CN108755616B - Optical fiber sensor buries protective device - Google Patents
Optical fiber sensor buries protective device Download PDFInfo
- Publication number
- CN108755616B CN108755616B CN201810957971.3A CN201810957971A CN108755616B CN 108755616 B CN108755616 B CN 108755616B CN 201810957971 A CN201810957971 A CN 201810957971A CN 108755616 B CN108755616 B CN 108755616B
- Authority
- CN
- China
- Prior art keywords
- protective sleeve
- optical fiber
- outer protective
- fiber sensor
- sleeve
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 230000001681 protective effect Effects 0.000 title claims abstract description 104
- 239000013307 optical fiber Substances 0.000 title claims abstract description 63
- 238000010276 construction Methods 0.000 claims description 20
- 238000000034 method Methods 0.000 claims description 16
- 239000000463 material Substances 0.000 claims description 7
- 239000004568 cement Substances 0.000 claims description 5
- 229910000838 Al alloy Inorganic materials 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000000378 calcium silicate Substances 0.000 claims description 3
- 229910052918 calcium silicate Inorganic materials 0.000 claims description 3
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 description 6
- 230000003287 optical effect Effects 0.000 description 3
- 238000005266 casting Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000013308 plastic optical fiber Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B8/00—Details of barrages or weirs ; Energy dissipating devices carried by lock or dry-dock gates
Abstract
The invention discloses an optical fiber sensor embedded protection device, which consists of an inner protection sleeve, a first outer protection sleeve and a second outer protection sleeve; the end parts of the first outer protective sleeve and the second outer protective sleeve are provided with notches, the first outer protective sleeve and the second outer protective sleeve can be mutually embedded into a hollow circular tube through the notches, the inner diameter of the hollow circular tube is larger than the outer diameter of the inner protective sleeve 2, the inner protective sleeve consists of a plurality of sections of independent hollow short-section circular tubes, the inner diameter of the inner protective sleeve is larger than the outer diameter of the protected optical fiber sensor, and the contact surfaces of two adjacent sections of hollow short-section circular tubes are planes with a certain included angle theta with the axis of the optical fiber sensor. The optical fiber sensor burying device provided by the invention has the advantages of simple structure and convenience in operation.
Description
Technical Field
The invention relates to the technical field of optical fiber sensing, in particular to an optical fiber sensor embedded protection device.
Background
Fiber optic sensors are increasingly used in engineering. In order to monitor the running state of the dam in real time, a large number of optical fiber sensors are required to be distributed in the dam during construction. The optical fiber sensor is slim and fragile, is easy to damage in use, and is extensive in engineering construction process, so that effective protection measures are adopted for the optical fiber when the optical fiber is buried. The traditional protection method comprises the following steps: in the concrete pouring process, each time one layer of concrete is poured, grooving is carried out on the surface of the layer of concrete, an optical fiber sensor is placed in the groove to be buried and protected by fine aggregate concrete, and then pouring of the next layer of concrete is continued.
In the conventional manner, the embedded height of each layer of optical fiber sensor is required to depend on the thickness of each layer of concreting layer. Moreover, when the number of optical fiber sensors to be buried is large, the grooving and burying workload is large, the required operation time is long, and the construction progress is affected. Moreover, because the self weight of the water conservancy construction machine is large, fine aggregate concrete in the groove cannot completely protect the optical fiber sensor, and part of the optical fiber sensor still can be damaged in the construction process.
Disclosure of Invention
The invention aims to overcome the defects, and provides the optical fiber sensor embedding protection device which is used for guaranteeing that the optical fiber sensor is not damaged in the engineering construction process and overcoming the defects that the embedding height of an optical fiber layer in the traditional method is required to depend on the thickness of a concrete pouring layer, the embedding workload greatly influences the construction progress, the protection effect is limited and the like.
