CN102589408B - Hub type concrete self-shrinkage measuring device - Google Patents
Hub type concrete self-shrinkage measuring device Download PDFInfo
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- CN102589408B CN102589408B CN2012100498179A CN201210049817A CN102589408B CN 102589408 B CN102589408 B CN 102589408B CN 2012100498179 A CN2012100498179 A CN 2012100498179A CN 201210049817 A CN201210049817 A CN 201210049817A CN 102589408 B CN102589408 B CN 102589408B
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- 238000005259 measurement Methods 0.000 claims abstract description 27
- 229910000831 Steel Inorganic materials 0.000 claims description 14
- 239000010959 steel Substances 0.000 claims description 14
- 238000006073 displacement reaction Methods 0.000 claims description 9
- 229910001220 stainless steel Inorganic materials 0.000 claims description 4
- 239000010935 stainless steel Substances 0.000 claims description 4
- 238000000034 method Methods 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 3
- 238000009434 installation Methods 0.000 abstract 2
- 239000000969 carrier Substances 0.000 abstract 1
- 230000000149 penetrating effect Effects 0.000 abstract 1
- 238000000465 moulding Methods 0.000 description 6
- 230000008602 contraction Effects 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 238000011545 laboratory measurement Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000005266 casting Methods 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000007573 shrinkage measurement Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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Abstract
The invention discloses a hub type concrete self-shrinkage measuring device, which relates to a concrete measuring device and solves the problems of unreal data of shrinkage valve, error and the like caused by influence of concrete subjected to template shrinkage effect in the process of measuring self-shrinkage of concrete in the existing laboratory. According to the hub type concrete self-shrinkage measuring device, a hub (4) is fixedly sleeved on a cylindrical rotary body (3) which is rotatably arranged in grooves (2-1) at the upper ends of two supporting columns (2). Four through holes (5-1) are uniformly arranged at the upper part of a crank handle (5) along the circumferential direction. The crank handle (5) is fixedly arranged at one end of the cylindrical rotary body (3). A fixed rod (6) is sequentially arranged on the through holes (5-1) of the crank handle (5) and the supporting columns (2) in a penetrating way. A plurality of installation holes (4-1) are uniformly arranged on the hub (4) along the circumferential direction, and a plurality of concrete measuring carriers (7) are fixedly arranged in the installation holes (4-1) of the hub (4). The invention is suitable for the measurement of concrete self-shrinkage in the laboratory.
Description
Technical field
The present invention relates to a kind of concrete measurement mechanism, be specifically related to a kind of hub type concrete self-shrinkage measuring device.
Background technology
Self-constriction refers to the minimizing of cement-based material apparent volume or length under the condition of sealed maintenance, isothermal, and chemical shrinkage is the reason that causes self-constriction; Condensing is the part of self-constriction, occurs in the moulding stage; Self-desiccation shrinkage is the part of self-constriction, is also a most important part.Because the structure formation time of cement slurry still is difficult to provide clear and definite judgement (end in moulding stage) at present, the test duration of therefore a lot of self-constrictions is during from initial set, also has that 1 day starts from building after moulding.And from test in 1 day after initial set or after building moulding, condensing part has been left in the basket, the result now recorded has affected the accuracy of self-constriction greatly.Domestic scholars proposes concrete self-shrinkage is carried out to areal survey: adopt vertical metering system and non-contact sensor that condensing test initial time is namely started ahead of time after building moulding; Adopt the rectangular formula of horizontal survey and non-contact sensor can test 1 day self-desiccation shrinkage in the past; Adopt vertical clock gauge can test later long-age self-constriction in 1 day.Although the method can effectively solve condensing measurement problem, need moulding respectively for measuring condensing test specimen and the test specimen of self-desiccation shrinkage, and all need separately non-contact sensor to monitor.
In addition, usual method at the laboratory measurement concrete self-shrinkage is: at a rectangular parallelepiped both mold ends end built-in metal post, after casting concrete, cover with the plastic sheeting parcel, subsequently by the non-contacting measuring method of miking or non-contact sensor, measure the displacement of metal column, can measure the linear contraction amount of rectangular parallelepiped concrete sample.The mould of this measurement concrete shrinkage is rectangular parallelepiped, in the concrete coagulation hardening process, the side template of surrounding and base plate all can produce certain constraining force to concrete, hinder concrete contraction, the data of the shrinkage value of measuring in this case are false, and domestic correlative study also confirms that side template causes the measuring error of self-constriction very large.
