JP2011132769A - Method of replacing laminated rubber for base isolation - Google Patents

Method of replacing laminated rubber for base isolation Download PDF

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JP2011132769A
JP2011132769A JP2009294628A JP2009294628A JP2011132769A JP 2011132769 A JP2011132769 A JP 2011132769A JP 2009294628 A JP2009294628 A JP 2009294628A JP 2009294628 A JP2009294628 A JP 2009294628A JP 2011132769 A JP2011132769 A JP 2011132769A
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laminated rubber
seismic isolation
flange
compression
foundation
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JP5417156B2 (en
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Shohei Onizuka
翔平 鬼塚
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Hitachi GE Nuclear Energy Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To easily replace a laminated rubber for base isolation in a building structure such as a nuclear power generation facility or the like without floating the upper structure by a supporting structure such as a jack and without using an additional facility such as timbering or the like. <P>SOLUTION: Compression bolts attached to the upper and lower flanges of the laminated rubber for base isolation are rotated using compression nuts to compress the laminated rubber for base isolation until a gap is provided between the laminated rubber for base isolation and an upper foundation. Since the gap is produced, the laminated rubber for base isolation can be removed. Then, a new laminated rubber for base isolation compressed by the compression bolts is disposed, and the compression is released to install a new laminated rubber for base isolation. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

本発明は、原子力発電施設等における建築構造物の基礎と上部構造物間に配置した免震用積層ゴムの取替え工法に関するものである。   The present invention relates to a method for replacing seismic isolation laminated rubber disposed between a foundation of a building structure and an upper structure in a nuclear power generation facility or the like.

近年、免震装置は、一般建築物から工業施設など様々な分野で実際に適用されている。特にゴムと鋼板を交互に積層した積層ゴムを用いた免震装置は、免震装置の中でも代表的なものである。高減衰ゴムや天然ゴムを用いた免震用積層ゴムは、半永久的にその効果を発揮するものではなく、上部構造物の加圧による弾性の劣化、空気、湿度、オゾン等の外部環境により免震用積層ゴムの劣化が生じる可能性がある。従って、免震用積層ゴムを定期的に取替える必要がある。その交換方法として、特許文献１のように上記建築構造物基礎と上記構造物間に複数のジャッキを配置し、各ジャッキを均等に伸張して上部構造物を若干浮かせ、その間に免震用積層ゴムを取替える工法が開示されている。   In recent years, seismic isolation devices are actually applied in various fields such as general buildings and industrial facilities. In particular, a seismic isolation device using laminated rubber in which rubber and steel plates are alternately laminated is a typical one among the seismic isolation devices. Seismic isolation laminated rubber using high-damping rubber or natural rubber does not exhibit its effect semipermanently, and is exempted by the external environment such as deterioration of elasticity due to pressurization of the superstructure, air, humidity, ozone, etc. Deterioration of seismic laminated rubber may occur. Therefore, it is necessary to replace the seismic isolation laminated rubber regularly. As a replacement method, a plurality of jacks are arranged between the building structure foundation and the structure as in Patent Document 1, and each jack is stretched evenly so that the upper structure is slightly lifted. A method of replacing rubber is disclosed.

また、特許文献２、特許文献３では、フランジ間に逆ねじを有するねじ棒を回転させて免震積層ゴムに予め荷重を加えて圧縮させ、建物に挿入する設置方法が開示されている。   Patent Document 2 and Patent Document 3 disclose an installation method in which a screw rod having a reverse screw between flanges is rotated, a seismic isolation laminated rubber is preliminarily applied with a load and compressed, and then inserted into a building.

特開平３−７６９７３号公報Japanese Patent Laid-Open No. 3-76973 特開平１０−２８０７０５号公報Japanese Patent Laid-Open No. 10-280705 特開平１１−１５２９３３号公報Japanese Patent Laid-Open No. 11-152933

特許文献１の免震用積層ゴムの取替え工法は、重量が大きな原子力発電施設においては、ジャッキにより上部構造物を浮かす場合に多数のジャッキが必要となる。また、特許文献２の取替え工法では、梁と基礎工の間に支保工を設けて、負荷荷重を負担させ、免震積層ゴムを圧縮して交換する。   The method of replacing the seismic isolation laminated rubber disclosed in Patent Document 1 requires a large number of jacks when the upper structure is lifted by jacks in a heavy nuclear power generation facility. Moreover, in the replacement method of patent document 2, a support work is provided between a beam and a foundation work, a load is borne, and a seismic isolation laminated rubber is compressed and replaced.

