JP2016053277A - Construction method of storage tank and storage tank - Google Patents

Construction method of storage tank and storage tank Download PDF

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JP2016053277A
JP2016053277A JP2014180046A JP2014180046A JP2016053277A JP 2016053277 A JP2016053277 A JP 2016053277A JP 2014180046 A JP2014180046 A JP 2014180046A JP 2014180046 A JP2014180046 A JP 2014180046A JP 2016053277 A JP2016053277 A JP 2016053277A
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steel plate
side wall
wall steel
storage tank
construction method
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JP6371169B2 (en
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松浦 正典
Masanori Matsuura
正典 松浦
安永 正道
Masamichi Yasunaga
正道 安永
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Kajima Corp
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Abstract

PROBLEM TO BE SOLVED: To provide a construction method of a storage tank of high efficiency.SOLUTION: A sidewall steel plate 31 for forming a sidewall of an inner tank 3a of an LNG tank 100 is temporarily arranged by superposing a plurality of layers in the inner-outer direction on the inside of an oil protective barrier 2. A steel roof 32 is installed on the innermost side annular sidewall steel plate 31. Afterwards, this steel roof 32 and the sidewall steel plate 31 are lifted, and a residual sidewall steel plate 31 of a planar C shape is pushed in toward the inside from the outside, and an upper edge position of the sidewall steel plate 31 of becoming newly the innermost side among the residual sidewall steel plate 31, is joined to the lower edge of the lifted sidewall steel plate 31, and is closed by welding mutual side ends of the sidewall steel plate 31, and the upper edge of this sidewall steel plate 31 and the lower edge of the lifted sidewall steel plate 31 are welded. An inner tank 3a is constructed by repeating this.SELECTED DRAWING: Figure 1

Description

本発明は、貯留槽の構築方法、および貯留槽に関する。   The present invention relates to a storage tank construction method and a storage tank.

LNG(液化天然ガス)、LPG(液化石油ガス)などの液体を貯留する設備として、PC(プレストレストコンクリート)タンクがある。図11は、PCタンクとして、LNGを貯留するLNGタンク100の例を示したものである。図11のLNGタンク100は、地盤7中の杭4で支持された底版5上に防液堤2を設け、その内側に鋼板等による内槽3aと外槽3bを設置したものである。外槽3bの屋根部は鋼製または鉄筋コンクリート製であり、側部はライナープレート(薄鉄板)を防液堤2に貼り付けた形となっている。   A PC (prestressed concrete) tank is a facility for storing liquids such as LNG (liquefied natural gas) and LPG (liquefied petroleum gas). FIG. 11 shows an example of an LNG tank 100 that stores LNG as a PC tank. The LNG tank 100 of FIG. 11 is provided with a liquid breakwater 2 on a bottom slab 5 supported by a pile 4 in the ground 7 and an inner tank 3a and an outer tank 3b made of steel plates or the like inside. The roof portion of the outer tub 3b is made of steel or reinforced concrete, and the side portion has a shape in which a liner plate (thin iron plate) is attached to the liquid barrier 2.

LNGは内槽3aにて貯留し、内槽3aと外槽3bの間に断熱材を配置し保冷を行う。内槽3aの側壁鋼板は、貯留量が20万KLクラスの場合、40-50mm厚さの低温鋼材、例えば9%ニッケル鋼等が使用されるのが一般的である。   LNG is stored in the inner tank 3a, and a heat insulating material is disposed between the inner tank 3a and the outer tank 3b to perform cold insulation. When the storage amount is 200,000 KL class, a low temperature steel material having a thickness of 40-50 mm, such as 9% nickel steel, is generally used for the side wall steel plate of the inner tank 3a.

防液堤2は、内槽3a等が破損した場合にLNGの外部への液漏れを防ぐために設けられるコンクリート製の壁体であり、通常円筒形である。防液堤2はLNGの液圧に耐え得る構造とする必要があり、そのため鉛直方向および周方向の緊張材(不図示)によりプレストレスが導入される。   The breakwater 2 is a concrete wall provided to prevent leakage of LNG to the outside when the inner tank 3a or the like is damaged, and is generally cylindrical. The breakwater 2 needs to have a structure capable of withstanding the hydraulic pressure of LNG, and therefore prestress is introduced by vertical and circumferential tension members (not shown).

このようなPCタンクの施工時は、全体工期を短縮するため、内槽3aを防液堤2等と並行して施工するのが一般的である。そのため、防液堤2は、内槽3a用の資材(側壁用の鋼板など)を搬入するための開口部を設けた状態で構築される。そして、この開口部から、内槽3aの施工の進捗に合わせて順次資材を搬入し、内槽3aを組み立ててゆく(例えば特許文献1参照)。   When constructing such a PC tank, it is common to construct the inner tub 3a in parallel with the breakwater 2 etc. in order to shorten the overall construction period. Therefore, the liquid breakwater 2 is constructed in a state in which an opening for carrying in materials for the inner tub 3a (such as a steel plate for a side wall) is provided. And material is sequentially carried in from this opening part according to the progress of construction of inner tub 3a, and inner tub 3a is assembled (for example, refer to patent documents 1).

またそれとは別に、防液堤2には作業員通路や小型資機材搬入用の比較的小さな開口部も設けられる。開口部の大きさや数は内槽3aの工事方法によって異なるが、内槽3a用の資材搬入のための開口部としては、例えば高さ15m、幅10m程度の開口部が2箇所程設けられ、作業員通路や小型資機材搬入用の開口部としては、例えば高さ2.5m、幅2m程度の開口部が2箇所程設けられる。   Separately, the breakwater 2 is also provided with a worker passage and a relatively small opening for carrying small materials and equipment. The size and number of openings vary depending on the construction method of the inner tub 3a, but as openings for carrying in materials for the inner tub 3a, for example, two openings having a height of about 15 m and a width of about 10 m are provided. For example, two openings having a height of about 2.5 m and a width of about 2 m are provided as opening portions for worker passages and small materials and equipment.

特開平7−62925号公報Japanese Patent Laid-Open No. 7-62925

現在、より効率よく内槽3a等を構築し、開口部の閉塞作業を最小とすることで、工期を短縮できる手法が求められている。   Currently, there is a demand for a technique that can shorten the work period by constructing the inner tank 3a and the like more efficiently and minimizing the closing operation of the opening.

例えば図11のようなPCタンクでは、通常、防液堤2の開口部をプレストレスの導入前に閉塞しておく必要がある。工期に十分な余裕がある場合には、内槽3aの構築後、開口部を閉塞して防液堤2にプレストレスを導入すれば問題ない。しかし、短期間でのPCタンクの完成を求められる場合には、内槽3aの構築をより効率よく行い、防液堤2へのプレストレス導入も早期に行いたい要望がある。しかしながら、前記した方法は効率性の点で改善の余地があり、防液堤2に関しても、クリテイカルとなる開口部の閉塞作業、特に内槽3a用の資材搬入のための大きな開口部の閉塞作業に時間を要する。   For example, in the PC tank as shown in FIG. 11, it is usually necessary to close the opening of the breakwater 2 before introducing prestress. If the construction period has a sufficient margin, there is no problem if the prestress is introduced into the breakwater 2 by closing the opening after the construction of the inner tank 3a. However, when it is required to complete the PC tank in a short period of time, there is a desire to construct the inner tank 3a more efficiently and to introduce prestress into the liquid barrier 2 early. However, the above-described method has room for improvement in terms of efficiency, and also the work for closing the critical opening, particularly the work for closing the large opening for carrying in the material for the inner tank 3a, with respect to the breakwater 2. Takes time.

本発明は、効率性の高い貯留槽の構築方法等を提供することを目的とする。   An object of this invention is to provide the construction method etc. of a highly efficient storage tank.

前述した課題を解決するための第1の発明は、貯留槽の構築方法であって、前記貯留槽の側壁を形成するための前記貯留槽の側壁鋼板を、内外方向に複数重ねて仮置きする工程(a)と、最内側の環状の側壁鋼板を上昇させ、平面C字状の残りの側壁鋼板を外側から内側へ向かって押し込み、上昇させた側壁鋼板の下縁と、残りの側壁鋼板のうち新たに最内側となった側壁鋼板の上縁の位置を合わせ、前記新たに最内側となった側壁鋼板の側端同士、および、当該側壁鋼板の上縁と前記上昇させた側壁鋼板の下縁を接合する工程(b)と、を有することを特徴とする貯留槽の構築方法である。   1st invention for solving the subject mentioned above is the construction method of a storage tank, Comprising: The side wall steel plate of the said storage tank for forming the side wall of the said storage tank is temporarily piled up in multiple numbers in the inside and outside direction. Step (a), the innermost annular side wall steel plate is raised, the remaining flat C-shaped side wall steel plate is pushed in from the outside to the inside, the lower edge of the raised side wall steel plate, and the remaining side wall steel plate Align the position of the upper edge of the side wall steel plate that is newly the innermost side, the side edges of the side wall steel plate that is the innermost side, and the upper edge of the side wall steel plate and the bottom side of the raised side wall steel plate And a step (b) for joining the edges.

前記工程(a)において、前記側壁鋼板は、複数の鋼板部材の鉛直方向の辺同士の外側を接合し周方向に連続させて形成されることが望ましい。また、前記貯留槽は、防液堤の内側に設けられるものであり、前記工程(a)では、構築途中の前記防液堤の上から前記防液堤の内側に搬送した複数の鋼板部材を接合することにより、前記防液堤の内側で前記側壁鋼板が形成されることが望ましい。   In the step (a), the side wall steel plate is preferably formed by joining the outer sides of the vertical sides of the plurality of steel plate members and continuously in the circumferential direction. The storage tank is provided inside the liquid breakwater, and in the step (a), a plurality of steel plate members conveyed from above the liquid breakage in the middle of the construction to the inside of the liquid breakwater are provided. It is desirable that the side wall steel plate is formed inside the liquid barrier by joining.

前記工程(b)では、前記上昇させた側壁鋼板の下縁と、前記残りの側壁鋼板のうち最内側の側壁鋼板の上縁とに取付けられた仮受ピースにより、位置合わせが行われることが望ましい。また、前記仮受ピースでは、孔または切欠きが形成されることが望ましい。   In the step (b), the alignment may be performed by a provisional piece attached to the lower edge of the raised side wall steel plate and the upper edge of the innermost side wall steel plate among the remaining side wall steel plates. desirable. Moreover, it is desirable that a hole or a notch is formed in the temporary receiving piece.

また、前記工程(a)において、前記側壁鋼板がストック架台で保持されることが望ましい。さらに、前記工程(b)で側壁鋼板を外側から内側へと押し込む際は、複数のジャッキを用いて、C字の開部分から遠い位置から順に、前記側壁鋼板を内側へ押圧することが望ましい。   In the step (a), it is desirable that the side wall steel plate is held by a stock frame. Further, when the side wall steel plate is pushed in from the outside to the inside in the step (b), it is desirable to press the side wall steel plate inward in order from a position far from the C-shaped open portion using a plurality of jacks.

第2の発明は、第1の発明の貯留槽の構築方法によって構築された貯留槽である。   2nd invention is the storage tank constructed | assembled by the construction method of the storage tank of 1st invention.

本発明では、貯留槽の側壁鋼板を内外に重ねて一旦仮置きし、その後、最内側の環状の側壁鋼板を上昇させ、残りの平面C字状の側壁鋼板を外側から押し込む。これにより、上昇させた側壁鋼板の下縁に、押し込んだ側壁鋼板の上縁の位置を合わせ、押し込んだ側壁鋼板の閉合と上下の側壁鋼板の接合を行い、以下これを繰り返す。これにより、一旦側壁鋼板を仮置きした後は、手間を掛けずに貯留槽の側壁を効率よく構築でき、追加の資材搬入もほぼ不要である。   In the present invention, the side wall steel plates of the storage tank are temporarily placed on top of each other and temporarily placed, and then the innermost annular side wall steel plates are raised, and the remaining flat C-shaped side wall steel plates are pushed in from the outside. Thereby, the position of the upper edge of the pushed side wall steel plate is aligned with the lower edge of the raised side wall steel plate, the pushed side wall steel plate is closed, and the upper and lower side wall steel plates are joined. Thereby, once the side wall steel plate is temporarily placed, the side wall of the storage tank can be efficiently constructed without taking time and almost no additional material is carried in.

また、側壁鋼板は鋼板部材を周方向に連続させて形成し、鋼板部材を防液堤の構築途中の早期に防液堤の上から防液堤内に搬入することで、資材搬入を短期間で済ませることができる。資材搬入後は貯留槽と防液堤の構築作業を並行することができる。また、防液堤に資材搬入用の大きな開口部が不要となるので、迅速にプレストレスを導入できる。結果、タンク施工時の全体工期を短縮できる。   In addition, the side wall steel plate is formed by continuously forming steel plate members in the circumferential direction, and the steel plate member is carried into the breakwater from above the breakwater early in the course of construction of the breakwater, so that material can be carried in a short period of time. I can finish it. After material delivery, the construction work of the storage tank and the breakwater can be done in parallel. Moreover, since the large opening part for material conveyance is unnecessary in a liquid barrier, prestress can be introduce | transduced rapidly. As a result, it is possible to shorten the overall construction period for tank construction.

さらに、上下の側壁鋼板には仮受ピースが取付けられるので、これを用いて位置合わせが容易にできる。仮受ピースに孔や切欠きを設けることで、上下の側壁鋼板の溶接を好適に行える。また、仮置きした側壁鋼板は、C字の開部から遠い位置から順にジャッキで押し込むことで、C字の側壁鋼板を内側へ押し込みつつ、その側端同士を好適に突き合わせることができる。   Furthermore, since a temporary receiving piece is attached to the upper and lower side wall steel plates, alignment can be easily performed using this. By providing a hole or a notch in the provisional piece, it is possible to suitably weld the upper and lower side wall steel plates. Further, the temporarily placed side wall steel plates can be suitably butted against each other while pushing the C side wall steel plates inwardly by pushing them in order from a position far from the C-shaped opening.

本発明により、効率性の高い貯留槽の構築方法等を提供することができる。   According to the present invention, it is possible to provide a highly efficient storage tank construction method and the like.

側壁鋼板31の配置を上から見た図The figure which looked at arrangement of side wall steel plate 31 from the top 側壁鋼板31の配置を示す図The figure which shows arrangement | positioning of the side wall steel plate 31 隣り合う鋼板部材310同士の溶接箇所33を示す水平方向の断面図Horizontal sectional view showing a welded portion 33 between adjacent steel plate members 310 内槽3aの構築方法を示す図The figure which shows the construction method of the inner tank 3a 内槽3aの構築方法を示す図The figure which shows the construction method of the inner tank 3a ジャッキ62による押圧について示す図The figure shown about the press by the jack 62 ジャッキ62による押圧について示す図The figure shown about the press by the jack 62 側壁鋼板31の位置合わせ等について示す図The figure shown about position alignment etc. of the side wall steel plate 31 内槽3aの構築方法を示す図The figure which shows the construction method of the inner tank 3a 内槽3aの構築方法を示す図The figure which shows the construction method of the inner tank 3a LNGタンク100を示す図Diagram showing LNG tank 100

以下、図面に基づいて本発明の好適な実施形態について詳細に説明する。   Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

図1は、本発明の実施形態に係る貯留槽の構築方法について示す図であり、側壁鋼板31の配置を上から見た図である。   FIG. 1 is a view showing a construction method of a storage tank according to an embodiment of the present invention, and is a view of an arrangement of side wall steel plates 31 as viewed from above.

本実施形態では、貯留槽として、図11に示すLNGタンク100の内槽3aを構築する。その際、図1に示すように、構築途中の防液堤2の内側で、内槽3aの側壁を形成するための周方向の帯状の側壁鋼板31を、タンクの内外方向(径方向)に複数層重ねて仮置きする。側壁鋼板31は、内槽3aの最上段の側壁鋼板が最内側(1層目)に、最下段の側壁鋼板が最外側に来るように配置される。   In this embodiment, the inner tank 3a of the LNG tank 100 shown in FIG. 11 is constructed as a storage tank. At that time, as shown in FIG. 1, a strip-shaped side wall steel plate 31 in the circumferential direction for forming the side wall of the inner tub 3a is formed in the inner and outer directions (radial direction) of the tank. Place multiple layers temporarily. The side wall steel plate 31 is disposed so that the uppermost side wall steel plate of the inner tub 3a is on the innermost side (first layer) and the lowermost side wall steel plate is on the outermost side.

