JP2018197458A - Fiber reinforced plastic walkway - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an FRP corridor in which the number of parts of a main girder is small and the strength of the main girder can be easily secured. SOLUTION: The main girder 1 is composed of a pillar 2 erected on both sides of the main girder 1 and a handrail 3 attached to the pillar 2, and the main girder 1, the pillar 2 and the handrail 3 are each formed of FRP. In the FRP corridor, the main girder 1 has a hollow plate shape consisting of a front surface portion 11, a back surface portion 12, and both side surface portions 13, and is located between the front surface portion 11 and the back surface portion 12 at a plurality of locations in the width direction. By using an integrally molded product having ribs 14 extending in the longitudinal direction, the number of parts of the main girder 1 can be reduced as compared with the case of using a main girder in which a plurality of parts are integrated, and the strength of the main girder 1 can be reduced. It was made possible to easily secure the. [Selection diagram] FIG. 4

Description

  The present invention relates to a fiber reinforced resin walkway used for inspection roads and the like for performing maintenance and inspection of bridges.

  Highway and railway bridges are generally provided with inspection paths for periodic inspections and repairs of damaged parts. Many of the walkways that make up this inspection path have been made of steel in the past, but in recent years, the weight can be significantly reduced compared to that of steel, making installation work easier and even without surface treatment. Products made of fiber reinforced resin (FRP) that can ensure durability and corrosion resistance have been used.

  The fiber reinforced resin walkway (hereinafter also referred to as “FRP walkway”) as described above is usually a main girder, pillars erected at a plurality of positions in the longitudinal direction of the main girder, and the longitudinal direction of the main girder. The main girder, the support column, and the handrail are each formed of FRP. And the main girder has many what integrated several FRP components.

  For example, a main girder (deck plate) of a corridor (bridge inspection road structure) disclosed in Patent Document 1 includes a back plate, a front plate, and a U-shaped cross-section that forms the left and right side surfaces. Each of the U-shaped cross sections disposed in the center in the width direction between the back plate and the front plate is formed of FRP, and the components are joined with an adhesive.

  Further, in Patent Document 2, as a main girder (scaffold plate) of a walkway used for inspection and repair of a structure, a plurality of rectangular FRP pipes are arranged, and FRP plates are laminated on the upper and lower surfaces thereof, It is disclosed to use a plate-like body in which the outer periphery is wound with resin-impregnated fibers and the outermost periphery is covered with a metal thin plate for preventing scratches.

Utility Model Registration No. 3128947 Japanese Patent No. 3367788

  However, in the FRP corridor as disclosed in Patent Documents 1 and 2 above, since the number of parts of the main girder is large, the parts management until the production of the main girder becomes complicated, and parts are also produced at the time of main girder production There is a problem that it takes time and labor to integrate. Moreover, because the main girder parts are bonded together (Patent Document 1) or wrapped with resin-impregnated fibers (Patent Document 2), they are integrated so that the main girder maintains its integrated state during production. It is necessary to carefully design and manufacture the main girder so that it cannot be deformed or damaged, and it takes time and effort to design and manufacture.

  Accordingly, an object of the present invention is to provide an FRP pedestrian walkway in which the number of parts of a main girder is small and the strength of the main girder can be easily secured.

  In order to solve the above-described problems, the present invention includes a main girder, a support column erected at a plurality of positions in the longitudinal direction of the main beam, and a handrail attached to the support column in a state extending in the longitudinal direction of the main beam. A fiber reinforced resin walkway (FRP walkway) in which at least the main girder is formed of a fiber reinforced resin, the main girder has a hollow plate shape including a front surface portion, a back surface portion, and both side surface portions. The configuration is an integrally molded product having a rib extending in the longitudinal direction between the front surface portion and the back surface portion in at least one place in the width direction.

  In other words, as a main girder made of FRP, the number of parts of the main girder is reduced by using a hollow plate-like integrally molded product having a rib inside, as compared with the case where a main girder in which a plurality of parts are integrated is used. The strength of the main girder as a whole can be easily secured.

  Here, the support column is fastened to the side portion of the main girder by a fastening member, and the main girder is provided with an opening at least in the vicinity of the fastening portion between the side surface portion and the support column of the back surface portion. If the structure which is used is employ | adopted, the fastening operation | work to the main girder side part of a support | pillar will become easy.

  Further, when the surface portion of the main girder is configured to have a slope that has the center in the width direction of the surface as a vertex and descends toward both sides in the width direction, when this FRP walkway is installed outdoors, Rainwater or the like slides down on both sides in the width direction without remaining on the main girder, so that it is difficult for the operator to slide his / her foot on the main girder.

  As described above, the FRP corridor of the present invention uses a hollow plate-like integrally formed product having ribs inside as an FRP main beam. Compared to the one used, the number of parts of the main girder is small, and it is easy to ensure the strength of the main girder.

Side view of FRP walkway of embodiment Front view of the FRP walkway in FIG. a is an enlarged longitudinal sectional view showing the vicinity of the main girder of the cross section along the line III-III in FIG. The perspective view which looked at the vicinity of the section of Drawing 3 from the lower part A longitudinal sectional view showing a modification of the main girder corresponding to FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIGS. 1 and 2, the FRP walkway includes a main girder 1, pillars 2 erected on both sides of the main girder 1 at a plurality of positions in the longitudinal direction of the main girder 1, and the length of the main girder 1. The main girder 1, each column 2, and each handrail 3 are each formed of fiber reinforced resin (FRP).

  As shown in FIGS. 2, 3 (a) and 4, the main girder 1 has a hollow plate shape composed of a front surface portion 11, a back surface portion 12, and both side surface portions 13, 13, and a plurality of them in the width direction. It is an integrally molded product having ribs 14 extending in the longitudinal direction between the front surface portion 11 and the back surface portion 12 at a location, and is manufactured by pultrusion molding. Here, the pultrusion molding is a molding method suitable for arranging reinforcing fibers in the longitudinal direction and expresses a large strength in the longitudinal direction. Therefore, the main girder 1 also has a large strength in the longitudinal direction. Yes. Further, as shown in FIGS. 3A and 3B, the surface portion 11 of the main girder 1 has a slope of an angle θ with the center in the width direction of the surface as the apex and descending toward both sides in the width direction. Yes.

  As shown in FIGS. 1 to 4, each support column 2 is a member having an L-shaped cross section composed of two strip portions 21, 22, and the lower end portion of the outer surface of one strip portion 21 is the main girder 1. The main girder side surface portion 13 is fastened by a fastening member 4 composed of a bolt and a nut while being in contact with the side surface portion 13.

  Then, as shown in FIGS. 3A and 4, a rectangular opening 15 is provided in the back surface portion 12 of the main beam 1 in the vicinity of the fastening portion between the side surface portion 13 of the main beam 1 and each column 2. The opening 15 can be used to fasten the column 2 to the main girder side surface portion 13.

  As shown in FIGS. 1, 2, and 4, each handrail 3 is a round pipe-like member, and is orthogonal to the other (main girder side surface portion 13) of the plurality of columns 2 arranged in the longitudinal direction of the main girder 1. Three stages (upper, middle and lower stages) are arranged in the vertical direction in a state of penetrating the belt-like part 22. Among them, the upper handrail 3 has a larger diameter than that of the middle and lower handrails 3 in order to ensure rigidity, and is fixed to the support post 2 by a fixing tool 5 before and after each support post 2 penetrating position. ing. On the other hand, the middle and lower handrails 3 are fixed to the support columns 2 arranged at both ends in the longitudinal direction of the main girder 1 with the fixtures 5 at the front and rear of the penetration positions of the support columns 2.

  This FRP walkway has the above-described configuration, and uses a hollow plate-like integrally formed product having ribs 14 as the FRP main beam 1, so that a main beam in which a plurality of parts are integrated is used. The number of parts in the main girder is smaller than the conventional one. Therefore, the main girder 1 does not require parts management until production, and the production only needs to be performed once, and time and labor are not required. In addition, since the structure and the manufacturing process are relatively simple, it is easy to manage at the design and manufacturing stage to ensure strength, and in this respect, the productivity is excellent.

