JP2000074140A - Structure of mounting and fixing part for loop-form steel rod damper for base isolation - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure for securing the restraint of a loop-form steel rod end part by facilitating mounting and removal of a loop-form steel rod damper. SOLUTION: Each loop-form steel rod 1' has two ends processed into a flat rectangular shape and is provided with a bolt hole. To a fixing plate 2 installed on the foundation, a metal fixture 8' is welded in a position confronting the two side faces of the rectangular part with a certain spacing reserved to allow the rectangular part to slip out completely when the steel rod 1' moved horizontally without rotating when the steel rod 1' inserted between a structure concerned and the fixing plate 2 and fastened to the plate 2 by a bolt 5 or the steel rod 1' is removed by loosening the bolt 5, and therein a filler 10' is inserted in the gap W' between the rectangular part 1a of the rod 1' and the metal fixture 8' and secured mechanically.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a fixing portion of a steel loop-shaped steel rod damper used for a seismic isolation structure of a building.

[0002]

2. Description of the Related Art A steel loop-shaped steel rod damper is attached to a fixing plate provided on an upper structure where one end of a loop-shaped steel rod is to be isolated. Then, the other end is attached to a fixing plate provided on the foundation of the structure.
Horizontal displacement during an earthquake causes relative displacement between the superstructure and the foundation of the structure. In response to this relative displacement, the loop-shaped steel rod also undergoes plastic deformation with hysteresis characteristics at each vibration cycle, and the vibration energy is reduced by the amount of energy corresponding to the area surrounded by the hysteresis curve on the hysteresis curve. Absorb. Since the loop-shaped steel bar damper does not have a function of supporting a vertical load, it is usually used together with a laminated rubber bearing.

Further, X, Y perpendicular to the plane of the loop-shaped steel bar
In the direction, the behavior of causing plastic deformation is different. Therefore, if the loop-shaped steel rod is used alone, it is inconvenient that the absorption of vibration energy has directionality. Therefore, the loop-shaped steel rods are usually used as a set of four rods arranged to form a square.

A conventional method of attaching a loop-shaped steel rod damper to a superstructure or a foundation of a structure is to machine both ends of the loop-shaped steel rod into a flat rectangular shape, and then machine the bolt holes. Were attached to the upper and lower fixing plates with one bolt, respectively, and were integrated with the upper structure or the foundation of the structure. In this case, since there is one mounting bolt at both ends of the loop-shaped steel rod, even if the upper structure and the foundation of the structure cause relative displacement due to the seismic motion, the end of the loop-shaped steel rod rotates and causes plastic deformation. Since it is considered that the function does not function as a damper, a fixing bracket for restricting rotation is attached to only one side of the end of the loop-shaped steel bar. In this method, since the other end is rotated, when a large horizontal deformation is given, the plastic deformation of the loop-shaped steel rod proceeds toward the end that does not restrict the rotation, and the loop-shaped steel rod is attached to the fixing plate. A part of the loop-shaped steel rod may come into contact with the attached mounting bolt, or adjacent loop-shaped steel rods may come into contact with each other, adversely affecting the damper performance.

In order to solve this problem, as a method of forming a hole for attaching both ends of the loop-shaped steel rod to the fixing plate at both ends of the steel rod processed into a loop, a die forging method is used. Japanese Patent Application Laid-Open No. H10-150686 discloses a seismic isolation loop-shaped steel rod damper, in which fixing members for restraining the rotation of the end of the steel rod are provided at both ends of the loop-shaped steel rod so as to face each other.
No. 9-149378.

However, when replacing the loop-shaped steel rod damper, the rotation of the end of the loop-shaped steel rod, which is fixed by welding to a fixing plate provided on a structure and a foundation on which the loop-shaped steel rod is directly attached, is performed. It was necessary to gouge some of the fixtures that restrained the pipes and attach new loop-shaped steel rods, and then install the fixtures again by field welding, which required considerable labor, cost, and construction time.

[0007] Therefore, a method of directly fixing the fixing bracket for restraining the rotation of the end of the loop-shaped steel rod with a bolt, or two bolts for restraining the rotation of the end of the loop-shaped steel rod are used for the rectangular part of the end of the steel rod. However, in these methods, the large force acting on the end of the loop-shaped steel rod concentrates the stress on the mounting part, so that the bolt is liable to be loosened. It is conceivable that the degree of fixation of the end portion of the shaped steel bar cannot be obtained and the desired effect as a damper cannot be expected.

Accordingly, it is an object of the present invention to provide a structure of a mounting and fixing portion for facilitating attachment and detachment and replacement of a loop-shaped steel bar damper, and for reliably restraining rotation.

