CN112033461A - Multi-point continuous measuring device and method for large-span concrete beam - Google Patents
Multi-point continuous measuring device and method for large-span concrete beam Download PDFInfo
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- CN112033461A CN112033461A CN202010885587.4A CN202010885587A CN112033461A CN 112033461 A CN112033461 A CN 112033461A CN 202010885587 A CN202010885587 A CN 202010885587A CN 112033461 A CN112033461 A CN 112033461A
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- 239000013307 optical fiber Substances 0.000 claims abstract description 22
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- 239000000835 fiber Substances 0.000 claims description 17
- 102100040287 GTP cyclohydrolase 1 feedback regulatory protein Human genes 0.000 claims description 10
- 101710185324 GTP cyclohydrolase 1 feedback regulatory protein Proteins 0.000 claims description 10
- 239000003638 chemical reducing agent Substances 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 8
- 238000005259 measurement Methods 0.000 claims description 5
- 238000012423 maintenance Methods 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 238000004806 packaging method and process Methods 0.000 claims description 3
- 238000004804 winding Methods 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 abstract description 5
- 238000012360 testing method Methods 0.000 abstract description 4
- 238000001514 detection method Methods 0.000 description 4
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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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
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/24—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet
- G01L1/242—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet the material being an optical fibre
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L3/00—Measuring torque, work, mechanical power, or mechanical efficiency, in general
Abstract
The invention discloses a multipoint continuous measuring device and a multipoint continuous measuring method for a large-span concrete beam, wherein the multipoint continuous measuring device comprises an internal fixed point type strain optical cable, a reinforcement cage and an optical fiber cable demodulator; the internal fixed point type strain optical cable is bound on a main reinforcement of the reinforcement cage and is poured into the concrete beam; the internal fixed point type strain cable is connected to the optical fiber cable demodulator; the internal fixed point type strain optical cable comprises an optical cable inner core, an internal fixed point FBG sensor, an optical cable sheath, an armored pipe and a steel strand; the plurality of inner fixed point FBG sensors are uniformly distributed on the inner core of the optical cable and are wrapped in the optical cable by the armor tube; the cable sheath wraps the armor tube wound with a plurality of steel strands; the number of the inner fixed point FBG sensors of a single inner fixed point type strain optical cable reaches 2000, so that multi-point intensive continuous testing of a large-span concrete structure is realized; the temperature sensing optical cable and the internal fixed point type strain optical cable are distributed up and down symmetrically along the main rib of the reinforcement cage; the optical fiber cable demodulator can acquire a plurality of data simultaneously, thereby realizing the monitoring of the internal force, the bending moment, the deflection and the like of the concrete beam.
Description
Technical Field
The invention relates to the field of monitoring of large-span concrete beams, in particular to a multi-point continuous measuring device and a measuring method for a large-span concrete beam.
Background
The optical fiber sensing technology is a novel sensing technology which takes light as a carrier and optical fiber as a medium to sense and transmit external signals and is rapidly developed along with the development of optical fiber and optical fiber communication technology in the eighties of the twentieth century, and is applied to various aspects of civil engineering in recent years.
At present, a point type strain gauge, electromagnetic induction or manual inspection method is generally adopted for traditional monitoring of a large-span beam structure in a large-scale hub structure, and the defects that the survival rate is low, the functionality is unstable, the requirement on detection personnel is high, and the safety operation of the detection personnel is difficult to guarantee exist. Compared with the traditional conventional sensor, the optical fiber sensing technology has good electromagnetic interference resistance, can realize large-range and long-distance real-time monitoring, avoids the irrationality of artificial experience judgment, greatly reduces the probability of missed measurement and missed report, and provides timely and accurate important information; however, most of fiber gratings are packaged into a single-point strain gauge at present, only one area can be detected, and the fiber gratings are not suitable for multi-point continuous measurement of a large-span beam.
Disclosure of Invention
The invention mainly solves the technical problems that: the multi-point continuous measuring device and the measuring method for the large-span concrete beam can achieve multi-point continuous measurement of the large-span concrete beam.
