CN108593896A - Fully graded concrete is unstressed strain gauge means and measurement method - Google Patents
Fully graded concrete is unstressed strain gauge means and measurement method Download PDFInfo
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- CN108593896A CN108593896A CN201810420254.7A CN201810420254A CN108593896A CN 108593896 A CN108593896 A CN 108593896A CN 201810420254 A CN201810420254 A CN 201810420254A CN 108593896 A CN108593896 A CN 108593896A
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- 239000004567 concrete Substances 0.000 title claims abstract description 71
- 238000000691 measurement method Methods 0.000 title claims abstract description 17
- 238000005259 measurement Methods 0.000 claims abstract description 15
- 238000004458 analytical method Methods 0.000 claims abstract description 5
- 238000010276 construction Methods 0.000 claims abstract description 4
- 239000011888 foil Substances 0.000 claims description 16
- 239000002184 metal Substances 0.000 claims description 13
- 229910052751 metal Inorganic materials 0.000 claims description 13
- 239000010426 asphalt Substances 0.000 claims description 11
- 238000001179 sorption measurement Methods 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 239000007787 solid Substances 0.000 claims description 7
- 238000012544 monitoring process Methods 0.000 claims description 6
- 230000005540 biological transmission Effects 0.000 claims description 5
- 239000000314 lubricant Substances 0.000 claims description 5
- 230000002093 peripheral effect Effects 0.000 claims description 5
- 239000002985 plastic film Substances 0.000 claims description 5
- 229920006255 plastic film Polymers 0.000 claims description 5
- 238000012545 processing Methods 0.000 claims description 5
- 238000010521 absorption reaction Methods 0.000 claims 1
- 238000005516 engineering process Methods 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract 1
- 230000035882 stress Effects 0.000 description 22
- 238000010586 diagram Methods 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000009434 installation Methods 0.000 description 3
- 238000012216 screening Methods 0.000 description 3
- 230000003321 amplification Effects 0.000 description 2
- 230000015271 coagulation Effects 0.000 description 2
- 238000005345 coagulation Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 206010007247 Carbuncle Diseases 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000006355 external stress Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/38—Concrete; Lime; Mortar; Gypsum; Bricks; Ceramics; Glass
- G01N33/383—Concrete or cement
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/32—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring the deformation in a solid
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- General Health & Medical Sciences (AREA)
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- Pathology (AREA)
- On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
Abstract
The present invention relates to concrete technology parameter measurement fields, it is intended to solve the problems, such as that existing concrete strain measurement precision is low, provide the unstressed strain gauge means of fully graded concrete and measurement method.Fully graded concrete is unstressed, and strain measurement method is included in that basal diameter is reserved in Concrete Dam Construction storehouse surface is D, the cylindrical hole that depth is L；After waiting for periphery concrete final set, it is placed in a unstressed bucket into hole, strain gauge is laid into the inner cavity of unstressed bucket；Fully graded concrete is poured into the inner cavity of unstressed bucket, pours depth L1s of the height h1 less than the inner cavity of unstressed bucket；After concrete initial set in unstressed bucket, strain gauge initial value is taken；Next storehouse concrete is poured, unstressed bucket is covered；Strain gauge numerical value is continued to monitor, analysis calculates the unstressed strain of fully graded concrete.The beneficial effects of the invention are as follows the influences that can ensure effectively to avoid or as far as possible reduce extraneous stress so that the measured value of strain gauge is accurate enough.
Description
Technical field
The present invention relates to concrete technology parameter measurement fields, in particular to the unstressed strain of fully graded concrete
Measuring device and measuring method.
Background technology
It is current common as the unstressed strain measurement method of dam concrete is used for and Strain Meter Set matches, Measurement of Dam
Internal stress state.Since Strain Meter Set installation accuracy is easily disturbed, fully graded concrete, therefore, nothing should not be nearby filled
In stress meter bucket and Strain Meter Set nearby fills wet screening graduation two concrete.
