JP3137165U - Protective fence - Google Patents

Abstract

An object of the present invention is to provide a highly durable protective fence by preventing vertical cracks occurring at the base portion of a column.
A protective fence 10 according to the present invention is configured such that a hollow portion between an insertion hole 22 for a trunk edge 16 formed at a lowermost portion formed in a support column 14 and a lower opening end 15 of the support column 14 is embedded by an embedded member 30. Fill it up and make it solid. Thereby, since water does not collect below the position of the insertion hole 22 located at the lowermost portion, the problem of vertical cracks occurring in the support column 14 can be solved, and a highly durable protective fence 10 is provided. it can.
[Selection] Figure 3

Description

  The present invention relates to a protective fence, and more particularly to a protective fence that is highly durable against cold regions.

  In outdoor facilities such as airfields, protective fences are provided around the facility to prevent entry into the facility. As is well known, such a protective fence has a plurality of support columns standing in the vertical direction, a plurality of trunk edges bridged horizontally between these support pillars, and a predetermined interval between these trunk edges. It is comprised from the several grating | lattice inserted by the formed insertion hole and attached to the perpendicular direction. In addition, there is a sharp member called Shinobi that is inclined toward the outside of the facility at the top of the support fence post, and there is also a known Shinobi line that has a Shinobi line. .

Further, it is known that the protective fence used as an airport fence is made of fiber reinforced plastic instead of steel in order to avoid radio interference, that is, to have radio wave permeability. In particular, Patent Document 1 discloses a non-metallic fence in which a plastic net is stretched on a frame member made of fiber reinforced plastic. Further, a protective fence made of glass fiber reinforced plastic (product name: Plaalloy (registered trademark), manufactured by AGC Matex Co., Ltd.) is also known as a protective fence for airport fences.
JP 2000-192694 A

  By the way, when a conventional protective fence is installed for several years, a vertical crack 3 is formed at the base portion of the support column 1 (the portion immediately above the portion of the base 2 buried with concrete) as shown in FIG. There was a problem that occurred. In FIG. 5, reference numeral 4 denotes a trunk edge, and reference numeral 5 denotes a lattice.

  This invention is made | formed in view of such a situation, and it aims at providing a highly durable protective fence by preventing the vertical crack which generate | occur | produces in the base part of a support | pillar.

  In light of the phenomenon that vertical cracks 3 occurring in the root portion of the column 1 occur in a cold region, the inventor of the present application freezes the rainwater and snowmelt water accumulated in the hollow column 1 and the freezing expansion pressure thereof. It was estimated that the vertical crack 3 was generated in the column due to the cause of the vertical crack 3. Then, in order to verify whether or not the estimation was correct, a freezing experiment was conducted in which water was stored in the support column, and a vertical crack occurred in the support column. Further, when the water intrusion route into the support column is estimated, the support column is a hollow member, but a cap for water stop is attached to the upper opening end, and it is difficult to consider entering from this portion. On the other hand, it was confirmed that a plurality of connection holes for connecting the trunk edge to the support pillar were formed on the support pillar along the support pillar, and water entered from the gap between the connection hole and the trunk edge. Furthermore, it was confirmed that the vertical crack occurred below the position of the connecting hole located at the lowermost portion of the connecting holes. From these confirmation items, the inventor of the present application collected the water that entered from the gap between the connecting hole and the trunk edge below the position of the connecting hole located at the bottom, and the accumulated water was frozen. It was found that this was the cause of vertical cracks.

  Therefore, in order to achieve the above-mentioned object, the invention according to claim 1 has a plurality of cylindrical pillars erected in the vertical direction and a plurality of bridges horizontally bridged between the plurality of pillars. In the guard fence provided with a bookcase rim, a plurality of connection holes for connecting the body rim to the support posts are formed in the support posts along the support posts, and at least among the plurality of connection holes. A hollow portion between the connecting hole located at the lower portion and the lower opening end of the support column is filled with an embedded member to form a solid shape.

