CN112363285A - Miniaturized optical cable for pipeline and construction method thereof - Google Patents

Abstract

The invention belongs to the technical field of communication optical cables, and particularly relates to a miniaturized optical cable for a pipeline and a construction method thereof. The optical cable comprises a metal reinforcing piece, a plurality of optical units twisted on the outer surface of the metal reinforcing piece, and a plurality of sheaths longitudinally wrapped on the outer surface of the optical units, wherein the metal reinforcing piece is a phosphatized steel wire, the optical units comprise loose tubes, optical fibers arranged in the loose tubes and fiber paste filled between the loose tubes and the optical fibers, and the outer diameter of the loose tubes is smaller than or equal to 1.4 mm. The optical cable structure provided by the invention adopts the micro loose tube combined with the phosphated steel wire, so that the tensile strength of the optical cable is improved while the outer diameter of the optical cable is reduced, and the optical cable can be laid in a pipeline through a textile sub-tube construction process.

Description

Miniaturized optical cable for pipeline and construction method thereof

Technical Field

The invention belongs to the technical field of communication optical cables, and particularly relates to a miniaturized optical cable for a pipeline and a construction method thereof.

Background

With the arrival of the 5G era, application requirements are diversified, and higher requirements on network performance are put forward by service traffic explosion. The application scenario of 5G covers enhanced mobile broadband, large-scale machine communication and high-reliability low-delay communication, and compared with 4G, the broadband requirement is improved by 100 times, and the delay requirement is reduced by 10 times. Limited by limited spectrum resources, can only meet the requirements of service standards through architectural adjustment. From system architecture adjustment measurements, the 5G demand for fiber optic cables will increase on a large scale.

In recent years, as large-scale transmission projects such as 3G and 4G, FTTH are built, the existing pipeline resources of operators are increasingly strained. Besides large pipes with an inner diameter of about 100mm, small-diameter pipes with an inner diameter of 26-40 mm account for a considerable proportion of the pipeline resources of operators, such as PE sub-pipes, plum blossom pipes, honeycomb pipes, grid pipes, silicon core pipes and the like.

The traditional optical cable has large outer diameter and low utilization rate of pipeline resources, and the other air-blowing micro-cable technology can save the pipeline resources, but has high requirements on construction technology, has small distance between domestic manholes and is rarely applied to the technology. How to reasonably and efficiently use the pipeline resources to meet the huge demand of optical fiber deployment will become a main subject of 5G era operators.

Disclosure of Invention

The invention aims to provide a miniaturized optical cable for a pipeline and a construction method thereof, wherein the optical cable structure adopts a loose tube with the outer diameter of less than 1.4mm, and the micro loose tube is combined with a phosphatized steel wire, so that the outer diameter of the optical cable is reduced, the tensile strength of the optical cable is improved, and the optical cable can be laid in the pipeline through a spinning sub-tube construction process.

In order to achieve the purpose, the invention provides the following technical scheme:

the invention provides a miniaturized optical cable for a pipeline, which comprises a metal reinforcing piece, a plurality of optical units and a sheath, wherein the optical units are twisted on the outer surface of the metal reinforcing piece, the sheath is longitudinally wrapped on the outer surface of the optical units, the metal reinforcing piece is a phosphatized steel wire, the optical units comprise a loose tube, optical fibers arranged in the loose tube and fiber paste filled between the loose tube and the optical fibers, and the outer diameter of the loose tube is smaller than or equal to 1.4 mm.

Furthermore, a cushion layer is coated outside the metal reinforcing piece.

Furthermore, a water blocking yarn is arranged in a gap between the metal reinforcing piece and the loose tube in a tangent mode.

Further, a tearing rope is arranged on the interface where the loose tube and the sheath are connected.

Further, the material of the loose tube comprises PBT or PP.

Further, the twisting mode of the light unit and the metal reinforcing piece is SZ twisting.

Further, the material of the sheath comprises PE or nylon.

Furthermore, a filling rope is arranged between the light units.

The invention also provides a preparation method of the miniaturized optical cable for the pipeline, which comprises the following steps: optical fiber warehousing, optical fiber coloring, secondary plastic coating, cabling, sheath and optical cable delivery, wherein quality inspection steps are also arranged among the steps.