It is obtained however, analysis temperature stress emulated to dam concrete at present and temperature control all rely on unstressed meter measurement
The material parameters such as the linear expansion coefficient, the autogenous volumetric deformation that take.Since what is filled in unstressed meter bucket is wet screening graduation two coagulation
Soil, therefore, the material parameter of actual measurement can not reflect the genuine property of fully graded concrete in dam.
On the other hand, the simply amplification of the size of existing unstressed strain gauge means can not be solved the problems, such as this.Cause
For, 1. existing unstressed meter bucket is the double-deck sheet iron bucket, it is double-deck between there are gap to completely cut off the interference of barrel external carbuncle, but staving
Buckling easily, which is occurred, by lateral compression causes unstressed environment to be lost, and occurs to bend in installation, process of vibrating after the amplification of staving size
Bent possibility also increases；2. the strain gauge gauge length that existing unstressed strain measurement uses is smaller, using fully graded concrete
Afterwards, measured value is easily influenced by large-particle-size aggregate spatial distribution position；3. the fixed form of existing strain gauge is more simple, use
Strain gauge is fixed on axis line position in bucket by iron wire, and the mode of plugging and pounding, which can be used, when using wet screening graduation two concrete is molded, and
Using molding of vibrating is needed when fully graded concrete, the position of strain gauge is easily disturbed.
Invention content
The present invention is intended to provide a kind of unstressed strain measurement method of fully graded concrete, to solve the above problems.
It is above-mentioned to solve another object of the present invention is to provide a kind of unstressed strain gauge means of fully graded concrete
Problem.
What the embodiment of the present invention was realized in：
The embodiment of the present invention provides a kind of unstressed strain measurement method of fully graded concrete comprising：
It is D, the cylindrical hole that depth is L that basal diameter is reserved in Concrete Dam Construction storehouse surface；Wait for that periphery concrete is whole
After solidifying, it is placed in a unstressed bucket into hole, strain gauge is laid into the inner cavity of the unstressed bucket, the conducting wire of strain gauge extends
Go out except unstressed bucket；
Fully graded concrete is poured into the inner cavity of unstressed bucket, pours depth of the height h1 less than the inner cavity of unstressed bucket
L1；
After concrete initial set in unstressed bucket, strain gauge initial value is taken；
Next storehouse concrete is poured, unstressed bucket is covered；
Strain gauge numerical value is continued to monitor, analysis calculates the unstressed strain of fully graded concrete.
In an embodiment of the present embodiment：
The height L1 of the inner cavity of the unstressed bucket is not less than 3 times of its basal diameter D1；The height h1 that pours is equal to
2 times of the basal diameter D of the inner cavity of the unstressed bucket, and it is layered vibration compacting.
In an embodiment of the present embodiment：
Thermometer is incidentally set at the strain gauge；
The numerical value of monitoring temperature meter while monitoring strain gauge numerical value brings strain value for eliminating temperature value
Measured deviation.
In an embodiment of the present embodiment：
The bucket wall of the unstressed bucket is solid bucket wall, and the bucket wall limits the inner cavity of the unstressed bucket；The nothing
The bucket wall of stress bucket includes metal outer barrel wall and attaches to the inner barrel wall on the inside of the metal outer barrel wall；The inner barrel wall is can
The sponge layer structure of compression indent, and the medial surface of the inner barrel wall is attached to bitumen layer.
In an embodiment of the present embodiment：
Wall thickness s >=10mm of the metal outer barrel wall；Basal diameter D >=450mm of the inner cavity of the unstressed bucket.
In an embodiment of the present embodiment：
The strain gauge includes hollow pipe fitting；Foil gauge, the hollow pipe fitting are attached on the inner wall of the hollow pipe fitting
Both ends be respectively perpendicular and be connected with diskware, the diskware positioned at upper end offers the hole being pierced by for the conducting wire of foil gauge.
In an embodiment of the present embodiment：
Connection structure of the connection for fixing strain gauge on the inside of the unstressed bucket；The connection structure includes two cross
To fixing line and a vertical fixing line；
The vertical fixing line is arranged along the central axes of the unstressed bucket, and is connected to the bottom wall of the bucket wall；Two
The transverse direction fixing line is distributed along the axially spaced-apart of the unstressed bucket, and two lateral fixing lines are in parallel with each other along institute
State the inner surface of the peripheral wall for extending radially to be connected to barrel wall of unstressed bucket；The vertical fixing line and two transverse directions are solid
Alignment is fixedly connected in intersection respectively；
The strain gauge extends along the vertical fixing line and is fixedly connected on the vertical fixing line and two cross
To in fixing line.
