FR2567550A1 - Preparation and placing of coaxial piezoelectric sensors in a roadway - Google Patents

Preparation and placing of coaxial piezoelectric sensors in a roadway Download PDF

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Publication number
FR2567550A1
FR2567550A1 FR8411613A FR8411613A FR2567550A1 FR 2567550 A1 FR2567550 A1 FR 2567550A1 FR 8411613 A FR8411613 A FR 8411613A FR 8411613 A FR8411613 A FR 8411613A FR 2567550 A1 FR2567550 A1 FR 2567550A1
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France
Prior art keywords
sensor
roadway
metal parts
placing
preparation
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.)
Withdrawn
Application number
FR8411613A
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French (fr)
Inventor
Claude Maeder
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Electronique Controle Mesure
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Electronique Controle Mesure
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Filing date
Publication date
Application filed by Electronique Controle Mesure filed Critical Electronique Controle Mesure
Priority to FR8411613A priority Critical patent/FR2567550A1/en
Publication of FR2567550A1 publication Critical patent/FR2567550A1/en
Withdrawn legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/01—Detecting movement of traffic to be counted or controlled
    • G08G1/02—Detecting movement of traffic to be counted or controlled using treadles built into the road
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01F—ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE
    • E01F11/00—Road engineering aspects of Embedding pads or other sensitive devices in paving or other road surfaces, e.g. traffic detectors, vehicle-operated pressure-sensitive actuators, devices for monitoring atmospheric or road conditions
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01G—WEIGHING
    • G01G19/00—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups
    • G01G19/02—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups for weighing wheeled or rolling bodies, e.g. vehicles
    • G01G19/025—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups for weighing wheeled or rolling bodies, e.g. vehicles wheel-load scales
    • G01G19/027—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups for weighing wheeled or rolling bodies, e.g. vehicles wheel-load scales using electrical weight-sensitive devices
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01G—WEIGHING
    • G01G19/00—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups
    • G01G19/02—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups for weighing wheeled or rolling bodies, e.g. vehicles
    • G01G19/03—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups for weighing wheeled or rolling bodies, e.g. vehicles for weighing during motion
    • G01G19/035—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups for weighing wheeled or rolling bodies, e.g. vehicles for weighing during motion using electrical weight-sensitive devices
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L1/00—Measuring force or stress, in general
    • G01L1/16—Measuring force or stress, in general using properties of piezoelectric devices

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Geophysics And Detection Of Objects (AREA)

Abstract

Piezoelectric sensor for the dynamic weighing and detection of vehicles on a roadway. The sensor is integral with a metal frame which is symmetric with respect to its axis and placed in a trench perpendicular to the traffic flow direction. The trench is filled with a material allowing as great a mechanical decoupling as possible between the sensor and the roadway.

Description

Différentes techniques de pose et de préparation de capteurs piézo-électriques coaxiaux sont connues mais toutes présentent le désavantage de faire dépendre la réponse du capteur de la qualité de la chaussée et en particulier de sa rigidité. Different techniques for fitting and preparing coaxial piezoelectric sensors are known, but all have the disadvantage of making the response of the sensor dependent on the quality of the roadway and in particular on its rigidity.

La présente invention a pour but de rendre la réponse du capteur la plus indépendante possible de la construction de la chaussée. The present invention aims to make the response of the sensor as independent as possible from the construction of the roadway.

Pour réaliser cette fonction de découplage du capteur, par rapport à la chaussée il convient de réaliser les fonctions essentielles suivantes
- que la réponse du capteur aux sollicitations des essieux soit la plus courte possible dans le temps afin de pouvoir réaliser des mesures sur des essieux multiples.To perform this decoupling function of the sensor, in relation to the road, the following essential functions should be performed
- that the response of the sensor to axle loads is as short as possible over time in order to be able to carry out measurements on multiple axles.

- que la déformation du capteur lors du passage d'un essieu soit grande par rapport à celle de la chaussée ; ainsi les réactions de cette dernière seront négligeables. - that the deformation of the sensor when passing an axle is large compared to that of the roadway; thus the reactions of the latter will be negligible.

- que l'action des roues soit directement ressentie par le capteur ou par un système rigide solidaire du capteur. - that the action of the wheels is directly felt by the sensor or by a rigid system integral with the sensor.

- que la réponse du capteur soit exempte de rebonds mécaniques donc électriques. - that the response of the sensor is free of mechanical and therefore electrical rebounds.

- que la déformation du capteur soit continue sans présenter de chocs parasites. - that the deformation of the sensor is continuous without presenting parasitic shocks.

La description qui va suivre permettra de mieux se rendre compte de la réalisation proposée. The description which follows will give a better idea of the proposed implementation.

Le premier point consistera à placer le capteur piézo-électrique (1) dans une armature métallique (2) symétrique par rapport à l'axe du capteur 9 le système métallique constituera en quelque sorte une double lame de ressorts solidarisés entre eux par une résine (3). The first point will be to place the piezoelectric sensor (1) in a metal frame (2) symmetrical with respect to the axis of the sensor 9 the metal system will somehow constitute a double leaf spring secured to each other by a resin ( 3).