The invention also provides a construction method of the miniaturized optical cable for the pipeline, which comprises the following steps:

step 1: laying by using a textile sub-pipe, firstly, drawing the single-belt or multi-belt textile sub-pipe into a pipeline through a pipe penetrating device;

step 2: after the textile sub-pipe is put in, cutting off all pipe belts and leaving the length of about 1 meter outside the pipeline, ensuring that all pull ropes can be seen in the pipe hole and fixing the two ends of the textile sub-pipe in manhole shafts at the two ends respectively;

and step 3: the optical cable is connected with the universal joint and the pull rope in the textile sub-pipe after being fixed by the cloth net sleeve, and is wound and leveled by the adhesive tape;

and 4, step 4: the order of putting the optical cable into the 3-hole textile sub-tube is as follows: firstly, a middle hole is penetrated, then a bottom hole is penetrated, and finally an upper hole is penetrated;

and 5: the optical cable is pulled by pulling the pull rope in the textile sub-pipe, so that the miniaturized optical cable quickly passes through the pipeline to finish the pipeline laying.

The invention has the beneficial effects that:

1. according to the invention, the loose sleeve with the outer diameter of less than 1.4mm is adopted, so that the outer diameter of the cable core can be reduced after the loose sleeve is cabled, and compared with the outer diameter of a common optical cable GYTY, the outer diameter is reduced by about 50%;

2. the invention adopts the phosphatized steel wire as the metal reinforcement, so that the optical cable can meet the standard drawing force during traction;

3. the optical cable is of a semi-dry structure, the miniature loose tube and the metal reinforcing piece are subjected to an SZ twisting process, a cable core with a stable structure is formed through accurate yarn binding tension control, and a PE (polyethylene) or nylon material layer is protected outside the cable core after units such as tearing ropes are added outside the cable core to form the optical cable;

4. according to the invention, through mechanical property and environmental performance tests, the performance of the optical cable meets the industrial standard YDT 3349.3-2018, namely the 3 rd part of the light optical cable for the access network: layer-stranding;

5. the miniaturized optical cable can greatly improve the utilization rate of pipeline resources by matching with the textile sub-pipe and the construction process thereof during construction.

The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood and to implement them in accordance with the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings.

Drawings

Fig. 1 is a schematic structural view of an optical cable.

Fig. 2 is a flowchart of a method for manufacturing a miniaturized optical cable for a duct.

Fig. 3 is a schematic diagram of the cable run in the conduit.

Fig. 4 is a schematic view of a construction method of a miniaturized optical cable for a duct.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

Referring to fig. 1, the present embodiment provides a miniaturized optical cable for a pipeline, including a metal reinforcement 1, a plurality of optical units 2 twisted on an outer surface of the metal reinforcement 1, and a sheath 3 longitudinally wrapped on an outer surface of the optical units 2, where the material of the sheath 3 is PE or nylon, and a minimum thickness of a wall thickness of the sheath 3 is greater than or equal to 1 mm. The twisting mode of the optical unit 2 and the metal reinforcement 1 is SZ twisting, that is, twisting is performed first for a section in the forward direction, and then for a section in the reverse direction.

The metal reinforcement 1 is a phosphatized steel wire. In other embodiments, the metal reinforcement 1 is further covered with a cushion layer 4, and the cushion layer 4 is made of water-blocking aramid fiber.

The light unit 2 includes a loose tube 21, an optical fiber 22 disposed inside the loose tube 21, and a fiber paste 23 filled between the loose tube 21 and the optical fiber 22. The outer diameter of the loose tube 21 is less than or equal to 1.4mm, the loose tube 21 is made of PBT or PP, and each loose tube 21 comprises a plurality of optical fibers 22. A filling rope is arranged between the light units 2, the diameter of the filling rope is the same as that of the loose tube 21, and the filling rope is used for supplementing the light units 2 when the number of the light units 2 is small.

The loose tube sleeve adopted in the embodiment reduces the surface roughness of the mold by improving the existing extrusion mold, uniformly controls the extrusion molding amount of the material of the loose tube 21, adds the water-blocking composite fiber paste 23 while sending the optical fiber 22 into the loose tube 21, and simultaneously controls the excess length of the optical fiber 22 in the loose tube 21 by adopting a proper process, so that the material of the loose tube 21 and the fiber paste 23 have good compatibility.

And a water blocking yarn 5 is arranged in a gap between the metal reinforcing part 1 and the loose tube 21, and the water blocking yarn 5 can ensure the water blocking performance of the whole section of the optical cable. The interface of the loose tube 21 and the sheath 3 is provided with a tearing rope 6, and the tearing rope 6 is used for facilitating the tearing of the sheath 3 for welding the joint of the optical fiber 22.

