JP2019031820A - Underground tank and construction method of underground tank - Google Patents

Underground tank and construction method of underground tank Download PDF

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Publication number
JP2019031820A
JP2019031820A JP2017153004A JP2017153004A JP2019031820A JP 2019031820 A JP2019031820 A JP 2019031820A JP 2017153004 A JP2017153004 A JP 2017153004A JP 2017153004 A JP2017153004 A JP 2017153004A JP 2019031820 A JP2019031820 A JP 2019031820A
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underground
continuous wall
underground continuous
tank
outer peripheral
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幹雄 柏木
Mikio Kashiwagi
幹雄 柏木
藤永　友三郎
Tomosaburo Fujinaga
友三郎 藤永
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Shimizu Construction Co Ltd
Shimizu Corp
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Shimizu Construction Co Ltd
Shimizu Corp
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Abstract

To provide an underground tank and a construction method of underground tank capable of reducing the construction period.SOLUTION: An underground tank 1 comprises: an underground continuous wall 5 constructed in the ground G and formed in a cylindrical shape; a tank main body 10 constructed inside the underground continuous wall 5 and capable of storing liquid; and a side heater 6 set along the outer peripheral surface 5a of the underground continuous wall 5. The tank main body 10 has a bottom plate 2 installed below the ground G surface having a substantially circular plan view, a substantially cylindrical side wall 3, and a domed roof 4 supported by the upper end portion 3a of the side wall 3. Multiple side heaters 6 are disposed along the outer peripheral surface 5a of the underground continuous wall 5.SELECTED DRAWING: Figure 1

Description

本発明は、地下タンク及び地下タンクの施工方法に関するものである。   The present invention relates to an underground tank and an underground tank construction method.

従来から、液化天然ガス（ＬＮＧ）等の低温液体は、地中に埋設された地下タンクに貯蔵されている。地下タンクは、底版と、底版の周囲に沿って構築された側壁と、側壁の上部を覆う屋根と、を備えている。この地下タンク内の液体の冷熱により、地下タンク周辺の地盤が凍結することを防止するために、地下タンクの側方（側壁の外方）等に側部ヒータが設置されたものが広く知られている（下記の特許文献１〜３参照）。   Conventionally, low-temperature liquids such as liquefied natural gas (LNG) are stored in underground tanks buried in the ground. The underground tank includes a bottom plate, a side wall constructed around the bottom plate, and a roof covering an upper portion of the side wall. In order to prevent the ground around the underground tank from freezing due to the cold heat of the liquid in the underground tank, it is widely known that a side heater is installed on the side of the underground tank (outside the side wall). (See Patent Documents 1 to 3 below).

このような地下タンクの施工手順としては、地中に筒状の地中連続壁を構築し、地中連続壁の内部を掘削して、底版、側壁、屋根等の躯体を構築し、最後に盛土を行っている。一方、側部ヒータの設置は、側壁の構築後に側部ヒータを設置するための穴を掘削（削孔）し、盛土をする際に穴内に側部ヒータを設置している。   The construction procedure for such underground tanks is to build a cylindrical underground continuous wall in the ground, excavate the interior of the underground continuous wall, and build a frame such as a bottom plate, side walls, and roof. Performing embankment. On the other hand, the side heater is installed by excavating (drilling) a hole for installing the side heater after the side wall is constructed, and installing the side heater in the hole when embankment is performed.

特開２０００−２８２４９５号公報JP 2000-282495 A 特開昭６２−８３５９９号公報JP-A-62-83599 特開平６−２２１０２８号公報JP-A-6-221028

しかしながら、側部ヒータの削孔作業は屋根の構築作業と時期が重なるとともに、側部ヒータの設置作業は盛土作業と時期が重なるため、屋根の構築作業や盛土作業が側部ヒータの削孔作業や設置作業に影響を与える（あるいは、側部ヒータの削孔作業や設置作業が屋根の構築作業や盛土作業に影響を与える）クリティカルパスとなっているという問題点がある。   However, the side heater drilling work overlaps with the roof construction work, and the side heater installation work overlaps with the embankment work, so the roof construction work and embankment work is the side heater drilling work. There is a problem that it is a critical path that affects the installation work (or the side heater drilling work or installation work affects the roof construction work or the banking work).

そこで、本発明は、上記事情に鑑みてなされたものであり、工期を短縮できる地下タンク及び地下タンクの施工方法を提供する。   Then, this invention is made | formed in view of the said situation, and provides the construction method of an underground tank and an underground tank which can shorten a construction period.

上記目的を達成するために、本発明は以下の手段を採用している。
すなわち、本発明に係る地下タンクは、地盤中に構築され、筒状に形成された地中連続壁と、該地中連続壁の内側に構築され、液体が貯蔵可能なタンク本体と、前記地中連続壁の外周面に沿って設置された側部ヒータと、を備えることを特徴とする。 In order to achieve the above object, the present invention employs the following means.
That is, the underground tank according to the present invention is constructed in the ground and formed into a cylindrical continuous wall, a tank body that is constructed inside the continuous underground wall and can store liquid, and the ground And a side heater installed along the outer peripheral surface of the middle continuous wall.

このように構成された地下タンクでは、側部ヒータは地中連続壁の外周面に沿って設置されるため、側部ヒータを設置するための穴と地中連続壁を構築するための穴とを連通させて掘削することができる。よって、側部ヒータ用の穴及び地中連続壁用の穴を同時に掘削できるため、それぞれの穴を別々に掘削するよりも工期を短縮することができる。   In the underground tank configured as described above, the side heater is installed along the outer peripheral surface of the underground continuous wall, so that a hole for installing the side heater and a hole for constructing the underground continuous wall are provided. Can be excavated. Therefore, since the hole for the side heater and the hole for the underground continuous wall can be excavated at the same time, the construction period can be shortened compared to excavating each hole separately.

また、本発明に係る地下タンクでは、前記側部ヒータは、前記地中連続壁の外周面に沿って複数設置されていることが好ましい。   Moreover, in the underground tank which concerns on this invention, it is preferable that the said side part heater is installed with two or more along the outer peripheral surface of the said underground continuous wall.

このように構成された地下タンクでは、側部ヒータ用の複数の穴を地中連続壁用の穴と同時に掘削でき、効率的に作業を進めることができる。   In the underground tank configured as described above, a plurality of holes for the side heaters can be excavated simultaneously with the holes for the underground continuous wall, and work can be efficiently performed.

また、本発明に係る地下タンクの施工方法は、地盤中に構築され、筒状に形成された地中連続壁と、該地中連続壁の内側に構築され、液体が貯蔵可能なタンク本体と、前記地中連続壁の外周面に沿って設置された側部ヒータと、を備える地下タンクの施工方法であって、前記地盤中に、前記地中連続壁及び前記側部ヒータが設置される略環状の穴部を一体として掘削する削孔工程と、前記穴部の内周側に前記地中連続壁を構築する地中連続壁構築工程と、前記穴部の外周側に前記側部ヒータを設置する側部ヒータ設置工程と、前記地中連続壁の内側にタンク本体を構築するタンク本体構築工程と、を備えること特徴とする。   The underground tank construction method according to the present invention includes a continuous underground wall formed in the ground and formed into a cylindrical shape, and a tank body that is built inside the continuous underground wall and can store liquid. An underground tank construction method comprising: a side heater installed along an outer peripheral surface of the underground continuous wall, wherein the underground continuous wall and the side heater are installed in the ground A drilling step for excavating a substantially annular hole as a unit, a underground continuous wall construction step for constructing the underground continuous wall on the inner peripheral side of the hole, and the side heater on the outer peripheral side of the hole And a tank body construction step of constructing a tank body inside the underground continuous wall.

