CN101750047A - Monitoring device and method for contraction distortion of concrete structure - Google Patents
Monitoring device and method for contraction distortion of concrete structure Download PDFInfo
- Publication number
- CN101750047A CN101750047A CN200810239362A CN200810239362A CN101750047A CN 101750047 A CN101750047 A CN 101750047A CN 200810239362 A CN200810239362 A CN 200810239362A CN 200810239362 A CN200810239362 A CN 200810239362A CN 101750047 A CN101750047 A CN 101750047A
- Authority
- CN
- China
- Prior art keywords
- metal drum
- concrete
- cavity
- described metal
- strainometer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Abstract
The embodiment of the invention discloses a monitoring device for contraction distortion of concrete structure. The device comprises a metal bucket, a soft layer and a strain gauge. The embodiment of the invention also discloses a monitoring method for contraction distortion of concrete structure. With the above device and method adopted, the condition of contraction distortion of large concrete structure in the whole service life can be precisely monitored in real time, thus performing reliable safety assessment to project structures.
Description
Technical field
The present invention relates to engineering structure experimental measurement technical field, refer in particular to a kind of monitoring device and method of contraction distortion of concrete structure.
Background technology
In industry and covil construction field, for some important large-sized concrete structures or large-sized prestress xoncrete structure (for example, nuclear power plant containment shell, road and bridge, large scale industry factory building etc.), generally all need in the whole phase in longevity of this xoncrete structure, carry out tracking and monitoring by the force-bearing situation to this structure, thereby guarantee the normal operation and the use of this xoncrete structure.
As time goes on, various xoncrete structures in the actual application environment are except producing because being subjected to external stress the distortion, also can produce drawdown deformation because of the contraction of xoncrete structure, be that xoncrete structure is when hardening in air, to make the volume-diminished of this xoncrete structure owing to heat radiation and hardening process gradually, thereby produce drawdown deformation.When differential contraction stress that above-mentioned drawdown deformation produced surpasses concrete ultimate tensile strength (UTS), will in this xoncrete structure, produce contraction fissure, thereby influence the security of this xoncrete structure.Therefore, in order to guarantee the security of xoncrete structure, need carry out tracking and monitoring to the drawdown deformation of xoncrete structure inside.
In the prior art, the empirical data in general many code requirements is predicted the differential contraction stress of xoncrete structure inside, or comes the differential contraction stress of xoncrete structure inside is detected by the prism standard specimen.Yet, the influence factor that causes xoncrete structure to produce drawdown deformation has a variety of, except that the starting material of xoncrete structure self, match ratio, age phase, the environment for use temperature of this xoncrete structure, humidity etc. all are the essential condition of this xoncrete structure shrinkage degree of decision, the drawdown deformation that different xoncrete structure inside is produced is also inconsistent, so the differential contraction stress of the xoncrete structure inside in actual application environment empirical data general also very difficult and in the standard is consistent; In addition, except drawdown deformation, large-scale xoncrete structure generally also can produce stress deformation because being subjected to external stress, therefore, when using the prism standard specimen to detect, except drawdown deformation, will comprise also that this xoncrete structure is subjected to external stress and the stress deformation that produces in its testing result, cause thus above-mentioned drawdown deformation and stress deformation are difficult to distinguish, thereby can't monitor accurately the drawdown deformation of inside concrete.
Summary of the invention
In view of this, the fundamental purpose of the embodiment of the invention is to provide a kind of monitoring device and method of contraction distortion of concrete structure, thereby the drawdown deformation of inside concrete is accurately monitored.
For achieving the above object, the technical scheme in the embodiment of the invention is achieved in that
A kind of monitoring device of contraction distortion of concrete structure, this device comprises: metal drum, soft layer and strainometer; Wherein,
The edge of the opening surface of described metal drum has outside horizontal flange; And when user mode, inside and outside all filling of the cavity of described metal drum has concrete; The concrete that described metal drum is used for the cavity of alternative this metal drum bears corresponding load;
Described soft layer is attached at the inside surface of described metal drum, is used for concrete in the described metal drum and the isolation of described metal drum;
Described strainometer is arranged in the concrete of the cavity of described metal drum, is used to monitor the drawdown deformation of xoncrete structure; A lead-in wire of drawing from an end of described strainometer stretches out in outside the described xoncrete structure to be monitored, is used to read the reading of described strainometer.