In order to solve the main technical problems, the following technical scheme is adopted:
a multipoint continuous measuring device for a large-span concrete beam comprises an internal fixed point type strain optical cable, a reinforcement cage and an optical fiber cable demodulator; the internal fixed point type strain optical cable is bound on a main reinforcement of the reinforcement cage and is poured into the concrete beam along with the main reinforcement of the reinforcement cage; the end part of the internal fixed point type strain optical cable extends to the outside of the concrete beam and is connected into an optical fiber cable demodulator; the internal fixed point type strain optical cable comprises an optical cable inner core, an internal fixed point FBG sensor, an optical cable sheath, an armored pipe and a steel strand; the plurality of inner fixed point FBG sensors are densely and uniformly distributed on the inner core of the optical cable; the armored pipe wraps the optical cable inner core and the plurality of inner fixed point FBG sensors; a plurality of steel strands are wound on the outer side of the armor pipe; the cable jacket wraps the armor tube wrapped with the plurality of steel strands.
Preferably, the steel reinforcement cage main reinforcement is also bundled with a temperature sensing optical cable; the temperature sensing optical cable and the internal fixed point type strain optical cable are distributed up and down symmetrically along the main rib of the reinforcement cage; the fiber core of the temperature sensing optical cable is packaged by GFRP material, and the outer sides of the fiber core and the fiber core are also wrapped by optical cable sheaths.
Preferably, the internal fixed point type strain cables are distributed along the surface of the reinforcement cage in a U shape, and the head end and the tail end of each strain cable extend out of the same surface of the reinforcement cage; the temperature sensing optical cables are also distributed along the surface of the reinforcement cage in a U shape, and the head end and the tail end of the temperature sensing optical cables extend out of the extending plane of the internal fixed point type strain optical cable in the reinforcement cage.
Preferably, reinforced steel pipes are sleeved at the head and tail ends of the internal fixed point type strain optical cable and the temperature sensing optical cable which are positioned at the same main reinforcement bar of the reinforcement cage; the reinforced steel pipe is positioned at the position where the internal fixed point type strain optical cable and the temperature sensing optical cable extend out of the concrete; the end part of the reinforced steel pipe far away from the inner side of the steel reinforcement cage is connected with the reducer union through a PVC pipe.
Preferably, the bent positions of the internal fixed point type strain optical cable and the temperature sensing optical cable are both sleeved with bent PU pipes.
Preferably, the distance between two adjacent inner fixed point FBG sensors is 1 m; the number of the inner fixed point FBG sensors of the single inner fixed point type strain optical cable is less than or equal to 2000; the inner fixed point FBG sensor adopts a direct writing mode, and the measuring range is 0-20000 mu.
A measuring method of a large-span concrete beam multipoint continuous measuring device comprises the following steps:
s1: sequentially packaging a plurality of inner fixed point FBG sensors at fixed points on the outer side of the optical cable inner core according to the interval of 1m, and wrapping the optical cable inner core and the plurality of inner fixed point FBG sensors in an armored pipe; winding a plurality of steel strands on the outer side of the armor pipe; finally, the armor pipe and the wound stranded steel wires are wrapped in the optical cable sheath to form an internal fixed point type strain optical cable;
s2: the fiber core of the temperature sensing optical cable is packaged and reinforced by GFRP material, and the cable core and the GFRP are wrapped by the optical cable sheath to form the temperature sensing optical cable;
s3: in the manufacturing process of the steel reinforcement cage, the internal fixed point type strain optical cable and the temperature sensing optical cable are fixed on a steel reinforcement cage main rib in an up-down symmetrical mode and are kept in a stretched straight state all the time; distributing the internal fixed point type strain optical cable and the temperature sensing optical cable along the U-shaped steel reinforcement cage, wherein the head end and the tail end of the internal fixed point type strain optical cable and the tail end of the temperature sensing optical cable extend out of the same surface of the steel reinforcement cage; sleeving reinforced steel pipes on the outer sides of the internal fixed point type strain optical cable and the temperature sensing optical cable which are positioned on the same steel reinforcement cage main reinforcement; the outer side of the strong steel pipe is connected with the reducer union through a PVC pipe;
s4: pouring the reinforcement cage with the bundled internal fixed point type strain optical cable and temperature sensing optical cable into the concrete beam, and fixing the reinforced steel pipe at the position where the internal fixed point type strain optical cable and the temperature sensing optical cable extend out of the concrete in the process; after the pouring is finished, waiting for the concrete to be cured and molded;
s5: after the maintenance period of the concrete beam, the signals of the internal fixed point type strain optical cable and the temperature sensing optical cable are led to the optical fiber cable demodulator by using the lead optical cable, and the physical quantities such as internal force, bending moment, deflection and the like of the large-span concrete beam are detected by using the optical fiber cable demodulator.
