An experimental device for studying the influence of pitting corrosion on the mechanical properties of anchor rods

Abstract

The present invention discloses an experimental device for studying the effect of pitting on the mechanical properties of anchor rods. To study the influence of pitting on the mechanical properties of anchor rods during anchor support, the device comprises a main platform, a pitting test anchor rod assembly, and an anchor rod loading module. The device can implement two test modes: testing the effects of different pitting positions and quantities on the mechanical properties of anchor rods under equal stress loading, and testing the effects of the same pitting position and quantity on the mechanical properties of anchor rods under different stresses. On the one hand, the present invention ensures that the effects of different pitting positions and quantities on the mechanical properties of anchor rods are tested under the same external load; on the other hand, it ensures that the effects of different stress loading conditions are tested under the same pitting position and quantity.

Description

Technical Field

[0001] The invention relates to a device for testing the mechanical properties of an anchor rod. Background Art

[0002] Anchor bolts are the primary equipment for supporting tunnels in underground coal mining, and their support capacity is an important guarantee for safe and efficient coal mining. During anchor support, different parts of the bolt body are subjected to different stresses. Furthermore, various active ions, sulfur, and other elements contained in the ore in the rock formation dissolve in groundwater, forming a strong localized corrosion environment, which in turn causes pitting corrosion in the bolts. This accelerates the corrosion of the bolts in this environment, degrading their support performance and posing a safety hazard. Therefore, exploring and understanding the influence of pitting corrosion on the strength of the bolts, and then proposing prevention and improvement strategies, is of great significance for improving the bolt support performance and service life. Based on this, it is urgent to design an experimental device that can simulate the influence of pitting corrosion on the mechanical properties of the bolts under the working environment. Summary of the Invention

[0003] Purpose of the invention: In view of the above-mentioned prior art, an experimental device is proposed that can simulate the influence of pitting corrosion on the mechanical properties of anchor rods in their working environment.

[0004] Technical solution: An experimental device for studying the effect of pitting corrosion on the mechanical properties of anchor bolts, including a main platform, several pitting corrosion test anchor bolt components, and an anchor bolt loading module;

[0005] The main platform includes a vertical plate, a bottom plate and a corrosion box; the vertical plate and the corrosion box are fixed on the bottom plate, the vertical plate is relatively arranged at the right end of the corrosion box, and a number of three-jaw chucks are fixed on the inner side of the vertical plate; a number of water inlets are arranged on the top cover of the corrosion box, and a water outlet is arranged at the bottom of the corrosion box;

[0006] The pitting test anchor assembly includes a casing, a plurality of sealing screws, a plurality of pitting rings, and a plurality of annular sealing fillers; the inner diameter of the casing is the same as the outer diameter of the pitting ring and the annular sealing filler, and the inner diameters of the pitting ring and the annular sealing filler are the same; a plurality of through holes I are provided on the casing at intervals along the axial direction, and the through holes I are arranged upward; a pitting through hole is provided on the pitting ring, and the diameter of the pitting through hole is less than or equal to the diameter of the through hole I; the pitting ring is placed in the casing, and the position of each pitting ring corresponds to the through hole I one by one, the pitting through hole is arranged upward and coaxial with the through hole I, and the remaining space in the casing is filled with a sealing filler coaxially arranged with the pitting ring The sealing screw is used to seal the through hole I and the pitting through hole other than the measured point; a casing flange is provided at one end of the casing, and a packing pressing cover is provided at the other end; the pitting test anchor assembly is horizontally arranged in the corrosion box, and the two ends of the casing are fixed to the left and right ends of the corrosion box respectively through the connection of bolts I with the casing flange and the packing pressing cover; through holes II are provided on the left and right ends of the corrosion box opposite to the casing, and the anchor rod to be tested passes through the through hole II on one side of the corrosion box into the pitting test anchor assembly and passes out from the through hole II on the other side of the corrosion box; other areas in the corrosion box are filled with gravel;

[0007] The anchor loading module includes an anchor fixing platform, a guide rail, and a tension and compression loading cylinder I; the guide rail is set at the left end of the base plate, the anchor fixing platform is slidingly connected to the guide rail, and the tension and compression loading cylinder I is used to drive the anchor fixing platform to move on the guide rail; one end of the anchor to be tested is located outside the corrosion box and is connected to the anchor fixing platform, and the other end is connected to the three-jaw chuck on the vertical plate.

