Environment creep coupling device of fiber reinforced composite rib anchoring system

Abstract

The utility model relates to a fiber reinforced composite rib anchoring system environment creep coupling device which comprises a creep relaxation device and an environment simulation device, cross beams are arranged up and down, the ends of the cross beams are connected through a connecting plate, the other end of the upper cross beam is connected with an upper loading plate through a positioning plate, a pressure testing ring is installed on the upper loading plate, and the upper cross beam is further connected with a stand column. The stand column is connected with the ground through a bottom beam, a lower loading plate is connected to the bottom beam and is opposite to the upper loading plate, one end, close to the stand column, of the lower cross beam is connected with a counterweight platform, and the other end of the lower cross beam is connected with the bottom beam through a positioning screw rod; the environment simulation device is arranged below the lower loading plate and comprises a heat insulation water tank, a counter-force frame, a heating partition plate and a heat source. According to the device, the creep performance of the FRP rib anchoring system serves as a durability inspection standard, relative slippage of the anchoring system in various environments is compared, the damage degree of various environmental factors to the performance of the anchoring system is quantified, the safe service life of the anchoring system in the same environment is predicted, and the device has good practicability.

Description

Technical Field

[0001] The present application relates to the technical field of novel composite materials, and in particular to an environmental creep coupling device for a fiber-reinforced composite tendon anchoring system. Background Art

[0002] Fiber reinforced polymer (FRP) has good mechanical properties, corrosion resistance, fatigue resistance, light weight and high strength, and has become an ideal material to replace traditional steel cables in the development of modern large-span cable-bearing bridges. Its application in bridge construction is gradually becoming more widespread. However, due to the anisotropic material properties of FRP bars, how to reliably anchor them has become an urgent problem to be solved.

[0003] At present, based on the research on the static performance of FRP bar composite anchoring system, attempts are made to analyze its environmental performance through experiments. However, it is difficult for the laboratory to truly simulate the working conditions of fiber reinforced bars in high temperature and high humidity environments. The existing durability tests in wet heat and chloride salt environments are mainly carried out in the form of separate environmental erosion and long-term stress tests, which do not fully simulate the actual service conditions of components. Utility Model Content

[0004] In order to solve or partially solve the problems existing in the related art, the present application provides an environmental creep coupling device for a fiber reinforced composite tendon anchoring system to realize durability tests in different environments and meet the test requirements of creep and environmental erosion coupling of the FRP anchoring system.

[0005] The first aspect of the present application provides an environmental creep coupling device for a fiber reinforced composite tendon anchoring system, comprising:

[0006] The creep relaxation device comprises a crossbeam, a column, a bottom beam, a counterweight platform, a positioning screw, a positioning plate, an upper loading plate, a lower loading plate and a pressure test ring. The crossbeam is arranged up and down and the ends are connected by a connecting plate. The other end of the upper crossbeam is connected to the upper loading plate through the positioning plate. The pressure test ring is installed on the upper loading plate. The upper crossbeam is also connected to the column. The column is connected to the ground through the bottom beam. The bottom beam is connected to the lower loading plate and the lower loading plate is arranged opposite to the upper loading plate. The lower crossbeam is connected to the counterweight platform at one end close to the column, and the other end is connected to the bottom beam through the positioning screw.

[0007] The environmental simulation device is arranged under the lower load plate, and comprises an insulating water tank and a reaction frame, a heating partition and a heat source arranged inside the tank. The reaction frame is connected under the lower load plate, and the heating partition isolates the heat source from the FRP tendon anchoring system.

[0008] Furthermore, the positioning plate is connected to the upper loading plate at the bottom thereof through four threaded steel columns, and the bottom beam is connected to the lower loading plate at the top thereof through four threaded steel columns.

[0009] Furthermore, the upper cross beam is connected to the column via a hinge support.

[0010] Furthermore, the right end of the upper crossbeam is hinged to the right end bolt shaft of the lower crossbeam through a connecting plate, and the left end of the upper crossbeam is hinged to the positioning plate bolt shaft through a U-shaped connecting plate.

[0011] Furthermore, one end of the FRP tendon anchoring system is connected to the pressure test ring, and the other end is placed in the environmental simulation device.

[0012] The technical solution provided by this application may have the following beneficial effects:

[0013] The present application provides an environmental creep coupling device for a fiber reinforced composite tendon anchoring system. The creep relaxation device utilizes the double lever principle to add a certain number of counterweights in the counterweight mechanism, and provides a persistent and constant load for the entire FRP tendon anchoring system through the double lever amplification effect of the upper beam and the lower beam. The environmental simulation device separates the erosion environment from the heating environment. The device simultaneously meets the test requirements for the creep and environmental erosion coupling of the FRP anchoring system, and has the characteristics of highly simulating the actual service conditions of the structure and high loading efficiency. The creep performance of the FRP tendon anchoring system is used as the durability test standard, and the relative slip of the FRP tendon and the anchoring system under environmental coupling and room temperature and dry environment is compared to quantify the degree of damage to the performance of the anchoring system caused by various environmental factors and predict the safe service life of the anchoring system under the same environment, which has good practicality.

