System for testing torsional fatigue of corroded steel sheet pile

Abstract

The invention discloses a system for testing torsional fatigue after corrosion of a steel sheet pile, the system comprises a corrosion device and a torsion device, the corrosion device comprises a corrosion assembly and a liquid storage tank, the steel sheet pile is inserted in the corrosion assembly, the corrosion assembly and the liquid storage tank are connected through a circulation assembly, and the corrosion assembly is provided with an air blowing assembly; the torsion device comprises a support, clamping assemblies are rotationally arranged at the upper end and the lower end of the support, gear rings are fixedly arranged on the clamping assemblies, teeth are arranged on the outer circle faces of the gear rings, a motor is fixedly arranged on the support, the motor is in transmission connection with a gear, and the gear is meshed with the gear rings. According to the method, the steel sheet pile is inserted into the corrosion device for corrosion environment simulation, the steel sheet pile is corroded in the simulated use state, then the steel sheet pile is placed into the torsion device for torsion fatigue testing until the steel sheet pile is broken, and therefore torsion fatigue data of the steel sheet pile after corrosion are obtained. The method is used for judging reuse times of the steel sheet pile.

Description

Technical Field

[0001] The present invention relates to the technical field of steel sheet pile corrosion, and particularly to a torsional fatigue test system for corroded steel sheet piles. Background Art

[0002] A steel sheet pile is a type of profiled steel with a locking groove. Its cross-section has straight plate shape, trough shape, Z shape, etc., and there are various sizes and interlocking forms. Common ones include Larsen type, Lackawanna type, etc. Its advantages are: high strength, easy to drive into hard soil layers; can be constructed in deep water, and when necessary, add inclined supports to form a cofferdam. Good waterproof performance; can form cofferdams of various shapes as needed and can be reused multiple times. Therefore, it has a wide range of uses.

[0003] In some offshore engineering projects, steel sheet piles are also widely used. However, the marine environment is relatively complex, and steel sheet piles will be affected by various environmental factors. After the steel sheet piles are inserted into the soil in the sea water, when the sea water rises, the sea water will submerge the soil, making the soil wet; after the sea water ebbs, the soil will be dried and sun-dried by the sea breeze and the sun. With the continuous ebb and flow of the tides, the soil with steel sheet piles inserted will continuously undergo wet-dry alternation, thereby corroding the steel sheet piles. With the continuous corrosion of the steel sheet piles, the service life of the steel sheet piles will be affected; and the service life of the corroded steel sheet piles will inevitably be affected. Therefore, it is necessary to conduct torsional fatigue tests on the corroded steel sheet piles to determine the impact on the torsional fatigue of the steel sheet piles. However, at present, there is no equipment that can simulate the corrosion environment and conduct torsional fatigue tests on steel sheet piles, so it is impossible to test the torsional fatigue of corroded steel sheet piles, and thus it cannot provide data support for the corrosion research of steel sheet piles and the reuse situation after corrosion. Summary of the Invention

[0004] The purpose of the present invention is to provide a torsional fatigue test system for corroded steel sheet piles in view of the above-mentioned deficiencies of the prior art.

[0005] To solve the above problems, the technical solution adopted by the present invention is:

[0006] A torsional fatigue test system for corroded steel sheet piles includes a corrosion device and a torsion device. The corrosion device includes a corrosion component and a liquid storage tank. A steel sheet pile is inserted into the corrosion component. The corrosion component and the liquid storage tank are connected by a circulation component. A blowing component is also provided on the corrosion component;

[0007] The torsion device includes a bracket. Clamping components are rotatably provided at both the upper end and the lower end of the bracket. A gear ring is fixedly provided on the clamping component. Teeth are provided on the outer circumferential surface of the gear ring. A motor is fixedly provided on the bracket. The motor is drivingly connected to a gear, and the gear meshes with the gear ring.

[0008] Preferably, the corrosion component includes an outer sleeve, an inner sleeve is fixedly arranged inside the outer sleeve, the inner sleeve is communicated with the outer sleeve, soil is filled in the inner sleeve, a steel sheet pile is inserted into the soil, and the air blowing component is arranged above the inner sleeve for blowing air into the inner sleeve.

[0009] Preferably, a sieve plate is fixedly arranged inside the inner sleeve for carrying the soil, and a plurality of through holes are formed in the side wall of the inner sleeve, and the through holes are located below the sieve plate.

[0010] Preferably, the air blowing component includes an air cap, the air cap is arranged above the inner sleeve, a gap is left between the air cap and the inner sleeve, and an air inlet pipe is connected to the air cap for blowing air into the inner sleeve.

[0011] Preferably, the circulating component includes a water suction pipe and a first return pipe, one end of the water suction pipe is connected to the liquid storage tank, and the other end is connected to the upper part of the outer sleeve, and one end of the first return pipe is connected to the liquid storage tank, and the other end is connected to the bottom of the outer sleeve.

[0012] Preferably, a filtering component is arranged on the first return pipe, the filtering component includes a filtering cup, a cup cover is fixedly arranged at the top of the filtering cup, a filter screen is arranged inside the filtering cup, and filter paper is laid on the inner wall of the filter screen.

[0013] Preferably, the clamping component includes a first clamping block and a second clamping block, both the first clamping block and the second clamping block are of semicircular structures, a clamping block is arranged on the first clamping block, two side walls of the clamping block are inclined, a clamping groove is arranged on the second clamping block, two side walls of the clamping groove are inclined, and after the first clamping block and the second clamping block are closed, the clamping block is clamped in the clamping groove to clamp the steel sheet pile, and the tooth ring is sleeved on the first clamping block and the second clamping block.

