Axial compression test device and method for bent submarine cable

Abstract

The invention relates to an axial compression test device and method for a bent submarine cable, and the device comprises a test bench, a first positioning assembly, a second positioning assembly, a first pressure-bearing assembly, a second pressure-bearing assembly and a plurality of pre-tightening assemblies, the test bench is used for supporting a tested sample cable, the first positioning assembly comprises a plurality of first positioning columns, and the second positioning columns comprise a plurality of second positioning columns; the first positioning assembly comprises a plurality of first positioning columns, the second positioning assembly comprises a plurality of second positioning columns, the first pressure-bearing assembly comprises a first pressure-bearing inner baffle plate, a pressure applying part and a first pressure-bearing outer baffle plate, the second pressure-bearing assembly comprises a second pressure-bearing inner baffle plate, a pressure measuring part and a second pressure-bearing outer baffle plate, and the plurality of pre-tightening assemblies are arranged around the longitudinal axis of the tested sample cable. According to the invention, the tested sample cable is positioned in a posture with a set curvature, pressure is applied and measured to the tested sample cable through the first pressure-bearing assembly and the second pressure-bearing assembly, an axial compression test can be carried out on a submarine cable with a curvature (bending radius), and guiding significance is provided for submarine cable laying.

Description

Technical Field

[0001] The invention relates to the technical field of submarine cable testing, and in particular to an axial compression test device and method for a bent submarine cable. Background Art

[0002] When laying submarine cables, the cable-laying ship passes through the arc of the launching bridge and then slowly lowers them to the seabed. The laid submarine cables form a catenary shape on the seabed. Due to the influence of waves, the submarine cables suspended in the sea will shake, during which they will be subjected to axial tension. In the case of severe shaking, they will be subjected to axial compression. Laying submarine cables in harsh marine environments will have a destructive effect on the submarine cables. In order to ensure the life of the submarine cables, the compression and compressive force capabilities of the submarine cables need to be actually tested. Due to current equipment reasons, there is no effective testing equipment and method for the axial pressure of submarine cables, especially for submarine cables with curvature. How to perform axial compression tests on curved submarine cables is a technical problem that needs to be solved urgently in this field. Summary of the invention

[0003] To this end, the present invention provides an axial compression test device and method for a bent submarine cable, which can perform an axial compression test on the bent submarine cable.

[0004] In order to solve the above technical problems, the present invention provides an axial compression test device for a bent submarine cable, comprising: A test bench, the test bench is used to be supported below the sample cable to be tested; A first positioning assembly, the first positioning assembly comprising a plurality of first positioning posts abutting against a curved side of the cable under test; A second positioning assembly, the second positioning assembly comprising a plurality of second positioning posts abutting against a side of the tested sample cable facing away from the first positioning assembly; A first pressure-bearing component, the first pressure-bearing component comprises a first pressure-bearing inner baffle plate, a pressure-applying component and a first pressure-bearing outer baffle plate, the first pressure-bearing inner baffle plate is arranged at one end of the length direction of the tested sample cable, the pressure-applying component is arranged at a side of the first pressure-bearing inner baffle plate away from the tested sample cable, the pressure-applying component is used to apply thrust to the first pressure-bearing inner baffle plate, and the first pressure-bearing outer baffle plate is arranged at a side of the pressure-applying component away from the first pressure-bearing inner baffle plate; A second pressure-bearing component, the second pressure-bearing component comprises a second pressure-bearing inner baffle plate, a pressure-measuring component and a second pressure-bearing outer baffle plate, the second pressure-bearing inner baffle plate is arranged at the other end of the length direction of the measured sample cable, the pressure-measuring component is arranged at a side of the second pressure-bearing inner baffle plate away from the measured sample cable, the pressure-measuring component is used to detect the pressure received by the second pressure-bearing inner baffle plate and output the pressure, and the second pressure-bearing outer baffle plate is arranged at a side of the pressure-measuring component away from the second pressure-bearing inner baffle plate; A plurality of pre-tensioning components are arranged around the longitudinal axis of the test cable, the pre-tensioning components include a steel wire rope, a first rope end fixing structure and a second rope end fixing structure, the steel wire rope passes through the first pressure-bearing outer baffle plate, the first pressure-bearing inner baffle plate, the test cable, the second pressure-bearing inner baffle plate and the second pressure-bearing outer baffle plate, the first rope end fixing structure is connected or abuts against a side of the first pressure-bearing outer baffle plate away from the pressure-applying component and is fixedly connected to one end of the steel wire rope, the second rope end fixing structure is connected or abuts against a side of the second pressure-bearing outer baffle plate away from the pressure-measuring component and is fixedly connected to the other end of the steel wire rope.

