CN109837931A - Wisdom prefabricated pile - Google Patents
Wisdom prefabricated pile Download PDFInfo
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- CN109837931A CN109837931A CN201910082370.7A CN201910082370A CN109837931A CN 109837931 A CN109837931 A CN 109837931A CN 201910082370 A CN201910082370 A CN 201910082370A CN 109837931 A CN109837931 A CN 109837931A
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- optical fiber
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- prefabricated pile
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Abstract
The present invention provides a kind of wisdom prefabricated pile, hybrid optical fiber (3) are equipped in pile body (1), hybrid optical fiber (3) includes being arranged in the first optical fiber (31) and the second optical fiber (32) that monitor strain inside pile body on reinforcing bar, wherein, the entire optical fiber of first optical fiber (31) is close to reinforcing bar, binding is used for temperature-compensating on the steel mesh of prefabricated pile inside side by side for second optical fiber (32) and the first optical fiber (31).Meanwhile pile body surface is equipped with locator (2) and inquires the two dimensional code (4) of the material structure information of prefabricated pile.
Description
Technical field
The present invention relates to wisdom prefabricated piles.
Background technique
The stability of prefabricated pile is directly related to the safety of superstructure, must in order to ensure the safe handling of superstructure
Prefabricated pile must be monitored, to determine its health status.Since the disease of prefabricated pile is mainly manifested in stress damage and deformation
On larger, so it is very necessary for carrying out comprehensive health monitoring to prefabricated pile.
With reference to Fig. 1, in the patent document of publication number CN105155595A, discloses prefabricated pile resistance to compression detection method: excavating
The top for exposing prefabricated pile behind ground, places lifting body on the top of prefabricated pile, and it is prefabricated to place resistance to compression above lifting body
Part, resistance to compression prefabricated component are fixedly connected with the ground, starting lifting body make the both ends of lifting body hold out against respectively resistance to compression prefabricated component and
Prefabricated pile continues the power for applying raising to lifting body, when the pressure value of lifting body reaches the qualified resistance to compression value of prefabricated pile
When prefabricated pile do not sink, show that the resistance to compression value of prefabricated pile is qualified, otherwise resistance to compression value is unqualified.
In the patent document of publication number CN103215973A, the method for measurement precast pile inclination is disclosed: 1, in prefabricated pile
Top sets a notch, and prefabricated pile will test transmitter and hang on notch after ground is vertical surely；2, detection transmitter is cuboid,
An accelerometer is filled respectively on two vertical planes of cuboid inner wall；3, it opens detection sender-switch and measures precast pile inclination
State is opened mobile receiver matched with detection transmitter and is switched, and the information that detection transmitter is sent is received；4, three movements connect
It receives device and receives the data that detection transmitter is sent, base-pile tilt direction θ is read by the dial plate on mobile receiver, from display
Upper reading base-pile tilt angle ɑ；5, to continuing to squeeze into prefabricated pile after prefabricated pile well straightening, the detection transmitter hung on prefabricated pile connects fastly
It is removed before the touching soil body, is detected for next construction of prefabricated piles.
Can be seen that existing prefabricated pile detection method, it is common that prefabricated pile is detected before being driven underground in earth's surface,
The purpose of detection is not achieved in construction in later period process and operation phase.
Summary of the invention
The present invention provides a kind of wisdom prefabricated pile, and the hybrid optical fiber of monitoring strain, hybrid optical fiber packet are equipped in pile body
Include the first optical fiber and the second optical fiber.First optical fiber is tightly attached to inside pile body on reinforcing bar.Second fiber slack the first light is set
On the reinforcing bar that fibre is close to, the second optical fiber trend is consistent with the first optical fiber, compensates to strain caused by temperature.
The grating string of the monitoring horizontal amount of deflection of pile body is carved on above-mentioned wisdom prefabricated pile, the first optical fiber.
In above-mentioned wisdom prefabricated pile, degree of the disturbing ω (x) are as follows:ε (x) is strain, and y is grating
It goes here and there to prefabricated pile central axis distance.
In above-mentioned wisdom prefabricated pile, pile body is equipped with locator, can position in complex situations to pile body, favorably
In prefabricated pile the construction time and operation the phase efficient detection.
In above-mentioned wisdom prefabricated pile, the surface of pile body is equipped with the two dimensional code of the material structure information of inquiry prefabricated pile.
The present invention may be implemented to prefabricated pile the construction time and operation the phase comprehensive detection.
Detailed description of the invention
The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
Fig. 1 shows the resistance to compression structure diagram of detection device of prefabricated pile.
