Movable steel bundle accelerated corrosion test device in force holding state

Abstract

The utility model discloses a movable type steel bundle accelerated corrosion test device in a force holding state, which belongs to the technical field of bridge engineering steel wire or steel strand accelerated corrosion tests and comprises a steel structure supporting unit, and the steel structure supporting unit is hollow and is used for placing a steel bundle; the two anchor bearing plates are arranged at the two ends of the steel structure supporting unit respectively and connected with the ends of the steel structure supporting unit to form a cage-shaped main body; and the anchoring unit is connected and matched with the anchor bearing plate so as to anchor the steel beam arranged in the steel structure supporting unit. The device is simple in structure, low in cost and small in size, has the advantages of being capable of moving at will, and is suitable for a steel beam corrosion test in a salt spray box in a force holding state.

Description

Technical Field

[0001] This utility model belongs to the technical field of accelerated corrosion testing of steel wires or steel strands in bridge engineering, and specifically relates to a mobile accelerated corrosion testing device for steel strands under load. Background Technology

[0002] With the increasing demand for a strong transportation network in my country, more and more cross-river and cross-sea bridges, as well as long-span cable-stayed bridges spanning deep canyons, are being constructed. Corrosion of the steel wires or strands is one of the main factors affecting the safety and lifespan of cable-stayed bridge structures. The corrosion resistance of the cable system, as a major load-bearing component, is a hot topic of concern in the industry. Therefore, sufficient research is needed on the corrosion patterns and post-corrosion strength of parallel steel wires and strands.

[0003] There is currently limited research on the corrosion of parallel steel wires or strands under load. Corrosion test devices under load are mostly single-wire tensioning devices fixed to the ground, and the test methods mostly involve immersing the steel wire in a corrosive solution tank. There are no devices suitable for salt spray chambers. Utility Model Content

[0004] To solve the above problems, the present invention adopts the following technical solution:

[0005] A portable, stress-bearing accelerated corrosion testing device for steel strands includes:

[0006] A steel structure support unit, wherein the interior of the steel structure support unit is hollow to accommodate steel strands;

[0007] Two anchor plates are respectively disposed at both ends of the steel structure support unit and connected to the ends of the steel structure support unit to form a cage-like main body;

[0008] An anchoring unit, which is connected and cooperates with the anchor plate to anchor the steel strands installed in the steel structure support unit.

[0009] Furthermore, the steel structure support unit includes multiple first lacing bars, multiple second lacing bars, and multiple hot-rolled steel sections; the multiple hot-rolled steel sections are evenly arranged along the circumferential direction of the anchor plate and are disposed between two anchor plates, and the two ends of the hot-rolled steel sections are respectively connected to the two anchor plates to form a cuboid steel strand receiving cavity; the multiple first lacing bars are spaced apart on the outer end faces of two adjacent hot-rolled steel sections; the two ends of the length direction of the first lacing bars are respectively connected to the outer end faces of two adjacent hot-rolled steel sections; the multiple second lacing bars are disposed between two adjacent first lacing bars, and the two ends of the length direction of the second lacing bars are respectively connected to the outer end faces of two adjacent hot-rolled steel sections.

[0010] Furthermore, the extension direction of the first lacing strip is perpendicular to the length direction of the hot-rolled steel section; adjacent second lacing strips are arranged at an angle relative to each other, and the included angle between each pair of adjacent second lacing strips is the same.

[0011] Furthermore, the surfaces of the anchor plate, the first lacing strip, the second lacing strip, the hot-rolled steel section, the anchoring unit, and the end of the steel strand near the anchor plate are all coated with an anti-corrosion coating.

[0012] Furthermore, the steel structure support unit includes multiple gusset plates and multiple hot-rolled steel sections; the multiple hot-rolled steel sections are evenly arranged along the circumferential direction of the anchor plate and are arranged between two anchor plates, and the two ends of the hot-rolled steel sections are respectively connected to the two anchor plates to form a cuboid steel strand receiving cavity; the multiple gusset plates are evenly arranged on the outer end faces of two adjacent hot-rolled steel sections, and the two ends of the length direction of the gusset plates are respectively connected to the two adjacent hot-rolled steel sections.

[0013] Furthermore, the plurality of the lacing plates are arranged parallel to each other and spaced apart, and the extension direction of the lacing plates is perpendicular to the length direction of the hot-rolled steel section.

[0014] Furthermore, both the surface of the gusset plate and the surface of the hot-rolled steel section are coated with an anti-corrosion coating.

