CN201885681U - Multidimensional sensor for detecting dynamic response of asphalt pavements - Google Patents
Multidimensional sensor for detecting dynamic response of asphalt pavements Download PDFInfo
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- CN201885681U CN201885681U CN2010206483934U CN201020648393U CN201885681U CN 201885681 U CN201885681 U CN 201885681U CN 2010206483934 U CN2010206483934 U CN 2010206483934U CN 201020648393 U CN201020648393 U CN 201020648393U CN 201885681 U CN201885681 U CN 201885681U
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Abstract
The utility model discloses a multidimensional sensor for detecting dynamic response of asphalt pavements, which comprises an elastic element, a sensitive element, a hemispherical protecting sleeve, a waterproof adhesive layer and a fixing element. The elastic element is made from elastic modulus and materials similar to asphalt concrete modulus and deforms with asphalt mixed materials in a coordinative manner, the sensitive element is mounted in the middle of the elastic element and used for detecting dynamic strain among layers of an asphalt pavement, the waterproof adhesive layer is compactly filled in the hemispherical protecting sleeve, and the fixing element guarantees coordinative deformation of the elastic element with the asphalt mixed materials of the detected pavement and prevents change of the direction of the elastic element. The sensitive element consists of three strain gages which respectively detect horizontal dynamic strain of a driving direction of a vehicle, horizontal dynamic strain in a direction perpendicular to the driving direction of the vehicle and dynamic strain perpendicular to the ground. The multidimensional sensor is simple in structure, small in volume, low in cost and high in high temperature resistance and detection sensitivity, and can effectively solve the practical problem that the prior art cannot accurately and reliably detect interlayer complicated stress and strain states of the asphalt pavements.
Description
Technical field
The utility model belongs to bituminous pavement Research of dynamic mechanical technical field, especially relates to a kind of multidimensional sensor that is used to detect dynamic response of asphalt pavement.
Background technology
The havoc that bituminous pavement occurs impels people's road pavement structure to further investigate, bituminous pavement internal dynamic mechanical behavior is the effective means of the destruction of research vehicle road pavement under the employing sensor actual traffic load, also is the focus of present this area research.But the sensor that lacks function admirable, reliable in function is the technical bottleneck of studying at present.At present both at home and abroad the sensor that adopts all is " H " type one dimension sensor, only can detect the strain of a direction, and the combination by two or more sensors detects the horizontal dynamic strain of vehicle heading and the horizontal dynamic strain of vertical vehicle heading.Owing at a distance of certain distance, can't detect the dynamic strain of vehicle heading with the vertical vehicle heading of same position between the sensor.And, the dynamic strain that existing sensor can't detection of vertical road surface direction, and this direction dynamic strain road pavement structural mechanical property influence is serious, especially basic unit top compressive strain is used for estimating asphalt pavement rut and damages.In addition, present bituminous pavement mechanics study finds that the inner shearing strain of asphalt is serious to its structural failure influence, and existing sensor can't detect the inner shearing strain of bituminous pavement.
The utility model content
Technical problem to be solved in the utility model is at above-mentioned deficiency of the prior art, a kind of multidimensional sensor that is used to detect dynamic response of asphalt pavement is provided, it is simple in structure, volume is little, cost is low and high temperature resistant, detection sensitivity is high, can effectively solve existingly in the existing dynamic response of asphalt pavement testing process can not carry out accurately bituminous pavement interlayer complex stress strain regime, the practical problems of reliable detection.
For solving the problems of the technologies described above, the technical solution adopted in the utility model is: a kind of multidimensional sensor that is used to detect dynamic response of asphalt pavement, it is characterized in that: comprise one or more detecting units that respectively dynamic response of detected bituminous pavement detected in real time, the structure of a plurality of described detecting units is all identical;
Described detecting unit comprise by the elastic modulus material close with asphalt concrete modulus make and the dynamic response testing process in can with the flexible member of detected pavement asphalt compound compatible deformation, the sensitive element that is installed in flexible member middle part and the dynamic response of detected bituminous pavement is detected in real time, be not subjected to asphalt to damage and can guarantee the semisphere protective sleeve of sensitive element inspection positions asphalt compactness in order to the protection sensitive element, closely knitly be filled in Waterproof glue line and a plurality of retaining element that can guarantee flexible member and detected pavement asphalt compound compatible deformation in the outside around the flexible member and the dynamic response testing process and prevent the cloth set direction change of flexible member in the testing process that is fixedly mounted on respectively that the semisphere protective sleeve is inner and sensitive element is carried out waterproof and dampproof protection, described semisphere protective sleeve from top to bottom spiral-lock forms the cavity that a top has hole for injecting glue and base seal between described semisphere protective sleeve and the flexible member above the sensitive element outside and its semisphere protective sleeve are fixedly mounted on the flexible member middle part; Described flexible member comprises level to elastic support with vertically to being laid in the elasticity column of described level to top, elastic support middle part, and positive middle part and its top that described elasticity column is laid in semisphere protective sleeve inboard are installed on the semisphere protective sleeve; Described sensitive element is to be made up of three foil gauges, foil gauge two that three described foil gauges are respectively foil gauge one that the dynamic strain to vehicle heading detects in real time, detect in real time to the dynamic strain with the perpendicular vertical vehicle heading of described vehicle heading and the foil gauge three that the dynamic strain of the perpendicular ground vertical direction in detected bituminous pavement ground of living in is detected in real time, described vehicle heading distributes at grade with described vertical vehicle heading; The all horizontal paving of described foil gauge one and described foil gauge two in described level on elastic support, and described foil gauge three vertically to paving on the lateral wall of elasticity column.
