JPH11324403A - Anchor plate for base isolation device and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an anchor plate for a base isolation which is costless and has no warp and bend and further, which can firmly fix a base isolation device as it is designed by casting the anchor plate body made of cast iron or cast steel and provided with projections for nuts at one side face of the plate and forming a screwed hole extending from the other side face to the inside of the projections for nuts. SOLUTION: An anchor plate body 1 in which projections 2 for nuts having a nearly truncated cone shape are erected at every certain distance in the vicinity of the outer periphery at one side face of a nearly disc-shaped body and nearly columnar anchor projections 3 are erected at every certain distance at the inside thereof, is integrally cast with spheroidal graphite cast iron as the raw material. A screwed hole 4 is machined to extend to the inside of the nut projection 2 from the other side face of the anchor plate body 1. When a base isolation device I using a laminate rubber as an isolator is installed, the anchor plate is disposed on the base isolation device I and a fixing bolt B is screwed in the screwed hole 4 to connect the anchor plate to a support copper plate P of the base isolation device I and interpose it between the base isolation device I and the upper and lower structures U, L.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an anchor plate for a vibration isolator and a method of manufacturing the same, and more particularly, to an anchor plate for a vibration isolator for fixing the vibration isolator to a lower foundation and an upper structure, and a method of manufacturing the same. Things.

[0002]

2. Description of the Related Art Conventionally, for example, a vibration isolator using a laminated rubber as an isolator is generally provided with upper and lower supporting members for supporting the laminated rubber as shown in FIG. 2 of Japanese Utility Model Publication No. 6-40285. The steel plates are fixed to the lower foundation and the upper structure via anchor plates, respectively.

[0003] The anchor plate has an insertion hole that matches a plurality of through holes formed in the supporting steel plate of the vibration isolator, and a long nut is provided on one surface at a position where the insertion hole is formed. An anchor projection (anchor bolt) is provided in a protruding state while being provided in a protruding state, and is supported by screwing a fixing bolt from a through hole of a supporting steel plate to a long nut through a through hole of an anchor plate. By fixing the steel plate and the anchor plate, and burying the long nut and the convex portion of the anchor at the time of concrete placement of the lower foundation or the upper structure, the vibration isolator is fixed to the lower foundation and the upper structure. I have.

[0004]

Conventionally, such an anchor plate is manufactured by welding a long nut or an anchor convex portion of another member to an anchor plate cut into a predetermined thickness and outer shape. However, although there are JIS standards for the thickness of commercially available iron plates, there are no standards for warpage or bending, so many of them have warpage or bending from the time of production. Even though it is possible to specify the one with no warp or bend, it is possible to order a large unit such as 50 or 100 anchor plates. It is impossible, and furthermore, when welding a long nut or an anchor convex part to an iron plate, warping occurs due to heat, and it is always warped and bent in manufacturing.

[0005] If the anchor plate is warped or bent as described above, good adhesion between the anchor plate and the vibration isolator cannot be obtained when the vibration isolator is fixed, and the installation accuracy of the vibration isolator is reduced. Also, as long as the anchor plate is warped and bent, the long nut is not provided vertically,
Even if an anchor bolt is attached to the long nut, the anchor bolt does not stand perpendicularly to the ground contact surface with the concrete of the lower foundation and the upper structure. The lack of fixation compromised safety.

Further, when fixing the anchor plate and the supporting steel plate of the vibration isolator, the fixing bolt is usually screwed to the long nut at 8 to 16 points, and the clearance at the time of tightening the fixing bolt is used. Is set to 3 mm to 5 mm. If the deviation is more than that, it becomes virtually impossible to mount the vibration isolator. However, the clearance value, which is considered to be considerably large, may be provided vertically for the above-described reason. Since many difficult long nuts are provided, it is very difficult to keep this clearance value if the error of each increases, it is necessary to carefully weld the long nuts, and it takes a considerable time for welding work became.

Although it is impossible to completely eliminate the disadvantages of warpage and bending that occur when using an iron plate, various measures have been attempted to endure use. For example, as a precautionary measure, it is necessary to set the iron plate thicker and to gradually weld it over time. That is, each surface is cut little by little to make it smooth. However, Abri requires skilled technology, and it is difficult to prepare a large number of products evenly.Modification by cutting not only risks warping due to heat during cutting, but also causes long nuts and anchor protrusions. The protruding surface cannot be cut, and any countermeasures have led to an increase in manufacturing costs.