Preferably, the step S3 further includes sleeving the bent PU tube at the bending position of the inner fixed-point strain cable and the bending position of the temperature sensing cable.
Compared with the prior art, the method for detecting the large-span concrete beam has the following advantages that:
(1) the internal fixed point type strain optical cable adopts the armored pipe and the stranded steel wires to improve the overall strength, so that the tensile strength of the cable is greater than 2000N, and the flexibility of the internal fixed point type strain optical cable is ensured; the internal fixed point type strain optical cable and the temperature sensing optical cable are distributed along the reinforcement cage in a U shape, and reinforced steel pipes, reducing joints and the like are additionally arranged at the positions where the reinforcement cage and the temperature sensing optical cable extend out of concrete, so that the construction damage of the outgoing line position can be effectively prevented.
(2) The number of the internal fixed point FBG sensors of a single internal fixed point type strain optical cable can reach 2000, so that multi-point intensive continuous testing of a large-span concrete structure is realized, the distance between two adjacent internal fixed point FBG sensors is 1m, and the capability of resisting local large deformation of side view points is improved; the inner fixed point FBG sensor adopts a direct writing mode without peeling off a coating layer, so that the measuring range of the inner fixed point FBG sensor is greatly increased from 0-5000 mu to 0-20000 mu.
(3) The temperature sensing optical cable is packaged and protected by the GFRP material, so that the stress influence degree of the temperature sensing optical cable is greatly weakened, and the temperature compensation test effect is improved; the fiber optic cable demodulator can acquire strain data of a plurality of internally-fixed FBG sensors and a plurality of data of the temperature sensing optical cable, so that monitoring of internal force, bending moment, deflection and the like of the concrete beam is synchronously realized.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some examples of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive labor.
FIG. 1 is a schematic view of an embodiment of the present invention illustrating an unfinished concrete structure;
fig. 2 is a schematic structural view of an internal fixed-point strain cable according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of the fiber optic cable demodulator for detecting a point according to the embodiment of the present invention.
In the figure: the steel reinforcement cage is 1, the internal fixed point type strain optical cable is 2, the optical cable inner core is 21, the internal fixed point FBG sensor is 22, the armor pipe is 23, the steel strand is 24, the optical cable sheath is 25, the temperature sensing optical cable is 3, the steel reinforcement pipe is 4, the reducer union is 5, the PVC pipe is 6, and the optical fiber cable demodulator is 7.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. In addition, all the connection relations mentioned herein do not mean that the components are directly connected, but mean that a better connection structure can be formed by adding or reducing connection accessories according to specific implementation conditions.
Referring to fig. 1-3, a multi-point continuous measuring device for a large-span concrete beam comprises an internal fixed point type strain optical cable 2, a reinforcement cage 1 and an optical fiber cable demodulator 7; the internal fixed point type strain optical cable 2 comprises an optical cable inner core 21, an internal fixed point FBG sensor 22, an optical cable sheath 25, an armored pipe 23 and a steel strand 24; the plurality of inner fixed point FBG sensors 22 are densely and uniformly distributed on the optical cable inner core 21, each inner fixed point FBG sensor 22 is packaged on the optical cable inner core 21 at a fixed point according to the prior art, the distance between two adjacent inner fixed point FBG sensors 22 is 1m, and the inner fixed point FBG sensors 22 adopt a direct inscription mode without stripping a coating layer, so that the measuring range of the inner fixed point FBG sensors 22 is increased from 0-5000 mu to 0-20000 mu; in order to realize multi-point intensive continuous testing of a large-span concrete structure, the number of the inner fixed point FBG sensors 22 of a single inner fixed point type strain optical cable 2 can reach 2000; the armor tube 23 wraps the optical cable inner core 21 and the plurality of inner fixed point FBG sensors 22; the armored pipe 23 wound with the stranded steel strands 24 is wrapped in the optical cable sheath 25, and the material of the optical cable sheath 25 can be selected according to the prior art; the steel strands 24 are wound on the outer side of the armor tube 23, the armor tube 23 and the steel strands 24 are both used for improving the overall strength of the internal fixed point type strain optical cable 2, after the steel strands 24 are wound, the tensile strength is larger than 2000N through actual measurement, and the flexibility of arrangement is guaranteed.
Binding the internal fixed point type strain optical cable 2 on a main rib of a reinforcement cage 1 by using a 5 x 300 nylon binding tape, binding a temperature sensing optical cable 3 on the main rib of the reinforcement cage 1, fixing the temperature sensing optical cable 3 and the internal fixed point type strain optical cable 2 on the reinforcement cage 1 by adopting a cross binding process, and keeping the temperature sensing optical cable 3 and the internal top point type strain optical cable in a stretched straight state all the time in the binding process; the fiber core of the temperature sensing optical cable 3 is a bare fiber, the bare fiber is packaged by a GFRP material, and the outer side of the packaged bare fiber is wrapped by an optical cable sheath 25; thereby forming a temperature sensing optical cable 3; the temperature sensing optical cable 3 and the internal fixed point type strain optical cable 2 are distributed along the main rib of the same reinforcement cage 1 in an up-and-down symmetrical manner; the binding mode of the reinforcement cage 1 can be realized according to the prior art; the internal fixed point type strain optical cables 2 are distributed along the surface of the reinforcement cage 1 in a U shape, and the head end and the tail end of each strain optical cable extend out of the same surface of the reinforcement cage 1; the reinforcement cage 1 is in a cuboid structural form, and two U-shaped ends of the internal vertex-mode strain optical cable respectively correspond to the main reinforcements of the two reinforcement cages 1; the temperature sensing optical cables 3 are also distributed along the surface of the reinforcement cage 1 in a U shape, and the head end and the tail end of each temperature sensing optical cable extend out of one plane of the reinforcement cage 1; the plane of the temperature sensing optical cable 3 extending out of the reinforcement cage 1 from head to tail and the plane of the internal fixed point type strain optical cable 2 extending out of the reinforcement cage 1 from head to tail are the same plane, namely the temperature sensing optical cable 3 and the internal fixed point type strain optical cable 2 are always kept parallel and are vertically symmetrical along the main bar of the reinforcement cage 1; in order to ensure the strength of the inner fixed point type strain optical cable 2 and the temperature sensing optical cable 3 at the bending positions, the bending positions of the inner fixed point type strain optical cable 2 and the temperature sensing optical cable 3 are both sleeved with PU pipes with elbows, and the inner diameters of the PU pipes are 8 mm.
The head and tail ends of the internal fixed point type strain optical cable 2 and the temperature sensing optical cable 3 which are positioned on the main rib of the same reinforcement cage 1 are sleeved with reinforced steel pipes 4; the end part of the reinforced steel pipe 4 far away from the inner side of the steel reinforcement cage 1 is connected with a reducer union 5 through a PVC pipe 6; one end of the PVC pipe 6 is sleeved at the end part of the outer side of the reinforced steel pipe 4, the other end of the PVC pipe is sleeved at the outer side of the reducer union 5, the inner diameter of the reinforced steel pipe 4 is 3cm, and the wall thickness is 5 mm; pouring the reinforcement cage 1 with the internal fixed point type strain optical cable 2 and the temperature sensing optical cable 3 bundled together into a concrete beam, wherein a vibrating rod is prevented from directly vibrating the internal fixed point type strain optical cable 2 and the temperature sensing optical cable 3 in the pouring process, and the reinforced steel pipe 4 is positioned at the position where the internal fixed point type strain optical cable 2 and the temperature sensing optical cable 3 extend out of the concrete; the arrangement of the reinforced steel pipe 4, the reducer union 5 and the PVC pipe 6 can effectively prevent the construction damage of the outgoing line position; after the pouring is finished, the concrete structure is maintained and molded, and after the maintenance is finished, the wire jumper is dissolved at the end parts of the internal fixed point type strain optical cable 2 and the temperature sensing optical cable 3 by the lead diaphragm and is connected to the optical fiber cable demodulator 7; the optical fiber cable demodulator 7 can detect data from the internal fixed point type strain cable 2 and the temperature sensing cable 3, so that the automatic detection of the internal force, the bending moment, the deflection and the like of the concrete beam is realized.
