CN207231407U - Deeply mixing cement-soil pile measuring system - Google Patents
Deeply mixing cement-soil pile measuring system Download PDFInfo
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- CN207231407U CN207231407U CN201721119188.7U CN201721119188U CN207231407U CN 207231407 U CN207231407 U CN 207231407U CN 201721119188 U CN201721119188 U CN 201721119188U CN 207231407 U CN207231407 U CN 207231407U
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- fiber grating
- mixing cement
- measuring system
- soil pile
- deeply mixing
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Abstract
It the utility model is related to a kind of deeply mixing cement-soil pile measuring system.The purpose of this utility model be to provide it is a kind of it is simple in structure, displacement measurement accuracy is high, interference from human factor is small, the deeply mixing cement-soil pile measuring system of temperature self-compensation, to realize that automation remote monitors in real time, with good economic efficiency and social benefit.The technical solution of the utility model is：A kind of deeply mixing cement-soil pile measuring system, it is characterised in that：Including displacement measuring device, which has tube body, and fiber grating string on it is axially pasted along tube body, and the fiber grating string on displacement measuring device is sequentially connected fiber grating and reconciles instrument and computer.The utility model is suitable for the measurement of the geotechnical engineering deeply mixing cement-soil piles such as dam, tunnel, side slope and foundation pit.
Description
Technical field
It the utility model is related to a kind of deeply mixing cement-soil pile measuring system.Suitable for dam, tunnel, side slope and foundation pit isolith
Geotechnological journey deeply mixing cement-soil pile measurement.
Background technology
Foundation pit lateral deformation observation is a most directly perceived and effective method in the monitoring of Support of Foundation Pit Excavation work progress,
Have conclusive rapid to the safety of deep basal pit and accurately react.With the development of science and technology, to observation instrument and system
The requirement of higher is proposed, in addition to obtaining initial data using artificial observation, automatic monitoring should be able to be also realized, so as to timely
Grasp engineering safety situation and make corresponding decision-making, this is also the direction of project security monitoring System Development.
Instrument currently used for the measurement of Rock soil Foundation deep soil movement is mainly clinograph, it is with being suitable for various ground
The measurement of base horizontal displacement.Existing inclinometer exist measure be limited in scope, instrument price is expensive, maintenance is not easy, safety prison
Heavy workload, test result are surveyed there are certain systematic error and human error, these will all influence safety in production and bursting tube
Reason is horizontal.
The content of the invention
The technical problems to be solved in the utility model is：For above-mentioned problem, there is provided a kind of simple in structure, displacement
High certainty of measurement, interference from human factor are small, the deeply mixing cement-soil pile measuring system of temperature self-compensation, to realize automation remote
Monitoring in real time, with good economic efficiency and social benefit.
Technical solution is used by the utility model：A kind of deeply mixing cement-soil pile measuring system, it is characterised in that：Including
Displacement measuring device, the displacement measuring device have tube body, and fiber grating string on it, displacement are axially pasted along tube body
Fiber grating string in measuring device is sequentially connected fiber grating and reconciles instrument and computer.
The fiber grating string is connected between reconciling instrument with the fiber grating through armored optical cable and FC optical cable jumpers, armouring
Optical cable one end connects fiber grating string, other end connection FC optical cable jumpers.
The fiber grating string has two strings, and two string fiber grating strings are symmetrically arranged on the tube body.
The fiber grating string is in series by 8 fiber-optic grating sensors, 1540~1554nm of centre wavelength, between wavelength
It is divided into 2nm.
The tube body is formed by connecting by multiple pvc pipes, is connected between adjacent two pvc pipe using connector.
The beneficial effects of the utility model are：The utility model, as sensing element, passes through perception using fiber grating string
The strain of tube surfaces, and realize that automation remote is measured and managed by fiber grating conciliation instrument and computer.This practicality is new
Type is symmetrically installed two string fiber grating strings and is tested, and eliminates influence of the temperature to test result, it is possible to achieve temperature is self-complementary
Repay.
Brief description of the drawings
Fig. 1 is the structure diagram of the present embodiment.
Fig. 2 is the schematic diagram of displacement measuring device in embodiment.
Fig. 3 is the sectional view of displacement measuring device in embodiment.
Fig. 4 is the A portions enlarged drawing of Fig. 3.
Fig. 5 is the sectional view of displacement measuring device in embodiment.
Embodiment
As shown in Fig. 1~Fig. 5, the present embodiment is a kind of deeply mixing cement-soil pile measuring system, including displacement measuring device, should
Displacement measuring device has tube body, and fiber grating string 2 is axially pasted along tube body, using fiber grating string 2 as sensing element, perceives
The strain of tube surfaces, produces corresponding wavelength.Its middle tube body is formed by connecting by multiple pvc pipes 1, is adopted between adjacent two pvc pipe
Connected with connector 5.Fiber grating string 2 on displacement measuring device is successively through 4 fiber grating of armored optical cable 3 and FC optical cable jumpers
Instrument 8 is reconciled, fiber grating reconciles instrument 8 and connects computer 9, realizes that automation remote is measured and managed.
This example is symmetrically installed with two string fiber grating strings 2 on tube body, to eliminate influence of the temperature to test result, realizes
Temperature self-compensation.