In order to solve the problems, the invention provides the following technical scheme:
an optical fiber sensor embedded protection device consists of an inner protection sleeve, a first outer protection sleeve and a second outer protection sleeve; the end parts of the first outer protective sleeve and the second outer protective sleeve are provided with notches, the first outer protective sleeve and the second outer protective sleeve can be mutually embedded into a hollow circular tube through the notches, the inner diameter of the hollow circular tube is larger than the outer diameter of the inner protective sleeve 2, the inner protective sleeve consists of a plurality of sections of independent hollow short-section circular tubes, the inner diameter of the inner protective sleeve is larger than the outer diameter of the protected optical fiber sensor, and the contact surfaces of two adjacent sections of hollow short-section circular tubes are planes which form a certain included angle theta with the axis of the optical fiber sensor, wherein the theta is more than 0 DEG and less than or equal to 90 deg.
Preferably, the position where the first outer protective sleeve and the second outer protective sleeve are embedded into each other is kept smooth, and the first outer protective sleeve and the second outer protective sleeve can mutually move and translate under the action of external force.
Preferably, the thickness of the hollow round tube is preferably 5 cm-10 cm, and the length is preferably 100 cm-500 cm; the outer diameter of the inner protective sleeve is preferably 5 cm-10 cm, and the length of each section of the hollow short section circular tube is preferably 5 cm-100 cm.
Preferably, the first outer protective sleeve and the second outer protective sleeve are made of steel.
Preferably, one ends of the first outer protective sleeve and the second outer protective sleeve are provided with hanging rings.
Preferably, a plurality of through holes along the length direction are formed in the side walls of the first outer protective sleeve and the second outer protective sleeve, and the radius of each through hole is preferably 3 cm-5 cm.
Preferably, θ is 30.ltoreq.θ is.ltoreq.60°.
Preferably, the inner protective sleeve is made of aluminum alloy or calcium silicate material.
The invention also provides a construction method by utilizing the optical fiber sensor embedded protection device, which comprises the following steps: placing the optical fiber sensor protection device in the concrete, and exposing the hanging rings on the first outer protection sleeve and the second outer protection sleeve on the surface of the concrete; lifting the lifting ring after compacting the concrete layer, and improving the first outer protective sleeve and the second outer protective sleeve to the height of the next pouring layer; in the process of pulling out the first outer protective sleeve and the second outer protective sleeve, cement paste is injected into the structure through the through holes to fill gaps left by pulling out the first outer protective sleeve and the second outer protective sleeve; thus, in the construction process, following the construction progress, the first outer protective sleeve and the second outer protective sleeve are pulled to the next pouring height repeatedly, so that the burying work of the optical fiber sensor with the inner protective sleeve is completed.
The invention has the following beneficial effects:
the optical fiber sensor burying device provided by the invention has the advantages of simple structure and convenience in operation. The embedded position of the optical fiber sensor is not dependent on the pouring form of concrete. And the optical fiber sensor has small embedding workload and small interference to construction. The hollow round tube formed by the two outer protective sleeves can realize omnibearing protection of the internal optical fiber sensor. The inner protective sleeve can play roles of heat insulation, heat preservation, monitoring sensitivity enhancement and the like by adjusting manufacturing materials and sizes according to the monitoring purpose of the optical fiber sensor.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of a transverse cross-sectional structure of the present invention;
FIG. 2 is a schematic view of a longitudinal cross-sectional structure of the present invention;
fig. 3 is a graph of test results of the relation between the optical loss value and the crack opening.
In the figure, the optical fiber sensor 1, the inner protective sleeve 2, the first outer protective sleeve 3, the second outer protective sleeve 4, the through hole 5 and the hanging ring 6.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments, and all other embodiments obtained by those skilled in the art without making any inventive effort based on the embodiments of the present invention are within the scope of protection of the present invention.
The optical fiber sensor protection device of the present invention is composed of an inner protection sleeve 2 and a first outer protection sleeve 3 and a second outer protection sleeve 4, as shown in fig. 1-2.
