JP3049985U - Base plate for seismic isolation members - Google Patents

Abstract

(57) [Summary] [Purpose] A base plate for a laminated rubber bearing that is simple and highly accurate by screwing a cap nut and a shear connector together [Structure] A base plate for a laminated rubber isolator of a base isolation structure By joining accessories such as nuts and shear connectors with screws, distortion of the base plate that occurs in the case of joining by welding is suppressed, and machining accuracy is increased. In addition, the accuracy of the mounting position of the cap nut is improved. Mainly on mechanical processing, improve quality and economy.

Description

[Detailed description of the invention]

[0001]

[Industrial applications]

 The present invention relates to a base plate of a seismic isolation laminated rubber bearing in a seismic isolation structure.

[0002]

[Prior art]

 Conventionally, the base plate of the seismic isolation laminated rubber bearing body is joined by welding the cap nut 5 to the base plate 3 as shown in FIG. 6, and joining the shear connector 7 to the base plate 3 by welding as shown in FIG. doing. In FIG. 1, a cap nut 5 couples a laminated rubber bearing body 10 to a base plate 3 by an anchor bolt 4. The base plate 3 is connected to the upper structure 8 and the lower structure 9 by the shear connector 7. Thereby, when a horizontal displacement occurs between the upper and lower structures during an earthquake, a force is transmitted between the upper and lower structures via the shear connector 7, the base plate 3, the anchor bolts 4, and the laminated rubber bearing body 10.

[0003]

[Problems to be solved by the invention]

 Conventionally, in FIG. 1, a cap nut 5 and a shear connector 7 are joined by welding. In this case, due to the heat input of welding, the base plate 3 generates unevenness in plan view. On the other hand, the seismic isolation laminated rubber bearing 10 has the function of transmitting the vertical load coming from the upper structure to the lower structure. For this reason, it is not preferable in terms of load transmission that the base plate 3 has a large distortion and a gap is formed between the upper and lower plates 2 of the seismic isolation laminated rubber bearing body 10. Conventionally, the following method has been adopted to remove the distortion caused by the welding and secure the flatness of the base plate 3. (1) After the base plate 3 is partially heated, the base plate 3 is quenched with water or the like and straightened by removing reverse distortion. (2) The thickness of the base plate 3 is increased to suppress the amount of distortion. (3) After the base plate 3 is welded, its surface is cut to ensure planar accuracy. However, in the method (1), only incomplete accuracy can be secured, the amount of work is large, and there is a problem in economy. Even with the method (2), the strain cannot be completely removed, and there is a problem in economical efficiency due to an increase in the number of materials. In the case of (3), although the plane accuracy is ensured, the processing cost is increased and there is a problem in economy.

[0004]

[Means for Solving the Problems]

 To advantageously solve the above problem, in FIG. 1, in the base plate of the present invention, the shear connector 7 and the cap nut 5 are connected to the base plate 3 by screws. This eliminates the problem of distortion occurring when joining by welding. In FIG. 2, the cap nut 5 is provided with a screw on the outer periphery thereof, and is coupled to a space 12 provided on the base plate 3. The outer peripheral screw 14 is tightened at the same time when the bolt 4 is tightened as a reverse screw relationship with the bolt 4. Since the drilling of the base plate is performed simultaneously by a multi-axis drill, the accuracy is high, and it is easy to secure the accuracy of the mounting position of the cap nut. In addition, the connection by the screw has high watertightness, and can prevent water from entering from the gap between the cap nut 5 and the base plate 3. In addition, since the shear connector 7 transmits a horizontal force during an earthquake, securing safety against breakage due to repeated loads is an issue. In the case of conventional welded joints, quality control of welds is often carried out by visual inspection or extraction bending tests, making it difficult to perform a complete check. In the case of the present invention, since the shear connector is manufactured and managed in the factory, quality assurance is easier than in the case of joining by welding. Further, a slight bending caused when the base plate 3 is cut can be easily and economically removed by using a multi-axis drill when drilling holes for the shear connector 7 and the cap nut 5. Furthermore, as described in claim 2, a ring 15 is provided at the joint between the shear connector 7 and the base plate 3 to reinforce the shear connector 7, so that the proof stress can be easily increased.

