CN112649352A - Device and method for testing salt spray corrosion resistance of steel wire in bending and stretching state - Google Patents
Device and method for testing salt spray corrosion resistance of steel wire in bending and stretching state Download PDFInfo
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- CN112649352A CN112649352A CN202011553933.5A CN202011553933A CN112649352A CN 112649352 A CN112649352 A CN 112649352A CN 202011553933 A CN202011553933 A CN 202011553933A CN 112649352 A CN112649352 A CN 112649352A
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- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
- G01N17/006—Investigating resistance of materials to the weather, to corrosion, or to light of metals
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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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Abstract
The invention relates to a device and a method for testing salt spray corrosion resistance of a steel wire in a bending and stretching state, and the device comprises a bottom plate (1), a top plate (2), a stress loading bolt (3), an arc plate (4), an anchor (6) and a stress sensor, wherein the top plate (2) is arranged above the bottom plate (1) in parallel, the arc plate (4) is fixed on the top plate (2), the steel wire is laid along the arc surface of the arc plate (4) in a bending way, two ends of the steel wire respectively downwards penetrate through wire penetrating through holes of the top plate (2) and the bottom plate (1), two ends of the steel wire are anchored at the bottom of the bottom plate (1) through the anchor (6), the stress loading bolt (3) is provided with a loading nut (7) and a self-locking nut (8), and is supported between the top plate (2) and the bottom plate (1) to load the bent steel wire, and the. The method simulates the load state of the steel wire at the cable shoe bending section by the suspension bridge air spinning method, and is used for evaluating the salt spray corrosion resistance of the steel wire at the cable saddle bending section.
Description
Technical Field
The invention relates to a steel wire detection device with salt spray corrosion resistance.
Background
The suspension bridge is one of the bridge types with the strongest spanning capability, and from the development of bridges in the world, the bridge develops towards the direction of spanning longer span, larger scale and spanning straits or open sea. At present, a suspension bridge scheme with a single span of 2000-3000 m is frequently generated in a collection scheme for planning large-scale cross-sea engineering. Meanwhile, the construction of the suspension bridge is also involved in the communication engineering of the mountain highway, and a new problem different from the construction of the suspension bridge on the river appears in the construction of the mountain suspension bridge, namely, the construction is limited by the terrain of the mountain, the effective construction site is insufficient, and a lot of large-scale equipment and bridge members cannot be transported into the field. The construction method commonly used at present for the main cable strand of the suspension bridge is a prefabricated parallel steel wire strand method. The cable strand is a traction unit and is bound into a main cable. Meanwhile, the main cable strand of the large-span suspension bridge is heavy, so that the requirement on traction equipment is high. Therefore, in order to meet the development requirements of the current industry, a novel construction method needs to be developed.
The air spinning method is a method of weaving a plurality of steel wires into a steel wire strand on a catwalk by taking the steel wires as a traction unit, and then binding a plurality of strands to form a main cable. In the air spinning process, endless steel wire is wound around a shoe to form a strand. The most significant feature of the air spinning method compared to the prefabricated parallel wire strand method is that the wires are bent at the shoe with a relatively small bending radius. Therefore, how the dynamic and static load bearing capacity of the bent steel wire changes needs to be further tested and researched. In addition, since the bending radius of the steel wire is small, whether the bending state affects the corrosion resistance of the steel wire or not needs to be tested by comparing the salt spray of the steel wire in the bending state with the salt spray of the steel wire in the straight state.
For the main cable strand of the air-laid method, the main cable is subjected to a large bending stress at a local position such as a cable shoe in addition to a tensile stress during the operation of the bridge. The traditional corrosion resistance test can not simulate the corrosion resistance of the steel wire under bending stress, so the durability evaluation of the high-strength steel wire still has certain limitation.
Disclosure of Invention
The invention aims to solve the technical problem of providing a salt spray corrosion resistance test device aiming at the prior art, which is used for testing the salt spray corrosion resistance of a bridge cable steel wire in the states of tensile stress and bending stress.
The technical scheme adopted by the invention for solving the problems is as follows: the utility model provides a device of anti salt spray corrosion performance of inspection steel wire under crooked tensioning state, includes bottom plate, roof, stress loading bolt, circular arc board, ground tackle, stress inductor, roof parallel arrangement is in the bottom plate top, the circular arc board is fixed to be set up on the roof, the both ends of roof and bottom plate set up the wire through-hole that corresponds from top to bottom respectively, and the steel wire is followed the circular arc surface of circular arc board is crooked to be laid, and the both ends of steel wire pass roof and bottom plate respectively downwards in proper order the wire through-hole, steel wire both ends rethread the ground tackle anchor is in the bottom plate bottom, stress loading bolt disposes loading nut and self-locking nut, stress loading bolt supports and is in give crooked steel wire loading tension between roof and the bottom plate, stress inductor sets up the tension that is used for responding to the steel wire with the steel wire cooperation.
