CN221124266U - Reinforced concrete bonding slip performance drawing test device - Google Patents
Reinforced concrete bonding slip performance drawing test device Download PDFInfo
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- CN221124266U CN221124266U CN202323112707.5U CN202323112707U CN221124266U CN 221124266 U CN221124266 U CN 221124266U CN 202323112707 U CN202323112707 U CN 202323112707U CN 221124266 U CN221124266 U CN 221124266U
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- 238000012360 testing method Methods 0.000 title claims abstract description 63
- 239000011150 reinforced concrete Substances 0.000 title claims abstract description 30
- 239000004567 concrete Substances 0.000 claims abstract description 51
- 230000000903 blocking effect Effects 0.000 claims abstract description 41
- 229910000831 Steel Inorganic materials 0.000 claims description 24
- 239000010959 steel Substances 0.000 claims description 24
- 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 description 12
- 238000007586 pull-out test Methods 0.000 claims description 5
- 230000005540 biological transmission Effects 0.000 abstract description 7
- 238000006073 displacement reaction Methods 0.000 description 17
- 230000003014 reinforcing effect Effects 0.000 description 8
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- 239000011148 porous material Substances 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
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- 239000004574 high-performance concrete Substances 0.000 description 1
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- 230000007774 longterm Effects 0.000 description 1
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- 230000004044 response Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The utility model relates to a reinforced concrete bonding slip performance drawing test device, which comprises a force transmission clamp, wherein the force transmission clamp comprises a left vertical plate and a right vertical plate, the upper end of the left vertical plate is turned right to form an upper side blocking edge of the left vertical plate, and the lower end of the left vertical plate is turned right to form a lower side blocking edge of the left vertical plate; the upper end of the right vertical plate is turned left to form a right vertical plate upper side blocking edge, the lower end of the right vertical plate is turned left to form a right vertical plate lower side blocking edge in limit fit with the right side edge of the lower end of the concrete test block, the left vertical plate upper side blocking edge and the right vertical plate upper side blocking edge are arranged at intervals, and the upper ends of the left vertical plate upper side blocking edge and the right vertical plate upper side blocking edge are in contact fit with the upper cross beam; the left side riser downside keeps off along, right side riser downside keeps off along the interval setting, and left side riser downside keeps off along, right side riser downside keeps off along the lower extreme and the contact cooperation of crossbeam down. The utility model provides a reinforced concrete bonding slip performance drawing test device capable of preventing concrete around the surface of a reinforced concrete from being pressed by an upper beam.
Description
Technical Field
The utility model relates to the field of research on bonding slip performance of reinforced concrete, in particular to a drawing test device for bonding slip performance of reinforced concrete.
Background
The reinforced concrete and the concrete are often arranged in a concrete building as a whole structure, and the bonding effect of the reinforced concrete and the concrete is the interaction within a certain influence range of the reinforced concrete and the concrete, and is one of the preconditions of the combined work of the two materials, and is one of factors which play an important role in the bearing capacity, the rigidity and the crack control of the reinforced concrete member. Degradation and failure of the bond necessarily results in a decrease and destruction of the mechanical properties of the reinforced concrete structure. With the development and application of novel building structural forms (large-span structures and special structures) and novel building materials (high-performance concrete and high-strength steel bars), the research on bonding and sliding between the steel bars and the concrete is more important.
The binding slip performance of reinforced steel bars and concrete is a long-term research subject, and researchers mainly study the influence of different factors on the binding slip performance through means of model tests, finite element analysis and the like. The conventional bonding slip test method is a traditional center drawing test, steel bars and concrete are poured into standard cube/prism test pieces, the standard cube/prism test pieces are fixed to a universal servo tester, and unidirectional center drawing loading is carried out on the steel bars.