[0014] Preferably, the clamping component includes a clamping plate, the clamping plate is rotatably arranged on a bracket, the tooth ring is sleeved on the clamping plate, a clamping groove is formed in the clamping plate, an outer clamping block, a web clamping block and an inner clamping block are arranged in the clamping groove, the outer clamping block is slidably arranged in the clamping groove, two outer clamping blocks are arranged and are symmetrically arranged, the web clamping block is slidably arranged between the two outer clamping blocks, the inner clamping block is slidably arranged on the web clamping block, and two inner clamping blocks are arranged and are symmetrically arranged.

[0015] Preferably, a first threaded post and a second threaded post are rotatably arranged on the clamping plate. The first threaded post is threadedly connected to the outer clamping block, and the second threaded post is threadedly connected to the web clamping block. A third threaded post is arranged between the two inner clamping blocks. The third threaded post is provided with a double-thread, and is respectively threadedly connected to the two inner clamping blocks.

[0016] The beneficial effects of adopting the above technical solution are as follows:

[0017] In the present invention, the steel sheet pile is inserted into the corrosion component. The liquid in the liquid storage tank is pumped into the corrosion component to wet the steel sheet pile, and then after discharging the liquid, the steel sheet pile is blown by the blowing component to make it dry, so as to simulate the corrosion conditions of the steel sheet pile in the marine environment; the corroded steel sheet pile is placed in the torsion device, and both ends of the steel sheet pile are fixedly connected to the clamping component respectively. Subsequently, the motor drives the gear ring to rotate, thereby driving the clamping component to rotate and twist the steel sheet pile until the steel sheet pile breaks. Finally, the torsional fatigue times of the corroded steel sheet pile can be obtained, providing data support for the corrosion research of the steel sheet pile and the reuse situation after corrosion. Description of the Drawings

[0018] Figure 1 The usage flow chart of the present invention;

[0019] Figure 2 It is a schematic structural diagram of the corrosion device of the present invention;

[0020] Figure 3 It is a three-dimensional schematic diagram of the wind cap of the present invention;

[0021] Figure 4 It is a schematic structural diagram of the filtering component of the present invention;

[0022] Figure 5 It is a schematic structural diagram of the cooling component of the present invention;

[0023] Figure 6 It is a three-dimensional schematic diagram of the torsion device of the present invention;

[0024] Figure 7 It is a three-dimensional schematic diagram of the clamping component of the present invention;

[0025] Figure 8 It is an exploded view of the clamping component of the present invention;

[0026] Figure 9 It is a three-dimensional schematic diagram of the clamping component of another embodiment of the present invention;

[0027] Figure 10 It is a three-dimensional schematic diagram of the web clamping block of the present invention.

[0028] In the figure: 1 is an outer sleeve, 2 is an inner sleeve, 3 is a liquid storage tank, 4 is a first return pipe, 5 is a water suction pipe, 6 is a sieve plate, 7 is a through hole, 8 is a wind cap, 9 is an air inlet pipe, 10 is an annular water delivery pipe, 11 is a spray head, 12 is a filter cup, 13 is a cup cover, 14 is a filter net, 15 is a pull rope, 16 is a baffle, 17 is a heating rod, 18 is a cooling box, 19 is a cooling pipe, 20 is a second return pipe, 21 is a valve, 22 is a cover plate, 23 is a locking ring, 24 is a sealing ring, 25 is an annular clamping platform, 26 is a support ring, 27 is a limiting ring, 28 is a collection cavity, 29 is a blowing assembly, 30 is a filtering assembly, 31 is a cooling assembly, 32 is a support rod, 33 is a bracket, 34 is a gear ring, 35 is a motor, 36 is a gear, 37 is a bottom plate, 38 is a top plate, 39 is a first guide rod, 40 is a lead screw, 41 is a first clamping block, 42 is a second clamping block, 43 is a clamping block, 44 is a clamping groove, 45 is a first avoidance groove, 46 is a second avoidance groove, 47 is a limiting groove, 48 is a limiting block, 49 is a connecting plate, 50 is a clamping plate, 51 is a clamping groove, 52 is an outer clamping block, 53 is a web clamping block, 54 is an inner clamping block, 55 is a first threaded column, 56 is a second threaded column, 57 is a third threaded column, 58 is a fixing block, 59 is a locking nut, 60 is a sliding strip, 61 is a sliding groove, 62 is a second guide rod, 63 is a third guide rod. Detailed implementation manners

[0029] The following further describes in detail the implementation manners of the present invention in conjunction with the drawings and embodiments. The following embodiments are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0030] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0031] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", "connected" 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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0032] AsFigure 1 , Figure 2 and Figure 6 As shown in Figure 2 , Figure 6 , a torsional fatigue test system for a steel sheet pile after corrosion includes a corrosion device and a torsion device. The corrosion device includes a corrosion component and a liquid storage tank 3. A steel sheet pile is inserted into the corrosion component. The corrosion component and the liquid storage tank 3 are connected by a circulation component, so that the liquid in the liquid storage tank 3 enters the corrosion component through the circulation component and flows back from the corrosion component to the liquid storage tank 3. A blowing component 29 is also provided on the corrosion component; the corrosion component includes an outer sleeve 1 and an inner sleeve 2. Both the outer sleeve 1 and the inner sleeve 2 are tubular structures with open upper ends. The bottom of the outer sleeve 1 is fixedly arranged on the ground. A hole is opened on the ground at the bottom of the outer sleeve 1 for placing the liquid storage tank 3. The diameter of the inner sleeve 2 is smaller than that of the outer sleeve 1. The lower end of the inner sleeve 2 is fixedly arranged on the bottom surface of the outer sleeve 1. The inner sleeve 2 and the outer sleeve 1 are coaxially arranged and are connected and communicated with each other, so that the liquid can enter the inner sleeve 2 from the outer sleeve 1. The inner sleeve 2 is filled with soil, and the soil composition is the same as that of the soil in the ocean and can be proportioned according to different regions. A steel sheet pile is inserted into the soil. A blowing component 29 is arranged above the inner sleeve 2 and can blow air into the inner sleeve 2 to simulate the dry state of the soil during ebb tide;

