CN203479436U - Pile body stress test apparatus for static-pressure prestressed high-strength concrete pile - Google Patents
Pile body stress test apparatus for static-pressure prestressed high-strength concrete pile Download PDFInfo
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- CN203479436U CN203479436U CN201320628409.9U CN201320628409U CN203479436U CN 203479436 U CN203479436 U CN 203479436U CN 201320628409 U CN201320628409 U CN 201320628409U CN 203479436 U CN203479436 U CN 203479436U
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- pile
- fiber bragg
- prestressed concrete
- strength prestressed
- optical fiber
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Abstract
The utility model belongs to the technical field of construction stress test equipment, and relates to a pile body stress test apparatus for a static-pressure prestressed high-strength concrete pile. A shallow groove is formed by cutting the inside of the prestressed high-strength concrete pile. A fiber Bragg grating sensor and an armored cable are connected in series in a quasi-distributed manner and then are planted into the shallow groove of the prestressed high-strength concrete pile and are packaged for protection by using an epoxy resin mixture. The fiber Bragg grating sensor is arranged at a position in the prestressed high-strength concrete pile according to the elevation of a soil layer under test. The inside of the top of the prestressed high-strength concrete pile is provided with a pile body borehole. The armored cable is led out through the pile body borehole and then is communicated with a data acquisition system. The pile body stress test apparatus is simple in structure, convenient for operation and high in measurement precision and sensitivity, has strong resistance to electromagnetic interference and high rate of survival, and is easier to reliable the quasi-distributed automatic monitoring compared to a conventional stress measuring component.
Description
Technical field:
The utility model belongs to building operation stress test equipment technical field, relate to the prefabricated pile pile stress test equipment that adopts static pressure construction in a kind of ground and foundation works, particularly a kind of static pressure high-strength prestressed concrete pipe pile pile stress test device.
Background technology:
Especially high-strength prestressed concrete (PHC) pile tube has that load-bearing capacity is high to concrete precast pile, batch production is produced, firm durable, speed of application fast, can effectively save the advantages such as building materials and construction costs, Static piling construction noiselessness, shake little, less to surrounding environment influence, be suitable for urban district, there is precision equipment area and other require high area construction to construction environment, compare with hammering method construction, quasistatic pile driving pressure can guarantee penetration process pile integrality; Produce a large amount of discarded slurries with bored pile construction and compare, construction of Static Pressure Pile is environmental protection more, pollution-free; The separation majority of Sinking Pile Resistance of Static Press Pile is to obtain end resistance and pile side friction by load-sensing unit, load-sensing unit is subject to the impact of test environment, so improving load-sensing unit survival rate is the key of site test success or failure, for PHC pile tube, in pile body outside, pasting resistance strain plate is easily damaged by all native friction force of stake, if at the inner foil gauge that pastes of pile body, because pile tube internal diameter is little, not easy to operate, and tube chamber is easily intake, be subject to such environmental effects large, precise decreasing, reliability and survival rate are not high; Strain-type reinforcement stresses is taken into account type vibration wire reinforcement stresses, and to haggle over foil gauge stable, but the production run temperature of pile tube is high, use high temperature strain gauge, and cost is high and survival rate is low; High-strength prestressed concrete pipe pile is different from the stake types such as square pile, steel-pipe pile; himself production technology and feature have objectively caused the difficulty of testing experiment; and the technique such as reinforced bar stretching in production run, pre-pouring concrete, high speed centrifugation rotation and High Temperature Curing causes very large inconvenience to the pre-buried load-sensing unit of pile body; because optical fiber is very thin and weak; to sensor and Transmission Fibers, must carry out careful protection, how at the scene the key of Fibre Optical Sensor in-situ monitoring success or failure is that in extensive job execution environment, realizing burying underground of sensor locates and guarantee its survival rate.
Summary of the invention:
Goal of the invention of the present utility model is to overcome the shortcoming of prior art, under the prerequisite not raising the cost, seek design a kind of static pressure high-strength prestressed concrete pipe pile pile stress test device is provided, when optical fiber Bragg raster (FBG) sensor under tension or pressure-acting, the elongation of sensor or compression change the fiber grating cycle, and then the effective refractive index of change FBG sensor, according to the axial strain of a certain section of high-strength prestressed concrete (PHC) pile tube, draw the pile body stress of static pressure high-strength prestressed concrete (PHC) pile tube, thereby obtain pile body axle power, side friction and end resistance.
