Manufacturing method of baseplate, base plate manufactured by method of the same, and foundation for seismic isolation device which uses the baseplate of the same as baseplate

Abstract

To provide a baseplate which is for fixing a seismic isolation device that requires a foundation having a side length of 3.2 m, which can be carried from a manufacturing plant to a construction site of a building at low cost, and which can easily bring a filling rate of concrete of a foundation up to 95%, to provide a manufacturing method of the same, and to provide a foundation for seismic isolation device which uses the baseplate of the same as a baseplate.SOLUTION: A baseplate has a frame-like shape, and the frame-like shape comprises a plurality of divided portions. The baseplate can easily be separated into the plurality of portions, and reconnected. The baseplate completed in a manufacturing plant once is separated into the plurality of portions, each separated portion is carried to a construction site of a building, and the baseplate is reconstructed by connecting the portions at the construction site of the building.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a base plate for fixing a seismic isolation device of a building to a foundation, and a foundation for a seismic isolation device that uses the base plate as a base plate. [Background technology]

[0002] A building's seismic isolation device must be installed on each column of the building. The seismic isolation device must be fixed on a strong foundation. The foundation for the seismic isolation device is made by installing a formwork with a square metal plate on top and multiple anchors that secure the metal plate in the ground, and then pouring concrete into the formwork, filling it, and allowing it to harden. This metal plate is called the base plate. The seismic isolation device is fixed to the base for the seismic isolation device via this base plate.

[0003] The more pillars a building has, the less usable space there is within it, so it is better to have fewer pillars. To support a building with fewer pillars, the pillars must be thicker, which requires larger seismic isolation devices and larger base plates. Currently, there is a growing demand for base plates that are approximately 3.2 meters long. However, when transporting a 3.2-meter square plate from the manufacturing factory to the building construction site, the plate protrudes from the trailer bed, necessitating the need for a lead vehicle, which poses a problem of extremely high transportation costs.

[0004] Furthermore, when concrete is filled into a formwork completely covered with metal plates as described above, air bubbles form on the underside of the metal plates, and these bubbles cannot be removed. The pressure resistance of the metal plates in contact with the air bubbles weakens, increasing the probability of the foundation collapsing. The degree of air bubble formation is expressed as the concrete filling rate; the more air bubbles there are, the lower the filling rate. The JSSI Seismic Isolation Structure Construction Standard 2021 (Non-Patent Document 1), established by the Japan Seismic Isolation Structure Association, stipulates a filling rate of 90% or more, with 95% or more being desirable. However, it is extremely difficult to fill a 3.2m square formwork covered with metal plates with concrete at a filling rate of 95% or more.

[0005] Several methods have been proposed for increasing the filling rate of filler, such as concrete, under a base plate of a seismic isolation device foundation. The method described in Patent Document 1 involves first pouring concrete through an injection hole provided approximately in the center of a base plate placed on a formwork, so that the top surface of the poured concrete is approximately 30 to 50 mm below the bottom surface of the base plate. Then, a filler made of cement or other material with higher fluidity than concrete is poured into the space between the top surface of the concrete and the base plate, thereby making it less likely for air bubbles to form between the base plate and the filler. However, there are concerns about this method, given that there are likely differences in physical properties and strength between the concrete and the filler that make up the foundation, which could cause problems with the foundation's performance.

[0006] The method described in Patent Document 2 constructs the top surface of a seismic isolation foundation formation device with a base plate, a concrete pouring jig with an injection hole, a cover with multiple air vent holes, and two openings. This allows for high injection pressure when pouring concrete through the injection holes, thereby improving the uniformity and filling of the concrete. However, this method has the drawback of being slightly larger than the base plate. Furthermore, although multiple air vent holes are provided, the area covered by the base plate is still significantly larger than the total area of ​​the air vent holes, making it difficult to prevent air bubbles from forming in the area covered by the base plate. Furthermore, a base plate measuring 3.2 m square is still required to install a seismic isolation device with a base surface measuring 3.2 m square. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Patent Publication No. 2010-127033 [Patent Document 2] Patent Publication No. 2018-178603 [Non-patent literature]

[0008] [Non-Patent Document 1] JSSI Seismic Isolation Structure Construction Standards 2021, Japan Seismic Isolation Structure Association, p. 91. Summary of the Invention [Problem to be solved by the invention]

