WO2010053392A1 - Transducteur pour la mesure de déplacements verticaux - Google Patents

Transducteur pour la mesure de déplacements verticaux Download PDF

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Publication number
WO2010053392A1
WO2010053392A1 PCT/PT2009/000058 PT2009000058W WO2010053392A1 WO 2010053392 A1 WO2010053392 A1 WO 2010053392A1 PT 2009000058 W PT2009000058 W PT 2009000058W WO 2010053392 A1 WO2010053392 A1 WO 2010053392A1
Authority
WO
WIPO (PCT)
Prior art keywords
transducer
load cell
liquid
measuring
vertical displacements
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/PT2009/000058
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English (en)
Portuguese (pt)
Other versions
WO2010053392A4 (fr
Inventor
Joaquim De Azevedo Figueiras
Carlos Manuel DA SILVA FÉLIX
Carlos Filipe Guedes Rodrigues
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Instituto Politecnico Do Porto
Universidade do Porto
Original Assignee
Instituto Politecnico Do Porto
Universidade do Porto
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Instituto Politecnico Do Porto, Universidade do Porto filed Critical Instituto Politecnico Do Porto
Publication of WO2010053392A1 publication Critical patent/WO2010053392A1/fr
Publication of WO2010053392A4 publication Critical patent/WO2010053392A4/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
    • G01C5/00—Measuring height; Measuring distances transverse to line of sight; Levelling between separated points; Surveyors' levels
    • G01C5/04—Hydrostatic levelling, i.e. by flexibly interconnected liquid containers at separated points

