CN112629836A - Automatic compensation device for prestress loss - Google Patents
Automatic compensation device for prestress loss Download PDFInfo
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- CN112629836A CN112629836A CN202011177840.7A CN202011177840A CN112629836A CN 112629836 A CN112629836 A CN 112629836A CN 202011177840 A CN202011177840 A CN 202011177840A CN 112629836 A CN112629836 A CN 112629836A
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- accommodating cavity
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- stress
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/14—Measuring force or stress, in general by measuring variations in capacitance or inductance of electrical elements, e.g. by measuring variations of frequency of electrical oscillators
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/04—Chucks
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0017—Tensile
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0676—Force, weight, load, energy, speed or acceleration
Abstract
The invention provides an automatic compensation device for prestress loss. The automatic compensating device for the prestress loss comprises: a test piece holding device and a stress compensation anchorage; the test piece holding device includes: a first accommodating cavity and a fixing component; the stress compensating anchor comprises: the device comprises an anchorage device body, a test piece clamping device, an induction electromagnetic coil, a controller and a stress compensation electromagnetic device; the anchor body includes: a second containing cavity and a loading anchoring assembly; the induction electromagnetic coil is arranged at the front part in the second accommodating cavity, the stress compensation electromagnetic device is arranged at the rear part in the second accommodating cavity, and the controller is electrically connected with the induction electromagnetic coil and the stress compensation electromagnetic device respectively; the test piece clamping device is arranged in the cavity of the induction electromagnetic coil and used for clamping the test piece to be tested. The invention can realize the automatic compensation of the prestress loss of the piece to be tested.
Description
Technical Field
The application relates to the technical field of prestressed structures, in particular to a prestressed loss automatic compensation device.
Background
Modern prestressed structures are highly efficient structures designed and built by using high-performance materials, modern design theories and advanced construction processes. Compared with a non-prestressed structure, the modern prestressed structure not only has the advantages of large spanning capability, good stress performance, superior service performance, high durability, lightness, attractiveness and the like, but also has the effects of being more economical, material-saving and energy-saving compared with other structures. Therefore, modern prestressed structures have a wide development prospect, have penetrated into various fields of civil engineering, and are one of the indispensable important forms for building high-rise buildings, high-rise structures, large spans, large space structures, heavy-load structures, special structures and special-purpose engineering.
At present, various kinds of novel material prestressed members are gradually becoming hot spots for research and application in civil engineering. In practical engineering, the application of novel material prestressed members in structures is increasing, so that the research on the durability of various materials under the coupling action of stress and environment is more important. However, under the action of long-term high stress, the prestressed component has adverse effects such as test piece creep and anchor deformation, inevitably causes the reduction of stress level, exerts great influence on the structure reinforcement and the material strength, and seriously influences the actual test result.
At present, many scholars at home and abroad test and theoretically research the durability of various materials under the coupling action of stress and environment. However, the problem of loss of prestress has to be looked at during the test. In the prior art, there is no better way to avoid loss of prestress other than overstretching or measuring and compensating stress by time period. However, the test piece is subjected to over-tensioning, so that uncontrollable damage to the test piece can be caused, and the test accuracy and the structural safety are seriously influenced; and if the stress is artificially supplemented, the stress damage needs to be timely detected and supplemented by a loading device, so that a large amount of manpower and material resources are consumed, and the method is quite uneconomical.
Therefore, in order to ensure the accuracy of the durability research of the test piece under the coupling action of the stress and the corrosion environment and promote the development of the durability research, in order to keep the stress level of the test piece in the loading state unchanged, a device which can monitor the stress loss of the test piece in the loading prestress state in time and automatically compensate the stress loss to the specified level is needed.
Disclosure of Invention
In view of this, the present invention provides an automatic compensation device for pre-stress loss, so as to realize automatic compensation for pre-stress loss of a test piece.
