CN108303327A - Device and method for evaluating the concrete steam-cured critical intensity of prefabricated shield duct piece - Google Patents
Device and method for evaluating the concrete steam-cured critical intensity of prefabricated shield duct piece Download PDFInfo
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- CN108303327A CN108303327A CN201810138390.7A CN201810138390A CN108303327A CN 108303327 A CN108303327 A CN 108303327A CN 201810138390 A CN201810138390 A CN 201810138390A CN 108303327 A CN108303327 A CN 108303327A
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- 238000002347 injection Methods 0.000 claims abstract description 23
- 239000007924 injection Substances 0.000 claims abstract description 23
- 230000001360 synchronised effect Effects 0.000 claims abstract description 23
- 239000000203 mixture Substances 0.000 claims abstract description 22
- 238000002360 preparation method Methods 0.000 claims abstract description 13
- 238000012423 maintenance Methods 0.000 claims abstract description 9
- 238000010923 batch production Methods 0.000 claims abstract description 8
- 239000000523 sample Substances 0.000 claims description 63
- 238000012360 testing method Methods 0.000 claims description 17
- 230000006835 compression Effects 0.000 claims description 11
- 238000007906 compression Methods 0.000 claims description 11
- 238000004088 simulation Methods 0.000 claims description 8
- 230000008878 coupling Effects 0.000 claims description 7
- 238000010168 coupling process Methods 0.000 claims description 7
- 238000005859 coupling reaction Methods 0.000 claims description 7
- 230000035515 penetration Effects 0.000 claims description 6
- 230000006378 damage Effects 0.000 claims description 5
- 230000008569 process Effects 0.000 claims description 5
- 239000002689 soil Substances 0.000 claims description 5
- 238000007689 inspection Methods 0.000 claims description 4
- 238000004458 analytical method Methods 0.000 claims description 3
- 230000000740 bleeding effect Effects 0.000 claims description 3
- 230000015271 coagulation Effects 0.000 claims description 2
- 238000005345 coagulation Methods 0.000 claims description 2
- 238000013461 design Methods 0.000 description 10
- 208000037656 Respiratory Sounds Diseases 0.000 description 2
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- 239000010959 steel Substances 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 238000009435 building construction Methods 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000000887 hydrating effect Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000009533 lab test Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000011505 plaster Substances 0.000 description 1
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- 239000004575 stone Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
- G01N3/12—Pressure testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0048—Hydraulic means
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Abstract
The invention discloses a kind of devices of evaluation prefabricated shield duct piece type concrete steam maintenance critical intensity, its main feature is that：The detection bucket for being packed into concrete mix including detection support, above detection support for applying stressed hydraulic jack, being placed on hydraulic jack lower section and detection support plate upper surface, is used to detect the detection device of concrete injection intensity mounted on hydraulic jack lower end；A kind of detection method of the prefabricated shield duct piece type concrete steam maintenance critical intensity of evaluation is also disclosed, including：Be arranged it is quiet stop the preparation stage before parameter, setting synchronous point, setting with batch production, laboratory synchronous production in-site modeling enter that concrete pipe sheet is quiet and stop, laboratory synchronous production in-site modeling enters before each steam curing it is quiet stop stage, evaluation, obtain concrete steam-cured critical intensity.The present invention has filled up domestic blank in concrete steam-cured critical intensity technical field, it is proposed that a kind of theory of new concrete strength.
Description
Technical field
The invention belongs to prefabricated shield duct piece technical field of building construction more particularly to a kind of prefabricated shield duct piece of evaluation to use
The device and method of concrete steam-cured critical intensity.
Background technology
Prefabricated shield duct piece is generally used for making concrete metro tunnel, and each section in concrete metro tunnel is by 6 arcs
The prefabricated shield segment assembling of shape forms, as shown in Figure 1 and Figure 2.
In shield duct piece production process, to shorten the period, accelerate mold turnover, the steam-cured method of generally use.
