JP2007247227A - Soundproof wall - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a soundproof wall which facilitates lifting-up/down work during construction, contributes to the saving of labor during the construction, facilitates the attachment/detachment thereof, and is applicable to arrangement along a railroad line or a road. <P>SOLUTION: The soundproof wall is formed of fiber reinforced plastic. The soundproof wall has a projected upper edge, and therefore when lifted up by construction clamps 3, the soundproof wall can be safely hooked by the clamps. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a soundproof wall provided along a railway line or road that can be easily attached and detached.

  Conventionally, for example, concrete or metal soundproof walls have been installed mainly on the flat ground and elevated parts of railways and roads for the purpose of mitigating noise to local residents along the line. Since these materials are relatively heavy, the principle of sound insulation due to the large mass has given a certain effect in the prevention and diffusion of noise generated from railway vehicles and automobiles. As is well known in the art, the reinforced reinforcing bars are rusted and expanded due to the neutralization of the concrete, and there is a risk that the concrete surface will crack and peel off.

  Recently, an FRP (reinforced fiber reinforced plastic) product is known as an anti-peeling (for example, Patent Document 1). Unlike the conventional concrete and asbestos type soundproof walls, the soundproof wall material is made of FRP, so that it has advantages such as light weight and high strength characteristics, high strength, and excellent workability.

However, the FRP soundproof wall has many advantages such as light weight, high strength, design, and workability compared to the conventional concrete soundproof wall. When a construction clamp having a protrusion on the sandwiching surface used on the wall is used, the FRP surface is soft, so that there is a drawback that the surface is damaged. In addition, when a construction clamp having no projection on the sandwiched surface was used, it became slippery and there was a risk of dropping. In order to solve these problems, there is a known method of embedding lifting bolts and nuts in FRP sound barriers, inserting hanging bolts, etc., and hooking them to lift them. Therefore, it takes time and effort to insert and remove the suspension bolt, and it is necessary to take measures such as filling the bolt and nut hole with caulking after the construction.
JP 2002-087721 A

  In view of the background of such prior art, the present invention is easy and easy to suspend and suspend during construction, saves labor during construction, and has a soundproof wall attached to a railway line or road that is easy to install and remove. It is to be provided.

  According to the present invention, by providing the hook portion formed in a shape in which the upper end portion of the soundproof wall is bulged in a convex shape, it is possible to prevent drooping of raindrops, so that the design of the wall surface due to such raindrops can be prevented. There is also an advantage that a decline in sex can be prevented.

  In order to solve the above problems, the present invention employs the following means. That is, the soundproof wall according to the present invention is characterized in that at least a soundproof wall made of FRP is provided with a hooking portion that is formed in a shape in which the upper end portion of the soundproof wall is inflated in a convex shape, and is hooked at the time of lifting. To do.

The preferable aspect of this soundproof wall is as follows.
(1) The height of the cross section of the convex hook portion is 3 mm to 30 mm.
(2) The cross-sectional shape of the convex hook portion is any one of a triangle, a rectangle, a trapezoid, and a circle.
(3) The soundproof wall is formed of a two-layer structure including an outer frame and a core material.
(4) The constituent material is a reinforcing fiber resin in which the outer frame contains at least 5% to 70% by weight of reinforcing fibers made of inorganic fibers and / or organic fibers.
(5) The core material contains at least one filler selected from the group consisting of inorganic foam, organic foam, dried sludge, incineration ash, or honeycomb material.
(6) The said inorganic fiber contains both or any one of glass fiber and carbon fiber.
(7) The organic fiber includes at least one organic fiber selected from the group consisting of an aramid fiber, a polyamide fiber, and a polyester fiber.

  According to the present invention, since the work for lifting and lowering the soundproof wall during construction is extremely simple and easy, it is possible to simplify the installation and removal while saving labor during construction. Furthermore, since the surface design can be prevented from being deteriorated due to raindrops over a long period of time, the maintenance cost can be reduced.

  In the present invention, the above-described problem, that is, the work of lifting and suspending at the time of construction is simple and easy, and the labor at the time of construction can be saved. Then, in a normal FRP soundproof wall, the upper end of the wall is bulged into a convex shape and formed into a shape that can be easily hooked, that is, when a hooking portion is provided, it has been found that this problem can be solved all at once. It is.

  In particular, if the shape of the hooked portion is triangular and / or trapezoidal, and furthermore, a roof type, that is, a shape of a U-shape or a U-shape, it is effective for preventing dripping and preventing deterioration of the surface design. It has been clarified that can be done.

  Hereinafter, an example of the best mode of the present invention will be described with reference to the drawings of the examples.

  FRP sound barriers are known for their many advantages, such as light weight, high strength, and surface design. However, when suspended during construction, the FRP sound barrier is conventionally used as a sandwich surface used for concrete sound barriers. Because it is easy to slip because of the use of construction clamps with protrusions, etc., there is a risk of dropping, so it is necessary to insert and remove bolts each time a lifting bolt nut is attached. In addition, there is a problem in that it takes too much time and effort to fill the bolt and nut hole with caulking even after construction. Therefore, the present inventors diligently studied the form of the conventional FRP soundproof wall and tried to make it a specific form as described above.

