CN102095364B - Plane sensor used for detecting strain between asphalt road surfaces - Google Patents
Plane sensor used for detecting strain between asphalt road surfaces Download PDFInfo
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- CN102095364B CN102095364B CN2010105793389A CN201010579338A CN102095364B CN 102095364 B CN102095364 B CN 102095364B CN 2010105793389 A CN2010105793389 A CN 2010105793389A CN 201010579338 A CN201010579338 A CN 201010579338A CN 102095364 B CN102095364 B CN 102095364B
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Abstract
The invention discloses a plane sensor used for detecting strain between asphalt road surfaces, comprising an elastic element, a sensitive element, a hemispheric protective sleeve, a waterproof adhesive layer and a fixing element, wherein the elastic element is made of a material with similar elastic modulus and asphalt concrete modulus and is subjected to harmonious deformation together with an asphalt mixture; the sensitive element is installed in the middle of the elastic element and can detect the dynamic strain between the asphalt road surfaces; the waterproof adhesive layer is compactly filled in the hemispheric protective sleeve; the fixing element guarantees the harmonious deformation of the elastic element and the detected road surface asphalt mixture and prevents the direction of the elastic element from changing during the detection process; and the sensitive element is a strain rosette composed of three strain gages for detecting the dynamic strains of vehicle driving direction, direction vertical to the vehicle driving direction, and direction having an included angle of 45 degrees respectively with the two directions in real time. The plane sensor has the advantages of simple structure, small volume, low cost, high temperature resistance and high detection sensitivity, and can be used for solving the practical problem that the complex strained condition of strain between asphalt road surfaces can not be accurately and reliably detected in the prior art.
Description
Technical field
The invention belongs to bituminous pavement Research of dynamic mechanical technical field, especially relate to a kind of flat surface sensor that is used to detect the strain of bituminous pavement interlayer.
Background technology
Existing asphalt pavement design criterion all adopts the Static Design method both at home and abroad, and is serious with the mechanical behavior difference of bituminous pavement under the actual traffic load, can't explain the many early damage phenomenons that occur in the present highway communication.It is the effective way that addresses this problem that the bituminous pavement method for designing transforms to dynamic design from Static Design, also is one of at present domestic and international road circle researchist focus.Realize that the bituminous pavement method for designing is from the conversion of Static Design to dynamic design; At first should further investigate the dynamic mechanical behavior of asphalt pavement structure under the actual traffic load; The strain of bituminous pavement internal stress is its effective research means under the employing built-in type sensor detected vehicle load, also is present domestic and international research focus.But lacking dependable performance and sensor easy to use is the difficult point and the technical bottleneck of present the research.At present both at home and abroad relevant detecting sensor seldom, and existing sensor all is the one dimension sensor, only can detect the strain of a direction.And actual pavement structure presents complicated stress-strain state under vehicular load; All be to adopt the maximum stretching strain in asphalt mat bottom to estimate fatigue life of pavement in the pavement structure method for designing; Existing sensor can not directly detect the complex stress strain regime of bituminous pavement, can not directly detect the maximum stretching strain of asphalt mat bottom again.Therefore, the sensor that can detect the complicated stress-strain state of bituminous pavement interlayer of exploitation function admirable, reliable operation seems particularly necessary.
Summary of the invention
Technical matters to be solved by this invention is to above-mentioned deficiency of the prior art; A kind of flat surface sensor that is used to detect the strain of bituminous pavement interlayer 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 scheme that the present invention adopts is: a kind of flat surface sensor that is used to detect the strain of bituminous pavement interlayer; It is characterized in that: comprise one or more detecting units that respectively the interlayer dynamic strain of bituminous pavement to be detected detected in real time, the structure of a plurality of said detecting units is all identical;
Said detecting unit comprise by the elastic modulus material close with asphalt concrete modulus process and interlayer strain detecting process in can be with the flexible member of pavement asphalt compound compatible deformation to be detected, be installed in the flexible member middle part and sensitive element that dynamic strain that bituminous pavement interlayer to be detected is produced detects in real time, do not receive the asphalt infringement and can guarantee that the semisphere protective sleeve of sensitive element inspection positions asphalt compactness, the closely knit semisphere protective sleeve that is filled in are inner and the Waterproof glue line and a plurality of that sensitive element carries out waterproof and dampproof protection is fixedly mounted on the retaining element that can guarantee flexible member and pavement asphalt compound compatible deformation to be detected in the outside around the flexible member and the dynamic strain testing process and prevent the cloth set direction change of flexible member in the testing process respectively in order to the protection sensitive element; Said semisphere protective sleeve from top to bottom spiral-lock forms the cavity that a top has hole for injecting glue and base seal between said 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; Said sensitive element is the strain rosette of being made up of three foil gauges; The foil gauge two that three said foil gauges are respectively foil gauge one that the dynamic strain to vehicle heading detects in real time, detect the dynamic strain with the perpendicular vertical vehicle heading of said vehicle heading in real time and to said vehicle heading and said vertical vehicle heading between all be the foil gauge three that the dynamic strain of the vergence direction that goes of 45 ° of angles detects in real time, said vehicle heading, said vertical vehicle heading and the said vergence direction that goes are distributed on the same plane.