[0015] Beneficial effects:

[0016] This utility model provides a mobile, under-stressed accelerated corrosion testing device for steel strands. It has the advantages of low cost, small size and easy mobility. It is suitable for under-stressed corrosion testing of steel strands in a salt spray chamber. The main body is composed of anchor plates and steel structure supports. It has a simple structure and a porous structure that allows salt spray to enter its interior, ensuring that the corrosion of the internal steel strands is not hindered. This device is not limited to corrosion testing of a single steel wire, but can anchor parallel steel strands. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the mobile steel strand accelerated corrosion test device under load in Example 1;

[0018] Figure 2 This is a schematic diagram of the overall structure of the mobile steel strand accelerated corrosion test device under load in Example 1 without the steel strands installed.

[0019] Figure 3 This is a side sectional view of the movable steel strand accelerated corrosion test device under load in Example 1;

[0020] Figure 4 This is a schematic diagram of the installation step S1 in Example 2;

[0021] Figure 5 This is a structural schematic diagram of installation step S2 in Example 2;

[0022] Figure 6 This is a structural schematic diagram of installation step S3 in Example 2;

[0023] Figure 7 This is a schematic diagram of the installation step S4 in Example 2;

[0024] Figure 8 This is a schematic diagram of the installation step S5 in Example 2;

[0025] Figure 9 This is a schematic diagram of the overall structure of the mobile steel strand accelerated corrosion test device under load in Example 3, without the steel strands installed.

[0026] Figure 10 This is a side view of the mobile, load-bearing-condition accelerated corrosion test apparatus for steel strands without steel strands installed, as described in Example 3.

[0027] Among them, 1. Anchoring unit; 2. Anchor plate; 3. First lacing strip; 4. Second lacing strip; 5. Lacing plate; 6. Hot-rolled steel section; 7. Steel strand. Detailed Implementation

[0028] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0029] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "horizontal," "inner," "outer," and "one side," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0030] Example 1

[0031] like Figures 1 to 3As shown, a mobile accelerated corrosion testing device for steel strands under stress conditions includes:

[0032] Steel structure support unit, the interior of the steel structure support unit is hollow to accommodate steel strands 7;

[0033] Two anchor plates 2 are respectively set at both ends of the steel structure support unit and connected to the ends of the steel structure support unit to form a cage-like main body. The porous structure of the cage-like main body allows salt spray in the salt spray chamber to enter its interior, ensuring that the corrosion of the internal steel strand 7 is not hindered.

[0034] Anchoring unit 1 is connected and cooperates with anchor plate 2 to anchor the steel strand 7 set in the steel structure support unit.

[0035] The selection of anchoring unit 1 is not limited. It can be a general clamp-type self-locking anchoring unit 1, a pier head anchor, a squeeze anchor, etc., as long as the prestress applied to the steel strand 7 is accurate and does not lose its value within a certain period of time.

[0036] Among them, the anchor plate 2 is made of a thick steel plate and has multiple openings for inserting the steel strands 7, and its surface is treated with anti-corrosion.

[0037] Among them, steel strand 7 is a steel wire bundle or steel strand to be tensioned for prestressing and accelerated corrosion testing.

[0038] Through the above technical solution, a frame that can withstand the reaction pressure of the tensioned steel strand 7 is formed by combining the steel structure support unit and the anchor plate 2. While having sufficient load-bearing capacity, the porous structure of the device allows salt spray to enter its interior, ensuring that the corrosion of the internal steel strand 7 is not hindered.

[0039] In this embodiment, the steel structure support unit includes multiple first lacing strips 3, multiple second lacing strips 4, and multiple hot-rolled steel sections 6; the multiple hot-rolled steel sections 6 are evenly arranged along the circumferential direction of the anchor plate 2 and are arranged between two anchor plates 2, and the two ends of the hot-rolled steel sections 6 are respectively connected to the two anchor plates 2 to form a cuboid steel bundle 7 receiving cavity; the multiple first lacing strips 3 are spaced apart on the outer end faces of two adjacent hot-rolled steel sections 6; the two ends of the length direction of the first lacing strips 3 are respectively connected to the outer end faces of two adjacent hot-rolled steel sections 6; the multiple second lacing strips 4 are arranged between two adjacent first lacing strips 3, and the two ends of the length direction of the second lacing strips 4 are respectively connected to the outer end faces of two adjacent hot-rolled steel sections 6.

[0040] Preferably, the multiple first lacing strips 3, multiple second lacing strips 4, and hot-rolled steel sections 6 are connected by welding.

[0041] In this embodiment, the extension direction of the first lacing strip 3 is perpendicular to the length direction of the hot-rolled steel section 6; two adjacent second lacing strips 4 are arranged at an angle relative to each other, and the included angle between each pair of adjacent second lacing strips 4 is the same.

[0042] The selection of hot-rolled steel section 6 is not restricted, and channel steel, angle steel, etc. can be used; in order to obtain better symmetry and improve the stability of the section in all directions, equilateral angle steel can be used.