Further, in such an anchor plate, the long nut is welded to one surface so that the insertion hole, which is an idiot hole, and the screw hole of the long nut communicate with each other, and the fixing bolt is provided only in the screw hole of the long nut. In this case, since the effective screw part is far from the supporting steel plate of the vibration isolator, a large force is applied to the fixing bolt, and in order to have strength, the long nut and the fixing bolt The length and the burial depth had to be set large. In particular, when the installation depth of the long nut cannot be increased due to structural reasons, such as when the vibration isolator is installed later on the existing structure,
High-strength high carbon is required as the material of the long nut, but welding of iron containing a large amount of carbon and iron is not suitable for welding, so welding work between the long nut and the anchor plate is extremely difficult. , It took a lot of time.

Moreover, such an anchor plate is usually manufactured by cutting a circular or octagonal shape from a square iron plate. At the time of this cutting, a considerable amount of scrap (swarf) remains, and waste is generated in the material. I was

The present invention has been made in view of the above-described problems and the like, and has no warp or bend, and can elongate a long nut portion or an anchor convex portion perpendicularly to a grounding surface, thereby achieving a design as designed. In addition to supporting and fixing, the time and cost required for welding work can be saved, the fixing of the anchor plate to the supporting steel plate of the vibration isolator by the fixing bolt can be strengthened, and the burial depth of the long nut part can be shortened. It is an object of the present invention to provide an anchor plate for a vibration isolator and a method for manufacturing the same, which can expand the degree of freedom in design and use no waste of material.

[0011]

According to the first aspect of the present invention, there is provided a plate-shaped anchor plate body having an appropriate outer shape, and a nut protrusion protruding upright at a predetermined position on one surface of the anchor plate body. Part and a screw hole formed so as to pass from the other surface of the anchor plate body to the inside of the nut protrusion, and the anchor plate body and the nut protrusion are integrally molded by casting using spheroidal graphite cast iron as a material This solves the problem described above.

A second aspect of the present invention provides a plate-like anchor plate main body having an appropriate outer shape, a nut protrusion protruding upright at a predetermined position on one surface of the anchor plate main body, and The anchor plate main body includes an anchor convex portion protruding upright at a predetermined position on one surface of the main body and a screw hole formed to pass from the other surface of the anchor plate main body to the inside of the nut convex portion. The above-described problem is solved by integrally molding the nut, the convex portion of the nut and the convex portion of the anchor by casting using spheroidal graphite cast iron as a material.

According to a third aspect of the present invention, there is provided an anchor plate main body having a suitably shaped plate-like shape and having a nut projection protruding upright at a predetermined position on one surface,
Then, the above-mentioned problem is solved by forming a screw hole that extends from the other surface of the anchor plate main body to the inside of the nut protrusion.

According to a fourth aspect of the present invention, an anchor plate main body having a nut-shaped protrusion and an anchor-shaped protrusion which is a plate having an appropriate outer shape and protrudes upright at a predetermined position on one surface is formed by casting. Then, the above-mentioned problem is solved by cutting a screw hole from the other surface of the anchor plate body to the inside of the nut projection.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below with reference to the drawings. FIG. 1 shows an anchor plate A of the first embodiment, and reference numeral 1 shown in the drawing denotes a thickness of 30 mm and a diameter of 18 mm.
An anchor plate main body 1 is a substantially disk-shaped anchor plate main body having a diameter of 00 mm. In addition to being provided in the upright state, twelve substantially cylindrical anchor projections 3 centered at a position 370 mm inside from the outer periphery are provided at equal intervals in the upright state.

The nut projection 2 has a height of 180 mm, a base diameter of 180 mm, and a top diameter of 160 mm, and has a frustoconical shape. The anchor projection 3 also has a height of 180 mm.
It is frustoconical with a base diameter of 80 mm and a top diameter of 60 mm. Each nut projection 2 is provided with a screw hole having a diameter of 56 mm and a depth of 100 mm, which extends from the other surface of the anchor plate main body 1 to the inside.

The anchor plate main body 1 is integrally formed by casting using spheroidal graphite cast iron as a material. As shown in FIG. 2, first, as shown in FIG. An anchor plate main body 1 having a portion 2 and an anchor convex portion 3 is molded by casting, and then the nut convex portion 2 is formed from the other surface of the anchor plate main body 1.
Is formed by tapping a screw hole 4 communicating with the inside of the hole.

The anchor plate A is shown in FIG.
As shown in the figure, when installing a vibration isolator I using, for example, a laminated rubber isolator, the vibration isolator I is interposed between the upper and lower structures U and L, and the anchor plate A is a vibration isolator. The fixing bolt B is screwed into the screw hole 4 through the through hole p formed in the supporting steel plate P of the vibration isolator I and arranged above and below the device I, thereby joining the vibration isolator I. When forming the foundation of the lower structure L, the underground beam, the column of the upper structure U, and the concrete of the beam, the upper and lower anchor plates bury the nut protrusions and the anchor protrusions, thereby forming the upper and lower structures U, L. Fixed against.
Incidentally, the anchor plate A may be provided with holes for level adjustment and air release at the time of placing concrete,
The holes in that case may be formed by casting.

When spheroidal graphite cast iron is used as the material, it has an excellent effect of absorbing shock and has an important effect in fixing a vibration isolator that hardly transmits a shock to concrete. Carbon as a component acts as a lubricant to prevent galling of bolts (a phenomenon that occurs when bolts and nuts of the same type are burned when a strong force is applied to bolts and nuts of the same kind), and has the effect of preventing rust. However, it may be cast from other cast iron or cast steel.

FIG. 4 shows an anchor plate A of the second embodiment.
It shows. In this embodiment, the anchor plate main body 1 is formed in a rectangular shape, and four nut protrusions 2 similar to those of the first embodiment are provided at the corners of the anchor plate main body 1, and the same anchors as those of the first embodiment are provided. Six protrusions 3 are provided along the circle inside the nut protrusions 2 and are manufactured using spheroidal graphite cast iron in the same process as in the first embodiment.

FIG. 5 is a sectional view showing the use state of the anchor plate A. In order to install the vibration isolator I using a lead damper, the vibration isolator I and the upper and lower structures U and L are used.
And between them.

FIG. 6 shows a rectangular anchor plate body 1 similar to the second embodiment, in which four nut protrusions 2 are provided at the corners, and an anchor protrusion 3 slightly lower than the nut protrusion 2 is provided. This shows a usage state of the third embodiment in which two units are provided between the units 2 in total. This anchor plate A is
It is installed between the vibration isolator I and the upper and lower structures U and L for installation of the vibration isolator I using the steel rod damper.

FIG. 7 shows an anchor plate A according to the fourth embodiment.
It shows. This embodiment is the same as the first embodiment except that the anchor projection is not provided and that the screw hole 4 is provided from the other surface of the anchor plate main body 1 to the tip of the nut projection 2. The fixing bolt B is not only screwed into the screw hole 4 for fixing to the supporting steel plate P of the vibration isolator I, but also the anchor member 5 is inserted from the tip side of the nut projection 2. It is set to be screwed.

The anchor plate main body 1 is also integrally formed by casting using spheroidal graphite cast iron as a material. First, an anchor plate main body 1 having a nut projection 2 protruding upright on one surface. Then, a screw hole 4 penetrating from the other surface of the anchor plate main body 1 to the inside of the nut protrusion 2 and penetrating to the tip of the nut protrusion was formed by tapping.

FIG. 8 is a cross-sectional view showing a use state of the anchor plate A. In this working example, the anchor member 5 has a disk shape in the centrifugal direction centering on the bolt 5a screwed into the screw hole 4. The one provided with the flange portion 5b that protrudes from the front end is adopted. That is, in this embodiment, instead of providing the anchor convex portion 3 as in the first embodiment, an anchor member 5 which exerts resistance to pulling out is set so as to be attached to the tip of the nut convex portion 2. In addition, the anchor member 5 attached to the nut convex part 2 is not limited to the illustrated example, but may be various types such as a general anchor bolt having a large-diameter tip or a dowel-shaped one having an L-shaped tip. Can be adopted.

FIG. 9 shows the anchor plate A of the fifth embodiment. In this embodiment, the point that the anchor projection is not provided and the screw hole 4 is provided on the other surface of the anchor plate main body 1 are shown. The second embodiment is the same as the second embodiment except that the screw holes 4 are provided so as to penetrate to the tip of the nut convex portion 2. The screw holes 4 are provided with fixing bolts for fixing to the supporting steel plate P of the vibration isolator I. (Not shown), as in the third embodiment, an anchor member (not shown) is set so as to be screwed from the distal end side of the nut convex portion 2 as in the third embodiment. In the same process as above, spheroidal graphite cast iron was used as a material.

The anchor plate A according to the fifth embodiment.
Is applied to the installation of a vibration isolator using the same lead damper as the anchor plate A of the second embodiment and a vibration isolator using a steel rod damper of the third embodiment.

