Method of installing a ship service access duct

Abstract

The application provides a method for installing a pipe in a service passage of a ship, comprising the following steps: S1, in a section assembly stage of the service passage, first installing a convex deck canting plate assembly, placing the convex deck canting plate assembly on a jig as a base surface, installing a rib plate assembly, a deck assembly and a longitudinal beam assembly; S2, installing a plurality of pipe supports and pipe clamps on the pipe supports for positioning the pipe in the service passage, so that the preset centers of the plurality of pipe supports in each pipe support are on a predetermined standard line in a length direction, and then installing a inner shell plate assembly after the installation of the pipe supports and the pipe clamps is completed; the preset center is a center position of the positions of the two fixed pipe clamps on each pipe support; and S3, in a section assembly stage, installing the pipe, so that an outer surface of the pipe is fitted with the preset center on each pipe support, and the pipe is fixed by the pipe clamps on the pipe supports. The method helps to disperse the installation pressure of the concentrated outfitting parts, and ensures the construction space and safety.

Description

Technical Field

[0001] This application relates to the field of shipbuilding technology, and more specifically, to a method for installing pipes in a ship service passageway. Background Technology

[0002] Currently, large LNG carriers use cargo holds instead of independent liquid tanks in their design. Due to this structural change, large LNG carriers now include service passageways. These service passageways are typically small but contain numerous outfitting components, including pipes and pipe supports and clamps for positioning and securing them. Currently, pipes and supports in the service passageway are usually installed in stage C (the large assembly stage with the base in place) or stage B (the large assembly stage with the gantry in place). The installation process in stages C / B involves simultaneously installing the pipes and supports; first, the supports are spot-welded for positioning, then the pipes are installed. During installation, the positions of the supports are repeatedly adjusted until the required precision is met, and then the supports are completely fixed by welding to ensure the installation accuracy between the pipes and supports. This increases the outfitting workload in stages C / B, extending the large assembly's time in place. Furthermore, the arrival date of the pipes is usually later than that of the supports, leading to a long accumulation of supports, occupying space, and increasing the risk of loss or damage. In addition, during the C / B stage installation, there is also the phenomenon of overhead welding of pipe supports. Overhead welding in a confined space presents problems such as high construction difficulty and difficulty in ensuring welding quality. Summary of the Invention

[0003] The purpose of this application is to provide a method for installing pipes in a ship service channel, which involves the early installation of pipe supports for fixing the pipes in the S stage, solving the problems of long concentrated installation cycle of outfitting components in the C / B stage, inability to install pipe supports due to delayed pipe delivery, and overhead welding of pipe supports.

[0004] A method for installing pipes within a ship's service passageway is provided. The service passageway assembly includes a rib plate group, a convex deck group, a convex deck inclined plate group, a longitudinal girder group, and an inner shell plate group. The installation method includes:

[0005] S1. During the assembly stage of the service channel segment, first install the middle assembly of the convex deck inclined plate, place it on the jig with the convex deck inclined plate as the base surface after installation, and then install the rib plate group, the middle assembly of the convex deck and the longitudinal girder group.

[0006] S2. When the middle assembly of the convex plate inclined plate is placed in the jig, multiple sets of pipe supports and pipe clamps on the pipe supports are installed in the service channel for positioning the pipes, so that the preset centers of multiple pipe supports in each set of pipe supports in the length direction are on a predetermined standard line. After the pipe supports and pipe clamps are installed, the middle assembly of the inner shell plate is installed; the preset center is the center position of the two fixed pipe clamps on each pipe support.

[0007] S3. During the segmented assembly stage, install the pipes so that the outer surface of the pipes fits the preset center on each pipe support, and use the pipe clamps on the pipe supports to fix the pipes.

