JPH08218286A - Cable-covering pipe and production of cable-covering pipe - Google Patents

Abstract

PURPOSE: To obtain a cable-covering pipe capable of being easily fit onto or detached from a cable and enabling to rapidly and easily perform repair and exchange works by disposing a colored layer on the outer peripheral surface of a polyethylene circular cross section pipe through a polar group-having highly active primer layer. CONSTITUTION: The method for producing the cable-covering pipe A comprises forming a circular cross section synthetic resin pipe 1 having a thickness of <10mm from UV light-absorbing polyethylene containing 2-3% of carbon black, forming a polar group-having highly active primer layer 2 comprising chlorinated polypropylene, chlorosulfonated polyethylene, a pigment, etc., and having a thickness of 10-30μm on the outer peripheral surface of the synthetic pipe 1, and subsequently disposing a colored layer 3 formed by coating a fluoro coating containing UV light-shielding titanium dioxide on the outer peripheral surface of the primer layer 2 in a thickness of >= several 10μm.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cable cladding tube for coating a cable used for suspending a civil engineering structure or a building structure, and a method for manufacturing the cable cladding tube.

[0002]

2. Description of the Related Art Generally, a cable used for suspending various structures is covered with a synthetic resin pipe having a light weight and excellent mechanical characteristics, for example, a polyethylene pipe. Although this polyethylene pipe contains carbon black to improve the weather resistance, it cannot meet the demands for improving the aesthetic appearance of various structures and compatibility with the surrounding landscape because it is black.

Therefore, as a conventional technique for meeting this demand, there is a cable sheathing tube described in Japanese Patent Publication No. 6-74553. This is because the cable is coated with polyethylene pipes at the manufacturing plant to be integrated, and the cable and polyethylene pipes are transferred together to the painting process and baking process, and the polyethylene component and the primer component having a polar group on the outer surface of the polyethylene pipe. The base layer consisting of and is applied and baked, and then transferred to the coating step and the baking step in the same manner, and the colored layer is applied and baked on the outer surface of the base layer.
A cable cladding tube is manufactured.

When the cable and the cable sheathing tube are collectively transported to a construction site and used for various structures, the colored layer will satisfy the aesthetic appeal and the compatibility with the surrounding landscape.

[0005]

However, since the conventional cable cladding tube is always transferred together with the cable at the manufacturing plant, there is a problem that a large amount of work is required for the transfer and the manufacturing cost increases. It was

Further, since the cable and the cable sheath tube are collectively transported from the manufacturing factory to the construction site, the transportability is poor, and the cable sheath tube comes into contact with the surrounding objects to peel off the colored layer, thereby improving the appearance. There was a problem that the landscape adaptation function deteriorated.

Further, when the cable sheathing pipe is deteriorated, the cable and the cable sheathing pipe are collectively removed from the hanging portion and transported to the manufacturing plant, and repair work is performed through the same process as the manufacturing. The cable sheath and the cable must be collectively replaced, and a great deal of time and labor is spent on the repair work and the replacement work of the cable sheath, resulting in a large economic burden.

The present invention is intended to solve the above-mentioned problems, and it is possible to suppress the amount of work at the time of transfer in a manufacturing plant, the transportability from the manufacturing plant to the construction site is good, and the repair work and replacement work are facilitated. An object of the present invention is to provide a cable sheathing pipe and a method of manufacturing the cable sheathing pipe that can be performed.

[0009]

In order to achieve the above-mentioned object, the invention according to claim 1 is such that a synthetic resin pipe formed separately from the cable to be coated and formed on the outer surface of this synthetic resin pipe, , And a colored layer formed on the outer surface of the primer layer.

According to a second aspect of the invention, the material of the synthetic resin pipe according to the first aspect is polyethylene. According to a third aspect of the present invention, a synthetic resin pipe is molded, a primer layer having a polar group is formed on the outer surface of the synthetic resin pipe before coating the cable with the synthetic resin pipe, and the synthetic resin pipe is used. A colored layer is formed on the outer surface of the primer layer before coating the cable.

According to a fourth aspect of the invention, the material of the synthetic resin pipe according to the third aspect is polyethylene.

[0012]

According to the present invention, since the cable and the cable jacket pipe can be handled separately, the transfer in the manufacturing plant and the transportation from the manufacturing plant to the construction site can be performed by the polyethylene pipe alone. In addition, the cable sheath can be handled independently even when repairing the cable sheath.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 (A) is a cable sheath tube A according to the present invention.
FIG. 3B is a partial perspective view showing a state in which the cable B is broken in the lateral direction, and FIG.