[0014] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The above and other objects, features and advantages of the present application will become more apparent through a more detailed description of exemplary embodiments of the present application in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the present application.

[0016] Figure 1 It is a schematic diagram of the structure of the device shown in the embodiment of the present application;

[0017] Figure 2 is a schematic diagram of the structure of an environment simulation device shown in an embodiment of the present application;

[0018] Figure 3 It is a schematic diagram of the installation structure of the FRP tendon anchor system shown in the embodiment of the present application;

[0019] Figure 4 It is a structural schematic diagram of the FRP tendon anchor system shown in an embodiment of the present application;

[0020] Reference numerals:

[0021] In the figure, upper crossbeam-1, lower crossbeam-2, column-3, left bottom beam-4, right bottom beam-5, hinge support-6, upper crossbeam U-shaped connecting plate-7, lower crossbeam U-shaped connecting plate-8, connecting plate-9, counterweight platform-10, adjustment screw-11, positioning plate-12, upper loading plate-13, lower loading plate-14, pressure test ring-15, FRP tendon anchoring system-16, nut-161, environmental simulation device-17, reaction frame-171, insulated water tank-172, heating partition-173, heat source-174, aluminum sheet extensometer-18, U-shaped extensometer-19. DETAILED DESCRIPTION

[0022] The embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although the embodiments of the present application are shown in the accompanying drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to make the present application more thorough and complete, and to fully convey the scope of the present application to those skilled in the art.

[0023] It should be understood that although the terms "first", "second", "third", etc. may be used in this application to describe various information, this information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of this application, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0024] In the description of the present application, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0025] Unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0026] The technical solution of the embodiments of the present application is described in detail below with reference to the accompanying drawings.

[0027] like Figure 1 The fiber reinforced composite tendon (FRP) tendon anchoring system 16 shown is an environmental creep coupling device, including a creep relaxation device and an environmental simulation device 17 .

[0028] As shown in the figure, the creep relaxation device includes an upper crossbeam 1, a lower crossbeam 2, a column 3, a left bottom beam 4, a right bottom beam 5, a hinge support 6, an upper crossbeam U-shaped connecting plate 7, a lower crossbeam U-shaped connecting plate 8, a connecting plate 9, a counterweight platform 10, a positioning screw 11, a positioning plate 12, an upper loading plate 13, a lower loading plate 14, and a pressure test ring 15. The column 3 is fixedly installed on the ground through the left bottom beam 4, and a hinge support 6 is installed on the top of the column 3, and the upper crossbeam 1 is hinged on the hinge support 6. The left end of the upper crossbeam 1 is hinged to the upper crossbeam U-shaped connecting plate 7 through a pin shaft, and a positioning plate 12 is fixedly installed below the upper crossbeam U-shaped connecting plate 7. The upper loading plate 13 is connected to the lower loading plate 14 through 4 threaded steel columns below the positioning plate 12. In the same way, the lower loading plate 14 is bolted above the left bottom beam 4, and the upper loading plate 13 and the lower loading plate 14 are arranged opposite to each other. The pressure test ring 15 is installed on the upper loading plate 13, and the reaction frame 171 is connected to the lower loading plate 14. The right end of the upper crossbeam 1 is hinged with two rectangular connecting plates 9 through a pin shaft. The lower end of the upper crossbeam 1 is connected to the right end of the lower crossbeam 2 through the connecting plate 9. The lower crossbeam 2 is hinged to the connecting plate 9 through a pin shaft. The left end of the lower crossbeam 2 is connected to the counterweight platform 10, and the right end is hinged to the lower crossbeam U-shaped connecting plate 8 through a pin shaft. The lower crossbeam U-shaped connecting plate 8 is installed on the adjustment screw 11 through a nut, and the adjustment screw 11 is fixed to the ground through the right bottom beam 5.

[0029] like Figure 2As shown, the environmental simulation device 17 includes a reaction frame 171, an insulating water tank 172, a heating partition 173, and a heat source 174. The reaction frame 171, the heating partition 173, and the heat source 174 are arranged inside the insulating water tank, and the reaction frame is connected to the bottom of the lower load plate 14. The heating partition is used to isolate the heat source 174 from the FRP tendon anchoring system 16. The anchor of the FRP tendon anchoring system 16 is immersed in the simulated environment through the reaction frame 171, and the heat source 174 is isolated from the FRP tendon anchoring system 16 through the heating partition 173. The heating partition 173 replaces the material according to the environmental field such as humid heat, chloride solution or salt spray, such as the humid heat environment grille can be made of aluminum sheet; the heat source 174 uses a copper heat pipe as the heating material, which is rotated and welded on the side wall of the insulating water tank 172 and connected to the external temperature control system; the insulating water tank 172 is made of steel, and the insulation material is applied to the inner and outer surfaces of the water tank.

