CN204757917U - Formula string wire strain sensor is buryyed to rigidity adjustable - Google Patents
Formula string wire strain sensor is buryyed to rigidity adjustable Download PDFInfo
- Publication number
- CN204757917U CN204757917U CN201520414391.1U CN201520414391U CN204757917U CN 204757917 U CN204757917 U CN 204757917U CN 201520414391 U CN201520414391 U CN 201520414391U CN 204757917 U CN204757917 U CN 204757917U
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- shell
- rigidity
- string wire
- pillar
- adjustable
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Abstract
The utility model provides a formula string wire strain sensor is buryyed to rigidity adjustable, includes the shell, and an end seat is respectively established at the shell both ends, and tension disk of fixed connection is respectively gone up to every end seat, connects one between two tension disks and can produce resonant string wire, is located the string wire below and is provided with solenoid on the shell, and the outside of shell is equipped with the external screw thread along shell length direction, strain sensor still includes the pillar, and the pillar is hollow ring, and its internal diameter is the same with the external diameter of shell, is equipped with the external screw thread assorted internal thread with the shell on the inner wall of pillar. The utility model discloses beneficial effect: the utility model provides a string wire strain sensor work rigidity can be adjusted, adjusts its rigidity to country rock rigidity when using, has solved traditional sensor and the unmatched problem of country rock rigidity, improves the measuring accuracy.
Description
Technical field
The utility model belongs to civil construction industry, relates to the device of Tunnel Engineering country rock internal strain monitoring, the flush type string wire strain transducer that specifically a kind of rigidity is adjustable.
Background technology
String wire sensor is the important monitoring equipment of Construction of Civil Engineering monitoring.When the small strain that measurement large-sized concrete or steel beam column Long-Time Service produce or the behavior of members under loading under measuring various load action, usually need to use strain transducer and corresponding measuring technique thereof to measure accordingly.In general, current used strain transducer generally can be three classes: resistance strain sensor, vibratory string strain transducer and fibre optic strain sensor.In tunnel excavation process, vibratory string strain transducer is with its good stability, the plurality of advantages such as reliability is high, environmental suitability is strong and extensively should.
Rigidity due to steel string type sensor is a definite value, better in concrete stress-strain measurement effect, but during ess-strain that is inner for rocky tunnel country rock and the first lined internal in tunnel is monitored at present, due to the diversity of tunnel surrounding rigidity, often run into sensor and the unmatched problem of country rock rigidity.If sensor rigidity is greater than country rock rigidity, then sensor cannot reach and country rock deform in same pace, and its deflection is less, accurately cannot measure country rock strain; If sensor rigidity is much smaller than country rock rigidity, then form obvious area of stress concentration around sensor, can measuring accuracy be affected equally.Therefore optimum condition should be sensor rigidity and country rock rigidity is close, the change of country rock internal strain accurately can be measured like this.
Utility model content
Technical problem to be solved in the utility model is to provide the adjustable flush type of a kind of rigidity, solves the sensor and the unmatched problem of country rock rigidity that run at present, thus measures exactly the strain of tunnel surrounding inside point one direction.
The utility model for solving the problems of the technologies described above adopted technical scheme is: the flush type string wire strain transducer that a kind of rigidity is adjustable, comprise shell, shell two ends respectively establish one to hold seat, each end seat is fixedly connected with respectively a tension disk, the string wire that one can produce resonance is connected between two tension disks, be positioned at below string wire and be provided with solenoid on shell, the outside of shell is provided with external thread along outer cover length direction, described strain transducer also comprises pillar, pillar is hollow ring, its internal diameter is identical with the external diameter of shell, the inwall of pillar is provided with the internal thread matched with the external thread of shell.
Externally threaded length described in the utility model is identical with the length of string wire.
Shell described in the utility model is made up of aluminium alloy.
The wall thickness of pillar described in the utility model is 3mm.
The beneficial effects of the utility model are: the utility model structure is simple, convenient and practical.The vibratory string strain transducer improved through design described in the utility model is arranged on country rock to be measured inner, vibrating string type strain measurement mechanism can be used to encourage the vibratory string in above-mentioned vibratory string strain transducer, then the resonant frequency of above-mentioned vibratory string is measured, thus obtain the related physical quantity treated in geodesic structure, its work rigidity can regulate, in use by its stiffness tuning to country rock rigidity, solve traditional sensors and the unmatched problem of country rock rigidity, improve measuring accuracy.