Above-mentioned a kind of multidimensional sensor that is used to detect dynamic response of asphalt pavement is characterized in that: also comprise six fixed value resistance R1, R2, R3, R4, R5 and R6; The quantity of described detecting unit is two, two described detecting units are respectively detecting unit one and detecting unit two and the two and form the sensor groups that can utilize electric bridge and difference characteristic to realize temperature compensation in the dynamic strain testing process, six fixed value resistance R1, R2, R3, R4, R5 and R6 respectively with two described detecting units in two sensitive elements form three alternating current bridges, and three described alternating current bridges are respectively alternating current bridge one, alternating current bridge two and alternating current bridge three; Two described detecting units all are embedded in detected bituminous pavement inside, and two described detecting units are laid under same the vehicle wheelmark and the spacing between the two is 60m ± 10m;
Two described foil gauges one in two described sensitive elements are serially connected in respectively in adjacent two brachium pontis of alternating current bridge one, and fixed value resistance R1 and R2 are serially connected in respectively in two other brachium pontis of alternating current bridge one, the power supply U that tie point A1 that two described foil gauges are and the tie point B1 between resistance R 1 and R2 connect described alternating current bridge one respectively
iThe power supply positive and negative terminal, two described foil gauges one respectively and the tie point C1 between resistance R 1 and R2 and D1 be respectively the out-put supply U of described alternating current bridge one
oThe positive-negative power output terminal; Two described foil gauges two in two described sensitive elements are serially connected in respectively in adjacent two brachium pontis of alternating current bridge two, and fixed value resistance R3 and R4 are serially connected in respectively in two other brachium pontis of alternating current bridge two, the power supply U that tie point A2 that two described foil gauges are two and the tie point B2 between resistance R 3 and R4 connect described alternating current bridge two respectively
iThe power supply positive and negative terminal, two described foil gauges two respectively and the tie point C2 between resistance R 3 and R4 and D2 be respectively the out-put supply U of described alternating current bridge two
oThe positive-negative power output terminal; Two described foil gauges three in two described sensitive elements are serially connected in respectively in adjacent two brachium pontis of alternating current bridge three, and fixed value resistance R5 and R6 are serially connected in respectively in two other brachium pontis of alternating current bridge three, the power supply U that tie point A3 that two described foil gauges are three and the tie point B3 between resistance R 5 and R6 connect described alternating current bridge three respectively
iThe power supply positive and negative terminal, two described foil gauges three respectively and the tie point C3 between resistance R 5 and R6 and D3 be respectively the out-put supply U of described alternating current bridge three
oThe positive-negative power output terminal.
Above-mentioned a kind of multidimensional sensor that is used to detect dynamic response of asphalt pavement, it is characterized in that: described level is served as reasons to elastic support and is laid in " ten " font flexible member that two elastic rods on the same surface level are formed, and the middle part of described " ten " font flexible member is provided with the level of described foil gauge one of confession and two installations of described foil gauge to round tray.
Above-mentioned a kind of multidimensional sensor that is used to detect dynamic response of asphalt pavement, it is characterized in that: the quantity of described retaining element is four, the structure of four retaining elements and the respectively symmetrical both ends that are fixedly mounted on two described elastic rods all identical with size, the upper level of four retaining elements is higher than the upper level of flexible member.
Above-mentioned a kind of multidimensional sensor that is used to detect dynamic response of asphalt pavement is characterized in that: described retaining element is vertical laying between the baffle plate made by nylon material and described baffle plate and the described elastic rod.
Above-mentioned a kind of multidimensional sensor that is used to detect dynamic response of asphalt pavement is characterized in that: the elastic construction of described flexible member for being made by nylon material.
Above-mentioned a kind of multidimensional sensor that is used to detect dynamic response of asphalt pavement is characterized in that: described level has the wire hole that passes for the lead that connects sensitive element on round tray.
Above-mentioned a kind of multidimensional sensor that is used to detect dynamic response of asphalt pavement, it is characterized in that: described level is connected with thread connecting mode between elastic support and the elasticity column, and described level is provided with external thread to the corresponding screw and the described elasticity column bottom correspondence of installing for the elasticity column of being provided with in elastic support middle part.
Above-mentioned a kind of multidimensional sensor that is used to detect dynamic response of asphalt pavement is characterized in that: the top of described elasticity column exceeds semisphere protective sleeve top 1mm～2mm, and semisphere protective sleeve top has the leghole that passes for the elasticity column.