本発明は、ジャッキ等の大掛りな荷重支持構造により上部構造物を浮かすことなく、また、支保工等の付加的設備を用いることなく、原子力発電施設の免震用積層ゴムを容易に取替え可能にすることを目的とする。   The present invention makes it possible to easily replace the seismic isolation laminated rubber of a nuclear power generation facility without floating the superstructure with a large load support structure such as a jack, and without using additional equipment such as a support work. The purpose is to.

本発明は、上部構造物を載置した上部基礎と下部構造物に載置された下部基礎との間に、前記上部基礎に取付ボルトを介して取付けられた上部フランジ及び前記下部基礎に取付ボルトを介して取付けられた下部フランジを有する免震用積層ゴムを複数個取付けた免震装置を有する建築構造物における、前記免震用積層ゴムの一部を取替える建築構造物の免震用積層ゴム取替え工法において、前記取替え対象である一部の免震用積層ゴムの上部フランジ及び上部基礎間に取り付けられた取付ボルトを除去し、前記免震用積層ゴムの上部フランジ及び下部フランジに取り付けられた圧縮装置で前記免震用積層ゴムを圧縮し、前記免震用積層ゴムを圧縮した際に、前記上部基礎と下部基礎との間の間隔をほぼ一定に保ち、前記免震用積層ゴムの下部フランジ及び前記下部基礎間に取り付けられた取付ボルトを除去して前記免震用積層ゴムを取去り、前記圧縮装置にて圧縮した新たな免震用積層ゴムを据付けることを特徴とする。   The present invention provides an upper flange mounted on the upper foundation via a mounting bolt between an upper foundation on which the upper structure is placed and a lower foundation placed on the lower structure, and a mounting bolt on the lower foundation. In a building structure having a seismic isolation device having a plurality of seismic isolation laminated rubber having a lower flange attached via a base, a part of the seismic isolation laminated rubber is replaced. In the replacement method, the mounting bolts attached between the upper flange and the upper base of some of the seismic isolation laminated rubbers to be replaced were removed and attached to the upper flange and lower flange of the seismic isolation laminated rubber When the base rubber for compressing the seismic isolation is compressed by a compression device, and the base rubber for base isolation is compressed, the distance between the upper base and the lower base is kept substantially constant, and the lower part of the base rubber for base isolation is compressed. Lunge and said removing an attached mounting bolts between lower foundation deprived the seismic isolation laminate rubber, characterized in that installing a new seismic isolation laminate rubber compressed by the compression device.

また、建築構造物の免震用積層ゴム取替え工法において、前記圧縮装置を、前記上部フランジおよび下部フランジに設けられた圧縮ボルトと、該圧縮ボルトに両端でねじ嵌合し前記上部フランジおよび下部フランジの距離を短縮して前記免震用積層ゴムを圧縮する圧縮ナットから構成したことを特徴とする。   Further, in the seismic isolation laminated rubber replacement method for a building structure, the compression device includes a compression bolt provided on the upper flange and the lower flange, and a screw fit to the compression bolt at both ends, and the upper flange and the lower flange. It is characterized by comprising a compression nut that compresses the seismic isolation laminated rubber by shortening the distance.

また、建築構造物の免震用積層ゴム取替え工法において、前記圧縮装置を、前記上部フランジおよび下部フランジに設けられたリンクと、該リンクを回動させて前記上部フランジおよび下部フランジの距離を短縮して前記免震用積層ゴムを圧縮するリンク装置から構成したことを特徴とする。   Also, in the seismic isolation rubber replacement method for building structures, the compression device is linked to the links provided on the upper flange and the lower flange, and the distance between the upper flange and the lower flange is shortened by rotating the link. And it comprised from the link apparatus which compresses the said laminated rubber for seismic isolation.

