CN201885922U - Flexible suspension deflection sensor - Google Patents
Flexible suspension deflection sensor Download PDFInfo
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- CN201885922U CN201885922U CN 201020605758 CN201020605758U CN201885922U CN 201885922 U CN201885922 U CN 201885922U CN 201020605758 CN201020605758 CN 201020605758 CN 201020605758 U CN201020605758 U CN 201020605758U CN 201885922 U CN201885922 U CN 201885922U
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Abstract
The utility model relates to the technical field of nondestructive testing and evaluation of road subgrade surface strength, and particularly discloses a flexible suspension deflection sensor, which comprises a deflection sensor and a bearing plate. The deflection sensor includes a sensor body, an upper sensor plate, an adapter plate and a probe, the probe is fixed to the lower end of the sensor body, the upper sensor plate is fixed to the upper end of the sensor body by a sunk screw, a through hole is arranged in the center of a bottom plate in the bearing plate so that the probe can penetrate through the central through hole of the bottom plate, spring hangers I are distributed at four corners of the upper sensor plate, one end of each of four tension springs is connected with the corresponding one of the four spring hangers I, and the other ends of the four tension springs are fixedly connected with four spring hangers II uniformly distributed on the upper end surface of the bottom plate. The flexible suspension deflection sensor can effectively avoid the influence to defection measurement results by sliding and vibration of the bear plate due to lateral impact force, and the deflection measurement precision of a falling weight type deflectometer adopting the flexible suspension deflection sensor can reach 0.25%.
Description
Technical field
The utility model relates to the Non-Destructive Testing and the assessment technique field of highway subgrade face intensity, is specifically related to a kind of flexible suspension flexure sensor.
Background technology
Recent two decades comes, and Dynamic Non-Destruction Measurement research and development in road surface is subjected to increasingly extensive attention at home and abroad.Flexure is as most important pavement structural strength evaluation index, and its checkout equipment and analytical technology development are very fast.Since nineteen fifty-three invention beam type benkelman beams deflectometer, the pavement deflection checkout equipment has developed into the Falling Weight Deflectometer of simulation driving loading from the static(al) benkelman beams deflectometer, develop into the test of road pavement multiple spot flexure from the maximum deflection test of single-point, and carry out the inverse analysis of each structural sheet elastic modulus of road surface according to multiple spot flexure data, for road surface structare layer designs and evaluation provides foundation.Since the eighties in last century, Falling Weight Deflectometer has obtained increasingly extensive application as Non-Destructive Testing of a kind of subgrade and pavement flexure and valuator device at home and abroad.
The ultimate principle of Falling Weight Deflectometer is that the weight by certain mass freely falls hammering on rubber buffer, the impulsive force that produces acts on the road surface by the loading plate with certain rigidity, measures by a force transducer and one group of flexure sensor suffered impulsive force and the Transient deformation of table of satisfying the need then.The flexure sensor is installed in the central authorities of loading plate, by the Transient deformation on the probe sensing loading plate central point face of land.
The flexure sensor in loading plate central authorities, belongs to rigid attachment by screw retention in the prior art, and the flexure sensor is made up of the elastic damping between shell, sensor main body, probe and shell upper and lower side and the sensor main body.Adopt the benkelman beams deflectometer of this flexure sensor attachment structure to require to test evenness of road surface, drop hammer and keep vertical with rubber buffer, otherwise the following lateral impact power that produces that falls behind causes that inevitably loading plate is in land slide and vibration, because flexure sensor and loading plate are rigid attachment, make that driving probe when loading plate slides slides, cause measuring error to increase, measuring accuracy reduces.
Summary of the invention
The purpose of this utility model is to provide a kind of easy, flexible suspension flexure sensor that reliability is high that is used for Falling Weight Deflectometer, is used to improve the measuring accuracy of highway, airport subgrade and pavement.