[0005] Furthermore, a plurality of positioning grooves are arranged in sequence along a first direction and spaced apart from each other on the surface of the test bench, each positioning groove extends along a second direction, each positioning groove has a first groove end and a second groove end in the second direction, and the second direction is perpendicular to the first direction; The plurality of first positioning posts are respectively connected to the plurality of positioning grooves in an adjustable manner along the second direction; The plurality of second positioning posts are respectively connected to the plurality of positioning grooves in an adjustable manner along the second direction; In the same positioning groove, the first positioning column is close to the first groove end, and the second positioning column is close to the second groove end.

[0006] Furthermore, the first positioning column is connected to the positioning groove in an adjustable height, and the upper end of the first positioning column is also connected to a first positioning plate, and the first positioning plate abuts against the upper surface of the sample cable to be tested.

[0007] Furthermore, the second positioning column is connected to the positioning groove in an adjustable height, and the upper end of the second positioning column is also connected to a second positioning plate, and the second positioning plate abuts against the upper surface of the sample cable to be tested.

[0008] Furthermore, the pressure-applying component is a hollow hydraulic cylinder, and the steel wire rope passes through an inner hole of the hollow hydraulic cylinder.

[0009] Furthermore, the pressure measuring component is a hollow pressure sensor, and the steel wire rope passes through an inner hole of the hollow pressure sensor.

[0010] Furthermore, the first rope end fixing structure and the second rope end fixing structure both include: A first connector, wherein the first connector is provided with a first through hole, and the first through hole is a tapered hole; A second connector, wherein the second connector is provided with a second through hole, the steel wire rope passes through the second through hole, the outer side wall of the second connector is a tapered side wall matching the tapered hole, the second connector is arranged in the first through hole, and the second connector can be deformed under the action of the extrusion force; The small end of the first through hole of the first rope end fixing structure faces the first pressure-bearing outer baffle plate, and the small end of the first through hole of the second rope end fixing structure faces the second pressure-bearing outer baffle plate.

[0011] Furthermore, the first connector and the second connector are both metal connectors.

[0012] Furthermore, the inner surface of the tapered hole of the first connector and the tapered side wall of the second connector are both rough surfaces.

[0013] The present invention also provides an axial compression test method for a bent submarine cable, comprising the following steps: S1. Provide a sample cable to be tested and the axial compression test device; S2. Pass the steel wire rope from one end of the sample cable to be tested into the sample cable to be tested and pass it out from the other end of the sample cable to be tested; S3, adjusting the first positioning component and the second positioning component according to the diameter of the tested sample cable and the required curvature, so that the tested sample cable forms the required curvature; S4, sequentially connecting the first pressure-bearing inner baffle, the pressure-applying component, the first pressure-bearing outer baffle and the first rope end fixing structure to the first rope end of the steel wire rope; S5. Connect the second pressure-bearing inner baffle, the pressure measuring component, the second pressure-bearing outer baffle and the second rope end fixing structure in sequence at the second rope end of the steel wire rope; S6. Start the pressure-applying component and increase the pressure at a constant speed. When the pressure-measuring component outputs the set pressure, maintain the set time and observe the changes of the measured cable. If the measured cable is not deformed, it means that the measured cable can withstand the set pressure.

[0014] The above technical solution of the present invention has the following advantages over the prior art: the axial compression test device and method of the curved submarine cable described in the present invention positions the sample cable to be tested to a posture with a set curvature by setting a test bench, a first positioning component and a second positioning component, and applies pressure and measures pressure on the sample cable to be tested through the first pressure-bearing component and the second pressure-bearing component, so that an axial compression test can be performed on a submarine cable with curvature (bending radius), which has guiding significance for the laying of submarine cables. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to make the contents of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments of the present invention in conjunction with the accompanying drawings.

[0016] Figure 1It is a schematic diagram of the working of an axial test device for a bent submarine cable in the present invention at one angle; Figure 2 for Figure 1 A partial enlarged view of the middle A; Figure 3 It is a schematic diagram of the working of an axial test device for a bent submarine cable in the present invention at one angle; Figure 4 for Figure 3 A partial enlarged view of point B in the middle; Figure 5 It is a schematic diagram of the first rope end fixing structure in the present invention.

[0017] Explanation of the reference numerals in the drawings in the specification: 1. test bench; 11. positioning groove; 2. sample cable to be tested; 31. first positioning column; 32. first positioning plate; 41. second positioning column; 42. second positioning plate; 51. first pressure-bearing inner baffle plate; 52. pressure-applying component; 53. first pressure-bearing outer baffle plate; 54. oil pipe; 55. oil pump; 61. second pressure-bearing inner baffle plate; 62. pressure-measuring component; 63. second pressure-bearing outer baffle plate; 71. steel wire rope; 72. first rope end fixing structure; 721. first connector; 722. first through hole; 723. second connector; 724. second through hole; 73. second rope end fixing structure. DETAILED DESCRIPTION

[0018] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0019] See also Figures 1 to 5 As shown, an embodiment of the axial compression test device for a bent submarine cable provided by the present invention.

[0020] The axial compression test device of the above-mentioned curved submarine cable comprises: A test bench 1, the test bench 1 is used to be supported below the sample cable 2 to be tested; A first positioning assembly, the first positioning assembly comprising a plurality of first positioning posts 31 abutting against the curved side of the sample cable 2; A second positioning assembly, the second positioning assembly comprising a plurality of second positioning posts 41 abutting against a side of the tested sample cable 2 away from the first positioning assembly; A first pressure-bearing component, the first pressure-bearing component comprises a first pressure-bearing inner baffle plate 51, a pressure-applying component 52 and a first pressure-bearing outer baffle plate 53, the first pressure-bearing inner baffle plate 51 is arranged at one end of the length direction of the tested sample cable 2, the pressure-applying component 52 is arranged at a side of the first pressure-bearing inner baffle plate 51 away from the tested sample cable 2, the pressure-applying component 52 is used to apply thrust to the first pressure-bearing inner baffle plate 51, and the first pressure-bearing outer baffle plate 53 is arranged at a side of the pressure-applying component 52 away from the first pressure-bearing inner baffle plate 51; A second pressure-bearing component, the second pressure-bearing component comprises a second pressure-bearing inner baffle plate 61, a pressure-measuring component 62 and a second pressure-bearing outer baffle plate 63, the second pressure-bearing inner baffle plate 61 is arranged at the other end of the length direction of the measured sample cable 2, the pressure-measuring component 62 is arranged at a side of the second pressure-bearing inner baffle plate 61 away from the measured sample cable 2, the pressure-measuring component 62 is used to detect the pressure received by the second pressure-bearing inner baffle plate 61 and output the pressure, and the second pressure-bearing outer baffle plate 63 is arranged at a side of the pressure-measuring component 62 away from the second pressure-bearing inner baffle plate 61; Multiple pre-tensioning components are arranged around the longitudinal axis of the test sample cable 2, and the pre-tensioning components include a steel wire rope 71, a first rope end fixing structure 72 and a second rope end fixing structure 73. The steel wire rope 71 passes through the first pressure-bearing outer baffle plate 53, the first pressure-bearing inner baffle plate 51, the test sample cable 2, the second pressure-bearing inner baffle plate 61 and the second pressure-bearing outer baffle plate 63. Each of the steel wire ropes 71 has a first rope end and a second rope end in the length direction. The first rope end is located on the side of the first pressure-bearing outer baffle plate 53 away from the pressure-applying component 52, and the second rope end is located on the side of the second pressure-bearing outer baffle plate 63 away from the pressure-measuring component 62. The first rope end fixing structure 72 is fixedly connected to the first rope end of the steel wire rope 71, and the second rope end fixing structure 73 is fixedly connected to the second rope end of the steel wire rope 71.

[0021] The test bench 1 has a flat table top, the tested cable is arranged on the flat table top, the multiple first positioning posts 31 are arranged at a certain distance along the length direction of the tested cable 2, the multiple second positioning posts 41 are arranged at a certain distance along the length direction of the tested cable 2, the side walls of the first positioning posts 31 and the second positioning posts 41 are smooth side walls, preferably, the first positioning posts 31 and the second positioning posts 41 are both cylinders. The first pressure-bearing outer baffle plate 53, the first pressure-bearing inner baffle plate 51, the second pressure-bearing inner baffle plate 61 and the second pressure-bearing outer baffle plate 63 are all provided with multiple threading holes respectively matching the multiple steel wire ropes 71, and the multiple steel wire ropes 71 respectively pass through the multiple threading holes. The surface area of ​​the first pressure-bearing inner baffle plate 51 is larger than the end surface area of ​​the pressure-applying component 52 and the tested sample cable 2, the surface area of ​​the first pressure-bearing outer baffle plate 53 is larger than the surface area of ​​the first pressure-bearing inner baffle plate 51, the surface area of ​​the second pressure-bearing inner baffle plate 61 is larger than the end surface area of ​​the pressure-measuring component 62 and the tested sample cable 2, and the surface area of ​​the second pressure-bearing outer baffle plate 63 is larger than the surface area of ​​the second pressure-bearing inner baffle plate 61. Brackets for supporting the first pressure-bearing outer baffle plate 53 and the second pressure-bearing outer baffle plate 63 are provided below the first pressure-bearing outer baffle plate 53 and the second pressure-bearing outer baffle plate 63.

[0022] By setting up a test bench, a first positioning component and a second positioning component, the sample cable to be tested is positioned at a posture with a set curvature. By using the first pressure-bearing component and the second pressure-bearing component, pressure is applied and measured on the sample cable to be tested. An axial compression test can be performed on a submarine cable with curvature (bending radius), which has guiding significance for the laying of submarine cables.

[0023] In this embodiment, a plurality of positioning grooves 11 are arranged in sequence along a first direction and spaced apart from each other on the surface of the test bench 1. Each of the positioning grooves 11 extends along a second direction. Each of the positioning grooves 11 has a first groove end and a second groove end in the second direction. The second direction is perpendicular to the first direction. The plurality of first positioning posts 31 are respectively connected to the plurality of positioning grooves 11 in an adjustable manner along the second direction; The plurality of second positioning posts 41 are respectively connected to the plurality of positioning grooves 11 in an adjustable manner along the second direction; In the same positioning groove 11 , the first positioning column 31 is close to the first groove end, and the second positioning column 41 is close to the second groove end.

[0024] The first positioning columns 31 of the first positioning assembly are sequentially arranged along the first arc, and the second positioning columns 41 of the second positioning assembly are sequentially arranged along the second arc, and an arc-shaped positioning channel for positioning the tested sample cable 2 is formed between the first arc and the second arc. A positioning groove 11 is provided on the test bench 1, and the first positioning column 31 and the second positioning column 41 are connected in the positioning groove 11 in an adjustable manner, that is, the curvature of the first arc and the second arc is adjustable, and the curvature of the arc-shaped positioning channel is adjustable, so that the tested sample cables 2 with various curvatures can be positioned as needed.

[0025] In this embodiment, the first positioning column 31 is height-adjustably connected to the positioning groove 11 , and the upper end of the first positioning column 31 is further connected to a first positioning plate 32 , which abuts against the upper surface of the sample cable 2 .

[0026] After the sample cable 2 under test is subjected to axial pressure, the table top of the test bench 1, the first positioning column 31, the second positioning column 41 and the first positioning plate 32 enclose the above-mentioned arc-shaped positioning channel, which can limit the sample cable 2 under test in various radial directions to prevent the sample cable 2 under test from deforming in various radial directions, thereby ensuring the accuracy of the test.

[0027] In this embodiment, the second positioning column 41 is height-adjustably connected to the positioning groove 11 , and the upper end of the second positioning column 41 is further connected to a second positioning plate 42 , which abuts against the upper surface of the sample cable 2 .

[0028] After the sample cable 2 under test is subjected to axial pressure, the table top of the test bench 1, the first positioning column 31, the second positioning column 41 and the second positioning plate 42 enclose the above-mentioned arc-shaped positioning channel, which can limit the sample cable 2 under test in various radial directions to prevent the sample cable 2 under test from deforming in various radial directions, thereby ensuring the accuracy of the test.

[0029] In this embodiment, the pressure-applying component 52 is a hollow hydraulic cylinder, and the steel wire rope 71 passes through an inner hole of the hollow hydraulic cylinder.

[0030] The hollow hydraulic cylinder is a special hydraulic cylinder with a hollow structure inside. The hollow structure allows cables, oil pipes or other equipment to pass through the inside, which is convenient for installation and use. The pressure component 52 is a hollow hydraulic cylinder, and the wire rope passes through the inner hole of the hollow hydraulic cylinder, so that they can be better positioned with each other. Specifically, the hollow hydraulic cylinder is connected to the oil pump 55 through the oil pipe 54.

[0031] In this embodiment, the pressure measuring component 62 is a hollow pressure sensor, and the steel wire rope 71 passes through the inner hole of the hollow pressure sensor.

[0032] The hollow pressure sensor is a special pressure sensor, the main feature of which is its hollow structure. It is usually used in specific measurement and application scenarios. This type of sensor is usually made of stainless steel and uses a strain gauge principle. It has the characteristics of low height, small deformation, and high dynamic response frequency. It is suitable for various pressure testing and pressure control occasions. The working principle of the hollow pressure sensor is based on the mechanical deformation of the pressure sensitive element. When pressure is applied to the pressure-bearing element, it will produce mechanical deformation, which is converted into an electrical signal by a converter, and then amplified by an amplifier, and finally the measured pressure value is displayed or recorded on the output device. The pressure measuring component 62 is a hollow pressure sensor, and the wire rope 71 passes through the inner hole of the hollow pressure sensor, so that they can be better positioned with each other.

[0033] In this embodiment, the first rope end fixing structure 72 includes: A first connector 721, wherein the first connector 721 is provided with a first through hole 722, and the first through hole 722 is a tapered hole; A second connector 723, wherein the second connector 723 is provided with a second through hole 724, through which the steel wire rope 71 passes, and the outer side wall of the second connector 723 is a tapered side wall matching the tapered hole, and the second connector 723 is arranged in the first through hole 722, and the second connector 723 can be squeezed and deformed; The small end of the first through hole 722 of the first rope end fixing structure 72 faces the first pressure-bearing outer baffle plate 53 , and the small end of the first through hole 722 of the second rope end fixing structure 73 faces the second pressure-bearing outer baffle plate 63 .

[0034] The small end of the second connector 723 is inserted into the tapered hole. As the second connector 723 is continuously inserted into the tapered hole, the pressure between the first connector 721 and the second connector 723 becomes greater and greater, and the extrusion force on the second connector 723 becomes greater and greater. As the tension on the wire rope 71 increases, the first connector and the second connector are self-locked together, and the second connector is deformed under the extrusion force of the first connector, thereby clamping the wire rope 71 more tightly. The second rope end fixing structure 73 has the same structure as the first rope end fixing structure 72, and will not be described in detail here.

[0035] In this embodiment, the first connection head 721 and the second connection head 723 are both metal connection heads.

[0036] The plasticity of metal is a property that allows it to undergo certain plastic deformation without breaking when subjected to external pressure. Its properties stem from its interaction with its metal elements. Due to its dense and ordered crystal structure, there is very little friction between the atoms inside it, so it is easy to move and rearrange when subjected to external pressure. Its ductility allows it to change its shape through stretching, bending, compression and other methods. The first connector 721 and the second connector 723 are both metal connectors, which can be deformed under the action of external forces. As the tension of the wire rope 71 increases, the two metal connectors and the wire rope 71 can be connected more tightly. Specifically, the first connector 721 and the second connector 723 are both carbon steel connectors.

[0037] Furthermore, the inner surface of the tapered hole of the first connector 721 and the outer tapered wall of the second connector 723 are both rough surfaces.

[0038] ‌ Rough surface refers to the unevenness of the machined surface with small spacing and tiny peaks and valleys. The inner surface of the tapered hole of the first connector 721 and the outer side surface of the second connector 723 are both rough surfaces, which increases the contact friction between the two. Specifically, the inner surface of the tapered hole of the first connector 721 and the outer tapered side wall of the second connector 723 are both provided with anti-slip convex patterns.

[0039] The following is an axial compression test method for a bent submarine cable, including the following steps: S1. Provide a sample cable 2 to be tested and the above-mentioned axial compression test device; S2, passing the steel wire rope 71 from one end of the tested sample cable 2 into the tested sample cable 2 and passing it out from the other end of the tested sample cable 2; S3, adjusting the first positioning component and the second positioning component according to the diameter of the tested sample cable 2 and the required curvature, so that the tested sample cable 2 forms the required curvature; S4, connecting the first pressure-bearing inner baffle plate 51, the pressure-applying component 52, the first pressure-bearing outer baffle plate 53 and the first rope end fixing structure 72 in sequence at the first rope end of the steel wire rope 71; S5, connecting the second pressure-bearing inner baffle 61, the pressure measuring component 62, the second pressure-bearing outer baffle 63 and the second rope end fixing structure 73 in sequence at the second rope end of the steel wire rope 71; S6. Start the pressure-applying component 52 and increase the pressure at a uniform speed. When the pressure-measuring component 62 outputs the set pressure, maintain the set time and observe the changes of the tested sample cable 2. If the tested sample cable 2 is not deformed, it means that the tested sample cable 2 can withstand the set pressure.

[0040] For example, if the length of the sample cable is 200cm, keep it for 5 minutes when the pressure measuring component displays 5kN, 10kN, and 15kN, and observe the changes in the sample. If the sample does not deform, it means that the sample can withstand the corresponding pressure.

[0041] Obviously, the above embodiments are merely examples for clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from these are still within the protection scope of the invention.

Claims

1. An axial compression test device for a bent submarine cable, characterized in that: include: A test bench, the test bench is used to be supported below the sample cable to be tested; A first positioning assembly, the first positioning assembly comprising a plurality of first positioning posts abutting against a curved side of the cable under test; A second positioning assembly, the second positioning assembly comprising a plurality of second positioning posts abutting against a side of the tested sample cable facing away from the first positioning assembly; A first pressure-bearing component, the first pressure-bearing component comprises a first pressure-bearing inner baffle plate, a pressure-applying component and a first pressure-bearing outer baffle plate, the first pressure-bearing inner baffle plate is arranged at one end of the length direction of the tested sample cable, the pressure-applying component is arranged at a side of the first pressure-bearing inner baffle plate away from the tested sample cable, the pressure-applying component is used to apply thrust to the first pressure-bearing inner baffle plate, and the first pressure-bearing outer baffle plate is arranged at a side of the pressure-applying component away from the first pressure-bearing inner baffle plate; A second pressure-bearing component, the second pressure-bearing component comprises a second pressure-bearing inner baffle plate, a pressure-measuring component and a second pressure-bearing outer baffle plate, the second pressure-bearing inner baffle plate is arranged at the other end of the length direction of the measured sample cable, the pressure-measuring component is arranged at a side of the second pressure-bearing inner baffle plate away from the measured sample cable, the pressure-measuring component is used to detect the pressure received by the second pressure-bearing inner baffle plate and output the pressure, and the second pressure-bearing outer baffle plate is arranged at a side of the pressure-measuring component away from the second pressure-bearing inner baffle plate; A plurality of pre-tensioning components are arranged around the longitudinal axis of the test cable, the pre-tensioning components include a steel wire rope, a first rope end fixing structure and a second rope end fixing structure, the steel wire rope passes through the first pressure-bearing outer baffle plate, the first pressure-bearing inner baffle plate, the test cable, the second pressure-bearing inner baffle plate and the second pressure-bearing outer baffle plate, the first rope end fixing structure is connected or abuts against a side of the first pressure-bearing outer baffle plate away from the pressure-applying component and is fixedly connected to one end of the steel wire rope, the second rope end fixing structure is connected or abuts against a side of the second pressure-bearing outer baffle plate away from the pressure-measuring component and is fixedly connected to the other end of the steel wire rope.

