JP3787971B2 - How to install seismic isolation devices - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method of installing a seismic isolation device made of laminated rubber or the like between an upper structure and a lower structure in order to support the upper structure in isolation.
[0002]
[Problems to be solved by the invention]
The seismic isolation device is usually installed between the upper structure and the lower structure via upper and lower anchor plates installed in the upper structure and the lower structure, respectively. Each of the upper and lower anchor plates has a cap nut, an anchor bolt, etc., which are welded and fixed in advance, and these cap nut, anchor bolt, etc. are respectively attached to the upper structure and the lower structure. The upper and lower anchor plates are buried in the upper and lower anchor bolts, and the bolts are screwed into the upper and lower cap nuts. The device is bolted to the upper and lower anchor plates.
[0003]
By the way, when cap nuts and anchor bolts are welded to the upper and lower anchor plates, heat is once applied to the upper and lower anchor plates, so that the upper and lower anchor plates are distorted after cooling, and the flatness of the upper and lower anchor plates. Reduce. This decrease in flatness adversely affects the transmission of vertical load from the upper structure to the lower structure and the function of the seismic isolation device after the seismic isolation device is installed between the upper structure and the lower structure. As a result, there is a possibility that the upper structure cannot be seismically isolated as desired. For this reason, distortion correction is performed on the upper and lower anchor plates. However, it is extremely difficult to secure a desired flatness (1.5 mm / m or less) in this distortion correction, and a lot of man-hours are spent, which is a factor of cost increase. Become.
[0004]
In addition, concrete or mortar is driven into the lower surface of the lower anchor plate, and the lower anchor plate is fixed to the lower structure, but the lower anchor plate remains installed on the upper surface of the lower structure. Even if it is difficult to confirm that the concrete or mortar is completely filled on the lower surface, and it can be confirmed that the concrete or mortar is unfilled after drying the concrete or mortar, Replenishment is difficult. If there is an unfilled part of concrete or mortar on the lower surface of the lower anchor plate, the function of the seismic isolation device will be adversely affected as described above, and the seismic isolation device cannot exhibit the designed seismic isolation and support functions. Concern can arise.
[0005]
In addition, the upper and lower anchor plates are relatively expensive, which is one of the obstacles to the application of seismic isolation devices to apartment buildings such as so-called condominiums. It has become.
[0006]
The present invention has been made in view of the above-described points, and an object of the present invention is to provide a seismic isolation device that can omit the lower anchor plate and eliminate the above-described various problems caused by the lower anchor plate. It is to provide an installation method.
[0007]
[Means for Solving the Problems]
The seismic isolation device installation method of the present invention includes a jig plate in which a plurality of through holes are formed corresponding to the through holes formed in the lower plate of the seismic isolation device, and inserted into each through hole of the jig plate. The head has a bolt placed on one side of the jig plate, a cap nut screwed into the threaded part of each bolt protruding from the other side of the jig plate, and the jig plate supported on the foundation floor A combination body comprising a supporting column means is prepared, and this combined body is placed on the foundation floor via the supporting column means, and concrete or mortar is driven under the lower surface of the jig plate, and a cap nut is embedded. The lower structure is formed, and the upper surface of the lower structure is formed flat on the entire lower surface of the jig plate. After the lower structure is formed, each bolt is removed to remove the jig plate from the upper surface of the lower structure. Place the seismic isolation device on the upper surface of the lower structure from which the jig plate has been removed, and screw the bolt into the cap nut in the lower structure via the through hole formed in the lower plate of the seismic isolation device. The seismic isolation device is fixed on the substructure.
[0008]
In the installation method of the present invention, the support means includes a stud fixed to one end of at least some of the plurality of cap nuts. In the present invention, the height of the jig plate from the foundation floor may be adjusted with the stud by making the stud extendable. Further, the support means includes a long bolt that is replaced with or along with the above-mentioned stud and whose head is disposed on one surface of the jig plate and screwed to the jig plate. When the column means includes a long bolt, the height of the jig plate from the foundation floor is adjusted by the long bolt, and after the formation of the lower structure, the long bolt is removed from the jig plate. According to the above method, as a result of adjusting the level of the jig plate, the jig plate can be accurately arranged horizontally, and therefore the level of the upper surface of the lower structure can be easily ensured. The studs may be fixed to all the cap nuts on the other side of the jig plate, but the assembly is placed so as not to fall on the foundation floor, and the jig plate is placed horizontally. As long as it is obtained, it is only necessary to be fixed to one end of at least some of the cap nuts, for example, three cap nuts. The same applies to a long bolt.