In an embodiment of the present embodiment：
It is smooth surface by the outer surface of the hollow pipe fitting, to reduce shear stress transmission and water adsorption；
The hollow pipe fitting outer surface is formed into smooth surface by mechanical processing；Or it is coated outside the hollow pipe fitting
Bitumen layer or lubricant layer form smooth surface；Or form smooth surface in the hollow pipe fitting outer wrapping plastic film.
In an embodiment of the present embodiment：
The inner cavity of the unstressed bucket is in a free state cylindrical cavity, is limited by the inner surface of the inner barrel wall,
And it can expand by under being filled in the pressure of concrete therein.
The embodiment of the present invention also provides a kind of unstressed strain gauge means of fully graded concrete comprising strain gauge and nothing
Stress bucket；
The inner cavity of the unstressed bucket is cylindrical cavity, and its inner surface is coated with the bitumen layer of insulating water-proof；
The strain gauge is set in the inner cavity of the unstressed bucket, and along the central axes of the unstressed bucket setting and and
The unstressed bucket is relatively fixed；
The strain gauge includes vertically setting and the hollow pipe fitting that both ends are screw thread mouth；In the midpoint of the hollow pipe fitting
Foil gauge is attached on wall, the both ends of the hollow pipe fitting, which are respectively perpendicular, is connected with diskware, and the diskware positioned at upper end opens up
There is the hole that the conducting wire for foil gauge is pierced by；The outer surface of the hollow pipe fitting be smooth surface, with reduce shear stress transmit and
Water adsorption.
In summary it describes, the present embodiment can ensure effectively to avoid or as far as possible reduce the influence of extraneous stress so that
The measured value of strain gauge is accurate enough.
Description of the drawings
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below will be to needed in the embodiment attached
Figure is briefly described, it should be understood that the following drawings illustrates only certain embodiments of the present invention, therefore is not construed as pair
The restriction of range for those of ordinary skill in the art without creative efforts, can also be according to this
A little attached drawings obtain other relevant attached drawings.
Fig. 1 is the structural schematic diagram of the unstressed strain gauge means of fully graded concrete in the embodiment of the present invention；
Fig. 2 is the structural schematic diagram of the unstressed bucket in the embodiment of the present invention；
Fig. 3 is enlarged drawing at the A of Fig. 2；
Fig. 4 is the structural schematic diagram of the strain gauge in Fig. 1.
Icon：100- fully graded concretes are unstressed strain gauge means；10- is unstressed bucket；11- barrels of walls；11a- metals
Outer barrel wall；11b- inner barrel walls；11c- bitumen layers；12- connection structures；12a- transverse direction fixing lines；The vertical fixing lines of 12b-；20- is answered
Become meter；21- hollow pipe fittings；22- diskwares；22a- disk bodies；22b- connectors；23- foil gauges；23a- conducting wires；2a- smooth surfaces；
The inner cavities Q1-；30- concrete.
Specific implementation mode
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.The present invention being usually described and illustrated herein in the accompanying drawings is implemented
The component of example can be arranged and be designed with a variety of different configurations.
Therefore, below the detailed description of the embodiment of the present invention to providing in the accompanying drawings be not intended to limit it is claimed
The scope of the present invention, but be merely representative of the present invention selected embodiment.Based on the embodiments of the present invention, this field is common
The every other embodiment that technical staff is obtained without making creative work belongs to the model that the present invention protects
It encloses.
It should be noted that：Similar label and letter indicate similar terms in following attached drawing, therefore, once a certain Xiang Yi
It is defined, then it further need not be defined and explained in subsequent attached drawing in a attached drawing.