[0008] In one implementation, step S2, which involves installing multiple sets of pipe supports for positioning pipes within the service channel, such that the preset centers of multiple pipe supports in each set are aligned along a predetermined standard line in the length direction, includes:

[0009] Mark the center position of the two fixed pipe clamps on each pipe support. Install the first pipe support in each group of pipe supports according to the preset installation standard. Use a laser emitting device to emit a laser so that the path of the emitted laser is close to and coincides with the mark on the first pipe support. Then install the other pipe supports in each group of pipe supports according to the laser path so that the marks on the installed pipe supports are close to and coincide with the laser path.

[0010] In one embodiment, the laser emitting device includes a laser head, a telescopic support rod, and a base. The laser head is fixed to the base via the telescopic support rod. By fixing the base to the frame and adjusting the height of the telescopic support rod, the path of the laser emitted by the laser head is made close to and coincides with the marking on the first tube support.

[0011] In one embodiment, marking the center position of the two fixed pipe clamps on each pipe support includes drawing a line along the circumference of the pipe support at the center position of the two fixed pipe clamps on each pipe support.

[0012] In one embodiment, the laser head is cylindrical, and the laser is emitted along the axis of the cylindrical laser head. At least one end face of the cylindrical laser head includes an upper part of the laser head and a lower part of the laser head, which are divided by the axis of the laser. The upper part of the laser head located above the axis protrudes from the lower part of the laser head located below the axis. A stepped groove structure is provided at the junction of the upper part of the laser head and the lower part of the laser head.

[0013] In one embodiment, bringing the path of the emitted laser close to and aligning with the marking on the first tube support includes:

[0014] The laser head is positioned so that its upper part is attached to the edge of the angle steel of the first tube support by means of a stepped groove structure. The position of the laser head is then finely adjusted so that the path of the emitted laser closely overlaps with the markings on the first tube support.

[0015] In one embodiment, the base is provided with magnets for fixing to the jig.

[0016] In one implementation, in step S2, when the outer surface of the convex deck inclined plate group is used as the base surface, after the pipe support is installed, the inner shell plate group is first spot welded to position it, then the service channel is turned over, and after turning over, the fillet weld of the inner shell plate group is welded.

[0017] In one implementation, the installation of the first pipe support according to the preset installation standard includes first spot welding the first pipe support, and then fine-tuning the first pipe support during the segmented connection stage in the large assembly stage, so that the first pipe support meets the accuracy requirements of pipe connection.

[0018] The method for installing pipes within the ship service channel in this application has the following advantages:

[0019] 1. This invention addresses the pre-installation of pipe supports using laser tooling for positioning, ensuring the installation accuracy of the pipe supports. It also provides a feasible construction method to improve the efficiency of segmented construction when pipes and pipe supports cannot be installed simultaneously.

[0020] 2. For some pipes that affect the coating process, pipe supports can be installed in advance before coating begins. The pipes can be installed after coating is completed, saving manpower and material resources that would otherwise be wasted by repeatedly disassembling the pipes.

[0021] 3. By installing pipe supports in advance, some outfitting can be moved to the S stage for installation, reducing the installation pressure caused by the excessive concentration of outfitting components in the C / B stages.

[0022] 4. Install pipe supports and clamps in stage S to avoid overhead welding of pipe supports and ensure construction space and safety for pipe supports and other outfitting components. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram illustrating a structure assembled in a service channel according to an embodiment of this application;

[0025] Figure 2 This is a schematic diagram illustrating a structure for installing multiple sets of pipe supports within a service channel, according to an embodiment of this application.

[0026] Figure 3 This is a schematic diagram illustrating a segmented large-scale assembly stage for installing pipes according to an embodiment of this application;

[0027] Figure 4This is a schematic diagram illustrating the structure of a pipe support and pipe clamp according to an embodiment of this application;

[0028] Figure 5 This is a schematic diagram of the structure of a laser emitting device according to an embodiment of this application;

[0029] Figure 6 This is a schematic diagram of the structure of a laser head according to an embodiment of this application.

