KR20180006037A - Bottom Vapour Barrier - Google Patents

Bottom Vapour Barrier Download PDF

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KR20180006037A
KR20180006037A KR1020160086596A KR20160086596A KR20180006037A KR 20180006037 A KR20180006037 A KR 20180006037A KR 1020160086596 A KR1020160086596 A KR 1020160086596A KR 20160086596 A KR20160086596 A KR 20160086596A KR 20180006037 A KR20180006037 A KR 20180006037A
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South Korea
Prior art keywords
roof
steel plates
lng
tank
vapor barrier
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KR1020160086596A
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Korean (ko)
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KR101878683B1 (en
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이학배
권양중
정창환
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주식회사 한국가스기술공사
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Priority to KR1020160086596A priority Critical patent/KR101878683B1/en
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    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04HBUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
    • E04H7/00Construction or assembling of bulk storage containers employing civil engineering techniques in situ or off the site
    • E04H7/02Containers for fluids or gases; Supports therefor
    • E04H7/18Containers for fluids or gases; Supports therefor mainly of concrete, e.g. reinforced concrete, or other stone-like material
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65DCONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D88/00Large containers
    • B65D88/02Large containers rigid
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17CVESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C3/00Vessels not under pressure
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65DCONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D2313/00Connecting or fastening means
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17CVESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2221/00Handled fluid, in particular type of fluid
    • F17C2221/03Mixtures
    • F17C2221/032Hydrocarbons
    • F17C2221/033Methane, e.g. natural gas, CNG, LNG, GNL, GNC, PLNG
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17CVESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2223/00Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/01Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
    • F17C2223/0146Two-phase
    • F17C2223/0153Liquefied gas, e.g. LPG, GPL
    • F17C2223/0161Liquefied gas, e.g. LPG, GPL cryogenic, e.g. LNG, GNL, PLNG

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)

Abstract

The present invention relates to a bottom vapor barrier construction method of a prestressing concrete type tank for a liquefied natural gas (LNG) storage tank, which has a barrier function to prevent boil-off gas in an LNG tank from leaking to the outside and, more specifically, relates to a bottom vapor barrier construction method of a prestressing concrete type tank for an LNG storage tank, which can reduce time of construction.

Description

액화천연가스(LNG) 저장탱크용 외조탱크의 바닥증기 차단막 시공방법{Bottom Vapour Barrier}Technical Field [0001] The present invention relates to a bottom vapor barrier (LNG) storage tank for a liquefied natural gas (LNG) storage tank,

본 발명은 액화천연가스(LNG) 탱크 내부의 증발가스가 외부로 누설되지 않도록 차단막 기능을 하는 액화천연가스(LNG) 저장탱크용 외조탱크의 바닥증기 차단막 시공방법에 관한 것으로써, 특히 공기(工期)를 단축할 수 있도록 한 액화천연가스(LNG) 저장탱크용 외조탱크의 바닥증기 차단막 시공방법에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of constructing a bottom shielding layer of an outer tank for a liquefied natural gas (LNG) storage tank, which functions as a shielding layer so that evaporation gas inside a LNG tank is prevented from leaking to the outside, The present invention also relates to a method for constructing a bottom shielding layer of an outer tank for a liquefied natural gas (LNG) storage tank.

완전 방호식 저장탱크(Full Containment Tank)의 외조탱크(Prestressing Concrete Type)는 액화천연가스(LNG) 누출사고가 발생했을 경우 외부로 내용물이 누출되는 것을 방지하도록 한다.The Full Containment Tank's Prestressing Concrete Type prevents leakage of the contents to the outside when a Liquefied Natural Gas (LNG) leakage accident occurs.

또한 외조탱크 내면에 설치된 증기차단막은 금속판으로서, 증발가스를 바닥, 벽체 및 지붕까지 완전 차단하는 역할을 한다. 외조탱크 지붕부는 내부탱크로 연결되는 관통배관이 설치된다.In addition, the steam shielding film provided on the inner surface of the outer tank is a metal plate, and serves to completely block the evaporation gas from the bottom to the wall and the roof. The outer tank tank roof is provided with a through pipe connected to the inner tank.

도 1을 참조하면, 액화천연가스(LNG) 탱크 건설은 외조탱크의 지반기초(10), 바닥부(20), 벽체부(30) 그리고 지붕부(40) 순서로 진행된다. Referring to FIG. 1, construction of a liquefied natural gas (LNG) tank proceeds in the order of the foundation 10, the bottom 20, the wall 30 and the roof 40 of the outer tank.

