JP5739379B2 - Lifting pipe - Google Patents

Description

  The present invention relates to a lifting pipe for pulling up a cable in a protective pipe buried in the ground to the ground.

  In recent years, from the consideration of road expansion and scenery, etc., plans have been made to embed and wire various cables for communication or electric power underground. The cable buried in the ground is drawn into the customer's house, etc. through a cable protection pipe branched from the common groove. For example, as disclosed in Patent Documents 1 and 2, when a cable is drawn from a cable protection tube in the ground and is raised and wired on the ground, a pulled steel tube is erected at the rising position. The pulled steel pipe is connected to the buried cable protection pipe via a bending pipe, a pipe joint, or the like, and is piped close to the outer wall surface of the building.

  A coated steel pipe that can be directly disposed outdoors is frequently used for this type of raised steel pipe. A general UC-PS pipe as a coated steel pipe has a structure in which a black protective layer in which carbon black having an ultraviolet light absorption ability is blended is provided on the outer peripheral surface of a carbon steel pipe defined in JIS G 3452. is there. When connecting such a UC-PS pipe to an underground cable protection pipe, it is necessary to partially peel off the protective layer on the outer peripheral surface to expose the internal carbon steel pipe. Therefore, a polyethylene resin that is difficult to adhere to a carbon steel pipe is used for the protective layer. Moreover, in order to improve the durability of the inner surface of the coated steel pipe, the coated steel pipe is subjected to baking treatment by applying a synthetic resin-based paint twice or more.

Utility Model Registration No. 3121141 Japanese Utility Model Publication 2-65033

  The conventional coated steel pipe needs to be connected to the cable protective pipe after partly removing the protective layer made of polyethylene resin, which is labor intensive. In addition, since the coated steel pipe has a considerable weight, if it is a construction area where there are a lot of underground buried objects or a place where the road width is narrow, it is difficult to handle and it takes time for construction.

  Recently, there are an increasing number of cases in which cables are buried underground in areas that preserve historic cityscapes or detached residential areas that emphasize landscapes. In such an area, there is a problem that the black color of the outer peripheral surface of the coated steel pipe does not adapt to the landscape and becomes conspicuous in comparison with the building. For this reason, there has been a case where the coated steel pipe is surrounded by a decorative material having the same color as the building and the coated steel pipe is hidden.

  When weather resistance is not required, a light weight vinyl chloride resin pipe may be used instead of the coated steel pipe. However, the vinyl chloride resin pipe has a problem that it is difficult to stand by itself due to its low bending strength, and it swings by the action of wind and hits the outer wall of the building. For this reason, the vinyl chloride resin tube has to be saddle-fixed to the outer wall surface, and it is necessary to open a screw hole for fixing the saddle to the outer wall surface.

  The present invention has been made in view of the above problems, and its purpose is to be lightweight and have excellent workability, excellent weather resistance of the outer surface and durability of the inner surface, and sufficient bending strength. An object of the present invention is to provide a lifting pipe that is self-supporting. Furthermore, it is providing the raising pipe | tube which can form the external appearance familiar with the building and the scenery behind in any construction area.

  The solution means of the present invention for achieving the above object is premised on a straight tubular lifting pipe that is connected to a protective pipe buried in the ground and pulls up a cable in the protective pipe to the ground. With respect to this pulling tube, a first layer on the inner peripheral side made of a thermoplastic resin material, a second layer made of a fiber-reinforced composite material provided on the outer peripheral side of the first layer, and an outer peripheral side of the second layer A pipe body having a multilayer structure including a third layer made of a thermoplastic resin material provided via an adhesive layer and a coating layer covering the outer peripheral surface of the pipe body are provided. The thermoplastic resin material of the first layer and the third layer includes a vinyl chloride resin or a flame retardant resin, and the coating layer includes a highly weather resistant resin material including an AES resin as the tube. It is configured to be heat-sealed to the main body.