  According to the first aspect of the present invention, since the hollow portion between at least the connecting hole located at the lowermost portion and the lower opening end of the support column is filled with the embedded member to form a solid shape, the lowermost portion Water does not accumulate below the position of the connecting hole located at the bottom. Thereby, the problem of the vertical crack can be solved and a highly durable protective fence can be provided. In addition, the water that has entered from the gap between the connecting hole of the support column and the trunk edge is drained from the connecting hole located at the bottom due to the presence of the embedded member, so that the water may freeze in the support column. It can also prevent other problems caused by freezing. The same effect can be obtained even when the lower part of the connecting hole located other than the lowermost part is buried with the buried member, but this makes the buried member larger, the column becomes heavy and the workability deteriorates, It is preferable that the buried member is buried only below the connecting hole located at the lowermost part.

  The invention described in claim 2 is characterized in that, in claim 1, the embedded member is embedded so as to be flush with the lower end edge of the connecting hole in the horizontal direction.

  According to the second aspect of the invention, it is preferable from the viewpoint of drainage that the buried member is buried so as to be flush with the lower end edge of the connecting hole of the support column in the horizontal direction.

  The invention described in claim 3 is characterized in that, in claim 1 or 2, the embedded member is a foam having closed cells.

  According to the third aspect of the present invention, it is preferable to apply a foam having closed cells, for example, a polyethylene foam, as the embedded member, because the strut becomes light and the workability is improved. Moreover, since it is a foam having closed cells, the liquid that has entered does not soak into the foam and is drained to the outside through the connecting hole located at the bottom. This is preferable because a highly durable embedded member can be provided.

  According to the guard fence according to the present invention, the hollow portion between at least the lowermost connecting hole and the lower opening end of the support column is filled with the embedded member to form a solid shape. It can be eliminated and a highly durable protective fence can be provided.

  Hereinafter, preferred embodiments of a protective fence according to the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is a perspective view showing an example of a protective fence 10 as an airport fence provided around an airfield facility, and FIG. 2 is an assembled perspective view of the protective fence 10.

  This protective fence 10 has five pillars 16, 16..., Which are erected on the base 12 in the vertical direction, five trunk edges 16, 16. It is comprised from the some grating | lattice 20, 20, ... which was inserted in the insertion holes 18, 18 ... formed in the trunk | limb edge 16,16 ... with the predetermined space | interval, and stood in the perpendicular direction. The trunk edges 16, 16 arranged on both sides of the support pillar 14 are connected via a tubular trunk edge joint 24 fitted and arranged in the insertion hole (connection hole) 22 of the support pillar. That is, by inserting the trunk edge joint 24 into the end opening of the trunk edge 16, the trunk edges 16, 16 arranged on both sides of the support column 14 are connected. Further, the upper portion of the support column 14 is bent toward the outside of the facility to form a crease portion 26, and a plurality of crease lines 28, 28. Note that the number of the trunk edges 16 is not limited to five, and may be two or more in order to support the lattice 20 vertically. Moreover, although the height of the protection fence 10 is set arbitrarily, it is preferable that it is 3 m or more so that it cannot get over easily.

  In the support post 14 of the protection fence 10 according to the present invention, insertion holes 22, 22... Corresponding to the number of the trunk edges 16 are formed vertically along the support post 14, as shown in FIG.

  Among these insertion holes 22, 22..., The hollow portion between the insertion hole 22 located at the lowermost part and the lower opening end 15 (see FIG. 3) of the column 14 is embedded in the embedded member 30 as shown in FIGS. It is filled with solid material.

  According to this protective fence 10, the hollow portion between the insertion hole 22 located at the bottom and the lower opening end 15 of the column 14 is filled with the burying member 30 and configured in a solid shape. Water does not accumulate below the position of the insertion hole 22 positioned.

  Thereby, the problem of the vertical crack 3 (see FIG. 5) generated at the lower part of the column 14 can be solved, and the highly durable protective fence 10 can be provided.

  Further, the water that has entered from the gap between the insertion hole 22 of the support column 14 and the trunk edge 16 is drained from the insertion hole 22 located at the lowest position due to the presence of the embedded member 30, so that Freezing can be prevented, and other problems caused by freezing can also be prevented. The same effect can be obtained even when the buried member 30 is buried below the insertion hole located at a position other than the lowermost portion. However, this causes the buried member 30 to be enlarged and the support column 14 to be heavy, resulting in poor workability. Therefore, it is preferable that the buried member 30 is buried only below the insertion hole 22 located at the lowermost part.

  Moreover, as shown in FIG. 4, it is preferable from a drainage viewpoint to bury the embedding member 30 so that it may become flush | planar with the lower end edge part 22A of the insertion hole 22 of the support | pillar 14 in a horizontal direction.