벽체부(30) 공사가 진행될 때 외조탱크 내부에서는 기계공사가 병행하여 수행된다. 즉, 지붕 철골 구조물(Roof Steel Structure) 조립을 위한 바닥 지지대 설치, 외조탱크 지붕구조물과 바닥증기 차단막(Bottom Vapour Barrier) 설치를 위한 빗물차단벽 설치 등 기계공사에 필요한 가 시설물(Temporary Structure; 50) 설치가 필요하다.When the wall portion 30 is under construction, mechanical construction is performed in parallel inside the outer tank. In other words, a temporary structure 50 is required for machine construction, such as installation of a floor support for assembling a roof steel structure, installation of a rain tank wall for installing a roof structure of an outer tank and a bottom vapor barrier, Installation is required.

한편, 도 2 및 도 3a를 참조하면, 종래 바닥부 증발가스차단막(5)을 시공하는 방법은 배열순서에 따라 직사각 철판(Rectangular Plate)(1)(2)을 먼저 배치하고, 지붕 철골 구조물(Roof Steel Structure) 지지대와 같은 가 시설물(50)을 벽체부(30)와의 경계부분 콘크리트 바닥부(20)에 앵커등으로 고정설치한후, 중량의 지붕 철골 구조물을 외조탱크 바닥부에서 조립한 후 송풍기(Air Blower;미도시)를 이용하여 외조 탱크 상부까지 인양하여 설치한다.2 and 3A, in the conventional method of constructing the bottom evaporation gas barrier layer 5, the rectangular plates 1 and 2 are arranged in the order of arrangement, and the roof steel structure Roof Steel Structure A facility 50 such as a support is fixed to the concrete part 20 at the boundary part with the wall part 30 by an anchor or the like and then a heavy roof steel structure is assembled at the bottom of the outer tank Use an air blower (not shown) to lift the tank to the top of the tank.

지붕 철골 구조물 및 기계설비들이 설치된 후에는 도 3b에서와 같이, 상기 가 시설물(50)을 제거하고, 제거된 바닥자리면에 환상 철판(Annular Plate;3)을 배치하여 상기 미리 배치된 직사각 철판(Rectangular Plate)(1)(2)들과 용접하여 연결한다.After the roof structure and the mechanical equipment are installed, as shown in FIG. 3B, the installation 50 is removed, and an annular plate 3 is disposed on the removed bottom seat surface, Rectangular Plate) (1) (2) by welding.

여기서 상기 가 시설물(50)은 중량물로서 콘크리트 바닥부(20)에 앵커등으로 고정하여야 하기 때문에, 지붕 철골 구조물(Roof Steel Structure)을 인양하고 가 시설물(50)을 해체한 후 상기 환상 철판(Annular Plate;3)과 직사각 철판(Rectangular Plate)(1)(2)들을 배치하여 상호 용접수행하여야 한다. 이에 따라 공기가 길어지는 문제점이 있다.The roof 50 is to be fixed to the concrete floor 20 by an anchor or the like so that the roof 50 is lifted and the roof 50 is dismantled. Plate (3) and Rectangular Plate (1) (2) should be placed and welded to each other. There is a problem in that the air is lengthened.

한국 등록특허공보 제10-0013200호 "액화가스저장탱크"(등록일자 : 1982.11.19)Korean Registered Patent No. 10-0013200 entitled "Liquefied gas storage tank" (registered on November 19, 1982)

본 발명은 상기와 같은 문제점, 즉 건설공사 주공정에 포함되는 사각철판의 용접작업을 지붕 철골 구조물(Roof Steel Structure) 인양 전에 수행할 수 있는 방안으로 바닥증기차단막(Bottom Vapour Barrier)의 배열구조개선(Arrangement Structure Improvement)방법을 발명하여 건설공기 영향을 최소화하고 가 시설물(Temporary Structure) 설치와도 간섭이 없이 건설공사를 진행하여 건설공사기간을 단축할 수 있도록 한 액화천연가스(LNG) 저장탱크용 외조탱크의 바닥증기 차단막 시공방법을 제공하는데 그 목적이 있다.SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, that is, to improve the arrangement structure of the bottom vapor barrier (Bottom Vapor Barrier) in order to perform the welding work of the square steel plate included in the main process of the construction work before lifting the roof steel structure (LNG) storage tanks that can minimize the impact of construction air by inventing the Arrangement Structure Improvement method and shorten the construction period by constructing without interfering with the installation of temporary structures. And an object of the present invention is to provide a method of constructing a bottom steam barrier of an outer tank.

