EP0675472A1 - Einrichtung zur Erfassung von Daten durch fahrender Fahrzeuge auf einer Strasse - Google Patents
Einrichtung zur Erfassung von Daten durch fahrender Fahrzeuge auf einer Strasse Download PDFInfo
- Publication number
- EP0675472A1 EP0675472A1 EP95200703A EP95200703A EP0675472A1 EP 0675472 A1 EP0675472 A1 EP 0675472A1 EP 95200703 A EP95200703 A EP 95200703A EP 95200703 A EP95200703 A EP 95200703A EP 0675472 A1 EP0675472 A1 EP 0675472A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- profile
- cable
- recess
- piezoelectric
- roadway
- 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- Withdrawn
Links
- 238000001514 detection method Methods 0.000 title claims description 15
- 239000000463 material Substances 0.000 claims description 16
- 229920005989 resin Polymers 0.000 claims description 12
- 239000011347 resin Substances 0.000 claims description 12
- 239000000853 adhesive Substances 0.000 claims description 5
- 230000001070 adhesive effect Effects 0.000 claims description 5
- 229910010293 ceramic material Inorganic materials 0.000 claims 1
- 239000003365 glass fiber Substances 0.000 claims 1
- 238000005259 measurement Methods 0.000 description 21
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 9
- 238000009434 installation Methods 0.000 description 8
- 230000009975 flexible effect Effects 0.000 description 7
- 239000004033 plastic Substances 0.000 description 6
- 229920003023 plastic Polymers 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 4
- 239000004593 Epoxy Substances 0.000 description 4
- 239000003822 epoxy resin Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 229920000647 polyepoxide Polymers 0.000 description 4
- 239000000377 silicon dioxide Substances 0.000 description 4
- 238000005452 bending Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229920002457 flexible plastic Polymers 0.000 description 3
- 239000003292 glue Substances 0.000 description 3
- 239000004570 mortar (masonry) Substances 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 230000035945 sensitivity Effects 0.000 description 3
- 241001080024 Telles Species 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 239000010426 asphalt Substances 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 239000011152 fibreglass Substances 0.000 description 2
- 239000011368 organic material Substances 0.000 description 2
- 238000006116 polymerization reaction Methods 0.000 description 2
- 230000003252 repetitive effect Effects 0.000 description 2
- 206010011376 Crepitations Diseases 0.000 description 1
- 206010013647 Drowning Diseases 0.000 description 1
- 208000037656 Respiratory Sounds Diseases 0.000 description 1
- 241001639412 Verres Species 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 210000004027 cell Anatomy 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 239000006263 elastomeric foam Substances 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000005470 impregnation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
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- 230000008961 swelling Effects 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
Images
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
Definitions
- the invention relates to a device for detecting data relating to the passage of vehicles on a roadway, to be placed in a groove formed in the upper part of this roadway, comprising a first profile provided with an upper U-shaped recess, and a piezoelectric cable of the coaxial type disposed in the bottom of the recess of the first profile.
- the invention finds its application in the detection of passage of vehicles, counting, measurement of speeds, measurement of the masses of vehicles (dynamic loads) and their classification and this in all regions having diverse climatic conditions and in particular severe (climate very hot, temperate or very cold).
- Patent FR 2 482 340 describes a device for detecting passage on a roadway, its laying method and its application to speed detection.
- This device is partly made up of a piezoelectric effect cable.
- This cable is a coaxial shielded cable whose core and sheath are separated by a piezoelectric ceramic.
- This cable has an outside diameter of a few mm, and a length of the order of 1 m or more. It is therefore very thin and long.
- this piezoelectric cable is placed at the bottom of a rigid metal or hard plastic profile, having either the shape of a U, or the shape of a rectangular quadrilateral whose upper face is curved.
- This profile is internally filled with a plastic material curable by polymerization. The aim is to provide a rigid device.
- the profile rigid is coated on its three faces not intended to be in contact with vehicles, with an overmolded envelope of flexible plastic, for example a resin loaded with elastomer, to absorb vibrations. This arrangement is carried out in the factory.
- the method of installing the device includes forming a groove in the pavement, of dimensions slightly larger than those of the device. Then the bottom and the sides of the groove are coated with a flexible plastic absorbing vibrations, and finally the device is placed in the coated groove, so as to fix it, while making it protrude slightly from the upper surface of the pavement. If the profile has the shape of a U, the upper parts of the branches of the U protrude from the upper level of the road by a few mm.
- the coating of the groove is not essential when the device already comprises a molded envelope of flexible plastic produced in the factory.
- a disadvantage of the aforementioned device known from the prior art is that its manufacture uses plastics, which are organic materials and which are particularly sensitive to temperature variations.
