CN110426256A - A kind of triangular pyramid fixture and preparation method for being used to prepare band and splitting concrete sample - Google Patents
A kind of triangular pyramid fixture and preparation method for being used to prepare band and splitting concrete sample Download PDFInfo
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- CN110426256A CN110426256A CN201910707203.7A CN201910707203A CN110426256A CN 110426256 A CN110426256 A CN 110426256A CN 201910707203 A CN201910707203 A CN 201910707203A CN 110426256 A CN110426256 A CN 110426256A
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- concrete sample
- triangular pyramid
- steel wire
- fixture
- concrete
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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
- G01B21/16—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 distance of clearance between spaced objects
-
- 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
-
- 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
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
-
- 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
- G01N1/36—Embedding or analogous mounting of samples
-
- 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
- G01N1/36—Embedding or analogous mounting of samples
- G01N2001/366—Moulds; Demoulding
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The present invention relates to a kind of triangular pyramid fixtures and preparation method for being used to prepare band and splitting concrete sample, this method passes through triangular pyramid fixture prefabricated trigone taper hole in concrete sample, perpendicular face where preset steel wire group in trigone taper hole tip and concrete sample, after test piece maintenance certain age, load is gradually applied to triangular pyramid fixture by press machine, and then be further applied load to prefabricated trigone taper hole, inducing concrete generates crack.The present invention develops Fracture orientation by prefabricated trigone taper hole, and it is broken suddenly after being occurred using steel wire crack preventing, by being slowly further applied load and the monitoring of fracture, it is controllable can effectively to prepare fracture width, and the band similar with Practical Project fracture pattern splits concrete sample.It is also possible to which induction multiple cracking generates, and applicability is stronger, and application value is bigger by multiple groups triangular pyramid fixture and steel wire.
Description
Technical field
The invention belongs to construction engineering technical fields, are related to a kind of triangular pyramid fixture for being used to prepare band and splitting concrete sample
And preparation method.
Background technique
For concrete structure during being actually on active service, different degrees of there are cracks, and whether the presence in crack is endangered
To concrete structure security performance, the problems such as can guaranteeing concrete structure normal use, need timely and reliably to be assessed,
The safe handling of concrete structure is guaranteed with repairing and reinforcement to damage concrete again.Thus, research band, which splits concrete performance, to be had
Significance, the research for currently splitting concrete performance to band has obtained the concern of numerous researchers, and band splits concrete sample system
It is standby, it is the important prerequisite studying crack and being influenced on it.
The method for splitting concrete preparation about band, which has much to have, to be prepared band by the method for inserted sheet and splits concrete sample,
Have and band is prepared by the method for constrained crack-ing split concrete sample, prepares band also by the method that load cracks and split concrete examination
Sample.But these methods all Shortcomings, inserted sheet method prepare band and split concrete sample, edge of crack smoother and actual
Crack difference is larger；Constrained crack-ing method prepares band and splits concrete sample, and crack randomness is larger, cannot comply fully with and be pre-designed
It is required that；And the method for existing load cracking prepares band and splits concrete sample, the abductive approach in crack is difficult to control, and is prepared band and is split
It will lead to many invalid test specimens in Concrete.
Summary of the invention
The invention proposes a kind of triangular pyramid fixtures for being used to prepare band and splitting concrete sample, it is also proposed that a kind of application should
Triangular pyramid mold, and fractue spacing and the controllable band of width split concrete sample preparation method, the band of this method preparation splits coagulation
Native test specimen is similar with practical fracture pattern.
The technical scheme adopted by the invention is as follows:
A kind of triangular pyramid fixture for being used to prepare band and splitting concrete sample, including tetra- vertex A, B, C and D, ∠ ABD=∠
ACD=90 °, the range of △ ACD=△ ABD, ∠ BAC are 5 ° to 15 °, and the range of ∠ BAD is 10 ° to 25 °.
A kind of band splits the preparation method of concrete sample, includes the following steps:
Step 1: pouring standard concrete test specimen, in casting process, several and concrete is successively uniformly placed from bottom to top
The parallel steel wire in test specimen bottom surface, more steel wires are distributed on same vertical plane, constitute a vertical steel wire group；Meanwhile passing through
Above-mentioned triangular pyramid fixture is inserted into the upper surface of concrete sample straight down, precasts trigone taper hole, in insertion process, trigone
Downward, the face ABC keeps flat perpendicular to concrete sample upper surface, and with vertical plane where the steel wire group on the vertex A of cone fixture
It goes, vertical plane where steel wire group described in the tip face of the trigone taper hole precast；After concrete sample final set, trigone is taken out
Fixture is bored, 28d is conserved；
Step 2: the concrete sample upper end after forming and conserving in step 1 is placed on press machine lower platen up
On, then, triangular pyramid fixture is inserted into prefabricated trigone taper hole, the face BCD of triangular pyramid fixture keeps vertical and close to triangular pyramid
The vertical plane in hole, the face ABC of triangular pyramid fixture are parallel to the upper surface of concrete sample；
Step 3: four side surface upper part right positions in concrete sample fix an iron plate respectively, in concrete sample
Four side surface upper part leftward positions fix a displacement sensor respectively, the four displacement sensors iron plate one with respective opposite side respectively
One is opposite；
Step 4: starting press machine, by press machine top board, press machine lower platen and triangular pyramid fixture to concrete
Test specimen is slowly further applied load, when the displacement relative to corresponding iron plate that any one in four displacement sensors measures reaches preparatory
When the displacement of setting, stop being further applied load；
Step 5: closing press machine, removes band and split concrete sample.
Further, in step 1, multiple steel wire groups are set in the concrete sample that pours, and in the upper end of concrete sample
The triangular pyramid fixture equal with steel wire group quantity is inserted into face, precasts multiple trigone taper holes, the multiple trigone taper hole is respective
Distinguish vertical plane where the corresponding steel wire group of face in tip；
Then, triangular pyramid fixture is placed one by one in each trigone taper hole, and recycle and execute step 2 to four, gradually induce more
Crack generates.
Further, in step 1, the depth that triangular pyramid fixture is inserted into concrete sample is the 1/2 to 3/4 of its height, three
Distance of the pyramid fixture away from concrete sample lateral edge is not less than 5mm.
Further, in step 1, gauge of wire is 0.5~1mm, and length is not less than the 1/2 of concrete sample side length,
It is 10-30mm with spacing between the steel wire of group.
Further, in step 4, a displacement sensor displacement data of acquisition per second, resolution ratio 0.001mm.
Further, in step 4, press machine loading speed is 20-50N/S.
The beneficial effects of the present invention are:
The present invention passes through prefabricated trigone by placing triangular pyramid fixture and steel wire group in concrete formation manufacturing process
Taper hole develops Fracture orientation, and is broken suddenly after being occurred using steel wire crack preventing, and concrete sample slowly applies
Load extends crack slowly, and with the fracture width on displacement sensor monitored concrete surface, can effectively prepare fracture width
Controllable, and the band similar with Practical Project fracture pattern splits concrete sample.It is also possible to pass through multiple groups trigone
Fixture and steel wire are bored, induction multiple cracking generates, and applicability is stronger, and application value is bigger.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of triangular pyramid fixture, wherein A, B, C, D are respectively corresponding four vertex of triangular pyramid；
Fig. 2 is steel wire and triangular pyramid pore size distribution schematic diagram (facing) in concrete sample in embodiment one；
Fig. 3 is the top view of Fig. 2；
Fig. 4 is steel wire and triangular pyramid pore size distribution top view in concrete sample in embodiment two；
Fig. 5 is steel wire and triangular pyramid pore size distribution top view in concrete sample in embodiment three；
Fig. 6 is the schematic diagram that concrete sample applies load；
Fig. 7 is that concrete sample applies in loading, the position view of trigone taper hole and triangular pyramid fixture；
Appended drawing reference: 1- steel wire, 2- concrete sample, 3- trigone taper hole, 4- triangular pyramid fixture, 5- displacement sensor, 6-
Iron plate, 7- press machine lower platen, 8- press machine top board.
Specific embodiment
With reference to the accompanying drawing with specific embodiment to the triangular pyramid for being used to prepare band and splitting concrete sample of the invention
Fixture and preparation method are described in further detail.
The triangular pyramid fixture 4 for being used to prepare band and splitting concrete sample as shown in Figure 1, including tetra- vertex A, B, C and D,
The range of ∠ ABD=∠ ACD=90 °, △ ACD=△ ABD, ∠ BAC are 5 ° to 15 °, and the range of ∠ BAD is 10 ° to 25 °.
Embodiment one (induction monolete)
A kind of band splits the preparation method of concrete sample, includes the following steps:
Step 1: pouring standard concrete test specimen 2, in casting process, several and coagulation is successively uniformly placed from bottom to top
The parallel steel wire 1 in native 2 bottom surface of test specimen, more steel wires 1 are distributed on same vertical plane, constitute a vertical steel wire group, steel wire
Plane where group is vertical with 2 upper and lower end face holding of test specimen, and the side keeping parallelism with concrete sample 2, such as the institute of Fig. 2 and 3
Show.The diameter of steel wire 1 is 0.5~1mm, and length is not less than the 1/2 of 2 side length of test specimen, and 1 spacing of steel wire with group is 10-30mm.
Meanwhile being inserted into the upper surface of concrete sample 2 straight down by above-mentioned triangular pyramid fixture 4, and precast trigone taper hole 3, three
The depth that pyramid fixture 4 is inserted into concrete sample 2 is the 1/2 to 3/4 of its height, and triangular pyramid fixture 4 is away from 2 side of concrete sample
The distance at edge is not less than 5mm.In insertion process, downward, the face ABC is perpendicular to concrete sample 2 on the vertex A of triangular pyramid fixture 4
Upper surface, and with vertical plane keeping parallelism where steel wire group, it is vertical where the tip face steel wire group of the trigone taper hole 3 precast
Face.After 2 final set of concrete sample, triangular pyramid fixture 4 is taken out, conserves 28d.It is 4 with 1 quantity of steel wire is organized in the present embodiment,
And the spacing between same group steel wire 1 is 20mm.
Step 2: 2 upper end of concrete sample after forming and conserve in step 1 is placed on press machine pushing up
On plate 7, then, triangular pyramid fixture 4 is inserted into prefabricated trigone taper hole 3, the face BCD of triangular pyramid fixture 4 keep it is vertical and close to
The vertical plane of trigone taper hole 3, the face ABC of triangular pyramid fixture 4 are parallel to the upper surface of concrete sample 2, as shown in Figure 7.
Step 3: four side surface upper part right positions in concrete sample 2 fix an iron plate 6 respectively, tried in concrete
Four side surface upper part leftward positions of part 2 fix a displacement sensor 5 respectively, four displacement sensors 5 respectively with respective opposite side
Iron plate 6 is opposite one by one, that is, constitutes four pairs of measuring devices.
Step 4: starting press machine, by press machine top board 8, press machine lower platen 7 and triangular pyramid fixture 4 to mixed
Solidifying soil test specimen 2 is slowly further applied load, as shown in fig. 6, the displacement data of acquisition per second of displacement sensor 5, resolution ratio are
0.001mm, press machine loading speed are 20-50N/S.When any one in four displacement sensors 5 measure relative to correspondence
When the displacement of iron plate 6 reaches preset displacement, stop being further applied load.
Step 5: closing press machine, removes band and split concrete sample.
Embodiment two (induction monolete)
Referring to fig. 4, which is basically the same as the first embodiment, and difference is, in step 1, plane where steel wire group with
The side of concrete sample 2 intersects.
Embodiment three (induction multiple cracking)
The difference of the embodiment and above-mentioned two embodiment is, in step 1, sets multiple steel in the concrete sample 2 that pours
Silk group, and the triangular pyramid fixture 4 equal with steel wire group quantity is inserted into the upper surface of concrete sample 2, precast multiple trigones
Perpendicular where the corresponding steel wire group of face is distinguished at taper hole 3, the respective tip of multiple trigone taper holes 3.It can between multiple steel wire groups
Keeping parallelism can also intersect, referring to Fig. 5.Then, triangular pyramid fixture 4 is placed one by one in each trigone taper hole 3, and recycle
Step 2 is executed to four (i.e. primary only to load to a trigone taper hole), gradually multiple cracking is induced to generate.
The above is only the preferred embodiment of the present invention, protection scope of the present invention is not limited merely to above-described embodiment,
All technical solutions belonged under thinking of the present invention all belong to the scope of protection of the present invention.It should be pointed out that for the art
For those of ordinary skill, several improvements and modifications without departing from the principles of the present invention should be regarded as protection of the invention
Range.
Claims (7)
1. a kind of triangular pyramid fixture for being used to prepare band and splitting concrete sample, which is characterized in that the triangular pyramid fixture (4) include A,
B, tetra- vertex C and D, the range of ∠ ABD=∠ ACD=90 °, △ ACD=△ ABD, ∠ BAC are 5 ° to 15 °, the model of ∠ BAD
Enclose is 10 ° to 25 °.
2. the preparation method that a kind of band splits concrete sample, which comprises the steps of:
Step 1: pouring standard concrete test specimen (2), in casting process, several and concrete is successively uniformly placed from bottom to top
The parallel steel wire (1) in test specimen (2) bottom surface, more steel wires (1) are distributed on same vertical plane, constitute a vertical steel wire group；
Meanwhile being inserted into the upper surface of concrete sample (2) straight down by triangular pyramid fixture (4) described in claim 1, it precasts
Trigone taper hole (3), in insertion process, downward, the face ABC is perpendicular to concrete sample (2) upper end on the vertex A of triangular pyramid fixture (4)
Face, and with vertical plane keeping parallelism where the steel wire group, steel wire group institute described in the tip face of the trigone taper hole (3) precast
In vertical plane；It after concrete sample (2) final set, takes out triangular pyramid fixture (4), conserves 28d；
Step 2: concrete sample (2) upper end after forming and conserve in step 1 is placed on press machine lower platen up
(7) on, then, triangular pyramid fixture (4) are inserted into prefabricated trigone taper hole (3), the face BCD of triangular pyramid fixture (4) keeps vertical
And the vertical plane close to trigone taper hole (3), the face ABC of triangular pyramid fixture (4) are parallel to the upper surface of concrete sample (2)；
Step 3: four side surface upper part right positions in concrete sample (2) fix an iron plate (6) respectively, tried in concrete
Four side surface upper part leftward positions of part (2) are fixed a displacement sensor (5) respectively, and four displacement sensors (5) are respectively and respectively
The iron plate (6) of opposite side is opposite one by one；
Step 4: starting press machine, right by press machine top board (8), press machine lower platen (7) and triangular pyramid fixture (4)
Concrete sample (2) is slowly further applied load, when any one in four displacement sensors (5) measure relative to corresponding iron plate
(6) when displacement reaches preset displacement, stop being further applied load；
Step 5: closing press machine, removes band and split concrete sample.
3. the preparation method that band according to claim 2 splits concrete sample, which is characterized in that in step 1, pour
Multiple steel wire groups are set in concrete sample (2), and are inserted into three equal with steel wire group quantity in the upper surface of concrete sample (2)
Pyramid fixture (4), precasts multiple trigone taper holes (3), and the multiple respective tip difference face of trigone taper hole (3) is corresponding
Vertical plane where steel wire group；
Then, triangular pyramid fixture (4) are placed one by one in each trigone taper hole (3), and recycle and execute step 2 to four, gradually induce
Multiple cracking generates.
4. the preparation method that band according to claim 2 or 3 splits concrete sample, which is characterized in that in step 1, trigone
The depth for boring fixture (4) insertion concrete sample (2) is the 1/2 to 3/4 of its height, and triangular pyramid fixture (4) is away from concrete sample
(2) distance of lateral edge is not less than 5mm.
5. the preparation method that band according to claim 4 splits concrete sample, which is characterized in that in step 1, steel wire (1)
Diameter be 0.5~1mm, length be not less than test specimen (2) side length 1/2, with group steel wire (1) between spacing be 10-30mm.
6. the preparation method that band according to claim 4 splits concrete sample, which is characterized in that in step 4, displacement is passed
Sensor (5) displacement data of acquisition per second, resolution ratio 0.001mm.
7. the preparation method that band according to claim 4 splits concrete sample, which is characterized in that in step 4, press machine
Loading speed is 20-50N/S.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910707203.7A CN110426256A (en) | 2019-08-01 | 2019-08-01 | A kind of triangular pyramid fixture and preparation method for being used to prepare band and splitting concrete sample |
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| CN201910707203.7A CN110426256A (en) | 2019-08-01 | 2019-08-01 | A kind of triangular pyramid fixture and preparation method for being used to prepare band and splitting concrete sample |
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| CN110426256A true CN110426256A (en) | 2019-11-08 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112267344A (en) * | 2020-10-16 | 2021-01-26 | 长沙理工大学 | Crack-inducing member and crack-inducing structure |
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| JPH07134084A (en) * | 1993-11-11 | 1995-05-23 | Koji Otsuka | Concrete cracking detection method and x-ray contrast agent used for its method |
| JP2003185562A (en) * | 2001-12-13 | 2003-07-03 | Kyoee:Kk | Concrete-surface inspection method and repair method |
| CN101825531A (en) * | 2010-02-05 | 2010-09-08 | 江苏省建筑科学研究院有限公司 | Control method for inducing concrete crack |
| CN105004611A (en) * | 2015-05-06 | 2015-10-28 | 河海大学 | Method for studying material mechanics behaviors of concrete crack process zone |
| CN204740162U (en) * | 2015-05-14 | 2015-11-04 | 中国建材检验认证集团股份有限公司 | Concrete sample crack produces device |
| CN107402152A (en) * | 2017-08-02 | 2017-11-28 | 深圳大学 | For the method in pre-cast concrete base test specimen crack, prefabricated test specimen and prefabrication system |
| CN108828198A (en) * | 2018-06-12 | 2018-11-16 | 北京工业大学 | Early concrete crack-induced test device |
-
2019
- 2019-08-01 CN CN201910707203.7A patent/CN110426256A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07134084A (en) * | 1993-11-11 | 1995-05-23 | Koji Otsuka | Concrete cracking detection method and x-ray contrast agent used for its method |
| JP2003185562A (en) * | 2001-12-13 | 2003-07-03 | Kyoee:Kk | Concrete-surface inspection method and repair method |
| CN101825531A (en) * | 2010-02-05 | 2010-09-08 | 江苏省建筑科学研究院有限公司 | Control method for inducing concrete crack |
| CN105004611A (en) * | 2015-05-06 | 2015-10-28 | 河海大学 | Method for studying material mechanics behaviors of concrete crack process zone |
| CN204740162U (en) * | 2015-05-14 | 2015-11-04 | 中国建材检验认证集团股份有限公司 | Concrete sample crack produces device |
| CN107402152A (en) * | 2017-08-02 | 2017-11-28 | 深圳大学 | For the method in pre-cast concrete base test specimen crack, prefabricated test specimen and prefabrication system |
| CN108828198A (en) * | 2018-06-12 | 2018-11-16 | 北京工业大学 | Early concrete crack-induced test device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112267344A (en) * | 2020-10-16 | 2021-01-26 | 长沙理工大学 | Crack-inducing member and crack-inducing structure |
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Application publication date: 20191108 |