In order to achieve the above object, agent structure of the present utility model comprises high-strength prestressed concrete (PHC) pile tube, optical fiber Bragg raster (Fiber Bragg Grating is called for short FBG) sensor, armored optical cable, data acquisition system (DAS) and pile body boring; Adopt high-strength prestressed concrete (PHC) the pile tube internal cutting of static pressure construction to be shaped with shallow slot, optical fiber Bragg grating sensor and armored optical cable are by quasi-distributed welding series connection, in the shallow slot of the optical fiber Bragg grating sensor of series connection and armored optical cable implantation high-strength prestressed concrete (PHC) pile tube, also with epoxy resin mixed liquor, carry out packaging protection, the soil layer absolute altitude that optical fiber Bragg grating sensor is tested as required in the position of high-strength prestressed concrete (PHC) pile tube is laid; The inside top of high-strength prestressed concrete (PHC) pile tube is opened and is shaped with pile body boring, and armored optical cable is holed to draw with data acquisition system (DAS) by pile body and is communicated with, the fiber Bragg grating (FBG) demodulator that data acquisition system adopted is commercially available.
The specific embodiment that the utility model completes stress test is:
(1), at the outer wall of high-strength prestressed concrete (PHC) pile tube along the standardized straight line of axis, then along the straight cuts shallow slot pulling, and in shallow slot, determine the implantation position of optical fiber Bragg raster (FBG) sensor according to the position of test rock-soil layer, the two ends of optical fiber Bragg raster (FBG) sensor distance high-strength prestressed concrete (PHC) pile tube all reserve the distance of 25cm, avoid the metal end plate of high-strength prestressed concrete (PHC) pile tube;
(2), according to the position of optical fiber Bragg raster (FBG) sensor, optical fiber Bragg raster (FBG) sensor and armored optical cable are together in series by quasi-distributed welding, after being implanted at shallow slot optical fiber Bragg raster (FBG) sensor connecting, use epoxy resin composition packaging protection, armored optical cable is holed and is drawn by pile body;
(3), with epoxy resin composition encapsulation, after two hours, check the survival rate of optical fiber Bragg raster (FBG) sensor after optical fiber Bragg raster (FBG) sensor that connects, survival rate is not less than 90%;
(4), with rotary crane, lift by crane high-strength prestressed concrete (PHC) pile tube, the clip pile machine hole that makes high-strength prestressed concrete (PHC) pile tube fall into static pile press enters working position, and the armored optical cable access data acquisition system that pile body boring is drawn, whether checkout facility connects intact;
(5), the pile ring of static pile press clamps high-strength prestressed concrete (PHC) pile tube, the dowel pressing cylinder piston of dependence static pile press is realized the injection of high-strength prestressed concrete (PHC) pile tube, in penetration process, the wavelength variations of recording light fiber Bragg grating (FBG) sensor and the pile driving pressure of static pile press, utilize formula Δ λ
b=Δ λ
b ε+ Δ λ
b t=λ
b(Κ
εΔ ε
x+ Κ
tΔ t) STRESS VARIATION of inverse high-strength prestressed concrete (PHC) pile tube, thus pile body axle power, side friction and the end resistance of high-strength prestressed concrete (PHC) pile tube obtained, wherein, Δ λ
boptical fiber Bragg raster (FBG) center sensor wavelength variable quantity during for strain and temperature acting in conjunction; Δ λ
b εduring for optical fiber Bragg raster (FBG) sensor under tension or pressure-acting, center wavelength variation amount; Δ λ
b twhile changing for temperature, optical fiber Bragg raster (FBG) center sensor wavelength variable quantity; λ
bfor not being subject to external force, temperature, it is the initial wavelength of 0 o'clock grating; Κ
εfor optical fiber Bragg raster (FBG) strain transducer sensitivity coefficient; Δ
ε xfor axial strain change amount; Κ t is optical fiber Bragg raster (FBG) sensor temperature sensitivity coefficient; Δ
tfor temperature variation.
Compared with prior art, its apparatus structure is simple, easy to operate for the utility model, and measuring accuracy is high, highly sensitive, and anti-electromagnetic field interference performance is strong, and survival rate is high, compares and is easy to realize quasi-distributed and automatic monitoring with traditional load-sensing unit.