  By this specific matter, it is lightweight and has excellent workability, workability, and self-standing piping that satisfies all required performance such as weather resistance, bending strength, compressive strength, impact resistance, flame retardancy, inner surface smoothness, and corrosion resistance. The possible lifting pipe can be used. That is, durability, smoothness, and flame retardance of the inner surface are ensured by the first layer, sufficient bending strength, flexural strength, and compressive strength are secured by the second layer, and from the outside by the third layer. The impact resistance can be ensured and a smooth outer surface can be formed to improve the adhesion to the coating layer. Moreover, the weather resistance of an outer surface can be ensured by the said coating layer.

  In the pulling tube having the above-described configuration, it is preferable that the high weather resistance resin material contains a colorant to color the coating layer.

  By this specific matter, it is possible to provide a coating layer having a color according to the construction location of the lifting pipe. Therefore, it is possible to make the raised pipes erected in close proximity to buildings and landscapes so that their presence is not noticeable and contribute to the formation of a good appearance.

  Moreover, in the pulling-up pipe having the above configuration, it is preferable that the thickness of the second layer is 30 to 50% of the thickness of the pipe body.

  Thereby, the required bending strength, impact resistance, compressive strength, and the like can be ensured without increasing the weight of the lifting pipe more than necessary.

  In the present invention, an inner peripheral first layer made of a thermoplastic resin material as a tube body, a second layer made of a fiber-reinforced composite material constituting the outer peripheral side of the first layer, and an outer peripheral side of the second layer And a multilayer structure including a third layer made of a thermoplastic resin material, and the outer peripheral surface of the tube body is covered with a coating layer made of a highly weather resistant resin material containing an AES resin. For this reason, it can be set as the raising pipe | tube which is lightweight and rich in workability, is excellent in the weather resistance of an outer surface and durability of an inner surface, and has sufficient bending strength.

  In addition, the lifting pipe of the present invention has a structure in which a colorant is contained in the highly weather-resistant resin material of the covering layer and the covering layer is colored, so that the lifting pipe can be adapted to neighboring buildings and landscapes. It is possible to form a good appearance and to be suitable for undergrounding of cables.

It is explanatory drawing which shows an example of the laying form of the raising pipe | tube which concerns on embodiment of this invention. It is sectional drawing of the raising pipe | tube which concerns on embodiment. It is explanatory drawing which shows the layer structure of the raising pipe | tube which concerns on embodiment.

  Hereinafter, a pulling tube according to an embodiment of the present invention will be described with reference to the drawings.

  1 to 3 show a pulling pipe according to an embodiment of the present invention, FIG. 1 is an explanatory view showing a laying form of the pulling pipe, FIG. 2 is a sectional view of the pulling pipe, and FIG. 3 is a layer of the pulling pipe It is explanatory drawing which shows a structure.

  As shown in FIG. 1, the cable 5 buried in the ground is branched in a horizontal direction from a cable protection pipe 61 buried along a road through a branch pipe joint 62, and is started up via a bending pipe 63. It is drawn into a building on the ground through the raised pipe 1 provided. The pull-up pipe 1 is a straight pipe, and the underground bending pipe 63 is connected to the lower end portion, and the waterproof cap 7 is fitted to the upper end portion.

  The pulling pipe 1 according to the illustrated embodiment includes a pipe body 2 and a coating layer 3 that integrally covers the outer peripheral surface of the pipe body 2.

  As shown in FIGS. 2 and 3, the tube body 2 includes an inner peripheral first layer 21 made of a thermoplastic resin material, and a second layer made of a fiber-reinforced composite material that constitutes the outer peripheral side of the first layer 21. 22 and a third layer 23 comprising the outer peripheral side of the second layer 22 and made of a thermoplastic resin material. Each of these layers is formed in a cylindrical shape, and adjacent layers are in close contact with each other.

  For the first layer 21 and the third layer 23, it is preferable to use a vinyl chloride resin such as polyvinyl chloride resin (PVC). Thereby, the pipe body 2 can be provided with flame retardancy, durability, weather resistance, and electrical insulation.

  Moreover, the 1st layer 21 and the 3rd layer 23 may be comprised from the flame retardant resin composition which made the thermoplastic resin contain the flame retardant.

