CN104864990B - Concrete absolute stress measurement device and method - Google Patents
Concrete absolute stress measurement device and method Download PDFInfo
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- CN104864990B CN104864990B CN201510342273.9A CN201510342273A CN104864990B CN 104864990 B CN104864990 B CN 104864990B CN 201510342273 A CN201510342273 A CN 201510342273A CN 104864990 B CN104864990 B CN 104864990B
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- stainless steel
- steel tube
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- concrete
- ultrasound wave
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- 239000004567 concrete Substances 0.000 title claims abstract description 48
- 238000005259 measurement Methods 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 title claims abstract description 12
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 61
- 239000010935 stainless steel Substances 0.000 claims abstract description 61
- 239000000523 sample Substances 0.000 claims abstract description 12
- 238000002604 ultrasonography Methods 0.000 claims description 29
- 239000000463 material Substances 0.000 claims description 13
- 238000005266 casting Methods 0.000 claims description 7
- 238000001514 detection method Methods 0.000 claims description 6
- 230000003014 reinforcing effect Effects 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 230000000644 propagated effect Effects 0.000 claims description 3
- 230000001902 propagating effect Effects 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 239000002689 soil Substances 0.000 description 4
- 230000015271 coagulation Effects 0.000 description 2
- 238000005345 coagulation Methods 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 239000004570 mortar (masonry) Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000004568 cement Substances 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000004441 surface measurement Methods 0.000 description 1
- 210000001260 vocal cord Anatomy 0.000 description 1
Landscapes
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention provides a concrete absolute stress measurement device and method. The concrete absolute stress measurement device comprises a first stainless steel tube and a second stainless steel tube, wherein an end opening A and an end opening B of the first stainless steel tube are both openings, the second stainless steel tube is vertically arranged on the side surface, close to the end opening B, of the first stainless steel tube, an end opening C of the second stainless steel tube is an opening and communicated with the first stainless steel tube, and an end opening D of the second stainless steel tube is sealed; a first ultrasonic receiving probe is arranged in the first stainless steel tube and close to the end opening A, and an ultrasonic transmitting probe is arranged above the end opening C; a second ultrasonic receiving probe is arranged in the second stainless steel tube and close to the end opening D. Through the method, the internal real stress state of a concrete structure can be accurately and integrally measured, the measurement operation is simple and quickly, and nondestructive measurement can be realized. The concrete absolute stress measurement device is simple in structure, low in manufacturing cost, high in practicability and simple and convenient to use.
Description
Technical field
The present invention relates to concrete stress fields of measurement, the measurement apparatus of more particularly to a kind of concrete absolute stress and side
Method.
Background technology
Concrete is a kind of very complicated composite, generally using cement gel and husky molecular mortar as uniformly respectively
To the continuous media of the same sex, and concrete then regards the two-phase composite material of mortar and aggregate composition as.According to concrete stress-
Strain curve, under low-stress state, concrete is presented certain linear elasticity, and when stress is larger, then shows significantly
It is non-linear.Vocal cord injection shows that ultrasonic velocity is the phenomenon relevant with stress state, no matter in elastic range or non-
Linear stress range of strain is present.
At present, both at home and abroad for the research of concrete acoustic characteristic is concentrated mainly under zero stress state, but due to coagulation
The native complexity of itself, it is also few for the research of acoustic characteristic under its loaded state.At present for xoncrete structure stress
Measuring method is simultaneously few, has by surface layout foil gauge to carry out surface measurement, also has type vibration wire pre-buried in inside configuration
The modes such as sensor are measuring, but no matter which kind of metering system, all accurately, intactly cannot reflect in xoncrete structure
The true stress state in portion.A kind of device and method that can quickly and accurately measure inside concrete absolute stress is needed badly open
Send out.
The content of the invention
In order to overcome the deficiencies in the prior art, the invention provides a kind of measurement apparatus of concrete absolute stress and side
Method, it is accurate, quick, easy and can realize nondestructive measurement which has the advantages that.
The technical solution adopted for the present invention to solve the technical problems is：A kind of measurement apparatus of concrete absolute stress,
Including the first stainless steel tube and the second stainless steel tube, it is characterised in that the port A and port B of the first stainless steel tube is opening,
Second stainless steel tube is vertically set on the side of the first stainless steel tube near port B, and the port C of the second stainless steel tube is opening
And be connected with the first stainless steel tube, the port D sealings of the second stainless steel tube；Inside first stainless steel tube, near the position of port A
The place of putting is provided with the first ultrasound wave receiving transducer, and ultrasonic emitting probe is provided with the top position of port C；Second rustless steel
Inside pipe, the second ultrasound wave receiving transducer is provided with the position of port D.
Preferably, first stainless steel tube and the second stainless steel inside pipe wall are provided with one layer of foamed plastic, for managing
Interior concrete material is isolated with the inwall of stainless steel tube, eliminates the strain of stainless steel tube generation for inner concrete material is made
Into impact, so as to prevent bringing error to stress measurement.
Preferably, the thickness of the foamed plastic is 3 millimeters.
Preferably, send out with the first ultrasound wave receiving transducer, ultrasound wave on first stainless steel tube and the second stainless steel tube
Penetrate probe, the position corresponding section of the second ultrasound wave receiving transducer and be respectively arranged with fixing hole, on fixing hole, be provided with screw rod, spiral shell
Bar one end to be connected with the screw on corresponding probe, the other end is stretched out from fixing hole, is tightened to accordingly popping one's head in using nut
It is fixed.
A kind of measuring method of the concrete absolute stress of utilization said apparatus, including the following steps for carrying out in order：
Step [1] is embedded in predetermined position in casting concrete, by said apparatus in advance, by being bundled in concrete
Realize fixing on the reinforcing bar of structure, then casting concrete, pours after finishing, and the concrete material inside the first stainless steel tube leads to
Cross port A and port B to be directly connected to the xoncrete structure of surrounding, the second stainless steel tube is closed due to its port D, which is internal mixed
Solidifying soil material is isolated with the xoncrete structure outside device；
Step [2] is popped one's head in ultrasonic emitting into row energization using ultrasonic detection equipment, by the second ultrasound wave receiving transducer
To receive, the ultrasonic propagation velocity v under concrete component unstress state is obtained0；
Step [3] is popped one's head in ultrasonic emitting into row energization using ultrasonic detection equipment, by the first ultrasound wave receiving transducer
To receive, the ultrasound wave to propagating along 1 directions of σ is measured, and obtains the ultrasound propagated along 1 directions of xoncrete structure principal stress σ
Spread speed v of ripplet；
Step [4] calculates the big of the absolute stress σ 1 inside xoncrete structure on 1 directions of σ according to following formula
It is little：
In formula, sonoelastic coefficients of the K for ultrasound wave, σ 2 are 0.
The positive effect of the present invention：The present invention can accurately, intactly measure the true stress inside xoncrete structure
State, and measure simple to operate, quick, and nondestructive measurement can be realized.Apparatus structure of the present invention is simple, cost of manufacture
Low, practicality is high, easy to use.
Description of the drawings
Fig. 1 is the structural representation of the measurement apparatus of concrete absolute stress of the present invention.
Specific embodiment
Below in conjunction with the accompanying drawings to a preferred embodiment of the present invention will be described in detail.
With reference to Fig. 1, a kind of measurement apparatus of concrete absolute stress of offer of the preferred embodiment of the present invention, including first not
Rust steel pipe 1 and the second stainless steel tube 2, it is characterised in that the port A3 and port B4 of the first stainless steel tube 1 is opening, second
Stainless steel tube 2 is vertically set on the side of the first stainless steel tube 1 near port B4, and the port C5 of the second stainless steel tube 2 is to open
Mouth is simultaneously connected with the first stainless steel tube 1, the port D6 sealings of the second stainless steel tube 2；Inside first stainless steel tube 1, near end
The first ultrasound wave receiving transducer 7 is provided with the position of mouth A3, ultrasonic emitting is provided with the top position of port C and is visited 8；
Inside second stainless steel tube 2, the second ultrasound wave receiving transducer 9 is provided with the position of port D.
First stainless steel tube 1 and 2 inwall of the second stainless steel tube are provided with the foamed plastic that a layer thickness is 3 millimeters,
For the concrete material in pipe is isolated with the inwall of stainless steel tube, the strain of stainless steel tube generation is eliminated for internal coagulation
The impact that soil material is caused, so as to prevent bringing error to stress measurement.
Visit with the first ultrasound wave receiving transducer 7, ultrasonic emitting on first stainless steel tube 1 and the second stainless steel tube 2
The position corresponding section of the 8, second ultrasound wave receiving transducer 9 is respectively arranged with fixing hole, and screw rod, screw rod are provided with fixing hole
One end to be connected with the screw on corresponding probe, the other end is stretched out from fixing hole, corresponding probe is carried out tightening using nut and is consolidated
It is fixed.
Position is arranged on three spherical embed-type ultrasound probes in stainless steel tube as illustrated, wherein a conduct is sent out
End is penetrated, two used as receiving terminal.In casting concrete, this device is embedded in into predetermined position in advance, it is mixed by being bundled in
Realize fixed (concrete mode can be determined according to site operation situation) on the reinforcing bar of Xtah Crude Clay structure.After concreting is finished,
Due to horizontal direction (1 directions of stress σ) the two ends insertion for illustrating so that the concrete of concrete material and surrounding inside device
Structure is directly connected to, and stress σ 1 is represented inside xoncrete structure in the absolute stress that this side up.In practical application, need
The stress in which direction is surveyed, just device is arranged in the direction.
Vertical direction (2 directions of stress σ) in diagram is due to the bottom end closure of stainless steel tube therefore mixed in this part pipe
Solidifying soil material is isolated with the xoncrete structure outside device, and this part concrete material is can be considered in without restrained condition, no
Affected by stress of the xoncrete structure in 1 directions of σ, therefore its internal stress σ 2 is 0.
Using the measuring method of the concrete absolute stress of said apparatus, including the following steps for carrying out in order：
Step [1] is embedded in predetermined position in casting concrete, by said apparatus in advance, by being bundled in concrete
Realize fixing on the reinforcing bar of structure, then casting concrete, pours after finishing, and the concrete material inside the first stainless steel tube leads to
Cross port A and port B to be directly connected to the xoncrete structure of surrounding, the second stainless steel tube is closed due to its port D, which is internal mixed
Solidifying soil material is isolated with the xoncrete structure outside device；
Step [2] is popped one's head in ultrasonic emitting into row energization using ultrasonic detection equipment, by the second ultrasound wave receiving transducer
To receive, the ultrasonic propagation velocity v under concrete component unstress state is obtained0；
Step [3] is popped one's head in ultrasonic emitting into row energization using ultrasonic detection equipment, by the first ultrasound wave receiving transducer
To receive, the ultrasound wave to propagating along 1 directions of σ is measured, and obtains the ultrasound propagated along 1 directions of xoncrete structure principal stress σ
Spread speed v of ripplet；
Step [4] calculates the big of the absolute stress σ 1 inside xoncrete structure on 1 directions of σ according to following formula
It is little：
In formula, sonoelastic coefficients of the K for ultrasound wave, σ 2 are 0.
Above-described is only the preferred embodiments of the present invention, and the explanation of should be understood that above example is to use
In helping understand the method for the present invention and its core concept, the protection domain being not intended to limit the present invention is all the present invention's
Any modification for being made within thought and principle, equivalent etc., should be included within the scope of the present invention.
Claims (5)
1. a kind of measurement apparatus of concrete absolute stress, including the first stainless steel tube and the second stainless steel tube, it is characterised in that：
The port A and port B of the first stainless steel tube is opening, and the second stainless steel tube is vertically set near the first stainless of port B
The side of steel pipe, the port C of the second stainless steel tube are connected for opening and with the first stainless steel tube, the port of the second stainless steel tube
D is sealed；Inside first stainless steel tube, the first ultrasound wave receiving transducer, the top of port C are provided with the position of port A
Ultrasonic emitting probe is provided with position；Inside second stainless steel tube, the second ultrasound wave is provided with the position of port D
Receiving transducer.
2. measurement apparatus of a kind of concrete absolute stress according to claim 1, it is characterised in that：Described first is stainless
Steel pipe and the second stainless steel inside pipe wall are provided with one layer of foamed plastic.
