CN217215932U

CN217215932U - Submarine cable tensile bending-proof joint box

Info

Publication number: CN217215932U
Application number: CN202220846437.7U
Authority: CN
Inventors: 王国忠; 黄海磊; 邱小杰
Original assignee: Jiangsu Tongguang Marine Opto Electronic Technology Co ltd
Current assignee: Jiangsu Tongguang Marine Opto Electronic Technology Co ltd
Priority date: 2022-04-13
Filing date: 2022-04-13
Publication date: 2022-08-16
Anticipated expiration: 2032-04-13

Abstract

The utility model relates to a submarine cable tensile bending-proof joint box, the joint box body (1) of which is composed of two upper half parts (5) and two lower half parts (6); the upper half part and the lower half part are both provided with bending-proof liner tubes (4); the outer surface of the anti-bending liner tube (4) is provided with a semicircular spiral groove (8); the spiral pitch of the spiral groove (8) is equal to the pitch of the armor steel wires; the semi-circle diameter of the spiral groove (8) is equal to the diameter of the armor steel wire; the number of the spiral grooves (8) is equal to the number of the armor steel wires; two semicircular clamping blocks (3) are arranged outside the anti-bending liner tube (4); the parallel distance between the inner cavity of the clamping block (3) and the bottom of the spiral groove (8) is the diameter of an armored steel wire; a locking piece (2) is arranged outside the clamping block (3); the locking piece (2) is fixedly connected with the joint box body (1). The utility model discloses need not to install crooked limiter and also can bear certain crooked and pulling force, reach and prevent that the splice box from receiving great mechanical force and damaging the effect that connects, reduced the cost of manufacture.

Description

Submarine cable tensile bending-proof joint box

Technical Field

The utility model relates to a submarine power cable technical field specifically is a submarine cable tensile prevents curved splice box.

Background

Submarine cables run on the seabed in water depth of several meters or even thousands of meters, and often break down due to self defects or damage by external excessive mechanical force, so that the submarine cables are in urgent need of maintenance. At present, the well-known submarine cable maintenance method is to salvage out the fault position of the cable horizontally, remove the fault section, continue to maintain the cable by using a connector box, and then place the connector box and the cable on the seabed. However, due to the fact that the water depth is several meters or even thousands of meters, in the process of directly putting the splice closure and the cable to the water bottom, the splice closure part is inevitably subjected to bending and stretching, so that the connection part is subjected to mechanical force to leave a fault hidden danger, and when the fault hidden danger is serious, the cable joint is immediately damaged. For avoiding directly putting the splice box to the bottom, the cable at splice position receives the effect of great mechanical force, traditional way is with a steel pipe or channel-section steel about 3 times splice box length, the cable of splice box and connection is hung to several points, slowly the level puts down the steel pipe again, thus, the splice box can keep at connecting portion position basically parallel with steel pipe or channel-section steel, put to the bottom in-process, the connection position does not basically receive the effect of pulling force and torsion, to high tension cable, even so, still need the installation crooked limiter at the cable at splice box both ends, prevent excessive bending, just can guarantee to repair the reliability of joint.

CN 110212485 a discloses a three-core high-voltage submarine cable junction box and its installation method, including an external component, at least three electrical connection components and at least one optical connection component, where the electrical connection components and the optical connection components are arranged inside the external component, and two submarine cables to be connected are inserted into the external component from two opposite ends of the external component respectively and are communicated through the electrical connection components and the optical connection components. The external assembly comprises an outer shell, two sets of bending limiters and two fixing plates, wherein the two sets of bending limiters are respectively arranged on two opposite sides of the outer shell and connected with the outer shell, and the waterproof performance and the pressure-bearing performance are high. However, the bending limiters are still mounted on both sides of the housing, which is relatively expensive to manufacture.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that a crooked limiter of cancellation is provided, puts the submarine in-process after the installation and can bear certain bending force and pulling force, does not harm the splice box at joint position.

In order to realize the technical purpose, the utility model provides a submarine cable tensile bending-proof joint box, which comprises a joint box body, a locking piece and a clamping block; the joint box body consists of two upper half parts and two lower half parts; the upper half part and the lower half part are both provided with an anti-bending liner tube; the outer surface of the anti-bending liner pipe is provided with a semicircular spiral groove; the spiral pitch of the spiral groove is equal to the pitch of the armor steel wire; the semi-circle diameter of the spiral groove is equal to the diameter of the armor steel wire; the number of the spiral grooves is equal to that of the armor steel wires; two semicircular clamping blocks are arranged outside the anti-bending liner tube; the parallel distance between the inner cavity of the clamping block and the bottom of the spiral groove is the diameter of one armored steel wire; the clamping block is sleeved with a locking piece; the locking piece is fixedly connected with the joint box body.

Further, pipe orifices are arranged on the two upper half parts.

Furthermore, the locking piece is of a circular ring structure, the inside of the locking piece is of a conical surface structure, the conical degree of the locking piece is equal to the conical degree of the outer conical surface of the clamping block, and the parallel distance between the locking piece and the clamping block is the diameter of one armored steel wire.