A kind of monitoring method of contraction distortion of concrete structure, this method comprises:
The metal drum that the edge that inside surface is pasted with soft layer and opening surface has outside horizontal flange is embedded in the xoncrete structure to be monitored straight up; Casting concrete in the cavity of described metal drum;
When casting concrete in the cavity of described metal drum, strainometer is arranged in the concrete in the cavity of described metal drum, and draw a lead-in wire from an end of described strainometer and stretch out in outside the described xoncrete structure to be monitored, be used to obtain the reading of described strainometer;
After finishing concrete building, according to the reading of described strainometer, the monitoring contraction distortion of concrete structure.
A kind of monitoring device and method of contraction distortion of concrete structure are provided in the embodiments of the invention in summary.Because said apparatus is embedded in the inside of xoncrete structure to be monitored, can monitor the data of this contraction distortion of concrete structure to be monitored in real time; And metal drum in this device and soft layer have carried the suffered various external stresses of concrete in the described cavity, make the xoncrete structure in the cavity that metal drum surrounded be in zero stress state, therefore the distortion of the described strainometer xoncrete structure of monitoring only is drawdown deformation, and does not comprise stress deformation.Therefore, by using above-mentioned apparatus and method, can carry out monitoring in real time and accurately to the situation of large-sized concrete structure drawdown deformation in the whole phase in longevity, thereby can carry out reliable safety assessment engineering structure.
Description of drawings
Fig. 1 is the synoptic diagram of a kind of monitoring device of contraction distortion of concrete structure in the embodiment of the invention.
Fig. 2 is the synoptic diagram of the monitoring device of another kind of contraction distortion of concrete structure in the embodiment of the invention.
Fig. 3 is the process flow diagram of the monitoring method of contraction distortion of concrete structure in the embodiment of the invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention express clearlyer, the present invention is further described in more detail below in conjunction with drawings and the specific embodiments.
Fig. 1 and Fig. 2 are the synoptic diagram of the monitoring device of contraction distortion of concrete structure in the embodiment of the invention.The monitoring device of this contraction distortion of concrete structure is applied in the xoncrete structure 1, promptly in use, needs the monitoring device of this contraction distortion of concrete structure is embedded in the xoncrete structure to be monitored 1 straight up.As depicted in figs. 1 and 2, the monitoring device of contraction distortion of concrete structure comprises in the embodiment of the invention: metal drum 2, soft layer 3 and strainometer 4.
Described metal drum 2 has straight up an opening surface; Edge at the opening surface of this metal drum 2 has outside horizontal flange 5, is used to share the acting force of the edge of described opening surface for xoncrete structure, in order to avoid destroy the integrity of whole xoncrete structure to be monitored.This horizontal flange 5 can be circular flange, and the thickness of this horizontal flange 5 equates with the thickness of metal drum 2.In addition, described metal drum 2 can be made by metals such as steel, iron or alloys, has certain rigidity and thickness, thereby the concrete that can be used for substituting the cavity that this metal drum 2 surrounded (for example bears corresponding load, outside various stress), the integrity that keeps whole xoncrete structure to be monitored, therefore, the thickness, the length degree of depth, bottom external diameter area, opening surface area, horizontal flange 5 that can pre-determine described metal drum 2 according to concrete applied environment in the horizontal direction width and make material of described metal drum 2 etc.In addition, the cavity of described metal drum 2 can be cylindrical cavity (as shown in Figure 1, metal drum with this cavity geometry relatively is convenient to make), round table-like cavity (as shown in Figure 2, metal drum with this cavity geometry relatively is convenient to construction, for example, be convenient to concrete perfusion etc.) or the cavity of other shape, and when user mode, concrete is arranged inside and outside all filling of the cavity of metal drum 2.Because metal drum 2 has an opening surface, make that the inside and outside concrete of described cavity is as a whole, thereby make the inside and outside concrete of described cavity on humidity, temperature, all be consistent, therefore, only need monitor, can know the drawdown deformation of whole xoncrete structure to be monitored the drawdown deformation of the xoncrete structure in the described cavity.In addition, described metal drum 2 can once be made by the mode of punching press, also can make by the mode of welding; Can use manufacture method commonly used in this area to finish the manufacturing of described metal drum 2, concrete manufacture method does not repeat them here.
