Mounting method for SUPER + secondary layer connecting piece of LNG ship

Abstract

The invention discloses an installation method for SUPER + sub-layer connecting pieces of an LNG ship, and the method specifically comprises the following steps: S1, installing the sub-layer connecting pieces between adjacent sub-layer insulation boxes, and connecting the adjacent sub-layer insulation boxes; s2, the assembled door-shaped wedge block body structure is installed on the secondary-layer connecting piece, and a hole is formed in the middle of the door-shaped wedge block body to be aligned with the middle of the secondary-layer connecting piece; s3, an auxiliary mounting device is mounted in a hole in the middle of the door-shaped wedge block body structure and is fixedly connected with a connecting rod in the secondary-layer connecting piece in a threaded mode; and S4, the door-shaped wedge block body structure is moved downwards by screwing the auxiliary mounting device, and mounting of the door-shaped wedge block body structure is completed. Through arrangement of the auxiliary device, screwing of the adjusting bolt is prevented from being affected by the elastic force of the spring, and installation of the adjusting bolt is reduced.

Description

Technical Field

[0001] This invention belongs to the field of shipbuilding technology, and in particular relates to an installation method for the SUPER+ secondary connecting component of an LNG ship. Background Technology

[0002] The No. 96 Super+ membrane containment system for LNG carriers is an upgrade from the original L03+, particularly in the secondary and primary insulation layers. The connectors for the secondary insulation layer underwent significant changes in their final form during the secondary insulation integrity stage. Previously, the system used portal wedges, an upper mounting plate, and adjusting bolts, with height adjustments achieved using resin or thin wood sheets to meet installation accuracy requirements. Now, the structure is replaced with a special type of portal wedge, gasket, spring, upper mounting plate, adjusting bolts, and anti-rotation gasket. This structure reduces the height of the original portal wedges and enlarges the holes for the adjusting bolts to accommodate springs. The upper mounting plate is then connected to the lower mounting plate, already installed in the previous stage, using adjusting bolts. The height of this structure is controlled by compressing the springs, achieving the required installation height accuracy.

[0003] However, during construction, it was discovered that the two springs under the upper mounting plate were designed to withstand a pressure of 5 tons. If the portal wedge components were pre-assembled and directly screwed into the adjusting bolts for installation, excessive tension between the adjusting bolts and the lower mounting plate would cause frequent stripping of the threaded connections. This resulted in damage to the threads of the lower mounting plate and the adjusting bolts, necessitating the replacement of most of the connecting components. This process resulted in a significant waste of materials and manpower. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide an installation method for the SUPER+ secondary connector of an LNG ship. This invention avoids the adjustment bolt being affected by the spring force when screwing in by the auxiliary device, thus reducing the installation cost of the adjustment bolt.

[0005] To achieve the above-mentioned objectives, the technical solution provided by this invention patent is as follows: An installation method for the SUPER+ secondary connector on an LNG carrier, the method specifically includes the following steps: S1, Install the secondary layer connector between adjacent secondary layer insulation boxes to connect the adjacent secondary layer insulation boxes; S2, Install the assembled portal wedge block structure on the secondary connector and align the opening in the middle of the portal wedge block with the middle of the secondary connector; S3, install the auxiliary installation device into the opening in the middle of the portal wedge block structure, and thread it to the connecting rod in the secondary connector; S4. The portal wedge block structure is moved downward by the screwing auxiliary installation device to complete the installation of the portal wedge block structure.

[0006] Furthermore, the secondary connector includes a lower mounting plate, a spring washer, a nut, a locking plate, and a connecting rod. The connecting rod passes through the middle of the lower mounting plate, and the spring washer, nut, and locking plate are sequentially installed on the connecting rod at the upper end of the lower mounting plate.

[0007] Furthermore, the portal wedge block structure includes a portal wedge block, a washer, a spring, an upper mounting plate, an anti-rotation washer, and an adjusting bolt. A washer is provided inside the portal wedge block, a spring is installed on the upper part of the washer, an upper mounting plate is installed on the upper end of the spring, and adjusting bolts are installed on both sides of the upper mounting plate. The adjusting bolts pass through the portal wedge block, and an anti-rotation washer is provided on the upper side of the portal wedge block. The central opening of the upper mounting plate is aligned with the central opening of the portal wedge block.

[0008] Furthermore, the auxiliary installation device includes a connector, a pressure plate, a first nut, and a second nut. The lower end of the connector passes through the opening in the middle of the portal wedge and is threaded to the upper end of the connecting rod. The pressure plate and the first nut are installed on the upper part of the connector. The pressure plate is connected to the upper mounting plate. The first nut is threaded to the connector. The second nut is screwed onto the upper end of the connector and then fully welded for fixation.

[0009] Furthermore, the connector is cylindrical in shape, with an external thread at the top and a hollow bottom. An internal thread is provided inside the hollow part, and the outer diameter of the connector with the external thread is larger than the outer diameter of the connector with the internal thread.