[0043] The two ends of the first lacing strip 3 and the two ends of the second lacing strip 4 are welded to the hot-rolled steel section 6 respectively. The cross-sectional feature is that the hot-rolled steel section 6 occupies the four right angles of the cross-section square. The hot-rolled steel sections 6 are connected to each other through the first lacing strip 3 and the second lacing strip 4 to form a four-limb lattice cross-section. The welding form of the first lacing strip 3 to the hot-rolled steel section 6 and the welding form of the second lacing strip 4 to the hot-rolled steel section 6 are similar to those of a truss. Each second lacing strip 4 forms an angle α (preferably 90 degrees) with its adjacent second lacing strip 4, in which case the second lacing strip 4 is set at an inclination of 45 degrees.

[0044] Through the above technical solution, multiple first lacing bars 3, multiple second lacing bars 4, and hot-rolled steel sections 6 are connected to form a cage-like porous structure, which allows salt spray in the salt spray chamber to enter its interior, ensuring that the corrosion of the internal steel strands 7 is not hindered.

[0045] In this embodiment, the surfaces of the anchor plate 2, the first lacing strip 3, the second lacing strip 4, the hot-rolled steel 6, the anchoring unit 1, and the end of the steel bundle 7 near the anchor plate 2 are all coated with an anti-corrosion coating.

[0046] Through the above technical solution, the surface of the anchor plate 2, the surface of the first lacing strip 3, the surface of the second lacing strip 4, the surface of the hot-rolled steel 6, the surface of the anchoring unit 1, and the end of the steel strand 7 near the anchor plate 2 are all coated with a layer of anti-corrosion coating to ensure that only the steel strand 7 inside the device is severely corroded during the accelerated corrosion test, thereby ensuring the safety of the device.

[0047] Example 2

[0048] like Figures 4 to 8 As shown, this embodiment is the installation method of the movable steel strand accelerated corrosion test device under load in Embodiment 1. The method includes the following steps:

[0049] S1. Four hot-rolled steel sections 6 are welded to the first anchor plate 2 respectively. The cross-sectional feature is that the hot-rolled steel sections 6 occupy the four right angles of the cross-sectional square respectively.

[0050] S2 and hot-rolled steel sections 6 are connected in pairs by alternating first lacing strips 3 and second lacing strips 4 to form a four-limb lattice section;

[0051] S3, the first lacing strip 3 and the second lacing strip 4 are welded alternately from one end near the first anchor plate 2. The first lacing strip 3 is placed parallel at certain intervals and welded to the hot-rolled steel section 6. The second lacing strip 4 is placed between two adjacent first lacing strips 3. Each second lacing strip 4 is inclined at 45 degrees and forms a 90-degree angle with the previous adjacent second lacing strip 4. When the first lacing strip 3 and the second lacing strip 4 are alternately welded to the middle of the hot-rolled steel section 6, the second anchor plate 2 is welded to the other end of the hot-rolled steel section 6.

[0052] S4. Continue to alternately weld the first lacing bar 3 and the second lacing bar 4 in sequence to ensure reliable connection between the hot-rolled steel sections 6, forming the main body of the cage-shaped movable steel strand accelerated corrosion test device under load.

[0053] S5. Install steel strand 7. The steel strand 7 passes through the main body of the device. After applying prestress through a certain method, it is anchored using anchoring unit 1.

[0054] Example 3

[0055] This embodiment is based on Embodiment 1, with the following differences: Figures 9 to 10 As shown, the steel structure support unit includes multiple gusset plates 5 and multiple hot-rolled steel sections 6; the multiple hot-rolled steel sections 6 are evenly arranged along the circumferential direction of the anchor plate 2 and are arranged between two anchor plates 2, and the two ends of the hot-rolled steel sections 6 are respectively connected to the two anchor plates 2 to form a cuboid steel bundle 7 receiving cavity; the multiple gusset plates 5 are evenly arranged on the outer end faces of two adjacent hot-rolled steel sections 6, and the two ends of the length direction of the gusset plates 5 are respectively connected to the two adjacent hot-rolled steel sections 6.

[0056] In this embodiment, multiple gusset plates 5 are arranged parallel to each other and spaced apart, and the extension direction of the gusset plates 5 is perpendicular to the length direction of the hot-rolled steel section 6.

[0057] In this embodiment, both the surface of the gusset plate 5 and the surface of the hot-rolled steel section 6 are coated with an anti-corrosion coating.

[0058] Among them, the surface of the anchor plate 2, the surface of the gusset plate 5, the surface of the hot-rolled steel 6, the surface of the anchoring unit 1, and the end of the steel bundle 7 near the anchor plate 2 are all coated with a layer of anti-corrosion coating.

