Light submarine cable connecting method

Abstract

The invention relates to the technical field of submarine cable manufacturing, and provides a light submarine cable connecting method, which comprises the following steps of: sequentially removing an outer sheath, a semi-conductive layer, a lead sheath and an insulation shielding layer of a light submarine cable according to a preset length, polishing the surface of an insulation layer at the connecting end of the two light submarine cables, and simultaneously performing auxiliary cooling; removing the insulating coating layer of each monofilament in the light submarine cable in a layering manner, and recovering the stranded structure of the conductor; carrying out crimping processing on the conductor at the connecting end of the light submarine cable by using a connecting pipe; performing surface treatment on the connecting pipe and the insulating layer; mounting a main body of the intermediate joint; the semi-conductive layer, the lead sheath, the outer sheath and the armor layer are recovered. According to the light submarine cable connection method provided by the invention, the electrical and mechanical properties of the connection points can be ensured, faults caused by poor contact or insufficient insulation of the connection ends of the light submarine cables are prevented, the compatibility and matching of connection of the light submarine cables are ensured, and the consistency of the appearance of the insulation layer and the stability of the insulation performance are ensured.

Description

Technical Field

[0001] The invention relates to the technical field of submarine cable manufacturing, and in particular to a light submarine cable connection method. Background Art

[0002] With the increasing global awareness of environmental protection, the application of light submarine cables is increasing, and the use of supporting accessories of light submarine cables is also increasing. For the connection of two sections of light submarine cables, the connection of conductors has become the focus.

[0003] For conventional submarine cables, the conductors of two sections of submarine cables are crimped after being connected. The conductor surface of the light submarine cable has an insulating coating layer, which can reduce losses and increase the current-carrying capacity of the light submarine cable. If the same treatment is performed on the conductor connection of the conventional submarine cable, the conductor connection will heat up, causing a safety accident. In addition, the insulating material of the light submarine cable is polypropylene, which can increase the operating temperature of the cable conductor. If it is polished like the insulating material of the ordinary submarine cable, the insulating layer will soften and adhere during the polishing process, affecting the insulation performance of the product. Summary of the invention

[0004] The present invention provides a light submarine cable connection method, which is used to solve the problem in the prior art that it is difficult to connect the light submarine cable, which affects the stability and reliability of the light submarine cable after connection.

[0005] The present invention provides a method for connecting a light submarine cable, comprising: removing the outer sheath, the semi-conductive layer, the lead sheath and the insulating shielding layer of the light submarine cable in sequence according to a preset length, and polishing the surface of the insulating layer of the connecting ends of two light submarine cables and performing auxiliary cooling at the same time; Remove the insulating coating layer of each single wire in the lightweight submarine cable in layers and restore the stranding structure of the conductor; Use the connecting tube to crimp the conductor at the connecting end of the light submarine cable; Carry out surface treatment on the connecting pipe and the insulation layer; Install the main body of the intermediate joint; Restore the semi-conductive layer, lead sheath, outer sheath and armor layer.

[0006] According to a light submarine cable connection method provided by the present invention, the step of removing the insulating coating layer of each monofilament in the light submarine cable in layers and restoring the twisted structure of the conductor comprises: Remove the insulation layer from the two light submarine cable connection ends; Separate the twisted monofilaments of the conductor and remove the water-blocking tape on the outside of each monofilament; Each monofilament is sanded to remove the insulating coating; Re-twist each filament in the same direction as before.

[0007] According to a light submarine cable connection method provided by the present invention, the step of removing the insulating coating layer of each monofilament in the light submarine cable in layers and restoring the twisted structure of the conductor also includes: Put the main body of the middle joint and several heat shrink tubes into the outer sheaths of two light submarine cables and remove the longer one; put several heat shrink tubes into the outer sheaths of two light submarine cables and remove the shorter one.

[0008] According to a light submarine cable connection method provided by the present invention, the step of using a connecting tube to crimp the conductor at the connecting end of the light submarine cable comprises: Slip the connecting tube onto the outside of the conductor at the connecting end of the light submarine cable and crimp it; Grind and clean the crimped tube after crimping.

[0009] According to a light submarine cable connection method provided by the present invention, the step of surface treating the connection tube and the insulation layer comprises: Winding a semi-conductive tape on the outside of the connecting tube so that the outer diameter of the semi-conductive tape is flush with the outer diameter of the insulating layer; Clean the insulation layer of the light submarine cable connection end and apply lubricant.

[0010] According to a light submarine cable connection method provided by the present invention, the step of installing the main body of the intermediate joint comprises: Mark the center position of the connecting pipe, and mark the installation reference position and check position of the main body of the intermediate joint; Remove the longer outer sheath of the two light submarine cables and move the main body of the intermediate joint to the installation reference position; Based on the check position and the center position, the support strip in the main body of the middle joint is pulled out to reset the main body of the middle joint.

