CN104614245B - The pulling test device and pulling test method of reinforcing bar grout sleeve overlap joint connection test specimen - Google Patents
The pulling test device and pulling test method of reinforcing bar grout sleeve overlap joint connection test specimen Download PDFInfo
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- CN104614245B CN104614245B CN201510081378.3A CN201510081378A CN104614245B CN 104614245 B CN104614245 B CN 104614245B CN 201510081378 A CN201510081378 A CN 201510081378A CN 104614245 B CN104614245 B CN 104614245B
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- chuck
- locating piece
- reinforcing bar
- test specimen
- templin
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- 238000012360 testing method Methods 0.000 title claims abstract description 74
- 230000003014 reinforcing effect Effects 0.000 title claims abstract description 40
- 239000011440 grout Substances 0.000 title claims abstract description 11
- 238000010998 test method Methods 0.000 title abstract description 7
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 27
- 239000010959 steel Substances 0.000 claims abstract description 27
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims abstract description 14
- 210000003205 muscle Anatomy 0.000 claims description 3
- 230000002787 reinforcement Effects 0.000 claims description 3
- 210000004247 hand Anatomy 0.000 claims 1
- 238000003466 welding Methods 0.000 claims 1
- 238000013461 design Methods 0.000 description 8
- 238000003780 insertion Methods 0.000 description 4
- 230000037431 insertion Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000003556 assay Methods 0.000 description 1
- 238000009435 building construction Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The present invention relates to the pulling test device and pulling test method of a kind of reinforcing bar grout sleeve overlap joint connection test specimen.Including upper fixture component, lower clamp component, positioning component, actuator, pedestal, upper fixture component includes the upper locating piece being connected with actuator, the upper templin chuck of clamping reinforcing bar, templin chuck moves horizontally the upper grip control assembly with folding in control；Lower clamp component includes the lower locating piece being connected with pedestal, the lower templin chuck of clamping reinforcing bar, the lower chuck control assembly for controlling lower templin chuck folding；Positioning component includes fixing steel plate and the floor being welded and fixed with lower locating piece, it is equipped with fixing steel plate and bar splicing connection test specimen is fixed on into the U-bolt on fixing steel plate, the upper and lower overlap joint reinforcing bar of bar splicing connection test specimen is clamped by upper and lower templin chuck respectively.The present invention has a versatility to all kinds of overlap joints connection test specimen, measured test data is accurately, reliable, it is to avoid the drawbacks of other pulling test devices.
Description
Technical field
The present invention relates to steel bar connector test for tensile strength, specifically a kind of reinforcing bar grout sleeve overlap joint connection test specimen
Pulling test device and pulling test method.
Background technology
Rebar connecting technology is widely used in building construction process, and is required to butt joint quality and is carried out quality inspection.
Existing bar splicing connects the pulling test of test specimen, and what experimental apparatus were provided is coaxial pulling force, and such as CN103698213A is public
A kind of tension and compression testing device and pull pressure test method of the bar connecting test specimen opened, the device can only provide coaxial pulling force.It is coaxial
Pulling force can simulate the stress characteristic of overlap joint connection test specimen to a certain extent, approximate to carry out experiment to its mechanical property and grind
Study carefully, but the actual loading of overlap joint connection test specimen is non co axial pulling force, this results in experimental results and deposits compared with practical situation
In certain error, the experimental data for being provided can not provide the design considerationss of science for engineering design.
The content of the invention
Present invention seek to address that the problem that the pulling test device of existing overlap joint connection test specimen is present, there is provided a kind of energy is more preferably
Reflection overlap joint connection test specimen stress characteristic, it is ensured that experimental data it is accurate, reliable, simple structure is easy to operate, takes to all kinds of
Test specimen being connect in succession there is versatility, the reinforcing bar grout sleeve overlap joint for providing scientific design foundation for engineering design connects opening for test specimen
Draw assay device.