さらに、建築構造物は原子力発電施設であることを特徴とする。   Furthermore, the building structure is a nuclear power generation facility.

本発明は、免震用積層ゴムを圧縮することで上部基礎と免震用積層ゴムの上部フランジ間に空間を作り、免震用積層ゴムを引き抜き、同様に圧縮した新たな免震用積層ゴムを挿入するだけでよいので、ジャッキ等の支持構造が不要でかつ構造物や基礎に損傷を与えることなく免震用積層ゴムを取替えることができる。   The present invention creates a space between the upper base and the upper flange of the base isolation rubber by compressing the base isolation rubber, pulls out the base isolation rubber, and compresses the new base rubber Therefore, it is not necessary to provide a support structure such as a jack, and the seismic isolation laminated rubber can be replaced without damaging the structure and the foundation.

本発明の実施例１の免震用積層ゴムの設置状態を示す正面図である。It is a front view which shows the installation state of the laminated rubber for seismic isolation of Example 1 of this invention. 本発明の実施例１の免震用積層ゴムを挟むフランジの平面図である。It is a top view of the flange which pinches | interposes the seismic isolation laminated rubber of Example 1 of this invention. 本発明の実施例１の免震用積層ゴムの圧縮状態を示す正面図である。It is a front view which shows the compression state of the laminated rubber for seismic isolation of Example 1 of this invention. 本発明の実施例２の免震用積層ゴムの圧縮状態を示す正面図である。It is a front view which shows the compression state of the laminated rubber for seismic isolation of Example 2 of this invention.

本発明の実施形態に関し、原子力発電施設を例にとって図面を参照して説明する。   An embodiment of the present invention will be described with reference to the drawings by taking a nuclear power generation facility as an example.

図１はこの発明が適用される実施例１の免震構造物の正面図、図２は本発明の免震用積層ゴムを挟むフランジの平面図、図３は免震用積層ゴムを圧縮状態とした正面図を示している。   FIG. 1 is a front view of a seismic isolation structure of Example 1 to which the present invention is applied, FIG. 2 is a plan view of a flange sandwiching the seismic isolation laminated rubber of the present invention, and FIG. 3 is a compressed state of the seismic isolation laminated rubber A front view is shown.

初めに、図１及び図２に関して説明する。実施例１の免震構造物は、原子力発電施設の上部構造物を載置した上部基礎１と、下部構造物に載置された下部基礎２、および両者の間に配置された免震用積層ゴム３から構成されている。免震用積層ゴム３は中心に、震動減衰用の鉛材等からなる振動減衰部材３Ａを有している。   First, a description will be given with reference to FIGS. The seismic isolation structure of Example 1 includes an upper foundation 1 on which an upper structure of a nuclear power generation facility is placed, a lower foundation 2 placed on a lower structure, and a seismic isolation stack disposed between the two. It is composed of rubber 3. The seismic isolation laminated rubber 3 has a vibration damping member 3A made of a lead material for damping vibration at the center.

免震用積層ゴム３は、上部フランジ４が上部基礎１に取付ボルト５により接合され、下部フランジ６が取付ボルト５により下部基礎２に接合されている。７は上部フランジ４と下部フランジ６に設けられた圧縮ボルト、８は圧縮ナット、９は圧縮ボルトを固定するロックナットである。圧縮ナット８は、上下に圧縮ボルト７とねじ嵌合する逆ねじ部を設けている。免震用積層ゴム３は、基礎間に設置された状態では上下方向の荷重を受け圧縮状態にある。   In the seismic isolation laminated rubber 3, the upper flange 4 is joined to the upper foundation 1 by the attachment bolt 5, and the lower flange 6 is joined to the lower foundation 2 by the attachment bolt 5. 7 is a compression bolt provided on the upper flange 4 and the lower flange 6, 8 is a compression nut, and 9 is a lock nut for fixing the compression bolt. The compression nut 8 is provided with a reverse screw portion that is screwed onto the compression bolt 7 at the top and bottom. The seismic isolation laminated rubber 3 is in a compressed state in response to a load in the vertical direction when installed between the foundations.