  Further, since the surface portion 11 of the main girder 1 has a slope that is centered in the width direction of the surface and descends toward both sides in the width direction, when this FRP corridor is installed outdoors, rainwater, etc. Does not remain on the main girder 1 and slides down on both sides in the width direction so that the operator can hardly slide his / her foot on the main girder 1.

  Further, the column 2 is a member having an L-shaped cross section, and the lower end portion of the outer side surface of one band-like portion 21 is brought into contact with the main girder side surface portion 13 and fastened with a fastening member 4 made of a bolt and a nut. In addition, since the opening 15 is provided in the vicinity of the fastening portion between the main girder side surface portion 13 and each support column 2 in the back surface portion 12 of the main girder 1, the fastening operation to the main girder side surface portion 13 of the support column 2 is performed. In addition to being easy, the weight can be reduced as compared with the case of using a column having a rectangular cross section.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the meanings described above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  For example, the main girder 1 may be one having a height higher than that of the above-described embodiment as in the modification shown in FIG. Further, the surface portion may be provided with a gradient as in the embodiment for preventing slipping, and the surface may be applied with antislip coating.

  And in embodiment, although the opening 15 for facilitating the fastening operation | work to the main girder side part 13 of the support | pillar 2 was provided in the back surface part 12 of the main girder 1, the opening is a slit covering the full length direction of a main girder. It can also be formed into a shape. If the opening is formed in a slit shape, the main girder can be manufactured more efficiently because it is formed at the same time as the main girder is drawn. On the other hand, when providing an individual opening as in the embodiment, for reinforcement of the main girder, the opening may be closed after the fastening work to the main girder of the support is completed, or a lid for opening and closing the opening is provided. You may make it attach.

  Moreover, although it is preferable to use a member having an L-shaped cross section as in the embodiment, the strut may be a member having an H-shaped cross section or a member having a rectangular cross section.

  In the embodiment, the handrail is made of FRP in all three stages, but only the upper stage may be made of metal such as steel. If the upper handrail is made of a material having rigidity higher than that of FRP, the deflection of the handrail is reduced compared to the case where the handrail is made of FRP as in the embodiment, so that the number of support pillars can be reduced. It is possible to reduce the load of fastening work to the main girder. In the embodiment, the middle stage and the lower stage of the three stages are fixed only by the support columns at both ends in the longitudinal direction of the main girder. However, the middle and lower stages are fixed before and after all the column penetrating positions as in the upper stage. It may be.

  In addition, a fall prevention plate (toe plate) made of FRP for preventing the main girder from dropping from the main girder such as an instrument used for inspection or repair can be provided on the side of the main girder.

DESCRIPTION OF SYMBOLS 1 Main girder 2 Support | pillar 3 Handrail 4 Fastening member 5 Fixing tool 11 Front surface part 12 Back surface part 13 Side surface part 14 Rib 15 Opening 21 and 22 Band-shaped part

Claims (3)

A main girder, struts erected at a plurality of positions in the longitudinal direction of the main girder, and handrails attached to the struts in a state extending in the longitudinal direction of the main girder, wherein at least the main girder is made of fiber reinforced resin In the formed fiber-reinforced resin walkway,
The main girder has a hollow plate shape composed of a front surface portion, a back surface portion, and both side surface portions, and has a rib extending in the longitudinal direction between the front surface portion and the back surface portion in at least one position in the width direction. A fiber-reinforced resin walkway characterized by being an integrally molded product.   The support column is fastened to the side surface portion of the main girder by a fastening member, and the main girder is provided with an opening at least in the vicinity of the fastening portion between the side surface portion and the support column of the back surface portion. The fiber reinforced resin walkway according to claim 1, wherein the walkway is made of fiber reinforced resin.   3. The fiber-reinforced resin walkway according to claim 1, wherein the surface portion of the main girder has a slope that has the center in the width direction of the surface as a vertex and descends toward both sides in the width direction.

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