JP2750519B2 - How to lower the bottom plate of the low temperature tank - Google Patents
How to lower the bottom plate of the low temperature tankInfo
- Publication number
- JP2750519B2 JP2750519B2 JP34810695A JP34810695A JP2750519B2 JP 2750519 B2 JP2750519 B2 JP 2750519B2 JP 34810695 A JP34810695 A JP 34810695A JP 34810695 A JP34810695 A JP 34810695A JP 2750519 B2 JP2750519 B2 JP 2750519B2
- Authority
- JP
- Japan
- Prior art keywords
- bottom plate
- inner tank
- tank bottom
- center hole
- nut
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、低温タンクの底部
保冷材上に仮設した架台上で溶接及び非破壊検査を実施
した内槽底板を、複数のワイヤを介して底部保冷材の上
面まで下降させる内槽底板下降方法に関し、特に、複数
のセンターホールジャッキを適用してワイヤを送出し
て、内槽底板を下降させる方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of lowering an inner tank bottom plate, which has been subjected to welding and nondestructive inspection on a tentatively mounted base on a cold insulator at the bottom of a low-temperature tank, to a top surface of the cold insulator through a plurality of wires. More particularly, the present invention relates to a method of applying a plurality of center hole jacks to send out wires to lower the inner tank bottom plate.
【０００２】[0002]
【従来の技術】従来、ＬＮＧ、ＬＰＧ等を貯留する為の
内外槽からなる２重殻の低温タンクにおいては、タンク
使用時の液漏れが生じないように、その組立てと検査が
慎重に行なわれるが、特に内槽底板は多数の鋼板を溶接
接合して構成し、その溶接個所には上下両面からの突合
せ溶接が施され、溶接線の全線に亙ってＸ線等による非
破壊検査が施される。内槽底板を組立てる場合、外槽底
板、外槽側板、内外槽屋根、底部保冷材、内槽底板の最
外周部のアニュラー底板及び内槽側板を組立てた後、底
部保冷材上に所定の高さの架台を仮設し、その架台上で
内槽底板の溶接及び非破壊検査を実施してから、上方の
タンク構造部材に連結した多数のワイヤを介して内槽底
板を支持した状態で架台を撤去してから内槽底板を底部
保冷材の上面まで下降させる。2. Description of the Related Art Conventionally, in a double-shell low-temperature tank comprising an inner and outer tank for storing LNG, LPG, etc., assembly and inspection are carefully performed so as not to cause liquid leakage when the tank is used. However, in particular, the inner tank bottom plate is constructed by welding and joining a number of steel plates, and butt welding is performed on the welding points from both the upper and lower surfaces, and non-destructive inspection using X-ray etc. is performed over the entire welding line. Is done. When assembling the inner tank bottom plate, after assembling the outer tank bottom plate, the outer tank side plate, the inner and outer tank roof, the bottom cold insulator, the outermost outer bottom plate of the inner tank bottom plate and the inner tank side plate, a predetermined height is placed on the bottom cold insulator. After temporarily mounting a gantry and performing welding and nondestructive inspection of the inner tank bottom plate on the gantry, the gantry is supported while supporting the inner tank bottom plate via a number of wires connected to the upper tank structural members. After removal, lower the inner tank bottom plate to the upper surface of the bottom cold insulator.
【０００３】内槽底板を底部保冷材の上面まで下降させ
る方法として、エアレイジングを適用する場合もある
が、安全性と確実性の観点から、多数のワイヤで内槽底
板を吊持した状態で内槽底板を下降させる方法が広く採
用されている。例えば、本出願人は、特公昭６３−０６
３７０４号公報に記載の低温タンクの内槽底板施工方法
において、多数のワイヤに夫々対応する多数のサーボモ
ータ又はセンターホール型油圧ジャッキを適用した内槽
底板下降方法を提案した。[0003] As a method of lowering the inner tank bottom plate to the upper surface of the bottom cold insulator, air-raising may be applied. However, from the viewpoint of safety and reliability, the inner tank bottom plate is hung by a large number of wires. The method of lowering the inner tank bottom plate is widely adopted. For example, the present applicant has disclosed Japanese Patent Publication No. 63-06 / 1988.
In the method of lowering the inner tank bottom plate of the low-temperature tank described in Japanese Patent No. 3704, a method of lowering the inner tank bottom plate using a large number of servomotors or center hole hydraulic jacks respectively corresponding to a large number of wires has been proposed.
【０００４】サーボモータを適用した内槽底板下降方法
においては、複数のワイヤの一端部を内槽側板の頂部に
固定するとともに、内槽底板の上面に固定された補強材
に、ワイヤを巻回する複数のウインチドラムと、ウイン
チドラムを回動するサーボモータとを配設し、ワイヤの
仰角に応じた所定のワイヤ送り量に基いて、制御装置で
各サーボモータを駆動制御してウインチドラムを回転さ
せて、内槽底板を水平状態に保持して下降させる。しか
し、この方法では、高価なサーボモータを多数必要とな
ること、制御装置も複雑化すること等から、設備コスト
が非常に高くなるという問題がある。In a method of lowering the inner tank bottom plate to which a servomotor is applied, one end of each of a plurality of wires is fixed to the top of the inner tank side plate, and the wires are wound around a reinforcing member fixed to the upper surface of the inner tank bottom plate. A plurality of winch drums and a servo motor for rotating the winch drum are provided, and the control device drives and controls each servo motor based on a predetermined wire feed amount according to the elevation angle of the wire to control the winch drum. Rotate to lower the inner tank bottom plate while keeping it horizontal. However, this method requires a large number of expensive servomotors, complicates the control device, and has a problem that the equipment cost is extremely high.
【０００５】一方、センターホール型油圧ジャッキを適
用した内槽底板下降方法においては、一端部が内槽側板
の頂部に固定された複数のワイヤの各々の他端部に所定
長さのロッドを連結し、このロッドをセンターホール型
油圧ジャッキに挿通させて、その油圧ジャッキでロッド
を移動駆動する。このセンターホール型油圧ジャッキと
しては、２つの油圧ジャッキを直列状に一体化し、夫々
ピストンとスプリングと協働する２組のコレットでロッ
ドを交互に噛んで尺取り虫的に駆動する複雑な構造のダ
ブルシリンダ式センターホール型油圧ジャッキ（以下、
ダブルシリンダジャッキと言う）が適用される。On the other hand, in the method of lowering the inner tank bottom plate to which a center hole type hydraulic jack is applied, a rod of a predetermined length is connected to the other end of each of a plurality of wires having one end fixed to the top of the inner tank side plate. Then, the rod is inserted into a center hole type hydraulic jack, and the rod is moved and driven by the hydraulic jack. This center-hole type hydraulic jack is a double cylinder with a complicated structure in which two hydraulic jacks are integrated in series and each rod is alternately bitten by two sets of collets that cooperate with a piston and a spring to drive like a worm. Type center hole type hydraulic jack (hereinafter,
Double cylinder jack) is applied.
【０００６】[0006]
【発明が解決しようとする課題】しかし、前記ダブルシ
リンダジャッキを適用した内槽底板下降方法において
は、内槽底板を水平状態を保持して下降させる為に、内
槽底板を吊下げるワイヤの仰角によりワイヤの送出量を
夫々調節する必要があるが、ダブルシリンダジャッキに
よる１サイクルのロッドの移動量が一定値であるので、
何台かのダブルシリンダジャッキを、何回かに１度空送
りして調整する必要があった。また、２つの油圧ジャッ
キを装備し複雑な構造の高価なダブルシリンダジャッキ
を多数必要とするので、内槽底板を下降させる設備コス
トが非常に高くなる。しかも、ダブルシリンダジャッキ
では、その内部のコレットがロッドを強く噛んだ状態で
ロック状態となることも多く、ダブルシリンダジャッキ
取替の為に作業が中断してしまうという問題もある。However, in the method for lowering the inner tank bottom plate to which the double cylinder jack is applied, in order to lower the inner tank bottom plate while keeping the horizontal state, the elevation angle of the wire for suspending the inner tank bottom plate. It is necessary to adjust the wire feed amount respectively, but since the amount of movement of the rod in one cycle by the double cylinder jack is a constant value,
It was necessary to adjust several double cylinder jacks by sending them once every several times. Further, since a large number of expensive double cylinder jacks having a complicated structure equipped with two hydraulic jacks are required, the equipment cost for lowering the inner tank bottom plate becomes extremely high. In addition, the double cylinder jack is often locked when the collet in the double cylinder jack strongly bites the rod, and there is a problem that the work is interrupted due to the replacement of the double cylinder jack.
【０００７】本発明の目的は、低温タンクの内槽底板下
降方法において、簡単な構造の１シリンダ式のセンター
ホール型油圧ジャッキを適用可能にすること、各ワイヤ
の送出し量を自由に設定可能にすること、油圧ジャッキ
のロックに起因する作業中断を解消すること、内槽底板
を下降させるのに必要な設備コストを低減すること、等
である。An object of the present invention is to make it possible to apply a simple one-cylinder center hole type hydraulic jack having a simple structure in the method of lowering the inner tank bottom plate of a low-temperature tank, and to be able to freely set the feed amount of each wire. Elimination of work interruption due to lock of the hydraulic jack, reduction of equipment cost required for lowering the inner tank bottom plate, and the like.
【０００８】[0008]
【課題を解決するための手段】請求項１の低温タンクの
内槽底板下降方法は、低温タンクの底部保冷材上に仮設
した架台上で内槽底板の溶接及び非破壊検査を実施して
から、内槽底板よりも上方のタンク構造部材に一端を連
結した複数のワイヤを介して内槽底板を支持した状態に
おいて架台を撤去し、複数のワイヤを介して内槽底板を
底部保冷材の上面まで下降させる内槽底板下降方法にお
いて、内槽底板の上面に補強材を取付けて固定するとと
もに、各ワイヤの他端部に連結されたネジ棒部材を、補
強材に固定されたセンターホールジャッキのセンターホ
ールと、センターホールジャッキに対してセンターホー
ルジャッキのラムの進出側に所定距離離隔させて補強材
に固定された支持ブラケットの挿通穴とに挿通させ、各
ネジ棒部材のうちのセンターホールジャッキと支持ブラ
ケットとの間の部分に螺合させた第１ナットを、ラムの
先端に係止させてラムを退入させる状態と、ネジ棒部材
のうちの支持ブラケットに対してセンターホールジャッ
キと反対側の部分に螺合させた第２ナットを、支持ブラ
ケットに係止させてラムを進出させる状態とに交互に切
換えながら、第１，第２ナットの位置を順々に切換えて
内槽底板を下降させるものである。According to a first aspect of the present invention, there is provided a method for lowering the inner tank bottom plate of the low temperature tank, wherein the welding and the nondestructive inspection of the inner tank bottom plate are carried out on a tentatively mounted base on the cold insulator at the bottom of the low temperature tank. The gantry is removed in a state where the inner tank bottom plate is supported via a plurality of wires connected at one end to the tank structural member above the inner tank bottom plate, and the inner tank bottom plate is connected to the upper surface of the bottom cold insulator through the plurality of wires. In the method for lowering the inner tank bottom plate, the reinforcing member is attached to the upper surface of the inner tank bottom plate and fixed, and the screw rod member connected to the other end of each wire is fixed to the center hole jack fixed to the reinforcing member. The center hole and the center hole jack are inserted through the insertion hole of the support bracket fixed to the reinforcing member at a predetermined distance on the side of the ram advancement of the center hole jack. A state in which the first nut screwed into a portion between the center hole jack and the support bracket is engaged with the tip of the ram to retract the ram; While alternately switching the second nut screwed to the portion opposite to the jack to the state in which the ram is advanced by engaging with the support bracket, the positions of the first and second nuts are sequentially switched to change the inner position. The tank bottom plate is lowered.
【０００９】複数のワイヤの各々の一端部が内槽底板よ
りも上方のタンク構造部材に連結され、各ワイヤは内槽
底板の上面まで延びて複数のシーブを介してネジ棒部材
と平行になり、各ワイヤの他端部はネジ棒部材に連結さ
れ、内槽底板を支持する荷重が複数のネジ棒部材に作用
する。内槽底板を下降させる場合、複数のワイヤの各々
に連結された各ネジ棒部材において、第２ナットを支持
ブラケットに係止させた状態で、第１ナットをラムの最
大進出ストローク、若しくはそれより短いストロークに
相当する距離だけ支持ブラケット側に移動させてから、
ラムを進出させてラムの先端で第１ナットを係止した
後、第２ナットを支持ブラケットから離隔する方向へ設
定量Ｓだけ移動させる。One end of each of the plurality of wires is connected to a tank structural member above the inner tank bottom plate, and each wire extends to the upper surface of the inner tank bottom plate and is parallel to the screw rod member via a plurality of sheaves. The other end of each wire is connected to a screw rod member, and a load for supporting the inner tank bottom plate acts on the plurality of screw rod members. When lowering the inner tank bottom plate, in each screw bar member connected to each of the plurality of wires, with the second nut locked to the support bracket, the first nut is moved to the maximum advance stroke of the ram, or After moving to the support bracket side by a distance equivalent to a short stroke,
After the ram is advanced and the first nut is locked at the tip of the ram, the second nut is moved by a set amount S in a direction away from the support bracket.