Above-mentioned a kind of flat surface sensor that is used to detect the strain of bituminous pavement interlayer is characterized in that: also comprise six fixed value resistance R1, R2, R 3, R4, R5 and R6; The quantity of said detecting unit is two; Two said detecting units are respectively detecting unit one and form the sensor groups that can utilize electric bridge and difference characteristic to realize temperature compensation in the dynamic strain testing process with detecting unit two and the two; Six fixed value resistance R1, R2, R3, R4, R5 and R6 respectively with two said detecting units in two strain rosettes form three alternating current bridges, and three said alternating current bridges are respectively alternating current bridge one, alternating current bridge two and alternating current bridge three; Two said detecting units all are embedded in same depth place in the bituminous pavement to be detected, and two said detecting units are laid under same the vehicle wheelmark and the spacing between the two is 60m ± 10m;
Two corresponding said foil gauges one in two said strain rosettes; Be 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 said foil gauges one and the tie point B1 between resistance R 1 and R2 connect said alternating current bridge one respectively
iThe power supply positive and negative terminal, two said 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 said alternating current bridge one
oThe positive-negative power output terminal; Two corresponding said foil gauges two in two said strain rosettes; Be 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 said foil gauges are two and the tie point B2 between resistance R 3 and R4 connect said alternating current bridge two respectively
iThe power supply positive and negative terminal, two said 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 said alternating current bridge two
oThe positive-negative power output terminal; Two corresponding said foil gauges three in two said strain rosettes; Be 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 said foil gauges are three and the tie point B3 between resistance R 5 and R6 connect said alternating current bridge three respectively
iThe power supply positive and negative terminal, two said 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 said alternating current bridge three
oThe positive-negative power output terminal.
Above-mentioned a kind of flat surface sensor that is used to detect the strain of bituminous pavement interlayer; It is characterized in that: said flexible member is served as reasons and is laid in " ten " font flexible member that two elastic rods on the same surface level are formed, and the middle part of said " ten " font flexible member is provided with the disc structure that supplies said strain rosette to install.
Above-mentioned a kind of flat surface sensor that is used to detect the strain of bituminous pavement interlayer; It is characterized in that: the quantity of said retaining element is four; The structure of four retaining elements and the respectively symmetrical both ends that are fixedly mounted on two said 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 flat surface sensor that is used to detect the strain of bituminous pavement interlayer is characterized in that: said retaining element is vertical laying between the baffle plate processed by nylon material and said baffle plate and the said elastic rod.
Above-mentioned a kind of flat surface sensor that is used to detect the strain of bituminous pavement interlayer is characterized in that: the elastic construction of said flexible member for being processed by nylon material.
Above-mentioned a kind of flat surface sensor that is used to detect the strain of bituminous pavement interlayer is characterized in that: said level has the wire hole that the lead that supply to connect sensitive element passes on round tray.
Above-mentioned a kind of flat surface sensor that is used to detect the strain of bituminous pavement interlayer is characterized in that: two said elastic rods, said levels are one to round tray and four retaining element processing and fabricatings.
Above-mentioned a kind of flat surface sensor that is used to detect the strain of bituminous pavement interlayer is characterized in that: said semisphere protective sleeve is a metal matter body, and said hole for injecting glue is laid in said metal matter body top.