The specific drawing form is shown in fig. 1: including pedestal 1, be provided with stand 8 on the pedestal 1, be provided with entablature 4 and the entablature 2 that upper and lower interval set up on the stand 8, still including being used for carrying out the equipment of pulling that pulls to the reinforcing bar upper end, the equipment of pulling is hydraulic cylinder 7 generally, and the power take off end of hydraulic cylinder is provided with and pulls the crossbeam.
When the device is used, the concrete test block 3 of the reinforced concrete member is placed between the upper beam and the lower beam, wherein the upper end face of the concrete test block is contacted with the bottom of the upper beam, the lower end face of the concrete test block is contacted with the upper end of the lower beam, the anchorage device 6 is connected to the upper end of the steel bar 5 of the reinforced concrete member, and the pulling beam pulls the steel bar through the anchorage device and is connected with the corresponding displacement meter. In the process of applying and pulling the steel bars by the applying and pulling equipment, the concrete test block is limited by the upper beam, and the displacement of the steel bars relative to the concrete test block can be measured by the displacement meter, so that the bonding sliding performance between the steel bars and the concrete test block is obtained.
However, the conventional such a pull-out test apparatus has the following problems: as shown in FIG. 2, because the whole upper end of the concrete test block is in contact with the upper beam, when the steel bar is in a tensile state, the whole upper end of the concrete test block is in a compressed state under the action of the upper beam, and compression struts are formed between the supporting points of the concrete test block and the surface of the steel bar, so that the surface of the steel bar is compressed, the stress field of the test sample does not conform to the actual construction stress condition, and in the actual construction stress environment, the peripheral concrete test block of the steel bar does not apply pressure to the steel bar when the steel bar is in tension. Therefore, the traditional test method not only affects the measured bonding strength, but also affects the bonding response mechanism, so that the test results of different scholars are greatly different, and even the test results of the same group of tests are greatly different. F in fig. 2 represents the tension applied to the steel bar; f represents the pressure of the concrete test block on the upper cross beam.
Disclosure of utility model
The utility model aims to provide a reinforced concrete bonding slip performance drawing test device which can prevent concrete around the surface of a reinforced bar from being pressed by an upper beam when a drawing test is carried out on the reinforced bar.
In order to solve the technical problems, the technical scheme of the reinforced concrete bonding slip performance drawing test device is as follows:
The device comprises a pedestal, a pulling device, a force transmission clamp, a left vertical plate and a right vertical plate, wherein the pulling device is arranged on the upper side of the pedestal and used for pulling the upper end of a steel bar, an upright post is arranged on the pedestal, an upper cross beam and a lower cross beam are arranged on the upright post at intervals, the force transmission clamp comprises the left vertical plate and the right vertical plate which are positioned on the left side and the right side of a concrete test block, the upper end of the left vertical plate turns right to form a left vertical plate upper side blocking edge which is in limit fit with the left side of the upper end of the concrete test block, and the lower end of the left vertical plate turns right to form a left vertical plate lower side blocking edge which is in limit fit with the left side of the lower end of the concrete test block; the upper end of the right vertical plate is turned left to form a right vertical plate upper side blocking edge in limit fit with the right side edge of the upper end of the concrete test block, the lower end of the right vertical plate is turned left to form a right vertical plate lower side blocking edge in limit fit with the right side edge of the lower end of the concrete test block, the left vertical plate upper side blocking edge and the right vertical plate upper side blocking edge are arranged at intervals, and the upper ends of the left vertical plate upper side blocking edge and the right vertical plate upper side blocking edge are in contact fit with the upper cross beam; the left side riser downside keeps off along, right side riser downside keeps off along the interval setting, and left side riser downside keeps off along, right side riser downside keeps off along the lower extreme and the contact cooperation of crossbeam down.
Further, the upper side blocking edge of the left vertical plate and the lower side blocking edge of the left vertical plate are arranged vertically to the left vertical plate; the upper baffle edge of the right vertical plate and the lower baffle edge of the right vertical plate are perpendicular to the right vertical plate.
Further, the left vertical plate comprises a first left vertical plate and a second left vertical plate which are in telescopic fit along the up-down direction, the upper side blocking edge of the left vertical plate is arranged at the upper end of the first left vertical plate, and the lower side blocking edge of the left vertical plate is arranged at the lower end of the first left vertical plate; the right side riser package is along flexible complex first right side riser and the second right side riser from top to bottom, and right side riser upside keeps off along setting up in the upper end of first right side riser, and right side riser downside keeps off along setting up in the lower extreme of second right side riser.
Further, the upper end of the second left vertical plate is provided with a left vertical plate jack, the lower end of the first left vertical plate is prevented from rotating and guiding and is inserted into the left vertical plate jack, a plurality of first left vertical plate pin shaft holes which are arranged along the vertical direction at intervals are arranged on the first left vertical plate, a left vertical plate jack pin shaft hole which is correspondingly arranged with the first left vertical plate pin shaft hole is arranged on the hole wall of the left vertical plate jack, and a left height positioning pin shaft is inserted into the left vertical plate jack pin shaft hole and the corresponding first left vertical plate pin shaft hole.
Further, the second right side riser upper end is provided with right side riser jack, and the lower extreme of first right side riser ends to change direction cartridge in right side riser jack, is provided with a plurality of first right side riser pin shaft holes that follow upper and lower direction interval and set up on the first right side riser, is provided with the right side riser jack pin shaft hole that corresponds the setting with first right side riser pin shaft hole on the pore wall of right side riser jack, cartridge has right side height positioning pin axle in right side riser jack pin shaft hole and the first right side riser pin shaft hole that corresponds.
The beneficial effects of the utility model are as follows: when the utility model is used, the left vertical plate is arranged on the left side of the concrete test block, the right vertical plate is arranged on the right side of the concrete test block, the upper side blocking edge of the left vertical plate is in limit fit with the left side edge of the upper end of the concrete test block, and the lower side blocking edge of the left vertical plate is in limit fit with the left side edge of the lower end of the concrete test block; the right side riser upper side keeps off along with the spacing cooperation of concrete test block upper end right side limit, right side riser downside keeps off along with the spacing cooperation of concrete test block lower extreme right side limit, place biography power anchor clamps and concrete test block between entablature and entablature, the top that left side riser upside kept off along, right side riser upside kept off along contacts with entablature, the bottom that left side riser downside kept off along, right side riser downside kept off along contacts with the entablature, the equipment of pulling is when upwards pulling to the reinforcing bar, the effort of entablature is passed through left side riser upside and right side riser upside keeps off along and is kept off along and transmit for the concrete test block, this effort only transmits the left and right edge position of concrete test block, can not reach around the reinforcing bar surface, avoid forming the spliced pole at the reinforcing bar surface periphery and influence the bonding strength between reinforcing bar and the concrete test block.
Drawings
The above, as well as additional purposes, features, and advantages of exemplary embodiments of the present disclosure will become readily apparent from the following detailed description when read in conjunction with the accompanying drawings. Several embodiments of the present disclosure are illustrated by way of example, and not by way of limitation, in the figures of the accompanying drawings and in which like reference numerals refer to like or corresponding parts and in which:
FIG. 1 is a schematic diagram of a prior art reinforced concrete bond slip test apparatus;
FIG. 2 is a schematic diagram of the force exerted by a concrete test block on the surface of the steel bar against the steel bar as the steel bar in FIG. 1 is pulled;
FIG. 3 is a schematic view of an embodiment of a reinforced concrete bond slip test apparatus according to the present utility model;
FIG. 4 is a schematic illustration of the engagement of the force transmitting clamp of FIG. 3 with a concrete block;
FIG. 5 is a schematic view of the structure of the left riser of FIG. 4;
FIG. 6 is a side view of the left riser of FIG. 4;
Reference numerals illustrate: 1. a pedestal; 2. a lower cross beam; 3. a concrete test block; 4. an upper cross beam; 5. reinforcing steel bars; 6. an anchor; 7. a hydraulic cylinder; 8. a column; 9. a left side displacement meter; 10. a right side displacement meter; 11. a displacement beam; 12. a force transmission clamp; 13. a left riser; 14. a right riser; 15. a first left riser; 16. a second left riser; 17. left riser insertion holes; 18. the upper side blocking edge of the left vertical plate; 19. the lower side baffle edge of the left vertical plate; 20. a first right riser; 21. a second right riser; 22. a right riser receptacle; 23. the upper side blocking edge of the right vertical plate; 24. the lower baffle edge of the right vertical plate; 25. a first left vertical plate pin shaft hole; 26. the left vertical plate jack pin shaft hole.
Detailed Description
In order that the utility model may be readily understood, a more particular description thereof will be rendered by reference to specific embodiments that are illustrated in the appended drawings. Preferred embodiments of the present utility model are shown in the drawings. This utility model may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used in the description of the utility model herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model.
The embodiment of the utility model relates to a reinforced concrete bonding slip performance drawing test device, which is shown in figures 3-6:
Including pedestal 1 and the equipment of pulling that is used for pulling to the reinforcing bar upper end that pulls that sets up in the pedestal upside, in this embodiment, the hydraulic cylinder 7 of pulling equipment for vertical setting is provided with four vertical arrangement's stand 8 on the pedestal, is provided with entablature 4 and entablature 2 on the stand 8, and during the use, the action output of hydraulic cylinder 7 links to each other with the ground tackle and applys the pulling force to the reinforcing bar at the upper end fixed ground tackle 6 of reinforcing bar. The above all belong to the prior art.
The improvement of the utility model is that: the reinforced concrete bonding slip performance drawing test device also comprises a force transmission clamp 12, wherein the force transmission clamp comprises a left vertical plate 13 and a right vertical plate 14 which are arranged at the left side and the right side of the concrete test block in use, the upper end of the left vertical plate is turned right to form a left vertical plate upper side blocking edge 18 which is in limit fit with the left side edge of the upper end of the concrete test block, and the lower end of the left vertical plate is turned right to form a left vertical plate lower side blocking edge 19 which is in limit fit with the left side edge of the lower end of the concrete test block; the upper end of the right vertical plate is turned left to form a right vertical plate upper side blocking edge 23 in limit fit with the right side edge of the upper end of the concrete test block, the lower end of the right vertical plate is turned left to form a right vertical plate lower side blocking edge 24 in limit fit with the right side edge of the lower end of the concrete test block, the left vertical plate upper side blocking edge and the right vertical plate upper side blocking edge are arranged at intervals, and the upper ends of the left vertical plate upper side blocking edge 18 and the right vertical plate upper side blocking edge 23 are in contact fit with the upper cross beam 4; the left side riser downside keeps off along 19, right side riser downside keeps off along 24 interval settings, and left side riser downside keeps off along, right side riser downside keeps off along the lower extreme and contacts cooperation with lower beam 2.
In the embodiment, the upper side baffle edge 18 of the left vertical plate and the lower side baffle edge 19 of the left vertical plate are arranged vertically to the left vertical plate; the upper baffle edge 23 of the right vertical plate and the lower baffle edge 24 of the right vertical plate are perpendicular to the right vertical plate.
The left side riser includes first left side riser 15 and the left side riser 16 of second that arrange from top to bottom, and first left side riser and the left side riser of second are flexible to cooperate in the upper and lower direction, and left side riser upside keeps off along setting up in the upper end of first left side riser, and left side riser downside keeps off along setting up in the lower extreme of first left side riser. The right side riser includes first right side riser 20 and the second right side riser 21 of arranging from top to bottom, and first right side riser and second right side riser are along the flexible cooperation of upper and lower direction, and right side riser upside keeps off along setting up in the upper end of first right side riser, and right side riser downside keeps off along setting up in the lower extreme of second right side riser.
Specifically, the upper end of the second left side riser is provided with a left side riser jack 17, the lower extreme of first left side riser ends the direction cartridge in left side riser jack 17, be provided with two on the first left side riser along fore-and-aft direction interval arrangement's first left side riser round pin axle hole group, every first left side riser round pin axle hole group is all a plurality of along the first left side riser round pin axle hole 25 of upper and lower direction interval setting, be provided with on the pore wall of left side riser jack with first left side riser round pin axle hole correspond the left side riser jack round pin axle hole 26 that sets up, cartridge has left side height locating pin axle in left side riser jack round pin axle hole and the first left side riser round pin axle hole that corresponds. In this embodiment, the left riser jack pin shaft hole and the first left riser pin shaft hole are hexagonal holes, and the corresponding left height positioning pin shaft is of a hexagonal prism structure matched with the hexagonal hole.
The second right side riser upper end is provided with right side riser jack 22, and the lower extreme of first right side riser 20 ends to change direction cartridge in right side riser jack 22, is provided with two on the first right side riser and follows the first right side riser round pin axle hole group of fore-and-aft direction interval arrangement, and every first right side riser round pin axle hole group all a plurality of first right side riser round pin axle holes of following the upper and lower direction interval setting. The hole wall of the right vertical plate jack is provided with a right vertical plate jack pin shaft hole which is correspondingly arranged with the first right vertical plate pin shaft hole, and a right height positioning pin shaft is inserted in the right vertical plate jack pin shaft hole and the corresponding first right vertical plate pin shaft hole. In this embodiment, the right riser jack pin shaft hole and the first right riser pin shaft hole are both hexagonal holes, and the corresponding right height positioning pin shaft is in a hexagonal prism structure matched with the hexagonal holes.
When in use, the heights of the left vertical plate and the right vertical plate can be adjusted according to the height of the concrete test block to match with the concrete test block. The reinforced concrete bonding slip test device further comprises a displacement meter for detecting the slip distance between the reinforced concrete blocks relative to the reinforced concrete, wherein the displacement meter comprises a left displacement meter 9 and a right displacement meter 10 which are symmetrically arranged on the left side and the right side of the reinforced concrete, the lower ends of the left displacement meter 9 and the right displacement meter 10 are connected with a displacement cross rod, and the middle part of the displacement cross rod 11 is connected with the reinforced concrete. When the hydraulic cylinder pulls the steel bars, the slippage generated by the steel bars relative to the concrete test block can be displayed by the displacement cross bar and measured by the left side displacement sensor and the right side displacement sensor.
In the foregoing description of the present specification, the terms "fixed," "mounted," "connected," or "connected" are to be construed broadly, unless explicitly stated or limited otherwise. For example, in terms of the term "coupled," it may be fixedly coupled, detachably coupled, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intermediaries, or in communication with each other or in interaction with each other. Therefore, unless otherwise specifically defined in the specification, a person skilled in the art can understand the specific meaning of the above terms in the present utility model according to the specific circumstances.
Those skilled in the art will also appreciate from the foregoing description that terms such as "upper," "lower," "front," "rear," "left," "right," "length," "width," "thickness," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," "circumferential," "center," "longitudinal," "transverse," "clockwise," or "counterclockwise" and the like are used herein for the purpose of facilitating description and simplifying the description of the present utility model, and thus do not necessarily have to have, configure, or operate in, the specific orientations, and thus are not to be construed or construed as limiting the present utility model.
In addition, the terms "first" or "second" and the like used in the present specification to refer to the numbers or ordinal numbers are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present specification, the meaning of "plurality" means at least two, for example, two, three or more, etc., unless explicitly defined otherwise.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and are not limiting; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present utility model.
Claims (5)
1. The utility model provides a reinforced concrete bonding slip performance drawing test device, includes the pedestal and sets up in the pedestal upside be used for to the steel bar upper end pull the equipment of pulling, be provided with the stand on the pedestal, be provided with upper beam and the lower beam of upper and lower interval arrangement on the stand, its characterized in that: the device comprises a concrete test block, a left riser, a right riser, a left riser upper side blocking edge, a left riser lower side blocking edge and a left riser upper side blocking edge, wherein the left riser and the right riser are positioned at the left side and the right side of the concrete test block; the upper end of the right vertical plate is turned left to form a right vertical plate upper side blocking edge in limit fit with the right side edge of the upper end of the concrete test block, the lower end of the right vertical plate is turned left to form a right vertical plate lower side blocking edge in limit fit with the right side edge of the lower end of the concrete test block, the left vertical plate upper side blocking edge and the right vertical plate upper side blocking edge are arranged at intervals, and the upper ends of the left vertical plate upper side blocking edge and the right vertical plate upper side blocking edge are in contact fit with the upper cross beam; the left side riser downside keeps off along, right side riser downside keeps off along the interval setting, and left side riser downside keeps off along, right side riser downside keeps off along the lower extreme and the contact cooperation of crossbeam down.
2. The reinforced concrete bond slip performance pullout test apparatus as claimed in claim 1, wherein: the upper baffle edge of the left vertical plate and the lower baffle edge of the left vertical plate are arranged vertically to the left vertical plate; the upper baffle edge of the right vertical plate and the lower baffle edge of the right vertical plate are perpendicular to the right vertical plate.
3. The reinforced concrete bond slip performance pull-out test apparatus according to claim 1 or 2, wherein: the left vertical plate comprises a first left vertical plate and a second left vertical plate which are in telescopic fit along the up-down direction, the upper side baffle edge of the left vertical plate is arranged at the upper end of the first left vertical plate, and the lower side baffle edge of the left vertical plate is arranged at the lower end of the first left vertical plate; the right side riser package is along flexible complex first right side riser and the second right side riser from top to bottom, and right side riser upside keeps off along setting up in the upper end of first right side riser, and right side riser downside keeps off along setting up in the lower extreme of second right side riser.
4. A reinforced concrete bond slip performance pullout test apparatus as claimed in claim 3, wherein: the upper end of the second left vertical plate is provided with a left vertical plate jack, the lower end rotation stopping guide of the first left vertical plate is inserted into the left vertical plate jack, a plurality of first left vertical plate pin shaft holes which are arranged along the vertical direction at intervals are arranged on the first left vertical plate, a left vertical plate jack pin shaft hole which is correspondingly arranged with the first left vertical plate pin shaft hole is arranged on the hole wall of the left vertical plate jack, and a left height positioning pin shaft is inserted into the left vertical plate jack pin shaft hole and the corresponding first left vertical plate pin shaft hole.
5. A reinforced concrete bond slip performance pullout test apparatus as claimed in claim 3, wherein: the upper end of the second right vertical plate is provided with a right vertical plate jack, the lower end rotation stopping guide of the first right vertical plate is inserted into the right vertical plate jack, a plurality of first right vertical plate pin shaft holes which are arranged along the vertical direction at intervals are arranged on the first right vertical plate, right vertical plate jack pin shaft holes which are correspondingly arranged with the first right vertical plate pin shaft holes are arranged on the hole wall of the right vertical plate jack, and right vertical plate height positioning pins are inserted into the right vertical plate jack pin shaft holes and the corresponding first right vertical plate pin shaft holes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323112707.5U CN221124266U (en) | 2023-11-17 | 2023-11-17 | Reinforced concrete bonding slip performance drawing test device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323112707.5U CN221124266U (en) | 2023-11-17 | 2023-11-17 | Reinforced concrete bonding slip performance drawing test device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN221124266U true CN221124266U (en) | 2024-06-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202323112707.5U Active CN221124266U (en) | 2023-11-17 | 2023-11-17 | Reinforced concrete bonding slip performance drawing test device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN221124266U (en) |
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2023
- 2023-11-17 CN CN202323112707.5U patent/CN221124266U/en active Active
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