JPH07158013A - Suspension bridge - Google Patents

Abstract

PURPOSE:To lighten the weight of a suspension bridge and improve its strength and durability as well. CONSTITUTION:A plurality of cross girders 2 are hung down from parallelling two main cables 1 through a hanger 1a suspended at specific intervals and a plurality of stringers 3 are fitted on these cross girders 2 crosswise at specific intervals, while a numerous footboards 4 are crossed over these stringers 3 and secured thereon mutually adjoining each other. The stringers 3 and footboards 4 of the suspension bridge thus constructed are made of an aluminum hollow extrusion molding shape material having a nearly square cross section.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a suspension bridge whose upper part is made of aluminum hollow extruded profile.

[0002]

2. Description of the Related Art As shown in FIG. 5, a girder made of H-shaped steel
Hanger (3) with the end of (31) hanging from the main cable (32)
Suspended by 3), a plurality of wooden vertical girders (joists) (34) are arranged on the horizontal girder (31) at predetermined intervals in a cross shape. ) And bolts (36) on the cross beam (31). And each vertical girder (34)
A large number of wooden walking boards (37) are arranged adjacent to each other across the
The walking board (37) is struck on the stringer (34) with nails (38).
Further, the balustrade parts (39) on both sides are framed by vertical and horizontal iron pipes (40) (41), and the wire mesh (4) is provided between the horizontal iron pipes (41) (41).
2) is stretched.

[0003]

In the conventional suspension bridge, the horizontal girder (31) and the balustrade (39) are made of iron, and the wooden vertical girder (3
4) and the walking board (37) are also thick in order to obtain a predetermined strength, the weight of the suspension bridge becomes heavy. Furthermore, as the walking board (37) wears out and the wooden cross beam (31) rots over the years, it is necessary to replace each of these members, but this repair work is not a major task. It is necessary to build a scaffold, and such repair work requires a great deal of time and money. Further, the iron balustrade (39) also has various problems such as rusting over time, impairing the appearance of the suspension bridge, and soiling the hands of pedestrians.

An object of the present invention is to provide a suspension bridge which is lightweight and has excellent strength and durability.

[0005]

According to the present invention, a plurality of cross girders are suspended in parallel from two parallel main cables via hangers that are hung at predetermined intervals, and a plurality of cross girders are hung on these cross girders. The vertical girders are attached in a cross shape at a predetermined interval,
In a suspension bridge in which a large number of walking boards are fixed to each other on these longitudinal girders, the longitudinal girders and the walking boards are made of an aluminum hollow extruded shape having a substantially rectangular cross section.

Further, in the suspension bridge according to the present invention, among the opposing side surfaces of the walking boards adjacent to each other, one side surface is provided with a ridge extending in the length direction of the walking board, and the other side surface is provided with a ridge. Corresponding recesses are provided.

Further, in the above suspension bridge of the present invention, ribs are provided on both side edges of the upper surface of each walking board, and anti-slip sheets are provided on the upper surface of each walking board between the ribs on both sides.

In the present invention, the term "aluminum" includes an aluminum alloy.

[0009]

In the suspension bridge of the present invention, since the upper girders and walking boards are made of aluminum hollow extruded profile, the suspension bridge weight can be significantly reduced and deterioration over time can be prevented. Sufficient suspension bridge strength can be obtained.

Further, among the opposite side surfaces of the walking boards adjacent to each other, one side surface is provided with a ridge extending in the length direction of the walking board, and the other side surface is provided with a concave portion corresponding to the ridge. In the suspension bridge according to the present invention, the ridges on the side surfaces of the walking boards have an effect of blocking the pedestrian's view below the bridge even when there is a slight gap between the adjacent walking boards.

Further, the anti-slip sheet provided on the upper surface of each walking board effectively prevents the pedestrian from slipping his / her foot.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a suspension bridge according to the present invention will be described with reference to the drawings.

As shown in FIGS. 1 to 4, in a suspension bridge, a large number of transverse girders (2) are arranged in parallel via two parallel main cables (1) via hangers (1a) suspended at predetermined intervals. A plurality of stringers (3) are mounted on these cross girders (2) at predetermined intervals in a crossed manner, and a large number of walking boards (4) are attached to each other on these stringers (3). It has been handed down next to it. Stringer
(3) and the walking board (4) are made of an aluminum hollow extruded shape having a substantially rectangular cross section, and the cross beam is made of H-shaped steel.

A ridge (5) extending in the length direction of the walking board on the upper half of one of the opposite side surfaces of the adjacent walking board (4).
However, the ridges (6) are also provided on the lower half of the other side, and the lower half without the ridges (5) on one side is the ridge on the other side. (6)
The upper half of the other side where the ridge (6) is not provided is the recess (8) corresponding to the ridge (5) on one side. .

Ribs (9) are provided on both side edges of the upper surface of each walking board (4), and a weatherproof anti-slip sheet (11) is provided on the upper surface of the walking board (4) between the ribs (9) on both sides. ) Is glued. As the non-slip sheet (11), a vinyl chloride sheet or a polyester sheet mixed with mineral particles is used. Further, these anti-slip sheets (11) have a thickness lower than the height of the ribs (9) when bonded to the upper surface of the walk board (4). Thereby, peeling of the sheet is prevented.

