CN88212860U - Self-compensating strain sensor for concrete - Google Patents
Self-compensating strain sensor for concrete Download PDFInfo
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- CN88212860U CN88212860U CN 88212860 CN88212860U CN88212860U CN 88212860 U CN88212860 U CN 88212860U CN 88212860 CN88212860 CN 88212860 CN 88212860 U CN88212860 U CN 88212860U CN 88212860 U CN88212860 U CN 88212860U
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- flexible member
- thermal output
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Abstract
The utility model relates to a self-compensating strain sensor for concrete, which is composed of an isolating layer, a protective layer, an elastic element, etc. The elastic element is pasted with two special strain sheets which have the same resistance value and different thermal output values. The thermal output valves of the two special strain sheets are specifically matched with each other according to the self-compensating requirement of the concrete to be measured to the utility model. The utility model has the advantages of simple structure, low cost, wide application range, easy debugging, small thermal output valve when measured, small thermal output dispersion degree, accurate measurement, etc.
Description
The utility model relates to a kind of concrete self-compensating strain transducer of measuring the ess-strain situation of concrete, reinforced concrete inner structure.
At present China's sensor of being used to measure the ess-strain situation of concrete, reinforced concrete inner structure mainly contains multiple sensors such as string formula, differential type, CJP resistance-strain type, and wherein string formula, differential type concrete sensor complex structure, price height, usable range are narrow.The CJP resistance strain sensor is made up of separation layer, protective seam, flexible member etc.; symmetrical in length and breadth adhering resistance value is identical in the two sides, middle part of flexible member, and thermal output is worth each one of identical electric-resistance strain ga(u)ge, totally four; be connected into Hui Sidun half-bridge (or full-bridge) circuit, draw by lead again.The CJP resistance strain sensor is after concrete casting is solidified, and sensor is then started working, and the strain of concrete inner structure then reflects by the electric-resistance strain ga(u)ge in the CJP resistance strain type sensor.Because existing C JP type strain gauge transducer has adopted four sheet resistance values identical.The electric-resistance strain ga(u)ge that the thermal output value is identical; so cost height; debug difficulties; because flexible member, the material of protective seam and the difference of thermal expansion coefficient of concrete in the existing C JP resistance strain type sensor; make that 1. thermal output value is big; the thermal output value the highest can＞10 μ ε/℃ 2. the thermal output dispersion degree is big; can reach ± 3 μ ε/℃; even adopt special rolling-mill section or concrete self-compensating strain sheet also can't change this defect, this just causes under the bigger situation of temperature variation, and measuring error is big, usable range is restricted.
The purpose of this utility model be for design a kind of simple in structure, cost is low, usable range is wide, debugging is easy, the thermal output value is little when measuring, the thermal output dispersion degree is little, measure accurate concrete self-compensating strain transducer.
The utility model is achieved like this: the utility model is by separation layer; protective seam; the flexible member that is loaded in the protective seam is formed (referring to Fig. 1); it is the twice of flexible member width that one wire grid width is arranged in the utility model; and tear commentaries on classics open from the centre of wire grid width; it 1/2nd is attached on the side of flexible member; in addition 1/2nd be attached to vertical working strain gauge on the another side of flexible member (referring to Fig. 3; Fig. 5; Fig. 6); it is the twice of flexible member width that one wire grid length is arranged in the utility model; and tear commentaries on classics open from the wire grid mid-length; it 1/2nd is attached on the side of flexible member; 1/2nd be attached on the another side of flexible member in addition; identical with vertical working strain gauge resistance value and thermal output is worth discrepant horizontal dummy gauge (referring to Fig. 3; Fig. 6; Fig. 8); connect vertical working strain gauge and horizontal dummy gauge (referring to Figure 10) with lead; fixing agent will be drawn lead fixed on flexible member (referring to Fig. 1); because the utility model has adopted two special sheet resistance values identical and thermal output is worth discrepant foil gauge; guaranteed precision; sensitivity; the thermal output value of these two foil gauges then requires self compensation of the present utility model according to detected concrete and special development coupling; the utility model debugging easily; the thermal output value is reduced; realize self compensation, the strain transducer of different concrete linear expansion coefficients can be provided as required.
The material of making fixing agent in the utility model is consistent with the material of making protective seam, and the thermal output dispersion degree is reduced.
The utlity model has simple in structure, advantages such as cost is low, applied range, debugging is easy, the thermal output value is little when measuring, the thermal output dispersion degree is little, measurement is accurate.The utility model can be decreased to the thermal output value≤± 1～2 μ ε/℃, the thermal output dispersion degree is decreased to ± 1 μ ε/℃, can realize self compensation, thereby the short form test method improves the quality and the efficient of test and data processing.The utility model not only can be used for basis, hypogee, roadway equitemperature to be changed in little concrete, the reinforced concrete structures and measures stress, also can carry out short-term, long-term ess-strain observation, power strain observation to structures such as bridge, bridge pier, road face, dam, harbour, chimney and other skyscrapers.
Describe embodiment of the present utility model in detail below in conjunction with accompanying drawing:
Fig. 1: the utility model structural representation
Fig. 2: the utility model circuit theory diagrams
Fig. 3: flexible member and foil gauge position concern synoptic diagram
The vertical view of Fig. 4: Fig. 3
Fig. 5: D-D profile among Fig. 3
Fig. 6: flexible member and foil gauge position concern synoptic diagram
The vertical view of Fig. 7: Fig. 6
Fig. 8: E-E profile among Fig. 6
Fig. 9: F-F profile among Fig. 6
Figure 10: foil gauge wiring schematic diagram
Each sequence number explanation among the above figure:
1 separation layer, 2 protective seams, 3 flexible members, 4 sides, 5 sides, 6 vertical working strain gauges, 7 horizontal dummy gauges, 8 draw lead, 9 fixing agents
More than among each figure A, B, C represent to draw terminal.