[0030] 100. Service passage middle group; 110. Rib plate group; 120. Convex deck inclined plate middle group; 130. Convex deck middle group; 140. Inner shell plate middle group; 160. Longitudinal girder group; 200. Pipe support; 210. Preset center; 220. Pipe clamp; 221. Fixed pipe clamp position; 300. Pipe; 400. Laser emitting device; 410. Laser head; 411. Upper part of laser head; 412. Lower part of laser head; 420. Telescopic support rod; 430. Base. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0033] This application provides a method for installing pipes in a ship service channel. Figure 1 This is a schematic diagram illustrating the structure of group 100 in a service channel according to an embodiment of this application. See also... Figure 1 The service passage's central assembly includes a rib plate group 110, a convex plate central assembly 130, a convex plate inclined plate central assembly 120, and an inner shell plate central assembly 140. The installation of pipes within the service passage specifically includes the following steps:

[0034] S1, see also Figure 1 In the service channel segment assembly stage, first install the convex deck inclined plate middle group 120, and place it on the jig with the convex deck inclined plate as the base surface after installation. Then install the rib plate group 110, the convex deck middle group 130 and the longitudinal girder group 160.

[0035] S2, see also Figure 2When the convex plate inclined plate assembly 120 is placed in the jig, multiple sets of pipe supports 200 and pipe clamps 220 on the pipe supports are installed in the service passage, so that the preset centers 210 of the multiple pipe supports 200 in each set of pipe supports in the length direction are on a predetermined standard line. After the pipe supports 200 and pipe clamps 220 are installed, the inner shell plate assembly 140 is then installed; see also Figure 4 The preset center 210 is the center of the position 221 of the two fixed pipe clamps on each pipe support 200; wherein, one end of the pipe clamp 220 is fixed, that is, inserted into the opening of the pipe support and fixed with a nut, and the other end of the pipe clamp 220 is in a free state.

[0036] S3, see also Figure 3 During the segmented assembly stage, pipes 300 are installed, ensuring their outer surface aligns with the preset center 210 on each pipe support 200. Pipe clamps 220 on the pipe supports 200 are then used to secure the pipes 300. After the pipes 300 are installed, the pipe clamps 220 are removed, and both ends of the clamps 220 are inserted into the openings of the pipe supports 200 and secured with nuts.

[0037] In the above implementation process, this invention advances the installation of pipe supports and clamps used to fix the pipes to stage S (the assembly stage in the segmented assembly phase). That is, some outfitting components are installed in advance, and after the pipe supports are positioned, the inner shell plate is assembled with the cover plate. The installation accuracy of the pipe supports is ensured through positioning. This method of pre-installing pipe supports has several advantages. First, for pipes that affect painting, the phased installation of pipe supports and pipes reduces repeated disassembly of pipes, saving manpower and resources. Second, moving some outfitting to stage S alleviates some of the installation pressure of outfitting components in stages C / B, improving construction efficiency and shortening the time spent on the fixture. It also avoids overhead welding, reducing construction difficulty and improving welding quality. Furthermore, it avoids situations where construction is impossible due to delayed pipe delivery, providing a phased installation method when pipes and pipe supports cannot be installed simultaneously for various reasons. This method is not only applicable to liquefied gas carriers but also to similar situations in other ships.

[0038] To ensure accurate installation of subsequent pipes and reduce construction deviations caused by multiple pipe clamps on each set of pipe supports not being on the same horizontal plane, in one embodiment, S2, multiple sets of pipe supports for positioning pipes are installed in the service channel. The preset centers of multiple pipe supports in each set along their length are aligned on a predetermined standard line, including the center of the positions 221 of the two fixed pipe clamps on each pipe support 200. The first pipe support in each set is installed according to the preset installation standard. A laser is emitted using a laser emitting device 400, ensuring the laser path is close to and coincides with the marking on the first pipe support. Then, other pipe supports in each set are installed sequentially according to the laser path, ensuring that the markings on the installed pipe supports are all close to and coincide with the laser path. Specifically, the first pipe support for positioning the pipe according to the installation drawing uses a laser positioning fixture to simulate the pipe diameter. In the above implementation process, since the diameter of the pipe is fixed, the center of the pipe clamp on the pipe support is used as the positioning reference of the pipe. By ensuring that the contact point between the pipe and each pipe support is on a straight line, the accurate positioning of the pipe, pipe support and pipe clamp is guaranteed, which conforms to the positioning data in the installation drawing.

