JPS6239391A - Support structure for vertically-installed cylindrical tank for ship - Google Patents

Abstract

PURPOSE:To eliminate reinforcing of a bottom plate and to facilitate checking and repair of a bottom part, by a method wherein a distance between adjoining small bendproofing materials of a number of small bendproofing materials placed in juxtaposition to a tank bottom is decreased over a distance between supporting materials situated so as to cross the small bendproofing material at right angles, and a space part is formed between the support materials. CONSTITUTION:The empty weight of a cylindrical tank 11 and the weight of a content are supported to a double bottom top plate 2 through a support material 3, and a support reaction force from the support material 3 is exerted on the tank bottom plate 12 through a heat insulating support material 4. In which case, since the bottom plate 12 is reinforced by a number of small bendproofing materials 13 disposed at a narrow distance so as to cross the support material 3 at right angles, a load applied on the bottom plate 12 is widely dispersed to prevent production of an excessive load. This eliminates reinforcing of the bottom plate 12 by means of a large bendproofing material, and enables a tank to be manufactured lightly and in a simple structure. A worker enters or a device and a material are conveyed in a space part 18 between the bottom plate 12 and a double bottom top plate 2, and this enables facilitation of a checking and a repairing work of the tank 11 after completion of building of the bottom plate 12.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a support structure for supporting vertical cylindrical tanks in ships used to transport hot or cold liquids.

[Conventional technology]

Conventional upstream, low-temperature liquefaction steam luck W! BACKGROUND OF THE INVENTION Vessels having square tanks inside are often used as carriers for transporting ships, high-temperature asphalt, molten sulfur, and the like.

In the marine square tank support structure of such ships,
As shown in Figure 10.11, the double bottom top plate 2 inside the hull 1
A plurality of tank support stands 3 are arranged along the longitudinal direction of the hull at required intervals. The lower end of this tank support 3 is fixed to the double bottom top plate 2, and the upper end thereof is attached with a heat insulating support material 4 made of a heat insulating material such as reinforced plywood or phenolic resin and having a large compressive strength. ing.

A rectangular tank 21 is placed and fixed on these heat insulating supports 4, and this tank 21 has an outer shell composed of a flat tank outer plate 12, and these tank outer plates. 12 has a large stiffening member on its inner surface.
- It is reinforced by providing the frame 14a, the web 14b, and the steel 7s 13 as small stiffeners.

The outer periphery of the tank outer plate 12 is covered with a heat insulating material 15, and the weight of the tank 21 and the weight of its contents are supported by the double floor top plate 2 via the tank support 3. .

Furthermore, the tank 21 is fixed to the hull 1 by a roll anchor and a binching anchor (not shown), so that even if the hull 1 moves, the tank 21 does not move in the left-right direction and the front-back direction.

In the conventional marine rectangular tank support structure constructed as described above, the height of the tank support stand 3 is equal to the height of the double floor top plate 2.
The height is set so that people and equipment can be accommodated in the space 18 between the bottom plate 17 of the tank 21 and the tank bottom plate 17 of the tank 21, and the large end of working tools and equipment are carried into this space 18. As a result, work to cover the outer periphery of the tank bottom plate 17 with the heat insulating material 15, inspection of the tank 21, various inspections, and repair work are performed during or after the construction of the marine square tank support structure.

Note that the tank 21 is a structure independent of the hull structure, and is designed not to share the various loads applied to the hull 1.

By the way, instead of the square tank 21 as described above,
In recent years, carrier ships have been developed that are equipped with vertical cylindrical tanks that have a shell structure and have no stiffeners on the inner surface of the tank outer panels.

Is this cylindrical tank with an eel shell structure made possible by the various stiffeners mentioned above? I! Compared to a rectangular tank 21 with a 1.1 strength, the structural weight can be reduced for the same design strength requirements, the number of component parts can be reduced, and the tank surface area relative to the tank volume is advantageous.

As a tank support structure for supporting a cylindrical tank inside the ship, a heat insulating support material is tightened on top of the double acid Fi (see numeral 2 in Figure 10.11), and a cylindrical tank is placed on top of this heat insulating support material. A flat-standing tank support structure has been developed that supports the bottom of the tank over a wide area by placing it on the tank.