[0010] Furthermore, the auxiliary installation device for installing the portal wedge block specifically involves: fixing the lower end of the connector to the connecting rod by screwing on the second nut on the connector; then screwing on the first nut to move it downwards; the first nut drives the upper mounting plate downwards through the pressure plate until the layer difference between the surface of the upper mounting plate of the portal wedge block and the adjacent insulation box meets the requirements; stopping the screwing on the first nut; and then screwing the adjusting bolt of the upper mounting plate into the threaded structure of the lower mounting plate to connect the upper mounting plate and the lower mounting plate.

[0011] Furthermore, the layer difference between the upper mounting plate surface of the wedge block and the upper surface of the adjacent insulation box is ±0.5mm.

[0012] Based on the above technical solution, the installation method of the SUPER+ secondary connecting component for LNG ships has achieved the following technical advantages through practical application: 1. The present invention provides an installation method for the SUPER+ secondary connector of an LNG ship. By setting up an auxiliary device, the method avoids the influence of spring force on the screwing in of the adjusting bolt, thereby reducing the installation cost of the adjusting bolt.

[0013] 2. The present invention provides an installation method for the SUPER+ secondary layer connector of an LNG carrier. By setting up an auxiliary device, the method avoids the influence of spring force on the screwing in of the adjusting bolt, reducing the installation of the adjusting bolt and directly reducing the damage to the connecting parts caused by the tensile force generated by the spring force during the direct installation of the adjusting bolt, especially the damage caused by the adjusting bolt getting stuck in the threaded hole of the lower mounting plate or the adjusting bolt breaking in the threaded hole of the lower mounting plate; thus avoiding damage to the portal wedge or even the entire secondary layer connector and the need for replacement. Attached Figure Description

[0014] Figure 1 This is a structural diagram of a connector used in the installation method of the SUPER+ secondary connector for LNG ships.

[0015] Figure 2 This is a diagram of a portal wedge structure used in the installation method of the SUPER+ secondary connector for LNG carriers.

[0016] Figure 3 This is a structural diagram of an auxiliary device used in the installation method of the SUPER+ secondary connecting component for LNG ships.

[0017] Figure 4 This is a schematic diagram of the connector installation process in an installation method for the SUPER+ secondary connector of an LNG ship. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this invention clearer, the following description is provided with reference to the accompanying drawings. The invention is described using specific examples shown. However, it should be understood that these descriptions are merely exemplary. This description is intended not to limit the scope of the invention. Furthermore, in the following description, descriptions of well-known structures and techniques are omitted to avoid unnecessarily obscuring the concept of the invention.

[0019] Example 1, such as Figure 1-4 As shown, an installation method for the SUPER+ secondary connector on an LNG carrier includes the following steps: S1, install the secondary layer connector between adjacent secondary layer insulation boxes 6, and connect the adjacent secondary layer insulation boxes 6; S2, Install the assembled portal wedge block structure on the secondary connector and align the opening in the middle of the portal wedge block with the middle of the secondary connector; S3, install the auxiliary installation device into the opening in the middle of the portal wedge block structure, and thread it to the connecting rod in the secondary connector; S4. The portal wedge block structure is moved downward by the screwing auxiliary installation device to complete the installation of the portal wedge block structure.

[0020] The secondary connector includes a lower mounting plate 1, a spring washer 2, a nut 3, a locking plate 4, and a connecting rod 5. The connecting rod 5 passes through the middle of the lower mounting plate 1, and the spring washer 2, the nut 3, and the locking plate 4 are sequentially installed on the connecting rod 5 at the upper end of the lower mounting plate 1.

[0021] The portal wedge structure includes a portal wedge 71, a washer 72, a spring 73, an upper mounting plate 75, an anti-rotation washer 74, and an adjusting bolt 76. The portal wedge 71 has a washer 72 inside, and a spring 73 is installed on the upper part of the washer 72. The upper mounting plate 75 is installed on the upper end of the spring 73. Adjusting bolts 76 are installed on both sides of the upper mounting plate 75. The adjusting bolts 76 pass through the portal wedge 71. An anti-rotation washer 74 is provided on the upper side of the portal wedge 71. The central opening of the upper mounting plate 75 is aligned with the central opening of the portal wedge 71.

[0022] The auxiliary installation device includes a connector 81, a pressure plate 82, a first nut 83, and a second nut 84. The lower end of the connector 81 passes through a hole in the middle of the portal wedge block 71 and is threaded to the upper end of the connecting rod 5. The pressure plate 82 and the first nut 83 are installed on the upper part of the connector 81. The pressure plate 82 is connected to the upper mounting plate 75. The first nut 83 is threaded to the connector 81. The second nut 84 is screwed onto the upper end of the connector 81 and then fully welded for fixation.

[0023] The connector 81 is cylindrical in shape. The upper part of the connector 81 has external threads, and the lower part of the connector 81 is hollow with internal threads inside. The outer diameter of the connector 81 with external threads is larger than the outer diameter of the connector 81 with internal threads.

