CN103063337B - Measuring method of stresses borne by twice-successively-poured concrete at construction joint - Google Patents
Measuring method of stresses borne by twice-successively-poured concrete at construction joint Download PDFInfo
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- CN103063337B CN103063337B CN201210548567.3A CN201210548567A CN103063337B CN 103063337 B CN103063337 B CN 103063337B CN 201210548567 A CN201210548567 A CN 201210548567A CN 103063337 B CN103063337 B CN 103063337B
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Abstract
The invention discloses a measuring method of stresses borne by twice-successively-poured concrete at a construction joint. An oil-sac-type strainometer is installed on the construction joint to measure stress on the construction joint. The measuring method comprises the following steps: 1) after concrete is poured on one side of the construction joint for the first time, the oil-sac-type strainometer and an automatic wireless thermodetector are installed at the construction joint; 2) after the concrete is poured on the other side of construction joint for the second time, indicators measured by the oil-sac-type strainometer are noted every other arranged timing, and are expressed by epsilon 1; 3) temperature change values within arranged time are about afterward poured concrete, automatically measured by the automatic wireless theromodetector, noted and are expressed by delta T; 4) coefficient of thermal expansion of oil of the oil-sac-type strainometer is alpha, temperature strain of the concrete poured for the second time is generated because of changes of hydration heat temperature and is expressed by epsilon 0, and a calculation formula is epsilon 0 = alpha * delta T; 5) actual stress on the construction joint is calculated and is expressed by epsilon, and a calculation formula is epsilon = epsilon 1 - epsilon0.
Description
Technical field
The present invention, about a kind of measuring method of stress, refers in particular to a kind of priority two-step pouring concrete in the measuring method of construction joint place stress.
Background technology
In building-site concrete construction, when the amount of building of a certain structural concrete is larger, conventionally in a certain position of structure, stays and establish construction joint, first pouring construction seam concrete on one side, in a few days or after being at least first pouring concrete final set, then the concrete of pouring construction seam another side.Because the concrete defevent experiment on construction joint both sides is built, the concrete strength of the concrete strength ratio primary concreting in construction joint place is low.Simultaneously at construction joint place concrete due to first after-pouring, the concrete of building for rear time is because hydration heat reason can produce the Swelling and contraction of volume, this cubic deformation meeting forms compressive stress and tension on the interface of construction joint New-old concrete, be exactly construction joint place generation pressure when rear casting concrete heats up particularly, when rear inferior concrete cooling of building, construction joint place stress transfers tension to by compressive stress gradually, when tension is greater than the concrete tensile strength in construction joint place, construction joint will ftracture.The concrete stress size at construction joint place is to measure by vibrating string extensometer at present, but need to carry out several corrections to the reading recording while measuring with vibrating string extensometer, the one, due to vibrating string extensometer housing and the different strain producing of inner vibratory string temperature process, the 2nd, and the strain that produce different from thermal expansion coefficient of concrete of vibrating string extensometer housing, very loaded down with trivial details.
Summary of the invention
Because the problems referred to above the invention provides a kind of priority two-step pouring concrete in the measuring method of construction joint place stress, at described construction joint place, by being installed, measures by an oil sac formula strainometer stress at described construction joint place.
Further, the method comprises the following steps:
1), after the concreting of first building in described construction joint one side, described oil sac formula strainometer and an automated wireless temperature measurer are installed at described construction joint place;
2) after the concreting of described construction joint opposite side after-pouring, every a Preset Time, record the reading that described oil sac formula strainometer measures, use ε
1represent;
3) temperature change value of the concrete of automatically measuring and record after-pouring by described automated wireless temperature measurer in described Preset Time, with Δ, T represents;
4) the oily thermal expansivity of described oil sac formula strainometer is α, calculates the concrete of after-pouring due to the temperature strain that hydration heat temperature variation produces, and uses ε
0represent, computing formula is ε
0=α * Δ T;
5) calculate the actual stress at described construction joint place, with ε, represent, computing formula is ε=ε
1-ε
0.
Further, described Preset Time is 2 hours.
The present invention's priority two-step pouring concrete is in the measuring method of construction joint place stress, while using oil sac formula strainometer to measure construction joint place stress, because the concrete of after-pouring has the process of a hydration heat temperature variation, therefore the oil sac formula strainometer that is embedded in construction joint place also has the process of a corresponding temperature variation, the temperature strain sum that caused by stress-strain and oil sac temperature variation that the stress reading that now oil sac strainometer is read is oil sac, must utilize automated wireless temperature measurer to measure the actual temperature change course of oil sac formula strainometer, thereby be multiplied by with this thermal history the temperature strain that thermal expansivity oily in oil sac obtains oil sac formula strainometer, by the temperature strain that the stress reading of the oil sac formula strainometer read deducts oil sac formula strainometer, could finally obtain accurately again that construction joint place is concrete is really subject to stress-strain.The present invention adopts oil sac formula strainometer, only needs to revise the cubic deformation that in oil sac formula strainometer, oil produces due to thermal expansion, and with respect to vibrating string extensometer, the item of correction will lack, and the accuracy of measurement is higher.