側壁鋼板31はストック架台61で保持して配置される。その外側では、タンクの周方向に沿って複数のジャッキ62が設けられる。ジャッキ62は、防液堤2で反力をとり側壁鋼板31を内側に押圧するものである。   The side wall steel plate 31 is arranged while being held by the stock frame 61. On the outside thereof, a plurality of jacks 62 are provided along the circumferential direction of the tank. The jack 62 takes a reaction force at the liquid breakwater 2 and presses the side wall steel plate 31 inward.

図2(a)は側壁鋼板31の配置を外側から見た図、図2(b)は図1の線a−aに沿った鉛直方向の断面図である。   2A is a view of the arrangement of the side wall steel plates 31 as viewed from the outside, and FIG. 2B is a vertical cross-sectional view along the line aa in FIG.

本実施形態において、側壁鋼板31は、略矩形板状の複数の鋼板部材310の鉛直方向の辺同士を接合し、周方向に連続させて形成される。なお、鋼板部材310は内槽3aの径に応じた若干の反り(曲げ加工)を有している。   In this embodiment, the side wall steel plate 31 is formed by joining the sides in the vertical direction of a plurality of substantially rectangular plate-shaped steel plate members 310 and continuously in the circumferential direction. The steel plate member 310 has a slight warp (bending) according to the diameter of the inner tank 3a.

鋼板部材310は、構築途中の防液堤2が所定の高さに達する前に、図2(b)に示すようにクレーン等で防液堤2を越えて防液堤2の内側へと全て吊り込まれる。吊込んだ鋼板部材310はストック架台61に差し込み設置する。   The steel plate member 310 is completely passed over the liquid breakwater 2 and inside the liquid breakwater 2 with a crane or the like as shown in FIG. 2 (b) before the liquid breakwater 2 in the middle of construction reaches a predetermined height. Suspended. The suspended steel plate member 310 is inserted into the stock frame 61 and installed.

ストック架台61は、タンクの径方向に沿って底版5上に固定した桟木611上に、内外一対の保持柱612を立設したものである。保持柱612は、桟木611と保持柱612の間で斜め方向に設けた支持材613によって支持される。ストック架台61の両保持柱612の間には、傾斜板614が設けられる。傾斜板614の上面はタンクの中心に向かって下降する。本実施形態では、図2(a)に示すように、1枚の鋼板部材310が複数のストック架台61によって保持される。   The stock pedestal 61 has a pair of inner and outer holding columns 612 erected on a pier 611 fixed on the bottom slab 5 along the radial direction of the tank. The holding column 612 is supported by a support member 613 provided in an oblique direction between the crosspiece 611 and the holding column 612. An inclined plate 614 is provided between the holding columns 612 of the stock mount 61. The upper surface of the inclined plate 614 descends toward the center of the tank. In the present embodiment, as shown in FIG. 2A, one steel plate member 310 is held by a plurality of stock mounts 61.

こうして鋼板部材310をタンクの周方向に順次配置し、隣り合う鋼板部材310の鉛直方向の辺同士を外側から1層シール溶接する。図2(b)の33はこの溶接箇所を示したものであり、図3(a)は隣り合う鋼板部材310同士の溶接箇所33を示す水平方向の断面図である。図3(a)では、図の下方が外側に対応する。   In this way, the steel plate members 310 are sequentially arranged in the circumferential direction of the tank, and the vertical sides of the adjacent steel plate members 310 are subjected to one-layer seal welding from the outside. Reference numeral 33 in FIG. 2B shows this welding location, and FIG. 3A is a horizontal cross-sectional view showing the welding location 33 between adjacent steel plate members 310. In FIG. 3A, the lower side of the figure corresponds to the outside.

以上の作業を鋼板部材310を投入する毎に行い、鋼板部材310を周方向に連続させて側壁鋼板31が形成される。以下同様の作業を繰り返し、最内側の側壁鋼板31から最外側の側壁鋼板31まで順に形成してゆく。側壁鋼板31は、ストック架台61の傾斜板614上で内外に重ねて配置される。   The above operation is performed every time the steel plate member 310 is introduced, and the side wall steel plate 31 is formed by continuing the steel plate member 310 in the circumferential direction. Thereafter, the same operation is repeated to sequentially form the innermost side wall steel plate 31 to the outermost side wall steel plate 31. The side wall steel plate 31 is arranged on the inclined plate 614 of the stock mount 61 so as to overlap inside and outside.

本実施形態では、図1に示すように、最内側(1層目)の側壁鋼板31を環状に連続させる。それより外側(2層目以降)の側壁鋼板31は、平面C字状に連続させる。図2(a)、(b)に示すように、2層目以降の側壁鋼板31の上縁の外側には、側壁鋼板31から上方に突出する仮受ピース311が取り付けられる。   In the present embodiment, as shown in FIG. 1, the innermost (first layer) side wall steel plate 31 is continuously annularly formed. The outer side wall steel plate 31 on the outer side (second and subsequent layers) is continued in a plane C shape. As shown in FIGS. 2A and 2B, a temporary receiving piece 311 that protrudes upward from the side wall steel plate 31 is attached to the outside of the upper edge of the second and subsequent side wall steel plates 31.

その他、防液堤2の内側には、内槽3aの屋根部分を形成するための屋根骨部材や屋根鋼板も、構築途中の防液堤2を越えてクレーン等で吊込まれる。   In addition, a roof frame member and a roof steel plate for forming a roof portion of the inner tub 3a are also suspended inside the liquid breakwater 2 by a crane or the like beyond the liquid breakwater 2 being constructed.

