Submarine cable vertical snakelike laying landing ditch structure
By using a vertical serpentine laying trench structure for submarine cables, and combining anchoring wells, transition wells, and vertical serpentine laying trenches, the axial thrust problem of submarine cables during straight laying was solved, thereby improving the stability and reliability of submarine cables.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-15
- Publication Date
- 2026-04-10
AI Technical Summary
When submarine cables are laid in a straight line, the axial thrust caused by thermal expansion and contraction leads to lateral displacement and creep, which affects the safe and stable operation of the submarine cables. The existing serpentine laying method has not completely solved this problem.
The landing trench structure for vertical serpentine laying of submarine cables is adopted, including anchoring wells, transition wells and vertical serpentine laying trenches. The submarine cables are fixed by anchoring devices, installation brackets and submarine cable fixing clips. The transition wells are filled with cement and sand mixture and brick walls are set up to isolate and seal them, thereby reducing the axial thrust of the submarine cables.
It effectively absorbs the thermal expansion and contraction changes of submarine cables, improves the stability and reliability of submarine cable operation, and reduces the risk of submarine cable displacement and damage.
Smart Images
Figure CN224110851U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a submarine cable laying technical field especially relates to a vertical serpentine laying landing trench structure of submarine cable. BACKGROUND
[0002] When the submarine cable is running, thermal expansion and contraction will occur with the change of load current and environmental temperature, and the axial thrust acting on the submarine cable will accompany this phenomenon. The larger the cross section, the higher the load current, and the greater the axial thrust generated. When the submarine cable is laid in a straight line, the huge axial thrust will cause the submarine cable line to displace horizontally at a certain part, thereby generating excessive bending, which endangers the submarine cable and its accessory facilities and causes line failure. In addition, the core and metal sheath will also produce creep due to the multiple cycles of thermal expansion and contraction, which will cause the displacement, sliding, and even damage of the running submarine cable.
[0003] To avoid the above situations, the current land cable generally adopts serpentine laying to absorb the thermal expansion and contraction variation generated during operation. Serpentine laying is a kind of submarine cable laying method that arranges the submarine cable in a wave shape. The artificially set wave width can effectively prevent the thermal expansion of the submarine cable from concentrating on a certain part of the line, thereby controlling the thermal expansion bending of the submarine cable. Due to the particularity of the laying method, the application of serpentine laying has not been seen yet, but the axial thrust still exists during the operation of the submarine cable, which seriously affects the safe and stable operation of the submarine cable.
[0004] Therefore, a vertical serpentine laying landing trench structure of submarine cable is proposed to solve the above problems. UTILITY MODEL CONTENT
[0005] In order to solve the above problems existing in the prior art, the utility model provides a vertical serpentine laying landing trench structure of submarine cable.
[0006] The technical scheme of the utility model is as follows:
[0007] A vertical serpentine laying landing trench structure of submarine cable, comprising an anchor well, a transition well, and a vertical serpentine laying trench, the anchor well is arranged adjacent to the land segment on one side, and the anchor well is fixedly installed with the submarine cable through an anchoring device inside; the transition well is arranged on the other side of the anchor well, and the anchor well and the transition well are both located above the high tide level; the wave crest and the wave trough of the serpentine segment of the vertical serpentine laying trench are fixed with the submarine cable through installation supports and submarine cable fixing clips; a brick wall is arranged in the middle part of the vertical serpentine laying trench for partition and plugging.
[0008] Preferably, the length of the transition well is greater than the length of the submarine cable from the anchor point to the wave trough in the vertical serpentine laying trench.
[0009] Preferably, the transition well is filled with a cement-sand mixture.
[0010] Preferably, the cement-sand mixture adopts a ratio of 1:14 of cement to sand, and the thermal resistance coefficient of the mixed configuration is 1K*m / W.
[0011] Preferably, the transition well is provided with a brick wall on both sides for partitioning and plugging.
[0012] Preferably, the trough of the vertical serpentine laying trench is fixed to the trench bottom through a submarine cable fixing clamp provided with a fixing bolt, and a gasket is arranged between the submarine cable and the trench bottom; the peak of the vertical serpentine laying trench is provided with a mounting bracket fixed to the trench side wall through a fixing bolt, and the submarine cable fixing clamp fixes the submarine cable to the top surface of the mounting bracket.
[0013] Preferably, the submarine cable fixing clamp comprises rubber, a gasket and a card, the card is in the shape of a U and clamps the submarine cable, the rubber is arranged between the submarine cable and the inner wall of the card, and the gasket is arranged at the bottom of the submarine cable.