[0024] The auxiliary installation device for installing the portal wedge 71 is as follows: the lower end of the connector 81 is threadedly connected and fixed to the connecting rod 5 by screwing the second nut 84 on the connector 81, and then the first nut 83 is screwed down, causing the first nut 83 to move downward. The first nut 83 drives the upper mounting plate 75 downward through the pressure plate 82 until the layer difference between the surface of the upper mounting plate 75 of the portal wedge body and the adjacent insulation box meets the requirements. Then the screwing of the first nut 83 is stopped, and the adjusting bolt 76 of the upper mounting plate 75 is screwed into the threaded structure of the lower mounting plate 1, so that the upper mounting plate 75 is connected to the lower mounting plate 1.

[0025] The layer difference between the upper mounting plate 75 of the wedge block and the upper surface of the adjacent insulation box is ±0.5mm.

[0026] This auxiliary installation device cleverly utilizes the opening in the upper mounting plate 75 of the portal wedge block, which is reserved for the installation of the main layer connector, and the connecting rod 5 of the secondary layer connector for threaded connection. This connection provides tension, allowing the nut in the upper part of the device to advance threadedly and press against the upper mounting plate 75, causing the upper mounting plate 75 to compress the spring 73 downwards to reach the installation height. Finally, the adjusting bolt 76 can be installed without the spring force of the spring 73. This auxiliary installation device effectively reduces the tension and resistance during the installation of the adjusting bolt 76, directly avoiding thread damage under stress, and ensuring a smooth threaded connection between the adjusting bolt 76 and the lower mounting plate 1, unaffected by the spring force of the spring 73. This avoids thread damage to the connector material caused by the direct installation of the adjusting bolt 76, and prevents the need for replacement.

[0027] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it; although the present invention has been described in detail with reference to preferred embodiments, the scope of the invention is not limited to this. Those skilled in the art should understand that modifications can still be made to the specific implementation of the invention or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solution of the present invention, and all such modifications and substitutions should be covered within the scope of the technical solution claimed in the present invention.

Claims

1. An installation method for a SUPER+ secondary layer connector on an LNG carrier, characterized in that, The method specifically includes the following steps: S1, Install the secondary layer connector between adjacent secondary layer insulation boxes to connect the adjacent secondary layer insulation boxes; S2, Install the assembled portal wedge block structure on the secondary connector and align the opening in the middle of the portal wedge block with the middle of the secondary connector; S3, install the auxiliary installation device into the opening in the middle of the portal wedge block structure, and thread it to the connecting rod in the secondary connector; S4. The portal wedge block structure is moved downward by the screwing auxiliary installation device to complete the installation of the portal wedge block structure.

2. The installation method for the SUPER+ secondary layer connector of an LNG ship according to claim 1, characterized in that, The secondary connector includes a lower mounting plate, a spring washer, a nut, a locking plate, and a connecting rod. The connecting rod passes through the middle of the lower mounting plate, and the spring washer, nut, and locking plate are sequentially installed on the connecting rod at the upper end of the lower mounting plate.

3. The installation method for the SUPER+ secondary layer connector of an LNG ship according to claim 2, characterized in that, The portal wedge structure includes a portal wedge, a washer, a spring, an upper mounting plate, an anti-rotation washer, and an adjusting bolt. The portal wedge contains a washer, a spring is mounted on the upper part of the washer, an upper mounting plate is mounted on the upper end of the spring, and adjusting bolts are mounted on both sides of the upper mounting plate. The adjusting bolts pass through the portal wedge, and an anti-rotation washer is provided on the upper side of the portal wedge. The central opening of the upper mounting plate is aligned with the central opening of the portal wedge.

4. The installation method for the SUPER+ secondary layer connector of an LNG ship according to claim 3, characterized in that, The auxiliary installation device includes a connector, a pressure plate, a first nut, and a second nut. The lower end of the connector passes through the opening in the middle of the portal wedge and is threaded to the upper end of the connecting rod. The pressure plate and the first nut are installed on the upper part of the connector. The pressure plate is connected to the upper mounting plate. The first nut is threaded to the connector. The second nut is screwed onto the upper end of the connector and then fully welded for fixation.

5. The installation method for the SUPER+ secondary layer connector of an LNG ship according to claim 4, characterized in that, The connector is cylindrical in shape. The upper part of the connector has external threads, and the lower part of the connector is hollow with internal threads inside. The outer diameter of the connector with external threads is larger than the outer diameter of the connector with internal threads.

6. The installation method for the SUPER+ secondary layer connector of an LNG ship according to claim 5, characterized in that, The auxiliary installation device for installing the portal wedge block is as follows: the lower end of the connector is threadedly connected to the connecting rod by tightening the second nut on the connector, and then the first nut is tightened to move the first nut downward. The first nut drives the upper mounting plate downward through the pressure plate until the layer difference between the surface of the upper mounting plate of the portal wedge block and the adjacent insulation box meets the requirements. The tightening of the first nut is stopped, and then the adjusting bolt of the upper mounting plate is screwed into the threaded structure of the lower mounting plate to connect the upper mounting plate and the lower mounting plate.

7. The installation method for the SUPER+ secondary layer connector of an LNG ship according to claim 6, characterized in that, The layer difference between the upper mounting plate surface of the wedge block and the upper surface of the adjacent insulation box is ±0.5mm.

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