  Examples of the thermoplastic resin include acrylonitrile / ethylene propylene rubber / styrene copolymer (AES resin), acrylonitrile / butadiene / styrene copolymer (ABS resin), acrylonitrile / styrene copolymer (AS resin), acrylonitrile / Acrylic rubber / styrene copolymer (AAS resin), acrylonitrile / styrene / acrylic rubber (ASA resin), acrylonitrile / chlorinated polyethylene / styrene copolymer (ACS resin), etc. Is mentioned.

  Further, as the thermoplastic resin, α-olefin polymers such as low density polyethylene, linear low density polyethylene, high density polyethylene, polypropylene, polybutene-1, poly-3-methylbutene, poly-3-methylpentene, etc., or ethylene- Polyolefin resins such as vinyl acetate copolymer, ethylene / propylene block or random copolymer and their copolymers, or polyesters such as polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polyhexamethylene terephthalate It may be a resin.

  Any flame retardant may be used as long as it can impart flame retardancy to the resin, and examples thereof include organic flame retardants, inorganic flame retardants, talc, and halogen-free flame retardants. As the organic flame retardant, bromine flame retardant, chlorine flame retardant, phosphorus flame retardant, nitrogen flame retardant and the like are preferable, and as the inorganic flame retardant, hydrated metal compound, metal compound, metal oxide and the like are preferable. .

  In addition, a flame retardant aid may be used in combination with a brominated flame retardant or a chlorine flame retardant, and examples of the flame retardant aid include antimony compounds such as antimony oxide and sodium antimonate, metal oxides such as magnesium oxide, Examples thereof include metal borates such as zinc borate, zinc compounds such as zinc oxide, zinc stannate, and zinc phosphate, molybdenum compounds, and the like.

  The second layer 22 is made of a fiber reinforced composite material. Examples of the reinforcing fiber constituting the fiber-reinforced composite material include glass fibers, carbon fibers, metal fibers, and inorganic fibers such as ceramic fibers. Moreover, organic fiber, such as a para-aramid fiber, a polyarylate fiber, or PBO (polyparaphenylene benzobisoxazorule) fiber, may be sufficient. Furthermore, a plurality of the above fibers can be used in combination as the reinforcing fiber. Among these, glass fiber is particularly preferable as the reinforcing fiber in consideration of the strength and price of the obtained fiber-reinforced composite material. In addition, the reinforcing fiber is preferably pretreated with a silane coupling agent in order to enhance the adhesion with the matrix resin.

  As the matrix resin constituting the fiber reinforced composite material of the second layer 22, a thermosetting resin is used as a main agent. Among them, it is preferable to use, as a matrix resin, an epoxy resin mixture mainly composed of an epoxy resin having a relatively low viscosity, excellent physical properties after curing, and low cost. In addition, a polyester resin, a phenol resin, a hard urethane resin, or the like can be suitably used as the matrix resin.

  In addition, as an epoxy resin main ingredient, a bisphenol A type epoxy resin, a bisphenol F type epoxy resin, etc. can be used conveniently. Further, since this type of epoxy resin main component has a very high viscosity, it is preferable to lower the viscosity by adding a diluent or selectively adding a low viscosity curing agent.

  Thus, by comprising the 2nd layer 22 from a fiber reinforced composite material, it is provided with high intensity | strength as the pipe body 2, and various kinds, such as heat resistance, shock absorption property, dimensional stability, and electrical insulation, are provided. It can be provided with characteristics.

  In the pulling pipe 1, the thickness of the second layer 22 along the radial direction is preferably 30 to 70% of the radial thickness of the pipe body 2. More preferably, the thickness of the second layer 22 is 30 to 50%. When the thickness of the second layer 22 is less than 30% of the thickness of the tube body 2, sufficient strength as the pulling tube 1 cannot be ensured, and the bending rigidity is poor. Further, if the thickness of the second layer 22 is thicker than 50% of the thickness of the tube body 2, the strength is increased but the weight of the lifting tube 1 is also increased, from the viewpoint of material cost and workability. It may not be preferable. When the pipe diameter of the pull-up pipe 1 is relatively large, the thickness of the second layer 22 can be set in the range of more than 50% to 70%.