- Another drawback of the known device is that the polymerizable plastic material for filling the U-shaped profile is brittle, does not age well, and is easily detached from the walls of this hard protective profile. This means that the device obtained does not support any bending. In its first variant, this device is therefore generally fragile, especially for use on a deformed or curved road; and in particular it is ill-suited to the measurement of moving loads.
- a device for detecting data relating to the passage of vehicles, to be inserted in a groove formed in a pavement which also comprises a piezoelectric cable , protected by a hard U-shaped profile, and embedded in a filling material for the profile.
- the profile has a substantially square section, and is made of metal, for example aluminum; the cable is at a given distance from the bottom of the profile; the filling material to drown the cable is an epoxy mortar loaded with silica.
- the sides of the U-profile are provided with elastomeric foam to absorb longitudinal bending. The assembly is introduced into a groove made in the pavement and is again embedded in an epoxy mortar loaded with silica.
- This second device cited has two advantages over the first device cited, which are: an improvement in performance in the measurement of masses in motion, since it is correctly sensitive to vertical pressures; and an improvement in weather resistance because the filling material in epoxy mortar loaded with silica is essentially provided for this purpose.
- the first drawback was already present in the first device mentioned, and lies in the fact that this second device is also not flexible because the filling resins loaded with silica are very brittle; the second drawback is that it is even more expensive to implement than the second variant of the first device, because its structure is very complex; moreover, the positioning of the piezoelectric cable at a given distance from the bottom of the profile is difficult to achieve, since it is not easy to keep the thin and long cable at a well-determined distance during this filling.
- An object of the present invention is to provide a device for detecting data relating to the passage of vehicles on a roadway, capable of performing as well in simple measurements as counting vehicles, or measuring speeds, as in measuring masses in motion.
- Another object of the invention is to provide such a device capable of providing the different types of measurement over a wide range of temperatures.
- Another object of the invention is to provide such a device in particular capable of mechanically withstanding both bad weather and the repeated passage of heavy vehicles.
- Another object of the invention is to provide such a device which is flexible and can be installed on the upper surface of roadways, possibly subject to deformation over time, for example under the effect of bad weather such as swelling due to rain. , frost, crackles, cracks etc.
- Another object of the invention is to provide such a device which is very simple to produce and very inexpensive, and which is also simple to install in the roadway; so that, for the installation, the circulation is interrupted only for an extremely short period of time.
- the detection device defined in the preamble, further characterized in that it comprises a second profile disposed in the recess of the first profile above the coaxial cable, this second profile having a shape and dimensions such that it fills and fills the remaining volume of the recess above the cable, and that it realizes the closing of this recess.
- the two sections 20 and 30 are made of a material selected.
- the material is preferably formed from a reinforcement of threads or fiber fabrics of glass, which is first impregnated with resin (polyester or epoxyphenolic), and which is then drawn inside a die, and further heated to allow the polymerization of the impregnation resin.
- resin polyyester or epoxyphenolic
- the epoxy resin is used in small quantity, only to hold the parts together, and it does not constitute a material for transmitting pressures: therefore it does not constitute a surface which works - contrary to what occurred in particular the first document cited as a state of technique-.
- the device produced according to the invention there are therefore no drawbacks which were inherent in the use of epoxy resin in the devices known from this state of the art.
- the first means for protecting the piezoelectric cable -which were a hard U-shaped structure in the first state of the art-, and the second means for drowning the cable -which were the filling with the only resin epoxy in this state of the art- are combined and produced overall by the coating formed of the first and second profile, the resin playing for this reason a secondary role limited to the bonding of the parts.
- the resin added for bonding is perfectly suited to this material and plays its role correctly: it adheres perfectly to the walls of the profiles and does not risk coming apart, as c was the case of the resin filling the aluminum profiles for example, in the prior art in question.
- the device obtained according to the invention can be slightly curved without deterioration; it ages well, its longevity is improved, and it retains its performance under all weather conditions.
- the coaxial piezoelectric cable 10 is connected, by a connector 15, to a coaxial transmission cable 16.
- a reference cable "RG 58 will be used in conjunction with the piezoelectric cable VIBRACOAX Cu "from the company THERMOCOAX.
- the connection between this coaxial cable 10 and the transmission extension cable 16 is always fragile; to overcome this drawback, it suffices to coat the connector 15 and a small length of the extension in the system consisting of the first and second sections 20,30, and to stick using glue 40 according to the method of the invention.
- a piezoelectric cable for pressure detection is well known to those skilled in the art: when the piezoelectric material is subjected to an external pressure - here, in the cable 10, the piezoelectric material is subjected to a radial pressure - it delivers electrical charges which are collected by the central conductor 11, or metallic core, of the cable 10. The metallic sheath 12 is brought to ground.