In the description of the present invention, it should be noted that if occur term "center", "upper", "lower", "left", "right",
The orientation or positional relationship of the instructions such as "vertical", "horizontal", "inner", "outside" is to be based on the orientation or positional relationship shown in the drawings,
Either the invention product using when the orientation or positional relationship usually put, be merely for convenience of the description present invention and simplification retouched
It states, does not indicate or imply the indicated device or element must have a particular orientation, with specific azimuth configuration and operation,
Therefore it is not considered as limiting the invention.If only being used in addition, occurring term " first ", " second " etc. in description of the invention
It is described in distinguishing, is not understood to indicate or imply relative importance.
If being not offered as requiring component absolute in addition, occurring the terms such as term "horizontal", "vertical" in description of the invention
Horizontal or pendency, but can be slightly tilted.If "horizontal" refers to only that its direction is more horizontal with respect to for "vertical", not
It is to indicate that the structure is had to fully horizontally, but can be slightly tilted.
In the description of the present invention, it is also necessary to which explanation is unless specifically defined or limited otherwise, if there is term
" setting ", " installation ", " connected ", " connection " shall be understood in a broad sense, and can also be detachably to connect for example, it may be being fixedly connected
It connects, or is integrally connected；It can be mechanical connection, can also be electrical connection；It can be directly connected, intermediate matchmaker can also be passed through
Jie is indirectly connected, and can be the connection inside two elements.It for the ordinary skill in the art, can be with concrete condition
Understand the concrete meaning of above-mentioned term in the present invention.
Embodiment
Fig. 1 is the structural schematic diagram of the unstressed strain gauge means of fully graded concrete in the embodiment of the present invention 100；Figure
2 be the structural schematic diagram of the unstressed bucket 10 in Fig. 1；Fig. 3 is enlarged drawing at the A of Fig. 2；Fig. 4 is the knot of the strain gauge 20 in Fig. 1
Structure schematic diagram.
Cooperation is referring to Fig. 2, Fig. 3, and the bucket wall 11 of the unstressed bucket 10 in the present embodiment is solid bucket wall, and bucket wall 11 limits
The inner cavity Q1 of unstressed bucket 10；Bucket wall 11 at this includes the peripheral wall and bottom wall of unstressed bucket 10.The bucket wall 11 of unstressed bucket 10
Including metal outer barrel wall 11a and attach to the inner barrel wall 11b on the inside of metal outer barrel wall 11a；Inner barrel wall 11b is the indent that can be pressurized
Sponge layer structure, and the medial surface of inner barrel wall 11b is attached to bitumen layer 11c.Optionally, the inner cavity Q1 of unstressed bucket 10
It is in a free state cylindrical cavity, is limited by the inner surface of inner barrel wall 11b, and concrete therein can be filled in
Expand under 30 pressure.The setting of bitumen layer 11c can play the purpose of reducing stress transfer, insulating water-proof.Sponge layer knot
The inner barrel wall 11b of structure can be compressed when concrete 30 expands to give concrete 30 certain deformation space, and deformation is avoided to produce
The accuracy of raw internal stress influence measurement result.
In the present embodiment, to ensure that external stress is isolated in barrel wall 11, bucket wall 11 is arranged to have sizable wall thickness, such as
Wall thickness s >=10m of metal outer barrel wall 11a.Optionally, wall thickness s is selected according to actual conditions between 10m to 15m.Bucket opening again
Place is affected by extraneous stress, be easy to cause can not the actual ess-strain value of Correct, it is unstressed in the present embodiment
The depth L1 of the inner cavity Q1 of bucket 10 is set as 3 times not less than its basal diameter D1.The basal diameter of inner cavity Q1 should not mistake simultaneously
It is small, basal diameter D1 >=450mm of the inner cavity Q1 of unstressed bucket 10 in the present embodiment.When meeting above-mentioned condition, strain measurement value
The error of opposite actual strain value is can be controlled within 2.5%, meets requirement of engineering.
Based on above-mentioned consideration, the present embodiment provides one group of preferably values：D1=600mm, L1=2000m, s=12m.Examination
The error for verifying the bright opposite actual strain value of strain measurement value under this group of numerical value is no more than 0.3%.
