Inspection route

Abstract

To provide an inspection route capable of supporting a long support span without an increase in self-weight and with suppressed deflection, and allowing processes of assembly work to be reduced.SOLUTION: An inspection route is arranged with handrails 2 installed on both side edges of a slab 1 in a longitudinal direction, each of the slab 1 and the handrails 2 being made of resin. The slab 1 is an integrally molded product in a hollow shape in which a cavity 13 penetrating both ends in the longitudinal direction is formed, and has a rib 12 extending in the longitudinal direction between side walls 11 on both sides. The handrails 2 form a truss structure by fixing a plurality of columns 21 on the slab 1 in an upright state at both end parts and an intermediate part in the longitudinal direction, fixing a head piece 22 over upper end parts of the columns 21, and further fixing inclined members 23 to the columns 21 so as to connect the side walls 11 of the slab 1 and the head piece 22.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an inspection road used for maintenance and inspection of bridges. [Background technology]

[0002] Generally, highway and railway bridges are equipped with inspection tracks for periodic inspections and repairs of damaged sections. Traditionally, these inspection tracks were often made of steel, but in recent years, fiber reinforced plastic (FRP) tracks, which are lighter than steel and have superior durability and corrosion resistance, are increasingly being used.

[0003] As such an inspection road, Patent Document 1 listed below describes one in which balustrade units 52 are erected along both side edges of a deck slab 51, as shown in Figure 4, and the deck slab 51 and balustrade units 52 are each made of FRP members.

[0004] The deck 51 of the inspection road is constructed by placing and fixing a skin plate 62 on the top surface of a lattice-shaped grating 61 made up of vertical and horizontal members intersecting each other, and by providing lower chord members 63 on both sides of the skin plate 62.

[0005] The balustrade unit 52 is also composed of terminal supports 71 that stand upright at the four corners of the deck slab 51, fascia boards 72 that are fixed across the upper ends of the terminal supports 71 at both ends, lower chord members 73 that are fixed across the lower ends of the terminal supports 71 at both ends, inclined diagonal members 74 that connect the lower chord members 73 and fascia boards 72, and a center crosspiece 75 that extends longitudinally of the deck slab 51 at the middle part in the height direction.

[0006] The diagonal members 74 of the balustrade unit 52 have their upper and lower ends fixed to the coping board 72 and the lower chord 73, respectively, and the coping board 72, the lower chord 73 and the diagonal members 74 form a truss structure, and the middle crosspiece 75 is not considered a structural member that contributes to the strength of the truss structure. The deck slab 51 and the balustrade unit 52 are fixed by fastening the lower chord 63 of the deck slab 51 to the terminal struts 71 and the lower chord 73 of the balustrade unit 52 with fastening members such as bolts. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Patent No. 6238632 Summary of the Invention [Problem to be solved by the invention]

[0008] Incidentally, in the inspection road described in Patent Document 1, in order to ensure strength against bending, a lattice-like grating 61 is used as the core material of the deck slab 51, and this is combined with a skin plate 62 and a lower chord member 63 to form the deck slab 51. As a result, there is a problem that the weight increases as the support span becomes longer, and the applicable support span is limited to those that are relatively short.

[0009] In addition, the balustrade unit 52 itself forms a truss structure, with the lower chord 63 of the deck slab 51 and the lower chord 73 of the balustrade unit 52 arranged parallel to each other, one above the other. Therefore, when assembling the balustrade unit 52, it is necessary to fix the deck slab 51 and the balustrade unit 52 in addition to forming the truss structure of the balustrade unit 52, which is time-consuming.

[0010] Therefore, the present invention aims to provide an inspection path that can suppress deflection, accommodate long support spans, and reduce the number of assembly steps, without increasing its own weight, which would undermine the advantages of being made of resin. [Means for solving the problem]

[0011] In order to solve the above problem, the present invention provides an inspection road in which balustrades are erected along both longitudinal edges of a deck slab, and the deck slab and the balustrades are each made of resin, The deck slab is a hollow, one-piece molded product having a rib extending in the longitudinal direction between both side walls and a cavity penetrating to both ends in the longitudinal direction, The balustrade consists of multiple pillars fixed upright at intervals at both ends and the middle of the deck slab in the longitudinal direction, with a fascia board stretched across and fixed to the upper ends of the pillars, and diagonal members inclined relative to the pillars connecting the side walls of the deck slab to the fascia board to form a truss structure.

[0012] In addition, the fixing portion between the side wall of the deck slab and the diagonal member is adjacent to the fixing portion between the side wall of the deck slab and the support column.

[0013] Furthermore, the support posts, the fascia boards and the diagonal members are made of resin molding material having the same shape and size in cross section perpendicular to the longitudinal direction.

[0014] In addition, the balustrade is provided with a middle slat extending longitudinally at the midpoint between the deck slab and the fascia, and the middle slat is fixed to the support but is not supported by the diagonal member.