- the compacted piezoelectric powder undergoes a radial polarization treatment during the manufacture of the cable, and therefore shows a sensitivity of the order of 1 V / Bar.
- a trench 120 or groove is made transverse to the upper surface 111 of a roadway 110, in the region where the measurements are required; when the device 100 according to the invention has external dimensions l3, l4 of the order of 20 mm, the trench 120 is made of slightly larger dimensions by means of a mechanical device, suitable for cutting road surfaces. Then the device 100 is installed in this trench 120. Maintaining the device 100 in the trench 120 is simple.
- the device 100 is suspended at the correct height relative to the upper surface of the roadway and is glued with a material which depends on the roadway material. It can be an epoxy resin loaded with sand which is well suited to a concrete pavement or methylmetacrylate which is better suited to asphalt. Other adhesives can be used depending on the type of asphalt or the type of special coating.
- the device 100 is subjected, during the passage of the wheels of vehicles traveling on the roadway, to pressures to which it responds by the emission of electrical signals.
- the device 100 is connected by means of the transmission cable 116 to suitable measuring devices, and not shown because they are not strictly part of the invention, which process the electrical signals transmitted, and provide the required data relating to the dynamic masses, on detection of passage, and / or vehicle speed, etc.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Geophysics And Detection Of Objects (AREA)
- Traffic Control Systems (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9403774 | 1994-03-30 | ||
FR9403774 | 1994-03-30 |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0675472A1 true EP0675472A1 (de) | 1995-10-04 |
Family
ID=9461599
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95200703A Withdrawn EP0675472A1 (de) | 1994-03-30 | 1995-03-22 | Einrichtung zur Erfassung von Daten durch fahrender Fahrzeuge auf einer Strasse |
Country Status (3)
Country | Link |
---|---|
US (1) | US5668540A (de) |
EP (1) | EP0675472A1 (de) |
JP (1) | JPH07272188A (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107301781A (zh) * | 2017-05-04 | 2017-10-27 | 浙江大学 | 一种路面自供能的交通监控装置及方法 |
Families Citing this family (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0912969B1 (de) * | 1996-07-19 | 2000-04-19 | Tracon Systems Ltd. | Passiver verkehrssensor zur automatischen überwachung und verfahren zu seiner herstellung |
US6075466A (en) * | 1996-07-19 | 2000-06-13 | Tracon Systems Ltd. | Passive road sensor for automatic monitoring and method thereof |
US5835027A (en) * | 1996-11-07 | 1998-11-10 | Tyburski; Robert M. | Residual charge effect traffic sensor |
US6204756B1 (en) * | 1998-10-23 | 2001-03-20 | Visteon Global Technologies, Inc. | Diagnostics for vehicle deformation sensor system |
US6764295B2 (en) | 2001-08-08 | 2004-07-20 | J. R. Simplot Company | Rotary cutter |
KR100447764B1 (ko) * | 2002-09-13 | 2004-09-08 | (주)네오정보시스템 | 압력 검지선 및 이를 이용한 탈선감지 시스템 |
US20040211571A1 (en) * | 2003-04-23 | 2004-10-28 | Moreira Oswaldo M. | Control line protector |
FR2881861B1 (fr) * | 2005-02-08 | 2007-04-13 | Eco Compteur Sarl | Detecteur pour compteur de trafic |
US8800390B2 (en) | 2006-02-07 | 2014-08-12 | Michelin Recherche Et Technique S.A. | Contact detector with piezoelectric sensor |
US8413519B2 (en) * | 2006-02-07 | 2013-04-09 | Compagnie Generale Des Etablissements Michelin | Contact detector with piezoelectric sensor |
RU2531654C2 (ru) * | 2013-01-09 | 2014-10-27 | Владимир Ильич Речицкий | Датчик веса автотранспортного средства |
RU2531655C2 (ru) * | 2013-01-09 | 2014-10-27 | Владимир Ильич Речицкий | Датчик веса автотранспортного средства (атс) |
FR3019291B1 (fr) * | 2014-03-31 | 2017-12-01 | Institut Francais Des Sciences Et Technologies Des Transp De L'amenagement Et Des Reseaux | Dispositif d'acquisition, procede de fabrication de celui-ci, procede de mesure de force |