상기 목적을 달성하는 본 발명은 바닥부, 벽체부 그리고 지붕부로 이루어지는 액화천연가스(LNG) 저장탱크용 외조탱크의 바닥부에 환상철판과 사각철판들을 상호 용접하여서 바닥증기 차단막을 시공하는 방법에 있어서,According to an aspect of the present invention, there is provided a method for constructing a floor vapor barrier membrane by welding an annular steel plate and a rectangular steel plate to a bottom portion of an outer tanks for a liquefied natural gas (LNG) storage tank comprising a bottom portion, a wall portion and a roof portion ,

a) 상기 바닥부와 벽체부를 콘크리트로 형성하는 단계와;a) forming the bottom portion and the wall portion from concrete;

b) 상기 벽체부와 인접하는 상기 바닥부에 지붕 구조물을 포함하는 상기 지붕부 조립을 위한 가시설물을 고정설치하는 단계와;b) fixing the roof part assembly to the floor adjacent to the wall part;

c) 상기 b) 단계를 진행하면서 상기 바닥부에 상기 사각철판들을 인접하여 용접하고, 상기 사각철판들의 둘레를 따라 제1환상철판들을 용접하여 연결하는 단계와;c) welding the rectangular steel plates adjacent to the bottom portion adjacent to each other while welding is performed, and welding the first annular steel plates along the periphery of the rectangular steel plates;

d) 상기 지붕 구조물을 조립한 후 상기 가시설물을 철거하는 단계와;d) demolishing the roof structure after the roof structure is assembled;

e) 상기 가시설물이 철거된 상기 바닥부에 제2환상철판들을 배치하여 상기 제1환상철판들과 용접하여 연결하는 단계;를 포함하는 것을 특징으로 한다.e) disposing second annular steel plates on the bottom of the facility where the facility is demolished and welding and connecting the first annular steel plates.

본 발명 시공방법은 지붕 구조물을 포함하는 지붕부(40) 조립을 위한 가시설물(50)을 고정설치하고 가시설물(50)을 이용하여 지붕부(40)의 조립을 진행하면서, 바닥부(20)에 사각철판(1)(2)들을 인접하여 용접하고 사각철판(1)(2)들의 둘레를 따라 제1환상철판(3a)들을 용접하여 연결하는 작업을 함께 진행할 수 있도록 함으로써, 공사의 연속성을 가능하게 하여 공기를 단축할 수 있도록 한다. The method for constructing the roof part 40 of the present invention includes the steps of fixing the roof part 40 for assembling the roof part 40 and fixing the roof part 40 by using the roof part 40, 2 and welded and welded the first annular steel plates 3a along the peripheries of the square steel plates 1 and 2 so that the continuity of the construction So that the air can be shortened.

도 1은 액화천연가스(LNG) 저장탱크용 외조탱크를 나타낸 개략도,
도 2는 종래 바닥증기 차단막을 나타낸 요부 평면도,
도 3a 및 도 3b는 종래 바닥증기 차단막 시공법을 설명하는 개략도,
도 4는 본 발명 실시예에 따른 바닥증기 차단막을 나타낸 요부 평면도,
도 5a 및 도 5b는 본 발명 실시예에 따른 바닥증기 차단막 시공법을 설명하는 개략도이다.
BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a schematic view of an outer tank for a liquefied natural gas (LNG) storage tank,
FIG. 2 is a plan view of a bottom part showing a conventional floor vapor barrier,
FIGS. 3A and 3B are schematic views for explaining a conventional floor vapor barrier construction method;
FIG. 4 is a plan view showing a bottom part of a floor vapor barrier membrane according to an embodiment of the present invention,
FIGS. 5A and 5B are schematic views for explaining a floor vapor barrier film construction method according to an embodiment of the present invention.

본 발명 실시예의 시공방법은 액화천연가스(LNG) 저장탱크용 외조탱크의 바닥부에 바닥증기 차단막의 공기를 단축할 수 있게 한다.The construction method of the embodiment of the present invention makes it possible to shorten the air of the floor vapor barrier film to the bottom of the outer tank for the liquefied natural gas (LNG) storage tank.