Preferably, the roof plate further comprises a plurality of stiffening plates, the stiffening plates are arranged on the arc plates, and the stiffening plates are perpendicular to the roof plate.
Preferably, the stress loading bolt has two branches, and the two branches are symmetrically arranged between the top plate and the bottom plate and are used for uniformly loading the steel wires.
Preferably, the bottom surface of the top plate is provided with a bolt positioning counter bore, the bottom plate is provided with a bolt through bore, the top of the stress loading bolt correspondingly props against the bolt positioning counter bore, the bottom of the stress loading bolt penetrates through the bolt through bore, the self-locking nut is screwed at the upper end of the bolt through bore, and the loading nut is screwed at the lower end of the bolt through bore.
Preferably, the stress inductor is selected from strain gauges, and a plurality of strain gauges are attached to the steel wire; or the stress sensors are selected from two pressure sensors which are respectively arranged at two anchoring ends of the steel wire.
Preferably, the arc surface of the arc plate has a U-shaped cross section, and the steel wire is laid in the U-shaped groove of the arc surface, so as to react.
Preferably, the stiffening plate is disposed on an extension line of the stress loading bolt.
Preferably, the bottom end of the stiffening plate starts from the top plate, and the top end of the stiffening plate is lower than or higher than the arc surface of the arc plate or is flush with the arc surface, so as to divide the load on the arc plate.
Preferably, the anchorage device is provided with a central through hole for the steel wire to pass through, and an end pier head of the steel wire, the diameter of the pier head is larger than that of the central through hole, the anchorage device is used for realizing anchoring of two ends of the steel wire on the bottom, and the bottom of the bottom plate is provided with an anchorage device positioning counter bore which is matched with the anchorage device to be positioned and installed on the bottom of the bottom plate.
The method for testing the salt spray corrosion resistance of the steel wire in the bending and stretching state by adopting the device is operated as follows
Firstly, steel wires are bent and laid along the arc surface of an arc plate, two ends of each steel wire are reserved, the two ends of each steel wire penetrate through wire penetrating through holes in a top plate and a bottom plate in sequence, then penetrate through a central through hole of an anchorage device respectively, a steel wire tensioning length is reserved between the bottom plate and the top plate according to the length of a bolt, two ends of each steel wire are subjected to heading, the diameter of the heading is not less than 1.5 times of the diameter of each steel wire, the height of the heading is not less than 1 time of the diameter of each steel wire, and the steel wires are anchored on;
screwing a self-locking nut into the stress loading bolt, enabling the bottom of the stress loading bolt to penetrate through a bolt through hole in the bottom plate from top to bottom, screwing the bottom of the stress loading bolt into the loading nut, enabling the top of the stress loading bolt to correspondingly jack into a bolt positioning counter bore in the top plate, attaching a strain gauge on a steel wire between the bottom plate and the top plate or installing a pressure sensor between an anchorage device and the bottom plate, screwing the loading nut, loading the steel wire to 40-70% of nominal breaking load, and finally screwing the self-locking nut;
and step three, placing the test device loaded in the step two into a salt spray test box, and simultaneously manufacturing a plurality of test devices when a plurality of steel wires are tested to observe the corrosion condition of the steel wires at the bending section.
Compared with the prior art, the invention has the advantages that: the application develops a device for testing the salt spray corrosion resistance of a steel wire in a bending and stretching state, simulates the load state of a main cable steel wire at a bending section of a cable shoe in a suspension bridge air spinning method, and is used for evaluating the salt spray corrosion resistance of the steel wire at the bending section of a cable saddle.
Drawings
FIG. 1 is a schematic structural view of a test apparatus according to the present invention;
FIG. 2 is a cross-sectional view of the base plate of the present invention;
FIG. 3 is a top view of the base plate of the present invention;
FIG. 4 is a cross-sectional view of the top plate of the present invention;
FIG. 5 is a top view of the top plate of the present invention;
FIG. 6 is a schematic structural view of a stress loading bolt of the present invention;
FIG. 7 is a front view of the circular arc plate of the present invention;
FIG. 8 is a right side view of the circular arc plate of the present invention;
FIG. 9 is a cross-sectional view of an anchor according to the present invention;
FIG. 10 is an assembled view of a test apparatus of the present invention employing strain gauges as stress sensors;
FIG. 11 is an assembled view of a testing apparatus of the present invention employing a pressure sensor as a stress sensor;
FIG. 12 is a schematic illustration of a salt spray test of the test apparatus of the present invention;
in the figure: the stress loading device comprises a bottom plate 1, a top plate 2, a stress loading bolt 3, an arc plate 4, a stiffening plate 5, an anchorage 6, a loading nut 7, a self-locking nut 8, a strain gauge 9, a pressure sensor 10, a bolt through hole 101, a bolt positioning counter bore 201, a central through hole 601, a steel wire 11 and a wire through hole 102.