Accompanying drawing explanation
Fig. 1 is the structural representation of the utility model sensor;
Fig. 2 is the sectional view of the utility model pillar;
Mark in figure: 1, shell, 2, end seat, 3, tension disk, 4, string wire, 5, solenoid, 6, external thread, 7, pillar, 8, internal thread.
Embodiment
As shown in the figure, the flush type string wire strain transducer that a kind of rigidity is adjustable, comprise shell 1, shell 1 two ends respectively establish one to hold seat 2, each end seat 2 is fixedly connected with respectively a tension disk 3, the string wire 4 that one can produce resonance is connected between two tension disks 3, be positioned at below string wire 4 and be provided with solenoid 5 on shell 1, the outside of shell 1 is provided with external thread 6 along shell 1 length direction, described strain transducer also comprises pillar 7, pillar 7 is hollow ring, its internal diameter is identical with the external diameter of shell 1, the inwall of pillar 7 is provided with the internal thread 8 matched with the external thread of shell 1.
The length of external thread 6 is identical with the length of string wire 4.
Shell 1 is made up of aluminium alloy.
The wall thickness of pillar 7 is 3mm.
Be placed in magnetic field by applying the string wire 4 of pretightning force, after string wire 4 in addition exciting, string wire 4 will resonate, the string of a musical instrument of resonance makes cutting magnetic line movement in magnetic field, therefore, can induce electromotive force u in pick-up coil, the frequency of induced potential is exactly the resonant frequency of vibratory string.The pressure that the tension force that the resonant frequency of string wire and the string of a musical instrument bear or pulling force and sensor bear or displacement linear, the resonant frequency therefore recording firm string 4 can obtain measured physical quantity (pressure or displacement).Because shell 1 makes material with aluminium alloy, rigidity is less, adjustable for realizing rigidity, additional stiffness-adjustable pillar 7.In use, material is surveyed in base area, determine the elastic modulus of country rock, increase adjustable pillar 7 at sensor outside surface, because adjustable pillar 7 and sensor outer housing 1 adopt screw thread closely to connect, distortion reaches synchronous, often increase an adjustable pillar 7 and increase certain elastic mould value, increasing the rigidity of steel chord type strain transducer with this, by setting the number of adjustable pillar 7, reaching the rigidity of sensor and the object of country rock Rigidity Matching.
Claims (4)
1. the flush type string wire strain transducer that a rigidity is adjustable, comprise shell (1), shell (1) two ends respectively establish one to hold seat (2), each end seat (2) is fixedly connected with respectively a tension disk (3), the string wire (4) that one can produce resonance is connected between two tension disks (3), be positioned at string wire (4) below and be provided with solenoid (5) on shell (1), it is characterized in that: the outside of shell (1) is provided with external thread (6) along shell (1) length direction, described strain transducer also comprises pillar (7), pillar (7) is hollow ring, its internal diameter is identical with the external diameter of shell (1), the inwall of pillar (7) is provided with the internal thread (8) matched with the external thread of shell (1).
2. the flush type string wire strain transducer that a kind of rigidity according to claim 1 is adjustable, is characterized in that: the length of described external thread (6) is identical with the length of string wire (4).
3. the flush type string wire strain transducer that a kind of rigidity according to claim 1 is adjustable, is characterized in that: described shell (1) is made up of aluminium alloy.
4. the flush type string wire strain transducer that a kind of rigidity according to claim 1 is adjustable, is characterized in that: the wall thickness of described pillar (7) is 3mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520414391.1U CN204757917U (en) | 2015-06-16 | 2015-06-16 | Formula string wire strain sensor is buryyed to rigidity adjustable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520414391.1U CN204757917U (en) | 2015-06-16 | 2015-06-16 | Formula string wire strain sensor is buryyed to rigidity adjustable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204757917U true CN204757917U (en) | 2015-11-11 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520414391.1U Expired - Fee Related CN204757917U (en) | 2015-06-16 | 2015-06-16 | Formula string wire strain sensor is buryyed to rigidity adjustable |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204757917U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104897043A (en) * | 2015-06-16 | 2015-09-09 | 洛阳理工学院 | Embedded steel-string strain sensor with adjustable rigidity |
-
2015
- 2015-06-16 CN CN201520414391.1U patent/CN204757917U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104897043A (en) * | 2015-06-16 | 2015-09-09 | 洛阳理工学院 | Embedded steel-string strain sensor with adjustable rigidity |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151111 Termination date: 20160616 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |