JPS6361441B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a track girder for a suspended monorail.

The track girder of a suspended monorail is supported by supports at intervals of about 25 to 35 m. It functions as a beam supported by the pillars, and transmits the monorail vehicle load carried between them to the pillars.

The conventional ones shown in FIGS. 1 and 2 both have rigid stiffening rings 1 arranged at a pitch of 2 to 2.5 m,
Transferring the running wheel load from the running rail 2 to the stiffening ring 1,
It is transmitted along a path from the stiffening ring 1 to the track girder to the strut, and each stiffening ring 1 is provided with a flange plate 3.

Conventional open cross-section beam theory starts from a cross-sectional stiffness theory with a rigid diaphragm or stiffening ring, and advances the analysis of the beam cross section, so the diaphragm or stiffening ring must be rigid. , Therefore, the load in running theory must be concentrated at the position of the stiffening ring. Therefore, there is a risk of damage due to fatigue due to repeated loads from high-frequency running, and the design, materials, manufacturing, and inspection of the stiffening ring portion are factors that increase costs. In addition, in the case shown in Fig. 1, the outer frame of the continuous section cross section is large, while in the case shown in Fig. 2, the rigid stiffening ring with the flange plate 3 is exposed on the outside, so the This gives a bad impression, spoiling the aesthetic appearance, and also causes an increase in weight.

The present invention has been made in view of the above-mentioned problems of the conventional ones, and the suspension link is inserted in the center of the track girder of a suspension monorail that forms the running surface of the bogie on which the vehicle is suspended via the suspension link. a pair of outer plate lower flanges 17 forming an opening;
The box is made up of an upper outer flange 11 facing the lower flange 17, and a pair of outer belly plates 12 which are fixed to both ends of the flanges and whose inner surfaces serve as guide surfaces for guide wheels regulating the direction of the truck. The upper surface of the outer plate lower flange 17 serves as the running surface for the running wheels of the bogie, and the vertical rib 16 projects directly downward from the lower surface and extends in the longitudinal direction of the track girder.
and a downwardly extended portion 13 of the skin belly plate 12 that protrudes downward from the skin lower flange 17 and extends parallel to the vertical rib 16, and is located on substantially the same horizontal plane as the skin lower flange 17. A pair of side ribs 14 are provided, each of which protrudes from the side surface of the outer skin plate 12 and extends in the longitudinal direction of the track girder, and the track girder According to the present invention, the present invention relates to a track girder for a suspended monorail, in which a plurality of plate-type stiffening plates 15 are arranged perpendicularly to the longitudinal direction of the track girder, separated by a predetermined interval in the longitudinal direction of the track girder. Since the plate-type stiffening plates 15 are arranged as described above, the cross-sectional rigidity is made uniform in the longitudinal direction of the track girder, and the running wheel load is reliably distributed. Moreover, by providing the side ribs 14 and the downward extension portion 13 to increase the out-of-plane rigidity against cross-sectional opening, the dispersion effect becomes extremely large, and the degree of stress concentration can be significantly reduced, thereby preventing fatigue damage. By improving reliability, simplifying the stiffening plate structure, and thereby reducing the steel weight, it is possible to reduce manufacturing costs, and by simplifying the stiffening plate, the overall volume is reduced. It can have various excellent effects such as improving the aesthetic appearance.

The present invention will be explained below based on examples.

Figures 3a and 3b show a perspective view and a sectional view of the track girder. The track girder for transmitting the monorail vehicle load to the support has a pair of outer plate lower flanges 17 forming an insertion opening for the suspension link in the center, and an outer plate upper flange 1 facing the lower flanges 17.
1 and a pair of outer plate belly plates 12 which are fixed to both ends of the flanges and whose inner surfaces serve as guide surfaces for guide wheels regulating the direction of the truck, and the size thereof is shown in the cross-sectional view. The shape is such that it does not violate the bogie limit shown by the dashed line in b. Reference numeral 13 denotes a downwardly extending portion of the lower part of the skin plate; 14 denotes a side rib; 15 denotes a stiffening plate in the form of a plate; and 16 protrudes directly below the lower surface of the outer plate lower flange 17 in the longitudinal direction of the track girder. It shows an extended vertical rib.

