CN206440719U - The measuring system of Non-load Concrete internal stress in concrete structure - Google Patents
The measuring system of Non-load Concrete internal stress in concrete structure Download PDFInfo
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- CN206440719U CN206440719U CN201720097205.5U CN201720097205U CN206440719U CN 206440719 U CN206440719 U CN 206440719U CN 201720097205 U CN201720097205 U CN 201720097205U CN 206440719 U CN206440719 U CN 206440719U
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Abstract
A kind of measuring system of Non-load Concrete internal stress in concrete structure, the system includes metal derby sensor, temperature compensation block, temperature sensor, temperature heater box and strain testing instrument；Metal derby sensor is embedded among concrete to be measured with temperature sensor, and temperature compensation block is positioned among temperature heater box and outside concrete to be measured；Metal derby sensor includes the test block of metallic monolith, and at least three orthogonal foil gauges are pasted with the test block；Temperature compensation block includes the compensation block of metallic monolith, and a temperature strain piece is pasted with the compensation block；Each foil gauge is linked on strain testing instrument with temperature strain piece in 1/4 bridge joint mode；The test block is close with concrete with the Poisson's ratio and linear expansion coefficient of compensation block；The temperature sensor connects temperature heater box.The utility model can solve the influence of the change of concrete early-age concrete internal temperature and different rebar ratios to concrete internal stress, and measuring accuracy is higher.
Description
Technical field
The utility model is related to technical field of civil engineering, Non-load Concrete internal stress in espespecially a kind of concrete structure
Measuring system.
Background technology
The mechanical performance index development of concrete age morning is very fast in concrete structure, and concrete is turned by mecystasis
Turn to solid-state, although concrete structure does not undertake the load of design now, but the problem of Cracking of concrete early age is frequent
Perplex the quality of coagulation project.Concrete morning age when non-load stress include temperature stress and shrinkage stress, both should
The development of power is the main cause of concrete bracing.Due to the Creep Characteristics of concrete be difficult in early age it is accurate really
It is fixed, therefore can not determine to mix in the internal stress of concrete, general concrete structure by determining the deformation of concrete early age
Temperature environment constraint different and reinforcing bar from the external world residing for solidifying soil etc., it is difficult to accurately obtain concrete by theoretical calculation method
Internal stress, the internal stress numerical value of early age also lacks measuring in the concrete that existing finite element method is calculated
Data are confirmed.
The engineering of inside concrete stress state, the large-sized concrete such as dam, skyscraper are monitored the need for existing
Structure, the change of the early age internal stress of monitoring concrete structure can provide data for the safety and stability evaluation of structure.At present most
Conventional method is that sensor is embedded in concrete, and corresponding stress is obtained by output of the sensor under stress
Value.But sensor matching situation also to embedment when sensor combination degree, concrete moisture content, environment temperature etc. it is related, and
Partial parameters in economics analysis need to measure in specific experiment, so as to increase the difficulty of matching error calculating.Shi Zhen is bright et al.
The stress that a kind of vibratory stress gauge measures concrete is applied, but its measured value is compared less than normal with actual value.Fibre optical sensor
Start to be applied to the measurement that inside concrete is strained as a kind of novel sensor, but need to solve to be accurately positioned what is buried and protect
Problem, creeps the interference determined to internal stress while not solving concrete early age.
Relative to temperature-compensating, Li little Mao et al. researchs《The strain brick Sensor Design of concrete internal stress measuring with
Using》In, temperature and interference compensation piece are provided with the sensor, temperature and mushing error can be compensated.
CN201110436857.4 discloses a kind of " test of early-age concrete cracking resistance under different temperatures and humidity atmosphere
Device and measuring method ", temperature-compensating plate is also equipped with the patent application.However, in above-mentioned technology, temperature-compensating plate is
Be embedded in concrete, in addition to temperature interference, inevitably also exist stress etc. other interference, therefore compensation error compared with
Greatly.
In addition, prior art can not solve influence of the different rebar ratios to concrete internal stress.
Utility model content
Internal stress under non-loading cracks when technical problem to be solved in the utility model is to determine concrete early age
The measuring system of size, solves the influence of concrete creep during internal stress during quantitative analysis concrete early age, directly determines
The internal stress of concrete age morning, reduces the early-age cracking of concrete.The system of this measure can solve concrete early age
Concrete internal temperature changes the influence to concrete internal stress with different rebar ratios, and measuring accuracy is higher.
In order to solve the above technical problems, technical solution of the present utility model is：
The measuring system of Non-load Concrete internal stress in a kind of concrete structure, including metal derby sensor, temperature are mended
Repay block, temperature sensor, temperature heater box and strain testing instrument；Described metal derby sensor is embedded in temperature sensor
Among concrete to be measured, described temperature compensation block is positioned among temperature heater box and outside concrete to be measured；It is described
Metal derby sensor include being pasted with least three orthogonal strains on the block test block that is made of metal, the test block
Piece；Described temperature compensation block includes being pasted with a temperature strain piece on the block compensation block that metal is made, the compensation block；Institute
Each foil gauge is stated to be linked into 1/4 bridge joint mode with temperature strain piece on described strain testing instrument；Described test block and institute
The Poisson's ratio and linear expansion coefficient of the material for the compensation block stated are close with concrete；Described temperature sensor connection temperature heating
Case.
Preferably, described test block or described compensation block are cube or cuboid.
Preferably, described test block and described compensation block are cube, and both sizes are not more than the mm of size 20
×20 mm×20mm。
Preferably, the material of the test block or the compensation block is using No. 45 carbon constructional quality steels.
Preferably, three orthogonal foil gauges on the metal derby sensor are separately positioned on the test block
On three orthogonal faces.
Preferably, two orthogonal strains are each provided with wherein three orthogonal faces of the test block
Piece, totally 6 foil gauges.
Preferably, two orthogonal foil gauges are each provided with six faces of the test block, totally 12 foil gauges.
Preferably, described compensation block is block-shaped identical with material with described test.
Preferably, each foil gauge of the metal derby sensor selects Metal Substrate foil gauge, and it uses waterproof glue to be glued
Patch, and in foil gauge surface silica gel waterproof sealing.
After such scheme, the utility model has the advantages that：
1. the utility model has designed and produced a kind of flush type metal derby sensor, the test bulk of the metal derby sensor
The Poisson's ratio and linear expansion coefficient of matter are close with concrete, therefore the deformation of the test block is suitable with concrete, according to newton
Three law active forces and reaction force are equal in magnitude, directly determine the active force suffered by metal derby sensor, it becomes possible to anti-
The size and changing rule of the three-dimensional internal stress of concrete should be gone out, and measurement result is directly relevant with the test point placed, even if
Be provided with different rebar ratios, can also more real reaction test point internal stress, measuring accuracy is higher.
2. the utility model is provided with a temperature strain piece, and the temperature compensated metal block being placed in outside concrete to be measured
On；The temperature of inside concrete is different due to the position in concrete, the lost difference of heat on surface, using synchronous embedment
Temperature sensor, realizes the temperature of real-time measuring point, while using temperature heater box, make environment temperature residing for temperature compensation block with
The temperature environment of inside concrete tested point is consistent；So the deformation of temperature strain piece can reaction temperature to the shadow of internal stress
Ring, so as to effectively eliminate influence of the temperature to strain measurement.
Brief description of the drawings
Fig. 1 is the structural representation of measuring system described in the utility model；
Fig. 2 is the structural representation of metal derby sensor described in the utility model；
Fig. 3 is the structural representation of temperature compensation block described in the utility model；
Fig. 4 is test electric bridge schematic diagram described in the utility model；
Fig. 5 is test philosophy figure described in the utility model.
Embodiment
The utility model is described in further detail with specific embodiment below in conjunction with the accompanying drawings.
