CN102608298B - Hand-shaking type concrete self-constriction measuring device - Google Patents
Hand-shaking type concrete self-constriction measuring device Download PDFInfo
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- CN102608298B CN102608298B CN201210049852.0A CN201210049852A CN102608298B CN 102608298 B CN102608298 B CN 102608298B CN 201210049852 A CN201210049852 A CN 201210049852A CN 102608298 B CN102608298 B CN 102608298B
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Abstract
The invention provides a hand-shaking type concrete self-constriction measuring device, relating to a concrete measuring device and solving the problems that the concrete is easily influenced by a template restraining function in a process of measuring the concrete self-constriction by the existing laboratory, the data of a measured constriction value are not real, and an error is generated and the like. One ends of two cylinders are respectively and rotatably mounted in a groove at the upper end of a support; the other ends of the two cylinders are respectively and fixedly connected with two side walls of a frustum-shaped container; the centers of an upper cover and a lower cover are provided with central holes; upper and lower ends of newly-mixed concrete are respectively pre-buried with steel sheets; two sensors are respectively fixedly arranged on the upper cover and the lower cover in a penetrating mode; a sensor is a vortex displacement sensor; the upper part of a hand-shaking handle is uniformly provided with four through holes along a peripheral direction; the hand-shaking handle is fixedly arranged at one ends of the cylinders; and a fixing rod respectively passes through a through hole of the hand-shaking handle and the support. The hand-shaking type concrete self-constriction measuring device disclosed by the invention is suitable for measuring the concrete self-constriction in the laboratory.
Description
Technical field
The present invention relates to a kind of concrete measurement mechanism, be specifically related to a kind of hand-rail 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 a part for self-constriction, occurs in the moulding stage; Self-desiccation shrinkage is a part for self-constriction, is also a most important part.Because the structure formation time of cement slurry is still 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 moulding.And within 1 day, test after initial set or after building moulding, condensing part has been left in the basket, and the result now recording has affected the accuracy of self-constriction greatly.Domestic scholars proposes concrete self-shrinkage to carry out areal survey: adopt vertical metering system and non-contact sensor can make condensing test initial time after building moulding, start ahead of time; 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 to distinguish moulding 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 laboratory measurement concrete self-shrinkage is: at a rectangular parallelepiped both mold ends end built-in metal post, after casting concrete, with plastic sheeting parcel, cover, 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 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 are in this case false, and domestic correlative study also confirms that side template causes the measuring error of self-constriction very large.
Summary of the invention
The object 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 hand-rail type concrete self-shrinkage measuring device is provided.
Technical scheme of the present invention is: hand-rail 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, described hand-rail type concrete self-shrinkage measuring device also comprises upper cover, lower cover, taper type container, two right cylinders, two sensors, two steel discs, wind and fixed bar, taper type container is the stainless steel taper type container of inner wall smooth, two cylindrical one end are rotatably installed in respectively in the groove of a pillar upper end, two cylindrical other ends are affixed with two sidewalls of taper type container respectively, in 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 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 top of wind along the circumferential direction evenly has four through holes, wind is packed in cylindrical one end, fixed bar is located on the through hole and pillar of wind successively.
The present invention compared with prior art has following effect: 1. the stainless steel taper type container that taper type container of the present invention is inner wall smooth, there is no corner angle, and the frictional resistance being 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, 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, the position of definite taper type container that can be easily and fast by fixed bar, effectively avoided the gravity of fresh concrete and the measuring error producing 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 concrete shrinkage value, has compensated the impact of environment temperature on vortex sensor measuring error, has 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.
Accompanying drawing explanation
Fig. 1 is front view of the present invention; Fig. 2 is that the B of Fig. 1 is to view.
Embodiment
Embodiment one: present embodiment is described in conjunction with Fig. 1 and Fig. 2, the hand-rail 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, described hand-rail type concrete self-shrinkage measuring device also comprises upper cover 3, lower cover 4, taper type container 5, two right cylinders 6, two sensors 7, two steel discs 8, wind 9 and fixed bar 10, the stainless steel taper type container that taper type container 5 is inner wall smooth, one end of two right cylinders 6 is rotatably installed in respectively in the groove 2-1 of pillar 2 upper ends, the other end of two right cylinders 6 is affixed with two sidewalls of taper type container 5 respectively, in taper type container 5, fill up fresh concrete, the center of upper cover 3 and lower cover 4 all has a center pit, and upper cover 3 and lower cover 4 mount cover respectively the two ends up and down at taper type container 5, each pre-buried steel disc 8 of the two ends up and down of fresh concrete, and the position of steel disc 8 is relative with the center pit of upper cover 3 and lower cover 4, two sensors 7 wear respectively and are packed on upper cover 3 and lower cover 4, each sensor 7 is all relative with the center pit of upper cover 3 and lower cover 4, and leave gap between each steel disc 8 and each sensor 7, sensor 7 is eddy displacement sensor, the top of wind 9 along the circumferential direction evenly has four through hole 9-1, wind 9 is packed in one end of right cylinder 6, fixed bar 10 is located on the through hole 9-1 and pillar 2 of wind 9 successively.