【００１０】この設定量Ｓは、ネジ棒部材に連結された
ワイヤの内槽底板に対する仰角Ａに応じてネジ棒部材毎
に設定される。次に、センターホールジャッキの油圧を
徐々に開放し、第１ナットをラムの先端に係止させた状
態でラムを退入させると、ネジ棒部材が設定量Ｓだけ移
動してワイヤが設定量Ｓだけ送出され、内槽底板は、設
定量Ｓ×ｓｉｎ（Ａ）だけ下降し、第２ナットが支持ブ
ラケットに係止された状態になる。以下、前記同様に多
数回繰り返すことにより、内槽底板を底部保冷材の上面
まで下降させることができる。The set amount S is set for each screw rod member according to the elevation angle A of the wire connected to the screw rod member with respect to the inner tank bottom plate. Next, when the hydraulic pressure of the center hole jack is gradually released and the ram is retracted with the first nut locked on the tip of the ram, the screw rod member moves by the set amount S, and the wire is moved by the set amount. S is sent out, the inner tank bottom plate is lowered by the set amount S × sin (A), and the second nut is locked by the support bracket. Hereinafter, by repeating the above many times, the inner tank bottom plate can be lowered to the upper surface of the bottom cold insulator.
【００１１】請求項２の低温タンクの内槽底板下降方法
は、ネジ棒部材として、鉄筋コンクリートに用いられる
鉄筋用棒材（ＰＣ鋼棒）を適用し、第１，第２ナットと
して鉄筋用棒材（ＰＣ鋼棒）に螺合するナット部材を適
用するものである。即ち、鉄筋用棒材（ＰＣ鋼棒）とナ
ット部材を適用することで、内槽底板を下降させる設備
コストを低減できる。According to a second aspect of the present invention, in the method of lowering the bottom plate of the inner tank of the low-temperature tank, a bar for reinforcing steel (PC steel bar) used for reinforced concrete is used as the threaded rod member, and a bar for reinforcing steel is used as the first and second nuts. (PC steel rod) is applied with a nut member. That is, by using the bar material for reinforcing bars (PC steel bar) and the nut member, the equipment cost for lowering the inner tank bottom plate can be reduced.
【００１２】[0012]
【発明の実施の形態】以下、本発明の実施の形態につい
て図面を参照しつつ説明する。本実施形態は、低温タン
クの底部保冷材上に仮設した架台上で内槽底板の溶接及
び非破壊検査を実施した後、内槽底板を底部保冷材の上
面まで下降させる内槽底板下降方法に、本発明を適用し
た場合の一例である。図１は、建造途中の低温タンク１
を示しているが、低温タンク１を建造する場合、先ず、
基礎コンクリート２と、その上に一体的に立設されるコ
ンクリート製の円筒形の防液堤３とを構築し、防液堤３
の内部において基礎コンクリート２の上面に低温用鋼又
は普通鋼の外槽底板４を組立てるとともに、この外槽底
板４の外周近傍部から立上がる普通鋼製の外槽側板５を
防液堤３の内壁面に組立てる。Embodiments of the present invention will be described below with reference to the drawings. This embodiment is a method of lowering the inner tank bottom plate in which the inner tank bottom plate is welded and nondestructively inspected on a gantry temporarily provided on the bottom cold insulator of the low temperature tank, and then the inner tank bottom plate is lowered to the upper surface of the bottom cold insulator. This is an example in which the present invention is applied. Figure 1 shows a low temperature tank 1 during construction
However, when constructing the low-temperature tank 1, first,
A foundation concrete 2 and a concrete cylindrical liquid barrier 3 erected integrally therewith are constructed, and the liquid barrier 3
Inside the base concrete 2, an outer tank bottom plate 4 made of low-temperature steel or ordinary steel is assembled on the upper surface of the basic concrete 2, and an outer tank side plate 5 made of ordinary steel rising from the vicinity of the outer periphery of the outer tank bottom plate 4 is attached to the liquid barrier 3. Assemble on the inner wall.
【００１３】次に、外槽側板５の内部の底面側におい
て、低温用鋼製の内槽屋根６と普通鋼製の外槽屋根７と
を組立て、内槽屋根６と外槽屋根７とを複数の吊り部材
で連結するとともに、外槽屋根７の外周部と外槽側板５
間をシールした後、外槽側板５内部に加圧エアを充填し
エアレイジングで内槽屋根６と外槽屋根７とを外槽側板
５の上端へ上昇させ、外槽屋根７を外槽側板５の上端部
に溶接接合する。尚、内槽屋根６と外槽屋根７の頂部に
は、配管系や計測系やアクセス通路等の為のマンホール
６ａ，７ａが形成される。Next, an inner tank roof 6 made of low-temperature steel and an outer tank roof 7 made of ordinary steel are assembled on the bottom side inside the outer tank side plate 5, and the inner tank roof 6 and the outer tank roof 7 are assembled. It is connected by a plurality of suspension members, and the outer peripheral portion of the outer tank roof 7 and the outer tank side plate 5
After the gap is sealed, pressurized air is filled into the outer tank side plate 5 and the inner tank roof 6 and the outer tank roof 7 are raised to the upper end of the outer tank side plate 5 by air lasing, and the outer tank roof 7 is moved to the outer tank side plate. 5 is welded to the upper end. In addition, manholes 6a and 7a for a piping system, a measurement system, an access passage, and the like are formed at the top of the inner tank roof 6 and the outer tank roof 7.
【００１４】次に、外槽底板４の上面に発泡コンクリー
トや発泡ガラス等からなる底部保冷材８を施工してか
ら、低温用鋼製の内槽底板の外周側部分である低温用鋼
製のアニュラー内槽底板部１１ａを環状に組立て、その
アニュラー内槽底板部１１ａの外周部から立上がる低温
用鋼製の内槽側板９を組立て、外槽屋根７と一体的に上
昇させた内槽屋根６を内槽側板９の上端部に溶接接合す
る。Next, a bottom insulating material 8 made of foam concrete, foamed glass, or the like is applied to the upper surface of the outer tank bottom plate 4 and then a low-temperature steel bottom plate made of a low-temperature steel bottom plate is formed. Annular inner tank bottom plate 11a is assembled in a ring shape, low temperature steel inner tank side plate 9 rising from the outer peripheral portion of annular inner tank bottom plate 11a is assembled, and inner tank roof 7 is integrally raised with outer tank roof 7. 6 is welded to the upper end of the inner tank side plate 9.