The technical solution of the utility model is as follows: flexible suspension flexure sensor, comprise flexure sensor and loading plate, wherein, the flexure sensor comprises sensor main body, sensor upper plate, card extender and probe, probe is fixed on the lower end of sensor main body by card extender, and the sensor upper plate is fixed on the upper end of sensor main body by sunk screw; Base plate center in the loading plate has through hole, can make probe pass the base plate central through hole, on four angles of sensor upper plate, be distributed with four spring suspension ring I, four extension spring one ends are connected with four spring suspension ring I, and the other end is fixedlyed connected with four spring suspension ring II that are evenly distributed on the base plate upper surface.
The through hole at described base plate center is a ladder hole, scum rubber and loam cake are installed on the two-stage ladder successively, and loam cake is fixed on the base plate by socket head cap screw, and by loam cake scum rubber is pressed on the base plate, the external diameter that the part that scum rubber stretches out through hole forms space and probe is complementary.
The amount of tension of described extension spring when card extender is fitted in the base plate upper surface is 10mm～30mm.
When the head of described probe was fitted in the base plate upper surface at card extender, the distance of stretching out the base plate bottom was 5mm～30mm.
Remarkable result of the present utility model is: form between flexure sensor and loading plate by four extension springs and flexibly connect, overcome the slip of the loading plate that lateral impact power causes and the vibration influence to the flexure measurement result; Simultaneously, scum rubber is installed in bottom hole, forms the space that is complementary with the probe external diameter, can guarantee the vertical moving of probe, prevent the sidesway of probe; Adopt the Falling Weight Deflectometer of flexure sensor flexible hanging device, its flexure measuring accuracy can reach 0.25%.
Description of drawings
Fig. 1 is a flexure sensor flexible hanging device structural representation described in the utility model;
Among the figure: 1, flexure sensor; 2, extension spring; 3, loading plate; 4, scum rubber; 5, spring suspension ring I; 6, loam cake; 7, socket head cap screw; 8, base plate; 9, sunk screw; 10, sensor upper plate; 11, spring suspension ring II; 12, sensor main body; 13, card extender; 14, probe.
Embodiment
Below in conjunction with accompanying drawing the utility model is described in further detail.
As shown in Figure 1, flexible suspension flexure sensor comprises flexure sensor 1, extension spring 2 and loading plate 3, wherein, flexure sensor 1 comprises sensor main body 12, sensor upper plate 10, card extender 13 and probe 14, card extender 13 is a platy structure, and be threaded fixing with sensor main body 12 by the bolt arrangement at its center, probe 14 is fixed on center, card extender 13 lower end by being threaded, sensor upper plate 10 is fixed on sensor main body 12 upper ends by sunk screw 9, the spring suspension ring I 11 that distributes on 10 4 angles of four extension spring 2 one ends and sensor upper plates is connected, the other end is fixedlyed connected with four the spring suspension ring II5 of base plate 8 upper surfaces in being evenly distributed on loading plate 3, base plate 8 centers have ladder hole, scum rubber 4 and loam cake 6 are installed on the two-stage ladder successively, and loam cake 6 is fixed on the base plate 8 by socket head cap screw 7, loam cake 6 is pressed on scum rubber 4 on the base plate 8, probe 14 passes the through hole that stretches out of scum rubber 4, stretch into the ladder hole at base plate 8 centers, and guarantee that the space of formation between the scum rubber 4 and the external diameter of probe 14 are complementary, and prevent probe 14 sidesways; Flexure sensor flexible hanging device is raised built on stilts, and probe 14 stretches out loading plate 3 center ladder holes, exposes probe 14 heads, and probe 14 heads are 5～30mm, for example 5mm apart from the distance of loading plate 3 lower surfaces; 20mm; 30mm; The amount of tension of extension spring 2 is 10～30mm, for example 10mm; 15mm; 30mm; When using flexure sensor flexible hanging device that subgrade and pavement is carried out the flexure measurement, flexure sensor flexible hanging device is dropped on the ground, probe 14 is with flexure sensor 1 jack-up, probe 14 and loading plate 3 lower surfaces while kiss the earth, at this moment, only contact between flexure sensor 1 and the loading plate 3 by four extension springs 2 of hanging, therefore, the slip of loading plate 3 and vibration are by extension spring 2 decay during measurement, can't pass to flexure sensor 1, thereby isolate its influence, improved the flexure measuring accuracy measurement result; After finishing measurement, flexure sensor flexible hanging device is carried hoisting gear mentions built on stilts, card extender 13 lower surfaces in the flexure sensor 1 and the base plate in the loading plate 38 are fitted, and make the amount of tension of extension spring 2 and overhang that probe 14 stretches out loading plate 3 lower surfaces return to initial position, so that measure next time.
