CN103630084A - Integral constrained deformation measuring method under concrete frame structure seasonal temperature difference action - Google Patents
Integral constrained deformation measuring method under concrete frame structure seasonal temperature difference action Download PDFInfo
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- CN103630084A CN103630084A CN201310671223.6A CN201310671223A CN103630084A CN 103630084 A CN103630084 A CN 103630084A CN 201310671223 A CN201310671223 A CN 201310671223A CN 103630084 A CN103630084 A CN 103630084A
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Abstract
The invention discloses an integral constrained deformation measuring method under concrete frame structure seasonal temperature difference action. The method includes: pouring a concrete frame structure, and measuring the initial length L0 and initial temperature T0 of the concrete frame structure during form removing; after a preset time interval, measuring the actual temperature L and actual temperature T of the concrete frame structure; calculating the actual length variation and the actual temperature variation of the concrete frame structure according to the formulas delta L=L-L0 and delta T=T-T0; calculating the temperature deformation value delta Ltemperature of the concrete frame structure under the ideal state according to the formula delta Ltemperature=L0*delta T*alpha, wherein alpha is the thermal expansion coefficient of the concrete materials of the concrete frame structure; calculating the integral constrained deformation delta Lconstraint generated when the concrete frame structure is constrained by a lower frame structure or a base plate according to the formula delta Lconstraint=delta Ltemperature-delta L. The method is capable of effectively guiding concrete frame structure crack control.
Description
Technical field
The present invention relates to a kind of engineering construction field, relate in particular to whole restrained deformation measuring method under a kind of concrete frame structure action of the seasonal difference in temperature.
Background technology
Concrete frame build after due to action of the seasonal difference in temperature, can cause that whole expansion or the distortion of contraction occur concrete frame.And the expansion of concrete frame or contraction can be subject to the constraint of base plate or bottom framework, can not completely freely occur, and due to the concrete relexation of creeping, microfracture development function, make the size of the suffered degree of restraint of concrete frame, be difficult to calculate acquisition by theory.Further, concrete frame also may be due to action of the seasonal difference in temperature, and the integral body constraint Swelling and contraction distortion causing is also difficult to calculate acquisition by theory.
Summary of the invention
The object of the present invention is to provide whole restrained deformation measuring method under a kind of concrete frame structure action of the seasonal difference in temperature, by measuring the Seasonal Temperature Difference distortion and framework internal temperature of the actual generation of concrete frame, obtain the whole restrained deformation of concrete frame, thereby can utilize whole restrained deformation, anti-base plate or the effect of contraction power of lower floor's framework to new pouring frame released, instructs concrete frame Crack Control.
In order to address the above problem and other problem, the invention provides whole restrained deformation measuring method under a kind of concrete frame structure action of the seasonal difference in temperature, comprise the following steps:
Build a concrete frame structure, when described concrete frame structure form removal, measure its initial length L
0and initial temperature T
0;
In one-year age after concrete frame structure is built, at interval of a schedule time, measure the physical length L of described concrete frame structure
actualand actual temperature T
actual;
Calculate the physical length variation delta L that described concrete frame structure changes due to seasonal temperature
actual=L
actual-L
0and actual temperature change amount Δ T=T
actual-T
0;
Calculate described concrete frame structure because seasonal temperature changes temperature deformation value Δ L in the ideal situation
temperature=L
0* Δ T * α, the thermal expansivity of the concrete material that wherein α is described concrete frame structure;
Calculate described concrete frame structure because seasonal temperature changes and is subject to the whole restrained deformation Δ L that bottom architecture or restriction from soleplate produce
constraint=Δ L
temperature-Δ L
actual.
The present invention further improves and is, measures the initial length L of described concrete frame structure
0and physical length L
actualfurther comprise:
When described concrete frame structure form removal, at described concrete frame structure, choose two measurement points of equal height, a measurement point is set up a laser range finder and is set up a baffle plate in another measurement point therein;
When described concrete frame structure form removal, utilize described laser range finder to launch a laser, this laser is reflected back into described laser range finder through described baffle plate, thereby measures the initial length L of described concrete frame structure
0;
In view of described laser range finder and described baffle plate, the distortion with described concrete frame structure under different temperatures situation is subjected to displacement, interval is after the schedule time, utilize described laser range finder to launch a laser, this laser is reflected back into described laser range finder through described baffle plate, thereby measures the physical length L of described concrete frame structure
actual.