Described soft layer 3 is attached at the inside surface of described metal drum 2, is used for concrete in the metal drum 2 and metal drum 2 are isolated.This soft layer 3 can be made by various soft materials (for example, polyfoam, malthoid or sealing compound etc.).By above-mentioned metal drum 2 and soft layer 3, can make the concrete of metal drum 2 inside not be subjected to the stress influence of cavity outside, thereby be in zero stress state.In addition, because the contraction deformation that produced of concrete result is generally all smaller, therefore the thickness of described soft layer 3 can be much smaller than the thickness of the bucket wall of described metal drum 2, and thickness that should soft layer 3 can preestablish according to practical situations.In addition, described soft layer 3 can be attached at the inside surface of described metal drum 2 by corresponding sticky object or other bonding way commonly used, and concrete attaching method does not repeat them here.
Described strainometer 4 is positioned in (for example, vertically placing or horizontal positioned) concrete in the cavity that above-mentioned metal drum 2 surrounds, and is used to monitor the drawdown deformation of xoncrete structure.In addition, a lead-in wire of drawing from an end of described strainometer 4 stretches out in (all not shown Fig. 1 and Fig. 2) outside the described xoncrete structure to be monitored, be used to read the reading of described strainometer 4, thereby the drawdown deformation to whole xoncrete structure to be monitored is monitored, and the drawdown deformation of xoncrete structure is distinguished from comprehensive deformation.
In preferred embodiment of the present invention, under concrete application scenarios (for example, in the containment of certain nuclear power station), can the monitoring device of above-mentioned contraction distortion of concrete structure be embedded in the low stress zones of xoncrete structure to be monitored according to the specific (special) requirements of applied environment.In specific embodiment, the cavity of described metal drum is a cylindrical cavity, and the external diameter of this metal drum is that 114 millimeters (mm), length are 330mm, and soft layer is made for polyfoam.In the actual measurement process, the monitoring device of above-mentioned contraction distortion of concrete structure has been obtained good monitoring effect.
Fig. 3 is the process flow diagram of the monitoring method of contraction distortion of concrete structure in the embodiment of the invention.As shown in Figure 3, the monitoring method of contraction distortion of concrete structure comprises step as described below in the embodiment of the invention:
Specifically, in embodiments of the present invention, can be before carrying out concreting, just the metal drum in the monitoring device of above-mentioned contraction distortion of concrete structure is embedded in straight up in the zone at xoncrete structure place to be monitored, carry out concreting then, for example, casting concrete in the cavity of described metal drum.
Specifically, in embodiments of the present invention, when casting concrete in the cavity of described metal drum, also above-mentioned strainometer need be arranged in the concrete in the cavity of described metal drum.Preferable, the volume of concrete of in the cavity of described metal drum, being built reach described metal drum cavity volume two/for the moment, strainometer is arranged in the concrete in the cavity of described metal drum; Then, the concrete of cavity of finishing described metal drum built.At last, draw a lead-in wire from an end of described strainometer and stretch out in outside the xoncrete structure to be monitored, be used to obtain the reading of this strainometer.
In addition, before carrying out concreting, the thickness, the degree of depth, bottom area, opening surface area, horizontal flange 5 of also can be in advance determining the metal drum 2 in the device of described monitoring contraction distortion of concrete structure according to concrete applied environment in the horizontal direction width or make the material etc. of described metal drum 2.
Specifically, in embodiments of the present invention, can obtain the reading of this strainometer according to the lead-in wire of above-mentioned strainometer, thereby the drawdown deformation of xoncrete structure to be monitored be monitored according to the reading of this strainometer.
As from the foregoing, when monitoring device that uses the above-mentioned contraction distortion of concrete structure that the embodiment of the invention provided and method, because this device is embedded in the inside of xoncrete structure to be monitored, can monitor the drawdown deformation of this xoncrete structure to be monitored in real time; And metal drum in this device and soft layer have carried the suffered various external stresses of concrete in the described cavity, make the xoncrete structure in the cavity that metal drum surrounded be in zero stress state, therefore the distortion of the described strainometer xoncrete structure of monitoring only is drawdown deformation, and does not comprise stress deformation.Therefore, by using above-mentioned apparatus and method, can carry out monitoring in real time and accurately to the situation of large-sized concrete structure drawdown deformation in the whole phase in longevity, thereby can carry out reliable safety assessment engineering structure.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. the monitoring device of a contraction distortion of concrete structure is characterized in that, this device comprises: metal drum, soft layer and strainometer; Wherein,
The edge of the opening surface of described metal drum has outside horizontal flange; And when user mode, inside and outside all filling of the cavity of described metal drum has concrete; The concrete that described metal drum is used for the cavity of alternative this metal drum bears corresponding load;
Described soft layer is attached at the inside surface of described metal drum, is used for concrete in the described metal drum and the isolation of described metal drum;
Described strainometer is arranged in the concrete of the cavity of described metal drum, is used to monitor the drawdown deformation of xoncrete structure; A lead-in wire of drawing from an end of described strainometer stretches out in outside the described xoncrete structure to be monitored, is used to read the reading of described strainometer.