Above-mentioned a kind of flat surface sensor that is used to detect the strain of bituminous pavement interlayer; It is characterized in that: side has four mounting grooves around the said semisphere protective sleeve; And the semisphere protective sleeve is fixedly mounted on two said elastic rods through four said mounting grooves, and the structure of said mounting groove is corresponding with the structure of said elastic rod; The inner chamber difference of said semisphere protective sleeve is two cavitys up and down, and wherein upper chamber is that semisphere and lower cavity are cylindrical.
The present invention 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 invention reach more than 90% up to 180 ℃.
2, highly sensitive, noise resisting ability is strong, even have only 3-5 microstrain, the present invention 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.
5, result of use is good; Lay easy for installationly, the present invention is a kind of built-in type sensor, can when road construction, be arranged in predeterminated position; Neither influence the road normal construction, can guarantee that again sensing station road surface mechanical property is consistent with other position mechanical property.
6, detect functional and stable work in work, reliable, be in particular in the following aspects: the mechanical property that 1) does not influence 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 among the present invention, 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 imbedded, and the mechanical property of sensor is 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 each assembly used in the present invention all has resistance to elevated temperatures, thereby the dynamic response that can satisfy under the condition of high temperature detects demand; 4) can detect simultaneously bituminous pavement interlayer same position along vehicle heading, vertical vehicle heading and with vehicle heading and vertical vehicle heading both direction all be 45 spend the angle directions dynamic strain; More existing unidirectional strain transducer; Test item is more comprehensive, can more in depth study the bituminous pavement dynamic mechanical behavior; 5) highly sensitive; 6) adopting two detecting units both to accomplish the temperature compensation task well, practice thrift instrument channels again, is a kind of good dynamic strain detection method.
In sum; The present invention 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.
Through accompanying drawing and embodiment, technical scheme of the present invention is done further detailed description below.
Description of drawings
Fig. 1 is the structural representation of a detecting unit of the present invention.
Fig. 2 is the A-A cut-open view of Fig. 1.
Fig. 3 is the structural representation of semisphere protective sleeve of the present invention.
Fig. 4 is the A-A cut-open view of Fig. 3.
Fig. 5 is the user mode reference diagram of flexible member of the present invention and retaining element.
Fig. 6 is the A-A cut-open view of Fig. 5.
Fig. 7 is the circuit theory diagrams of two detecting units of the present invention.
Description of reference numerals:
The 1-flexible member; The 2-retaining element; The 3-sensitive element;
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.
Embodiment
Like Fig. 1, shown in Figure 2, the present invention includes one or more detecting units that respectively the interlayer dynamic strain of bituminous pavement to be detected detected in real time, the structure of a plurality of said detecting units is all identical.In the actual use, can be according to the actual detected needs, correspondingly in bituminous pavement to be detected, lay one or more detecting units.
Said detecting unit comprise by the elastic modulus material close with asphalt concrete modulus process and interlayer strain detecting process in can be with the flexible member 1 of pavement asphalt compound compatible deformation to be detected, be installed in flexible member 1 middle part and sensitive element 3 that dynamic strain that bituminous pavement interlayer to be detected is produced detects in real time, do not receive the asphalt infringement and can guarantee that the semisphere protective sleeve 4 of sensitive element 3 inspection positions asphalt compactnesss, the closely knit semisphere protective sleeve 4 of being filled in are inner and the Waterproof glue line 5 and a plurality of that sensitive element 3 carries out waterproof and dampproof protection is fixedly mounted on the retaining element 2 that can guarantee flexible member 1 and pavement asphalt compound compatible deformation to be detected in the outside around the flexible member 1 and the dynamic strain testing process and prevent the cloth set direction change of flexible member 1 in the testing process respectively in order to protection sensitive element 3; Said 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 said 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.Said sensitive element 3 is the strain rosette of being made up of three foil gauges; The foil gauge two that three said foil gauges are respectively foil gauge one that the dynamic strain to vehicle heading detects in real time, detect the dynamic strain with the perpendicular vertical vehicle heading of said vehicle heading in real time and to said vehicle heading and said vertical vehicle heading between all be the foil gauge three that the dynamic strain of the vergence direction that goes of 45 ° of angles detects in real time, said vehicle heading, said vertical vehicle heading and the said vergence direction that goes are distributed on the same plane.
