel base plate is located on the anchor rod pile, the steel support is fixed on the steel base plate, and the counter-force beam is reinforced through the steel beam.
The anti-floating anchor pile is a cast-in-place anchor pile, a pile driver is used for punching holes on site, concrete is poured into the holes to form anchoring bodies, then the anchor is sunk into the holes after primary grouting, secondary grouting is carried out, and finally the anti-floating anchor pile is formed.
The measured data are transmitted to a data processing and analyzing system through a data transmission system, the data transmission system of the device system is transmitted to a cloud platform in the system through information, and the data of the cloud platform are transmitted to the data processing and analyzing system through 5G.
The utility model discloses still include the monitoring tool case, this BOTDA data acquisition system, DTS data acquisition system, fiber grating data acquisition system and temperature and humidity sensing system are located this monitoring tool case.
The working principle is as follows: the utility model discloses among the anti-floating anchor pile body deformation monitoring test, lay first strain sensing optic fibre through at the inside recess of anti-floating anchor pile body stock to and arrange second strain sensing optic fibre and temperature sensing optic fibre all around, utilize vertical load to apply the system and draw the experiment to anti-floating anchor pile, and utilize BOTDA data acquisition system, fiber grating data acquisition system and DTS data acquisition system, and then anti-floating anchor pile body strain and temperature are surveyed to the high accuracy. The sensing technology uses light as a carrier and optical fiber as a medium, senses and transmits external signals, and can monitor temperature, strain and breakpoint loss in real time and high-precision for a long time. The specific test process is as follows:
the first strain sensing optical fiber with the thickness of 0.9mm is arranged in the anchor rod in a slotted mode, the first strain sensing optical fiber is fixed by adopting AB glue in a sealing mode, the second strain sensing optical fiber with the thickness of 2.0mm and the temperature sensing optical fiber are fixed on the outer side face of the anchor rod in a fixed point mode, a self-locking nylon ribbon is used for fixing the second strain sensing optical fiber and the temperature sensing optical fiber in the fixed point mode, the second strain. The method comprises the steps of applying required load through a jack vertical load applying system to carry out an anti-floating anchor pile field drawing test, acquiring 0.9mm first strain optical fiber data by using an optical fiber grating data acquisition system, acquiring 2.0mm second strain sensing optical fiber data by using a BODTA data acquisition system, acquiring temperature real-time data by using a DTS data acquisition system, mastering strain distribution and temperature distribution real-time data of deformation of an anti-floating anchor pile body, leading the acquired data into a data processing and analyzing system through a data transmission system to obtain an anti-floating anchor pile stress strain curve and a time-temperature curve, and displaying a processed data result in a monitoring result display system.
Has the advantages that: the utility model has the advantages of it is following:
(1) the utility model discloses combine fiber grating, BOTDA and DTS monitoring technology, have that the construction wiring is simple, sensitivity is high, spatial resolution is high, the interference killing feature is strong, data measurement accuracy is high, measuring range is big and the advantage that adaptive capacity is strong, has waterproof nature and high temperature resistance characteristic moreover, is fit for anti-floating anchor stake measurement, can counter floating anchor stake temperature distribution and the accurate dynamic measurement of strain distribution.
(2) The monitoring tool box combines the fiber bragg grating, the BOTDA and the DTS fiber monitoring technology, is small and portable, is suitable for various working environments, and is used for automatically processing the stress-strain distribution of the pile body of the anti-floating anchor pile and the data of the change of the temperature of the pile body along with time by the configured data processing and analyzing system.
(3) The utility model discloses a whole set of test device degree of automation is high, and easy operation is swift, and measuring effect is good, and operational environment strong adaptability, application prospect is extensive, convenient to popularize and use.
Drawings
FIG. 1 is a schematic structural view of the testing device of the present invention;
FIG. 2 is a schematic view of the inside of the testing device of the present invention;
FIG. 3 is a perspective view of the testing device of the present invention;
FIG. 4 is a schematic view of optical fiber arrangement of an anti-floating anchor pile;
fig. 5 is a schematic diagram of optical fiber layout of the cross section of the anti-floating anchor pile.