[0015] Furthermore, the number of columns arranged per unit length of the deck slab is greater near both ends in the longitudinal direction of the deck slab than in the middle.

[0016] Furthermore, at least one of the fixing portions between the side wall of the deck slab and the diagonal member and the fixing portion between the fascia and the diagonal member has a plurality of fastening members used for fixing the diagonal member, which are distributed on both sides of the central axis in the width direction extending in the longitudinal direction of the diagonal member, and are arranged offset in the longitudinal direction of the diagonal member.

[0017] The support span of the deck is 10 m or more, the pillars are erected at both ends and the middle of the deck in the longitudinal direction, and the fascia extends across the pillars located at both ends of the deck in the longitudinal direction. [Effects of the Invention]

[0018] The inspection road of this invention has a deck slab that is a hollow, one-piece molded product with ribs extending longitudinally inside and a cavity that runs through it, and a truss structure is formed by placing supports at both ends and the middle of the deck slab in the longitudinal direction and connecting the side walls of the deck slab to the fascia with diagonal members.This makes it possible to take advantage of the benefits of resin to create a rational structure that is lightweight and strong, reducing assembly labor while minimizing deflection and allowing for long support spans. [Brief explanation of the drawings]

[0019] [Figure 1] FIG. 1 is a perspective view showing an inspection path according to an embodiment of the present invention; [Figure 2] FIG. 10 is a side view showing the inspection path of the same [Figure 3] A longitudinal front view taken along line III-III in Figure 2 of the same. [Figure 4] A perspective view showing the inspection path described in Patent Document 1. DETAILED DESCRIPTION OF THE INVENTION

[0020] (overview) An embodiment of the present invention will be described below with reference to the accompanying drawings. The inspection road shown in Figure 1 has balustrades 2 erected along both longitudinal edges of a deck slab 1, and the deck slab 1 and balustrades 2 are both made of FRP. The support span of this inspection road is 12.5 m.

[0021] (Deck structure) As shown in Figures 1 and 3, the deck slab 1 is a hollow, one-piece molded product that has multiple ribs 12 extending longitudinally between side walls 11 on both sides, a cavity 13 that penetrates to both ends in the longitudinal direction, and a top wall 14 and a bottom wall 15 formed at the top and bottom, respectively. The surface of the top wall 14, which forms the surface on which workers walk during bridge maintenance and inspection, has a peak at the center of the width and slopes downward on both sides.

[0022] This deck 1 is manufactured by pultrusion molding. Pultrusion molding is a molding method in which a reinforcing base material such as glass fiber impregnated with resin is pulled into a mold, hardened into a predetermined cross-sectional shape within the mold, and then pulled out continuously or intermittently with a pultrusion device to cut to a predetermined length, obtaining a long molded product with the same cross section. Pultrusion molding efficiently aligns continuous long fibers, resulting in high strength and high rigidity.

[0023] (Configuration of the balustrade) As shown in Figures 2 and 3, the balustrade 2 is configured to form a truss structure in which multiple pillars 21 are fixed upright at intervals at both ends and the middle part of the deck slab 1 in the longitudinal direction, and a fascia 22 is fixed across the upper ends of the pillars 21 at both ends, and diagonal members 23 inclined relative to the pillars 21 are fixed to connect the side walls 11 of the deck slab 1 to the fascia 22.

[0024] The fixed portion of the side wall 11 of the deck slab 1 and the diagonal member 23 is adjacent to the fixed portion of the side wall 11 of the deck slab 1 and the support column 21, so that the support column 21 and the diagonal member 23 reinforce each other.

[0025] The number of columns 21 arranged per unit length of the deck slab 1 is greater near both ends in the longitudinal direction of the deck slab 1 than in the middle. This allows the deck slab 1 to withstand large shear forces acting on the ends, resulting in excellent load-bearing capacity.

[0026] The support posts 21, copings 22, and diagonal members 23 are made of resin molding material with the same cross-sectional shape and size perpendicular to the longitudinal direction. Specifically, channel material, which is a pultruded product with a U-shaped cross section, is used. The channel material is fixed to other members by fastening members at the web portion connecting the flanges on both sides.

[0027] Furthermore, the balustrade 2 is provided with a middle crosspiece 24 that extends longitudinally between the deck slab 1 and the coping 22, at the midpoint in the height direction. The middle crosspiece 24 is fixed to the support 21, but is not supported by the diagonal member 23, so as not to apply unexpected loads to the diagonal member 23. The middle crosspiece 24 is made of square pipe material that is a drawn product with a square cross section.

[0028] In addition, toe plates 25 are provided at the bottom of the balustrade 2 along the upper surfaces of both longitudinal edges of the deck 1 to prevent tools and parts used in bridge maintenance and inspection from falling. The toe plates 25 are thin, long, flat plates that are fixed to the supports 21.