In conjunction with Fig. 7, in the present embodiment, the present invention also comprises six fixed value resistance R1, R2, R3, R4, R5 and R6; The quantity of said detecting unit is two; Two said 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 said detecting units in two strain rosettes form three alternating current bridges, and three said alternating current bridges are respectively alternating current bridge one, alternating current bridge two and alternating current bridge three; Two said detecting units all are embedded in same depth place in the bituminous pavement to be detected, and two said 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 said detecting units is 60m, can the spacing between two said detecting units be adjusted accordingly in the 60m+10m scope according to concrete detection highway section in the actual use.
Two corresponding said foil gauges one in two said strain rosettes; Be 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 said foil gauges one and the tie point B1 between resistance R 1 and R2 connect said alternating current bridge one respectively
iThe power supply positive and negative terminal, two said 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 said alternating current bridge one
oThe positive-negative power output terminal; Two corresponding said foil gauges two in two said strain rosettes; Be 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 said foil gauges are two and the tie point B2 between resistance R 3 and R4 connect said alternating current bridge two respectively
iThe power supply positive and negative terminal, two said 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 said alternating current bridge two
oThe positive-negative power output terminal; Two corresponding said foil gauges three in two said strain rosettes; Be 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 said foil gauges are three and the tie point B3 between resistance R 5 and R6 connect said alternating current bridge three respectively
iThe power supply positive and negative terminal, two said 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 said alternating current bridge three
oThe positive-negative power output terminal.
In conjunction with Fig. 5, Fig. 6; In the present embodiment; Said flexible member 1 is served as reasons and is laid in " ten " font flexible member that two elastic rods on the same surface level are formed, and the middle part of said " ten " font flexible member is provided with the level of the said strain rosette installation of confession to round tray.When the elastic construction of said flexible member 1 for processing, 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.Said level has the wire hole 8 that the lead that supply to connect sensitive element 3 passes on round tray, the wire hole of being laid 8 can prevent effectively that lead from scratching.
In the present embodiment; The quantity of said retaining element 2 is four; The structure of four retaining elements 2 and respectively symmetrical both ends that are fixedly mounted on two said elastic rods all identical with size, the upper level of four retaining elements 2 is higher than the upper level of flexible member 1.Said retaining element 2 is vertical laying between the baffle plate processed by nylon material and said baffle plate and the said 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; During actual processing and fabricating; Two said elastic rods, said levels are one and all adopt nylon material to process to round tray and four retaining element 2 processing and fabricatings, and two said elastic rods, said levels are formed a cruciform nylon sheet to round tray and four retaining element 2 processing.
In conjunction with Fig. 3, Fig. 4, said semisphere protective sleeve 4 is a metal matter body, and said hole for injecting glue 7 is laid in said metal matter body top.Side has four mounting grooves 9 around the said semisphere protective sleeve 4, and semisphere protective sleeve 4 is fixedly mounted on two said elastic rods through four said mounting grooves 9, and the structure of said mounting groove 9 is corresponding with the structure of said elastic rod.The inner chamber difference of said semisphere protective sleeve 4 is two cavitys up and down, and wherein upper chamber is that semisphere and lower cavity are cylindrical.
To sum up, in the present embodiment, a detecting unit of the present invention mainly is made up of cruciform nylon sheet, semisphere protective sleeve 4 and the strain rosette that is installed on the cross nylon sheet.Wherein, said 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 strain rosette inspection positions asphalt, can guarantee that detecting unit of the present invention 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 installation, and can prevent that semisphere protective sleeve 4 from rotating with the cruciform nylon sheet.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; Strain rosette is played waterproof action, prevent that strain rosette from receiving the water enchroachment (invasion) evil, is convenient to long-term use of the present invention.
Said cruciform nylon sheet is an elastic sensing element of the present invention; Play the effect of transmitting the road surface dynamic strain; The employing nylon material is processed; Also can adopt other elastic modulus to process less than the material of the elastic modulus of asphalt under the normal temperature slightly, said cruciform nylon sheet can effectively guarantee the present invention can with the bituminous pavement compatible deformation.Said cruciform nylon sheet is cruciform, and being laid with four baffle plates all around is retaining element 2.During actual the use, said cruciform nylon sheet is embedded in asphalt, and said cruciform nylon sheet generation corresponding deformation is forced in the distortion of asphalt, and said cruciform nylon sheet middle part is provided with level to round tray, is convenient to paste strain rosette.
