Sea condition indoor analogue simulation fixing device and method for seabed slender strip-shaped component

Abstract

The invention discloses a sea condition indoor analogue simulation fixing device and method for a seabed long and thin strip-shaped component. The sea condition indoor analogue simulation fixing device comprises a component fixing assembly and a position adjusting support, a mounting table is arranged on the position adjusting support, and the component fixing assembly is mounted on the mounting table; the subsea elongated member can be clamped by the member securing assembly. The component fixing assembly comprises a fixing plate, a force measuring spring and a component hoop assembly. The component hoop assembly comprises a jacking component and an arc-shaped friction plate; the number of the arc-shaped friction plates is at least two, the arc-shaped friction plates are evenly distributed and can define a component hoop assembly, and meanwhile the middle position of each arc-shaped friction plate is provided with a jacking component. Therefore, the degree of freedom and the force of the two ends of the seafloor slender strip-shaped component can be freely adjusted, and the problem that the two ends of the seafloor slender strip-shaped component are fixed, so that actual forced motion vibration is difficult to simulate actually is solved.

Description

Technical Field

[0001] The invention relates to a sea condition indoor simulation fixing device for a seabed slender strip-shaped component and a method thereof. Background Art

[0002] Slender rigid or flexible components on the seabed are common artificial marine structures in the sea area. Typical examples include flexible submarine optical cables and rigid submarine oil and gas pipelines. Due to the complex topography of the seabed where they are laid and the wide range of laying, they often face extremely complex and changeable sea conditions, which brings great inconvenience to their own safety and maintenance. A typical example is the optical cable across the Pacific Ocean between China and the United States, which even needs to cross the entire Pacific Ocean; another example is the Nord Stream natural gas pipeline from Russia to Germany, which crosses the Baltic Sea and is more than 1,000 km long.

[0003] In view of the complex and changeable scenarios faced by such slender flexible or rigid components, and the huge investment and complex construction process involved, a large number of corresponding indoor tests are often required in the early stage to demonstrate their feasibility and reliability. Among them, the force vibration problem of the slender strip components on the seabed is typically one of the important reasons for the damage of the components. To this end, it is necessary to simulate the seabed sea conditions and the slender strip components on the seabed at full scale indoors to observe and inspect the oscillation damage process of the slender strip components on the seabed.

[0004] However, in indoor simulation tests, whether the fixing method at both ends of the slender strip-shaped components on the seabed can fully reflect the force and vibration movement of the slender strip-shaped components on the seabed under actual sea conditions is an important prerequisite for ensuring the accuracy of the test results. Summary of the invention

[0005] The purpose of the present invention is to provide a device and method for indoor simulation of sea conditions of a slender strip-like submarine component, which can overcome the problem that the fixing method at both ends of the slender strip-like submarine component is difficult to truly simulate the actual forced motion vibration by freely adjusting the degree of freedom and force at both ends of the slender strip-like submarine component.

[0006] In order to achieve the above technical objectives, the present invention will adopt the following technical solutions:

[0007] A sea condition indoor simulation fixture for a seabed slender strip-shaped component, comprising a component fixing assembly and a position adjustment support, wherein:

[0008] The position adjustment support is provided with a mounting platform; the component fixing assembly is installed on the mounting platform; the seabed elongated strip-shaped component can be clamped by the component fixing assembly;

[0009] The component fixing assembly comprises a fixing plate, a force measuring spring and a component clamp assembly;

[0010] A circular cavity is provided at the middle of the fixing plate;

[0011] The component clamp assembly is arranged in the circular cavity, and the component clamp assembly is connected to the cavity wall of the circular cavity through a plurality of uniformly distributed force measuring springs;

[0012] The component clamp assembly includes a tightening component and an arcuate friction plate; there are at least two arcuate friction plates, each of which is evenly distributed and can be enclosed to form a component clamp assembly, and there is a gap between two adjacent arcuate friction plates that meets engineering needs. At the same time, a tightening component that can lock the arcuate friction plate and the seabed slender strip component placed in the component clamp assembly is installed in the middle position of each arcuate friction plate.

[0013] Preferably, the position adjustment support is a cross sliding device.

[0014] Preferably, the cross sliding device comprises a transverse slide plate and a vertical slide plate; wherein:

[0015] One side of the mounting platform is mounted on the horizontal slide plate in a detachable connection manner, and the other side is also connected to the vertical slide plate in a detachable connection manner;

[0016] When the connection between the mounting platform and the horizontal slide plate is released, the horizontal slide plate can freely move laterally relative to the vertical slide plate through the mounting platform until it reaches the target position, and then the connection between the mounting platform and the vertical slide plate is locked;

[0017] When the connection between the mounting platform and the vertical slide plate is released, the vertical slide plate can freely move vertically relative to the horizontal slide plate through the mounting platform until it reaches the target position, and then the connection between the mounting platform and the horizontal slide plate is locked.

[0018] Preferably, the mounting platform is a raised wheel rail; the raised wheel rail is a hollow structure, and the outer wing surface of the raised wheel rail is nested and clamped with the vertical slide plate, and the other side of the raised wheel rail opposite to the outer wing surface is connected to the horizontal slide plate;

[0019] The component fixing assembly is assembled in the hollow structure of the raised wheel rail, and the fixing plate is provided with connecting bolts to be connected with the raised wheel rail into one body.

[0020] Preferably, the transverse slide plate and the vertical slide plate are evenly distributed with a number of screw holes along their length extension direction; there are four through bolt holes between the raised wheel rail and the transverse slide plate and the vertical slide plate, which are locked one by one by fixing bolts; the outer wing surface of the raised wheel rail is vertically positioned by two fixing bolts on the same side.

[0021] Preferably, the transverse slide plate and the vertical slide plate are both plate-shaped slotted structures made of steel material, meeting the following requirements: thickness between 1 and 2 cm, width ≥ 25 cm, and slide groove width ≥ 18 cm; bolt holes are evenly spaced on both sides of the slide groove of the transverse slide plate and the vertical slide plate, and the diameter of the bolt holes is ≈ 0.7 cm and the hole spacing is ≈ 2 cm.

[0022] Preferably, the tightening member is a special-shaped bolt.

[0023] Preferably, there are two arc-shaped friction plates;

[0024] Each arc-shaped friction plate is equipped with an even number of force measuring springs; for each arc-shaped friction plate, the force measuring springs are symmetrically distributed relative to the position of the tightening component.

[0025] Another technical purpose of the present invention is to provide a method for indoor simulation of sea conditions of a seabed elongated strip-shaped component, which is implemented based on the above-mentioned indoor simulation fixture for sea conditions of a seabed elongated strip-shaped component, and comprises:

[0026] Step 1: Assembly:

[0027] One end of the seabed slender strip member is clamped and fixed by a sea condition indoor simulation fixture, and the other end is connected to a tension device;

[0028] Step 2: Calculate the tension applied by the tension device:

[0029] F = Vρg;

[0030] Where: V is the volume of the weight in the pulling device; ρ is the density of the weight in the pulling device; g is the acceleration of gravity of the earth;

[0031] Step 3: Calculate the force and moment borne by the fixed end of the slender strip member on the seabed:

[0032]

[0033] Where: F is the sum of the forces borne by the fixed end of the slender strip-shaped component on the seabed; n is the total number of force-measuring springs in the indoor simulation fixture for sea conditions; i represents the i-th force-measuring spring; is the force vector value of the i-th force-measuring spring; M is the sum of the moments borne by the fixed end of the seabed slender strip component; L i is the torque of the i-th force measuring spring.

[0034] Based on the above technical objectives, the present invention has the following advantages over the prior art:

[0035] 1. The present invention fully considers the stress and vibration movement mode of the submarine slender strip-shaped components under actual sea conditions, and develops a component fixing assembly for fixing the submarine slender strip-shaped components. The clamping part of the component fixing assembly is set as a split component and equipped with a force measuring spring, so it has the advantages of freedom and adjustable force, and can more realistically simulate the forced movement and vibration of the submarine slender strip-shaped components, thereby providing a guarantee for the accuracy of the test results.

[0036] 2. The indoor simulation fixture for sea conditions described in the present invention also provides a position adjustment support to load the component fixing assembly through the position adjustment support, thereby facilitating the adjustment of the test position and orientation. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a schematic structural diagram of the indoor simulation and fixing device for sea conditions of the seabed elongated strip-shaped member according to the present invention;

[0038] Figure 2 yes Figure 1 A schematic diagram of the structure of the middle component fixing assembly;

[0039] Figure 3 yes Figure 1 A schematic diagram of the structure of the middle position adjustment support;

[0040] Figure 4 yes Figure 1 Structural diagram of the middle mounting platform;

[0041] Figure 5 It is a structural schematic diagram of using the indoor simulation fixture for sea conditions of the present invention to simulate the stress of a thin and long strip-shaped component on the seabed;