Above-mentioned a kind of multidimensional sensor that is used to detect dynamic response of asphalt pavement, it is characterized in that: side has four mounting grooves around the described semisphere protective sleeve, and the semisphere protective sleeve is fixedly mounted on two described elastic rods by four described mounting grooves, and the structure of described mounting groove is corresponding with the structure of described elastic rod; The inner chamber difference of described semisphere protective sleeve is two cavitys up and down, and wherein upper chamber is that semisphere and lower cavity are cylindrical; Described semisphere protective sleeve is a metal matter body, and described hole for injecting glue is laid in described metal matter body middle and upper part.
The utility model compared with prior art has the following advantages:
1, can bear in the work progress rolling of street roller and rub destruction, also can bear the high temperature action of asphalt, and survival rate of the present utility model reach more than 90% up to 180 ℃.
2, highly sensitive, noise resisting ability is strong, even have only 3-5 microstrain, the utility model also can normally detect and detect respond well, can satisfy rural road structure dynamic response and detect requirement.
3, simple in structure, easy to use and low price, highly sensitive, can either detect the dynamic response of asphaltic road-mix surface course, can detect the dynamic response of semi-rigid type base again.
4, adopt bridge diagram, simple in structure, be easy to processing.
5, result of use is good, lay easy for installationly, the utility model is a kind of built-in type sensor, can be arranged in predeterminated position when road construction, neither influence the road normal construction, can guarantee that again sensing station road surface mechanical property is consistent with other position mechanical property.
6, performance is comprehensive and easy to use, be a kind of multidimensional sensor, can detect simultaneously the bituminous pavement same position along the horizontal dynamic strain of vehicle heading, the horizontal dynamic strain of vertical vehicle heading and the dynamic strain of vertical road surface direction, more existing unidirectional strain transducer, test item can more in depth be studied the bituminous pavement dynamic mechanical behavior more comprehensively.
7, testing result of the present utility model can be estimated bituminous pavement anti-fatigue performance and anti-rut performance, the horizontal stretching strain of the asphalt mat bottom that detection obtains can be used for estimating the bituminous pavement anti-fatigue performance, detects the vertical compressive strain in basic unit top that obtains and can be used for estimating the asphalt pavement rut resisting performance.
8, testing result of the present utility model can be used for studying the strain of bituminous pavement internal shearing stress: it is the principal strain of three orthogonal directions of detection position bituminous pavement that the utility model can detect the horizontal dynamic strain of the vehicle heading that obtains, the horizontal dynamic strain of vertical vehicle heading and the dynamic strain of vertical road surface direction simultaneously, according to Elasticity knowledge, can infer the shearing strain in three faces.
9, detect functional and stable work in work, reliable, be in particular in the following aspects:
1) do not influence the mechanical property of pavement structure: after this sensor is put into the bituminous concrete road, can follow road structure and be out of shape together, belong to imposed deformation; Because bituminous concrete is originally as flexible material, if outside employed flexible member of strain gauge of sensor or protective device rigidity are too big, then just increased the rigidity of detection position, influence accuracy of detection, finally lose the meaning of test.Adopt material modulus to be lower than the material flexible member of asphalt modulus slightly in the utility model, can overcome above problem; 2) one-piece construction is smaller, thereby can satisfy the dynamic response detection demand of bituminous pavement; 3) high temperature resistant: during pavement construction, the asphalt concrete material temperature is higher, especially the modified bitumen temperature usually reaches 180 ℃, the condition of high temperature not only can produce structural destruction to the sensor of imbedding, and the mechanical property of sensor also produced serious destruction, thereby bituminous pavement all proposes certain high temperature resistant requirement to sensor sensing element, flexible member and silica gel and lead when detecting, and employed each assembly of the utility model all has resistance to elevated temperatures, thereby the dynamic response that can satisfy under the condition of high temperature detects demand; 4) can detect the horizontal dynamic strain of bituminous pavement interlayer same position vehicle heading, the horizontal dynamic strain of vertical vehicle heading and the dynamic strain of vertical road surface direction simultaneously, more existing unidirectional strain transducer, test item can more in depth be studied the bituminous pavement dynamic mechanical behavior more comprehensively; 5) highly sensitive; 6) adopting two detecting units both to finish the temperature compensation task well, save instrument channel again, is a kind of good dynamic strain detection method.
In sum, the utility model is simple in structure, volume is little, cost is low and high temperature resistant, detection sensitivity is high, can effectively solve existingly in the existing dynamic response of asphalt pavement testing process can not carry out accurately bituminous pavement interlayer complex stress strain regime, the practical problems of reliable detection.
Below by drawings and Examples, the technical solution of the utility model is described in further detail.
Description of drawings
Fig. 1 is the structural representation of a detecting unit of the utility model.
Fig. 2 is the A-A cut-open view of Fig. 1.
Fig. 3 is the structural representation of the utility model semisphere protective sleeve.
Fig. 4 is the A-A cut-open view of Fig. 3.
Fig. 5 is the user mode reference diagram of the utility model level to elastic support and retaining element.
Fig. 6 is the A-A cut-open view of Fig. 5.
Fig. 7 is the user mode reference diagram of the utility model elasticity column.
Fig. 8 is the circuit theory diagrams of two detecting units of the utility model.