2. device according to claim 1 is characterized in that, the material of described metal drum is steel, iron or alloy.
3. device according to claim 1 is characterized in that, the thickness of described horizontal flange equates with the thickness of the bucket wall of metal drum.
4. device according to claim 1 is characterized in that, the cavity of described metal drum is cylindrical cavity or round table-like cavity.
5. device according to claim 1 is characterized in that, the material of described soft layer is a soft material.
6. device according to claim 5 is characterized in that, described soft material is polyfoam, malthoid or sealing compound.
7. device according to claim 1 is characterized in that, the thickness of described soft layer is less than the thickness of the bucket wall of described metal drum.
8. the monitoring method of a contraction distortion of concrete structure is characterized in that, this method comprises:
The metal drum that the edge that inside surface is pasted with soft layer and opening surface has outside horizontal flange is embedded in the xoncrete structure to be monitored straight up; Casting concrete in the cavity of described metal drum;
When casting concrete in the cavity of described metal drum, strainometer is arranged in the concrete in the cavity of described metal drum, and draw a lead-in wire from an end of described strainometer and stretch out in outside the described xoncrete structure to be monitored, be used to obtain the reading of described strainometer;
After finishing concrete building, according to the reading of described strainometer, the monitoring contraction distortion of concrete structure.
9. method according to claim 8 is characterized in that, this method also comprises:
The thickness, the degree of depth, bottom area, opening surface area, described horizontal flange of determining described metal drum according to concrete applied environment in the horizontal direction width or make the material of described metal drum.
10. method according to claim 8 is characterized in that, and is described when casting concrete in the cavity of described metal drum, strainometer is arranged in the concrete in the cavity of described metal drum to comprise:
The volume of concrete of in the cavity of described metal drum, being built reach described metal drum cavity volume two/for the moment, described strainometer is arranged in the concrete in the cavity of described metal drum; Then, the concrete of cavity of finishing described metal drum built.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810239362A CN101750047A (en) | 2008-12-11 | 2008-12-11 | Monitoring device and method for contraction distortion of concrete structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810239362A CN101750047A (en) | 2008-12-11 | 2008-12-11 | Monitoring device and method for contraction distortion of concrete structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101750047A true CN101750047A (en) | 2010-06-23 |
Family
ID=42477373
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200810239362A Pending CN101750047A (en) | 2008-12-11 | 2008-12-11 | Monitoring device and method for contraction distortion of concrete structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101750047A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101936704A (en) * | 2010-08-20 | 2011-01-05 | 四川嘉华企业（集团）股份有限公司 | Analog detecting method for concrete grown volume deformation and device thereof |
| CN102937492A (en) * | 2012-10-26 | 2013-02-20 | 北京工业大学 | Method for monitoring absolute stress of pre-stress concrete bridge |
| CN104792298A (en) * | 2015-04-27 | 2015-07-22 | 北京工业大学 | Embedded concrete strainometer |
| CN106643461A (en) * | 2016-11-29 | 2017-05-10 | 上海浦兴路桥建设工程有限公司 | External sensor and method of monitoring internal strain of concrete structure |
| CN108844514A (en) * | 2018-05-04 | 2018-11-20 | 中国水利水电科学研究院 | Strain gauge and the unstressed strain gauge means of fully graded concrete |
| CN109297865A (en) * | 2018-10-09 | 2019-02-01 | 山西省交通科学研究院 | A kind of measuring method of the early age structural stress of Cement Concrete Pavement Slab |
| CN109443231A (en) * | 2018-12-22 | 2019-03-08 | 中国地质大学（武汉） | It is a kind of by Fibre Optical Sensor it is unstressed based on |
| CN109443635A (en) * | 2018-10-09 | 2019-03-08 | 山西省交通科学研究院 | The predictor method at Cement Concrete Pavement Slab zero stress moment under general environment |
-
2008
