CN103882893B - Based on pile foundation Dynamic loading test system and the method for testing of fiber grating - Google Patents
Based on pile foundation Dynamic loading test system and the method for testing of fiber grating Download PDFInfo
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- CN103882893B CN103882893B CN201410118137.7A CN201410118137A CN103882893B CN 103882893 B CN103882893 B CN 103882893B CN 201410118137 A CN201410118137 A CN 201410118137A CN 103882893 B CN103882893 B CN 103882893B
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Abstract
The invention discloses a kind of pile foundation Dynamic loading test system based on fiber grating and method of testing, this pilot system comprises reaction rack equipment, power charger, soil holding groove and monitoring device.This test method utilizes a set of power loading system to simulate multiple vibration wave to act on foundation pile, recorded the ess-strain deformation of foundation pile by the sensor fibre grating be laid in pile foundation.Together with reaction rack equipment is cast in soil holding groove by the present invention, ensure that counter-force is transmitted reliable and stable; Power charger accurately can control Loaded contact analysis in dynamic test process and load; Monitoring device fast response time and can remote monitoring, the sensor fibre grating pair pile body impact of use is very little.
Description
Technical field
The present invention relates to a kind of experimental rig and test method of foundation structure, be specifically related to a kind of pile foundation Dynamic loading test system based on fiber grating and method of testing.
Background technology
In existing correlation engineering, during design, mostly continue to use the Pile Foundations Design method under static(al), seldom consider the impact of vibrating load, can only using bearing capacity as Control Criterion of Design, design as the method for safety stock by significantly improving bearing capacity.In recent years, along with China Express Railway construction develops rapidly, require more and more higher to the high speed of high-speed railway, high-comfort, high security, high density are runed continuously etc., this just proposes stricter requirement to its underpart Foundation Design.When bullet train is passed a bridge, due to dynamic action, pier shaft dynamic response is remarkable, and simultaneously under bullet train load action, its bridge pile foundation must be affected, but relatively less to the dynamic characteristics research of Bored Pile of Bridge under Under Dynamic Load at present.When train is passed a bridge, the actual working state of stake had both been subject to static(al) (dead load) effect, is subject to dynamic action again.In order to intend the quiet dynamic load of dead load and action of traffic loading at stake backform, carry out pile foundation static and dynamic load test and seem particularly important.Due to the deficiency of dynamic load correlation test and theoretical research, at present the understanding of pile foundation carrying and deformation characteristic under dynamic load is also nowhere near, existing evaluation criterion seriously lags behind engineering practice, so far gratifying method for designing is not also had to instruct engineering design, therefore necessary test and the theoretical research carrying out system for the pile foundation characteristic under dynamic loading, deepens the understanding to pile foundation carrying and deformation mechanism under dynamic loading.Due to the simulation relative difficulty of waveform to vibration, can the power loading system of accurate analog multiple waveforms fewer, and can at a high speed, stable, precise monitoring pile foundation sensor is under vibrating conditions also fewer.In order to can pile foundation carrying and deformation under accurate measurements dynamic loading, the design of pile foundation under dynamic load is made more to be tending towards rationality, safety is better, economic indicator is more reasonable, develops a kind of system can monitored pile foundation ess-strain under dynamic loading and have important engineering practice value.
Summary of the invention
Goal of the invention: in order to overcome the deficiencies in the prior art, the invention provides a kind of pile foundation Dynamic loading test system based on fiber grating and method of testing.
Technical scheme: for solving the problems of the technologies described above, the pile foundation Dynamic loading test system based on fiber grating provided by the invention comprises:
Soil holding groove, has the sidewall and diapire be made up of steel concrete;
Reaction frame, comprise the portal trestle of pair of parallel setting, described portal trestle is bolted by channel steel upright post and i iron top rail and forms, and is connected with lower transverse beam in the middle part of the top rail of described a pair portal trestle, and the bottom of described channel steel upright post embeds in the steel concrete sidewall of soil holding groove;
Power charger, comprise backing plate, upper hinge support, lower hinge support and dynamic load bringing device, described backing plate and upper hinge support are secured by bolts in the middle part of lower transverse beam, described dynamic load bringing device comprises hydraulic jack, oil pump, cooling system and control system, described upper hinge support and lower hinge support are installed on the two ends of hydraulic jack respectively, described control system and hydraulic jack control connection, the hydraulic circuit of described oil pump access hydraulic jack, described cooling system is installed on oil pump;
Engineering pile, its pile body embeds in the soil of soil holding groove, and pile body top is fixedly connected with lower hinge support, and pile body surface is provided with sensor fibre, described sensor fibre incoming fiber optic grating dynamic demodulation instrument and data processing and saved system.
