A bending measurement device for submarine cable laying

Abstract

This invention relates to the field of submarine cable bending measurement technology and discloses a bending measurement device for submarine cable laying, including a head-end annular block and a submarine cable sleeve, and further including a connecting mechanism, which includes a plurality of circular connecting blocks and an end connecting block arranged sequentially behind the head-end annular block. This invention uses a fiber optic grating sensor to monitor the bending strain of the submarine cable in real time, converting the wavelength offset into curvature data. Due to the small diameter of the circular water jet nozzles, the seawater inside the hollow rubber blocks generates pressure when adjacent hollow rubber blocks come into contact, thereby increasing the buffering force when adjacent hollow rubber blocks come into contact, further reducing damage to the device caused by rapid bending. Correspondingly, the water sprayed from the circular water jet nozzles impacts the outer wall of the submarine cable sleeve, repelling algae and shellfish that enter the device from the gaps between the circular connecting blocks, thus preventing algae and shellfish from affecting the submarine cable.

Description

Technical Field

[0001] This invention relates to the field of submarine cable bending measurement equipment, specifically a bending measurement device for submarine cable laying. Background Technology

[0002] Real-time measurement of submarine cable bending requires the use of fiber Bragg grating sensors. In complex seabed environments, submarine cables often bend and deform due to ocean currents, geological movements, ship anchoring, or laying / maintenance operations. Excessive bending can cause micro-bending or macro-bending losses within the optical fiber, and in severe cases, even fiber breakage, leading to communication interruptions. Therefore, real-time monitoring of the bending state and strain distribution of submarine cables is of great significance for preventing damage and ensuring stable system operation.

[0003] When submarine cables undergo rapid or large-curvature bending, sensors are prone to permanent deformation or breakage, leading to monitoring failure and creating "monitoring blind spots." The long-term impact of marine organism attachment on submarine cables is that algae, barnacles, shellfish, and other organisms can easily grow and accumulate on the outer wall of the submarine cable and in the gaps of the connecting structures, forming a biofouling layer. This biofouling can change the local stiffness of the submarine cable, interfering with the accurate transmission of strain from the outer sheath to the internal sensors, resulting in distorted curvature measurements, reduced monitoring accuracy, and even misjudgments. Summary of the Invention

[0004] The purpose of this invention is to provide a bending measurement device for submarine cable laying to solve the problems mentioned in the background art.

[0005] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution:

[0006] This invention relates to a bending measurement device for submarine cable laying, comprising a head-end annular block and a submarine cable sleeve, and further comprising:

[0007] The fiber optic measurement unit includes a fiber optic grating sensor installed inside the submarine cable sheath. The fiber optic grating sensor is connected to the deck monitoring system via an armored optical cable, converts wavelength offset signals into curvature data and triggers an alarm. The fiber optic grating sensor detects the bending degree of the submarine cable by monitoring the fiber wavelength offset in real time.

[0008] The connecting mechanism includes a plurality of circular connecting blocks and an end connecting block arranged sequentially behind the head annular block, and the submarine cable sleeve passes through the head annular block, the plurality of circular connecting blocks and the end connecting block;

[0009] A buffer mechanism is provided, which is disposed on a plurality of circular connecting blocks and an end connecting block. The buffer mechanism includes two connecting plates, each fixedly installed on the outer wall of the plurality of circular connecting blocks and the end connecting blocks. Two limiting round rods are fixedly installed on each of the plurality of circular connecting blocks and the first annular block. The limiting round rods rotatably pass through the plurality of connecting plates. The end connecting block and the first annular block are respectively provided with annular threaded plates on the side away from the circular connecting blocks. The buffer mechanism is used to limit the lateral swing amplitude of the circular connecting blocks.

[0010] Furthermore, the connecting mechanism also includes two hollow rubber blocks that are respectively fixedly installed on the back of the first annular block, the front and back of several circular connecting blocks, and the front of the end connecting block, wherein the side closer to the first annular block is the front and the side closer to the end connecting block is the back.

[0011] Furthermore, annular cavities are respectively formed on the first annular block, several circular connecting blocks and the end connecting block, and circular water spray holes are respectively formed on the inner walls of the first annular block, several circular connecting blocks and the end connecting block. Several circular water spray holes are respectively connected to several annular cavities. The circular water spray holes spray water to drive away attached organisms and avoid the accumulation of organisms that would cause distortion in the strain transmission of the sensor.