【００１５】前記内槽側板９の組立てとほぼ並行して、
内槽底板１１の組立てが実行されるが、その場合、底部
保冷材上８に、作業者の通過、諸作業可能な高さ（例え
ば、１〜２ｍ）の複数の架台１０を仮設し、架台１０上
で低温用鋼製の内槽底板１１の溶接及び非破壊検査を実
施し、以下に説明する内槽底板下降方法によって、複数
の架台１０を撤去して内槽底板１１を底部保冷材８の上
面まで下降させ、その下降させた内槽底板１１の外周を
アニュラー内槽底板部１１ａの内周に溶接接合し、その
円状の溶接線の非破壊検査を実施して内槽底板が組立て
られる。Almost in parallel with the assembly of the inner tank side plate 9,
The assembling of the inner tank bottom plate 11 is performed. In this case, a plurality of pedestals 10 having a height (for example, 1 to 2 m) at which a worker can pass and perform various operations are temporarily provided on the bottom cold insulator 8. Welding and nondestructive inspection of the inner tank bottom plate 11 made of low-temperature steel are performed on the lower tank 10, and a plurality of pedestals 10 are removed by the lowering method of the inner tank bottom plate described below, and the inner tank bottom plate 11 is replaced with the bottom cold insulator 8. The outer periphery of the lowered inner tank bottom plate 11 is welded to the inner periphery of the annular inner tank bottom plate portion 11a, and a non-destructive inspection of the circular welding line is performed to assemble the inner tank bottom plate. Can be
【００１６】次に、内槽底板下降方法について説明す
る。先ず、内槽底板下降に用いる装置について説明する
と、図２に示すように、内槽底板１１の上面に、例え
ば、周方向に１２°間隔で径方向に延びる３０本の主補
強骨１２と３０本の副補強骨１３を取付けて固定すると
ともに、周方向の第１〜第４環状補強骨１４〜１７を径
方向に所定間隔空けて取付けて固定する。次に、内槽底
板１１の中心まで延びない主補強骨１２と第１環状補強
骨１４との連結部分例えば２０箇所を第１吊点２０に、
主補強骨１２と第２環状補強骨１５との連結部分例えば
３０箇所を第２吊点４０に、主補強骨１２及び副補強骨
１３と第３環状補強骨１６との連結部分例えば６０箇所
を第３吊点４５に、主補強骨１２及び副補強骨１３と第
４環状補強骨１７との連結部分例えば６０箇所を第４吊
点５０に設定し、各吊点にシーブ２２，４２，４７を夫
々取付ける（図３〜図５参照）。尚、前記補強骨１２〜
１７は、内槽底板１１の下降完了後に取り外す仮設の補
強骨であるが、補強骨１２〜１７の代わりに、内槽底板
１１に恒久的に取付けた補強骨を用いてもよい。Next, a method of lowering the inner tank bottom plate will be described. First, an apparatus used for lowering the inner tank bottom plate will be described. As shown in FIG. 2, for example, 30 main reinforcing bones 12 and 30 extending radially at 12 ° intervals in the circumferential direction are provided on the upper surface of the inner tank bottom plate 11. The secondary reinforcing bones 13 are mounted and fixed, and the first to fourth annular reinforcing bones 14 to 17 in the circumferential direction are mounted and fixed at predetermined intervals in the radial direction. Next, a connecting portion between the main reinforcing bone 12 and the first annular reinforcing bone 14 that do not extend to the center of the inner tank bottom plate 11, for example, 20 places are set as the first suspension points 20.
The connecting portion between the main reinforcing bone 12 and the second annular reinforcing bone 15, for example, 30 places, is the second suspension point 40, and the connecting portion between the main reinforcing bone 12, the auxiliary reinforcing bone 13, and the third annular reinforcing bone 16, for example, 60 places. At the third suspension point 45, a connection portion between the main reinforcing bone 12 and the auxiliary reinforcing bone 13 and the fourth annular reinforcing bone 17, for example, 60 places is set as the fourth suspension point 50, and the sheaves 22, 42, 47 are provided at each suspension point. (See FIGS. 3 to 5). In addition, the said reinforcement bone 12-
Reference numeral 17 denotes a temporary reinforcing bone to be removed after the lowering of the inner tank bottom plate 11 is completed. Instead of the reinforcing bones 12 to 17, a reinforcing bone permanently attached to the inner tank bottom plate 11 may be used.
【００１７】ここで、図３に示すように、第１吊点２０
付近においては、補強材１２ａにセンターホールジャッ
キ２６が取付け金具２８で固定され、補強材１２ｂに支
持ブラケット３０が固定される。鉄筋用棒材（ＰＣ鋼
棒）からなる所定の径のネジ棒部材２５は、センターホ
ールジャッキ２６と支持ブラケット３０に挿通状に装着
され、内槽屋根６の頂部のブラケット９ａに上端部を連
結して２つの第１吊点２０へ延した２本のワイヤ２１は
シーブ２２，２３で案内され、それらの下端部が連結部
材２５ａを介してネジ棒部材２５に連結される。Here, as shown in FIG.
In the vicinity, a center hole jack 26 is fixed to the reinforcing member 12a by a mounting bracket 28, and a support bracket 30 is fixed to the reinforcing member 12b. A screw rod member 25 of a predetermined diameter made of a bar material (PC steel bar) for a reinforcing bar is inserted through the center hole jack 26 and the support bracket 30, and the upper end is connected to the bracket 9a at the top of the inner tank roof 6. The two wires 21 extending to the two first hanging points 20 are guided by sheaves 22 and 23, and their lower ends are connected to the threaded rod member 25 via the connecting member 25a.
【００１８】第２吊点４０付近においては、図４に示す
ように、第２吊点４０より中心側の主補強骨１２にセン
ターホールジャッキ２６と支持ブラケット３０が固定さ
れるとともに、センターホールジャッキ２６と支持ブラ
ケット３０にネジ棒部材２５が挿通状に装着され、内槽
側板９の頂部の頂部のブラケット９ａに上端部を連結し
て下方へ延したワイヤ４１はシーブ４２で案内され、そ
の下端部が連結部材２５ａを介してネジ棒部材２５に連
結される。In the vicinity of the second suspension point 40, as shown in FIG. 4, the center hole jack 26 and the support bracket 30 are fixed to the main reinforcing bone 12 on the center side of the second suspension point 40, and the center hole jack is provided. A screw rod member 25 is inserted into the support bracket 26 and the support bracket 30 in a penetrating manner. A wire 41 whose upper end is connected to a top bracket 9 a of the top of the inner tank side plate 9 and extends downward is guided by a sheave 42, and its lower end is guided. The part is connected to the screw rod member 25 via the connecting member 25a.
