CN103063337A - 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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- CN103063337A CN103063337A CN2012105485673A CN201210548567A CN103063337A CN 103063337 A CN103063337 A CN 103063337A CN 2012105485673 A CN2012105485673 A CN 2012105485673A CN 201210548567 A CN201210548567 A CN 201210548567A CN 103063337 A CN103063337 A CN 103063337A
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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 refers in particular to a kind of priority two-step pouring concrete in the measuring method of construction joint place stress about a kind of measuring method of stress.
Background technology
In the building-site concrete construction, when the amount of building of a certain structural concrete is larger, usually stays in a certain position of structure 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, pouring construction stitches the concrete of another side again.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 because first after-pouring, the concrete of building for rear time can produce the Swelling and contraction of volume owing to the hydration heat reason, this cubic deformation meeting forms compressive stress and tension at the interface of construction joint New-old concrete, be exactly construction joint place generation pressure when rear casting concrete heats up particularly, construction joint place stress transfers tension to by compressive stress gradually when rear inferior concrete cooling of building, when tension during 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 that records when measuring with vibrating string extensometer, the one, owing to vibrating string extensometer housing and the different strain that produces 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, by being installed, measures by an oil sac formula strainometer stress at described construction joint place at described construction joint place.
Further, the method may further comprise the steps:
1) after the concreting that described construction joint one side is built first is complete, 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 is complete, record the reading that described oil sac formula strainometer measures every a Preset Time, use ε
1Expression;
3) by the automatic temperature change value of concrete in described Preset Time of measuring and recording after-pouring of described automated wireless temperature measurer, T represents with Δ;
4) thermal expansivity of the oil of described oil sac formula strainometer is α, calculates the concrete of after-pouring owing to the temperature strain that the hydration heat temperature variation produces, and uses ε
0Expression, computing formula is ε
0=α * Δ T;
5) actual stress at the described construction joint of calculating place represents with ε, and 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, when 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 the construction joint place also has the process of a corresponding temperature variation, the stress reading that this moment, the oil sac strainometer was read is the temperature strain sum that caused by stress-strain and oil sac temperature variation of oil sac, must utilize the automated wireless temperature measurer to measure the actual temperature change course of oil sac formula strainometer, thereby obtain the temperature strain of oil sac formula strainometer with the thermal expansivity that this thermal history multiply by in the oil sac oil, the temperature strain that deducts oil sac formula strainometer with the stress reading of the oil sac formula strainometer of reading again could obtain finally accurately that the construction joint place is concrete really to be subjected to stress-strain.The present invention adopts oil sac formula strainometer, only needs to revise the cubic deformation that oil produces owing to thermal expansion in the oil sac formula strainometer, and with respect to vibrating string extensometer, the item of correction will lack, and the accuracy of measurement is higher.
Description of drawings
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 among Fig. 2 of the present invention.
Embodiment
Cooperation the invention provides a kind of priority two-step pouring concrete in the measuring method of construction joint place stress referring to shown in Figure 1, measures the stress at described construction joint place by an oil sac formula strainometer is installed at described construction joint place, may further comprise the steps:
1) cooperates referring to Fig. 2 and shown in Figure 3, the concrete 101 that construction joint 10 1 sides are built first build complete after, before the preparation pouring construction stitches 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) the concrete 102 of construction joint 10 opposite side after-pourings build complete after, record the reading that described oil sac formula strainometer 20 measures every a Preset Time, use ε
1Expression,
3) by the described automated wireless temperature measurer 30 automatic temperature change value of concrete 102 in described Preset Time of measuring and recording after-pouring, T represents with Δ; Preferably, described Preset Time is 2 hours.
