CN111021732A - Concrete vibrating rod positioning method based on optical fiber sensing - Google Patents
Concrete vibrating rod positioning method based on optical fiber sensing Download PDFInfo
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- CN111021732A CN111021732A CN201911310299.XA CN201911310299A CN111021732A CN 111021732 A CN111021732 A CN 111021732A CN 201911310299 A CN201911310299 A CN 201911310299A CN 111021732 A CN111021732 A CN 111021732A
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- optical fiber
- vibrating rod
- vibration detection
- concrete
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/02—Conveying or working-up concrete or similar masses able to be heaped or cast
- E04G21/06—Solidifying concrete, e.g. by application of vacuum before hardening
- E04G21/08—Internal vibrators, e.g. needle vibrators
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H9/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means
- G01H9/004—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means using fibre optic sensors
Abstract
The invention discloses a concrete vibrating rod positioning method based on optical fiber sensing, which comprises the following steps: laying a sensing optical fiber in a concrete pouring area, designating a plurality of vibration detection points in the sensing optical fiber in advance, and recording position coordinates of the vibration detection points; acquiring the amplitude data of each vibration detection point in real time through a sensing optical fiber; the vibration detection point with the maximum amplitude in the obtained amplitude data is a maximum amplitude point, and whether the maximum amplitude point is an effective peak point is judged; and obtaining the position of the vibrating rod in an area which takes the effective peak point as the center of a circle and r as the radius, wherein r is a preset value. By adopting the technical scheme, the vibrating position of the vibrating rod in the concrete construction process can be monitored, so that the concrete vibrating operation is standardized, and the engineering construction quality is improved; when the vibration defect is monitored, the vibration repairing can be timely prompted to constructors, and rework is avoided.
Description
Technical Field
The invention belongs to the technical field of concrete construction, and particularly relates to a concrete vibrating rod positioning method based on optical fiber sensing.
Background
In the concrete pouring process, in order to ensure the strength of the concrete, vibration work needs to be carried out so as to ensure the compactness of the concrete. In the field construction process, concrete vibration completely depends on the experience of constructors and the supervision of supervision personnel, and the vibration process is monitored by no effective monitoring means, so that when vibration operation is carried out, phenomena such as vibration leakage, under vibration, over vibration and the like often occur due to non-standard operation, follow-up remediation is needed, and the delay of project progress and the waste of resources are caused.
Chinese patent document CN106707932A discloses a visual real-time monitoring system for normal concrete vibration quality, which adopts the steps of installing a GPS positioning device on a vibration trolley, assisting with a vibration switch sensor, a distance measuring sensor, etc., collecting and calculating the position of a vibrating rod, the vibration duration, etc. during the vibration process, and then comprehensively analyzing the vibration result. Such a system suffers from the following disadvantages: the method is only suitable for the condition of vibrating the trolley, and the manual vibrating mode is generally adopted in practice; the precision of GPS positioning equipment is limited, and the action radius of the vibrating rod is basically about 0.5 meter, so that the precise positioning is difficult to realize; various sensors adopted by the system are traditional point sensors, and the problem that the whole vibration monitoring area cannot be covered generally exists.
Chinese patent document CN103696427A discloses a real-time monitoring and positioning system for a manual vibrating rod, which is to install a wireless signal transmitting device on the vibrating rod, install a signal receiving device in the vibrating area, position the vibrating rod through the received signals when the vibrating rod works, and simultaneously determine whether the vibrating process meets the time requirement. Such a system suffers from the following disadvantages: the signal transmitting and receiving process cannot represent the working process of the vibrating rod, namely, the vibrating rod can receive and transmit signals when being in an idle state in a working area, and the system cannot accurately acquire the working state information of the vibrating rod; various complicated construction environments may affect the transmission and reception of signals.
Chinese patent document CN102507658A discloses a method for real-time detection of concrete vibration time, which is to install an electrode for measuring the electric potential of the concrete to be vibrated on the head of the vibrating rod, and when the vibrating rod is inserted into and pulled out of the concrete, the electric potential value measured by the electrode changes, and the insertion and pulling out time of the vibrating rod can be calculated by analysis. The disadvantages of this method are: all the vibrating rods need to be modified and are not flexible to use.