During use, the method for testing of above-mentioned pilot system comprises the following steps:
1) use reaction frame, power charger and soil holding groove build pilot system;
2) prefabricated engineering pile surface to be buried the polishings such as underground the position sand paper of sensor fibre clean;
3) epoxy resin be in harmonious proportion in the clean position of polishing is smeared, and smears rear leaving standstill;
4) after epoxy resin to be applied fully solidifies, with Instant cement, stretching sensor fibre is fixed on epoxy resin layer, and then with epoxy resin, the sensor fibre fixed is encapsulated, record position and the length of fiber grating on sensor fibre simultaneously;
5) bottom soil holding groove, lay soil layer, then the engineering pile of pre-buried good fiber grating is put into soil holding groove, then in soil holding groove, the hinged-support of the top of engineering pile with hydraulic jack top/bottom part, to the position of specifying, is connected by layered arrangement soil layer;
6) connect power charger and jack, by power loading system, precompressed is carried out to engineering pile, make the hinged-support close contact of stake top and hydraulic jack top/bottom part;
7) by sensor fibre connecting fiber grating dynamic demodulation instrument, utilize control system to adjust dynamic load, record the data of sensor fibre simultaneously.
Beneficial effect: the pilot system that the present invention adopts and method, reliably can monitor the pile foundation ess-strain under dynamic loading.Owing to adopting sufficient dimension test, the dynamic load loaded is more much smaller than former load, and power charger is fixed on reaction frame by high-strength bolt by this pilot system, and power charger can accurate analog Arbitrary Load and waveform.Wherein, reaction rack equipment adopts steel work, and soil holding groove adopts reinforced concrete structure, forms an entirety, can increase integrally-built stability by the steel concrete that channel-section steel is cast in soil holding groove; And the mid point that a lower transverse beam is connected to two parallel top rails defines I-shaped robust structure, the reaction force of dynamic load can be distributed on the column of two portal trestles equably, the risk of the device damage offseting or tilt to cause occurs after the dynamic load significantly reduced in test applies.And at the hydraulic jack two ends applying dynamic load, hinged-support is all installed, drastically increase the stability of system and the reliability of test data, reduce the difficulty of installing with calibration.Accurately can control Loaded contact analysis in dynamic test process and load by control system and hydraulic jack, simulate multiple vibration wave effect.
The traditional monitoring means at present electric-type foil gauge that adopts monitors pile strain more, there is moisture-sensitive, by deficiencies such as electromagnetic interference, can not the deformation behaviour of Overall Acquisition pile body, and easily damage in dynamic loading test, monitored data is caused to lack, pile body deformation situation cannot be reflected comprehensively, be difficult to the optimal design and the construction that realize stake.If need multianalysis pile body deformation characteristic, then will arrange more sensor, and the wire that sensor extracts is too much, can be pretty troublesome in actual mechanical process.Therefore adopt a kind of stress deformation situation of means monitoring stake easily and effectively particularly important.Fiber Bragg Grating FBG (FiberBraggGrating) technology has the characteristic that transmission unites two into one with sensing medium, the FBG with different pitch is made on same optical fiber diverse location, wavelength-division multiplex technique is adopted to realize the quasi-distributed measurement of stress and temperature, make all to become sensing element along the grating on fiber deployment path, thus realize quasi-distributed measurement.Optical fiber is sensor information, it is again transmission channel, have that volume is little, lightweight, geometry strong adaptability, electromagnetism interference, electrical insulating property are good, highly sensitive, be easy to realize the plurality of advantages such as remote monitoring, the monitoring of pile body dynamic deformation can be applied to.
Accompanying drawing explanation
Fig. 1 is the structural representation of the embodiment of the present invention;
Fig. 2 is the structural representation of the embodiment of the present invention;
Fig. 3 is the sectional drawing of engineering pile in Fig. 1.
Detailed description of the invention
The present invention is described in detail below in conjunction with embodiment.Should be understood that these embodiments are only not used in for illustration of the present invention to limit the scope of the invention.In addition should be understood that those skilled in the art can make various changes or modifications the present invention, and these equivalent form of values fall within the application's appended claims limited range equally after the content of having read the present invention's instruction.