[0005]

Embodiment 1 Next, an embodiment of the present invention will be described with reference to FIGS. A laminated rubber support 10 is provided between the upper structure 8 and the lower structure 9, and the upper and lower plates 2 of the laminated rubber support 10 are connected to the base plate 3 by bolts 4 and cap nuts 5. The base plate 3 is connected to the upper structure 8 and the lower structure 9 by a shear connector 7. In FIG. 2, a screw hole 6 is provided on the base plate 3 and a female screw 14 is provided on the inner periphery thereof. A male screw is provided on the outer periphery of the cap nut 5 and is connected to the hole 6. In addition, the screw of the bolt 4 and the outer peripheral screw of the cap nut 5 have a reverse screw relationship, and the nut 5 is simultaneously tightened by tightening the bolt 4. In FIG. 3, the shear connector 7 is connected to the base plate 3 by screws.

[0006]

[Effect of the invention]

 According to the present invention, in FIGS. 1 to 5, in the upper and lower base plates 3 of the laminated rubber bearing body 10 installed between the upper structure 8 and the lower structure 9, the shear connector 7 and the cap nut 5, the base plate 3, Since the joints are made by mechanical joining instead of by welding, no distortion occurs due to welding heat input. In the case of conventional stud welding, it was difficult to completely confirm the quality after welding. However, in the case of the present invention, since the manufacture of the shear connector 7 and the drilling of the base plate 3 are performed at a factory, Quality control can be performed easily and accurately. The cap nut 5 can be simultaneously tightened to the base plate 3 by tightening the bolt 4 with a reverse screw installed on the outer periphery. Further, the drilling of the base plate 3 can be performed at one time and accurately using a multi-axis drill, and the cap nut 5 can be accurately set at the mounting position. Even a slight bending that occurs when the base plate 3 is cut can be relatively easily corrected by a press or the like before the shear connector 7 or the cap nut 5 is attached. Further, by attaching the plane cutting device to the multi-axis drill, it is possible to simultaneously perform the plane cutting when the cap nut 5 and the shear connector 7 are drilled. As described above, in the present invention, by eliminating the joining by welding, the occurrence of distortion of the base plate can be suppressed, and the processing can be automated and rationalized, which is excellent in economy.

[Brief description of the drawings]

FIG. 1 is a front view showing a base plate, a laminated rubber bearing and upper and lower structures according to an embodiment of the present invention. It is a front view showing a base plate, a laminated rubber bearing and upper and lower structures in a conventional method.

FIG. 2 is an enlarged sectional view showing a part of FIG. 1;

FIG. 3 is an enlarged sectional view showing a part of FIG. 1;

FIG. 4 is a sectional view taken along line AA of FIG. 1;

FIG. 5 is a sectional view taken along line BB of FIG. 1;

FIG. 6 is an enlarged sectional view showing a part of FIG. 1;

FIG. 7 is an enlarged sectional view showing a part of FIG. 1;

FIG. 8 is an enlarged sectional view showing a joint between a shear connector and a reinforcing ring.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Laminated rubber part of laminated rubber bearing 2 Upper and lower plate parts of laminated rubber bearing 3 Base plate 4 Anchor bolt 5 Cap nut 6 Hole for coupling cap nut 7 Shear connector 8 Upper structure 9 Lower structure 10 Laminated rubber support 11 Hole for connecting shear connector 12 Weld metal 13 Weld metal 14 Screw outside cap nut 15 Reinforcing ring for shear connector

Claims (2)

[Utility model registration claims] 1. A shear connector (7) is connected to a base plate (3) by screws on the upper and lower base plates (3) of a seismic isolation laminated rubber bearing body (10). Screw 1
A base plate characterized in that the base plate (4) is installed and coupled to the base plate (3). 2. The shear connector 7 according to claim 1,
A base plate characterized in that a reinforcing ring (15) is provided at a joint between the base plate (3) and the base plate (3).