Detailed Description
The present invention will be described in further detail below with reference to the attached drawings, which are illustrative and are not to be construed as limiting the invention. The description of the present embodiment is corresponding to the accompanying drawings, and the description related to the orientation is also based on the description of the accompanying drawings, and should not be construed as limiting the scope of the present invention.
Example 1
The test device for testing the salt spray corrosion resistance of the steel wire in the bending and stretching state in the embodiment comprises a bottom plate 1, a top plate 2, a stress loading bolt 3, an arc plate 4, an anchorage device 6, a stress inductor such as a strain gauge 9 or a pressure sensor 10, and a loading nut 7 and a self-locking nut 8 which are configured on the stress loading bolt 3.
The circular arc plate 4 is made of a stainless steel plate with the thickness not less than 8 mm. The arc plate 4 is provided with three stiffening plates 5 on the surface, the end parts of the stiffening plates are welded with the bottom edge of the arc plate, the top of the arc surface at the top of the arc plate is in a plane shape or an inner arc shape, and the inner arc shape is preferred, so that an arc groove is formed on the arc surface of the arc plate, the groove width is consistent with the thickness of the arc plate 4, the steel wire is prevented from running out of the groove opening, the steel wire is enabled to be located in the central position all the time, and the steel wire is prevented from sliding. The stiffening plates 5 are stainless steel plates with the thickness of 5-10 mm, and the two stiffening plates correspond to the stress loading bolts 3 in position.
The stress loading bolt 3 is supported between the top plate 2 and the bottom plate 1 and used for loading tension on a bent steel wire, in the embodiment, the stress loading bolt 3 is provided with two branches, the top of the stress loading bolt 3 is abutted against the bolt positioning counter bore 201 of the top plate 2, the bottom of the stress loading bolt passes through the bolt through hole 101 of the bottom plate 1 from top to bottom, the self-locking nut 8 is screwed at the upper end of the bolt through hole 101, and the loading nut 7 is screwed at the lower end of the bolt through hole 101.
The stress inductor is arranged in cooperation with the steel wire 11 for inducing tension of the steel wire. The stress inductor can be a strain gauge 9, and a plurality of strain gauges 9 are attached to the steel wire; alternatively, two pressure sensors 10 may be used, each of the two pressure sensors 10 being arranged at each of the two anchoring ends of the steel wire, i.e. between the anchorage 6 and the base plate 1.
Example 2
The embodiment relates to an operation method for salt spray corrosion resistance of a steel wire in a bending and stretching state, which comprises the following steps:
firstly, steel wires 11 are laid along the arc surface of an arc plate 4 in a bending mode, the steel wires are laid in arc grooves, two ends of each steel wire are reserved symmetrically, the two ends of each steel wire penetrate through wire penetrating through holes in a top plate 2 and a bottom plate 1 in sequence, then the two ends of each steel wire penetrate through a central through hole of an anchorage device 6 respectively, steel wire stretching length is reserved between the bottom plate 1 and the top plate 2 according to bolt length, two ends of each steel wire are subjected to heading, the diameter of each heading is not less than 1.5 times of the diameter of each steel wire, the height of each heading is not less than 1 time of the diameter of each steel wire, and the anchorage devices.
Step two, screwing the self-locking nut 8 into the thread at the lower end of the stress loading bolt 3, penetrating the bolt perforation 101 on the bottom plate 1 from the top to the bottom of the stress loading bolt 3, screwing the loading nut 7 into the bottom, correspondingly jacking the top of the stress loading bolt 3 into the bolt positioning counter bore 201 on the top plate 2, pasting the strain gauge 9 on the steel wire between the bottom plate 1 and the top plate 2, pasting the strain gauge 9 on the steel wire at the top of the arc plate 4, screwing the loading nut 7, enabling the upper end and the lower end of the stress loading bolt 3 to prop the top 2 and the bottom plate 1, thereby loading tension on the steel wire, loading the steel wire 11 to 40-70% of nominal breaking load until the steel wire is loaded, screwing the self-locking nut 8 at last, enabling the steel wire to keep a loaded state: the stress loading bolt 3 is vertical to the top plate 2 and the bottom plate 1.