외조탱크(Prestressing Concrete Type)는 액화천연가스(LNG) 누출사고가 발생했을 경우 외부로 내용물이 누출되는 것을 방지하도록 한다.Prestressing Concrete Type prevents leakage of the contents to the outside in the event of LNG leakage.

상기 외조탱크는 도 1에서와 같이, 바닥부(20), 벽체부(30) 그리고 지붕부(4)로 이루어지며, 액화천연가스(LNG) 저장탱크용 외조탱크의 바닥부(20)에는 도 4에서와 같이 환상철판(3a)(3b)과 사각철판(1)(2)들이 상호 용접되어서 바닥증기 차단막(5)을 형성한다.1, the outer tank is composed of a bottom portion 20, a wall portion 30 and a roof portion 4, and the bottom portion 20 of the outer tank for a liquefied natural gas (LNG) The annular steel plates 3a and 3b and the rectangular steel plates 1 and 2 are welded to each other to form a bottom vapor barrier film 5 as shown in FIG.

상기 외조탱크를 시공하는 공정은, 상기 바닥부(20)와 벽체부(30)를 콘크리트로 형성하는 단계와; 도 5a에서와 같이 상기 벽체부(30)와 인접하는 상기 바닥부(20)에 지붕 구조물을 포함하는 상기 지붕부(40) 조립을 위한 가시설물(50)을 고정설치하고 상기 지붕부(40)를 조립하는 단계와; 상기 가시설물(50)을 이용하여 지붕부(40)의 조립을 진행하면서 상기 바닥부(20)에 상기 사각철판(1)(2)들을 인접하여 용접하고, 상기 사각철판(1)(2)들의 둘레를 따라 제1환상철판(3a)들을 용접하여 연결하는 단계와; 상기 지붕 구조물을 조립한 후 도 5b에서와 같이 상기 가시설물(50)을 철거하는 단계와; 상기 가시설물(50)이 철거된 상기 바닥부(20)에 제2환상철판(3b)들을 배치하여 상기 제1환상철판(3a)들과 용접하여 연결하는 단계;를 통하여 시공된다.The step of constructing the outer tanks may include forming the bottom portion 20 and the wall portion 30 from concrete; The roof part 40 is fixedly installed on the floor part 20 adjoining the wall part 30 as shown in FIG. 5A to assemble the roof part 40 for assembling the roof part 40, ; ≪ / RTI > The rectangular steel plates 1 and 2 are welded adjacently to the bottom part 20 while the roof part 40 is assembled using the facility 50 and the rectangular steel plates 1 and 2 are welded, Welding the first annular steel plates 3a along the circumference of the first annular steel plates 3a; After the roof structure is assembled, removing the installation 50 as shown in FIG. 5B; The second annular steel plates 3b are disposed on the bottom part 20 with the facility 50 removed and welded to the first annular steel plates 3a.

상기와 같은 본 발명 실시예의 시공방법에 있어서, 환상철판을 제1환상철판(3a)과 제2환상철판(3b)으로 분리하여 건설 시공성을 최적화하였다.In the construction method of the present invention as described above, the annular steel plate is divided into the first annular steel plate 3a and the second annular steel plate 3b to optimize construction workability.

제1환상철판(3a)은 사각철판(1)(2)과의 현장 용접 작업이 지붕 철골 구조물(Roof Steel Structure)의 인양전에 수행되며, 제2환상철판(3b)은 지붕 철골 구조물(Roof Steel Structure)과의 간섭 검토, 우수 방지댐 설치 위치 검토 및 빗물배수구 위치 등을 설계 개념과 일치하도록 소정폭 예컨대, 2182 mm 크기로 배열하였다.The first annular steel plate 3a is subjected to the field welding work with the rectangular steel plates 1 and 2 before the lifting of the roof steel structure and the second annular steel plate 3b is carried out before the roof steel structure Roof Steel Structure Structure, the review of the installation location of the rain prevention dam, and the location of the rainwater drainage are arranged to have a predetermined width of, for example, 2182 mm in conformity with the design concept.