The steam protecting method is divided into two stages, and the first stage is that quiet before entering steam curing room stops the phase (precuring phase), the
Two-stage is the temperature adjustment curing period entered after steam curing room；The quiet construction content for stopping the phase (precuring phase) is both concrete
Entering the pervious preparation in steam curing room, preparation includes in concrete casting to model and vibrate close
It is real, further include carrying out repeatedly plastering so that its surface smooth and beautiful appearance to being cast to the concrete of mold as shown in Figure 4, Figure 5,
Then it stays for some time again, then this period stopped is referred to as " quiet to stop the phase "." quiet to stop the phase " concrete residence time length
Often decide that concrete resists the ability that steam curing destroys；The temperature adjustment curing period is both that section of jurisdiction enters steam curing room,
Steam-cured roof portion has pipeline to lead to steam, adjusts temperature by changing steam delivery volume, steam-cured room is divided into heating room area, constant-temperature house
These three room areas are passed through in area, three areas Ge Fang of temperature-lowering room area, section of jurisdiction successively, and heating room area is gradually increased to 55 degree from room temperature, lasts 1
Hour, constant-temperature house area keep 55 degree it is constant, last 2 hours, room temperature is down in cooling area by 55 degree again, last 1 hour it is (different
Unit thermostat temperature and time may be different).When concrete, which enters three above room area, carries out steam curing, high temperature meeting
Concrete is caused to damage, cause it is steam-cured after section of jurisdiction the mass defects such as crack.
Cause it is above it is steam-cured after the section of jurisdiction the reason of mass defects such as cracking, be that concrete is entering steam curing room
Before, that is, it is quiet stop the phase after initial structural strength is not big enough, compactness is not big enough, therefore find out concrete
Steam-cured critical intensity (i.e. it is quiet stop how long after intensity can just resist steam-cured destruction) be particularly important.
The prior art measures the compression strength that concrete strength generally refers both to measure concrete, and the method used is to pass through
Forcing press crushes concrete test block, and the present invention concrete strength refer to type concrete steam maintenance after do not crack
Intensity, domestic at present is also a blank for measuring type concrete steam curing strength.
Invention content
The present invention proposes a kind of device and method of the prefabricated concrete steam-cured critical intensity of shield duct piece of evaluation, to
Solve the problems, such as that initial structural strength of the concrete before entering steam curing room is not big enough, compactness is not big enough.
A kind of prefabricated shield duct piece of evaluation conserves the device of critical intensity with type concrete steam, it is characterised in that：Including inspection
Holder is surveyed, is used to apply stressed hydraulic jack above detection support, is placed on hydraulic jack lower section and detection
The detection bucket of the loading concrete mix of holder plate upper surface, mounted on hydraulic jack lower end for detecting concrete
The detection device of injection intensity.
The detection support includes that bottom plate, the column around bottom plate, column top are located at the same horizontal plane and staggeredly branch
The annular swivel nut for setting up hydraulic jack is equipped among several cross bars of support, several cross bars.
The detection support bottom plate is square plate, and the column around the bottom plate is to divide on one group of opposite side of square plate
Several the highly identical and spaced apart columns not being arranged；Several cross bars are along cradle top by outer
Inwardly be divided into one group of cross bar, two groups of cross bar, three groups of cross bar, be arranged in a mutually vertical manner between every two groups of three groups of cross bars, every group of cross bar by
It two equal lengths and is mutually parallel and cross bar spaced apart composition；Two cross bars of one group of cross bar respectively with square bar
Column on the one group of opposite side and opposite side of plate constitutes perpendicular；The annular spiral shell is set on innermost layer and middle layer two
Among the box of group cross bar composition, and it is affixed with the frame around box.
The hydraulic jack is national standard JC473-92《Concrete pressure bleeding instrument》In hydraulic jack used, should
Hydraulic jack includes 1 jack of one end and 1 oil pump of the other end, is oil pipe, mistake between jack and oil pump
One end of oil pipe is connected by quick coupling with hydraulic pressure threeway, hydraulic pressure threeway is connect with jack and pressure gauge respectively, excessively oily
The other end of pipe is connected by quick coupling with oil pump；The oil pump includes the oily cylinder of tubulose and the compression bar of tubulose；The spy
It includes carrying the probe swivel nut of external screw thread and internal thread and carrying externally threaded probe to survey device, and probe swivel nut passes through external screw thread
It is attached to the jack at end, is connected to the probe of its lower end by internal thread；The probe total height 80MM, including it is upper
Lower two parts, probe top are matched with external screw thread and diameter and height with probe swivel nut, and probe upper height is 10MM,
A diameter of 13.5MM；Probe lower height is 70MM, a diameter of 40MM, and probe lower part is divided into have scale area and without scale area,
It is the probe area from the upward 50MM of probe base to have scale area, is a scale area per 5MM.