[0042] In the figure: 1. Position adjustment support; 11. Vertical slide plate; 12. Horizontal slide plate; 13. Adjustment hole; 14. Fixing bolt; 2. Component fixing assembly; 21. Fixing plate; 22. Arc friction plate; 23. Force measuring spring; 24. Special-shaped bolt; 25. Connecting bolt; 26. Mounting table; 3. Subsea slender strip component; 4. Tension device; 41. Tension device chassis; 42. Tension device bracket; 43. Weight; 44. Rotatable pulley; 45. Pull rope; 46. Ring fastener. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means any limitation to the present invention and its application or use. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Unless otherwise specified, the relative arrangement, expressions and numerical values ​​of the components and steps described in these embodiments do not limit the scope of the present invention. The techniques, methods and equipment known to ordinary technicians in the relevant fields may not be discussed in detail, but in appropriate cases, the techniques, methods and equipment should be regarded as part of the specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of the exemplary embodiments may have different values.

[0044] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations).

[0045] like Figure 1-5 As shown, the indoor simulation and fixing device for sea condition of the slender strip-shaped seabed component described in the present invention includes a component fixing assembly and a position adjustment support, and a mounting platform is provided on the position adjustment support; the component fixing assembly is installed on the mounting platform; the slender strip-shaped seabed component can be clamped by the component fixing assembly.

[0046] Specifically, the component fixing assembly of the present invention is as follows: Figure 2As shown, it includes a fixing plate, a force measuring spring and a component clamp assembly; a circular cavity is provided at the middle position of the fixing plate, so that the fixing plate is a frame-type fixing plate; the component clamp assembly is arranged in the circular cavity, and the component clamp assembly and the cavity wall of the circular cavity are connected by a number of uniformly distributed force measuring springs, the force measuring spring can display the tension or pressure value during the test, and the connection between the force measuring spring and the component clamp assembly and the cavity wall of the circular cavity is hinged; the component clamp assembly includes a tightening member and an arc-shaped friction plate; there are at least two arc-shaped friction plates, and in the attached figure, there are two arc-shaped friction plates, which are symmetrically distributed up and down. Of course, the number of arc-shaped friction plates can also be selected from other values. Each arc-shaped friction plate is evenly distributed and can be enclosed to form a component clamp assembly, and there is a gap between two adjacent arc-shaped friction plates that meets the engineering needs. At the same time, each arc-shaped friction plate is equipped with a tightening member at the middle position that can lock the arc-shaped friction plate with the seabed slender strip member placed in the component clamp assembly, and the tightening member adopts a special-shaped bolt. It can be seen that in the present invention, the component clamp assembly is configured as a split component, and the component clamp assembly is connected to the circular cavity through evenly distributed force measuring springs, so that on the one hand, it can ensure that the component clamp assembly is adapted to the seabed slender strip components of different radius sizes, and on the other hand, through the configured force measuring springs, it can ensure that the seabed slender strip components have the advantages of freedom and adjustable force.

[0047] According to the strength of the slender strip-shaped submarine component used for the test and the possible stress conditions during the test, the force measuring spring can be replaced to meet the test requirements. In addition, in order to meet the requirements of uneven stress in different directions during the test, the force measuring springs at different positions can be replaced and debugged with force measuring components of different types and different force measuring ranges. The inner edge of the arc-shaped friction plate is in direct contact with the slender strip-shaped submarine component used for the test, and the two are fixed by special-shaped bolts. In order to ensure the relative micro-displacement requirements during the test, the inner edge diameter of the arc-shaped friction plate must meet the requirements of 1.00 to 1.05 times the diameter or size of the slender strip-shaped submarine component.

[0048] In addition, in the present invention, each arc-shaped friction plate is equipped with an even number of force measuring springs; for each arc-shaped friction plate, each force measuring spring is symmetrically distributed relative to the position of the pressing member. In the accompanying drawings, there are four force measuring springs in total, and each arc-shaped friction plate is equipped with two, which are symmetrically distributed on both sides of each pressing member. Of course, the number of force measuring springs equipped for each arc-shaped friction plate can be 4 or 6, and this specific number cannot limit this technology of the present invention.

[0049] The position adjustment support described in the present invention is a cross sliding device, such as Figure 3As shown, the cross sliding device includes a horizontal slide plate and a vertical slide plate; one side of the mounting platform is mounted on the horizontal slide plate by a detachable connection, and the other side is also connected to the vertical slide plate by a detachable connection; when the connection between the mounting platform and the horizontal slide plate is released, the horizontal slide plate can freely move horizontally relative to the vertical slide plate through the mounting platform until it reaches the target position, and then the connection between the mounting platform and the vertical slide plate is locked; when the connection between the mounting platform and the vertical slide plate is released, the vertical slide plate can freely move vertically relative to the horizontal slide plate through the mounting platform until it reaches the target position, and then the connection between the mounting platform and the horizontal slide plate is locked. Wherein:

[0050] The mounting platform is a raised wheel track, such as Figure 4 As shown, the raised wheel track is a hollow structure, and the outer wing surface of the raised wheel track is nested and connected with the vertical slide plate to avoid relative displacement between the raised wheel track and the vertical slide plate. The other side of the raised wheel track opposite to the outer wing surface is connected to the horizontal slide plate; the component fixing assembly is assembled in the hollow structure of the raised wheel track, and connecting bolts are provided on the fixing plate to connect with the raised wheel track as a whole. The size of the component fixing assembly can be adjusted and replaced according to the size of the slender strip-shaped components on the seabed, but its size must meet 0.80 to 0.95 times the hollow structure in the raised wheel track to meet the locking requirements of sufficient strength.

[0051] The horizontal chute plate and the vertical chute plate are evenly distributed with several screw holes along their length extension direction; there are four through bolt holes between the raised wheel rail and the horizontal chute plate and the vertical chute plate, which are locked one by one by fixing bolts; the outer wing surface of the raised wheel rail is vertically positioned by two fixing bolts on the same side. The horizontal chute plate and the vertical chute plate are both plate-shaped slotted structures made of steel materials, meeting the following requirements: thickness between 1 and 2 cm, width ≥ 25 cm, and chute width ≥ 18 cm; bolt holes are evenly spaced on both sides of the chute of the horizontal chute plate and the vertical chute plate, with a bolt hole diameter of ≈ 0.7 cm and a hole spacing of ≈ 2 cm.

[0052] Based on the above-mentioned indoor simulation and fixing device for sea conditions of seabed slender strip-shaped components, the present invention also provides an indoor simulation and fixing method for sea conditions of seabed slender strip-shaped components, comprising:

[0053] Step 1: Assembly:

[0054] One end of the seabed slender strip member (for testing) is clamped and fixed by a sea condition indoor simulation fixture, and the other end is connected to a tension device;

[0055] like Figure 5As shown, the tension device includes an annular fixing device, a tension rope, a rotatable pulley, a tension device bracket, a weight and a tension device chassis. The annular fixing device is tightly connected to one end of the slender strip-shaped member on the seabed, and the annular fixing device is connected to the tension rope. At the same time, the tension rope is connected to the weight through a rotatable pulley. The weight can be adjusted in type, size and mass according to the need of tension. The rotatable pulley is installed at the top of the tension device bracket, and the tension device bracket is adjusted according to the mass of the weight. The number of tension device brackets can be adjusted between 3 and 8. The tension device bracket is located on the tension device base, and the two are fixed to each other, and the mass of the tension device base is required to be able to maintain a horizontal state under different weight conditions.

[0056] Attached Figure 1 In the process, both ends of the slender strip-shaped component on the seabed are clamped and fixed by a sea condition indoor simulation fixture.

[0057] Attached Figure 5 In the figure, only one end of the slender strip-shaped component on the seabed is clamped and fixed by the indoor sea condition simulation fixture, the other end is omitted, and the structure of the tension device is unfolded in detail.

[0058] Step 2: Calculate the tension applied by the tension device:

[0059] F = Vρg;

[0060] Where: V is the volume of the weight in the pulling device; ρ is the density of the weight in the pulling device; g is the acceleration of gravity of the earth;

[0061] Step 3: Calculate the force and moment borne by the fixed end of the slender strip member on the seabed:

[0062]

[0063] Where: F is the sum of the forces borne by the fixed end of the slender strip-shaped component on the seabed; n is the total number of force-measuring springs in the indoor simulation fixture for sea conditions; i represents the i-th force-measuring spring; is the force vector value of the i-th force-measuring spring; M is the sum of the moments borne by the fixed end of the seabed slender strip component; L i is the torque of the i-th force measuring spring.

Claims

1. A device for indoor simulation and fixing of sea conditions of a thin and long strip-shaped member on the seabed, characterized in that: It includes a component fixing assembly and a position adjustment support, wherein: The position adjustment support is provided with a mounting platform; the component fixing assembly is installed on the mounting platform; the seabed elongated strip-shaped component can be clamped by the component fixing assembly; The component fixing assembly comprises a fixing plate, a force measuring spring and a component clamp assembly; A circular cavity is provided at the middle of the fixing plate; The component clamp assembly is arranged in the circular cavity, and the component clamp assembly is connected to the cavity wall of the circular cavity through a plurality of uniformly distributed force measuring springs; The component clamp assembly includes a tightening component and an arcuate friction plate; there are at least two arcuate friction plates, each of which is evenly distributed and can be enclosed to form a component clamp assembly, and there is a gap between two adjacent arcuate friction plates that meets engineering needs. At the same time, a tightening component that can lock the arcuate friction plate and the seabed slender strip component placed in the component clamp assembly is installed in the middle position of each arcuate friction plate.

2. The indoor simulation and fixing device for sea conditions of the seabed elongated strip-shaped member according to claim 1 is characterized in that: The position adjustment support is a cross sliding device.

3. The indoor sea condition simulation fixture for the seabed elongated strip-shaped member according to claim 2 is characterized in that: The cross sliding device comprises a transverse sliding groove plate and a vertical sliding groove plate; wherein: One side of the mounting platform is mounted on the horizontal slide plate in a detachable connection manner, and the other side is also connected to the vertical slide plate in a detachable connection manner; When the connection between the mounting platform and the horizontal slide plate is released, the horizontal slide plate can freely move laterally relative to the vertical slide plate through the mounting platform until it reaches the target position, and then the connection between the mounting platform and the vertical slide plate is locked; When the connection between the mounting platform and the vertical slide plate is released, the vertical slide plate can freely move vertically relative to the horizontal slide plate through the mounting platform until it reaches the target position, and then the connection between the mounting platform and the horizontal slide plate is locked.

4. The indoor simulation and fixing device for sea conditions of the seabed elongated strip-shaped member according to claim 3 is characterized in that: The mounting platform is a raised wheel rail; the raised wheel rail is a hollow structure, and the outer wing surface of the raised wheel rail is nested and clamped with the vertical slide plate, while the other side of the raised wheel rail opposite to the outer wing surface is connected to the horizontal slide plate; The component fixing assembly is assembled in the hollow structure of the raised wheel rail, and the fixing plate is provided with connecting bolts to be connected with the raised wheel rail into one body.

5. The indoor sea condition simulation fixture for the seabed elongated strip-shaped member according to claim 3 is characterized in that: The horizontal slide plate and the vertical slide plate are evenly distributed with a number of screw holes along their length extension direction; there are four through bolt holes between the raised wheel rail and the horizontal slide plate and the vertical slide plate, which are locked one by one by fixing bolts; the outer wing surface of the raised wheel rail is vertically positioned by two fixing bolts on the same side.

6. The indoor simulation and fixing device for sea conditions of the seabed elongated strip-shaped member according to claim 5 is characterized in that: The horizontal slide plate and the vertical slide plate are both plate-shaped slotted structures made of steel material, meeting the following requirements: thickness between 1 and 2 cm, width ≥ 25 cm, and slide groove width ≥ 18 cm; bolt holes are evenly spaced on both sides of the slide groove of the horizontal slide plate and the vertical slide plate, with a bolt hole diameter of ≈ 0.7 cm and a hole spacing of ≈ 2 cm.

7. The indoor sea condition simulation fixture for the seabed elongated strip-shaped member according to claim 1, characterized in that: The tightening member is a special-shaped bolt.

8. The indoor sea condition simulation fixture for the seabed elongated strip-shaped member according to claim 1, characterized in that: There are two arc-shaped friction plates in total; Each arc-shaped friction plate is equipped with an even number of force measuring springs; for each arc-shaped friction plate, the force measuring springs are symmetrically distributed relative to the position of the tightening component.

9. A method for indoor simulation of sea conditions of a seabed slender strip-shaped component, which is realized based on the indoor simulation fixture of sea conditions of a seabed slender strip-shaped component according to claim 1, characterized in that: include: Step 1: Assembly: One end of the seabed slender strip member is clamped and fixed by a sea condition indoor simulation fixture, and the other end is connected to a tension device; Step 2: Calculate the tension applied by the tension device: F'=Vρg; Where: V is the volume of the weight in the pulling device; ρ is the density of the weight in the pulling device; g is the acceleration of gravity of the earth; Step 3: Calculate the force and moment borne by the fixed end of the slender strip-shaped member on the seabed: Where: F is the sum of the forces borne by the fixed end of the slender strip-shaped component on the seabed; n is the total number of force-measuring springs in the indoor simulation fixture for sea conditions; i represents the i-th force-measuring spring; is the force vector value of the i-th force-measuring spring; M is the sum of the moments borne by the fixed end of the seabed slender strip-shaped component; L i is the torque of the i-th force measuring spring.

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