JPS62297554A - Seismic isolator - Google Patents

Abstract

PURPOSE:To enable the replacement of an isolator section without requiring the jackup of the entire building by arranging a pad having a wedge member on the upper or lower face of a laminated rubber isolator and making said wedge member movable. CONSTITUTION:A decomposable pad 13 comprising a lower wedge member 6, an upper wedge member 7 and a planar member 8 is arranged on the upper or lower face of a laminated rubber isolator 4. The wedge members 6, 7 are overlapped slidably with the tapered faces 6a, 7a thereof contacting each other, while the planar member 8 is lapped over the horizontal face of the wedge member 6 or 7 at the side not fixed to the isolator 4 then secured to a building 13 or a foundation 1. The isolator 4 can be replaced by removing a coupling means 11 for integrating respective members 6-8 dismountably and drawing the upper wedge member 7.

Description

[Detailed Description of the Invention] 3. Detailed Description of the Invention <Industrial Application Field> The present invention relates to a seismic isolation device interposed between a building and a foundation for mitigating earthquake force. This invention relates to an isolator made by alternately stacking a plurality of thin flat plates such as rubber and flat metal plates.

<Prior Art> As a so-called laminated rubber isolator of this type, there is known a structure in which, for example, rubber plates with a diameter of 500 am and a thickness of 7 cm and iron plates with a thickness of 3 nm are alternately bonded and stacked. An isolator with such a structure requires only about 1/1000 of the force required to deform a unit amount in the direction of the laminated surfaces, and is flat in shape, so it is easy to connect to the building and the foundation. It can sufficiently support the weight of a building even if it shifts considerably in the horizontal direction, and recently it has begun to be used on a trial basis in some buildings to alleviate lateral shaking caused by earthquakes. That is, this isolator 41
As shown in the figure, several dozen isolators are installed with the upper end fixed at a position corresponding to the main pillar on the bottom of the building 42 and the lower end fixed to the foundation 43. Even if the building 42 shakes as much as it does, the building 42 only sways slightly as shown by arrow B.

<Problems to be Solved by the Invention> By the way, the thin rubber plates of the above-mentioned laminated rubber isolator are constantly subjected to large compressive loads from buildings, so deterioration over time is unavoidable. In such a case, or if the isolator itself breaks down, it will be necessary to replace the entire isolator as shown in FIG. This method is
(a) Remove the bolts 44 and 44 that connect the isolator 41 to the building 42 and the foundation 43, and (b) raise the entire building 42 by D = 2 to 3 cm using the jack 45 (at this time, the isolator 41 is elastically deformed by d). (C) After removing the old isolator, (d) Installing the new isolator 41' in the specified position, (e) Lowering the entire building 42 with the jack 45, and moving the isolator 41° and the building 4.
2 and the foundation 43 are connected with bolts 44 and 44.

However, the number 10 installed between the building 42 and the foundation 43
All of the isolators are bolted to the building at their upper ends and to the foundation at their lower ends, and the entire building 42 must be jacked up evenly to replace a single defective isolator. Therefore, several 10 ~
This method has disadvantages in that it takes a long time and a large number of workers to tighten and remove several hundred connecting bolts, and it also requires a large number of jacks. In addition, it is difficult to manage a large number of jacks in a well-balanced manner, and there are problems such as there being no way to deal with an earthquake if an earthquake occurs during replacement.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a seismic isolation device that does not require jacking up a building when replacing a laminated rubber isolator, and allows the work to be limited to only the part of the isolator that should be replaced, thereby significantly simplifying the replacement work. It is to be.

Means for Solving the Problems In order to achieve the above object, the seismic isolation device of the present invention consists of a laminated rubber isolator and a disassembly pedestal fixed to the upper or lower surface of the isolator. The pedestal is interposed between a pair of wedge-shaped members that are slidably stacked on top of each other with their tapered surfaces in contact with each other, and stacked on the horizontal surface of the wedge-shaped member on the side that is not fixed to the isolator, It is characterized by comprising a flat plate-like member fixed to a building or a foundation, and a connecting means for removably integrating the pair of wedge-shaped members and the flat plate-like member.