[Problem that the invention seeks to solve]

However, in the vertical cylindrical tank support structure of such ships, there is no space between the tank bottom plate and the double floor top plate (see reference numeral 18 in Figures 10 and 11) into which people and equipment can enter. Therefore, there is a problem in that it poses a serious problem especially when carrying out inspection or repair work on the bottom of the tank.

The tank support structure for supporting the cylindrical tank inside the ship is almost the same as the above-mentioned conventional marine square tank support MII structure, and a heat insulating support material (see reference numeral 4 in Fig. 11) is provided at the upper end. Mounted tank support (No. 10.1)
(See reference numeral 3 in Figure 1), a tank support structure in which a cylindrical tank is supported on a double acid plate has also been developed, but in such a cylindrical tank support structure with marine equipment,
An excessive concentrated load will be applied to the tank bottom plate from the tank support base, and this tank bottom plate will need to be strongly reinforced with stiffening materials of various sizes.

Therefore, in this case, the structure of the tank bottom plate becomes complicated, the number of its constituent members increases, the number of man-hours required to manufacture the cylindrical tank increases, and the weight of the cylindrical tank as a whole increases. There is a point.

The present invention aims to solve the above-mentioned problems, and eliminates the need to reinforce the tank bottom plate of a cylindrical tank with a large stiffener, reducing the weight of the cylindrical tank, and making it possible to reduce the weight of the cylindrical tank. An object of the present invention is to provide a vertical cylindrical tank support structure for ships, which can secure a space between the double floor top plate of the tank and the bottom plate of the tank to accommodate people, equipment, etc.

[Means for solving problems]

For this reason, the cylindrical tank support structure for marine equipment of the present invention is provided with a plurality of support members whose lower ends are fixed to the ship's hull and are arranged at a required horizontal distance from each other. The bottom part is composed of a tank bottom plate and a number of small stiffeners arranged in a row on the tank bottom plate, and the small stiffeners are arranged almost orthogonally to the supporting members, and the small stiffeners It is characterized in that the mutual spacing in the horizontal direction of the members is narrower than the mutual spacing in the horizontal direction of the supporting materials.

[For production]

The above-mentioned marine vertical ra of the present invention! 1. In the cylindrical tank support structure, the bottom of a vertical cylindrical tank is mounted on the hull so as to be supported by I number of supports, and the bottom of the cylindrical tank is supported by a plurality of small barriers that make up the bottom. It is reinforced by the flexure member and the plurality of tank supports, and a space is secured between the tank bottom plate of the cylindrical tank and the double floor top plate of the hull for people and equipment to enter.

〔Example〕

Hereinafter, embodiments of the present invention will be explained with reference to the drawings.
1 to 3 show a cylindrical tank support structure for marine equipment as a first embodiment of the present invention. FIG. 1 is a front sectional view of a ship equipped with the same support structure, and FIG. FIG. 3 is a plan view of the bottom of the tank showing the arrangement of materials and small stiffeners, and FIG.

As shown in FIGS. 1 to 3, a plurality of (
In this embodiment, four supporting members 3 are arranged concentrically at equal intervals.

Each support member 3 is installed with its lower end fixed on the double bottom top plate 2, while a 7 run section is formed at the upper end of each support member 3 along the tank bottom plate. A heat insulating support material 4 is attached to the top of the tank, and a tank 11 is mounted on this heat insulating support material 4 for IH.

Note that the outer periphery of the tank 11 is covered with a heat insulating material 15 except for the contact portion with the heat insulating support material 4.

At this time, the height of the support members 3 is set so that people and equipment can be accommodated in the space 18 between the double floor top plate 2 and the tank bottom plate 12, and each support member 3 is not shown. An opening is formed.

On the other hand, on the tank bottom plate 12 inside the tank 11, a large number of small stiffeners 13 having 7 run sections at the top are arranged radially in a positional relationship perpendicular to the supporting members 3 arranged in concentric circles. It is arranged.

