JP2578088B2 - Bearing device of steel truss for openable roof - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a support device for a steel truss in an openable roof capable of opening and closing a large roof of a stadium, a stadium, and the like.

[Conventional technology]

Conventionally, as shown in FIG. 4, one end of a truss 21 has a fixed support 22 and the other end has a strain caused by the expansion and contraction of the truss length caused by automatic or temperature change, as shown in FIG. Movable bearing 23 to prevent it from occurring
In addition, a structure is known in which a moving mechanism such as a wheel for movement is attached along the rail 24 below the bearings 22 and 23 for opening and closing the roof.

[Problems to be solved by the invention]

In the structure of the conventional steel truss, the longitudinal expansion and contraction of the truss caused by its own weight, hanging load, snow load, temperature change, etc., affects the lower structure because the other end is a movable bearing. However, in the case of an earthquake, the other end is a movable bearing, so the horizontal force due to the earthquake is not transmitted, and the seismic force must be borne only by the fixed bearing at one end. There was a problem that the processing could not be performed with the seismic force incurred, and the seismic safety was reduced.

In order to eliminate this problem, if both ends of the truss are fixed bearings, the seismic force will be halved at both ends and the load will be balanced, so the seismic safety will be high, but its own weight, suspension load, snow load or temperature There is a problem that the displacement of the truss in the longitudinal direction due to the change or the like cannot be escaped and the truss is distorted, and an excessive force is applied to the moving mechanism, so that the wheels and the rail do not mesh smoothly and cannot travel.

The invention provides a steel frame for an openable roof that prevents the truss from being distorted by displacing the longitudinal displacement of the steel truss, and that seismic force is evenly distributed to both ends of the truss to enhance seismic safety. It is an object to obtain a truss bearing device.

[Means for solving the problem]

In order to solve the above problems, the present invention provides a steel truss 1
At one end via a fixed bearing 2 and at the other end a steel truss 1
Mounted on the moving mechanism 3 via a movable bearing 4 which allows a displacement in a longitudinal direction perpendicular to the moving direction A of the steel truss in the openable roof using a velocity proportional viscous damper as the movable bearing 4. The means of taking.

(Operation)

 The operation of the present invention will be described with reference to embodiments.

Since one end of the steel truss 1 is fixed by the fixed bearing 2, a change in the length in the length direction caused by a long time due to its own weight, a hanging load, a snow load or a temperature change is expressed as a displacement of the other end. However, since a velocity proportional viscous damper is used as the movable bearing 4 at the other end, the value of the viscous shear force of the viscous body 19 is extremely small in the case of displacement at a slow speed for a long time, so that the steel truss 1 is moved. The mechanism can be moved freely without affecting the mechanism.

However, since the seismic vibration is very fast in a very short time during an earthquake, the value of the viscous shear force of the viscous body 19 in the velocity-proportional viscous damper as the movable bearing 4 at the other end becomes extremely large. Is not allowed in the longitudinal direction. Therefore, the seismic force is equally applied to both ends of the steel truss 1 by both ends in the same manner as the fixed bearing, and seismic safety can be enhanced.

〔Example〕

 An embodiment of the present invention will be described with reference to the drawings.

FIG. 1 schematically shows a part of the openable roof according to the present invention. One end of a steel truss 1 is mounted on a moving mechanism 3 via a fixed bearing 2, and the other end is a moving direction A of the steel truss 1.
It is mounted on the moving mechanism 3 via a movable bearing 4 which allows a displacement in a longitudinal direction perpendicular to the moving mechanism 3.

FIG. 2 shows the details of the vicinity of the moving mechanism 3 of the steel truss 1. The base 1a at the left end of the steel truss 1 is mounted on the rack 5 via the fixed bearing 2, and the moving mechanism 3 is mounted on the side of the rack 5. The roller 6 is guided by the guide rail 9 on the inner wall 8 of the box-shaped rail 7, and the teeth 11 on the lower surface of the rack 5 are provided on the outside of the box-shaped rail 7.
It is configured to engage with the pinion 12 driven by the motor. A base 1b at the right end of the steel truss 1 is attached to a rack 5 via a movable bearing 4, and engages with a pinion 12 like the right end.

It should be noted that instead of the moving mechanism using the rack and the pinion 12, a sprocket driven by a motor is engaged with a chain having one end fixed to a movable portion corresponding to the rack 5,
Alternatively, the truck may be run on a rail.

FIG. 3 shows details of the movable bearing 4. The upper part of the support plate 13 for supporting the base 1b of the steel truss 1 has a projection 14 which engages with the base 1b. A substrate 16 of a casing 15 is provided, and a support plate 13 is attached to the casing 15 as a lid thereof, and extends downward integrally from both sides of the support plate 13 so as to provide an interval between the substrate 15 and the substrate 16 of the casing 15. A number of thin plates 18 are stacked and mounted in parallel between the mounting arms 17 at intervals, and the casing 15 is filled with a butane-based polymer compound 19 as a viscous material, and the displacement speed of the steel truss 1 is reduced. A velocity proportional viscous damper having a function of permitting displacement when the displacement is small and disallowing displacement when the displacement speed is large is constructed.

It should be noted that the thin plates 18a may be laminated and fixed so that the thin plates 18a do not contact the thin plates 18 on the side walls 20 of the casing 15 within the interval between the multiple thin plates 18 attached to the mounting arm 17 of the support plate 13. Good.

〔The invention's effect〕

The present invention allows a displacement in the longitudinal direction of a steel truss due to its own weight, a hanging load, a snow load, a temperature change, or the like, and does not cause the steel truss to be slackened. Without any friction or friction, thus ensuring smooth movement without disabling the vehicle.Because the longitudinal displacement of the steel truss that occurs during an earthquake is evenly distributed at both ends of the steel truss, seismic safety is ensured. Performance can be improved.

[Brief description of the drawings]

1 to 3 show an embodiment of the present invention.
FIG. 2 is a perspective view schematically showing a part of a roof, FIG. 2 is a perspective view showing details of a steel truss and a moving mechanism, FIG. 3 is a cutaway front view of a speed proportional viscous damper, and FIG. It is explanatory drawing which shows an outline. 1 ... steel frame truss, 2 ... fixed bearing, 3 ... moving mechanism,
4 ... Movable bearing, A ... Moving direction

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hiroshi Abe 8-21-1, Ginza, Chuo-ku, Tokyo Inside the Tokyo head office of Takenaka Corporation (72) Inventor Mamoru Kimura 2-5-14-1 Minamisuna, Koto-ku, Tokyo No. Takenaka Corporation Technical Research Institute (72) Inventor Akira Okada 2-5-1-14 Minamisuna, Koto-ku, Tokyo Inside Takenaka Corporation Technical Research Institute

Claims (2)

(57) [Claims] 1. A bearing (2) for fixing one end of a steel truss (1).
Movable bearing (4) which allows longitudinal displacement perpendicular to the moving direction (A) of the steel truss (1) via the other end
A supporting device for a steel truss in an openable roof using a velocity-proportional type viscous damper as a movable bearing (4), mounted on a moving mechanism (3) via a movable mechanism (3). 2. A supporting device for a steel truss in an openable roof according to claim 1, wherein the viscous body of the velocity proportional viscous damper is a butane polymer compound.