CN204594624U - Embedded soil pressure cell simple calibrating device in a kind of sandy soil medium - Google Patents
Embedded soil pressure cell simple calibrating device in a kind of sandy soil medium Download PDFInfo
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- CN204594624U CN204594624U CN201520317266.9U CN201520317266U CN204594624U CN 204594624 U CN204594624 U CN 204594624U CN 201520317266 U CN201520317266 U CN 201520317266U CN 204594624 U CN204594624 U CN 204594624U
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- soil pressure
- pressure cell
- load plate
- reaction frame
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- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The utility model discloses embedded soil pressure cell simple calibrating device in a kind of sandy soil medium, belong to Geotechnical Engineering soil pressure device association area.This device comprises reaction frame base plate, reaction frame top board, screw mandrel, embedded soil pressure cell burying system, cylinder, hard and soft combination load plate, lower rigid disc, ring of measuring one's own ability, upper rigid disc and screw jack.With screw mandrel, reaction frame base plate is fixedly connected with reaction frame top board; Embedded soil pressure cell burying system comprise miniature soil pressure cell, overcoat annulus, on cover rigid sheet and base; The inner side uniform application vaseline of cylinder, and paste plastic sheeting; Hard and soft combination load plate comprises rigidity load plate, middle flexible load plate and lower rigidity load plate; Screw jack is fixed on reaction frame top board lower surface, controls load application by jacking hand lever.The utility model device structure is comparatively simple, and handled easily, solves the embedded soil pressure cell problem of calibrating of different size in sandy soil medium.
Description
Technical field
The utility model relates to a kind of sensor calibration apparatus, particularly relates to embedded soil pressure cell simple calibrating device in sandy soil medium, can be used for the demarcation of the soil pressure cell measuring soil pressure force value in sandy soil medium in indoor model test.
Background technology
The Earth pressures acted on retaining wall is everybody question of common concern always, because this has been a large amount of indoor model test to study size and the distribution of soil pressure, often can relate to the problem of calibrating of soil pressure cell in sandy soil medium under study for action.Soil pressure cell dispatches from the factory and often adopts liquid mark or gas mark, but because the existence of soil arching effect and the distortion of stress surface in sandy soil medium, the shear stress etc. in soil pressure cell face can reduce power suffered on box face, the thickness of sand, density and rigidity all can have a certain impact to the measuring value of soil pressure cell in addition, therefore the rating test of sand of the same race and density of the same race under being necessary to carry out test condition in sandy soil medium.In sand mark test in the past, or employing load plate adds counterweight, add air pressure or pass through the loading of control centrifugal acceleration, the method adding counterweight then cannot demarcate the soil pressure cell of relatively large journey, adds air pressure or realizes the method for loading then due to the limited more difficult realization of test condition by hydro-extractor.Therefore utilizing comparatively easy method to demarcate soil pressure cell is problem in the urgent need to address.
Large quantity research shows that the embedding manner of soil pressure cell has larger impact to soil pressure cell measuring value, for general soil pressure cell, normal employing lower berth one deck sand again on cover the mode (making soil pressure cell in the middle of sand) of one deck sand, but for embedded soil pressure cell, the back side of soil pressure cell should be rigidity, one deck sand in lower berth cannot ensure absolute rigidity, and need soil pressure cell surface will flush with measurement soil pressure face for embedded soil pressure cell, in addition for adapting to the soil pressure cell of different size, need to arrange specific base of burying underground to meet these demands.
Summary of the invention
In order to overcome above-mentioned the deficiencies in the prior art, the utility model provides embedded soil pressure cell simple calibrating device in sandy soil medium, the soil pressure cell solving relatively large range in comparatively simple determination sandy soil medium is demarcated, and the embedded soil pressure cell of different size bury problem underground.