<Operation> A plurality of support jacks are extended and erected between the foundation around the base isolation device to be replaced and the bottom of the building. Next, the flat plate member of the pedestal and one of the wedge-shaped members fixed to the isolator are integrally connected by a connecting member, and a jack is fixed to this connecting member in the direction of the tapered surface, and the rod of this jack is attached to the above-mentioned Connected to the other wedge-shaped member which is sandwiched between the flat plate-shaped member and one wedge-shaped member. Next, after removing the connection means of the pedestal, the jack is driven to pull out the other wedge-shaped member via the rod, and then the jack and the coupling member are removed.

After that, we removed the connecting bolts that fixed the isolator to the foundation or building, removed the isolator, and brought in a new isolator to replace it.

Fix it. Next, the connecting member is connected to the flat member and the opposite side of one of the wedge-shaped members, a jack is similarly fixed to this connecting member, and the rod of this jack is connected to the other wedge-shaped member. Subsequently, the jack is driven in the opposite direction to draw in the other wedge-shaped member, and the pair of wedge-shaped members and the flat plate-shaped member are integrally connected by the connecting means of the pedestal.

Finally, after removing the coupling member and jack, the support jack is removed to complete the replacement of the seismic isolation device.

<Example> Hereinafter, the present invention will be explained in detail with reference to illustrated embodiments.

FIG. 1 is a half-sectional view showing one embodiment of a seismic isolation device, and 1
is the foundation, and 2 is this foundation 1 with stud dowels 3, 3.・・・
The base plate 4 is embedded and fixed with the bolts 5.5. 6 is a lower wedge-shaped member fixed to the upper surface of this isolator 4 with the tapered surface 6a facing upward;
7 is a tapered surface 7 on the tapered surface 6a of this lower wedge-shaped member 6.
The upper wedge-shaped member 8 is stacked on the horizontal upper surface 7b of the upper wedge-shaped member 7, and
Stud dowels 9, 9 at the bottom of the building 10. The flat plate member 11 embedded and fixed therein is inserted into a through hole 12 provided vertically through the lower wedge member 6, upper wedge member 7, and flat plate member 8, and these members are It is a connecting bolt as a connecting means to be integrated, and each of the above members 6,
7.8 and the connecting pole) 11 constitute a pedestal 13.

The upper and lower wedge-shaped members 7.6 and the flat plate-shaped member 8 are
In both cases, concrete 15 is placed inside the outer shell formed of steel plate 14.
A plurality of sheath pipes 16 and 17 are provided inside the member, which are filled with the material and pass through the member horizontally in the direction of the Taber surfaces 6a and 7a. As shown in Fig. 3.4, these sheath pipes are lined up in parallel in the same horizontal plane to form a PC steel rod insertion hole, and the sheath pipe 16 of the upper wedge-shaped member 7 is closer to the lower wedge-shaped member. The hole diameter is larger than that of the sheath tube 17 of the member 6 and the flat plate member 8. Tapered surfaces 7a of the upper and lower wedge-shaped members 7, 6;
The slope of 6a is about 1/10. The through hole 12 is
As shown in Fig. 2, the connecting bolts 11, which are provided at the four corners of each member and inserted from below into the through holes 12, are embedded in the bottom part 10 of the building and are inserted into the bottom corner [8 (see Fig. 1)]. be screwed on. Further, bolts 5 for fixing the base plate 2 are screwed into cap nuts 19 embedded in the foundation 1.

FIG. 5, FIG. 6, and FIG. 7 are a side view, a front view, and a rear view, respectively, of a device for attaching and detaching the wedge-shaped member 7.