[0039] In one implementation scheme, see Figure 5 The laser emitting device 400 includes a laser head 410, a telescopic support rod 420, and a base 430. The laser head 410 is fixed to the base 430 via the telescopic support rod 420. By placing the base 430 on the jig and adjusting the height of the telescopic support rod 420, the path of the laser emitted by the laser head 410 is brought close to and coincides with the marking on the first pipe support. By setting up a fixed and telescopically adjustable laser device, a laser path is constructed on the service channel of the intermediate assembly. The laser path serves as a predetermined standard line for the installation of other pipe supports. The entire process is easy to operate and has high measurement accuracy.

[0040] In one embodiment, marking the center of the two fixed pipe clamp positions on each pipe support involves drawing a line along the circumference of the pipe support at the center of the two fixed pipe clamp positions on each pipe support. Marking the center with a line further ensures the coincidence of the laser with the preset center of the pipe support, and also further ensures that each pipe support is in a plane, thereby improving the installation accuracy of the pipe clamps.

[0041] In one implementation scheme, see Figure 6The laser head 410 is cylindrical and can rotate along its central axis. The laser beam is emitted along the axis of the cylindrical laser head. At least one end face of the cylindrical laser head includes an upper portion 411 and a lower portion 412, divided by the axis along which the laser beam originates. The upper portion 411, located above the axis, protrudes beyond the lower portion 412. A stepped groove structure is provided at the junction of the upper portion 411 and the lower portion 412. That is, by adopting a cylindrical shape and providing a stepped groove structure, which involves locally cutting a planar notch, it can be stably positioned parallel to the pipe support, facilitating positioning with the pipe support and adjusting the height during precision measurement.

[0042] The specific measurement process is as follows: the upper part 411 of the cylindrical laser head is arranged to fit against the edge of the angle steel of the first tube support through a stepped groove structure. Then, the position of the laser head 410 is finely adjusted so that the path of the emitted laser closely coincides with the mark on the first tube support. By setting the stepped groove structure, the laser emitting device 400 can be mounted on the first tube support as an auxiliary means for laser, making it easier to adjust the degree of fit between the laser and the mark on the first tube support.

[0043] In one embodiment, the base 430 is provided with magnets for fixing to the jig. The base has magnets underneath for easy fixing; during construction, the laser emitting device is attached to the reference surface (which can be the jig) using the magnets. This can meet the measurement requirements of reference surfaces with different flatness levels.

[0044] In one embodiment, in S2, when the outer surface of the convex deck inclined plate mid-assembly 120 is used as the base surface, after the pipe support 200 is installed, the inner shell plate mid-assembly 140 is first tack welded to position it, then the service passage is turned over, and the fillet weld of the inner shell plate mid-assembly 140 is welded after turning over. In this application, the inner shell plate mid-assembly is installed last, which reduces the difficulty of hoisting the outfitting components inside the service passage, and increases the space for hoisting the mid-assembly after it is erected and turned over. In addition, tack welding for positioning and then turning over to weld the fillet weld can avoid overhead welding.

[0045] In one implementation scheme, installing the first pipe support according to a preset installation standard includes first spot welding the first pipe support, and then fine-tuning the first pipe support during the segmented assembly stage to ensure that the first pipe support meets the accuracy requirements for pipe connection. Because there are pipe connections before and after each segmentation, to ensure that the pipe connection accuracy between segments is within ±3mm, the first pipe support at the large joint of each segment is positioned by spot welding. After the segmented connection, the pipe support is adjusted to meet the connection accuracy requirements before welding.