Description of reference numerals:
The 1-flexible member; The 1-1-level is to elastic support; 1-2-elasticity column;
The 2-retaining element; The 3-sensitive element; 3-1-foil gauge one;
3-2-foil gauge two; 3-3-foil gauge three; 4-semisphere protective sleeve;
The 5-Waterproof glue line; 6-1-detecting unit one; 6-2-detecting unit two;
The 7-hole for injecting glue; The 8-wire hole; The 9-mounting groove;
The 10-leghole; The 11-screw; The 12-hex bolts;
The 13-top end cover.
Embodiment
As shown in Figure 1 and Figure 2, the utility model comprises one or more detecting units that respectively dynamic response of detected bituminous pavement detected in real time, and the structure of a plurality of described detecting units is all identical.In the actual use, can be according to the actual detected needs, correspondingly in detected bituminous pavement, lay one or more detecting units.
Described detecting unit comprise by the elastic modulus material close with asphalt concrete modulus make and the dynamic response testing process in can with the flexible member 1 of detected pavement asphalt compound compatible deformation; the sensitive element 3 that is installed in flexible member 1 middle part and the dynamic response of detected bituminous pavement is detected in real time; be not subjected to asphalt to damage and can guarantee the semisphere protective sleeve 4 of sensitive element 3 inspection positions asphalt compactnesss in order to protection sensitive element 3; closely knitly be filled in Waterproof glue line 5 and a plurality of retaining element 2 that can guarantee flexible member 1 and detected pavement asphalt compound compatible deformation in the outside around the flexible member 1 and the dynamic response testing process and prevent the cloth set direction change of flexible member 1 in the testing process that is fixedly mounted on respectively that semisphere protective sleeve 4 is inner and sensitive element 3 is carried out waterproof and dampproof protection; described semisphere protective sleeve 4 from top to bottom spiral-lock forms the cavity that a top has hole for injecting glue 7 and base seal between described semisphere protective sleeve 4 and the flexible member 1 above sensitive element 3 outsides and its semisphere protective sleeve 4 are fixedly mounted on flexible member 1 middle part.Described flexible member 1 comprises level to elastic support 1-1 with vertically to being laid in the elasticity column 1-2 of described level to top, elastic support 1-1 middle part, and positive middle part and its top that described elasticity column 1-2 is laid in semisphere protective sleeve 4 inboards are installed on the semisphere protective sleeve 4.Described sensitive element 3 is to be made up of three foil gauges, foil gauge two 3-2 that three described foil gauges are respectively foil gauge one 3-1 that the dynamic strain to vehicle heading detects in real time, detect in real time to the dynamic strain with the perpendicular vertical vehicle heading of described vehicle heading and foil gauge three 3-3 that the dynamic strain of the perpendicular ground vertical direction in detected bituminous pavement ground of living in is detected in real time, described vehicle heading distributes at grade with described vertical vehicle heading.Described foil gauge one 3-1 and all horizontal paving of described foil gauge two 3-2 in described level on elastic support 1-1, and described foil gauge three 3-3 vertically to paving on the lateral wall of elasticity column 1-2.In the present embodiment, described foil gauge three 3-3 are vertically to the lateral wall middle part of paving at elasticity column 1-2.
In conjunction with Fig. 8, in the present embodiment, the utility model also comprises six fixed value resistance R1, R2, R3, R4, R5 and R6; The quantity of described detecting unit is two, two described detecting units are respectively detecting unit one 6-1 and detecting unit two 6-2 and the two and form the sensor groups that can utilize electric bridge and difference characteristic to realize temperature compensation in the dynamic strain testing process, six fixed value resistance R1, R2, R3, R4, R5 and R6 respectively with two described detecting units in two sensitive elements 3 form three alternating current bridges, and three described alternating current bridges are respectively alternating current bridge one, alternating current bridge two and alternating current bridge three; Two described detecting units all are embedded in detected bituminous pavement inside, and two described detecting units are laid under same the vehicle wheelmark and the spacing between the two is 60m ± 10m.
In the present embodiment, the spacing between two described detecting units is 60m, can the spacing between two described detecting units be adjusted accordingly in 60m ± 10m scope according to concrete detection highway section in the actual use.