Accompanying drawing explanation
Fig. 1 is that the present invention's priority two-step pouring concrete is at the process flow diagram of the measuring method of construction joint place stress.
Fig. 2 is that the present invention's priority two-step pouring concrete is at the Plane Installation schematic diagram of the oil sac formula strainometer of the measuring method of construction joint place stress.
Fig. 3 is the sectional side view at construction joint place in Fig. 2 of the present invention.
Embodiment
Cooperation, referring to shown in Fig. 1, the invention provides a kind of priority two-step pouring concrete in the measuring method of construction joint place stress, measures the stress at described construction joint place at described construction joint place by an oil sac formula strainometer is installed, and comprises the following steps:
1) coordinate referring to shown in Fig. 2 and Fig. 3, after the concrete 101 of first building in construction joint 10 1 sides is built, prepare pouring construction and stitch before the concrete 102 of 10 opposite side after-pourings, an oil sac formula strainometer 20 and an automated wireless temperature measurer 30 are installed at construction joint 10 places;
2) after the concrete 102 of construction joint 10 opposite side after-pourings is built, every a Preset Time, record the reading that described oil sac formula strainometer 20 measures, use ε
1represent,
3) temperature change value of the concrete 102 of automatically measuring and record after-pouring by described automated wireless temperature measurer 30 in described Preset Time, with Δ, T represents; Preferably, described Preset Time is 2 hours.
4) the oily thermal expansivity of described oil sac formula strainometer 20 is α, calculates the concrete 102 of after-pouring due to the temperature strain that hydration heat temperature variation produces, and uses ε
0represent, computing formula is ε
0=α * Δ T;
5) calculate the actual stress that the temperature strain producing due to hydration heat temperature variation is rejected at described construction joint 10 places, with ε, represent, computing formula is ε=ε
1-ε
0.
The above is only preferred embodiment of the present invention, not the present invention is done to any pro forma restriction, although the present invention discloses as above with preferred embodiment, yet not in order to limit the present invention, any those skilled in the art, within not departing from the scope of technical solution of the present invention, when can utilizing the technology contents of above-mentioned announcement to make a little change or being modified to the equivalent embodiment of equivalent variations, in every case be the content that does not depart from technical solution of the present invention, any simple modification of above embodiment being done according to technical spirit of the present invention, equivalent variations and modification, all still belong in the scope of technical solution of the present invention.
Claims (2)
1. successively two-step pouring concrete, in a measuring method for construction joint place stress, is characterized in that measuring by an oil sac formula strainometer is installed at described construction joint place the stress at described construction joint place, and described measuring method comprises the following steps:
1), after the concreting of first building in described construction joint one side, described oil sac formula strainometer and an automated wireless temperature measurer are installed at described construction joint place;
2) after the concreting of described construction joint opposite side after-pouring, every a Preset Time, record the reading that described oil sac formula strainometer measures, use ε
1represent;
3) temperature change value of the concrete of automatically measuring and record after-pouring by described automated wireless temperature measurer in described Preset Time, with Δ, T represents;
4) the oily thermal expansivity of described oil sac formula strainometer is α, calculates the concrete of after-pouring due to the temperature strain that hydration heat temperature variation produces, and uses ε
0represent, computing formula is ε
0=α * Δ T;
5) calculate the actual stress at described construction joint place, with ε, represent, computing formula is ε=ε
1-ε
0.
2. priority two-step pouring concrete as claimed in claim 1, in the measuring method of construction joint place stress, is characterized in that described Preset Time is 2 hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210548567.3A CN103063337B (en) | 2012-12-17 | 2012-12-17 | Measuring method of stresses borne by twice-successively-poured concrete at construction joint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210548567.3A CN103063337B (en) | 2012-12-17 | 2012-12-17 | Measuring method of stresses borne by twice-successively-poured concrete at construction joint |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103063337A CN103063337A (en) | 2013-04-24 |
| CN103063337B true CN103063337B (en) | 2014-09-10 |
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|---|---|---|---|
| CN201210548567.3A Active CN103063337B (en) | 2012-12-17 | 2012-12-17 | Measuring method of stresses borne by twice-successively-poured concrete at construction joint |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103604387B (en) * | 2013-12-11 | 2016-01-20 | 中国建筑第八工程局有限公司 | Young concrete body of wall overall hydration heat constrained displacement measuring method |
| CN103630084B (en) * | 2013-12-11 | 2017-01-11 | 中国建筑第八工程局有限公司 | Integral constrained deformation measuring method under concrete frame structure seasonal temperature difference action |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5390459A (en) * | 1993-03-31 | 1995-02-21 | Aab Building System Inc. | Concrete form walls |
| CN1120359C (en) * | 2000-04-05 | 2003-09-03 | 深圳职业技术学院 | Method for testing working stress of buildings structure in situ |
| KR100491295B1 (en) * | 2004-11-09 | 2005-05-24 | (주)프론틱스 | Evaluating method of the fracture toughness using the continuous indentation method |
| CN2929716Y (en) * | 2006-05-12 | 2007-08-01 | 郑万山 | Real stress detector for self compensation concrete structure |
| CN101975701B (en) * | 2010-09-10 | 2012-07-04 | 胡少伟 | Concrete fracture test system and test method thereof |
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