CN114111617B - Inflatable capsule structure for detecting pipeline linearity and detection method - Google Patents
Inflatable capsule structure for detecting pipeline linearity and detection method Download PDFInfo
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- CN114111617B CN114111617B CN202111518753.8A CN202111518753A CN114111617B CN 114111617 B CN114111617 B CN 114111617B CN 202111518753 A CN202111518753 A CN 202111518753A CN 114111617 B CN114111617 B CN 114111617B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
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- Length Measuring Devices By Optical Means (AREA)
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Abstract
The application discloses an inflatable capsule structure for detecting pipeline linearity and a detection method, comprising the following steps: the inflatable capsule is provided with an inflation/deflation nozzle, and is tightly attached to the pipeline after being inflated; the plurality of distributed optical fiber space attitude monitoring sensors are distributed on the inner wall of the inflatable capsule at equal intervals along the circumferential direction of the inflatable capsule; the distributed optical fiber space attitude monitoring sensor comprises a single-model strain optical fiber and a single-mode temperature optical fiber, wherein the single-model strain optical fiber is used for testing strain information of corresponding positions, and the single-mode temperature optical fiber is used for calculating temperature compensation. The application solves the problem that the line shape of the pipeline is difficult to control in the prefabrication process of the segmental beam.
Description
Technical Field
The application relates to the field of bridge concrete precast member detection. More particularly, the present application relates to an inflatable bladder structure for detecting a line shape of a pipeline and a detecting method.
Background
Along with the continuous development of economy and society, the construction technology of the prefabricated assembly bridge gradually and widely applies in the field of bridge construction by virtue of the advantages of short construction period and low cost, wherein the principle of the mainly used bridge segment prefabrication assembly technology is that a bridge structure is divided into a plurality of standard segments, after the prefabrication site is matched and prefabricated, the bridge segments are assembled in sequence block by special assembly equipment such as a bridge girder erection machine on site, and prestressing force is applied to enable the bridge segments to be an integral structure. When the sectional beam is manufactured, a pre-stressed pipeline is required to be preset, when the sectional beam is assembled, the pre-stressed pipeline is penetrated through the pre-stressed steel bars and tensioned to apply pre-stress, if the pre-stress loss is overlarge, the corresponding structure is caused to generate overlarge deflection deformation, the bridge line shape is affected, and when serious, the beam section is cracked to generate a safety accident. The linear deviation of the prestressed pipeline has obvious influence on the loss of the prestress, the prestressed pipeline of the segment beams is detected, the integral linear deviation of the pipeline is grasped, and the method is a key for controlling the prestress among the segment beams, and has great engineering significance for the safety of the state of the prefabricated bridge Liang Chengqiao.
Most of the existing detection methods for the segment beam prestressed pipeline still adopt a manual mode, and the specific methods comprise manual visual detection or detection by passing through the prestressed pipeline through a rubber plug and a steel wire rope. The manual visual inspection can only judge whether the pipeline is smooth straight line, and the method of the rubber plug and the steel wire rope can only judge whether the pipeline is smooth, so that the linear prefabricated deviation value of the pipeline cannot be obtained. In the prefabrication process of the segmental beam, the shape of the prestressed pipeline can be kept by a method of plugging an inflatable capsule into the prestressed pipeline, but as the prestressed pipeline is generally made of a plastic corrugated pipe, the middle part of the pipeline is easy to deform due to the softness of the pipeline, and the deformation of the middle part is still difficult to detect, the method for detecting the prestressed pipeline is urgently needed, and the specific line type of the pipeline can be detected. At present, with the rapid development of distributed optical fiber monitoring technology, the distributed optical fiber monitoring technology can be combined with an inflatable capsule to perform pipeline linear detection.
Disclosure of Invention
The application aims to provide an inflatable capsule structure for detecting pipeline linearity and a detection method, which solve the problem that pipeline linearity is difficult to control in a segment beam prefabrication process.
The technical scheme adopted by the application for solving the technical problem is as follows: an inflatable capsule structure for detecting the shape of a pipeline comprises
The inflatable capsule is provided with an inflation/deflation nozzle, and is tightly attached to the pipeline after being inflated;
the plurality of distributed optical fiber space attitude monitoring sensors are distributed on the inner wall of the inflatable capsule at equal intervals along the circumferential direction of the inflatable capsule; the distributed optical fiber space attitude monitoring sensor comprises a single-model strain optical fiber and a single-mode temperature optical fiber, wherein the single-model strain optical fiber is used for testing strain information of corresponding positions, and the single-mode temperature optical fiber is used for calculating temperature compensation.
