JPH10131382A - Aseismatic structure of open and close roof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify the structure by forming a lock mechanism which prevents the movement of a running truck which supports a roof with a member which comprises soft steel plasticized at a lower yield point over a definite stress and whose rigidity is adjusted. SOLUTION: A lock pin 3 uses a soft steel material which is excellent in a deformation ability after the plasticization of a steel material having strength equivalent to S35C, for example, and a large elongation, for example, yield point of 230N/mm<2> , tensile strength of 300N/mm<2> and elongation of 50% and is formed with members whose rigidity is well adjusted. The lock pin 3 is provided in the central part of a running truck 2 which runs on a rail 2 so that it may penetrate through a bush 4. In the case when a horizontal external force F acts on the truck 1 generated by an earthquake toward the rail 2, if the external force F is less than the limit of elasticity of the lock pin 3, the force of the earthquake will be reduced by the elastic deformation of the lock pin. In the case when the external force F exceeds the limit of elasticity of the lock pin 3, the lock pin 3 will be subjected to plasticity deformation, thereby reducing the force of earthquake. This construction makes it possible to simplify the structure and replace the used component with a new one.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seismic isolation structure such as a retractable roof for a multipurpose ball stadium.

[0002]

2. Description of the Related Art As shown in FIG. 4, a traveling vehicle 1 for supporting and opening / closing a heavy structure moved by a traveling vehicle, for example, an open / close roof of a multi-purpose ball stadium, can travel on a rail 2 for positioning. Has a lock pin 3. In this case, the lock pin 3 is a high-rigidity lock pin having only a role as a fixed pin fulcrum and having a large member rigidity made of a hard material in consideration of earthquake resistance.

[0003]

As described above, if the traveling carriage 1 is completely fixed as an earthquake-resistant structure based on high rigidity, even if an excessive load is applied in an emergency such as a large earthquake, There is a risk of damaging the open / closed roof and traveling trolley, and not only takes enormous amount of time and money to repair, but also the open / closed roof collapses or the high rigidity lock pin breaks and the open / closed roof moves toward the rail. There is also a possibility of inadvertent movement.

Here, in order to hold the structure against a load such as seismic force, it has been proposed to plasticize the upper steel frame structure in order to absorb the load. Is extremely complicated, and once a load such as an earthquake is applied, a plastic member remains in the structure, and it is difficult to partially replace the plastic member.

SUMMARY OF THE INVENTION An object of the present invention is to provide a seismic isolation structure for an openable and closable roof, which has a simplified structure and is replaceable when an essential seismic design is performed.

[0006]

The present invention that achieves the above object has the following matters specifying the invention. (1) In an opening and closing roof in which the roof is opened and closed by movement of a traveling vehicle that supports the roof, a lock mechanism for preventing the movement of the traveling vehicle is made of mild steel having a low yield point, which is plasticized by a predetermined stress or more, and has a rigidity. It is characterized by being formed by adjusting the above.

(2) In the above (1), the adjustment of the rigidity of the member is characterized by extending the natural period.

(3) In the above (1), the lock mechanism has a structure in which a lock pin is inserted into a bush.
It is characterized by being replaceable.

When a lock pin is used to fix the traveling carriage on the openable roof, the material of the lock pin is made of mild steel having a low yield point and the rigidity of the lock pin is adjusted. as can be seen from the attenuation curves showing the characteristics of the period and the response acceleration, when the normal elastic deformation of the lock pin by an earthquake, the long period of T ₁ of the natural period to reduce the seismic force to a _1, further maximum earthquake by plastic deformation of the locking pins against, it increases the damping work to absorb seismic energy can be reduced as seismic forces a ₂ a traveling vehicle as a movable state in the rail direction. Further, the lock pin that has been plastically deformed can be replaced for each bush.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Here, an example of an embodiment of the present invention will be described with reference to FIGS. FIG. 2 shows the plane, front and side of the traveling vehicle with the openable roof, and FIG. 3 shows a perspective view of the side and the openable roof of the traveling vehicle with the lock pin in a plastically deformed state.

In FIG. 2, a lock pin 3 is provided at a central portion of a traveling vehicle 1 traveling on a rail 2 so as to penetrate a bush 4. It is removable and can be replaced.