The cable covering pipe A has a synthetic resin pipe, for example, a polyethylene pipe 1, which has a circular cross section. This polyethylene pipe 1 is molded to a thickness of less than about 10 mm,
It is made possible to absorb ultraviolet rays by containing 2 to 3% of carbon black.

On the outer surface of the polyethylene tube 1, a highly active primer layer 2 having a polar group is formed with a thickness of about 10 to 30 μm. In forming the primer layer 2, the adhesion strength between the polyethylene tube 1 and the coloring layer 3 described later is 50.
A composition having a kg / cm ² or more, for example, JP-A-3-4788
The following primer composition and the like proposed in Japanese Patent Publication No. 1 may be used.

2 to 30 parts by weight of chlorinated polypropylene (weight average molecular weight: 6 to 10 × 10 ⁴ , chlorine content: 20 to 30%) obtained by subjecting a graft polymer of an unsaturated dicarboxylic acid and polypropylene to chlorine substitution, and chlorosulfone. Polyethylene (weight average molecular weight 1-2 × 10 ⁵ , chlorine content 25-35%, sulfur content 0.5-8.5%) over 0-40 parts by weight, pigment 0-50 parts by weight, It is composed of 0 to 10 parts by weight of a vulcanizing agent, 0 to 5 parts by weight of a vulcanization accelerator, 0 to 5 parts by weight of an antioxidant, and 30 to less than 98 parts by weight of a solvent, and the total thereof is 100 parts by weight. A primer composition comprising:

Chlorinated polypropylene (weight average molecular weight 1-3 × 1
0 ⁵ , chlorine content 20 to 40%) 2 to 30 parts by weight, and chlorosulfonated polyethylene (weight average molecular weight 1 to 2 x
10 ⁵ , chlorine content 25-35%, sulfur content 0.5-
8.5%) 0 excess to 40 parts by weight, pigment 0 to 50 parts by weight, vulcanizing agent 0 excess to 10 parts by weight, vulcanization accelerator 0 to 5 parts by weight, and antioxidant 0 to 5 parts by weight. Part and 30 to less than 98 parts by weight of the solvent, and the total amount thereof is 100 parts by weight.

Graft polymer of unsaturated dicarboxylic acid and EVA (ethylene / vinyl acetate copolymer) (weight average molecular weight 1 to 2 × 10 ⁵ , vinyl acetate content 15 to 35)
%) 2 to 30 parts by weight and chlorosulfonated polyethylene (weight average molecular weight 1 to 2 × 10 ⁵ , chlorine content 25 to 3)
5%, sulfur content 0.5 to 8.5%) 0 to 40 parts by weight, pigment 0 to 50 parts by weight, vulcanizing agent 0 to 10 parts by weight, vulcanization accelerator 0 to 5 parts by weight Parts, 0 to 5 parts by weight of anti-aging agent, and 30 to less than 98 parts by weight of solvent, the total of which is 100 parts by weight.

On the outer surface of the primer layer 2, a colored layer 3 having a thickness of several tens of μm or more is formed. The colored layer 3 is formed of a fluorine paint containing a pigment capable of blocking ultraviolet rays, for example, titanium oxide.

Here, a method of manufacturing the cable sheathing tube A will be described. The polyethylene pipe 1 is extruded and molded by an extruder (not shown) in a manufacturing factory. The outer surface of the polyethylene pipe 1 is washed in the washing process.

Then, the polyethylene pipe 1 is transferred to a coating process, and the primer composition is applied to the outer surface of the polyethylene pipe 1 by a roll coater coating method, a spray coating method or the like. After that, the polyethylene pipe 1 is transferred to a baking process and subjected to a baking process at a predetermined temperature and a time, for example, with a nichrome wire heater, a far infrared heater, etc., and then the polyethylene pipe 1 is transferred to a cooling process and subjected to a cooling process to obtain a primer. Form layer 2.

Next, the polyethylene tube 1 is transferred to a cleaning step to clean the outer surface of the primer layer 2, and then the polyethylene tube 1 is transferred to a coating step to apply a fluorine coating material by the same coating method as above. Further, the polyethylene pipe 1 is transferred to the baking process and subjected to the baking process in the same manner as described above, and then the polyethylene pipe 1 is transferred to the cooling process and cooled to form the colored layer 3. The above steps are performed before the cable B is covered with the polyethylene pipe 1.