Definitions

  • the measurement of relative vertical displacements in civil engineering structures - arrows is one of the most representative quantities of the behavior of this structure and a reference quantity in the evaluation of its safety and integrity.
  • the measurement of these arrows is generally hampered, in the specific case of bridges, by the impossibility of establishing physical references, particularly in the ground, to allow their autonomous and permanent measurement.
  • Different techniques of arrow measurement have been tried and adopted in real structures allowing, depending on the structure typology and the terrain morphology, different levels of autonomy and precision.
  • Patent Number JP56162009 May 19, 1980
  • the object of this patent is for the measurement of liquid levels associated with measurement of arrows in civil engineering works on transient or permanent structural monitoring systems.
  • the transducer uses a hydrostatic leveling that runs through the structure under observation and a fixed reference position, enabling the relative vertical position of the various instrumented points to be determined over time by measuring the height. of the column of liquid at each of these same points.
  • 0 liquid level sensor shown here is designed and framed in the foregoing context, it takes advantage of a principle more than 2000 years, widely 'known Archimedes principle, and translates, as a result of its internal architecture, directly, perfectly linear and highly sensitive, the variation of a hydrostatic level (namely of water or possibly of a comparable fluid) in the signal of extensometric sensors (of any nature).
  • Figure 1 Transducer for measuring vertical displacements: measuring mechanism and general internal constitution - Section A-A;
  • Figure 2 - Transducer for measuring vertical displacements measuring mechanism and general internal constitution - Section B-B;
  • Figure 12 Lower element for immersible body suspension: front view
  • Figure 13 Lower element for immersible body suspension: side view
  • Figure 14 Upper element for immersible body suspension: front view
  • Figure 15 Upper element for immersible body suspension: side view
  • Figure 17 Schematic principle of the method of measuring arrows using liquid levels
  • Figure 18 Diagram of forces on the body partially immersed in a liquid
  • Figure 19 - Load cell single-line, deformed diagram, bending moment diagram and axial stress diagram.
  • a at time t1 is the liquid height at point A at the initial time (t); 3 ⁇ 4 'the height of liquid in the (fixed) reference section at time t ⁇ ; and "0 o and the liquid height in the (fixed) reference section at the initial time (t 0 ).
  • the target vertical displacement transducer of this invention developed for the purpose of measuring arrows in civil engineering works, thus bases its operation on measuring the height of the liquid column at a given point in a hydraulic circuit. .
  • the structure of the present relative vertical displacement transducer is shown in Figure 1 and Figure 2.
  • the basic principle for obtaining the height of liquid is to measure the apparent weight of a body of previously studied geometry and properties (6), partially immersed in a liquid and whose immersed volume is associated with its relative liquid height (position (2)).
  • the Archimedes Principle is used to deduce that, being a solid body, partially immersed in a fluid, by the action of an upward pushing force of hydrostatic origin (see Figure 18), the value of its weight, within that liquid is apparently less than its weight measured in air (resulting from the forces? and 1 ⁇ .
  • the difference between the value of the actual weight (P) measured in air and the impulse exerted by the liquid (') corresponds to apparent body weight (3 ⁇ 4?) ⁇
  • Vi is the immersed volume of the cylindrical or prismatic body; A is the base area of the body; * is the immersed height of the body; m is the mass of the body; ⁇ is the acceleration of gravity and P is the density of the liquid in which the body is immersed.
  • the present transducer consists of a watertight container (1) connected to the respective hydraulic circuit (3) by means of a tubular nozzle (9) near the base (8).
  • This container (1) comprises inside it the free surface of the liquid column (2) as well as suspended through its upper cover (18) the partially immersed rigid cylindrical body (6) and a load cell (4) which It will be possible to measure, over time, through a pair of extensometric sensors (5) the respective apparent weight of the different body (6).
  • 3 ⁇ 4 correspond to the forces installed on the part, namely axial stress and bending moment, respectively; 3 ⁇ 4 is the apparent weight of the body suspended in the load cell (acting external force) and 'the respective arm of the load cell.
  • a pair of strain gauges arranged in opposite fibers of the thinner central vertical zone (see Figure 9) subjected to composite circular flexion, form the basis of this sensor and lead to an element which, in addition to its high sensitivity, has high temporal and meteorological stability. , making it particularly suitable for permanent structural monitoring applications.
  • the mechanical strain, « is numerically given by the sum of the axial strain portion, * m, and the bending strain portion, * m, given
  • R is the modulus of elasticity of the material
  • A is the cross-sectional area
  • ' is the moment of inertia of the cross section the local coordinate of the part perpendicular to its axis.
  • the total strain, 1 ⁇ 2, measured by a strain gauge is given, as shown above, by the sum of the said portions and corresponds to:
  • this load cell besides having a geometry and dimensions adjusted to its function and the desired sensitivity and field of measurement (7), presents perfectly defined boundary conditions (12/13 and 14/15) that allow a clear and stable characterization of the internal stresses installed.
  • boundary conditions (12/13 and 14/15) that allow a clear and stable characterization of the internal stresses installed.
  • a cylindrical or prismatic outer container (1) connected to the reference hydraulic circuit (3) by a mouth (9) of similar diameter to the circuit itself, internally contains its fluid in imminent hydrostatic equilibrium. Access to the interior of this outer container (1) is by means of a removable lid (18) rigidly secured to the main body using a sequence of securing screws (20). Under service conditions, it is within the container (1) that the free surface of the liquid column (2) of the respective hydraulic system is within a pre-defined measuring range (7). Stainless steel also ensures the attachment of all internal mechanical components by means of a central fastener (17) located on the top cover (18).
  • a partially immersed body (6) i.e. the suspended mass subjected to an eminently variable thrust and whose apparent weight is to be measured, is coupled to a load cell (4) and suspended from the lid.
  • This element (6) consists of a cylindrical surface, closed at the tops and as a whole slightly denser than the liquid.
  • the driving force acting on this element is directly proportional to the height of liquid installed inside the container. Its dimensions are defined so that, on the one hand, it covers the desired field of measurement (7) - height, and on the other hand, it ensures that the pushing force, proportional to the planar area of this element, is consistent with the sensitivity. intended. It is a target element that can be adapted to either the field of measurement or the sensitivity of the sensor. A conical shape in the base further ensures the elimination of unwanted air bubbles in contact with the surface of this body.
  • the load cell (4) takes advantage of a studied geometry in order to allow a high sensitivity and stability in measuring the apparent weight of the suspended body.
  • This element has a "U" geometry, with the points of application of the forces (12/13 and 14/15) at their ends and subjected in the central region to compound circular bending forces.
  • it is a high rigidity element, thus contributing to a negligible deviation resulting from the consideration of the suspended body as integrally with the structure over the entire measuring range of the sensor.
  • strain gauges (5) installed on opposite sides of the thinner central load cell (4) subjected to compound circular flexion, in turn, isolates the flexing effect, leading to the total elimination of deformation due to axial stress installed on the part and the effects associated with temperature variation.
  • it is a versatile transducer in the nature and technology of its signal, which, depending on the nature of the installed strain gauges (5), may be associated with both electric-based and optical-based monitoring systems. .
  • the connections between the load cell (4) and the suspended body (6) and between the load cell (4) and the transducer cover (18) are punctually connected via a conical system. (12/13 and 14/15) on both the load cell (4) and its supports (17 and 10). This detail contributes to a repeatable and stable positioning of the load application points in the load cell.
  • a pair of transverse dowels (11 and 16) further guarantee the integrity of the system against sudden movements, for example resulting from system installation.
  • connection to the hydraulic circuit (3) has adequate architecture and characteristics which, in hydrostatic equilibrium, allows the leveling of all points of the lower mouth (9) by means of commercial stainless steel hydraulic pipe fittings.
  • a fastening system to the rigid base (8) of the transducer by means of a three-point screw arrangement (22) shall ensure rigid attachment of the transducer to the frame and allow for vertical adjustment of the sensor body.
  • the verticality of the transducer will ensure no physical contact between the moving elements of the transducer, ensuring no friction and resulting deviations.
  • An air inlet valve (21) at the top of the transducer allows, when open, the air pressure inside the transducer to be identical to the local atmospheric pressure.
  • Two mechanical connectors (19) allow the connection of this transducer to a sensor network and its acquisition equipment.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Length Measuring Devices By Optical Means (AREA)
  • Testing Or Calibration Of Command Recording Devices (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
  • Length Measuring Devices With Unspecified Measuring Means (AREA)