상기한 바와 같은 본 발명은 지붕 구조물을 포함하는 상기 지붕부(40) 조립을 위한 가시설물(50)을 고정설치하고 가시설물(50)을 이용하여 지붕부(40)의 조립을 진행하면서, 상기 바닥부(20)에 상기 사각철판(1)(2)들을 인접하여 용접하고 상기 사각철판(1)(2)들의 둘레를 따라 제1환상철판(3a)들을 용접하여 연결하는 작업을 함께 진행할 수 있도록 함으로써, 공사의 연속성을 가능하게 하여 공기를 단축할 수 있도록 한다. As described above, according to the present invention, while the roofing part 40 for assembling the roofing part 40 including the roofing structure is fixedly installed and the roofing part 40 is assembled using the roofing material 50, Welding the square iron plates 1 and 2 to the bottom 20 and welding the first annular iron plates 3a along the periphery of the square steel plates 1 and 2 So that continuity of the construction can be made and air can be shortened.

1,2...사각철판 3a,3b...제1,2환상철판
5...바닥증기 차단막
1,2 ... Square steel plates 3a, 3b ... First and second annular steel plates
5 ... bottom steam barrier

Claims (1)

바닥부, 벽체부 그리고 지붕부로 이루어지는 액화천연가스(LNG) 저장탱크용 외조탱크의 바닥부에 환상철판과 사각철판들을 상호 용접하여서 바닥증기 차단막을 시공하는 방법에 있어서,
a) 상기 바닥부(20)와 벽체부(30)를 콘크리트로 형성하는 단계와;
b) 상기 벽체부(30)와 인접하는 상기 바닥부(20)에 지붕 구조물을 포함하는 상기 지붕부(40) 조립을 위한 가시설물(50)을 고정설치하는 단계와;
c) 상기 b) 단계를 진행하면서 상기 바닥부(20)에 상기 사각철판(1)(2)들을 인접하여 용접하고, 상기 사각철판(1)(2)들의 둘레를 따라 제1환상철판(3a)들을 용접하여 연결하는 단계와;
d) 상기 지붕 구조물을 조립한 후 상기 가시설물(50)을 철거하는 단계와;
e) 상기 가시설물(50)이 철거된 상기 바닥부(20)에 제2환상철판(3b)들을 배치하여 상기 제1환상철판(3a)들과 용접하여 연결하는 단계;를 포함하는 것을 특징으로 하는 액화천연가스(LNG) 저장탱크용 외조탱크의 바닥증기 차단막 시공방법.
A method for constructing a floor vapor barrier membrane by welding an annular steel plate and a rectangular steel plate to a bottom portion of an outer tank for a liquefied natural gas (LNG) storage tank comprising a bottom portion, a wall portion and a roof portion,
a) forming the bottom part (20) and the wall part (30) into concrete;
b) fixing the installation (50) for assembling the roof part (40) including the roof structure to the bottom part (20) adjacent to the wall part (30);
c) The rectangular steel plates 1 and 2 are welded adjacent to the bottom part 20 while the step b) is performed, and the first annular steel plates 1 a and 2 are welded along the periphery of the square steel plates 1 and 2. Welded to each other;
d) demolishing the installation (50) after assembling the roof structure;
e) arranging the second annular steel plates 3b on the bottom part 20 with the facility 50 removed and welding and connecting the first annular steel plates 3a to each other; A method for constructing a bottom vapor barrier of an outer tank for a liquefied natural gas (LNG) storage tank.
KR1020160086596A 2016-07-08 2016-07-08 Bottom Vapour Barrier KR101878683B1 (en)

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Publication number Priority date Publication date Assignee Title
CN110630074A (en) * 2019-08-30 2019-12-31 上海市基础工程集团有限公司 Prefabricated assembled soil collection box for shield tunnel engineering construction

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KR20240054019A (en) 2022-10-18 2024-04-25 (주)포스코이앤씨 Method for constructing base of lng tank

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JP2002179185A (en) * 2000-12-15 2002-06-26 Nippon Steel Corp Steel tank comprising longitudinal panel, and constructing method thereof
KR20150037970A (en) * 2012-11-06 2015-04-08 가부시키가이샤 아이에이치아이 Method for constructing cylindrical tank

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Publication number Priority date Publication date Assignee Title
JP2002179185A (en) * 2000-12-15 2002-06-26 Nippon Steel Corp Steel tank comprising longitudinal panel, and constructing method thereof
KR20150037970A (en) * 2012-11-06 2015-04-08 가부시키가이샤 아이에이치아이 Method for constructing cylindrical tank

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110630074A (en) * 2019-08-30 2019-12-31 上海市基础工程集团有限公司 Prefabricated assembled soil collection box for shield tunnel engineering construction

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