このように、本実施形態では、内槽3aを構築するためのほぼ全ての資材を、防液堤2が所定高さ、例えば10m程度の高さに達する前に、構築途中の防液堤2の上から吊込んで防液堤2の内側に搬送する。そのため防液堤2に資材搬入用の大きな開口部が不要である。なお、作業員通路、小型資機材搬入用の小さな開口部(不図示)については、防液堤2に別途設けられる。   As described above, in the present embodiment, almost all materials for constructing the inner tank 3a are disposed in the middle of the construction of the breakwater 2 before the breakwater 2 reaches a predetermined height, for example, about 10 m. It is hung from above and conveyed to the inside of the breakwater 2. Therefore, there is no need for a large opening for carrying material into the breakwater 2. Note that a worker passage and a small opening (not shown) for carrying in small materials and equipment are provided separately in the breakwater 2.

以上のようにして図1に示すように側壁鋼板31の仮置きを行った後、内槽3aの組み立てを開始する。内槽3aの組み立てに際しては、まず、仮置きした最内側の側壁鋼板31について、図3(b)に示すように、隣り合う鋼板部材310の鉛直方向の辺同士の溶接を内側から行う。この溶接は多層溶接とする。   After the temporary placement of the side wall steel plate 31 as shown in FIG. 1 as described above, the assembly of the inner tub 3a is started. When assembling the inner tub 3a, first, as shown in FIG. 3 (b), the side walls in the vertical direction of the adjacent steel plate members 310 are welded from the inner side to the temporarily placed innermost side wall steel plate 31. This welding is multilayer welding.

また図4に示すように、鋼製屋根32を最内側の側壁鋼板31の上縁に溶接して接合する。この鋼製屋根32は、例えば、底版5上の側壁鋼板31の内側で屋根骨部材や屋根鋼板を組み立てて形成したものである。   As shown in FIG. 4, the steel roof 32 is welded and joined to the upper edge of the innermost side wall steel plate 31. The steel roof 32 is formed, for example, by assembling a roof bone member or a roof steel plate inside the side wall steel plate 31 on the bottom plate 5.

側壁鋼板31と鋼製屋根32との溶接箇所の検査が完了すると、図5(a)に示すように、鋼製屋根32および最内側の側壁鋼板31を、ジャッキアップまたはエアーレイジングで押し上げる。エアーレイジングを行う場合は、最内側の側壁鋼板31の下端部等に空気漏れ防止用のスカート等を取付けた上でブロワー(送風機)等により押し上げる。大型のブロワー等を用いることにより、押し上げに十分な内圧が得られる。   When the inspection of the welded portion between the side wall steel plate 31 and the steel roof 32 is completed, the steel roof 32 and the innermost side wall steel plate 31 are pushed up by jack-up or air lasing as shown in FIG. When performing air lasing, a skirt or the like for preventing air leakage is attached to the lower end of the innermost side wall steel plate 31 and then pushed up by a blower (blower) or the like. By using a large blower or the like, an internal pressure sufficient for pushing up can be obtained.

なお、最内側の側壁鋼板31の下縁の内側には、側壁鋼板31から下方に突出する仮受ピース312を取付けておく。仮受ピース312は仮置き時に側壁鋼板31に取付けておいてもよい。   A temporary receiving piece 312 protruding downward from the side wall steel plate 31 is attached to the inner side of the lower edge of the innermost side wall steel plate 31. The temporary receiving piece 312 may be attached to the side wall steel plate 31 during temporary placement.

こうして、図5(b)に示すように、最内側(1層目)の側壁鋼板31を、残りの側壁鋼板31のうち新たに最内側となった(2層目の)側壁鋼板31の上まで上昇させるとともに、2層目以降の側壁鋼板31は、ジャッキ62によって矢印bに示すように外側から内側へとタンクの中心に向かって押し込む。これにより、上昇させた1層目の側壁鋼板31の真下に2層目の側壁鋼板31を位置させる。   Thus, as shown in FIG. 5B, the innermost (first layer) side wall steel plate 31 is replaced with the innermost (second layer) side wall steel plate 31 among the remaining side wall steel plates 31. The side wall steel plates 31 of the second and subsequent layers are pushed into the center of the tank from the outside to the inside as indicated by the arrow b by the jack 62. As a result, the second-layer side wall steel plate 31 is positioned directly below the raised first-layer side wall steel plate 31.

図6はジャッキ62による押圧方法を示す図であり、図1と同様、側壁鋼板31の配置を上から見た図である。図6では、上昇させた1層目の側壁鋼板31の図示を省略している。   FIG. 6 is a view showing a pressing method by the jack 62, and is a view of the arrangement of the side wall steel plates 31 as seen from above, as in FIG. In FIG. 6, the illustration of the raised first side wall steel plate 31 is omitted.

図6に示すように、ジャッキ62による側壁鋼板31の押圧は、平面C字状の側壁鋼板31のC字の開部から遠い位置から順に、左右対称に開部に向かって行う(図6の丸囲み数字「1」「2」「3」「4」…参照)。   As shown in FIG. 6, the pressing of the side wall steel plate 31 by the jack 62 is performed in a symmetrical manner toward the opening from the position far from the C-shaped opening of the flat C-shaped side wall steel plate 31 (FIG. 6). (See circled numbers “1”, “2”, “3”, “4”, ...).

これにより、側壁鋼板31がタンクの中心に向かって内側へと押し込まれ、図7に示すように、最内側(2層目)の側壁鋼板31の側端同士が閉合点31aにて突き当たる。なお、ジャッキ62による押圧時には、側壁鋼板31が傾斜板614(図2参照)に沿って滑り降りるので、側壁鋼板31の移動は容易である。   Thereby, the side wall steel plate 31 is pushed inward toward the center of the tank, and as shown in FIG. 7, the side ends of the innermost side (second layer) side wall steel plates 31 abut each other at the closing point 31a. In addition, since the side wall steel plate 31 slides down along the inclined plate 614 (refer FIG. 2) at the time of the press by the jack 62, the movement of the side wall steel plate 31 is easy.