[0009]
Moreover, in the installation method of this invention, a mold release material is previously provided to the lower surface and upper surface of the lower plate and upper plate of the seismic isolation device as well as the lower surface of the jig plate of the combined body. According to the method of preliminarily applying the release material to the lower surface of the jig plate of the combined body, the jig plate can be easily removed from the upper surface of the lower structure, and the lower surface of the seismic isolation device and the lower surface of the upper plate and According to the method of previously applying the release material to the upper surface, the seismic isolation device can be easily removed from between the lower structure and the upper structure when the seismic isolation device is replaced.
[0010]
In the above method, after removing the jig plate from the upper surface of the lower structure, if there is an unfilled portion of concrete or mortar on the upper surface, or if the flatness or levelness of the upper surface is insufficient, the upper surface of the lower structure Fill with concrete or mortar to make the upper surface of the substructure flat or horizontal. Thereby, the flatness of the upper surface of the lower structure and the levelness in addition to this can be reliably ensured.
[0011]
In the method of the present invention, after the seismic isolation device is fixed on the lower structure, concrete or mortar is driven on the upper surface of the upper plate of the seismic isolation device to form an upper structure that is supported by the seismic isolation device. . In this case, on the upper surface of the upper plate of the seismic isolation device placed on the upper surface of the lower structure, a cap nut is screwed into a plurality of through holes formed in the upper plate and attached in advance. The upper structure in which the cap nut attached to the upper surface of the upper plate is embedded is formed by driving concrete or mortar onto the upper surface of the upper plate of the seismic isolation device. By using the seismic isolation device in which the cap nut is attached to the upper plate in advance, the upper anchor plate can be omitted and the cost can be reduced.
[0012]
The seismic isolation device installed according to the present invention mainly comprises a laminated rubber body in which rubber layers and reinforcing steel plates are alternately laminated, and a lower plate and an upper plate integrally fixed to both end faces of the laminated rubber body. Or a structure in which a lead strut is disposed inside the laminated rubber body, or a seismic isolation device including a rubber strut may be used instead of the laminated rubber body.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described in more detail based on preferred examples shown in the drawings. The present invention is not limited to these examples.
[0014]
【Example】
As shown in FIG. 1, first, a reinforcing bar 1 made of steel bars is assembled on a foundation floor 31 by welding or the like. Next, the combination 2 shown in FIGS. 2 and 3 is prepared. The combined body 2 is a rectangular jig plate in which a plurality of through holes 6 are formed corresponding to each of the plurality of through holes 5 formed in the disc-like lower plate 4 of the seismic isolation device 3 (see FIG. 6). 7, bolts 10 inserted through the through holes 6 of the jig plate 7, the head 8 being disposed on one surface 9 of the jig plate 7, and bolts protruding from the other surface 11 of the jig plate 7 A cap nut 13 screwed into 10 screw portions 12, and at least some of the cap nuts 13 among the plurality of cap nuts 13, one end 14 of four cap nuts 13 arranged in an axial symmetry in this example. And a telescopic stud 15 fixed thereto.
[0015]
The plurality of through holes 5 in this example are formed in the lower plate 4 of the seismic isolation device 3 at equal intervals in the circumferential direction. Similarly, the disc-shaped upper plate 21 of the seismic isolation device 3 A plurality of through holes 22 are formed at equal intervals in the circumferential direction. In this example, the seismic isolation device 3 includes a laminated rubber body 23 and the upper and lower plates 4 and 21 fixed to both end faces of the laminated rubber body 23, respectively, as shown in FIG. .
[0016]
A large-diameter through hole 25 is further formed in the center of the jig plate 7 made of a steel plate or the like in which a plurality of through holes 6 are formed. ) Is made. A release material is provided in advance on the lower surface 11 of the jig plate 7.
[0017]
The telescopic stud 15 as a support means is composed of a long nut 26 fixed to one end 14 of the cap nut 13 by welding and a bolt 27 screwed to the long nut 26. By rotating the bolt 27, the support pillar 15 is rotated. The height (length) of the stud 15 used as can be adjusted.
