CN208239191U - Aid device for reinforcing bar and concrete sample pull-out test - Google Patents
Aid device for reinforcing bar and concrete sample pull-out test Download PDFInfo
- Publication number
- CN208239191U CN208239191U CN201820336107.7U CN201820336107U CN208239191U CN 208239191 U CN208239191 U CN 208239191U CN 201820336107 U CN201820336107 U CN 201820336107U CN 208239191 U CN208239191 U CN 208239191U
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- Prior art keywords
- plate
- top plate
- reinforcing bar
- concrete
- out test
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Abstract
The utility model discloses a kind of aid devices for reinforcing bar and concrete sample pull-out test, it includes bottom plate, top plate, locking plate and elastic plate, its insole board is located at the top of the device, it is provided with narrow slit from front to back on top plate, the region of narrow slit is provided with dovetail groove in the downside of top plate, which covers the slotted zone of top plate；Perforation is arranged for bottom plate to be fixedly connected with top plate in pulling plug component in the elastic plate.In the present apparatus, it is non-rigid contact between concrete test block and top plate, contact site between concrete test block and top plate can be buffered, so that effective power all generates between reinforcing bar and test block, avoid the concrete slight crack generated due to the rigidity compressing between top plate and concrete test block.
Description
Technical field
The utility model is related to a kind of auxiliary device suitable for steel-concrete center pull-out test, specifically
A kind of device for adhesion strength between auxiliary clamping and measurement reinforcing bar and concrete belongs to material mechanical performance test equipment neck
Domain.
Background technique
In reinforcing bar and concrete sample, reinforcing bar is with the bond-slip properties (anti-pulling ability) at concrete joint surface
Concrete basic mechanical performance.Not only theoretically there is important meaning to the research of the bond-slip problem of reinforcing bar and concrete
Justice, it is also extremely important in engineering practice, for example, in the reinforced concrete structure being widely present in building and bridge construction,
Anchorage length, the lap of splice, rebar surface roughness, surface oxidation degree etc. of the reinforcing bar in concrete, all can to reinforcing bar with
The bond strength of concrete impacts.In addition, the formulated component of concrete also has larger impact to the bond strength of the two, separately
Outside, it is also necessary to comprehensively consider the extraneous construction factor such as construction weather and therefore in practical projects, need to the reinforcing bar in engineering
Anti-pull-out property between concrete sample is detected and is tested.
In Practical Project, Reinforcing Steel Bar In Reinforced Concrete Structure and the stress and failure mechanism at concrete binding position are non-
It is often complicated, it is difficult accurate simulation, the test method measurement of center drawing is generallyd use in laboratory.
Drawing experimental procedure is as follows:
The first step
After general bar planting 72 hours, tensiometer (jack) can be used, pull-out test load is carried out to planted reinforcing bar.Drawing
In the process, it at the uniform velocity loads 2 minutes to 3 minutes (or using hierarchical loading), until destroying.
Second step
Analysis destroys as a result, common, and failure mode is divided into reinforcing bar and destroys (reinforcing bar is broken), glue muscle section destruction (reinforcing bar
Along structure glue, reinforcing bar interface extract), mixing destroy (top concrete conical failure, lower part are pulled out along structure glue, concrete interface
3 kinds out), structural elements bar planting, failure mode is preferably controlled and is broken for reinforcing bar.
In this experiment, test specimen is fixed usually using fixation clip, structural reference Fig. 1 and patent document CN
Content disclosed in 203798715U (a kind of auxiliary device for pull rod concrete test block pull-out test), wherein in the dress
In setting, it is made of upper steel plate (1), lower steel plate (3), pull rod (8) and four cylinders；Upper steel plate and lower steel plate are square plate；Four
A column vertical is fixed between upper steel plate and lower steel plate；The bottom of lower steel plate be fixed with one perpendicular to lower steel plate and for
The connected pull rod (8) of testing machine；The center of upper steel plate is equipped with a circular hole (7) for the drawing reinforcing bar across test specimen；It is described
Upper cover plate be also provided with one for circular hole described in connection and the slot (6) outside upper steel plate；The width of slot is less than the circular hole
Diameter.That is, upper steel plate is that test specimen is fixed on press machine by way of compression.
There are the problem of 1: test specimen is fixed between upper and lower steel plate, and there are deflecting forces on the vertical direction of reinforcing bar, partially
The presence for turning power influences the data accuracy of drawing experiment.
There are the problem of 2, test specimen be fixed between upper and lower steel plate, during drawing, concrete and upper steel plate it
Between there are rigid contacts, be easy to produce on concrete due to squeezing the slight crack generated, this slight crack has a direct impact drawing
Pull out experimental result.
Utility model content
In order to solve the deficiencies in the prior art, the utility model provides one kind for reinforcing bar and concrete sample pull-out test
Aid device, for solve drawing experiment in accommodate it is unreasonable caused by experiment problem.
The utility model solves technical solution used by its technical problem are as follows:
Aid device for reinforcing bar and concrete sample pull-out test, it is characterised in that: including
Top plate is provided with narrow slit from front to back positioned at the top of the device on top plate, in the downside of top plate close to narrow
The region of seam is provided with dovetail groove, which covers the slotted zone of top plate；
Bottom plate, positioned at the bottom of the device,
Pulling plug component for bottom plate to be fixedly connected with top plate, and forms concrete test block between top plate and bottom plate
Accommodation space,
Locking plate,
And elastic plate, perforation is set in the elastic plate.
The elastic plate is one of rubber slab, nylon sheet or polyfluortetraethylene plate.
The thickness of the locking plate is equal to the depth of dovetail groove, and the two sides of locking plate are provided with dovetail configuration.
The protrusion with narrow slit cooperation is provided in the middle part of the locking plate.
The top of the protrusion is provided with operation portion.
The beneficial effects of the utility model are:
It is non-rigid contact in the present apparatus, between concrete test block and top plate, it can be between concrete test block and top plate
Contact site buffered so that effective power all generates between reinforcing bar and test block, avoid due to top plate and concrete examination
The concrete slight crack that rigidity compressing between block generates.
In the present apparatus, the clamping of test specimen can be quickly realized, while by the use of locking plate, it can be to narrow slit position
Intensity enhanced, prevent top plate narrow slit position generate excessive deformation.
Detailed description of the invention
Fig. 1 is the perspective view (assembling process) of the present apparatus.
Fig. 2 is the perspective view of the present apparatus.
Fig. 3 is the top view of Fig. 2.
Fig. 4 is the main view of Fig. 2.
Fig. 5 is A--A cross-section diagram in Fig. 3.
Fig. 6 is B--B cross-section diagram in Fig. 3.
Fig. 7 is drawing experimentation figure.
In figure: 10 bottom plates, 20 top plates, 21 narrow slits, 22 dovetail grooves, 30 pulling plug components, 40 locking plates, 41 dovetail configurations, 42
Protrusion, 43 operation portions, 50 elastic plates, 60 concrete test blocks, 70 accommodation spaces.
Specific embodiment
Referring to figs. 1 to Fig. 7, in the present embodiment, which includes bottom plate 10, top plate 20, pulling plug component 30, locking plate
40 and elastic plate 50, wherein elastic plate 50 can may be the nylon sheet of low elasticity, polytetrafluoro using elastomeric rubber slab
Vinyl plate etc. is provided with one in the centre of elastic plate 50 and holds the perforation that reinforcing bar passes through.
Concrete test block is acted on, square block of the concrete test block by bottom and the reinforcing bar through square block form
's.
Bottom plate 10 and top plate 20 are made of thick steel plate, are drilled in the soleplate, ten groups of pulling plug components 30 pass through from bottom to top
Bottom plate and top plate, and make that top plate is secured with nuts, and ten groups of pulling plug components 30 occupy left and right side and rear side, it forms three faces and contains,
The accommodation space 70 of concrete test block 60 is formed between top plate and bottom plate.Narrow slit from front to back is provided on top plate 20
21, and the width of narrow slit 21 is greater than the diameter of reinforcing bar.For convenience of description, to all around orientation is determined up and down in Fig. 2
Justice.The region of narrow slit is provided with a dovetail groove 22 in the downside of top plate 20, which covers the narrow slit area of top plate
Domain.
Fixed structure matched with testing machine is provided on the bottom plate of the present embodiment, for example, this bottom plate can be tested
Clamp system on machine worktable is clamped.
Locking plate 40 is plate, and thickness is equal to the depth of dovetail groove, the two sides of locking plate are provided with dovetail configuration 41,
So-called dovetail configuration 41 refers to inclined-plane, that is to say, that it is provided with wedge-like engagement at 40 two sides of locking plate and dovetail groove cooperation,
So that being locked up after locking plate insertion dovetail groove.The middle part of locking plate 40 is provided with the protrusion 42 with narrow slit cooperation, the protrusion
Narrow slit is filled from bottom to top, and top is exposed, the top of protrusion is provided with operation portion 43, can be convenient using tools such as drill rods
Locking plate is taken out.
Under application method enters:
The length for adjusting pulling plug component first, forms enough accommodation spaces 70, usual concrete test block is by lower part
What cube block portion and perforative reinforcing bar formed, elastic cushion is worn from top to bottom in reinforcing bar portion, and elastic cushion is used to try in concrete
Buffer layer is formed between block and top plate.Then reinforcing bar is pushed to the central area of accommodation space 70 from the narrow slit position of top plate,
Then narrow slit and 22 position of dovetail groove are blocked using locking plate, after closure, whole device can be put into drawing examination
Test progress drawing experiment on the workbench of machine.During drawing, the top of concrete test block is produced by elastic cushion and top plate
Raw contact can be born uniform power to avoid concrete, be avoided due to concrete upper surface flatness due to the presence of elastic cushion
Cracking phenomena caused by not high.Meanwhile the presence of locking plate, the strength and stiffness at top plate narrow slit position can be promoted,
The rigidity of lifting device entirety.
Embodiment described above is only that preferred embodiments of the present invention are described, not practical to this
Novel range is defined, and under the premise of not departing from the spirit of the design of the utility model, relevant technical staff in the field is to this
The various changes and improvements of utility model should all expand in the protection scope as determined by the utility model claims book.
Claims (5)
1. being used for the aid device of reinforcing bar and concrete sample pull-out test, it is characterised in that: including
Top plate is provided with narrow slit from front to back positioned at the top of the device on top plate, in the downside of top plate close to narrow slit
Region is provided with dovetail groove, which covers the slotted zone of top plate；
Bottom plate, positioned at the bottom of the device,
Pulling plug component, for bottom plate to be fixedly connected with top plate, and between top plate and bottom plate formed concrete test block receiving
Space,
Locking plate,
And elastic plate, perforation is set in the elastic plate.
2. the aid device according to claim 1 for reinforcing bar and concrete sample pull-out test, which is characterized in that institute
Stating elastic plate is one of rubber slab, nylon sheet or polyfluortetraethylene plate.
3. the aid device according to claim 2 for reinforcing bar and concrete sample pull-out test, which is characterized in that institute
The thickness for stating locking plate is equal to the depth of dovetail groove, and the two sides of locking plate are provided with dovetail configuration.
4. the aid device according to claim 3 for reinforcing bar and concrete sample pull-out test, which is characterized in that institute
State the protrusion being provided in the middle part of locking plate with narrow slit cooperation.
5. the aid device according to claim 4 for reinforcing bar and concrete sample pull-out test, which is characterized in that institute
The top for stating protrusion is provided with operation portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820336107.7U CN208239191U (en) | 2018-03-12 | 2018-03-12 | Aid device for reinforcing bar and concrete sample pull-out test |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820336107.7U CN208239191U (en) | 2018-03-12 | 2018-03-12 | Aid device for reinforcing bar and concrete sample pull-out test |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208239191U true CN208239191U (en) | 2018-12-14 |
Family
ID=64588042
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820336107.7U Expired - Fee Related CN208239191U (en) | 2018-03-12 | 2018-03-12 | Aid device for reinforcing bar and concrete sample pull-out test |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208239191U (en) |
-
2018
- 2018-03-12 CN CN201820336107.7U patent/CN208239191U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20181214 Termination date: 20200312 |