The first outer protective sleeve 3 and the second outer protective sleeve 4 are mutually embedded into a hollow circular tube by utilizing matched gaps at the end parts, the mutually embedded positions are kept smooth, and the first outer protective sleeve 3 and the second outer protective sleeve 4 can mutually move and translate under the action of external force. The inner diameter of the combined hollow round tube is slightly larger than the outer diameter of the inner protective sleeve 2, the thickness is preferably 5 cm-10 cm, and the length is preferably 100 cm-500 cm. The first outer protective sleeve 3 and the second outer protective sleeve 4 are temporary protective structures in the construction process, and are designed to resist external impact force in the construction process and ensure the flatness of the protective sleeve 2 and the optical fiber sensor 1 inside the protective sleeves, so that the protective sleeves can be made of hard steel materials. In the construction process, the first outer protective sleeve 3 and the second outer protective sleeve 4 can be pulled up to the next casting height in sequence through the hanging rings 6 designed at the end parts of the first outer protective sleeve 3 and the second outer protective sleeve 4, and the inner protective sleeve 2 is left in the engineering structure to continuously protect the optical fiber sensor 1. When the first outer protective sleeve 3 and the second outer protective sleeve 4 are pulled out, cement paste is injected into the structure through the through holes 5 reserved on the first outer protective sleeve 3 and the second outer protective sleeve 4, and the radius of the through holes 5 is preferably 3 cm-5 cm, so as to eliminate gaps generated by pulling out the structure. As a preferred embodiment, the first outer protective sheath 3 and the second outer protective sheath 4 are each provided with two through-holes 5, one of which is provided with ventilation when cement slurry is injected through the other.
The inner protective sleeve 2 consists of a plurality of sections of independent hollow short section round tubes, the inner diameter of the inner protective sleeve is slightly larger than the outer diameter of the protected optical fiber sensor 1, and the outer diameter is preferably 5 cm-10 cm. The contact surface of the two adjacent inner protection sleeves 2 is a plane with a certain included angle theta with the axis of the optical fiber sensor, wherein theta is more than 0 DEG and less than or equal to 90 DEG, preferably more than or equal to 30 DEG and less than or equal to 60 DEG, and more preferably 45 deg. The material of the inner sheath 2 depends on the object to be monitored of the optical fiber sensor 1. When the monitoring object of the optical fiber sensor is the external temperature, the inner protective sleeve 2 can be made of materials such as aluminum alloy with better heat conduction performance. When the object to be monitored of the optical fiber sensor is not temperature and the external temperature is an interference factor, the inner protective sleeve 2 can be made of a material such as calcium silicate with good heat insulation performance. The length of each section of the hollow short section circular tube of the inner protective sleeve 2 is preferably 5 cm-100 cm. The inner protection sleeve 2 is a short section, and the contact surface between two adjacent sections is an inclined surface relative to the optical fiber axis direction, so that when the monitoring object of the optical fiber sensor 1 is a structural crack, relative dislocation perpendicular to the optical fiber axis direction can occur between two adjacent sections of hollow short section round tubes of the inner protection sleeve 2, the shearing action of relative dislocation deformation on the inner optical fiber sensor 1 can be enhanced, and the sensitivity of the optical fiber sensor 1 in monitoring deformation can be enhanced. The conventional method for monitoring the crack by the optical fiber is to skew the optical fiber with the crack, and the crack breaks the optical fiber sensor to generate microbending deformation, and the microbending deformation causes optical loss of the optical fiber, so that the occurrence of the crack is monitored. FIG. 3 shows the relationship between the optical loss value and the crack opening under the shearing action and the conventional skew action of the plastic optical fiber in the protection device used in the present invention.