Fig. 2 shows the distribution maps of each device in wisdom prefabricated pile of the present invention.
Specific embodiment
Fig. 2 has gone out wisdom prefabricated pile, and the pile body 1 of the prefabricated pile can be square pile or circle stake, and can reserve near pile cover
Wiring hole.Locator 2 is installed on pile body 1, pile body 1 is positioned in complex situations, is conducive to prefabricated pile in the construction time
With the efficient detection of operation phase, locator 2 can be removed after pile body 1 is embedded to underground.It is arranged on bar construction inside prefabricated pile
Have hybrid optical fiber 3, hybrid optical fiber 3 connects portable (FBG) demodulator and parses to the data of monitoring, may be implemented strain and
The monitoring of displacement.The data of (FBG) demodulator parsing can be transferred to computer.Prefabricated pile surface is equipped with two dimensional code 4, and two dimensional code is stored with
The information such as material, the structure of prefabricated pile, for can be obtained the material of prefabricated pile after field technician or inspection personnel's barcode scanning
The information such as material, structure.
Hybrid optical fiber 3 includes the first optical fiber 31 and the second optical fiber 32 of monitoring 1 internal strain of pile body, and is engraved on first
The grating string 33 of the horizontal amount of deflection of pile body 1 is monitored on optical fiber 31.First optical fiber 31 is tightly attached on bar construction, is in tight state,
Its measured strain includes strain caused by temperature.The second optical fiber is arranged on the reinforcing bar that the first optical fiber 31 is close in the present invention
32.Second optical fiber 32 trend is consistent with the first optical fiber 31, but only by limited point bindings several on the second optical fiber 32 in reinforcing bar
On, it is in a kind of relaxed state, on the whole to detect temperature individually caused strain.First optical fiber, 31 bilateral symmetry position, away from
4 grating strings 33 are laid altogether at stake bottom and pile cover equidistance.Grating string 33 is connected by the first optical fiber 31.
The method for calculating prefabricated pile strain value using the first optical fiber 31 and the second optical fiber 32 is as follows:
The surveyed strain value of first optical fiber 31 can directly read as ε by (FBG) demodulatorSi, strain caused by same position temperature can be by
Second optical fiber 32 is measured as εTi, directly with the surveyed numerical value ε of the first optical fiber 31SiSubtract the surveyed numerical value of the second optical fiber of corresponding position 32
The as strain value ε of the pointi, εi=εSi-εTi(1)。
The method for calculating prefabricated pile amount of deflection is as follows:
Prefabricated pile is reduced to cylindrical rigid body, bottom end is fixed, and top can be had three kinds by pile body when load and be answered
Variation: first is that strain stress of the pile body by curved generationM；Second is that the strain stress that pile body is generated by axial forceF；Third is that pile body is by temperature shadow
Ring the strain stress generatedT.Amount of deflection is related with the strain by curved generation, all consideration εM.Calculate thinking are as follows: first calculated bending moment and answer
Relational expression, the relational expression of moment of flexure and amount of deflection of change can must strain and the relational expression of amount of deflection after then eliminating moment of flexure.It is specific to calculate
Process is as follows:
Strain definition:
In formula (2): ε is strain, and ρ is radius of curvature, and y is grating string to prefabricated pile neutral axis distance.
Radius of curvature and moment of flexure relationship are as follows:
In formula (3): M is moment of flexure, and E is Young's modulus, and I is cross sectional moment of inertia, and EI is bending stiffness.
It can be obtained by formula (2) and formula (3):
Curvature radius formula are as follows:
It can be obtained by formula (3) and formula (5):
In formula (6):When amount of deflection very little: tan θ ≈ θ ≈ 0.
So:
That is:
Deflection value can be obtained to formula (8) quadratic integral:
In formula (9): ω (x) is the amount of deflection of prefabricated pile, and C is the initial corner at prefabricated pile stake bottom, and D is the first of prefabricated pile stake bottom
Begin to be displaced.
Assumed condition based on prefabricated pile, the initial corner and initial displacement at prefabricated pile stake bottom are all zero, so:
It can be obtained by formula (4) and formula (10):
In formula (11), along prefabricated pile axis direction linear distribution, strain formula is substituted into formula (11) can be obtained ε (x)
The sag curve of prefabricated pile.
Claims (5)
1. a kind of wisdom prefabricated pile, which is characterized in that be equipped with the hybrid optical fiber (3) of monitoring strain, hybrid light in pile body (1)
Fine (3) include the first optical fiber (31) and the second optical fiber (32), and the first optical fiber (31) is tightly attached on the internal reinforcing bar of pile body (1), and second
Optical fiber (32) is loosely arranged on the reinforcing bar that the first optical fiber (31) is close to, the second optical fiber (32) trend and the first optical fiber (31)
Unanimously.
