JPH10336839A - Cable protection pipe, cable protection pipe joint and cable pipeline - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress damage, and attain continuous use even if a fire breaks out by forming a surface layer at a cable protection pipe out of non-woven fabric whose main component is cellulose fabric. SOLUTION: This cable protection pipe is constituted of an FRP layer 11 of vertical directional fabric, an FRP layer 12 of spiral fabric, an FRP layer 13 of vertical directional fabric, an FRP layer 14 of a mat or cloth fabric, and a resin impregnated surface layer 15 for forming a smooth surface. Non- woven fabric whose main component is cellulose fabric is used as fabric material of the surface layer 15, and phenol resin is used as an impregnated resin for the respective FRP layers 11 to 14, and the surface layer 15. After manufacture by a continuous extruded filament winding method, and immersion and impregnation by phenol resin bath, the non-woven fabric for surface is coated, reshaping and resin hardening are conducted, and impregnated hardening can be conducted uniformly without generating a dry spot. It is thus possible to suppress damage, and attain continuous use even if a fire occurs under a bridge.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cable protection pipe, a cable protection pipe joint, and a cable pipe, and more particularly, to a cable protection pipe which is useful for construction of a bridge-attached cable pipe.

[0002]

2. Description of the Related Art A cable protection tube made of fiber reinforced synthetic resin is lightweight, has excellent workability, is non-corrosive, is not subject to electric corrosion, is easy to maintain, is non-magnetic, and has iron loss. There is also an advantage that it can reduce the load burden on the bridge, especially when it is used as a cable line for connecting a bridge. Conventionally, for a cable protection tube made of fiber reinforced synthetic resin, usually, an unsaturated polyester is used as an impregnating resin, a glass fiber is used as a reinforcing fiber, and a polyester nonwoven fabric is used as a fiber material of a surface layer by a continuous drawing method. Molded ones are used.

[0003]

In the case of a cable line attached to a bridge, it is necessary to take measures against a misfire under the bridge. However, in the above-mentioned glass fiber reinforced unsaturated polyester tube, even if the glass fiber is nonflammable, there is a problem that the fire spreads easily due to the flammability of the unsaturated polyester. Therefore, the present inventors have conducted intensive studies on the fire spread resistance of the fiber reinforced synthetic resin tube material by simulating a fire under a bridge.As a result, if the glass fiber reinforced phenol resin tube is used, the horizontal arrangement of the tube can be improved. It was found that the fire spread could be suppressed to a small degree, and it was possible to sufficiently cope with it without imparting noncombustibility or high self-extinguishing properties to the entire length of the pipeline. However, simply replacing the unsaturated polyester with a phenolic resin in the above glass fiber reinforced unsaturated polyester, that is, a phenolic resin for the impregnating resin, a glass fiber for the reinforcing fiber, and a surface layer In the case of using a polyester non-woven fabric as the fibrous material, the state of infiltration of the resin in the surface layer becomes non-uniform, and even if the fire spread length can be suppressed short as described above, a remarkable appearance is observed in the fire spread portion. It has also been found that the properties and strength are reduced, which hinders subsequent use.

[0004] The object of the present invention is based on these findings,
An object of the present invention is to make it possible to construct a bridge-attached cable conduit that can continue to be used even if a fire occurs under a bridge, while minimizing damage.

[0005]

According to the present invention, there is provided a cable protection tube and a cable protection tube joint according to the present invention, wherein the impregnated resin comprises
The surface layer is made of a fiber-reinforced synthetic resin using a cellulose resin or a modified phenol resin, and the surface layer is formed of a nonwoven fabric containing cellulose fibers as a main component.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a case according to the present invention.
It is drawing which shows an example of a bull protection tube. In FIG. 1, 1
1 is the FRP layer of the longitudinal fiber, 12 is the FRP layer of the horizontal fiber,
Reference numeral 13 denotes an FRP layer of longitudinal fibers, 14 denotes an FRP layer of mat or cloth fibers, 15 denotes a resin-impregnated surface layer for providing a smooth surface, and the surface layer 15
A non-woven fabric mainly composed of cellulose fibers is used as the fibrous material, and a phenol resin or a modified phenol resin such as melamine is used as an impregnating resin for each of the FRP layers 11 to 14 and the surface layer 15. A modified phenol resin is used. Glass roving or glass yarn can be used for the fibers of the FRP layers 11 and 13 of the longitudinal fibers and the fibers of the FRP layer 12 of the horizontally wound fibers.
The fibers of No. 4 include glass mats (strands cut to an appropriate length and pressed into a non-woven fabric), glass cloth (cloth woven from glass yarn), glass roving cloth (glass roving cloth). Woven cloth) can be used. Instead of these glass fiber materials, carbon fiber materials and aramid fiber materials can also be used.