また、ジャッキ62で側壁鋼板31を押し込んだ際には、前記の仮受ピース311、312により、上昇させた1層目の側壁鋼板31の下縁と、ジャッキ62で押し込んだ2層目の側壁鋼板31の上縁との位置合わせが容易にできる。   Further, when the side wall steel plate 31 is pushed in by the jack 62, the lower edge of the first side wall steel plate 31 raised by the temporary receiving pieces 311 and 312 and the second side wall pushed in by the jack 62 are used. Position alignment with the upper edge of the steel plate 31 can be performed easily.

図8はこれを示す図である。すなわち、図8(a)の矢印cに示すように1層目の側壁鋼板31を上昇させ、矢印dに示すように2層目以降の側壁鋼板31を外側から内側に押し込むと、図8(b)に示すように、2層目の側壁鋼板31の上縁の仮受ピース311が、上昇させた1層目の側壁鋼板31に外側から当接する。また、1層目の側壁鋼板31の下縁の仮受ピース312が、2層目の側壁鋼板31に内側から当接する。   FIG. 8 shows this. That is, when the first-layer side wall steel plate 31 is raised as shown by the arrow c in FIG. 8A and the second and subsequent side wall steel plates 31 are pushed inward from the outside as shown by the arrow d, FIG. As shown in b), the provisional receiving piece 311 at the upper edge of the second-layer side wall steel plate 31 comes into contact with the raised first-layer side wall steel plate 31 from the outside. In addition, the provisional piece 312 at the lower edge of the first-layer side wall steel plate 31 is in contact with the second-layer side wall steel plate 31 from the inside.

このような仮受ピース311、312と側壁鋼板31との当接により、上昇させた1層目の側壁鋼板31の下縁と、ジャッキ62で押し込んだ2層目の側壁鋼板31の上縁の位置合わせを容易に行うことができる。   Due to the contact between the provisional pieces 311 and 312 and the side wall steel plate 31, the lower edge of the first side wall steel plate 31 raised and the upper edge of the second side wall steel plate 31 pushed in by the jack 62 are provided. Positioning can be performed easily.

その後、この2層目の側壁鋼板31の閉合点31a(図7参照)にて、前記の図3(a)と同様、隣り合う鋼板部材310の鉛直方向の辺同士を外側から溶接して閉合し、環状にする。   Thereafter, at the closing point 31a (see FIG. 7) of the second side wall steel plate 31, the sides in the vertical direction of the adjacent steel plate members 310 are welded together from the outside in the same manner as in FIG. 3 (a). And make it circular.

また、前記の図3(b)と同様、2層目の側壁鋼板31の隣り合う鋼板部材310の鉛直方向の辺同士は、内側からも溶接される。   Similarly to FIG. 3 (b), the sides in the vertical direction of the adjacent steel plate members 310 of the second-layer side wall steel plate 31 are also welded from the inside.

さらに、図8(c)の溶接箇所34に示すように、上昇させた1層目の側壁鋼板31の下縁と、その下方の2層目の側壁鋼板31の上縁とを、外側および内側から溶接して接合する。溶接が完了したら、仮受ピース311、312は取り外す。   8C, the lower edge of the raised first side wall steel plate 31 and the upper edge of the second side wall steel plate 31 below the outer side and the inner side are formed. Weld and join. When welding is completed, the temporary receiving pieces 311 and 312 are removed.

ここで、各仮受ピース311、312の側壁鋼板側には切欠き311a、312aが設けられており、切欠き311a、312aの内側で、上下の側壁鋼板31の溶接が好適に行えるようになっている。なお、仮受ピース311、312の形状はこれに限らず、また溶接を行うための孔を設けることなども可能である。   Here, notches 311a and 312a are provided on the side wall steel plates of the provisional pieces 311 and 312 so that the upper and lower side wall steel plates 31 can be suitably welded inside the notches 311a and 312a. ing. Note that the shapes of the provisional receiving pieces 311 and 312 are not limited thereto, and it is also possible to provide holes for welding.

この後、3層目の側壁鋼板31についても、図5〜図8で説明した手順で2層目の側壁鋼板31の下に接合する。   Thereafter, the third-layer side wall steel plate 31 is also joined below the second-layer side wall steel plate 31 by the procedure described with reference to FIGS.

即ち、図9(a)に示すように、2層目の側壁鋼板31の下縁に前記と同様の仮受ピース312を取付け、鋼製屋根32および1層目、2層目の側壁鋼板31を上昇させる。   That is, as shown in FIG. 9A, the same provisional piece 312 as above is attached to the lower edge of the second-layer side wall steel plate 31, and the steel roof 32 and the first and second-layer side wall steel plates 31 are attached. To raise.

また図9(b)の矢印bに示すように、残りの(3層目以降の)側壁鋼板31を、前記と同様ジャッキ62によって外側から内側に押し込んで、上昇させた2層目の側壁鋼板31の下縁と、残りの側壁鋼板31のうち新たに最内側となった3層目の側壁鋼板31の上縁を位置合わせする。   Further, as shown by an arrow b in FIG. 9B, the remaining side wall steel plate 31 (from the third layer onward) is pushed inward from the outside by the jack 62 in the same manner as described above, and raised to the second layer side wall steel plate. The lower edge of 31 and the upper edge of the third-layer side wall steel plate 31 that is newly the innermost side among the remaining side wall steel plates 31 are aligned.

ジャッキ62での押し込みにより、図7と同様、3層目の側壁鋼板31の側端同士が閉合点にて突き当たるので、図3(a)と同様、閉合点にて隣り合う鋼板部材310の鉛直方向の辺同士を外側から溶接して閉合し、環状にする。   Since the side ends of the third-layer side wall steel plates 31 abut each other at the closing point as in FIG. 7 due to the pushing with the jack 62, the vertical positions of the adjacent steel plate members 310 at the closing point are the same as in FIG. The sides in the direction are welded from the outside and closed to form an annular shape.