Le second point sera résolu en isolant le capteur préparé (4) de la chaussée (5) par un système (6) souple type fluide ou élastomère ou résine chargée de caoutchouc ou résine souple. The second point will be resolved by isolating the prepared sensor (4) from the roadway (5) by a flexible system (6) of fluid or elastomer type or resin loaded with rubber or flexible resin.

Le troisième point sera résolu en plaçant la face supérieure 67) du capteur pré moulé (4) en affleurement de la face supérieure (8) de la chaussée. I1 est intéressant que le capteur déborde légèrement du plan supérieur t8) de la chaussée de manière à assurer un contact str entre les pneumatiques et le capteur (4). The third point will be resolved by placing the upper face 67) of the pre-molded sensor (4) flush with the upper face (8) of the road. It is advantageous that the sensor protrudes slightly from the upper plane t8) of the roadway so as to ensure str contact between the tires and the sensor (4).

Le quatrième point sera résolu à partir du moment ou l'amortisseur (6) présentera une viscosité ou un coefficient d'amortissement suffisant pour que la déformation du capteur soit amortie sans vibration. The fourth point will be resolved from the moment when the damper (6) has a viscosity or a damping coefficient sufficient for the deformation of the sensor to be damped without vibration.

Le cinquième point sera résolu en utilisant une forme adaptee pour les enveloppes supérieure et inférieure du capteur. I1 faudra assurer un contact progressif entre la roue et la face (7) métallique du barreau capteur (4). Une forme arrondie dont le début de la face (7) pourra être légèrement recouverte par l'amortisseur (6) conviendra. Il est indispensable qu'une forme analogue existe lorsque la roue quitte le capteur de manière à éviter un mouvement brusque du capteur.  The fifth point will be resolved using a shape suitable for the upper and lower envelopes of the sensor. It will be necessary to ensure progressive contact between the wheel and the metal face (7) of the sensor bar (4). A rounded shape, the start of the face (7) of which may be slightly covered by the shock absorber (6) will be suitable. It is essential that a similar shape exists when the wheel leaves the sensor so as to avoid a sudden movement of the sensor.

Le sixième point sera résolu en réalisant un capteur symètrique dans le sens longitudinal - ce point ne peut être résolu complètement en raison de la connection avec le câble prolongateur. Il convient d'éviter d'introduire une raideur différente au niveau de la connectique. On utilisera donc les lames ressorts supérieure et inférieure comme armature de la connection.  The sixth point will be resolved by making a symmetric sensor in the longitudinal direction - this point cannot be completely resolved due to the connection with the extension cable. It is advisable to avoid introducing a different stiffness at the level of the connections. We will therefore use the upper and lower spring blades as reinforcement for the connection.

Claims (6)

REVENDICATIONS 1/ capteur piézo-électrique de passage et pesée des roues d'un véhicule sur une chaussée, caractérisé en ce que le capteur piézo-électrique co-axial est enrobé symètriquement par rapport à son axe par deux parties métalliques solidarisées entre elles par un matériau adhésif et que cet ensemble est placé dans une saignée pratiquée transversalement à la chaussée et remplie d'un matériau dont la rigidité mécanique est très inférieure à celle de la chaussée. 1 / piezoelectric sensor for passage and weighing of the wheels of a vehicle on a roadway, characterized in that the co-axial piezoelectric sensor is symmetrically coated with respect to its axis by two metal parts joined together by a material adhesive and that this assembly is placed in a groove made transversely to the roadway and filled with a material whose mechanical rigidity is much lower than that of the roadway. 2/ Procédé suivant revendication 1 caractérisé en ce qu'un plan de symètrie du capteur est parallèle à la face supérieure de la chaussée. 2 / A method according to claim 1 characterized in that a symmetry plane of the sensor is parallel to the upper face of the road. 3/ procédé suivant revendication 1 caractérisé en ce que les parties métalliques enrobant le capteur sont de forme légèrement arrondies dans le sens transversal. 3 / A method according to claim 1 characterized in that the metal parts coating the sensor are slightly rounded in shape in the transverse direction. 4/ procédé suivant revendications 1 et , caractérisé en ce que la face supérieure de la face d'une des parties métalliques dépasse légèrement du niveau supérieur de la chaussée. 4 / method according to claims 1 and, characterized in that the upper face of the face of one of the metal parts slightly exceeds the upper level of the roadway. 5/ procédé suivant revendication 1, caractérisé en ce que les matériaux utilisés pour la solidarisation du capteur avec les pièces métalliques est assurée par une résine epoxyde. 5 / A method according to claim 1, characterized in that the materials used for securing the sensor with the metal parts is provided by an epoxy resin. 6/ Procédé suivant revendication 1, caractérisé en ce que le matériau souple est une résine epoxyde souple.  6 / A method according to claim 1, characterized in that the flexible material is a flexible epoxy resin.
FR8411613A 1984-07-13 1984-07-13 Preparation and placing of coaxial piezoelectric sensors in a roadway Withdrawn FR2567550A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR8411613A FR2567550A1 (en) 1984-07-13 1984-07-13 Preparation and placing of coaxial piezoelectric sensors in a roadway