A kind of detection method of the evaluation prefabricated shield duct piece device of type concrete steam maintenance critical intensity, feature exist
In：Include the following steps：
Step 1: setting is quiet to stop parameter：The type concrete steam maintenance quiet stopping time for presetting several separated in time is long, to divide
Analyse it is quiet stop how long after concrete strength can just resist steam-cured destruction；
Step 2:Synchronous point is set：The synchronous point is each quiet stopping time length and the production scene of test in laboratory critical intensity Each quiet stopping time length of the corresponding concrete pipe sheet of production is corresponding or equal；The synchronous point further includes laboratory and production scene Using the concrete and concrete mix of the same lot number；
Step 3: setting is the same as batch production：Multiple concrete pipe sheets that production scene is grown with the batch production corresponding different quiet stopping times,
Production process includes preparation stage before quiet stop, quiet stops stage, steam curing stage；
Step 4: laboratory synchronous production is live, simulation enter that concrete pipe sheet is quiet and stop before preparation stage；
Step 5: laboratory synchronous production is live, simulation enter before each steam curing it is quiet stop the stage, be respectively adopted it is corresponding not
With the detection cylinder of length of quiet stopping time, its injection intensity is detected with same method；
Step 6: evaluation, obtains concrete steam-cured critical intensity；
The quiet stopping time for presetting several separated in time of the step 1 is long, generally using 20 minutes or 30 minutes as different
The time interval of quiet stopping time length；
The laboratory synchronous production scene of the step 4, simulation enter that concrete pipe sheet is quiet and stop before preparation stage, specific mistake
Cheng Wei：
(1) quantity of the detection cylinder of the corresponding concrete pipe sheet per a kind of quiet stopping time length of setting is 3；
(2) concrete mix of the corresponding concrete pipe sheet per a kind of quiet stopping time length is separately filled with respective 3 detection buckets,
And simultaneously by the concrete mix vibration compacting in respective 3 detection buckets；
(3) it enables the concrete mix after vibration compacting enter and respective quiet stops the stage.
The step 5 detects its injection intensity with same method, and detailed process is：
(1) the quiet of laboratory synchronous production scene stops the period, will be mixed after corresponding different quiet stopping times length and completion vibration compacting
Solidifying soil, which enters, respective quiet stops the period；
(2) 3 concrete NDT cylinders for completing current quiet stopping time length are put into successively on detection support bottom plate；
(3) check valves of hydraulic jack are tightened before jack probe penetration concrete；
(4) press repeatedly hydraulic jack compression bar the probe of jack is extended downwardly, with holder bottom plate on detection bucket in
Concrete surface flush；
(5) very heavy compression bar is pressed repeatedly again, until 20mm inside its probe penetration concrete；
(6) this pressure gauge reading is recorded, 0.5MPa is accurate to, being denoted as the quiet stopping time grows the concrete of the corresponding detection bucket and pass through
Enter intensity.
(7) (2) to (6) step is repeated, until the concrete strength of 3 concrete NDT buckets of current quiet stopping time length will be completed
Detection finishes；
(8) sequential selection completes 3 concrete NDT cylinders of next quiet stopping time length, and repeats to (7) step.
The evaluation of the step 6 obtains concrete steam-cured critical intensity, specific as follows：
(1) average value of the injection intensity detected using 3 detection buckets of corresponding each quiet stopping time length as testing every time
Injection intensity；
There are one in the maximum value or minimum value of (2) 3 detection bucket injection intensity and the difference of median is more than the 10% of median
When, it should be using median as the injection intensity tested every time；
(3) it when maxima and minima is more than the 10% of median, should test again；
(4) after the different quiet corresponding injection intensity of stopping time length of comparison and corresponding different quiet stopping time long production scenes are steam-cured outside section of jurisdiction
The not cracked critical point of cambered surface, obtains steam-cured critical intensity；The not cracked critical point is outside steam-cured rear section of jurisdiction
Pressure gauge intensity value when the corresponding quiet stopping time is long when cambered surface is not cracked, the pressure gauge volume unit are megapascal.
Advantages of the present invention effect
1, the present invention has filled up domestic blank in concrete steam-cured critical intensity technical field, it is proposed that a kind of new strong concrete
The theory of degree is directed to the theory for the concrete steam-cured critical intensity that crackle is easy tod produce after type concrete steam conserves.It solves
Concrete pipe sheet initial structural strength is not big enough for a long time, compactness is not big enough, generates and splits after causing concrete pipe sheet steam-cured
The technical barrier of line, by using the test device and method of prefabricated shield duct piece steam curing critical intensity, to pipe of concrete
The steam-cured critical intensity of piece makes accurate evaluation.