また、図3(b)と同様、3層目の側壁鋼板31の隣り合う鋼板部材310の鉛直方向の辺同士は、内側からも溶接される。さらに、図8(c)と同様、上昇させた2層目の側壁鋼板31の下縁と、3層目の側壁鋼板31の上縁を外側および内側から溶接し、接合する。その後、仮受ピース311、312は取り外す。   Further, as in FIG. 3B, the sides in the vertical direction of the adjacent steel plate members 310 of the third-layer side wall steel plate 31 are also welded from the inside. Further, similarly to FIG. 8C, the lower edge of the raised second-layer side wall steel plate 31 and the upper edge of the third-layer side wall steel plate 31 are welded and joined from outside and inside. Thereafter, the temporary receiving pieces 311 and 312 are removed.

以降同様の手順を繰り返して図10に示すように全ての側壁鋼板31を上下に接合し、最下段の側壁鋼板31の下縁を底部プレート(不図示)に取り付けることで、内槽3aが構築される。   Thereafter, the same procedure is repeated to join all the side wall steel plates 31 up and down as shown in FIG. 10, and the lower edge of the side wall steel plate 31 is attached to the bottom plate (not shown), thereby constructing the inner tank 3a. Is done.

これと並行して防液堤2等の構築を行うことで、図11のLNGタンク100が構築される。内槽3a用の資材搬入後は、防液堤2の構築作業を内槽3aの構築作業と並行することができ、開口部も作業員や小型資機材用の小さなものだけで良いので、早期に防液堤2を構築して迅速に開口部を閉じプレストレスを導入できる。   In parallel with this, the LNG tank 100 of FIG. 11 is constructed by constructing the breakwater 2 and the like. After the material for the inner tank 3a is brought in, the construction work of the breakwater 2 can be performed in parallel with the construction work of the inner tank 3a, and the opening is only small for workers and small materials and equipment. The liquid barrier 2 can be constructed to quickly close the opening and introduce prestress.

以上説明したように、本実施形態によれば、内槽3aの側壁鋼板31を内外に重ねて一旦仮置きし、その後、最内側の環状の側壁鋼板31を上昇させ、残りの平面C字状の側壁鋼板31を外側から押し込む。これにより、上昇させた側壁鋼板31の下縁に、押し込んだ側壁鋼板31の上縁の位置を合わせ、押し込んだ側壁鋼板31の閉合と上下の側壁鋼板31の接合を行い、以下これを繰り返す。これにより、一旦側壁鋼板31を仮置きした後は、手間を掛けずに内槽3aの側壁を効率よく構築でき、追加の資材搬入もほぼ不要である。   As described above, according to the present embodiment, the side wall steel plates 31 of the inner tub 3a are temporarily placed on the inside and outside, and then temporarily placed, and then the innermost annular side wall steel plate 31 is raised, and the remaining plane C-shaped. The side wall steel plate 31 is pushed in from the outside. Thereby, the position of the upper edge of the pushed side wall steel plate 31 is aligned with the lower edge of the raised side wall steel plate 31, the closed side wall steel plate 31 is closed and the upper and lower side wall steel plates 31 are joined. Thereby, once the side wall steel plate 31 is temporarily placed, the side wall of the inner tub 3a can be efficiently constructed without taking time and almost no additional material loading is required.

また、側壁鋼板31は鋼板部材310を周方向に連続させて形成し、鋼板部材310等を防液堤2の構築途中の早期に防液堤2の上から防液堤2の内側に搬入することで、内槽3a用の資材搬入を短期間で済ませることができる。資材搬入後は内槽3aと防液堤2の構築作業を並行することができる。また、防液堤2に資材搬入用の大きな開口部が不要となり、作業員通路等に用いる小さな開口部だけでよいから、開口部の閉塞作業には時間を要さず、防液堤2に迅速にプレストレスを導入できる。結果、タンク施工時の全体工期を短縮できる。   Further, the side wall steel plate 31 is formed by continuously forming the steel plate member 310 in the circumferential direction, and the steel plate member 310 and the like are carried into the inside of the breakwater 2 from the top of the breakwater 2 at an early stage during the construction of the breakwater 2. Thus, the material loading for the inner tank 3a can be completed in a short period of time. The construction work of the inner tank 3a and the breakwater 2 can be performed in parallel after the material is carried in. Moreover, since the large opening part for material conveyance is unnecessary in the liquid breakwater 2 and only a small opening part used for a worker channel | path etc. is needed, it does not require time for the obstruction | occlusion work of an opening part, and the liquid breakwater 2 Prestress can be introduced quickly. As a result, it is possible to shorten the overall construction period for tank construction.

さらに、前記したように仮受ピース311、312を取付けることで、上下の側壁鋼板31の位置合わせが容易にできる。仮受ピース311、312に孔や切欠きを設けることで、上下の側壁鋼板31の溶接も好適に行える。また、仮置きした側壁鋼板31は、C字の開部から遠い位置から順にジャッキで押し込むことで、C字の側壁鋼板31を内側へ押し込みつつ、その側端同士を好適に突き合わせることができる。   Further, as described above, by attaching the temporary receiving pieces 311 and 312, the upper and lower side wall steel plates 31 can be easily aligned. By providing holes and notches in the provisional pieces 311 and 312, welding of the upper and lower side wall steel plates 31 can be suitably performed. Moreover, the temporarily placed side wall steel plate 31 can be suitably abutted between the side edges while pushing the C side wall steel plate 31 inwardly by pushing in with a jack in order from a position far from the C-shaped opening. .