[0018]
Next, as shown in FIG. 4, the combination body 2 is disposed on the foundation floor 31 on which the reinforcing bar 1 is disposed with each stud 15 fixed to the cap nut 13 as a support. In this arrangement, a steel plate 33 may be laid between the head 32 of each bolt 27 and the foundation floor 31, and the steel plate 33 may be fixed to the head 32 by welding. After the arrangement, the studs 15 are expanded and contracted to adjust the height of the jig plate 7 and the jig plate 7 is arranged horizontally. At this time, in order to adjust and set the horizontal position of the combination 2, an adjustment tool 37 including an L-shaped bracket 35 and a bolt 36 screwed into the L-shaped bracket 35 is used. The jig plate 7 may be moved in the horizontal direction by temporarily fixing it to the foundation floor 31 around the combination body 2 so as to be able to abut the side surface and rotating the bolt 36.
[0019]
After the arrangement and adjustment of the combination 2, as shown in FIGS. 4 and 5, the mold 41 is assembled by surrounding the combination 2. After assembling the formwork 41, concrete is driven into the lower surface 11 of the jig plate 7 through the through holes 25 to form the lower structure 45 (see FIG. 6) in which the cap nuts 13 are embedded. The concrete may be driven under the lower surface 11 of the jig plate 7 through the through hole 25 as described above, but the mold 41 is assembled by forming a gap around the jig plate 7. The concrete may be driven into the lower surface 11 of the jig plate 7 from this gap. In this way, the jig plate 7 having no through hole 25 can be used, and the upper surface 46 of the lower structure 45 can be easily formed flat on the entire lower surface 11 of the jig plate 7.
[0020]
After the formation of the lower structure 45, each bolt 10 is removed to remove the jig plate 7 from the upper surface 46 of the lower structure 45, and if necessary, the adjustment tool 37 is also removed at this point. In removing the jig plate 7, the hook 51 is welded to the upper surface 9 of the jig plate 7, and a wire is hung on the hook 51 and lifted by a crane or the like. After the jig plate 7 is removed, if there is an unfilled portion of concrete or the like on the upper surface 46 of the lower structure 45, concrete or mortar is driven into the upper structure 46 to fill it, and the flatness of the upper surface 46 of the lower structure 45 And ensure levelness.
[0021]
Next, as shown in FIG. 6, a cap nut 62 is attached to the upper surface 61 of the upper plate 21 by being screwed into each bolt 63 inserted into the plurality of through holes 22 formed in the upper plate 21. The seismic isolation device 3 is prepared, and this seismic isolation device 3 is placed on the upper surface 46 of the lower structure 45 from which the jig plate 7 has been removed using a crane or the like. As shown in FIG. Bolts 65 are screwed into the cap nuts 13 in the lower structure 5 through the through holes 5 formed in the lower plate 4 to fix the seismic isolation device 3 on the lower structure 45.
[0022]
After the seismic isolation device 3 is fixed on the lower structure 5, the formwork 71 is arranged around the upper plate 21 of the seismic isolation device 3 and mortar is driven onto the upper surface 61 of the upper plate 21 of the seismic isolation device 3. Then, a mortar layer 72 and concrete are then driven to form a concrete layer 73. The upper structure 74 in which the cap nut 62 is embedded is formed by driving the mortar and concrete.
[0023]
Hereinafter, by removing the formwork 71, as shown in FIG. 8, an upper structure 74 that is seismically isolated by the seismic isolation device 3 is formed.
[0024]
Note that a release material is applied to the lower plate 4 and the lower surface 75 and the upper surface 61 of the upper plate 21 before placing the lower structure 45 of the lower base device 45 on the upper surface 46. When the seismic isolation device 3 is replaced, the seismic isolation device 3 can be easily removed from between the lower structure 45 and the upper structure 74.
[0025]
In the above installation method, since the upper and lower anchor plates are not used, the cost can be reduced, and the lower plate 4 and the upper plate 21 are not distorted, and the cost for correcting the distortion is not required. Further, since the jig plate 7 is removed, concrete or mortar can be re-injected into the upper surface 46 of the lower structure 45, and the flatness and levelness of the upper surface 46 of the lower structure 45 can be adjusted. The flatness and levelness of 46 can be easily secured.
[0026]
In addition, since the jig plate 7 can be reused in the above installation method, the cost can be reduced also in this respect.
[0027]
In the above description, the strut means is a telescopic stud 15 as the support means. Instead of or along with this, each head is arranged on one surface 9 of the jig plate 7, and each screw portion is the jig plate 7. The column means is composed of a plurality of long bolts each having a length that can be brought into contact with the foundation floor 31 and the tip of each of the bolts, and the height of the jig plate 7 from the foundation floor 31 and its horizontal level. The degree is adjusted by appropriately rotating the long bolt, and after the formation of the lower structure 45, each long bolt is rotated to remove each long bolt from the lower structure 45 and the jig plate 7. Also good. In this case, if a release material is applied to the thread portion of each long bolt, the removal from the lower structure 45 can be easily performed. Further, after the removal, a removal hole is formed on the upper surface 46 of the lower structure 45. However, concrete or mortar may be appropriately driven to fill the hole.