- 2008-12-11 CN CN200810239362A patent/CN101750047A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101936704A (en) * | 2010-08-20 | 2011-01-05 | 四川嘉华企业（集团）股份有限公司 | Analog detecting method for concrete grown volume deformation and device thereof |
| CN102937492A (en) * | 2012-10-26 | 2013-02-20 | 北京工业大学 | Method for monitoring absolute stress of pre-stress concrete bridge |
| CN102937492B (en) * | 2012-10-26 | 2014-11-26 | 北京工业大学 | Method for monitoring absolute stress of pre-stress concrete bridge |
| CN104792298A (en) * | 2015-04-27 | 2015-07-22 | 北京工业大学 | Embedded concrete strainometer |
| CN106643461A (en) * | 2016-11-29 | 2017-05-10 | 上海浦兴路桥建设工程有限公司 | External sensor and method of monitoring internal strain of concrete structure |
| CN108844514A (en) * | 2018-05-04 | 2018-11-20 | 中国水利水电科学研究院 | Strain gauge and the unstressed strain gauge means of fully graded concrete |
| CN109297865A (en) * | 2018-10-09 | 2019-02-01 | 山西省交通科学研究院 | A kind of measuring method of the early age structural stress of Cement Concrete Pavement Slab |
| CN109443635A (en) * | 2018-10-09 | 2019-03-08 | 山西省交通科学研究院 | The predictor method at Cement Concrete Pavement Slab zero stress moment under general environment |
| CN109297865B (en) * | 2018-10-09 | 2021-03-23 | 山西省交通科学研究院 | Method for measuring early-age structural stress of cement concrete pavement slab |
| CN109443231A (en) * | 2018-12-22 | 2019-03-08 | 中国地质大学（武汉） | It is a kind of by Fibre Optical Sensor it is unstressed based on |
| CN109443231B (en) * | 2018-12-22 | 2021-05-28 | 中国地质大学（武汉） | Stress-free meter based on optical fiber sensing |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101750047A (en) | Monitoring device and method for contraction distortion of concrete structure | |
| CN106124313B (en) | Concrete and similar material are by the test device for depressing comprehensive deformation performance | |
| CN105117536A (en) | Simplified elastic-plastic fracture mechanics analysis method for RPV having crack defects | |
| CN112084555A (en) | Method for calculating bearing capacity of ring plate of circumferential stiffening rib true test data node of steel pipe tower | |
| CN111024529B (en) | Method for testing dynamic mechanical properties of rock at high temperature and heating furnace matched with method | |
| US11402194B2 (en) | Safety pipe loop and method for strain monitoring of mountainous pipelines | |
| CN102866245A (en) | Test method and test device for unrestraint measurement of concrete deformation performance | |
| CN110651102A (en) | Prefabricated segment for a tunnel and method for producing and monitoring the prefabricated segment | |
| US10712316B2 (en) | Fixed value residual stress test block and manufacturing and preservation method thereof | |
| Zhou et al. | Experimental and numerical buckling failure analysis of acrylic hemispheres for application in neutrino detector | |
| CN116840062A (en) | Method for evaluating safety of gas storage in lining karst cave based on physical model test | |
| CN114002063A (en) | Method for predicting rock failure | |
| Qian et al. | Investigation on constraint effect of a reactor pressure vessel subjected to pressurized thermal shocks | |
| CN112115625A (en) | Calculation method for extra-high voltage power transmission tower true test data node main pipe bearing capacity | |
| Hyde et al. | Some considerations on specimen types for small sample creep tests | |
| Hanifehzadeh et al. | Multi-hazard performance of reinforced concrete dry casks subjected to chloride attack and tip-over impact | |
| Rajani | Nonlinear stress–strain characterization of cast iron used to manufacture pipes for water supply | |
| CN103994842A (en) | Method for measuring residual stress of composite material annular part based on cutting and bending method | |
| CN103162877B (en) | A kind of method checking bolt load | |
| Benedetti et al. | Structural health monitoring of wind towers: residual fatigue life estimation | |
| Dong et al. | Failure experiment and calculation model for prestressed concrete cylinder pipe under three-edge bearing test using distributed fiber optic sensors | |
| CN108775855B (en) | Measuring device for circumferential strain of through hole in static crushing process | |
| CN102554184A (en) | Method for controlling quality of castings obtained through low pressure casting and dynamic pressure detecting device thereof | |
| CN204457829U (en) | Rockbolt stress state rapid evaluation device | |
| CN205614809U (en) | Pour mould of formula of partly buryying concrete |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20100623 |