And step three, placing the test device loaded in the step two into a salt spray test box, and observing the corrosion condition of the steel wire at the bending section.
In addition to the above embodiments, the present invention also includes other embodiments, and any technical solutions formed by equivalent transformation or equivalent replacement should fall within the scope of the claims of the present invention.
Claims (10)
1. The utility model provides a device of anti salt spray corrosion performance of inspection steel wire under crooked tensioning condition which characterized in that: the steel wire tension device comprises a bottom plate (1), a top plate (2), a stress loading bolt (3), an arc plate (4), an anchor (6) and a stress inductor, wherein the top plate (2) is arranged above the bottom plate (1) in parallel, the arc plate (4) is fixedly arranged on the top plate (2), two ends of the top plate (2) and the bottom plate (1) are respectively provided with wire penetrating through holes which correspond up and down, steel wires are laid along the arc surface of the arc plate (4) in a bending way, two ends of the steel wires respectively penetrate through the wire penetrating through holes of the top plate (2) and the bottom plate (1) downwards in sequence, two ends of the steel wires are anchored at the bottom of the bottom plate (1) through the anchor (6), the stress loading bolt (3) is provided with a loading nut (7) and a self-locking nut (8), the stress loading bolt (3) is supported between the top plate (2) and the bottom plate (1) to load, the stress inductor is matched with the steel wire and used for inducing the tension of the steel wire.
2. The apparatus for testing the salt spray corrosion resistance of a steel wire in a bent tensioned state according to claim 1, wherein: the novel roof plate is characterized by further comprising a plurality of stiffening plates (5), wherein the stiffening plates (5) are arranged on the arc plates (4), and the stiffening plates (5) are perpendicular to the roof plate (2).
3. The apparatus for testing the salt spray corrosion resistance of a steel wire in a bent tensioned state according to claim 2, wherein: the stress loading bolts (3) are provided with two branches which are symmetrically arranged between the top plate (2) and the bottom plate (1).
4. The apparatus for testing the salt spray corrosion resistance of a steel wire in a bent tensioned state according to claim 1, wherein: the bottom surface of the top plate (2) is provided with a bolt positioning counter bore (201), the bottom plate (1) is provided with a bolt through hole (101), the top of the stress loading bolt (3) correspondingly props against the inside of the bolt positioning counter bore (201), the bottom of the stress loading bolt penetrates through the bolt through hole (101), the self-locking nut (8) is screwed at the upper end of the bolt through hole (101), and the loading nut (7) is screwed at the lower end of the bolt through hole (101).
5. The apparatus for testing the salt spray corrosion resistance of a steel wire in a bent tensioned state according to claim 1, wherein: the stress inductor is selected from strain gauges (9), and a plurality of strain gauges (9) are attached to the steel wire; or the stress sensors are selected from pressure sensors (10), and two pressure sensors (10) are respectively arranged at two anchoring ends of the steel wire.
6. The apparatus for testing the salt spray corrosion resistance of a steel wire in a bent tensioned state according to claim 1, wherein: the arc surface of the arc plate (4) is provided with a U-shaped section, and the steel wire is laid in a U-shaped groove of the arc surface.
7. The apparatus for testing the salt spray corrosion resistance of a steel wire in a bent tensioned state according to claim 2, wherein: and the stiffening plate (5) is arranged on the extension line of the stress loading bolt (3).
8. The apparatus for testing the salt spray corrosion resistance of a steel wire in a bent tensioned state according to claim 2, wherein: the bottom end of the stiffening plate (5) starts from the top plate (2), and the top end is lower than or higher than the arc surface of the arc plate or is flush with the arc surface.
9. The apparatus for testing the salt spray corrosion resistance of a steel wire in a bent tensioned state according to claim 1, wherein: the anchorage device (6) is provided with a central through hole (601) for the steel wire to pass through, the end part of the steel wire is provided with a pier head, the diameter of the pier head is larger than that of the central through hole (601), and the bottom surface of the bottom plate (1) is provided with an anchorage device positioning counter bore.