The small stiffeners 13 are arranged such that the number of the small stiffeners 13 increases toward the outer periphery, so that the mutual spacing between the small stiffeners 13 does not become excessive. These intervals depend on the hydraulic pressure inside the cylindrical tank 11, the thickness of the tank bottom plate 12, the support span and rigidity of the support material 3, etc.
The spacing between the small stiffeners 13 is determined to be approximately 500 mm to 1000 mm. Further, the mutual spacing between the supporting members 3 is determined to be approximately 1500 mI11 to 4000+am.

Further, the tank 11 of this embodiment has a vertical cylindrical shape, the tank bottom plate 12 has a slight curvature, and has no stiffening material other than the small stiffener 13 provided on the tank bottom plate 12. It has a v1 structure.

Further, the cylindrical tank 11 is fixed to the hull 1 by an anchor ring 16, so that even if the hull 1 moves, the cylindrical tank 11 does not move in the left-right direction and in the backward direction.

Since the cylindrical tank support assembly with marine equipment as the first embodiment of the present invention has the structure 61 as described above, the weight of the cylindrical tank 11 and the weight of its contents are transferred through the support member 3. It is supported by a heavy floor top plate 2.

At this time, the support reaction force from the support material 3 is applied to the tank bottom plate 12 via the heat insulating support material 4, but the tank bottom plate 12 is connected to a large number of small Since it is reinforced by the stiffener 13, the tank bottom plate 12
The load applied to the tank is widely dispersed, and excessive stress is not generated on the tank bottom plate 12.

Therefore, there is no need to reinforce the tank bottom plate 12 of the cylindrical tank 11 with a large stiffener, etc. as in the conventional case (the cylindrical tank 11 has a lightweight and simple structure, and the number of constituent members is small. , the labor required for its production and maintenance is greatly reduced.

In addition, the space 1 between the tank bottom plate 12 and the double floor top plate 2
The cylindrical tank 11 may be damaged during construction or after completion of the work to cover the tank bottom plate 12 with a heat insulating material or the construction of the cylindrical tank support structure with the above-mentioned marine equipment, due to the large end of work tools or equipment being brought in at step 8. Inspections, various inspections, and repair work will be carried out. In particular, in the space 18, movement in the circumferential direction between a point Q on the periphery of the cylindrical tank 11 and a point P below the cylindrical tank 11 shown in FIG. This is easily carried out through an opening (not shown) that is formed.

Furthermore, in the three-place marine cylindrical tank support structure of this embodiment, since the small stiffeners 13 are substantially straight, the small stiffeners 1
3 is almost unnecessary, and although roll bending is necessary for the supporting members 3, since the height of each supporting member 3 is constant, there is little waste in cutting the material. Therefore, the manufacturing of these small stiffeners 13 and upstream supports 3 can be done easily and economically by polishing.

In addition, the small stiffener 13 on the tank bottom plate 12 inside the tank 11
are arranged radially, so that when the liquid in the tank 11 is discharged or the like, the flow of the liquid to the lowest part of the inner shaft of the tank 11 is hardly obstructed.

Next, Figures 4 to 6 show a three-position marine cylindrical tank support structure as an embodiment of pJS2 of the present invention. Figure 4 is a front sectional view of a ship equipped with the same support structure, and Figure f55 is its FIG. 6 is a plan view of the bottom of the tank showing the arrangement of the support members and small stiffeners, and FIG. 6 is an enlarged perspective view showing the section ``■'' in FIG. 5 cut away.

As shown in FIGS. 4 to 6, the tank bottom plate 12 is formed horizontally except for the peripheral portion. On the double bottom top plate 2 inside the hull 1, a plurality of supports 3 for supporting the vertical cylindrical tank 11 are arranged in the transverse direction of the hull between the double acid @2 and the bottom shell plate. It is placed directly above the installed aggregate (floor).

Note that seven ring portions are formed on the upper part of the support member 3.

Both ends of these supporting members 3 are cut off at the peripheral edge of the cylindrical tank 11, and a ring γ-gage 23 is disposed above the peripheral edge to connect these ends. A gap is formed between this ring 23 and the double bottom top plate 2.

In addition, on the tank surface 7 of the support member 3 and the ring 23
A heat insulating support material 4 is attached to the upper surface, and a tank 11 is placed on these heat insulating support materials 4.
The outer periphery of the tank 11 is covered with a heat insulating material 15 except for the contact portion with the heat insulating support material 4.