[0011] According to a light submarine cable connection method provided by the present invention, the step of restoring the semiconductive layer, the lead sheath, the outer sheath and the armor layer comprises: Using waterproof mastic to form a first inner water-blocking layer at both ends of the main body of the middle joint; A semi-conductive self-adhesive tape is used to form a conductive layer at the connection between the two ends of the body of the intermediate joint and the lead sheath; A copper shielding mesh is wound between two lead sheaths on both sides of the main body of the middle joint, and the copper braided wire and the copper shielding mesh are fixed on the two lead sheaths; Using waterproof mastic to form a second inner water-blocking layer at both ends of the main body of the middle joint; Use waterproof insulating tape to overlap the outer sheath to form a third inner water-blocking layer; Wrap the armor layer around the middle joint.

[0012] According to a lightweight submarine cable connection method provided by the present invention, the step of restoring the semi-conductive layer, the lead sheath, the outer sheath and the armor layer further comprises: installing a heat shrink tube; The step of installing the heat shrink tube includes: wrapping two layers of waterproof glue around the end and overlapped portion of the heat shrink tube; Take a heat shrink tube at each end of the main body of the middle joint and move it to the target position, and heat it to shrink the two heat shrink tubes; Then move the third heat shrink tube to the target position and heat it to shrink it.

[0013] A light submarine cable connection method provided by the present invention further includes: pre-processing the light submarine cable; The step of pre-processing the light submarine cable comprises: Straightening of light submarine cables; Remove the outer layer of the light submarine cable connection end; Keep the 100mm armor layer, inner lining sheath and bag on the outer sheath of the light submarine cable, and remove the remaining armor layer, inner lining sheath and bag; The three-phase submarine cable and the optical fiber unit are separated to obtain a single-phase submarine cable.

[0014] According to a light submarine cable connection method provided by the present invention, a cable cleaning towel or anhydrous ethanol is used to assist in cooling the surface of the insulation layer.

[0015] The light submarine cable connection method provided by the present invention removes the insulating coating layer of each single wire of the light submarine cable and restores the twisted structure of the conductor, so that when two sections of the light submarine cable are connected, the insulating coating layer of the conductor is removed in layers. When the conductors of the two sections of the light submarine cable are connected, the electrical and mechanical properties of the connection point can be ensured, and failures caused by poor contact or insufficient insulation can be prevented, thereby ensuring the compatibility and matching of the light submarine cable connection, thereby ensuring the stability and reliability of the connection of the light submarine cable. At the same time, when the surface of the insulating layer of the connecting end of the light submarine cable is polished, auxiliary cooling is performed at the same time, so that the polypropylene material of the light submarine cable is prevented from softening and adhering during the polishing process, thereby ensuring the consistency of the appearance of the insulating layer and the stability of the insulation performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1It is a schematic diagram of the flow of the light submarine cable connection method provided by the present invention.

[0018] Figure 2 It is a schematic diagram of a process of removing the insulating coating layer of each monofilament in a light submarine cable in layers and restoring the twisted structure of the conductor provided by the present invention.

[0019] Figure 3 It is a schematic diagram of a process of removing the insulating coating layer of each monofilament in a light submarine cable in layers and restoring the twisted structure of the conductor provided by the present invention.

[0020] Figure 4 It is a schematic diagram of a process of crimping a conductor at a connecting end of a light submarine cable using a connecting tube provided by the present invention.

[0021] Figure 5 It is a schematic diagram of the process of surface treatment of the connecting pipe and the insulating layer provided by the present invention.

[0022] Figure 6 It is a schematic diagram of the process of installing the main body of the intermediate joint provided by the present invention.

[0023] Figure 7 It is a schematic diagram of the process of restoring the semiconductive layer, the lead sheath, the outer sheath and the armor layer provided by the present invention.

[0024] Figure 8 It is a schematic diagram of the process of restoring the semiconductive layer, the lead sheath, the outer sheath and the armor layer provided by the present invention.

[0025] Fig. 9 It is a schematic diagram of the process of pre-processing a light submarine cable provided by the present invention.

[0026] Fig.10 It is a structural schematic diagram of processing a single-phase light submarine cable provided by the present invention.

[0027] Fig.11 It is a schematic diagram of the structure of stripping the insulation layer of the connecting end of the light submarine cable provided by the present invention.

[0028] Fig.12 It is a schematic diagram of the structure of crimping a connecting tube outside a conductor provided by the present invention.