Two described foil gauge one 3-1 in two described sensitive elements 3 are serially connected in respectively in adjacent two brachium pontis of alternating current bridge one, and fixed value resistance R1 and R2 are serially connected in respectively in two other brachium pontis of alternating current bridge one, the power supply U that tie point A1 between two described foil gauge one 3-1 and the tie point B1 between resistance R 1 and R2 connect described alternating current bridge one respectively
iThe power supply positive and negative terminal, two described foil gauge one 3-1 respectively and the tie point C1 between resistance R 1 and R2 and D1 be respectively the out-put supply U of described alternating current bridge one
oThe positive-negative power output terminal; Two described foil gauge two 3-2 in two described sensitive elements 3 are serially connected in respectively in adjacent two brachium pontis of alternating current bridge two, and fixed value resistance R3 and R4 are serially connected in respectively in two other brachium pontis of alternating current bridge two, the power supply U that tie point A2 between two described foil gauge two 3-2 and the tie point B2 between resistance R 3 and R4 connect described alternating current bridge two respectively
iThe power supply positive and negative terminal, two described foil gauge two 3-2 respectively and the tie point C2 between resistance R 3 and R4 and D2 be respectively the out-put supply U of described alternating current bridge two
oThe positive-negative power output terminal; Two described foil gauge three 3-3 in two described sensitive elements 3 are serially connected in respectively in adjacent two brachium pontis of alternating current bridge three, and fixed value resistance R5 and R6 are serially connected in respectively in two other brachium pontis of alternating current bridge three, the power supply U that tie point A3 between two described foil gauge three 3-3 and the tie point B3 between resistance R 5 and R6 connect described alternating current bridge three respectively
iThe power supply positive and negative terminal, two described foil gauge three 3-3 respectively and the tie point C3 between resistance R 5 and R6 and D3 be respectively the out-put supply U of described alternating current bridge three
oThe positive-negative power output terminal.
In conjunction with Fig. 5, Fig. 6 and Fig. 7, in the present embodiment, described level is served as reasons to elastic support 1-1 and is laid in " ten " font flexible member that two elastic rods on the same surface level are formed, and the middle part of described " ten " font flexible member is provided with the level of described foil gauge one 3-1 of confession and described foil gauge two 3-2 installation to round tray.When the elastic construction of described flexible member 1 for making, actual processing and fabricating, also can select the close material flexible member 1 of other elastic modulus and asphalt concrete modulus for use by nylon material.Described level has the wire hole 8 that passes for the lead that connects sensitive element 3 on round tray, the wire hole of being laid 8 can prevent effectively that lead from scratching.
In the present embodiment, the quantity of described retaining element 2 is four, the structure of four retaining elements 2 and respectively symmetrical both ends that are fixedly mounted on two described elastic rods all identical with size, the upper level of four retaining elements 2 is higher than the upper level of flexible member 1.Described retaining element 2 is vertical laying between the baffle plate made by nylon material and described baffle plate and the described elastic rod.During actual processing and fabricating, also can select the close material retaining element 2 of other elastic modulus and asphalt concrete modulus for use.
In the present embodiment, the actual laying when installing, described level is connected with thread connecting mode between elastic support 1-1 and the elasticity column 1-2, described level is provided with external thread to the corresponding screw 11 and the described elasticity column 1-2 bottom correspondence of installing for elasticity column 1-2 of being provided with in elastic support 1-1 middle part, and the bottom of elasticity column 1-2 fixes by hex bolts 12 and its top is provided with top end cover 13.The top of described elasticity column 1-2 exceeds semisphere protective sleeve 4 top 1mm～2mm, and semisphere protective sleeve 4 tops have the leghole 10 that passes for elasticity column 1-2.
In the present embodiment, during actual processing and fabricating, two described elastic rods, described levels are one and all adopt nylon material to process to round tray and four retaining element 2 processing and fabricatings, and two described elastic rods, described levels are formed a cruciform nylon sheet (being that level is to elastic support 1-1) to round tray and four retaining element 2 processing.The nylon column of described elasticity column 1-2 for making by nylon material.
In conjunction with Fig. 3, Fig. 4, in the present embodiment, side has four mounting grooves 9 around the described semisphere protective sleeve 4, and semisphere protective sleeve 4 is fixedly mounted on two described elastic rods by four described mounting grooves 9, and the structure of described mounting groove 9 is corresponding with the structure of described elastic rod; The inner chamber difference of described semisphere protective sleeve 4 is two cavitys up and down, and wherein upper chamber is that semisphere and lower cavity are cylindrical.Described semisphere protective sleeve 4 is a metal matter body, and described hole for injecting glue 7 is laid in described metal matter body middle and upper part.
To sum up; in the present embodiment; a detecting unit of the present utility model mainly is made up of cruciform nylon sheet, semisphere protective sleeve 4, nylon column and the sensitive element 3 that is installed on the cross nylon sheet, and three foil gauges in the sensitive element 3 can detect simultaneously along the dynamic strain of vehicle heading, vertical vehicle heading and vertical ground direction.
Wherein, described semisphere protective sleeve 4 plays a protective role to lead and the solder joint that is installed in strain rosette on the cross nylon sheet, connects sensitive element 3 for metal construction and its; The outside surface of semisphere protective sleeve 4 is spherical simultaneously; it can make work progress medium pitch compound flow along the sphere of semisphere protective sleeve 4; thereby effectively guaranteed the compactness of sensitive element 3 inspection positions asphalts, can guarantee that detecting unit of the present utility model does not influence the mechanical property on road surface.In addition; semisphere protective sleeve 4 inside are semisphere and columniform the combination (being that its upper chamber is that semisphere and lower cavity are cylindrical); and all sides of semisphere protective sleeve 4 offer 4 mounting grooves 9; be convenient to cooperate with the cruciform nylon sheet installation (specifically be with the cruciform nylon sheet in four transmission rod clearance fit), and can prevent that semisphere protective sleeve 4 from rotating.Simultaneously; semisphere protective sleeve 4 tops are provided with a hole for injecting glue 7; after semisphere protective sleeve 4 installs with the cruciform nylon sheet; inject marine glue (being specially silica gel) from this hole for injecting glue 7; sensitive element 3 is played waterproof and dampproof effect; prevent that sensitive element 3 is subjected to the water enchroachment (invasion) evil, is convenient to long-term use of the present utility model.Described semisphere protective sleeve 4 center upper portion have the leghole 10 that passes for elasticity column 1-2; add man-hour; transition fit between elasticity column 1-2 and the leghole 10; make semisphere protective sleeve 4 bear asphalt to horizontal push effect of the present utility model; elasticity column 1-2 only bears asphalt to uniaxial pressure effect of the present utility model (specifically being vertical direction), thereby has eliminated the influence of undesired signal.