The technical scheme of the invention is realized as follows:
an automatic compensating device for loss of prestress, comprising: a test piece holding device and a stress compensation anchorage;
the test piece holding device includes: a first accommodating cavity and a fixing component;
the front end of the first accommodating cavity is provided with a fixing hole for a to-be-tested part to pass through, the rear end of the first accommodating cavity is provided with a loading end, and the loading end is provided with a first loading hole for the to-be-tested part to pass through; the first accommodating cavity is also provided with an outlet and an inlet;
the fixing assembly is arranged at the fixing hole of the first accommodating cavity and used for clamping and fixing one end of a piece to be tested;
the stress compensating anchor comprises: the device comprises an anchorage device body, a test piece clamping device, an induction electromagnetic coil, a controller and a stress compensation electromagnetic device;
the anchor body includes: a second containing cavity and a loading anchoring assembly;
the front end of the second accommodating cavity is provided with a connecting part which is used for being fixedly connected with the loading end of the first accommodating cavity; the connecting part is provided with a second loading hole for the tested piece to pass through; the rear end of the second accommodating cavity is provided with a third loading hole for a to-be-tested part to pass through;
the loading anchoring assembly is arranged at a third loading hole of the second accommodating cavity and used for clamping and fixing the other end of the piece to be tested;
the induction electromagnetic coil is arranged at the front part in the second accommodating cavity, the stress compensation electromagnetic device is arranged at the rear part in the second accommodating cavity,
the controller is respectively electrically connected with the induction electromagnetic coil and the stress compensation electromagnetic device;
the test piece clamping device is arranged in the cavity of the induction electromagnetic coil and used for clamping the test piece to be tested.
Preferably, the controller includes: the device comprises an inductance monitor, an inductance converter, a central processing unit, a transformer and a compensation power supply;
the input end of the inductance monitor is electrically connected with the induction electromagnetic coil; the output end of the inductance monitor is electrically connected with the input end of the inductance converter;
the output end of the inductance converter is electrically connected with the input end of the central processing unit;
the output end of the central processing unit is electrically connected with the input end of the transformer;
the compensation power supply is electrically connected with the input end of the transformer;
and the output end of the transformer is electrically connected with the input end of the stress compensation electromagnetic device.
Preferably, the test piece holding device is made of a high-strength channel steel material.
Preferably, the fixing assembly includes: a first sleeve and a first anchor bolt;
the first sleeve is clamped at one end of the piece to be tested, and one end of the first sleeve penetrates through the fixing hole of the first accommodating cavity; the outer wall of the first sleeve is provided with an external thread;
the first anchor bolt is connected with the first sleeve through the external thread of the first sleeve.
Preferably, the load anchor assembly comprises: a second sleeve and a second anchor bolt;
the second sleeve is clamped at the other end of the piece to be tested, and one end of the second sleeve penetrates through a third loading hole of the second accommodating cavity; the outer wall of the second sleeve is provided with an external thread;
the second anchor bolt is connected with the second sleeve through the external thread of the second sleeve.
Preferably, the first sleeve is connected with the fixing hole of the first accommodating cavity through epoxy resin or structural adhesive;
the second sleeve is connected with the third loading hole of the second accommodating cavity through epoxy resin or structural adhesive.
Preferably, the test medium is a test solution.
As can be seen from the above, in the automatic compensation device for prestress loss according to the present invention, since the test piece holding device is provided and the first accommodating chamber is provided in the test piece holding device, a test medium required for a test can be added into the first accommodating chamber, so that the test piece to be tested is in full contact with the test medium in the first accommodating chamber, and thus environmental conditions such as aging and corrosion of the test piece to be tested can be simulated. In addition, because the stress compensation anchorage device is arranged, when the prestress loss occurs to the piece to be tested in the test process, the piece clamping device clamped on the piece to be tested is driven to displace, so that the inductance in the induction electromagnetic coil is changed; the controller can detect the change of the inductance in the induction solenoid in real time, and adjust the voltage at the two ends of the stress compensation electromagnet according to the change of the inductance, and control the size of the magnetic force of the stress compensation electromagnet on the test piece clamping device, so that the corresponding pulling force can be provided for the test piece to be tested through the test piece clamping device, the automatic compensation of the prestress loss of the test piece to be tested is realized, the test piece to be tested can be always kept at the stress level of the test design, and the accuracy of the durability test under the load can be greatly improved.