The loose tube 21 with the outer diameter of less than 1.4mm is adopted in the optical cable structure, so that the outer diameter of a cable core can be reduced after the loose tube 21 is cabled, and compared with the common optical cable GYTY, the outer diameter is reduced by about 50%; by adopting the phosphated steel wire as the metal reinforcement 1, the optical cable can meet the standard drawing force during traction; the whole optical cable structure adopts the semi-dry structure, and the miniature loose tube 21 and the metal reinforcement 1 are subjected to SZ stranding process and form a cable core with stable structure through accurate yarn binding tension control.

Example 2

The present embodiment provides a method for manufacturing the miniaturized optical cable for a duct in embodiment 1, including the following steps: optical fiber warehousing, optical fiber coloring, secondary plastic coating, cabling, sheath and optical cable delivery, wherein quality inspection steps are further arranged among the steps, and the specific steps are shown in the sequence of fig. 2.

Example 3

Referring to fig. 3 and 4, the construction method of the miniaturized optical cable for a pipeline in embodiment 1 includes the following steps:

step 1: laying by using the textile sub-pipe 7, firstly, drawing the single-belt or multi-belt textile sub-pipe 7 into a pipeline 8 through a pipe penetrating device;

step 2: after the textile sub-pipe 7 is put in, cutting off all pipe belts and leaving the length of about 1 meter outside the pipeline 8, ensuring that all pull ropes 10 can be seen in the pipe hole and fixing the two ends of the textile sub-pipe 7 in manhole shafts 11 at the two ends respectively;

and step 3: the optical cable 9 is connected with the universal joint and a pull rope 10 in the textile sub-tube 7 after being fixed by the cloth net sleeve, and is wound and leveled by an adhesive tape;

and 4, step 4: the order of putting the optical cable 9 through the 3-hole textile sub-tube 7 is as follows: firstly, a middle hole is penetrated, then a bottom hole is penetrated, and finally an upper hole is penetrated;

and 5: the optical cable 9 is pulled by manually pulling the pull rope 10 in the textile sub-tube 7 by using a wooden stick or a handle frame, so that the miniaturized optical cable 9 quickly passes through the pipeline 8, and the laying of the pipeline 8 is completed.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (10)

1. The utility model provides a miniaturized optical cable is used to pipeline, includes the metal reinforcement, strand in a plurality of optical unit of metal reinforcement surface, indulge the package in a plurality of the sheath of optical unit surface, the metal reinforcement is the phosphating steel wire, optical unit includes loose tube, sets up in the intraductal optic fibre of loose tube and fill in loose tube with the fine cream between the optic fibre, the external diameter of loose tube is less than or equal to 1.4 mm.

2. The miniaturised ducted cable according to claim 1 wherein the metal strength member is further coated with a bedding layer.

3. The miniaturised ducted optical cable according to claim 1 wherein a water blocking yarn is provided in the gap where the metal strength member is tangent to the loose tube.

4. The miniaturised cable for pipes according to claim 1 wherein the interface of the loose tube with the sheath is provided with a ripcord.

5. The miniaturised cable for pipes according to claim 1 wherein the material of the loose tube comprises PBT or PP.

6. The miniaturised optical cable for ducts of claim 1 wherein the optical unit is twisted with the metal strength member in a SZ twist.

7. The miniature fiber optic cable for ducts of claim 1, wherein a material of said sheath comprises PE or nylon.

8. The miniaturised cable for pipes according to claim 1 wherein a filling rope is provided between the light units.

9. The method for manufacturing a downsized optical cable for duct according to any of claims 1 to 8, comprising the steps of: optical fiber warehousing, optical fiber coloring, secondary plastic coating, cabling, sheath and optical cable delivery, wherein quality inspection steps are also arranged among the steps.

10. The construction method of a downsized optical cable for conduit according to any one of claims 1 to 8, comprising the steps of:

step 1: laying by using a textile sub-pipe, firstly, drawing the single-belt or multi-belt textile sub-pipe into a pipeline through a pipe penetrating device;

step 2: after the textile sub-pipe is put in, cutting off all pipe belts and leaving the length of about 1 meter outside the pipeline, ensuring that all pull ropes can be seen in the pipe hole and fixing the two ends of the textile sub-pipe in manhole shafts at the two ends respectively;

and step 3: the optical cable is connected with the universal joint and the pull rope in the textile sub-pipe after being fixed by the cloth net sleeve, and is wound and leveled by the adhesive tape;

and 4, step 4: the order of putting the optical cable into the 3-hole textile sub-tube is as follows: firstly, a middle hole is penetrated, then a bottom hole is penetrated, and finally an upper hole is penetrated;

and 5: the optical cable is pulled by pulling the pull rope in the textile sub-pipe, so that the miniaturized optical cable quickly passes through the pipeline to finish the pipeline laying.

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