[0059] Through the above technical solution, the surface of the anchor plate 2, the surface of the gusset plate 5, the surface of the hot-rolled steel 6, the surface of the anchoring unit 1, and the end of the steel strand 7 near the anchor plate 2 are all coated with a layer of anti-corrosion coating to ensure that only the steel strand 7 inside the device is severely corroded during the accelerated corrosion test, thereby ensuring the safety of the device.

[0060] The installation steps of the movable steel strand accelerated corrosion testing device under load provided by this utility model are as follows:

[0061] S1. Four hot-rolled steel sections 6 are welded to the first anchor plate 2 respectively. The cross-sectional feature is that the hot-rolled steel sections 6 occupy the four right angles of the cross-sectional square respectively.

[0062] S2 and hot-rolled steel sections 6 are connected in pairs by spaced and parallel gusset plates 5 to form a four-limb lattice section.

[0063] S3. Welding of the gusset plate 5 begins from one end near the first anchor plate 2. When welding to the middle of the hot-rolled steel section 6, the second anchor plate 2 is welded to the other end of the hot-rolled steel section 6.

[0064] S4. Continue welding the lacing plates 5 to ensure reliable connection between the hot-rolled steel sections 6, forming the main body of the cage-like movable steel strand accelerated corrosion test device under load.

[0065] S5. Install steel strand 7. The steel strand 7 passes through the main body of the device. After applying prestress through a certain method, it is anchored using anchoring unit 1.

[0066] The above are merely preferred embodiments of the present utility model and do not constitute any limitation on the technical scope of the present utility model. Therefore, any minor modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model shall still fall within the scope of the technical solution of the present utility model.

Claims

1. A movable, load-bearing-stress accelerated corrosion testing device for steel strands, characterized in that, include: A steel structure support unit, wherein the interior of the steel structure support unit is hollow to accommodate steel strands; Two anchor plates are respectively disposed at both ends of the steel structure support unit and connected to the ends of the steel structure support unit to form a cage-like main body; An anchoring unit, which is connected and cooperates with the anchor plate to anchor the steel strands installed in the steel structure support unit.

2. The mobile, force-bearing accelerated corrosion testing device for steel strands according to claim 1, characterized in that, The steel structure support unit includes multiple first lacing bars, multiple second lacing bars, and multiple hot-rolled steel sections. The multiple hot-rolled steel sections are evenly arranged along the circumferential direction of the anchor plates and positioned between two anchor plates, with both ends of each hot-rolled steel section connected to the two anchor plates respectively, to enclose a cuboid-shaped steel strand receiving cavity. Multiple first lacing bars are spaced apart on the outer end faces of adjacent hot-rolled steel sections; both ends of the length direction of each first lacing bar are connected to the outer end faces of the two adjacent hot-rolled steel sections respectively. Multiple second lacing bars are positioned between adjacent first lacing bars, with both ends of the length direction of each second lacing bar connected to the outer end faces of the two adjacent hot-rolled steel sections respectively.

3. The mobile, force-bearing-condition accelerated corrosion testing device for steel strands according to claim 2, characterized in that, The extension direction of the first lacing strip is perpendicular to the length direction of the hot-rolled steel section; two adjacent second lacing strips are arranged at an angle relative to each other, and the included angle between each pair of adjacent second lacing strips is the same.

4. The mobile, force-bearing-condition accelerated corrosion testing device for steel strands according to claim 2, characterized in that, The surfaces of the anchor plate, the first lacing strip, the second lacing strip, the hot-rolled steel section, the anchoring unit, and the end of the steel strand near the anchor plate are all coated with an anti-corrosion coating.

5. The mobile, force-bearing accelerated corrosion testing device for steel strands according to claim 1, characterized in that, The steel structure support unit includes multiple gusset plates and multiple hot-rolled steel sections; the multiple hot-rolled steel sections are evenly arranged along the circumferential direction of the anchor plate and are arranged between two anchor plates, and the two ends of the hot-rolled steel sections are respectively connected to the two anchor plates to form a cuboid steel strand receiving cavity; the multiple gusset plates are evenly arranged on the outer end faces of two adjacent hot-rolled steel sections, and the two ends of the length direction of the gusset plates are respectively connected to the two adjacent hot-rolled steel sections.

6. The mobile, force-bearing accelerated corrosion testing device for steel strands according to claim 5, characterized in that, The multiple gusset plates are arranged parallel to each other and spaced apart, and the extension direction of the gusset plates is perpendicular to the length direction of the hot-rolled steel section.

7. The mobile, force-bearing accelerated corrosion testing device for steel strands according to claim 5, characterized in that, Both the surface of the gusset plate and the surface of the hot-rolled steel section are coated with an anti-corrosion coating.

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