CN1862302A

CN1862302A - Buried full medium optical cable

Info

Publication number: CN1862302A
Application number: CN 200610051952
Authority: CN
Inventors: 张万春; 祝冬军; 薄崇飞; 方伟栋
Original assignee: ZHEJIANG FUCHUNJIANG COMMUNICATION GROUP CO Ltd
Current assignee: ZHEJIANG FUCHUNJIANG PHOTO-ELECTRONIC SCIENCE & TECHNOLOGY Co.,Ltd.
Priority date: 2006-06-14
Filing date: 2006-06-14
Publication date: 2006-11-15
Anticipated expiration: 2026-06-14
Also published as: CN100420971C

Abstract

The present invention relates to a plow-in al-medium optical cable. It is characterized by that the optical cable centre reinforcement adopts non-metal glass fibre reinforced plastic round pipe, the optical fibre in the bundle pipe is longer than bundle pipe, the bundle pipe in cable core adopts SZ twisted mode, the exterior of cable core is covered with polyethylene inner jacket whose thickness is 1.0-1.2mm, then covered with non-metal glass fibre yarn, and finally covered with polyethylene outer jacket whose thickness is 2.0 mm.

Description

A kind of buried full medium optical cable

Technical field:

The present invention relates to a kind of communications optical cable, especially relate to the invention of employed optical fiber cable for direct burials such as being applicable to highfield, anti-strong electromagnetic, national defense communication circuit.

Background technology

Be used for highfield, signal shielding requirement height, the employed optical cable direct-burying of national defense communication circuit and be laid in undergroundly, so optical cable itself should have high-tensile, lateral pressure resistant, not be subjected to characteristics such as electromagnetic interference (EMI).To being used for the employed ordinary optical cable of direct-burried line traffic, requiring has multinomial performances such as advantages of higher tensile strength, lateral pressure resistant, but is not suitable for the environment that requires direct-burried of highfield.The non-metallic optical fiber cables of prior art is deposited stretch-proof, lateral pressure resistant poor performance (not reaching the requirement of optical fiber cable for direct burial), is difficult to satisfy the mechanical property requirement of direct-burried.

Summary of the invention

The invention provides a kind of anti-interference, the big tensile strength of direct-burried use, non-metallic optical fiber cables of lateral pressure resistant of being used for.

The present invention is achieved by the following technical solution: nonmetallic glass fiber reinforced plastics round bar is strengthened adopting in the optical cable center, and the optical fiber in the beam tube is longer than beam tube, and surplus length is 0.6-1.0%; It is stranded that beam tube adopts SZ in the cable core, and twisting pitch/stranding angle is 60-70mm/10 π; It is 1.0-1.2mm tygon inner sheath that cable core coats thickness outward; The wrapped more nonmetal anti-element glass fiber yarn of opening, extruding thickness then is the tygon oversheath of 2.0mm.

As preferably, the vertical outward bag nonwoven fabrics of cable core, its thickness is 0.1-0.15mm, is preferably 0.15mm; Inner sheath thickness 1.0-1.2mm is preferably 1.2mm; Glass fiber yarn has twisting and does not twist, and is preferably the twisting glass fiber yarn; The glass fiber yarn lay of lapping is 600-800mm, is preferably 800mm.

Because optical fiber excess length, cable core pitch and band design, glass fiber yarn lay of lapping and the control of sheath expressing technique are rationally, make optical cable stable when the high electromagnetic interference (EMI) of circuit, large lateral pressure power, big pulling strengrth, high temperature and low temperature, every performance satisfies communication industry standard YD/T901-2001 about the requirement of direct-burried with optical cable.

Description of drawings:

Fig. 1 is the schematic cross-section of buried full medium optical cable.

Embodiment:

Below by embodiment, and in conjunction with the accompanying drawings, technical scheme of the present invention is further described in detail.

This figure sequence number: 1-optical fiber, 2-PBT beam tube, the fine cream of 3-, 4-cable cream, 5-nonwoven fabrics band, 6-tygon inner sheath, 7-gasket for packing, 8-central reinforce member (FRP), 9-glass fiber yarn, 10-tygon oversheath.

Embodiment: as shown in Figure 1, cable core adopts 1+6 structure 30 cores, promptly by 5 beam tubes 2 (6 core/pipe)+1 gasket for packing 7 and central reinforce member 8, the present embodiment central reinforce member is FRP (a glass fiber reinforced plastics round bar), the elastic modulus 50GPa of FRP, diameter 2.1mm, hold 6 optical fiber 1 in the every beam tube, the surplus length of beam tube inner fiber is 0.6-1.0 ‰, beam tube takes SZ stranded in the cable core, twisting pitch/stranding angle is 60-70mm/10 π, and glass fiber yarn 9 is as the outer wrapped anti-element of opening of cable core.The present invention adopts little twisting pitch simultaneously because excess fiber length is reasonable, and optical cable is required and during high cold operation, every performance is normal in harsh mechanical propertys such as the big tensile strength of direct-burried environment; The vertical outward bag thickness of cable core is 0.15mm nonwoven fabrics band, 1.2mm thick inner sheath, and wrapped nonmetal reinforcing element twisting glass fiber yarn and oversheath are extruded simultaneously and are finished, per share glass fiber yarn is emitted tension force and is consistent, wrapping angle is reasonable, even along the inner sheath surface distributed, and extruding thickness then is the tygon oversheath of 2.0mm.Guaranteed optical cable under certain external force, the cable core of optical cable is not subjected to uneven wall pressure and tensile force, and nonmetal anti-element, the rational structure of opening of high-quality makes optical cable satisfy the needs of standard to tensile resistence, lateral pressure resistant power.Simultaneously, the optical cable manufacturing cost is lower; Remedy ordinary straight buried fiber optic cable anti-electromagnetic interference force ability, be not suitable for the defective of highfield environment.Invented the novel optical cable that can resist electromagnetic interference (EMI) to be applicable to direct-burried again.

Claims

1. buried full medium optical cable, have central reinforce member, cable core, optical fiber bundle tubes, wrapped reinforcing element and oversheath, it is characterized in that: central reinforce member adopts the glass fiber reinforced plastics round bar, and wrapped more nonmetal resisting opened the element glass fiber yarn after cable core coated the tygon inner sheath outward.

2, as claimed in claim 1. a kind of buried full medium optical cable is characterized in that:

A. the optical fiber in the beam tube is longer than beam tube, and surplus length is 0.6-1.0 ‰;

B. it is stranded that beam tube forms SZ, and twisting pitch/stranding angle is 60-70mm/10 π;

C. thickness is the 1.0mm-1.2mm inner sheath;

D. oversheath directly is coated on wrapped nonmetal reinforcing element outside closely;

2, buried full medium optical cable as claimed in claim 1 is characterized in that wrapped nonmetal reinforcing element twisting, and the glass fiber yarn lay of lapping is 600-800mm.