At this time, the heights of the support member 3 and the ring 23 are set so that the space 18 between the double-bottomed top plate 2 and the tank bottom plate 12 is sufficiently large for people and equipment.

On the other hand, on the tank bottom plate 12 inside the tank 11, a large number of small stiffeners 13 each having 7 ring parts on the upper part are arranged on each supporting member 3.
They are arranged parallel to the longitudinal direction of the hull and at regular intervals so as to be perpendicular to the longitudinal direction of the hull.

The spacing between the small stiffeners 13 is set smaller than the spacing between the supporting materials 3, as in the first embodiment.

Further, the tank 11 of this embodiment is also vertically placed and cylindrical, and has a Wl 6N construction with no stiffeners other than a small stiffener 13 provided on the tank bottom plate 12.

Furthermore, the cylindrical tank 11 is fixed to the hull 1 by an anchor ring 16, so that even if the hull 1 moves, the cylindrical tank 11 does not move in the left-right direction and the front-back direction.

Since the marine three-place cylindrical tank support cypress according to the second embodiment of the present invention is constructed as described above, substantially the same functions and effects as those of the first embodiment of the present invention can be obtained. In the second embodiment, since a large number of small stiffeners 13 and supporting members 3 are arranged in a straight line, there is no need to bend the members, and each small stiffener 13 and each supporting member 3 are arranged in a straight line. Since the height is constant, manufacturing is extremely easy, and the material can be cut out more economically.

Furthermore, since each support material 3 is provided directly above the aggregate (70a) in the double bottom, the strength of the ship bottom and tank bottom is further improved, and the passage in the space 18 at the tank bottom is almost constant. Since it can be formed with a width of

Figures 157 to 9 show a three-place cylindrical tank support structure for marine vessels as a third embodiment of the present invention, Figure 7 is a front sectional view of a ship equipped with the same support structure, and Figure 8 shows its support material. 9 is a plan view taken along the tank bottom showing the arrangement of small stiffeners, and FIG. 9 is an enlarged perspective view cut away at the section ``■'' in FIG. 8.

As shown in ptS7 to 9 figures, the tank bottom plate 12
Like the example, it is formed with a slight curvature,
A plurality of supporting members 3 for supporting a vertically placed cylindrical tank 11 are arranged radially on a double bottom top plate 2 in the hull 1.

Since the mutual spacing between these supporting materials 3 increases toward the outer periphery, the number of supporting materials 3 is increased near the outer periphery so that the mutual spacing between the supporting materials 3 does not become excessive.

Seven rungs are formed on the upper part of these supports 3, and heat insulating supports 4 are attached on the seven rungs at appropriate intervals.

On the other hand, on the lower surface of the tank bottom plate 12 of the tank 11, a large number of small stiffeners 13 each having seven run sections at the lower end are installed concentrically at equal intervals. The heat insulating support material 4 on the support material 3 is arranged so as to engage with the seven run portions at the lower end of the small stiffener 13, and the small stiffener 13 is placed on this heat insulating support material 4.

In this way, the tank 11 connects the support material 3 through the small stiffener 13 installed on the tank bottom plate 12 and the heat insulating support material 4.
placed on top.

In this embodiment as well, the mutual spacing between the small stiffeners 13 is set to be smaller than the mutual spacing between the supporting materials 3.

In addition, the height of the support material 3 is the same as that of the double bottom top plate 2 and the small stiffener 13.
The height is set so that people and equipment can fit into the space 18 between the lower end and the lower end.

Furthermore, the tank 11 of this embodiment also has a vertical cylindrical shape and has an R structure with no stiffeners other than the small stiffener 13 provided on the tank bottom plate 12, and the outer periphery of the tank 11 is , covered with a heat insulating material 15.

The vertical cylindrical marine tank support structure as the PIS3 embodiment of the present invention is constructed as described above (h), so that almost the same operation and effect as the first embodiment of the present invention can be obtained.
In particular, in this fpJ3 embodiment, the tank bottom plate 12 inside the tank 11 is smooth without any stiffening material, so even when discharging a highly viscous liquid such as asphalt, liquid flow is good and the tank bottom plate 12 is smooth. Cleaning work becomes extremely easy.