Detailed Description
Examples
As shown in fig. 1 to 5, the utility model discloses anti-floating anchor pile test device includes anti-floating anchor pile 1, sensing component, temperature and humidity sensing system 8, data acquisition system, data transmission system, data processing and analytic system 10, monitoring result display system 11, loading system and power device, and wherein power device adopts solar cell panel 23. The utility model discloses a concrete structure as follows:
the sensing assembly comprises a first strain sensing optical fiber 2 with the thickness of 0.9mm, a second strain sensing optical fiber 3 with the thickness of 2.0mm and a temperature sensing optical fiber 4; the data acquisition system comprises a BOTDA data acquisition system 5, a fiber bragg grating data acquisition system 6 and a DTS data acquisition system 7; the anti-floating anchor pile 1 is a cast-in-place anchor pile, a pile driver is used for punching holes on site, concrete is poured into the holes to form anchoring bodies 16, then the anchor rods 15 are sunk into the holes after primary grouting, secondary grouting is carried out, and finally the anti-floating anchor pile 1 is formed.
The optical fibers adopt 3 types of optical fibers which are respectively a 0.9mm first strain sensing optical fiber 2, a 2.0mm second strain sensing optical fiber 3 and a temperature sensing optical fiber 4, wherein the 0.9mm first strain sensing optical fiber 2 is arranged in the anchor rod 15 in a groove mode, and the 2.0mm second strain sensing optical fiber 3 and the temperature sensing optical fiber 4 are arranged close to the periphery of the anchor rod and are fixed through a binding belt 37.
In the monitoring tool box 12, the first strain sensing optical fiber 2, the second strain sensing optical fiber 3, the temperature sensing optical fiber 4 and the jumper 13 are connected with the monitoring tool box 12 after being welded, and different interfaces, such as a first optical fiber interface 28, a second optical fiber interface 29, a third optical fiber interface 30 and a fourth optical fiber interface 31, are lapped according to different monitoring requirements.
The 0.9mm first strain sensing optical fiber 2 is connected with the fiber bragg grating data acquisition system 6, the 2.0mm second strain sensing optical fiber 3 is connected with the BOTDA data acquisition system 5, the temperature sensing optical fiber 4 is connected with the DTS data acquisition system 7, the acquired data are transmitted into the data processing and analyzing system 10 through the data transmission system 9, the data processing and analyzing system is connected with the monitoring result display system 11, and the processed monitoring data are displayed on the monitoring result display system.
The utility model discloses drawing experimental monitoring time measuring at anti-floating anchor stake, utilizing jack 21 to exert pressure, at the beginning of the monitoring, with optical fiber sensor and the butt fusion of wire jumper 13, the butt fusion department uses pyrocondensation pipe 14 to protect, then tests the monitoring.
The measured data is transmitted to a data processing and analyzing system 10 through a data transmission system 9, the data transmission system of the device system transmits 5G information to a cloud platform in the system, and the data of the cloud platform is transmitted to the data processing and analyzing system 10 through 5G.
For the temperature and humidity sensing system 8 in the device, the temperature and humidity conditions of the surrounding soil environment or the pile body environment are measured according to requirements by connecting the lead wires into the interface 31 of the temperature and humidity sensing system.
On the outer surface of the monitoring tool box, a two-dimensional code 24 is arranged. The operator can know the detailed principle and the using method of the testing device by scanning the two-dimensional code on the surface of the tool box, and the testing device can be opened only by opening the one-key switch button 25 on the monitoring tool box.
As shown in fig. 1, the loading system in the test apparatus relies primarily on the jack apparatus to provide the required tension.
As shown in fig. 2 and 3, for the internal schematic diagram of the testing apparatus, the monitoring tool box 12 includes four monitoring systems, i.e., a BOTDA data acquisition system 5, a DTS data acquisition system 7, a fiber grating data acquisition system 6, and a temperature and humidity sensing system 8, wherein the data transmission transmits the monitoring data in the computer to the data processing and analyzing system through 5G wireless signals, and the apparatus is also wirelessly charged through the solar cell panel 23.