このように構成された地下タンクの施工方法では、側部ヒータは地中連続壁の外周面に沿って設置されるため、側部ヒータを設置するための穴と地中連続壁を構築するための穴とを連通して（一体となった穴部として）掘削することができる。よって、側部ヒータ用の穴及び地中連続壁用の穴を同時に掘削できるため、それぞれの穴を別々に掘削するよりも工期を短縮することができる。
また、側部ヒータ設置工程がクリティカルパスから外れるため、従来と比較して工期短縮を図ることができる。 In the construction method of the underground tank configured in this way, the side heater is installed along the outer peripheral surface of the underground continuous wall, so that the hole for installing the side heater and the underground continuous wall are constructed. Can be excavated by communicating with the other hole (as an integrated hole). Therefore, since the hole for the side heater and the hole for the underground continuous wall can be excavated at the same time, the construction period can be shortened compared to excavating each hole separately.
Moreover, since the side heater installation process deviates from the critical path, the work period can be shortened compared to the conventional method.

本発明に係る地下タンク及び地下タンクの施工方法によれば、工期を短縮することができる。   According to the underground tank and the underground tank construction method according to the present invention, the construction period can be shortened.

本発明の一実施形態に係る地下タンクを示す模式的な縦断面図である。It is a typical longitudinal section showing an underground tank concerning one embodiment of the present invention. 本発明の一実施形態に係る地下タンクを示す模式的な平面図である。It is a typical top view showing an underground tank concerning one embodiment of the present invention.

本発明の一実施形態に係る地下タンク及び地下タンクの施工方法について、図面を用いて説明する。
まず、地下タンクについて説明する。
図１は、本発明の一実施形態に係る地下タンクを示す模式的な縦断面図である。図２は、本発明の一実施形態に係る地下タンクを示す模式的な平面図である。
図１及び図２に示すように、本実施形態に係る地下タンク１は、例えば、ＬＮＧ貯蔵タンクとして使用されるものである。地下タンク１は、タンク本体１０と、タンク本体１０の外周面に沿って構築された地中連続壁５と、地中連続壁５の外周面５ａに沿って設けられた側部ヒータ６と、を備えている。 An underground tank and an underground tank construction method according to an embodiment of the present invention will be described with reference to the drawings.
First, the underground tank will be described.
FIG. 1 is a schematic longitudinal sectional view showing an underground tank according to an embodiment of the present invention. FIG. 2 is a schematic plan view showing an underground tank according to an embodiment of the present invention.
As shown in FIG.1 and FIG.2, the underground tank 1 which concerns on this embodiment is used as an LNG storage tank, for example. The underground tank 1 includes a tank body 10, an underground continuous wall 5 constructed along the outer peripheral surface of the tank main body 10, a side heater 6 provided along the outer peripheral surface 5a of the underground continuous wall 5, It has.

タンク本体１０は、地盤Ｇ面よりも下方に設置された平面視略円形状の底版２と、略円筒状の側壁３と、側壁３の上端部３ａに支持されたドーム状の屋根４と、を有している。   The tank body 10 includes a bottom plate 2 having a substantially circular shape in plan view installed below the ground G surface, a substantially cylindrical side wall 3, and a dome-shaped roof 4 supported by the upper end 3 a of the side wall 3, have.

底版２は、鉄筋コンクリート造で、掘削された地盤Ｇ上に設けられた砕石層１１の上部に構築されている。底版２の内部には、地下タンク１内の温度調整を行う底部ヒータ（不図示）が設置されている。   The bottom slab 2 is made of reinforced concrete, and is constructed on the crushed stone layer 11 provided on the ground G excavated. A bottom heater (not shown) for adjusting the temperature in the underground tank 1 is installed inside the bottom plate 2.

側壁３は、鉄筋コンクリート造で、下端部３ｂが底版２の外縁部２ａに剛に接合されている。底版２及び側壁３により、有底円筒状に構成されている。底版２及び側壁３の内面には、図示しない保冷材及びメンブレン材が設置されている。   The side wall 3 is made of reinforced concrete, and the lower end 3 b is rigidly joined to the outer edge 2 a of the bottom plate 2. The bottom plate 2 and the side wall 3 form a bottomed cylindrical shape. On the inner surfaces of the bottom plate 2 and the side wall 3, a cold insulating material and a membrane material (not shown) are installed.