2, the present invention tests the method being combined using laboratory test and production scene：It is responsible for measuring concrete in laboratory
Each quiet intensity for stopping the stage, production scene are responsible for providing the judging basis of concrete steam-cured rear critical intensity, by dexterously
Borrow production process so that production process is production service, is also testing service, reaches the purpose killed two birds with one stone, together
When decrease the experimental procedure tested in laboratory, shorten the detection cycle in laboratory.
3, the present invention proposes a kind of device for testing concrete steam-cured critical intensity, passes through the device detection support
Special designing in structure so that detection support when by the pressure of some strength, will not because of pressure generate upwards or to
Under deformation and influence detection result；Pass through the special designing in detection probe structure so that pressure gauge is read convenient for reading pressure
Number.
Description of the drawings
Fig. 1 is prefabricated shield duct piece application effect figure；
Fig. 2 is prefabricated shield duct piece shape design sketch；
Fig. 3 is that prefabricated shield duct piece makes mold schematic diagram；
Fig. 4 is detection device stereogram of the present invention；
Fig. 5 is detection support stereogram of the present invention；
Fig. 6 is hydraulic jack stereogram；
Fig. 7 is that detection support of the present invention overlooks dimensional drawing；
Fig. 8 is detection support front view of the present invention；
Fig. 9 is detection support left view of the present invention；
Figure 10 is detection support annular swivel nut main view dimensional drawing, overlooks dimensional drawing；
Figure 11 is probe stereogram of the present invention, forward sight dimensional drawing；
Figure 12 is probe swivel nut stereogram of the present invention；
Figure 13 is probe swivel nut forward sight dimensional drawing of the present invention；
In figure, 1：Detection support；1-1：Detection support bottom plate；1-2：Detection support column；1-3-1：One group of cross bar；1-3-2：
Two groups of cross bar；1-3-3：Three groups of cross bar；1-4：Annular swivel nut；2：Hydraulic jack；2-1：Jack；2-2：Threeway； 2-3：Soon
Quick coupling；2-4：Cross oil pipe；2-5-1：Oil pump compression bar；2-5-2：Oily cylinder；3：Detect cylinder；4, detection device.
Specific implementation mode
Further invention content is explained below in conjunction with the accompanying drawings：
Design principle of the present invention：
1, the design principle of detection device：This detection device have in design 2 points it is very crucial, first will ensure in jack
Act on concrete generate sufficient intensity in the case of, detection support will not deform, it is described it is indeformable refer to its top and bottom
It does not arch upward upwards due to by powerful pressure or to lower recess；Second to ensure concrete probe be inserted into concrete when, pressure
Required reading can be generated on table.For first design key point, the present invention use detection support back-plane design for
The steel plate of 12MM thickness, and detection support is all using steel.Cradle top arches upward in order to prevent, and holder both sides increase separately
One root post is improved to six roots of sensation column by traditional volume four columns.For second design key point, the present invention is by probe
Diameter design is 40MM, this is by testing the data obtained repeatedly, and probe is meticulous, and it is mixed to rant out such as sewing-needle insertion
Solidifying soil can not make the reading of pressure gauge generate variation since pressure gauge is too small by being inserted into the resistance that concrete is subject to；Instead
It, probe is excessively thick, for example, if the probe of the thick diameter of washbowl is put into concrete, it, can not because resistance is too big
It is inserted into concrete, at this point, pressure gauge is equally not easy to generate pressure reading, so, the fineness degree of probe presses test
Power is very crucial.
2, the design principle of detection method：
A, it is to need certain external condition to generate concrete critical intensity.The external condition is by inserting a probe into coagulation
Soil so that probe is by resistance so that the pressure gauge of linking probe generates reading for the intensity of pressure.
B, laboratory of the present invention synchronize refers to using a collection of concrete mix and using same with production scene
The quiet stopping time is long.
C, concrete structure is destroyed since probe is inserted into after concrete, concrete being destroyed itself has occurred that
Slight crack, so cannot be then sent through steam curing room carries out whether maintenance rear surface has the test of crackle.
Based on the above design principle, it is critical strong that the present invention proposes that a kind of evaluation prefabricated shield duct piece type concrete steam conserves
The device of degree.
