CN203479436U - Static pressure high-strength prestressed concrete pipe pile body stress testing device - Google Patents
Static pressure high-strength prestressed concrete pipe pile body stress testing device Download PDFInfo
- Publication number
- 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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- Prior art keywords
- prestressed concrete
- strength prestressed
- pile
- fiber bragg
- bragg grating
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- 239000011513 prestressed concrete Substances 0.000 title claims abstract description 47
- 230000003068 static effect Effects 0.000 title claims abstract description 22
- 238000009662 stress testing Methods 0.000 title 1
- 230000003287 optical effect Effects 0.000 claims abstract description 22
- 238000012360 testing method Methods 0.000 claims abstract description 16
- 239000000835 fiber Substances 0.000 claims abstract description 11
- 239000003822 epoxy resin Substances 0.000 claims abstract description 8
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 8
- 239000002689 soil Substances 0.000 claims abstract description 6
- 238000005520 cutting process Methods 0.000 claims abstract description 4
- 239000013307 optical fiber Substances 0.000 claims description 38
- 238000010276 construction Methods 0.000 claims description 11
- 238000002513 implantation Methods 0.000 claims description 5
- 238000004806 packaging method and process Methods 0.000 claims description 5
- 238000003466 welding Methods 0.000 claims description 5
- 239000003795 chemical substances by application Substances 0.000 claims description 4
- 230000004083 survival effect Effects 0.000 abstract description 10
- 238000012544 monitoring process Methods 0.000 abstract description 3
- 230000035945 sensitivity Effects 0.000 abstract description 3
- 238000005553 drilling Methods 0.000 abstract 2
- 238000009435 building construction Methods 0.000 abstract 1
- 230000004927 fusion Effects 0.000 abstract 1
- 239000007788 liquid Substances 0.000 abstract 1
- 238000005259 measurement Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 description 5
- 239000000203 mixture Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000035515 penetration Effects 0.000 description 3
- 239000004567 concrete Substances 0.000 description 2
- 238000005538 encapsulation Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000011888 foil Substances 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 238000010923 batch production Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000000703 high-speed centrifugation Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
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Abstract
The utility model belongs to the technical field of building construction stress test equipment, a static pressure high-strength prestressed concrete tubular pile body stress test device is related to, the cutting system has the shallow slot in the high-strength prestressed concrete tubular pile, optic fibre Bragg grating sensor and armor optical cable are according to the butt fusion of the quasi-distribution type and are established ties, the optic fibre Bragg grating sensor and the armor optical cable of establishing ties are implanted in the shallow slot of the high-strength prestressed concrete tubular pile and are encapsulated and protected with the epoxy resin mixed liquid, the optic fibre Bragg grating sensor is laid according to the soil layer elevation that needs the test in the position of the high-strength prestressed concrete tubular pile; a pile body drilling hole is formed in the inner side of the top of the high-strength prestressed concrete pipe pile, and the armored optical cable is led out through the pile body drilling hole and communicated with a data acquisition system; the device has the advantages of simple structure, convenient operation, high measurement precision, high sensitivity, strong anti-electromagnetic field interference capability and high survival rate, and is easy to realize quasi-distributed and automatic monitoring compared with the traditional force measuring element.
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 | Static pressure high-strength prestressed concrete pipe pile body stress testing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320628409.9U CN203479436U (en) | 2013-10-12 | 2013-10-12 | Static pressure high-strength prestressed concrete pipe pile body stress testing device |
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| Publication Number | Publication Date |
|---|---|
| CN203479436U true CN203479436U (en) | 2014-03-12 |
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|---|---|---|---|
| CN201320628409.9U Expired - Fee Related CN203479436U (en) | 2013-10-12 | 2013-10-12 | Static pressure high-strength prestressed concrete pipe pile body stress testing device |
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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 | Static pressure high-strength prestressed concrete pipe pile body stress testing device |
| 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 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 | Static pressure high-strength prestressed concrete pipe pile body stress testing device |
| 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 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 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 |