[0008] Furthermore, the anchor rod fixing platform includes a base and a pressure plate; guide columns are provided on both sides of the top of the base, and the pressure plate is arranged above the base and connected to the guide columns through the through holes III on both sides; the end of the guide column is provided with a thread, and the pressure plate is fixed by connecting the nut I; semi-circular pressure grooves are correspondingly opened on the opposite surfaces of the base and the pressure plate, and the diameter of the circular hole formed relatively is smaller than the diameter of the anchor rod to be measured, one end of the anchor rod to be measured is located in the circular hole, and the pressure plate presses the anchor rod to be measured; two nuts II are also connected to the anchor rod to be measured, and the nuts II axially fix the anchor rod to be measured from both sides of the base.

[0009] Further, it includes a main platform, several pitting test anchor components, and an anchor loading module;

[0010] The main platform includes a vertical plate, a bottom plate and a corrosion box; the vertical plate and the corrosion box are fixed on the bottom plate, the vertical plate is relatively arranged at the right end of the corrosion box, and a number of three-jaw chucks are fixed on the inner side of the vertical plate; a number of water inlets are arranged on the top cover of the corrosion box, and a water outlet is arranged at the bottom of the corrosion box;

[0011] The pitting test anchor assembly includes a casing, a plurality of sealing screws, a plurality of pitting rings, and a plurality of annular sealing fillers; the inner diameter of the casing is the same as the outer diameter of the pitting ring and the annular sealing filler, and the inner diameters of the pitting ring and the annular sealing filler are the same; a plurality of through holes I are provided on the casing at intervals along the axial direction, and the through holes I are arranged upward; a pitting through hole is provided on the pitting ring, and the diameter of the pitting through hole is less than or equal to the diameter of the through hole I; the pitting ring is placed in the casing, and the position of each pitting ring corresponds to the through hole I one by one, the pitting through hole is arranged upward and coaxial with the through hole I, and the remaining space in the casing is filled with a sealing filler coaxially arranged with the pitting ring The sealing screw is used to seal the through hole I and the pitting through hole other than the measured point; a casing flange is provided at one end of the casing, and a packing pressing cover is provided at the other end; the pitting test anchor assembly is horizontally arranged in the corrosion box, and the two ends of the casing are fixed to the left and right ends of the corrosion box respectively through the connection of bolts I with the casing flange and the packing pressing cover; through holes II are provided on the left and right ends of the corrosion box opposite to the casing, and the anchor rod to be tested passes through the through hole II on one side of the corrosion box into the pitting test anchor assembly and passes out from the through hole II on the other side of the corrosion box; other areas in the corrosion box are filled with gravel;

[0012] The anchor loading module includes a cylinder fixing platform and several tensile and compressive loading cylinders II; the cylinder fixing platform is fixedly set at the left end of the corrosion box, and the tensile and compressive loading cylinders II are fixed on the cylinder fixing platform. The piston rod end of each tensile and compressive loading cylinder II is respectively connected to one end of a tested anchor outside the corrosion box, and the other end of the tested anchor outside the corrosion box is connected to the three-jaw chuck on the vertical plate.

[0013] Furthermore, a blind hole is provided in the axial direction at the piston rod end of the tension and compression loading cylinder II, and a plurality of radial through holes IV are provided at intervals on the circumference of the blind hole. The end of the anchor rod to be tested is inserted into the blind hole, and a bolt II is screwed into the through hole IV to fix the anchor rod to be tested.

[0014] Beneficial effects: 1. The present invention provides an experimental device for studying the influence of pitting on the mechanical properties of anchor rods. In order to study the influence of pitting on the mechanical properties of anchor rods during anchor support, two test modes can be implemented: the influence of different pitting positions and numbers on the mechanical properties of anchor rods under the same stress loading test, and the influence of the same pitting position and number on the mechanical properties of anchor rods under different stresses. In order to test the influence of pitting on the mechanical properties of anchor rods, the present invention can, on the one hand, ensure that the external load of the anchor rod is the same, and test the influence of pitting at different positions and numbers on its mechanical properties; on the other hand, ensure that the position and number of pitting are the same, and test the influence of different stress loading conditions on its mechanical properties.