The working process of the invention is as follows: assembling the internal fixed point type strain optical cable 2: sequentially packaging a plurality of inner fixed point FBG sensors 22 on the outer side of the optical cable inner core 21 at fixed points according to the distance of 1m, and wrapping the optical cable inner core 21 and the plurality of inner fixed point FBG sensors 22 in an armored pipe 23; winding a plurality of steel strands 24 on the outer side of the armor pipe 23; finally, the armor pipe 23 and the wound stranded steel wires 24 are wrapped by the optical cable sheath 25 to form the internal fixed point type strain optical cable 2;
assembly of the temperature sensing optical cable 3: the fiber core of the temperature sensing optical cable 3 is packaged and reinforced by GFRP material, and the cable core and the GFRP are wrapped by the optical cable sheath 25 to form the temperature sensing optical cable 3;
internal fixed point type strain cable 2 and temperature sensing cable 3 to reinforcement cage 1: in the manufacturing process of the reinforcement cage 1, the internal fixed point type strain optical cable 2 and the temperature sensing optical cable 3 are symmetrically fixed on a main reinforcement of the reinforcement cage 1 from top to bottom and the internal fixed point type strain optical cable 2 and the temperature sensing optical cable 3 are kept in a stretched straight state all the time; the internal fixed point type strain optical cable 2 and the temperature sensing optical cable 3 are distributed along the steel reinforcement cage 1 in a U shape, and the head end and the tail end of the internal fixed point type strain optical cable 2 and the tail end of the temperature sensing optical cable 3 extend out of the same surface of the steel reinforcement cage 1; the PU pipe of the elbow is sleeved at the bending position of the internal fixed point type strain optical cable 2 and the bending position of the temperature sensing optical cable 3; sleeving a reinforced steel pipe 4 outside an inner fixed point type strain optical cable 2 and a temperature sensing optical cable 3 which are positioned on the main rib of the same reinforcement cage 1; the outer side of the strong steel pipe is sleeved with a PVC pipe 6, and the other side of the PVC pipe 6 is sleeved on the outer side of the reducing joint 5;
pouring concrete: pouring the reinforcement cage 1 bundled with the internal fixed point type strain optical cable 2 and the temperature sensing optical cable 3 into the concrete beam, and fixing the reinforced steel pipe 4 at the position where the internal fixed point type strain optical cable 2 and the temperature sensing optical cable 3 extend out of the concrete in the process; after the pouring is finished, waiting for the concrete to be cured and molded;
continuous detection of the large-span concrete beam: after the maintenance period of the concrete beam, the signals of the internal fixed point type strain optical cable 2 and the temperature sensing optical cable 3 are led to the optical fiber cable demodulator 7 by using the lead optical cable, and the physical quantities such as internal force, bending moment, deflection and the like of the large-span concrete beam are detected by using the optical fiber cable demodulator 7.
It should be noted that the terms "upper, lower, left, right, inner and outer" in the present invention are defined based on the relative positions of the components in the drawings, and are only used for clarity and convenience of the technical solution, and it should be understood that the application of the terms of orientation does not limit the scope of the present application.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.
Claims (8)
1. The utility model provides a long-span concrete beam multiple spot continuous measurement device which characterized in that: the device comprises an internal fixed point type strain optical cable, a reinforcement cage and an optical fiber cable demodulator; the internal fixed point type strain optical cable is bound on a main reinforcement of the reinforcement cage and is poured into the concrete beam along with the main reinforcement of the reinforcement cage; the end part of the internal fixed point type strain optical cable extends to the outside of the concrete beam and is connected into an optical fiber cable demodulator; the internal fixed point type strain optical cable comprises an optical cable inner core, an internal fixed point FBG sensor, an optical cable sheath, an armored pipe and a steel strand; the plurality of inner fixed point FBG sensors are densely and uniformly distributed on the inner core of the optical cable; the armored pipe wraps the optical cable inner core and the plurality of inner fixed point FBG sensors; a plurality of steel strands are wound on the outer side of the armor pipe; the cable jacket wraps the armor tube wrapped with the plurality of steel strands.
2. The multi-point continuous measuring device for the large-span concrete beam according to claim 1, characterized in that: temperature sensing optical cables are also tied on the main reinforcement of the reinforcement cage; the temperature sensing optical cable and the internal fixed point type strain optical cable are distributed up and down symmetrically along the main rib of the reinforcement cage; the fiber core of the temperature sensing optical cable is packaged by GFRP material, and the outer sides of the fiber core and the fiber core are also wrapped by optical cable sheaths.
