JPS5878881A - Construction method of hull - Google Patents

Abstract

PURPOSE:To improve the construction efficiency of a hull by constructing an upper shell and a bottom separately in a dock by floating the said upper shell in the dock filled with water and transferring it onto the said bottom for combining both of them. CONSTITUTION:In a dock, an upper shell 34 consisting of vertical bulkhead blocks 14, 15, outside shell blocks 16, 17, upper deck blocks 18-20, and others without a bottom is constructed separately from a bottom part 21 consisting of bottom shell blocks 11-13. Then, the dock is filled with water, and compressed air is injected into hollow chambers 35-37 of the upper shell 34. The said shell 34 is floated and transferred onto the bottom part 21, and combined together by joint parts 24, 25, 32, and 33. This construction permits to work under an open circumstance and improve the work efficiency.

Description

[Detailed Description of the Invention] According to the law, in particular, the upper hull is constructed by connecting each block of the hull except the bottom part at the dock, and the bottom part is constructed elsewhere in the dock and the bottom part is constructed at another location in the dock. The present invention relates to a hull construction method in which the above-mentioned upper hull is moved and placed on a portion, and these are joined to form a hull.

Generally, to construct a ship's hull in blocks, the bottom, bulkhead, side, upper deck, etc. that make up the ship's hull are divided into blocks of a size depending on the crane capacity, etc., and these are used to construct docks, etc. The hull shape is gradually formed by loading the bottom part located at the bottom of the ship, then the upper deck part located at the upper part, and then loading each block. The cutout parts are joined by welding to construct the □ hull.

FIG. 1 is a front sectional view of the central portion of the hull of an oil tanker, showing an example of a hull constructed by a conventional technique.

(4) is the bottom of the dock where the hull is built, and (B) is the support platform, which is formed by combining boards etc. to support the hull, and is located at 75'? Key points are provided. Other struts (not shown) are used for necessary parts. 1
%2 and 3 are the side bottom blocks, and the bottom shell plates 1a, 2a, 3a and the auxiliary plates 1b, 2b, 3
b, and is placed and maintained horizontally on a support stand (B). 4 and 5 are vertical bulkhead blocks, and vertical bulkhead plates 4a and 5
M and stiffener 4 b t 5 b, on the bottom shell plating l
They were killed vertically, facing left and right. 6, 1 is the ship side outer plate block, which includes the ship side outer plate 6m, 7m and the ribs 6b,
zb, and is vertically erected with the lower part connected to the curved outer plate provided at the outermost part of the bottom outer plate. Cross ties 6e and 7c are provided horizontally at the intermediate depth of the hull to connect the stiffeners 4a and 5a of the vertical bulkheads and the ribs 6b and yb of the side shell plating. 8 is the central upper deck block; upper deck 8
a and a beam member 8b.

9.10 is the side upper deck, upper deck 9 m, 10
Consists of &. A large number of bone members (not shown) are incorporated into the bottom shell block 1 to the side upper deck block 10, most of which are joined to the bone members of adjacent blocks by welding. Further, each of the blocks has a width dimension or a depth dimension as shown in the drawings, and a required length in the longitudinal direction of the hull (not shown in the drawings).

The blocks are loaded in the order of the numbers 1 to 10 given to the blocks, and are joined by welding at joints (not shown) to form a ring-shaped hull with the same length as the blocks. Note that each of the blocks 1 to 10 may be divided into a plurality of blocks in the width direction and depth direction.
The cross ties 6c and 7c may also have multiple stages.

By the way, the above-mentioned construction method of loading pipes in the upper part sequentially from the lower part dates back to the old days, when each member was connected by drilling holes in the joints of each member, overlapping them, and using rivets to connect each member. Although welding technology has advanced and the construction of block-type hulls has been implemented, in which joints are joined by welding, this method has continued to be carried out, but there are serious drawbacks in the actual construction situation. Only action was taken.

The above-mentioned difficulties are the poor working environment caused by the above-mentioned hull construction method, and the poor working efficiency caused by this. As a result, the work requires long hours of hard labor under adverse conditions, resulting in low efficiency work and long construction days.
This increased costs. That is, as mentioned above, the interior of the ship involves the work of joining a large number of joints, and the bottom shell plate.