3. measurement apparatus of a kind of concrete absolute stress according to claim 2, it is characterised in that：The foamed plastic
Thickness be 3 millimeters.
4. measurement apparatus of a kind of concrete absolute stress according to claim 1 and 2, it is characterised in that：Described first
Pop one's head in the first ultrasound wave receiving transducer, ultrasonic emitting on stainless steel tube and the second stainless steel tube, the second ultrasound wave is received and visited
The position corresponding section of head is respectively arranged with fixing hole, is provided with screw rod on fixing hole, screw rod one end with corresponding probe on
Screw connects, and the other end is stretched out from fixing hole, corresponding probe is carried out tightening fixation using nut.
5. a kind of measuring method of the concrete absolute stress of utilization claim 1 described device, including carry out in order as
Lower step：
Step [1] is embedded in predetermined position in casting concrete, by said apparatus in advance, by being bundled in xoncrete structure
Reinforcing bar on realize fix, then casting concrete, pours after finishing, the concrete material inside the first stainless steel tube by end
Mouth A and port B is directly connected to the xoncrete structure of surrounding, and the second stainless steel tube is closed due to its port D, its inner concrete
Material is isolated with the xoncrete structure outside device；
Step [2] is popped one's head in ultrasonic emitting into row energization using ultrasonic detection equipment, is connect by the second ultrasound wave receiving transducer
Receive, obtain the ultrasonic propagation velocity v under concrete component unstress state0；
Step [3] is popped one's head in ultrasonic emitting into row energization using ultrasonic detection equipment, is connect by the first ultrasound wave receiving transducer
Receive, the ultrasound wave to propagating along 1 directions of σ is measured, the ultrasound wave that acquisition is propagated along 1 directions of xoncrete structure principal stress σ
Spread speed vt；
Step [4] calculates the size of the principal stress σ 1 inside xoncrete structure on 1 directions of σ according to following formula：
In formula, sonoelastic coefficients of the K for ultrasound wave, σ 2 are 0.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510342273.9A CN104864990B (en) | 2015-06-18 | 2015-06-18 | Concrete absolute stress measurement device and method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510342273.9A CN104864990B (en) | 2015-06-18 | 2015-06-18 | Concrete absolute stress measurement device and method |
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| CN104864990A CN104864990A (en) | 2015-08-26 |
| CN104864990B true CN104864990B (en) | 2017-04-26 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107449664B (en) * | 2017-05-05 | 2019-08-27 | 交通运输部公路科学研究所 | The method for measuring concrete absolute stress under uniaxial compression using scattered ultrasonic wave method |
| CN109443635B (en) * | 2018-10-09 | 2020-06-19 | 山西省交通科学研究院 | Method for estimating zero stress moment of cement concrete pavement slab in general environment |
| CN112414603B (en) * | 2020-12-01 | 2022-08-23 | 交通运输部公路科学研究所 | Application method of fixed concrete structure stress test system |
| CN112730614A (en) * | 2020-12-22 | 2021-04-30 | 中冶建筑研究总院有限公司 | Surface ultrasonic device and method for detecting prestress value |
| CN113074849A (en) * | 2021-03-26 | 2021-07-06 | 重庆交通大学 | Concrete surface absolute stress measuring method based on laser ultrasonic technology |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100392393C (en) * | 2004-06-03 | 2008-06-04 | 太原理工大学 | Non-destructive determining method for early strength of concrete |
| JP5676084B2 (en) * | 2009-05-22 | 2015-02-25 | 株式会社安藤・間 | Diagnosis method of parts subjected to compressive stress in concrete structures |
| US9255853B2 (en) * | 2012-05-04 | 2016-02-09 | William Marsh Rice University | Non-contact strain sensing of objects by use of single-walled carbon nanotubes |
| CN102865952B (en) * | 2012-09-13 | 2014-11-12 | 许锡宾 | Nondestructive testing method for working stress of concrete |
| CN103397601B (en) * | 2013-08-16 | 2016-06-15 | 中国一冶集团有限公司 | Get rid of the construction method of prestress box beam overlength steel strand tension fault |
| CN104198587B (en) * | 2014-08-12 | 2016-12-07 | 宁波大学 | Concrete material is the measuring method of damage development under static load effect |
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