  The second layer 22 and the third layer 23 are provided via an adhesive layer 24 made of an adhesive, an adhesive resin material, or an adhesive resin material. The adhesive layer 24 is preferably provided with a thickness of 0.5 mm or less. For the adhesive layer 11, when the second layer 22 is directly covered with the third layer 23 without using the adhesive layer 24, an impact force such as a person hitting or pushing after use as the lifting pipe 1 is used. There is a risk of delamination. Therefore, it is desirable to ensure the integrity of the second layer 22 and the third layer 23 by providing the adhesive layer 24.

  The coating layer 3 is made of a highly weather-resistant resin material containing AES resin. The AES resin has good adhesion to the thermoplastic resin material constituting the third layer 23, and is less susceptible to ultraviolet rays and light energy than, for example, ABS resin, and has high weather resistance. AES resin is excellent in impact resistance, chemical resistance, heat deterioration resistance, and the like. The coating layer 3 can be provided with these characteristics by being composed of a highly weather-resistant resin containing the AES resin. Various additives such as modified polyolefin may be appropriately added to the high weather resistance resin material.

  The thickness of the coating layer 3 is 0.1 to 1.0 mm along the radial direction of the tube body 2. Regardless of how the outer diameter, length, and thickness of the tube body 2 are configured, by forming with the thickness of the coating layer 3, high weatherability and good weather resistance can be obtained. Can be secured.

  As a more preferable form, the highly weather-resistant resin material constituting the coating layer 3 contains a colorant such as a pigment. Thereby, the coating layer 3 is favorably colored and constitutes the color of the appearance of the lifting tube 1. In this case, for example, thermoplastic resin-colored pellets containing a colorant may be mixed with the highly weather-resistant resin material.

  The covering layer 3 may have any color as long as it takes into account the scenery at the construction site of the lifting pipe 1 and the design of the building as the background. For example, when constructing in an area where historical style wooden buildings are lined up, it is possible to adapt the pipe 1 to the building and protect the local characteristics by using the brown covering layer 3 close to the color of the wood. it can. Moreover, when constructing in a residential area, it can be adapted to a building because it is the coating layer 3 of the light shade of white or ivory system so that it may fit the outer wall of a house. Since the coating layer 3 is made of a highly weather-resistant resin material containing an AES resin, even if it is colored in this way, it can be made difficult to cause a problem of fading over time, and can be used for a long time.

  As a method for manufacturing the pull-up pipe 1 according to the above-described configuration, for example, the thermoplastic resin material of the first layer 21 is continuously extruded into a tubular shape by an extruder and cured to thereby form the tubular first layer 21. Form. Next, reinforcing fibers impregnated with a thermosetting resin material in advance are disposed on the outer peripheral surface of the first layer 21 and heated. Thereby, the outer peripheral surface of the 1st layer 21 is continuously coat | covered with a fiber reinforced composite material layer, and the 2nd layer 22 can be shaped.

  Next, a third layer 23 made of a thermoplastic resin material is formed on the outer peripheral surfaces of the tubular first layer 21 and second layer 22. An adhesive layer 24 is interposed between the second layer 22 and the third layer 23 for the purpose of adhesion and adhesion between the layers. That is, after the second layer 22 is cured, an adhesive or an adhesive is applied to the outer peripheral surface of the second layer 22. Then, the third layer 23 is formed on the outer peripheral side of the second layer 22 and the adhesive layer 24 by an extruder. Thereby, the pipe body 2 is formed.

  The coating layer 3 is formed on the outer peripheral surface of the tubular tube body 2 formed continuously in this way. The coating layer 3 can be formed by extruding and heat-sealing a highly weather-resistant resin material using the tube body 2 as a core material. In this case, it is preferable in terms of efficiency to form the coating layer 3 immediately after the tube body 2 is formed. However, even after the time has elapsed, the tube layer 2 is supplementarily heated to thereby form the coating layer 3. Can be suitably formed.

  Moreover, you may form the coating layer 3 by discharging the molten liquid highly weather-resistant resin material to the outer peripheral surface of the rotating tube main body 2. FIG.