【００１９】図５に示すように、第３吊点４５付近にお
いては、補強材１２ｃにセンターホールジャッキ２６が
固定されるとともに、補強材１２ｄに支持ブラケット３
０が固定される。ネジ棒部材２５は、センターホールジ
ャッキ２６と支持ブラケット３０に挿通状に装着され、
内槽側板９の頂部のブラケット９ａに上端部を連結して
２つの第３吊点４５へ延した２本のワイヤ４６がシーブ
４７，４８で夫々案内され、それらの下端部が連結部材
２５ａを介してネジ棒部材２５に連結される。また、第
４吊点５０付近においても、図５に鎖線と実線で示すよ
うに、補強材１２ｃ，１２ｄに、センターホールジャッ
キ２６と支持ブラケット３０が夫々装着され、内槽側板
９の頂部のブラケット９ａに上端部を連結して２つの第
４吊点５０に延した２本のワイヤ５１は、シーブ４７，
４８を介して案内され、それらの下端部が、センターホ
ールジャッキ２６と支持ブラケット３０に挿通状に装着
されたネジ棒部材２５に連結部材２５ａを介して連結さ
れる。As shown in FIG. 5, near the third hanging point 45, the center hole jack 26 is fixed to the reinforcing member 12c, and the support bracket 3 is fixed to the reinforcing member 12d.
0 is fixed. The screw rod member 25 is inserted and mounted on the center hole jack 26 and the support bracket 30,
Two wires 46 whose upper ends are connected to the bracket 9a at the top of the inner tank side plate 9 and extend to the two third suspension points 45 are guided by sheaves 47 and 48, respectively, and their lower ends connect the connecting member 25a. Is connected to the threaded rod member 25 through the screw rod member. Also in the vicinity of the fourth suspension point 50, as shown by the chain line and the solid line in FIG. 5, the center hole jack 26 and the support bracket 30 are respectively mounted on the reinforcing members 12c and 12d, and the bracket on the top of the inner tank side plate 9 is provided. The two wires 51 connected to the upper ends of the wires 9a and extended to the two fourth suspension points 50 are connected to the sheave 47,
The lower ends thereof are connected to the center rod jack 26 and the screw bar member 25 inserted through the support bracket 30 through a connecting member 25a.
【００２０】図６を参照して、各第２吊点４０付近に設
ける１組の下降手段について説明する。１組の下降手段
は、ネジ棒部材２５と、センターホールジャッキ２６
と、支持ブラケット３０と、第１，第２ナット３１，３
２等からなる。取付け金具２８で固定されたセンターホ
ールジャッキ２６に対して、支持ブラケット３０はセン
ターホールジャッキ２６のラム２７の進出側に所定距離
離隔させて固定され、ネジ棒部材２５は、センターホー
ルジャッキ２６のセンターホール２６ａと支持ブラケッ
ト３０の挿通穴３０ａとに挿通して装着されている。ネ
ジ棒部材２５のうちのセンターホールジャッキ２６と支
持ブラケット３０との間の部分には第１ナットが螺合さ
れ、ネジ棒部材２５のうちの支持ブラケット３０に対し
てセンターホールジャッキ２６と反対側の部分に第２ナ
ットが螺合される。尚、第１，第３，第４吊点２０，４
５，５０の各々の付近にも、前記同様の１組の下降手段
が同様に配設され、全てのセンターホールジャッキ２６
は共通の油圧供給源に接続される。Referring to FIG. 6, a set of lowering means provided near each second suspension point 40 will be described. One set of lowering means includes a screw rod member 25 and a center hole jack 26.
, Support bracket 30, first and second nuts 31, 3
Consists of 2 etc. The support bracket 30 is fixed to the center hole jack 26 fixed by the mounting bracket 28 at a predetermined distance from the center hole jack 26 on the side where the ram 27 advances, and the screw rod member 25 is fixed to the center of the center hole jack 26. It is inserted through the hole 26a and the insertion hole 30a of the support bracket 30 and is mounted. A first nut is screwed into a portion of the screw rod member 25 between the center hole jack 26 and the support bracket 30, and is opposite to the center hole jack 26 with respect to the support bracket 30 of the screw rod member 25. The second nut is screwed into the portion. The first, third, and fourth suspension points 20, 4
In the vicinity of each of the center hole jacks 26 and 25, a similar set of lowering means is provided.
Are connected to a common hydraulic supply.
【００２１】次に、内槽底板下降方法の具体的内容につ
いて、図６〜図１０に基いて説明する。各ネジ棒部材２
５において、図６に示すように、第１ナット３１をラム
２７の先端に係止させ、第２ナット３２を支持ブラケッ
ト３０に係止させている状態から、図７に示すように、
先ず、第１ナット３１をラム２７の最大進出ストローク
に相当する距離よりも１〜２cm短い距離だけ支持ブラケ
ット３０側に移動させ、センターホールジャッキ２６を
駆動してラム２７を進出させる。このとき、ラム２７を
進出させると、ネジ棒部材２５は１〜２cmだけ移動す
る。Next, the specific contents of the method of lowering the inner tank bottom plate will be described with reference to FIGS. Each screw rod member 2
5, from the state where the first nut 31 is locked to the tip of the ram 27 and the second nut 32 is locked to the support bracket 30 as shown in FIG.
First, the first nut 31 is moved toward the support bracket 30 by a distance shorter by 1 to 2 cm than the distance corresponding to the maximum advance stroke of the ram 27, and the center hole jack 26 is driven to advance the ram 27. At this time, when the ram 27 is advanced, the screw bar member 25 moves by 1 to 2 cm.
【００２２】図８に示すように、ラム２７が進出してラ
ム２７の先端が第１ナット３１に当接した後、ネジ棒部
材２５が１〜２cmだけ移動するので、支持ブラケット３
０と第２ナット３２との間には１〜２cm程度の隙間が生
じる。これは第２ナット３２に作用していた底板重量が
第１ナット３１に移行したことを容易に確認できること
と、第２ナット３２の移動をスパナ等の工具を使用する
ことなく手で行えることを保障するものである。図９に
示すように、第１ナット３１をラム２７の先端に係止さ
せた状態で、第２ナット３２を支持ブラケット３０と反
対側へ設定移動量Ｌだけ移動させる。ここで、第２ナッ
ト３２の移動量Ｌは第１〜第４吊点２０，４０，４５，
５０で夫々異なり、内槽底板１１を水平状態に保持して
下降させる為に、ネジ棒部材２５に連結されたワイヤの
内槽底板１１に対する仰角に応じて設定される。尚、第
１、第４吊点２０，５０のワイヤ２１、５１の仰角は略
同じであるので、第２ナット３２の移動量Ｌも同じ量に
設定される（図１参照）。As shown in FIG. 8, after the ram 27 advances and the tip of the ram 27 contacts the first nut 31, the screw bar member 25 moves by 1 to 2 cm.