3. The multi-point continuous measuring device for the large-span concrete beam according to claim 2, characterized in that: the internal fixed point type strain optical cables are distributed along the surface of the reinforcement cage in a U shape, and the head end and the tail end of each strain optical cable extend out of the same surface of the reinforcement cage; the temperature sensing optical cables are also distributed along the surface of the reinforcement cage in a U shape, and the head end and the tail end of the temperature sensing optical cables extend out of the extending plane of the internal fixed point type strain optical cable in the reinforcement cage.
4. The multi-point continuous measuring device for the large-span concrete beam according to claim 2, characterized in that: reinforced steel pipes are sleeved at the head and tail ends of the internal fixed point type strain optical cable and the temperature sensing optical cable which are positioned on the same steel reinforcement cage main rib; the reinforced steel pipe is positioned at the position where the internal fixed point type strain optical cable and the temperature sensing optical cable extend out of the concrete; the end part of the reinforced steel pipe far away from the inner side of the steel reinforcement cage is connected with the reducer union through a PVC pipe.
5. The multi-point continuous measuring device for the large-span concrete beam according to claim 2, characterized in that: the bending positions of the internal fixed point type strain optical cable and the temperature sensing optical cable are both sleeved with PU pipes with elbows.
6. The multi-point continuous measuring device for the large-span concrete beam according to claim 1, characterized in that: the distance between two adjacent inner fixed point FBG sensors is 1 m; the number of the inner fixed point FBG sensors of the single inner fixed point type strain optical cable is less than or equal to 2000; the inner fixed point FBG sensor adopts a direct writing mode, and the measuring range is 0-20000 mu.
7. The measuring method of the multi-point continuous measuring device for the large-span concrete beam according to any one of claims 1 to 6, is characterized in that: the method comprises the following steps:
s1: sequentially packaging a plurality of inner fixed point FBG sensors at fixed points on the outer side of the optical cable inner core according to the interval of 1m, and wrapping the optical cable inner core and the plurality of inner fixed point FBG sensors in an armored pipe; winding a plurality of steel strands on the outer side of the armor pipe; finally, the armor pipe and the wound stranded steel wires are wrapped in the optical cable sheath to form an internal fixed point type strain optical cable;
s2: the fiber core of the temperature sensing optical cable is packaged and reinforced by GFRP material, and the cable core and the GFRP are wrapped by the optical cable sheath to form the temperature sensing optical cable;
s3: in the manufacturing process of the steel reinforcement cage, the internal fixed point type strain optical cable and the temperature sensing optical cable are fixed on a steel reinforcement cage main rib in an up-down symmetrical mode and are kept in a stretched straight state all the time; distributing the internal fixed point type strain optical cable and the temperature sensing optical cable along the U-shaped steel reinforcement cage, wherein the head end and the tail end of the internal fixed point type strain optical cable and the tail end of the temperature sensing optical cable extend out of the same surface of the steel reinforcement cage; sleeving reinforced steel pipes on the outer sides of the internal fixed point type strain optical cable and the temperature sensing optical cable which are positioned on the same steel reinforcement cage main reinforcement; the outer side of the strong steel pipe is connected with the reducer union through a PVC pipe;
s4: pouring the reinforcement cage with the bundled internal fixed point type strain optical cable and temperature sensing optical cable into the concrete beam, and fixing the reinforced steel pipe at the position where the internal fixed point type strain optical cable and the temperature sensing optical cable extend out of the concrete in the process; after the pouring is finished, waiting for the concrete to be cured and molded;
s5: after the maintenance period of the concrete beam, the signals of the internal fixed point type strain optical cable and the temperature sensing optical cable are led to the optical fiber cable demodulator by using the lead optical cable, and the physical quantities such as internal force, bending moment, deflection and the like of the large-span concrete beam are detected by using the optical fiber cable demodulator.
8. The measuring method of the multi-point continuous measuring device for the large-span concrete beam according to claim 7, characterized in that: and the step S3 further comprises the step of sleeving the bent PU pipe at the bending position of the internal fixed point type strain optical cable and the bending position of the temperature sensing optical cable.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112761195A (en) * | 2021-01-18 | 2021-05-07 | 中铁五局集团第五工程有限责任公司 | Foundation pit concrete beam support body crack monitoring device and monitoring method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112761195A (en) * | 2021-01-18 | 2021-05-07 | 中铁五局集团第五工程有限责任公司 | Foundation pit concrete beam support body crack monitoring device and monitoring method thereof |
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