In these figures, 2I is a coupling plate that abuts on one end surface 13a of the pedestal 13 in the tapered surface direction, and 22 is a coupling plate having a U-shaped cross section that abuts on the other end surface 13b of the pedestal 13 across the upper wedge-shaped member 7. A jig 23.23 is a sheath pipe 17 of the flat plate member 8 and the lower wedge member 6. A PC steel rod/nut passes through I7 and connects the coupling plate 21 and the coupling jig 22, 24 is a center hole jack attached to the coupling jig 22 in the direction of the tapered surface, and 25 is a center hole jack for connecting the upper wedge-shaped member 7. There is a large diameter PCC frame rod that passes through the north pipe 16 and the center hole jack 24 and is fixed to the upper wedge-shaped member end and the sliding part end of the jack with nuts 26 and 26 at both ends.

Here, the hydraulic pressure required for the center hole jack 24 will be roughly estimated with reference to FIG. now,
Upper wedge-shaped member 7 from building IO via flat plate-shaped member 8
The force applied to is FI, the height is θ, and the coefficient of friction between steels is μ. Then, the reaction forces N+ and Nz acting in the normal direction of the upper and lower contact surfaces of the upper wedge-shaped member 7 are N + = F
+ , N 2 = F 2CO3θ = (P , +
W) cos θ, and the force P required to horizontally move the upper wedge-shaped member 7 is given by the following equation (1).

P-μN 10μN2 1μF, 10μ(F, +W)cosθ...(1)
F, = 100 tons, W = 0.1 tons, tanθ = 0
．． 1. μ-O,19, these values are expressed as above (1
), P = 37.9 tons, which shows that 40 tons of hydraulic pressure is sufficient. In addition, regarding the required stroke S of the interhole jack 24 above,
If the vertical elastic constant K of the isolator 4 is 800 tons/cm, the displacement ff1d of the isolator due to the building load F is d = F + / K = O, 125c71
And since tanθ-0,1, S = ! , 25c
It becomes z. That is, the upper wedge-shaped member 7 is horizontally 1.25 cm
If it is moved more than u, all the building load will be transferred to isolator 4.
Standing around the
Q l"'I Q n G 昭)1.-hz r\7.
, - becomes.

Regarding the method of replacing the seismic isolation device with the above configuration using the above-mentioned upper wedge-shaped member attachment/detachment device (see Figures 5 to 7),
Next, the description will be given in order with reference to FIG.

(a) A plurality of universal jacks 30, 30 are extended and erected between the foundation I around the base isolation device to be replaced and the building bottom 10.

(b) One end surface 13a of the flat plate member 8 and the lower wedge member 6
The connecting plate 21 is brought into contact with the other end surface 13b, and the joining jig 22 is brought into contact with the other end surface 13b, respectively, and these are connected together with a PC steel rod/Nand 23, 23.

(c) While fixing the center hole gloss 24 to the coupling jig 22 in the direction of the Taber surface, insert the PCB rod 2 into the center hole of the sheath pipe I6 of the upper wedge-shaped member 7 and the center pole jack 24. , NANDs 26 and 26 are screwed onto both ends of this PC steel rod 25 to connect them. Next, each member 6
, 7. Remove the connecting bolt 11 (see FIG. 9(a)) that connects the parts.

(d) Drive the center pole jack 24 in the direction shown by arrow C, and insert the wedge-shaped member 7 through the PC steel rod 25.
2 cyr in the direction shown by the arrow. Then, all the load of the building on the isolator 4 is supported by the universal jack 30, and the flat plate member 8
A gap is created between the upper wedge-shaped member 7 and the upper wedge-shaped member 7.

(e) After removing the center hole jack 24, coupling jig 22, coupling plate 21 and PC steel bar 25 and removing the upper wedge-shaped member 7, the bolt 5 is removed and the defective isolator 4 is removed.

