CN214173967U - Self-balancing constant loading bending creep test device - Google Patents
Self-balancing constant loading bending creep test device Download PDFInfo
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- CN214173967U CN214173967U CN202022930512.1U CN202022930512U CN214173967U CN 214173967 U CN214173967 U CN 214173967U CN 202022930512 U CN202022930512 U CN 202022930512U CN 214173967 U CN214173967 U CN 214173967U
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- 238000012360 testing method Methods 0.000 title claims abstract description 99
- 238000011068 loading method Methods 0.000 title claims abstract description 64
- 238000005452 bending Methods 0.000 title claims description 11
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 39
- 239000010959 steel Substances 0.000 claims abstract description 39
- 230000006835 compression Effects 0.000 claims abstract description 4
- 238000007906 compression Methods 0.000 claims abstract description 4
- 238000010030 laminating Methods 0.000 claims abstract description 3
- 238000000034 method Methods 0.000 abstract description 8
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- 230000007774 longterm Effects 0.000 description 7
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- 230000007547 defect Effects 0.000 description 3
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- 230000004048 modification Effects 0.000 description 2
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- 238000004873 anchoring Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000003203 everyday effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
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Abstract
The utility model relates to a civil engineering technical field discloses a crooked creep test device of invariable loading of self-balancing, simultaneously to two at least concrete test piece loads, establish the support between the test piece, two test piece surfaces in the outside all laminate and are equipped with the load plate that both ends stretch out the test piece edge, two parallel running through in load plate both ends set up two screw-thread steels, a laminating of load plate department sets up to the loaded jack of test piece, first bearing plate is established to the jack other end, another load plate department is the interval and is equipped with the second bearing plate, first bearing plate is run through respectively at the screw-thread steel both ends, the second bearing plate, the elastic component is established to the cover on the screw-thread steel between second bearing plate and the load plate, the elastic component is the compression form all the time. The deformed steel bar, the bearing plate, the jack and the test piece are connected in series integrally, the jack is used for loading the test piece in a centralized manner, the traditional method that a large-scale counterforce wall or a ground anchor needs to be used for a long time is overturned, and the limit of a test field is eliminated; and the loading force of the test piece is kept stable for a long time by automatic load supplement of the high-rigidity elastic component.
Description
Technical Field
The utility model relates to a civil engineering technical field specifically, relates to a crooked creep test device of invariable loading of self-balancing.
Background
The traditional device for testing concrete under the action of long-term load generally applies load to a component by using a lever principle by adopting an earth anchor or a counterforce wall, and the loading method has at least two problems: 1) ground anchors or reaction walls are required and a large loading field is required to facilitate the placement of the loading device; 2) the loading device is only suitable for loading with small load, and when the applied load is large (more than 10 t), the rigidity of the loading device is required to be high, and the loading process is complicated.
At present, a self-balancing loading method for connecting a bearing plate, a jack and a test piece through bolts also exists in the industry, and the loading method still has a serious defect: when the concrete member deforms in the loading process, the load loaded by the jack can be unloaded, but the ideal load test state of the concrete member needs to ensure that the load is constant for a long time, and if the test load needs to be constant for a long time in the loading process by adopting the mode, the force needs to be continuously supplemented, so that time and labor are wasted, and finally, the stability of the load cannot be effectively ensured.
Disclosure of Invention
The utility model provides a technical problem lie in overcoming prior art's defect, provide a crooked creep test device of invariable loading of self-balancing.
The purpose of the utility model is realized through the following technical scheme:
the utility model provides a crooked creep test device of invariable loading of self-balancing, load two at least concrete samples simultaneously, set up the support between the test piece, two test piece surfaces in the outside all laminate and are provided with the load plate that both ends stretch out in the test piece edge, two parallel run-through in load plate both ends set up two screw-thread steels, the laminating of a load plate department sets up the jack that applies load to the test piece, the jack other end is provided with first bearing plate, another load plate department still is the interval and is provided with the second bearing plate, the screw-thread steel both ends run through first bearing plate respectively, the second bearing plate passes through the nut anchor in the department of running through, the cover is equipped with elastomeric element on the screw-thread steel between second bearing plate and the load plate rather than being the interval and setting, elastomeric element is compression state all the time.
Further, the elastic member is a large-rate spring.
Furthermore, the bearing capacity of the elastic component is selected to be 0.6-0.8 times of the load borne by the test piece.
Furthermore, the tensile strength of the deformed steel bar needs to be 3-4 times of the load borne by the test piece.
Furthermore, the loading plate is made of a thickened Q235 steel plate, and the thickness of the loading plate is 18-25 mm.
Furthermore, first bearing plate, second bearing plate all adopt the preparation of thickening Q235 steel sheet, and thickness is 25 ~ 35 mm.
Further, a steel string type pressure sensor is arranged at the connecting position of the first bearing plate and the jack and used for reading a loading value.
Furthermore, a vibrating wire strain gauge is arranged at the maximum strain position of each test piece and used for observing the strain condition.
Furthermore, the side of the test piece facing the deformed steel bar is also provided with a vibrating wire strain gauge for observing strain.