Chinese patent document CN102444289A discloses a concrete pouring vibration dynamic visual monitoring method, which is to install an electrode and a GPS positioning antenna on a vibrating rod for measuring the electric potential of the concrete to be vibrated, position the working track of the vibrating rod by using the GPS, and determine the working duration of the vibrating rod by using the electrode, thereby determining the quality of the vibrating process. The disadvantages of this method are: the GPS has insufficient precision and cannot meet the positioning requirement of the vibrating rod; the positioning signal of the GPS is greatly influenced by the environment, and the positioning signal is interfered by the walking of a human body, a reinforcing steel bar frame and a template on a construction site and the like; the method needs to reform all vibrating rods and is not flexible enough; the vibrating quality is judged only by the vibrating time, which is not accurate enough.
Disclosure of Invention
In order to solve the problems, the invention discloses a concrete vibrating rod positioning method based on optical fiber sensing, which is characterized in that the vibrating rod is positioned through sensing optical fibers, and the vibrating condition of the vibrating rod is monitored in real time, so that the phenomena of leakage vibration, under vibration, over vibration and the like in vibrating operation can be found in time, field constructors are guided to carry out vibration compensation in time, and the later reworking is avoided.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a concrete vibrating rod positioning method based on optical fiber sensing comprises the following steps:
laying a sensing optical fiber in a concrete pouring area, designating a plurality of vibration detection points in the sensing optical fiber in advance, and recording position coordinates of the vibration detection points;
acquiring the amplitude data of each vibration detection point in real time through a sensing optical fiber;
the vibration detection point with the maximum amplitude in the obtained amplitude data is a maximum amplitude point, and whether the maximum amplitude point is an effective peak point is judged;
and obtaining the position of the vibrating rod in an area which takes the effective peak point as the center of a circle and r as the radius, wherein r is a preset value.
And judging whether the amplitude detected by the n front vibration detection points distributed along the sensing optical fiber at the maximum amplitude point is sequentially decreased, and whether the amplitude detected by the n rear vibration detection points is sequentially decreased, wherein n is a preset value, and if so, judging that the maximum amplitude point is an effective peak point.
And judging whether the amplitude detected by the k vibration detection points with sequentially increasing distances to the maximum amplitude point is sequentially decreased, and if so, judging that the maximum amplitude point is a valid peak point.
And after obtaining the effective peak point, judging whether the vibration detection point lasts for m seconds or not as the effective peak point, and if so, obtaining that the position of the vibrating rod is positioned in an area which takes the effective peak point as the center of a circle and takes r as the radius.
And establishing a 3D model corresponding to the arrangement trend of the concrete pouring area and the sensing optical fibers, and displaying the position information of the vibrating rod in real time.
And recording the time for acquiring the position information of the vibrating rod as the starting time of the vibrating time, and displaying the vibrating time information of the vibrating rod in real time.
The invention has the beneficial effects that:
according to the concrete vibrating rod positioning method based on optical fiber sensing, the vibrating position of the vibrating rod in the concrete construction process can be monitored, so that concrete vibrating operation is standardized, and the engineering construction quality is improved; when the vibration defect is monitored, the vibration repairing can be timely prompted to constructors, and rework is avoided.
Drawings
Fig. 1 is a schematic diagram of an embodiment of the sensing fiber arrangement of the present invention.
Fig. 2 is a real-time amplitude diagram of a portion of vibration detection points on a sensing optical fiber according to the first embodiment.
Fig. 3 is a schematic diagram of determining an effective peak point by a five-point peak-finding method in the first embodiment.
Fig. 4 is a schematic diagram illustrating the determination of the maximum amplitude point in the second embodiment.
Detailed Description
The present invention will be further illustrated with reference to the accompanying drawings and specific embodiments, which are to be understood as merely illustrative of the invention and not as limiting the scope of the invention.
The invention carries out the positioning of the vibrating rod through the sensing optical fiber which is a medium for signal and data transmission and is a sensor. When external vibration acts on the sensing optical fiber, the refractive index and the length of the optical fiber are slightly changed, so that an optical signal transmitted in the optical fiber is changed. By detecting the change of the optical signals before and after the vibration, the detection and the positioning of the vibration event along the optical fiber can be realized. And the sensing optical fiber is arranged in a concrete pouring area and laid along the extension direction of the steel bars of the concrete steel bar frame. As shown in fig. 1, the sensing optical fiber in this embodiment is laid in a reciprocating manner.