[0007] The nonwoven fabric mainly composed of cellulose fibers contains 95 to 80% by weight of polynosic fiber, preferably 90 to 85% by weight, and the balance is other desired fibers such as propoxy. Phosphazen [N = P-
(OC ₃ H ₇ ) ₂ ] n. The above-mentioned phenolic resin and modified phenolic resin include a resin for casting.
Type is used. The dimensions of the cable protection tube are usually 3 to 6 m in length and 2 to 5 mm in thickness, preferably 3 to 4 mm.
mm.

The above-mentioned cable protection tube is usually manufactured by a continuous drawing filament winding method, and as shown in FIG. 2, an uncured multilayer body s ₁ formed on a mandrel 16 is guided to a heating mold 17 ( the tip of the mandrel 16 has reached the exit of the die 17), the resin cured with shaping in mold 17, the take-off Lilo - and fixed-length cut by the cutter -19 while taking over the cured molded article s ₂ by Le 18 You can use the following method. In FIG. 2, p indicates a phenol resin bath, 111 and 131 indicate glass rovings for longitudinal fibers, 121 indicates a glass roving for horizontal winding, and 141 indicates a glass mat, respectively. each material with the take-up of the hardened molded body s ₂ by Le 18 is fed, each phenol - is immersed impregnated Le resin bath p, either come up to the vertical direction over the entire circumference of the mandrel 16, or Yokomaki is impregnated multilayer body s ₁ and is formed in the mold inlet to the resin-impregnated multi-layer body s ₁ of the uncured Sa - nonwoven 151 for face is coated, a resin curing line together with the shaping between the die passage We, the cured molded body s ₂ is the take-off Lilo - le 1
8 and are cut by a cutter 19 to a fixed size. In the above, at the entrance of the die 17 support was placed over the outer surface of the multilayer body s ₁ uncured - cellulose for face - to scan nonwoven 151, Hitami before uncured multilayer body s ₁ of the resin is cured The cellulose non-woven fabric 1
A surface layer using fibrous material 51 is formed integrally with the resin-cured multilayer body without generating so-called dry spots.

FIG. 3A shows a joint for a cable protection tube according to the present invention, which is a tubular body made of fiber-reinforced synthetic resin using phenol resin or modified phenol resin as an impregnating resin.
Cellulose fiber as a main component (for example, the ratio of cellulose fiber to all fibers of the nonwoven fabric is 95% by weight to 80% by weight)
Is used as a fiber material of the surface layer, and an annular groove 101 is machined by cutting or the like on the inner surface of one end. The dimensions of this cable protection tube joint are usually 250 to 5
00 mm and a thickness of 5 to 10 mm. The joint for a cable protection tube according to the present invention is wound while the resin impregnated fiber material is traversed on a rotating mandrel coated with a release agent such as a silicone-based filament release method or a filament winding method. After winding a predetermined amount, the resin is cured, and then the mandrel is pulled out.) Or a sheet winding method (a resin glass cloth is wound around a rotating mandrel coated with a release agent such as silicone). After the winding of a predetermined amount, the resin is cured, and then the mandrel is pulled out.) The impregnated resin is made of fiber-reinforced synthetic resin of phenol resin or modified phenol resin, and the cellulose fiber is By manufacturing a tubular body using a nonwoven fabric containing the main component as a fiber material of the surface layer, cutting the tubular body to a predetermined length, and cutting an annular groove on the inner surface at one end. Rukoto can.

In order to join a cable protective tube with the joint according to the present invention, as shown in FIG.
The rubber protection tube 3a is attached to the rubber ring 102 inside one end of the joint 10.
(Circular or square cross section, for example, made of butyl rubber)
And the other cable protection tube 3b is connected to the joint 10
Can be adhered to the other end of the cable with an adhesive 103, for example, an epoxy-based adhesive. The inner ends of both cable protection tubes 3a and 3b can be smoothly drawn in. It is preferable to chamfer. Further, it is preferable to provide a gap between the ends of the cable protection tube so that the ends of the cable protection tube do not come into contact with each other even if the cable protection tube extends in summer or the like. The joint structure of the cable protection tube by the joint according to the present invention can be a rubber ring joint system at both ends.

In the cable protection tube and the joint according to the present invention, the nonwoven fabric of the surface layer is mainly composed of cellulose fibers, and the phenolic nonwoven fabric of this nonwoven fabric is used.
It has good wettability to the resin solution and can uniformly impregnate and harden the surface layer with phenol resin without generating dry spots. Thus, according to the cable protecting tube and the joint according to the present invention, compared with the fiber reinforced unsaturated polyester tube material, even if the tube is exposed to a flame, the fire spread of the tube can be kept light,
It is possible to cope with a misfire under a bridge without adding non-combustibility or a high degree of self-extinguishing property to the entire length of the pipeline.
The advantage of using a cable resin tube is that it can avoid discoloration and decrease in strength of the dry spot portion of the surface layer in the portion exposed to the flame, and can continue to use the cable protection tube without any trouble. Is obtained. This is clear from the test results described below.