The utility model solves the technical scheme that its technical matters adopts: embedded soil pressure cell simple calibrating device in a kind of sandy soil medium, comprises the reaction frame base plate that is parallel to each other and reaction frame top board, screw mandrel, embedded soil pressure cell burying system, cylinder, hard and soft combination load plate, lower rigid disc, ring of measuring one's own ability, upper rigid disc and screw jack; Four angles place of described reaction frame top board has through hole, and the corresponding position of reaction frame base plate has screw, and four vertical screw mandrels are each passed through through hole and screw, are fixedly connected with by reaction frame base plate by fastening nut with reaction frame top board; Described embedded soil pressure cell burying system by miniature soil pressure cell, overcoat annulus, on cover rigid sheet and base forms, described miniature soil pressure cell is placed in overcoat annulus, and the sidewall of overcoat annulus has soil pressure cell Signal transmissions hole; Described base is cylindrical structure, and upper surface has fixing round cylinder slot, and centre is left overcoat annulus and buried hole underground, and sidewall has soil pressure cell Signal transmissions wire casing; The signal transmssion line of described miniature soil pressure cell is successively through soil pressure cell Signal transmissions hole, soil pressure cell Signal transmissions wire casing; Have two soil pressure cells in the bottom that overcoat annulus buries hole underground and reserve aperture; Cover in the upper end of soil pressure cell Signal transmissions wire casing on one and cover rigid sheet; The inner surface uniform application vaseline of described cylinder, pastes layer of plastic film on vaseline surface; Cylinder is buckled in the fixing round cylinder slot of base; Described hard and soft combination load plate comprises the upper rigidity load plate of fitting successively from top to bottom, middle flexible load plate and lower rigidity load plate, described upper rigidity load plate, middle flexible load plate and lower rigidity load plate are disc-shaped structure, diameter is consistent, and is slightly less than the internal diameter of cylinder; Described lower rigid disc is placed in rigidity load plate upper surface center, described in ring of measuring one's own ability be placed in lower rigid disc upper surface; Described ring of measuring one's own ability adopts pressure type to measure one's own ability ring, and the ring body of ring of measuring one's own ability adopts spring steel to make, and dial gauge is fixed on measures one's own ability on ring lever; The jack base of described screw jack is fixed on reaction frame top board lower surface by base holding screw; The side of screw jack is provided with jacking hand lever, and top is provided with elevating lever; The bottom of elevating lever is screwed rigid disc.
Further, described reaction frame base plate and reaction frame top board adopt steel plate to make; Screw mandrel adopts steel screw mandrel to make; Cylinder is steel cylinder; Base is not for fix steel base.
Further, it is smaller that the external diameter of described overcoat annulus buries hole diameter underground than overcoat annulus, and the internal diameter of described overcoat annulus is more bigger than miniature soil pressure cell diameter.
Further, described lower rigidity load plate and upper rigidity load plate adopt the thick steel plate of 1-2cm to make, middle flexible load plate adopts the thick hard gel material of 1-2cm to make, and middle flexible load plate thickness comparatively descends the thickness of rigidity load plate and upper rigidity load plate bigger.
Compared with prior art, the beneficial effects of the utility model are:
1, the loading system adopted in the utility model adopts screw jack, be convenient to apply relatively large load and comparatively convenient, select screw jack and adopt screw to be fixed on reaction frame top board, be the consideration based on following aspect: Normal hydraulic lifting jack can only apply upwards or the power of level, hydraulic jack be inverted and then cannot apply downward power; Need time hydraulic jack withstands on applying power to apply power at vertical direction to jack handle, therefore this part power also can going down, and the power that screw jack applies is the power of hoop in vertical plane, can not going down.
2, for the sand mark of embedded soil pressure cell, the soil pressure cell embedding manner adopted in the utility model is: base reserves the embedded burial place of soil pressure cell and soil pressure cell Signal transmissions line position by boring and grooving, and outside soil pressure cell, extract an overcoat annulus, the overcoat annulus that overcoat annulus and miniature soil pressure cell are integrally embedded in base is buried underground in hole, separately arranges at soil pressure cell Signal transmissions wire casing and to cover tablet on one and ensure that base upper surface is smooth.
3, as improvement of the present utility model, for adapting to the size of different soil pressure cell, this device extracts outside soil pressure cell that external diameter is identical, the overcoat annulus of internal diameter and soil pressure cell consistent size, is then embedded in reserved circular hole.