The present invention further improves and is, measures the initial length L of described concrete frame structure
0and physical length L
actualfurther comprise:
When described concrete frame structure form removal, at described concrete frame structure, choose two measurement points of equal height, a measurement point is set up a measuring box and is set up a baffle plate in another measurement point therein, described measuring box comprises for placing a plurality of mounting grooves of laser range finder, parallel to each other between mounting groove described in each;
When described concrete frame structure form removal, successively laser range finder is arranged in different mounting grooves and measures respectively each mounting groove to the distance L of described baffle plate
0i, wherein, the numbering that i is mounting groove, by all L
0iaverage and can try to achieve the initial length L of described concrete frame structure
0;
In view of described measuring box and described baffle plate, the distortion with described concrete frame structure under different temperatures situation is subjected to displacement, through after the schedule time, successively laser range finder is arranged in different mounting grooves and measures respectively each mounting groove to the distance L of described baffle plate
actual i, wherein, the numbering that i is mounting groove, by all L
actual iaverage and can try to achieve the physical length L of described concrete frame structure
actual.
The present invention further improves and is, measures the initial temperature T of described concrete frame structure
0and actual temperature T
actualfurther comprise:
A plurality of temperature sensors are set in the bar construction before described concrete frame structure is built;
When described concrete frame structure casting complete and form removal, utilize wireless automatic temperature measurement instrument to detect to read the measured temperature value of temperature sensor described in each, temperature sensor is recorded to the mean value of temperature value as the initial temperature T of described concrete frame structure
0; One schedule time of interval, utilize wireless automatic temperature measurement instrument again to detect to read the temperature value of temperature sensor measurement described in each, temperature sensor is recorded to the mean value of temperature value as the actual temperature T of described concrete frame structure
actual.
The present invention further improves and is, the quantity of described temperature sensor is four, and 1/2nd places, 1/4th places, 1/8th that these four described temperature sensors are embedded in respectively concrete frame structure thickness in advance sentence and concrete frame structure lower face 2 centimeters.
The present invention further improves and is, the described schedule time is two weeks, one month or two months.
The present invention has been owing to having adopted above technical scheme, makes it have following beneficial effect to be: utilize laser range finder actual measurement to go out concrete frame structure because the overall shrinkage restrained deformation Δ L that temperature variation produces is actual; Utilize temperature sensor to obtain the actual temperature change amount Δ T of concrete frame structure, the global theory change in displacement Δ L temperature producing due to temperature variation by calculating concrete frame structure, thereby instead release the effect of contraction Δ L constraint to concrete frame structure of bottom frame structure or base plate, instruct concrete frame structure Crack Control.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of a kind of embodiment of whole restrained deformation measuring method under concrete frame structure action of the seasonal difference in temperature of the present invention.
Fig. 2 is the schematic diagram of the measuring box of whole restrained deformation measuring method under concrete frame structure action of the seasonal difference in temperature of the present invention;
Fig. 3 is the scheme of installation of the temperature sensor of whole restrained deformation measuring method under concrete frame structure action of the seasonal difference in temperature of the present invention;
Fig. 4 is the contrast schematic diagram of concrete frame structure before and after the temperature change in whole restrained deformation measuring method under concrete frame structure action of the seasonal difference in temperature of the present invention.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the present invention is further detailed explanation.
