JPH10273195A - Method and device for air-raising roof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and device for air-raising a roof in which when it is necessary to lower a roof during the time when the roof is being air-raised, the roof can be lowered smoothly. SOLUTION: In the method for air-raising a roof, a roof 1 is assembled on a bottom surface 2 and a seal is formed between the roof 1 and tank side walls 4a, 4b using a seal material 3 and then air is blown into under the roof 1 to raise the roof 1 upward along the walls 4a, 4b. In this case, while the air pressure under the air-raised roof 1 is being lowered gradually, wires fixed to a plurality of points at the lower end of the seal material 3 are drawn to pull down the lower end of the material 3 by means of a wire drawing means 16 so that the roof 1 is lowered, while the seal material 3 is prevented from being caught into between the roof and walls.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roof air-raising method and an apparatus for raising a large-sized roof such as a tank for storing LPG, LNG and the like from a tank bottom to a tank upper along a tank side wall.

[0002]

2. Description of the Related Art As a technique for installing a large roof such as a tank above a tank, for example, Japanese Utility Model Application Laid-Open No.
In the official gazette, after assembling the roof at the bottom of the tank, seal the space between the roof and the tank side wall with a sealing material, blow air under the roof with a blower, lift the roof by air pressure and rise to the top of the tank Roof air-raising is described.

FIG. 2 is an explanatory view showing a sealing state in a conventional roof air lazing, and FIG. 3 is an explanatory view showing a conventional roof air lazing method.

In FIG. 2, a roof 1 is connected to a bottom 2 in a tank.
After assembling, the sealing material 3
To seal between the roof 1 and the tank side wall 4.

In FIG. 3, when the roof 1 is air-raised, air is blown from the outside of the tank side wall 4 below the roof 1 by a blower 10 to lift the roof 1 by air pressure, and the tank 1 Raise to the top,
After that, the roof 1 is fixed to the upper part of the tank side wall 4.

[0006]

In the conventional roof air-raising, when the air-raising is started, the operation of stopping the air-raising halfway and lowering the roof is performed due to the structure of the seal between the roof and the tank side wall. Absent.

FIG. 4 is an explanatory view of the entrapment of the sealing material that occurs when the roof is lowered.
Since there is a frictional force between the sealing member 3 pressed against the tank side wall 4 and the tank side wall 4, the sealing member 3 does not move smoothly downward, and the upper portion of the sealing member 3 is caught in the downward direction and the roof 1 Does not descend smoothly or cannot descend.

However, when it is desirable to lower the roof that has been raised by air-raising, for example, when it is desired to lower the roof when an abnormality occurs in the blower or when a sudden strong wind is generated, the conventional air-conditioning system can be used. Raging does not allow the roof to descend smoothly due to the structure of the seal between the roof and the tank sidewall.

SUMMARY OF THE INVENTION The present invention provides a roof air-raising method and a roof air-raising method capable of smoothly lowering a roof when it becomes necessary to lower the roof during air-raising.

[0010]

The roof is assembled at the bottom in the tank, the space between the roof and the tank side wall is sealed with a sealing material by a sealing material, and air is blown under the roof to move the roof along the tank side wall. In the roof air-raising method of raising to the upper part of the tank, the air fixed under the aerated roof is gradually lowered, and the wire fixed at a plurality of locations at the lower end of the seal material is moved downward by the wire pulling means. It is characterized in that the roof is lowered while being pulled to prevent the sealing material from being involved.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a partial sectional view of a roof air-raising apparatus for carrying out a roof air-raising method according to the present invention.

Referring to FIG. 1, the roof 1 is assembled at the bottom 2 in the tank, and a sealing material 3 such as a vinyl seal is attached to the outer peripheral edge of the roof 1 so that the roof 1 and the side wall 4 of the tank are assembled. Seal between

In the present invention, one end of the wire 11 is fixed to the lower end of the sealing material 3, and a roller 12 for hanging the wire 11 downward near the outer peripheral edge is disposed on the lower surface side of the roof 1. The arrangement level of the rollers is such that when the wire 11 is pulled in the direction of the arrow shown in FIG. 1, the wire 11 fixed to the lower end of the sealing material 3 can be pulled downward to pull the sealing material 3 downward. I do. The wires 11 are provided at a plurality of positions, and the number is appropriately selected according to the size of the tank.

The wire 11 hung on the roller 12 is turned substantially vertically upward by the intermediate roller 13 and passes through a through hole 14 formed through the roof 1 to provide a gantry provided above the outer tank side wall 4b. The direction is changed by a roller 15 installed at 14, and the wire is wound around a winch 16 which is a wire pulling means 16.

Next, a roof air-raising using the roof air-raising apparatus of the present invention will be described with reference to FIGS.

As described in the prior art, the blower 10
Air is blown from the outside of the tank side wall 4 below the roof 1 to lift the roof 1 by air pressure, and the guide wire 5
As a result, the roof 1 is maintained in a horizontal state, and is raised to the upper portion of the tank along the tank side wall 4. In this case, the wire fixed to the sealing material may follow the rise of the roof and unwind the wire 11 from the winch 16. Then roof 1
Is fixed to the upper part of the tank side wall 4.

Next, when it becomes necessary to descend the aerated roof 1, the winch 16 winds the wire 11 to make it full, and while gradually lowering the air pressure under the roof, the winch is descended as the roof 1 descends. By winding the wire 11 at 16 and pulling the sealing material 3 downward, the roof 1 is lowered while preventing the wire 11 from being caught.

[0018]

According to the present invention, the sealing material can be prevented from being caught during the descent of the roof, so that when the roof needs to be lowered during the air-raising, the roof can be lowered smoothly.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view of a roof air-raising apparatus for performing a roof air-raising method of the present invention.

FIG. 2 is an explanatory view of a sealing state in a conventional roof air lasing.

FIG. 3 is an explanatory view showing a conventional roof air-raising method.

FIG. 4 is an explanatory diagram of entrapment of a sealing material generated when the roof is lowered.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Roof 2 Bottom part 3 Seal material 4 Tank side wall 4a Inner tank side wall 4b Outer tank side wall 10 Blower 11 Wire 12 Roller 13 Intermediate roll 14 Stand 15 Roller 16 Wire pulling means (winch)

Claims (2)

[Claims] Claims 1. A roof is assembled at the bottom in a tank, a gap between the roof and the side wall of the tank is sealed with a sealing material by a sealing material, and air is blown under the roof to move the roof along the side wall of the tank to an upper portion of the tank. A roof air-raising method in which the roof air is lifted while gradually lowering the air pressure under the aerated roof, pulling the lower end of the sealing material downward to prevent the sealing material from being involved, and thereby lowering the roof. Raging method. 2. A seal is provided between the roof and the tank side wall with a sealing material provided on the entire periphery of the roof assembled at the bottom in the tank, and air is blown under the roof to move the roof along the tank side wall. A roof air-raising apparatus, comprising: wires fixed at a plurality of locations at a lower end of a sealing material; and wire pulling means for pulling the wires downward.