As shown in figure 4, a kind of prefabricated shield duct piece of evaluation conserves the device of critical intensity, feature with type concrete steam
It is：It is used to apply stressed hydraulic jack 2, be placed on hydraulic jack including detection support 1, above detection support
The detection bucket 3 of the loading concrete mix of top lower section and detection support plate upper surface, is mounted on hydraulic jack lower end and uses
In the detection device 4 of detection concrete injection intensity.
As shown in figure 5, the detection support includes bottom plate 1-1, the column 1-2 around bottom plate, column top be located at it is same
A horizontal plane and staggeredly several cross bars (1-3-1,1-3-2,1-3-3) of support, several cross bars (1-3-1,1-3-2,1-
3-3) the intermediate annular swivel nut 1-4 being equipped with for setting up hydraulic jack.
As shown in figure 5, the detection support bottom plate is square plate, the column around the bottom plate is square plate one
Several the highly identical and spaced apart column 1-2 being respectively set on group opposite side；Several cross bars along
Cradle top ecto-entad is divided into three groups of one group of 1-3-1 of cross bar, two groups of 1-3-2 of cross bar, cross bar 1-3-3, every two groups of three groups of cross bars
Between be arranged in a mutually vertical manner, every group of cross bar is by two equal lengths and is mutually parallel and cross bar spaced apart forms；Cross bar
One group of two cross bars constitute perpendicular with the column on the one group of opposite side and opposite side of square plate respectively；The annular
Swivel nut 1-4 is arranged among the box that two groups of cross bars of innermost layer and middle layer form, and affixed with the frame around box.
As shown in fig. 6, the hydraulic jack is national standard JC473-92《Concrete pressure bleeding instrument》In liquid used
It includes 1 jack 2-1 of one end and 1 oil pump (2-5-1,2-5-2) of the other end to press jack, the hydraulic jack,
Be oil pipe 2-4 between jack 2-1 and oil pump (2-5-1,2-5-2), cross one end of oil pipe 2-4 by quick coupling 2-3 with
Hydraulic pressure threeway is connected, hydraulic pressure threeway is connect with jack 2-1 and pressure gauge 2-6 respectively, and the other end for crossing oil pipe 2-4 passes through
Quick coupling 2-3 is connected with oil pump；The oil pump includes the oily cylinder 2-5-2 of the tubulose and compression bar 2-5-1 of tubulose；As Figure 12,
Shown in Figure 13, the detection device 4 includes carrying the probe swivel nut 4-1 of external screw thread and internal thread and with externally threaded probe
4-2, probe swivel nut 4-1 are attached to the jack 2-1 at end by external screw thread, are connected to the spy of its lower end by internal thread
Needle 4-2；The probe 4-2 total height 80MM, including upper and lower two parts, probe top with external screw thread and diameter and highly with
Probe swivel nut matches, and probe upper height is 10MM, a diameter of 13.5MM；Probe lower height is 70MM, a diameter of
40MM, probe lower part are divided into have scale area and without scale area, it is from the probe region of the upward 50MM of probe base to have scale area
Domain is a scale area per 5MM.
A kind of detection method of the evaluation prefabricated shield duct piece device of type concrete steam maintenance critical intensity, feature exist
In：Include the following steps：
Step 1: setting is quiet to stop parameter：The type concrete steam maintenance quiet stopping time for presetting several separated in time is long, to divide
Analyse it is quiet stop how long after concrete strength can just resist steam-cured destruction；
The quiet stopping time for presetting several separated in time of the step 1 is long, generally using 20 minutes or 30 minutes as different
The time interval of quiet stopping time length；
Supplementary explanation：The concrete in static stopping time, length was set as 2.5 hours in general production, general 20 points of the interval of length of different quiet stopping times
For clock to half an hour, this is determined according to the speed that concrete hydrating reacts, and the present embodiment assume that 3 quiet stopping times of setting
Often, respectively 2.5 hours, 3 hours, 3.5 hours；
Step 2:Synchronous point is set：The synchronous point is each quiet stopping time length and the production scene of test in laboratory critical intensity Each quiet stopping time length of the corresponding concrete pipe sheet of production is corresponding or equal；The synchronous point further includes laboratory and production scene Using the concrete and concrete mix of the same lot number；
Step 3: setting is the same as batch production：Multiple concrete pipe sheets that production scene is grown with the batch production corresponding different quiet stopping times,
Production process includes preparation stage before quiet stop, quiet stops stage, steam curing stage；
Supplementary explanation：Present invention setting with batch production, be in order to macroscopically, by the detection of different quiet stopping times length concurrently into
Row, the detection cycle of two neighboring duration only differs half an hour during the first, second, third quiet stopping time was grown, and compares adopt on the whole
Detection cycle is substantially reduced with the length of quiet stopping time of serial operation.