When the optical fiber sensor embedded protection device is used for construction, the optical fiber sensor protection device is placed in concrete, and the hanging rings 6 on the first outer protection sleeve 3 and the second outer protection sleeve 4 are exposed out of the surface of the concrete; lifting the lifting ring 6 after compacting the concrete layer, and lifting the first outer protective sleeve 3 and the second outer protective sleeve 4 to the height of the next pouring layer; during the process of pulling out the first outer protective sleeve 3 and the second outer protective sleeve 4, cement slurry is injected into the structure through the through holes 5 to fill gaps left by pulling out the first outer protective sleeve 3 and the second outer protective sleeve 4; thus, in the construction process, following the construction progress, the burying work of the optical fiber sensor 1 with the inner protective sheath 2 is completed by repeatedly pulling the first outer protective sheath 3 and the second outer protective sheath 4 to the next casting height.
Claims (7)
1. The buried protection device for the optical fiber sensor is characterized by comprising an inner protection sleeve, a first outer protection sleeve and a second outer protection sleeve; the end parts of the first outer protective sleeve and the second outer protective sleeve are provided with notches, the first outer protective sleeve and the second outer protective sleeve can be mutually embedded into a hollow circular tube through the notches, the inner diameter of the hollow circular tube is larger than the outer diameter of the inner protective sleeve, the inner protective sleeve consists of a plurality of sections of independent hollow short-section circular tubes, the inner diameter of the inner protective sleeve is larger than the outer diameter of the protected optical fiber sensor, and the contact surfaces of two adjacent sections of hollow short-section circular tubes are planes with a certain included angle theta with the axis of the optical fiber sensor, wherein the theta is more than 0 degree and less than or equal to 90 degrees;
the side walls of the first outer protective sleeve and the second outer protective sleeve are provided with a plurality of through holes along the length direction, and the radius of each through hole is 3 cm-5 cm;
one end of the first outer protective sleeve and one end of the second outer protective sleeve are provided with hanging rings.
2. The optical fiber sensor embedded protection device according to claim 1, wherein the first outer protective sleeve and the second outer protective sleeve are kept smooth at the position where they are embedded, and can move and translate with each other under the action of external force.
3. The optical fiber sensor embedded protection device according to claim 1, wherein the hollow round tube has a thickness of 5 cm-10 cm and a length of 100 cm-500 cm; the outer diameter of the inner protective sleeve is 5 cm-10 cm, and the length of each section of the hollow short section circular tube is 5 cm-100 cm.
4. The optical fiber sensor embedded protection device according to claim 1, wherein the first outer protective sleeve and the second outer protective sleeve are made of steel.
5. The optical fiber sensor embedded protection device according to claim 1, wherein θ is 30 ° or more and 60 ° or less.
6. The optical fiber sensor embedded protection device according to claim 1, wherein the inner protective sleeve is made of aluminum alloy or calcium silicate material.
7. A method of construction using an optical fiber sensor embedded protection device according to claim 1, comprising the steps of: placing the optical fiber sensor protection device in the concrete, and exposing the hanging rings on the first outer protection sleeve and the second outer protection sleeve on the surface of the concrete; lifting the lifting ring after compacting the concrete layer, and improving the first outer protective sleeve and the second outer protective sleeve to the height of the next pouring layer; in the process of pulling out the first outer protective sleeve and the second outer protective sleeve, cement paste is injected into the structure through the through holes to fill gaps left by pulling out the first outer protective sleeve and the second outer protective sleeve; thus, in the construction process, following the construction progress, the first outer protective sleeve and the second outer protective sleeve are pulled to the next pouring height repeatedly, so that the burying work of the optical fiber sensor with the inner protective sleeve is completed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810957971.3A CN108755616B (en) | 2018-08-22 | 2018-08-22 | Optical fiber sensor buries protective device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810957971.3A CN108755616B (en) | 2018-08-22 | 2018-08-22 | Optical fiber sensor buries protective device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108755616A CN108755616A (en) | 2018-11-06 |
| CN108755616B true CN108755616B (en) | 2024-02-20 |
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| CN108755616A (en) | 2018-11-06 |
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