JPS63302711A - Compression clamp structure and compression work method of composite optical overhead earth wire - Google Patents

Abstract

PURPOSE:To protect an optical fiber unit, by providing a semi-split reinforcing steel pipe between an inner aluminum coated steel wire layer and an outer aluminum coated steel wire layer. CONSTITUTION:Upon finish of extending work of OPGW (composite optical fiber overhead earth wire), an anchor clamp is compressed at a scheduled fixing position. At point A in the way from the top of tower T toward a drum field D, inner layer strands 16 are left and outer layer strands 17 are cut so as to loosen the outer layer strands 17 upto the scheduled fixing position S of clamp. A semi-split reinforcing steel pipe 18 is fitted on the inner layer strands 16 at the outer circumference of an aluminum tube 15 at that position S. Then the outer layer strands 17 are stranded over the reinforcing steel pipe 18 and the inner layer strands 16. Thereafter, a clamp body 20 is fitted over the processed OPGW12 and compressed hexagonally from the outside so as to anchor the OPGW12. Since the reinforcing steel pipe 18 is applied on the OP unit (OPGW optical fiber unit), the OP unit is not collapsed when being compressed.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a compression clamp structure of an optical fiber composite overhead ground 11A (OPGW) and a compression work method thereof, and in particular,
This invention relates to protecting a PGW optical fiber unit (OP unit) using a reinforcing steel pipe.

[Prior art] or'awu has a component part as an overhead ground line and a component part as an optical fiber line (OP unit).
In order to fasten this to the steel tower, in the case of short and narrow diameter OPGW, as shown in Figure 7, the steel tower ■
0PQ using the tightening type retaining clamps 1 and 1 connected to
W2.2 is just tightened and held in place. The connection is
Connect the retaining clamps 1, 1 to 0PGW2.2 to the junction box J[3
This is done inside the junction box JB.

By the way, unlike short, m-diameter 0PGW, long, large-diameter opaws with large m nails require a large gripping force, so the above-mentioned tightening (=J-type retaining clamp cannot be used, Requires compression type retention clamp.

However, in the case of 0PGW, unlike a normal overhead ground wire, there is an OP unit in the center, so 0POW is compressed as it is using a clamp! In this case, there was a risk that the aluminum tube that made up the outer shell of the OP unit would collapse. If the aluminum tube is crushed, 0PGW
will have to be replaced.

[Problems to be solved by the invention]: As mentioned above, if you try to compress a long type of OP GW as it is with a compression tension clamp, there is a drawback that there is a great risk of the OP and E knits being crushed. Ta.

The purpose of Kodachi I'll is to solve the above-mentioned drawbacks of the conventional technology and to create a 0PGW compression clamp that can safely and reliably compress the detention clamp on the steel tower without damaging the 0pat unit. The purpose is to provide the structure and its compression work method.

[Means for solving the IFI problem] The compression clamp structure of the 0PGW of the first invention has an O
In Or'GW, which houses a P unit and has multiple layers of aluminum liquid-retained steel wire twisted around its outer periphery, an inner layer of aluminum coating t*a provided on the OP unit and an outer layer of aluminum-coated W1 steel wire are used. A half-split reinforcement WAt2 is interposed between the two, and the clamp body is fitted onto the outer periphery of the 0PGW with the reinforcing rR pipe interposed therebetween, and the clamp body is compressed and integrated.

In addition, the If shrinking work method for 0PGW of the second invention involves cutting the outer layer aluminum-coated steel wire of 0PGW while leaving the inner layer aluminum-coated steel wire on the OP unit of the OPGW, which is the premise of the first invention. Unravel the outer layer aluminum coated steel wire to the position of the retaining clamp attachment, fit the reinforcing steel pipe in half on the OP unit at the exposed mounting position, and after fitting, remove the outer layer aluminum coated m wire. After returning it to 0
The clamp body is taken at the planned mounting position of the PGW, and the clamp body is compressed from the outside of the clamp body to integrate the clamp body and the Or'GW.

[Function] If you try to insert a reinforcing steel pipe directly on top of the OP unit, it is necessary to expose the OP unit, but the inner layer of aluminum-coated steel wire is left on top of the OP unit, and the reinforcing steel pipe is placed on top of this.
If you install 4 pipes, the OP unit will not be exposed.
There is no need to

In order to expose the inner layer aluminum coated #l wire on the OP unit, it is sufficient to cut only the outer layer aluminum coated i'am wire and loosen it further.

Further, since the reinforcing steel pipe has a semi-7.11 configuration, there is no need to push the reinforcing steel pipe through the OP unit, and it can be attached by simply fitting it from the outside.