[0015] 2. This technology not only simulates the surrounding rock conditions of the roadway during anchor support, but also creates a more realistic working environment for the anchor, characterized by high humidity and acidity. By measuring the anchor's corrosion potential using a potentiometer, the effects of different loading conditions and pitting characteristics on anchor corrosion can be more intuitively tested. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the three-dimensional structure of the experimental device of Example 1;

[0017] Figure 2 This is a schematic diagram of the top view of the experimental device of Example 1;

[0018] Figure 3 Schematic diagram I of the structure of the anchor rod fixing platform in the experimental device of Example 1;

[0019] Figure 4 Schematic diagram II of the structure of the anchor rod fixing platform in the experimental device of Example 1;

[0020] Figure 5 This is a schematic diagram of the three-dimensional structure of the experimental device of Example 2;

[0021] Figure 6 Schematic diagram of the three-dimensional structure of the anchor rod assembly for pitting corrosion testing in the experimental device of Examples 1 and 2;

[0022] Figure 7 Schematic diagram of the cross-sectional structure of a casing 1 / 4 of the anchor assembly for pitting corrosion testing in the experimental apparatus of Examples 1 and 2;

[0023] Figure 8 Schematic diagram of the cross-sectional structure of the pitting ring 1 / 4 of the anchor assembly for pitting corrosion testing in the experimental apparatus of Examples 1 and 2;

[0024] Figure 9 This is a schematic diagram of the structure of the anchor rod fixed by the tension and compression loading cylinder II in the experimental device of Example 2. DETAILED DESCRIPTION

[0025] The present invention will be further explained below with reference to the accompanying drawings.

[0026] like Figure 1 、 Figure 2 The experimental device for studying the effect of pitting on the mechanical properties of anchor rods is shown in Figure 1. It is used to apply equal stress to the anchor rods to test the effects of different pitting locations and amounts on the mechanical properties of the anchor rods. The experimental device includes a main platform 5, several pitting test anchor rod assemblies 3, and an anchor rod loading module.

[0027] The main platform 5 comprises a vertical plate 51, a bottom plate 52, and a corrosion chamber 53. The vertical plate 51 and the corrosion chamber 53 are fixed to the bottom plate 52, with the vertical plate 51 positioned opposite the right end of the corrosion chamber 53. A plurality of three-jaw chucks 4 are fixed to the inner side of the vertical plate 51. The top cover 2 of the corrosion chamber 53 is provided with a plurality of water inlets 1, through which external water enters the corrosion chamber 53. A water outlet 6 is provided at the bottom of the corrosion chamber 53.

[0028] like Figures 6 to 8 As shown, the pitting test anchor assembly 3 includes a sleeve 33, a plurality of sealing screws 37, a plurality of pitting rings 38, and a plurality of annular sealing packings 39. The inner diameter of the sleeve 33 is the same as the outer diameter of the pitting rings 38 and the annular sealing packings 39, and the inner diameters of the pitting rings 38 and the annular sealing packings 39 are the same. The sleeve 33 is provided with a plurality of through holes 1331 spaced axially, and the through holes 1331 are arranged upward. The pitting rings 38 are provided with pitting through holes 381, and the diameter of the pitting through holes 381 is less than or equal to the diameter of the through hole 1331. The pitting rings 38 are placed in the sleeve 33, and the position of each pitting ring 38 corresponds to the through hole 1331. The pitting through holes 381 are arranged upward and coaxially with the through hole 1331. The through hole 1331 connects the inner through hole of the sleeve 33 with the outside. The remaining space in the sleeve 33 is filled with the sealing packing 39 arranged coaxially with the pitting rings 38. A raised ring is provided at the left end of the inner bore of the sleeve 33 to axially limit the sealing filler 39. When studying the effects of different pitting locations and quantities on the mechanical properties of the anchor rod, a sealing screw 37 is used to seal the through-hole I331 and the pitting through-hole 381 outside the measured point. The measured point of the anchor rod 31 is directly connected to the outside world, and the sealing filler 39 ensures that corrosion occurs only at the measured point, without affecting other locations of the anchor rod 31.