[0028]
【The invention's effect】
As described above, according to the present invention, the lower anchor plate can be omitted, various inconveniences caused by the lower anchor plate can be eliminated, and the upper surface of the lower structure on which the seismic isolation device is installed is flat and horizontal. As a result of the formation, the seismic isolation device can exhibit the seismic isolation and support functions as designed.
[Brief description of the drawings]
FIG. 1 is a perspective view of a bar arrangement for explaining a preferred embodiment of the present invention.
FIG. 2 is a perspective view of a combination for explaining a preferred embodiment of the present invention.
FIG. 3 is a side view of the combination shown in FIG. 2;
FIG. 4 is a side view of the arrangement of bar arrangement and combination and formwork shown in FIGS. 1 and 2;
5 is a perspective view of the arrangement of bar arrangement and combination and formwork shown in FIG. 4; FIG.
FIG. 6 is a side view of an arrangement of a base isolation device and a substructure for explaining a preferred embodiment of the present invention.
FIG. 7 is a side view of the seismic isolation device for explaining a preferred embodiment of the present invention and the arrangement of the substructure and the formwork.
FIG. 8 is a side view of a seismic isolation device installed between a lower structure and an upper structure according to a preferred embodiment of the present invention.
[Explanation of symbols]
2 Combination 3 Seismic isolation device 4 Lower plate 5, 6 Through hole 7 Jig plate 10 Bolt 13 Cap nut 15 Stud 45 Lower structure 65 Bolt

Claims (9)

  A jig plate in which a plurality of through holes are formed corresponding to the through holes formed in the lower plate of the seismic isolation device, and the jig plate is inserted into each through hole, and the head is on one side of the jig plate Prepared a combination body comprising a bolt arranged on the base plate, a cap nut screwed into the threaded portion of each bolt projecting from the other surface of the jig plate, and a column means for supporting the jig plate on the foundation floor Then, this combination is placed on the foundation floor via the support means, and concrete or mortar is driven under the lower surface of the jig plate to form the lower structure in which the cap nut is embedded, and the lower structure The upper surface of the object is formed flat on the entire lower surface of the jig plate. After the formation of this lower structure, each bolt is removed to remove the jig plate from the upper surface of the lower structure, and the lower part from which the jig plate has been removed. The seismic isolation device is placed on the upper surface of the structure, and the bolt is screwed into the cap nut in the lower structure through the through-hole formed in the lower plate of the seismic isolation device. Installation method of seismic isolation device fixed on top. The seismic isolation device installation method according to claim 1, wherein the support means includes a stud fixed to one end of at least some of the plurality of cap nuts. The installation method of the seismic isolation apparatus according to claim 2, wherein the stud is extendable and the height of the jig plate from the foundation floor is adjusted by the stud. The column means has a long bolt whose head is arranged on one side of the jig plate and screwed to the jig plate, and adjusts the height of the jig plate from the foundation floor with the long bolt. The installation method of the seismic isolation apparatus as described in any one of Claim 1 to 3 which removes a long volt | bolt from a jig plate after formation of a lower structure. The installation method of the seismic isolation apparatus as described in any one of Claim 1 to 4 which provides a mold release material previously to the lower surface of the jig plate of a combination. 6. The relief according to claim 1, wherein after the jig plate is removed from the upper surface of the lower structure, the upper surface of the lower structure is filled with concrete or mortar to flatten the upper surface of the lower structure. How to install a seismic device. 7. After fixing the seismic isolation device on the lower structure, concrete or mortar is driven on the upper surface of the upper plate of the seismic isolation device to form an upper structure supported by the seismic isolation device. The installation method of the seismic isolation apparatus as described in any one of. On the upper surface of the upper plate of the seismic isolation device placed on the upper surface of the lower structure, a cap nut is screwed into a plurality of through-holes formed in the upper plate and attached in advance. The installation method of the seismic isolation device according to claim 7, wherein an upper structure in which a cap nut attached to the upper surface of the upper plate is embedded is formed by driving concrete or mortar onto the upper surface of the upper plate of the seismic isolation device. The installation method of the seismic isolation apparatus as described in any one of Claim 1 to 8 which provides a release material previously to the lower surface and upper surface of a lower plate and an upper plate of a seismic isolation apparatus.

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