A gap of about 1 to 2 cm is generated between 0 and the second nut 32. This means that it is easy to confirm that the weight of the bottom plate acting on the second nut 32 has shifted to the first nut 31, and that the second nut 32 can be moved by hand without using a tool such as a spanner. It guarantees. As shown in FIG. 9, the second nut 32 is moved to the opposite side of the support bracket 30 by the set movement amount L while the first nut 31 is locked on the tip of the ram 27. Here, the moving amount L of the second nut 32 is the first to fourth suspension points 20, 40, 45,
The reference numeral 50 is different from each other, and is set according to the elevation angle of the wire connected to the screw rod member 25 with respect to the inner tank bottom plate 11 in order to hold and lower the inner tank bottom plate 11 in a horizontal state. Since the elevation angles of the wires 21 and 51 of the first and fourth suspension points 20 and 50 are substantially the same, the movement amount L of the second nut 32 is also set to the same amount (see FIG. 1).
【００２３】次に、全部のセンターホールジャッキ２６
の油圧を所定の速度で徐々に開放すると、図１０に示す
ように、第１ナット３１をラム２７の先端に係止させた
状態でラム２７が退入し、第２ナット３２が支持ブラケ
ット３０に係止するまで、ネジ棒部材２５が移動してワ
イヤが移動量Ｌだけ送出される。つまり、全部のセンタ
ーホールジャッキ２６を駆動してラム２７を進出させた
後、各ネジ棒部材２５において、それに連結されたワイ
ヤの仰角に応じて設定される移動量Ｌだけ第２ナット３
２を移動させた後、全部のセンターホールジャッキ２６
の油圧を徐々に開放すると、内槽底板１１が水平状態を
保持して１下降サイクル分の所定ストローク下降させる
ことができる。尚、移動量Ｌはラム２７の最大進出スト
ロークよりも短いので、ラム２７が完全に退入すると、
ラム２７と第１ナット３１との間には隙間が生じる。こ
れは第１ナット３１に作用していた底板荷重が第２ナッ
ト３２に移行したことを容易に確認できることと、第１
ナット３１の移動をスパナ等の工具を使用することなく
行えることを保障するものである。Next, all the center hole jacks 26
When the hydraulic pressure is gradually released at a predetermined speed, as shown in FIG. 10, the ram 27 is retracted while the first nut 31 is locked at the tip of the ram 27, and the second nut 32 is The screw rod member 25 moves and the wire is sent out by the movement amount L until it is locked. That is, after driving all the center hole jacks 26 to advance the ram 27, the second nut 3 is moved by the amount of movement L set in each screw bar member 25 according to the elevation angle of the wire connected thereto.
After moving 2, all center hole jacks 26
When the hydraulic pressure is gradually released, the inner tank bottom plate 11 can be lowered by a predetermined stroke for one descent cycle while maintaining the horizontal state. Since the moving amount L is shorter than the maximum advance stroke of the ram 27, when the ram 27 completely retreats,
A gap is formed between the ram 27 and the first nut 31. This means that it can be easily confirmed that the bottom plate load acting on the first nut 31 has shifted to the second nut 32,
This guarantees that the nut 31 can be moved without using a tool such as a spanner.
【００２４】以後、前記同様に、各ネジ棒部材２５にお
いて、第１ナット３１をラム２７の先端に係止させて第
２ナット３２が支持ブラケット３０に当接するまでラム
２７を退入させる状態と、第２ナット３２を支持ブラケ
ット３０に係止させ第１ナット３１をラム２７の最大進
出位置よりも１〜２cm短い位置まで移動させてからラム
２７を最大ストローク進出させ且つラム２７の進出後に
第２ナット３２の位置を切換える状態とに交互に複数回
切換えて、複数の下降サイクルを経て内槽底板１１を底
部保冷材８の上面まで下降させる。Thereafter, in the same manner as described above, in each screw bar member 25, the first nut 31 is locked to the tip of the ram 27, and the ram 27 is retracted until the second nut 32 contacts the support bracket 30. After the second nut 32 is locked to the support bracket 30 and the first nut 31 is moved to a position shorter by 1 to 2 cm than the maximum advance position of the ram 27, the ram 27 is advanced to the maximum stroke, and the ram 27 is advanced after the advance of the ram 27. The position of the two nuts 32 is alternately switched a plurality of times to lower the inner tank bottom plate 11 to the upper surface of the bottom cold insulator 8 through a plurality of lowering cycles.
【００２５】以上のように、低温タンクの内槽底板下降
方法によれば、第１〜第４吊点２０，４０，４５，５０
において、各下降サイクルの各ワイヤの送出し量を、ワ
イヤの仰角に応じて夫々設定し、内槽底板１１を水平状
態に保持して確実に下降させることができる。また、ネ
ジ棒部材２５に第１，第２ナット３１，３２を螺合さ
せ、支持ブラケット３０を設けることで、ネジ棒部材２
５に連結されたワイヤの送出し量をワイヤの仰角に応じ
て第２ナット３２と支持ブラケット３０を介して設定で
きるので、簡単な構造で安価なセンターホールジャッキ
２６を適用可能になり、内槽底板１１を下降させる設備
コストを格段に低減することができる。As described above, according to the method for lowering the inner tank bottom plate of the low-temperature tank, the first to fourth suspension points 20, 40, 45, 50
In the above, the delivery amount of each wire in each descending cycle is set according to the elevation angle of the wire, and the inner tank bottom plate 11 can be held down in a horizontal state without fail. Further, by screwing the first and second nuts 31 and 32 to the screw rod member 25 and providing the support bracket 30, the screw rod member 2 is provided.
5 can be set via the second nut 32 and the support bracket 30 in accordance with the elevation angle of the wire, so that the inexpensive center hole jack 26 with a simple structure can be applied. Equipment costs for lowering the bottom plate 11 can be significantly reduced.
【００２６】しかも、このセンターホールジャッキ２６
は、１対のコレットでワイヤを交互に噛み込んで尺取り
虫的にロッドを送出するようにしたダブルシリンダ式セ
ンターホールジャッキに比べると、簡単な構造でコレッ
トも無いためコレットがロック状態になって故障するこ
ともなく、その種の故障で作業が中断することもない。
また、鉄筋コンクリートに用いられる鉄筋用棒材（ＰＣ
鋼棒）からなるネジ棒部材２５と、このネジ棒部材２５
に螺合する第１，第２ナット３１，３２を適用したの
で、設備コストが高価になることもない。Moreover, the center hole jack 26
Compared to a double-cylinder center hole jack in which a pair of collets bite a wire alternately and send a rod like a worm, the collet is locked because it has a simple structure and no collet, so it breaks down Work is not interrupted by such a failure.