[0029] One end of the sleeve 33 is provided with a sleeve flange 35, and the other end is provided with a packing pressing cover 32, which is used to press the sealing packing 39 at the end. The overall length of the corrosion test anchor assembly 3 is equal to the length of the internal space of the corrosion box 53. The pitting corrosion test anchor assembly 3 is horizontally arranged in the corrosion box 53, and the sleeve flange 35 and the packing pressing cover 32 are in contact with the inner surfaces on both sides of the internal space of the corrosion box 53 respectively, and the two ends of the sleeve 33 are fixed to the left and right ends of the corrosion box 53 respectively through the connection with the sleeve flange 35 and the packing pressing cover 32 by bolts I34. A through hole II is provided on the left and right ends of the corrosion box 53, facing the sleeve 33. The anchor rod 31 to be tested passes through the through hole II on one side of the corrosion box 53 into the pitting corrosion test anchor assembly 3, and passes through the through hole II on the other side of the corrosion box 53; other areas in the corrosion box 53 are filled with gravel 10.

[0030] The anchor loading module includes an anchor fixing platform 7, a guide rail 8, and a tension and compression loading cylinder 19. The guide rail 8 is located at the left end of the base plate 52, with the anchor fixing platform 7 slidingly connected to the guide rail 8. The tension and compression loading cylinder 19 is used to drive the anchor fixing platform 7 along the guide rail 8. The anchor 31 under test, located outside the corrosion chamber 53, is connected to the anchor fixing platform 7 at one end and to the three-jaw chuck 4 on the vertical plate 51 at the other end.

[0031] like Figure 3 、 Figure 4As shown, the anchor rod fixing platform 7 includes a base 71 and a pressure plate 72. Guide columns 73 are provided on both sides of the top of the base 71. The pressure plate 72 is arranged above the base 71 and is connected to the guide columns 73 through the through holes III on both sides. The pressure plate 72 can move up and down with the help of the guide columns 73. The end of the guide column 73 is provided with a thread, and the pressure plate 72 is limited and fixed by connecting the nut I74. Semi-circular arc-shaped pressure grooves are correspondingly opened on the opposite surfaces of the base 71 and the pressure plate 72. The diameter of the circular hole formed relatively is smaller than the diameter of the anchor rod 31 to be measured. One end of the anchor rod 31 to be measured is located in the circular hole, and the pressure plate 72 presses the anchor rod 31 to be measured. Two nuts II311 are also connected to the anchor rod 31 to be measured. The nuts II311 respectively fix the anchor rod 31 to be measured axially from both sides of the base 71, so as to be used for two different states of tension and compression.

[0032] The tension and compression loading cylinder I9 moves the base 71 on the slide rail 8 by pulling and pushing the piston rod, so as to apply the same stress to multiple anchor rods 31 under test, and study the influence of the number and position of pitting on the mechanical properties of the anchor rod under the same stress conditions.

[0033] After the anchor is installed, the corrosion box 53 is filled with gravel 10 to simulate the tunnel environment during anchor support. External water enters the corrosion box 53 through the water inlet 1 on the top cover 2 of the corrosion box 53 to simulate the groundwater inside the tunnel rock layer during anchor support and create a humidity environment. The water outlet 6 can discharge the acidic water in the corrosion box 53. During the anchor loading test, the anchor 31 to be tested is connected through a potentiometer to monitor the corrosion potential of the anchor, which is used to judge the corrosion conditions of the same pitting position and number under different stress loads or different pitting positions and numbers under the same stress, and further study the impact on its mechanical properties.

[0034] Example 2:

[0035] like Figure 5 The experimental device for studying the effect of pitting on the mechanical properties of anchor rods is shown. It is used to test the effects of stresses of varying magnitude and type on the mechanical properties of anchor rods, based on the same pitting location and number. The experimental device includes a main platform 5, several pitting test anchor rod assemblies 3, and an anchor rod loading module.

[0036] The main platform 5 includes a vertical plate 51, a bottom plate 52, and a corrosion box 53. The vertical plate 51 and the corrosion box 53 are fixed to the bottom plate 52. The vertical plate 51 is positioned opposite the right end of the corrosion box 53. Several three-jaw chucks 4 are fixed to the inner side of the vertical plate 51. Several water inlets 1 are provided on the top cover plate 2 of the corrosion box 53, and a water outlet 6 is provided at the bottom of the corrosion box 53.

[0037] like Figures 6 to 8As shown, the pitting test anchor assembly 3 includes a sleeve 33, a plurality of sealing screws 37, a plurality of pitting rings 38, and a plurality of annular sealing packings 39. The inner diameter of the sleeve 33 is the same as the outer diameter of the pitting rings 38 and the annular sealing packings 39, and the inner diameters of the pitting rings 38 and the annular sealing packings 39 are the same. The sleeve 33 is provided with a plurality of through holes 1331 spaced axially, and the through holes 1331 are arranged upward. The pitting rings 38 are provided with pitting through holes 381, and the diameter of the pitting through holes 381 is less than or equal to the diameter of the through hole 1331. The pitting rings 38 are placed in the sleeve 33, and the position of each pitting ring 38 corresponds to the through hole 1331. The pitting through holes 381 are arranged upward and coaxially with the through hole 1331. The through hole 1331 connects the inner through hole of the sleeve 33 with the outside. The remaining space in the sleeve 33 is filled with the sealing packing 39 arranged coaxially with the pitting rings 38. A raised ring is provided at the left end of the inner bore of the sleeve 33 to axially limit the sealing filler 39. When studying the effects of different pitting locations and quantities on the mechanical properties of the anchor rod, a sealing screw 37 is used to seal the through-hole I331 and the pitting through-hole 381 outside the measured point. The measured point of the anchor rod 31 is directly connected to the outside world, and the sealing filler 39 ensures that corrosion occurs only at the measured point, without affecting other locations of the anchor rod 31.

[0038] One end of the sleeve 33 is provided with a sleeve flange 35, and the other end is provided with a packing pressing cover 32, which is used to press the sealing packing 39 at the end. The overall length of the corrosion test anchor assembly 3 is equal to the length of the internal space of the corrosion box 53. The pitting corrosion test anchor assembly 3 is horizontally arranged in the corrosion box 53, and the sleeve flange 35 and the packing pressing cover 32 are in contact with the inner surfaces on both sides of the internal space of the corrosion box 53 respectively, and the two ends of the sleeve 33 are fixed to the left and right ends of the corrosion box 53 respectively through the connection with the sleeve flange 35 and the packing pressing cover 32 by bolts I34. A through hole II is provided on the left and right ends of the corrosion box 53, facing the sleeve 33. The anchor rod 31 to be tested passes through the through hole II on one side of the corrosion box 53 into the pitting corrosion test anchor assembly 3, and passes through the through hole II on the other side of the corrosion box 53; other areas in the corrosion box 53 are filled with gravel 10.

[0039] The anchor loading module includes a cylinder fixing platform 11 and several tension and compression loading cylinders II12. The cylinder fixing platform 11 is fixedly set at the left end of the corrosion box 53. The tension and compression loading cylinders II12 are fixed to the cylinder fixing platform 11. The end of the piston rod 121 of each tension and compression loading cylinder II12 is respectively connected to one end of a tested anchor 31 located outside the corrosion box 53. The other end of the tested anchor 31 located outside the corrosion box 53 is connected to the three-jaw chuck 4 on the vertical plate 51.

[0040] like Figure 9As shown, a blind hole is provided at the end of the piston rod 121 of the tension and compression loading cylinder II12 along the axial direction, and a plurality of radial through holes IV are provided at intervals on the circumference of the blind hole. The end of the anchor rod 31 to be measured is inserted into the blind hole, and a bolt II122 is screwed into the through hole IV to fix the anchor rod 31 to be measured.

[0041] In this embodiment, when testing the influence of the same pitting position and number and different magnitudes of stress on the mechanical properties of the anchor rod, the same number of tension and compression loading cylinders II12 are fixedly installed on the cylinder fixing platform 11 according to the number of anchor rods 31 to be tested. The tension and compression loading cylinders II12 are used to apply stress of different magnitudes and modes to each anchor rod 31 to be tested, so as to realize the test of the influence of different stress magnitudes and modes on the mechanical properties of the anchor rod under the same pitting conditions.

[0042] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. An experimental device for studying the influence of pitting corrosion on the mechanical properties of anchor rods, characterized in that: It includes a main platform (5), a plurality of pitting test anchor rod assemblies (3), and an anchor rod loading module; The main platform (5) includes a vertical plate (51), a bottom plate (52) and a corrosion box (53); the vertical plate (51) and the corrosion box (53) are fixed on the bottom plate (52), the vertical plate (51) is relatively arranged at the right end of the corrosion box (53), and a plurality of three-jaw chucks (4) are fixed on the inner side surface of the vertical plate (51); a plurality of water inlets (1) are provided on the top cover plate (2) of the corrosion box (53), and a water outlet (6) is provided at the bottom of the corrosion box (53); The pitting test anchor assembly (3) comprises a sleeve (33), a plurality of sealing screws (37), a plurality of pitting rings (38), and a plurality of annular sealing fillers (39); the inner diameter of the sleeve (33) is the same as the outer diameter of the pitting ring (38) and the annular sealing filler (39); the inner diameters of the pitting ring (38) and the annular sealing filler (39) are the same; a plurality of through holes I (331) are provided on the sleeve (33) at intervals along the axial direction, and the through holes I (331) are arranged upward; a pitting through hole (381) is provided on the pitting ring (38), and the diameter of the pitting through hole (381) is less than or equal to the diameter of the through hole I (331); the pitting ring (38) is placed in the sleeve (33), and the position of each pitting ring (38) corresponds to the through hole I (331) one by one, the pitting through hole (381) is arranged upward and coaxial with the through hole I (331), and the remaining space in the sleeve (33) is composed of a plurality of through holes I (331) and a plurality of through holes I (331). ) is filled with a coaxially arranged sealing filler (39); a sealing screw (37) is used to seal the through hole I (331) and the pitting through hole (381) outside the position of the measured point; a sleeve flange (35) is provided at one end of the sleeve (33), and a packing pressing cover (32) is provided at the other end; the pitting test anchor rod assembly (3) is horizontally arranged in the corrosion box (53), and the two ends of the sleeve (33) are fixed to the left and right ends of the corrosion box (53) respectively through the connection of the bolt I (34) with the sleeve flange (35) and the packing pressing cover (32); a through hole II is provided on the left and right ends of the corrosion box (53) facing the sleeve (33), and the tested anchor rod (31) passes through the through hole II on one side of the corrosion box (53) into the pitting test anchor rod assembly (3), and passes out from the through hole II on the other side of the corrosion box (53); other areas in the corrosion box (53) are filled with gravel (10); The anchor loading module includes an anchor fixing platform (7), a guide rail (8), and a tension-compression loading cylinder I (9); the guide rail (8) is arranged at the left end of the base plate (52), the anchor fixing platform (7) is slidably connected to the guide rail (8), and the tension-compression loading cylinder I (9) is used to drive the anchor fixing platform (7) to move on the guide rail (8); one end of the anchor to be tested (31) located outside the corrosion box (53) is connected to the anchor fixing platform (7), and the other end is connected to the three-jaw chuck (4) on the vertical plate (51).