[0012] Furthermore, the submarine cable sheath contains several cables.

[0013] Furthermore, each of the two annular threaded plates is threaded with a pentagonal head bolt.

[0014] Furthermore, several elastic limiting threaded plates are fixedly installed at the ends of the two annular threaded plates that are far apart from each other. Each of the several elastic limiting threaded plates has a threaded groove, and a limiting end is fixedly installed at the ends of the several elastic limiting threaded plates that are far apart from each other from the circular connecting block.

[0015] Furthermore, trapezoidal rubber blocks are fixedly installed on the inner side of several elastic limiting threaded plates, and both the trapezoidal rubber blocks and the submarine cable sleeve are made of rubber.

[0016] Furthermore, two limiting grooves are respectively opened on one side of the trapezoidal rubber blocks that are close to each other, and several annular limiting blocks are provided on the outer wall of the submarine cable sleeve, and the several limiting grooves are adapted to the annular limiting blocks.

[0017] The present invention has the following beneficial effects:

[0018] (1) The present invention provides a bending measurement device for submarine cable laying. During the bending process of the submarine cable, the bending strain of the submarine cable is monitored in real time by a fiber optic grating sensor, and the wavelength offset is converted into curvature data. Since the circular water jet hole and the annular cavity are connected, when the circular connecting block is placed on the seabed, seawater will enter the annular cavity from the circular water jet hole and then enter the hollow rubber block from the annular cavity. When the hollow rubber blocks are in contact due to bending, the compression of adjacent hollow rubber blocks will cause seawater to be sprayed into the sea from the circular water jet hole. Since the outlet diameter of the circular water jet hole is small, the seawater inside the hollow rubber block is relatively small. Water generates pressure when adjacent hollow rubber blocks come into contact, thereby increasing the buffering force when adjacent hollow rubber blocks come into contact, further reducing the damage to the device caused by rapid bending, and correspondingly reducing the damage to the fiber optic grating sensor caused by excessive bending, which would affect the real-time measurement function of the fiber optic grating sensor. Meanwhile, the water sprayed from the circular water jet will impact the outer wall of the submarine cable sleeve, driving away algae and shellfish that enter the device from the gaps between the circular connecting blocks, avoiding the accumulation of organisms that would cause distortion in the strain transmission of the sensor, and ensuring the bending measurement accuracy (±0.1°).

[0019] (2) The present invention provides a bending degree measuring device for submarine cable laying. In use, the first-end annular block, several circular connecting blocks, and the last-end connecting block are fitted onto the submarine cable sleeve. Then, two pentagonal head bolts are rotated to move them away from each other. The pentagonal head bolts rotate and move under the action of the threads on the annular threaded plate. Under the action of the thread grooves, the pentagonal head bolts move onto several elastic limiting threaded plates. During the movement of the pentagonal head bolts, several elastic limiting threaded plates contract and move closer to the submarine cable sleeve. The elastic limiting threaded plates then move several trapezoidal rubber blocks towards each other. When the two parts come into close contact with the cable sleeve, the trapezoidal rubber block clamps the cable sleeve as the pentagonal head bolt rotates continuously. The corresponding limiting groove on the trapezoidal rubber block will lock onto the annular limiting block on the cable sleeve, thereby fixing the first annular block, several circular connecting blocks and the last connecting block to the cable. Since the limiting groove is locked onto the annular limiting block, the device will not slip or shift when the cable drifts with the waves, thus ensuring the stability of the device. This structure can also achieve rapid installation and fixing of the cable, improving installation efficiency.

[0020] (3) The present invention provides a bending degree measuring device for submarine cable laying. After the device is installed, the submarine cable is placed on the seabed. When encountering typhoons or large waves, the waves will push the submarine cable and the device together. The device and the submarine cable will drift on the seabed. At this time, the submarine cable will swing irregularly under the action of the waves and thus bend. The corresponding fiber optic grating sensor will follow the bending of the submarine cable. The bending degree of the submarine cable is measured in real time by the fiber optic grating sensor. The bending of the submarine cable will cause several circular connecting blocks to bend. Due to the limiting action of the limiting rod and the connecting plate, the circular connecting blocks will only swing left and right. This reduces the risk of the device swinging freely. When the circular connecting block bends, it will contact the adjacent circular connecting block, thereby limiting the bending of the submarine cable and ensuring that the bending value of the submarine cable is greater than 1.5 meters. This prevents the cable from breaking due to excessive bending. Through the synergistic effect of fiber optic sensing and mechanical buffering, the bending measurement accuracy (±0.1°) is guaranteed, while preventing the submarine cable from breaking due to instantaneous impact overload. When the circular connecting blocks bend and approach each other, the adjacent hollow rubber blocks will first come into contact, thus playing a buffering role and preventing wear caused by long-term direct contact of the circular connecting blocks.