[0014] Preferably, the distance between the mounting brackets arranged between the peaks of the vertical serpentine laying trench is greater than or equal to 3m.
[0015] The utility model has the advantages that the utility model provides a novel submarine cable vertical serpentine laying landing trench laying and fixing structure, which can meet the serpentine laying requirements of the submarine cable landing section, reduce the axial thrust borne by the submarine cable during operation, and improve the stability and reliability of the submarine cable operation. BRIEF DESCRIPTION OF DRAWINGS
[0016] Figure 1 It is a whole structure schematic view of the utility model;
[0017] Figure 2 It is a serpentine laying trough A-A fixed section schematic view of the utility model;
[0018] Figure 3 It is a serpentine laying peak B-B fixed section schematic view of the utility model;
[0019] Figure 4 It is a whole structure schematic view of the utility model Figure 2 It is an enlarged schematic view of the submarine cable fixing clamp structure at G of the utility model.
[0020] The reference signs in the drawing represent:
[0021] 1, on-road section; 2, anchoring well; 3, anchoring device; 4, transition well; 5, vertical serpentine laying trench; 6, submarine cable trench cover plate; 7, submarine cable fixing clamp; 701, rubber; 702, gasket; 703, card; 8, cement-sand mixture; 9, brick wall; 10, submarine cable; 11, half serpentine laying section; 12, mounting bracket. DETAILED DESCRIPTION
[0022] Clearly, the described embodiments are merely a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.
[0023] Referring to Figures 1 to 4 , a seabed submarine cable vertical serpentine laying landing trench structure comprises an anchoring well 2, a transition well 4 and a vertical serpentine laying trench 5, the anchoring well 2 is arranged adjacent to the onshore section 1 on one side, and the anchoring well 2 is fixedly installed with the submarine cable 10 through an anchoring device 3 inside; the transition well 4 is arranged on the other side of the anchoring well 2, and the anchoring well 2 and the transition well 4 are both located above the high tide level; the wave crest and the wave trough of the serpentine section of the vertical serpentine laying trench 5 are fixed with the submarine cable 10 through installation supports 12 and submarine cable fixing clips 7; the middle part of the vertical serpentine laying trench 5 is partially provided with a brick wall 9 for partitioning and plugging.
[0024] Referring to Figure 1 , the length of the transition well 4 is greater than the length of the submarine cable 10 from the anchoring point to the wave trough in the vertical serpentine laying trench 5, so as to avoid the anchoring well 2 and the transition well 4 being submerged by the rising tide, and the anchoring well 2 and the incoming line of the submarine cable 10 need to be reliably anchored, so as to prevent the submarine cable 10 on both sides from deviating; the transition well 4 is filled with a cement-sand mixture 8, the proportion of cement to sand is 1:14, and the thermal resistance coefficient of the mixed configuration is 1 K*m / W; the two sides of the transition well 4 are both provided with a brick wall 9 for partitioning and plugging, so as to prevent seawater from flowing into the anchoring well 2 or flowing to the onshore section 1 through the anchoring well 2.
[0025] Referring to Figures 2 to 4 , the wave trough of the vertical serpentine laying trench 5 is fixed with the trench bottom through the submarine cable fixing clip 7 after being provided with the submarine cable fixing clip 7 through a fixing bolt, and a gasket 702 is arranged between the submarine cable 10 and the trench bottom; the submarine cable fixing clip 7 comprises rubber 701, the gasket 702 and a card 703, the card 703 is in the shape of a U and clamps the submarine cable 10, the rubber 701 is arranged between the submarine cable 10 and the inner wall of the card 703, and the gasket 702 is arranged at the bottom of the submarine cable 10; the installation support 12 is arranged at the wave crest of the vertical serpentine laying trench 5.
[0026] Referring to Figure 3 , the length of the installation support 12 fixed at the wave crest of the vertical serpentine laying trench 5 is adapted to the size of the channel, the installation support 12 is fixed with the side wall of the trench through a fixing bolt, and the submarine cable fixing clip 7 fixes the submarine cable 10 on the top surface of the installation support 12; the spacing of the installation supports 12 arranged between a plurality of wave crests of the vertical serpentine laying trench 5 is greater than or equal to 3 meters, and the installation support 12 needs to consider the requirements of the strength of the support under the self-weight of the submarine cable and the electric power of short circuit.
[0027] The utility model discloses a working principle:
[0028] In the utility model, the vertical serpentine laying ditch 5 is considered according to 8 meters of single segment vertical serpentine laying length, sets up two segments serpentine laying and considers 16 meters, and each serpentine laying segment is fixedly arranged mounting bracket 12 with submarine cable fixed clamps 7 and is fixed at the highest point and the lowest point, and each segment vertical laying landing ditch is designed gradually according to 0.5 meters height difference, and the middle part of serpentine laying ditch adopts brick wall 9 to carry out plugging partition locally, prevents backfilling sand loss, and this can satisfy the submarine cable serpentine laying requirement;The anchor well 2 is arranged on one side close to the land segment 1, and the anchor well 2 is fixedly installed submarine cable 10 in the anchor well 2 through anchoring device 3;The transition well 4 is arranged on the other side of the anchor well 2, and the anchor well 2 and the transition well 4 are all above high tide level, for avoiding sea water submerging the anchor well 2 and the transition well 4 when tide rises, and the anchor well 2 and the incoming line of submarine cable 10 need reliable anchoring, for preventing the deviation of submarine cable 10 on both sides;The transition well 4 is filled with cement sand mixture 8, and the proportion of cement and sand is 1:14, and the thermal resistance coefficient of the mixed configuration is 1K*m / W;The both sides of the transition well 4 are provided with brick wall 9 for partition plugging, for preventing sea water from flowing into the anchor well 2 or flowing to the land segment 1 through the anchor well 2.
[0029] The wave crest and the wave trough of the serpentine segment of the vertical serpentine laying ditch 5 are fixed with the submarine cable 10 through the mounting bracket 12 and the submarine cable fixed clamps 7;The middle part of the vertical serpentine laying ditch 5 is provided with the brick wall 9 for partition plugging;The wave trough of the vertical serpentine laying ditch 5 is fixed with the submarine cable fixed clamps 7 through the fixing bolt, and the gasket 702 is arranged between the submarine cable 10 and the bottom of the ditch;The submarine cable fixed clamps 7 comprise rubber 701, gasket 702 and card 703, the card 703 is in the shape of several Chinese characters and is connected with the submarine cable 10, the rubber 701 is arranged between the submarine cable 10 and the inner wall of the card 703, and the gasket 702 is arranged at the bottom of the submarine cable 10;The wave crest of the vertical serpentine laying ditch 5 is provided with the mounting bracket 12;The length of the mounting bracket 12 fixed at the wave crest of the vertical serpentine laying ditch 5 is adapted to the size of the channel, the mounting bracket 12 is fixed with the side wall of the ditch through the fixing bolt, and the submarine cable fixed clamps 7 fix the submarine cable 10 on the top surface of the mounting bracket 12;The spacing of the mounting bracket 12 arranged between the wave crests of the vertical serpentine laying ditch 5 is greater than or equal to 3 meters, and the self weight of the submarine cable 10 and the requirement of the strength of the mounting bracket 12 when the electric power is short-circuited need to be considered when the mounting bracket 12 is designed.
[0030] The utility model realizes the reasonable serpentine laying design, mainly determines the value of the slip amount n of the submarine cable 10 serpentine laying, according to formula:
[0031]
[0032] Wherein: m is the thermal expansion of the submarine cable 10 (mm); B is the serpentine amplitude (mm); L is the half of the serpentine length (mm), n is the transverse slip of the submarine cable 10 (mm), as shown in the following figure:
[0033]
[0034] The formula for calculating the thermal expansion of the submarine cable is as follows:
[0035]
[0036] Wherein, t is the temperature rise of the conductor (℃), α is the linear expansion coefficient of the submarine cable 10 (1 / ℃), L is the half of the serpentine length (mm), μ is the friction coefficient, W is the weight per unit length of the submarine cable 10 (N / mm), f is the reaction force of the submarine cable 10 (N), A is the cross section of the conductor (mm2), and E is the Young's modulus of the submarine cable 10 (N / mm2). As can be seen from the formula, the larger the cross section A of the submarine cable 10, the greater the thermal expansion, and the greater the transverse slip. The axial force of the serpentine arc of the submarine cable 10 is shown in the following table:
[0037] Table 1: Formula for calculating the axial force of the serpentine arc
[0038]
[0039] Wherein: EI is the bending stiffness of the submarine cable (N·mm2), and as can be seen from the formula, the greater the transverse slip m of the submarine cable, the greater the transverse slip n of the submarine cable, and the greater the axial force of the serpentine arc of the submarine cable 10 when the temperature changes.
[0040] The serpentine laying form can be selected as horizontal serpentine laying and vertical serpentine laying. Both of these two laying forms can meet the requirements of thermal expansion of the submarine cable. According to the formula and combined with the actual accumulated operation experience, the serpentine length of the submarine cable 10 line is generally 6 to 12 m, and the serpentine arc amplitude is generally 1D to 1.5D (D is the outer diameter of the submarine cable). The vertical serpentine laying does not occupy the transverse width like the horizontal serpentine laying, which can save the laying space to the maximum extent, but it is more difficult to accurately control the wave amplitude during construction. In addition, when the vertical serpentine laying is adopted, the installation support 12 can be arranged at the wave peak, and the spacing of the installation support 12 is generally larger, which needs to be greater than or equal to 3 m. When designing the installation support 12, the requirements of the strength of the installation support 12 due to the self-weight of the submarine cable 10 and the electric force in the short circuit need to be considered. Although the horizontal serpentine laying occupies more space, the construction is relatively easy.
[0041] The longer the serpentine length of the serpentine laid submarine cable 10 line, the greater the axial expansion thrust. Once the serpentine length is determined, increasing the arc amplitude can reduce the axial expansion thrust and the transverse slip of the serpentine arc. When the serpentine laying is adopted, the spacing of the installation support 12 depends on the serpentine length. The longer the serpentine length, the fewer the number of submarine cable supports required, but the space occupied by the submarine cable 10 is correspondingly larger.
[0042] The landing trench length is 16m, and is divided into two complete serpentine laying sections, each with a length of 8m. In order to fully utilize the height of the landing trench and reduce the width of the landing trench, vertical serpentine laying is adopted. The serpentine amplitude is 700mm, the maximum outer diameter of the submarine cable is about 200mm, and the value of the patent is greater than the conventional 1D-1.5D serpentine amplitude value, so as to further reduce the axial expansion thrust of the large-section submarine cable 10.
[0043] The above is only an embodiment of the present application, and does not limit the patent range of the present application, and any equivalent structure or equivalent process transformation using the content of the present application specification and drawings, or direct or indirect application in other related technical fields, are also included in the patent protection range of the present application.
Claims
1. A subsea sea cable vertical serpentine lay land trench structure, characterized by: The application relates to a submarine cable laying device, which comprises an anchoring well (2), a transition well (4) and a vertical serpentine laying ditch (5), the anchoring well (2) is arranged close to a land section (1) on one side, and the anchoring well (2) is internally fixedly arranged with a submarine cable (10) through an anchoring device (3); the transition well (4) is arranged on the other side of the anchoring well (2), and the anchoring well (2) and the transition well (4) are both located above a high tide level; the wave crest and the wave trough of a serpentine section of the vertical serpentine laying ditch (5) are fixed with the submarine cable (10) through a mounting support (12) and a submarine cable fixing clamp (7); and a brick wall (9) is arranged in the middle of the vertical serpentine laying ditch (5) to be partially partitioned and blocked.
2. A subsea sea cable vertical serpentine land trench structure according to claim 1, characterised in that: The length of the transition well (4) is greater than the length of the submarine cable (10) from an anchoring point to the wave trough of the vertical serpentine laying ditch (5).
3. A subsea sea cable vertical serpentine land trench structure according to claim 2, characterised in that: The transition well (4) is filled with a cement-sand mixture (8).
4. A subsea sea cable vertical serpentine land trench structure according to claim 3, characterised in that: The cement-sand mixture (8) adopts a cement-sand ratio of 1:14, and the thermal resistance coefficient of the mixed configuration is 1 K*m / W.
5. A subsea sea cable vertical serpentine land trench structure according to claim 3, characterised in that: Both sides of the transition well (4) are provided with brick walls (9) for partitioning and blocking.
6. A subsea sea cable vertical serpentine land trench structure according to claim 1, characterized in that: The wave trough of the vertical serpentine laying ditch (5) is fixed with the ditch bottom through the submarine cable fixing clamp (7) after being penetrated by a fixing bolt, and a gasket (702) is arranged between the submarine cable (10) and the ditch bottom; the wave crest of the vertical serpentine laying ditch (5) is provided with a mounting support (12), the mounting support (12) is fixed with the ditch side wall through a fixing bolt, and the submarine cable fixing clamp (7) fixes the submarine cable (10) on the top surface of the mounting support (12).
7. A subsea sea cable vertical serpentine land trench structure according to claim 6, characterised in that: The submarine cable fixing clamp (7) comprises rubber (701), a gasket (702) and a card (703), the card (703) is in a U-shaped shape and is used for clamping the submarine cable (10), the rubber (701) is arranged between the submarine cable (10) and the inner wall of the card (703), and the gasket (702) is arranged at the bottom of the submarine cable (10).
8. A subsea sea cable vertical serpentine land trench structure according to claim 6, characterised in that: The spacing of the mounting supports (12) arranged between the wave crests of the vertical serpentine laying ditch (5) is greater than or equal to 3 meters.