[0030] The creep device uses the double-lever principle. By simply adding a certain amount of counterweights in the counterweight mechanism, the double lever amplification effect of the upper beam and the lower beam can provide a long-lasting and constant load for the entire FRP tendon anchor system, and the load magnification factor can reach 40.

[0031] The FRP tendon anchoring system 16 is extended to the environmental factors at one end through the reaction frame 171, so that it is completely placed in high temperature, chloride ion aqueous solution or temperature radiation field. The temperature is radiated to the interface between the FRP tendon and the bonding medium through the water-metal anchoring component-epoxy resin bonding medium, and the moisture and salt ions penetrate through the gap between the upper and lower covers at one end of the FRP tendon anchoring system 16 and the aluminum sleeve and tendon, and diffuse to the interface in the bonding medium according to Fick's theorem.

[0032] The specific coupling operation is as follows: place a pressure test ring 15 above the upper loading plate 13, remove the nut 161 at one end of the FRP tendon anchoring system 16, adjust the lower loading plate 14 to an appropriate height through bolts, pass the FRP tendon anchoring system 16 with the nut 22 at one end mounted on the reaction frame 171 from the bottom to the top of the pressure test ring 15, and then tighten the nut 22 to full thread; place the environmental simulation device 17 between the upper part of the left bottom beam 4 and the four screws connecting the lower loading plate 14, move the lower loading plate 14 close to the top surface of the reaction frame 171 and fix it, as shown in FIG. Figure 3 As shown. Aluminum sheet extensometers 18 are attached to the upper and lower loading ends of the FRP tendon anchoring system 16, and a U-shaped extensometer 19 is selected for displacement measurement of the underwater part. An iron plate equivalent load is placed on the counterweight platform 10, and data collection begins after the pressure test ring is adjusted to the creep corresponding load. Continuous data collection and recording are performed for the first hour, and subsequent measurements are performed when the test is carried out for 1.5, 2, 4, 10, 24, 48, 72, 96 and 120 hours. Measurements after 120 hours should be taken at least once every 120 hours. The final test results in the creep curve of the FRP tendon and the relative slip-time curve of the anchor assembly.

[0033] Finally, it should be noted that, in this article, relationships such as first and second, etc. are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms include, include or any other variations are intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0034] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0035] The embodiments of the present application have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. An environmental creep coupling device for a fiber reinforced composite tendon anchoring system, characterized in that: include: The creep relaxation device comprises a crossbeam, a column, a bottom beam, a counterweight platform, a positioning screw, a positioning plate, an upper loading plate, a lower loading plate and a pressure test ring. The crossbeam is arranged up and down and the ends are connected by a connecting plate. The other end of the upper crossbeam is connected to the upper loading plate through the positioning plate. The pressure test ring is installed on the upper loading plate. The upper crossbeam is also connected to the column. The column is connected to the ground through the bottom beam. The lower loading plate is connected to the bottom beam and the lower loading plate is arranged opposite to the upper loading plate. One end of the lower crossbeam close to the column is connected to the counterweight platform, and the other end is connected to the bottom beam through the positioning screw. The environmental simulation device is arranged below the lower load plate, and comprises an insulating water tank and a reaction frame, a heating partition and a heat source arranged inside the tank. The reaction frame is connected below the lower load plate, and the heating partition isolates the heat source from the FRP tendon anchoring system.

2. The environmental creep coupling device for fiber reinforced composite tendon anchoring system according to claim 1, characterized in that: The positioning plate is connected to the upper loading plate at its lower side via four threaded steel columns, and the bottom beam is connected to the lower loading plate at its upper side via four threaded steel columns.

3. The environmental creep coupling device for fiber reinforced composite tendon anchoring system according to claim 1, characterized in that: The upper cross beam is connected to the column via a hinge support.

4. The environmental creep coupling device for fiber reinforced composite tendon anchoring system according to claim 1, characterized in that: The right end of the upper cross beam is hinged to the right end bolt shaft of the lower cross beam through a connecting plate, and the left end of the upper cross beam is hinged to the positioning plate bolt shaft through a U-shaped connecting plate.

5. The environmental creep coupling device for fiber reinforced composite tendon anchoring system according to claim 1, characterized in that: One end of the FRP tendon anchoring system is connected to the pressure test ring, and the other end is placed in the environmental simulation device.

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