Establishing a 3D model corresponding to the arrangement trend of the concrete pouring area and the sensing optical fibers, appointing a plurality of vibration detection points on the sensing optical fibers in advance, recording the position coordinates of the vibration detection points and displaying the position coordinates on the 3D model correspondingly.
During the concrete casting process, when vibration begins, the amplitude data of each vibration detection point is immediately acquired through the sensing optical fiber, as shown in fig. 2.
And the vibration detection point with the maximum amplitude in the obtained amplitude data is the maximum amplitude point, and whether the maximum amplitude point is an effective peak point or not is judged.
For the determination of the effective peak point, in the first embodiment of the present invention, a five-point peak-finding method is adopted to determine, that is, it is first determined whether the amplitudes detected by the front 2 vibration detection points of the maximum amplitude point along the sensing fiber distribution are sequentially decreased, and the amplitudes detected by the rear 2 vibration detection points are sequentially decreased, if yes, it is determined that the maximum amplitude point is the effective peak point, as shown in fig. 3, point A3 in the figure is the maximum amplitude point, and points a2, a1 and a4, a5 which are respectively located at the front and rear sides are sequentially decreased, and point A3 is the effective peak point. Of course, the number of vibration detection points for sequentially decreasing the amplitude of the front side or the rear side can be preset to other values according to actual construction requirements.
In another embodiment two provided by the present invention, it can also be determined whether the amplitude detected by the k vibration detection points sequentially increasing in distance from the maximum amplitude point is sequentially decreasing, and if so, the maximum amplitude point is determined to be the valid peak point. As shown in fig. 4, for example, if k is equal to 5, and the maximum amplitude point is B1, the distribution of points arranged in order from the far side to the near side is points B2, B3, B4, and B5, and it is determined whether the amplitude decreases in order from point B1 to point B5, and if so, it is determined that the maximum amplitude point is point B1, which is an effective peak point. In the embodiment, the vibration detection points with the sequentially decreasing amplitude are not arranged along the trend of the sensing optical fiber, but are arranged sequentially at the distance from the maximum amplitude point, so that the final effective peak point judgment result is more accurate.
After the effective peak point is determined, it can be obtained that the position of the vibrating rod is located in an area which takes the effective peak point as a circle center and r as a radius, wherein r is a preset value, for example, 10 cm-25 cm, and the value of r can also be adjusted according to actual construction requirements.
The vibration monitoring point amplitude is considered to fluctuate, when the vibration monitoring points are many, points capable of meeting the characteristics of the effective peak point are likely to appear in sequence within a period of time, most of the points are not generated by vibration of the vibrating rod, the analysis vibration process can find that when the vibrating rod vibrates, the optical fiber monitoring point at the position of the vibrating rod can have a peak value which is continuously and stably met the characteristics of the effective peak value, and the peak points at other positions which meet the characteristics of the effective peak value do not have continuity, so that the optical fiber monitoring point corresponding to the vibration position of the vibrating rod can be accurately obtained by judging the continuity of the effective peak point. That is, after obtaining the effective peak point, it is determined whether the vibration detection point lasts for m seconds and is the effective peak point, for example, the data m seconds before the time is retrieved from the database for analysis, or the data m seconds after the time is taken as the starting point, and finally, if it can be determined that the vibration detection point lasts for m seconds and is the effective peak point, the position of the vibrating rod is determined according to the effective peak point.
The server can display the position information of the vibrating rod in real time in the display system. In addition, the time for acquiring the position information of the vibrating rod is recorded as the starting time of the vibrating time, so that the vibrating time information of the vibrating rod can be displayed in real time for supervision and reference of an operator.
By adopting the technical scheme, the vibrating position of the vibrating rod in the concrete construction process can be monitored, so that the concrete vibrating operation is standardized, and the engineering construction quality is improved; when the vibration defect is monitored, the vibration repairing can be timely prompted to constructors, and rework is avoided.