[0046] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A method for installing pipes within a ship service channel, characterized in that, The service channel assembly includes a rib plate group, a convex plate group, a convex plate inclined plate group, a longitudinal girder group, and an inner shell plate group. The installation method for the pipes within the service channel includes: S1. During the assembly stage of the service channel segment, first install the middle assembly of the convex deck inclined plate, place it on the jig with the installed convex deck inclined plate as the base surface, and then install the rib plate group, the middle assembly of the convex deck and the longitudinal girder group. S2. When the middle assembly of the convex plate inclined plate is placed in the jig, multiple sets of pipe supports and pipe clamps on the pipe supports are installed in the service channel for positioning the pipes, so that the preset centers of multiple pipe supports in each set of pipe supports in the length direction are on a predetermined standard line. After the pipe supports and pipe clamps are installed, the middle assembly of the inner shell plate is installed; the preset center is the center position of the two fixed pipe clamps on each pipe support. S3. During the segmented assembly stage of the service channel, install pipes so that the outer surface of the pipes fits the preset center on each pipe support, and use the pipe clamps on the pipe supports to fix the pipes. In step S2, the installation of multiple sets of pipe supports for positioning pipes within the service channel, such that the preset centers of multiple pipe supports in each set of pipe supports are on a predetermined standard line in the length direction, includes: Mark the center position of the two fixed pipe clamps on each pipe support. Install the first pipe support in each group of pipe supports according to the preset installation standard. Use a laser emitting device to emit a laser so that the path of the emitted laser is close to and coincides with the mark on the first pipe support. Then install the other pipe supports in each group of pipe supports according to the laser path so that the marks on the installed pipe supports are close to and coincide with the laser path.

2. The method for installing pipes in a ship service channel according to claim 1, characterized in that, The laser emitting device includes a laser head, a telescopic support rod, and a base. The laser head is fixed to the base by the telescopic support rod. By fixing the base to the frame and adjusting the height of the telescopic support rod, the path of the laser emitted by the laser head is made close to and coincides with the marking on the first tube support.

3. The method for installing pipes in a ship service channel according to claim 1, characterized in that, Marking the center position of the two fixed pipe clamps on each pipe support involves drawing a line along the circumference of the pipe support at the center position of the two fixed pipe clamps on each pipe support.

4. The method for installing pipes in a ship service channel according to claim 2, characterized in that, The laser head is cylindrical, and the laser is emitted along the axis of the cylindrical laser head. At least one end face of the cylindrical laser head includes an upper part of the laser head and a lower part of the laser head, which are divided by the axis of the laser. The upper part of the laser head located above the axis protrudes from the lower part of the laser head located below the axis. A stepped groove structure is provided at the junction of the upper part of the laser head and the lower part of the laser head.

5. The method for installing pipes in a ship service channel according to claim 4, characterized in that, The step of aligning the path of the emitted laser with and coinciding with the marking on the first tube support includes: The laser head is positioned so that its upper part is attached to the edge of the angle steel of the first tube support by means of a stepped groove structure. The position of the laser head is then finely adjusted so that the path of the emitted laser closely overlaps with the markings on the first tube support.

6. The method for installing pipes in a ship service channel according to claim 2, characterized in that, The base is equipped with magnets for fixing it to the jig.

7. The method for installing pipes in a ship service channel according to claim 1, characterized in that, In S2, when the outer surface of the convex deck inclined plate group is used as the base surface, after the pipe support is installed, the inner shell plate group is first spot welded to position it, then the service channel is turned over, and after turning over, the fillet weld of the inner shell plate group is welded.

8. The method for installing pipes in a ship service channel according to claim 1, characterized in that, The installation of the first pipe support according to the preset installation standard includes first spot welding the first pipe support, and then fine-tuning the first pipe support during the segmented connection during the large assembly stage, so that the first pipe support meets the accuracy requirements of pipe connection.

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