  Furthermore, the material of the embedded member 30 is preferably a metal material, an organic material, or an inorganic material that is excellent in water resistance and corrosion resistance. As a specific example, if it is a metallic material, stainless steel, aluminum, brass, etc. can be illustrated. Moreover, if it is an organic material, a thermoplastic resin, thermosetting resin hardened | cured material, rubber | gum, or the foam etc. which have those closed cells can be illustrated. In particular, a foam having closed cells is preferable. Specifically, foamed polyethylene, foamed polypropylene, foamed polystyrene, foamed polyurethane resin, foamed polyurethane rubber, foamed vinyl chloride resin, foamed EVA resin, foamed ABS resin, foamed polyamide resin, Examples thereof include foamed acrylic resin, foamed phenol resin, foamed silicone resin, foamed silicone rubber, and foamed epoxy resin. In particular, foamed polyethylene, foamed polystyrene, foamed polyurethane, and foamed silicone rubber are more preferred, and foamed polyethylene is most preferred because it is inexpensive and excellent in properties. Thus, if the foam which has an independent cell is applied as the burying member 30, the infiltrated liquid will not permeate into the foam, but will be drained outside from the insertion hole 22 located in the lowermost part. This is preferable because a highly durable embedded member can be provided.

  On the other hand, examples of the inorganic material include glass and concrete, and examples of the composite material include composite materials of the above materials (resin concrete, FRP, and the like).

  Among the above materials, a resin foam is particularly preferable from the viewpoint of durability and workability because it has good water resistance and corrosion resistance and is very light. In addition, since the resin foam is lighter than other materials, the workability to insert into the support column is good and the unit weight of the fence member does not increase significantly. Workability can be secured.

  On the other hand, the protective fence 10 is made of fiber reinforced resin that is reinforced plastic. Since the fiber reinforced resin has a characteristic that it is difficult to be cut with a blade, it is suitable for a member that is exposed and installed among members constituting the protective fence 10, and is particularly applicable to a member that is easily cut when entering. It is more preferable. In the example of FIG. 1, it is preferable to manufacture the support | pillar 14, the trunk edge 16, and the grating | lattice 20 with fiber reinforced resin, and it is preferable to make at least the grating | lattice 20 into fiber reinforced resin.

  The shapes and dimensions of the column 14, the trunk edge 16, and the lattice 20 can be set as appropriate according to the application. For example, in the case of the protective fence 10 surrounding an airfield, the shapes of the support column 14, the trunk edge 16, and the lattice 20 are not particularly limited, but a round bar shape is preferable. Although the thickness is not particularly limited, the diameter of the column 14 is preferably 50 to 130 mm (the inner diameter of the column 14 shown in the embodiment is 70 mm and the outer diameter is 89 mm), and the diameter of the trunk edge 16 is preferably 10 to 50 mm. A preferable diameter of the grating 20 is 6 mm or more and 16 mm or less.

  Moreover, it is preferable that the member which comprises the guard fence 10 consists of the surface layer provided with the rod-shaped core material which consists of a hardened | cured material of the fiber reinforced resin which made the reinforcement fiber impregnated the matrix resin composition, and the nonwoven fabric. The surface layer is formed of a cured product obtained by impregnating a non-woven fabric with a part of the matrix resin composition contained in the fiber reinforced resin constituting the core material. That is, the core material and the surface layer are integrated by a cured product of the matrix resin composition that exists continuously across the both.

However, the surface layer for improving the surface property is not essential. The material of the nonwoven fabric is not particularly limited. The basis weight of the nonwoven fabric is not particularly limited, but 20 to 140 g / m ² is preferable.

<Fiber reinforced resin>
The fiber reinforced resin constituting the core material is obtained by impregnating a reinforcing resin with a matrix resin composition. That is, the core material consists of a cured product of the matrix resin composition and reinforcing fibers.

[Reinforcing fiber]
(Glass fiber)
As the reinforcing fiber constituting the fiber reinforced resin, glass fiber is preferable from the viewpoint of strength and price. The glass fiber may be either a short fiber or a long fiber. Glass fibers include yarns made of E-glass fibers, S-glass fibers, alkali-resistant glass fibers, rovings, roving cloths, knitted fabrics, blinds, CSM (continuous strand mat), CM (chopped strands). -Mat), knit mat, and strand are more preferable. The filament diameter of the glass fiber is preferably 6 to 35 μm (preferably 11 to 27 μm), and the strand count of 100 to 10,000 tex.

