CN102269556B - Double-precision-control contraction measuring instrument for regenerated concrete - Google Patents
Double-precision-control contraction measuring instrument for regenerated concrete Download PDFInfo
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- CN102269556B CN102269556B CN 201110118493 CN201110118493A CN102269556B CN 102269556 B CN102269556 B CN 102269556B CN 201110118493 CN201110118493 CN 201110118493 CN 201110118493 A CN201110118493 A CN 201110118493A CN 102269556 B CN102269556 B CN 102269556B
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Abstract
The invention discloses a double-precision-control contraction measuring instrument for regenerated concrete. The double-precision-control contraction measuring instrument for the regenerated concrete comprises a base, wherein two same positioning rods are symmetrically arranged on the base; two same positioning metal sheets are symmetrically arranged between the two positioning rods; a plurality of roller shafts with smooth surfaces are arranged between the two positioning metal sheets; the roller shafts are vertical to a connecting line of the two positioning rods; distances between every two adjacent sliding roller shafts are equal and a roller shaft fixing strip which is parallel to the roller shafts is arranged between the every two adjacent sliding roller shafts; the positioning rods are cylindrical rods of which the upper ends are provided with sheet-shaped components; horizontal strip-shaped sliding chutes are arranged on the sheet-shaped components; dial indicators are arranged in the sheet-shaped components; and the two positioning rods are arranged in the two directional sliding chutes on the base. The measuring instrument can reduce a contraction error caused by self friction to the maximum and the positions of the dial indicators are regulated in three directions at the same time, so that the precision and convenience for contraction measurement of the regenerated concrete are improved and the defect that the conventional instrument is difficult to operate and low in precision is overcome.
Description
Technical field
The present invention relates to a kind of surveying instrument, be specifically related to the two smart controls of a kind of regeneration concrete and shrink measuring instrument.
Background technology
The in good time problem that proposes to solve on the one hand the processing of flood tide building waste of regeneration concrete makes building waste be able to recycle on the other hand again and produces building material, has practiced thrift a large amount of natural resources, has reduced energy consumption.Therefore this environmentally friendly building materials and correlation technique become the focus of present civil engineering work building materials development.Because the regenerated coarse aggregate surface exists in the regeneration concrete cement cementitious body minute aperture and microfracture make regeneration concrete water-intake rate and material self-constriction amount all differ from normal concrete more greatly.And amount of contraction has crucial influence for regeneration concrete structural elements long-term behaviour and permanance, so regeneration concrete contraction measurement just seems particularly important.
Be SP540 type concrete shrinkage measuring instrument and several kinds of disclosed patent equipments at the normal instrument that uses aspect the normal concrete contraction measurement at present.The original intention of these surveying instrument designs is in order to measure normal concrete or high performance concrete self-constriction; But because the regenerated coarse aggregate source is complicated in the regeneration concrete, level of processing is uneven and the existence of congenital cement cementitious body minute aperture and microfracture; Make regeneration concrete differ from normal concrete or high performance concrete more greatly aspect water-intake rate and the amount of contraction that causes; Demonstrate characteristics such as contraction enlivens time length, the punctured position discreteness is big, amount of contraction is inhomogeneous, these physical characteristicss have determined tradition or existing surveying instrument can not be applicable to the measurement of regeneration concrete amount of contraction.Simultaneously, there is certain defective in existing surveying instrument at aspects such as clock gauge contraposition adjusting, self-friction error concealment, initial trueness errors, makes that operating process is numerous and diverse, measurement result is difficult to guarantee design accuracy.
The parts of SP540 concrete shrinkage measuring instrument are many and install that back test specimen centering difficulty is big, precision is low, operation waste time and energy and systematic error big.Also there are a series of problems in several kinds of same quasi-instruments commonly used on metering system in addition: the instrument elder generation that (1) has is clock gauge fixedly; Carry out the contraposition adjusting through moving test specimen with clock gauge, because factors such as test specimen body own wt make the contraposition of test specimen body and clock gauge be difficult to accomplish accurately and complex operation; (2) instrument that has adopts vertical or inclined placement test specimen, because the amount of contraction of test specimen body weight power factor measurement result no longer is self-constriction, but the algebraic sum of self-constriction and gravity effects of creep amount of contraction, such result can not the actual response test result; But though adopt horizontal placement test specimen to eliminate the influence surface of contact that gravity creeps and contact area of ground is excessive, make the measurement result precision not high under the self-friction influence.In order to overcome the defective that horizontal test specimen exists; The patent No. is that the measuring instrument of ZL200720032091.2 adopts steel ball to support to eliminate self-friction at the surface of contact place; But the test duration crosses for a long time because gravity factor; Can make the concrete surface that contacts with steel ball depression occur again, steel ball will lose tumble action this moment; (3) instrument that has adopts single clock gauge to carry out unidirectional measurement; Like notification number is the shrinkage test device that CN200920086077.x announces;, amount of contraction uneven characteristics big to regeneration concrete punctured position discreteness, the initial precision of unidirectional measurement is not high.
Summary of the invention
To defective that exists in the above-mentioned prior art or deficiency; The objective of the invention is to, provide the two smart controls of a kind of regeneration concrete to shrink measuring instrument, this measuring instrument adopts two clock gauges and slip roller bearing; Through being set, oriented chute finely tunes measurement simultaneously; Three direction adjusted control clock gauge positions, improved accuracy and convenience that the regeneration concrete amount of contraction is measured greatly, overcome the defective of existing instrumentation difficulty, low precision.
In order to achieve the above object, the present invention adopts following technical solution:
Measuring instrument is shunk in the two smart controls of a kind of regeneration concrete, comprises base, it is characterized in that, is symmetrical set two identical backstays on the said base, is symmetrical set two identical location sheet metals between said two backstays; Be provided with some roller bearings between said two location sheet metals, said roller bearing is perpendicular to the line between two backstays, and distance equates between per two adjacent slip roller bearings, and the roller bearing fixed strip parallel with the slip roller bearing is set between per two adjacent slip roller bearings.
Said backstay is the flat member that has round bar, and flat member is positioned at the round bar top, and the strip chute of horizontal direction is arranged on the said flat member, in this strip chute clock gauge is installed, and said clock gauge can move along the strip chute in the horizontal direction; Two said backstays are installed in respectively in two oriented chutes on the base; The length direction of these two oriented chutes is consistent with the length direction of base; Backstay can move on base along this oriented chute, and backstay also moves with respect to the base in the vertical direction.
The present invention also comprises following other technologies characteristic:
There is screw thread said backstay lower end, and this backstay is installed in the oriented chute by setscrew nut and clamp nut, and said setscrew nut is positioned at the top of base, and said clamp nut is positioned at the below of base.
Said clock gauge is through being fixed on the strip chute jacking nut.
The xsect of said roller bearing fixed strip is a triangle.
The substructure height of said measuring instrument is 195mm, and width is that 200mm, length are 715mm.
Advantage of the present invention is following:
1) adopt two two-way precision control surveys of clock gauge, the measuring system error is little.
Shrink uneven characteristics for the regeneration concrete test specimen, two ends are provided with the inhomogeneous errors caused of clock gauge measurement the reduction to greatest extent contraction.The clock gauge that can accurately regulate the location is arranged at contraction principal direction two ends at test specimen; Carry out data processing according to following formula; Be not difficult to find out that by formula (1) the more unidirectional measurement gained of bidirectional measurement data variation property is little, precision is high, avoided because big, the inhomogeneous measuring error that causes of amount of contraction of regeneration concrete punctured position discreteness.
Wherein:
is test specimen amount of contraction in interval time, and
is first clock gauge initial reading;
is second clock gauge initial reading;
is first clock gauge reading;
is second clock gauge reading.
2) the present invention adopts two clock gauges to measure simultaneously at the test specimen two ends, and through positioning runner is set on base, the strip chute is set on backstay; Utilize setscrew nut and clamp nut stationary positioned bar; Thereby the design of the locating device of clock gauge is as a whole, can on three directions, adjust the locus of two clock gauges simultaneously, the test process after fixing test specimen need not mobile significantly heavy test specimen; Only need regulate clock gauge; Make the test process high in efficiency and convenience, measure initial error and significantly reduce that the Instrument measuring precision of the one-sided clock gauge of the more existing employing of actual measured results is higher.
3) in susceptor surface roller bearing fixed strip and slip roller bearing are set; Make the existing surface of contact of the measuring instrument of steel ball support that adopts of surface of contact of base and regeneration concrete test specimen become big; It is big that thereby support stiffness becomes; Overcome in the prior art concrete sample because gravity factor, caving in and making steel ball lose the defective of tumble action appears in the concrete surface that contact with steel ball; Simultaneously, the influence that smooth slip roller bearing is reduced friction to greatest extent and brought is convenient to move test specimen, satisfies specifications of surveys and has guaranteed measuring accuracy.
Description of drawings
Fig. 1 is the structural representation of measuring instrument of the present invention.
Fig. 2 is the vertical view of measuring instrument of the present invention.
Fig. 3 is the right side view of measuring instrument of the present invention.
Fig. 4 is the backstay structural representation.
Fig. 5 is the vertical view of base.
Below in conjunction with accompanying drawing and embodiment the present invention is done further and to explain.
Embodiment
Embodiment 1:
Like Fig. 1-shown in Figure 3, measuring instruments are shunk in the two smart controls of regeneration concrete of the present invention, comprise base 1; Be symmetrical set two identical backstays 2 on the base 1; Be symmetrical set two identical location sheet metals 4 between two backstays 2, location sheet metal 4 is used for fixing test specimen, prevents that test specimen is along the base longitudinal sliding motion; It is fixed that two distances of location between the sheet metal are come according to the length of concrete test specimen, this distance should with the equal in length of institute's test block; Be provided with some roller bearings 5 between two location sheet metals 4; Roller bearing 5 is perpendicular to the line between two backstays 2; Distance equates between per two adjacent slip roller bearings 5; The roller bearing fixed strip 10 parallel with slip roller bearing 5 is set between per two adjacent slip roller bearings 5, and the xsect of roller bearing fixed strip 10 is a triangle.
Roller bearing fixed strip 10 is the baffling devices that are provided with for anti-sliding stop roller bearing 5 displacements are excessive, in the actual fabrication process, guarantee the roller bearing diameter of section greater than roller bearing fixed strip vertical height, causes frictional error to prevent that test specimen from contacting with the roller bearing fixed strip.
As shown in Figure 4; Backstay 2 is for having the flat member of round bar; Flat member is positioned at the round bar top, and the strip chute 6 of horizontal direction is arranged on the flat member, in this strip chute 6 clock gauge 3 is installed; Clock gauge 3 is through being fixed in the strip chute 6 jacking nut 8, and clock gauge 3 can move along strip chute 6 in the horizontal direction; There is screw thread backstay 2 lower ends; Two backstays 2 are installed in two oriented chutes 11 on the base 1 by setscrew nut 7 and clamp nut 9 respectively; The length direction of these two oriented chutes (11) is consistent with the length direction of base (1); Said setscrew nut 7 is positioned at the top of base 1, and said clamp nut 9 is positioned at the below of base 1.Backstay 2 can move on base 1 along this oriented chute 11, and backstay 2 can move with respect to the base in the vertical direction.
As shown in Figure 5, base 1 highly is 195mm, and width is that 200mm, length are 715mm; Backstay 2 height 120mm; Strip chute 6 length 50mm, width 15mm; Location sheet metal 4 is chosen length 200mm, height 30mm, the elasticity preferred metal sheet of thickness 1mm, two location sheet metal 4 clear spacing 515mm; Roller bearing 5 diameter 50mm, xsect are that the xsect of roller bearing fixed strip 10 is a triangle, its vertical height 25mm; Oriented chute 11 length 40mm, width 20mm, the oriented chute two ends are arc section, this arc section diameter 20mm; Setscrew nut 7 is chosen the hexagonal nut that model is M20; Clamp nut 9 is chosen the hexagonal nut that model is M20.
Test material preparation:
According to code requirement, it is standard specimen that test specimen adopts 100mm * 100mm * 515mm prism test specimen.It is some to prepare 30mm * 30mm * 3mm sheet glass after the moulding, and removing surface is clean, after drying glass sheet is tightly pasted on test specimen with AB glue, and glass sheet all should be pasted in the two ends of test specimen.To guarantee that glass sheet is smooth when pasting glass sheet, firmly.