Accompanying drawing explanation:
Fig. 1 is agent structure principle schematic of the present utility model.
Fig. 2 is the plan structure principle schematic of the FBG sensor that relates to of the utility model in PHC pile tube.
Embodiment:
Below by embodiment, also by reference to the accompanying drawings the utility model is described in further detail.
Embodiment:
The agent structure of the present embodiment comprises high-strength prestressed concrete (PHC) pile tube 1, optical fiber Bragg raster (Fiber Bragg Grating is called for short FBG) sensor 2, armored optical cable 3, data acquisition system (DAS) 4 and pile body boring 5; Adopt high-strength prestressed concrete (PHC) pile tube 1 internal cutting of static pressure construction to be shaped with shallow slot, optical fiber Bragg grating sensor 2 and armored optical cable 3 are by quasi-distributed welding series connection, in the shallow slot of the optical fiber Bragg grating sensor 2 of series connection and armored optical cable 3 implantation high-strength prestressed concrete (PHC) pile tubes 1, also with epoxy resin mixed liquor, carry out packaging protection, the soil layer absolute altitude that optical fiber Bragg grating sensor 2 is tested as required in the position of high-strength prestressed concrete (PHC) pile tube 1 is laid; The inside top of high-strength prestressed concrete (PHC) pile tube 1 is opened and is shaped with pile body boring 5, and armored optical cable 3 hole and 5 drawn with data acquisition system (DAS) 4 and be communicated with, the commercially available fiber Bragg grating (FBG) demodulator of data acquisition system (DAS) 4 employing by pile body.
The specific embodiment that the present embodiment completes stress test is:
(1), at the outer wall of high-strength prestressed concrete (PHC) pile tube 1 along the standardized straight line of axis, then along the straight cuts shallow slot pulling, and in shallow slot, determine the implantation position of optical fiber Bragg raster (FBG) sensor 2 according to the position of test rock-soil layer, optical fiber Bragg raster (FBG) sensor 2 all reserves the distance of 25cm apart from the two ends of high-strength prestressed concrete (PHC) pile tube 1, avoid the metal end plate of high-strength prestressed concrete (PHC) pile tube 1;
(2), according to the position of optical fiber Bragg raster (FBG) sensor 2, optical fiber Bragg raster (FBG) sensor 2 and armored optical cable 3 are together in series by quasi-distributed welding, at shallow slot, be implanted into the rear epoxy resin composition packaging protection of using of optical fiber Bragg raster (FBG) sensor 2 connecting, armored optical cable 3 is holed and 5 is drawn by pile body;
(3), optical fiber Bragg raster (FBG) sensor 2 that connects is rear with epoxy resin composition encapsulation, after 2 hours, checks the survival rate of optical fiber Bragg raster (FBG) sensor 2, survival rate is not less than 90%;
(4), with rotary crane, lift by crane high-strength prestressed concrete (PHC) pile tube 1, the clip pile machine hole that makes high-strength prestressed concrete (PHC) pile tube 1 fall into static pile press enters working position, and by pile body boring 5 armored optical cable of drawing 3 access data acquisition systems 4, whether checkout facility connects intact;
(5), the pile ring of static pile press clamps high-strength prestressed concrete (PHC) pile tube 1, the dowel pressing cylinder piston of dependence static pile press is realized the injection of high-strength prestressed concrete (PHC) pile tube 1, in penetration process, the wavelength variations of recording light fiber Bragg grating (FBG) sensor 2 and the pile driving pressure of static pile press, utilize formula Δ λ
b=Δ λ
b ε+ Δ λ
b t=λ
b(Κ
εΔ ε
x+ Κ
tΔ t) STRESS VARIATION of inverse high-strength prestressed concrete (PHC) pile tube 1, thus pile body axle power, side friction and the end resistance of high-strength prestressed concrete (PHC) pile tube 1 obtained, wherein, Δ λ
boptical fiber Bragg raster (FBG) sensor 2 center wavelength variation amounts during for strain and temperature acting in conjunction; Δ λ
b εduring for optical fiber Bragg raster (FBG) sensor 2 under tensions or pressure-acting, center wavelength variation amount; Δ λ
b twhile changing for temperature, optical fiber Bragg raster (FBG) sensor 2 center wavelength variation amounts; λ Δ is the initial wavelength of 0 o'clock grating for not being subject to external force, temperature; Κ
εfor optical fiber Bragg raster (FBG) sensor 2 gage factors; Δ
ε xfor axial strain change amount; Κ
tfor optical fiber Bragg raster (FBG) sensor 2 temperature-sensitivity coefficients; Δ
tfor temperature variation.