[Test] The used samples are as follows. Sample 1 This is a sample of the cable protection tube according to the present invention, which has a structure shown in FIG. 1, and has glass roving for longitudinal fibers and weft-wound fibers, glass mat for mats, and surface layer. A cellulose nonwoven fabric having a thickness of 400 μm and a fiber amount of 30 g / mm ² was used for the nonwoven fabric, and the phenol resin had a viscosity of 10 to 60 poise at 25 ° C. and a standard gel time at 120 ° C. of 3 And a specific gravity of 1.2, using the continuous drawing filament winding method described above at a mold temperature of 200 ° C. and a drawing speed of 1 m / min.
The sample had an outer diameter of 131 mm and a thickness of 3 mm. Sample 2 A nonwoven fabric of the surface layer was 300 μm thick and had a fiber amount of 3
Except for using a polyester nonwoven fabric of 4 g / mm ² , the same was applied to the sample, the mold temperature was 200 ° C., and the drawing speed was 1 m / min. Sample 3 A resin having a viscosity of 8 to 12 poise at 25 ° C, a standard gel time at 80 ° C of 4 minutes, and a specific gravity of 1.2 was used. The mold temperature was 160 ° C and the drawing speed was 1 m. /
It was the same as the sample except for the min.

Test 1 As shown in FIG. 4A, a U-shaped cross section and a length of 3500
mm galvanized iron frame (open at both ends) 4 on the ground,
A sample having a length of 3000 mm is placed in the frame at a height e from the ground.
= 600 mm, three pipes are arranged in parallel at an interval f = 200 mm, and one end of all pipes is ignited with a flame using gasoline as a fire source inside one end of the galvanized steel frame 4 to ignite the pipes. Removed. The sample and the sample completely self-extinguished 5 seconds after removal of the fire source, but the sample did not extinguish itself,
It burned completely in 50 seconds. Test 2 As shown in (b) of FIG. 4, the height from the ground e = 600
mm and g = 800 mm, two steps, tube spacing f = 200
The self-extinguishing property was tested in the same manner as in Test Example 1 by arranging six wires in mm. After ignition of the sample and the sample, self-extinguishing was completed 10 seconds after the removal of the fire source, but the sample did not extinguish itself, but spread and burned completely in about 600 seconds.

As is clear from these test results, the glass fiber reinforced unsaturated polyester tubing completely burns, but the flame does not easily run even if ignited with the glass fiber reinforced phenolic resin tubing, and the fire spread is sufficiently delayed. When the contact time with the flame is short, it is possible to extinguish the fire sufficiently without reaching full-length combustion. In addition, from the appearance inspection with the sample, a dry spot was observed in the sample, and in the portion where the flame was touched, the fading of the dry spot was observed, but such abnormalities were not observed in the sample, and continued use without hindrance I was ready to go. As is clear from the test results,
In the cable pipeline according to the present invention, even if the cable is exposed to a flame, the fire spread of the pipe can be suppressed to a small extent. Therefore, even if the entire length of the pipeline is not provided with noncombustibility or a high degree of self-extinguishing property, it can be used under a bridge. It is possible to cope with bonfires, and it is possible to control the appearance of the surface layer in the part exposed to the flame, and to keep it intact.

[0015] The cable protection tube and the joint according to the present invention are connected to a cable.
If it is used for a bridge substructure in a bull conduit, it can prevent fire spread from a bonfire under the bridge and assure stable power supply and communication. FIG. 5 is a drawing showing an example of a cable part of a bridge-attached cable using a cable protection tube according to the present invention. In FIG. 5, B is a bridge. Reference numeral 21 denotes a water surface of the river, and reference numerals 22 and 22 denote ground portions of the river. Reference numerals 3 and 3 designate underground pipe sections on both sides of the bridge, and steel pipes, concrete pipes, resin concrete pipes and the like are used. A is a bridge extension pipe section, and a is a river ground 22 of the bridge extension pipe section A.
A pipe section having a height of 5 m or less from above is indicated, and a 'is a remaining pipe section. In FIG. 5, the height h at the point p ′ is 5 m, and the distance w from the bridge end to the point p is usually within 15 m. The above-mentioned bridge installation pipeline case
The pipe section a having a height of 5 m or less from the river ground 2 of the cable protection pipe is constituted by joining the fiber protection pipe made of the fiber-reinforced phenol resin according to the present invention with a joint, and The remaining pipe section a 'of the auxiliary pipe section A is joined with a fiber-reinforced unsaturated polyester pipe material (fibers do not have to be nonflammable, but glass fibers are usually used for cost reasons). There is a configuration. The length L of the tube material is set to 3 to 6 m in consideration of workability in transportation and work at high places, weight reduction, and the like. For joining of the pipe material by a joint, for example, a structure in which the joint is integrated with one end of the pipe material in advance and the joint and the other end of the mating pipe material are slidably joined via a rubber ring can be used. The joint of the bridge portion a in which the height of the bridge extension pipe portion A from the river ground 2 is 5 m or less is made of a material that is more flame-retardant than glass fiber reinforced unsaturated polyester resin,
For example, it is preferable to use a fiber-reinforced resin joint or a metal (for example, steel) joint using a phenol resin or a modified phenol resin, for example, a melamine-modified phenol resin. Remaining pipeline part a 'of the bridge-attached pipeline part A
And a joint between the pipe section a 'and the underground pipe section 3 may be a fiber-reinforced resin joint using a phenol resin or a modified phenol resin, for example, a melamine-modified phenol resin. Metal fittings can be used. The joint for a cable protection tube according to claim 3 or 4 can also be used for a fiber reinforced resin joint using such a phenol resin or a modified phenol resin, for example, a melamine-modified phenol resin. . The pipelines are usually laid in a multi-stage manner. In a bridge attachment part, a multi-stage shelf is assembled in a lower portion of the bridge, and a large number of pipelines are arranged in parallel at each stage of the shelf.