Further, a dial indicator is arranged at the support and used for measuring the deformation of the support, and the dial indicator is arranged at the midpoint of the side face of the test piece, facing the deformed steel bar, and used for measuring the deformation of the test piece.
Compared with the prior art, the utility model discloses following beneficial effect has:
1) the bearing plates and the jacks are connected through the deformed steel bars, so that the test piece and the test device are integrally connected in series, the jack is used for carrying out concentrated loading on the test piece, the traditional method that a large-scale counterforce wall or a ground anchor needs to be used for a long time is overturned, and the limit of a test site is eliminated; automatic load supplement is carried out through the high-rigidity elastic component, so that the test piece is ensured to keep a long-term stable loading force, and the load value born by the test piece does not need to be specially monitored every day;
2) the load is applied to the test pieces respectively to realize the internal balance of the loading test device, and the function that the test device loads at least two concrete test pieces simultaneously greatly improves the test loading efficiency, can obviously reduce the test field, and saves a large amount of manpower, material resources and financial resources.
Drawings
FIG. 1 is a front view of the self-balancing constant load bending creep test apparatus described in example 1;
FIG. 2 is a side view of the self-balancing constant load flexural creep test apparatus described in example 1.
Detailed Description
The invention will be further described with reference to specific embodiments, wherein the drawings are designed solely for the purpose of illustration and not as a definition of the limits of the patent; for a better understanding of the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
Example 1
A self-balancing constant loading bending creep test device as shown in figures 1 and 2 can effectively solve the defect of load change in a beam creep test and continuously keep load stable, specifically, the device can load at least two concrete test pieces simultaneously, taking two concrete test pieces 11 as an example, a support 12 is arranged between the two test pieces, wherein the outer surfaces of the two test pieces 11 to be loaded are respectively attached with a loading plate 2 with two ends extending out of the edge of the test piece, two ends of the two loading plates 2 are respectively provided with a hole, a deformed steel bar 31 penetrates through the holes, the two deformed steel bars 31 are arranged in parallel, the outer surface of one loading plate 2 is attached with a mechanical jack 4 for applying load to the test piece, the other end of the mechanical jack 4 is provided with a first bearing plate 51, the other loading plate is also provided with a second bearing plate 52 at intervals, two ends of the deformed steel bar 31 respectively penetrate through the first bearing plate 51, The second bearing plate 52 is anchored at the penetrating position through the nut 32, the elastic component 6 is sleeved on the deformed steel bar section between the second bearing plate 52 and the loading plate 2 arranged at a distance from the second bearing plate, the elastic component 6 is always in a compression state, the elastic component 6 is preferably a high-stiffness spring, and once the load unloading condition of the test piece 11 occurs in the loading process, the elastic component 6 can automatically and accurately supplement the load, so that the purpose of long-term constant loading of the test piece is achieved, and the load condition borne by the test piece does not need to be monitored constantly.
This test device passes through each bearing plate of screw-thread steel connection, load plate and mechanical jack, makes the whole series connection of test piece and test device, concentrates the loading by mechanical jack to the test piece, has overturned the traditional way that needs large-scale counterforce wall or earth anchor of long-time use, and need not to receive the restriction in test place again during the experiment.
The loading plate 2 is arranged on the surface of the test piece, so that the whole load applied by the mechanical jack 4 can be uniformly loaded on the test piece 11, and eccentric stress is prevented. In addition, in order to prevent the stress of the test piece from being uneven due to the fact that the pressure bearing plates (namely the first pressure bearing plate and the second pressure bearing plate) and the loading plate are buckled and deformed under the action of nuts to the maximum extent, the loading plate 2 and the pressure bearing plates are preferably made of thickened Q235 steel plates, the thickness of the loading plate 2 is selected from 18 mm to 25mm, the thickness of each pressure bearing plate is selected from 25mm to 35mm, the plane size is correspondingly adjusted according to the size of the loaded test piece, in the embodiment, the plane size of the loading plate and the plane size of each pressure bearing plate are selected from 180 mm to 240mm, the thickness of the loading plate is 20mm, and the thickness of each pressure bearing plate is 30 mm.
In order to monitor the loading condition of the test piece, a steel string type pressure sensor 7 for reading a loading value can be arranged at the connecting position of the first bearing plate 51 and the mechanical jack 4; meanwhile, the vibrating wire strain gauges 8 are arranged at the bottoms of the test pieces (namely the positions with the maximum strain) and the side faces of the load loading positions (namely the side faces facing the deformed steel bars) and are used for observing the long-term strain condition of the test pieces; a dial indicator 9 is further arranged at the support 12 and used for measuring the deformation of the support, and the dial indicator 9 is also arranged at the midpoint of the side face of the test piece facing the deformed steel and used for measuring the deformation of the test piece.
The working principle of the test device is as follows: the bottom of the mechanical jack 4 transmits the load to the upper concrete test piece through the loading plate 2, the top of the mechanical jack 4 transmits the load to the loading plate 2 through the deformed steel bar 31, the first bearing plate 51 and the anchoring nut 32 and then transmits the load to the lower concrete test piece, and the steel string type pressure sensor 7 reads the loading value, so that the aim of balancing the upper load and the lower load mutually is fulfilled and self balance is achieved; in the loading process, once the load is unloaded, the elastic component 6 automatically carries out load supplement, and the long-term constant loading of the test piece is realized.
Before the test, the maximum bending moment and the maximum external load at the maximum position of the midspan section are calculated according to the section size and the reinforcement ratio of the test piece, and the external load of the test is required to be less than or equal to 0.4 time of the maximum external load so as to determine the loading load of the mechanical jack 4 during the final test; the specification of the mechanical jack 4 is selected according to the loading load, and the maximum loading force of the general mechanical jack 4 needs to be twice of the external load, so that the loading force of the mechanical jack can be slightly stable in the long-term loading process.
The bearing capacity specification of the elastic component 6 used by the test device is 0.6-0.8 times of the load borne by the test piece; the deformed steel 31 is finish-rolled deformed steel, the tensile strength of the deformed steel is 3-4 times of the load borne by the test piece, and the deformed steel is deformed more and less when the rigidity of the deformed steel is larger.
The steel wire type pressure sensor 7, the vibrating wire type strain gauge 8 and the dial indicator 9 are all selected from non-electric equipment so as to prevent the phenomena of loss and inaccuracy of measured data caused by sudden power failure of a laboratory.
The test device of the application is verified through practical application, can be used for a concrete test piece bending creep test with the external load of 12t, and can keep long-term stable loading of the external load.
It should be understood that the above-mentioned embodiments are only examples for clearly illustrating the technical solutions of the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. The utility model provides a crooked creep test device of invariable loading of self-balancing, a serial communication port, load two at least concrete samples simultaneously, set up the support between the test piece, two test piece surfaces in the outside all laminate and are provided with the load plate that both ends stretch out in the test piece edge, two parallel run-through in load plate both ends set up two screw-thread steels, the laminating of load plate department sets up the jack that applies load to the test piece, the jack other end is provided with first bearing plate, another load plate department still is the interval and is provided with the second bearing plate, the screw-thread steel both ends run through first bearing plate respectively, the second bearing plate passes through the nut anchor in the department of running through, the cover is equipped with elastomeric element on the screw-thread steel between second bearing plate and the load plate rather than being the interval setting, elastomeric element is the compression state all the time.
2. The self-balancing constant load flexural creep test apparatus of claim 1, wherein the resilient member is a high rate spring.
3. The self-balancing constant-load bending creep test device according to claim 1 or 2, wherein the loading capacity of the elastic member is selected to be 0.6 to 0.8 times of the load applied to the test piece.
4. The self-balancing constant-loading bending creep test device according to claim 1, wherein the tensile strength of the deformed steel bar is 3-4 times of the load applied to the test piece.
5. The self-balancing constant-loading bending creep test device according to claim 1, wherein the loading plate is made of a thickened Q235 steel plate, and the thickness of the loading plate is 18-25 mm.
6. The self-balancing constant-load bending creep test device according to claim 1, wherein the first bearing plate and the second bearing plate are both made of thickened Q235 steel plates, and the thickness is 25-35 mm.
7. The apparatus of claim 1, wherein a string-type pressure sensor is disposed at the connection position of the first bearing plate and the jack for reading the loading value.
8. The apparatus as claimed in claim 1, wherein a vibrating wire strain gauge is provided at the maximum strain position of each test piece for observing strain.
9. The self-balancing constant-loading flexural creep test device of claim 1 or 8, characterized in that the side of the test piece facing the deformed steel bar is also provided with a vibrating wire strain gauge for observing strain.
10. The self-balancing constant-loading bending creep test device according to claim 1, wherein a dial indicator is arranged at the support for measuring the deformation of the support, and a dial indicator is arranged at the midpoint of the side surface of the test piece facing the deformed steel for measuring the deformation of the test piece.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022930512.1U CN214173967U (en) | 2020-12-09 | 2020-12-09 | Self-balancing constant loading bending creep test device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022930512.1U CN214173967U (en) | 2020-12-09 | 2020-12-09 | Self-balancing constant loading bending creep test device |
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| CN214173967U true CN214173967U (en) | 2021-09-10 |
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| CN202022930512.1U Expired - Fee Related CN214173967U (en) | 2020-12-09 | 2020-12-09 | Self-balancing constant loading bending creep test device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114235371A (en) * | 2021-12-18 | 2022-03-25 | 中国兵器工业第五九研究所 | Empennage spring storage life evaluation test device |
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2020
- 2020-12-09 CN CN202022930512.1U patent/CN214173967U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114235371A (en) * | 2021-12-18 | 2022-03-25 | 中国兵器工业第五九研究所 | Empennage spring storage life evaluation test device |
| CN114235371B (en) * | 2021-12-18 | 2023-07-07 | 中国兵器工业第五九研究所 | Tail spring storage life evaluation test device |
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Granted publication date: 20210910 |