In the present embodiment, for convenience of the connection of strain gauge 20,10 inside of unstressed bucket is also associated with for fixing strain gauge
20 connection structure 12；Connection structure 12 includes a two transverse direction fixing line 12a and vertical fixing line 12b；Vertical fixing line
12b is arranged along the central axes of unstressed bucket 10, and is connected to the bottom wall of barrel wall 11；Two transverse direction fixing line 12a are along unstressed bucket
10 axially spaced-apart distribution, and two transverse direction fixing line 12a extend radially to be connected to along unstressed bucket 10 in parallel with each other
The inner surface of the peripheral wall of bucket wall 11；Vertical fixing line 12b and two transverse direction fixing line 12a is fixedly connected in intersection respectively.It is logical
Crossing the connection structure 12 may make strain gauge 20 to obtain relatively firm connection, its position in casting concrete 30 can be avoided to become
It is dynamic.
Referring to Fig. 4, in the present embodiment, strain gauge 20 is used for unstressed strain measurement；Strain gauge 20 includes hollow pipe fitting 21；
On the inner wall of hollow pipe fitting 21 foil gauge 23, the both ends difference of hollow pipe fitting 21 are attached with by modes such as bonding, welding
It is vertically connected with diskware 22, the diskware 22 positioned at upper end offers the hole being pierced by for the conducting wire 23a of foil gauge 23.Foil gauge 23
The length of hollow pipe fitting 21 be may be provided to centre position.
In a kind of embodiment of the embodiment of the present invention, the outer surface of hollow pipe fitting 21 is smooth surface 2a, to reduce
Shear stress transmits and water adsorption.Extraneous stress interference is shielded by hollow pipe fitting 21, in being transmitted stresses to by diskware 22
Blank pipe part 21 so that the strain gauge 20 in hollow pipe fitting 21 can accurately incude and measure vertical strain.And hollow pipe fitting 21
Outer surface be arranged to smooth surface 2a and avoid shearing force or water adsorption by the concrete 30 in the outside of hollow pipe fitting 21
Measurement result is influenced in surface, and there is the sufficiently exact advantageous effect of measured value.Optionally, smooth surface 2a is by hollow pipe fitting 21
Outer surface is obtained by mechanical processing, or：Smooth surface 2a outside hollow pipe fitting 21 by coating bitumen layer 11c or lubricant
Layer and obtain, or：Smooth surface 2a is obtained by by 21 outer wrapping plastic film of hollow pipe fitting.
In the present embodiment, the both ends of hollow pipe fitting 21 are screw thread mouth, diskware 22 close to hollow pipe fitting 21 one side vertically to
The outer connector 22b for extending to form the screw thread mouth for being threadedly coupled hollow pipe fitting 21 so that hollow pipe fitting 21 is in side projection
It is in T shape.Hollow pipe fitting 21 and diskware 22 are steel structure or are made of with preferable mechanical property metal material other.
Optionally, diskware 22 may include the disk body 22a of circular plate and vertically prolong from the centre position of disk body 22a one sides
The connector 22b to be formed is stretched to constitute.External screw thread is arranged in the outer surfaces connector 22b, the screw thread for the both ends with hollow pipe fitting 21
Mouth, which is constituted, to be threadedly coupled.
Referring to Fig. 1, the present embodiment also provides the unstressed strain gauge means of a kind of fully graded concrete 100 comprising preceding
State strain gauge 20 and unstressed bucket 10 above-mentioned；Strain gauge 20 is set in the inner cavity Q1 of unstressed bucket 10, and along unstressed bucket
10 central axes are arranged and are relatively fixed with unstressed bucket 10.
Strain gauge 20 in the present embodiment includes vertically setting and the hollow pipe fitting 21 that both ends are screw thread mouth；Hollow pipe fitting
Foil gauge 23 is bonded or welded on 21 midpoint inner wall, the both ends of hollow pipe fitting 21 are threaded with diskware 22, are located at respectively
The top of the diskware 22 of upper end is provided with the hole being pierced by for the conducting wire 23a of foil gauge 23.