Summary of the invention
The objective of the invention is to be vulnerable in order to solve concrete in existing laboratory measurement concrete self-shrinkage amount process the impact of template effect of contraction, the data that cause measuring shrinkage value are untrue, the problems such as error that produce, and then a kind of hub type concrete self-shrinkage measuring device is provided.
Technical scheme of the present invention is: hub type concrete self-shrinkage measuring device comprises base and two pillars, the upper end of each pillar all has groove, two parallel being packed on base of pillar, it also comprises the cylinder rotor, wheel hub, wind, fixed bar and a plurality of concrete measurement take up device, wheel hub is fixedly set on the cylinder rotor, the cylinder rotor is rotatably installed in the groove of two pillar upper ends, the top of wind evenly has four through holes in the circumferential direction of the circle, wind is packed in an end of cylinder rotor, fixed bar is located on the through hole and pillar of wind successively, on wheel hub, evenly have in the circumferential direction of the circle a plurality of mounting holes, a plurality of concrete measurements take up in the mounting hole that device is packed in wheel hub, each concrete measurement takes up device and includes upper cover, lower cover, the taper type container, two sensors and two steel discs, the taper type container is the stainless steel taper type container of inner wall smooth, in the taper type container, fill up fresh concrete, the center of upper cover and lower cover all has a center pit, and upper cover and lower cover mount cover respectively the two ends up and down at the taper type container, each pre-buried steel disc of the two ends up and down of fresh concrete, and the position of steel disc is relative with the center pit of upper cover and lower cover, two sensors wear respectively and be packed in upper cover and under cover, each sensor is all relative with the center pit of upper cover and lower cover, and leave gap between each steel disc and each sensor, sensor is eddy displacement sensor.
The present invention compared with prior art has following effect: 1. the taper type container of the present invention stainless steel taper type container that is inner wall smooth, there is no corner angle, and the frictional resistance be subject to during concrete shrinkage is little; 2. taper type container of the present invention is along with wind can arbitrarily angledly overturn, measure when condensing, the taper type container is fixed on vertical position, can change at any time the spatial attitude of taper type container subsequently, as: the horizontal or vertical placement of taper type container, rotate 90 degree or 180 degree, wind can be easily and fast adjustment taper type container position, by fixed bar can be easily and fast the position of definite taper type container, effectively avoided the gravity of fresh concrete and the measuring error produced with the constraining force of template, measured self-shrinking value is more accurate; 3. eddy displacement sensor of the present invention can accurately be measured the poor of concrete displacement, and namely concrete shrinkage value, compensated the impact of environment temperature on the vortex sensor measuring error, guaranteed the measuring accuracy of concrete shrinkage value; 4. of the present invention simple in structure, be easy to realize, production cost is low, applied widely.5. the present invention can measure the concrete in two taper type containers simultaneously, measures efficiency high, reduces measuring equipment and floor area, has reduced the measurement cost.
The accompanying drawing explanation
Fig. 1 is front view of the present invention; Fig. 2 is the cut-open view of Fig. 1 along the A-A place; Fig. 3 is the structural representation that the concrete measurement takes up device; Fig. 4 is that the B of Fig. 1 is to view.
