CN-122009398-A - LNG ship surrounding well structure and construction method thereof

CN122009398ACN 122009398 ACN122009398 ACN 122009398ACN-122009398-A

Abstract

The application discloses an LNG ship surrounding well structure and a construction method thereof, wherein the surrounding well structure is arranged between a dome deck and an inner deck and comprises two longitudinal plates and two transverse plates, the longitudinal bones of the dome deck and the longitudinal bones of the inner deck are cut off at the installation positions of the transverse plates, the upper ends of the two longitudinal plates are welded with the dome deck, the lower ends of the two longitudinal plates are welded with the inner deck, the left side and the right side of the two longitudinal plates are welded with the cut-off positions of the longitudinal bones, the two transverse plates are welded with the left side end and the right side end of the two longitudinal plates respectively, the upper ends of the two transverse plates are welded with the dome deck, and the lower ends of the two transverse plates are welded with the inner deck. The application maximizes the space in the surrounding well of the surrounding well structure of the LNG ship, reduces the number of welding seams, enhances the tightness of the structure, reduces the assembly difficulty and saves the construction time of the ship.

Inventors

QIN XIAOYAN
HE WEIZHONG
ZHANG WEI
XU KAI
LIU LIN
WENG LINGLING
HAN RONG
WANG KEQIANG

Assignees

沪东中华造船(集团)有限公司

Dates

Publication Date: 20260512
Application Date: 20260326

Claims (6)

1. The utility model provides a LNG ship surrounding well structure, LNG ship surrounding well structure is used for placing the ventilation box, LNG ship surrounding well structure sets up between dome deck and interior deck, and the lower surface of dome deck and the upper surface of interior deck have the longitudinal rib along vertically all welded, and the longitudinal rib of dome deck and the longitudinal rib of interior deck set up relatively, a serial communication port, LNG ship surrounding well structure includes two longitudinal plates that set up along the longitudinal direction and two transverse plates that set up along the transverse direction, and longitudinal plate and transverse plate are continuous whole board, and longitudinal plate and transverse plate all perpendicular to dome deck, and the longitudinal rib of dome deck and the longitudinal rib of interior deck all cut in the installation department of transverse plate, and the upper end of two longitudinal plates all with dome deck welded connection, the lower extreme of two longitudinal plates all with interior deck welded connection, the left side end and the right side end welded connection of two longitudinal plates respectively, the upper end of two transverse plates all with dome deck welded connection, the lower extreme of two transverse plates all welded connection with the interior deck.
2. The LNG ship well structure of claim 1, wherein the longitudinal plates are welded to the cut-off portions of the longitudinal bones by deep penetration welding.
3. The LNG ship well structure of claim 1, wherein a toggle plate is further provided between the longitudinal frame and the longitudinal plate, one side of the toggle plate being welded to the longitudinal frame, and the other side of the toggle plate being welded to the side of the longitudinal plate.
4. A LNG ship well-surrounding structure according to claim 3, characterized in that the toggle plate is a triangular toggle plate, the two straight sides of the toggle plate being welded to the longitudinal bones, the side edges of the longitudinal plates, respectively.
5. A method for constructing an LNG ship's hold, characterized in that the LNG ship's hold is an LNG ship's hold structure according to any one of claims 1-4, comprising the steps of: Cutting off longitudinal bones on the lower surface of a longitudinal dome deck and longitudinal bones on the upper surface of an inner deck at the installation position of the LNG ship surrounding well structure, placing a longitudinal plate between the cutting-off positions of the longitudinal bones, welding the upper ends of the longitudinal plates and the dome deck, the lower ends of the longitudinal plates and the inner deck, welding the cutting-off ends of the longitudinal bones and the side edges of the longitudinal plates, welding the side edges of the transverse plates and the side edges of the longitudinal plates, welding the upper ends of the transverse plates and the dome deck, and welding the lower ends of the two transverse plates and the inner deck.
6. The method of constructing an LNG ship around well as defined in claim 5, further comprising providing a toggle plate between the longitudinal frame and the longitudinal plate, wherein the toggle plate is a triangular toggle plate, and two straight edges of the toggle plate are welded to the longitudinal frame and the side edges of the longitudinal plate, respectively.