Accompanying drawing explanation
Fig. 1 is embedded soil pressure cell simple calibrating device in indoor sandy soil medium;
Fig. 2 is embedded soil pressure cell burying system wiring layout;
Fig. 3 is embedded soil pressure cell burying system structural representation;
In figure: reaction frame base plate 1; Screw mandrel 2; Reaction frame top board 3; Base 4; Overcoat annulus buries hole 4-1 underground; Soil pressure cell Signal transmissions wire casing 4-2; Soil pressure cell reserves aperture 4-3; Fix round cylinder slot 4-4; Miniature soil pressure cell 5; Signal transmssion line 5-1; Cylinder 6; Plastic sheeting 7; Test sand 8; Lower rigidity load plate 9; Middle flexible load plate 10; Upper rigidity load plate 11; Lower rigid disc 12; To measure one's own ability ring 13; Measure one's own ability ring lever 13-1; Dial gauge 14; Upper rigid disc 15; Screw jack 16; Jacking hand lever 16-1; Elevating lever 16-2; Jack base 17; Base holding screw 17-1; Overcoat annulus 18; Soil pressure cell Signal transmissions hole 18-1; On cover rigid sheet 19.
Embodiment
Below in conjunction with drawings and Examples, the utility model is described in further detail.
As shown in Figure 1, embedded soil pressure cell simple calibrating device in a kind of sandy soil medium of the utility model, comprises the reaction frame base plate 1 that is parallel to each other and reaction frame top board 3, screw mandrel 2, embedded soil pressure cell burying system, cylinder 6, hard and soft combination load plate, lower rigid disc 12, ring 13 of measuring one's own ability, upper rigid disc 15, screw jack 16.
Four angles place of described reaction frame top board 3 has through hole, and the corresponding position of reaction frame base plate 1 has screw, and four vertical screw mandrels 2 are each passed through through hole and screw, are fixedly connected with by reaction frame base plate 1 by fastening nut with reaction frame top board 3; Reaction frame base plate 1 and reaction frame top board 3 adopt 2-3cm steel plate to make, the strength and stiffness needed for warranty test; Threaded screw mandrel 2 adopts the good steel screw mandrel of the tensile property of high strength to make, and its length should leave more than needed, is convenient to the spacing regulating reaction frame base plate 1 and reaction frame top board 3.
As shown in Figure 2,3, described embedded soil pressure cell burying system, by miniature soil pressure cell 5, overcoat annulus 18, on cover rigid sheet 19 and base 4 forms, described miniature soil pressure cell 5 is placed in overcoat annulus 18, and the sidewall of overcoat annulus 18 has soil pressure cell Signal transmissions hole 18-1; Described base 4 is cylindrical structure, and upper surface has the thick fixing round cylinder slot 4-4 of 0.5cm, and centre is left overcoat annulus and buried hole 4-1 underground, and sidewall has soil pressure cell Signal transmissions wire casing 4-2; The signal transmssion line 5-1 of described miniature soil pressure cell 5 is successively through soil pressure cell Signal transmissions hole 18-1, soil pressure cell Signal transmissions wire casing 4-2; Have two soil pressure cells in the bottom that overcoat annulus buries hole 4-1 underground and reserve aperture 4-3, be convenient to the dismounting of miniature soil pressure cell 5 and overcoat annulus 18; Cover in the upper end of soil pressure cell Signal transmissions wire casing 4-2 on one and cover rigid sheet 19, make base 4 upper surface smooth.For adapting to the size of different soil pressure cell, miniature soil pressure cell 5 and overcoat annulus 18 being integrally embedded in overcoat annulus and burying underground in hole 4-1, the soil pressure cell according to different size demarcates needs, can make different overcoat annulus 18 and demarcate; Wherein ensure that the external diameter of overcoat annulus 18 buries hole 4-1 diameter underground than overcoat annulus smaller, make it can not affect burying underground of overcoat annulus 18 and dismantle; Ensure that the internal diameter of overcoat annulus 18 is more bigger than miniature soil pressure cell 5 diameter, ensure to stay in the middle of it seam unlikely excessive and affect surfacing even the entering of sand, simultaneously can not the burying underground and dismantling of the miniature soil pressure cell 5 of too small impact.