Step 4: laboratory synchronous production is live, simulation enter that concrete pipe sheet is quiet and stop before preparation stage；
Detailed process is：
(1) quantity of the detection cylinder of the corresponding concrete pipe sheet per a kind of quiet stopping time length of setting is 3；
Supplementary explanation：Here it is to reduce error to acquire average value that 3 detection cylinders, which are arranged,.
(2) concrete mix of the corresponding concrete pipe sheet per a kind of quiet stopping time length is separately filled with respective 3 inspections
Bucket is surveyed, and simultaneously by the concrete mix vibration compacting in respective 3 detection buckets；
Supplementary explanation：In the production of practical concrete pipe sheet it is quiet stop before preparation stage include fresh concrete, by concrete mixing
Object is put into mold and (is illustrated in figure 3 mold), closely knit and plaster repeatedly so that surface to entering the concrete vibrating after mould again
Smooth and beautiful appearance；The present invention experiment in it is quiet stop before preparation stage include：First, by the concrete mixing used in production
Object is put into corresponding detection cylinder, and second, vibration compacting is carried out to the concrete of each detection bucket, first two steps are all existing with production
Field is identical, and does not then need this link in laboratory for the multiple plastering of production scene, because the concrete of test barrel is
For being inserted into probe, not beautiful demand.
(3) it enables the concrete mix after vibration compacting enter and respective quiet stops the stage.
Supplementary explanation：Assuming that long provided with three quiet stopping times, each duration needs 3 detection buckets, then vibration compacting at this time
Detection bucket afterwards has 9, and the concrete in this 9 buckets is while vibration compacting, then according to 2.5 hours, 3 hours, 3.5
Hour, which respectively enters, quiet stops the stage.
Step 5: laboratory synchronous production is live, simulation enter before each steam curing it is quiet stop the stage, be respectively adopted pair
The detection cylinder for answering different quiet stopping time length, its injection intensity is detected with same method；
The detailed process of step 5 is：
(1) the quiet of laboratory synchronous production scene stops the period, will be mixed after corresponding different quiet stopping times length and completion vibration compacting
Solidifying soil, which enters, respective quiet stops the period；
(2) 3 concrete NDT cylinders for completing current quiet stopping time length are put into successively on detection support bottom plate；
(3) check valves of hydraulic jack are tightened before jack probe penetration concrete；
(4) press repeatedly hydraulic jack compression bar the probe of jack is extended downwardly, with holder bottom plate on detection bucket in
Concrete surface flush；
Supplementary explanation：As shown in figure 4, under static conditions, the distance of hydraulic jack probe distance detection bucket is a 3-4 centimetres of left side
The right side, flexible limit is more than 10 centimetres to jack up and down, if detection bucket it is suitable for reading apart from jack probe base it is too far if cannot
Probe is goed deep into 20MM in bucket, therefore, jack probe lower end should be at 3-4 centimetres to detection cylinder initial distance suitable for reading
Between；
(5) very heavy compression bar is pressed repeatedly again, until 20mm inside its probe penetration concrete；
(6) this pressure gauge reading is recorded, 0.5MPa is accurate to, being denoted as the quiet stopping time grows the concrete of the corresponding detection bucket and pass through
Enter intensity；
(7) (2) to (6) step is repeated, until the concrete strength inspection of 3 concrete NDT buckets of current quiet stopping time length will be completed
It finishes；
(8) sequential selection completes 3 concrete NDT cylinders of next quiet stopping time length, and repeats (2) to (7) step.
Step 6: evaluation, obtains concrete steam-cured critical intensity；
Step 6 it is specific as follows：
(1) average value of the injection intensity detected using 3 detection buckets of corresponding each quiet stopping time length as testing every time
Injection intensity；
There are one in the maximum value or minimum value of (2) 3 detection bucket injection intensity and the difference of median is more than the 10% of median
When, it should be using median as the injection intensity tested every time；
(3) it when maxima and minima is more than the 10% of median, should test again；
(4) after the different quiet corresponding injection intensity of stopping time length of comparison and corresponding different quiet stopping time long production scenes are steam-cured outside section of jurisdiction
The not cracked critical point of cambered surface, obtains steam-cured critical intensity；The not cracked critical point is outside steam-cured rear section of jurisdiction
The pressure gauge intensity value of length of corresponding quiet stopping time when cambered surface is not cracked, the pressure gauge volume unit are megapascal.