側壁３の上部側の外周には地下タンク１の施工中に盛土されているため、地下タンク１は地下に配置された構成となっている。   Since the outer periphery of the upper side of the side wall 3 is embanked during construction of the underground tank 1, the underground tank 1 is configured to be disposed underground.

屋根４は、鉄筋コンクリート造で、平面視において円形状に形成され、側壁３の上端部３ａに接続されている。   The roof 4 is made of reinforced concrete, has a circular shape in plan view, and is connected to the upper end 3 a of the side wall 3.

また、側壁３の下端部３ｂ側の外周の地盤Ｇには、側壁３の外周面に沿った形状で平面視円環状の地中連続壁５が設けられている。   The ground G on the outer periphery on the lower end 3 b side of the side wall 3 is provided with an underground continuous wall 5 having an annular shape in plan view in a shape along the outer peripheral surface of the side wall 3.

地中連続壁５は、土留めとして地盤Ｇの崩落を防ぐ機能や止水機能を備えている。地中連続壁５は、地下タンク１の底版２よりもさらに深く構築されており、下端部５ｂは難透水層（洪積粘性土層）１３まで達している。地中連続壁５は、例えば、鉄筋コンクリートなどで構築されている。   The underground continuous wall 5 has a function of preventing the ground G from collapsing and a water stop function as a soil retaining. The underground continuous wall 5 is constructed deeper than the bottom slab 2 of the underground tank 1, and the lower end portion 5 b reaches the hardly permeable layer (cold clay layer) 13. The underground continuous wall 5 is constructed of, for example, reinforced concrete.

地中連続壁５の外周面５ａに沿って、複数の側部ヒータ６が設置されている。側部ヒータ６は、地中連続壁５の外周面に近接配置されている。側部ヒータ６は、地中連続壁５の周方向に間隔を有して配置されている。側部ヒータ６は、地盤Ｇの凍結膨張を抑制するためのものである。本実施形態では、側部ヒータ６は、平面視略円形状をなしている。例えば、側部ヒータ６は、温水を流すため２重構造で構成されている。   A plurality of side heaters 6 are installed along the outer peripheral surface 5 a of the underground continuous wall 5. The side heater 6 is disposed close to the outer peripheral surface of the underground continuous wall 5. The side heaters 6 are arranged at intervals in the circumferential direction of the underground continuous wall 5. The side heater 6 is for suppressing freezing and expansion of the ground G. In the present embodiment, the side heater 6 has a substantially circular shape in plan view. For example, the side heater 6 has a double structure for flowing warm water.

次に、上述した地下タンク１の施工方法について説明する。
予め、地盤改良工事や、地盤Ｇの表層部を盤下げ掘削し周囲の地盤Ｇよりも低くなるようにする地盤表層部掘削工事を行っておく。 Next, the construction method of the above-described underground tank 1 will be described.
In advance, ground improvement work or ground surface layer excavation work for lowering the surface layer portion of the ground G so as to be lower than the surrounding ground G is performed.

（削孔工程）
地中連続壁５及び側部ヒータ６の設置予定箇所に沿って、略環状の掘削溝（穴部）７を設ける。平面視で、地中連続壁５は環状をなし、側部ヒータ６は円形状をなし地中連続壁５の外周面５ａに沿って複数設置されている。つまり、掘削溝７は、平面視環状に形成された環状部７ａと、環状部７ａに連通し平面視円形状をなす複数の円形状部７ｂとにより形成されている。後工程で、環状部７ａには地中連続壁５が構築され、円形状部７ｂには側部ヒータ６が設置される。 (Drilling process)
A substantially annular excavation groove (hole) 7 is provided along the planned installation location of the underground continuous wall 5 and the side heater 6. In plan view, the underground continuous wall 5 has an annular shape, and the side heaters 6 have a circular shape, and a plurality of side heaters 6 are installed along the outer peripheral surface 5 a of the underground continuous wall 5. That is, the excavation groove 7 is formed by an annular portion 7a formed in an annular shape in plan view and a plurality of circular portions 7b that communicate with the annular portion 7a and have a circular shape in plan view. In the subsequent process, the underground continuous wall 5 is constructed in the annular portion 7a, and the side heater 6 is installed in the circular portion 7b.