  By pulling and solidifying the coating layer 3 thus formed, the pulling tube 1 can be obtained.

  Since it is configured as described above, the lifting pipe 1 is lightweight and has excellent workability and workability, such as weather resistance, bending strength, compressive strength, impact resistance, flame resistance, inner surface smoothness, and corrosion resistance. Any required performance can be satisfied and self-standing piping is possible. Therefore, even if the lifting pipe 1 is piped along the outer wall of the building, there is no inconvenience that it swings due to wind pressure or hits the outer wall surface, and it can be constructed without providing a screw hole or the like on the outer wall surface. It becomes possible. In addition, by forming the coating layer 3 by coloring, it is possible to form an appearance that is familiar with the background building and the like in consideration of the landscape.

  In addition, the raising pipe 1 which concerns on this invention can be implemented with other various forms besides the said embodiment. For example, the shape of the pulling tube 1 is not limited to the cylindrical shape, and the cross-sectional shape may be any shape such as a rectangular shape, a polygonal shape, or an elliptical shape. Therefore, the above-mentioned embodiment is illustration and is not restrictive.

<Example>
Next, an embodiment of the lifting pipe according to the present invention will be described. The pulling pipe according to the present invention is not limited to the following examples.

  In each of the pulling pipes according to Examples 1 to 5, the pipe body was formed as a three-layer structure as shown in FIG.

(Example 1)
In the pulling tube according to Example 1, the first layer and the third layer are made of polyvinyl chloride resin, and the second layer is made of a glass fiber reinforced composite material using a polyester resin as a matrix resin. Further, the tube body was covered with a colored coating layer made of AES resin having a thickness of 0.2 mm.

  This pulling tube was formed with a radial thickness of 5.9 mm, of which the second layer had a thickness of 2.2 mm. The thickness of the second layer was set to 38.5% with respect to the thickness of the tube body of 5.7 mm.

(Example 2)
In the pulling tube according to Example 2, the first layer and the third layer were made of a polyvinyl chloride resin, and the second layer was made of a glass fiber reinforced composite material using a polyester resin as a matrix resin. Further, the tube body was covered with a colored coating layer made of AES resin having a thickness of 0.2 mm.

  The pulling tube was formed with a radial thickness of 4.6 mm, of which the second layer had a thickness of 1.4 mm. The thickness of the second layer was 31.8% with respect to the thickness of the tube body of 4.4 mm.

(Example 3)
In the pulling tube according to Example 3, the first layer and the third layer were made of a polyvinyl chloride resin, and the second layer was made of a glass fiber reinforced composite material using a polyester resin as a matrix resin. Further, the tube body was covered with a colored coating layer made of AES resin having a thickness of 0.2 mm.

  This pulling tube was formed with a radial thickness of 6.0 mm, of which the second layer had a thickness of 2.2 mm. The thickness of the second layer was 37.9% with respect to the thickness of the tube body of 5.8 mm.

Example 4
In the pulling tube according to Example 4, the first layer and the third layer are made of polyvinyl chloride resin, and the second layer is made of a glass fiber reinforced composite material using a polyester resin as a matrix resin. Further, the tube body was covered with a colored coating layer made of AES resin having a thickness of 0.2 mm.

  The pulling tube was formed with a radial thickness of 8.8 mm, of which the second layer had a thickness of 5.0 mm. The thickness of the second layer was 58.1% of the tube body thickness of 8.6 mm.

(Example 5)
In the pulling tube according to Example 5, the first layer and the third layer were made of a polyvinyl chloride resin, and the second layer was made of a glass fiber reinforced composite material having a polyester resin as a matrix resin. Further, the tube body was covered with a colored coating layer made of AES resin having a thickness of 0.2 mm.

  The pulling tube was formed with a radial thickness of 11.3 mm, of which the second layer had a thickness of 7.5 mm. The thickness of the second layer was 67.6% of the tube body thickness of 11.1 mm.