Claims (1)
1. a static pressure high-strength prestressed concrete pipe pile pile stress test device, is characterized in that agent structure comprises high-strength prestressed concrete pipe pile, optical fiber Bragg grating sensor, armored optical cable, data acquisition system (DAS) and pile body boring; Adopt the high-strength prestressed concrete pipe pile internal cutting of static pressure construction to be shaped with shallow slot, optical fiber Bragg grating sensor and armored optical cable are by quasi-distributed welding series connection, in the shallow slot of the optical fiber Bragg grating sensor of series connection and armored optical cable implantation high-strength prestressed concrete pipe pile, also with epoxy resin mixed liquor, carry out packaging protection, the soil layer absolute altitude that optical fiber Bragg grating sensor is tested as required in the position of high-strength prestressed concrete pipe pile is laid; The inside top of high-strength prestressed concrete pipe pile is opened and is shaped with pile body boring, and armored optical cable is holed to draw with data acquisition system (DAS) by pile body and is communicated with, the fiber Bragg grating (FBG) demodulator that data acquisition system adopted is commercially available.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320628409.9U CN203479436U (en) | 2013-10-12 | 2013-10-12 | Pile body stress test apparatus for static-pressure prestressed high-strength concrete pile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320628409.9U CN203479436U (en) | 2013-10-12 | 2013-10-12 | Pile body stress test apparatus for static-pressure prestressed high-strength concrete pile |
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| Publication Number | Publication Date |
|---|---|
| CN203479436U true CN203479436U (en) | 2014-03-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320628409.9U Expired - Fee Related CN203479436U (en) | 2013-10-12 | 2013-10-12 | Pile body stress test apparatus for static-pressure prestressed high-strength concrete pile |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103512686A (en) * | 2013-10-12 | 2014-01-15 | 青岛理工大学 | Pile body stress testing device of static-pressure high-strength pre-stress concrete pipe pile |
| CN104677422A (en) * | 2015-03-03 | 2015-06-03 | 哈尔滨理工大学 | Method and equipment for performing multi-field test on sandy soil embankment in cold region by utilizing fiber Bragg grating |
| CN105200971A (en) * | 2015-10-22 | 2015-12-30 | 青岛理工大学 | Device and method for testing pile-soil interface soil pressure and pore water pressure |
| CN110863815A (en) * | 2019-11-26 | 2020-03-06 | 中国矿业大学 | Method for monitoring ecological water source disturbance caused by overburden mining abscission layer expansion and barrier |
-
2013
- 2013-10-12 CN CN201320628409.9U patent/CN203479436U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103512686A (en) * | 2013-10-12 | 2014-01-15 | 青岛理工大学 | Pile body stress testing device of static-pressure high-strength pre-stress concrete pipe pile |
| CN104677422A (en) * | 2015-03-03 | 2015-06-03 | 哈尔滨理工大学 | Method and equipment for performing multi-field test on sandy soil embankment in cold region by utilizing fiber Bragg grating |
| CN104677422B (en) * | 2015-03-03 | 2017-08-29 | 中国地震局工程力学研究所 | Many method of testings and equipment are carried out using the cold area's sandy soil embankment of fiber grating pair |
| CN105200971A (en) * | 2015-10-22 | 2015-12-30 | 青岛理工大学 | Device and method for testing pile-soil interface soil pressure and pore water pressure |
| CN105200971B (en) * | 2015-10-22 | 2017-01-18 | 青岛理工大学 | Device and method for testing pile-soil interface soil pressure and pore water pressure |
| CN110863815A (en) * | 2019-11-26 | 2020-03-06 | 中国矿业大学 | Method for monitoring ecological water source disturbance caused by overburden mining abscission layer expansion and barrier |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140312 Termination date: 20191012 |
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| CF01 | Termination of patent right due to non-payment of annual fee |