CN101713765A - Piezoelectric spectral sensor - Google Patents
Piezoelectric spectral sensor Download PDFInfo
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- CN101713765A CN101713765A CN200910308321A CN200910308321A CN101713765A CN 101713765 A CN101713765 A CN 101713765A CN 200910308321 A CN200910308321 A CN 200910308321A CN 200910308321 A CN200910308321 A CN 200910308321A CN 101713765 A CN101713765 A CN 101713765A
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- piezoelectric
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- plunger shaft
- spectral sensor
- pavement
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Abstract
The invention relates to a technique for detecting the quality of a roadbed and a road surface, in particular to a piezoelectric spectral sensor for detecting an expressway roadbed. The piezoelectric spectral sensor is characterized by comprising a base body, an upper shell, a piston rod, a piston, a silastic sealing ring, a piezoelectric film, a silastic and a piston chamber, wherein the bottom surface of the piston chamber is connected with the flat base body into a whole by a screw; the piston rod is fixed with the inner top surface of the upper shell into a whole; the piston extends into the piston chamber; the opening of the piston chamber extends outwards; the lower opening of the upper shell extends inwards; the outwards-extending part of the piston chamber and the inwards-extending part of the upper shell form an inversely-suspending structure, which is sealed by the silastic sealing ring; and the silastic is provided with the piezoelectric film. The piezoelectric spectral sensor is applied to detecting the quality of roadbeds and road surfaces with different structures.
Description
Technical field
The present invention relates to a kind of subgrade and pavement quality detection technology, particularly express highway roadbed detection piezoelectric spectral sensor.
Background technology
Subgrade and pavement detects the detection that is actually roadbed, pavement compaction quality, roadbed, pavement compaction quality are one of most important inherent indexs of highway engineering construction quality management, have only roadbed, road surface structare layer are carried out abundant compacting, the flatness on intensity, rigidity and the road surface on roadbed, road surface could be guaranteed, and the serviceable life of roadbed, pavement engineering can be guaranteed and prolong.
The existing a kind of method of the detection of pavement compaction quality is a sand replacement method, and sand replacement method utilizes the sand of single-size to remove to replace the volume in examination hole, and it is current method in common, and a lot of engineerings are all classified sand replacement method as the main method of on-site measurement density.This method can be used for testing the density of various soil or ground surface material, and its shortcoming is: need carry the sand of more amount, and the weighing number of times is more, so its test speed is slower.
The existing another kind of method of the detection of pavement compaction quality is a core cutter method, and core cutter method is the classic method of measure field density.The cutting ring volume that domestic custom adopts is generally 200cm
3, the about usually 5cm of cutting ring height.The density that records with core cutter method is the average density in the depth range of soil sample place in the cutting ring, and it can not represent the average density of whole rolling layers.Because rolling the density of soil layer generally reduces from top to bottom, if cutting ring is taken at the top of rolling layers, the numerical value that then obtains is often bigger than normal, if what cutting ring was got is the bottom of rolling layers, then the numerical value of gained will be obviously less than normal, with regard to the compactness of checking subgrade soils and road surface structare layer, what we needed is the mean pressure solidity of whole rolling layers, rather than certain a part of compactness in the rolling layers, therefore, when measuring the density of soil, should make gained density can represent the average density of whole rolling layers with core cutter method.Yet this is the comparison difficulty in actual detected; The soil that cutting ring is got is the soil in the middle of the rolling layers just, and the result of core cutter method gained just may be roughly the same with the result of sand replacement method.In addition, the core cutter method applicable surface is narrower, can't use for Stabilized Soil that contains pellet and laxity material.
Yet, reach detection subgrade and pavement quality by detecting the pavement compaction degree, this can not say something in some cases, subgrade and pavement compactness as water absorptivity subgrade and pavement compactness and common high-grade highway is also inequality, the latter is owing to the change of material, and its performance is extraordinary, but it at first answers the outstanding water absorptivity of tool affair, if and with the pavement compaction degree as standard, then be difficult to reach the subgrade and pavement compactness of common high-grade highway.
Summary of the invention
The purpose of this invention is to provide a kind of piezoelectric spectral sensor, so that be fit to the subgrade and pavement quality testing of different structure.
Technical scheme of the present invention is achieved in that piezoelectric spectral sensor, it is characterized in that: it comprises pedestal a, upper casing b, piston rod c, piston d, silicone rubber O-ring e, piezoelectric membrane m, silicon rubber n and plunger shaft h; Plunger shaft h bottom surface and flat pedestal a connect as one by screw; The shell inner top surface of piston rod c and upper casing b is fixed as one; Piston d puts in the plunger shaft h, and plunger shaft h opening is protruding, and upper casing b under shed inwardly puts in, and the protruding position of plunger shaft h and upper casing b inwardly put in the position and form the reversal of the natural order of things structure, between by silicone rubber O-ring e sealing, piezoelectric membrane m is arranged on the silicon rubber n.