[0029] Fig.13 It is a structural schematic diagram of winding a semi-conductive tape around the outer side of a connecting tube provided by the present invention.

[0030] Fig.14 It is a structural schematic diagram of a main body for installing an intermediate joint provided by the present invention.

[0031] Fig.15 It is a schematic structural diagram of using waterproof mortar to form a first inner water-blocking layer provided by the present invention.

[0032] Fig.16 It is a schematic diagram of the structure of forming a conductive layer using a semi-conductive self-adhesive tape provided by the present invention.

[0033] Fig.17 It is a schematic diagram of the structure provided by the present invention in which the copper braided wire and the copper shielding mesh are fixed on two lead sheaths.

[0034] Fig.18 It is a schematic diagram of the structure of forming a second inner water-blocking layer using waterproof mortar provided by the present invention.

[0035] Fig.19 It is a schematic structural diagram of using a waterproof insulating tape to form a third inner water-blocking layer provided by the present invention.

[0036] Fig. 20 It is a structural schematic diagram of installing a heat shrink tube provided by the present invention.

[0037] Fig.21 It is a structural schematic diagram of the installation armor layer provided by the present invention.

[0038] Reference numerals: 1. Lightweight submarine cable; 11. Outer sheath; 12. Semi-conductive layer; 13. Lead sheath; 14. Insulation shielding layer; 15. Insulation layer; 16. Water-blocking tape; 17. Conductor; 18. Semi-conductive tape; 19. Waterproof putty; 20. Semi-conductive self-adhesive tape; 21. Copper shielding net; 22. Copper braided wire; 23. Constant force spring; 24. Waterproof insulation tape; 25. Armor layer; 2. Connecting tube; 3. Intermediate joint; 31. Main body; 32. Heat shrink tube; 33. Support bar. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are 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 creative work are within the scope of protection of the present invention.

[0040] Combine the following Figure 1-Figure 21 , the lightweight submarine cable connection method provided by the embodiment of the present invention is described in detail through specific embodiments and application scenarios.

[0041] In some embodiments, Figure 1 and Fig.10 As shown, this embodiment provides a method for connecting a light submarine cable 1, comprising the following steps: Step 111, the outer sheath 11, the semi-conductive layer 12, the lead sheath 13 and the insulating shielding layer 14 of the light submarine cable 1 are removed in sequence according to the preset length, and the surface of the insulating layer 15 at the connecting end of the two light submarine cables 1 is polished and auxiliary cooling is performed at the same time.

[0042] It is understandable that the outer sheath 11 of the connecting end of the light submarine cable 1 is processed first, the light submarine cable 1 is straightened first, and then the cut end of the light submarine cable 1 is sawed flat. For the two sections of light submarine cable 1 that need to be connected, the longer end is stripped of the outer sheath 11 of H1 length, and the shorter end is stripped of the outer sheath 11 of H2 length.

[0043] Specifically, the length of H1 can be 500 mm, and the length of H2 can be 350 mm.

[0044] Then, the two sections of light submarine cable 1 are stripped of a certain (C1+B1) and (C2+B2) lead sheath 13 and B1 and B2 lengths of semiconductive layer 12 from the connection ends, and the semiconductive water-resistant tape 16 of D length is retained at the fracture of the lead sheath 13, and the excess lead sheath 13, semiconductive layer 12 and insulating shielding layer 14 are removed, and then the two ends of the outer sheath 11 are roughened with 240# sandpaper and cleaned. Among them, the cut of the semiconductive layer 12 is polished with 400# sandpaper to remove the sharp corners, so that the semiconductive layer 12 and the insulating layer 15 have a smooth transition. The transition between the lead sheath 13 and the semiconductive layer 12 is wrapped with two layers of semiconductive tape, and the semiconductive tape is stretched to 200% of the original length. The semiconductive tape overlaps with the semiconductive layer 12 by 10mm, and overlaps with the lead sheath 13 by more than or equal to 20mm.

[0045] Specifically, B1 and B2 can be 175 mm, C1 and C2 can be 65 mm, and D can be 20 mm.

[0046] Finally, 240# and 400# sandpapers are used successively to polish the surface of the insulating layer 15 to make it smooth. Since the insulating layer 15 of the light submarine cable 1 is made of polypropylene material, which is a thermoplastic plastic, it is easy to soften and cause dust adhesion during polishing. When polishing the polypropylene insulating layer, auxiliary cooling is required at the same time to ensure that the insulating layer 15 does not deform after polishing.

[0047] Step 112 , removing the insulating coating layer of each monofilament in the light submarine cable 1 in layers, and restoring the twisted structure of the conductor 17 .