The pile foundation Dynamic loading test system based on fiber grating of the present embodiment as depicted in figs. 1 and 2, comprises reaction frame, power charger and soil holding groove 17.Wherein reaction frame comprises the portal trestle of pair of parallel setting, this portal trestle is formed by connecting by high-strength bolt 14 by channel steel upright post 15 and i iron top rail 1, lower transverse beam 4 connects and the middle part of a pair top rail 1 forms I shape, and the bottom of channel steel upright post 15 and the steel concrete sidewall of soil holding groove 17 are built and formed one.
Power charger, comprise backing plate 2, upper hinge support 5, lower hinge support and dynamic load bringing device, backing plate 2 and upper hinge support 5 are fixed on the middle part of lower transverse beam 4 by the second high-strength bolt 3, dynamic load bringing device comprises hydraulic jack 7, oil pump 8 and cooling system 9, and control system 6.Upper hinge support 5 and lower hinge support are installed on the two ends of hydraulic jack 7 respectively, and control system 6 and hydraulic jack 7 control connection, oil pump 8 accesses the hydraulic circuit of hydraulic jack 7, and 9 systems that cool are installed on oil pump 8.
The pile body of engineering pile 12 embeds in the soil of soil holding groove 17, and pile body top is fixedly connected with lower hinge support.The surface of engineering pile 12 is provided with sensor fibre 13, sensor fibre 13 incoming fiber optic grating dynamic demodulation instrument 11 and data processing and saved system 10.
As shown in Figure 3, the sensor fibre 13 on the surface of engineering pile is packaged in epoxy resin 18, is filled with epoxy resin 18, also wraps up epoxy resin 18 in the outside of sensor fibre 13 between sensor fibre 13 and engineering pile.
During use, the pile foundation Dynamic loading test method based on fiber grating of the present embodiment comprises the following steps:
1) by reaction frame, power charger, soil holding groove and monitoring device are connected to form pilot system.Wherein reaction rack equipment adopts i shaped steel and channel-section steel composition, adopts welding, adopt high-strength bolt to rivet between i shaped steel and channel-section steel between i shaped steel.Channel-section steel is connected with soil holding groove, is cast in bottom channel-section steel among soil holding groove.Power charger is by moving loading control, and dynamic load bringing device, oil pump and cooling unit etc. form.Power charger is connected by backing plate, high-strength bolt and upper hinge support with reaction frame.
2) prefabricated engineering pile surface to be buried the polishings such as underground the position sand paper of fiber grating clean.
3) epoxy resin be in harmonious proportion in the clean position of polishing is smeared, and the width smeared is about 5cm, and thickness is about 2mm.
4) epoxy resin smeared generally will leave standstill 24 hours, after epoxy resin to be applied fully solidifies, with Instant cement, stretching sensor fibre is fixed on epoxy resin layer, and then with epoxy resin, the sensor fibre fixed is encapsulated, record position and the length of fiber grating on sensor fibre, for use in monitoring analysis simultaneously;
5) bottom soil holding groove, lay soil layer, then the engineering pile of pre-buried good fiber grating is put into soil holding groove, then in soil holding groove, the hinged-support of the top of engineering pile with hydraulic jack top/bottom part, to the position of specifying, is connected by layered arrangement soil layer;
6) control system of dynamic load bringing device is connected in hydraulic jack, connect oil pump device and cooling unit simultaneously, dynamic load bringing device is debugged, after all are normal, first by power loading system, precompressed is carried out to engineering pile, make the hinged-support close contact of stake top and hydraulic jack top/bottom part, check that adjusting the load that power charger is applied just in time can be delivered on stake top simultaneously.
7) by sensing connecting fiber grating dynamic demodulation instrument, debug each term coefficient, whether normally to reaffirm loading and monitoring system, if abnormal, then will check each parts connect whether have problem, and whether fiber grating destroys, if normal, can test.Adopt power charger to simulate multiple vibration wave effect, record the data that fiber grating gathers simultaneously.