[0021] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 This is a side cross-sectional view of the present invention;

[0025] Figure 3 This is a partial cross-sectional structural schematic diagram of the present invention;

[0026] Figure 4 For the present invention Figure 3 A magnified structural diagram of A in the middle;

[0027] Figure 5 This is a partial front cross-sectional view of the present invention;

[0028] Figure 6 For the present invention Figure 5 Schematic diagram of the enlarged structure of B;

[0029] Figure 7 For the present invention Figure 3 A magnified structural diagram of C;

[0030] Figure 8 For the present invention Figure 1 A magnified structural diagram of D in the diagram.

[0031] The attached diagram lists the components represented by each number as follows:

[0032] In the diagram: 1. Head annular block; 101. End connecting block; 102. Circular connecting block; 103. Hollow rubber block; 104. Circular cavity; 105. Circular water jet hole; 106. Submarine cable sleeve; 107. Cable; 108. Fiber optic grating sensor; 2. Connecting plate; 201. Limiting rod; 202. Circular threaded plate; 203. Pentagonal head bolt; 204. Elastic limiting threaded plate; 205. Limiting end; 206. Trapezoidal rubber block; 207. Limiting groove; 208. Circular limiting block. Detailed Implementation

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0034] Please see Figures 1-8 As shown, the present invention is a bending degree measuring device for submarine cable laying, including a head-end annular block 1 and a submarine cable sleeve 106, and further comprising:

[0035] The fiber optic measurement unit includes a fiber optic grating sensor 108 installed inside the submarine cable sleeve 106. The fiber optic grating sensor 108 is connected to the deck monitoring system via an armored optical cable, converts the wavelength offset signal into curvature data and triggers an alarm. The fiber optic grating sensor 108 detects the bending degree of the submarine cable by monitoring the fiber wavelength offset in real time.

[0036] The connecting mechanism includes a plurality of circular connecting blocks 102 and an end connecting block 101 arranged sequentially behind the first annular block 1. The submarine cable sleeve 106 passes through the first annular block 1, the plurality of circular connecting blocks 102 and the end connecting block 101.

[0037] A buffer mechanism is provided on several circular connecting blocks 102 and an end connecting block 101. The buffer mechanism includes two connecting plates 2, which are fixedly installed on the outer walls of several circular connecting blocks 102 and end connecting blocks 101. Two limiting rods 201 are fixedly installed on several circular connecting blocks 102 and the first annular block 1, respectively. The limiting rods 201 rotate through several connecting plates 2. The side of the end connecting block 101 and the first annular block 1 away from the circular connecting blocks 102 is provided with annular threaded plates 202. The buffer mechanism is used to limit the lateral swing amplitude of the circular connecting blocks 102.

[0038] like Figure 1 , Figure 2 and Figure 3 As shown, the connecting mechanism also includes two hollow rubber blocks 103 that are respectively fixedly installed on the back of the first annular block 1, the front and back of several circular connecting blocks 102, and the front of the end connecting block 101, wherein the side closer to the first annular block 1 is the front and the side closer to the end connecting block 101 is the back.

[0039] When in use, the first annular block 1, several circular connecting blocks 102 and the last connecting block 101 are put onto the submarine cable sleeve 106, and then the two pentagonal head bolts 203 are rotated respectively.

[0040] like Figure 4 As shown, annular cavities 104 are respectively provided on the first annular block 1, several circular connecting blocks 102 and the last connecting block 101. Circular water spray holes 105 are respectively provided on the inner walls of the first annular block 1, several circular connecting blocks 102 and the last connecting block 101. Several circular water spray holes 105 are respectively connected to several annular cavities 104. The circular water spray holes 105 spray water to drive away attached organisms and avoid the accumulation of organisms that would cause distortion in the strain transmission of the sensor.

[0041] During the bending process of the submarine cable, the bending strain of the submarine cable is monitored in real time by the fiber optic grating sensor 108, and the wavelength offset is converted into curvature data. Since the circular water jet hole 105 and the annular cavity 104 are connected, when the circular connecting block 102 is placed on the seabed, seawater will enter the annular cavity 104 from the circular water jet hole 105. The annular cavity 104 is connected to the hollow rubber block 103, and seawater will enter the hollow rubber block 103 from the annular cavity 104. When the hollow rubber block 103 is in contact due to bending, the compression of the adjacent hollow rubber blocks 103 will cause seawater to be sprayed into the sea from the circular water jet hole 105.

[0042] like Figure 8 As shown, several cables 107 are installed inside the submarine cable sleeve 106.

[0043] The water sprayed from the circular nozzle 105 will impact the outer wall of the cable sleeve 106, driving away algae and shellfish that enter the device through the gaps between the circular connecting blocks 102, thereby preventing algae and shellfish from affecting the cable.

[0044] like Figure 8 As shown, two annular threaded plates 202 are respectively threaded with pentagram head bolts 203.

[0045] Subsequently, using a special tool, the two pentagonal head bolts 203 located at the beginning and end are rotated respectively, causing them to rotate in opposite directions, i.e., moving away from each other. During the rotation, the pentagonal head bolts 203 engage with the annular threaded plates 202 fixed on the end connecting block 101 and the beginning annular block 1, thereby moving outward axially under the action of threaded transmission. As the pentagonal head bolts 203 advance axially...

[0046] like Figure 6 As shown, several elastic limiting threaded plates 204 are fixedly installed at the ends of the two annular threaded plates 202 that are far apart from each other. Each elastic limiting threaded plate 204 has a threaded groove. Limiting ends 205 are fixedly installed at the ends of the several elastic limiting threaded plates 204 that are far apart from the circular connecting block 102.

[0047] Its front end gradually enters and acts on the thread grooves of several circumferentially distributed elastic limiting thread plates 204. Since the root of the elastic limiting thread plate 204 has elastic deformation capability and its circumferential position is restricted, it cannot rotate with the bolt. Therefore, under the thrust of the pentagram head bolt 203, each elastic limiting thread plate 204 produces radially inward elastic contraction.

[0048] like Figure 4 As shown, trapezoidal rubber blocks 206 are fixedly installed on the inner side of several elastic limiting threaded plates 204, and the materials of the trapezoidal rubber blocks 206 and the submarine cable sleeve 106 are all rubber.

[0049] The whole structure tends to converge towards the center. This radial contraction motion causes several trapezoidal rubber blocks 206 connected to its ends to move towards the central axis of the cable sleeve 106 in a synchronized manner. When the trapezoidal rubber blocks 206 come into contact with the outer wall of the cable sleeve 106, the clamping force gradually increases as the pentagonal head bolts 203 continue to rotate, so that the trapezoidal rubber blocks 206 are tightly attached to the surface of the cable sleeve 106, achieving a firm radial clamping.

[0050] like Figure 4 As shown, two limiting grooves 207 are respectively opened on one side of several trapezoidal rubber blocks 206 that are close to each other, and several annular limiting blocks 208 are provided on the outer wall of the submarine cable sleeve 106, and the several limiting grooves 207 are all adapted to the annular limiting blocks 208.

[0051] During this process, the limiting groove 207 set inside the trapezoidal rubber block 206 gradually aligns with and finally engages with the pre-set protruding annular limiting block 208 on the outer wall of the submarine cable sleeve 106, forming a mechanical limiting fit. Through the above operation, the first annular block 1, several circular connecting blocks 102 and the last connecting block 101 are fixed as a whole on the submarine cable sleeve 106. When the submarine cable vibrates or undergoes axial displacement due to environmental loads such as waves and ocean currents, the mechanical engagement structure between the limiting groove 207 and the annular limiting block 208 can effectively limit the axial sliding of the device along the submarine cable, prevent it from falling off or displacing, and ensure the long-term stability and safety of the device under complex marine conditions.

[0052] In use, the first annular block 1, several circular connecting blocks 102, and the last connecting block 101 are sequentially fitted onto the outer circumference of the submarine cable sleeve 106. The annular components are spliced ​​together axially to form a detachable annular integral structure, facilitating on-site installation during submarine cable laying or maintenance. Subsequently, using a special tool, the two pentagonal head bolts 203 located at the first and last ends are rotated in opposite directions, i.e., moving away from each other. During rotation, the pentagonal head bolts 203 engage with the annular threaded plates 202 fixed on the last connecting block 101 and the first annular block 1, thereby moving outward axially under the action of threaded transmission. As the pentahead bolt 203 is axially advanced, its front end gradually enters and acts on the thread grooves of several circumferentially distributed elastic limiting thread plates 204. Because the root of the elastic limiting thread plate 204 has elastic deformation capability and its circumferential position is restricted, it cannot rotate with the bolt. Therefore, under the thrust of the pentahead bolt 203, each elastic limiting thread plate 204 undergoes radially inward elastic contraction, exhibiting an overall centripetal convergence trend. This radial contraction motion drives several trapezoidal rubber blocks 206 connected to their ends to synchronously approach the central axis of the cable sleeve 106. When the trapezoidal rubber blocks 206 contact the outer wall of the cable sleeve 106, as the pentahead bolt 203 continues to rotate, the clamping force gradually increases, causing the trapezoidal rubber blocks 206... The device fits tightly against the surface of the cable sleeve 106, achieving a firm radial clamping. During this process, the limiting groove 207 set inside the trapezoidal rubber block 206 gradually aligns with and finally engages with the pre-set protruding annular limiting block 208 on the outer wall of the cable sleeve 106, forming a mechanical limiting fit. Through the above operations, the first annular block 1, several circular connecting blocks 102 and the last connecting block 101 are fixed as a whole on the cable sleeve 106. When the cable vibrates or undergoes axial displacement due to environmental loads such as waves and ocean currents, the mechanical engaging structure between the limiting groove 207 and the annular limiting block 208 can effectively limit the axial sliding of the device along the cable, preventing it from falling off or displacing, and ensuring the long-term stability and safety of the device under complex marine conditions.

[0053] After the device is installed, the submarine cable is laid on the seabed. When encountering harsh marine environments such as typhoons or strong waves, the impact of the waves will cause the submarine cable and the installed device to shift and drift on the seabed. At this time, the submarine cable will oscillate irregularly under the influence of water currents and undergo varying degrees of bending deformation. As the submarine cable bends, the fiber optic grating sensor 108 fixed to it deforms synchronously, enabling real-time and accurate monitoring of the cable's bending state. Through fiber optic sensing technology, the system can continuously acquire the bending angle and curvature changes of the submarine cable, achieving high-precision measurement of the bending degree, with a measurement accuracy of ±0.1°, providing data support for the safe operation of the submarine cable. The bending deformation of the submarine cable will be transmitted to several externally fixed circular connecting blocks 102, causing them to undergo relative bending motion. Under the coordinated limiting action of the limiting rod 201 and the connecting plate 2, the relative movement between each circular connecting block 102 is constrained within a controllable left and right swing range, avoiding the risk of structural loosening, collision or stress concentration caused by free swing of the device, and improving the stability of the overall structure. When the bending degree of the submarine cable increases, the adjacent circular connecting blocks 102 will come into contact due to axial proximity. During the contact process, the hollow rubber block 103 set on the end face of the circular connecting block 102 first achieves buffer contact. The hollow rubber block 103 is made of rubber material with good elasticity and seawater corrosion resistance, and has excellent energy absorption and buffering performance, which can effectively alleviate the rigid collision between adjacent connecting blocks and extend the service life of the device.

[0054] During the bending deformation of the submarine cable, the fiber optic grating sensor 108 monitors the bending strain state of the cable in real time. When the cable bends, the sensor's internal grating period changes due to deformation, causing a shift in the reflected light wavelength. The system detects this wavelength shift and, combined with a calibration algorithm, accurately converts it into corresponding curvature data, achieving continuous and high-precision dynamic monitoring of the cable's bending state. Simultaneously, since the circular water jet 105 is interconnected with the annular cavity 104, after the circular connecting block 102 is placed on the seabed... Under water pressure, seawater naturally flows into the annular cavity 104 through the circular jet hole 105. Since the annular cavity 104 is connected to the hollow rubber block 103 inside, the seawater further fills the hollow cavity of the hollow rubber block 103, bringing it into a state of pressure equilibrium with the external seawater. When the submarine cable bends rapidly due to waves or ocean currents, the adjacent circular connecting blocks 102, as they approach each other, cause the hollow rubber blocks 103 at their ends to come into contact. At this time, the seawater inside the hollow rubber block 103 is compressed... The instantaneous pressure increase, due to the small outlet diameter of the circular water jet 105, creates a certain fluid resistance, leading to a further increase in internal pressure. This significantly enhances the buffering force between the hollow rubber blocks 103. This "hydraulic buffering" effect effectively absorbs the energy of structural collisions, reduces the impact intensity, and further reduces the risk of mechanical damage caused by severe bending or instantaneous overload. More importantly, this buffering mechanism can effectively reduce the local stress concentration on the fiber optic grating sensor 108, preventing it from breaking or degrading due to excessive bending or impact, thus ensuring its long-term stable operation and the reliability of its real-time measurement function. In addition, the seawater ejected from the circular water jet 105 forms a directional jet under pressure, scouring the outer wall of the submarine cable sleeve 106 and the gap area between the circular connecting blocks 102. This water flow can effectively drive away or wash away marine organisms such as algae and shellfish that invade from the gaps, preventing them from accumulating inside the device and causing corrosion, blockage, or affecting the structural performance, further improving the durability and maintainability of the device in complex marine environments.

[0055] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A bending measurement device for submarine cable laying, comprising a head-end annular block (1) and a submarine cable sleeve (106), characterized in that, Also includes: The fiber optic measurement unit includes a fiber optic grating sensor (108) installed inside the cable sheath (106). The fiber optic grating sensor (108) is connected to the deck monitoring system via an armored optical cable, converts the wavelength offset signal into curvature data and triggers an alarm. The fiber optic grating sensor (108) detects the curvature of the cable by real-time monitoring of the fiber wavelength offset. The connecting mechanism includes a plurality of circular connecting blocks (102) and an end connecting block (101) arranged sequentially behind the first end annular block (1). The submarine cable sleeve (106) passes through the first end annular block (1), the plurality of circular connecting blocks (102) and the end connecting block (101). A buffer mechanism is provided on several circular connecting blocks (102) and an end connecting block (101). The buffer mechanism includes two connecting plates (2) that are fixedly installed on the outer walls of the several circular connecting blocks (102) and the end connecting block (101). Two limiting rods (201) are fixedly installed on the several circular connecting blocks (102) and the first annular block (1). The several limiting rods (201) rotate through the several connecting plates (2). The side of the end connecting block (101) and the first annular block (1) away from the circular connecting blocks (102) is provided with annular threaded plates (202). The buffer mechanism is used to limit the lateral swing amplitude of the circular connecting blocks (102). The connecting mechanism also includes two hollow rubber blocks (103) that are respectively fixedly installed on the back of the first end annular block (1), the front and back of several circular connecting blocks (102), and the front of the end connecting block (101), wherein the side closer to the first end annular block (1) is the front and the side closer to the end connecting block (101) is the back; The first annular block (1), several circular connecting blocks (102) and the last connecting block (101) are respectively provided with annular cavities (104). Circular water spray holes (105) are respectively provided on the inner walls of the first annular block (1), several circular connecting blocks (102) and the last connecting block (101). Several circular water spray holes (105) are respectively connected to several annular cavities (104). The annular cavities (104) are connected to the hollow rubber block (103). The circular water spray holes (105) spray water to drive away attached organisms and avoid the accumulation of organisms that would cause distortion in the strain transmission of the sensor.

2. The bending measurement device for submarine cable laying according to claim 1, characterized in that: The submarine cable sleeve (106) contains several cables (107).

3. The bending degree measuring device for submarine cable laying according to claim 1, characterized in that: The two annular threaded plates (202) are respectively threaded with pentagonal head bolts (203).

4. The bending degree measuring device for submarine cable laying according to claim 1, characterized in that: A plurality of elastic limiting threaded plates (204) are fixedly installed on the ends of the two annular threaded plates (202) that are far apart from each other. Each of the elastic limiting threaded plates (204) has a threaded groove. Each of the elastic limiting threaded plates (204) has a limiting end (205) fixedly installed on the ends of the elastic limiting threaded plates (204) that are far apart from the circular connecting block (102).

5. The bending degree measuring device for submarine cable laying according to claim 4, characterized in that: A trapezoidal rubber block (206) is fixedly installed on the inner side of several elastic limiting threaded plates (204), and the materials of the trapezoidal rubber block (206) and the submarine cable sleeve (106) are both rubber.

6. The bending degree measuring device for submarine cable laying according to claim 5, characterized in that: Two limiting grooves (207) are respectively opened on one side of the trapezoidal rubber blocks (206) that are close to each other. Several annular limiting blocks (208) are provided on the outer wall of the submarine cable sleeve (106). The limiting grooves (207) are all adapted to the annular limiting blocks (208).

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