Here, the material of the lock pin 3 has the same strength as, for example, S35C, and has a large elongation.
For example, yield point 230 N / mm ² , tensile strength 300 N / m
A mild steel material having an m ² and an elongation of about 50% and excellent in deformability after plasticization is used, and the rigidity of the member is adjusted. Therefore, when an external force F horizontal to the rail 2 is applied to the traveling vehicle 1 due to an earthquake or the like, if the external force F is equal to or less than the elastic limit of the lock pin 3, the elastic deformation of the lock pin 3 is used to reduce the rigidity of the member. seismic force at the extension a ₁ natural period shown in FIG. 1 by the adjustment is reduced to 80% of the existing fixed locking pin structure in the range of design ground motion.

When the external force F is equal to or larger than the elastic limit of the lock pin 3, the plastic deformation of the lock pin 3 is used.
Even if a giant earthquake about twice as large as the design seismic motion is applied, the seismic force is 1.3 times and 1.3 / 2.0 = 65%
Can be reduced. That is, the traveling vehicle 1 is made movable in the direction of the rail 2 as shown in FIG. 3A, and the external force F exceeding the elastic limit of the lock pin 3 is reduced to within the elastic limit value of the upper steel structure. In addition to suppressing the damage of the lock pin 3, the breakage of the lock pin 3 expected when a highly rigid material is used for the lock pin 3 can be avoided in principle.

The distance of the gap 6 is sufficiently large so that the plastic deformation of the lock pin 3 can be utilized to the maximum. Further, by laying a plurality of traveling vehicles 1 sliding on the rails 2, the seismic isolation effect can be further enhanced.

FIG. 3A shows a state where the lock pin 3 is plastically deformed in the rail 2 direction when an external force F due to an earthquake or the like exceeding the elastic limit of the lock pin 3 is applied to the traveling vehicle 1. In FIG. 3B, the traveling vehicle 1 is movable in the direction of arrow 7 due to the plastic deformation of the lock pin 3 described above, and an external force F exceeding the elastic limit of the lock pin 3 is attached to the upper portion of the traveling vehicle 1. Of the opening / closing roof 5 within the elastic limit inherent to the support 9. The external force F thus relieved vibrates in the direction of arrow 8 within the allowable range of the elastic deformation of the open / close roof 5 at the design value, and is completely absorbed, thereby suppressing damage to the open / close roof 5 and the traveling vehicle 1. I do.

Thus, in the present embodiment, the natural period is lengthened within the elastic range of the lock pin 3 for a normal earthquake, and when a large load is applied by a large earthquake, the lock pin 3 is plastically deformed and the seismic force is increased. And seismic energy absorption. That is, the seismic force is reduced by increasing the natural period, and furthermore, the bogie becomes movable in the rail direction due to the plasticization of the lock pin, thereby exceeding the elastic limit of the steel frame structure on the bogie. The transmission of the load to the upper part is suppressed, and furthermore, the seismic motion is completely absorbed by the elastic stress of the steel frame structure on the bogie such as the rigid frame structure or the truss structure, thereby preventing the opening / closing roof from being damaged.

[0017]

As described above, according to the present invention, damage to the open / close roof and the traveling vehicle can be suppressed by a simple structure, and the collapse and unintentional movement of the open / close roof due to breakage of the lock pin can be avoided. Further, the replacement work of the lock pin after the plastic deformation is only required to be replaced together with the bush, so that a large-scale preliminary design and construction and a large-scale subsequent repair work are not required.

[Brief description of the drawings]

FIG. 1 is a diagram showing a damping curve of a natural period and a response acceleration.

FIG. 2 is a configuration diagram of a traveling vehicle.

FIG. 3 is a diagram illustrating a deformation of a lock pin and a structure of an opening / closing roof.

FIG. 4 is a configuration diagram of a traveling vehicle according to the related art.

[Explanation of symbols]

 1 traveling trolley 3 lock pin 4 bush

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yukitaka Someya 1-1-1 Wadazakicho, Hyogo-ku, Hyogo-ku, Kobe-shi, Hyogo Mitsubishi Heavy Industries, Ltd.Kobe Shipyard (72) Inventor Hiroyuki Nunoyama 2-1-1, Mitsubishi Heavy Industries, Ltd. Takasago Research Laboratory

Claims (3)

[Claims] An open / close roof for opening and closing a roof by moving a traveling vehicle that supports the roof, wherein a lock mechanism for preventing the movement of the traveling vehicle is made of mild steel having a low yield point that is plasticized by a predetermined stress or more. The seismic isolation structure of the open / close roof, which is formed by adjusting the rigidity of the members. 2. The seismic isolation structure for an openable roof according to claim 1, wherein the adjustment of the rigidity of the member extends the natural period. 3. The seismic isolation structure for an open / close roof according to claim 1, wherein the lock mechanism has a structure in which a lock pin is inserted into a bush and is replaceable.