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR8411613A FR2567550A1 (en) 1984-07-13 1984-07-13 Preparation and placing of coaxial piezoelectric sensors in a roadway

Publications (1)

Publication Number Publication Date
FR2567550A1 true FR2567550A1 (en) 1986-01-17

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4712423A (en) * 1985-01-04 1987-12-15 Laboratoire Central Des Ponts Et Chaussees Process and apparatus for measuring the dynamic loads applied to a highway by the road traffic
EP0259523A1 (en) * 1986-09-11 1988-03-16 Philips S.p.A. Apparatus for dynamic statistical weighing of vehicles and/or for counting the axles of trucks or lorries
FR2642775A1 (en) * 1989-02-09 1990-08-10 Electronique Controle Mesure S DEVICE FOR DETECTING THE PASSAGE OF VEHICLES ON A PIEZOELECTRIC FILM PAVEMENT
EP0476562A2 (en) * 1990-09-19 1992-03-25 Hitachi, Ltd. Method and apparatus for controlling moving body and facilities
EP0646777A1 (en) * 1993-10-01 1995-04-05 Pietzsch Aktiengesellschaft Wheel load sensor with piezoelectric measuring element and method of producing the wheel load sensor
FR2764421A1 (en) * 1997-06-09 1998-12-11 Electronique Controle Mesure Detection of passage of wheels or axles on single or dual traffic roadway
EP0997713A1 (en) * 1998-10-29 2000-05-03 K.K. Holding AG Traffic monitoring systems
US6526834B1 (en) 2000-08-23 2003-03-04 Measurement Specialties, Incorporated Piezoelectric sensor
US6853885B2 (en) 2001-10-11 2005-02-08 Electronique Contrôle Mesure Method for processing signals produced by piezoelectric sensors mounted in a roadway for measuring the speed of vehicles
WO2009049341A1 (en) * 2007-10-17 2009-04-23 Batsch Waagen & Edv Gmbh & Co. Kg Device for determining wheel and/or axle loads and/or overall weights of driving road vehicles
CN105735168A (en) * 2016-03-16 2016-07-06 北京万集科技股份有限公司 Road construction method for dynamic weighing device of off-site law enforcement vehicle

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4712423A (en) * 1985-01-04 1987-12-15 Laboratoire Central Des Ponts Et Chaussees Process and apparatus for measuring the dynamic loads applied to a highway by the road traffic
EP0259523A1 (en) * 1986-09-11 1988-03-16 Philips S.p.A. Apparatus for dynamic statistical weighing of vehicles and/or for counting the axles of trucks or lorries
FR2642775A1 (en) * 1989-02-09 1990-08-10 Electronique Controle Mesure S DEVICE FOR DETECTING THE PASSAGE OF VEHICLES ON A PIEZOELECTRIC FILM PAVEMENT
EP0384874A2 (en) * 1989-02-09 1990-08-29 Electronique Controle Mesure Device for the detection of passing vehicles on a road with a piezoelectric film
EP0384874A3 (en) * 1989-02-09 1990-10-03 Electronique Controle Mesure Device for the detection of passing vehicles on a road with a piezoelectric film
EP0476562A2 (en) * 1990-09-19 1992-03-25 Hitachi, Ltd. Method and apparatus for controlling moving body and facilities
EP0476562A3 (en) * 1990-09-19 1993-02-10 Hitachi, Ltd. Method and apparatus for controlling moving body and facilities
US5335180A (en) * 1990-09-19 1994-08-02 Hitachi, Ltd. Method and apparatus for controlling moving body and facilities
EP0646777A1 (en) * 1993-10-01 1995-04-05 Pietzsch Aktiengesellschaft Wheel load sensor with piezoelectric measuring element and method of producing the wheel load sensor
FR2764421A1 (en) * 1997-06-09 1998-12-11 Electronique Controle Mesure Detection of passage of wheels or axles on single or dual traffic roadway
EP0997713A1 (en) * 1998-10-29 2000-05-03 K.K. Holding AG Traffic monitoring systems
US6301544B1 (en) 1998-10-29 2001-10-09 K.K. Holding Ag Traffic monitoring system
US6526834B1 (en) 2000-08-23 2003-03-04 Measurement Specialties, Incorporated Piezoelectric sensor
US6853885B2 (en) 2001-10-11 2005-02-08 Electronique Contrôle Mesure Method for processing signals produced by piezoelectric sensors mounted in a roadway for measuring the speed of vehicles
WO2009049341A1 (en) * 2007-10-17 2009-04-23 Batsch Waagen & Edv Gmbh & Co. Kg Device for determining wheel and/or axle loads and/or overall weights of driving road vehicles
CN105735168A (en) * 2016-03-16 2016-07-06 北京万集科技股份有限公司 Road construction method for dynamic weighing device of off-site law enforcement vehicle
CN105735168B (en) * 2016-03-16 2017-11-10 北京万集科技股份有限公司 A kind of road construction method of non-at-scene enforcement vehicle dynamic weigher

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