The measurement of test specimen:
According to " Standard for test methods of longterm performance and durability of ordinary concrete " requirement; Test specimen to be measured should take out and move into immediately thermostatic constant wet chamber from standard curing room in the 3 day length of time (when ready-mixed concrete adds water, counting) and measure its initial length, after this should measure its distortion by the time interval of 1,3,7,14,28,45,60,90,120,150,180 day (counting from moving into thermostatic constant wet chamber) at least.Confirm the direction of measurement of test specimen earlier, and marked, the each measurement all surveyed by the direction of confirming, guarantees that point position is constant.
Measure beginning, directly test specimen to be measured is placed on two bases 1 between the retainer spring sheet 4, guarantee to locate sheet metal 4 the test specimen jam-packed; Afterwards; Regulate the locus of confirming two clock gauges respectively from the location of three directions: the setscrew nut 7 on (1) positioning of rotating bar 2, backstay 2 is vertically moved up and down, drive the sustained height position that clock gauge 3 arrives measuring point; When two clock gauges 3 all arrive the height and position of measuring point; Accomplish first location, that is to say the location on backstay 2 short transverses, this moment, setscrew nut 7 was stuck in backstay 2 in the oriented chute 11 of base 1; (2) move two backstays 2 along the oriented chute on the base 1 11, when treating that two clock gauges 2 just in time touch the test specimen surface, tighten clamp nut 9, clamp nut 9 is fixed on backstay 2 with setscrew nut 7, accomplishes second location; (3) regulate two clock gauges 3, it is moved along the strip chute 6 that belongs to separately, when treating that two clock gauges 3 all arrive measuring point separately, accomplish the 3rd location.
After accomplish the location of three directions, writing down the numerical value that two clock gauges show, promptly is the initial value of two clock gauges, and accomplish for the first time and measure this moment.Next the initial value before the value that at every turn measures and this time are measured subtracts each other the shrinkage value that promptly obtains test specimen.Table 1 is the experimental test result.
In above-mentioned test process, do not receive slight disturbing influence after clock gauge and test specimen are fixing, in the measurement of long period, show the advantage of stability and good integrity.
The experimental test result of table 1 measuring instrument
Remarks: x% representes regenerated coarse aggregate replacement rate in (1) test specimen title, for example the test specimen of 50% expression regeneration concrete replacement rate 50%; (2) clock gauge 1, clock gauge 2 are represented two clock gauges that the present invention adopts respectively; The clock gauge real time data that read when representing Y days on-test in (3) Y days, for example the clock gauge data of expression in the 7th day record during the 7th day on-test; (4) the reading unit of clock gauge 1, clock gauge 2 is millimeter mm.
Measurement and Data Processing are given an example: with " 0% test specimen 1 " is example; In four day interval time of the 3rd day to the 7th day, the amount of contraction of test specimen is
; The clock gauge reading was an initial reading in the 3rd day; Clock gauge 1 reading value is
, and clock gauge 2 reading values are
; The clock gauge reading was an initial reading in the 7th day; Clock gauge 1 reading value is
, and clock gauge 2 reading values are
; In above-mentioned data substitution formula (1)
, calculate the amount of contraction
=(0.795+0.382)-(0.760+0.361)=0.056 of this test specimen in 4 days interval time.By that analogy, can obtain at predetermined distance in the time, specify test specimen amount of contraction Changing Pattern and respective value.
Claims (5)
1. measuring instrument is shunk in the two smart controls of regeneration concrete; Comprise base (1); It is characterized in that, be symmetrical set two identical backstays (2) on the said base (1), be symmetrical set two identical location sheet metals (4) between two said backstays (2); Be provided with some slip roller bearings (5) between two said location sheet metals (4); Said slip roller bearing (5) is perpendicular to the line between two backstays (2); Distance equates between per two adjacent slip roller bearings (5), and the roller bearing fixed strip (10) parallel with slip roller bearing (5) is set between per two adjacent slip roller bearings (5);
Said backstay (2) is for having the flat member of round bar; Flat member is positioned at the round bar top; The strip chute (6) that horizontal direction is arranged on the said flat member; In this strip chute (6) clock gauge (3) is installed, this clock gauge (3) can move along strip chute (6) in the horizontal direction; Two said backstays (2) are installed in respectively in two oriented chutes (11) on the base (1); The length direction of these two oriented chutes (11) is consistent with the length direction of base (1); Backstay (2) can move along oriented chute (11), and backstay (2) can also move with respect to base (1) in the vertical direction.