The nut projection 2 and the anchor projection 3 are, for example, a column-shaped peripheral surface having a plurality of grooves formed along the circumference at appropriate intervals or other shapes. It is also possible to cast in a variety of shapes, such as those formed with or a part with a large diameter. The nut projection 2 may be formed by cutting the screw hole 4 to the tip so that the anchor member 5 can be attached even when the anchor projection 3 is provided, or conversely, the anchor projection 3 is not provided. In this case, the shape and length of the nut protrusion 2 may be devised to compensate for the force against pulling out, and it is not necessary to cut through the screw hole 4 to the tip.

Further, the shape, size, configuration of the anchor plate main body, shape, size, position, number of the convex portion of the nut, shape, size, position, number of the convex portion of the anchor, and the type of the vibration isolating device are described in each of the embodiments described above. Needless to say, it is not limited to the example.

[0030]

According to the first aspect of the present invention, a plate-shaped anchor plate main body 1 having an appropriate outer shape and a nut projection projecting upright at a predetermined position on one surface of the anchor plate main body 1 are provided. The anchor plate body 1 and the nut protrusion 2 are made of cast iron or cast steel. The screw hole 4 is formed so as to communicate with the inside of the nut protrusion 2 from the other surface of the anchor plate body 1. Since the nut projection 2 is attached to the anchor plate main body 1 very strongly and has a high vertical accuracy in the attachment state, it is compared with a conventional welded product. The strength when shearing force is exerted is stabilized.

Further, the anchor plate main body 1 does not take on a warp or bend unlike conventional products and has an excellent smoothness, so that a good adhesion to the supporting steel plate P of the vibration isolator I is obtained. be able to.

Further, the screw hole 4 into which the fixing bolt B is screwed when the vibration isolator I is fixed to the supporting steel plate P is formed so as to pass from the other surface of the anchor plate main body 1 to the inside of the nut projection 2. Since the effective screw portion is close to the supporting steel plate P of the vibration isolator I, the force is not concentrated on the base of the long nut welded as in the conventional product, and the force transmitted from the fixing bolt B is transferred to the screw hole. Anchor plate main body 1 formed with 4
And the entire nut protrusion 2 can be uniformly received. In addition, since the nut protrusion 2 has a so-called cast surface having fine irregularities, adhesion to concrete is very good. Since the portion 2 is robust, the nut convex portion 2 can be designed to be short, and the degree of freedom in designing the installation portion of the vibration isolator I is expanded.

Further, according to the second aspect of the present invention, a plate-shaped anchor plate main body 1 having an appropriate outer shape and a nut projection 2 projecting upright at a predetermined position on one surface of the anchor plate main body 1 are provided. And an anchor projection 3 which is also provided upright at a predetermined position on one surface of the anchor plate body 1.
And a screw hole 4 formed from the other surface of the anchor plate main body 1 so as to communicate with the inside of the nut convex portion 2. The anchor plate main body 1, the nut convex portion 2, and the anchor convex portion 3 are made of cast iron or Since the cast steel is used as a material and integrally molded by casting, the nut protrusion 2 and the anchor protrusion 3 are:
Since the attachment state to the anchor plate main body 1 is extremely strong and the vertical accuracy of the attachment state is high, the strength when a shearing force is applied is more stable than that of a conventional welded product.

Further, since the anchor plate body also has excellent smoothness without being warped or bent unlike conventional products, it is possible to obtain good adhesion to the supporting steel plate P of the vibration isolator I. Can be.

Further, the screw hole 4 into which the fixing bolt B is screwed when the vibration isolator I is fixed to the supporting steel plate P is formed so as to pass from the other surface of the anchor plate main body 1 to the inside of the nut projection 2. Since the effective screw portion is close to the supporting steel plate P of the vibration isolator I, the force is not concentrated on the base of the long nut welded as in the conventional product, and the force transmitted from the fixing bolt B is transferred to the screw hole. Anchor plate main body 1 formed with 4
And the entire nut protrusion 2 can be uniformly received. In addition, since the nut protrusion 2 has a so-called cast surface having fine irregularities, adhesion to concrete is very good. Since the portion 2 is robust, it is possible to design the nut convex portion 2 to be short, and the degree of freedom in designing the installation portion of the vibration isolator I is expanded.

Further, according to the third aspect of the present invention, the anchor plate main body 1 having a plate-like shape having an appropriate outer shape and having the nut projection 2 projecting upright at a predetermined position on one surface is formed by casting. Next, since the screw hole 4 communicating from the other surface of the anchor plate main body 1 to the inside of the nut projection 2 is formed, a uniform product can be mass-produced as compared with the related art.
By eliminating the need for welding long nuts, the time and cost required for manufacturing can be reduced, and the absence of welding can eliminate the cause of defects such as warpage and bending of the anchor plate body 1.