（地中連続壁構築工程）
掘削溝７の内周側、つまり環状部７ａに、鉄筋を配置してコンクリートを打設する周知技術により、地中連続壁５を構築する。 (Underground continuous wall construction process)
The underground continuous wall 5 is constructed by a well-known technique of placing reinforcing bars and placing concrete on the inner peripheral side of the excavation groove 7, that is, the annular portion 7a.

（側部ヒータ設置工程）
掘削溝７の外周側、つまり各円形状部７ｂに、側部ヒータ６を設置する。 (Side heater installation process)
Side heaters 6 are installed on the outer peripheral side of the excavation groove 7, that is, on each circular portion 7b.

（タンク本体構築工程）
地中連続壁５の内部を掘削し、鉄筋を配置してコンクリートを打設する周知技術により、底版２、側壁３及び屋根４を構築する。
なお、側部ヒータ設置工程の段階では、側部ヒータ６の上端部側はまだ設置せずに、側壁３を構築後に、側部ヒータ６の上端部側を継ぎ足して、側部ヒータ６を側壁３の上端部と同じ高さまで延ばすようにしてもよい。この場合には、側壁３を構築する際に使用する足場を兼用して、側部ヒータ６の上端部側の継ぎ足し作業をすることができる。 (Tank body construction process)
The bottom slab 2, the side wall 3 and the roof 4 are constructed by a well-known technique of excavating the inside of the underground continuous wall 5 and placing concrete by placing reinforcing bars.
In addition, in the stage of the side heater installation process, the upper end side of the side heater 6 is not yet installed, and after the side wall 3 is constructed, the upper end side of the side heater 6 is added to connect the side heater 6 to the side wall. 3 may be extended to the same height as the upper end of 3. In this case, it is possible to perform an additional work on the upper end side of the side heater 6 by using also a scaffold used when the side wall 3 is constructed.

（盛土工程）
側壁３の外周面が地中に埋設されるように、側壁３の上端部３ａ付近の高さまで盛土を行う。 (Filling process)
Filling is performed to a height near the upper end portion 3a of the side wall 3 so that the outer peripheral surface of the side wall 3 is buried in the ground.

このように構成された地下タンク１及び地下タンク１の施工方法によれば、側部ヒータ６は地中連続壁５の外周面５ａに沿って設置されるため、側部ヒータ６を設置するために掘削する穴（円形状部７ｂ）と地中連続壁５を構築するための穴（環状部７ａ）とを連通して（一体となった掘削溝７として）掘削することができる。よって、側部ヒータ６用の複数の穴（円形状部７ｂ）及び地中連続壁５用の穴（環状部７ａ）を同時に掘削できるため、それぞれの穴を別々に掘削するよりも工期を短縮することができる。   According to the underground tank 1 and the construction method of the underground tank 1 configured as described above, the side heater 6 is installed along the outer peripheral surface 5a of the underground continuous wall 5, and therefore the side heater 6 is installed. The hole (circular part 7b) to be excavated and the hole (annular part 7a) for constructing the underground continuous wall 5 can be communicated (as an integrated excavation groove 7). Therefore, a plurality of holes for the side heater 6 (circular portion 7b) and a hole for the underground continuous wall 5 (annular portion 7a) can be excavated at the same time. can do.

また、側部ヒータ設置工程がクリティカルパスから外れる（盛土工程と重ならない）ため、従来と比較して工期短縮を図ることができる。   Moreover, since the side heater installation process deviates from the critical path (does not overlap with the embankment process), the construction period can be shortened compared to the conventional method.

なお、上述した実施の形態において示した各構成部材の諸形状や組み合わせ等は一例であって、本発明の主旨から逸脱しない範囲において設計要求等に基づき種々変更可能である。   The various shapes and combinations of the constituent members shown in the above-described embodiments are merely examples, and various modifications can be made based on design requirements and the like without departing from the gist of the present invention.