Embodiment
Embodiment one: present embodiment is described in conjunction with Fig. 1-Fig. 4, the hub type concrete self-shrinkage measuring device of present embodiment comprises base 1 and two pillars 2, the upper end of each pillar 2 all has groove 2-1, two parallel being packed on base 1 of pillar 2, it also comprises cylinder rotor 3, wheel hub 4, wind 5, fixed bar 6 and a plurality of concrete measurement take up device 7, wheel hub 4 is fixedly set on cylinder rotor 3, cylinder rotor 3 is rotatably installed in the groove 2-1 of two pillar 2 upper ends, the top of wind 5 evenly has four through hole 5-1 in the circumferential direction of the circle, wind 5 is packed in an end of cylinder rotor 3, fixed bar 6 is located on the through hole 5-1 and pillar 2 of wind 5 successively, on wheel hub 4, evenly have in the circumferential direction of the circle a plurality of mounting hole 4-1, a plurality of concrete measurements take up in the mounting hole 4-1 that device 7 is packed in wheel hub 4, each concrete measurement takes up device 7 and includes upper cover 8, lower cover 9, taper type container 10, two sensors 11 and two steel discs 12, taper type container 10 is the stainless steel taper type container of inner wall smooth, in taper type container 10, fill up fresh concrete, the center of upper cover 8 and lower cover 9 all has a center pit, and upper cover 8 and lower cover 9 mount cover respectively the two ends up and down at taper type container 10, each pre-buried steel disc 12 of the two ends up and down of fresh concrete, and the position of steel disc 12 is relative with the center pit of upper cover 8 and lower cover 9, two sensors 11 wear respectively and are packed on upper cover 8 and lower cover 9, each sensor 11 is all relative with the center pit of upper cover 8 and lower cover 9, and leave gap between each steel disc 12 and each sensor 11, sensor 11 is eddy displacement sensor.
Embodiment two: in conjunction with Fig. 2, present embodiment is described, the quantity that the concrete measurement of present embodiment takes up device 7 is 2,4 or 6.So arrange, be convenient to simultaneously a plurality of concrete measurements to be taken up to device and measure.Other composition and annexation are identical with embodiment one.
Embodiment three: in conjunction with Fig. 2 and Fig. 3, present embodiment is described, the in the vertical direction of present embodiment, the concrete measurement take up device 7 taper type container 10 small end all straight up.So arrange, be convenient to the condensing measurement of concrete and reduce the impact of taper turret vessel sidewall friction power on concrete shrinkage.Other composition and annexation are identical with embodiment one or two.
Embodiment four: present embodiment is described in conjunction with Fig. 2, the self-shrinkage measuring device of present embodiment also comprises many group fixed mounts 13, fixed mount 13 is hooked on taper type container 10 and is packed on wheel hub 4, and the quantity of fixed mount 13 is identical with the quantity that the concrete measurement takes up device 7.So arrange, be convenient to more a plurality of concrete measurements to be taken up to device and be fixed.Other composition and annexation are identical with embodiment three.
The course of work of the present invention is:
In the taper type container, fill up fresh concrete, first adjust one or two taper type container and be vertical position, the large diameter bottom of taper type container below, the top of minor diameter is up.Adjust the gap between eddy displacement sensor and steel disc, by voltage signal input instrument or the computing machine of eddy displacement sensor output.Concrete, in the plastic stage, keeps the vertical transfixion of taper type container always, and the now variation in the gap between the measured sensor of eddy displacement sensor and steel disc, be concrete condensing.After concrete initial set, the taper type container can be regularly according to clockwise direction overturn (0 degree, 90 degree or 180 degree), while not measuring, the taper type container can keep horizontal positioned, during measurement, the taper type container is vertical position, and guarantees that termination that diameter is little up, now, measured concrete deformation is the self-constriction after setting and harden.The measured concrete self-shrinkage of this device utilizes same test specimen, same measurement mechanism, from concrete formation constantly, realize the concrete self-shrinkage measurement of (comprising the condensing of plastic stage).
Claims (4)
1. hub type concrete self-shrinkage measuring device, it comprises base (1), two pillars (2) and a plurality of concrete measurement take up device (7), the upper end of each pillar (2) all has groove (2-1), two pillars (2) are parallel to be packed on base (1), each concrete measurement takes up device (7) and includes upper cover (8), lower cover (9) and taper type container (10), taper type container (10) is the stainless steel taper type container of inner wall smooth, the taper type container fills up fresh concrete in (10), the center of upper cover (8) and lower cover (9) all has a center pit, and upper cover (8) and lower cover (9) mount cover respectively the two ends up and down at taper type container (10), it is characterized in that: described hub type concrete self-shrinkage measuring device also comprises cylinder rotor (3), wheel hub (4), wind (5) and fixed bar (6), wheel hub (4) is fixedly set on cylinder rotor (3), cylinder rotor (3) is rotatably installed in the groove (2-1) of two pillars (2) upper end, the top of wind (5) evenly has four through holes (5-1) in the circumferential direction of the circle, wind (5) is packed in an end of cylinder rotor (3), fixed bar (6) is located on the through hole (5-1) and pillar (2) of wind (5) successively, on wheel hub (4), evenly have in the circumferential direction of the circle a plurality of mounting holes (4-1), a plurality of concrete measurements take up in the mounting hole (4-1) that device (7) is packed in wheel hub (4), described each concrete measurement takes up device (7) and also comprises two sensors (11) and two steel discs (12), each pre-buried steel disc (12) of the two ends up and down of fresh concrete, and the position of steel disc (12) is relative with the center pit of upper cover (8) and lower cover (9), two sensors (11) wear respectively and are packed on upper cover (8) and lower cover (9), each sensor (11) is all relative with the center pit of upper cover (8) and lower cover (9), and leave gap between each steel disc (12) and each sensor (11), sensor (11) is eddy displacement sensor.
