CN-121994106-A - LNG transport ship cargo hold three-face corner area reference cushion block thickness measurement method

CN121994106ACN 121994106 ACN121994106 ACN 121994106ACN-121994106-A

Abstract

The method for installing the reference cushion blocks of the triangular area of the LNG transport ship comprises the steps of adopting a triangular model and a height template, after the installation of the planar reference cushion blocks of the planar area is completed in a cabin, extending the height of the planar reference cushion blocks of the planar area to the triangular area by utilizing the height template, adjusting measuring bolts preset on the triangular model, namely screwing out the measuring bolts prefabricated on the triangular model to enable the measuring bolts to be attached to the triangular area in the cabin, constructing reference surfaces of the triangular area in the cabin one by one, then taking out the triangular model to measure the screwing-out lengths of the bolts corresponding to the points of the triangular area, and finally installing the triangular reference cushion blocks of the points of the triangular area according to the corresponding thicknesses. The invention can cope with the adverse effect caused by the deformation of the inner shell, so that the installation of the three-face angle reference pad is successful at one time, and the construction efficiency is improved.

Inventors

QIAN XUEWEI
ZHANG HE
GENG LIPENG
WANG ZHANCHENG
BI LILI
SUN XIAOLEI
TONG ZIYUAN
LV JINGANG
ZHANG XINGAN
ZHANG XIAOMAN
SHENG YUZHI
MAO HAIBO
GUAN JIAN
FANG MING
FENG WEI
HE YULIANG
QU ZHI
HUANG RONGGANG
QIN MING

Assignees

大连船舶重工集团有限公司

Dates

Publication Date: 20260508
Application Date: 20251215

Claims (6)

1. The method is characterized in that a three-face angle model with the same size as the three-face angle area to be measured is manufactured according to a drawing, the whole three-face angle model is of a frame structure, three faces are simulated in a frame form, three faces of frames intersect to form angles, and measuring bolts are arranged on a frame bottom cross beam of each face; The measuring device also needs to use a height template, wherein the height template is provided with an upper transverse ruler and a lower transverse ruler which are horizontally arranged, the upper transverse ruler is connected with the lower transverse ruler through a connecting plate which is vertically arranged, the top end of the connecting plate is connected with the tail end of the upper transverse ruler, and the bottom end of the connecting plate is connected with the open end of the lower transverse ruler; The plane area of each surface of the cargo hold is fixed with a plane reference cushion block, three surfaces of a triangular area are required to be fixed with the triangular reference cushion blocks, and the three surfaces of the triangular area are measured by using a height template, namely, a triangular model is plugged into the triangular area to be measured, and the height template is used for measuring the levelness of any surface of the triangular area; The method comprises the steps of firstly, enabling an upper transverse ruler of a height template to be arranged on a plane reference cushion block of a first surface, enabling a lower transverse ruler to be arranged on a triangular model frame corresponding to the first surface, enabling a connecting plate to be clung to the side face of the triangular model frame, firstly, enabling the upper transverse ruler to be clung to the plane reference cushion block, enabling the upper transverse ruler to be always clung to the plane reference cushion block in the measuring process, then, screwing out a measuring bolt on the plane frame, enabling the outer surface of the plane frame to be clung to a lower transverse ruler, enabling the outer surface of the frame to be clung to the lower transverse ruler, and then repeating the specific measuring steps to measure other two surfaces; When three frame surfaces on the triangular model are measured, taking out the triangular model, measuring the unscrewing length of the measuring bolt on each frame surface by using a micrometer, wherein the unscrewing length of the measuring bolt is the thickness of the triangular reference cushion blocks, and installing the triangular reference cushion blocks with determined thickness to the corresponding positions one by one.
2. The method for measuring the thickness of the reference cushion block in the triangular area of the cargo hold of the LNG carrier according to claim 1, wherein the thickness of the frame on each side of the triangular model is the same as the height of the insulating plate to be installed in the next process.
3. The method for measuring the thickness of the reference cushion block in the triangular area of the cargo hold of the LNG carrier according to claim 1, wherein the upper transverse ruler and the lower transverse ruler form an angle of 90 degrees with the connecting plate.
4. The method for measuring the thickness of the plane reference cushion block of the cargo hold of the LNG carrier according to claim 1, wherein the cargo hold plane is divided into a plane area and a plane area, the plane reference cushion block on the plane area is scanned by a laser scanner, the levelness of the plane area of the bulkhead is calculated by software, the position and the thickness of the plane reference cushion block are determined, and then the plane reference cushion block is adhered to the corresponding position of the plane area of the bulkhead.
5. The method for measuring the thickness of the triangular area reference cushion blocks of the cargo hold of the LNG carrier according to claim 1, wherein the triangular area reference cushion blocks with the determined thickness are installed one by one at the positions where the measuring bolts are located when measuring.
6. A method for measuring the thickness of a reference spacer block in the triangular region of a cargo compartment of an LNG carrier according to claim 1,2 or 3, wherein the length of the connection plate is the same as the height of the frame on each side of the triangular model, and the same as the height of the insulating plate to be installed in the next step.