Embodiment two: in conjunction with Fig. 1 and Fig. 2, present embodiment is described, two sensors 7 of present embodiment are packed on upper cover 3 and lower cover 4 by a nut respectively.So arrange, be convenient to change and maintenance.Other composition and annexation are identical with embodiment one.
The course of work of the present invention is:
In taper type container, fill up fresh concrete, first adjust 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, is concrete condensing.After concrete initial set, the upset that taper type container can regularly forward and reverse (0 degree, 90 degree or 180 degree), when unmeasured, taper type container keeps horizontal positioned, during measurement, 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.This installs measured concrete self-shrinkage and 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 (2)
1. a hand-rail type concrete self-shrinkage measuring device, it comprises base (1) and two pillars (2), the upper end of each pillar (2) all has groove (2-1), two pillars (2) are parallel to be packed on base (1), it is characterized in that: described hand-rail type concrete self-shrinkage measuring device also comprises upper cover (3), lower cover (4), taper type container (5), two right cylinders (6), two sensors (7), two steel discs (8), wind (9) and fixed bar (10), the stainless steel taper type container that taper type container (5) is inner wall smooth, one end of two right cylinders (6) is rotatably installed in respectively in the groove (2-1) of a pillar (2) upper end, the other end of two right cylinders (6) is affixed with two sidewalls of taper type container (5) respectively, taper type container fills up fresh concrete in (5), the center of upper cover (3) and lower cover (4) all has a center pit, and upper cover (3) and lower cover (4) mount cover respectively the two ends up and down at taper type container (5), each pre-buried steel disc (8) of the two ends up and down of fresh concrete, and the position of steel disc (8) is relative with the center pit of upper cover (3) and lower cover (4), two sensors (7) wear respectively and are packed on upper cover (3) and lower cover (4), each sensor (7) is all relative with the center pit of upper cover (3) and lower cover (4), and leave gap between each steel disc (8) and each sensor (7), sensor (7) is eddy displacement sensor, the top of wind (9) along the circumferential direction evenly has four through holes (9-1), wind (9) is packed in one end of right cylinder (6), fixed bar (10) is located on the through hole (9-1) and pillar (2) of wind (9) successively.
2. hand-rail type concrete self-shrinkage measuring device according to claim 1, is characterized in that: two sensors (7) are packed on upper cover (3) and lower cover (4) by a nut respectively.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210049852.0A CN102608298B (en) | 2012-02-29 | 2012-02-29 | Hand-shaking type concrete self-constriction measuring device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210049852.0A CN102608298B (en) | 2012-02-29 | 2012-02-29 | Hand-shaking type concrete self-constriction measuring device |
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| CN102608298A CN102608298A (en) | 2012-07-25 |
| CN102608298B true CN102608298B (en) | 2014-11-05 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| CN109387457A (en) * | 2019-01-03 | 2019-02-26 | 上海建工集团股份有限公司 | A kind of concrete rheological parameter through when monitoring device and method |
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| CN1844850A (en) * | 2006-03-16 | 2006-10-11 | 江苏博特新材料有限公司 | Method and apparatus for testing early self-deformation of concrete |
| CN2857009Y (en) * | 2005-07-13 | 2007-01-10 | 同济大学 | Constrained contraction testing machine for concrete |
| CN200979544Y (en) * | 2006-11-03 | 2007-11-21 | 北京工业大学 | A cement concrete autogenous-shrinkage ratio detector |
| KR100783568B1 (en) * | 2006-10-17 | 2007-12-11 | 강원대학교산학협력단 | Measurement apparatus for autogenous shrinkage of concrete |
| CN101122596A (en) * | 2007-09-04 | 2008-02-13 | 中交四航工程研究院有限公司 | Concrete cracking sensitivity test device and anti-crack ability evaluation method |
| CN201247042Y (en) * | 2008-08-26 | 2009-05-27 | 河海大学 | Device for measuring early age period linear deformation of cement based material |
| CN201569653U (en) * | 2009-12-16 | 2010-09-01 | 上海市建筑科学研究院(集团)有限公司 | Device for measuring self-contractibility rate of cement-based materials |
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2012
- 2012-02-29 CN CN201210049852.0A patent/CN102608298B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2857009Y (en) * | 2005-07-13 | 2007-01-10 | 同济大学 | Constrained contraction testing machine for concrete |
| CN1844850A (en) * | 2006-03-16 | 2006-10-11 | 江苏博特新材料有限公司 | Method and apparatus for testing early self-deformation of concrete |
| KR100783568B1 (en) * | 2006-10-17 | 2007-12-11 | 강원대학교산학협력단 | Measurement apparatus for autogenous shrinkage of concrete |
| CN200979544Y (en) * | 2006-11-03 | 2007-11-21 | 北京工业大学 | A cement concrete autogenous-shrinkage ratio detector |
| CN101122596A (en) * | 2007-09-04 | 2008-02-13 | 中交四航工程研究院有限公司 | Concrete cracking sensitivity test device and anti-crack ability evaluation method |
| CN201247042Y (en) * | 2008-08-26 | 2009-05-27 | 河海大学 | Device for measuring early age period linear deformation of cement based material |
| CN201569653U (en) * | 2009-12-16 | 2010-09-01 | 上海市建筑科学研究院(集团)有限公司 | Device for measuring self-contractibility rate of cement-based materials |
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