Said cruciform nylon sheet middle part is laid with strain rosette; Said strain rosette is a sensitive element of the present invention; And it is made up of 3 foil gauges, and 3 foil gauges are respectively applied for detection and detect in real time with the dynamic strain that vertical vehicle heading all is 45 ° of angle directions along vehicle heading, vertical vehicle heading and with the aforementioned vehicle travel direction.
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 bituminous pavement to be detected 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 Influence of Temperature, 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 present invention uses, according to the needs of research dynamic response of asphalt pavement, with being 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 asphalt pavement structure to be detected; 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 is 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 invention; Be not that the present invention is done any restriction, every technical spirit changes any simple modification, change and the equivalent structure that above embodiment did according to the present invention, all still belongs in the protection domain of technical scheme of the present invention.
Claims (10)
1. flat surface sensor that is used to detect the strain of bituminous pavement interlayer is characterized in that: comprise one or more detecting units that respectively the interlayer dynamic strain of bituminous pavement to be detected detected in real time, the structure of a plurality of said detecting units is all identical;
Said detecting unit comprise by the elastic modulus material close with asphalt concrete modulus process and interlayer strain detecting process in can be with the flexible member (1) of pavement asphalt compound compatible deformation to be detected, be installed in flexible member (1) middle part and sensitive element (3) that dynamic strain that bituminous pavement interlayer to be detected is produced detects in real time, do not receive the asphalt infringement and can guarantee that the semisphere protective sleeve (4) of sensitive element (3) inspection positions asphalt compactness, the closely knit inner and Waterproof glue line (5) that sensitive element (3) carried out waterproof and dampproof protection of semisphere protective sleeve (4) that is filled in are fixedly mounted on the retaining element (2) that flexible member (1) can guarantee flexible member (1) and pavement asphalt compound compatible deformation to be detected in the outside and the dynamic strain testing process all around and prevent the cloth set direction change of flexible member in the testing process (1) respectively with a plurality of in order to protection sensitive element (3); Said 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 said semisphere protective sleeve (4) and the flexible member (1); Said sensitive element (3) is the strain rosette of being made up of three foil gauges; The foil gauge two that three said foil gauges are respectively foil gauge one that the dynamic strain to vehicle heading detects in real time, detect the dynamic strain with the perpendicular vertical vehicle heading of said vehicle heading in real time and to said vehicle heading and said vertical vehicle heading between all be the foil gauge three that the dynamic strain of the vergence direction that goes of 45 ° of angles detects in real time, said vehicle heading, said vertical vehicle heading and the said vergence direction that goes are distributed on the same plane.
2. according to the described a kind of flat surface sensor that is used to detect the strain of bituminous pavement interlayer of claim 1, it is characterized in that: also comprise six fixed value resistance R1, R2, R 3, R4, R5 and R6; The quantity of said detecting unit is two; Two said 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, R 3, R4, R5 and R6 respectively with two said detecting units in two strain rosettes form three alternating current bridges, and three said alternating current bridges are respectively alternating current bridge one, alternating current bridge two and alternating current bridge three; Two said detecting units all are embedded in same depth place in the bituminous pavement to be detected, and two said detecting units are laid under same the vehicle wheelmark and the spacing between the two is 60 ± 10m;
Two corresponding said foil gauges one in two said strain rosettes; Be 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 said foil gauges one and the tie point B1 between resistance R 1 and R2 connect said alternating current bridge one respectively
iThe power supply positive and negative terminal, two said 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 said alternating current bridge one
oThe positive-negative power output terminal; Two corresponding said foil gauges two in two said strain rosettes; Be 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 said foil gauges are two and the tie point B2 between resistance R 3 and R4 connect said alternating current bridge two respectively
iThe power supply positive and negative terminal, two said 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 said alternating current bridge two
oThe positive-negative power output terminal; Two corresponding said foil gauges three in two said strain rosettes; Be 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 said foil gauges are three and the tie point B 3 between resistance R 5 and R6 connect said alternating current bridge three respectively
iThe power supply positive and negative terminal, two said 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 said alternating current bridge three
oThe positive-negative power output terminal.
3. according to claim 1 or 2 described a kind of flat surface sensors that are used to detect the strain of bituminous pavement interlayer; It is characterized in that: said flexible member (1) is served as reasons and is laid in " ten " font flexible member that two elastic rods on the same surface level are formed, and the middle part of said " ten " font flexible member is provided with the disc structure that supplies said strain rosette to install.