(f) Next, a new isolator 4 is brought in and fixed in place with bolts 5, and then an upper (wedge-shaped member 7) is inserted between the flat plate-shaped member 8 and the lower wedge-shaped member 6.
A PC steel rod 25 is passed through the sheath tube 16 of the upper wedge-shaped member 7, and a nut 26 is screwed onto the other end surface 13b side.

(g) The other end surface 13b of the flat plate-shaped member 8 and the lower wedge-shaped member 6
The joining jig 22 is brought into contact with the joining jig 22, and the joining plate 21 is brought into contact with the one end 13a, respectively, and these are connected together with the PCC frame rod nuts 23 and 23.

(h) Pass the PCM rod 25 through the center hole, fix the center pole jack 24 to the coupling jig, and connect the PCB rods 2, 5, and 26 by screwing them together.

(i) Drive the center hole jack 24 to
The upper wedge-shaped member 7 is similarly drawn into position via the t21 rod 25, and each member 6, 7, 8 is connected with a connecting bolt ll. Thereafter, the center hole jack 2.1, the coupling jig 22, the coupling plate 21, and the PC feather rod 25 are removed, and the universal jack 30 is removed, completing the replacement of the seismic isolation device.

In the above embodiment, a device as shown in FIGS. 5 to 7 is used for attaching and detaching the upper wedge-shaped portion of the pedestal 13.
To easily and safely attach and detach an upper wedge-shaped member even when a large building load is applied. In addition, since the outer shell formed by each member 6, 7, 8 or steel plate 14 is filled with concrete 15, the frictional force is smaller than when it is made of concrete, so it can be pulled out and pulled in with a small force. Furthermore, it is lighter and cheaper to manufacture than when it is made only of steel. Figures 1O and 11 are a half-cut side view and a front view showing a modified example of the seismic isolation device. This seismic isolation device serves as a connecting means for integrating the flat plate-like member 8 and the upper and lower wedge-like members 7.6.
c, a connecting plate 31.31 brought into contact with 13d, and connecting bolts 32a, 32b connecting this connecting plate 3I to each member 6, 7.8.

The embodiment is the same as that of FIG. 1 except that 32c is used. Among the bolt holes 3 and 1 of the connecting plate 31, the bolt holes corresponding to the lower wedge-shaped member are elongated holes 35 extending in the vertical direction, as shown in FIG.
is screwed into the outer steel plate of each member 6, 7.8, and screwed into the internal thread. The bolts 33, 33 screwed onto the lower surface of the lower wedge-shaped member 6 are only for fixing to the isolator 4. When replacing the isolator 4 in this seismic isolation device, use the above-mentioned upper wedge-shaped member attachment/detachment device to replace the isolator 4.
After following the same steps as in Figures (a), (b), and (c), loosen the coupling bolt 32a and remove the coupling bolt 32.
b outside 1 puto 1. u +-/ 71g4 body soup full d
Press 1↓ and press 2 kl) Remove the above port 33, separate the lower wedge-shaped member and isolator 4, and replace it with a new isolator.
Following the procedure (i), finally the connecting bolt 32a,
32b should be tightened.

In the above modification, the long connecting bolt 11 as shown in FIG. 1 does not need to be inserted or removed from below, so that the replacement work is facilitated. In addition, since the lower wedge-shaped member 6 does not move together when the upper wedge-shaped member 7 is attached or detached, there is no need for the coupling jig 22 of the embodiment, and the upper wedge-shaped member 7 can be attached or detached by an appropriate means without the need for the coupling jig 22 of the embodiment. can.

In addition, in the above embodiments and modified examples, the upper and lower wedge-shaped members 6
, 7 and the flat plate-shaped member 8 as a connecting means for detachably integrating them, a through hole 12 or a bolt hole 34 is bored at a position where each member 6, 7.8 is aligned as shown in FIG. 1 or FIG. 1O. However, only the hole corresponding to the upper wedge-shaped member 7 should be aligned in the direction of the tapered surface! - The base isolation device may be drilled through the ground, thereby making it possible to adjust the height of the seismic isolation device against uneven settlement of the foundation 1.