Preferably, the distributed optical fiber space attitude monitoring sensor comprises a plurality of measuring point units which are connected in series; the measuring point unit comprises:
a polymer composite bar;
four single-mode strain optical fibers are distributed at intervals of 90 degrees along the outer circumferential direction of the polymer composite rib;
the single-mode temperature strain optical fiber is coaxially positioned at the center of the high polymer composite rib and is used for testing the ambient temperature and the temperature compensation of the four single-mode strain optical fibers.
Preferably, the surface of the polymer composite rib is provided with an opening for installing the single-model strain optical fiber.
Preferably, two ends of the polymer composite rib are connected with an optical fiber junction box, two opposite single-mode strain optical fibers and a single-mode temperature strain optical fiber in the optical fiber junction box are mutually welded to form an optical path and are connected with a transmission optical cable signal wire, and the remaining two opposite single-mode strain optical fibers are welded to form an optical path and are connected with the transmission optical cable signal wire.
Preferably, 3-4 distributed optical fiber space attitude monitoring sensors are circumferentially distributed on the inner wall of the inflatable capsule structure at equal angles.
Preferably, the polymer composite ribs of the distributed optical fiber space attitude monitoring sensor are limited by stiffening ribs, and a certain gap is formed between the stiffening ribs and the polymer composite ribs.
Preferably, the outer wall of the inflatable capsule is provided with scales.
Preferably, the diameter of the polymer composite bar is set to be 6-10mm.
Preferably, the stiffening rib forms a cavity for accommodating the polymer composite rib, two ends of the stiffening rib are sealed through the end covers, the transmission optical cable signal wire of the measuring point unit penetrates out of the end covers, and the cavity is communicated with the inner space of the inflatable capsule.
The application also provides a detection method utilizing the inflatable capsule structure, which comprises the following steps:
s1, in the casting process of the segmental beam, after the steel reinforcement framework is placed in the template, connecting the plastic corrugated pipe with the fixed template and the matched beam through the fixing function of the steel reinforcement framework, and completing the positioning and fixing of the plastic corrugated pipe, so that the initial line shape of the pipeline can be determined;
s2, penetrating the inflatable capsule from a pore canal at one side of the matching beam until the tail part of the inflatable capsule is tightly fixed with an end mould, and recording an initial strain value of the distributed optical fiber space posture monitoring sensor and an inlet position of the inflatable capsule at the pore canal end;
s3, filling rated air pressure into the inflatable capsule, pouring cast-in-situ beam concrete, and removing the mould after curing, wherein the sensor in the inflatable capsule and the pipeline structure cooperatively deform during the curing;
s4, reading data of each measuring point of the plurality of distributed optical fiber space gesture monitoring sensors through a signal line, obtaining space information of the distributed optical fiber space gesture monitoring sensors in a plurality of directions through a strain-curvature relation, fitting measuring point coordinates of the plurality of distributed optical fiber space gesture monitoring sensors, and obtaining the axis line shape of the pipeline;
s5, comparing the final centreline shape of the pipeline with the design line shape to obtain the maximum deviation displacement so as to control the axis precision of the pipeline; the inflatable capsule is extracted after decompression.
The application at least comprises the following beneficial effects:
1) According to the application, the inflation capsule is arranged in the plastic corrugated pipe, and the pipeline linear detection is carried out by a method of embedding the optical fiber sensor in the inflation capsule, so that the capsule and the pipeline are tightly attached when the capsule is inflated, and the deformation of the pipeline can be accurately reflected to the optical fiber sensor; the capsule can be simply and conveniently pulled out from the pipeline when being deflated, and the pipeline line shape in the pouring process can not be influenced.
2) The application uses the distributed optical fiber sensor, based on the strain-curvature geometric relationship, can acquire the spatial position information of the prestressed pipeline, and has important significance for controlling the pipeline linear precision.
Additional advantages, objects, and features of the application will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the application.
Drawings
FIG. 1 is a schematic view of the interior of an inflatable capsule of the present application;
FIG. 2 is a cross-sectional view A-A of FIG. 1;
FIG. 3 is a schematic diagram of a distributed fiber optic spatial attitude sensor station unit of the present application;
FIG. 4 is a left side view of the station unit of the present application;
fig. 5 is a schematic view of the operation of the inflatable capsule of the present application.
Reference numerals illustrate: the sensor comprises a gas filled capsule 1, a pipeline 2, a distributed optical fiber space posture monitoring sensor 3, a gas filled/discharged nozzle 4, a transmission optical cable signal line 5, a stiffening rib 6, a first branch box 7, a second branch box 8, a polymer composite rib 9, a single-mode strain optical fiber 10, a single-mode temperature strain optical fiber 11, a reinforcing steel bar framework 12, a fixed end die 13, a matching beam 14 and a cast-in-situ beam 15.