The utility model is made up of separation layer 1, protective seam 2, flexible member 3.Flexible member 3 adopts 0.2 millimeter stainless steel substrates, it is the twice of the width of flexible member 3 that one wire grid width is arranged on flexible member 3, and tear commentaries on classics open from the centre of wire grid width, it 1/2nd is attached on the side 4 of flexible member 3, / 2nd vertical working strain gauges 6 that are attached on the another side 5 of flexible member 3 in addition, it is the twice of the width of flexible member 3 that wire grid length is arranged on flexible member 3, and tear commentaries on classics open from the centre of wire grid length, it 1/2nd is attached on the side 4 of flexible member 3,1/2nd be attached on the another side 5 of flexible member 3 in addition, identical with vertical working strain gauge 6 resistance values and thermal output is worth discrepant horizontal dummy gauge 7(referring to Fig. 1, Fig. 3, Fig. 6), draw lead 8 with vertical working strain gauge 6, laterally dummy gauge 7 connects, and fixing agent 9 will be drawn lead 8 and is fixed on the flexible member 3.Protective seam 2 and fixing agent 9 all are to adopt epoxy type reinforced plastic to make, and vertical working strain gauge 6 and horizontal dummy gauge 7 are to adopt card sign indicating number alloy silk (or constantan wire) to make, and separation layer 1 is to adopt the friction tape replacement.
The process that the utility model is made is: after sticking vertical working strain gauge 6 and horizontal dummy gauge 7 on the flexible member 3; with drawing lead 8 foil gauge 6, foil gauge 7 are connected into the Hui Sidun half-bridge; fixing agent 9 will all be drawn lead 8 and will be fixed on the flexible member 3; then flexible member 3 is placed pressure injection epoxy type reinforced plastic in the particular manufacturing craft and form protective seam 2; one section twines and forms separation layer 1 with friction tape in the centre in protective seam 2 outsides; commentaries on classics is torn at four angles of the flexible member 3 that will stretch out again open, and the utility model has just been made.
The utility model is fixed on the assigned position for the treatment of geodesic structure on request before concrete casting, concrete casting, solidify after the utility model start working, the strain of concrete inner structure then reflects by the foil gauge in the utility model.
Claims (2)
1, a kind of concrete self-compensating strain transducer comprises separation layer (1), protective seam (2), flexible member (3), it is characterized in that on the described concrete self-compensating strain transducer:
1. one wire grid width is arranged is the twice of the width of flexible member (3), and tear commentaries on classics open from the centre of wire grid width, it 1/2nd is attached on the side (4) of flexible member (3), in addition 1/2nd vertical working strain gauges (6) that are attached on the another side (5) of flexible member (3)
2. one wire grid length arranged is the twice of the width of flexible member (3), and tear commentaries on classics open from the centre of wire grid length, it 1/2nd is attached on the side (4) of flexible member (3), in addition 1/2nd to be attached to the resistance value with vertical working strain gauge (6) on the another side (5) of flexible member (3) identical and thermal output is worth discrepant horizontal dummy gauge (7)
3. have the vertical working strain gauge of connection (6), laterally the lead (8) of drawing of dummy gauge (7) is fixed on fixing agent (9) on the flexible member (3).
2, concrete self-compensating strain transducer as claimed in claim 1, the material that it is characterized in that making in the described concrete self-compensating strain transducer fixing agent (9) is consistent with the material of making protective seam (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88212860 CN88212860U (en) | 1988-04-13 | 1988-04-13 | Self-compensating strain sensor for concrete |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88212860 CN88212860U (en) | 1988-04-13 | 1988-04-13 | Self-compensating strain sensor for concrete |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN88212860U true CN88212860U (en) | 1988-11-30 |
Family
ID=4846115
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 88212860 Expired - Lifetime CN88212860U (en) | 1988-04-13 | 1988-04-13 | Self-compensating strain sensor for concrete |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN88212860U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103954385A (en) * | 2014-04-30 | 2014-07-30 | 李恒 | Wireless passive rfid stress sensor |
| CN109682511A (en) * | 2019-01-15 | 2019-04-26 | 河海大学 | A kind of device and method using steel fiber reinforced concrete aggregate measurement extruding force |
| CN117433406A (en) * | 2023-12-20 | 2024-01-23 | 济南大学 | Bridge pier online safety monitoring sensing device, manufacturing method and using method |
-
1988
- 1988-04-13 CN CN 88212860 patent/CN88212860U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103954385A (en) * | 2014-04-30 | 2014-07-30 | 李恒 | Wireless passive rfid stress sensor |
| CN109682511A (en) * | 2019-01-15 | 2019-04-26 | 河海大学 | A kind of device and method using steel fiber reinforced concrete aggregate measurement extruding force |
| CN117433406A (en) * | 2023-12-20 | 2024-01-23 | 济南大学 | Bridge pier online safety monitoring sensing device, manufacturing method and using method |
| CN117433406B (en) * | 2023-12-20 | 2024-04-02 | 济南大学 | Bridge pier online safety monitoring sensing device, manufacturing method and using method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |