CN104865136A - Testing device for strain measurement of steel strand at ultralow temperature - Google Patents
Testing device for strain measurement of steel strand at ultralow temperature Download PDFInfo
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- CN104865136A CN104865136A CN201510263869.XA CN201510263869A CN104865136A CN 104865136 A CN104865136 A CN 104865136A CN 201510263869 A CN201510263869 A CN 201510263869A CN 104865136 A CN104865136 A CN 104865136A
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- strand wires
- rod iron
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Abstract
The invention discloses a testing device for strain measurement of a steel strand at the ultralow temperature. An ultralow-temperature environmental cabinet comprises a top plate, a bottom plate, a front plate, a rear plate, a left side plate and a right side plate; a steel strand test piece is fixed with the environmental cabinet through a through hole of the top plate and a through hole of the bottom plate, a steel bar A and a steel bar B are arranged in through holes penetrating through upper parts and lower parts of the left side plate and the right side plate and are fixed on the test piece respectively; a quartz bar A and a quartz bar B are arranged on the left side plate and the right side plate through the steel bar A and the steel bar B, and a dial gauge A and a dial gauge B are arranged at the upper end of the quartz A and the upper end of the quartz bar B respectively so as to constitute a strain lead-out measurement device; a liquid nitrogen inlet is formed in the upper part of the rear plate, so that the constant temperature is kept in the test process. The testing device is simple in structure and convenient to operate, and the test can be completed smoothly even in the environment at the ultralow temperature lower than subzero 80 DEG C.
Description
Technical field
The invention belongs to a kind of test unit of building structure, the test unit of particularly steel strand wires strain measurement under a kind of ultralow temperature.
Background technology
In the design of building structure, often need to study the performance of steel strand wires under low temperature even ultralow temperature, for design provides foundation, so the strain at low ambient temperatures of measurement steel strand wires is requisite often.
Some research needs when monitor strain to load steel strand wires test specimen, and some does not then need, as measured steel strand prestress loss test.At present, mostly the method for strand structure strain in existing measurement low temperature environment and device are for normal temperature environment, and measurement mechanism working condition in low temperature environment is very unstable, and some even can lose efficacy, and causes test normally not carry out.
Summary of the invention
The object of the invention is to the shortcoming overcoming above-mentioned prior art, a kind of test unit of steel strand wires strain measurement under ultralow temperature is provided.Test component is placed in ultra-low temperature surroundings case of the present invention by this device, then realizes measuring the extraction of component strain by the extraction measurement mechanism outside rod iron and environmental cabinet.
The present invention is achieved by following technical solution.
Steel strand wires strain measurement test unit under a kind of ultralow temperature, comprises ultra-low temperature surroundings case and measurement mechanism is drawn in strain, and it is characterized in that, described ultra-low temperature surroundings case is made up of top board 1, base plate 2, header board 3, rear plate 4, left plate 5 and right plate 6; The center of top board 1 and base plate 2 arranges porose E11 and hole F12 accordingly, and the midline position of the top and bottom of left plate 5 and right plate 6 is respectively arranged with hole A7, hole B8 and hole C9, hole D10, and the top of rear plate 4 is provided with liquid nitrogen import 13;
The hole E11 and the hole F12 that run through top board 1 and base plate 2 are provided with steel strand wires test specimen 32, steel strand wires test specimen 32 and top board 1 are fixed by steel padding A26, anchor clamp A28 at E11 place, hole; The hole A7 and the hole C9 that run through left plate 5 and right plate 6 are provided with rod iron A14, and the hole B8 and the hole D10 that run through left plate 5 and right plate 6 are provided with rod iron B15, and rod iron A14 and rod iron B15 is separately fixed on steel strand wires test specimen 32 by cross clamp A16 and cross clamp B17;
Quartz pushrod A22 and quartz pushrod B23 is respectively arranged with in the outside of left plate 5 and right plate 6; Quartz pushrod A22 is fixed on left plate 5 outer end of rod iron A14 and rod iron B15 by cross clamp E20 and cross clamp C18; Quartz pushrod B23 is fixed on right plate 6 outer end of rod iron A14, rod iron B15 by the cross clamp D19 of cross clamp F21; The upper end of the quartz pushrod A22 of left plate 5 side is provided with clock gauge A24, the quartz pushrod B23 upper end of right plate 6 side is provided with clock gauge B25;
Quartz pushrod A22, quartz pushrod B23 and clock gauge A24, clock gauge B25 form strain and draw measurement mechanism.
The top board 1 of described ultra-low temperature surroundings case, base plate 2, header board 3, rear plate 4, left plate 5 and right plate 6 are polyurethane foam board, adopt glass cement to bond, form an entirety, but header board 3 give over to last installation.
The aperture width of hole A7, the hole B8 of described left plate 5 and right plate 6 and hole C9, hole D10 is slightly larger than the diameter of rod iron A14 and rod iron B15, and the upper and lower edge of hole respectively higher than, lower than the upper and lower edge 4 ~ 5mm of rod iron, and adopt low temperature seal cream to fill the gap of hole and rod iron to realize the sealing of ultra-low temperature surroundings case.
When steel strand wires test specimen 32 needs to load external force test, the surrounding of ultra-low temperature surroundings case is provided with reaction frame 31, and reaction frame 31 is made up of upper and lower, left and right four plate, and the center of upper plate and lower plate is respectively arranged with the through hole that can run through for steel strand wires test specimen 32; After steel strand wires test specimen 32 is through the hole E11 of ultra-low temperature surroundings roof box 1 and through the upper plate through hole of reaction frame 31, by steel padding A26, anchor clamp A28, steel strand wires test specimen 32 and upper plate are fixed; After steel strand wires test specimen 32 is through the hole F12 of ultra-low temperature surroundings box plate 2 and through the lower plate through hole of reaction frame 31, by lifting jack 30, steel padding B27, anchor clamp B29, steel strand wires test specimen 32 and lower plate are fixed.
Structure of the present invention is simple, easy to operate, to all applicable with or without loading the steel strand wires strain measurement at low temperatures needed; Can be test component and metastable low temperature environment is provided, and surveying instrument can not be subject to the impact of low temperature environment, no matter be at general low temperature environment or lower than in the ultra-low temperature surroundings of-80 DEG C, can test smoothly, achieve at low ambient temperatures to the strain measurement of steel strand wires test specimen.
Accompanying drawing explanation
Fig. 1 is the structural representation of the ultra-low temperature surroundings case of steel strand wires strain measurement test unit under ultralow temperature of the present invention;
Fig. 2 is the structural representation of steel strand wires strain measurement test unit under ultralow temperature of the present invention;
Fig. 3 is the structural representation of hole A7, hole B8, hole C9, hole D10; ,
Fig. 4 is the 1-1 sectional view of Fig. 2;
Fig. 5 is the left view of Fig. 2;
Fig. 6 is the structural representation of steel strand wires strain measurement test unit under ultralow temperature when needing loading.
Reference numeral of the present invention is as follows:
1---top board 2---base plate
3---header board 4---rear plate
5---left plate 6---right plate
7---hole A 8---hole B
9---hole C 10---hole D
11---hole E 12---hole F
13---liquid nitrogen import 14---rod iron A
15---rod iron B 16---cross clamp A
17---cross clamp B 18---cross clamp C
19---cross clamp D 20---cross clamp E
21---cross clamp F 22---quartz pushrod A
23---quartz pushrod B 24---clock gauge A
25---clock gauge B 26---steel padding A
27---steel padding B 28---anchor clamp A
29---anchor clamp B 30---lifting jack
31---reaction frame 32---steel strand wires test specimen
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
Steel strand wires strain measurement test unit under ultralow temperature of the present invention, comprises ultra-low temperature surroundings case and measurement mechanism is drawn in strain.
See Fig. 1, ultra-low temperature surroundings case is made up of 6 pieces of polyurethane foam boards altogether, comprises top board 1, base plate 2, header board 3, rear plate 4, left plate 5 and right plate 6; Adopt glass cement to bond, form an entirety, but header board 3 gives over to last installation.
Porose E11 and hole F12 is set accordingly in the center of top board 1 and base plate 2, is respectively arranged with hole A7, hole B8 and hole C9, hole D10 at the midline position of the top and bottom of left plate 5 and right plate 6.
The top of rear plate 4 is provided with liquid nitrogen import 13, is connected with the refrigeration plant of outside.
See Fig. 2, the hole E11 and the hole F12 that run through top board 1 and base plate 2 are provided with steel strand wires test specimen 32, steel strand wires test specimen 32 and top board 1 are fixed by steel padding A26, anchor clamp A28 at E11 place, hole; The hole A7 and the hole C9 that run through left plate 5 and right plate 6 are provided with rod iron A14, and the hole B8 and the hole D10 that run through left plate 5 and right plate 6 are provided with rod iron B15, and rod iron A14 and rod iron B15 is separately fixed on steel strand wires test specimen 32 by cross clamp A16 and cross clamp B17;
Quartz pushrod A22 and quartz pushrod B23 is respectively arranged with in the outside of left plate 5 and right plate 6; Quartz pushrod A22 is fixed on left plate 5 outer end of rod iron A14 and rod iron B15 by cross clamp E20 and cross clamp C18; Quartz pushrod B23 is fixed on right plate 6 outer end of rod iron A14, rod iron B15 by the cross clamp D19 of cross clamp F21; The upper end of the quartz pushrod A22 of left plate 5 side is provided with clock gauge A24, the quartz pushrod B23 upper end of right plate 6 side is provided with clock gauge B25;
Quartz pushrod A22, quartz pushrod B23 and clock gauge A24, clock gauge B25 form strain and draw measurement mechanism.
Hole A7, the hole B8 of left plate 5 and right plate 6 and hole C9, hole D10, its aperture width is slightly larger than the diameter of rod iron A14 and rod iron B15, and the upper and lower edge of hole respectively higher than, lower than the upper and lower edge 4 ~ 5mm of rod iron, and adopt low temperature seal cream to fill the gap of hole and rod iron to realize the sealing (referring to Fig. 3) of ultra-low temperature surroundings case.Fig. 4 is the 1-1 sectional view of Fig. 2, the as seen vertical structure of this test unit.Fig. 5 is the left view of Fig. 2, and its right TV structure claims in contrast.
Above-mentioned test unit is the apparatus structure to not needing when carrying out load test.Before test, steel strand wires test specimen 32 is put into environmental chamber at low temperature from header board 3 position, steel strand wires test specimen 32 is fixed through hole E11, steel padding A26 and anchor clamp A28 and top board 1; The bottom of steel strand wires test specimen 32 is through hole F12; Fixed at steel strand wires test specimen 32 section to be measured and rod iron A14, rod iron B15 by cross clamp A16 and cross clamp B17 subsequently, hole A7, hole B8 and hole C9 that rod iron A14 and rod iron B15 reserves through left plate 5 and right plate 6, hole D10, between reserving hole rod iron corresponding to it, smear low temperature seal cream, and make low temperature seal cream fill up space between hole and quartz pushrod; Quartz pushrod A22, the quartz pushrod B23 of the outer arranged on left and right sides of insulation can install clock gauge A24 and clock gauge B25; Finally, liquid nitrogen (gas nitrogen) efferent duct is stretched into liquid nitrogen import 13, now can lower the temperature by hydrojet nitrogen (gas nitrogen), to be achieved require temperature after, liquid nitrogen (gas nitrogen) is sprayed speed and turns down, then start test.In process of the test, by controlling the ejection speed of liquid nitrogen (gas nitrogen), maintaining the temperature of environmental cabinet inside, making inner maintenance constant temperature.
When steel strand wires test specimen 32 needs to load external force test, the surrounding of ultra-low temperature surroundings case is provided with reaction frame 31, and reaction frame 31 is made up of upper and lower, left and right four plate, and the center of upper plate and lower plate is respectively arranged with the through hole that can run through for steel strand wires test specimen 32; After steel strand wires test specimen 32 upper end is through the hole E11 of ultra-low temperature surroundings roof box 1 and through the upper plate through hole of reaction frame 31, by steel padding A26, anchor clamp A28, steel strand wires test specimen 32 and upper plate are fixed; After steel strand wires test specimen 32 lower end is through the hole F12 of ultra-low temperature surroundings box plate 2 and through the lower plate through hole of reaction frame 31, by lifting jack 30, steel padding B27, anchor clamp B29, steel strand wires test specimen 32 and lower plate are fixed.Its experimentation is identical with the process of the test not loading external force.
Claims (4)
1. steel strand wires strain measurement test unit under a ultralow temperature, comprise ultra-low temperature surroundings case and strain extraction measurement mechanism, it is characterized in that, described ultra-low temperature surroundings case is made up of top board (1), base plate (2), header board (3), rear plate (4), left plate (5) and right plate (6); The center of top board (1) and base plate (2) arranges porose E (11) and hole F (12) accordingly, the midline position of the top and bottom of left plate (5) and right plate (6) is respectively arranged with hole A (7), hole B (8) and hole C (9), hole D (10), and the top of rear plate (4) is provided with liquid nitrogen import (13);
The hole E (11) and the hole F (12) that run through top board (1) and base plate (2) are provided with steel strand wires test specimen (32), steel strand wires test specimen (32) and top board (1) are fixed by steel padding A (26), anchor clamp A (28) at hole E (11) place; The hole A (7) and the hole C (9) that run through left plate (5) and right plate (6) are provided with rod iron A (14), the hole B (8) and the hole D (10) that run through left plate (5) and right plate (6) are provided with rod iron B (15), and rod iron A (14) and rod iron B (15) is separately fixed on steel strand wires test specimen (32) by cross clamp A (16) and cross clamp B (17);
Quartz pushrod A (22) and quartz pushrod B (23) is respectively arranged with in the outside of left plate (5) and right plate (6); Quartz pushrod A (22) is fixed on left plate (5) outer end of rod iron A (14) and rod iron B (15) by cross clamp E (20) and cross clamp C (18); Quartz pushrod B (23) is fixed on right plate (6) outer end of rod iron A (14), rod iron B (15) by the cross clamp D (19) of cross clamp F (21); The upper end of the quartz pushrod A (22) of left plate (5) side is provided with clock gauge A (24), quartz pushrod B (23) upper end of right plate (6) side is provided with clock gauge B (25);
Measurement mechanism is drawn in quartz pushrod A (22), quartz pushrod B (23) and clock gauge A (24), the strain of clock gauge B (25) composition.
2. steel strand wires strain measurement test unit under ultralow temperature according to claim 1, it is characterized in that, the top board (1) of described ultra-low temperature surroundings case, base plate (2), header board (3), rear plate (4), left plate (5) and right plate (6) are polyurethane foam board, glass cement is adopted to bond, form an entirety, but header board (3) gives over to last installation.
3. steel strand wires strain measurement test unit under ultralow temperature according to claim 1, it is characterized in that, the aperture width of hole A (7), the hole B (8) of described left plate (5) and right plate (6) and hole C (9), hole D (10) is slightly larger than the diameter of rod iron A (14) and rod iron B (15), and the upper and lower edge of hole respectively higher than, lower than the upper and lower edge 4 ~ 5mm of rod iron, and adopt low temperature seal cream to fill the gap of hole and rod iron to realize the sealing of ultra-low temperature surroundings case.
4. steel strand wires strain measurement test unit under ultralow temperature according to claim 1, it is characterized in that, when steel strand wires test specimen (32) needs to load external force test, the surrounding of ultra-low temperature surroundings case is provided with reaction frame (31), reaction frame (31) is made up of upper and lower, left and right four plate, and the center of upper plate and lower plate is respectively arranged with the through hole that can run through for steel strand wires test specimen (32); After steel strand wires test specimen (32) is through the hole E (11) of ultra-low temperature surroundings roof box (1) and through the upper plate through hole of reaction frame (31), by steel padding A (26), anchor clamp A (28), steel strand wires test specimen (32) and upper plate are fixed; After steel strand wires test specimen (32) is through the hole F (12) of ultra-low temperature surroundings box plate (2) and through the lower plate through hole of reaction frame (31), by lifting jack (30), steel padding B (27), anchor clamp B (29), steel strand wires test specimen (32) and lower plate are fixed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510263869.XA CN104865136A (en) | 2015-05-21 | 2015-05-21 | Testing device for strain measurement of steel strand at ultralow temperature |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510263869.XA CN104865136A (en) | 2015-05-21 | 2015-05-21 | Testing device for strain measurement of steel strand at ultralow temperature |
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| CN104865136A true CN104865136A (en) | 2015-08-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510263869.XA Pending CN104865136A (en) | 2015-05-21 | 2015-05-21 | Testing device for strain measurement of steel strand at ultralow temperature |
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Cited By (2)
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| CN109030212A (en) * | 2018-08-02 | 2018-12-18 | 西安建筑科技大学 | A kind of air-supported membrane structure corner Deformation Observation experimental rig |
| CN109780980A (en) * | 2019-03-28 | 2019-05-21 | 洛阳理工学院 | A kind of mechanical line strain measuring device |
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| CN109780980A (en) * | 2019-03-28 | 2019-05-21 | 洛阳理工学院 | A kind of mechanical line strain measuring device |
| CN109780980B (en) * | 2019-03-28 | 2023-09-12 | 洛阳理工学院 | Mechanical type line strain measurement device |
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Application publication date: 20150826 |