CN112857290B - Method for measuring transverse displacement of pull rod type expansion joint - Google Patents
Method for measuring transverse displacement of pull rod type expansion joint Download PDFInfo
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- CN112857290B CN112857290B CN202110115513.7A CN202110115513A CN112857290B CN 112857290 B CN112857290 B CN 112857290B CN 202110115513 A CN202110115513 A CN 202110115513A CN 112857290 B CN112857290 B CN 112857290B
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- Prior art keywords
- expansion joint
- pull rod
- rod type
- type expansion
- transverse displacement
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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
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/02—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L51/00—Expansion-compensation arrangements for pipe-lines
- F16L51/02—Expansion-compensation arrangements for pipe-lines making use of bellows or an expansible folded or corrugated tube
- F16L51/028—Expansion-compensation arrangements for pipe-lines making use of bellows or an expansible folded or corrugated tube with the expansion or contraction of each corrugation being limited
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L51/00—Expansion-compensation arrangements for pipe-lines
- F16L51/02—Expansion-compensation arrangements for pipe-lines making use of bellows or an expansible folded or corrugated tube
- F16L51/03—Expansion-compensation arrangements for pipe-lines making use of bellows or an expansible folded or corrugated tube comprising two or more bellows
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Length Measuring Devices With Unspecified Measuring Means (AREA)
Abstract
A method for measuring transverse displacement of a pull rod type expansion joint comprises the steps of 1, constructing the pull rod type expansion joint, 2, arranging a pull rope sensor, and 3, measuring transverse displacement data. The signal processing control box realizes the calculation and measurement of the transverse displacement of the pull rod type expansion joint by utilizing the plane deflection angle according to the transverse displacement calculation formula and the data measured by the pull rope sensor, and the measurement structure and the measurement method are simple and can adapt to complex installation conditions.
Description
Technical Field
The invention relates to the field of pressure pipelines, in particular to a method for measuring transverse displacement of a pull rod type expansion joint.
Background
The expansion joint is used as a compensator of the pressure pipeline, can compensate thermal deformation, mechanical deformation and the like of the pipeline, and plays a role in reducing the stress of the pipeline and prolonging the service life of the pipeline. The pull rod type expansion joint is mainly used for compensating transverse displacement due to the structural characteristics. In practical application, the expansion joint may deviate from a design working condition, the actual transverse displacement of the expansion joint may exceed a design compensation amount to cause failure phenomena such as rupture, instability, leakage and the like of the expansion joint, and once the expansion joint fails, the safe operation of a pipeline is affected. Therefore, the design of the expansion joint displacement detection device is very important, and particularly the device capable of adapting to the working condition of the direct-buried expansion joint is more important.
At present, the displacement detection of the expansion joint mainly takes appliance measurement as a main part, and the axial displacement of the axial expansion joint can be measured by a pull rope displacement sensor fixed at two ends. For the pull rod type expansion joint, the measurement reference is not easy to determine, and the transverse displacement measurement is difficult.
Disclosure of Invention
In order to solve the technical problems, the invention provides a method for measuring the transverse displacement of the pull rod type expansion joint, which is simple in measurement structure and method and can adapt to complex installation conditions.
In order to realize the technical purpose, the adopted technical scheme is as follows: a method for measuring the transverse displacement of a pull rod type expansion joint comprises the following steps:
step 1, constructing a pull rod type expansion joint
The pull rod type expansion joint comprises a middle pipe, corrugated pipes, end pipes and pull rod assemblies, wherein two ends of the middle pipe are respectively connected with one completely consistent corrugated pipe, the other ends of the two corrugated pipes are connected with the end pipes, and the pull rod assemblies are arranged on the outer sides of the middle pipe, the corrugated pipes and the end pipes;
step 2, setting a pull rope sensor
The pull rod type expansion joint is in a non-displacement state, the moving end of the pull rope sensor is connected to the end pipe ring plate, the fixed end of the pull rope sensor is connected to the middle pipe ring plate in the center of the middle pipe, the stretching direction of the pull rope sensor is consistent with the axial direction of the middle pipe of the expansion joint and is perpendicular to the plane of the middle pipe ring plate, and the signal output end of the pull rope sensor is connected with a signal processing control box with calculation and display functions;
step 3, measuring transverse displacement data
The signal processing control box realizes the calculation and measurement of the transverse displacement delta y of the pull rod type expansion joint by utilizing a plane deflection angle according to a transverse displacement calculation formula and data measured by a pull rope sensor, and the specific calculation steps are as follows:
Δy＝2*Δb+Δp
Δ p ＝L p ·sinθ
wherein Δ b is the lateral displacement of the bellows, Δ p is the lateral displacement of the intermediate tube, L b Is the length of the bellows, L p Theta is the length of the intermediate tube and theta is the angle of lateral deflection of the plane of the intermediate tube.
The invention has the beneficial effects that:
1) The displacement measuring device can be used for detecting the transverse displacement of the expansion joint of a pull rod type or other similar types.
2) The structure is simple, the installation is convenient, the adaptability is strong, and the device can be used under high-temperature working conditions or suspended installation positions.
3) Need not artifical measurement and reading, directly realize signal of telecommunication teletransmission, guarantee maintenance efficiency and personnel's safety.
Drawings
FIG. 1 is a schematic view of the installation of the present invention;
FIG. 2 is a diagram of the lateral displacement measurement operation of the present invention;
FIG. 3 is a schematic diagram of the lateral displacement calculation of the present invention;
in the figure: the system comprises 1-end pipe, 2-end pipe ring plate, 3-stay rope sensor moving end, 4-pull rod assembly, 5-stay rope sensor fixing end, 6-middle pipe ring plate, 7-middle pipe, 8-corrugated pipe and 9-signal processing control box.