In addition, rods for reinforcing steel (PC
A screw rod member 25 made of a steel rod);
Since the first and second nuts 31 and 32 to be screwed into are used, the equipment cost does not increase.
【００２７】次に、前記実施形態を部分的に変更した変
更態様について説明する。 １〕例えば、架台１０を撤去する際等、内槽底板１１を
上昇させたい場合には、第１ナット３１をラム２７の先
端に係止させ、ラム２７を進出駆動させるとよい。更
に、内槽底板１１を水平状態を保持して上昇させたい場
合には、ネジ棒部材２５のうち第１ナット３１と支持ブ
ラケット３０の間に第３のナット部材を螺合させ、この
ナット部材を支持ブラケット３０に係止させてネジ棒部
材２５の移動ストロークを調節すればよい。 ２〕前記ネジ棒部材２５と第１，第２ナット３１，３２
の代わりに、ロッドにネジ溝を形成した一般的なネジ棒
部材と、そのネジ棒部材に螺合する通常のナットを適用
してもよい。Next, a description will be given of a modification in which the above embodiment is partially modified. 1] For example, when removing the gantry 10 and wanting to raise the inner tank bottom plate 11, the first nut 31 may be engaged with the tip of the ram 27 and the ram 27 may be driven forward. Further, when it is desired to raise the inner tank bottom plate 11 while maintaining the horizontal state, a third nut member is screwed between the first nut 31 and the support bracket 30 of the screw rod member 25, and this nut member May be locked to the support bracket 30 to adjust the movement stroke of the screw rod member 25. 2] The screw rod member 25 and the first and second nuts 31 and 32
Instead of this, a general threaded rod member having a thread groove formed in the rod and a normal nut screwed into the threaded rod member may be applied.
【００２８】[0028]
【発明の効果】請求項１の低温タンクの内槽底板下降方
法によれば、各ネジ棒部材のうちのセンターホールジャ
ッキと支持ブラケットとの間に部分に螺合させた第１ナ
ットを、ラムの先端に係止させてラムを退入させる状態
と、ネジ棒部材のうちの支持ブラケットに対してセンタ
ーホールジャッキと反対側の部分に螺合させた第２ナッ
トを、支持ブラケットに係止させてラムを進出させる状
態とに交互に切換えながら、第１，第２ナットの位置を
順々に切換えて内槽底板を下降させるので、第１ナット
を進出移動したラムの先端に係止させた状態で、第２ナ
ットを支持部材に対して離隔させる距離で以て各ワイヤ
の１サイクルの送出し量を自由に設定できるから、各ワ
イヤの内槽底板に対する仰角に応じて送出し量を設定
し、夫々、ワイヤとネジ棒部材とセンターホールジャッ
キと第１ナットと支持ブラケットと第２ナットとからな
る複数組の下降手段を同時作動させつつ、内槽底板を水
平状態に保持して確実に下降させることができる。According to the method of lowering the inner tank bottom plate of the low-temperature tank according to the first aspect, the first nut screwed into the portion between the center hole jack and the support bracket of each screw rod member is provided. A state in which the ram is retracted by being locked to the tip of the support bracket, and a second nut screwed to a portion of the threaded bar member opposite to the center hole jack with respect to the support bracket is locked to the support bracket. While alternately switching to the state in which the ram is advanced, the positions of the first and second nuts are sequentially switched to lower the inner tank bottom plate, so that the first nut is locked to the tip of the advanced ram. In this state, the amount of each wire to be sent out in one cycle can be freely set by the distance separating the second nut from the support member. Therefore, the amount of each wire to be sent is set according to the elevation angle of the wire with respect to the inner tank bottom plate. And each with a wire While simultaneously operating a plurality of sets of lowering means consisting of a di-rod member and the center hole jack and the first nut and the support bracket and the second nut can be reliably lowered to hold the inner tank bottom plate in the horizontal state.
【００２９】各下降手段において、ネジ棒部材と、セン
ターホールジャッキと、ネジ棒部材に螺合した第１ナッ
トと、支持ブラケットと、ネジ棒部材に螺合した第２ナ
ットを用いるので、センターホールジャッキとしては、
１シリンダ式の簡単な構造のセンターホールジャッキを
適用することができるから、内槽底板を下降させる為の
設備の設備コストを、ダブルシリンダ式センターホール
ジャッキを用いる場合に比べて著しく低減することがで
きる。In each of the descending means, a screw rod member, a center hole jack, a first nut screwed to the screw rod member, a support bracket, and a second nut screwed to the screw rod member are used. As a jack,
Since the center hole jack having a simple structure of one cylinder type can be applied, the equipment cost for lowering the inner tank bottom plate can be significantly reduced as compared with the case of using a double cylinder center hole jack. it can.
【００３０】前記１シリンダ式の簡単な構造のセンター
ホールジャッキには、コレットが設けられておらず、コ
レットのロック状態が発生することもないので、前記ロ
ック状態に起因する作業中断もなく、円滑に能率的に下
降作業を行うことができる。The one-cylinder type center hole jack having a simple structure is not provided with a collet, so that the locked state of the collet does not occur. The descent work can be performed efficiently.
【００３１】請求項２の低温タンクの内槽底板下降方法
によれば、ネジ棒部材として、鉄筋コンクリートに用い
られる鉄筋用棒材（ＰＣ鋼棒）を適用し、第１，第２ナ
ットとして鉄筋用棒材（ＰＣ鋼棒）に螺合するナット部
材を適用するので、内槽底板を下降させる為の設備コス
トを一層低減できる。According to the method for lowering the inner tank bottom plate of the low-temperature tank according to the present invention, a rod material (PC steel rod) used for reinforced concrete is applied as a screw rod member, and first and second nuts for reinforcing steel are used. Since the nut member screwed to the bar (PC steel bar) is applied, the equipment cost for lowering the inner tank bottom plate can be further reduced.
【図１】本発明の実施形態に係る低温タンクの縦断面図
である。FIG. 1 is a longitudinal sectional view of a low-temperature tank according to an embodiment of the present invention.
【図２】内槽底板の平面図である。FIG. 2 is a plan view of an inner tank bottom plate.
【図３】第１吊点付近を示す要部斜視図である。FIG. 3 is a perspective view of a main part showing a vicinity of a first hanging point.
【図４】第２吊点付近を示す要部斜視図である。FIG. 4 is a perspective view of a main part showing the vicinity of a second hanging point.
【図５】第３，第４点付近を示す要部斜視図である。FIG. 5 is a perspective view of relevant parts showing the vicinity of third and fourth points.
【図６】図４に示す１組の下降手段の拡大側面図であ
る。FIG. 6 is an enlarged side view of a pair of lowering means shown in FIG. 4;
【図７】図６に示す１組の下降手段の動作説明図（第１
ナット移動状態）である。FIG. 7 is an explanatory diagram of the operation of the pair of descending means shown in FIG.
Nut moving state).
【図８】図６に示す１組の下降手段の動作説明図（ラム
進出状態）である。FIG. 8 is an operation explanatory view (ram advance state) of one set of descending means shown in FIG. 6;
【図９】図６に示す１組の下降手段の動作説明図（第２
ナット移動状態）である。FIG. 9 is a view for explaining the operation of the pair of lowering means shown in FIG.
Nut moving state).
【図１０】図６に示す１組の下降手段の動作説明図（ネ
ジ棒棒部材移動状態）である。FIG. 10 is an explanatory diagram of the operation of the pair of descending means shown in FIG. 6 (in a state where a threaded bar member is moved).
１ 低温タンク ８ 底部保冷材 １０ 架台 １１ 内槽底板 ２１，４１，４６，５１ ワイヤ １２ 主補強骨 １３ 副補強骨 １４，１５，１６，１７ 第１〜第４環状補強骨 ２５ ネジ棒部材 ２６ センターホールジャッキ ２６ａ センターホール ２７ ラム ３０ 支持ブラケット ３０ａ 挿通穴 ３１ 第１ナット ３２ 第２ナット DESCRIPTION OF SYMBOLS 1 Low-temperature tank 8 Bottom cold insulator 10 Mount 11 Inner tank bottom plate 21, 41, 46, 51 Wire 12 Main reinforcing bone 13 Secondary reinforcing bone 14, 15, 16, 17 First to fourth annular reinforcing bone 25 Screw rod member 26 Center Hole jack 26a Center hole 27 Ram 30 Support bracket 30a Insertion hole 31 First nut 32 Second nut
───────────────────────────────────────────────────── フロントページの続き (72)発明者 小椋 保昭 兵庫県加古郡播磨町新島８番地 川崎重 工業株式会社播磨工場内 (72)発明者 菅 真司 兵庫県加古郡播磨町新島８番地 川崎重 工業株式会社播磨工場内 川重工事株式 会社 西部支社 (72)発明者 岩上 次郎 兵庫県加古郡播磨町新島８番地 川崎重 工業株式会社播磨工場内 川重工事株式 会社 西部支社 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Yasuaki Ogura 8 Harima-cho, Harima-cho, Kako-gun, Hyogo Kawasaki Heavy Industries, Ltd. (72) Inventor Shinji Suga 8 Shinima, Harima-cho, Hakogo Kawaju Construction Co., Ltd.West Branch of Harima Plant Co., Ltd.
Claims (2)
台上で内槽底板の溶接及び非破壊検査を実施してから、
内槽底板よりも上方のタンク構造部材に一端を連結した
複数のワイヤを介して内槽底板を支持した状態において
架台を撤去し、前記複数のワイヤを介して内槽底板を底
部保冷材の上面まで下降させる内槽底板下降方法におい
て、 前記内槽底板の上面に補強材を取付けて固定するととも
に、各ワイヤの他端部に連結されたネジ棒部材を、補強
材に固定されたセンターホールジャッキのセンターホー
ルと、センターホールジャッキに対してセンターホール
ジャッキのラムの進出側に所定距離離隔させて補強材に
固定された支持ブラケットの挿通穴とに挿通させ、 前記各ネジ棒部材のうちのセンターホールジャッキと支
持ブラケットとの間の部分に螺合させた第１ナットを、
ラムの先端に係止させてラムを退入させる状態と、ネジ
棒部材のうちの支持ブラケットに対してセンターホール
ジャッキと反対側の部分に螺合させた第２ナットを、支
持ブラケットに係止させてラムを進出させる状態とに交
互に切換えながら、第１，第２ナットの位置を順々に切
換えて内槽底板を下降させることを特徴とする低温タン
クの内槽底板下降方法。1. After performing welding and non-destructive inspection of the inner tank bottom plate on a gantry temporarily installed on the cold insulator at the bottom of the low temperature tank,
The gantry is removed in a state where the inner tank bottom plate is supported via a plurality of wires having one ends connected to the tank structural member above the inner tank bottom plate, and the inner tank bottom plate is connected to the upper surface of the bottom cold insulator through the plurality of wires. In the method of lowering the inner tank bottom plate, a reinforcing member is attached and fixed to the upper surface of the inner tank bottom plate, and a screw rod member connected to the other end of each wire is fixed to the center hole jack fixed to the reinforcing member. The center hole of the screw rod member is inserted through the center hole of the screw rod member at a predetermined distance away from the center hole jack on the side where the ram of the center hole jack is advanced. The first nut screwed into the part between the hole jack and the support bracket,
A state in which the ram is retracted by being locked to the tip of the ram, and a second nut screwed into a portion of the screw rod member opposite to the center hole jack with respect to the support bracket is locked to the support bracket. A method for lowering the inner tank bottom plate of a cryogenic tank, wherein the position of the first and second nuts is sequentially switched to lower the inner tank bottom plate while alternately switching to a state in which the ram advances.
トに用いられる鉄筋用棒材（ＰＣ鋼棒）を適用し、第
１，第２ナットとして鉄筋用棒材（ＰＣ鋼棒）に螺合す
るナット部材を適用することを特徴とする請求項１に記
載の低温タンクの内槽底板下降方法。2. A nut member used for a reinforced concrete (PC steel bar) used for reinforced concrete as the screw bar member, and a nut member screwed to the reinforcing bar (PC steel bar) as first and second nuts. The method for lowering the inner tank bottom plate of the low-temperature tank according to claim 1, wherein:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34810695A JP2750519B2 (en) | 1995-12-14 | 1995-12-14 | How to lower the bottom plate of the low temperature tank |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34810695A JP2750519B2 (en) | 1995-12-14 | 1995-12-14 | How to lower the bottom plate of the low temperature tank |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09165935A JPH09165935A (en) | 1997-06-24 |
| JP2750519B2 true JP2750519B2 (en) | 1998-05-13 |
Family
ID=18394784
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP34810695A Expired - Fee Related JP2750519B2 (en) | 1995-12-14 | 1995-12-14 | How to lower the bottom plate of the low temperature tank |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2750519B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3836359B2 (en) | 2001-12-03 | 2006-10-25 | 東京応化工業株式会社 | Positive resist composition and resist pattern forming method |
-
1995
- 1995-12-14 JP JP34810695A patent/JP2750519B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH09165935A (en) | 1997-06-24 |
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