At present, there are three new types of cable laying at home and abroad: one is to use the air blowing installation technology will be micro-fiber optic cable or fiber bundles, fiber units blown into the pre-laying of micro-tube; the other is in the cement pavement Slot, the micro-cable cloth placed in the roadway; the third is the use of non-communication dedicated pipe installation cable.
A. Air cable for installation
The air blowing method is the use of compressed air high-speed air flow will be inserted into the designated cable. Air blowing method has a variety of advantages. In the high-speed air flow, the micro-cable in the pipeline in a suspended state, so the changes in the terrain and the bending of the pipeline on the cable is small; can use sub-tube and micro-cable to improve the optical assembly density, saving pipeline resources;
The initial deployment of only the appropriate capacity of the cable, according to the development needs of the phased expansion, the cable will be blown into the tube has been built in the tube, saving the initial delivery, to avoid a lot of fiber idle; can be added at any time according to business needs Branch, the use of Y-type connector to reduce the cable connector.
The air-blown cable is a specially designed cable for the placement of tubes and micro-pipes. Mainly sealed micro-cable and indoor and outdoor non-metallic dual-use optical cable.
A. Miniature cable
It uses fiber loose sets of stainless steel pipe structure, in addition to a miniature cable with a small outer diameter, light weight, the general characteristics, but also has excellent high and low temperature performance and anti-lateral pressure performance. Stainless steel tube is the use of laser welding made of stainless steel, it will be sealed in the fiber and fiber inside, accurate control technology to ensure that the length of the cable in the use of complex environments.
And stainless steel pipe with excellent moisture resistance and physical anti-rat, anti-ants performance and acid resistance, can give the best protection of optical fiber, to minimize the damage to the cable, air blowing with a sealed micro-cable.
B. Indoor and outdoor non-metallic dual-use cable
Fiber optic cable connection terminals and maintenance and repair locations are mostly located in the streets, residential, building or communication equipment center room. There are fire safety issues in these places, must meet the special needs: cable products with self-extinguishing, smoke-free, therefore, indoor and outdoor non-metallic dual-use cable, mostly low smoke halogen-free jacket material.
B. pavement micro-slot cable
Pavement micro-slot cable and air-blown cable has a similar structure, but also a small cable diameter, light weight cable, and low cost, easy to lay, laying flexible, simple and efficient.
China developed a stainless steel loose sets of technology based on the road micro-slot cable, optical core number up to 48 core, diameter less than 6.0mm, cable weight less than 60kg / km.
Among them, the stainless steel tube is a loose tube of optical fiber protection tube, can provide the appropriate fiber length, but also cable jacket, used to completely isolate the outside moisture into the casing, but also the cable reinforcement components, by selecting the appropriate cross-section of steel To ensure the tensile performance of the cable and flattening performance. Stainless steel tube filled with a thixotropic water-resistant composite, to ensure that the cable meets the requirements of water seepage, steel pipe is extruded polyethylene jacket.
Pavement micro-slot cable laying only need to open a narrow slot in the road, at the bottom covered with a layer of sand, the foam and other materials, the buffer layer on the sand, and then embedded in the slot cable, and then on the cable And then lay a layer of buffer layer, and finally fill the cement or asphalt according to the situation, to restore the original road can be.
In the garden, lawn, the first in the garden or lawn on the slot, then put the PVC pipe with PVC cable on top, and then back to fill the surface can be restored. Pavement micro-slot cable is very simple to solve the FTTH through the indoor and outdoor concrete floor, garden lawn and other terrain construction and deployment problems.
C. Cable for drainage pipe laying
At present, China developed and widely used in a stainless steel loose sets of technology-based, the use of layers of steel wire reinforced components for the rain pipe micro-cable, fiber core up to 48 core, diameter less than 9.6mm, cable weight less than 190kg / Km.
The stainless steel pipe in the cable is both a loose tube protection tube and a cable jacket, which can completely isolate the outside water and moisture into the casing in the sewer environment. The steel casing is easy to provide a sufficiently large and stable fiber length, which is particularly important to ensure the fiber life and attenuation temperature characteristics of the self-supporting cable. The stainless steel tube is filled with a thixotropic water blocking compound to ensure that the cable meets the requirements for water seepage.
This kind of drainage pipe laying cable, is the use of urban underground drainage pipe to lay the cable. The fixed metal parts are arranged on the hole wall of the drainage pipe, and the stainless steel hanging fittings are installed on the surface of the cable at both ends of the rainwater pipeline, and then the hanging fittings are locked on the fixed metal parts on the wall, Saddle down, was self-supporting suspension.
The cable is laid on the upper wall of the drain pipe, and it is a self-supporting hanging at the manhole at both ends of the pipe. Therefore, the cable structure is simple, light weight, small cable diameter, large packing density and large Tensile strength and softness.
In addition, the cable laying cloth in the drainage environment, but also requires good moisture resistance and corrosion resistance, and has a certain anti-rat anti-ants ability