Detailed Description
The present application will now be described more fully hereinafter with reference to the accompanying drawings. Those of ordinary skill in the art will be able to implement the application based on these descriptions. Before describing the present application with reference to the accompanying drawings, it should be noted in particular that: the technical solutions and technical features provided in the sections including the following description in the present application may be combined with each other without conflict.
In addition, the embodiments of the present application referred to in the following description are typically only some, but not all, embodiments of the present application. Therefore, all other embodiments, which can be made by one of ordinary skill in the art without undue burden, are intended to be within the scope of the present application, based on the embodiments of the present application.
The application is further described in detail below with reference to the drawings and the implementation, and the implementation process is as follows:
as shown in fig. 1 to 4, the present application provides an inflatable capsule 1 structure for detecting the linearity of a pipe 2, comprising:
one end of the inflatable capsule 1 is provided with an inflation/deflation nozzle 4, and the inflatable capsule 1 is tightly attached to the pipeline 2 after being inflated;
the plurality of distributed optical fiber space posture monitoring sensors 3 are distributed on the inner wall of the inflatable capsule 1 at equal intervals along the circumferential direction of the inflatable capsule 1; the distributed optical fiber space attitude monitoring sensor 3 comprises a single-mode strain optical fiber and a single-mode temperature optical fiber, wherein the single-mode strain optical fiber is used for testing strain information of corresponding positions, and the single-mode temperature optical fiber is used for calculating temperature compensation. The purpose of the three or more distributed optical fiber space posture monitoring sensors 3 is to ensure that the coordinates of the axis of the pipeline can be determined by the centroid coordinates formed by the coordinates of the three sensors 3 when the inflatable bladder 1 is twisted.
In the above technical solution, the axis of the distributed optical fiber space posture monitoring sensor 3, the axis of the inflation capsule 1 and the axis of the pipe 2 are parallel to each other. The distributed optical fiber space posture monitoring sensor 3 extends to the tail end of the inflatable capsule 1 at one end in the axial direction, and extends to the vicinity of the inflation/deflation nozzle at one end, but is not attached to the inflation/deflation nozzle, and a space of at least 10mm is left.
In the line shape detection of the pipeline 2, the sensor strain caused by structural deformation is obtained after temperature compensation is carried out on strain data in the distributed optical fiber space posture monitoring sensor 3, and then the line shape of the pipeline 2 is reconstructed in a segmented mode according to the strain-curvature geometric relation.
As shown in fig. 1, the inflatable bladder 1 needs to have a certain axial rigidity, on the one hand, in order to enable it to extend smoothly into the tail end of the bellows, and on the other hand, in order to enable the bladder to be inflated without being deformed in an axial direction and to stretch the sensor. Stiffening fibers are added to the raw materials of the inflatable bladder 1 in the embodiment to improve the axial rigidity of the inflatable bladder 1, but the application of other inflatable bladders 1 with certain rigidity in the technical scheme is not limited.
The technical scheme can also comprise the following technical details so as to better realize the technical effects: the distributed optical fiber space attitude monitoring sensor 3 comprises a plurality of measuring point units which are connected in series; the measuring point unit comprises:
the polymer composite rib 9 is of a cylindrical structure;
four single-mode strain optical fibers 10 are distributed at intervals of 90 degrees along the outer circumferential direction of the polymer composite rib 9; each single-mode strain optical fiber 10 is used as a strain sensing unit in the sensor and is used for sensing the strain of the inflatable capsule 1 in the four directions of up, down, left and right so as to calculate the curvatures of the two orthogonal directions on the cross section;
the single-mode temperature strain optical fiber 11 is coaxially positioned at the center of the polymer composite rib 9 and is used for testing the ambient temperature and the temperature compensation of the four single-mode strain optical fibers 10.
In the present embodiment, the line shape of the distributed optical fiber spatial posture monitoring sensor 3 is calculated by calculating the curvatures in two orthogonal directions on the cross section to obtain the spatial curvature, and the torsion of the inflatable capsule 1 does not affect the spatial curvature by the multi-sensor structure of the present application.
The technical scheme can also comprise the following technical details so as to better realize the technical effects: as shown in fig. 4, the surface of the polymer composite rib 9 is provided with an opening for installing a single-mode strain optical fiber, and in this embodiment, the depth of the opening is 1.5mm, so that the polymer composite rib 9 is convenient to install and detach.