[0009] The problem that the present invention aims to solve is to provide a base plate for fixing a seismic isolation device, which requires a foundation measuring 3.2m square, that can be transported from the manufacturing factory to the building construction site at low cost and that makes it easy to achieve a concrete filling rate of 95% or more in the foundation, a method for manufacturing the base plate, and a foundation for a seismic isolation device that uses the base plate. [Means for solving the problem]

[0010] After extensive research, the inventors of the present application came up with the idea that the above-mentioned problem could be solved by making the base plate not a square plate but a square frame-like shape, i.e., a square ring, and then dividing this in half in the middle at the manufacturing factory to create a U-shaped piece, transporting both halves to the construction site, and joining them at the construction site.

[0011] In other words, by dividing a 3.2m square object in half, the external dimensions become 3.2m x 1.6m, so there is no need for a lead vehicle when transporting it.

[0012] Furthermore, by making the base plate frame-shaped, when concrete is poured into the formwork, the central part surrounded by the base plate is exposed and not covered by anything. Therefore, by pouring the concrete until its top surface is slightly higher than the surface of the base plate, and then scraping the top surface so that it is flush with the surface of the base plate after the concrete has hardened, a filling rate of 95% or more can be easily achieved.

[0013] However, creating a base plate with a frame-like shape rather than a square plate, and then dividing the frame into two U-shaped plates and joining them at the construction site to complete the frame-shaped base plate, is technically extremely difficult. The base plate must be completely flat, and multiple bolt holes for securing the seismic isolation device must be provided at each of the four corners, with their locations precisely aligned with the bolt holes in the seismic isolation device. If the base plate were a square plate, it would be easy to flatten the plate and drill the bolt holes in the correct locations. However, when cutting a U-shaped metal plate from steel, it is extremely difficult to precisely align the angles between each side of the U-shape and to ensure the entire plate is flat without distortion. It is also extremely difficult to precisely align the bolt holes for securing the seismic isolation device with the bolt holes in the seismic isolation device. This is because it is difficult to prevent even slight misalignment when joining the two U-shaped plates.

[0014] The inventors of the present application discovered that after cutting the above-mentioned U-shaped metal plate from a steel plate, the U-shaped metal plate can be heated with a gas burner or the like to correct any distortion, thereby adjusting the angle between each side to exactly 90 degrees and making the entire plate flat.

[0015] Furthermore, the inventor of the present application drilled bolt holes for fixing the seismic isolation device in both corners of only one of the above-mentioned U-shaped metal plates, and after combining it with the other U-shaped metal plate, determined the positions at which the bolt holes for fixing the seismic isolation device should be drilled in both corners of the other U-shaped metal plate based on the bolt holes for fixing the seismic isolation device, and drilled the bolt holes at those positions, thereby making it possible to drill bolt holes for fixing the seismic isolation device in positions that exactly match the positions of the bolt holes of the seismic isolation device.

[0016] However, once the base plate is completed in the manufacturing factory with bolt holes for fixing the seismic isolation device drilled in its four corners, it must be disassembled and separated into two halves, transported to the building construction site, and reassembled there. When reassembling the plates at the construction site, it is difficult to prevent slight misalignment, and if misalignment occurs, the positions of the bolt holes for fixing the seismic isolation device in the base plate and the bolt holes in the seismic isolation device will not match. The inventors of the present application solved this problem by joining the two U-shaped metal plates in the manufacturing factory without tightly fitting the ends of the two U-shaped metal plates together at the joint, leaving a gap of approximately 1 mm between them as an adjustment, and then drilling bolt holes for fixing the seismic isolation device in the U-shaped metal plate that did not have bolt holes for fixing the seismic isolation device. In other words, when the two U-shaped metal plates are reconnected at the building construction site, the above-mentioned adjustment allowance can be used to adjust the distance between the two U-shaped metal plates, making it possible to accurately align the position of the bolt holes for fixing the seismic isolation device with the position of the bolt holes for the seismic isolation device.

[0017] Although the shape of the base plate according to the present invention has been described so far as being a square frame, the shape of the frame is not limited to a square, and may be selected as appropriate, such as rectangular, polygonal, or circular, depending on the shape of the bottom surface of the seismic isolation device to be fixed, as long as it is frame-shaped or annular.

[0018] The first invention is a method for manufacturing a base plate for fixing a seismic isolation device to a foundation, the base plate having a frame-like shape and being constructed from two or more divided parts of the frame-like shape, the base plate being once completed and divided into two or more parts and transported to a building construction site, and the two or more parts being joined at the building construction site to reconstruct the frame-like shape, thereby completing the base plate.

[0019] The second invention is a method of manufacturing a base plate for fixing the seismic isolation device according to the first invention to a foundation, comprising the steps of: cutting two frames divided in half at the center from a steel plate; drilling bolt holes for fixing the seismic isolation device at two corners of one of the two frames (hereinafter referred to as the left half plate and the other plate as the right half plate); heating the left half plate with a burner to correct distortion so that the whole is flat and the long and short sides of the left half plate form a right angle; cutting two rectangular frames (hereinafter referred to as connecting plates) from the steel plate; drilling bolt holes for fixing the right half plate on one side of the center in the longitudinal direction of each of the two connecting plates; and attaching the connecting plate to both ends of the left half plate. The right half plate is then heated with a burner to correct any distortion so that the entire plate is flat, and the long and short sides of the right half plate are made to be at right angles. Countersunk holes are drilled at both ends of the right half plate to create tapered holes. Both ends of the right half plate are placed on the connecting plate welded to both ends of the left half plate, and the left and right half plates are fixed to the connecting plate with countersunk bolts and nuts so that there is a gap of approximately 1 mm between the ends of the right half plate and the left and right half plates. The positions for drilling bolt holes for fixing the seismic isolation device at the two corners of the right half plate are determined based on the positions of the bolt holes for fixing the seismic isolation device drilled in the left half plate, and the bolt holes for fixing the seismic isolation device are drilled at the determined positions.

[0020] A third invention is a base plate for fixing a seismic isolation device to a foundation, characterized in that it is manufactured by the manufacturing method according to the first or second invention.

[0021] A fourth invention is a foundation for a seismic isolation device, characterized in that the base plate is the base plate according to the third invention. [Effects of the Invention]

[0022] The present invention provides a base plate for fixing a seismic isolation device, which requires a foundation measuring 3.2m square, that can be transported from the manufacturing factory to the building construction site at low cost and that makes it easy to achieve a concrete filling rate of 95% or more in the foundation, as well as a method for manufacturing the base plate, and a foundation for a seismic isolation device that uses the base plate as a base plate. [Brief explanation of the drawings]

[0023] [Figure 1] FIG. 2 is a diagram showing a base plate according to the first embodiment of the present invention. [Figure 2] 10 is a diagram showing a state in which joining plates are welded to both ends of the left half plate of the base plate according to Example 1 of the present invention. FIG. [Figure 3] FIG. 2 is a diagram showing a state of the right half plate of the base plate according to the first embodiment of the present invention before being coupled to the left half plate. [Figure 4] 1 is a diagram showing a state immediately before the left and right half plates of the base plate according to Example 1 of the present invention are assembled and fixed with flat head bolts. FIG. [Figure 5] 10 is a diagram showing a joining plate welded to an end of a left half plate of a base plate according to Example 1 of the present application. FIG. [Figure 6] 10 is a diagram showing a state in which one end of the right half plate of the base plate according to the first embodiment of the present invention is fixed to the joining plate with a flat head bolt. FIG. [Figure 7] 4 is a cross-sectional view of an end portion of a right half plate of a base plate according to Example 1 of the present invention. FIG. [Figure 8] FIG. 2 is a plan view of an end portion of a right half plate of a base plate according to Example 1 of the present invention. [Figure 9] FIG. 2 is a diagram showing a cross section of a joint between a left half plate and a right half plate when completed in a base plate manufacturing factory according to Example 1 of the present application. [Figure 10] FIG. 2 is a perspective view of a base isolation device foundation using a base plate according to the first embodiment of the present invention, immediately before completion. [Figure 11]1 is a perspective view of a completed base isolation device foundation using a base plate according to Example 1 of the present application. [Figure 12] 1 is a cross-sectional view of a state in which a seismic isolation device is fixed to a seismic isolation device foundation using a base plate according to Example 1 of the present application. DETAILED DESCRIPTION OF THE INVENTION

[0024] Next, an embodiment of the present invention will be described, but it goes without saying that various changes and modifications can be made without departing from the technical scope of the present invention. [Example]

[0025] Figure 1 shows a base plate according to Example 1 of the present application. Base plate 1, which has a square frame shape, is composed of a U-shaped left half plate 2, a similarly U-shaped right half plate 3, and two connecting plates 5 that connect these at two joints 4. Three bolt holes for fixing a seismic isolation device are drilled at each of the four corners of base plate 1.

[0026] 2 is a diagram showing the state in which connecting plates 5 are welded to both ends of the left half plate 2 of the base plate according to Example 1 of the present application. The left half plate 2 is cut out from a steel plate, and three bolt holes 6 for fixing the seismic isolation device are drilled at each corner of the left half plate 2. After that, distortion is corrected by heating with a burner so that the entire plate is flat and the angle between the short and long sides is adjusted to exactly 90 degrees, and then connecting plates 5 are welded to both ends of the left half plate 2.

[0027] 3 is a diagram showing the right half plate 3 of the base plate according to Example 1 of the present application. The right half plate 3 is cut out from a steel plate, and six countersunk holes 7 are drilled at each end of the right half plate 3 for connection to the connecting plate. After that, the right half plate 3 is heated with a burner to correct any distortion so that the entire plate is flat and the angle between the short and long sides is adjusted to be exactly 90 degrees.

[0028] 4 is a diagram showing the state immediately before the left half plate 2 and right half plate 3 of the base plate according to Example 1 of the present application are assembled and fastened together with flat head bolts 8. Both ends of the right half plate 3 are placed on the connecting plates 5 welded to both ends of the left half plate 2, and fastened to the connecting plates 5 with flat head bolts 8 and nuts 11, thereby joining the left half plate 2 and the right half plate 3 together via the connecting plates 5. Next, the positions for drilling bolt holes for fixing the seismic isolation device at the two corners of the right half plate 3 are determined based on the positions of the bolt holes 6 for fixing the seismic isolation device drilled in the left half plate, and the bolt holes for fixing the seismic isolation device are drilled at the determined positions, completing the base plate (1 in FIG. 1).

[0029] This is all done in the manufacturing plant. Once the base plate is completed in the manufacturing plant, the left and right half plates are separated by removing the flat head bolts and nuts that secure the right half plate to the connecting plate, and these plates are transported in this separated state to the building construction site. At the construction site, the left and right half plates are then rejoined via the connecting plate.

[0030] 5 is a diagram showing a joining plate 5 welded to an end of the left half plate 2 of the base plate according to Example 1 of the present application. Two rectangular plates (referred to as joining plates) are cut out from a steel plate, and six bolt holes 9 for fixing the right half plate are drilled on one side of the longitudinal center of each of the two joining plates, and the side without bolt holes 9 is welded to both ends of the left half plate 2 10.

[0031] 6 is a diagram showing a state in which one end of the right half plate 3 of the base plate according to Example 1 of the present application is fixed to a joining plate 5 welded to one end of the left half plate 2 with a flat head bolt 8 and a nut 11. A countersunk hole 7 for passing the flat head bolt 8 is drilled at the end of the right half plate 2.

[0032] 7 is a cross-sectional view of the end portion of the right half plate 3 of the base plate according to Example 1 of the present application. A countersunk hole 7 for passing a flat head bolt is drilled at the end portion of the right half plate 2.

[0033] 8 is a plan view of the end portion of the right half plate 3 of the base plate according to Example 1 of the present application. Six countersunk holes 7 for passing flat head bolts are drilled in the end portion of the right half plate 2.

[0034] 9 is a diagram showing a cross section of the joint between the left half plate 2 and the right half plate 3 when completed at a base plate manufacturing factory according to Example 1 of the present application. The left half of the longitudinal center of the connecting plate 5 is welded 10 to the end of the left half plate 2, and the right half is fixed to the right half plate 2 with a flat head bolt 8 and a nut 11. A gap 12 of approximately 1 mm is provided between the tip of the left half plate 3 and the tip of the right half plate. This gap provides an adjustment margin for accurately aligning the positions of the bolt holes for fixing the seismic isolation device with the positions of the bolt holes for the seismic isolation device when reconnecting the left half plate and the right half plate at the construction site.