[0048] It is understandable that since each single wire of the light submarine cable 1 has an insulating coating layer on its surface, the loss can be reduced and the current-carrying capacity of the light submarine cable 1 can be increased. However, if two sections of the light submarine cable 1 are directly connected, the insulating coating layer will easily lead to a lack of good electrical contact at the connection between the two sections of the light submarine cable 1, causing the two connected sections of the submarine cable to heat up and cause safety accidents. Therefore, it is necessary to remove the insulating coating layer of each single wire.

[0049] Step 113 , using the connecting tube 2 to crimp the conductor 17 at the connecting end of the light submarine cable 1 .

[0050] It is understandable that for the conductor 17 at the connecting end of the light submarine cable 1, after the connection, it is necessary to use a connecting tube 2 to sleeve and fix the conductors 17 of the two sections of the light submarine cable 1 so that the conductors 17 of the two sections of the light submarine cable 1 can be stably connected and can transmit electricity.

[0051] Step 114 , performing surface treatment on the connecting tube 2 and the insulating layer 15 .

[0052] It is understandable that after the connecting tube 2 connects the connecting end of the light submarine cable 1, since the outer diameter of the connecting tube 2 is inconsistent with the outer diameter of the insulating layer 15 on both sides, the connection of the light submarine cable 1 has a step-like structure, and it is necessary to process the outer side of the connecting tube 2 and the outer side of the insulating layer 15 to be flush, and clean the connection surface to facilitate the subsequent socketing of the main body 31 of the intermediate joint 3.

[0053] Step 115 , installing the main body 31 of the middle joint 3 .

[0054] It is understandable that the main body 31 of the intermediate joint 3 is installed on the outside of the connecting pipe 2, and the joint of the two sections of light submarine cables 1 is mechanically fixed so that the connecting ends of the two sections of light submarine cables 1 are integrated into one, which is convenient for subsequent processing of the outer end surface.

[0055] Step 116 , restoring the semiconductive layer 12 , the lead sheath 13 , the outer sheath 11 and the armor layer 25 .

[0056] It can be understood that the connection and fixation of the joints of the two sections of light submarine cable 1 are completed, and the semi-conductive layer 12, lead sheath 13, outer sheath 11 and armor layer 25 are restored in sequence, so that the light submarine cable 1 has the functions of waterproof, pressure-resistant and conductive.

[0057] The light submarine cable 1 connection method provided by the present invention removes the insulating coating layer of each single wire of the light submarine cable 1 and restores the twisted structure of the conductor 17, so that when two sections of the light submarine cable 1 are connected, the insulating coating layer of the conductor 17 is removed in layers. When the conductors 17 of the two sections of the light submarine cable 1 are connected, the electrical and mechanical properties of the connection point can be ensured, and failures caused by poor contact or insufficient insulation are prevented, thereby ensuring the compatibility and matching of the light submarine cable 1 connection, thereby ensuring the stability and reliability of the connection of the light submarine cable 1. At the same time, when the surface of the insulating layer 15 of the connecting end of the light submarine cable 1 is polished, auxiliary cooling is performed at the same time, so that the polypropylene material of the light submarine cable 1 is prevented from softening and adhering during the polishing process, thereby ensuring the consistency of the appearance of the insulating layer 15 and the stability of the insulation performance.

[0058] In some embodiments, Figure 2 and Fig.11 As shown, the steps of removing the insulating coating layer of each monofilament in the light submarine cable 1 in layers and restoring the twisted structure of the conductor 17 in this embodiment include: Step 211 , removing the insulation layer 15 at the connection ends of the two light submarine cables 1 .

[0059] Step 212, separate the twisted monofilaments of the conductor 17, and remove the water blocking tape 16 on the outside of each monofilament.

[0060] Step 213, grinding each monofilament to remove the insulating coating layer.

[0061] Step 214, restore each monofilament to its previous twisting direction.

[0062] It is understood that the insulation layer 15 of the connection end of the two light submarine cables 1 is stripped, and the stripping size A is equal to half the length of the middle joint 3 plus 3mm. Since the light submarine cable 1 is twisted by multiple monofilaments, each monofilament must be untied and restored to a straight state, and the semi-conductive water hose 16 wrapped around the monofilament must be removed. Then, the insulating coating on the surface of each monofilament is polished and removed with 400# sandpaper, and the monofilament is cleaned with a cleaning towel. Then, each monofilament with the insulating coating layer removed is restored to the original twisting direction, and can be fastened and fixed with copper wire or stainless steel hose clamps.

[0063] In this embodiment, the twisted single wires are separated, the insulating coating layer is removed, and then the structure of the conductor 17 is restored, so that when the conductors 17 are connected, the conductivity between the conductors 17 is ensured, and the conductive effect is not affected by the presence of the insulating coating layer, thereby ensuring the safety of the conductor 17.