[0009]

Means for Solving the Problems A structure of a fixing portion of a seismic isolation loop-shaped steel bar damper, wherein both ends are processed into a flat rectangular shape between a fixing plate provided on a structure and a foundation, and bolt holes are formed. When inserting the looped steel bar perforated and fixing it to the fixing plate with bolts, or when removing the bolt and removing the looped steel bar, the looped steel bar was moved horizontally without rotating. At this time, a fixing bracket is welded to a fixing plate at a position facing both side surfaces of the rectangular part with an interval at which the rectangular part can completely come out, and the rectangular part of the loop-shaped steel rod and the fixing bracket are welded. And a filler is inserted into the gap between them and mechanically fixed.

Next, a method of attaching a loop-shaped steel rod damper will be described. The loop-shaped steel bar is inserted between the upper and lower fixing plates so as not to hit the fixing bracket. Since there is a space between the fixing brackets provided on the outside and inside of the curvature of the loop-shaped steel bar and the rectangular portion at the end of the loop-shaped steel bar, the loop-shaped steel bar is removed. When the rectangular part at the end of the loop-shaped steel bar comes to the position of the fixing bracket, it moves horizontally by using the fixing bracket as a guide, and moves the rectangular part between the outer fixing bracket and the inner fixing bracket. And fix both ends of the loop-shaped steel bar to the fixing plate with bolts.

The filler is inserted into the gap between the rectangular portion of the steel bar and the fixing bracket, and the filler is bolted to the fixing bracket to complete the attachment. Removal may be performed in the reverse of this operation.

Only one of the upper and lower fixing plates may provide a gap between the rectangular portion and the fixing bracket. Also, the outer fixing bracket and the inner fixing bracket that face each other across the rectangular part are
It is not always necessary to provide a gap on both sides of the rectangular portion. For example, a structure may be employed in which the outer fixing bracket is in close contact with the side surface of the rectangular portion, a gap is provided only between the outer fixing bracket and the inner fixing bracket, and a filler is mounted.

As described above, not only is the attachment and detachment of the loop-shaped steel bar damper easy, but also because the fixing bracket is firmly welded to the fixing plate, the rotation of the end of the loop-shaped steel bar can be restrained without fail. It can demonstrate the function of a simple damper.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view showing the concept of mounting the loop-shaped steel bar damper 1. Reference numeral 1 'is a loop-shaped steel bar, and reference numeral 2 is a fixing plate on the structure 3 and the foundation 4 side, respectively. Reference numeral 2 'is a foundation mounting plate. Reference numeral 5 denotes a bolt for fastening the loop-shaped steel bar 1 ′ to the fixing plate 2. Reference numeral 6 denotes an anchor bolt, and reference numeral 7 denotes a stud bolt.

FIG. 2 is a view as viewed from A in FIG. 1, and FIG.
FIG. Reference numeral 8 denotes a fixing bracket outside the curvature of the loop-shaped steel bar 1 ′, and reference numeral 8 ′ denotes a fixing bracket inside the curvature. Reference numeral 10 ′ denotes a filler attached to the inner fixing bracket with the bolt 9.

In this embodiment, as can be seen from FIGS. 2 and 3, a filler 10 'is mounted on the fixing plate 2 on the side of the foundation 4, and as shown in FIG. The loop-shaped steel bar 1 '
This is an example in which the inner fixing bracket 8 'is welded only inside the curvature of the steel bar while maintaining a gap W' just enough to allow the rectangular portion 1a to escape when the is horizontally moved without rotating.

FIG. 4 is a detailed view of the portion C in FIG.
FIG. 6A is a view before mounting the filler 10 ′ with the bolt 9. (B) is a D sectional view of (a), (c) is an E view of (a), and (d) is an F sectional view of (a).

To remove the mounted loop-shaped steel rod damper 1, first remove the bolts 5 that fasten the steel rods to the fixing plate 2, then loosen the bolts 9 and remove the filler 10 '. A gap W ′ is formed between the steel bar and the steel bar.
As shown in FIG. 5, the gap W 'is larger than the minimum dimension required for the rectangular portion 1a to completely escape from between the outer and inner fixing brackets. You can easily dismantle it.

When the loop-shaped steel bar damper 1 is mounted, the reverse may be performed. In this way, only the attachment and detachment of the filler 10 'is sufficient, so that the loop-shaped steel rod damper 1 can be easily attached and detached, and the outer and inner fixing brackets 8, 8 opposing both sides of the rectangular shape 1a of the steel rod. Is firmly welded to the fixing plate 2 so that the bolted filler 1
When the upper and lower fixing plates 2 are displaced relative to each other even if 0 'is mounted, the end of the loop-shaped steel bar 1' is surely restrained from rotating, causing sufficient plastic deformation and causing the damper Function is secured.