Characteristics of the present invention are: owing to adopt the piezoelectric transducer of piston cylinder operator, when travelling load is passed through, the vibration wave that produces acts on the pedestal a, further act on plunger shaft h bottom surface by pedestal a, make silicon rubber n vibration in the plunger shaft h, vibration can make piezoelectric membrane m fluctuate thereupon, and piezoelectric membrane m produces piezoelectric signal, piezoelectric signal is consistent with vibration wave, therefore can reach the purpose of understanding subgrade and pavement by the spectrum distribution of analyzing piezoelectric signal.
Description of drawings
The invention will be further described below in conjunction with the embodiment accompanying drawing.
Fig. 1 is the structural representation of the embodiment of the invention.
Embodiment
As shown in Figure 1, it comprises pedestal a, upper casing b, piston rod c, piston d, silicone rubber O-ring e, piezoelectric membrane m, silicon rubber n and plunger shaft h.Plunger shaft h bottom surface and flat pedestal a connect as one by screw.The shell inner top surface of piston rod c and upper casing b is fixed as one; Piston d puts in the plunger shaft h, and plunger shaft h opening is protruding, and upper casing b under shed inwardly puts in, and the protruding position of plunger shaft h and upper casing b inwardly put in the position and form the reversal of the natural order of things structure, between by silicone rubber O-ring e sealing, piezoelectric membrane m is arranged on the silicon rubber n.
When travelling load was passed through, the vibration wave of generation acted on the pedestal a, further acts on plunger shaft h bottom surface by pedestal a, make silicon rubber n vibration in the plunger shaft h, vibration can make piezoelectric membrane m fluctuate thereupon, and piezoelectric membrane m produces piezoelectric signal, and piezoelectric signal is consistent with vibration wave.
The present invention is at first by placing the pick-up unit of subgrade and pavement in the standard roadbed, the travelling load of the utilization standard (vehicle weight that knows, engine model, Vehicle Speed) sets up a benchmark frequency spectrum from certain distance by the pick-up unit of placing subgrade and pavement in the standard roadbed, and then the travelling load of passing through standard is passed through unknown subgrade and pavement, be implanted with the pick-up unit of the subgrade and pavement under the standard subgrade and pavement under this subgrade and pavement, when passing through by the travelling load of measurement standard, the vibration signal of the vibration transducer of subgrade and pavement pick-up unit carries out spectrum analysis, be fine as the road of consistent survey explanation roadbed with the frequency spectrum of standard homogenous quantities, otherwise then defective in quality.The method that this detection gimmick and background technology provide has the difference of essence, and one can detect whenever and wherever possible, and detection speed is fast.Set up powerful analytic system easily and provide means for the quality transformation of subgrade and pavement.
Claims (1)
1. piezoelectric spectral sensor, it is characterized in that: it comprises pedestal a, upper casing b, piston rod c, piston d, silicone rubber O-ring e, piezoelectric membrane m, silicon rubber n and plunger shaft h; Plunger shaft h bottom surface and flat pedestal a connect as one by screw; The shell inner top surface of piston rod c and upper casing b is fixed as one; Piston d puts in the plunger shaft h, and plunger shaft h opening is protruding, and upper casing b under shed inwardly puts in, and the protruding position of plunger shaft h and upper casing b inwardly put in the position and form the reversal of the natural order of things structure, between by silicone rubber O-ring e sealing, piezoelectric membrane m is arranged on the silicon rubber n.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910308321A CN101713765A (en) | 2009-10-15 | 2009-10-15 | Piezoelectric spectral sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910308321A CN101713765A (en) | 2009-10-15 | 2009-10-15 | Piezoelectric spectral sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101713765A true CN101713765A (en) | 2010-05-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910308321A Pending CN101713765A (en) | 2009-10-15 | 2009-10-15 | Piezoelectric spectral sensor |
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| CN (1) | CN101713765A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102944607A (en) * | 2012-10-26 | 2013-02-27 | 朱德兵 | Rolling type movement transverse wave sensor and use method thereof |
-
2009
- 2009-10-15 CN CN200910308321A patent/CN101713765A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102944607A (en) * | 2012-10-26 | 2013-02-27 | 朱德兵 | Rolling type movement transverse wave sensor and use method thereof |
| CN102944607B (en) * | 2012-10-26 | 2014-11-19 | 朱德兵 | Rolling type movement transverse wave sensor and use method thereof |
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Application publication date: 20100526 |