Supplementary explanation：Length of quiet stopping time corresponding to a same intensity value may be because the concrete mix slump not
With and it is different, it is thus impossible to the foundation using length of quiet stopping time as measurement critical intensity, such as when 2.5 hours quiet stopping times are long it is right
The section of jurisdiction appearance answered does not have slight crack, and the intensity value for measuring pressure gauge at this time is 10 megapascal, but is produced next time due to concrete
The slump of mixture is different from the last time, even if having spent 2.5 hours, value of concrete strength still reaches to, less than 10 megapascal, need
10 megapascal of pressure gauge intensity value is can be only achieved after half an hour, so, the foundation for measuring critical intensity value for second is 10
Megapascal, rather than 2.5 hours.
It is emphasized that embodiment of the present invention is illustrative, without being restrictive, therefore packet of the present invention
Include the embodiment being not limited to described in specific implementation mode.
Claims (9)
1. a kind of prefabricated shield duct piece of evaluation conserves the device of critical intensity with type concrete steam, it is characterised in that：Including detection
Holder is used to apply stressed hydraulic jack above detection support, is placed on hydraulic jack lower section and detection branch
The detection bucket of the loading concrete mix of frame plate upper surface, mounted on hydraulic jack lower end for detecting concrete injection
The detection device of intensity.
2. a kind of prefabricated shield duct piece of evaluation according to claim 1 conserves the device of critical intensity with type concrete steam,
It is characterized in that：The detection support includes that bottom plate, the column around bottom plate, column top are located at the same horizontal plane and staggeredly
The annular swivel nut for setting up hydraulic jack is equipped among several cross bars of support, several cross bars.
3. a kind of prefabricated shield duct piece of evaluation according to claim 2 conserves the device of critical intensity with type concrete steam,
It is characterized in that：The detection support bottom plate is square plate, and the column around the bottom plate is one group of opposite side of square plate
On several identical and spaced apart columns of height for being respectively set；Several cross bars along cradle top by
It is divided into one group of cross bar, two groups of cross bar, three groups of cross bar outside to inside, is arranged in a mutually vertical manner between every two groups of three groups of cross bars, every group of cross bar
By two equal lengths and it is mutually parallel and cross bar spaced apart forms；Two cross bars of one group of cross bar respectively with square bar
Column on the one group of opposite side and opposite side of plate constitutes perpendicular；The annular spiral shell is set on two groups of innermost layer and middle layer
Among the box of cross bar composition, and it is affixed with the frame around box.
4. a kind of prefabricated shield duct piece of evaluation according to claim 1 conserves the device of critical intensity with type concrete steam,
It is characterized in that：The hydraulic jack is national standard JC473-92《Concrete pressure bleeding instrument》In hydraulic jack used
Top, which includes 1 jack of one end and 1 oil pump of the other end, is oil between jack and oil pump
Pipe, one end of oil pipe excessively is connected by quick coupling with hydraulic pressure threeway, hydraulic pressure threeway is connect with jack and pressure gauge respectively,
The other end for crossing oil pipe is connected by quick coupling with oil pump；The oil pump includes the oily cylinder of tubulose and the compression bar of tubulose；Institute
It includes carrying the probe swivel nut of external screw thread and internal thread and carrying externally threaded probe to state detection device, and probe swivel nut passes through outer spiral shell
Line is attached to the jack at end, is connected to the probe of its lower end by internal thread；The probe total height 80MM, including it is upper
Lower two parts, probe top are matched with external screw thread and diameter and height with probe swivel nut, and probe upper height is 10MM, directly
Diameter is 13.5MM；Probe lower height is 70MM, a diameter of 40MM, and probe lower part is divided into have scale area and without scale area, have
Scale area is the probe area from the upward 50MM of probe base, is a scale area per 5MM.