Consult shown in Fig. 1 to Fig. 4, the invention discloses whole restrained deformation measuring method under a kind of concrete frame structure 10 action of the seasonal difference in temperatures, mainly utilized the wireless automatic temperature measurement instrument 14 of laser range finder 11 and baffle plate 12, temperature sensor 13 and reading temperature sensor 13 measured values and measuring box 15 measure concrete frame structures 10 be subject to fabric or base plate constraint and under the method for the restrained deformation that produces due to temperature variation, its method mainly comprises the following steps:
S1: build a concrete frame structure 10, measure its initial length L when described concrete frame structure form removal
0and initial temperature T
0;
S2: in the one-year age after concrete frame structure 10 is built, at interval of a schedule time, utilize method in S1 to measure the physical length L of described concrete frame structure
actualand actual temperature T
actual;
S3: calculate the physical length variation delta L that described concrete frame structure changes due to seasonal temperature
actual=L
actual-L
0and actual temperature change amount Δ T=T
actual-T
0;
S4: calculate described concrete frame structure because seasonal temperature changes temperature deformation value Δ L in the ideal situation
temperature=L
0* Δ T * α, the thermal expansivity of the concrete material that wherein α is described concrete frame structure;
S5: calculate described concrete frame structure because seasonal temperature changes and is subject to the whole restrained deformation Δ L that bottom architecture or restriction from soleplate produce
constraint=Δ L
temperature-Δ L
actual.
As shown in Figure 1, in the present embodiment, measure initial length L
0and L
actualwhat adopt is laser ranging mode.Particularly: chosen laser range finder 11, the range finding of laser range finder 11 is 200m, and precision is 0.01mm, laser range finder 11 is by powered battery, and described battery can be dry cell or accumulator.When utilizing laser range finder 11 to measure, by laser range finder 11, to baffle plate 12, penetrate beam of laser, this laser is reflected back into laser range finder 11 by baffle plate 12, and laser range finder 11 calculates laser range finder 11 to the distance of baffle plate 12 by measuring laser from ejaculation laser range finder 11 to the time that is reflected back into laser range finder 11.
As depicted in figs. 1 and 2, in order to improve measuring accuracy, in the present embodiment, laser range finder 11 is set up in measuring box 15, measuring box 15 is used steel plates processing in order to place laser range finder 11, the long 20cm of measuring box 15, wide 16cm, high 6cm, the steel plate suitable with five block sizes is processed into base plate, three blocks of side plates and end plate, then be welded, measuring box 15 is divided into two mounting grooves, each mounting groove can be placed laser range finder 11, during each measurement, laser range finder 11 being sequentially positioned over to (or two laser range finders 11 being positioned over respectively in two mounting grooves of measuring box 15) in a mounting groove of measuring box 15 measures, data measured is averaged, distance using mean value between from measuring box to baffle plate, measuring box is shown in Fig. 2.
As shown in Figure 1, after measuring box 15 completes, in concrete frame structure 10, select spacing at 100m with two interior posts, as the measurement point of measuring concrete frame structure 10 distortion, in two post sides higher than back 1m high position, a pre-buried block plate welds respectively measuring box 15 and baffle plate 12(galvanized steel plain sheet immediately on two pre-embedded steel slabs after concrete frame structure 10 form removals respectively); During welding, laser range finder 11 is put into measuring box 15 and opened laser range finder 11, when laser energy is irradiated on the baffle plate 12 on opposite, measuring box 15 and pre-embedded steel slab are welded.
As shown in Figure 1, after concrete frame structure 10 form removals, immediately laser range finder 11 is put into two different mounting grooves of measuring box 15, and use laser range finder 11 to measure different mounting grooves to the distance of baffle plate 12, then by the L of data measured in different mounting grooves
01, L
02average as measuring the distance of measuring box 15 to 12, baffle plate, and the initial length L using this distance as concrete frame structure 10
0.
As shown in figures 1 and 3, in the present embodiment, measure initial temperature T
0and T
actualwhat adopt is wireless temperature measurement mode, comprising: chosen wireless automatic temperature measurement instrument 14, wireless automatic temperature measurement instrument 14 can read the measurement result of the temperature sensor 13 being embedded in concrete frame structure 10 the interval schedule time automatically.As from the foregoing, temperature sensor 13 is embedded in concrete frame structure 10, particularly: before concrete frame is built, at depth of beam middle part, along cantilever thickness, bury 4 temperature sensors 13 underground, one at the thick middle part of beam, and one in 1/4 thick position of beam, and one in 1/8 thick position of beam, a 2cm below template 16, the medial temperature that 4 temperature sensors 13 of usining record is as the temperature of concrete frame structure 10.This way that a plurality of temperature sensors 13 are embedded in to concrete frame structure 10 inner different depths can avoid sun exposure, the impact that the factors such as temperature sudden change are brought measured temperature.