The technical scheme can also comprise the following technical details so as to better realize the technical effects: the two ends of the polymer composite rib 9 are connected with optical fiber junction boxes (junction box one 7 and junction box two 8), two opposite single-mode strain optical fibers 10 and a single-mode temperature strain optical fiber 11 in the optical fiber junction box are mutually welded to form an optical path and are connected with a transmission optical cable signal line 5, and the remaining two opposite single-mode strain optical fibers 10 are welded to form an optical path and are connected with the transmission optical cable signal line 5. The signal line is connected with the Brillouin optical time domain reflectometer and is used for receiving optical signals to measure strain and temperature.
As shown in fig. 3, the transmission optical cable signal line 5 is connected from the first junction box 7 and is welded with the lower single-mode strain optical fiber 10, the lower single-mode strain optical fiber 10 is welded with the temperature strain optical fiber in the junction box 2, the temperature strain optical fiber is welded with the upper single-mode strain optical fiber 10 in the junction box 1, and the upper single-mode strain optical fiber 10 is connected with another transmission optical cable in the junction box 2 to form a complete optical path; the left and right single-mode strain optical fibers 10 are connected to form a complete optical path. The four single-mode strain optical fibers 10 form two optical fiber communication optical paths in total, one is used for measuring strain in the up-down direction and the other is used for measuring strain in the left-right direction, and finally the four single-mode strain optical fibers are connected with the left-right optical cables, but one temperature optical fiber is arranged in one optical path.
The technical scheme can also comprise the following technical details so as to better realize the technical effects: 3-4 distributed optical fiber space attitude monitoring sensors 3 are circumferentially distributed on the inner wall of the structure of the inflatable capsule 1 at equal angles, deformation data are transmitted outwards through signal lines, the distributed optical fiber space attitude sensors distributed in the circumferential direction can obtain a plurality of pieces of linear information, and coordinates of measuring points of the sensors are fitted to obtain the axial line shape of the pipeline 2.
The technical scheme can also comprise the following technical details so as to better realize the technical effects: the polymer composite rib 9 of the distributed optical fiber space attitude monitoring sensor 3 is limited by the stiffening rib 6, a certain gap is formed between the stiffening rib 6 and the polymer composite rib 9, and tiny displacement can be achieved on the axis, so that strain of a strain sensing unit is not limited by the stiffening rib 6, and meanwhile internal and external air pressure balance of the sensor is guaranteed.
The technical scheme can also comprise the following technical details so as to better realize the technical effects: the outer wall of the inflatable capsule 1 is provided with scales, and the scales are arranged above the outer wall of the capsule in the embodiment and are used for recording the extending amount of the inflatable capsule 1 in the pipelines 2 and the torsion amount at the inlet and outlet of each pipeline 2.
The technical scheme can also comprise the following technical details so as to better realize the technical effects: the diameter of the polymer composite rib 9 can be set to 6-10mm according to the need under the consideration of the size limitation of the inflatable capsule 1.
In the embodiment, the linear curvature of the pipeline 2 has larger change, the length of the measuring point units is set to be 20mm, the measuring point units are densely distributed, the units are designed to be smaller in length, and the accuracy of detecting the linear shape is improved.
The technical scheme can also comprise the following technical details so as to better realize the technical effects: in order to prolong the service life of the distributed optical fiber space attitude monitoring sensor 3, the stiffening ribs 6 form a cavity for accommodating the polymer composite ribs 9, two ends of the stiffening ribs are sealed through end covers, the transmission optical cable signal wires 5 of the measuring point units penetrate out of the end covers, and the cavity is communicated with the inner space of the inflatable capsule 1, so that the air pressure in the inflatable capsule 1 is consistent with the air pressure in the cavity, and the air pressure balance is achieved.
Example 2
As shown in fig. 5, a detection method using the structure of the inflatable capsule 1 includes the steps of:
s1, in the casting process of the segmental beam, after a steel reinforcement framework 12 of a cast-in-situ beam 15 is placed in a template, connecting a plastic corrugated pipe with a fixed template and a matching beam 14 through the fixing function of the steel reinforcement framework 12, and completing the positioning and fixing of the plastic corrugated pipe, so that the initial line shape of a pipeline 2 can be determined;
s2, penetrating the inflatable capsule 1 from a hole channel at one side of the matching beam 14 until the tail part of the inflatable capsule 1 is tightly fixed with the end die 13, recording an initial strain value of the distributed optical fiber space posture monitoring sensor 3 and an inlet position of the inflatable capsule 1 at the hole channel end, and determining a linear starting position of the pipeline 2 through the surface scale of the inflatable capsule 1 in the embodiment;
s3, filling rated air pressure into the inflatable capsule 1 to enable the inflatable capsule 1 to be closely attached to the inner wall of the corrugated pipe, pouring concrete of the cast-in-situ beam 15, removing the mould after curing, and cooperatively deforming the sensor in the inflatable capsule 1 and the structure of the pipeline 2 during the curing;
s4, reading data of each measuring point of the plurality of distributed optical fiber space gesture monitoring sensors 3 through a signal line, obtaining space information of the distributed optical fiber space gesture monitoring sensors 3 in a plurality of directions through a strain-curvature relation, fitting measuring point coordinates of the plurality of distributed optical fiber space gesture monitoring sensors 3 to obtain an axis line shape of the pipeline 2, and finally obtaining a line shape coordinate of the pipeline 2 after pouring through the strain-curvature geometrical relation;
s5, comparing the final centreline of the pipeline 2 with the design line to obtain the maximum deviation displacement so as to control the axis precision of the pipeline 2; the inflatable capsule 1 is extracted after decompression.