Abstract

La présente invention concerne un transducteur pour la mesure de déplacements verticaux dans des structures de génie civil, telles que ponts et viaducs. A cet effet, ce transducteur fait intervenir un nivellement hydrostatique sur toute la structure en observation, ainsi qu'une position de référence fixe permettant la détermination, au fil du temps, du déplacement vertical relatif des divers points instrumentés. Basé sur le principe d'Archimède, ce transducteur est constitué par un contenant extérieur (1) qui, du fait qu'il contient un liquide en quasi-équilibre hydrostatique (2) avec le circuit hydraulique (3) additionnel, est représentatif de la position altimétrique du corps par rapport au circuit restant. Par l'intermédiaire d'une cellule de charge (4) munie de capteurs extensométriques (5), on effectue le couplage d'une masse partiellement immergée (6) qui permet, par cette voie, la transduction de la hauteur de liquide en une force (poids apparent du corps (6)) pouvant être mesurée par la cellule de charge (4) dans le signal des capteurs extensométriques.
PCT/PT2009/000058 2008-11-05 2009-11-05 Transducteur pour la mesure de déplacements verticaux Ceased WO2010053392A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
PTPT104250 2008-11-05
PT10425008A PT104250B (pt) 2008-11-05 2008-11-05 Transdutor para medição de deslocamentos verticais

Publications (2)

Publication Number Publication Date
WO2010053392A1 true WO2010053392A1 (fr) 2010-05-14
WO2010053392A4 WO2010053392A4 (fr) 2010-08-19

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PCT/PT2009/000058 Ceased WO2010053392A1 (fr) 2008-11-05 2009-11-05 Transducteur pour la mesure de déplacements verticaux

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PT (1) PT104250B (fr)
WO (1) WO2010053392A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013047338A (ja) * 2011-07-28 2013-03-07 Toyo Quality One Corp 吸音衝撃吸収材及びその製造方法
CN104132642A (zh) * 2014-06-23 2014-11-05 四川金码科技有限公司 可消除温度漂移的高精度静力水准仪
CN106908035A (zh) * 2017-04-10 2017-06-30 郑州市质量技术监督检验测试中心 一种电感式智能静力水准仪装置
CN109029349A (zh) * 2018-07-27 2018-12-18 厦门大学嘉庚学院 基于gps定位的沉降监测装置及监测方法