(Hard-cut fiber)
As the reinforcing fiber constituting the fiber reinforced resin, in addition to the glass fiber, a hard-to-cut fiber having hard-to-cut properties is also preferable. The hard-to-cut fiber is a fiber having a property that is difficult to cut with a blade. Specifically, a fiber having high toughness is used. Here, toughness refers to the tenacity of the material, and in order to express toughness quantitatively, the value of “total strain energy” corresponding to the area surrounded by the breaking point in the fiber stress-strain line curve is used. Yes (reference: FRP glossary, reinforced plastics association, 1983, p. 76). The larger the “total strain energy” value, the higher the toughness and the harder to cut. Specifically, the hard-cut fiber has a total strain energy per unit area and unit length of preferably 5 N · mm or more, more preferably 10 N · mm, and even more preferably 15 N · mm or more.

  Specific examples of the difficult-to-cut fibers include aramid fibers, polyethylene fibers, polyester fibers, polyparaphenylene benzobisoxazole fibers (PBO fibers), polyvinyl alcohol fibers (PVA fibers), and metal fibers. Hardly cut fibers may be used alone or in combination of two or more.

  Among the above, aramid fibers and metal fibers are particularly preferable from the viewpoint of cutting strength. Specific examples of the metal fiber include copper wire, aluminum wire, steel wire (including piano wire) and the like.

  From the viewpoint of hardly causing radio interference, one or more non-metallic fibers selected from aramid fibers, polyethylene fibers, polyester fibers, polyparaphenylene benzobisoxazole fibers and polyvinyl alcohol fibers are preferable.

  The difficult-to-cut fibers are continuous fibers (long fibers), short fibers, or cloth materials, and are arranged so that the difficult-to-cut fibers exist in the entire length direction of the core material. The thickness of the difficult-to-cut fiber is not particularly limited as long as the desired cut-resistant strength can be obtained. However, in consideration of manufacturability and cost, the non-metallic fiber has a fineness of about 5 to 15000 tex. Is preferred. In the case of metal fibers, the wire diameter is preferably about 0.1 to 4 mm.

  In addition, the nonwoven fabric which is the form in which the monofilament was entangled is not contained in the reinforcing fiber in this invention.

  The ratio of difficult-to-cut fibers to the entire reinforcing fibers contained in the fiber reinforced resin is determined within a range in which the required cut resistance can be achieved. When the difficult-to-cut fiber is a non-metallic fiber, the volume is preferably 5% by volume or more, more preferably 10% by volume or more, and further preferably 25% by volume or more. When the hard-to-cut fiber is a metal fiber, 0.2% by volume or more is preferable, 0.8% by volume or more is more preferable, and 1.3% by volume or more is more preferable. In any case, good cutting resistance of the protective fence can be obtained by setting the above lower limit value or more.

  Cutting resistance improves as the proportion of hard-cutting fibers in the entire reinforcing fiber increases. The upper limit of the ratio of the difficult-to-cut fibers may be 100% by volume, but from the viewpoint of cost reduction, it is preferable to reduce the ratio of the difficult-to-cut fibers as long as the required cutting resistance can be achieved. For example, the ratio of the hard-cut fiber is preferably 95% by volume or less, more preferably 70% by volume or less, and further preferably 60% by volume or less.

[Matrix resin composition]
The matrix resin composition contains a matrix resin as a main component and other additives as necessary.

  As the matrix resin, any of a thermosetting resin and a thermoplastic resin can be used and is not particularly limited. For example, thermosetting resins such as epoxy resin, unsaturated polyester resin, vinyl ester resin, phenol resin, urethane acrylate, polyester acrylate, diallyl phthalate; heat such as nylon resin, polyether ketone resin, polyphenyl sulfone resin, polyimide resin A plastic resin is mentioned. These resins may be used alone or in combination of two or more. Among these, thermosetting resins such as unsaturated polyester resins, vinyl ester resins, and epoxy resins are preferable.

  Known additives can be appropriately used as additives to be added to the matrix resin composition. Specific examples include fillers, curing agents, mold release agents, colorants and the like.