Description

LNG transport ship cargo hold three-face corner area reference cushion block thickness measurement method Technical Field The invention belongs to the field of marine ship construction and design, and particularly relates to a method for measuring thickness of a reference cushion block in a triangular area of a cargo tank of an LNG transport ship. Background In the construction of the MARK III type LNG ship cargo containment system, the insulating plate is an important component part for liquid cargo heat preservation, is also a main supporting structure of a main layer of screen wall and a secondary layer of screen wall, is one of key parts of the LNG cargo containment system, and is mainly divided into a plane plate, a boundary plate, a corner area plate and a trihedron. The insulating board is adhered to the hull inner shell through resin, and the difference between adjacent insulating board layers is required to be not more than 1mm (by virtue of a plane reference cushion block) during installation. In the LNG ship construction process, as the cargo hold surface is deformed after the ship body is carried, uneven conditions such as layer difference, seam lifting and the like occur, the condition of the surface of the ship body is considered, and meanwhile, the requirement of flatness is also considered, and a reference surface is required to be established to level the insulating plate. The plane area can be directly generated by using laser leveling instrument measurement and GTT-LISS software, and then a plane reference cushion block is arranged at each measurement position to level the plane area. However, the angle area belongs to a special area, a reference plane cannot be directly generated by using a laser leveling instrument to measure and GTT-LISS software, the reference plane is required to be constructed manually by using tools such as a 3m ruler, a 90 DEG angle template and a 135 DEG angle template, and then the thickness of the lower part corresponding to the reference plane constructed by using various tools is measured by using a feeler gauge so as to determine the thickness of a plane reference cushion block of the angle area. In the measurement of the reference surfaces of the dihedral corner regions and the triangular corner regions, the difficulty of measuring the thickness below the reference surfaces of the triangular corner regions is greatest, and the local reference surfaces of the triangular corner regions are mutually influenced, wherein the local reference surfaces of any one surface are consistent with the plane reference surfaces, so that the local reference surfaces of any one surface in the triangular corner regions are constructed to influence the local reference surfaces of the other two surfaces. The traditional method for constructing the triangular area reference surface comprises the steps of manually utilizing tools such as a 3m rule tool, a 90 DEG angle template and a 135 DEG angle template, extending adjacent lines on the planar reference surface to the triangular area by utilizing the 3m rule tool, and then utilizing the 90 DEG angle template and the 135 DEG angle template to extend adjacent two-sided angle reference surfaces pairwise to construct a local triangular area reference surface, wherein the traditional method has the defects of complex flow process, one-by-one construction and separate measurement of the thickness of the planar reference cushion block below each triangular area reference surface, and if the thickness of the main planar reference cushion block is inaccurate due to inaccurate measurement, dim light or noisy field on an inner shell plate by manually pressing the tools, the structure of the reference surface of the whole triangular area is directly influenced, the steps are needed to be reworked by utilizing various tools, on one hand, the on-site production efficiency is directly influenced, the improvement of the production efficiency and the requirement of lean production are not facilitated, even other multiple procedures such as installation of an insulating plate are directly influenced, on the other hand, the labor cost is correspondingly increased, the plane reference cushion block uncovered by reworking is difficult to reuse, the requirements of enterprises on reducing the labor cost and the material cost are contradicted, and the promotion of the enterprise cost engineering is not facilitated. Therefore, a method for constructing the reference surface of the triangular area of the MARK III type cargo containment system of the LNG ship is needed. Disclosure of Invention In order to solve the problems, the invention provides a method for measuring the thickness of a triangular reference cushion block of a cargo hold of an LNG transport ship, which aims to achieve the purpose of conveniently and quickly measuring the thickness of the triangular reference cushion block of the triangular region of the cargo hold, and adopts the followi