In addition, in the space 18, the support material 3 may impede traffic +yQ from a point Q on the periphery of the cylindrical tank 11 to a point P below the cylindrical tank 11 as shown in FIG. It can be reached in a straight line.

Moreover, by supporting the cylindrical tank 11 by being arranged concentrically with the oval tank bottom @ 12, the small stiffeners 13 can be supported in any direction from the center of the tank bottom plate 12. Since a uniform load is applied to the support member 3 and the small stiffener 13, the design of the support member 3 and the small stiffener 13 is simplified and facilitated.

Furthermore, since the supporting member 3 is constituted by a flat plate, there is an advantage that bending of the plate material is almost unnecessary when manufacturing the supporting member 3.

〔Effect of the invention〕

As detailed above, according to the vertical marine cylindrical tank support structure of the present invention, a plurality of supporting members are arranged at required horizontal intervals with their lower ends fixed to the ship's hull. In addition, the bottom of the tank is composed of a tank bottom plate and a number of small stiffeners arranged in a row on the tank bottom plate, and the small stiffeners are connected to the support members and one! The structure of the cylindrical tank is improved by a simple structure in which the small stiffeners are arranged almost orthogonally to each other, and the horizontal mutual spacing of the small stiffeners is narrower than the horizontal mutual spacing of the supporting members. Since an excessive concentrated load from the support structure is not applied to the tank bottom plate, there is no need to reinforce the tank bottom plate with a large stiffener, and the weight of the cylindrical tank is significantly reduced, and its members The number is also reduced, reducing the labor and cost required for production.

In addition, there is a possibility that a person or
In order to ensure that there is a space for equipment, etc., and for people and equipment to pass through the space efficiently,
As work tools and equipment are brought into this space, construction work to cover the tank bottom plate with heat insulating material and the above-mentioned marine shaft r! Inspection, various inspections, and repair work of the cylindrical tank during construction or after completion of the cylindrical tank support structure can be carried out efficiently.

Furthermore, the support structure consisting of the support material and the small stiffener has a simple structure, which not only makes it easy to manufacture, but also allows the support material and the small stiffener to work together to reinforce the bottom of the tank. It will become.

[Brief explanation of drawings]

1 to 3 show a support structure for a three-place cylindrical tank for ships as a first embodiment of the present invention, and FIG.
Figure 2 is a plan view of the bottom of the tank showing the arrangement of its supporting members and small stiffeners, and Figure 3 is an enlarged perspective view showing the section ■ in Figure 2 cut away. and the fourth
Figures 1 to 6 show a support structure for a three-place cylindrical tank for ships as a second embodiment of the present invention, Figure 14 is a front cross-sectional view of a ship equipped with the same support structure, and Figure 5 shows its support material and small tank support structure. A plan view of the tank bottom showing the stiffener placement needle, Figure 6 is the 5th
It is an enlarged perspective view showing a broken part ■ in the figure, and FIGS. 7 to 9 show a three-position marine cylindrical tank support structure as a third embodiment of the present invention, and FIG. 7 shows the same support structure. Fig. 9 is a front sectional view of a ship equipped with It is an enlarged perspective view, and the first
0.11 shows a conventional marine square tank support structure, FIG. 10 is a front sectional view of a ship equipped with the same support structure, and FIG. 11 is an enlarged sectional view of section XI of the t510 drawing. 1. Hull, 2. Double bottom and top plate, 3. Support material, 4.
Heat insulation support material, 11. Cylindrical tank, 12. Tank bottom plate, 13. Small stiffener, 15. Heat insulation material, 16. Anchor ring, 18. Space, 23. Ring . Sub-Agent Patent Attorney Yoshihiko Iinuma Figure 1 Figure 3 Figure 4 Figure 6 Figure 7 Strategy Figure 8

Claims (1)

[Claims] The bottom of the tank is provided with a plurality of supports arranged at required horizontal intervals so that the lower end is fixed to the ship's hull, and the bottom of the tank is fixed to the tank bottom plate. The small stiffeners are arranged so as to be substantially perpendicular to the supporting members, and the horizontal spacing of the small stiffeners is equal to the horizontal distance of the supporting members. A vertical cylindrical marine tank support structure characterized by being formed narrower than the spacing.