  In the fiber reinforced resin (100% by volume) according to the present invention, the reinforcing fiber content is preferably 30 to 80% by volume, more preferably 40 to 70% by volume, and still more preferably 45 to 65% by volume. By setting the content of the reinforcing fiber to be equal to or higher than the lower limit of the above range, good tensile strength and bending strength in the protective fence can be obtained. By setting it to the upper limit of the above range or less, the quantitative balance between the reinforcing fiber and the matrix resin composition is improved, and good moldability, tensile strength and bending strength can be obtained.

[Production method]
The method for producing a protective fence by curing a fiber reinforced resin can be produced by a molding method including a step of impregnating a matrix resin composition into a reinforcing fiber, molding the matrix resin composition into a desired shape, and curing the matrix resin composition. Specific molding methods include hand lay-up molding, resin injection molding, filament winding molding, pultrusion molding, press molding, extrusion molding, injection molding, infusion molding, and sheet winding molding. Law. Among these, the filament winding molding method, the sheet winding molding method, and the pultrusion molding method are preferable from the viewpoint of good productivity, and the pultrusion molding method is particularly preferable from the viewpoint of continuous molding.

  When manufacturing by a pultrusion molding method, specifically, these fibers are impregnated with the matrix resin composition by passing through the matrix resin composition while pulling the hard-cut fibers and the glass fibers at a predetermined speed. Subsequently, the difficult-to-cut fibers and glass fibers impregnated with the matrix resin composition are introduced into a heat-molding mold together with the nonwoven fabric, and the matrix resin is cured while passing through the mold. At this time, in the cross section perpendicular to the traveling direction in the thermoforming mold, the guide is placed so that the periphery of the reinforcing fibers (hardly cut fibers and glass fibers) impregnated with the matrix resin composition is surrounded by the nonwoven fabric. Used to guide the reinforcing fiber and the non-woven fabric into the heating mold.

  In the thermoforming mold, the matrix resin composition is cured in a state where the matrix resin composition is also impregnated into the nonwoven fabric to form a long cured product. The cured product is continuously pulled out by a pulling device. The obtained long cured product is cut to form a protective fence.

  The protective fence 10 of this embodiment includes a core material cured after impregnating a reinforcing fiber with a matrix resin composition, and a surface layer cured after impregnating the nonwoven resin with a matrix resin composition. Therefore, it is superior in corrosion resistance compared to a metal protective fence. Moreover, since the reinforcing fiber which comprises the core material contains the difficult-to-cut fiber, it is hard to be cut | disconnected with a blade. For example, it has better cutting resistance than a conventional protective fence made of glass fiber reinforced plastic. Preferably, it is possible to realize a protective fence whose time required for cutting with a saw is twice or more as compared with a conventional protective fence made of glass fiber reinforced plastic. Therefore, it is possible to provide a high-performance protective fence that is excellent in corrosion resistance and can prevent cutting with a blade.

  In particular, when non-metallic fibers such as aramid fibers are used as hard-to-cut fibers, radio interference is unlikely to occur, and therefore, it is suitable for a protective fence provided around an airfield.

  In addition, in embodiment, although the protective fence 10 used as an airport fence was demonstrated, a use is not limited to this, It can apply also as a protective fence surrounding other facilities, such as a park and a stadium. .

The perspective view which showed an example of the protection fence which concerns on embodiment Assembly perspective view of the guard fence shown in FIG. The principal part expanded sectional view of the guard fence shown in FIG. 1 is an enlarged perspective view of the support fence shown in FIG. Explanatory drawing of vertical cracks in a conventional protective fence post

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Guard fence, 12 ... Base, 14 ... Post, 16 ... Trunk edge, 18 ... Insertion hole, 20 ... Lattice, 22 ... Insertion hole, 24 ... Trunk joint, 26 ... Creeping part, 28 ... Shinobi, 30 ... Buried material

Claims (3)

In a protective fence comprising a plurality of cylindrical pillars erected in the vertical direction and a plurality of trunk edges bridged horizontally between the plurality of pillars,
A plurality of connection holes for connecting the trunk edge to the support column are formed in the support column along the support column, and at least the connection hole located at the lowest part of the plurality of connection holes and the lower opening of the support column A protective fence characterized in that a hollow portion between the ends is filled with a buried member to form a solid shape.   The protective fence according to claim 1, wherein the embedded member is embedded so as to be flush with a lower end edge of the connection hole in the horizontal direction.   The protective fence according to claim 1, wherein the embedded member is a foam having closed cells.

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