10. A method for testing the salt spray corrosion resistance of a steel wire in a bending tension state by using the device of claims 1-9, which is characterized in that: comprises that
Firstly, steel wires are bent and laid along the arc surface of an arc plate (4) and two ends of the steel wires are reserved, the two ends of the steel wires penetrate through wire penetrating through holes in a top plate (2) and a bottom plate (1) in sequence and then penetrate through a central through hole of an anchorage device (6), the steel wire tensioning length is reserved between the bottom plate (1) and the top plate (2) according to the bolt length, two ends of the steel wires are subjected to heading, the diameter of the heading is not less than 1.5 times of the diameter of the steel wires, and the height of the heading is not less than 1 time of the diameter of the steel wires;
screwing a self-locking nut (8) into the stress loading bolt (3), enabling the bottom of the stress loading bolt (3) to penetrate through a bolt through hole (101) in the bottom plate (1) from top to bottom, screwing the loading nut (7) into the bottom, correspondingly jacking the top of the stress loading bolt into a bolt positioning counter bore (201) in the top plate (2), attaching a strain gauge (9) to a steel wire between the bottom plate (1) and the top plate (2) or installing a pressure sensor (10) between an anchorage device (6) and the bottom plate (1), screwing the loading nut (7), loading the steel wire to 40-70% of nominal breaking load, and finally screwing the self-locking nut (8);
and step three, placing the test device loaded in the step two into a salt spray test box, and simultaneously manufacturing a plurality of test devices when a plurality of steel wires are tested to observe the corrosion condition of the steel wires at the bending section.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011553933.5A CN112649352A (en) | 2020-12-24 | 2020-12-24 | Device and method for testing salt spray corrosion resistance of steel wire in bending and stretching state |
| PCT/CN2021/130497 WO2022134931A1 (en) | 2020-12-24 | 2021-11-15 | Apparatus and method for testing salt spray corrosion resistance of steel wire in bent and tensioned state |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011553933.5A CN112649352A (en) | 2020-12-24 | 2020-12-24 | Device and method for testing salt spray corrosion resistance of steel wire in bending and stretching state |
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| CN112649352A true CN112649352A (en) | 2021-04-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011553933.5A Pending CN112649352A (en) | 2020-12-24 | 2020-12-24 | Device and method for testing salt spray corrosion resistance of steel wire in bending and stretching state |
Country Status (2)
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| CN (1) | CN112649352A (en) |
| WO (1) | WO2022134931A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022134931A1 (en) * | 2020-12-24 | 2022-06-30 | 江苏东纲金属制品有限公司 | Apparatus and method for testing salt spray corrosion resistance of steel wire in bent and tensioned state |
| CN114905442A (en) * | 2022-06-21 | 2022-08-16 | 哈尔滨工业大学 | Special fixture for loading and positioning high-strength steel wire |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013217829A (en) * | 2012-04-11 | 2013-10-24 | Nippon Steel & Sumitomo Metal | Bending test device and bending test method using the same |
| CN103969176A (en) * | 2014-05-21 | 2014-08-06 | 中国船舶重工集团公司第七二五研究所青岛分部 | Method for testing seawater corrosion of low-alloy steel under stress state |
| CN105716944A (en) * | 2014-11-30 | 2016-06-29 | 中国科学院金属研究所 | Device and method for bending crossbeam stress corrosion test |
| CN204495692U (en) * | 2014-12-26 | 2015-07-22 | 大连理工大学 | Consider corrosion testing apparatus and the constant temperature experiments supporting device of bending stress impact |
| CN206311479U (en) * | 2016-11-30 | 2017-07-07 | 武汉钢铁股份有限公司 | Thin plate sample adds bending apparatus in a kind of salt spray test chamber |
| CN112649352A (en) * | 2020-12-24 | 2021-04-13 | 江苏东纲金属制品有限公司 | Device and method for testing salt spray corrosion resistance of steel wire in bending and stretching state |
| CN214201122U (en) * | 2020-12-24 | 2021-09-14 | 江苏东纲金属制品有限公司 | Device for testing salt spray corrosion resistance of steel wire in bending and stretching state |
-
2020
- 2020-12-24 CN CN202011553933.5A patent/CN112649352A/en active Pending
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2021
- 2021-11-15 WO PCT/CN2021/130497 patent/WO2022134931A1/en active Application Filing
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022134931A1 (en) * | 2020-12-24 | 2022-06-30 | 江苏东纲金属制品有限公司 | Apparatus and method for testing salt spray corrosion resistance of steel wire in bent and tensioned state |
| CN114905442A (en) * | 2022-06-21 | 2022-08-16 | 哈尔滨工业大学 | Special fixture for loading and positioning high-strength steel wire |
| CN114905442B (en) * | 2022-06-21 | 2024-01-30 | 哈尔滨工业大学 | Special fixture for loading and positioning high-strength steel wire |
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| Publication number | Publication date |
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| WO2022134931A1 (en) | 2022-06-30 |
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