  FIG. 1 is an overall perspective view of an FRP soundproof wall 1 according to an embodiment of the present invention. FIG. 2 is a diagram illustrating an example of a lifting state during the construction.

  In FIG. 1, the soundproof wall 1 of the present invention is formed in a shape in which the upper end portion of the soundproof wall 1 is inflated in a convex shape, that is, provided with a hooking portion for hooking when it is lifted. The hook portion has a continuous convex cross section on both sides.

The soundproof wall 1 is lifted by being sandwiched between the construction clamps 3. However, since the cross-sectional portion 2 that is convex as the hooked portion acts as a slip stopper for the construction clamps, it can be lifted safely. The convex hook portion preferably has a cross-sectional height of 3 mm to 30 mm. If the height of the cross section is 3 mm or more, it is preferable because it is difficult to come out even if the position when sandwiched between the construction clamps 3 is slightly shifted, and for this reason, 30 mm is sufficient.
As shown in FIGS. 3 and 4, the section of the section 2 provided on the soundproof wall 1 of the present invention and projecting as the hooking section may be a square section or a circular section. However, a triangular cross section and / or a trapezoidal cross section as shown in FIGS. 5 and 6 is more preferable because rainwater can be cut. In particular, the roof type, that is, the shape of a round shape or a square shape, is further excellent in the effect of preventing rain and is preferable from the viewpoint of preventing the deterioration of the surface design.

  Moreover, the convex cross-sectional part 2 may be convex on both sides, or may be convex on one side. Moreover, it may be convex over the entire width, or it may be halfway.

  The soundproof wall 1 of the present invention may have a single-plate structure, but more preferably, a two-layer structure, that is, a composite structure composed of the outer frame 4 and the core material 5 is used for strength. It is good from the viewpoint of durability, and furthermore, the wall part and the cross-sectional part 2 that protrudes as a hook part may be separately molded and joined and bonded, but from the viewpoint of strength and durability, These are preferably integrally molded.

  In particular, the outer frame 4 of the convex cross-sectional portion 2 as the hook portion needs to have a stable strength that can withstand lifting during construction, and also needs long-term durability, and thus is made by an integral molding method. It is desirable that In order to obtain such strength and long-term durability, it is preferable to use FRP containing reinforcing fibers composed of inorganic fibers and / or organic fibers, which will be described later, as the constituent material, and the content of the reinforcing fibers is at least by weight content. 5% to 70% is preferable. When the content is 5% or more, it is preferable because the reinforcing effect is greatly improved. In a high content region, there is a concern about a decrease in formability, but when it is 70% or less, a problem may occur from the viewpoint of formability. This is because there is not. 3 to 6 show examples of the two-layer structure of the soundproof wall 1 of the present invention.

  The core material 5 in such a two-layer structure serves as a spacer for ensuring bending rigidity, and may be anything as long as it is lightweight. For example, organic foams such as urethane foam and polyethylene foam, silicic acid, etc. It is preferable to use at least one filler selected from the group consisting of inorganic foams such as calcium and foamed concrete, wood, dried sludge, incinerated ash, and honeycomb material.

  Further, the reinforcing fiber constituting the FRP used for the outer frame 4 can be appropriately selected according to the use and use conditions. However, inorganic fiber made of glass, carbon fiber, aramid, polyamide, polyester, etc. Organic fibers such as fibers can be used. Moreover, as a form of the fiber to be used, for example, a short fiber having a fiber length of 1 to 50 mm, a mat (felt), a cloth made of continuous fiber, a strand, or the like can be preferably used.

  Here, in order to obtain light weight and high strength FRP, carbon fiber is most preferable, but in order to balance with cost, the one constituted by a glass fiber / carbon fiber hybrid is more preferable. That is, by blending and combining such carbon fibers, the vibration damping property is improved, so that it is possible to provide a soundproof wall 1 particularly suitable for use in a railway viaduct. Further, any carbon fiber may be used in consideration of the high strength and rigidity of the carbon fiber, but it is most preferable to use a so-called large tow carbon fiber for further cost reduction. Specifically, the number of filaments of one carbon fiber yarn may be less than the usual 10,000, but more preferably in the range of 10,000 to 300,000, particularly preferably 50,000 to 150. The use of tow-like carbon fiber filament yarns in the range of 1,000 is better in terms of resin impregnation property, handling property as a reinforcing fiber substrate, and economical efficiency of the reinforcing fiber substrate. Further, if necessary or according to required mechanical properties, a reinforcing fiber base can be formed by laminating a plurality of layers of reinforcing fibers, and the reinforcing fiber base can be impregnated with a resin. . In the reinforcing fiber layer to be laminated, a fiber layer or a woven fabric layer aligned in one direction can be appropriately laminated, and the fiber orientation direction can also be appropriately selected according to the required direction of strength.