Described cylinder 6 adopts the thick steel pipe of 1cm to make, inner side polishing, and at the thick vaseline of inner surface uniform application 2-5mm, layer of plastic film 7 is pasted on vaseline surface, can the friction resistance of sidewall be dropped to minimum again while preventing the contact of sand and vaseline, thus make the load on top be fully transmitted to base 4 by the soil body; The cylinder 6 of inner wall smooth process is buckled in the fixing round cylinder slot 4-4 of base 4, separately need ensures cylinder 6 external diameter and fix round cylinder slot 4-4 internal diameter and adapt, in order to avoid the movement of cylinder 6 in test.
Described hard and soft combination load plate comprises the upper rigidity load plate 11 of fitting successively from top to bottom, middle flexible load plate 10 and lower rigidity load plate 9, described upper rigidity load plate 11, middle flexible load plate 10 and lower rigidity load plate 9 are disc-shaped structure, diameter is consistent, and be slightly less than the internal diameter of cylinder 6, but can not be too small, otherwise the pressure being delivered to miniature soil pressure cell 5 surface be made not to be the pressure set by causing load action area to reduce.The high-strength steel sheet that described lower rigidity load plate 9 and upper rigidity load plate 11 adopt 1-2cm thick is made, the high resiliency hard gel material that middle flexible load plate 10 adopts 1-2cm thick is made, middle flexible load plate 10 thickness should comparatively descend the thickness of rigidity load plate 9 and upper rigidity load plate 11 bigger, separately require the surfacing of three layers of load plate and have good close fitting, and level is placed in the test sand surface in cylinder 6, ensures that the load that top applies can evenly be delivered to sand surface.The magnet arrangement (the utility model adopts the Magnetic gauge stand of dial gauge) that utilization can control magnetic holds lower rigidity load plate 9 and upper rigidity load plate 11, be placed in sand or flexible load plate 10 surface respectively and ensure its level, closing the magnetic of magnet arrangement and then slowly take off magnet arrangement.
Described lower rigid disc 12 is placed in rigidity load plate 11 upper surface center, described in ring 13 of measuring one's own ability be placed in lower rigid disc 12 upper surface; Described ring 13 of measuring one's own ability adopts pressure type to measure one's own ability ring, measure one's own ability ring 13 ring body adopt spring steel make, force value is amplified by the ring lever 13-1 that measures one's own ability, dial gauge 14 is fixed on measures one's own ability on ring lever 13-1, to measure one's own ability the distortion of ring 13, utilize ring calibration curve of measuring one's own ability that dial gauge 14 reading is converted to applied load.
The jack base 17 of described screw jack 16 is fixed on reaction frame top board 3 lower surface by base holding screw 17-1; The side of screw jack 16 is provided with jacking hand lever 16-1, and top is provided with elevating lever 16-2, controls the lifting of elevating lever 16-2 and then control the power of screw jack 16 output by the power acting on hoop in the vertical plane on jacking hand lever 16-1; The bottom of elevating lever 16-2 is screwed rigid disc 15, ensures that the power of screw jack 16 is applied to equably and measures one's own ability on ring 13.
The course of work of the present utility model is as follows: first reaction frame base plate 1, screw mandrel 2 and reaction frame top board 3 are assembled into reaction frame system, and fixes screw jack 16 and upper rigid disc 12; Miniature soil pressure cell 5 is embedded in overcoat annulus 18, it can be used as entirety to be embedded in base 4, signal transmssion line 5-1 is drawn from the reserved line of rabbet joint, be connected on external data collecting instrument and power supply, cover above draw-in groove on one and cover rigid sheet 19; Smooth treatment is carried out to cylinder 6 inwall, is buckled in the fixing round cylinder slot 4-4 of base 4; Layering lays the thick test sand 8 of 10cm and evenly densification gradually, smooth sand surface; Cover upper and lower rigidity load plate 9, middle flexible load plate 10, upper rigidity load plate 11, lower rigid disc 12 successively and fix the ring 13 of measuring one's own ability of dial gauge 14; The jacking hand lever 16-1 circumferential force applying to act on screw jack 16 gradually acts on the pressure on miniature soil pressure cell 5 surface with increase, and observe the reading of dial gauge 14 until reach the ratings (range) of miniature soil pressure cell 5, the power of screw jack 16 is discharged until unload completely, in triplicate after stablizing 5 minutes; Carry out miniature soil pressure cell 5 and load demarcation, the jacking hand lever 16-1 circumferential force applying to act on screw jack 16 gradually acts on the pressure on miniature soil pressure cell 5 surface with increase, observe the reading of dial gauge 14, if reach certain grade of load (utilization measure one's own ability ring calibration curve dial gauge 14 reading is converted to applied load), applying is stopped to act on jacking hand lever 16-1 circumferential force, utilize external data collecting instrument to read the output data of miniature soil pressure cell 5 after stablizing 10s, multistage loadings is until reach the ratings (range) of the miniature soil pressure cell 5 of soil pressure cell; Carry out miniature soil pressure cell 5 Unloading Calibration, gradually release action at the jacking hand lever 16-1 circumferential force of screw jack 16 to reduce to act on the pressure on miniature soil pressure cell 5 surface, observe the reading of dial gauge 14, if reduce to certain grade of load, stop release action at jacking hand lever 16-1 circumferential force, utilize external data collecting instrument to read the output data of miniature soil pressure cell 5 after stablizing 10s, unloading is until unload completely step by step; That the output data of miniature soil pressure cell 5 under the different loads gathering gained are depicted miniature soil pressure cell 5 in sandy soil medium adds Unloading Calibration curve.