Furthermore, round holes are formed around the locking piece and are used for being fixedly connected with the joint box body.

Further, the two clamping blocks are connected through a fastener.

Further, the taper of the inner cavity of the clamping block is equal to the taper of the outer surface of the bending-proof liner tube.

Compared with the prior art, the utility model, following beneficial effect has:

1. the utility model discloses splice box and armor steel wire adopt toper clamp splice to be connected locking, ensure splice box's stretching resistance, set up in the splice box and prevent the curved bushing pipe, the surface of preventing the curved bushing pipe is opened has semicircular helicla flute, the pitch of helicla flute equals the pitch of armor steel wire, increase the armor steel wire and the contact surface of preventing the curved bushing pipe, provide the appropriate bending radius of connection position simultaneously, during construction, the armor steel wire and the helicla flute closely laminate on the pipe of preventing the curved bushing, under the effect of clamp splice and fastener, provide certain stretching resistance for the connection position, simultaneously, in the process of putting down the splice box to the seabed, because on the pipe of preventing the curved bushing pipe at connection position, the steel wire is the spiral, its pitch equals the pitch of armor steel wire, the steel wire of arranging like this, when providing the stretching resistance, make longitudinal bending convenient, provide the appropriate bending radius of allowing for the connection position, the cable core at the connecting part is not affected by bending force, and can bear certain bending and pulling force without installing a bending limiter, so that the joint box is prevented from being damaged by larger mechanical force, and the manufacturing cost is reduced.

2. The utility model discloses the retaining member is a ring structure, and inside is conical surface structure, and its tapering equals the outer conical surface tapering of clamp splice, and both parallel intervals are an armor steel wire diameter. Round holes are formed around the locking piece and are used for being connected with the joint box body through bolts. And bending the steel wire to enable the steel wire to be tightly attached to the surface of the circular truncated cone of the clamping block, and after the tail end of the steel wire is bound by the thin iron wire, installing a fastener, tightening by using a bolt and a nut, and improving the installation stability of the armored steel wire.

3. The utility model discloses parallel interval between clamp splice inner chamber and the helicla flute tank bottom is the diameter of an armor steel wire, ensures that armor steel wire and helicla flute closely laminate in the anti-bending bushing pipe, under the combined action of clamp splice and fastener, provides suitable stretching resistance for connecting the position.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic view of the fastener structure of the present invention.

Fig. 3 is a schematic view of the first half structure of the joint box body of the present invention.

Fig. 4 is a schematic view of the lower half structure of the joint box body of the present invention.

Fig. 5 is a schematic view of the structure of the bending-proof lining tube of the present invention.

Fig. 6 is a schematic view of the structure of the clamping block of the present invention.

Fig. 7 is an installation diagram of the present invention.

In the figure, 1, a joint box body, 2, a fastener, 3, a clamping block, 4, an anti-bending liner tube, 5, an upper half part, 6, a lower half part, 7, a pipe orifice, 8 and a spiral groove.

Detailed Description

As shown in fig. 1, a submarine cable tensile bending-proof splice closure comprises a splice closure body 1, a locking member 2, a clamping block 3 and a bending-proof lining tube 4. The clamping block 3 is externally sleeved with a locking piece 2. Retaining member 2 is a ring structure, and inside is conical surface structure, and the tapering of 2 conical surfaces in the retaining member equals the outer conical surface tapering of 3 round platforms of clamp splice. The parallel distance between the clamping block 3 and the locking part 2 is the diameter of one armored steel wire.

As shown in fig. 2, round holes are formed around the locking member 2 for fixing with bolt holes of the joint box body 1 by bolts and nuts. The four parts of the joint box body 1 are assembled, connected and sealed, and are fastened by bolts and nuts and sealed by rubber, and after assembly, the diameter and the length of the cavity of the joint box body 1 can accommodate the repaired cable core of the joint part and the joint box (if any) of the optical unit.

As shown in fig. 3 and 4, the joint box body 1 is composed of two upper halves 5 and two lower halves 6; the two upper half parts 5 are provided with pipe orifices 7 for glue filling or air exhaust, and when one is used for glue filling, the other is used for air exhaust. The joint box body 1 is divided into four parts, so that the joint box is convenient to transport and install on site.

As shown in fig. 5, the upper half 5 and the lower half 6 are provided with the bending-proof lining tube 4. After the upper and lower anti-bending liner tubes 4 are assembled, the cylindrical cavity inside just accommodates the cable core of the cable stripped of the armored steel wires. The outer surface of the bending-proof lining pipe 4 is provided with a semicircular spiral groove 8. The semi-circle diameter of the spiral groove 8 is equal to the diameter of the cable armor steel wire. The number of the spiral grooves 8 is equal to the number of the armor steel wires. The helical pitch of the helical groove 8 is equal to the pitch of the armouring wires.