FIG. 7 shows gaps W and W 'at the outside and inside of the curvature of the loop-shaped steel bar 1', and the filers 10, 10 'are provided so as to face each other across the rectangular portion 1a. 8,
8 ′ is an example of welding, and corresponds to FIG. 4 of the one-side filler.
Here, W indicates an outer gap. FIG. 8A shows FIG.
(A). The code is common, but the code 10 indicates the outer filler. (B) is G sectional view of (a), (c) is H view of (a), (d) is I sectional view of (a).

FIG. 8 shows an example in which the filler 10 ′ is fixed to the fixing plate 2 by bolts 9 without fixing the filler 10 ′ to the fixing bracket in the case of the one-side filler of FIG.

[0022]

The effects of the present invention are as follows. When replacing the loop-shaped steel bar damper, fixation that restrains the rotation of the end of the loop-shaped steel bar that is welded and fixed to the fixing plate provided on the structure and the foundation to which the loop-shaped steel bar damper is directly attached After gouging and removing a part of the metal fittings or installing a new loop-shaped steel bar, there is no need to mount the fittings again by field welding. Since the loop-shaped steel rod damper can be easily attached and detached just by removing the filler,
Labor and cost can be saved, and the construction period is shortened. A method of directly fixing the fixing bracket for restraining the rotation of the loop-shaped steel rod end with bolts, or a method of directly fixing two bolts for restraining the rotation of the loop-shaped steel rod end to the rectangular part, etc. The large force acting on the end of the loop-shaped steel rod concentrates the stress on the mounting part, causing the bolt to loosen, failing to obtain a sufficient degree of fixation of the end of the loop-shaped steel rod, and The phenomenon that the effect cannot be expected does not occur. Since the shape of the filler is simple, the production cost is low and mass production is possible.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a concept of mounting a loop-shaped steel rod damper.

FIG. 2 is a view as viewed from A in FIG. 1;

FIG. 3 is a view as viewed from B in FIG. 1;

FIG. 4 is a detailed view of a portion C in FIG. 2 before a filler is mounted.

FIG. 5 is a view showing a state in which the rectangular portion is completely removed from between the fixing brackets.

FIG. 6 (a) is a diagram in which a filler is mounted by a bolt. (B) is a D sectional view of (a), (c) is an E view of (a), and (d) is an F sectional view of (a).

FIG. 7 shows an example in which a gap is provided between the outside and the inside of the curvature of the rectangular portion of the loop-shaped steel bar, and a fixture for providing a filer facing each other with the U-shaped portion therebetween is welded. FIG.
FIG.

FIG. 8A corresponds to FIG. 5A. (B) is G sectional view of (a), (c) is H view of (a), (d) is I sectional view of (a).

9 is a diagram showing an example in which the filler is fixed to a fixing plate with a bolt without fixing the filler to a fixing bracket in the case of the one-side filler of FIG. 4;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Loop-shaped steel bar damper 1 '... Loop-shaped steel bar 1a ... Rectangular part 2 ... Fixing plate 2' ... Foundation mounting plate 3 ... Structure 4 ... Foundation 5 ... Loop-shaped steel bar Damper mounting bolt 5 ': Loop-shaped steel rod Damper mounting bolt hole 6: Anchor bolt 7: Stud bolt 8: Fixing metal fitting outside the curvature of steel rod 8': Fixing metal fitting inside the curvature of steel rod 9 Filler mounting bolt 9 'Filler mounting bolt hole 10 Filler outside curvature of steel rod 10' Filler inside curvature of steel rod 11 Weld metal W Curvature of steel rod The gap between the outer fixture and the side of the rectangular part W '... The gap between the inner fixture of the curvature of the steel rod and the side of the rectangular part

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tetsumi Okamoto 6-2-10 Ginza, Chuo-ku, Tokyo Inside of Tomoe Corporation (72) Inventor Toshiaki Hashi 3-4-5 Toyosu, Koto-ku, Tokyo Stock Company Tomoe Giken F term (reference) 3J048 AA01 AC06 BC03 DA03 EA38

Claims (1)

[Claims] The present invention relates to a structure for attaching and fixing a loop-shaped steel rod damper for seismic isolation, wherein a flat rectangular shape is formed between both ends of a fixing plate provided on a structure and a foundation, and a bolt hole is formed. When inserting the loop-shaped steel bar and fastening and fixing it to the fixing plate with bolts, or when removing the bolt and removing the loop-shaped steel bar, when the loop-shaped steel bar is moved horizontally without rotating,
A fixing bracket is welded to the fixing plate at a position facing both side surfaces of the rectangular part with an interval at which the rectangular part can escape, and a gap between the rectangular part of the loop-shaped steel bar and the fixing bracket is formed. A structure for mounting and fixing a loop-shaped steel rod damper for seismic isolation, wherein a filler is inserted and mechanically fixed.