2. The axial compression test device according to claim 1, characterized in that: The test bench is provided with a plurality of positioning grooves arranged in sequence and spaced apart along a first direction, each positioning groove extends along a second direction, each positioning groove has a first groove end and a second groove end in the second direction, and the second direction is perpendicular to the first direction; The plurality of first positioning posts are respectively connected to the plurality of positioning grooves in an adjustable manner along the second direction; The plurality of second positioning posts are respectively connected to the plurality of positioning grooves in an adjustable manner along the second direction; In the same positioning groove, the first positioning column is close to the first groove end, and the second positioning column is close to the second groove end.

3. The axial compression test device according to claim 2, characterized in that: The first positioning column is connected to the positioning groove in an adjustable height, and the upper end of the first positioning column is also connected to a first positioning plate, and the first positioning plate abuts against the upper surface of the sample cable to be tested.

4. The axial compression test device according to claim 2, characterized in that: The second positioning column is connected to the positioning groove in an adjustable height, and the upper end of the second positioning column is also connected to a second positioning plate, and the second positioning plate abuts against the upper surface of the sample cable to be tested.

5. The axial compression test device according to claim 1, characterized in that: The pressure-applying component is a hollow hydraulic cylinder, and the steel wire rope passes through the inner hole of the hollow hydraulic cylinder.

6. The axial compression test device according to claim 1, characterized in that: The pressure measuring component is a hollow pressure sensor, and the steel wire rope passes through the inner hole of the hollow pressure sensor.

7. The axial compression test device according to claim 1, characterized in that: The first rope end fixing structure and the second rope end fixing structure both include: A first connector, wherein the first connector is provided with a first through hole, and the first through hole is a tapered hole; A second connector, wherein the second connector is provided with a second through hole, the steel wire rope passes through the second through hole, the outer side wall of the second connector is a tapered side wall matching the tapered hole, the second connector is arranged in the first through hole, and the second connector can be deformed under the action of the extrusion force; The small end of the first through hole of the first rope end fixing structure faces the first pressure-bearing outer baffle plate, and the small end of the first through hole of the second rope end fixing structure faces the second pressure-bearing outer baffle plate.

8. The axial compression test device according to claim 7, characterized in that: The first connector and the second connector are both metal connectors.

9. The axial compression test device according to claim 7, characterized in that: The inner surface of the tapered hole of the first connector and the tapered side wall of the second connector are both rough surfaces.

10. A method for axial compression testing of a bent submarine cable, characterized in that: The steps include: S1. Provide a sample cable to be tested and an axial compression test device as described in any one of claims 1 to 9; S2. Pass the steel wire rope from one end of the sample cable to be tested into the sample cable to be tested and pass it out from the other end of the sample cable to be tested; S3, adjusting the first positioning component and the second positioning component according to the diameter of the tested sample cable and the required curvature, so that the tested sample cable forms the required curvature; S4, sequentially connecting the first pressure-bearing inner baffle, the pressure-applying component, the first pressure-bearing outer baffle and the first rope end fixing structure to the first rope end of the steel wire rope; S5. Connect the second pressure-bearing inner baffle, the pressure measuring component, the second pressure-bearing outer baffle and the second rope end fixing structure in sequence at the second rope end of the steel wire rope; S6. Start the pressure-applying component and increase the pressure at a constant speed. When the pressure-measuring component outputs the set pressure, maintain the set time and observe the changes of the measured cable. If the measured cable is not deformed, it means that the measured cable can withstand the set pressure.

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