In addition, a dust screen 26 is arranged on the outer shell of the monitoring tool box 12, a heat dissipation port 27 is formed in the dust screen, and a display result is displayed through the first display screen 32 and the second display screen 40; the bracket 33 is arranged above the monitoring tool box 12, and the side surface of the monitoring tool box is sequentially provided with a temperature sensor 37, a humidity sensor 38, a lithium battery pack 39, a power supply 41, a cooling fan 42, a wireless data transmission terminal 43 and a power supply lamp 44.
It can be seen from the schematic diagram of laying the optical fibers of the anti-floating anchor rod pile in fig. 4 and the schematic diagram of laying the optical fibers of the cross section of the anti-floating anchor rod pile in fig. 5 that the test device lays the first strain sensing optical fiber 2 of 0.9mm horizontally in the groove, the first strain sensing optical fiber is fixed by the AB glue, the second strain sensing optical fiber 3 of 2.0mm and the temperature sensing optical fiber 8 are fixed on the outer side surface of the anchor rod 15 at a fixed point, and the fixed point is fixed by the self-locking nylon.
The utility model discloses test device's test method as follows:
(1) selecting three HRB400 steel bars with the diameter of 25mm, and forming an anchor rod required by the test in a point connection and reinforcement combining mode;
(2) cleaning the surface of a steel bar, paying off the surface of the steel bar by using an ink box line drawing mode, drawing a preset laying line to enable the laying line to be flat, and cutting a groove with the diameter of 3mm along the ink line by using a cutting machine to serve as a line for laying optical fibers;
(3) cleaning a preset laid line, and removing foreign matters on the surface to enable the surface to be flat and smooth, so that a section of optical fiber is avoided;
(4) arranging 0.9mm first strain sensing optical fibers along the groove, wherein the optical fibers are fixedly protected in the groove 35 by using AB glue 34 after the optical fibers are arranged, arranging 2.0mm second strain sensing optical fibers and temperature sensing optical fibers to be attached to the periphery of the outer side of the anchor rod, fixing by using a binding belt 36 after the optical fibers are arranged, pre-tensioning the optical cables to enable the distributed optical fiber sensor to be in a stretched straight state, and protecting the part of the optical fiber pile body by using an armored protective sleeve;
(5) punching by using a pile driver, placing a steel pile casing to prevent the anchor rod from being inclined when the anchor rod is placed down during punching, then pouring concrete in the hole, sinking the anchor rod into the hole of the poured concrete, performing secondary grouting maintenance on the concrete by adopting C35 fine-stone concrete, protecting a measuring point at the hole opening, and then maintaining the anti-floating anchor rod pile; after piling is finished, a warning board is placed at the measuring point to warn field constructors, so that the aim of protecting the measuring point is fulfilled; when the pile driver punches, a steel casing is placed, and the anchor rod is ensured to be vertical in the process of lowering the anchor rod, so that the optical fiber is prevented from being broken accidentally;
(6) after maintenance is finished, the end parts of the strain sensing optical fiber and the temperature sensing optical fiber are respectively welded with the sensing optical fiber, a heat-shrinkable tube for increasing strength and durability is added at the welding position of the optical fibers, the first strain sensing optical fiber with the thickness of 0.9mm is connected with a fiber grating data acquisition system, the second strain sensing optical fiber with the thickness of 2.0mm is connected with a BOTDA data acquisition system, and the temperature sensing optical fiber is connected with a DTS data acquisition system;
(7) symmetrically placing steel backing plates 17 on two sides of a pile top, placing steel supports 18 on the steel backing plates, then placing reaction beams 19, reinforcing by using I-shaped steel beams 20, then horizontally and centrally placing a jack 21 on the I-shaped steel beams, and finally fixedly placing an anchor backing plate 22 on the upper part of the jack;
(8) the load application system takes the anti-floating anchor rod pile as a center, the resultant force center of the jack is superposed with the pile axis, and required force is applied to carry out a drawing test; the drawing test is cyclic graded loading, the observation time under each grade of load is not less than 5 minutes, and the number of data reading times is not less than 3;
(9) connecting the optical fiber connector with different data acquisition systems in a monitoring tool box according to requirements, setting corresponding parameters, checking system connectivity, then performing initial value acquisition, and verifying monitoring data validity so as to perform subsequent tests;
(10) and transmitting the measured data to a data processing and analyzing system through a data transmission system to obtain a stress-strain curve and a time-temperature curve of the anti-floating anchor pile, and displaying the processed data result on a monitoring result display system.