Claims (4)
1. embedded soil pressure cell simple calibrating device in a sandy soil medium, it is characterized in that, comprise the reaction frame base plate (1) that is parallel to each other and reaction frame top board (3), screw mandrel (2), embedded soil pressure cell burying system, cylinder (6), hard and soft combination load plate, lower rigid disc (12), ring of measuring one's own ability (13), upper rigid disc (15) and screw jack (16); Four angles place of described reaction frame top board (3) has through hole, the corresponding position of reaction frame base plate (1) has screw, four vertical screw mandrels (2) are each passed through through hole and screw, are fixedly connected with by reaction frame base plate (1) by fastening nut with reaction frame top board (3); Described embedded soil pressure cell burying system by miniature soil pressure cell (5), overcoat annulus (18), on cover rigid sheet (19) and base (4) forms, described miniature soil pressure cell (5) is placed in overcoat annulus (18), and the sidewall of overcoat annulus (18) has soil pressure cell Signal transmissions hole (18-1); Described base (4) is cylindrical structure, and upper surface has and fixes round cylinder slot (4-4), and centre is left overcoat annulus and buried hole (4-1) underground, and sidewall has soil pressure cell Signal transmissions wire casing (4-2); The signal transmssion line (5-1) of described miniature soil pressure cell (5) is successively through soil pressure cell Signal transmissions hole (18-1), soil pressure cell Signal transmissions wire casing (4-2); Have two soil pressure cells in the bottom that overcoat annulus buries hole (4-1) underground and reserve aperture (4-3); Cover in the upper end of soil pressure cell Signal transmissions wire casing (4-2) on one and cover rigid sheet (19); The inner surface uniform application vaseline of described cylinder (6), pastes layer of plastic film (7) on vaseline surface; Cylinder (6) is buckled in the fixing round cylinder slot (4-4) of base (4); Described hard and soft combination load plate comprise fit successively from top to bottom upper rigidity load plate (11), middle flexible load plate (10) and lower rigidity load plate (9), described upper rigidity load plate (11), middle flexible load plate (10) and lower rigidity load plate (9) are disc-shaped structure, diameter is consistent, and is slightly less than the internal diameter of cylinder (6); Described lower rigid disc (12) is placed in rigidity load plate (11) upper surface center, described in ring (13) of measuring one's own ability be placed in lower rigid disc (12) upper surface; Described ring of measuring one's own ability (13) adopts pressure type to measure one's own ability ring, and the ring body of ring of measuring one's own ability (13) adopts spring steel to make, and dial gauge (14) is fixed on measures one's own ability on ring lever (13-1); The jack base (17) of described screw jack (16) is fixed on reaction frame top board (3) lower surface by base holding screw (17-1); The side of screw jack (16) is provided with jacking hand lever (16-1), and top is provided with elevating lever (16-2); The bottom of elevating lever (16-2) is screwed rigid disc (15).
2. embedded soil pressure cell simple calibrating device in a kind of sandy soil medium according to claim 1, is characterized in that, described reaction frame base plate (1) and reaction frame top board (3) adopt steel plate to make; Screw mandrel (2) adopts steel screw mandrel to make; Cylinder (6) is steel cylinder; Base (4) is not for fix steel base.