The present invention solves the technical scheme of the problem employing：
A kind of pulling test device of reinforcing bar grout sleeve overlap joint connection test specimen, including upper fixture component, lower clamp component,
Positioning component, actuator, pedestal, bar splicing connection test specimen, the upper fixture component include：The upper positioning being connected with actuator
Block, the upper templin chuck of clamping reinforcing bar, in control, templin chuck moves horizontally the upper grip control assembly with folding；It is described fixed
A upper grip wedge that Open Side Down, inserts templin chuck and is oriented to upper templin chuck and is clamped is provided with the block of position
Shape elongated slot；The lower clamp component includes：The lower locating piece being connected with pedestal, the lower templin chuck of clamping reinforcing bar control hyposphene
The lower chuck control assembly of clevis head folding；An opening upwards are provided with the lower locating piece, lower templin chuck is inserted simultaneously
The lower chuck wedge shape elongated slot for lower templin chuck being oriented to and being clamped；The positioning component includes fixing steel plate, the positioning
Steel plate is welded with floor, and fixing steel plate and floor lower end are welded and fixed with lower locating piece, and U-bolt is equipped with fixing steel plate；
The bar splicing connection test specimen is fixed on the fixing steel plate of positioning component by the U-bolt, bar splicing connection examination
The upper reinforcement termination of part is clamped by upper templin chuck, and the lower rebar termination of bar splicing connection test specimen is pressed from both sides by lower templin chuck
Hold.
The pulling test method of the reinforcing bar grout sleeve overlap joint connection test specimen pulling test device, enters in the steps below
OK：
A. the bonding strength requirement of test specimen, design the upper and lower clamp assembly of processing and fabricating and positioning are connected by bar splicing
Shaped steel, steel plate needed for component, bolt, and assemble upper and lower clamp assembly and positioning component；
B. upper and lower clamp assembly is fixed on pedestal and actuator by respective bolt hole；
C. the handle in lower chuck control assembly is lifted upwards, and lower templin chuck is moved down, and jaws is opened, and reinforcing bar is taken
Connect in the jaws of the lower templin chuck of test piece lower part reinforcing bar insertion in succession, release handle is moved on lower templin chuck and clamps test piece lower part
Reinforcing bar；
D. by U-bolt by bar splicing connect specimen holder on the fixing steel plate of positioning component, in blending bolt
Tightly, clamping action is played to test specimen；
E. the pull-up rod bearing in upper grip control assembly is moved, upper templin chuck is moved horizontally to correct position, makes examination
The jaws of the upper templin chuck of part upper reinforcement alignment, downward handle will be moved on upper templin chuck, and jaws is opened, and is moved down
Actuator, in making the jaws of the upper templin chuck of test piece upper part reinforcing bar insertion, release handle, upper templin chuck are moved down on clamping test specimen
Portion's reinforcing bar；
F. move up actuator so as to which a less pulling force is applied to test specimen, it is ensured that upper and lower templin chuck clamps steel
Muscle；
G. the power of actuator is adjusted to dead-center position, moved up by control actuator and bar splicing connection test specimen is applied
Plus pulling force, carry out tension test.
Using the present invention of above-mentioned technical proposal, compared with prior art, the characteristics of its protrusion it is：
More realistically reflect that bar splicing connects the mechanical characteristic of test specimen, it is simple to operate, testing crew technical merit is not had
There is excessive demand, connect measure safety, easy to process, resulting test data is more accurate, reliable, provides for engineering design
The design considerationss of science, it is to avoid the drawbacks of other pulling test devices, have a wide range of applications space and good practical effect
Really.
Preferably, the present invention further technical scheme is：
The upper grip control assembly includes pulling up rod bearing, upper connecting rod, top in the upper grip wedge shape elongated slot of upper locating piece
Portion is provided with dovetail groove, and pull-up rod bearing is slided by the dovetail groove and is lifted in the upper grip wedge shape elongated slot of upper locating piece,
Upper connecting rod is hinged on pull-up rod bearing, and upper connecting rod one end is connected with upper templin chuck by upper articulated joint, the upper connecting rod other end
For handle end, upper connecting rod handle is stretched out outside upper grip wedge shape elongated slot, is connected with tension bullet between upper connecting rod and pull-up rod bearing
Spring.
The lower chuck control assembly includes lower drag link bearing, lower pull bar, and lower drag link bearing is fixed under lower locating piece
Chuck wedge shape elongated slot inner bottom part, lower pull bar are hinged on lower drag link bearing, and lower pull bar one end is by lower articulated joint and lower wedge grip
Head connection, the lower pull bar other end is handle end, and lower pull bar handle stretched out outside lower chuck wedge shape elongated slot, lower pull bar and lower locating piece it
Between be connected with lower back-moving spring.
The upper locating piece is connected with actuator by four bolts hole that top board is arranged, and provides drawing to test piece upper part reinforcing bar
Power.
The lower locating piece is connected with pedestal by four bolts hole that base plate is arranged, and provides drawing to test piece lower part reinforcing bar
Power.
Clamping is respectively arranged with the upper templin chuck, two of the lower templin chuck inner side concave surfaces for stepping up block to take
Connect the sawtooth of reinforcing bar.
The lower templin chuck has the overhanging edge of a wing, matches with the wedge shape elongated slot in lower locating piece.
Description of the drawings
Positive facade structural representations of the Fig. 1 for the embodiment of the present invention；
Side elevation structural representations of the Fig. 2 for the embodiment of the present invention；
Fig. 3 is A-A profiles in Fig. 1；
Fig. 4 is B-B profiles in Fig. 1；
Fig. 5 is C-C profiles in Fig. 1；
Longitudinal sectional drawings of the Fig. 6 for upper grip control assembly；
Longitudinal sectional drawings of the Fig. 7 for lower chuck control assembly；
Fig. 8 is upper templin chuck overlooking structure figure；
Fig. 9 is upper templin chuck front view structure figure；
Figure 10 is that the single of upper templin chuck steps up concave surface expanded view on the inside of block；
Figure 11 is lower templin chuck overlooking structure figure；
Figure 12 is lower templin chuck front view structure figure；
Figure 13 is that the single of lower templin chuck steps up concave surface expanded view on the inside of block.
In figure：Actuator 1, upper locating piece 2, upper grip control assembly 3, upper templin chuck 4, positioning component 5, bar splicing
Connection test specimen 6, lower locating piece 7, lower templin chuck 8, lower chuck control assembly 9, pedestal 10；Upper grip wedge shape elongated slot 21, dovetail
Groove 22；Pull-up rod bearing 31, upper connecting rod 32, upper connecting rod handle 33, upper back-moving spring 34, upper articulated joint 35；On step up block 41, on
The jaws 42 of templin chuck, above steps up concave surface sawtooth 43 on the inside of block；Fixing steel plate 51, floor 52, U-bolt 53；Upper overlap joint steel
Muscle 61, lower overlap joint reinforcing bar 62；Lower chuck wedge shape elongated slot 71；Under step up block 81, the jaws 82 of lower templin chuck, the overhanging edge of a wing 83,
Under step up concave surface sawtooth 84 on the inside of block；Lower drag link bearing 91, lower pull bar 92, lower pull bar handle 93, lower back-moving spring 94, under be hinged
95.
Specific embodiment
The present invention is further elaborated for the embodiment for being given below in conjunction with the accompanying drawings, but embodiment is not constituted to the present invention and appointed
What limits.
Referring to Fig. 1, Fig. 2 and Fig. 5, the pulling test device of the reinforcing bar grout sleeve overlap joint connection test specimen that embodiment is given,
It is made up of actuator 1, positioning component 5, pedestal 10 and upper fixture component and lower clamp component, wherein, upper fixture component includes：With
The upper locating piece 2 of the connection of actuator 1, the upper templin chuck 4 of clamping reinforcing bar, in control, templin chuck 4 is moved horizontally and folding
Upper grip control assembly 3；Lower clamp component includes：The lower locating piece 7 being connected with pedestal 10, the lower templin chuck 8 of clamping reinforcing bar,
The lower chuck control assembly 9 of lower 8 folding of templin chuck of control；Positioning component 5 includes：Fixing steel plate 51, floor 52, U-bolt
53；Fixing steel plate 51 and 52 lower end of floor are welded and fixed with the lower locating piece 7 in lower clamp component, and U-bolt 53 is two secondary, is used
It is fixed on fixing steel plate 51 in bar splicing is connected test specimen 6.
Referring to Fig. 1, Fig. 2, Fig. 3 and Fig. 7, lower locating piece 7 is connected solid by four bolts hole that base plate is arranged with pedestal 10
Fixed, the lower overlap joint reinforcing bar 62 for connecting test specimen 6 to bar splicing provides pulling force；An opening upwards are provided with lower locating piece 7, are put
The lower chuck wedge shape elongated slot 71 for entering lower templin chuck 8 and lower templin chuck 8 being oriented to and is clamped；Lower chuck wedge shape elongated slot 71
Lower chuck control assembly 9 is provided with inside, lower chuck control assembly 9 includes lower drag link bearing 91, lower pull bar 92, lower drag link bearing 91
71 inner bottom part of lower chuck wedge shape elongated slot is fixed on, lower pull bar 92 is hinged on lower drag link bearing 91, under lower 92 one end of pull bar passes through
Articulated joint 95 is connected with lower templin chuck 8, and lower 92 other end of pull bar is handle end, and it is long that lower pull bar handle 93 stretches out lower chuck wedge shape
Outside groove 71, between lower pull bar 92 and lower locating piece 7, lower back-moving spring 94 is connected with.
Referring to Fig. 1, Fig. 2, Fig. 4 and Fig. 6, upper locating piece 2 is connected solid by four bolts hole that top board is arranged with actuator 1
Fixed, the upper overlap joint reinforcing bar 61 for connecting test specimen 6 to bar splicing provides pulling force；It is provided with one on upper locating piece 2 Open Side Down, puts
The upper grip wedge shape elongated slot 21 for entering upper templin chuck 4 and upper templin chuck 4 being oriented to and is clamped；Upper grip wedge shape elongated slot 21
Upper grip control assembly 3 is provided with inside, upper grip control assembly 3 includes pulling up rod bearing 31, upper connecting rod 32, upper locating piece 2
21 inner top of upper grip wedge shape elongated slot is provided with dovetail groove 22, and pull-up rod bearing 31 is slided by the dovetail groove 22 and is lifted on
In chuck wedge shape elongated slot 21, upper connecting rod 32 be hinged on pull-up rod bearing 31 on, 32 one end of upper connecting rod by upper articulated joint 35 with it is upper
Templin chuck 4 connects, and 32 other end of upper connecting rod is handle end, and upper connecting rod handle 33 stretched out outside upper grip wedge shape elongated slot 21, pulls up
Back-moving spring 34 is connected between bar 32 and pull-up rod bearing 31.
Referring to Fig. 8 to Figure 13, on two of upper templin chuck 4, step up the jaws 42 that block 41 forms upper templin chuck, hyposphene
Step up the jaws 82 that block 81 forms lower templin chuck under two of clevis head 8, on the inner side concave surface of the jaws 42 of upper templin chuck
It is provided with and steps up concave surface sawtooth 43 on the inside of block, is provided with down on the inner side concave surface of the jaws 82 of lower templin chuck and steps up on the inside of block
Concave surface sawtooth 84；Stepping up block 81 under two of lower templin chuck 8 has the overhanging edge of a wing, matches with lower chuck wedge shape elongated slot 71.
The pulling test method of bar connecting test specimen 6 is carried out using above-mentioned pulling test device, is carried out in the steps below：
（1）Connect the bonding strength requirement of test specimen 6 by bar splicing, design the simultaneously upper and lower clamp assembly of processing and fabricating and determine
Shaped steel, steel plate needed for hyte part 5, bolt, and assemble upper and lower clamp assembly and positioning component 5.
（2）Upper and lower clamp assembly is fixed on pedestal 10 and actuator 1 by respective bolt hole.
（3）Lower pull bar handle 93 is lifted upwards, and lower templin chuck 8 is moved down, and the jaws 82 of lower templin chuck is opened, will
In the jaws 82 of the lower templin chuck of the lower insertion of overlap joint reinforcing bar 62 of bar splicing connection test specimen 6, lower pull bar handle 93 is unclamped, under
In the presence of back-moving spring 94, move on lower templin chuck 8 and clamp lower overlap joint reinforcing bar 62.
（4）Bar splicing connection test specimen 6 is clamped on the fixing steel plate 51 of positioning component 5 by U-bolt 53, is used in combination
Bolt is tightened, and plays clamping action to bar splicing connection test specimen 6.
（5）Mobile pull-up rod bearing 31, upper templin chuck 4 are moved horizontally to correct position, make bar splicing connect test specimen 6
The upper templin chuck of upper overlap joint reinforcing bar 61 alignment jaws 42, pull down upper connecting rod handle 33, will move on upper templin chuck 4, on
The jaws 42 of templin chuck is opened, and moves down actuator 1, in making the jaws 42 for overlap the upper templin chuck of the insertion of reinforcing bar 61,
Upper connecting rod handle 33 is unclamped, in the presence of upper back-moving spring 34, upper templin chuck 4 is moved down.
（6）Move up actuator 1 so as to a less pulling force is applied to bar splicing connection test specimen 6, it is ensured that upper wedge
Clevis head 4, lower templin chuck 8 clamp overlap joint reinforcing bar 61 and lower overlap joint reinforcing bar 62 respectively.
（7）The power of adjustment actuator 1 is moved up to dead-center position by controlling actuator 1, and bar splicing connection is tried
Part 6 applies pulling force, carries out tension test.
Preferably feasible embodiment of the invention is the foregoing is only, not thereby limits to the interest field of the present invention,
The equivalent structure change made by all utilization description of the invention and accompanying drawing content, is both contained within the interest field of the present invention.
Claims (3)
1. it is a kind of pulling test device of reinforcing bar grout sleeve overlap joint connection test specimen, including upper fixture component, lower clamp component, fixed
Hyte part, actuator, pedestal, bar splicing connection test specimen, it is characterised in that：
The upper fixture component includes：The upper locating piece being connected with actuator, the upper templin chuck of clamping reinforcing bar, wedge shape in control
Chuck moves horizontally the upper grip control assembly with folding；One is provided with the upper locating piece, and Open Side Down, inserts wedge
Clevis head the upper grip wedge shape elongated slot for upper templin chuck being oriented to and being clamped；
The lower clamp component includes：The lower locating piece being connected with pedestal, the lower templin chuck of clamping reinforcing bar, the lower wedge grip of control
The lower chuck control assembly of head folding；An opening upwards are provided with the lower locating piece, lower templin chuck is inserted and under
The lower chuck wedge shape elongated slot that templin chuck is oriented to and is clamped；
The positioning component includes fixing steel plate, and the fixing steel plate is welded with floor, and fixing steel plate and floor lower end are fixed with lower
Position block welding is fixed, and U-bolt is equipped with fixing steel plate；The bar splicing connection test specimen is fixed by the U-bolt
On the fixing steel plate of positioning component, the upper reinforcement termination of bar splicing connection test specimen is clamped by upper templin chuck, and reinforcing bar is taken
The lower rebar termination for connecing test specimen in succession is clamped by lower templin chuck；
The upper grip control assembly includes pulling up rod bearing, upper connecting rod, and the upper grip wedge shape elongated slot inner top of upper locating piece sets
Dovetail groove is equipped with, pull-up rod bearing is slided by the dovetail groove and is lifted in the upper grip wedge shape elongated slot of upper locating piece, is pulled up
Bar is hinged on pull-up rod bearing, and upper connecting rod one end is connected with upper templin chuck by upper articulated joint, and the upper connecting rod other end is handss
Pommel, upper connecting rod handle are stretched out outside upper grip wedge shape elongated slot, are connected with back-moving spring between upper connecting rod and pull-up rod bearing；
The lower chuck control assembly includes lower drag link bearing, lower pull bar, and lower drag link bearing is fixed on the lower chuck of lower locating piece
Wedge shape elongated slot inner bottom part, lower pull bar are hinged on lower drag link bearing, and lower pull bar one end is connected with lower templin chuck by lower articulated joint
Connect, the lower pull bar other end is handle end, and lower pull bar handle stretches out outside lower chuck wedge shape elongated slot, connect between lower pull bar and lower locating piece
It is connected to lower back-moving spring；
Clamping overlap joint steel is respectively arranged with the upper templin chuck, two of the lower templin chuck inner side concave surfaces for stepping up block
The sawtooth of muscle；The lower templin chuck has the overhanging edge of a wing, matches with the wedge shape elongated slot in lower locating piece.
2. reinforcing bar grout sleeve overlap joint according to claim 1 connects the pulling test device of test specimen, it is characterised in that institute
State locating piece to be connected with actuator by four bolts hole that top board is arranged, pulling force is provided to test piece upper part reinforcing bar.
3. reinforcing bar grout sleeve overlap joint according to claim 1 connects the pulling test device of test specimen, it is characterised in that institute
State lower locating piece to be connected with pedestal by four bolts hole that base plate is arranged, pulling force is provided to test piece lower part reinforcing bar.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510081378.3A CN104614245B (en) | 2015-02-15 | 2015-02-15 | The pulling test device and pulling test method of reinforcing bar grout sleeve overlap joint connection test specimen |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510081378.3A CN104614245B (en) | 2015-02-15 | 2015-02-15 | The pulling test device and pulling test method of reinforcing bar grout sleeve overlap joint connection test specimen |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104614245A CN104614245A (en) | 2015-05-13 |
| CN104614245B true CN104614245B (en) | 2017-04-05 |
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| CN201510081378.3A Expired - Fee Related CN104614245B (en) | 2015-02-15 | 2015-02-15 | The pulling test device and pulling test method of reinforcing bar grout sleeve overlap joint connection test specimen |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108548713B (en) * | 2018-03-29 | 2022-10-04 | 合肥工业大学 | Correctable mobile test device and test method thereof |
| CN108387514A (en) * | 2018-05-30 | 2018-08-10 | 金杯电工电磁线有限公司 | The test device and test method of bonding lacquered wires intensity under a kind of condition of high temperature |
| CN109958874B (en) * | 2019-03-25 | 2022-03-25 | 汤始建华建材（南通）有限公司 | Steel pipe sleeve and method for simultaneously measuring strength and strength of prestressed tendon thereof |
| CN114688948B (en) * | 2022-03-03 | 2023-12-29 | 四川高速公路建设开发集团有限公司 | Reinforcing bar connecting sleeve detection device |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3723475C2 (en) * | 1987-07-16 | 1995-11-30 | Schenck Ag Carl | Device for clamping material samples in testing machines |
| US5297441A (en) * | 1992-08-14 | 1994-03-29 | The Boeing Company | Apparatus for supporting a test specimen for compression testing |
| CN200972439Y (en) * | 2006-11-15 | 2007-11-07 | 济南试金集团有限公司 | Wedge lever-type stretch chuck |
| CN201138318Y (en) * | 2007-10-22 | 2008-10-22 | 济南试金集团有限公司 | Multifunctional connecting structure of clamp for test machine |
| CN202631357U (en) * | 2012-06-13 | 2012-12-26 | 宁波康氏塑料科技有限公司 | Plastic tensile property testing machine |
| JP6004113B2 (en) * | 2013-08-07 | 2016-10-05 | 株式会社島津製作所 | Jig mounting device for material testing machine |
| CN103698213B (en) * | 2013-12-29 | 2015-10-14 | 河北联合大学 | The tension and compression testing device of bar connecting test specimen and pull pressure test method |
| CN204389304U (en) * | 2015-02-15 | 2015-06-10 | 河北联合大学 | Reinforcing bar grout sleeve overlap joint connects the pulling test device of test specimen |
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- 2015-02-15 CN CN201510081378.3A patent/CN104614245B/en not_active Expired - Fee Related
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