JP2000249295A - Tank construction method - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a tank construction method capable of greatly shortening the construction period on site and securing land easily. SOLUTION: A storage tank main body 3 equipped with a hollow part 2 for functioning as a floating body in a part of the structure is built in an appropriate building facility, and the storage tank main body 3 is placed on the sea by the buoyancy of air sealed in the hollow part 2. Floating and towing to a predetermined stationary position, the cavity 2 is released to the atmosphere immediately above the stationary position and the buoyancy disappears, causing the storage tank main body 3 to sink, thereby lowering the storage tank main body 3 to the seabed 15 at the stationary position. Foundation 18 previously installed
After the seat 2 is seated and fixed thereon, and then pressurized air is introduced into the cavity 2 to discharge seawater, concrete is poured into the vacant cavity 2 and the cavity 2 is strengthened. To complete.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a tank construction method.

[0002]

2. Description of the Related Art Generally, when constructing a large tank for storing LPG, LNG, etc., civil engineering work on site and
Construction work for assembling parts manufactured at the factory on site is required, and a long construction period is required from the start of construction to completion.

[0003] In constructing a large tank, not only is it necessary to secure a construction site for the tank itself,
A work site must be secured around it.

[0004]

However, if the construction period is long, the road facilities need to be reinforced or temporarily installed for the traffic of construction vehicles, and the surrounding environment such as noise problems and traffic congestion may be reduced. There is also the problem that the effect of the water is prolonged, and the shortage of land near the coastline where the liquid can be easily received from the transport ship has become serious.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide a tank construction method capable of greatly shortening the construction period on site and easily securing land. .

[0006]

According to the present invention, a storage tank body provided with a hollow portion for functioning as a floating body in a part of the structure is constructed in an appropriate building facility, and the storage tank body is sealed in the hollow portion. Floated on the sea by the buoyancy of the vessel and towed to a predetermined stationary position, the cavities were released to the atmosphere immediately above the stationary position, and the buoyancy disappeared, causing the storage tank body to settle. After being seated and fixed on a foundation previously set in the cavity, and then pressurized air is introduced into the cavity to discharge the seawater, concrete is poured into the vacated cavity and the concrete is poured into the cavity. As a strength member.

[0007] Thus, if tank construction is performed in this way,
The on-site work is completed simply by constructing the storage tank body at an appropriate building facility different from the planned construction site, and then towing the storage tank body to the predetermined installation position and sitting on the foundation
The construction period at the site will be greatly shortened, reinforcement and temporary construction of road facilities for construction vehicles will be almost unnecessary, and the impact on the surrounding environment such as noise problems and traffic congestion will be minimized and It can be limited to a short period.

Further, since the storage tank body is installed on the seabed near the shoreline where the liquid can be easily received from the transport ship, there is no need to secure land on land and the problem of shortage of land can be solved. Become.

In the present invention, it is preferable that the hollow portion is provided around the outer periphery forming the body portion of the storage tank main body and completed as a concrete side wall by casting concrete. In this case, the hollow portion is formed as a floating body. It is relatively easy to get enough buoyancy to make it work,
In addition, by completing the concrete side wall, it is possible to effectively use it as a strength member having a breakwater function.

Further, as a construction facility for constructing the storage tank body, it is preferable to use shipbuilding docks existing in many parts of Japan, and in this case, large shipbuilding heavy equipment and the like are used. Thus, a large-capacity storage tank body can be easily constructed without any particular difficulty, and the work of floating on the sea after construction can be easily performed in the same manner as a ship.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 to 6 show an embodiment of the present invention. In this embodiment, as shown in FIG. 1, the structure of a dock 1 for shipbuilding is different from the construction site. A storage tank main body 3 equipped with a cavity 2 for partially functioning as a floating body is constructed.

The storage tank body 3 shown in the figure has a cylindrical concrete wall 4 standing upright to form a body, a cooling layer 5 made of granular perlite laid on the outer peripheral surface of the concrete side wall 4, and a tank bottom. The concrete structure 8 is mainly composed of a concrete base 6 forming a concrete base plate and a chilled layer 7 made of perlite concrete laid on the upper surface of the concrete base 6. A dome-shaped roof member 9 is installed so that the upper part of the storage space 10 is closed.

Further, the upper surface of the cold insulation layer 7 and the inner peripheral surface of the concrete side wall 4 at the bottom of the tank in the concrete frame 8,
A cooling material 11 made of urethane or the like is lined with the inner surface of the roof member 9 over the entire area. In particular, the cooling material 11 lining the upper surface of the cooling layer 7 at the bottom of the tank and the inner peripheral surface of the concrete side wall 4 is further provided. The inside is covered with a membrane 12 which is a sealing member for achieving liquid tightness of the storage space.

The hollow part 2 functioning as a floating body is
It is provided further around the concrete side wall 4 and the cold insulation layer 5 of the concrete skeleton 8, and more specifically,
A concrete side wall plate 14 is spaced apart from a metal frame plate 13 forming a skin of the concrete frame 8 by a required distance.
The concrete side wall panel 14 and the skeleton panel panel 13
The cavity 2 whose upper end is closed by the concrete side wall panel 14 and whose lower end is open is formed in a cylindrical shape.

Here, the storage tank body 3 is constructed by mounting it on a work table or the like, the lower end of the concrete side wall outer plate 14 is expanded in a skirt shape, and the lower part of the concrete body 8 is positioned below the lower end. So that it extends to

After the construction of the storage tank body 3 is completed, water is injected into the dock in the same manner as in the case of an ordinary ship, and as shown in FIG. The ship floats on the sea by buoyancy and is towed to a predetermined stationary position using a tugboat (not shown) or the like.