[0035] FIG. 10 is a perspective view of a base 16 for a seismic isolation device using a base plate 1 according to Example 1 of the present application, immediately before completion. The base plate 1 is supported by a temporary angle frame 13. Once completed at the manufacturing plant, the base plate (1 in FIG. 1) is separated into a left half plate and a right half plate, which are transported to the building construction site and reassembled at the construction site. At this time, the relative positions of the left half plate and the right half plate are adjusted using the adjustment margin (12 in FIG. 9) and the spacing between the bolts and bolt holes connecting the connecting plate and the right half plate, so that the positions of the bolt holes for securing the seismic isolation device are accurately aligned with the positions of the bolt holes for the seismic isolation device. Anchor bolts 18 for securing the seismic isolation device are installed by passing through the bolt holes for securing the seismic isolation device in the base plate. An anchor plate 19 is attached to the anchor bolts 18. Concrete 15 is filled into the space surrounded by the formwork 14 and allowed to harden. The top surface of the portion of the concrete 15 surrounded by the base plate 1 is surface-treated so that it is flush with the top surface of the base plate 1. Once the concrete has sufficiently hardened, the formwork 14 is removed and the base 16 for the seismic isolation device is completed (FIG. 11).

[0036] 12 is a cross-sectional view of a state in which a seismic isolation device 17 is fixed to a seismic isolation device foundation 16 having a base plate according to Example 1 of the present application as the base plate. The seismic isolation device foundation 16 is constructed on the ground 20. The seismic isolation device 17 is fixed to the base plate 1 and the concrete of the seismic isolation device foundation by anchor bolts 18 and fixing plates 19. [Industrial Applicability]

[0037] In the examples, a square frame-shaped base plate is created by dividing it into two parts and joining them together at the construction site. However, if a larger base for a seismic isolation device is required, and a larger base plate is needed, the present invention also makes it possible to divide the frame-shaped part into three or more parts and join them together at the construction site to complete a huge base plate. [Explanation of symbols]

[0038] 1 base plate 2 Left half plate 3 Right half plate 4 Joint 5. Binding Plate 6 Bolt holes for fixing the seismic isolation device 7 Countersink 8 flat head bolts 9 bolt holes 10 Welded Fixture 11 Nut 12 Gap between the tip of the left half plate and the tip of the right half plate (adjustment allowance) 13 Hypothetical angle stand 14 Formwork 15 Concrete 16 Foundation for seismic isolation device 17 Seismic isolation device 18 Anchor bolt 19 Fixing plate 20 ground

Claims

1. A method for manufacturing a base plate for fixing a seismic isolation device to a foundation, comprising: The base plate has a frame-like shape, The frame-like shape is divided into two or more parts, The completed base plate is divided into two or more parts and transported to a construction site. The two or more sections are joined at the construction site of the building to reconstruct the frame-like shape, thereby completing the building. Base plate manufacturing method

2. A method for manufacturing a base plate for fixing the seismic isolation device according to claim 1 to a foundation, comprising: Two frames are cut out from the steel plate, splitting the frame in half down the middle. Bolt holes for fixing the seismic isolation device are drilled at two corners of one of the two plates (hereinafter referred to as the left half plate, and the other plate as the right half plate), The left half plate is heated with a burner to correct the distortion so that the entire plate is flat and the long and short sides of the left half plate are at right angles. Two rectangular plates (hereinafter referred to as connecting plates) are cut out from a steel plate, and bolt holes for fixing the right half plate are drilled on one side of the center of the longitudinal direction of each of the two connecting plates. The ends of the connecting plate without bolt holes are welded to both ends of the left half plate, The right half plate is heated with a burner to correct the distortion so that the whole is flat and the angle between the long side and the short side of the right half plate is a right angle. Drill countersunk holes on both ends of the right half plate and process tapered holes. The right and left half plates are placed on the connecting plates welded to the left and right half plates, and fixed to the connecting plates with flat head bolts and nuts so that the ends of the left and right half plates are spaced apart by approximately 1 mm. The positions for drilling bolt holes for fixing the seismic isolation device at the two corners of the right half plate are determined based on the positions of the bolt holes for fixing the seismic isolation device drilled in the left half plate, and the bolt holes for fixing the seismic isolation device are drilled at the determined positions. A method for manufacturing a base plate, comprising the steps of:

3. A base plate manufactured by the method according to claim 1 or 2.

4. A foundation for a seismic isolation device, comprising the base plate according to claim 3 as a base plate.

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