  In addition, organic fibers such as aramid fiber, polyamide fiber, and polyester fiber have a greater elongation at break than inorganic fibers. Therefore, by selecting organic fibers for all or part of the reinforcing fibers, if broken, the fragments are strengthened. It can be preferably applied because it can be absorbed by the elongation of the fiber and prevented from scattering.

  Next, examples of the matrix resin constituting the FRP include thermoplastic resins such as polyethylene, polypropylene, nylon, ABS resin, PEEK (polyetheretherketone), polyimide, epoxy resin, unsaturated polyester resin, and vinyl ester. Thermosetting resins such as resins and phenol resins can be used. In the resin, layered compounds (for example, mica, molybdenum disulfide, boron nitride, etc.), acicular compounds (for example, zonotlite, potassium titanate, carbon fiber, etc.), granular and plate-like compounds (for example, ferrite, talc, By adding fillers such as clay), it is converted into frictional heat due to the mutual movement of inorganic crystals or between the inorganic substance and the matrix, and by filling such fillers, the elastic modulus and density are increased. There is an advantage that the resistance to vibration is increased and the effect of improving the damping characteristics is brought about, and the resonance of the soundproof panel itself due to vibration of the viaduct during train operation or vibration on the road bridge girder can be reduced.

  For example, it is preferable to add an inorganic flame retardant such as aluminum hydroxide or a flame retardant such as phosphorus, bromine or chlorine, since the flame retardancy can be improved. Of these, phenol resins are preferably used because they are excellent in flame retardancy and are inexpensive.

  In particular, when a phenol resin is used, excellent fire resistance is obtained, which is preferable. These additives are not necessarily required because the matrix resin itself has some vibration suppression and self-extinguishing (flame retardant) functions, but the place where it is attached, that is, to prevent the spread of fire due to fire, has a significant vibration propagation. However, it is better to select and adopt as appropriate according to the situation.

  The soundproof wall 1 made of FRP is made of a matrix resin or a reinforcing fiber, depending on vacuum, blow, injection, stamping, BMC (Bulk Molding Compounds), SMC (Sheet Molding Compounds), transfer, and RTM (Resin Transfer). Molding), pressing, drawing, hand lay-up molding, and various other molding methods can be used to form the film easily.

  The former is often used in combination of a short fiber substrate and a thermoplastic resin or a thermosetting resin. Although the strength and rigidity are slightly low due to the short fiber, the molding cycle is short and the manufacturing cost is short. Is a method that is often used because it is inexpensive and can easily form reinforcing ribs and the like having a function as a structure, and is superior in strength and rigidity to a single plastic. Suitable for structure.

  The latter is often used in a combination of a long fiber base material and a thermosetting resin, and it is possible to form reinforcing ribs as described above. In particular, vacuum injection impregnation molding, which is a simple RTM, has the advantage that the volume content of the reinforcing fiber substrate can be increased, and a material having high strength and rigidity can be produced at a relatively low cost.

It is the whole soundproof wall perspective view concerning one embodiment of the present invention. It is a whole perspective view which shows the construction lifting state of the soundproof wall which concerns on one embodiment of this invention. It is a vertical direction sectional view of a soundproof wall in another embodiment of the present invention. It is a vertical direction sectional view of a soundproof wall in another embodiment of the present invention. It is a vertical direction sectional view of a soundproof wall in another embodiment of the present invention. It is a vertical direction sectional view of a soundproof wall in another embodiment of the present invention.

Explanation of symbols

1: Soundproof wall 2: Convex cross section 3: Construction clamp 4: Convex cross section outer frame 5: Convex cross section core material

Claims (8)

A soundproof wall characterized in that at least a soundproof wall made of FRP is provided with a hook portion that is formed in a shape in which an upper end portion of the soundproof wall is bulged in a convex shape, and is hooked at the time of lifting. The soundproof wall according to claim 1, wherein a height of a cross section of the convex hook portion is 3 mm to 30 mm. The soundproof wall according to claim 1 or 2, wherein a shape of a cross section of the convex hook portion is any one of a triangle, a rectangle, a trapezoid, and a circle. The soundproof wall according to any one of claims 1 to 3, wherein the soundproof wall is formed of a two-layer structure including an outer frame and a core material. 5. The soundproofing according to claim 4, wherein the outer frame is made of FRP containing at least 5% to 70% by weight of reinforcing fibers made of inorganic fibers and / or organic fibers. wall. 6. The core material according to claim 5, wherein the core material contains at least one filler selected from the group consisting of inorganic foam, organic foam, dried sludge, incinerated ash, or honeycomb material. Soundproof wall. The soundproof wall according to claim 5 or 6, wherein the inorganic fibers include one or both of glass fibers and carbon fibers. The soundproof wall according to claim 5 or 6, wherein the organic fiber includes at least one organic fiber selected from the group consisting of an aramid fiber, a polyamide fiber, and a polyester fiber.

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