Disclosed in the utility model is a kind of measuring system of Non-load Concrete internal stress in concrete structure, is such as schemed
It is preferred embodiment of the present utility model shown in 1.Described measuring system includes metal derby sensor 1, temperature compensation block 2, temperature
Spend sensor 3, temperature heater box 4 and strain testing instrument 5.Wherein：
Described metal derby sensor 1（As shown in Figure 2）The cube test block 11 being made including metal, test block 11
Size it is smaller measurement it is more accurate, but it is undersized be unfavorable for set foil gauge, be also inconvenient to use；Optimal, the test block
The 11 no more than mm of size 20 × 20 mm × 20mm, its surfacing, surface roughness no requirement (NR)；In addition, the test block 11
Material can be using No. 45 carbon constructional quality steels, the Poisson's ratio and linear expansion coefficient of the material are close with concrete, also may be used
To use other materials close with linear expansion coefficient with the Poisson's ratio of concrete.Three are at least pasted with the test block 11 should
Become piece 12, the direction of three foil gauges 12 is mutually perpendicular to, the stress to test three directions of x, y, z；Three foil gauges 12
It can be separately positioned on three orthogonal faces of test block 11.It is mutual in test block 11 wherein three in the present embodiment
Two orthogonal foil gauges 12 are each provided with vertical face, totally 6 foil gauges 12, therefore the foil gauge in each direction has
Two.Respectively two foil gauges arranged perpendicularly can also be set on six faces of test block, 12 foil gauges are set altogether,
There are four foil gauges in so each direction, and measurement result averages to increase measurement accuracy.Described foil gauge 12 can be selected
With high-precision Metal Substrate foil gauge, pasted using waterproof glue, and in foil gauge surface silica gel waterproof sealing.The metal
Block sensor 1 is embedded in concrete 6 to be measured when in use.
Described temperature compensation block 2（As shown in Figure 3）The cube compensation block 21 being made including metal and a stickup
Temperature strain piece 22 on the compensation block 21.The material or size of the compensation block 21 can be identical with described test block 11.
The temperature compensation block 2 is placed in described temperature heater box 4, and temperature heater box 4 is located at outside concrete 6 to be measured.
Described temperature sensor 3 can use RTD formula temperature sensor, and concrete 6 to be measured is embedded in when it is used
It is interior, positioned at the side of the metal derby sensor 1, to measure the temperature in concrete, the temperature according to the temperature control
Heater box 4 is spent, makes the temperature residing for the temperature sensor 3 identical with inside concrete, the compensation of temperature influence is realized.
Described strain testing instrument 5 should with each foil gauge 12 of the metal derby sensor 1 and the temperature of temperature compensation block 2
Become piece 22 to be connected, and bridged using 1/4 into foil gauge（As shown in Figure 4,5）, i.e., 6 access of foil gauges 12 R1, a temperature should
Become the access of piece 22 R2.
Principle of the present utility model is：By being embedded to a Poisson's ratio and linear expansion coefficient and coagulation in concrete to be measured
The close metal of soil surveys block block, equal in magnitude according to Newton's third law active force and reaction force, directly determines metal derby
Active force suffered by sensor, it becomes possible to the size and changing rule of the three-dimensional internal stress of concrete are reflected, so that truer
Reaction test point internal stress, measuring accuracy is higher.The utility model is further through one temperature of setting outside concrete to be measured
Compensation block is spent, the environment temperature residing for the temperature compensation block is realized and coagulation by the temperature sensor being embedded in concrete to be measured
Soil is identical, therefore can realize the compensation to temperature.Because the temperature compensation block is disposed on outside concrete to be measured, therefore not
Disturbed by other factors.
It is described above, only it is preferred embodiment of the present utility model, not technical scope of the present utility model is made
Any limitation, therefore the change or modification done in every case according to claim of the present utility model and specification, should all belong to this practicality
Within the scope of new patent is covered.