3. embedded soil pressure cell simple calibrating device in a kind of sandy soil medium according to claim 1, it is characterized in that, it is smaller that the external diameter of described overcoat annulus (18) buries hole (4-1) diameter underground than overcoat annulus, and the internal diameter of described overcoat annulus (18) is more bigger than miniature soil pressure cell (5) diameter.
4. embedded soil pressure cell simple calibrating device in a kind of sandy soil medium according to claim 1, it is characterized in that, described lower rigidity load plate (9) and upper rigidity load plate (11) adopt the thick steel plate of 1-2cm to make, middle flexible load plate (10) adopts the thick hard gel material of 1-2cm to make, and middle flexible load plate (10) thickness comparatively descends the thickness of rigidity load plate (9) and upper rigidity load plate (11) bigger.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520317266.9U CN204594624U (en) | 2015-05-14 | 2015-05-14 | Embedded soil pressure cell simple calibrating device in a kind of sandy soil medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520317266.9U CN204594624U (en) | 2015-05-14 | 2015-05-14 | Embedded soil pressure cell simple calibrating device in a kind of sandy soil medium |
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| Publication Number | Publication Date |
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| CN204594624U true CN204594624U (en) | 2015-08-26 |
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| CN201520317266.9U Withdrawn - After Issue CN204594624U (en) | 2015-05-14 | 2015-05-14 | Embedded soil pressure cell simple calibrating device in a kind of sandy soil medium |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104848988A (en) * | 2015-05-14 | 2015-08-19 | 浙江大学 | Simple calibration apparatus of embedded earth pressure box in sandy soil medium |
| CN105403359A (en) * | 2015-12-05 | 2016-03-16 | 浙江大学 | Simple calibrating device of mini-sized small measuring range pore water pressure sensor in aqueous medium |
| CN106370335A (en) * | 2016-10-21 | 2017-02-01 | 洛阳理工学院 | Pressure box fixing device for measuring surrounding rock-lining contact pressure of rock |
| CN110485481A (en) * | 2019-07-31 | 2019-11-22 | 青岛理工大学 | A kind of miniature steel pipe pile and cement slurry interfacial pressure on-site testing device and method |
| CN114526860A (en) * | 2022-02-23 | 2022-05-24 | 西南交通大学 | Calibration method of simply supported beam type soil pressure sensor |
-
2015
- 2015-05-14 CN CN201520317266.9U patent/CN204594624U/en not_active Withdrawn - After Issue
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104848988A (en) * | 2015-05-14 | 2015-08-19 | 浙江大学 | Simple calibration apparatus of embedded earth pressure box in sandy soil medium |
| CN104848988B (en) * | 2015-05-14 | 2017-05-24 | 浙江大学 | Simple calibration apparatus of embedded earth pressure box in sandy soil medium |
| CN105403359A (en) * | 2015-12-05 | 2016-03-16 | 浙江大学 | Simple calibrating device of mini-sized small measuring range pore water pressure sensor in aqueous medium |
| CN105403359B (en) * | 2015-12-05 | 2018-10-26 | 浙江大学 | Miniature small-range pore water pressure sensor simple calibrating device in aqueous medium |
| CN106370335A (en) * | 2016-10-21 | 2017-02-01 | 洛阳理工学院 | Pressure box fixing device for measuring surrounding rock-lining contact pressure of rock |
| CN106370335B (en) * | 2016-10-21 | 2022-06-28 | 洛阳理工学院 | Pressure box fixing device for measuring rock surrounding rock-lining contact pressure |
| CN110485481A (en) * | 2019-07-31 | 2019-11-22 | 青岛理工大学 | A kind of miniature steel pipe pile and cement slurry interfacial pressure on-site testing device and method |
| CN114526860A (en) * | 2022-02-23 | 2022-05-24 | 西南交通大学 | Calibration method of simply supported beam type soil pressure sensor |
| CN114526860B (en) * | 2022-02-23 | 2023-01-03 | 西南交通大学 | Calibration method of simply supported beam type soil pressure sensor |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20150826 Effective date of abandoning: 20170524 |
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| AV01 | Patent right actively abandoned |