When concrete frame structure 10 form removal, concrete frame structure 10 is as shown in Fig. 4 dotted portion, and now concrete frame structure 10 does not also deform.When season is during temperature variation, the length variation with temperature of concrete frame structure 10 changes, in this, with the distortion of concrete frame structure 10, be subjected to displacement the position of measuring box 15 and baffle plate 12, the concrete frame structure 10 after distortion is as shown in solid line part in Fig. 4 simultaneously.Now measuring box 15 changes to the distance of baffle plate 12.
As shown in Figure 1 and Figure 4, after concrete frame structure 10 form removals, every the schedule time, measure one-shot measurement box 15 to the distance of 12, baffle plate, as the length L of corresponding moment concrete frame structure 10
actual, wherein the schedule time is chosen as two weeks, one month or two months.L
actualmeasuring method and L
0measuring method identical, while measuring, first laser range finder 11 is put into two different mounting grooves of measuring box 15 at every turn, and is used laser range finder 11 to measure different mounting grooves to the distance of baffle plate 12, then by the L of data measured in different mounting grooves
actual 1, L
actual 2average as measuring the distance of measuring box 15 to 12, baffle plate, and the physical length L using this distance as concrete frame structure 10
actual.
As shown in figures 1 and 3, in the time of each measurement concrete frame structure 10 length variations, use wireless automatic temperature measurement instrument 14 to measure the measured value of the temperature sensor 13 that is embedded in advance concrete frame structure 10 inside, the temperature using the mean value of the measured value of these four temperature sensors 13 as concrete frame structure 10.
As shown in Figure 4, at each physical length L that measures concrete frame structure 10
actualand actual temperature T
actualafterwards related data is processed: calculate each concrete frame structure 10 temperature T
actualwith respect to the temperature T of measuring first concrete frame structure 10
0changing value Δ T=T
actual-T
0; Calculate concrete frame structure 10 because seasonal temperature changes, under ideal state, while not being subject to base plate or bottom frame constraint, time the concrete frame structure 10 that should produce due to temperature length variations value Δ L
temperature=L
0* Δ T * α, wherein α is concrete thermal expansivity; Calculate the physical length variation delta L that concrete frame structure 10 occurs due to Seasonal Temperature Difference
actual=L
actual-L
0; Finally calculate concrete frame structure 10 because Seasonal Temperature Difference produces distortion, and be subject to base plate or lower floor's frame constraint and the longitudinal whole restrained deformation that produces is: Δ L
constraint=Δ L
temperature-Δ L
actual.
The present invention has been owing to having adopted above technical scheme, makes it have following beneficial effect to be: utilize laser range finder actual measurement to go out the overall shrinkage restrained deformation Δ L that concrete frame structure produces due to temperature variation
actual; Utilize temperature sensor to obtain the actual temperature change amount Δ T of concrete frame structure, the global theory change in displacement Δ L producing due to temperature variation by calculating concrete frame structure
temperaturethereby, anti-bottom frame structure or the effect of contraction Δ L of base plate to concrete frame structure of releasing
constraint, instruct concrete frame structure Crack Control.
Below embodiment has been described in detail the present invention by reference to the accompanying drawings, and those skilled in the art can make many variations example to the present invention according to the above description.Thereby some details in embodiment should not form limitation of the invention, the present invention will be usingd scope that appended claims defines as protection scope of the present invention.