2. wisdom prefabricated pile according to claim 1, which is characterized in that be carved with monitoring pile body (1) on the first optical fiber (31)
The grating string (33) of horizontal amount of deflection.
3. wisdom prefabricated pile according to claim 2, which is characterized in that degree of the disturbing ω (x) are as follows:ε (x) is strain, and y is that grating string (33) arrive prefabricated pile central axis distance.
4. wisdom prefabricated pile according to claim 1, which is characterized in that pile body (1) is equipped with locator (2).
5. wisdom prefabricated pile according to claim 1, which is characterized in that the surface of pile body (1) is equipped with inquiry prefabricated pile
The two dimensional code (4) of material structure information.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910082370.7A CN109837931A (en) | 2019-01-28 | 2019-01-28 | Wisdom prefabricated pile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910082370.7A CN109837931A (en) | 2019-01-28 | 2019-01-28 | Wisdom prefabricated pile |
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| Publication Number | Publication Date |
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| CN109837931A true CN109837931A (en) | 2019-06-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910082370.7A Pending CN109837931A (en) | 2019-01-28 | 2019-01-28 | Wisdom prefabricated pile |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111005363A (en) * | 2019-12-03 | 2020-04-14 | 河海大学 | Spliced snowflake type steel sheet pile capable of monitoring self deformation and construction method thereof |
| CN111609952A (en) * | 2020-05-28 | 2020-09-01 | 机械工业勘察设计研究院有限公司 | Calibration device and method for testing pile foundation internal force by line measurement method |
| CN113465577A (en) * | 2020-03-30 | 2021-10-01 | 上海三航奔腾海洋工程有限公司 | Precast pile inclination angle measuring device |
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| US20120004546A1 (en) * | 2009-12-22 | 2012-01-05 | Wolfgang Neuberger | System and Method for Treating Hemorrhoids |
| CN104374433A (en) * | 2014-12-12 | 2015-02-25 | 东南大学 | Tunnel structure monitoring system and tunnel structure monitoring method based on distributed long-gauge fiber bragg grating |
| CN205242290U (en) * | 2015-12-14 | 2016-05-18 | 张国宁 | Road construction is with intelligence location road pile |
| CN106677231A (en) * | 2016-12-13 | 2017-05-17 | 河海大学 | Refined measurement method for pile body deformation of cast-in-place pile |
| CN107643138A (en) * | 2017-09-30 | 2018-01-30 | 青岛理工大学 | A kind of miniature steel pipe pile pile stress test device |
| CN208240066U (en) * | 2018-04-04 | 2018-12-14 | 广州一洲信息技术有限公司 | A kind of concrete prefabricated element quality monitoring identity device |
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2019
- 2019-01-28 CN CN201910082370.7A patent/CN109837931A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120004546A1 (en) * | 2009-12-22 | 2012-01-05 | Wolfgang Neuberger | System and Method for Treating Hemorrhoids |
| CN104374433A (en) * | 2014-12-12 | 2015-02-25 | 东南大学 | Tunnel structure monitoring system and tunnel structure monitoring method based on distributed long-gauge fiber bragg grating |
| CN205242290U (en) * | 2015-12-14 | 2016-05-18 | 张国宁 | Road construction is with intelligence location road pile |
| CN106677231A (en) * | 2016-12-13 | 2017-05-17 | 河海大学 | Refined measurement method for pile body deformation of cast-in-place pile |
| CN107643138A (en) * | 2017-09-30 | 2018-01-30 | 青岛理工大学 | A kind of miniature steel pipe pile pile stress test device |
| CN208240066U (en) * | 2018-04-04 | 2018-12-14 | 广州一洲信息技术有限公司 | A kind of concrete prefabricated element quality monitoring identity device |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111005363A (en) * | 2019-12-03 | 2020-04-14 | 河海大学 | Spliced snowflake type steel sheet pile capable of monitoring self deformation and construction method thereof |
| CN113465577A (en) * | 2020-03-30 | 2021-10-01 | 上海三航奔腾海洋工程有限公司 | Precast pile inclination angle measuring device |
| CN111609952A (en) * | 2020-05-28 | 2020-09-01 | 机械工业勘察设计研究院有限公司 | Calibration device and method for testing pile foundation internal force by line measurement method |
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Application publication date: 20190604 |