Here, a concrete annular base frame 16 having an outer diameter substantially equal to the outer diameter of the lower surface of the concrete frame 8 is submerged and installed on the seabed 15 at the stationary position, and a crushed stone 17 for level adjustment is placed inside the annular base frame 16. Is pre-installed.

It is to be noted that at least a place where the annular foundation frame 16 is installed, the seabed 15 is leveled, and the annular foundation frame 16 is provided.
Is considered to be installed with good levelness, and the level inside is adjusted by appropriately increasing or decreasing the amount of crushed stones 17.

Then, as shown in FIG. 3, an air vent (not shown) at the upper end of the cavity 2 is opened just above the installation position to open the cavity 2 to the atmosphere, and the buoyancy is lost to lower the tank main body 3. Thereby, the lower part of the storage tank main body 3 is seated on the foundation 18 on the seabed 15 at the stationary position and fixed by an appropriate anchor means.

Next, after pressurized air is introduced into the cavity 2 to discharge seawater, as shown in FIG. 4 and FIG. A long plate-shaped concrete outflow prevention steel plate 20 extending in the vertical direction is inserted from above into the U-shaped holder 19 provided at the upper and lower two-stages, and dropped.
0, the gap between the lower end of the concrete side wall outer plate 14 and the seabed 15 is closed in accordance with the uneven shape of the seabed 15, and then concrete is poured into the empty cavity 2 as shown in FIG. And the hollow portion 2 is connected to the concrete side wall 21.
(Strength member).

Thus, if tank construction is performed in this way,
The on-site work is completed only by constructing the storage tank main body 3 at the dock for shipbuilding 1 different from the construction site and then towing the storage tank main body 3 to a predetermined stationary position and sitting on the foundation 18. The construction period will be greatly shortened, and the reinforcement and temporary construction of road facilities for construction vehicles will be almost unnecessary, and the impact on the surrounding environment such as noise problems and traffic congestion will be minimized and short-term. It is possible to limit to between.

Further, since the storage tank main body 3 is installed on the seabed 15 near the shoreline where the liquid can be easily received from the transport ship, it is not necessary to secure land on land and the problem of land shortage can be solved. It becomes possible.

In this embodiment, the cavity 2 is provided around the outer periphery of the body of the storage tank body 3 and is completed as a concrete side wall 21 by casting concrete. It is possible to relatively easily obtain a buoyancy sufficient to function as a concrete wall, and by completing the concrete side wall 21, it is possible to effectively use it as a strength member having a breakwater function.

Further, as the construction facility for constructing the storage tank main body 3, the shipbuilding dock 1 existing in many parts of Japan is used, so that a large capacity shipbuilding equipment can be used. It is possible to easily construct the storage tank body 3 without any particular difficulty, and the work of floating on the sea after the construction can be easily performed in the same manner as in the case of a ship.

It should be noted that the tank construction method of the present invention is not limited to only the above-described embodiment, and that the hollow portion may be provided in a part of the structure of the storage tank main body. It goes without saying that various changes can be made without departing from the spirit of the invention.

[0027]

According to the tank construction method of the present invention described above, various excellent effects as described below can be obtained.

(I) According to the first aspect of the present invention, the construction period at the site can be greatly shortened, so that the reinforcement and temporary installation of the road facilities for the construction vehicle are required to a minimum. The impact on the surrounding environment, such as noise problems and traffic congestion, can be minimized and limited to a short period of time.Furthermore, the storage tank body is located on the seabed near the coastline where it is easy to receive liquid from transport vessels. The problem of shortage of land can be solved by installing.

(II) According to the second aspect of the present invention, it is possible to relatively easily obtain a buoyancy sufficient to make the hollow portion function as a floating body, and to complete the concrete side wall. It can be effectively used as a strength member having a breakwater function.

(III) According to the third aspect of the present invention, a large-capacity storage tank main body can be easily constructed without particular difficulty using a large-scale heavy equipment for shipbuilding. The work of floating on the sea after construction can be easily performed in the same manner as in the case of a ship.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a state in which a storage tank main body is being built with a shipbuilding dock in an example of an embodiment of the present invention.

FIG. 2 is a schematic diagram showing a state where the storage tank main body of FIG. 1 is floating on the sea and towed.

FIG. 3 is a schematic view showing a state where the storage tank main body of FIG. 2 is settled and seated on a foundation.

FIG. 4 is an enlarged sectional view showing a state in which a gap between the lower end of the concrete side wall outer plate and the seabed in FIG. 3 is closed with a steel plate.

FIG. 5 is a perspective view showing details of a steel plate shown in FIG. 4;

FIG. 6 is a schematic view showing a state where concrete is poured into the hollow portion of FIG. 4 to complete a concrete side wall.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Dock for submarine shipbuilding (building facility) 2 Cavity part 3 Storage tank body 15 Submarine floor 16 Ring foundation frame 18 Foundation 21 Concrete side wall (strength member)

Claims (3)

[Claims] Claims: 1. A storage tank body equipped with a hollow part for functioning as a floating body in a part of the structure is built in an appropriate building facility,
The storage tank body floats on the sea by the buoyancy of the air sealed in the cavity and is towed to a predetermined stationary position, the cavity is released to the atmosphere immediately above the stationary position, the buoyancy disappears, and the storage tank body is settled, With this, the lower part of the tank body is seated and fixed on the foundation previously set on the seabed at the stationary position,
Next, pressurized air is introduced into the cavity to discharge seawater, and then concrete is poured into the empty cavity to complete the cavity as a strength member. 2. The tank construction method according to claim 1, wherein a hollow portion is provided around an outer periphery forming a body portion of the storage tank main body and completed as a concrete side wall by casting concrete. 3. The tank construction method according to claim 1, wherein the construction facility for constructing the storage tank body is a dock for shipbuilding.