[0033] The torsion device includes a bracket 33. Clamping components are rotatably arranged at both the upper end and the lower end of the bracket 33. A gear ring 34 is sleeved outside the clamping component. The gear ring 34 and the clamping component are detachably and fixedly connected, and the clamping component can rotate synchronously with the gear ring 34. Teeth are provided on the outer circumferential surface of the gear ring 34. A motor 35 is fixedly arranged on the bracket 33. There are at least two motors 35, and multiple motors 35 are evenly distributed at the upper end and the lower end of the bracket 33, and the rotation directions of the motors 35 at the upper end and the lower end of the bracket 33 are opposite. A gear 36 is fixedly arranged on the output shaft of the motor 35, and the motor 35 can drive the gear 36 to rotate. The gear 36 meshes with the gear ring 34.

[0034] In the present invention, first, the steel sheet pile is inserted into the soil in the corrosion component, and the liquid in the liquid storage tank 3 is conveyed to the corrosion component through the circulation component to moisten the soil. The liquid composition can simulate the seawater composition, and the soil composition can simulate the soil composition in seawater. As the soil is moistened, the liquid in the soil corrodes the steel sheet pile. After a certain period of corrosion, the liquid in the corrosion component is refluxed to the liquid storage tank 3 through the circulation component, and the blowing component 29 blows air to the soil in the corrosion component to simulate the sea breeze state and dry the soil. After repeating the above steps, the steel sheet pile is taken out and placed in the torsion device, and both ends of the steel sheet pile are fixedly connected to the clamping components at the upper and lower ends of the bracket 33 respectively. The motor 35 drives the gear 36 to rotate, so that the gear ring 34 and the clamping components rotate, thereby enabling the torsion fatigue test of the steel sheet pile. After torsion for a certain number of times, the steel sheet pile breaks, and recording the number of breaks can obtain the torsion fatigue life of the corroded steel sheet pile, thus providing theoretical data for the repeated service life of the steel sheet pile.

[0035] It should be noted that during the torsion of the steel sheet pile, the torsion angle can be respectively in the range of 0° to 45°, and a torsion fatigue test experiment is carried out every 5°. For example, torsion is carried out at a torsion angle of 5° until the steel sheet pile breaks; then torsion is carried out under the condition of a torsion angle of 10° until the steel sheet pile breaks, and the torsion test is continuously carried out according to this condition.

[0036] Furthermore, the outer sleeve 1, the inner sleeve 2, and the sieve plate 6 are all made of corrosion-resistant materials, such as engineering plastics or stainless steel, etc. Scales are provided on the barrel walls of the outer sleeve 1 and the inner sleeve 2 to facilitate observing the height of the liquid.

[0037] Furthermore, a sieve plate 6 is fixedly arranged in the inner sleeve 2. The sieve plate 6 is horizontally arranged in the inner sleeve 2. There is a certain gap between the sieve plate 6 and the bottom plate of the inner sleeve 2 for the passage of the liquid. The sieve plate 6 is used to carry the soil, and the soil in the inner sleeve 2 accumulates on the sieve plate 6. A plurality of sieve holes are provided on the sieve plate 6. Since the aperture of the sieve holes is small, the sieve holes can be used for the passage of the liquid while preventing the soil from falling through the sieve holes to the lower part of the sieve plate 6. A plurality of through holes 7 are provided on the side wall of the inner sleeve 2, and the through holes 7 are located below the sieve plate 6. In this embodiment, the liquid extracted from the liquid storage tank 3 through the water extraction pipe 5 can enter the inner sleeve 2 through the through holes 7 after entering the outer sleeve 1, and then enter the soil above the sieve plate 6 through the sieve holes on the sieve plate 6 to moisten the soil in the inner sleeve 2, thereby simulating the state during high tide; while simulating the ebb tide state, the water pump on the water extraction pipe 5 stops pumping water, and the liquid in the outer sleeve 1 is refluxed to the liquid storage tank 3 through the first reflux pipe 4 to empty the liquid in the outer sleeve 1. At the same time, the moisture in the inner sleeve 2 can also flow back to the outer sleeve 1 through the sieve holes on the sieve plate 6 and the through holes 7, and finally the liquid is emptied to simulate the dry state of the soil during ebb tide.

[0038] In one embodiment, the sieve plate 6 is fixedly welded to the inner wall of the inner sleeve 2, so that the sieve plate 6 is fixedly connected to the inner sleeve 2.

[0039] In another embodiment, an annular groove is formed on the inner wall of the inner sleeve 2, and the edge of the sieve plate 6 is clamped in the annular groove, thereby fixedly connecting the sieve plate 6 and the inner sleeve 2.

[0040] Furthermore, as Figure 3 shown, the blowing assembly 29 includes a wind cap 8. The wind cap 8 is a cylindrical structure with an open lower end. The wind cap 8 covers the upper part of the inner sleeve 2. The diameter of the wind cap 8 is larger than that of the inner sleeve 2. Therefore, there is a gap between the wind cap 8 and the inner sleeve 2. The upper end of the wind cap 8 is connected with an air inlet pipe 9 for blowing air into the inner sleeve 2. When the tide ebbs and the soil is exposed above the water surface, the sea breeze blows over the soil. When the sea breeze blows, only the sandy soil on the upper layer of the soil can be dried, and the sandy soil on the lower layer of the soil cannot be blown, so it will still be in a wet state. And the steel sheet pile corrodes more seriously in this semi-dry and semi-wet state. And in this embodiment, the above state is simulated. The air inlet pipe 9 blows air into the wind cap 8 and blows it downward to the soil, so that the air contacts the soil in the inner sleeve 2. At the same time, since the air cannot be discharged through the soil, and there is a gap between the wind cap 8 and the inner sleeve 2, the air is discharged from the gap between the wind cap 8 and the inner sleeve 2. Therefore, the upper layer of the soil in the inner sleeve 2 can be dried, while the lower layer of the soil is still in a wet state.

[0041] Furthermore, a plurality of support rods 32 are fixedly arranged at the bottom of the wind cap 8. The plurality of support rods 32 are evenly arranged in the circumferential direction. A clamping groove is formed at the lower end of the support rod 32. When the wind cap 8 covers the inner sleeve 2, the lower end of the support rod 32 abuts against the upper end of the inner sleeve 2, and the upper end of the inner sleeve 2 is clamped in the clamping groove of the support rod 32, so that there is a certain gap between the inner sleeve 2 and the wind cap 8. When blowing air into the inner sleeve 2, the air entering the inner sleeve 2 can be discharged from the gap between the inner sleeve 2 and the wind cap 8.

[0042] It should be noted that the air inlet pipe 9 includes an air inlet main pipe and a plurality of air inlet branch pipes. The plurality of air inlet branch pipes are all connected to the air inlet main pipe. The plurality of air inlet branch pipes are evenly arranged at the upper end of the wind cap 8, which can make the blown air more uniform. One end of the air inlet main pipe is connected with a hair dryer; at the same time, a heating plate is also arranged in the air inlet main pipe. Through the heating of the heating plate, the blown air can be heated, and the temperature of the sea breeze in different seasons can be simulated, so as to obtain more accurate data.

[0043] Further, an annular water delivery pipe 10 is fixedly arranged on the inner wall of the outer sleeve 1. The annular water delivery pipe 10 is located in the upper part of the outer sleeve 1 and is connected to the water extraction pipe 5. A plurality of nozzles 11 are arranged on the annular water delivery pipe 10. The plurality of nozzles 11 are evenly arranged along the circumferential direction and are used for spraying water towards one side of the inner sleeve 2. The water outlet of the nozzle 11 is inclined downward and towards one side of the inner sleeve 2, and the inclination angle of the water outlet of the nozzle 11 is 45 degrees. After the liquid is sprayed out through the nozzle 11, it can also wash the sediment adhering to the wall of the inner sleeve 2, so that the inner sleeve 2 is kept clean.

[0044] Further, as Figure 4 shown, in order to prevent the sediment in the outer sleeve 1 from entering the liquid storage tank 3 through the first return pipe 4, a filtering component 30 is arranged on the first return pipe 4 for filtering the sediment. The filtering component 30 includes a filtering cup 12. The filtering cup 12 is a cylindrical structure with an open upper end. A water outlet end is arranged at the center of the lower end of the filtering cup 12. A cup cover 13 is fixedly arranged at the top of the filtering cup 12. An inlet end is arranged at the center of the cup cover 13. A filter screen 14 is arranged in the filtering cup 12. The filter screen 14 is a frustum-shaped structure with a larger diameter at the upper part and a smaller diameter at the lower part. The upper end of the filter screen 14 is an open structure. The filter screen 14 and the filtering cup 12 are coaxially arranged. A filter paper is laid on the inner wall of the filter screen 14. In this embodiment, the liquid enters the filtering cup 12 from the inlet end of the cup cover 13 and falls into the filter screen 14. After being filtered by the filter paper, the clean liquid falls to the bottom of the filtering cup 12 and is discharged from the water outlet end at the bottom of the filtering cup 12 and enters the liquid storage tank 3.

[0045] Further, an external thread is arranged at the upper end of the filtering cup 12. The cup cover 13 includes a cover plate 22 and a locking ring 23 fixedly arranged on the lower end face of the cover plate 22. Internal threads adapted to the external thread on the filtering cup 12 are arranged on the inner wall of the locking ring 23. Therefore, the filtering cup 12 and the locking ring 23 are threadedly connected, so that the filtering cup 12 and the cup cover 13 are fixedly connected; a sealing ring 24 is arranged between the filtering cup 12 and the cover plate 22 for sealing between the filtering cup 12 and the cover plate 22 to prevent liquid leakage.

[0046] Further, an annular clamping platform 25 is fixedly arranged at the upper part of the inner wall of the filtering cup 12. A supporting ring 26 is arranged at the upper end of the filter screen 14. The supporting ring 26 is placed on the annular clamping platform 25. A limiting ring 27 is also fixedly arranged on the lower end face of the cover plate 22. When the cup cover 13 and the filtering cup 12 are fixedly connected, the side wall of the filtering cup 12 is located between the locking ring 23 and the limiting ring 27. At the same time, the limiting ring 27 presses the supporting ring 26 against the annular clamping platform 25 to prevent the filter screen 14 from shaking in the filtering cup 12.

[0047] Further, in order to prevent liquid from falling from the water inlet end of the cup cover 13 onto the filter screen 14 and causing damage to the filter paper by impact, a plurality of drawstrings 15 are evenly arranged along the circumferential direction on the cup cover 13. The drawstrings 15 are made of elastic materials, such as rubber bands or springs. One end of the drawstring 15 is fixedly arranged on the lower end surface of the cover plate 22, and the other end of the drawstring 15 is fixedly connected with a baffle 16. The baffle 16 is located at the center of the cup cover 13 and directly below the water inlet end of the cup cover 13. The baffle 16 is of a circular structure. When the liquid falls from the water inlet end of the cup cover 13, it can fall onto the baffle 16. The baffle 16 can play a buffering role. The liquid falls onto the filter screen 14 from the edge of the baffle 16. At the same time, the drawstring 15 has a certain elasticity. The water flow impacts the baffle 16, causing the baffle 16 to move downward, making the distance between the baffle 16 and the filter paper closer, so as to slow down the impact of the water flow on the filter paper and avoid damage to the filter paper.

[0048] Further, a plurality of heating rods 17 are arranged inside the inner sleeve 2. The heating rods 17 are inserted into the soil. When the heating rods 17 are heating, they can increase the temperature of the liquid and the soil, so as to simulate the environment with a higher temperature in summer.

[0049] Further, as Figure 2 and Figure 5 shown, a cooling assembly 31 is arranged on the water extraction pipe 5. The cooling assembly 31 includes a cooling box 18. The cooling box 18 is communicated with the water extraction pipe 5. The cooling box 18 is provided with a water inlet end and a water outlet end. When the water extraction pipe 5 extracts the liquid in the liquid storage tank 3, the liquid can flow into the cooling box 18 from the water inlet end and flow out from the water outlet end. A cooling pipe 19 is arranged inside the cooling box 18. The cooling pipe 19 is of a spiral structure, which can increase the contact area between the cooling pipe 19 and the liquid inside the cooling box 18. Cooling water flows inside the cooling pipe 19, which is used to cool the liquid inside the cooling box 18 and reduce the liquid temperature, so as to simulate the environment with a lower temperature in winter.

[0050] Further, a second return pipe 20 is also connected between the outer sleeve 1 and the liquid storage tank 3. One end of the second return pipe 20 is connected to the outer sleeve 1, and the other end is connected to the liquid storage tank 3. A valve 21 is arranged on the second return pipe 20. The valve 21 is a butterfly valve or a gate valve. In this embodiment, when discharging the liquid inside the outer sleeve 1, in order to accelerate the discharging speed, the valve 21 on the second return pipe 20 can be opened, and the liquid inside the outer sleeve 1 can be discharged from both the first return pipe 4 and the second return pipe 20 simultaneously, so as to accelerate the drainage speed.

[0051] Furthermore, a collection chamber 28 is provided inside the outer sleeve 1. The collection chamber 28 is located below the inner sleeve 2 and surrounds the inner sleeve 2. The collection chamber 28 is used to collect the sediment entering the outer sleeve 1. One end of the first return pipe 4 is connected to the bottom of the collection chamber 28. Since the sediment deposits at the bottom of the collection chamber 28, when the liquid in the outer sleeve 1 enters the liquid storage tank 3 through the first return pipe 4, the sediment can be filtered by the filter assembly 30, making the liquid entering the liquid storage tank 3 cleaner; One end of the second return pipe 20 is connected to the upper part of the collection chamber 28, and the end of the second return pipe 20 connected to the collection chamber 28 is located below the inner sleeve 2. Since the sediment deposits at the bottom of the collection chamber 28, the liquid above the collection chamber 28 is relatively clean. After the valve 21 of the second return pipe 20 is opened, the liquid closer to the upper part of the collection chamber 28 can be discharged from the second return pipe 20, accelerating the discharge speed and at the same time preventing sediment from entering the liquid storage tank 3.

[0052] Furthermore, a stirring assembly is provided on the liquid storage tank 3. The stirring assembly includes a stirring shaft and stirring blades. One end of the stirring shaft is rotatably arranged on the liquid storage tank 3. The stirring shaft can be driven to rotate by a motor fixedly arranged on the liquid storage tank 3. The other end of the stirring shaft extends into the liquid storage tank 3. The stirring blades are fixedly arranged at one end of the stirring shaft located inside the liquid storage tank 3. When the stirring shaft rotates, it drives the stirring blades to rotate, stirring the liquid in the liquid storage tank 3; When preparing the liquid mixture, in order to simulate the composition of seawater, substances such as brine need to be added to the liquid. Through the stirring of the stirring blades, the liquid in the liquid storage tank 3 can be quickly mixed evenly.

[0053] Furthermore, an oxygenation pump is also connected to the liquid storage tank 3, which is used to oxygenate the liquid in the liquid storage tank 3, so as to be able to prepare the liquid for simulating seawater.

[0054] When simulating the corrosion environment of sheet piles, the following steps can be carried out:

[0055] S1. First, configure the liquid in the liquid storage tank 3. Add oxygen to the liquid in the liquid storage tank 3 through an aeration pump to form a 5% saturated sodium chloride brine in the liquid storage tank 3. Extract and transport the liquid in the liquid storage tank through a water suction pipe to the outer sleeve. The liquid extracted by the water suction pipe enters the annular water delivery pipe and then sprays out from the nozzle. The nozzle faces one side of the inner sleeve wall, which can wash the sediment adhering to the inner sleeve wall clean. As the water suction pipe continuously pumps the liquid in the liquid storage tank into the outer sleeve until it fills 2 / 3 of the internal volume of the outer sleeve, the liquid can wet the soil through the through holes and the sieve plate of the inner sleeve; while pumping water from the liquid storage tank, the liquid in the outer sleeve can also flow back to the liquid storage tank through the first return pipe, enabling the liquid to complete a cycle; since a filtering component is provided on the first return pipe, the return speed of the first return pipe is relatively slow, and the extraction speed of the water suction pipe is greater than the return speed of the first return pipe. Therefore, the liquid in the outer sleeve can rise rapidly until the liquid in the outer sleeve rises to 2 / 3 of the internal volume of the outer sleeve. Then, lower the water pump flow rate on the water suction pipe to make the water extraction speed of the water suction pipe the same as the drainage speed from the first return pipe, maintaining the stable volume of the liquid in the outer sleeve;

[0056] S2. After soaking for a certain time, open the valve on the second return pipe. The single soaking time is 12 hours, so that the liquid in the outer sleeve flows back to the liquid storage tank through the first return pipe and the second return pipe, emptying the liquid in the outer sleeve;

[0057] S3. Blow air into the inside of the inner sleeve through the air inlet pipe to dry the soil inside the inner sleeve;

[0058] S4. Repeat the above steps. The number of cycles can be selected according to different materials. Specifically, refer to the following table. Multiple numbers of cycles can also be set for each model to obtain more accurate experimental data:

[0059]

[0060] Furthermore, as Figure 6As shown, the bracket 33 includes a bottom plate 37 and a top plate 38. The bottom plate 37 and the top plate 38 are arranged in parallel. A plurality of first guide rods 39 are fixedly arranged at the edge of the bottom plate 37. The first guide rods 39 are arranged vertically. The top plate 38 is slidably arranged on the first guide rods 39. A scale is provided along the length direction on the outer wall of the first guide rods 39 for marking the height of the top plate 38. A lead screw 40 is rotatably arranged on the bottom plate 37. A lead screw nut is arranged on the top plate 38. The lead screw nut on the top plate 38 is threadedly connected with the lead screw 40. By rotating the lead screw 40, the top plate 38 can be raised or lowered, so as to adjust the distance between the bottom plate 37 and the top plate 38 to adapt to steel sheet piles of different lengths. The clamping assemblies are respectively rotatably arranged on the bottom plate 37 and the top plate 38. Similarly, the motor 35 is fixedly arranged on the bottom plate 37 and the top plate 38 to drive the clamping assemblies to rotate on the bottom plate 37 and the top plate 38, so as to twist the steel sheet pile.

[0061] In one embodiment, as Figure 7 and Figure 8 shown, the clamping assembly includes a first clamping block 41 and a second clamping block 42. Both the first clamping block 41 and the second clamping block 42 are semi-circular structures. A clamping block 43 is arranged on the first clamping block 41. The two side walls of the clamping block 43 are inclined, which are adapted to the inclined angles of the two side plates of the steel sheet pile. A clamping groove 44 is arranged on the second clamping block 42. The two side walls of the clamping groove 44 are inclined, which are also adapted to the inclined angles of the two side plates of the steel sheet pile. When the first clamping block 41 and the second clamping block 42 are closed, the clamping block 43 is clamped in the clamping groove 44 to clamp the steel sheet pile. The gear ring 34 is sleeved on the first clamping block 41 and the second clamping block 42. In this embodiment, the end of the steel sheet pile is arranged between the first clamping block 41 and the second clamping block 42. As the first clamping block 41 and the second clamping block 42 are closed, the steel sheet pile is clamped in the clamping groove 44. The side wall of the clamping groove 44 is attached to the steel sheet pile. At the same time, when the clamping block 43 is clamped in the clamping groove 44, the steel sheet pile can be clamped and fixed. When the first clamping block 41 and the second clamping block 42 are closed, they form a circular structure. Then, the gear ring 34 is sleeved outside the first clamping block 41 and the second clamping block 42. The gear ring 34 meshes with the gear 36. As the gear 36 drives the gear ring 34 to rotate, the end of the steel sheet pile rotates, so as to perform a torsion test on the steel sheet pile.

[0062] Furthermore, a first avoidance groove 45 is arranged at one end of the clamping groove 44 close to the first clamping block 41. A second avoidance groove 46 is arranged at the bottom end of the clamping block 43. When the first clamping block 41 and the second clamping block 42 are closed, the first avoidance groove 45 and the second avoidance groove 46 are communicated. The locking port on the steel sheet pile is located inside the first avoidance groove and the second avoidance groove, preventing the locking port from interfering with the first locking block 9 and the second locking block 10.

[0063] Further, the thicknesses of the first clamping block 41 and the second clamping block 42 are greater than the thickness of the gear ring 34. After the gear ring 34 is sleeved on the first clamping block 41 and the second clamping block 42, the gear ring 34 is located above the first clamping block 41 and the second clamping block 42. Rotation holes are formed in the bottom plate 37 and the top plate 38, and the lower parts of the first clamping block 41 and the second clamping block 42 are rotatably arranged in the rotation holes. At this time, the gear ring 34 can also prevent the first clamping block 41 and the second clamping block 42 from falling out of the rotation holes.

[0064] Further, a plurality of limiting grooves 47 are uniformly arranged on the outer circumferential surfaces of the first clamping block 41 and the second clamping block 42, and a plurality of limiting blocks 48 are arranged on the inner ring of the gear ring 34. The limiting blocks 48 are clamped in the limiting grooves 47, which can prevent relative rotation between the gear ring 34, the first clamping block 41 and the second clamping block 42.

[0065] Further, the first clamping block 41 and the second clamping block 42 are fixedly connected through a plurality of connecting plates 49. Specifically, threaded holes are formed in the upper end surfaces of the first clamping block 41 and the second clamping block 42, and two bolts are rotatably arranged on the connecting plate 49. One bolt on the connecting plate 49 is threadedly connected to the threaded hole on the first clamping block 41, and the other bolt is threadedly connected to the threaded hole on the second clamping block 42, thereby fixedly connecting the first clamping block 41 and the second clamping block 42.

[0066] In another embodiment, as Figure 9 and Figure 10 shown, the clamping assembly includes a clamping plate 50. The clamping plate 50 is of a circular structure and is rotatably arranged on the bracket 33. The gear ring 34 is sleeved on the outer circumferential surface of the clamping plate 50. A clamping groove 51 is formed in the middle of the clamping plate 50. An outer clamping block 52, a web clamping block 53 and an inner clamping block 54 are arranged in the clamping groove 51. The outer clamping block 52 is horizontally slidably arranged in the clamping groove 51. There are two outer clamping blocks 52, which are symmetrically arranged along the vertical central plane of the clamping plate 50. The two outer clamping blocks 52 can slide in directions approaching or separating from each other. The mutually approaching sides of the two outer clamping blocks 52 are inclined and are adapted to the two side walls of the steel sheet pile. The web clamping block 53 is horizontally slidably arranged between the two outer clamping blocks 52. The sliding direction of the web clamping block 53 is perpendicular to the sliding direction of the outer clamping block 52. The inner clamping block 54 is horizontally slidably arranged on the web clamping block 53. There are two inner clamping blocks 54, which are symmetrically arranged along the vertical central plane of the clamping plate 50. The two inner clamping blocks 54 can slide in directions approaching or separating from each other. The sides of the two inner clamping blocks 54 close to the outer clamping blocks 52 are inclined and are adapted to the two side walls of the steel sheet pile.

[0067] In this embodiment, the end of the steel sheet pile is arranged in the clamping groove 51. The two outer clamping blocks 52 are located on both sides of the steel sheet pile. As the two outer clamping blocks 52 slide towards the side close to each other, the two sides of the steel sheet pile can be clamped. At the same time, the web clamping block 53 slides towards the side close to the steel sheet pile to clamp the inner web of the steel sheet pile, and the two inner clamping blocks 54 slide in the direction away from each other to clamp and fix the two side walls of the steel sheet pile. With the combined action of the outer clamping block 52, the web clamping block 53 and the inner clamping block 54, the end of the steel sheet pile is clamped and fixed.

[0068] Furthermore, a relief groove is provided on the side surfaces of the outer clamping blocks 52 close to each other. The locking groove of the steel sheet pile is clamped in the relief groove, which can prevent the interference of the locking groove on the outer clamping blocks 52.

[0069] Furthermore, the thickness of the clamping plate 50 is greater than the thickness of the gear ring 34. After the gear ring 34 is sleeved on the clamping plate 50, the gear ring 34 is located at the upper part of the clamping plate 50. Rotation holes are provided on the bottom plate 37 and the top plate 38. The lower part of the clamping plate 50 is rotatably arranged in the rotation holes, and the gear ring 34 can prevent the clamping plate 50 from falling out of the rotation holes.

[0070] Furthermore, a plurality of limiting grooves 47 are evenly arranged on the outer circumferential surface of the clamping plate 50 along the circumferential direction, and a plurality of limiting blocks 48 are evenly arranged on the inner circumferential surface of the gear ring 34 along the circumferential direction. After the gear ring 34 is sleeved on the clamping plate 50, the limiting blocks 48 are clamped in the limiting grooves 47 to prevent relative rotation between the gear ring 34 and the clamping plate 50.

[0071] Furthermore, a first threaded column 55 and a second threaded column 56 are rotatably arranged on the clamping plate 50. The first threaded column 55 and the second threaded column 56 are both horizontally arranged in the clamping groove 51, and the length directions of the first threaded column 55 and the second threaded column 56 are perpendicular. The first threaded column 55 is threadedly connected to the outer clamping block 52, and the outer clamping block 52 slides in the clamping groove 51 by rotating the first threaded column 55; the second threaded column 56 is threadedly connected to the web clamping block 53, and the web clamping block 53 slides in the clamping groove 51 by rotating the second threaded column 56; a third threaded column 57 is arranged between the two inner clamping blocks 54. The third threaded column 57 is provided with a double thread and is threadedly connected to the two inner clamping blocks 54 respectively. Therefore, when the third threaded column 57 is rotated, the two inner clamping blocks 54 can slide in the direction close to or away from each other.