Drawings
Fig. 1 is a schematic structural diagram of an automatic compensation device for loss of prestress according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a test piece holding device in the embodiment of the present invention.
FIG. 3 is a schematic view of a stress compensating anchor according to an embodiment of the present invention.
Fig. 4 is a schematic structural diagram of a specimen clamping device in an embodiment of the present invention.
Detailed Description
In order to make the technical scheme and advantages of the invention more apparent, the invention is further described in detail with reference to the accompanying drawings and specific embodiments.
Fig. 1 is a schematic structural diagram of an automatic compensation device for loss of prestress according to an embodiment of the present invention.
As shown in fig. 1 to 4, the automatic compensating device for prestress loss according to the embodiment of the present invention includes: a test piece holding device 11 and a stress compensation anchorage 12;
the specimen holding device 11 includes: a first housing chamber 21 and a fixing member 22;
a fixing hole 23 for a to-be-tested part 10 to pass through is formed in the front end of the first accommodating cavity 21, a loading end 24 is formed in the rear end of the first accommodating cavity 21, and a first loading hole 25 for the to-be-tested part to pass through is formed in the loading end 24;
the fixing component 22 is arranged at the fixing hole 23 of the first accommodating cavity and used for clamping and fixing one end of the piece to be tested 10;
the stress compensating anchorage 12 comprises: the device comprises an anchorage device body 31, a test piece clamping device 32, an induction electromagnetic coil 33, a controller 34 and a stress compensation electromagnetic device 35;
the anchor body 31 includes: a second housing chamber 41 and a load anchor assembly 42;
the front end of the second accommodating cavity 41 is provided with a connecting part 43 which is fixedly connected with the loading end 24 of the first accommodating cavity; the connecting part 43 is provided with a second loading hole 44 for the tested piece 10 to pass through; the rear end of the second accommodating cavity 41 is provided with a third loading hole 45 for the tested piece 10 to pass through;
the loading anchoring assembly 42 is arranged at the third loading hole 45 of the second accommodating cavity 41 and is used for clamping and fixing the other end of the test piece 10 to be tested;
the induction electromagnetic coil 33 is disposed in the front portion in the second accommodation chamber 41, the stress compensation electromagnetic coil 35 is disposed in the rear portion in the second accommodation chamber 41,
the controller 34 is electrically connected to the induction electromagnetic coil 33 and the stress compensation electromagnetic coil 35, respectively;
the test piece holding device 32 is arranged in the cavity of the induction electromagnetic coil 33 and is used for holding the test piece 10 to be tested.
When the automatic compensation device for the prestress loss is used, a test piece to be tested can be inserted into a fixing hole of a first accommodating cavity of a test piece holding and loading device, sequentially pass through the first accommodating cavity, a first loading hole of the first accommodating cavity, a second loading hole of the second accommodating cavity, the test piece clamping device, the induction electromagnetic coil, the stress compensation electromagnetic device and a third loading hole, penetrate out of the third loading hole, and then a loading end of the first accommodating cavity of the test piece holding and loading device is fixedly connected with a connecting part of the second accommodating cavity of the stress compensation anchorage device. Then, the front end of the test piece to be tested can be clamped and fixed through a fixing component of the test piece carrying device; then, applying corresponding prestress on the rear end of the piece to be tested; and finally, clamping and fixing the rear end of the piece to be tested through a loading anchoring assembly of the stress compensation anchorage device.
In addition, a test medium for testing the piece to be tested can be added into the first accommodating cavity of the test piece holding device, so that the piece to be tested is in full contact with the test medium in the first accommodating cavity, and corresponding environmental conditions are provided for tests of simulating aging, corrosion and the like of the piece to be tested.
When the test is carried out, prestress with a preset size can be applied to one end of the piece to be tested through external prestress loading equipment. If the piece to be tested creeps in the testing process and the prestress loss occurs (the loss is set to be delta F), the piece to be tested drives the test piece clamping device clamped on the piece to be tested to displace (recorded as delta S). The specimen holder is displaced because the specimen to be tested is deformed (denoted as Δ ∈). The small displacement of the specimen holder will cause the inductance change (denoted as Δ L) in the induction coil, and the magnitude of the inductance change is related to the magnitude of the displacement (material deformation), which reflects the stress loss. The controller can detect the change of the inductance in the induction electromagnetic coil in real time, adjust the voltage at two ends of the stress compensation electromagnetic device according to the change of the inductance, and control the magnetic force of the stress compensation electromagnetic device on the test piece clamping device, so that the corresponding pulling force can be provided for the test piece to be tested through the test piece clamping device, and the automatic compensation of the prestress loss (delta F) of the test piece to be tested is realized.
In addition, in the technical solution of the present invention, the controller described above may be implemented using various implementation methods. The technical solution of the present invention will be described in detail below by taking one implementation manner as an example.
For example, as shown in fig. 3, in a preferred embodiment of the present invention, the controller 34 comprises: an inductance monitor 51, an inductance converter 52, a central processing unit 53, a transformer 54 and a compensation power supply 55;
the input end of the inductance monitor 51 is electrically connected with the induction electromagnetic coil 33; the output end of the inductance monitor 51 is electrically connected with the input end of the inductance converter 52;
the output end of the inductance converter 52 is electrically connected with the input end of the central processing unit 53;
the output end of the central processing unit 53 is electrically connected with the input end of the transformer 54;
the compensation power supply 55 is electrically connected with the input end of the transformer 54;
the output of the transformer 54 is electrically connected to the input of the stress-compensating electromagnet 35.
When the controller is used, if the piece to be tested creeps in the testing process and the prestress loss occurs (the loss amount is set to be delta F), the piece to be tested drives the test piece clamping device clamped on the piece to be tested to displace (recorded as delta S). The small displacement of the test piece clamping device can cause the change of the inductance in the induction electromagnetic coil (marked as delta L), an inductance monitor connected with the induction electromagnetic coil can detect the change of the inductance in the induction electromagnetic coil, can convert the change of the inductance into a current signal (marked as delta I), and transmits the current signal to a central processing unit after processing; the central processing unit can calculate the displacement of the test piece clamping device and the corresponding prestress loss of the test piece to be tested according to the received current signal and various preset or stored material parameters (such as elastic modulus and other parameters) of the test piece to be tested, so that a corresponding transformation instruction can be sent to the transformer according to the calculation result; the input end of the transformer is connected with the compensation power supply, so that the transformer can amplify the voltage output by the compensation power supply and then output the amplified voltage through the output end; in addition, the output end of the transformer is also connected with the stress compensation electromagnet, so that the transformer can adjust the voltage at two ends of the stress compensation electromagnet according to the received transformation instruction (for example, increase or decrease the voltage at two ends of the stress compensation electromagnet) to adjust the magnetic force of the stress compensation electromagnet on the test piece clamping device, so that the test piece to be tested can be provided with corresponding pulling force through the test piece clamping device, thereby realizing the automatic compensation of the prestress loss (delta F) of the test piece to be tested, and enabling the test piece to be tested to be always kept at the stress level of the test design.
In addition, as shown in fig. 1 and 2, for example, in a preferred embodiment of the present invention, the first accommodating chamber 21 is further provided with an outlet 26 and an inlet 27.
Thus, the test medium in the environment can be measured, supplemented or replaced according to a specific test protocol when performing the test.
Additionally, by way of example, in a preferred embodiment of the present invention, the test medium may be a test solution.
In addition, as an example, in a preferred embodiment of the present invention, the specimen holder may be made of a high-strength channel steel material.
In addition, as an example, in a preferred embodiment of the present invention, the fixing assembly 22 may include: a first bushing 221 and a first anchor bolt 222;
the first sleeve 221 is clamped at one end of the test piece 10 to be tested, and one end of the first sleeve 221 passes through the fixing hole 23 of the first accommodating cavity 21; an external thread is arranged on the outer wall of the first sleeve 221;
the first anchor bolt 222 is connected to the first bushing 221 through the external thread of the first bushing 221.
Through foretell first sleeve pipe and first anchor bolt, can be with the one end centre gripping of waiting to test the piece and fix in the fixed orifices department of first holding the chamber.
Additionally, by way of example, in a preferred embodiment of the present invention, the load anchor assembly 42 may include: a second sleeve 421 and a second anchor bolt 422;
the second sleeve 421 is clamped at the other end of the test piece 10, and one end of the second sleeve 421 passes through the third loading hole 45 of the second accommodating cavity 41; an external thread is arranged on the outer wall of the second sleeve 421;
the second anchor bolt 422 is connected to the second sleeve 421 through the external thread of the second sleeve 421.
Through foretell second sleeve pipe and second anchor bolt, can hold and fix the other end centre gripping of waiting to test the piece in the third loading hole department that the second held the chamber.
In addition, as an example, in a preferred embodiment of the present invention, the first sleeve is connected to the fixing hole of the first accommodating cavity by epoxy resin or structural adhesive; the second sleeve is connected with the third loading hole of the second accommodating cavity through epoxy resin or structural adhesive.
In summary, in the technical solution of the present invention, because the test piece holding device is provided, and the first accommodating cavity is provided in the test piece holding device, a test medium required by a test can be added into the first accommodating cavity, so that the test piece to be tested is in full contact with the test medium in the first accommodating cavity, thereby simulating environmental conditions such as aging and corrosion of the test piece to be tested. In addition, because the stress compensation anchorage device is arranged, when the prestress loss occurs to the piece to be tested in the test process, the piece clamping device clamped on the piece to be tested is driven to displace, so that the inductance in the induction electromagnetic coil is changed; the controller can detect the change of the inductance in the induction solenoid in real time, and adjust the voltage at the two ends of the stress compensation electromagnet according to the change of the inductance, and control the size of the magnetic force of the stress compensation electromagnet on the test piece clamping device, so that the corresponding pulling force can be provided for the test piece to be tested through the test piece clamping device, the automatic compensation of the prestress loss of the test piece to be tested is realized, the test piece to be tested can be always kept at the stress level of the test design, and the accuracy of the durability test under the load can be greatly improved.
In the technical scheme of the invention, the automatic compensation device for the prestress loss can monitor the prestress loss of the piece to be tested in real time, so that the automatic compensation device has a strong real-time monitoring function; and when the pre-stress loss of the piece to be tested occurs in the testing process, the pre-stress loss of the piece to be tested can be automatically compensated in real time without manual intervention, so that the compensation of the pre-stress loss is more rapid and convenient. Furthermore, it is generally difficult to detect manually when the test piece is slightly deformed. However, when the automatic compensating device for the loss of prestress is used, even if the displacement of the specimen holder changes only slightly, the inductance of the induction coil changes, and therefore the change is detected by the controller, and the loss of prestress of the specimen to be tested is automatically compensated, so that the accuracy of the compensation is relatively high.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (7)
1. An automatic compensating device for loss due to prestress, comprising: a test piece holding device and a stress compensation anchorage;
the test piece holding device includes: a first accommodating cavity and a fixing component;
the front end of the first accommodating cavity is provided with a fixing hole for a to-be-tested part to pass through, the rear end of the first accommodating cavity is provided with a loading end, and the loading end is provided with a first loading hole for the to-be-tested part to pass through; the first accommodating cavity is also provided with an outlet and an inlet;
the fixing assembly is arranged at the fixing hole of the first accommodating cavity and used for clamping and fixing one end of a piece to be tested;
the stress compensating anchor comprises: the device comprises an anchorage device body, a test piece clamping device, an induction electromagnetic coil, a controller and a stress compensation electromagnetic device;
the anchor body includes: a second containing cavity and a loading anchoring assembly;
the front end of the second accommodating cavity is provided with a connecting part which is used for being fixedly connected with the loading end of the first accommodating cavity; the connecting part is provided with a second loading hole for the tested piece to pass through; the rear end of the second accommodating cavity is provided with a third loading hole for a to-be-tested part to pass through;
the loading anchoring assembly is arranged at a third loading hole of the second accommodating cavity and used for clamping and fixing the other end of the piece to be tested;
the induction electromagnetic coil is arranged at the front part in the second accommodating cavity, the stress compensation electromagnetic device is arranged at the rear part in the second accommodating cavity,
the controller is respectively electrically connected with the induction electromagnetic coil and the stress compensation electromagnetic device;
the test piece clamping device is arranged in the cavity of the induction electromagnetic coil and used for clamping the test piece to be tested.
2. The automatic compensating apparatus for loss of prestress according to claim 1, wherein said controller comprises: the device comprises an inductance monitor, an inductance converter, a central processing unit, a transformer and a compensation power supply;
the input end of the inductance monitor is electrically connected with the induction electromagnetic coil; the output end of the inductance monitor is electrically connected with the input end of the inductance converter;
the output end of the inductance converter is electrically connected with the input end of the central processing unit;
the output end of the central processing unit is electrically connected with the input end of the transformer;
the compensation power supply is electrically connected with the input end of the transformer;
and the output end of the transformer is electrically connected with the input end of the stress compensation electromagnetic device.
3. The automatic compensating device for loss of prestress according to claim 1, wherein:
the test piece holding device is made of high-strength channel steel materials.
4. The automatic pre-stress loss compensation apparatus according to claim 1, wherein the fixing assembly comprises: a first sleeve and a first anchor bolt;
the first sleeve is clamped at one end of the piece to be tested, and one end of the first sleeve penetrates through the fixing hole of the first accommodating cavity; the outer wall of the first sleeve is provided with an external thread;
the first anchor bolt is connected with the first sleeve through the external thread of the first sleeve.
5. The automatic pre-stress loss compensation apparatus according to claim 1, wherein the load-anchor assembly comprises: a second sleeve and a second anchor bolt;
the second sleeve is clamped at the other end of the piece to be tested, and one end of the second sleeve penetrates through a third loading hole of the second accommodating cavity; the outer wall of the second sleeve is provided with an external thread;
the second anchor bolt is connected with the second sleeve through the external thread of the second sleeve.
6. The automatic compensating device for loss of prestress according to claim 1, wherein:
the first sleeve is connected with the fixing hole of the first accommodating cavity through epoxy resin or structural adhesive;
the second sleeve is connected with the third loading hole of the second accommodating cavity through epoxy resin or structural adhesive.
7. The automatic compensating device for loss of prestress according to claim 1, wherein:
the test medium is a test solution.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011177840.7A CN112629836B (en) | 2020-10-29 | 2020-10-29 | Automatic compensation device for prestress loss |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011177840.7A CN112629836B (en) | 2020-10-29 | 2020-10-29 | Automatic compensation device for prestress loss |
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| CN112629836A true CN112629836A (en) | 2021-04-09 |
| CN112629836B CN112629836B (en) | 2022-08-26 |
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2020
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| JP2013050391A (en) * | 2011-08-31 | 2013-03-14 | Oita-Ken Sangyosozokiko | Stress-loading type single-plate magnetism tester |
| CN103376222A (en) * | 2013-05-02 | 2013-10-30 | 东南大学 | Constant-temperature stress corrosion testing device and method for FRP (fiber reinforced polymer) tendon |
| CN104007058A (en) * | 2014-06-13 | 2014-08-27 | 东南大学 | Portable type metal wire stretching stress corrosion testing device |
| CN208329016U (en) * | 2018-04-28 | 2019-01-04 | 青岛理工大学 | A kind of fiber bar anti-float anchor rod mechanical characteristic simulation laboratory test device |
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