Detailed Description
The invention is described in connection with the drawings and the detailed description. However, the present invention is not limited to these examples, and can be applied to other pipes having the same working conditions.
As shown in fig. 1, the tie rod type expansion joint of the present embodiment includes an end pipe 1, an end pipe annular plate 2, a tie rod assembly 4, an intermediate pipe annular plate 6, an intermediate pipe 7, and a bellows 8. Two ends of the middle pipe are respectively connected with a completely consistent corrugated pipe, the other ends of the two corrugated pipes are connected with end pipes, and pull rod assemblies are arranged on the outer sides of the end pipe 1, the middle pipe 7 and the corrugated pipe 8. The pull rod type expansion joint is in a non-displacement state, the fixed end 5 of the pull rope sensor is fixedly arranged on the middle pipe annular plate 6, the moving end 3 of the pull rope sensor moves on the end pipe annular plate 2, the pull rope is guaranteed to be perpendicular to the plane of the middle pipe annular plate 6 all the time, and the stretching direction of the pull rope sensor is consistent with the axial direction of the middle pipe 7 of the expansion joint. The pull rope sensor is provided with a signal processing control box 9, so that the functions of signal processing and remote transmission can be realized, and the acquired signals of the pull rope sensor are calculated and displayed as transverse displacement data.
As shown in fig. 2, when the apparatus is driven, the temperature of the medium increases, causing the temperature of the pipe to increase, and the pipe thermally expands. The pull rod type expansion joint compensates the transverse displacement of the pipeline, and the two ends of the pipeline are transversely dislocated. Due to the flexibility of the bellows 7, the intermediate pipe 6 and the intermediate pipe ring plate 5 deflect, and the intermediate pipe 6 deflects at an angle θ relative to the plane of the end pipe ring plate 2, as shown in fig. 2. The included angle between the two planes is equal to the included angle of the normal vector. The moving end 3 of the stay cord sensor moves to ensure that the fixed end 5 of the stay cord sensor is always vertical to the plane of the ring plate of the middle tube, similar to a plane normal vector, and the angle of the stay cord relative to the initial position after deformation, namely the angle of the horizontal deflection of the plane of the middle tube, can be calculated by measuring the extension delta of the stay cord according to the Pythagorean theorem.
As shown in fig. 3, the tie-rod type expansion joint is laterally displaced by Δ y =2 × Δ b + Δ p. Wherein
Δ p ＝L p Sin θ. According to the calculation formula, the calculation of the transverse displacement of the pull rod type expansion joint can be realized through the plane deflection angle.
Claims (1)
1. A method for measuring the transverse displacement of a pull rod type expansion joint is characterized by comprising the following steps: the method comprises the following steps:
step 1, constructing a pull rod type expansion joint
The pull rod type expansion joint comprises a middle pipe, corrugated pipes, end pipes and pull rod assemblies, wherein two ends of the middle pipe are respectively connected with one completely consistent corrugated pipe, the other ends of the two corrugated pipes are connected with the end pipes, and the pull rod assemblies are arranged on the outer sides of the middle pipe, the corrugated pipes and the end pipes;
step 2, setting a pull rope sensor
The pull rod type expansion joint is in a non-displacement state, the moving end of the pull rope sensor is connected to the end pipe ring plate, the fixed end of the pull rope sensor is connected to the middle pipe ring plate in the center of the middle pipe, the stretching direction of the pull rope sensor is consistent with the axial direction of the middle pipe of the expansion joint and is perpendicular to the plane of the middle pipe ring plate, and the signal output end of the pull rope sensor is connected with a signal processing control box with calculation and display functions;
step 3, measuring transverse displacement data
The signal processing control box calculates the formula according to the transverse displacement, and utilizes the plane deflection angle to realize the calculation and measurement of the transverse displacement delta y of the pull rod type expansion joint through the data measured by the pull rope sensor, and the specific calculation steps are as follows:
Δy＝2*Δb+Δp
Δ p ＝L p ·sinθ
wherein Δ b is the lateral displacement of the bellows, Δ p is the lateral displacement of the intermediate tube, L b Is the length of the bellows, L p Is the length of the middle tubeAnd degree, θ, is the angle of lateral deflection of the plane of the intermediate tube.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110115513.7A CN112857290B (en) | 2021-01-28 | 2021-01-28 | Method for measuring transverse displacement of pull rod type expansion joint |
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| CN202110115513.7A CN112857290B (en) | 2021-01-28 | 2021-01-28 | Method for measuring transverse displacement of pull rod type expansion joint |
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| CN112857290B true CN112857290B (en) | 2022-10-18 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114370842B (en) * | 2021-12-30 | 2023-11-14 | 山东九纳医疗设备有限公司 | Device for measuring parallelism of two end faces of expansion joint |
| CN115164819B (en) * | 2022-07-25 | 2023-10-27 | 四川建力源工程技术咨询有限公司 | Deformation detection method and system for underground pipeline |
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Address after: 471000 No.27 Zhongzhou West Road, Jianxi District, Luoyang City, Henan Province Applicant after: LUOYANG PETROCHEMICAL ENGINEERING CORPORATION, SINOPEC Applicant after: CSSC Shuangrui (Luoyang) special equipment Co.,Ltd. Address before: 471000 No.27 Zhongzhou West Road, Jianxi District, Luoyang City, Henan Province Applicant before: LUOYANG PETROCHEMICAL ENGINEERING CORPORATION, SINOPEC Applicant before: LUOYANG SUNRUI SPECIAL EQUIPMENT Co.,Ltd. |
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