As shown in fig. 6, the exterior of the bend-resistant lining tube 4 is provided with two semicircular clamping blocks 3. The two clamping blocks 3 are fastened by bolts. The taper of the inner cavity of the clamping block 3 is equal to the taper of the outer surface of the anti-bending liner tube 4, and the parallel distance between the inner cavity of the clamping block 3 and the outer circular platform of the anti-bending liner tube 4 is the diameter of half armored steel wires; the taper of the outer circular truncated cone of the clamping blocks 3 is larger than the taper of the inner cavity, and the two clamping blocks 3 are fastened by bolts to form a hollow truncated cone.

The working principle is as follows: the armored steel wire and the joint box body 1 are connected by the conical clamping blocks 3, so that the armored steel wire and the joint box body 1 are in a locking state when being installed, and the tensile resistance of the installed joint box body 1 reaches the tensile resistance which can be borne by the armored steel wire; because the joint box body 1 is internally provided with the bending-prevention liner tube 4, the surface of the bending-prevention liner tube 4 is provided with the semicircular spiral groove 8, and the pitch of the spiral groove 8 is equal to that of the armored steel wire, so that the contact surface of the armored steel wire and the bending-prevention liner tube is large, and the proper allowable bending radius of the connection part is provided. After the joint box body 1 is connected, the joint box body 1 is rigid and cannot bend, and bending stress can be concentrated at two ends of the clamping block 3 of the locking steel wire along with construction operation at the joint of the cable and the joint, and the bending stress is dispersed due to the effect of the anti-bending liner tube 4 which is connected with the joint box body 1 into a whole. The steel wires on the anti-bending liner tube are spiral, the pitch of the steel wires is equal to that of the armor steel wires, the steel wires are arranged like a spring, tensile force is provided, longitudinal bending is facilitated, the allowable bending radius is increased when the cable at the connecting part is bent, bending stress is dispersed, and the cable core is free from force. The length of the bend-preventing liner 4 can be adjusted appropriately according to the required bending radius. Therefore, excessive protection measures are not needed like the traditional joint box body 1, a bending limiter is not needed to be installed, the manufacturing cost is reduced, and the operation is time-saving and labor-saving.

The installation method comprises the following steps: before installation, the cable and the repair cable are respectively sleeved with the locking piece 2, the necessary cable and the optical cable connection required components. And stripping the armor steel wires of the cable and the maintenance cable, repairing the conductor and the conductor shielding, insulation and insulation shielding of the cable, connecting and sealing the metal shielding, and then installing the four parts of the joint box body 1. The length of an armored steel wire at the end of a cable is reserved to be about 2.5 times of the length of a bending-resistant liner tube 4, redundant armored steel wires are cut off, the remaining armored steel wires are uniformly distributed on the surface of the bending-resistant liner tube 4 and enter a spiral groove 8, two clamping blocks 3 are installed, the steel wires are bent to be tightly attached to the surfaces of circular truncated cones of the clamping blocks 3, and after the tail ends of the steel wires are bundled by thin iron wires, fasteners 2 are installed and tightened by bolts and nuts, as shown in figure 7. And finally, pouring high-voltage insulating waterproof sealant, and covering the two pipe orifices. Standing, and after the high-voltage insulating waterproof sealant is cured, putting the joint part into the water bottom.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and replacements can be made without departing from the technical principle of the present invention, and these modifications and replacements should also be regarded as the protection scope of the present invention.

Claims

1. A submarine cable tensile bending-resistant joint box comprises a joint box body (1), a locking part (2) and a clamping block (3); the method is characterized in that: the joint box body (1) consists of two upper half parts (5) and two lower half parts (6); the upper half part (5) and the lower half part (6) are both provided with an anti-bending liner tube (4); the outer surface of the anti-bending liner tube (4) is provided with a semicircular spiral groove (8); the spiral pitch of the spiral groove (8) is equal to the pitch of the armor steel wires; the semi-circle diameter of the spiral groove (8) is equal to the diameter of the armor steel wire; the number of the spiral grooves (8) is equal to that of the armor steel wires; two semicircular clamping blocks (3) are arranged outside the anti-bending liner tube (4); the parallel distance between the inner cavity of the clamping block (3) and the bottom of the spiral groove (8) is the diameter of one armored steel wire; a locking piece (2) is sleeved outside the clamping block (3); the locking piece (2) is fixedly connected with the joint box body (1).

2. A submarine cable tension bend resistant closure according to claim 1, wherein: and pipe orifices (7) are arranged on the two upper half parts (5).

3. A submarine cable tension bend resistant closure according to claim 1, wherein: the locking piece (2) is of a circular ring structure, the inside of the locking piece is of a conical surface structure, the conical degree of the locking piece is equal to the conical degree of the outer conical surface of the clamping block (3), and the parallel distance between the locking piece and the clamping block is the diameter of an armored steel wire.

4. A submarine cable tension bend resistant closure according to claim 1, wherein: round holes are formed around the locking piece (2).

5. A submarine cable tension bend resistant closure according to claim 1, wherein: the two clamping blocks (3) are connected through a fastener.

6. A submarine cable tension bend resistant closure according to claim 1, wherein: the taper of the inner cavity of the clamping block (3) is equal to the taper of the outer surface of the anti-bending liner tube (4).