The downwardly extending portion 13 of the outer skin plate 12 has the effect of creating a wider cross-section and distributing the traveling load over a wide range to the front and rear stiffening plates 15 compared to conventional structures. That is, in FIG. 4, the rigidity around the YY axis increases with respect to the deformation of the cross section in the X direction, and the dispersion effect to the nearby stiffening plate 15 increases. Further, as shown in FIG. 5a, the side ribs 14 are different from the conventional stiffening ring 1 shown in FIG.
The effect of dispersing the corner stress α is greater than that of the FIG. 3 is a diagram comparing the distribution state of corner stress α, where the solid line shows the present example and the broken line shows the conventional one.

As described above, in this embodiment, the stiffening plates are in the form of plates without flanges and are arranged at close intervals, in other words, the soft rings are distributed, so that the cross-sectional stiffness is made uniform in the longitudinal direction. become.
By making the cross-sectional rigidity uniform in this way, the running wheel load is distributed in the longitudinal direction, and at the same time, by providing continuous side ribs on the downward extension of the abdominal plate and on the outer surface of the running surface, this effect is amplified. I can do it. As a result, the degree of stress concentration at the stiffening plate position due to the running wheel load can be halved compared to the conventional type, and reliability against fatigue damage can be improved.

In addition, since the stiffening plates and running girders have a flange-free structure, the structure can be thoroughly simplified and the steel weight can be reduced, improving quality and reducing construction and maintenance costs. Furthermore, by reducing the height of the stiffening plate and removing the flange, it is possible to reduce the overall volume, eliminate the muscular impression, and improve the aesthetic appearance.

[Brief explanation of drawings]

1 and 2 are views showing different conventional examples, respectively. FIGS. 1a and 2a are perspective views, FIGS. 1b and 2b are sectional views, and FIG. 3 is a diagram of the present invention. In the drawings showing one embodiment, a is a perspective view, b is a sectional view thereof, and FIG. 4 is a diagram showing an open state of the cross section of the track girder.
Fig. 5 is a diagram showing the operating state of the side ribs, a is a sectional view, b is a view taken in the direction of arrow A in a, and Fig. 6 is an explanatory diagram of a conventional one corresponding to Fig. 5; a is a sectional view;
b is a view taken along arrow B in a, and FIG. 7 is a diagram comparing the state of distribution of corner stress between what is shown in FIG. 5 and what is shown in FIG. 6. 11: Outer plate upper flange, 12: Outer plate belly plate, 1
3: Lower extension portion, 14: Side rib, 15: Stiffening plate, 16: Vertical rib, 17: Lower outer plate flange.

Claims (1)

[Claims] 1. In a track girder of a suspended monorail that forms the running surface of a bogie on which a vehicle is suspended via suspension links, a pair of outer plate lower flanges 17 that form an insertion opening for the suspension links in the center, and a lower flange of the same lower flange. A box-shaped track is formed by a pair of outer plate upper flanges 11 facing each other and a pair of outer plate belly plates 12 which are fixed to both ends of the flanges and whose inner surfaces serve as guide surfaces for guide wheels regulating the direction of the bogie. The upper surface of the outer plate lower flange 17 is used as a running surface for the running wheels of the bogie, and a vertical rib 16 is provided on the lower surface thereof to protrude directly downward and extend in the longitudinal direction of the track girder. A downwardly extending portion 13 of the outer skin plate 12 is provided which protrudes downward from the outer plate lower flange 17 and extends parallel to the longitudinal rib 16, and the outer plate belly plate is provided on substantially the same horizontal plane as the outer plate lower flange 17. A pair of side ribs 14 are provided that protrude from the side surfaces of the track girders, respectively, and extend in the longitudinal direction of the track girder, and are further provided on the outer surfaces of the outer skin upper flange 11 and the outer skin belly plate 12, perpendicular to the longitudinal direction of the track girder. A track girder for a suspended monorail, characterized in that a plurality of plate-type stiffening plates 15 are arranged spaced apart by a predetermined distance in the longitudinal direction of the track girder.