ここで取付ボルト５の上部基礎１、下部基礎２側の受け口はねじが切ってあり、取付ボルト５の取り外しにより前記基礎が損傷しない構造となっている。５Ａは上部フランジ４に設けた取付ボルト５用の貫通孔である。７Ａは圧縮ボルト７を固定するねじ孔である。下部フランジ６も同一構造を有する。   Here, the receiving holes on the upper base 1 and the lower base 2 side of the mounting bolt 5 are threaded, and the base is not damaged by the removal of the mounting bolt 5. Reference numeral 5 </ b> A denotes a through hole for the mounting bolt 5 provided in the upper flange 4. 7A is a screw hole for fixing the compression bolt 7. The lower flange 6 also has the same structure.

このような免震積層ゴムの取替えは以下の方法にて行う。まず、上部基礎１と上部フランジ４を結合している取付ボルト５を取り外し、下部フランジ６に着脱可能な圧縮ボルト７、ロックナット９及び圧縮ナット８を設置する。次に、上部フランジ６に着脱可能な圧縮ボルト７及びロックナット９を設置する。圧縮ナット８により、上部フランジ及び下部フランジに取り付けた圧縮ボルト７を接続させ、圧縮ナット８を回転させて免震用積層ゴム３を圧縮する。ここで、ロックナット９は圧縮ボルト７の空回りを防止するため、圧縮ボルト７に取り付ける。   The replacement of such seismic isolation laminated rubber is performed by the following method. First, the mounting bolt 5 that joins the upper foundation 1 and the upper flange 4 is removed, and the detachable compression bolt 7, the lock nut 9, and the compression nut 8 are installed on the lower flange 6. Next, the detachable compression bolt 7 and the lock nut 9 are installed on the upper flange 6. The compression nuts 8 attached to the upper flange and the lower flange are connected by the compression nut 8, and the compression nut 8 is rotated to compress the seismic isolation laminated rubber 3. Here, the lock nut 9 is attached to the compression bolt 7 in order to prevent the compression bolt 7 from spinning around.

上部フランジの圧縮ボルト７は右ねじ、下部フランジに取り付けた圧縮ボルト７は左ねじにすることで、圧縮ナット８を右周りに回転させることにより、上部フランジの圧縮ボルト７は下方向に移動し、下部フランジの圧縮ボルト７は上方向に移動し、免震用積層ゴム３は圧縮される。   The compression bolt 7 of the upper flange is a right-hand screw, and the compression bolt 7 attached to the lower flange is a left-hand screw. By rotating the compression nut 8 clockwise, the compression bolt 7 of the upper flange moves downward. The compression bolt 7 of the lower flange moves upward, and the seismic isolation laminated rubber 3 is compressed.

前記免震用積層ゴムを圧縮した状態を図３に示す。原子力発電所施設に免震用積層ゴム３を設置する場合、原子力発電所施設は耐震性能や遮へい性能について高い安全性を確保する必要があるため、施設の質量が大きくなり、施設の質量を支持するために免震用積層ゴム３を多数設置する必要があり、例えば直径１６００ｍｍ前後の数百個の免震用積層ゴム３を設置する必要がある。   FIG. 3 shows a state in which the seismic isolation laminated rubber is compressed. When installing laminated rubber 3 for seismic isolation in a nuclear power plant facility, the nuclear power plant facility needs to ensure high safety with respect to seismic performance and shielding performance, which increases the mass of the facility and supports the mass of the facility In order to do this, it is necessary to install a large number of seismic isolation laminated rubbers 3, for example, it is necessary to install several hundreds of seismic isolation laminated rubbers 3 having a diameter of about 1600 mm.