The ship's side shell and upper deck made the ship's surroundings almost sealed, and it was necessary to install lighting during the day to bring in light, and as most of the joints were located in storage areas, work scaffolding had to be erected. In order to go back and forth to this joint, the worker must move along the scaffolding, and at this time, the worker must carry work tools and other equipment, and the joint must be moved back and forth. Most of the joining work is hard labor that requires manual labor, and the high temperatures caused by welding the joints and the generation of gas from the combustion of solvents make the working environment even worse, further contributing to low efficiency. In addition, the joining work of each joint part generates chips from parts and auxiliary parts, welding slag, etc. and accumulates on the bottom of the ship, which requires a lot of manpower to remove and clean. This refers to a situation in which a large number of personnel are forced to repeatedly enter and exit a ship in poor working conditions to carry out various work such as various inspections or repair work on a ship (hereinafter referred to as various works). It is something. As a means of dealing with the above situation, ventilation equipment can be inserted into the ship to provide ventilation, and instead of erecting scaffolding, scaffolding equipment that can be moved around the ship has been installed, and equipment such as lighting equipment, work tools, and welding machines have been installed. Research and development has also been carried out on work equipment incorporating the above, and efforts and efforts have been made to improve the working environment. This requires complicated handling, and unnecessary work such as cutting the transverse bulkhead in order to pass it through and carrying out later work 11' is required, and sufficient effects cannot be obtained. There were drawbacks such as.

The present invention was devised to effectively solve the above-mentioned problem of the poor working environment inside a ship.The purpose of this invention is to eliminate the near-sealed working condition inside a ship and to significantly improve ventilation. It is an object of the present invention to provide a hull construction method that can reduce heavy labor in various construction works, improve work efficiency, and shorten construction period.

An embodiment of the present invention will be described in detail below based on the accompanying drawings.

In Figures 2 to 4, AI is the bottom surface of the dock, and A
2. A3 is the dock side wall, A4. As is the ground surface of the upper edge of the dock. A required number of support stands B1 to B4, each of which is a combination of boards and the like for supporting the hull, are arranged on a portion of the dock bottom A1, and the bottom shell blocks 11, 12, and 13e are loaded. The bottom shell plate block 11, 12, 13 is the bottom shell plate 11a.
, 12m.

13M, the auxiliary plates 11b, 12b, 13b and the lower part 14e of the vertical bulkhead block 14.15, the curved outer plate 12c located between the 1000 side bottom block 12.13 and the side outer plate block 16.17.

13c, adjacent blocks located in the longitudinal direction of the hull are loaded one after another, and various works such as hull work to join the joints, fabrication work, and various other works are carried out in good condition with the top open. The construction is carried out in a working environment, and the ship bottom section 21 is constructed. On the other hand, in other places on the dock bottom AI, support stands C1 to C4 having a top curved at a height near one edge of the ship bottom 21 are formed by combining boards etc., and vertical bulkhead blocks 14.15 and A required number of them are arranged at the loading positions of the ship side shell blocks 16 and 17. Vertical bulkhead blocks 14.15 are loaded facing each other on the supports C2 and C3, and then the ship side shell blocks 16.17 are loaded on the supports CI and C4, and the cross ties 16e and 17e are attached with $ signs. Joint part 22 shown,
2 and 3 connect the above two blocks. The vertical bulkhead blocks 14, 15 are composed of vertical bulkhead plates 14a, 15a and stiffeners 1.
4b, 15b, and the ship side outer plate blocks 16.17 are the ship side outer plate 16a.

17a and rib members 15b, 17b, the stiffener 14
b + i 5 The lower edge of b is the support plate 12b of the bottom part 21
.

13b, and the upper edge is the beam member 18b of the central upper deck block above the side anti-stiffener surface.
Parts 14d and 15d of 28, 29 are incorporated.
is the joint part. The lower edges of the ribs 16b and i7b are the auxiliary plates 12b of the ship bottom 21.

13b, and the bead becomes a joint part 30.31 with the beam members 19b, 20b of the side upper deck blocks. Next, the central upper deck block 18 consisting of the central upper deck 18m and the beam member 18b is attached to the longitudinal bulkhead block 14.15.
The side upper deck 19a, 20m and the beam member 1
The side upper deck block 19.20 consisting of 9b and 20b is connected to the side shell block 16.17 and the longitudinal bulkhead block 14.1.
Upper hull 3 with only the bottom 21 removed and loaded between 5 and 5
4 is formed, and inside the hull construction work for joining the joints 22 to 31 of each of the blocks described above and other various construction works are performed in a state where the lower part is open and ventilation is good. In addition, materials, equipment, and tools for each construction work are brought in from the lower opening.
Since it can be carried out, these operations can be effectively improved.