After fitting the reinforcing steel pipe, the planned installation position is reinforced by twisting the outer aluminum coating wire back.
W $1!7.

[Example] An example of the present invention will be described below based on FIGS. 1 to 5.

Figures 1 and 2 show the 0PGW compression clamp 4' of the present invention.
The dimensions of the lf model are shown. 0PGW12 is good civilian or large,
An OP unit 13 containing an optical fiber is housed in the center,
Aluminum coated steel wire 14 is twisted around the outer circumference of the
OP Nishi Nitsu! - 13 consists of an optical fiber and an aluminum tube 15 that accommodates it. Aluminum coated steel wire 1/1
It consists of a molded aluminum corrugated stranded wire 16 installed in an aluminum tube 15, and an aluminum wire FI117.17 installed 2m apart. The molded aluminum corrugated strand 16 is the inner layer on the OP unit 13, or the aluminum strand 17 provided at 2 m is the outer layer on the OP unit 13. The molded aluminum wave-tone stranded wire 16 of Or'GW12 configured in this way, and 2! r! A reinforcing steel pipe 18 for protecting the OP unit 13 is interposed between the aluminum stranded wire 17 provided in the OP unit 13. The reinforcing steel pipe 18 is interposed between the aluminum tube 15 of the OP unit 13 and the formed aluminum wave stranded wire 16 (>W can be seen, but in this case, the aluminum duplex 15 is exposed when it is interposed). Therefore, the reinforcing steel pipe 18 is provided on one layer above the OP unit 13, that is, leaving the frame 16 from the molded aluminum waveform. It has a semi-annual structure.

Eliminating the problem of inserting and attaching, it is easy to install.
This is for the purpose of

When inserting the reinforcing W4 pipe 18, a suitable dummy material 19 is filled in the gap formed at 17 frJ from the aluminum pipe provided at 2 ff'i to prevent a decrease in the compression ratio of the clamp. be done.

In this way, the clamp body 20 made of wI is provided on the outer periphery of the 0PGW 12 with the reinforcing steel pipe 18 interposed therein for protecting the OP unit 13, and is compressed into a hexagonal shape from the outside to form the clamp structure of the 0PGW. be done.

Here, it is necessary to pay particular attention to the following points regarding the reinforcing steel pipe 18. First, the inner diameter and outer diameter of the reinforcing steel pipe are important for ffI. If the inner diameter is too large, that is, the inner layer strands 16
If the gap between the outer layer and the
There is only 17 wires, and the grip strength is insufficient. For example, the gap is 095~1.0Il! Take R. If the outer layer is too large, when the outer layer strands 17 are untwisted, the gap between the outer layer and the outer layer becomes too large.

In addition, the quenching hardness of the reinforcing steel pipe is important. If it becomes too stiff, 1. There is a risk of compression.

Desirably, l-1s-55°±5° is good.

Next, the 0PGW compression FF construction method for constructing the 0PGW clamp structure as described above will be explained.

As shown in FIG. 3, when the extension of the OP G W 12 is completed, the retaining clamp is compressed using the retaining clamp attachment positioning position 1!1s surrounded by the dotted line. At that time, at point Δ on the way to the drum station after being lowered from the top of the steel tower T, 616 was left from the inner layer and wire 17 was cut from the outer layer.
Do not untwist the outer layer J and the wire 17 until you reach the planned clamp installation position S. With the mounting positioning nS, as shown in FIG.
Fit it on top of 6. Then, twist the outer layer strands 17 back onto the reinforcing steel pipe 18 and the inner layer strands 16. A suitable dummy material 19 is filled into the gap 817th from the outer layer formed at this time. Or'GW1 processed in this way
After inserting the cylindrical clamp body 20 into the outer periphery of the 0PGWI 2, it is compressed from the outside into a hexagonal shape to hold the 0PGWI 2 in place.

At point J3, Δ, as shown in FIG.

By performing compression in the same way as described, 0PGW1
2 can be connected. J3.21 is a compression type retention clamp.

In the above embodiment, since the cylindrical clamp body 20 is used, as shown in FIG. 5, the steel tower T1. Applicable only to T4. However, as shown in FIG. 6, a part of the clamp body 22 is cut out in the longitudinal direction, and a member 24 that fits into the notch 23 is provided so as to be slidable like the chopstick holder of the rt1 chopstick box. If so, it becomes possible to use compression restraining clamps not only at both ends but also at the intermediate towers T3 and T4.