ここで、免震用積層ゴム３を取替える場合に、対象となる１基の免震用積層ゴム３を圧縮させたとしても、その他の免震用積層ゴム３に作用する原子力発電所施設の荷重増加は微小であり、上部基礎１と下部基礎２の間隔はほとんど変わらない。したがって、取替えの対象となる免震用積層ゴム３を１基毎に圧縮させた場合でも、免震用積層ゴム３の上部フランジ４と上部基礎１の間に空間を確保することが可能となる。   Here, when replacing the seismic isolation laminated rubber 3, even if one target seismic isolation laminated rubber 3 is compressed, the load of the nuclear power plant facility acting on the other seismic isolation laminated rubber 3 The increase is very small, and the distance between the upper foundation 1 and the lower foundation 2 hardly changes. Therefore, even when the seismic isolation laminated rubber 3 to be replaced is compressed one by one, a space can be secured between the upper flange 4 and the upper foundation 1 of the seismic isolation laminated rubber 3. .

上部基礎１と免震用積層ゴム３間に空間を確保し、下部フランジ６と下部基礎２を結合している取付ボルト５を取り外すことにより、小型のフォークリフト等を使用することで圧縮させた免震用積層ゴム３を取り出すことが可能となる。   A space between the upper foundation 1 and the seismic isolation laminated rubber 3 is secured, and by removing the mounting bolt 5 that joins the lower flange 6 and the lower foundation 2, it is compressed by using a small forklift or the like. The seismic laminated rubber 3 can be taken out.

さらに、前記圧縮ボルト、圧縮ナットにてあらかじめ圧縮された新規免震積層ゴムを下部フランジ６の取付ボルト５により下部基礎６に据付け、圧縮ナット８を圧縮ボルト７のまわりに左回りに回転させて免震用積層ゴム３の圧縮を解除し、接触した上部フランジ４と上部基礎１を取付ボルト５により固定する。   Further, a new seismic isolation laminated rubber pre-compressed with the compression bolt and the compression nut is installed on the lower foundation 6 by the mounting bolt 5 of the lower flange 6, and the compression nut 8 is rotated counterclockwise around the compression bolt 7. The compression of the seismic isolation laminated rubber 3 is released, and the contacted upper flange 4 and upper base 1 are fixed by the mounting bolts 5.

以上により、圧縮ボルト７及び圧縮ボルト８により免震用積層ゴム３を圧縮させることで、ジャッキ等の大掛りな荷重支持構造を用いることなく免震用積層ゴム３と、上部基礎１の間に空間を確保することができ、容易に免震用積層ゴムの取替えが可能となる。   As described above, by compressing the seismic isolation laminated rubber 3 with the compression bolt 7 and the compression bolt 8, the seismic isolation laminated rubber 3 and the upper foundation 1 are not used without using a large load support structure such as a jack. Space can be secured and the laminated rubber for seismic isolation can be easily replaced.

図４は、本発明の実施例２の正面図である。実施例２は、免震用積層ゴム４の圧縮装置として、リンク１１と、ロックレバー１２を有するリンク装置１０を用いる。リンク装置１０は免震用積層ゴム４の周囲のほぼ対称位置に適当な個数を設ける。ロックレバー１２を回動させてリンク１１がデッドポイントを越えるとロックがなされる。実施例２の構成は比較的軽荷重の場合に適しているが、操作性がよく、迅速な作業を要求される様な箇所において有効に用いられる。   FIG. 4 is a front view of Embodiment 2 of the present invention. Example 2 uses a link device 10 having a link 11 and a lock lever 12 as a compression device for the seismic isolation laminated rubber 4. An appropriate number of link devices 10 are provided at substantially symmetrical positions around the seismic isolation laminated rubber 4. When the lock lever 12 is rotated and the link 11 exceeds the dead point, the lock is made. The configuration of the second embodiment is suitable for a relatively light load, but has good operability and is effectively used in a place where a quick work is required.