<Effects of the Invention> As is clear from the above explanation, the seismic isolation device of the present invention consists of a laminated rubber isolator and a disassembly pedestal fixed to the upper or lower surface of the isolator, and is installed between the building and the foundation. The pedestal is interposed between a pair of wedge-shaped members that are slidably stacked on top of each other with their tapered surfaces in contact with each other, and is stacked on the horizontal surface of the wedge-shaped member on the side that is not fixed to the isolator. Alternatively, since it is equipped with a flat plate member fixed to the foundation and a connecting means that removably integrates the pair of wedge-shaped members and the flat plate member, if a problem occurs with the laminated rubber isolator, the building It is possible to simply and efficiently replace only the isolator part without having to make the entire surface glossy, and it is also possible to easily deal with uneven settlement of the foundation, etc., greatly contributing to the generalization of isolators.

[Brief explanation of drawings]

FIG. 1 is a half-sectional view showing an embodiment of the seismic isolation device of the present invention;
Figure 2 is a sectional view taken along ■-■ in Figure 1, and Figure 3 is a cross-sectional view taken along I-■ in Figure 1.
I[1 arrow view, Figure 4 is a ■-■ arrow view in Figure 1, Figure 5 is a side view of the upper wedge-shaped member attachment/detachment device, and Figure 6 is a Vl-Vl arrow view in Figure 5. Figure 7 is a view from the ■-■ arrow in Figure 5,
FIG. 8 is an explanatory diagram of the hydraulic pressure required for the jack in FIG. A half-sectional view showing a modified example of the seismic isolation device, FIG. 1I is a view taken along arrows XI-XI in FIG. 10, FIG. 12 is an explanatory diagram of the effect of the seismic isolation device, and FIG. 13(a)
-(e) are diagrams showing a method of replacing a conventional laminated rubber isolator. 1...Foundation, 2...Base plate, 3.9...Statton Hell, = 1, 4' - Laminated rubber isolator, 5 Porto, 6... Lower wedge-shaped member, 7...
- Upper wedge-shaped member, 8 - Flat plate-shaped member, IO... Bottom of building, 11 - Connection bolt, 12... Through hole, 13
cradle, 18.19 ・cap nut, 21... coupling plate,
22 Joining jig, 23... PCM rod/nut, 2.1
...Center pole jack, 25...PCNJ rod,
26...Natsuto, 30.Universal Jack, 31=
1 connection plate, 32a, 32b, 32c...connection bolt, 3
3. Port, 34. Bolt hole, 35. Long hole. Patent applicant: Precious Wood, Needle Point Haka I, Representative Patent Attorney, Aoshiro Aoki, and 2 others Figure 1, Figure 2, Figure 4

Claims (3)

[Claims] (1) An isolator consisting of a plurality of alternating layers of rubber or synthetic resin flat plates and metal flat plates, and a removable pedestal fixed to the top or bottom of the isolator. The seismic device includes a pair of wedge-shaped members stacked so as to be slidable with their tapered surfaces in contact with each other, and stacked on the horizontal surface of the wedge-shaped member on the side not fixed to the isolator. 1. A seismic isolation device comprising: a flat plate-like member fixed to an object or a foundation; and a connecting means for removably integrating the pair of wedge-shaped members and the flat plate-like member. (2) The seismic isolation device according to claim 1, wherein the pair of wedge-shaped members and the flat plate-shaped member are each provided with a through hole extending in the horizontal direction. (3) In the seismic isolation device according to claim 1 or 2, the connecting means comes into contact with both side surfaces of the pair of wedge-shaped member and flat plate member extending in the tapered surface direction. It consists of a connecting plate that is fixed, and a connecting bolt that connects each of the above members and the connecting plate, and at least one of the through holes of the connecting plate that corresponds to the flat plate member or the wedge-shaped member on the fixed side is vertical. A seismic isolation device characterized by a long hole extending in the direction.