The outer surface of hollow pipe fitting 21 is smooth surface 2a, to reduce shear stress transmission and water adsorption；Smooth surface
2a is obtained by 21 outer surface of hollow pipe fitting by mechanical processing, or：Smooth surface 2a is dripped by being coated outside hollow pipe fitting 21
Cyan layer 11c or lubricant layer and obtain, or：Smooth surface 2a is obtained by by 21 outer wrapping plastic film of hollow pipe fitting.Pass through
It is set as smooth surface 2a, the reduction shear stress that can reduce between concrete 30 and middle pipe pipe fitting transmits so that strain gauge 20
Measurement result it is accurate.
In summary it describes：
Unstressed bucket 10 in the present embodiment can ensure that inside has certain unstressed environment for installing strain gauge
20, to avoid or as far as possible reduce extraneous stress influence so that the measured value of strain gauge 20 is accurate enough；
Extraneous stress interference is shielded by hollow pipe fitting 21, hollow pipe fitting 21 is transmitted stresses to by diskware 22 so that
Strain gauge 20 in hollow pipe fitting 21 can accurately incude and measure vertical strain, avoid the coagulation by 21 outside of hollow pipe fitting
Measurement result is influenced in the shearing force of soil 30 or the surface of water adsorption, there is the sufficiently exact advantageous effect of measured value.
The embodiment of the present invention also provides a kind of unstressed strain measurement method of fully graded concrete comprising：
It is D, the cylindrical hole that depth is L that basal diameter is reserved in concrete construction storehouse surface；Wait for periphery concrete final set
Later, it is placed in unstressed bucket 10 (outer diameter D) for example above-mentioned into hole, strain gauge is laid into the inner cavity Q1 of unstressed bucket 10
20, the conducting wire 23a of strain gauge 20 extends except unstressed bucket 10；
Fully graded concrete 30 is poured into the inner cavity Q1 of unstressed bucket 10, it is interior less than unstressed bucket 10 to pour height h1
The depth L1 of chamber Q1；
After 30 initial set of concrete in unstressed bucket 10,20 initial value of strain gauge is taken；
Next storehouse concrete 30 is poured, unstressed bucket 10 is covered；
20 numerical value of strain gauge is continued to monitor, analysis calculates the unstressed strain of fully graded concrete 30.
Optionally, as before, the depth L1 of the inner cavity Q1 of unstressed bucket 10 is not less than 3 times of its basal diameter D1.At this point, pouring
Build basal diameter D of the height equal to the inner cavity Q1 of unstressed bucket 10 2 times, and it is layered vibration compacting.
In one embodiment, thermometer (not shown) is incidentally set at strain gauge 20；In monitoring strain gauge
The numerical value of monitoring temperature meter while 20 numerical value, the measured deviation that strain value is brought for eliminating temperature value.
Optionally, and it is described above consistent, the bucket wall 11 of unstressed bucket 10 is solid bucket wall 11, and bucket wall 11 limits nothing
The inner cavity Q1 of stress bucket 10；The bucket wall 11 of unstressed bucket 10 includes metal outer barrel wall 11a and attaches on the inside of metal outer barrel wall 11a
Inner barrel wall 11b；Inner barrel wall 11b is the sponge layer structure of indent of capable of being pressurized, and the medial surface of inner barrel wall 11b is attached to
Bitumen layer 11c.
Optionally, with consistent above, wall thickness s >=m of metal outer barrel wall 11a；The bottom surface of the inner cavity Q1 of unstressed bucket 10 is straight
Diameter D >=450mm.
Optionally, with it is consistent above, strain gauge 20 include vertically setting and both ends be screw thread mouth hollow pipe fitting 21；In
Foil gauge 23 is bonded or welded on the midpoint inner wall of blank pipe part 21, the both ends of hollow pipe fitting 21 are threaded with diskware respectively
22, the hole being pierced by for the conducting wire 23a of foil gauge 23 is provided with positioned at the top of the diskware 22 of upper end.