FR3088759B1 (fr) * | 2018-11-16 | 2020-10-23 | Innovative Resources | Dispositif de comptage dynamique de vehicules ameliore |
CN111986478B (zh) * | 2020-08-20 | 2022-03-25 | 杭州海康威视系统技术有限公司 | 车辆分析方法、装置、平台、系统及计算机存储介质 |
CN112796249A (zh) * | 2020-12-30 | 2021-05-14 | 北京科技大学 | 一种分布式光纤应变传感器的封装填埋结构及方法 |
RU2757202C1 (ru) * | 2021-01-15 | 2021-10-12 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Московский автомобильно-дорожный государственный технический университет (МАДИ)" | Датчик динамического измерения веса транспортного средства |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2482340A1 (fr) * | 1980-05-08 | 1981-11-13 | Electronique Controle Mesure S | Dispositif de detection de passage sur une chaussee, son procede de pose et son application a la detection de vitesse |
FR2575827A1 (fr) * | 1985-01-04 | 1986-07-11 | France Etat Ponts Chaussees | Procede de mesure des charges dynamiques appliquees a une chaussee par le trafic routier |
EP0231669A1 (de) * | 1986-01-29 | 1987-08-12 | ETAT FRANCAIS représenté par Le Ministère de l'Urbanisme et du Logement LABORATOIRE CENTRAL DES PONTS ET CHAUSSEES | Verfahren zur Messung der von Fahrzeugen auf Fahrbahnen ausgeübten dynamischen Kräfte |
EP0456325A1 (de) * | 1990-05-11 | 1991-11-13 | Thermocoax | Einrichtung zur Erfassung von Daten durchfahrender Fahrzeuge auf einer Strasse |
DE9302938U1 (de) * | 1993-03-01 | 1993-06-09 | DENSO-Holding GmbH & Co, 51371 Leverkusen | In einer Fahrbahn verlegtes Signalkabel |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3105952A (en) * | 1960-08-04 | 1963-10-01 | Kidder Warren Benjamin | Pressure detecting method and apparatus |
FR2487555A1 (fr) * | 1980-07-28 | 1982-01-29 | Automatisme Cie Gle | Detecteur de passage d'objets pesants sur une chaussee |
GB2084774A (en) * | 1980-09-25 | 1982-04-15 | Transport The Secretary Of Sta | Vehicle axle sensor |
NL8600475A (nl) * | 1986-02-25 | 1987-09-16 | Vitel Communicatie B V | Werkwijze ter vervaardiging van een gewapende signaleringslus voor electronische signalering in een wegdek o.d. en kabelgoot met ingebedde signaleringslus. |
DE3855467T2 (de) * | 1987-04-02 | 1997-02-06 | Gebert | Verkehrsmessanlage |
US5450077A (en) * | 1989-05-03 | 1995-09-12 | Mitron Systems Corporation | Roadway sensor systems |
GB2234380A (en) * | 1989-07-26 | 1991-01-30 | Fenner Co Ltd J H | Axle sensors |
DE3936480A1 (de) * | 1989-11-02 | 1991-05-08 | Werner Beck | Induktionsschleife |
JPH04219198A (ja) * | 1990-12-19 | 1992-08-10 | Nkk Corp | 生物膜濾過装置 |
US5477217A (en) * | 1994-02-18 | 1995-12-19 | International Road Dynamics | Bidirectional road traffic sensor |
-
1995
- 1995-03-22 EP EP95200703A patent/EP0675472A1/de not_active Withdrawn
- 1995-03-30 JP JP7073648A patent/JPH07272188A/ja active Pending
- 1995-03-30 US US08/413,748 patent/US5668540A/en not_active Expired - Fee Related
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2482340A1 (fr) * | 1980-05-08 | 1981-11-13 | Electronique Controle Mesure S | Dispositif de detection de passage sur une chaussee, son procede de pose et son application a la detection de vitesse |
FR2575827A1 (fr) * | 1985-01-04 | 1986-07-11 | France Etat Ponts Chaussees | Procede de mesure des charges dynamiques appliquees a une chaussee par le trafic routier |
EP0231669A1 (de) * | 1986-01-29 | 1987-08-12 | ETAT FRANCAIS représenté par Le Ministère de l'Urbanisme et du Logement LABORATOIRE CENTRAL DES PONTS ET CHAUSSEES | Verfahren zur Messung der von Fahrzeugen auf Fahrbahnen ausgeübten dynamischen Kräfte |
EP0456325A1 (de) * | 1990-05-11 | 1991-11-13 | Thermocoax | Einrichtung zur Erfassung von Daten durchfahrender Fahrzeuge auf einer Strasse |
DE9302938U1 (de) * | 1993-03-01 | 1993-06-09 | DENSO-Holding GmbH & Co, 51371 Leverkusen | In einer Fahrbahn verlegtes Signalkabel |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107301781A (zh) * | 2017-05-04 | 2017-10-27 | 浙江大学 | 一种路面自供能的交通监控装置及方法 |
Also Published As
Publication number | Publication date |
---|---|
JPH07272188A (ja) | 1995-10-20 |
US5668540A (en) | 1997-09-16 |
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