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3949484A (en) * 1974-05-22 1976-04-13 The English Electric Company Limited Vertical movement detection systems
JPS56162009A (en) 1980-05-19 1981-12-12 Mitsubishi Heavy Ind Ltd Displacement measuring device
US4384410A (en) * 1981-07-27 1983-05-24 Drm Industries, Inc. Precision hydrostatic levelling system
US4581931A (en) * 1981-01-29 1986-04-15 Cise-Centro Informazioni Studi Esperienze S.P.A. Differential level-monitoring float device
CH658909A5 (en) * 1983-05-31 1986-12-15 Ehsan Salim Device using electrical resistance extensometers which can be employed as a measuring cell, force transducer, load cell and for other applications
JPS62299717A (ja) * 1986-06-20 1987-12-26 Touyoko Erumesu:Kk 沈下計
JPS63120213A (ja) 1986-11-07 1988-05-24 Ishikawajima Kensa Keisoku Kk 大型構造物等のレベル計測方法
EP0604670A1 (fr) 1992-12-19 1994-07-06 HELIOS AG Niveaumessung und Wägetechnik Dispositif pour la mesure des niveaux d'un fluide dans un réservoir
US5693881A (en) * 1994-12-15 1997-12-02 Sitachitt; Sidney Sensor-based liquid leveling system for structures
JPH10227633A (ja) 1997-02-13 1998-08-25 Ishikawajima Inspection & Instrumentation Co 橋梁の形状計測装置
DE10203231C1 (de) * 2002-01-21 2003-09-11 Bam Bundesanstalt Matforschung Schlauchwaage

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3949484A (en) * 1974-05-22 1976-04-13 The English Electric Company Limited Vertical movement detection systems
JPS56162009A (en) 1980-05-19 1981-12-12 Mitsubishi Heavy Ind Ltd Displacement measuring device
US4581931A (en) * 1981-01-29 1986-04-15 Cise-Centro Informazioni Studi Esperienze S.P.A. Differential level-monitoring float device
US4384410A (en) * 1981-07-27 1983-05-24 Drm Industries, Inc. Precision hydrostatic levelling system
CH658909A5 (en) * 1983-05-31 1986-12-15 Ehsan Salim Device using electrical resistance extensometers which can be employed as a measuring cell, force transducer, load cell and for other applications
JPS62299717A (ja) * 1986-06-20 1987-12-26 Touyoko Erumesu:Kk 沈下計
JPS63120213A (ja) 1986-11-07 1988-05-24 Ishikawajima Kensa Keisoku Kk 大型構造物等のレベル計測方法
US4894924A (en) * 1986-11-07 1990-01-23 Ishikawajima Kensa Keisoku Kabushiki Kaisha Method for measuring level of large structure
EP0604670A1 (fr) 1992-12-19 1994-07-06 HELIOS AG Niveaumessung und Wägetechnik Dispositif pour la mesure des niveaux d'un fluide dans un réservoir
US5693881A (en) * 1994-12-15 1997-12-02 Sitachitt; Sidney Sensor-based liquid leveling system for structures
JPH10227633A (ja) 1997-02-13 1998-08-25 Ishikawajima Inspection & Instrumentation Co 橋梁の形状計測装置
DE10203231C1 (de) * 2002-01-21 2003-09-11 Bam Bundesanstalt Matforschung Schlauchwaage

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013047338A (ja) * 2011-07-28 2013-03-07 Toyo Quality One Corp 吸音衝撃吸収材及びその製造方法
CN104132642A (zh) * 2014-06-23 2014-11-05 四川金码科技有限公司 可消除温度漂移的高精度静力水准仪
CN104132642B (zh) * 2014-06-23 2016-08-24 四川金码科技有限公司 可消除温度漂移的高精度静力水准仪
CN106908035A (zh) * 2017-04-10 2017-06-30 郑州市质量技术监督检验测试中心 一种电感式智能静力水准仪装置
CN109029349A (zh) * 2018-07-27 2018-12-18 厦门大学嘉庚学院 基于gps定位的沉降监测装置及监测方法

Also Published As

Publication number Publication date
WO2010053392A4 (fr) 2010-08-19
PT104250A (pt) 2010-05-05
PT104250B (pt) 2010-10-28

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