Since the whole anchor plate A is formed by casting, one of the most important effects is that the strength can be freely designed by changing the composition of carbon and other alloy elements. Become.

Further, the anchor plate A itself manufactured by this method has the same effect as that of the first aspect.

Further, according to the fourth aspect of the present invention, the anchor plate main body 1 having a nut-like projection 2 and an anchor-like projection 3 which is a plate having an appropriate outer shape and protrudes upright at a predetermined position on one surface is provided. It is molded by casting, and then the screw hole 4 communicating with the inside of the nut projection 2 is formed from the other surface of the anchor plate main body 1, so that it becomes possible to mass-produce a product that is more uniform than before, By eliminating the need for welding the long nut and the anchor portion, the time and cost required for manufacturing can be reduced, and the absence of welding eliminates the cause of defects such as warpage and bending of the anchor plate body.

Since the entire anchor plate A is formed by casting, one of the most important effects is that the strength can be freely designed by changing the composition of carbon and other alloy elements. Become.

Further, the anchor plate A itself manufactured by this method has the same effect as the above-mentioned claim 2.

As described above, according to the anchor plate for the vibration isolator of the present invention and the method of manufacturing the same, the fixing strength of the vibration isolator I to the supporting steel plate P and the strength of the nut projection 2 itself or the anchor projection 3 itself. , Nut protrusion 2 or anchor protrusion 3
The fixing strength of the anchor plate A to the concrete is improved, and the fixing of the anchor plate A to the vibration isolator I and the upper and lower structures U and L is stabilized. The seismic isolation device can contribute to exhibiting the designed seismic isolation effect at each installation location and can be provided at a low price by making it possible to freely change the strength by selection and make it possible to mass-produce a uniform anchor plate A. It has an industrially beneficial effect of being able to do so.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view showing an anchor plate for a vibration isolator according to a first embodiment.

FIG. 2 is an end view of the anchor plate showing a manufacturing process of the first embodiment.

FIG. 3 is a sectional view showing a use state of the first embodiment.

FIG. 4 is a partially cutaway perspective view showing an anchor plate for a vibration isolator according to a second embodiment.

FIG. 5 is a sectional view showing a use state of the second embodiment.

FIG. 6 is a cross-sectional view showing a use state of an anchor plate for a vibration isolator according to a third embodiment.

FIG. 7 is a perspective view showing an anchor plate for a vibration isolator according to a fourth embodiment.

FIG. 8 is a sectional view showing a use state of the fourth embodiment.

FIG. 9 is a perspective view showing an anchor plate for a vibration isolator according to a fifth embodiment.

[Explanation of symbols]

A Anchor plate 1 Anchor plate main body 2 Nut convex part 3 Anchor convex part 4 Screw hole 5 Anchor member 5a Bolt part 5b Flange part B Fixing bolt I Isolation device P Support steel plate p Through hole U Upper structure L Lower structure

Claims (4)

[Claims] 1. An anchor plate main body having an appropriate outer shape, a nut protrusion protruding upright at a predetermined position on one surface of the anchor plate main body, and a nut protrusion from the other surface of the anchor plate main body. An anchor plate for an anti-vibration device, comprising: a screw hole formed so as to communicate with the inside of the body; and the anchor plate main body and the nut protrusion are integrally formed by casting using cast iron or cast steel as a material. 2. A plate-shaped anchor plate body having an appropriate outer shape, a nut projection protruding upright at a predetermined position on one surface of the anchor plate body, and a predetermined position on one surface of the anchor plate body as well. The anchor plate main body, the nut protrusion and the anchor protrusion are formed of an anchor protrusion protruding in an upright state, and a screw hole formed so as to communicate with the inside of the nut protrusion from the other surface of the anchor plate body. Is an anchor plate for a vibration isolator, which is integrally formed by casting using cast iron or cast steel as a material. 3. An anchor plate main body having a plate shape having an appropriate outer shape and having a nut protrusion protruding upright at a predetermined position on one surface is formed by casting, and then the nut protrusion is formed from the other surface of the anchor plate body. A method of manufacturing an anchor plate for a vibration isolator, comprising: forming a screw hole communicating with the inside of a part. 4. An anchor plate main body having a nut projection and an anchor projection protruding upright at a predetermined position on one surface of a plate having an appropriate outer shape is molded by casting, and then the other of the anchor plate main body is cast. A method of manufacturing an anchor plate for a vibration isolator, comprising: forming a screw hole from the surface of the nut to the inside of the nut protrusion.