Described cruciform nylon sheet is an elastic sensing element of the present utility model, play the effect of transmitting the road surface dynamic strain, the employing nylon material is made, also can adopt other elastic modulus to make less than the material of the elastic modulus of asphalt under the normal temperature slightly, described cruciform nylon sheet can effectively guarantee the utility model can with the bituminous pavement compatible deformation.Described cruciform nylon sheet is cruciform, and being laid with four baffle plates all around is retaining element 2.During actual the use, described cruciform nylon sheet is embedded in asphalt, and described cruciform nylon sheet generation corresponding deformation is forced in the distortion of asphalt, and described cruciform nylon sheet middle part is provided with level to round tray, is convenient to paste sensitive element 3.The effect of the retaining element of laying 2 mainly contains two aspects on the described flexible member 1: 1) in work progress, play positioning action, prevent that the traction of the asphalt that flows from making the utility model rotate; 2) during input, be embedded in asphalt, the distortion of asphalt forces the cruciform nylon sheet that corresponding distortion takes place, and the strain of guaranteeing the cruciform nylon sheet and the strain facies of asphalt are together.The screw 11 that described cruciform nylon sheet middle part is offered is for installing and fixing the mounting hole of elasticity column 1-2, the upper end of described retaining element 2 is set to circular arc chamfering, and this circular arc chamfering can improve the flowability of pavement construction process medium pitch compound, both improved the compactness of the utility model installation position place pavement structure, prevented again that the utility model from being destroyed by stone.
Described cruciform nylon sheet middle part is laid with sensitive element 3, described sensitive element 3 is a sensitive element of the present utility model, and it is made up of 3 foil gauges, foil gauge one 3-1 that is laid in described cruciform nylon sheet middle part in three described foil gauges and foil gauge two 3-2 detect with dynamic strain with the perpendicular vertical vehicle heading of described vehicle heading in real time to the dynamic strain of vehicle heading respectively, being laid in elasticity column 1-2 (also is elastic sensing element of the present utility model, the employing nylon material is made, elastic modulus has guaranteed the compatible deformation of the utility model and bituminous pavement slightly less than the elastic modulus of asphalt under the normal temperature) on the dynamic strain (being the vertical compressive strain of detected bituminous pavement) of the perpendicular ground vertical direction in the detected bituminous pavement of foil gauge three 3-3 ground of living in detect in real time.
In the present embodiment, during actual the use, adopt two detecting units and cooperate the alternating current bridge circuit to use, because the structure of detected bituminous pavement is the semi-infinite body structure, and asphalt is viscoelastic material, and it is serious to expand with heat and contract with cold, thereby when carrying out the dynamic response of asphalt pavement test, need to adopt technique for temperature compensation to eliminate Temperature Influence, and temperature compensation commonly used at present can't satisfy the temperature compensation needs of this intermediate item.Therefore, temperature compensation is one of gordian technique of such test.
In the present embodiment, during actual the use, adopt two detecting units and cooperate the alternating current bridge circuit to use, because the structure of detected bituminous pavement is the semi-infinite body structure, and asphalt is viscoelastic material, and it is serious to expand with heat and contract with cold, thereby when carrying out the dynamic response of asphalt pavement test, need to adopt technique for temperature compensation to eliminate Temperature Influence, and temperature compensation commonly used at present can't satisfy the temperature compensation needs of this intermediate item.Therefore, temperature compensation is one of gordian technique of such test.
In the present embodiment, when the utility model uses, needs according to the research dynamic response of asphalt pavement, to be arranged in before and after two detecting units between same vehicle wheelmark below and two detecting units at a distance of 60m, to guarantee the cruising state of vehicle, like this, when previous detecting unit was positioned at the wheel weight zone of influence, the strain that a back detecting unit present position produces owing to carload was 0; And the detecting unit in back is when being positioned at the wheel weight zone of influence, and the strain that previous detecting unit present position produces owing to carload is 0.During actual the use, because former and later two detecting units are arranged in the same depth position in the detected asphalt pavement structure, thereby can guarantee that pavement temperature changes the time, the temperature strain that two detecting units are experienced is identical, like this two foil gauges that are used to detect the equidirectional dynamic strain in two detecting units all are connected on the adjacent brachium pontis of an alternating current bridge, utilize electric bridge with the difference characteristic, just can realize temperature compensation.