Fiber grating string 2 is in series by 8 fiber-optic grating sensors in the present embodiment, and centre wavelength 1540~
1554nm, wavelength interval 2nm, when adjacent two measuring point on tube body strain within the specific limits when, can eliminate and close on optical fiber light
The interference of lattice wave length.
Theory of the fiber optical：From the coupled wave theory of fiber waveguide, light transmits in the optical fiber with Bragg gratings
When, meeting the light wave of formula (1) condition (being known as Bragg conditions) will be reflected by FBG, the corresponding central wavelength lambda of back waveBReferred to as
Bragg wavelength.
When external loads (as strain, temperature) act on FBG, cause the effective refractive index of grating to cause the effective of grating
Refractive index neffOr grating pitch Λ change when, the centre wavelength of FBG back waves also changes therewith.
λB=2neffΛ (1)
In formula, neff--- the effective refractive index of grating；Λ --- grating pitch.
When FBG tensions, pressure, in the axial generation strain (influence for ignoring temperature) of optical fiber, caused fiber grating
The drift of Bragg wavelength is represented by：
In formula, ε is Fiber Bragg Grating FBG axial strain；PeFor valid elastic-optic constants.
The present embodiment punching installation displacement measuring device, its operation principle in test zone 7 is as follows：
When the soil body in test zone 7 or building enclosure are subjected to displacement, 1 tube wall of pvc pipe is transferred force to so that PVC
Pipe 1 produces amount of deflection and surface strain variations.
If disregarding influence of the shearing to pvc pipe 1, can be obtained by theory of mechanics of materials：
Certain sectional twisting angle θiWith symmetrical 2 points on the section of strain differential εiRelation be
According to formula (3), formula (4), certain section amount of deflection f can be obtainediWith the strain stress of SensoriRelation be：
It is assumed that it is h that the distance of adjacent point-to-point transmission is all consistent, then from fixing end to free end, certain section amount of deflection fiWith sensing
The strain stress of device measuring pointiRelation be：
In formula：
fiFor the amount of deflection (deep displacement) of i-th point (being counted from fixing end) pvc pipe；
ε (i) is the bending strain of i-th pvc pipe, and strain tube is without constraint, ε=0 at i=n；
C is integral constant, and pvc pipe is fixed at x=0, therefore c=0；
R is distance (pvc pipe outer radius) of the grating apart from pvc pipe central axes.
Claims (5)
- A kind of 1. deeply mixing cement-soil pile measuring system, it is characterised in that：Including displacement measuring device, which has Tube body, and fiber grating string (2) on it is axially pasted along tube body, the fiber grating string on displacement measuring device connects successively Connect fiber grating and reconcile instrument (8) and computer (9).
- 2. deeply mixing cement-soil pile measuring system according to claim 1, it is characterised in that：The fiber grating string (2) with The fiber grating is connected between reconciling instrument (8) through armored optical cable (3) with FC optical cable jumpers (4), the connection of armored optical cable (3) one end Fiber grating string (2), other end connection FC optical cable jumpers (4).
- 3. deeply mixing cement-soil pile measuring system according to claim 1 or 2, it is characterised in that：The fiber grating string (2) With two strings, two string fiber grating strings are symmetrically arranged on the tube body.
- 4. deeply mixing cement-soil pile measuring system according to claim 3, it is characterised in that：The fiber grating string (2) is by 8 A fiber-optic grating sensor is in series, 1540~1554nm of centre wavelength, wavelength interval 2nm.
- 5. deeply mixing cement-soil pile measuring system according to claim 3, it is characterised in that：The tube body is by multiple pvc pipes (1) it is formed by connecting, is connected between adjacent two pvc pipe using connector (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721119188.7U CN207231407U (en) | 2017-09-01 | 2017-09-01 | Deeply mixing cement-soil pile measuring system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201721119188.7U CN207231407U (en) | 2017-09-01 | 2017-09-01 | Deeply mixing cement-soil pile measuring system |
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| CN207231407U true CN207231407U (en) | 2018-04-13 |
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| CN201721119188.7U Active CN207231407U (en) | 2017-09-01 | 2017-09-01 | Deeply mixing cement-soil pile measuring system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110608675A (en) * | 2019-08-16 | 2019-12-24 | 浙江华东工程安全技术有限公司 | Multi-point displacement testing method based on fiber grating sensing technology |
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2017
- 2017-09-01 CN CN201721119188.7U patent/CN207231407U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110608675A (en) * | 2019-08-16 | 2019-12-24 | 浙江华东工程安全技术有限公司 | Multi-point displacement testing method based on fiber grating sensing technology |
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| GR01 | Patent grant | ||
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| TR01 | Transfer of patent right |
Effective date of registration: 20210708 Address after: Room 609 and 610, North building, Huadong Hospital, 22 Chaowang Road, Hangzhou, Zhejiang 310014 Patentee after: Zhejiang Huadong mapping and Engineering Safety Technology Co.,Ltd. Address before: 1-2 / F, building 5, 355 Tianmu Shanxi Road, Xianlin street, Hangzhou City, Zhejiang Province Patentee before: ZHEJIANG HUADONG ENGINEERING SAFETY TECHNOLOGY Co.,Ltd. |