Optionally, with it is consistent above, in connection structure 12 of the inside of unstressed bucket 10 connection for fixing strain gauge 20；Even
Binding structure 12 includes a two transverse direction fixing line 12a and vertical fixing line 12b；Vertical fixing line 12b is along unstressed bucket 10
Central axes are arranged, and are connected to the bottom wall of barrel wall 11；Two transverse direction fixing line 12a are distributed along the axially spaced-apart of unstressed bucket 10,
And two transverse direction fixing line 12a are in parallel with each other along the interior table of the peripheral wall for extending radially to be connected to barrel wall 11 of unstressed bucket 10
Face；Vertical fixing line 12b and two transverse direction fixing line 12a is fixedly connected in intersection respectively；
Vertically fixing line 12b extends and is fixedly connected on vertical fixing line 12b and two lateral fixing lines to strain gauge 20
On 12a.
Optionally, with it is consistent above, by the outer surface of hollow pipe fitting 21 be smooth surface 2a, with reduce shear stress transmission
And water adsorption；21 outer surface of hollow pipe fitting is formed into smooth surface 2a by mechanical processing；Or it is applied outside hollow pipe fitting 21
It covers bitumen layer 11c or lubricant layer forms smooth surface 2a；Or form smooth table in 21 outer wrapping plastic film of hollow pipe fitting
Face 2a.
Optionally, with it is consistent above, the inner cavity Q1 of unstressed bucket 10 is in a free state cylindrical cavity, by inner barrel wall
The inner surface of 11b limits, and can expand by under being filled in the pressure of concrete 30 therein.
In summary it describes, the present embodiment can ensure effectively to avoid or as far as possible reduce the influence of extraneous stress so that
The measured value of strain gauge 20 is accurate enough.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, any made by repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of unstressed strain measurement method of fully graded concrete, which is characterized in that including：
It is D, the cylindrical hole that depth is L that basal diameter is reserved in Concrete Dam Construction storehouse surface；Wait for periphery concrete final set it
Afterwards, it is placed in a unstressed bucket into hole, strain gauge is laid into the inner cavity of the unstressed bucket, the conducting wire of strain gauge extends nothing
Except stress bucket；
Fully graded concrete is poured into the inner cavity of unstressed bucket, pours depth L1s of the height h1 less than the inner cavity of unstressed bucket；
After concrete initial set in unstressed bucket, strain gauge initial value is taken；
Next storehouse concrete is poured, unstressed bucket is covered；
Strain gauge numerical value is continued to monitor, analysis calculates the unstressed strain of fully graded concrete.
2. the unstressed strain measurement method of fully graded concrete according to claim 1, it is characterised in that：
The height L1 of the inner cavity of the unstressed bucket is not less than 3 times of its basal diameter D1；The height h1 that pours is equal to described
2 times of the basal diameter D of the inner cavity of unstressed bucket, and it is layered vibration compacting.
3. the unstressed strain measurement method of fully graded concrete according to claim 1, it is characterised in that：
Thermometer is incidentally set at the strain gauge；
The numerical value of monitoring temperature meter, the measurement that strain value is brought for eliminating temperature value while monitoring strain gauge numerical value
Deviation.
4. the unstressed strain measurement method of fully graded concrete according to claim 1, it is characterised in that：
The bucket wall of the unstressed bucket is solid bucket wall, and the bucket wall limits the inner cavity of the unstressed bucket；It is described unstressed
The bucket wall of bucket includes metal outer barrel wall and attaches to the inner barrel wall on the inside of the metal outer barrel wall；The inner barrel wall is that can be pressurized
The sponge layer structure of indent, and the medial surface of the inner barrel wall is attached to bitumen layer.
5. the unstressed strain measurement method of fully graded concrete according to claim 4, it is characterised in that：
Wall thickness s >=10mm of the metal outer barrel wall；Basal diameter D >=450mm of the inner cavity of the unstressed bucket.
6. the unstressed strain measurement method of fully graded concrete according to claim 4, it is characterised in that：
The strain gauge includes hollow pipe fitting；It is attached with foil gauge on the inner wall of the hollow pipe fitting, the two of the hollow pipe fitting
End is respectively perpendicular and is connected with diskware, and the diskware positioned at upper end offers the hole being pierced by for the conducting wire of foil gauge.