[0072] Furthermore, fixing blocks 58 are fixedly arranged on the first threaded post 55, the second threaded post 56 and the third threaded post 57. The fixing blocks 58 are in a hexagonal structure, which is convenient for the wrench to clamp. By clamping the fixing blocks 58 with a wrench, the first threaded post 55, the second threaded post 56 and the third threaded post 57 can be driven to rotate, and the fixing block 58 on the third threaded post 57 is located in the middle of the third threaded post 57. In addition, locking nuts 59 are threadedly connected to the first threaded post 55, the second threaded post 56 and the third threaded post 57. Two locking nuts 59 are symmetrically arranged on the third thread 23. After the positions of the outer clamping block 52, the web clamping block 53 and the inner clamping block 54 are adjusted, the outer clamping block 52, the web clamping block 53 and the inner clamping block 54 can be locked and fixed by rotating the locking nuts 59.

[0073] Furthermore, as Figure 10 shown, a slide bar 60 is arranged on the web clamping block 53, and a chute 61 is arranged on the inner clamping block 54. The slide bar 60 is located in the chute 61 to limit the inner clamping block 54 when it slides along the upper end surface of the web clamping block 53, so that the inner clamping block 54 can only slide along the length direction of the slide bar 60.

[0074] Furthermore, a second guide rod 62 and a third guide rod 63 are fixedly arranged in the clamping groove 51. The second guide rod 62 is arranged parallel to the first threaded post 55, and the outer clamping block 52 is slidably arranged on the second guide rod 62. The third guide rod 63 is arranged parallel to the second threaded post 56, and the web clamping block 53 is slidably arranged on the third guide rod 63, which can prevent the outer clamping block 52 and the web clamping block 53 from rotating in the clamping groove 51.

[0075] Furthermore, the thickness of the web clamping block 53 is smaller than the thickness of the outer clamping block 52.

[0076] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A torsional fatigue test system for corroded steel sheet piles, characterized in that, It includes a corrosion device and a torsion device. The corrosion device includes a corrosion component and a liquid storage tank. A steel sheet pile is inserted into the corrosion component. The corrosion component and the liquid storage tank are connected by a circulation component. A blowing component is also arranged on the corrosion component. The torsion device includes a bracket. Clamping components are rotatably arranged at both the upper end and the lower end of the bracket. A gear ring is fixedly arranged on the clamping component. Teeth are arranged on the outer circumferential surface of the gear ring. A motor is fixedly arranged on the bracket. The motor is drivingly connected with a gear, and the gear meshes with the gear ring.

2. The torsional fatigue test system for a steel sheet pile after corrosion according to claim 1, wherein The corrosion component includes an outer sleeve. An inner sleeve is fixedly arranged inside the outer sleeve. The inner sleeve is communicated with the outer sleeve. Soil is filled in the inner sleeve. A steel sheet pile is inserted into the soil. The blowing component is arranged above the inner sleeve and is used for blowing air into the inner sleeve.

3. The torsional fatigue test system for corroded steel sheet piles according to claim 2, characterized in that, A sieve plate is fixedly arranged inside the inner sleeve for carrying the soil. A plurality of through holes are formed in the side wall of the inner sleeve, and the through holes are located below the sieve plate.

4. A torsional fatigue test system for a steel sheet pile after corrosion according to claim 1, characterized in that The blowing component includes a wind cap. The wind cap is arranged above the inner sleeve. A gap is left between the wind cap and the inner sleeve. An air inlet pipe is connected to the wind cap for blowing air into the inner sleeve.

5. A torsional fatigue test system for a steel sheet pile after corrosion according to claim 2, characterized in that, The circulation component includes a water suction pipe and a first return pipe. One end of the water suction pipe is connected to the liquid storage tank, and the other end is connected to the upper part of the outer sleeve. One end of the first return pipe is connected to the liquid storage tank, and the other end is connected to the bottom of the outer sleeve.

6. The torsional fatigue test system for a steel sheet pile after corrosion according to claim 5, characterized in that, A filtering component is arranged on the first return pipe. The filtering component includes a filtering cup. A cup cover is fixedly arranged at the top of the filtering cup. A filter screen is arranged inside the filtering cup, and filter paper is laid on the inner wall of the filter screen.

7. A torsional fatigue test system for steel sheet piles after corrosion according to claim 1, characterized in that, The clamping component includes a first clamping block and a second clamping block. Both the first clamping block and the second clamping block are semi-circular structures. A clamping block is arranged on the first clamping block, and the two side walls of the clamping block are inclined. A clamping groove is arranged on the second clamping block, and the two side walls of the clamping groove are inclined. When the first clamping block and the second clamping block are closed, the clamping block is clamped in the clamping groove to clamp the steel sheet pile. The gear ring is sleeved on the first clamping block and the second clamping block.

8. A torsional fatigue test system for a steel sheet pile after corrosion according to claim 1, characterized in that The clamping component includes a clamping plate. The clamping plate is rotatably arranged on the bracket. The gear ring is sleeved on the clamping plate. A clamping groove is formed in the clamping plate. An outer clamping block, a web clamping block and an inner clamping block are arranged in the clamping groove. The outer clamping block is slidably arranged in the clamping groove. There are two outer clamping blocks which are symmetrically arranged. The web clamping block is slidably arranged between the two outer clamping blocks. The inner clamping block is slidably arranged on the web clamping block. There are two inner clamping blocks which are symmetrically arranged.

9. A torsional fatigue test system for steel sheet piles after corrosion according to claim 8, characterized in that A first threaded column and a second threaded column are rotatably arranged on the clamping plate. The first threaded column is threadedly connected with the outer clamping block. The second threaded column is threadedly connected with the web clamping block. A third threaded column is arranged between the two inner clamping blocks. The third threaded column is provided with a double thread and is respectively threadedly connected with the two inner clamping blocks.

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