Claims (1)
1., based on a method of testing for the pile foundation Dynamic loading test system of fiber grating, this pilot system comprises:
Soil holding groove, has the sidewall and diapire be made up of steel concrete;
Reaction frame, comprise the portal trestle of pair of parallel setting, described portal trestle is bolted by channel steel upright post and i iron top rail and forms, and is connected with lower transverse beam in the middle part of the top rail of described a pair portal trestle, and the bottom of described channel steel upright post embeds in the steel concrete sidewall of soil holding groove;
Power charger, comprise backing plate, upper hinge support, lower hinge support and dynamic load bringing device, described backing plate and upper hinge support are secured by bolts in the middle part of lower transverse beam, described dynamic load bringing device comprises hydraulic jack, oil pump, cooling system and control system, described upper hinge support and lower hinge support are installed on the two ends of hydraulic jack respectively, described control system and hydraulic jack control connection, the hydraulic circuit of described oil pump access hydraulic jack, described cooling system is installed on oil pump;
Engineering pile, its pile body embeds in the soil of soil holding groove, and pile body top is fixedly connected with lower hinge support, and pile body surface is provided with sensor fibre, described sensor fibre incoming fiber optic grating dynamic demodulation instrument and data processing and saved system;
It is characterized in that comprising the following steps:
1) use reaction frame, power charger and soil holding groove build pilot system;
2) the position sand papering prefabricated engineering pile surface will being buried underground sensor fibre is clean;
3) epoxy resin be in harmonious proportion in the clean position of polishing is smeared, and smears rear leaving standstill;
4) after epoxy resin to be applied fully solidifies, with Instant cement, stretching sensor fibre is fixed on epoxy resin layer, and then with epoxy resin, the sensor fibre fixed is encapsulated, record position and the length of fiber grating on sensor fibre simultaneously;
5) bottom soil holding groove, lay soil layer, then the engineering pile of pre-buried good fiber grating is put into soil holding groove, then in soil holding groove, the hinged-support of the top of engineering pile with hydraulic jack top/bottom part, to the position of specifying, is connected by layered arrangement soil layer;
6) connect power charger, with power charger, precompressed is carried out to engineering pile, make the hinged-support close contact of stake top and hydraulic jack top/bottom part;
7) by sensor fibre connecting fiber grating dynamic demodulation instrument, utilize control system to adjust dynamic load, record the data of sensor fibre simultaneously.
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| CN201410118137.7A CN103882893B (en) | 2014-03-26 | 2014-03-26 | Based on pile foundation Dynamic loading test system and the method for testing of fiber grating |
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| CN104452835B (en) * | 2014-12-06 | 2016-04-27 | 国家电网公司 | For experimental rig and the method to set up thereof of transmission line foundation test |
| CN106555411B (en) * | 2015-09-30 | 2018-12-04 | 宝山钢铁股份有限公司 | Steel pipe concrete pipe pile high strain monitoring method |
| CN106013276A (en) * | 2016-07-04 | 2016-10-12 | 中国电建集团华东勘测设计研究院有限公司 | Stress-strain testing system for large-diameter steel pipe pile of offshore wind turbine and construction method |
| CN108303325A (en) * | 2018-01-08 | 2018-07-20 | 中国建筑股份有限公司 | A kind of intelligent shaft force loading system using distribution type fiber-optic measuring device |
| CN109811805B (en) * | 2018-12-15 | 2023-09-26 | 浙江工业大学 | Ring type bridge pile foundation scouring monitoring system and monitoring method thereof |
| CN109469125B (en) * | 2019-01-11 | 2024-01-30 | 深圳宏业基岩土科技股份有限公司 | Pile foundation load test device for fiber bragg grating sensing detection and detection method thereof |
| CN109778923B (en) * | 2019-02-27 | 2023-12-08 | 河海大学 | Foundation pile buckling critical load test device and method |
| CN111829594B (en) * | 2020-07-29 | 2023-01-10 | 中铁二院工程集团有限责任公司 | Method for detecting top beam of railway bridge |
| CN113702158B (en) * | 2021-08-31 | 2024-03-22 | 青岛理工大学 | Method and device for accurately collecting data of horizontal loading p-y curve method of rock-socketed pipe pile |
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| JP3641771B2 (en) * | 1997-05-12 | 2005-04-27 | 株式会社竹中工務店 | Method for detecting damage of foundation pile from ground surface and apparatus used for the method |
| CN202543984U (en) * | 2012-02-17 | 2012-11-21 | 中建三局第二建设工程有限责任公司 | Reaction force device with combination of anchor bars and steel beams |
| CN202577378U (en) * | 2012-04-20 | 2012-12-05 | 宏润建设集团股份有限公司 | Single pile static loading test rack |
| CN203049635U (en) * | 2013-03-13 | 2013-07-10 | 中铁西北科学研究院有限公司 | Static loading test quick linking device by anchor pile method |
| CN103485373A (en) * | 2013-10-12 | 2014-01-01 | 青岛理工大学 | Method for testing pile shaft stress of static pressure high-strength pre-stressed concrete pipe pile |
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