7. the unstressed strain measurement method of fully graded concrete according to claim 6, it is characterised in that：
Connection structure of the connection for fixing strain gauge on the inside of the unstressed bucket；The connection structure includes that two transverse directions are solid
Alignment and a vertical fixing line；
The vertical fixing line is arranged along the central axes of the unstressed bucket, and is connected to the bottom wall of the bucket wall；Described in two
Lateral fixing line is distributed along the axially spaced-apart of the unstressed bucket, and two lateral fixing lines are in parallel with each other along the nothing
The inner surface of the peripheral wall for extending radially to be connected to barrel wall of stress bucket；The vertical fixing line and two lateral fixing lines
It is fixedly connected respectively in intersection；
The strain gauge extends along the vertical fixing line and is fixedly connected on the vertical fixing line and two transverse directions are solid
On alignment.
8. the unstressed strain measurement method of fully graded concrete according to claim 6, it is characterised in that：
It is smooth surface by the outer surface of the hollow pipe fitting, to reduce shear stress transmission and water adsorption；
The hollow pipe fitting outer surface is formed into smooth surface by mechanical processing；Or coat pitch outside the hollow pipe fitting
Layer or lubricant layer form smooth surface；Or form smooth surface in the hollow pipe fitting outer wrapping plastic film.
9. the unstressed strain measurement method of fully graded concrete according to claim 4, it is characterised in that：
The inner cavity of the unstressed bucket is in a free state cylindrical cavity, is limited by the inner surface of the inner barrel wall, and energy
It is enough to expand by under being filled in the pressure of concrete therein.
10. a kind of unstressed strain gauge means of fully graded concrete, it is characterised in that：
Including strain gauge and unstressed bucket；
The inner cavity of the unstressed bucket is cylindrical cavity, and its inner surface is coated with the bitumen layer of insulating water-proof；
The strain gauge is set in the inner cavity of the unstressed bucket, and along the central axes of the unstressed bucket be arranged and with it is described
Unstressed bucket is relatively fixed；
The strain gauge includes vertically setting and the hollow pipe fitting that both ends are screw thread mouth；On the midpoint inner wall of the hollow pipe fitting
It is attached with foil gauge, the both ends of the hollow pipe fitting, which are respectively perpendicular, is connected with diskware, and the diskware positioned at upper end offers confession
The hole that the conducting wire of foil gauge is pierced by；The outer surface of the hollow pipe fitting is smooth surface, to reduce shear stress transmission and moisture
Absorption.
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| CN201810420254.7A CN108593896B (en) | 2018-05-04 | 2018-05-04 | Full-graded concrete stress-free strain measuring device and measuring method |
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| CN201810420254.7A CN108593896B (en) | 2018-05-04 | 2018-05-04 | Full-graded concrete stress-free strain measuring device and measuring method |
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| CN109443231A (en) * | 2018-12-22 | 2019-03-08 | 中国地质大学（武汉） | It is a kind of by Fibre Optical Sensor it is unstressed based on |
| CN109682511A (en) * | 2019-01-15 | 2019-04-26 | 河海大学 | A kind of device and method using steel fiber reinforced concrete aggregate measurement extruding force |
| CN110006329A (en) * | 2019-04-17 | 2019-07-12 | 长江空间信息技术工程有限公司(武汉) | The unstressed meter test device of waterproof and installation method inside large volume low-heat concrete |
| CN110043221A (en) * | 2019-05-31 | 2019-07-23 | 中国海洋石油集团有限公司 | A kind of device measuring cementing concrete ring microannulus |
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| CN113532370A (en) * | 2021-06-11 | 2021-10-22 | 中国建筑第八工程局有限公司 | Deformation measuring method for bidirectional sheared concrete member |
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| CN110864839A (en) * | 2019-12-31 | 2020-03-06 | 福州大学 | Internal stress monitoring device for cement concrete pavement slab and using method thereof |
| CN112014210A (en) * | 2020-08-07 | 2020-12-01 | 中国三峡建设管理有限公司 | Method for predicting real strength performance of dam low-heat cement full-graded concrete |
| CN113532370A (en) * | 2021-06-11 | 2021-10-22 | 中国建筑第八工程局有限公司 | Deformation measuring method for bidirectional sheared concrete member |
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