5. being conserved according to a kind of evaluation prefabricated shield duct piece type concrete steam described in Claims 1-4 any one critical strong
The detection method of the device of degree, it is characterised in that：Include the following steps：
Step 1: setting is quiet to stop parameter：The type concrete steam maintenance quiet stopping time for presetting several separated in time is long, to divide
Analyse it is quiet stop how long after concrete strength can just resist steam-cured destruction；
Step 2: setting synchronous point：The synchronous point is each quiet stopping time length and the production scene of test in laboratory critical intensity
Each quiet stopping time length of the corresponding concrete pipe sheet of production is corresponding or equal；The synchronous point further includes laboratory and production scene
Using the concrete and concrete mix of the same lot number；
Step 3: setting is the same as batch production：Multiple concrete pipe sheets that production scene is grown with the batch production corresponding different quiet stopping times,
Production process includes preparation stage before quiet stop, quiet stops stage, steam curing stage；
Step 4: laboratory synchronous production is live, simulation enter that concrete pipe sheet is quiet and stop before preparation stage；
Step 5: laboratory synchronous production is live, simulation enter before each steam curing it is quiet stop the stage, be respectively adopted it is corresponding not
With the detection cylinder of length of quiet stopping time, its injection intensity is detected with same method；
Step 6: evaluation, obtains concrete steam-cured critical intensity.
6. a kind of prefabricated shield duct piece of evaluation according to claim 5 conserves the device of critical intensity with type concrete steam
Detection method, it is characterised in that：The quiet stopping time for presetting several separated in time of the step 1 is long, generally with 20 minutes
Or 30 minutes time intervals as different quiet stopping time length.
7. a kind of prefabricated shield duct piece of evaluation according to claim 5 conserves the device of critical intensity with type concrete steam
Detection method, it is characterised in that：The laboratory synchronous production scene of the step 4, before simulation enters that concrete pipe sheet is quiet and stops
Preparation stage, detailed process are：
(1) the quantity of the detection cylinder of the corresponding concrete pipe sheet per a kind of quiet stopping time length of setting is 3；
(2) the concrete mix of the corresponding concrete pipe sheet per a kind of quiet stopping time length is separately filled with respective 3 detection buckets,
And simultaneously by the concrete mix vibration compacting in respective 3 detection buckets；
(3) enable the concrete mix after vibration compacting enter and respective quiet stop the stage.
8. a kind of prefabricated shield duct piece of evaluation according to claim 5 conserves the device of critical intensity with type concrete steam
Detection method, it is characterised in that：The step 5 detects its injection intensity with same method,
Detailed process is：
(1) the quiet of laboratory synchronous production scene stops the period, by the coagulation after corresponding different quiet stopping times length and completion vibration compacting
Soil, which enters, respective quiet stops the period；
(2) 3 concrete NDT cylinders for completing current quiet stopping time length are put into successively on detection support bottom plate；
(3) the check valves of hydraulic jack are tightened before jack probe penetration concrete；
(4) press repeatedly hydraulic jack compression bar the probe of jack is extended downwardly, with holder bottom plate on detection bucket in
Concrete surface flushes；
(5) very heavy compression bar is pressed repeatedly again, until 20mm inside its probe penetration concrete；
(6) this pressure gauge reading is recorded, 0.5MPa is accurate to, being denoted as the quiet stopping time grows the concrete of the corresponding detection bucket and pass through
Enter intensity；
(7) repeat (2) to (6) walking, until the concrete strength inspection that will complete 3 concrete NDT buckets of current quiet stopping time length is complete
Finish；
(8) sequential selection completes 3 concrete NDT cylinders of next quiet stopping time length, and repeats (2) to (7) walking.
9. a kind of prefabricated shield duct piece of evaluation according to claim 5 conserves the device of critical intensity with type concrete steam
Detection method, it is characterised in that：The evaluation of the step 6 obtains concrete steam-cured critical intensity, specific as follows：
(1) the average value of the injection intensity detected using 3 detection buckets of corresponding each quiet stopping time length is passed through as what is tested every time
Enter intensity；
In the maximum value or minimum value of 3 detection bucket injection intensity there are one and median difference be more than median 10%
When, it should be using median as the injection intensity tested every time；
(3) when maxima and minima is more than the 10% of median, should test again；
(4) after the different quiet corresponding injection intensity of stopping time length of comparison and corresponding different quiet stopping time long production scenes are steam-cured outside section of jurisdiction
The not cracked critical point of cambered surface, obtains steam-cured critical intensity；The not cracked critical point is outside steam-cured rear section of jurisdiction
Pressure gauge intensity value when the corresponding quiet stopping time is long when cambered surface is not cracked, the pressure gauge volume unit are megapascal.
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