2. hub type concrete self-shrinkage measuring device according to claim 1, it is characterized in that: the quantity that the concrete measurement takes up device (7) is 2,4 or 6.
3. hub type concrete self-shrinkage measuring device according to claim 2 is characterized in that: while measuring the concrete shrinkage amount, the taper type container (10) that concrete measurements takes up device (7) is in the vertical direction fixedly, and its small end makes progress.
4. according to the described hub type concrete self-shrinkage measuring device of claim 1 or 3, it is characterized in that: described self-shrinkage measuring device also comprises many group fixed mounts (13), fixed mount (13) is hooked on taper type container (10) and goes up and be packed in wheel hub (4) above, and the quantity of fixed mount (13) is identical with the quantity that the concrete measurement takes up device (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100498179A CN102589408B (en) | 2012-02-29 | 2012-02-29 | Hub type concrete self-shrinkage measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100498179A CN102589408B (en) | 2012-02-29 | 2012-02-29 | Hub type concrete self-shrinkage measuring device |
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| Publication Number | Publication Date |
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| CN102589408A CN102589408A (en) | 2012-07-18 |
| CN102589408B true CN102589408B (en) | 2013-11-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2012100498179A Expired - Fee Related CN102589408B (en) | 2012-02-29 | 2012-02-29 | Hub type concrete self-shrinkage measuring device |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105717283B (en) * | 2016-01-28 | 2018-02-13 | 山东大学 | A kind of cement mortar, which is dried, shrinks testing jig and method of testing |
| CN109856374B (en) * | 2018-12-26 | 2022-02-22 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | Concrete self-shrinkage test method |
| CN110187084A (en) * | 2019-06-14 | 2019-08-30 | 舟山道隆科技有限公司 | Concrete early age shrinkage deformation characteristic measuring method |
| CN112857299B (en) * | 2020-12-30 | 2022-10-11 | 江苏法尔胜光电科技有限公司 | Mounting method of displacement sensor for tunnel |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP3975255B2 (en) * | 2000-05-15 | 2007-09-12 | 株式会社共和電業 | Concrete embedded strain gauge and concrete strain measurement method |
| CN200979544Y (en) * | 2006-11-03 | 2007-11-21 | 北京工业大学 | A cement concrete autogenous-shrinkage ratio detector |
| JP2009020081A (en) * | 2007-07-14 | 2009-01-29 | Bridgestone Corp | Deformation measuring method and deformation measuring device |
| CN201307097Y (en) * | 2008-07-01 | 2009-09-09 | 舟山市博远科技开发有限公司 | Testing device for early age shrinkage performance test of concrete in eddy current method |
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| CN102589408A (en) | 2012-07-18 |
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Owner name: JIANGSU JINLING CONSTRUCTION ENGINEERING GROUP CO. Effective date: 20121109 |
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| CB03 | Change of inventor or designer information |
Inventor after: Yang Yingzi Inventor after: Fan Guangfeng Inventor after: Tang Shibing Inventor after: Ding Guangming Inventor before: Yang Yingzi |
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Free format text: CORRECT: INVENTOR; FROM: YANG YINGZI TO: YANG YINGZI FAN GUANGFENG TANG SHIBING DING GUANGMING |
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Effective date of registration: 20121109 Address after: 150001 Harbin, Nangang, West District, large straight street, No. 92 Applicant after: Harbin Institute of Technology Applicant after: Jiangsu Jinling Construction Engineering Group Co., Ltd. Address before: 150001 Harbin, Nangang, West District, large straight street, No. 92 Applicant before: Harbin Institute of Technology |
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