4) thermal expansivity of the oil of described oil sac formula strainometer 20 is α, calculates the concrete 102 of after-pouring owing to the temperature strain that the hydration heat temperature variation produces, and uses ε
0Expression, computing formula is ε
0=α * Δ T;
5) calculate the actual stress that the temperature strain that produces owing to the hydration heat temperature variation is rejected at described construction joint 10 places, represent with ε, computing formula is ε=ε
1-ε
0
The above only is preferred embodiment of the present invention, be not that the present invention is done any pro forma restriction, although the present invention discloses as above with preferred embodiment, yet be not to limit the present invention, any those skilled in the art, in the scope that does not break away from technical solution of the present invention, when the technology contents that can utilize above-mentioned announcement is made a little change or is modified to the equivalent embodiment of equivalent variations, in every case be the content that does not break away from technical solution of the present invention, any simple modification that foundation technical spirit of the present invention is done above embodiment, equivalent variations and modification all still belong in the scope of technical solution of the present invention.
Claims (3)
- One kind successively the two-step pouring concrete it 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 in the measuring method of construction joint place stress.
- 2. priority two-step pouring concrete as claimed in claim 1 is characterized in that further comprising the steps in the measuring method of construction joint place stress:1) after the concreting that described construction joint one side is built first is complete, 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 is complete, record the reading that described oil sac formula strainometer measures every a Preset Time, use ε 1Expression;3) by the automatic temperature change value of concrete in described Preset Time of measuring and recording after-pouring of described automated wireless temperature measurer, T represents with Δ;4) thermal expansivity of the oil of described oil sac formula strainometer is α, calculates the concrete of after-pouring owing to the temperature strain that the hydration heat temperature variation produces, and uses ε 0Expression, computing formula is ε 0=α * Δ T;5) actual stress at the described construction joint of calculating place represents with ε, and computing formula is ε=ε 1-ε 0
- 3. priority two-step pouring concrete as claimed in claim 2 is characterized in that in the measuring method of construction joint place stress 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 |
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| 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 |
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| Publication Number | Publication Date |
|---|---|
| CN103063337A true CN103063337A (en) | 2013-04-24 |
| CN103063337B 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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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103604387A (en) * | 2013-12-11 | 2014-02-26 | 中国建筑第八工程局有限公司 | Measurement method for whole hydration heat constrained displacement of newly-poured concrete wall |
| CN103630084A (en) * | 2013-12-11 | 2014-03-12 | 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 |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1120359A (en) * | 1993-03-31 | 1996-04-10 | Aab建筑***有限公司 | Concrete form walls |
| CN1266182A (en) * | 2000-04-05 | 2000-09-13 | 深圳职业技术学院 | Method for testing working stress of buildings structure in situ |
| CN2929716Y (en) * | 2006-05-12 | 2007-08-01 | 郑万山 | Real stress detector for self compensation concrete structure |
| US20080010031A1 (en) * | 2004-11-09 | 2008-01-10 | Frontics, Inc. | Evaluating Method of the Fracture Toughness Using the Continuous Indentation Method |
| CN101975701A (en) * | 2010-09-10 | 2011-02-16 | 胡少伟 | Concrete fracture test system and test method thereof |
-
2012
- 2012-12-17 CN CN201210548567.3A patent/CN103063337B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1120359A (en) * | 1993-03-31 | 1996-04-10 | Aab建筑***有限公司 | Concrete form walls |
| CN1266182A (en) * | 2000-04-05 | 2000-09-13 | 深圳职业技术学院 | Method for testing working stress of buildings structure in situ |
| US20080010031A1 (en) * | 2004-11-09 | 2008-01-10 | Frontics, Inc. | 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 |
| CN101975701A (en) * | 2010-09-10 | 2011-02-16 | 胡少伟 | Concrete fracture test system and test method thereof |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103604387A (en) * | 2013-12-11 | 2014-02-26 | 中国建筑第八工程局有限公司 | Measurement method for whole hydration heat constrained displacement of newly-poured concrete wall |
| CN103630084A (en) * | 2013-12-11 | 2014-03-12 | 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 |
| 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 |
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| CN103063337B (en) | 2014-09-10 |
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