例えば、掘削溝７は、地中連続壁５が構築される環状部７ａと、側部ヒータ６が設置される円形状部７ｂとが連通して形成されていればよく、側部ヒータ６は地中連続壁５の外周面に当接して設置されていてもよいし、側部ヒータ６は地中連続壁５の外周面５ａに近接していれば離間して設置されていてもよい。   For example, the excavation groove 7 may be formed by communicating an annular portion 7a in which the underground continuous wall 5 is constructed and a circular portion 7b in which the side heater 6 is installed. The side heater 6 may be installed in contact with the outer peripheral surface of the underground continuous wall 5, or may be installed away from the outer peripheral surface 5 a of the underground continuous wall 5.

１…地下タンク
２…底版
３…側壁
４…屋根
５…地中連続壁
６…側部ヒータ
７…掘削溝（穴部）
７ａ…環状部
７ｂ…円形状部
１０…タンク本体
１１…砕石層
Ｇ…地盤 DESCRIPTION OF SYMBOLS 1 ... Underground tank 2 ... Bottom slab 3 ... Side wall 4 ... Roof 5 ... Underground continuous wall 6 ... Side heater 7 ... Excavation groove (hole)
7a ... annular portion 7b ... circular portion 10 ... tank body 11 ... crushed stone layer G ... ground

Claims (3)

地盤中に構築され、筒状に形成された地中連続壁と、
該地中連続壁の内側に構築され、液体が貯蔵可能なタンク本体と、
前記地中連続壁の外周面に沿って設置された側部ヒータと、を備えることを特徴とする地下タンク。 An underground continuous wall constructed in the ground and formed into a cylindrical shape,
A tank body built inside the underground continuous wall and capable of storing liquid;
And a side heater installed along the outer peripheral surface of the underground continuous wall. 前記側部ヒータは、前記地中連続壁の外周面に沿って複数設置されていることを特徴とする請求項１に記載の地下タンク。   The underground tank according to claim 1, wherein a plurality of the side heaters are installed along an outer peripheral surface of the underground continuous wall. 地盤中に構築され、筒状に形成された地中連続壁と、該地中連続壁の内側に構築され、液体が貯蔵可能なタンク本体と、前記地中連続壁の外周面に沿って設置された側部ヒータと、を備える地下タンクの施工方法であって、
前記地盤中に、前記地中連続壁及び前記側部ヒータが設置される略環状の穴部を一体として掘削する削孔工程と、
前記穴部の内周側に前記地中連続壁を構築する地中連続壁構築工程と、
前記穴部の外周側に前記側部ヒータを設置する側部ヒータ設置工程と、
前記地中連続壁の内側にタンク本体を構築するタンク本体構築工程と、を備えること特徴とする地下タンクの施工方法。 An underground continuous wall constructed in the ground and formed into a cylindrical shape, a tank body built inside the underground continuous wall and capable of storing liquid, and installed along the outer peripheral surface of the underground continuous wall An underground tank construction method comprising:
In the ground, a drilling step of excavating a substantially annular hole portion where the underground continuous wall and the side heater are installed, and
An underground continuous wall construction step of constructing the underground continuous wall on the inner peripheral side of the hole,
A side heater installation step of installing the side heater on the outer peripheral side of the hole;
An underground tank construction method comprising: a tank body construction step of constructing a tank body inside the underground continuous wall.
JP2017153004A 2017-08-08 2017-08-08 Underground tank and construction method of underground tank Pending JP2019031820A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116379333A (en) * 2023-02-28 2023-07-04 山东京博装备制造安装有限公司 Ultralow-temperature earthing tank and preparation process thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116379333A (en) * 2023-02-28 2023-07-04 山东京博装备制造安装有限公司 Ultralow-temperature earthing tank and preparation process thereof
CN116379333B (en) * 2023-02-28 2023-12-22 山东京博装备制造安装有限公司 Ultralow-temperature earthing tank and preparation process thereof

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