In carrying out the above works, instead of erecting scaffolding as in the past, a lifting means such as a link type that can be raised and lowered in the vertical direction is installed on a trolley that can freely run on the bottom surface A1 of the dock (not shown). Slide feet that can be moved the required amount in the left-right direction and front-back direction #! Incorporate j.

It is also possible to load lighting lights, welding machines, and other work equipment to reduce manual labor as much as possible.

Since the bottom portion 21 does not exist below the upper hull 34, the work truck can freely pass through the space between the support platforms C1 to C4. The work trolley has a cross tie 16c in addition to one that can be used commonly for all construction work.

It is also possible to use dedicated ones for the lower part and the upper part of the part 17c. In parallel with the above-mentioned works, each block adjacent to the longitudinal direction of the hull was loaded one after another, and the various works inside the above-mentioned space were also progressed, including the vertical bulkhead part, the ship's side outer plating part, and the upper deck. The parts are integrated to form hollow chambers 35 and 36 inside.
．． 37 and an upper hull 34 is constructed.

Next, the third step is to place the upper hull 34 on the bottom part 21.
This is done as shown in the figure. This is done by filling the dock with water and injecting compressed air into the hollow chamber 35.36°31 of the upper hull 34 to float the upper hull 34 to a predetermined height. This is done by the moving force of a large winch (not shown) provided. In order to further ensure this buoyancy force, a buoyancy tank (not shown) may be attached to the outside of the ship's side shell plating (16m, 17a) and compressed air may be injected into it. While gradually discharging the compressed air from the upper hull 34 that has reached the bottom part 21, the bottom part 21f is placed on the bottom part 21f and drained from the dock. Then, the water remaining in the bottom part 21 and the compressed air in the upper hull 34 are also removed from the exhaust hole, pump, etc.
Exhaust from the hull from ζ. The shape of the hull is formed by placing the upper hull 34 on the bottom 21 as described above. Upper hull, 3.4 side stiffeners 14b, 15b and ribs 16b.

Joint part 24 between the lower edge of 17b and the upper edge of the support plate of the bottom part 21
, 25, 32, and 33 are joined. Only this joining work will be carried out on board as before. The above construction method is a.
The bow and stern parts, which have many curved parts, are formed by loading each block sequentially from the bottom to the top, as in the past.

As described above, the present invention is an innovative and effective new construction method that is completely different from conventional ship construction methods, and provides the following effects.

(1) By constructing the upper hull and the bottom of the ship separately, excluding the bottom of the ship, it is possible to avoid the closed working environment, which was a problem that could not be solved in the past, and improve the working environment inside the ship. is significantly improved.

(2) Various materials and tools used on board the ship can be brought in and out all at once from below using carts, etc., resulting in extremely high efficiency and significant labor savings.
Unexamined Japanese Patent Publication No. 58-78881 (4) (3
) Instead of erecting a work scaffold inside the ship, a work trolley equipped with a scaffold and work equipment can be used by moving it in and out from the lower space, so scaffolding-related materials and construction can be omitted, and the work trolley number assembly can be used. Constructed scaffolding improves work safety.

(4) Due to the actions and effects of each of the above items, hull work,
All the work such as la mounting work can be labor-saving, the working time can be reduced, and the hull construction period can be shortened.

[Brief explanation of the drawing]

Figure 1 is a front sectional view of the center hull of a general oil tanker, Figures 2 and 3 are front sectional views of the center hull being constructed by the method of the present invention, and Figure 4 is a front sectional view of the center hull of a general oil tanker constructed by the method of the present invention. FIG. 3 is a front sectional view of the hull. In the figure, 14.15 is a longitudinal bulkhead block, 16.17 is a side shell block, 18, 19.20 is an upper deck block, 3
4 is the upper hull, 35, 36, 37 is a hollow chamber, 21 is the bottom of the ship, and AI is the bottom of the dock. Patent applicant: Patent attorney representing Ishikawajima-Harima Heavy Industries Co., Ltd.
Nobuo Kinuya

Claims (1)

[Claims] Inside the dock, an upper hull with a hollow chamber will be built by connecting the vertical bulkhead, side shell plating, and upper deck, and
A ship bottom is constructed to be joined to the bottom of the upper hull, and then the dock is filled with water to float the upper hull while being moved and placed on the ship's bottom, and these parts are joined to construct the ship's hull. A hull construction method characterized by: