CN115683993A - Stress corrosion test device of stock steel - Google Patents
Stress corrosion test device of stock steel Download PDFInfo
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- CN115683993A CN115683993A CN202211356818.8A CN202211356818A CN115683993A CN 115683993 A CN115683993 A CN 115683993A CN 202211356818 A CN202211356818 A CN 202211356818A CN 115683993 A CN115683993 A CN 115683993A
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- 238000012360 testing method Methods 0.000 title claims abstract description 119
- 230000007797 corrosion Effects 0.000 title claims abstract description 116
- 238000005260 corrosion Methods 0.000 title claims abstract description 116
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 20
- 239000010959 steel Substances 0.000 title claims abstract description 20
- 239000004570 mortar (masonry) Substances 0.000 claims abstract description 20
- 238000007789 sealing Methods 0.000 claims abstract description 18
- 239000011435 rock Substances 0.000 claims abstract description 13
- 229910052755 nonmetal Inorganic materials 0.000 claims abstract description 7
- 239000007788 liquid Substances 0.000 claims description 13
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
- 239000007769 metal material Substances 0.000 claims description 3
- 230000001133 acceleration Effects 0.000 abstract description 2
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 abstract description 2
- 230000008859 change Effects 0.000 abstract description 2
- 239000003921 oil Substances 0.000 description 36
- 238000004873 anchoring Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
A stress corrosion test device for anchor rod steel comprises a corrosion test device module and a stress loading device module, wherein the corrosion test device module comprises a mortar anchor rod, a rock sample, a corrosion-resistant non-metal cover, a U-shaped opening stress corrosion test groove, a first sealing ring, a lockset, a base plate, a rubber cushion, an anchor rod, a stress corrosion test tube, a rubber plug, a second sealing ring and a fastening nut; the U-shaped opening stress corrosion test groove and the stress corrosion test tube are both connected with the stress loading device module. The stress corrosion test device can selectively test different types of test pieces of the anchor rod or the mortar anchor rod; a separate hydraulic jack is adopted, so that the limit of the field size is avoided; the extending part of the anchor rod can provide conditions for carrying out electrochemical acceleration test; the independent corrosion cylinder test device can test steel bar test pieces with different performances, and the performance change of the steel bars can be clearly and visually seen through the piston rod of the jack.
Description
Technical Field
The invention relates to the technical field of corrosion test devices, in particular to a stress corrosion test device for anchor rod steel.
Background
The prestressed anchoring technology is an indispensable part in engineering construction no matter underground coal mining, highway and railway construction or slope supporting engineering nowadays. Anchor rod anchoring belongs to concealed engineering, the engineering geological conditions of the anchoring structures such as a prestressed anchor rod and an anchor rope, which are contacted in the construction process, are very complicated, and the anchoring effect is determined by the performance of the anchor rod. Research shows that the traditional anchor rods, anchor cables and other supporting structures are easy to damage and lose efficacy when large deformation occurs, and rock mass cannot be effectively reinforced and controlled. As a metal material, the anchor rod is very easy to corrode under a complex geological environment under the multi-factor combined action environment, and the corrosive medium and the stress action condition are the main reasons of stress corrosion of the anchor rod. Therefore, it is very necessary to reasonably determine the influence of the combined action of the corrosive medium and the stress on the mechanical property of the anchor rod by using scientific experiments.
At present, a stress corrosion device mostly adopts a pool-shaped or integral multi-anchor rod corrosion test device, and an anchor rod or a mortar anchor rod cannot be subjected to a selective test and cannot be independently loaded; the occupied area is large; the intuitiveness of observing the corrosion condition of the anchor rod is poor; and the anchor rod with a long test period cannot be provided with an electrochemical accelerating device for accelerating the test.
Disclosure of Invention
The invention aims to provide a stress corrosion test device for anchor rod steel, which aims to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a stress corrosion test device for anchor rod steel comprises a corrosion test device module and a stress loading device module, wherein the corrosion test device module comprises a mortar anchor rod, a rock sample, a corrosion-resistant non-metal cover, a U-shaped opening stress corrosion test groove, a first sealing ring, a lock, a base plate, a rubber cushion, an anchor rod, a stress corrosion test pipe, a rubber plug, a second sealing ring and a fastening nut;
the number of the U-shaped opening stress corrosion test grooves is one, and the number of the stress corrosion test tubes is two;
the U-shaped port stress corrosion test groove and the two stress corrosion test pipes are connected with a stress loading device module;
the stress loading device module comprises a jack, a jack supporting base, a manual hydraulic pump and a rubber oil pipe;
the U-shaped opening stress corrosion test groove is fixedly connected with the jack through the fastening nut;
anchor rod extending openings are formed in two sides of the U-shaped opening stress corrosion test groove, and the mortar anchor rod is horizontally placed in the U-shaped opening rock corrosion test groove;
a rubber cushion is placed at the bottom of the U-shaped opening stress corrosion test groove, and the corrosion-resistant non-metal cover is placed on the U-shaped opening stress corrosion test groove;
the lock is used for locking and fixing the mortar anchor rod, and a rubber cushion is placed between the lock and the U-shaped opening stress corrosion test groove;
the contact part of the mortar anchor rod and the U-shaped opening stress corrosion test groove is sealed by the first sealing ring;
the anchor rod horizontally penetrates through an anchor rod extending port of the stress corrosion test tube; the contact part of the anchor rod and the stress corrosion test tube is sealed by the second sealing ring;
the jack is provided with two pressure screw connectors, and the manual hydraulic pump is connected with the jack through a rubber oil pipe;
the jack is placed on the jack support base, and the piston rod is placed in the oil cylinder;
the spoke type pressure sensor is fixed between the piston rod and the ejector head.
Preferably, the upper side of the U-shaped port stress corrosion test groove is opened for injecting the corrosive liquid.
Preferably, the upper side of the stress corrosion test tube is provided with a corrosive liquid injection port and a rubber plug for injecting corrosive liquid.
Preferably, the manual hydraulic pump comprises an oil outlet and an oil inlet, and a first pressure gauge is mounted in front of the oil outlet and used for displaying the magnitude of applied pressure;
and a locking valve is arranged in front of the first pressure gauge and used for locking the applied pressure value.
Preferably, a pressure relief valve is arranged in front of an oil inlet of each manual hydraulic pump, and a second pressure gauge is arranged above the oil inlet and used for displaying the output pressure during pressure relief.
Preferably, a loading handle is arranged on the right side of the pressure relief valve.
Preferably, each manual hydraulic pump is provided with an oil filling port at one end.
Preferably, the U-shaped opening stress corrosion test groove and the stress corrosion test pipe are made of corrosion-resistant non-metallic materials.
Compared with the prior art, the invention has the beneficial effects that:
(1) The corrosion resistance of the steel bar can be tested and evaluated through a full-scale test;
(2) The stress corrosion test device can selectively test different types of test pieces of the anchor rod or the mortar anchor rod;
(3) A separate hydraulic jack is adopted, so that the limit of the field size is avoided;
(4) The extending part of the anchor rod can provide conditions for carrying out electrochemical acceleration test;
(5) The independent corrosion cylinder test device can test steel bar test pieces with different performances, and the performance change of the steel bars can be clearly and visually seen through the piston rod of the jack.
Drawings
Fig. 1 is a top view of a device for testing stress corrosion of anchor rod steel according to an embodiment of the present invention;
FIG. 2 is a top view of a corrosion tester module provided by an embodiment of the present invention;
FIG. 3 is a cross-sectional view of a U-port stress corrosion test chamber in a corrosion test apparatus module according to an embodiment of the present invention;
FIG. 4 is a cross-sectional view of a stress corrosion test tube in a corrosion test apparatus module provided in accordance with an embodiment of the present invention;
FIG. 5 is a right side view of a corrosion tester module provided by an embodiment of the present invention;
FIG. 6 is a schematic diagram of a module of a stress loading apparatus according to an embodiment of the present invention;
FIG. 7 is a left side view of a jack according to an embodiment of the present invention;
fig. 8 is a schematic diagram of a manual hydraulic pump provided by an embodiment of the present invention.
In the figure: the device comprises a 1-1 mortar anchor rod, a 1-1-1 rock sample, a 1-2 corrosion-resistant non-metallic cover, a 1-3U-shaped opening stress corrosion test groove, a 1-3-1 anchor rod extension opening, a 1-4 first sealing ring, a 1-5 lockset, a 1-6 cushion plate, a 1-7 rubber cushion, a 1-8 anchor rod, a 1-9 stress corrosion test tube, a 1-10 rubber plug, a 1-11 second sealing ring, a 1-12 fastening nut, a 2-1 jack, a 2-1-1 piston rod, a 2-1-2 top head, a 2-1-3 spoke type pressure sensor, a 2-1-4 loading screw interface, a 2-1-5 oil cylinder, a 2-1-6 jack anchor rod opening, a 2-1-7 fastening nut, a 2-2 jack supporting base, a 2-3 manual hydraulic pump, a 2-3-1 oil outlet, a 2-3-2 first pressure gauge, a 2-3-3 locking valve, a 2-3-4 oil pipe, a 2-3-5 second pressure gauge, a 2-3-3 pressure gauge, a 2-3-3 oil inlet and a 2-3 rubber oil inlet.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-8, the present invention provides a technical solution: the corrosion test device module comprises 1-1 parts of a mortar anchor rod, 1-1-1 parts of a rock sample, 1-2 parts of a corrosion-resistant non-metallic cover, 1-3 parts of a U-shaped opening stress corrosion test groove, 1-4 parts of a first sealing ring, 1-5 parts of a lock, 1-6 parts of a backing plate, 1-7 parts of a rubber cushion, 1-8 parts of the anchor rod, 1-9 parts of a stress corrosion test tube, 1-10 parts of a rubber plug, 1-11 parts of a second sealing ring and 1-12 parts of a fastening nut;
the number of the U-shaped opening stress corrosion test grooves 1-3 is one, and the number of the stress corrosion test tubes 1-9 is two;
the stress corrosion test groove 1-3 with the U-shaped opening and the two stress corrosion test pipes 1-9 are connected with a stress loading device module;
the U-shaped opening stress corrosion test groove 1-3 is used for testing a rock sample 1-1-1 and a mortar anchor rod 1-1, and the two stress corrosion test pipes 1-9 are used for testing the anchor rod 1-8;
placing a test piece made of the rock sample 1-1-1 and the mortar anchor rod 1-1 into the U-shaped opening stress corrosion test groove 1-3 through a U-shaped opening, sleeving a first sealing ring 1-4 on two ends of the mortar anchor rod 1-1, injecting corresponding corrosive liquid into the U-shaped opening stress corrosion test groove 1-3, and covering the corrosion-resistant non-metal cover 1-2 after the completion of the injection of the corresponding corrosive liquid; the backing plate 1-6 penetrates through one end of the mortar anchor rod 1-1, is fixed by a fastening nut, and is locked by the lockset 1-5, and a rubber cushion 1-7 is placed between the lockset 1-5 and the U-shaped port stress corrosion test groove 1-3 to prevent slippage when tension is loaded; the anchor rods 1-8 horizontally penetrate through the stress corrosion test pipes 1-9; the contact part of the anchor rod 1-8 and the stress corrosion test tube 1-9 is sealed by the second sealing ring 1-11; injecting corrosive liquid from a liquid injection port on the upper side of the stress corrosion test tube 1-9, and then plugging by using a rubber plug 1-10 to prevent the corrosive liquid from evaporating; the backing plate 1-6 penetrates through one end of the anchor rod 1-8, is fixed by a fastening nut 1-12 and locks the anchor rod by the lockset 1-5.
The mortar anchor rod 1-1 and the anchor rod 1-8 horizontally penetrate through the anchor rod extending openings 2-1-6 respectively, and the corrosion test device module is fixedly connected with the jack 2-1 through the fastening nut 2-1-7.
The stress loading device module comprises a jack 2-1, a jack supporting base 2-2, a manual hydraulic pump 2-3 and a rubber oil pipe 2-4; the jack consists of a piston rod 2-1-1, a top 2-1-2, a spoke type pressure sensor 2-1-3, a loading screw connector 2-1-4 and an oil cylinder 2-1-5;
the jack 2-1 is provided with two loading screw connectors 2-1-4, and the manual hydraulic pump 2-3 is connected with the jack 2-1 through the rubber oil pipe 2-4; the jack 2-1 is placed on the jack support base 2-2; the piston rod 2-1-1 is horizontally arranged in the oil cylinder 2-1-5; the spoke type pressure sensor 2-3 is fixed between the piston rod 2-1-1 and the top 2-1-2.
The manual hydraulic pump comprises an oil outlet 2-3-1, a first pressure gauge 2-3-2, a locking valve 2-3-3, an oil inlet 2-3-4, a second pressure gauge 2-3-5, a pressure relief valve 2-3-6, a loading handle 2-3-7, an oil filling port 2-3-8 and an oil tank 2-3-9; the first pressure gauge 2-3-2 is arranged in front of the oil outlet 2-3-1 and used for displaying the magnitude of applied pressure; a locking valve 2-3-3 is arranged in front of the first pressure gauge 2-3-2 and used for locking an applied pressure value; a pressure relief valve 2-3-6 is arranged in front of an oil inlet 2-3-4 of each manual hydraulic pump, and a second pressure gauge 2-3-5 is arranged above the oil inlet 2-3-4 and used for displaying the output pressure during pressure relief; a loading handle 2-3-7 is arranged on the horizontal right side of the pressure relief valve 2-3-6, and the loading handle 2-3-7 is shaken up and down to apply a load until the load reaches a desired value; one end of each manual hydraulic pump is provided with the oil filling port 2-3-8, so that oil can be conveniently filled into the oil tank 2-3-9.
In the specific test, the method comprises the following steps:
the method comprises the following steps: putting a prepared mortar anchor rod 1-1 and rock sample 1-1-1 combined test piece into a corrosion test groove 1-3 through a U-shaped opening, sequentially passing the prepared anchor rod 1-8 test piece through anchor rod extension openings 1-3-1 and jack anchor rod extension openings 2-1-6 at two sides of the corrosion test groove 1-3 from right to left, fixedly connecting the corrosion test groove 1-3 with a jack 2-1 through a fastening nut 2-1-7, installing a base plate 1-6 and a lock 1-5 at the right end of the anchor rod extension, and installing a lock 1-5 at the left end of the anchor rod extension;
step two: checking whether the first sealing ring 1-4 and the second sealing ring 1-11 are installed or not, checking that the fastening nuts 1-12 are in a locked state, opening the corrosion-resistant non-metal cover 1-2 and the rubber plug 1-10, injecting a corrosive liquid into the rock sample corrosion tank and the corrosion test tube, and returning the corrosion-resistant non-metal cover 1-2 and the rubber plug 1-10 to the original positions after the limit water level is reached;
step three: checking that the oil quantity of the oil tank 2-3-9 is sufficient, enabling the pressure relief valve 2-3-6 and the locking valve 2-3-3 to be in an open state, enabling the rubber oil pipe 2-4 to be connected with the loading spiral connector 2-1-4, the oil inlet 2-3-4 and the oil outlet 2-3-1, enabling the jack 2-1 and the manual hydraulic pump 2-3 to be connected perfectly through the rubber oil pipe 2-4, pressing the loading handle 2-3-7 up and down to give an expected load to the jack 2-1, observing that the load of the first pressure gauge 2-3-2 reaches an expected value, closing the pressure relief valve 2-3-6 and the locking valve 2-3, and starting a test.
Step four: after the test is finished, photographing and recording the extending state of the piston rod 2-1-1, opening the pressure relief valve 2-3-6 and the locking valve 2-3-3, pressing the loading handle 2-3-7 up and down to enable the piston rod to return to the initial position and enable hydraulic oil to return to the oil tank, detaching the rubber oil pipe 2-4 and the anchorage device 1-5, taking down the corrosion test groove, pouring out the corrosion liquid, taking out the prepared rock sample, the anchor rod combined test piece and the anchor rod test piece, recording relevant data, and finishing the test.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. The utility model provides a stress corrosion test device of stock steel, includes corrosion test device module and stress loading device module, its characterized in that: the corrosion test device module comprises a mortar anchor rod, a rock sample, a corrosion-resistant non-metallic cover, a U-shaped opening stress corrosion test groove, a first sealing ring, a lockset, a base plate, a rubber cushion, an anchor rod, a stress corrosion test tube, a rubber plug, a second sealing ring and a fastening nut;
the number of the U-shaped opening stress corrosion test grooves is one, and the number of the stress corrosion test tubes is two;
the U-shaped port stress corrosion test groove and the two stress corrosion test pipes are connected with a stress loading device module;
the stress loading device module comprises a jack, a jack support base, a manual hydraulic pump and a rubber oil pipe;
the U-shaped opening stress corrosion test groove is fixedly connected with the jack through the fastening nut;
anchor rod extending openings are formed in two sides of the U-shaped opening stress corrosion test groove, and the mortar anchor rod is horizontally placed in the U-shaped opening rock corrosion test groove;
a rubber cushion is placed at the bottom of the U-shaped opening stress corrosion test groove, and the corrosion-resistant non-metal cover is placed on the U-shaped opening stress corrosion test groove;
the lock is used for locking and fixing the mortar anchor rod, and a rubber cushion is placed between the lock and the U-shaped opening stress corrosion test groove;
the contact part of the mortar anchor rod and the U-shaped opening stress corrosion test groove is sealed by the first sealing ring;
the anchor rod horizontally penetrates through an anchor rod extending port of the stress corrosion test tube; the contact part of the anchor rod and the stress corrosion test tube is sealed by the second sealing ring;
the jack is provided with two pressure spiral connectors, and the manual hydraulic pump is connected with the jack through a rubber oil pipe;
the jack is placed on the jack support base, and the piston rod is placed in the oil cylinder;
the spoke type pressure sensor is fixed between the piston rod and the ejector head.
2. The anchor rod steel stress corrosion test device of claim 1, characterized in that: and the upper side of the U-shaped port stress corrosion test groove is provided with an opening for injecting corrosive liquid.
3. The anchor rod steel stress corrosion test device of claim 1, characterized in that: the upper side of the stress corrosion test tube is provided with a corrosive liquid injection port and a rubber plug for injecting corrosive liquid.
4. The anchor rod steel stress corrosion test device according to claim 1, characterized in that: the manual hydraulic pump comprises an oil outlet and an oil inlet, and a first pressure gauge is arranged in front of the oil outlet and used for displaying the magnitude of applied pressure;
and a locking valve is arranged in front of the first pressure gauge and used for locking the applied pressure value.
5. The anchor rod steel stress corrosion test device according to claim 1, characterized in that: and a pressure relief valve is arranged in front of an oil inlet of each manual hydraulic pump, and a second pressure gauge is arranged above the oil inlet and used for displaying the output pressure during pressure relief.
6. The anchor rod steel stress corrosion test device of claim 5, characterized in that: and a loading handle is arranged on the horizontal right side of the pressure relief valve.
7. The anchor rod steel stress corrosion test device of claim 1, characterized in that: one end of each manual hydraulic pump is provided with an oil filling port.
8. The anchor rod steel stress corrosion test device of claim 1, characterized in that: the U-shaped port stress corrosion test groove and the stress corrosion test tube are made of corrosion-resistant non-metallic materials.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211356818.8A CN115683993A (en) | 2022-11-01 | 2022-11-01 | Stress corrosion test device of stock steel |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211356818.8A CN115683993A (en) | 2022-11-01 | 2022-11-01 | Stress corrosion test device of stock steel |
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| CN115683993A true CN115683993A (en) | 2023-02-03 |
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| CN202211356818.8A Pending CN115683993A (en) | 2022-11-01 | 2022-11-01 | Stress corrosion test device of stock steel |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115855787A (en) * | 2023-02-16 | 2023-03-28 | 北京科技大学 | Anchor rod corrosion resistance test device |
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| CN214174030U (en) * | 2021-01-15 | 2021-09-10 | 清华大学 | Steel constant-load stress corrosion test device under periodic infiltration condition |
| CN113640097A (en) * | 2021-07-29 | 2021-11-12 | 北京科技大学 | Constant-temperature stress corrosion device and test method for multi-anchor-body test piece |
-
2022
- 2022-11-01 CN CN202211356818.8A patent/CN115683993A/en active Pending
Patent Citations (7)
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|---|---|---|---|---|
| KR20140022304A (en) * | 2012-08-14 | 2014-02-24 | 주식회사 동평 | Using pc strand ground anchor and method for ground reinforcement using the same |
| CN109115677A (en) * | 2018-09-19 | 2019-01-01 | 长江水利委员会长江科学院 | Constant current cycle seepage environment lower prestress anchor pole corrosion test system and its test method |
| CN111537351A (en) * | 2020-06-28 | 2020-08-14 | 青岛理工大学 | Method for testing bearing performance of anchor rod under coupling action of load and erosion environment |
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| CN115855787A (en) * | 2023-02-16 | 2023-03-28 | 北京科技大学 | Anchor rod corrosion resistance test device |
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