Claims (4)
1. flexible suspension flexure sensor, comprise flexure sensor (1) and loading plate (3), wherein, flexure sensor (1) comprises sensor main body (12), sensor upper plate (10), card extender (13) and probe (14), probe (14) is fixed on the lower end of sensor main body (12) by card extender (13), and sensor upper plate (10) is fixed on the upper end of sensor main body (12) by sunk screw (9); Base plate (8) center in the loading plate (3) has through hole, can make probe (14) pass base plate (8) central through hole, it is characterized in that: on four angles of sensor upper plate (10), be distributed with four spring suspension ring I (11), four extension spring (2) one ends are connected with four spring suspension ring I (11), and the other end is fixedlyed connected with four the spring suspension ring II (5) that are evenly distributed on base plate (8) upper surface.
2. flexible suspension flexure sensor according to claim 1, it is characterized in that: the through hole at described base plate (8) center is a ladder hole, scum rubber (4) and loam cake (6) are installed on the two-stage ladder successively, and loam cake is fixed on the base plate (8) by socket head cap screw (7), and by loam cake (6) scum rubber (4) is pressed on the base plate (8), the external diameter that the part that scum rubber (4) stretches out through hole forms space and probe (14) is complementary.
3. flexible suspension flexure sensor according to claim 1 is characterized in that: the amount of tension of described extension spring (2) when card extender (13) is fitted in base plate (8) upper surface is 10mm～30mm.
4. flexible suspension flexure sensor according to claim 1 is characterized in that: when the head of described probe (14) was fitted in base plate (8) upper surface at card extender (13), the distance of stretching out base plate (8) bottom was 5mm～30mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201020605758 CN201885922U (en) | 2010-11-15 | 2010-11-15 | Flexible suspension deflection sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201020605758 CN201885922U (en) | 2010-11-15 | 2010-11-15 | Flexible suspension deflection sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201885922U true CN201885922U (en) | 2011-06-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201020605758 Expired - Lifetime CN201885922U (en) | 2010-11-15 | 2010-11-15 | Flexible suspension deflection sensor |
Country Status (1)
| Country | Link |
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| CN (1) | CN201885922U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103032631A (en) * | 2012-12-20 | 2013-04-10 | 中国电力科学研究院 | Iced conductor supporting device |
| CN103698495A (en) * | 2012-09-28 | 2014-04-02 | 北京航天计量测试技术研究所 | Load transmission capacity measurement device for concrete pavement joint |
| CN103954296B (en) * | 2013-09-05 | 2017-03-15 | 北京今谷神箭测控技术研究所 | A kind of FWD laser calibrating equipment |
| CN109632534A (en) * | 2018-12-19 | 2019-04-16 | 安徽省骏腾工程试验检测有限公司 | A kind of electronic hammer-falling deflectometer of trailer-type |
-
2010
- 2010-11-15 CN CN 201020605758 patent/CN201885922U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103698495A (en) * | 2012-09-28 | 2014-04-02 | 北京航天计量测试技术研究所 | Load transmission capacity measurement device for concrete pavement joint |
| CN103032631A (en) * | 2012-12-20 | 2013-04-10 | 中国电力科学研究院 | Iced conductor supporting device |
| CN103954296B (en) * | 2013-09-05 | 2017-03-15 | 北京今谷神箭测控技术研究所 | A kind of FWD laser calibrating equipment |
| CN109632534A (en) * | 2018-12-19 | 2019-04-16 | 安徽省骏腾工程试验检测有限公司 | A kind of electronic hammer-falling deflectometer of trailer-type |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110629 |