Claims (6)
1. a whole restrained deformation measuring method under concrete frame structure action of the seasonal difference in temperature, is characterized in that, said method comprising the steps of:
Build a concrete frame structure, when described concrete frame structure form removal, measure its initial length L
0and initial temperature T
0;
In one-year age after concrete frame structure is built, at interval of a schedule time, measure the physical length L of described concrete frame structure
actualand actual temperature T
actual;
Calculate the physical length variation delta L that described concrete frame structure changes due to seasonal temperature
actual=L
actual-L
0and actual temperature change amount Δ T=T
actual-T
0;
Calculate described concrete frame structure because seasonal temperature changes temperature deformation value Δ L in the ideal situation
temperature=L
0* Δ T * α, the thermal expansivity of the concrete material that wherein α is described concrete frame structure;
Calculate described concrete frame structure because seasonal temperature changes and is subject to the whole restrained deformation Δ L that bottom architecture or restriction from soleplate produce
constraint=Δ L
temperature-Δ L
actual.
2. whole restrained deformation measuring method under concrete frame structure action of the seasonal difference in temperature as claimed in claim 1, is characterized in that, measures the initial length L of described concrete frame structure
0and physical length L
actualfurther comprise:
When described concrete frame structure form removal, at described concrete frame structure, choose two measurement points of equal height, a measurement point is set up a laser range finder and is set up a baffle plate in another measurement point therein;
When described concrete frame structure form removal, utilize described laser range finder to launch a laser, this laser is reflected back into described laser range finder through described baffle plate, thereby measures the initial length L of described concrete frame structure
0;
In view of described laser range finder and described baffle plate, the distortion with described concrete frame structure under different temperatures situation is subjected to displacement, interval is after the schedule time, utilize described laser range finder to launch a laser, this laser is reflected back into described laser range finder through described baffle plate, thereby measures the physical length L of described concrete frame structure
actual.
3. whole restrained deformation measuring method under concrete frame structure action of the seasonal difference in temperature as claimed in claim 1, is characterized in that, measures the initial length L of described concrete frame structure
0and physical length L
actualfurther comprise:
When described concrete frame structure form removal, at described concrete frame structure, choose two measurement points of equal height, a measurement point is set up a measuring box and is set up a baffle plate in another measurement point therein, described measuring box comprises for placing a plurality of mounting grooves of laser range finder, parallel to each other between mounting groove described in each;
When described concrete frame structure form removal, successively laser range finder is arranged in different mounting grooves and measures respectively each mounting groove to the distance L of described baffle plate
0i, wherein, the numbering that i is mounting groove, by all L
0iaverage and can try to achieve the initial length L of described concrete frame structure
0;
In view of described measuring box and described baffle plate, the distortion with described concrete frame structure under different temperatures situation is subjected to displacement, through after the schedule time, successively laser range finder is arranged in different mounting grooves and measures respectively each mounting groove to the distance L of described baffle plate
actual i, wherein, the numbering that i is mounting groove, by all L
actual iaverage and can try to achieve the physical length L of described concrete frame structure
actual.
4. whole restrained deformation measuring method under the concrete frame structure action of the seasonal difference in temperature as described in claim 1,2 or 3, is characterized in that, measures the initial temperature T of described concrete frame structure
0and actual temperature T
actualfurther comprise:
A plurality of temperature sensors are set in the bar construction before described concrete frame structure is built;
When described concrete frame structure casting complete and form removal, utilize wireless automatic temperature measurement instrument to detect to read the measured temperature value of temperature sensor described in each, temperature sensor is recorded to the mean value of temperature value as the initial temperature T of described concrete frame structure
0; One schedule time of interval, utilize wireless automatic temperature measurement instrument again to detect to read the temperature value of temperature sensor measurement described in each, temperature sensor is recorded to the mean value of temperature value as the actual temperature T of described concrete frame structure
actual.
5. whole restrained deformation measuring method under concrete frame structure action of the seasonal difference in temperature as claimed in claim 4, it is characterized in that, the quantity of described temperature sensor is four, and 1/2nd places, 1/4th places, 1/8th that these four described temperature sensors are embedded in respectively concrete frame structure thickness in advance sentence and concrete frame structure lower face 2 centimeters.
6. whole restrained deformation measuring method under the concrete frame structure action of the seasonal difference in temperature as described in claim 1,2 or 3, is characterized in that, the described schedule time is two weeks, one month or two months.
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