Although embodiments of the present application have been disclosed above, it is not limited to the details and embodiments shown, it is well suited to various fields of use for which the application is suited, and further modifications may be readily made by one skilled in the art, and the application is therefore not to be limited to the particular details and examples shown and described herein, without departing from the general concepts defined by the claims and the equivalents thereof.
Claims (1)
1. The detection method using the inflatable capsule structure is characterized in that the inflatable capsule structure for detecting the pipeline shape comprises the following steps:
the inflatable capsule is provided with an inflation/deflation nozzle, and is tightly attached to the pipeline after being inflated;
the plurality of distributed optical fiber space attitude monitoring sensors are distributed on the inner wall of the inflatable capsule at equal intervals along the circumferential direction of the inflatable capsule; the distributed optical fiber space attitude monitoring sensor comprises a single-model strain optical fiber and a single-mode temperature optical fiber, wherein the single-model strain optical fiber is used for testing strain information of corresponding positions, and the single-mode temperature optical fiber is used for calculating temperature compensation;
the distributed optical fiber space attitude monitoring sensor comprises a plurality of measuring point units which are connected in series; the measuring point unit comprises:
a polymer composite bar;
four single-mode strain optical fibers are distributed at intervals of 90 degrees along the outer circumferential direction of the polymer composite rib;
the single-mode temperature strain optical fiber is coaxially positioned at the center of the high polymer composite rib and is used for testing the temperature compensation of the environment temperature and the four single-mode strain optical fibers;
3-4 distributed optical fiber space attitude monitoring sensors are circumferentially distributed on the inner wall of the inflatable capsule structure at equal angles;
the high polymer composite ribs of the distributed optical fiber space attitude monitoring sensor are limited through stiffening ribs, and certain gaps are formed between the stiffening ribs and the high polymer composite ribs;
the outer wall of the inflatable capsule is provided with scales;
the stiffening ribs form a cavity for accommodating the polymer composite ribs, two ends of the cavity are sealed through the end covers, the transmission optical cable signal wires of the measuring point units penetrate out of the end covers, and the cavity is communicated with the inner space of the inflatable capsule;
the method comprises the following steps:
s1, in the casting process of the segmental beam, after the steel reinforcement framework is placed in the template, connecting the plastic corrugated pipe with the fixed template and the matched beam through the fixing function of the steel reinforcement framework, and completing the positioning and fixing of the plastic corrugated pipe, so that the initial line shape of the pipeline can be determined;
s2, penetrating an inflatable capsule from a hole channel at one side of the matching beam until the tail part of the inflatable capsule is tightly fixed with an end die, recording an initial strain value of the distributed optical fiber space posture monitoring sensor and an inlet position of the inflatable capsule at the hole channel end, and determining a pipeline linear initial position through the surface scale of the inflatable capsule;
s3, filling rated air pressure into the inflatable capsule, pouring cast-in-situ beam concrete, and removing the mould after curing, wherein the sensor in the inflatable capsule and the pipeline structure cooperatively deform during the curing;
s4, reading data of each measuring point of the plurality of distributed optical fiber space gesture monitoring sensors through a signal line, obtaining space information of the distributed optical fiber space gesture monitoring sensors in a plurality of directions through a strain-curvature relation, fitting measuring point coordinates of the plurality of distributed optical fiber space gesture monitoring sensors, and obtaining the axis line shape of the pipeline;
s5, comparing the final centreline shape of the pipeline with the design line shape to obtain the maximum deviation displacement so as to control the axis precision of the pipeline; the inflatable capsule is extracted after decompression.
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| CN202111518753.8A CN114111617B (en) | 2021-12-13 | 2021-12-13 | Inflatable capsule structure for detecting pipeline linearity and detection method |
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