１…上部基礎、２…下部基礎、３…免震用積層ゴム、４…上部フランジ、５…取付ボルト、６…下部フランジ、７…圧縮ボルト、８…圧縮ナット、９…ロックナット、１０…リンク装置、１１…リンク、１２…ロックレバー DESCRIPTION OF SYMBOLS 1 ... Upper foundation, 2 ... Lower foundation, 3 ... Seismic isolation laminated rubber, 4 ... Upper flange, 5 ... Mounting bolt, 6 ... Lower flange, 7 ... Compression bolt, 8 ... Compression nut, 9 ... Lock nut, 10 ... Link device, 11 ... link, 12 ... lock lever

Claims (4)

上部構造物を載置した上部基礎と下部構造物に載置された下部基礎との間に、前記上部基礎に取付ボルトを介して取付けられた上部フランジ及び前記下部基礎に取付ボルトを介して取付けられた下部フランジを有する免震用積層ゴムを複数個取付けた免震装置を有する建築構造物における、前記免震用積層ゴムの一部を取替える免震用積層ゴムの取替え工法において、
前記取替え対象である一部の免震用積層ゴムの上部フランジ及び上部基礎間に取り付けられた取付ボルトを除去し、
前記免震用積層ゴムの上部フランジ及び下部フランジ間に取り付けられた圧縮装置で前記免震用積層ゴムを圧縮し、
前記免震用積層ゴムを圧縮した際に、前記上部基礎と下部基礎との間の間隔をほぼ一定に保ち、
前記免震用積層ゴムの下部フランジ及び前記下部基礎間に取り付けられた取付ボルトを除去して前記免震用積層ゴムを取去り、
前記圧縮装置にて圧縮した新たな免震用積層ゴムを据付ける
ことを特徴とする免震用積層ゴムの取替え工法。 An upper flange attached to the upper foundation via a mounting bolt and an attachment bolt to the lower foundation between the upper foundation on which the upper structure is placed and the lower foundation placed on the lower structure. In a building structure having a seismic isolation device having a plurality of seismic isolation laminated rubber having a lower flange formed, in the replacement method of the seismic isolation laminated rubber for replacing a part of the seismic isolation laminated rubber,
Remove the mounting bolts attached between the upper flange and the upper foundation of some seismic isolation laminated rubber that is the replacement target,
Compressing the seismic isolation rubber with a compression device attached between the upper flange and the lower flange of the base isolation rubber,
When compressing the seismic isolation laminated rubber, the distance between the upper foundation and the lower foundation is kept substantially constant,
Removing the mounting bolts attached between the lower flange of the seismic isolation laminated rubber and the lower foundation, and removing the seismic isolation laminated rubber;
A replacement method for a seismic isolation laminated rubber, wherein a new seismic isolation laminated rubber compressed by the compression device is installed. 請求項１に記載された建築構造物の免震用積層ゴム取替え工法において、前記圧縮装置は、前記上部フランジおよび下部フランジに設けられた圧縮ボルトと、該圧縮ボルトに両端でねじ嵌合し前記上部フランジおよび下部フランジの距離を短縮して前記免震用積層ゴムを圧縮する圧縮ナットを有することを特徴とする免震用積層ゴムの取替え工法。   2. The method of claim 1, wherein the compression device includes a compression bolt provided on the upper flange and the lower flange, and a screw-fitting to the compression bolt at both ends. A method of replacing a base-isolated laminated rubber, comprising a compression nut that compresses the base-isolated laminated rubber by shortening the distance between the upper flange and the lower flange. 請求項１に記載された建築構造物の免震用積層ゴム取替え工法において、前記圧縮装置は、前記上部フランジおよび下部フランジに設けられたリンクと、該リンクを回動させて前記上部フランジおよび下部フランジの距離を短縮して前記免震用積層ゴムを圧縮するリンク装置を有することを特徴とする免震用積層ゴムの取替え工法。   2. The method of claim 1, wherein the compression device includes a link provided on the upper flange and the lower flange, and rotates the link to rotate the upper flange and the lower flange. A replacement method for seismic isolation laminated rubber, comprising a link device that compresses the seismic isolation laminated rubber by shortening the distance of the flange. 請求項１乃至３に記載された建築構造物の免震用積層ゴム取替え工法において、前記建築構造物は原子力発電施設であることを特徴とする免震用積層ゴムの取替え工法。   4. A method for replacing a laminated rubber for seismic isolation according to claim 1, wherein the building structure is a nuclear power generation facility.
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