[0064] In some embodiments, Figure 3 and Fig.11As shown, the step of removing the insulating coating layer of each monofilament in the light submarine cable 1 in layers and restoring the twisted structure of the conductor 17 in this embodiment also includes: Step 311, insert the main body 31 of the middle joint 3 and several heat shrink tubes 32 into the inner and outer sheaths 11 of the two light submarine cables 1, removing the longer one, and insert several heat shrink tubes 32 into the inner and outer sheaths 11 of the two light submarine cables 1, removing the shorter one.

[0065] It is understandable that the main body 31 of the middle joint 3 and the two 610 mm heat shrink tubes 32 and the two 1220 mm heat shrink tubes 32 are inserted into the ends of the two light submarine cables 1 with 500 mm removed from the inner and outer sheaths 11, and the two 610 mm heat shrink tubes 32 are inserted into the ends of the two light submarine cables 1 with 350 mm removed from the inner and outer sheaths 11.

[0066] Furthermore, since a support bar 33 is placed on the inner side of the main body 31 of the intermediate joint 3 during the installation process, the support bar 33 can provide mechanical support so that the main body 31 of the intermediate joint 3 can be sleeved on the light submarine cable 1. When installing the main body 31 of the intermediate joint 3, it is necessary to ensure that the pulling direction of the support bar 33 is in the direction of removing the longer end of the outer sheath 11 of the light submarine cable 1, so as to facilitate the removal of the support bar 33 later.

[0067] In this embodiment, the main body 31 and the heat shrink tube 32 of the intermediate joint 3 are pre-installed, so that after the connecting pipe 2 is installed, the main body 31 and the heat shrink tube 32 of the intermediate joint 3 can be installed conveniently.

[0068] In some embodiments, Figure 4 and Fig.12 As shown, the steps of using the connecting tube 2 to crimp the conductor 17 at the connecting end of the light submarine cable 1 in this embodiment include: Step 411, insert the connecting tube 2 into the outside of the conductor 17 at the connecting end of the light submarine cable 1, and crimp it.

[0069] Step 412, grinding and cleaning the crimped tube.

[0070] It is understandable that since the insulating layer 15 of the connecting end of the light submarine cable 1 has been stripped off, the exposed conductor 17 has had the insulating coating layer removed, the connecting tube 2 is inserted into the outside of the conductor 17 at the connecting end of the light submarine cable 1, and a pressing die matching the outer diameter of the connecting tube 2 is selected to crimp the connecting tube 2, remove the burrs on the crimped connecting tube 2, polish it flat with sandpaper and clean it, and chamfer the port of the connecting tube 2, the chamfer size is 3X45°, and it is polished smooth.

[0071] In this embodiment, the conductor 17 at the connection end of the light submarine cable 1 is crimped, so that the connection of the connection end of the light submarine cable 1 is more stable.

[0072] In some embodiments, Figure 5 and Fig.13 As shown, the steps of surface treating the connecting tube 2 and the insulating layer 15 in this embodiment include: Step 511 , winding the semi-conductive tape 18 on the outer side of the connecting tube 2 , so that the outer diameter of the winding of the semi-conductive tape 18 is flush with the outer diameter of the insulating layer 15 .

[0073] Step 512, clean the insulating layer 15 of the connecting end of the light submarine cable 1 and apply lubricant.

[0074] It is understandable that the semi-conductive tape 18 is stretched to 200% of its original length and wound around the connecting tube 2 so that the outer diameter of the winding is flush with the outer diameter of the insulating layer 15 of the light submarine cable 1, and the winding length is the length of the insulating layer 15 of the connecting end of the light submarine cable 1 that is stripped.

[0075] Treat the insulating layer 15 and clean it with a cable cleaning towel to ensure that no metal powder and conductive material remain. After the detergent on the cable cleaning towel is fully evaporated, evenly apply a small amount of lubricant.

[0076] Specifically, the lubricant may be silicone grease.

[0077] In this embodiment, the surface of the connecting pipe 2 is processed and the connecting end of the light submarine cable 1 is ensured to be flush, so that when the main body 31 of the intermediate joint 3 is subsequently installed, the internal support bar 33 can be contracted on a smooth surface, thereby laying a good foundation for the installation of the main body 31 of the intermediate joint 3.

[0078] In some embodiments, Figure 6 , Fig.12 , Fig.13 and Fig.14 As shown, the steps of installing the main body 31 of the intermediate joint 3 in this embodiment include: Step 611 , marking the center position of the connecting pipe 2 , and marking the installation reference position and the check position of the main body 31 of the intermediate joint 3 .