Cable sheath A produced in this way
Is transported from the manufacturing plant to the construction site, one end of the cable B in which a large number of steel wires 5 are bundled is inserted into the cable sheath A, and the winch is used to connect the cable B to the cable sheath A.
, And the coating work of the cable coating pipe A on the cable B is completed.

If a civil engineering structure, a building structure or the like (not shown) is hung by the covered cable B, the colored layer 3
This enhances the aesthetics and satisfies the compatibility with the surrounding landscape.

In the present embodiment, the cable sheathing pipe A and the cable B are separately constructed, and the cable sheathing pipe A is manufactured independently in the manufacturing plant, so that the transfer can be performed independently. Therefore, the amount of work involved in the transfer can be suppressed, and the manufacturing cost of the cable cladding tube A can be reduced.

Further, the cable sheath tube A and the cable B can be separately transported from the manufacturing factory to the construction site. Therefore,
Transportability is good, the cable sheath A does not come into contact with surrounding objects, damage to the colored layer is prevented, and the aesthetic enhancement function and landscape matching function can be maintained.

Furthermore, when the cable sheath A is deteriorated due to long-term use, the cable sheath A is replaced with the cable B.
Removed from the factory and transported to the factory for repair work.
The cable B can be coated again, or only the cable sheathing A can be replaced with a new one. Therefore, the repair work and replacement work of the cable sheathing pipe A can be performed quickly and easily in a short time, and the economical burden is reduced.

In the manufacturing process of the cable-covered pipe, if a polyethylene pipe after extrusion is provided with a longitudinal cut (not shown) connecting both end faces, the cut can be opened after the cable is hung. The work of covering and the work of removing the cable sheath from the cable can be performed. Therefore, there is another effect that the suspending work can be performed by moving the cable alone, and the suspending workability is improved.

Further, polypropylene or the like may be used as the material of the synthetic resin tube. In this case, it goes without saying that the primer composition for forming the primer layer should be selected so as to have excellent performance of maintaining the adhesive strength of the colored layer.

[0030]

As described above, according to the first to fourth aspects of the invention, since the cable and the cable sheathing tube are separately configured, the cable sheathing tube can be independently transferred in the manufacturing plant. Therefore, the amount of work involved in the transfer can be suppressed, and the manufacturing cost of the cable cladding tube can be reduced.

Further, the cable sheathing tube and the cable can be separately transported from the manufacturing factory to the construction site. Therefore, the transportability is good, the cable coating tube does not come into contact with the surrounding objects, the damage of the coloring layer is prevented, and the aesthetic improvement function and the landscape matching function can be maintained.

Further, when the cable sheath is deteriorated due to long-term use, the cable sheath is detached from the cable and transported to the factory independently for repair work, and the cable is sheathed again, or only the cable sheath is used. Can be replaced with a new one. Therefore, the repair work and the replacement work of the cable cladding tube can be performed quickly and easily in a short time, and the economical burden is reduced.

[Brief description of drawings]

FIG. 1 (A) is a partial perspective view showing a state in which a cable sheathing tube according to the present invention is laterally broken, and FIG. 1 (B) is a cross-sectional view showing a state where a cable sheathing tube according to the present invention covers a cable. Is.

[Explanation of symbols]

 1 Polyethylene tube (synthetic resin tube) 2 Primer layer 3 Coloring layer A Cable sheath tube B cable

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location D07B 7/14 D07B 7/14

Claims (4)

[Claims] 1. A synthetic resin tube formed separately from the cable to be coated, a primer layer formed on the outer surface of the synthetic resin tube and having a polar group, and a primer layer formed on the outer surface of the primer layer. And a colored layer. 2. The cable jacket pipe according to claim 1, wherein the synthetic resin pipe is made of polyethylene. 3. A synthetic resin pipe is molded, a primer layer having a polar group is formed on the outer surface of the synthetic resin pipe before coating the cable with the synthetic resin pipe, and the cable is coated with the synthetic resin pipe. A method for manufacturing a cable cladding tube, characterized in that a colored layer is formed on the outer surface of the primer layer before applying. 4. The method for manufacturing a cable sheathed pipe according to claim 3, wherein the synthetic resin pipe is made of polyethylene.