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Method for laying fiber bundle in subsurface plastic pipes

Method for laying fiber bundle in subsurface plastic pipes
IPC classes for russian patent Method for laying fiber bundle in subsurface plastic pipes (RU 2245567):
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Method for laying fiber bundle in subsurface plastic pipes Method for laying fiber bundle in subsurface plastic pipes / 2245567
Each section of fiber bundle disposed beyond pipeline is placed in plastic pipe whose outer diameter is smaller than that of pipeline, the latter is tightly joined through adapter to plastic pipe, plastic pipes are tightly joined with pipe connections of dead-end box made in sealed cast-iron protective casing, and fiber bundles are connected within this box. Plastic pipes holding fiber bundles are coiled in turns at permissible bending radius so as to ensure that dead-end box occurs inside one coil formed at the same time from turns of two plastic pipes or between two coils, each being formed from turns of one plastic pipe. Butt-ends of pipelines, plastic pipes holding fiber bundles, and dead-end box are placed in fiberglass shell tied to pipelines to protect them from rodents.

FIELD: subsurface laying and wiring of fiber bundles in plastic pipes using pneumatic method.

SUBSTANCE: each section of fiber bundle disposed beyond pipeline is placed in plastic pipe whose outer diameter is smaller than that of pipeline, the latter is tightly joined through adapter to plastic pipe, plastic pipes are tightly joined with pipe connections of dead-end box made in sealed cast-iron protective casing, and fiber bundles are connected within this box. Plastic pipes holding fiber bundles are coiled in turns at permissible bending radius so as to ensure that dead-end box occurs inside one coil formed at the same time from turns of two plastic pipes or between two coils, each being formed from turns of one plastic pipe. Butt-ends of pipelines, plastic pipes holding fiber bundles, and dead-end box are placed in fiberglass shell tied to pipelines to protect them from rodents.

EFFECT: enhanced reliability and service life of fiber-optic lines using light-mass fiber bundles laid in subsurface plastic pipes.

3 cl, 4 dwg

 

The invention relates to the field of underground cable laying communications, in particular to the mounting of coupling optical cables installed in underground plastic pipes pneumatic method.

There is a method of construction of fiber-optic communication lines (FOCL) plastic pipes (1, 2), which is that initially one of the known methods (cable-handling vessel, or in a pre-prepared trench) fit plastic pipes having their inner walls coating that reduces friction extend optical cable. Then the construction length of the plastic pipes are connected using a plastic couplings, these pipelines pneumatic method (using compressed air supplied from a compressor) is laid fiber optic cable for large lengths (2-4 km). In places the completion of construction of the lengths of plastic pipe with salutem them in the optical cable (s) are containers optical couplings, which through induction nozzles are inserted plastic pipes together with OK and ends OK mounted stub coupling, which together with the coils linefill OK fit into containers. The container lid and filled with soil.

The disadvantage ukazannoj the method is the containers of optical couplers having a meter in diameter, have a large area of the ejection of the frozen soil. To prevent this phenomenon in the pits perform sand and selenate bedding for installation of containers. However, in real conditions the Russian climate, especially during the spring period (February - April), when night frosts are, and day - thaw, resulting in large temperature jumps containers optical coupling “stick out” from the soil, and the containers rethermalized in the locations of the induction nozzles and filled with water, and consequently lost all of the original advantages of this method of construction of fiber optic cable and have 2-3 years there is a real likelihood of damage to the coils linefill lightweight OK, located in the container, and couplings OK that containers are without protective metal covers. Thus, the known method does not guarantee the safe operation FOL occur when the cyclic temperature changes.

The technical result of the invention is to increase reliability and service life of the fiber optic with lightweight OK, who laid in underground plastic piping.

This technical result is achieved in that the connection of the optical cables, etc is hidden in an underground plastic piping, involves splicing of fiber optic cables for stub coupling, each segment optical cable located outside the pipe, put a plastic tube having an outer diameter less than the outer diameter of the pipeline, tightly connect the pipeline with an adapter with a plastic tube, hermetically connect the plastic pipe with pipe stub coupling is performed in a sealed protective cast-iron casing, in which the spliced optical cables, with plastic pipes laid in them optic cables laid coils with the allowable bend radius so that the stub coupler were within the same Bay, simultaneously formed from two coils of plastic pipe, or between the two bays, each of which is formed of coils of one plastic tube for protection from rodents have the ends of the pipes, plastic pipes with optical cables and stub coupling in a shell made of fiberglass, which is tied to the pipeline.

In particular cases of the proposed method:

to test the tightness of the pipe before installing the shell of fiberglass from the adapter perform tight outlet tube for the production of pipes under excessive gas pressure from the control of its stability in air pressure gauge;

to install the shell of fiberglass from the clutches perform an airtight conclusion sealed copper wire connected with armour optical cable or alumina-PE sheath of the optical cable, which is connected with the earthing lead and/or controlling and measuring equipment for checking the integrity of the optical cable.