[0079] Step 612, remove the longer one of the two light submarine cables 1 from the outer and inner sheaths 11 of the main body 31 of the intermediate joint 3 and move it to the installation reference position.

[0080] Step 613 , based on the check position and the center position, the support bar 33 in the main body 31 of the intermediate joint 3 is pulled out to reset the main body 31 of the intermediate joint 3 .

[0081] It can be understood that the midpoints of ports a and b where the insulation layer 15 of the connection end of the light submarine cable 1 is stripped are found, a center line mark is made in the middle of the connecting tube 2, and then the shorter end of the outer sheath 11 of the connection end of the light submarine cable 1 is stripped to measure h1 as the installation reference position, and h2 is measured as the verification position.

[0082] Specifically, the length of h1 can be 205 mm, and the length of h2 can be 300 mm.

[0083] The main body 31 of the intermediate joint 3 is removed from the longer one of the outer sheaths 11 of the two light submarine cables 1 and moved to the installation reference position. Then, the main body 31 of the intermediate joint 3 is rotated, and several circles of the support strips 33 are pulled out. The main body 31 of the intermediate joint 3 is contracted. When the main body 31 of the intermediate joint 3 is contracted to half, the support strips 33 are stopped from being pulled out. The distance between the main body 31 of the intermediate joint 3 and the inspection position is measured to check the size. If there is a deviation, the position of the main body 31 of the intermediate joint 3 is fine-tuned to make the main body 31 of the intermediate joint 3 in the correct position. Then, the light submarine cable 1 is kept in a straight shape, all the support strips 33 are pulled out, the main body 31 of the intermediate joint 3 is reset, and the dirt and lubricant on the semi-conductive layer 12 at both ends of the main body 31 of the intermediate joint 3 are cleaned.

[0084] This embodiment sets the installation reference position and the check position when installing the main body 31 of the intermediate joint 3, so that the center of the main body 31 of the intermediate joint 3 is aligned with the center of the connecting pipe 2, so that the main body 31 of the intermediate joint 3 can adjust the installation deviation, thereby ensuring the accuracy of the installation position of the main body 31 of the intermediate joint 3.

[0085] In some embodiments, Figure 7 As shown, the steps of restoring the semiconductive layer 12, the lead sheath 13, the outer sheath 11 and the armor layer 25 of this embodiment include: Step 711 , using waterproof putty 19 to form a first inner water-blocking layer at both ends of the main body 31 of the middle joint 3 .

[0086] Step 712 , using the semi-conductive self-adhesive tape 20 to form a conductive layer at the connection between the two ends of the main body 31 of the intermediate joint 3 and the lead sheath 13 .

[0087] Step 713 , winding the copper shielding mesh 21 between the two lead sheaths 13 on both sides of the main body 31 of the middle joint 3 , and fixing the copper braided wire 22 and the copper shielding mesh 21 on the two lead sheaths 13 .

[0088] Step 714 , using waterproof glue 19 to form a second inner water-blocking layer at both ends of the main body 31 of the middle joint 3 .

[0089] Step 715: Use the waterproof insulating tape 24 to overlap the outer sheath 11 to form a third inner water-blocking layer.

[0090] Step 716 , wrap the armor layer 25 around the middle joint 3 .

[0091] It is understandable that after the conductor 17 of the connection end of the light submarine cable 1 is crimped and the body 31 of the intermediate joint 3 is fitted, the semiconductive layer 12, the lead sheath 13, the outer sheath 11 and the armor layer 25 are restored.

[0092] First, the semiconducting layer 12 is restored, such as Fig.15 As shown, waterproof cement 19 is used to wrap 30mm sealing waterproof slopes at both ends of the main body 31 of the middle joint 3 to form a reliable first internal water-blocking layer. Fig.16 As shown, the semi-conductive self-adhesive tape 20 stretched to 200% of its original length is wrapped around the main body 31 of the middle joint 3 in a semi-overlapping manner, overlapping the lead sheaths 13 at both ends by 30 mm respectively, to form a reliable conductive layer.

[0093] Next, the lead sheath 13 is restored, as Fig.17 As shown, starting from the lead sheath 13 on one side, the copper shielding mesh 21 is wrapped around the lead sheath 13 on the other side in a half-overlapping manner, and the copper shielding mesh 21 is wrapped tightly against the outer surface of the main body 31 of the middle joint 3, and overlapped with the lead sheath 13 at both ends by more than 30mm. The copper shielding mesh 21 and the two tinned copper braided wires 22 are fixed to the lead sheath 13 with four constant force springs 23, and the ends of the constant force springs 23 and the copper shielding mesh 21 are covered with PVC tape.

[0094] Then, the outer sheath 11 is restored, as Fig.18 As shown, waterproof glue 19 is wrapped around the outer sheath 11 half-folded with two layers, and overlapped with the outer sheath 11 and the lead sheath 13 by 20mm respectively to form a second inner water-resistant layer, as shown in FIG. Fig.19 As shown, a waterproof insulating tape stretched to 200% of its original length is wrapped in a half-lap manner for 3 to 4 layers, overlapping the outer sheath 11 by 100 mm to form a third inner water-resistant layer.

[0095] Then, if Fig.21 As shown, the armor layer 25 is installed, and the soaked material is wrapped around the main body 31 of the middle joint 3 in a semi-overlapping manner, overlapping the outer sheaths 11 at both ends by at least 50 mm.

[0096] In some embodiments, Figure 8 As shown, the steps of restoring the semiconductive layer 12 , the lead sheath 13 , the outer sheath 11 and the armor layer 25 of this embodiment further include: installing a heat shrink tube 32 .

[0097] The steps of installing the heat shrink tube 32 include: step 811, winding two layers of waterproof glue 19 on the end and overlapping part of the heat shrink tube 32.

[0098] Step 812, take a heat shrink tube 32 at each end of the main body 31 of the middle joint 3, move it to the target position, and heat it to shrink the two heat shrink tubes 32.

[0099] Step 813, move the third heat shrink tube 32 to the target position, and heat the third heat shrink tube 32 to shrink it.

[0100] It is understandable that between the steps of restoring the outer sheath 11 and the armor layer 25, it is necessary to install a heat shrink tube 32, which is usually made of plastic tubing and shrinks when heated, fitting tightly to the surface of the wrapped object to provide insulation protection, mechanical protection, and waterproof and flame retardant effects.

[0101] like Fig. 20 As shown, before installation, two layers of waterproof putty 19 are wrapped around the end and overlapping position of the heat shrink tube 32. When installing the heat shrink tube 32, first take a 610mm heat shrink tube 32 from each end and move it to a suitable position, heat and shrink it; then move a 1220mm heat shrink tube 32 to a suitable position, heat and shrink it; the overlap between the two heat shrink tubes 32 is ≥100mm.

[0102] like Fig.12 As shown, after the first layer of heat shrinkable tube 32 shrinks, two layers of waterproof adhesive 19 are firstly wrapped around the end and the overlap position of the first layer of heat shrinkable tube 32, and then the second layer of heat shrinkable tube 32 is installed, and the overlap between the second layer of heat shrinkable tube 32 and the PE sheath of the submarine cable is ≥100mm. After the heat shrinkable tube 32 is installed, a layer of waterproof insulation tape 24 and PVC tape are wrapped around the end of the heat shrinkable tube 32.

[0103] In some embodiments, Fig. 9 As shown, the method for connecting the light submarine cable 1 of this embodiment further includes: pre-processing the light submarine cable 1.

[0104] The step of pre-processing the light submarine cable 1 comprises: Step 911, straightening the light submarine cable 1.

[0105] Step 912, removing the outer coating of the connecting end of the light submarine cable 1.

[0106] Step 913, retain 100 mm of the armor layer 25, the inner lining sheath and the bag on the outer sheath of the light submarine cable 1, and remove the remaining armor layer 25, the inner lining sheath and the bag.

[0107] Step 914, separating the three-phase submarine cable and the optical fiber unit to obtain a single-phase submarine cable.

[0108] It is understandable that, before processing the light submarine cable 1, pre-processing is required. The size of the pre-processing of the light submarine cable 1 is determined by the length of the intermediate joint 3, including straightening the light submarine cable 1 and stripping the plastic outer sheath at the connection end of the light submarine cable 1 according to the length of the intermediate joint 3. The steel wire armor layer from the end of the plastic outer sheath of the connection end of the light submarine cable 1 to 100 mm is retained, and the remaining steel wire armor layer is stripped, and the end of the light submarine cable 1 is polished and rounded with a file, and then the lining sheath and bag at the connection end of the light submarine cable 1 are retained, and the remaining lining sheath and bag are removed.

[0109] Then remove the filler of the three-phase submarine cable, wrap the tape layer with PVC tape, and separate the three-phase submarine cable and the optical fiber unit to obtain a single-phase submarine cable for submarine cable splicing.

[0110] In some embodiments, Fig.13 As shown, in this embodiment, a cable cleaning towel or anhydrous ethanol is used to assist in cooling the surface of the insulating layer 15 .