(Comparative Example 1)
As Comparative Example 1, a tubular body in which a three-layered tube body was coated with a coating layer made of AES resin was formed. The first layer and the third layer of the tube body were made of polyvinyl chloride resin, and the second layer was made of a glass fiber reinforced composite material using a polyester resin as a matrix resin. The coating layer was formed with a thickness of 0.2 mm.

  The tubular body according to Comparative Example 1 was formed with a radial thickness of 4.8 mm, of which the second layer had a thickness of 1.0 mm. The thickness of this second layer is 21.7% of the tube body thickness of 4.6 mm.

(Comparative Example 2)
As Comparative Example 2, a single layer vinyl chloride tube was formed by extrusion. In this vinyl chloride tube, the radial thickness was 4.5 mm.

(Evaluation method)
About the Example and comparative example of the said structure, it evaluated by the bending strength test. In this bending strength test, a test tube is set up in the vertical direction at a height of 2400mm close to the outer wall of the building, and the test conditions are set assuming that the student pushes the test tube with play or mischief. did.

  That is, in the bending strength test method, each of the pulling tube according to the example and the tube of the comparative example is installed in a horizontal cantilever shape having a span length of 2400 mm with one end as a fixed end and the other end as a free end. Carried out. Based on the average height (154.8 cm) of the sixth grader, the height of the arm when the pressing posture is taken is set to 110 cm, and the point of action of the concentrated load is a point (middle point) from the fixed end. ). A vertically downward concentrated load was applied stepwise at this intermediate point, and the amount of bending at the intermediate point and the amount of bending at the free end (tip) were measured. The amount of deflection is represented by the downward displacement (mm) from the horizontal cantilever state. The final test load was 308.9 N (31.5 kgf) in consideration of the traction force of sixth graders. (Reference materials: “Tug of war pulling ability of elementary school students from the viewpoint of physical development”, Bulletin of School of Education, School of Human Social Studies, Kanazawa University, 2009, No. 1)

Table 1 shows the measurement results of the deflection amount.

(Evaluation)
In the pull-up pipes according to Examples 1 to 5, no change such as cracks, cracks, and refraction occurred at all test loads, and only bending deformation displaced vertically downward occurred. Even after the test was completed, the pulling tube maintained a good appearance and shape. Therefore, it can be said that the pulling pipes according to Examples 1 to 5 have bending strength that can sufficiently withstand practical use.

  In contrast, in Comparative Example 1, although cracks, cracks, refraction, and the like did not occur, the tubular body was broken after the end of the concentrated load test. In Comparative Example 2, in the process of applying the concentrated load, the tip of the vinyl chloride tube was grounded due to the downward bending deformation, making it impossible to measure the amount of bending. Since these have insufficient bending strength, it can be said that conventional problems cannot be solved.

  INDUSTRIAL APPLICABILITY The present invention can be used for a pull-up pipe that is applied to underground cable.

DESCRIPTION OF SYMBOLS 1 Pull-up pipe 2 Pipe body 21 1st layer 22 2nd layer 23 3rd layer 3 Covering layer 5 Cable 61 Cable protection tube 62 Branch pipe joint 63 Bending pipe 7 Waterproof cap

Claims (3)

A straight tubular lifting pipe that is connected to a protective pipe buried in the ground and pulls up the cable in the protective pipe to the ground,
A first layer on the inner peripheral side made of a thermoplastic resin material, a second layer made of a fiber-reinforced composite material provided on the outer peripheral side of the first layer, and provided on an outer peripheral side of the second layer via an adhesive layer A tube body having a multilayer structure including a third layer made of a thermoplastic resin material, and a coating layer covering the outer peripheral surface of the tube body,
The thermoplastic resin material of the first layer and the third layer includes a vinyl chloride resin or a flame retardant resin,
The pulling pipe, wherein the coating layer is formed by heat-sealing a highly weather-resistant resin material containing an AES resin to the pipe body. The lifting pipe according to claim 1,
The pulling tube according to claim 1, wherein the highly weatherable resin material contains a colorant, and the coating layer is colored. In the raising pipe according to claim 1 or 2,
The raising pipe, wherein the thickness of the second layer is 30 to 50% of the thickness of the pipe body.

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