2. The experimental device for studying the influence of pitting corrosion on the mechanical properties of anchor rods according to claim 1, characterized in that: The anchor rod fixing platform (7) includes a base (71) and a pressure plate (72); guide columns (73) are provided on both sides of the top of the base (71); the pressure plate (72) is arranged above the base (71) and is connected to the guide columns (73) through the through holes III on both sides; the ends of the guide columns (73) are provided with threads, and the pressure plate (72) is fixed by connecting nuts I (74); semi-circular arc-shaped pressure grooves are correspondingly opened on the opposite surfaces of the base (71) and the pressure plate (72), and the diameter of the circular hole formed relatively is smaller than the diameter of the anchor rod (31) to be measured, one end of the anchor rod (31) to be measured is located in the circular hole, and the pressure plate (72) presses the anchor rod (31) to be measured; two nuts II (311) are also connected to the anchor rod (31), and the nuts II (311) respectively fix the anchor rod (31) to be measured axially from both sides of the base (71).

3. An experimental device for studying the influence of pitting corrosion on the mechanical properties of anchor rods, characterized in that: It includes a main platform (5), a plurality of pitting test anchor rod assemblies (3), and an anchor rod loading module; The main platform (5) includes a vertical plate (51), a bottom plate (52) and a corrosion box (53); the vertical plate (51) and the corrosion box (53) are fixed on the bottom plate (52), the vertical plate (51) is relatively arranged at the right end of the corrosion box (53), and a plurality of three-jaw chucks (4) are fixed on the inner side surface of the vertical plate (51); a plurality of water inlets (1) are provided on the top cover plate (2) of the corrosion box (53), and a water outlet (6) is provided at the bottom of the corrosion box (53); The pitting test anchor assembly (3) comprises a sleeve (33), a plurality of sealing screws (37), a plurality of pitting rings (38), and a plurality of annular sealing fillers (39); the inner diameter of the sleeve (33) is the same as the outer diameter of the pitting ring (38) and the annular sealing filler (39); the inner diameters of the pitting ring (38) and the annular sealing filler (39) are the same; a plurality of through holes I (331) are provided on the sleeve (33) at intervals along the axial direction, and the through holes I (331) are arranged upward; a pitting through hole (381) is provided on the pitting ring (38), and the diameter of the pitting through hole (381) is less than or equal to the diameter of the through hole I (331); the pitting ring (38) is placed in the sleeve (33), and the position of each pitting ring (38) corresponds to the through hole I (331) one by one, the pitting through hole (381) is arranged upward and coaxial with the through hole I (331), and the remaining space in the sleeve (33) is composed of a plurality of through holes I (331) and a plurality of through holes I (331). ) is filled with a coaxially arranged sealing filler (39); a sealing screw (37) is used to seal the through hole I (331) and the pitting through hole (381) outside the position of the measured point; a sleeve flange (35) is provided at one end of the sleeve (33), and a packing pressing cover (32) is provided at the other end; the pitting test anchor rod assembly (3) is horizontally arranged in the corrosion box (53), and the two ends of the sleeve (33) are fixed to the left and right ends of the corrosion box (53) respectively through the connection of the bolt I (34) with the sleeve flange (35) and the packing pressing cover (32); a through hole II is provided on the left and right ends of the corrosion box (53) facing the sleeve (33), and the tested anchor rod (31) passes through the through hole II on one side of the corrosion box (53) into the pitting test anchor rod assembly (3), and passes out from the through hole II on the other side of the corrosion box (53); other areas in the corrosion box (53) are filled with gravel (10); The anchor rod loading module includes a cylinder fixing platform (11) and a plurality of tension and compression loading cylinders II (12); the cylinder fixing platform (11) is fixedly arranged at the left end of the corrosion box (53), the tension and compression loading cylinders II (12) are fixed on the cylinder fixing platform (11), the end of the piston rod (121) of each tension and compression loading cylinder II (12) is respectively connected to one end of a tested anchor rod (31) located outside the corrosion box (53), and the other end of the tested anchor rod (31) located outside the corrosion box (53) is connected to the three-jaw chuck (4) on the vertical plate (51).

4. The experimental device for studying the influence of pitting corrosion on the mechanical properties of anchor rods according to claim 3, characterized in that: The end of the piston rod (121) of the tension and compression loading cylinder II (12) is provided with a blind hole along the axial direction, and a plurality of radial through holes IV are provided at intervals on the circumference of the blind hole. The end of the anchor rod (31) to be tested is inserted into the blind hole, and a bolt II (122) is screwed into the through hole IV to fix the anchor rod (31) to be tested.

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