The technical means disclosed in the invention scheme are not limited to the technical means disclosed in the above embodiments, but also include the technical scheme formed by any combination of the above technical features.
Claims (7)
1. A concrete vibrating rod positioning method based on optical fiber sensing is characterized by comprising the following steps:
laying a sensing optical fiber in a concrete pouring area, designating a plurality of vibration detection points in the sensing optical fiber in advance, and recording position coordinates of the vibration detection points;
acquiring the amplitude data of each vibration detection point in real time through a sensing optical fiber;
the vibration detection point with the maximum amplitude in the obtained amplitude data is a maximum amplitude point, and whether the maximum amplitude point is an effective peak point is judged;
and obtaining the position of the vibrating rod in an area which takes the effective peak point as the center of a circle and r as the radius, wherein r is a preset value.
2. The concrete vibrating rod positioning method based on optical fiber sensing as claimed in claim 1, wherein: and judging whether the amplitude detected by the n front vibration detection points distributed along the sensing optical fiber at the maximum amplitude point is sequentially decreased, and whether the amplitude detected by the n rear vibration detection points is sequentially decreased, wherein n is a preset value, and if so, judging that the maximum amplitude point is an effective peak point.
3. The concrete vibrating rod positioning method based on optical fiber sensing as claimed in claim 1, wherein: and judging whether the amplitude detected by the k vibration detection points with sequentially increasing distances to the maximum amplitude point is sequentially decreased, and if so, judging that the maximum amplitude point is a valid peak point.
4. A method for positioning a concrete vibrating rod based on optical fiber sensing according to any one of claims 1 to 3, wherein: and after obtaining the effective peak point, judging whether the vibration detection point lasts for m seconds or not as the effective peak point, and if so, obtaining that the position of the vibrating rod is positioned in an area which takes the effective peak point as the center of a circle and takes r as the radius.
5. A method for positioning a concrete vibrating rod based on optical fiber sensing according to any one of claims 1 to 3, wherein: and establishing a 3D model corresponding to the arrangement trend of the concrete pouring area and the sensing optical fibers, and displaying the model.
6. The method for positioning the concrete vibrating rod based on the optical fiber sensing as claimed in claim 5, wherein the method comprises the following steps: and displaying the position information of the vibrating rod in real time.
7. The method for positioning the concrete vibrating rod based on the optical fiber sensing as claimed in claim 5, wherein the method comprises the following steps: and recording the time for acquiring the position information of the vibrating rod as the starting time of the vibrating time, and displaying the vibrating time information of the vibrating rod in real time.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111638321A (en) * | 2020-06-11 | 2020-09-08 | 江苏元华光电科技有限公司 | Vibration frequency and duration statistical method based on optical fiber sensing |
| CN112112431A (en) * | 2020-09-24 | 2020-12-22 | 周建刚 | Method for determining working position of concrete vibrator |
| CN112361960A (en) * | 2020-11-17 | 2021-02-12 | 苏交科集团检测认证有限公司 | Concrete vibrator accurate positioning method and system based on intelligent optical fiber sensing |
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| JPS60203821A (en) * | 1984-03-28 | 1985-10-15 | Hitachi Cable Ltd | Optical fiber vibrator |
| JP2002349770A (en) * | 2001-03-22 | 2002-12-04 | Ekusen Kk | Hose for concrete vibrator |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111638321A (en) * | 2020-06-11 | 2020-09-08 | 江苏元华光电科技有限公司 | Vibration frequency and duration statistical method based on optical fiber sensing |
| CN111638321B (en) * | 2020-06-11 | 2023-08-22 | 江苏元华光电科技有限公司 | Vibration frequency and duration time statistical method based on optical fiber sensing |
| CN112112431A (en) * | 2020-09-24 | 2020-12-22 | 周建刚 | Method for determining working position of concrete vibrator |
| CN112361960A (en) * | 2020-11-17 | 2021-02-12 | 苏交科集团检测认证有限公司 | Concrete vibrator accurate positioning method and system based on intelligent optical fiber sensing |
| CN112361960B (en) * | 2020-11-17 | 2022-03-22 | 苏交科集团检测认证有限公司 | Concrete vibrator accurate positioning method and system based on intelligent optical fiber sensing |
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