4. according to the described a kind of flat surface sensor that is used to detect the strain of bituminous pavement interlayer of claim 3; It is characterized in that: the quantity of said retaining element (2) is four; The structure of four retaining elements (2) and the respectively symmetrical both ends that are fixedly mounted on two said 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 flat surface sensor that is used to detect the strain of bituminous pavement interlayer of claim 4, it is characterized in that: said retaining element (2) is vertical laying between the baffle plate processed by nylon material and said baffle plate and the said elastic rod.
6. according to the described a kind of flat surface sensor that is used to detect the strain of bituminous pavement interlayer of claim 5, it is characterized in that: the elastic construction of said flexible member (1) for processing by nylon material.
7. according to the described a kind of flat surface sensor that is used to detect the strain of bituminous pavement interlayer of claim 3, it is characterized in that: have the wire hole (8) that the lead that supply to connect sensitive element (3) passes on the said disc structure.
8. according to the described a kind of flat surface sensor that is used to detect the strain of bituminous pavement interlayer of claim 4, it is characterized in that: two said elastic rods, said disc structure and four retaining elements (2) processing and fabricatings are one.
9. according to claim 1 or 2 described a kind of flat surface sensors that are used to detect the strain of bituminous pavement interlayer, it is characterized in that: said semisphere protective sleeve (4) is a metal matter body, and said hole for injecting glue (7) is laid in said metal matter body top.
10. according to the described a kind of flat surface sensor that is used to detect the strain of bituminous pavement interlayer of claim 3; It is characterized in that: side has four mounting grooves (9) around the said semisphere protective sleeve (4); And semisphere protective sleeve (4) is fixedly mounted on two said elastic rods through four said mounting grooves (9), and the structure of said mounting groove (9) is corresponding with the structure of said elastic rod; The inner chamber of said semisphere protective sleeve (4) is divided into two cavitys up and down, and wherein upper chamber is that semisphere and lower cavity are cylindrical.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010105793389A CN102095364B (en) | 2010-12-08 | 2010-12-08 | Plane sensor used for detecting strain between asphalt road surfaces |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010105793389A CN102095364B (en) | 2010-12-08 | 2010-12-08 | Plane sensor used for detecting strain between asphalt road surfaces |
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| CN102095364A CN102095364A (en) | 2011-06-15 |
| CN102095364B true CN102095364B (en) | 2012-11-07 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105571509B (en) * | 2016-02-26 | 2018-06-12 | 长安大学 | A kind of sensor for being used to detect pavement structure complex stress condition |
| 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 |
| CN106839964A (en) * | 2016-12-30 | 2017-06-13 | 北京盘天新技术有限公司 | A kind of strain-ga(u)ge transducer and its installation method |
| CN108267083A (en) * | 2017-12-28 | 2018-07-10 | 顺丰科技有限公司 | A kind of 3D cameras volume measuring method and system |
| CN112629401B (en) * | 2020-12-04 | 2022-04-01 | 山东大学 | Method for manufacturing road surface structure strain sensor and sensor |
| CN113124747B (en) * | 2021-04-21 | 2023-01-17 | 齐鲁工业大学 | Three-dimensional sensor for online safety monitoring of asphalt pavement and preparation method thereof |
| CN114199118B (en) * | 2021-12-14 | 2024-08-16 | 北京石墨烯技术研究院有限公司 | Interlayer strain sensor, interlayer strain monitoring device and monitoring system |
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| JP2003119717A (en) * | 2001-10-18 | 2003-04-23 | Mitsui Chemicals Inc | Pavement diagnosing sheet and pavement nondestruction diagnosing method |
| CN200993573Y (en) * | 2006-12-25 | 2007-12-19 | 山东大学 | Device for measuring highway surface structural strain |
| JP5363048B2 (en) * | 2008-08-20 | 2013-12-11 | Ｊｆｅスチール株式会社 | Measurement method of accumulated strain in roadbed |
| CN101464239A (en) * | 2009-01-09 | 2009-06-24 | 长安大学 | Interlayer shear strength detecting instrument for asphalt pavement |
| CN101464249B (en) * | 2009-01-09 | 2011-04-27 | 长安大学 | Interlayer tensile strength detecting instrument for asphalt pavement |
| CN201885682U (en) * | 2010-12-08 | 2011-06-29 | 长安大学 | Plane sensor for detecting strain between surface layers of asphalt road |
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