しかしながら、本発明はこれに限らない。例えば、本発明は、前記したLNGタンク100の内槽3aに限らず、石油タンクなど金属製の一重殻タンクの構築方法としても適用できる。   However, the present invention is not limited to this. For example, the present invention is not limited to the inner tank 3a of the LNG tank 100 described above, and can also be applied as a method for constructing a metal single shell tank such as an oil tank.

以上、添付図面を参照して、本発明の好適な実施形態について説明したが、本発明は係る例に限定されない。当業者であれば、本願で開示した技術的思想の範疇内において、各種の変更例または修正例に想到し得ることは明らかであり、それらについても当然に本発明の技術的範囲に属するものと了解される。   The preferred embodiments of the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to such examples. It will be apparent to those skilled in the art that various changes or modifications can be conceived within the scope of the technical idea disclosed in the present application, and these are naturally within the technical scope of the present invention. Understood.

2;防液堤
3a;内槽
3b;外槽
4;杭
5;底版
7;地盤
31;側壁鋼板
32;鋼製屋根
33、34;溶接箇所
61;ストック架台
62;ジャッキ
310;鋼板部材
311、312;仮受ピース
311a、312a;切欠き
100;LNGタンク
2; liquid breakwater 3a; inner tub 3b; outer tub 4; pile 5; bottom slab 7; ground 31; side wall steel plate 32; steel roof 33 and 34;
311 and 312; provisional pieces 311a and 312a; notch 100; LNG tank

Claims (8)

貯留槽の構築方法であって、
前記貯留槽の側壁を形成するための前記貯留槽の側壁鋼板を、内外方向に複数重ねて仮置きする工程(a)と、
最内側の環状の側壁鋼板を上昇させ、平面C字状の残りの側壁鋼板を外側から内側へ向かって押し込み、上昇させた側壁鋼板の下縁と、残りの側壁鋼板のうち新たに最内側となった側壁鋼板の上縁の位置を合わせ、前記新たに最内側となった側壁鋼板の側端同士、および、当該側壁鋼板の上縁と前記上昇させた側壁鋼板の下縁を接合する工程(b)と、
を有することを特徴とする貯留槽の構築方法。
A storage tank construction method,
A step (a) of temporarily placing a plurality of the side wall steel plates of the storage tank to form the side walls of the storage tank in an inner and outer direction;
Raise the innermost annular side wall steel plate, push the remaining flat C-shaped side wall steel plate inward from the outside to the inside, and newly raise the innermost side of the remaining side wall steel plate and the lower edge of the raised side wall steel plate The step of aligning the position of the upper edge of the side wall steel plate and joining the side edges of the side wall steel plate that has become the innermost side, and the upper edge of the side wall steel plate and the lower edge of the raised side wall steel plate ( b) and
A storage tank construction method characterized by comprising:
前記工程(a)において、前記側壁鋼板は、複数の鋼板部材の鉛直方向の辺同士の外側を接合し周方向に連続させて形成されることを特徴とする請求項1に記載の貯留槽の構築方法。   2. The storage tank according to claim 1, wherein in the step (a), the sidewall steel plates are formed by joining the outer sides of the vertical sides of a plurality of steel plate members and continuing in the circumferential direction. Construction method. 前記貯留槽は、防液堤の内側に設けられるものであり、
前記工程(a)では、構築途中の前記防液堤の上から前記防液堤の内側に搬送した複数の鋼板部材を接合することにより、前記防液堤の内側で前記側壁鋼板が形成されることを特徴とする請求項2に記載の貯留槽の構築方法。
The storage tank is provided inside the liquid breakwater,
In the step (a), the side wall steel plate is formed inside the liquid breakwater by joining a plurality of steel plate members conveyed to the inside of the liquid breakwater from above the liquid breakwater in the middle of construction. The construction method of the storage tank of Claim 2 characterized by the above-mentioned.
前記工程(b)では、前記上昇させた側壁鋼板の下縁と、前記残りの側壁鋼板のうち最内側の側壁鋼板の上縁とに取付けられた仮受ピースにより、位置合わせが行われることを特徴とする請求項1から請求項3のいずれかに記載の貯留槽の構築方法。   In the step (b), alignment is performed by a provisional piece attached to the lower edge of the raised side wall steel plate and the upper edge of the innermost side wall steel plate among the remaining side wall steel plates. The construction method of the storage tank according to any one of claims 1 to 3, wherein the storage tank is constructed. 前記仮受ピースでは、孔または切欠きが形成されることを特徴とする請求項4記載の貯留槽の構築方法。   The method for constructing a storage tank according to claim 4, wherein a hole or a notch is formed in the provisional piece. 前記工程(a)において、前記側壁鋼板がストック架台で保持されることを特徴とする請求項1から請求項5のいずれかに記載の貯留槽の構築方法。   The method for constructing a storage tank according to any one of claims 1 to 5, wherein in the step (a), the side wall steel plate is held by a stock frame. 前記工程(b)で側壁鋼板を外側から内側へと押し込む際は、複数のジャッキを用いて、C字の開部分から遠い位置から順に、前記側壁鋼板を内側へ押圧することを特徴とする請求項1から請求項6のいずれかに記載の貯留槽の構築方法。   When pushing the side wall steel plate from the outside to the inside in the step (b), the side wall steel plate is pressed inward in order from a position far from the C-shaped open portion using a plurality of jacks. The construction | assembly method of the storage tank in any one of Claims 1-6. 請求項1から請求項7のいずれかに記載の貯留槽の構築方法によって構築された貯留槽。   The storage tank constructed | assembled by the construction method of the storage tank in any one of Claims 1-7.
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