In the above-mentioned bridge-attached cable conduit,
Although the river ground exists on both sides of the river water surface, as shown in FIG. 6, when the river ground 22 exists only on one side of the river water surface 1, the bridge end side portion a on the one-side river ground 22
The fiber-reinforced phenol resin cable protection tube according to the present invention is used for the pipe material (part 5 m or less from the river ground), and the fiber-reinforced unsaturated polyester resin pipe material is used for the other part a '. Can be used. The above pipe section a '
In place of the fiber reinforced unsaturated polyester tube, a fiber reinforced epoxy resin tube or a fiber reinforced vinyl ester resin tube may be used.

[0017]

The cable protection tube and the joint according to the present invention are made of fiber-reinforced phenol resin, and the flammability of the phenol resin and the horizontal direction of the ignition flame against a fire under a bridge. Due to the difficulty in running, it is possible to self-extinguish the fire by keeping the fire spread lightly. In addition, the surface layer can be in a homogeneous state without dry spots, avoiding deterioration in appearance and strength due to discoloration in the areas exposed to the flame at the dry spots, and continuing to use the pipeline without hindrance it can. In addition, a bridge subduct that can guarantee lightness and corrosion resistance and can withstand long-term use can be constructed with good workability. Therefore, according to the present invention, even if a fire occurs under the bridge, it is possible to easily construct a corrosion-resistant bridge-attached cable conduit portion that can be used continuously while minimizing damage.

[Brief description of the drawings]

FIG. 1 is a view showing a cable protection tube according to the present invention.

FIG. 2 is a view showing a molding apparatus used for manufacturing a cable protection tube according to the present invention.

FIG. 3 is a view showing a cable protection tube joint according to the present invention and a usage form thereof.

FIG. 4 is an explanatory view showing a self-extinguishing test of the cable protection tube according to the present invention.

FIG. 5 is a view showing an example of a cable line for supporting a bridge using a cable protection tube according to the present invention.

FIG. 6 is a view showing an example of a cable line for connecting a bridge using a cable protection tube according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Joint 11 FRP layer of longitudinal fiber 12 FRP layer of weft fiber 13 FRP layer of longitudinal fiber 14 FRP layer of mat or cloth fiber 15 Surface layer

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Tomio Kawabe 1-1-2 Shimohozumi, Ibaraki-shi, Osaka Nitto Denko Corporation

Claims (6)

[Claims] 1. A non-woven fabric which is made of fiber reinforced synthetic resin using phenol resin or modified phenol resin as an impregnating resin, and has a cellulose fiber as a main component is used as a fiber material of a surface layer. Cable protection tube characterized by the above-mentioned. 2. The cable protecting tube according to claim 1, wherein the ratio of the cellulose fibers to the total fibers of the nonwoven fabric is 95% by weight to 80% by weight. 3. A fiber reinforced synthetic resin using a phenol resin or a modified phenol resin as an impregnating resin, and a nonwoven fabric mainly composed of cellulose fibers is used as a fiber material of the surface layer. A joint for a cable protection tube characterized by the above-mentioned. 4. The joint for a cable protection tube according to claim 3, wherein the ratio of the cellulose fibers to the total fibers of the nonwoven fabric is 95% by weight to 80% by weight. 5. The cable protection tube in a bridge substructure portion according to claim 1.
Or a cable conduit using the cable protective tube according to 2. 6. A fiber-reinforced synthetic resin joint using a phenolic resin or a modified phenolic resin as an impregnating resin, between the cable protection tubes at the bridge-attached portion.
The described cable conduit.