[0029] (Fixed part of the component) Fastening members 3 consisting of bolts, nuts and washers are used to fasten the components together at the fixed portions between the side walls 11 of the deck slab 1 and the support columns 21, between the side walls 11 of the deck slab 1 and the diagonal members 23, between the fascia 22 and the support columns 21, between the fascia 22 and the diagonal members 23, between the middle crosspiece 24 and the support columns 21, and between the toe board 25 and the support columns 21.

[0030] 2, at the fixed portion between the side wall 11 of the deck slab 1 and the diagonal member 23 and at the fixed portion between the coping 22 and the diagonal member 23, two fastening members 3 are used for each of these fastenings, which are distributed to both sides of the central axis in the width direction extending in the longitudinal direction of the diagonal member 23, and are arranged offset in the longitudinal direction of the diagonal member 23. This is expected to further increase the strength of the fastening between the members.

[0031] Furthermore, if at least one of the fixing portions between the side wall 11 of the deck slab 1 and the diagonal member 23 and the fixing portion between the fascia 22 and the diagonal member 23 is made to have this fixing structure, the strength can be increased compared to when the two fastening members 3 used for fixing are positioned on the central axis in the width direction extending in the longitudinal direction of the diagonal member 23.

[0032] (effect) In the inspection road described above, the deck slab 1 is made into a hollow one-piece molded product having longitudinally extending ribs 12 inside and a through cavity 13, the lower ends of the pillars 21 are fixed to the side walls 11 of the deck slab 1, a fascia 22 is placed across the upper ends of the pillars 21, and the side walls 11 of the deck slab 1 and the fascia 22 are connected with diagonal members 23 to form a truss structure, so that the pillars 21 and diagonal members 23 have the effect of reinforcing each other, reducing deflection and enabling the structure to accommodate long support spans.

[0033] Furthermore, each component that makes up the deck slab 1 and the balustrade 2 is made from a pultrusion-molded product, and the columns 21, fascia 22, and diagonal members 23 that make up the truss structure are made from resin-molded material with the same cross-sectional shape and size perpendicular to the longitudinal direction. This makes it possible to take advantage of the advantages of FRP, such as light weight, high strength, high rigidity, durability, and corrosion resistance, while also significantly reducing manufacturing costs. [Explanation of symbols]

[0034] 1 floor slab 2 Railing 3 Fastening members 11 Side wall 12 Ribs 13 Cavity 14 Ceiling wall 15 Bottom Wall 21 Post 22 Kasagi 23 Diagonal 24 Center rail 25 Toe Board

Claims

1. In an inspection road in which balustrades (2) are erected along both longitudinal edges of a deck (1), and the deck (1) and the balustrades (2) are each made of resin, The deck (1) is a hollow, one-piece molded product having a rib (12) extending longitudinally between side walls (11) on both sides, and a cavity (13) penetrating through to both ends in the longitudinal direction. The balustrade (2) is characterized in that a plurality of posts (21) are fixed upright at intervals at both ends and the middle of the longitudinal direction of the deck slab (1), a fascia (22) is fixed across the upper ends of the posts (21), and diagonal members (23) inclined relative to the posts (21) connect the side walls (11) of the deck slab (1) and the fascia (22) to form a truss structure.

2. An inspection path as described in claim 1, characterized in that the fixed portion between the side wall (11) of the deck (1) and the diagonal member (23) is adjacent to the fixed portion between the side wall (11) of the deck (1) and the support (21).

3. 2. The inspection path according to claim 1, wherein the support (21), the coping (22) and the diagonal member (23) are made of a resin molding material having the same shape and size in cross section perpendicular to the longitudinal direction.

4. The inspection path described in claim 1, characterized in that the balustrade (2) has a middle crosspiece (24) extending longitudinally between the deck slab (1) and the fascia (22) at the midpoint in the height direction between them, and the middle crosspiece (24) is fixed to the support (21) but is not supported by the diagonal member (23).

5. An inspection path as described in claim 1, characterized in that the number of the pillars (21) arranged per unit length of the deck (1) is greater near both ends of the deck (1) in the longitudinal direction than in the middle.

6. An inspection path as described in claim 1, characterized in that at least one of the fixing portions between the side wall (11) of the deck slab (1) and the diagonal member (23) and the fixing portion between the fascia (22) and the diagonal member (23) has a plurality of fastening members (3) used for fixing the fixing portion distributed to both sides of the central axis in the width direction extending in the longitudinal direction of the diagonal member (23) and arranged offset in the longitudinal direction of the diagonal member (23).

7. An inspection path as described in claim 1, characterized in that the support span of the deck (1) is 10 m or more, the pillars (21) are erected at both longitudinal ends and the middle part of the deck (1), and the coping (22) extends across the pillars (21) located at both longitudinal ends of the deck (1).

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