Claims (9)
1. the measuring system of Non-load Concrete internal stress in a kind of concrete structure, it is characterised in that：Including metal derby sensing
Device（1）, temperature compensation block（2）, temperature sensor（3）, temperature heater box（4）And strain testing instrument（5）；Described metal derby
Sensor is embedded in concrete to be measured with temperature sensor（6）Among, described temperature compensation block be positioned over temperature heater box it
In and outside the concrete to be measured；Described metal derby sensor（1）The block test block being made including metal（11）, the survey
At least three orthogonal foil gauges are pasted with test block（12）；Described temperature compensation block（2）The block being made including metal
Shape compensation block（21）, a temperature strain piece is pasted with the compensation block（22）；Each foil gauge（12）With temperature strain piece
（22）Described strain testing instrument is linked into 1/4 bridge joint mode（5）On；Described test block（11）With described compensation block
（21）Material Poisson's ratio and linear expansion coefficient it is close with concrete；Described temperature sensor（3）Connect temperature heater box
（4）.
2. the measuring system of Non-load Concrete internal stress in concrete structure according to claim 1, it is characterised in that：
Described test block（11）Or described compensation block（21）For cube or cuboid.
3. the measuring system of Non-load Concrete internal stress in concrete structure according to claim 1, it is characterised in that：
Described test block（11）With described compensation block（21）It is cube, and both sizes are not more than the mm of the mm of size 20 × 20
×20mm。
4. the measuring system of Non-load Concrete internal stress in concrete structure according to claim 1, it is characterised in that：
The test block（11）Or the compensation block（21）Material using No. 45 carbon constructional quality steels.
5. the measuring system of Non-load Concrete internal stress in the concrete structure according to Claims 2 or 3, its feature exists
In：The metal derby sensor（1）On three orthogonal foil gauges（12）It is separately positioned on the test block（11）'s
On three orthogonal faces.
6. the measuring system of Non-load Concrete internal stress in the concrete structure according to Claims 2 or 3, its feature exists
In：The test block（11）Wherein three orthogonal faces on be each provided with two orthogonal foil gauges（12）, totally 6
Individual foil gauge.
7. the measuring system of Non-load Concrete internal stress in the concrete structure according to Claims 2 or 3, its feature exists
In：The test block（11）Six faces on be each provided with two orthogonal foil gauges（12）, totally 12 foil gauges.
8. according to the measuring system of Non-load Concrete internal stress in any described concrete structures of claim 1-4, it is special
Levy and be：Described compensation block（21）With described test block（11）Shape is identical with material.
9. according to the measuring system of Non-load Concrete internal stress in any described concrete structures of claim 1-4, it is special
Levy and be：The metal derby sensor（1）Each foil gauge（12）From Metal Substrate foil gauge, it uses waterproof glue to be glued
Patch, and in foil gauge surface silica gel waterproof sealing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720097205.5U CN206440719U (en) | 2017-01-25 | 2017-01-25 | The measuring system of Non-load Concrete internal stress in concrete structure |
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|---|---|---|---|
| CN201720097205.5U CN206440719U (en) | 2017-01-25 | 2017-01-25 | The measuring system of Non-load Concrete internal stress in concrete structure |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108614913A (en) * | 2018-03-26 | 2018-10-02 | 中国水利水电科学研究院 | The computational methods and device of the concrete unit ratio of reinforcement |
| CN108931326A (en) * | 2018-08-16 | 2018-12-04 | 福州大学 | A kind of strain gauge transducer and working method measuring soil pressure |
-
2017
- 2017-01-25 CN CN201720097205.5U patent/CN206440719U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108614913A (en) * | 2018-03-26 | 2018-10-02 | 中国水利水电科学研究院 | The computational methods and device of the concrete unit ratio of reinforcement |
| CN108931326A (en) * | 2018-08-16 | 2018-12-04 | 福州大学 | A kind of strain gauge transducer and working method measuring soil pressure |
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