The invention is illustrated figure 1-4.

Figure 1 shows the Bay of spiral coils of pipes with OK and stub coupler to cast a protective cover placed inside the Bay.

Figure 2 shows two bays of the spiral coils of pipes with OK and stub coupler to cast a protective cover placed between the coils of pipes with OK.

Figure 3 shows the layout of the coupling relative to the ground.

Figure 4 shows the fastening of the shell from fiberglass to pipelines.

The method is implemented as follows.

After installation of the segments of the construction of the lengths of approx 1 in a plastic, for example polyethylene pipelines 2 method sadowky or pulling runs OK 1 outside of the pipes 2, put pieces of plastic pipe 3 whose length corresponds to the length of linefill OK, with the outer diameter of the plastic pipe 3 is less than the outer diameter of the pipeline 2. For example, the pipe 2 has an outer diameter 32/27 mm,and the pipe 3 are outer diameter - 25/21 mm

Then, each plastic pipe 2 is hermetically connected with the adapter 4 (e.g., using transition couplings type “SPUR”, having right-hand exterior threads at one end and left at the other) with the corresponding plastic pipe 3. Tightly connect the plastic pipe 3 pipe stub coupling 5, which are made in a sealed protective cast-iron housings, which connect segments of the optical cable 1. After the connection is OK in the coupling 5 of the plastic pipe 3 with built in them optical cable 1 is laid in coils with an allowable bend radius of the Bay 6 or Bay 7, with a dead-end clutch 5 is placed inside a coil 6 formed simultaneously from two coils of plastic pipe 3 (see figure 1), or between two bays 7, each of which is formed of coils of one of the plastic pipe 3 (see figure 2). Bays 6 and 7 contain the technological supply OK 1.

To check the tightness of the pipeline 2 from the adapter 4 can be run sealed the output tube 8 for the production of pipeline 2 under excessive gas pressure from the control of its stability in air pressure gauge (not shown).

From the clutch 5 can perform an airtight conclusion sealed copper wire 9 from the reservation OK 1 or alumina-PE sheath approx 1, which is connected with the earthing lead (the e is shown) and/or control-measuring equipment (not shown) to verify the integrity of OK1.

To protect the OK from rodents have the ends of the pipes 2, the adapter 4, the plastic pipe 3 with the optical cable 1 and the stub coupler 5 in the closed casing 10 made of fiberglass, which is tied to the pipeline 2.

After you install the shell of fiberglass is backfilling of the pit with soil.

The proposed method of connection OK can increase the reliability and service life of underground fiber-optic cable, as occurs when the buoyancy force when permafrost ucheniyah stub coupler 5, totally enclosed cast iron protective housing will be pushed into the top layers of soil, lifting as float from the center of the stacked coils Bay 6 plastic tubes 3 OK 1 or between bays 7 of the coils of plastic pipe 3 OK 1, it does not have any serious pulling efforts to plastic tubes that are located in the sockets, and OK inside sleeve that provides a stable tightness of the proposed site of the connection temperature jumps.

Sources of information:

1. Application WO/22470, CL G 02 B 6/44 published 30.04.2000.

2. V.M. Akishin, E.YE. ACC, V.V. Vinogradov, D. Noskov, “fiber-optic cables of railway communication in plastic pipelines”, journal of Automation, 1998, No. 3.

1. The method of connecting optical cables laid in Pozen the x pipelines, consisting in connecting optical cables in cul-de-SAC clutch, characterized in that each segment of the optical cable is located outside the pipe, put a plastic tube having an outer diameter less than the outer diameter of the pipeline, tightly connect the pipeline with an adapter with a plastic tube, hermetically connect the plastic pipe with pipe stub coupling is performed in a sealed protective cast-iron casing, in which the spliced optical cables, with plastic pipes laid in them optic cables laid coils with the allowable bend radius so that the stub coupler were within the same Bay, simultaneously formed from two coils plastic pipes, or between two bays, each of which is formed of coils of one plastic tube for protection from rodents have the ends of the pipes, plastic pipes with an optical cable and stub coupling in a shell made of fiberglass, which is tied to the pipeline.

2. The method according to claim 1, characterized in that to check the tightness of the pipe before installing the shell of fiberglass from the adapter perform tight outlet tube for the production of pipes under excessive gas pressure from the control of its stability in air m is nometry.

3. The method according to claim 1, characterized in that prior to the installation shell of fiberglass from the clutches perform an airtight conclusion sealed copper wire connected with armour optical cable or alumina-PE sheath of the optical cable, which is connected with the earthing lead and/or controlling and measuring equipment for checking the integrity of the optical cable.

 

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