As described above, according to the above embodiment, since the reinforcing steel pipe is inserted above the OP unit, there is no risk of crushing the OP unit 1- during compression. In addition, the reinforcing steel pipe is not directly inserted into the OP unit, L2, but is inserted into this L with a layer of inner stranded wire left, so the alumina 1-p of the OP unit will never be exposed. Gone, therefore OP
You will no longer have to r1 unit. Also, reinforcement w4
Since the pipe is divided into halves, the compression work can be carried out safely and reliably due to the above-mentioned effects. In addition, the inner diameter and outer diameter (Y) of the reinforcing steel pipe were set appropriately, and dummy material was filled between the outer layers to fill the gaps between the strands, so the filament 'rt'B force was also sufficient. can be satisfied.

As described above, the above-mentioned embodiment has various effects, but especially when applied to a long zero PGW such as crossing a strait, the effects are more than fully exhibited.

[Effects of the Invention] In short, the present invention provides the following excellent effects.

(1) Since the reinforcing steel pipe is installed not on the OP unit but on the inner layer of aluminum-coated steel wire provided on the 0ρ unit, the OP unit I will not be exposed when installing the reinforcing steel pipe. , there is no risk of damaging the OP unit f1.

In addition, the reinforcing steel pipe is divided into halves, making installation easier.

■ When inserting the reinforcing steel pipe, the outer layer of aluminum-coated steel wire was loosened to expose the inner layer of aluminum-coated W4 wire, and after installation, the outer layer of aluminum-coated steel wire was twisted back. There is no need to strip the aluminum-covered all wire or connect it using jumper wires, and compression and retention can be performed safely and reliably, improving work efficiency.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of an opaw compression clamp structure according to an embodiment of the present invention, FIG. 2 is a longitudinal cross-sectional view of the compression clamp structure before compression, and FIG. ! 4 is an explanatory diagram showing an example of the compression work method, Fig. 4 is an explanatory diagram of the connection of the A-cut section shown in Fig. 3, and Fig. 5 is an explanatory diagram of the 0PG extending to the steel tower
An explanatory diagram of a W retaining clamp, FIG. 6 is a 1J cross-sectional view showing a modification of the clamp body, and FIG. 7 is an explanatory diagram showing a conventional example in which a 0PGW is retained by a tightening +1 type retaining clamp. In the figure, 12 is 0PGW, 13 is OPCONIT, 14 is multilayer aluminum coated steel stranded wire, 16 is inner aluminum stranded wire, 17 is outer layer aluminum stranded wire, 18 is reinforced steel pipe,
19 is a dummy material, 20° 22 is a clamp body, 23 is a notch, 24 is a member, and S is a planned mounting position of a retaining clamp. Patent Applicant: Hitachi Cable Co., Ltd., Patent Attorney, Kinutani
NobuoFigure 1Figure 2Figure 3Figure 6

Claims (4)

[Claims] (1) In an optical fiber composite overhead ground wire consisting of an optical fiber unit containing an optical fiber housed in the center and multilayer aluminum-coated steel wires twisted around the outer periphery, the inner layer of aluminum provided on the optical fiber unit is A half-split reinforcing steel pipe is interposed between the coated steel wire and the outer aluminum coated steel wire to protect the optical fiber unit, and the reinforcing steel pipe is interposed on the outer periphery of the optical fiber composite overhead ground wire. A compression clamp structure for an optical fiber composite overhead ground wire, characterized in that the clamp body is fitted and compressed into one body. (2) The compression clamp structure according to claim 1, wherein a dummy material is filled between the aluminum-coated steel wires of the outer layer to fill the gaps between the wires. (3) The clamp body has a notch in which a portion of the clamp body is cut out in the longitudinal direction, and a member that slidably fits into the notch to close the notch. A compression clamp structure according to claim 1 or 2. (4) In a compression work method for an optical fiber composite overhead ground wire, which holds an optical fiber composite overhead ground wire consisting of an optical fiber unit containing an optical fiber in the center and a multilayer aluminum-coated steel wire twisted around its outer periphery. , Cut the outer layer aluminum coated steel wire of the optical fiber composite overhead ground wire, leaving the inner layer aluminum coated steel wire on the optical fiber unit, loosen the cut outer aluminum coated steel wire to the planned installation position of the retaining clamp, and then Fit the reinforcing steel pipe in half onto the unraveled and exposed optical fiber unit at the planned installation location, and after fitting, twist the outer aluminum coated steel wire back and clamp it at the planned installation location of the optical fiber composite overhead ground wire. A compression work method for an optical fiber composite overhead ground wire, characterized in that the clamp body and the optical fiber composite overhead ground wire are integrated by attaching a main body and compressing the clamp body from the outside of the clamp body.