The above; it only is preferred embodiment of the present utility model; be not that the utility model is imposed any restrictions; everyly any simple modification that above embodiment did, change and equivalent structure are changed, all still belong in the protection domain of technical solutions of the utility model according to the utility model technical spirit.
Claims (10)
1. multidimensional sensor that is used to detect dynamic response of asphalt pavement is characterized in that: comprise one or more detecting units that respectively dynamic response of detected bituminous pavement detected in real time, the structure of a plurality of described detecting units is all identical;
Described detecting unit comprise by the elastic modulus material close with asphalt concrete modulus make and the dynamic response testing process in can with the flexible member (1) of detected pavement asphalt compound compatible deformation, the sensitive element (3) that is installed in flexible member (1) middle part and the dynamic response of detected bituminous pavement is detected in real time, be not subjected to asphalt to damage and can guarantee the semisphere protective sleeve (4) of sensitive element (3) inspection positions asphalt compactness in order to protection sensitive element (3), the closely knit semisphere protective sleeve (4) that is filled in is inner and sensitive element (3) carried out the Waterproof glue line (5) of waterproof and dampproof protection and a plurality ofly be fixedly mounted on the retaining element (2) that flexible member (1) can guarantee flexible member (1) and detected pavement asphalt compound compatible deformation in the outside and the dynamic response testing process all around and prevent the cloth set direction change of flexible member in the testing process (1) respectively, described semisphere protective sleeve (4) from top to bottom spiral-lock in sensitive element (3) outside and its semisphere protective sleeve (4) be fixedly mounted on top, flexible member (1) middle part, top of formation has the cavity of hole for injecting glue (7) and base seal between described semisphere protective sleeve (4) and the flexible member (1); Described flexible member (1) comprises level to elastic support (1-1) with vertically to being laid in the elasticity column (1-2) of described level to top, elastic support (1-1) middle part, and described elasticity column (1-2) is laid in semisphere protective sleeve (4) inboard positive middle part and its top and is installed on the semisphere protective sleeve (4); Described sensitive element (3) is to be made up of three foil gauges, foil gauge two (3-2) that three described foil gauges are respectively foil gauge one (3-1) that the dynamic strain to vehicle heading detects in real time, detect in real time to the dynamic strain with the perpendicular vertical vehicle heading of described vehicle heading and the foil gauge three (3-3) that the dynamic strain of the perpendicular ground vertical direction in detected bituminous pavement ground of living in is detected in real time, described vehicle heading distributes at grade with described vertical vehicle heading; Described foil gauge one (3-1) and all horizontal paving of described foil gauge two (3-2) in described level on elastic support (1-1), and described foil gauge three (3-3) vertically to paving on the lateral wall of elasticity column (1-2).
2. according to the described a kind of multidimensional sensor that is used to detect dynamic response of asphalt pavement of claim 1, it is characterized in that: also comprise six fixed value resistance R1, R2, R3, R4, R5 and R6; The quantity of described detecting unit is two, two described detecting units are respectively detecting unit one (6-1) and detecting unit two (6-2) and the two and form the sensor groups that can utilize electric bridge and difference characteristic to realize temperature compensation in the dynamic strain testing process, six fixed value resistance R1, R2, R3, R4, R5 and R6 respectively with two described detecting units in two sensitive elements (3) form three alternating current bridges, and three described alternating current bridges are respectively alternating current bridge one, alternating current bridge two and alternating current bridge three; Two described detecting units all are embedded in detected bituminous pavement inside, and two described detecting units are laid under same the vehicle wheelmark and the spacing between the two is 60m ± 10m;
Two described foil gauges one (3-1) in two described sensitive elements (3) are serially connected in respectively in adjacent two brachium pontis of alternating current bridge one, and fixed value resistance R1 and R2 are serially connected in respectively in two other brachium pontis of alternating current bridge one, and tie point A1 between two described foil gauges one (3-1) and the tie point B1 between resistance R 1 and R2 meet the power supply U of described alternating current bridge one respectively
iThe power supply positive and negative terminal, two described foil gauges one (3-1) respectively and the tie point C1 between resistance R 1 and R2 and D1 be respectively the out-put supply U of described alternating current bridge one
oThe positive-negative power output terminal; Two described foil gauges two (3-2) in two described sensitive elements (3) are serially connected in respectively in adjacent two brachium pontis of alternating current bridge two, and fixed value resistance R3 and R4 are serially connected in respectively in two other brachium pontis of alternating current bridge two, and tie point A2 between two described foil gauges two (3-2) and the tie point B2 between resistance R 3 and R4 meet the power supply U of described alternating current bridge two respectively
iThe power supply positive and negative terminal, two described foil gauges two (3-2) respectively and the tie point C2 between resistance R 3 and R4 and D2 be respectively the out-put supply U of described alternating current bridge two
oThe positive-negative power output terminal; Two described foil gauges three (3-3) in two described sensitive elements (3) are serially connected in respectively in adjacent two brachium pontis of alternating current bridge three, and fixed value resistance R5 and R6 are serially connected in respectively in two other brachium pontis of alternating current bridge three, and tie point A3 between two described foil gauges three (3-3) and the tie point B3 between resistance R 5 and R6 meet the power supply U of described alternating current bridge three respectively
iThe power supply positive and negative terminal, two described foil gauges three (3-3) respectively and the tie point C3 between resistance R 5 and R6 and D3 be respectively the out-put supply U of described alternating current bridge three
oThe positive-negative power output terminal.
3. according to claim 1 or 2 described a kind of multidimensional sensors that are used to detect dynamic response of asphalt pavement, it is characterized in that: described level is served as reasons to elastic support (1-1) and is laid in " ten " font flexible member that two elastic rods on the same surface level are formed, and the middle part of described " ten " font flexible member is provided with the level of confession described foil gauge one (3-1) and described foil gauge two (3-2) installation to round tray.
4. according to the described a kind of multidimensional sensor that is used to detect dynamic response of asphalt pavement of claim 3, it is characterized in that: the quantity of described retaining element (2) is four, the structure of four retaining elements (2) and the respectively symmetrical both ends that are fixedly mounted on two described elastic rods all identical with size, the upper level of four retaining elements (2) is higher than the upper level of flexible member (1).
5. according to the described a kind of multidimensional sensor that is used to detect dynamic response of asphalt pavement of claim 4, it is characterized in that: described retaining element (2) is vertical laying between the baffle plate made by nylon material and described baffle plate and the described elastic rod.
6. according to the described a kind of multidimensional sensor that is used to detect dynamic response of asphalt pavement of claim 5, it is characterized in that: the elastic construction of described flexible member (1) for making by nylon material.
7. according to the described a kind of multidimensional sensor that is used to detect dynamic response of asphalt pavement of claim 4, it is characterized in that: described level has the wire hole (8) that passes for the lead that connects sensitive element (3) on round tray.
8. according to claim 1 or 2 described a kind of multidimensional sensors that are used to detect dynamic response of asphalt pavement, it is characterized in that: described level is connected with thread connecting mode between elastic support (1-1) and the elasticity column (1-2), and described level is provided with the screw (11) and described elasticity column (1-2) the bottom correspondence of installing for elasticity column (1-2) to elastic support (1-1) middle part correspondence and is provided with external thread.
9. according to claim 1 or 2 described a kind of multidimensional sensors that are used to detect dynamic response of asphalt pavement; it is characterized in that: the top of described elasticity column (1-2) exceeds semisphere protective sleeve (4) top 1mm～2mm, and semisphere protective sleeve (4) top has the leghole (10) that passes for elasticity column (1-2).
10. according to the described a kind of multidimensional sensor that is used to detect dynamic response of asphalt pavement of claim 3, it is characterized in that: side has four mounting grooves (9) around the described semisphere protective sleeve (4), and semisphere protective sleeve (4) is fixedly mounted on two described elastic rods by four described mounting grooves (9), and the structure of described mounting groove (9) is corresponding with the structure of described elastic rod; The inner chamber difference of described semisphere protective sleeve (4) is two cavitys up and down, and wherein upper chamber is that semisphere and lower cavity are cylindrical; Described semisphere protective sleeve (4) is a metal matter body, and described hole for injecting glue (7) is laid in described metal matter body middle and upper part.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010206483934U CN201885681U (en) | 2010-12-08 | 2010-12-08 | Multidimensional sensor for detecting dynamic response of asphalt pavements |
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| CN2010206483934U CN201885681U (en) | 2010-12-08 | 2010-12-08 | Multidimensional sensor for detecting dynamic response of asphalt pavements |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103266551A (en) * | 2013-04-15 | 2013-08-28 | 同济大学 | Fixing device for cement concrete pavement health monitoring sensors |
| CN103808914A (en) * | 2014-02-07 | 2014-05-21 | 中国民航大学 | Airport asphalt concrete pavement performance acquisition system and control evaluation method |
| CN105928644A (en) * | 2016-06-29 | 2016-09-07 | 中交第二公路勘察设计研究院有限公司 | Strain gauge for monitoring pavement structure |
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2010
- 2010-12-08 CN CN2010206483934U patent/CN201885681U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103266551A (en) * | 2013-04-15 | 2013-08-28 | 同济大学 | Fixing device for cement concrete pavement health monitoring sensors |
| CN103266551B (en) * | 2013-04-15 | 2015-08-19 | 同济大学 | A kind of cement concrete paving health monitoring sensor fastening device |
| CN103808914A (en) * | 2014-02-07 | 2014-05-21 | 中国民航大学 | Airport asphalt concrete pavement performance acquisition system and control evaluation method |
| CN103808914B (en) * | 2014-02-07 | 2015-07-29 | 中国民航大学 | A kind of airport asphalt concrete pavement performance acquisition system and control evaluation method |
| CN105928644A (en) * | 2016-06-29 | 2016-09-07 | 中交第二公路勘察设计研究院有限公司 | Strain gauge for monitoring pavement structure |
| CN105928644B (en) * | 2016-06-29 | 2018-07-31 | 中交第二公路勘察设计研究院有限公司 | A kind of strain gauge for pavement structure monitoring |
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