The walking board (4) has two hollow portions with a substantially rectangular cross section.
(4a) and upper and lower depressions formed between these hollow portions (4a)
(4b), and a through hole (4c) through which the mounting bolt (15) is inserted is formed between both recessed portions (4b). In this case, through hole (4c)
Even if the mounting bolt (15) is inserted from above and the walker (4) is fixed on the stringer (3), the head (15a) of the mounting bolt (15) is located inside the recess (4b). It is not housed and does not project above the walking board (4). In addition, when installing the walking board (4), if it is necessary to replace the walking board later, it is possible to replace the walking board (4) one by one, so there is a slight gap between the adjacent walking boards (4). (S) is opened. In addition, when mounting the walk board (4), a spacer is interposed between the central stringers of the plurality of stringers (3) to raise the central portion of the walk board (4) so that rainwater can walk. There may be slopes that run down to both ends of the plate.

The vertical girder (3) is fixed on the horizontal girder (2) by an L-shaped mounting bracket (16) and a connecting bolt (19).
The end portions of (3) are butted against each other on the upper surface of the horizontal girder (2) and are connected to each other through a connecting member (17) inserted in each vertical girder (3) in advance. Incidentally, reference numeral (18) in the drawing denotes a packing or coating film interposed between the L-shaped mounting member (16) and the vertical girder (3).

The balustrades (20) on both sides of the suspension bridge are composed of a pillar (12) standing upright on the end of the cross girder (2) and a handrail member (13) which is suspended on the pillar (12). ) And a surface lattice (14) mounted between columns (12), both made of aluminum.

According to the suspension bridge of the above embodiment, each stringer (3),
Since each walking board (4) is made of an aluminum hollow extruded shape and each component of the balustrade (20) is also made of aluminum, the weight of the entire suspension bridge is significantly reduced. Also, since there is a slight gap (S) between the adjacent walking boards (4), when the walking boards are replaced later, the walking boards are separated by the length of each stringer (3). (4) can be removed one by one and replaced. Therefore, it is possible to replace the walking board only by working at night without suspending the suspension bridge for a long time.

Further, the existing suspension bridge shown in FIG. 5 and having a wooden upper part can be easily converted into the suspension bridge according to the present invention of the above embodiment. Specifically, first, the parapet parts (3
From 9), with a rope etc., put a safety net just under the suspension bridge, after removing the existing wooden footboard (37), between the existing wooden longitudinal girders (34), the aluminum hollow extrusion according to the present invention. Placing stringers made of profiles and fixing them on the existing girders (31) in the same manner as in the above-mentioned example, as well as existing wooden girders (3
4) is removed. Then, the suspension bridge according to the present invention can be remodeled only by sequentially mounting the walking boards made of the aluminum hollow extrusion from one side of the suspension bridge in the same manner as in the above-mentioned embodiment.

In addition to the above, in the case of any modification or new construction of the suspension bridge of the present invention, it is easy to alumite-treat or appropriately coat the aluminum members used for the footboard, cross girder and balustrade. It can be adapted to the surrounding landscape.

In the above embodiment, the convex strips (5) (6) and the corresponding recesses (7) are formed on the opposite side surfaces of the adjacent walking boards.
Although (8) is provided, only the convex strip may be provided on one side surface and only the corresponding concave portion may be provided on the other side surface.

[0023]

Since the upper part of the suspension bridge of the present invention, that is, the longitudinal girder and the walking board is made of the aluminum hollow extruded shape, the weight of the entire suspension bridge is significantly reduced as compared with the conventional suspension bridge. Further, when the conventional wooden suspension bridge is deteriorated, the suspension bridge of the present invention can be easily modified. Further, since the suspension bridge of the present invention having an aluminum upper portion does not deteriorate significantly as in the conventional wooden suspension bridge, a large-scale repair work by assembling scaffolding is unnecessary.

Further, among the opposite side surfaces of the walking boards adjacent to each other, one side surface is provided with a convex strip extending in the length direction of the walking board, and the other side surface is provided with a concave portion corresponding to the convex strip. According to the suspension bridge of the present invention, even when a slight gap is provided between the adjacent walking boards in order to replace each walking board one by one when the walking boards are repaired, the ridges on the side surfaces of the walking boards are under the bridge of the pedestrian. Since it blocks the view of the other person, it is possible to prevent the pedestrian from feeling afraid.

Further, the anti-slip sheet provided on the upper surface of each walking board effectively prevents the pedestrian from slipping his / her foot.

[Brief description of drawings]

FIG. 1 is a partially enlarged perspective view of a suspension bridge according to the present invention.

FIG. 2 is a side view of the suspension bridge of the present invention.

FIG. 3 is a partially enlarged cross-sectional view showing an upper structure of the suspension bridge shown in FIG.

FIG. 4 is an enlarged transverse cross-sectional view of main parts showing an upper structure of the suspension bridge in FIG.

FIG. 5 is a partially enlarged perspective view showing a conventional example of a suspension bridge.

[Explanation of symbols]

 (1) Main cable (1a) Hanger (2) Horizontal girder (3) Vertical girder (4) Pedestrian

Claims (3)

[Claims] 1. A plurality of cross girders via a hanger (1a) suspended from a parallel two main cables (1) at predetermined intervals.
(2) are suspended in parallel, and a plurality of vertical girders (3) are mounted on these cross girders (2) at predetermined intervals in a crossed manner. In suspension bridges where (4) are suspended adjacent to each other, stringers (3) and footboards
(4) is a suspension bridge composed of an aluminum hollow extruded profile with a substantially rectangular cross section. 2. A ridge extending in the length direction of the walking board (4) is provided on one of the facing side surfaces of the walking boards (4) adjacent to each other, and the other side surface corresponds to the ridge. The suspension bridge according to claim 1, further comprising a recessed portion. 3. The walking board (4) is provided with ribs (9) on both side edges of the upper surface, and a slip prevention sheet (11) is provided on the upper surface of the walking board (4) between the ribs (9) on both sides. Claim 1 provided
Alternatively, the suspension bridge according to claim 2.