In the step (6), when a heat shrinkable tube for increasing rigidity and durability is added at the optical fiber fusion splice, the optical fiber fusion splice step includes:
a. stripping a coating surface protective layer on the surface of the optical fiber end head, and dipping alcohol by using dust-free paper to wipe dust on the surface of the bare fiber;
b. cutting the cleaned bare fiber connector, ensuring that the optical fiber is fixed in a groove reserved by a cutting knife during cutting, and flattening the fracture of the end face of the cut optical fiber;
c. fixing two prepared optical fibers in a groove of a fusion splicer, aligning two ends respectively, and then starting the fusion splicer to perform discharge fusion splicing on the two ends;
d. and after the fusion is finished, moving the heat-shrinkable tube sleeved near the end of the optical fiber to a fusion position, and placing the fusion position in a heating device of a fusion machine for heating so that the heat-shrinkable tube is fixed at the fusion position of the optical fiber to obtain protection.
Claims (7)
1. The utility model provides an anti-floating anchor rod stake test device which characterized in that: the device comprises an anti-floating anchor rod pile (1), a sensing assembly, a temperature and humidity sensing system (8), a data acquisition system, a data transmission system (9), a data processing and analyzing system (10), a monitoring result display system (11), a loading system and a power device;
the sensing assembly comprises a first strain sensing optical fiber (2), a second strain sensing optical fiber (3) and a temperature sensing optical fiber (4); the first strain sensing optical fiber is arranged in the anchor rod, and the second strain sensing optical fiber and the temperature sensing optical fiber are arranged around the anchor rod;
the data acquisition system comprises a BOTDA data acquisition system (5), a fiber bragg grating data acquisition system (6) and a DTS data acquisition system (7); the first strain sensing optical fiber is connected with a fiber bragg grating data acquisition system, the second strain sensing optical fiber is connected with a BOTDA data acquisition system, and the temperature sensing optical fiber is connected with a DTS data acquisition system; the data acquired by the data acquisition system is transmitted to a data processing and analyzing system through a data transmission system;
the loading system comprises a steel base plate (17), a steel support (18), a reaction beam (19), a steel beam (20) and a jack (21); the steel backing plate is located the stock stake, the steel support is fixed on the steel backing plate, the counter-force roof beam passes through the girder steel and consolidates.
2. The anti-floating anchor rod pile testing device according to claim 1, characterized in that: the anti-floating anchor pile comprises an anchor rod (15) and a poured anchoring body (16), wherein the anchor rod is positioned in the anchoring body.
3. The anti-floating anchor rod pile testing device according to claim 1, characterized in that: the data acquisition system transmits data to a cloud platform in the data transmission system, and the cloud platform transmits the data to the data processing and analyzing system after processing.
4. The anti-floating anchor rod pile testing device according to claim 1, characterized in that: the power device is a solar panel (23).
5. The anti-floating anchor rod pile testing device according to claim 1, characterized in that: the BOTDA monitoring system is characterized by further comprising a monitoring tool box (12), wherein the BOTDA data acquisition system (5), the DTS data acquisition system (7), the fiber grating data acquisition system (6) and the temperature and humidity sensing system (8) are located in the monitoring tool box.
6. The anti-floating anchor rod pile testing device according to claim 1, characterized in that: the anchor rod is provided with a groove, and the first strain sensing optical fiber is arranged in the groove of the anchor rod.
7. An anti-floating anchor pile testing device according to any one of claims 1 to 6, wherein: the anchor rod is formed by connecting reinforcing steel bars in a point-to-point and reinforcing steel bar combining mode.
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| CN202022128082.1U CN212405283U (en) | 2020-09-25 | 2020-09-25 | Anti-floating anchor pile test device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112195984A (en) * | 2020-09-25 | 2021-01-08 | 中交投资南京有限公司 | Anti-floating anchor rod pile test device and test method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112195984A (en) * | 2020-09-25 | 2021-01-08 | 中交投资南京有限公司 | Anti-floating anchor rod pile test device and test method |
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