Description

LNG ship surrounding well structure and construction method thereof Technical Field The invention relates to the technical field of ship construction, in particular to an LNG ship surrounding well structure and a construction method thereof. Background On a thin film Liquefied Natural Gas (LNG) carrier, an air permeable box is used as a key safety component of a MARK III type or NO.96 type liquid cargo containment system and plays important roles of ventilation, pressure release, heat insulation protection and the like of a liquid cargo tank. In the ship loading and unloading operation and sailing process, the ventilation box is used for continuously monitoring and adjusting the pressure in the cabin, so that the safety and stability of the liquefied natural gas in the whole process of storage and transportation are ensured. Typically, the gas permeation tank of the LNG ship is disposed at a specific position between the dome deck and the inner deck, and the boil-off gas generated in the tank is transferred to a reliquefaction device or a gas engine or the like by being connected to a boil-off gas (BOG) processing system. In order to achieve the normal operation of the tank and to ensure the tightness of the tank, the hull structure of the installation area needs to be designed in the form of a well with good tightness, and at the same time, the strength and continuity of the hull structure must be ensured, and the tank is convenient to install and maintain. In the ship construction stage, strict helium leakage detection is required for welding seams around the ventilation box surrounding well, such as connecting welding seams between a dome deck and an inner deck, so as to verify that the welding quality meets the air tightness requirement of the liquid cargo surrounding system. The existing film type LNG ship airtight surrounding well structure design is generally that a closed cube surrounding well structure is built around the installation position of a ventilation box in a mode of adding an additional plate on the basis of an original ship body structure. As shown in fig. 1, the existing LNG ship surrounding well structure includes a spacer plate 4 disposed between a longitudinal rib 3 on the lower surface of a dome deck 1 and a longitudinal rib 3 on the upper surface of an inner deck 2, a transverse plate 5 welded with the spacer plate, notches disposed at four corners of the transverse plate 5 for placing the longitudinal rib 3, and a patch 6 welded at the notches and completely fitting with the longitudinal rib 3, wherein the patch 6 is welded with the transverse plate 5, and welds are formed between the upper and lower ends of the spacer plate 4 and the longitudinal rib 3, between the longitudinal rib 3 and the deck, and between the patch 6 and the transverse plate 5. The existing LNG ship surrounding well structure has the defects that the original ship body structure is not adjusted, so that a large number of splicing welding seams are required to be arranged around the surrounding well, the welding workload is increased, the integral strength and the sealing reliability of the structure can be influenced due to the fact that the welding seams are dense, and potential risks are brought to subsequent helium tests and long-term operation. Therefore, it is necessary to optimize the existing manhole structure design to reduce the number of welds, improve the structural tightness and strength, and simplify the construction process. Disclosure of Invention Aiming at the defects in the prior art, the application provides an LNG ship surrounding well structure and a construction method thereof, which are used for solving the technical problems of large number of welding seams, large welding workload, low overall strength and sealing performance and the like of an LNG ship surrounding well for placing a ventilation box in the prior art. In order to achieve the aim of the invention, the technical scheme provided by the invention is as follows: The utility model provides a LNG ship well structure, LNG ship well structure is used for placing the ventilative case, LNG ship well structure sets up between dome deck and interior deck, the lower surface of dome deck and the upper surface of interior deck have the longitudinal rib with all welded along vertically, the longitudinal rib of dome deck and the longitudinal rib of interior deck set up relatively, a serial communication port, LNG ship well structure includes two longitudinal plates that set up along longitudinal direction and two transverse plates that set up along the transverse direction, longitudinal plate and transverse plate are continuous whole board, longitudinal plate and transverse plate all perpendicular to dome deck, the longitudinal rib of dome deck and the longitudinal rib of interior deck all cut at the installation department of transverse plate, the upper end of two longitudinal plates all with dome deck welded connection, the lower extre