[0111] It is understandable that the cable cleaning towel is a special cleaning tool that will not scratch the surface of the submarine cable, and anhydrous ethanol is a strong solvent that evaporates quickly and leaves no residue. Both the cable cleaning towel and anhydrous ethanol are conducive to the rapid cooling of the light submarine cable 1.

[0112] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A light submarine cable connection method, characterized in that: include: The outer sheath, semi-conductive layer, lead sheath and insulating shielding layer of the light submarine cable are removed in sequence according to the preset length, and the surface of the insulating layer at the connecting end of the two light submarine cables is polished and auxiliary cooling is performed at the same time; Remove the insulating coating layer of each single wire in the lightweight submarine cable in layers and restore the stranding structure of the conductor; Use the connecting tube to crimp the conductor at the connecting end of the light submarine cable; Carry out surface treatment on the connecting pipe and the insulation layer; Install the main body of the intermediate joint; Restore the semi-conductive layer, lead sheath, outer sheath and armor layer.

2. The light submarine cable connection method according to claim 1, characterized in that: The step of removing the insulating coating layer of each monofilament in the light submarine cable in layers and restoring the twisted structure of the conductor comprises: Remove the insulation layer from the two light submarine cable connection ends; Separate the twisted single wires of the conductor and remove the water blocking tape on the outside of each single wire; Each monofilament is sanded to remove the insulating coating; Re-twist each monofilament in the same direction as before.

3. The light submarine cable connection method according to claim 2, characterized in that: The step of removing the insulating coating layer of each monofilament in the light submarine cable in layers and restoring the twisted structure of the conductor also includes: Put the main body of the middle joint and several heat shrink tubes into the outer sheaths of two light submarine cables and remove the longer one; put several heat shrink tubes into the outer sheaths of two light submarine cables and remove the shorter one.

4. The light submarine cable connection method according to claim 1, characterized in that: The step of using the connecting tube to crimp the conductor at the connecting end of the light submarine cable comprises: Slip the connecting tube onto the outside of the conductor at the connecting end of the light submarine cable and crimp it; Grind and clean the crimped tube after crimping.

5. The light submarine cable connection method according to claim 1, characterized in that: The steps of surface treating the connecting pipe and the insulating layer include: Winding a semi-conductive tape on the outside of the connecting tube so that the outer diameter of the semi-conductive tape is flush with the outer diameter of the insulating layer; Clean the insulation layer of the light submarine cable connection end and apply lubricant.

6. The light submarine cable connection method according to claim 3, characterized in that: The step of installing the main body of the intermediate joint includes: Mark the center position of the connecting pipe, and mark the installation reference position and check position of the main body of the intermediate joint; Remove the longer outer sheath of the two light submarine cables and move the main body of the intermediate joint to the installation reference position; Based on the check position and the center position, the support bar in the main body of the middle joint is pulled out to reset the main body of the middle joint.

7. The light submarine cable connection method according to claim 1, characterized in that: The steps of restoring the semi-conductive layer, the lead sheath, the outer sheath and the armor layer include: Using waterproof mastic to form a first inner water-blocking layer at both ends of the main body of the middle joint; A semi-conductive self-adhesive tape is used to form a conductive layer at the connection between the two ends of the body of the intermediate joint and the lead sheath; A copper shielding mesh is wound between two lead sheaths on both sides of the main body of the middle joint, and the copper braided wire and the copper shielding mesh are fixed on the two lead sheaths; Using waterproof mastic to form a second inner water-blocking layer at both ends of the main body of the middle joint; Use waterproof insulating tape to overlap the outer sheath to form a third inner water-blocking layer; Wrap the armor layer around the middle joint.

8. The light submarine cable connection method according to claim 7, characterized in that: The step of restoring the semi-conductive layer, the lead sheath, the outer sheath and the armor layer also includes: installing a heat shrink tubing; The step of installing the heat shrink tube includes: wrapping two layers of waterproof glue around the end and overlapped portion of the heat shrink tube; Take a heat shrink tube at each end of the main body of the middle joint and move it to the target position, and heat it to shrink the two heat shrink tubes; Then move the third heat shrink tube to the target position and heat it to shrink it.

9. The light submarine cable connection method according to claim 1, characterized in that: Also includes: Pre-processing of lightweight submarine cables; The step of pre-processing the light submarine cable comprises: Straightening of light submarine cables; Remove the outer layer of the light submarine cable connection end; Keep the 100mm armor layer, inner lining sheath and bag on the outer sheath of the light submarine cable, and remove the remaining armor layer, inner lining sheath and bag; The three-phase submarine cable and the optical fiber unit are separated to obtain a single-phase submarine cable.

10. The light submarine cable connection method according to claim 1, characterized in that: Use cable cleaning towel or anhydrous ethanol to assist in cooling the surface of the insulation layer.

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