2. measuring instrument is shunk in the two smart controls of regeneration concrete as claimed in claim 1; It is characterized in that; There is screw thread said backstay (2) lower end; This backstay (2) is installed in the oriented chute (11) by setscrew nut (7) and clamp nut (9), and said setscrew nut (7) is positioned at the top of base (1), and said clamp nut (9) is positioned at the below of base (1).
3. measuring instrument is shunk in the two smart controls of regeneration concrete as claimed in claim 1, it is characterized in that said clock gauge (3) is through being fixed on the strip chute (6) jacking nut (8).
4. measuring instrument is shunk in the two smart controls of regeneration concrete as claimed in claim 1, it is characterized in that the xsect of said roller bearing fixed strip (10) is a triangle.
5. measuring instrument is shunk in the two smart controls of regeneration concrete as claimed in claim 1, it is characterized in that the height of said base (1) is 195mm, and width is 200mm, and length is 715mm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110118493 CN102269556B (en) | 2011-05-09 | 2011-05-09 | Double-precision-control contraction measuring instrument for regenerated concrete |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110118493 CN102269556B (en) | 2011-05-09 | 2011-05-09 | Double-precision-control contraction measuring instrument for regenerated concrete |
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| CN102269556A CN102269556A (en) | 2011-12-07 |
| CN102269556B true CN102269556B (en) | 2012-12-19 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102589401B (en) * | 2012-02-17 | 2014-04-09 | 武汉理工大学 | Device for detecting lateral deformation of cement-based material |
| CN103760327A (en) * | 2014-01-21 | 2014-04-30 | 深圳大学 | Concrete shrinkage measuring instrument |
| CN105180745A (en) * | 2015-10-10 | 2015-12-23 | 中国电建集团贵阳勘测设计研究院有限公司 | Sliding concrete prism test alkali activity micrometer |
| 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 |
| CN106526147B (en) * | 2016-11-30 | 2019-06-25 | 东南大学 | A kind of device and method that the expansion character measuring mortar or concrete under the conditions of vertical half soaks measures |
| CN110455169B (en) * | 2019-08-06 | 2021-04-23 | 深圳市市政工程总公司 | Material shrinkage deformation testing method for beam type test piece |
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|---|---|---|---|---|
| US5105552A (en) * | 1987-09-09 | 1992-04-21 | Institut Superieur D'etat De Surface (I S E S) | Procedure and sliding support for a profilometer |
| CN2532488Y (en) * | 2002-04-12 | 2003-01-22 | 陈清志 | Concrete expansion/contraction tester |
| CN201041562Y (en) * | 2007-06-08 | 2008-03-26 | 西北民族大学 | Concrete shrinking measurer |
| CN201417271Y (en) * | 2009-05-31 | 2010-03-03 | 中建商品混凝土有限公司 | Concrete expansion and contraction measuring device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008232926A (en) * | 2007-03-22 | 2008-10-02 | Jtekt Corp | Device for measuring of traveling amount of rolling motion object |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5105552A (en) * | 1987-09-09 | 1992-04-21 | Institut Superieur D'etat De Surface (I S E S) | Procedure and sliding support for a profilometer |
| CN2532488Y (en) * | 2002-04-12 | 2003-01-22 | 陈清志 | Concrete expansion/contraction tester |
| CN201041562Y (en) * | 2007-06-08 | 2008-03-26 | 西北民族大学 | Concrete shrinking measurer |
| CN201417271Y (en) * | 2009-05-31 | 2010-03-03 | 中建商品混凝土有限公司 | Concrete expansion and contraction measuring device |
Non-Patent Citations (1)
| Title |
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| JP特开2008-232926A 2008.10.02 |
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